Communications – electrical: acoustic wave systems and devices – Signal transducers
Patent
1988-11-03
1989-11-07
Jordan, Charles T.
Communications, electrical: acoustic wave systems and devices
Signal transducers
310800, 310348, 340407, 901 46, H04R 2300
Patent
active
048796980
ABSTRACT:
Piezopolymer actuator, wound in a bifilar fashion on two pins, is operated in a compressive mode without buckling. In addition to constraining motion of the winding along the surface of the pins, the pins also provide wide area electrical contacts with conductive electrodes on the surfaces of the piezopolymer strip. The electrodes consist of a thin film of metallization coated with graphite. Graphite coating heals microcracks in metallization, adds body to the piezopolymer strip, and lubricates winding-pin interfaces. Modular linear arrays of actuators are readily built from a single strip of piezopolymer. Linear array modules are in turn clamped together to form a two-dimensional array. Typical application is a tactile array for the blind.
REFERENCES:
"Cylindrical PVF.sub.2 Electromechanical Transducers" by D. H. Dameron and J. G. Linvill, Sensors and Actuators (1981/82), pp. 73-84.
"Piezoelectric Polymer Transducer Arrays" by Linvill, Proceedings of the Sixth IEEE International Symposium on Applications of Ferroelectrics, pp. 506-510.
Eldred J. Woodrow
Jordan Charles T.
Sensor Electronics, Inc.
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