US3858065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Annular 3m class piezoelectric crystal transducer
Assignee: Becton Dickinson Electronics Co
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Filing: 1972-07-24
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Granted: 1974-12-31
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Expires: 1992-07-24
Abstract
Abstract The transducer of this invention utilizes an annular crystal of the 3m class operated in the shear mode with the shearing surfaces and the axis of the acceleration parallel to the Z axis of the crystal. When the crystal is composed of lithium niobate or lithium tantalate, the transducer has high efficiency and when the crystal is composed of lithium niobate it operates effectively over a very wide range of temperatures, including high temperatures above 1,000*F.
Inventors
- 👤 H Epstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:02
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0644; B06B1/0655; G; G01; G01P; G01P15/00; G01P15/02; G01P15/08; G01P15/09; G01P15/0915; H; H10; H10N; H10N30/00; H10N30/30; H10N30/302
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
93 words
In a transducer of the shear type in which an electrical signal is developed across two parallel cylindrical surfaces of an annular piezoelectric element mounted to move relatively to each other in a direction parallel to such surfaces in response to force applied to at least one of said surfaces in said direction and in which means are provided for conducting such electrical signal to a utilization device responsive thereto, the improvement wherein said annular piezoelectric element comprises a piezoelectric crystal of the 3m class having its Z axis parallel to said surfaces.
Claim 2
Dependent Claim
93 words
In a transducer of the shear type in which an electrical signal is developed across two parallel cylindrical surfaces of an annular piezoelectric element mounted to move relatively to each other in a direction parallel to such surfaces in response to force applied to at least one of said surfaces in said direction and in which means are provided for conducting such electrical signal to a utilization device responsive thereto, the improvement wherein said annular piezoelectric element comprises a piezoelectric crystal of the 3m class having its Z axis parallel to said surfaces.
Claim 3
Dependent Claim
101 words
In a transducer of the shear type in which an electrical signal is developed across two parallel cylindrical surfaces of an annular piezoelectric element mounted to move relatively to each other in a direction parallel to such surfaces in response to force applied to at least one of said surfaces in said direction and in which means are provided for conducting such electrical signal to a utilization device responsive thereto, the improvement wherein said annular piezoelectric element comprises a lithium niobate crystal having its Z axis parallel to said surfaces, and means providing communication between said crystal and an oxygen-containing atmosphere.
Claim 4
Dependent Claim
101 words
In a transducer of the shear type in which an electrical signal is developed across two parallel cylindrical surfaces of an annular piezoelectric element mounted to move relatively to each other in a direction parallel to such surfaces in response to force applied to at least one of said surfaces in said direction and in which means are provided for conducting such electrical signal to a utilization device responsive thereto, the improvement wherein said annular piezoelectric element comprises a lithium niobate crystal having its Z axis parallel to said surfaces, and means providing communication between said crystal and an oxygen-containing atmosphere.
Claim 5
Dependent Claim
94 words
In a transducer of the shear type in which an electrical signal is developed across two parallel cylindrical surfaces of an annular piezoelectric element mounted between two members which are adapted to move relatively to each other in a direction parallel to such surfaces in response to said relative motion of said two members and in which means are provided for conducting such electrical signal to a utilization device responsive thereto, the improvement wherein said annular piezoelectric element comprises a piezoelectric crystal of the 3m class havings its Z axis parallel to said surfaces.
Claim 6
Dependent Claim
94 words
In a transducer of the shear type in which an electrical signal is developed across two parallel cylindrical surfaces of an annular piezoelectric element mounted between two members which are adapted to move relatively to each other in a direction parallel to such surfaces in response to said relative motion of said two members and in which means are provided for conducting such electrical signal to a utilization device responsive thereto, the improvement wherein said annular piezoelectric element comprises a piezoelectric crystal of the 3m class havings its Z axis parallel to said surfaces.
Claim 7
Dependent Claim
58 words
A transducer as defined in claim 3 comprising an accelerometer in which one of said two members constitutes an inertial member resiliently supported by said element from the other of said two members and wherein said electrical signal is developed in response to the acceleration of an object that is secured to said other of said two members.
Claim 8
Dependent Claim
36 words
An accelerometer as defined in claim 4 wherein one of said members has a base provided with a base surface attachable to the surface of said accelerating object, said base surface being normal to said Z-axis.
Claim 9
Dependent Claim
33 words
A transducer as defined in claim 3 in which said element has a central hole therein and one of said two members extends through said element, said two members being composed of metal.
Claim 10
Dependent Claim
60 words
A transducer as defined in claim 3 in which said element has a central hole therein, and one of said two members extends through said element, the other member being of annular configuration, and wherein said two members are composed of electrically conductive material, the parallel surfaces of said piezoelectric element being in electrically conductive relation with said respective members.
Claim 11
Dependent Claim
30 words
A crystal body as defined in claim 7 wherein each said coating comprises an inner layer of electrically conductive material and an outer layer of non-corrosive, malleable, electrically conductive material.
Claim 12
Dependent Claim
61 words
A crystal body as defined in claim 8 wherein said inner coating is bonded to and covers the inner parallel cylindrical surface of said crystal and is composed of a thin layer of chromium and said outer coating is secured to and covers the outer surface of said inner electrode, said outer electrode being composeD of a thin layer of gold.
Claim 13
Dependent Claim
89 words
In a transducer of the shear type in which an electrical signal is developed across two parallel cylindrical surfaces of an annular piezoelectric element mounted between two members which are adapted to move relatively to each other in a direction parallel to such surfaces in response to said relative motion of said two members and in which means are provided for conducting such electrical signal to a utilization device responsive thereto, the improvement wherein said annular piezoelectric element comprises lithium niobate having its Z axis parallel to said surfaces.
Claim 14
Dependent Claim
89 words
In a transducer of the shear type in which an electrical signal is developed across two parallel cylindrical surfaces of an annular piezoelectric element mounted between two members which are adapted to move relatively to each other in a direction parallel to such surfaces in response to said relative motion of said two members and in which means are provided for conducting such electrical signal to a utilization device responsive thereto, the improvement wherein said annular piezoelectric element comprises lithium niobate having its Z axis parallel to said surfaces.
Claim 15
Dependent Claim
25 words
A transducer as defined in claim 10 including means to apply a force to at least one of said surfaces in said direction of movement.
Claim 16
Dependent Claim
25 words
A single crystal body comprising an annular crystal of the 3m class having two parallel cylindrical surfaces parallel to the Z axis of said crystal.
Claim 17
Dependent Claim
25 words
A single crystal body comprising an annular crystal of the 3m class having two parallel cylindrical surfaces parallel to the Z axis of said crystal.
Claim 18
Dependent Claim
17 words
A single crystal body as defined in claim 12 wherein said body is composed of lithium niobate.
Claim 19
Dependent Claim
25 words
An article of manufacture comprising a crystal body as defined in claim 12 wherein said cylindrical surfaces have coatings of electrically conductive material on them.
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) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |