Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1991-04-10
1993-09-07
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
333195, H01L 4108
Patent
active
052432491
ABSTRACT:
A surface-acoustic-wave device comprises a substrate of piezoelectric material providing for the propagation of surface acoustic waves along a channel formed on an upper major surface of the substrate, a plurality of interdigital electrodes provided on the piezoelectric substrate major surface in a row, in correspondence to the channel, such that the electrodes are aligned in the propagating direction of the surface acoustic waves, each of the plurality of interdigital electrodes having a first art connected to a bonding pad on the substrate for external electric connection and having a plurality of finger electrodes extending in parallel, spaced relationship with respect to each other in a direction transverse to and crossing the channel, and a second part separated from the first part and having a plurality of finger electrodes extending in parallel, spaced relationship with respect to each other and in a direction opposite to the direction of the finger electrodes of the first part and transverse to and crossing the channel. An interconnection pattern is provided on the surface of the substrate in correspondence to a region thereof which is offset from the channel for interconnecting the respective second parts of the adjacent interdigital electrodes.
REFERENCES:
patent: 4203082 (1980-05-01), Tsukamoto et al.
patent: 4223284 (1980-09-01), Inoue et al.
patent: 4247836 (1981-01-01), Redwood et al.
patent: 4492990 (1985-01-01), Hikita
patent: 4649357 (1987-03-01), Nagai et al.
patent: 5115160 (1992-05-01), Knoll et al.
Patent Abstracts of Japan, vol. 8, No. 88 (E-240) Apr. 21, 1984 & JP-A-59 008420 (Citizen) Jan. 17, 1984.
Patent Abstracts of Japan, vol. 7, No. 111 (E-175) May 14, 1983 & JP-A-58 031608 (Tokyo Shibaura Denki) Feb. 24, 1983.
Miyashita Tsutomu
Satoh Yoshio
Budd Mark O.
Dougherty Thomas M.
Fujitsu Limited
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