Patent Publication Number: US-2022212466-A1

Title: Droplet ejection device and droplet ejection method

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a U.S. continuation application filed under 35 U.S.C. § 111(a), of International Application No. PCT/JP2020/034657, filed on Sep. 14, 2020, which claims priority to Japanese Patent Application No. 2019-182502, filed on Oct. 2, 2019, the disclosures of which are incorporated herein by reference. 
    
    
     FIELD 
     The present disclosure relates to a droplet ejection device and a droplet ejection method. 
     BACKGROUND 
     In recent years, inkjet printing technology has been applied to industrial processes. For example, a color filter manufacturing process for a liquid crystal display is an example. Although a so-called piezo type head, which ejects a droplet by mechanical pressure or vibration, has been conventionally used as inkjet printing technology, an electrostatic ejection-type inkjet head, which can eject a finer droplet, is attracting attention. Japanese Laid Open Patent No. H10-34967 discloses an electrostatic ejection-type inkjet recording device. 
     SUMMARY 
     According to an embodiment of the present disclosure, a droplet ejection device includes a processor and a memory device configured to store a program, the program executed by the processor to cause the processor to acquire information of a droplet ejection unit including a plurality of nozzles, the plurality of nozzles moving in a first direction toward an object and ejecting a droplet and set ejection conditions of the droplet in each of the plurality of nozzles based on the acquired information of the droplet ejection unit. 
     The droplet ejection device may further include an inspection unit configured to inspect a shape of the nozzles provided in the droplet ejection unit, and the information of the droplet ejection unit may include information of an opening of the nozzle. 
     The droplet ejection device may further include an inspection unit configured to inspect a shape of the droplet ejected from the nozzles provided in the droplet ejection unit, and the information of the droplet ejection unit may include the information associated with the shape of the ejected droplet. 
     In the droplet ejection device, the droplet ejection unit may include a first nozzle ejecting a first droplet and a second nozzle ejecting a second droplet, the second nozzle being arranged adjacent to the first nozzle in a second direction intersecting the first direction, and the first nozzle and the second nozzle may be arranged on a structure extending in the second direction. 
     In the droplet ejection device, the program may cause the processor to set a time to start ejecting the second droplet from the second nozzle earlier than a time to start ejecting the first droplet from the first nozzle when a center of an opening of the second nozzle is arranged further in the first direction than a center of an opening of the first nozzle. 
     In the droplet ejection device, the program may cause the processor to set a time to eject the second droplet from the second nozzle longer than a time to eject the first droplet from the first nozzle when an opening of the second nozzle is smaller than an opening of the first nozzle. 
     In the droplet ejection device, the program may cause the processor to set a time to start ejecting the second droplet from the second nozzle after an ending time of ejecting the first droplet from the first nozzle when a center of an opening of the second nozzle is arranged further in the second direction than a center of an opening of the first nozzle. 
     The droplet ejection device may include a second droplet ejection unit different from the droplet ejection unit, and the second droplet ejection unit may eject a droplet based on the information of the droplet ejection unit. 
     According to an embodiment of the present disclosure, there is provided a droplet ejection method configured to inspect a droplet ejection unit, the droplet ejection unit moving in a first direction toward an object, acquire information of the inspected droplet ejection unit, and set ejection conditions of the droplet based on the acquired information of the droplet ejection unit. 
     In the droplet ejection method, the information of the inspected droplet ejection unit may include information of an opening of a nozzle provided in the droplet ejection unit. 
     In the droplet ejection method, the information of the inspected droplet ejection unit may include information associated with the shape of the droplet ejected from a nozzle provided in the droplet ejection unit. 
     In the droplet ejection method, a plurality of nozzles provided in the droplet injection unit includes a first nozzle ejecting a first droplet and a second nozzle ejecting a second droplet, the second nozzle being arranged adjacent to the first nozzle in a second direction intersecting the first direction, and the first nozzle and the second nozzle are arranged on a structure extending in the second direction. 
     The droplet ejection method may set a time to start ejecting the second droplet from the second nozzle earlier than a time to start ejecting the first droplet from the first nozzle when a center of an opening of the second nozzle is arranged further in the first direction than a center of an opening of the first nozzle. 
     The droplet ejection method may set a time to eject the second droplet from the second nozzle longer than a time to eject the first droplet from the first nozzle when an opening of the second nozzle is smaller than an opening of the first nozzle. 
     The droplet ejection method may set a time to start ejecting the second droplet from the second nozzle after an ending time of ejecting the first droplet from the first nozzle when a center of an opening of the second nozzle is arranged further in the second direction than a center of an opening of the first nozzle. 
     By using an embodiment of the present disclosure, it is possible to eject a droplet to an object which is stable at a predetermined position. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a schematic view of a droplet ejection device according to an embodiment of the present disclosure. 
         FIG. 2A  is a plan view of a droplet ejection unit of an opening of a nozzle according to an embodiment of the present disclosure. 
         FIG. 2B  is an enlarged view of an opening of a nozzle according to an embodiment of the present disclosure. 
         FIG. 3  is a flow diagram of a droplet ejection method according to an embodiment of the present disclosure. 
         FIG. 4A  is an enlarged view of an opening in a nozzle according to an embodiment of the present disclosure. 
         FIG. 4B  is an enlarged view of an opening in a nozzle according to an embodiment of the present disclosure. 
         FIG. 4C  is an enlarged view of an opening in a nozzle according to an embodiment of the present disclosure. 
         FIG. 5  is a schematic view showing a relationship between an ejection time and a voltage in a droplet ejection method according to an embodiment of the present disclosure. 
         FIG. 6A  is an enlarged view of an opening in a nozzle according to an embodiment of the present disclosure. 
         FIG. 6B  is an enlarged view of an opening in a nozzle according to an embodiment of the present disclosure. 
         FIG. 7  is a schematic view showing a relationship between an ejection time and a voltage in a droplet ejection method according to an embodiment of the present disclosure. 
         FIG. 8A  is an enlarged view of an opening in a nozzle according to an embodiment of the present disclosure. 
         FIG. 8B  is an enlarged view of an opening in a nozzle according to an embodiment of the present disclosure. 
         FIG. 9  is a schematic view showing a relationship between an ejection time and a voltage of a droplet ejection method according to an embodiment of the present disclosure. 
         FIG. 10  is a top view of a pattern formed by a droplet ejection method according to an embodiment of the present disclosure. 
         FIG. 11  is a schematic view of a droplet ejection device according to an embodiment of the present disclosure. 
         FIG. 12  is a schematic view of a droplet ejection device according to an embodiment of the present disclosure. 
         FIG. 13  is a top view of a pattern formed without correcting a droplet ejection condition. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, embodiments of the present disclosure disclosed in the present application will be described with reference to the drawings. However, the present disclosure can be implemented in various forms without departing from the gist thereof and should not be construed as being limited to the description of the embodiments exemplified below. 
     In the drawings referred to in the present embodiments, the same portions or portions having similar functions are denoted by the same symbols or similar symbols (symbols each formed simply by adding A, B, etc. to the end of a number), and a repetitive description thereof may be omitted. In addition, the dimensional ratio in the drawings may be different from the actual ratio for convenience of description, or a part of a configuration may be omitted from the drawings. 
     Furthermore, in the detailed description of the present disclosure, in defining the positional relationship between one component and another, the terms “above” and “below” include not only the case of being positioned directly above or below one component, but also the case of interposing another component therebetween, unless otherwise specified. 
     It may not be possible to eject at a predetermined position using the electrostatic ejection-type ink jet head depending on the shape of the tip of a nozzle. 
     Therefore, one object of the present disclosure is to eject a droplet to an object which is stable at a predetermined position. 
     First Embodiment 
     1-1. Configuration of Droplet Ejection Device  100   
       FIG. 1  is a schematic view of a droplet ejection device  100  according to an embodiment of the present disclosure. 
     The droplet ejection device  100  includes a controller  110 , a memory device  115 , a power supply  120 , a drive  130 , a droplet ejection unit  140 , an inspection unit  150 , and an object holding unit  160 . 
     The controller  110  includes a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or other calculation processing circuits. The controller  110  controls ejection processing of the droplet ejection unit  140  by using a pre-set droplet ejection program. 
     The memory device  115  has a function as a database for storing a droplet ejecting program and various types of data used in the droplet ejecting program. A memory, an HDD (Hard Disk Drive), an SSD (Solid State Drive), or other memory elements are used for the memory device  115 . 
     The power supply  120  is connected to the controller  110 , the drive  130 , and the droplet ejection unit  140 . The power supply  120  applies a voltage to the droplet ejection unit  140  based on a signal input from the controller  110 . In this example, the power supply  120  applies a pulsed voltage to the droplet ejection unit  140  in a fixed period. The voltage is not limited to the pulse voltage, and a constant voltage may be applied at all times. 
     The drive  130  is composed of drive members such as a motor, a belt, and a gear. The drive  130  moves the droplet ejection unit  140  (more specifically, a nozzle  141  to be described later) in one direction (in this example, first direction D 1 ) relative to an object  200  based on an instruction from the controller  110 . 
     The droplet ejection unit  140  ejects a droplet  147  to the object  200 . In this example, the droplet  147  is ejected from a perpendicular direction D 3  to the object  200 . The droplet ejection unit  140  includes a nozzle  141  and an ink tank (not shown). An electrostatic ejection-type ink jet nozzle is used for the nozzle  141 . Therefore, it can be said that the droplet ejection unit  140  is an electrostatic ejection-type ink jet head. 
       FIG. 2A  is a plan view of the droplet ejection unit  140 .  FIG. 2B  is an enlarged view of the nozzle  141 . In this example, the droplet ejection unit  140  includes a plurality of nozzles  141  (nozzles  141 - 1 ,  141 - 2 ,  141 - 3 ,  141 - 4 , and  141 - 5 ) and a structure  142 . The nozzle  141 - 1 , the nozzle  141 - 2 , the nozzle  141 - 3 , the nozzle  141 - 4 , and the nozzle  141 - 5  are arranged at equal intervals in the structure  142 , respectively. The nozzle  141  may be welded to the structure  142  or may be fixed by an adhesive. The nozzle  141 - 1 , the nozzle  141 - 2 , the nozzle  141 - 3 , the nozzle  141 - 4 , and the nozzle  141 - 5  will be described as the nozzle  141  unless otherwise limited. 
     Returning to  FIG. 1 , the structure  142  extends in a second direction D 2  intersecting (in this example, orthogonal to) the direction (the first direction D 1 ) in which the droplet ejection unit  140  is scanned. Therefore, it can be said that the plurality of nozzles  141  is aligned in the second direction D 2 . The structure  142  is provided in a plate shape in this example. The structure  142  includes a flow path for each nozzle  141  so that a liquid stored in the ink tank is ejected as the droplet  147  from each nozzle  141 . The structure  142  may be appropriately formed into an optimum shape according to the application. As shown in  FIG. 2A  and  FIG. 2B , it is desirable that an inner diameter of an opening  141   a  at the tip of the nozzle  141  is several hundred nm or more and 20 μm or less, preferably 1 μm or more and 15 μm or less, more preferably 5 μm or more and 12 μm or less. 
     The nozzle  141  has a glass tube, and an electrode  145  is provided inside the glass tube. In this example, a fine wire formed of tungsten is used as the electrode  145 . The electrode  145  is not limited to tungsten, and nickel, molybdenum, titanium, gold, silver, copper, platinum, or the like may be provided for the electrode  145 . 
     The electrode  145  of the nozzle  141  is electrically connected to the power supply  120 . The liquid (ink) stored in the ink tank is ejected from the opening  141   a  of the nozzle  141  as the droplet  147  by a voltage (in this example, 1000 V) applied from the power supply  120  to the inside of the nozzle  141  and the electrode  145 . The shape of the droplet (pattern) formed by the droplet  147  is controlled by the voltage applied from the power supply  120 . 
     A material having a high viscosity is used for the droplet  147 . Specifically, an ink for forming a pattern containing a pigment is used for the droplet  147 . The droplet  147  may include a conductive particle. The droplet ejection unit  140  is provided with an electrostatic ejection-type ink jet, and the ejection amount is controlled by a voltage applied from the power supply  120 . It is desirable that the ejection amount of the droplet  147  is 0.1 fl or more and 100 pl or less. The pattern size formed in this case is 100 nm or more and 500 μm or less. 
     The inspection unit  150  inspects the shapes of the opening  141   a  of each nozzle  141 . In this case, an optical microscope, which includes an optical element such as a lens, a display device such as a display and an imaging element, is used for the inspection unit  150 . The nozzle  141  to be inspected is arranged to face the optical microscope. The inspection unit  150  captures an image of the nozzle  141  based on an image of the nozzle  141  having an opening formed in accordance with a design value previously stored in the memory device  115 . Information of the opening  141   a  in the nozzle  141  inspected by the inspection unit  150  is stored in the memory device  115 . 
     The object holding unit  160  has a function of holding the object  200 . In this example, a stage is used as the object holding unit  160 . A mechanism by which the object holding unit  160  holds the object  200  is not particularly limited, and a general holding mechanism is used. In this example, the object  200  is vacuum adsorbed on the object holding portion  160 . Furthermore, the object holding unit  160  is not limited thereto and may hold the object  200  using a fixture. 
     The object  200  is a member on which the droplet  147  is ejected. In this example, a glass plate is used as the object  200 . The object  200  is not limited to a glass plate. For example, the object  200  may be a metal plate or an organic resin member. A metal wiring or an organic member may be formed on the object  200 . A counter electrode for the droplet ejection is provided on the object  200 . 
     In the present embodiment, the controller  110  includes an acquisition unit  111  and a setting unit  113  as an internal configuration of software. 
     The acquisition unit  111  acquires information of the nozzle  141 . In this example, information of the opening  141   a  at the tip of the nozzle  141  inspected by the inspection unit  150  is stored in the memory device  115 . For this reason, the acquisition unit  111  acquires the information of the opening  141   a  at the tip of the nozzle  141  from the memory device  115 . In this case, the acquisition unit  111  acquires information by receiving information of the opening  141   a  at the tip of the nozzle  141 . 
     The setting unit  113  sets an ejection condition of the droplet  147  based on the information of the nozzle  141  acquired by the acquisition unit  111 . In this example, the setting unit  113  corrects the pre-set ejection condition based on information such as a position of a center of the opening  141   a  in the nozzle  141  to be described later, the inner diameter of the opening  141   a , and the like, and newly sets time to start ejecting, a time to end ejecting, and a voltage to be applied to the electrode  145  at the respective ejection positions of the object  200 . 
     1-2. Droplet Ejection Method 
     Next, a droplet ejection method will be described with reference to the drawings.  FIG. 3  is a flow diagram showing a droplet ejection method according to the present embodiment. Hereinafter, each case with a different opening is described. 
     1-2-1. Droplet Ejection Method in the Case where the Inner Diameter of the Opening is Different 
     Hereinafter, a droplet ejection method is explained in the case where the inner diameter of the opening at the tip of the nozzle  141  is different. First, the acquisition unit  111  acquires the information of the opening  141   a  at the tip of the nozzle  141  (S 110 ). The information of the opening  141   a  is inspected by the inspection unit  150  in advance. In this example, the nozzle is arranged at a predetermined position set for inspection. The tip of the nozzle  141  to be inspected is arranged facing the inspection unit  150  with a predetermined distance. The inspection unit  150  captures the opening  141   a  of each nozzle  141  based on the image of the nozzle  141  having the opening  141   a  formed according to the design value previously stored in the memory device  115 . In this case, the image is captured so that a central portion of the nozzle  141  is at the center of the image. Therefore, in the case of the nozzle  141  having the opening  141   a  formed according to the design value, the center of the nozzle  141  overlaps the center of the opening  141   a . The information of the opening  141   a  in the inspected nozzle  141  is stored in the memory device  115 . 
       FIG. 4A ,  FIG. 4B  and  FIG. 4C  are examples of the information of the inspected opening  141   a .  FIG. 4A  is an enlarged view of the nozzle  141 A. In  FIG. 4A , an inner diameter d 141 Aa of an opening  141 Aa is the same as a design value d 141 Za.  FIG. 4B  is an enlarged view of a nozzle  141 B. In  FIG. 4B , an inner diameter d 141 Ba of the opening  141 Ba is larger than the design value d 141 Za.  FIG. 4C  is an enlarged view of a nozzle  141 C. In  FIG. 4C , an inner diameter d 141 Ca of an opening  141 Ca is smaller than the design value d 141 Za. 
     Next, the setting unit  113  compares the inner diameter of the opening  141   a  acquired by the acquisition unit  111  with the design value (S 120 ). In this case, the setting unit  113  calculates how much the opening  141  a deviates from the design value. In this case, imaging processing may be appropriately performed using the image captured by the inspection unit  150 . 
     Next, the setting unit  113  sets an ejection condition of the droplet  147  from the nozzle  141  by using the result calculated from the design value and the inner diameter of the opening  141   a , which is inspected in the above description (S 130 ). In this example, the setting unit  113  corrects the ejection condition of the droplet from the opening  141   a  formed with the pre-set design value, and newly sets the time to start ejecting the droplet  147 , time to end ejecting the droplet  147 , and the voltage to be applied to the electrode  145  at the respective ejection positions of the object  200 . 
       FIG. 5  is a schematic view showing a relationship between a time to eject the droplet  147  and the voltage applied to the electrode  145  in the present embodiment. For example, the inner diameter of an opening  141 - 1   a  of the nozzle  141 - 1  among the nozzles  141  is larger than a nozzle  141 Z formed with the design value (corresponding to the nozzle  141 B), and the inner diameter of an opening  141 - 2   a  in the nozzle  141 - 2  is smaller than the nozzle  141 Z formed with the design value (corresponding to the nozzle  141 C). In this case, as shown in  FIG. 5 , the setting unit  113  sets the ejection condition so that the time to eject the droplet from the nozzle  141 - 2  is longer than the time to eject the droplet from the nozzle  141 - 1  (S 130 ). In this case, the setting unit  113  may set the voltage applied to the electrode  145  of the nozzle  141 - 2  at the time of ejecting larger than the voltage applied to the electrode  145  of the nozzle  141 - 1  at the time of ejecting. The setting unit  113  sets the ejection condition for the other nozzles  141  in the same manner. 
     Finally, the nozzles  141  of the droplet ejection unit  140  are moved by the controller  110  and the drive  130  onto the object  200 , which is prepared in the droplet ejection device  100 . The droplet ejection unit  140  ejects a certain amount of droplets from each nozzle  141  based on the ejection condition set by the setting unit  113  (S 140 ). As described above, even when the inner diameter of the opening  141   a  is different, the ejection condition is corrected for each nozzle  141  so as to achieve the optimum ejection condition, and the same amount of droplets can be ejected. 
     1-2-2. Droplet Ejection Method when the Opening Deviates in the Scanning Direction 
     Next, a droplet ejection method is described in which the inner diameter of the opening  141   a  is the same but the opening  141   a  is deviated in the first direction D 1 , which is the moving direction of the droplet ejection unit  140 . Descriptions similar to those described above are omitted as appropriate. 
     First, the acquisition unit  111  acquires the information of the opening  141   a  of the nozzle  141  (S 110 ).  FIG. 6A  and  FIG. 6B  are examples of location information of the center in the inspected opening  141   a .  FIG. 6A  is an enlarged view of the nozzle  141 D. In  FIG. 6A , a center position C 141 Da of an opening  141 Da is deviated by Δ 141  Da in the first direction D 1  from a center C 141 Za of the design value.  FIG. 6B  is an enlarged view of a nozzle  141 E. In  FIG. 6B , a center C 141 Ea of an opening  141 Ea is deviated by Δ 141 Ea in a direction opposite to the first direction D 1  from the center position C 141 Za of the design value. 
     Next, the setting unit  113  compares the center position of the acquired opening  141   a  with the center position of the design value. In this case, the setting unit  113  calculates how much the center of the inspected opening  141   a  deviated from the center of the design value. 
     Next, the setting unit  113  sets the ejection condition of the droplet  147  from the nozzle  141  by using the result of the compared calculation from the location information of the center in the design value and the location information of the center in the opening  141   a , which is inspected in the above description (S 130 ). In this example, the setting unit  113  corrects the ejection condition in the opening  141  a formed with the pre-set design value, and newly sets the time to start ejecting and the time to end ejecting at the respective ejection positions of the object  200 . 
       FIG. 7  is a schematic view showing a relationship between a time to eject and a voltage in the present embodiment. For example, it is assumed that the center of the opening  141 - 1   a  in the nozzle  141 - 1  among the nozzles  141  is misaligned further in the direction opposite to the first direction D 1  than the center of the opening in the nozzle  141 Z formed with the design value (corresponding to the nozzle  141 E), and that the center of the opening  141 - 2   a  of the nozzle  141 - 2  is misaligned further in the first direction D 1  than the center of the opening of the nozzle  141 Z formed with the design value (corresponding to a nozzle  141 D). In this case, as shown in  FIG. 7 , the setting unit  113  sets the ejection condition so that a time to start ejecting from the nozzle  141 - 2  is earlier than a time to start ejecting from the nozzle  141 - 1  (S 130 ). In this case, the setting unit  113  may keep the voltage applied to the electrode  145  of the nozzle  141 - 2  and the voltage applied to the electrode  145  of the nozzle  141 - 1  constant at the time of ejection. The setting unit  113  may set the variation amount in the position of the droplet ejection unit  140 . Based on this information, the drive  130  can displace the position of the droplet ejection unit  140 . The setting unit  113  may appropriately set the ejection condition for the other nozzles  141  in the same manner. In this example, in  FIG. 7 , the time of ejecting from each nozzle  141  partially overlaps. 
     Finally, the droplet ejection unit  140  ejects a certain amount of droplets from each nozzle  141  based on the ejection condition set by the setting unit  113  (S 140 ). Thereby, even when the center of the opening  141   a  is shifted in the direction in which the droplet ejection unit  140  moves or in the opposite direction, a droplet at a predetermined position can be ejected. 
     In  FIG. 7 , although the time of ejecting from each nozzle  141  partially overlaps, it may not necessarily overlap. 
     1-2-3. Droplet Ejection Method when the Opening Deviates in the Direction Intersecting the Scanning Direction 
     Next, a droplet ejection method is described in which the inner diameter of the opening  141   a  is the same but the center of the opening  141   a  is deviated in the direction (second direction D 2 ) intersecting the moving direction (first direction D 1 ) of the droplet ejection unit  140 . Descriptions similar to those described above are omitted as appropriate. 
     First, the acquisition unit  111  acquires the information of the opening  141   a  of the nozzle  141  (S 110 ).  FIG. 8A  and  FIG. 8B  are examples of location information of the center of the inspected opening  141   a .  FIG. 8A  is an enlarged view of a nozzle  141 F. In  FIG. 8A , a center position C 141 Fa of an opening  141 Fa is deviated further in the direction opposite to the second direction D 2  than the center position C 141 Za of the design value.  FIG. 8B  is an enlarged view of a nozzle  141 G. In  FIG. 8B , a center C 141 Ga of an opening  141 Ga is deviated further in the second direction D 2  than the center C 141 Za of the design value. 
     Next, the setting unit  113  compares the center position of the acquired opening  141   a  with the center position of the design value. In this case, the setting unit  113  calculates how much the center of the inspected opening  141   a  is deviated from the center of the design value. 
     Next, the setting unit  113  sets the ejection condition of the nozzle  141  by using the result calculated from the location information of the center of the design value and the location information of the center in the opening  141   a , which is inspected in the above description (S 130 ). In this example, the setting unit  113  corrects the ejection condition in the opening  141   a  formed with the pre-set design value and newly sets the time to start ejecting and the time to end ejecting the droplet  147  at the respective ejection positions of the object  200 . 
       FIG. 9  is a schematic view showing the relationship between the time of ejecting the droplet  147  and the voltage applied to the electrode  145  in the present embodiment. For example, it is assumed that the center of the opening  141 - 1   a  at the tip of the nozzle  141 - 1  among the nozzles  141  is arranged further in the second direction D 2  than the center C 141 Za of the opening at the tip of the nozzle  141 Z formed with the design value (corresponding to the nozzle  141 G), and the center of the opening  141 - 2   a  of the nozzle  141 - 2  is arranged further in the direction opposite to the second direction D 2  than the center C 141 Za at the tip of the nozzle  141 Z formed with the design value (corresponding to the nozzle  141 F). In this case, as shown in  FIG. 9 , the setting unit  113  sets the ejection condition so that a time to start ejecting from the nozzle  141 - 2  is later than a time to end ejecting from the nozzle  141 - 1  (S 130 ). In addition, in this case, the setting unit  113  sets a variation amount of the position of the droplet ejection unit  140 . Based on this information the drive  130  can shift the position of the droplet ejection unit  140 . Specifically, the position of the nozzle  141  is moved by Δ 141 Ga by the drive  130  before the droplet ejection from the nozzle  141 - 1 . Next, after the ejection from the nozzle  141 - 1 , the ejection condition is set so that the position of the nozzle  141  is deviated by the sum of Δ 141 Fa and Δ 141 Ga by the drive  130 , and the nozzle  141 - 2  ejects a droplet. In this case, the setting unit  113  may keep the voltage applied to the electrode  145  of the nozzle  141 - 2  and the voltage applied to the electrode  145  of the nozzle  141 - 1  constant at the time of ejection. The setting unit  113  set the ejection condition for the other nozzles  141  in the same manner. 
     Finally, the droplet ejection unit  140  ejects a certain amount of droplets from each nozzle  141  based on the ejection condition set by the setting unit  113  (S 140 ). Thereby, even when the center of the opening  141   a  is deviated in the direction intersecting the scanning direction or in the direction opposite to the scanning direction, a droplet at a predetermined position can be ejected. 
     1-3. Pattern Shape After Ejection 
     A plan view of the object  200  after the droplet ejection is shown in  FIG. 10 . A plan view of the object  200  after the droplet ejection in the case where the droplet ejection condition is not corrected is shown in  FIG. 13  as a comparative example. As shown in  FIG. 13 , in the case where the droplet ejection condition is not corrected, the ejection position of the droplet may be deviated, or the ejection amount of the droplet may be insufficient. On the other hand, as shown in  FIG. 10 , even when the inner diameter and the center position of the opening  141   a  are different from the design value, by using the droplet ejection device and the droplet ejection method according to the present embodiment, the ejection condition is corrected so as to be optimal, and therefore, a specified amounts of droplets can be ejected at a predetermined position. 
     Second Embodiment 
     In the present embodiment, a droplet ejection device different from the first embodiment will be described. Specifically, an example is described in which a new droplet ejection unit is provided in addition to the droplet ejection unit  140 . For the sake of explanation, a description of members thereof will be omitted as appropriate. 
       FIG. 11  is a schematic view of a droplet ejection device  100 A according to an embodiment of the present disclosure. The droplet ejection device  100 A includes a second droplet ejection unit  170  in addition to the controller  110 , the memory device  115 , the power supply  120 , the drive  130 , the droplet ejection unit  140 , the inspection unit  150 , and the object holding unit  160 . 
     The second droplet ejection unit  170  is arranged in the opposite direction side to the first direction D 1  with respect to the droplet ejection unit  140  (that is, the rear of the droplet ejection unit  140 ). As shown in  FIG. 11 , the second droplet ejection unit  170  includes a single nozzle  171  in this example. Specifically, the second droplet ejection unit  170  includes the nozzle  171 , a structure  172 , and an electrode  175 . The second droplet ejection unit  170  may have the same form as the droplet ejection unit  140 . The second droplet ejection unit  170  ejects a droplet  177  based on the information of the droplet ejection unit  140  inspected by the inspection unit  150  (specifically, the information of the nozzle  141 ). 
     In this example, in the case where the opening of one nozzle  141  among the plurality of nozzles  141  is closed, the droplet  147  is not ejected from the nozzle  141 . Therefore, after ejection of the droplet  147  by the droplet ejection unit  140  is completed, the second droplet ejection unit  170  can eject the droplet  177  to a position where the droplet should be ejected by the nozzle  141  where the opening  141   a  has closed. 
     By using the present embodiment, it is possible to stably eject a droplet at a position where ejection failure occurs. 
     Third Embodiment 
     In this embodiment, a droplet ejection device different from the first embodiment and the second embodiment will be described. Specifically, an example is described in which the droplet ejection device does not include an acquisition unit and a setting unit, and an inspection device includes an acquisition unit and a setting unit together with an inspection unit. 
       FIG. 12  is a schematic view of a droplet ejection system  10  including a droplet ejection device  100 B and an inspection device  300  according to an embodiment of the present disclosure. The droplet ejection device  100 B includes the controller  110 , the memory device  115 , the power supply  120 , the drive  130 , the droplet ejection unit  140 , and the object holding unit  160 . 
     The inspection device  300  includes a controller  310 , a memory device  315 , and an inspection unit  350 . The controller  310  includes an acquisition unit  311  and a setting unit  313 . The acquisition unit  311  has the same function as the acquisition unit  111 . The setting unit  313  has the same function as the setting unit  113 . 
     In the case of the present embodiment, unlike the first embodiment, in the inspection device, the droplet ejection condition can be corrected from a reference value. The information including the droplet ejection condition newly set by correcting thereof is received by the memory device  115  of the droplet ejection device  100 B via a network NW. The information including the droplet ejection condition may be stored in a storage medium and connected to the droplet ejection device  100 B. By using the present embodiment, the load of the controller  110  on the droplet ejection device  100 B can be reduced, and the droplet ejection system can stably eject a droplet at a predetermined position as a whole. 
     Modifications 
     Within the spirit of the present disclosure, it is understood that various modifications and changes can be made by those skilled in the art and that these modifications and changes also fall within the scope of the present disclosure. For example, the addition, deletion, or design change of components, or the addition, omission, or condition change of processes as appropriate by those skilled in the art based on each embodiment are also included in the scope of the present disclosure as long as they are provided with the gist of the present disclosure. 
     In the first embodiment of the present disclosure, although an optical microscope is used as the inspection unit  150 , the present disclosure is not limited thereto. For example, a laser microscope, a scanning electron microscope, or the like may be used as the inspection unit  150 . The inspection unit  150  may have a form as an imaging device (camera) instead of a form as a microscope. 
     In the first embodiment of the present disclosure, although an example of inspecting the shape of the opening  141   a  of the nozzle  141  was described, the present disclosure is not limited thereto. For example, the orientation of the tip in the nozzle  141  may be inspected, or the shape of the sides in the nozzle  141  may be inspected. 
     In the first embodiment of the present disclosure, although an example in which the inspection unit  150  is provided inside the droplet ejection device  100  was described, the present disclosure is not limited thereto. The inspection unit  150  may be provided as a device separate from the droplet ejection device. In this case, the information of the opening  141  a in the nozzle  141  may be stored in the memory device  115  from the outside of the droplet ejection device  100 . 
     In the first embodiment of the present disclosure, the information of the opening  141   a  of the nozzle  141  may be stored in the inspection unit  150 . The acquisition unit  111  may be acquired from the inspection unit  150  via a network. 
     The information of the opening  141   a  in the nozzle  141  may be stored in an external memory device such as an HDD or an SSD connected thereto, or in a memory device of an external server, in addition to the inspection unit  150 . 
     In the first embodiment of the present disclosure, although an example was shown in which the droplet ejection unit  140  is moved on the object  200  by the drive  130 , the present disclosure is not limited thereto. For example, in the droplet ejection device, the drive  130  may move the object  200 . In this case, the droplet ejection unit  140  may be fixed at the same position. 
     In the first embodiment, the object  200  is not limited to a substrate with a flat surface. The object  200  may be a wiring substrate in which wirings are stacked. 
     In the first embodiment of the present disclosure, although an example was shown of inspecting the opening of the nozzle as the information of the droplet ejection unit, the present disclosure is not limited thereto. For example, the inspection unit  150  may inspect the shape of the droplet when the droplet is ejected to the test substrate in advance before the droplet is ejected to the object  200 . In this case, the inspection unit  150  can inspect the size and the amount of misalignment of the droplet when the droplet is ejected at a predetermined position. The information of the droplet ejection unit  140  may be information associated with the shape of the droplet  147 . The acquisition unit  111  acquires this ejection result, and the setting unit  113  can set the ejection condition of the droplet from each nozzle  141 . 
     A new second inspection unit different from the inspection unit  150  may be provided. The second inspection unit may be used integrally with the droplet ejection unit  140 . After the droplet ejection unit  140  ejects the droplet  147  to the object  200 , the second inspection unit may inspect the shape of the droplet ejected from the nozzle  141 . The second inspection unit may have an imaging element and may capture an image of the ejection result. The imaging result may be determined by the controller  110 . If it is determined that there is an ejection failure, the controller  110  may control to eject the droplet  147  again to the area where the failure occurred. As a result, it is possible to suppress the droplet ejection failure. After the determination of the ejection failure, the second droplet ejection unit  170  may eject a droplet to the area where the ejection failure occurred. 
     In the first embodiment of the present disclosure, although an example was shown in which the second droplet ejection unit ejects a droplet based on the information of the droplet ejection unit  140 , the present disclosure is not limited thereto. As described above, the droplet ejection unit  140  may eject the second droplet based on the first droplet ejection result by the droplet ejection unit  140 . 
     An inspection unit (third inspection unit) different from the inspection unit  150  and the second inspection unit may be provided. The third inspection unit may inspect the surface condition of the object  200 , the viscosity of the liquid, and the like. The acquisition unit  111  can acquire this information. The setting unit  113  corrects the ejection condition by comparing the viscosity of the liquid to be used as a reference and the information of the surface condition of the object based on the acquired information. As a result, a new droplet ejection condition can be set.