US4037121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectrically driven tuning fork with harmonic suppression
Assignee: Murata Manufacturing Co Ltd
•
Filing: 1976-03-26
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Granted: 1977-07-19
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Expires: 1996-03-26
Abstract
Abstract An electrically driven tuning fork of the piezoelectric type, electromagnetic type or the like for use in electrical and electronic equipment which includes a tuning fork vibrator and electrical elements for driving the tuning fork vibrator. The two-pronged tuning fork vibrator has a pair of rectangular projections integrally formed with the prongs on corresponding side edges of the said prongs at one side of the tuning fork, excepting opposite end portions of the prongs adjacent to the node and in same embodiments, both the mode and antinode of the fundamental harmonic oscillation of the tuning fork for suppressing undesirable oscillation other than the fundamental harmonic oscillation of the tuning fork. Electrical elements are affixed onto the outer or inner surfaces of the prongs.
Inventors
- 👤 Takeshi Nakamura
- 👤 Hiroshi Nishiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:52
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/24
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
93 words
An electrically driven tuning fork for use in electrical and electronic equipment which comprises a tuning fork vibrator having two prongs and electrical elements applied to said prongs for driving said tuning fork vibrator, said prongs having inner and outer surfaces defined between side edges thereof; said tuning fork vibrator including projections formed on said prongs and extending over substantially the length of said prongs, except over node portions of fundamental harmonic oscillation thereof, said projections acting to stiffen said prongs so as to suppress higher harmonic oscillation in said tuning fork vibrator.
Claim 2
Dependent Claim
93 words
An electrically driven tuning fork for use in electrical and electronic equipment which comprises a tuning fork vibrator having two prongs and electrical elements applied to said prongs for driving said tuning fork vibrator, said prongs having inner and outer surfaces defined between side edges thereof; said tuning fork vibrator including projections formed on said prongs and extending over substantially the length of said prongs, except over node portions of fundamental harmonic oscillation thereof, said projections acting to stiffen said prongs so as to suppress higher harmonic oscillation in said tuning fork vibrator.
Claim 3
Dependent Claim
33 words
An electrically driven tuning fork as claimed in claim 1, wherein said tuning fork vibrator further includes notches formed in said side edges of said prongs in positions adjacent to said node portions.
Claim 4
Dependent Claim
34 words
An electrically driven tuning fork as claimed in claim 1, wherein said tuning fork vibrator further includes substantially transverse grooves formed in said surfaces of said prongs in positions adjacent to said node portions.
Claim 5
Dependent Claim
56 words
An electrically driven tuning fork as claimed in claim 1, wherein said prongs are integrally formed, except the node and antinode portions of the fundamental harmonic oscillation thereof, with said projections which extend forwardly in spaced and parallel relation to each other from said side edges of said prongs, at one side of said tuning fork.
Claim 6
Dependent Claim
68 words
An electrically driven tuning fork as claimed in claim 1, wherein said prongs are integrally formed, except the node and antinode portions of the fundamental harmonic oscillation thereof, with said projections which extend inwardly towards each other at right angles from said side edges of said prongs so as to face each other at corresponding edges thereof through a space therebetween, at one side of said tuning fork.
Claim 7
Dependent Claim
55 words
An electrically driven tuning fork as claimed in claim 1, wherein said prongs are integrally formed, except the node and antinode portions of the fundamental harmonic oscillation thereof, with said projections which extend outwardly away from said each other at right angles from side edges of said prongs, at both sides of said tuning fork.
Claim 8
Dependent Claim
52 words
An electrically driven tuning fork as claimed in claim 1, wherein said prongs are integrally formed, except the node portions of the fundamental harmonic oscillation thereof, with said projections which extend outwardly away from each other at right angles from said edges of said prongs, at one side of said tuning fork.
Claim 9
Dependent Claim
50 words
An electrically driven tuning fork as claimed in claim 7, wherein said prongs are further provided with notches formed therein in said side edges at positions adjacent to said node portions and immediately below said projections, at the said one side of said tuning fork whereat said projections are formed.
Claim 10
Dependent Claim
50 words
An electrically driven tuning fork as claimed in claim 7, wherein said prongs are further provided with notches formed therein in said side edges at positions adjacent to said node portions, at the other side of said tuning fork opposite to the said one side whereat the projections are formed.
Claim 11
Dependent Claim
38 words
An electrically driven tuning fork as claimed in claim 7, wherein said prongs are further provided with notches formed therein in said side edges at positions adjacent to said node portions, at both sides of said tuning fork.
Claim 12
Dependent Claim
41 words
An electrically driven tuning fork as claimed in claim 7, wherein said prongs are further provided with grooves extending across the width of said prongs and formed on said outer surfaces of said prongs in positions adjacent to said node portions.
Claim 13
Dependent Claim
41 words
An electrically driven tuning fork as claimed in claim 7, wherein said prongs are further provided with grooves extending across the width of said prongs and formed on said inner surfaces of said prongs in positions adjacent to said node portions.
Claim 14
Dependent Claim
48 words
An electrically driven tuning fork as claimed in claim 11, wherein said prongs are further provided with other grooves extending across the width of said prongs and formed in the outer surfaces of said prongs parallel to said first mentioned grooves in positions adjacent to said node portions.
Claim 15
Dependent Claim
66 words
An electrically driven tuning fork as claimed in claim 1, wherein said prongs are integrally formed, except the node portions of the fundamental harmonic oscillation thereof, with said projections which extend inwardly towards each other at right angles from said side edges of said prongs so as to face each other at corresponding edges thereof through a space therebetween, at one side of said tuning fork.
Claim 16
Dependent Claim
53 words
An electrically driven tuning fork as claimed in claim 1, wherein said prongs are integrally formed, except the node portions of the fundamental harmonic oscillation thereof, with said projections which extend outwardly away from each other at right angles from said side edges of said prongs, at both sides of said tuning fork.
Claim 17
Dependent Claim
47 words
An electrically driven tuning fork as claimed in claim 1, wherein said prongs are integrally formed, except the node portions of the fundamental harmonic oscillation thereof, with said projections which are provided on said outer surfaces of said prongs to form stepped portions of increased thickness thereat.
Claim 18
Dependent Claim
47 words
An electrically driven tuning fork as claimed in claim 1, wherein said prongs are integrally formed, except the node portions of the fundamental harmonic oscillation thereof, with said projections which are provided on said inner surfaces of said prongs to form stepped portions of increased thickness thereat.
Claim 19
Dependent Claim
38 words
An electrically driven tuning fork as claimed in claim 1, wherein said prongs are provided, except the node portions of the fundamental harmonic oscillation thereof, with separate plate members attached to said prongs to form said projections thereat.
Claim 20
Dependent Claim
36 words
An electrically driven tuning fork as claimed in claim 18, wherein said separate plate members are affixed, at the longitudinal axes thereof, to corresponding side edges of said prongs, at one side of the tuning fork.
Claim 21
Dependent Claim
108 words
An electrically driven tuning fork as claimed in claim 18, wherein said separate plate members is affixed, at its surface adjacent to a longitudinal side edge thereof, to one of said side edges of said prongs so as to extend inwardly at right angles from one of said prongs, at one side of said tuning fork, with the other of said separate plate members being affixed, at its surface adjacent to a longitudinal side edge thereof, to another of said side edges of said prongs so as to extend outwardly at right angles from the said other of said prongs, at the other side of said tuning fork.
Claim 22
Dependent Claim
32 words
An electrically driven tuning fork as claimed in claim 18, wherein said separate plate members are affixed to said outer surfaces of said prongs to form said projections of increased thickness thereat.
Claim 23
Dependent Claim
32 words
An electrically driven tuning fork as claimed in claim 18, wherein said separate plate members are affixed to said inner surfaces of said prongs to form said projections of increased thickness thereat.
Claim 24
Dependent Claim
19 words
An electrically driven tuning fork as claimed in claim 18, wherein said separate plate members are of metallic material.
Claim 25
Dependent Claim
19 words
An electrically driven tuning fork as claimed in claim 18, wherein said separate plate members are of resinous material.
Claim 26
Dependent Claim
106 words
An electrically driven tuning fork as claimed in claim 18, wherein said separate plate members are each bent at a portion adjacent to one side edge thereof to hold a corresponding said side edge of each of said prongs at one side of said tuning fork for permitting sliding movement of said plate members along and in direction parallel to the side edge of said prongs, and wherein, portions adjacent to the other side edges of said plate members being bent outwardly away from each other to form projections extending from said other side edges of said prongs at the other side of said tuning fork.
References Cited (Backward Citations)
US309138A
Cited
US1637442A
Cited
US2581963A
Cited
US3308361A
Cited
US3593516A
Cited
US3480809A
Cited
US3597642A
Cited
US3759133A
Cited
US3760482A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-18 | 1981-01-17 | 1981-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-18 | 1985-01-17 | 1985-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-18 | 1989-01-17 | 1989-07-19 | $7700.00 | Window Closed / Lapsed |