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. 01, 2008
Filed:
Mar. 27, 2002
Tomohiro Kunita, Hikone, JP;
Yoshihiro Kitamura, Hikone, JP;
Hidekazu Yabuuchi, Hikone, JP;
Hiroki Inoue, Hikone, JP;
Masayuki Suzuki, Hikone, JP;
Tomohiro Izumi, Hikone, JP;
Tomio Yamada, Shiga, JP;
Katsuhiro Hirata, Sanda, JP;
Yasushi Arikawa, Neyagawa, JP;
Yoshitaka Ichii, Kyoto, JP;
Tomohiro Kunita, Hikone, JP;
Yoshihiro Kitamura, Hikone, JP;
Hidekazu Yabuuchi, Hikone, JP;
Hiroki Inoue, Hikone, JP;
Masayuki Suzuki, Hikone, JP;
Tomohiro Izumi, Hikone, JP;
Tomio Yamada, Shiga, JP;
Katsuhiro Hirata, Sanda, JP;
Yasushi Arikawa, Neyagawa, JP;
Yoshitaka Ichii, Kyoto, JP;
Matsushita Electric Works, Ltd., Osaka, JP;
Abstract
A linear oscillator and an electric toothbrush capable of emitting a low noise and of being assembled compact are provided. The linear oscillator, which reciprocates a shaft in an axial direction thereof, includes a plunger movable together with the shaft in the axial direction of the shaft, an elastic member for applying an axially acting resilient force to the plunger, an electromagnetic driving unit operable to reciprocate the plunger in the axial direction of the shaft at a resonant frequency when an alternating current is supplied thereto, and a fixing member restricting rotation of the plunger about an axis thereof within a predetermined angle. The electric toothbrush includes the linear oscillator and a brush head attached to the shaft for use in brushing teeth.