CN110531495B - Single lens reflex - Google Patents

Single lens reflex Download PDF

Info

Publication number
CN110531495B
CN110531495B CN201910786154.0A CN201910786154A CN110531495B CN 110531495 B CN110531495 B CN 110531495B CN 201910786154 A CN201910786154 A CN 201910786154A CN 110531495 B CN110531495 B CN 110531495B
Authority
CN
China
Prior art keywords
lens
positive lens
positive
focal length
negative
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201910786154.0A
Other languages
Chinese (zh)
Other versions
CN110531495A (en
Inventor
张新彬
陈怀熹
李广伟
冯新凯
古克义
梁万国
黄玉宝
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujian Institute of Research on the Structure of Matter of CAS
Original Assignee
Fujian Institute of Research on the Structure of Matter of CAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujian Institute of Research on the Structure of Matter of CAS filed Critical Fujian Institute of Research on the Structure of Matter of CAS
Priority to CN201910786154.0A priority Critical patent/CN110531495B/en
Publication of CN110531495A publication Critical patent/CN110531495A/en
Application granted granted Critical
Publication of CN110531495B publication Critical patent/CN110531495B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
    • 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
    • G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
    • G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
    • 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
    • G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
    • G02B13/0075—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element having an element with variable optical properties

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

The invention discloses a single-lens reflex lens, which comprises a variable diaphragm S, a positive focal length first lens group and a negative lens G4, wherein the positive focal length first lens group and the negative lens group are positioned on one side of the variable diaphragm S; the negative lens G4 is positioned between the first lens group and the variable diaphragm S; the variable diaphragm S is arranged on the left side of the lens frame, and the variable diaphragm S is arranged on the right side of the lens frame. Wherein, the third lens group is a triple cemented lens group. When the focal length is 35mm, the maximum aperture can reach about F/1.5, and the invention can be widely applied to the shooting process of a digital camera, especially to portrait shooting. As the plurality of spherical lenses are used in combination, compared with the prior art, the aperture is enlarged, and the technical effect is remarkable. In addition, the invention does not adopt an aspheric lens, thereby reducing the cost. And due to the symmetry of the triple cemented lens group, the processing and assembling cost is further reduced, and the market competition of products is facilitated.

Description

Single lens reflex
Technical Field
The invention relates to the field of optical lenses for photography, in particular to a single lens reflex.
Background
The single lens reflex is a camera in which light irradiates a reflector through a single lens and views through reflection. The aperture in the single lens reflex is an extremely important index parameter. The aperture is a component for controlling the size of the lens aperture to control the depth of field, the quality of the image formed by the lens, and the amount of light entering in cooperation with the shutter.
In general, the aperture size is expressed by F value, and the diameter of the lens cannot be changed freely for the manufactured lens, but the light flux of the lens can be controlled by adding a polygonal or circular aperture-shaped grating with a variable area inside the lens, and the device is called an aperture, and the F value is the focal length/aperture diameter of the lens. The smaller the F value of the aperture, i.e. the larger the aperture of the aperture, the more the light entering amount in the same unit time, i.e. the larger the aperture, the more the light entering amount, the smaller the depth of field, and the brighter the picture; the smaller the aperture, the smaller the amount of light entering, the larger the depth of field, and the darker the picture.
When the single lens reflex is used for shooting a close-up picture, a small depth of field is needed, and one way of reducing the depth of field is to increase the aperture. However, a large aperture causes a problem of high-order aberration, resulting in a decrease in image quality. Therefore, for a large aperture single lens reflex, correction of high order aberrations is required. In the prior art, the aspheric lens can well correct high-level aberration so as to obtain better image quality, but the cost of the single-lens reflex lens is high due to the high price of the aspheric lens.
Disclosure of Invention
Accordingly, the present invention provides a single lens reflex lens, which has a maximum aperture of F/1.5 and does not use an aspheric lens.
In order to achieve the purpose, the invention provides the following technical scheme:
a single lens reflex lens includes a variable diaphragm S, a positive focal length first lens group and a negative lens G4 on one side of the variable diaphragm S; the negative lens G4 is positioned between the first lens group and the variable diaphragm S;
the variable diaphragm S is arranged on the left side of the lens frame, and the variable diaphragm S is arranged on the right side of the lens frame.
As a still further scheme of the invention: the combined focal length of the first lens group meets the following conditions:
fG1+G2+G3≤30mm
wherein f isG1+G2+G3The combined focal length of the first lens group is shown.
As a still further scheme of the invention: the first lens group comprises a positive lens G1, a positive lens G2 and a positive lens G3, and the following conditions are met:
fG1≥90mm，VG1≥50
fG2≥70mm，VG2≥40
fG3≥80mm，VG3≥60
wherein: f. ofG1And VG1Respectively, the focal length and the abbe number of the positive lens G1; f. ofG2And VG2Respectively, the focal length and the abbe number of the positive lens G2; f. ofG3And VG3Respectively, the focal length and the abbe number of the positive lens G3.
As a still further scheme of the invention: the negative lens G4 satisfies the condition: l fG4|≤30mm，VG4Less than or equal to 26; wherein f isG4And VG4Respectively, the focal length and the abbe number of the positive lens G4.
As a still further scheme of the invention: the second lens group is a double-cemented lens group, the double-cemented lens group comprises a negative lens G5 and a positive lens G6, and the following conditions are met:
|fG5|≤40mm，VG5≤26
fG6≤20mm，VG6≥40
wherein: f. ofG5And VG5Respectively, the focal length and the abbe number of the negative lens G5; f. ofG6And VG6Respectively, the focal length and the abbe number of the positive lens G6.
As a still further scheme of the invention: the negative lens G5 is a meniscus negative lens, and the positive lens G6 is a biconvex positive lens.
As a still further scheme of the invention: the third lens group is a triple cemented lens group which comprises a positive lens G7, a negative lens G8 and a positive lens G9, and the combined focal length of the triple cemented lens group meets the following conditions:
fG7+G8+G9≤31mm
wherein f isG7+G8+G9The combined focal length of the third lens group is shown.
As a still further scheme of the invention: the positive lens G7, the negative lens G8, and the positive lens G9 satisfy the following conditions:
nG7＝nG9
VG7＝VG9
RG7A＝|RG9B|
|RG7B|＝|RG8A|＝RG8B＝RG9A
wherein n isG7And VG7Are respectively provided withDenotes the refractive index and Abbe number, n, of the positive lens G7G9And VG9Respectively, the refractive index and the Abbe number, R, of the positive lens G9G7A、RG8AAnd RG9ARadii of the positive lens G7, the negative lens G8, and the positive lens G9 near the object side surface, RG7B、RG8BAnd RG9BRadii of the positive lens G7, the negative lens G8, and the positive lens G9 near the image side surface are respectively indicated.
As a still further scheme of the invention: the positive lens G7 is a biconvex positive lens, the negative lens G8 is a biconcave negative lens, and the positive lens G9 is a biconvex positive lens.
The beneficial effects of the invention include but are not limited to:
(1) the single lens reflex provided by the invention has the advantages that when the focal length is 35mm, the maximum aperture can reach about F/1.5, the depth of field when the object distance is 3 meters is less than or equal to 10mm, and the depth of field is shallow, so that the single lens reflex can be widely applied to the shooting process of a digital camera, especially portrait shooting. As the plurality of spherical lenses are used in combination, compared with the prior art, the aperture is enlarged, and the technical effect is remarkable. In addition, the invention does not adopt an aspheric lens, thereby reducing the cost and having wider application.
(2) The present invention employs a triple cemented lens group to reduce the high order aberrations generated when the through-aperture is large, as compared to the conventional use of an aspherical lens to correct the high order aberrations generated when the through-aperture is large. Meanwhile, due to the symmetry of the triple cemented lens group, the processing and assembling cost is reduced, and the market competition of products is facilitated.
(3) The single-lens reflex provided by the invention has the advantages that the full field angle is about 42 degrees, the relative illumination is more than or equal to 0.3, the distortion is less than or equal to 1%, the purple-edge magnification chromatic aberration is less than or equal to 20 mu m, the transfer function of 30lp/mm of a 0.7 field is more than or equal to 0.5, and the image quality is higher.
Drawings
FIG. 1 is a diagram of an optical system of a single lens reflex according to the present invention;
fig. 2 is a modulation transfer function diagram of a single lens reflex provided in embodiment 1 of the present invention at 60lp/mm, where T1 denotes a meridional direction, and S1 denotes a sagittal direction;
FIG. 3 is a chromatic aberration of magnification of the single lens reflex provided in embodiment 1 of the present invention in a wavelength range of 0.45 μm to 0.65 μm;
fig. 4 is a distortion diagram of a single lens reflex according to embodiment 1 of the present invention;
fig. 5 is a diagram of relative illuminance of an slr lens according to embodiment 1 of the present invention;
fig. 6 is a diagram of a defocus transfer function of the single lens reflex provided in embodiment 1 of the present invention;
fig. 7 is a diagram of an actual imaging effect of the single lens reflex provided in embodiment 1 of the present invention.
Detailed Description
The present invention will be described in detail with reference to examples, but the present invention is not limited to these examples.
FIG. 1 is a diagram of an optical system of a single lens reflex lens according to the present invention, as shown in FIG. 1, the single lens reflex lens includes a variable diaphragm S, a positive focal length first lens group and a negative lens G4 on one side of the variable diaphragm S; the negative lens G4 is positioned between the first lens group and the variable diaphragm S;
the variable diaphragm S is arranged on the left side of the lens frame, and the variable diaphragm S is arranged on the right side of the lens frame.
In order to reduce spherical aberration and chromatic aberration while converging light, the invention adopts a method for separating focal power, and a first lens group is provided with three lenses, and the three lenses are respectively arranged from the object side to the image surface side in the following sequence: positive lens G1, positive lens G2, positive lens G3. The combined focal length of the first lens group meets the following conditions: f. ofG1+G2+G3Less than or equal to 30 mm. The three lenses satisfy the following conditions:
fG1≥90mm，VG1≥50
fG2≥70mm，VG2≥40
fG3≥80mm，VG3≥60
wherein: f. ofG1+G2+G3Representing the combined focal length of the first lens group; f. ofG1And VG1Respectively, the focal length and the abbe number of the positive lens G1; f. ofG2And VG2Each representing the focus of the positive lens G2Distance and dispersion coefficient; f. ofG3And VG3Respectively, the focal length and the abbe number of the positive lens G3.
In order to reduce the chromatic aberration generated by the three positive lenses of the first lens group, the negative lens G4 is configured to satisfy the following conditions: l fG4|≤30mm，VG4Less than or equal to 26; wherein f isG4And VG4Respectively, the focal length and the abbe number of the positive lens G4.
The second lens group comprises two lenses, and the two lenses are respectively as follows from the object side to the image surface side: the negative lens G5 and the positive lens G6 form a double cemented lens group. The negative lens G5 can correct curvature of field and chromatic aberration generated by the positive lens behind the lens, and the positive lens G6 can converge divergent light rays generated by the negative lens G4 and the negative lens G5. The two lenses respectively satisfy the following conditions:
|fG5|≤40mm，VG5≤26
fG6≤20mm，VG6≥40
wherein: f. ofG5And VG5Respectively, the focal length and the abbe number of the negative lens G5; f. ofG6And VG6Respectively, the focal length and the abbe number of the positive lens G6.
The third lens group is a three-cemented lens group which is formed by respectively cementing two positive lenses at two sides of a negative lens. The three lenses are respectively arranged from the object side to the image surface side as follows: positive lens G7, negative lens G8, positive lens G9. The triple cemented lens group can converge light to an image plane and correct high-level aberration generated by large aperture. The combined focal length satisfies the following conditions:
fG7+G8+G9≤31mm
wherein f isG7+G8+G9The combined focal length of the third lens group is shown.
In the present embodiment, in order to reduce the processing cost, the three lenses satisfy the following conditions:
nG7＝nG9
VG7＝VG9
RG7A＝|RG9B|
|RG7B|＝|RG8A|＝RG8B＝RG9A
wherein n isG7And VG7Respectively representing the refractive index and the Abbe number, n, of the positive lens G7G9And VG9Respectively, the refractive index and the Abbe number, R, of the positive lens G9G7A、RG8AAnd RG9ARadii of the positive lens G7, the negative lens G8, and the positive lens G9 near the object side surface, RG7B、RG8BAnd RG9BRadii of the positive lens G7, the negative lens G8, and the positive lens G9 near the image side surface are respectively indicated.
Under the above conditions, although this lens requires 9 lenses, the positive lens G7 is identical to the positive lens G9, and therefore, this corresponds to processing only 8 lens sets. And, also because of RG7A＝|RG9BI and I RG8A|＝RG8BTherefore, the front side and the back side of the three-rubber-combined piece do not need to be considered during assembly, and the assembly cost is reduced.
When the focal length of the single reflection lens is 35mm, the maximum aperture can reach about F/1.5, the single reflection lens can be widely applied to the shooting process of a digital camera, especially portrait shooting, the problems of small aperture of the lens and high cost caused by using an aspheric glass lens in the prior art are solved, and the processing and assembling cost is further reduced by adopting the triple cemented lens group and utilizing the symmetry of the triple cemented lens group.
Example 1:
in this embodiment, the combined focal length of the first lens group is 29.8mm, wherein the positive lens G1 is a plano-convex positive lens, the positive lens G2 is a crescent positive lens, and the positive lens G3 is a crescent positive lens. The specific values of the plano-convex positive lens G1, the crescent positive lens G2 and the crescent positive lens G3 are as follows:
fG1＝106.3mm，VG1＝53.9
fG2＝76.1mm，VG2＝42.7
fG3＝91.2mm，VG3＝68.6
the negative lens G4 is a meniscus negative lens, and has the following values:
|fG4|＝28.9mm，VG4＝25.7
the negative lens G5 of the second lens group is a negative meniscus lens with a focal length and an Abbe number of fG5|＝17.9mm，VG525.0; the positive lens G6 is a biconvex positive lens with a focal length and an Abbe number fG6＝19.9mm，VG6＝40.8。
The positive lens G7 of the third lens group is a biconvex positive lens, the negative lens G8 is a biconcave negative lens, the positive lens G9 is a biconvex positive lens, and the combined focal length of the third lens group is fG7+G8+G9＝30.2mm，RG7A＝|RG9B|＝111.09，|RG7B|＝|RG8A|＝RG8B＝RG9A＝33.146。
In this embodiment, the air space between the plano-convex positive lens G1 and the crescent positive lens G2 is 0.10 mm; the air space between the crescent positive lens G2 and the crescent positive lens G3 is 0.10 mm; the air space between the crescent positive lens G3 and the crescent negative lens G4 is 2.08 mm; the air space between the negative meniscus lens G4 and the variable diaphragm S is 4.80 mm; the air space between the iris S and the meniscus negative lens G5 was 6.51 mm; the air space between the double convex positive lens G6 and the double convex positive lens G7 was 0.1 mm.
In this example, the parameters of each lens are shown in table 1.
Table 1 parameters of each lens of example 1
Figure BDA0002178098100000061
Fig. 2 to 7 show parameters of the single lens reflex of the present embodiment, which are generated by ray tracing using optical design software ZEMAX, CODEV or SIGMA. As can be seen from FIG. 2, the transfer functions of the 0.7 field meridian T1 and the sagittal S1 at 30lp/mm are both greater than 0.65, the tolerance of the actual assembled lens is less than 0.15, and therefore the transfer function of the actual lens at 30lp/mm at 0.7 field is greater than or equal to 0.5; as can be seen from FIG. 3, the chromatic aberration of magnification of the full field of view is less than 20 μm, and the purple edge of the lens under this condition is very small; as can be seen from fig. 4, the distortion of the full field is less than 1%, and the tolerance hardly affects the distortion according to experience, so that the distortion of the actual lens is also less than 1%; as can be seen from fig. 5, the relative illumination of the full field of view is greater than 30%, and decreases slowly with the field of view, in this case, the camera will automatically balance the exposure brightness, and the dark corner will not occur; as can be seen from fig. 6, the depth of focus is about 0.1mm (the depth of focus is defined herein as the range where the 30lp/mm transfer function falls to 0.2), and the magnification for an object distance of 3 meters is the focal length/object distance of 0.012, so the depth of field is 0.1 mm/0.012-8.33 mm, which satisfies the design requirements. As can be seen from fig. 7, the depth of field of the actual photographing effect is obvious, and the same object placed 50mm behind the photographed object is completely unclear.
When the focal length of the single reflection lens is 35mm, the maximum aperture can reach about F/1.5, the single reflection lens can be widely applied to the shooting process of a digital camera, especially portrait shooting, the problems of small aperture of the lens and high cost caused by using an aspheric glass lens in the prior art are solved, and the processing and assembling cost is further reduced by adopting the triple cemented lens group and utilizing the symmetry of the triple cemented lens group.
Example 2:
in this embodiment, the combined focal length of the first lens group is 30.0mm, wherein the positive lens G1 is a plano-convex positive lens, the positive lens G2 is a crescent positive lens, and the positive lens G3 is a crescent positive lens. The specific values of the plano-convex positive lens G1, the crescent positive lens G2 and the crescent positive lens G3 are as follows:
fG1＝99.1mm，VG1＝53.9
fG2＝84.9mm，VG2＝42.7
fG3＝87.7mm，VG3＝68.6
the negative lens G4 is a meniscus negative lens, and has the following values:
|fG4|＝28.9mm，VG4＝25.7
the negative lens G5 of the second lens group is a negative meniscus lens with a focal length and an Abbe number of fG5|＝32.8mm，VG525.0; the positive lens G6 is a biconvex positive lens with a focal length and an Abbe number fG6＝19.7mm，VG6＝40.8。
Third stepThe positive lens G7 in the lens group is a biconvex positive lens, the negative lens G8 is a biconcave negative lens, the positive lens G9 is a biconvex positive lens, and the combined focal length of the third lens group is fG7+G8+G9＝30.4mm，RG7A＝|RG9B|＝100.82，|RG7B|＝|RG8A|＝RG8B＝RG9A＝36.90。
In this embodiment, the air space between the plano-convex positive lens G1 and the crescent positive lens G2 is 0.10 mm; the air space between the crescent positive lens G2 and the crescent positive lens G3 is 0.10 mm; the air space between the crescent positive lens G3 and the crescent negative lens G4 is 2.56 mm; the air space between the negative meniscus lens G4 and the variable diaphragm S is 4.82 mm; the air space between the iris S and the meniscus negative lens G5 was 6.61 mm; the air space between the double convex positive lens G6 and the double convex positive lens G7 was 0.15 mm.
In this example, the parameters of each lens are shown in table 2.
Table 2 parameters of each lens of example 2
Figure BDA0002178098100000081
When the focal length of the single reflection lens is 35mm, the maximum aperture can reach about F/1.5, the single reflection lens can be widely applied to the shooting process of a digital camera, especially portrait shooting, the problems of small aperture of the lens and high cost caused by using an aspheric glass lens in the prior art are solved, and the processing and assembling cost is further reduced by adopting the triple cemented lens group and utilizing the symmetry of the triple cemented lens group.
Example 3:
in this embodiment, the combined focal length of the first lens group is 30.0mm, wherein the positive lens G1 is a plano-convex positive lens, the positive lens G2 is a crescent positive lens, and the positive lens G3 is a crescent positive lens. The specific values of the plano-convex positive lens G1, the crescent positive lens G2 and the crescent positive lens G3 are as follows:
fG1＝97.4mm，VG1＝53.9
fG2＝85.3mm，VG2＝42.7
fG3＝88.45mm，VG3＝68.6
the negative lens G4 is a meniscus negative lens, and has the following values:
|fG4|＝28.9mm，VG4＝25.7
the negative lens G5 of the second lens group is a negative meniscus lens with a focal length and an Abbe number of fG5|＝32.9mm，VG525.0; the positive lens G6 is a biconvex positive lens with a focal length and an Abbe number fG6＝19.7mm，VG6＝40.8。
The positive lens G7 of the third lens group is a biconvex positive lens, the negative lens G8 is a biconcave negative lens, the positive lens G9 is a biconvex positive lens, and the combined focal length of the third lens group is fG7+G8+G9＝30.4mm，RG7A＝|RG9B|＝101.57，|RG7B|＝|RG8A|＝RG8B＝RG9A＝36.68。
In this embodiment, the air space between the plano-convex positive lens G1 and the crescent positive lens G2 is 0.10 mm; the air space between the crescent positive lens G2 and the crescent positive lens G3 is 0.10 mm; the air space between the crescent positive lens G3 and the crescent negative lens G4 is 2.57 mm; the air space between the negative meniscus lens G4 and the variable diaphragm S is 4.81 mm; the air space between the iris S and the meniscus negative lens G5 was 6.61 mm; the air space between the double convex positive lens G6 and the double convex positive lens G7 was 0.1 mm.
In this example, the parameters of each lens are shown in table 3.
Table 3 parameters of each lens of example 3
Figure BDA0002178098100000091
When the focal length of the single reflection lens is 35mm, the maximum aperture can reach about F/1.5, the single reflection lens can be widely applied to the shooting process of a digital camera, especially portrait shooting, the problems of small aperture of the lens and high cost caused by using an aspheric glass lens in the prior art are solved, and the processing and assembling cost is further reduced by adopting the triple cemented lens group and utilizing the symmetry of the triple cemented lens group.
The above description is only for the purpose of illustrating the present invention and is not intended to limit the present invention in any way, and the present invention is not limited to the above description, but rather should be construed as being limited to the scope of the present invention.

Claims (8)

1. A single lens reflex lens includes a variable diaphragm S, a positive focal length first lens group and a negative lens G4 on one side of the variable diaphragm S; the negative lens G4 is positioned between the first lens group and the variable diaphragm S;
the second lens group is positioned between the variable diaphragm S and the third lens group;
the combined focal length of the first lens group meets the following conditions:
fG1+G2+G3≤30mm
wherein f isG1+G2+G3The combined focal length of the first lens group is shown.
2. The single lens reflex lens set as recited in claim 1, wherein the first lens group includes a positive lens G1, a positive lens G2, and a positive lens G3, and the following condition is satisfied:
fG1≥90mm，VG1≥50
fG2≥70mm，VG2≥40
fG3≥80mm，VG3≥60
wherein: f. ofG1And VG1Respectively, the focal length and the abbe number of the positive lens G1; f. ofG2And VG2Respectively, the focal length and the abbe number of the positive lens G2; f. ofG3And VG3Respectively, the focal length and the abbe number of the positive lens G3.
3. The single lens reflex as recited in claim 1, wherein the negative lens G4 satisfies a condition: l fG4|≤30mm，VG4Less than or equal to 26; wherein f isG4And VG4Respectively, the focal length and the abbe number of the positive lens G4.
4. The single lens reflex lens assembly as recited in claim 1, wherein the second lens group is a double cemented lens group, the double cemented lens group comprising a negative lens G5 and a positive lens G6, wherein the following conditions are satisfied:
|fG5|≤40mm，VG5≤26
fG6≤20mm，VG6≥40
wherein: f. ofG5And VG5Respectively, the focal length and the abbe number of the negative lens G5; f. ofG6And VG6Respectively, the focal length and the abbe number of the positive lens G6.
5. The single lens reflex as recited in claim 4, wherein the negative lens G5 is a meniscus negative lens, and the positive lens G6 is a double convex positive lens.
6. The single lens reflex lens set of claim 1, wherein the third lens group is a triple cemented lens group comprising a positive lens G7, a negative lens G8 and a positive lens G9, and the combined focal length thereof satisfies the following condition:
fG7+G8+G9≤31mm
wherein f isG7+G8+G9The combined focal length of the third lens group is shown.
7. The single lens reflex as recited in claim 6, wherein the positive lens G7, the negative lens G8, the positive lens G9 satisfy the following conditions:
nG7＝nG9
VG7＝VG9
RG7A＝|RG9B|
|RG7B|＝|RG8A|＝RG8B＝RG9A
wherein n isG7And VG7Respectively representing the refractive index and the Abbe number, n, of the positive lens G7G9And VG9Respectively, the refractive index and the Abbe number, R, of the positive lens G9G7A、RG8AAnd RG9ARadii of the positive lens G7, the negative lens G8, and the positive lens G9 near the object side surface, RG7B、RG8BAnd RG9BRadii of the positive lens G7, the negative lens G8, and the positive lens G9 near the image side surface are respectively indicated.
8. The single lens reflex as recited in claim 7, wherein the positive lens G7 is a double convex positive lens, the negative lens G8 is a double concave negative lens, and the positive lens G9 is a double convex positive lens.
CN201910786154.0A 2019-08-23 2019-08-23 Single lens reflex Active CN110531495B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910786154.0A CN110531495B (en) 2019-08-23 2019-08-23 Single lens reflex

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910786154.0A CN110531495B (en) 2019-08-23 2019-08-23 Single lens reflex

Publications (2)

Publication Number Publication Date
CN110531495A CN110531495A (en) 2019-12-03
CN110531495B true CN110531495B (en) 2020-07-31

Family

ID=68664121

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910786154.0A Active CN110531495B (en) 2019-08-23 2019-08-23 Single lens reflex

Country Status (1)

Country Link
CN (1) CN110531495B (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003177316A (en) * 2001-12-11 2003-06-27 Olympus Optical Co Ltd Image pickup device
JP3482155B2 (en) * 1999-05-25 2003-12-22 ペンタックス株式会社 Zoom lens system

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63194214A (en) * 1987-02-06 1988-08-11 Asahi Optical Co Ltd Telephoto photographic lens
JP6204896B2 (en) * 2014-09-24 2017-09-27 富士フイルム株式会社 Imaging lens and imaging apparatus
JP6388853B2 (en) * 2015-07-10 2018-09-12 富士フイルム株式会社 Imaging lens and imaging apparatus
CN105676428B (en) * 2016-04-12 2017-12-15 广东弘景光电科技股份有限公司 A kind of ultra-wide angle optical system and its camera lens of application
TWI742038B (en) * 2016-04-20 2021-10-11 佳能企業股份有限公司 Optical lens
CN105866932B (en) * 2016-05-30 2018-07-03 广东弘景光电科技股份有限公司 High pixel day and night confocal panoramic shooting optical system and its camera lens of application
CN206804976U (en) * 2017-04-07 2017-12-26 深圳市永诺摄影器材股份有限公司 A kind of camera tight shot and camera

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3482155B2 (en) * 1999-05-25 2003-12-22 ペンタックス株式会社 Zoom lens system
JP2003177316A (en) * 2001-12-11 2003-06-27 Olympus Optical Co Ltd Image pickup device

Also Published As

Publication number Publication date
CN110531495A (en) 2019-12-03

Similar Documents

Publication Publication Date Title
CN111190317B (en) Imaging optical lens assembly, image capturing device and electronic device
TWI460464B (en) Imaging lens assembly
CN105700117B (en) A kind of optical imaging system
CN109471251B (en) Near infrared zoom lens with embedded liquid lens component
CN110716288B (en) Optical imaging lens
CN110261999B (en) Optical system and imaging lens
CN107894649A (en) One kind is taken photo by plane camera lens
CN109445075A (en) A kind of Miniature projection lens
CN104570286A (en) Micro fisheye camera lens and head-mounted display equipment
CN104142569A (en) Small-size, high-resolution and large-image-surface zoom optical system
CN107918200A (en) Imaging len and camera device
CN108681052B (en) High-resolution, large-image-plane, small-volume and infrared confocal zoom optical system
CN107450168B (en) In dolly-out, dolly-back interchangeable tight shot
CN113253420B (en) Wide-angle large-aperture non-reflection camera and fixed-focus lens
CN106094183A (en) Focusing-style optical imaging system in a kind of high picture element
CN207529005U (en) One kind is taken photo by plane camera lens
CN110531495B (en) Single lens reflex
CN110837179A (en) Wide-angle adapter lens of projection lens
CN113281889B (en) Micro-distance microscopic optical imaging system, imaging module and mobile phone
CN115390225A (en) Optical lens
CN113835203A (en) Large-light-transmission high-illumination projection lens matched with 0.47DMD
CN208580256U (en) Telephoto lens
CN207396840U (en) Zoom lens, projection type image display apparatus and photographic device
CN112305717A (en) Fixed focus lens
JP2004102100A (en) Retrofocus superwide-angle lens

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant