Ink jet printing apparatus and printing method
First Claim
1. An ink jet printing apparatus for printing an image by performing a print scan which makes a print while causing a printing head, which includes an array of printing elements for ejecting ink, to scan on a printing medium in a direction different from a direction of the array, and by conveying the printing medium in a direction intersecting with the direction of the print scan, the apparatus comprising:
- controller which reduces a range in the array of the printing elements to be used for printing on at least one of front and rear end portions of the printing medium so that the range can be smaller than a range in the array of the printing elements to be used for printing on a central portion of the printing medium, and thus, which performs the print scan,wherein the controller changes the size of the reducing range depending on at least one of a print mode selected from a plurality of print modes, each having the different number of colors of ink usable for printing the image, and a type of selected printing medium.
1 Assignment
0 Petitions
Accused Products
Abstract
High image quality is maintained even on front and rear ends of a printing medium where deterioration in the image quality is more likely to occur due to reduction in conveyance accuracy of the printing medium. In printing on the front and rear ends, the printing medium being not supported by both conveying means respectively placed upstream and downstream of a printing point in a printing medium conveying direction, a print swath of a printing head and the amount of conveying a printing medium are reduced. Moreover, the reducing print swath and the reducing conveyance amount are designed to be decreased in the cases of selecting a printing medium for high-quality printing as well as a monochrome print mode where image distortion caused by deviation of ink-landing positions is more noticeable due to a small number of colors of ink to be used and low coverage thereof.
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Citations
14 Claims
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1. An ink jet printing apparatus for printing an image by performing a print scan which makes a print while causing a printing head, which includes an array of printing elements for ejecting ink, to scan on a printing medium in a direction different from a direction of the array, and by conveying the printing medium in a direction intersecting with the direction of the print scan, the apparatus comprising:
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controller which reduces a range in the array of the printing elements to be used for printing on at least one of front and rear end portions of the printing medium so that the range can be smaller than a range in the array of the printing elements to be used for printing on a central portion of the printing medium, and thus, which performs the print scan, wherein the controller changes the size of the reducing range depending on at least one of a print mode selected from a plurality of print modes, each having the different number of colors of ink usable for printing the image, and a type of selected printing medium.
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2. An ink jet printing apparatus for printing an image by performing a print scan which makes a print while causing a printing head, which includes an array of printing elements for ejecting ink, to scan on a printing medium in a direction different from a direction of the array, and by conveying the printing medium in a direction intersecting with the direction of the print scan, the apparatus comprising:
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controller which reduces a range in the array of the printing elements to be used for printing on at least one of front and rear end portions of the printing medium so that the range can be smaller than a range in the array of the printing elements to be used for printing on a central portion of the printing medium, and thus, which performs the print scan, wherein the controller changes the size of the reducing range depending on a print mode selected from a plurality of print modes, each having the different number of colors of ink usable for printing the image. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
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11. An ink jet printing apparatus for printing an image by performing a print scan which makes a print while causing a printing head, which includes an array of printing elements for ejecting ink, to scan on a printing medium in a direction different from a direction of the array, and by conveying the printing medium in a direction intersecting with the direction of the print scan, the apparatus comprising:
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controller which reduces a range in the array of the printing elements to be used for printing on at least one of front and rear end portions of the printing medium so that the range can be smaller than a range in the array of the printing elements to be used for printing on a central portion of the printing medium, and thus, which performs the print scan, wherein the controller changes the size of the reducing range depending on a type of selected printing medium.
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12. An ink jet printing apparatus for printing an image by performing a print scan which makes a print while causing a printing head, which includes an array of printing elements for ejecting ink, to scan on a printing medium in a direction different from a direction of the array, and by conveying the printing medium in a direction intersecting with the direction of the print scan, the apparatus comprising:
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conveyance controller which reduces the amount of conveying the printing medium in making the print on at least one of front and rear end portions of the printing medium as compared with the amount of conveying the printing medium in making the print on a central portion of the printing medium, wherein the controller changes the reducing conveyance amount depending on at least one of a print mode selected from a plurality of print modes, each having the different number of colors of ink usable for printing the image, and a type of selected printing medium.
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13. An ink jet printing method of printing an image by performing a print scan which makes a print while causing a printing head, which includes an array of printing elements for ejecting ink, to scan on a printing medium in a direction different from a direction of the array, and by conveying the printing medium in a direction intersecting with the direction of the print scan, the method comprising the step of:
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reducing a range in the array of the printing elements to be used for printing on at least one of front and rear end portions of the printing medium so that the range can be smaller than a range in the array of the printing elements to be used for printing on a central portion of the printing medium, and performing the print scan using the printing elements of the reduced range, wherein in the reducing step, the size of the reducing range is changed depending on at least one of a print mode selected from a plurality of print modes, each having the different number of colors of ink usable for printing the image, and a type of selected printing medium.
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14. An ink jet printing method of printing an image by performing a print scan which makes a print while causing a printing head, which includes an array of printing elements for ejecting ink, to scan on a printing medium in a direction different from a direction of the array, and by conveying the printing medium in a direction intersecting with the direction of the print scan, the method comprising the step of:
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reducing the amount of conveying the printing medium in making the print on at least one of front and rear end portions of the printing medium as compared with the amount of conveying the printing medium in making the print on a central portion of the printing medium, wherein in the reducing step, the reducing conveyance amount is changed depending on at least one of a print mode selected from a plurality of print modes, each having the different number of colors of ink usable for printing an image, and a type of selected printing medium.
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Specification