WO2023188838A1 - Appareil d'impression et procédé d'impression - Google Patents

Appareil d'impression et procédé d'impression Download PDF

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Publication number
WO2023188838A1
WO2023188838A1 PCT/JP2023/004023 JP2023004023W WO2023188838A1 WO 2023188838 A1 WO2023188838 A1 WO 2023188838A1 JP 2023004023 W JP2023004023 W JP 2023004023W WO 2023188838 A1 WO2023188838 A1 WO 2023188838A1
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WIPO (PCT)
Prior art keywords
ink
printing
nozzles
control device
ejection amount
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PCT/JP2023/004023
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English (en)
Japanese (ja)
Inventor
修平 中谷
幸也 臼井
正照 土居
努 川西
彰一 田中
Original Assignee
パナソニックＩｐマネジメント株式会社
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Publication of WO2023188838A1 publication Critical patent/WO2023188838A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/26—Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/02—Ink jet characterised by the jet generation process generating a continuous ink jet
    • B41J2/03—Ink jet characterised by the jet generation process generating a continuous ink jet by pressure
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • H10K71/10—Deposition of organic active material
    • H10K71/12—Deposition of organic active material using liquid deposition, e.g. spin coating
    • H10K71/13—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing

Definitions

  • An object of the present disclosure is to provide a printing device and a printing method that can suppress printing unevenness.
  • FIG. 1 is a schematic perspective view showing the overall configuration of a printing apparatus 1 according to an embodiment.
  • FIG. 2 is a block diagram of the printing device 1 according to the embodiment. This disclosure will be described using a Cartesian coordinate system (X, Y, Z). As shown by arrows in FIG. 1, the Z-axis direction is the height direction of the printing device 1, the Y-axis direction is the width direction of the printing device 1, and the X-axis direction is the depth direction of the printing device 1.
  • the storage unit 151 is, for example, a large capacity storage device such as an HDD.
  • the storage unit 151 stores a control program for controlling the inkjet stage 20, the inkjet head 30, the droplet observation device 40, and the landed droplet observation device 50, characteristic data of the inkjet head 30 (described later), and a control table. 700 (described later) etc. are stored.
  • the input unit 152 is an input device for inputting instructions to the printing apparatus 1, and is, for example, a keyboard or a touch panel.
  • the display section 153 is a display. The display unit 153 displays the observation results obtained by the droplet observation device 40 and the landed droplet observation device 50.
  • the CPU 154 controls the inkjet stage 20, the inkjet head 30, the droplet observation device 40, and the landed droplet based on the control program stored in the storage unit 151 and instructions input via the input unit 152.
  • the observation device 50 is controlled.
  • the plurality of piezoelectric elements 350 are attached to the surface of the diaphragm 340 on the opposite side from the liquid chamber 321.
  • the piezoelectric elements 350 correspond to the liquid chambers 321 on a one-to-one basis, and are arranged in the same number as the liquid chambers 321.
  • FIG. 3 shows three adjacent ink ejection mechanisms.
  • the piezoelectric element 350, the liquid chamber 321, and the nozzle 331 are arranged in a one-to-one correspondence.
  • the ink ejection mechanisms are arranged in one row, but the invention is not limited to this, and they may be arranged in multiple rows.
  • the distances between adjacent ink ejection mechanisms are equal, but the distance between adjacent ink ejection mechanisms is not limited to this, and the distances between adjacent ink ejection mechanisms may be different.
  • the plurality of ink ejection mechanisms are each independently driven by being individually supplied with voltage signals to be described later.
  • the piezoelectric element 350 expands and contracts in the Z-axis direction when a voltage signal is applied. Accordingly, a portion of the diaphragm 340 corresponding to the upper wall of each liquid chamber 321 is deformed so as to be convex toward the inside and outside of the liquid chamber 321. That is, the diaphragm 340 is deformed so that the volume of the liquid chamber 321 is reduced or restored.
  • the liquid chamber 321 is pressurized and the ink in the liquid chamber 321 is ejected from the nozzle 331.
  • the voltage signal S1 has a first pulse waveform W1 and a second pulse waveform W2.
  • the first pulse waveform W1 and the second pulse waveform W2 are, for example, rectangular pulse waveforms having a frequency of several hundred Hz to several tens of kHz and a time width of approximately several tens of ⁇ s.
  • the diaphragm 340 deforms so that the volume of the liquid chamber 321 increases. Thereafter, as the voltage value changes to the third potential Ec, the diaphragm 340 deforms so that the volume of the liquid chamber 321 decreases. As a result, the ink in the liquid chamber 321 is pressurized, and the ink is ejected through the nozzle 331.
  • FIG. 4 shows that the voltage signal is composed of a rectangular pulse waveform
  • the voltage signal may have a step-shaped pulse waveform and a curved-shaped waveform.
  • the flight speed is too fast, secondary droplets called satellites are likely to occur.
  • the flying speed is too slow, the droplet is likely to be affected by air resistance while flying, and the accuracy of the landing position of the droplet will decrease.
  • the droplet observation device 40 it is possible to check whether the flying speed of the droplets ejected from the inkjet head 30 is within an appropriate speed range.
  • the droplet observation device 40 includes a droplet observation camera 402 and a control section 410 (see FIGS. 1 and 2).
  • the tip of the droplet observation camera 402 is directed toward the head section 301 of the inkjet head 30.
  • the droplet observation camera 402 is, for example, a CCD (Charge Coupled Device) camera, and is connected to the control unit 410 via a cable 404.
  • CCD Charge Coupled Device
  • the control unit 410 causes the droplet observation camera 402 to perform an imaging operation during printing, and acquires still image data and moving image data of the droplet. Note that the still image data and moving image data of the droplet are output to the control device 15 and stored in the storage section 151, and are also displayed on the display section 153.
  • the droplet observation device 40 can also measure the volume of droplets discharged from each nozzle 331.
  • the droplet observation device 40 can estimate the volume based on the diameter of a two-dimensionally observed droplet, for example, assuming that the flying droplet is spherical.
  • the photographing unit 501 has a camera that photographs droplets that have landed on the printing target.
  • the control unit 510 is connected to the CPU 154, and performs imaging control of the imaging unit 501 under the control of the CPU 154.
  • FIG. 5 is a diagram showing an example of actual measurement data of droplet volume.
  • the droplet volume when the ejection voltages Ed1 and Ed2 are applied to each nozzle 331 is stored in the storage unit 151.
  • FIG. 5 shows the volume of each droplet when two ejection voltages Ed1 and Ed2 are applied, the volume of each droplet when three or more ejection voltages are applied may be measured.
  • the control device 15 derives the relationship between the droplet volume and the ejection voltage of the voltage signal for each nozzle 331 based on the actual measurement data of the droplet volume, for example, by the least squares method.
  • the control device 15 derives the relationship between the volume of the droplet and the ejection voltage of the voltage signal based on the droplet volume data, and adjusts the ejection voltage according to the desired droplet volume based on the derivation result. Adjust. Thereby, the volume of droplets discharged from each nozzle 331 can be adjusted for each nozzle 331. For example, if printing unevenness is confirmed on the printing target, the control device 15 can adjust the droplet volume for each nozzle 331 based on the droplet volume data.
  • control device 15 can suppress variations in the volume of the plurality of droplets ejected from the plurality of nozzles 331 to about 5% or less. .
  • an ink application area 521 is formed by a line-shaped bank (hereinafter referred to as a "line bank").
  • the coating target area 521 formed by the line bank is referred to as a "line area 521.”
  • the plurality of line regions 521 are arranged along the X-axis direction. Line area 521 extends from one end of display panel 520 to the other end in the Y-axis direction.
  • an ink application area 601 is formed by a bank divided into pixels (hereinafter referred to as a "pixel bank").
  • the coating target area 601 formed by the pixel bank is referred to as a "cell area 601.”
  • the cell area 601 has a shorter longitudinal dimension than the line area 521.
  • three cell regions 601 are arranged along the Y-axis direction, and a set of the three cell regions 601 is arranged along the X-axis direction.
  • One or more coating target positions are arranged in the coating target areas 521 and 601. For example, in FIG. 7, 15 coating target positions are arranged in line area 521 in the Y-axis direction. In FIG. 8, three coating target positions are arranged in the cell area 601 in a row in the Y-axis direction.
  • M is an integer of 2 or more
  • the standard deviation of the droplet volume in all M nozzles 331 is ⁇ mean
  • the droplet volume by each of the M nozzles 331 is When the standard deviations are ⁇ 1 , ⁇ 2 , ⁇ 3 , ..., ⁇ M , the following formula (1) holds true.
  • ⁇ 1 ⁇ mean /M 1/2 ...(2)
  • ⁇ mean of the droplet volume of all three nozzles 331 n% (n is 10 or less)
  • ⁇ 1 of the droplet volume ejected from each nozzle 331 is n/3 1/2 (%).
  • ⁇ 1 will be approximately 1.7%.
  • ⁇ mean of the droplet volumes of all 15 nozzles 331 is n%
  • ⁇ 1 is n/15 1/2 (%). Further, if n is 3%, ⁇ 1 will be approximately 0.8%.
  • the variation in volume of the plurality of droplets ejected from the 15 nozzles 331 is about 3%. Furthermore, since a large number of droplets are applied over a relatively wide area, variations in the volume of the 15 droplets are evened out.
  • the inkjet head 30 is arranged so that a plurality of coating target positions arranged in the main scanning direction are assigned to each of the plurality of nozzles 331, and each time a droplet volume is ejected to one nozzle 331 (in the main scanning direction
  • the variation in the values (for each coating target position) is about 1% or less. This variation is also smaller than the variation in the volume of droplets from one nozzle 331 to another. Therefore, when printing and forming a film on the display panel 600 in FIG. 8, there is a variation in the film thickness of the cell region 601 in the X-axis direction compared to a variation in the film thickness of the cell region 601 in the Y-axis direction. becomes smaller. Therefore, streaks may become noticeable along the X-axis direction, which may appear as printing unevenness.
  • the printing apparatus 1 executes droplet volume control, which will be described later, so that the droplet volume for each ejection from the same nozzle 331 is equal to or smaller than the volume of droplets applied from a plurality of nozzles 331.
  • the droplet volume for each ejection is made to vary to the same extent as the variation.
  • the printing apparatus 1 varies the droplet volume for each coating target position so that the droplet volume falls within an allowable range at a plurality of coating target positions lined up in the main scanning direction.
  • the allowable range can be expressed as H ⁇ dH as the lower limit and H+dH as the upper limit, where H is the reference discharge amount and dH is the allowable amount.
  • FIG. 9 is a diagram illustrating the voltage signal S2 according to this embodiment.
  • FIG. 10 is a diagram illustrating the voltage signal S3 according to this embodiment.
  • FIG. 11 is a diagram illustrating a plurality of adjustment signals S11 to S18 used when the printing apparatus 1 generates a voltage signal.
  • FIG. 12 is a diagram illustrating an example of a control table 700 that the printing apparatus 1 refers to when executing droplet volume control.
  • the printing apparatus 1 is configured to eject ink at a reference ejection amount from a plurality of nozzles 331 into a plurality of cells of the same type, that is, to eject ink at a plurality of application target positions on a printing object.
  • control parameters for the nozzle 331 are changed for each coating target position (that is, the number of discharges) arranged in the X-axis direction (main scanning direction).
  • the control parameter is a parameter that correlates with the amount of ink ejected from the nozzle 331 (that is, the volume of the droplet).
  • the control parameter is the above-mentioned ejection voltage as an example.
  • the control device 15 makes the volume of the droplet ejected from the nozzle 331 larger than when applying the voltage signal S1 in FIG. be able to.
  • the voltage signal S2 in FIG. 9 has a first potential Ea1 smaller than the first potential Ea, a second potential Eb1 smaller than the second potential Eb, and a third potential Ec1 larger than the third potential Ec.
  • the voltage signal S2 has a discharge voltage Ed1 (ie, Ec1-Eb1) that is larger than the discharge voltage Ed (ie, Ec-Eb) of the voltage signal S1.
  • the control device 15 can make the volume of the droplet ejected from the nozzle 331 smaller than when applying the voltage signal S1 in FIG. I can do it.
  • the voltage signal S3 in FIG. 10 has a first potential Ea2 larger than the first potential Ea, a second potential Eb2 larger than the second potential Eb, and a third potential Ec2 smaller than the third potential Ec.
  • the voltage signal S3 has an ejection voltage Ed2 (ie, Ec2-Eb2) smaller than the ejection voltage Ed (ie, Ec-Eb) of the voltage signal S1.
  • the control device 15 applies voltage signals having different ejection voltages to the piezoelectric element 350 for each nozzle 331 and the number of times of ejection. For example, the control device 15 generates a voltage signal for application for each nozzle 331 and for each number of ejections based on the reference voltage signal and the plurality of adjustment signals.
  • the reference voltage signal is a voltage signal applied when ink is ejected at a reference ejection amount.
  • This reference voltage signal includes a waveform indicating the discharge voltage Ed.
  • the waveform indicating the discharge voltage Ed differs for each nozzle 331.
  • the magnitude of this ejection voltage Ed is adjusted in order to reduce variations in the amount of ink ejected from one nozzle 331 to a certain extent.
  • control device 15 selects one of the adjustment signals S11 to S18 in FIG. 11, uses the selected voltage signal to perform addition processing or subtraction processing on the reference voltage signal, and applies Generate a voltage signal for In this way, the control device 15 changes the difference value between the reference discharge amount and the discharge amount actually discharged from the nozzle 331 at a plurality of target coating positions.
  • the addition/subtraction signals S11 to S18 are waveform signals with different amplitudes (maximum voltage and minimum voltage), and in FIG. 11, the amplitudes of the addition/subtraction signals S11 to S18 increase in the order of magnitude.
  • These addition/subtraction signals S11 to S18 are stored in the storage section 151, for example.
  • the ejection voltage included in the voltage signal for application differs depending on the selected adjustment signal. Although eight types of adjustment signals are shown in FIG. 11, the number is not limited to eight types.
  • the storage unit 151 stores an adjustment signal that always shows the same voltage value, that is, a signal in which the reference voltage signal does not change even if addition processing and subtraction processing are performed on the reference voltage signal. May be used for volume control.
  • the reference potential Emid of the voltage signal applied to the piezoelectric element 350 does not change regardless of the nozzle 331 and the number of ejections. Therefore, the position of the ink liquid level inside the nozzle 331 is always maintained at a constant position, so that droplets are stably ejected.
  • the printing apparatus 1 executes the droplet volume control described above, it is possible to increase the variation in droplet volume depending on the number of ejections from the same nozzle 331. Therefore, the droplet volumes at the plurality of coating target positions lined up in the X-axis direction vary to the same extent as the droplet volumes at the plurality of coating target positions lined up in the Y-axis direction. As a result, streaks along the X-axis direction are less likely to appear, and printing unevenness is suppressed.
  • the flying speed of the droplet discharged from the nozzle 331 changes depending on the volume of the droplet.
  • the flying speed of the droplet is relatively slow, the airflow generated by the relative movement of the inkjet head 30 with respect to the fixed stage ST prevents the droplet from advancing.
  • the droplet landing position may deviate from the coating target position.
  • the flying speed of the droplet is relatively high, satellites caused by the droplet are likely to occur. Satellites tend to land at positions different from the target application position. For this reason, the landing positions of the droplets vary.
  • the flying speed of the droplet is less than 3 m/s, the landing position of the droplet will be disturbed. It is known that when the flight speed is higher than 8 m/s, satellites are generated due to droplets.
  • the control device 15 changes the droplet volume within a range where the flying speed of the droplet is 3 m/s or more and 8 m/s or less. More preferably, the control device 15 changes the volume of the droplet within a range where the flight speed of the droplet is 3.5 m/s or more and 6.5 m/s or less.
  • the control device 15 drives the servo motor 304 to rotate the inkjet head 30 around the Z-axis, and tilts the arrangement direction of the plurality of nozzles 331 with respect to the Y-axis direction. Specifically, the control device 15 tilts the arrangement direction of the nozzles 331 at a predetermined angle ⁇ with respect to the longitudinal direction of the application target area, as shown in FIGS. 7 and 8.
  • the predetermined angle ⁇ is greater than 0 degrees and less than 90 degrees.
  • the control device 15 adjusts the arrangement direction of the nozzles 331 in a range greater than 0 degrees and less than 90 degrees so that the intervals between the droplet landing positions in the Y-axis direction are the desired intervals. do.
  • control device 15 moves the inkjet head 30 in the X-axis direction while maintaining the state where the inkjet head 30 is tilted at a predetermined angle ⁇ , and directs the inkjet head 30 toward a plurality of coating target positions that are two-dimensionally arranged on the printing target. droplets are ejected through the plurality of nozzles 331.
  • the same application target area can be printed, compared to when the nozzle 331 arrangement direction is parallel to the longitudinal direction of the application target area. More nozzles 331 can be allocated to. Therefore, the occurrence of printing unevenness can be further suppressed.
  • the predetermined unit ejection amount is v
  • the adjustment signals S11 to S18 in FIG. Suppose the quantity increases. It is also assumed that when the addition/subtraction signals S11 to S18 are subtracted, the ink ejection amount decreases by an amount of 1v to 8v compared to the ink ejection amount based on the reference voltage signal.
  • FIG. 13 is a flowchart illustrating an example of a printing operation performed by the printing device 1.
  • a specific coating target position hereinafter referred to as a "specific position” may be described in detail.
  • step S101 the control device 15 determines that the ink ejection amount is within an allowable range based on the reference ejection amount and allowable amount set for each of the plurality of nozzles 331 at a plurality of target application positions lined up in the main scanning direction.
  • the options regarding the ink ejection amount are determined so that the amount of ink is within the range and varies within the allowable range.
  • the options regarding the ink ejection amount are options that are made up of combinations of adjustment signals and processing details.
  • the allowable range at the specific position is 7v or more and 13v or less.
  • the control device 15 determines options for adjustment signals and processing contents, and selects one option from among them so that the ink ejection amount at a specific position varies within the allowable range while keeping it within the allowable range of 7v or more and 13v or less. do.
  • the control device 15 determines an option that is a minimum of 3v less than the reference discharge amount 10v and a maximum of 3v more. That is, the control device 15 determines the addition processing of the addition/subtraction signals S11 to S13 and the subtraction processing of the addition/subtraction signals S11 to S13 as options, and determines one option from among them. In the following description, it will be assumed that the control device 15 has determined the option of "subtraction processing of the addition/subtraction signal S13" (discharge amount is 7v) for the specific position. Further, the control device 15 performs the same processing as the processing for the specific position on other coating target positions.
  • step S102 the control device 15 generates a voltage signal for application to each coating target position based on the determined options, and executes forward printing based on the generated voltage signal. As a result, 7V ink is ejected to the specific position.
  • control device 15 may measure the volume of the ink droplet ejected from the nozzle 331 using, for example, an observation device such as the droplet observation device 40.
  • step S103 the control device 15 determines whether it is time to end printing. For example, the control device 15 counts the number of times of printing, and when the count value reaches a preset number of times depending on the object to be printed, it determines that it is time to end printing, and the number of times of printing is reached. If the time has not been reached, it is determined that it is not the timing to end printing.
  • step S104 the control device 15 calculates the total amount of ink ejected at the time of determination in step S103 for each coating target position. For example, the control device 15 calculates the total amount of ink ejected by adding up the ink droplet volumes measured each time printing is performed for each application target position. For example, if printing has been performed once at the time of determination in step S103, the amount of ink ejected at the specific position is calculated to be 7V.
  • step S105 the control device 15 controls the ink ejection amount to fall within the allowable range based on the calculated total ink ejection amount, total reference ejection amount, and allowable amount for each coating target position.
  • options regarding the amount of ink to be ejected are determined.
  • the total standard ejection amount is the total amount of ink that should be ejected from the first printing to the next printing completion for each application target position, and more specifically, from the first printing to the next printing completion. It is the total of the standard discharge amount.
  • step S105 will be described as a process for determining the options to be used for the second printing.
  • the allowable amount dHx for the total reference ejection amount is 5v
  • control device 15 determines the adjustment signal and the processing content options so that the ink ejection amount at the specific position is 13v or more and 23v or less.
  • control device 15 determines an option that is a minimum of 2v less and a maximum of 8v more than the reference discharge amount 15v. That is, the control device 15 determines the subtraction processing of the addition/subtraction signals S11 to S12 and the addition processing of the addition/subtraction signals S11 to S18 as options, and determines one option from among them.
  • the options that can be selected for the specific position are the subtraction process of the addition/subtraction signals S11 to S12 and the addition process of the addition/subtraction signals S11 to S18.
  • the options that can be selected for the other coating target position are the addition/subtraction signals S11 to S18. It is also referred to as subtraction processing of , and addition processing of addition/subtraction signals S11 to S12.
  • step S105 is a process of determining options for the adjustment signal and processing content to be used for the i-th printing
  • the process may be performed in the same manner as for the second printing.
  • the control device 15 determines that the total reference ejection amount for the first to i times at the specific position is SH(i), the allowable amount dSH(i) for the total reference ejection amount, and the ink that has already been ejected at the specific position. Based on the total ejection amount SS(i-1), an allowable range of the i-th ink ejection amount is calculated.
  • the minimum value of the allowable range is SH(i)-dSH(i)-SS(i-1), and the maximum value is SH(i)+dSH(i)-SS(i-1). Then, the control device 15 determines options for combinations of adjustment signals and processing contents such that the ink ejection amount falls within an allowable range, and selects one option from among them. The control device 15 performs similar processing for other coating target positions.
  • step S106 the control device 15 uses the determined options to generate a voltage signal for application to each coating target position, and executes backward printing or forward printing based on the generated voltage signal. Note that the control device 15 executes backward printing when the number of times of processing in step S106 is an odd number, and executes forward printing when the number of times of processing is an even number.
  • steps S104 to S106 are repeated until it is determined that it is time to end printing.
  • FIG. 14 is a diagram showing an example of the total standard ejection amount SH(i) and its allowable amount until a predetermined number of printings are completed.
  • FIG. 14 shows that the first ink, second ink, and third ink are printed twice, three times, and three times, respectively, in this order.
  • SH(i) is the total standard ejection amount of ink from the first to i times of printing at a specific position
  • tolerable amount of SH(i) is the allowable amount from SH(i). This is the amount of deviation.
  • FIG. 15 is a diagram showing an example of the total standard ejection amount and its allowable amount for each of a plurality of types of ink.
  • the total standard ejection amounts SH 1 (i), SH 2 (i), and SH 3 (i) of the first ink, second ink, and third ink are each 25v. , 35v, and 40v, and their respective allowable amounts are shown to be 5v, 5v, and 6v.
  • the control device 15 executes the printing operation so that at least one of the following conditions (A0), (A1), and (A2) is satisfied depending on the number of times of printing.
  • the condition (A0) is satisfied when the processes in steps S101 to S102 in FIG. 13 described above are executed
  • the condition (A1) is satisfied when the processes in steps S104 to S106 in FIG. 13 described above are executed. filled with.
  • (A0) At the plurality of coating target positions lined up in the main scanning direction, the ink ejection amount is kept within the allowable range based on the reference ejection amount and the allowable amount set for each of the plurality of nozzles 331. Make it vary.
  • control device 15 executes the first printing in forward printing so as to satisfy the condition (A0).
  • control device 15 executes the second printing as a return printing so as to satisfy the condition (A1).
  • control device 15 performs the third to fifth printings as forward printing, return printing, and Execute on outward printing.
  • the control device 15 executes the third and fourth printings so that the condition (A1) is satisfied, and executes the fifth printing so that both the conditions (A1) and the conditions (A2) are satisfied.
  • the fifth printing will be explained below.
  • the standard ejection amount for the fifth printing is 10v
  • the minimum is 6v less than the standard ejection amount of 10v
  • the maximum is 6v more.
  • the subtraction processing of the addition/subtraction signals S11 to S17 and the addition processing of the addition/subtraction signals S11 to S13 may be determined as options.
  • the control device 15 narrows down the options to subtraction processing of addition/subtraction signals S11 to S16 and addition processing of addition/subtraction signals S11 to S13, and selects one of the narrowed down options. Decide on one option. Similarly, the control device 15 determines options for adjustment signals and processing contents for other coating target positions, and determines one option from among them. Then, the control device 15 executes the printing process based on the determined options.
  • control device 15 performs the 6th to 8th printing, respectively, by performing backward printing, outward printing, and Execute during return printing. For example, the control device 15 executes the 6th to 7th printing so that condition (A1) is satisfied, and executes the 8th printing so that both condition (A1) and condition (A2) are satisfied.
  • the eighth printing will be explained below.
  • the standard ejection amount for the 8th printing is 10v
  • the minimum is 8v less than the standard ejection amount of 10v
  • the maximum is 6v more. What is necessary is to determine the options for ejecting ink. That is, it is sufficient to determine options for subtracting the addition/subtraction signals S11 to S18 and addition processing for the addition/subtraction signals S11 to S16, and then determining one option from among them.
  • the control device 15 narrows down the options to subtraction processing of the addition/subtraction signals S11 to S14 and addition processing of the addition/subtraction signals S11 to S16, and selects one of the narrowed down options. , decide on one option. Similarly, the control device 15 determines options for adjustment signals and processing contents for other coating target positions, and determines one option from among the options. Then, print processing is executed based on the determined options.
  • the total ejection amount of the plurality of types of ink can be varied at the plurality of coating target positions arranged in the main scanning direction while keeping the total ejection amount within the allowable range. Furthermore, it is possible to vary the total amount of ink ejected for each type of ink while keeping it within the allowable range of the total amount of ink ejected.
  • the final printing of the second ink and the third ink is performed so as to satisfy the conditions (A1) and (A2), but the present invention is not limited to this.
  • printing may be performed so that conditions (A1) and (A2) are satisfied in printing the second ink and the third ink, that is, in all printings after the third time.
  • a printing target may include a first panel area in which first application target areas are arranged, and a second panel area in which second application target areas narrower than the first application target area are arranged.
  • a plurality of coating target positions are assigned to each of the first coating target area and the second coating target area, but the arrangement of coating target positions in the first coating target area is different from that in the second coating target area. This is different from the arrangement of the coating target positions.
  • the amount of ink to be applied to the first application area is greater than the amount of ink to be applied to the second application area. Therefore, the reference discharge amount for the first application target area is greater than the reference discharge amount for the second application target area.
  • control device 15 makes the allowable range of the ink ejection amount for the second application target area narrower than the allowable range of the ink ejection amount for the first application target area.
  • the control device 15 selects the addition processing of the addition/subtraction signals S11 to S18 and the addition/subtraction signal S11 as options for the processing contents and the addition/subtraction signals to be applied to the reference voltage signal. - Determine the subtraction process in S18. Then, the control device 15 determines one option from among them for each coating target position. As a result, while keeping the discharge amount within the tolerance range of ⁇ 8v with respect to the reference discharge amount, the discharge amount is varied for each coating target position within the tolerance range.
  • the control device 15 selects the addition processing of the addition and subtraction signals S11 to S14 and the addition processing of the addition and subtraction signals S11 to S14 as options for the processing contents and the addition and subtraction signals to be applied to the reference voltage signal. - Determine the subtraction process in S14. Then, the control device 15 determines one option from among them for each coating target position. Thereby, while keeping the discharge amount within the tolerance range of ⁇ 4v with respect to the reference discharge amount, the discharge amount is varied for each coating target position within the tolerance range.
  • control device 15 may generate new addition/subtraction signals S21 to S28 by multiplying the amplitude of each of the addition/subtraction signals S11 to S18 by k (k is a number greater than or equal to 0 and less than 1).
  • the control device 15 selects the addition processing of the addition and subtraction signals S21 to S28 and the addition processing of the addition and subtraction signals S21 to S28 as options for the processing contents and the addition and subtraction signals to be applied to the reference voltage signal.
  • the subtraction processing in steps S28 to S28 may be determined.
  • ⁇ Device manufacturing example> an example of manufacturing a device using the printing apparatus 1 will be described, taking as an example the manufacturing of an organic EL display panel.
  • functional layers such as a hole injection layer, a hole transport layer, and a light emitting layer are formed in areas defined by banks on the electrodes.
  • the control device 15 sequentially discharges a plurality of types of ink toward a coating target position on an electrode, which is an object to be printed.
  • the multiple types of ink include an ink containing the material for the hole injection layer (hereinafter referred to as the "fourth ink”), and an ink containing the material for the hole transport layer (hereinafter referred to as the "fifth ink”). , an ink containing a material for a light-emitting layer (hereinafter referred to as "sixth ink”), and the like.
  • the control device 15 discharges the fourth ink, the fifth ink, and the sixth ink according to the above-mentioned ⁇ Printing of multiple types of inks>.
  • control device 15 forms each functional layer so that the total film thickness of the hole injection layer, hole transport layer, and light emitting layer falls within a predetermined tolerance range regardless of the target coating position on the electrode. Can be done. Further, by setting the total standard ejection amount and its allowable range for each ink, the thickness of each layer can be kept within the allowable range for each layer.
  • control device 15 may be configured such that the total film thickness of the hole injection layer and the hole transport layer (corresponding to the total ejection amount of the fourth ink and the fifth ink) is the thickness d1 at a certain coating target position, and at another coating target position.
  • the control device 15 controls the thickness of the sixth ink for each coating target position so that the ejection amount of the sixth ink for one coating target position is smaller than that for another coating target position.
  • options for adjustment signals and processing contents are determined, and one option is determined from among them.
  • the control device 15 measures the thickness of the formed film using an observation device such as the landed droplet observation device 50, and generates adjustment signals for each coating target position based on the measurement results. and determine options for processing contents, and decide one option from among them. More specifically, the control device 15 determines options for adjustment signals and processing contents such that the discharge amount is smaller for coating target positions where the total film thickness is larger than the reference thickness, and selects options from among them. Decide on one option. Further, the control device 15 determines options for adjustment signals and processing contents so that the discharge amount becomes larger for a coating target position where the total film thickness is smaller than the reference thickness, and determines one option from among them. do.
  • the amount of ink ejected onto the film can be changed for each coating target position depending on the unevenness of the thickness of the film that has already been created, so the film thickness as a whole can be maintained at a predetermined level. It is possible to form a film with a desired thickness within the allowable range.
  • the film that is formed on the film can be made thin as a whole.
  • the film that is formed on the film can be made thick as a whole.
  • the printing apparatus 1 includes the inkjet head 30 having a plurality of nozzles 331.
  • the printing apparatus 1 also has a plurality of coating target positions lined up in the main scanning direction where the inkjet head 30 moves relative to the printing target, and a plurality of coating targets set for each of the plurality of nozzles 331.
  • a control device 15 for ejecting ink from a plurality of nozzles 331 is provided at a position. Further, the control device 15 changes the ink ejection amount for each of the plurality of application target positions within a predetermined tolerance range from the reference ejection amount set for each of the plurality of nozzles 331.
  • control device 15 may irregularly change the ink ejection amount for each of a plurality of target application positions.
  • control device 15 ejects the ink such that the difference value between the reference ejection amount and the actual ejection amount is different at the first application target position and the second application target position among the plurality of application target positions. You may let them.
  • control device 15 controls the ink ejection amount based on the control parameter, and adjusts the control parameter corresponding to the reference ejection amount in a plurality of different ways for each of the plurality of application target positions.
  • the ink ejection amount may be determined by selecting one of the signals and performing addition/subtraction processing.
  • the inkjet head 30 has a liquid chamber 321 in which ink is stored and a piezoelectric element 350 for each nozzle 331, and ink is ejected from the liquid chamber 321 by applying a voltage to the piezoelectric element 350. It may be.
  • the control parameter may be the amount of change in the voltage applied to the piezoelectric element 350.
  • the volume of droplets discharged from the nozzle 331 can be changed in a simple manner.
  • the control device 15 may apply to the piezoelectric element 350 a voltage signal having a reference potential Emid that is constant regardless of the piezoelectric element 350 and the target position, and a voltage change amount (ejection voltage).
  • the position of the ink liquid level inside the nozzle 331 is maintained at a constant position, so that droplets are stably ejected.
  • the control device 15 may set control parameters such that the flying speed of the ink is 3 m/s or more and 8 m/s or less, and may cause ink to be ejected from the plurality of nozzles 331. This allows ink to be applied accurately to the target position. Further, by setting the control parameters such that the control device 15 sets the flying speed of the ink to be 3.5 m/s or more and 6.5 m/s or less, it is possible to further improve the landing accuracy of the ink. .
  • the inkjet head 30 may move in the main scanning direction with the arrangement direction of the plurality of nozzles 331 being inclined with respect to the direction perpendicular to the main scanning direction (Y-axis direction). Therefore, the interval between the landing positions of the plurality of droplets discharged from the plurality of nozzles 331 can be narrowed. Therefore, it is possible to increase the number of nozzles 331 assigned to the same application target area, so that it is possible to further prevent uneven printing from occurring.
  • the control device 15 determines the total amount of ink ejected to each of the plurality of application target positions based on the amount of ink that has already been ejected to each of the plurality of application target positions.
  • the ink ejection amount may be changed for each of the plurality of coating target positions so that the ink ejection amount falls within a predetermined tolerance range from the total reference ejection amount to be ejected to each coating target position.
  • the total amount of ink ejected can be kept within a certain range while being varied appropriately for each target application position. Therefore, when printing multiple times, printing unevenness can be further suppressed.
  • control device 15 may cause different types of ink to be ejected toward the same application target position.
  • the total ejection amount of the plurality of types of ink can be appropriately varied while being kept within a certain range.
  • the total thickness of the hole injection layer, hole transport layer, and light emitting layer must be adjusted to an appropriate thickness. Can be done.
  • the light emitted from the light emitting layer has a first light component that is directly extracted to the outside of the display panel, and a second light component that is reflected by the electrode that is the lower layer of the hole injection layer.
  • the second light component can be easily outputted to the outside of the display panel by manufacturing the plurality of functional layers described above to have an appropriate total thickness. That is, a display panel with high luminous efficiency can be produced.
  • the control device 15 may change the combination of a plurality of different adjustment signals, which are options for determining the amount of ink to be ejected, based on the amount of ink that has already been ejected to each of the plurality of application target positions.
  • the amount of ink ejected each time is kept within the allowable range of the standard ejection amount set for each target coating position, while varying the amount of ink ejected each time. You can use it.
  • the control device 15 controls a plurality of third coating target positions (coating target positions in the first panel area) and a plurality of third coating target positions different in arrangement from each other.
  • the tolerance range from the standard discharge amount for the plurality of third coating target positions and the tolerance range from the standard discharge amount for the plurality of fourth coating target positions may be set to a different range.
  • different adjustment signals S11 to S18 are selected for all the nozzles 331 and the number of ejections.
  • the control device 15 may select the adjustment signals S11 to S18 according to (1) to (3) below, for example. Note that the nozzle numbers and coating target position numbers used in the following description correspond to the nozzle numbers and coating target position numbers in FIG. 12, respectively.
  • the control device 15 may select the same adjustment signals S11 to S18 for a plurality of coating target positions lined up along the X-axis direction. For example, when a droplet is ejected multiple times onto the same application target area using a specific nozzle, the same adjustment signal may be applied to the specific nozzle.
  • control device 15 applies the same adjustment to all coating target positions included in two or more adjacent coating target areas. Signals S11 to S18 may be selected.
  • the control device 15 may select the same adjustment signal for multiple nozzles 331 assigned to the same coating target area. For example, the nozzles 331 with numbers “1", “2”, and “3” are applied to the same application target area, and the nozzles 331 with numbers “7”, “8", and “9” are applied to another same application target area. If the area, nozzles 331 with numbers “13", “14”, and “15” are assigned to another same application target area, nozzles with numbers “1", “2", and “3” 331, the same addition/subtraction signal for nozzles 331 with numbers “7", “8", and “9", and the same addition/subtraction signal for nozzles 331 with numbers “13", “14”, and “15”. The same addition/subtraction signal may be selected for both.
  • control parameter is described as ejection voltage, but it does not necessarily have to be ejection voltage or may be a parameter other than voltage as long as it is a parameter that correlates with the volume of the droplet.
  • control device 15 has been described as changing the control parameters irregularly, but the control parameters may be changed so that each nozzle 331 has a different periodicity.
  • a single nozzle row consisting of a plurality of nozzles 331 was formed in the head portion 301 of the inkjet head 30, but a plurality of nozzle rows may be formed. Further, a plurality of nozzles 331 may be arranged in a staggered manner on the head portion 301. When the plurality of nozzles 331 are formed in a staggered manner, it is easier to narrow the interval between droplet landing positions in the Y-axis direction.
  • control device 15 may perform the above-described droplet volume control for each nozzle row, for example.
  • the printing device 1 may include a plurality of inkjet heads 30.
  • the present disclosure can be suitably applied to a semiconductor laser element in which a protective layer is disposed on the laser light emitting end face side.
  • Control device 15 Control device 20 Inkjet stage 30 Inkjet head 40 Droplet observation device 50 Landed droplet observation device 60 Ink van 151 Storage section 152 Input section 153 Display section 154 CPU 200 Base 204A Linear motor 204B Linear motor 205A Linear motor 205B Linear motor 220A Pedestal 220B Pedestal 221A Servo motor 221B Servo motor 230A First slide unit 230B Second slide unit 240 Control section 300 Main body section 301 Head section 304 Servo motor 310 control part 320 Head main body 321 Liquid chamber 330 Nozzle plate 331 Nozzle 340 Vibration plate 350 Piezoelectric element 402 Droplet observation camera 404 Cable 410 Control section 501 Photographing unit 510 Control section 520 Display panel 521 Line area (coating target area) 600 Display panel 601 Cell area (coating target area) 700 Control table ST Fixed stage

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Coating Apparatus (AREA)
  • Ink Jet (AREA)

Abstract

Le présent appareil d'impression comprend : une tête à jet d'encre dotée d'une pluralité de buses ; et un dispositif de commande qui provoque l'éjection de l'encre à partir des buses respectives vers une pluralité de positions cibles qui sont définies pour les buses respectives et qui sont alignées dans la direction de balayage dans laquelle la tête à jet d'encre est déplacée par rapport à un objet d'impression. Le dispositif de commande fait varier la quantité d'éjection d'encre pour chaque position de la pluralité de positions cibles dans une plage admissible prédéterminée à partir d'une quantité d'éjection de référence qui est définie pour chaque buse de la pluralité de buses.
PCT/JP2023/004023 2022-03-30 2023-02-07 Appareil d'impression et procédé d'impression WO2023188838A1 (fr)

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JP2022-056299 2022-03-30

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WO2023188838A1 true WO2023188838A1 (fr) 2023-10-05

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008191373A (ja) * 2007-02-05 2008-08-21 Toppan Printing Co Ltd 吐出パターン生成装置及び吐出パターン生成方法、並びにカラーフィルタ及び有機機能性素子の製造方法
JP2009082807A (ja) * 2007-09-28 2009-04-23 Toppan Printing Co Ltd 吐出パターンの生成方法、及びこれを用いたカラーフィルタと有機機能性素子の製造方法、及びこれに用いる吐出パターンの生成装置
JP2010079211A (ja) * 2008-09-29 2010-04-08 Toppan Printing Co Ltd 光学素子、カラーフィルタ及び有機機能性素子の製造方法、及びこれに用いる吐出パターン生成装置
WO2014006877A1 (fr) * 2012-07-05 2014-01-09 パナソニック株式会社 Appareil à jet d'encre et procédé pour fabriquer un dispositif el organique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008191373A (ja) * 2007-02-05 2008-08-21 Toppan Printing Co Ltd 吐出パターン生成装置及び吐出パターン生成方法、並びにカラーフィルタ及び有機機能性素子の製造方法
JP2009082807A (ja) * 2007-09-28 2009-04-23 Toppan Printing Co Ltd 吐出パターンの生成方法、及びこれを用いたカラーフィルタと有機機能性素子の製造方法、及びこれに用いる吐出パターンの生成装置
JP2010079211A (ja) * 2008-09-29 2010-04-08 Toppan Printing Co Ltd 光学素子、カラーフィルタ及び有機機能性素子の製造方法、及びこれに用いる吐出パターン生成装置
WO2014006877A1 (fr) * 2012-07-05 2014-01-09 パナソニック株式会社 Appareil à jet d'encre et procédé pour fabriquer un dispositif el organique

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