DYSFUNCTIONAL EJECTION UNIT DETERMINATION IN INKJET PRINTING
The present invention relates to a method for establishing a list of dysfunctional ejection units, i.e. a list of ejection units in an inkjet printer that are to be discarded during printing of image data in order to obtain a better print quality. The method comprises the steps of: printing and scan...
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Main Author | |
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Format | Patent |
Language | English French German |
Published |
28.02.2024
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Subjects | |
Online Access | Get full text |
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Summary: | The present invention relates to a method for establishing a list of dysfunctional ejection units, i.e. a list of ejection units in an inkjet printer that are to be discarded during printing of image data in order to obtain a better print quality. The method comprises the steps of: printing and scanning a first test pattern (9) wherein individual dots of a single ejection unit can be discerned; printing and scanning a second test pattern (8) with uniform grayscale areas that are processed in a similar way as image data; determining a drop ejection characteristic of a single ejection unit from the scanned first test pattern; determining an optical profile of the second test pattern in a direction of the array; composing a list of ejection units that yield dots outside a predetermined range; adding to the list the ejection units that show a deviating optical density compared to their direct environment, and passing the list of ejection units to the printer control software as a list of dysfunctional ejection units. |
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Bibliography: | Application Number: EP20220192142 |