Optical imaging lens

Abstract

The invention relates to the technical field of lenses, in particular to an optical imaging lens, which sequentially comprises a first lens, a second lens, a third lens and a fourth lens from an object side to an image side along an optical axis; the first lens is a convex-concave lens with a negative refractive index; the second lens is a convex-concave lens with positive refractive index; the third lens is a concave-convex lens with a negative refractive index, the fourth lens has a positive refractive index, the object side surface of the fourth lens is a convex surface, and the third lens and the fourth lens are plastic aspheric lenses; and the optical imaging lens satisfies the following conditions: T3>=0.76 mm, and T3 / T31<=1.28. The invention has the total optical length; the cost is low; the optical system is good in stability when used in high-temperature and low-temperature environments; the aperture is large; the distortion is low; and the lens has the advantage of high resolution when being used at a short object distance.

Description

technical field [0001] The invention belongs to the field of lens technology, in particular to an optical imaging lens used in a driver monitoring system (DMS). Background technique [0002] With the continuous advancement of science and technology and the continuous development of society, optical imaging lenses have also developed rapidly in recent years, and are widely used in smart phones, tablet computers, video conferencing, security monitoring, intelligent transportation systems, vehicle monitoring, etc. Therefore, the requirements for optical imaging lenses are getting higher and higher. [0003] However, there are still many deficiencies in the DMS (Driver Monitoring System) monitoring lens currently on the market, such as poor stability of the optical system, large changes in lens surface shape when used in high and low temperature environments, which affects the use effect, and cannot meet the requirements of the vehicle -40°C High and low temperature requirement...

AI Technical Summary

Problems solved by technology

[0003] However, there are still many deficiencies in the DMS (Driver Monitoring System) monitoring lens currently on the market, such as poor stability of the optical system, large changes in lens surface shape when used in high and low temperature environments, which affects the use effect, and cannot meet the requirements of the vehicle -40°C High and low temperature requirements of ~110°C; the number of lenses used is large, the total length is long, and the cost is high; the optical distortion is large, and the imaging deformation is serious; the aperture is small, and the imaging effect is not good in a relatively dark environment; the use of close object distance When the optical transfer function control needs to be improved and the resolution is low, it can no longer meet the increasing requirements of users, and urgently needs to be improved.

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