Magnetic erasing head

Details Magnetic erasing head Magnetic erasing head

1982-12-13

1986-09-23

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Head

Erase

360110, G11B 512

Patent

active

046139192

ABSTRACT:
A magnetic erasing head for erasing a magnetic recording media such as magnetic tape. The device has a head surface defined to make sliding contact with the tape surface. The head surface includes a permanent magnet material and a high permeability material. The permanent magnet material defines the portion of the head surface extending from the inlet side toward the exit side thereof for the sliding tape and is magnetized to include portions which have alternate polarities and which have a field strength which gradually decrease from the inlet side to the exit side of the head surface. The high permeability material defines a portion of the head surface with a predetermined length from the exit side toward the inlet side and with a width of about one-half of the recording track of the tape. The high permeability material is positioned substantially in alignment with the center of the recording track. Thus, the magnetic tape erased by the erasing head does not induce secondary harmonic distortion due to mutual cancellation of residual magnetism.

REFERENCES:
patent: 3772471 (1973-11-01), Imai et al.

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