US 2002/0171938 A1 · Projector

Abstract

The present invention improves the precision of color synthesis and suppresses the generation of vertical stripes in the projected image, and includes at least the following three aspects. A projector which uses a dichroic prism for color synthesis, which employs: (1) a dichroic prism which is formed using triangular prisms in which projections or grooves that have two faces parallel to the two pasted faces are integrally injection-molded on the faces that are substantially perpendicular to the light beam (i.e., the faces through which no light beam passes); (2) a dichroic prism which is positioned using marks on the pasted faces of the triangular prisms; or (3) a dichroic prism which is formed by engaging triangular prisms in which recesses or projections are formed.

Claims8

Dependent claims

A projector comprising:

a light source;
color separating means for separating the light beam emitted from said light source into light beams of respective colors;
light valves which modulate the separated light beams of respective colors;
a dichroic prism which synthesizes the modulated light beams of respective colors that have been modulated via said light valves;
and
a projection lens which enlarges and projects the synthesized modulated light beam onto a screen;
wherein said dichroic prism is a prism formed by pasting together four triangular prisms which are substantially right-angled triangular prisms in cross section;
and
as said triangular prisms, are used triangular prisms in which projections or grooves that have two faces forming planes parallel to the two pasted faces are integrally molded in the faces that are substantially perpendicular to the light beams (i.e., faces through which the light beams do not pass).

6 more elements

Dependencies are inferred from the claim text.

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Abstract

Claims8