Projector-use luminescent wheel and manufacturing method therefor, and projector-use light emitting device

Patent metadata

Field	Value
Publication number	US-2016377967-A1
Application number	US-201415101461-A
Country	US
Kind code	A1
Filing date	Dec 16, 2014
Priority date	Dec 27, 2013
Publication date	Dec 29, 2016
Grant date	—

Abstract

Provided is a luminescent wheel for a projector, which has a novel structure in which a phosphor layer is hard to break even if its thickness is reduced; a manufacturing method therefor; and a light emitting device for a projector. A luminescent wheel for a projector includes: a phosphor layer ( 11 ) which has a first principal surface ( 11 a ) and a second principal surface ( 11 b ) located on an opposite side to the first principal surface ( 11 a ) and is capable of being excited by the entry of excitation light to emit fluorescence; a first glass layer ( 12 ) provided on the first principal surface ( 11 a ) of the phosphor layer ( 11 ); and a second glass layer ( 13 ) provided on the second principal surface ( 11 b ) of the phosphor layer ( 11 ).

First claim

1 : A luminescent wheel for a projector comprising:
a phosphor layer which has a first principal surface and a second principal surface located on an opposite side to the first principal surface and is capable of being excited by the entry of excitation light to emit fluorescence; a first glass layer provided on the first principal surface of the phosphor layer; and a second glass layer provided on the second principal surface of the phosphor layer.

2 : The luminescent wheel for a projector according to claim 1 , wherein the phosphor layer has a thickness in a range of 30 to 200 μm.

3 : The luminescent wheel for a projector according to claim 1 , wherein each of the first glass layer and the second glass layer has a thickness in a range of 5 to 300 μm.

4 : The luminescent wheel for a projector according to claim 1 , wherein each of the first glass layer and the second glass layer has a thickness in a range of 10 to 150 μm.

5 : The luminescent wheel for a projector according to claim 1 , wherein the phosphor layer contains a glass matrix and a phosphor dispersed in the glass matrix.

6 : The luminescent wheel for a projector according to claim 5 , wherein glass constituting the first glass layer or the second glass layer has a coefficient of thermal expansion in a range of a coefficient of thermal expansion of glass constituting the glass matrix−50×10 −7 /° C. to a coefficient of thermal expansion of glass constituting the glass matrix+50×10 −7 /° C.

7 : The luminescent wheel for a projector according to claim 5 , wherein glass constituting the first glass layer or the second glass layer has a softening point higher than glass constituting the glass matrix.

8 : The luminescent wheel for a projector according to claim 1 , wherein the first glass layer and/or the second glass layer includes a chemically strengthened layer.

9 : The luminescent wheel for a projector according to claim 1 , wherein the phosphor layer has an annular shape.

10 : The luminescent wheel for a projector according to claim 1 , wherein a reflective layer formed of a metal film or a dielectric multi-layer is provided on the first glass layer.

11 : The luminescent wheel for a projector according to claim 1 , wherein a first wavelength-selective layer is provided on a side of the phosphor layer where the excitation light enters, and the first wavelength-selective layer is configured to transmit the excitation light and reflect the fluorescence.

12 : The luminescent wheel for a projector according to claim 1 , wherein a second wavelength-selective layer is provided on a side of the phosphor layer where the fluorescence exits, and the second wavelength-selective layer is configured to transmit the fluorescence and reflect the excitation light.

13 : The luminescent wheel for a projector according to claim 1 , wherein an antireflection film is provided on a side of the phosphor layer where the fluorescence exits.

14 : A method for manufacturing the luminescent wheel for a projector according to claim 1 , the method comprising the steps of:
producing a laminate in which a second green sheet to be a phosphor layer is laid on top of a first green sheet to be a first glass layer and a third green sheet to be a second glass layer is laid on top of the second green sheet; and firing the laminate to form the first green sheet, the second green sheet, and the third green sheet into the first glass layer, the phosphor layer, and the second glass layer, respectively.

15 : The method for manufacturing the luminescent wheel for a projector according to claim 14 , wherein the laminate has a wheel shape.

16 : The method for manufacturing the luminescent wheel for a projector according to claim 14 , further comprising the step of processing the fired laminate into a wheel shape.

17 : The method for manufacturing the luminescent wheel for a projector according to claim 14 , further comprising the step of chemically strengthening the fired laminate.

18 : A light emitting device for a projector comprising:
the luminescent wheel for a projector according to claim 1 ; and a light source capable of irradiating the phosphor layer of the luminescent wheel with the excitation light.

Assignees

• Nippon Electric Glass Co

Inventors

• Ando Tamio
• Furuyama Tadahito
• Fujita Shunsuke

Classifications

• B32B2307/732

  Dimensional properties · CPC title

• B32B37/06

  characterised by the heating method · CPC title

• B32B38/0012

  Mechanical treatment, e.g. roughening, deforming, stretching · CPC title

• B32B2307/422

  Luminescent, fluorescent, phosphorescent · CPC title

• B32B9/005

  comprising one layer of ceramic material, e.g. porcelain, ceramic tile (layered products with at least two ceramic layers composed mainly of ceramic B32B18/00) · CPC title