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:
Jan. 06, 2009
Filed:
May. 14, 2004
Hiroaki Shimizu, Hikone, JP;
Ryo Motohashi, Hikone, JP;
Hidekazu Yabuuchi, Hikone, JP;
Takahiro Nishinaka, Omihachiman, JP;
Hiroaki Shimizu, Hikone, JP;
Ryo Motohashi, Hikone, JP;
Hidekazu Yabuuchi, Hikone, JP;
Takahiro Nishinaka, Omihachiman, JP;
Panasonic Electric Works Co., Ltd., Osaka, JP;
Abstract
In a reciprocal linear driving actuator used as a drive source of a power toothbrush, two permanent magnets are formed substantially disc shape or substantially tubular shape, and fitted to and fixed on a shaft directly or via a spacer with a predetermined distance in axial direction of the shaft, so that a moving object is constituted by the shaft and the permanent magnets. On the other hand, a tubular shaped stator, which is constituted by a coil wound around a bobbin and stationary yokes and so on, is provided to face side faces of the permanent magnets of the moving object via a predetermined clearance so that a center axis thereof becomes coaxial with the center axis of the shaft. By supplying alternating current to the coil, the moving object is driven reciprocally and linearly in the axial direction of the shaft.