| 摘要 |
<p>PURPOSE:To obtain high frequency blocking effect by a method wherein a tuning apparatus is connected to a secondary coil magnetically coupled to a main coil (primary coil) and electrostatically screened therefrom the electric resonance is effected with high frequency to increase impedance from the primary coil standpoint. CONSTITUTION:A main coil 1 is contained in a container 4 formed of insulating material and a secondary coil 2 is wound on the outside of the container 4 to magnetically couple the secondary coil to the main coil 1 and then a tuning apparatus 3 is connected to the secondary coil 2. The container 4 is coated with, for instance carbon paint so as to screen the secondary coil 2 electrostatically. In this blocking coil, the tuning apparatus is not connected to the main coil in paralle and the main coil is contained in the container made of insulating material, the secondary coil being wound on the outside of the container. Consequently, no eddy current is generated in the container, which is therefore not heated and the main and secondary coils are coupled together effectively and magnetically.</p> |
