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. 24, 2012
Filed:
Jun. 06, 2007
Wayne P. Schaefer, North St. Paul, MN (US);
Thu D. Depuydt, Woodbury, MN (US);
Bruce H. Edwards, White Bear Lake, MN (US);
Gregory W. Visich, Woodbury, MN (US);
Wayne P. Schaefer, North St. Paul, MN (US);
Thu D. DePuydt, Woodbury, MN (US);
Bruce H. Edwards, White Bear Lake, MN (US);
Gregory W. Visich, Woodbury, MN (US);
Imation Corp., Oakdale, MN (US);
Abstract
The disclosure is directed to a method for creating a remanence magnetization on a magnetic tape medium. The magnetic tape is first substantially demagnetized, e.g., erased, by an erasure unit having multiple magnetic elements of alternating polarity. The erased magnetic tape is then passed by a bias magnet that creates a remanence magnetization on the magnetic tape. The remanence magnetized magnetic tape is then passed through a servo write head that writes servo patterns to the remanence magnetized magnetic tape. The bias magnet may be housed within the erasure unit or within a bias unit, and the distance between the bias magnet and the tape path of the magnetic tape may be adjustable to create the desired remanence magnetization on the magnetic tape. The remanence magnetization created on the magnetic tape may be greater than 20 percent to reduce defects in the servo pattern written to the magnetic tape.