Magnetic head having an integrated recording and playback head and an erasure head

Claim 1

A magnetic head comprising: a recording reproduction head provided with a first core which has means for accommodating a first coil winding means and metallic magnetic films forming a magnetic circuit in response to the conduction of electric current through the first coil winding means and a recording and reproduction gap and formed on first non-magnetic members; an erasure head provided with second and third cores which have means for accommodating a second coil winding means and metallic magnetic films forming magnetic circuits in response to the conduction of electric current through the second coil winding means and respective, spaced erasure gaps and formed on side surfaces of ridges of second non-magnetic members so that the distance between the both metallic magnetic films on both side surfaces of the ridge of each of said second non-magnetic members becomes wider in proportion to the distance from the erasure gaps, and which are arranged to erase both side portions of a track width of a magnetically-recorded portion recorded on a magnetic recording medium by said recording and reproduction head, by the use of said second and third cores, to leave a predetermined recording track width; and means for connecting said recording and reproduction head and said erasure head in a direction in which said magnetic recording medium runs, wherein said erasure head is constructed such that pairs of metallic magnetic films forming magnetic circuits are formed on both side surfaces of two second non-magnetic members so that the leading edges of ridges of said second non-magnetic members are flat, and such that said pairs of metallic magnetic films are made to abut against each other through a non-magnetic gap material at portions thereof adjacent to the flat surfaces of the leading edges of said magnetic members to form said second and third cores, wherein said metallic magnetic films are exposed on the surface facing said magnetic recording medium, wherein the abutting portions of each of said pairs of metallic magnetic films extend parallel to each other and generally perpendicular to the direction in which said magnetic recording medium runs, and wherein the width of the flat surfaces of said leading edges of said second non-magnetic members sandwiched between said second and third cores is defined by the intersections between said flat surfaces and the surface facing said magnetic recording medium and is equal to or less than said track width.