Variable capacitor adjustable by linear motor

Details Variable capacitor adjustable by linear motor Variable capacitor adjustable by linear motor

2006-06-13

2006-06-13

Ha, Nguyen T. (Department: 2831)

Electricity: electrical systems and devices

Electrostatic capacitors

With protection or compensating means

C361S273000, C361S278000, C361S279000, C361S283100, C361S283300, C361S290000

Reexamination Certificate

active

07061745

ABSTRACT:
The disclosure describes a variable capacitor device, which is formed by a linear motor and a variable capacitor having at least one stator electrode and a movable electrode. A piezoelectric transducer of the linear motor is frictionally coupled to the movable electrode. Application of electrical signals to the piezoelectric transducer of the linear motor produces a motion of the surface of the piezoelectric transducer. The frictional coupling between the piezoelectric transducer surface and the movable electrode transmits a fraction of piezoelectric transducer motion to the movable piston electrode thereby changing the capacity of the variable capacitor. The amount and sign of the capacitance change is selectable by the operator through control of the electrical signals applied to the piezoelectric transducer.

REFERENCES:
patent: 3213340 (1965-10-01), Robertson
patent: 3447047 (1969-05-01), Lindsay
patent: 4035697 (1977-07-01), Arnold, Jr.
patent: 4837516 (1989-06-01), Takahashi
patent: 4902975 (1990-02-01), Kess
patent: 5590015 (1996-12-01), Planta et al.
patent: 5657006 (1997-08-01), Kinoshita et al.
patent: 5818683 (1998-10-01), Fujii

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