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CN101770144B 振动装置及使用该振动装置的图像设备 有权 转让

振动装置及使用该振动装置的图像设备
摘要：
本发明提供振动装置及使用该振动装置的图像设备。作为防尘部件的防尘滤波器(119)整体形成为板状，并具有至少一条关于某个对称轴对称的边，压电元件(120a)设在防尘滤波器(119)上，使得产生具有与所述防尘滤波器的部件表面垂直的振动振幅的振动，该压电元件(120a)被驱动成为，在把所述防尘滤波器上的任意的点P(x，y)的振动设为Z(x，y)、把m和n设为与振动模式对应的固有振动的次数且是包含0的正整数时，产生利用下式表示的振动Z(x，y)：Z(x，y)＝Wmn(x，y)·cos(γ)+Wnm(x，y)·sin(γ)(其中，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)、γ＝+π/4或者γ＝-π/8～-π/4)。并且，防尘部件形成为如下的形状：该形状使得在具有相当于所述防尘部件具有的所述一边的长边、而且具有与所述防尘部件的部件表面的面积相同的面积的假想矩形(175)中，该假想矩形的短边的长度与长边的长度之比为0.9以上且小于1。
摘要（英）：

A piezoelectric element (120a) is secured to a dust filter (119) as 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, the piezoelectric element being driven to produce vibration Z (x, y) at the dust filter, the vibration being expressed as follows: Z(x, y)= Wmn(x, y).cos(Gamma)+Wnm(x, y)sin(Gamma) where Z (x, y) is vibration at a given point P (x, y) on the dust filter, m and n are positive integers including 0, indicating the order of natural vibration corresponding to a vibrational mode, Wmn(x, y)= sin(nPi.x+Pi/2) sin(mPiy+Pi/2), Wnm(x, y)= sin(mPi.x+Pi/2).sin(nPi.y+Pi/2), and Gamma=is +Pi/4 or ranges from -Pi/8 to -Pi/4. The dust filter is shaped such that the ratio of length of either short sideto either long side of a virtual rectangle (175) is 0.9 or more, but less than 1, the virtual rectangle having the same area as the dust filter and having sides including the one side which the dust filter has.

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