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Method for density compensation by drop size adaptation

一种尺寸、油墨密度的技术，应用在印刷、打印装置、仪器等方向，能够解决印刷图像重新加网等问题

Active Publication Date: 2017-08-04
HEIDELBERGER DRUCKMASCHINEN AG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This printer also has the great disadvantage that the printed image has to be rescreened every time density fluctuations are corrected

Method used

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  • Method for density compensation by drop size adaptation

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Embodiment Construction

[0017] The drawing shows an inkjet printing machine 1 which operates with page-wide printing swaths. The printing bar here has three printing heads 6 which contain printing nozzles. In the drawing, the printing heads 6 each have ten printing nozzles, where each printing head 6 applies printing ink to the printing material. In this case, each print head 6 is controlled by two print head control electronic cards in the form of inkjet converter cards 5a, 5b. The task of the inkjet converter cards 5 a , 5 b is to convert the temporal activation signals of the individual nozzles into control signals for controlling the printing head 6 . For reasons of computing power, two inkjet converter cards 5 a , 5 b are provided for each printing head 6 in the figure.

[0018]Furthermore, the printing system 1 has digital graphics cards 4 a , 4 b , 4 c , wherein one digital graphics card is responsible for each ink channel. The digital graphics cards 4 a , 4 b , 4 c generate the temporal ac...

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Abstract

A method for modifying color density values in a dot-based printing system uses a control unit. The control unit implements the modification of the color density values after a raster image has been created and modifies the number and / or size of print dots to be applied to a printing substrate in order to attain pre-defined color density target values.

Description

technical field [0001] The invention relates to a method for varying the ink density value in a dot-based printing system by means of a control computer. Background technique [0002] Especially in printing presses and printers using inkjet technology, fluctuations in the ink density always occur during printing, which lead to brightness differences on the printing material transverse to the printing direction. Such density fluctuations are produced by the fact that in a print head, the nozzles discharge drop volumes of different sizes, usually for manufacturing reasons. The problem of density fluctuations is corrected in the prior art by image correction prior to the screening of the different color separations. For example, in European patent application EP 1308 279 A2 it is proposed to manipulate (manipulieren) the ink values ​​in the image in incorrectly functioning printing nozzles, so that the observer can get the impression that the printed image is still in color de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41J29/393
CPCB41J29/393B41J2/2054B41J2/2146B41J2/04508B41J2/04581H04N1/52H04N1/58B41J2/04593B41J2/04558B41J2/04595B41J2029/3935G06K15/1836G06K2215/0094G06K2215/101H04N1/4055
Inventor I·特拉莎娜斯G·容汉斯
Owner HEIDELBERGER DRUCKMASCHINEN AG
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