Patent ID: 8875979

Claim:
A bonding apparatus for performing bonding operations on semiconductor dies, the bonding apparatus comprising: a workchuck configured to support a semiconductor die carrier to which the semiconductor dies are bonded; a bondhead configured to perform the bonding operations on the semiconductor dies; and an alignment-determining apparatus configured to determine an alignment of the bondhead relative to the workchuck, the alignment-determining apparatus comprising: a sensor mount having opposite top and bottom ends; a first sensor mounted to the top end of the sensor mount and a second sensor mounted to the bottom end of the sensor mount, the first and second sensors being configured to measure distances; a positioning device coupled to the first and second sensors, the positioning device being configured to move the first sensor relative to a first plurality of locations on the bondhead facing the first sensor, and to move the second sensor relative to a second plurality of locations on the workchuck facing the second sensor, wherein the first sensor is operative to measure a first set of distances between each of the first plurality of locations on the bondhead and the first sensor, and the second sensor is operative to measure a second set of distances between each of the second plurality of locations on the workchuck and the second sensor, the first and second sets of distances being for determining the alignment of the bondhead relative to the workchuck.