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:
Oct. 10, 2006
Filed:
Jul. 11, 2005
Reiko Nagahama, Shiojiri, JP;
Reiko Nagahama, Shiojiri, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
Detection electrodesD andE are formed at positions that include an antinode of a flexural oscillation mode. The strain of flexural oscillation reaches a maximum and the effects on the phase difference in the longitudinal oscillation mode can be cancelled out. The detection electrodesD andE are formed at the positions of drive electrodesB andC used to excite the flexural oscillation mode. A phase difference in the flexural oscillation mode opposite in sign relative to the longitudinal oscillation mode is created making it is easy to classify based on the phase difference between a frequency at which the longitudinal oscillation mode is dominant and a frequency at which the flexural oscillation mode is dominant. Thus, reliable control can be achieved based on the oscillation behaviors at each frequency ensuring a satisfactory drive force based on oscillation in the longitudinal oscillation mode.