Xerographic process steps

Fig. 1. (a) Steps of the xerographic process (b) schematic arrangements of hardware. 

The basic steps of the xerographic processes may be schematized as follows ... 

Early developments in xerography have been reviewed by Carlson (1965) and Schaffert (1965, 1975). More recent work has been reviewed by Scharfe (1984), Williams (1984), Mort (1989), and Schein (1988, 1992, 1995). These reviews are largely concerned with various steps in the xerographic process and... 

Figure 8 shows the xerographic process from the viewpoint of the toner. The material is fed into the development chamber, charged (usually by triboelectri-fication), and applied to the photoconductor surface. Powder which adheres to charged areas of the latent image is then transferred and fused to a sheet of paper or film the residue is cleaned off. Let us now consider these steps in greater detail. 

Not so in the xerographic photoreceptor. Recall that majority carriers generated near the surface in the exposure step must be free to migrate from the top to the bottom of the dielectric layer to enable imagewise photodischarge in the fraction of a second, available between exposure and development. While the time scale of the process does not require high mobility, deep traps for the majority carrier must be excluded from the bulk otherwise, residual potential and background will build up as the photoreceptor cycles. 

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