Electrostatic printing and copying

Details Electrostatic printing and copying Electrostatic printing and copying

G - Physics

03

G

32/12, 117/3.5

G03G 13/22 (2006.01) G03G 15/16 (2006.01) G03G 15/18 (2006.01) G03G 15/20 (2006.01) G03G 15/22 (2006.01) G03G 15/32 (2006.01)

Patent

CA 1170117

ABSTRACT OF THE DISCLOSURE Electrostatic printing is disclosed in which an electrostatic latent image is formed on an imaging roller, toned, and transferred by pressure to plain paper. Toner transfer efficiency is improved by providing a skew between the dielectric imaging roller and a pressure roller. The latent image is formed by an ion generator consisting of two electrodes separated by a mica dielectric. The ion generator is fabricated by laminating a metal roll to mica using pressure sensitive adhesive, and etching the roll to form electrodes. An alternative ion generator consists of a dielectric-coated wire and a series of transverse conductors. A preferred method of fabricating the dielectric roller involves anodizing an aluminum cylinder, and impregnating the surface pores with a metallic salt of a fatty acid while maintaining the pores in a substantially moisture-free state. In photocopying, an electrostatic latent image is optically created on a precharged photoconductor and transferred to a dielectric member where it is developed with toner particles and the toner image is transferred to plain paper. The apparatus for either printing or photocopying may be employed for duplex imaging with simultaneous pressure transfer and fusing of the toned images.

384368

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