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:
Jun. 05, 2001
Filed:
Feb. 03, 2000
Applicant:
Inventors:
Hiroshi Inenaga, Ibaraki, JP;
Junshin Sakamoto, Ibaraki, JP;
Assignee:
Hitachi Koki Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G02B 2/608 ;
U.S. Cl.
CPC ...
G02B 2/608 ;
Abstract
An annular groove is formed on the upper surface, or a surface C, of a rotor member. A surface D and a surface E of a rotor member, which are located closer to the center than the annular groove when radially viewed, are machined for correcting a dynamic unbalance of the rotor member. Therefore, a nonuniform deformation of the rotor member, which results from a centrifugal load and heat, which are due to the rotation of the rotor member, reaches the inside-diameter defining wall of the annular groove, but does not reach the outside-diameter defining wall of the annular groove since it is blocked by the annular groove.