CN214474189U - High-precision large-visual-angle aspheric relay lens - Google Patents
High-precision large-visual-angle aspheric relay lens Download PDFInfo
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- CN214474189U CN214474189U CN202120049771.5U CN202120049771U CN214474189U CN 214474189 U CN214474189 U CN 214474189U CN 202120049771 U CN202120049771 U CN 202120049771U CN 214474189 U CN214474189 U CN 214474189U
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- 230000003287 optical effect Effects 0.000 claims abstract description 19
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- 230000000007 visual effect Effects 0.000 claims description 7
- 238000003384 imaging method Methods 0.000 abstract description 17
- 238000005452 bending Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
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Abstract
The utility model relates to the technical field of imaging quality detection, in particular to a high-precision large-visual-angle aspheric relay lens, which comprises a first lens with a negative focal length, a second lens with a positive focal length and a third lens with a positive focal length along an optical axis in sequence; the image surface side of the first lens is a convex surface of a standard spherical structure, and the object surface side of the first lens is a concave surface of the standard spherical structure; the image surface side of the second lens is a convex surface of a standard spherical structure, and the object surface side of the second lens is a concave surface of the standard spherical structure; the image surface side of the third lens is a convex surface with an even-order aspheric surface structure, and the object surface side of the third lens is a concave surface with an even-order aspheric surface structure. The relay lens is simple in structure and small in lens number, the design of the relay lens with a larger view field can be realized, the imaging resolution of a lens is improved, and meanwhile, the chromatic dispersion and the field bending can be effectively controlled. In addition, the optical system realizes more excellent optical performance, and overcomes the structural limitation and the optical performance requirement which cannot be achieved by a spherical lens.
Description
Technical Field
The utility model relates to an imaging quality detects technical field, in particular to big visual angle aspheric surface relay lens of high accuracy.
Background
With the rapid development of camera lens and chip technology, high-pixel chips and cameras have replaced low-pixel cameras, high-pixel camera modules also need to detect the imaging quality at a long distance, generally high-pixel cameras need to detect the picture quality at 3m and more, and a conventional detection method needs to occupy a relatively large space, such as a camera module with a large visual angle of 130 degrees, when the imaging device shoots an object with a distance of 5000mm, the imaging size is 2 × 5000 tan (130/2) ═ 21445mm, when the camera module is produced, the imaging quality of the camera module is difficult to detect, and the relay lens is used for solving the problem, and the images under different testing 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 testing 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.
The installation distance of the existing 130-degree relay lens is 18mm, although the diameter size of the lens body is controlled to be a certain size, the focal length of the lens is too large, so that the imaging size is about 1200mm, and the existing 130-degree relay lens cannot meet the requirement.
Disclosure of Invention
To the above situation, the utility model provides a big visual angle aspheric surface relay lens 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 large-visual-angle aspheric relay lens sequentially comprises a first lens with a negative focal length, a second lens with a positive focal length and a third lens with a positive focal length along an optical axis; wherein,
the image surface side of the first lens is a convex surface of a standard spherical structure, and the object surface side of the first lens is a concave surface of the standard spherical structure;
the image surface side of the second lens is a convex surface of a standard spherical structure, and the object surface side of the second lens is a concave surface of the standard spherical structure;
the image surface side of the third lens is a convex surface with an even-order aspheric surface structure, and the object surface side of the third lens is a concave surface with an even-order aspheric surface structure.
Further, the optical system also satisfies the following condition:
(1)Nd1＝1.7408；Vd1＝27.762；
(2)Nd2＝1.8028；Vd2＝46.774；
(3)Nd3＝1.8830；Vd3＝40.868；
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 abbe number of the third lens.
Furthermore, the focal length f1 of the first lens is-181.3 mm-201.3 mm.
Further, the focal length f2 of the second lens is 244.6 mm-224.6 mm.
Further, the focal length f3 of the third lens is 244.3 mm-224.3 mm.
Furthermore, the curvature radius of the image surface side of the first lens is-245.139, and the curvature radius of the object surface side of the first lens is-88.252.
Furthermore, the curvature radius of the image surface side of the first lens is-122.075, and the curvature radius of the object surface side of the first lens is-315.177.
Furthermore, the curvature radius of the image surface side of the first lens is-121.691, and the curvature radius of the object surface side of the first lens is-274.118.
Compared with the prior art, the utility model discloses following technological effect has:
the high-precision large-visual-angle aspheric relay lens is simple in structure and small in lens number, and can realize the design of the relay lens with a larger visual field, improve the imaging resolution of a lens and effectively control chromatic dispersion and field bending. In addition, the third lens in the optical system adopts an even-order aspheric lens, so that more excellent optical performance is realized, the structural limitation and the optical performance requirement which cannot be met by a spherical lens are overcome, and the processing cost of the even-order aspheric lens is lower.
Drawings
Fig. 1 is a schematic structural diagram of a high-precision large-viewing-angle aspheric relay lens of the present invention;
fig. 2 is a light path diagram of the high-precision large-viewing-angle aspheric relay lens of the present invention;
fig. 3 is a MTF graph of the high-precision large-viewing-angle aspheric relay lens of the present invention;
fig. 4 is a dot array diagram of the high-precision large-viewing-angle aspheric relay lens of the present invention;
fig. 5 is a distortion curve diagram of the high-precision large-viewing angle aspheric relay lens of the present invention.
Reference numbers in the figures: 1. a first lens; 2. a second lens; 3. a third lens; 4. a camera module; 5. an imaging position; 6. simulating a position; 7. 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 big visual angle aspheric surface relay lens 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 large-viewing-angle aspheric relay lens sequentially comprises a first lens 1 with a negative focal length, a second lens 2 with a positive focal length, and a third lens 3 with a positive focal length along an optical axis 7; wherein, the image surface side of the first lens 1 is a convex surface of a standard spherical structure, and the object surface side is a concave surface of the standard spherical structure; the image surface side of the second lens 2 is a convex surface of a standard spherical structure, and the object surface side is a concave surface of the standard spherical structure; the image surface side of the third lens 3 is a convex surface with an even-order aspheric surface structure, and the object surface side is a concave surface with an even-order aspheric surface structure. 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 6 to the distance of camera module 4 of the shooting distance of camera module 4 reality), 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＝1.7408；Vd1＝27.762；
(2)Nd2＝1.8028；Vd2＝46.774；
(3)Nd3＝1.8830；Vd3＝40.868；
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.
Further, the focal length f1 of the first lens 1 is-181.3 mm to-201.3 mm, and preferably, f1 is-191.3 mm, which is beneficial to forming a clear image by an optical system or a lens.
Further, the focal length f2 of the second lens 2 is 244.6mm to 224.6mm, and preferably, f2 is 234.6mm, which is beneficial for the optical system or the lens to form a clear image.
Further, the focal length f3 of the third lens 3 is 244.3 mm-224.3 mm, and preferably f3 is 234.3mm, which is beneficial for the optical system or the lens to form a clear image.
Further, the curvature radius of the image surface side of the first lens 1 is-245.139, and the curvature radius of the object surface side is-88.252.
Further, the curvature radius of the image surface side of the first lens 1 is-122.075, and the curvature radius of the object surface side is-315.177.
Further, the curvature radius of the image surface side of the first lens 1 is-121.691, and the curvature radius of the object surface side is-274.118.
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 to the entrance pupil side or the camera module side along the optical axis, S1, S2 are both surfaces of the first lens 1; s3, S4 are both surfaces of the second lens 2; s5 and S6 show two surfaces of the third lens 3.
Wherein, the even aspheric model formula:
z represents the height of the curved surface; y represents the distance from a point of the surface to the center.
The parameters in the face S5 in the third lens are as follows: c is 1/R; k is 2.64236; a1 ═ -1.877393407004480E-007; a2 ═ 1.493608837061364E-011; a3 ═ 5.075013867029771E-014; a4 ═ -2.073031513815784E-017; a5 is 3.139545363732157E-021.
The parameters in the face S6 in the third lens are as follows: c is 1/R; k is 16.50758; a1 ═ -7.882621887561648E-007; a2 ═ 6.571958887696538E-010; a3 ═ -2.972208399820230E-013; a4 ═ 7.595810828057578E-017; a5 is-8.023073572611296E-021.
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 lens visual angle is large, namely the FOV is 130 degrees; 2. the installation distance of the lens is 20mm, so that the installation of a focusing mechanism is convenient, and the diameter of the lens is less than or equal to 180 mm; 3. the imaging distance can simulate 5000 mm-infinity; 4. when the simulated imaging distance is infinite, the imaging size does not exceed 750 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 (8)
1. A high-precision large-visual-angle aspheric relay lens is characterized by sequentially comprising a first lens with a negative focal length, a second lens with a positive focal length and a third lens with a positive focal length along an optical axis; wherein,
the image surface side of the first lens is a convex surface of a standard spherical structure, and the object surface side of the first lens is a concave surface of the standard spherical structure;
the image surface side of the second lens is a convex surface of a standard spherical structure, and the object surface side of the second lens is a concave surface of the standard spherical structure;
the image surface side of the third lens is a convex surface with an even-order aspheric surface structure, and the object surface side of the third lens is a concave surface with an even-order aspheric surface structure.
2. The aspheric relay lens with high precision and large visual angle as claimed in claim 1, wherein: the lens also satisfies the following conditions:
(1)Nd1＝1.7408；Vd1＝27.762；
(2)Nd2＝1.8028；Vd2＝46.774；
(3)Nd3＝1.8830；Vd3＝40.868；
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 abbe number of the third lens.
3. A high-precision large-viewing-angle aspheric relay lens as claimed in claim 1 or 2, characterized in that: the focal length f1 of the first lens is-181.3 mm-201.3 mm.
4. A high-precision large-viewing-angle aspheric relay lens as claimed in claim 1 or 2, characterized in that: the focal length f2 of the second lens is 244.6 mm-224.6 mm.
5. A high-precision large-viewing-angle aspheric relay lens as claimed in claim 1 or 2, characterized in that: the focal length f3 of the third lens is 244.3 mm-224.3 mm.
6. A high-precision large-viewing-angle aspheric relay lens as claimed in claim 1 or 2, characterized in that: the curvature radius of the image surface side of the first lens is-245.139, and the curvature radius of the object surface side of the first lens is-88.252.
7. A high-precision large-viewing-angle aspheric relay lens as claimed in claim 1 or 2, characterized in that: the curvature radius of the image surface side of the first lens is-122.075, and the curvature radius of the object surface side of the first lens is-315.177.
8. A high-precision large-viewing-angle aspheric relay lens as claimed in claim 1 or 2, characterized in that: the curvature radius of the image surface side of the first lens is-121.691, and the curvature radius of the object surface side of the first lens is-274.118.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120049771.5U CN214474189U (en) | 2021-01-09 | 2021-01-09 | High-precision large-visual-angle aspheric relay lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120049771.5U CN214474189U (en) | 2021-01-09 | 2021-01-09 | High-precision large-visual-angle aspheric relay lens |
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| Publication Number | Publication Date |
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| CN214474189U true CN214474189U (en) | 2021-10-22 |
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| CN202120049771.5U Active CN214474189U (en) | 2021-01-09 | 2021-01-09 | High-precision large-visual-angle aspheric relay lens |
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- 2021-01-09 CN CN202120049771.5U patent/CN214474189U/en active Active
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