Patent ID: 8866952

Claim:
A dust removing device comprising at least: a first piezoelectric element and a second piezoelectric element each including a piezoelectric material and electrodes provided on the piezoelectric material; and a vibrating member on which the first piezoelectric element and the second piezoelectric element are provided, wherein the dust removing device removes dust from a target surface of the vibrating member by generating vibrations at least at a wavelength λ in the vibrating member by applying alternating voltages to the first piezoelectric element and the second piezoelectric element, respectively, wherein the first piezoelectric element is provided on a first surface of the vibrating member that is on a side having the target surface, and the second piezoelectric element is provided on a second surface of the vibrating member that is opposite the first surface, and wherein, when the first piezoelectric element and the second piezoelectric element are projected in a direction that is normal to the target surface, a distance dL 1 between a vibration generating end of the first piezoelectric element and a vibration generating end of the second piezoelectric element is expressed in the form dL 1 >0, where dL 1 ≠nλ/2 and n is a positive integer.