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:
Jul. 29, 2014
Filed:
Feb. 08, 2011
Xuan Zheng, Savage, MN (US);
Timothy William Stoebe, Minnetonka, MN (US);
Jorge Hanchi, St. Louis Park, MN (US);
Kaizhong Gao, Eden Prairie, MN (US);
Xuan Zheng, Savage, MN (US);
Timothy William Stoebe, Minnetonka, MN (US);
Jorge Hanchi, St. Louis Park, MN (US);
Kaizhong Gao, Eden Prairie, MN (US);
Seagate Technology LLC, Cupertino, CA (US);
Abstract
Changes in the thermal boundary condition near a close point of an ABS to a media indicate proximity of the ABS with the media. Before contact, heat conduction from the ABS is primarily through convective and/or ballistic heat transfer to air between the ABS and the media. After contact, heat flux primarily flows from the ABS to the media through solid-solid conductive contact. Further, a light source within a HAMR transducer head may create additional thermal variations within the transducer head. These thermal variations create temperature variations within the transducer head. Two resistance temperature sensors on the transducer head at varying distances from the close point and/or light source measure these temperature variations. A temperature difference between the two resistance temperature sensors indicates proximity of the close point to the media and/or light output.