Three-dimensional image projector with a projection image forming disc with a hologram recording medium formed along a disc-shaped glass substrate
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United States of America Patent
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Jun 11, 2013
Grant Date -
Feb 24, 2011
app pub date -
Mar 12, 2009
filing date -
Mar 13, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
An object of the present invention is to display a highly reproducible three-dimensional image in response to changes in the viewer's position and to easily realize the miniaturization of the system. The three-dimensional image projector includes a projection image forming disc in which a hologram recording medium is formed along a disc-shaped glass substrate, and which projects image light having directivity by causing the image light to fall incident on the hologram recording medium, and a rotational drive unit for rotationally driving the projection image forming disc along a surface of the glass substrate with the center point on the surface as a rotation center. The projection image forming disc 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.
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