Light source device and projection type display apparatus employing same light source device
View Patent ↗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.
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.