| 摘要 |
In order to obtain an image without a registration shift, there is provided a color composing optical system which comprises a liquid crystal light valve having a plurality of pixels and a cross dichroic prism for color-composing the light beams emitted from the liquid crystal light valve, characterized in that the following equation is satisfied: Lx|tan THETA |</=W/2,where the length of a pixel pitch of the liquid crystal light valve is W, the air-converted length from the liquid crystal light valve emission surface to the emission surface of the cross dichroic prism is L, and a value of a relative angular deviation when two light rays emitted from the liquid crystal light valve in parallel with the optical axis enter the cross dichroic prism and then are emitted from the cross dichroic prism is THETA .
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