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Large-field-angle machine vision lens

A technology of machine vision and field of view, applied in the lens field, can solve the problems of edge image quality degradation and distortion difficult to control, and achieve the effects of easy processing, excellent imaging quality, and guaranteed optical system performance

Active Publication Date: 2018-05-01
DONGGUAN YUTONG OPTICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The large target surface lens means a larger field of view at the same focal length, and the distortion is more difficult to control; and when the target distance of the traditional machine vision lens is far from the optimal working position, the edge image quality drops significantly

Method used

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  • Large-field-angle machine vision lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: In this embodiment, the physical and optical parameters of the first lens 1 to the twelfth lens 12 are shown in the following table:

[0037]

[0038]

[0039] Among them, R is the radius of the center of the surface, D is the distance on the optical axis from the corresponding optical surface to the next optical surface; Nd corresponds to the refractive index of d light (wavelength is 587nm), and the negative sign "-" represents the direction (object side The surface corresponds to a concave surface, and the image-side surface corresponds to a convex surface); S1 and S2 are the object-side surface and the image-side surface of the first lens 1, and S3 and S4 are the object-side surface and the image-side surface of the second lens 2 , S5 and S6 are the object-side surface and the image-side surface of the third lens 3, S7 and S8 are the object-side surface and the image-side surface of the fourth lens 4, S9 is the object-side surface of the first cem...

Embodiment 2

[0044] Embodiment 2: Compared with Embodiment 1, the focal length of Embodiment 2 is 16 mm, but the number of lenses used and the range of focal lengths remain unchanged, and only corresponding adjustments are made in terms of material matching and curvature radius. At the same time, the design has improved the combination of the lenses. Specifically, the second cemented lens 78 and the ninth lens 9 are cemented to form the third cemented lens 789; this can effectively improve the assembly accuracy and reduce the distance between the two surfaces. Reflective effect, improve the ability to correct chromatic aberration.

[0045] In this embodiment, the physical and optical parameters of the first lens 1 to the twelfth lens 12 are shown in the following table:

[0046] Face number

R(mm)

D(mm)

Nd

S1

23.5

4.8

Nd=1.74

S2

89.5

0.1

S3

30.4

1.0

Nd=1.50

S4

9.3

5.0

S5

-38.6

0.8

Nd=1.92

...

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Abstract

The invention provides a large-field-angle machine vision lens. The large-field-angle machine vision lens comprises a fixed lens group and a focusing lens group which are arranged along an optical axis, when a working distance is changed, the focusing lens group moves for focusing in the front-back direction relative to the fixed lens group, and therefore, an optimal imaging surface is found out.The large-field-angle machine vision lens is characterized in that the fixed lens group is arranged on one side of an object space of the focusing lens group, the fixed lens group, the focusing lens group and the whole lens meet the following conditional expression: 0.9< / =|ft / f|< / =1.6, |fg / f|> / =10, wherein ft is a focal length of the focusing lens group, fg is a focal length of the fixed lens group, and f is a focal length of the whole lens. The lens has the characteristics of high resolution, large target surface, large field angle, low distortion and the like.

Description

technical field [0001] The invention relates to the technical field of lenses, in particular to a machine vision lens with a large target surface and a large field of view. Background technique [0002] Machine vision lenses are widely used in manufacturing, quality inspection, logistics, medicine, scientific research and other fields. With the implementation of the Made in China 2025 strategy, industrial automation is developing rapidly, and machine vision lenses occupy an important position as the "eyes" of automated machines. [0003] Machine vision image acquisition equipment is divided into line array and area array according to the chip type. At present, area array cameras are widely used. Area array cameras are generally used to monitor and detect targets within a specific range at a fixed position; with the development of chip technology and the improvement of detection levels, higher requirements are placed on machine vision lenses; small footprint, large support t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/06G02B13/00
CPCG02B13/005G02B13/06
Inventor 张品光米士隆刘官禄毛才荧何剑炜
Owner DONGGUAN YUTONG OPTICAL TECH
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