Variable capacitance device and portable phone

Details Variable capacitance device and portable phone Variable capacitance device and portable phone

2011-05-03

2011-05-03

Nguyen, Duc M (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

C455S193300, C455S197200, C455S290000, C455S340000, C310S311000, C310S348000, C361S277000, C361S290000

Reexamination Certificate

active

07937056

ABSTRACT:
A variable capacitance device has a piezoelectric driving part, a movable electrode, a fixed electrode, a dielectric film and a driving control unit. The piezoelectric driving part has a piezoelectric film, an upper electrode disposed on a top surface of the piezoelectric film, a lower electrode disposed on an undersurface of the piezoelectric film and electrode slits which separate the upper electrode and the lower electrode into two, respectively. The movable electrode is provided via the electrode slits at one end of the piezoelectric driving part. The fixed electrode is disposed opposite to the movable electrode via a gap. The dielectric film is disposed opposite to the movable electrode via the gap and provided on the fixed electrode. The driving control unit adjusts a distance between the movable electrode and the fixed electrode to reduce a fluctuation of a predetermined capacitance of a variable capacitor formed between the variable electrode and the fixed electrode.

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Japanese Office Action dated Sep. 30, 2008 corresponding to U.S. Appl. No. 11/755,107, filed on May 30, 2007.

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