[특허]Packaged strain actuator

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H01L-041/08
출원번호	US-0943645 (1997-10-03)
발명자 / 주소	Lazarus Kenneth B. Lundstrom Mark E. Moore Jeffrey W. Crawley Edward F.
출원인 / 주소	Active Control eXperts, Inc.
대리인 / 주소	Testa, Hurwitz & Thibeault LLP
인용정보	피인용 횟수 : 47 인용 특허 : 24

초록 ▼

A modular actuator assembly includes one or more plates or elements of electro-active material bonded to an electroded sheet, preferably by a structural polymer to form a card. The card is sealed, and may itself constitute a practical device, such as a vane, shaker, stirrer, lever, pusher or sonicat

A modular actuator assembly includes one or more plates or elements of electro-active material bonded to an electroded sheet, preferably by a structural polymer to form a card. The card is sealed, and may itself constitute a practical device, such as a vane, shaker, stirrer, lever, pusher or sonicator for direct contact with a solid or immersion in a fluid, or may be bonded by a stiff adhesive to make a surface-to-surface mechanical coupling with a solid workpiece,device, substratesmachine or sample. The structural polymer provides a bending stiffness such that the thin plate does not deform to its breaking point, and a mechanical stiffness such that shear forces are efficiently coupled from the plate to the workpiece. In further embodiments, the card may include active circuit elements for switching, powering or processing signals, and/or passive circuit elements for filtering, matching or damping signals, so that few or no connections to outside circuitry are required. The actuator assembly can be manufactured in quantity, to provide a versatile actuator with uniform mechanical and actuation characteristics, that introduces negligible mass loading to the workpiece. The cards themselves may be arranged as independent mechanical actuators, rather than strain-transfer actuators, in which the induced strain changes the position of the card. Various arrangements of pinned or cantilevered cards may act as a pusher, bender or other motive actuator, and structures such as powered bellows may be formed directly by folding one or more suitably patterned cards.

대표청구항 ▼

[ What is claimed is:] [1.] An electro-active device comprising a plurality of layers laminated about at least one electro-active ceramic layer to form an electro-active ceramic package, and includinga first and a second electro-active ceramic layer, at least one of said first and second electro-act

[ What is claimed is:] [1.] An electro-active device comprising a plurality of layers laminated about at least one electro-active ceramic layer to form an electro-active ceramic package, and includinga first and a second electro-active ceramic layer, at least one of said first and second electro-active ceramic layers extending over a region and having a first surface and a second surface opposite to said first surface region;a flexible circuit covering a substantial portion of said first surface of said electro-active ceramic layer, the flexible circuit including a non-conductive polymer film layer having opposing first and second surfaces and a conductive lead layer, said first surface of said polymer film layer being attached to said conductive lead layer; anda bonding layer attaching said electro-active ceramic layer to said flexible circuit,wherein said first and second electro-active ceramic layers are oriented to produce torsional actuationwherein said lead layer includes a pattern of lead segments forming a conductive line extending in a path across said film layer and protruding therefrom;wherein said flexible circuit is configured such thati) said conductive line extends substantially entirely across and is attached to said first surface of the electro-active ceramic layer for energizing said entire first surface while bridging cracks; andii) said polymer film layer covers said electro-active ceramic layer and said conductive line, andwherein said bonding layer attaches said electro-active ceramic layer to said flexible circuit such that in-plane strain of the electro-active ceramic layer is shear-coupled from substantially said entire first surface of the electro-active ceramic layer through the flexible circuitso that said in-plane strain is effectively transferred to said second surface of the polymer film layer for utilization of strain produced by the electro-active ceramic layer.

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