| 摘要 |
PURPOSE:To decrease the generation of a contour effect and to eliminate uneven wear by providing notches to the top end in the projecting part of a substrate, packing a nonmagnetic material having the intermediate wear rate between the wear rates of the substrate material and magnetic films into the notched parts and making the boundary line between the nonmagnetic material and the substrate non-parallel with a gap. CONSTITUTION:Core blocks 30, 30' each provided with a V-shaped projecting part are constituted of ferrite or nonmagnetic ferrite, ceramics, etc. The nonmagnetic metal, glass, ceramics or the like having the wear characteristic different from the wear characteristic of the substrate material is packed into the notched parts 31, 31'. The boundary line between the nonmagnetic material and the substrate material is made non-parallel with the working gap. A soft magnetic material such as 'Permalloy(R)' alloy, 'Sendust(R)' alloy or amorphous alloy which is formed as a thin film is used for the magnetic metallic films 32, 32' constituting the head cores. The core blocks are adhered by the packed glass 33, for which low melting lead glass is used. The working gap 34 is formed by butting the blocks in such a manner that the V-shaped magnetic metallic films having the flat parts corresponding to the track width provide the required gap length with the non magnetic film in-between. |
