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An Economical 2.8mm Aspheric Zero Temperature Drift Optical System

An optical system and aspheric technology, applied in optics, optical components, instruments, etc., can solve the problems of increased cost and insufficient definition of 2.8mm fixed-focus wide-angle lens, and achieve the effect of cost realization

Active Publication Date: 2021-06-01
FUJIAN FORECAM OPTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention improves the above-mentioned problems, that is, the technical problem to be solved by the present invention is that the existing 2.8mm fixed-focus wide-angle lens has insufficient definition and adopts a multi-lens structure to increase the cost

Method used

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  • An Economical 2.8mm Aspheric Zero Temperature Drift Optical System
  • An Economical 2.8mm Aspheric Zero Temperature Drift Optical System

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Embodiment Construction

[0011] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0012] like figure 1 As shown, an economical 2.8mm aspheric day and night confocal optical system of this embodiment, the optical system includes the first meniscus lens A-1, the first aspheric lens A-1 and the first aspheric lens A-2, second meniscus lens A-3, stop D, second aspheric surface B1, third aspheric lens B2, biconvex lens B3; where first meniscus lens A-1, first aspheric lens A -2. The second meniscus lens A-3 constitutes the front group lens with negative refractive power, and the rear group composed of the second aspheric lens B1, the third aspheric lens B2 and the biconvex lens B3 has positive refractive power lens.

[0013] It can be seen from the above that the first meniscus lens A-1, the first aspheric lens A-2, and the second meniscus lens A-3 constitute the front lens group whose refractive power is negative, an...

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Abstract

The present invention provides an economical 2.8mm aspherical zero-temperature-drift optical system. The optical system includes a first meniscus lens, a first aspheric lens, and a second meniscus lens arranged at intervals from front to back along the incident light path. lens, diaphragm, second aspheric lens, third aspheric lens, biconvex lens; wherein said first meniscus lens, first aspheric lens and second meniscus lens constitute a negative front The lens group, the second aspherical lens, the third aspheric lens, and the rear lens group with positive refractive power formed by the biconvex lens, the present invention can achieve high resolution, zero temperature drift, day and night confocal, and can be used with 4K and below CCD or CMOS adaptation.

Description

technical field [0001] The invention relates to an economical 2.8mm aspherical zero temperature drift optical system. Background technique [0002] There are a variety of 2.8mm fixed-focus wide-angle lenses currently on the market for use in security systems. However, it is difficult for lenses designed with glass to meet market demand in terms of pixels and performance. In order to improve performance and pixels, more glass lenses are used to achieve higher-definition image quality, which greatly increases product costs and makes product promotion more difficult. At present, in the security industry, there are few low-cost, high-quality, low-temperature drift fixed-focus lenses in the true sense. Contents of the invention [0003] The present invention improves the above-mentioned problems, that is, the technical problem to be solved by the present invention is that the existing 2.8mm fixed-focus wide-angle lens has insufficient definition and adopts a multi-lens structu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/00G02B13/18
CPCG02B13/0035G02B13/18
Inventor 张荣曜周建宝张世忠肖维军
Owner FUJIAN FORECAM OPTICS CO LTD