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:
Oct. 29, 2013
Filed:
Jun. 06, 2012
Hans J. Richter, Palo Alto, CA (US);
Erhard Schreck, San Jose, CA (US);
Matteo Staffaroni, Pleasanton, CA (US);
Barry C. Stipe, San Jose, CA (US);
Hans J. Richter, Palo Alto, CA (US);
Erhard Schreck, San Jose, CA (US);
Matteo Staffaroni, Pleasanton, CA (US);
Barry C. Stipe, San Jose, CA (US);
HGST Netherlands B.V., Amsterdam, NL;
Abstract
Instead of using discontinuous step functions or pulses to drive a laser of a TAR enabled disk drive between on and off, a fixed modulation frequency may be used that alternates between a high and low laser power such that the radiation source is always delivering heat to the magnetic media when writing data to the magnetic disk. The magnetic field of the write pole may be synchronized to the modulation frequency of the radiation source to ensure that the radiation source heats the magnetic media proximate to the write pole above the grain freezing temperature when the Zeeman energy produced by the magnetic field of the write pole exceeds the thermal energy of the magnetic media.