| 摘要 |
PURPOSE:To obtain a speaker whose sound pressure frequency characteristic is flat with low cost and high efficiency by using a triangular pyramid shaped cone diaphragm for the diaphragm of the titled speaker and adopting a triangle shape for the frame so as to improve the space factor. CONSTITUTION:The slope of cone faces a, b of the triangle pyramid shaped cone diaphragm differs from each other with respect to a center line (h), and the diaphragm face vibrating air is asymmetric, then the sound radiated from the faces a, b has a phase difference but the phase differs from each face, then the front chamber effect is reduced. Moreover, a triangle dust cap 14 is arranged on the upper face of the diaphragm 10 and the dust cap structure where the adhered face with a flat part 10a is placed in the direction of frame in comparison with the corner 10b of the diaphragm 10 is adopted to enhance the rigidity of the cone face and the speaker whose sound pressure frequency characteristic is flat is obtained with high efficiency while suppressing the production of a peak dip.
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