JPH0687222A - Liquid color image forming method and recorder - Google Patents

Abstract

PURPOSE:To obtain a sharp and high-density liquid color image by using black liquid having a relatively superior diffusivity and color liquid having a color different from the black liquid and a relatively superior permeability. CONSTITUTION:An alternate arrangement pattern in a boundary area consists of a yellow 100% solid part 9, a black correction part 10 after a boundary data correction, and a black image part 11 of only black ink. At a boundary between the area of the black correction part 10 recorded with the black ink superior in diffusivity and the area of the black image part 11 recorded with CMY ink superior in permeability, ink bleeding occurs. However, there is no problem on the image because of the condition that this area is recorded with the same color. On the other hand, at a boundary between the area of the black correction part 10 recorded with ink of a plurality of colors superior in permeability and the area of the soild part 9 recorded with yellow ink superior in permeability, though the ink are different from each other in color, the superior permeability of both the ink prevents an occurrence of ink bleeding regarded as a problem in the image formation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color image forming method and a recording apparatus capable of recording a color image clearly and with high density, and more specifically, yellow, magenta, cyan, or
The present invention relates to a color image forming method and a recording apparatus using a color liquid such as green, red, and blue, and a black liquid such as black. The present invention is applicable to paper, cloth, non-woven fabric, OHP
The present invention can be applied to all devices that use recording media such as paper, and specific applicable devices include printers, copiers, facsimiles, office equipment such as printers, mass-production equipment, and the like.

[0002]

2. Description of the Related Art In a conventional color liquid ejecting apparatus, black color is formed by mixing three color liquids of yellow, magenta, cyan, or green, red, and blue in a black recording area without black color. Method, a method in which a black liquid is created in advance for this method, and this is used for a black area, and a method for mixing a three-color mixture of black and black liquid in this method for a desired area in a color image. A method of selecting black and black is known. In these conventional color recordings, it is only necessary to consider which one of the black color due to the three-color liquid and the black color due to the black liquid is preferable, the black liquid and the three-color liquid have almost the same liquid characteristics. It was a premise to use it.

Further, as an ink recording apparatus for improving a color recording image, recording of color ink is sequentially added to the recording range while partially shifting within a predetermined recording range for each scanning of the scanning type recording means. US Pat. No. 4320
No. 406. As a modification of this recording method, Japanese Patent Laid-Open Nos. 2-231149 and 3-2 are available.
As described in JP-A-076653 and JP-A-3-231861, a method of forming a recorded image by changing the ink ejection state or the feed pitch of the recording medium in a scanning unit of a scanning inkjet recording apparatus is also available. Are known.

(Background Art) However, in the conventional liquid recording technology, the inventors of the present invention, when a color image is mainly used, make the image quality of a black region, especially a character of a character image, unclear, and conversely It was found that the color image tends to be unclear when mainly used. in this way,
In the conventional liquid color recording, it has been said that it is preferable to make the liquid characteristics equal to each color because the recording conditions can be easily controlled, but the essential problem remains unsolved.

This problem also occurs when the recorded image is improved by the above conventional technique.

Therefore, the inventors of the present invention pursued conditions that essentially affect a liquid color image and conditions for recording a black color clearly and with high density, and make essentially all liquid color images clear. The main object of the invention is to provide a liquid color image forming method and a recording apparatus capable of ensuring a high-density image.

On the other hand, in the course of research aimed at achieving this object, the present inventors found a special phenomenon in the case of increasing the characteristic difference between the color liquid and the black liquid. By elucidating this phenomenon, a progressive invention could be achieved to the following new technical problems. That is, if the surface-active agent is made to be about 4 to 6% in order to enhance the hue of the color liquid, and the black liquid is made to have a property of emphasizing permeability, these boundary regions Then, it was found that the solvent that enhances the diffusivity of the color liquid penetrates into the black region and disperses the black dye. This phenomenon was often seen when plain paper was used as a recording medium. In the case of the processed paper in which the recording medium has the liquid holding power, the difference was observed depending on the degree of processing.

A second object of the present invention is to solve this novel problem. Multi-faceted studies have been conducted in the study of the structure for achieving the second object, and many inventions of multiple elements have been produced from the inventions of elements. Typically, the present invention provides a recording method of the present invention, which forms a recording portion of the color ink of the present invention in place of the black ink in the black ink application portion of at least a part of the boundary area referred to in the present invention. .

The present invention solves a new problem that cannot be solved by the prior art, and causes film boiling due to the thermal energy of the prior art to eject ink droplets, thereby making the recording method and other recording improving techniques themselves more effective. A third object of the present invention is to provide a liquid color image forming method which can be utilized and which implements each of the present invention, and a recording apparatus using the same.

Other objects of the invention will be understood from the following description.

(Summary of the Invention) The following representative examples can be given as a list of the present invention which solves the above problems.

According to a first aspect of the present invention, a black liquid having a relatively excellent diffusivity is provided in order to provide a color image with a relatively clear image and a black image with a high density and a sufficient contrast. And a color liquid having a color different from that of the black liquid and having a relatively excellent permeability, and a liquid color image forming method.

The term "excellent in diffusivity" as used herein means that the permeation speed is relatively slow in order to realize high quality in which the density of the black image portion on the recording paper is high and feathering does not occur, and the ink stays on the surface of the paper. In addition, it is representative that it diffuses uniformly without being much influenced by the unevenness of the paper, and if it is relatively higher than the technical level, it is included in this expression. On the other hand, having excellent penetrability means that the penetrating speed into the recording paper is relatively increased and bleeding between different colors is prevented. Therefore, since the density tends to be slightly low, it may be corrected by increasing the dye density accordingly. Due to the relative difference in these characteristics, the color balance as a whole can be optimized by taking advantage of the respective colors.

A multifaceted examination of the constitution of the first invention as a comprehensive characteristic reveals a black liquid having relatively excellent surface activation characteristics (more specifically, a large surface tension), and the blackness. It was also found that a similar effect can be provided by using a color liquid having a color different from that of the liquid and relatively inferior in the surface active property (more specifically, having a small surface tension). Examining this more specifically, "acetylenol", which has not been noticed in the past, is most suitable, or a fluorine-based surfactant or a known surfactant is added in an amount of 0.5 to 15% by weight (preferably 1% by weight). Above 3
(Wt% or less), the surface activity characteristics are relatively decreased and the permeability is increased, and while the color characteristics other than black are sufficiently exhibited, the content is not contained or is relatively small ( It has also been found that it is possible to provide a proper balance relationship with black ink high density images. Physically speaking, it is important as one of the preferable conditions that the surface tension of the ink is equal to or smaller than the critical surface tension of the paper because of the action of the surface active property.

More preferable conditions are, as a single or synergistic factor, a black liquid containing urea and having a relatively excellent diffusivity, and a color different from that of the black liquid.
By using a color liquid containing not less than 15% by weight of urea and not more than 15% by weight of urea, and containing a relatively large amount of a surfactant such as acetylenol and having excellent penetrability, it is possible to achieve mutual fixation while achieving improvement in fixing property. It was possible to record while producing a diffusive self-regulatory effect.

On the other hand, it is possible to compare the total difference in characteristics including the diffusivity and the permeability of the liquid used by the amount of light reflection on the surface of the novel optical liquid whose liquid properties are defined in the present invention. And the difference in this characteristic is 100 mse
c or more, the characteristic difference is preferably 200 mse
As described above, it has been proved that the desired characteristic difference between the respective color images can be surely achieved by optimally setting the time to 500 msec or more. The preferable difference is that the permeation time is about 10 times, so that the high density of the black image and the sharpness of the color image can be made more remarkable. Therefore, ideally, the first color liquid having a permeation time of from several tens to several hundreds msec (preferably 100 msec) from the time when the light is reflected on the recording medium to the time when the amount of light reflected from the light surface suddenly changes,
A liquid color image forming method is characterized in that a second color liquid having a lower lightness than the first color liquid and having a permeation time of the order of seconds is used.

Next, the second aspect of the present invention is broadly divided into
It is an invention that solves a problem of permeation of a solvent that constitutes a liquid and an unexpected dispersion of a dye or a pigment (for example, bleeding between different colors) at a boundary portion which is caused by improving characteristics of different colors. The invention that solves this is, to a large extent, to form a barrier for dispersion prevention that solves these problems, or to form an error diffusion area that allows the dispersion to visually converge to an error range. . That is, firstly, a black liquid having relatively excellent surface activity characteristics, a plurality of color liquids having different colors from the black liquid and relatively poor surface activity characteristics, and the black liquid. A liquid color image forming method is characterized in that a black region serving as a boundary with the color liquid is formed with the plurality of color liquids. Alternatively, as a derivative recording method based on the same technical idea, a small amount of black liquid is applied to the plurality of color liquids as the boundary black region within a range not impairing the function as a dispersion preventing barrier. In addition, a liquid color image forming method in which the blackness is improved to the original blackness can be mentioned. As a result, image disturbance in the boundary area can be prevented, and desired characteristics given to each liquid can be made more prominent.

Further, in the latter liquid color image forming method, it is preferable to form the boundary black area including the black liquid because the density of the boundary area can be further improved.

To give a concrete example of the device invention, liquid jet recording means for jetting liquids of different colors onto a recording medium,
In a recording apparatus provided with a means for supplying a recording signal to the recording means, the recording signal supplying means ejects only a black liquid having relatively excellent diffusivity in a black single region such as a character. A signal for ejecting a color liquid having a color different from that of the black liquid and having a relatively excellent permeability to a single color region having a color different from that of the black liquid is And a signal for ejecting at least a plurality of different colors of the color liquid to a black area which is a boundary between the color liquid and the color liquid, to the recording means. The present invention can provide a high-density image while sharpening a character whose main object is black.

A more preferable aspect of the present invention is the one to which the above-mentioned condition of relatively surface active property is added. Furthermore, a black liquid containing urea and having relatively excellent diffusibility, and a color liquid having a different color from the black liquid and containing acetylenol and containing urea and having relatively excellent permeability, By using it, a practical liquid color image forming method with improved fixability can be carried out. Further, the above-mentioned acetylenol is preferably 0.5% by weight or more (preferably 3% by weight or more) of the color liquid, and the compounding under the above-mentioned conditions can be mentioned as a more preferable one.

Although the boundary area is strictly defined in the above invention, a partial ejection error may occur in an ink jet recording apparatus or an apparatus for performing durable recording.
It is also a preferable configuration to prevent the image from being affected even if such ejection disturbance occurs. Therefore, it is a boundary part of the black liquid application region that should be formed using only the black liquid, and at least a part of the boundary part, the application region using only the color liquid of a color different from the black liquid. Since the liquid color image forming method, which is characterized by forming, can automatically cope with any such inconvenience,
It can be said that the image formation is practical and safe.

By the way, it is particularly practical in a recording apparatus in which a plurality of scanning color ink supply units are provided at a predetermined interval in the scanning direction, and ink is recorded by an ink recording means in which the supply interval between adjacent supply units is on the order of 10 msec. Providing a configuration can be mentioned as a further effective invention of the present invention. In such a premise configuration, the following conditions are satisfied in order to satisfy the correlation until the image of each color is fixed in an appropriate state while ensuring an appropriate mixed state of the color inks in the boundary area. It is preferable to be satisfied. That is, the permeation time from the time of adhering to the recording medium until the amount of light reflected from the light surface suddenly changes is several tens to several hundreds msec (preferably 100)
msec) a first color liquid and a second color liquid having a lower lightness than the first color liquid and having a permeation time of the order of seconds and using only a black liquid. A boundary part of a black liquid application region to be formed by using, and at least a part of the boundary part has means for forming an application region using only a color liquid of a color different from the black liquid Is a recording device. This difference in order relation can synergistically improve the effects of the present invention.

A plurality of scanning color ink supply units are provided at a predetermined interval in a direction different from scanning, and the printing intervals of the adjacent supply units are on the order of seconds, so that the permeation time of the second color liquid is increased. The first color liquid and the second
The boundary area forming unit described above is also effective in a recording apparatus that records using an ink recording unit that reduces bleeding with the color liquid. Further, even in a recording apparatus having a structure in which the printing interval is sufficiently longer than the penetration time of the second color liquid having slow penetration, bleeding occurs in the boundary area when the drying is insufficient. In some cases, the present invention is effective.

Furthermore, the conventional image quality improving technique for ink recording,
By applying the present invention to the technology for solving the problem of color mixing of images, the present invention solves the above-mentioned problems, and as a result, only the advantages of the conventional technology are brought out by the present invention, and a synergistically excellent recording method is provided it can.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 2 includes a serial type embodiment of the ink jet recording apparatus of the present invention. The carriage (not shown) has colors corresponding to four colors of cyan C, magenta M, yellow Y and black Bk. A recording head 4 for recording is mounted, and a well-known guide shaft movably guides and supports the carriage. The carriage has a recording paper S, which is a recording medium such as paper, on the guide shaft by a drive motor which is a pulse motor driven by a motor driver.
Is driven so as to move along the recording surface of. As is well known, a conveying roller for conveying the recording sheet S, a guide roller for guiding the recording sheet S, a recording sheet conveying motor, and the like are provided as an apparatus structure, although they are not shown.

Further, each recording head has a liquid passage for ejecting ink droplets toward the recording paper S, an ink tank corresponding to each recording head 4Y, 4M, 4C, 4Bk, and an ejection provided in each liquid passage. An energy generating means (preferably an electrothermal converter that causes film boiling by heat energy) and the like are provided, and an ink ejection signal is selectively supplied via each head driver 5.

Specific components of the ink in this embodiment are as follows.

Bk ink water 82% by weight black dye 3% by weight glycerin 5% by weight urea 5% by weight thiodiglycol 5% by weight C ink water 77% by weight cyan dye 3% by weight glycerin 5% by weight urea 5% by weight thiodiglycol 5% by weight acetylenol 5% by weight M ink water 77% by weight magenta dye 3% by weight glycerin 5% by weight urea 5% by weight thiodiglycol 5% by weight acetylenol 5% by weight Y ink water 78% by weight yellow dye 2% by weight glycerin 5% by weight % Urea 5% by weight thiodiglycol 5% by weight acetylenol 5% by weight, Bk ink realizes good diffusivity on recording paper, has no feathering, and enables high-density recording with high density. There is. On the other hand, other color inks
In order to have excellent penetrability and to prevent bleeding between different colors, 5% by weight of acetylenol is added as a surfactant.
The permeation time into the recording paper is not simply determined by the surface tension of the ink, but is a major factor that affects the permeation time. The surface tensions for the above inks are 50 dyn / cm ^{2 for} Bk ink and 28 dyn for color inks.
/ Cm ² . The Bk ink is designed to have a much higher value than the color inks. Further, in the present embodiment, in the case of an ink droplet of 80 ng / drop, the permeation time based on the measurement of the amount of light reflected on the light surface depends on the recording paper,
About 5 sec with Bk ink, about 8 with other color inks
It is 0 msec.

FIG. 2 is an explanatory view of the essential portions of the invention for correcting the boundary area of the present invention.

The data processing means 6 having a CPU is provided with means 7 for correcting the boundary data described in the above-mentioned item of outline, and automatically changes the data in the boundary area RE according to the input information from the host 8. Then, the driver 5 is driven.

In the present embodiment, the detection of the boundary area is performed by the data processing in the recording apparatus. However, the data processing including the data correction of the boundary area RE is performed by the recording apparatus control software on the host. The data may be transferred to the recording device. Further, although it is transferred as Y, M, C data from the host, it may be transferred as Y, M, C, Bk or as R, G, B data.

The data processing for the boundary region RE correction is
First, it is determined whether or not there is a color image adjacent to the black image, and whether the black image is formed only by the black ink or the boundary portion is formed by a plurality of color inks according to the determination result. decide. In this embodiment, since the boundary data is corrected in the main body of the printing apparatus, the data transferred from the host is stored in the buffer, the black data is compared with other color data, and the boundary is detected.

FIG. 1 is a schematic diagram for explaining the first invention of the present invention.

In this figure, 1 is 100% of yellow
Solid, 2 is black 100% solid, and 3 is white paper, that is, a state in which the letter A is printed in black outline on a yellow background.

The CPU of the recording apparatus first checks the black data on the buffer sequentially from the upper left of the image.
At this time, the first time the black data is detected is when the check is approaching the part 2. When black data is present, it is determined whether or not there is an adjacent color image at the same position. Therefore, in this example, when yellow data of 1 is detected, it is determined to be a boundary with a different color, and boundary data correction is performed. I need. On the other hand, when approaching the white letter A,
The boundary portion of the black image is again formed, but since there is no image data of another color even if the color image adjacent to the same position is determined at this point, the boundary data correction is unnecessary. Therefore, in this example, boundary data correction is performed on the four outer sides of 2, and boundary data correction is not performed on the boundary portion between 2 and the blank character, and only black ink is printed. If only the black ink is recorded on the four outer sides of 2 which are in contact with the yellow image portion 1 without the boundary data correction, the bleeding occurs when plain paper is used as the recording medium as described above. The resulting border becomes unclear and the image deteriorates significantly.

FIG. 2 is an explanatory view of the essential portions of the invention for correcting the boundary area of the present invention.

A procedure for correcting image data will be described with reference to FIG. The data corresponding to the black image of the area P3 and the data corresponding to the yellow image of the area P1 are transferred from the host 8 to the data processing unit of the printing apparatus. In this example, data corresponding to a black image is transferred as Y, M, and C three-color overlay data, so the data processing unit 6
First, replace the three-color overlapping part with Bk data,
Store in the buffer in addition to the transferred Y, M, C data. Next, the Bk data is checked as described above to detect the presence / absence of the boundary RE of the black data. When the check of the Bk data in the buffer is completed, the boundary data correction is performed. As a result of the boundary data correction in this example, the correction unit RE (P2-P1) having a predetermined boundary width is deleted from the black data. On the contrary, the portion corresponding to the correction unit RE (P2-P1) is added to the Y, M, and C buffers according to the predetermined PCP. As a result, the print signal actually given to the print head 4 by the driver 5 has an area P as shown in FIG.
The image data includes yellow (1), areas (P2-P1) recorded in a plurality of colors according to a predetermined PCP, and black (P3-P2). On the recording paper S, a yellow portion is concentrically formed, a black correction portion recorded in a plurality of colors, and a black portion is recorded on the outer side.

FIG. 3 is a schematic view in which an alternating arrangement pattern (PCP) in which two pixels in the boundary area are cyan C pixels and overlapping pixels of magenta M and yellow Y is executed.

In this figure, 9 is a solid portion of 100% yellow, 10 is a black correction portion after boundary data correction, and 11 is a black image portion recorded only with black ink. Therefore, the original black image area was the area where 10 and 11 were combined. In this boundary data correction example, a plurality of colors are recorded in accordance with the PCP for the boundary width of 2 pixels. According to this example, at the boundary between the area 10 recorded with the Bk ink excellent in diffusivity and the area 11 recorded with the CMY ink excellent in permeability,
Although ink bleeding occurs, there is no problem on the image because it is an area originally assumed to be printed in the same color.
On the other hand, at the boundary between the area 10 recorded with a plurality of color inks having excellent penetrability and the area 9 recorded with the yellow ink having excellent penetrability, both inks having excellent penetrability are used. Therefore, even if the colors are different from each other, bleeding that does not cause a problem on the image does not occur. That is, a high-quality image is obtained in which the black density is high in the 11th part and there is no bleeding in the boundary portions of different colors between 9 and 10.

FIG. 4 shows an alternate arrangement pattern (PC
P) another pattern explanatory diagram, the sharp symbols (#) 1 to
8 shows an example. In the above boundary data correction example, C and MY are arranged alternately with respect to the boundary width of 2 pixels.
7 shows an example in accordance with a PCP corresponding to PCP # 7.
FIG. 5 is a schematic diagram showing five pixels in the boundary area in a CMY overlapping pattern. Alternate arrangement pattern (PC
P) and the boundary width may be selected or automatically set by the user according to the type of recording medium, the user's preference for blackness, image data, recording speed, recording mode such as black enhancement, and the like. Further, it may be set for each model according to the recording density, the type of ink, and the ejection amount.

In FIG. 4, PCP # 1 has a high density, but since the amount of ejected ink is large, it is suitable for a recording medium having a relatively high ink absorption capacity. The PCPs # 2 to # 5 may be appropriately selected according to the difference in color developability according to the type of recording medium and the preference of the user. PCPs # 6 and # 7 reduce the amount of ejected ink, and are a recording medium with a relatively low ink absorption capacity, high recording density, and image data and recording modes that are not a problem even if the density is slightly low. Etc. can be used. In the examples of PCP # 1 to 7, the boundary portion is recorded only with the CMY ink having excellent penetrability, but in PCP # 8, the Bk ink having poor penetrability is added to the CMY ink having excellent penetrability. Therefore, it is easy to bleed,
Since a corrected black color that is close to true black is obtained, it may be appropriately selected according to the absorption characteristics of the recording paper, etc., in consideration of the balance of bleeding with black ink.

In addition, at the boundary between the CMY ink having enhanced permeability and the Bk ink having excellent diffusibility, bleeding of the permeability imparting agent occurred in addition to image bleeding, and the black image portion was slightly whitish. In contrast to PCP # 8, by adding Bk ink that does not use a permeability imparting agent to the boundary correction portion, it is possible to reduce unevenness in the concentration distribution of the permeability imparting agent. Therefore, the uneven whiteness can be suppressed.

Further, in this case, since a corrected black color close to true black is obtained, all black data may be printed on the PC depending on the type of paper.
The recording may be performed with the black color corrected by P so that the data processing can be simplified and the recording mode that can improve the recording speed can be selected.

In FIG. 5, since the boundary width to be printed by PCP is wide, it is possible to use black ink having high density and less feathering. However, when the pixel density is low, the border width recorded in the corrected black of the PCP, which is slightly different from the original black, may be too wide to be conspicuous. Therefore, it is set in consideration of the blurring and the tint difference of the PCP part. Just do it. As described above, the boundary width may be set in consideration of the ejection error. Further, in order to correct the color difference and adjust the ink ejection amount, the ejection amount may be changed for each color in accordance with the selection of PCP.

Examples of other inks preferable for the present invention include:
Ink of the following composition may be used in which the penetrability of the black ink is slightly increased to improve the bleeding with respect to the above ink examples.

Bk ink water 82.9% by weight black dye 3.5% by weight triethylene glycol 5.0% by weight hexanetriol 7.0% by weight isopropyl alcohol 1.5% by weight acetylenol 0.1% by weight C ink water 83 0.0% by weight cyan dye 2.5% by weight triethylene glycol 5.0% by weight hexanetriol 7.0% by weight isopropyl alcohol 1.5% by weight acetylenol 1.0% by weight M ink water 83.0% by weight magenta dye 2 0.5% by weight triethylene glycol 5.0% by weight hexanetriol 7.0% by weight isopropyl alcohol 1.5% by weight acetylenol 1.0% by weight Y ink water 82.5% by weight yellow dye 1.5% by weight triethylene glycol 5.0 wt% Hexanetriol 7.0 wt% Isopropyl alcohol 2.5 wt% acetylenol 1.5 wt%

Further, as another example of the ink preferable in the present invention, instead of acetylenol which is an additive for imparting permeability in the above ink examples, permeability which is unlikely to deteriorate ejection characteristics such as repulsion and sticking. An example of an ink obtained by adding cyclohexanol to the CMY ink as an improving additive is shown below.

Bk ink water 71.0 wt% black dye 4.0 wt% diethylene glycol 20.0 wt% urea 5.0 wt% cyclohexanol 0.0 wt% C ink water 68.5 wt% cyan dye 3.5 Wt% diethylene glycol 20.0 wt% urea 5.0 wt% cyclohexanol 3.0 wt% M ink water 68.5 wt% magenta dye 3.5 wt% diethylene glycol 20.0 wt% urea 5.0 wt% cyclohexanol 3.0 wt% Y ink Water 69.5 wt% Yellow dye 2.5 wt% Diethylene glycol 20.0 wt% Urea 5.0 wt% Cyclohexanol 3.0 wt%

Also in the above two ink examples, the Bk ink realizes good diffusivity on the recording paper, has no feathering, and enables high-quality recording with high density. On the other hand, the other color inks have excellent penetrability, and in order to prevent bleeding between different colors, acetylenol or cyclohexanol or the like is added as a penetrating agent. The surface tensions of the above inks are 35 dyn / cm ² or more for Bk ink and 32 dyn / cm ² for color ink.
It is not more than cm ² . That is, the Bk ink is designed higher than the color inks in consideration of the viscosity. Also,
In any of the examples, in the case of an ink droplet of 80 ng / drop, the permeation time based on the above-mentioned measurement of the amount of light reflected on the light surface is
Although it depends on the recording paper, the desired image characteristics can be achieved by adjusting the permeation time of the Bk ink to 10 times or more that of other color inks.

The following cases were examined as comparative examples. Bk
When the penetrating agent was added to the ink in the same amount as the other color inks, the bleeding was improved, but the character quality was sometimes significantly reduced. On the contrary, when the penetrating agent of other color inks was decreased, the density increased, but the boundary bleeding was deteriorated even when the present invention was applied. The excellent effect of the present invention is also recognized from this comparative example.

[0052]

INDUSTRIAL APPLICABILITY The present invention has not been expected in the past.
Since the difference in each liquid characteristic is positively used,
The desired image could be formed as a more appropriate image. Further, according to the invention of the boundary region which solves the novel problem obtained in the research process of the present invention, there is an advantage that an excellent image can be formed even if the difference in each liquid characteristic is more remarkable. We were able to provide an image that was exceptionally better than before.

[Brief description of drawings]

FIG. 1 is a schematic diagram for explaining a first invention of the present invention.

FIG. 2 is an explanatory view of a main part of the invention for correcting a boundary area of the present invention.

FIG. 3 is a schematic diagram in which an alternating arrangement pattern (PCP) in which two pixels in a boundary region are cyan C pixels and overlapping pixels of magenta M and yellow Y are executed.

FIG. 4 is another pattern explanatory diagram of an alternating arrangement pattern (PCP) of boundary areas, showing examples of sharp symbols 1 to 8.

FIG. 5 is a schematic diagram showing five pixels in a boundary area in a CMY overlapping pattern.

[Explanation of symbols]

 7 Boundary data correction means

Front page continuation (72) Inventor Fumihiro Goto 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Masaya Uetsuki 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Tetsuro Inoue 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Hiromitsu Hirabayashi 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Shigetasu Nagoshi, Canon Inc., 3-30-2 Shimomaruko, Ota-ku, Tokyo

Claims (14)

[Claims] 1. A liquid color image forming method for forming a desired liquid color image on a recording medium using liquids of different colors, wherein a black liquid having relatively excellent diffusivity and the black liquid are provided. A liquid color image forming method comprising: using a color liquid having a different color and relatively excellent permeability. 2. A liquid color image forming method for forming a desired liquid color image on a recording medium by using liquids of different colors, and a black liquid having relatively excellent surface-active properties, and the black liquid. And a color liquid having a different color and relatively inferior surface-active properties, and a liquid color image forming method. 3. A liquid color image forming method for forming a desired liquid color image on a recording medium by using liquids of different colors, and a black liquid having relatively excellent surface-active properties, and the black liquid. Are formed by a plurality of color liquids having different colors and relatively inferior in surface active property, and a black region serving as a boundary between the black liquids and the color liquids is formed by the plurality of color liquids. And a liquid color image forming method. 4. The liquid color image forming method according to claim 3, wherein the black region serving as the boundary is formed including the black liquid. 5. A recording apparatus comprising liquid jet recording means for ejecting liquids of different colors onto a recording medium, and means for supplying a recording signal to the recording means, wherein the recording signal supply means is black only. In the character area, a signal for ejecting only a black liquid having relatively excellent diffusivity is applied, and a color different from the black liquid is applied to the character-only area, which is a color different from the black liquid. A signal for ejecting a color liquid having excellent penetrability, and a signal for ejecting at least a plurality of different colors of the color liquid in a black region which is a boundary between the black liquid and the color liquid, A recording device characterized by supplying to a recording means. 6. The recording apparatus according to claim 5, wherein the recording signal supply means supplies a signal for ejecting the black liquid to the boundary black area to the recording means. 7. A recording apparatus comprising liquid ejecting recording means for ejecting liquids of different colors onto a recording medium, and means for supplying a recording signal to the recording means, wherein the recording signal supplying means is black only. In the character area, a signal for ejecting only a black liquid having a relatively excellent surface active property and an excellent diffusivity is used, and a signal having a color different from the black liquid is different from the black liquid in the color-only area. A signal for ejecting a color liquid, which is a color and has relatively poor surface activity characteristics and excellent permeability, is provided at least in the black region serving as a boundary between the black liquid and the color liquid. A recording apparatus, wherein a signal for ejecting a plurality of different colors is supplied to the recording means. 8. The recording apparatus according to claim 5, wherein the recording signal supply unit supplies a signal for ejecting the black liquid to the boundary black region to the recording unit. 9. A liquid color image forming method for forming a desired liquid color image on a recording medium by using liquids of different colors, and a black liquid containing urea and having relatively excellent diffusivity, A liquid color image forming method comprising: using a color liquid having a color different from that of the liquid and containing urea and acetylenol and having relatively excellent permeability. 10. The liquid color image forming method according to claim 9, wherein the acetylenol accounts for 3% by weight or more of the color liquid. 11. A liquid color image forming method for forming a desired liquid color image on a recording medium by using liquids of different colors, and permeation from the time when the liquid surface is attached to the recording medium until the amount of light reflected from the light surface changes abruptly. A first color liquid having a time of 100 msec, and a second color liquid having a lower lightness than the first color liquid and having a permeation time of the order of seconds.
A method for forming a liquid color image, which comprises using 12. The liquid color image forming method according to claim 11, wherein the first color liquid is cyan, magenta, and yellow, and the second color liquid is black. 13. A liquid color image forming method for forming a desired liquid color image on a recording medium by using liquids of different colors, wherein a boundary portion of a black liquid applying region to be formed using only a black liquid is used. A liquid color image forming method, characterized in that an application area using only a color liquid having a color different from that of the black liquid is formed on at least a part of the boundary portion. 14. A plurality of scanning color ink supply units are provided at a predetermined interval in the scanning direction, and the printing interval between adjacent supply units is 1.
In a recording apparatus that performs recording using an ink recording unit of the order of 0 msec, a first color liquid having a permeation time of 100 msec from the time when the ink adheres to a recording medium until the amount of light reflected on the light surface changes rapidly, A second color liquid having a lower lightness than the one color liquid and having a permeation time of the order of seconds;
And a boundary part of a black liquid application region to be formed using only a black liquid, and at least a part of the boundary part is provided with a color liquid having a color different from that of the black liquid. A recording apparatus having means for forming an area.