Direct electrostatic printing method and apparatus

Details Direct electrostatic printing method and apparatus Direct electrostatic printing method and apparatus

1998-03-19

2000-06-27

Moses, Richard

Incremental printing of symbolic information

Ink jet

Ejector mechanism

B41J 206

Patent

active

060812834

ABSTRACT:
A direct electrostatic printing device and method for printing an image to an information carrier with increased density harmonization. This is attained by measuring the behavior of the apertures and subsequently adjusting the control parameters of at least the diverging apertures. The measurement of the behaviour of the apertures is suitably performed by scanning a known print sample with a predetermined density. The scanned values are inverted around a predetermined value for which no compensation is done to create a compensation function. At least the apertures which have a behavior which diverges from a predetermined behaviour are compensated according to the compensation function, thereby enabling an increased density harmonization. The compensation function can preferably be signal processed by, for example, a low pass filtering.

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