Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1992-02-03
1993-08-03
Beausoliel, Jr., Robert W.
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
360 59, 360114, G11B 1304, G11B 1110, G11B 1112
Patent
active
052335771
ABSTRACT:
A magneto-optical recording apparatus provided with a magnetic field modulator (8). The magnetic-field modulator (8) has a field coil (18) for generating a magnetic field and switches (11,12,15,16,22) for coupling at least one terminal (17) of the magnet coil (18) to a first potential point (10) at a first potential (Vp) or a second potential point (14) at a second potential (Vn) depending on the logic value of a control signal (vs), in order to produce in the field coil an alternating current whose polarity depends on the logic value. The field coil (18) is arranged in a parallel resonant circuit (18,21). The switches have means (12,16) for inhibiting, after the terminal (17) has been uncoupled from one of the potential points (10,14), current supply from the other potential point for a time interval corresponding to half the resonant period of the resonant circuit (18,21). This magnetic-field modulator provides a very rapid reversal of the current through the field coil.
REFERENCES:
patent: 4466027 (1984-08-01), Howell et al.
patent: 4712203 (1987-12-01), Saito et al.
patent: 4872078 (1989-10-01), Gerber et al.
patent: 4937802 (1990-06-01), Omori et al.
patent: 5020041 (1991-05-01), Nakao et al.
"Current Reversal in Inductive Loads" IBM Technical Disclosure Bulletin, vol. 11, No. 10 Mar. 1969.
"Erasable Magneto-Optical Recording" Philips Technical Review, vol. 42, No. 2 Aug. 1985.
Bakx Johannes L.
Hoeven Petrus C. J.
Beausoliel, Jr. Robert W.
Botjer William L.
U.S. Philips Corp.
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