Optical filter, optical device, and light-absorbing composition
US12313869B2 · kind B2 · utility
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20Claims
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Key dates
| Filing date | Sep 22, 2021 |
| Grant date | May 27, 2025 |
| Priority date | — |
| Expiry date | Feb 24, 2042 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10F39/12
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical filter 1a has a first transmission spectrum satisfying the following requirements (i), (ii), (iii), and (iv) at 25° C. (i) A minimum of a transmittance in a wavelength range of 450 nm to 600 nm is 70% or more. (ii) A maximum of the transmittance in a wavelength range of 300 nm to 370 nm is 5% or less. (iii) A maximum of the transmittance in a wavelength range of 800 nm to 1000 nm is 5% or less. (iv) A minimum of the transmittance in a wavelength range of 1500 nm to 1700 nm is 60% or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.