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Patent US4023162A successfully refreshed from Google Patents.
US4023162A
Expired / Lapsed
US
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Electronic buzzer
Assignee: Seiko Instruments Inc
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Filing: 1975-09-11
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Granted: 1977-05-10
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Expires: 1995-09-11
Abstract
Abstract An electronic buzzer comprises an acoustic vibrator comprised of a circular metal plate having its entire periphery rigidly secured to a support, and a piezoelectric element adhered to one face of the metal plate. A driving circuit applies electric driving signals to the vibrator to vibrationally drive it at a 1/N multiple of its natural frequency, where N is an integer, so that the vibrator emits an audible buzzing sound. The metal plate is preferably mounted to undergo vibration in a natural vibration mode having only one nodal circle. The drive circuit includes an inductor connected in a closed loop with the vibrator, which functions as a capacitor, and the circuit applies signals at a selectively variable frequency to the closed loop to accordingly vary the inductance of the inductor to thereby vary the period of oscillation of the acoustic vibrator and the resultant frequency of the buzzing sound.
Inventors
- 👤 Fumikazu Murakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:39
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0644; B06B1/0662; B06B1/0677; B06B1/0207; B06B1/0223; G; G10; G10K; G10K9/00; G10K9/12; G10K9/122; H; H04; H04R; H04R17/00; H04R17/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
84 words
An electronic buzzer comprising: an acoustic vibrator comprised of a vibratable metal plate, means fixedly supporting said metal plate around its periphery to undergo vibration relative to its fixed periphery, and a piezoelectric element adhered to one face of said metal plate; and driving means for applying electric driving signals to said acoustic vibrator to vibrationally drive the same at a 1/N multiple of its natural frequency, where N is an integer, to thereby cause said acoustic vibrator to emit an audible buzzing sound.
Claim 2
Dependent Claim
84 words
An electronic buzzer comprising: an acoustic vibrator comprised of a vibratable metal plate, means fixedly supporting said metal plate around its periphery to undergo vibration relative to its fixed periphery, and a piezoelectric element adhered to one face of said metal plate; and driving means for applying electric driving signals to said acoustic vibrator to vibrationally drive the same at a 1/N multiple of its natural frequency, where N is an integer, to thereby cause said acoustic vibrator to emit an audible buzzing sound.
Claim 3
Dependent Claim
23 words
An electronic buzzer according to claim 1; wherein said metal plate has a circular shape and is fixedly supported around its circumferential periphery.
Claim 4
Dependent Claim
39 words
An electronic buzzer according to claim 2; wherein said driving means includes a closed loop circuit comprised of a capacitor and an inductor, and wherein said capacitor includes said acoustic vibrator with said piezoelectric element comprising the capacitor dielectric.
Claim 5
Dependent Claim
49 words
An electronic buzzer according to claim 3; wherein said driving means includes means for applying electric driving signals of selectively variable frequency to accordingly vary the inductance of said inductor to thereby vary the period of oscillation of said acoustic vibrator and the resultant frequency of the buzzing sound.
Claim 6
Dependent Claim
17 words
An electronic buzzer according to claim 4; wherein said inductor comprises a coil having an air core.
Claim 7
Dependent Claim
17 words
An electronic buzzer according to claim 4; wherein said inductor comprises a coil having a magnetic core.
Claim 8
Dependent Claim
97 words
An electronic buzzer comprising: an acoustic vibrator comprised of a vibratable metal plate of circular shape, means fixedly supporting said metal plate around its circumferential periphery to undergo vibration relative to its fixed periphery in a natural vibration mode having one nodal circle, and a piezoelectric element adhered to one face of said metal plate; and driving means for applying electric driving signals to said acoustic vibrator to vibrationally drive the same at a 1/N multiple of its natural frequency, where N is an integer, to thereby cause said acoustic vibrator to emit an audible buzzing sound.
Claim 9
Dependent Claim
97 words
An electronic buzzer comprising: an acoustic vibrator comprised of a vibratable metal plate of circular shape, means fixedly supporting said metal plate around its circumferential periphery to undergo vibration relative to its fixed periphery in a natural vibration mode having one nodal circle, and a piezoelectric element adhered to one face of said metal plate; and driving means for applying electric driving signals to said acoustic vibrator to vibrationally drive the same at a 1/N multiple of its natural frequency, where N is an integer, to thereby cause said acoustic vibrator to emit an audible buzzing sound.
Claim 10
Dependent Claim
39 words
An electronic buzzer according to claim 7; wherein said driving means includes a closed loop circuit comprised of a capacitor and an inductor, and wherein said capacitor includes said acoustic vibrator with said piezoelectric element comprising the capacitor dielectric.
Claim 11
Dependent Claim
49 words
An electronic buzzer according to claim 8; wherein said driving means includes means for applying electric driving signals of selectively variable frequency to accordingly vary the inductance of said inductor to thereby vary the period of oscillation of said acoustic vibrator and the resultant frequency of the buzzing sound.
Claim 12
Dependent Claim
17 words
An electronic buzzer according to claim 9; wherein said inductor comprises a coil having an air core.
Claim 13
Dependent Claim
17 words
An electronic buzzer according to claim 9; wherein said inductor comprises a coil having a magnetic core.
References Cited (Backward Citations)
US3733804A
Cited
US3912952A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |