Provided is an image reading apparatus including: an image reading unit configured to output image data representing an image read from an original; and an image control board configured to acquire the image data by controlling an operation of the image reading unit. When a shading error occurs, the image control board determines a part that has caused the shading error by determining whether or not a power supply voltage is being normally supplied to the image reading unit, determining whether or not a light source is normally emitting light, determining whether or not a memory is normally operating, and determining whether or not data output from the image reading unit is normally stored in the memory.

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.

Provided are a reader and an ink-jet recording device with which it is possible to maintain the accuracy of reading a document continuously for a longer time. The reader is provided with a detection unit for detecting light from the surface of an object to be read and a housing for shutting the detection unit tight, the housing having a window for allowing the light from the surface of the object to be read to enter the inside via a light permeable member, the window being provided at a position in the housing more separate from the surface of the object to be read than is a nearest surface facing the surface of the object to be read in the shortest distance.

A document platen on which a document is placed; and a reading sensor having a light source for irradiating the document with light, are provided, and the reading sensor performs first scanning for irradiating the document with light at a first light quantity, and then performs second scanning for irradiating the document with light at a second light quantity greater than the first light quantity.

Aspects and embodiments are generally directed to optical systems, receivers, and methods. In one example, an optical receiver includes a plurality of fused fiber optic bundles, at least a first fused fiber optic bundle of the plurality of fused fiber optic bundles positioned to collect optical radiation from a scene, a multi-mode fiber optic cable coupled to each fused fiber optic bundle of the plurality of fused fiber optic bundles, the multi-mode fiber optic cable configured to propagate the collected optical radiation from each of the plurality of fused fiber optic bundles along a length of the multi-mode fiber optic cable, and a photo-detector coupled to the multi-mode fiber optic cable and configured to receive the collected optical radiation. A field of view of each fused fiber optic bundle of the plurality of fused fiber optic bundles may collectively define a substantially omnidirectional field of view of the photo-detector.

A reading module includes a light source, an optical system for forming an image of reflection light from a document illuminated by the light source, and a sensor including a plurality of sensor chips to convert the image light formed by the optical system into an electric signal. The optical system includes a mirror array including a plurality of reflecting mirrors connected in the main scanning direction, first aperture stops each of which adjusts light amount of the image light reflected from each of the reflecting mirrors, second aperture stops each extending from the opening edge of the first aperture stop toward the mirror array, first light shielding walls each of which extends from a boundary between the sensor chips toward the first aperture stops, and second light shielding walls extending from both sides in the main scanning direction of the first aperture stop toward the sensor chips.

A reading module includes a light source, an optical system for forming an image of reflection light from a document illuminated by the light source, and a sensor including a plurality of sensor chips to convert the image light formed by the optical system into an electric signal. The optical system includes a mirror array including a plurality of reflecting mirrors connected in the main scanning direction, first aperture stops each of which adjusts light amount of the image light reflected from each of the reflecting mirrors, second aperture stops each extending from the opening edge of the first aperture stop toward the mirror array, first light shielding walls each of which extends from a boundary between the sensor chips toward the first aperture stops, and second light shielding walls extending from both sides in the main scanning direction of the first aperture stop toward the sensor chips.

Provided is an optical apparatus including a line sensor that includes plural detection portions arranged in a lateral direction, the detection portions including plural light-receiving elements arranged in a line shape in a longitudinal direction, a direction corresponding to the and lateral direction being set as a first direction and a direction corresponding to the longitudinal direction being set as a second direction in a surface perpendicular to an optical axis of light which forms an image on the line sensor, and a reduction optical system that reflects light from an original document and guides the reflected light to the detection portion, and includes plural curved-surface mirrors that have curvatures in the first direction and the second direction as a whole.