Biaxially stretched poly(p-phenylene sulfide) (PPS) film showed high photosensitivity after being amealed in oxygen for 6 hours at a temperature between 270 and 285 °C. The spectral dependence of xerographic photosensitivity of the film had a peak at around 365 nm of UV region, and xerographic gain under 365 nm irradiation was 0.1 or above. The micro-Vickers hardness of PPS reached 60 kg/mm² after annealing at 280 °C for 6 h. The annealed film can be used for a hole-transporting meterial of layered photoreceptorby depositing a thin amorphous chalcogen alloy on the annealed PPS film or constituting the film on a hydrogenated amorphous silicon carbide film. The half-decay exposure of the annealed PPS with As₂Se₃ film was 0.5 lx⋅sec under white illumination. These experimental results demonstrate that the annealing of PPS film under an oxygen environment gives this film excellent photosensitivity and mechanical durability and hence, renders this material attractive for a xerographic application.

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A new instrument which can measure latent images on the photoconductor drum installed in a xerographic printer is developed. In this instrument a gap between a measuring electrode and a photoconductor drum can be held at approximately 30 μm and electric sparks in the narrow gap can be prevented with the use of bias voltage or SF₆ gas. This instrument has a spatial resolution of as high as 10 lines/mm. It becomes possible to observe changes in latent images on organic photoconductors due to fatigue and image blurring phenomena on amorphous Si photoconductors. From these observations it is found that the edge widths of latent image spread by the fatigue or the image blurring phenomena.

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A simple electrostatic capasitor model incorporated charge generating element (four capasitor model) is shown to have the characteristics in good agreement with the experimental values obtained by dual component development system.
The charge generating element is characterized by a capasitor, which represents properties of releasing free charged toner particles in proportion to the quantity of the particles and to the residual field on the toner attracted photoreceptor layer.
The equation derived from the model is expressed as below,
Q=γε₀(V_s/V_r)/(d_s/K_s+d_t/k_t+d_c/k_cθ+d_d/αθt_ck_cM),  γ=1−exp(−t_g/r_gC).
The difference between the theory and the experiments by monocomponent development is also discussed.
All the experiments shown here have been performed by using a new charging method in which the charge is produced by the transport of water ions in applied field.

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