Patent ID: 9269149
Filing Date: 2016-02-23
CPC Classification: G03F,G06T

Claim Text:
1. An optical apparatus, comprising: a mount, which is configured to hold a workpiece; an array of optical heads, which are configured to project respective patterns of radiation onto the workpiece; a calibration assembly, which is configured to capture images of the respective patterns; a motion assembly, on which the calibration assembly is mounted, and which is configured to move the calibration assembly, with respect to the array of optical heads, among a plurality of different positions, each position disposed on an optical path between the array of the optical heads and the mount, so as to intercept and image, at each of the different positions, a respective pattern projected by a different one of the optical heads; and a processor, which is configured to process the images captured by the calibration assembly at the different positions so as to monitor operation of the apparatus.