Method of grinding core blank for magnetic heads, using markers

Details Method of grinding core blank for magnetic heads, using markers Method of grinding core blank for magnetic heads, using markers

1993-04-29

1994-04-26

Rose, Robert A.

Abrasive tool making process, material, or composition

With carbohydrate or reaction product thereof

51281R, 51165R, 51327, B24B 700, B24B 4904

Patent

active

053055594

ABSTRACT:
A method of grinding a core blank which yields at least one head core each used for a magnetic head, each head core having an annular magnetic path having a magnetic gap, the core blank having a working surface that is to be opposed to a magnetic recording medium is disclosed. According to the present grinding method, at least one marker is formed by photolithography so that the marker(s) is/are embedded in the core blank. Each marker has two edges which are spaced from each other in a direction of width of the magnetic gap, by a first distance that continuously varies in a direction of depth of the magnetic gap, the two edges of each marker being located on the same side as viewed in the gap-width direction. During grinding of the core blank, the first distance between the two edges of each marker which is exposed on the working surface under grinding is measured, so as to determine a required residual depth of grinding which is to be further effected to establish a nominal depth dimension of the magnetic gap.

REFERENCES:
patent: 3821815 (1974-06-01), Abbott et al.
patent: 4155106 (1979-05-01), Muraoka et al.
patent: 4511942 (1985-04-01), Valstyn
"Throat Height Determination Techniques for Inductive Heads"; Cheatham, et al.; IBM Technical Disclosure Bulletin; vol. 21, No. 9 (Feb. 1979).
"Polishing Apparatus"; Grandison; IBM Technical Disclosure Bulletin; vol. 13, No. 4 (Sep. 1970).
"Method For Reducing Grinding Damage in MR Heads"; Daughenbaugh, et al. IBM Technical Disclosure Bulletin; vol. 21, No. 9 (Feb. 1979).

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