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Wide-angle low-distortion line scanning lens

A lens and wide-angle technology, applied in the field of optical lenses, can solve the problems of optical distortion, reduce the accuracy of measurement, increase production costs, etc., achieve high precision, wide application range, and ensure the effect of image quality

Pending Publication Date: 2022-03-01
XIAMEN LEADING OPTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing line-scan lenses generally have the situation that optical distortion, field of view, image plane and working distance cannot be taken into account at the same time, which often leads to a situation in production and application: when the angle meets the detection requirements, due to excessive optical distortion, As a result, the accuracy of measurement can only be reduced; when the optical distortion meets the requirements, the angle is often relatively small, and it needs to be completed by adding cameras and lenses, which increases production costs

Method used

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  • Wide-angle low-distortion line scanning lens
  • Wide-angle low-distortion line scanning lens
  • Wide-angle low-distortion line scanning lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] refer to figure 1 As shown, the present invention discloses a wide-angle low-distortion line-scan lens, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a diaphragm 16, The seventh lens 7, the eighth lens 8, the ninth lens 9, the tenth lens 10, the eleventh lens 11, the twelfth lens 12, the thirteenth lens 13, the fourteenth lens, and the fifteenth lens 15, the The first lens 1 to the fifteenth lens 15 each include an object side facing the object side and allowing the imaging light to pass through, and an image side facing the image side and allowing the imaging light to pass through;

[0086] The first lens 1 has a positive diopter, and the object side of the first lens 1 is convex, and the image side is concave;

[0087] The second lens 2 has a negative diopter, and the object side of the second lens 2 is convex, and the image side is concave;

[0088] The third lens 3 has a negative diopter, and the object side of t...

Embodiment 2

[0111] Such as Figure 4 As shown, compared with Embodiment 1, this embodiment mainly lies in that the optical parameters such as the radius of curvature of each lens surface and lens thickness are different.

[0112] The detailed optical data of this specific embodiment are shown in Table 2-1.

[0113] Detailed optical data of Table 2-1 Example 2

[0114]

[0115]

[0116] In this embodiment, some specific parameter values ​​are shown in Table 2-2.

[0117] Part of the detailed parameter data of Table 2-2 Embodiment 2

[0118] f2 f3 f4 fg1 fg2 f2 / f f3 / f f4 / f fg1 / f fg2 / f -32.5 -17.7 -18.5 -54.8 553.3 -6.8 -3.7 -3.8 -11.4 115.3

[0119] In this embodiment, please refer to the MTF curve diagram of the lens under visible light Figure 5 , as can be seen from the figure, when the spatial frequency of this lens reaches 130lp / mm, the MTF value of the full field of view is greater than 0.3, the image quality is excellent, and the re...

Embodiment 3

[0121] Such as Figure 7 As shown, compared with Embodiment 1, this embodiment mainly lies in that the optical parameters such as the radius of curvature of each lens surface and lens thickness are different.

[0122] The detailed optical data of this specific embodiment are shown in Table 3-1.

[0123] Detailed optical data of Table 3-1 Example 3

[0124]

[0125]

[0126] In this embodiment, some specific parameter values ​​are shown in Table 3-2.

[0127] Part of the detailed parameter data of Table 3-2 Example 3

[0128] f2 f3 f4 fg1 fg2 f2 / f f3 / f f4 / f fg1 / f fg2 / f -30.9 -17.7 -18.7 -54.4 1376.4 -6.4 -3.7 -3.9 -11.3 286.8

[0129] In this embodiment, please refer to the MTF curve diagram of the lens under visible light Figure 8 , as can be seen from the figure, when the spatial frequency of this lens reaches 130lp / mm, the MTF value of the full field of view is greater than 0.3, the image quality is excellent, and the reso...

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Abstract

The invention discloses a wide-angle low-distortion line scanning lens which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a diaphragm, a seventh lens, a fifth lens, a sixth lens, a sixth lens, a diaphragm, a ninth lens, a tenth lens, a twelfth lens, a thirteenth lens and a fifteenth lens which are sequentially arranged along an optical axis from an object side to an image side. The second lens, the third lens, the fourth lens, the fifth lens, the eighth lens, the eleventh lens and the fourteenth lens have negative diopters. The wide-angle low-distortion line scanning lens is high in resolution, a full-view-field transfer function image is still larger than 0.3 when the resolution is 130lp / mm, and the wide-angle low-distortion line scanning lens can be matched with a 3.5-micron 4K camera; the maximum optical distortion of the full view field of the lens is lower than 5%, and high measurement accuracy can still be ensured when the lens is at a large angle; meanwhile, the whole system is subjected to athermalization optimization, normal-temperature focusing and no out-of-focus at high and low temperatures, and the image quality is effectively guaranteed; the image plane of the lens is phi gt; the diameter is 14.36 mm, and the angle is 2Wgt; and the requirement of a larger view field can be met, and the application range is wide.

Description

technical field [0001] The invention relates to the technical field of optical lenses, in particular to a wide-angle low-distortion line-scanning lens. Background technique [0002] With the rapid development of industrial automation, the demand for machine vision is increasing, and it is widely used in various industries, such as manufacturing, quality inspection, logistics, medicine, scientific research, etc. The optical distortion, field of view and The requirements for the size of the image surface are getting higher and higher, especially for some wide-angle line scan lenses, which not only require a large image surface with a large angle, but also require small optical distortion. However, the existing line-scan lenses generally have the situation that optical distortion, field of view, image plane and working distance cannot be taken into account at the same time, which often leads to a situation in production and application: when the angle meets the detection requir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/06
CPCG02B13/06
Inventor 刘青天上官秋和张军光
Owner XIAMEN LEADING OPTICS