High-pixel large-angle infrared confocal optical lens

Abstract

The invention discloses a high-pixel large-angle infrared confocal optical lens. The optical lens comprises a first plastic aspheric lens L1 with convex-concave negative focal power, a second plasticaspheric lens L2 with concave-convex negative focal power, a third plastic non-planar lens L3 with concave-convex negative focal power, a fourth glass spherical lens L4 with the double-convex positivefocal power, a fifth glass spherical lens L5 with the double-convex positive focal power, a sixth glass spherical lens L6 with the double-concave negative focal power, and a seventh plastic asphericlens L7 with the double-convex positive focal power which are sequentially arranged in the incident direction of light, wherein the second plastic aspheric lens L2 has concave-convex positive focal power, the L5 and the L6 are glued together to form a first glued lens J1, and the lens adopts a 3G4P structure so that the cost is reduced. The optical lens is compact in structure by reasonably distributing focal power, tolerance sensitivity is greatly reduced, various aberrations are well corrected by reasonably adopting the plastic aspheric lenses, and the imaging quality is greatly improved.

Description

technical field [0001] The present invention is mainly aimed at the small-sized optical device with large aperture for security monitoring and ensuring no defocusing at -40°C to 85°C. Background technique [0002] At present, the domestic closed-circuit monitoring industry (CCTV) is developing in the direction of miniaturization, multi-function, and strong environmental adaptability, and under the fierce domestic competition, fixed-focus lenses can no longer meet the needs of customers in different regions, such as Northeast my country The market requires the design of a monitoring device that is placed outdoors and does not defocus all year round. The temperature in Northeast my country is often minus 30°C in winter, and the highest temperature in summer will reach about 31°C. Considering the circuit heating factor of the surveillance camera, it is necessary to design an optical imaging device that does not shift the inner focal plane at -40°C to 85°C. According to the auth...

AI Technical Summary

Problems solved by technology

[0002] At present, the domestic closed-circuit monitoring industry (CCTV) is developing in the direction of miniaturization, multi-function, and strong environmental adaptability, and under the fierce domestic competition, fixed-focus lenses can no longer meet the needs of customers in different regions, such as Northeast my country The market requires the design of a monitoring device that is placed outdoors and stays in focus all year round. The temperature in Northeast my country is often minus 30°C in winter, and the highest temperature in summer will reach about 31°C.

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