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:
Sep. 01, 1998
Filed:
Jun. 02, 1997
Michael Mallary, Berlin, MA (US);
Quantum Corporation, Milpitas, CA (US);
Abstract
In a magnetic write head, the top pole piece reduces in width and cross-sectional area in a number of steps by providing a first wide tapered zone whose width progressively decreases at a first rate that is determined by side surfaces that are inclined at an angle of about 45 to 55-degrees, and providing a second narrow tapered zone whose width progressively decreases at a second lower rate that is determined by side surfaces that are inclined at an angle of about 5-degrees. This second narrow tapered zone may comprise the serial arrangement of three individual zones, a first of which whose width decreases at a rate that is determined by side that are inclined at about 4.7-degrees, a second of which whose width decreases at a rate that is determined by side that are inclined at about 5.7-degrees, and third of which whose width decreases at a rate that is determined by sides that are inclined at about 6.8-degrees. The pole piece's tapered zone terminates in a narrow and constant width pole tip. As a result, a long magnetic flux saturation zone is provided, wherein length is measured in a direction that extends toward the head's pole tip or write gap. A gap field versus write current (Bg-vs-Iw) curve is thereby provided having a high magnitude Bg and nearly flat slope Bg saturation region. The head is driven with an excess magnitude Iw, thus causing the head's Bg to increase rapidly to its optimum high magnitude, whereupon the increase in Bg abruptly stops. Better overwrite (OVW) is provided, less non linear transition shift (NLTS) occurs, and narrower read-back pulses are provided, at both the inner diameter (ID) and outer diameter (OD) of an associated magnetic recording disk.