Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1991-02-20
1992-10-06
Epps, Georgia Y.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 41, 358 61, 353 31, G02F 113
Patent
active
051537524
ABSTRACT:
A liquid crystal type video projector is disclosed which has a reflection type optical modulator for effective use of beams from a radiation source such as a lamp or the like. The projector further comprises means for modulating the plane of polarization of a polarized beam entering the radiation source and for reflecting the polarized beam, thereby causing a reflection beam and an optical arrangement. The optical arrangement includes a first polarizing beam splitter for separating the beam from the radiation source into P and S polarized components and for directing the S polarized component to the modulator and a converter for rotating the plane of polarization of the P polarized component and converting into another S polarized component for enhanced efficiency of beam utilization. It further includes a second polarizing beam splitter for reflecting the other S polarized component and directing the other S polarized component and directing to the modulator. The polarizing beam splitters are caused to act as an analyzer for colored reflected beams via a dichroic mirror system.
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Kanashiki Masaaki
Kurematsu Katsumi
Minoura Nobuo
Mitsutake Hideaki
Yanagi Haruyuki
Canon Kabushiki Kaisha
Epps Georgia Y.
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