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:
Aug. 26, 1986
Filed:
May. 20, 1985
Takao Ishida, Kawasaki, JP;
Yoshitsugu Nakatomi, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
In an optical deflector of a polygonal mirror type, a rotating shaft is supported by a pair of journal bearings of a herringbone dynamic pressure type and a magnetic thrust bearing. The magnetic thrust bearing comprises first and second annular magnets. The first annular magnet is coaxially fixed to the shaft and has a first magnetic pole arrangement on its outer surface. The second annular magnet is fixed to a housing, and has its inner surface opposed to the outer surface of the first magnet and magnetized with a pole arrangement different from the pole arrangement of the first magnet, so that the first and second magnet attract one another to suspend the shaft. Ferromagnetic plates are fixed on both upper and lower surfaces of the first and second magnets.