Simplified, shielded twin-track read/write head structure
AssigneeInternational Business Machines Corporation
InventorAlbert W. Vinal
Life of this patent
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Abstract
This invention is an improvement in the design of a twin-track read/write heads. The present design eliminates the reluctance gap between the U-shaped write drive coil structure and the U-shaped magnetic sensor and coupling leg structure in that patent. A new structure incorporating two separate coupling legs with a gap at the pole tip interface to the magnetic recording medium for reading and writing is utilized. The new design also incorporates a back gap to adjust the overall reluctance and proportional effect of flying height gap variations. In addition, magnetic shields are introduced to further reduce the effects of fringe field interference at the write head to media interface.
Claims6
An improved twin-track magnetic read/write head comprising a magnetically permeable member having two separate legs, each said leg having two ends, and said head also having a connecting portion comprising a magnetic flux sensor for sensing magnetic flux coupled from a recording medium by said legs and flux sensor joining said two legs;
- and
- an electromagnetic coil wrapped about a section of said magnetically permeable member and wherein;
- first ends of each of said two legs are arranged to vertically confront a planar magnetic medium and are configured such that imaginary vertical projections of said first ends of said legs' upon the plane of the magnetic medium produce, upon relative motion between the medium and the legs in a horizontal plane, separate parallel tracks in said medium, each said imaginary vertical projection having a maximum dimension which is aligned along a line which is generally normal to the direction of motion, whereby magnetic flux patterns may be recorded in said medium in two separate tracks by applying electrical current to said electromagnetic coil and magnetic flux patterns in said separate tracks may be read by coupling flux from said medium through the ends of said legs and therefrom through said connecting portion comprising said magnetic sensor.
Dependencies are inferred from the claim text.