| 摘要 |
PURPOSE:To widen the frequency band of a reproduced sound, by shaping one of diaphragms in the inside circumferential side and the outside circumferential side of a ring-shaped speaker at least into a curved form. CONSTITUTION:In a ring-shaped speaker where a diaphragm 14 in the inside circumferential side and a diaphragm 15 in the outside circumferential side are so arranged that their section is a V-form and driving parts such as a bobbine 20 and a voice coil 21 are connected to the apex of this V-form. At lease one of diaphragms 14 and 15, is curved to the front or the back of the speaker into an arc form according as going from one end to the other in the breadth-wise direction. |
