Demagnetizer for a magnetic head of a recording-reproducing devi

Details Demagnetizer for a magnetic head of a recording-reproducing devi Demagnetizer for a magnetic head of a recording-reproducing devi

1977-07-20

1979-01-16

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Head

Head accessory

361149, 361267, 360137, G11B 546

Patent

active

041352190

ABSTRACT:
A demagnetizer for a magnetic head for a recording/reproducing device. The demagnetizer includes an electromagnet for producing an alternating magnetic field which gradually decreases in intensity. The demagnetizer is mounted in a case formed in the shape of a tape cassette. The electromagnet is resiliently held within the case adjacent to the opening for the magnetic head to be demagnetized. The electromagnet is energized by an oscillating drive circuit, the output of which is controlled by a capacitor.

REFERENCES:
patent: 2538893 (1951-01-01), Begun
patent: 2962560 (1960-11-01), Folse
patent: 3038036 (1962-06-01), Young et al.
patent: 3093774 (1963-06-01), Christianson et al.
patent: 3417306 (1968-12-01), Knak
patent: 3435300 (1969-03-01), Sato
patent: 3647990 (1972-03-01), Eul, Jr. et al.
patent: 3655924 (1972-04-01), Puskas
patent: 3721885 (1973-03-01), McKeown et al.

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