Large-aperture large-angle small high-low temperature confocal lens

Abstract

The invention discloses a large-aperture large-angle small high-low temperature confocal lens, which comprises a first glass spherical lens L1 with convex-concave negative focal power, a second plastic aspheric lens L2 with convex-concave negative focal power, a third plastic aspheric lens L3 with convex-concave negative focal power, a fourth glass aspheric lens L4 with double-convex positive focal power and a fifth plastic aspheric lens L5 with double-convex positive focal power, a sixth plastic aspheric lens L6 with double-concave negative focal power and a seventh plastic aspheric lens L7 with double-convex positive focal power which are sequentially arranged along the incident direction of light. The lens can realize a large aperture and a large field angle, is wide in visual field range, high in imaging quality, small in structure and low in cost, can stably work in different light and environments with large temperature difference, and is wide in application range.

Description

technical field [0001] The invention belongs to the technical field of optical lenses, and in particular relates to a small high and low temperature confocal lens with large aperture and large angle. Background technique [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 und...

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

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