Abstract: An opening, from which a cleaning member is inserted from the outer side of a main body of the image forming apparatus according to the present invention, is provided further toward the front side than an end portion of a front side of a holding member. The opening guides movement of the cleaning member in the direction of insertion as the inserted cleaning member moves toward the downstream side in the direction of insertion, so that downstream-side end portions of engaging portions in the insertion direction engage upstream-side end portions of protruding portions formed on the holding member in the direction of insertion.

Abstract: A simple structure is provided to move an optical print head toward a photosensitive drum. An image forming apparatus includes an optical print head having a first link portion and a second link portion, a sliding portion configured to move by sliding as to an image forming apparatus main body, and an abutting portion where one end of the optical print head abuts. When the sliding portion moves by sliding, the first link portion and the second link portion pivot as to the sliding portion, with the one end of the optical print head abutting the abutting portion, and the optical print head moves toward the photosensitive drum.

Abstract: A holding member that holds an optical print head for exposing a photosensitive drum is provided with one abutting pin at each end thereof in the longitudinal direction. Each abutting pin has both a function of forming a gap between the optical print head and the photosensitive drum, and a function of restricting movement of the holding member in the X direction and Y direction. The holding member is supported by a link member further toward the side of the photosensitive drum than the lower end portion of the abutting pins.

Abstract: An exposing unit includes a holding member, an abutting pin protruding on both sides in the vertical direction at the rear side of the holding member, a second support portion provided further to the rear side than the holding member, and a movement mechanism that causes the holding member to move between an exposure position and a retracted position. The second support portion has a gap formed where the rear side of the holding member moves in the vertical direction, and this gap restricts movement of the holding member in the left-and-right direction. The holding member that is moved from the retracted position toward the exposure position by the movement mechanism is guided by the gap formed in the second support portion so that the abutting pin abuts a fitting portion.

Abstract: An image forming apparatus has a holding member that holds a lens array and a circuit board. In the holding member, a portion where a light emission portion is attached, a portion where the lens array is attached, a portion where the circuit board is attached, and a portion where a first link member and a second link member are connected, are integrally molded as a molded resin article.

Abstract: Provided are a first seating face and a second seating face, to which a lower side of a holding member of an optical print head being moved from an exposure position toward a retracted position by a movement mechanism strikes in the direction of movement thereof. A light emission face of a lens array of the holding member that has abutted the first seating face and second seating face is thereby positioned on a movement path of a rubbing portion provided on a cleaning member that is inserted from an opening.

Abstract: The length of an abutting pin of an optical print head is decided such that the upper end of the abutting pin when at a cleaning position is on the opposite side of a movement path of a cleaning member, from the upper end of another abutting pin of the optical print head when in an exposure position.

Abstract: A light scanning apparatus, including: a light source configured to emit a light beam; and a rotary polygon mirror configured to deflect the light beam emitted from the light source so that the light beam scans a surface of a photosensitive member, wherein the rotary polygon mirror is formed in a four-sided polygon, and wherein a difference between a pair of diametrically opposed interior angles of the rotary polygon mirror is larger than 0.03°, and a difference between another pair of diametrically opposed interior angles of the rotary polygon mirror is 0.03° or less.

Abstract: A laser holder includes a bridge portion connected to a holding portion via two projecting portions so as to bridge the two projecting portions, and the bridge portion includes a contacting portion configured to come into contact with the optical box by being pressed against an optical box by a screw head of a second fixing screw.

Abstract: A casing of an optical scanning apparatus includes: a mounting portion to which a sound-insulating member is mountable; a first and a second support portions supporting a reflective mirror in the casing on which the sound-insulating member is mounted and brought into contact with a back surface of the reflective mirror; and a third and a fourth support portions supporting a reflective mirror in the casing on which the sound-insulating member is not mounted and brought into contact with a back surface of the reflective mirror, wherein the first and the second support portions are positioned between the third and the fourth support portions in a longitudinal direction of the reflective mirror, and contact portions of the third and the fourth support portions protrude toward a reflective surface side of the reflective mirror to be arranged with respect to contact portions of the first and the second support portions.

Abstract: An optical scanning apparatus includes: a casing having a bottom face; a cylindrical portion having a first opening through which a laser beam from a light source passes; a light-transmitting member arranged between the cylindrical portion and a rotary polygon mirror; a plate spring fixing the light-transmitting member; and a sealing member between the cylindrical portion and the plate spring, wherein a width of the first opening narrows progressively in a insertion direction of the plate spring, the sealing member comes into contact with the cylindrical portion in a first region when the plate spring is inserted, and in a second region closer to the bottom face than the first region, a region, in which the sealing member comes into contact with the cylindrical portion, expands toward a center part from two end portions of a leading end portion of the sealing member as the plate spring is inserted further.

Abstract: A light scanning apparatus including: a bottom surface on which a rotary polygon mirror is mounted; a housing including a bottom surface on which the rotary polygon mirror is mounted and a side wall portion on which a first light source and a second light source are mounted, the side wall portion standing from the bottom surface; and a wall portion standing from the bottom surface, the wall portion being configured to block a first light beam emitted from the first light source and reflected by an inner wall of a first holder holding the first light source and a second light beam emitted from the second light source and reflected by an inner wall of the second holder holding the second light source.

Abstract: A method of manufacturing a light scanning apparatus, including: forming an optical box having a plurality of protrusions arranged along a longitudinal direction of a reflection mirror and provided at positions corresponding to one end side and the other end side of the reflection mirror in the longitudinal direction, respectively; processing protrusions except protrusions that are used for supporting the reflection mirror so that the protrusions except the protrusions that are used for supporting the reflection mirror on the one end side and on the other end side of the reflection mirror are out of contact with the reflection mirror; placing the reflection mirror on the protrusions that have not been processed in the processing; and fixing the reflection mirror, which has been placed on the protrusions that have not been processed in the placing, to the optical box.

Abstract: A light scanning apparatus including: a light receiving portion configured to receive a first laser beam to generate a synchronization signal; and a standing portion, wherein a first opening through which a part of the first laser beam that is emitted from a first light source and travels toward a rotary polygon mirror and the first laser beam that is emitted from the first light source and is deflected by the rotary polygon mirror pass and a second opening through which a part of the second laser beam that is emitted from a second light source and travels toward the rotary polygon mirror passes are provided in the standing portion, and wherein the first laser beam that is deflected by the rotary polygon mirror and passes through the first opening is incident on the light receiving portion.

Abstract: Provided is a casing of a light scanning apparatus accommodating a rotary polygon mirror and an optical member, the casing including: first seat surfaces arranged on a bottom surface of the casing to mount a first deflection portion that includes a first rotary polygon mirror, a first motor, and a first board on which the first rotary polygon mirror and the first motor are fixed; and second seat surfaces arranged on the bottom surface to mount a second deflection portion that includes a second rotary polygon mirror, a second motor having a maximum number of revolutions higher than that of the first motor, a second board on which the second rotary polygon mirror and the second motor are fixed, and a mounting portion supporting the second board, wherein at least one of the second seat surfaces is arranged outside of a region formed by connecting the first seat surfaces.

Abstract: A casing of an optical scanning apparatus housing a rotary polygon mirror and an optical member: a mounting portion on which a sound insulation member separating the optical member from the rotary polygon mirror is mountable; a first support portion supporting a transparent member which covers an opening of the casing on which the sound insulation member is mounted; a second support portion supporting a transparent member which covers the opening of the casing on which the sound insulation member is not mounted and is thicker than the transparent member to be supported by the first support portion; and a bearing surface of the second support portion located on an inner side of the casing than a bearing surface of the first support portion so that light beam emission surfaces of the transparent members to be supported by the first and second support portions are on a substantially same plane.

Abstract: A light scanning apparatus, including: a light source; a rotary polygon mirror configured to deflect a light beam emitted from the light source; a plurality of optical members configured to guide the light beam, which is deflected by the rotary polygon mirror, to a photosensitive member; a drive motor configured to rotate the rotary polygon mirror; an optical box to which the light source is attached, the optical box containing the rotary polygon mirror, the drive motor, and the optical members; and a dynamic vibration absorber mounted inside the optical box and configured to be vibrated by vibrations of the optical box, wherein the plurality of optical members are supported on a bottom portion of the optical box, and the dynamic vibration absorber is disposed on the bottom portion of the optical box at a position between at least two adjacent optical members among the plurality of optical members.

Abstract: An image forming apparatus, including: a cartridge including a photosensitive drum and a regulation portion; a light emitting device configured to emit light from a light emission surface to the photosensitive drum; and a movement unit configured to reciprocate the light emitting device between an exposure position and a retracted position, wherein the regulation portion regulates a cleaning member, which includes a cleaning portion configured to rub and clean the light emission surface by a sliding movement of the cleaning member on the light emission surface of the light emitting device positioned at the retracted position so as to prevent the cleaning member from contacting the photosensitive drum and so as to bias the cleaning portion to prevent the cleaning portion from being separated from the light emission surface during the sliding movement of the cleaning member.

Abstract: An image forming apparatus includes: an LED print head exposing a photosensitive drum with light; a door arranged on one end side of the LED print head; a support portion for the LED print head operating in conjunction with opening and closing movements of the door, positioning the LED print head at a first position for exposing the photosensitive drum when the door is closed, and positioning the LED print head at a second position more apart from the photosensitive drum than the first position when the door is open; and a guide portion formed on the door and guiding a cleaning member to the LED print head, the guide portion having a first inclined surface which is lowered toward the LED print head so that the cleaning member is continuously held in contact with the LED print head under a state in which the door is open.

Abstract: An optical scanning apparatus includes a light source, a deflecting unit, a reflection mirror, a casing, and first and second leaf springs. The casing includes first and second mirror supporting portions and a facing portion. The following relationship is satisfied: D2<L+W?D1. With respect to a longitudinal direction, L is a length of the reflection mirror, D1 is a longest distance between the first and second supporting portions, W is a contact width of the second supporting portion to the reflection mirror, and D2 is a distance between the facing portion and a closest position thereto of the first supporting portion. The first and second leaf springs urge the reflection mirror against the first and second mirror supporting portions, respectively. At least one of the first and second leaf springs is bonded to the reflection mirror with an adhesive.