Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1994-09-26
1996-08-13
Nguyen, Hoa T.
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
G11B 1304, G11B 1112, G11B 712
Patent
active
055463649
ABSTRACT:
A magneto-optical memory apparatus for enhancing the recording density of a magneto-optical recording medium, thereby to increase its recording capacity. The magneto-optical recording medium having recording marks, each having two ends in which information is recorded. The apparatus also includes an optical head arranged such that at the time of recording onto the magneto-optical recording medium, the recording marks are recorded such that the ends of each recording mark correspond to a second code of digital information composed of two different types of codes; at the time of reproduction, a light beam having a condensing spot is projected to the magneto-optical recording medium and, when a reproduction light containing reproduction information is entered to the optical head from the magneto-optical recording medium, a reproduction signal is supplied; and when the light beam is projected to a recording mark, an information pulse corresponding to the second code is generated in the reproduction signal, only when the reproduction light from the recording mark interferes with the reproduction light from the non-marking part; and a signal detector circuit for detecting the information pulse in the reproduction signal obtained from the optical head and for converting the reproduction signal into a digital reproduction signal.
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Code Design for Optical Storage--a Comparison to Magnetic Storage by Paul H. Siegel.
High-Density Magneto-Optic Disk Using Highly Controlled Pit-Edge Recording by Sukeda et al.
Daniel Rugar, "Magneto-Optic Direct Overwrite Using a Resonant Bias Coil", IEEE Trans. on Mag. vol. 24, No. 1, Jan. 1988, pp. 666-669.
Deguchi Toshihisa
Fuji Hiroshi
Kojima Kunio
Ohta Kenji
Takahashi Akira
Nguyen Hoa T.
Sharp Kabushiki Kaisha
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