发明授权
- 专利标题: Vibration gyroscope
- 专利标题(中): 振动陀螺仪
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申请号: US840030申请日: 1997-04-24
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公开(公告)号: US5902931A公开(公告)日: 1999-05-11
- 发明人: Akira Mori , Akira Kumada
- 申请人: Akira Mori , Akira Kumada
- 申请人地址: JPX
- 专利权人: Murata Manufacturing Co., Ltd.
- 当前专利权人: Murata Manufacturing Co., Ltd.
- 当前专利权人地址: JPX
- 优先权: JPX8-131069 19960426; JPX8-131070 19960426; JPX8-131071 19960426
- 主分类号: G01C19/5649
- IPC分类号: G01C19/5649 ; G01P9/04
摘要:
A vibration gyroscope which is capable of accurately detecting a rotational angular velocity regardless of environmental changes or changes in vibrator characteristics includes a vibrator formed of a vibration element, and first and second piezoelectric elements for detection and a third piezoelectric element for driving. Output currents of the first and second piezoelectric elements are converted into voltages by I-V conversion circuits, or output voltages of the first and second piezoelectric elements are detected by voltage detection circuits, and then the voltages are added together by an adder circuit. An output signal of the adder circuit is monitored by a monitor circuit. On the basis of this result, the voltage or the phase of a drive signal fed from an oscillation circuit to the third piezoelectric element is controlled. The output signals of the I-V conversion circuits or the output signals of the voltage detection circuits are formed into a DC signal corresponding to a rotational angular velocity via a differential amplifier circuit, a synchronization detection circuit, a smoothing circuit, and an amplifier circuit.
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