Wide-angle lens with 2.6mm fixed focus
A wide-angle lens and lens technology, applied in optical components, optics, instruments, etc., can solve the problems of low optical performance index, difficult to achieve large wide-angle, and small number of day and night confocal lenses, and achieve a simplified optical structure and high resolution. , the effect of reducing production costs
Active Publication Date: 2015-12-23
FUJIAN FORECAM OPTICS CO LTD
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Problems solved by technology
In the early days, there were a variety of fixed-focus lenses used in security systems in the market. However, due to the low optical performance indicators of many products, most of them are low-end products, which can only be adapted to ordinary cameras with low pixels. It is difficult to achieve the advantages of large wide-angle, high resolution, day and night confocal, and fewer lenses
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[0014] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0015] Such as Figure 1~3 As shown, a 2.6mm fixed-focus wide-angle lens, the optical system of the lens is provided with the front group A of the lens group and the rear group B of the lens group with opposite refractive powers along the incident direction of the light from left to right. A diaphragm C is set between group A and rear group B, the front group A includes biconcave lens A-1 and biconvex lens A-2 arranged in sequence from left to right; the rear group B includes The double-convex lens B-1 and the negative crescent-shaped sheet lens B-2 are set as a cemented group in close contact.
[0016] In this embodiment, the radii of curvature on both sides of the biconvex lens A-1 are 49.89 mm and 3.10 mm respectively, the radii of curvature on both sides of the biconvex lens A-2 are 9.03 mm, and the two sides of the biconvex lens B-1 are ...
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Abstract
The invention relates to a wide-angle lens with a 2.6mm fixed focus. A lens group front group A and a lens group rear group B whose focal power are opposite to each other are arranged in an optical system of the lens along an incidence direction of light in sequence from left to right, a diaphragm C is arranged between the front group A and the rear group B, the front group A includes a biconcave lens A-1 and a biconvex lens A-2 arranged in sequence from left to right, and the rear group B includes a gluing group formed by tight connection of a biconvex lens B-1 and a negative crescent lens B-2 which are arranged in sequence from left to right. The wide-angle lens with the 2.6mm fixed focus has the advantages of large field angle, high resolution, day and night dual-purpose effect, simple optical structure and the like, and can be matched with a CCD or CMOS with 5 mega-pixel high resolution.
Description
technical field [0001] The invention relates to the field of optical camera devices of video technology, in particular to a 2.6mm fixed-focus wide-angle lens. Background technique [0002] The network camera was born in the mid-1990s. The lens is the main component of the camera, and its performance directly affects the image quality. In the early days, there were a variety of fixed-focus lenses used in security systems in the market. However, due to the low optical performance indicators of many products, most of them are low-end products, which can only be adapted to ordinary cameras with low pixels. It is difficult to achieve the advantages of large wide-angle, high resolution, day and night confocal, and fewer lenses. Contents of the invention [0003] The object of the present invention is to provide a 2.6mm fixed-focus wide-angle lens for the above deficiencies. [0004] The technical solution of the present invention is a 2.6mm fixed-focus wide-angle lens, the opt...
Claims
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Login to View More IPC IPC(8): G02B13/06
Inventor 苏眉英吴志良蔡鹏腾连东旭
Owner FUJIAN FORECAM OPTICS CO LTD