Title:
INFRARED PROJECTION LENS
Document Type and Number:
WIPO Patent Application WO/2023/216219
Kind Code:
A1
Abstract:
An infrared projection lens with an excellent projection performance is provided. The lens is comprised of a diaphragm, a first lens, a second lens, and a third lens, which are sequentially arranged from an imaging side to a light source side. The first lens is a lens having a positive focal power, and has a concave surface on a paraxial imaging side and a convex surface on a paraxial light source side, and at least one of the two surfaces of the first lens is aspheric. The second lens is a lens having a negative focal power, and has a concave surface on the paraxial imaging side and a convex surface on the paraxial light source side, and at least one of the two surfaces of the second lens is aspheric. The third lens is a lens having a positive focal power, and has a convex surface on the paraxial imaging side, and at least one of two surfaces of the third lens is aspheric. The lens satisfies 0.1<|Y/(f*TTL)|<0.4, where f is a focal length of the lens, Y is a maximum object height of the lens, and TTL is a distance between a diaphragm surface and an imaging surface of the lens.
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Inventors:
XU BAIWEI (CN)
ZHANG SICHAO (CN)
ZHANG SICHAO (CN)
Application Number:
PCT/CN2022/092637
Publication Date:
November 16, 2023
Filing Date:
May 13, 2022
Export Citation:
Assignee:
SHENZHEN GOODIX TECH CO LTD (CN)
International Classes:
G02B9/14; G02B13/14; G03B21/00
Foreign References:
| CN108427183A | 2018-08-21 | |||
| CN107589516A | 2018-01-16 | |||
| CN107505689A | 2017-12-22 | |||
| KR20080024886A | 2008-03-19 |
Attorney, Agent or Firm:
LONGSUN LEAD IP LTD. (CN)
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