Day and night prime lens with high resolution ratio

A fixed-focus lens, high-resolution technology, applied in the field of high-resolution day and night fixed-focus lenses, can solve the problems of narrow spectral range, large picture aberration, poor authenticity, etc., to achieve uniform illumination and excellent aberration correction. Effect

Active Publication Date: 2014-08-13
FUJIAN FORECAM OPTICS CO LTD
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  • Claims
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Problems solved by technology

[0002] The emergence and application of small TV surveillance cameras have a history of 20 to 30 years. There are various specifications and models of miniature camera lenses to match them. Their performance indicators vary, and most of them are low-end products with low performance indicators. Applicabl

Method used

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  • Day and night prime lens with high resolution ratio

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Embodiment Construction

[0016] like figure 1 As shown, a high-resolution day and night dual-purpose fixed-focus lens, the optical system of the lens is sequentially provided with a front group A with a negative focal power and a rear group with a positive focal power along the incident direction of the light from left to right B, the front group A is sequentially provided with a negative crescent lens A-1 and a biconcave lens A-2, and the focal length of the front group A is f A =-8.66mm; the rear group B is sequentially provided with a double-convex lens B-1 and a cemented group consisting of a double-convex lens B-2 and a double-concave lens B-3, and the focal length of the rear group B is f B =6.92mm.

[0017] In this embodiment, the air gap between the front group A and the rear group B is 4.85mm, and the air gap between the negative crescent lens A-1 and the biconcave lens A-2 in the front group A is 0..35mm, the air space between the lenticular lens B-1 in the rear group B and the cemented gr...

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Abstract

The invention relates to a day and night prime lens with high resolution ratio. A front set A with the negative focal power and a rear set B with the positive focal power are sequentially arranged in an optical system in the incident direction of light from left to right, the front set A is sequentially provided with a negative crescent lens A-1 and a biconcave lens A-2, the focal length fA of the front set A is equal to -8.66 mm, the rear set B is sequentially provided with a biconvex lens B-1 and a gluing set which is formed by sealing a biconvex lens B-2 and a biconcave lens B-3, and the focal length fB of the rear set B is equal to 6.92 mm. According to the lens, the focal power of the front set A and the focal power of the rear set B are reasonably distributed, and the day and night prime lens has the advantages of being large in relative aperture, high in resolution, wide in spectrum, confocal and the like, and is a mainstream product in a micro type television monitoring and image pickup system.

Description

technical field [0001] The invention relates to an optical camera device of video technology, in particular to a high-resolution day and night dual-purpose fixed-focus lens. Background technique [0002] The emergence and application of small TV surveillance cameras have a history of 20 to 30 years. There are various specifications and models of miniature camera lenses to match them. Their performance indicators vary, and most of them are low-end products with low performance indicators. It is suitable for ordinary cameras with 200,000 to 300,000 pixels; the adaptive spectral range is narrow, and can only be used under daytime light conditions of 480nm to 700nm; the image distortion is large, and the difference between image distortion and the real scene becomes larger, and the authenticity is poor. Contents of the invention [0003] In order to adapt to the development of high-definition micro-camera, improve the image quality of the micro-video camera system, improve the...

Claims

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Application Information

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IPC IPC(8): G02B13/14G02B13/00G02B7/02G02B27/00G02B1/00
Inventor 叶维森刘辉陈开阮江伟
Owner FUJIAN FORECAM OPTICS CO LTD
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