US 6,981,773 B2
Projector
Shunji Kamijima, Hara-mura (Japan); and Masatoshi Yonekubo, Hara-mura (Japan)
Assigned to Seiko Epson Corporation, Tokyo (Japan)
Filed on Jun. 22, 2004, as Appl. No. 10/872,385.
Claims priority of application No. 2003-198136 (JP), filed on Jul. 16, 2003.
Prior Publication US 2005/0018150 A1, Jan. 27, 2005
Int. Cl. G03B 21/28 (2006.01); G03B 21/14 (2006.01); G03B 3/00 (2006.01); G02B 7/02 (2006.01)
U.S. Cl. 353—81 5 Claims
OG exemplary drawing
 
1. A projector comprising:
a light source that supplies a light;
a spatial light-modulator that modulates the light based on an image signal and outputs a modulated light;
a projection lens that projects the modulated light to display an image on a screen; and
an optical element inserting unit that inserts a first optical element in an optical path, wherein
the optical element inserting unit includes a position fixing unit that keeps an angle between the spatial light-modulator and the first optical element constant.