Recording medium conveyance amount measurement method and inkjet recording apparatus

An inkjet recording apparatus, comprising:

• a conveyance device which conveys a recording medium;
• an ejection device which ejects liquid toward the recording medium while moving in a direction perpendicular to a conveyance direction of the recording medium;
• a test pattern generation device which generates a first test pattern and a second test pattern, each having two straight lines including at least one straight line which is not parallel with respect to the conveyance direction of the recording medium and is not parallel with a direction perpendicular to the conveyance direction;
• a reading device which reads in the first test pattern and the second test pattern formed on the recording medium;
• and
• a feed deviation amount calculation device which calculates a feed deviation amount of the recording medium in the conveyance direction according to results of reading in the first test pattern and the second test pattern by the reading device,
• wherein the recording medium is conveyed in the conveyance direction after the first test pattern is formed on the recording medium, the second test pattern is then formed on the recording medium, and the feed deviation amount of the recording medium in the conveyance direction is calculated according to the results of reading in the first test pattern and the second test pattern, wherein the first and second test patterns are mutually reversed in the conveyance direction.

An inkjet recording apparatus, comprising:

• a conveyance device which conveys a recording medium;
• an ejection device which ejects liquid toward the recording medium while moving in a direction perpendicular to a conveyance direction of the recording medium;
• and
• a test pattern generation device which generates a first test pattern and a second test pattern, each having two straight lines including at least one straight line which is not parallel with respect to the conveyance direction of the recording medium and is not parallel with a direction perpendicular to the conveyance direction,
• wherein the recording medium is conveyed in the conveyance direction after the first test pattern is formed on the recording medium, the second test pattern is then formed on the recording medium, and the first and second test patterns are mutually reversed in the conveyance direction.