Photomagnetic recording apparatus recording with alternating mag

Details Photomagnetic recording apparatus recording with alternating mag Photomagnetic recording apparatus recording with alternating mag

1991-01-15

1994-01-11

Nguyen, Hoa T.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360114, G11B 1304, G11B 1110, G11B 1112

Patent

active

052788091

ABSTRACT:
A photomagnetic recording apparatus, which has an optical head which has a light beam generating device for generating a fixed intensity light beam, and an optical system for condensing and irradiating the light beam onto a photomagnetic recording medium. The optical head is arranged on a first side of the medium. A recording magnetic biasing field generating device is arranged on the second side opposite to the first side of the medium. The device includes a first magnetic field generating device having a series resonant circuit having a head coil and a capacitor connected in series to each other. A driving signal feeding device feeds the series resonant circuit with an exciting signal synchronized with the resonant frequency of the series resonant circuit, to generate a first magnetic field to the medium. A suppressing controlling device is connected to the series resonant circuit for suppressing or non-suppressing the resonant characteristic of the series resonant circuit in accordance to a recording signal corresponding to recorded information, by suppressing or non-suppressing the current flowing through the coil. A second magnetic field generating device generates a second D.C. magnetic field, directed reversely to the direction of the first generated magnetic field.

REFERENCES:
patent: 4712203 (1987-12-01), Saito et al.
patent: 4907211 (1990-03-01), Horimai et al.
patent: 4937882 (1990-06-01), Omori et al.
patent: 4959820 (1990-09-01), Horimai et al.
patent: 5121369 (1992-06-01), Makansi

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