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A low distortion lens

A lens and lens technology, applied in the field of low-distortion lenses, can solve the problems of large distortion, insufficient resolution of peripheral field of view, small aperture, etc., and achieve low distortion, good imaging effect, and small size

Active Publication Date: 2020-09-08
FOSHAN HUAGUO OPTICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most short-focus industrial lenses currently on the market have shortcomings such as small aperture, large distortion, and insufficient resolution of the peripheral field of view, which can no longer meet the needs of the current market.

Method used

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Embodiment Construction

[0040] refer to figure 1 The present invention provides a low-distortion lens, which sequentially includes a first lens group G1, an iris 100 and a second lens group G2 along the light incident direction, and the first lens group G1 and the second lens group G2 both have Positive optical power, and can move along the optical axis;

[0041] The first lens group G1 includes a negative lens group G11 and a positive lens group G12, and the first lens group G1 and the second lens group G2 satisfy the following relationship:

[0042] 3

[0043] Wherein, f1 represents the focal length value of the first lens group G1, f2 represents the focal length value of the second lens group G2, and f11 represents the focal length value of the negative lens group G11 of the first lens group G1.

[0044] After being limited by the relational formula "3

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Abstract

The invention discloses a low-distortion lens comprising a first lens group, a variable diaphragm and a second lens group which are arranged in turn along the light incident direction. The first lensgroup and the second lens group have positive focal power and can move along the light axis. The first lens group comprises a negative lens piece group and a positive lens piece group, and the first lens group and the second lens group meet the following relationship: 3<f1 / f2<5; -0.3<f11 / f1<-0.1, wherein f1 represents the focal length value of the first lens group, f2 represents the focal length value of the second lens group, and f11 represents the focal length value of the negative lens piece group of the first lens group. According to the low-distortion lens, short focal length and large aperture can be realized, and the size is small so that low distortion can be realized, the imaging effect is great and the low-distortion lens can be widely applied to the optical lens industry.

Description

technical field [0001] The invention relates to the field of optical devices, in particular to a low-distortion lens. Background technique [0002] With the development of the field of machine vision, the short focal length wide-angle lens has gradually developed into the main equipment used in the field of machine vision, and its market share has gradually increased every year. In the field of machine vision, the main requirements for short focal length wide-angle lenses are small size, low distortion, and a clear full field of view. However, most of the short-focus industrial lenses on the market currently have shortcomings such as small aperture, large distortion, and insufficient resolution of the edge field of view, which can no longer meet the needs of the current market. SUMMARY OF THE INVENTION [0003] In order to solve the above technical problems, the purpose of the present invention is to provide a low distortion lens. [0004] The technical scheme adopted by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/00
CPCG02B13/0015G02B13/006
Inventor 王建平魏书贵陈伟苏耀年龙伟华谢俊敏刘勇谢宁王森联
Owner FOSHAN HUAGUO OPTICAL
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