Projector

Abstract

A liquid crystal panel unit is attached to a light incident surface of a prism composite. The liquid crystal panel unit includes a panel frame plate holding a liquid crystal panel, and a fixation frame plate glued and fixed to the light incident surface. The panel frame plate is fastened to the fixation frame plate by screws through an intermediate frame plate. By using wedges, the position of the panel frame plate with respect to the light incident surface is adjusted. This allows the liquid crystal panel to be reliably positioned and fixed so that the deviation amount in pixel matching is minimized and the focus adjustment can be accomplished correctly.

What is claimed is:  
     
       1. A projection type display device of the type which separates a beam from a light source into beams of a plurality of colors, modulates each color beam through a light valve in accordance with image information, synthesizes the modulated color beams by light synthesizing, and projects the synthesized beam onto a projection surface through a projecting mechanism in an enlarged state, the projection type display device comprising: 
       a light synthesizing prism having a light incident surface that synthesizes the modulated color beams; 
       a fixation frame plate fixed to a  the light incident surface of a  the light synthesizing means  prism;  
       a light valve frame plate for holding a light valve;  
       fixing mechanism for detachably fixing the light valve frame plate to the fixation frame plate; and  
       positioning mechanism positioned proximate to the fixation frame plate for positioning the light valve.  
     
     
       2. A projection type display device according to  claim 1 , wherein at least one of the light valve frame plate and the fixation frame plate comprises a peripheral wall covering the periphery of the light valve. 
     
     
       3. A projection type display device according to  claim 1 , wherein the positioning mechanism comprises an adjusting member for adjusting the position of the light valve. 
     
     
       4. A projection type display device according to  claim 3 , wherein the light valve frame plate comprises an adjusting member guiding mechanism. 
     
     
       5. A projection type display device according to  claim 3 , wherein the adjusting member comprises at least one engagement section utilized when chucking the adjusting member. 
     
     
       6. A projection type display device according to  claim 1 , wherein the positioning mechanism is provided proximate a center of opposite side portions of the light valve frame plate. 
     
     
       7. A projection type display device according to  claim 1 , wherein at least one of the fixation frame plate and the light valve frame plate comprises an engagement section for chucking the plate. 
     
     
       8. A projection type display device of the type which separates a beam from a light source into beams of a plurality of colors, modulates each color beam through a light valve in accordance with image information, synthesizes the modulated color beams by light synthesizing, and projects the synthesized beam onto a projection surface through a projection mechanism in an enlarged state, the projection type display device comprising: 
       a light synthesizing prism having a light incident surface that synthesizes the modulated color beams; 
       a fixation frame plate fixed to a  the light incident surface of a  the light synthesizing means  prism;  
       a light valve frame plate for holding a light valve;  
       an intermediate frame plate placed between the fixation frame plate and the light valve frame plate;  
       a fixing mechanism for detachably fixing the light valve frame plate and the intermediate frame plate to the fixation frame plate; and  
       a positioning mechanism positioned proximate to the fixation  intermediate frame plate for positioning the light valve.  
     
     
       9. A projection type display device according to  claim 8 , further comprising temporal fixing mechanism for temporarily fixing the intermediate frame plate and the light valve frame plate. 
     
     
       10. A projection type display device according to  claim 9 , wherein the temporal fixing mechanism comprises an engagement protrusion formed on one of the intermediate frame plate and the panel frame plate and an engagement hole formed in the other plate. 
     
     
       11. A projection type display device according to  claim 10 , wherein the engagement protrusion inserted into the engagement hole is fixed thereto. 
     
     
       12. A projection type display device according to  claim 8 , wherein the positioning mechanism comprises adjusting parts for adjusting the position of the light valve. 
     
     
       13. A projection type display device according to  claim 12 , wherein the light valve frame plate further comprises an adjusting member guiding mechanism. 
     
     
       14. A projection type display device according to  claim 12 , wherein the adjusting parts comprises at least one engagement section utilized when chucking the adjusting member. 
     
     
       15. A projection type display device according to  claim 8 , wherein the positioning mechanism is located proximate a center of opposite side portions of the light valve frame plate. 
     
     
       16. A projection type display device according to  claim 1 , wherein the light valve is held between the light valve frame plate and the fixation frame plate. 
     
     
       17. A projection type display device according to  claim 1 , wherein the light valve is a liquid crystal light valve. 
     
     
       18. A projection type display device according to  claim 8 , wherein the light valve is a liquid crystal light valve. 
     
     
       19. A projector which separates a beam from a light source into a plurality of color beams, modulates each color beam through a light valve in accordance with image information, synthesizes the modulated color beams by light synthesizing, and projects the synthesized beam onto a projection surface through a projection mechanism in an enlarged state, the projector comprising: 
       
         a light synthesizing prism having a light incident surface that synthesizes the modulated color beams;  
       
       
         a fixation frame plate fixed to the light incident surface of the light synthesizing prism;  
       
       
         a light valve frame plate for holding the light valve;  
       
       
         a fixing mechanism for detachably fixing the light valve frame plate to the fixation frame plate;  
       
       
         a positioning mechanism positioned proximate to the fixation frame plate for positioning the light valve;  
       
       
         a power supply;  
       
       
         an input/output interface circuit,  
       
       
         a video signal processing circuit;  
       
       
         a control circuit for driving and controlling the projector; and  
       
         an outer casing for housing the light source, the light valve, the light synthesizing prism, the fixation frame plate, the light valve frame plate, the fixing mechanism, the positioning mechanism, the power supply, the input - output interface circuit, the video signal processing circuit, and the control circuit.   
     
     
       20. A projector according to  claim 19 , wherein at least one of the light valve frame plate and the fixation frame plate comprises a peripheral wall covering the periphery of the light valve. 
     
     
       21. A projector according to  claim 19 , wherein the positioning mechanism comprises an adjusting member for adjusting the position of the light valve. 
     
     
       22. A projector according to  claim 21 , wherein the light valve frame plate comprises an adjusting member guiding mechanism. 
     
     
       23. A projector according to  claim 21 , wherein the adjusting member comprises at least one engagement section utilized when chucking the adjusting member. 
     
     
       24. A projector according to  claim 19 , wherein the positioning mechanism is provided proximate a center of opposite side portions of the light valve frame plate. 
     
     
       25. A projector according to  claim 19 , wherein at least one of the fixation frame plate and the light valve frame plate comprises an engagement section for chucking the plate. 
     
     
       26. A projector according to  claim 19 , wherein the light valve is held between the light valve frame plate and the fixation frame plate. 
     
     
       27. A projector according to  claim 19 , wherein the light valve is a liquid crystal light valve. 
     
     
       28. A projector which separates a beam from a light source into a plurality of color beams, modulates each color beam through a light valve in accordance with image information, synthesizes the modulated color beams by light synthesizing, and projects the synthesized beam onto a projection surface through a projecting mechanism in an enlarged state, the projector comprising: 
       
         a light synthesizing prism having a light incident surface that synthesizes the modulated color beams;  
       
       
         a fixation frame plate fixed to the light incident surface of the light synthesizing prism;  
       
       
         a light valve frame plate for holding the light valve;  
       
       
         an intermediate frame plate between the fixation frame plate and the light valve frame plate;  
       
       
         a fixing mechanism for detachably fixing the light valve frame plate to the fixation frame plate;  
       
       
         a positioning mechanism positioned proximate to the intermediate frame plate for positioning the light valve;  
       
       
         a power supply;  
       
       
         an input/output interface circuit;  
       
       
         a video signal processing circuit;  
       
       
         a control circuit for driving and controlling the projector; and  
       
         an outer casing for housing the light source, the light valve, the light synthesizing prism, the fixation frame plate, the light valve frame plate, the intermediate frame plate, the fixing mechanism, the positioning mechanism, the power supply, the input - output interface circuit, the video signal processing circuit, and the control circuit.   
     
     
       29. A projector according to  claim 28 , further comprising a temporal fixing mechanism for temporarily fixing the intermediate frame plate and the light valve frame plate. 
     
     
       30. A projector according to  claim 29 , wherein the temporal fixing mechanism comprises an engagement protrusion formed on one of the intermediate frame plate, and the panel frame plate and an engagement hole formed in the other plate. 
     
     
       31. A projector according to  claim 30 , wherein the engagement protrusion inserted into the engagement hole is fixed thereto. 
     
     
       32. A projector according to  claim 28 , wherein the positioning mechanism comprises adjusting parts for adjusting the position of the light valve. 
     
     
       33. A projector according to  claim 32 , wherein the light valve frame plate further comprises an adjusting member guiding mechanism. 
     
     
       34. A projector according to  claim 32 , wherein the adjusting parts comprise at least one engagement section utilized when chucking the adjusting member. 
     
     
       35. A projector according to  claim 28 , wherein the positioning mechanism is located proximate a center of opposite side portions of the light valve frame plate. 
     
     
       36. A projector according to  claim 28 , wherein the light valve is a liquid crystal light valve.