Light source device and projection type display apparatus employing same light source device

Patent metadata

Field	Value
Publication number	US-9255691-B2
Application number	US-201313867254-A
Country	US
Kind code	B2
Filing date	Apr 22, 2013
Priority date	Apr 26, 2012
Publication date	Feb 9, 2016
Grant date	Feb 9, 2016

Abstract

A light source device and a projection type display apparatus include: an excitation light source; and a fluorescence light-emitting plate including a fluorescence light-emitting section arranged opposite to the excitation light source and a reflection section containing titanium oxide located on the opposite side of the excitation light source as viewed from the side of the fluorescence light-emitting section and arranged such as to be joined to the fluorescence light-emitting section. Then, excitation light from the excitation light source is projected onto the fluorescence light-emitting section so that fluorescence emission light is emitted from the fluorescence light-emitting section and reflected fluorescence light is emitted from the reflection section.

First claim

The invention claimed is:

1. A light source device comprising:
an excitation light source; and
a fluorescence light-emitting plate including a fluorescence light-emitting section arranged opposite to said excitation light source and a reflection section containing titanium oxide located on the opposite side of said excitation light source as viewed from the side of the fluorescence light-emitting section and arranged such as to be joined to the fluorescence light-emitting section,
wherein said reflection section comprises a reflection layer formed on a substrate and the reflection layer comprises titanium oxide and a binder,
said fluorescence light-emitting section comprises a fluorescence light-emitting material and a binder,
the binder of said reflection layer and the binder of said fluorescence light-emitting section are an organic binder or an inorganic binder, and
in the binder of said reflection layer and the binder of said fluorescence light-emitting section, a refractive index difference is 0.1 or smaller.

2. The light source device according to claim 1 , wherein a thickness of said fluorescence light-emitting section is 50 μm to 400 μm.

3. The light source device according to claim 1 , wherein a thickness of said fluorescence light-emitting section is 200 μm to 300 μm.

4. The light source device according to claim 1 , wherein a thickness of said reflection section is 10 μm to 350 μm.

5. The light source device according to claim 1 , wherein a thickness of said reflection section is 10 μm to 100 μm.

6. The light source device according to claim 1 , wherein
said reflection section is constructed from a plate-shaped body composed of titanium oxide or a plate-shaped body containing titanium oxide.

7. The light source device according to claim 1 , wherein the titanium oxide in said reflection section has a rutile type crystal structure.

8. The light source device according to claim 1 , wherein a revolution driving section is provided for revolving said fluorescence light-emitting plate.

9. The light source device according to claim 8 , wherein
said substrate has a disc shape and said reflection layer is formed in a ring shape.

10. The light source device according to claim 1 , wherein
said excitation light source is a blue laser and said fluorescence light-emitting section is constructed from a green fluorescence light-emitting section or a red fluorescence light-emitting section.

11. The light source device according to claim 1 , wherein
said excitation light source is an ultraviolet range laser and said fluorescence light-emitting section is constructed from a blue fluorescence light-emitting section, a green fluorescence light-emitting section, or a red fluorescence light-emitting section.

12. A projection type display apparatus comprising:
a light source device according to claim 1 ;
an image display device for forming an image corresponding to a video signal; and
an optical device for guiding light from said light source device to said image display device so as to project onto a screen an image emitted from said image display device.

Assignees

• Panasonic Corp
• Panasonic Ip Man Co Ltd

Inventors

• Motoya Atsushi
• Katsumata Yohei
• Fushimi Yoshimasa

Classifications

• 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

• G03B33/12

  using beam-splitting or beam-combining systems, e.g. dichroic mirrors · CPC title

• F21V9/08 Primary

  for producing coloured light, e.g. monochromatic; for reducing intensity of light (with provision for controlling the colour F21V9/40) · CPC title