Liquid ejection head, drive circuit therefor, inkjet or 3D printer, dispensing device

Abstract

The present application provides a liquid ejection head capable of realizing delay of drive timing between channels, a drive circuit thereof, an inkjet or 3D printer, and a dispensing device. The liquid ejection head drive circuit of the embodiment includes a common waveform generation section, a timing generation section, and a selection drive circuit. The common waveform generation section generates a common waveform in which waveform elements of a plurality of drive waveforms having different start points, in which a preceding waveform ends and a waveform on a delay side starts, or a waveform on the delay side ends and the preceding waveform starts, are mixed. The timing generation section generates a plurality of extraction timings that are different from each other. The selection drive circuit extracts drive waveforms having different start points by extracting the waveform elements in accordance with the extraction timings, and supplies the electrostatic capacitive actuators of a plurality of channels that eject liquid with the drive waveforms, respectively.

Description

Technical Field

[0001] The embodiments of the present invention relate to a liquid ejector head drive circuit and a liquid ejector head. Background Technology

[0002] A liquid ejector head is known to supply a specified amount of liquid to a specified location. The liquid ejector head is mounted on, for example, an inkjet printer, a 3D printer, or a dispensing device. An inkjet printer ejects droplets of ink from its printhead, forming images on the surface of a recording medium. A 3D printer ejects droplets of modeling material from its modeling material ejector head and solidifies them to form a three-dimensional model. A dispensing device ejects droplets of a sample and supplies a specified amount to multiple containers.

[0003] The liquid ejector head has multiple channels for ejecting liquid. Each channel includes a nozzle for ejecting liquid, a pressure chamber connected to the nozzle, and an actuator. The liquid ejector head selects the channel from the multiple channels for ejecting liquid and provides a drive signal to the actuator to actuate it. When the actuator is actuated, the volume of the pressure chamber filled with liquid changes, and liquid is ejected from the nozzle.

[0004] Liquid nozzles with multiple channels suffer from problems such as crosstalk between channels caused by pressure vibrations and voltage drops caused by current concentration when driving multiple channels. As countermeasures, one method is to stagger the drive timing between surrounding channels. However, to achieve this inter-channel drive timing delay, it is necessary to prepare the drive waveform and wiring pattern for each delay separately. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a liquid ejector driving circuit and a liquid ejector head that can realize the delay of driving timing between channels.

[0006] The liquid ejector head drive circuit of this invention includes a common waveform generation unit, a timing generation unit, and a selection drive circuit. The common waveform generation unit generates a common waveform, which incorporates waveform elements of multiple drive waveforms with different start points: the waveform on the delayed side begins before the preceding waveform ends, and the preceding waveform ends before the waveform on the delayed side ends. The timing generation unit generates multiple different extraction timings. The selection drive circuit extracts drive waveforms with different start points by extracting waveform elements according to the extraction timings and provides them to electrostatic capacitive actuators of multiple channels ejecting liquid.

[0007] The liquid ejector head according to an embodiment of the present invention comprises: a plurality of channels, each having a nozzle for ejecting liquid and an actuator; a liquid supply unit for supplying liquid to the channels; and the liquid ejector head drive circuit described above.

[0008] The inkjet printer of the present invention forms an image on the surface of a recording medium and is equipped with the liquid ejection head described above.

[0009] The 3D printer of the present invention forms a three-dimensional model and is equipped with the liquid ejection head described above.

[0010] The dispensing device of the present invention supplies a predetermined amount of sample to multiple containers and is equipped with the aforementioned liquid spray head. Attached Figure Description

[0011] Figure 1 This is an overall configuration diagram of an inkjet printer equipped with an inkjet head according to an embodiment.

[0012] Figure 2 This is a 3D view of the inkjet head mentioned above.

[0013] Figure 3 This is a cross-sectional view of the actuator of the aforementioned inkjet head.

[0014] Figure 4 This is a module configuration diagram of the inkjet head drive circuit according to the implementation method.

[0015] Figure 5 This is a detailed diagram of the selection drive circuit within the inkjet head drive circuit described above.

[0016] Figure 6 This is a timing diagram of the operation of the inkjet head drive circuit described above.

[0017] Explanation of reference numerals in the attached figures

[0018] 10 Inkjet printer; 100-103 inkjet heads; 2 Nozzle heads; 25 Nozzles; 31 Driver IC; 5 Actuator; 51 Pressure chamber; 52 Air chamber; 6 Inkjet head drive circuit; 61 Common waveform generation unit; 62 Timing generation unit; 63 Image generation unit; 64 Selection drive circuit; 7 Selection unit; 71 Switch. Detailed Implementation

[0019] Hereinafter, a liquid ejector head according to the embodiment will be described in detail with reference to the accompanying drawings. It should be noted that in each figure, the same components are labeled with the same reference numerals.

[0020] As an example of an image forming apparatus equipped with a liquid ejector head according to the embodiment, an inkjet printer 10 that prints images on a recording medium will be described. Figure 1The outline of the inkjet printer 10 is shown. Inside the housing 11, the inkjet printer 10 includes: a cartridge 12 for storing a sheet S, an example of a recording medium; an upstream transport channel 13 for the sheet S; a conveyor belt 14 for transporting the sheet S removed from the cartridge 12; multiple inkjet heads 100-103 for ejecting ink droplets toward the sheet S on the conveyor belt 14; a downstream transport channel 15 for the sheet S; an ejection tray 16; and a control board 17. An operation unit 18, serving as a user interface, is located on the upper side of the housing 11.

[0021] Image data printed on the sheet S is generated, for example, by a computer 200, which is an external connection device. The image data generated by the computer 200 is sent to the control board 17 of the inkjet printer 10 via cables 201 and connectors 202 and 203.

[0022] Pick-up roller 204 feeds sheets S one by one from cassette 12 to upstream conveyor channel 13. Upstream conveyor channel 13 is composed of feed roller pairs 131 and 132 and sheet guide plates 133 and 134. Sheets S are delivered to the upper surface of conveyor belt 14 via upstream conveyor channel 13. Arrow 104 in the figure shows the conveying path of sheet S from cassette 12 to conveyor belt 14.

[0023] The conveyor belt 14 is a mesh-like annular belt with multiple through holes formed on its surface. Three rollers—drive roller 141, driven rollers 142, and 143—rotate freely, supporting the conveyor belt 14. A motor 205 rotates the conveyor belt 14 by rotating the drive roller 141. The motor 205 is an example of a drive unit. 105 in the figure shows the direction of rotation of the conveyor belt 14. A negative pressure container 206 is disposed on the back side of the conveyor belt 14. The negative pressure container 206 is connected to a fan 207 for pressure reduction. The fan 207 creates a negative pressure inside the negative pressure container 206 through the airflow, causing the sheet S to adhere and remain on the upper surface of the conveyor belt 14. 106 in the figure shows the airflow.

[0024] As an example of a liquid ejector head, inkjet heads 100-103 are configured to face the sheet S, which is held on the conveyor belt 14, with a small gap of, for example, 1 mm. Inkjet heads 100-103 eject ink droplets onto the sheet S. Inkjet heads 100-103 print images as the sheet S passes underneath. Each inkjet head 100-103 has the same structure except for the color of the ejected ink. The ink colors are, for example, cyan, magenta, yellow, and black.

[0025] Inkjet heads 100-103 are connected to ink tanks 315-318 and ink supply pressure adjustment devices 321-324 via ink flow paths 311-314, respectively. Each ink tank 315-318 is positioned above each inkjet head 100-103. In standby mode, to prevent ink from flowing from the nozzles 25 (see reference) of inkjet heads 100-103... Figure 2When ink leaks out, the ink supply pressure adjustment devices 321-324 adjust the pressure in each printhead 100-103 to a negative pressure relative to atmospheric pressure, for example, -1.2 kPa. When forming an image, the ink in each ink tank 315-318 is supplied to each printhead 100-103 through the ink supply pressure adjustment devices 321-324.

[0026] After the image is formed, the sheet S is conveyed from the conveyor belt 14 to the downstream conveyor channel 15. The downstream conveyor channel 15 consists of feed roller pairs 151, 152, 153, and 154, and sheet guide plates 155 and 156 that define the conveying path of the sheet S. The sheet S is conveyed from the discharge port 157 to the discharge tray 16 via the downstream conveyor channel 15. Arrow 107 in the figure shows the conveying path of the sheet S.

[0027] Next, the structure of inkjet heads 100-103 will be explained. (Refer to the following...) Figures 2-3 The inkjet head 100 will be described, but inkjet heads 101 to 103 also have the same structure as inkjet head 100.

[0028] like Figure 2 As shown, the inkjet head 100 includes a nozzle head 2, which is an example of a liquid ejection section, and a flexible printed wiring board 3, which is an example of a printed wiring substrate. The nozzle head 2 includes: a nozzle plate 21, an actuator substrate 22, a sealing member 23 that seals the openings of a pressure chamber 51 and an air chamber 52 formed on the actuator substrate 22, and an ink supply port 24 formed on the sealing member 23. The ink supply port 24 is connected to an ink flow path 311. Figure 1 Ink supply pressure adjustment device 321.

[0029] The flexible printed wiring board 3 is connected to the actuator substrate 22 of the nozzle head 2 and the printing substrate 4, which serves as a relay substrate. The flexible printed wiring board 3 is equipped with a driver IC (Integrated Circuit) 31 (hereinafter referred to as the driver IC), which serves as a driver chip. The driver IC 31 temporarily stores the printing data transmitted from the control substrate 17 of the inkjet printer 10 via the printing substrate 4 and provides drive signals to each channel to eject ink at a predetermined time.

[0030] The nozzle plate 21 is, for example, a rectangular plate formed of a resin such as polyimide or a metal such as stainless steel. Multiple ink-ejecting nozzles 25 are formed on the surface of the nozzle plate 21. The nozzle density is, for example, set in the range of 150 to 1200 dpi.

[0031] The actuator substrate 22 is, for example, a rectangular substrate formed of insulating ceramic. Figure 3As shown, multiple ink pressure chambers 51 and air chambers 52 are alternately formed on the actuator substrate 22 along a first direction, such as the X direction. The pressure chambers 51 communicate with the nozzle 25. The pressure chambers 51 communicate with the ink supply port 24, for example, via a common ink chamber (not shown) formed on the actuator substrate 22 or the sealing member 23. That is, the nozzle head 2 supplies ink to the pressure chambers 51 of each channel through the ink supply port 24. In other words, the nozzle head 2 serves as both a liquid ejection section and a liquid supply section. On the other hand, the air chambers 52, which are arranged adjacent to the pressure chambers 51, are enclosed spaces that do not communicate with the nozzle 25 and the common ink chamber (not shown). The pressure chambers 51 and air chambers 52 are formed on the actuator substrate 22, for example, by cutting two piezoelectric members 26 and 27 stacked in opposite polarization directions (for example, opposing directions) into rectangular slots in a second direction, such as the Z direction. That is, the pressure chamber 51 and the air chamber 52 are separated by piezoelectric components 26 and 27 stacked in a third direction, such as the Y direction, as sidewalls.

[0032] Electrode 53 is integrally formed on the bottom surface and two sides of pressure chamber 51. Electrode 53 of pressure chamber 51 is connected to a separate wiring 54, which serves as a wiring component. Electrode 55 is integrally formed on the bottom surface and two sides of air chamber 52. Electrode 55 of air chamber 52 is connected to a common wiring 56, which serves as a wiring component. That is, the connection point between electrode 53 of pressure chamber 51 and the separate wiring 54 is one terminal of actuator 5. The connection point between electrode 55 of air chamber 52 and the common wiring 56 is the other terminal of actuator 5. Electrodes 53, 55, separate wiring 54, and common wiring 56 are formed, for example, using a nickel film. Separate wiring 54 is connected to drive IC 31 (i.e., the drive circuit for each channel). Drive IC 31 provides drive voltages as drive signals to actuators 5 in each channel. Voltages V1 and V2 are provided to drive IC 31 as power supplies for the drive voltages. Common wiring 56 is grounded (GND), for example. As an example, voltage V1 is set to a positive voltage, voltage V2 is set to a negative voltage, and voltage V3 is set to 0V (=GND). With this configuration, the actuator 5, which provides the driving voltage, is subjected to an electric field in a direction that intersects (preferably orthogonal) the polarization axes of the piezoelectric components 26 and 27. The piezoelectric components 26 and 27, which serve as the sidewalls of the actuator 5 in the X direction, deform symmetrically in the X direction in a shearing mode.

[0033] That is, the ink pressure chamber 51 is formed between a pair of cylindrical actuators 5 using piezoelectric components 26 and 27. By providing a potential difference to the two walls of the cylindrical actuators 5, i.e., the inner and outer walls of the pressure chamber 51, the electrostatic capacitive actuators 5 using piezoelectric components 26 and 27 are charged / discharged, thereby deforming the actuators 5. As a result, the volume of the pressure chamber 51 changes, and consequently, the ink pressure within the pressure chamber 51 changes. By adjusting the magnitude and timing of this change, ink is ejected from the nozzle 25.

[0034] Figure 4 This is a module configuration diagram of the inkjet head drive circuit 6 within the driver IC 31. The inkjet head drive circuit 6 includes a common waveform generation unit 61, a timing generation unit 62, an image generation unit 63, and a selection drive circuit 64.

[0035] The common waveform generation unit 61 generates the common waveform, as detailed later. It sends the common waveform to the selection drive circuit 64. The timing generation unit 62 sends the waveforms of group A and group B to the selection drive circuit 64 via pulses, and synchronizes the timing of the operations of the common waveform generation unit 61 and the image generation unit 63. The image generation unit 63 generates image data for each channel and sends it to the selection drive circuit 64. The image data generated for each channel includes information on whether ink was ejected from that channel.

[0036] The detailed circuit configuration of the selected drive circuit 64 is as follows: Figure 5 As shown, each channel (ch1 to chN) has a selection unit 7 and an output unit. An example of the selection unit 7 is an AND circuit. The output unit is, for example, a switch 71. An example of the switch 71 is a CMOS analog switch. Image data (ch1 image to chN image) from the image generation unit 63 is input to the selection unit 7 of the corresponding channel. For example, when ink is ejected, a 1-bit signal of "1" is provided, and when ink is not ejected, a 1-bit signal of "0" is provided.

[0037] Multiple channels (ch1 to chN) are grouped. For example, odd-numbered channels (ch1, 3, ..., n-1) are designated as group A, and even-numbered channels (ch2, 4, ..., n) are designated as group B. Waveforms from group A generated by timing generation unit 62 are input as pulses to selection units 7 of the odd-numbered channels (ch1, 3, ..., n-1). Waveforms from group B generated by timing generation unit 62 are input as pulses to selection units 7 of the even-numbered channels (ch2, 4, ..., n). When ink is ejected based on image data, selection units 7 of odd-numbered channels (ch1, 3, ..., n-1) output a pass signal based on the waveform passing pulses of group A. When ink is ejected based on image data, selection units 7 of even-numbered channels (ch2, 4, ..., n) output a pass signal based on the waveform passing pulses of group B. The signal controls the on / off state of switch 71. During the period when switch 71 is turned on, the common waveform supplies the drive voltage to actuator 5 through switch 71. That is, a portion of the waveform elements in the common waveform becomes the drive waveform and is supplied to actuator 5 through switch 71.

[0038] like Figure 6 As shown in the time diagram, the common waveform is a waveform in which waveform elements of the driving waveforms of group A and group B are mixed in a non-overlapping manner with their mutual change points. Figure 6 As an example, a common waveform is shown, consisting of waveform elements of the pull pulses of the driving waveform of group A, the pull pulses of the driving waveform of group B, the cancel pulses of the driving waveform of group A, and the cancel pulses of the driving waveform of group B, which are sequentially mixed. That is, as an example of the driving waveform of the preceding group A and the driving waveform of the delayed group B, a driving waveform with the same shape but different start points is shown. If the conditions are met that the waveform of the delayed group B begins before the waveform of the preceding group A ends, and the waveform of the preceding group A ends before the waveform of the delayed group B ends, then the waveform shapes may not be the same, and the waveform shapes may be different. In this case, the waveform of the preceding group A and the waveform of the delayed group B have portions that do not overlap. Figure 6 Although the ejected pulses overlap, the canceling pulses do not. If the waveform as a whole overlaps, then regardless of whether its individual parts overlap or not, it can be like... Figure 6 That would only partially overlap. It should be noted that while the driving waveform for traction is used as an example, it could also be a driving waveform other than traction. Furthermore, it could be a driving waveform involving multiple drops. Multiple drops refers to a method where multiple drops are summed to form a single point.

[0039] The waveform passing pulse is an example of multiple different extraction timings generated by the timing generation unit 62. In other words, multiple extraction timings refer to multiple waveform passing pulses that extract waveform elements from the aforementioned common waveform in intervals that are different from each other. The waveform passing pulse prepares pulse trains of group A and group B. An example of a pulse train of group A is... Figure 6 The waveform shown in group A is a pulse. An example of a pulse train in group B is... Figure 6 The waveform of group B shown is transmitted through pulses. Although the pulse width and interval are the same for waveforms of group A and group B, the timing of the pulse initiation is different.

[0040] Next, especially referring to Figure 5 and Figure 6 The operation of the inkjet head drive circuit 6 will be explained. The common waveform generation unit 61 generates a common waveform and sends it to the selection drive circuit 64. The image generation unit 63 generates image data for each channel based on data sent from the control board 17 of the inkjet printer 10 and sends it to the selection drive circuit 64. The timing generation unit 62 synchronizes the timing of the operations of the common waveform generation unit 61 and the image generation unit 63, and sends the waveforms of group A and group B to the selection drive circuit 64 via pulses, respectively.

[0041] When ink is ejected based on image data, the selection unit 7 of each channel provides a pulse-through signal to the switch 71, which serves as the output unit, according to the waveform. First, the channel belonging to group A is activated (ON) by a pulse on the falling edge of the common waveform constituting the pull pulse, turning switch 71 on. During the pulse activation, switch 71 remains on, negatively charging actuator 5 to voltage V2. As a result, the two side walls of pressure chamber 51 deform outward, and the volume of pressure chamber 51 expands. Afterward, the pulse is turned off (OFF), and switch 71 is turned off (OFF), but even when switch 71 is off, the electrostatic capacitive actuator 5 maintains the voltage of the drive waveform at the moment switch 71 is turned off.

[0042] Next, the channel belonging to group B initiates a pulse on the falling edge of the common waveform constituting the traction pulse, turning on switch 71. During the pulse initiation, switch 71 remains on, negatively charging actuator 5 to voltage V2. As a result, the two side walls of pressure chamber 51 deform outward, expanding the volume of pressure chamber 51. Afterward, the pulse turns off, and switch 71 opens, but even when switch 71 is open, the electrostatic capacitive actuator 5 maintains the voltage of the drive waveform at the instant switch 71 is opened.

[0043] Next, the channel belonging to group A initiates a pulse at the rising edge of the common waveform constituting the traction pulse, and switch 71 is turned on. During the pulse initiation, switch 71 remains on, discharging actuator 5. Through this discharge, the outwardly deformed actuator 5 returns to its original state, the expanded pressure chamber 51 contracts back to its original volume, and ink is ejected from nozzle 25.

[0044] Next, the channel belonging to group B initiates a pulse at the rising edge of the common waveform constituting the traction pulse, and switch 71 is turned on. During the pulse initiation, switch 71 remains on, discharging actuator 5. Through this discharge, the outwardly deformed actuator 5 returns to its original state, the expanded pressure chamber 51 contracts back to its original volume, and ink is ejected from nozzle 25.

[0045] Next, the channel belonging to group A initiates a pulse at the rising edge of the common waveform constituting the cancelling pulse, turning on switch 71. During the pulse initiation, switch 71 remains on, positively charging actuator 5 to voltage V1. This charging causes the side walls of pressure chamber 51 to deform inwards, shrinking the volume of pressure chamber 51. This shrinkage attenuates residual vibration. Next, a pulse initiates at the falling edge of the common waveform constituting the cancelling pulse, turning on switch 71. During the pulse initiation, switch 71 remains on, discharging actuator 5.

[0046] Next, the channel belonging to group B initiates a pulse at the rising edge of the common waveform constituting the cancelling pulse, turning on switch 71. During the pulse initiation, switch 71 remains on, positively charging actuator 5 to voltage V1. This charging causes the side walls of pressure chamber 51 to deform inwards, shrinking the volume of pressure chamber 51. This shrinkage attenuates residual vibration. Then, a pulse initiates at the falling edge of the common waveform constituting the cancelling pulse, turning on switch 71. During the pulse initiation, switch 71 remains on, discharging actuator 5.

[0047] In this way, each channel extracts the waveform elements of the corresponding group from the common waveform of the mixed drive waveforms of group A and group B as the drive waveform to drive actuator 5. In this embodiment, multiple channels are grouped, allowing simultaneous driving in the same group and avoiding simultaneous driving in different groups. By delaying between channels in this way, crosstalk caused by pressure vibration can be suppressed. The reason for grouping with odd and even numbers is that crosstalk between adjacent channels is the greatest. Crosstalk between channels includes crosstalk via ink flow path, crosstalk due to mechanical connection, and electrical coupling (crosstalk due to common impedance, etc.), all of which are effective. Moreover, it can suppress the voltage drop caused by current concentration when multiple channels are driven simultaneously. However, although grouping with odd and even numbers is a preferred example, it is not limited to this. Of course, the number of groups is not limited to group A and group B, but can be three or more.

[0048] Alternatively, when the actuator 5 is repeatedly driven, for example, a flat portion is formed after the waveform element constituting the canceling pulse of group B with voltage V3 (=0V), where the pulse is initiated to reset (discharge) the actuator 5 to 0V. Furthermore, a waveform through pulse without pulse can also be provided for channels where ink is not ejected. In the case of pilot ejection, i.e., when it is necessary to provide micro-vibration to the actuator 5 in the channel where ink is not ejected, a waveform through pulse with a short pulse width driven by a low voltage for the channel where ink is not ejected can also be provided.

[0049] According to the above embodiment, by forming a common waveform in which waveform elements of multiple drive waveforms are mixed in such a way that the change points do not overlap, and by having a portion of the common waveform pass through each ink ejection channel as the composition of the drive waveform, it is possible to achieve the delay of drive timing between channels even without preparing, for example, drive waveforms and their wiring patterns for each delay amount separately.

[0050] The inkjet head 100 is not limited to a shear-mode actuator 5 that alternately arranges pressure chamber 51 and air chamber 52. For example, it may be configured such that multiple nozzles 25 and actuators 5 are arranged on the surface of nozzle plate 21. Other on-demand titration piezoelectric actuators 5 may also be used.

[0051] In the above embodiment, the inkjet head 100 of the inkjet printer 10 was described as an example of a liquid ejection device, but the liquid ejection device may also be a modeling material ejection head of a 3D printer or a sample ejection head of a dispensing device.

[0052] The embodiments of the present invention are presented as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other ways, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, and are similarly included within the scope of the invention as described in the claims and their equivalents.

Claims

1. A liquid ejection head drive circuit, characterized by, Possessing: a common waveform generation section that generates a common waveform that has waveform elements of a plurality of drive waveforms whose start points differ between a waveform on a delay side when a preceding waveform has not ended and a preceding waveform when a waveform on the delay side has not ended; a timing generation section that generates a plurality of extraction timings that differ from each other; and a selection drive circuit that extracts the drive waveforms whose start points differ by extracting the waveform elements in accordance with the extraction timings and supplies electrostatic capacitive actuators that eject liquid to a plurality of channels respectively.

2. The liquid ejection head drive circuit according to claim 1, characterized in that the start points of the plurality of drive waveforms differ, but the shapes of the waveforms are the same.

3. The liquid ejection head drive circuit according to claim 1 or 2, characterized in that the channels are classified into any one of a plurality of groups, the common waveform has waveform elements of a plurality of drive waveforms whose start points differ corresponding to the number of the groups.

4. The liquid ejection head drive circuit according to claim 3, characterized in that the common waveform includes a waveform element group of an arrangement of waveform elements of liquid ejection pulses of each of the groups and a waveform element group of an arrangement of waveform elements of cancellation pulses of each of the groups.

5. The liquid ejection head drive circuit according to claim 1, characterized in that the liquid ejection head drive circuit further possesses an image generation section that generates image data of each of the channels.

6. The liquid ejection head drive circuit according to claim 5, characterized in that the selection drive circuit possesses a selection section for each of the channels, and image data from the image generation section is input to the selection section of the corresponding channel respectively.

7. A liquid ejection head, characterized by, Possessing: a plurality of channels that each have a nozzle that ejects liquid and an actuator; a liquid supply section that supplies liquid to the channels; and the liquid ejection head drive circuit according to any one of claims 1 to 6.

8. An inkjet printer that forms an image on a surface of a recording medium, characterized in that the inkjet printer is equipped with the liquid ejection head according to claim 7.

9. A 3D printer that forms a three-dimensional molded article, characterized in that the 3D printer is equipped with the liquid ejection head according to claim 7.

10. An aliquoting device that supplies a prescribed amount of a sample to a plurality of containers, characterized in that the aliquoting device is equipped with the liquid ejection head according to claim 7.

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