Integrated magnetic transducer

摘要

A magnetic transducer for reading and/or writing data contained on a carrier comprises two thin magnetic layers constituting the first and second pole pieces of the transducer. The layers are superimposed and magnetically coupled at one end and arranged at the other end adjacent the carrier, substantially perpendicular to the latter to form an air-gap to establish a magnetic circuit for the transducer. A coil is disposed between the thin magnetic layers. The coil is of thin conductive layers superimposed in a direction perpendicular to the plane of the magnetic layers and separated from each other by thin electrically insulating layers. The coil comprises windings of a number of turns N1 and N2 adapted to be traversed respectively by currents I1 and I2, the coefficients of mutual magnetic coupling of each of the thin conductive layers of each of the two windings with the downstream pole piece being respectively designated by Li1 and Lj2 being such that: <IMAGE> whereby equal magnetic fluxes are created in the downstream pole piece, the downstream pole piece being defined as that pole piece which is last to be passed by a carrier moving substantially perpendicular to the plane of the layers and the air gap and successively past the first and second pole pieces.