摘要:
In order to promote reception of transmitted data, an image-processing apparatus is connected to a plurality of image-processing apparatuses through a network and has a designation unit to receive a designation of an arbitrary destination user as a receiver of data; a storing unit to store the data in a storing device so as to enable reading of the data by an operation by the destination user designated by the designation unit; and a control unit to execute a predetermined action with respect to the destination user designated by the designation unit when no reading operation for the data is executed by the destination user after a predetermined elapse of time from storing the data in the storing device.
摘要:
In a digital image forming apparatus wherein a user can change a gradation curve of the density of reproduced image plotted against the input image signal obtained by reading a document, it is needed to compensate a change of color of a reproduced image accompanied by the selection of a changed gradation curve. Then, when input multi-tone image signals of R, G and B are converted to multi-tone image signals of Y, M and C for printing, the masking coefficient used for the conversion from R, G and B to Y, M and C is changed according to the changed gradation curve. Then, the multi-tone image signals of Y, M and C are converted to light quantity data of a beam for exposing a photoconductor to form an image on the photoconductor according to the gradation curve.
摘要:
In a digital image forming apparatus, a document image is read as digital data, and an image type of bi-level image or multi-level image is discriminated from the digital data. For a bi-level image, an intensity of laser beam for exposing a photoconductor is modulated according to the image data with a duty ratio of 100%. On the other hand, for a multi-level image such as a photograph image, the intensity of laser beam is modulated with a duty ratio in the unit of two or more dots according to the image data. The duty ratio and the laser output power are changed according to a type of document image or according to sensitivity characteristic of the photoconductor.
摘要:
In a digital image forming apparatus, a user can select a desired gradation curve representing the relation of the density of reproduced image to the input image signal obtained by reading a document among a plurality of gradation data stored in a memory in correspondence to image forming conditions of an electrophotographic process of forming an image. The image forming condition is determined separately. A gradation correction data is calculated from the gradation data to realize the object gradation curve. Then, an input image signal is converted to light quantity data for a beam for exposing a photoconductor by using the calculated gradation correction data to form a latent image on a photoconductor in the image forming conditions.
摘要:
In an electrophotographic image forming apparatus including a charger for electrically charging the photoconductor to a predetermined initial electric potential, a laser projects a light onto the photoconductor so as to form an electrostatic latent image thereon, and a developing device develops the latent image with toner so as to form a toner image thereon. Further, a charger controller controls the charger based on a detection result of a detector for detecting a state of the photoconductor so that the initial electric potential of the photoconductor changes in a predetermined range, and a selection controller selects one of the plurality of gradation correction data stored in a storage unit based on the detection result of the detector when the initial electric potential of the photoconductor is an upper or lower limit value of the predetermined range. Moreover, a light projecting controller controls the laser to change a light amount of the light projected, based on the gradation correction data selected by the selection controller, according to an image density signal for representing densities of respective pixels of an image to be formed.
摘要:
In a digital image forming apparatus with use of electrophotographic process, an electrostatic latent image is formed by modulating the intensity of laser beam according to image data to expose a photoconductor in the raster scan to form an electrostatic latent image. A scan line is divided into groups of consecutive dots, and the exposure of the photoconductor with the beam is allowed only for a predetermined light-emitting time within the time needed to scan a predetermined period of consecutive dots in the scan line direction. Thus, the exposure is stopped periodically and the smoothness of a reproduced image is improved.
摘要:
An apparatus and a method for forming an image with use of electrophotographic process, wherein the effect of the diffusion of electrostatic latent image and of beam size is compensated by changing the quantity of light for exposure, a gamma transformation table or a dither threshold value according to the detected value of the surface electric potential of a photoconductor or according to code information put on a support member of the photoconductor.
摘要:
An apparatus such as a digital printer for forming a image with use of electrophotographic process with a reversal development system, the density is controlled automatically by varying the sensitizing electric potential V.sub.O of the photoconductor and the bias electric voltage V.sub.B of the development unit according to the detected density of the standard toner pattern, while gradation correction fog elimination and/or color balance can be performed at the same time automatically or manually by adjusting V.sub.O and V.sub.B.
摘要:
An image forming apparatus using a dual component developer. The apparatus comprises a first detection device for detecting a toner density of the developer; a second detection device for detecting an amount of a used toner; a determination device for determining an amount of the toner to be supplied in accordance with the toner density detected by the first detection means; and a revision device for revising the amount of the toner to be supplied determined by the determination means in accordance with the amount of used toner detected by the second detection means.
摘要:
A cleaner in a transfer section of a copying machine for cleaning a soil toner transferred from a photoconductive member and adhering to the surface of a transfer drum, which includes a cleaning device which electrically attracts and cleans the soil toner on the surface of the transfer drum and an electrode disposed at the interior surface of the transfer drum for weakening the electrostatic force between the soil toner and the surface of the transfer drum. The electrode disposed in the interior of the dielectric drum is movable.