| 摘要 |
<p>PURPOSE:To obtain a serial thermal printing method not making the joint between lines prominent without lowering image quality by starting the recording of respective pixels from the cell of a central part and applying recording to peripheral cells as a gradation level becomes high and performing recording so as to form ink dot patterns in a shape extending in an oblique direction at medium and high gradation levels. CONSTITUTION:Recording is started from the cell of the central part of the sub-line of the second row and an ink dot area is elongated in a sub-scanning direction at the first period when a gradation level is 2-4 and, as the gradation level becomes high toward 10, the area of a ink dot is alternately increased in left-downward and right-upward oblique directions from the center of a pixel. In the case of a gradation level of 12 or more, the cells of a left upper end and a right lower end are recorded and the area of an ink dot is increased so that the distribution of ink dots is not deflected to a central part while the pattern shape in an oblique direction is held When left-upper and right-lower end ink dots are recorded as adjacent pixels at a gradation level of 12 or more, the right-upper and left-upper end dots of adjacent pixels form the same direction oblique line before a connection level 11.</p> |
