Projector

Abstract

A projector includes: a first solid-state light source device which includes a first solid-state light source emitting main excitation light, and a fluorescent layer converting main excitation light to light including a first color light component and a second color light component different from the first color light component, and emitting converted light; a second solid-state light source device which includes a second solid-state light source emitting a third color light component different from the first color light component and the second color light component; a light modulation device modulating the first color light component, the second color light component, and the third color light component in accordance with image information; a projection optical system projecting the modulated light components from the light modulation device as a projection image; and a third solid-state light source device which includes a third solid-state light source emitting auxiliary excitation light, wherein the fluorescent layer is configured such that auxiliary excitation light is input thereto in a direction different from a direction in which main excitation light is input, and the fluorescent layer is configured to convert auxiliary excitation light to light including the first color light component and the second color light component, and to emit converted light.

What is claimed is: 
     
       1. A projector comprising:
 a first solid-state light source device which includes a first solid-state light source emitting main excitation light, and a fluorescent layer converting the main excitation light to light including a first color light component and a second color light component different from the first color light component, and emitting converted light; 
 a second solid-state light source device which includes a second solid-state light source emitting a third color light component different from the first color light component and the second color light component; 
 a light modulation device modulating the first color light component, the second color light component, and the third color light component in accordance with image information; 
 a projection optical system projecting the modulated light components from the light modulation device as a projection image; and 
 a third solid-state light source device which includes a third solid-state light source emitting auxiliary excitation light, 
 wherein the fluorescent layer is configured such that the auxiliary excitation light is input thereto in a direction different from a direction in which the main excitation light is input, and the fluorescent layer is configured to convert the auxiliary excitation light to light including the first color light component and the second color light component, and to emit the converted light. 
 
     
     
       2. The projector according to  claim 1 , further comprising:
 a first collimation optical system parallelizing light emitted from the first solid-state light source device; 
 a second collimation optical system parallelizing light emitted from the second solid-state light source device; 
 a third collimation optical system having an optical axis orthogonal to an optical axis of the first collimation optical system and parallelizing the auxiliary excitation light emitted from the third solid-state light source device; and 
 an auxiliary excitation light reflection optical element disposed in a region including an intersection between the optical axis of the first collimation optical system and the optical axis of the third collimation optical system, 
 wherein the auxiliary excitation light reflection optical element directly transmits light which is converted by the fluorescent layer and emitted from the fluorescent layer, and reflects the auxiliary excitation light from the third solid-state light source device to input the auxiliary excitation light to the fluorescent layer in an opposite direction to a direction in which the main excitation light from the first solid-state light source is input. 
 
     
     
       3. The projector according to  claim 2 , further comprising:
 a reflection-type polarizing plate located at the back of the first collimation optical system to directly transmit one polarized component from among polarized components included in light emitted from the first solid-state light source device and to reflect another polarized component toward the fluorescent layer. 
 
     
     
       4. The projector according to  claim 2 ,
 wherein the main excitation light and the auxiliary excitation light are blue light components, 
 the first color light component is a red light component, 
 the second color light component is a green light component, 
 the third color light component is a blue light component, and 
 the auxiliary excitation light reflection optical element is a mirror which reflects the blue color light component and transmits the red color light component, the green color light component and a yellow color light component, the yellow color light component included in light from the first solid-state light source device, and the mirror has a wavelength selective transmission film. 
 
     
     
       5. The projector according to  claim 2 ,
 wherein the auxiliary excitation light reflection optical element is a dichroic mirror to remove the main excitation light from light from the first solid-state light source device. 
 
     
     
       6. The projector according to  claim 1 ,
 wherein the main excitation light and the auxiliary excitation light are blue light components, 
 the first color light component is a red light component, 
 the second color light component is a green light component, and 
 the third color light component is a blue light component. 
 
     
     
       7. The projector according to  claim 6 ,
 wherein the first solid-state light source, the second solid-state light source, and the third solid-state light source have the same temperature characteristic. 
 
     
     
       8. The projector according to  claim 6 ,
 wherein the fluorescent layer is formed of a layer containing a YAG-based fluorescent material, a silicate-based fluorescent material, or a TAG-based fluorescent material. 
 
     
     
       9. The projector according to  claim 1 ,
 wherein the main excitation light and the auxiliary excitation light are ultraviolet light, 
 the first color light component is a red light component, 
 the second color light component is a green light component, and 
 the third color light component is a blue light component. 
 
     
     
       10. The projector according to  claim 1 ,
 wherein the main excitation light is one of a blue light component and ultraviolet light, 
 the auxiliary excitation light is the other one of the blue light component and the ultraviolet light, 
 the first color light component is a red light component, 
 the second color light component is a green light component, and 
 the third color light component is a blue light component. 
 
     
     
       11. The projector according to  claim 1 ,
 wherein a function is provided to remove a yellow light component from light from the first solid-state light source device. 
 
     
     
       12. The projector according to  claim 1 ,
 wherein a function is provided to remove the main excitation light from light from the first solid-state light source device. 
 
     
     
       13. A projector comprising:
 a first solid-state light source device which includes a first solid-state light source emitting main excitation light, and a fluorescent layer converting the main excitation light to light including a first color light component and a second color light component different from the first color light component, and emitting converted light;   a second solid-state light source device which includes a second solid-state light source emitting a third color light component different from the first color light component and the second color light component;   a light modulation device modulating the first color light component, the second color light component, and the third color light component in accordance with image information;   a projection optical system projecting the modulated light components from the light modulation device as a projection image; and   a third solid-state light source device which includes a third solid-state light source emitting auxiliary excitation light,   wherein the fluorescent layer is configured to convert the auxiliary excitation light to light including the first color light component and the second color light component, and to emit the converted light.   
     
     
       14. The projector according to claim 13, further comprising:
 a first collimation optical system parallelizing light emitted from the first solid-state light source device;   a second collimation optical system parallelizing light emitted from the second solid-state light source device;   a third collimation optical system having an optical axis orthogonal to an optical axis of the first collimation optical system and parallelizing the auxiliary excitation light emitted from the third solid-state light source device; and   an auxiliary excitation light reflection optical element disposed in a region including an intersection between the optical axis of the first collimation optical system and the optical axis of the third collimation optical system,   wherein the auxiliary excitation light reflection optical element directly transmits light which is converted by the fluorescent layer and emitted from the fluorescent layer, and reflects the auxiliary excitation light from the third solid-state light source device to input the auxiliary excitation light to the fluorescent layer in an opposite direction to a direction in which the main excitation light from the first solid-state light source is input.   
     
     
       15. The projector according to claim 14, further comprising:
 a reflection-type polarizing plate located downstream of the first collimation optical system, the reflection-type polarizing plate transmitting a first polarized component of light emitted from the first solid-state light source device and reflecting a second polarized component of light emitted from the first solid-state light source toward the fluorescent layer, the second polarized component different from the first polarized component.   
     
     
       16. The projector according to claim 13,
 wherein the main excitation light is one of blue light and ultraviolet light,   the auxiliary excitation light is one of blue light and ultraviolet light,   the first color light component is a red light component,   the second color light component is a green light component, and   the third color light component is a blue light component.   
     
     
       17. The projector according to claim 16,
 wherein the first solid-state light source, the second solid-state light source, and the third solid-state light source have a same temperature characteristic.   
     
     
       18. The projector according to claim 13,
 wherein a function is provided to remove a yellow light component from light from the first solid-state light source device.   
     
     
       19. The projector according to claim 13,
 wherein a function is provided to remove the main excitation light from light from the first solid-state light source device.