Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1996-06-12
1997-04-08
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310316, H02N 200
Patent
active
056190891
ABSTRACT:
An ultrasonic motor comprises a piezo-electric element and electrode patterns disposed on a surface of the piezo-electric element at nearly equal intervals in a multiple of four. A vibrating member is disposed on another surface of and electrically connected to the piezo-electric element. A moving member is movably disposed on the vibrating member. First projections which frictionally drive the moving member by expansion and contraction movement of the piezo-electric element are disposed on a surface of the vibrating member near every other one of the boundaries of the electrode patterns of the piezo-electric element. Second projections are provided at each intermediate position between the first projections near all of the boundaries of the electrode patterns other than the boundaries near which the first projections are provided for adjusting the vibrating conditions of the vibrating member. The second projections have a different height from the first projection and do not frictionally drive the moving member. A pressure-regulating member urges the moving member into pressure contact with the vibrating member at a predetermined pressure.
REFERENCES:
patent: 5079470 (1992-01-01), Kasuga et al.
patent: 5300850 (1994-04-01), Okumura et al.
patent: 5402030 (1995-03-01), Mukohjima
patent: 5408156 (1995-04-01), Kawasaki et al.
Iino Akihiro
Kasuga Masao
Suzuki Kenji
Suzuki Makoto
Suzuki Minako
Dougherty Thomas M.
Seiko Instruments Inc.
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