[특허]Method for producing a composite structure including a piezoelectric element

[미국특허] Method for producing a composite structure including a piezoelectric element 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B32B-031/16
출원번호	US-0120588 (1998-07-22)
우선권정보	DE9732513 (1997-07-29)
발명자 / 주소	Bansemir Horst,DEX Emmerling Stefan,DEX
출원인 / 주소	Eurocopter Deutschland GmbH, DEX
대리인 / 주소	Fasse
인용정보	피인용 횟수 : 17 인용 특허 : 6

초록 ▼

A composite structure (3) includes a piezoelectric element (1) sandwiched between fiber composite panels (2). The composite structure can be used as an actuator element. In a method for producing the composite structure, the fiber composite panels are pre-stressed and pre-strained by applying respective pre-stressing forces (F.sub.1, F.sub.2) in opposite directions along two substantially perpendicular axes in the plane of the panel. The pre-stressed and pre-strained condition of the fiber composite panels (2) is maintained, while the panels are adhesively bonded (5) surfacially onto the piezoelectric element (1). After the bonding is completed, the pre-stressing forces are removed from the fiber composite panels. As a result, in the finished composite structure (3), the fiber composite panels (2) are under internal tension, while the piezoelectric element (1) is under internal compression. The pre-stressing forces (F.sub.1, F.sub.2) are particularly selected in magnitude and direction to achieve the required resultant balance of tension and compression within the composite structure (3). The pre-compression of the piezoelectric element (1) should be sufficient so that operating loads on the composite structure do not result in tension loading of the piezoceramic element, while substantially maintaining the useful active strain range of the overall composite structure.

대표청구항 ▼

[ What is claimed is:] [1.] A method of producing a composite structure including a plate-shaped piezoelectric element sandwiched and adhesively bonded between two fiber composite panels, said method comprising the following steps:a) applying at least one tensile pre-stressing force to each of said fiber composite panels respectively in a plane of each of said fiber composite panels so as to elongate each of said fiber composite panels in said plane, wherein said at least one pre-stressing force is applied to and is effective along a force direction lying in said plane;b) while continuing and maintaining said applying of said at least one pre-stressing force, adhesively bonding said fiber composite panels respectively onto opposite surfaces of said piezoelectric element; andc) after said adhesive bonding has securely bonded said fiber composite panels onto said piezoelectric element, discontinuing said applying of said at least one pre-stressing force, so that said fiber composite panels respectively relax in a direction opposite said force direction in said plane and thereby an internal stress is induced in said piezoelectric element.

이 특허에 인용된 특허 (6) 인용/피인용 타임라인 분석

Crawley Edward F. (Arlington MA) de Luis Javier (Boston MA), Embedded piezoelectric structure and control.
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Dvorsky George R. (Manhattan Beach CA) Love David W. (Lakewood CA), Method for encapsulating a ceramic device for embedding in composite structures.
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Rose David H. (Dayton OH), Method of making a prestressed composite materials.
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Clark Stephen E., Method of manufacturing flextensional transducer using pre-curved piezoelectric ceramic layer.
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Brennan Brian W. (Burlington VT), System for monitoring and controlling physical movement.
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Hellbaum Richard F. (Hampton VA) Bryant Robert G. (Poquoson VA) Fox Robert L. (Hayes VA), Thin layer composite unimorph ferroelectric driver and sensor.
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이 특허를 인용한 특허 (17) 인용/피인용 타임라인 분석

Chaudhry, Zaffir; Wake, Brian E.; Sun, Fanping; Bedwell, Richard Jeremy; Yeh, Jimmy Lin-Min; Hoffman, Lee A., Brushless direct current (BLDC) motor based linear or rotary actuator for helicopter rotor control.
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Blackmon, James Bertram; Dean, David Lee, Composite backed prestressed mirror for solar facet.
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Blackmon,James B; Dean,David L, Composite backed prestressed mirror for solar facet.
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Hirata, Atsuhiko; Omori, Kenta, Fluid control apparatus and method for adjusting fluid control apparatus.
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Tanner,Edward T., Human powered piezoelectric power generating device.
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Tanner,Edward T.; Ott,William F., Method and apparatus for scavenging energy during pump operation.
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East,W. Joe, Method of manufacturing a piezoelectric actuator.
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Tanielian, Minas H., Method to generate electrical current using a plurality of masses attached to piezoceramic supports.
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East,W. Joe, Piezoelectric actuator and pump using same.
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Vogeley, James; Schemman, Marcel F. C.; Jones, Garth S., Piezoelectric devices and methods and circuits for driving same.
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Vogeley,James, Piezoelectric devices and methods and circuits for driving same.
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Vogeley,James, Piezoelectric devices and methods and circuits for driving same.
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Vogeley,James; Schemmann,Marcel F. C.; Jones,Sanford, Piezoelectric devices and methods and circuits for driving same.
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Vogeley,Jim; Blount,Jim; Jones,Sanford, Piezoelectric devices and methods and circuits for driving same.
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Clingman,Dan J.; Jacot,A. Dean, Single crystal piezo (SCP) apparatus and method of forming same.
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Vogeley,James, Stacked piezoelectric diaphragm members.
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Hirata, Atsuhiko; Kamitani, Gaku, Vibrating device and piezoelectric pump.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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[미국특허] Method for producing a composite structure including a piezoelectric element 원문보기