Abstract:
An image reader includes a light source that irradiates light to a recording material on which an image is formed, a generation section that receives light reflected from the recording material and generates image information from the received light, and a processing section that extracts information corresponding to a window region of the recording material set in advance, as correction information, from the image information generated by the generation section when light from the light source is irradiated to the recording material on which the image is formed.
Abstract:
An image registration system for determining a relative location of a first pattern and a second pattern includes a fiducial having a fiducial origin, a first side, and a second side. A first camera captures a first fiducial image of the first side of the fiducial and the fiducial origin and a first pattern image of the first printed pattern. A second camera captures a second fiducial image of the second side of the fiducial and a second pattern image of the second printed pattern. An image registration controller processes the first fiducial image, the first pattern image, the second pattern image, and the second fiducial image to determine the relative location of the first pattern and the second pattern.
Abstract:
An apparatus to control color registration and image density and a method of calculating a color registration error. The apparatus includes registration marks formed on a transfer belt such that each of the registration marks includes a scan direction component and a slanting direction component at an angle with respect to both the scan direction and the cross-scan direction. The apparatus further includes image density marks formed on the transfer belt, having predetermined image densities, and a registration and image density sensor provided above the registration marks and the image density marks to radiate beams onto the registration marks and the image density marks. The sensor receives beams reflected from the registration marks and the image density marks to produce detection signals, and obtains registration information and image density information from the detection signals. Accordingly, X-offset, Y-offset, printing width error, and skew can be simultaneously compensated for using a single apparatus.
Abstract:
A printer for printing on a medium on an endless belt by printer heads includes: a generator generating printing data for each printer head; a detector detecting time-series data for the meandering of the medium; a generator generating correction data preventing disorder of a printed image due to the meandering; and a controller operating each printer head according to the correction and printing data, wherein the correction-data generator selects a specific difference between factors in the time when the time-series and predetermined time-series data are related and newly generates correction data corresponding to the selected factor, a replacement section replaces a factor in the time corresponding to the specific factor of the reference time-series data with the specific factor, and the time-series-data detector has a stop stopping detection of the time-series data when the absolute change value of a physical value influencing meandering is a predetermined value or less.
Abstract:
An apparatus for forming an image by use of a plurality of light beams, which are simultaneously modulated according to image signals and joined together on a photoconductive surface to form the image. The apparatus includes a photoconductive drum having the photoconductive surface and a reference mark, a pattern supplying unit which supplies image data in synchronization with detection of the reference mark associated with rotation of the photoconductive drum, and drawing systems which create moir{acute over (e )} stripes on the photoconductive surface by simultaneously drawing overlapping sets of slanted lines with the respective light beams according to the image data, and draw a reference position mark on the photoconductive surface according to the image data.
Abstract:
A lens unit (U15) includes a housing (45), an upper and a lower lens arrays (A1′, A2′), and a first and a second prisms (4A, 4B). Each of the lens arrays includes a plurality of lenses, a light-shielding member (4), and a plurality of positioning projections, all of which are integral with each other. Downwardly traveling light which enters the housing (45) through a first slit (45c) formed at an upper portion of the housing (45) is directed upward by the first prism (4A) to pass through the two lens arrays (A1′, A2′). The light is then directed downward by the second prism (4B) to exit the housing through a second slit (45d) formed at a lower portion of the housing (45).
Abstract:
In a method and apparatus for raster scanning optical output device, such as a laser printer or the like, an array of independently addressable light emitting devices, such as an array of solid state lasers, is used to control spot position on an image plane in the slow scan direction. The array is disposed such that the spots emitted from each element of the array impinge the image plane displaced in the slow scan direction from one another. The total distance between all the spots is less than the distance between fast scan direction scan lines. Only a single element of the array is operated per scan line, thus only a single spot is formed on the image plane per scan line. Control of which of the elements of the array emits a light beam per scan line allows control of the spot position in the slow scan direction for that scan line.
Abstract:
A raster scanning system is disclosed which utilizes a laser light source with a plurality of diodes, at least two of which are offset relative to each other. Either one diode or two offset diodes will be selected to scan one scan line. If two offset diodes are selected, two light beams can be generated to scan two partially overlapping paths to form a scan line. By changing the intensity of the two light beams or by selecting two different offset diodes, the scan line can be moved up or down in the sagittal plane. This concept can be used to correct the wobble of a scan line in which case, either one diode or two offset diodes will be selected to scan one scan line in its correct position. Also, the same concept can be used to correct a bow of a scan line in which case, either one diode or two offset diodes will be selected for each pixel to correct the bow in accordance with a pre-defined correction data for that pixel which is stored in a memory.
Abstract:
A recorder has a beam generator for generating a beam to form a dot image on a record medium. The beam generator has first and second beam generation sources to generate first and second beams and forms each dot by using both of the first and second beams.
Abstract:
A microfilm display device is responsive to a film address signal and controlled by a microprocessor to locate a desired film and select a film image for display on a cathode-ray terminal. The film image is converted to a video signal for display on the terminal. The video signal is used for fine positioning of the raster on a flying spot scanner which illuminates the film.