An image forming system comprises a sheet supply section configured to supply a sheet for printing. The system includes a registration roller configured to guide the sheet supplied from the sheet supply section along a conveyance path. A first image forming section is configured to form a first image on the sheet based on reference image information using a first colorant type that is capable of being fixed to the sheet by heat. A fixing section is configured to heat the sheet on which the first image has been formed. A second image forming section is configured to receive the sheet from the fixing section and form a second image using a second colorant type on the sheet after the sheet has been passed through the fixing section. A controller is configured to control a heating temperature of the fixing section in two or more stages.

An image forming apparatus includes an image former configured to form an image on a recording medium, and a hardware processor, wherein the hardware processor, before the image is formed on the recording medium by the image former, determines a medium type of a subject medium that is the recording medium on which the image is to be formed by the image former, and before the medium type of the subject medium is determined, determines whether an image forming speed at which the image former forms the image is a medium speed that is predetermined with respect to the medium type of the subject medium.

An image forming apparatus includes a transferor, a first detector to detect an image formed on the transferor, a second detector to detect an image formed on a recording medium, and circuitry. The circuitry is configured to generate first gradation correction data based on a detection result obtained by the first detector, generate second gradation correction data based on a detection result obtained by the second detector, and control gradation correction for the image formed on the recording medium using the first and second gradation correction data. Further, the circuitry is configured to prioritize one of the first and second gradation correction data based on at least one of a characteristic of the recording medium and a characteristic of the image in the gradation correction during consecutive printing in which images are consecutively formed on recording media.

An image forming unit forms a black image. A motor drives the image forming unit. A control circuit controls the motor. A first connector to which the motor is connected via a control line. A second connector to which a control target is not connected. A substrate on which the control circuit, the first connector, and the second connector are arranged. A predetermined mark is formed on the substrate through silk screen printing. A distance between the predetermined mark and the second connector is shorter than a distance between the predetermined mark and the first connector. If the substrate is disposed in a multi-color image forming apparatus configured to form a color image, a control target for the multi-color image forming apparatus is connected to the second connector.

Provided is an electrophotographic photosensitive member including: a support; and a photosensitive layer, wherein the support has a surface formed of Al and/or an Al alloy, wherein the surface of the support comprises Al crystal grains having: (?) a plane at ?15? or more and less than +15? with respect to a {001} orientation; (?) a plane at ?15? or more and less than +15? with respect to a {101} orientation; and (?) a plane at ?15? or more and less than +15? with respect to a {111} orientation, and wherein the ratio of an area occupied by the Al crystal grain having the (?) is 10% or less, and the value of the ratio of an area occupied by the Al crystal grain having the (?) to an area occupied by the Al crystal grain having the (?) is more than 4/6 and less than 6/4.

A colorimetric device includes: a white reference portion having: a first irradiation area; and a second irradiation area different from the first irradiation area; a light emitter including: a first light source configured to emit visible light to the first irradiation area; and a second light source configured to emit ultraviolet light to the second irradiation area; a sensor configured to detect the visible light reflected from the first irradiation area and the ultraviolet light reflected from the second irradiation area; and a processor configured to: measure colorimetric information of an object; and calibrate the colorimetric information of the object based on the visible light and the ultraviolet light detected by the sensor.

An exposure device includes an exposure section, a weight, and an elastic portion. The exposure section includes plural light emitting elements arranged along an axial direction of an image holding member that is rotatable, is positioned with respect to the image holding member at both ends in the axial direction, and exposes the image holding member to light by emitting light to the image holding member. The weight is disposed so as to face the exposure section, and has a mass determined in advance. The elastic portion is elastic, and is disposed between the exposure section and the weight to support the weight so as to be vibratable.

An image forming apparatus includes an image forming unit, a film-shaped cylindrical body, a heating body unit, a first member, and a control unit. The image forming unit forms an image on a sheet. The cylindrical body has a sheet-passing region coming into contact with the sheet to fix the image to the sheet moving in a first direction. The cylindrical body is broader than the sheet-passing region in a second direction orthogonal to the first direction. The heating body unit includes a heating body and comes into contact with a first surface inside the cylindrical body. The first member is disposed on a second surface opposite to the first surface of the heating body. The first member has an outer end disposed outside an outer end of the sheet-passing region in the second direction. The control unit allows the heating body to generate heat inside the outer end of the sheet-passing region in the second region.

A fixing apparatus comprises a rotating body that conveys a sheet in a first direction, first and second heating sections, and first and second temperature detectors. In the first heating section, a calorific value per unit length in a second direction orthogonal to the first direction, at the center of the first heating section is larger than that at both ends thereof. In the second heating section, a calorific value per unit length in the second direction, at both ends of the second heating section is larger than that at the center thereof. The first temperature detector is configured to detect a temperature of a central part of a heating area of the rotating body heated by one of the first and second heating sections. The second temperature detector is configured to detect a temperature outside of the heating area of the rotating body.

An image forming apparatus includes an apparatus main body having a ground member, a door that pivots around a pivotal support shaft, an electric component provided on the door, and a conductive portion having first and second conductive portions. The first conductive portion is provided on the door and moves with the door. The second conductive portion is provided on the apparatus main body and is electrically connected to the first conductive portion and the ground member. The first conductive portion includes a wire spring having a contact portion that contacts the second conductive portion, and exerts an elastic force to press the second conductive portion. The contact portion is at a position overlapping the door pivotal support shaft when viewed in a direction of a pivot axis line of the door. The contact portion of the wire spring linearly extends over the pivot axis line of the door.