Title:
FRESNEL FILM AND PREPARATION METHOD THEREFOR, OPTICAL DETECTION MODULE, AND WEARABLE DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/246617
Kind Code:
A1
Abstract:
A Fresnel film (100), comprising a substrate (10) and Fresnel teeth (30) located on one surface of the substrate (10). The Fresnel film (100) further comprises a through hole (11) which is formed in the thickness direction of the Fresnel film (100) and penetrates through the substrate (10) and the Fresnel teeth (30), wherein the through hole (11) extends to form a closed ring. The Fresnel film (100) further comprises a light-shielding ink (50) filling the through hole (11), and the light-shielding ink (50) divides the Fresnel film (100) into two areas spaced apart from each other. An optical emitting area (13) and an optical receiving area (15) of the Fresnel film (100) can be effectively isolated, thereby avoiding optical crosstalk between the optical emitting area (13) and the optical receiving area (15). Also provided are a preparation method for the Fresnel film (100), an optical detection module (200) comprising the Fresnel film (100), and a wearable device.
Inventors:
TIAN YUQIANG (CN)
YANG SULIN (CN)
REN JINGXUAN (CN)
WANG XU (CN)
YANG SULIN (CN)
REN JINGXUAN (CN)
WANG XU (CN)
Application Number:
PCT/CN2023/100425
Publication Date:
December 28, 2023
Filing Date:
June 15, 2023
Export Citation:
Assignee:
HUAWEI TECH CO LTD (CN)
International Classes:
G02B5/00; G02B3/00; G02B3/08
Foreign References:
| CN111936892A | 2020-11-13 | |||
| CN107219573A | 2017-09-29 | |||
| CN107682598A | 2018-02-09 | |||
| CN113740944A | 2021-12-03 | |||
| CN113866934A | 2021-12-31 | |||
| CN213934271U | 2021-08-10 | |||
| CN216700554U | 2022-06-07 | |||
| CN216724540U | 2022-06-14 | |||
| DE102016125381A1 | 2018-06-28 | |||
| JP2004151205A | 2004-05-27 | |||
| JP2006039146A | 2006-02-09 | |||
| JP2016176981A | 2016-10-06 |
Attorney, Agent or Firm:
SHENZHEN SCIENBIZIP INTELLECTUAL PROPERTY AGENCY CO., LTD. (CN)
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