US3851192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromechanical transducers using coupled ferroelectric-ferroelastic crystals
Assignee: EIDP Inc
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Filing: 1973-12-27
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Granted: 1974-11-26
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Expires: 1993-12-27
Abstract
Abstract The coupled ferroelectric-ferroelastic properties of crystals such as gadolinium molybdate are used to provide an effectively high-compliance mechanical-electrical transducer whereby mechanical displacement of the crystal results in displacement of a zigzag domain wall. Charge proportional to the displacement flows between electrodes on the two surfaces of the crystal intersected by the wall through an electrical impedance analogous to the mechanical function. Appropriate voltage is developed or supplied across the impedance to measure or develop the mechanical function.
Inventors
- 👤 R Flippen
- 👤 E Hogan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:21
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/20; H10N30/208; G; G01; G01B; G01B7/00; G01B7/16; G01H; G01H11/00; G01H11/06; G01P; G01P15/00; G01P15/02; G01P15/08; G01P15/09; G01P3/00; G01P3/42; H01; H01G; H01G7/00; H01G7/02; H01G7/025
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
98 words
An electromechanical transducer comprising a crystal plate of a coupled ferroelectric/ferroelastic material exhibiting uniaxial properties cut with faces essentially perpendicular to the plane of domain walls, said plate being divided into two domains by a zig-zag domain wall, said plate having an electrode on each opposing face of said plate; a mechanical system coupled to said plate whereby displacement by said mechanical system moving said zig-zag domain wall; said electrodes being connected in a circuit including a series electrical impedance corresponding to a selected mechanical function, whereby a voltage across said impedance is correlated with said mechanical function.
Claim 2
Dependent Claim
98 words
An electromechanical transducer comprising a crystal plate of a coupled ferroelectric/ferroelastic material exhibiting uniaxial properties cut with faces essentially perpendicular to the plane of domain walls, said plate being divided into two domains by a zig-zag domain wall, said plate having an electrode on each opposing face of said plate; a mechanical system coupled to said plate whereby displacement by said mechanical system moving said zig-zag domain wall; said electrodes being connected in a circuit including a series electrical impedance corresponding to a selected mechanical function, whereby a voltage across said impedance is correlated with said mechanical function.
Claim 3
Dependent Claim
22 words
Device of claim 1 where said crystal plate is a crystal of a rare earth molybdate having the Beta ''-gadolinium molybdate structure.
Claim 4
Dependent Claim
15 words
Device of claim 1 where said crystal plate is a plate of Beta ''-gadolinium molybdate.
Claim 5
Dependent Claim
20 words
Device of claim 3 where said impedance is a resistance, and said voltage is proportional to the velocity of displacement.
Claim 6
Dependent Claim
20 words
Device of claim 4 where said resistance has a value substantially less than the equivalent resistance of the electroded plate.
Claim 7
Dependent Claim
19 words
Device of claim 3 where said impedance is a capacitor and said voltage is proportional to the mechanical displacement.
Claim 8
Dependent Claim
21 words
Device of claim 6 where said capacitance has a value substantially greater than the equivalent capacitance of the electroded crystal plate.
Claim 9
Dependent Claim
23 words
Device of claim 3 where said impedance is an inductance and said voltage is proportional to the mechanical acceleration applied to said plate.
Claim 10
Dependent Claim
20 words
Device of claim 8 wherein said inductance has an impedance substantially less than the equivalent resistance of the electroded plate.
References Cited (Backward Citations)
US3437432A
Cited
US3773898A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |