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 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: 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: 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: 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 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: 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 difference between Tscn and Tenv and Tscn.

Abstract: A structure in which a shutter is moved in a first direction by a motor, an opening is provided in the shutter, and the shutter is moved in a second direction using an elastic force of a spring connected to an upper cover of a light scanning device and an inside wall at the opening of the shutter increases the size of the structure of the shutter and the structure of the light scanning device due to the position of the spring. Therefore, a recess is provided in an opposing surface of a cover opposing a shutter, and a spring for sliding the shutter is connected to a connection portion provided at the recess. The recess is provided at a side opposite to the light source units with a polygon mirror being interposed therebetween.

Abstract: In the structure of a shutter moving mechanism, if the inclination angle of an elongated hole with respect to a sliding direction of a shutter is increased, it is necessary to increase the size of a movement plate for moving the shutter. On the other hand, if the inclination angle of the elongated hole with respect to the sliding direction of the shutter is decreased, an urging force with which a user urges the door against an image forming apparatus when shutting the door is increased. A shutter moving mechanism includes a rotation mechanism and moves the shutter by rotation of the rotation mechanism.

Abstract: A leaf spring includes a first pressing portion that presses a reflection mirror supported by a mirror support, and an engagement portion that engages with an engagement portion provided on a housing. In a first state in which the engagement portions are engaged with each other, the first pressing portion presses the reflection mirror so that the reflection mirror is urged against the mirror support. When a state of the leaf spring is being changed to the first state from a second state in which the engagement portions are not engaged with each other, the leaf spring comes into contact with the engagement portion provided on the housing and rotates such that the engagement portion provided on the housing serves as a fulcrum.

Abstract: An image forming apparatus including: a light scanning apparatus having an optical box containing a deflector configured to deflect a light beam scanning a photosensitive member, the light scanning apparatus being mounted to a main body of the image forming apparatus by being inserted through an insertion portion formed in the main body; a supporting unit including a first and a second supporting portions to support, in a direction intersecting an inserting direction of the box, the box in a vicinity of a downstream side wall of the optical box in the inserting direction, and a third supporting portion to support the box in a vicinity of an upstream side wall of the box; and a connecting portion configured to connect the box and the main body in the vicinity of the upstream side wall and on at least one side of the third supporting portion in the direction.

Abstract: In an image forming apparatus (100) 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 formed on an image carrier, of the first color and a second measurement image, which 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 second information. 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 structure in which a shutter is moved in a first direction by a motor, an opening is provided in the shutter, and the shutter is moved in a second direction using an elastic force of a spring connected to an upper cover of a light scanning device and an inside wall at the opening of the shutter increases the size of the structure of the shutter and the structure of the light scanning device due to the position of the spring. Therefore, a recess is provided in an opposing surface of a cover opposing a shutter, and a spring for sliding the shutter is connected to a connection portion provided at the recess. The recess is provided at a side opposite to the light source units with a polygon mirror being interposed therebetween.

Abstract: An image forming apparatus includes an image bearing member, a first image forming unit configured to form an image in a first color on the image bearing member, a second image forming unit configured to form an image in a second color different from the first color on the image bearing member, a measurement unit configured to measure positional information of measurement images formed on the image bearing member by the first and the second image forming unit, a correction unit configured to correct a position of an image formed on the image bearing member by the first and the second image forming unit based on the positional information, a detection unit configured to detect a temperature of the image forming apparatus, and a control unit configured to control timing for causing the first and the second image forming unit to form the measurement images based on the detected temperature.

Abstract: A structure in which a shutter is moved in a first direction by a motor, an opening is provided in the shutter, and the shutter is moved in a second direction using an elastic force of a spring connected to an upper cover of a light scanning device and an inside wall at the opening of the shutter increases the size of the structure of the shutter and the structure of the light scanning device due to the position of the spring. Therefore, a recess 218b is provided in an opposing surface 218g of a cover 218 opposing a shutter 300, and a spring 310 for sliding the shutter 300 is connected to a connection portion 218e provided at the recess 218b. The recess 218b is provided at a side opposite to the light source units with a polygon mirror 203 being interposed therebetween.

Abstract: In the structure of a shutter moving mechanism, if the inclination angle of an elongated hole with respect to a sliding direction of a shutter is increased, it is necessary to increase the size of a movement plate for moving the shutter. On the other hand, if the inclination angle of the elongated hole with respect to the sliding direction of the shutter is decreased, an urging force with which a user urges the door against an image forming apparatus when shutting the door is increased. A shutter moving mechanism includes a rotation mechanism and moves the shutter by rotation of the rotation mechanism.

Abstract: A leaf spring includes a first pressing portion that presses a reflection mirror supported by a mirror support, and an engagement portion that engages with an engagement portion provided on a housing. In a first state in which the engagement portions are engaged with each other, the first pressing portion presses the reflection mirror so that the reflection mirror is urged against the mirror support. When a state of the leaf spring is being changed to the first state from a second state in which the engagement portions are not engaged with each other, the leaf spring comes into contact with the engagement portion provided on the housing and rotates such that the engagement portion provided on the housing serves as a fulcrum.

Abstract: An image forming apparatus including: a light scanning apparatus having an optical box containing a deflector configured to deflect a light beam scanning a photosensitive member, the light scanning apparatus being mounted to a main body of the image forming apparatus by being inserted through an insertion portion formed in the main body; a supporting unit including a first and a second supporting portions to support, in a direction intersecting an inserting direction of the box, the box in a vicinity of a downstream side wall of the optical box in the inserting direction, and a third supporting portion to support the box in a vicinity of an upsteram side wall of the box; and a connecting portion configured to connect the box and the main body in the vicinity of the upstream side wall and on at least one side of the third supporting portion in the direction.

Abstract: An image forming apparatus includes an image bearing member, a first image forming unit configured to form an image in a first color on the image bearing member, a second image forming unit configured to form an image in a second color different from the first color on the image bearing member, a measurement unit configured to measure positional information of measurement images formed on the image bearing member by the first and the second image forming unit, a correction unit configured to correct a position of an image formed on the image bearing member by the first and the second image forming unit based on the positional information, a detection unit configured to detect a temperature of the image forming apparatus, and a control unit configured to control timing for causing the first and the second image forming unit to form the measurement images based on the detected temperature.