Abstract: A controller which causes a light emitting element to continuously perform minute emission for a plurality of dots in a level in which toner is not attached to a non-image section on an image bearing member is provided. The controller controls a first driving current for an image section and controls a second driving current used to perform the minute emission by the light emitting element in the non-image section several times in one job. In the image section, a driving current obtained by adding the first driving current to the second driving current is supplied so that the light emitting element emits light.

Abstract: A controller which causes a light emitting element to continuously perform minute emission for a plurality of dots in a level in which toner is not attached to a non-image section on an image bearing member is provided. The controller controls a first driving current for an image section and controls a second driving current used to perform the minute emission by the light emitting element in the non-image section several times in one job. In the image section, a driving current obtained by adding the first driving current to the second driving current is supplied so that the light emitting element emits light.

Abstract: A controller which causes a light emitting element to continuously perform minute emission for a plurality of dots in a level in which toner is not attached to a non-image section on an image bearing member is provided. The controller controls a first driving current for an image section and controls a second driving current used to perform the minute emission by the light emitting element in the non-image section several times in one job. In the image section, a driving current obtained by adding the first driving current to the second driving current is supplied so that the light emitting element emits light.

Abstract: A controller which causes a light emitting element to continuously perform minute emission for a plurality of dots in a level in which toner is not attached to a non-image section on an image bearing member is provided. The controller controls a first driving current for an image section and controls a second driving current used to perform the minute emission by the light emitting element in the non-image section several times in one job. In the image section, a driving current obtained by adding the first driving current to the second driving current is supplied so that the light emitting element emits light.

Abstract: A driving unit causes first and second light emitting units each to emit light in a time following a pulse duty with a light amount at a first light emission level for printing on an image portion in an image formable region of a photosensitive member according to input of print data, and causes the first and the second light emitting units each to emit light with a light amount at a second light emission level of weak light emission on a non-image portion in the image formable region of the photosensitive member, and an adjustment unit adjusts each of first, second, third, and fourth driving currents for a plurality of times in one job.

Abstract: In a color image forming apparatus, the amount of light of an exposure unit for a weak exposure is changed according to a remaining service life of a photosensitive drum when the weak exposure is performed for the background area of a corresponding photosensitive drum by using the exposure unit.

Abstract: A color image forming apparatus has a light emitting element emitting light, a laser driving unit causing the light emitting element to emit light of a light amount at a first emission level for visualizing a toner image onto a first area where the toner image is to be visualized on a charged photosensitive member and to emit light of a light amount at a second emission level for weak emission onto a second area where the toner is not to be adhered to the charged photosensitive member. In addition, an acquiring unit acquires information of an integrated number of rotations of the photosensitive member, a drive current adjusting unit adjusts the drive current for the second emission level, and changes a magnitude of the drive current for the second emission level in accordance with the information of the integrated number of rotations of the photosensitive member.

Abstract: The image forming apparatus includes a photosensitive drum and a light emitting device. In the rotational axis direction of the photosensitive drum, the width of the weak light exposure region on the photosensitive drum in which an exposing device emits weak light is larger than the width of a region corresponding to the width of a recording medium on which an image is formed, but smaller than the width of a region on the photosensitive drum charged by a charging roller.

Abstract: A light irradiating device causes a light source to emit light with normal emitted light quantity sufficient for adhering toner on a photosensitive member, on an image portion of the photosensitive member, and causes the light source to emit light with minute emitted light quantity sufficient for preventing toner from being adhered on the photosensitive member, which is smaller than normal emitted light quantity. The light irradiating device includes a determining unit to determine a reference value input to the light irradiating device. Minute emitted light quantity is set based on the reference value input to the light irradiating device. The determining unit determines the reference value to be input to the light irradiating device based on information of relationship between a predetermined reference value and the light quantity in the position of the photosensitive member when causing the light source to emit light, based on the predetermined reference value.

Abstract: A light irradiating device causes a light source to emit light with normal emitted light quantity sufficient for adhering toner on a photosensitive member, on an image portion of the photosensitive member, and causes the light source to emit light with minute emitted light quantity sufficient for preventing toner from being adhered on the photosensitive member, which is smaller than normal emitted light quantity. The light irradiating device includes a determining unit to determine a reference value input to the light irradiating device. Minute emitted light quantity is set based on the reference value input to the light irradiating device. The determining unit determines the reference value to be input to the light irradiating device based on information of relationship between a predetermined reference value and the light quantity in the position of the photosensitive member when causing the light source to emit light, based on the predetermined reference value.

Abstract: In a color image forming apparatus, the amount of light of an exposure unit for a weak exposure is changed according to a remaining service life of a photosensitive drum when the weak exposure is performed for the background area of a corresponding photosensitive drum by using the exposure unit.

Abstract: Provided is a color image forming apparatus which has photosensitive members and a light irradiation unit irradiating at least one of the photosensitive members, the color image forming apparatus including: a laser driving unit causing the light irradiation unit to emit light of a light amount at a first emission level for printing when exposing an image portion and to emit light of a light amount at a second emission level for weak emission when exposing a non-image portion; an acquiring unit acquiring information of remaining lifetime of each of the photosensitive members; a first light intensity adjusting unit adjusting a first drive current to emit light at the first emission level; and a second light intensity adjusting unit adjusting a second drive current to emit light at the second emission level, the second light intensity adjusting unit changing the second drive current in accordance with the information.

Abstract: A color image forming apparatus has a plurality of photosensitive members, a light emitting element emitting light, a laser driving unit causing the light emitting element to emit light of a light amount at a first emission level for visualizing the toner image onto a first area where the toner image is to be visualized on the charged photosensitive member and to emit light of a light amount at a second emission level for weak emission onto a second area where the toner is not to be adhered to the charged photosensitive member. In addition, an acquiring unit acquires information associated with a remaining lifetime of each of the photosensitive members, a first drive current adjusting unit adjusts the first drive current, and a second drive current adjusting unit adjusts the second drive current, with the second drive current adjusting unit changing a magnitude of the second drive current in accordance with the information associated with the remaining lifetime of each of the photosensitive members.

Abstract: In a color image forming apparatus, the amount of light of an exposure unit for a weak exposure is changed according to a remaining service life of a photosensitive drum when the weak exposure is performed for the background area of a corresponding photosensitive drum by using the exposure unit.

Abstract: A driving unit causes first and second light emitting units each to emit light in a time following a pulse duty with a light amount at a first light emission level for printing on an image portion in an image formable region of a photosensitive member according to input of print data, and causes the first and the second light emitting units each to emit light with a light amount at a second light emission level of weak light emission on a non-image portion in the image formable region of the photosensitive member, and an adjustment unit adjusts each of first, second, third, and fourth driving currents for a plurality of times in one job.

Abstract: The image forming apparatus includes a photosensitive drum and a light emitting device. In the rotational axis direction of the photosensitive drum, the width of the weak light exposure region on the photosensitive drum in which an exposing device emits weak light is larger than the width of a region corresponding to the width of a recording medium on which an image is formed, but smaller than the width of a region on the photosensitive drum charged by a charging roller.

Abstract: To provide high flexibility in the arrangement of optical paths toward a plurality of photosensitive members and not to cause an increase in size of an image forming apparatus even when a cartridge capacity is increased, provided is an image forming apparatus including: light source units; a deflecting unit for deflecting a plurality of light beams for scanning; a plurality of photosensitive members; an imaging optical system for imaging the light beams deflected for scanning; and a plurality of toner containers, in which the toner containers are different in capacity, and an optical path length from the photosensitive member for the same color as the toner container having a large capacity to the deflecting surface of the deflecting unit is longer than an optical path length from the photosensitive member for the same color as the toner container having a small capacity to the deflecting surface of the deflecting unit.

Abstract: A color image forming apparatus specifies print mode (media), forms a test image based on gradation levels of a plurality of colors according to the specified print mode (media), and detects the test image with a color sensor. The color image forming apparatus performs gray axis correction calculation based on detection result obtained by the color sensor.

Abstract: Provided is a color image forming apparatus which has photosensitive members and a light irradiation unit irradiating at least one of the photosensitive members, the color image forming apparatus including: a laser driving unit causing the light irradiation unit to emit light of a light amount at a first emission level for printing when exposing an image portion and to emit light of a light amount at a second emission level for weak emission when exposing a non-image portion; an acquiring unit acquiring information of remaining lifetime of each of the photosensitive members; a first light intensity adjusting unit adjusting a first drive current to emit light at the first emission level; and a second light intensity adjusting unit adjusting a second drive current to emit light at the second emission level, the second light intensity adjusting unit changing the second drive current in accordance with the information.

Abstract: A color image forming apparatus specifies print mode (media), forms a test image based on gradation levels of a plurality of colors according to the specified print mode (media), and detects the test image with a color sensor. The color image forming apparatus performs gray axis correction calculation based on detection result obtained by the color sensor.