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:
Nov. 23, 2004
Filed:
Aug. 23, 2002
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A high speed rotating apparatus including a shaft, a rotary body, and a motor. The rotary body driven by the motor has a hollow into which the shaft is inserted and forms a dynamic pressure air bearing between the rotary body and the shaft. The rotary body includes first and second rotary members. The first rotary member has an inner circumferential surface held for rotation by the dynamic pressure air bearing. The second rotary member has an inner circumferential surface fixed to the outer circumferential surface of the first rotary member through a hardening insertion process. The hardening insertion process is performed such that a tensile strength of the first rotary member is greater than an axial tensile stress to be produced in the inner circumferential surface of the first rotary member.