| 摘要 |
PURPOSE:To simultaneously improve the linearity of driving system and supporting system and achieve the improvement in frequency characteristics by symmetrically disposing two speakers with diaphragms in-between and driving these in mutually anti-phases. CONSTITUTION:Speakers 2a, 2b of the same construction are opposedly superposed. Openings 4a, 4b are respectively provided in frames 3a, 3b and circular cylindrical permanent magnets 6a, 6b are fixed in the approximate center of yokes 5a, 5b. Poles 7a, 7b are fixed to their respective ends. Annular gaps 8a, 8b are constituted at respectively spacified spacings between the yokes 5a, 5b and the poles 7a, 7b, because of which the magnetic circuit of the arrow A in the speaker 2a and the magnetic circuit of the arrow B in the speaker 2B are respectively constituted by the magnetic fluxes generated from the magnets 6a, 6b. A foamed material 6 which is integrally formed to annular form by using expanded styrene or the like is interposed between the diaphragms 13a, 13b. The diaphragms are bonded and fixed on both side faces thereof. Thereby, the frequency characteristics of the speaker may be made extremely well. |
