Patent ID: 6327092
Filing Date: 2001-12-04
Classification: G02B,H04N

Abstract:
A cross dichroic prism in which four square pillar prisms are mutually joined, satisfying the following condition,L1.noteq.L2=L3=L4where L1, L2, L3, and L4 are lengths of lines which extend perpendicularly to non-joined surfaces of the four square pillar prisms from a point of intersection of dichroic films, respectively,wherein said dichroic prism is constructed such that three color lights to be combined by the dichroic films are adapted to be incident on the non-joined surfaces of said square pillar prisms respectively having the length L2, L3 and L4, and/or three color lights from the dichroic films are adapted to emerge from the non-joined surfaces of said square pillar prisms respectively having the lengths L2, L3 and L4.