Electromagnet coils having a different inductance during magneto

Details Electromagnet coils having a different inductance during magneto Electromagnet coils having a different inductance during magneto

1994-06-29

1995-09-05

Epps, Georgia Y.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360114, G11B 1304

Patent

active

054485380

ABSTRACT:
In a magneto-optical recording/reproducing apparatus in which a signal is recorded by the magnetic field modulation system and which has a device for applying an external magnetic field at the time of reproduction, the apparatus has an external magnetic field generating electromagnet commonly used for recording and reproducing, the inductance of a coil in the electromagnet at the time of reproduction is larger than the inductance of the coil at the time of recording. In another magneto-optical recording/reproducing apparatus in which a signal is recorded by the magnetic field modulation system and which has a device for applying an external magnetic field at the time of reproduction, the apparatus has an external magnetic field generating electromagnet having an electromagnet coil wound around a magnetic core and commonly used for recording and reproducing, and another external magnetic field generating device capable of being magnetically coupled with the magnetic core of the electromagnet and decoupled therefrom. At the time of recording, a signal is recorded by the magnetic field modulation by energizing the electromagnet while the other external magnetic field generating device is magnetically decoupled from the electromagnet, while at the time of reproduction, the other external magnetic field generating device is magnetically coupled with the electromagnet.

REFERENCES:
patent: 5157641 (1992-10-01), Lehureau
patent: 5229902 (1993-07-01), Zucker et al.
patent: 5313444 (1994-05-01), Ishii et al.
patent: 5329408 (1994-07-01), Fuji
patent: 5351155 (1994-09-01), Ishii

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