| 摘要 |
PURPOSE:To obtain speaker which has a flat acoustic pressure frequency characteristic and a wide reproducing band, by combining plural diaphragms to obtain a plane acoustic radiating surface and reinforcing the junction part between diaphragms in the radial direction and the peripheral direction. CONSTITUTION:The first diaphragm 1 is conical and is provided with V grooves 1f formed with angles 1a, 1b... radially and continuously in the peripheral direction, and a flat part 1e provided in the outside peripheral edge is orthogonal to the axial direction. The second diaphragm 2 has a plane part 2f orthogonal to the axial direction in the outside peripheral part and is provided with inverted triangular prisms continuously and radially, and triangular parts formed with angles 2a, 2a', and 2b are fitted to V grooves 1f of the diaphragm 1 respectively and are connected to their centers to form approximately inverted triangles, and reinforcing walls 2c in the peripheral direction are formed in middles of V grooves 1f. Diaphragms 1 and 2 are adhered to each other in this manner, and a ring-shaped surface plate is adhered to the whole of the surface except an inverted dome part 2e in the center. |
