| 摘要 |
The present invention has as its object to provide a projection type display apparatus which suffers little from the occurrence of the distortion of the surface of a dichroic mirror in a color combining optical system, and the occurrence of the deformation of a projected image by the angular deviation of the surface of the dichroic mirror and in which the correction of the chromatic aberration of magnification of a projection lens is stably possible during mass production. So, the color combining system of the present invention is provided with at least three prisms, two dichroic mirror layers for reflecting lights differing in wavelength area from each other, the two dichroic mirror layers being formed so as not to intersect with each other with one of the three prisms which is located most adjacent to the light exit side interposed therebetween, and at least one optical element having positive or negative refractive power. The optical element receives light from at least one of a plurality of light modulating elements, and causes the light to enter one of the at least three prisms. The light exit surface of the prism located most adjacent to the light exit side serves also as a total reflection surface for reflecting the light to one of the two dichroic mirror layers.
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