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. 10, 1999
Filed:
Apr. 01, 1998
Yoshikazu Nishida, Tokyo, JP;
Toshiharu Miyago, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
Between a manget (11) on the side of an upper drum (2) and a magnet or electromagnet (12) on the side of a lower drum (3), a force of attraction is exerted. With this force of attraction, pre-load of about 2 Kg is applied to a ball bearing (5) in a direction of an axis, to increase stability of rotation of the upper drum (2). Since the upper drum (2) is borne by the axis (4) with one bearing (5), a center of rotation of the upper drum (2) relative to the axis (4) can be changed by changing a balance among forces of attraction of three magnets or electromagnets (12). With this constitution, a precision rotator which allows correction of the center of rotation can be provided.