Invention Grant
- Patent Title: Absorption type near infrared filter
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Application No.: US16224728Application Date: 2018-12-18
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Publication No.: US11378727B2Publication Date: 2022-07-05
- Inventor: Chung-Han Lu , Hsiao-Ching Shen , Chun-Cheng Hsieh , Ming-Zhan Wang
- Applicant: PTOT (SUZHOU) INC. , PLATINUM OPTICS TECHNOLOGY INC.
- Applicant Address: CN Suzhou; TW Taoyuan
- Assignee: PTOT (SUZHOU) INC.,PLATINUM OPTICS TECHNOLOGY INC.
- Current Assignee: PTOT (SUZHOU) INC.,PLATINUM OPTICS TECHNOLOGY INC.
- Current Assignee Address: CN Suzhou; TW Taoyuan
- Priority: CN201711371902.6 20171219
- Main IPC: G02B5/28
- IPC: G02B5/28 ; G02B5/20 ; G01N21/359 ; G02B5/22

Abstract:
An absorption type near-infrared filter comprising a first multilayer film, a second multilayer film, and an absorption film comprising an infrared absorbing dye with a weight percentage between 1% and 3%, wherein in the infrared band, the difference between the wavelength with the transmittance at 80% of the absorption film and the wavelength with the reflectivity at 80% of the first multilayer film ranges between 130 nm and 145 nm; the difference between the wavelength with the transmittance at 50% of the absorption film and the wavelength with the reflectivity at 50% of the first multilayer film ranges between 75 nm and 90 nm; the difference between the wavelength with the transmittance at 20% of the absorption film and the wavelength with the reflectivity at 20% of the first multilayer film ranges between 25 nm and 45 nm.
Public/Granted literature
- US20190187348A1 ABSORPTION TYPE NEAR INFRARED FILTER Public/Granted day:2019-06-20
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