Automatic throat height control for film heads

Details Automatic throat height control for film heads Automatic throat height control for film heads

1982-05-07

1985-04-16

Wolff, John H.

Dynamic magnetic information storage or retrieval

Head

Core

360122, 29603, 51281R, G11B 516

Patent

active

045119422

ABSTRACT:
A lapping guide is provided to determine the position at which lapping of a thin film head to define pole faces should be terminated. Accurate positioning of the lapping guide with respect to the head is insured by forming various elements of the lapping guide during the same photolithographic process steps as those used to form elements of the head. The lapping guide may be used either as an electrical or optical guide. When used as an optical guide, a second lapping guide may be provided as an indicator that more frequent inspection is necessary.

REFERENCES:
patent: 3787638 (1974-01-01), Murai
patent: 3821815 (1974-06-01), Abbott
patent: 4155106 (1979-05-01), Muraoka et al.
patent: 4295173 (1981-10-01), Romankiw

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