Abstract: An image forming apparatus includes an optical print head, an optical print head moving mechanism, an abutting portion, a projected portion, an opposing portion, and a preventing portion provided on the projected portion so that in a state in which a drum cartridge is dismounted from a main assembly of the image forming apparatus, the preventing portion is contacted to the opposing portion by movement of the optical print head moved by the moving mechanism toward a side downstream of the exposure position with respect to the movement direction and prevents further movement of the optical print head in the movement direction and so that in a state in which the drum cartridge is mounted in the main assembly and the abutting portion contacts the drum cartridge, the preventing portion is in non-contact with the opposing portion.

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: An image forming apparatus includes a main assembly, a photosensitive drum, an optical print head, a receiving portion, a portion-to-be-engaged, and a guiding portion. The guiding portion is provided between the portion-to-be-engaged and the receiving portion with an interval from both the portion-to-be-engaged and the receiving portion. The guiding portion guides movement of the cleaning member in a direction from the receiving portion toward the portion-to-be-engaged while limiting movement of the cleaning member in a direction different from the longitudinal direction of the cleaning member to engage the engaging portion with the portion-to-be-engaged.

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: An image forming apparatus includes a drum unit, an optical print head, a moving mechanism, a moving mechanism supporting member, a main assembly, a flexible flat cable, a first cover portion made of a resin material and provided in the supporting member so as to cover a first portion of a cutting plane of the opening, the first portion opposing one surface of the flexible flat cable, and a second cover portion made of a resin material and provided in the supporting member so as to cover a second portion of the cutting plane of the opening, the second portion opposing the other surface of the flexible flat cable.

Abstract: An image forming apparatus includes a drum cartridge including a photosensitive drum, a movable optical print head including a light emitting element and a lens array, and a portion-to-be-contacted. The photosensitive drum and a light emergent surface of the lens array are spaced from each other to permit insertion of a cleaning member therebetween from an outside of the main assembly. The portion-to-be-contacted provided in a main assembly and configured to be contacted by the cleaning member to prevent further insertion of said cleaning member after said cleaning member cleans said light emergent surface by sliding on the light emergent surface from one end side toward the other end side of the light emergent surface with respect to a longitudinal direction of said lens array.

Abstract: An image forming apparatus includes an optical print head, an optical print head moving mechanism, an abutting portion, a projected portion, an opposing portion, and a preventing portion provided on the projected portion so that in a state in which a drum cartridge is dismounted from a main assembly of the image forming apparatus, the preventing portion is contacted to the opposing portion by movement of the optical print head moved by the moving mechanism toward a side downstream of the exposure position with respect to the movement direction and prevents further movement of the optical print head in the movement direction and so that in a state in which the drum cartridge is mounted in the main assembly and the abutting portion contacts the drum cartridge, the preventing portion is in non-contact with the opposing portion.

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: An image forming apparatus including a controller, which starts rotation of a rotary polygon mirror when a predetermined condition is satisfied, rotates the rotary polygon mirror at a predetermined rotation speed based on a first pulse in a first state in which light beams are not emitted from a light source, thereafter starts emission of the light beams, switches a rotation control based on the first pulse to a rotation control based on the second pulse, and rotates the rotary polygon mirror at the predetermined rotation speed based on the second pulse in a second state in which the light beams are emitted from the light source, and thereafter detects a temperature of a drive circuit board by a temperature detector, and corrects color misregistration using a detected temperature of the temperature detector and the detection result of a pattern detector.

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.

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: 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: 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: 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: Prediction accuracy of a color misregistration amount in an image formation executed in an image forming apparatus is improved. The image forming apparatus comprises an optical box storing an optical system for irradiating a laser beam from a laser source to a photosensitive drum, a scanner temperature sensor provided near the optical box, and an environmental temperature sensor for detecting a surrounding temperature of the image forming apparatus, and a control section. When image formation is executed, the control section obtains a temperature Tscn detected by the scanner temperature sensor and a temperature Tenv detected by the environmental temperature sensor and calculates a prediction value of a position misregistration amount to the photoreceptor of the laser beam using the difference between Tscn and Tenv.

Abstract: In an image forming apparatus, an image forming unit forms a first image of a first color and a second image of a second color. An obtaining unit obtains information related to relative positions of a first measurement image, which is formed on an image carrier, of the first color and a second measurement image, which is formed on an image carrier, of the second color. A generation unit generates correlation data based on first information corresponding to a first image forming speed and second information corresponding to a second image forming speed. A controller, in a case where the image forming unit forms an image at the second image forming speed, corrects relative positions of the first image and the second image based on the first information in advance and the correlation data.

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: 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.