| 摘要 |
PROBLEM TO BE SOLVED: To prevent a wearing person from feeling uncomfatable by receiving wireless signals modulated by sound signals by a receiver, extracting the sound signals and providing a breakable part to be broken by prescribed tensile force on a part of a loop coil for generating magnetic wave signals by the sound signals. SOLUTION: The loop coil 2 is composed of a coil main part 2a and a breakable coil part 2b and the coil main part 2a is made to pass through the hollow center part of a toroidal coil disposed inside a case and forms an annular shape. For the coil main part 2a, a conductor 7 for which metal wires are stranded in inserted in a flexible tube-like coating 6 composed of a high polymer material. For the breakable coil part 2b, both ends of the coil main part 2a are connected by a metal thin wire 8 and the tensile strength of the metal thin wire 8 is made extremely small compared to the conductor 7. In the state of putting the loop coil 2 around the neck and wearing this sound listening device, when the loop coil 2 is strongly pulled for some reason, the breakable coil part 2b breaks.
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