| 摘要 |
A holographic projection device for displaying a 3-dimensional image comprises an elliptical holographic disc, and a cylindrical base having a diagonally-cut top portion. The elliptical holographic disc comprises a rigid planar substrate, a reflection-type hologram, and a sound chip for producing a voice or music effect. The cylindrical base comprises a point source of white light for illuminating the reflection-type hologram, and a sonic transducer for generating a sound. The reflection-type hologram projects an upright orthoscopic image having both horizontal and vertical parallaxes. The cylindrical base has the capability of detachably mounting the elliptical holographic disc so that different elliptical holographic discs can be interchangeably mounted on the cylindrical base. Each elliptical holographic disc has a distinct holographic image and a distinct voice or music effect. This invention relates to holographic projection devices for displaying a 3-dimensional image, and the principal use of the invention is for optical decoration.
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