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. 16, 2001
Filed:
Jun. 20, 2000
Satoshi Nakatsuka, Hiroshima-ken, JP;
Osamu Sasaki, Hiroshima-ken, JP;
Masaharu Abe, Hiroshima-ken, JP;
Toda Kogyo Corporation, Hiroshima, JP;
Abstract
An anisotropic permanent magnet with an improved surface magnetic field peak value is provided, which has at least one active surface and is oriented and magnetized simultaneously in such a manner that axes of easy magnetization of magnetic powder constituting the permanent magnet pass from the active surface through an interior of the magnet to return to the active surface, wherein a standard magnetic pole and a background opposite magnetic pole are present as an island and a sea, and the ratio of an area of the standard magnetic pole to an area of the background opposite magnetic pole is 9 to 90:91 to 10. Also, a permanent magnet for attraction with an improved attraction force is provided, wherein a total area &Sgr;S of an S pole surface and a total area &Sgr;N of an N pole surface satisfy a relationship: 0.5×&Sgr;S≦&Sgr;N≦2.0×&Sgr;S or 0. 5×&Sgr;N≦&Sgr;S≦2.0×&Sgr;N.