Small day and night confocal vehicle optical system and working method thereof

Abstract

The invention relates to a small day and night confocal vehicle optical system which comprises a front group A, a diaphragm C and a rear group B from the object side to the image side. The front groupA comprises a first biconcave lens and a first lenticular lens. The rear group B comprises a second biconcave lens, a meniscus positive lens and a second lenticular lens. The concave surface of the meniscus positive lens faces the diaphragm C. The invention further relates to a working method of the small day and night confocal vehicle optical system. The system provided by the invention has theadvantages of large light flux, high definition image quality, small-size and compact structure and the like, can keep picture imaging clear in the temperature range of 40 DEG C to +85 DEG C, is day and night confocal, can simultaneously carry out clear imaging of visible light and near infrared, and can be used for in-vehicle face monitoring, face recognition and gesture recognition.

Description

technical field [0001] The invention relates to a small day and night confocal vehicle-mounted optical system and its working method. Background technique [0002] At present, the scene monitoring in the car is becoming more and more important. Through face monitoring, the driver's fatigue monitoring and early warning can be realized; through face recognition, identity verification can be realized; through gesture recognition, gesture operation can be used instead of physical operation, which is very convenient. Operating experience. Due to the lack of light in the car at night, ordinary car lenses cannot monitor the environment inside the car at all, so this kind of lens needs to have day and night confocal performance, so the design difficulty is relatively high. At present, such lenses on the market generally use aspherical plastic lens solutions. Due to the large expansion coefficient of plastic lenses, they are prone to deformation at high temperatures, which will lead...

AI Technical Summary

Problems solved by technology

Due to the lack of light in the car at night, ordinary car lenses cannot monitor the environment inside the car at all, so this kind of lens needs to have day and night confocal performance, so the design difficulty is relatively high.

At present, such lenses on the market generally use aspherical plastic lens solutions. Due to the large expansion coefficient of plastic lenses, high temperature is prone to deformation, which will lead to blurred images at high temperatures.

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