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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.:

US 9984719 B1

PDFFull Text
Date of Patent:
May. 29, 2018

Filed:

Dec. 02, 2015

Laser mode hopping detection for heat-assisted magnetic recording device

Applicant:

Seagate Technology Llc, Cupertino, CA (US);

Inventors:

Robert Matousek, Berthoud, CO (US);

Todd Lammers, Lafayette, CO (US);

Jon David Trantham, Chanhassen, MN (US);

Assignee:

Seagate Technology LLC, Cupertino, CA (US);

Attorney:

Taylor English Duma LLP

Primary Examiner:

Tan X Dinh

Int. Cl.
CPC ...
G11B 11/00 (2006.01); G11B 11/105 (2006.01); G11B 7/126 (2012.01); G11B 5/40 (2006.01); G11B 5/455 (2006.01); G11B 19/04 (2006.01); G11B 7/13 (2012.01); G11B 5/31 (2006.01); G11B 7/1267 (2012.01); G11B 7/1263 (2012.01); G11B 5/00 (2006.01);
U.S. Cl.
CPC ...
G11B 11/10534 (2013.01); G11B 5/40 (2013.01); G11B 5/455 (2013.01); G11B 7/126 (2013.01); G11B 19/046 (2013.01); G11B 5/314 (2013.01); G11B 7/1263 (2013.01); G11B 7/1267 (2013.01); G11B 7/13 (2013.01); G11B 11/10595 (2013.01); G11B 2005/0021 (2013.01);
Abstract

Methods and apparatuses for detecting mode hopping in a laser diode or other optical energy source in heat-assisted magnetic recording. An output power of the laser diode or other optical energy source is measured and the output power is differentiated over time to determine a rate of change. If it is determined that the rate of change exceeds a threshold value, a fault signal is asserted indicating a potential mode hopping event.

Find Patent Forward Citations

Matousek, Robert. (2018). Laser mode hopping detection for heat-assisted magnetic recording device (U.S. Patent No. 9984719). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/9984719

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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