Electrophotography
AssigneeHitachi, Ltd.
InventorMasayasu Anzai
Life of this patent
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Abstract
Electrophotography which employs a recording medium prepared by providing a photoconductor layer and a transparent electrical insulator layer on a support. In the electrophotography, a latent charge image is formed on the surface of the insulator layer of the recording medium by the steps of uniformly applying charges of one polarity to the recording medium in a dark place, exposing the recording medium to light reflected from an original image while applying charges of the same polarity to the recording medium at the same time, applying charges of opposite polarity to the recording medium in the dark place, and uniformly exposing the entire surface of the insulator layer of the recording medium to light.
Claims10
An electrophotographic process for forming a latent charge image on the surface of a transparent electrical organic insulator layer in a recording medium having a photoconductor layer sandwiched between a conductive support and said organic insulator layer, comprising the steps of
- a. uniformly applying a D.C. corona charge of one polarity to said surface of said organic insulator layer of said recording medium in the dark;
- b. exposing areas of said uniformly D.C. corona charged surface of said organic insulator layer to light reflected from an original image while applying simultaneously a D.C. corona charge of the same polarity as that used in said uniform charging of said surface of said organic insulator layer of step (a);
- c. applying a charge of polarity opposite to that used in said steps (a) and (b) to the surface of said organic insulator layer in the dark until an electric potential on the unexposed surface of said organic insulator layer has a charge of polarity opposite to that of steps (a) and (b);
- and then
- d. uniformly exposing said charged surface of said organic insulator layer of step (c) to light.
Dependencies are inferred from the claim text.