A light receiving unit including: a sensor board assembly on which plural sensor tips are arrayed in a line in a longitudinal direction of the sensor board and mounted on the sensor board; and a sensor plate on which plural of the sensor board assemblies are arrayed and mounted in a line in the longitudinal direction. The sensor chips include plural pixels formed in a line in the longitudinal direction. At longitudinal ends of the sensor board assembly, the sensor chips protrude outward in the longitudinal direction from the longitudinal ends. Between the facing sensor chips of the adjacent sensor board assemblies, the facing sensor chips mounted at the longitudinal ends, the ends of the facing sensor chips are spaced at a predetermined interval. The sensor board includes convex portions, at the longitudinal ends, protruding in the longitudinal direction. The sensor chips are mounted at the convex portion.

A light receiving unit including: a sensor board assembly on which plural sensor tips are arrayed in a line in a longitudinal direction of the sensor board and mounted on the sensor board; and a sensor plate on which plural of the sensor board assemblies are arrayed and mounted in a line in the longitudinal direction. The sensor chips include plural pixels formed in a line in the longitudinal direction. At longitudinal ends of the sensor board assembly, the sensor chips protrude outward in the longitudinal direction from the longitudinal ends. Between the facing sensor chips of the adjacent sensor board assemblies, the facing sensor chips mounted at the longitudinal ends, the ends of the facing sensor chips are spaced at a predetermined interval. The sensor board includes convex portions, at the longitudinal ends, protruding in the longitudinal direction. The sensor chips are mounted at the convex portion.

A relative position identification portion is included that identifies a relative position of a personal digital assistant with respect to an image forming apparatus. The relative position identification portion acquires the relative position of the image forming apparatus and the personal digital assistant, displays, on the display portion of the personal digital assistant, an image that shows the position and the direction of the image forming apparatus seen from a user who carries the personal digital assistant and an image of the position and the direction of an original document which is arranged in the reading portion of the image forming apparatus and which is seen from the user and thereafter transmits, to the image forming apparatus, setting information based on an input operation of the operator.

A relative position identification portion is included that identifies a relative position of a personal digital assistant with respect to an image forming apparatus. The relative position identification portion acquires the relative position of the image forming apparatus and the personal digital assistant, displays, on the display portion of the personal digital assistant, an image that shows the position and the direction of the image forming apparatus seen from a user who carries the personal digital assistant and an image of the position and the direction of an original document which is arranged in the reading portion of the image forming apparatus and which is seen from the user and thereafter transmits, to the image forming apparatus, setting information based on an input operation of the operator.

An image reading device includes: a sensor module having a light source and a plurality of sensors; a white reference plate; and an image processor that generates correction data to be used for shading correction and performs the shading correction on image signals, using the correction data. The light source is configured to switch between at least a first luminous intensity and a second luminous intensity lower than the first luminous intensity. The image processor acquires intermediate data by causing the plurality of sensors to acquire an image signal of the white reference plate illuminated with the second luminous intensity, generates black correction data, based on the intermediate data, and performs the shading correction, using the black correction data, so that a density unevenness, in an image, caused by interference between image signals from the plurality of sensors.

An image reading device includes: a sensor module having a light source and a plurality of sensors; a white reference plate; and an image processor that generates correction data to be used for shading correction and performs the shading correction on image signals, using the correction data. The light source is configured to switch between at least a first luminous intensity and a second luminous intensity lower than the first luminous intensity. The image processor acquires intermediate data by causing the plurality of sensors to acquire an image signal of the white reference plate illuminated with the second luminous intensity, generates black correction data, based on the intermediate data, and performs the shading correction, using the black correction data, so that a density unevenness, in an image, caused by interference between image signals from the plurality of sensors.

An image sensor unit (60) includes: a light source part (25) that emits at least ultraviolet light in a main-scan direction to an object to be illuminated; a light condenser (32) that focuses light from the object to be illuminated; an image sensor (75) that converts the light focused by the light condenser (32), into an electric signal; and an ultraviolet cut part (65) that is disposed between the object to be illuminated and the image sensor (75), cuts off ultraviolet light in light reflected by the object to be illuminated, and allows fluorescent light to transmit therethrough. The image sensor (75) includes an ultraviolet detection part (77) that detects light in the ultraviolet light emitted from the light source part (25), the detected light having been reflected by a reflecting part but having not transmitted through the ultraviolet cut part (65).

An image sensor unit (60) includes: a light source part (25) that emits at least ultraviolet light in a main-scan direction to an object to be illuminated; a light condenser (32) that focuses light from the object to be illuminated; an image sensor (75) that converts the light focused by the light condenser (32), into an electric signal; and an ultraviolet cut part (65) that is disposed between the object to be illuminated and the image sensor (75), cuts off ultraviolet light in light reflected by the object to be illuminated, and allows fluorescent light to transmit therethrough. The image sensor (75) includes an ultraviolet detection part (77) that detects light in the ultraviolet light emitted from the light source part (25), the detected light having been reflected by a reflecting part but having not transmitted through the ultraviolet cut part (65).

Image processors are provided for respective groups formed by grouping of images, the order of which is sequential when images respectively having overlapping portions corresponding to the same portion of an object are arranged so as to be adjacent to each other, and concurrently perform processing to detect combining-position information for combining an image in a group and an image adjacent to the image without any positional displacement by image-matching. The combining-position information between images belonging to different groups is respectively transferred, via combination-information transferring paths, between the image processors and between the image processors.

Image processors are provided for respective groups formed by grouping of images, the order of which is sequential when images respectively having overlapping portions corresponding to the same portion of an object are arranged so as to be adjacent to each other, and concurrently perform processing to detect combining-position information for combining an image in a group and an image adjacent to the image without any positional displacement by image-matching. The combining-position information between images belonging to different groups is respectively transferred, via combination-information transferring paths, between the image processors and between the image processors.