Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2006-09-19
2006-09-19
Budd, Mark (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S319000
Reexamination Certificate
active
07109636
ABSTRACT:
A dynamic-quantity sensor includes two piezoelectric vibrators which are arranged such that stresses generated by a dynamic quantity, such as acceleration, are applied in opposite phases to the piezoelectric vibrators. A current-voltage converting and signal adding circuit converts current signals flowing in the piezoelectric vibrators into voltage signals. A feedback signal processing circuit amplifies a combined signal of the two voltage signals and feeds back the combined signal to an acceleration sensing element, so that oscillation is performed. A self-diagnostic circuit including a series circuit including a switching circuit and a capacitor is provided between a reference potential (ground) and a node between one of the piezoelectric vibrators and a resistor in which a current of the one of the piezoelectric vibrators flows. Diagnosis is performed in accordance with whether or not a signal based on turning on and off of the switching circuit changes normally.
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Official Communication issued in the corresponding Japanese Patent Application No. 2003-315945, dated Jun. 6, 2006.
Budd Mark
Keating & Bennett LLP
Murata Manufacturing Co. Ltd.
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