Patent ID: 6513934
Filing Date: 2003-02-04
Classification: G02B,H04N

Abstract:
A projection apparatus comprising means for supplying light, a color separating system for separating the light from said means into a plurality of color beams, a plurality of light modulating elements for modulating the respective color beams separated by the color separating system, based on an image signal, a color combining system for combining the color beams emerging from the respective light modulating elements, a projection optical system for projecting composite light of the color beams combined by the color combining system onto a plane, and a half-wave plate disposed between said color combining system and said plane, wherein the color combining system comprises a plurality of dichroic films, each of the color beams incident to the dichroic films is a linearly polarized light, and the following relation is met:0Â°where &thgr; is an angle between a polarization direction of a first color beam component transmitted by all the dichroic films upon incidence of said first color beam component on the dichroic films and a polarization direction of a second color beam component reflected by one of the dichroic films upon incidence of said second color beam component on said one of the dichroic films.