| 摘要 |
An earphone construction for a wearer's ear, comprises an ear pad which is adapted to surround the ear and is advantageously constructed of a wedge-shaped tapered configuration and of annular form so that the inner edge bounding the inside of the ear along the cheekbone is of a narrower width than the outer portion and the outer portion tapers downwardly from the wide portion bounding the upper part of the ear to a lower portion adjacent the lower part of the ear which does not project outwardly from the head as much as the upper portion. At least one electroacoustic transducer is provided which includes a diaphragm which is surface-driven and which is mounted in, and supported at its periphery, on a transducer frame connected to the ear pad. The diaphragm is thus supported by the frame which also supports ferromagnetic plates on each side of the diaphragm having magnetic rods which are spaced from the respective sides of the diaphragm. A wall of the frame itself may include an electroacoustic transducer, particularly in those instances where a flat ear pad is employed. The diaphragm may advantageously comprise a thin, plastic foil sheet having a printed circuit or circuits defined thereon. Separate electrodes may advantageously be provided surrounding respective areas of the diaphragm and connected separately to transformers.
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