Patent US3624465A successfully refreshed from Google Patents.
US3624465A
Expired / Lapsed
US
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Heterojunction semiconductor transducer having a region which is piezoelectric
Assignee: RCA Corp
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Filing: 1968-06-26
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Granted: 1971-11-30
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Expires: 1988-06-26
Abstract
Abstract A stress sensitive semiconductor device having two adjacent semiconductor regions at least one of which is piezoelectric, with a PN-heterojunction between the regions. Upon application of stress to the heterojunction, the polarization of the piezoelectric semiconductor is altered to modulate current flow across the PN junction.
Inventors
- 👤 Robert M Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:38
CPC Classifications
H; H04; H04R; H04R23/00; H04R23/006
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
14 words
A transducer according to claim 1, wherein said at least one region is ferroelectric.
Claim 2
Dependent Claim
21 words
A transducer according to claim 1, wherein said at least one region is piezoelectric and said stimulus comprises an applied force.
Claim 3
Dependent Claim
26 words
A transducer according to claim 1, wherein said at least one region comprises cadmium selenide, cadmium sulfide, arsenic sulfide, arsenic selenide, antimony sulfide, or antimony selenide.
Claim 4
Dependent Claim
14 words
A transducer according to claim 5, wherein the other of said regions comprises selenium.
Claim 5
Dependent Claim
20 words
A transducer according to claim 6, wherein said selenium, in the vicinity of said interface, has a hexagonal crystal structure.
Claim 6
Dependent Claim
23 words
A transducer according to claim 7, wherein said regions have closely matching crystal structures and lattice constants in the vicinity of said junction.
Claim 7
Dependent Claim
33 words
A transducer according to claim 4, further comprising a flexible substrate, said regions comprising polycrystalline layers successively deposited on the substrate, said force being applied to said interface by flexing of said substrate.
Claim 8
Dependent Claim
37 words
A transducer according to claim 9, wherein said output means includes (i) first and second electrodes electrically coupled to said first and second regions respectively, and (ii) a source of potential difference electrically coupled to said electrodes.
Claim 9
Dependent Claim
25 words
A transducer according to claim 4, wherein said interface defines a PN-junction, said source being unidirectional and polarized so as to forward bias said PN-junction.
Claim 10
Dependent Claim
25 words
A transducer according to claim 10, wherein said interface defines a PN-junction, said source being unidirectional and polarized so as to reverse bias said PN-junction.
Claim 11
Dependent Claim
21 words
A transducer according to claim 12, wherein said output means is responsive to variation in the capacitance exhibited between said electrodes.
Claim 12
Dependent Claim
35 words
A transducer according to claim 6, further comprising: a substrate, said regions comprising overlying and underlying layers successively deposited on said substrate; and a film comprising tellurium disposed between said substrate and said underlying layer.
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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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |