Patent ID: 6010221
Filing Date: 2000-01-04
Classification: G02B,H04N

Abstract:
An analyzing-synthesizing optical system unit for projection image display apparatus in which beams of the three primary colors of R, G, and B are modulated by respective, dedicated polarization beam splitters and light valves, the modulated beams are extracted, and a synthesizing optical system synthesizes the modulated beams of the three colors to output synthetic light,wherein said light valves and said polarization beam splitters are fixed as integrated with said synthesizing optical system and wherein optical path lengths of optical paths of the respective color beams, each optical path being established by said light valve, said polarization beam splitter, and said synthesizing optical system, are approximately equal to each other; andwherein each of said polarization beam splitters is fixed in a constituent member to which said synthesizing optical system is also fixed.