Abstract: An image forming device includes a first detection sensor unit that detects a toner image formed on an image carrier; a second detection sensor unit that detects the toner image disposed to be separated in the main scanning direction with respect to the first detection sensor unit and formed on the image carrier; and a controller. The controller causes: an image carrier to carry toner images indicating a first test pattern and a second test pattern, and discriminate a difference from a determination condition with respect to a first determination result based on a first threshold value and a second determination result. The controller determines a component to be an occurrence cause of the difference based on a combination of the first determination result and the second determination result when it is determined that the difference is present.

Abstract: An image forming apparatus of an embodiment comprises a printer unit to print a sheet with a plurality of single colors and generate a correction sheet including a plurality of single color regions at different positions between a first reference region and a second reference region. The first and second reference regions are a reference color. An image reading unit is configured to read the correction sheet. A processor is configured to calculate a shift amount in a main scanning direction of the printer unit for each single color region based on RGB luminance values obtained from the correction sheet by the image reading unit and to correct a printer scan position along the main scanning direction for each single color in the plurality of single colors corresponding to the single color regions using calculated shift amounts.

Abstract: An image forming apparatus includes a photoconductive body, a light source, a lens, a light housing, a first fulcrum, a second fulcrum, a stay, and a repositioning mechanism. The lens is positioned to focus light emitted from the light source at a focal position. The light housing holds the light source and the lens. The fulcrums are positioned such that a surface of the photoconductive body is positioned at the focal position when the light housing engages the first fulcrum and the second fulcrum. The stay is positioned to support the light housing at two or more points between the fulcrums. The repositioning mechanism is coupled to the stay. The light housing presses against the fulcrums when the repositioning mechanism is in a first orientation and is spaced from the fulcrums when the repositioning mechanism is in a second orientation.

Abstract: An image forming apparatus includes a photoconductive body, a light source, a lens, a light housing, a first fulcrum, a second fulcrum, a stay, and a repositioning mechanism. The lens is positioned to focus light emitted from the light source at a focal position. The light housing holds the light source and the lens. The fulcrums are positioned such that a surface of the photoconductive body is positioned at the focal position when the light housing engages the first fulcrum and the second fulcrum. The stay is positioned to support the light housing at two or more points between the fulcrums. The repositioning mechanism is coupled to the stay. The light housing presses against the fulcrums when the repositioning mechanism is in a first configuration and is spaced from the fulcrums when the repositioning mechanism is in a second configuration.

Abstract: An image forming apparatus of an embodiment comprises a printer unit to print a sheet with a plurality of single colors and generate a correction sheet including a plurality of single color regions at different positions between a first reference region and a second reference region. The first and second reference regions are a reference color. An image reading unit is configured to read the correction sheet. A processor is configured to calculate a shift amount in a main scanning direction of the printer unit for each single color region based on RGB luminance values obtained from the correction sheet by the image reading unit and to correct a printer scan position along the main scanning direction for each single color in the plurality of single colors corresponding to the single color regions using calculated shift amounts.

Abstract: An image forming apparatus of an embodiment comprises a printer unit to print a sheet with a plurality of single colors and generate a correction sheet including a plurality of single color regions at different positions between a first reference region and a second reference region. The first and second reference regions are a reference color. An image reading unit is configured to read the correction sheet. A processor is configured to calculate a shift amount in a main scanning direction of the printer unit for each single color region based on RGB luminance values obtained from the correction sheet by the image reading unit and to correct a printer scan position along the main scanning direction for each single color in the plurality of single colors corresponding to the single color regions using calculated shift amounts.

Abstract: An image forming apparatus includes a first temperature sensor inside the image forming apparatus and configured to detect a temperature. A controller is configured to execute a first position shift correction for each of a plurality of toner images used in printing an image when the first temperature sensor detects a change in temperature from a previously detected temperature exceeds a first threshold value set for a first temperature range. After the first position shift correction, the controller executes a second position shift correction if the detected change exceeds a second threshold value set for a second temperature range higher than the first temperature range and the temperature is outside a prescribed temperature range, and skips the second position shift correction otherwise.

Abstract: An image forming apparatus of an embodiment comprises a printer unit to print a sheet with a plurality of single colors and generate a correction sheet including a plurality of single color regions at different positions between a first reference region and a second reference region. The first and second reference regions are a reference color. An image reading unit is configured to read the correction sheet. A processor is configured to calculate a shift amount in a main scanning direction of the printer unit for each single color region based on RGB luminance values obtained from the correction sheet by the image reading unit and to correct a printer scan position along the main scanning direction for each single color in the plurality of single colors corresponding to the single color regions using calculated shift amounts.

Abstract: In accordance with an embodiment, an image forming apparatus includes a first supporting unit and a second supporting unit, a first drive source, and a first and a second transmission unit. The first drive source is configured to provide a first drive force in a first direction and a second drive force in a second direction. When the first drive source provides the first drive force, the first transmission unit allows the first supporting unit to move by transmission of the first drive force and allows the second supporting unit to be in a stopped state by non-transmission of the first drive force. When the first drive source provides the second drive force, the second transmission unit allows the second supporting unit to move by transmission of the second drive force and allows the first supporting unit to be in a stopped state by non-transmission of the second drive force.

Abstract: A first supporting unit configured to movably support, in a direction intersecting with A length direction of A first reflecting mirror, an end of the first reflecting mirror in the length direction of the first reflecting mirror; a second supporting unit configured to movably support, in a direction intersecting with the length direction of a second reflecting mirror, an end of the second reflecting mirror in the length direction of the second reflecting mirror; a first drive source; a first transmission unit configured to transmit, when the first drive source provides a drive source in a first direction, the movement of the first drive source to a first supporting unit; and a second transmission unit configured to transmit, when the first drive source provides a drive source in a second direction, a movement of a second drive source to the second supporting unit.

Abstract: In accordance with an embodiment, an image forming apparatus includes a first supporting unit and a second supporting unit, a first drive source, and a first and a second transmission unit. The first drive source is configured to provide a first drive force in a first direction and a second drive force in a second direction. When the first drive source provides the first drive force, the first transmission unit allows the first supporting unit to move by transmission of the first drive force and allows the second supporting unit to be in a stopped state by non-transmission of the first drive force. When the first drive source provides the second drive force, the second transmission unit allows the second supporting unit to move by transmission of the second drive force and allows the first supporting unit to be in a stopped state by non-transmission of the second drive force.

Abstract: According to an embodiment, an exposure device has first and second eccentric cams. The first eccentric cam has an eccentric shape that supports a first mirror support point located near the center on one end side in a longitudinal direction of a mirror and varies a distance between a first rotary shaft and the first mirror support point in correspondence to rotation around the first rotary shaft. The second eccentric cam has an eccentric shape that supports a second mirror support point of two support points located on the other end side in the longitudinal direction of the mirror and varies a distance between a rotary shaft and the second mirror support point in correspondence to rotation around the rotary shaft.

Abstract: According to an embodiment, an exposure device has first and second eccentric cams. The first eccentric cam has an eccentric shape that supports a first mirror support point located near the center on one end side in a longitudinal direction of a mirror and varies a distance between a first rotary shaft and the first mirror support point in correspondence to rotation around the first rotary shaft. The second eccentric cam has an eccentric shape that supports a second mirror support point of two support points located on the other end side in the longitudinal direction of the mirror and varies a distance between a rotary shaft and the second mirror support point in correspondence to rotation around the rotary shaft.

Abstract: According to one embodiment, an image forming apparatus includes a photoconductive drum, a line-type LED exposing unit disposed to be opposed to the photoconductive drum, an exposing unit supporting tray configured to support the LED exposing unit to be capable of approaching and separating from the photoconductive drum in a radial direction of the photoconductive drum, an extending piece being formed in a part of an end of the exposing unit supporting tray, and a rod member disposed in parallel to the major axis direction of the LED exposing unit and moved in the major axis direction to thereby cause the LED exposing unit to approach and separate from the photoconductive drum in the radial direction of the photoconductive drum via the extending piece of the exposing unit supporting tray.

Abstract: According to one embodiment, an optical scanning device includes plural light sources, a polygon mirror, a first lens, a first reflection mirror, and a second lens. The polygon mirror deflects lights emitted from the plural light sources in a predetermined direction. The first lens allows the lights emitted from the plural light sources and deflected by the polygon mirror to pass. The first reflection mirror reflects the lights passed through the first lens in a direction different from the deflecting direction of the polygon mirror. The second lens receives incidence of the lights reflected by the first reflection mirror from a direction different from an incident direction of the first lens and allows, with one lens, the lights emitted from the plural light sources to pass.

Abstract: According to one embodiment, an image forming apparatus includes a photoconductive drum, a line-type LED exposing unit disposed to be opposed to the photoconductive drum, an exposing unit supporting tray configured to support the LED exposing unit to be capable of approaching and separating from the photoconductive drum in a radial direction of the photoconductive drum, an extending piece being formed in a part of an end of the exposing unit supporting tray, and a rod member disposed in parallel to the major axis direction of the LED exposing unit and moved in the major axis direction to thereby cause the LED exposing unit to approach and separate from the photoconductive drum in the radial direction of the photoconductive drum via the extending piece of the exposing unit supporting tray.

Abstract: According to one embodiment, an optical scanning device includes plural light sources, a polygon mirror, a first lens, a first reflection mirror, and a second lens. The polygon mirror deflects lights emitted from the plural light sources in a predetermined direction. The first lens allows the lights emitted from the plural light sources and deflected by the polygon mirror to pass. The first reflection mirror reflects the lights passed through the first lens in a direction different from the deflecting direction of the polygon mirror. The second lens receives incidence of the lights reflected by the first reflection mirror from a direction different from an incident direction of the first lens and allows, with one lens, the lights emitted from the plural light sources to pass.

Abstract: An optical scanning device of an embodiment includes: a deflection unit which deflects a light beam emitted from a light source, in a main scanning direction; a reflection mirror which reflects the light beam from the deflection unit toward an image carrier; a supporting member which supports each of two ends of the reflection mirror; a plate situated on a back side that is opposite to an incident surface for the light beam, of the reflection mirror, along the axial line of the reflection mirror; a holding unit which holds an end of the incident surface with an end of the plate from the back side of the reflection mirror; and a pressing member which presses the back side of the reflection mirror in a curvature correcting direction against the plate.

Abstract: A light source, a polygon mirror mechanism, a deflection lens, and a mirror unit are housed in a casing. The mirror unit includes a base member of metal fixed to the casing and a mirror supporting plate attached to the base member. The mirror supporting plate is formed by a metal flat plate and includes a mirror supporting section. A holder member is attached to the mirror supporting section. An end of the mirror is held in the holder member by a spring member. The holder member is rotatable around an axis of the mirror. When the holder member is rotated, an angle of the mirror changes. After the angle of the mirror is adjusted, the holder member is fixed to the mirror supporting section by a fixing member.

Abstract: A light source, a polygon mirror mechanism, a deflection lens, and a mirror unit are housed in a casing. The mirror unit includes a base member of metal fixed to the casing and a mirror supporting plate attached to the base member. The mirror supporting plate is formed by a metal flat plate and includes a mirror supporting section. A holder member is attached to the mirror supporting section. An end of the mirror is held in the holder member by a spring member. The holder member is rotatable around an axis of the mirror. When the holder member is rotated, an angle of the mirror changes. After the angle of the mirror is adjusted, the holder member is fixed to the mirror supporting section by a fixing member.