VIBRATION-TYPE DRIVE DEVICE, ELECTRONIC APPARATUS, AND CONTROL METHOD OF VIBRATION-TYPE ACTUATOR

摘要

To avoid controllability from becoming unstable when switching between frequency control and pulse width control.SOLUTION: A vibration-type drive device 100 includes a vibration-type actuator 200 and a control device for controlling drive thereof. The control device includes signal generation units 10a and 10b for generating a switching pulse by switching DC voltage, an amplification unit for the switching pulse, and an MPU 11 for controlling the signal generation units 10a and 10b. The MPU 11 has functions as determination means for determining the maximum duty ratio of the switching pulse according to a value of the DC voltage, frequency control means for controlling the frequency of the switching pulse, pulse width control means for controlling the duty ratio of the switching pulse, and setting means for controlling gain in frequency control of the vibration-type actuator 200 and gain in pulse width control according to the determined maximum duty ratio so that control characteristics in the frequency control nearly correspond with control characteristics in the pulse width control.SELECTED DRAWING: Figure 9