Modulated magnetic field generation circuit for magneto-optical

Details Modulated magnetic field generation circuit for magneto-optical Modulated magnetic field generation circuit for magneto-optical

1993-05-28

1994-12-27

Pascal, Robert J.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360114, G11B 1110

Patent

active

053771729

ABSTRACT:
A modulated magnetic field generation circuit is used in a disk recording apparatus which can overwrite data on a magneto-optical disk. The modulated magnetic field generation circuit includes a first coil for applying the magnetic field modulated for recording to the magneto-optical disk, a second coil for storing the energy used to reverse the direction of the current flowing to the first coil, a current limiter for limiting the current flowing to the second coil, and switching elements for changing the direction of the current flowing to the second coil to the first coil. Thus, a high frequency modulated magnetic field is generated with low power consumption and low voltage.

REFERENCES:
patent: 4937802 (1990-06-01), Omori et al.
patent: 4979158 (1990-12-01), Yoda
patent: 5020041 (1991-05-01), Nakao et al.
patent: 5157641 (1992-10-01), Lehureau
patent: 5189567 (1993-02-01), Mody
patent: 5199010 (1993-03-01), Adachi et al.
patent: 5220467 (1993-06-01), Zucker
patent: 5229902 (1993-07-01), Zucker et al.

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