Method and apparatus for controlling the throat height of batch

Details Method and apparatus for controlling the throat height of batch Method and apparatus for controlling the throat height of batch

1986-07-15

1987-09-01

Goldberg, Howard N.

Metal working

Method of mechanical manufacture

Electrical device making

29407, 29705, 29707, 51165R, G11B 5127, B23Q 1700, B23Q 1500

Patent

active

046898778

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.

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IBM Tech. Discl. Bull., vol. 11, No. 12, May 1969, p. 1792, "Alignment of Read-Write Heads in Slides".
IBM Tech. Discl. Bull., vol. 23, No. 6, Nov. 1980, p. 2550, "Lapping Guides for Magnetic Heads".
IBM Tech. Discl. Bull., vol. 18, No. 1, Jun. 1975, p. 227, "Throat Height Control".

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