An image inspection apparatus includes: an illumination part that emits light on an inspection target; a reading part that is arranged with, in one or more dimensions, elements that detect light reflected by the inspection target, the reading part reading an entire width of the inspection target; and a hardware processor that inspects a characteristic of the inspection target, wherein a light guide member is provided at a position where light regularly reflected by the inspection target passes, the light guide member is arranged to allow an optical path of light incident on the reading part via the light guide member to be parallel to an optical path of light incident on the reading part without via the light guide member, and the hardware processor inspects a gloss distribution of the inspection target, and inspects a density distribution of the inspection target.

An image-reading apparatus includes: a light-receiving unit that receives reflected light from a recording material on which an image is formed; and multiple light-reflecting members that reflect the reflected light from the recording material toward the light-receiving unit. At least one light-reflecting member of the multiple light-reflecting members reflect the reflected light multiple times.

An image reading unit includes an illumination portion, a reading portion, a casing, and a reflection member including a reflecting surface. The casing is provided with an opening. The reflection member is held outside of the opening of the casing so that at least a part of the reflecting surface is exposed to the inside of the casing through the opening.

An image reading optical system includes an image reading portion, multiple light reflection portions, and a diaphragm. The image reading portion includes an array of reading elements that read incident light. The light reflection portions reflect light traveling from a readable object to the image reading portion. The diaphragm regulates light traveling from a first one of the light reflection portions to a subsequent one of the light reflection portions in a specific direction. The diaphragm includes a first light shielding portion and a second light shielding portion disposed at different positions in a travel direction of the light with respect to the first one of the light reflection portions to block part of the light. The first light shielding portion and the second light shielding portion are located in substantially a common plane. The first light shielding portion is disposed along an optical axis of light incident on the first one of the light reflection portions.

An image forming apparatus comprises a first temperature detector to detect a temperature of a first portion of an optical scanning device in a printer. The first portion is proximate to a heat generating element in the optical scanning device. A second temperature detector is provided to detect a temperature of a second portion of the optical scanning device, which is farther from the heat generating element than the first portion. A controller is configured to perform alignment control for correcting a color positional shift of the printer when either a detected temperature change of the first portion is greater than or equal to a first threshold value or a detected temperature change of the second portion is greater than or equal to a second threshold value.

An information detecting device detects information from a target. The information detecting device includes processing circuitry. The processing circuitry is configured to perform a first information acquisition operation of acquiring first information from a target criterion, a second information acquisition operation of acquiring second information from the target, and an information conversion operation of converting the second information acquired by the second information acquisition operation, into third information, with the first information acquired by the first information acquisition operation, the third information having a dimension different from respective dimensions of the first information and the second information; and perform control such that an information-acquisition condition in the first information acquisition operation is identical to an information-acquisition condition in the second information acquisition operation.

According to the present disclosure, a reading module includes a light source, an optical system, and a sensor. The optical system images, as image light, reflection light of light with which the light source has irradiated a document. The sensor converts the thus imaged image light into an electric signal. The optical system includes a mirror array in which a plurality of reflection mirrors are connected together, and a plurality of aperture stop portions. The reflection mirrors each reflect light at an angle that is different, as seen in a main scanning direction, from an angle at which an adjacent one of the reflection mirrors reflects light. The plurality of aperture stop portions are disposed on one side of the mirror array with respect to an orthogonal direction which is orthogonal to the main scanning direction.

An image forming apparatus includes a photosensitive member, a light source, a deflecting unit, a storing unit, a correcting unit, and a light source driving portion. Magnification correction data is determined using a quadratic function of a variable representing a scanning position with respect to a scanning direction. Coefficients of two quadratic functions corresponding to adjacent two regions included in a plurality of scanning regions are set so that a differential value calculated at the variable corresponding to a boundary of the two regions by a differential of the quadratic function for one region and a differential value calculated at the variable corresponding to the boundary of the two regions by a differential of the quadratic function for the other region are equal to each other.

A reading module has a light source, an optical system having a mirror array and an aperture stop portion, a sensor in which a plurality of image regions where the image light is converted into an electrical signal are arranged; a housing; and a light-shielding wall shielding stray light striking the image regions. In the mirror array, a plurality of reflective mirrors whose reflection surfaces are aspherical concave surfaces are coupled together in an array in the main scanning direction. The optical system is fixed to on the case housing at one point in the main scanning direction, and the light shielding walls are arranged at a positions displaced deviated by a predetermined amount from boundaries between the image regions in the direction opposite to the fixed side of the optical system.

An optical scanning device includes light sources, a deflector deflecting light beams emitted from the light sources, a first lens transmitting the light beams deflected by the defector, and second lenses guiding the light beams transmitted from the first lens to respective surfaces to be scanned. The second lenses are arranged so that a first incident position of a first light beam emitted by a first light source and entering one of the second lenses is closer to the respective surface to be scanned along an optical axis of the first lens than a second incident position of a second light beam emitted by a second light source and entering another of the second lenses, and an incident angle of the second light beam with respect to the optical axis along a deflection direction by the deflector is greater than the incident angle of the first light beam.