Resistive intermediate transfer member

Details Resistive intermediate transfer member Resistive intermediate transfer member

G - Physics

03

G

G03G 15/08 (2006.01) G03G 15/14 (2006.01) G03G 15/16 (2006.01)

Patent

CA 2077873

An apparatus for enabling a laterally conductive, resistive backed photoconductive intermediate transfer member in an electrophotographic printing apparatus. The printing apparatus includes a toner transfer system having an intermediate transfer belt comprising a laterally conductive resistive substrate with a pre-transfer grounding device and a transfer charging device. A ground potential bias is applied to the intermediate transfer belt prior to entering a transfer nip region to generate low transfer fields therein. Subsequently, the laterally conductive resistive layer of the intermediate surface is provided with a biasing voltage, generating high transfer fields in the transfer nip. In an alternative embodiment, a post-transfer bias is applied to the intermediate transfer belt for substantially enhancing the transfer fields in the transfer nip.

Cette invention concerne un dispositif d'activation d'un élément de transfert intermédiaire photoconducteur à support résistif et à conductivité latérale d'imprimante électrophotographique. L'imprimante comprend un système de transfert de toner comportant une courroie intermédiaire de transfert à substrat résistif latéralement conducteur et à dispositif de mise à la terre pré-transfert et à circuit de charge de transfert. Un potentiel à la terre est appliqué à la courroie de transfert intermédiaire avant qu'elle n'arrive à la pince de transfert pour y générer des champs faibles de transfert. Par la suite, la surface résistive à conductivité latérale de la surface de transfert intermédiaire reçoit une tension de polarisation produisant des champs élevés de transfert à la pince de transfert. Dans une autre variante, une tension de polarisation post-transfert est appliquée à la courroie de transfert intermédiaire pour intensifier considérablement les champs de transfert à la pince.

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