Compact hand-held demagnetizing device

Details Compact hand-held demagnetizing device Compact hand-held demagnetizing device

1978-11-01

1980-08-19

Miller, J. D.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Systems for magnetizing, demagnetizing, or controlling the...

361151, 361142, H01F 1300

Patent

active

042187222

ABSTRACT:
A compact hand-held demagnetizing device is used for demagnetizing a magnetic recording and reproducing head. It comprises a handle portion and a demagnetizing head. The handle portion contains a circuit for generating a decreasing alternating current for exciting a drive coil for the demagnetizing head. Means is provided to indicate the time when the demagnetizing operation is initiated or when the demagnetizing operation can be initiated and when the demagnetizing operation is completed.

REFERENCES:
patent: 2528446 (1950-10-01), McConnell
patent: 3038036 (1962-06-01), Young et al.
patent: 3435300 (1969-03-01), Sato
patent: 3626255 (1971-12-01), Littwin
patent: 4086644 (1978-04-01), Horian et al.

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