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Patent US5136199A successfully refreshed from Google Patents.
US5136199A
Expired / Lapsed
US
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Device for driving piezoelectric vibrator
Assignee: Aisin Corp
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Filing: 1990-11-16
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Granted: 1992-08-04
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Expires: 2010-11-16
Abstract
Abstract A device for driving a piezoelectric vibrator is comprised of an AC power supply for supplying electric power to a piezoelectric vibrator for vibration thereof, a detecting device for detecting current supplied to the piezoelectric vibrator, and a driving circuit interposed between the AC power supply and the piezoelectric vibrator so as to decrease the electric power being supplied to the piezoelectric vibrator as the current flowing therethrough increases. This structure brings a decrease in electric power being supplied to the piezoelectric vibrator when current flowing therethrough is increased during resonance of the piezoelectric vibrator, thereby enabling the restriction or regulation of the expansion and contraction of the piezoelectric vibrator while maintaining resonance thereof.
Inventors
- 👤 Taneichi Kawai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:14
CPC Classifications
B; B60; B60R; B60R1/00; B60R1/02; B60R1/06; B60R1/0602; B06; B06B; B06B1/00; B06B1/02; B06B1/0207; B06B1/0223; B06B1/0238; B06B1/0246; B06B1/0253; B06B2201/00; B06B2201/50; B06B2201/55; B06B2201/70
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
156 words
A device for driving a piezoelectric vibrator comprising: transformer means connected to said piezoelectric vibrator; power supply means for supplying electric power to the piezoelectric vibrator for vibration thereof; and driving circuit means interposed and connected between said power supply means and said transformer means to control current supplied to said piezoelectric vibrator; said driving circuit means including first and second transistors connected to said power supply means and said transformer means for controlling current to said transformer means, first and second circuit means connected to said first and second transistors, respectively to control the discharge of said transistors in said driving circuit, and detecting means comprising a resistor connected in said driving circuit means for detecting current supplied to the piezoelectric vibrator; whereby said driving circuit means control the magnitude of current supplied to said transformer means and therefore current supplied to said piezoelectric vibrator in accordance with the voltage detected by said detecting means.
Claim 2
Independent Claim
156 words
A device for driving a piezoelectric vibrator comprising: transformer means connected to said piezoelectric vibrator; power supply means for supplying electric power to the piezoelectric vibrator for vibration thereof; and driving circuit means interposed and connected between said power supply means and said transformer means to control current supplied to said piezoelectric vibrator; said driving circuit means including first and second transistors connected to said power supply means and said transformer means for controlling current to said transformer means, first and second circuit means connected to said first and second transistors, respectively to control the discharge of said transistors in said driving circuit, and detecting means comprising a resistor connected in said driving circuit means for detecting current supplied to the piezoelectric vibrator; whereby said driving circuit means control the magnitude of current supplied to said transformer means and therefore current supplied to said piezoelectric vibrator in accordance with the voltage detected by said detecting means.
Claim 3
Dependent Claim
18 words
A device as set forth in claim 1, wherein said piezoelectric vibrator is adhered to a plate member.
Claim 4
Dependent Claim
15 words
A device as set forth in claim 2, wherein said plate member is a mirror.
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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) | 1995-08-04 | 1996-02-03 | 1996-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-04 | 2000-02-03 | 2000-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-04 | 2004-02-03 | 2004-08-04 | $7700.00 | Window Closed / Lapsed |