WO2017104268A1 - 斜視対物光学系及びそれを備えた斜視用内視鏡 - Google Patents
斜視対物光学系及びそれを備えた斜視用内視鏡 Download PDFInfo
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- WO2017104268A1 WO2017104268A1 PCT/JP2016/081574 JP2016081574W WO2017104268A1 WO 2017104268 A1 WO2017104268 A1 WO 2017104268A1 JP 2016081574 W JP2016081574 W JP 2016081574W WO 2017104268 A1 WO2017104268 A1 WO 2017104268A1
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- optical system
- objective optical
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- refractive power
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
- G02B23/2407—Optical details
- G02B23/2423—Optical details of the distal end
- G02B23/243—Objectives for endoscopes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/00064—Constructional details of the endoscope body
- A61B1/00071—Insertion part of the endoscope body
- A61B1/0008—Insertion part of the endoscope body characterised by distal tip features
- A61B1/00096—Optical elements
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/00163—Optical arrangements
- A61B1/00174—Optical arrangements characterised by the viewing angles
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/00163—Optical arrangements
- A61B1/00174—Optical arrangements characterised by the viewing angles
- A61B1/00177—Optical arrangements characterised by the viewing angles for 90 degrees side-viewing
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/00163—Optical arrangements
- A61B1/00174—Optical arrangements characterised by the viewing angles
- A61B1/00179—Optical arrangements characterised by the viewing angles for off-axis viewing
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/00163—Optical arrangements
- A61B1/00188—Optical arrangements with focusing or zooming features
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
- G02B23/2407—Optical details
- G02B23/2461—Illumination
- G02B23/2469—Illumination using optical fibres
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
- G02B23/26—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes using light guides
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/555—Constructional details for picking-up images in sites, inaccessible due to their dimensions or hazardous conditions, e.g. endoscopes or borescopes
Definitions
- the present invention relates to a perspective objective optical system including an optical path conversion element and a perspective endoscope including the same.
- image sensors such as CCD (Charge Coupled Devices) and C-MOS (Complementary Metal Oxide Semiconductor)
- pixel miniaturization and element miniaturization are progressing due to progress in miniaturization technology.
- an image sensor having very fine pixels for example, an image sensor having a pixel pitch of about 1 to 2 ⁇ m has been manufactured.
- recent image pickup devices have become more compact with more pixels than before.
- the lens outer diameter or the overall length of the objective optical system is reduced, it becomes difficult to make the light beam emitted from the objective optical system incident perpendicularly to the light receiving surface of the image sensor.
- the light beam is incident obliquely on the light receiving surface (hereinafter referred to as oblique incidence).
- recent imaging devices such as CCDs and C-MOSs are designed on the assumption that the optimum light beam incident on the light receiving surface is oblique incidence.
- recent image sensors have oblique incidence characteristics.
- a high-performance optical system is, for example, an optical system with high resolution and good aberration correction.
- an optical system used for an image sensor with a small pixel pitch must be an optical system with a small F number.
- the diameter of the light beam passing through the optical system increases. For this reason, if the F-number is reduced, it becomes difficult to correct aberrations satisfactorily.
- each aberration In an optical system used for an image sensor with a small pixel pitch, each aberration must be corrected so that the amount of each aberration is very small as the pixel pitch is narrowed.
- the amount of aberration In terms of the amount of lateral aberration, the amount of aberration must be several times the pixel pitch, that is, about several ⁇ m, or at most 10 ⁇ m.
- the number of lenses of the optical system increases. However, if the number of lenses is increased, the total length of the optical system becomes longer. Further, when the total length of the optical system is increased, the height of the light beam that passes through the lens also increases, so that the outer diameter of the lens also increases. Endoscopes require a small optical system. Therefore, the objective optical system must be configured so that the size applicable to the endoscope and high imaging performance are ensured while suppressing an increase in the number of lenses as much as possible.
- perspective objective optical system as one of the objective optical systems for endoscopes.
- forward view, side view, or backward view is performed.
- FIG. 1 is an example of a conventional perspective objective optical system.
- the perspective objective optical system 1 is a perspective objective optical system that performs a side view.
- the oblique objective optical system 1 includes a front lens group 2, a prism 3 and a rear lens group 4.
- the optical axis of the front lens group 2 and the optical axis of the rear lens group 4 are orthogonal to each other by the prism 3.
- FIG. 2 is another example of a conventional perspective objective optical system.
- the perspective objective optical system 5 is a perspective objective optical system that performs forward viewing.
- the oblique objective optical system 5 includes a front lens group 6, a prism 7 and a rear lens group 8. In the oblique objective optical system 5, the optical axis of the front lens group 6 and the optical axis of the rear lens group 8 are crossed by the prism 7.
- an optical path conversion element having a large glass path length is arranged in the optical system. For this reason, particularly in a perspective objective optical system, a large space for arranging an optical path conversion element such as a prism is required. As a result, in the perspective objective optical system, the total length of the optical system is longer than that of the direct-view objective optical system. Thus, since the perspective objective optical system tends to be larger than the direct-view objective optical system, the perspective objective optical system is required to be further downsized.
- Patent Documents 1 to 3 disclose a perspective objective optical system.
- Patent Documents 4 to 9 disclose a direct-view objective optical system.
- Patent Document 1 discloses a perspective objective optical system and a direct-view objective optical system.
- the oblique objective optical system includes a front group diverging lens system composed of a negative single lens, a rear group converging lens system, and a prism disposed therebetween.
- a prism is not disposed in the direct-view objective optical system. Therefore, in the direct-view objective optical system, the front group diverging lens system and the rear group converging lens system are arranged in a separated state (a state where the lens interval is wide).
- these objective optical systems are optical systems premised on being used for image fibers. Therefore, in these objective optical systems, a light beam emitted from the objective optical system can be incident substantially perpendicular to the incident end face of the fiber.
- the perspective objective optical system disclosed in Patent Document 2 includes a first lens group composed of one negative lens, a prism as a reflecting member, and a second lens group having a positive refractive power.
- a glass material having a small dispersion (a glass material having a large Abbe number) is used for the negative lens and the prism of the first lens group in order to correct chromatic aberration.
- the perspective objective optical system disclosed in Patent Document 3 includes a front lens group having a positive refractive power, a prism of a field direction changing element, and a rear lens group having a positive refractive power.
- the front lens group includes a negative lens and a positive lens.
- the rear lens group includes a cemented lens.
- the objective optical system disclosed in Patent Document 4 is a direct-view objective optical system.
- the direct-view objective optical system includes a first lens group having a negative refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power. , Is composed of.
- the objective optical system disclosed in Patent Document 5 is a direct-view objective optical system.
- This direct-view objective optical system includes a first group of negative lenses, a second group of positive single lenses, and a rear group.
- the rear group includes a positive single lens and a cemented lens of a positive lens and a negative lens.
- the objective optical system disclosed in Patent Document 6 is a direct-view objective optical system, and includes a negative lens, a positive meniscus lens or a cemented lens having a positive refractive power, a positive lens, and a cemented lens.
- the objective optical system disclosed in Patent Document 7 is a direct-view objective optical system.
- This direct-view objective optical system includes a front group having a negative refractive power and a rear group having a positive refractive power.
- the front group includes a negative lens and a lens group having a weak refractive power.
- the rear group includes a positive lens and a cemented lens.
- this objective optical system is a direct-view objective optical system.
- This direct-view objective optical system includes a front group diverging lens system composed of two negative lenses and a rear group converging lens.
- this objective optical system is a direct-view objective optical system.
- This direct-view objective optical system includes a negative first lens, a positive cemented lens in which a second lens and a third lens are cemented, a positive fourth lens, a positive fifth lens, and a negative sixth lens. And a positive cemented lens.
- JP 51-62053 A Japanese Patent No. 3385090 Japanese Patent No. 5558058 JP-A-10-111454 Japanese Patent No. 3359092 International Publication No. 2012/008312 Japanese Patent No. 4556382 JP-A-10-260348 Japanese Patent No. 4265909
- the perspective objective optical system disclosed in Patent Document 1 has a large optical system as a whole. Further, although the F number of the optical system is small, the amount of aberration such as chromatic aberration is quite large. Therefore, the optical performance is insufficient for use in an image sensor with a small pixel pitch. Further, the direct-view objective optical system does not have a sufficient lens interval for arranging the prism. Also, this direct-view objective optical system lacks optical performance as in the case of the perspective objective optical system.
- the perspective objective optical system and the direct-view objective optical system disclosed in Patent Document 1 can be applied to an imaging element such as a multi-pixel and small CCD, that is, for high performance and miniaturization. It cannot be applied to a corresponding perspective objective optical system.
- a glass material having a low refractive index is used for each of the negative lens and the prism of the first lens group in order to correct chromatic aberration. Therefore, the air-converted length on the object side is particularly longer than the aperture stop. As a result, the outer diameter of the negative lens and the outer diameter of the prism are increased. Furthermore, since the F number is large, the optical performance is insufficient for use in an image sensor with a small pixel pitch.
- the optical system is configured as described above, thereby reducing the outer diameter of the front and rear lenses and shortening the overall length.
- this objective optical system has a large F number. Therefore, when the F number is decreased, the beam diameter is increased, and the amount of aberration generated is significantly increased. As a result, the optical performance is degraded. Thus, the optical performance is insufficient for use in an image sensor with a small pixel pitch.
- the objective optical system disclosed in Patent Document 4 is a direct-view objective optical system.
- this objective optical system since the lens interval between the second lens group and the third lens group is large, a prism can be arranged.
- the F number is also small.
- the optical performance is not sufficient because the amount of aberration is large. Therefore, optical performance is insufficient for use in an image sensor with a small pixel pitch.
- the lens outer diameter of the lens group located on the object side is large. Therefore, if the prism is arranged, the optical system becomes large. In particular, miniaturization is required for an objective optical system for an endoscope. Therefore, if a prism is arranged in the optical system, the optical system becomes unsuitable as an objective optical system for an endoscope.
- Patent Document 4 cannot be applied to a perspective objective optical system corresponding to high performance and miniaturization.
- the objective optical system disclosed in Patent Document 5 does not have a space for arranging a prism in the optical system. Also, since the F number is large and the amount of aberration is large, the optical performance is not sufficient. That is, the optical performance is insufficient for use in an image sensor with a small pixel pitch.
- the objective optical system disclosed in Patent Document 6 does not have a space for arranging a prism in the optical system. Also, since the F number is large and the amount of aberration is large, the optical performance is not sufficient. That is, the optical performance is insufficient for use in an image sensor with a small pixel pitch.
- Patent Document 6 cannot be applied to a perspective objective optical system corresponding to high performance and miniaturization.
- the objective optical system disclosed in Patent Document 7 does not have a space for arranging a prism in the optical system. Further, although the F number is small, the optical performance is not sufficient because of the large amount of aberration. That is, the optical performance is insufficient for use in an image sensor with a small pixel pitch.
- Patent Document 7 cannot be applied to a perspective objective optical system corresponding to high performance and miniaturization.
- the objective optical system disclosed in Patent Document 8 does not have a space for arranging the prism in the optical system. Also, since the F number is large and the amount of aberration is large, the optical performance is not sufficient. That is, the optical performance is insufficient for use in an image sensor with a small pixel pitch.
- the optical path conversion prism is provided on the image plane side, the lens length arranged in front of the prism is very long. Therefore, when this direct-view objective optical system is used as a perspective objective optical system, the outer diameter of the scope such as a front perspective view and a rear perspective view becomes large.
- Patent Document 8 cannot be applied to a perspective objective optical system corresponding to high performance and miniaturization.
- the objective optical system disclosed in Patent Document 9 does not have a space for arranging a prism in the optical system. Also, since the F number is large and the amount of aberration is large, the optical performance is not sufficient. That is, the optical performance is insufficient for use in an image sensor with a small pixel pitch.
- the optical path conversion prism is provided on the image plane side, the lens length arranged in front of the prism is very long. Therefore, when this direct-view objective optical system is used as a perspective objective optical system, the scope outer diameter such as a front perspective view and a rear perspective view becomes thick.
- Patent Document 9 cannot be applied to a perspective objective optical system corresponding to high performance and miniaturization.
- the present invention has been made in view of such problems, and an object thereof is to provide a high-performance and compact perspective objective optical system.
- the present invention provides a perspective endoscope having a high-quality image and having a thinned tip.
- the perspective objective optical system of the present invention includes: In order from the object side, the front lens group having a negative refractive power, an optical path conversion element, an aperture stop, and a rear lens group having a positive refractive power,
- the front lens group includes a first lens and a second lens
- the rear lens group includes a third lens and a cemented lens having a positive refractive power
- the first lens is a negative lens having a concave surface on the image plane side
- the second lens is a single lens or a cemented lens with a convex surface facing the image surface side
- the third lens consists of a positive lens
- the cemented lens is composed of a positive lens composed of a biconvex lens and a meniscus negative lens, The following conditional expressions (1) to (3) are satisfied.
- D1 is the air equivalent length from the image side surface of the lens located closest to the image plane side of the front lens group to the aperture stop
- D2 is the air equivalent length from the image side surface to the image surface of the final lens in the rear lens group
- L is the total length of the perspective objective optical system
- f is the focal length of the entire oblique objective optical system
- the perspective endoscope of the present invention is characterized by including the above-described perspective objective optical system.
- a high-performance and compact perspective objective optical system can be realized.
- FIG. 6 is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 1 and aberration diagrams.
- FIG. 6 is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 2 and aberration diagrams.
- FIG. 6 is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 3 and aberration diagrams.
- FIG. 7A is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 4, and FIG. FIG. 10 is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 5 and aberration diagrams.
- FIG. 10 is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 6 and aberration diagrams.
- FIG. 9A is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 7 and FIG.
- FIG. 10A is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 8 and FIG.
- FIG. 10A is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 9, and FIG. FIG.
- FIG. 10A is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 10
- FIG. FIG. 12A is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 11
- FIG. FIG. 14A is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 12
- FIG. FIG. 14A is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 13
- FIG. 18A is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 14
- FIG. 18A is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 15, and FIG. FIG.
- FIG. 18A is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 16, and FIG. FIG. 18A is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 17, and FIG. FIG. 18A is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 18, and FIG. FIG. 19A is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 19 and its aberration diagram.
- FIG. 20A is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 20
- FIG. FIG. 18A is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 21, and FIG. FIG.
- FIG. 22A is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 22, and FIG. FIG. 22A is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 23, and FIG. FIG. 22A is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 24, and FIG. FIG. 18A is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 25, and FIG. FIG. 22A is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 26, and FIG. FIG. 18A is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 27, and FIG. FIG.
- FIG. 22A is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 28, and FIG. FIG. 22A is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 29, and FIG. FIG. 10A is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 30, and FIG. FIG. 6A is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 31, and FIG. FIG. 22A is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 32, and FIG. FIG. 18A is a diagram illustrating a cross-sectional configuration of a perspective objective optical system according to Example 33, and FIG. It is a figure which shows the structure of an endoscope apparatus.
- the perspective objective optical system of the present embodiment includes, in order from the object side, a front lens group having a negative refractive power, an optical path conversion element, an aperture stop, and a rear lens group having a positive refractive power.
- the front lens group is composed of a first lens and a second lens
- the rear lens group is composed of a third lens and a cemented lens having a positive refractive power
- the first lens is an image plane.
- the second lens is a single lens or a cemented lens with a convex surface facing the image surface side
- the third lens is a positive lens
- the cemented lens is a biconvex lens.
- a meniscus negative lens is a single lens or a cemented lens with a convex surface facing the image surface side
- the optical path conversion element By arranging the optical path conversion element in the vicinity of the aperture stop, that is, on the object side of the brightness stop or the image side of the aperture stop, the light beam height in the optical path conversion element can be kept low. As a result, the size of the optical path conversion element can be reduced.
- the distance from the aperture stop to the image plane is at least longer than the glass path length of the optical path conversion element. If it does so, the light ray radiate
- Focus adjustment is performed when assembling the perspective objective optical system. For this reason, if an attempt is made to satisfy the oblique incident characteristics of the image sensor, the interval necessary for focus adjustment is insufficient. Further, since the light beam is forcibly bent in accordance with the oblique incidence characteristic, an aberration occurs. As a result, the optical performance is significantly deteriorated. “Focus adjustment” in the following description means focus adjustment at the time of assembly.
- the optical path conversion element is arranged on the object side of the aperture stop. Therefore, since the distance from the aperture stop to the image plane can be shortened, it is relatively easy to set the angle of the light beam emitted from the oblique objective optical system to an angle that satisfies the oblique incidence characteristics of the image sensor.
- the various optical elements are optical elements other than lenses and optical path conversion elements.
- the various optical elements are, for example, an infrared cut filter, a color temperature conversion filter, a laser cut filter, and a cover glass provided on the image sensor.
- an optical path conversion element is disposed on the object side of the aperture stop, and the distance from the aperture stop to the image plane is prevented from becoming too short. Therefore, various optical elements can be disposed on the image plane side of the aperture stop. Thereby, a lens, an optical path conversion element, and various optical elements can be arranged with good balance on both sides of the aperture stop. As a result, an increase in the size of the objective optical system can be suppressed.
- the F number of the optical system must be small.
- the aperture of the objective optical system increases.
- aberrations related to the size of the aperture of the optical system particularly spherical aberration and coma aberration, increase.
- the imaging performance of the optical system is significantly degraded.
- the optical system must be a high-performance optical system for use in an image sensor with a small pixel pitch. Therefore, it is necessary to correct spherical aberration, coma aberration, chromatic aberration, and the like so that the amount of each aberration is reduced.
- the objective optical system for an endoscope is an optical system that is small, has a wide angle of view, and has a long back focus compared to the focal length. For this reason, an endoscope objective optical system often employs a retrofocus type configuration.
- the refractive power array has a negative refractive power and a positive refractive power in order from the object side.
- the aberration balance is made to be the same as the aberration balance before increasing the negative refractive power on the object side.
- a lens is arranged on the image plane side near the negative lens. In this way, even if aberration occurs by increasing the negative refractive power on the object side, the influence of the aberration can be reduced.
- a front lens group having negative refractive power is disposed on the object side of the aperture stop.
- the front lens group includes a first lens and a second lens.
- a rear lens group having a positive refractive power is disposed on the image plane side with respect to the aperture stop.
- the rear lens group includes a third lens and a cemented lens having a positive refractive power.
- the first lens is a negative lens and the third lens is a positive lens. Therefore, the retrofocus type configuration is realized by the first lens and the third lens.
- the first lens is located closest to the object side.
- the object side surface of the first lens is often a flat surface.
- the following (I) and (II) are the main reasons.
- (I) The probability of damage to the lens surface can be reduced.
- (II) Since it is difficult for water droplets to collect around the lens surface, the observation range is not narrowed.
- the first lens In an objective optical system for an endoscope, it is necessary to increase the angle of view in order to observe a wide range.
- the first lens needs to be constituted by a negative lens having a large refractive power.
- the image side surface of the second lens is a surface with a concave surface facing the image surface side.
- the image side surface of the second lens is a lens surface having a very large refractive power, that is, a lens surface having a small radius of curvature.
- the second lens is disposed in the vicinity of the image plane side of the first lens so as to face the first lens.
- the second lens is arranged with the convex surface facing the image plane side.
- the image side surface of the first lens is a lens surface with a concave surface facing the image surface side. Therefore, the second lens is disposed so as to face the image side surface of the first lens so that the convex surface faces the image surface side.
- at least one of the two lens surfaces is a convex lens surface. What is necessary is just to arrange
- the light beam can be bent in the direction opposite to the way the light beam is bent by the image side surface of the first lens.
- various aberrations can be corrected satisfactorily. Therefore, such a lens arrangement is effective for aberration correction.
- the first lens is arranged with the concave surface facing the image surface side, and the second lens is opposite to the concave surface, that is, the convex surface faces the image surface side.
- the aberration is favorably corrected by providing the lens surfaces each having an action of bending the light beam in the opposite direction.
- the cemented lens configured in the rear lens group includes a positive lens and a negative lens in order from the object side.
- a perspective objective optical system can be reduced in size.
- the angle of the light beam emitted from the oblique objective optical system can be set to an angle that satisfies the oblique incident characteristics of the image sensor.
- the cemented lens is composed of a negative lens and a positive lens in this order from the object side, the height of the light beam at the cemented lens increases, and the outer diameter of the lens increases. Therefore, the processability of the lens is deteriorated. Also, the outer diameter of the entire perspective objective optical system becomes large.
- the light beam emitted from the oblique objective optical system becomes almost perpendicular to the light receiving surface of the image sensor.
- Forcing the angle to satisfy the oblique incidence characteristic causes aberrations because the light rays are greatly bent at the cemented lens surface. Therefore, the optical performance is deteriorated.
- the perspective objective optical system of the present embodiment has the above-described configuration and satisfies the following conditional expressions (1) to (3).
- D1 is the air equivalent length from the image side surface of the lens located closest to the image plane side of the front lens group to the aperture stop
- D2 is the air equivalent length from the image side surface to the image surface of the final lens in the rear lens group
- L is the total length of the perspective objective optical system
- f is the focal length of the entire oblique objective optical system, It is.
- Conditional expressions (1), (2), and (3) are defined for the specific length of the perspective objective optical system. These conditional expressions are conditional expressions concerning the perspective objective optical system necessary for reducing the diameter and size of the endoscope tip (hereinafter referred to as “tip”).
- Conditional expression (1) is a conditional expression that defines the air-converted length from the image side surface of the lens located closest to the image plane side of the front lens group to the aperture stop.
- conditional expression (1) If the lower limit value of conditional expression (1) is not reached, it is difficult to secure a sufficient space for arranging the optical path conversion element having the optimum outer diameter shape. For this reason, the optical path conversion element causes light beam shifting. Moreover, there is a possibility that flare may occur in an image when light rays enter other than the optical surface of the optical path conversion element.
- the total length of the front lens group is shortened.
- the front lens group of the objective optical system is held by a jig.
- the portion held by the jig is reduced. For this reason, it becomes impossible to stably hold the optical system on the jig and it becomes difficult to perform assembly, focus adjustment, and the like with high accuracy. Furthermore, it becomes difficult to attach and fix the imaging system to the distal end portion of the endoscope with high accuracy.
- conditional expression (1) If the upper limit of conditional expression (1) is exceeded, a sufficient space for arranging the optical path conversion element can be secured, but the glass path length from the first lens to the aperture stop becomes too long. In this case, since the height of the light beam in the first lens is increased, the outer diameter of the first lens is increased. Along with this, the perspective objective optical system becomes larger. Furthermore, as the perspective objective optical system increases in size, the outer diameter of the endoscope on which it is mounted also increases.
- Conditional expression (2) is a conditional expression that defines the air-converted length from the image side surface to the image surface of the final lens in the rear lens group.
- the final lens means a lens having refractive power. Therefore, a parallel plate filter such as a color filter or a powerless lens is not the final lens.
- conditional expression (2) If the lower limit of conditional expression (2) is not reached, the distance from the final lens to the image plane becomes too narrow. In this case, since the distance between the imaging element and the perspective objective optical system becomes too narrow, sufficient focus adjustment cannot be performed when the perspective objective optical system is assembled.
- conditional expression (2) If the upper limit of conditional expression (2) is exceeded, the distance from the final lens to the image plane can be sufficiently secured, and focus adjustment can be performed. However, since the distance from the final lens to the image plane becomes too long, the objective optical system becomes large.
- the oblique objective optical system when attached to the distal end portion of the endoscope, the oblique objective optical system and the imaging device (hereinafter referred to as “imaging system”) are likely to interfere with other members. In order to avoid this interference, it is necessary to provide a clearance around the imaging system in the tip. If it does so, the whole front-end
- Conditional expression (3) is a conditional expression that defines the total length of the oblique objective optical system.
- Conditional expression (3) is a conditional expression for optimizing the overall length of the perspective objective optical system while achieving a balance between high performance and miniaturization of the optical system.
- conditional expression (3) If the upper limit value of conditional expression (3) is exceeded, a sufficient space for arranging the optical path conversion element and the lens can be secured. However, since the total length of the optical system becomes long, the height of light in the optical system becomes high. As a result, the lens outer diameter becomes large. As a result, the tip portion also becomes larger.
- the perspective objective optical system of the present embodiment preferably satisfies the following conditional expression (4).
- D1 is the air equivalent length from the image side surface of the lens located closest to the image plane side of the front lens group to the aperture stop
- D2 is the air equivalent length from the image side surface to the image surface of the final lens in the rear lens group, It is.
- Conditional expression (4) is the air conversion length from the image side surface of the lens located closest to the image plane side of the front lens unit to the aperture stop, and the air conversion from the image side surface of the final lens of the rear lens unit to the image plane. It is a conditional expression that defines the ratio of length.
- the air-converted length from the image side surface of the lens located closest to the image plane side of the front lens group to the aperture stop becomes too short. Therefore, it becomes impossible to arrange an optical path conversion element having an optimum outer diameter. Alternatively, the air-converted length from the image side surface to the image surface of the final lens in the rear lens group becomes too long. In this case, since the lens outer diameter of the rear lens group is particularly increased, the tip end portion is increased.
- conditional expression (4) If the upper limit value of conditional expression (4) is exceeded, the air conversion length from the image side surface of the lens located closest to the image plane side of the front lens group to the aperture stop becomes too long. In this case, since the lens outer diameter of the front lens group is increased, the tip portion is increased. Alternatively, the air-converted length from the image side surface to the image surface of the final lens in the rear lens group becomes too short. Therefore, it becomes impossible to dispose a lens necessary for aberration correction. In addition, since a sufficient interval for focus adjustment cannot be ensured, it is difficult to assemble the imaging system.
- the oblique objective optical system of the present embodiment preferably satisfies the following conditional expressions (5) and (6).
- fF is the focal length of the front lens group
- fR is the focal length of the rear lens group
- f is the focal length of the entire oblique objective optical system, It is.
- Conditional expression (5) is a conditional expression that defines the focal length of the front lens group.
- conditional expression (5) When the lower limit value of conditional expression (5) is not reached, the refractive power of the front lens unit increases, so the angle of view of the perspective objective optical system increases. As the angle of view increases, the height of the light beam in the front lens group increases, and the lens outer diameter increases. Furthermore, when the angle of view increases, the peripheral part of the observation image becomes dark. In order to brighten the peripheral portion of the image, it is necessary to further brighten the illumination light. In this case, the size of the illumination optical system is increased. Neither is preferred for reducing the diameter of the tip.
- the radius of curvature of the first lens is particularly small, it becomes difficult to process the lens. Furthermore, as the refractive power of the first lens increases, the aberration of the entire optical system deteriorates. In order to correct this aberration, it is necessary to increase the number of lenses constituting the front lens group. However, increasing the number of lenses increases the size of the optical system.
- the refractive power of the front lens group becomes small, so the angle of view of the perspective objective optical system becomes small. If an attempt is made to secure a large angle of view in this state, the distance from the first lens in the front lens group to the aperture stop becomes long. As a result, the height of the light beam from the first lens to the aperture stop becomes high, which increases the size of the front lens and the size of the entire optical system.
- Conditional expression (6) is a conditional expression that defines the focal length of the rear lens group.
- conditional expression (6) If the lower limit value of conditional expression (6) is not reached, the refractive power of the rear lens unit increases, and the image position becomes too close to the rear lens unit. As a result, the interval necessary for focus adjustment becomes narrow, and the interval necessary for focus adjustment is insufficient. For this reason, the depth on the far point side is shallower than the originally required depth.
- the refractive power of the rear lens group increases, the refractive power of each lens constituting the rear lens group also increases. In this case, since the radius of curvature of each lens becomes small, it becomes difficult to process the lens.
- conditional expression (6) If the upper limit value of conditional expression (6) is exceeded, the refractive power of the rear lens group becomes small, so that the image position is too far from the rear lens group. In this case, since the glass path length from the aperture stop to the image position becomes long, the entire optical system becomes large.
- the perspective objective optical system of the present embodiment preferably satisfies the following conditional expressions (7) and (8). 1.2 ⁇
- f1 is the focal length of the first lens
- f2 is the focal length of the second lens
- f is the focal length of the entire oblique objective optical system, It is.
- Conditional expression (7) is a conditional expression that defines the focal length of the first lens.
- the radius of curvature of the first lens becomes small, it becomes difficult to process the lens. Furthermore, since the refractive power of the first lens is increased, the optical performance is deteriorated particularly when the lens is decentered. As a result, it becomes difficult to realize a perspective objective optical system having stable optical performance.
- conditional expression (7) If the upper limit value of conditional expression (7) is exceeded, the refractive power of the first lens becomes small, so the angle of view of the perspective objective optical system becomes small. If a large angle of view is to be secured in this state, the distance from the first lens to the aperture stop becomes long. As a result, the height of the light beam from the first lens to the aperture stop becomes high, so that the first lens is enlarged and the entire optical system is enlarged. Therefore, exceeding the upper limit of conditional expression (7) is not preferable for reducing the diameter of the tip.
- Conditional expression (8) is a conditional expression that defines a ratio between the focal length of the first lens and the focal length of the second lens.
- conditional expression (8) If the lower limit value of conditional expression (8) is not reached, the refractive power of the second lens becomes small, making it difficult to correct aberrations by the second lens. In this case, since the generation of spherical aberration and coma cannot be suppressed, a high-performance optical system cannot be achieved.
- the refractive power of the first lens increases, the radius of curvature of the first lens decreases. In this case, it becomes difficult to process the first lens. Further, when the first lens is decentered, the optical performance is greatly deteriorated.
- the refractive power of the first lens becomes small, and the radius of curvature of the first lens becomes large. In this case, the angle of view of the optical system is reduced and the outer diameter of the first lens is increased. Furthermore, the entire optical system is increased in size.
- the second lens has a positive refractive power and satisfies the following conditional expression (7 ′). 1.2 ⁇
- f1 is the focal length of the first lens
- f is the focal length of the entire oblique objective optical system, It is.
- the front lens group has a negative refractive power. Therefore, the size of the angle of view of the optical system is determined by the refractive power of the front lens group.
- the front lens group is composed of a first lens and a second lens having negative refractive power. When the second lens has a positive refractive power, the size of the angle of view of the optical system is determined by the negative refractive power of the first lens.
- the first lens has a positive refractive power when the second lens has a positive refractive power. It is necessary to increase the negative refractive power of. In order to cope with further widening of the optical system, it is necessary to further increase the negative refractive power of the first lens.
- conditional expression (7 ′) when the second lens has positive refractive power, it is preferable to satisfy the conditional expression (7 ′).
- conditional expression (7 ′) By satisfying conditional expression (7 ′), a wide angle of view can be secured even when the second lens has a positive refractive power, and the positive refractive power of the second lens improves the aberration. Can be corrected.
- the second lens has a negative refractive power and satisfies the following conditional expression (7 ′′). 1.9 ⁇
- f1 is the focal length of the first lens
- f is the focal length of the entire oblique objective optical system, It is.
- the second lens Since the second lens has a negative refractive power, the first lens and the second lens can bear the negative refractive power necessary for the front lens group. Therefore, the negative refractive power of the first lens can be made smaller than when the second lens has no negative refractive power.
- the second lens has a negative refractive power
- the second lens is negative. Even if it has a refractive power, a wide angle of view can be secured.
- the negative refractive power of the first lens can be reduced compared to the case where the front lens group is composed of a single negative lens, so that the occurrence of aberration can be suppressed.
- the second lens has a positive refractive power and satisfies the following conditional expression (8 ′). 0.02 ⁇
- f1 is the focal length of the first lens
- f2 is the focal length of the second lens, It is.
- Conditional expression (8 ') is a conditional expression related to the ratio between the focal length of the first lens and the focal length of the second lens. This conditional expression (8 ') is a conditional expression regarding the balance between the negative refractive power of the first lens and the positive refractive power of the second lens.
- conditional expression (8 ') If the lower limit value of conditional expression (8 ') is not reached, the positive refractive power in the second lens becomes small, so the effect of aberration correction becomes small. If the upper limit value of conditional expression (8 ') is exceeded, the negative refractive power of the first lens becomes small, and the angle of view of the optical system becomes small. Further, the outer diameter of the first lens is increased, and the entire optical system is increased in size.
- the second lens is a cemented lens and satisfies the following conditional expression (9).
- nd (L2f) is the refractive index of the object side lens in the cemented lens of the second lens
- nd (L2b) is the refractive index of the image side lens in the cemented lens of the second lens, It is.
- the image height of the objective optical system is also reduced. Therefore, the light beam height of the light beam focused on the axis (hereinafter referred to as “axial light beam height”) and the light beam height of the light beam collected at the position of the maximum image height (hereinafter referred to as “off-axis light beam height”).
- axial light beam height the light beam height of the light beam focused on the axis
- off-axis light beam height the light beam height of the light beam collected at the position of the maximum image height
- the axial chromatic aberration is greatly influenced by a lens arranged at a position where the axial ray height is high, and the lateral chromatic aberration is greatly influenced by a lens arranged at a position where the off-axis ray height is high. Therefore, it is checked for each lens whether the correction effect for the longitudinal chromatic aberration or the correction effect for the magnification chromatic aberration is larger, and the balance of the respective glass material configurations is aimed at.
- a cemented lens is disposed in each of the front lens group and the rear lens group, and chromatic aberration in each lens group and chromatic aberration in the entire optical system are corrected satisfactorily.
- the first lens mainly plays a role of determining the angle of view of the optical system. Therefore, the chromatic aberration in the front lens group may be corrected using the second lens as a cemented lens.
- An optical path conversion element is disposed between the second lens and the aperture stop, but the position of the second lens is close to the aperture stop. Therefore, both the on-axis ray height and the off-axis ray height in the second lens are low, and there is not much difference between the ray heights.
- the second lens is constituted by a cemented lens
- conditional expression (9) the longitudinal chromatic aberration and the lateral chromatic aberration in the front lens group can be corrected satisfactorily.
- the second lens may be a single lens having a positive refractive power or a single lens having a negative refractive power.
- the glass material of the second lens is preferably a high dispersion glass material.
- ⁇ d (L2) specifically, ⁇ d (L2) may be 50 or less, and more preferably 45 or less.
- the glass material of the second lens is preferably a low dispersion glass material.
- ⁇ d (L2) may be 50 or more, and more preferably 60 or more.
- the chromatic aberration can be corrected so that the chromatic aberration of the optical system is reduced. If these conditions are not satisfied, the chromatic aberration of the optical system cannot be satisfactorily corrected, so that a high-performance objective optical system cannot be achieved.
- the cemented lens in the rear lens group it is preferable to use a low dispersion glass material for the positive lens glass material and a high dispersion glass material for the negative lens glass material.
- a glass material having anomalous dispersion is preferably used for the glass material of the negative lens. In this way, chromatic aberration can be corrected. Further, the aberration of the entire objective optical system can be balanced.
- the perspective endoscope of the present embodiment is characterized by including the above-described perspective objective optical system.
- the perspective objective optical system of the present embodiment is a small and high-performance perspective objective optical system. Therefore, by providing such a perspective objective optical system, a high-quality image can be obtained, and a perspective endoscope having a thinned tip can be realized.
- the perspective objective optical system of the present embodiment can be used for an endoscope apparatus.
- the endoscope apparatus includes at least the perspective objective optical system of the present embodiment and an image sensor.
- the optical path conversion element is shown as a developed view of a prism. Therefore, the optical path conversion element is drawn as a parallel plane plate.
- FIG. 3 shows an example of a prism that is not expanded.
- FIG. 3 is a lens cross-sectional view when the prism is drawn without being unfolded.
- the oblique objective optical system has a front lens group GF and a rear lens group GR arranged via a prism P, and an aperture stop S is arranged between the prism P and the rear lens group GR.
- the front lens group GF is disposed on the object side of the prism P, and the rear lens group GR is disposed on the image side of the prism P.
- the front lens group GF has a negative refractive power and includes a first lens L1 and a second lens L2.
- the rear lens group GR has a positive refractive power and includes a third lens L3 and a cemented lens CL.
- the first lens L1 is a negative lens having a concave surface on the image plane side.
- the second lens L2 is a single lens having a convex surface facing the image surface side.
- the second lens L2 may be a cemented lens having a convex surface facing the image surface side.
- the third lens L3 is a positive lens.
- the cemented lens CL includes a positive lens L4 made of a biconvex lens and a meniscus negative lens L5.
- the prism P drawn as a parallel plate is configured as a single reflection type prism, as shown in FIG. 4A, a side-view objective optical system capable of 90-degree side observation can be configured. it can. Further, as shown in FIG. 4B, if the reflecting surface of the prism is set to an angle other than 45 degrees, an objective optical system such as a front view and a rear view other than 45 degrees can be configured. Further, as shown in FIG. 4B, if it is configured as a twice-reflecting prism, a 45 ° forward-view objective optical system can be configured.
- the prism P can be composed of a plurality of prisms.
- FIG. 4C shows a configuration in which the two prisms can be viewed from the side
- FIG. 4D shows a configuration in which the two prisms can be viewed from the front.
- the air equivalent length in the prism can be shortened.
- the air-converted length at the prism is shortened, it is possible to suppress an increase in the height of the light beam in the front lens group, and thus the lens can be miniaturized.
- the dispersion is large in the high refractive index glass material, chromatic aberration due to the prism is likely to occur. For this reason, it is necessary to suppress an increase in the amount of aberration generated in the entire optical system by correction using a lens.
- the dispersion is small in the low refractive index glass material, so that chromatic aberration due to the prism hardly occurs.
- the air-converted length at the prism is long, the light ray height in the front lens group tends to be high.
- the height of the light beam in the front lens group can be kept low by arranging two lenses on the object side of the prism. By doing so, an increase in the lens outer diameter of the front lens group can be suppressed.
- the glass material of the prism is not limited to a specific glass material. Therefore, no matter what glass material is used for the prism, a compact and high-performance objective optical system can be configured.
- the glass material of the first lens L1 may be sapphire. Since sapphire is a very hard material, it is resistant to external impacts. Therefore, the lens surface on the object side is hardly damaged. By using sapphire, reflection of scratches on an image and occurrence of flare due to scratches are less likely to occur.
- the glass material of the first lens L1 is not limited to sapphire. If a crystal material with high hardness is used for the first lens L1, the surface of the lens is hardly damaged.
- the radius of curvature of the lens surface can be increased. In this case, it is possible to reduce the size of the lens while appropriately securing the edge thickness of the lens. However, since the high refractive index glass material has a large dispersion, chromatic aberration is likely to occur.
- the radius of curvature of the positive lens becomes small.
- the center thickness of the positive lens is increased in order to ensure an appropriate edge thickness.
- the lens length of the rear lens group becomes long. As a result, the interval necessary for focus adjustment is insufficient and the lens system is enlarged.
- the refractive index is small, it is better to use a low-dispersion glass material that is advantageous for reducing chromatic aberration, rather than using a high-refractive index glass material for the positive lens glass material.
- the perspective objective optical system of the present embodiment by configuring the optical system optimally, a perspective objective optical system that has excellent workability, high performance, and miniaturization is realized.
- the absolute value of the radius of curvature of the object side surface of the third lens L3 is made larger than the absolute value of the radius of curvature of the image side surface, it is easy to correct the aberration.
- the glass material of the positive lens L4 it is preferable to use a high dispersion glass material having a refractive index of 1.9 or more and an Abbe number of 25 or less. By doing so, the correction of chromatic aberration can be improved.
- the cemented lens CL by arranging the cemented lens CL at a position close to the image plane, the height of the light beam passing through the cemented lens CL is increased.
- the cemented lens CL By locating the cemented lens CL at a position where the light beam height is high, the lateral chromatic aberration can be favorably corrected.
- disposing the cemented lens CL at a position close to the image plane is particularly effective for correcting lateral chromatic aberration.
- the parallel plate other than the prism provided in the oblique objective optical system is, for example, an infrared cut filter or a color temperature conversion filter. These filters are used for sensitivity correction and color correction of an image sensor such as a CCD.
- a laser cut filter or a special function filter may be arranged in the perspective objective optical system.
- the laser cut filter include a filter for cutting laser light such as a YAG laser and a semiconductor laser.
- the special function filter for example, there is a notch filter that cuts light in a specific wavelength range.
- an absorption type filter, a reflection type filter, or a composite type thereof may be used.
- a filter provided with an antireflection film may be used.
- an interference film having infrared cut characteristics or laser light cut characteristics can be provided on the transmission surface of the prism.
- the parallel plate filters arranged on the image plane side of the oblique objective optical system are a cover glass CG and a glass lid GL used for the image sensor.
- the image sensor is fixed in the frame member by holding the side surface and the surface of the cover glass CG with the frame member.
- the image plane I of the perspective objective optical system is the light receiving surface position of the image sensor.
- a filter can be provided in the vicinity of the first lens L1, and the volume of the air layer formed on the image plane side of the first lens L1 can be reduced. As a result, the influence of fogging due to condensation on the lens surface can be reduced.
- first lens L1 and the filter may be joined, and both may be hermetically sealed with solder or the like. By doing in this way, clouding can be prevented more effectively.
- the number of cemented lenses in the perspective objective optical system is four.
- the F number of the squint objective optical system is small and the number of lenses is as small as four, the imaging performance is good.
- the lenses are densely arranged so that the distance between the lenses is minimized. Therefore, the entire optical system can be reduced in size.
- FIG. 1 shows a cross-sectional view of the perspective objective optical system.
- P represents a prism
- F1 represents a filter
- CG represents a cover glass
- GL represents a glass lid.
- SA spherical aberration
- AS astigmatism
- DT distortion
- CC lateral chromatic aberration
- the horizontal axis represents the amount of aberration.
- the unit of aberration is mm.
- the unit of aberration is%. IH is the image height, the unit is mm, and Fno is the F number.
- the unit of the wavelength of the aberration curve is nm.
- Example 1 A perspective objective optical system according to Example 1 will be described.
- the perspective objective optical system of Example 1 includes, in order from the object side, a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power. And consist of
- the front lens group GF is composed of a plano-concave negative lens L1 having a plane on the object side and a positive meniscus lens L2 having a convex surface facing the image surface side.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L3, a biconvex positive lens L4, and a negative meniscus lens L5 having a convex surface facing the image side.
- the biconvex positive lens L4 and the negative meniscus lens L5 form a cemented lens having a positive refractive power.
- the biconvex positive lens L3 has a surface with a small radius of curvature facing the image surface side. The comparison of the radius of curvature of the lens surface is performed in absolute value. The same applies to Examples 2 to 33.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L3 and the cemented lens.
- Example 1 the total angle of view is 100 degrees.
- Example 2 A perspective objective optical system according to Example 2 will be described.
- the perspective objective optical system of Example 2 includes, in order from the object side, a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power. And consist of
- the front lens group GF is composed of a plano-concave negative lens L1 having a plane on the object side and a positive meniscus lens L2 having a convex surface facing the image surface side.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L3, a biconvex positive lens L4, and a negative meniscus lens L5 having a convex surface facing the image side.
- the biconvex positive lens L4 and the negative meniscus lens L5 form a cemented lens having a positive refractive power.
- the biconvex positive lens L3 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L3 and the cemented lens.
- Example 2 the total angle of view is 100 degrees.
- Example 3 A perspective objective optical system according to Example 3 will be described.
- the perspective objective optical system of Example 3 includes, in order from the object side, a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power. And consist of
- the front lens group GF is composed of a plano-concave negative lens L1 having a plane on the object side and a positive meniscus lens L2 having a convex surface facing the image surface side.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L3, a biconvex positive lens L4, and a negative meniscus lens L5 having a convex surface facing the image side.
- the biconvex positive lens L4 and the negative meniscus lens L5 form a cemented lens having a positive refractive power.
- the biconvex positive lens L3 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L3 and the cemented lens.
- Example 3 the total angle of view is 100 degrees.
- Example 4 A perspective objective optical system according to Example 4 will be described.
- the perspective objective optical system of Example 4 includes, in order from the object side, a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power. And consist of
- the front lens group GF is composed of a plano-concave negative lens L1 having a plane on the object side and a positive meniscus lens L2 having a convex surface facing the image surface side.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L3, a biconvex positive lens L4, and a negative meniscus lens L5 having a convex surface facing the image side.
- the biconvex positive lens L4 and the negative meniscus lens L5 form a cemented lens having a positive refractive power.
- the biconvex positive lens L3 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L3 and the cemented lens.
- Example 4 the total angle of view is 100 degrees.
- Example 5 A perspective objective optical system according to Example 5 will be described.
- the perspective objective optical system of Example 5 includes, in order from the object side, a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power. And consist of
- the front lens group GF is composed of a plano-concave negative lens L1 having a plane on the object side and a positive meniscus lens L2 having a convex surface facing the image surface side.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L3, a biconvex positive lens L4, and a negative meniscus lens L5 having a convex surface facing the image side.
- the biconvex positive lens L4 and the negative meniscus lens L5 form a cemented lens having a positive refractive power.
- the biconvex positive lens L3 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L3 and the cemented lens.
- Example 5 the total angle of view is 100 degrees.
- the oblique objective optical system according to the sixth exemplary embodiment includes, in order from the object side, a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power. And consist of
- the front lens group GF is composed of a plano-concave negative lens L1 having a plane on the object side and a biconvex positive lens L2.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L3, a biconvex positive lens L4, and a negative meniscus lens L5 having a convex surface facing the image side.
- the biconvex positive lens L4 and the negative meniscus lens L5 form a cemented lens having a positive refractive power.
- the biconvex positive lens L3 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L3 and the cemented lens.
- Example 6 the total angle of view is 100 degrees.
- Example 7 A perspective objective optical system according to Example 7 will be described.
- the perspective objective optical system of Example 7 includes, in order from the object side, a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power. And consist of
- the front lens group GF is composed of a plano-concave negative lens L1 having a plane on the object side and a positive meniscus lens L2 having a convex surface facing the image surface side.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L3, a biconvex positive lens L4, and a negative meniscus lens L5 having a convex surface facing the image side.
- the biconvex positive lens L4 and the negative meniscus lens L5 form a cemented lens having a positive refractive power.
- the biconvex positive lens L3 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L3 and the cemented lens.
- Example 7 the total angle of view is 100 degrees.
- the perspective objective optical system according to the eighth embodiment includes, in order from the object side, a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power. And consist of
- the front lens group GF is composed of a plano-concave negative lens L1 having a plane on the object side and a positive meniscus lens L2 having a convex surface facing the image surface side.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L3, a biconvex positive lens L4, and a negative meniscus lens L5 having a convex surface facing the image side.
- the biconvex positive lens L4 and the negative meniscus lens L5 form a cemented lens having a positive refractive power.
- the biconvex positive lens L3 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L3 and the cemented lens.
- Example 8 the total angle of view is 100 degrees.
- Example 9 A perspective objective optical system according to Example 9 will be described.
- the oblique objective optical system according to the ninth embodiment includes, in order from the object side, a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power. And consist of
- the front lens group GF is composed of a plano-concave negative lens L1 having a plane on the object side and a positive meniscus lens L2 having a convex surface facing the image surface side.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L3, a biconvex positive lens L4, and a negative meniscus lens L5 having a convex surface facing the image side.
- the biconvex positive lens L4 and the negative meniscus lens L5 form a cemented lens having a positive refractive power.
- the biconvex positive lens L3 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L3 and the cemented lens.
- Example 9 the total angle of view is 100 degrees.
- Example 10 A perspective objective optical system according to Example 10 will be described.
- the perspective objective optical system of Example 10 includes, in order from the object side, a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power. And consist of
- the front lens group GF is composed of a plano-concave negative lens L1 having a plane on the object side and a positive meniscus lens L2 having a convex surface facing the image surface side.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L3, a biconvex positive lens L4, and a negative meniscus lens L5 having a convex surface facing the image side.
- the biconvex positive lens L4 and the negative meniscus lens L5 form a cemented lens having a positive refractive power.
- the biconvex positive lens L3 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L3 and the cemented lens.
- Example 10 the total angle of view is 120 degrees.
- the angle of view is wider in the tenth embodiment.
- the oblique objective optical system according to the eleventh embodiment includes, in order from the object side, a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power. And consist of
- the front lens group GF is composed of a plano-concave negative lens L1 having a plane on the object side and a positive meniscus lens L2 having a convex surface facing the image surface side.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L3, a biconvex positive lens L4, and a negative meniscus lens L5 having a convex surface facing the image side.
- the biconvex positive lens L4 and the negative meniscus lens L5 form a cemented lens having a positive refractive power.
- the biconvex positive lens L3 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L3 and the cemented lens.
- Example 11 the angle of view is 140 degrees.
- the lens configuration of Example 11 is the same as the lens configuration of Example 10, but compared to Example 10, in Example 11, the angle of view is further widened.
- the squint objective optical system of the twelfth embodiment includes, in order from the object side, a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power. And consist of
- the front lens group GF is composed of a plano-concave negative lens L1 having a plane on the object side and a positive meniscus lens L2 having a convex surface facing the image surface side.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L3, a biconvex positive lens L4, and a negative meniscus lens L5 having a convex surface facing the image side.
- the biconvex positive lens L4 and the negative meniscus lens L5 form a cemented lens having a positive refractive power.
- the biconvex positive lens L3 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L3 and the cemented lens.
- Example 12 the angle of view is 140 degrees.
- the lens configuration of the twelfth embodiment is the same as the lens configuration of the tenth embodiment, but the angle of view is wider in the twelfth embodiment than in the tenth embodiment.
- the squint objective optical system of the thirteenth embodiment includes, in order from the object side, a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power. And consist of
- the front lens group GF includes a plano-concave negative lens L1 having a flat surface on the object side, a negative meniscus lens L2 having a convex surface facing the image surface side, and a positive meniscus lens L3 having a convex surface facing the image surface side.
- the negative meniscus lens L2 and the positive meniscus lens L3 form a cemented lens having a positive refractive power.
- the crystal material made of sapphire is used for the planoconcave negative lens L1. Since sapphire is hard, it is hard to be scratched on the lens surface, and it is resistant to external impacts, so it is hard to break.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L4, a biconvex positive lens L5, and a negative meniscus lens L6 having a convex surface facing the image side.
- the biconvex positive lens L5 and the negative meniscus lens L6 form a cemented lens having a positive refractive power.
- the biconvex positive lens L4 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L4 and the cemented lens.
- Example 13 the total angle of view is 100 degrees.
- Example 14 A perspective objective optical system according to Example 14 will be described.
- the perspective objective optical system of Example 14 includes, in order from the object side, a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power. And consist of
- the front lens group GF includes a plano-concave negative lens L1 having a flat surface on the object side, a negative meniscus lens L2 having a convex surface facing the image surface side, and a positive meniscus lens L3 having a convex surface facing the image surface side.
- the negative meniscus lens L2 and the positive meniscus lens L3 form a cemented lens having a positive refractive power.
- the crystal material made of sapphire is used for the planoconcave negative lens L1. Since sapphire is hard, it is hard to be scratched on the lens surface, and it is resistant to external impacts, so it is hard to break.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L4, a biconvex positive lens L5, and a negative meniscus lens L6 having a convex surface facing the image side.
- the biconvex positive lens L5 and the negative meniscus lens L6 form a cemented lens having a positive refractive power.
- the biconvex positive lens L4 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L4 and the cemented lens.
- Example 14 the total angle of view is 100 degrees.
- the squint objective optical system of the fifteenth embodiment includes, in order from the object side, a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power. And consist of
- the front lens group GF includes a plano-concave negative lens L1 having a flat surface on the object side, a negative meniscus lens L2 having a convex surface facing the image surface side, and a positive meniscus lens L3 having a convex surface facing the image surface side.
- the negative meniscus lens L2 and the positive meniscus lens L3 form a cemented lens having a positive refractive power.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L4, a biconvex positive lens L5, and a negative meniscus lens L6 having a convex surface facing the image side.
- the biconvex positive lens L5 and the negative meniscus lens L6 form a cemented lens having a positive refractive power.
- the biconvex positive lens L4 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L4 and the cemented lens.
- Example 15 the total angle of view is 100 degrees.
- Example 16 A perspective objective optical system according to Example 16 will be described.
- the squint objective optical system of Example 16 has, in order from the object side, a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power. And consist of
- the front lens group GF is composed of a plano-concave negative lens L1, a biconcave negative lens L2, and a biconvex positive lens L3.
- the biconcave negative lens L2 and the biconvex positive lens L3 form a cemented lens having a positive refractive power.
- the crystal material made of sapphire is used for the planoconcave negative lens L1. Since sapphire is hard, the lens surface is hard to be scratched, and it is hard to crack strongly against external impacts.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L4, a biconvex positive lens L5, and a negative meniscus lens L6 having a convex surface facing the image side.
- the biconvex positive lens L5 and the negative meniscus lens L6 form a cemented lens having a positive refractive power.
- the biconvex positive lens L4 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L4 and the cemented lens.
- Example 16 the total angle of view is 100 degrees.
- the perspective objective optical system according to Example 17 includes, in order from the object side, a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power. And consist of
- the front lens group GF includes a plano-concave negative lens L1 having a flat surface on the object side, a negative meniscus lens L2 having a convex surface facing the image surface side, and a positive meniscus lens L3 having a convex surface facing the image surface side.
- the negative meniscus lens L2 and the positive meniscus lens L3 form a cemented lens having a positive refractive power.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L4, a biconvex positive lens L5, and a negative meniscus lens L6 having a convex surface facing the image side.
- the biconvex positive lens L5 and the negative meniscus lens L6 form a cemented lens having a positive refractive power.
- the biconvex positive lens L4 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L4 and the cemented lens.
- Example 17 the total angle of view is 120 degrees.
- the angle of view is wider in the seventeenth embodiment.
- Example 18 A perspective objective optical system according to Example 18 will be described.
- the squint objective optical system of Example 18 is composed of a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power in order from the object side. And consist of
- the front lens group GF includes a plano-concave negative lens L1 having a flat surface on the object side, a negative meniscus lens L2 having a convex surface facing the image surface side, and a positive meniscus lens L3 having a convex surface facing the image surface side.
- the negative meniscus lens L2 and the positive meniscus lens L3 form a cemented lens having a positive refractive power.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L4, a biconvex positive lens L5, and a negative meniscus lens L6 having a convex surface facing the image side.
- the biconvex positive lens L5 and the negative meniscus lens L6 form a cemented lens having a positive refractive power.
- the biconvex positive lens L4 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L4 and the cemented lens.
- Example 18 the angle of view is 140 degrees.
- the lens configuration of Example 18 is the same as the lens configuration of Example 17, but the angle of view is wider in Example 18 than in Example 17.
- Example 19 A perspective objective optical system according to Example 19 will be described.
- the perspective objective optical system of Example 19 is composed of a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power in order from the object side. And consist of
- the front lens group GF is composed of a plano-concave negative lens L1, a biconcave negative lens L2, and a biconvex positive lens L3.
- the biconcave negative lens L2 and the biconvex positive lens L3 form a cemented lens having a positive refractive power.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L4, a biconvex positive lens L5, and a negative meniscus lens L6 having a convex surface facing the image side.
- the biconvex positive lens L5 and the negative meniscus lens L6 form a cemented lens having a positive refractive power.
- the biconvex positive lens L4 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L4 and the cemented lens.
- Example 19 the total angle of view is 150 degrees. Compared to Example 18, in Example 19, the angle of view is further widened.
- the squint objective optical system according to the twentieth embodiment includes, in order from the object side, a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power. And consist of
- the front lens group GF is composed of a plano-concave negative lens L1 whose object side is a flat surface and a negative meniscus lens L2 having a convex surface facing the image surface side.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L3, a biconvex positive lens L4, and a negative meniscus lens L5 having a convex surface facing the image side.
- the biconvex positive lens L4 and the negative meniscus lens L5 form a cemented lens having a positive refractive power.
- the biconvex positive lens L3 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L3 and the cemented lens.
- Example 20 the total angle of view is 100 degrees.
- Example 21 A perspective objective optical system according to Example 21 will be described.
- the perspective objective optical system of Example 21 is composed of a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power in order from the object side. And consist of
- the front lens group GF is composed of a plano-concave negative lens L1 whose object side is a flat surface and a negative meniscus lens L2 having a convex surface facing the image surface side.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L3, a biconvex positive lens L4, and a negative meniscus lens L5 having a convex surface facing the image side.
- the biconvex positive lens L4 and the negative meniscus lens L5 form a cemented lens having a positive refractive power.
- the biconvex positive lens L3 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L3 and the cemented lens.
- Example 21 the total angle of view is 100 degrees.
- Example 22 A perspective objective optical system according to Example 22 will be described.
- the perspective objective optical system of Example 22 is composed of a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power in order from the object side. And consist of
- the front lens group GF is composed of a plano-concave negative lens L1 whose object side is a flat surface and a negative meniscus lens L2 having a convex surface facing the image surface side.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L3, a biconvex positive lens L4, and a negative meniscus lens L5 having a convex surface facing the image side.
- the biconvex positive lens L4 and the negative meniscus lens L5 form a cemented lens having a positive refractive power.
- the biconvex positive lens L3 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L3 and the cemented lens.
- Example 22 the total angle of view is 100 degrees.
- Example 23 A perspective objective optical system according to Example 23 will be described.
- the squint objective optical system of Example 23 has, in order from the object side, a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power. And consist of
- the front lens group GF is composed of a plano-concave negative lens L1 whose object side is a flat surface and a negative meniscus lens L2 having a convex surface facing the image surface side.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L3, a biconvex positive lens L4, and a negative meniscus lens L5 having a convex surface facing the image side.
- the biconvex positive lens L4 and the negative meniscus lens L5 form a cemented lens having a positive refractive power.
- the biconvex positive lens L3 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L3 and the cemented lens.
- Example 23 the total angle of view is 100 degrees.
- Example 24 A perspective objective optical system according to Example 24 will be described.
- the perspective objective optical system of Example 24 is composed of a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power in order from the object side. And consist of
- the front lens group GF is composed of a plano-concave negative lens L1 whose object side is a flat surface and a negative meniscus lens L2 having a convex surface facing the image surface side.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L3, a biconvex positive lens L4, and a negative meniscus lens L5 having a convex surface facing the image side.
- the biconvex positive lens L4 and the negative meniscus lens L5 form a cemented lens having a positive refractive power.
- the biconvex positive lens L3 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L3 and the cemented lens.
- Example 24 the total angle of view is 119.6 degrees.
- the angle of view is wider.
- Example 25 A perspective objective optical system according to Example 25 will be described.
- the squint objective optical system of Example 25 is composed of a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power in order from the object side. And consist of
- the front lens group GF is composed of a plano-concave negative lens L1 whose object side is a flat surface and a negative meniscus lens L2 having a convex surface facing the image surface side.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L3, a biconvex positive lens L4, and a negative meniscus lens L5 having a convex surface facing the image side.
- the biconvex positive lens L4 and the negative meniscus lens L5 form a cemented lens having a positive refractive power.
- the biconvex positive lens L3 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L3 and the cemented lens.
- Example 25 the total angle of view is 140 degrees. Compared to Example 24, in Example 25, the angle of view is further widened.
- Example 26 A perspective objective optical system according to Example 26 will be described.
- the oblique objective optical system of Example 26 is composed of a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power in order from the object side. And consist of
- the front lens group GF includes a plano-concave negative lens L1 having a flat surface on the object side, a negative meniscus lens L2 having a convex surface facing the image surface side, and a positive meniscus lens L3 having a convex surface facing the image surface side.
- the negative meniscus lens L2 and the positive meniscus lens L3 form a cemented lens having negative refractive power.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L4, a biconvex positive lens L5, and a negative meniscus lens L6 having a convex surface facing the image side.
- the biconvex positive lens L5 and the negative meniscus lens L6 form a cemented lens having a positive refractive power.
- the biconvex positive lens L4 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L4 and the cemented lens.
- Example 26 the total angle of view is 100 degrees.
- Example 27 A perspective objective optical system according to Example 27 will be described.
- the perspective objective optical system of Example 27 is composed of a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power in order from the object side. And consist of
- the front lens group GF includes a plano-concave negative lens L1 having a flat surface on the object side, a negative meniscus lens L2 having a convex surface facing the image surface side, and a positive meniscus lens L3 having a convex surface facing the image surface side.
- the negative meniscus lens L2 and the positive meniscus lens L3 form a cemented lens having negative refractive power.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L4, a biconvex positive lens L5, and a negative meniscus lens L6 having a convex surface facing the image side.
- the biconvex positive lens L5 and the negative meniscus lens L6 form a cemented lens having a positive refractive power.
- the biconvex positive lens L4 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L4 and the cemented lens.
- Example 27 the total angle of view is 100 degrees.
- Example 28 A strabismus objective optical system according to Example 28 will be described.
- the squint objective optical system of Example 28 has a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power in order from the object side. And consist of
- the front lens group GF includes a plano-concave negative lens L1 having a flat surface on the object side, a negative meniscus lens L2 having a convex surface facing the image surface side, and a positive meniscus lens L3 having a convex surface facing the image surface side.
- the negative meniscus lens L2 and the positive meniscus lens L3 form a cemented lens having negative refractive power.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L4, a biconvex positive lens L5, and a negative meniscus lens L6 having a convex surface facing the image side.
- the biconvex positive lens L5 and the negative meniscus lens L6 form a cemented lens having a positive refractive power.
- the biconvex positive lens L4 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L4 and the cemented lens.
- Example 28 the total angle of view is 100 degrees.
- Example 29 A strabismus objective optical system according to Example 29 will be described.
- the perspective objective optical system of Example 29 is composed of a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power in order from the object side. And consist of
- the front lens group GF includes a plano-concave negative lens L1 having a flat surface on the object side, a negative meniscus lens L2 having a convex surface facing the image surface side, and a positive meniscus lens L3 having a convex surface facing the image surface side.
- the negative meniscus lens L2 and the positive meniscus lens L3 form a cemented lens having negative refractive power.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L4, a biconvex positive lens L5, and a negative meniscus lens L6 having a convex surface facing the image side.
- the biconvex positive lens L5 and the negative meniscus lens L6 form a cemented lens having a positive refractive power.
- the biconvex positive lens L4 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L4 and the cemented lens.
- Example 29 the total angle of view is 100 degrees.
- Example 30 A perspective objective optical system according to Example 30 will be described.
- the perspective objective optical system of Example 30 includes, in order from the object side, a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power. And consist of
- the front lens group GF includes a plano-concave negative lens L1 having a flat surface on the object side, a negative meniscus lens L2 having a convex surface facing the image surface side, and a positive meniscus lens L3 having a convex surface facing the image surface side.
- the negative meniscus lens L2 and the positive meniscus lens L3 form a cemented lens having negative refractive power.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L4, a biconvex positive lens L5, and a negative meniscus lens L6 having a convex surface facing the image side.
- the biconvex positive lens L5 and the negative meniscus lens L6 form a cemented lens having a positive refractive power.
- the biconvex positive lens L4 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L4 and the cemented lens.
- Example 30 the total angle of view is 100 degrees.
- Example 31 A perspective objective optical system according to Example 31 will be described.
- the perspective objective optical system of Example 31 includes, in order from the object side, a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power. And consist of
- the front lens group GF includes a plano-concave negative lens L1 having a flat surface on the object side, a negative meniscus lens L2 having a convex surface facing the image surface side, and a positive meniscus lens L3 having a convex surface facing the image surface side.
- the negative meniscus lens L2 and the positive meniscus lens L3 form a cemented lens having negative refractive power.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L4, a biconvex positive lens L5, and a negative meniscus lens L6 having a convex surface facing the image side.
- the biconvex positive lens L5 and the negative meniscus lens L6 form a cemented lens having a positive refractive power.
- the biconvex positive lens L4 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L4 and the cemented lens.
- Example 31 the total angle of view is 100 degrees.
- Example 32 A perspective objective optical system according to Example 32 will be described.
- the perspective objective optical system of Example 32 is composed of a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power in order from the object side. And consist of
- the front lens group GF is composed of a plano-concave negative lens L1, a biconcave negative lens L2, and a biconvex positive lens L3.
- the biconcave negative lens L2 and the biconvex positive lens L3 form a cemented lens having negative refractive power.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L4, a biconvex positive lens L5, and a negative meniscus lens L6 having a convex surface facing the image side.
- the biconvex positive lens L5 and the negative meniscus lens L6 form a cemented lens having a positive refractive power.
- the biconvex positive lens L4 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L4 and the cemented lens.
- Example 32 the total angle of view is 100 degrees.
- Example 33 A perspective objective optical system according to Example 33 will be described.
- the perspective objective optical system of Example 33 includes, in order from the object side, a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power. And consist of
- the front lens group GF includes a plano-concave negative lens L1 whose object side is a plane and a plano-convex positive lens L2 whose object side is a plane.
- the optical path conversion element P is disposed between the front lens group GF and the rear lens group GR.
- the optical path conversion element P is a prism.
- the brightness stop S is disposed between the optical path conversion element P and the rear lens group GR. More specifically, the aperture stop S is provided on the image side surface of the optical path conversion element P.
- the rear lens group GR includes a biconvex positive lens L3, a biconvex positive lens L4, and a negative meniscus lens L5 having a convex surface facing the image side.
- the biconvex positive lens L4 and the negative meniscus lens L5 form a cemented lens having a positive refractive power.
- the biconvex positive lens L3 has a surface with a small radius of curvature facing the image surface side.
- the rear lens group GR is provided with a filter F1, a cover glass CG, and a glass lid GL.
- the filter F1 is disposed between the biconvex positive lens L3 and the cemented lens.
- Example 33 the total angle of view is 100 degrees.
- the perspective objective optical system of each embodiment has the front lens group disposed on the object side of the prism and the rear lens group disposed on the image side of the prism, and the front lens group.
- Is composed of a lens having a negative refractive power and a negative refractive power with a concave surface facing the image surface side, and a single lens or a cemented lens having a convex surface facing the image surface side, and the rear lens group is
- the lens is composed of a lens having a positive refractive power and a positive refractive power, and a cemented lens having a positive refractive power.
- the cemented lens sequentially includes a lens having a positive refractive power and a lens having a negative refractive power.
- An aperture stop is provided between the prism and the rear lens group.
- the perspective objective optical system of each embodiment has an optimal lens configuration that improves optical performance in response to the downsizing of the image sensor and the increase in the number of pixels, and this configuration reduces the diameter of the distal end portion of the endoscope. Can also contribute. Furthermore, since the perspective objective optical system of each example satisfies each conditional expression, various aberrations are corrected well.
- r is the radius of curvature of each surface
- d is the thickness or air spacing of each optical member
- nd is the refractive index of each optical member with respect to the d-line
- ⁇ d is the Abbe number of each optical member with respect to the d-line.
- IH is the image height
- ⁇ is the half angle of view
- Fno is the F number
- f is the focal length of the entire objective optical system
- D1 is from the image side surface of the lens located closest to the image plane of the front lens group.
- Air-converted length to the aperture stop D2 is the air-converted length from the image side to the image plane of the final lens in the rear lens group
- L is the total length of the objective optical system
- fF is the focal length of the front lens group
- fR is the rear
- the focal length on the side, ⁇ d (L2), is the Abbe number of the second lens.
- the unit of r, d, IH, the air conversion length, the total length of the objective optical system, and each focal length is mm.
- F is standardized to 1 mm.
- Numerical example 22 Unit mm Surface data Surface number r d nd ⁇ d 1 ⁇ 0.5602 1.51633 64.14 2 1.1547 1.0724 3 -1.9181 0.9124 1.51633 64.14 4 -2.2743 0.2801 5 ⁇ 3.3614 1.51633 64.14 6 ⁇ 0.0000 7 (Aperture) ⁇ 0.3361 8 7.1862 0.9594 1.58913 61.14 9 -3.5738 0.1044 10 ⁇ 0.7470 1.49400 75.00 11 ⁇ 0.1867 12 1.8467 1.4511 1.51633 64.14 13 -1.8306 0.5602 1.92286 18.90 14 -7.1502 0.6907 15 ⁇ 0.6163 1.51633 64.14 16 ⁇ 0.0187 1.51300 64.00 17 ⁇ 0.6536 1.50510 63.26 18 ⁇ 0.0000 (Image plane) Various data IH 0.754 ⁇ 50.424 Fno 3.226 f 1 D1 2.497 D2 1.544 L 12.511
- Example 1 Example 2
- Example 3 Example 4 (1) D1 / f 1.866 2.021 2.31 2.205 (2) D2 / f 1.278 1.453 1.437 1.439 (3) L / f 11.268 12.398 12.37 12.098 (4) D1 / D2 1.46 1.391 1.608 1.533 (5)
- 1.494 1.393 1.461 1.569 (8)
- Example 5 Example 6
- Example 7 Example 8 (1) D1 / f 2.547 2.482 2.501 2.159 (2) D2 / f 1.573 1.453 1.466 1.48
- FIG. 38 is a configuration example of an endoscope apparatus using the perspective objective optical system of the present embodiment.
- the endoscope apparatus 20 includes a perspective endoscope 21 (hereinafter referred to as “endoscope 21”), a video processor 22, and a monitor 23.
- the endoscope 21 includes an insertion portion 21a and a signal cable 21b.
- a perspective objective optical system 24 is disposed at the distal end of the insertion portion 21a.
- the perspective objective optical system 24 is a perspective objective optical system for front-view observation.
- any one of the perspective objective optical systems according to the first to thirty-third embodiments is used.
- an illumination optical system for illuminating the subject 25 is arranged in the vicinity of the oblique objective optical system 24.
- the illumination optical system includes a light source, an illumination optical element, and an optical fiber bundle.
- the light source include a light emitting element such as a light emitting diode (LED: Light Emitting Diode) and a laser diode (LD: Laser Diode).
- An example of the illumination optical element is a lens element.
- the lens element has a function of diffusing or condensing illumination light.
- the optical fiber bundle transmits illumination light to the endoscope 21.
- the endoscope 21 is connected to the video processor 22 via the signal cable 21b.
- An image of the subject 25 imaged by the squint objective optical system 24 is captured by an image sensor.
- the captured image of the subject 25 is converted into a video signal by an electric circuit system built in the video processor 22.
- a subject image 26 is displayed on the monitor 23 based on the video signal.
- an electric circuit system for driving a light source such as an LED is provided.
- a light emitting element such as an LED or LD in the endoscope 21
- providing these light emitting elements at the distal end portion of the endoscope 21 eliminates the need to provide an optical fiber bundle for transmitting illumination light.
- a xenon lamp or a halogen lamp may be used as the light source.
- a light source device incorporating a light source is integrated with the video processor 22.
- the light source device may be configured separately from the video processor 22. In this case, the light source device and the video processor 22 are connected to the endoscope 21, respectively.
- the perspective objective optical system of the present invention it is possible to provide a high-performance and compact perspective objective optical system that is most suitable for an image sensor having a large number of pixels and a reduced size. Furthermore, by using the perspective objective optical system of the present invention, a high-quality image can be obtained, and a perspective endoscope having a thinned tip can be provided.
- the front lens group having a negative refractive power, an optical path conversion element, an aperture stop, and a rear lens group having a positive refractive power In order from the object side, the front lens group having a negative refractive power, an optical path conversion element, an aperture stop, and a rear lens group having a positive refractive power, The front lens group includes a first lens and a second lens, The rear lens group includes a third lens and a cemented lens having a positive refractive power, The first lens is a negative lens having a concave surface on the image plane side, The second lens is a single lens or a cemented lens with a convex surface facing the image surface side, The third lens consists of a positive lens, The cemented lens is composed of a positive lens composed of a biconvex lens and a meniscus negative lens, The following conditional expressions (1) to (3) are satisfied.
- D1 is the air equivalent length from the image side surface of the lens located closest to the image plane side of the front lens group to the aperture stop
- D2 is the air equivalent length from the image side surface to the image surface of the final lens in the rear lens group
- L is the total length of the perspective objective optical system
- f is the focal length of the entire oblique objective optical system
- Appendix 9 An oblique endoscope comprising the oblique objective optical system according to any one of appendices 1 to 8.
- the present invention is useful for a high-performance and small-sized perspective objective optical system. Moreover, it is useful for a perspective endoscope having a high-quality image and having a thinned tip.
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Abstract
Description
物体側から順に、負の屈折力を有する前側レンズ群と、光路変換素子と、明るさ絞りと、正の屈折力を有する後側レンズ群と、からなり、
前側レンズ群は、第1レンズと、第2レンズと、からなり、
後側レンズ群は、第3レンズと、正の屈折力を有する接合レンズと、からなり、
第1レンズは、像面側に凹面を向けた負レンズからなり、
第2レンズは、像面側に凸面を向けた単レンズ、もしくは接合レンズからなり、
第3レンズは、正レンズからなり、
接合レンズは、両凸レンズからなる正レンズと、メニスカス形状の負レンズと、からなり、
以下の条件式(1)乃至(3)を満足することを特徴とする。
1.6<D1/f<4.7 (1)
1.0<D2/f<3.3 (2)
9.0<L/f<31.0 (3)
ただし、
D1は、前側レンズ群の最も像面側に位置するレンズの像側面から明るさ絞りまでの空気換算長、
D2は、後側レンズ群の最終レンズの像側面から像面までの空気換算長、
Lは、斜視対物光学系の全長、
fは、斜視対物光学系全系の焦点距離、
である。
1.6<D1/f<4.7 (1)
1.0<D2/f<3.3 (2)
9.0<L/f<31.0 (3)
ただし、
D1は、前側レンズ群の最も像面側に位置するレンズの像側面から明るさ絞りまでの空気換算長、
D2は、後側レンズ群の最終レンズの像側面から像面までの空気換算長、
Lは、斜視対物光学系の全長、
fは、斜視対物光学系全系の焦点距離、
である。
D1=d4+d5/n5+d6
D2=d14+d15/n15+d16/n16+d17/n17+d18
1.0<D1/D2<2.5 (4)
ただし、
D1は、前側レンズ群の最も像面側に位置するレンズの像側面から明るさ絞りまでの空気換算長、
D2は、後側レンズ群の最終レンズの像側面から像面までの空気換算長、
である。
1.6<|fF/f|<4.5 (5)
1.9<fR/f<5.3 (6)
ただし、
fFは、前側レンズ群の焦点距離、
fRは、後側レンズ群の焦点距離、
fは、斜視対物光学系全系の焦点距離、
である。
1.2<|f1/f|<4.5 (7)
0.001<|f1/f2|<0.9 (8)
ただし、
f1は、第1レンズの焦点距離、
f2は、第2レンズの焦点距離、
fは、斜視対物光学系全系の焦点距離、
である。
1.2<|f1/f|<2.4 (7’)
ただし、
f1は、第1レンズの焦点距離、
fは、斜視対物光学系全系の焦点距離、
である。
1.9<|f1/f|<4.5 (7”)
ただし、
f1は、第1レンズの焦点距離、
fは、斜視対物光学系全系の焦点距離、
である。
0.02<|f1/f2|<0.22 (8’)
ただし、
f1は、第1レンズの焦点距離、
f2は、第2レンズの焦点距離、
である。
|nd(L2f)-nd(L2b)|≦0.1 (9)
ただし、
nd(L2f)は、第2レンズの接合レンズにおける物体側レンズの屈折率、
nd(L2b)は、第2レンズの接合レンズにおける像面側レンズの屈折率、
である。
実施例1に係る斜視対物光学系について説明する。実施例1の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
nd:d線における屈折率
νd:アッベ数
HRI:高屈折率硝材
LRI:低屈折率硝材
HD:高分散硝材
LD:低分散硝材
HRI-HD:高屈折率、高分散硝材
HRI-LD:高屈折率、低分散硝材
LRI-LD:低屈折率、低分散硝材
レンズL1 1.88 HRI
レンズL2 1.62 35
プリズム 1.88 HRI
レンズL3 1.62 53
レンズL4 1.51 64 LD
レンズL5 ≦1.9 18 HRI-HD
カバーガラスCG 1.88 HRI
実施例2に係る斜視対物光学系について説明する。実施例2の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.88 HRI
レンズL2 1.58 40
プリズム 1.76 71 HRI-LD
レンズL3 1.58 61 LD
レンズL4 1.51 64 LD
レンズL5 ≦1.9 18 HRI-HD
カバーガラスCG 1.88 HRI
実施例3に係る斜視対物光学系について説明する。実施例3の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.88 HRI
レンズL2 1.58 40
プリズム 1.51 64 LD
レンズL3 1.58 61 LD
レンズL4 1.51 64 LD
レンズL5 ≦1.9 18 HRI-HD
カバーガラスCG 1.88 HRI
実施例4に係る斜視対物光学系について説明する。実施例4の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.88 HRI
レンズL2 1.74 27
プリズム 1.51 64 LD
レンズL3 1.51 64 LD
レンズL4 1.48 70 LD
レンズL5 ≦1.9 18 HRI-HD
カバーガラスCG 1.88 HRI
実施例5に係る斜視対物光学系について説明する。実施例5の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.88 HRI
レンズL2 1.74 27
プリズム 1.51 64 LD
レンズL3 1.58 61 LD
レンズL4 1.51 64 LD
レンズL5 ≦1.9 18 HRI-HD
カバーガラスCG 1.51 LRI
実施例6に係る斜視対物光学系について説明する。実施例6の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.88 HRI
レンズL2 1.74 27
プリズム 1.51 64 LD
レンズL3 1.61 54 LD
レンズL4 1.51 64 LD
レンズL5 ≦1.9 18 HRI-HD
カバーガラスCG 1.51 LRI
実施例7に係る斜視対物光学系について説明する。実施例7の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.88 HRI
レンズL2 1.74 27
プリズム 1.51 64 LD
レンズL3 1.61 54 LD
レンズL4 1.51 64 LD
レンズL5 ≦1.9 18 HRI-HD
カバーガラスCG 1.51 LRI
実施例8に係る斜視対物光学系について説明する。実施例8の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.88 HRI
レンズL2 1.74 27
プリズム 1.8 40 HRI
レンズL3 1.61 54 LD
レンズL4 1.51 64 LD
レンズL5 ≦1.9 18 HRI-HD
カバーガラスCG 1.51 LRI
実施例9に係る斜視対物光学系について説明する。実施例9の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.88 HRI
レンズL2 1.74 27
プリズム 1.88 40 HRI
レンズL3 1.61 54 LD
レンズL4 1.51 64 LD
レンズL5 ≦1.9 18 HRI-HD
カバーガラスCG 1.88 HRI
実施例10に係る斜視対物光学系について説明する。実施例10の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.88 HRI
レンズL2 1.74 41
プリズム 1.51 64 LRI
レンズL3 1.62 53 LD
レンズL4 1.75 52 LD
レンズL5 ≦1.9 18 HRI-HD
カバーガラスCG 1.51 LRI
実施例11に係る斜視対物光学系について説明する。実施例11の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.88 HRI
レンズL2 1.7 41
プリズム 1.51 64 LRI
レンズL3 1.62 53 LD
レンズL4 1.75 52 LD
レンズL5 ≦1.9 18 HRI-HD
カバーガラスCG 1.51 LRI
実施例12に係る斜視対物光学系について説明する。実施例12の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.88 HRI
レンズL2 1.7 41
プリズム 1.8 40 HRI
レンズL3 1.62 53 LD
レンズL4 1.75 52 LD
レンズL5 ≦1.9 18 HRI-HD
カバーガラスCG 1.88 HRI
実施例13に係る斜視対物光学系について説明する。実施例13の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.76 HRI
レンズL2 1.58 61
レンズL3 1.53 48
プリズム 1.88 40 HRI
レンズL4 1.58 61 LD
レンズL5 1.72 54 LD
レンズL6 ≦1.9 18 HRI-HD
カバーガラスCG 1.88 HRI
実施例14に係る斜視対物光学系について説明する。実施例14の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.76 HRI
レンズL2 1.58 61
レンズL3 1.53 48
プリズム 1.8 40 HRI
レンズL4 1.72 54 LD
レンズL5 1.72 54 LD
レンズL6 ≦1.9 18 HRI-HD
カバーガラスCG 1.88 HRI
実施例15に係る斜視対物光学系について説明する。実施例15の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.88 HRI
レンズL2 1.58 61
レンズL3 1.53 48
プリズム 1.8 40 HRI
レンズL4 1.74 49
レンズL5 1.72 54 LD
レンズL6 ≦1.9 18 HRI-HD
カバーガラスCG 1.88 HRI
実施例16に係る斜視対物光学系について説明する。実施例16の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.88 HRI
レンズL2 1.58 61
レンズL3 1.58 40
プリズム 1.88 40 HRI
レンズL4 1.71 47 HRI
レンズL5 1.72 54 LD
レンズL6 ≦1.9 18 HRI-HD
カバーガラスCG 1.88 HRI
実施例17に係る斜視対物光学系について説明する。実施例17の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.88 HRI
レンズL2 1.58 61
レンズL3 1.54 45
プリズム 1.8 40 HRI
レンズL4 1.58 61 LD
レンズL5 1.75 52 HRI
レンズL6 ≦1.9 18 HRI-HD
カバーガラスCG 1.88 HRI
実施例18に係る斜視対物光学系について説明する。実施例18の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.88 HRI
レンズL2 1.58 61
レンズL3 1.54 45
プリズム 1.8 40 HRI
レンズL4 1.58 61 LD
レンズL5 1.75 52 HRI
レンズL6 ≦1.9 18 HRI-HD
カバーガラスCG 1.88 HRI
実施例19に係る斜視対物光学系について説明する。実施例19の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.88 HRI
レンズL2 1.58 61
レンズL3 1.54 45
プリズム 1.88 40 HRI
レンズL4 1.58 61 LD
レンズL5 1.75 52 HRI
レンズL6 ≦1.9 18 HRI-HD
カバーガラスCG 1.88 HRI
実施例20に係る斜視対物光学系について説明する。実施例20の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.51 64 LRI-LD
レンズL2 1.48 70 LRI-LD
プリズム 1.88 40 HRI
レンズL3 1.53 59 LD
レンズL4 1.51 64 LD
レンズL5 ≦1.9 18 HRI-HD
カバーガラスCG 1.88 HRI
実施例21に係る斜視対物光学系について説明する。実施例21の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.51 64 LRI-LD
レンズL2 1.48 70 LRI-LD
プリズム 1.51 64 LRI-LD
レンズL3 1.51 64 LD
レンズL4 1.51 64 LD
レンズL5 ≦1.9 18 HRI-HD
カバーガラスCG 1.88 HRI
実施例22に係る斜視対物光学系について説明する。実施例22の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.51 64 LRI-LD
レンズL2 1.51 64 LRI-LD
プリズム 1.51 64 LRI-LD
レンズL3 1.58 61 LD
レンズL4 1.51 64 LD
レンズL5 ≦1.9 18 HRI-HD
カバーガラスCG 1.51 64 LRI
実施例23に係る斜視対物光学系について説明する。実施例23の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.51 64 LRI-LD
レンズL2 1.51 64 LRI-LD
プリズム 1.51 64 LRI-LD
レンズL3 1.62 58 LD
レンズL4 1.51 64 LD
レンズL5 ≦1.9 18 HRI-HD
カバーガラスCG 1.51 64 LRI
実施例24に係る斜視対物光学系について説明する。実施例24の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.51 64 LRI-LD
レンズL2 1.48 70 LRI-LD
プリズム 1.51 64 LRI-LD
レンズL3 1.56 60 LD
レンズL4 1.51 64 LD
レンズL5 ≦1.9 18 HRI-HD
カバーガラスCG 1.88 40 HRI
実施例25に係る斜視対物光学系について説明する。実施例25の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.51 64 LRI-LD
レンズL2 1.51 64 LRI-LD
プリズム 1.51 64 LRI-LD
レンズL3 1.62 58 LD
レンズL4 1.54 59 LD
レンズL5 ≦1.9 18 HRI-HD
カバーガラスCG 1.51 64 LRI
実施例26に係る斜視対物光学系について説明する。実施例26の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.51 LRI
レンズL2 1.58 61
レンズL3 1.53 48
プリズム 1.51 64 LRI-LD
レンズL4 1.72 54 HRI-LD
レンズL5 1.58 61 LD
レンズL6 ≦1.9 18 HRI-HD
カバーガラスCG 1.51 LRI
実施例27に係る斜視対物光学系について説明する。実施例27の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.88 HRI
レンズL2 1.58 61
レンズL3 1.53 48
プリズム 1.51 64 LRI-LD
レンズL4 1.72 54 HRI-LD
レンズL5 1.58 61 LD
レンズL6 ≦1.9 18 HRI-HD
カバーガラスCG 1.51 LRI
実施例28に係る斜視対物光学系について説明する。実施例28の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.88 HRI
レンズL2 1.58 61
レンズL3 1.53 48
プリズム 1.51 64 LRI-LD
レンズL4 1.72 54 HRI-LD
レンズL5 1.72 54 LD
レンズL6 ≦1.9 18 HRI-HD
カバーガラスCG 1.51 LRI
実施例29に係る斜視対物光学系について説明する。実施例29の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.88 HRI
レンズL2 1.58 61
レンズL3 1.53 48
プリズム 1.51 64 LRI-LD
レンズL4 1.72 54 HRI-LD
レンズL5 1.75 52 HRI-LD
レンズL6 ≦1.9 18 HRI-HD
カバーガラスCG 1.88 HRI
実施例30に係る斜視対物光学系について説明する。実施例30の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.88 HRI
レンズL2 1.58 61
レンズL3 1.53 48
プリズム 1.8 40 HRI
レンズL4 1.72 54 HRI-LD
レンズL5 1.75 52 LD
レンズL6 ≦1.9 18 HRI-HD
カバーガラスCG 1.88 HRI
実施例31に係る斜視対物光学系について説明する。実施例31の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.51 64 LRI-LD
レンズL2 1.58 61
レンズL3 1.53 48
プリズム 1.51 64 LRI-LD
レンズL4 1.48 70 LD
レンズL5 1.58 61 LD
レンズL6 ≦1.9 18 HRI-HD
カバーガラスCG 1.51 LRI
実施例32に係る斜視対物光学系について説明する。実施例32の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.88 HRI
レンズL2 1.58 61
レンズL3 1.59 39
プリズム 1.88 40 HRI
レンズL4 1.71 47 HRI-LD
レンズL5 1.72 54 LD
レンズL6 ≦1.9 18 HRI-HD
カバーガラスCG 1.88 HRI
実施例33に係る斜視対物光学系について説明する。実施例33の斜視対物光学系は、物体側から順に、負の屈折力を有する前側レンズ群GFと、光路変換素子Pと、明るさ絞りSと、正の屈折力を有する後側レンズ群GRと、からなる。
レンズL1 1.88 HRI
レンズL2 1.74 27 HRI
プリズム 1.51 64 LRI-LD
レンズL3 1.61 54 HRI-LD
レンズL4 1.51 64 LD
レンズL5 ≦1.9 18 HRI-HD
カバーガラスCG 1.51 LRI
単位 mm
面データ
面番号 r d nd νd
1 ∞ 0.5062 1.88300 40.76
2 1.3194 0.7749
3 -69.5360 1.0234 1.62588 35.70
4 -4.4939 0.2531
5 ∞ 3.0374 1.88300 40.76
6 ∞ 0.0000
7(絞り) ∞ 0.3037
8 8.7102 0.8155 1.62230 53.17
9 -2.8173 0.0943
10 ∞ 0.6750 1.49400 75.00
11 ∞ 0.1687
12 1.6635 1.3899 1.51633 64.14
13 -1.7043 0.5062 1.92286 18.90
14 -12.2064 0.6059
15 ∞ 0.5062 1.88300 40.76
16 ∞ 0.0169 1.51300 64.00
17 ∞ 0.5906 1.50510 63.26
18 ∞ 0.0000
(像面)
各種データ
IH 0.766
ω 49.93
Fno 2.935
f 1
D1 1.866
D2 1.278
L 11.268
|fF| 2.43
fR 2.149
|f1| 1.494
νd(L2) 35.7
単位 mm
面データ
面番号 r d nd νd
1 ∞ 0.5192 1.88300 40.76
2 1.2301 1.2236
3 -2.4328 0.6352 1.58144 40.75
4 -2.0468 0.2596
5 ∞ 3.1153 1.76820 71.79
6 ∞ 0.0000
7(絞り) ∞ 0.3115
8 7.8933 0.8839 1.58913 61.14
9 -3.3555 0.0967
10 ∞ 0.6923 1.49400 75.00
11 ∞ 0.1731
12 2.0108 2.0624 1.51633 64.14
13 -1.4835 0.5192 1.92286 18.90
14 -7.0564 0.7632
15 ∞ 0.5192 1.88300 40.76
16 ∞ 0.0173 1.51300 64.00
17 ∞ 0.6058 1.50510 63.26
18 ∞ 0.0000
(像面)
各種データ
IH 0.786
ω 49.901
Fno 2.913
f 1
D1 2.021
D2 1.453
L 12.398
|fF| 2
fR 2.476
|f1| 1.393
νd(L2) 40.75
単位 mm
面データ
面番号 r d nd νd
1 ∞ 0.5183 1.88300 40.76
2 1.2902 1.0754
3 -2.7566 0.7775 1.58144 40.75
4 -2.3756 0.2592
5 ∞ 3.1100 1.51633 64.14
6 ∞ 0.0000
7(絞り) ∞ 0.3110
8 7.8819 0.8621 1.58913 61.14
9 -3.4604 0.0966
10 ∞ 0.6911 1.49400 75.00
11 ∞ 0.1728
12 1.9654 2.0894 1.51633 64.14
13 -1.4850 0.5183 1.92286 18.90
14 -8.2062 0.7483
15 ∞ 0.5183 1.88300 40.76
16 ∞ 0.0173 1.51300 64.00
17 ∞ 0.6047 1.50510 63.26
18 ∞ 0.0000
(像面)
各種データ
IH 0.784
ω 49.912
Fno 2.959
f 1
D1 2.31
D2 1.437
L 12.37
|fF| 2.003
fR 2.473
|f1| 1.461
νd(L2) 40.75
単位 mm
面データ
面番号 r d nd νd
1 ∞ 0.5139 1.88300 40.76
2 1.3854 0.8379
3 -6.3453 1.1330 1.74077 27.79
4 -3.8981 0.1713
5 ∞ 3.0835 1.51633 64.14
6 ∞ 0.0000
7(絞り) ∞ 0.3083
8 7.6238 0.8543 1.51633 64.14
9 -2.9335 0.0958
10 ∞ 0.6852 1.49400 75.00
11 ∞ 0.1713
12 1.8790 1.8426 1.48749 70.23
13 -1.5314 0.5139 1.92286 18.90
14 -4.1089 0.7559
15 ∞ 0.5139 1.88300 40.76
16 ∞ 0.0171 1.51300 64.00
17 ∞ 0.5996 1.50510 63.26
18 ∞ 0.0000
(像面)
各種データ
IH 0.778
ω 49.914
Fno 2.969
f 1
D1 2.205
D2 1.439
L 12.098
|fF| 2.359
fR 2.469
|f1| 1.569
νd(L2) 27.79
単位 mm
面データ
面番号 r d nd νd
1 ∞ 0.5716 1.88300 40.76
2 1.4865 1.3095
3 -5.4021 0.7246 1.74077 27.79
4 -3.8365 0.2858
5 ∞ 3.4293 1.51633 64.14
6 ∞ 0.0000
7(絞り) ∞ 0.3429
8 8.0445 1.0374 1.58913 61.14
9 -3.6908 0.1065
10 ∞ 0.7621 1.49400 75.00
11 ∞ 0.1905
12 2.0697 1.8351 1.51633 64.14
13 -1.7932 0.5716 1.92286 18.90
14 -6.0848 0.7025
15 ∞ 0.6287 1.51633 64.14
16 ∞ 0.0191 1.51300 64.00
17 ∞ 0.6668 1.50510 63.26
18 ∞ 0.0000
(像面)
各種データ
IH 0.77
ω 49.885
Fno 2.954
f 1
D1 2.547
D2 1.573
L 13.184
|fF| 2.341
fR 2.622
|f1| 1.683
νd(L2) 27.79
単位 mm
面データ
面番号 r d nd νd
1 ∞ 0.5570 1.88300 40.76
2 1.4967 1.3302
3 27.8259 0.6536 1.74077 27.79
4 -9.9577 0.2785
5 ∞ 3.3419 1.51633 64.14
6 ∞ 0.0000
7(絞り) ∞ 0.3342
8 17.6150 0.8477 1.61405 54.99
9 -3.1277 0.1038
10 ∞ 0.7427 1.49400 75.00
11 ∞ 0.1857
12 1.7287 1.6032 1.51633 64.14
13 -1.7376 0.5570 1.92286 18.90
14 -8.7562 0.6416
15 ∞ 0.5570 1.51633 64.14
16 ∞ 0.0186 1.51300 64.00
17 ∞ 0.6498 1.50510 63.26
18 ∞ 0.0000
(像面)
各種データ
IH 0.75
ω 49.917
Fno 2.805
f 1
D1 2.482
D2 1.453
L 12.402
|fF| 2.535
fR 2.406
|f1| 1.695
νd(L2) 27.79
単位 mm
面データ
面番号 r d nd νd
1 ∞ 0.5612 1.88300 40.76
2 1.4828 0.7761
3 -81.7714 1.2159 1.74077 27.79
4 -7.2782 0.2806
5 ∞ 3.3672 1.51633 64.14
6 ∞ 0.0000
7(絞り) ∞ 0.3367
8 10.1814 0.8947 1.61405 54.99
9 -3.2206 0.1046
10 ∞ 0.7483 1.49400 75.00
11 ∞ 0.1871
12 1.7951 1.5299 1.51633 64.14
13 -1.8511 0.5612 1.92286 18.90
14 -8.4511 0.6480
15 ∞ 0.5612 1.51633 64.14
16 ∞ 0.0187 1.51300 64.00
17 ∞ 0.6547 1.50510 63.26
18 ∞ 0.0000
(像面)
各種データ
IH 0.756
ω 49.91
Fno 2.748
f 1
D1 2.501
D2 1.466
L 12.446
|fF| 2.4
fR 2.376
|f1| 1.679
νd(L2) 27.79
単位 mm
面データ
面番号 r d nd νd
1 ∞ 0.5648 1.88300 40.76
2 1.4260 0.7849
3 -50.1550 1.2236 1.74077 27.79
4 -6.3567 0.2824
5 ∞ 3.3885 1.80610 40.92
6 ∞ 0.0000
7(絞り) ∞ 0.3389
8 9.9395 0.8913 1.61405 54.99
9 -3.0645 0.1052
10 ∞ 0.7530 1.49400 75.00
11 ∞ 0.1883
12 1.8206 1.4188 1.51633 64.14
13 -1.9127 0.5648 1.92286 18.90
14 -7.5390 0.6575
15 ∞ 0.5648 1.51633 64.14
16 ∞ 0.0188 1.51300 64.00
17 ∞ 0.6589 1.50510 63.26
18 ∞ 0.0000
(像面)
各種データ
IH 0.761
ω 49.928
Fno 2.785
f 1
D1 2.159
D2 1.48
L 12.404
|fF| 2.407
fR 2.336
|f1| 1.615
νd(L2) 27.79
単位 mm
面データ
面番号 r d nd νd
1 ∞ 0.5652 1.88300 40.76
2 1.4209 0.7867
3 -43.7553 1.2247 1.74077 27.79
4 -5.8565 0.2826
5 ∞ 3.3913 1.88300 40.76
6 ∞ 0.0000
7(絞り) ∞ 0.3391
8 9.2500 0.8969 1.61405 54.99
9 -3.0400 0.1053
10 ∞ 0.7536 1.49400 75.00
11 ∞ 0.1884
12 1.7914 1.3681 1.51633 64.14
13 -1.9111 0.5652 1.92286 18.90
14 -7.8580 0.6773
15 ∞ 0.5652 1.88300 40.76
16 ∞ 0.0188 1.51300 64.00
17 ∞ 0.6594 1.50510 63.26
18 ∞ 0.0000
(像面)
各種データ
IH 0.761
ω 49.932
Fno 2.884
f 1
D1 2.084
D2 1.428
L 12.388
|fF| 2.495
fR 2.307
|f1| 1.609
νd(L2) 27.79
単位 mm
面データ
面番号 r d nd νd
1 ∞ 0.6524 1.88300 40.76
2 1.6794 1.5882
3 -4.3655 0.8310 1.70154 41.24
4 -3.7554 0.2175
5 ∞ 3.9145 1.51633 64.14
6 ∞ 0.0000
7(絞り) ∞ 0.3915
8 9.6178 0.9462 1.62230 53.17
9 -4.9574 0.1087
10 ∞ 0.8699 1.49400 75.00
11 ∞ 0.2175
12 3.2222 2.5044 1.75500 52.32
13 -1.7773 0.6524 1.92286 18.90
14 -13.5540 0.6209
15 ∞ 0.6524 1.51633 64.14
16 ∞ 0.0217 1.51300 64.00
17 ∞ 0.7612 1.50510 63.26
18 ∞ 0.0000
(像面)
各種データ
IH 0.879
ω 59.849
Fno 2.847
f 1
D1 2.799
D2 1.571
L 14.95
|fF| 2.481
fR 2.805
|f1| 1.902
νd(L2) 41.24
単位 mm
面データ
面番号 r d nd νd
1 ∞ 0.7039 1.88300 40.76
2 1.7723 1.8532
3 -4.1698 0.7591 1.70154 41.24
4 -3.6874 0.2346
5 ∞ 4.2234 1.51633 64.14
6 ∞ 0.0000
7(絞り) ∞ 0.4223
8 10.7127 1.1361 1.62230 53.17
9 -5.2256 0.1173
10 ∞ 0.9385 1.49400 75.00
11 ∞ 0.2346
12 3.1601 2.6022 1.75500 52.32
13 -1.8834 0.7039 1.92286 18.90
14 -21.7315 0.5068
15 ∞ 0.7039 1.51633 64.14
16 ∞ 0.0235 1.51300 64.00
17 ∞ 0.8212 1.50510 63.26
18 ∞ 0.0000
(像面)
各種データ
IH 0.948
ω 69.755
Fno 2.977
f 1
D1 3.02
D2 1.532
L 15.985
|fF| 2.59
fR 2.907
|f1| 2.007
νd(L2) 41.24
単位 mm
面データ
面番号 r d nd νd
1 ∞ 0.7058 1.88300 40.76
2 1.7114 1.8865
3 -4.3112 0.7460 1.70154 41.24
4 -3.7270 0.2353
5 ∞ 4.2349 1.80610 40.92
6 ∞ 0.0000
7(絞り) ∞ 0.4235
8 10.3467 1.1767 1.62230 53.17
9 -4.8423 0.1176
10 ∞ 0.9411 1.49400 75.00
11 ∞ 0.2353
12 3.1648 2.5823 1.75500 52.32
13 -1.8865 0.7058 1.92286 18.90
14 -20.6467 0.5212
15 ∞ 0.7058 1.88300 40.76
16 ∞ 0.0235 1.51300 64.00
17 ∞ 0.8235 1.50510 63.26
18 ∞ 0.0000
(像面)
各種データ
IH 0.951
ω 69.779
Fno 2.891
f 1
D1 2.58
D2 1.459
L 16.065
|fF| 2.522
fR 2.839
|f1| 1.938
νd(L2) 41.24
単位 mm
面データ
面番号 r d nd νd
1 ∞ 0.9676 1.76820 71.79
2 1.5597 2.1057
3 -3.1361 0.8064 1.58913 61.14
4 -5.1221 1.1289 1.53172 48.84
5 -2.7614 0.0599
6 ∞ 5.8059 1.80610 40.92
7 ∞ 0.0000
8(絞り) ∞ 0.5806
9 70.8526 1.4477 1.58913 61.14
10 -5.1448 0.2580
11 ∞ 1.2902 1.49400 75.00
12 ∞ 0.0968
13 4.0515 2.5531 1.72916 54.68
14 -2.7894 0.9676 1.92286 18.90
15 -9.9702 0.8135
16 ∞ 0.9676 1.88300 40.76
17 ∞ 0.0323 1.51300 64.00
18 ∞ 1.1289 1.50510 63.26
19 ∞ 0.0000
(像面)
各種データ
IH 0.764
ω 49.988
Fno 2.91
f 1
D1 3.275
D2 2.099
L 21.011
|fF| 4.01
fR 3.668
|f1| 2.03
単位 mm
面データ
面番号 r d nd νd
1 ∞ 0.9733 1.76820 71.79
2 1.4955 1.7058
3 -2.9530 0.8111 1.58913 61.14
4 -9.2593 1.4600 1.53172 48.84
5 -2.7583 0.0768
6 ∞ 5.8399 1.80610 40.92
7 ∞ 0.0000
8(絞り) ∞ 0.5840
9 188.4216 1.7096 1.72916 54.68
10 -6.3042 0.2596
11 ∞ 1.2978 1.49400 75.00
12 ∞ 0.0973
13 4.0875 2.6251 1.72916 54.68
14 -2.7601 1.0382 1.92286 18.90
15 -10.8193 0.8820
16 ∞ 0.9733 1.88300 40.76
17 ∞ 0.0324 1.51300 64.00
18 ∞ 1.1355 1.50510 63.26
19 ∞ 0.0000
(像面)
各種データ
IH 0.769
ω 50
Fno 2.978
f 1
D1 3.31
D2 2.175
L 21.502
|fF| 3.788
fR 3.754
|f1| 1.947
単位 mm
面データ
面番号 r d nd νd
1 ∞ 0.9810 1.88300 40.76
2 1.5515 1.6149
3 -3.2685 0.8175 1.58913 61.14
4 -11.3393 1.4716 1.53172 48.84
5 -2.7957 0.0942
6 ∞ 5.8863 1.80610 40.92
7 ∞ 0.0000
8(絞り) ∞ 0.5886
9 142.1161 1.7757 1.74320 49.34
10 -6.5604 0.2616
11 ∞ 1.3081 1.49400 75.00
12 ∞ 0.0981
13 4.2497 2.7058 1.72916 54.68
14 -2.7222 1.0465 1.92286 18.90
15 -11.1714 1.0170
16 ∞ 0.9810 1.88300 40.76
17 ∞ 0.0327 1.51300 64.00
18 ∞ 1.1446 1.50510 63.26
19 ∞ 0.0000
(像面)
各種データ
IH 0.775
ω 50
Fno 2.943
f 1
D1 3.353
D2 2.32
L 21.825
|fF| 3.528
fR 3.874
|f1| 1.757
単位 mm
面データ
面番号 r d nd νd
1 ∞ 0.9763 1.88300 40.76
2 1.8323 1.7507
3 -3.5431 0.8136 1.58913 61.14
4 36.3604 1.3440 1.58144 40.75
5 -3.7537 0.0911
6 ∞ 5.8579 1.88300 40.76
7 ∞ 0.0000
8(絞り) ∞ 0.5858
9 255.3489 2.2080 1.71700 47.92
10 -6.0825 0.2604
11 ∞ 1.3018 1.49400 75.00
12 ∞ 0.0976
13 4.0474 2.8067 1.72916 54.68
14 -2.6506 0.9763 1.92286 18.90
15 -10.7949 1.0357
16 ∞ 0.9763 1.88300 40.76
17 ∞ 0.0325 1.51300 64.00
18 ∞ 1.1390 1.50510 63.26
19 ∞ 0.0000
(像面)
各種データ
IH 0.771
ω 49.999
Fno 2.81
f 1
D1 3.202
D2 2.333
L 22.254
|fF| 2.968
fR 3.737
|f1| 2.075
単位 mm
面データ
面番号 r d nd νd
1 ∞ 1.0922 1.88300 40.76
2 1.6793 2.3721
3 -3.0453 0.9102 1.58913 61.14
4 -12.8380 1.3271 1.54814 45.79
5 -3.0049 0.0236
6 ∞ 6.5535 1.80610 40.92
7 ∞ 0.0000
8(絞り) ∞ 0.6553
9 35.1593 1.9478 1.58913 61.14
10 -7.7012 0.2913
11 ∞ 1.4563 1.49400 75.00
12 ∞ 0.1092
13 4.4231 3.7637 1.75500 52.32
14 -2.6317 1.0922 1.92286 18.90
15 -13.0401 0.7946
16 ∞ 1.0922 1.88300 40.76
17 ∞ 0.0364 1.51300 64.00
18 ∞ 1.2743 1.50510 63.26
19 ∞ 0.0000
(像面)
各種データ
IH 0.863
ω 60
Fno 2.936
f 1
D1 3.652
D2 2.245
L 24.792
|fF| 3.419
fR 4.327
|f1| 1.902
単位 mm
面データ
面番号 r d nd νd
1 ∞ 1.1926 1.88300 40.76
2 1.8627 2.4500
3 -3.0179 0.9938 1.58913 61.14
4 -27.9725 1.2403 1.54814 45.79
5 -3.1399 0.1988
6 ∞ 7.1554 1.80610 40.92
7 ∞ 0.0000
8(絞り) ∞ 0.7155
9 21.1481 2.4670 1.58913 61.14
10 -8.1016 0.3180
11 ∞ 1.5901 1.49400 75.00
12 ∞ 0.1193
13 4.9099 3.5777 1.75500 52.32
14 -2.6387 1.1131 1.92286 18.90
15 -9.5801 0.8340
16 ∞ 1.1926 1.88300 40.76
17 ∞ 0.0398 1.51300 64.00
18 ∞ 1.3913 1.50510 63.26
19 ∞ 0.0000
(像面)
各種データ
IH 0.942
ω 70.033
Fno 2.797
f 1
D1 4.161
D2 2.418
L 26.589
|fF| 3.424
fR 4.491
|f1| 2.11
単位 mm
面データ
面番号 r d nd νd
1 ∞ 1.2193 1.88300 40.76
2 1.8883 2.5516
3 -2.8986 1.0161 1.58913 61.14
4 68.5175 1.2912 1.54814 45.79
5 -3.2174 0.2032
6 ∞ 7.3158 1.88300 40.76
7 ∞ 0.0000
8(絞り) ∞ 0.7316
9 24.1646 2.6992 1.58913 61.14
10 -8.6042 0.3251
11 ∞ 1.6257 1.49400 75.00
12 ∞ 0.1219
13 5.3247 3.8611 1.75500 52.32
14 -2.7178 1.2193 1.92286 18.90
15 -8.4132 1.0584
16 ∞ 1.2193 1.88300 40.76
17 ∞ 0.0406 1.51300 64.00
18 ∞ 1.4225 1.50510 63.26
19 ∞ 0.0000
(像面)
各種データ
IH 0.963
ω 75
Fno 2.972
f 1
D1 4.088
D2 2.678
L 27.922
|fF| 3.206
fR 4.737
|f1| 2.139
単位 mm
面データ
面番号 r d nd νd
1 ∞ 0.5057 1.51633 64.14
2 1.1020 0.8409
3 -2.8069 0.9920 1.48749 70.23
4 -3.4857 0.2529
5 ∞ 3.0343 1.88300 40.76
6 ∞ 0.0000
7(絞り) ∞ 0.3034
8 8.0661 0.8963 1.53996 59.46
9 -2.7079 0.0942
10 ∞ 0.6743 1.49400 75.00
11 ∞ 0.1686
12 1.9196 1.7549 1.51633 64.14
13 -1.5319 0.5057 1.92286 18.90
14 -3.8070 0.6942
15 ∞ 0.5057 1.88300 40.76
16 ∞ 0.0169 1.51300 64.00
17 ∞ 0.5900 1.50510 63.26
18 ∞ 0.0000
(像面)
各種データ
IH 0.765
ω 49.95
Fno 2.91
f 1
D1 1.864
D2 1.366
L 11.83
|fF| 2.225
fR 2.293
|f1| 2.134
νd(L2) 70.23
単位 mm
面データ
面番号 r d nd νd
1 ∞ 0.4976 1.51633 64.14
2 1.1610 1.2278
3 -1.7619 0.6556 1.48749 70.23
4 -2.0605 0.1659
5 ∞ 2.9858 1.51633 64.14
6 ∞ 0.0000
7(絞り) ∞ 0.2986
8 6.4367 0.8348 1.51633 64.14
9 -3.0351 0.0927
10 ∞ 0.6635 1.49400 75.00
11 ∞ 0.1659
12 1.8818 1.8151 1.51633 64.14
13 -1.4895 0.4976 1.92286 18.90
14 -4.0348 0.6762
15 ∞ 0.4976 1.88300 40.76
16 ∞ 0.0166 1.51300 64.00
17 ∞ 0.5806 1.50510 63.26
18 ∞ 0.0000
(像面)
各種データ
IH 0.753
ω 49.946
Fno 2.973
f 1
D1 2.135
D2 1.337
L 11.672
|fF| 2.405
fR 2.356
|f1| 2.249
νd(L2) 70.23
単位 mm
面データ
面番号 r d nd νd
1 ∞ 0.5602 1.51633 64.14
2 1.1547 1.0724
3 -1.9181 0.9124 1.51633 64.14
4 -2.2743 0.2801
5 ∞ 3.3614 1.51633 64.14
6 ∞ 0.0000
7(絞り) ∞ 0.3361
8 7.1862 0.9594 1.58913 61.14
9 -3.5738 0.1044
10 ∞ 0.7470 1.49400 75.00
11 ∞ 0.1867
12 1.8467 1.4511 1.51633 64.14
13 -1.8306 0.5602 1.92286 18.90
14 -7.1502 0.6907
15 ∞ 0.6163 1.51633 64.14
16 ∞ 0.0187 1.51300 64.00
17 ∞ 0.6536 1.50510 63.26
18 ∞ 0.0000
(像面)
各種データ
IH 0.754
ω 50.424
Fno 3.226
f 1
D1 2.497
D2 1.544
L 12.511
|fF| 2.538
fR 2.458
|f1| 2.236
νd(L2) 64.14
単位 mm
面データ
面番号 r d nd νd
1 ∞ 0.5584 1.51633 64.14
2 1.2161 1.1444
3 -2.2766 0.8457 1.51633 64.14
4 -2.6096 0.2792
5 ∞ 3.3502 1.51633 64.14
6 ∞ 0.0000
7(絞り) ∞ 0.3350
8 7.4115 0.9358 1.62299 58.16
9 -3.6548 0.1040
10 ∞ 0.7445 1.49400 75.00
11 ∞ 0.1861
12 1.9692 1.4314 1.51633 64.14
13 -1.8620 0.5584 1.92286 18.90
14 -5.3473 0.6787
15 ∞ 0.6142 1.51633 64.14
16 ∞ 0.0186 1.51300 64.00
17 ∞ 0.6514 1.50510 63.26
18 ∞ 0.0000
(像面)
各種データ
IH 0.752
ω 49.927
Fno 2.89
f 1
D1 2.489
D2 1.529
L 12.436
|fF| 2.607
fR 2.434
|f1| 2.355
νd(L2) 64.14
単位 mm
面データ
面番号 r d nd νd
1 ∞ 0.9985 1.51633 64.14
2 2.0780 2.1397
3 -2.1807 1.6323 1.48749 70.23
4 -21.4579 0.3328
5 ∞ 5.9913 1.51633 64.14
6 ∞ 0.0000
7(絞り) ∞ 0.5991
8 14.6278 2.4643 1.56384 60.67
9 -5.6190 0.1664
10 ∞ 1.3314 1.49400 75.00
11 ∞ 0.3328
12 3.0359 2.6436 1.51633 64.14
13 -2.7137 0.9985 1.92286 18.90
14 -6.3416 1.6851
15 ∞ 0.9985 1.88300 40.76
16 ∞ 0.0333 1.51300 64.00
17 ∞ 1.1650 1.50510 63.26
18 ∞ 0.0000
(像面)
各種データ
IH 0.789
ω 59.815
Fno 2.952
f 1
D1 4.284
D2 3.011
L 23.513
|fF| 1.847
fR 4.107
|f1| 4.025
νd(L2) 70.23
単位 mm
面データ
面番号 r d nd νd
1 ∞ 0.6620 1.51825 64.14
2 1.4171 1.6872
3 -2.3903 0.8845 1.51825 64.14
4 -3.5608 0.1103
5 ∞ 3.9719 1.51825 64.14
6 ∞ 0.0000
7(絞り) ∞ 0.3972
8 10.9867 1.0974 1.62555 58.16
9 -4.2262 0.1233
10 ∞ 0.8826 1.49557 75.00
11 ∞ 0.2207
12 2.3035 1.8323 1.54212 59.46
13 -1.9842 0.6620 1.93429 18.90
14 -4.7958 0.7844
15 ∞ 0.7282 1.51825 64.14
16 ∞ 0.0221 1.51500 64.00
17 ∞ 0.7723 1.50700 63.26
18 ∞ 0.0000
(像面)
各種データ
IH 0.891
ω 70
Fno 2.91
f 1
D1 2.726
D2 1.791
L 14.838
|fF| 2.38
fR 2.781
|f1| 2.734
νd(L2) 64.14
単位 mm
面データ
面番号 r d nd νd
1 ∞ 0.9231 1.51633 64.14
2 1.6681 1.8315
3 -2.2544 0.9231 1.58913 61.14
4 -10.7875 0.9231 1.53172 48.84
5 -3.7817 0.1099
6 ∞ 5.5388 1.51633 64.14
7 ∞ 0.0000
8(絞り) ∞ 0.5539
9 25.5699 1.9391 1.72916 54.68
10 -5.9517 0.4000
11 ∞ 1.2308 1.49400 75.00
12 ∞ 0.0923
13 3.0306 2.5105 1.58913 61.14
14 -2.8577 0.9231 1.92286 18.90
15 -7.6560 0.5475
16 ∞ 1.0154 1.51633 64.14
17 ∞ 0.0308 1.51300 64.00
18 ∞ 1.0770 1.50510 63.26
19 ∞ 0.0000
(像面)
各種データ
IH 0.729
ω 49.996
Fno 2.489
f 1
D1 3.763
D2 1.953
L 20.57
|fF| 2.707
fR 3.526
|f1| 3.231
単位 mm
面データ
面番号 r d nd νd
1 ∞ 0.9372 1.88300 40.76
2 2.4472 1.9660
3 -1.9633 0.7810 1.58913 61.14
4 -22.1376 1.0934 1.53172 48.84
5 -3.5969 0.0708
6 ∞ 5.6232 1.51633 64.14
7 ∞ 0.0000
8(絞り) ∞ 0.5623
9 10.4450 2.4566 1.72916 54.68
10 -9.4629 0.2499
11 ∞ 1.2496 1.49400 75.00
12 ∞ 0.0937
13 3.5658 2.9714 1.58913 61.14
14 -2.4471 0.7810 1.92286 18.90
15 -6.4505 1.1303
16 ∞ 0.9372 1.51633 64.14
17 ∞ 0.0312 1.51300 64.00
18 ∞ 1.0934 1.50510 63.26
19 ∞ 0.0000
(像面)
各種データ
IH 0.74
ω 50.005
Fno 2.895
f 1
D1 3.779
D2 2.495
L 22.028
|fF| 2.172
fR 4.01
|f1| 2.772
単位 mm
面データ
面番号 r d nd νd
1 ∞ 0.9703 1.88300 40.76
2 1.9374 1.9951
3 -2.7169 0.8086 1.58913 61.14
4 -14.7411 1.1320 1.53172 48.84
5 -3.4923 0.0855
6 ∞ 5.8217 1.51633 64.14
7 ∞ 0.0000
8(絞り) ∞ 0.5822
9 21.2486 2.1947 1.72916 54.68
10 -8.2644 0.2587
11 ∞ 1.2937 1.49400 75.00
12 ∞ 0.0970
13 4.5944 3.4743 1.72916 54.68
14 -2.6083 0.8086 1.92286 18.90
15 -10.2363 1.1721
16 ∞ 0.9703 1.51633 64.14
17 ∞ 0.0323 1.51300 64.00
18 ∞ 1.1320 1.50510 63.26
19 ∞ 0.0000
(像面)
各種データ
IH 0.767
ω 50.001
Fno 2.851
f 1
D1 3.925
D2 2.585
L 22.829
|fF| 2.465
fR 4.099
|f1| 2.194
単位 mm
面データ
面番号 r d nd νd
1 ∞ 0.9732 1.88300 40.76
2 1.9571 1.9435
3 -2.9974 0.8110 1.58913 61.14
4 -13.7469 1.1355 1.53172 48.84
5 -3.4767 0.0935
6 ∞ 5.8395 1.51633 64.14
7 ∞ 0.0000
8(絞り) ∞ 0.5839
9 55.9845 2.7878 1.72916 54.68
10 -7.3251 0.2595
11 ∞ 1.2977 1.49400 75.00
12 ∞ 0.0973
13 4.6802 3.6626 1.75500 52.32
14 -2.6170 0.8110 1.92286 18.90
15 -10.9745 1.1821
16 ∞ 0.9732 1.88300 40.76
17 ∞ 0.0324 1.51300 64.00
18 ∞ 1.1355 1.50510 63.26
19 ∞ 0.0000
(像面)
各種データ
IH 0.769
ω 50
Fno 2.697
f 1
D1 3.945
D2 2.475
L 23.619
|fF| 2.721
fR 4.079
|f1| 2.216
単位 mm
面データ
面番号 r d nd νd
1 ∞ 0.9725 1.88300 40.76
2 1.9111 1.9861
3 -2.9855 0.8104 1.58913 61.14
4 -14.5063 1.1345 1.53172 48.84
5 -3.5537 0.0903
6 ∞ 5.8347 1.80610 40.92
7 ∞ 0.0000
8(絞り) ∞ 0.5835
9 51.3462 2.8547 1.72916 54.68
10 -7.0255 0.2593
11 ∞ 1.2966 1.49400 75.00
12 ∞ 0.0972
13 4.6055 3.5917 1.75500 52.32
14 -2.6216 0.8104 1.92286 18.90
15 -11.2717 1.1627
16 ∞ 0.9725 1.88300 40.76
17 ∞ 0.0324 1.51300 64.00
18 ∞ 1.1345 1.50510 63.26
19 ∞ 0.0000
(像面)
各種データ
IH 0.768
ω 50
Fno 2.868
f 1
D1 3.321
D2 2.454
L 23.624
|fF| 2.577
fR 3.998
|f1| 2.164
単位 mm
面データ
面番号 r d nd νd
1 ∞ 0.9226 1.51633 64.14
2 1.7069 1.7909
3 -2.1879 0.7689 1.58913 61.14
4 -23.0503 1.0764 1.53172 48.84
5 -3.7068 0.1922
6 ∞ 5.5357 1.51633 64.14
7 ∞ 0.0000
8(絞り) ∞ 0.5536
9 15.9443 1.8848 1.48749 70.23
10 -4.1174 0.2460
11 ∞ 1.2302 1.49400 75.00
12 ∞ 0.0923
13 3.0881 2.5677 1.58913 61.14
14 -2.6929 0.7689 1.92286 18.90
15 -7.3328 0.7351
16 ∞ 0.9226 1.51633 64.14
17 ∞ 0.0308 1.51300 64.00
18 ∞ 1.0764 1.50510 63.26
19 ∞ 0.0000
(像面)
各種データ
IH 0.729
ω 50
Fno 2.968
f 1
D1 3.843
D2 2.079
L 20.395
|fF| 2.702
fR 3.528
|f1| 3.306
単位 mm
面データ
面番号 r d nd νd
1 ∞ 0.9737 1.88300 40.76
2 1.9496 1.7057
3 -4.0191 0.8114 1.58913 61.14
4 8.4542 1.3523 1.59551 39.24
5 -4.9365 0.0951
6 ∞ 5.8420 1.88300 40.76
7 ∞ 0.0000
8(絞り) ∞ 0.5842
9 67.4510 2.5304 1.71700 47.92
10 -6.2916 0.2596
11 ∞ 1.2982 1.49400 75.00
12 ∞ 0.0974
13 3.9748 2.8533 1.72916 54.68
14 -2.6289 0.9737 1.92286 18.90
15 -11.2155 1.0871
16 ∞ 0.9737 1.88300 40.76
17 ∞ 0.0325 1.51300 64.00
18 ∞ 1.1359 1.50510 63.26
19 ∞ 0.0000
(像面)
各種データ
IH 0.769
ω 50
Fno 2.789
f 1
D1 3.198
D2 2.38
L 22.606
|fF| 2.627
fR 3.722
|f1| 2.208
単位 mm
面データ
面番号 r d nd νd
1 ∞ 0.5611 1.88300 40.76
2 1.4627 0.7714
3 ∞ 1.2157 1.74077 27.79
4 -7.7008 0.2806
5 ∞ 3.3666 1.51633 64.14
6 ∞ 0.0000
7(絞り) ∞ 0.3367
8 10.1391 0.8213 1.61405 54.99
9 -3.0652 0.1046
10 ∞ 0.7481 1.49400 75.00
11 ∞ 0.1870
12 1.7777 1.5695 1.51633 64.14
13 -1.8580 0.5611 1.92286 18.90
14 -11.7188 0.5528
15 ∞ 0.5611 1.51633 64.14
16 ∞ 0.0187 1.51300 64.00
17 ∞ 0.6546 1.50510 63.26
18 ∞ 0.0000
(像面)
各種データ
IH 0.756
ω 49.904
Fno 2.764
f 1
D1 2.501
D2 1.37
L 12.311
|fF| 2.369
fR 2.327
|f1| 1.657
νd(L2) 27.79
実施例1 実施例2 実施例3 実施例4
(1)D1/f 1.866 2.021 2.31 2.205
(2)D2/f 1.278 1.453 1.437 1.439
(3)L/f 11.268 12.398 12.37 12.098
(4)D1/D2 1.46 1.391 1.608 1.533
(5)|fF/f| 2.43 2 2.003 2.359
(6)fR/f 2.149 2.476 2.473 2.469
(7)|f1/f| 1.494 1.393 1.461 1.569
(8)|f1/f2| 0.196 0.101 0.087 0.138
(9)|nd(L2f)-nd(L2b)| - - - -
実施例5 実施例6 実施例7 実施例8
(1)D1/f 2.547 2.482 2.501 2.159
(2)D2/f 1.573 1.453 1.466 1.48
(3)L/f 13.184 12.402 12.446 12.404
(4)D1/D2 1.62 1.709 1.707 1.458
(5)|fF/f| 2.341 2.535 2.4 2.407
(6)fR/f 2.622 2.406 2.376 2.336
(7)|f1/f| 1.683 1.695 1.679 1.615
(8)|f1/f2| 0.113 0.17 0.157 0.166
(9)|nd(L2f)-nd(L2b)| - - - -
実施例9 実施例10 実施例11 実施例12
(1)D1/f 2.084 2.799 3.02 2.58
(2)D2/f 1.428 1.571 1.532 1.459
(3)L/f 12.388 14.95 15.985 16.065
(4)D1/D2 1.459 1.781 1.971 1.769
(5)|fF/f| 2.495 2.481 2.59 2.522
(6)fR/f 2.307 2.805 2.907 2.839
(7)|f1/f| 1.609 1.902 2.007 1.938
(8)|f1/f2| 0.179 0.078 0.073 0.075
(9)|nd(L2f)-nd(L2b)| - - - -
実施例13 実施例14 実施例15 実施例16
(1)D1/f 3.275 3.31 3.353 3.202
(2)D2/f 2.099 2.175 2.32 2.333
(3)L/f 21.011 21.502 21.825 22.254
(4)D1/D2 1.56 1.522 1.445 1.373
(5)|fF/f| 4.01 3.788 3.528 2.968
(6)fR/f 3.668 3.754 3.874 3.737
(7)|f1/f| 2.03 1.947 1.757 2.075
(8)|f1/f2| 0.122 0.107 0.114 0.049
(9)|nd(L2f)-nd(L2b)| 0.05741 0.05741 0.05741 0.00769
実施例17 実施例18 実施例19 実施例20
(1)D1/f 3.652 4.161 4.088 1.864
(2)D2/f 2.245 2.418 2.678 1.366
(3)L/f 24.792 26.589 27.922 11.83
(4)D1/D2 1.626 1.721 1.527 1.365
(5)|fF/f| 3.419 3.424 3.206 2.225
(6)fR/f 4.327 4.491 4.737 2.293
(7)|f1/f| 1.902 2.11 2.139 2.134
(8)|f1/f2| 0.081 0.062 0.038 0.038
(9)|nd(L2f)-nd(L2b)| 0.04099 0.04099 0.04099 -
実施例21 実施例22 実施例23 実施例24
(1)D1/f 2.135 2.497 2.489 4.284
(2)D2/f 1.337 1.544 1.529 3.011
(3)L/f 11.672 12.511 12.436 23.513
(4)D1/D2 1.597 1.617 1.628 1.423
(5)|fF/f| 2.405 2.538 2.607 1.847
(6)fR/f 2.356 2.458 2.434 4.107
(7)|f1/f| 2.249 2.236 2.355 4.025
(8)|f1/f2| 0.025 0.012 0.009 0.786
(9)|nd(L2f)-nd(L2b)| - - - -
実施例25 実施例26 実施例27 実施例28
(1)D1/f 2.726 3.763 3.779 3.925
(2)D2/f 1.791 1.953 2.495 2.585
(3)L/f 14.838 20.57 22.028 22.829
(4)D1/D2 1.522 1.927 1.514 1.518
(5)|fF/f| 2.38 2.707 2.172 2.465
(6)fR/f 2.781 3.526 4.01 4.099
(7)|f1/f| 2.734 3.231 2.772 2.194
(8)|f1/f2| 0.145 0.231 0.266 0.043
(9)|nd(L2f)-nd(L2b)| - 0.05741 0.05741 0.05741
実施例29 実施例30 実施例31 実施例32
(1)D1/f 3.945 3.321 3.843 3.198
(2)D2/f 2.475 2.454 2.079 2.38
(3)L/f 23.619 23.624 20.395 22.606
(4)D1/D2 1.594 1.353 1.848 1.343
(5)|fF/f| 2.721 2.577 2.702 2.627
(6)fR/f 4.079 3.998 3.528 3.722
(7)|f1/f| 2.216 2.164 3.306 2.208
(8)|f1/f2| 0.004 0.015 0.256 0.003
(9)|nd(L2f)-nd(L2b)| 0.05741 0.05741 0.05741 0.00638
実施例33
(1)D1/f 2.501
(2)D2/f 1.37
(3)L/f 12.311
(4)D1/D2 1.825
(5)|fF/f| 2.369
(6)fR/f 2.327
(7)|f1/f| 1.657
(8)|f1/f2| 0.159
(9)|nd(L2f)-nd(L2b)| -
なお、これらの実施例から以下の構成の発明が導かれる。
(付記項1)
物体側から順に、負の屈折力を有する前側レンズ群と、光路変換素子と、明るさ絞りと、正の屈折力を有する後側レンズ群と、からなり、
前側レンズ群は、第1レンズと、第2レンズと、からなり、
後側レンズ群は、第3レンズと、正の屈折力を有する接合レンズと、からなり、
第1レンズは、像面側に凹面を向けた負レンズからなり、
第2レンズは、像面側に凸面を向けた単レンズ、もしくは接合レンズからなり、
第3レンズは、正レンズからなり、
接合レンズは、両凸レンズからなる正レンズと、メニスカス形状の負レンズと、からなり、
以下の条件式(1)乃至(3)を満足することを特徴とする。
1.6<D1/f<4.7 (1)
1.0<D2/f<3.3 (2)
9.0<L/f<31.0 (3)
ただし、
D1は、前側レンズ群の最も像面側に位置するレンズの像側面から明るさ絞りまでの空気換算長、
D2は、後側レンズ群の最終レンズの像側面から像面までの空気換算長、
Lは、斜視対物光学系の全長、
fは、斜視対物光学系全系の焦点距離、
である。
以下の条件式(4)を満足することを特徴とする付記項1に記載の斜視対物光学系。
1.0<D1/D2<2.5 (4)
ただし、
D1は、前側レンズ群の最も像面側に位置するレンズの像側面から明るさ絞りまでの空気換算長、
D2は、後側レンズ群の最終レンズの像側面から像面までの空気換算長、
である。
以下の条件式(5)、(6)を満足することを特徴とする付記項2に記載の斜視対物光学系。
1.6<|fF/f|<4.5 (5)
1.9<fR/f<5.3 (6)
ただし、
fFは、前側レンズ群の焦点距離、
fRは、後側レンズ群の焦点距離、
fは、斜視対物光学系全系の焦点距離、
である。
以下の条件式(7)、(8)を満足することを特徴とする付記項2に記載の斜視対物光学系。
1.2<|f1/f|<4.5 (7)
0.001<|f1/f2|<0.9 (8)
ただし、
f1は、第1レンズの焦点距離、
f2は、第2レンズの焦点距離、
fは、斜視対物光学系全系の焦点距離、
である。
第2レンズは正の屈折力を有し、以下の条件式(7’)を満足することを特徴とする付記項4に記載の斜視対物光学系。
1.2<|f1/f|<2.4 (7’)
ただし、
f1は、第1レンズの焦点距離、
fは、斜視対物光学系全系の焦点距離、
である。
第2レンズは負の屈折力を有し、以下の条件式(7”)を満足することを特徴とする付記項4に記載の斜視対物光学系。
1.9<|f1/f|<4.5 (7”)
ただし、
f1は、第1レンズの焦点距離、
fは、斜視対物光学系全系の焦点距離、
である。
第2レンズは正の屈折力を有し、下記条件式(8’)を満足することを特徴とする付記項4に記載の斜視対物光学系。
0.02<|f1/f2|<0.22 (8’)
ただし、
f1は、第1レンズの焦点距離、
f2は、第2レンズの焦点距離、
である。
第2レンズは接合レンズであり、以下の条件式(9)を満足することを特徴とする付記項1に記載の斜視対物光学系。
|nd(L2f)-nd(L2b)|≦0.1 (9)
ただし、
nd(L2f)は、第2レンズの接合レンズにおける物体側レンズの屈折率、
nd(L2b)は、第2レンズの接合レンズにおける像面側レンズの屈折率、
である。
付記項1乃至8のいずれか一項に記載の斜視対物光学系を備えることを特徴とする斜視用内視鏡。
GR 後側レンズ群
L1、L2、L3、L4、L5、L6 レンズ
CL 接合レンズ
S 明るさ絞り(開口絞り)
P プリズム(光路変換素子)
F1 フィルタ
CG カバーガラス
GL ガラスリッド
I 像面
1、5 斜視対物光学系
2、6 前側レンズ群
3、7 プリズム
4、8 後側レンズ群
20 内視鏡装置
21 斜視用内視鏡
22 ビデオプロセッサ
23 モニタ
24 斜視対物光学系
25 被写体
26 被写体の画像
Claims (9)
- 物体側から順に、負の屈折力を有する前側レンズ群と、光路変換素子と、明るさ絞りと、正の屈折力を有する後側レンズ群と、からなり、
前記前側レンズ群は、第1レンズと、第2レンズと、からなり、
前記後側レンズ群は、第3レンズと、正の屈折力を有する接合レンズと、からなり、
前記第1レンズは、像面側に凹面を向けた負レンズからなり、
前記第2レンズは、像面側に凸面を向けた単レンズ、もしくは接合レンズからなり、
前記第3レンズは、正レンズからなり、
前記接合レンズは、両凸レンズからなる正レンズと、メニスカス形状の負レンズと、からなり、
以下の条件式(1)乃至(3)を満足することを特徴とする斜視対物光学系。
1.6<D1/f<4.7 (1)
1.0<D2/f<3.3 (2)
9.0<L/f<31.0 (3)
ただし、
D1は、前記前側レンズ群の最も像面側に位置するレンズの像側面から前記明るさ絞りまでの空気換算長、
D2は、前記後側レンズ群の最終レンズの像側面から像面までの空気換算長、
Lは、前記斜視対物光学系の全長、
fは、前記斜視対物光学系全系の焦点距離、
である。 - 以下の条件式(4)を満足することを特徴とする請求項1に記載の斜視対物光学系。
1.0<D1/D2<2.5 (4)
ただし、
D1は、前記前側レンズ群の最も像面側に位置するレンズの像側面から明るさ絞りまでの空気換算長、
D2は、前記後側レンズ群の最終レンズの像側面から像面までの空気換算長、
である。 - 以下の条件式(5)、(6)を満足することを特徴とする請求項2に記載の斜視対物光学系。
1.6<|fF/f|<4.5 (5)
1.9<fR/f<5.3 (6)
ただし、
fFは、前記前側レンズ群の焦点距離、
fRは、前記後側レンズ群の焦点距離、
fは、前記斜視対物光学系全系の焦点距離、
である。 - 以下の条件式(7)、(8)を満足することを特徴とする請求項2に記載の斜視対物光学系。
1.2<|f1/f|<4.5 (7)
0.001<|f1/f2|<0.9 (8)
ただし、
f1は、前記第1レンズの焦点距離、
f2は、前記第2レンズの焦点距離、
fは、前記斜視対物光学系全系の焦点距離、
である。 - 前記第2レンズは正の屈折力を有し、以下の条件式(7’)を満足することを特徴とする請求項4に記載の斜視対物光学系。
1.2<|f1/f|<2.4 (7’)
ただし、
f1は、前記第1レンズの焦点距離、
fは、前記斜視対物光学系全系の焦点距離、
である。 - 前記第2レンズは負の屈折力を有し、以下の条件式(7”)を満足することを特徴とする請求項4に記載の斜視対物光学系。
1.9<|f1/f|<4.5 (7”)
ただし、
f1は、前記第1レンズの焦点距離、
fは、前記斜視対物光学系全系の焦点距離、
である。 - 前記第2レンズは正の屈折力を有し、下記条件式(8’)を満足することを特徴とする請求項4に記載の斜視対物光学系。
0.02<|f1/f2|<0.22 (8’)
ただし、
f1は、前記第1レンズの焦点距離、
f2は、前記第2レンズの焦点距離、
である。 - 前記第2レンズは接合レンズであり、以下の条件式(9)を満足することを特徴とする請求項1に記載の斜視対物光学系。
|nd(L2f)-nd(L2b)|≦0.1 (9)
ただし、
nd(L2f)は、前記第2レンズの接合レンズにおける物体側レンズの屈折率、
nd(L2b)は、前記第2レンズの接合レンズにおける像面側レンズの屈折率、
である。 - 請求項1に記載の斜視対物光学系を備えることを特徴とする斜視用内視鏡。
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WO2021166023A1 (ja) * | 2020-02-17 | 2021-08-26 | オリンパス株式会社 | 対物光学系、撮像装置及び内視鏡 |
CN114839759A (zh) * | 2022-04-08 | 2022-08-02 | 长春理工大学 | 一种带有视向棱镜的显微内窥镜物镜*** |
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DE102017113274A1 (de) * | 2017-06-16 | 2018-12-20 | avateramedical GmBH | Kameraobjektiv für ein Endoskop und Endoskop |
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CN114839759A (zh) * | 2022-04-08 | 2022-08-02 | 长春理工大学 | 一种带有视向棱镜的显微内窥镜物镜*** |
CN114839759B (zh) * | 2022-04-08 | 2023-11-07 | 长春理工大学 | 一种带有视向棱镜的显微内窥镜物镜*** |
Also Published As
Publication number | Publication date |
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US9933610B2 (en) | 2018-04-03 |
CN107430260A (zh) | 2017-12-01 |
JP6173648B1 (ja) | 2017-08-02 |
CN107430260B (zh) | 2020-03-03 |
JPWO2017104268A1 (ja) | 2017-12-14 |
US20180017777A1 (en) | 2018-01-18 |
EP3392693A1 (en) | 2018-10-24 |
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