CN113866960B - Optical imaging lens system - Google Patents
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- CN113866960B CN113866960B CN202111454296.0A CN202111454296A CN113866960B CN 113866960 B CN113866960 B CN 113866960B CN 202111454296 A CN202111454296 A CN 202111454296A CN 113866960 B CN113866960 B CN 113866960B
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Abstract
The present disclosure provides an optical imaging lens system, including: the lens comprises a first lens, a second lens, a third lens, a first lens group, a second lens group and a third lens group which are sequentially arranged from an object side to an image side; the first lens group comprises a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object side to an image side; the second lens group comprises a seventh lens and an eighth lens which are sequentially arranged from the object side to the image side; the third lens group comprises a ninth lens and a tenth lens which are sequentially arranged from the object side to the image side; the focal length of the first lens meets 1.20< | f1/f | < 1.30; the focal length of the second lens meets 1.25< | f2/f | < 1.35; the focal length of the third lens meets 0.40< | f3/f | < 0.50; the focal length of the first lens group satisfies 0.75< | fG1/f | < 1.0; the focal length of the second lens group satisfies 10.0< | fG2/f | < 12.0; the focal length of the third lens group satisfies 1.60< | fG3/f | < 1.70.
Description
Technical Field
The present disclosure relates to the field of machine vision technology, and in particular, to an optical imaging lens system.
Background
As the resolution of cameras is higher and higher, higher and higher requirements are also put on the sharpness of optical imaging lens systems adapted to the cameras. For example, an optical imaging lens system used in combination with an 8K line scan camera having a pixel size of 7 μm (micrometer) requires that Modulation Transfer Function (MTF) parameters of the optical imaging lens system can reach 70lp/mm >0.3, i.e., the MTF is greater than 0.3 when the resolution is 70 lp/mm; wherein lp/mm is short for line-pairs/mm, and means the number of lines between black and white lines that can be resolved at a distance of 1 mm on the imaging plane, which is the unit of resolution. If the resolution of the optical imaging lens system is lower than the requirement of a camera, the imaging contrast is low, and the image definition is insufficient. Therefore, an optical imaging lens system with MTF parameter reaching 70lp/mm >0.3 requirement is also provided.
Disclosure of Invention
In order to solve at least the above technical problems in the prior art, embodiments of the present disclosure provide an optical imaging lens system.
An aspect of the disclosed embodiments provides an optical imaging lens system, including: the lens comprises a first lens, a second lens, a third lens, a first lens group, a second lens group and a third lens group which are sequentially arranged from an object side to an image side; the first lens group comprises a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object side to an image side; the second lens group comprises a seventh lens and an eighth lens which are sequentially arranged from an object side to an image side; the third lens group comprises a ninth lens and a tenth lens which are sequentially arranged from the object side to the image side;
the focal length f1 of the first lens meets 1.20< | f1/f | 1.30, wherein f represents the focal length of the optical imaging lens system;
the focal length f2 of the second lens meets 1.25< | f2/f | < 1.35;
the focal length f3 of the third lens meets 0.40< | f3/f | < 0.50;
the focal length G1 of the first lens group satisfies 0.75< | fG1/f | < 1.0;
the focal length G2 of the second lens group satisfies 10.0< | fG2/f | < 12.0;
the focal length G3 of the third lens group satisfies 1.60< | fG3/f | 1.70.
In an implementation manner, the optical imaging lens system further includes a diaphragm located between the sixth lens and the seventh lens, where the diaphragm is a circular hole that is light-permeable, and a diameter of the circular hole satisfies a relative aperture of F5.6.
In one embodiment, the first lens is a meniscus lens, the optical power is positive, the refractive index is greater than 1.95 and less than 2.05, and the abbe number is greater than 25 and less than 30.
In one embodiment, the second lens is a meniscus lens with a positive optical power, a refractive index greater than 1.85 and less than 1.95, and an abbe number greater than 32 and less than 40.
In one embodiment, the third lens is a meniscus lens, the optical power is negative, the refractive index is greater than 1.55 and less than 1.65, and the abbe number is greater than 32 and less than 40.
In one embodiment, the fourth lens is a biconcave lens with negative refractive power, a refractive index greater than 1.45 and less than 1.55, and an abbe number greater than 65 and less than 75.
In one embodiment, the fifth lens is a biconvex lens, the focal power is positive, the refractive index is greater than 1.55 and less than 1.65, and the abbe number is greater than 55 and less than 65.
In one embodiment, the sixth lens is a meniscus lens, the optical power is negative, the refractive index is greater than 1.85 and less than 1.95, and the abbe number is greater than 15 and less than 20.
In one embodiment, the seventh lens is a meniscus lens, the optical power is positive, the refractive index is greater than 1.85 and less than 1.95, and the abbe number is greater than 15 and less than 20.
In one embodiment, the eighth lens is a biconcave lens with negative optical power, a refractive index greater than 1.65 and less than 1.75, and an abbe number greater than 25 and less than 30.
In one embodiment, the ninth lens is a meniscus lens, the optical power is positive, the refractive index is greater than 1.65 and less than 1.75, and the abbe number is greater than 50 and less than 60.
In one embodiment, the tenth lens is a meniscus lens, the optical power is negative, the refractive index is greater than 1.95 and less than 2.05, and the abbe number is greater than 25 and less than 30.
In one embodiment, the optical imaging lens system employs a fixed aperture.
In an implementation manner, the fourth lens and the fifth lens, and the fifth lens and the sixth lens are respectively connected by gluing; and/or the seventh lens and the eighth lens are connected in a gluing way; and/or the ninth lens and the tenth lens are connected in a gluing mode.
In one embodiment, the optical imaging lens system has an image plane size of 60mm, a focal length of 60mm, an aperture of F5.6, a working distance of 0.3m-inf, and a magnification of 0-0.2 x.
The optical imaging lens system provided by the embodiment of the disclosure solves the problem of lens imaging definition, and can realize that the MTF parameter is improved to more than 0.6 when the MTF parameter is 50lp/mm and more than 0.4 when the MTF parameter is 70lp/mm, namely the MTF parameter is more than 0.6 when the MTF parameter is 50lp/mm and the MTF parameter is more than 0.4 when the MTF parameter is 70 lp/mm.
Drawings
The above and other objects, features and advantages of exemplary embodiments of the present disclosure will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present disclosure are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which:
in the drawings, the same or corresponding reference numerals indicate the same or corresponding parts.
Fig. 1 is a schematic structural diagram of an optical imaging lens system according to an embodiment of the disclosure;
fig. 2 is a schematic MTF curve of an embodiment of the disclosure.
Detailed Description
In order to make the objects, features and advantages of the present disclosure more apparent and understandable, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure, and it is apparent that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
The present disclosure provides a high-definition optical imaging lens system, as shown in fig. 1, including: a first lens L1, a second lens L2, a third lens L3, a first lens group G1, a second lens group G2 and a third lens group G3 which are arranged in sequence from an object side to an image side; the first lens group G1 includes a fourth lens L4, a fifth lens L5, and a sixth lens L6 arranged in order from the object side to the image side; the second lens group G2 includes a seventh lens L7 and an eighth lens L8 arranged in order from the object side to the image side; the third lens group G3 includes a ninth lens L9 and a tenth lens L10 arranged in order from the object side to the image side. The sequential arrangement from the object side to the image side means that the arrangement order of the lenses in the optical imaging lens system is sequentially arranged according to the order of extending the system from the object to be shot to the imaging direction in actual use.
As can be seen from fig. 1, the second lens L2 is adjacent to the first lens L1, the third lens L3 is adjacent to the second lens L2, the first lens group G1 composed of the fourth lens L4, the fifth lens L5 and the sixth lens L6 is adjacent to the third lens L3 in a mounted positional relationship, and the second lens group G2 composed of the seventh lens L7 and the eighth lens L8 is adjacent to the sixth lens L6 of the first lens group G1 in a mounted positional relationship, and the third lens group G3 composed of the ninth lens L9 and the tenth lens L10 is adjacent to the eighth lens L8 of the second lens group G2 in a mounted positional relationship. The installation manner of each lens in the optical imaging lens system belongs to the conventional technology in the field, and the detailed description of the embodiments of the present disclosure is omitted.
Wherein the focal length f1 of the first lens meets 1.20< | f1/f | 1.30, f represents the focal length of the optical imaging lens system;
the focal length f2 of the second lens meets 1.25< | f2/f | < 1.35;
the focal length f3 of the third lens meets 0.40< | f3/f | < 0.50;
the focal length G1 of the first lens group satisfies 0.75< | fG1/f | < 1.0;
the focal length G2 of the second lens group satisfies 10.0< | fG2/f | < 12.0;
the focal length G3 of the third lens group satisfies 1.60< | fG3/f | 1.70.
The optical imaging lens system realized by the mode can reach enough definition, and the MTF parameter is at least improved to more than 0.3 when 70 lp/mm.
In an implementation manner, the optical imaging lens system of the embodiment of the disclosure further includes a diaphragm 100 located between the sixth lens L6 and the seventh lens L7, the diaphragm 100 is a circular hole with light transmittance, a diameter of the circular hole satisfies F5.6 relative aperture, and the relative aperture refers to a ratio of a focal length F of the optical imaging lens system to a diameter D of an effective aperture D of the diaphragm 100 imaged by the L1 to L6 lens groups. The aperture 100 is used for passing light, and the size of the light passing aperture can be used to control the amount of light energy passing through and also to control the aperture-related aberrations.
In one embodiment, the first lens L1 is a meniscus lens with positive optical power, a refractive index greater than 1.95 and less than 2.05, and an abbe number greater than 25 and less than 30.
In one embodiment, the second lens L2 is a meniscus lens with positive optical power, a refractive index greater than 1.85 and less than 1.95, and an abbe number greater than 32 and less than 40.
In one embodiment, the third lens L3 is a meniscus lens with negative power, a refractive index greater than 1.55 and less than 1.65, and an abbe number greater than 32 and less than 40.
In one embodiment, the fourth lens L4 is a biconcave lens with negative refractive power, a refractive index greater than 1.45 and less than 1.55, and an abbe number greater than 65 and less than 75.
In one embodiment, the fifth lens is a biconvex lens, the focal power is positive, the refractive index is greater than 1.55 and less than 1.65, and the abbe number is greater than 55 and less than 65.
In one embodiment, the sixth lens is a meniscus lens, the optical power is negative, the refractive index is greater than 1.85 and less than 1.95, and the abbe number is greater than 15 and less than 20.
In one embodiment, the seventh lens is a meniscus lens, the optical power is positive, the refractive index is greater than 1.85 and less than 1.95, and the abbe number is greater than 15 and less than 20.
In one embodiment, the eighth lens is a biconcave lens with negative refractive power, a refractive index greater than 1.65 and less than 1.75, and an abbe number greater than 25 and less than 30.
In one embodiment, the ninth lens is a meniscus lens, the optical power is positive, the refractive index is greater than 1.65 and less than 1.75, and the abbe number is greater than 50 and less than 60.
In one embodiment, the tenth lens is a meniscus lens, the power is negative, the refractive index is greater than 1.95 and less than 2.05, and the abbe number is greater than 25 and less than 30.
In one embodiment, the optical imaging lens system employs a fixed aperture. Adopt fixed light ring, compare the scheme that adopts adjustable light ring, when many equipment of actual project were under construction, more can guarantee the uniformity of light ring size, avoid adjusting the individual difference that the nonconformity leads to because of the constructor to reduce the trouble of follow-up maintenance.
In one embodiment, the fourth lens L4 and the fifth lens L5, and the fifth lens L5 and the sixth lens L6 are respectively connected by gluing; and/or the presence of a gas in the gas,
the seventh lens L7 and the eighth lens L8 are connected in a gluing mode; and/or the presence of a gas in the gas,
the ninth lens L9 and the tenth lens L10 are connected by gluing. The first lens group G1 adopting the cemented joint method is also called a triple cemented lens group, and the second lens group G2 and the third lens group adopting the cemented joint method are also called a double cemented lens group. The advantages of the glued connection are that the connection is simple and that instability of the system caused by introducing errors of the structural parts is avoided.
In this embodiment, the parameters related to the optical imaging lens system are as follows:
| surface of | Radius of curvature (mm) | Refractive index | Abbe number | Thickness (mm) |
| Front surface of first lens L1 | 24.7 | 2.0 | 28 | 3.8 |
| Rear surface of first lens L1 | 33.9 | 0.1 | ||
| Front surface of second lens L2 | 26.2 | 1.9 | 35.8 | 3.4 |
| Rear surface of second lens L2 | 38.8 | 0.1 | ||
| Front surface of third lens L3 | 38.1 | 1.6 | 35.9 | 1.0 |
| Rear surface of third lens L3 | 11.3 | 10.3 | ||
| Front surface of fourth lens L4 | -233.1 | 1.5 | 71.5 | 1.0 |
| Front surface of fifth lens L5 | 7.9 | 1.6 | 61.9 | 4.4 |
| Front surface of sixth lens L6 | -15.6 | 1.9 | 18.4 | 1.0 |
| Rear surface of sixth lens L6 | -31.8 | 0.1 | ||
| STO (diaphragm) | Infinity(s) | 0.2 | ||
| Front surface of seventh lens L7 | -147.0 | 1.9 | 18.1 | 8.5 |
| Front surface of eighth lens L8 | -14.8 | 1.7 | 27.4 | 1.0 |
| Rear surface of eighth lens L8 | 75.7 | 1.0 | ||
| Front surface of ninth lens L9 | -37.2 | 1.7 | 55.7 | 4.3 |
| Front surface of tenth lens L10 | -9.1 | 2.0 | 27.2 | 5.1 |
| Rear surface of tenth lens L10 | -18.3 | 63.9 |
The overall parameters of the optical imaging lens system of the embodiment of the disclosure are as follows: the size of an image plane is 60mm, the focal length is 60mm, the aperture is F5.6, the working distance is 0.3m-inf, and the magnification is 0-0.2 x. Wherein the working distance is 0.3m-inf, and the working distance is 0.3mm to infinity.
Through the optical imaging lens system provided by the embodiment of the disclosure, the problem of lens imaging definition is solved. As shown in the MTF curve of fig. 2, the horizontal axis represents resolution, and the vertical axis represents Optical Transfer Function (OTF) mode value, it can be seen from fig. 2 that the MTF parameter is improved to more than 0.6 at 50lp/mm and more than 0.4 at 70lp/mm, i.e. the MTF is greater than 0.6 at 50lp/mm and greater than 0.4 at 70 lp/mm. The optical imaging lens system provided by the embodiment of the disclosure can be adapted to an 8K line scan camera with a pixel size of 7 micrometers (microns), even a camera with higher requirements on definition.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present disclosure, "a plurality" means two or more unless specifically limited otherwise.
The above is only a specific embodiment of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present disclosure, and shall be covered by the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (15)
1. An optical imaging lens system comprising: the lens comprises a first lens, a second lens, a third lens, a first lens group, a second lens group and a third lens group which are sequentially arranged from an object side to an image side; the first lens group comprises a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object side to an image side; the second lens group comprises a seventh lens and an eighth lens which are sequentially arranged from an object side to an image side; the third lens group comprises a ninth lens and a tenth lens which are sequentially arranged from the object side to the image side;
the focal length f1 of the first lens meets 1.20< | f1/f | 1.30, wherein f represents the focal length of the optical imaging lens system;
the focal length f2 of the second lens meets 1.25< | f2/f | < 1.35;
the focal length f3 of the third lens meets 0.40< | f3/f | < 0.50;
the focal length G1 of the first lens group satisfies 0.75< | fG1/f | < 1.0;
the focal length G2 of the second lens group satisfies 10.0< | fG2/f | < 12.0;
the focal length G3 of the third lens group satisfies 1.60< | fG3/f | 1.70.
2. The optical imaging lens system of claim 1, further comprising a diaphragm located between the sixth lens and the seventh lens, wherein the diaphragm is a circular hole capable of transmitting light, and the diameter of the circular hole satisfies F5.6 relative aperture.
3. The optical imaging lens system according to claim 1 or 2, wherein the first lens is a meniscus lens, the optical power is positive, the refractive index is greater than 1.95 and less than 2.05, and the abbe number is greater than 25 and less than 30.
4. The optical imaging lens system according to claim 1 or 2, wherein the second lens is a meniscus lens, the optical power is positive, the refractive index is greater than 1.85 and less than 1.95, and the abbe number is greater than 32 and less than 40.
5. The optical imaging lens system according to claim 1 or 2, wherein the third lens is a meniscus lens, the optical power is negative, the refractive index is greater than 1.55 and less than 1.65, and the abbe number is greater than 32 and less than 40.
6. The optical imaging lens system according to claim 1 or 2, wherein the fourth lens is a biconcave lens, the optical power is negative, the refractive index is greater than 1.45 and less than 1.55, and the abbe number is greater than 65 and less than 75.
7. The optical imaging lens system according to claim 1 or 2, wherein the fifth lens is a biconvex lens, has a positive optical power, a refractive index of more than 1.55 and less than 1.65, and an abbe number of more than 55 and less than 65.
8. The optical imaging lens system according to claim 1 or 2, wherein the sixth lens is a meniscus lens, the optical power is negative, the refractive index is greater than 1.85 and less than 1.95, and the abbe number is greater than 15 and less than 20.
9. The optical imaging lens system according to claim 1 or 2, wherein the seventh lens is a meniscus lens, the optical power is positive, the refractive index is greater than 1.85 and less than 1.95, and the abbe number is greater than 15 and less than 20.
10. The optical imaging lens system according to claim 1 or 2, wherein the eighth lens is a biconcave lens, the optical power is negative, the refractive index is greater than 1.65 and less than 1.75, and the abbe number is greater than 25 and less than 30.
11. The optical imaging lens system according to claim 1 or 2, wherein the ninth lens is a meniscus lens, the optical power is positive, the refractive index is greater than 1.65 and less than 1.75, and the abbe number is greater than 50 and less than 60.
12. The optical imaging lens system according to claim 1 or 2, wherein the tenth lens is a meniscus lens, the optical power is negative, the refractive index is greater than 1.95 and less than 2.05, and the abbe number is greater than 25 and less than 30.
13. The optical imaging lens system of claim 1 or 2, wherein the optical imaging lens system employs a fixed aperture.
14. The optical imaging lens system according to claim 1 or 2,
the fourth lens and the fifth lens and the sixth lens are respectively connected in a gluing mode; and/or the presence of a gas in the gas,
the seventh lens and the eighth lens are connected in a gluing mode; and/or the presence of a gas in the gas,
and the ninth lens and the tenth lens are connected in a gluing mode.
15. The optical imaging lens system according to claim 1 or 2, wherein the optical imaging lens system has an image plane size of 60mm, a focal length of 60mm, an aperture of F5.6, a working distance of 0.3m-inf, and a magnification of 0 to 0.2 x.
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|---|---|---|---|---|
| JPH09101451A (en) * | 1995-10-06 | 1997-04-15 | Tech Res & Dev Inst Of Japan Def Agency | Ultraviolet wide-angle lens |
| JPH09292571A (en) * | 1996-04-26 | 1997-11-11 | Nikon Corp | Objective lens for microscope |
| CN105629443A (en) * | 2016-03-30 | 2016-06-01 | 浙江大华技术股份有限公司 | Lens system and camera lens |
| CN207833090U (en) * | 2017-12-27 | 2018-09-07 | 东莞市宇瞳光学科技股份有限公司 | A kind of wide-angle machine visual lens |
| CN111929860A (en) * | 2020-08-03 | 2020-11-13 | 凤凰光学股份有限公司 | Large-target-surface high-definition fisheye lens |
| CN212364702U (en) * | 2020-09-21 | 2021-01-15 | 舜宇光学(中山)有限公司 | Wide-angle lens with large image surface |
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2021
- 2021-12-02 CN CN202111454296.0A patent/CN113866960B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09101451A (en) * | 1995-10-06 | 1997-04-15 | Tech Res & Dev Inst Of Japan Def Agency | Ultraviolet wide-angle lens |
| JPH09292571A (en) * | 1996-04-26 | 1997-11-11 | Nikon Corp | Objective lens for microscope |
| CN105629443A (en) * | 2016-03-30 | 2016-06-01 | 浙江大华技术股份有限公司 | Lens system and camera lens |
| CN207833090U (en) * | 2017-12-27 | 2018-09-07 | 东莞市宇瞳光学科技股份有限公司 | A kind of wide-angle machine visual lens |
| CN111929860A (en) * | 2020-08-03 | 2020-11-13 | 凤凰光学股份有限公司 | Large-target-surface high-definition fisheye lens |
| CN212364702U (en) * | 2020-09-21 | 2021-01-15 | 舜宇光学(中山)有限公司 | Wide-angle lens with large image surface |
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