| 摘要 |
<p>PURPOSE: To increase the scanning speed by controlling a scanning motor by a motor control means provided with an energizing means, which energizes the shaft to the center position, and a driving means which repeatedly turns the shaft against the energizing force of the energizing means. CONSTITUTION: A motor control means 94 is provided with the driving means which gives an alternating magnetic field to a rotor 120 to repeatedly turn the rotor 120 in one direction from the rotor center position and the reverse direction against the energizing force of an energizing means 140, and the rotor 120 is rotated in each direction by an angle smaller than 360. Consequently, the rotor 120 of a scanning motor 68, a shaft 72, and a light reflection means 76 on the shaft 72 are energized to the center position by the energizing means 140, and the rotor 120 is repeatedly rotated against this energizing action when the motor control means 94 is operated. Thus, the speed of scanning for read is increased in comparison with a scanning means where the motor 68 is rotated in one direction.</p> |
