Abstract:
Reference images on the respective surfaces of a reference document transported on a transportation path are read out by a first image reading section and a second image reading section, respectively. As a result a first reference readout image and a second reference readout image are acquired. in accordance with the difference between the changes in the sub-scanning direction in the first reference readout image and the changes in the sub-scanning direction in the second reference readout image, the reading cycle of the first image reading section X1 and the reading cycle of the second image reading section X2 are set. This makes it possible to equalize the magnifications of the respective images on the front and back sides of the document, even if the speeds of the document at the times of passing through readout positions for the front and back sides change over time, on account of the wear of a transportation roller.
Abstract:
A photosensor comprising a photoconductive layer provided on a substrate. The layer contains amorphous silicon. At least a portion of the layer has a refractive index varying continuously through the thickness of the layer. The refractive index of the layer is 3.2 or less at a wavelength of 6,328 .ANG. in the vicinity of the surface of the substrate. A pair of electrodes are provided in electrical contact with the photoconductive layer. A photoreceptor is also provided, part of which is constituted by the spacing between the electrodes of the pair.
Abstract:
A picture reader in which frame position data showing the positions of left and right ends of frames are generated by controlling a CCD line sensor (5) and film carrying roller (103) so that a plurality of pictures recorded on an optical film (1) can be successively read at a prescribed sampling rate from the latest frame at pre-scanning time. In the course of main scanning, the picture reader controls the read starting timing and read ending timing of the sensor (5), which are controlled based on the frame position data obtained at the pre-scanning time, at the time of controlling the sensor (5) and a film carrier (100) so that the plurality of pictures recorded on the optical film can be successively read at a sampling rate higher than the above-mentioned prescribed sampling rate from the oldest frame. As a result, the picture reader can accurately obtain the picture data of the pictures in the frames without causing any positional deviation. Since the prescanning is made at a lower sampling rate, the frame position data can be obtained in a short time.
Abstract:
An image sensor includes a housing which receives heat of a circuit board, and a light source which is supported in the housing and radiates light toward a document. The light source is an EL light-emitting element including a light emission section which emits light by organic electroluminescence. The EL light-emitting element extends in a line shape along a scanning direction. A thermal diffusion layer is interposed between the EL light-emitting element and the housing.
Abstract:
An image reading apparatus includes a sheet conveyance path on which a sheet of a document from which an image is to be read is conveyable; a light source that emits light to be irradiated on the sheet; a conductive unit through which heat generated at the light source is transferable; and a heat radiating unit that forms a part of the sheet conveyance path, through which the heat transferred from the light source to the conductive unit is propagable, and that radiates the heat propagated from the conductive unit to air flowing in the sheet conveyance path when the sheet is being conveyed.
Abstract:
An optical scanning apparatus is disclosed that includes a light source unit having plural main light sources that are two-dimensionally arranged in the main scanning direction and the sub scanning direction, and plural sub light sources that are arranged between rows of the main light sources aligned in the main scanning direction. The optical scanning apparatus also includes an optical system configured to scan light emitted from the light source unit on a scanning object to form an image on the scanning object, and a control apparatus configured to adjust a main scanning direction image position by controlling two of the main light sources that are juxtaposed to each other with respect to the main scanning direction and adjust a sub scanning direction image position by controlling a main light source and a sub light source that are adjacent to each other.