Foreign substance removing device and image pickup device

摘要

A dust removing device includes an oscillation body including at least an elastic member and an electromechanical energy conversion element which is fixed to the elastic member, wherein the electromechanical energy conversion element is configured to excite oscillation in the elastic member to remove dust. A rigidity-increasing member configured to enhance rigidity of the oscillation body in the direction of a node line of the oscillation is provided on at least one of the elastic member and the electromechanical energy conversion element.

主权项

1. A dust removing device, comprising
an oscillation body including at least an elastic member and an electromechanical energy conversion element which is fixed to the elastic member, wherein the electromechanical energy conversion element is configured to excite oscillation in the elastic member to remove dust; and a driving circuit configured to apply an alternating voltage to the electromechanical energy conversion element, wherein the alternating voltage is applied to excite oscillation in a first oscillation mode and oscillation in a second oscillation mode which are the same in direction of the node line and different in order, wherein a rigidity-increasing member configured to enhance rigidity of the oscillation body in the direction of the node line of the oscillation is provided on at least one of the elastic member and the electromechanical energy conversion element, and wherein the width of the rigidity-increasing member along a direction perpendicular to the node line is not larger than ½ of the wavelength of any one of the first oscillation mode and the second oscillation mode of the smaller order.