The present invention is characterized in that: a demanded printing-job is accepted at a printing-job accepting unit, and a printing executing unit executes printing according to the accepted printing-job so as to produce an output sheet onto a discharge tray; an output-sheet detecting unit detects the presence of a printed output-sheet on the discharge tray; if the removal of discharged sheets from the discharge tray is detected, a printed-sheet mixture determining unit determines the possibility that sheets printed corresponding to a plurality of demands are mixed among the removed output-sheets; and if it is determined the possibility that sheets printed corresponding to a plurality of the demands are mixed among the output-sheets, warning information is produced by a warning voice producing unit.

Image-forming apparatus and image-forming method

To form a high-resolution highly stable image by using an image forming technique including gray scale expression On the assumption that the image is formed by an electrophotography process including gray scale expression, the relation between the thickness Tp of the photosensitive layer of a photosensitive element and the exposure diameter Db of a beam applied to the photosensitive element is predetermined to be 2Tp < Db, thereby reducing the charge diffusion and development field extension in the photosensitive layer of the photosensitive element From the peak value of an exposing luminous power distribution which is defined by integrating the energy distribution of the beam on the photosensitive element with respect to the exposure time, a minimum diameter at 1/e2 is selected as the exposure diameter Db of the beam, and a maximum exposure luminous power within this exposure diameter Db is set at a value with which the differential sensitivity of the photosensitive layer is sufficiently lowered With this constitution, the region of the attenuation characteristics of the photosensitive element which is good enough to obtain a high-resolution highly stable image can be used while the gray scale expression by a gray scale expressing means is realized

Image forming device and image forming method

An electrophotographic system is constituted by an electrophotographic photosensitive member, charging means for charging the photosensitive member to a potential, and exposure means for illuminating the charged photosensitive member with a light beam to form an electrostatic image thereon. The electrophotographic photosensitive member has a potential-exposure energy characteristic providing an induction energy and a γ varying depending on an electric field intensity induced by the charged potential. The electrophotographic system further includes control means for controlling the charged potential on the photosensitive member corresponding to resolution and gradation data of an original, so as to optimally reproduce the resolution and gradation, as desired, of the original.

Electrophotographic apparatus and image forming method

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Electrophotographic apparatus and image forming method