An image reading apparatus includes an original stacking portion, an original feeding portion, an image reading portion, a shading operation portion, and a receiving portion. The shading operation portion acquires a shading correction value by causing the image reading portion to read a white reference member with a predetermined reading resolution when an original is stacked on the original stacking portion. When a resolution change instruction is received before reading of the original is started, depending on the resolution change instruction, the shading operation portion acquires a shading correction value by causing again the image reading portion to read the white reference member with a changed reading resolution.

In a case where a temperature detected by a detector is greater than a threshold, one or more processors controls a light source not to emit light and stops conveyance of a document by a conveyance unit. In a case where a predetermined amount of time has elapsed from when the one or more processors controls the light source not to emit the light, the one or more processors controls the light source to emit the light and starts conveyance of the document by the conveyance unit, regardless of a detection result of the detector.

An image reading device includes a glass having a document reading surface along which a document moves; an image reading unit movable in a sub-scanning direction and including a light emitting portion that emits light to illuminate the document with the light and a light receiving portion that receives the light reflected by the document, the image reading unit reading the document that moves along the document reading surface at a predetermined document reading position; and a light emission control unit that causes the light emitting portion to emit the light so that the light enters the glass through a side surface that crosses the document reading surface in an operation different from an operation in which the image reading unit reads the document.

An image forming apparatus includes an optical sensor configured to detect reflected light from a detection image formed on the transfer member. The optical sensor includes a light emitting element configured to emit light for irradiating the detection image at a predetermined angle of incidence, a first light receiving element arranged at a position at which diffused reflected light from the detection image is received at a first angle of reflection, and a second light receiving element arranged at a position at which the diffused reflected light from the detection image is received at a second angle of reflection.

A label modification system is disclosed herein. The label modification system may determine a physical configuration of a rewriteable label. The label modification system may select a laser containment structure that is associated with the physical configuration. The laser containment structure may be one of a plurality of laser containment structures that are accessible to a placement device. The label modification system may cause the placement device to position the laser containment structure in association with the rewriteable label to form a sealed enclosure that includes a laser printhead. The label modification system may perform, based on a seal status associated with the laser containment structure and the rewriteable label, an action associated with the rewriteable label.

An image reading apparatus includes: a reading unit, which is configured to read an original placed on an original table in a main scanning direction by irradiating the original with light; and a sub-scanning size detector, which is configured to detect presence or absence of the original on the original table by radiating invisible rays. When the platen cover forms an angle of equal to or smaller than a first angle with respect to the original table, the image reading apparatus determines a size of the original in a sub-scanning direction in accordance with a detection result acquired from the sub-scanning size detector. When the platen cover forms an angle equal to or smaller than a second angle, which is smaller than the first angle, with respect to the original table, the image reading apparatus determines a size of the original in the main scanning direction.

The reading device of the present disclosure includes a housing, a first irradiation part, an imaging device, and a first diffusion part. The housing has an opening in an upper portion with a transparent reading window member. The first irradiation part emits an infrared light. The imaging device is disposed on a bottom portion such that an optical axis is directed to a reading window member. The first diffusion part is disposed on a left side wall connecting the upper and bottom portions. The first diffusion part diffuses the infrared light. The first diffusion part is made up of a light-transmitting first diffusion plate and a light-transmitting second diffusion plate. The first diffusion plate is disposed on the bottom surface side and inclined toward the upper portion. The second diffusion plate is disposed on the upper surface side and inclined toward the bottom portion.

The image reading apparatus includes a reading unit, a reading region in which a first region in which a member that suppresses entry of external light is disposed and a second region other than the first region are arranged in a main scanning direction of the reading unit, and a controller, wherein the controller calculates intensity of external light in the second region based on a reading value in the reading region, wherein the reading value is obtained by the reading unit, determines whether the intensity of the external light exceeds a threshold value, performs a first shading correction on a reading value of a document transported to the reading region when the intensity of the external light exceeds the threshold value, and performs a second shading correction on the reading value of the document when the intensity of the external light does not exceed the threshold value.

An image reading device includes a glass having a document reading surface along which a document moves; an image reading unit movable in a sub-scanning direction and including a light emitting portion that emits light to illuminate the document with the light and a light receiving portion that receives the light reflected by the document, the image reading unit reading the document that moves along the document reading surface at a predetermined document reading position; and a light emission control unit that causes the light emitting portion to emit the light so that the light enters the glass through a side surface that crosses the document reading surface in an operation different from an operation in which the image reading unit reads the document.

An optical device includes: a lens member including a plurality of lenses arranged such that optical axes of the lenses are substantially parallel to one another; and a plurality of column parts that are each provided along the optical axis of each lens among the plurality of lenses and each allow light to pass through inside, each column part having an outer periphery through which light is less likely to pass from inside to outside the column part than through an end portion of the column part in a direction along the optical axis, the plurality of column parts being integrally formed and disposed to face the lens member.