Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1993-09-24
1994-07-05
Lerner, Martin
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
353 31, 359256, 359494, 359495, 359499, G02B 530, G02B 2728, G02F 11335, G03B 2100
Patent
active
053272706
ABSTRACT:
A polarizing beam splitter apparatus of a light valve image projection system includes a polarizing beam splitter commonly usable as a polarizer and an analyzer, and a quarter wave plate in combination. In the polarizing beam splitter apparatus, a quarter wave plate is arranged in a light path along which a light passes out from and passes back again to the polarizing beam splitter in such a manner that either a fast axis or a slow axis of the quarter wave plate is perpendicular to a plane containing both a first optical axis and a second optical axis of the polarizing beam splitter, so that the angular range of a light to be used can be increased. In the light valve image projection system, a light outputted from a light source is incident through a polarizing beam splitter apparatus to a light valve, and an effective component of the light reflected from the light valve is projected through the polarizing beam splitter apparatus and a projection lens on a projection screen. The polarizing beam splitter apparatus is high in polarization efficiency even if the range of incident angle of a light to be used is large, so that a projected image highly improved in contrast and brightness can be obtained.
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Lerner Martin
Matsushita Electric - Industrial Co., Ltd.
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