An image forming apparatus includes an image forming device, a corrector, and a controller. The image forming device is configured to form an image on a sheet using a rotating body under a predetermined image forming condition. The corrector is configured to correct the image forming condition to adjust image density unevenness corresponding to a rotation cycle of the rotating body. The controller is configured to control the image forming device to form on at least one sheet (i) plural test images that are different in correction amount for the image forming condition and (ii) pointing portions indicating intervals corresponding to the rotation cycle of the rotating body, in a state where the rotating body is continuously rotated.

An image forming apparatus includes an image forming device, a corrector, and a controller. The image forming device is configured to form an image on a sheet using a rotating body under a predetermined image forming condition. The corrector is configured to correct the image forming condition to adjust image density unevenness corresponding to a rotation cycle of the rotating body. The controller is configured to control the image forming device to form on at least one sheet (i) plural test images that are different in correction amount for the image forming condition and (ii) pointing portions indicating intervals corresponding to the rotation cycle of the rotating body, in a state where the rotating body is continuously rotated.

An image forming apparatus includes a storage unit and a charging amount acquisition unit. The charging amount acquisition unit performs a charging amount acquisition operation for forming a measurement toner image on the image carrier while changing the frequency of the alternating current voltage of the development bias with a potential difference in a direct current voltage between the developing roller and the image carrier being kept constant, acquiring a tilt of a measurement straight line representing a relationship between the change amount of the frequency and a density change amount of the measurement toner image, and acquiring the charging amount of the toner based on the acquired tilt of the measurement straight line and the reference information in the storage unit.

In the first charge amount acquisition operation, based on density of a plurality of toner images for measurement or based on a direct component of a developing current at the time of forming the plurality of toner images in addition to the density of the plurality of toner images for measurement, the charge amount acquisition section acquires a first toner charge amount that is a charge amount of toner included in the toner image for measurement. In the second charge amount acquisition operation, based on the toner density detected at the time of image formation and a relationship between the first toner charge amount and the toner density detected in the first charge amount acquisition operation, the charge amount acquisition section acquires a second toner charge amount that is a charge amount of the toner in the development device.

In the first charge amount acquisition operation, based on density of a plurality of toner images for measurement or based on a direct component of a developing current at the time of forming the plurality of toner images in addition to the density of the plurality of toner images for measurement, the charge amount acquisition section acquires a first toner charge amount that is a charge amount of toner included in the toner image for measurement. In the second charge amount acquisition operation, based on the toner density detected at the time of image formation and a relationship between the first toner charge amount and the toner density detected in the first charge amount acquisition operation, the charge amount acquisition section acquires a second toner charge amount that is a charge amount of the toner in the development device.

An image forming apparatus includes a storage unit and a charging amount acquisition unit. The charging amount acquisition unit performs a charging amount acquisition operation for forming a measurement toner image on the image carrier while changing the frequency of the alternating current voltage of the development bias with a potential difference in a direct current voltage between the developing roller and the image carrier being kept constant, acquiring a tilt of a measurement straight line representing a relationship between the change amount of the frequency and a density change amount of the measurement toner image, and acquiring the charging amount of the toner based on the acquired tilt of the measurement straight line and the reference information in the storage unit.

An image formation apparatus includes a printer configured to perform a printing process including transporting a recording medium and printing an image on the transported recording medium, and a hardware processor which determines whether the recording medium is only one sheet to be printed, and, depending on a result thereof, changes a time at which the printing process is started. Changing the time includes causing the printer to start the printing process when a first start print time is reached in a case in which the hardware processor determines that there is only one sheet to be printed, and causing the printer to start the printing process when a second start print time later than the first start print time is reached in a case in which the hardware processor determines that there is not only one sheet to be printed.

An image formation apparatus includes a printer configured to perform a printing process including transporting a recording medium and printing an image on the transported recording medium, and a hardware processor which determines whether the recording medium is only one sheet to be printed, and, depending on a result thereof, changes a time at which the printing process is started. Changing the time includes causing the printer to start the printing process when a first start print time is reached in a case in which the hardware processor determines that there is only one sheet to be printed, and causing the printer to start the printing process when a second start print time later than the first start print time is reached in a case in which the hardware processor determines that there is not only one sheet to be printed.

Disclosed is an image forming apparatus configured to form an image on a sheet including an image forming unit configured to expose a photosensitive member with laser light, while the photosensitive member is rotating, to form an electrostatic latent image to develop the electrostatic latent image formed on the photosensitive member, a sensor configured to detect a pattern image formed by the image forming unit, and a controller configured to suppress density unevenness in a rotation direction of the photosensitive member of an image to be formed by the image forming unit, based on detection results which are obtained by the sensor and correspond to different positions of the pattern image in the rotation direction.

The present disclosure provides a storage apparatus, a process cartridge and a connection apparatus. The process cartridge includes a cartridge body; a photosensitive drum, rotatably installed at the cartridge body, where the photosensitive drum is configured with an image-forming region capable of generating an electrostatic latent image; a potential detection part, configured to detect an electrical signal on the image-forming region; a storage apparatus, where the storage apparatus includes an electrical contact configured to be electrically connected to an electrical contact portion disposed on the image-forming apparatus main body; and a first electrical connection part, where the first electrical connection part includes a transmission terminal; and the transmission terminal is electrically connected to the electrical detection part and configured to be electrically connected to the electrical contact portion.