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

• US 9,255,691 B2
• Filed: 04/22/2013
• Issued: 02/09/2016
• Est. Priority Date: 04/26/2012
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: Motoya, Atsushi, Fushimi, Yoshimasa, Katsumata, Yohei
• Primary Examiner(s): Dowling, William C
• Assistant Examiner(s): HOWARD, RYAN D
• Application Number:
  US13/867,254
• Publication Number:
  US 20130286359A1
• Time in Patent Office: 1,023 Days
• US Class Current: 1/1
• CPC Class Codes: F21V 9/08 for producing coloured light, e.g. monochromatic; for reducing intensity of light with provision for controlling the colour F21V9/40
• CPC Class Codes: G03B 21/204 using secondary light emission, e.g. luminescence or fluorescence using different colours G03B33/00; if related to video signals H04N9/3197
• CPC Class Codes: G03B 33/12 using beam-splitting or beam-combining systems, e.g. dichroic mirrors

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.

Claims

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 μ

m to 400 μ

m.

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

m to 300 μ

m.

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

m to 350 μ

m.

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

m to 100 μ

m.

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.