Patent ID: 6565213
Filing Date: 2003-05-20
Classification: G03B,H04N

Abstract:
A projection apparatus comprising:a light source; separation optical means for color separating a light beam from the light source into a plurality of color light beams; a plurality of transmission type optical modulation elements for modulating the separated color light beams; synthesis optical means for generating a light flux by synthesizing the respective color light beams modulated by the optical modulation elements; and projection optical means for projecting the synthesized light flux, wherein the projection apparatus further comprises: a prism holder for holding a synthesizing prism as the synthesis optical means, the prism holder including a first positioning portion, and being positioned and fixed to one end plane and the other end plane of the synthesizing prism opposite to each other, except for incidence planes of the synthesizing prism on which the respective color light beams are incident and an outgoing plane of the synthesizing prism for outputting the synthesized light flux to the side of the projection optical means, and a lens holder for holding the prism holder and a projection lens as the projection optical means, the lens holder including a second positioning portion which is fitted to the first positioning portion of the prism holder to make positioning and fixing.