US Patent 7411756 Method and apparatus for write head demagnetization

Patent 7411756 was granted and assigned to Agere Systems on August, 2008 by the United States Patent and Trademark Office.

Overview Structured Data Issues Contributors Activity

Is a

Patent

Patent attributes

Current Assignee

Agere Systems

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

74117560

Patent Inventor Names

Carl F. Elliott0

Ross Schwensen Wilson0

Date of Patent

August 12, 2008

Patent Application Number

110520080

Date Filed

February 4, 2005

Patent Primary Examiner

‌

Andrea Wellington

Patent abstract

An apparatus and method for demagnetizing a write head of a disc drive. Under control of a clock oscillator, synthetic demagnetizing pulses are generated and applied to a writer-driver bridge. Also under control of the clock oscillator, a write current produced by the writer-driver bridge incorporates the demagnetizing pulses and ramps down to about zero. The train of demagnetizing pulses and the write current ramp down demagnetizes the head, reducing write head magnetic bias that may influence the proximate read head of the disc drive head.