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:
Feb. 07, 2007
Applicants:
Manuel A. Hernandez, San Jose, CA (US);
Yen Fu, San Jose, CA (US);
Ellis T. Cha, San Ramon, CA (US);
Inventors:
Manuel A. Hernandez, San Jose, CA (US);
Yen Fu, San Jose, CA (US);
Ellis T. Cha, San Ramon, CA (US);
Assignee:
SAE Magnetics (H.K.) Ltd., Shatin, N.T., HK;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01L 3/02 (2006.01); G01L 3/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
In a method and apparatus for testing a head-gimbal assembly (HGA), a HGA is placed in contact with force transducers mounted on a rotational stage. The force transducers are adjusted to position the transducers around a rotational center of the rotational stage. The rotational stage is rotated, and the torque and variations in torque exerted by the HGA on the force transducers during rotation are measured.