Liquid crystal projector device

1. A liquid crystal projector device comprising an optical device 3 for generating color image light, and a projection lens 20 for projecting the color image light generated by the optical device 3 ′ toward a screen, the optical device 3 comprising three image generating units 50 , 60 , 70 for generating image light of three primary colors, and a color synthesis prism 30 for synthesizing the image light of three primary colors generated by the three image generating units 50 , 60 , 70 into color image light, the three image generating units 50 , 60 , 70 each having a liquid crystal panel and a polarizing plate arranged on the optical axis, and having an optical compensating plate arranged between the liquid crystal panel and the polarizing plate for compensating birefringence of light caused by the liquid crystal panel, the polarizing plate and the optical compensating plate of each image generating unit being held by a combination frame 9 and placed on a support base 8 , the combination frame 9 comprising a polarizing plate frame 90 for holding the polarizing plate, and a compensating plate frame 91 for holding the optical compensating plate, the polarizing plate frame 90 being supported on the support base 8 via a rotation adjustment mechanism 92 for rotating the polarizing plate about the optical axis, the compensating plate frame 91 being supported on the polarizing plate frame 90 via an inclination adjustment mechanism 93 for inclining the optical compensating plate by rotating the optical compensating plate about two axes perpendicular to the optical axis and perpendicular to each other.

2. The liquid crystal projector device according to claim 1 , wherein the rotation adjustment mechanism 92 of each of the image generating units comprises a circular arc guide surface 80 formed on the support base 8 and having a central axis parallel to the optical axis of each image generating unit, a circular arc sliding piece 94 projecting from the polarizing plate frame 90 and slidable on the circular arc guide surface 80 , and fixing means for fixing the circular arc sliding piece 94 to the circular arc guide surface 80 .

3. The liquid crystal projector device according to claim 1 , wherein the inclination adjustment mechanism 93 of each of the image generating units comprises a support pin 96 projecting from one end of the polarizing plate frame 90 , a cut 97 provided by recessing one end of the compensating plate frame 91 and in loose engagement with the support pin 96 , two engagement pins 98 , 98 projecting from the other end of the polarizing plate frame 90 , two engagement holes 99 , 99 opened at the other end of the compensating plate frame 91 for the engagement pins 98 , 98 to extend therethrough, and fixing means for fixing the compensating plate frame 91 to the polarizing plate frame 90 , each engagement pin 98 comprising a thin shank 87 longer than the thickness of the compensating plate frame 91 , and a thick shank 88 projecting from the top end of the thin shank 87 , each engagement hole 99 being sized for the thin shank 87 of the corresponding engagement pin 98 to loosely extend therethrough.