| 摘要 |
PURPOSE:To prevent magnetic saturation of a core facing a recording and reproducing magnetic circuit by forming this core out of cores of an erasing magnetic circuit with materials which have a saturation magnetic flux density higher than that of the other cores. CONSTITUTION:An erasing magnetic circuit 16 consists of an I-shaped core block 17 and a plane plate-shaped core block 18 consisting of materials having a high saturation magnetic flux density (like a 'Sendust(R)'). These blocks 17 and 18 are provided with grooves 17a and 18a constituting a track width, and erasing gaps 10 between faces facing each other of blocks are joined by a glass 19. Similarly, a recording and reproducing magnetic circuit 20 consists of core blocks 21 and 22 which are allowed to face each other through a gap 3 and are joined and is aligned and is joined to the circuit 16. By this constitution, magnetic saturation of the core 18 is prevented and the interval between magnetic gaps of circuits 16 and 20 is narrowed.
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