| 摘要 |
This invention can provide an optical system which has a diffractive optical element that can suppress generation of flare or the like due to light rays of unnecessary orders of diffraction caused by the wavelength dependence of the diffractive optical element without using any complicated arrangement. In an optical system, light from a light source is separated into light rays of predetermined wavelength regions by a color separation optical system. Those light rays are incident on pixels of an image display element having a plurality of pixels in correspondence with the predetermined wavelength regions. An image displayed on the image display element is projected in an enlarged scale by a projection optical system. A diffractive optical element is disposed near the pupil of the projection optical system, and the diffraction efficiency of the diffractive optical element can be optimized in each of predetermined wavelength regions.
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