Inkjet printhead and inkjet printing apparatus

Abstract

The application discloses an ink-jet printing head and an ink-jet printing device capable of making ink continuously flow. The ink-jet printing head comprises an ink-jet unit, an ink inlet channel and an ink outlet channel. The ink-jet unit comprises a nozzle, a pressure cavity and a heater. The nozzle is located above the pressure cavity, and the heater is located below the pressure cavity. The ink inlet channel and the ink outlet channel are respectively connected with the pressure cavity. The pressure of the ink inlet channel is positive pressure, and the pressure of the ink outlet channel is negative pressure. Ink continuously flows from the ink inlet channel into the pressure cavity, and then flows out of the ink outlet channel after passing through the pressure cavity. The continuous flow of ink at the nozzle and in the pressure cavity ensures that the nozzle is kept wet, avoids nozzle drying and hole blocking, removes residual bubbles and particle deposits in the flow channel of the ink-jet printing head, and finally improves the jetting capacity of the ink-jet printing head and prolongs the service life of the ink-jet printing head.

Description

Technical Field

[0001] The present invention belongs to the technical field of inkjet printing, and in particular relates to an inkjet printing head and an inkjet printing device. Background Art

[0002] Inkjet printing technology forms a pattern by controlling the liquid ejected from a printhead's nozzle into droplets, which are then ejected through a flying medium onto a target substrate. Inkjet printing offers the advantages of being contactless, maskless, high-throughput, and low-power. Since it doesn't require contact with the substrate, it can accurately print patterns on both flat surfaces and complex curved surfaces. In recent years, the rapid development of inkjet printing technology has seen increasing application in the manufacturing of micro-electromechanical systems (MEMS), biological tissues, and electronic products, in addition to traditional graphic printing. Mainstream inkjet printing technologies include continuous inkjet printing and drop-on-demand inkjet printing. Drop-on-demand inkjet printing involves selectively controlling the deformation of a piezoelectric element or the generation of bubbles by a heating element within the printhead, based on a predetermined print pattern. This pressure is then applied to the liquid within the printhead's pressure chamber, resulting in the desired printed pattern. Based on the liquid-driven principle, drop-on-demand inkjet printheads can be categorized as piezoelectric or thermal bubble inkjet.

[0003] Figure 1 、 Figure 2 (U.S. Patent 7,163,278) is a schematic diagram of the structure of a conventional thermal bubble inkjet print head. Figure 1 Two adjacent injection units are shown. Figure 2 This is the cross-sectional structure of a single ejection unit. A conventional thermal bubble jet printhead consists of a substrate 10, a pressure chamber layer 20, and a nozzle plate 30. The substrate 10 comprises a silicon base 11 and a multilayer thin film structure 12-16 thereon. The pressure chamber layer 20 is fixed to the substrate 10 and forms a pressure chamber array 22. The nozzle plate 30 is fixed to the pressure chamber layer 20 and includes a nozzle array 32 corresponding to each pressure chamber. When the thermal bubble jet printhead is in operation, liquid passes through the back of the substrate 10, flows through the ink inlet channel 24, and enters the pressure chamber 22. When the high-impedance heating element 13 on the substrate 10 receives a pulse signal of appropriate amplitude and duration, it rapidly heats up, vaporizing the liquid on the surface of the protective layer 16 to form bubbles, which squeeze the liquid in the pressure chamber 22. The portion of liquid near the nozzle 32 is pushed out of the nozzle 32 by the bubble pressure and forms droplets. When the pulse drive signal is turned off, the heater stops heating, the bubbles burst, and the pressure chamber becomes negatively pressurized. Liquid then replenishes the pressure chamber 22 through the ink inlet channel 24.

[0004] However, in Figure 1In the illustrated thermal bubble inkjet printhead structure, each pressure chamber 22 is enclosed on three sides and has only a single liquid inlet channel 24, preventing liquid from circulating within the pressure chamber 22. When the printhead or jetting unit is not in use, the liquid surface at the nozzle 32, which is in contact with the outside air, can easily dry out and clog the nozzle due to liquid evaporation. Furthermore, residual bubbles and particle precipitation within the pressure chamber 22 can lead to jetting failure. Summary of the Invention

[0005] The technical problem solved by the present invention is: how to achieve sustainable flow of liquid inside the inkjet print head, so as to keep the nozzle moist through continuous flow of liquid, while taking away residual bubbles and particle precipitation in the nozzle flow channel, increasing the particle solid content of the sprayable liquid, and extending the service life of the nozzle.

[0006] The present application discloses an inkjet print head, which includes an inkjet unit, an ink inlet channel and an ink outlet channel. The inkjet unit includes a nozzle, a pressure chamber and a heater. The nozzle is located above the pressure chamber, and the heater is located below the pressure chamber. The ink inlet channel and the ink outlet channel are respectively connected to the pressure chamber. The pressure of the ink inlet channel is positive, and the pressure of the ink outlet channel is negative.

[0007] Optionally, an ink inlet and an ink outlet are provided on a side wall of the pressure chamber, the ink inlet is communicated with the ink inlet channel, and the ink outlet is communicated with the ink outlet channel.

[0008] Optionally, the size of the ink inlet decreases along the direction of the ink inlet channel toward the pressure chamber.

[0009] Optionally, the inkjet unit further comprises a filter, which is arranged at the ink inlet and is used to prevent large particles in the liquid from flowing into the pressure chamber and clogging the nozzle.

[0010] Optionally, the inkjet unit further includes a flow restrictor, which is arranged at the ink outlet to slow down the rapid flow of liquid toward the ink outlet under the pressure of the bubble when the bubble in the pressure chamber expands, so as to ensure that the pressure in the pressure chamber is sufficient to push the ink out of the nozzle.

[0011] Optionally, in the flow direction of the ink in the pressure chamber, the ink inlet and the ink outlet are respectively located on opposite sides of the heater.

[0012] Optionally, the inkjet unit further comprises a nozzle disposed at the top of the pressure chamber, and in the flow direction of the ink in the pressure chamber, the ink inlet and the ink outlet are respectively located on opposite sides of the nozzle.

[0013] Optionally, there are multiple inkjet units, and the multiple inkjet units are arranged in two columns. There are two ink outlet channels, and the inkjet units in one column are located between the ink inlet channel and one of the ink outlet channels, and the inkjet units in the other column are located between the ink inlet channel and the other ink outlet channel.

[0014] Optionally, there are multiple inkjet units, and the multiple inkjet units are arranged in two columns and staggered in the row direction. There are two ink outlet channels, and the inkjet units in one column are located between the ink inlet channel and one of the ink outlet channels, and the inkjet units in the other column are located between the ink inlet channel and the other ink outlet channel.

[0015] The present application also discloses an inkjet printing device, which includes the above-mentioned inkjet print head.

[0016] The present invention discloses an inkjet print head and an inkjet printing device, which have the following technical effects:

[0017] The ink inlet channel and the ink outlet channel are connected to the pressure chamber of the inkjet unit respectively. The ink continuously flows from the ink inlet channel into the pressure chamber below the nozzle, and flows out from the ink outlet channel after passing through the pressure chamber, thereby taking away any bubbles and particle sediments that may remain in the flow channel of the inkjet print head, while keeping the nozzle moist to avoid drying and clogging of the nozzle hole, ultimately improving the jetting ability of the inkjet print head and extending the service life of the inkjet print head. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of a thermal bubble inkjet print head in the prior art;

[0019] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of a single injection unit;

[0020] Figure 3 is a top view of an inkjet print head according to embodiment 1 of the present invention;

[0021] Figure 4 for Figure 3 A schematic cross-sectional structure diagram of two inkjet units;

[0022] Figure 5A 、 Figure 5B 、 Figure 5C Schematic diagram of the ink flow process during an inkjet cycle in Example 1 of the present invention;

[0023] Figure 6 is another top view of the inkjet print head according to the first embodiment of the present invention;

[0024] Figure 7Schematic diagram of the arrangement of nozzles on the nozzle plate of Example 1 of the present invention;

[0025] Figure 8 FIG. 1 is another schematic diagram of the arrangement of nozzles on the nozzle plate according to the first embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] Before describing the various embodiments of the present application in detail, the technical concept of the present application is briefly described first: In the prior art, the pressure chamber structure of a hot bubble inkjet print head is relatively closed. Usually, after the ink enters the pressure chamber from the liquid inlet, it is heated by a heater and then ejected from the nozzle. There may be residual bubbles and deposited particles in the pressure chamber, which affects the inkjet effect. At the same time, when the nozzle or the ejection unit is not in use, the liquid surface at the nozzle that is in contact with the outside air is prone to dryness and clogging due to liquid volatilization, causing nozzle failure. To this end, the inkjet print head provided by the present application is provided with an ink inlet channel and an ink outlet channel, and the ink inlet channel and the ink outlet channel are respectively connected to the pressure chamber of the inkjet unit, and the pressure of the ink inlet channel is positive and the pressure of the ink outlet channel is negative, so that the ink can continuously flow from the ink inlet channel into the pressure chamber below the nozzle, and flow out from the ink outlet channel after passing through the pressure chamber, thereby taking away any bubbles and particle precipitation that may remain in the flow channel of the inkjet print head, while keeping the nozzle moist, avoiding nozzle drying and clogging, thereby improving the ejection ability of the inkjet print head and extending the service life of the inkjet print head.

[0028] Specifically, if Figure 3 As shown, the inkjet print head of the first embodiment includes an inkjet unit 100, an ink inlet channel 200 and an ink outlet channel 300. The inkjet unit 100 includes a nozzle 103, a pressure chamber 101 and a heater 102. The nozzle 103 is arranged at the top of the pressure chamber 101, and the heater 102 is arranged at the bottom of the pressure chamber 101. The ink inlet channel 200 and the ink outlet channel 300 are respectively connected to the pressure chamber 101.

[0029] For example, the number of inkjet units 100 of the inkjet print head is usually multiple, such as Figure 3 In the top view shown, there are six inkjet units 100, which are arranged in two columns and three rows. The ink inlet channel 200 is located between the two columns of inkjet units 100, and the two ink outlet channels 300 are respectively arranged on the outside of the two columns of inkjet units 100. Figure 4In the cross-sectional view shown, there are two inkjet units 100 arranged in a row. The sizes and specifications of the inkjet units 100 may be the same or different. It should be noted that the improvement of this first embodiment focuses on how to achieve ink flow within the pressure chamber. The number of inkjet units 100 and the differences between the inkjet units 100 are not specifically limited and will not be described in detail. The following description uses one of the inkjet units 100 as an example.

[0030] Specifically, if Figure 3 and Figure 4 As shown, the inkjet print head also includes a substrate 700 and a multilayer thin film structure 400 arranged on the substrate 700. The substrate 700 is generally made of silicon or other suitable materials, and the ink inlet channel 200 and the ink outlet channel 300 pass through the substrate 700. The multilayer thin film structure 400 includes a dedicated integrated circuit layer 401, a wire layer 402, and a passivation layer 403. The wire layer 402 can be made of a metal material, such as Al or Al alloy, Au, Ag and other thin films, which are deposited on the heater 102 and patterned through processes such as photolithography and etching to form conductive leads, connecting the heater to the external circuit. The passivation layer 403, such as a silicon nitride or silicon oxide film, is deposited on the conductive leads and the heater to protect the underlying metal from insulation from the liquid flow channel.

[0031] The heater 102 is arranged between the dedicated integrated circuit layer 401 and the wire layer 402. The heater 102 can be made of TaAl, TaN, TiN or other appropriate high-resistance materials. The heater structure is formed through a series of processing processes such as thin film deposition, photolithography, and etching, and is electrically connected to the integrated circuit layer 401 and the wire layer 402.

[0032] A pressure chamber layer 500 and a nozzle plate 600 covering the pressure chamber layer 500 are provided on the multilayer thin film structure 400. The pressure chamber layer 500 can be made of one of the materials such as epoxy resin SU-8, polyimide, silicon oxide or electroplated Ni after patterning. The nozzle layer 600 can also be made of one of the materials such as epoxy resin SU-8, polyimide, silicon oxide or electroplated Ni after patterning. The multilayer thin film structure 400, the pressure chamber layer 500 and the nozzle plate 600 together form the pressure chamber 101 of the inkjet unit 100. The heater 102 is located below the pressure chamber 101. For example, the heater 102 is located directly below the pressure chamber 101. A through hole is opened on the nozzle plate 600, which serves as the nozzle 103 of the inkjet unit 100, wherein the nozzle 103 and the heater 102 can be completely opposite, partially opposite or not opposite at all. Figure 3The nozzle plate 600 is omitted and the position of the nozzle 103 is shown. A protective layer 104 can also be provided at the bottom of the pressure chamber 101. The protective layer 104 can be made of a corrosion-resistant metal film such as Ta. The protective layer 104 prevents the ink from damaging the multilayer thin film structure 400. Furthermore, a continuous channel is formed between the substrate 700 and the multilayer thin film structure 400, which serves as the ink inlet channel 200 and the ink outlet channel 300.

[0033] Furthermore, an ink inlet 101a and an ink outlet 101b are provided on the side wall of the pressure chamber 101. The ink inlet 101a is connected to the ink inlet channel 200, and the ink outlet 101b is connected to the ink outlet channel 300. Figure 3 、 Figure 4 As shown in Figure 5, during an inkjet cycle, ink in the ink inlet channel 200 enters the pressure chamber 101 through the ink inlet port 101a on the side wall. Heater 102 operates, instantly heating up and vaporizing the ink near heater 102, generating bubbles. The expansion of the bubbles increases the hydraulic pressure within the pressure chamber 101, and the ink directly below the nozzle 103 is pushed by the bubble pressure and ejected along the nozzle 103. After heater 102 stops heating, the ink is ejected from nozzle 103 as droplets. The bubbles in the pressure chamber 101 burst, creating a negative pressure in the pressure chamber 101, and ink automatically replenishes the pressure chamber from the ink inlet channel 200. Once the ink in the pressure chamber 101 is replenished, the liquid forms a stable meniscus at the nozzle, completing a jetting cycle. As the ink enters the pressure chamber 101, due to its fluidity, any remaining bubbles or particles in the pressure chamber 101 can be flushed out to the ink outlet 101b. The flowing ink also removes some of the residual heat from the heater 102, providing a cooling effect. After a jetting cycle is completed, the ink that continues to flow under the nozzle under the push of external pressure can keep the nozzle moist, avoiding nozzle drying and clogging due to liquid volatilization.

[0034] For the sake of Figure 5A 、 Figure 5B 、 Figure 5C In this way, the ink in the nozzle is kept flowing steadily, and the pressure of the ink inlet channel 200 and the ink outlet channel 300 can be controlled. Generally speaking, when the on-demand nozzle is not spraying liquid, a slight negative pressure is maintained under the nozzle to prevent the ink from flowing out of the nozzle when not spraying. Therefore, the pressure P in the ink inlet channel 200 is in It can be set to positive pressure, the pressure P in the ink outlet channel 300 out It can be set to negative pressure, and the difference between the two keeps a slight negative pressure below the nozzle 103. On the one hand, it maintains the circulation of ink and takes away bubbles or particle precipitation that affect the injection. On the other hand, it can also maintain the injection ability of the nozzle.

[0035] Illustratively, in the flow direction of the ink in the pressure chamber 101, the ink inlet 101a and the ink outlet 101b are respectively located on opposite sides of the heater 102 and / or the nozzle 103, that is, the ink inlet 101a and the ink outlet 101b are arranged opposite each other at this time, so that the flow path is as short as possible, which is conducive to improving the fluidity of the ink in the pressure chamber 101 and taking away the bubbles or particles remaining in the pressure chamber 101.

[0036] Furthermore, since the expansion of bubbles will also cause part of the ink in the pressure chamber 101 to enter the ink outlet channel 300, in order to minimize the ink flowing out of the ink outlet 101b, reduce the pressure loss in the pressure chamber, and allow more ink to be ejected from the nozzle 103 to improve the energy conversion efficiency, a flow limiter 105 is set at the ink outlet 101b without affecting the ink supply flow of the nozzle, so as to limit the liquid in the pressure chamber from flowing rapidly to the ink outlet 101b, so as to reduce the ink flowing to the ink outlet channel 300.

[0037] For example, Figure 3 As shown, the flow restrictor 105 is a columnar structure, and the area of ​​the first side of the flow restrictor 105 is larger than the area of ​​the second side, wherein the first side is the side of the flow restrictor 105 close to the pressure chamber 101, and the second side is the side of the flow restrictor 105 away from the pressure chamber 101. The first side of the flow restrictor 105 can effectively block the bubbles generated during the heating process. At the same time, the two side surfaces connected to the second side surface of the flow restrictor 105 are inclined surfaces, which is conducive to blocking the ink in the ink outlet channel 300 from flowing back to the pressure chamber 101. There are gaps between the two sides of the flow restrictor 105 and the pressure chamber layer 500 to prevent the flow restrictor 105 from completely blocking the ink outlet 101b. The second side surface of the flow restrictor 105 gradually shrinks along the direction of liquid circulation flow to prevent the ink from being stationary near the flow restrictor, which is not conducive to carrying away bubbles or particles and thus affecting the injection effect.

[0038] In another embodiment, the flow restrictor 105 may also be Figure 6 The two trapezoidal columns shown are respectively connected to the pressure chamber layer 500, and the two trapezoidal columns are spaced apart to form a gap. The trapezoidal columns can be used to block bubbles generated during the heating process, and the gap can also be used to allow the flowing ink to pass through. At the same time, due to the inclined surface of the two trapezoidal columns, the size of the gap decreases along the direction from the ink outlet channel 300 to the pressure chamber 101, which helps prevent the ink in the ink outlet channel 300 from flowing back to the pressure chamber 101. It should be pointed out that the structure of the flow restrictor 105 can also be other. The structures of the flow restrictor 105 that are similar, equivalent, and can perform the above two functions are all within the scope of protection of this application.

[0039] Similarly, since the bubble expands during the heating process, it also pushes part of the ink in the pressure chamber 101 to the ink inlet 101a. In order to prevent the bubble from flowing out of the ink inlet 101a, the size of the ink inlet 101a is reduced to ensure that the flow rate of the ink meets the high-frequency ejection requirement. Exemplarily, the size of the ink inlet 101a decreases in the direction of the ink inlet channel 200 pointing to the pressure chamber 101. As one of the ways, two trapezoidal columns can be arranged on the side wall of the pressure chamber layer 500, so that the size of the ink inlet 101a is larger at one end and smaller at the other end.

[0040] Further, the inkjet unit further comprises a filter 106 arranged at the ink inlet 101a, which is used to prevent large particles in the ink from the ink inlet channel from entering the pressure chamber and blocking the nozzle. The filter 106 can have one or more columns arranged vertically at the ink inlet 101a.

[0041] Further, the plurality of inkjet units 100 are arranged in two columns and multiple rows, and the number of ink outlet channels 300 is two. One column of inkjet units 100 is located between the ink inlet channel 200 and one of the ink outlet channels 300, and the other column of inkjet units 100 is located between the ink inlet channel 200 and the other ink outlet channel 300. As shown in FIG. 1, the nozzles 103 of the two inkjet units 100 in the row direction are located in the same row. Figure 7

[0042] Exemplarily, in another embodiment, the plurality of inkjet units 100 are arranged in two columns and the inkjet units 100 are staggered in the row direction. The number of ink outlet channels 300 is two. One column of inkjet units 100 is located between the ink inlet channel 200 and one of the ink outlet channels 300, and the other column of inkjet units 100 is located between the ink inlet channel 200 and the other ink outlet channel 300. As shown in FIG. 2, the nozzles 103 of the plurality of inkjet units 100 are arranged in two columns and staggered in the row direction, i.e., in the row direction, the two nozzles 103 are not located in the same row. Figure 8

[0043] ​​This embodiment 2 also discloses an inkjet printing device, which includes the inkjet print head in embodiment 1. The inkjet printing device can remove the local heat accumulation of the device through liquid circulation during use, improve the uniformity of the temperature distribution of the device, and extend the service life of the nozzle. The liquid circulation flow removes the residual bubbles and particles inside the flow channel, improving the injection effect. At the same time, when not working, the liquid circulation can also be used to maintain the wettability at the nozzle to avoid nozzle clogging, and can also improve the uniformity of the liquid viscosity distribution in the channel. It should be noted that it is understandable that a complete inkjet printing device should also have other necessary basic components, but the other components are not the focus of this embodiment, so they are not shown in the figure and are not described in detail in the specification, and these components are well-known technologies to those skilled in the art.

[0044] The above describes in detail the specific implementation methods of the present invention. Although some embodiments have been shown and described, those skilled in the art should understand that these embodiments can be modified and improved without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents. These modifications and improvements should also be within the scope of protection of the present invention.

Claims

1. An inkjet print head, characterized in that: The inkjet print head includes an inkjet unit, an ink inlet channel and an ink outlet channel. The inkjet unit includes a nozzle, a pressure chamber and a heater. The nozzle is located above the pressure chamber, and the heater is located below the pressure chamber. The ink inlet channel and the ink outlet channel are connected to the pressure chamber respectively. The pressure of the ink inlet channel is positive pressure, and the pressure of the ink outlet channel is negative pressure. An ink inlet and an ink outlet are provided on the side wall of the pressure chamber. The ink inlet is connected to the ink inlet channel, and the ink outlet is connected to the ink outlet channel. In the direction of the ink inlet channel pointing to the pressure chamber, the ink The size of the ink inlet decreases gradually; the inkjet unit also includes a flow restrictor, which is arranged at the ink outlet, and is used to slow down the rapid flow of liquid toward the ink outlet under the pressure of the bubble when the bubble in the pressure chamber expands, so as to ensure that the pressure in the pressure chamber is sufficient to push the ink out of the nozzle; the flow restrictor is a columnar structure, and the area of ​​the first side of the flow restrictor is larger than the area of ​​the second side, wherein the first side is the side of the flow restrictor close to the pressure chamber, and the second side is the side of the flow restrictor away from the pressure chamber, and the two side surfaces of the flow restrictor connected to the second side are inclined surfaces.

2. An inkjet print head, characterized in that: The inkjet print head includes an inkjet unit, an ink inlet channel and an ink outlet channel. The inkjet unit includes a nozzle, a pressure chamber and a heater. The nozzle is located above the pressure chamber, and the heater is located below the pressure chamber. The ink inlet channel and the ink outlet channel are connected to the pressure chamber respectively. The pressure of the ink inlet channel is positive pressure, and the pressure of the ink outlet channel is negative pressure. An ink inlet and an ink outlet are provided on the side wall of the pressure chamber. The ink inlet is connected to the ink inlet channel, and the ink outlet is connected to the ink outlet channel. In the direction of the ink inlet channel pointing to the pressure chamber, the ink inlet The size of the ink decreases gradually; the inkjet unit also includes a flow restrictor, which is arranged at the ink outlet, and is used to slow down the rapid flow of liquid toward the ink outlet under the pressure of the bubble when the bubble in the pressure chamber expands, so as to ensure that the pressure in the pressure chamber is sufficient to push the ink out of the nozzle; the flow restrictor is composed of two trapezoidal cylinders, and the two trapezoidal cylinders are arranged at intervals to form a gap, the trapezoidal cylinders are used to block the bubbles generated during the heating process, and the gap is used for the flowing ink to pass through, and the size of the gap between the inclined surfaces of the two trapezoidal cylinders decreases gradually in the direction along the ink outlet channel to the pressure chamber.

3. The inkjet print head according to claim 1 or 2, characterized in that: The inkjet unit further includes a filter, which is arranged at the ink inlet and is used to prevent large particles in the liquid from flowing into the pressure chamber and clogging the nozzle.

4. The inkjet print head according to claim 1 or 2, characterized in that: In the flow direction of ink in the pressure chamber, the ink inlet and the ink outlet are respectively located on opposite sides of the heater.

5. The inkjet print head according to claim 1 or 2, characterized in that: The inkjet unit further includes a nozzle disposed at the top of the pressure chamber. In the flow direction of ink in the pressure chamber, the ink inlet and the ink outlet are respectively located on opposite sides of the nozzle.

6. The inkjet print head according to claim 1 or 2, characterized in that: There are multiple inkjet units, and the multiple inkjet units are arranged in two columns and multiple rows. There are two ink outlet channels, and the inkjet units in one column are located between the ink inlet channel and one of the ink outlet channels, and the inkjet units in the other column are located between the ink inlet channel and the other ink outlet channel.

7. The inkjet print head according to claim 1 or 2, characterized in that: There are multiple inkjet units, and the multiple inkjet units are arranged in two columns and staggered in the row direction. There are two ink outlet channels, and the inkjet units in one column are located between the ink inlet channel and one of the ink outlet channels, and the inkjet units in the other column are located between the ink inlet channel and the other ink outlet channel.

8. An inkjet printing device, characterized in that: The inkjet print head according to claim 1 or 2.

Images