公开(公告)号：CA1249075A

公开(公告)日：1989-01-17

申请号：CA528223

申请日：1987-01-27

Applicant: IBM

Inventor： CHURCH MARK A

IPC: G01R31/28

Abstract: A method for determining the position of a lapped edge of a substrate during lapping of a row of thin film magnetic transducer elements. First and second electrical lapping guide structures are formed on each side of the row of transducer elements. The lapping guide structures include a series of switching junctions, each switching junction paralleled by a resistor. A lapping resistor which provides a change in resistance proportional to the lapping of the row is measured and compared with the position of the lapping plane as determined from each switching junction change of state. Calibration of the resistor versus lapping plane position is effected to permit an accurate determination of the lapped surface from subsequent resistance measurements of the lapping resistor.

公开(公告)号：CA1126402A

公开(公告)日：1982-06-22

申请号：CA339625

申请日：1979-11-13

Applicant: IBM

Inventor： CHURCH MARK A ,  JONES ROBERT E JR

IPC: G11B5/17 ,  G11B5/31 ,  G11B5/00

Abstract: THIN FILM MAGNETIC HEAD ASSEMBLY A thin film magnetic head assembly has a multi-turn electrical conducting coil, which is formed by deposition in an elliptical pattern. By virtue of the elliptical pattern, the coil turn portions between the back gap closure and transducing gap of the thin film head are relatively narrow, whereas the coil turn portions furthest from the transducing gap are widest. Corners and sharp ends are eliminated. Electrical resistance effects are thereby minimized and signal output is enhanced. SA978025

公开(公告)号：CA1261939A

公开(公告)日：1989-09-26

申请号：CA528222

申请日：1987-01-27

Applicant: IBM

Inventor： CHURCH MARK A

IPC: G08C21/00

Abstract: An electrical lapping guide resistor for measuring the lapping distance in a process for manufacturing thin film magnetic transducers. Final throat height is measured with an electrical lapping guide resistor which provides a linear change in resistance versus lapping distance. The lapping guide resistor is configured in a shape such that the effective length of the resistors increases as the effective width decreases. In a preferred embodiment of the invention, the resistor includes first and second converging edges which extend from a rearward edge parallel to the final throat height toward the lapping surface. Conductors are disposed along the converging edges. Measurements of the change in lapping distance are effected by measuring the distance between the conductors.

公开(公告)号：CA1191947A

公开(公告)日：1985-08-13

申请号：CA430701

申请日：1983-06-17

Applicant: IBM

Inventor： CHURCH MARK A ,  DECKER STEPHEN K

IPC: G11B5/31 ,  G11B5/265 ,  G11B5/39

Abstract: INTEGRATED MAGNETIC RECORDING HEAD ASSEMBLY INCLUDING AN INDUCTIVE WRITE SUBASSEMBLY AND A MAGNETORESISTIVE READ SUBASSEMBLY An integrated read/write head assembly incorporates a thin film inductive write head subassembly comprising first and second pole pieces that define a write transducing gap, and a magnetoresistive read subassembly disposed in the write gap. The first write pole piece is extended so as to provide a planar conductive path from the terminal connections or studs to the magnetoresistive read subassembly, thereby forming a uniform surface for deposition of the magnetoresistive read subassembly.