| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a bone conduction device capable of realizing a high output, despite its small size and light weight.SOLUTION: The bone conduction device includes: a bottomed cylindrical body 2 made from a magnetic material, with an opening at the top end and a peripheral wall 2c completely surrounding the opening; a diaphragm 3 laid over the opening 2a of the cylindrical body 2; a magnet 5 fixed on the bottom surface 3c side of the diaphragm 3, at least one part of the magnet 5 being positioned inside the cylindrical body 2 lower than the position of the opening at the top end of the cylindrical body 2; a yoke 4 erected on an inner bottom surface 2b of the cylindrical body 2, whose top surface 4a faces the bottom surface 5b of the magnet 5 via a gap; and a voice coil 6 disposed around the yoke 4 in the cylindrical body 2.</p> |
