Optical filter and device using the same
US10605969B2 · kind B2 · utility
2Cited by
1References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 12, 2017 |
| Grant date | Mar 31, 2020 |
| Priority date | — |
| Expiry date | Dec 26, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical filter is provided with a structure that contains a green coloring matter and a black coloring matter and satisfies the following requirements (i) and (ii). Further a device is provided with such an optical filter. (i) An average transmittance of light in the wavelength range of 400 to 730 nm is 2% or less. (ii) A continuous 50 nm wavelength range where an average transmittance is 80% or more exists in the wavelength range of 800 to 1000 nm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.