| 摘要 |
PURPOSE:To improve a life of a magnetic head itself by insulating electrically a magnetic core itself and a coil by an insulation glass layer of the low melting point even when the coat of the coil is damaged at the groove-formed surface angle part. CONSTITUTION:In the butted surface of a pair of core blocks 21a and 21b, plural notch grooves 5 for regulating a track width are formed along the lengthwise direction angle part of the core block at the prescribed interval and a groove 8 for winding and a groove 6 for reinforcement are formed at one side core block 21a. After a low melting point glass rod 7 is placed at the notch groove 5, the groove 8 for winding and the groove for reinforcement, thermal treatment is executed for the glass rod 7, and the rod 7 is filled in the notch groove 5, the groove 8 for winding and the groove 6 for reinforcement. Next, the glass 7 protruded from the notch groove 5, the groove 8 for winding and the groove 6 for reinforcement is removed, and further, a mirror surface-shaped glass layer 7a is formed on the forming wall surface of the groove for winding. To the protruded surface of both blocks 21a and 21b, a high melting point glass layer 4 is covered, and thereafter, both blocks 21a and 21b are protruded, the melting temperature of low melting point glass is executed, the welding is executed and the coupling body is formed. |
