MONITORING SCAN MIRROR MOTION IN ELECTRO-OPTICAL READERS AND IMAGE PROJECTORS

摘要

Crosstalk between a drive coil (72, 240) and a primary feedback coil (210) is eliminated by positioning a secondary feedback coil (212) in proximity with the drive coil for contamination by the crosstalk to the same extent as the primary feedback coil (210), and by processing feedback signals generated by the feedback coils to cancel the crosstalk. The drive coil (72, 240) is used to oscillate a scan mirror (64) employed in an image projection arrangement (20) or an electro-optical reader (220).