EP0252248A2
Expired / Lapsed
EP
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Actuator
Assignee: Tosoh Corp
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Filing: 1987-05-13
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Granted: —
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Expires: 2007-05-13
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 that has a dielectric loss of at least 5% at 1kHz and whose dielectric loss at 100kHz drops by at least 30% of the value at 1 kHz that in a single layer deflects without preliminary poling.
Inventors
- 👤 Kiyoshi Kasai
- 👤 Naomichi Sakai
- 👤 Tomoyuki Oikawa
- 👤 Kenji Uchino
- 👤 Takaaki Tsukidate
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 07:36
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682; H; H10; H10N; H10N30/00; H10N30/20; H10N30/204; H10N30/2041; H10N30/2042; H10N30/80; H10N30/85; H10N30/853; H10N30/8536
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
8 words
An actuator composed of a monomorph-type piezoelectric ceramic.
Claim 2
Dependent Claim
8 words
An actuator composed of a monomorph-type piezoelectric ceramic.
Claim 3
Dependent Claim
47 words
The actuator according to claim 1 wherein said monomorph-type piezoelectric ceramic is a BaTi0 3 -based ceramic that has a dielectric loss of at least 5% at 1 kHz and whose dielectric loss at 100 kHz drops by at least 30% of the value at 1 kHz.
Claim 4
Dependent Claim
20 words
The actuator according to claim 2 wherein the BaTiO -based ceramic contains Si02' A1203 or their mixture as an additive.
Claim 5
Dependent Claim
21 words
The actuator according to claim 3 wherein the BaTiO 3 -based ceramic contains 0.2 to 20 mol% of SiO 2 .
Claim 6
Dependent Claim
23 words
The actuator according to claim 3 wherein the BaTiO 3 -based ceramic contains 0.2 to 1.5 mol% A 1 2 0 3 .
Claim 7
Dependent Claim
48 words
The actuator according to claim 3 wherein the BaTiO 3 -based ceramic contains both SiO 2 and Al 2 O 3 in a total amount of 0.2 to 2 0 mol% in a molar ratio of Al 2 O 3 to SiO 1 and no higher than 0.8.
Claim 8
Dependent Claim
30 words
The actuator according to claim 3 wherein the BaTiO 3 -based ceramic also contains at least one oxide of a 5A-group element, Ga, Bi, Sb, W or a rare-earth element.
Claim 9
Dependent Claim
22 words
The actuator according to claim 2 wherein the monomorph-type piezoelectric ceramic is a semiconductive BaTiO 3 -based ceramic with an oxidized surface.
Claim 10
Dependent Claim
29 words
The actuator according to claim 8 wherein the semiconducting BaTi0 3 -based ceramic has a specific resistivity, prior to oxidizing, in the range of 10 to 10 5 Ω·cm.
Claim 11
Dependent Claim
20 words
The actuator according to claim 8 wherein the semiconductive BaTiO 3 -based ceramic is composed entirely of BaTiO 3 .
Claim 12
Dependent Claim
36 words
The actuator according to claim 8 wherein the semiconductive BaTiO 3 -based ceramic contains from 0.33 to 2 mol% of at least one oxide of a 5A-group element, Ga, Bi, Sb, W or a rare-earth element.
References Cited (Backward Citations)
No citation records indexed.
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