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    METHOD FOR IMPROVING THE CONSISTENCY OF THE COLOR DENSITY OVER A PRINTING WIDTH AND INKJET PRINTER
    2.
    发明公开
    METHOD FOR IMPROVING THE CONSISTENCY OF THE COLOR DENSITY OVER A PRINTING WIDTH AND INKJET PRINTER 审中-公开

    公开(公告)号：EP4349603A1

    公开(公告)日：2024-04-10

    申请号：EP22199414.8

    申请日：2022-10-03

    申请人： BOBST MEX SA

    发明人： BERCLAZ, Paul ,  RICHARD, Matthieu ,  HOFMANN, Thomas

    IPC分类号： B41J2/155 ,  B41J2/205 ,  B41J2/21

    摘要： The invention relates to a method for improving the consistency of the color density over the printing width of an inkjet printer (10) comprising the steps of:
    - Printing a 2-dimensional pattern (32), wherein the 2-dimensional pattern (32) has the same nominal print density over a printing width and varying nominal print densities in printing direction;
    - Dividing the 2-dimensional pattern (32) in multiple columns (38) across the printing width;
    - Recording with a camera (24) at least one color value for each nominal print density in each of the columns (38);
    - Deriving a correction curve for each column (38) from the recorded color values; and
    - Correcting printing signals and/or printing patterns with the correction curves.
    Furthermore, the invention relates to an inkjet printer (10).

    LIQUID DISCHARGE APPARATUS, LIQUID DISCHARGE METHOD, AND CARRIER MEDIUM
    3.
    发明公开
    LIQUID DISCHARGE APPARATUS, LIQUID DISCHARGE METHOD, AND CARRIER MEDIUM 审中-公开

    公开(公告)号：EP4265423A1

    公开(公告)日：2023-10-25

    申请号：EP23168185.9

    申请日：2023-04-17

    申请人： Ricoh Company, Ltd.

    发明人： HAMADA, Kyohei

    IPC分类号： B41J2/205 ,  B41J2/21 ,  B41J19/14 ,  G06K15/10

    摘要： A liquid discharge apparatus (10) includes a recording head (300) and circuitry (3) including a selective-discharge mask having two or more bits. The circuitry (3) moves the recording head (300) relative to a recording medium (101) while causing the recording head (300) to discharge a liquid onto the recording medium (101), moves the recording head (300) and the recording medium (101) relative to each other while causing the recording head (300) not to discharge the liquid, alternately repeats a main scanning movement operation and a sub-scanning movement operation, converts input data to dot data including two or more types of dots, changes the selective-discharge mask in accordance with the types of the dots, converts the dot data to scan data for each of the main scanning movement operation using the dot data and the selective-discharge mask, and transfers the scan data to the recording head (300) to cause the recording head (300) to discharge the liquid according to the scan data.