Bias magnetic field abnormality detecting apparatus which contro

Details Bias magnetic field abnormality detecting apparatus which contro Bias magnetic field abnormality detecting apparatus which contro

1988-02-29

1990-12-18

Levy, Stuart S.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360114, 360 59, G11B 1112, G11B 1304

Patent

active

049791583

ABSTRACT:
The bias magnetic field abnormality detecting apparatus is used in a photomagnetic recording and reproducing apparatus for recording information on a recording medium or for reproducing and erasing the information from the recording medium and is provided with a field magnetic coil generating a magnetic field in the reverse direction at the time of recording and erasing information but generating no magnetic field at the time of reproducing information. A magnetic field detecting circuit detects the polarity of at least the magnetic field of the field magnetic coil and detects whether the magnetic field is abnormal or not. A writing in protecting circuit prohibits the recording and erasing operations by the output of the magnetic field detecting circuit.

REFERENCES:
patent: 4712203 (1987-12-01), Saito et al.
patent: 4733385 (1988-03-01), Henmi
patent: 4748606 (1988-05-01), Naito et al.

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