JP6952243B2 - Printing method and printing equipment - Google Patents

Description

The present disclosure relates to printing methods and printing devices.

Conventionally, an inkjet printing method is known in which a film having a predetermined thickness is printed (formed) on an object by ejecting ink droplets from a plurality of nozzles provided in the inkjet head.

For example, Patent Document 1 discloses an inkjet printing method in which printing is performed while changing the printing pitch in a direction orthogonal to the printing direction in order to evenly print UV ink on a plate-shaped object.

Here, the inkjet printing method of Patent Document 1 will be described with reference to FIG. FIG. 8 is an explanatory diagram of the inkjet printing method of Patent Document 1.

As shown in FIG. 8, in the inkjet printing method of Patent Document 1, an inkjet head 11 in which a plurality of nozzles 19 are arranged in a direction orthogonal to the printing direction (hereinafter, referred to as an orthogonal direction) is used. In FIG. 8, the vertical direction in the figure is an orthogonal direction, and the horizontal direction in the figure is a printing direction.

In the first printing shown in FIG. 8, the droplet 20 is applied to the object 40 so that the printing pitch in the direction orthogonal to the printing pitch in the printing direction becomes wider.

In the second printing shown in FIG. 8, the inkjet head 11 and the object 40 are relatively moved in the orthogonal direction, and the droplet 20 is applied between the first printing patterns on the object 40.

In the third printing shown in FIG. 8, the inkjet head 11 and the object 40 are moved relative to each other in the direction opposite to the second printing, and the first printing pattern and the second printing pattern on the object 40 are displayed. In the meantime, the droplet 20 is applied.

In the fourth printing shown in FIG. 8, the inkjet head 11 and the object 40 are relatively moved in the same direction as the second printing, and between the first printing pattern and the second printing pattern on the object 40. 20 is coated with the droplet 20.

In the fifth printing shown in FIG. 8, the inkjet head 11 and the object 40 are moved relative to each other in the direction opposite to that of the second printing, and a liquid is placed between the second printing pattern and the third printing pattern. Apply drop 20.

As described above, in the inkjet printing method of Patent Document 1, the printing operation is performed a plurality of times so as to fill the gap in the orthogonal direction.

Japanese Unexamined Patent Publication No. 2006-110746

However, in the inkjet printing method of Patent Document 1, since the intervals between the droplets in the orthogonal direction do not interfere with each other widely, the film thickness in the orthogonal direction tends to vary due to the variation in the ejection amount between the nozzles.

An object of one aspect of the present disclosure is to provide a printing method and a printing apparatus that realize uniform film thickness.

In the printing method according to one aspect of the present disclosure, the relative positions of the ink droplet head for ejecting ink droplets and the object are changed in the first direction, and the liquid is based on a plurality of preset target landing positions. In a printing method in which a drop is landed on an object, the first pitch, which is the distance between the target landing positions in the first direction, is between the target landing positions in a second direction orthogonal to the first direction. the distance and the second pitch or more and the droplets or less in diameter, in the droplets of the first direction, that is ejected to the target landing position of every four times the first pitch 4 The operation of landing at all of the target landing positions is performed.

The printing apparatus according to one aspect of the present disclosure changes the relative positions of the inkjet head for ejecting ink droplets, the inkjet head, and an object in the first direction, and a plurality of preset target landing positions. A control unit for landing the droplet on the object based on the above, and a first pitch, which is a distance between the target landing positions in the first direction, is a second direction orthogonal to the first direction. wherein the distance between the target landing position is at a second pitch or more, in the droplets of the first direction is performed four times to be ejected to the target landing position of every four times the first pitch in the Performs an operation to land at all target landing positions.

According to the present disclosure, uniform film thickness can be realized.

Schematic diagram showing the outline of the configuration of the printing apparatus according to the embodiment of the present disclosure. Schematic diagram showing the outline of the configuration of the line head according to the embodiment of the present disclosure. Schematic diagram showing an arrangement example of an inkjet head in the line head according to the embodiment of the present disclosure. Schematic diagram showing a conventional print pattern Schematic diagram showing the process of forming a conventional print pattern Schematic diagram showing the cross-sectional shape of the printing film of the conventional printing pattern Schematic diagram showing the printing pattern of the first embodiment of the present disclosure. Schematic diagram showing a state in the middle of forming a print pattern according to the first embodiment of the present disclosure. Schematic diagram showing the cross-sectional shape of the print film of the print pattern of the first embodiment of the present disclosure. Schematic diagram showing the printing pattern of the second embodiment of the present disclosure. Schematic diagram showing a printing pattern which is a comparative example of the third embodiment of the present disclosure. Top view showing the corners of the printing film obtained by printing the printing pattern shown in FIG. 6A. Cross-sectional view of the printing film shown in FIG. 6B Schematic diagram showing the printing pattern of the third embodiment of the present disclosure. Top view showing the corners of the printing film obtained by printing the printing pattern shown in FIG. 7A. Cross-sectional view of the printing film shown in FIG. 7B Explanatory drawing of inkjet printing method of patent document 1

Hereinafter, each embodiment of the present disclosure will be described with reference to the drawings. The components common to each figure are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

(Embodiment 1)
The first embodiment of the present disclosure will be described.

<Printing device 1>
The basic configuration of the printing apparatus 1 will be described with reference to FIG. FIG. 1 is a schematic view showing an outline of the configuration of the printing apparatus 1 according to the present embodiment.

The printing device 1 shown in FIG. 1 is an inkjet printing device. As shown in FIG. 1, the printing apparatus 1 has a slider 2, a stage 3 moving on the slider 2, a gantry 6 arranged across the slider 2, and a line head 10 attached to the gantry 6.

The printing apparatus 1 ejects ink droplets from the line head 10 according to the position of the stage 3, and applies the droplets to a desired position on the glass substrate 4 (an example of an object) adsorbed on the stage 3. , Form a preset print pattern 5. The print pattern 5 is, for example, a print pattern (see FIGS. 4A, 5 and 7A) formed by the printing methods of the first to third embodiments described later.

<Line head 10>
The configuration of the line head 10 will be described with reference to FIGS. 2A and 2B. FIG. 2A is a schematic view showing an outline of the configuration of the line head 10. FIG. 2B is a schematic view showing an example of arrangement of the inkjet head 11 on the surface of the line head 10 facing the stage 3.

As shown in FIG. 2A, the line head 10 has a plurality of inkjet heads 11, an ink tank 13, a distribution tank 12, and a control circuit 14.

The ink tank 13 is a source of ink for the inkjet head 11.

The distribution tank 12 distributes the ink supplied from the ink tank 13 to each inkjet head 11.

The control circuit 14 (an example of a control unit) controls the operation of each inkjet head 11. Specifically, the control circuit 14 controls the droplet ejection operation of the inkjet head 11 so that the printing patterns of the first to third embodiments of the present disclosure described later can be printed.

As shown in FIG. 2B, each inkjet head 11 has a plurality of nozzles 19.

In the line head 10, the printing resolution in the direction orthogonal to the printing direction (moving direction of the stage 3) is determined by the pitch of the nozzle 19. Therefore, in the line head 10 of the present embodiment, as shown in FIG. 2B, the inkjet head 11 (and the row of nozzles 19) is arranged at an angle with respect to the printing direction to reduce the printing resolution. ..

Each nozzle 19 is filled with ink. At this time, the ink is held in each nozzle 19 by the pressure controlled by the ink tank 13 without leaking from the opening portion (outlet) of the nozzle 19 and without foaming.

The inkjet head 11 has a driving element (not shown). When the control circuit 14 outputs a signal instructing the ejection of droplets to the driving element, the driving element is driven and a desired amount of droplets are ejected from the nozzle 19.

<Conventional printing pattern>
Here, the conventional printing pattern will be described with reference to FIGS. 3A to 3C.

FIG. 3A is a schematic view showing an example of a conventional printing pattern. In the following, the case where the print pattern shown in FIG. 3A is formed on the glass substrate 4 (not shown in FIGS. 3A to 3C) by using the nozzle 19 of the inkjet head 11 shown in FIGS. 2A and 2B is taken as an example. I will explain. Further, in the following description, the direction orthogonal to the printing direction is referred to as "orthogonal direction". The printing direction corresponds to an example of the "first direction", and the orthogonal direction corresponds to an example of the "second direction".

In FIG. 3A, the target landing position 20a is the target position where the droplets ejected from the nozzle 19 land.

In FIG. 3A, the nozzle pitch is the distance between the nozzles 19 in the orthogonal direction, and is the distance between the dotted lines in the vertical direction in the drawing. The nozzle pitch is, for example, 21.2 μm.

Further, in FIG. 3A, the orthogonal pitch is the distance between droplets (which may be rephrased as the target landing position 20a) in the orthogonal direction. In this example, it is assumed that the nozzles 19 are used every other nozzle. Therefore, the orthogonal pitch is 42.4 μm. The orthogonal pitch corresponds to an example of the "second pitch" (the same applies to the second and third embodiments).

Further, in FIG. 3A, the printing direction pitch is the distance between the droplets (which may be rephrased as the target landing position 20a) in the printing direction, and is the distance between the dotted lines in the horizontal direction in the drawing. The printing direction pitch is, for example, 10.6 μm. The print direction pitch corresponds to an example of the "first pitch" (the same applies to the second and third embodiments).

The target landing position 20a, the nozzle pitch, the orthogonal pitch, and the printing direction pitch described above are preset.

The ink used in this example is, for example, a UV resin ink having a contact angle of 10 degrees or less with respect to the glass substrate 4 and a viscosity of about 15 mPa · s. The diameter of one droplet is about 90 μm.

Although only the print patterns corresponding to the five nozzles are shown in FIG. 3A, the print patterns shown in FIG. 3A may be repeatedly formed in a predetermined area of the glass substrate 4.

FIG. 3B is a schematic view showing a state in the process of forming the print pattern shown in FIG. 3A. As shown in FIG. 3B, the droplets 20 are sequentially ejected from every other nozzle 19 to the target landing position 20a in the printing direction, and land on the glass substrate 4. As a result, the droplets 20 are densely arranged on the glass substrate 4 in the printing direction rather than in the orthogonal direction. The dotted oval in the figure indicates the range of the printing film formed by one nozzle 19.

FIG. 3C is a schematic view showing the cross-sectional shape of the printing film. The cross-sectional shape of the printing film formed by one nozzle 19 is a convex shape (mountain shape) as shown by a broken line in the drawing. Then, as shown by the solid line in the drawing, the cross-sectional shape of the entire printing film is a shape in which the convex shapes are overlapped. As shown in FIG. 3A, when the pitch in the orthogonal direction is larger than the pitch in the printing direction, the convex shape of the printing film formed by one nozzle 19 becomes large. Therefore, the unevenness of the cross-sectional shape of the entire printing film becomes large.

Further, each of the plurality of nozzles 19 has a manufacturing error in the shape of the driving element and the opening. Therefore, the amount of droplets ejected from the nozzle 19 (hereinafter referred to as the ejection amount) varies by several percent.

When the print pattern shown in FIG. 3A is formed, the variation in the ejection amount of the nozzle 19 is emphasized. Therefore, the film thickness of the printing film varies. After the droplets 20 coated on the glass substrate 4 were irradiated with UV light and cured, the variation in film thickness in the orthogonal direction was measured. As a result, the film thickness was about 10 μm in the measurement length range of 50 mm, and the difference PV (film thickness variation) between the maximum and the minimum film thickness was 0.45 μm.

<Printing pattern of this embodiment>
The printing pattern of this embodiment will be described with reference to FIGS. 4A to 4C.

FIG. 4A is a schematic view showing an example of the printing pattern of the present embodiment. In the following, the case where the print pattern shown in FIG. 4A is formed on the glass substrate 4 (not shown in FIGS. 4A to 4C) by using the nozzle 19 of the inkjet head 11 shown in FIGS. 2A and 2B is taken as an example. I will explain. The ink used in this example is, for example, a UV resin ink having a contact angle of 10 degrees or less with respect to the glass substrate 4 and a viscosity of about 15 mPa · s.

In the printing pattern shown in FIG. 4A, the nozzle pitch, the orthogonal pitch, and the printing direction pitch are 21.2 μm. That is, the printing direction pitch is equal to the orthogonal direction pitch. Further, the printing direction pitch is made smaller than the diameter of the droplet 20 (for example, about 90 μm).

FIG. 4B is a schematic view showing a state in the process of forming the print pattern shown in FIG. 4A. As shown in FIG. 4B, the droplets 20 are sequentially ejected from each nozzle 19 to the target landing position 20a in the printing direction, and land on the glass substrate 4. The landed droplet 20 is not ejected more densely in the printing direction than the droplet 20 shown in FIG. 3B. Therefore, each droplet 20 is equally wet and spread in all directions, and is combined with another droplet 20 adjacent in the orthogonal direction and another droplet 20 adjacent in the printing direction. The dotted oval in the figure indicates the range of the printing film formed by one nozzle 19 as in FIG. 3B.

FIG. 4C is a schematic view showing the cross-sectional shape of the printing film. The cross-sectional shape of the printing film formed by one nozzle 19 is a convex shape (mountain shape) as shown by a broken line in the drawing. This convex shape is gentler than the convex shape shown in FIG. 3C. This is because the space between the droplets 20 is secured in the printing direction, so that each droplet 20 wets and spreads in the space.

In this example, since the pitch in the orthogonal direction is small, the droplets 20 are likely to be mixed between the nozzles 19, and the variation in the discharge amount of each nozzle 19 is alleviated. Therefore, the entire printed film (solid line portion in the figure) shown in FIG. 4C has no unevenness as compared with the entire printed film shown in FIG. 3C and is smoothed.

After the droplets 20 coated on the glass substrate 4 were irradiated with UV light and cured, the variation in film thickness in the orthogonal direction was measured. As a result, the film thickness was about 10 μm in the measurement length range of 50 mm, and the difference PV (film thickness variation) between the maximum and the minimum film thickness was 0.19 μm. Therefore, the variation in film thickness was smaller than the difference in the conventional printing patterns (0.45 μm) described above.

As described above, in the inkjet head 11, the ejection amount tends to vary among the nozzles 19 due to the manufacturing error of each nozzle 19. Therefore, in the present embodiment, as described above, the printing direction pitch is made equal to the orthogonal direction pitch and smaller than the diameter of the droplet 20. As a result, the droplets 20 are bonded to each other in the orthogonal direction, the variation in the discharge amount between the nozzles 19 is alleviated, and the variation in the film thickness of the printing film is reduced (in other words, the film thickness is made uniform). can.

In the above description, the case where the printing direction pitch is equal to the orthogonal direction pitch and is smaller than the diameter of the droplet 20 has been described as an example, but the present invention is not limited to this. For example, the printing direction pitch may be equal to or greater than the orthogonal pitch and less than or equal to the diameter of the droplet 20. Even in this case, the same effect as described above can be obtained.

In the present embodiment, a case where a UV resin ink having a viscosity of about 15 mPa · s and a film thickness of 10 μm is used has been described as an example, but the present invention is not limited to this. For example, the effectiveness has been confirmed even when the viscosity is 2 to 30 mPa · s and the film thickness of the printing film is in the range of 1 to 20 μm. The thickness variation depends on the wettability of the base substrate and the ink and the ink viscosity, but under the same conditions, the printing pattern of the present embodiment suppresses the film thickness variation as compared with the conventional printing pattern. can do.

(Embodiment 2)
The second embodiment of the present disclosure will be described.

In the present embodiment, as in the first embodiment, the printing direction pitch is set to be equal to or larger than the orthogonal pitch and equal to or smaller than the diameter of the droplet. Further, in the present embodiment, the printing film is formed by performing the operation of randomly ejecting the droplets to the target landing position in the printing direction a plurality of times.

FIG. 5 is a schematic view showing a printing pattern of the present embodiment. In FIG. 5, the target landing positions 20b to e are the target landing positions at the time of the 1st to 4th printing, respectively.

Further, as shown in FIG. 5, the orthogonal pitch is set to 21.2 μm, and the print direction pitch per printing is set to 84.8 μm (four times the print direction pitch shown in FIG. 4A). .. Further, the pitch between the droplets shown in FIG. 5 can be said to be the pitch between the target landing positions adjacent to each other in the printing direction.

The print pattern shown in FIG. 5 has a thinner film thickness than the print pattern formed in the first embodiment. Therefore, in order to secure the film thickness, the position in the printing direction is offset and printing is performed four times. Other printing conditions (for example, the inkjet head and ink used) are the same as those in the first embodiment.

After performing the first printing, the distance between one droplet and the adjacent droplet is shorter in the orthogonal direction than in the printing direction. Therefore, each droplet is mixed with adjacent droplets in the orthogonal direction ejected from different nozzles 19. Therefore, in the printing pattern of the present embodiment, the variation in the ejection amount between the nozzles 19 is alleviated and the variation in the film thickness in the orthogonal direction is reduced as compared with the printing pattern of the first embodiment. However, at the time of the first printing, only one-fourth of the total number of droplets required to form the printing pattern of the first embodiment is ejected, so that the film thickness is the first embodiment. It is about a quarter of the print pattern of.

Therefore, after the first printing is executed, the second to fourth printings are executed. As a result, as shown in FIG. 5, the pitch between the droplets in the printing direction is 21.2 μm. Therefore, it is possible to secure a film thickness equivalent to that of the printing film formed in the first embodiment and to form a printing film having a smaller variation in film thickness.

In the above description, the case where the target landing positions 20b to e correspond to the first to fourth printings, respectively, has been described as an example, but the present invention is not limited to this. For example, the target landing position at the time of the first to fourth printing is the target landing position 20e, the target landing position at the second printing is the target landing position 20d, and the target landing position at the third printing is the target landing position 20c, 4 The target landing position at the time of the second printing may be the target landing position 20b.

Further, in the 2nd to 4th printings, the inkjet head 11 may be moved relative to the glass substrate 4 in the orthogonal direction, and a nozzle 19 different from the first printing may be used. As a result, it is possible to further alleviate the variation in film thickness due to the variation in the discharge amount of the nozzle 19.

The variation in film thickness in the orthogonal direction was measured when the inkjet head 11 was moved by about 3 mm and the 1st to 4th printings were performed. As a result, the film thickness was about 10 μm in the measurement length range of 50 mm, and the difference PV (film thickness variation) between the maximum and the minimum film thickness was 0.12 μm.

Table 1 shows the film thickness variation for each of the above-mentioned print patterns. In Table 1, the print pattern (1) is the conventional print pattern shown in FIG. 3A, and the print pattern (2) is the print pattern of the first embodiment shown in FIG. 4A, and the print pattern (3). Is the printing pattern of the second embodiment shown in FIG. 5A.

As is clear from Table 1, in the printing pattern of the present embodiment, the film thickness variation can be minimized.

(Embodiment 3)
The third embodiment of the present disclosure will be described.

The printing method described in the first and second embodiments is effective for smoothing the printing film in the central portion of the printing pattern. On the other hand, the droplets arranged on the outer peripheral portion (which may be called the end portion) of the printed pattern behave differently from the droplets arranged on the central portion of the printed pattern due to the influence of the interface with the glass substrate 4. Is shown. In the present embodiment, the unevenness of the film thickness on the outer peripheral portion of the print pattern is reduced.

First, problems in the corners, which is an example of the outer peripheral portion of the print pattern, will be described with reference to FIGS. 6A to 6C. In FIGS. 6A and 6B, reference numeral 30 indicates a corner portion.

Here, the case of forming the print pattern shown in FIG. 6A will be taken as an example. FIG. 6A is a schematic view showing a printing pattern which is a comparative example of the present embodiment.

In FIG. 6A, the black circles indicate each droplet that has landed on the glass substrate 4 (not shown) based on a target landing position (not shown). The print pattern shown in FIG. 6A is the same print pattern as that of the first embodiment shown in FIG. 3A.

FIG. 6B shows the upper surface around the corners of the printing film obtained as a result of printing the printing pattern shown in FIG. 6A. When the central portion and the corner portion have the same printing pattern as shown in FIG. 6A, the original printing area is formed in the corner portion 30 as shown in FIG. 6B due to the surface tension and wettability of the ink with respect to the glass substrate 4. A portion where the ink squeezes out from (the dotted line portion shown in FIG. 6B) is generated.

FIG. 6C is a cross-sectional view of the portion shown by the alternate long and short dash line in FIG. 6B. As shown in FIG. 6C, the film thickness of the corner portion 30 is larger than the target (target) film thickness. Therefore, in the printing film, there is a problem that the corner portion 30 has a convex shape.

The printing method of the present embodiment for solving the above-mentioned problems will be described with reference to FIGS. 7A to 7C.

FIG. 7A is a schematic view showing a printing pattern of the present embodiment. As shown in FIG. 7A, in the printing pattern of the present embodiment, a thinning area is provided around the corner portion 30. The thinning area is preset according to the amount of ink squeezed out and the film thickness at the corners 30 of the print pattern.

In the example of FIG. 7A, the printing direction pitch a in the thinning area is set to twice the printing direction pitch c in the central portion, and the orthogonal direction pitch b in the thinning area is set to twice the orthogonal pitch d in the central portion. Has been done. Further, in the example of FIG. 7A, the thinning region is set so as to include a rectangular region e in which droplets are not ejected within a certain range from the corner portion 30.

That is, in the thinning region, the number of target landing positions 20a in the outer peripheral portion per unit area is set to be smaller than the number of target landing positions 20a per unit area in the central portion. As a result, in the thinning region, the droplets are thinned out (in other words, the number of applied droplets is reduced).

In the above description, the case where the print direction pitch and the orthogonal direction pitch are each set to double in the thinning area has been described as an example, but the present invention is not limited to this. For example, the number of nozzles used in the thinning area may be reduced.

FIG. 7B shows the upper surface around the corners of the printing film obtained as a result of printing the printing pattern shown in FIG. 7A. As shown in FIG. 7B, in the corner portion 30, there is no portion where the ink protrudes from the original print area (dotted line portion shown in FIG. 7B).

FIG. 7C is a cross-sectional view of the portion shown by the alternate long and short dash line in FIG. 7B. As shown in FIG. 7C, the film thickness of the corner portion 30 does not become larger than the target (target) film thickness. Therefore, in the printing film, there is no problem that the corner portion 30 has a convex shape.

As described above, according to the printing pattern of the present embodiment, by thinning out the printing pattern (droplets) at the corners, the amount of droplets flowing into the corners can be reduced, and the protrusion of the printing film can be suppressed. , It is possible to form a printing film having less unevenness in film thickness.

The present disclosure is not limited to the description of each of the above embodiments, and various modifications can be made without departing from the spirit of the present invention.

The printing methods and printing devices of the present disclosure are useful for producing functional films used in electronic devices and the like.

1 Printing device 2 Slider 3 Stage 4 Glass substrate 5 Printing pattern 6 Guntry 10 Line head 11 Inkjet head 12 Distribution tank 13 Ink tank 14 Control circuit 19 Nozzle 20 Droplets 20a, 20b, 20c, 20d, 20e Target landing position 30 corners 40 Object

Claims (7)

A printing method in which the relative position between an inkjet head that ejects ink droplets and an object is changed in the first direction, and the droplets are landed on the object based on a plurality of preset target landing positions. There,
The first pitch, which is the distance between the target landing positions in the first direction, is equal to or greater than the second pitch, which is the distance between the target landing positions in the second direction orthogonal to the first direction, and the liquid. Less than or equal to the diameter of the drop
In the first direction the droplets is performed four times to be ejected to the target landing position of every four times the first pitch, performs the operation to land on all the target landing positions,
Printing method. While the four discharges are performed, the inkjet head is moved in the second direction relative to the object.
The printing method according to claim 1. A printing method in which the relative position between an inkjet head that ejects ink droplets and an object is changed in the first direction, and the droplets are landed on the object based on a plurality of preset target landing positions. There,
The first pitch, which is the distance between the target landing positions in the first direction, is equal to or greater than the second pitch, which is the distance between the target landing positions in the second direction orthogonal to the first direction, and the liquid. Less than or equal to the diameter of the drop
A thinning area is provided only at the corners of the object.
The number of target landing positions per unit area in the thinning area is smaller than the number of target landing positions per unit area in the central portion inside the thinning area.
Printing method. The thinned-out area includes an empty area in which the droplet is not ejected, including a corner of the object.
The printing method according to claim 3. The empty area has a rectangular shape and includes a plurality of the target landing positions.
The printing method according to claim 4. The thinning area includes a first thinning area and a second thinning area.
In the first thinning region, the first pitch is wider than the central portion, and the second pitch is the same as the central portion.
In the second thinning region, the second pitch is wider than the central portion, and the first pitch is the same as the central portion.
The printing method according to any one of claims 3 to 5. An inkjet head that ejects ink droplets and
It has a control unit that changes the relative position of the inkjet head and the object in the first direction and causes the droplet to land on the object based on a plurality of preset target landing positions.
The first pitch, which is the distance between the target landing positions in the first direction, is equal to or greater than the second pitch, which is the distance between the target landing positions in the second direction orthogonal to the first direction, and the liquid. Less than or equal to the diameter of the drop
In the first direction the droplets is performed four times to be ejected to the target landing position of every four times the first pitch, performs the operation to land on all the target landing positions,
Printing device.

Images