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. 13, 2003
Filed:
Jan. 31, 2001
Applicant:
Inventors:
Terang KongBeng Thia, Singapore, SG;
Joseph HengTung Lau, Singapore, SG;
Stephen KowChiew Kuan, Singapore, SG;
Jeffrey SoonBeng Sim, Singapore, SG;
Assignee:
Seagate Technology LLC, Scotts Valley, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 2/102 ; G11B 1/518 ; G01R 3/312 ; G01N 3/56 ;
U.S. Cl.
CPC ...
G11B 2/102 ; G11B 1/518 ; G01R 3/312 ; G01N 3/56 ;
Abstract
A preferred system for measuring bearing friction first measures voice coil motor current values required to move an actuator arm assembly to each of several cylinder position intervals. Torque values required to move the actuator arm assembly are then computed using the measured voice coil motor currents. Drive-level bearing friction values are then calculated using the computed torque values and then combined into a composite indicator.