| 摘要 |
PURPOSE:To obtain a speaker which is simple construction and less-variance, and capable of wide band reproduction by mounting the first or the second resonance frequency node of a flat plate-shaped diaphragm on the upper end of a voice coil, by fixing it to the voice coil by means of such as bonding and by connecting the outer circumference edge of said diaphragm to a cone diaphragm through adhesives, etc. CONSTITUTION:It is desirable to provide a through hole 14 around a pole piece 13 with a plate with a pole piece. A ring-shaped magnet 15 and top plate 16 constitute a magnetic circuit 17, where a magnetic gap 18 is formed. A flat plate diaphragm 23 is fixed by means of adhesives on a voice coil at the first resonance node diameter D1 about 67% of the effective diameter D2 of the flat plate diaphragm 23, and its outer circumference is fixed by bonding to a cone diaphragm 22 through a corrugation edge 24. |
