Browse Prior Art Database

Automatic Wire-Bonding Transducer Temperature Compensation

IP.com Disclosure Number: IPCOM000061597D
Original Publication Date: 1986-Aug-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Bosley, RC: AUTHOR [+5]

Abstract

This article describes a technique which will control the temperature of an automatic wire-bonding transducer so as to stabilize wire bond location repeatability on high volume long runs, lubricate a wire feed mechanism, and maintain a clear optical field free of heat radiation interference. Automatic wire bonders used in high volume long duration product runs in manufacturing exhibit wire bond location shifts over time due to transducer temperature changes. Periodic setup is required to control bond site registration. The figure shows an automatic wire bonder with feedback controls needed to maintain bonder site registration.

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Automatic Wire-Bonding Transducer Temperature Compensation

This article describes a technique which will control the temperature of an automatic wire-bonding transducer so as to stabilize wire bond location repeatability on high volume long runs, lubricate a wire feed mechanism, and maintain a clear optical field free of heat radiation interference. Automatic wire bonders used in high volume long duration product runs in manufacturing exhibit wire bond location shifts over time due to transducer temperature changes. Periodic setup is required to control bond site registration. The figure shows an automatic wire bonder with feedback controls needed to maintain bonder site registration. A transducer 10 is fabricated to include a hollow bore 11 along the axis of the transducer 10 which is used as a channel to pass nitrogen gas and a thermocouple 12 welded to the body of transducer 10 which provides the electrical input to control unit 13. Electrical output 14 of control unit 13 will control gas heater 15 (typically a serpentine heater), and output 16 of control unit 13 will adjust gas flow control unit 17. To stabilize the transducer temperature, a low nitrogen flow rate is maintained through the hollow bore 11. The gas exits through vent 18, clearing an optical field of heat radiation effects around the capillary and also forms a gas slide in the vicinity of gas deflector 19 to assist the wire-feeding mechanism. Transducer temperature feedback control is maintained...