Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1994-01-27
1995-09-19
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367174, 310328, 310334, H04R 1700
Patent
active
054522676
ABSTRACT:
An acoustic transducer has an electrically energized crystal in contact with a flexible plate. The crystal drives the plate in a flexural mode. Particularly, the plate is oscillated so that different circular areas of the plate, referred to as nodes, do not vibrate. The nodes separate adjacent annular anti-node areas referred to as positive anti-nodes and negative anti-nodes which oscillate oppositely. An impedance matching material of uniform thickness is disposed between the plate and the surrounding medium to improve efficiency. To avoid cancellation of waves, concentric plastic layer rings are disposed between the impedance matching layer and the oscillating disk. The plastic rings act as a barrier to negative anti-nodes, thus eliminating cancellation between waves from the positive and negative anti-nodes.
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Eldred J. Woodrow
Magnetrol International Inc.
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