Abstract: Provided is an image reading device including an irradiation section that irradiates a reading position with light, a color chart that includes plural color patches, and that is provided on a curved surface of a rotatable roller, an image capturing section that captures an image of the color chart at the reading position, and that outputs image signals which express the captured image, a correction section that corrects the image signals using a correction coefficient corresponding to the curved surface, and a calibration section that performs calibration using the image signals, which are corrected by the correction section, and representative color values of the plural color patches, the representative color values being stored in advance.

Abstract: Provided is an image forming system including one or more image forming apparatuses, each of which including an image data obtaining unit that obtains image data, and a forming unit that forms an image on a recording medium, a quality information outputting device that is provided in each of the image forming apparatuses, including an outputting unit that outputs quality information, and an information processing apparatus including a quality information obtaining unit that obtains the quality information which the outputting unit outputs, a request information obtaining unit that obtains request information, a selecting unit that selects the image forming apparatus in which the quality information outputting device which outputs the quality information satisfying the quality represented by the request information is provided, and an image data transmitter that transmits the image data to the image forming apparatus which the selecting unit selects.

Abstract: Provided is a transport device including plural rollers that are provided on a transporting path on which a sheet is transported in a transport direction and is subjected to a process at a process position, and transport the sheet which comes into contact with surfaces of the rollers in the transport direction by rotation of the rollers, among the plural rollers, first rollers that are provided closest to the process position, among the plural rollers, second rollers that are provided closest to the first rollers on an opposite side with respect to the process position, and a driving unit that drives the first rollers and the second rollers to rotate so that a speed of a surface of the first roller is faster than a speed of a surface of the second roller at least while the sheet passes through the process position.

Abstract: Provided is a reading apparatus, including a guiding portion that forms a transporting path and guides a sheet in a transporting direction, and has an opening portion communicated with an outside space of the transporting path, a light-emitting portion that emits the light toward the opening portion from the outside space, a reading portion that reads reflected light, the reflected light being emitted by the light-emitting portion, passing through the opening portion, and being at a reading part of the sheet at a reading position of the transporting path, and a shielding portion that is disposed on the light-emitting portion side of the guiding portion, and shields light which directly reaches the guiding portion among the light emitted from the light-emitting portion.

Abstract: Provided is an image reading apparatus including a guide plate that is movable between a first position and a second position and guides a medium at one side thereof when disposed at the first position, a retention member that is rotatable about an axis intersecting a direction in which the medium is guided, that has a first side surface and a second side surface which has a curvature greater than a curvature of the first side surface, and that retains plural color samples on the second side surface, a reading unit that reads, at a reading position, an image formed on the medium guided by the guide plate, and a rotating unit that causes the retention member to rotate such that the other side of the guide plate and the first side surface face each other and the plural color samples are moved to the reading position.

Abstract: Provided is an image reading apparatus, including a reading portion which reads an image and generates gradation values of each pixel, a calculation portion which calculates a coefficient group that allows the gradation values of each pixel generated as the reading portion reads a reference image, to be close to the gradation values of the pixels which correspond to image data forming the reference image, divides plural regions including an overlapped part in which the reference images are overlapped with each other, and calculates the coefficient group in each region, and a correction portion which corrects the gradation values of each pixel generated as the reading portion reads a correction target image, and corrects the gradation values of the correction target which correspond to the gradation values of the pixels of the overlapped part using the coefficient group.

Abstract: Provided is an image reading apparatus, including a reading portion which reads an image and generates gradation values of each pixel, a calculation portion which calculates a coefficient group that allows the gradation values of each pixel generated as the reading portion reads a reference image, to be close to the gradation values of the pixels which correspond to image data forming the reference image, divides plural regions including an overlapped part in which the reference images are overlapped with each other, and calculates the coefficient group in each region, and a correction portion which corrects the gradation values of each pixel generated as the reading portion reads a correction target image, and corrects the gradation values of the correction target which correspond to the gradation values of the pixels of the overlapped part using the coefficient group.

Abstract: Provided is an image reading apparatus including a guide plate that is movable between a first position and a second position and guides a medium at one side thereof when disposed at the first position, a retention member that is rotatable about an axis intersecting a direction in which the medium is guided, that has a first side surface and a second side surface which has a curvature greater than a curvature of the first side surface, and that retains plural color samples on the second side surface, a reading unit that reads, at a reading position, an image formed on the medium guided by the guide plate, and a rotating unit that causes the retention member to rotate such that the other side of the guide plate and the first side surface face each other and the plural color samples are moved to the reading position.

Abstract: Provided is an inspection apparatus including a first light receiving unit that receives light from an object where an image is formed based on image data with a first spectral sensitivity characteristic, a second light receiving unit that has a resolution lower than a resolution of the first light receiving unit and receives the light from the object with a second spectral sensitivity characteristic different from the first spectral sensitivity characteristic of the first light receiving unit, and an inspection unit that executes a first inspection for inspecting whether a text or a figure corresponding to the image data is present at a position on the first image and executes a second inspection for inspecting whether halftone dots are formed at a position on the second image.

Abstract: An image forming device includes an image holding member and a charging unit. In a case in which an AC current, while being increased, is supplied to the charging unit in a state in which a DC voltage value and an AC voltage value applied to the charging unit are maintained, or a case in which a DC voltage, while being increased, is supplied to the charging unit in a state in which the AC voltage value applied to the charging unit is maintained, a current detection unit detects DC current values. An inflection point derivation unit derives an inflection point of a correlation line representing an correlation between the detected DC current values and the supply amounts. An execution unit executes pre-specified processing when a characteristic value of the derived inflection point reaches a pre-specified value.

Abstract: A total layer thickness detection apparatus for a charged body includes: a saturated charge amount detection unit that detects a saturated charge amount of a charged body having plural coating layers with mutually different relative dielectric constants; a storage unit that stores relation information indicating relation of change of the saturated charge amount of the charged body with respect to a change of layer thickness of a surface layer of the charged body; and a calculation part that calculates a total layer thickness of the plural coating layers of the charged body based on the change of the saturated charge amount detected by the saturated charge amount detection unit and the relation information stored in the storage unit.

Abstract: An image forming device includes an image holding member and a charging unit. In a case in which an AC current, while being increased, is supplied to the charging unit in a state in which a DC voltage value and an AC voltage value applied to the charging unit are maintained, or a case in which a DC voltage, while being increased, is supplied to the charging unit in a state in which the AC voltage value applied to the charging unit is maintained, a current detection unit detects DC current values. An inflection point derivation unit derives an inflection point of a correlation line representing an correlation between the detected DC current values and the supply amounts. An execution unit executes pre-specified processing when a characteristic value of the derived inflection point reaches a pre-specified value.

Abstract: An image forming apparatus includes: an image carrier that rotates and carries a toner image by a surface layer disposed on a surface thereof; a charging roll that charges the surface layer while the image carrier completes one or more rotations; a power supply unit that supplies a current to the charging roll; a detector that samples and detects the current that the power supply unit outputs; a leak current detector that detects a leak current included in the current that the detector has detected; a layer thickness calculating unit that calculates a numerical value relating to the thickness of the surface layer on the basis of the current that the detector has detected; and a current leak state determining unit that determines a current leak state on the basis of the current that the detector has detected and the leak current that the leak current detector has detected.

Abstract: A charging device includes a charging member that charges a body to be charged; a detector that detects an AC component of a current flowing through the charging member; an integration section that integrates the AC component of the current detected by the detector; a controller that controls the current flowing through the charging member, according to a result of integration executed by the integration section; a periodic signal generating section that generates a periodic signal having a cycle period corresponding to a cycle period of the AC component; and an integration period adjusting section that adjusts a period of integration executed by the integration section, with reference to the periodic signal.

Abstract: A total layer thickness detection apparatus for a charged body includes: a saturated charge amount detection unit that detects a saturated charge amount of a charged body having plural coating layers with mutually different relative dielectric constants; a storage unit that stores relation information indicating relation of change of the saturated charge amount of the charged body with respect to a change of layer thickness of a surface layer of the charged body; and a calculation part that calculates a total layer thickness of the plural coating layers of the charged body based on the change of the saturated charge amount detected by the saturated charge amount detection unit and the relation information stored in the storage unit.

Abstract: An image forming apparatus, includes: an image carrier that carries a developer image by a charge layer provided on a surface of the image carrier; a charger that charges the image carrier; a feeder that feeds the charger with a charge; a total charge amount detector that detects the total amount of the charge output by the feeder; an unsupplied charge amount calculator that calculates the amount of the charge output by the feeder but not supplied to the charger; and a layer thickness calculator that calculates the thickness of the charge layer based on the unsupplied charge amount calculated by the unsupplied charge amount calculator and the total charge amount detected by the total charge amount detector.

Abstract: An image forming apparatus including a photoreceptor that rotates, a charging member provided in contact with or in close proximity of the photoreceptor to charge the photoreceptor, a charge amount detecting portion that accumulates current flowing across the photoreceptor to obtain a charge amount of the photoreceptor, while the current is being applied from the charging member until a voltage on a surface of the photoreceptor substantially corresponds to the voltage applied by the charging member, and a controller that calculates a film thickness of the photoreceptor based on the charge amount.

Abstract: A charging device includes a charging member that charges a body to be charged; a detector that detects an AC component of a current flowing through the charging member; an integration section that integrates the AC component of the current detected by the detector; a controller that controls the current flowing through the charging member, according to a result of integration executed by the integration section; a periodic signal generating section that generates a periodic signal having a cycle period corresponding to a cycle period of the AC component; and an integration period adjusting section that adjusts a period of integration executed by the integration section, with reference to the periodic signal.

Abstract: An image forming apparatus includes: an image carrier that rotates and carries a toner image by a surface layer disposed on a surface thereof; a charging roll that charges the surface layer while the image carrier completes one or more rotations; a power supply unit that supplies a current to the charging roll; a detector that samples and detects the current that the power supply unit outputs; a leak current detector that detects a leak current included in the current that the detector has detected; a layer thickness calculating unit that calculates a numerical value relating to the thickness of the surface layer on the basis of the current that the detector has detected; and a current leak state determining unit that determines a current leak state on the basis of the current that the detector has detected and the leak current that the leak current detector has detected.

Abstract: An image forming apparatus includes: a photoconductor having a photoconductive layer on an outer surface thereof; a charging portion that charges the photoconductor; a developing portion that develops a latent image formed on the photoconductor; a transfer portion that transfers a developed image; current detectors respectively provided to the charging portion, the developing portion, and the transfer portion to detect currents respectively flowing from the charging portion, the developing portion, and the transfer portion to the photoconductor; an integrating portion that calculates a charge amount by integrating the currents detected by the current detectors over a given period of time; and a layer thickness calculating portion that calculates a thickness of the photoconductive layer based on the charge amount.