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. 02, 2004
Filed:
Sep. 19, 2001
Applicant:
Inventors:
Takayoshi Ozaki, Iwata, JP;
Yuuji Yada, Iwata, JP;
Hironori Tokunaga, Iwata, JP;
Koji Yamada, Iwata, JP;
Assignee:
NTN Corporation, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01S 3/22 ; H01S 3/223 ;
U.S. Cl.
CPC ...
H01S 3/22 ; H01S 3/223 ;
Abstract
First and second radial magnetic bearings are provided at opposing ends of a rotary shaft, first and second protective bearings are arranged in the vicinity thereof, a third radial magnetic bearing is arranged on a side of a fan near a motor, and by the third radial magnetic bearing, negative spring element of the motor is corrected.