Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1997-10-03
2000-05-30
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310328, 310340, 310366, H01L 4108
Patent
active
060694335
ABSTRACT:
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.
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R/flex Circuit Materials Product Data Sheet DS20903J, "Flex-I-MID 3000, High Performance Adhesiveles Circuit Materials", by Rogers Corporation, Microwave and Circuit Materials Division.
Crawley Edward F.
Lazarus Kenneth B.
Lundstrom Mark E.
Moore Jeffrey W.
Active Control Experts, Inc.
Budd Mark O.
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