Patent ID: 8118500

Claim:
A vibrating device comprising: a dust-screening member shaped like a plate as a whole, having front and back surfaces and having a light-transmitting region for transmitting light between the front surface and the back surface; a support member configured to support the dust screening member, thereby to render the back surface of the dust-screening member airtight; a first vibrating member shaped almost like a rectangle, arranged at a first outer circumferential part of the dust-screening member and composed of a first vibration application part configured to expand and contract when supplied with an electrical signal for expanding and contracting and a first non-vibration application part configured not to supplied with the electrical signal for expanding and contracting; a second vibrating member shaped almost like a rectangle, arranged at a second outer circumferential part of the dust-screening member, which opposes the first outer circumferential part of the dust-screening member, and composed of a second vibration application part configured to expand and contract when supplied with the electrical signal for expanding and contracting and a second non-vibration application part configured not to supplied with the electrical signal for expanding and contracting; a connect member composed of a first circuit, second circuit and a connection part, the first circuit configured to input an electrical signal to the first vibration application part, the second circuit configured to output, from the second vibration application part, an electrical signal generated in the second vibration application part based on a vibration of the first vibration application part when an electrical signal is input to the first circuit, and the connection part configured to connect the first and second circuits electrically; and a drive unit configured to drive the first and second vibrating members while the first and second circuits remain connected by the connection part, wherein the first and second vibrating members are shaped symmetrically to one another in weight balance with respect to a virtual symmetry axis at the same distance from the first and second vibrating members and also to an virtual centerline connecting gravity centers of the first and second vibrating members, and the second vibrating member which receives the vibration has a vibrational axis and is shaped asymmetrically in vibrational amplitude with respect to the vibrational axis.