Printing of angled and curved lines using thermal dot matrix pri

Details Printing of angled and curved lines using thermal dot matrix pri Printing of angled and curved lines using thermal dot matrix pri

1987-07-17

1988-11-08

Goldberg, E. A.

Recorders

Thermal recording

346 11, 219216, G01D 1510

Patent

active

047836679

ABSTRACT:
A method and apparatus are described for enhancing the visual quality of dot matrix characters printed by means of thermal printing technologies, particularly in enhancing diagonal lines and blended radii of curvature. Two independent techniques can be combined or used in isolation to effect this print enhancement. The first, quarter dot step resolution, enables printed dots to be positioned at one quarter their previous step displacement distance. Memory must be expanded to handle increased dot position resolution. The second technique is element energy control, which enables each element in the printhead to emit different energy levels. The individual dot energy control translates into control of the printed dot shape and size, which when properly controlled, allows printing of diagonal lines and blended radii of curvature. This second technique further increases the required memory space by an additional factor.

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