Abstract: An image forming apparatus includes: an image former that forms an image, which is desired by a user and different from a predetermined pattern, on a sheet; an output information detector that detects output information on a first image formed on a first sheet by the image former; and a hardware processor that: acquires an correction amount of a third image, which is formed on a third sheet after the first sheet and a second sheet, according to a detection result of the first image by the output information detector and image information on a second image formed on the second sheet after the first sheet by the image former; and controls the image former so as to correct the third image based on the correction amount acquired by the hardware processor.

Abstract: There is provided an image forming apparatus capable of suppressing fluctuation of sensor output. The image forming apparatus includes, an image bearing member, a photosensor and a hardware processor. The image bearing member has a layered structure in which a surface layer is laminated on a base material layer. The photosensor irradiates a surface of the image bearing member on which a toner image is formed with detection light on the basis of a predetermined detection condition, and receives reflected light of the detection light reflected from the surface of the image bearing member. The hardware processor controls at least a dominant wavelength of the photosensor among the predetermined detection conditions such that light interference and dark interference are included in the reflected light, and controls a toner adhesion amount onto the image bearing member on the basis of an output of the photosensor.

Abstract: An image forming apparatus that forms an output image corresponding to input image data on an image carrier by superimposing toner images of colors, includes a hardware processor that: detects color information of the output image for every pixel region; converts color information of the input image data for every pixel region and color information of the output image for every pixel region into indexes which define colors in predetermined color space coordinates; extracts a pixel region in which the color information of the output image is different from the color information of the input image data, and corrects the color information of the input image data with respect to the extracted pixel region; and stores the color information of the input image data as data for calibration in combination with the color information of the output image and image forming conditions when forming the output image.

Abstract: There is provided an image forming apparatus capable of suppressing fluctuation of sensor output. The image forming apparatus includes a photosensor and a hardware processor. The photosensor has a layered structure in which a surface layer is laminated on a base material layer, irradiates a surface of an image bearing member on which a toner image is formed with detection light on the basis of a predetermined detection condition, and receives reflected light of the detection light reflected from the surface of the image bearing member. The hardware processor controls at least a dominant wavelength of the photosensor among the predetermined detection conditions such that light interference and dark interference are included in the reflected light, and controls a toner adhesion amount onto the image bearing member on the basis of an output of the photosensor.

Abstract: An image forming apparatus includes: an image former that forms an image, which is desired by a user and different from a predetermined pattern, on a sheet; an output information detector that detects output information on a first image formed on a first sheet by the image former; and a hardware processor that: acquires an correction amount of a third image, which is formed on a third sheet after the first sheet and a second sheet, according to a detection result of the first image by the output information detector and image information on a second image formed on the second sheet after the first sheet by the image former; and controls the image former so as to correct the third image based on the correction amount acquired by the hardware processor.

Abstract: An image forming apparatus that forms an output image corresponding to input image data on an image carrier by superimposing toner images of colors, includes a hardware processor that: detects color information of the output image for every pixel region; converts color information of the input image data for every pixel region and color information of the output image for every pixel region into indexes which define colors in predetermined color space coordinates; extracts a pixel region in which the color information of the output image is different from the color information of the input image data, and corrects the color information of the input image data with respect to the extracted pixel region; and stores the color information of the input image data as data for calibration in combination with the color information of the output image and image :forming conditions when forming the output image.

Abstract: An image forming apparatus includes: a primary transfer unit configured to transfer a toner image formed on an image carrier onto an intermediate transfer belt through primary transfer; and a secondary transfer unit configured to transfer the toner image formed on the intermediate transfer belt onto a recording medium through secondary transfer, wherein the secondary transfer unit extends along a width direction of the recording medium and includes a roller pair and a switching unit, the roller pair being configured to nip the intermediate transfer belt and the recording medium such that the intermediate transfer belt and the recording medium are in pressure contact with each other, the switching unit being configured to switch a length of at least one of the roller pair in a shaft direction.

Abstract: An image forming apparatus includes: a primary transfer unit configured to transfer a toner image formed on an image carrier onto an intermediate transfer belt through primary transfer; and a secondary transfer unit configured to transfer the toner image formed on the intermediate transfer belt onto a recording medium through secondary transfer, wherein the secondary transfer unit extends along a width direction of the recording medium and includes a roller pair and a switching unit, the roller pair being configured to nip the intermediate transfer belt and the recording medium such that the intermediate transfer belt and the recording medium are in pressure contact with each other, the switching unit being configured to switch a length of at least one of the roller pair in a shaft direction.

Abstract: In image-checking equipment, a detector reads a line-shaped check image formed on a sheet and acquires image data on the check image. A controller calculates an edge blur in a rising edge and a falling edge of the image data, calculates a line width of the check image. The controller refers to a correction table with the measured values of the edge blur and the line width of the check image, and acquires a corrected line width value based on the correction table to obtain the real line width of the check image.

Abstract: In image-checking equipment, a detector reads a line-shaped check image formed on a sheet and acquires image data on the check image. A controller calculates an edge blur in a rising edge and a falling edge of the image data, calculates a line width of the check image. The controller refers to a correction table with the measured values of the edge blur and the line width of the check image, and acquires a corrected line width value based on the correction table to obtain the real line width of the check image.

Abstract: Image forming apparatus (100) creates a toner pattern on intermediate transfer belt (11) as a preprocessing of gradation correction, and calculates a cycle at which density unevenness is largest. Then, a toner image for gradation correction is formed so as to cancel cyclic unevenness at a cycle at which the largest density unevenness occurs. As a result of this, it becomes possible to suppress the deterioration of density detection accuracy and perform a highly accurate gradation correction even if density unevenness of any cycle occurs.

Abstract: An image forming apparatus may include an image carrier for carrying a toner image and a correcting toner image, a detection sensor for detecting density information of the correcting toner image; and a controller for causing the image forming unit to correct an image forming condition based on the density information detected by the detection unit to execute a stabilization control. The image forming unit may form a plurality of correcting toner images different in density over plural non-image areas. The controller may determine which mode is set between a processing speed priority mode and an image quality priority mode. The image forming unit may continuously form correcting toner images on the image carrier in a different manner depending on the mode. The detection sensor may detect density information of the correcting toner images. The image forming unit may finish a processing operation in the stabilization control under execution.

Abstract: An image forming apparatus may include a sensor which detects a density of a patch image formed on an image carrier; an image quality control section which controls an image forming condition based on a detection value of the sensor; and a judging section which judges if the detection value has a tendency of increasing or decreasing, or not, wherein, the image quality control section compensates the image forming condition with a first compensating amount in case when the detection value does not have the tendency of increasing nor decreasing, and compensates the image forming condition with a second compensating amount of which absolute value is larger than an absolute value of the first compensating amount corresponding to the second compensating amount, in case when the detection value has the tendency of increasing or decreasing.

Abstract: Provided are an image forming apparatus and an image forming method capable of easily forming an output image having desired gradation characteristics and capable of reducing running cost. In an intermediate transfer-type image forming apparatus, an image forming section is configured by including a first image forming section which forms a color toner image on a photoconductor, and a second image forming section which is located on the upstream side of the first image forming section and forms a transparent toner image on the photoconductor. Further, after the transparent toner image is formed on an intermediate transfer member by the second image forming section, the first image forming section forms, on the basis of image data (correction gradation values) corrected by a gradation correcting section, a color toner image so that the color toner image is superimposed on the transparent toner image.

Abstract: Image forming apparatus (100) creates a toner pattern on intermediate transfer belt (11) as a preprocessing of gradation correction, and calculates a cycle at which density unevenness is largest. Then, a toner image for gradation correction is formed so as to cancel cyclic unevenness at a cycle at which the largest density unevenness occurs. As a result of this, it becomes possible to suppress the deterioration of density detection accuracy and perform a highly accurate gradation correction even if density unevenness of any cycle occurs.

Abstract: An image forming apparatus including: an image forming unit including an image carrier for carrying a toner image to be transferred onto a sheet and a correcting toner image to be used for adjusting a density of the toner image, a detection sensor for detecting density information of the correcting toner image formed in a non-image area by the image forming unit, and a controller for causing the image forming unit to correct an image forming condition based on the density information to execute a stabilization control, wherein, when receiving at least one information of interruption information, mode switching information and job switching information during execution of the stabilization control, the controller causes the image forming unit continuously form non-formed residual correcting toner images different in density on the image carrier before finishing a processing operation in the stabilization control under execution.

Abstract: An image forming apparatus comprising: a sensor which detects a density of a patch image formed on an image carrier; an image quality control section which controls an image forming condition based on a detection value of the sensor; and a judging section which judges if the detection value has a tendency of increasing or decreasing, or not, wherein, the image quality control section compensates the image forming condition with a first compensating amount in case when the detection value does not have the tendency of increasing nor decreasing, and compensates the image forming condition with a second compensate amount of which absolute value is larger than an absolute value of the first compensating amount corresponding to the second compensate amount, in case when the detection value has the tendency of increasing or decreasing.