Patent EP0262637A2 successfully refreshed from Google Patents.
EP0262637A2
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Piezoelectric actuator
Assignee: Mitsubishi Chemical Corp
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Filing: 1987-09-28
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Granted: —
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Expires: 2007-09-28
Abstract
Abstract A piezoelectric actuator comprising a longitudinal effect-type laminated piezoelectric element composed of piezoelectric ceramic sheets laminated in their thickness direction, and a supporting member fixed to one side in the longitudinal direction of the element and being bending and capable of constraining expansion of the element.
Inventors
- 👤 Yukio Mitsubishi Chemical Industries Chida
- 👤 Tetsuhiko C/O Mitsubishi Chem.Ind.Ltd. Nishimura
- 👤 Yasuo C/L Mitsubishi Chemical Ind.Ltd. Oguri
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 19:19
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/20; H10N30/204; H10N30/2041; H10N30/2042
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
46 words
A piezoelectric actuator comprising a longitudinal effect-type laminated piezoelectric element composed of piezoelectric ceramic sheets laminated in their thickness direction, and a supporting member fixed to one side in the longitudinal direction of the element and being bending and capable of constraining expansion of the element.
Claim 2
Dependent Claim
46 words
A piezoelectric actuator comprising a longitudinal effect-type laminated piezoelectric element composed of piezoelectric ceramic sheets laminated in their thickness direction, and a supporting member fixed to one side in the longitudinal direction of the element and being bending and capable of constraining expansion of the element.
Claim 3
Dependent Claim
34 words
The piezoelectric actuator according to Claim 1, wherein the supporting member is a transversal effect-type piezoelectric element contractible in a direction opposite to the direction of expansion of the longitudinal effect-type laminated piezoelectric element.
Claim 4
Dependent Claim
78 words
The piezoelectric actuator according to Claim 1, which is a unimorph-type and wherein the Young's modulus of the supporting member is at least 2.5 times the Young's modulus of the piezoelectric element; the thickness t₂ of the piezoelectric element is within a range of 100 µm ≦ t₂ ≦ 5000 µm; and the ratio of t₂/t₁ where t₂ is the thickness of the piezoelectric element and t₁ is the thickness of the supporting member, is at least 1.6.
Claim 5
Dependent Claim
72 words
The piezoelectric actuator according to Claim 1, wherein the thickness t₂ of the piezoelectric element and the thickness t₁ of the supporting member satisfy the following formulas I and II, repectively: 100 µm ≦ t₂ ≦ 5000 µm (I) t₂ µm ≦ t₁ ≦ 2√Y t₂ µm (II) where Y = Y₂/Y₁ where Y₂ is the Young's modulus of the piezoelectric element and Y₁ is the Young's modulus of the supporting member.
Claim 6
Dependent Claim
45 words
The piezoelectric actuator according to Claim 1, wherein the supporting member is made of a material selected from the group consisting of alumina, zirconia, magnesium aluminate, beryllia, mullite, cordierite, tungsten carbide, titanium carbide, boron carbide, silicon carbide, silicon nitride, aluminum nitride and an iron-nickel alloy.
Claim 7
Dependent Claim
22 words
The piezoelectric actuator according to Claim 1, wherein the piezoelectric element is made of a ceramic composition containing Pb, Zr and Ti.
Claim 8
Dependent Claim
37 words
The piezoelectric actuator according to Claim 1, wherein the suppporting member is fixed to the longitudinal effect-type piezoelectric element with an insulating layer interposed therebetween, when at least the surface of the supporting member is electrically conductive.
References Cited (Backward Citations)
No citation records indexed.
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