Kulicke and Soffa Investments, Inc.

Quad Systems Corporation

Ali Reza Safabakhsh

John Joseph Kilgarriff

Valery Khelemsky

Charles S Kulicke

In a pick and place machine of the type having an X-Y movable bond head there is provided a vertically movable pick up tool in the bond head having a tip for picking up and placing a device. The tip of the bonding tool is mounted opposite a radiant heating element which is juxtaposed and separated from the tip of the bonding tool. The tip of the bonding tool is heated to a predetermined control temperature with the radiant energy heating element and during a bonding operation it incurs some cooling. The amount of cooling is calculated by the time and the length of the extension of the bonding tool from its heating element and a computer controller calculates a compensation factor over a predetermined fixed time which includes retracting the bonding tool tip a predetermined vertical distance into the heater to reheat the tool and compensate for the amount of cooling that occurred during the pick and place operation.

Contactless bonding tool heater

The present invention concerns a self locking system for holding a wire bonding tool in a wire bonding transducer and comprises an unitary cam key rotatably mounted in a cam key aperture extending through an anti-node end of an ultrasonic transducer. A cam surface on the cam key is operable to lock a bonding tool mounted in a substantially vertical bonding tool aperture when rotated less than 360.degree. in said cam key aperture.

Self locking key for ultrasonic transducers

A multi-resonance frequency ultrasonic transducer has a plurality of useful resonance frequencies for wire bonding operation and comprises an integral unibody with a rectangular aperture in the center of its mass. A multi-frequency stack of transducer drivers is mounted in the rectangular aperture with compression wedges. The length L of the stack of transducer drivers is equal to or less than one-quarter of one wavelength of the lower useful resonance frequency and the design envelopes for the useful frequencies embrace two or more useful fixed frequencies separated from spurious unusable frequencies by a minimum of two kilohertz.

Multi resonance unibody ultrasonic transducer

A low mounting impedance ultrasonic transducer for mounting on a bonding machine comprises a prior art type transducer having a modified mounting flange which includes one or more elongated apertures in the mounting flange or the transducer body to isolate transverse radial stress in the transducer body from entering into the mounting flanges and coupling to the bonding machine.

Self isolating ultrasonic transducer

A multi-resonance frequency ultrasonic transducer as a plurality of useful resonance frequencies for wire bonding operation and comprises an integral unibody with a rectangular aperture in the center of its mass. A multi-frequency stack of transducer drivers is mounted in the rectangular aperture with compression wedges. The length L of the stack of transducer drivers is equal to or less than one-quarter of one wavelength of the lower useful resonance frequency and the design envelopes for the useful frequencies embrace two or more useful fixed frequencies separated from spurious unusable frequencies by a minimum of two kilohertz.

A novel ultrasonic transducer comprises a machined solid metal unibody having a rectangular aperture in the center between a tool mounting end and a balanced end. The end portions are connected by two axial side members which connect to two transverse sides of the rectangular aperture. A stack of piezo electric crystals are mounted in said rectangular aperture between the transverse sides and spaced apart from the axial sides of the aperture. A bonding tool is mounted in a cylindrical aperture in the mounting end of the transducer and tightly mechanically coupled to the mounting end so that the stack of piezo electric crystals are acoustically coupled through the unibody to the bonding tool in a cylindrical aperture by a tightly coupled mounting surfaces.

Growing community of inventors

Yardley, PA, United States of America

Ali Reza Safabakhsh