| 摘要 |
PROBLEM TO BE SOLVED: To prevent an abnormal noise occurring by bringing a voice coil into contact with a center pole in a speaker. SOLUTION: In the speaker 1 for detecting an electrostatic capacity formed between a voice coil 4 and a center pole 5 to output it as an electric signal, there is provided a nonconductive member 6 on at least one side of a belt-shaped protrusion 5b formed on an outer peripheral face of a main body 5a of the center pole 5. COPYRIGHT: (C)2009,JPO&INPIT |
