| 摘要 |
PURPOSE:To maintain a high erasion rate by forming a thin film having a magnetic permeability on the joint surface generated on the opposite surface of a front gap which becomes a magnetic gap of an erasing head, at the time of joining a center core and a side core. CONSTITUTION:A groove 9 which becomes a winding window 5, a slant face 10 for filling the glass 15, and a groove 11 for readjusting an erasion width are worked in a side core block 7 which becomes a side core 3. After polishing a butt surface 12 to a center core 4, a joint part to the center core 4 is covered with a mask 13, and in the remaining part, a metallic compound soft magnetic thin film 14 is formed by vapor-deposition, etc. Subsequently, both right and left side faces of a center core block 8 which becomes the center core 4 are polished and superposed on the side core block 7, and they are joined by making the glass 15 flow into a gap of the same thickness as the thin film 14 between both of them, the grove 11, and the slant face 10. Both the blocks 7, 8 which have been joined in this way are sliced to a necessary thickness after executing the curved surface working of a tape passing surface, and an erasing head block is obtained.
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