公开(公告)号：US20200144939A1

公开(公告)日：2020-05-07

申请号：US16733258

申请日：2020-01-03

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Katsumi FUJIMOTO ,  Chikahiro HORIGUCHI ,  Yasuhiro KURATANI ,  Satoshi ICHIHARA ,  Kiyoyuki MIYAZAWA

IPC: H02N2/02 ,  G03B17/08 ,  G03B17/56 ,  H04N5/225

Abstract: A method of driving a vibration device including a light-transmitting body and a piezoelectric element connected to the light-transmitting body is provided to vibrate the light-transmitting body. The method atomizes and removes liquid drops sticking to the light-transmitting body. A driving voltage to vibrate the piezoelectric element is swept at a sweep speed in a range of about 1 Hz to about 50 Hz so as to sweep a vibration frequency of the piezoelectric element to cover a frequency range including both of a resonant frequency of the light-transmitting body without liquid drops sticking to the light-transmitting body and a resonant frequency of the light-transmitting body with the liquid drops sticking to the light-transmitting body.