| 摘要 |
PURPOSE:To increase the bonding strength of a core and to improve magnetic efficiency, by forming a wide width groove in a track groove so as not to extend to a back gap part, and penetrating melting glass to a core abutting flat part including the gap part by a thin groove. CONSTITUTION:Winding grooves 3 and 4 and a notch groove 5 are formed on core blocks 1 and 2, and the wide width grooves 20 and 21 having depth to the upper edge and the lower edge of the notch groove 5 are formed. And thin grooves 22 and 23 are formed along the center line of the wide width grooves 20 and 21, and glass 24 with low m.p. is molded in the grooves 20 and 21. Furthermore, a gap spacer film 25 is attached on the upper end 24 of the abutting part of the block 1, and abutting is performed by adjusting the track grooves 26 and 27 of the blocks 1 and 2 so as to be confronted with each other. At this time, the melting glass is penetrated in the gap part, then, glass welding is completed, and the core is sliced, which generates a head. In this way, the bonding strength is increased, and the lowering of the magnetic efficiency can be prevented.
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