公开(公告)号：US06925878B2

公开(公告)日：2005-08-09

申请号：US10909859

申请日：2004-08-02

Applicant: Hiroyuki Baba ,  Hideki Matsumoto

Inventor： Hiroyuki Baba ,  Hideki Matsumoto

IPC: G01L23/22 ,  G01P1/02 ,  G01P15/09 ,  G01L11/08

CPC classification number: G01P1/023 ,  G01L23/222 ,  G01P15/0922

Abstract: An acceleration sensor comprises a fixed case member and a cover assembly collectively defining a closed space in which the oscillation plate and the piezoelectric element received therein. The oscillation plate and the piezoelectric element are oscillatably supported by a supporting portion formed on the central bottom portion of the fixed case member. The oscillation plate and the piezoelectric element are integrally oscillatable in two different modes consisting of: a 1/1 oscillation mode where the oscillation plate is irregularly deformed to have the peripheral portion oscillated with a single vector in the oscillation direction of the oscillation plate when the oscillation plate is oscillated with respect to the fixed case member at a resonance frequency f0; and a 1/2 oscillation mode where the oscillation plate is irregularly deformed to have two different half parts of the peripheral portion oscillated with their respective different vectors opposite to each other in the oscillation direction of the oscillation plate when the oscillation plate is oscillated with respect to the fixed case member at a noise frequency f01, and the resonance frequency f0 and the noise frequency f01 are out of the range of effective oscillation frequencies. Thus constructed acceleration sensor is of high performance and appropriate for automatic production at a low cost.

Abstract translation: 加速度传感器包括固定壳体构件和盖组件，其总体上限定了容纳在其中的振动板和压电元件的封闭空间。 振动板和压电元件由形成在固定壳体的中心底部上的支撑部分摆动地支撑。 振荡板和压电元件可以以两种不同的模式整体振荡，该模式包括：1/1振荡模式，其中当振荡板在振荡板的振荡方向上时，振荡板不规则地变形以使振荡板的周边部分以单个向量振荡 振荡板以谐振频率f 0 0相对于固定壳体构件振荡; 振荡板相对于振荡板的摆动方向相反地振动的周边部分的两个不同的半部分在振荡板的摆动方向相互振荡时振荡板不规则地变形为1/2振荡模式， 以噪声频率f 0 0 1向固定壳体构件发送，并且谐振频率f 0 0和噪声频率f 0 0 1已经超出 有效振荡频率的范围。 这样构造的加速度传感器具有高性能，适合低成本自动生产。