The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 15, 2010
Filed:
May. 20, 2009
Yusuke Adachi, Osaka, JP;
Hideaki Mukae, Hyogo, JP;
Masaru Higashionji, Osaka, JP;
Eiichi Nagaoka, Hyogo, JP;
Kenichi Honjo, Osaka, JP;
Yusuke Adachi, Osaka, JP;
Hideaki Mukae, Hyogo, JP;
Masaru Higashionji, Osaka, JP;
Eiichi Nagaoka, Hyogo, JP;
Kenichi Honjo, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
An ultrasonic actuator includes: an actuator body () including an actuator body (); a control circuit () for setting a driving frequency; power supply sources () for applying a driving voltage having the driving frequency to the actuator body; and a memory () for storing data related to a difference between antiresonance and resonance frequencies of the actuator body (). The control circuit () determines, based on a reference frequency where a current value of a current fed to the piezoelectric element () is local minimum and the data stored in the memory (), a lower limit of a control range of the driving frequency so that the lower limit is equal to or higher than a frequency where the current value of the current fed to the piezoelectric element () is local maximum and determines the driving frequency to be a frequency in the control range.