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. 19, 1993
Filed:
Aug. 05, 1991
Shigeki Koizumi, Yokoze, JP;
Canon Denshi Kabushiki Kaisha, Chichibu, JP;
Abstract
A disc driving motor for rotating a recording medium in the form of a disc of the type having a disc-shaped rotor yoke around the outer peripheral portion of which is securely joined a driving magnet for generating a rotating force, an auxiliary yoke attached around the outer periphery of the rotor yoke so as to avoid magnetic saturation of the rotor yoke and leakage of the magnetic fluxes from the driving magnet through the outer peripheral portion of the rotor yoke to the exterior. The tops of screws for securely maintaining the core yoke at a predetermined position are not extended beyond the surface of the core yoke in opposing relationship with the rotor yoke.