Patent ID: 6497485
Filing Date: 2002-12-24
Classification: H04N

Abstract:
A projector comprising:a light source; a first optical element that condenses a light beam from the light source and divides the light beam into a plurality of intermediate light beams, the first optical element having a light-emitting side; a second optical element placed on the light-emitting side of the first optical element that converts the plurality of intermediate light beams into one type of polarized light beams and superimposing the polarized light beams on a reflection-type modulation device; an optical color-light-producing system that produces a plurality of color light by time division from light emitted from the second optical element; only one reflection-type modulation device that modulates color light produced by the optical color-light-producing system; a polarized light beam selection element placed on an optical path between the second optical element and the reflection-type modulation device that reflects or transmits the light emitted from the second optical element to allow the emitted light to reach the reflection-type modulation device, and that transmits or reflects the light modulated by the reflection-type modulation device to allow the modulated light to reach a projection optical system; and a collimating lens placed between the second optical element and the polarized light beam selection element.