Method for electrostatic reproduction by charge transfer

Details Method for electrostatic reproduction by charge transfer Method for electrostatic reproduction by charge transfer

1973-03-02

1976-08-03

Klein, David

Gas separation: apparatus

Magnetic separating means

355 3R, G03G 1322

Patent

active

039727149

ABSTRACT:
Method and apparatus for electrostatic reproduction of originals by transfer of a latent charge image from an intermediate surface to an uncharged insulating surface by moving the intermediate and insulating surfaces to a virtual contact point and producing an external electric field between a pair of electrodes at the virtual contact point to ionize the space between the intermediate and insulating surfaces to transfer the charge image progressively therebetween on a line-by-line basis, instantaneously. The apparatus includes a first drum having an insulative dielectric or photoconductive intermediate surface thereon and a second drum moving the insulating surface to a point in immediate tangential proximity to the intermediate surface such that the intermediate and insulating surfaces are moved in respective converging paths toward the point of immediate tangential proximity and in diverging paths away from the point of immediate tangential proximity with the first and second drums forming a pair of electrodes to establish the external field. The external electric field can be produced from a direct current voltage or from an alternating current voltage, the auxiliary field established by either of these sources being added to the field established by the charge image to exceed, for at least a portion of the time during which a point of the charge image is in an ionization zone between the drums, an ionization potential to transfer the charge.

REFERENCES:
patent: 2833648 (1958-05-01), Walkup
patent: 3464818 (1969-11-01), Waly
patent: 3666458 (1972-05-01), Arneth et al.
patent: 3672930 (1972-06-01), Trachtenberg

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