2.8 fixed-focus ultra-wide-angle lens

An ultra-wide-angle lens and lens technology, used in installation, optics, instruments, etc., can solve the problems of low optical performance indicators, inability to have ultra-wide-angle, high-resolution large relative aperture, day and night confocal, etc., to achieve uniform illumination, high Resolution, effect of excellent aberration correction

Active Publication Date: 2015-08-12
FUJIAN FORECAM OPTICS CO LTD
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Problems solved by technology

However, its optical performance index is low. Although some can meet the high-definition requirements, there are many defects in the high-definition wide-angle when monitoring a small space. It cannot have the advantages of ultra-wide angle, high resolution, large relative aperture, and day and night confocal

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  • 2.8 fixed-focus ultra-wide-angle lens
  • 2.8 fixed-focus ultra-wide-angle lens

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Embodiment Construction

[0013] Such as figure 1 As shown, a 2.8 fixed-focus ultra-wide-angle lens, the optical system of the lens is respectively provided with a front group A, a diaphragm C and a rear group B along the incident direction of light from left to right, and the front group A is sequentially provided with a negative The crescent lens A-1, the negative crescent lens A-2 and the biconvex lens A-3, the focal length f of the front group A A =-9.8mm; the rear group B is sequentially provided with a biconvex lens B-1 and a cemented group consisting of a biconvex lens B-2 and a positive crescent lens B-3, and the focal length of the rear group B is f B =5.67mm.

[0014] In this embodiment, the air interval between the front group A and the rear group B is 1.16 mm; the air interval between the negative crescent lens A-1 and the negative crescent lens A-2 in the front group A is The air gap between the negative crescent lens A-2 and the bi-convex lens A-3 is 0.79 mm; the air gap between the bi-...

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Abstract

The invention relates to a 2.8 fixed-focus ultra-wide-angle lens. The optical system of the lens is respectively provided with a front group A, a diaphragm C and a rear group B along the incident direction of light from left to right, and the front group A is sequentially provided with a negative Crescent lens A-1, negative crescent lens A-2 and biconvex lens A-3, the focal length fA=-9.8mm of the front group A; the rear group B is provided with biconvex lens B-1 and double convex lens B -2 and the positive crescent lens B-3 are closely bonded, and the focal length of the rear group B is fB=5.67mm. The lens has the advantages of ultra-wide angle, high resolution, large relative aperture, day and night confocal, etc. It can be adapted to 3 million pixel high-resolution CCD or CMOS cameras. It is generally used in elevator cars, halls and other places with small viewing distance and large viewing angle. , is the mainstream product of micro-surveillance camera system.

Description

technical field [0001] The invention relates to a camera lens device of a monitoring system, in particular to a 2.8 fixed-focus ultra-wide-angle lens. Background technique [0002] There have been various fixed-focus lenses on the market for a long time, which are used in surveillance systems. However, its optical performance index is low. Although some can meet the high-definition requirements, there are many defects in the high-definition wide-angle when monitoring a small space. Contents of the invention [0003] In order to overcome the defects of existing fixed-focus lenses, the technical problem to be solved by the present invention is to provide a 2.8 fixed-focus ultra-wide-angle lens, which can ensure clear images and ultra-wide angles in a small space while possessing excellent sensitivity; , Even in low light or night conditions, it can ensure the high quality of the image, reaching megapixels. [0004] In order to solve the above technical problems, the techni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/06G02B13/00G02B1/00G02B7/02
Inventor 陈开阮肖维军林平
Owner FUJIAN FORECAM OPTICS CO LTD
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