JP2012068647A5 - - Google Patents

Description

In the past, projectors using a high-intensity discharge lamp as the light source have been the mainstream. However, in recent years, there have been developments and proposals using light-emitting diodes, laser diodes, or semiconductor light-emitting elements such as organic EL as the light source. A lot has been done.

When a laser diode is used as a light source in the proposals of Patent Document 1 to Patent Document 3, the light emitted from the laser diode is not directly emitted to the outside in a state where the phosphor is excited, but heat or aging deterioration occurs. When the phosphor is dropped due to the above, there is a possibility that the light emitted from the laser diode is directly emitted to the outside. In order to solve this problem, there is an electrical control method in which a device for detecting the dropping of a phosphor or the like is arranged in the light source device, and the light emission of the light source is immediately stopped when the dropping is detected. However, in the electric control, there is a possibility that some time lag occurs.

A light source device of the present invention, phosphor emitting a blue laser light source that emits laser light in a blue wavelength range, the light emitted from the blue laser light source so as to be positioned on the optical axis of the blue laser light source as excitation light A circular substrate as a light-emitting wheel that is laid as an annular irradiation region provided in a circumferential direction and is driven to rotate , and the substrate is formed by a member having high thermal conductivity, and as a diffusion layer, A reflection layer having irregularities is formed on the entire surface on the side facing the blue laser light source. On the reflection layer, light in the red wavelength region and green are excited using laser light emitted from the blue laser light source as excitation light. A phosphor layer that emits light in the wavelength range in the direction of the light source, each of which is composed of a red region and a green region, is laid, and an opening is formed in a part of the substrate so as to seal the opening Front to surface A light transmissive plate having fine irregularities serving as a diffusion layer is disposed, and the opening diffuses and transmits the blue laser light emitted from the blue laser light source, and between the substrate and the blue laser light source. Is characterized in that a dichroic mirror that transmits light emitted from the blue laser light source and reflects light emitted from the phosphor layer is disposed .

In the light source device of the present invention, the reflective layer is formed by mirror processing by forming fine irregularities by an etching method and depositing silver on the fine irregularities.
Further, the translucent plate is characterized in that fine irregularities are formed on the surface by sandblasting.
Further, concave convex of the reflective layer to the light source unit of the present invention is characterized in that fine irregularities of 10μm to 100μm intervals.

The projector of the present invention includes a light source device, a light guide device, a display element, a projection-side optical system, and a projector control unit. The light source device is a light source device as described above, and the light emission Projection is performed by emitting light in a predetermined wavelength region by controlling the rotation of the wheel .

Claims (5)

A blue laser light source for irradiating laser light in a blue wavelength range ;
Emitting wheel phosphor layer that emits light emitted from the blue laser light source as excitation light is laid as an annular illumination region provided in the circumferential direction is rotatably driven so as to be positioned on the optical axis of the blue laser light source As a circular substrate ,
With
The substrate is formed of a member having high thermal conductivity, and as a diffusion layer, a reflective layer having irregularities is formed on the entire surface on the side facing the blue laser light source,
On the reflective layer, fluorescent light composed of a red region and a green region, respectively, emits light in the red wavelength region and light in the green wavelength region in the light source direction using the laser light emitted from the blue laser light source as excitation light. As the body layer is laid,
An opening is formed in a part of the substrate, and a light-transmitting plate having fine irregularities to be the diffusion layer is disposed on the surface so as to seal the opening, and the opening is irradiated from the blue laser light source. The blue laser light to be diffused and transmitted,
A dichroic mirror that transmits light emitted from the blue laser light source and reflects light emitted from the phosphor layer is disposed between the substrate and the blue laser light source. . 2. The light source device according to claim 1, wherein the reflective layer is formed by mirror processing by forming fine irregularities by an etching method, and depositing silver on the fine irregularities . The light source device according to claim 1 , wherein the translucent plate has fine irregularities formed on a surface thereof by sandblasting . 4. The light source device according to claim 1 , wherein the unevenness of the reflective layer is a fine unevenness having an interval of 10 μm to 100 μm . A light source device, a light guide device, a display element, a projection side optical system, and a projector control means,
Projector light source device is a light source device according to any one of claims 1 to 4, which is emitting light of a predetermined wavelength region by controlling the rotation of the light-emitting wheel, and performing projection .