Thermal printing apparatus

Details Thermal printing apparatus Thermal printing apparatus

1990-07-13

1994-06-07

Fuller, Benjamin R.

Recorders

Thermal recording

358298, B41J 232, B41J 2355

Patent

active

053193911

ABSTRACT:
A thermal printing apparatus for printing input gradational images, characters and figures by using multilevel density which can appropriately regulate the levels of the densities representing the gradational images etc. to be printed by a linear thermal head having n heating resistors arranged in a line, the printing apparatus is provided with a density control unit for regulating, for example, the multilevel durations for energizing the heating resistors in accordance with n gradational printing data each corresponding to respective one of said resistors, and a data conversion unit, receiving a set of n original data for each line as the printing data, for producing p sets of n data for p split lines on the basis of the n original data, where p is an integer being equal to or greater than two, the p sets of n data being sequentially supplied to the density control unit set by set to print each line corresponding to the input gradational image, character and figure printing data as a plurality of split lines corresponding thereto, thereby increasing uniformity of density of print lines of pixels of the input gradational images, characters and figures by overlapping low density portions of dotes of adjacent split lines.

REFERENCES:
patent: 4560992 (1985-12-01), Hayashi et al.
patent: 4652892 (1987-03-01), Tanaka

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