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Imaging lens

An imaging lens and lens technology, applied in the field of imaging lens, can solve problems such as insufficient color and contrast, small range of working object distance, uneven picture definition, etc., to achieve small distortion, reduce burden ratio, and reduce tolerance sensitivity degree of effect

Pending Publication Date: 2021-01-26
舜宇光学(中山)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current machine vision lenses on the market have a small optical magnification, a small imaging frame, large distortion, uneven picture definition, and a small range of working object distance. Although such machine vision lenses have a wide shooting range , but its imaging is not delicate enough, the dynamic range is not high when imaging, and the color and contrast are not good enough
[0004] As machine vision is used more and more widely, the requirements for machine vision imaging systems are getting higher and higher. The current machine vision lenses on the market are increasingly unable to meet the needs of the market, especially in some high-end cameras that require high imaging quality. Precision high-tech fields are severely limited

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0073] figure 1 is a schematic diagram showing the structure of the imaging lens according to Embodiment 1 of the present invention.

[0074] In Embodiment 1, the total length of the optical system is TTL=42.9mm, the focal length of the system is f=25.1mm, the imaging object distance range of the system is 0.15m~inf, the frame size of the system is Y=12mm, and the F-number FNO=3.1.

[0075] The following table 2 lists the relevant parameters of each lens of the present embodiment, including surface type, radius of curvature, thickness, refractive index of material, Abbe number:

[0076] Face number surface type R value thickness Refractive index Abbe number sur1 standard 20.54 2.35 1.85 52.35 sur2 standard 52.41 0.5 sur3 standard 8.45 2.95 1.6 68.0 sur4 standard 25.71 1.2 1.58 46.17 sur5 standard 6.88 5.57 stop standard infinity 3.15 Sur7 standard -8.84 0.8 1.68 33.85 S...

Embodiment approach 2

[0081] Figure 6 is a schematic diagram showing the structure of the imaging lens according to Embodiment 2 of the present invention.

[0082] In Embodiment 2, the total length of the optical system is TTL=43.5mm, the focal length of the system is f=26.4mm, the imaging object distance range of the system is 0.15m-inf, the frame size of the system is Y=12.5mm, and the F-number FNO=2.5.

[0083] The following table 3 lists the relevant parameters of each lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of material, Abbe number:

[0084] Face number surface type R value thickness Refractive index Abbe number sur1 standard 22.5 2.45 1.78 60.23 sur2 standard 64.2 0.15 sur3 standard 10.73 3.56 1.55 75.0 sur4 standard -54.07 2.0 1.58 49.2 sur5 standard 8.83 2.38 stop standard infinity 4.80 Sur7 standard -10.24 1.2 1.65 33.84 Sur...

Embodiment approach 3

[0089] Figure 11 is a schematic diagram showing the structure of the imaging lens according to Embodiment 3 of the present invention.

[0090] In Embodiment 3, the total length of the optical system is TTL=53.00mm, the focal length of the system is f=33.5mm, the imaging object distance range of the system is 0.15m~inf, the frame size of the system is Y=11.5mm, and the F-number FNO=2.6.

[0091] The following table 4 lists the relevant parameters of each lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of material, Abbe number:

[0092] Face number surface type R value thickness Refractive index Abbe number sur1 standard 35.02 4.2 1.85 37.5 sur2 standard 165.14 0.2 sur3 standard 18.2 4.1 1.50 80.2 sur4 standard infinity 3.85 1.70 35.15 sur5 standard 13.5 4.89 stop standard infinity 4.5 Sur7 standard -15.75 2.54 1.62 36.35 ...

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Abstract

The invention relates to an imaging lens which comprises a first lens group (G1) with positive focal power, a diaphragm, a second lens group (G2) with positive focal power and a third lens group (G3)with positive focal power or negative focal power which are sequentially arranged from an object side to an image side, and the third lens group (G3) is a fixed group. The first lens group (G1) and the second lens group (G2) form a focusing group capable of moving along an optical axis. The imaging lens is arranged according to the limitations, and can realize the characteristics of large aperture, high resolution, low distortion, uniform image quality, large depth of field, good color rendition degree and high contrast ratio.

Description

technical field [0001] The invention relates to the field of optical devices, in particular to an imaging lens. Background technique [0002] Machine vision refers to the use of machines instead of human eyes for measurement and judgment, converting the captured target into an image signal, and sending it to a dedicated image processing system to obtain the shape information of the captured target. According to the pixel distribution and brightness, color and other information, Transformed into digital signals; the image system performs various operations on these signals to extract the characteristics of the target, such as position, size, appearance, etc., and then outputs the results according to preset conditions to realize functions such as automatic identification, judgment, and measurement. [0003] Therefore, the imaging system used for machine vision has very high requirements on pixels, picture uniformity, distortion, brightness, and color reproduction. However, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/14
CPCG02B15/143103
Inventor 周静胡可欣刘保东
Owner 舜宇光学(中山)有限公司
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