Patent US583821A successfully refreshed from Google Patents.
US3622933A
Expired / Lapsed
US
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Electromechanical vibrating reed device
Assignee: Transidyne General Corp
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Filing: 1968-08-30
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Granted: 1971-11-23
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Expires: 1988-08-30
Abstract
Abstract An electromechanical vibrating reed device having a vibrating reed member with an end thereof clamped in a base member. The reed member is provided with a transducer consisting of a substantially thin film of a piezoresistive material having a resistivity varying as a function of the mechanical stress imposed thereon disposed at a portion of the reed member subjected to maximum bending during oscillation or vibration of the reed member. A DC current flowing across the piezoresistive thin film is modulated in amplitude as a function of the amplitude of vibration of the reed member at a frequency corresponding to the natural resonant frequency of vibration of the reed member, and such modulated signal may be utilized to drive the reed member such as to sustain oscillation of the reed member.
Inventors
- 👤 Jan A Van Den Broek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:27
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/24
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
104 words
A frequency sensitive electromechanical vibrating device comprising a base member, an elongated mechanically resonate reed member having a first end free to vibrate and a second end secured to said base member, a piezoresistive transducer defined by a substantially thin film of piezoresistive material on the surface of said reed member at a portion thereof caused to flex when said reed member vibrates, said thin film being provided with current conductive electrodes for connection to an electrical circuit, and an inductance coil electrically connected in series with a source of DC current and said electrodes and being operative to electromagnetically drive said reed member.
Claim 2
Dependent Claim
104 words
A frequency sensitive electromechanical vibrating device comprising a base member, an elongated mechanically resonate reed member having a first end free to vibrate and a second end secured to said base member, a piezoresistive transducer defined by a substantially thin film of piezoresistive material on the surface of said reed member at a portion thereof caused to flex when said reed member vibrates, said thin film being provided with current conductive electrodes for connection to an electrical circuit, and an inductance coil electrically connected in series with a source of DC current and said electrodes and being operative to electromagnetically drive said reed member.
Claim 3
Dependent Claim
228 words
A frequency sensitive electromechanical vibrating device, comprising a base member, an elongated mechanical resonant reed member having a first end free to vibrate and the second end secured to said base member, a piezoresistive transducer defined first by a substantially thin film of piezoresistive on a first sUrface of said reed member at a portion thereof caused to flex when said reed member vibrates, said first thin film being provided with current conductive electrodes for connection to an electrical circuit, a second piezoresistive transducer defined by a substantially thin film of piezoresistive material symmetrically disposed on the second face of said reed member at said portion thereof, said second thin film being provided with current conductive electrodes for connection to an electrical circuit, an inductance coil for electromagnetically driving said reed member, a pair of resistors, a source of DC current, and circuit means interconnecting said first and second thin films in a bridge with said pair of resistors and connecting said inductance coil across one diagonal of said bridge and connecting said source of DC current across the other diagonal bridge, said source of DC current being connected across the common terminal of an electrode of one of said thin films and of one of said resistors and a common terminal of an electrode of the other of said thin films and the other of said resistors.
Claim 4
Dependent Claim
228 words
A frequency sensitive electromechanical vibrating device, comprising a base member, an elongated mechanical resonant reed member having a first end free to vibrate and the second end secured to said base member, a piezoresistive transducer defined first by a substantially thin film of piezoresistive on a first sUrface of said reed member at a portion thereof caused to flex when said reed member vibrates, said first thin film being provided with current conductive electrodes for connection to an electrical circuit, a second piezoresistive transducer defined by a substantially thin film of piezoresistive material symmetrically disposed on the second face of said reed member at said portion thereof, said second thin film being provided with current conductive electrodes for connection to an electrical circuit, an inductance coil for electromagnetically driving said reed member, a pair of resistors, a source of DC current, and circuit means interconnecting said first and second thin films in a bridge with said pair of resistors and connecting said inductance coil across one diagonal of said bridge and connecting said source of DC current across the other diagonal bridge, said source of DC current being connected across the common terminal of an electrode of one of said thin films and of one of said resistors and a common terminal of an electrode of the other of said thin films and the other of said resistors.
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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |