Importance

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Abstract

Provided is a three-dimensional image projector capable of displaying a highly reproducible three-dimensional image in response to changes in a viewer's position and easily accomplishing system downsizing. The three-dimensional image projector 1 includes: a projection image forming disc 4 in which hologram sheets 9a, 9b, 9c are laminated along inner surfaces 10a, 10b of glass substrates 8a, 8b, and which projects image light by causing the image light having directivity to fall incident on the hologram sheets 9a, 9b, 9c; and a rotational drive unit 3 for rotationally driving the projection image forming disc 4 along a surface of the glass substrates 8a, 8b, with a center point C₁ serving as the rotation center, wherein the hologram sheets 9a, 9b, 9c are preliminarily recorded with holograms 11a, 11b, 11c of a mode that are formed by causing reference light and object light as two laser beams L₃, L₂ to simultaneously fall incident on a position corresponding to the center point C₁ while maintaining the incidence angle θ₁ to the hologram sheets 9a, 9b, 9c to be substantially the same.

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First Claim