Incremental printing of symbolic information – Thermal marking apparatus or processes – Gradational recording
Patent
1994-12-27
1998-02-24
Reinhart, Mark J.
Incremental printing of symbolic information
Thermal marking apparatus or processes
Gradational recording
B41J 2355, G01D 1510, G01D 1516
Patent
active
057215782
ABSTRACT:
A gradation control method in a color thermal transfer printer is adapted to express one pixel by a dot matrix with two rows and two coles, control a density value of one dot with a time for energizing a heating element of a thermal head, and carry out mask patterning for plotting only one of four dots when the gradation of each color for one pixel is not more than a prescribed value while plotting only two of the four dots when the gradation is in excess of the prescribed value. At this time, employed is a mask pattern of necessarily plotting cyan and magenta on dots which are different from each other. A picture quality improving method in a staggered printing system is adapted to plot a noted dot when at least one of such conditions that density data of the noted dot is in excess of a prescribed density value and that density data of any of four dots most approximate to the noted dot is not more than a prescribed low density value is satisfied, even if the noted dot corresponds to that to be masked.
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Patent Abstracts of Japan, vol. 10, No. 21, Sep. 14, 1985.
Adachi Yasushi
Nakai Yoshiyuki
Takehara Toshio
Takeno Tsuyoshi
Tanaka Tatsuya
Anderson L.
Reinhart Mark J.
Sharp Kabushiki Kaisha
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