Provided is a scanner having: multiple sensor chips; an optical unit that focuses an image of an A4 document on eighteen or more sensor chips; and a generator that synthesizes images of the A4 document read by the sensor chips, and generates image data.

A lighting apparatus includes a first illumination portion and a second illumination portion. The first illumination portion and the second illumination portion respectively include a bar-like light guide whose shape of an end face of an end portion includes a part of a circle, an ellipse or a parabola, and light source elements that are provided to face the end face of the end portion of the light guide. In the light guide of the second illumination portion, light enters a determined range in which a focus of the shape of the end face of the end portion of the light guide is included. In the light guide of the first illumination portion, light enters a range that is not the determined range in which the focus of the shape of the end face of the light guide is included.

An exposure device includes a plate member, a plurality of light-emitting elements, and an optical system. The plate member extends in both a first direction and a second direction intersecting with the first direction. The light-emitting elements are disposed on the plate member side by side in the first direction. The light-emitting elements emit respective light beams in the second direction. The optical system is disposed on the plate member and faces the light-emitting elements in the second direction. The optical system performs imaging of the light beams emitted by the respective light-emitting elements.

An image-based acceptance learning device (2) learns a result of determination as to whether a planar object (1) is acceptable or defective based on at least one of a three-dimensional shape or a color on a surface of the planar object (1). The device (2) includes a surface image receiver (3) to receive an inputted two-dimensional data being image data of the surface of the planar object (1), a determination information receiver (4) to receive an inputted determination information indicating the result of determination as to whether the planar object (1) corresponding to the two-dimensional data is acceptable or defective, and a learner (5) to learn, based on the two-dimensional data and the determination information, a relevant area (1R) including the three-dimensional shape or the color on the surface in the two-dimensional data. The relevant area is a basis for the determination information.

A scanner that reads optical luminance at a field of view (FoV) includes an illuminator that provides light beams to a surface that may be located from a near field to a far field of the FoV. The illuminator can provide optical luminance that has an irradiance, which is uniform or within a certain range from the near field FoV to the far field FoV. The irradiance is achieved by adjusting the location of light emitting components and adjusting the power.

A lighting apparatus includes a first illumination portion and a second illumination portion. The first illumination portion and the second illumination portion respectively include a bar-like light guide whose shape of an end face of an end portion includes a part of a circle, an ellipse or a parabola, and light source elements that are provided to face the end face of the end portion of the light guide. In the light guide of the second illumination portion, light enters a determined range in which a focus of the shape of the end face of the end portion of the light guide is included. In the light guide of the first illumination portion, light enters a range that is not the determined range in which the focus of the shape of the end face of the light guide is included.

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.

Lens arrays of an image reading device in which lens bodies are arranged in a main scanning direction are connected with a gap therebetween. A plurality of first slit portions and a plurality of second slit portions are provided along the main scanning direction between the lens arrays and an image sensor. The first slit portion includes first light shielding plates that separate optical paths of light passed through the lens bodies. The second slit portion includes the first light shielding plates and a second light shielding plate that restricts an optical path of light passed through a lens body closest to the gap at a gap side. The position of the second light shielding plate in a direction along the optical path at the image sensor side is closer to the lens arrays than the first light shielding plates are.

Lens arrays of an image reading device in which lens bodies are arranged in a main scanning direction are connected with a gap therebetween. A plurality of first slit portions and a plurality of second slit portions are provided along the main scanning direction between the lens arrays and an image sensor. The first slit portion includes first light shielding plates that separate optical paths of light passed through the lens bodies. The second slit portion includes the first light shielding plates and a second light shielding plate that restricts an optical path of light passed through a lens body closest to the gap at a gap side. The position of the second light shielding plate in a direction along the optical path at the image sensor side is closer to the lens arrays than the first light shielding plates are.

An optical element of a lens mirror array according to an embodiment includes an incident-side lens surface, a first reflection surface, a second reflection surface, an emission-side lens surface, a first positioning surface, and a second positioning surface. The incident-side lens surface refracts and converges incident light. The first reflection surface reflects light made incident via the incident-side lens surface. The second reflection surface reflects the light reflected by the first reflection surface. The emission-side lens surface emits the light reflected by the second reflection surface. The lens mirror array is a lens mirror array in which a plurality of optical elements are arrayed in a direction orthogonal to optical axes of the incident light and the reflected light and parallel to the first positioning surface.