Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
78 words
An underwater sound transducer including a casing having at least one wall which comprises a diaphragm, means for pressurising the casing, and a diaphragm actuator comprising at least one thin strut composed of piezo-electric material, and electrical terminal means contacting opposite faces of the strut, or each of the struts, wherein the strut, or each of the struts, is attached at one end thereof to the diaphragm and is arranged to vibrate the diaphragm by the piezo-electric effect.
Claim 2
Dependent Claim
78 words
An underwater sound transducer including a casing having at least one wall which comprises a diaphragm, means for pressurising the casing, and a diaphragm actuator comprising at least one thin strut composed of piezo-electric material, and electrical terminal means contacting opposite faces of the strut, or each of the struts, wherein the strut, or each of the struts, is attached at one end thereof to the diaphragm and is arranged to vibrate the diaphragm by the piezo-electric effect.
Claim 3
Dependent Claim
33 words
An underwater sound transducer as claimed in claim 1, including two diaphragms, the one facing the other, and wherein each ofthe said thin struts is attached at its opposite ends to the diaphragms.
Claim 4
Dependent Claim
36 words
An underwater sound transducer as claimed in claim 1 or claim 2 wherein the strut or struts together with the diaphragm or diaphragms, form a resonant structure within the range of vibration frequencies of the transducer.
Claim 5
Dependent Claim
19 words
An underwatersound transducer as claimed in any previous claim wherein the, or each strut, comprises a thin walled strip.
Claim 6
Dependent Claim
22 words
An underwater sound transducer as claimed in claim 4 wherein the thin walled strip is curved to provide a low stiffness member.
Claim 7
Dependent Claim
24 words
An underwater sound transducer as claimed in any of claims 1 to claim 3 wherein the, or each strut, comprises a thin walled tube.
Claim 8
Dependent Claim
17 words
An underwater sound transducer as claimed in any previous claim wherein the piezo-electric material is polyvinylidene fluoride.
Claim 9
Dependent Claim
29 words
An underwater sound transducer as claimed in any previous claim wherein the electrical terminal means comprise spring contacts which are urged agains opposite faces of the, or each, strut.
Claim 10
Dependent Claim
13 words
An underwater sound transducer substantially as described herein with reference to the drawings.
Claim 11
Dependent Claim
13 words
An underwater sound transducer substantially as described herein with reference to the drawings.