報文
Image Formation in Binder Type Photo-migration Imaging Film
1981 年 19 巻 3 号 p. 94-101
詳細
1981 年 19 巻 3 号 p. 94-101
The mechanism of image formation in binder type photo-migration imaging film was investigated.
When a photo-migration imaging film having a thin layer comprising Cu phthalocyanine dispersed in a rosin derivative was electrostatically charged, imagewise exposed and processed with a solvent liquid, positive-to-positive imaging resulted in the case of positive surface charging, while negative imaging took place in the case of negative surface charging, with a solarization region occurring for larger exposures.
These experimental results can be explained by considering the following two factors, both caused by light simultaneously:
i) the charge polarity change in individual particles from positive to negative, and
ii) the imagewise distribution of the electric field across the layer.
The rate of polarity change by light proved to be strongly field-depent. In the solarization region, the field substantially collapsed, whereby further exposure promoted the negatively charged particles to return to the thermally equilibrated, positively charged state.
