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In the figure, xerographic photoconductor drum 10 is subjected to the conventional charging and illumination steps, so as to present a latent electrostatic image to magnetic brush developer 11.
English (United States)
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Density Control for Electrophotographic Developer
In the figure, xerographic photoconductor drum 10 is subjected to the
conventional charging and illumination steps, so as to present a latent
electrostatic image to magnetic brush developer 11.
Developer 11 is a monocomponent system; i.e., material 12 comprises only
magnetic toner. This toner possesses an electrical resistance/ capacitance
characteristic which causes the toner to inductively charge to a polarity opposite
the photoconductor's latent image, as the toner is transported to developing nip 13.
The magnitude of the toner's inductive charge, and thus the density of the
toner which is deposited on the photoconductor's latent image, is controlled by
adjustable resistor 14 which connects the magnetic brush roller to ground
potential. As a result, toners of widely varying resistance/capacitance
characteristics can be used in the copier, and by adjusting resistor 14,
consistently uniform copy quality can be obtained with these toners.
An adjustable capacitor 15 may also be used in conjunction with resistor 14.
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