G - Physics – 03 – B
Patent
G - Physics
03
B
88/120, 88/65
G03B 33/00 (2006.01) H04N 9/31 (2006.01)
Patent
CA 1218546
ABSTRACT A full color high contrast image projection system with oil coupled dichroics is disclosed. The preferred embodiment 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° 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.
418553
Carson Robert T.
Gagnon Ralph J.
Gowling Lafleur Henderson Llp
Hughes Aircraft Company
Victor Company Of Japan Limited
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