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US 8,616,708 B2Granted
Fluorescent wheel, light source device and projector
AssigneeCasio Computer Co., Ltd.
InventorHiroki Masuda
Life of this patent
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Abstract
A fluorescent wheel comprising a base with a reflective surface and a flat bottom surface, and a fluorescent layer disposed on the reflective surface of the base such that the reflective surface of the base directs, outward from the wheel, fluorescence emitted from the fluorescent layer due to its excitation by exciting light. The reflective surface of the base has an array of minute reflective structures formed thereon so as to reflect, outward from the reflective surface, fluorescence emitted substantially parallel to the flat bottom surface of the base from the fluorescent layer.
Claims22
A fluorescent substrate comprising:
- a base having a reflective surface;
- and
- a fluorescent layer formed by disposing a fluorescent substance on the reflective surface of the base;
- wherein fluorescence emitted from the fluorescent substance due to its excitation by exciting light is emitted from a side of the base on which the fluorescent substance is disposed;
- wherein the reflective surface of the base has a minute reflective structure formed thereon such that fluorescence emitted in a flat direction of the base from the fluorescent layer is emitted outward, in a direction intersecting the flat direction, from the side of the base on which the fluorescent substance is disposed;
- wherein the minute reflective structure comprises a flat section and a plurality of projections projecting from the flat section;
- wherein the base is a fluorescent wheel which is in the form of a disc, at a predetermined position on which a ring-like groove is formed, wherein the minute reflective structure is formed on a bottom face of the ring-like groove, and wherein the fluorescent layer is deposited within the ring-like groove;
- and
- wherein a side surface of each of the projections is paraboloid-shaped.
6 more elements
A fluorescent substrate comprising:
- a base having a reflective surface;
- and
- a fluorescent layer formed by disposing a fluorescent substance on the reflective surface of the base;
- wherein fluorescence emitted from the fluorescent substance due to its excitation by exciting light is emitted from a side of the base on which the fluorescent substance is disposed;
- wherein the reflective surface of the base has a minute reflective structure formed thereon such that fluorescence emitted in a flat direction of the base from the fluorescent layer is emitted outward, in a direction intersecting the flat direction, from the side of the base on which the fluorescent substance is disposed;
- wherein the minute reflective structure comprises a flat section and a plurality of projections projecting from the flat section;
- and
- wherein a height of each projection in the minute reflective structure is equal in value to a thickness of the fluorescent layer from a bottom surface to a top surface of the fluorescent layer.
5 more elements
A projector comprising:
- a display element;
- a light source device,
- a light source side optical system that guides light emitted from the light source device to the display element;
- a projection side optical system that projects projection light from the display element to a screen;
- and
- a projector controller;
- wherein the light source device comprises an exciting light source and a fluorescent substrate;
- and
- wherein the fluorescent substrate comprises:
- a base having a reflective surface;
- and
- a fluorescent layer formed by disposing a fluorescent substance on the reflective surface of the base;
- wherein fluorescence emitted from the fluorescent substance due to its excitation by exciting light is emitted from a side of the base on which the fluorescent substance is disposed;
- wherein the reflective surface of the base has a minute reflective structure formed thereon such that fluorescence emitted in a flat direction of the base from the fluorescent layer is emitted outward, in a direction intersecting the flat direction, from the side of the base on which the fluorescent substance is disposed;
- wherein the minute reflective structure comprises a flat section and a plurality of projections projecting from the flat section;
- and
- wherein a height of each projection in the minute reflective structure is smaller in value than a thickness of the fluorescent layer.
14 more elements
A fluorescent substrate comprising:
- a base having a reflective surface;
- and
- a fluorescent layer formed by disposing a fluorescent substance on the reflective surface of the base;
- wherein fluorescence emitted from the fluorescent substance due to its excitation by exciting light is emitted from a side of the base on which the fluorescent substance is disposed;
- wherein the reflective surface of the base has a minute reflective structure formed thereon such that fluorescence emitted in a flat direction of the base from the fluorescent layer is emitted outward, in a direction intersecting the flat direction, from the side of the base on which the fluorescent substance is disposed;
- wherein the minute reflective structure comprises a flat section and a plurality of projections projecting from the flat section;
- wherein the base is a fluorescent wheel which is in the form of a disc, at a predetermined position on which a ring-like groove is formed, wherein the minute reflective structure is formed on a bottom face of the ring-like groove, and wherein the fluorescent layer is deposited within the ring-like groove;
- and
- wherein each of the projections is a paraboloid of revolution.
6 more elements
Dependencies are inferred from the claim text.