Title:
OPTICAL FILTER AND INFRARED IMAGE SENSING SYSTEM COMPRISING SAME
Document Type and Number:
WIPO Patent Application WO/2020/029579
Kind Code:
A1
Abstract:
An optical filter and an infrared image sensing system comprising same. The optical filter comprises a glass substrate (1) and an IR coating (2) and an anti-reflection (AR) coating (3) on the two opposite surfaces of the glass substrate (1); the IR coating (2) comprises a first refractive index material layer, a second refractive index material layer, and a third refractive index material layer; the refractive index of the third refractive index material layer is greater than the refractive index of the first refractive index material layer, and the refractive index of the second refractive index material layer is greater than the refractive index of the third refractive index material layer. The optical filter has a good AR effect on near infrared light, thereby ensuring high face recognition and gesture recognition accuracy. In addition, the adhesion of the coating of the optical filter can be effectively improved while the coating of the optical filter becomes thinner.
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Inventors:
CHEN CE (CN)
DING WEIHONG (CN)
XIAO NIANGONG (CN)
CHEN JILI (CN)
DING WEIHONG (CN)
XIAO NIANGONG (CN)
CHEN JILI (CN)
Application Number:
PCT/CN2019/077849
Publication Date:
February 13, 2020
Filing Date:
March 12, 2019
Export Citation:
Assignee:
XINYANG SUNNY OPTICS CO LTD (CN)
International Classes:
G02B5/20
Foreign References:
| CN108897085A | 2018-11-27 | |||
| CN105911625A | 2016-08-31 | |||
| CN206638842U | 2017-11-14 | |||
| CN203287553U | 2013-11-13 | |||
| EP1701182A1 | 2006-09-13 | |||
| US9977160B1 | 2018-05-22 | |||
| CN201810884048A | 2018-08-06 |
Other References:
See also references of EP 3671294A4
Attorney, Agent or Firm:
CREDOIP INTELLECTUAL PROPERTY AGENCY (CN)
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