Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A disclosed image forming apparatus includes a reading unit including a light emitting element for emitting light to a record medium, and a light receiving element for receiving reflected light; a print data storing unit storing print data of a uniform pattern which has a color different from a color of the test pattern and is provided in an area including the test pattern, a pattern forming unit printing the test pattern on the uniform pattern after the uniform pattern is printed, a relatively moving unit moving the record medium or the reading unit relatively at a constant speed, a first detection data obtaining unit obtaining first detection data received as the reflection light while the light moves and impinges on the test pattern, and a position detecting unit providing a calculation for determining a position of a line of the test pattern to detect the test pattern.

Abstract: 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.

Abstract: An image forming apparatus which reads a test pattern formed onto a recording medium to adjust an ejection timing of liquid droplets is disclosed. The apparatus includes a reading unit; a pattern data storage unit; an image forming unit; a relative movement unit; an intensity data obtaining unit which obtains intensity data on a reflected light which is received by a light receiving unit from a scanning position of a light while the light moves over the test pattern; and a position detecting unit which applies a line position determining operation on the intensity data and detects a line position.

Abstract: An image forming apparatus is disclosed which reads a test pattern, including a reading unit, a relative movement unit, a second detected data obtaining unit which obtains one or more second detected data sets of a reflected light which is received from a scanning position of a light by a light receiving unit while the reading unit moves relatively with respect to the recording medium before the test pattern is formed, a first detected data obtaining unit which obtains one or more first detected data sets of the reflected light which is received by the light receiving unit when the light moves over the test pattern at generally the same scanning position as the scanning position while the reading unit moves relatively with respect to the recording medium after the test pattern is formed, and a signal correction unit.

Abstract: An image forming apparatus is disclosed which reads a test pattern formed by ejecting liquid droplets onto a recording medium to adjust an ejection timing of the liquid droplets. The image forming apparatus includes a reading unit; a relative movement unit; a second detected data obtaining unit; a first detected data obtaining unit; a subtraction processing unit which subtracts a value comparable to a local minimum value of first detected data sets from each of the first detected data sets and second detected data sets; and a signal correction unit which calculates a proportion of the subtracted first detected data sets relative to the subtracted second detected data sets to align a local maximum value of the first detected data sets such that it is generally constant.

Abstract: An image forming apparatus which reads a test pattern formed by ejecting liquid droplets onto a recording medium to adjust an ejection timing of the liquid droplets is disclosed. The image forming apparatus includes an image forming unit; a reading unit; a relative movement unit; an intensity data obtaining unit which obtains intensity data on a reflected light which is received from a scanning position of a light by a light receiving unit while the light moves over the test pattern; and a position detection unit which applies a line position determining operation on the intensity data in the vicinity of a point of inflection included between an upper-limit threshold value and a lower-limit threshold value, and detects a position of a line.

Abstract: 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

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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

Abstract: 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.

Abstract: 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.