An image forming apparatus includes: an image forming unit configured to form an image on an image bearing member based on an image forming condition, an optical sensor including: a light emitter configured to irradiate the image bearing member with light based on a supplied current; and a light receiver configured to receive reflected light of the light emitted from the light emitter; a temperature detector configured to detect a temperature of the optical sensor; and a controller configured to: control the image forming unit to form a detection image on the image bearing member; control the optical sensor to detect reflected light from the detection image; and adjust the image forming condition based on a result of detecting the detection image by the optical sensor. The controller is configured to control the light emitter to emit light; and generate a correction condition.

An image forming apparatus includes an image forming unit configured to form an image on a sheet based on image forming condition, a reader configured to convey the sheet and read a test image on the sheet while the sheet is conveyed, and a controller configured to control the image forming unit to form the image and the test image on a same sheet, control the reader to read the test image on the same sheet, and generate the image forming condition for adjusting a density of an image to be formed by the image forming unit, based on a reading result of the test image by the reader.

An image forming apparatus includes an image forming unit includes a photosensitive member; a charging unit configured to uniformly charge the photosensitive member; an exposure unit configured to form an electrostatic latent image on the photosensitive member by scanning the charged photosensitive member with laser light; and a developing device configured to develop the electrostatic latent image to form an image on the photosensitive member, a reading unit configured to read a test image, which is formed by the image forming unit, for detecting image density of the image, and a controller configured to: control the image forming unit to form the test image; detect periodic fluctuation of the image density based on a detection result of the test image which is acquired by controlling the reading unit to read the test image; and correct an image forming condition to suppress the detected fluctuation.

A method of printing a toner, including: rotating a cylinder having a printing plate with a fixed pattern; transferring a toner from a vessel onto the fixed pattern of the printing plate, in which the toner includes a pigment with a metallic reflective layer; and transferring the toner onto a substrate; in which the fixed pattern defines select portions of an image; and in which the toner correlates to the selected portions of the image is disclosed.

An image forming apparatus includes an image processor configured to convert image data based on a first conversion condition; an image forming unit configured to form an image on a sheet based on the image data converted by the image processor, the image forming unit having an image bearing member on which the image is to be formed, a transfer unit configured to transfer the image from the image bearing member onto the sheet, and a fixing unit configured to fix the image to the sheet; a conveyance roller configured to convey the sheet having the image fixed thereto; a reading unit configured to read a pattern image on the sheet conveyed by the conveyance roller; and a detector configured to detect a pattern image on the image bearing member.

An optical sensor comprises a first light-emitting element, a second light-emitting element, a light-receiving element, a first amplifier circuit and a second amplifier circuit. The light-receiving element receives reflected light from an object to be measured, and outputs an output value on the basis of a light receiving result of the light-receiving element. The amplifier circuits amplifies the output value output from the light-receiving element.

An image forming apparatus includes: an image forming unit comprising: a photosensitive member configured to rotate; a charging unit configured to charge the photosensitive member based on a charging bias; an exposure unit configured to expose the photosensitive member charged by the charging unit with laser light to form an electrostatic latent image on the photosensitive member; and a developing device configured to develop the electrostatic latent image based on a development bias to form an image on the photosensitive member, a reading unit configured to read a test image formed by the image forming unit, and a controller configured to: control the image forming unit to form the test image; control the reading unit to read the test image.

An image forming system generates second image data representing a result of a reading unit reading an image on a sheet, corrects the second image data using correction data, the correction data being data obtained on the basis of image data obtained by the reading unit reading a predetermined image formed on the sheet by an image forming unit and image data corresponding to the predetermined image, and inspects, on the basis of the corrected second image data and a first image data, an image formed on the sheet on the basis of the first image data.

An image forming apparatus is configured to control a generation circuit to modulate a DC component of a developing voltage based on a first correction component such that a density unevenness is reduced. The image forming apparatus is further configured to restrict the first correction component for modulating the DC component of the developing voltage such that fogging of toner that may occur on a non-exposure region which is not exposed by an exposure unit and adhesion to a photosensitive member of carrier included in a developer are reduced.

To provide an image forming device that can be efficiently maintained. According to one embodiment, the image forming device includes a plurality of photoconductors, an exposure device, a developer, and a processor. The exposure device irradiates a corresponding surface of the plurality of photoconductors with light corresponding to an image formed on a corresponding photoconductor of the plurality of photoconductors. The developer supplies a toner to the corresponding surface of the plurality of photoconductors on which an electrostatic latent image is formed by the light emitted by the exposure device. The processor adjusts, for every photoconductor, a contrast potential for supplying the toner from the developer to the electrostatic latent image formed on the corresponding surface of the plurality of photoconductors, and notifies a warning when there is a contrast potential whose difference from another contrast potential exceeds a reference value.