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EP0137529A2
Expired / Lapsed
EP
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Method for fabricating composite electrical transducers
Assignee: Koninklijke Philips NV
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Filing: 1984-08-13
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Granted: —
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Expires: 2004-08-13
Abstract
Abstract A simplified method for fabricating composite transducers by bonding together plates of active (12, 14, 16, 18) and passive (11, 13, 15, 17, 19) materials to form a laminated block (10). The active material is preferably a piezoelectric ceramic. Thereafter, a series of cuts are made in the laminated block to obtain a laminated plate (20) wherein strips (22, 24, 26, 28) of active material are separated from one another by strips (21, 22, 25, 27, 29) of passive material. Laminated plates (20a, 20b, 20c, 20d) and plates (31, 32, 33, 34, 35) of passive material are bonded together to form a block (30) of composite material from which transducers can be cut. Each transducer comprises a matrix of isolated active regions surrounded by passive material. The method provides composite transducers having fine structures which can be produced without the difficulty of assembling many small rods or sawing deep, narrow grooves.
Inventors
- 👤 John Zola
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 05:25
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0607; B06B1/0622; B06B1/0629; H; H10; H10N; H10N30/00; H10N30/01; H10N30/09; H10N30/092; H10N30/08; H10N30/085; H10N30/088; Y; Y10; Y10S; Y10S310/00; Y10S310/80; Y10S84/00; Y10S84/24; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1059; Y10T156/1062; Y10T156/1075; Y10T29/00; Y10T29/42
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
129 words
A method for manufacturing composite transducers comprising the steps of: bonding together a plurality of plates (12, 14, 16, 18) of a first, electrically active material with plates (11, 13, 15, 17, 19) of a second material to form a first laminated block (10) having alternating regions of the first and second material and cutting the laminated block along planes which form an angle with the interfaces of the plates to obtain a plurality of laminated plates (20), characterized in that the laminated plates (20a, 20b, 20c, 20d) are bonded together with a plurality of plates (31, 32, 33, 34, 35) of the second material to form a second laminated block (30) which comprises strips of the first material which are wholly surrounded by regions of the second material.
Claim 2
Independent Claim
129 words
A method for manufacturing composite transducers comprising the steps of: bonding together a plurality of plates (12, 14, 16, 18) of a first, electrically active material with plates (11, 13, 15, 17, 19) of a second material to form a first laminated block (10) having alternating regions of the first and second material and cutting the laminated block along planes which form an angle with the interfaces of the plates to obtain a plurality of laminated plates (20), characterized in that the laminated plates (20a, 20b, 20c, 20d) are bonded together with a plurality of plates (31, 32, 33, 34, 35) of the second material to form a second laminated block (30) which comprises strips of the first material which are wholly surrounded by regions of the second material.
Claim 3
Dependent Claim
17 words
A method as claimed in Claim 1, characterized in that the first material is a piezoelectric ceramic.
Claim 4
Dependent Claim
23 words
A method as claimed in Claim 2, characterized in that the second material is an electrical insulator which does not have piezoelectric properties.
Claim 5
Dependent Claim
15 words
A method as claimed in Claim 3 characterized in that the second material is glass.
Claim 6
Dependent Claim
18 words
A method as claimed in Claim 2, characterized in that the first material is a lead zirconium titanate.
Claim 7
Dependent Claim
22 words
A method as claimed in Claim 1, characterized in that the plates (11...19) of the first and second materials are flat plates.
Claim 8
Dependent Claim
56 words
A method as claimed in Claim 1, characterized in that it further comprises the step of slicing said second laminated block (30) perpendicular to the strips of the first material to form a thin, composite piezoelectric plate and applying two or more electrodes (45, 50) to surfaces of said plate to form a composite piezoelectric transducer.
Claim 9
Dependent Claim
34 words
A method as claimed in Claim 7, characterized in that it comprises the step of applying at least three electrodes to the surfaces of said plate to form an array of composite transducer elements.
Claim 10
Independent Claim
28 words
A method as claimed in any one of Claims 1-8, characterized in that at least some of the plates of the first and/or second material are tapered plates.
Claim 11
Dependent Claim
59 words
A composite piezoelectric transducer comprising a plurality of regions (80) of a first piezoelectric material disposed in a matrix of a second material, wherein the regions of the first material are isolated, one from another by regions of the second material, characterized in that the regions (80) of the first material are randomly or pseudorandomly distributed in the matrix.
Claim 12
Dependent Claim
59 words
A composite piezoelectric transducer comprising a plurality of regions (80) of a first piezoelectric material disposed in a matrix of a second material, wherein the regions of the first material are isolated, one from another by regions of the second material, characterized in that the regions (80) of the first material are randomly or pseudorandomly distributed in the matrix.
References Cited (Backward Citations)
No citation records indexed.
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