DC erase head

Details DC erase head DC erase head

1978-05-04

1980-02-05

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Head

Erase

360 66, 361151, G11B 502, G11B 547

Patent

active

041875214

ABSTRACT:
An erase head for erasing single tracks on multi-track magnetic recording tapes by means of a constant magnetic field applied in a direction perpendicular to the direction of tape travel, to avoid any asymmetrical residual magnetization with respect to the direction of a magnetizing field used for recording. A configuration of two pole pieces and two corresponding shields, spaced out from the pole pieces and generally coplanar with the end faces thereof, ensures that the magnetic field strength is relatively uniform in a region between the shields, and falls to a relatively low value outside this region.

REFERENCES:
patent: 2736776 (1956-02-01), Camras
patent: 3105965 (1963-10-01), Joannou
patent: 3521006 (1970-07-01), Michael
patent: 3542971 (1970-11-01), Willard
patent: 3852812 (1974-12-01), Reisfeld
patent: 4038692 (1977-07-01), Umeda et al.
IBM Tech. Disc. Bull., L. E. Ambrico, Undiased Erasure, vol. 9, No. 7, Dec. 1966, p. 764.

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