2.8mm black-light-level day-night dual-purpose large-light-transmission prime lens and assembling method thereof

Abstract

The invention relates to a 2.8mm black-light-level day-night dual-purpose large-light-transmission prime lens and an assembling method thereof. An optical system of the lens comprises a front lens group A with negative focal power and a rear lens group B with positive focal power which are sequentially arranged from front to back along an incident light path, wherein the front lens group A comprises a negative meniscus lens A-1, a negative meniscus lens A-2 and a biconvex lens A-3 which are sequentially arranged from front to back; and the rear lens group B comprises a cemented lens group formed by tightly connecting a positive meniscus lens B-1 and a biconvex lens B-2, a biconvex lens B-3, a biconcave lens B-4 and a biconvex lens B-5 which are sequentially arranged from front to back. According to the invention, the prime lens is simple in structure, reasonable in design, low in manufacturing cost, short in total optical path length, small in size and good in imaging quality; and theF value is extremely small, the light flux of the lens is improved, the whole picture is enabled to be brighter, the performance of the lens in a low-illumination environment is better, a clearer imaging effect is presented, and a day-night universal function is realized.

Description

Technical field [0001] The invention relates to a 2.8mm black light-level day and night dual-purpose large-power fixed-focus lens and an assembly method thereof, and belongs to the technical field of optical devices. Background technique [0002] With the rapid development of the camera lens market, in recent years, a relatively standardized, stable, and micro camera lens that can be used with cameras has been formed. Under stable lens imaging conditions, customers' requirements for the amount of light through the lens continue to increase. The current security lens on the market has the problem of small light flux and insufficient image clarity. Summary of the invention [0003] In view of this, the purpose of the present invention is to provide a 2.8mm black light level day and night dual-purpose large-clear fixed-focus lens with small volume, large light transmission and good image quality. [0004] The present invention adopts the following scheme to achieve: a 2.8mm black ligh...

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of the camera lens market, in recent years, a relatively standardized, stable, and miniature camera lens that can be used with cameras has been formed. Under stable lens imaging conditions, customers' requirements for lens light flux continue to increase. The current security lens on the market has the problem of low light transmission and insufficient image clarity.

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