| 摘要 |
PURPOSE:To facilitate extremely the replacement of a main magnetic pole body, and to shield and external magnetic field and to prevent a recording and reproduction level from lowering by attaching the main magnetic pole body detachably in the recessed part of a magnetic material block with high magnetic permeability through a leaf spring. CONSTITUTION:One of end sides of leaf springs 41 and 42 which are sectioned semiarcuately are locked in the recessed part 43a of a shield block made of a magnetic material with high magnetic permeability, the other-end sides are made to abut on the corners of the recessed part 43a to fix the main magnetic pole block 15 tightly by the leaf springs, and an auxiliary magnetic pole block 19 is arranged opposite it. Even when an external magnetic field is applied during magnetic recording, it passes through the blocks 43 and 19 and exits to the air, so that it is separated completely from a recording magnetic field. Thus, the external magnetic field is cut off to evade a fall in recording and reproducing level and also facilitate the replacement of the main magnetic pole block 15 extremely.
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