Light source device and projection display apparatus
View Patent ↗A light source device includes: a plurality of first laser light sources, a second laser light source, and a plurality of third laser light sources; a first polarization mirror that combines light from the plurality of first laser light sources and transmits light from the second laser light source; a dichroic mirror that combines the light from the plurality of first laser light sources and the light from the second laser light source; a second polarization mirror that combines light from the plurality of third laser light sources and transmits the light from the plurality of first laser light sources and the light from the second laser light source; a retardation plate that converts polarization of light from the second polarization mirror into circular polarization; and a filter element that reflects light from the retardation plate.
1. A light source device comprising:
a plurality of first laser light sources, a second laser light source, and a plurality of third laser light sources;
a first polarization mirror that combines light from the plurality of first laser light sources and transmits light from the second laser light source;
a dichroic mirror that combines the light from the plurality of first laser light sources and the light from the second laser light source;
a second polarization mirror that combines light from the plurality of third laser light sources and transmits the light from the plurality of first laser light sources and the light from the second laser light source;
a retardation plate that converts polarization of the light from the second polarization mirror into circular polarization; and
a filter element that reflects light from the retardation plate.
2. The light source device according to claim 1 , wherein the first polarization mirror and the first dichroic mirror are disposed to cross each other.
3. The light source device according to claim 1 , wherein the plurality of first laser light sources, the second laser light source, and the plurality of third laser light sources are green laser light sources, a blue laser light source, and red laser light sources, respectively.
4. The light source device according to claim 1 , wherein the plurality of first laser light sources, the second laser light source, and the plurality of third laser light sources are semiconductor lasers.
5. A projection display apparatus comprising:
a light source that is the light source device according to claim 1 ;
an illumination optical system that condenses light from the light source and illuminates a region to be illuminated;
an image forming element that forms an image according to an image signal using light from the illumination optical system; and
a projection lens that enlarges and projects the image formed by the image forming element.
6. A light source device comprising:
a plurality of first laser light sources, a second laser light source, and a third laser light source;
a first polarization mirror that combines light from the plurality of first laser light sources and transmits light from the second laser light source;
a second polarization mirror that reflects light from the third laser light source and transmits the light from the plurality of first laser light sources and the light from the second laser light source;
a retardation plate that converts polarization of the light from the second polarization mirror into circular polarization; and
a filter element that reflects light from the retardation plate.
7. The light source device according to claim 6 , further comprising;
a dichroic mirror that combines the light from the plurality of first laser light sources and the light from the second laser light source,
wherein the first polarization mirror and the first dichroic mirror are disposed to cross each other.
8. The light source device according to claim 6 , wherein the plurality of first laser light sources, the second laser light source, and the third laser light source are green laser light sources, a blue laser light source, and a red laser light source, respectively.
9. The light source device according to claim 6 , wherein the plurality of first laser light sources, the second laser light source, and the third laser light source are semiconductor lasers.
10. A projection display apparatus comprising:
a light source that is the light source device according to claim 6 ;
an illumination optical system that condenses light from the light source and illuminates a region to be illuminated;
an image forming element that forms an image according to an image signal using light from the illumination optical system; and
a projection lens that enlarges and projects the image formed by the image forming element.