Abstract
A novel imaging process based on the polarization reversal of a ferroelectric polymer film (e.g. copolymer of vinylidene fluoride and tetrafluoroethylene) was proposed and the basic requirements for polarization reversal were investigated by D–E hysteresis measurements and also by time domain measurements of switching transients. It was found that the permissible temperature for successful image formation was 100°C. The decrease of the coercive field, however, was only 15 MV/m, apparently not large enough in the temperature range between 20°C and 100°C for practical application. However, when the film was subjected to pulse heating, such as flash light exposure (with a light-to-heat conversion layer), the polarization was reversed even at temperatures as low as 55 or 60°C under the application of a low electric field (30 MV/m). The mechanism which makes pulse heating effective in the latent image formation was pursued and a model was proposed which assumed a local field enhancement arising from a nonuniform temperature distribution in the film.
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