Appeal No. 1997-1592
Application No. 08/325,566
Aizawa describes a method and apparatus for developing latent electrostatic images formed on
the surface of an image bearing material. (Abstract). In particular, the method involves magnetically
retaining a relatively conductive one-component developer on the surface of a developer-retaining
member and contacting the developer with the surface of an image-bearing material which has formed
thereon a latent electrostatic image. (Col. 4, lines 19-29). The developer-retaining member is formed
of a stationary sleeve disposed so that its surface approaches the surface of a photosensitive material in
a developing zone. (Col. 5, lines 27-30 and Fig. 1). Aizawa describes the resistance of the developer-
retaining member as preferably ranging from 5 x 10 ohms to 5 x 10 ohms. (Col. 6, lines 34-42 and7 8
col. 9, lines 25-30). This resistance can be achieved by forming a synthetic resin surface layer
containing carbon black particles dispersed therein on an insulating coating of the sleeve or by forming
the synthetic resin layer directly on the conductive main body of the sleeve. (Col. 9, lines 30-35).
In example 1 of Aizawa, five sleeves were provided each of which consisted of a main body of
aluminum and an aluminum oxide layer formed on the main body by anodization.
(Col. 9, lines 53-55). The surface of each of the sleeves was uniformly coated with a viscous
composition which comprised carbon black powder (“Special Black No. 4,” a product of DeGussa
Corporation), an oil-soluble dye, tetrahydrofuran and a vinyl chloride copolymer.
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