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Thin Film Transducer Protection

IP.com Disclosure Number: IPCOM000082758D
Original Publication Date: 1975-Feb-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Barkley, JA: AUTHOR [+3]

Abstract

Electrostatic charges which may be picked up by thin-film transducers, and which could damage the device, are instead harmlessly discharged.

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Thin Film Transducer Protection

Electrostatic charges which may be picked up by thin-film transducers, and which could damage the device, are instead harmlessly discharged.

A small, delicate transducing element, such as a single-turn, magnetoresistive or Hall element, can pick up very high voltage and current electrostatic potentials from external sources. To prevent damage, grounded layers of relatively conductive material surround the element and extend to the head's surface closest to the media. Possible materials are aluminum, copper, gold and tin. A capacitive chip having a typical value in the range of 1,000 to 50,000 picofarads is connected across the element leads.

In operation, charges are discharged to ground from the head through the conductive layers surrounding the element. High-frequency currents, particularly those resulting from sudden discharge, bypass the element through the capacitor.

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