An image forming apparatus includes a developing roller, a motor, a motor control portion configured to control the motor, a drive switching unit configured to switch between transmission and non-transmission of the rotational driving force of the motor relative to the developing roller, a current detection portion configured to detect a current value of a current to the motor, and an acquisition unit configured to acquire information relating to a rotation amount of the developing roller. The acquisition unit is configured to acquire the information relating to the rotation amount of the developing roller on the basis of a transmission timing at which the rotational driving force is allowed to be transmitted to the developing roller by the drive switching unit and a non-transmission timing at which the rotational driving force is prevented from being transmitting to the developing roller by the drive switching unit.

An image forming apparatus includes an image carrier, a charger, a developing member, a motor, a drive controller, and an application controller. The image carrier is rotatably provided. The charger charges the image carrier to a predetermined first polarity by receiving application of a voltage of the first polarity. The developing member develops an electrostatic latent image formed on the image carrier using the toner charged to the first polarity. The motor rotates the image carrier. The drive controller executes stop control for stopping driving of the motor. The application controller stops voltage application to the charger based on a current flowing through the motor after execution of the stop control.

Provided is an image forming apparatus, including: an image bearing member; an exposure unit; a developing member which is rotatable at a rotation speed different from the image bearing member; a developer supply member; a developing voltage-applying unit; a supply voltage-applying unit; and a control unit. The control unit controls execution of: an image forming operation in which a developer image is formed by supplying developer on the image bearing member; and a cleaning operation which removes a substance adhered to the image bearing member using the developing member. In the cleaning operation, the control unit controls the developing voltage-applying unit or the supply voltage-applying unit so that the cleaning force using the developing member becomes stronger than that in the image forming operation.

An image forming apparatus includes a photosensitive member, a developing member to supply a toner to the photosensitive member at a developing portion, a transfer member to transfer a toner image to a recording material passing through a transfer portion from the photosensitive member. In a case which the transfer is performed to a smaller width recording material and thereafter, the transfer is successively performed to a larger width recording material, a control portion controls a first back contrast formed when an area of a surface of the photosensitive member corresponding to the transfer portion through which the smaller width recording material is passing reaches the developing portion, and a second back contrast formed when an area of the surface corresponding to the transfer portion through which the larger width recording material is passing reaches the developing portion so that the second back contrast is larger than the first back contrast.

A motor control apparatus excites an excitation phase targeted for excitation among a plurality of excitation phases of a motor. The motor control apparatus, in a state in which a rotor of the motor is stopped, excites an excitation phase corresponding to a stop position of the rotor among the plurality of the excitation phases, and measures a physical quantity which changes in accordance with an inductance of at least one of a plurality of coils configuring the plurality of excitation phases. The motor control apparatus estimates a temperature of the rotor from a measurement value of the measured physical quantity, and decides a parameter value for control of the motor based on the estimated temperature.

An image forming apparatus includes a rotatable photosensitive member; a charging portion, an exposure portion, a developing member, a transfer unit, a contact and separation portion, a charging voltage applying portion, a detecting portion, and a controller. The controller is capable of executing an operation in an image forming mode and an operation in a detecting mode. The controller carries out control so that a charging current flowing through a charging portion during charging of the photosensitive member in the operation in the detecting mode is lower than a charging current flowing through the charging portion during charging of the photosensitive member in the operation in the image forming mode.

An image forming apparatus includes an image bearer, a developing device, a fixing device, and circuitry. The developing device contains a developer and develops a latent image on the image bearer with the developer. The developing device includes a stirrer to stir the developer. The fixing device fixes a toner image onto a sheet. The circuitry performs start-up operations after receiving a print start command and before starting a printing operation. The start-up operations includes starting a warm-up operation of the fixing device and starting, during the warm-up operation, a stirring operation in which the stirrer stirs the developer.

An image forming apparatus includes a CPU configured to change a parameter value used to control a developer bearing amount and form a plurality of patches for different parameter values changed, and a color sensor configured to measure the plurality of patches thereby acquiring color information thereof. The CPU detects, from values of color information of the plurality of patches, a value of the color information at which a change greater than or equal to a predetermined threshold value occurs, and the CPU sets a parameter used in forming an image based on the detected value of color information.

There is provided an image forming apparatus and method, in which performed are reading an image of an original document, converting a read image to raster data, raising a temperature of a fixing device to a fixing temperature, after raising the temperature of the fixing device, recording an image on the sheet on a sheet and causing the fixing device to fix the developing agent image onto the sheet. When a preview setting is enabled, after performing the converting, the preview image is displayed on the display and the raising is performed after the displaying and in response to an execution instruction of the forming. When the preview setting is not enabled, after performing a pre-heating of the fixing device so that the temperature of the fixing device is lower than the fixing temperature, performing the raising without displaying the preview image.

A recording device includes a recording unit configured to record a plurality of types of recording materials on a medium, and a control unit configured to control recording by the recording unit. When performing recording on the medium in accordance with recording data for recording a plurality of types of recording materials in a same region on the medium, the control unit identifies a first recording material with a relatively high recording density in the same region, and a second recording material with a lower recording density in the same region than that of the first recording material, based on recording data, and the control unit performs recording such that a second region in which recording is performed with the second recording material corresponding to the same region is smaller than a first region in which recording is performed with the first recording material corresponding to the same region.