Patent ID: 8180215
Filing Date: 2012-05-15
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 to the X-axis that is a given axis of symmetry; 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; and a ratio between a first bending rigidity along the X-axis of at least the dust-screening member and vibrating member in the section orthogonal to the X-axis at the intersection of the X- and Y-axes, to a second bending rigidity along the Y-axis of at least the dust-screening member in the section orthogonal to the Y-axis at the intersection is 0.4 or more, but less than 1.0, the Y-axis being orthogonal to the X-axis in a virtual rectangle which has the same area as the surface of the dust-screening member, and which has long sides including the one side of the dust-screening member.