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US 2010/0149258 A1Published application
Ink jet print head and printing method and apparatus using the same
AssigneeCanon Kabushiki Kaisha
InventorMichinari Mizutani
Life of this patent
Estimating the term…
Abstract
The present invention relates to measures for preventing end deviation that may occur during high-duty printing such as one-pass printing, and in particular, to measures for preventing density unevenness (white stripes) in the case of ink with a low lightness such as black ink. According to the present invention, the amount of black ink ejected through the corresponding ejection ports is set to be larger than that of color ink ejected through the corresponding ejection ports. Two black ink ejection chips each having at least one black ink ejection port row are arranged on the respective sides of a color ink ejection chip.
Claims18
An ink jet print head comprising:
- a first black ink ejection chip and a second black ink ejection chip each including a black ink ejection port row having a plurality of ejection ports through which black ink is ejected;
- and
- a color ink ejection chip including a plurality of color ink ejection port rows each having a plurality of ejection ports through which color ink is ejected,
- wherein each of the plurality of ejection ports through which the black ink is ejected has a larger ejection amount than each of the plurality of ejection ports through which the color ink is ejected, and
- at least one black ink ejection port row is provided in each of the first and second black ink ejection chips, and the first and second black ink ejection chips are arranged on respective sides of the color ink ejection chip.
2 more elements
An ink jet printing method using an ink jet print head, the ink jet print head comprising:
- a first black ink ejection chip and a second black ink ejection chip each including at least one black ink ejection port row having a plurality of ejection ports through which black ink is ejected;
- and
- a color ink ejection chip including a plurality of color ink ejection port rows each having a plurality of ejection ports through which color ink is ejected,
- wherein each of the plurality of ejection ports through which the black ink is ejected having a larger ejection amount than each of the plurality of ejection ports through which the color ink is ejected,
- the first and second black ink ejection chips being arranged on respective sides of the color ink ejection chip, and
- the method characterizing in that one black ink ejection port row is selected from each of the first and second black ink ejection chips and driven.
3 more elements
An ink jet printing method using an ink jet print head, the ink jet print head comprising:
- a first black ink ejection chip and a second black ink ejection chip each including a plurality of black ink ejection port rows having a plurality of ejection ports through which black ink is ejected;
- and
- a color ink ejection chip including a plurality of color ink ejection port rows each having a plurality of ejection ports through which color ink is ejected,
- wherein each of the plurality of ejection ports through which the black ink is ejected having a larger ejection amount than each of the plurality of ejection ports through which the color ink is ejected,
- the first and second black ink ejection chips being arranged on respective sides of the color ink ejection chip, and
- the method characterizing in that a first combination of two black ink ejection port rows selected from the first and second black ink ejection chips, respectively, and a second combination of two black ink ejection port rows selected from the first and second black ink ejection chips, respectively, which is different from the first combination, are alternately driven according to image data.
3 more elements
An ink jet printing method using an ink jet print head, the ink jet print head comprising:
- a first black ink ejection chip and a second black ink ejection chip each including a plurality of black ink ejection port rows having a plurality of ejection ports through which black ink is ejected;
- and
- a color ink ejection chip including a plurality of color ink ejection port rows each having a plurality of ejection ports through which color ink is ejected,
- wherein each of the plurality of ejection ports through which the black ink is ejected having a larger ejection amount than each of the plurality of ejection ports through which the color ink is ejected,
- the first and second black ink ejection chips being arranged on respective sides of the color ink ejection chip, and
- the method comprising:
- a step of determining a print duty of image data,
- wherein if the print duty is higher than a predetermined value, at least one black ink ejection port row is selected from each of the first and second black ink ejection chips and driven, and
- if the print duty is lower than the predetermined value, at least two black ink ejection port rows are selected from the first or second black ink ejection chip and driven.
6 more elements
An ink jet printing apparatus comprising an ink jet print head, the ink jet print head comprising:
- a first black ink ejection chip and a second black ink ejection chip each including at least one black ink ejection port row having a plurality of ejection ports through which black ink is ejected;
- and
- a color ink ejection chip including a plurality of color ink ejection port rows each having a plurality of ejection ports through which color ink is ejected,
- wherein each of the plurality of ejection ports through which the black ink is ejected having a larger ejection amount than each of the plurality of ejection ports through which the color ink is ejected,
- the first and second black ink ejection chips being arranged on respective sides of the color ink ejection chip, and
- the apparatus further comprising:
- means for selecting one black ink ejection port row from each of the first and second black ink ejection chips.
4 more elements
An ink jet printing apparatus comprising an ink jet print head, the ink jet print head comprising:
- a first black ink ejection chip and a second black ink ejection chip each including a plurality of black ink ejection port rows having a plurality of ejection ports through which black ink is ejected;
- and
- a color ink ejection chip including a plurality of color ink ejection port rows each having a plurality of ejection ports through which color ink is ejected,
- wherein each of the plurality of ejection ports through which the black ink is ejected having a larger ejection amount than each of the plurality of ejection ports through which the color ink is ejected,
- the first and second black ink ejection chips being arranged on respective sides of the color ink ejection chip,
- the apparatus further comprising:
- means for alternately selecting, according to image data, a first combination of two black ink ejection port rows selected from the first and second black ink ejection chips, respectively, and a second combination of two black ink ejection port rows selected from the first and second black ink ejection chips, respectively, which is different from the first combination.
4 more elements
An ink jet printing apparatus comprising an ink jet print head, the ink jet print head comprising:
- a first black ink ejection chip and a second black ink ejection chip each including a plurality of black ink ejection port rows having a plurality of ejection ports through which black ink is ejected;
- and
- a color ink ejection chip including a plurality of color ink ejection port rows each having a plurality of ejection ports through which color ink is ejected,
- wherein each of the plurality of ejection ports through which the black ink is ejected having a larger ejection amount than each of the plurality of ejection ports through which the color ink is ejected,
- the first and second black ink ejection chips being arranged on respective sides of the color ink ejection chip,
- the apparatus further comprising:
- means for determining a print duty of image data;
- and
- means for selecting at least one black ink ejection port row from each of the first and second black ink ejection chips if the print duty is higher than a predetermined value, and
- selecting at least two black ink ejection port rows from the first or second black ink ejection chip if the print duty is lower than the predetermined value.
7 more elements
An ink jet printing method comprising an ink jet print head, the ink jet print head comprising:
- a first black ink ejection chip and a second black ink ejection chip each including a plurality of black ink ejection port rows having a plurality of ejection ports through which black ink is ejected;
- and
- a color ink ejection chip including a plurality of color ink ejection port rows each having a plurality of ejection ports through which color ink is ejected,
- wherein each of the plurality of ejection ports through which the black ink is ejected having a larger ejection amount than each of the plurality of ejection ports through which the color ink is ejected,
- the first and second black ink ejection chips being arranged on respective sides of the color ink ejection chip,
- the method characterizing in that comprises means for alternately selecting, according to image data, a combination of at least two black ink ejection port rows from the first black ink ejection chip and a combination of at least two black ink ejection port rows from the second black ink ejection chip if the print duty is lower than the predetermined value.
3 more elements
Dependencies are inferred from the claim text.