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:
May. 24, 1994
Filed:
Aug. 05, 1992
Applicant:
Inventors:
Fumio Yoshida, Toride, JP;
Mikio Nakasugi, Chofu, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02K / ; F16C / ;
U.S. Cl.
CPC ...
310 90 ; 384107 ;
Abstract
A resist 4 is printed on the areas where the dynamic pressure generating grooves 2 are to be formed, on curved surface of a shaft core member 1a. After the resist 4 is hardened by baking, hard electroless plating is conducted to form a plated layer 3 of a thickness equal to the depth of the grooves 2. Then the resist 4 is removed to obtain a shaft 1 with dynamic pressure generating grooves 2. The dynamic pressure during rotation is free from fluctuation as the dynamic pressure generating grooves are highly precise and constant in the depth and in the cross-sectional shape.