Infrared confocal wide-angle lens

A wide-angle lens, infrared confocal technology, applied in the field of infrared confocal wide-angle lens, can solve the problems of peripheral vignetting, high production cost, and the finished product is not light enough, and achieves the effect of small temperature drift, good temperature performance and low production cost.
CN113467059BActive Publication Date: 2022-02-11JIANGXI LIANCHUANG ELECTRONICS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
JIANGXI LIANCHUANG ELECTRONICS CO LTD
Publication Date
2022-02-11

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Abstract

The invention provides an infrared confocal wide-angle lens, comprising six lenses in total, which sequentially comprise from the object side to the imaging surface along the optical axis: a first lens with negative refractive power, the object side is convex, and the image side is concave; A second lens with a power that is concave on the object side and convex on the image side; a stop; a third lens with positive power that is convex on both the object and image sides; a fourth lens with negative power , its object side and image side are both concave; the fifth lens with positive power, its object side and image side are both convex; the sixth lens with negative power, its object side is convex at the near optical axis , the image side is concave at the near optical axis; the infrared confocal wide-angle lens satisfies the conditional formula: 160°≤FOV≤180°, 0.2<f / TTL<0.3, where: FOV represents the maximum field of view of the infrared confocal wide-angle lens, f Indicates the effective focal length of the infrared confocal wide-angle lens, and TTL indicates the distance from the object side of the first lens to the imaging plane on the optical axis.
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Description

technical field

[0001] The invention relates to the technical field of optical lenses, in particular to an infrared confocal wide-angle lens. Background technique

[0002] Infrared confocal is currently the lens technical specification proposed by the vehicle and security industries, and it is the development trend of the future market. However, most of the current infrared confocal lenses used in vehicles and security systems generally have a large amount of infrared and visible defocus, and it is difficult to achieve high-definition requirements for daytime and night imaging at the same time. The cost is high, the temperature drift is large, the finished product is not light enough, and there are technical problems such as vignetting around. Contents of the invention

[0003] The present application provides an infrared confocal wide-angle lens that is applicable to vehicle installation and can at least overcome at least one of the above-mentioned defects in the prior a...

Claims

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