Magnetic head device for magneto-optical disc system and magneti

Details Magnetic head device for magneto-optical disc system and magneti Magnetic head device for magneto-optical disc system and magneti

1993-01-11

1995-04-04

Epps, Georgia Y.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360114, G11B 503

Patent

active

054043425

ABSTRACT:
A magnetic head driving circuit for driving a magnetic head device adapted for recording information signals on a magneto-optical disc by applying a magnetic field to the magneto-optical disc is disclosed. The magnetic head driving circuit includes a pair of switching elements for performing a push-pull operation in accordance with input recording signals, a pair of rectifiers connected in series with each other between the switching elements, a magnetic field generating coil having one terminal connected to a junction line between the rectifying elements via a coupling capacitance and having its other terminal grounded. The magnetic field generating coil generates a magnetic field by being supplied with a driving current corresponding to the recording signals. An amplifier capacitor is connected in parallel with the magnetic field generating coil in an ac path for amplifying the driving current supplied to the magnetic field generating coil. With the above-described magnetic head driving circuit, the driving current supplied to the magnetic head generating coil may be amplified to increase the strength of the magnetic field generated by the magnetic field generating coil. A magnetic head device is also disclosed which includes a substrate provided integrally with a magnetic core about which the magnetic field generating coil is wound and with the above-mentioned driving circuit for simplifying the structure and reducing the size of the head device.

REFERENCES:
patent: 4769724 (1988-09-01), Kusunoki et al.
patent: 4937802 (1990-06-01), Omori et al.
patent: 4979158 (1990-12-01), Yoda
patent: 5220467 (1993-06-01), Zucker
patent: 5229902 (1993-07-01), Zucker et al.
patent: 5293360 (1994-03-01), Hasegawa et al.
patent: 5305294 (1994-04-01), Kime et al.

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