CN220872755U

CN220872755U - 25Mm focal length 1/2' target surface visible light imaging lens

Info

Publication number: CN220872755U
Application number: CN202322794232.6U
Authority: CN
Inventors: 蒋霖坤; 陈敏; 陈鑫; 张悦
Original assignee: Suzhou Lingxi Precision Instrument Co ltd
Current assignee: Suzhou Lingxi Precision Instrument Co ltd
Priority date: 2023-10-18
Filing date: 2023-10-18
Publication date: 2024-04-30
Anticipated expiration: 2033-10-18

Abstract

The utility model provides a 25mm focal length 1/2' target surface visible light imaging lens, which consists of a first lens L1, a second lens L2 and a third lens L3. The design wavelength of the lens is 400 nm-700 nm, and the lens is suitable for the object distance of 0.1 m-infinity. -RMS at focus less than 1.6 μm in the range of 9.2 ° to 9.2 ° field angle, adapting to CCD/CMOS of 2.2 μm pel size. The lens is composed of three lenses and five spherical surfaces, and has a simple structure.

Description

25Mm focal length 1/2' target surface visible light imaging lens

Technical Field

The utility model relates to optics, in particular to a 25mm focal length 1/2' target surface visible light imaging lens.

Background

A visible light imaging lens is an optical device for capturing an image in the visible light range. It is one of the core components of camera, telescope, microscope, etc. The performance evaluation indexes of the visible light imaging lens comprise resolution, distortion, chromatic aberration, light transmittance and the like. The high resolution ensures that the definition of the image, distortion and chromatic aberration influence the accuracy of the image, and the light transmittance determines the light capturing efficiency. As technology advances, lens manufacturers continue to explore new lens designs and materials to achieve better imaging results. The visible light imaging lens plays an important role in modern life, is widely applied to the fields of photography, scientific research, medical imaging and the like, and continuously promotes the development of optical technology.

Disclosure of utility model

The technical scheme of the utility model is as follows: 25mm focal length 1/2' target surface visible light imaging lens.

The lens parameters of the utility model include:

The curvature radius of the front surface S1 of the first lens L1 is 10 mm-15 mm; the rear surface S2 of the first lens L1 is a plane; the curvature radius of the front surface S3 of the second lens L2 is-25 mm to-10 mm; the curvature radius of the rear surface S4 of the second lens L2 is 5 mm-15 mm; the curvature radius of the front surface S5 of the third lens L3 is 20 mm-80 mm; the radius of curvature of the rear surface S6 of the third lens L3 ranges from-20 mm to-10 mm. The thickness of the first lens L1 is 3 mm-8 mm, and the diameter is 7 mm-10 mm; the rear surface S2 of the first lens L1 is 1 mm-5 mm away from the front surface S3 of the second lens L2; the thickness of the second lens L2 is 0.5 mm-2 mm, and the diameter is 4 mm-6 mm; the rear surface S4 of the second lens L2 is 4 mm-8 mm away from the front surface S5 of the third lens L3; the thickness of the third lens L3 is 0.5 mm-3 mm, and the diameter is 6 mm-8 mm; the rear surface S6 of the third lens L3 is spaced from the target surface S7 by 15mm to 25mm.

The front surface S3 of the second lens L2 is a lens diaphragm, and the diameter of the diaphragm is 2 mm-3 mm.

The IndexNd range of the first lens L1 is 1.7-1.9, and the AbbeVd range is 35-55; the IndexNd range of the second lens L2 is 1.7-1.9, and the AbbeVd range is 20-30; the third lens L3 has a IndexNd range of 1.7 to 1.9 and an AbbeVd range of 35 to 55.

The design wavelength of the lens is 400 nm-700 nm.

The focal length of the lens is 25mm, and the applicable object distance is 0.1m to infinity.

Lens angle of view (d×h×v): 18.4 x 14.8 x 11.

The lens is adapted to a 1/2' target surface, i.e. 6.4mm by 4.8mm, with a diagonal length of 8mm.

The utility model has the beneficial effects that:

1. The target surface visible light imaging lens with the focal length of 25mm and 1/2' is provided, the design wavelength is 400 nm-700 nm, and the applicable object distance is 0.1 m-infinity;

2. -RMS at focus less than 1.6 μm in the range of 9.2 ° to 9.2 ° field angle, adapting to CCD/CMOS of 2.2 μm pel size;

3. The lens is composed of three lenses and five spherical surfaces, and has a simple structure.

Drawings

Fig. 1 is a schematic view of the optical path structure of the present utility model.

Fig. 2 is a schematic view of an optical path according to a first embodiment of the present utility model.

FIG. 3 is a schematic diagram of an optical system image point according to a first embodiment of the present utility model.

Fig. 4 is a graph showing the modulation transfer function according to the first embodiment of the present utility model.

Detailed Description

The utility model will be further described with reference to the accompanying drawings and examples of implementation.

An embodiment of the present utility model is shown in fig. 1: the lens is composed of a first lens L1, a second lens L2, and a third lens L3. The curvature radius of the front surface S1 of the first lens L1 is 10 mm-15 mm; the rear surface S2 of the first lens L1 is a plane; the curvature radius of the front surface S3 of the second lens L2 is-25 mm to-10 mm; the curvature radius of the rear surface S4 of the second lens L2 is 5 mm-15 mm; the curvature radius of the front surface S5 of the third lens L3 is 20 mm-80 mm; the radius of curvature of the rear surface S6 of the third lens L3 ranges from-20 mm to-10 mm. The thickness of the first lens L1 is 3 mm-8 mm, and the diameter is 7 mm-10 mm; the rear surface S2 of the first lens L1 is 1 mm-5 mm away from the front surface S3 of the second lens L2; the thickness of the second lens L2 is 0.5 mm-2 mm, and the diameter is 4 mm-6 mm; the rear surface S4 of the second lens L2 is 4 mm-8 mm away from the front surface S5 of the third lens L3; the thickness of the third lens L3 is 0.5 mm-3 mm, and the diameter is 6 mm-8 mm; the rear surface S6 of the third lens L3 is spaced from the target surface S7 by 15mm to 25mm.

The IndexNd range of the first lens L1 is 1.7-1.9, and the Abbe Vd range is 35-55; the IndexNd range of the second lens L2 is 1.7-1.9, and the Abbe Vd range is 20-30; the third lens L3 has IndexNd ranges from 1.7 to 1.9 and Abbe Vd ranges from 35 to 55.

The design wavelength of the lens is 400 nm-700 nm.

Lens angle of view (d×h×v): 18.4 x 14.8 x 11.

In one embodiment, the optical path is shown in fig. 2, and the lens specific parameters are shown in table 1. The image quality point column diagram of the optical system with three wavelengths of 486nm, 587nm and 656nm corresponding to 0 °,3 °, 5.5 °, 7.4 ° and 9.2 ° on the target surface S7 is shown in fig. 3, and the modulation transfer function is shown in fig. 4. As shown in FIG. 3, the RMS at the focus is less than 1.6 μm in the range of 0-9.2, adapting to CCD/CMOS of 2.2 μm pixel size.

In the present embodiment, the main optical indexes are as follows:

1. Lens focal length f=25 mm;

2. The size of the target surface is 6.4mm multiplied by 4.8mm;

3. Designing a wave band: 400 nm-700 nm;

4. Lens angle of view (d×h×v): 18.4 x 14.8 x 11.

TABLE 1

The present utility model is not limited to the above-mentioned embodiments, but is not limited to the above-mentioned embodiments, and any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical matters of the present utility model can be made by those skilled in the art without departing from the scope of the present utility model.

Claims

1.25Mm focal length 1/2' target surface visible light imaging lens, its characterized in that: the lens is composed of a first lens (L1), a second lens (L2) and a third lens (L3); the radius of curvature of the front surface (S1) of the first lens (L1) is 10 mm-15 mm; the rear surface (S2) of the first lens (L1) is a plane; the radius of curvature of the front surface (S3) of the second lens (L2) ranges from-25 mm to-10 mm; the radius of curvature of the rear surface (S4) of the second lens (L2) is 5 mm-15 mm; the radius of curvature of the front surface (S5) of the third lens (L3) is 20 mm-80 mm; the radius of curvature of the rear surface (S6) of the third lens (L3) ranges from-20 mm to-10 mm; the thickness of the first lens (L1) is 3 mm-8 mm, and the diameter is 7 mm-10 mm; the rear surface (S2) of the first lens (L1) is 1 mm-5 mm away from the front surface (S3) of the second lens (L2); the thickness of the second lens (L2) is 0.5 mm-2 mm, and the diameter is 4 mm-6 mm; the rear surface (S4) of the second lens (L2) is 4-8 mm away from the front surface (S5) of the third lens (L3); the thickness of the third lens (L3) is 0.5 mm-3 mm, and the diameter is 6 mm-8 mm; the rear surface (S6) of the third lens (L3) is 15-25 mm away from the target surface (S7).

2. The 25mm focal length 1/2 "target surface visible light imaging lens of claim 1, wherein: the front surface (S3) of the second lens (L2) is a diaphragm, and the diameter of the diaphragm is 2 mm-3 mm.

3. The 25mm focal length 1/2 "target surface visible light imaging lens of claim 1, wherein: index Nd of the first lens (L1) ranges from 1.7 to 1.9, and Abbe Vd ranges from 35 to 55; the Index Nd range of the second lens (L2) is 1.7-1.9, and the Abbe Vd range is 20-30; the Index Nd range of the third lens (L3) is 1.7-1.9, and the Abbe Vd range is 35-55.

4. The 25mm focal length 1/2 "target surface visible light imaging lens of claim 1, wherein: the design wavelength of the lens is 400 nm-700 nm, the focal length is 25mm, the applicable object distance is 0.1 m-infinity, and the maximum angle of view is 18.4 degrees.