| 摘要 |
PROBLEM TO BE SOLVED: To provide a helmet having a helmet body efficiently driven as a diaphragm. SOLUTION: A helmet 1 comprises a helmet body 3, a diaphragm part 31 having a cylindrical voice coil-wound element 51 wound with a voice coil 47, driving units 5L and 5R formed to have a magnetic member 45 which is inserted into the inside of the voice coil-wound element 51 to have a relation with the voice coil-wound element 51 without contacting thereto, and a housing 9 fixing the magnetic member 45 of the driving units 5L and 5R to the helmet body 3. The magnetic member 45, in a state fixing on the helmet body 3, contacts the helmet body 3 so as to drive the helmet body 3 as a diaphragm. COPYRIGHT: (C)2005,JPO&NCIPI
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