JPS581562A - Apparatus for forming color image - Google Patents

Abstract

PURPOSE:To provide the titled apparatus capable of obtaining good image quality free from color protrusion, wherein different color inks are mixed corresponding to color component ratio corresponding to a formed color image and scanned and recorded on a recording member by a common jet head. CONSTITUTION:The optical image of a multi-colored original O is subjected to color separation by each color separation filters 1, 2, 3 and concentrations thereof is measured every color component optical images by concn. measuring circuits 4, 5, 6 having photoelectric converters. By the sum signal of input signals from each concn. measuring circuits, a diluent liquid supply means 11 is controlled by a diluent concn. measuring circuit 7. In addition, supply means 8, 9, 10 are controlled by a controll signal whether the diluent liquid is supplied or not each color concn. measuring circuits. Each color ink, that is, the diluent liquid is introduced into a mixing nozzle 12 and the ink with desired color is injected to a member 13 to be recorded in desired concn. from a single nozzle.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel color image forming apparatus, and relates to a color image forming apparatus capable of obtaining color images with excellent running quality.

Conventionally, when forming a color image using an inkjet, the color ink was jetted onto a recording medium using a special ink cartridge for each color to record it on the recording medium.・Midashi occurs,
It was not always possible to obtain a good color image.

Furthermore, in order to reproduce the shading of the original image, it was necessary to use the dot method, making it extremely difficult to form images with gradation.

The present invention has been made in view of the above points, and relates to a color image forming apparatus that makes it possible to obtain good color images.

The present invention is characterized in that different colored inks are mixed according to the corresponding color component ratios of the formed color image, and a color image is obtained by scanning and recording (scanning) using a common in-on jet head.

Hereinafter, details of the present invention will be explained by way of specific examples with reference to the drawings.

FIG. 1 is a block diagram illustrating the configuration of the apparatus of the present invention.

The light image of the multicolor original 0 is separated into colors by color separation filters 1.degree. 2.3, and the density of each color component light image is measured by density measurement circuits 4, 5.6 having photoelectric conversion elements. In other words, the red of the manuscript (
The R) component light image is filtered through the R2 color component pH filter 1 (7
, the necessity of measuring the R component concentration and its dilution ratio (V;
Maximum yuan! :1. When the minimum light 1 is O, the percentage) is determined. That is, when the amount of R component light is 0, the Y color ink is not diluted, and when the amount of R component light is 1, the Y color ink is turned off. Then, one signal required for dilution is transferred to the dilution concentration measuring circuit 7. Similarly, the N (G) component light f'l N of the original is
Through the G color separation filter 2, the G component concentration is measured and its dilution ratio is determined. Also at this time, when the G component light amount is O, the M color ink is applied without dilution, and when the G component light amount is 1, the M color ink is turned off. And the phrase signal required for dilution is 7 ml of dilution! It is transferred to the imt measurement circuit. Also, a light signal of a blue (B) component light image of the original is inputted to the density measuring circuit 6-\ through the B color separation filter 3. Then, the necessity of supplying cyan (C) color ink and the rate of its dilution are determined. The tampering signal is then transferred to the dilution concentration calculation circuit. In the diluted concentration open side circuit 7, the diluted liquid supply means 11 is controlled by the sum signal of the input signals from the R, G, and B rockiness measurement circuits. Further, as described above, each color density stage 8, 9, and 10 are controlled.

In the apparatus according to the embodiment of the present invention, the inks of each color are not directly jetted onto the recording member, but the inks of each color and diluent if necessary are guided to the 7JL joint nozzle 12, and the desired amount of ink is Records are made by spraying colored ink onto the recording section.

FIG. 2 is a front view showing a specific example of the configuration of the mixing nozzle portion, and FIG. 3 is a side sectional view.

Around the mixing nozzle 14, nozzles 15, 16, 17 for supplying ink of each color and a nozzle 8 for supplying a diluent are connected. Each supply nozzle is provided with a piezoelectric element 15□, 171, etc. and feeds a predetermined amount of each color ink and/or diluent into the mixing nozzle 14 in accordance with the output signals of the concentration measuring circuits 4, 5, 6.7.

An air flow 19 is sent to the mixing nozzle 14 in the ejection direction, and the mixed ink is ejected toward the surface of the recording member.

In this way, the surface of the recording member can be colored with a desired gradation density using a single spot. By performing recording scanning while reproducing a desired color using a single nozzle, it is possible to form a good color image without any color stains on the surface of the recording member.

FIG. 4 is a sectional view showing a modification of the supply section for supplying each color ink or diluent to the mixing nozzle.

21 is a supply nozzle similar to that described above, and 22 is a piezoelectric element for pressure feeding. In this example, the mixing nozzle 14
A piezoelectric element 23 is also provided at the end aperture portion 21a connected to the tip, and the piezoelectric element 23 is operated when a small amount of ink or diluent is supplied. With this configuration, color mixture and dilution density can be well controlled.

Furthermore, it goes without saying that the amount of color mixture may be controlled not only by changing the pressure intensity of the piezoelectric element but also by controlling the operating time of the piezoelectric element.

As described above in detail in the specific examples, the device of the present invention is excellent in realizing desired color image formation using a single nozzle, and the formed color image also has good image quality without color stains. I can do it.

Moreover, according to the present invention, the gradation density of the formed image can be well controlled, making it possible to form an extremely good color image.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a block diagram showing the configuration of the device 6) of the present invention, Fig. 2 is a front view of a concrete example mixing nozzle portion, and Fig. 3 is a
FIG. 2 is a side sectional view of the nozzle, and FIG. 4 is a sectional view of a modified example of the supply section. In the figure, 1, 2.3, color separation filter, 4, 5.6...
Color density measurement circuit, 7... Diluent concentration measurement circuit, 8, 9.
10 Color ink supply means, 11... diluent supply means'
1 12.14...Mixing nozzle. Method 1 Kasumi Yasushi device Morukasumi Haku 4 ■ z

Claims (1)

[Claims] (1) A color image characterized by mixing different color inks according to the ratio of corresponding color components of the formed color image and scanning and recording the mixture onto a recording member using a common inkjet head to obtain a color image. forming device,
. (2. The color image forming apparatus according to claim 1, wherein a predetermined amount of diluent is supplied to the common inkjet head in accordance with the density of the formed color image.