Patent ID: 8459801

Claim:
A three-dimensional image projector, comprising: a projection image formation unit in which a hologram recording medium is formed along a tabular substrate, and which projects image light having directivity by causing the image light to fall incident on the hologram recording medium; and a drive unit for rotationally driving the projection image formation unit along a surface of the substrate with a predetermined point on the surface as a rotation center; wherein the projection image formation unit is preliminarily recorded with a hologram by causing two laser beams as reference light and object light to simultaneously fall incident on the hologram recording medium; and wherein the projection image formation unit is preliminarily recorded with a plurality of holograms in a multiplexed manner while changing an incident direction of the object light on the hologram recording medium, and the drive unit is configured to rotationally drive the projection image formation unit so that the plurality of holograms are sequentially arranged within a predetermined fixed range on the substrate.