Thermal compensation for head protrusion in a magnetic drive

Dynamic magnetic information storage or retrieval – Fluid bearing head support – Disk record

Reexamination Certificate

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Reexamination Certificate

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06842308

ABSTRACT:
A head for a magnetic drive that includes a substrate with a thermal expansion rate CTE1. A transducer in the head has a bond to the substrate and has a transducer thermal expansion rate CTE2that is greater than CTE1.A restraint layer in the substrate has a bond to one side of the transducer and has a first restraint layer thermal expansion rate CTE3that is lower than CTE1.The restraint layer restrains protrusion of the transducer beyond the substrate at higher operating temperatures.

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