Patent ID: 6885484

Claim:
An information display optical system comprising: a display element that displays an image formed by light of different wavelength bands; a prism that transmits an image light incident thereon from the display element; and a holographic optical element including a plurality of holograms that have diffraction efficiency in the different wavelength bands so as to be capable of reproducing different wavefronts in the different wavelength bands, the holographic optical element having an optical power equivalent to an optical power of a concave free-form reflective surface so as to function as an eyepiece lens by directing the image light from the display element to an observer's eye, wherein aberration resulting from a fact that the light transmitted through the prism includes light of the different wavelength bands is corrected by the holographic optical element reproducing the different wavefronts in the different wavelength bands and wherein the corrected aberration is longitudinal chromatic aberration that occurs along an optical axis of the optical system.