CN214474188U - High-precision small relay lens with large entrance pupil diameter - Google Patents
High-precision small relay lens with large entrance pupil diameter Download PDFInfo
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- CN214474188U CN214474188U CN202120049715.1U CN202120049715U CN214474188U CN 214474188 U CN214474188 U CN 214474188U CN 202120049715 U CN202120049715 U CN 202120049715U CN 214474188 U CN214474188 U CN 214474188U
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- 210000001747 pupil Anatomy 0.000 title claims abstract description 24
- 230000003287 optical effect Effects 0.000 claims abstract description 19
- 239000006185 dispersion Substances 0.000 claims description 9
- 238000003384 imaging method Methods 0.000 abstract description 11
- 238000009434 installation Methods 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000012634 optical imaging Methods 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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Abstract
The utility model relates to the technical field of optical imaging quality detection, in particular to a high-precision small relay lens with large entrance pupil diameter, which sequentially comprises a first lens with positive focal length, a second lens with positive focal length, a third lens with positive focal length and a fourth lens with positive focal length along an optical axis; wherein, the image surface side of the first lens is a concave surface, and the object surface side is a concave surface; the image surface side of the second lens is a convex surface, and the object surface side of the second lens is a concave surface; the image surface side of the third lens is a concave surface, and the object surface side of the third lens is a concave surface; the image surface side of the fourth lens is a convex surface, and the object surface side is a plane. The relay lens is simple in structure, the number of the lenses is small, cost can be well reduced, image distances of different positions can be simulated by adjusting object distances and changing the image distances, so that a tested lens can realize shooting tests of different focal lengths through the optical system, characteristics of each lens can be utilized, the relay lens is small in installation distance with a camera module, the diameter of the lens of the relay lens is small, the diameter of an entrance pupil is large, and imaging is excellent.
Description
Technical Field
The utility model relates to an optical imaging quality detects technical field, in particular to relay lens of the small-size pupil diameter of entering of high accuracy.
Background
With the rapid development of camera lenses and chip technologies, a high-pixel chip and a camera replace a low-pixel camera, the high-pixel camera module also needs to detect the long-distance imaging quality, generally, the high-pixel camera needs to detect the picture quality of 3m and more, a conventional detection method needs to occupy a larger space, and a relay lens is used for solving the problem, the pictures in different required test distance states can be shot by using a relatively short simulation distance to evaluate the imaging quality of the high-pixel camera, so that the test space range is effectively reduced; however, the conventional relay lens has a problem that the larger the angle of view of the camera module, the larger the distance between the camera module and the relay lens, and the larger the diameter of the lens body, so that the manufacturing limit is exceeded.
Disclosure of Invention
To the above situation, the utility model provides a relay lens of the small-size big entrance pupil diameter of high accuracy to overcome prior art's defect.
The utility model provides a technical scheme that problem among the prior art adopted does: a high-precision small relay lens with a large entrance pupil diameter sequentially comprises a first lens with a positive focal length, a second lens with a positive focal length, a third lens with a positive focal length and a fourth lens with a positive focal length along an optical axis; wherein,
the image surface side of the first lens is a concave surface, and the object surface side of the first lens is a concave surface;
the image surface side of the second lens is a convex surface, and the object surface side of the second lens is a concave surface;
the image surface side of the third lens is a concave surface, and the object surface side of the third lens is a concave surface;
the image surface side of the fourth lens is a convex surface, and the object surface side is a plane.
Further, the optical system also satisfies the following condition:
(1)1.5＜Nd1＜1.7；55＜Vd1＜70；
(2)1.6＜Nd2＜1.8；55＜Vd2＜70；
(3)1.5＜Nd3＜1.7；45＜Vd3＜60；
(4)1.5＜Nd4＜1.7；30＜Vd5＜45；
wherein Nd1 is the refractive index of the first lens, and Vd1 is the dispersion coefficient of the first lens; nd2 is the refractive index of the second lens, and Vd2 is the dispersion coefficient of the second lens; nd3 is the refractive index of the third lens, and Vd3 is the dispersion coefficient of the third lens; nd4 is the refractive index of the fourth lens, and Vd4 is the abbe number of the fourth lens.
Further, the focal length f1 of the first lens is 75-85 mm.
Further, the focal length f2 of the second lens is 50 mm-60 mm.
Further, the focal length f3 of the third lens is 60 mm-70 mm.
Further, the focal length f4 of the fourth lens is 120 mm-130 mm.
Compared with the prior art, the utility model discloses following technological effect has:
this scheme is a small-size relay lens of big entrance pupil diameter of high accuracy, the simple structure of this relay lens, and the lens is small in quantity, and reduce cost well thereby changes the image distance through adjusting the object distance, simulates out the image distance of different positions to the camera lens that makes the test realizes the shooting test of different focuses through this application optical system. This optical system utilizes the characteristics of each lens self through carrying out reasonable collocation with first lens, second lens, third lens and fourth lens for relay lens and camera module installation distance are little, and the camera lens diameter of relay lens is little, and the entrance pupil diameter is big, and the formation of image is excellent.
Drawings
Fig. 1 is a schematic structural view of a high-precision small relay lens with a large entrance pupil diameter according to the present invention;
fig. 2 is an optical path diagram of a high-precision small relay lens with a large entrance pupil diameter according to the present invention;
fig. 3 is a MTF graph of a high-precision small relay lens with a large entrance pupil diameter according to the present invention;
figure 4 is a point diagram of a high precision small relay lens with a large entrance pupil diameter according to the present invention;
fig. 5 is a distortion curve diagram of a high-precision small relay lens with a large entrance pupil diameter.
Reference numbers in the figures: 1. a first lens; 2. a second lens; 3. a third lens; 4. a fourth lens; 5. a camera module; 6. an imaging position; 7. simulating a position; 8. an optical axis.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the structures or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be considered limiting of the present application.
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 one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
The application provides a relay lens of the small-size big entrance pupil diameter of high accuracy, and this relay lens is used for evaluating the formation of image quality of camera, the effectual test space scope that has reduced.
Referring to fig. 1, the high-precision small relay lens with a large entrance pupil diameter includes, in order along an optical axis 8, a first lens 1 with a positive focal length, a second lens 2 with a positive focal length, a third lens 3 with a positive focal length, and a fourth lens 4 with a positive focal length; wherein, the image surface side of the first lens 1 is a concave surface, and the object surface side is a concave surface; the image surface side of the second lens 2 is a convex surface, and the object surface side is a concave surface; the image surface side of the third lens 3 is a concave surface, and the object surface side is a concave surface; the image surface side of the fourth lens 4 is a convex surface, and the object surface side is a plane. This application is through the optical virtual image principle of simulation measured lens in order to reach the different analog distance that different virtual image positions of simulation correspond (the analog position 7 of the shooting distance of camera module 5 reality to the distance of camera module 5), improves optical system's resolution performance to reach the resolution ratio of high pixel.
Further, the optical system also satisfies the following condition:
(1) nd1 is more than 1.5 and less than 1.7; 55 < Vd1 < 70, preferably Nd1 is 1.6 and Vd1 is 60;
(2) nd2 is more than 1.6 and less than 1.8; 55 < Vd2 < 70, preferably Nd2 is 1.7 and Vd2 is 60;
(3) nd3 is more than 1.5 and less than 1.7; 45 < Vd3 < 60, preferably Nd3 is 1.6 and Vd3 is 50;
(4) nd4 is more than 1.5 and less than 1.7; 30 < Vd5 < 45, preferably Nd4 is 1.6 and Vd4 is 38;
wherein Nd1 is the refractive index of the first lens 1, and Vd1 is the abbe number of the first lens 1; nd2 is the refractive index of the second lens 2, and Vd2 is the abbe number of the second lens 2; nd3 is the refractive index of the third lens 3, and Vd3 is the abbe number of the third lens 3; nd4 is the refractive index of the fourth lens 4, and Vd4 is the abbe number of the fourth lens 4. The lens dispersion coefficients of different refractive index materials are different, the higher the refractive index is, the lower the dispersion coefficient is, after reasonable collocation is carried out by utilizing the different properties of each lens, the dispersion range of light rays to the image surface is smaller, so that the imaging of an optical system or a lens is clearer, and the quality is higher.
Further, the focal length f1 of the first lens 1 is 75 mm-85 mm, and preferably f1 is 80mm, which is beneficial for the optical system or the lens to form a clear image.
Further, the focal length f2 of the second lens 2 is 50mm to 60mm, and preferably, f2 is 55mm, which is beneficial to enable the optical system or the lens to form a clear image.
Further, the focal length f3 of the third lens 3 is 60mm to 70mm, and preferably, f3 is 65mm, which is beneficial to enable the optical system or the lens to form a clear image.
Further, the focal length f4 of the fourth lens 4 is 120mm to 130mm, and preferably, f4 is 125mm, which is beneficial to enable the optical system or the lens to form a clear image.
Further, in the present embodiment, the basic parameters of the relay lens are shown in the following table:
in the above table, from the imaging position 6 to the entrance pupil side or the camera module 5 side along the optical axis 8, S1, S2 are both surfaces of the first lens 1; s3, S4 are both surfaces of the second lens 2; s5, S6 are both surfaces of the third lens 3; s7 and S8 indicate two surfaces of the fourth lens 4.
As can be seen from the MTF graph of fig. 3 and the dot sequence chart of fig. 4, the relay lens of the present invention has high resolution and is clear in the imaging range of the image plane.
It can be seen from the distortion graph of fig. 5 that the imaging distortion of the relay lens of the present application is small.
According to the structure and the parameters of each lens, the relay lens has the following characteristics: 1. the entrance pupil diameter is large, and the maximum diameter is 18 mm; 2. the lens visual angle is large, namely the FOV is 45 degrees; 3. the installation distance of the lens is small, namely the installation distance is 10mm, and the diameter of the lens is reduced, so that the diameter of the lens is less than or equal to 30 mm; 4. the lens is small, so that a plurality of groups of lenses can be arranged in an array mode in a detection machine or a test station to measure different camera modules 5, and the test efficiency is improved; 5. the imaging distance can simulate 400 mm-infinity; 6. when the simulated imaging distance is infinite, the imaging size does not exceed 300 mm.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A high-precision small relay lens with a large entrance pupil diameter is characterized by sequentially comprising a first lens with a positive focal length, a second lens with a positive focal length, a third lens with a positive focal length and a fourth lens with a positive focal length along an optical axis; wherein,
the image surface side of the first lens is a concave surface, and the object surface side of the first lens is a concave surface;
the image surface side of the second lens is a convex surface, and the object surface side of the second lens is a concave surface;
the image surface side of the third lens is a concave surface, and the object surface side of the third lens is a concave surface;
the image surface side of the fourth lens is a convex surface, and the object surface side is a plane.
2. A high precision, compact, large entrance pupil diameter relay lens according to claim 1, wherein: the lens also satisfies the following conditions:
(1)1.5＜Nd1＜1.7；55＜Vd1＜70；
(2)1.6＜Nd2＜1.8；55＜Vd2＜70；
(3)1.5＜Nd3＜1.7；45＜Vd3＜60；
(4)1.5＜Nd4＜1.7；30＜Vd5＜45；
wherein Nd1 is the refractive index of the first lens, and Vd1 is the dispersion coefficient of the first lens; nd2 is the refractive index of the second lens, and Vd2 is the dispersion coefficient of the second lens; nd3 is the refractive index of the third lens, and Vd3 is the dispersion coefficient of the third lens; nd4 is the refractive index of the fourth lens, and Vd4 is the abbe number of the fourth lens.
3. A high precision, compact, large entrance pupil diameter relay lens according to claim 1 or 2, characterized in that: the focal length f1 of the first lens is 75-85 mm.
4. A high precision, compact, large entrance pupil diameter relay lens according to claim 1 or 2, characterized in that: the focal length f2 of the second lens is 50-60 mm.
5. A high precision, compact, large entrance pupil diameter relay lens according to claim 1 or 2, characterized in that: the focal length f3 of the third lens is 60-70 mm.
6. A high precision, compact, large entrance pupil diameter relay lens according to claim 1 or 2, characterized in that: the focal length f4 of the fourth lens is 120-130 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120049715.1U CN214474188U (en) | 2021-01-09 | 2021-01-09 | High-precision small relay lens with large entrance pupil diameter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120049715.1U CN214474188U (en) | 2021-01-09 | 2021-01-09 | High-precision small relay lens with large entrance pupil diameter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214474188U true CN214474188U (en) | 2021-10-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120049715.1U Active CN214474188U (en) | 2021-01-09 | 2021-01-09 | High-precision small relay lens with large entrance pupil diameter |
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| CN (1) | CN214474188U (en) |
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2021
- 2021-01-09 CN CN202120049715.1U patent/CN214474188U/en active Active
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