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:
Jun. 03, 2008
Filed:
Nov. 26, 2002
Hiroshi Nakagawa, Ise, JP;
Kazumichi Kato, Watarai-gun, JP;
Toshio Miki, Ise, JP;
Minoru Maeda, Taki-gun, JP;
Takashi Fukunaga, Ise, JP;
Kozo Furutani, Ise, JP;
Toshiya Sugimoto, Ise, JP;
Hiroshi Nakagawa, Ise, JP;
Kazumichi Kato, Watarai-gun, JP;
Toshio Miki, Ise, JP;
Minoru Maeda, Taki-gun, JP;
Takashi Fukunaga, Ise, JP;
Kozo Furutani, Ise, JP;
Toshiya Sugimoto, Ise, JP;
Shinko Electric Co., Ltd., Tokyo, JP;
Abstract
An object of the present invention is to provide a linear actuator in which reliability is improved, and performance is also easily improved. The present invention provides a linear actuator including a stator, a movable element having an iron member, and being reciprocatable with respect to the stator, a permanent magnet fixed to the stator so as to be opposed to the iron member, and a coil fixed to the stator. Because both the coil and the permanent magnet are fixed to the stator, electrical current does not have to be supplied to the movable element, and the feeder lines connected to the coil will not be broken due to the movement of the movable element. In addition, the weight of the movable element will not be increased even when the weigh of the permanent magnet is increased in order to obtain high magnetic flux density for improvement in performance. Moreover, because the movable element does not include a magnet, a magnetizing operation does not have to be applied to the movable element. The permanent magnets may be a pair in which the directions the magnetic poles thereof differ from each other, and two pairs of permanent magnets may be provided. The number of magnetic fluxes that run through the magnetic pole elements and the iron member can be increased by providing a magnetic reluctance section around the permanent magnets.