Optics: image projectors – Plural projection paths with single light source
Patent
1981-12-28
1984-01-10
Corbin, John K.
Optics: image projectors
Plural projection paths with single light source
350331R, 350345, 350394, 353 31, 358 61, G02F 113
Patent
active
044250282
ABSTRACT:
A full color high contrast image projection system with oil coupled dichroics and a single projection lens is disclosed. The invention includes a unitary optical tank in which a prepolarizer and dichroic separators are mounted in fixed alignment relative to a main polarizing prism. The prepolarizer acts on the incident light from a source to polarize the green light and reflect the S component out of the system. The red and blue components are transmitted unchanged. The main polarizer is mounted at a 90.degree. twist relative to the prepolarizer so that it reflects the green light to a first light valve via a first dichroic separator. The polarized red and blue components are transmitted to second and third light valves via a second dichroic separator. The light valves modulate the polarization state of incident light before returning it to the second beamsplitter. The second beamsplitter then recombines the individual beams into a single output beam. This beam is projected by a telecentric projection lens to provide a full color high contrast image.
REFERENCES:
patent: 2403731 (1943-04-01), MacNeille
patent: 2958258 (1960-11-01), Kelly et al.
patent: 3463575 (1966-12-01), Gates
patent: 3497283 (1970-02-01), Law
patent: 4127322 (1978-11-01), Jacobson et al.
patent: 4191456 (1980-03-01), Hong et al.
patent: 4345258 (1982-08-01), Tsai et al.
Carson Robert T.
Gagnon Ralph J.
Benman, Jr. William J.
Bethurum William J.
Corbin John K.
Hughes Aircraft Company
Karambelas Anthony W.
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