Optics: image projectors – Plural projection paths with single light source
Patent
1981-12-28
1985-02-19
Corbin, John K.
Optics: image projectors
Plural projection paths with single light source
350345, 350337, 350408, 353 31, G02F 113, G03B 2100, G02B 530
Patent
active
045001723
ABSTRACT:
An optical arrangement is disclosed which provides color selective prepolarization of the light incident upon two or more light valves. This is accomplished by the use of a prepolarizing prism which acts on light from a light source to direct light of a first polarization to a first dichroic separator and light of a second polarization to a second dichroic separator. Each separator transmits an output beam having substantially a single color and a single polarization state. The two resulting beams are recombined by a dichroic adder prior to being applied to a second polarizing prism. The second polarizing prism directs light of a first color and polarization to a first light valve and light a second color and polarization to a second light valve. The result is that one light valve sees light of a first color and a first polarization and the other light valve sees light of a second color and second polarization. Each light valve modulates the polarization state of incident light in accordance with the input or writing light. Where the writing light is present, the polarization state is changed from the first to the second or vice versa depending upon the light valve. The output of each light valve is applied to a second or main polarizing prism which converts the modulations of polarization into modulations of brightness. The output of the main polarizing prism is then applied to a projection lens in a conventional manner.
REFERENCES:
patent: 2403731 (1946-07-01), MacNeille et al.
patent: 4019807 (1977-04-01), Boswell et al.
patent: 4191656 (1980-03-01), Hong et al.
patent: 4345258 (1982-08-01), Tsai et al.
Hong et al., II, "Application of the Liquid Crystal Light Valve to a Large Screen Graphics Display", SID, May 8, 1979.
Cedarstrom Roy A.
Gagnon Ralph J.
Benman, Jr. W. J.
Corbin John K.
Hughes Aircraft Company
Karambelas A. W.
Lewis David
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