Patent ID: 6674045
Filing Date: 2004-01-06
Classification: B23K,G02B

Abstract:
A galvanometer controlling apparatus comprising:a galvanometer for scanning a laser beam; an optical unit receiving a scanned laser beam from the galvanometer to lead the scanned laser beam for a workpiece; a position sensor for sensing a scanning position of the galvanometer to deliver a sensed signal; processing means receiving a digital command signal from a an upstream stage and the sensed signal from the position sensor for processing the digital command signal with the sensed signal to deliver a digital driving signal for the galvanometer; a D/A converter for converting the digital driving signal into an analog signal; an amplifier for amplifying the analog signal and supplying an amplified analog signal to the galvanometer, wherein the processing means includes a correction circuit for correcting scanning performed by the galvanometer, and the correction circuit is formed in a digital circuit; and a temperature detector to produce a temperature signal, wherein the correction circuit corrects an error due to characteristic change of the galvanometer depending on temperature change, in response to the temperature signal.