| 摘要 |
<p>An electro-acoustic transducer (90) including a substrate (100) and an active element (104) placed on the substrate (100). The active element forms a catenary curve or a hyperbolic curve to define a sealed chamber between the active element (104) and the substrate (100). The active element (104) includes a piezoelectric material (114), such as a polyvinylidene fluoride material. In one embodiment, the substrate (100) further comprises at least one cavity (106) wherein the active element (104) is placed over the at least one cavity (106) to form the sealed chamber. The at least one cavity (106) is, for example, of a substantially concave shape and the catenary curve is formed by the active element (104) at each said cavity (106). A diaphragm having a standoff ledge is used to provide the cavity (106) and the active element (104) is placed over the diaphragm. In another embodiment, at least two active elements, including a first active element and a second active element, are placed on the substrate to provide for discrete multiple transducers. Each of the active elements form catenary curves or hyperbolic curves to define a sealed chamber between the first active element and the substrate and between the second active element and the first active element.</p> |
