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:
Jan. 31, 1995
Filed:
Dec. 21, 1992
Kanegafuchi Kagaka Kogyo Kabushiki Kaisha, Osaka, JP;
Abstract
A method of producing a magnet roll in which a magnetic property comparable to that obtained by an injection molding can be obtained in spite of an extrusion molding. According to a first embodiment, the yoke width of the magnetic-field extrusion die is varied along an extrusion direction. According to a second embodiment, a pipe filled with resin bonded magnet material is used as a shaft. According to a third embodiment, a shaft having a groove which is filled with magnet is used. According to a fourth embodiment, a shaft provided with surface magnetic charge is used. According to a fifth embodiment, a magnetized region of a shaft is set to be shorter than the length of a main magnet. According to a sixth embodiment, an extruded matter is moved while stored in a sizing metal mold having a magnetic circuit structure. According to a seventh embodiment, a sizing metal mold for storing an extruded matter therein is installed into a heating device and a cooling device equipped with a magnetic circuit structure while storing an extruded matter therein. According to an eighth embodiment, a preliminary magnetization is carried out with magnetic poles whose number is smaller than a finally-required number of magnetic poles, and then a re-magnetization is carried out with the finally-required number of magnetic poles.