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.

Disclosed are a projection device and a spatial imaging method. The projection device includes: an optical fiber scanner array; a light source located on an incident light path of the optical fiber scanner array; and an adjustment and control module assembly configured to couple, according to a virtual scene to be displayed, light emitted by the light source into the optical fiber scanner array, and to control the optical fiber scanner array to project pencil beams to a plurality of virtual object points corresponding to the virtual scene and located in space, such that multiple pencil beams projected to each virtual object point form a bundle of emitting light beams.

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.

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, and a direction corresponding to the 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.

An image reading device includes light guides (5, 6) that emit light to an object to be read, a lens body (8) that condenses reflected light, a light receiver (13) that receives the reflected light, a sensor board (24) on which is mounted the light receiver (13), a lens holder (11), and a housing (9) that houses or holds these components. The lens holder (11) includes a holder bottom (11g), light guide positioners (11a, 11b) and lens body holders (11e, 11f). In the lens holder (11), the lens body (8) is attached between the lens body holders (11e, 11f), the sensor board (24) is attached to the holder bottom (11g) such that the light receiver (13) aligns with an optical axis of the lens body (8), and the light guides (5, 6) are attached to the light guide positioners (11a, 11b). A surface of each light guide positioner (11a, 11b) that faces the corresponding light guide (5, 6) to be attached has at least a portion having a same shape a s a shape of a surface of the light guide.

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.

A scanner includes an image read unit including a linear image sensor having a length in a main scanning direction, a compensation value calculation unit to compare data read from a main scanning reference pattern including a plurality of main scanning sections arranged in the main scanning direction with data of the main scanning reference pattern that is previously stored, and to calculate a plurality of main scanning scale compensation values respectively corresponding to the plurality of main scanning sections, and an image processing unit to compensate for distortion in the main scanning direction by dividing an image read from the document into a plurality of main scanning image areas respectively corresponding to the plurality of main scanning sections and applying the plurality of main scanning scale compensation values respectively to the plurality of main scanning image areas.

An image reading device includes light guides (5, 6) that emit light to an object to be read, a lens body (8) that condenses reflected light, a light receiver (13) that receives the reflected light, a sensor board (24) on which is mounted the light receiver (13), a lens holder (11), and a housing (9) that houses or holds these components. The lens holder (11) includes a holder bottom (11g), light guide positioners (11a, 11b) and lens body holders (11e, 11f). In the lens holder (11), the lens body (8) is attached between the lens body holders (11e, 11f), the sensor board (24) is attached to the holder bottom (11g) such that the light receiver (13) aligns with an optical axis of the lens body (8), and the light guides (5, 6) are attached to the light guide positioners (11a, 11b). A surface of each light guide positioner (11a, 11b) that faces the corresponding light guide (5, 6) to be attached has at least a portion having a same shape a s a shape of a surface of the light guide.

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.

Disclosed are a projection device and a spatial imaging method. The projection device includes: an optical fiber scanner array; a light source located on an incident light path of the optical fiber scanner array; and an adjustment and control module assembly configured to couple, according to a virtual scene to be displayed, light emitted by the light source into the optical fiber scanner array, and to control the optical fiber scanner array to project pencil beams to a plurality of virtual object points corresponding to the virtual scene and located in space, such that multiple pencil beams projected to each virtual object point form a bundle of emitting light beams.