| 摘要 |
PROBLEM TO BE SOLVED: To solve such problems that response characteristics of a speaker apparatus are degraded by influences of back pressure fluctuation within a speaker unit since a conventional back-supported speaker is covered with a columnar shaft, diaphragm, magnetic circuit or the like and the inside of the speaker unit has a structure in which air is hardly permeated, and that there is possibility to incur the thermal break of a voice coil since heat generated from the voice coil is hardly radiated and the heat is accumulated to elevate the temperature within the speaker unit. SOLUTION: A shaft for fixing the speaker unit to the casing of a speaker is linked to a pole forming a part of the magnetic circuit of the speaker unit, and the pole and shaft are formed with holes communicating in an axial direction in axial center portions. COPYRIGHT: (C)2008,JPO&INPIT
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