Wavelength conversion element, wavelength converter, light source apparatus, and projector
US10725307B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 17, 2018 |
| Grant date | Jul 28, 2020 |
| Priority date | — |
| Expiry date | Oct 17, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B33/08
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A wavelength conversion element includes a substrate having a first surface, a first phosphor layer that has a first excitation light incident surface on which excitation light having a first wavelength is incident, is so provided as to face the first surface, a second phosphor layer that is so provided as to be in contact with part of the first excitation light incident surface, and a reflection layer that is provided between the first phosphor layer and the substrate. The first phosphor layer has an annular shape. The area of the second phosphor layer viewed in the direction in which the excitation light is incident is smaller than the area of the first phosphor layer viewed in the direction in which the excitation light is incident. The thickness of the second phosphor layer is smaller than the thickness of the first phosphor layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.