Method of making an integrated magnetic head having pole-pieces

Details Method of making an integrated magnetic head having pole-pieces Method of making an integrated magnetic head having pole-pieces

1976-12-08

1978-03-14

Hall, Carl E.

Metal working

Method of mechanical manufacture

Electrical device making

360119, G11B 542

Patent

active

040783006

ABSTRACT:
The invention concerns an integrated magnetic head adapted to cooperate with a track of a very narrow width, f.i. of about 20 microns, of a recording medium which moves perpendicularly to said width in close proximity to the frontal gap face of the head. The frontal width of the pole-piece layers of the head is reduced after said layers have been formed with a larger width adapted to a normal electromagnetic efficiency of the head in the parts of the said pole-pieces which encase the front branch of its flat conductor winding coil. The reduction is obtained by removal of the lateral parts of the pole-pieces over a predetermined depth with respect to the frontal face. Any registering part of an intervening dielectric layer between the pole-piece layers for defining the magnetic gap of the head is simultaneously removed. It is important that the removal be made by an attack such as a ionic erosion process perpendicularly oriented to the frontal plane of the head. The depth of removal may be of the order of 5 to 6 microns when the reduced width must be about twenty microns and when, further, the ratio of the overall thickness of the pole-piece layers and intervening layer at the frontal face of the gap to the said reduced width is higher than two.

REFERENCES:
patent: 3344237 (1967-09-01), Gregg
patent: 3514851 (1970-06-01), Perkins et al.
patent: 3633274 (1972-01-01), Miyata
patent: 3706926 (1972-12-01), Barrager et al.
patent: 3787964 (1974-01-01), Simon et al.
patent: 3846842 (1974-11-01), Lazzari

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