Patent ID: 8559120
Filing Date: 2013-10-15
Classification: G02B,H02N

Abstract:
1. A control apparatus configured to control an actuator, which moves one driven member by a plurality of vibrators, by supplying two alternating-current signals to each vibrator of the actuator, the control apparatus comprising: a controller configured to acquire a speed of the driven member at the time of driving one or more vibrator(s) of the plurality of vibrators while setting the remaining vibrators to standing wave drive, acquire a speed characteristic of the driven member corresponding to the frequency of the alternating-current signal with respect to the vibrator(s) based on the acquired speed and the frequency of the alternating-current signal supplied to the vibrator(s) at the time of the acquisition of the speed, and reduce a difference in the characteristic among the plurality of vibrators by adjusting at least one of an amplitude of an alternating-current signal to be supplied to the vibrator, a frequency of an alternating-current signal to be supplied to the vibrator, and a phase difference between two alternating-current signals to be supplied to the vibrator, based on the acquired characteristic.