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18 March 1998 Fluctuation hologram with multiple images
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Proceedings Volume 3293, Practical Holography XII; (1998)
Event: Photonics West '98 Electronic Imaging, 1998, San Jose, CA, United States
This paper is concerned with illumination systems for fluctuating the images of rainbow holograms by an LCD projector and a wide mirror array. The authors introduce the early display systems developed for fluctuation holograms. These systems are not enough to fluctuate them arbitrarily because the locations or the angles of their light sources are fixed or cyclically varied. The authors developed an illumination system by which the observer can see the image of the hologram fluctuated like under the natural environment. An LCD projector and a lens-mirror array are used in the illumination system. The lens-mirror array is composed of about 400 small mirrors pasted over with thin concave lenses. The beam projected out of the LCD projector covers the lens-mirror array. The beam reflected by the lens-mirror array is centered for the hologram panel fixed above the LCD projector. When the highlight zone from the LCD projector is continuously moved on the lens-mirror array, the image of the hologram is smoothly fluctuated. In the case of a large holographic optical lens panel instead of the lens-mirror array, the illumination system becomes more simple. The time to adjust the position of the hologram and the angle of the holographic optical lens panel is extremely reduced. Although the bright area is limited around the zone of the mid height, the movement of the rainbow hologram becomes more natural. Next the authors prepared a multiple exposed hologram that was recorded multiple images like a stereogram. This case realized that the image of the hologram is fluctuated more complicatedly because the multiple images are reconstructed by the multiple illuminations.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Koji Yamasaki, Masaaki Okamoto, Ikuo Nakamura, and Eiji Shimizu "Fluctuation hologram with multiple images", Proc. SPIE 3293, Practical Holography XII, (18 March 1998);


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