Wavelength conversion element, light source device, projector, and method for manufacturing wavelength conversion element

Patent metadata

Field	Value
Publication number	US-2016147136-A1
Application number	US-201514942364-A
Country	US
Kind code	A1
Filing date	Nov 16, 2015
Priority date	Nov 25, 2014
Publication date	May 26, 2016
Grant date	—

Abstract

The invention relates to a wavelength conversion element including: a phosphor layer including a first surface and fluorescence-emitting points dispersed therein; a reflection surface provided on the opposite side of the phosphor layer from the first surface; and a substrate provided on the opposite side of the reflection surface from the phosphor layer. The phosphor layer includes a first region on the first surface side and a second region located between the first region and the reflection surface. A concentration of the fluorescence-emitting points in the second region is higher than a concentration of the fluorescence-emitting points in the first region.

First claim

What is claimed is:

1 . A wavelength conversion element comprising:
a phosphor layer including a first surface and fluorescence-emitting points dispersed therein; a reflection surface provided on the opposite side of the phosphor layer from the first surface; and a substrate provided on the opposite side of the reflection surface from the phosphor layer, wherein the phosphor layer includes a first region on the first surface side and a second region located between the first region and the reflection surface, and a concentration of the fluorescence-emitting points in the second region is higher than a concentration of the fluorescence-emitting points in the first region.

2 . A light source device comprising:
a light-emitting element that emits excitation light to excite the fluorescence-emitting points; and the wavelength conversion element according to claim 1 .

3 . A projector comprising:
an illumination device that emits illumination light; a light modulator that modulates the illumination light in response to image information to thereby form image light; and a projection optical system that projects the image light, wherein the illumination device is the light source device according to claim 2 .

4 . A method for manufacturing a wavelength conversion element including
a substrate, a reflection surface provided on the substrate, and a phosphor layer provided on the reflection surface and including fluorescence-emitting points dispersed therein, the method comprising: forming, above the reflection surface, a second phosphor film having a second fluorescence-emitting point concentration; and forming, above the second phosphor film, a first phosphor film having a first fluorescence-emitting point concentration lower than the second fluorescence-emitting point concentration.

Assignees

• Seiko Epson Corp

Inventors

• Nojima Shigeo

Classifications

• G03B21/16

  Cooling; Preventing overheating · CPC title

• G03B21/2013

  Plural light sources · CPC title

• G03B21/2066

  Reflectors in illumination beam (in projection beam G03B21/28) · CPC title

• G03B21/006

  using LCD's · CPC title

• G03B21/204 Primary

  using secondary light emission, e.g. luminescence or fluorescence (using different colours G03B33/00; if related to video signals H04N9/3197) · CPC title