Dynamic magnetic information storage or retrieval – Head – Core
Reexamination Certificate
2006-01-27
2009-12-01
Blouin, Mark (Department: 2627)
Dynamic magnetic information storage or retrieval
Head
Core
Reexamination Certificate
active
07626785
ABSTRACT:
A main magnetic pole layer is constructed so as to have a stacking structure in which a lower main magnetic pole layer having relative low saturated magnetic flux density and an exposed surface area is positioned on a leading side, and an upper main magnetic pole layer having relative high saturated magnetic flux density and having an exposed surface area is positioned on a trailing side. The exposed surface of a main magnetic pole layer has a planar shape of a bilaterally-symmetrical inverted trapezoidal shape in which a width of an upper edge is larger than a width of a lower edge and is equal to or larger than a width of the exposed surface of the main magnetic pole layer at an arbitrary intermediate position between the lower edge and the upper edge. In particular, a height at a center position in the exposed surface area in the upper main magnetic pole layer is larger than a height in the exposed surface area in an arbitrary peripheral position around the center point.
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Blouin Mark
Oliff & Berridg,e PLC
Sae Magnetics (H.K.) Ltd.
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