An exposure apparatus for exposing a photosensitive member includes: a first chip that includes a plurality of first light-emitting portions arranged along an axial direction of the photosensitive member; a second chip, arranged at a different position from the first chip in the axial direction, that includes a plurality of second light-emitting portions arranged along the axial direction; and a control unit configured to output image data that is a set of binary bits each indicating a first or second value. A first part and a second part of the image data are output to the first and second chips, respectively. The control unit is configured to control a driving current supplied in each of the first and second chips based on a counted number of bits indicating the first value in the corresponding part of the image data.

An image forming apparatus includes an attachment portion to which any one of a first fixing apparatus and a second fixing apparatus is selectively attached, and a power supply circuit including a plurality of power supply paths. The first fixing apparatus includes a plurality of first heating elements grouped into a plurality of groups, and a number of the plurality of groups is equal to a number of the plurality of power supply paths. The second fixing apparatus includes at least one second heating element grouped into at least one group whose number is smaller than the number of the power supply paths. In a state where the second fixing apparatus is attached to the image forming apparatus, a power supply path of the plurality of power supply paths in which a power line has a largest allowable current value is electrically connected with the second heating element.

An image forming apparatus includes: an output unit configured to receive light reflected from a measurement image on an image carrier and output a signal corresponding to a light receiving result; a detection unit configured to detect a temperature of the output unit; a conversion unit configured to convert an output value output from the output unit, based on a conversion condition; a controller configured to control an image forming condition for adjusting a density of an image to be formed based on a converted output value by the conversion unit; and a generation unit configured to, at a predetermined timing, acquire an output value output from the output unit without emitting light, control the detection unit to detect the temperature, and generate the conversion condition based on the acquired output value and the detected temperature.

An image forming apparatus comprises one or more controllers, a display, a detachable fixing unit, and a temperature measurer that measures a temperature of the fixing unit or in the vicinity thereof, wherein the one or more controllers display, on the display, prediction information related to finishing of a cooling operation of cooling the mounted fixing unit, based on a measurement result by the temperature measurer.

An image forming apparatus, comprises: a first control unit which performs control of a load by outputting a pulse signal based on a clock signal output by a first oscillator; and a second control unit which is connected to the first control unit by a serial communication signal line, and performs control of a load by outputting a pulse signal based on a clock signal output by a second oscillator, wherein the second control unit measures a width of the pulse signal output from the first control unit via the serial communication signal line; compares a pulse signal width designated by an adjustment request with the measured width of the pulse signal; and corrects, based on a result of the comparing, the width of the pulse signal that is based on the clock signal output by the second oscillator.

The image forming apparatus is an image forming apparatus for forming an image on a recording material using an electrophotographic process, and includes a transfer section that transfers a toner image on an image bearing member onto a transfer-receiving member; and a hardware processor (transfer voltage controller) that controls a transfer voltage to be applied to the transfer section by correcting a reference transfer voltage with a correction amount that is based on an environmental change, wherein, the correction amount depends on at least the transfer voltage, and the hardware processor determines the correction amount for determining the transfer voltage for a current transfer by referring to the transfer voltage for an immediately preceding transfer.

In an image forming system including an apparatus main-body and a control portion which controls a fixing operation, to the apparatus main-body, a first fixing unit including a first heater and a second fixing unit including a second heater, which is different from the first heater, can be selectively attached, and each of the first and second fixing units has an information processing portion which transmits data including identification information and temperature information related to a temperature detected by a temperature detection element to the control portion, and the control portion discriminates which of the first fixing unit and the second fixing unit, the fixing unit attached to the apparatus main-body is on the basis of the identification information from the information processing portion and controls the fixing operation by the fixing unit on the basis of the temperature information.

An image forming apparatus includes: an output unit configured to receive light reflected from a measurement image on an image carrier and output a signal corresponding to a light receiving result; a detection unit configured to detect a temperature of the output unit; a conversion unit configured to convert an output value output from the output unit, based on a conversion condition; a controller configured to control an image forming condition for adjusting a density of an image to be formed based on a converted output value by the conversion unit; and a generation unit configured to, at a predetermined timing, acquire an output value output from the output unit without emitting light, control the detection unit to detect the temperature, and generate the conversion condition based on the acquired output value and the detected temperature.

According to an embodiment, an image forming apparatus includes an image forming device, a scanning device, and a controller. The image forming device forms a first test image and forms a second test image. The scanning device scans the first test image with a first amount of emitted light corresponding to a first input value and scans the second test image with a second amount of emitted light corresponding to a second input value. The controller selectively executes any one of a first correction process, a second correction process, or a third correction process on the basis of an event change.

A fixing device includes a heater, a holding member, and a pressure member. The heater heats a fixing belt. The holding member holds the heater such that the front surface of the heater is in contact with the inner peripheral surface of the fixing belt. The pressure member is pressed by the heater with the fixing belt interposed therebetween. The holding member includes a concave portion for accommodating the heater, a seating surface that is in contact with the back surface of the heater is formed in the concave portion, and the seating surface is formed such that an area of a contact surface with the heater in a circumferential direction of the fixing belt is narrower or wider at a location than at another location in a width direction that intersects the circumferential direction.