PRINTING APPARATUS AND PRINTING METHOD
First Claim
1. A printing apparatus for performing printing in an inkjet method, comprising:
- an inkjet head for ejecting ink drops toward a medium;
a main scan driver for driving the inkjet head to perform main scan operations in a main scan direction;
a sub scan driver for relatively moving the inkjet head and the medium in a sub scan direction perpendicular to the main scan direction; and
a controller for controlling ejection of ink drops from the inkjet head, and driving of the main scan driver and the sub scan driver,wherein the controller repeats a predetermined number of printing passes of ejecting ink drops from the inkjet head while moving the inkjet head in the main scan direction, whereby printing is performed on the medium, andthe controller controls ink drop ejection on a basis of mask data items for designating pixels to be subjected to ink drop ejection, such that spatial frequencies of an arrangement of ink dots which are formed on the medium during a first printing pass are lower than spatial frequencies of an arrangement of ink dots which are formed on the medium during a second printing pass later than the first printing pass.
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Accused Products
Abstract
A printing apparatus for performing printing in an inkjet mode includes an inkjet head, and a controller. The controller controls the inkjet head such that the inkjet head performs printing on a medium in a multi-pass mode. In each printing pass performed on each position of the medium, the controller controls the inkjet head such that the inkjet head ejects ink drops onto pixels designated by a mask data item. In a case where the spatial frequencies of the arrangement of ink dots formed on the medium during a first printing pass of the printing passes are referred to as first frequencies, and the spatial frequencies of the arrangement of ink dots formed on the medium during a second printing pass later than the first printing pass are referred to as second frequencies, the first frequencies are frequencies lower than the second frequencies.
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Citations
10 Claims
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1. A printing apparatus for performing printing in an inkjet method, comprising:
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an inkjet head for ejecting ink drops toward a medium; a main scan driver for driving the inkjet head to perform main scan operations in a main scan direction; a sub scan driver for relatively moving the inkjet head and the medium in a sub scan direction perpendicular to the main scan direction; and a controller for controlling ejection of ink drops from the inkjet head, and driving of the main scan driver and the sub scan driver, wherein the controller repeats a predetermined number of printing passes of ejecting ink drops from the inkjet head while moving the inkjet head in the main scan direction, whereby printing is performed on the medium, and the controller controls ink drop ejection on a basis of mask data items for designating pixels to be subjected to ink drop ejection, such that spatial frequencies of an arrangement of ink dots which are formed on the medium during a first printing pass are lower than spatial frequencies of an arrangement of ink dots which are formed on the medium during a second printing pass later than the first printing pass. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10)
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9. A printing method of performing printing in an inkjet method using a printing apparatus including
an inkjet head for ejecting ink drops toward a medium, a main scan driver for driving the inkjet head to perform main scan operations in a main scan direction, a sub scan driver for relatively moving the inkjet head and the medium in a sub scan direction perpendicular to the main scan direction, and a controller for controlling ejection of ink drops from the inkjet head, and driving of the main scan driver and the sub scan driver, the method comprising: -
a step of allowing the controller to repeat a predetermined number of printing passes of ejecting ink drops from the inkjet head while moving the inkjet head in the main scan direction, thereby performing printing on each position of the medium, wherein the controller controls ink drop ejection on a basis of mask data items for designating pixels to be subjected to ink drop ejection, such that spatial frequencies of an arrangement of ink dots which are farmed on the medium during a first printing pass are lower than spatial frequencies of an arrangement of ink dots which are formed on the medium during a second pass later than the first printing pass.
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Specification