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Low-distortion wide-angle lens

A wide-angle lens and lens technology, applied in the field of lenses, can solve the problems of low pixels, small field of view, large distortion, etc., and achieve the effects of reducing distortion, wide working distance, and correcting off-axis aberrations

Pending Publication Date: 2019-07-26
奥普特视觉科技(苏州)有限公司
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Problems solved by technology

With the development of technology, the requirements for distortion and resolution of wide-angle lenses are more stringent. The existing wide-angle machine vision lenses in China generally have different types or degrees of deficiencies such as low pixels, large distortion, and small field of view. Therefore, for distortion wide-angle lenses It is more urgent to develop

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[0023] If certain words are used to refer to specific components in the specification and claims, those skilled in the art should understand that the manufacturer may use different terms to refer to the same component. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. As mentioned throughout the specification and claims, "comprising" is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0024] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", horizontal" etc. are based on the drawings The orientat...

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Abstract

The invention relates to the technical field of lenses, and in particular to a low-distortion wide-angle lens, wherein an optical system of the low-distortion wide-angle lens comprises a front lens group (S1), a middle lens group (S2), a diaphragm (S4) and a focusing group (S3), which are arranged in sequence from an object plane to an image plane (S5) along the optical axis; and the focal lengthof the optical system is f, the focal length of the front lens group (S1) is f1, the focal length of the middle lens group (S2) is f2, the focal length of the focusing group (S3) is f3, which which satisfy the relational expression: 0.70 (|f1 / f|(1.60,1.8(|f2 / f|(4.0,2.0(|f3 / f|| (5.0. The low-distortion wide-angle lens provided by the invention has the characteristics of low distortion, can effectively reduce the distortion degree of the image, and adopts a floating focusing mode to meet the imaging requirements of a working distance greater than 100mm and different application requirements, and meanwhile the clear aperture can also be flexibly adjusted.

Description

technical field [0001] The invention belongs to the technical field of lenses, and in particular relates to a low-distortion wide-angle lens. Background technique [0002] In the context of industrial automation, machine vision systems have developed rapidly and are widely used in many fields such as measurement, judgment, defect detection, food packaging, intelligent logistics, and medical diagnosis. The lens is the core of the machine vision system, and its imaging quality is the key factor for the success of the machine vision system. Among them, the wide-angle lens has a large viewing angle and a wide field of view, and can be used to inspect the packaging status of high-density printed circuit boards, confirm the surface conditions such as lines on large-sized metal plates, detect micro-damages in sheet films, and inspect pixel loss of liquid crystal displays, etc. use. With the development of technology, the requirements for distortion and resolution of wide-angle le...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/17
CPCG02B15/17
Inventor 曾振煌林佳敏卢盛林
Owner 奥普特视觉科技(苏州)有限公司
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