Reflection type projector with four imaging units and a color wh

Details Reflection type projector with four imaging units and a color wh Reflection type projector with four imaging units and a color wh

1998-04-09

2000-11-07

Sikes, William L.

Liquid crystal cells, elements and systems

Liquid crystal system

Projector including liquid crystal cell

349 5, 349 6, 353 31, 353 34, G02F 11335, G03B 2100, G03B 2126

Patent

active

061444200

ABSTRACT:
A reflection type projector includes: a light source; a polarization beam splitter for transmitting or reflecting an input light according to a polarization component thereof; a dichroic beam splitter, having first and second dichroic reflection surfaces for transmitting or reflecting a ray of one polarized light emitted from the light source and split by the 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 the 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 the light source and split by the polarization beam splitter and reflecting the formed image; a color filter, disposed between the polarization beam splitter and the fourth imaging unit and capable of rotating, for determining the color of a ray proceeding toward the fourth imaging unit; a projection lens unit for magnifying and projecting rays reflected from the first, second, third and fourth imaging units and passing through the polarization beam splitter to be focused on a screen.

REFERENCES:
patent: 5260815 (1993-11-01), Takizawa
patent: 5517340 (1996-05-01), Doany et al.
patent: 5577826 (1996-11-01), Kasama et al.
patent: 5829852 (1998-11-01), Jung

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