Optics: image projectors – Composite projected image – Multicolor picture
Patent
1998-03-30
2000-03-28
Dowling, William
Optics: image projectors
Composite projected image
Multicolor picture
353 20, G03B 2114
Patent
active
06042236&
ABSTRACT:
A light source for emitting a white light in one direction, color light separating means for separating the white light from the light source into three color lights of red light, blue light and green light, modulating means including liquid crystal light valves for modulating the polarized lights contained in the luminous fluxes from the color light separating means, and producing a video image, color light combining means for combining the modulated luminous fluxes after being modulated by the modulating means, and projection optical means for projecting the combined luminous flux obtained by the color light combining means on a screen. A polarizer is disposed at the light exit side of the modulating means. A dichroic filter having characteristics for selectively passing and selectively reflecting the color lights from the modulating means is disposed between the color light combining means and the modulating means positioned on an optical path of at least one color light of the three color lights of the red light, blue light and green light. The quarter-wave plate has a plurality of quarter-wave plates, a first quarter-wave plate of the plurality of quarter-wave plates is contacting with the dichroic filter, and a second quarter-wave plate of the plurality of quarter-wave plates contacts the dichroic filter, and is disposed between the dichroic filter and the color light combining means.
REFERENCES:
patent: 5067799 (1991-11-01), Gold et al.
patent: 5074645 (1991-12-01), Gold et al.
patent: 5515202 (1996-05-01), Wright
patent: 5541673 (1996-07-01), Shioya et al.
patent: 5743610 (1998-04-01), Yajima et al.
patent: 5844637 (1998-12-01), Katsumata
patent: 5875008 (1999-02-01), Takahara et al.
patent: 5879065 (1999-03-01), Shirochi et al.
patent: 5909259 (1999-06-01), Ishino
Hatakeyama Atsushi
Yamagishi Shigekazu
Dowling William
Matsushita Electric - Industrial Co., Ltd.
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