摘要 |
<p>PROBLEM TO BE SOLVED: To make an electronic circuit a small size and light weight by taking out as an electric signal with a rod shaped coil the change in a magnetic flux excited by the change in a current flowing through a winding of a loop coil, by inserting a rod shaped coil wound around a winding into a central part of the loop coil around which the winding is wound. SOLUTION: A rod antenna coil 20 is inserted into a central part of a troidal choke coil 10. In the antenna coil 20 a winding 20b is wound on a rod shaped core 20a spirally longitudinally thereof. In the choke coil 10 the winding 10b is spirally wound with a loop direction of the troidal core 10a or a central axis direction of the core taken as the center of winding, but the construction can be regarded in a macroscopic manner to be a one thick winding. Thus, the change in a magnetic flux excited by the change in a current flowing through the winding 10b of the choke coil 10 can be taken out as an electric signal through the antenna coil 20.</p> |