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:
Oct. 10, 2006
Filed:
Jun. 13, 2003
Hiroyuki Kobayashi, Yamagata-ken, JP;
Hiroyuki Dohi, Yamagata-ken, JP;
Shouichiro Terauchi, Saitama-ken, JP;
Takashi Ohyaba, Saitama-ken, JP;
Hiroyuki Kobayashi, Yamagata-ken, JP;
Hiroyuki Dohi, Yamagata-ken, JP;
Shouichiro Terauchi, Saitama-ken, JP;
Takashi Ohyaba, Saitama-ken, JP;
Pioneer Corporation, Tokyo, JP;
Tohoku Pioneer Corporation, Yamagata-ken, JP;
Abstract
An internal magnetic circuit is formed by a plate forming a pole piece, a vertically magnetized magnet attached to a bottom face of the plate, and a yoke attached to a bottom face of the magnet. A magnetic gap is formed between the plate and the yoke. The yoke includes a bottom part attached to the bottom face of the magnet, a side part standing on the side of the plate, and a folded-back part folding downwards over the side part to face the magnetic gap. Thus, the internal magnetic circuit having a uniform magnetic flux density inside the magnetic gap along the direction of its length is provided.