Voice transmission device

A voice transmission device comprising:

• a transducer configured to convert a predetermined electrical signal into a mechanical vibration;
• a transmission plate configured to be fixed to contact a head of a person during use to transmit the mechanical vibration to a bone of the head of the person;
• a housing that houses the transducer;
• and
• a ring member arranged to cover a side surface of the housing, wherein
• the transducer includes:
• a magnetostrictive element extending and contracting in a longitudinal direction according to a magnetic field;
• permanent magnets arranged at both ends of the magnetostrictive element in the longitudinal direction;
• and
• a coil arranged to surround a radial direction of the magnetostrictive element so that a current corresponding to the predetermined electrical signal flows through the coil,
• one of the permanent magnets arranged at one end of the magnetostrictive element is connected to the transmission plate,
• the housing includes:
• a housing portion that houses the transducer;
• and
• a counter mass having a predetermined mass, the counter mass being connected to the other of the permanent magnets arranged at the other end of the magnetostrictive element and connected to the housing portion,
• the ring member is configured to fix the voice transmission device by being supported by a predetermined wearable article to hold the side surface of the housing via a damper member formed of a thermoplastic elastomer,
• the ring member includes a protrusion protruding outward from each point at two points where a diameter and an outer circumference intersect,
• the protrusion is rotatably supported by the wearable article with an axis of the protrusion as a central axis, and
• the ring member is supported by the wearable article so that a gap is formed between an outer circumferential surface of the ring member and the wearable article.