Esec, Trading Sa

Unaxis International Trading Ltd

Martin Melzer

Michael Mayer

A Wire Bonder contains a bondhead and a rocker arranged on the bondhead that is rotatable on a horizontal axis. A horn with a flange is attached to the rocker in which a capillary is clamped. At least one sensor is attached to the bondhead that detects vibrations of the bondhead and at least one actuator is arranged between the flange and the rocker that enables movement of the horn relative to the rocker. From an output signal delivered by the at least one sensor, a control device calculates a control signal for the at least one actuator and drives the at least one actuator in order to eliminate or at least reduce vibrations of the horn. The at least one sensor is preferably arranged on the rocker and is preferably an acceleration sensor.

Wire bonder

A device for measuring the oscillation amplitude of the tip of a capillary by means of a light beam comprises a light source and an opto-receiver and two apertured diaphragms that are arranged between the light source and the opto-receiver and which lie on a common axis. The apertured diaphragms are preferably formed by means of drill holes arranged on a common axis in side walls of a channel formed in a body. The two apertured diaphragms define the diameter of the light beam.

Device for measuring the amplitude of the tip of an oscillating capillary

In order that, on wire bonding by means of a Wire Bonder, optimum bonding results can be achieved after a capillary change it is suggested that, after a change from a first capillary to a second capillary, the ultrasonic transducer which applies ultrasonics to the horn which guides the capillary is controlled with a parameter P which results from the parameter P before the capillary change as P &equals;g(k , k )*P or P &equals;g(k , k , A , A )*P or P &equals;g(k , k , A , A , H , H )*P , whereby the quantities k and k designate the estimated values for the flexural strength, the quantities A and A the amplitudes of the freely oscillating capillary and H and H the diameters in the narrowest part of the longitudinal drill hole of the first or second capillary and whereby the function g is a predetermined function.

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Steinhausen, Switzerland

Martin Melzer