Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1988-09-28
1990-04-10
Rose, Robert
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
5116577, 29603, B24B 4900
Patent
active
049148680
ABSTRACT:
A lapping control system for a row of thin film magnetic transducers formed on a substrate. Each of the magnetic transducers comprises a magnetoresistive (MR) element, and the row is supported on a holder which has an elongated H-shaped slot near one edge to form a beam member upon which the row is mounted. The beam member is capable of being deflected in a substantially quadratic curvature when subjected to pressure from a pressure transducer at the middle of the beam member. The resistance of each of the MR elements is measured during lapping, and a control signal is generated to control the pressure transducers to control lapping with proper BALANCE and BOW and to terminate lapping when the desired MR element height is reached.
REFERENCES:
patent: 3702042 (1972-11-01), Cochran et al.
patent: 4457114 (1984-07-01), Hennenfent
patent: 4689877 (1987-09-01), Church
"Correction of Bowing of Magnetic Head Rows", M. A. Church, IBM Technical Disclosure Bulletin, vol. 24, No. 1A, Jun. 1981.
Church Mark A.
Deshpande Annayya P.
Desouches Alain M.
Pal George S.
Salo Michael P.
International Business Machines - Corporation
Rachuba M.
Rose Robert
Schmid, Jr. Otto
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