Projektionsdarstellungsgerät.

摘要

A projection display apparatus which is designed to separate a light from the light source into color lights of three primary colors by a color separator, irradiate the respective color lights to corresponding three light valves, combine the optical images on the light valves by a light combiner formed by intersecting dichroic reflection surfaces in X-letter form, followed by projecting the combined image by enlargement on a screen with a projection lens. The color separator is made by intersecting in X-letter form a first and second flat plate type dichroic mirrors. The second dichroic mirror is composed of two small dichroic mirrors made by separating into two parts at the intersecting part. The two small type dichroic mirrors are disposed on mutually different places so that, when viewed from the output side of the light which advances straightly through the color separator, the two edge surfaces which form the intersecting part of the two small dichroic mirrors are seen in overlapped state. Due to the existence of the two places of the intersecting parts of the dichroic mirrors, it is possible to make the produced bright lines on the projected image less conspicuous.