ILLUMINATION DEVICE, PROJECTION APPARATUS AND PROJECTION-TYPE IMAGE DISPLAY APPARATUS

摘要

An optical device including a hologram recording medium that can reproduce an image of a reference member and an irradiation unit that emits a coherent light beam to the optical device. The irradiation unit includes a light source for emitting a coherent light beam and a scanning device capable of adjusting a reflection angle of the coherent light beam emitted from the light source and that makes a reflected coherent light beam scan the hologram recording medium. The light source has light sources for emitting coherent light beams having different wavelength ranges. The hologram recording medium has a plurality of recording areas to be scanned with a plurality of coherent light beams reflected by the scanning device, respectively. Each of the plurality of recording areas has an interference fringe that diffracts a coherent light beam of the corresponding wavelength range.

主权项

1. An illumination device comprising:
an optical device including a hologram recording medium capable of reproducing an image of a reference member; and an irradiation unit to irradiate a coherent light beam to the optical device so that the coherent light beam scans the hologram recording medium, wherein the irradiation unit comprises:
a light source for emitting a coherent light beam; anda scanning device capable of adjusting a reflection angle of the coherent light beam emitted from the light source and to make a reflected coherent light beam scan on the hologram recording medium,wherein the light source comprises a plurality of light sources for emitting a plurality of coherent light beams having different wavelength ranges,the hologram recording medium comprises a plurality of recording areas to be scanned with a plurality of coherent light beams reflected by the scanning device, respectively,each of the plurality of recording areas comprises an interference fringe that diffracts a coherent light beam of the corresponding wavelength range, andthe reflection angle of the scanning device is controlled so that a coherent light beam having a wavelength range corresponding to each of the plurality of recording areas is incident on the corresponding recording area and a coherent light beam having a wavelength range different from the corresponding wavelength range is not incident on the corresponding recording area,wherein the optical device uses the plurality of coherent light beams reflected by interference fringes of the plurality of recording areas to reproduce the image of the reference member so that each of the coherent light beams is diffracted by the hologram recording medium and the diffracted coherent light beams are superimposed on at least one portion.