Planar coil magnetic transducer

Claim 1

A magnetic transducer comprising: a generally planar high resistivity substrate having a first major planar surface and an opposing second major planar surface; a generally planar first coil having one side secured to said first major planar surface of said substrate; a magnet positioned adjacent said second surface on the opposite side of said substrate from said generally planar first coil; said planar first coil including an inwardly winding conductive path from an outside connection terminal to an inside connection terminal; said first coil being copper formed on chromium; said substrate being formed of a ceramic material; said conductive path being formed of a plurality of connected conductive runs, each conductive run having a generally rectangular boundary and successively nested within one another, each conductive run having a width of about 5 microns, a spacing of about 5 microns, from an adjacent coil conductive run, and a height in the range of about 1 to 3 microns; a non-conducting passivating layer formed on said planar first coil; a generally planar second conductive coil having one side secured to said passivating layer on the side opposite from said first coil; a conductive interconnection extending through said passivating layer between said first and second coils; and said second conductive coil being formed of a plurality of connected conductive runs, each conductive run having a generally rectangular boundary and successively nested within one another.