| 摘要 |
PURPOSE:To obtain an excellent linearity to a driving force, by providing a corrugation having a crest or a trough on a radius along a circumference in addiation to a concentric corrugation having a crest or a trough along a radial direction. CONSTITUTION:The concentric corrugation 3 is constituted in a center suspension for a speaker, and for example, four trough corrugations 5 and four crest corrugations 6 are provided on the radial line. Further, the corrugations 5, 6 are arranged alternately on the circumference. The width of the corrugations 5, 6 is formed to be wider gradually from the inner circumference toward the outer circumference. The expanding and contracting performance toward radial and an circumferential direction is improved even at a small diameter through the constitution in this way and the linearity of displacement to the drive force is improved. Further, the symmetry of displacement toward a positive and a negative direction is improved. |
