Patent ID: 8866952
Filing Date: 2014-10-21
Classification: G02B,H04N

Abstract:
1. 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