JP7047943B2 - Liquid discharge device and image forming method - Google Patents

Description

The present invention relates to a liquid discharge device and an image forming method.

Conventionally, a liquid ejection device that ejects a liquid to form an image on a medium has been used. Among such liquid ejection devices, a liquid that forms a base layer (first image) by using ink for a base and forms a desired image (second image) by superimposing it on the first image and using color ink. A discharge device is used.
For example, Patent Document 1 discloses a technique of ejecting white ink as a first image (white printing) onto a medium and superimposing the first image on the first image to form a second image (color printing) using the color ink. ing.

Japanese Unexamined Patent Publication No. 2011-62946

In the conventional liquid discharge device that superimposes the first image and the second image, the second image is formed after the first image is formed. Then, the ink for forming the first image and the ink for forming the second image are separated, and only the ink for forming the first image is used at the time of forming the first image, and only the ink for forming the second image is used at the time of forming the second image. Was there. Further, when the region overlapping the first image in the second image includes a region having the same color as the first image in the lower layer (when the image formed as the second image has a portion having the same color as the first image), the lower layer Sometimes the color of the first image was used as it was.
However, when the first image and the second image are overlapped and formed, for example, the density of the white ink in the same color region is low, and when the ejection amount is increased in order to increase the density of the white ink, the white ink is released from the medium. Problems such as overflowing and bleeding, and taking time if the first image forming operation is divided into a plurality of parts in order to prevent the white ink from overflowing from the medium may occur.

Therefore, an object of the present invention is to appropriately form an image when the first image and the second image are superimposed and formed.

The liquid discharge device according to the first aspect of the present invention for solving the above problems is a support portion that supports a medium, a discharge portion that discharges liquid to the medium supported by the support portion, and a discharge portion. A first image forming operation in which a liquid is discharged to form a first image, and a second image forming operation in which a liquid is discharged from the discharging portion into the medium on which the first image is formed to form a second image. The control unit includes a control unit capable of executing the above, and the control unit has the same color when the region overlapping the first image in the second image includes a region of the same color as the first image in the lower layer. It is characterized in that a region is formed by both the first image forming operation and the second image forming operation.

According to this aspect, when the region overlapping the first image in the second image includes the same color region as the lower first image, the same color region is used for both the first image forming operation and the second image forming operation. Formed with. Therefore, the density of the image in the same color region can be increased, and the second image forming operation can be executed after the image is dried in the first image forming operation, so that the overflow of the liquid in the same color region can be suppressed, and the first Since it is not necessary to divide the image forming operation into a plurality of parts, the time can be shortened. Therefore, when the first image and the second image are overlapped and formed, the image can be appropriately formed.
In addition, "increasing the concentration" means increasing the discharge amount of the liquid (increasing the density of the liquid per unit area of the medium).

In the liquid discharge device according to the second aspect of the present invention, in the first aspect, the control unit determines the amount of liquid to be discharged for forming the same color region in the first image forming operation. It is characterized in that the amount of liquid discharged to form the same color region in the forming operation is larger than the amount of liquid discharged.

According to this aspect, the discharge amount of the liquid for forming the same color region in the first image forming operation is larger than the discharge amount of the liquid for forming the same color region in the second image forming operation. Therefore, a large amount of liquid can be effectively dried in the time from the execution of the first image formation operation to the execution of the second image formation operation, and the blurring of the image in the same color region can be effectively suppressed. ..

In the liquid discharge device according to the third aspect of the present invention, in the first aspect, the control unit determines the amount of liquid to be discharged for forming the same color region in the second image forming operation. It is characterized in that the amount of liquid discharged to form the same color region in the forming operation is larger than the amount of liquid discharged.

According to this aspect, the discharge amount of the liquid for forming the same color region in the second image forming operation is larger than the discharge amount of the liquid for forming the same color region in the first image forming operation. Therefore, it is possible to suppress the bleeding of the image (liquid) in the same color region accompanying the first image forming operation, and it is possible to suppress the formation of an image in the same color region in the state where the liquid is bleeding in the second image forming operation.

In the liquid discharge device according to the fourth aspect of the present invention, in any one of the first to third aspects, the control unit determines the size of the image forming the same color region in the second image forming operation. The first image forming operation is characterized in that the size of the image forming the same color region is smaller than the size of the image.

According to this aspect, the size of the image forming the same color region in the second image forming operation is made smaller than the size of the image forming the same color region in the first image forming operation. Therefore, it is possible to prevent liquids of different colors from being mixed and bleeding in the same color region and the adjacent region due to the discharge of the liquid in the second image forming operation.

In the liquid ejection device according to the fifth aspect of the present invention, in any one of the first to fourth aspects, the first image is a white image formed by using white ink, and the second image is formed. The image is a color image formed by using white ink and color ink of a color other than white, and the same color region is characterized by being formed by white ink.

According to this aspect, the first image is a white image formed by using white ink, and the second image is a color image formed by using white ink and color ink of a color other than white. , The same color region is formed by white ink. That is, the same color region is formed by using white ink in both the first image forming operation and the second image forming operation. Therefore, the base layer can be formed with white ink, and the same color region can be formed in white without deep bleeding.

In the liquid ejection device according to the sixth aspect of the present invention, in the fifth aspect, the white ink forming the same color region is the first white ink used in the first image forming operation and the second white ink. It is characterized by being different from the second white ink used in the image forming operation.

According to this aspect, the white ink forming the same color region is different between the first white ink used in the first image forming operation and the second white ink used in the second image forming operation. Therefore, the ejection conditions can be changed between the first image forming operation and the second image forming operation, and the ink composition can be changed according to the ejection conditions of the first image forming operation and the second image forming operation. can.

In the liquid ejection device according to the seventh aspect of the present invention, in the sixth aspect, the difference in ejection characteristics between the second white ink and the color ink is different between the first white ink and the color ink. It is characterized by being smaller than the difference in discharge characteristics.

According to this aspect, the difference in ejection characteristics between the second white ink and the color ink is smaller than the difference in ejection characteristics between the first white ink and the color ink. Therefore, in the second image forming operation, the second white ink and the color ink can be ejected under the same ejection conditions, and the control of the ejection portion becomes easy.
The "difference in ejection characteristics between the white ink and the color ink" means, for example, a difference in the ejection state when the white ink and the color ink are ejected at the same applied voltage and the same ejection frequency. This corresponds to the difference in physical property values (viscosity, surface tension, etc.) as a specific difference in ink, and the difference in physical property value between the second white ink and the color ink is the difference between the first white ink and the color. Corresponds to the fact that it is smaller than the difference in physical properties with ink.

The image forming method according to the eighth aspect of the present invention is an image forming method in a liquid ejection device including a support portion that supports a medium and a ejection portion that ejects liquid to the medium supported by the support portion. The first image forming operation of ejecting the liquid from the ejection portion to form the first image and the liquid being ejected from the ejection portion to the medium on which the first image is formed to form the second image. When the second image forming operation is executed, when the region overlapping the first image in the second image includes the same color region as the first image in the lower layer, the same color region is referred to as the first image. It is characterized in that it is formed by both the image forming operation and the second image forming operation.

According to this aspect, when the region overlapping the first image in the second image includes the same color region as the lower first image, the same color region is used for both the first image forming operation and the second image forming operation. Formed with. Therefore, the density of the image in the same color region can be increased, and the second image forming operation can be executed after the image is dried in the first image forming operation, so that the overflow of the liquid in the same color region can be suppressed, and the first Since it is not necessary to divide the image forming operation into a plurality of parts, the time can be shortened. Therefore, when the first image and the second image are overlapped and formed, the image can be appropriately formed.

The schematic perspective view which shows the printing apparatus which concerns on one Embodiment of this invention. The schematic front view which shows the printing apparatus which concerns on one Embodiment of this invention. The schematic plan view which shows the printing apparatus which concerns on one Embodiment of this invention. The block diagram of the printing apparatus which concerns on one Embodiment of this invention. The figure for demonstrating the image formation method which can be performed using the printing apparatus which concerns on one Embodiment of this invention. The flowchart of the image formation method which can be executed using the printing apparatus which concerns on one Embodiment of this invention. The figure for demonstrating the image formation method which can be performed using the conventional printing apparatus.

Hereinafter, the printing apparatus 1 according to the embodiment of the liquid ejection apparatus of the present invention will be described in detail with reference to the attached drawings.
FIG. 1 is a schematic perspective view of the printing apparatus 1 according to the present embodiment, and shows a state in which the medium support unit 2 is in the printing start position. Further, FIG. 2 is a schematic front view of the printing apparatus 1 of the present embodiment. FIG. 3 is a schematic plan view of the printing apparatus 1 of the present embodiment, and shows a state in which the medium support unit 2 is in the set position of the medium. In each of FIGS. 1 to 3, some constituent members are shown in a simplified manner.

The printing apparatus 1 of this embodiment includes a medium support unit 2 that moves in the moving direction A while the medium is supported by the support surface 8 of the tray 4 as a support portion.
Further, the printing apparatus 1 includes a medium transport unit 3 that transports the medium supported by the tray 4 in the moving direction A. The moving direction A is a direction including the direction A1 and the direction A2 in the direction opposite to the direction A1.
Further, the medium support unit 2 is detachably mounted on the stage 5. Here, the attachment / detachment direction C of the medium support unit 2 with respect to the stage 5 is the vertical direction in the printing apparatus 1 of this embodiment. The medium support unit 2 moves in the direction (vertical direction) along the attachment / detachment direction C by rotating the lever 9 together with the stage 5. As shown in FIG. 2, the lever 9 is provided on the arm portion 11. Further, as the medium, various materials such as textiles (woven fabric, cloth, etc.), paper, vinyl chloride resin, and the like can be used.
The printing apparatus 1 of the present embodiment has a configuration including a support portion that supports the medium and moves in the moving direction A, but is not limited to such a configuration. For example, the medium may be supported while sliding on the support surface of the fixed support portion, and the medium may be conveyed.

Further, the inside of the main body of the printing apparatus 1 is provided with a print head 7 as a ejection unit capable of ejecting ink as an example of a liquid and printing on a medium. Then, the printing apparatus 1 of the present embodiment reciprocates the carriage 6 provided with the print head 7 in the scanning direction B intersecting the moving direction A, so that the printing head 7 is reciprocated in the scanning direction B while reciprocating. Ink is ejected from the print head 7 onto a medium supported by the tray 4 to form a desired image.
In the printing apparatus 1 of this embodiment, the front side (lower left direction) of FIG. 1 is the setting position of the medium in the tray 4 (see FIG. 3). Then, after moving the tray 4 in which the medium is set in the direction A1 of the moving direction A to the printing start position on the back side (upper right direction) of FIG. 1, the tray 4 is moved in the direction A2 of the moving direction A. Print while.

Further, the printing apparatus 1 of this embodiment has a configuration capable of ejecting white ink and color ink (black ink, yellow ink, cyan ink, and magenta ink) from the print head 7. Then, after moving the tray 4 from the set position to the printing start position, the first image forming operation is executed by forming the first image as the base layer with white ink while moving the tray 4 in the direction A2. Then, after moving the tray 4 to the printing start position again, the tray 4 is moved in the direction A2 to form a second image, which is a desired image, using color ink (white ink is also used depending on the image). As a result, the second image forming operation is executed. The details of the image forming method performed by using the printing apparatus 1 of this embodiment will be described later.
Here, the printing apparatus 1 of the present embodiment has a configuration in which white ink and color ink can be ejected from the print head 7, but the configuration is not limited to such a configuration. For example, metallic color ink may be used instead of white ink. That is, the first image may be formed of metallic color ink, and the second image may be formed by using color ink (black ink, yellow ink, cyan ink and magenta ink) and, depending on the image, metallic color ink. good. As the color ink, inks of colors other than the above-mentioned colors (for example, light cyan ink, light magenta ink, orange ink, green ink, blue ink, etc.) may be used.

The printing device 1 of the present embodiment includes a print head 7 as a ejection unit that prints while reciprocating in the scanning direction B, but a plurality of nozzles for ejecting ink are provided in an intersecting direction intersecting the moving direction of the medium. A printing device including a so-called line head may be used.
Here, the "line head" is provided so that the area of the nozzle formed in the crossing direction intersecting the moving direction of the medium can cover the entire crossing direction, and the print head or the medium is relatively moved. It is a print head used in a printing apparatus for forming an image. It should be noted that the area of the nozzle in the crossing direction of the line head may not be able to cover the crossing direction of all the media supported by the printing apparatus.

Next, the electrical configuration of the printing apparatus 1 of this embodiment will be described.
FIG. 4 is a block diagram of the printing apparatus 1 of this embodiment.
The control unit 19 is provided with a CPU 20 that controls the entire printing apparatus 1. The CPU 20 is connected to a ROM 22 that stores various control programs and the like executed by the CPU 20 and a RAM 23 that can temporarily store data via the system bus 21.

Further, the CPU 20 is connected to the head driving unit 24 for driving the print head 7 via the system bus 21.
Further, the CPU 20 is connected to the motor drive unit 25 via the system bus 21. The motor drive unit 25 is provided in the carriage motor 26 for moving the carriage 6 provided with the print head 7, and in the medium transport unit 3 for transporting the medium (that is, moving the medium support unit 2). It is connected to the carriage motor 27.
Further, the CPU 20 is connected to the input / output unit 28 via the system bus 21. The input / output unit 28 is connected to a PC 29 for transmitting / receiving data such as print data and signals.
The control unit 19 controls the entire printing apparatus 1 by such a configuration, and causes the image forming method described later to be executed.

Next, an image forming method performed by using the printing apparatus 1 of this embodiment will be described.
FIG. 5 is a diagram for explaining a feasible image forming method using the printing apparatus 1 of the present embodiment. On the other hand, FIG. 7 is a diagram for explaining an image forming method that can be performed using a conventional printing apparatus. In FIGS. 5 and 7, the image Ip represents a desired image for the user (the image after the formation of the second image), the image I1 represents the image after the formation of the first image, and the image I2 represents the image after the formation of the first image. It represents the image after the formation of the second image. The upper part of the image I1 and the image I2 shows a conceptual diagram of a state in which the image is viewed from above, and the lower part shows a conceptual diagram of a state in which the image is viewed from the side. Here, the image Ip in FIGS. 5 and 7 expresses a color by utilizing the region Rc that expresses a color using color ink (black ink, yellow ink, cyan ink, and magenta ink) and the color of white ink. This is an example of an image having a region Rw (that is, a region overlapping the first image in the second image and having the same color as the first image in the lower layer).
In FIGS. 5 and 7, the upper part of the image I1 and the image I2 shows the ink on the outermost surface with diagonal lines, and the lower part of the images I1 and the image I2 shows the ink ejected in the corresponding image forming operation with diagonal lines. ing.

First, an image forming method that can be executed using a conventional printing device will be described.
As shown in FIG. 7, when the image Ip is formed by using a conventional printing apparatus, first, the first image forming operation is executed to form the image I1 (image I1a). Here, in order to express the color by utilizing the color of the white ink in the region Rw, it is necessary to increase the density of the white ink. Therefore, as shown in the lower part of the image I1a, the ejection amount of the white ink ejected to the region Rw (the density of the ink per unit area of the medium) is larger than the ejection amount of the white ink ejected to the region Rc. Will also increase. However, if the ejection amount associated with one first image forming operation becomes too large, the ink will overflow. Therefore, in order to suppress the overflow of the ink and to make the region Rw a desired density, the first image forming operation is divided into two times. Specifically, following the first image forming operation for forming the image I1a, the first image forming operation for forming the image I1b is performed. In this example, the first image forming operation for forming the image I1a and the first image forming operation for forming the image I1b are exactly the same. That is, the amount of white ink ejected to the region Rc is equal to the white ink W1p forming the region Rc of the image I1a and the white ink W2p forming the region Rc of the image I2a. The amount of white ink ejected to the region Rw is equal to that of the white ink W1d forming the region Rw of the image I1a and the white ink W2d forming the region Rw of the image I2a. The white ink ejected in the first image forming operation is the white ink W1 (of which the white ink ejected to the region Rc is the white ink W1p and the white ink ejected to the region Rw is the white ink W1d). be. The white ink ejected in the second image forming operation is the white ink W2 (of which the white ink ejected to the region Rc is the white ink W2p and the white ink ejected to the region Rw is the white ink W2d). be.
Then, after completing the first image forming operation, the second image forming operation is executed to form the image I2. Here, as is clear from the image I2, in the conventional printing apparatus, only the color ink Co is ejected in the second image forming operation.
When the second image forming operation is executed after the first image forming operation for forming the image I1a, the density of the white ink in the region Rw becomes lower than the desired density.

Next, an image forming method that can be executed using the printing apparatus 1 of this embodiment will be described.
As shown in FIG. 5, when the image Ip is formed by using the printing apparatus 1 of this embodiment, first, the first image forming operation is executed to form the image I1. The image I1 in FIG. 5 is exactly the same as the image I1a in FIG. 7.
Then, after completing the first image forming operation, the second image forming operation is executed to form the image I2. Here, as is clear from the image I2, in the printing apparatus 1 of this embodiment, not only the color ink Co but also the white ink W2 is ejected in the second image forming operation.

As shown in FIG. 7, when the image Ip is formed by using a conventional printing apparatus, in order to suppress the overflow of ink in the region Rw and to make the region Rw a desired density, a three-step image is displayed. A forming operation was required.
On the other hand, as shown in FIG. 5, when the image Ip is formed by using the printing apparatus 1 of this embodiment, the printing time can be shortened because the image forming operation can be performed in two steps.

To summarize the above, the printing apparatus 1 of this embodiment includes a tray 4 that supports the medium and a print head 7 that ejects ink to the medium supported by the tray 4. Then, the control unit 19 ejects ink from the print head 7 to form a first image, and ejects ink from the print head 7 to a medium on which the first image is formed to form a second image. It is possible to carry out the second image forming operation of forming the above.
Further, when the region overlapping the first image in the second image includes the region Rw having the same color as the first image in the lower layer, the control unit 19 uses the region Rw for the first image forming operation and the second image forming operation. It is formed by both. Therefore, the density of the image in the same color region can be increased, and the second image forming operation can be executed after the image is dried in the first image forming operation, so that the overflow of the ink in the region Rw can be suppressed, and the first Since it is not necessary to divide the image forming operation into a plurality of parts, the time can be shortened. Therefore, when the first image and the second image are overlapped and formed, the image can be appropriately formed.
In addition, "increasing the density" means increasing the amount of ink ejected (increasing the density of ink per unit area of the medium).

Further, the control unit 19 of the present embodiment ejects the white ink W1 for forming the region Rw in the first image forming operation and the white ink W2 for forming the region Rw in the second image forming operation. It can be more than the amount. Therefore, a large amount of white ink can be effectively dried in the time from the execution of the first image formation operation to the execution of the second image formation operation, and the blurring of the image in the region Rw can be effectively suppressed. can.

On the other hand, the control unit 19 of the present embodiment ejects the white ink W2 for forming the region Rw in the second image forming operation more than the ejection amount of the white ink W1 for forming the region Rw in the first image forming operation. , You can do more. Therefore, it is possible to suppress the bleeding of the image (white ink W1) in the region Rw accompanying the first image forming operation, and it is possible to suppress the formation of an image in the region Rw in which the white ink W1 is bleeding in the second image forming operation. can.

Further, the control unit 19 of the present embodiment can make the size of the image forming the region Rw in the second image forming operation smaller than the size of the image forming the region Rw in the first image forming operation. .. Therefore, it is possible to prevent inks of different colors from being mixed and bleeding in the region Rw and the adjacent region with the ink ejection in the second image forming operation.

Further, as described above, the printing apparatus 1 of this embodiment includes white ink and color ink.
Then, in FIG. 5, the image I1 as the first image is a white image formed by using white ink, and the image I2 as the second image uses white ink and color ink of a color other than white. It is a color image formed by the above. Further, as shown in the image I2 of FIG. 5, the region Rw is formed by the white ink.
That is, the region Rw is formed by using white ink in both the first image forming operation and the second image forming operation. Therefore, in the printing apparatus 1 of the present embodiment, the base layer can be formed with white ink, and the region Rw can be formed in white without deep bleeding.
However, as described above, when forming the first image, other inks such as metallic color inks and color inks may be used instead of the white inks. Even when the first image is formed with ink of a color other than white ink, if the second image has a region of the same color as the first image (same color region), the same color region is formed by the same procedure as in this embodiment. can do.

Further, the printing apparatus 1 of this embodiment has a configuration in which only one type of white ink can be used.
However, the white ink forming the region Rw may be different from the first white ink used in the first image forming operation and the second white ink used in the second image forming operation. With such a configuration, the ejection conditions can be changed between the first image forming operation and the second image forming operation, and the ink composition is adjusted according to the ejection conditions of the first image forming operation and the second image forming operation. Can be different.

Further, in such a configuration, it is preferable that the difference in ejection characteristics between the second white ink and the color ink is smaller than the difference in ejection characteristics between the first white ink and the color ink. This is because in the second image forming operation, the second white ink and the color ink can be ejected under the same ejection conditions, and the control of the ejection portion becomes easy.
The "difference in ejection characteristics between the white ink and the color ink" means, for example, a difference in the ejection state when the white ink and the color ink are ejected at the same applied voltage and the same ejection frequency. This corresponds to the difference in physical property values (viscosity, surface tension, etc.) as a specific difference in ink, and the difference in physical property value between the second white ink and the color ink is the difference between the first white ink and the color. Corresponds to the fact that it is smaller than the difference in physical properties with ink.

Next, an image forming method that can be executed using the printing apparatus 1 of this embodiment will be described in more detail using a flowchart.
FIG. 6 is a flowchart of an image forming method that can be executed using the printing apparatus 1 of this embodiment.

When the print data is input from the PC 29 and the image forming method of the present embodiment is started, first, in step S110, the control unit 19 determines whether or not the image to be printed has the same color region (region Rw). In this embodiment, the first image is white. Therefore, specifically, whether or not the print data corresponding to the second image has a white region determines whether or not the print data has the same color region. If the control unit 19 determines that there is no same color region in this step, the process proceeds to step S120, and if the control unit 19 determines that the same color region exists in this step, the process proceeds to step S140.

In step S120, as the first image forming operation, the first image is uniformly formed with white ink, and the process proceeds to step S130.
Then, in step S130, as the second image forming operation, the second image is formed with the color ink based on the print data, and when the formation of the second image is completed, the image forming method of this embodiment is completed.

On the other hand, in step S140, as the first image forming operation, the first image is formed with white ink so that the region Rw is darker than the region Rc, and the process proceeds to step S150.
Then, in step S150, as the second image forming operation, the second image is formed with the color ink for the region Rc and the white ink for the region Rw based on the print data, and the formation of the second image is completed. Therefore, the image forming method of this embodiment is terminated.

As described above, the image forming method of the present embodiment is an image forming method in the printing apparatus 1 including the tray 4 that supports the medium and the print head 7 that ejects ink to the medium supported by the tray 4.
Then, the first image forming operation (step S120, step S140) in which the ink is ejected from the print head 7 to form the first image, and the ink is ejected from the print head 7 to the medium on which the first image is formed to form the first image. The second image forming operation (step S130, step S150) for forming the two images is executed. At that time, when the region overlapping with the first image in the second image includes the region Rw having the same color as the first image in the lower layer (when proceeding from step S110 to step S140), the region Rw is used as the first image forming operation. It is formed by both (step S140) and the second image forming operation (step S150).
Therefore, the density of the image in the region Rw can be increased, and the second image forming operation can be executed after the image is dried in the first image forming operation, so that the overflow of the ink in the region Rw can be suppressed, and the first Since it is not necessary to divide the image forming operation into a plurality of parts, the time can be shortened. Therefore, when the first image and the second image are overlapped and formed, the image can be appropriately formed.

It should be noted that the present invention is not limited to the above examples, and various modifications can be made within the scope of the invention described in the claims, and it goes without saying that they are also included in the scope of the present invention.

1 ... printing device (liquid ejection device), 2 ... medium support unit, 3 ... medium transfer unit,
4 ... Tray (support part), 5 ... Stage, 6 ... Carriage, 7 ... Print head (discharge part),
8 ... Support surface, 9 ... Lever, 11 ... Arm part, 19 ... Control part, 20 ... CPU,
21 ... system bus, 22 ... ROM, 23 ... RAM, 24 ... head drive unit,
25 ... motor drive unit, 26 ... carriage motor, 27 ... transfer motor,
28 ... Input / output unit, 29 ... PC, Co ... Color ink, I1 ... Image after first image formation,
I2 ... Image after formation of the second image, Ip ... Image desired by the user,
Rc: An area that expresses color using color ink,
Rw: Area that expresses color by utilizing the color of white ink (same color area),
W1 ... White ink ejected in the first image forming operation,
W2 ... White ink ejected in the second image forming operation

Claims (6)

A support part that supports the medium and
A discharge section that discharges the liquid to the medium supported by the support section, and a discharge section.
The first image forming operation of ejecting a liquid from the ejection portion to form a first image composed of a first color, and the first image forming operation of ejecting the liquid from the ejection portion to the medium on which the first image is formed. A control unit capable of forming a second image forming operation including a region of a second color different from that of the first color is provided.
The control unit is a region of the first image that overlaps with the same color region when the region of the second image that overlaps with the first image includes a region of the same color as the first image in the lower layer. The first image is formed by increasing the discharge amount of the liquid of the first color in one region as compared with the second region which is the region of the first image that does not overlap with the same color region. The liquid discharge is characterized in that the liquid of the second color is discharged into the region of two colors and the liquid of the first color is discharged into the region of the same color to form the second image. Device. In the liquid discharge device according to claim 1,
The control unit makes the discharge amount of the liquid for forming the same color region in the first image forming operation larger than the discharge amount of the liquid for forming the same color region in the second image forming operation. A liquid discharge device characterized by the fact that. In the liquid discharge device according to claim 1,
The control unit makes the discharge amount of the liquid for forming the same color region in the second image forming operation larger than the discharge amount of the liquid for forming the same color region in the first image forming operation. A liquid discharge device characterized by the fact that. The liquid discharge device according to any one of claims 1 to 3.
The control unit is characterized in that the size of the image forming the same color region in the second image forming operation is made smaller than the size of the image forming the same color region in the first image forming operation. Liquid discharge device. In the liquid discharge device according to any one of claims 1 to 4.
The first color is white, and the first image is a white image formed by using white ink as the liquid.
The second image is a color image formed by using the white ink and the color ink of a color other than white.
The liquid ejection device characterized in that the same color region is formed by the white ink. An image forming method in a liquid discharge device including a support portion that supports a medium and a discharge portion that discharges a liquid to the medium supported by the support portion.
The first image forming operation of ejecting a liquid from the ejection portion to form a first image composed of a first color, and the first image forming operation of ejecting the liquid from the ejection portion to the medium on which the first image is formed. When executing the second image forming operation of forming the second image including the region of the second color different from the color of 1.
When the region of the second image that overlaps with the first image includes a region of the same color as the first image in the lower layer, the region of the first image that overlaps with the region of the same color is the region of the first image. The first image is formed by increasing the discharge amount of the liquid of the first color as compared with the second region which is the region of the first image that does not overlap with the same color region, and the region of the second color is formed. An image forming method, characterized in that the second image is formed by discharging the liquid of the second color and discharging the liquid of the first color into the same color region.

Images