Abstract: A light scanning apparatus, including: a first holding member configured to hold a first light emitting element configured to emit a first light beam; a second holding member configured to hold a second light emitting element configured to emit a second light beam; a rotary polygon mirror; a first mounting portion on which the first holding member is mounted; and a second mounting portion on which the second holding member is mounted, the second mounting portion being provided adjacent to the first mounting portion, wherein the first mounting portion has a V-shape including two limbs in a cross section, and wherein one limb of the two limbs on the side of the second mounting portion is shorter than other limb of the two limbs on a side opposite to the side of the second mounting portion.

Abstract: A pupil splitting lens that splits a pupil of a light beam from a deflector into a plurality of light beams in a main scanning direction of the deflector and a pupil splitting lens that splits the light beam into a plurality of light beams in a sub-scanning direction are disposed relative to a light detection element. The light detection element detects image forming positions of the four light beams formed as a result of the splitting by the plurality of pupil splitting lenses. A CPU determines the amount of focus shift and the amount of image forming position shift from these four image forming positions.

Abstract: An optical scanning apparatus includes a deflecting device for scanning and deflecting a light beam, a first optical member onto which reflected light from the deflecting device is incident, a wall disposed between the first optical member and the deflecting device, a mirror that reflects the light beam having passed through the first optical member, a second optical member disposed above the deflecting device to guide and form an image of reflected light from the mirror on a surface to be scanned, a supporting member supporting the second optical member and having at least one bent portion, and a housing. The bent portion of the supporting member is disposed above the deflecting device in a position nearer to the deflecting device than the wall face in a direction perpendicular to the deflecting face of the deflecting device so that a flow of air produced by the deflecting device is branched.

Abstract: A pupil splitting lens that splits a pupil of a light beam from a deflector into a plurality of light beams in a main scanning direction of the deflector and a pupil splitting lens that splits the light beam into a plurality of light beams in a sub-scanning direction are disposed relative to a light detection element. The light detection element detects image forming positions of the four light beams formed as a result of the splitting by the plurality of pupil splitting lenses. A CPU determines the amount of focus shift and the amount of image forming position shift from these four image forming positions.

Abstract: An optical scanning apparatus includes a deflecting device for scanning and deflecting a light beam, a first optical member onto which reflected light from the deflecting device is incident, a wall disposed between the first optical member and the deflecting device, a mirror that reflects the light beam having passed through the first optical member, a second optical member disposed above the deflecting device to guide and form an image of reflected light from the mirror on a surface to be scanned, a supporting member supporting the second optical member and having at least one bent portion, and a housing. The bent portion of the supporting member is disposed above the deflecting device in a position nearer to the deflecting device than the wall face in a direction perpendicular to the deflecting face of the deflecting device so that a flow of air produced by the deflecting device is branched.

Abstract: An optical scanning apparatus includes a light source configured to emit a light beam, a scanning unit configured to deflect the light beam from the light source so as to scan a photosensitive member, an optical lens configured to guide the light beam scanned by the scanning unit onto the photosensitive member, and a lens supporting unit having a fixing portion configured to fix the optical lens, wherein the lens supporting unit includes a movable supporting portion configured to restrict movement of the optical lens in a direction perpendicular to a scanning direction of the light beam and an optical axis direction of the optical lens, to restrict movement of the optical lens in the optical axis direction, and to support the optical lens movably in the scanning direction.

Abstract: An optical scanning apparatus includes a laser diode, electro-optical crystal member, BD sensor, two light detection sensors and voltage control unit. The electro-optical crystal member is arranged in the optical path between the laser diode and a polygon mirror, and deflects the light beam in the sub-scanning direction by applied voltage. The BD sensor and two light detection sensors detect the light beam deflected in the sub-scanning direction. A scanning control unit controls, based on the detection results obtained by the BD sensor and two light detection sensors, the irradiation position of the light beam on a photosensitive drum. The BD sensor and two light detection sensors are arranged at positions distant in the sub-scanning direction from an optical path to the photosensitive drum and at the central portion and two end portions of an image forming region in the main scanning direction.

Abstract: In an optical scanning device, a rotational axis of a first rotary polygon mirror and a rotational axis of a second rotary polygon mirror are inclined toward the same side with respect to a direction perpendicular to a reference plane inclusive of each of center axes of a first member to be scanned and a second member to be scanned, as viewed in directions of the center axes of the first member to be scanned and the second member to be scanned. As a consequence, a width in an arrangement direction of a plurality of rotary polygon mirrors can be reduced, thus achieving miniaturization without degrading a quality of an image in an image forming apparatus.

Abstract: In an optical scanning device, a rotational axis of a first rotary polygon mirror and a rotational axis of a second rotary polygon mirror are inclined toward the same side with respect to a direction perpendicular to a reference plane inclusive of each of center axes of a first member to be scanned and a second member to be scanned, as viewed in directions of the center axes of the first member to be scanned and the second member to be scanned. As a consequence, a width in an arrangement direction of a plurality of rotary polygon mirrors can be reduced, thus achieving miniaturization without degrading a quality of an image in an image forming apparatus.

Abstract: In an optical scanning device, a rotational axis of a first rotary polygon mirror and a rotational axis of a second rotary polygon mirror are inclined toward the same side with respect to a direction perpendicular to a reference plane inclusive of each of center axes of a first member to be scanned and a second member to be scanned, as viewed in directions of the center axes of the first member to be scanned and the second member to be scanned. As a consequence, a width in an arrangement direction of a plurality of rotary polygon mirrors can be reduced, thus achieving miniaturization without degrading a quality of an image in an image forming apparatus.

Abstract: In an optical scanning device, a rotational axis of a first rotary polygon mirror and a rotational axis of a second rotary polygon mirror are inclined toward the same side with respect to a direction perpendicular to a reference plane inclusive of each of center axes of a first member to be scanned and a second member to be scanned, as viewed in directions of the center axes of the first member to be scanned and the second member to be scanned. As a consequence, a width in an arrangement direction of a plurality of rotary polygon mirrors can be reduced, thus achieving miniaturization without degrading a quality of an image in an image forming apparatus.

Abstract: An optical scanning apparatus includes a laser diode, electro-optical crystal member, BD sensor, two light detection sensors and voltage control unit. The electro-optical crystal member is arranged in the optical path between the laser diode and a polygon mirror, and deflects the light beam in the sub-scanning direction by applied voltage. The BD sensor and two light detection sensors detect the light beam deflected in the sub-scanning direction. A scanning control unit controls, based on the detection results obtained by the BD sensor and two light detection sensors, the irradiation position of the light beam on a photosensitive drum. The BD sensor and two light detection sensors are arranged at positions distant in the sub-scanning direction from an optical path to the photosensitive drum and at the central portion and two end portions of an image forming region in the main scanning direction.

Abstract: An image forming apparatus including a first circuit substrate, a second circuit substrate, a first supporting member for supporting the first circuit substrate, a second supporting member for supporting the second circuit substrate, a holding member for holding the first supporting member and the second supporting member, and a connector for cablelessly connecting the first circuit substrate and the second circuit substrate together, wherein at least one of the first supporting member and the second supporting member is movable in a direction in which the connection by the connector is released, and the first supporting member and the second supporting member are mountable to and dismountable from the holding member independently of each other.

Abstract: An image forming apparatus includes an image forming unit for forming an image; a first electrical substrate having an electric circuit for electric power supply to the image forming unit; a second electrical substrate disposed above the first electrical substrate and having an electric circuit for operating the image forming unit; an opening formed above the first electrical substrate in fluid communication with ambient air; and a partition member for partitioning the first electrical substrate and the second electrical substrate and for forming an air flow path from the first electrical substrate to the opening.

Abstract: An image forming apparatus including a first circuit substrate, a second circuit substrate, a first supporting member for supporting the first circuit substrate, a second supporting member for supporting the second circuit substrate, a holding member for holding the first supporting member and the second supporting member, and a connector for cablelessly connecting the first circuit substrate and the second circuit substrate together, wherein at least one of the first supporting member and the second supporting member is movable in a direction in which the connection by the connector is released, and the first supporting member and the second supporting member are mountable to and dismountable from the holding member independently of each other.

Abstract: An image forming apparatus includes image forming means for forming an image; a first electrical substrate having an electric circuit for electric power supply to the image forming means; a second electrical substrate disposed above the first electrical substrate and having an electric circuit for electric power supply to the image forming means; an opening formed above the first electrical substrate in fluid communication with an ambient air; and a partition member for partitioning the first electrical substrate and the second electrical substrate and for forming an air flow path from the first electrical substrate to the opening.