| 摘要 |
PURPOSE:To decrease the signal transmission loss and to reduce the effect of external noise by providing coaxially a stator and a rotor of a long cylindrical rotary transformer in a drum cylinder and building in an amplifier in a air gap between the rotary transformer and the drum cylinder. CONSTITUTION:A stator 13 of a rotary transformer 12 and an amplifier circuit 21 are both provided closely in the drum cylinder 3. Thus, in connecting the stator 13 of the rotary transformer 12 and the amplifier circuit 21, a very short lead wire is enough and the signal transfer path between the rotary transformer 12 and the amplifier circuit 21 is much decreased. Thus, the signal transmission loss is much decreased. Since the rotary transformer 12 and the amplifier circuit 21 are built in the drum cylinder 3, the effect of external noise is decreased by the shield effect of the drum cylinder 3. |
