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US4862029A
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US
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Actuator
Assignee: Tosoh Corp
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Filing: 1988-01-20
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Granted: 1989-08-29
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Expires: 2008-01-20
Abstract
Abstract An actuator of the present invention is composed of a monomorph-type piezoelectric ceramic. The monomorph-type piezoelectric ceramic is a BaTiO 3 -based ceramic, a PZT based ceramic having Nb, Sb, La, Mn, Nd and Bi, BaTiO 3 --SrTiO 3 -based ceramic containing SrTiO 3 by 20 to 35 mole %, K(Nb, Ta)O 3 -based ceramic, or a ceramic represented by a general formula: [Pb, (A 1/2 B 1/2 )](Zr 1-n , Cn)O 3 where A is a monovalent element such as Li, Na, K, Rb, Cs or the like, B is a trivalent element such as Bi, La, Y, Sb, Ga or the like, A and B being both replaceable solid-meltable elements for Pb, C is an element such as Ti, Sn or the like that is a replaceable solid-meltable element for Zr, and n is from 0 to 0.8.
Inventors
- 👤 Kiyoshi Kasai
- 👤 Naomichi Sakai
- 👤 Tomoyuki Oikawa
- 👤 Kenji Uchino
- 👤 Takaaki Tsukidate
- 👤 Hiroshi Asakura
- 👤 Hiroshi Yamamura
- 👤 Hiroya Nagata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:33
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/48; C04B35/486; C04B35/49; C04B35/491; H; H10; H10N; H10N30/00; H10N30/20; H10N30/204; H10N30/2041; H10N30/2042; H10N30/80; H10N30/85; H10N30/853; H10N30/8548; H10N30/8554
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
101 words
An actuator comprising an actuator element capable of bending in response to an applied electric field, said actuator element consisting of an unpolarized monomorph-type PZT-based piezoelectric ceramic which includes at least one additive selected from oxides of Nb, Sb, Ta, La, Mn and Bi in an amount between 0.8 to 2.0 mol% relative to the PZT powder in said PZT-based piezoelectric ceramic, and wherein said PZT-based ceramic exhibits a dielectric loss value of at least 5% at 1 kHz, and a dielectric loss value at 100 kHz which is at least 30% less than the dielectric loss value at 1 kHz.
Claim 2
Dependent Claim
101 words
An actuator comprising an actuator element capable of bending in response to an applied electric field, said actuator element consisting of an unpolarized monomorph-type PZT-based piezoelectric ceramic which includes at least one additive selected from oxides of Nb, Sb, Ta, La, Mn and Bi in an amount between 0.8 to 2.0 mol% relative to the PZT powder in said PZT-based piezoelectric ceramic, and wherein said PZT-based ceramic exhibits a dielectric loss value of at least 5% at 1 kHz, and a dielectric loss value at 100 kHz which is at least 30% less than the dielectric loss value at 1 kHz.
Claim 3
Dependent Claim
15 words
The actuator according to claim 1, wherein said additive is Nb 2 O 5 .
Claim 4
Dependent Claim
15 words
The actuator according to claim 1, wherein said additive is Sb 2 O 3 .
Claim 5
Dependent Claim
15 words
The actuator according to claim 1, wherein said additive is Ta 2 O 5 .
Claim 6
Dependent Claim
58 words
An actuator comprising an actuator element capable of bending in response to an applied electric field, said actuator element consisting of an unpolarized monomorph-type BaTiO 3 -SrTiO 3 -based piezoelectric ceramic including on at least one side thereof a fired Ag layer, wherein said monomorph-type piezoelectric ceramic contains SrTiO 3 in an amount between 20 to 35 mol%.
Claim 7
Dependent Claim
58 words
An actuator comprising an actuator element capable of bending in response to an applied electric field, said actuator element consisting of an unpolarized monomorph-type BaTiO 3 -SrTiO 3 -based piezoelectric ceramic including on at least one side thereof a fired Ag layer, wherein said monomorph-type piezoelectric ceramic contains SrTiO 3 in an amount between 20 to 35 mol%.
Claim 8
Dependent Claim
46 words
An actuator comprising an actuator element capable of bending in response to an applied electric field, said actuator element consisting of an unpolarized monomorph-type K(Nb, Ta)) 3 -based piezoelectric ceramic, wherein said monomorph-type piezoelectric ceramic contains SiO 2 or Al 2 O 3 as an additive.
Claim 9
Dependent Claim
46 words
An actuator comprising an actuator element capable of bending in response to an applied electric field, said actuator element consisting of an unpolarized monomorph-type K(Nb, Ta)) 3 -based piezoelectric ceramic, wherein said monomorph-type piezoelectric ceramic contains SiO 2 or Al 2 O 3 as an additive.
Claim 10
Dependent Claim
21 words
The actuator according to claim 6, wherein the ceramic contains 0.8-1.2 mol % Al 2 O 3 or SiO 2 .
Claim 11
Dependent Claim
114 words
An actuator comprising an actuator element capable of bending in response to an applied electric field, said actuator element consisting of an unpolarized monomorph-type piezoelectric ceramic, wherein said monomorph-type piezoelectric ceramic is a (Pb,(A 1/2 B 1/2 ))(Zr 1-n , C n )O 3 -based ceramic where A is a monovalent element selected from the group consisting of Li, Na, K, Rb, and Cs, B is a trivalent element selected from the group consisting of Bi, La, Y, Sb, and Ga, A and B being both replaceable solid-meltable elements for Pb, C is an element of Ti or Sn that is a replaceable solid-meltable element for Zr, and n is from 0 to 0.8.
Claim 12
Dependent Claim
114 words
An actuator comprising an actuator element capable of bending in response to an applied electric field, said actuator element consisting of an unpolarized monomorph-type piezoelectric ceramic, wherein said monomorph-type piezoelectric ceramic is a (Pb,(A 1/2 B 1/2 ))(Zr 1-n , C n )O 3 -based ceramic where A is a monovalent element selected from the group consisting of Li, Na, K, Rb, and Cs, B is a trivalent element selected from the group consisting of Bi, La, Y, Sb, and Ga, A and B being both replaceable solid-meltable elements for Pb, C is an element of Ti or Sn that is a replaceable solid-meltable element for Zr, and n is from 0 to 0.8.
Claim 13
Dependent Claim
20 words
The actuator according to claim 8, wherein said ceramic contains SiO 2 or Al 2 O 3 as an additive.
Claim 14
Dependent Claim
18 words
An actuator according to claim 1, wherein said PZT-based ceramic has a relative density of 70 to 90%.
Claim 15
Dependent Claim
172 words
An actuator comprising an actuator element capable of bending in response to an applied electric field, said actuator element consisting of a monomorph-type piezoelectric ceramic element, and a fired Ag layer on at least one side of said ceramic element, and wherein said ceramic element consists essentially of an unpolarized BaTiO 3 -based ceramic material that exhibits a dielectric loss value of at least 5% at 1 kHz, and a dielectric loss value at 100 KHz which is at least 30% less than the dielectric loss value at 1 kHz, wherein said ceramic material contains, as an additive, between 0.2 to 20 mol% SiO 2 , between 0.2 to 1.5 mol% Al 2 O 3 , or mixtures thereof, provided that if a mixture of SiO 2 and Al 2 O 3 is present, then said mixture of SiO 2 and Al 2 O 3 is present in an amount between 0.2 to 20 mol%, with a molar ratio of Al 2 O 3 to SiO 2 being no greater than 0.8.
Claim 16
Dependent Claim
172 words
An actuator comprising an actuator element capable of bending in response to an applied electric field, said actuator element consisting of a monomorph-type piezoelectric ceramic element, and a fired Ag layer on at least one side of said ceramic element, and wherein said ceramic element consists essentially of an unpolarized BaTiO 3 -based ceramic material that exhibits a dielectric loss value of at least 5% at 1 kHz, and a dielectric loss value at 100 KHz which is at least 30% less than the dielectric loss value at 1 kHz, wherein said ceramic material contains, as an additive, between 0.2 to 20 mol% SiO 2 , between 0.2 to 1.5 mol% Al 2 O 3 , or mixtures thereof, provided that if a mixture of SiO 2 and Al 2 O 3 is present, then said mixture of SiO 2 and Al 2 O 3 is present in an amount between 0.2 to 20 mol%, with a molar ratio of Al 2 O 3 to SiO 2 being no greater than 0.8.
Claim 17
Dependent Claim
31 words
An actuator according to claim 11, wherein the BaTiO 3 -based ceramic element also contains at least one oxide of a 5A-group element, Ga, Bi, Sb, W, or a rare-earth element.
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) | 1992-08-28 | 1993-02-27 | 1993-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-28 | 1997-02-27 | 1997-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-28 | 2001-02-27 | 2001-08-29 | $7700.00 | Window Closed / Lapsed |