US3689782A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic transducer for a piezoelectric line
Assignee: Thales SA
•
Filing: 1971-07-01
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Granted: 1972-09-05
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Expires: 1991-07-01
Abstract
Abstract Piezoelectric transducer for creating alternating mechanical stresses in a piezoelectric material, in which said mechanical stresses are obtained by depositing electric charges on the surface of the piezoelectric material. These charges are those of electron beams impinging on the piezoelectric material, whose intensity are such and whose impact zones are so distributed at the surface of the piezoelectric material that the alternating mechanical stresses created by the electron beams are cophasal with the mechanical wave propagating within the piezoelectric material.
Inventors
- 👤 Bernard Epszein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:43
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0607; B06B1/0622
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
210 words
In a device for converting an alternating quantity into a mechanical quantity propagating through a piezoelectric solid block (7), having: a. an electron source (1) from which is emitted an electron beam, said electron beam impinging on said block; b. a first group of electrodes (3) for modulating the intensity of said electron by an alternating electrical quantity; c. a second group of electrodes (8, 9, 13, 14), for concentrating and deflecting said beam; and, d. charge means for fixing the potential of the surface on which the beam inpinges to a value depending upon the intensity of the beam; the improvement therein which comprises: e. a direct voltage source with negative and positive poles; f. a third group of electrodes (4) having slots which split said beam into several separate beams, said separate beams when impinging on said block serving to define said block into several impact zones, said electron source being connected to said negative pole, said third group of electrodes being conNected to said positive pole; and g. a second voltage source, said first group of electrodes being connected thereto, said second voltage source bringing the potential of said first group of electrodes with respect to said electron source, to a value which undergoes variations versus time.
Claim 2
Dependent Claim
210 words
In a device for converting an alternating quantity into a mechanical quantity propagating through a piezoelectric solid block (7), having: a. an electron source (1) from which is emitted an electron beam, said electron beam impinging on said block; b. a first group of electrodes (3) for modulating the intensity of said electron by an alternating electrical quantity; c. a second group of electrodes (8, 9, 13, 14), for concentrating and deflecting said beam; and, d. charge means for fixing the potential of the surface on which the beam inpinges to a value depending upon the intensity of the beam; the improvement therein which comprises: e. a direct voltage source with negative and positive poles; f. a third group of electrodes (4) having slots which split said beam into several separate beams, said separate beams when impinging on said block serving to define said block into several impact zones, said electron source being connected to said negative pole, said third group of electrodes being conNected to said positive pole; and g. a second voltage source, said first group of electrodes being connected thereto, said second voltage source bringing the potential of said first group of electrodes with respect to said electron source, to a value which undergoes variations versus time.
Claim 3
Dependent Claim
27 words
A device as claimed in claim 1, in which said first group of electrodes comprises at least one electrode forming part of a high frequency resonant cavity.
Claim 4
Dependent Claim
24 words
A device as claimed in claim 2, in which, the electron source is integral part said resonant cavity and is located opposite said electrode.
Claim 5
Dependent Claim
45 words
A device as claimed in claim 2 in which said source is located apart said resonant cavity, on the side opposite the side where is located said block, and a drift space provided beyond said cavity on the path of said beam towards said block.
Claim 6
Dependent Claim
20 words
A device as claimed in claim 1, in which said parallel slots are directed perpendicularly to the direction of propagation.
Claim 7
Dependent Claim
68 words
A device as claimed in claim 1, wherein said piezoelectric solid block is made of material having secondary electron emission properties, said charge means consisting of a fourth group of electrodes located close to the surface of said block on which the electron beam impinges, said fourth group having applied a direct voltage with regard to said cathode, in order to act as a collector for secondary electrons.
Claim 8
Dependent Claim
41 words
A device as claimed in claim 1 in which said charge means consists of a thin resistive metal film applied upon the surface of said block, said metal film having applied a direct positive voltage with regard to said electron charge.
Claim 9
Dependent Claim
39 words
A device as claimed in claim 1 said third group of electrodes (4) having said slots so disposed that the defined zones are spaced at intervals which are multiples of the mechanical wavelength of the material of said block.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |