Quality control method
AssigneeHesse & Knipps GmbH
InventorsHans Jürgen Hesse, Dietmar Holtgrewe
Life of this patent
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Abstract
A quality control method for ultrasonic wire bonding is provided wherein the deformation of the wire to be bonded to a contact surface is substantially constantly monitored. The method includes generating an ultrasonic output table. In the table, the current status of the bonding process is represented as a function of the gradient of deformation of the wire, the impedance of the transducer-bond wedge unit, as well as the currently reached deformation of the wire. The desired gradient of deformation of the wire, a function of the particular status of the process, is specified as the desired value. A correcting variable for the ultrasonic generator is calculated by the addition of correction values formed in the controller to the respective current table values.
Claims7
A quality control method for ultrasonic wire bonding, wherein a deformation of a wire to be bonded to a contact surface is substantially constantly monitored, comprising:
- generating an ultrasonic output table, representing a current status of the process in each case as a function of a gradient of deformation of the wire, an impedance of a transducer-bond wedge unit, as well as a currently reached deformation of the wire, wherein a desired gradient of deformation of the wire, as a function of a particular status of the process, is specified as a desired value, and wherein a correcting variable for the ultrasonic generator is calculated by an addition of correction values formed in the controller to the respective current table values.
A quality control method for ultrasonic wire bonding, wherein a deformation of a wire to be bonded to a contact surface is substantially constantly monitored, wherein during a learning phase an ultrasonic output table representing a particular current status of the process is created as a function of a gradient of deformation of the wire, an impedance of a transducer-bond wedge unit as well as a currently reached deformation of the wire, by means of the control parameterized by a neural network, where the ultrasonic output required for the particular status of the process is calculated by means of a fuzzy controller and in that ultrasonic levels determined by the neural network are fed to the ultrasonic generator on a closely specified cycle.
Dependencies are inferred from the claim text.