| 摘要 |
An electrophotographic process for printing a number of copies from a single electrostatic charge latent image once formed on a photosensitive member by projecting an optical image of a document to be copied comprises the following successive steps; (a) a step for effecting a uniform primary electrification with one polarity for the photosensitive member; (b) a step for forming on the uniformly charged photosensitive member, a primary electrostatic latent image corresponding to the image of the document by projecting the document image to the photosensitive member; (c) a step for developing the primary latent image with opaque toner particles having charged in the other polarity to form on the photosensitive member a toned image; (d) a step for placing a transfer member over a surface of the photosensitive member on which surface the toned image has been formed; (e) a step for effecting a secondary electrification with the one polarity from a side of the transfer member and for effecting a secondary exposure also from the side of the transfer member with light which is substantially absorbed by the toners, while the transfer member being placed over the photosensitive member, to form on the photosensitive member a secondary electrostatic latent image corresponding to the primary latent image; and (f) a step for separating the transfer member from the photosensitive member to transfer the toner image onto the transfer member. After the above steps have been completed the steps (c) to (f) are repeated successively for the secondary electrostatic charge latent image repeatedly formed on the photosensitive member so as to form a number of duplicated copies.
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