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:
Sep. 09, 2003
Filed:
Feb. 07, 2002
Maruwa Electronic Inc., Chiba, JP;
Abstract
A high-speed rotation testing apparatus includes a spindle holding a test object S at its lower end, a driving motor for applying torque to the spindle and a frame for supporting a rotor shaft of the driving motor so that the shaft is arranged toward the vertical direction of the apparatus, wherein the spindle is driven directly by a driving motor by inserting the spindle into a through-hole that penetrates the center of the rotor shaft and coupling the upper ends of the rotor shaft and the spindle together, and the through-hole has an inner diameter set so as to form a clearance in which the lower end of the spindle can swing, and further, a damping mechanism that restrains swing is arranged in the vicinity of the lower end of the spindle which projects from the lower end of the rotor shaft