Electrophotographic imaging method having a double charging sequ

Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Radiation-sensitive composition or product

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430 55, 430 60, 430 67, G03G 510, G03G 514

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active

042541999

ABSTRACT:
There is described an electrophotographic imaging method which utilizes an imaging member comprising a substrate, a layer of a charge carrier injecting material, a layer of a charge carrier transport material, a layer of a photoconductive charge carrier generating material and an electrically insulating overcoating layer. In operation, the member is charged a first time with electrostatic charges of a first polarity, charged a second time with electrostatic charges of a polarity opposite to said first polarity in order to substantially neutralize the charges residing on the electrically insulating surface of the member and exposed to an imagewise pattern of activating electromagnetic radiation whereby an electrostatic latent image is formed. The electrostatic latent image may be developed to form a visible image which may be transferred to a receiver member. Subsequently the imaging member may be reused to form additional reproductions after erasure and cleaning steps are carried out.

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patent: 3676117 (1972-07-01), Kinoshita
patent: 3677751 (1972-07-01), Ohta
patent: 3953207 (1976-04-01), Horgan
patent: 4123269 (1978-10-01), Von Hoewe et al.
Nakamura I.E.E.E. Transactions on Electron Devices, vol. Ed 19, No. 4, Apr. 1972.

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