High-performance infrared confocal super-definition security lens

Abstract

The invention discloses a high-performance infrared confocal super-definition security lens, which comprises a first lens to a fifteenth lens, each of the first to fifteenth lenses comprises an object side surface and an image side surface; the first to third lenses form a fixed lens group; the fourth lens to the sixth lens form a zoom lens group; the seventh lens to the ninth lens form a fixed lens group; the tenth lens to the fifteenth lens form a compensation lens group; and the optical imaging lens has only fifteen lenses with refractive indexes. The large-light-transmission design is adopted, and it is guaranteed that the relative illuminance of the edge of an imaging face is uniform; the whole system adopts athermalization optimization, and under the condition of normal-temperature focusing, defocusing is avoided at high and low temperatures; the color difference optimization is good, the image color reducibility is good, and no blue-purple edge phenomenon exists; TTL is very short, and the total structure is short; the resolution is high, the edge imaging is clear, the 4K requirement can be met, and the image quality is clear and stable; and the infrared confocal property is good, and clear imaging can be ensured in a night mode.

Description

technical field [0001] The invention relates to the field of lens technology, in particular to a high-performance infrared confocal ultra-clear security lens. Background technique [0002] The security lens generally refers to the monitoring lens of the surveillance camera. The security lens is widely used because of its advantages such as high sensitivity, anti-glare, small distortion, small size, long life, and anti-vibration. There are still many deficiencies in the existing security lenses, such as: the zoom lens of this focal length segment has relatively small light transmission, the aperture value is generally greater than 2.2 for short focal lengths, and 3 or even larger for telephoto lenses, and the relative illumination at the edge of the imaging surface is relatively low ;The working temperature range that the zoom lens of this focal length segment can support is very small, and when it is used in a high and low temperature environment, the out-of-focus is very se...

AI Technical Summary

Problems solved by technology

There are still many deficiencies in the existing security lenses, such as: the zoom lens of this focal length segment has relatively small light transmission, the aperture value is generally greater than 2.2 for short focal lengths, and 3 or even larger for long focal lengths, and the relative illumination at the edge of the imaging surface is relatively low ;The working temperature range that the zoom lens of this focal length segment can support is very small, and when used in a high and low temperature environment, the out-of-focus is very serious; the general chromatic aberration optimization of the lens is insufficient, and blue-purple fringing is prone to occur; the zoom lens of this focal length segment has a relatively large TTL , the overall length of the structure is also relatively long; the resolution of the zoom lens in this focal length range is not high, and the edge imaging is not clear; the zoom lens in this focal length range can see the focus, and the infrared imaging effect is poor

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