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:
Dec. 11, 2007
Filed:
Jun. 13, 2005
Tomohiro Izumi, Osaka, JP;
Yasuo Ibuki, Hikone, JP;
Mikihiro Yamashita, Echi-gun, JP;
Hideaki Abe, Neyagawa, JP;
Tomohiro Izumi, Osaka, JP;
Yasuo Ibuki, Hikone, JP;
Mikihiro Yamashita, Echi-gun, JP;
Hideaki Abe, Neyagawa, JP;
Matsushita Electric Works, Ltd., Osaka, JP;
Abstract
A driving unit of the present invention comprises a moving element, an elastic body configured to support the moving element, a permanent magnet fixed on said moving element, an electromagnet disposed to be opposed to said permanent magnet, and a controller. The moving element and the elastic body constitute a resonance system. The electromagnet includes a magnetic material and a coil wounded around the magnetic material. The controller magnetizes the magnetic material by feeding a current through the coil and gives a vibration force to the moving element by magnetic force acting between the magnetic material and the permanent magnet. The feature of the present invention resides in that the controller determines a current waveform necessary for an intended motion of the moving element, and applies a voltage to the coil intermittently so that a current in the form of the current waveform flows through said coil.