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 on an illumination zone, the optical device varying an incidence angle of a coherent light beam at each position on the illumination zone with time; and an irradiation unit configured to irradiate the 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 configured to be 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, andwherein the scanning device comprises a mirror that is rotatable about one axis line and reflects the plurality of coherent light beams having different wavelength ranges in different directions; wherein the hologram recording medium comprises a plurality of recording areas corresponding to a plurality of coherent light beams reflected by the scanning device, respectively, and wherein each of the plurality of recording areas comprises an interference fringe that diffracts a coherent light beam of the corresponding wavelength range; wherein each of the plurality of coherent light beams is scanned on the corresponding recording medium; and wherein the plurality of coherent light beams diffracted by interference fringes of the plurality of recording areas repeatedly illuminate at least a part of the illumination zone to reproduce the image of the reference member.