| 摘要 |
PURPOSE:To obtain a plane electroacoustic transducer having a excellent sensitivity and a superior high-frequency characteristics without spoiling the effective area of a perforated magnet by forming a radial groove in the surface of a magnet facing oppositely to a diaphragm having the perforated magnet. CONSTITUTION:A couple of a magnet 5 and a 5 are arranged in parallel and spaced at a constant interval interposing a spacer 4 consisting of an electric insulator and a plane coil diaphragm 3 formed by winding a coil on a thin electric insulating film is held parallel between the magnets by the spacer 4. Each magnet 5 is made of a disk body which has specified thickness and is magnetized to the different polarities at a center part and an outer circumferential part, and plural sound holes 1 are pierced in this disk body. Further, plural grooves 6 are formed radially in the surface side facing oppositely to the diaphragm 3 of each magnet. A diaphragm radius of air in the gap is short-circuited to suppress an increase in viscous resistance in a high frequency range, thereby preventing effectively the overattenuation of the oscillation system of the electroacoustic transducer. |
