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:
Feb. 24, 2015
Filed:
May. 15, 2014
Hgst Netherlands B.v., Amsterdam, NL;
Kouichi Watanabe, Ashigarakamigun, JP;
Hideaki Tanaka, Odawara, JP;
Yoshinori Takeuchi, Ishioka, JP;
HGST Netherlands B.V., Amsterdam, NL;
Abstract
The present disclosure generally relates to clearance control between a magnetic head and a recording medium in a magnetic disk device. A magnetic head comprises an embedded contact sensor, a thermal flying height control element, and a hard disk drive controller. The hard disk drive controller is adapted to control a detection current of the embedded contact sensor and a power applied to the thermal flying height control. The detection current supplied to the embedded contact sensor is optimized so that a change in resistance of the embedded contact sensor is less sensitive relative to the power applied to the thermal flying height control. The resistance of the embedded contact sensor remains unchanged when the power applied to the thermal flying height control is changed to adjust for changes in the clearance. Thus, clearance changes can be detected by monitoring changes in the resistance of the embedded contact sensor.