Invention Grant
- Patent Title: Optical filter and light-emitting device
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Application No.: US17286884Application Date: 2019-10-23
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Publication No.: US12099221B2Publication Date: 2024-09-24
- Inventor: Shunichi Kajiya , Hiroshi Tazawa , Kazuhiko Noda , Kyoko Sakurai
- Applicant: Dexerials Corporation
- Applicant Address: JP Tokyo
- Assignee: Dexerials Corporation
- Current Assignee: Dexerials Corporation
- Current Assignee Address: JP Tokyo
- Agency: KENJA IP LAW PC
- Priority: JP 18200171 2018.10.24 JP 19055115 2019.03.22
- International Application: PCT/JP2019/041538 2019.10.23
- International Announcement: WO2020/085387A 2020.04.30
- Date entered country: 2021-04-20
- Main IPC: G02B5/22
- IPC: G02B5/22

Abstract:
An optical filter includes a transmission portion transmitting light and an absorption portion absorbing light between a plane of incidence and a plane of emission, and the volume of the transmission portion is larger than the volume of the absorption portion. For the optical filter, when the transmission spectrum S0 of light incident at an incidence angle of 0° and the transmission spectrum S60 of light incident at an incidence angle of 60° are superimposed, the transmittance (%) at an incidence angle of 60° is lower than the transmittance (%) at an incidence angle of 0° by 15% or more for a first wavelength band, and the difference between the transmittance (%) at an incidence angle of 60° and the transmittance (%) at an incidence angle of 0° is 10% or less for a second wavelength band.
Public/Granted literature
- US20210382214A1 OPTICAL FILTER AND LIGHT-EMITTING DEVICE Public/Granted day:2021-12-09
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