| 摘要 |
PROBLEM TO BE SOLVED: To provide a speaker which suppresses conduction of heat of a voice coil to a diaphragm and withstands a large input. SOLUTION: The speaker 1 includes a heat sink 13 joined to a front end portion of a bobbin 7 and a coupler 14 joined to a front surface portion of the heat sink 13 and a rear surface potion of the diaphragm 11. The heat sink 13 has an internal bottom portion which is sectioned in a recessed shape, and a first collar portion which extends from the front end potion of the internal bottom portion to an outer circumference and has its rear surface brought into contact with the front end portion of the bobbin, and the coupler 14 has a diaphragm reception portion joined to the rear surface portion of the diaphragm 11, an internal leg portion which is disposed behind an inner peripheral portion of the diaphragm reception portion to form a cavity portion in the center, and an external leg portion which is disposed behind an outer circumferential portion of the diaphragm reception portion. The internal leg portion of the coupler 14 is joined to the internal bottom portion of the heat sink 13 and the external leg portion of the coupler 14 is joined to an outer circumferential portion of the first collar portion. In this structure, the heat generated by the voice coil 8 can efficiently be radiated through the heat sink 13. COPYRIGHT: (C)2009,JPO&INPIT
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