| 摘要 |
<p>PURPOSE:To prevent a noise due to a leakage magnetic field from an FG part and a motor part by providing the gear and rotor part of a frequency signal generator FG at the opposite side of a tape guiding drum part to an FG yoke part. CONSTITUTION:A rotating head driving motor part is rotated by a rotation magnetic field generated by a driving coil 15, and the frequency signal generating part FG generates a frequency signal corresponding to the rotating speed. The opposed part of an FG gear and an FG rotor 10 is provided at the opposite side of a tape guiding drum 1 to an FG yoke 9. The yoke is made into a shape to be equipped with a bowl-shaped drawn part in a periphery part. Consequently, the yoke 9 can be magnetically covered securely and made into a magnetic shielding member. In such a way, by making the yoke intervene between the FG part and the driving motor part, and the tape guiding drum part, a shielding efficiency to the leakage magnetic field can be increased, and the noise can be prevented.</p> |
