Process of fabricating multichannel magnetic head units

Claim 1

A process for fabricating multichannel magnetic transducer head units wherein magnetic heads are stacked one beside the other to correspond to adjacent tracks of a movable magnetizable medium with each head including first and second half-heads between which an air gap is provided, said process comprising the steps of: forming composite sheets with cutout patterns of dIfferent types for forming the elements of M sets of N pairs of half-heads by the combined steps of etching sheets and juxtaposing elements thereon, said composite sheets comprising, a first type composite sheet comprising M X N pairs of elements of a high permeability magnetic metal and M X N pairs of elements of a conductive metal, two second type composite sheets each comprising M X N pairs of elements of a high permeability magnetic metal and M X N pairs of elements of insulating material, two third type sheets each comprising M X N pairs of elements of conductive metal, wherein one element of each pair comprises two separated portions, and two fourth type sheets each comprising M X N pairs of elements of conductive metal; forming a lmaination of magnetic circuits by superposing and bonding of said first type sheet between said two second type sheets; mounting a transducer coil on a branch of each magnetic circuit in said lamination; assembling by superposing and bonding one of said third type sheets on each face of said lamination; soldering to one of said separated portions of each pair of elements of said third type sheets a connection lead of the corresponding coil; assembling by superposing and bonding one of said fourth type sheets on the external surface of each said third type sheets; separating by cutting the assembled sheets into M X N pairs of half-heads as parallelepipeds; and positioning pairs of said half-heads and inserting a gap spacer between each pair of half-heads.