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:
Feb. 27, 1990
Filed:
Apr. 25, 1989
Kinya Horibe, Skizuoka, JP;
Masazumi Kawai, Skizuoka, JP;
Yasukazu Hoshino, Skizuoka, JP;
Koichiro Tsuji, Skizuoka, JP;
Kiyofumi Uchida, Skizuoka, JP;
Yazaki Corporation, Tokyo, JP;
Abstract
A magnetic plastic rotor disk manufacturing apparatus according to the present invention is capable of manufacturing a plurality of magnetic plastic rotor disks having equal desired surface magnetic flux density distribution characteristics in a single molding cycle. The apparatus comprises a metal mold composed of a pair of half molds and having a plurality of cavities for receiving magnetic plastic material therein, etiher one or a plurality of magnetic field creating coils for creating one or a plurality of magnetic fields to magnetize and orient the magnetic particles in the above magnetic plastic material injected into the cavities, and also a plurality of yokes, one of which by any means extends from the central portion thereof along the splitting surface of the metal mold toward the above cavities formed on a circle concentrically formed therein so as to guide the magnetic fluxes of the magnetic fields created by the above coils to flow radially from the central portion of the same toward the periphery thereof. Thus, the magnetic plastic rotor disks formed in the cavities are exposed uniformly and diametrically to the magnetic flux, enabling them having a satisfactorily large surface magnetic flux density.