Day-night dual-purpose 4mm aspheric ultra-clear 4K optical system

Abstract

The invention provides a day-night dual-purpose 4mm aspheric ultra-clear 4K optical system. A front group A, an aperture and a rear group B are arranged sequentially in the incident direction of lightfrom left to right along an incident optical path from left to right respectively, wherein the front group A comprises a double concave lens A-1, an aspheric lens A-2 and a double convex lens A-3 which are arranged sequentially and the rear group B comprises a gluing group comprising an aspheric lens B-1 and an aspheric lens B-2, the front group is negative focal power and the rear group is positive focal power, according to the 4mm fixed focus 4K lens disclosed by the invention, spherical aberrations and high-order aberrations are corrected by double aspheric surfaces of the rear group, thehigh-order aberrations are compensated with aspheric surfaces of the front group and the focal powers of the lenses are reasonably calculated and distributed, so that focuses at high temperature in low-temperature environments have no deviations, and the effect of focusing day and night together is reached, incidence angles of the lenses in the system are lowered, the lens sensitivity is reduced to truly achieve the high-definition camera level, in the case of lacking of the light or being at night, the day-night dual-purpose 4mm aspheric ultra-clear 4K optical system further has the high-definition image quality, thereby still being capable of forming perfect images in harsh environments at different temperatures.

Description

technical field [0001] The invention relates to a 4mm aspheric day and night ultra-clear 4K optical system. Background technique [0002] In the early days, there were a variety of fixed-focus high-definition lenses used in security systems. However, due to structural size limitations, glass material and shape limitations, system aberrations were difficult to correct, resulting in unsatisfactory imaging results. With the development of plastic aspheric surfaces and the improvement of processing precision, the aberrations of the imaging system have been corrected in depth, the imaging quality has been greatly improved, and the cost of the lens has been reduced. At present, in the security industry, there are few true 4K ultra-clear, low-temperature drift fixed-focus lenses. Contents of the invention [0003] The present invention improves the above problems, that is, the technical problem to be solved by the present invention is to provide a 4K fixed-focus lens with better...

AI Technical Summary

Problems solved by technology

At present, in the security industry, there are few true 4K ultra-clear, low-temperature drift fixed-focus lenses

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