Elongated‐pattern sonic transducer

A sonic transducer (10) includes an elongated diaphragm (12) secured to a base (14) by a clamping member (16). The shapes of the surfaces (26, 30) by which the base (14) and clamping element (16) engage the diaphragm (12) are different at the end regions (28) from what they are in the side regions (32). The result is a more-rigid clamping at the ends than at the sides, which causes the lengthwise and widthwise stiffnesses of the diaphragm to be more nearly equal and thus the sound production from various regions of the diaphragm to be more nearly in phase than they would be if the clamping were uniform.