Patent ID: 8164634
Filing Date: 2012-04-24
Classification: B06B,G02B,G03B,H04N

Abstract:
1. A vibrating device comprising: a dust-screening member which is shaped like a plate as a whole and has at least one side that is symmetric with respect to a symmetry axis; a vibrating member secured to the dust-screening member and configured to produce, at the dust-screening member, vibration having a vibrational amplitude perpendicular to a surface of the dust-screening member; and a drive unit configured to drive the vibrating member to produce vibration Z(x,y) at the dust-screening member, the vibration being expressed as follows: where Z(x,y) is vibration at a given point P(x,y) on the dust-screening member; m and n are positive integers including 0, indicating the order of natural vibration corresponding to a vibrational mode; γ is +π/4 or ranges from −π/8 to −π/4, wherein the device has such a size that LP/LF is 0.5 or more, but less than 1, where LF is the length of the sides to which the vibrating member is arranged in a virtual rectangle having the same area as the surface of the dust-screening member and sides including the one side, and LP is the longitudinal length of the vibrating member of the sides parallel to the one side.