Ultra-low illumination low-light zoom lens and its control method
A zoom lens and illuminance technology, applied in optics, optical components, installation, etc., can solve the problems of shortening the monitoring distance, affecting the system monitoring ability, blurring the image, etc., and achieve the effect of improving the monitoring ability
Active Publication Date: 2017-04-12
FUJIAN FORECAM OPTICS CO LTD
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Problems solved by technology
[0002] The existing conventional monitoring camera lens has a small light aperture and a narrow response spectrum. Under special weather conditions such as rain, snow, and mist, the transmission ability of incident light decreases, especially in low-light and low-light environments. The energy of the light reaching the detector through the lens is insufficient, which shortens the monitoring distance, resulting in dim video images, decreased contrast and clarity, and blurred images, seriously affecting the monitoring capabilities of the system
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[0023] Such as Figure 1~6 As shown, an ultra-low-illuminance low-light zoom lens, the optical system of the lens is sequentially provided with a front fixed group A with a positive focal power, a zoom group B with a negative focal power, and an automatic aperture along the incident direction of light. F, the rear fixed group C with positive refractive power, the compensation group D with positive refractive power, and the color filter conversion assembly E; the mechanical structure of the lens includes the lenses arranged in sequence along the incident direction of the light on the main lens barrel The front group focusing assembly, zoom compensation zoom assembly.
[0024] In this embodiment, the front fixed group A is sequentially provided with the first cemented group and the positive crescent lens A-3, which are closely connected by the negative crescent lens A-1 and the biconvex lens A-2, and the variable power group B is sequentially provided with There is a biconcave ...
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The invention relates to an ultralow-illumination low light zooming lens and a control method thereof. The optical system of the lens is sequentially provided with a front fixing group A with positive focal power, a zoom group B with negative focal power, an auto iris, a rear fixing group C with positive focal power, a compensation group D with positive focal power, and a filter conversion assembly E along a light incidence direction. The mechanical structure of the lens comprises a front group focusing assembly and a zoom compensation zoom assembly sequentially along the light incidence direction. Functions of electrical zooming, electrical focusing, auto iris and filter conversion are provided, high resolution of a wide spectral range from 420nm to 950nm and a large relative aperture of 1 to 1 are provided, photoelectric signals can be provided for a camera in special weathers such as rain, snow, and mist, and in an ultralow-illumination low light environment, a video image with high resolution can also be generated, and the monitoring ability is effectively improved.
Description
technical field [0001] The invention relates to an optical camera device of photoelectric video technology, in particular to an ultra-low-illuminance low-light zoom lens and a control method thereof. Background technique [0002] The existing conventional monitoring camera lens has a small light aperture and a narrow response spectrum. Under special weather conditions such as rain, snow, and mist, the transmission ability of incident light decreases, especially in low-light and low-light environments. The energy of the light reaching the detector through the lens is insufficient, which shortens the monitoring distance, resulting in dim video images, decreased contrast and clarity, and blurred images, seriously affecting the monitoring capabilities of the system. Contents of the invention [0003] In order to overcome the deficiencies in the prior art, the purpose of the present invention is to provide a kind of ultra-low illumination low-light zoom lens with high resolutio...
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IPC IPC(8): G02B15/173G02B7/04G02B7/00
Inventor 刘辉林春生周宝藏陈潇张清苏
Owner FUJIAN FORECAM OPTICS CO LTD