| 摘要 |
<p>PURPOSE:To reduce the influence of disturbance during signal transmission by shielding a rotary transformer part from the outside without adding any extra shielding member to the device. CONSTITUTION:A magnetic head 14 is fitted to a rotary drum 21 through a substrate 13 and this drum 21 is fitted to an annular seat with screws. The annular seat 23 is fitted in shaft parts 22a and 22b of a stationary drum 22 through a small ball bearing 27 and also fixed axially by a rotatably supported pre-loaded base 32. In this case, the shaft part 22a may be pressed in the stationary drum 22. The pre-loaded base 32 is fixed to the shaft part 22a with a screw 53 to that an adequate axial force is applied to two bearings 26 and 27. Consequently, neither bearing 26 nor 27 has play to allow the rotary drum 21 to rotate smoothly, improving the rigidity of a rotating shaft.</p> |
