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:
Jul. 14, 2015
Filed:
Jul. 22, 2009
Hitoshi Kawamura, Ibaraki, JP;
Manabu Tani, Ibaraki, JP;
Takashi Hasuda, Ibaraki, JP;
Ikuo Shinta, Ibaraki, JP;
Susumu Aoki, Ibaraki, JP;
Keisuke Taguchi, Ibaraki, JP;
Hitoshi Kawamura, Ibaraki, JP;
Manabu Tani, Ibaraki, JP;
Takashi Hasuda, Ibaraki, JP;
Ikuo Shinta, Ibaraki, JP;
Susumu Aoki, Ibaraki, JP;
Keisuke Taguchi, Ibaraki, JP;
Hitachi Maxell, LTD., Osaka, JP;
Abstract
A drive device in which the frequency of a drive waveform applied to a piezoelectric element is easily settable with less obligation to consider resonance in a stationary member. The device includes a piezo element that expands and contracts according to a drive voltage, a transmission shaft that receives vibration produced by the piezo element, a stationary member that holds the transmission shaft in a slidable state along the longitudinal direction of the transmission shaft, and a lens holder that is displaced together with the piezo element and transmission shaft relative to the stationary member according to drive of the piezo element. The piezo element and the transmission shaft move in the moving direction of the lens holder in synchronization with the lens holder according to drive of the piezo element in the state where the piezo element is spaced from the stationary member. By employing this structure, the frequency of the drive waveform applied to the piezo element can be set easily without considering resonance in the stationary member.