Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1995-02-15
1997-05-13
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367176, 367151, 310326, 310327, 310335, H04R 1700
Patent
active
056299060
ABSTRACT:
An acoustic transducer includes a support structure which holds an acoustic pulse generator having both a front application face and a rear face. An acoustic absorber is attached to the rear face of the pulse generator. An acoustic isolator is positioned between the acoustic absorber and a support structure/heat sink. A preferred embodiment of the acoustic isolator includes at least a first material layer exhibiting a first acoustic impedance value, and a second material layer exhibiting a second acoustic impedance value. The second acoustic impedance value is substantially different from the first acoustic impedance value. A boundary between the first material layer and the second material layer causes multiple acoustic reflections of an acoustic pulse emanating from the rear face of the pulse generator. The first material layer and second material layer both exhibit substantial heat transfer capabilities. The acoustic isolator acts as a multiple reflective layer and prevents a substantial percentage of rear propagated acoustic energy from entering and being reflected by the support structure, thereby greatly reducing ultrasound display artifacts. A further embodiment of the acoustic isolator includes a single acoustic isolator layer and employs the support structure as a second layer.
REFERENCES:
patent: 4166967 (1979-09-01), Benes et al.
patent: 5267221 (1993-11-01), Miller et al.
Gurrie Francis E.
Ladd Larry A.
Sudol Wojtek
Eldred J. Woodrow
Hewlett--Packard Company
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