Projection lens and projector

Abstract

A first holding member holds a first optical system and a first mirror, and has a first junction surface. A second holding member holds a second optical system and a second mirror, and has a second junction surface. A junction portion is configured such that, in a state where the first junction surface and the second junction surface are aligned with each other, the second holding member is capable of being shifted in a direction of both the junction surfaces and rotated around an optical axis, and makes it possible to perform optical axis alignment. An emission-side optical axis of the first optical system and an incidence-side optical axis of the second optical system are aligned with each other, and thus a U-shaped optical path is formed by the first and second optical systems.

What is claimed is: 
     
         1 . A projector comprising:
 a projector body;   an image forming panel;   a lens mount on which a first projection lens including an optical axis bending member or a second projection lens is selectively mounted; and   an optical member between the lens mount and the image forming panel in an optical path,   wherein a projection distance or a projection angle of the first projection lens is different from a projection distance or a projection angle of the second projection lens, and   wherein the first projection lens and the second projection lens project a projected image using the optical member and the image forming panel commonly.   
     
     
         2 . The projector according to  claim 1 , wherein the first projection lens and the second projection lens are shiftable with respect to the projector body at least in a vertical direction, so that the projector can change a projection position of the projected image in a state where a position of the projector is fixed. 
     
     
         3 . The projector according to  claim 1 , wherein the projection lens is shiftable with respect to the projector body in a horizontal direction. 
     
     
         4 . The projector according to  claim 1  further comprising:
 a first frame that holds at least an incident lens; 
 a second frame that holds at least an emission lens; and 
 a third frame that holds an intermediate lens, 
 wherein the first projection lens is a combination of at least the second frame and the third frame. 
 
     
     
         5 . The projector according to  claim 4 , wherein the optical member is the incident lens of the first frame. 
     
     
         6 . The projector according to  claim 4  further comprising:
 a fourth frame that holds the optical axis bending member, 
 wherein the first projection lens is a combination of at least the fourth frame, the second frame, and the third frame. 
 
     
     
         7 . The projector according to  claim 4  further comprising:
 wherein the optical axis bending member and the intermediate lens are located outside of an edge of the projector body in a side view, and 
 wherein the incident lens and the emission lens are located inside of the edge of the projector body in the side view. 
 
     
     
         8 . The projector according to  claim 7 , wherein the incident lens is located more inside of the edge than the emission lens in the side view. 
     
     
         9 . The projector according to  claim 4  further comprising:
 a holding member including the first frame and the lens mount, 
 wherein the first projection lens and the holding member composes a substantially U-shaped optical path. 
 
     
     
         10 . The projector according to  claim 4  further comprising:
 a holding member including another optical axis bending member, the first frame and the lens mount. 
 
     
     
         11 . The projector system comprising:
 the projector according to  claim 1 ;   the first projection lens, and   the second projection lens.   
     
     
         12 . The projector system comprising:
 the projector according to  claim 2 ;   the first projection lens, and   the second projection lens.   
     
     
         13 . The projector system comprising:
 the projector according to  claim 3 ;   the first projection lens, and   the second projection lens.   
     
     
         14 . The projector system comprising:
 the projector according to  claim 4 ;   the first projection lens, and   the second projection lens.   
     
     
         15 . The projector system comprising:
 the projector according to  claim 5 ;   the first projection lens, and   the second projection lens.   
     
     
         16 . The projector system comprising:
 the projector according to  claim 6 ;   the first projection lens, and   the second projection lens.   
     
     
         17 . The projector system comprising:
 the projector according to  claim 7 ;   the first projection lens, and   the second projection lens.   
     
     
         18 . The projector system comprising:
 the projector according to  claim 8 ;   the first projection lens, and   the second projection lens.   
     
     
         19 . The projector system comprising:
 the projector according to  claim 9 ;   the first projection lens, and   the second projection lens.   
     
     
         20 . The projector system comprising:
 the projector according to  claim 10 ;   the first projection lens, and   
       the second projection lens.