Patent ID: 8783545

Claim:
A method for quality control during ultrasonic bonding by assessing the quality of a bond and/or by influencing bonding, which comprises providing a transducer and a bonding tool; providing an ultrasonic generator connected to the transducer and the bonding tool; conducting bonding operations using the transducer and the bonding tool; recording measurement signals for at least one parameter using sensors, wherein the at least one parameter can vary during the bonding operations; recording learning data for the at least one parameter, the learning data comprising the measurement signals recorded during a number of the bonding operations which comprise a learning phase; storing the learning data in a memory as at least one learning profile; determining a probability density function from the at least one learning profile; determining a maximum value of the probability density function; generating a characteristic expectation curve using the maximum value; and storing the characteristic expectation curve as a learned setpoint profile for the associated parameter, further comprising providing the each learned setpoint profile to a bonding reference system; storing the each measurement signals in the memory or another memory as an actual profile for the associated parameter; determining a deviation profile for the at least one parameter using the actual profile for that parameter and the learned setpoint profile for that parameter, and controlling and/or regulating bonding operations in progress or subsequently carried out using the at least one deviation profile to thereby control the quality of the ultrasonic bonding.