A small high-low temperature confocal lens with large aperture and large angle

Abstract

The invention discloses a small high-low temperature confocal lens with a large aperture and a large angle. L2, the third plastic aspheric lens with convex and concave negative power L3, the fourth glass aspheric lens with double convex positive power L4, the fifth plastic aspheric lens L5 with double convex positive power, double concave negative power The sixth plastic aspherical lens L6 and the seventh plastic aspherical lens L7 of biconvex positive refractive power. The lens can achieve large aperture and large field of view, wide field of view, high imaging quality, compact structure, low cost, can work stably in environments with different light and large temperature differences, and has a wide range of applications.

Description

technical field [0001] The invention belongs to the technical field of optical lenses, and in particular relates to a large-aperture, large-angle, small high-low temperature confocal lens. Background technique [0002] At present, the domestic closed-circuit surveillance industry (CCTV) is developing in the direction of miniaturization, multi-function, and strong environmental adaptability, and the domestic competition is very fierce, and ordinary lenses can no longer meet the needs of customers in different regions. The existing technology mainly has the following defects: 1) the environment in different regions in China is complex, and it cannot adapt to the environment with large temperature difference, which is easy to cause defocusing and affect the shooting effect; 2) the monitoring camera itself has circuit heating for a long time, which affects the focusing; 3) existing The camera is prone to lack of color, unclear details and insufficient brightness under infrared s...

AI Technical Summary

Problems solved by technology

[0002] At present, the closed-circuit monitoring industry (CCTV) in China is developing in the direction of miniaturization, multi-function, and strong environmental adaptability, and the domestic competition is very fierce. Ordinary lenses can no longer meet the needs of customers in different regions.

The existing technology mainly has the following defects: 1) The environment in different regions in the country is complex, and it cannot adapt to the environment with large temperature differences, which may easily cause defocusing and affect the shooting effect; 2) The monitoring camera itself has circuit heating for a long time, which affects the focus; 3) The existing The camera is prone to lack of color, unclear details and insufficient brightness under infrared supplementary light, and the imaging quality is poor at night or in dark areas; 4) The shooting angle is small, the field of view is narrow, and the collection of security data information is insufficient

Images