Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2006-05-09
2006-05-09
Dougherty, Thomas M. (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S328000
Reexamination Certificate
active
07042143
ABSTRACT:
In piezoceramic multilayer actuators, the head region and the foot region consist of inactive, that is to say electrode-free, piezoceramic layers. Due to the arrangement of the metallic electrodes and the layers of the piezoceramic materials, the shrinkage of the piezoceramic material, in particular in the passive head region and foot region, is influenced during the sintering process and can cause the formation of cracks. Different expansion behavior of the active and of the passive region during operation also lead to stresses which favor crack formation, in particular at the boundary between both regions.According to the invention, it is therefore proposed that a transition region (11), whose shrinkage and expansion behavior lies between the shrinkage and expansion behavior of the active region (10) and the shrinkage and expansion behavior of an inactive region (8, 9) which are electrode free, adjoins the active region (10) up to the inactive head region (8) and up to the inactive foot region (9).
REFERENCES:
patent: 5168189 (1992-12-01), Dam et al.
patent: 5218259 (1993-06-01), Dam et al.
patent: 5271133 (1993-12-01), Dam et al.
patent: 5295288 (1994-03-01), Dam et al.
patent: 5892416 (1999-04-01), Unami et al.
patent: 6291929 (2001-09-01), Heinz et al.
patent: 2001/0047796 (2001-12-01), Yamada et al.
patent: 2002/0084872 (2002-07-01), Kawazoe
patent: 2002/0185935 (2002-12-01), Yamamoto et al.
patent: WO 92/06511 (1992-04-01), None
Bindig Reiner
Helke Günter
Schmidt Jürgen
Schreiner Hans-Jürgen
Simmerl Matthias
CeramTec Ag Innovative Ceramic Engineering
Dougherty Thomas M.
Fulbright & Jaworski L.L.P.
LandOfFree
Piezoceramic multilayer actuator with a transition region... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Piezoceramic multilayer actuator with a transition region..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Piezoceramic multilayer actuator with a transition region... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3600612