| 摘要 |
PROBLEM TO BE SOLVED: To obtain a hologram device in which the reproduced image of a hologram is sharply visible even in a room and the image can be seen as if it is moving while the observation point is fixed. SOLUTION: When a LED 4a in the left side is turned on as shown in (a), an image of a triangular prism 6a directing in a diagonal right side is reproduced in the hologram 3. When a LED 4b in the center is turned on as shown in (b), an image of the triangular prism 6b directing the front is reproduced. When a LED 4c in the right side is turned as shown in (c), an image of the triangular prism 6c directing in a diagonal left side is reproduced. Therefore, by successively and individually flipping three switches to turn on and off the three LEDs 4a, 4b, 4c to repeat the on-off state in the order of 4a, 4b, 4c, 4b, 4a and so on, the triangular prism is observed by the observer as if it swings. Because the hologram 3 is illuminated by the LEDs 4a, 4b, 4c at about 45 angles, the reproduced hologram images are sharply visible.
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