Projector

Abstract

A projection-type display apparatus in accordance with the invention reduces the margin formed around the image forming range of the light valves, and forms a bright projected image. Emitted light from a light source lamp unit of a projection-type display apparatus illuminates liquid crystal light valves of each color via an integrator optical system. First and second lens plates of an integrator optical system that serves as a uniform illuminating optical system are disposed such that the attachment position thereof is capable of fine adjustment in a direction vertical to the optical axis. By performing fine adjustment of the attachment position of these, the forming position of the illumination range B can be adjusted to include the image forming range A of the liquid crystal light valves. Accordingly, there is no need to provide a wide margin around the image forming range A, taking shifting of the forming position of the illumination range B into consideration. Thus, efficient usage of the illumination light can be increased, thereby improving the brightness of the projected image.

1. A projector having an optical axis, comprising:
 a light source emitting light flux;  
 a modulating device for modulating the light flux emitted from said light source in accordance with image signals;  
 a projecting lens unit for performing enlarged projection of said light flux modulated by said modulating device upon a projection surface;  
 a first lens plate and a second lens plate, each of which include a plurality of lenses arrayed in matrix-form disposed in the an optical path between said light source and said modulating device;  
 wherein at least one of said first and second lens plates is arranged so that any attachment position thereof is adjustable in a direction intersecting the optical axis.  
 
     
     
       2. The projector according to  claim 1 , further including a reflecting device disposed in the optical path between said light source and said modulating device, said reflecting device arranged such that an angle of attachment relative to the incident optical axis is adjustable. 
     
     
       3. The projector according to  claim 1 , further including:
 a color separating optical system for separating light emitted from said second lens plate into light flux of each color;  
 a plurality of modulating devices for modulating said light flux of each color separated by said color separating optical system;  
 a color synthesizing system for synthesizing the light flux of each color modulated by said plurality of modulating devices; and  
 a reflecting device disposed in the optical path between said light source and at least one of said plurality of modulating devices, and arranged such that an angle of attachment relative to the incident optical axis is adjustable;  
 wherein the modulated light flux synthesized by said synthesizing system is projected on the projection surface via said color projecting lens unit.  
 
     
     
       4. The projector according to  claim 3 , wherein the attachment angle of said reflecting device positioned closest to said modulating device is adjustable. 
     
     
       5. The projector according to  claim 3 , wherein said modulating device is of a reflection type, and said color separating optical system and said color synthesizing optical system are incorporated into the same optical system. 
     
     
       6. A projector having an optical axis, comprising:
 a light source emitting light fluxes;  
 a first optical component for splitting the emitted light fluxes from said light source into a plurality of intermediate light fluxes, the intermediate light fluxes being focused at a position;  
 a second optical component disposed in proximity to the position at which said intermediate light fluxes are focused;  
 a modulating device for modulating the light flux emitted from said second optical component; and  
 a projecting lens unit for performing enlarged projection of said light flux modulated by said modulating device upon a projection surface;  
 wherein said second optical component includes: 
 a focusing lens array for focusing each of the plurality of intermediate light fluxes split by said first optical component;  
 a polarization converting device which spatially splits each of the plurality of intermediate light fluxes focused by said focusing lens array into P-polarization light flux and S-polarization light flux, and emits the P-polarization light flux and S-polarization light flux with the polarization direction of one matching the polarization direction of the other; and  
 a combining lens for superimposing the light fluxes emitted from said polarization converting device, and  
 
 wherein at least one of the first optical component and second optical component is arranged so that an attachment position thereof is adjustable in a direction intersecting the optical axis.  
 
     
     
       7. The projector according to  claim 6 , wherein said focusing lens array, said polarization converting device, and said combining lens are integrated. 
     
     
       8. The projector according to  claim 7 , further including:
 a color separating optical system for separating the emitted light from said second optical component into a plurality of light fluxes, each light flux having a different color;  
 a plurality of modulating means devices for modulating each of said light fluxes separated by said color separating optical system;  
 a color synthesizing system for synthesizing each of said light fluxes modulated by said plurality of modulating means devices; and  
 a reflecting device disposed in the optical path between said light source and at least one of said plurality of modulating means devices, and arranged such that an angle of attachment relative to the incident optical axis is adjustable;  
 wherein the modulated light flux synthesized by said color synthesizing system is projected on the projection surface via said projecting means lens unit.  
 
     
     
       9. The projector according to  claim 8 , wherein the attachment angle of said reflecting device positioned closest to said modulating device is adjustable. 
     
     
       10. The projector according to  claim 8 , wherein said modulating device is of a reflection type, and wherein said color separating optical system and said color synthesizing optical system are incorporated into the same optical system. 
     
     
       11. A projector having an optical axis, comprising:
 a light source emitting light flux;  
 a modulating device for modulating light flux emitted from said light source in accordance with image signals;  
 a projecting lens unit for performing enlarged projection of said light flux modulated by said modulating device upon a projection surface,  
 a first lens plate and a second lens plate each of which include a plurality of lenses arrayed in matrix-form disposed in the optical path between said light source and said modulating device; and  
 an adjusting mechanism for adjusting an attachment position of at least one of said first and second lens plates in a direction intersecting the optical axis.  
 
     
     
       12. The projector according to  claim 11 , further including:
 a first adjusting mechanism for adjusting said first lens plate in a first direction orthogonally intersecting said optical axis; and  
 a second adjusting mechanism for adjusting said second lens plate in a second direction orthogonally intersecting said optical axis and said first direction.  
 
     
     
       13. The projector according to  claim 12 , said adjusting mechanism further including:
 a spring provided at a first side of said lens plate for pressing said first side; and  
 a screw provided at a second side of said lens plate opposing said first side thereof, for pressing said second side.  
 
     
     
       14. The projector according to  claim 13 , wherein said spring is a leaf spring, and said screw presses the approximate center of said second side. 
     
     
       15. A projector having an optical axis, comprising:
 a light source emitting light fluxes;  
 a first optical component for splitting the emitted light fluxes from said light source into a plurality of intermediate light fluxes, the intermediate light fluxes being focused at a position;  
 a second optical component placed in proximity to the position at which said intermediate light fluxes are focused, said second optical component including: a focusing lens for focusing each of the plurality of intermediate light fluxes split by said first optical component; a polarization converting device which spatially splits each of the plurality of intermediate light fluxes focused by said focusing lens array into P-polarization light flux and S-polarization light flux, and emits the P-polarization light flux and S-polarization light flux with the polarization direction of one matching the polarization direction of the other; and a combining lens for superimposing the light fluxes emitted form from said polarization converting device;  
 a modulating device for modulating light flux emitted formfrom said second optical component;  
 a projecting lens unit for performing enlarged projection of said light flux modulated by said modulating device upon a projection surface; and  
 an adjusting mechanism for adjusting an attachment position of at least one of the first optical component and second optical component in a direction intersecting the optical axis.  
 
     
     
       16. The projector according to  claim 15 , wherein said focusing lens array, said polarization converting device, and said combining lens are integrated. 
     
     
       17. The projector according to  claim 15 , further including:
 a first adjustment mechanism for adjusting said first optical component in a first direction orthogonally intersecting said optical axis; and  
 a second adjusting mechanism for adjusting said second optical component in a second direction orthogonally intersecting said optical axis and said first direction.  
 
     
     
       18. The projector according to  claim 17 , said adjusting mechanism further including:
 a spring provided at a first side of said optical component for pressing said first side; and  
 a screw provided at a second side of said optical component opposing said first side thereof, for pressing said second side.  
 
     
     
       19. The projector according to  claim 18 , wherein said spring is a leaf spring, and said screw presses the approximate center of said second side. 
     
     
       20. A projector having an optical axis, comprising:
 a light source emitting light flux;  
 a modulating meansdevice for modulating light flux emitted from said light source;  
 a projecting meansdevice for performing enlarged projection of said light flux modulated by said modulating means;  
 a reflecting device provided in the optical path between said light source and said modulating means device ;  
 an adjusting mechanism for adjusting an attachment position of said reflecting device device;  
 a light guide for storing said reflecting device;  
 wherein said adjusting mechanism further includes:  
 a holder plate which holds said reflecting device and is rotatably supported by said light guide;  
 a screw for adjusting an angle of said reflecting device; and  
 a spring for supporting said holder plate as to said light guide.  
 
     
     
       21. A projector having an optical axis, comprising:
 a light source emitting light;  
 a color separating optical system for separating the emitted light from said light source into light fluxes of three colors;  
 three modulating means devices for modulating said light flux of each of said three colors separated by said color separating optical system;  
 a color synthesizing system for synthesizing the light flux of each color modulated by said three modulating means devices;  
 a projecting surface;  
 a reflecting device disposed in the optical path between said color separating optical system and at least one of said three modulating means devices; and  
 an adjusting mechanism for adjusting an angle of attachment of said reflecting device;  
 wherein said adjusting mechanism adjusts the attachment angle of said reflecting device positioned closest to said modulating means at least one of said three modulating devices;  
 a light guide for storing said color separating optical system and said reflecting device;  
 wherein said adjusting mechanism further includes:  
 a holder plate which holds said reflecting device and is rotatably supported by said light guide;  
 a screw for adjusting an angle of said reflecting device; and  
 a spring for supporting said holder plate as to said light guide.  
 
     
     
       22. A projector having an optical axis, comprising:
   a light source emitting light;        a color separating optical system that separates the light emitted from the light source into a plurality of color lights;        a plurality of modulating devices that each modulates the color light separated by the color separating optical system;        a light guiding system disposed in a longest optical path between the color separating optical system and each of the plurality of modulating devices, the light guiding system including two lenses and an intermediate lens disposed between the two lenses; and        a projection lens that projects light modulated by the modulating devices;        at least one lens of the two lenses and the intermediate lens being arranged so that any attachment position thereof is adjustable in a direction intersecting the optical axis.     
     
     
       23. The projector according to  claim 22 , further comprising:
   an interface circuit including an input/output interface;        a video circuit that processes a video signal;        a control circuit that drives and controls the projector; and        an outer casing that houses the light source, the color separating optical system, the plurality of modulating devices, the light guiding system, the interface circuit, the video circuit, and the control circuit.     
     
     
       24. A projector having an optical axis, comprising:
   a light source emitting light;        a color separating optical system that separates the light emitted from the light source into a plurality of color lights;        a plurality of modulating devices that each modulates the color light separated by the color separating optical system;        a light guiding system disposed in a longest optical path between the color separating optical system and each of the plurality of modulating devices, the light guiding system including two lenses and an intermediate lens disposed between the two lenses;        a projection lens that projects a light modulated by the modulating devices; and        an adjusting mechanism that adjusts an attachment position of at least one of the two lenses and the intermediate lens in a direction intersecting the optical axis.     
     
     
       25. The projector according to  claim 24 , further comprising:
   an interface circuit including an input/output interface;        a video circuit that processes a video signal;        a control circuit that drives and controls the projector; and        an outer casing that houses the light source, the color separating optical system, the modulating devices, the light guiding system, the interface circuit, the video circuit, and the control circuit.