US3886529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-acoustic memory device
Assignee: Thales SA
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Filing: 1973-12-26
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Granted: 1975-05-27
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Expires: 1993-12-26
Abstract
Abstract A piezoelectric substrate (1) exhibiting sufficient electric isolation is equipped at its both ends with an input transducer (2) and an output transducer (3). There is formed a permanent electrostatic image of the acoustic wave induced at the surface of substrate (1) by a given high frequency signal applied at the input transducer, by means of an electron beam (4), deflected toward the substrate so as to impinge on the the zone covered by the acoustic wave. Readout of this image is obtained by a second electron bombardment. Deflection of the beam (50) is achieved by means of a difference in potential applied between the electrode (5) and elements (60, 61, 62 . . . ). The device enables a train of signals applied at the input transducer to be addressed and coded.
Inventors
- 👤 Alain Bert
- 👤 Gerard Kantorowicz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:52
CPC Classifications
G; G11; G11C; G11C13/00; G11C13/04; G11C13/047; G11C21/00; G11C21/02; G11C21/023; G11C27/00; G11C27/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
151 words
An electro-acoustic memory device comprising a piezoelectric substrate; an input and an output transducer mounted thereon at its both ends for transmitting high frequency signals from said input transducer toward said output transducer by means of elastic waves propagating along the surface of the substrate; means for sweeping said surface with a beam of electrons which interact with said elastic wave and provide a record of said wave by providing a potential distribution on said surface, said sweeping means also subsequently sweeping said surface with a beam of electrons to cancel said potential distribution and stimulate elastic waves propagating on said substrate, and which are a reproduction of the recorded wave; and including means for selectively operating said sweeping means to impinge the electron beam on different zones of said surface disposed side by side in the direction of said wave propagation in a selective fashion and in a preferential order.
Claim 2
Dependent Claim
151 words
An electro-acoustic memory device comprising a piezoelectric substrate; an input and an output transducer mounted thereon at its both ends for transmitting high frequency signals from said input transducer toward said output transducer by means of elastic waves propagating along the surface of the substrate; means for sweeping said surface with a beam of electrons which interact with said elastic wave and provide a record of said wave by providing a potential distribution on said surface, said sweeping means also subsequently sweeping said surface with a beam of electrons to cancel said potential distribution and stimulate elastic waves propagating on said substrate, and which are a reproduction of the recorded wave; and including means for selectively operating said sweeping means to impinge the electron beam on different zones of said surface disposed side by side in the direction of said wave propagation in a selective fashion and in a preferential order.
Claim 3
Dependent Claim
93 words
An electro-acoustic memory device according to claim 1, wherein said substrate is positioned on a support in inclined relation with said support, wherein said sweeping means comprise a source of electrons and electrode means including a plurality of electrodes cooperating with said source for producing said beam, said electrode means comprising first means for directing that beam toward said support and second means for deflecting a part of said beam toward said substrate so as to make said part to impinge onto said zones in a selective fashion and in a preferential order.
Claim 4
Dependent Claim
68 words
An electro-acoustic memory device according to claim 2, wherein said second means comprise two deflecting plates, one of which, a first plate, is of one piece and the other of which, a second plate, is made of a plurality of pieces insulated from one another and means to apply a difference in potential between said first plate and at least one of the pieces of said second plate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |