Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1990-02-27
1991-08-13
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310328, H01L 4108
Patent
active
050398997
ABSTRACT:
This invention relates to a piezoelectric transducer comprising an elastic member resonating with substantially the same frequency in a first and a second directions intersecting therewith, a first exciter exciting the vibration of substantially the same frequency in both directions of the elastic member, and a second exciter exciting the vibration of the above frequency in the first direction of the elastic member and exciting the vibration of substantially the same frequency and of the negative phase in the second direction.
Also, the other transducer comprising an electromechanical conversion element which generates ultrasonic vibration by applying AC electric signal, an elastic member where at least 2-way substantially orthogonal vibration is excited by the vibration of the electromechanical conversion element and a holding member made of or constructed as to have a different directional elastic characteristic at a node of either one at least directional vibration which the rigidity of the intersecting direction is set smaller than the rigidity of the vibrational direction having the node.
REFERENCES:
patent: 4195243 (1980-03-01), Thaxter
patent: 4491759 (1985-01-01), Kunz et al.
patent: 4513219 (1985-04-01), Katsuma et al.
patent: 4736129 (1988-04-01), Endo et al.
patent: 4763148 (1988-08-01), Tsukimoto et al.
patent: 4779018 (1988-10-01), Okuno et al.
patent: 4788468 (1988-11-01), Izukawa et al.
patent: 4857793 (1989-08-01), Okuno
Brother Kogyo Kabushiki Kaisha
Budd Mark O.
Dougherty Thomas M.
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