Patent ID: 9048760
Filing Date: 2015-06-02
Classification: H02N

Abstract:
1. A driving unit of a vibration-type actuator, wherein the vibration-type actuator is configured to generate a driving force by exciting a vibrating body, having at least an electro-mechanical energy conversion element, in a predetermined vibration mode by applying an alternating current (AC) signal to the electro-mechanical energy conversion element, the driving unit comprising: a command unit configured to output a command signal that directs at least one of a frequency, an amplitude, and a phase difference of an AC signal; a change making unit configured to make a change to the command signal and output a changed command signal; an AC signal generating unit configured to generate a generated AC signal in which at least one of a frequency, an amplitude, and a phase difference of the generated AC signal is modulated in accordance with the output of the change making unit; and a filter unit configured to damp a first frequency component and a second frequency component of output signals of the AC signal generating unit, wherein a frequency of vibration in the predetermined vibration mode is between a first frequency of the first frequency component and a second frequency of the second frequency component.