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:
Nov. 21, 2006
Filed:
May. 10, 2005
Houng Joong Kim, Hitachi, JP;
Kohji Maki, Hitachi, JP;
Yasuo Morooka, Hitachi, JP;
Isamu Numata, Juo, JP;
Hisao Tadokoro, Hitachi, JP;
Takeo Morimoto, Koshigaya, JP;
Yasunori Sannohe, Hitachi, JP;
Hiroshi Ueno, Takahagi, JP;
Hideki Shimane, Mito, JP;
Houng Joong Kim, Hitachi, JP;
Kohji Maki, Hitachi, JP;
Yasuo Morooka, Hitachi, JP;
Isamu Numata, Juo, JP;
Hisao Tadokoro, Hitachi, JP;
Takeo Morimoto, Koshigaya, JP;
Yasunori Sannohe, Hitachi, JP;
Hiroshi Ueno, Takahagi, JP;
Hideki Shimane, Mito, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In order to reduce load supported by a support mechanism for supporting a movable part so as to prevent the movable part from moving in a horizontal direction when stress is generated thereon in the horizontal direction, there is provided a drive unit including a primary side having a magnetic body around which a coil is wound, and a secondary side having a plurality of permanent magnets, the primary side including magnetic poles and step portions provided on the magnetic poles. The width of each step portion is smaller than the width of each permanent magnet.