Patent ID: 9252686
Filing Date: 2016-02-02
CPC Classification: H02N

Claim Text:
1. A drive control method for a vibrator, comprising activating the vibrator, the vibrator comprising an electro-mechanical energy conversion device, wherein a driven part is in contact with the vibrator, and a relative position of the driven part and the vibrator is changed by providing a drive signal to the vibrator, the method comprising: applying as a drive signal a first drive signal having a first frequency to the vibrator; after applying the first drive signal, applying as the drive signal a second drive signal having a second frequency to the vibrator; and providing a time period throughout which the drive signal is made to be in an off state between the application of the first drive signal and the application of the second drive signal, wherein the relative position of the driven part and the vibrator remains at a first relative position during the application of the first drive signal and the time period throughout which the drive signal is made to be in the off state, and wherein the vibrator enters into a drive state, and the relative position of the driven part and the vibrator changes to a second relative position, after applying the second drive signal.