Method for initializing a magneto-optical disk using a coil as a

Details Method for initializing a magneto-optical disk using a coil as a Method for initializing a magneto-optical disk using a coil as a

1989-11-08

1993-03-30

Nguyen, Hoa T.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, 360114, G11B 1304, G11B 1112, G11B 1110

Patent

active

051990105

ABSTRACT:
A method for initializing a magneto-optial disk comprises the steps of positioning at least one magneto-optical disk in a coil, wherein the length of said coil is shorter than the diameter thereof, so that the direction of the thickness of the magneto-optical disk coincides with the axial direction of the coil, and applying a predetermined pulsed current to the coil in order to generate an instantaneous magnetic field. The pulsed current is generated by a device comprising a charging circuit which charges a capacitor, and a discharging circuit, which applies a current to the coil, said current being generated by discharging the capacitor. A lifter supports the magneto-optical disk and conveys the magneto-optical disk in the direction of the thickness thereof in order to position it in the coil.

REFERENCES:
patent: 3486449 (1969-12-01), Levine
patent: 3879754 (1975-04-01), Balinger
patent: 4914532 (1990-04-01), Ohashi et al.
Fusao Fujimori, Yasashii Chotanpa No Oyo (Simple Application of Ultrasonic Wave), new ed., (Tokyo: Sanyo Shuppan, Jan. 25, 1982), pp. 91-93 and 221.

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