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:
Aug. 01, 2006
Filed:
Dec. 05, 2003
Li-yan Zhu, San Jose, CA (US);
Chao-hui Yang, Milpitas, CA (US);
Xiaofeng Zhang, Fremont, CA (US);
Yen Fu, San Jose, CA (US);
Ellis T. Cha, San Ramon, CA (US);
Li-Yan Zhu, San Jose, CA (US);
Chao-Hui Yang, Milpitas, CA (US);
Xiaofeng Zhang, Fremont, CA (US);
Yen Fu, San Jose, CA (US);
Ellis T. Cha, San Ramon, CA (US);
SAE Magnetics (H.K.) Ltd., Shatin, HK;
Abstract
A system and method for testing the stroke and frequency response of a micro-actuator is disclosed. A dynamic parameter tester writes two concentric tracks on a noise free portion of a magnetic storage medium. A magnetic read/write head and a micro-actuator is positioned between the two concentric tracks. An initial oscillating voltage is applied at a first frequency to the micro-actuator while reading back a signal from the two concentric tracks. A stroke characteristic of the micro-actuator is calculated based in part on the read-back signal. The initial oscillating voltage is determined from previous tests. The first stroke characteristic of the micro-actuator is based on a time-averaged amplitude of the first signal. The two concentric tracks are written at a pre-determined pitch.