Title:
NEAR-INFRARED BANDPASS FILTER AND OPTICAL SENSING SYSTEM
Document Type and Number:
WIPO Patent Application WO/2020/244221
Kind Code:
A1
Abstract:
A near-infrared bandpass filter (5) and an optical sensing system. The near-infrared bandpass filter (5) comprises a substrate (51), a main film system (52), and an auxiliary film system (53), wherein the main film system (52) is located on a first side of the substrate (51), the auxiliary film system (53) is located on a second side of the substrate (51), and the second side is opposite to the first side; the main film system (52) comprises a high refractive index film layer and a first low refractive index film layer that are provided according to a first preset stacking structure; the auxiliary film system (53) comprises a second low refractive index film layer and a third low refractive index film layer that are provided according to a second preset stacking structure, or the high refractive index film layer and the second low refractive index film layer that are provided according to the second preset stacking structure; within a wavelength range from 780 nm to 3,000 nm, the near-infrared bandpass filter (5) comprises at least one passband; when the temperature changes from -150°C to 300°C, the shift amount of the central wavelength of the at least one passband is less than 0.15nm/°C. The near-infrared bandpass filter (5) can be used for filtering light in a working environment of which the temperature changes, and the filtered light is stable, thereby improving the imaging quality of the optical sensing system.
Inventors:
CHEN CE (CN)
DING WEIHONG (CN)
CHEN HUIGUANG (CN)
FANG YEQING (CN)
XIAO NIANGONG (CN)
DING WEIHONG (CN)
CHEN HUIGUANG (CN)
FANG YEQING (CN)
XIAO NIANGONG (CN)
Application Number:
PCT/CN2019/130575
Publication Date:
December 10, 2020
Filing Date:
December 31, 2019
Export Citation:
Assignee:
XIN YANG SUNNY OPTICS CO LTD (CN)
International Classes:
G02B5/28; G02B5/20
Foreign References:
| CN110109208A | 2019-08-09 | |||
| CN108873135A | 2018-11-23 | |||
| CN208596240U | 2019-03-12 | |||
| CN109655954A | 2019-04-19 | |||
| CN107841712A | 2018-03-27 | |||
| CN108761614A | 2018-11-06 | |||
| JPH03210503A | 1991-09-13 | |||
| CN201910486854A | 2019-06-05 |
Other References:
See also references of EP 3982169A4
Attorney, Agent or Firm:
SEA INTELLECTUAL PROPERTY LAW FIRM (CN)
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