Piezoelectric actuator system with position detection...

Details Piezoelectric actuator system with position detection... Piezoelectric actuator system with position detection...

2008-07-07

2009-06-23

Budd, Mark (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S323020

Reexamination Certificate

active

07550896

ABSTRACT:
A piezoelectric actuator system with a position detection function includes an immovable base, a piezoelectric material, a drive shaft, and a movable part. The immovable base has a driving circuit for providing a driving voltage. The piezoelectric material is fixed on the immovable base and electrically coupled to the driving circuit. A length of the piezoelectric material is controlled by the driving voltage. The drive shaft is fixed on the piezoelectric material and has at least two conductive parts having impedance materials. The movable part is disposed on the drive shaft, and a spacer made of a conductive material is installed at its bottom. The two conductive parts are electrically coupled to the spacer, so as to form a conduction path. The driving circuit detects an impedance of the conduction path to determine a position of the movable part.

REFERENCES:
patent: 6246151 (2001-06-01), Nakano
patent: 6249093 (2001-06-01), Takahata et al.
patent: 6512321 (2003-01-01), Yoshida et al.
patent: 7480109 (2009-01-01), Hu et al.

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