Magnetic disc apparatus with thin film head suitable for high-de

Details Magnetic disc apparatus with thin film head suitable for high-de Magnetic disc apparatus with thin film head suitable for high-de

1992-10-19

1994-03-22

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

360 9801, 360125, 360119, G11B 5012

Patent

active

052969797

ABSTRACT:
A magnetic disc apparatus includes a magnetic disc for recording information; a thin film magnetic head including a magnetic pole structure having an upper magnetic pole tip and a lower magnetic pole tip arranged to provide a magnetic gap at respective end portions thereof for writing and reading information in and from the magnetic disc; a device for rotating the magnetic disc; and a device for positioning the thin film magnetic head; the upper and lower magnetic pole tips having different contours at the respective end portions as viewed from a side confronting the magnetic disc wherein the difference (.DELTA.CW in .mu.m) in the width, along the magnetic gap, of the upper magnetic pole tip and the width, along the magnetic gap, of the lower magnetic pole tip satisfies the relation

REFERENCES:
patent: 4219855 (1980-08-01), Jones, Jr.
patent: 4799118 (1989-01-01), Yamada et al.
patent: 4951166 (1990-08-01), Schewe
patent: 4970615 (1990-11-01), Gau
patent: 4970616 (1990-11-01), Ramaswamy
R. Jones, Jr., "IBM 3370 Film Head Design and Fabrication", IBM Disk Storage Technology, Feb. 1980, pp. 6-9.
J. Kishigami et al., "Three-Dimensional Stray Field Analysis on Film Heads", Shingaku Giho, vol. 85, No. 137, MR85-22, 1985, pp. 1-8 (with partial English translation).
M. Re et al., "Magneto-optic Determination of Magnetic Recording Head Fields", IEEE Transactions on Magnetics, vol. MAG-22, No. 5, Sep. 1986, pp. 840-842.
M. Hanazono et al., "Design and Fabrication of Thin-film Heads Based on a Dry Process (Invited)", Journal of Applied Physics, vol. 61, No. 8, Apr. 15, 1987, pp. 4157-4162.
Patent Abstracts of Japan, P-674, vol. 12, No. 74, Mar. 9, 1988 (for Japanese Kokai 62-212910).

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