| 摘要 |
PROBLEM TO BE SOLVED: To use the push button switch of a bell device by radio without worrying about the material of a wall surface or the influence of a fingertip. SOLUTION: On the opposing surface of a printed board 14 where an antenna pattern which is also the load coil 7 of the oscillation circuit of a remote control transmitter 2 is formed, two planar metal bodies 13 are arranged so as to have capacitance and the load coil 7 is arranged between the two metal bodies 13.
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