Fluid ejecting apparatus and method of ejecting fluid

#This application claims priority to Japanese Patent Application No. 2008-223885 filed on Sep. 1, 2008. The entire disclosure of Japanese Patent Application No. 2008-223885 is hereby incorporated herein by reference.

#1. Technical Field

#The present invention relates to a fluid ejecting apparatus and a method of ejecting a fluid.

#The invention will be described with reference to the accompanying drawings, wherein like numbers reference like elements.

#FIG. 1 is a block diagram illustrating an overall configuration of a printing system according to the present embodiment.

#FIG. 2A is a cross-sectional view of a printer 1, and FIG. 2B is a view illustrating a state in which a printer 1 transports paper S.

#Aspects described below are apparent from disclosure of the specification and disclosure of the accompanying drawings of the invention.

#According to an aspect of the invention, a fluid ejecting apparatus includes: a head unit which includes a first head in which a plurality of first nozzle rows in each of which a nozzle for ejecting a fluid of a first color onto a medium and a nozzle for ejecting a fluid of a second color onto a medium are lined up in a color order in which the first color is earlier than the second color in a predetermined direction and the nozzles are lined up in a cross direction crossing the predetermined direction and a second head which is disposed at a downstream side of the first head in the predetermined direction and in which a plurality of second nozzle rows in each, where the two nozzles are lined up in a color order identical to the color order in the predetermined direction, are lined up in the cross direction, wherein the first nozzle row, which is positioned on an end part of one end side of the first head in the cross direction, overlaps the second nozzle row, which is positioned on an end part of the other end side of the second head in the cross direction, in the cross direction, so that a composite nozzle row in which the first nozzle row and the second nozzle row are lined up in the predetermined direction is formed; a movement mechanism which moves the medium relative to the head unit in the predetermined direction; and a controller which controls a nozzle to eject a fluid onto the medium, which is moved by the movement mechanism, from nozzles of the first nozzle row and the second nozzle row which belong to the composite nozzle row for each color and disposes a plurality of color-overlapped dots in the predetermined direction to form a raster line, wherein the controller controls a nozzle to eject a fluid such that a first ratio of A1 to “A1+A2” is larger than a second ratio of B1 to “B1+B2” to form the raster line, where A1 denotes an amount of a fluid of the first color on the raster line ejected from the first nozzle row, A2 denotes an amount of a fluid of the first color on the raster line ejected from the second nozzle row, B1 denotes an amount of a fluid of the second color on the raster line ejected from the first nozzle row, and B2 denotes an amount of a fluid of the second color on the raster line ejected from the second nozzle row.

#According to the fluid ejecting apparatus, an image characteristic difference between an image part formed by a fluid ejected from the non-composite nozzle row and an image part formed by a fluid ejected from the composite nozzle row is inhibited, whereby the image quality is improved.