| 摘要 |
PURPOSE:To prevent mixing of noise by providing an insulator coating a part of a coil and a conductor film coating the insulator so as to allow a noise current charging the static capacitance between the coil and a recording medium to be absorbed into the conductor film. CONSTITUTION:An insulator 22 coating part of a coil 3 and a conductor film 23 coating the insulator 22 are provided. If a potential difference due to a noise 20 is caused between a recording medium 11 and the coil 3, the noise current to charge a static capacitance 21 existing between them flows. Since the static capacitance between the coil 3 and the conductor film 23 is decreased by the insulator 22, the noise current is absorbed by the conductor film 23 and grounded through a ground wire 24. Thus, the noise current does not flow to the coil 3 and the invasion of the noise 20 to the signal reproduced by the amplifier 8 is avoided. |
