Thin film magnetic head with a center tap

Details Thin film magnetic head with a center tap Thin film magnetic head with a center tap

1976-04-05

1977-08-23

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Head

Coil

360121, 360125, G11B 520, G11B 528

Patent

active

040443949

ABSTRACT:
A narrow track width magnetic head can be formed using an integrated circuit formation techniques such as evaporation plating, chemical etching, etc. But, there has been such a problem that it is difficult to provide a center tap in a conventional thin film magnetic head structure including coils of four or more turns. A magnetic head according to the present invention comprising a coil divided into two sections by the center tap, the electrostatic capacitance of each section being substantially the same. The coil may be formed into a precise pattern with ease by photoetching technique. A plurality of sets of conductive films insulated from one another are provided crossing a magnetic core, each set consisting of two conductive films of the same pattern. The alternating layers of the conductive films are connected on the backward of a magnetic gap to provide the two sections of the coil. A center tap is derived from a connection portion of the two sections of the coil and a coil terminal is provided at each of the opposite free ends of the coil. Thus, the thin film magnetic head having a multi-turn coil with a center tap is provided.

REFERENCES:
patent: 3344237 (1967-09-01), Gregg
patent: 3639699 (1972-02-01), Tiemann
patent: 3846841 (1974-11-01), Lazzari et al.
patent: 3867368 (1975-02-01), Lazzari
patent: 3891995 (1975-06-01), Hanazono et al.
IBM Tech. Disc. Bulletin, E. Max, Thin-Film Magnetic Head, vol. 13, No. 1, June 1970, pp. 248-249.

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