JP2022147636A - Inkjet device - Google Patents

Abstract

To provide an inkjet device which can grasp a surface shape of a medium by injecting a test ink to the medium, and has no necessity for abolishing the medium to which the test ink adheres.SOLUTION: An inkjet device related to this invention performs: test ink injection processing for injecting a test ink to a medium from an injection head; adhesion pattern acquisition processing for acquiring an adhesion pattern of the test ink adhering to the medium on the basis of imaged data including the test ink which is imaged by an imaging device; a surface shape estimation processing for estimating a surface shape of the medium on the basis of the acquired adhesion pattern; color ink injection data correction processing for correcting the color ink injection data which are acquired in advance according to the estimated surface shape of the medium; and color ink injection processing for injecting a color ink to the medium from an injection head on the basis of the corrected color ink injection data. The test ink is a transparent ink, an ink having the same color as that of the medium, or an ink having the same color as that of a base.SELECTED DRAWING: Figure 1

Description

The present invention relates to an ink ejection device.

When printing on an uneven surface of a medium, if the surface shape of the medium can be grasped in advance, the ink can be landed at an appropriate position, and printing without distortion can be performed. The surface shape of the medium can be grasped by using a device such as a laser measuring instrument, but an apparatus equipped with such a device has a complicated structure and an increased manufacturing cost.

Therefore, an apparatus has been proposed in which test ink is ejected onto a medium in advance and the surface shape of the medium is determined based on the displacement of the landing position of the test ink (see Patent Document 1 below). According to such an apparatus, for a medium having the same surface shape as the medium on which the test ink is ejected, ink (color ink) can be landed at an appropriate position in consideration of the surface shape.

JP 2010-89286 A

By the way, since the test ink ejected onto the medium may affect the color development by the color ink, the medium to which the test ink adheres is discarded. However, discarding the media leads to an increase in the manufacturing cost of the remaining media, which is a serious problem especially for media that are manufactured in small quantities and in many types.

In view of such circumstances, the present invention provides an ink ejecting apparatus that can grasp the surface shape of a medium by ejecting test ink onto the medium and that does not require disposal of the medium to which the test ink has adhered. intended to provide

An ink ejecting apparatus according to an aspect of the present invention includes an ejecting head that ejects ink onto a medium, an imaging device that includes an imaging device that captures an image of the ink adhered to the medium, and a control device, wherein the control device a test ink ejection process for ejecting the test ink from the ejection head onto the medium; and an adhesion process for obtaining an adhesion pattern of the test ink adhered to the medium based on imaging data including the test ink captured by the imaging device. pattern acquisition processing; surface shape estimation processing for estimating the surface shape of the medium based on the acquired adhesion pattern; and color ink for correcting previously acquired color ink ejection data according to the estimated surface shape of the medium. and a color ink ejection process for ejecting color ink from the ejection head onto the medium based on the corrected ejection data for color ink, wherein the test ink is transparent ink, the Ink of the same color as the medium or ink of the same color as the base.

According to this configuration, the surface shape of the medium can be grasped by ejecting the test ink onto the medium. Furthermore, in this configuration, the test ink is transparent ink, ink of the same color as the medium, or ink of the same color as the substrate. In this case, when the color ink is ejected after the test ink is ejected, there is almost no difference in color development due to the color ink between the portion to which the test ink adheres and the portion to which the test ink does not adhere. Therefore, by using the test ink as described above, the medium on which the test ink is adhered can be used as it is, and there is no need to discard it.

According to the above configuration, it is possible to provide an ink ejection device that can grasp the surface shape of a medium by ejecting the test ink onto the medium, and does not need to discard the medium to which the test ink has adhered. .

FIG. 1 is a schematic diagram showing the overall configuration of an ink ejection device. FIG. 2 is a block diagram of the configuration of the control system of the ink ejection device. FIG. 3 is a flow diagram of an ink ejection program. FIG. 4 is a diagram comparing the adhesion pattern and the reference pattern.

(overall structure)
An ink ejection device 100 according to an embodiment of the present invention will be described below. First, the overall configuration of the ink ejection device 100 will be described. The ink ejection device 100 according to the present embodiment is a UV printer that irradiates ultraviolet light to ink adhered to a medium 101 to cure the ink. However, the ink ejection device 100 is not limited to a UV printer.

FIG. 1 is a schematic diagram showing the overall configuration of an ink ejection device 100. As shown in FIG. The medium 101, which is the object to be printed in this embodiment, is an object having a three-dimensional shape with irregularities on its surface, and has a certain degree of surface roughness. Incidentally, in FIG. 1, a semicircle on the surface of the medium 101 indicates test ink, which will be described later. An ink ejection device 100 according to this embodiment includes an ejection head 10 , an irradiation device 20 , and an imaging device 30 . These constituent elements will be described in order below.

<Ejection head>
The ejection head 10 is a device that ejects ink onto the medium 101 . The ejection head 10 is mounted on a carriage 40 and ejects ink while moving together with the carriage 40 . The carriage 40 is moved in the horizontal direction (scanning direction) of FIG. 1 and in the direction perpendicular to the paper (sub-scanning direction) by a carriage driving device 41 (see FIG. 2). However, the carriage 40 does not move in the direction perpendicular to the plane of the paper, and instead, the table on which the medium 101 is placed may move in the direction perpendicular to the plane of the paper.

The ejection head 10 ejects ink in a direction perpendicular to the surface of the medium 101 (downward in the plane of FIG. 1). Further, the carriage 40 moves in a direction along the surface of the medium 101 (rightward on the paper surface of FIG. 1). Therefore, when viewed from the medium 101 , the ink is ejected from a direction that is inclined with respect to the direction perpendicular to the surface of the medium 101 . As a result, when the surface of the medium 101 has unevenness, if ink is ejected in the same way as when the surface is flat (in other words, when the surface has no unevenness), a picture or the like appears distorted on the medium 101. There is a risk.

Base ink, color ink, and coating ink are ejected from the ejection head 10 of the present embodiment. Both inks are photocurable inks that are cured by light (ultraviolet light in this embodiment).

The base ink is ink that is jetted onto the medium 101 to form a base on the surface of the medium 101 before the color ink is jetted. The base ink includes primer ink and white ink. The primer ink is transparent and can improve the adhesion between the color ink and the medium 101 . The white ink is white and can improve the color developability of color inks.

Color ink is ink that expresses a picture or the like on the medium 101 . For example, color inks include black ink, cyan ink, magenta ink, and yellow ink. Various colors are expressed by combining these inks. However, the inks included in the color inks are not limited to these.

The coating ink is ink that forms a coating layer by being ejected after the color ink is ejected. The coating ink is transparent. By adjusting the surface roughness of the coating layer, it is possible to express matte or glossy appearance.

<Irradiation device>
The irradiation device 20 is a device that irradiates the surface of the medium 101 with light. The irradiation device 20 is mounted on the carriage 40 . The light emitted from the irradiation device 20 includes visible light for imaging and ultraviolet light for ink curing. In addition, the irradiation device 20 may be divided into a portion for irradiating visible light and a portion for irradiating ultraviolet light.

When the ink ejected onto the medium 101 is droplet-shaped, the ink is formed in a hemispherical shape on the medium 101 immediately after ejection, and the ink gradually spreads over the medium 101 as time passes. Therefore, by adjusting the time from ink ejection to curing (or temporary curing) (hereinafter referred to as “curing time”), it is possible to set the shape of the ink after curing (ink height). can. Adjustment of the curing time will be described later.

Further, the irradiation device 20 irradiates the surface of the medium 101 with light from an oblique direction. Specifically, when the point on the medium 101 imaged by the imaging device 30 is used as a reference, the irradiation angle α of the light emitted by the irradiation device 20 with respect to the surface of the medium 101 (actually, with respect to the moving direction of the imaging device 30) is , 0 to 15 degrees. Such an irradiation method is called a dark-field illumination method. By applying light to the surface of the medium 101 from a direction close to horizontal, the light reflected from the surface hardly reaches the surface in a direction perpendicular to the surface. The light striking the ink adhered to the surface of the medium 101 scatters (irregularly reflects) in all directions regardless of the direction from which it originally came, so that the contrast becomes clear.

<Imaging device>
The image capturing device 30 is a device that captures an image of ink adhering to the medium 101 . The imaging device 30 is mounted on the carriage 40 . The imaging device 30 of this embodiment takes an image from a direction perpendicular to the surface of the medium 101 (actually, perpendicular to the moving direction of the imaging device 30). As described above, in this embodiment, the irradiation device 20 irradiates the surface of the medium 101 with light so that the irradiation angle α is 0 to 15 degrees. As described above, since the dark field illumination method is used in the present embodiment, even if the ink is a color that is difficult to see, such as transparent or white, the ink can be recognized from the imaging data of the imaging device 30 .

Further, the imaging device 30 of this embodiment performs imaging using a CCD (charge-coupled device) type sensor. A CCD sensor is a sensor formed by combining a CCD, a lens, and a mirror. A CCD sensor has a deeper depth of field than a CIS sensor that is often used in general scanners. Therefore, according to the imaging device 30 of the present embodiment, ink that is cured while having a three-dimensional shape, for example, ink that is cured while maintaining a substantially hemispherical shape at a certain height or more without spreading after ejection is also clear. can be imaged.

(Control system configuration)
Next, the configuration of the control system of the ink ejection device 100 will be described. FIG. 2 is a block diagram of the control system of the ink ejection device 100. As shown in FIG. As shown in FIG. 2, the ink ejection device 100 according to this embodiment includes a control device 50 . The control device 50 has a processor, a volatile memory, a nonvolatile memory, an I/O interface, and the like. The non-volatile memory of the control device 50 stores various programs including an ink ejection program, which will be described later, and various data, and the processor performs arithmetic processing using the volatile memory based on the various programs.

The control device 50 is electrically connected to the imaging device 30 . Thereby, the control device 50 can acquire the imaging data of the surface of the medium 101 including the adhered ink from the imaging device 30 .

Furthermore, the control device 50 is electrically connected to the ejection head 10 , the irradiation device 20 , and the carriage driving device 41 that drives the carriage 40 . The control device 50 controls the type of ink ejected from the ejection head 10, the ejection timing, the ejection speed, and the ejection amount per unit time by transmitting a control signal to the ejection head 10 (more precisely, the actuator of the ejection head 10). , and the size of the ejected ink (one drop) can be controlled. In addition, the control device 50 can control the intensity of the light emitted from the irradiation device 20 and the irradiation timing (turning on/off) by transmitting a control signal to the irradiation device 20 . Furthermore, the control device 50 can control the moving speed and moving direction of the carriage 40 by sending control signals to the carriage driving device 41 . Note that the ink deposition position on the medium 101 can be adjusted not only by controlling the ink ejection timing and ejection speed, but also by controlling the speed of the carriage 40 .

(Ink injection program)
Next, an ink ejection program executed by the control device 50 will be described. The ink ejection program is a program that ejects test ink to determine the surface shape of the medium 101, and then ejects base ink, color ink, and coating ink in order. FIG. 3 is a flow diagram of an ink ejection program.

<Test ink ejection processing>
As shown in FIG. 3, when the ink ejection program is started, the controller 50 first executes a test ink ejection process (step S1). The test ink ejection process is a process of ejecting test ink from the ejection head 10 onto the medium 101 . Here, a base ink, especially a transparent primer ink, is used as the test ink.

In the test ink ejection process, test ink is ejected based on predetermined test ink ejection data. The test ink ejection data is, for example, data such that when test ink is ejected onto a medium with a flat surface based on the data, a pattern of equally spaced dots appears on the surface of the medium. For example, if the carriage 40 is moved at a constant speed and the test ink is ejected from the ejection head 10 at a constant cycle, a dot pattern with even intervals appears on a medium with a flat surface. Even if the test ink is ejected based on such test ink ejection data, if the surface of the medium has unevenness, the test ink does not necessarily appear at regular intervals on the surface of the medium.

In the test ink ejection process, the test ink is not limited to be ejected so as to appear a dot pattern, and the test ink may be ejected so as to appear, for example, a grid line pattern. When the test ink is ejected so that a dot pattern appears, for example, one large droplet (approximately 10 picoliters) of test ink can express one dot, and the interval between adjacent dots can be set to about 1 mm. .

<Light irradiation treatment>
Subsequently, the control device 50 executes light irradiation processing (step S2). The light irradiation process is a process of irradiating light from the irradiation device 20 . As described above, the base ink, which is the test ink, is a photocurable ink that is cured by light. The shape of the cured test ink can be set by adjusting the curing time (time from ejection of the test ink to curing).

The adjustment of the curing time described above can be performed by changing the time from the ejection of the test ink to the irradiation of light. For example, if the carriage 40 is moved while ejecting the test ink from the ejection head 10 with the irradiation device 20 turned off, and after a predetermined time has passed, the carriage 40 is moved along the same route with the irradiation device 20 turned on. It is possible to adjust the time from the injection of the to the irradiation of the light. The curing time can also be adjusted by changing the intensity of the light emitted from the irradiation device 20. FIG.

In this embodiment, the curing time is adjusted according to the surface roughness of the medium 101 . Specifically, when the surface roughness of the medium 101 is higher than the reference roughness (that is, when the surface of the medium 101 is relatively rough), the curing time is adjusted to be longer than the predetermined reference curing time. If the curing time is long, the test ink will cure in a spread state, so the area where the test ink adheres will be flat and smooth, and the boundary between the area where the test ink adheres and the other area (rough surface area) will appear. becomes more prominent. As a result, recognition of the test ink is facilitated.

On the other hand, when the surface roughness of medium 101 is lower than the reference roughness (that is, when the surface of medium 101 is relatively smooth), the curing time is adjusted to be shorter than the reference curing time. If the curing time is short, the test ink is cured in a raised state, so the boundary between the portion where the test ink adheres and the other portion (portion with a smooth surface) is more likely to stand out. As a result, recognition of the test ink is facilitated.

The surface roughness of the medium 101 may be input by an operator through an input device (not shown). Alternatively, the ink ejection device 100 may be provided with a measuring device for measuring surface roughness, and the control device 50 may acquire the surface roughness of the medium 101 based on a measurement signal transmitted from the measuring device. The light irradiation process (step S2) may be executed in parallel with the test ink ejection process (step S1).

<Adherence pattern acquisition processing>
Subsequently, the control device 50 executes adhesion pattern acquisition processing (step S3). The adhesion pattern acquisition process is a process of acquiring a pattern of test ink adhered to the medium 101 (hereinafter referred to as “adhesion pattern”) based on imaging data including test ink captured by the imaging device 30 .

In this embodiment, as described above, the imaging device 30 performs imaging using a CCD sensor, and the irradiation device 20 irradiates the surface of the medium 101 with light from a direction that forms an angle of 0 to 15 degrees. A dark-field illumination method is used to capture images while moving. Therefore, even test ink of a color that is difficult to recognize can be reliably recognized, and the adherence pattern can be obtained with high accuracy.

<Surface shape estimation processing>
Subsequently, the control device 50 executes surface shape estimation processing (step S4). The surface shape estimation process is a process of estimating the surface shape of the medium 101 based on the adhesion pattern acquired in step S3. Specifically, by ejecting the test ink based on the test ink ejection data, the test ink pattern (hereinafter referred to as the “reference pattern”) appearing on the surface of the medium 101 having a flat surface and the adhesion pattern are generated. The surface shape of the medium 101 is estimated from the difference between the two.

FIG. 4 is a diagram comparing the adhesion pattern and the reference pattern. (a) of FIG. 4 shows the adhesion pattern in cross-sectional view, (b) shows the adhesion pattern in plan view, and (c) shows the reference pattern in plan view. The adhesion pattern of (b) corresponds to the adhesion pattern of (a). The semicircles in (a) of FIG. 4 indicate the test ink dots, and the dashed lines indicate the ejection direction of the test ink. Circles in (b) and (c) of FIG. 4 indicate test ink dots. The right side of FIG. 4 is the moving direction of the carriage 40 when the test ink is ejected.

As shown in FIG. 4, in the portion of the medium 101 where the surface becomes higher in the moving direction of the carriage 40, the test ink dot spacing in the deposition pattern is narrower than that in the reference pattern. Therefore, it can be inferred that the portion of the adhesion pattern where the test ink dot spacing is narrower than that of the reference pattern is inclined so that the surface becomes higher in the moving direction of the carriage 40 . Conversely, it is presumed that the portion of the deposition pattern where the test ink dot spacing is wider than that of the reference pattern is inclined so that the surface is lowered in the moving direction of the carriage 40 . be able to.

<Base Ink Ejection Data Correction Processing>
Subsequently, the control device 50 executes base ink ejection data correction processing (step S5). The base ink ejection data is data obtained in advance by the control device 50, and the base ink is ejected based on the data.

For example, when the base ink is ejected based on the base ink ejection data before correction (that is, when the control device 50 acquires the base ink ejection data), the thickness of the medium 101 is constant if the surface of the medium 101 is flat. A base is formed. On the other hand, if the surface of the medium 101 is uneven, there is a possibility that an underlayer having an uneven thickness will be formed. The base ink ejection data correction process is a process for correcting such base ink ejection data.

In the base ink ejection data correction process of this embodiment, correction is performed in two stages. First, as the first stage of correction, the base ink ejection data is corrected based on the surface shape of the medium 101 estimated in step S4. Specifically, the control device 50 corrects the base ink ejection data according to the surface shape of the medium 101 so that the thickness of the base is constant over the entire surface of the medium 101 . In this case, for example, in a portion of the medium 101 that is inclined so as to become higher in the traveling direction of the carriage 40 , correction is made so that the ejection amount of the base ink is reduced. Also, for example, in a portion that is inclined so as to become lower in the traveling direction of the carriage 40, correction is made so that the ejection amount of the base ink is increased.

After that, as a second stage of correction, the ejection data for the base ink is corrected based on the adhesion pattern of the test ink acquired in step S3. Specifically, the base ink ejection data is corrected so that the base ink does not adhere to the position of the medium 101 where the test ink is adhered. More specifically, the control device 50 generates mask data based on the adhesion pattern acquired in step S3, and corrects the base ink ejection data by multiplying the base ink ejection data by the mask data.

It should be noted that it is possible not only not to adhere the base ink to the position of the medium 101 where the test ink is adhered, but also to reduce the ejection amount of the base ink. Also, the ejection amount of the base ink may be reduced around the position where the test ink is adhered on the medium 101 . At this time, the above mask data is generated according to these processes.

<Base ink jetting process>
Subsequently, the control device 50 executes base ink ejection processing (step S6). The base ink ejection process is a process of ejecting the base ink from the ejection head 10 onto the medium 101 based on the base ink ejection data corrected in step S5. After the base ink is ejected, the base ink adhered to the medium 101 is irradiated with light to cure the base ink. As a result, a base having a uniform thickness is formed on the surface of the medium 101 .

<Color Ink Ejection Data Correction Processing>
Subsequently, the control device 50 executes color ink ejection data correction processing (step S7). The ejection data for color ink is data obtained in advance by the control device 50, and the color ink is ejected based on the data.

For example, when the color ink is ejected based on the color ink ejection data before correction (that is, when the control device 50 acquires the color ink ejection data), if the surface of the medium 101 is flat, the surface of the medium 101 is A distortion-free picture appears on the surface. On the other hand, if the surface of the medium 101 is uneven, a distorted picture may appear on the surface of the medium 101 . The color ink ejection data correction process is a process for correcting such color ink ejection data.

In the color ink ejection data correction process of this embodiment, the color ink ejection data is corrected based on the surface shape of the medium 101 estimated in step S4. Specifically, the control device 50 corrects the ejection data for color ink so that the picture appearing on the surface of the medium 101 is not distorted. In this case, for example, in a portion of the medium 101 that is inclined so as to become higher in the traveling direction of the carriage 40 , correction is made so that the color ink ejection interval is widened. Further, for example, in a portion that is inclined so as to become lower in the traveling direction of the carriage 40, correction is made so that the ejection interval of the color ink is narrowed.

<Color ink jetting process>
Subsequently, the controller 50 executes color ink ejection processing (step S8). The color ink ejection process is a process of ejecting color ink from the ejection head 10 onto the medium 101 based on the color ink ejection data corrected in step S7. As a result, a distortion-free picture appears on the surface of the medium 101 . After the color ink is ejected, the color ink adhered to the medium 101 is irradiated with light to cure the color ink.

As described above, in the present embodiment, since the transparent base ink is used as the test ink, there is almost no difference in color development due to the color ink between the portion to which the test ink is attached and the portion to which the test ink is not attached. Therefore, the medium 101 to which the test ink is attached can be used as it is, and there is no need to discard it.

<Ejection data correction process for coating ink>
Subsequently, the control device 50 executes coating ink ejection data correction processing (step S9). The coating ink ejection data is data previously acquired by the control device 50, and the coating ink is ejected based on the data.

For example, when the coating ink is ejected based on the coating ink ejection data before correction (that is, when the control device 50 acquires the coating ink ejection data), the thickness of the medium 101 is constant if the surface of the medium 101 is flat. A coating layer is formed. On the other hand, if the surface of the medium 101 is uneven, a coating layer with an uneven thickness may be formed. The coating ink ejection data correction process is a process for correcting such coating ink ejection data.

In the coating ink ejection data correction process of the present embodiment, the coating ink ejection data is corrected based on the surface shape of the medium 101 estimated in step S4. Specifically, the ejection data for coating ink is corrected according to the surface shape of the medium 101 so that the thickness of the coating layer is constant over the entire surface of the medium 101 . In this case, for example, in a portion of the medium 101 that is inclined so as to become higher in the traveling direction of the carriage 40, correction is made so that the ejection amount of the coating ink is reduced. Further, for example, correction is made so that the ejection amount of the coating ink increases in a portion that is inclined so as to become lower in the traveling direction of the carriage 40 .

<Coating ink jetting process>
Subsequently, the control device 50 executes coating ink ejection processing (step S10). The coating ink ejection process is a process of ejecting coating ink from the ejection head 10 onto the medium 101 based on the coating ink ejection data corrected in step S9. After the coating ink is ejected, the coating ink adhered to the medium 101 is irradiated with light to cure the coating ink. As a result, a coating layer having a uniform thickness is formed on the surface of the medium 101 with color ink. With this, the ink ejection program ends.

(Modification)
Although the ink ejection device 100 according to the present embodiment has been described above, the ink ejection device 100 is not limited to the configuration described above. For example, in this embodiment, a transparent primer ink was used as the test ink, but a transparent coating ink may be used. Also, a transparent ink other than the primer ink and the coating ink may be used. However, when the primer ink or the coating ink is used, it is not necessary to separately prepare the test ink, so the complication of the ink ejection device 100 can be suppressed.

As described above, the base ink includes white ink. If white ink is used as the base ink, white ink may be used as the test ink. Also in this case, there is almost no difference in color development due to the color ink between the portion to which the test ink is adhered and the portion to which the test ink is not adhered. Furthermore, the same color ink as the medium 101 may be used as the test ink. Similar effects can be obtained in this case as well.

Further, when coating ink is used as the test ink, the second stage correction in the base ink ejection data correction process (step S5), that is, the correction based on the test ink adhesion pattern can be omitted. Alternatively, two stages of correction may be performed in the coating ink ejection data correction process (step S9). Specifically, in the coating ejection data correction process, based on the test ink adhesion pattern acquired in step S3, a correction is added so that the coating ink becomes lighter at the positions on the medium 101 where the test ink is adhered. good too. More specifically, the control device 50 may generate mask data based on the adhesion pattern acquired in step S3, and correct the coating ink ejection data by multiplying the coating ink ejection data by the mask data. . By performing this treatment, the surface of the coating layer can be formed smoothly.

The test ink may also contain a component that fluoresces under ultraviolet light. In this case, when the irradiation device 20 irradiates the test ink with ultraviolet light, the test ink emits light.

Further, in this embodiment, the curing time is adjusted according to the surface roughness of the medium 101, but the size of the test ink droplet to be ejected may be adjusted according to the surface roughness of the medium 101. good. For example, when the surface roughness of the medium 101 is higher than the reference roughness, the droplet size may be made larger than when the surface roughness is lower than the reference roughness. If the droplet of the test ink is large, it spreads easily, and if the droplet is small, it does not spread easily. Therefore, if the above processing is performed, the boundary between the portion where the test ink is adhered and the other portion tends to be conspicuous. As a result, recognition of the test ink is facilitated.

10 ejection head 20 irradiation device 30 imaging device 40 carriage 41 carriage driving device 50 control device 100 ink ejection device 101 medium

Claims (13)

an ejection head that ejects ink onto a medium;
an imaging device that captures an image of the ink adhering to the medium;
a controller;
The control device is
a test ink ejection process for ejecting test ink from the ejection head onto the medium;
an adhesion pattern acquisition process for acquiring an adhesion pattern of the test ink adhered to the medium based on imaging data including the test ink captured by the imaging device;
a surface shape estimation process for estimating the surface shape of the medium based on the acquired adhesion pattern;
color ink ejection data correction processing for correcting previously acquired color ink ejection data according to the estimated surface shape of the medium;
a color ink ejection process for ejecting color ink from the ejection head onto the medium based on the corrected color ink ejection data;
The ink ejection device, wherein the test ink is transparent ink, ink of the same color as the medium, or ink of the same color as the base. 2. The ink jetting apparatus according to claim 1, wherein the test ink is base ink that forms a base before the color ink is jetted. The control device is
When forming the base,
base ink ejection data correction processing for correcting base ink ejection data acquired in advance according to the estimated surface shape of the medium;
3. The ink ejecting apparatus according to claim 2, further comprising a base ink ejection process for ejecting the base ink from the ejection head onto the medium based on the corrected base ink ejection data. In the base ink ejection data correction process, the control device further adjusts the base ink ejection data so that the base ink is not ejected from the ejection head at a position on the medium where the test ink is adhered. 4. The ink ejection device of claim 3, wherein the correction is performed. In the base ink ejection data correction process, the control device generates mask data based on the acquired adhesion pattern, and multiplies the base ink ejection data by the mask data to obtain the base ink ejection data. 5. The ink jetting device according to claim 4, wherein the correction is made for . 2. The ink ejection device according to claim 1, wherein the test ink is coating ink that forms a coating layer after the color ink is ejected. The control device is
When forming the coating layer,
coating ink ejection data correction processing for correcting coating ink ejection data acquired in advance according to the estimated surface shape of the medium;
7. The ink ejection apparatus according to claim 6, further comprising: a coating ink ejection process of ejecting the coating ink from the ejection head onto the medium based on the corrected coating ink ejection data. In the coating ink ejection data correction process, the control device controls the coating layer so that the coating layer is thinner at a position where the test ink is adhered on the medium than at a position where the test ink is not adhered. 8. The ink ejection device according to claim 7, wherein the ejection data for coating ink is further corrected. In the coating ink ejection data correction process, the control device generates mask data based on the acquired adhesion pattern, and multiplies the coating ink ejection data by the mask data. 9. The ink ejection device according to claim 8, which corrects for . further comprising an irradiation device that irradiates the surface of the medium with light from a direction that forms an angle of 0 to 15 degrees with respect to the movement direction of the imaging device;
10. The imaging device according to any one of claims 1 to 9, wherein the imaging device images the test ink adhered to the medium and irradiated by the irradiation device from a direction perpendicular to the moving direction of the imaging device. ink injector. The test ink is a photocurable ink that is cured by light emitted from the irradiation device,
The control device is
when the surface roughness of the medium is higher than the reference roughness, irradiating light from the irradiation device so that the time from ejection of the test ink to curing is shorter than the reference curing time;
Light is emitted from the irradiation device so that the time from ejection of the test ink to curing is longer than the reference curing time when the surface roughness of the medium is lower than the reference roughness. 11. The ink ejection device according to claim 10, which performs irradiation processing. 12. The ink ejection device according to claim 10, wherein said imaging device performs imaging using a CCD sensor. further comprising an irradiation device for irradiating ultraviolet light,
10. The ink ejection device of any one of claims 1-9, wherein the test ink contains a component that fluoresces under ultraviolet light.

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