Recording apparatus, recording/reading system and recording method

A recording/reading system comprising:

• a first nozzle row, a second nozzle row, a third nozzle row and a fourth nozzle row in which a plurality of nozzles configured to eject liquid to a medium are arranged with respect to each other in a predetermined direction;
• and
• a control unit configured to control ejection of the liquid by the first nozzle row, the second nozzle row, the third nozzle row and the fourth nozzle row to record a first pattern on the medium by controlling the first nozzle row and the second nozzle row and to record a second pattern on the medium by controlling the third nozzle row and the fourth nozzle row, the first pattern including a first overlapping region and a first normal region, the second pattern including a second overlapping region and a second normal region;
• a reading unit configured to read the first pattern and the second pattern recorded on the medium;
• and
• a detection unit configured to detect foreign matter at the reading unit by comparing positions of density changes in the first pattern and the second pattern, based on a reading result of the first pattern and the second pattern from the reading unit, wherein
• the control unit is configured to form the first overlapping region at a position overlapping the second normal region as viewed in a longitudinal direction, the first normal region being a region where a raster line having the longitudinal direction corresponding to a direction intersecting the predetermined direction is formed using the first nozzle row or the second nozzle row, the first overlapping region being a region where the raster line is formed using the first nozzle row and the second nozzle row, the second normal region being a region where the raster line is formed using the third nozzle row or the fourth nozzle row, the second overlapping region being a region where the raster line is formed using the third nozzle row and the fourth nozzle row.

A recording/reading method of a recording/reading system, the recording/reading method comprising:

• controlling ejection of liquid by a first nozzle row and a second nozzle row including a plurality of nozzles configured to eject the liquid to a medium to record a first pattern and a second pattern on the medium, respectively, by causing the first nozzle row and the second nozzle row to perform scan of ejecting the liquid while moving forward or backward along a predetermined main scanning direction, the first pattern including a first overlapping region and a first normal region, the second pattern including a second overlapping region and a second normal region;
• reading the first pattern and the second pattern recorded on the medium;
• and
• detecting foreign matter by comparing positions of density changes in the first pattern and the second pattern, based on a reading result of the first pattern and the second pattern, wherein
• the first overlapping region is formed at a position overlapping the second normal region as viewed in a longitudinal direction, the first overlapping region and the second overlapping region each being a region where a raster line having the longitudinal direction corresponding to the main scanning direction is formed by performing the scan m times, the first normal region and the second normal region being a region where the raster line is formed by performing the scan n times, n being smaller than m.

A recording/reading method of a recording/reading system, the recording/reading method comprising:

• controlling ejection of liquid by a first nozzle row and a second nozzle row, a third nozzle row and a fourth nozzle row in which a plurality of nozzles configured to eject the liquid to a medium are arranged with respect to each other in a predetermined direction to record a first pattern on the medium by controlling the first nozzle row and the second nozzle row and to record a second pattern on the medium by controlling the third nozzle row and the fourth nozzle row, the first pattern including a first overlapping region and a first normal region, the second pattern including a second overlapping region and a second normal region;
• reading the first pattern and the second pattern recorded on the medium;
• and
• detecting foreign matter by comparing positions of density changes in the first pattern and the second pattern, based on a reading result of the first pattern and the second pattern, wherein
• the first overlapping region is formed at a position overlapping the second normal region as viewed in a longitudinal direction, the first normal region being a region where a raster line having the longitudinal direction corresponding to a direction intersecting the predetermined direction is formed using the first nozzle row or the second nozzle row, the first overlapping region being a region where the raster line is formed using the first nozzle row and the second nozzle row, the second normal region being a region where the raster line is formed using the third nozzle row or the fourth nozzle row, the second overlapping region being a region where the raster line is formed using the third nozzle row and the fourth nozzle row.