Method of making thin film induction recording head having an in

Details Method of making thin film induction recording head having an in Method of making thin film induction recording head having an in

1998-03-04

1999-08-10

Pianalto, Bernard

Coating processes

Electrical product produced

Coil or winding

20419234, 20419235, 360126, 427130, 427131, 427264, 427265, 427270, 427271, 427331, B05D 512

Patent

active

059356448

ABSTRACT:
The present invention uncouples the dependence between the zero throat height and the flare point of a write head by recessing the first insulation layer within the first pole piece layer. The first pole piece layer and the first insulation layer have planar surfaces which preferably lie in a common plane, the zero throat height being defined at the point where the planar surface of the first pole piece layer first meets the planar surface of the first insulation layer within the head. It is also at this point that the first and second pole piece layers separate from one another. Accordingly, the zero throat height can be accurately placed relative to the stripe height of a magneto-resistive (MR) sensor. Further, when a photoresist layer is spun onto the partially completed head for the construction of the pole tip of the second pole piece light directed into the photoresist layer for photo-imaging the pole tip does not reflect into the photoresist layer adjacent the pole tip. Accordingly, there is substantially no reflective notching of the photoresist layer because of the flatness of the surfaces of the first pole piece layer and the first insulation layer thereby permitting construction of a well defined second pole tip.

REFERENCES:
patent: 4353102 (1982-10-01), Kanai et al.
patent: 4422117 (1983-12-01), Nomura et al.
patent: 4490760 (1984-12-01), Kaminaka et al.
patent: 4636420 (1987-01-01), Wada et al.
patent: 4745506 (1988-05-01), Nakamura et al.
patent: 4875987 (1989-10-01), Wada et al.

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