Patent ID: 6144420
Filing Date: 2000-11-07
Classification: G02B,H04N

Abstract:
A reflection type projector comprising:a light source;a polarization beam splitter for at least one of transmitting and reflecting an input light according to a polarization component thereof;a dichroic beam splitter, having first and second dichroic reflection surfaces, for at least one of transmitting and reflecting a ray of one polarized light emitted from said light source and split by said polarization beam splitter to thereby be split into three colors;first, second and third imaging units, respectively disposed at positions corresponding to light output surfaces of said dichroic beam splitter, for forming an image from the input light and reflecting the formed image;a fourth imaging unit for forming an image from a ray of the other polarized light emitted from said light source and split by said polarization beam splitter and reflecting the formed image;a color filter, disposed between said polarization beam splitter and said fourth imaging unit and capable of rotating, for determining the color of a ray proceeding toward said fourth imaging unit;a projection lens unit for magnifying and projecting rays reflected from said first, second, third and fourth imaging units and passing through said polarization beam splitter to be focused on a screen.