PIEZOELECTRIC TRANSDUCER
First Claim
1. A transducer element, comprising:
- a cell member including at least one cavity;
a piezoelectric layer coupled to a periphery of the cell member so as to isolate the cavity from an external fluid medium, the piezoelectric layer having a concave shape and including an external surface and an internal surface, wherein a central portion of the piezoelectric layer is freely suspended over the cavity; and
a first electrode attached to the external surface of the piezoelectric layer and a second electrode attached to the internal surface of the piezoelectric layer, the first and second electrodes coupled to an electrical circuit.
1 Assignment
0 Petitions
Accused Products
Abstract
A miniature piezoelectric transducer element is provided, comprising; (a) a cell element having a cavity; (b) a flexible piezoelectric layer attached to the cell member, the piezoelectric layer having an external surface and an internal surface, the piezoelectric layer featuring such dimensions so as to enable fluctuations thereof at its resonance frequency upon impinging of an external acoustic wave; and (c) a first electrode attached to the external surface and a second electrode attached to the internal surface of the piezoelectric layer. At least one of the electrodes may be specifically shaped so as to provide a maximal electrical output, wherein the electrical output may be current, voltage or power. A preferred shape of the electrodes includes two cores interconnected by a connecting member. The transducer element may function as a transmitter.
-
Citations
20 Claims
-
1. A transducer element, comprising:
-
a cell member including at least one cavity; a piezoelectric layer coupled to a periphery of the cell member so as to isolate the cavity from an external fluid medium, the piezoelectric layer having a concave shape and including an external surface and an internal surface, wherein a central portion of the piezoelectric layer is freely suspended over the cavity; and a first electrode attached to the external surface of the piezoelectric layer and a second electrode attached to the internal surface of the piezoelectric layer, the first and second electrodes coupled to an electrical circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. A biosensor for implantation within a body, the biosensor comprising:
-
a sensor; and a transducer element coupled to the sensor, the transducer element including; a cell member including at least one cavity; a piezoelectric layer coupled to a periphery of the cell member so as to isolate the cavity from an external fluid medium, the piezoelectric layer having a concave shape and including an external surface and an internal surface, wherein a central portion of the piezoelectric layer is freely suspended over the cavity; and a first electrode attached to the external surface of the piezoelectric layer and a second electrode attached to the internal surface of the piezoelectric layer, the first and second electrodes coupled to an electrical circuit.
-
-
20. A system for transmitting information within a body, the system comprising:
-
a sensor; a transducer element coupled to the sensor, the transducer element including; a cell member including at least one cavity; a piezoelectric layer coupled to a periphery of the cell member so as to isolate the cavity from an external fluid medium, the piezoelectric layer having a concave shape and including an external surface and an internal surface, wherein a central portion of the piezoelectric layer is freely suspended over the cavity; and a first electrode attached to the external surface of the piezoelectric layer and a second electrode attached to the internal surface of the piezoelectric layer, the first and second electrodes coupled to an electrical circuit; and a remote receiver configured to receive an acoustic wave transmitted by the transducer element.
-
Specification