Methods of making magnetic recording heads

Details Methods of making magnetic recording heads Methods of making magnetic recording heads

1981-10-09

1984-01-17

Hall, Carl E.

Metal working

Method of mechanical manufacture

Electrical device making

360121, G11B 542

Patent

active

044257015

ABSTRACT:
A method for making magnetic recording heads suitable for mass production with high accuracy.
The track width tw or w of the head core is defined by a photolithographic etching method.
First, larger grooves are formed by mechanical machining or electrolytic etching to form an outline of the pole piece parts, and then further smaller and shallower grooves are formed with very high accuracy by an etching process, such as electrolytic etching, sputter etching or ion etching at the edges of the first grooves. Thus, the track width of the head core is accurately determined by means of a photolithographic process.

REFERENCES:
patent: 3514851 (1970-06-01), Perkins et al.
patent: 3593414 (1971-07-01), Beun et al.
patent: 3845550 (1974-11-01), Gooch et al.
patent: 4017965 (1977-04-01), Brutsch et al.
patent: 4188247 (1980-02-01), Ridgway et al.
patent: 4192985 (1980-03-01), Berghof et al.

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