Small vehicle-mounted optical system and imaging method thereof

Abstract

The present invention relates to a small vehicle-mounted optical system. An optical system of a lens is successively provided with a first lens, a second lens, an aperture, a third lens, a fourth lens, a fifth lens and a sixth lens from left to right along an incident direction of light, wherein the first lens is a double concave negative lens, the second lens is a meniscus positive lens, the first lens and the second lens constitute an anterior lenses with a negative focal power; the third lens is a biconcave negative lens, the fourth lens is a biconvex positive lens, the third lens and the fourth lens are closely connected to form a lens bonding group, the fifth lens is a biconvex positive lens, the sixth lens is a meniscus negative lens, and the fifth lens and the sixth lens are closelyconnected to form a lens bonding group, and the two lens bonding groups constitute a posterior lenses with a positive focal power. The small vehicle-mounted optical system of the present invention isreasonable in structural design, has the advantages of high light flux and high-definition image quality and temperature compensation function, can keep clear imaging at -40 DEG C - 85 DEG C, and hasa day and night confocal function and obtains imaging with good quality in visible light band and near infrared band.

Description

technical field [0001] The invention relates to a small vehicle-mounted optical system and an imaging method thereof. Background technique [0002] Among vehicle lenses, in-vehicle surveillance lenses are widely used. With the development of the smart car industry, the in-vehicle monitoring system is required to provide functions such as face monitoring, face recognition, gesture recognition, etc., and the corresponding requirements for on-board monitoring lenses are also getting higher and higher. In-vehicle surveillance cameras mainly face the following problems: [0003] 1. The light environment in the car is quite different in the morning and evening. During the daytime, it is required to have good imaging in the visible light band, while in the night time, it is necessary to consider the imaging quality of the optical system for the near-infrared band. Therefore, the in-car monitoring needs to provide day and night confocal functions; [0004] The design of day and ni...

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Problems solved by technology

[0004] The design of day and night confocal lens solutions is quite difficult, and many small lens solutions for in-vehicle monitoring on the market do not have day and night confocal performance

[0005] 2. At present, the small lens solutions for in-vehicle monitoring on the market generally use aspherical plastic lenses. The expansion coefficient of plastic lenses is large, and they are prone to deformation at high temperatures, which will lead to blurred images at high temperatures.

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