| 摘要 |
A latent image is formed on an electrophotographic material by imagewise application of pressure by or through a non-marking medium, i.e. one that does not make a mark by the transfer of a marking deposit to or by abrasion of the image-receiving surface. The electro photographic materials are inorganic or organic photoconductors such as zinc oxide, cadmium sulphide or a polyvinyl carbazole. Pressure may be applied by a typewriter key or pencil applied through a sheet of bond paper placed on the electrophotographic material or directly by a person's fingertips in the case of fingerprinting (Example 30). The electrophotographic material may be electrostatically charged before or after the application of pressure or not charged (Examples 26, 27, 28 and 29). The material may be exposed uniformly to ultra-violet or actinic radiation before or after charging. The latent image produced is developed with dry toner, liquid developer, or toner dispersed in a carrier liquid and then fixed.
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