Patent US3774057A successfully refreshed from Google Patents.
US3774057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resonator for torsional vibration
Assignee: NEC Corp
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Filing: 1972-04-17
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Granted: 1973-11-20
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Expires: 1992-04-17
Abstract
Abstract A generally disc-shaped ferroelectric ceramic piece is provided with at least one recess inwardly extending from the peripheral surface and is poled along the azimuthal direction so as to adapt the piece to torsional vibration. A pair of electrodes are attached to the principal surfaces of the piece, respectively. During manufacture, a pair of electrodes for poling the piece are attached to the face of the piece provided by the recess and are removed after poling.
Inventors
- 👤 N Tsubouchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:28
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/15; H03H9/17; H03H9/176
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
105 words
A ceramic resonator comprising a ferro-electric ceramic piece that is generally disc shaped having two parallel principal surfaces, a cylindrical peripheral surface joining said principal surfaces, and a pair of electrodes attached to said principal surfaces, respectively, said piece being poled along paths between and substantially parallel to said principal surfaces so as to adapt said resonator to the torsional mode of vibration with its principal surfaces moving in opposite directions, wherein the improvement comprises at least one recess extending inwardly from the circle defined by said peripheral surface, the face of said piece formed by said recess being substantially perpendicular to said principal surfaces.
Claim 2
Dependent Claim
105 words
A ceramic resonator comprising a ferro-electric ceramic piece that is generally disc shaped having two parallel principal surfaces, a cylindrical peripheral surface joining said principal surfaces, and a pair of electrodes attached to said principal surfaces, respectively, said piece being poled along paths between and substantially parallel to said principal surfaces so as to adapt said resonator to the torsional mode of vibration with its principal surfaces moving in opposite directions, wherein the improvement comprises at least one recess extending inwardly from the circle defined by said peripheral surface, the face of said piece formed by said recess being substantially perpendicular to said principal surfaces.
Claim 3
Dependent Claim
49 words
A resonator as set forth in claim 1, wherein there is only one recess and said face of said piece provided by said recess comprises two face portions, each portion forming a plane, said paths along which said piece is poled being arcuate and concentric with said peripheral surface.
Claim 4
Dependent Claim
29 words
A resonator as set forth in claim 1, wherein the greatest distance between said two face portions is not more than 0.9 times the diameter of said peripheral surface.
Claim 5
Dependent Claim
43 words
A resonator as set forth in claim 2, wherein said two face portions form a pair of substantially parallel planes, the distance between said planes, and the diameter of the piece being in the proportions 1.2, 2.0 and not more than 7.0, respectively.
Claim 6
Dependent Claim
63 words
A resonator as set forth in claim 1, wherein said recesses are three in number and each face of said piece which forms a recess is substantially perpendicular to one of three radii of said disc, said three radii trisecting said disc and said paths along which said piece is poled being cordal with respect to the cylinder defined by said peripheral surface.
Claim 7
Dependent Claim
47 words
A resonator as set forth in claim 5, wherein a further recess extends inwardly from each of said faces of said piece starting in the vicinity of a line which is perpendicular to said principal surfaces and which substantially bisects the area of one of said faces.
Claim 8
Dependent Claim
43 words
A resonator as set forth in claim 1, wherein said recesses are four in number and said faces of said piece formed by the respective recesses are substantially perpendicular to four radii of said disc which are in quadrature relation to one another.
Claim 9
Dependent Claim
48 words
A resonator as set forth in claim 7, wherein a further recess extends inwardly from each of said four faces of said piece starting in the vicinity of a line which is perpendicular to a principal surface and which substantially bisects the area of one of said faces.
Claim 10
Dependent Claim
26 words
The resonator as set forth in claim 2, wherein each face portion forms an angle of 0* to 90* with an intersecting radius of said disc.
Claim 11
Dependent Claim
25 words
The resonator as set forth in claim 1, further comprising a substantially cylindrical bore centrally disposed in said disc, said recess extending into said bore.
Claim 12
Dependent Claim
29 words
A resonator as set forth in claim 10, wherein the diameter of said bore is within a range between 0.2 and 0.9 times the diameter of said peripheral surface.
References Cited (Backward Citations)
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US3074034A
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US3396327A
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US3405289A
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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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |