| 摘要 |
A mechanical-to-acoustical transducer (10) has at least one actuator (12), preferably a piezo motor, that is coupled, generally perpendicularly, to one edge of a diaphragm (14) formed from a thin, flexible sheet material. The diaphragm (14) is fixed at a point spaced from the actuator (12) in the direction of its motion so that excursion of the actuator (12) is translated into a corresponding, mechanically-amplified, excursion of the diaphragm (14) - typically amplified five to seven times. The diaphragm (14) is curved, preferably parabolically, and to a small degree. The diaphragm (14), if optically clear, can be mounted on a frame (50) over a video display screen to provide a screen speaker. The actuators (12) are secured at one end to the frame (50) and at a free, movable end, to an edge of the diaphragm (14), generally at right angles. A gasket (35'') seals the edges of the diaphragm (14) to maintain an acoustic pressure gradient across the diaphragm (14).
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