A reading module has a light source, an optical system, and a sensor. The optical system images, as image light, reflected light of light radiated from the light source to a document. In the sensor, the image light imaged by the optical system is converted into an electrical signal. The optical system has a mirror array and an aperture stop portion. In the mirror array, reflection mirrors are coupled together in an array in the main scanning direction. The aperture stop portion has a first aperture adjusting the amount of the image light reflected from a reflection mirror and a second aperture shielding stray light entering the first aperture from an adjacent reflection mirror. Between the first and second apertures, a reflection reduction mechanism is provided that reduces reflection, toward the first aperture, of light other than the image light traveling from the second to first aperture.

An image forming apparatus performs the following. An imaging range imaged by each of the plurality of imaging sensors includes an overlapping portion between the imaging sensors adjacent in a width direction orthogonal to a conveying direction along the conveying path. A hardware processor performs a calibration operation of a first sensor based on a color measuring result of a predetermined inspection image measured within a standard imaging range of the first sensor among the plurality of imaging sensors, and a standard imaging result within the standard imaging range imaging an inspection image with a same pattern as the inspection image. The hardware processor compares imaging results by the plurality of imaging sensors in the overlapping portions and performs the calibration operation of another sensor different from the first sensor using the standard imaging result as a standard.

An optical member includes a lens array including lens bodies, and transmissive members. The transmissive members are made of a material having a uniform refractive index, and are disposed at positions nearer an object to be read or at positions farther from the object to be read than the corresponding lens bodies are disposed. The transmissive members have a columnar shape extending along the optical axes of the lens bodies, and allow light incident through one end faces to exit through the other end faces. The optical axes of the lens bodies are deviated from the central axes of the transmissive members corresponding to the respective lens bodies at least in the sub-scanning direction, and an end face of the transmissive member to which an end face of each lens body is opposed is thereby an end face of the corresponding transmissive member.

An optical member includes a lens array including lens bodies, and transmissive members. The transmissive members are made of a material having a uniform refractive index, and are disposed at positions nearer an object to be read or at positions farther from the object to be read than the corresponding lens bodies are disposed. The transmissive members have a columnar shape extending along the optical axes of the lens bodies, and allow light incident through one end faces to exit through the other end faces. The optical axes of the lens bodies are deviated from the central axes of the transmissive members corresponding to the respective lens bodies at least in the sub-scanning direction, and an end face of the transmissive member to which an end face of each lens body is opposed is thereby an end face of the corresponding transmissive member.

An image reading apparatus includes a platen on which an original is to be placed, a scanner unit configured to emit light to the original placed on the platen and receive light reflected from the original, to thereby read an image of the original, and at least one processor configured to control the scanner unit to generate an image signal representing the image based on a result of reading the image of the original by the scanner unit, wherein, in a case in which a plurality of originals are placed on the platen, the at least one processor is configured to control the scanner unit to emit the light with a first light amount in a case where the plurality of originals are originals having a first type, and emit the light with a second light amount.

An image reading apparatus includes a platen on which an original is to be placed, a scanner unit configured to emit light to the original placed on the platen and receive light reflected from the original, to thereby read an image of the original, and at least one processor configured to control the scanner unit to generate an image signal representing the image based on a result of reading the image of the original by the scanner unit, wherein, in a case in which a plurality of originals are placed on the platen, the at least one processor is configured to control the scanner unit to emit the light with a first light amount in a case where the plurality of originals are originals having a first type, and emit the light with a second light amount.

In an image forming apparatus, a first generation unit controls an image forming unit to form a first measurement image on a first sheet, controls a conveyance unit to convey the first sheet, controls the measurement unit to execute a first scan for measuring the first measurement image based on a measurement condition, adjusts the measurement condition based on a measurement result by the first scan, and controls the measurement unit to execute a second scan for measuring the first measurement image based on the adjusted measurement condition to obtain the first measurement result, and a second generation unit controls the image forming unit to form a second measurement image on a second sheet, controls the conveyance unit to convey the second sheet, and controls the measurement unit to measure the second measurement image to obtain the second measurement result.

In an image forming apparatus, a first generation unit controls an image forming unit to form a first measurement image on a first sheet, controls a conveyance unit to convey the first sheet, controls the measurement unit to execute a first scan for measuring the first measurement image based on a measurement condition, adjusts the measurement condition based on a measurement result by the first scan, and controls the measurement unit to execute a second scan for measuring the first measurement image based on the adjusted measurement condition to obtain the first measurement result, and a second generation unit controls the image forming unit to form a second measurement image on a second sheet, controls the conveyance unit to convey the second sheet, and controls the measurement unit to measure the second measurement image to obtain the second measurement result.

A line-scan imaging camera can scan an object at a near field and a far field using a low F-stop value by reading out different rows on an imager. A line LED provides a line illumination over an object. Additionally, the imaging camera captures the illumination portion of the object through an optical path that includes mirrors that allow folded optics. The optical path is longer than the distance between the object and the camera. A mirror is located close to or adjacent to the line LED to provide efficient illumination and to align the initial leg of the optical path with the line illumination.

A line-scan imaging camera can scan an object at a near field and a far field using a low F-stop value by reading out different rows on an imager. A line LED provides a line illumination over an object. Additionally, the imaging camera captures the illumination portion of the object through an optical path that includes mirrors that allow folded optics. The optical path is longer than the distance between the object and the camera. A mirror is located close to or adjacent to the line LED to provide efficient illumination and to align the initial leg of the optical path with the line illumination.