US Patent 7554243 Class DE driving amplifier for piezoelectric actuators

Patent 7554243 was granted and assigned to Nokia on June, 2009 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Nokia

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7554243

Patent Inventor Names

Mikko Ollila0

Date of Patent

June 30, 2009

Patent Application Number

11174451

Date Filed

July 1, 2005

Patent Primary Examiner

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Quyen Leung

Patent abstract

The invention relates to a method and device for driving a piezo-electric actuator. A driving voltage is coupled to the piezo-electric actuator by an inductive element coupled in series with the piezo-electric actuator. The piezo-electric actuator is adapted to move an object. The frequency of the driving voltage coupled to the piezo-electric actuator is varied and the velocity of the object is recorded as a function of the frequency. Subsequently, an optimum frequency is determined and the frequency of the driving voltage is adjusted to be substantially equal to the optimum frequency. The optimum frequency is preferably associated with a maximum obtainable velocity of the object.