Abstract: An image forming apparatus comprises: an image forming unit to form an image onto a recording medium; a measuring unit to measure a density of the image formed on the recording medium; a controller to execute an image stabilizing control to decide image forming conditions of the image forming unit on the basis of the image density measured by the measuring unit; a heater to heat a load by supplying a current to the image forming apparatus; and a detector to detect a temperature of the load which is heated by the heater, wherein the controller controls the execution of the image stabilizing control in accordance with an output of the detector at the start of the power supply to the apparatus. When the detected temperature of the load is less than a predetermined value, the image stabilizing control is executed. When it is equal to or higher than the predetermined value, the image stabilizing control is not performed.

Abstract: This invention relates an image forming apparatus capable of automatically adjusting image formation conditions. A transfer medium having a detecting pattern image formed by an apparatus main body is read by an original reading unit. A look-up table for setting latent image formation conditions is corrected on the basis of a read output, thereby correcting image densities in a main-scan direction and/or a sub-scan direction.

Abstract: An object of the present invention is to provide an invisible information recorded medium having an identification mark. In order to achieve the object, an invisible information recorded medium is provided having an identification mark recorded thereon, the identification mark being composed of a region having a high reflectance and a region having a low reflectance as compared with the reflectance of the medium in the same near infrared ray region.

Abstract: A specified original that is not supposed to be copied is marked with a pattern that is formed by infrared reflected light. A copying apparatus includes a detecting unit for detecting the pattern and determines that an original is the specified original in accordance with the detection by the detecting unit. A copying operation is controlled in accordance with the determination of whether the original is the specified original that is not supposed to be copied.

Abstract: An image forming apparatus for controlling image forming conditions regarding the image quality comprises an image forming unit to form an image onto a recording medium such as a paper, a generator to generate pattern data to form an image of a stripe pattern of a predetermined interval by the image forming unit, a reader to read the stripe pattern image which is formed by the image forming unit in accordance with the pattern data which is generated from the generator, a memory to store the stripe pattern image read by the reader, a detector to detect the interval of the stripes of the stripe pattern stored in the memory, and a controller to control the image forming unit on the basis of the stripe interval detected by the detector.

Abstract: This invention has as its object to reduce the apparatus scale by simplifying the arrangement of an image reading apparatus for radiating light including both visible and non-visible components, and detecting light obtained from a predetermined image, and provides an image reading apparatus which has illumination means for simultaneously radiating both light including a visible component and light including a non-visible component, and detection means for detecting light obtained from a predetermined image in accordance with the light radiated from the illumination means, including filter means which can be switched in accordance with whether the visible or non-visible component is radiated from the illumination means onto the predetermined image, and control means for controlling a switching operation of the filter means.

Abstract: An image forming apparatus includes an image forming unit for forming an image on a recording medium, and a measurement unit which measures the density of the image formed on the recording medium. A control unit determines an operation condition of the image forming unit on the basis of the measurement result from the measurement unit. A storage unit stores the operation condition determined by the control unit, and a display unit reads out the operation condition at a predetermined time for display. The control means controls a subsequent operation of the image forming apparatus according to the stored operation condition.

Abstract: This invention intends to reduce, in the formation of a color image in consideration of the reproducible color region in the image formation, the time required from the start of image formation to the formation of a reproduced full-color image. This is achieved by judging, by a selection circuit 14, whether the color space of the full-color original is within the color reproduction region of the printer, and setting an image processing condition by the selection circuit 14, according to the result of the judgment, after the image formation of a first color but prior to the image formation of a second color.

Abstract: An image forming apparatus forms a predetermined test image, detects a spatial frequency characteristic of the test image, and determines an optimum image forming condition on the basis of the detected spatial frequency characteristic.

Abstract: A color image forming apparatus for automatically setting an image forming condition includes an electrophotographic photosensitive member movable along an endless path; an electrostatic latent image forming device for forming electrostatic latent images for different colors on the photosensitive member; a plurality of developing device containing different color toners, operable corresponding to the electrostatic latent image; a transfer device for overlaying developed images sequentially onto a transfer material; a monitor image forming device for forming a monitor image; a control device for controlling the image forming condition on the basis of the monitor image; wherein detection of the monitor images for the respective developing device is completed with one-half the time required for the photosensitive member to rotate for image formation by all of the developing device.

Abstract: The present invention provides an electrophotographing apparatus for forming a color image of an improved image quality. For the provision of such an apparatus, a plurality of color developing means are arranged in the traveling direction of the electrophotographing member. The length of the traveling direction of the photosensitive member becomes longer, and the dark attenuation characteristics are created. The resultant problems which tend to lower the image quality are solved.In consideration of the dark attenuation characteristics of an electrophotographing photosensitive member, the present invention performs fine color adjustments according to each color of an developing image. In this adjustment, the gradation is corrected, or the color is corrected, per color in accordance with the dark attenuation characteristic.

Abstract: An image forming apparatus has an image bearing member; a toner image forming device for forming a toner image on the image bearing member; a transfer charger for transferring the toner image from the image bearing member onto a transfer material; a first detector for detecting toner charge amount before image transfer onto the transfer material; a second detector for detecting the efficiency of the image transfer; and a controller for controlling a condition of image transfer operation in accordance with outputs of the first and second detector.

Abstract: An image forming apparatus includes an image forming means, for forming an image on an image receiver member, which in turn includes an image bearing member on which a toner image can be born, a latent image forming means for forming a latent image modulated by an electric signal on the image bearing member, and transfer means for transferring the toner image onto the image receiver sheet. Also included in the image forming apparatus are first detection means for detecting the density of the toner image on the image bearing member before an image transferring operation, second detection means for detecting the density of the toner image on the image receiver member after the image transferring operation, and control means for controlling a transferring condition of the transfer means and an image forming condition of the latent image forming means on the basis of detection results from the first and second detection means.

Abstract: According to the present invention, an image forming apparatus comprises an image forming unit for producing an image on paper, a detector for detecting a plurality of parameters indicating a state of the image forming unit, a corrector for correcting the state of the image forming unit, a rule memory for storing rules for determining the relation between the parameters and the timing of operation of the corrector, and a control for controlling the corrector according to the parameters the detector detects and the rules stored in the memory. Therefore, even a simple configuration permits high-precision control. This reduces a time loss due to the correcting operation, minimizes consumption of development agent, and thus ensures constant gradation all the time.

Abstract: An image processing apparatus, which improves the image quality in gradation control, measures the density of a specified gradation pattern formed on a photosensitive drum with a photosensor and prepares a look-up table for gamma correction, based on thus measured density. Formation of a pseudo-contour is prevented by control of the inclination of the gamma correction curve represented by the data of the look-up table.

Abstract: The present invention relates to a toner image density detecting mechanism for an image forming apparatus which includes an image bearing layer supported on a rotatable cylindrical member, a device for forming a plurality of toner reference patterns on the image bearing layer at respective positions which equally divide a circumference of the cylindrical member, a detector for detecting an image density of the toner image of the reference pattern, and a controller controlling an image forming condition in accordance with an output of the detector; wherein an average of the image densities is determined for use in a control operation of the controller. Preferably, the toner used has a reflective or absorbing rate not less than 1.5 times that of the image bearing layer.

Abstract: A color image forming apparatus comprising: an input device for inputting image signals denoting a plurality of color components; an under color processing device for processing the under colors of the image signals denoting a plurality of the color components supplied by the input device; an image forming device for forming images in response to the image signals denoting a plurality of the color components, which have been processed by the under color processing device, and image signals denoting the under colors by using coloring agents which correspond to a plurality of the color components and the under colors, the coloring agents, which correspond to the under colors, having glossiness lower than that of the coloring agents which correspond to a plurality of the color components; and a control device for controlling the glossiness of the image formed by the image forming device by controlling the quantity of process of the under colors processed by the under color processing device.