B - Operations – Transporting – 41 – B
Patent
B - Operations, Transporting
41
B
178/3.2
B41B 19/00 (2006.01) H04N 1/405 (2006.01) H04N 1/52 (2006.01)
Patent
CA 1127090
ABSTRACT The invention relates to a process for producing screen or half-tone printing blocks of optional screen angle and screen line spacing by line by line recording of screen dots which comprise areal elements. An UV co-ordinate system oriented in the line direction and an XY co-ordinate system turned through the screen angle which is to be recorded are co-ordinated with the recording means. Screen theshold values are allocated to a number of areal elements of a screen sec- tion which areally corresponds to at least one screen grid element as comparison values for the picture signal values obtained upon scanning an original. During generation of the screen dots, the UV positional co-ordinates of the areal ele- ments scanned by the recording unit are measured, are conver- ted under consideration of the screen angle into the XY posi- tional co-ordinates of the positionally co-ordinated areal elements of the screen section, and the corresponding screen threshold values are called. The screen threshold values called are compared to the picture signal values and a control signal is derived from the comparison for the recording unit, which determines whether the momentarily traversed areal elements are to be recorded or not on the recording medium or carrier as part of a screen dot. The advantage of the inven- tion essentially consists in that any optional screen angle is produced with very high precision and constancy, so that troublesome moire patterns are averted.
330359
Gall Winrich
Wellendorf Klaus
Fetherstonhaugh & Co.
Heidelberger Druckmaschinen Aktiengesellschaft
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