| 摘要 |
PURPOSE:To reduce a head resistance which is the main cause of a thermal noise and to reduce a head noise even when a head is made into multicoil by making the core width smaller. CONSTITUTION:The core width of a head coil window part in at least one head core part is set to a value range more than 0.05mm and less than 0.7mm, and the number of coils are more than 25. Thus the thermal noise due to the practical resistance of the head can be reduced, whereby a noise level can lie within the range of a conventional head even if the number of head coils is set to more than 25.
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