Patent ID: 9085183
Filing Date: 2015-07-21
Classification: B41J

Abstract:
1. A liquid ejection apparatus comprising: a conveyor configured to convey a recording medium in a first direction; a liquid ejection head in which ejection opening arrays, in each of which ejection openings for ejecting liquid are lined up in a second direction intersecting with the first direction, are lined up in a third direction orthogonal to the second direction; and a controller configured to control the conveyor and the liquid ejection head to record, onto the recording medium, a pattern group including unit patterns for detecting a tilt angle in the second direction with respect to the first direction, each of the unit patterns including: a first region which is recorded on the recording medium by liquid ejected from the ejection openings of both a first ejection opening array and a second ejection opening array of the ejection opening arrays; and at least one second region which is recorded on the recording medium by liquid ejected from the ejection openings of one of the first ejection opening array and the second ejection opening array, the first region being a region recorded based on dot allocation with which an optical characteristic varies in accordance with intervals of dots formed by the impacted liquid in a fourth direction which is orthogonal to the first direction, the at least one second region being a region recorded based on dot allocation with which the optical characteristic varies in accordance with intervals of the dots formed by the impacted liquid in the first direction, and between the unit patterns of the pattern group, the first regions being identical with one another in the dot allocation, and the second regions being different from one another in the dot allocation.