JP2011245778A - Liquid droplet discharging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid droplet discharging apparatus that has improved work conveyance accuracy.SOLUTION: The apparatus includes: a liquid droplet discharging head having a plurality of nozzle holes; detecting sections; a work conveying section for conveying a work; and a control section. The control section discharges liquid droplets from different nozzle holes of the plurality of nozzle holes of the liquid discharging head. An alignment mark is formed on the work. On the basis of the position where the alignment mark is detected by the detecting section, the work conveyance section conveys the work.

Description

  The present invention relates to a droplet discharge device.

  A droplet discharge device that discharges droplets toward a workpiece and applies a functional liquid onto the workpiece includes, for example, a droplet discharge head that discharges the functional liquid as droplets, and moves the droplet discharge head in the main scanning direction. A head moving means for moving the work, a work moving means for moving the work in the sub-scanning direction, and the like. In such a droplet discharge device, it is necessary to improve the workpiece conveyance accuracy in order to reduce the occurrence of white streaks due to variations in the workpiece conveyance amount. Therefore, a mark recording unit that discharges a droplet from the nozzle hole of the droplet discharge head toward the workpiece to form a predetermined mark on the workpiece, a mark detection unit that detects a mark formed on the workpiece, And the workpiece is moved using the position of the mark detected by the mark detection means as the amount of movement of the workpiece (for example, see Patent Document 1).

JP 2004-188954 A

  However, in the above-described droplet discharge device, a mark serving as a reference for the amount of workpiece transport is formed by droplets discharged from one nozzle hole. In other words, the reference mark is formed using the same nozzle hole. For this reason, the landing position of the droplets on the workpiece varies due to the occurrence of, for example, flying bends, etc., such as the droplet discharge characteristics of the nozzle holes from which the droplets are discharged. There was a problem that the dispersion and the workpiece conveyance accuracy were lowered.

  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 droplet discharge apparatus according to this application example includes a droplet discharge head having a plurality of nozzle holes, a detection unit, a workpiece transfer unit that transfers a workpiece, and a control unit, and the control The unit discharges droplets from different nozzle holes of the plurality of nozzle holes of the droplet discharge head, forms an alignment mark on the workpiece, and detects the alignment mark detected by the detection unit The workpiece is conveyed to the workpiece conveyance unit based on the position.

  According to this configuration, the alignment mark is formed on the workpiece by the droplets ejected from different nozzle holes. That is, one alignment mark is formed using a plurality of nozzle holes. For this reason, the error of the landing position on the work caused by the flight bend of the droplet discharged from each nozzle hole is dispersed (averaged). And since a workpiece | work is conveyed based on the detection position of an alignment mark, the conveyance precision of a workpiece | work can be improved. The drawing resolution can be increased with the improvement of the workpiece conveyance accuracy.

  Application Example 2 The control unit of the droplet discharge device according to the application example discharges the droplets from the first nozzle holes arranged on the upstream side with respect to the conveyance direction of the workpiece and causes the droplets onto the workpiece. A first mark is formed and a second mark is formed on the workpiece by discharging the droplets from a second nozzle hole disposed downstream of the first nozzle hole in the conveyance direction of the workpiece. However, in the process of transporting the workpiece in the workpiece transport direction, the alignment mark is formed by the first mark and the second mark.

  According to this configuration, the alignment mark is formed by the first mark and the second mark formed by discharging droplets from different nozzle holes. For this reason, the error of the landing position on the work caused by the flight bend of the droplet discharged from the nozzle hole of each droplet discharge head is dispersed (averaged). And since a workpiece | work is conveyed based on the detection position of an alignment mark, the conveyance precision of a workpiece | work can be improved.

  Application Example 3 The control unit of the liquid droplet ejection apparatus according to the application example described above is configured so that the ratio between the first mark and the second mark in the alignment mark is halved. Two marks are formed.

  According to this configuration, since the first mark and the second mark are formed substantially equally, it is possible to average the error of the landing positions of the droplets.

  Application Example 4 The control unit of the liquid droplet ejection apparatus according to the application example described above forms the alignment marks at both ends of the work in the width direction of the work orthogonal to the conveyance direction of the work, and the detection unit The workpiece is transported to the workpiece transport unit based on the detected positions of both of the alignment marks formed at the both ends detected in step (b).

  According to this configuration, the alignment marks are formed at both ends of the workpiece, and the workpiece is conveyed based on the detection positions of both the alignment marks. Therefore, the workpiece can be conveyed more accurately.

  Application Example 5 The liquid droplet ejection apparatus according to the application example includes a correction unit that corrects the θ shift of the workpiece with respect to the conveyance direction of the workpiece based on the detection result of the detection unit. .

  According to this configuration, the θ deviation of the workpiece is corrected, and the conveyance accuracy can be further improved.

Schematic which shows the structure of a droplet discharge apparatus. FIG. 3 is a schematic diagram illustrating a configuration of a droplet discharge head. 6 is a flowchart showing a method for controlling the droplet discharge device. Explanatory drawing which shows the formation method of an alignment mark, and the conveyance method of a workpiece | work. Explanatory drawing which shows the formation method of an alignment mark, and the conveyance method of a workpiece | work. Explanatory drawing which shows the shape of a 1st mark, a 2nd mark, and an alignment mark. Explanatory drawing which shows the shape of another alignment mark.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described with reference to the drawings. In addition, in order to make each member in each drawing into a size that can be recognized on each drawing, the members are illustrated with different scales.

(Configuration of droplet discharge device)
First, the configuration of the droplet discharge device will be described. The droplet discharge device includes a droplet discharge head having a plurality of nozzle holes, a detection unit, a workpiece transfer unit that transfers a workpiece, and a control unit. Then, the control unit discharges droplets from different nozzle holes among the plurality of nozzle holes of the droplet discharge head, forms an alignment mark on the workpiece, and sets the alignment mark at the detection position detected by the detection unit. Based on this, the workpiece is transferred to the workpiece transfer unit. The droplet discharge device further includes a correction unit that corrects the θ shift of the workpiece with respect to the conveyance direction of the workpiece based on the detection result of the detection unit.

  Hereinafter, a specific configuration will be described. FIG. 1 is a schematic diagram showing a configuration of a droplet discharge device. In the present embodiment, for example, ultraviolet curable ink (UV ink) as a functional liquid is ejected by a droplet ejection head to a thin film-like workpiece W to be supplied and removed in a so-called reel-to-reel format. Thus, a liquid droplet ejection apparatus that prints a desired image or the like will be described. In the following description, the conveyance direction of the workpiece W (longitudinal direction of the workpiece) is the X-axis direction, the direction orthogonal to the X-axis direction (moving direction of the droplet discharge head) is the Y-axis direction, and the workpiece W The direction of rotation in the parallel plane is defined as the θ direction.

  As shown in FIG. 1, the droplet discharge device 1 includes a machine base 2, a feeding device 3 that feeds out a long workpiece W wound in a roll shape, and a winding device 4 that winds up a printed workpiece W. A work stage 5 disposed on the machine base 2 for sucking and setting the supplied work W, a stage rotating unit 6 as a correcting unit for rotating the work stage 5 in the θ direction, and extending in the X-axis direction. The X-axis table (sub-scanning movement table) 7 that transports the workpiece W in the X-axis direction via the stage rotating unit 6 and the work stage 5 and the Y-axis direction so as to straddle the X-axis table 7 A Y-axis table (main scanning movement table) 8, a plurality of carriage units 9 mounted on the Y-axis table 8 movably, and a droplet discharge head 51 mounted on the carriage unit 9 are provided. In addition, a detection unit 12 that detects an alignment mark M formed by the droplet discharge head 51 is provided. These devices are controlled by the control unit 60.

  In the droplet discharge device 1 according to the present embodiment, after the work W fed by the feeding device 3 is sucked by the work stage 5, the alignment mark M is formed by using the droplet discharge head 51, and the alignment mark M is detected. The workpiece W is conveyed in the X-axis direction by the X-axis table 7 (sub-scanning) and the carriage unit 9 is reciprocated (main-scanning) based on the detected position of the alignment mark M detected by the section 12. Ink is discharged from the droplet discharge head 51 to perform printing processing. In addition, while printing is performed on a printing area corresponding to the size of the work stage 5, the work W is sequentially fed by the feeding device 3 and the winding device 4, and is sequentially wound.

  In addition, the droplet discharge device 1 includes a maintenance device 11 including a suction unit 14 for forcibly discharging ink from the droplet discharge head 51 and a wiping unit 15 for wiping the nozzle surface 57 after suction. The maintenance device 11 is disposed in a maintenance area that is deviated in the Y-axis direction from the printing area where the X-axis table 7 and the Y-axis table 8 intersect, and performs maintenance of the droplet discharge head 51 that faces the maintenance area. Is.

  The work stage 5 has a plurality of suction holes (not shown) formed on the surface (set surface), and sucks the work W sent from the feeding device 3. The workpiece stage 5 is conveyed and moved in the X-axis direction (from the upstream side to the downstream side) by the X-axis table 7 with the workpiece W adsorbed (sub scanning). Then, when reaching the downstream end position (drawing end position) where drawing for one image area is completed, the suction of the work W is released, and after the nip state of the feeding roller 23 and the sending roller 27 is released, X The shaft table 7 returns to the upstream end position (drawing start position).

  The stage rotating unit 6 supports the work stage 5 from the lower surface and slightly rotates the work stage 5 in the θ direction in a plane parallel to the set surface of the work W. Specifically, based on the detection result of the alignment mark M, when the work W on the work stage 5 has a θ shift with respect to a predetermined position, the stage rotating unit 6 is driven, and the work stage 5 is moved. Adjust minute rotation (θ correction).

  The X-axis table 7 is disposed on the machine base 2 and supports the work stage 5 slidably in the X-axis direction via a pair of X-axis guide rails 31 extending in the X-axis direction and the stage rotating unit 6. And a pair of motor-driven X-axis sliders 32. The X-axis table 7 stops when the droplet discharge head 51 moves forward (or backward), and moves the workpiece W to the X-axis based on the detection position of the alignment mark M until the next backward movement (or backward movement). Move downstream in the direction. That is, the X-axis table 7 transports (sub-scans) the workpiece W in parallel with the reciprocating motion (main scanning) of the droplet discharge head 51. The sub-scanning movement axis is composed of a pair of X-axis guide rails 31 and an X-axis slider 32. The drive system is preferably composed of a linear motor, a motor, a lead screw mechanism, and the like.

  The Y-axis table 8 includes a gate-shaped base frame 33 that extends across the machine base 2 in the Y-axis direction, and a pair of Y-axis guides that are disposed on the base frame 33 and extend in the Y-axis direction. Rails 34a and 34b, a carriage unit 9, and a motor-driven Y-axis slider 36 that slidably supports the carriage unit 9 in the Y-axis direction are provided. The Y-axis table 8 reciprocates the droplet discharge head 51 in the Y-axis direction during printing via each carriage unit 9 and causes the droplet discharge head 51 to face the maintenance device 11. The main scanning movement axis is composed of a pair of Y-axis guide rails 34 and a Y-axis slider 36. In this case as well, the drive system is preferably composed of a linear motor, a motor, a lead screw mechanism, and the like. A pair of ultraviolet lamps 45 are mounted on both ends of the carriage unit 9 in the Y-axis direction.

  The detection unit 12 detects the alignment mark M formed on the workpiece W. In the present embodiment, the two detection units 12a and 12b are provided on the Y-axis guide rail 34b downstream of the pair of Y-axis guide rails 34a and 34b with respect to the conveyance direction of the workpiece W. That is, it is provided downstream of the droplet discharge head 51. Further, a single detection unit 12 or a plurality of detection units 12 can be provided. That is, the number of detection units 12 corresponding to the number of alignment marks M to be detected is provided (in this embodiment, two alignment marks M are formed). For example, when the number of alignment marks M to be detected is two, a configuration in which one detection unit 12 is installed and the detection unit 12 is moved to detect the two alignment marks M may be employed. . A detection unit position adjustment mechanism that adjusts the position of the detection unit 12 in the Y direction according to the distance between the two alignment marks M or according to the width of the workpiece W may be provided. According to this, the alignment mark M can be detected regardless of the distance between the alignment marks M or the width of the workpiece W. Therefore, regardless of the distance between the alignment marks M and the width of the workpiece W, the workpiece conveyance accuracy can be improved. Further, even when the width of the workpiece W is variable, it can be dealt with in the same manner as described above by appropriately providing the detecting unit 12 with moving means.

  Next, the configuration of the droplet discharge head will be described. FIG. 2 is a schematic diagram showing the configuration of the droplet discharge head. The droplet discharge head 51 discharges ink as droplets toward the workpiece W, forms an image on the workpiece W, and forms an alignment mark M. As shown in FIG. 2, the carriage unit 9 includes a head unit 50. The head unit 50 is composed of a plurality of droplet discharge heads 51. The head unit of the present embodiment is composed of nine droplet discharge heads 51.

  The droplet discharge head 51 of this embodiment has a nozzle surface 57 having a large number of nozzle holes 56. And the cavity (not shown) provided corresponding to each nozzle hole 56 and the piezoelectric element (not shown) provided corresponding to each cavity are provided. When a voltage is applied to the piezoelectric element and the volume of the cavity decreases, a droplet (ink droplet) is ejected from the nozzle hole 56 by a pump action. In addition, since inks having different colors are introduced into the respective droplet discharge heads 51, different color inks can be discharged from the respective droplet discharge heads 51.

  The ink in this embodiment is a so-called ultraviolet curable ink, and the ultraviolet curable ink can be cured and fixed by the ultraviolet rays irradiated from the ultraviolet lamp 45. The ultraviolet lamp 45 is composed of, for example, an LED. Note that the pair of ultraviolet lamps 45 may be alternately turned on in response to the reciprocation (main scanning) of the droplet discharge head 51. That is, during the forward movement, one ultraviolet lamp 45 on the side that follows the droplet discharge head 51 may be turned on, and when the backward movement is performed, the other ultraviolet lamp 45 on the side that follows the droplet discharge head 51 may be turned on. .

  Next, a method for controlling the droplet discharge device will be described. FIG. 3 is a flowchart showing a method for controlling the droplet discharge device. FIGS. 4 and 5 are explanatory views showing a method for forming an alignment mark and a method for conveying a workpiece.

  First, in step S1, the work W is fed onto the work stage 5 and the work W is attracted. Specifically, the feeding device 3 and the winding device 4 are driven to sequentially feed the workpiece W, and the suction mechanism of the workpiece stage 5 is driven to suck the workpiece W onto the workpiece stage 5.

  Next, in step S2, as shown in FIG. 4A, the carriage unit 9 is moved in the main scanning direction, and among the plurality of nozzle holes 56 provided in the droplet discharge head 51, the workpiece W is conveyed in the conveyance direction. A droplet is ejected from the first nozzle hole 56a disposed on the upstream side with respect to the (X-axis direction) to form the first mark Ma1 on the work W, and the work W is moved toward the first nozzle hole 56a. A droplet is ejected from the second nozzle hole 56b arranged on the downstream side in the transport direction to form the second mark Mb1 on the workpiece W. In this case, the first and second marks Ma1, Mb1 are formed in the vicinity of both ends of the workpiece W in the width direction of the workpiece W orthogonal to the conveyance direction of the workpiece W. The shapes of the first and second marks Ma1 and Mb1 at this time are not particularly limited. For example, as shown in FIG. 6A, the first and second marks Ma1 and Mb1 have a substantially linear first shape along the main scanning direction of the droplet discharge head 51. One mark Ma1 is formed. Similarly, as shown in FIG. 6B, a substantially linear second mark Mb1 along the main scanning direction of the droplet discharge head 51 is formed.

  Next, in step S3, the work stage 5 on which the work W is attracted is moved in the transport direction (X-axis direction), and the detection unit 12 detects the second mark Mb1. Then, based on the detection result of the second mark Mb1 by the detection unit 12, the workpiece W is conveyed (moved) in the sub-scanning direction (X direction) to a predetermined position. For example, as shown in FIG. 4B, the workpiece W is moved with reference to the center position of the detected second mark Mb1. That is, in this step S3 of the present embodiment, the length between the pitches of the first nozzle hole 56a and the second nozzle hole 56b is moved in the transport direction. Accordingly, the first mark Ma1 is moved to the vicinity of the upper scanning position of the second nozzle hole 56b. Note that drawing is not performed on the workpiece W immediately after this step S3. This is because the second mark Mb1 is formed only from the second nozzle hole 56b. For this reason, when the work W is transported with the second mark Mb1 as a reference position, the transport position accuracy of the work W may be deteriorated due to, for example, a flying curve of a droplet discharged from the second nozzle hole 56b. There is. Therefore, when drawing on the workpiece W, there arises a problem that white stripes, stripe irregularities and the like occur.

  Next, in step S4, an alignment mark M is formed. Specifically, as shown in FIG. 4C, the plurality of nozzle holes 56 provided in the droplet discharge head 51 are arranged upstream of the workpiece W conveyance direction (X-axis direction). In addition, a first mark Ma2 is formed on the workpiece W by discharging droplets from the first nozzle hole 56a, and the second nozzle hole disposed on the downstream side in the conveyance direction of the workpiece W with respect to the first nozzle hole 56a. A droplet is discharged from 56b to form the second mark Mb2 on the workpiece W. Then, as described in step S3, the first mark Ma1 formed earlier is moved to the vicinity of the scanning of the second nozzle hole 56b, so that the second mark Mb2 is formed on the first mark Ma1, As shown in FIG. 6C, the alignment mark M1 is formed by the first mark Ma1 and the second mark Mb2. As described above, the alignment mark M1 is formed by droplets ejected from different nozzle holes 56, that is, in the present embodiment, from the first nozzle hole 56a and the second nozzle hole 56b, respectively. The first mark Ma1 and the second mark Mb2 are formed so that the ratio between the first mark Ma1 and the second mark Mb2 in the alignment mark M1 is halved. Similarly to the above, alignment marks M1 are formed in the vicinity of both ends of the workpiece W in the width direction of the workpiece W orthogonal to the conveyance direction of the workpiece W.

  Next, in step S5, the detection unit 12 is used to detect the alignment marks M1 formed on both ends of the work W, and the work W is transported based on the detection positions of both alignment marks M1. That is, the alignment mark M1 in which the landing position deviation errors of the droplets caused by the respective nozzle holes (first and second nozzle holes 56a and 56b) are dispersed (averaged) is detected. Specifically, as shown in FIG. 4D, the X-axis table 7 is driven to move the workpiece W on the workpiece stage 5 in the sub-scanning direction. In this case, the center point of the alignment mark M1 is detected by the detection unit 12, and the workpiece W is moved with the center point of the alignment mark M1 as a reference position.

  In step S5, detection is performed using both of the detection units 12a and 12b that detect the center point of the alignment mark M1, but the detection position of one of the alignment marks M1 deviates from a predetermined position. There is. In this case, there is a high possibility that the position of the workpiece W is shifted in the θ direction. Therefore, in step S6, it is determined whether or not θ correction of the workpiece W is necessary. If θ correction is necessary (YES), the process proceeds to step S7. If θ correction is not necessary (NO), the process proceeds to step S8.

  In step S7, θ correction of the workpiece W is performed. Specifically, as shown in FIG. 5E, the work stage 5 is rotated by driving the stage rotating unit 6 in a predetermined θ direction, and θ of the work W set on the work stage 5 is obtained. Misalignment correction in the direction is performed. Then, when both alignment marks M1 reach a predetermined position, the process ends.

  In step S8, the image P is formed on the workpiece W, and the first and second marks Ma3 and Mb3 are newly formed. Specifically, as shown in FIG. 5F, the carriage unit 9 and the droplet discharge head 51 are driven to discharge droplets toward the workpiece W, thereby forming an image P on the workpiece W. . Further, the first mark Ma3 is formed on the work W by discharging droplets from the first nozzle hole 56a arranged on the upstream side with respect to the conveying direction of the work W, and the work is made with respect to the first nozzle hole 56a. A second mark Mb3 is formed on the workpiece W by discharging droplets from the second nozzle hole 56b arranged on the downstream side in the W conveying direction. Then, the alignment mark M2 is formed by the first mark Ma2 and the second mark Mb3 that are formed previously. That is, the alignment mark M2 is formed by droplets discharged from different first nozzle holes 56a and second nozzle holes 56b. Here, the alignment mark M2 may be disposed to face the image P.

  In step S9, it is determined whether or not to end drawing. If the drawing is to be ended (YES), the driving of the droplet discharge device 1 is ended. If the drawing is not ended and the drawing is continued (NO), the process proceeds to step S10.

  In step S10, the suction of the workpiece W from the workpiece stage 5 is released. Then, the work stage 5 is moved to a predetermined position. Next, the process proceeds to step S1.

  Therefore, according to the above embodiment, the following effects can be obtained.

  (1) Droplets were ejected from different first and second nozzle holes 56a and 56b to form alignment marks M. That is, by forming one alignment mark M using a plurality of nozzle holes 56, errors in the landing positions on the workpiece W due to flying bends of droplets discharged from the nozzle holes 56 are dispersed. The And since the formation position of the alignment mark M is detected and the workpiece | work W is conveyed based on a detection result, the conveyance precision of the workpiece | work W can be improved.

  (2) Alignment marks M are formed at both ends in the width direction of the workpiece W (main scanning direction of the droplet discharge head 51), both alignment marks M are detected, and θ shift of the workpiece W is corrected as necessary. . Thereby, the workpiece | work W can be conveyed further accurately.

  In addition, it is not limited to said embodiment, The following modifications are mentioned.

  (Modification 1) In the above embodiment, the first mark Ma1 is formed by ejecting droplets from one first nozzle hole 56a, and the second droplet is ejected from one second nozzle hole 56b. Although the mark Mb1 is formed, the present invention is not limited to this. The first mark Ma1 or the second mark Mb1 may be formed using a plurality of nozzle holes 56 (predetermined nozzle group). In other words, the first mark Ma1 may be formed by discharging droplets from the plurality of nozzle holes 56, and the second mark Mb1 may be formed by discharging droplets from the plurality of nozzle holes 56. In this way, the landing position deviation error of the droplets caused by each nozzle hole is averaged, and the conveyance accuracy of the workpiece W can be improved.

  (Modification 2) In the above embodiment, the alignment mark M is formed by using one droplet discharge head 51, but the present invention is not limited to this. For example, the alignment marks M may be formed on the workpiece W by discharging droplets from the nozzle holes 56 of the different droplet discharge heads 51. Even in this case, since the alignment mark M is formed by droplets ejected from different nozzle holes 56, the conveyance accuracy of the workpiece W can be improved as described above.

  (Modification 3) In the above embodiment, the alignment mark M1 has a linear shape substantially parallel to the main scanning direction (substantially perpendicular to the sub-scanning direction). However, the present invention is not limited to this. For example, FIG. As shown in FIG. 4, it may have a linear shape substantially perpendicular to the main scanning direction (substantially parallel to the sub-scanning direction). Moreover, as shown in FIG.7 (b), a cross-shaped shape may be sufficient. Furthermore, as shown in FIG.7 (c), circular shape may be sufficient. In this example, the alignment mark M1 is formed by interlacing dots that respectively form the first mark Ma1 and the second mark Mb1. In this case, the ratio between the first mark Ma1 and the second mark Mb1 is approximately 50%. In this way, since the first mark Ma1 and the second mark Mb1 are formed substantially equally, it is possible to average the error of the landing positions of the droplets.

  (Modification 4) In the above embodiment, the first mark Ma1 and the second mark Mb2 are formed with the same color ink, but the first mark Ma1 and the second mark Mb2 may be formed with different color inks. Good. Even if it does in this way, the same effect as the above can be acquired.

  (Modification 5) In the method for controlling the droplet discharge device of the above embodiment, the process proceeds to step S1 after step S10 as shown in FIG. 3, but may proceed to step S5 after step S10. Here, the position correction of the workpiece W after step S10 may be performed using the alignment mark M1 or M2 already formed up to step S8. Even if it does in this way, the same effect as the above can be acquired.

  DESCRIPTION OF SYMBOLS 1 ... Droplet discharge device, 5 ... Work stage, 6 ... Stage rotation part, 7 ... X-axis table, 8 ... Y-axis table, 9 ... Carriage unit, 12 ... Detection part, 51 ... Droplet discharge head, 56 ... Each Nozzle hole, 56a ... 1st nozzle hole, 56b ... 2nd nozzle hole, 60 ... Control part.

Claims (5)

A droplet discharge head having a plurality of nozzle holes;
A detection unit;
A workpiece transfer section for transferring workpieces;
A control unit,
The controller is
Based on the detected position of the alignment mark detected by the detection unit, the droplet is discharged from different nozzle holes among the plurality of nozzle holes of the droplet discharge head, an alignment mark is formed on the workpiece. A droplet discharge device that transports the work to the work transport unit. The droplet discharge device according to claim 1,
The controller is
The liquid droplets are ejected from a first nozzle hole arranged on the upstream side with respect to the workpiece conveying direction to form a first mark on the workpiece, and the workpiece is conveyed to the first nozzle hole. In the process of transporting the workpiece in the workpiece transport direction while discharging the droplets from the second nozzle holes arranged on the downstream side in the direction to form the second mark on the workpiece, the first mark And the second mark to form the alignment mark. The droplet discharge device according to claim 2,
The controller is
The liquid droplet ejection apparatus, wherein the first mark and the second mark are formed so that a ratio of the first mark to the second mark in the alignment mark is halved. In the droplet discharge device according to any one of claims 1 to 3,
The controller is
The alignment marks are formed at both ends of the workpiece in the width direction of the workpiece orthogonal to the workpiece conveyance direction, and the detection positions of both of the alignment marks formed at the both ends detected by the detection unit are detected. The droplet discharge device, wherein the workpiece is transferred to the workpiece transfer unit. In the liquid droplet ejection apparatus according to any one of claims 1 to 4,
A droplet discharge apparatus comprising: a correction unit that corrects a θ shift of the workpiece with respect to a conveyance direction of the workpiece based on a detection result of the detection unit.

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