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:
May. 26, 2015
Filed:
Jul. 29, 2013
Tdk Corporation, Minato-ku, Tokyo, JP;
Yoshiaki Haga, Tokyo, JP;
Masaru Uno, Tokyo, JP;
TDK CORPORATION, Tokyo, JP;
Abstract
A driving apparatus comprises a piezoelectric element () expanding and contracting in accordance with a driving pulse signal (), a supporting shaft () connected to said piezoelectric element, a movable body () frictionally engaged with said supporting shaft and capable of moving along said supporting shaft, and a driving portion () applying said driving pulse signal having a voltage value that corresponds to a driving voltage value (VD) to said piezoelectric element in order to cause relative movement of said movable body to said supporting shaft, wherein a driving voltage waveform () showing a time-varying of said driving voltage value has a first dropping portion () where said driving voltage value sharply drops from a first value (V) to a second value (V), a second dropping portion () where said driving voltage value slowly drops from said second value (V) to a third value (V) compared with said first dropping portion, and a third dropping portion () where said driving voltage value sharply drops from said third value (V) to a standard value (V) compared with said second dropping portion.