JP2013094742A - Drawing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem wherein an apparatus cost is high in a liquid drop ejector equipped with a plurality of ultraviolet irradiation apparatuses in association with the enlargement of the ultraviolet irradiation apparatus.SOLUTION: The liquid drop ejector includes an ejection head 33 ejecting an ultraviolet curable liquid toward a recording medium; a head holding member for holding the ejection head; a main scanning direction displacing apparatus for changing the position of a head holding member in an X-direction; an auxiliary scanning direction displacing apparatus for intermittently changing a line in a Y-direction of the recording medium; and the ultraviolet irradiation apparatus 15 irradiating the liquid ejected to the recording medium, with ultraviolet rays. A drawing method for the liquid drop ejector includes ejecting liquid drops such that the curing time of liquid by ultraviolet irradiation when the ultraviolet irradiation apparatus 15 is located at the rear in a first direction of the main scanning direction of the head holding member is longer than the curing time of liquid by ultraviolet irradiation when the ultraviolet irradiation apparatus 15 is located ahead in a second direction of the main scanning direction of the head holding member.

Description

  The present invention relates to a droplet discharge device.

  Liquid droplets that can be applied to a recording medium by discharging a liquid that is cured by irradiation of ultraviolet rays toward the recording medium, and the liquid applied to the recording medium can be cured by irradiation of ultraviolet rays. There is a discharge device. Such a droplet discharge device is, for example, a droplet discharge head that discharges a liquid material as droplets, a head moving unit that moves the droplet discharge head in the main scanning direction, and a recording medium that moves in the sub-scanning direction. A recording medium moving means, an ultraviolet irradiation device for irradiating the liquid with ultraviolet rays, and the like are provided. In such a droplet discharge device, ultraviolet irradiation devices are arranged on both sides of the head unit composed of a plurality of droplet discharge heads in the main scanning direction of the droplet discharge head and on the downstream side of the head unit in the conveyance direction of the recording medium. Is known (for example, see Patent Document 1).

Japanese Patent Laying-Open No. 2005-313445

  However, in the above-described droplet discharge device, a plurality of ultraviolet irradiation devices are arranged on both sides of a head unit composed of a plurality of droplet discharge heads and on the downstream side of the head unit in the conveyance direction of the recording medium. In the case of this configuration, it is necessary to increase the size of the ultraviolet irradiation device as the number of droplet discharge heads is increased in order to increase the drawing ability. For this reason, it becomes difficult to take measures for heat radiation of the ultraviolet irradiation device, and the cost of the ultraviolet irradiation device increases. That is, when a plurality of ultraviolet irradiation devices are mounted as in the above-described droplet discharge device, there is a problem that the device cost increases.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A drawing method according to this application example includes a discharge head that discharges a liquid material having a property of being cured by irradiation of ultraviolet rays toward a recording medium, a head holding member that holds the discharge head, A main scanning direction displacement device that reciprocates a position of the head holding member with respect to the recording medium in a first direction in the main scanning direction and a second direction opposite to the first direction; and the relative to the head holding member. A sub-scanning direction displacement device that intermittently changes the position of the recording medium in a sub-scanning direction that intersects the main scanning direction, and the liquid that is discharged to the recording medium and provided on one side of the head holding member in the main scanning direction. In a drawing method of a droplet discharge device including an ultraviolet irradiation device that irradiates a body with ultraviolet rays, the ultraviolet irradiation device is positioned behind a first direction of the main scanning direction of the head holding member. The curing time of the liquid material due to ultraviolet irradiation is greater than the curing time of the liquid material due to ultraviolet irradiation when the ultraviolet irradiation device is positioned in front of the second direction of the main scanning direction of the head holding member. Is also characterized by discharging long droplets.

When drawing is performed with the droplet discharge device of this application example, when the ultraviolet irradiation device is positioned behind the first direction of the main scanning direction of the head holding member, the ultraviolet irradiation is performed immediately after the droplet discharge. On the other hand, when the ultraviolet irradiation device is positioned in front of the second direction of the main scanning direction of the head holding member, ultraviolet irradiation is not performed within the same scanning.
In this droplet discharge device, when the ultraviolet irradiation device is located behind the first direction in the main scanning direction of the head holding member, the discharged droplet is immediately irradiated with ultraviolet rays, so that the curing time is relatively long. Discharge long droplets. Further, when the ultraviolet irradiation device is located in front of the second direction of the main scanning direction of the head holding member, the time until the discharged droplets are irradiated with ultraviolet rays becomes long, and therefore the curing time is relatively short. A droplet is discharged.
According to the drawing method of this application example, even if the ultraviolet irradiation device is one ultraviolet irradiation device for the head holding member, the liquid applied to the recording medium can be sufficiently cured by the ejection head. The cost of the droplet discharge device can be reduced.

  Application Example 2 In the drawing method according to the application example described above, when the ultraviolet irradiation device is positioned behind the first direction of the main scanning direction of the head holding member, the amount of liquid droplets discharged is the ultraviolet light. It is characterized by being larger than the amount of liquid droplets to be ejected when the irradiation device is positioned in front of the second direction of the main scanning direction of the head holding member.

  According to this application example, the liquid droplets that are ejected when the ultraviolet irradiation device is located behind the first direction of the main holding direction of the head holding member are discharged in the second direction of the main holding direction of the head holding member. By making it larger than the amount of liquid droplets ejected when positioned in the front, it is possible to irradiate ultraviolet rays immediately after droplet ejection to droplets that require time for curing, and apply them to the recording medium with the ejection head. It is possible to sufficiently cure the liquid.

  Application Example 3 In the drawing method according to the application example described above, the head holding member moves in the main scanning direction when the ultraviolet irradiation device is located behind the head holding member in the first main scanning direction. The speed is lower than the moving speed of the head holding member in the main scanning direction when the ultraviolet irradiation device is positioned in front of the head holding member in the second direction of the main scanning direction.

  According to this application example, since the ultraviolet irradiation device is only on one side of the head holding member in the main scanning direction, the ultraviolet irradiation is performed after the droplet is discharged in the first direction and the second direction of the head holding member in the main scanning direction. The difference in time until becomes larger. By making the moving speed of the head holding member in the first direction in the main scanning direction slower than the moving speed in the second direction, the ejection heads in the first direction and the second direction of the head holding member in the main scanning direction The difference in time during which ultraviolet rays are irradiated to the droplets ejected from the liquid crystal can be reduced, whereby the liquid applied to the recording medium by the ejection head can be sufficiently cured.

  Application Example 4 A drawing method according to this application example includes a discharge head that discharges a liquid material having a property of being cured by irradiation of ultraviolet rays toward a recording medium, a head holding member that holds the discharge head, A main scanning direction displacement device that reciprocates a position of the head holding member with respect to the recording medium in a first direction in the main scanning direction and a second direction opposite to the first direction; and the relative to the head holding member. A sub-scanning direction displacement device that intermittently changes the position of the recording medium in a sub-scanning direction intersecting the main scanning direction; and a first side surface of two side surfaces of the head holding member in the main scanning direction; A first ultraviolet irradiation device for irradiating the liquid material discharged to the recording medium with ultraviolet rays; and a second side surface opposite to the first side surface in the main scanning direction of the head holding member. On the medium In the drawing method of the droplet discharge device, the first ultraviolet ray is provided with a second ultraviolet ray irradiating device that irradiates the discharged liquid with ultraviolet rays and has a lower ultraviolet illuminance than the first ultraviolet ray irradiating device. When the irradiation device is located behind the first direction of the main scanning direction of the head holding member, the second ultraviolet irradiation device is located behind the second direction of the main scanning direction of the head holding member. When positioned, droplets longer than the curing time of the liquid material by ultraviolet irradiation are discharged.

When drawing is performed with the droplet discharge device of this application example, a droplet with a long time required for the droplet discharged from the discharge head to be solidified by ultraviolet irradiation is retained by the first ultraviolet irradiation device with high ultraviolet illuminance. A droplet that is ejected when positioned behind the first direction of the main scanning direction of the member and takes a short time for the droplet ejected from the ejection head to solidify by ultraviolet irradiation is a second ultraviolet ray having a low ultraviolet illuminance. The ejection is performed when the irradiation device is located behind the second direction of the main scanning direction of the head holding member.
According to the drawing method of this application example, even when the illuminance of one ultraviolet irradiation device among the ultraviolet irradiation devices attached to the two side surfaces of the head holding member in the main scanning direction is lowered, the discharge head applies the recording medium to the recording medium. Since the applied liquid material can be sufficiently cured, the cost of the droplet discharge device can be reduced.

  Application Example 5 In the drawing method according to the application example described above, the amount of liquid droplets to be ejected when the first ultraviolet irradiation device is located behind the head holding member in the first direction of the main scanning direction is The second ultraviolet irradiation device is larger than the amount of liquid droplets ejected when the head holding member is located behind the second direction of the main scanning direction.

  According to this application example, liquid droplets that are ejected when the first ultraviolet irradiation device is located behind the first direction of the main scanning direction of the head holding member have an illuminance higher than that of the first ultraviolet irradiation device. By making the smaller second ultraviolet irradiation device larger than the amount of liquid droplets to be ejected when the head holding member is located behind the second direction in the main scanning direction, it is possible to prevent the time-consuming curing droplets. Can irradiate ultraviolet rays with high illuminance immediately after droplet ejection, and can irradiate ultraviolet rays with low illuminance on droplets that do not require much time for curing, and is applied to the recording medium by the ejection head It is possible to sufficiently cure the liquid.

  Application Example 6 In the drawing method according to the application example described above, the head holding member when the first ultraviolet irradiation device is positioned behind the head holding member in the first direction of the main scanning direction. The moving speed in the main scanning direction is slower than the moving speed in the main scanning direction of the head holding member when the second ultraviolet irradiation device is positioned behind the second direction of the main scanning direction of the head holding member. It is characterized by doing.

  According to this application example, the first ultraviolet irradiation device moves in the first direction by making the moving speed in the first direction slower than the moving speed in the second direction in the main scanning direction of the head holding member. It takes a long time to irradiate the droplets ejected from the ejection head with sufficient ultraviolet rays, which makes it possible to sufficiently cure the liquid applied to the recording medium by the ejection head. Become.

1 is a perspective view illustrating a schematic configuration of a droplet discharge device according to a first embodiment. The front view when the carriage in 1st Embodiment is seen in A view direction in FIG. FIG. 3 is a bottom view of the ejection head in the first embodiment. Sectional drawing in the BB line in FIG. 1 is a block diagram illustrating a schematic configuration of a droplet discharge device according to a first embodiment. FIG. 3 is an explanatory diagram illustrating a drawing operation of the droplet discharge device according to the first embodiment when viewed in the A viewing direction in FIG. 1. 6 is a flowchart showing a flow of a drawing process in the first embodiment. The front view when the carriage in 2nd Embodiment is seen in A view direction in FIG. Explanatory drawing which shows the drawing operation | movement of the droplet discharge apparatus in 2nd Embodiment seeing to A view direction in FIG.

Embodiments will be described with reference to the drawings, taking as an example a droplet discharge device which is one of the recording devices. FIG. 1 is a perspective view illustrating a schematic configuration of a droplet discharge device according to the first embodiment. FIG. 2 is a front view of the carriage according to the first embodiment when viewed in the A viewing direction in FIG. FIG. 3 is a bottom view of the ejection head in the first embodiment. 4 is a cross-sectional view taken along the line BB in FIG. FIG. 5 is a block diagram showing a schematic configuration of the droplet discharge device in the first embodiment.
In addition, in each drawing, in order to make each structure the size which can be recognized, the structure and the scale of a member may differ.

(First embodiment)
As shown in FIG. 1, which is a perspective view showing a schematic configuration, a droplet discharge device 1 in the present embodiment includes a work transfer device 3 as a sub-scanning direction displacement device, a carriage 7 as a head holding member, A carriage conveyance device 11 as a scanning direction displacement device.
The carriage 7 is provided with a head unit 13 and one ultraviolet irradiation device 15.
In the droplet discharge device 1, the liquid W is discharged as droplets from the head unit 13 while changing the relative position in plan view between the head unit 13 and the workpiece W as a recording medium such as a substrate. In addition, a desired pattern can be drawn with a liquid material. In the figure, the Y direction indicates the moving direction of the workpiece W, and the X direction indicates a direction orthogonal to the Y direction in plan view. A direction orthogonal to the XY plane defined by the X direction and the Y direction is defined as the Z direction.

Such a droplet discharge device 1 can be applied to drawing on a recording medium, such as a resin film, into which a liquid does not easily penetrate.
The droplet discharge device 1 can also be applied to, for example, the manufacture of a color filter used for a liquid crystal display panel or the like, or the manufacture of an organic EL (Electro Luminescence) device.
In the case of a color filter having three color filter elements of red, green, and blue, the droplet discharge device 1 can be suitably used, for example, in a process of forming red, green, and blue colored layers on a substrate. In this case, each liquid material corresponding to each colored layer is ejected from the head unit 13 as droplets onto the work W, whereby the patterns of the red, green, and blue filter elements are drawn on the work W.
Further, in the manufacture of an organic EL device, for example, it can be suitably used in a step of forming a functional layer (organic layer) corresponding to each color for each of red, green and blue pixels. In this case, each liquid material corresponding to the functional layer of each color is ejected from the head unit 13 as droplets onto the work W, whereby the patterns of the red, green, and blue functional layers are drawn on the work W.

Here, the details of each component of the droplet discharge device 1 will be described.
As illustrated in FIG. 1, the work transfer device 3 includes a surface plate 21, a guide rail 23 a, a guide rail 23 b, and a work table 25.
The surface plate 21 is made of a material having a small coefficient of thermal expansion, such as stone, and is placed so as to extend along the Y direction. The guide rail 23 a and the guide rail 23 b are disposed on the upper surface 21 a of the surface plate 21. Each of the guide rail 23a and the guide rail 23b extends along the Y direction. The guide rail 23a and the guide rail 23b are arranged in a state where there is a gap in the X direction.

The work table 25 is provided in a state facing the upper surface 21a of the surface plate 21 with the guide rail 23a and the guide rail 23b interposed therebetween. The work table 25 is placed on the guide rail 23a and the guide rail 23b in a state of floating from the surface plate 21. The work table 25 has a placement surface 25a that is a surface on which the workpiece W is placed. The placement surface 25a is directed to the side (upper side) opposite to the surface plate 21 side. The work table 25 is guided along the Y direction by the guide rail 23a and the guide rail 23b, and is configured to be able to reciprocate on the surface plate 21 along the Y direction.
The work table 25 is configured to reciprocate in the Y direction by a moving mechanism and a power source (not shown). As the moving mechanism, for example, a mechanism using a ball screw or a linear guide may be employed. In the present embodiment, a work conveyance motor (not shown) is employed as a power source for moving the work table 25 along the Y direction. As the work transfer motor, various motors such as a stepping motor, a servo motor, and a linear motor can be adopted.
The power from the work transport motor is transmitted to the work table 25 through the moving mechanism. Thereby, the work table 25 can reciprocate along the guide rail 23a and the guide rail 23b, that is, along the Y direction. That is, the workpiece transfer device 3 can reciprocate the workpiece W placed on the placement surface 25a of the workpiece table 25 along the Y direction. In the following, the direction of the Y (−) side is the upstream side of the head unit 13, and the direction of the Y (+) side is the downstream side of the head unit 13.

The head unit 13 includes a head plate 31 and an ejection head 33 as shown in FIG. 2 which is a front view when the carriage 7 is viewed in the direction A in FIG.
As shown in FIG. 3 which is a bottom view, the discharge head 33 has a nozzle surface 35. A plurality of nozzles 37 are formed on the nozzle surface 35. In FIG. 3, the nozzles 37 are exaggerated and the number of the nozzles 37 is reduced in order to easily show the nozzles 37.
In the ejection head 33, the plurality of nozzles 37 constitute four nozzle rows 39 arranged along the Y direction. The four nozzle rows 39 are arranged in a state where there is a gap in the X direction. In each nozzle row 39, the plurality of nozzles 37 are formed at a predetermined nozzle interval P along the Y direction.
Hereinafter, when each of the four nozzle rows 39 is identified, the notation of the nozzle row 39a, the nozzle row 39b, the nozzle row 39c, and the nozzle row 39d is used.
In the ejection head 33, the nozzle row 39a and the nozzle row 39b are shifted from each other by a distance of P / 2 in the Y direction. The nozzle row 39c and the nozzle row 39d are also shifted from each other by a distance of P / 2 in the Y direction.

  The carriage 7 includes a head unit 13 and an ultraviolet irradiation device 15 attached to one side of the head unit in the scanning direction (X direction). In addition, the ultraviolet irradiation device 15 has a light source 43 that emits ultraviolet light 41. The ultraviolet light 41 from the light source 43 promotes curing of the liquid 53 (see FIG. 4) ejected from the ejection head 33. When the liquid 53 is irradiated with the ultraviolet light 41, curing is accelerated.

The ejection head 33 includes a nozzle plate 46, a cavity plate 47, a diaphragm 48, and a plurality of piezoelectric elements 49, as shown in FIG. 4 which is a cross-sectional view taken along the line BB in FIG. doing.
The nozzle plate 46 has a nozzle surface 35. The plurality of nozzles 37 are provided on the nozzle plate 46.
The cavity plate 47 is provided on the surface opposite to the nozzle surface 35 of the nozzle plate 46. A plurality of cavities 51 are formed in the cavity plate 47. Each cavity 51 is provided corresponding to each nozzle 37 and communicates with each corresponding nozzle 37. A liquid 53 is supplied to each cavity 51 from a tank (not shown).

The diaphragm 48 is provided on the surface of the cavity plate 47 opposite to the nozzle plate 46 side. The vibration plate 48 vibrates in the Z direction (longitudinal vibration), thereby enlarging or reducing the volume in the cavity 51.
The plurality of piezoelectric elements 49 are respectively provided on the surface of the diaphragm 48 opposite to the cavity plate 47 side. Each piezoelectric element 49 is provided corresponding to each cavity 51 and faces each cavity 51 with the diaphragm 48 interposed therebetween. Each piezoelectric element 49 expands based on the drive signal. Thereby, the diaphragm 48 reduces the volume in the cavity 51. At this time, pressure is applied to the liquid 53 in the cavity 51. As a result, the liquid 53 is discharged as the droplet 55 from the nozzle 37. The method of discharging the droplet 55 by the discharge head 33 is one of ink jet methods. The ink jet method is one of coating methods.

As shown in FIG. 2, the ejection head 33 having the above configuration is supported by the head plate 31 with the nozzle surface 35 protruding from the head plate 31.
As shown in FIG. 2, the carriage 7 supports the head unit 13. Here, the head unit 13 is supported by the carriage 7 with the nozzle surface 35 facing downward in the Z direction.
As described above, the liquid 53 can be applied to the workpiece W from the ejection head 33.
In this embodiment, the longitudinal vibration type piezoelectric element 49 is employed, but the pressurizing means for applying pressure to the liquid 53 is not limited to this, and for example, the lower electrode and the piezoelectric layer A flexural deformation type piezoelectric element in which an electrode and an upper electrode are laminated may be employed. Further, as the pressurizing means, a so-called electrostatic actuator that generates static electricity between the diaphragm and the electrode, deforms the diaphragm by electrostatic force, and ejects droplets from the nozzles can be employed. Furthermore, the structure which generates a bubble in a nozzle using a heat generating body, and gives a pressure to a liquid material by the bubble may be employ | adopted.

In the present embodiment, a liquid 53 that is cured by being irradiated with light is used as the liquid 53. In the present embodiment, ultraviolet light 41 is employed as light that promotes curing of the liquid material 53.
The liquid 53 includes a resin material, a photopolymerization initiator, and a solvent as components. By adding functional materials such as pigments and dyes such as pigments and surface modifying materials such as lyophilic and liquid repellent properties to these components, a liquid 53 having a specific function can be generated. . The liquid 53 containing a pigment such as a pigment or a dye can be employed as the liquid 53 for forming an image to be drawn on the workpiece W, for example. Hereinafter, the liquid 53 for forming an image to be drawn on the workpiece W is referred to as image paint.

Further, by adopting a light-transmitting resin material such as an acrylic resin material as the resin material as a component of the liquid 53, the light-transmitting liquid 53 can be configured. Such a light-transmitting liquid 53 can be used as a clear ink, for example. Hereinafter, the light-transmitting liquid 53 is referred to as a light-transmitting paint.
As the use of the clear ink, for example, a use as an overcoat layer for covering an image, a use as a base layer before forming an image, and the like can be considered. Hereinafter, the liquid 53 applied as a base layer is referred to as a base paint.
As the base paint, not only the light-transmitting paint but also a liquid 53 obtained by adding various pigments to the light-transmitting paint can be used. For example, a liquid 53 exhibiting white color, a liquid 53 exhibiting metallic luster (metallic), and the like can also be employed as the base paint.

The resin material in the liquid 53 is a material for forming a resin film. Such a resin material is not particularly limited as long as it is a liquid material at room temperature and becomes a polymer by being polymerized. The resin material preferably has a low viscosity, and is preferably in the form of an oligomer. Furthermore, the resin material is more preferably in the form of a monomer.
The photopolymerization initiator is an additive that acts on the crosslinkable group of the polymer to advance the crosslinking reaction. As the photopolymerization initiator, for example, benzyldimethyl ketal can be employed. In this embodiment, a radical photopolymerization initiator is employed as the photopolymerization initiator. As the radical type photopolymerization initiator, for example, Irgacure 819 manufactured by Ciba Japan Co., Ltd. may be employed.
The solvent is for adjusting the viscosity of the resin material.

As shown in FIG. 1, the carriage transport device 11 includes a gantry 101 and a guide rail 103.
The gantry 101 extends in the X direction and straddles the workpiece transfer device 3 in the X direction. The gantry 101 faces the work transfer device 3 on the side opposite to the surface plate 21 side of the work table 25. The gantry 101 is supported by a pair of support columns 107. The pair of support columns 107 are provided at positions facing each other in the X direction with the surface plate 21 interposed therebetween.
In the following, when identifying each of the pair of columns 107, the notation of columns 107a and columns 107b is used. The support column 107a and the support column 107b protrude above the work table 25 in the Z direction. Thereby, a gap is maintained between the gantry 101 and the work table 25.

The guide rail 103 is provided on the surface plate 21 side of the gantry 101. The guide rail 103 extends along the X direction and is provided across the width of the gantry 101 in the X direction.
The carriage 7 described above is supported by the guide rail 103. In a state where the carriage 7 is supported by the guide rail 103, the nozzle surface 35 of the ejection head 33 faces the work table 25 in the Z direction. The carriage 7 is guided along the X direction by the guide rail 103 and is supported by the guide rail 103 so as to be capable of reciprocating in the X direction. In a plan view, in a state where the carriage 7 overlaps the work table 25, the nozzle surface 35 and the mounting surface 25a of the work table 25 face each other with a gap therebetween.

The carriage 7 is configured to reciprocate in the X direction by a moving mechanism and a power source (not shown). As the moving mechanism, for example, a mechanism using a ball screw or a linear guide may be employed. In the present embodiment, a carriage transport motor (not shown) is employed as a power source for moving the carriage 7 along the X direction. As the carriage conveyance motor, various motors such as a stepping motor, a servo motor, and a linear motor can be employed.
The power from the carriage transport motor is transmitted to the carriage 7 through the moving mechanism. Thus, the carriage 7 can reciprocate along the guide rail 103, that is, along the X direction. That is, the carriage conveyance device 11 can reciprocate the head unit 13 supported by the carriage 7 along the X direction. In the following description, movement in the X (+) side direction is referred to as forward movement, and movement in the X (−) side direction is referred to as backward movement.
In the droplet discharge device 1 having the above-described configuration, the droplet 55 is discharged from the discharge head 33 while the discharge head 33 and the workpiece W are relatively reciprocated while the discharge head 33 is opposed to the workpiece W. By doing so, the pattern is drawn on the workpiece W.

As shown in FIG. 5, the droplet discharge device 1 includes a control unit 111 that controls the operation of each of the above-described configurations. The control unit 111 includes a CPU (Central Processing Unit) 113, a drive control unit 115, and a memory unit 117. The drive control unit 115 and the memory unit 117 are connected to the CPU 113 via the bus 119.
The droplet discharge device 1 includes a carriage transport motor 121, a work transport motor 123, an input device 129, and a display device 131.
The carriage transport motor 121 and the work transport motor 123 are connected to the control unit 111 via the input / output interface 133 and the bus 119, respectively. The input device 129 and the display device 131 are also connected to the control unit 111 via the input / output interface 133 and the bus 119, respectively.

The carriage transport motor 121 generates power for driving the carriage 7. The work conveyance motor 123 generates power for driving the work table 25.
The input device 129 is a device for inputting various processing conditions. The display device 131 is a device that displays processing conditions and work status. An operator who operates the droplet discharge device 1 can input various information via the input device 129 while confirming information displayed on the display device 131.
The ejection head 33 and the ultraviolet irradiation device 15 are connected to the control unit 111 via an input / output interface 133 and a bus 119, respectively.

The CPU 113 performs various arithmetic processes as a processor. The drive control unit 115 controls driving of each component. The memory unit 117 includes a RAM (Random Access Memory), a ROM (Read Only Memory) (Read Only Memory), and the like. In the memory unit 117, an area for storing the program software 135 in which the operation control procedure in the droplet discharge device 1 is described, a data development unit 137 that is an area for temporarily developing various data, and the like are set. Yes. Examples of data developed in the data development unit 137 include drawing data indicating a pattern to be drawn, program data such as drawing processing, and the like.
The drive control unit 115 includes a motor control unit 141, a discharge control unit 145, an irradiation control unit 147, and a display control unit 151.

The motor control unit 141 individually controls the drive of the carriage transport motor 121 and the drive of the work transport motor 123 based on a command from the CPU 113.
The discharge controller 145 controls the driving of the discharge head 33 based on a command from the CPU 113.
The irradiation control unit 147 controls the light emission state of the light source 43 in the ultraviolet irradiation device 15 based on a command from the CPU 113.
The display control unit 151 controls driving of the display device 131 based on a command from the CPU 113.

As illustrated in FIG. 6A, the ultraviolet irradiation device 15 is provided so as to be positioned behind the head unit 13 when the head unit 13 moves in the forward direction (X (+) direction).
The ultraviolet irradiation device 15 has a light source 43 that emits ultraviolet light 41. The ultraviolet light 41 from the light source 43 promotes curing of the liquid 53 discharged from the discharge head 33. When the liquid 53 is irradiated with the ultraviolet light 41, curing is accelerated.
As the light source 43, various light sources 43, such as LED, LD, a mercury lamp, a metal halide lamp, a xenon lamp, an excimer lamp, can be employ | adopted, for example.
In the present embodiment, the length of the light source 43 in the Y direction is at least as long as the intermittent sub-scan feed amount of the work W on the downstream side of the head unit 13 from the nozzle row 39 of the ejection head 33, that is, on the Y (+) side. It is set to be long. For this reason, when the head unit 13 moves in the backward direction (X (−) direction), the liquid 53 discharged from the discharge head 33 moves in the forward direction of the head unit 13 after sub-scanning of the workpiece W. Simultaneously with the ejection from the ejection head 33, the ultraviolet light 41 is irradiated from the ultraviolet irradiation device 15. As a result, the liquid 53 discharged from the discharge head 33 can be sufficiently cured when the head unit 13 moves in the forward path and the return path.

Here, a drawing method in the droplet discharge device 1 will be described with reference to the drawings.
FIG. 6 is an explanatory diagram showing the drawing operation of the droplet discharge device 1 in the first embodiment when viewed in the direction of A in FIG. FIG. 7 is a flowchart showing the flow of the drawing process in the first embodiment.
First, the drawing process in the droplet discharge device 1 will be described.
5, in the droplet discharge device 1, when the control unit 111 receives drawing data from the input device 129 via the input / output interface 133 and the bus 119, the CPU 113 starts the drawing process shown in FIG.
Here, the drawing data indicates a pattern to be drawn on the work W by the liquid 53, and the pattern to be drawn is expressed in a bitmap form. The pattern is drawn on the workpiece W while the ejection head 33 is opposed to the workpiece W, while the ejection head 33 and the workpiece W are relatively reciprocated, the droplet 55 is ejected from the ejection head 33 at a predetermined cycle. Is done by letting

In the drawing process, the CPU 113 first outputs a carriage conveyance command to the motor control unit 141 in step S1. At this time, the motor control unit 141 controls the drive of the carriage transport motor 121 to move the carriage 7 to the forward path start position.
Here, in the droplet discharge device 1, a drawing area is set. The drawing area is an area where the locus drawn along the Y direction by the work table 25 shown in FIG. 1 and the locus drawn along the X direction by the ejection head 33 overlap.
The forward path start position is a position at which the forward path starts when the carriage 7 is reciprocated along the X direction. In the present embodiment, the forward path start position is located outside the drawing area in plan view. In the present embodiment, the forward path start position is located on the column 107a side of the drawing area in plan view.

  Next, in step S2, the CPU 113 outputs a workpiece conveyance command to the motor control unit 141 (FIG. 5). At this time, the motor control unit 141 controls the drive of the work transport motor 123 to move the work W to the drawing area.

Next, in step S3, the CPU 113 outputs a carriage scanning command to the motor control unit 141 (FIG. 5). At this time, the motor control unit 141 controls the drive of the carriage transport motor 121 to start the reciprocation of the carriage 7.
Here, in the reciprocating movement of the carriage 7, the carriage 7 reciprocates between the forward path start position and the backward path start position described above. That is, the path that returns from the forward path start position to the forward path start position and returns to the forward path start position is one round trip of the carriage 7. For this reason, in this embodiment, the path from the forward path start position to the return path start position is the forward path of the carriage 7. On the other hand, the path from the return path start position to the forward path start position is the return path of the carriage 7.
The return path start position is a position facing the forward path start position across the drawing area in the X direction. The return path start position is located outside the drawing area in plan view. For this reason, the forward path start position and the backward path start position are opposed to each other across the drawing area in the X direction in plan view. In the present embodiment, the return path start position is located on the column 107b side of the drawing area in plan view.

Next, in step S4, the CPU 113 outputs an irradiation command for the ultraviolet irradiation device 15 to the irradiation control unit 147 (FIG. 5). At this time, the irradiation control unit 147 controls the driving of the light source 43 of the ultraviolet irradiation device 15 to turn on the light source 43 of the ultraviolet irradiation device 15.
Next, in step S5, the CPU 113 determines whether or not the position of the ejection head 33 has reached the drawing start position in the forward path.
Here, the drawing start position is a position where the discharge of the droplet 55 from the discharge head 33 is started in the drawing area.
At this time, if it is determined that the position of the ejection head 33 has reached the drawing start position (Yes), the process proceeds to step S6. On the other hand, if it is determined that the position of the ejection head 33 has not reached the drawing start position (No), the process waits until the position of the ejection head 33 reaches the drawing start position.

  Next, in step S6, the CPU 113 outputs a discharge command to the discharge control unit 145 (FIG. 5). At this time, the discharge controller 145 controls the drive of the discharge head 33 and discharges the droplet 55 from each nozzle 37 based on the drawing data. Thereby, drawing in the forward path is started.

Next, in step S7, the CPU 113 determines whether or not the position of the ejection head 33 has reached the drawing stop position in the forward path.
Here, the drawing stop position is a position where the discharge of the droplet 55 from the discharge head 33 is stopped in the drawing area.
At this time, if it is determined that the position of the ejection head 33 has reached the drawing stop position (Yes), the process proceeds to step S8. On the other hand, if it is determined that the position of the ejection head 33 has not reached the drawing stop position (No), the process waits until the position of the ejection head 33 reaches the drawing stop position.

Next, in step S8, the CPU 113 outputs a discharge stop command to the discharge control unit 145 (FIG. 5). At this time, the ejection control unit 145 stops driving the ejection head 33 and stops ejection of the droplet 55 from each nozzle 37. Thereby, the drawing in the forward path is completed.
Next, in step S9, the CPU 113 outputs an irradiation stop command for the ultraviolet irradiation device 15 to the irradiation control unit 147 (FIG. 5). At this time, the irradiation control unit 147 controls driving of the light source 43 of the ultraviolet irradiation device 15 to turn off the light source 43 of the ultraviolet irradiation device 15.

  Next, in step S10, the CPU 113 determines whether or not the position of the carriage 7 has reached the return path start position. At this time, if it is determined that the position of the carriage 7 has reached the return path start position (Yes), the process proceeds to step S11. On the other hand, if it is determined that the position of the carriage 7 has not reached the return path start position (No), the process waits until the position of the carriage 7 reaches the return path start position.

  Next, in step S11, the CPU 113 outputs a line feed command to the motor control unit 141 (FIG. 5). At this time, the motor control unit 141 that has received the line feed command controls the drive of the work transfer motor 123 to move the work W to the Y (+) side (new line), and to draw a new pattern on the work W. Move the area to the drawing area.

In step S12, the CPU 113 determines whether or not drawing data has been completed. At this time, if it is determined that the drawing data has been completed (Yes), the process proceeds to step S20. On the other hand, if it is determined that the drawing data has not ended (No), the process proceeds to step S13.
In step S13, the CPU 113 determines whether or not the position of the ejection head 33 has reached the drawing start position on the return path. At this time, if it is determined that the position of the ejection head 33 has reached the drawing start position (Yes), the process proceeds to step S14. On the other hand, if it is determined that the position of the ejection head 33 has not reached the drawing start position (No), the process waits until the position of the ejection head 33 reaches the drawing start position.

   Next, in step S14, the CPU 113 outputs a discharge command to the discharge control unit 145 (FIG. 5). At this time, the discharge controller 145 controls the drive of the discharge head 33 and discharges the droplet 55 from each nozzle 37 based on the drawing data. Thereby, drawing on the return path is started.

  Next, in step S15, the CPU 113 determines whether or not the position of the ejection head 33 has reached the drawing stop position on the return path. At this time, if it is determined that the position of the ejection head 33 has reached the drawing stop position (Yes), the process proceeds to step S16. On the other hand, if it is determined that the position of the ejection head 33 has not reached the drawing stop position (No), the process waits until the position of the ejection head 33 reaches the drawing stop position.

  Next, in step S16, the CPU 113 outputs a discharge stop command to the discharge control unit 145 (FIG. 5). At this time, the ejection control unit 145 stops driving the ejection head 33 and stops ejection of the droplet 55 from each nozzle 37. Thereby, drawing on the return path is completed.

  Next, in step S17, the CPU 113 determines whether or not the position of the carriage 7 has reached the return path start position. At this time, if it is determined that the position of the carriage 7 has reached the return path start position (Yes), the process proceeds to step S18. On the other hand, if it is determined that the position of the carriage 7 has not reached the return path start position (No), the process waits until the position of the carriage 7 reaches the return path start position.

  Next, in step S18, the CPU 113 outputs a line feed command to the motor control unit 141 (FIG. 5). At this time, the motor control unit 141 that has received the line feed command controls the drive of the work transfer motor 123 to move the work W to the Y (+) side (new line), and to draw a new pattern on the work W. Move the area to the drawing area.

  Next, in step S19, the CPU 113 determines whether or not the drawing data has been completed. At this time, if it is determined that the drawing data has been completed (Yes), the process proceeds to step S20. On the other hand, if it is determined that the drawing data has not ended (No), the process proceeds to step S4.

  Next, in step S20, the CPU 113 outputs a carriage scanning stop command to the motor control unit 141 (FIG. 5), and ends the process. At this time, the motor control unit 141 that has received the carriage scanning stop command controls the drive of the carriage transport motor 121 to stop the reciprocating movement of the carriage 7.

  In this embodiment, the workpiece W corresponds to the recording medium, the carriage 7 corresponds to the head holding member, the X direction corresponds to the main scanning direction, the carriage transport device 11 corresponds to the main scanning direction displacement device, and the Y direction. Corresponds to the sub-scanning direction, the workpiece transfer device 3 corresponds to the sub-scanning direction displacement device, and each of the ultraviolet light 41 and the ultraviolet light 44 corresponds to ultraviolet rays.

  In the drawing method of the present invention, it is important to select the type of liquid material or the mode of liquid droplets to be ejected as droplets when the head unit 13 moves in the forward direction and when it moves in the backward direction. It has become. That is, as shown in FIG. 6A, when the head unit 13 moves in the forward direction, the ultraviolet irradiation device 15 is positioned rearward with respect to the traveling direction of the head unit 13. Therefore, the ultraviolet light 41 can be irradiated from the ultraviolet irradiation device 15 immediately after the liquid droplet 55a discharged from the discharge head 33 has landed on the workpiece W. For this reason, when the head unit 13 moves in the forward direction, it is possible to effectively cure the liquid that is hard to cure by discharging a liquid or liquid that has a relatively long curing time (hard to cure) or droplets. it can.

On the other hand, as shown in FIG. 6B, when the head unit 13 moves in the backward direction, the ultraviolet irradiation device 15 is positioned forward with respect to the traveling direction of the head unit 13. For this reason, the ultraviolet light 41 cannot be immediately irradiated from the ultraviolet irradiation device 15 to the droplet 55b discharged from the discharge head 33 and landed on the workpiece W. For this reason, when the head unit 13 moves in the backward direction, the liquid can be effectively cured by discharging a liquid that is harder than the liquid discharged when moving in the forward direction.
Note that the liquid material having a long curing time (hard to cure) includes, for example, a liquid material having a large droplet amount, such as the droplet 55a in FIG. 6A with respect to the droplet 55b illustrated in FIG. 6B.

  In the droplet discharge device 1 used in the drawing method of the present embodiment, one ultraviolet irradiation device 15 is installed behind the head unit 13 in the forward movement direction (see FIGS. 2 and 6). For this reason, when the head unit 13 moves forward, the ultraviolet light 41 can be irradiated by the ultraviolet irradiation device 15 immediately after the liquid discharged from the discharge head 33 is discharged. Further, when the head unit 13 moves in the backward direction, the liquid material discharged from the discharge head 33 cannot be irradiated with the ultraviolet light 41 by the ultraviolet irradiation device 15 immediately after the discharge. Thereafter, the ultraviolet light 41 can be irradiated by the ultraviolet irradiation device 15 to the liquid material discharged during the return movement of the head unit 13. When the head unit 13 moves forward, the ultraviolet light 41 can be irradiated by the ultraviolet irradiation device 15 immediately after the liquid is discharged, so that the liquid from the discharge head 33 has a relatively long effective time (hard to harden). When the head unit 13 moves backward, the liquid is irradiated with the ultraviolet light 41 by the ultraviolet irradiation device 15 after a time after discharge. Therefore, the liquid discharged from the discharge head 33 is discharged during the forward movement. A liquid that is harder than the body is discharged. As a result, the liquid 53 applied to the workpiece W can be sufficiently cured. Therefore, since the liquid 53 applied to the workpiece W can be sufficiently cured by one ultraviolet irradiation device 15 with respect to one droplet discharging device 1, the low-cost droplet discharging device 1 is used. Can be manufactured.

  In the present embodiment, the liquid droplet 55a discharged from the discharge head 33 when the head unit 13 moves in the forward direction is equal to the discharge amount when the head unit 13 moves in the backward direction. It is larger than the droplet amount of the droplet 55 b ejected from 33. For this reason, since the ultraviolet irradiation device 15 can irradiate the ultraviolet light 41 immediately after ejecting the droplet 55a having a large droplet amount that is hard to be cured when the head unit 13 moves in the forward direction, it is applied to the workpiece W. The liquid 53 thus formed can be sufficiently cured.

  In the present embodiment, the moving speed when the head unit 13 moves in the forward direction is slower than the moving speed when the head unit 13 moves in the backward direction. When the head unit 13 moves in the forward direction, the time until the ultraviolet light 41 is applied to the droplets 55a discharged from the discharge head 33 by the ultraviolet irradiation device 15, and the head unit 13 moves in the backward direction. Sometimes, the difference from the time until the ultraviolet light 41 is irradiated by the ultraviolet irradiation device 15 to the droplet 55b discharged from the discharge head 33 can be reduced. Thereby, the liquid 53 applied to the workpiece W can be sufficiently cured.

  In the present embodiment, the amount of the droplet 55a discharged from the discharge head 33 when the head unit 13 moves in the forward direction is the amount discharged from the discharge head 33 when moved in the return direction of the head unit 13. However, the present invention is not limited to this. This is because the ease of curing of the droplet by the ultraviolet light 41 from the ultraviolet irradiation device 15 may not depend on the amount of the droplet. In this case, the droplet amount is changed so that the droplet amount discharged from the discharge head 33 in the forward path and the return path of the head unit 13 can be properly cured by the ultraviolet light 41 from the ultraviolet irradiation device 15.

  In this embodiment, the ultraviolet irradiation device 15 stops the irradiation when the head unit 13 moves in the backward direction. However, the droplet 55b is ejected from the ejection head 33 when the head unit 13 moves in the backward direction. However, the ultraviolet light 41 may be irradiated. In this case, since the ultraviolet light 41 can be applied to the liquid 53 discharged from the discharge head 33 in the forward path, the liquid 53 can be cured more reliably.

  In this embodiment, the liquid material 53 is discharged from the discharge head 33 in both directions when the head unit 13 moves in the forward direction and when the head unit 13 moves in the backward direction. The liquid 53 may be discharged. In this case, since all the liquid bodies 53 ejected from the ejection head 33 can be irradiated with the ultraviolet light 41 immediately after ejection, the liquid body 53 can be cured more reliably.

  In the present embodiment, the liquid material 53 is discharged from the discharge head 33 in both directions when the head unit 13 moves in the forward direction and when it moves in the backward direction. The operation of only irradiating the ultraviolet light 41 from the ultraviolet irradiation device 15 may be performed without discharging the liquid material from the head 33. In this case, since the liquid 53 discharged from the discharge head 33 can be irradiated with the ultraviolet light 41 separately from the ultraviolet irradiation after discharge, the liquid 53 can be cured more reliably.

(Second Embodiment)
Next, different embodiments of the droplet discharge device 1 will be described with reference to the drawings.
FIG. 8 is a front view of the carriage according to the second embodiment of the droplet discharge device as viewed in the direction A in FIG. Since the droplet discharge device 1 of the present embodiment is the same as that of the first embodiment except for the carriage, the configuration other than the carriage is the same as that of the first embodiment, and the description thereof is omitted.
In FIG. 8, the carriage 7 ′ in the droplet discharge device 1 of the second embodiment includes a head unit 13 and two ultraviolet irradiation devices 16 a and 16 b. The ultraviolet irradiation device 16a is provided so as to be located rearward with respect to the traveling direction when the head unit 13 moves in the forward direction. Further, the ultraviolet irradiation device 16b is provided so as to be located rearward with respect to the traveling direction when the head unit 13 moves in the backward direction.
In the present embodiment, it is assumed that the ultraviolet irradiation device 16a has higher illuminance than the ultraviolet irradiation device 16b.
However, the ultraviolet irradiation device 16a may have lower illuminance than the ultraviolet irradiation device 16b.

The liquid droplet 53a discharged from the discharge head 33 when the head unit 13 moves in the forward direction (X (+) direction) is cured by the ultraviolet light 44a from the light source 45a of the ultraviolet irradiation device 16a.
The liquid droplet 53b ejected from the ejection head 33 when the head unit 13 moves in the backward direction (X (−) direction) is cured by the ultraviolet light 44b from the light source 45b of the ultraviolet irradiation device 16b.
As the light sources 45a and 45b, for example, various light sources 45a and 45b such as LED, LD, mercury lamp, metal halide lamp, xenon lamp, and excimer lamp can be adopted.
Examples of means for changing the illuminance of the ultraviolet irradiation devices 16a and 16b include changing the types of the light sources 45a and 45b, or changing the current value in an LED or the like.

Here, a drawing method in the droplet discharge device according to the second embodiment provided with the carriage 7 ′ will be described. FIG. 9 is an explanatory diagram illustrating the drawing operation of the droplet discharge device according to the second embodiment when viewed in the direction A in FIG.
As shown in FIG. 9A, when the head unit 13 moves in the forward direction, the ultraviolet irradiation device 16a is positioned rearward with respect to the traveling direction of the head unit 13. For this reason, it is possible to irradiate the liquid droplet 53a discharged from the discharge head 33 with the ultraviolet light 44a by the ultraviolet irradiation device 16a having high illuminance immediately after the discharge. Therefore, when the head unit 13 moves in the forward direction, the liquid that is relatively hard to be cured is discharged, so that the liquid that is hard to be hardened can be effectively cured.

On the other hand, as shown in FIG. 9B, the ultraviolet irradiation device 16 b is located behind the head unit 13 when the head unit 13 moves in the backward direction. Therefore, the ultraviolet light 44b can be irradiated from the ultraviolet irradiation device 16b to the liquid droplet 53b discharged from the discharge head 33 immediately after the discharge. Since the ultraviolet irradiation device 16b has lower illuminance than the ultraviolet irradiation device 16a, when the head unit 13 moves in the backward direction, a liquid material that is harder than the liquid material discharged when moving in the forward direction is discharged. The liquid can be effectively cured.
In this case, the liquid that is hard to harden refers to a liquid having a larger droplet amount than the droplet 53b in FIG. 9B, such as a droplet 53a shown in FIG.

  As described above, the two ultraviolet irradiation devices 16a and 16b are mounted on the carriage 7 'of the droplet discharge device of the present embodiment. Here, the ultraviolet irradiating device 16a having higher illuminance than the ultraviolet irradiating device 16b is provided so as to be located rearward with respect to the traveling direction when the head unit 13 moves in the forward direction. Further, the ultraviolet irradiation device 16b is provided so as to be located rearward with respect to the traveling direction when the head unit 13 moves in the backward direction. For this reason, when the head unit 13 moves forward, the ultraviolet light 44a having higher illuminance than the ultraviolet light irradiation device 16b can be irradiated by the ultraviolet light irradiation device 16a immediately after the liquid droplet 53a discharged from the discharge head 33 is discharged. Therefore, it is only necessary to eject liquid droplets 53a which are hard to be cured from the ejection head 33. Further, when the head unit 13 moves backward, the liquid droplet 53b discharged from the discharge head 33 is irradiated from the ultraviolet irradiation device 16b with ultraviolet light 44b having lower illuminance than the ultraviolet irradiation device 16a immediately after discharging. For this reason, the discharge head 33 may discharge a liquid material that is harder than the outward movement. As a result, the liquid applied to the workpiece W can be sufficiently cured. Therefore, by mounting one ultraviolet irradiating device 16a having a high illuminance and one ultraviolet irradiating device 16b having a low illuminance on one droplet discharge device, the liquid applied to the workpiece W can be sufficiently obtained. Therefore, it is possible to perform drawing with a droplet discharge device that is less expensive than mounting two ultraviolet irradiation devices with high illuminance.

  In the present embodiment, when the head unit 13 moves in the forward direction, the amount of the liquid droplet 53a ejected from the ejection head 33 is the same as the ejection head when the head unit 13 moves in the backward direction. It is larger than the droplet amount of the droplet 53b ejected from 33. For this reason, when the head unit 13 moves in the forward direction, a droplet 53a with a large amount of liquid that is hard to be cured is discharged, and when the head unit 13 moves in the backward direction, a droplet 53b with a small amount of liquid that is easy to cure is discharged. To do. For this reason, the liquid applied to the workpiece W can be sufficiently cured by one ultraviolet irradiation device 16a having a high illuminance and one ultraviolet irradiation device 16b having a low illuminance.

  In the present embodiment, the moving speed when the head unit 13 moves in the forward direction is slower than the moving speed when the head unit 13 moves in the backward direction. When the head unit 13 moves in the forward direction, the liquid material discharged from the discharge head 33 is discharged from the discharge head 33 by increasing the time until the ultraviolet light 44a is irradiated by the ultraviolet irradiation device 16a. The droplet 53a that is hard to be cured can be sufficiently cured. For this reason, the liquid applied to the workpiece W can be sufficiently cured.

  In the present embodiment, the amount of the droplet 53a discharged from the discharge head 33 when the head unit 13 moves in the forward direction is discharged from the discharge head 33 when moved in the backward direction of the head unit 13. However, the present invention is not limited to this. This is because the ease of curing of the droplets by the ultraviolet light 44a and 44b from the ultraviolet irradiation devices 16a and 16b may not depend on the amount of droplets. In this case, the droplet amount is changed so that the droplet amount discharged from the discharge head 33 in the forward path and the return path of the head unit 13 can be properly cured by the ultraviolet light 44a and 44b from the ultraviolet irradiation devices 16a and 16b.

  DESCRIPTION OF SYMBOLS 1 ... Droplet discharge apparatus, 3 ... Work conveying apparatus, 7, 7 '... Carriage, 11 ... Carriage conveying apparatus, 13 ... Head unit, 15, 16a, 16b ... Ultraviolet irradiation apparatus, 21 ... Surface plate, 21a ... Surface plate 23a, 23b ... guide rail, 25 ... work table, 25a ... mounting surface on which a work as a recording medium is placed, 31 ... head plate, 33 ... ejection head, 35 ... nozzle surface, 37 ... nozzle, 39 , 39a to 39d ... nozzle row, 41, 44a, 44b ... ultraviolet light, 43, 45a, 45b ... light source, 46 ... nozzle plate, 47 ... cavity plate, 48 ... vibration plate, 49 ... piezoelectric element, 51 ... cavity 53 ... Liquid material, 53a, 53b, 55a, 55b ... Liquid droplets, 101 ... Stand, 103 ... Guide rail, 107 ... A pair of support columns, 107a, 1 7b: support, 111 ... control unit, 113 ... CPU, 115 ... drive control unit, 117 ... memory unit, 119 ... bus, 121 ... carriage conveyance motor, 123 ... work conveyance motor, 129 ... input device, 131 ... display device, 133: Input / output interface, 135: Program software, 137: Data development unit, 141: Motor control unit, 145 ... Discharge control unit, 147 ... Irradiation control unit, 151 ... Display control unit, W: Work as a recording medium.

Claims (6)

An ejection head for ejecting a liquid material having a property of being cured by irradiation of ultraviolet rays toward a recording medium;
A head holding member for holding the discharge head;
A main scanning direction displacement device for reciprocating the position of the head holding member with respect to the recording medium in a first direction in the main scanning direction and a second direction opposite to the first direction;
A sub-scanning direction displacement device that intermittently changes the position of the recording medium relative to the head holding member in a sub-scanning direction intersecting the main scanning direction;
A drawing method using a droplet discharge device, comprising: an ultraviolet irradiation device that is provided on a side surface of the head holding member in the main scanning direction and irradiates the liquid material discharged to the recording medium with ultraviolet rays. ,
The ultraviolet irradiation device is provided on a side surface of the head holding member on the second direction side;
When the head holding member is scanned in the second direction when the head holding member is scanned in the first direction, the curing time of the first liquid discharged from the discharge head by the irradiation of the ultraviolet rays is The drawing method is characterized in that the second liquid discharged from the discharge head is longer than the curing time by the irradiation of the ultraviolet rays.   The drawing method according to claim 1, wherein a droplet amount of the first liquid material is larger than a droplet amount of the second liquid material.   The moving speed when the head holding member is scanned in the first direction is made slower than the moving speed when the head holding member is scanned in the second direction. 2. The drawing method according to 2. An ejection head for ejecting a liquid material having a property of being cured by irradiation of ultraviolet rays toward a recording medium;
A head holding member for holding the discharge head;
A main scanning direction displacement device for reciprocating the position of the head holding member with respect to the recording medium in a first direction in the main scanning direction and a second direction opposite to the first direction;
A sub-scanning direction displacement device that intermittently changes the position of the recording medium relative to the head holding member in a sub-scanning direction intersecting the main scanning direction;
A first ultraviolet irradiation device that is provided on one first side surface of both side surfaces of the head holding member in the main scanning direction and irradiates the liquid material discharged to the recording medium with ultraviolet rays;
A second ultraviolet irradiation device that is provided on a second side surface of the head holding member opposite to the first side surface in the main scanning direction and that irradiates the liquid material discharged to the recording medium with ultraviolet rays. A drawing method using the provided droplet discharge device,
The first ultraviolet irradiation device has a higher ultraviolet illuminance than the second ultraviolet irradiation device,
When the first ultraviolet irradiation device is positioned behind the head holding member with respect to the scanning direction of the head holding member, the curing time by the irradiation of the ultraviolet rays of the first liquid discharged from the discharge head is as follows: When the second ultraviolet ray irradiation device is positioned behind the head holding member with respect to the scanning direction of the head holding member, the second liquid material discharged from the discharge head is longer than the curing time due to the ultraviolet ray irradiation. A drawing method characterized by being long.   The drawing method according to claim 4, wherein a droplet amount of the first liquid material is larger than a droplet amount of the second liquid material.   The moving speed of the head holding member in the scanning direction for discharging the first liquid material is made slower than the moving speed of the head holding member in the scanning direction for discharging the second liquid material. The drawing method according to claim 4 and 5.

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