COLOR DECOMPOSING AND COMPOSING PRISM, IMAGE FORMING OPTICAL SYSTEM, IMAGE PROJECTING OPTICAL SYSTEM AND IMAGE PROJECTION APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a color decomposing and composing prism capable of performing color decomposition, analysis and color composition by one prism and having an optical film disposition which does not give adverse influence on an image.;SOLUTION: The color decomposing and composing prism 2 is formed by joining four prism members 21 to 24. The color decomposing and composing prism has at least five optical surfaces on the outer surface thereof. Each prism member has at least three optical surfaces including two optical surfaces orthogonal to each other. The four prism members are joined so that sides AF at which the two optical surfaces are made to be orthogonal to each other in the respective prism members come close to or come in contact with each other and a wavelength selection polarizing films I and II are provided at joining parts of the four prism members.;COPYRIGHT: (C)2008,JPO&INPIT