Dynamic magnetic information storage or retrieval – Head – Core
Patent
1993-06-11
1994-06-28
Tupper, Robert S.
Dynamic magnetic information storage or retrieval
Head
Core
360119, 360122, G11B 5187, G11B 531, G11B 523
Patent
active
053252543
ABSTRACT:
A thin film magnetic head having a yoke structure comprising a pair of legs, a low reluctance back gap and a high reluctance front gap. The front gap is defined by the pole faces of pole tips which each have a cross-sectional area, in a plane paralleling the pole faces, for limiting magnetic saturation in the yoke structure to regions in the pole tip at and/or adjacent to the front gap. The pole tips define a short throat at the front gap to increase flux density at the gap and each yoke end face or pole tip has a thickness measured in the direction across the front gap which is greater than the thickness of either leg.
REFERENCES:
patent: 2813932 (1957-11-01), Kornei
patent: 4819111 (1989-04-01), Keel et al.
patent: 4853815 (1989-08-01), Diepers
patent: 4951166 (1990-08-01), Schewe
patent: 5130877 (1992-07-01), Hsie et al.
IBM Tech. Disk. Bul. vol. 31, No.3, Aug. 1988 "Film Head Structure Optemized For Writing" pp. 291-292 *The whole document*.
Pat. Abstracts of Japan, vol. 1, No. 129, (E-058)25, Oct. 1977, and JPA-52-063711 (Hitachi Seisakusho K. K.) May 26, 1977 *Abstract*.
Hewlett--Packard Company
Oberheim E. F.
Tupper Robert S.
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