Abstract: The object of the present invention is to provide a color correction process designed for enabling all the hues in the image properly corrected without leaving any uncorrected range; the inputted image data represented by the combination of 3 color signals is divided into a plurality of ranges by the hue so that color correction can be made by the range of each hue; in the color correction processing circuit by each hue, in order for the peripheral area of the range set for color correction to be prevented from being left uncorrected, the color correction process is designed so that correction ranges peripherally overlap with one another.

Abstract: The object of the present invention is to provide a color correction process designed for enabling all the hues in the image properly corrected without leaving any uncorrected range; the inputted image data represented by the combination of 3 color signals is divided into a plurality of ranges by the hue so that color correction can be made by the range of each hue; in the color correction processing circuit by each hue, in order for the peripheral area of the range set for color correction to be prevented from being left uncorrected, the color correction process is designed so that correction ranges peripherally overlap with one another.

Abstract: A color image forming apparatus is provided wherein toner images formed on a plurality of image carriers are primarily transferred onto an intermediate transfer object, and then, are secondarily transferred onto a recording sheet. The color image-forming apparatus includes an intermediate transfer member, a longitudinal direction of which is arranged in substantially a vertical direction, and onto which toner images formed on image carriers are sequentially transferred in such a manner that the toner images overlap relative to each other so as to form a color toner image on the intermediate transfer member. In addition, a transferring device is provided to transfer the color toner image formed on the intermediate transfer member onto a transfer sheet. The intermediate transfer member and the image carriers are integrated into a rack, and the rack is drawable in substantially a horizontal direction with respect to a mainframe of the color image-forming apparatus.

Abstract: The present invention concerns a color image forming apparatus wherein toner images formed on a plurality of image carriers are primarily transferred onto an intermediate transfer object, and then, are secondarily transferred onto a recording sheet.

Abstract: The present invention concerns a color image forming apparatus wherein toner images formed on a plurality of image carriers are primarily transferred onto an intermediate transfer object, and then, are secondarily transferred onto a recording sheet.

Abstract: The present invention concerns a color image forming apparatus wherein toner images formed on a plurality of image carriers are primarily transferred onto an intermediate transfer object, and then, are secondarily transferred onto a recording sheet.

Abstract: An image forming apparatus includes a reversing unit for reversing a two-sided document and placing the document on a platen, a reading unit for reading image data of either a front or back side of the document placed on the platen by the reversing unit, and at least one of: (i) a first detecting/setting unit for providing first information representing a position on which a binding margin of the document is located and a direction in which a top or bottom portion of the document is directed, and (ii) a second detecting/setting unit for providing second information representing a position on which a binding margin of an image to be printed is located and a direction in which a top or bottom portion of the image to be printed is directed.

Abstract: An apparatus for forming images on at least one surface of a sheet includes a reader for reading image information on documents, a memory for storing image signals output by the reader, and an image forming unit for selectively forming one of: (i) two page toner images corresponding to the image signals of two pages of the documents separately on two image carrying members, and (ii) a single toner image on one of the two image carrying members. A jam detector detects a jammed sheet, and a delivery detector detects delivery of a copied sheet to outside the apparatus. Image signals are eliminated from memory in accordance with a progression of image formation.

Abstract: An image forming apparatus includes a first image carrier on which a toner image forming device forms a toner image; a second image carrier provided opposite to the first image carrier, onto which the toner image on the first image carrier is transferred; first and second transfer devices for transferring the toner image on the first and second image carriers onto one side and the other side of a transfer material, respectively; and a fixing device for fixing the toner images on both sides of the transfer material transferred respectively by the first and second transfer devices. The fixing device includes first and second fixing members provided opposite to one side and the other side of the transfer material, respectively, wherein the transfer material passes between the first and second fixing members, and first and second sensors are provided for detecting temperature of the first and second fixing members respectively.

Abstract: An image forming apparatus for forming images corresponding to image data of plural pages.

Abstract: An apparatus for forming an image on a sheet member includes a photoreceptor drum on which a first toner image and a second toner image are separately formed; an image carrying belt on which the second toner image is transferred from the photoreceptor drum; a first transfer device to transfer the first toner image from the photoreceptor drum to a first side of the sheet member; a second transfer device to transfer the second toner image from the image carrying belt to the other side of the sheet member; and a cleaner capable of being brought in contact with anal separated from the image carrying belt. The cleaner is brought in contact with the image carrying belt after the first toner image is transferred from the photoreceptor drum to the first side of the sheet member.

Abstract: In an image forming apparatus provided with a photoreceptor on which a obverse toner image is formed, a toner image receiving body on which a reverse toner image is transferred from the photoreceptor, and transfer devices to transfer the obverse image onto one side of a sheet and to transfer the reverse image onto the other side of the sheet. An image forming condition for the reverse image is changed to be different from that for the obverse image.

Abstract: An image forming apparatus has a photoreceptor drum and a toner image receptor for forming toner images on both sides of a transfer sheet.

Abstract: An optical system assembling method in an image forming apparatus in which there are provided an image forming body around which a plurality of exposure device each having a linear exposure optical system to imagewise expose on the image forming body, and a plurality of developing device containing respective color toners different from each other which are superimposed on the image forming body to form a color toner image, the method further having the steps of: lighting the exposure optical system; forming an image emitted from the exposure optical system on a sensor which is disposed at a position corresponding to a photosensitive surface of the image forming body with respect to the exposure optical system; adjusting a position of the exposure optical system on the basis of a result of the image forming so that a focal point of the exposure optical system is coincident with a surface of the sensor; and fixing at the adjusted position the exposure optical system to an optical system supporting body provide

Abstract: An image forming apparatus includes: a photoreceptor drum; a charger for charging an outer surface of the photoreceptor drum; image exposure devices each for exposing the photoreceptor drum to form a latent image thereon, wherein the image exposure devices are provided inside the photoreceptor drum, and are detachably mountable with the photoreceptor drum to the image forming apparatus; a developing device for developing the latent image to form a toner image on the outer surface of the photoreceptor drum; and a supporting member on which the image exposure devices are mounted, wherein the supporting member and the photoreceptor drum are connected through bearing members on both ends of the photoreceptor drum, and the supporting member has an engaging portion for engaging with a part of the image forming apparatus to fix the image exposure devices through the supporting member, while the photoreceptor drum is rotated around the image exposure devices through the bearing members.

Abstract: A color image forming apparatus wherein an image forming body has a inner surface and a outer surface, a charging device electrically charges the outer surface, and an exposure device imagewise exposes the inner surface. A developing device is used to form a first toner image on the outer surface. A unit is detachablly mounted in a housing of the apparatus, wherein the image forming body and a plurality of the exposure devices are provided in the unit.

Abstract: An image forming apparatus for forming an image on an image forming body by scanning a plurality of modulated laser beams is disclosed. The apparatus is provided with a generator to generate a plurality of reference signals each with a differrent phase from other reference signals, a detector for detecting the difference of image density between two adjacent image pixels, combined modulator to generate a modulated laser beam by combining a selected laser beam, a selected reference signal and the image density. The detector classifies each pixel as one of an edge starting pixel, an edge ending pixel, and a non-edge pixel based on the value of image density difference relative to positive and negative threshold values. The selection of the laser beam and the reference signal is based on the image density difference detected by the detector and the class of the pixel.

Abstract: A color image forming apparatus provided with plural charging devices, plural image exposure devices, and plural developing devices which are arranged around the outer circumference of a photoreceptor so that a color image is formed during a single rotation of the photoreceptor. The apparatus comprises a supporting cylinder for enclosing the photoreceptor and for supporting the plural image exposure devices thereon.

Abstract: In an apparatus in which a yellow, magenta, and cyan toner images are superimposed on a photoreceptor drum made of a transparent material, an image exposure device is provided in the photoreceptor drum and emits exposure lights whose wavelength has a spectral reflective ratio lower than 30% for at least two of yellow, magenta, and cyan toners. The image forming processes is controlled so that a toner image for which the exposure lights have a spectral reflective ratio larger than 30% is formed after toner images for which the exposure lights have a spectral reflective ratio lower than 30% have been formed.

Abstract: An apparatus for forming Y, M, C, and BK color toner images, includes a controller to control an exposure device to conduct a pre-transfer image exposure on the color toner images on the photoreceptor on the basis of recording signals after the final color toner image formation of the Y, M, C, and BK color toner images before transferring the color toner images.