An image forming apparatus includes an image forming unit, an adjustment unit to select a type of adjustment processing for the image forming unit, a determination unit to determine a required time of the selected type of adjustment processing, and a display unit counting down and displaying a remaining time of the selected type of adjustment processing. The display unit controls a resolution of the remaining time based on the selected type of adjustment processing. A first type of adjustment processing is executed again if the first type of adjustment processing fails, and a second type of adjustment processing is not executed again if the second type of adjustment processing fails. The resolution includes a first resolution corresponding to the first type of adjustment processing and a second resolution corresponding to the second type of adjustment processing and being finer than the first resolution.

An image forming apparatus includes an image forming unit, an adjustment unit to select a type of adjustment processing for the image forming unit, a determination unit to determine a required time of the selected type of adjustment processing, and a display unit counting down and displaying a remaining time of the selected type of adjustment processing. The display unit controls a resolution of the remaining time based on the selected type of adjustment processing. A first type of adjustment processing is executed again if the first type of adjustment processing fails, and a second type of adjustment processing is not executed again if the second type of adjustment processing fails. The resolution includes a first resolution corresponding to the first type of adjustment processing and a second resolution corresponding to the second type of adjustment processing and being finer than the first resolution.

An image forming apparatus includes an image forming unit configured to form an image on a sheet based on image data, a control unit configured to control driving of the image forming unit, and a power supply unit configured to, if a factor for shifting from a power saving state to a standby state is detected, supply power to the image forming unit and the control unit. If a first type of factor is detected as the factor in the power saving state, the power supply unit supplies power to the control unit and the image forming unit, and the control unit restricts the driving of the image forming unit. If an instruction to perform a function of forming an image on a sheet is accepted, the control unit cancels restriction of the driving of the image forming unit.

An image forming apparatus includes an image forming unit configured to form an image on a sheet based on image data, a control unit configured to control driving of the image forming unit, and a power supply unit configured to, if a factor for shifting from a power saving state to a standby state is detected, supply power to the image forming unit and the control unit. If a first type of factor is detected as the factor in the power saving state, the power supply unit supplies power to the control unit and the image forming unit, and the control unit restricts the driving of the image forming unit. If an instruction to perform a function of forming an image on a sheet is accepted, the control unit cancels restriction of the driving of the image forming unit.

A correction method for an image forming apparatus including a light source, a photosensitive member configured to rotate in a first direction, and a deflecting unit configured to deflect light beams emitted from the light source in a second direction orthogonal to the first direction to form scanning lines, the correction method including: a first correction step of correcting sparseness and denseness of density by moving a predetermined pixel in the first direction to output a pixel value of the predetermined pixel; and a second correction step of correcting the pixel value of the predetermined pixel by, when the pixel value of the predetermined pixel moved in the second direction is equal to or less than a predetermined value, adding the pixel value to a pixel value of a subsequent pixel of the predetermined pixel in the second direction without outputting the pixel value of the predetermined pixel.

A correction method for an image forming apparatus including a light source, a photosensitive member configured to rotate in a first direction, and a deflecting unit configured to deflect light beams emitted from the light source in a second direction orthogonal to the first direction to form scanning lines, the correction method including: a first correction step of correcting sparseness and denseness of density by moving a predetermined pixel in the first direction to output a pixel value of the predetermined pixel; and a second correction step of correcting the pixel value of the predetermined pixel by, when the pixel value of the predetermined pixel moved in the second direction is equal to or less than a predetermined value, adding the pixel value to a pixel value of a subsequent pixel of the predetermined pixel in the second direction without outputting the pixel value of the predetermined pixel.

An optical sensor including an irradiation system including an irradiation system including a light source unit having a light source, the irradiation system configured to emit a linearly polarized light of a first polarization direction onto a surface of an object, a polarizing optical element disposed on an optical path of the light that is emitted from the irradiation system and reflected by diffuse reflection from an incident plane of the object and configured to separate a linearly polarized light component of a second polarization direction, a first photodetector configured to receive the linearly polarized light component of the second polarization direction separated by the polarizing optical element, and a housing supporting the irradiation system, the polarizing optical element, and the first photodetector, where the light source unit is fixed to the housing in a light emitting direction of the light source unit via space.

An optical sensor including an irradiation system including an irradiation system including a light source unit having a light source, the irradiation system configured to emit a linearly polarized light of a first polarization direction onto a surface of an object, a polarizing optical element disposed on an optical path of the light that is emitted from the irradiation system and reflected by diffuse reflection from an incident plane of the object and configured to separate a linearly polarized light component of a second polarization direction, a first photodetector configured to receive the linearly polarized light component of the second polarization direction separated by the polarizing optical element, and a housing supporting the irradiation system, the polarizing optical element, and the first photodetector, where the light source unit is fixed to the housing in a light emitting direction of the light source unit via space.

A sheet conveyance apparatus includes a conveyance roller, a first rotary member forming a first nip portion conveying a sheet in a first conveyance direction, a rotation axis of the first rotary member being inclined with respect to a rotation axis of the conveyance roller such that a center of one end of the first rotary member is positioned at a different position in the first conveyance direction with respect to a center of the other end, and a second rotary member forming a second nip portion conveying a sheet in a second conveyance direction, a rotation axis of the second rotary member being inclined with respect to the rotation axis of the conveyance roller such that a center of one end of the second rotary member is positioned at a different position in the second conveyance direction with respect to a center of the other end.

A sheet conveyance apparatus includes a conveyance roller, a first rotary member forming a first nip portion conveying a sheet in a first conveyance direction, a rotation axis of the first rotary member being inclined with respect to a rotation axis of the conveyance roller such that a center of one end of the first rotary member is positioned at a different position in the first conveyance direction with respect to a center of the other end, and a second rotary member forming a second nip portion conveying a sheet in a second conveyance direction, a rotation axis of the second rotary member being inclined with respect to the rotation axis of the conveyance roller such that a center of one end of the second rotary member is positioned at a different position in the second conveyance direction with respect to a center of the other end.