Patent ID: 6614464
Filing Date: 2003-09-02
Classification: G02B,G06K

Abstract:
A laser scanning apparatus comprising:a scanning unit for scanning a laser beam; a receiver for receiving the laser beam and generating a BD signal; a measuring unit for measuring a scanning cycle of said scanning unit based on the BD signal generated by said receiver; a controller for controlling emission of the laser beam and controlling a motor of said scanning unit based on the scanning cycle measurement, wherein during a start-up period in which the scanning cycle of said scanning unit gradually shortens, said controller causes continuous emission of the laser beam for a first period during which the scanning cycle can be measured, predicts a time when a scanning speed of said scanning unit will reach a predetermined speed based on the scanning cycle measurement, terminates emission of the laser beam until the predicted time, and causes continuous emission of the laser beam for a second period during which the scanning cycle can be measured after the predicted time.