Patent US4647808A successfully refreshed from Google Patents.
US4647808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric actuator
Assignee: Juki Corp
•
Filing: 1985-08-29
•
Granted: 1987-03-03
•
Expires: 2005-08-29
Abstract
Abstract An actuator comprises a piezoelectric element and a mechanical amplifier. Displacement caused by the piezoelectric effect of the piezoelectric element is amplified mechanically by a lever-link system having a lever portion and a fulcrum. The lever-link system comprises multiple steps. The amplified displacement is effectively provided by a transmitting arm for use in a electronic equipment such as printers.
Inventors
- 👤 Tsuyoshi Shibuya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:34
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/20; H02; H02N; H02N2/00; H02N2/02; H02N2/04; H02N2/043
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
132 words
An actuator, comprising a frame; displacement transmitting means; a mechanical amplifier attached to said displacement transmitting means and including a lever portion; a piezoelectric element fixed on one end to said frame and on the other end to said mechanical amplifier; a fulcrum shaft including a shaft portion and a fulcrum portion, said shaft portion being eccentric from the center of said fulcrum portion and said fulcrum portion contacting said mechanical amplifier; and a pair of shaft fixing plates fixed to said frame and sandwiching said fulcrum shaft therebetween and allowing said fulcrum shaft to eccentrically rotate therein; wherein said mechanical amplifier amplifies the displacement of said piezoelectric element and the length of said lever portion measured from said fulcrum shaft at least partially defines the amplifying power of said mechanical amplifier.
Claim 2
Dependent Claim
132 words
An actuator, comprising a frame; displacement transmitting means; a mechanical amplifier attached to said displacement transmitting means and including a lever portion; a piezoelectric element fixed on one end to said frame and on the other end to said mechanical amplifier; a fulcrum shaft including a shaft portion and a fulcrum portion, said shaft portion being eccentric from the center of said fulcrum portion and said fulcrum portion contacting said mechanical amplifier; and a pair of shaft fixing plates fixed to said frame and sandwiching said fulcrum shaft therebetween and allowing said fulcrum shaft to eccentrically rotate therein; wherein said mechanical amplifier amplifies the displacement of said piezoelectric element and the length of said lever portion measured from said fulcrum shaft at least partially defines the amplifying power of said mechanical amplifier.
Claim 3
Dependent Claim
22 words
An actuator as recited in claim 1, wherein said frame and said mechanical amplifier are arranged so as to form one unit.
Claim 4
Dependent Claim
25 words
An actuator as recited in claim 1, wherein said piezoelectric element and said mechanical amplifier are situated on a flat surface portion of said frame.
References Cited (Backward Citations)
US3614486A
Cited
US4435666A
Cited
US4506154A
Cited
US4547086A
Cited
US4518887A
Cited
US4570095A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |