Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1981-10-27
1985-03-12
Moses, Richard L.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
118661, 430119, 355 77, G03G 1510
Patent
active
045041385
ABSTRACT:
A method of developing a latent electrostatic charge image formed on a photoconductor surface comprising the steps of applying a thin viscous layer of electrically charged toner particles to an applicator roller preferably by electrically assisted separation thereof from a liquid toner suspension, defining a restricted passage between the applicator roller and the photoconductor surface which approximates the thickness of the viscous layer, transferring the toner particles from the applicator roller to the photoconductor surface due to the preferential adherence thereof to the photoconductor surface under the dominant influence of the electric field strength of the electrostatic latent image carried by said photoconductive surface, the quantity of toner particles transferred being proportional to the relative incremental field strength of the latent electrostatic image. Apparatus is provided for carrying out the method of the invention which includes an applicator roller mounted for rotation in a container for toner suspension, an electrode arranged adjacent the circumferential surface of said roller to define an electrodeposition chamber therebetween and electrical connections between the said roller, electrode and a voltage source to enable electrolytic separation of toner particles in the chamber forming a thin highly viscous layer of concentrated toner particles on the roller, the roller arranged to define a virtual "zero" gap with the photoconductive surface carrying the latent electrostatic image, the virtual "zero" gap approximating the thickness of the electrodeposited toner layer.
REFERENCES:
patent: 4259005 (1981-03-01), Kuehnle
patent: 4262998 (1981-04-01), Kuehnle et al.
patent: 4325627 (1982-04-01), Swidler et al.
patent: 4373469 (1983-02-01), Kuge et al.
Fraser Kenneth D.
Kuehnle Manfred R.
Matkan Josef
Coulter Systems Corporation
Moses Richard L.
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