| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a compact vibrating device capable of increasing a vibrational amplitude even by using a non-circular dust-screening member. Ž<P>SOLUTION: A piezoelectric element 120a provided to a dust-screening filter 119 being 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, and making the dust-screening filter produce vibration having a vibrational amplitude perpendicular to a member surface of the dust-screening filter is driven so as to make the dust-screening filter produce vibration Z(x, y) expressed as follows: Z(x, y)=Wmn(x, y)×cos(γ)+Wnm(x, y)×sin(γ) (where Wmn(x, y)=sin(nπ×x+π/2)×sin(mπ×y+π/2), Wnm(x, y )=sin(mπ×x+π/2)×sin(nπ×y+π/2), and λ=+π/4 or λ=-π/8 to -π/4) where Z(x, y) is vibration at a given point P(x, y) on the dust-screening filter, and (m) and (n) are positive integers including 0, indicating the order of natural vibration corresponding to a vibrational mode. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
|
