Recording sheet and image recording apparatus
View Patent ↗There is disclosed a recording sheet for use in an image recording apparatus which forms an image by a recording head, the recording sheet has a pattern for measurement in which a correction amount for correction of a positional shift of a recorded dot recorded by the recording head is measurable based on a positional relationship with an image for measurement formed by the recording head, and accordingly it is possible to correct arrangement of recorded dots and to record an image without any distortion.
1. An image recording apparatus comprising:
a recording head section which achieves an expanded recording width by recording a plurality of interconnected images;
a mark identification section which identifies whether or not an identification mark is present on a recording sheet in the image recording apparatus, and which identifies, based on identification of the identification mark: (i) whether or not a pattern for measurement is provided on the recording sheet, and (ii) a type of the pattern for measurement if it is determined that the pattern for measurement is provided on the recording sheet;
a measurement image generation section which produces image data for measurement;
an image data selection section which selects the image data for measurement to be recorded on the recording sheet in accordance with an identification result of the mark identification section, such that the image data for measurement is recorded on the pattern for measurement on the recording sheet, when the pattern for measurement is provided on the recording sheet;
a peak interval calculation section which calculates a shift amount based on a positional relationship between the image data for measurement recorded on the recording sheet and the pattern for measurement provided on the recording sheet; and
a printing timing correction amount calculation section which corrects a position of a recorded image formed by the recording head section based on the shift amount calculated by the peak interval calculation section.
2. An image recording apparatus comprising:
a recording head section which achieves an expanded recording width by recording a plurality of interconnected images;
a mark identification section which identifies whether or not an identification mark is present on a recording sheet in the image recording apparatus, and which identifies, based on identification of the identification mark: (i) whether or not a pattern for measurement is provided on the recording sheet, and (ii) a type of the pattern for measurement if it is determined that the pattern for measurement is provided on the recording sheet;
a measurement image generation section which produces image data for measurement;
an image data selection section which selects the image data for measurement to be recorded on the recording sheet in accordance with an identification result of the mark identification section, such that the image data for measurement is recorded on the pattern for measurement on the recording sheet, when the pattern for measurement is provided on the recording sheet;
an image reading section including a line sensor which performs a scanning operation in a direction intersecting obliquely with at least one of: (i) a line constituting at least a part of the image for measurement, and (ii) a line constituting at least a part of the pattern for measurement;
an image rotation conversion section which rotates image data read by the image reading section;
an image data interpolation enlargement section which performs interpolation on each row of the image data rotated by the image rotation conversion section to increase a number of data items;
an average value calculation section which calculates an average value of each column of data output from the image data interpolation enlargement section; and
a peak interval calculation section which calculates a shift amount from a difference between a peak position of a one-dimensional data string which is output by the average value calculation section based on image data obtained by reading the pattern for measurement, and a peak position of another one-dimensional data string which is output by the average value calculation section based on image data obtained by reading the image data for measurement.
3. An image recording apparatus comprising:
a recording head section which comprises a plurality of recording heads and which achieves an expanded recording width by recording a plurality of interconnected images with the plurality of recording heads, respectively; and
a measurement image generation section which produces an image for measurement which comprises a plurality of lines extending along a line direction of the plurality of recording heads, wherein all of the lines have a same fixed first end position, and wherein respective different ones of the lines have respective different second end positions.
4. The image recording apparatus of claim 3 , wherein the second end position of the lines changes every line.
5. The image recording apparatus of claim 3 , wherein the second end position of the lines changes every several lines.