JPS5839469A - Color image forming method - Google Patents

Abstract

PURPOSE:To make it possible to compose a desired color representation by means of a simple mechanism whereby an image is composed by allocating the recording positions of ink particles, in terms of matrix, within a unit area on the recording paper by using more than 2 colors of 6 standard colors comprising 3 primary colors and other mixed colors. CONSTITUTION:Four sets of a mechanism composed of a nozzle 1, a piezoelectric element 2, a charge electrode 4 and a gutter 7 for recovery are provided for each ink of cyanine, magenta, yellow and black for single color recording and deflection electrodes 5, 6 are used commonly for all colors. For a dot 9 for recording, one of 6 colors, namely, cyan, magenta, yellow, blue obtained by mixing cyan and magenta, green obtained by mixing cyan and yellow and red obtained by mixing magenta and yellow, is allocated by the deflection of an ink particle 3 in the direction of Y and by the movement of the nozzle 1 or a recording paper 8 in the direction of X. Blue, green or red is caused to form by overlapping and recording ink of 2 colors at the same position on the recording paper 8. The larger the number of matrix, mXn, is made, the more closer to natural hue the color reproduction becomes.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of composing a color image using an inkjet recording method, in which color ink particles are 1) allocated in a risk-wise manner to construct an image.

Conventional inkjet devices of this type are mainly used for one single color, and in the case of a single color, the method of expressing grayscale images is 1) The size of the generated ink droplet is modulated with an image signal to record the dot diameter. methods for changing the size of
A method in which ink particles are formed into a mist and their density is modulated by image signals.

There is a method of changing the apparent thickness of the upper recording scanning line by changing the number of ink droplets recorded between the scanning line pitches. However, it is difficult to directly apply these methods as a color image expression method using color ink, and even if they are applied, the disadvantages are that the apparatus is complicated, difficult to control, and has poor stability. Also, if you simply use the same number of nozzles that eject ink as the number of color inks,
In order to reproduce natural color tones, a large number of inks and nozzles are required, making the device complex and large in size, and furthermore, there is a problem of reduced maintainability due to clogging.

This invention aims to eliminate these drawbacks.

Cyan, magenta, yellow, cyan and -f(
To configure an image by allocating the recording positions of six colors on the recording paper surface in a matrix manner: blue by mixing the colors of the printer, green by mixing the colors of cyan and yellow, and red by mixing the colors of magenta and yellow. This makes it possible to display the required color. Below, rlATMIK Tweet "c ko F) Mli &
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FIG. 1 is a schematic configuration diagram showing an example of an inkjet recording device used in the present invention, and 1 is an ink ejection nozzle (
(hereinafter simply referred to as a nozzle), 2 is a piezoelectric element, 3 is an ink particle, 4 is a charging electrode, s, 6 is a deflection electrode, 1 is a gutter for collecting unnecessary ink, and I is a recording paper.

The recording principle of such an inkjet recorder is to first apply pressure to the ink using a pressure device (not shown) and eject it from the nozzle 1. Ultrasonic vibrations are superimposed on this ink flow by the piezoelectric element 2 to generate ink particles 3. The ink particles 3, which have been given a charge amount according to the recording signal by the charging electrode 4, are transferred to the deflection electrode 5. to which a high voltage is applied. ! While passing through I, it is deflected by an amount of deflection proportional to the amount of charge, and a brass image is formed on the image forming paper 8. Ink powder unnecessary for recording is collected by a collecting gutter TkC. In the figure, [ is nozzle 1. Piezoelectric element 2. Four sets of charging electrodes 40 and collection gutter 1 are installed for each of cyan, magenta, yellow, and black ink for monochromatic recording, and the deflection electrode 5.6 is common to each ink.

FIG. 2 is a diagram showing the configuration of a color image using an inkjet recording method according to an embodiment of the present invention, where 9 is the number of recorded dots, m is the number of recorded dots in the horizontal direction, and n is the number of recorded dots in the vertical direction.

In this figure, recording dot 9 has cyan, magenta,
One color out of the six colors: yellow, blue by mixing cyan and magenta, green by mixing cyan and yellow, and red by mixing magenta and yellow, is controlled by deflection control of ink droplets 3 in the Y direction and nozzle 1 or The assignment is made by moving the image sheet 8 in the X direction. here.

For ink color mixtures of cyan and magenta, cyan and yellow, and magenta and yellow, for example, two colors of ink can be overlapped and recorded at the same recording position on the back side of the recording paper, respectively.

Develops green and red V colors.

The number of colors that can be represented when the recording positions of the ink droplets 3 are configured in a matrix manner is determined by the number m>y of the matrix dividing the unit product. In other words, the display possible when using six colors: the three primary colors of cyan, magenta, and yellow, the back by mixing schiff/magenta, green by mixing cyan and yellow, and red by mixing magenta and yellow. The number of colors is if l is an integer.

is given by

Here, for example, mX difficult a! 6.9.12, the number of colors that can be displayed is 462 colors, 2002 colors, and 618 colors, respectively.
With eight colors, it is possible to reproduce colors close to natural tones without increasing the matrix number mXn. In this case, the resolution of the human eye is an issue, but Middle F. Holmes (Middle@ton) on the spatial frequency characteristics of visual color discrimination
-He1m's) experiment, the resolution of color discrimination in the case of white-crystalline system is about 1OOμm at clear vision distance, but in the case of color, it is about 200μm for red-green, and about SOOμm for yellow-blue.
It is μm. In other words, the unit length of the color image configuration is 3
If it is 00 μmli degrees, even if the inside is composed of several colors, it is considered to be treated as a single color from the resolution of the human eye. For example, in an inkjet device, if the nozzle diameter is 30 μm, the atomization frequency is 110 KHz, and the ink flow rate is 20 m/a, a recording dot diameter of about 100 μm can be obtained on plain paper.
If the matrix mXn=9, it is possible to reproduce 2002 colors below the resolution of the human inner eye. Further, by using a monochromatic recording ink in addition to the three primary color inks of cyan, 1 zenta, and yellow as recording inks, the number of colors that can be expressed in one image is further increased.

Figure 3 shows an example of a color image composition by mixing six colors. EI X B xz 9
In the case of Figure 1, 10 is cyan ink, 11 is magenta ink, 12 is yellow ink, 13 is blue due to a mixture of cyan and magenta, 14 is green due to a mixture of cyan and yellow, and 15 is magenta and yellow ink. - Indicates red by mixing colors.

As described above in detail, the method of configuring color painters using the Infusiera)me@ method according to the present invention is as follows.

By using at least 4hZ color or more out of the three primary color inks of cyan, magenta, and yellow, blue by mixing cyan and magenta, green by mixing cyan and yellow, and red by mixing magenta and yellow, the ink particles are formed. Since the image area is divided within a unit area and C-v matrix on the surface of the recording paper at the image position, it is possible to display the desired color without increasing the complexity of the recording mechanism. It has the advantage of being

[Brief explanation of the drawing]

Figure 1 is a schematic configuration diagram showing an example of an inkjet recording device used in this invention, Figure 2 is a color image configuration diagram showing an embodiment of this invention, and Figure 3 is a color image configuration of a six-color mixture. This is an example. In the figure, 1 is a nozzle, 2 is a piezoelectric element, 3 is an ink particle, and 4 is a piezoelectric element.
is a charging electrode, 5.6 is a deflection electrode, T is a collection gutter, 8
is recording paper, 9 is image forming dot), 10 is cyan ink, 1
1 is magenta ink, 12 is yellow ink, 13 is blue, 14 is green, and 15 is red. Figure 1 Figure 2 Figure 3 Figure 3

Claims (1)

[Claims] In the Infusiera) lee system, which uses an inkjet device that ejects ink from an ink ejection nozzle toward recording paper for recording, cyan. Magenta and yellow inks are ejected from separate ink ejection nozzles to form ink particles, and cyan, magenta, and yellow ink are used, as well as blue by mixing cyan and magenta, and a mixture of cyan and yellow. green, f
By dividing ink particles of at least two colors of at least two of the six colors of red by mixing f-zenta and yellow p-color into a recording position on the recording paper surface in a matrix manner within a unit area, an image is formed. A method of composing a color image using an inkjet town record method, which is characterized by performing color display.