Video clock signal generator in an optical scanner in which a mask including a linear scale provides timing for controlling the amplitude of a vibrating mirror

摘要

A video clock signal generator comprises: a light beam source; a mask having opposite ends spaced by a predetermined distance; a vibration scanner for reflecting the light beam and forming a light spot vibrating on the mask beyond the opposite ends thereof; a detector for generating an output signal representing optical information from the mask; a counter for counting a time required for the light spot to cross the opposite ends of the mask based on the output signal of the detector; and a control unit for controlling an amplitude of the scanner mirror in accordance with the time counted by the counter.