Static information storage and retrieval – Magnetic bubbles – Guide structure
Patent
1978-02-08
1980-09-23
Cardillo, Jr., Raymond F.
Static information storage and retrieval
Magnetic bubbles
Guide structure
1791001S, 1791003V, 350 379, 365125, 365216, G11B 712, G11B 1700
Patent
active
042244803
ABSTRACT:
A holographic playback system comprises a turntable adapted to support a record disk which contains a series of holograms recorded along convoluted spiral tracks. Each of the holograms represents a pattern of data bits and synchronization bit, and an optical system for directing a laser beam to the record disk, whereby the laser beam is diffracted by the interference fringes of the hologram to reconstruct the image of the pattern of data and synchronization bits. The turntable is driven so that the holograms are successively shifted in location with respect to the laser beam and illuminated by the beam. A solid-state image sensor is provided which includes a plurality of charge storage type sensing elements each positioned to receive the reconstructed image of each data bit and a non-charge storage type sensing element positioned to receive the reconstructed image of the synchronization bit. The charge storage type image sensing elements is sequentially triggered to generate a series of binary signals before a subsequent hologram is shifted to the beam-illuminated position. The binary signals are then decoded into the original signal for reproduction. The speed of the turntable is controlled in accordance with the reproduced synchronization signal.
REFERENCES:
patent: 3848095 (1974-11-01), Wohlmut et al.
patent: 3891794 (1975-06-01), Russel
patent: 3939302 (1976-02-01), Kihara
patent: 3964032 (1976-06-01), Bardos
patent: 4005259 (1977-01-01), Kaneko
patent: 4021606 (1977-05-01), Takeda et al.
patent: 4094011 (1978-06-01), Nagao
Kato Makoto
Satoh Isao
Adams Bruce L.
Burns Robert E.
Cardillo, Jr. Raymond F.
Lobato Emmanuel J.
Matsushita Electric - Industrial Co., Ltd.
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