Wire Bonding Force Monitoring Using Z-Height Feedback

The system performs preliminary calibration actions during dry cycle operations before actual production bonding. A calibration routine is executed that applies incremental bonding forces and measures corresponding z-height positions to establish a calibration curve, preparing the system for accurate bonding without requiring subsequent offline calibration.

The system continuously monitors the relationship between bonding force and z-height position during operations. By measuring the actual z-height position at applied bonding forces and comparing against the calibration curve, the system provides feedback to correct bonding force accuracy, compensating for drift due to environmental factors and machine operation time.

The system uses its own operational data to perform self-calibration and self-monitoring. During dry cycle operations, the bond head assembly itself is used to apply calibration forces and measure z-height positions, eliminating the need for external calibration equipment. The monitoring system leverages existing sensors and actuators to maintain bonding accuracy.

The bond head assembly serves multiple functions: it performs actual wire bonding operations during production and simultaneously performs calibration and monitoring functions during dry cycle operations. The z-height position detection system serves both positioning control and bonding force verification purposes, reducing the need for separate dedicated monitoring hardware.