US3735161A
Expired / Lapsed
US
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Piezoelectric transducer
Assignee: Bell and Howell Co
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Filing: 1971-12-23
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Granted: 1973-05-22
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Expires: 1991-12-23
Abstract
Abstract A lithium niobate piezoelectric single crystal transducer having selected rotational orientations with respect to X, Y and Z rectangular coordinate axes. Compressional mode accelerometers having low or zero shear and torsion sensitivity are provided in which the crystal is oriented, in IRE notation, as (a) a (yxl) +38.6* cut or symmetrical equivalents thereof, such as (zxl) (b) a +60* /+51.4* cut. Shear mode accelerometers having low or zero compression sensitivity are provided in which the crystal is oriented, in IRE notation, as (a) (xyl) +31.7* cut, or symmetrical equivalents, and (b) an (xyl) +76.7* cut.
Inventors
- 👤 G Perkins
- 👤 J Colbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:37
CPC Classifications
G; G01; G01P; G01P15/00; G01P15/02; G01P15/08; G01P15/09; G01P15/0907; G01P15/0915; H; H01; H01G; H01G7/00; H01G7/02; H01G7/025
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
26 words
The improvement according to claim 1 in which said cut crystal, has a (xyl) + 38.6*( + or - 1*) orientation or a symmetrical equivalent thereof.
Claim 2
Dependent Claim
27 words
The improvement according to claim 1 in which said cut crystal, has an (xyl) + 31.7* ( + or - 1*) orientation or a symmetrical equivalent thereof.
Claim 3
Dependent Claim
27 words
The improvement according to claim 1 in which said cut crystal, has an (xyl) + 76.7* ( + or - 1*) orientation or a symmetrical equivalent thereof.
Claim 4
Dependent Claim
30 words
The invention according to claim 1 in which said cut crystal, has a (zxtl) + 60*( + or - 1*)/+ 51.4*( + or - 1*)orientation or a symmetrical equivalent thereof.
Claim 5
Dependent Claim
72 words
In an accelerometer wherein a piezoelectric crystal is operatively associated in a compressional relationship with an inertial member, the improvement according to which said piezoelectric crystal is cut from a larger crystal of lithium niobate, said cut crystal, having a crystal orientation selected from the following: (yzl) + 38.6*( + or - 1*) and (zxtl) + 60*( + or - 1*)/ + 51.4*( + or - 1*), or a symmetrical equivalent thereof.
Claim 6
Dependent Claim
26 words
The improvement according to claim 6 in which said cut crystal, has a (yzl) + 38.6*( + or - 1*) orientation or a symmetrical equivalent thereof.
Claim 7
Dependent Claim
32 words
The improvement according to claim 6 in which said cut crystal, has a (zxtl) + 60*( + or - 1*)/ + 51.4*( + or - 1*) orientation or a symmetrical equivalent thereof.
Claim 8
Dependent Claim
67 words
In a piezoelectric accelerometer wherein a piezoelectric crystal is operatively associated in a shear relationship with an inertial member, the improvement according to which said piezoelectric crystal is cut from a larger crystal of lithium niobate, said cut crystal having a crystal orientation selected from the following: (xyl) + 31.7*( + or - 1*) and (xyl) + 76.7*( + or - 1*) or a symmetrical equivalent thereof.
Claim 9
Dependent Claim
26 words
The improvement according to claim 9 in which said cut crystal, has an (xyl) + 31.7*( + or - 1*) orientation or a symmetrical equivalent thereof.
Claim 10
Dependent Claim
26 words
The improvement according to claim 9 in which said cut crystal, has an (xyl) + 76.7*( + or - 1*) orientation or a symmetrical equivalent thereof.
Claim 11
Dependent Claim
50 words
A single crystal plate of lithium niobate having a crystal orientation selected from the following: (yxl) + 38.6* ( + or -1*), (zxtl) + 60*( + or - 1*)/ + 51.4* ( + or - 1*), (xyl) 31.7*( + or - 1*) and (xyl) + 76.7*( + or - 1*).
Claim 12
Dependent Claim
17 words
The single crystal plate of claim 12 having a (xyl) + 38.6*( + or - 1*) orientation.
Claim 13
Dependent Claim
23 words
The single crystal plate of claim 12 having a (zxtl) + 60*( + or - 1*)/ + 51.4*( + or - 1*) orientation.
Claim 14
Dependent Claim
17 words
The single crystal plate of claim 12 having an (xyl) + 31.7*( + or - 1*) orientation.
Claim 15
Dependent Claim
17 words
The single crystal plate of claim 12 having an (xyl) + 76.7*( + or - 1*) orientation.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |