US4644213A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric actuator
Assignee: TOKYO JUKI INDUSTRIEAL Co Ltd
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Filing: 1986-01-28
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Granted: 1987-02-17
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Expires: 2006-01-28
Abstract
Abstract A mechanical amplifier for a piezoelectric actuator employs a lever-link system having a lever and a fulcrum to amplify a displacement caused by the piezoelectric effect of the piezoelectric element. A fulcrum supporting a last amplified lever forms a semi-pivotal construction to strengthen the stiffness of the amplifier. The invention converts electrical energy into mechanical energy for application to a printer or other electronic instruments.
Inventors
- 👤 Tsuyoshi Shibuya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:32
CPC Classifications
H; H02; H02N; H02N2/00; H02N2/02; H02N2/04; H02N2/043
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
94 words
A piezoelectric actuator comprising: a piezoelectric element having one end fixed to a frame; a mechanical amplifying portion connected to the other end of said piezoelectric element; and a displacement transmitting arm connected in series to a tip portion of said mechanical amplifying portion, said mechanical amplifying portion comprising a lever portion and a plurality of fulcrum portions; wherein the last amplifying fulcrum of said mechanical amplifying portion is coupled to a fulcrum fixing means for strengthening said last amplifying fulcrum and is rotatably inserted into a major segmental groove of said fulcrum means.
Claim 2
Dependent Claim
94 words
A piezoelectric actuator comprising: a piezoelectric element having one end fixed to a frame; a mechanical amplifying portion connected to the other end of said piezoelectric element; and a displacement transmitting arm connected in series to a tip portion of said mechanical amplifying portion, said mechanical amplifying portion comprising a lever portion and a plurality of fulcrum portions; wherein the last amplifying fulcrum of said mechanical amplifying portion is coupled to a fulcrum fixing means for strengthening said last amplifying fulcrum and is rotatably inserted into a major segmental groove of said fulcrum means.
Claim 3
Dependent Claim
18 words
A piezoelectric actuator, as recited in claim 1, wherein said fulcrum fixing means is fixed to said frame.
Claim 4
Dependent Claim
34 words
A piezoelectric actuator, as recited in claim 1, wherein said last amplifying fulcrum of said amplifying portion comprises a semi-pivotal fulcrum including a fulcrum portion and a fulcrum fixing portion fixed to said frame.
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) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |