US 6,474,775 B1Granted

Ink jet recording apparatus and method for recording with plural nozzle arrays

AssigneeCanon Kabushiki Kaisha

InventorAkira Okamoto

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Abstract

In an area to be recorded with a black ink and a color ink superposed, when an area recorded by the same main-scanning and an area recorded by the other main-scanning mixedly exist, band unevenness occurs. It is an object of the present invention to suppress the band unevenness without reducing a recording speed. Therefore, upon certain main-scanning, it is determined whether image data to be recorded with a cyan ink exists in an area C in FIG. 2 or not. When it is determined that the image data exists, recording by a discharging orifice array for black is not performed in the area C in the main-scanning. When it is determined that no image data exists, recording for the area C is performed in the main-scanning by the discharging orifice array for black.

Claims13

Dependent claims

An ink jet recording apparatus for recording an image on a recording medium, wherein a first discharging orifice array arranging a plurality of discharging orifices for discharging a first ink and a second discharging orifice array arranging a plurality of discharging orifices for discharging a second ink are disposed in parallel in a main-scanning direction different from the arranging direction of the orifice arrays, and said first discharging orifice array, said second discharging orifice array, and the recording medium are relatively moved in the arranging direction of said discharging orifices for each main-scanning of said first discharging orifice array and said second discharging orifice array in the main-scanning direction, said apparatus comprising:

control means for controlling in such a manner that
when an area where a main-scanning region of the first discharging orifice array does not overlap with a main-scanning region of the second discharging orifice array is a first area and an overlapping area is a second area,
in the case where both of first image data to be recorded by the first discharging orifice array and second image data to be recorded by the second discharging orifice array exist in the first area, recording for the first area by the first discharging orifice array is not performed in the main-scanning but recording is performed by the first and second discharging orifice arrays in the main-scanning after the relative movement is performed up to a position where both the first and second image data can be recorded in the first area, and
in the case where the first image data to be recorded by the first discharging orifice array exists in the first area and no second image data to be recorded by the second discharging orifice array exists, in the main-scanning, recording is performed in the first area by the first discharging orifice array.

1 more element

A storage medium readable by a computer, which has stored a program code to execute a recording control process of an ink jet recording apparatus for recording an image on a recording medium, wherein a first discharging orifice array arranging a plurality of discharging orifices for discharging a first ink and a second discharging orifice array arranging a plurality of discharging orifices for discharging a second ink are disposed in parallel in a main-scanning direction different from the arranging direction of the orifice arrays, and said first discharging orifice array, said second discharging orifice array, and the recording medium are relatively moved in the arranging direction of said discharging orifices for each main-scanning of the first discharging orifice array and the second discharging orifice array in the main-scanning direction, said program code including:

a first control processing code to control the ink jet recording apparatus in such a manner that when in one main-scanning an area where a main-scanning region of the first discharging orifice array does not overlap with a main-scanning region of the second discharging orifice array is a first area and an overlapping area is a second area, in the case where both of first image data to be recorded by the first discharging orifice array and second image data to be recorded by the second discharging orifice array exist in the first area, recording for the first area by the first discharging orifice array is not performed in the main-scanning but recording is performed by the first and second discharging orifice arrays in the main-scanning after the relative movement is performed up to a position where both the first and second image data can be recorded in the first area;
and
a second control processing code to control the ink jet recording apparatus in such a manner that in the case where the first image data to be recorded by the first discharging orifice array exists in the first area and no second image data to be recorded by the second discharging orifice array exists, recording for the first area is performed in the main-scanning by the first discharging orifice array.

Dependencies are inferred from the claim text.

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Abstract