WO2013099255A1 - 撮像レンズおよび撮像レンズを備えた撮像装置 - Google Patents
撮像レンズおよび撮像レンズを備えた撮像装置 Download PDFInfo
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- WO2013099255A1 WO2013099255A1 PCT/JP2012/008355 JP2012008355W WO2013099255A1 WO 2013099255 A1 WO2013099255 A1 WO 2013099255A1 JP 2012008355 W JP2012008355 W JP 2012008355W WO 2013099255 A1 WO2013099255 A1 WO 2013099255A1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/60—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having five components only
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- the present invention relates to an imaging lens that forms an optical image of a subject on an imaging element such as a CCD (Charge-Coupled Device) or a CMOS (Complementary-Metal-Oxide-Semiconductor), and a digital still camera that performs photography by mounting the imaging lens.
- the present invention relates to an imaging device such as a camera-equipped mobile phone, an information portable terminal (PDA: Personal Digital Assistant), a smartphone, a tablet terminal, and a portable game machine.
- PDA Personal Digital Assistant
- the five-lens configuration described in Patent Documents 1 to 6 is required to further correct axial chromatic aberration more satisfactorily.
- the imaging lens described in Patent Document 3 is required to further reduce the overall length.
- the imaging lens described in Patent Document 4 is required to correct field curvature more favorably.
- the lens described in Patent Document 5 is required to further reduce the overall length and correct distortion more favorably.
- the present invention has been made in view of such a problem, and the object thereof is to reduce the overall length, in particular, to correct axial chromatic aberration and chromatic aberration in the periphery of the imaging region well, and from the central angle of view.
- An object of the present invention is to provide an imaging lens capable of realizing a high imaging performance up to a peripheral angle of view, and an imaging device capable of obtaining a high-resolution captured image by mounting the imaging lens.
- the imaging lens of the present invention includes, in order from the object side, an aperture stop, a first lens having a positive refractive power on the object side surface, a second lens having a negative refractive power, and a second lens having a negative refractive power.
- the imaging lens of the present invention since the configuration of each lens element is optimized in the lens configuration of five as a whole, a lens system having high resolution performance can be realized while shortening the overall length.
- the focal length of the first lens and the focal length of the third lens satisfy the formula (1), the power of the first and third lenses can be balanced, so that the total length is shortened.
- Various aberrations such as spherical aberration and astigmatism can be corrected satisfactorily.
- the optical performance can be further improved by satisfying the following preferable configuration.
- the imaging lens according to the first aspect of the present invention preferably satisfies any of the following conditional expressions (2) to (10).
- any one of conditional expressions (2) to (10) may be satisfied, or any combination may be satisfied.
- conditional expressions (5) and (6) it is preferable that both conditional expressions are satisfied simultaneously.
- a back-focused value is used as an air-converted value.
- a member having no refractive power such as a filter or a cover glass
- the thickness of this member is calculated in terms of air.
- the third lens has a convex surface facing the object side in the vicinity of the optical axis.
- the fifth lens has a meniscus shape with a convex surface facing the object side in the vicinity of the optical axis.
- substantially consists of five lenses means that the imaging lens of the present invention has substantially no power other than the five lenses, a diaphragm It also includes that having optical elements other than a lens such as a cover glass, a lens flange, a lens barrel, an imaging device, a mechanism portion such as a camera shake correction mechanism, and the like.
- An imaging apparatus includes the imaging lens of the present invention.
- a high-resolution imaging signal can be obtained based on the high-resolution optical image obtained by the imaging lens of the present invention.
- the configuration of each lens element is optimized, and in particular, the second lens is configured so that the dispersion of the second lens is appropriate. Since the ratio of the focal length of the lens and the ratio of the focal length of the fourth lens and the fifth lens are set appropriately, the axial chromatic aberration is particularly well corrected while shortening the overall length, and from the central angle of view to the periphery A lens system having high imaging performance up to the angle of view can be realized.
- an imaging signal corresponding to the optical image formed by the imaging lens having the high imaging performance of the present invention is output, a high-resolution captured image is obtained. be able to.
- FIG. 1 is a lens cross-sectional view illustrating a first configuration example of an imaging lens according to an embodiment of the present invention and corresponding to Example 1.
- FIG. FIG. 2 is a lens cross-sectional view illustrating a second configuration example of an imaging lens according to an embodiment of the present invention and corresponding to Example 2; 3 is a lens cross-sectional view illustrating a third configuration example of an imaging lens according to an embodiment of the present invention and corresponding to Example 3.
- FIG. 4 is a lens cross-sectional view illustrating a fourth configuration example of an imaging lens according to an embodiment of the present invention and corresponding to Example 4;
- FIG. 5 is a lens cross-sectional view illustrating a fifth configuration example of an imaging lens according to an embodiment of the present invention and corresponding to Example 5.
- FIG. 1 is a lens cross-sectional view illustrating a first configuration example of an imaging lens according to an embodiment of the present invention and corresponding to Example 1.
- FIG. FIG. 2 is a lens cross-sectional view illustrating a second configuration
- FIG. 6 is a lens cross-sectional view illustrating a sixth configuration example of an imaging lens according to an embodiment of the present invention and corresponding to Example 6.
- FIG. 7 is a lens cross-sectional view illustrating a seventh configuration example of an imaging lens according to an embodiment of the present invention and corresponding to Example 7.
- FIG. 8 shows an eighth configuration example of the imaging lens according to an embodiment of the present invention, and is a lens cross-sectional view corresponding to Example 8.
- FIG. 9 is a lens cross-sectional view illustrating a ninth configuration example of an imaging lens according to an embodiment of the present invention and corresponding to Example 9.
- FIG. 10 is a lens cross-sectional view illustrating a tenth configuration example of an imaging lens according to an embodiment of the present invention and corresponding to Example 10.
- FIG. 11 shows an eleventh configuration example of the imaging lens according to the embodiment of the invention, and is a lens cross-sectional view corresponding to Example 11.
- FIG. 12 is a lens cross-sectional view illustrating a twelfth configuration example of an imaging lens according to an embodiment of the present invention and corresponding to Example 12.
- FIG. 14 is a lens cross-sectional view illustrating a thirteenth configuration example of an imaging lens according to an embodiment of the present invention and corresponding to Example 13.
- FIG. FIG. 4 is an aberration diagram showing various aberrations of the imaging lens according to Example 1 of the present invention, in which (A) is spherical aberration, (B) is astigmatism (field curvature), (C) is distortion, and (D). Indicates lateral chromatic aberration.
- FIG. 1 It is an aberration diagram which shows the various aberrations of the imaging lens which concerns on Example 2 of this invention, (A) is spherical aberration, (B) is astigmatism (field curvature), (C) is distortion aberration, (D). Indicates lateral chromatic aberration. It is an aberration diagram which shows the various aberrations of the imaging lens which concerns on Example 3 of this invention, (A) is spherical aberration, (B) is astigmatism (field curvature), (C) is a distortion aberration, (D). Indicates lateral chromatic aberration.
- FIG. 4 It is an aberration diagram which shows the various aberrations of the imaging lens which concerns on Example 4 of this invention, (A) is spherical aberration, (B) is astigmatism (field curvature), (C) is distortion aberration, (D). Indicates lateral chromatic aberration. It is an aberration diagram which shows the various aberrations of the imaging lens which concerns on Example 5 of this invention, (A) is spherical aberration, (B) is astigmatism (field curvature), (C) is distortion aberration, (D). Indicates lateral chromatic aberration.
- FIG. 6 It is an aberration diagram which shows the various aberrations of the imaging lens which concerns on Example 6 of this invention, (A) is spherical aberration, (B) is astigmatism (field curvature), (C) is distortion aberration, (D). Indicates lateral chromatic aberration. It is an aberration diagram which shows the various aberrations of the imaging lens which concerns on Example 7 of this invention, (A) is spherical aberration, (B) is astigmatism (field curvature), (C) is distortion aberration, (D). Indicates lateral chromatic aberration.
- FIG. 8 It is an aberration diagram which shows the various aberrations of the imaging lens which concerns on Example 8 of this invention, (A) is spherical aberration, (B) is astigmatism (field curvature), (C) is distortion aberration, (D). Indicates lateral chromatic aberration. It is an aberration diagram showing various aberrations of the imaging lens according to Example 9 of the present invention, (A) is spherical aberration, (B) is astigmatism (field curvature), (C) is distortion, (D) Indicates lateral chromatic aberration.
- FIG. 10 It is an aberration diagram which shows the various aberrations of the imaging lens which concerns on Example 10 of this invention, (A) is spherical aberration, (B) is astigmatism (field curvature), (C) is distortion aberration, (D). Indicates lateral chromatic aberration. It is an aberration diagram which shows the various aberrations of the imaging lens which concerns on Example 11 of this invention, (A) is spherical aberration, (B) is astigmatism (field curvature), (C) is distortion aberration, (D). Indicates lateral chromatic aberration.
- FIG. 12 It is an aberration diagram which shows the various aberrations of the imaging lens which concerns on Example 12 of this invention, (A) is spherical aberration, (B) is astigmatism (field curvature), (C) is a distortion aberration, (D). Indicates lateral chromatic aberration. It is an aberration diagram showing various aberrations of the imaging lens according to Example 13 of the present invention, (A) is spherical aberration, (B) is astigmatism (field curvature), (C) is distortion, (D) Indicates lateral chromatic aberration.
- FIG. 14 is a lens cross-sectional view illustrating a fourteenth configuration example of an imaging lens according to an embodiment of the present invention and corresponding to Example 14.
- FIG. 15 shows a fifteenth configuration example of the imaging lens according to the embodiment of the invention, and is a lens cross-sectional view corresponding to Example 15.
- FIG. It is an aberration diagram which shows the various aberrations of the imaging lens which concerns on Example 14 of this invention, (A) is spherical aberration, (B) is astigmatism (field curvature), (C) is distortion aberration, (D). Indicates lateral chromatic aberration.
- FIG. 15 It is an aberration diagram which shows the various aberrations of the imaging lens which concerns on Example 15 of this invention, (A) is spherical aberration, (B) is astigmatism (field curvature), (C) is distortion aberration, (D). Indicates lateral chromatic aberration.
- FIG. 1 shows a first configuration example of the imaging lens according to the first embodiment of the present invention.
- This configuration example corresponds to the lens configuration of a first numerical example (Tables 1 and 14) described later.
- cross-sectional configurations of the imaging lenses according to the second to thirteenth embodiments corresponding to the lens configurations of second to thirteenth numerical examples (Tables 2 to 13 and Tables 15 to 26) described later are shown. 2 to 13 respectively.
- FIGS. 28 to 29 show cross-sectional configurations of the imaging lenses according to the fourteenth to fifteenth embodiments corresponding to the lens configurations of the fourteenth to fifteenth numerical examples (Tables 28 to 31) described later. Show. In FIG. 1 to FIG.
- the symbol Ri denotes the curvature of the i-th surface, where the surface of the lens element closest to the object side is the first, and is increased sequentially toward the image side (imaging side). Indicates the radius.
- the symbol Di indicates the surface interval on the optical axis Z1 between the i-th surface and the i + 1-th surface. Since the basic configuration is the same for each configuration example, the configuration example of the imaging lens shown in FIG. 1 will be basically described below, and the configuration examples of FIGS. explain.
- the imaging lens L includes various imaging devices using an image sensor such as a CCD or a CMOS, particularly a relatively small portable terminal device such as a digital still. It is suitable for use in cameras, mobile phones with cameras, PDAs, smartphones or tablet terminals.
- the imaging lens L includes an aperture stop St, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens in order from the object side along the optical axis Z1. L5.
- FIG. 27 shows an overview of a mobile phone terminal that is the imaging apparatus 1 according to the embodiment of the present invention.
- An imaging device 1 according to an embodiment of the present invention includes an imaging lens L according to the present embodiment and an imaging element 100 such as a CCD that outputs an imaging signal corresponding to an optical image formed by the imaging lens L (see FIG. 1).
- the image sensor 100 is disposed on the imaging surface (imaging surface) of the imaging lens L.
- FIG. 33 shows an overview of a smartphone that is the imaging apparatus 501 according to the embodiment of the present invention.
- An image pickup apparatus 501 according to the embodiment of the present invention includes an image pickup lens L according to this embodiment and an image pickup device 100 such as a CCD that outputs an image pickup signal corresponding to an optical image formed by the image pickup lens L (see FIG. 1)).
- the image sensor 100 is disposed on the imaging surface (imaging surface) of the imaging lens L.
- FIG. 32 shows an example of a light shielding method that does not contribute to image formation in the imaging lens according to the embodiment of the present invention.
- FIG. 32 is a partially enlarged view showing only a portion above the optical axis Z1 in the lens cross-sectional view (see FIG. 29) of the fourteenth embodiment. Since the light flux that does not contribute to image formation that passes outside the effective diameter of the imaging lens may be harmful light on the image formation surface, in order to remove such light flux that does not contribute to image formation, A method of arranging the light shielding plate outside the effective diameter between the lenses is generally used. In the imaging lens shown in FIG.
- an aperture stop St is provided on the object side of the first lens L1 so as to be located outside the effective diameter of the first lens, and the first lens L1 to the fifth lens L5 are adjacent to each other.
- a light shielding plate B is provided between the lenses to be positioned outside the effective diameter of each lens.
- paint A for light shielding is applied to the image-side surface of the fourth lens L4 and the image-side surface of the fifth lens L5 in a region outside the effective diameter of each lens. In this way, by applying paint for light shielding to a desired area outside the effective diameter of the lens, images are formed even in areas where light shielding is difficult with only the light shielding plate due to restrictions on the shape of the light shielding plate and the arrangement space. The light rays that do not contribute to the light can be suitably shielded.
- Various optical members CG may be arranged between the fifth lens L5 and the image sensor 100 according to the configuration on the camera side where the lens is mounted.
- a flat optical member such as a cover glass for protecting the imaging surface or an infrared cut filter may be disposed.
- a flat cover glass provided with a coating having a filter effect such as an infrared cut filter or an ND filter may be used.
- the fifth lens L5 may be coated to have the same effect as the optical member CG. Thereby, the number of parts can be reduced and the total length can be shortened.
- the imaging lens L also has an aperture stop St.
- the aperture stop St is an optical aperture stop and is a so-called “front stop” disposed closest to the object side.
- the “front stop” means that the position of the aperture stop in the optical axis direction is at the same position as the intersection of the axial marginal ray and the object side surface of the first lens L1 or closer to the object side.
- the lenses of the first to fifteenth configuration examples are configuration examples corresponding to the front diaphragm.
- This imaging lens L preferably uses an aspherical surface for at least one surface of each of the first lens L1 to the fifth lens L5 for high performance.
- the first lens L1 has a positive refractive power in the vicinity of the optical axis.
- the object side surface is convex toward the object side in the vicinity of the optical axis.
- the second lens L2 has a negative refractive power in the vicinity of the optical axis.
- the third lens L3 has a positive refractive power in the vicinity of the optical axis.
- the third lens L3 preferably has a convex surface on the object side near the optical axis.
- the third lens L3 has a biconvex shape in the vicinity of the optical axis.
- the third lens L3 may have a meniscus shape with a convex surface facing the object side in the vicinity of the optical axis.
- the third lens L3 may have a meniscus shape with a convex surface facing the image side in the vicinity of the optical axis. In this case, astigmatism can be corrected satisfactorily.
- the fourth lens L4 has a negative refractive power in the vicinity of the optical axis.
- the fourth lens L4 has a concave surface on the object side on the object side in the vicinity of the optical axis.
- a decrease in the amount of peripheral light can be suppressed.
- the fifth lens L5 has a negative refractive power in the vicinity of the optical axis.
- the fifth lens L5 has a region in which the negative refractive power becomes weaker from the optical axis toward the outer side in the radial direction.
- the incident angle of the light beam passing through the optical system to the imaging surface (imaging device) increases. Can be suppressed.
- the negative refractive power decreases as it goes radially outward from the optical axis means that the surface having at least one concave portion in the vicinity of the optical axis has a radial direction from the optical axis to the lens. Any negative refractive power may be used as long as it goes outward, and for example, the positive refractive power may become stronger from the optical axis toward the outer side in the radial direction of the lens.
- the image side surface of the fifth lens L5 has a region that changes from a concave shape to a convex shape toward the image side as it goes from the optical axis to the outside in the radial direction of the lens.
- the negative refractive power of the image side surface of the fifth lens L5 becomes weaker from the optical axis toward the outer side in the radial direction of the lens.
- making the fifth lens have negative refractive power is advantageous for correcting various aberrations, particularly spherical aberration and axial chromatic aberration.
- the fifth lens has a meniscus shape with a convex surface facing the object side in the vicinity of the optical axis.
- each of the lenses L1 to L5 constituting the imaging lens L is not a cemented lens but a single lens. This is because the number of aspheric surfaces is larger than when any one of the lenses L1 to L5 is a cemented lens, so that the degree of freedom in designing each lens is increased, and the overall length can be suitably shortened.
- conditional expression (1) defines a preferable numerical range of the ratio of the focal length f3 of the third lens to the focal length f1 of the first lens when each configuration of the imaging lens L in the present invention is provided. If the upper limit of conditional expression (1) is exceeded, the positive refractive power of the first lens L1 becomes too strong for the entire lens system, and it becomes difficult to sufficiently correct spherical aberration.
- conditional expression (1) If the lower limit of conditional expression (1) is exceeded, the positive refractive power of the third lens L3 becomes too strong with respect to the first lens L1, and it becomes difficult to sufficiently correct astigmatism. Therefore, by satisfying the range of conditional expression (1), it is possible to correct various aberrations satisfactorily while shortening the entire length of the lens system. From the above viewpoint, it is more preferable to satisfy the following conditional expression (1-1), and it is even more preferable to satisfy the conditional expression (1-2). 4.2 ⁇ f3 / f1 ⁇ 20.0 (1-1) 5.0 ⁇ f3 / f1 ⁇ 20.0 (1-2)
- the ratio of the focal length f2 of the second lens to the focal length f1 of the first lens L1 preferably satisfies the following conditional expression (2). -4.0 ⁇ f2 / f1 ⁇ -1.8 (2)
- Conditional expression (2) defines a preferable numerical range of the ratio of the focal length f2 of the second lens to the focal length f1 of the first lens.
- conditional expression (2) it is possible to satisfactorily correct various aberrations such as chromatic aberration, astigmatism, and spherical aberration while realizing shortening of the entire length of the lens system. From the above viewpoint, it is more preferable to satisfy the following conditional expression (2-1), and it is even more preferable to satisfy the conditional expression (2-2). -3.5 ⁇ f2 / f1 ⁇ -1.8 (2-1) ⁇ 3.2 ⁇ f2 / f1 ⁇ 1.8 (2-2)
- conditional expression (3) defines a preferable numerical range of the ratio of the distance D6 on the optical axis between the third lens L3 and the fourth lens L3 with respect to the focal length f of the entire system. If the upper limit of conditional expression (3) is exceeded, the total lens length becomes long. When the lower limit of conditional expression (3) is not reached, the thickness of the air lens formed by the gap between the image-side surface of the third lens L3 and the object-side surface of the fourth lens L4 becomes thin, and the total lens length is shortened.
- conditional expression (4) defines a preferable numerical range of the ratio between the distance D8 on the optical axis of the fourth lens L4 and the fifth lens L5 and the distance D6 on the optical axis of the third lens L3 and the fourth lens L3.
- conditional expression (4) defines a preferable numerical range of the ratio between the distance D8 on the optical axis of the fourth lens L4 and the fifth lens L5 and the distance D6 on the optical axis of the third lens L3 and the fourth lens L3.
- conditional expression (4) various aberrations such as spherical aberration, astigmatism, and curvature of field can be favorably corrected. From the above viewpoint, it is more preferable to satisfy the following conditional expression (4-1), and it is even more preferable to satisfy the conditional expression (4-2). 2.20 ⁇ D6 / D8 ⁇ 5.60 (4-1) 2.30 ⁇ D6 / D8 ⁇ 5.40 (4-2)
- the Abbe number ⁇ d1 related to the d-line of the first lens L1 and the Abbe number ⁇ d2 related to the d-line of the second lens L2 further satisfy the following conditional expressions (5) and (6).
- Conditional expressions (5) and (6) relate to the Abbe number ⁇ d1 related to the d-line of the first lens L1 and the d-line of the second lens L2 when each configuration of the imaging lens L in the first aspect of the present invention is provided.
- a preferable numerical range of the Abbe number ⁇ d2 is defined respectively. Satisfying conditional expressions (5) and (6) simultaneously is advantageous for correcting chromatic aberration.
- conditional expressions (5-1) and (6-1) it is more preferable to further satisfy one of the following conditional expressions (5-1) and (6-1), and both the conditional expressions (5-1) and (6-1) are simultaneously satisfied. Even more preferably. ⁇ d1> 53 (5-1) ⁇ d2 ⁇ 25 (6-1)
- conditional expression (7) defines a preferable numerical range of the ratio of the distance D2 on the optical axis of the first lens L1 and the second lens L2 to the center thickness D1 of the first lens L1. If the upper limit of conditional expression (7) is exceeded, it will be difficult to sufficiently correct chromatic aberration. If the lower limit of conditional expression (7) is exceeded, it is advantageous for correcting chromatic aberration, but it becomes difficult to sufficiently correct spherical aberration.
- chromatic aberration can be favorably corrected by satisfying the range of conditional expression (7).
- conditional expression (8) defines a preferable numerical range of the radius of curvature R3 in the vicinity of the object side surface of the third lens L3 with respect to the focal length f2 of the second lens L2. If the upper limit of conditional expression (8) is exceeded, it will be difficult to sufficiently correct astigmatism. If the lower limit is not reached, it is difficult to sufficiently correct axial chromatic aberration.
- the ratio of the length TL from the L1 object side surface of the first lens to the imaging surface with respect to the focal length f of the entire lens system preferably satisfies the following conditional expression (9). 1.0 ⁇ TL / f ⁇ 1.2 (9)
- Conditional expression (9) defines a preferable numerical range of the ratio of the length TL from the object side surface of the first lens L1 to the imaging surface with respect to the focal length f of the entire lens system. Note that, for the length TL on the optical axis from the object-side surface of the first lens to the imaging surface, a back-focused value is used as an air-converted value.
- the thickness of this member is calculated in terms of air.
- the total lens length means the length TL on the optical axis from the object-side surface of the first lens to the imaging surface. If the upper limit of conditional expression (9) is exceeded, the total lens system length TL becomes too large, which is disadvantageous for shortening the total lens system length TL. If the lower limit is exceeded, it is advantageous for shortening the total length TL, but it becomes difficult to sufficiently correct various aberrations, so that it becomes difficult to obtain high resolution performance.
- conditional expression (9) various aberrations can be favorably corrected while shortening the total length TL of the lens system. From the above viewpoint, it is more preferable that the following conditional expression (9-1) is satisfied. 1.05 ⁇ TL / f ⁇ 1.15 (9-1)
- conditional expression (10) defines a preferable numerical range regarding the paraxial radius of curvature R7 of the object side surface of the fourth lens L4 and the paraxial radius of curvature R8 of the image side surface of the fourth lens L4. If the upper limit of conditional expression (10) is exceeded, it is suitable for suppressing a decrease in the peripheral light amount ratio, but it becomes difficult to sufficiently correct various aberrations, particularly astigmatism. If the lower limit is not reached, it is difficult to sufficiently suppress the decrease in the peripheral light amount ratio. Therefore, by satisfying the range of conditional expression (10), it is possible to correct various aberrations satisfactorily while suppressing a decrease in the peripheral light amount ratio.
- the configuration of each lens element is optimized in a lens configuration of five lenses as a whole, and in particular, the focal length of the third lens and the first lens. Therefore, it is possible to realize a lens system in which spherical aberration and astigmatism are particularly favorably corrected, the F-number is small, and high resolution performance is achieved while the total length is shortened.
- the imaging signal corresponding to the optical image formed by the high-performance imaging lens L according to the present embodiment is output.
- a high-resolution captured image can be obtained up to the angle of view.
- Table 1 and Table 14 below show specific lens data corresponding to the configuration of the imaging lens shown in FIG.
- Table 1 shows basic lens data
- Table 14 shows data related to aspheric surfaces.
- the surface of the lens element closest to the object side is the first (aperture stop St is the 0th) and heads toward the image side.
- the value (mm) of the curvature radius of the i-th surface from the object side is shown in correspondence with the reference symbol Ri in FIG.
- the column of the surface interval Di indicates the interval (mm) on the optical axis between the i-th surface Si and the i + 1-th surface Si + 1 from the object side.
- the column Ndj the value of the refractive index for the d-line (587.56 nm) of the j-th optical element from the object side is shown.
- the column of ⁇ dj shows the Abbe number value for the d-line of the j-th optical element from the object side.
- both surfaces of the first lens L1 to the fifth lens L5 are all aspherical.
- the basic lens data in Table 1 shows the numerical value of the radius of curvature near the optical axis (paraxial radius of curvature) as the radius of curvature of these aspheric surfaces.
- Table 14 shows aspherical data in the imaging lens of Example 1.
- E indicates that the subsequent numerical value is a “power exponent” with a base of 10
- the numerical value represented by an exponential function with the base of 10 is Indicates that the value before “E” is multiplied.
- “1.0E-02” indicates “1.0 ⁇ 10 ⁇ 2 ”.
- Z is the length (mm) of a perpendicular line drawn from a point on the aspheric surface at a height h from the optical axis to the tangential plane (plane perpendicular to the optical axis) of the apex of the aspheric surface.
- Z C ⁇ h 2 / ⁇ 1+ (1 ⁇ K ⁇ C 2 ⁇ h 2 ) 1/2 ⁇ + ⁇ Ai ⁇ h i (A)
- Z Depth of aspheric surface (mm)
- h Distance from the optical axis to the lens surface (height) (mm)
- C: Paraxial curvature 1 / R (R: paraxial radius of curvature)
- K aspheric coefficient
- Table 2 and Table 15 show specific lens data corresponding to the configuration of the imaging lens shown in FIG. 2 as Example 2 in the same manner as the imaging lens of Example 1 described above.
- specific lens data corresponding to the configuration of the imaging lens shown in FIGS. 3 to 13 are shown in Tables 3 to 13 and Tables 16 to 26 as Examples 3 to 13.
- specific lens data corresponding to the configuration of the imaging lens shown in FIGS. 28 to 29 is shown in Tables 28 to 31 as Examples 14 to 15.
- both surfaces of the first lens L1 to the fifth lens L5 are all aspherical.
- FIGS. 14A to 14D are diagrams showing spherical aberration, astigmatism (field curvature), distortion (distortion aberration), and chromatic aberration of magnification in the imaging lens of Example 1, respectively.
- Each aberration diagram showing spherical aberration, astigmatism (field curvature) and distortion (distortion aberration) shows aberrations with the d-line (wavelength 587.56 nm) as the reference wavelength.
- the spherical aberration diagram, astigmatism diagram, and lateral chromatic aberration diagram also show aberrations for the F-line (wavelength 486.1 nm) and C-line (wavelength 656.27 nm).
- the chromatic aberration diagram of magnification also shows aberrations for the F line (wavelength 486.1 nm) and the C line (wavelength 656.27 nm).
- the solid line indicates the sagittal direction (S)
- the broken line indicates the tangential direction (T).
- Fno represents an F number
- ⁇ represents a half angle of view.
- 30 (A) to (D) and FIGS. 31 (A) to (D) show only aberrations with the d-line (wavelength 587.56 nm) as the reference wavelength in the astigmatism diagrams.
- Table 27 shows values relating to the conditional expressions (1) to (10) according to the present invention, which are summarized for each of the examples 1 to 15.
- each embodiment achieves high imaging performance as well as shortening the overall length.
- the imaging lens of the present invention is not limited to the above-described embodiments and examples, and various modifications can be made.
- the values of the radius of curvature, the surface interval, the refractive index, the Abbe number, and the aspheric coefficient of each lens component are not limited to the values shown in the above numerical examples, and may take other values.
- the description is based on the premise that the fixed focus is used.
- the entire lens system can be extended, or a part of the lenses can be moved on the optical axis to enable autofocusing.
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Abstract
Description
4.2<f3/f1<25.0 (1)
ただし、
f1:第1レンズの焦点距離
f3:第3レンズの焦点距離
とする。
4.2<f3/f1<20.0 (1-1)
-4.0<f2/f1<-1.8 (2)
-3.5<f2/f1<-1.8 (2-1)
0.09<D6/f<0.20 (3)
0.09<D6/f<0.18 (3-1)
2.00<D6/D8<6.00 (4)
2.20<D6/D8<5.60 (4-1)
νd1>50 (5)
νd1>53 (5-1)
νd2<30 (6)
νd2<25 (6-1)
0.09<D2/D1<0.25 (7)
0.09<D2/D1<0.22 (7-1)
3.0<|R3/f2|<40.0 (8)
3.3<|R3/f2|<35.0 (8-1)
1.0<TL/f<1.2 (9)
1.05<TL/f<1.15 (9-1)
-1.9<(R7-R8)/(R7+R8)<0 (10)
ただし、
f1:第1レンズの焦点距離
f2:第2レンズの焦点距離
f3:第3レンズの焦点距離
D6:第3レンズと第4レンズの光軸上の間隔
f:全系の焦点距離
D8:第4レンズと第5レンズの光軸上の間隔
νd1:第1レンズのd線に関するアッベ数
νd2:第2レンズのd線に関するアッベ数
D1:第1レンズの中心厚
D2:第1レンズと第2レンズの光軸上の間隔
R3:第2レンズの物体側の面の近軸曲率半径
TL:第1レンズの物体側の面から結像面までの光軸上の長さ
R7:第4レンズの物体側の面の近軸曲率半径
R8:第4レンズの像側の面の近軸曲率半径
とする。なお、上記第1レンズの物体側の面から結像面までの光軸上の長さTLについてバックフォーカス分は空気換算した値を用いるものとする。例えば、最も像側のレンズと結像面との間にフィルタやカバーガラス等の屈折力を持たない部材が挿入されているときは、この部材の厚みを空気換算して算出するものとする。
4.2<f3/f1<25.0 (1)
条件式(1)は、本発明における撮像レンズLの各構成を備えた場合における第1レンズの焦点距離f1に対する第3レンズの焦点距離f3の比の好ましい数値範囲を規定するものである。条件式(1)の上限を上まわると、レンズ系全体に対して第1レンズL1の正の屈折力が強くなりすぎて、球面収差を十分補正することが難しくなる。条件式(1)の下限を下まわると、第1レンズL1に対して第3レンズL3の正の屈折力が強くなりすぎて、非点収差を十分補正することが難しくなる。このため、条件式(1)の範囲を満たすことで、レンズ系全体の長さを短縮化しつつ諸収差を良好に補正することができる。上記観点から、下記条件式(1-1)を満たすことがより好ましく、条件式(1-2)を満たすことがよりさらに好ましい。
4.2<f3/f1<20.0 (1-1)
5.0<f3/f1<20.0 (1-2)
-4.0<f2/f1<-1.8 (2)
条件式(2)は、第1レンズの焦点距離f1に対する第2レンズの焦点距離f2の比の好ましい数値範囲を規定する。条件式(2)の上限を上まわると、レンズ系全体における主たる負の屈折作用を有する第2レンズL2の負の屈折力が、レンズ系全体における主たる正の屈折作用を有する第1レンズL1の正の屈折力に対して強くなりすぎて、球面収差の増大を招いてしまうとともにレンズ全長の短縮化が難しくなる。条件式(4)の下限を下まわると、第2レンズL2の負の屈折力が第1レンズL1の正の屈折力に対して弱くなりすぎて、色収差の補正に不利である。さらに、条件式(4)の下限を下まわると、非点収差の補正が困難になると同時に、周辺光量の低下を抑えることが難しくなる。従って、上記条件式(2)の範囲を満たすことで、レンズ系全長の短縮化を実現しつつ色収差、非点収差、球面収差などの諸収差を良好に補正することができる。上記観点から、下記条件式(2-1)を満たすことがより好ましく、条件式(2-2)を満たすことがよりさらに好ましい。
-3.5<f2/f1<-1.8 (2-1)
-3.2<f2/f1<-1.8 (2-2)
0.09<D6/f<0.20 (3)
条件式(3)は、全系の焦点距離fに対する第3レンズL3と第4レンズL3の光軸上の間隔D6の比の好ましい数値範囲を規定する。条件式(3)の上限を上まわるとレンズ全長が長くなってしまう。条件式(3)の下限を下まわると、第3レンズL3の像側の面と第4レンズL4の物体側の面の間隙により形成される空気レンズの厚さが薄くなり、レンズ全長の短縮化には有利であるが、諸収差、特に像面湾曲の補正が不十分となり、高解像性能が得られない。以上により、条件式(3)の範囲を満たすことで、レンズ系全長の短縮化を図りつつ像面湾曲などの諸収差を良好に補正することができる。上記観点から、下記条件式(3-1)を満たすことがより好ましく、条件式(3-2)を満たすことがよりさらに好ましい。
0.09<D6/f<0.18 (3-1)
0.09<D6/f<0.16 (3-2)
2.00<D6/D8<6.00 (4)
条件式(4)は、第4レンズL4と第5レンズL5の光軸上の間隔D8と第3レンズL3と第4レンズL3の光軸上の間隔D6の比の好ましい数値範囲を規定する。条件式(4)の上限を上まわると、第4レンズL4の像側の面と第5レンズL5の物体側の面の微小な間隙により形成される空気レンズの厚さが、第3レンズL3の像側の面と第4レンズL4の物体側の面の間隙により形成される空気レンズの厚さに対して薄くなりすぎてしまい、球面収差を十分に補正することが難しくなる。条件式(4)の下限を下まわると、非点収差と像面湾曲を十分に補正することが難しくなる。条件式(4)を満たすことで、球面収差、非点収差、像面湾曲などの諸収差を良好に補正することができる。上記観点から、下記条件式(4-1)を満たすことがより好ましく、条件式(4-2)を満たすことがよりさらに好ましい。
2.20<D6/D8<5.60 (4-1)
2.30<D6/D8<5.40 (4-2)
νd1>50 (5)
νd2<30 (6)
条件式(5)および(6)は、本発明の第1の態様における撮像レンズLの各構成を備えた場合における第1レンズL1のd線に関するアッベ数νd1および第2レンズL2のd線に関するアッベ数νd2の好ましい数値範囲をそれぞれ規定する。条件式(5)、(6)を同時に満足することで、色収差の補正に有利になる。このために、下記条件式(5-1)および条件式(6-1)のいずれかをさらに満たすことがさらに好ましく、条件式(5-1)および条件式(6-1)の両方を同時に満たすことがよりさらに好ましい。
νd1>53 (5-1)
νd2<25 (6-1)
0.09<D2/D1<0.25 (7)
条件式(7)は、第1レンズL1の中心厚D1に対する第1レンズL1と第2レンズL2の光軸上の間隔D2の比の好ましい数値範囲を規定する。条件式(7)の上限を上まわると、十分に色収差を補正することが難しくなる。条件式(7)の下限を下まわると、色収差の補正に有利であるが、球面収差を十分に補正することが難しくなる。このため、条件式(7)の範囲を満たすことで、色収差を良好に補正することができる。上記の観点により、下記条件式(7-1)を満たすことがより好ましく、条件式(7-2)を満たすことがよりさらに好ましい。
0.09<D2/D1<0.22 (7-1)
0.09<D2/D1<0.20 (7-2)
3.0<|R3/f2|<40.0 (8)
条件式(8)は、第2レンズL2焦点距離f2に対する第3レンズL3の物体側の面の近傍曲率半径R3の好ましい数値範囲を規定する。条件式(8)の上限を上まわると、非点収差を十分に補正することが難しくなる。下限を下まわると、軸上色収差を十分に補正に補正することが難しくなる。条件式(8)の範囲を満たすことで、非点収差及び軸上色収差を良好に補正することができる。上記の観点により、下記条件式(8-1)を満たすことがより好ましい。
3.3<|R3/f2|<35.0 (8-1)
1.0<TL/f<1.2 (9)
条件式(9)は、レンズ系全体の焦点距離fに対する第1レンズL1の物体側の面から結像面までの長さTLの比の好ましい数値範囲を規定する。なお、上記第1レンズの物体側の面から結像面までの光軸上の長さTLについてバックフォーカス分は空気換算した値を用いるものとする。例えば、最も像側のレンズと結像面との間にフィルタやカバーガラス等の屈折力を持たない部材が挿入されているときは、この部材の厚みを空気換算して算出するものとする。また、本明細書中で、レンズ全長とは、第1レンズの物体側の面から結像面までの光軸上の長さTLを意味する。条件式(9)の上限を上まわると、レンズ系全長TLが大きくなりすぎてしまい、レンズ系全長TLの短縮化に不利となる。下限を下まわると、全長TLの短縮化のためには有利であるが、十分に諸収差の補正を行うことが難しくなるため、高解像性能を得るのが困難になる。このため、条件式(9)を満たすことで、レンズ系全長TLを短縮化しつつ、諸収差を良好に補正することができる。上記の観点により、下記条件式(9-1)を満たすことがより好ましい。
1.05<TL/f<1.15 (9-1)
-1.9<(R7-R8)/(R7+R8)<0 (10)
条件式(10)は、第4レンズL4の物体側の面の近軸曲率半径R7と第4レンズL4の像側の面の近軸曲率半径R8に関する好ましい数値範囲を規定する。条件式(10)の上限を上まわると、周辺光量比の低下を抑制するためには好適であるが、諸収差特に非点収差を十分に補正することが難しくなる。下限を下まわると、周辺光量比の低下を十分に抑制することが難しくなる。このため、条件式(10)の範囲を満たすことで、周辺光量比の低下を抑えつつ諸収差を良好に補正することができる。
ただし、
Z:非球面の深さ(mm)
h:光軸からレンズ面までの距離(高さ)(mm)
C:近軸曲率=1/R
(R:近軸曲率半径)
Ai:第i次(iは3以上の整数)の非球面係数
K:非球面係数
Claims (20)
- 物体側から順に、
開口絞りと、
物体側の面が物体側に凸形状であり、正の屈折力を有する第1レンズと、
負の屈折力を有する第2レンズと、
正の屈折力を有する第3レンズと、
物体側の面が物体側に凹形状であり、負の屈折力を有する第4レンズと、
負の屈折力を有し、光軸から半径方向外側に向かうに従って負の屈折力が弱くなる領域を有する第5レンズと、
から構成される実質的に5個のレンズからなり、
下記条件式を満足するように構成されていることを特徴とする撮像レンズ。
4.2<f3/f1<25.0 (1)
ただし、
f1:前記第1レンズの焦点距離
f3:前記第3レンズの焦点距離
とする。 - さらに以下の条件式を満足することを特徴とする請求項1に記載の撮像レンズ。
-4.0<f2/f1<-1.8 (2)
ただし、
f2:前記第2レンズの焦点距離
とする。 - 光軸近傍において前記第5レンズが物体側に凸面を向けたメニスカス形状であることを特徴とする請求項1または2に記載の撮像レンズ。
- さらに以下の条件式を満足することを特徴とする請求項1ないし3のいずれか1項に記載の撮像レンズ。
0.09<D6/f<0.20 (3)
ただし
D6:前記第3レンズと前記第4レンズの光軸上の間隔
f:全系の焦点距離
とする。 - さらに以下の条件式を満足することを特徴とする請求項1ないし4のいずれか1項に記載の撮像レンズ。
2.00<D6/D8<6.00 (4)
ただし
D6:前記第3レンズと前記第4レンズの光軸上の間隔
D8:前記第4レンズと前記第5レンズの光軸上の間隔
とする。 - 光軸近傍において前記第3レンズが物体側に凸面を向けていることを特徴とする請求項1ないし5のいずれか1項に記載の撮像レンズ。
- さらに以下の条件式を満足することを特徴とする請求項1ないし6のいずれか1項に記載の撮像レンズ。
νd1>50 (5)
νd2<30 (6)
ただし、
νd1:前記第1レンズのd線に関するアッベ数
νd2:前記第2レンズのd線に関するアッベ数
とする。 - さらに以下の条件式を満足することを特徴とする請求項1ないし7のいずれか1項に記載の撮像レンズ。
0.09<D2/D1<0.25 (7)
ただし、
D1:前記第1レンズの中心厚
D2:前記第1レンズと第2レンズの光軸上の間隔
とする。 - さらに以下の条件式を満足することを特徴とする請求項1ないし8のいずれか1項に記載の撮像レンズ。
3.0<|R3/f2|<40.0 (8)
ただし、
R3:前記第2レンズの物体側の面の近軸曲率半径
f2:前記第2レンズの焦点距離
とする。 - さらに以下の条件式を満足することを特徴とする請求項1ないし9のいずれか1項に記載の撮像レンズ。
1.0<TL/f<1.2 (9)
ただし、
TL:前記第1レンズの物体側の面から結像面までの光軸上の長さ
f:全系の焦点距離
とする。 - さらに以下の条件式を満足することを特徴とする請求項1ないし10のいずれか1項に記載の撮像レンズ。
-1.9<(R7-R8)/(R7+R8)<0 (10)
ただし、
R7:前記第4レンズの物体側の面の近軸曲率半径
R8:前記第4レンズの像側の面の近軸曲率半径
とする。 - さらに以下の条件式を満足することを特徴とする請求項1ないし11のいずれか1項に記載の撮像レンズ。
4.2<f3/f1<20.0 (1-1) - さらに以下の条件式を満足することを特徴とする請求項1ないし12のいずれか1項に記載の撮像レンズ。
-3.5<f2/f1<-1.8 (2-1)
ただし、
f2:前記第2レンズの焦点距離
とする。 - さらに以下の条件式を満足することを特徴とする請求項1ないし13のいずれか1項に記載の撮像レンズ。
0.09<D6/f<0.18 (3-1)
ただし
D6:前記第3レンズと前記第4レンズの光軸上の間隔
f:全系の焦点距離
とする。 - さらに以下の条件式を満足することを特徴とする請求項1ないし14のいずれか1項に記載の撮像レンズ。
2.20<D6/D8<5.60 (4-1)
ただし
D6:前記第3レンズと前記第4レンズの光軸上の間隔
D8:前記第4レンズと前記第5レンズの光軸上の間隔
とする。 - さらに以下の条件式を満足することを特徴とする請求項1ないし15のいずれか1項に記載の撮像レンズ。
νd1>53 (5-1)
νd2<25 (6-1)
ただし、
νd1:前記第1レンズのd線に関するアッベ数
νd2:前記第2レンズのd線に関するアッベ数
とする。 - さらに以下の条件式を満足することを特徴とする請求項1ないし16のいずれか1項に記載の撮像レンズ。
0.09<D2/D1<0.22 (7-1)
ただし、
D1:前記第1レンズの中心厚
D2:前記第1レンズと第2レンズの光軸上の間隔
とする。 - さらに以下の条件式を満足することを特徴とする請求項1ないし17のいずれか1項に記載の撮像レンズ。
3.3<|R3/f2|<35.0 (8-1)
ただし、
R3:前記第2レンズの物体側の面の近軸曲率半径
f2:前記第2レンズの焦点距離
とする。 - さらに以下の条件式を満足することを特徴とする請求項1ないし18のいずれか1項に
記載の撮像レンズ。
1.05<TL/f<1.15 (9-1)
ただし、
TL:前記第1レンズの物体側の面から結像面までの光軸上の長さ
f:全系の焦点距離
とする。 - 請求項1に記載された撮像レンズを備えたことを特徴とする撮像装置。
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JP2017521686A (ja) * | 2015-06-09 | 2017-08-03 | 浙江舜宇光学有限公司 | 撮像レンズ |
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JP5800438B2 (ja) * | 2011-12-28 | 2015-10-28 | 富士フイルム株式会社 | 撮像レンズおよび撮像レンズを備えた撮像装置 |
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Also Published As
Publication number | Publication date |
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US20140313599A1 (en) | 2014-10-23 |
US8810924B2 (en) | 2014-08-19 |
JP5800438B2 (ja) | 2015-10-28 |
JPWO2013099255A1 (ja) | 2015-04-30 |
US9335512B2 (en) | 2016-05-10 |
US20140055872A1 (en) | 2014-02-27 |
CN203643673U (zh) | 2014-06-11 |
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