Polarizing of piezoelectric material

Details Polarizing of piezoelectric material Polarizing of piezoelectric material

1983-02-14

1985-04-23

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264 24, 264 27, 4251748R, 4251748E, B29D 720

Patent

active

045129410

ABSTRACT:
Electrically polarizable material (e.g., PVDF film) is poled by applying an electric field across the film. In the inventive technique, insulation is provided on the surface of the film. In a typical embodiment, a compliant dielectric annulus insulates the polarized region from the edges of the film. This substantially eliminates breakdown at the edges of the film, allowing increased poling voltages. The technique can reduce poling time to typically a few seconds at room temperature, as compared to minutes or hours by prior art techniques, some of which required elevated temperatures.

REFERENCES:
patent: 3705312 (1972-12-01), Sessler et al.
patent: 3943614 (1976-03-01), Yoshikawa et al.
patent: 4308223 (1981-12-01), Stern
patent: 4345359 (1982-08-01), Micheron
patent: 4346505 (1982-08-01), Lemonon et al.
"Piezoelectricity in Polyvinylidenefluoride," Journal of the Acoustical Society of America, G. M. Sessler, 1981, pp. 1596-1608.
"Polarization of Poly(Vinylidene Fluoride) by Application of Breakdown Fields," Journal of Applied Physics, vol. 53(10), T. T. Wang et al., 1982, pp. 6552-6556.
Wang et al., 4-23, Serial No. 350031.

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