| 摘要 |
PURPOSE:To extend the piston region of coilbobbin-cone and to increase the frequency characteristics, by increasing the value of ratio of the cone Young's modulus toward the ridge line direction of the speaker cone to the cone density. CONSTITUTION:The magnetic circuit is formed with the yoke 1, magnet 2 and pole piece 3, the cylindrical coil bobbin 4 is located in this magnetic circuit, and the voice coil 5 is wound on the bobbin 4. Further, the cone 6 of fiber reinforced resin is bonded to one end of the bobbin 4. The end of the cone 6 is supported with the damper 7 at the frame 8 and the bobbin 4 is supported to the frame 8 with the damper 9. In this fiber resin made cone, since the ratio E/rho, cone Young's modulus to cone density rho is taken greater, at least 60vol% of the reinforced fibers are oriented to the ridge line direction of the cone. Thus, the frequency characteristics are increased and the original tone can be reproduced with fidelity. |
