An optical scanning device that scans a target surface with light, includes: a light source; a deflector that deflects light of the light source; and an optical system that forms an image of light deflected, wherein the deflector includes: a polygon mirror that reflects and deflects light of the light source; a motor that rotates the polygon mirror; and a case body that airtightly houses the polygon mirror and the motor, the case body includes a cylindrical inner wall, and the inner wall includes a rectifier that guides, from one to the other of a first space and a second space, an air flow generated by rotation of the polygon mirror in a space surrounded by the inner wall, and the first space is located on the motor side with respect to the polygon mirror and the second space is located on an opposite side of the first space.

A device and a method for deflecting a beam of light. The device is developed together with: an adjustable deflection device; a closed-loop control unit, which is designed to generate an actuating signal by which the deflection device is controlled in a periodic movement for scanning a solid angle region with the aid of a beam of light deflected by the deflection device; and a detector device, which is designed to detect an impingement or a missing impingement of the scanning beam of light on the detector device, and to generate a measuring signal based thereon; the closed-loop control unit furthermore being designed to adapt the actuating signal based on at least the measuring signal.

An image reading apparatus includes a reader, a conveying path, a conveyer, a conveyer driving unit, a conveyer housing, a lighting unit, a cooler, and a frame. The reader reads an image on a sheet at a predetermined reading position. The conveying path guides the sheet having the image to the reading position and guides the sheet read by the reader in an ejecting direction. The conveyer conveys the sheet along the conveying path. The conveyer driving unit drives the conveyer. The conveyer housing supports the conveying path, the conveyer, and the conveyer driving unit. The lighting unit is fixed to an interior of the reader and illuminates the sheet conveyed by the conveyer to the reading position. The cooler cools the lighting unit. The frame separately fixes the reader and the conveyer housing. The cooler is fixed to the conveyer housing.

In an optical scanning device, an optical deflector includes a base plate, a rotor having an axis of rotation orthogonal to the base plate, and a polygon mirror fixed to the rotor; the polygon mirror has a plurality of reflecting surfaces tilted at a predetermined angle with respect to the axis of rotation. Protrusions protruding from a bottom surface of a frame have bearing surfaces at respective distal ends thereof; the bearing surfaces are in contact with the base plate. The bottom surface includes a first region on which a first protrusion is disposed, and a second region on which a second protrusion is disposed, and a distance between the first region and a scanning plane containing optical axes in cross sections taken along a sub scanning direction of a scanning lens is different from a distance between the second region and the scanning plane.

A document processing device includes a scanner, a display, a notification unit, and a control unit. The scanner is configured to read a document provided on a document table. The display is configured to display image data of the document read by the scanner. The notification unit is configured to provide a notification warning to indicate that the document has not been removed from the document table. The control unit is configured to detect the document on the document table.

An optical scanning device according to an embodiment includes a light source, a MEMS mirror, a MEMS-mirror driving unit, a control unit, and a sensor. The light source radiates a plurality of laser beams that scan a photoconductive drum. The MEMS mirror includes a reflection surface that reflects the plurality of laser beams radiated from the light source. The MEMS-mirror driving unit reciprocatingly moves the MEMS mirror. The sensor supplies a horizontal synchronization signal to the control unit by detecting the laser beam reflected on the reflection surface when the MEMS mirror reaches a predetermined position. After detecting the horizontal synchronization signal supplied from the sensor, the control unit performs the auto power control of the light amount of at least one laser beam among the plurality of laser beams.

A first mirror and a second mirror are disposed on a mounting surface of a housing in an exposure device of an image forming apparatus. A back surface of the first mirror is supported by ribs and the first mirror is pressed against the ribs by elastically pressing a reflecting surface thereof by a spring member. A reflecting surface of the second mirror is supported by ribs and the second mirror is pressed against the ribs by elastically pressing a back surface thereof by a spring member.

A surface-emitting laser includes an active layer on which a spacer layer is disposed, and a reflection mirror disposed on the spacer layer, including a current constriction layer that is a selectively-oxidized layer having been selectively oxidized. The current constriction layer is disposed at a position of a node of a standing-wave of an electric field of light oscillated at the active layer and is disposed away from an interface between the spacer layer and the reflection mirror by an optical distance of one-fourth of an oscillation wavelength at the active layer. The selectively-oxidized layer is made of AlGaAs. The reflection mirror includes at least one AlGaInP layer contacting the selectively-oxidized layer.

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.

A light scanning apparatus including: a first holder attached to a housing and configured to hold a first laser light source; a second holder attached to the housing and configured to hold a second laser light source; and a lens to which the laser lights are first incident, wherein the first holder and the second holder are attached to the housing in mutually different positions in a rotation axis direction of a rotary polygon mirror and in an optical axis direction of the lens, so that a first incident light path from the first laser light source to the rotary polygon mirror is placed between a second incident light path from the second laser light source to the rotary polygon mirror and the lens, and the first holder and the second holder overlap one another in the rotation axis direction.