| 摘要 |
PURPOSE:To prevent disturbance of sound pressure frequency characteristics even when a composite type plane diaphragm is used and enable high-fidelity reproduction by setting the shape of plane diaphragms for low-pitched sound and for high-pitched sound as a composite type plane diaphragm to a combination of annular and square, and square frame-shape and circular. CONSTITUTION:The shape of outer periphery of a frame 6 is made circular, and accordingly, an edge 14 for low-pitched sound is annular and a plane diaphragm for low-pitched sound 15 is also annular. However, a square opening is provided at the center. A square plane diaphragm for high-pitched sound 17 is incorporated at the center of the plane diaphragm for low-pitched sound 15 through a square frame shaped edge for high-pitched sound 16. Accordingly, the distance in the radiation direction and radial direction between the periphery of the plane diaphragm for high-pitched sound 17 and the periphery of the plane diaphragm for low-pitched sound 15 is not fixed. Accordingly, disturbance of wave face of reflection, etc. at the periphery is not limited to a specific frequency and scattered. |
