| 摘要 |
An electroacoustic transducer has a diaphragm body including a planar diaphragm having an outer periphery in an elongated generally elliptical shape with semicircular ends and major and minor axes, and an elastometic edge having an outer periphery of an elongated generally elliptical shape with semicircular ends and major and minor axes aligned with the major and minor axis of the diaphragm, the edge being wider along the major axis than along the minor axis and coupled at an inner periphery to the outer periphery of the diaphragm. The edge has a concave cross-section perpendicular to the diaphragm. A cylindrical voice coil bobbin is secured at one end to a central area of the diaphragm, and a voice coil is wound on the voice coil bobbin. A molded resin frame having a generally rectangular shape includes an opening conforming in shape to and receiving the diaphragm body, and is connected to and supports an outer periphery of the edge. The frame includes a central base containing a magnetic circuit for driving the diaphragm in response to an electrical signal applied to the voice coil.
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