| 摘要 |
PURPOSE:To obtain a satisfactory reproduction sound by providing a holding frame at the outer periphery of a diaphragm on a holding member of an electrode and holding only the outer periphery of the diaphragm. CONSTITUTION:Electrodes 3a-3c are fitted in and held in recessed parts 11a- 11c provided in accordance with shapes of said electrodes 3a-3c on the surface of an insulating material 11, and insulated each other by an insulating part 12. On the other hand, a diaphragm 1 is disposed oppose to the electrodes 3a-3c, and only its outer periphery is fixed and held by a holding frame 13. As a result, vibrations are given to respective parts of the diaphragm 1 corresponding to the electrodes 3a-3c, and the entire transducer vibrates, using these vibrations as a total sum. A frequency characteristic of each unit of the transducer retains the prescribed level difference in an overall band, and a normal reproduction sound can be obtained in all frequency bands. |
