Method and apparatus for direct overwriting information on a mag

Details Method and apparatus for direct overwriting information on a mag Method and apparatus for direct overwriting information on a mag

1989-05-25

1992-06-09

Levy, Stuart S.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360114, 360 66, G11B 1304, G11B 1112

Patent

active

051213699

ABSTRACT:
Direct overwriting of encoded data along a track in a magneto-optic recording medium is described. A laser beam, not modulated by data, is directed at the active side of the medium to locally heat the width of one track for conditioning it for direct overwriting. A magnetic head comprising an inductor and a capacitance in parallel with the inductor is movable in an appropriate manner to a selectable track. While the head is in alignment with the beam, current of a preselected polarity is supplied from a current source to the inductor. The current source is disconnected to reverse the field of the magnetic head by reciprocation of energy between the inductor and capacitance. Once the magnetic field is reversed, current is supplied to the inductor for maintaining the field until the next field reversal, the reversal times being determined by the data to be written.

REFERENCES:
patent: 3521294 (1970-07-01), Treves
patent: 4712203 (1987-12-01), Saito et al.
patent: 4805043 (1989-02-01), Doyle
patent: 4872078 (1989-10-01), Gerber et al.
patent: 4907211 (1990-03-01), Horimai et al.
Nakao, et al., "High Speed Overwritable Magneto-Optic Recording", Japanese Journal of Applied Physics, vol. 26 (1987) Supplement 26-4, pp. 149-154.

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