JPS5812764A - Ink jet recording system - Google Patents

Abstract

PURPOSE:To enhance the quality of printing by a method in which the amounts of inks of primary color and mixed color to be adhered on a recording paper are equalized in such a way that the amount of ink of primary color is reduced for the colors to be formed by mixing inks of primary colors. CONSTITUTION:Two systems of nozzle rows represented by YI, VII, CI, CII, MI, and MII for the colors of yellow, cyanine, and Magenda are provided. These nozzle rows of different diameters are selectively driven by a control circuit T. At the time of primary color printing, a printing head is driven a drive circuit D1 and the nozzle rows YI, CI, and MI are used, and also at the time of mixed color printing, the printing head is driven by a drive circuit D2 and the nozzle rows YII, CII, and MII are used. Thus, even when recording is made both by inks of primary color and mixed color, printing can be performed by the same amounts of inks.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording method of an inkjet recording device,
In particular, the present invention relates to an inkjet recording method capable of recording in multiple colors.

The recording head (hereinafter simply referred to as head) of a conventional color inkjet recording device has a full array of nozzles dedicated to different color inks such as cyan, magenta yellow, black, etc., and color recording is performed by selectively driving the nozzles. I was doing it.

In the above head, all the nozzles included in the nozzle row had the same diameter. Therefore, when recording in multiple colors (for example, 7 colors) on recording paper by mixing primary color inks (cyan, magenta, yellow), the colors that appear more clearly due to the mixing are (red = magenta + yellow,
(green = bright + yellow, blue-purple = bright + magenta) Since the ink from each nozzle is mixed, the amount of ink on the recording paper increases, and the dots also become larger than the dots of primary color ink. Is this the print quality? This is a drawback that makes it look unnatural.

FIG. 3(a) shows an example of such printed dots, in which 1G shows a primary color printed dot and a KH mixed color printed dot.

The present invention has been made in view of this point, and the nozzle arrays for each color are provided with all the nozzle arrays having different nozzle diameters, and the colors created by selectively driving these nozzle arrays and mixing all the primary color inks. The amount of primary color ink to be ejected is reduced, and the free ink Q' (+-
It is an object of the present invention to provide an inkjet recording method in which both the primary colors and the mixed colors are the same and the printing quality is high.

The present invention applies the following properties of a drop-on-demand type head.

In other words, the diameter (volume) of the ink ejected from the nozzle depends on the nozzle diameter. When the number of particles is the same, there is a relationship between the nozzle diameter dn and the ink particle diameter d d &I as shown in FIG.

From this relationship, the diameter of the ink droplet (1a (body f1
In order not to reduce v), the nozzle diameter dn should be made smaller.

Preferred embodiments of the present invention will be explained below with reference to the drawings.

FIG. 2 shows an embodiment 11q of the present invention. Second
In the figure, H denotes a recording head, r+'t 2 and 1 each color (cyan, magenta, yellow) Ic vs i, and nozzle rows I and 2 each having a nozzle follower sound of size 2flffi are provided. It has two nozzle arrays designated yI, yH, cl, c, , Ml, and Ml for each color of yellow, cyan, and magenta. At this time, the nozzle row Y with a large diameter
1. C(, total diameter d of ink particles ejected from Ml, small diameter nozzle row Y11.CII, diameter k d t of ink particles ejected from Ml, the volume of the ink particles is vl = -π(-6-) 3 2 v2-4π (on j) S 2 .

Nozzle Y1 for recording primary color ink. C[, Ml is used, and when the print head is driven by a drive circuit to mix and create colors, the nozzle row Yl of the color to be mixed is used.

The drive circuit used for C1 and M[' drives the print head. T is a control circuit. For that purpose, Vl = 2V
! is necessary, and in this case, the relationship between d+ and dt is d+=
” (2d = 1.26 dl, and the ink particle diameter ratio FX should be 1.26.

There is a switch to change it to S.

3- If the printing sound is made under these conditions, recording can be performed with the same amount of ink whether recording in primary colors or recording colors created by mixing all color inks.

Figures 3 and 3) show printed dots according to the invention. In the figure, G' indicates an example of printed dots of primary colors, and K' indicates an example of printed dots of mixed colors.

According to the present invention, it is possible to record with the same amount of ink for all seven colors, and the print quality can be made sufficiently high.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the relationship between nozzle diameter and ink particle diameter, Fig. 2 is a configuration diagram of an embodiment of the present invention, Fig. 3 (a) is a diagram showing a conventional printing dot, Fig. 3 (0) ) is a diagram showing printed dots' by the recording head VC according to the present invention. H: Recording bed, C1 and C11 nozzle rows, Y
l, Yl: yellow nozzle row, Ml, Ml: magenta nozzle row, I)+, Dt: drive 1ril path, T: control circuit. 4- Figure 3 q 319- to' (b)

Claims (1)

[Claims] (1) In a multi-nozzle inkjet recording head that enables multi-color printing by separating common ink chambers corresponding to nozzle rows that eject ink and injecting different color inks into each common ink chamber, one ink jet recording head is used for each color. An inkjet recording system comprising at least two or more nozzle rows with different nozzle diameters, the nozzle rows being selectively driven by a control circuit.