Light-modulating projector

Details Light-modulating projector Light-modulating projector

2007-09-11

2007-09-11

Perkey, W. B. (Department: 2851)

Optics: image projectors

Composite projected image

Multicolor picture

C353S081000, C359S490020, C359S634000, C348S338000, C348S339000

Reexamination Certificate

active

11067629

ABSTRACT:
Exemplary embodiments of the invention provide a projector that can readily correct for chromatic aberration caused by, for example, a projecting lens without having to give a cross dichroic prism, for example, a special preliminary process. Illumination-light components modulated by corresponding liquid-crystal light valves are synthesized in a cross dichroic prism (27) to form image light. The image light enters a projecting lens (29) from which the image light is projected onto a screen, which is not shown in the drawings. In the cross dichroic prism (27) used to synthesize light components, a first prism element (P1) has a refractive index higher than that of remaining prism elements (P2,P3and P4). This allows a width of a red projection-image component to be made larger than widths of projection-image components of remaining colors, whereby the chromatic aberration in the projecting lens can be readily corrected.

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