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:
Mar. 24, 2009
Filed:
Aug. 25, 2004
Masanori Ueda, Kawasaki, JP;
Haruyuki Matsunaga, Kawasaki, JP;
Masanori Ueda, Kawasaki, JP;
Haruyuki Matsunaga, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A dynamic pressure bearing manufacturing method, comprising the steps of forming a herringbone groove pattern on the outer peripheral surface of a cylindrical mask and a spiral groove pattern on the lower surface of the flange part thereof, inserting the mask in a dynamic pressure bearing and optical fibers into the mask, radiating light from an external light source to the mask through optical fibers to transfer the herringbone groove pattern onto the inner peripheral surface of the dynamic pressure bearing and, at the same time, radiating the light from the upper side of the flange part to transfer the spiral groove pattern onto the upper surface of the dynamic pressure bearing performing development, and forming a herringbone groove on the inner peripheral surface of the bearing by etching and a spiral groove on the upper surface thereof.