Patent application number | Description | Published |
20090180156 | Image reading apparatus and image forming apparatus - An image reading apparatus is disclosed that includes a contact glass on which a document is placed; an imaging device configured to image a document image based on light reflected from the document through the contact glass; plural line image sensors arranged along a main scanning direction at positions where the document image is imaged and configured so that end portions of the line image sensors adjacent to each other similarly read same image data imaged at an overlapping area; a transmitted light quantity reduction unit disposed in the overlapping area on the contact glass and configured to reduce transmitted light quantity of a light transmitted through the contact glass; and a signal correction device configured to correct the signal intensity of the image data similarly read by the line image sensors adjacent to each other. | 07-16-2009 |
20090195843 | Image reading apparatus, document reading apparatus, and image forming apparatus - An image reading apparatus is disclosed that includes plural line image sensors partially overlapped with each other in an overlapped reading portion, the image reading apparatus characterized by: plural light sources disposed so as to face the overlapped reading portion; a light source turn-on unit sequentially and independently turning on the light sources; an optical unit converging each light emitted from the light sources onto the overlapped reading portion; and a position shift detecting unit detecting a position shift of a reading position of the line image sensors in the overlapped reading portion based on data of the overlapped reading portion. | 08-06-2009 |
20090316164 | Image forming apparatus - An image forming apparatus is disclosed that includes a recording head having a plurality of nozzles and scanning in forward and backward scanning directions to form dot images on the recording medium, an imaging unit imaging an image on the recording medium, a detection unit detecting a positional shift amounts of the dot images and inclination amounts of the recording head based on calibration image data obtained by imaging two first marks and two second marks in a single view by the imaging unit, and a correction unit correcting a drive of the recording head based on the detected positional shift amounts and the inclination amounts of the recording head. | 12-24-2009 |
20110007112 | Recording apparatus and non-transitory computer-readable recording medium storing a recording program - A recording apparatus includes a carriage; a first head group including a recording head and disposed on the carriage; and a second head group including a recording head and disposed on the carriage adjacent the first head group in a staggered manner with respect to a sub-scan direction. The carriage is configured to move in a main scan direction in order to record an image on a recording medium. The recording apparatus further includes a forming unit configured to form plural test patterns including a first pattern formed by the recording head of the first head group and a second pattern formed by the recording head of the second head group. The test patterns are spaced apart from one another in the sub-scan direction. The position of the second pattern relative to the first pattern in the sub-scan direction is varied successively from one test pattern to another. | 01-13-2011 |
20110056808 | CONVEYING APPARATUS, IMAGE FORMING APPARATUS INCLUDING CONVEYING APPARATUS, AND CONVEYING METHOD. - A conveying apparatus that rotates a roller and conveys an object, the conveying apparatus including: a roller driving unit that rotates the roller; a first operation unit that operates a rotation amount of the roller corresponding to a target movement amount of the object, on the basis of the target movement amount and information of a roller diameter, and quantizes the rotation amount; a random number generating unit that generates a random number; a second operation unit that operates a corrected rotation amount of the roller obtained by correcting the rotation amount, on the basis of the random number generated by the random number generating unit, a quantization error obtained by the first operation unit and a quantization method; and a driving control unit that controls driving of the roller according to the corrected rotation amount. | 03-10-2011 |
20110063352 | Recording apparatus and control method therefor - A disclosed recording apparatus includes a carriage having a recording head including nozzles, a moving unit configured to move the carriage, a platen including plural plate members connected in a carriage traveling direction to support a recording medium, a transferring unit to transfer the recording medium in a direction perpendicular to the carriage traveling direction, a recording control unit to record patterns at predetermined positions to form a carriage traveling direction pattern array plural times in a transferring direction of the transferring unit by changing relative recording times for recording the carriage traveling direction pattern array in forward and backward traveling directions, a determination unit to determine ink ejecting times at the predetermined positions, and a time control unit to linearly interpolate between the determined ink ejecting times at the predetermined positions to control ink ejecting times for intervals between the predetermined positions based on the obtained linear interpolation. | 03-17-2011 |
20110063356 | Conveying distance control device, recording apparatus, conveying distance control method, and storage medium - A conveying distance control device includes a conveying roller; a first detecting unit detecting rotational positions of the conveying roller; a line sensor sequentially detecting marks arranged on a test chart; a calculation unit, and a control unit. The calculation unit calculates a skew angle between a line passing through positions of a first mark and a second mark and a conveying direction of the conveying roller. The control unit obtains conveying distance errors indicating differences between corrected conveying distances not including errors caused by the skew angle and theoretical conveying distance of the marks in association with the rotational positions of the conveying roller, calculates a correction value for correcting a conveying distance of the conveying roller based on relationships between the conveying distance errors and the rotational positions of the conveying roller, and controls the conveying distance of the conveying roller based on the correction value. | 03-17-2011 |
20110148971 | Feed control apparatus, recording apparatus, control method, and recording medium - A disclosed feed control apparatus includes a feed roller; a first detection unit detecting a rotational position of the feed roller; a sensor detecting plural marks arranged on a test chart; a difference calculation unit that calculates a difference between actual and theoretical positional information of a Nth mark when the feed roller rotates one revolution; a correction feeding amount calculation unit that calculates correction feeding amounts of the marks based on the difference and actual feeding amounts of the marks; an error calculation unit that calculates errors between the correction feeding amounts and theoretical feeding amounts by matching them to the corresponding rotational positions of the feeding roller; and a feeding amount control unit that controls the feeding amount based on a relationship between the rotational positions of the feeding roller and the corresponding errors. | 06-23-2011 |
20110205275 | Recording device and control method therefor - A recording device having a recording head including a nozzle line that eject ink from nozzles arranged in a transfer direction of a recording medium, a carriage, a moving device that moves the carriage forward and backward, a transfer device that transfers the recording medium, an ejection control device that forms a detection pattern by ejecting the ink, a two-dimensional sensor that detects the detection pattern, an analyzer that analyzes the image data of the detection pattern, and a detection device that detects misalignment of the printed dots, the ejection control device having a first dot group formation device that forms a first dot group, a second dot group formation device that forms a second dot group, and a third dot group formation device that forms a third dot group, the detection pattern being formed of the first dot group, the second dot group, and the third dot group. | 08-25-2011 |
20110211031 | ROLL PAPER CONVEYING APPARATUS, INKJET PRINTER, AND ROLL PAPER CONVEYING METHOD - A movable member encoder is used to detect the position of a movable member, and a correction value calculator calculates a correction value corresponding to the amount of displacement of the movable member from a reference position and the integration of the amount of displacement. The correction value calculated by the correction value calculator is then used in correcting a voltage instruction value output from a feed motor controller to a feed motor. | 09-01-2011 |
20110228027 | IMAGE FORMING APPARATUS AND METHOD FOR DETECTING POSITION DEVIATION - An image forming apparatus includes a photoconductor drum, a first printer head that forms a first pattern on the photoconductor drum and has a first end part, a second printer head that forms second and third patterns on the photoconductor drum and has a second end part that overlaps the first end part in a main scanning direction, a detection sensor that detects the densities of first and second test patterns formed at an area of the photoconductor drum at which the first and second end parts overlap, the first test pattern being formed by combining the first and second patterns, the second test pattern being formed by combining the first and third patterns, and a determination part that determines a deviation direction between the first and second printer heads by comparing the densities detected by the detection sensor. | 09-22-2011 |
20110298854 | Recording apparatus and control method therefor - A recording apparatus includes a carriage having a recording head including nozzles, a moving unit moving the carriage, a platen including plate members connected in a carriage traveling direction to support a recording medium when the nozzles eject ink onto the recording medium, a transferring unit transferring the recording medium in a transferring direction perpendicular to the carriage traveling direction, a recording control unit recording patterns at predetermined positions in the carriage traveling direction while moving the carriage in forward and backward traveling directions to form a carriage traveling direction pattern array, a determination unit determining ink ejecting times at the predetermined positions in the carriage traveling direction, and a time control unit to linearly interpolate between the determined ink ejecting times at the predetermined positions in the carriage traveling direction to control ink ejecting times for intervals between the predetermined positions based on a result of the linear interpolation. | 12-08-2011 |
20120069411 | IMAGE CAPTURING DEVICE AND RECORDING APPARATUS - An image capturing device includes: a housing; a reference pattern used for color measurement and arranged in the housing; an image capturing element that captures an image of the reference pattern in a first area and an image of an object in a second area of the image capturing area; an image forming element causing the image of the reference pattern and the image of the object to be formed on the image capturing element by being arranged on a first optical path between the image capturing element and the reference pattern and a second optical path between the image capturing element and the object; and an optical member that guides any one of the images of the reference pattern and the object formed by the image forming element so that the images are to be formed on an element surface of the image capturing element. | 03-22-2012 |
20120236308 | COLOR MEASURING DEVICE, IMAGE CAPTURING DEVICE, IMAGE FORMING APPARATUS, COLOR MEASUREMENT METHOD, AND COMPUTER PROGRAM PRODUCT - A color measuring device includes a storage unit configured to store therein colorimetric values corresponding respectively to colors constituting a reference chart in a predetermined color space that is device-independent; an image capturing unit configured to capture the reference chart and a subject for color measurement simultaneously to acquire RGB values of the reference chart and RGB values of the subject; a search unit configured to search for RGB values of four points corresponding to vertices of a polyhedron in the reference chart, the polyhedron including a specified RGB value of the subject in an RGB color space; a calculating unit configured to calculate a linear transformation matrix for converting the RGB values of the four points into the corresponding colorimetric values; and a conversion unit configured to convert the specified RGB value into a corresponding colorimetric value in the predetermined color space based on the linear transformation matrix. | 09-20-2012 |
20130027720 | COLOR MEASURING DEVICE, IMAGE FORMING APPARATUS, IMAGE FORMING METHOD, AND COMPUTER-READABLE STORAGE MEDIUM - A color measuring device include an illuminating unit configured to illuminate an image-capturing range; an image capturing unit configured to capture an image of the image-capturing range containing a patch and an object; an extracting unit configured to extract image data of a surrounding region in a predetermined color from the image data output by the image capturing unit; an interpolating unit configured to interpolate at least one target region that is at least one of regions of the patch and the object based on the image data of the surrounding region; a storage unit configured to store therein, as correction data, interporting data that is interporated; a correcting unit configured to correct the image data output by the image capturing unit by using the correction data; and a calculating unit configured to calculate a colorimetric value of the object based on the corrected image data. | 01-31-2013 |
20130027721 | COLOR MEASURING DEVICE, IMAGE FORMING APPARATUS AND COMPUTER PROGRAM PRODUCT - A color measuring device includes: an image capturing unit; a reference chart; a light quantity control unit; a generating unit; a correction unit; and a calculating unit. The image capturing unit outputs image data of an image-capturing range. The reference chart has multiple patches of different densities. The light quantity control unit controls the illumination unit. The generating unit generates first correction data based on image data of the multiple patches illuminated by a first light quantity and generates second correction data based on image data of the multiple patches illuminated by a second light quantity. The correction unit corrects image data of the reference chart and a color measurement target, using the first correction data or the second correction data. The calculating unit calculates color measurement value of the color measurement target based on the corrected image data of the reference chart and the color measurement target. | 01-31-2013 |
20130135484 | IMAGE CAPTURING UNIT, COLOR MEASURING DEVICE, IMAGE FORMING APPARATUS, COLOR MEASURING SYSTEM AND COLOR MEASUREMENT METHOD - An image capturing unit includes a sensor unit that image-captures a predetermined area including a subject; and a reference chart unit that is arranged in the predetermined area and captured with the subject by the sensor unit. | 05-30-2013 |
20130208289 | COLOR MEASURING DEVICE, IMAGE FORMING APPARATUS, COLOR MEASURING METHOD, AND COLOR MEASURING SYSTEM - A color measuring device includes a unit configured to calculate a reference-value matrix for converting imaged reference RGB value of a reference color patch a reference colorimetric value of the reference color patch; a unit configured to convert a color-measurement RGB value of a color measurement object into an imaged colorimetric value of the color measurement object by using the corresponding reference-value matrix; a unit configured to select reference color patches of which the reference colorimetric values each have a close distance from the imaged colorimetric value in the predetermined color space; a unit configured to select, as selection RGB values, the imaged reference RGB values of the selected patches; a unit configured to calculate a selection-RGB-value matrix for converting the selection RGB values into the reference colorimetric values; and a unit configured to convert the color-measurement RGB value into a colorimetric value by using the selection-RGB-value matrix. | 08-15-2013 |
20130229671 | IMAGE CAPTURING UNIT, COLOR MEASURING DEVICE, IMAGE FORMING DEVICE, COLOR MEASURING SYSTEM, AND COLOR MEASURING METHOD - An image capturing unit includes a sensor section that images a predetermined range including a subject; a reference chart section that is imaged by the sensor section with the subject; and an illumination light source that illuminates the subject and the reference chart section. The illumination light source is arranged at a position where a mirror reflection region that mirror reflects light entering from the illumination light source to the sensor section is outside a region of the subject and the reference chart section. | 09-05-2013 |
20130242319 | IMAGING UNIT, COLOR MEASURING DEVICE, IMAGE FORMING APPARATUS, COLOR MEASURING SYSTEM, AND COLOR MEASURING METHOD - An imaging unit includes a frame having an opening; a sensor unit that captures, via the opening, a subject located outside the frame; a reference chart unit that is arranged on the frame and is captured by the sensor unit together with the subject; and a cover member that covers the opening. | 09-19-2013 |
20130242320 | IMAGE CAPTURING UNIT, COLOR MEASURING DEVICE, IMAGE FORMING APPARATUS, COLOR MEASURING SYSTEM, AND COLOR MEASUREMENT METHOD - An image capturing unit includes: a sensor unit that captures an image of a predetermined area including an image capture object; a reference chart portion that is disposed in the predetermined area and an image of which is captured together with an image of the image capture object by the sensor unit; an illumination light source that illuminates the image capture object and the reference chart portion; and a specular reflection preventing member that prevents that specular reflection light of light emitted from the illumination light source enters the sensor unit. | 09-19-2013 |
20130242321 | IMAGE CAPTURING UNIT, COLOR MEASURING DEVICE, IMAGE FORMING DEVICE, COLOR MEASURING SYSTEM, AND COLOR MEASURING METHOD - An image capturing unit includes a sensor unit that captures a predetermined area including a subject; a reference chart that is arranged in the predetermined area and captured together with the subject by the sensor unit; an optical path length changing member that is arranged on an optical path extending from the subject to the sensor unit and is capable of changing a length of the optical path. | 09-19-2013 |
20130242361 | IMAGE CAPTURING DEVICE, COLOR MEASURING DEVICE, COLOR MEASURING SYSTEM, IMAGE FORMING APPARATUS, AND COLOR MEASURING METHOD - An image capturing device includes a sensor unit that captures a predetermined range including a subject; a reference chart that is captured by the sensor unit together with the subject; an illumination light source that illuminates the subject and the reference chart; a lens member including one or more lenses arranged in an optical path of reflected light extending from the subject and the reference chart to the sensor unit; and a lens moving unit that moves at least one lens of the lens member so as to change a position thereof in a direction along the optical path. | 09-19-2013 |
20130258368 | COLOR MEASURING DEVICE, IMAGE FORMING APPARATUS, COLORIMETRIC SYSTEM AND COLOR MEASURING METHOD - A color measuring device includes a housing; a sensor unit configured to capture an image of a region, the sensor unit being held to the housing; an illumination light source configured to illuminate the region, the illumination light source being held to the housing; a detecting unit configured to detect a distance between predetermined two points from image data of the region obtained by the sensor unit; a correcting unit configured to correct the image data including a subject whose color is to be measured according to a ratio of the detected distance to a reference distance; and a calculating unit configured to calculate a colorimetric value of the subject based on the corrected image data. | 10-03-2013 |
20130258369 | IMAGE CAPTURING DEVICE, COLOR MEASURING DEVICE, COLOR MEASURING SYSTEM, AND IMAGE FORMING APPARATUS - An image capturing device includes an image capturing unit, a moving unit, a detector, and a determiner. The image capturing unit includes an optical transmission member; and a sensor capturing an image of the subject via the optical transmission member. The moving unit moves the image capturing unit in an optical axis direction of the sensor. The detector detects a contamination from first and second images. The first and second images are captured by the sensor when the image capturing unit is located at first and second positions in the optical axis direction, respectively. The second position is spaced away from the subject than the first position in the optical axis direction. The determiner determines that a contamination is deposited on the optical transmission member when a difference in the number of pixels in which a contamination is detected between the first and second images is less than a threshold. | 10-03-2013 |
20140218754 | IMAGE CAPTURING DEVICE AND RECORDING APPARATUS - An image capturing device includes: a housing; a reference pattern used for color measurement and arranged in the housing; an image capturing element that captures an image of the reference pattern in a first area and an image of an object in a second area of the image capturing area; an image forming element causing the image of the reference pattern and the image of the object to be formed on the image capturing element by being arranged on a first optical path between the image capturing element and the reference pattern and a second optical path between the image capturing element and the object; and an optical member that guides any one of the images of the reference pattern and the object formed by the image forming element so that the images are to be formed on an element surface of the image capturing element. | 08-07-2014 |
20150070737 | GLOSSINESS DETERMINING DEVICE, COLOR MEASURING DEVICE, IMAGE FORMING APPARATUS, AND GLOSSINESS DETERMINATION METHOD - A glossiness determining device includes: a light source; a two-dimensional sensor that receives reflected light containing a specular reflection component of a subject illuminated by the light source, and outputs an image of the subject; and a determining unit that determines glossiness of the subject by using a saturated image, which is the image of the subject output by the two-dimensional sensor and in which pixel values of a partial area are saturated. | 03-12-2015 |
20150085305 | IMAGE CAPTURING DEVICE, COLOR MEASURING DEVICE, COLOR MEASURING SYSTEM, AND IMAGE FORMING APPARATUS - An image capturing device includes an image capturing unit, a moving unit, a detector, and a determiner. The image capturing unit includes an optical transmission member; and a sensor capturing an image of the subject via the optical transmission member. The moving unit moves the image capturing unit in an optical axis direction of the sensor. The detector detects a contamination from first and second images. The first and second images are captured by the sensor when the image capturing unit is located at first and second positions in the optical axis direction, respectively. The second position is spaced away from the subject than the first position in the optical axis direction. The determiner determines that a contamination is deposited on the optical transmission member when a difference in the number of pixels in which a contamination is detected between the first and second images is less than a threshold. | 03-26-2015 |