Light source apparatus and image projection apparatus

Abstract

A light source apparatus includes a light source unit that includes plural sets of a laser and a coupling lens corresponding to the laser, which are circumferentially provided to form a circle; and a reflecting unit placed within the circle and provided with plural reflecting surfaces corresponding to the lasers of the plural sets of the light source unit to be formed in a cone shape, the light irradiated from each of the lasers being injected into the corresponding reflecting surface via the corresponding coupling lens.

What is claimed is: 
     
       1. A light source apparatus comprising:
 a light source unit that includes plural sets of a laser and a coupling lens corresponding to the laser, which are circumferentially provided to form a circle;   a reflecting unit placed within the circle and provided with plural reflecting surfaces corresponding to the lasers of the plural sets of the light source unit to be formed in a cone shape, the light irradiated from each of the lasers being injected into the corresponding reflecting surface via the corresponding coupling lens;   a support member on which the lasers and the coupling lenses of the plural sets are fixed; and   a radiation member provided at a surface of the support member opposite to the side where the light paths of the lights irradiated from the lasers of the sets are formed, and including a flat surface formed at a center portion, a sloped guide surface which is provided at the outer side of the flat surface to be concaved downward such as to become deeper the closer the sloped guide surface becomes to an outer periphery of the radiation member from the flat surface, and plural fins provided to rest on the concaved sloped guide surface.   
     
     
       2. The light source apparatus according to  claim 1 , further comprising:
 a plurality of the light source units,   wherein the plurality of light source units and the reflecting unit are fixed on the support member such that the lights irradiated from the lasers of the plurality of light source units are injected into the respective reflecting surfaces of the reflecting unit.   
     
     
       3. The light source apparatus according to  claim 2 ,
 wherein the sets of the laser and the coupling lens of one of the light source units and the sets of the laser and the coupling lens of another of the light source units are alternately positioned in a planar view.   
     
     
       4. The light source apparatus according to  claim 2 ,
 wherein the plurality of light source units are positioned on different levels, and   wherein the sets of the laser and the coupling lens of the plurality of light source units are arranged around the circumference of the same circle in a planar view.   
     
     
       5. The light source apparatus according to  claim 1 ,
 wherein the lasers and the coupling lenses of the plural sets are positioned such that optical axes of the irradiated lights from the lasers are directed in a thickness direction of the support member.   
     
     
       6. The light source apparatus according to  claim 5 , further comprising:
 plural reflecting mirrors provided to change the optical paths of the lights irradiated from the respective lasers and passed through the coupling lenses toward the respective reflecting surfaces of the reflecting unit.   
     
     
       7. An image projection apparatus, comprising:
 the light source apparatus according to  claim 1 ;   an amount of light equation unit that equates the amount of the lights reflected by the reflecting surfaces of the reflecting unit of the light source apparatus;   a light transmission optical system that transmits the lights output from the amount of light equation unit to an image forming panel which forms an image; and   a projection optical system that projects an enlarged image of the image formed on the image forming panel.   
     
     
       8. The image projection apparatus according to  claim 7 , further comprising:
 a plurality of the light source apparatuses,   wherein the lights irradiated from the light source units and reflected by the respective reflecting surfaces of the reflecting units of the light source apparatuses are injected into the amount of light equation unit.   
     
     
       9. The image projection apparatus according to  claim 7 , further comprising:
 a diffusion unit that diffuses the lights.   
     
     
       10. An image projection apparatus, comprising:
 a first light source unit emitting first light in a first direction;   a second light source unit emitting second light in a second direction that is opposite the first direction;   a first reflecting part reflecting the first light from the first light source unit;   a second reflecting part reflecting the second light from the second light source unit;   a synthesizing part;   a third reflecting part disposed on an optical path between the first reflecting part and the synthesizing part;   a fourth reflecting part disposed on an optical path between the second reflecting part and the synthesizing part, the synthesizing part synthesizing the first light reflected by the first reflecting part and the third reflecting part and the second light reflected by the second reflecting part and the fourth reflecting part; and   a projector lens projecting the synthesized light synthesized by the synthesizing part,   wherein the first light source unit includes a first light source that is located at one side of a plane passing through a light axis of the projector lens, the first reflecting part, the second reflecting part, the third reflecting part, and the fourth reflecting part and that irradiates the first light in a direction perpendicular to the plane, and   wherein the second light source unit includes a second light source that is located at the other side of the plane and that irradiates the second light in a direction perpendicular to the plane.   
     
     
       11. The image projection apparatus according to claim 10, further comprising:
 a lens condensing the first light from the first light source of the first light source unit to the first reflecting part.   
     
     
       12. The image projection apparatus according to claim 11,
 wherein the light axis of the projector lens is located between the first reflecting part and the second reflecting part.   
     
     
       13. The image projection apparatus according to claim 11,
 wherein the synthesizing part synthesizes only the first light reflected by the first reflecting part and the third reflecting part and the second light reflected by the second reflecting part and the fourth reflecting part.   
     
     
       14. The image projection apparatus according to claim 11,
 wherein the synthesizing part synthesizes red, blue and green lights.   
     
     
       15. The image projection apparatus according to claim 11, further comprising:
 a heat sink cooling the first light source unit.   
     
     
       16. The image projection apparatus according to claim 11,
 wherein the first light source of the first light source unit is fixed to a support member made of aluminum.   
     
     
       17. The image projection apparatus according to claim 10,
 wherein the light axis of the projector lens is located between the first reflecting part and the second reflecting part.   
     
     
       18. The image projection apparatus according to claim 17,
 wherein the synthesizing part synthesizes only the first light reflected by the first reflecting part and the third reflecting part and the second light reflected by the second reflecting part and the fourth reflecting part.   
     
     
       19. The image projection apparatus according to claim 18,
 wherein the synthesizing part synthesizes red, blue and green lights.   
     
     
       20. The image projection apparatus according to claim 18, further comprising:
 a diffusion unit that diffuses the first light from the first light source unit; and   a motor that rotates the diffusion unit.   
     
     
       21. The image projection apparatus according to claim 18, further comprising:
 a heat sink cooling the first light source unit.   
     
     
       22. The image projection apparatus according to claim 18,
 wherein each of the first light source unit and the second light source unit includes a plurality of light sources,   wherein the plurality of light sources included in the first light source unit are fixed at a first support member, and   wherein the plurality of light sources included by the second light source unit are fixed at a second support member.   
     
     
       23. The image projection apparatus according to claim 18,
 wherein the first light source of the first light source unit is fixed to a support member made of aluminum.   
     
     
       24. The image projection apparatus according to claim 10,
 wherein the first reflecting part and the second reflecting part are not disposed on the light axis of the projector lens.   
     
     
       25. The image projection apparatus according to claim 10, wherein
 the third reflecting part perpendicularly reflects the first light reflected by the first reflecting part; and   the fourth reflecting part perpendicularly reflects the second light reflected by the second reflecting part.