Ink-jet printing device

[0021] As mentioned in the background art, the prior art has technical problems of low inkjet printing efficiency and uneven thickness of the inkjet printing film. The inventor discovered through research that the reason for this problem is that due to the limitation of the position and number of the nozzles, ink droplets need to spread from the middle area of ​​the substrate to be inkjetted to the edge area of ​​the substrate to be inkjetted. Diffusion of ink droplets takes time, which affects printing efficiency; the diffusion path of ink droplets is uncontrollable. After film formation, the thickness of the film at the edge of the substrate to be inkjet is smaller than the film thickness at the start of the diffusion, and the film thickness is uneven. In an inkjet process, the larger the inkjet volume of a nozzle, the longer the ink droplet diffusion time, the lower the printing efficiency; the more uncontrollable the diffusion, the more uneven the film thickness. In addition, the position of the nozzle is fixed, the diffusion area is fixed, and the diffusion time is limited, which affects the printing efficiency and the uniformity of the film thickness.

[0022] In order to solve the above-mentioned problems, the inventors discovered that by providing multiple nozzles, the amount of ink ejected in one inkjet process is distributed to multiple nozzles. The inkjet volume of each nozzle becomes smaller, the ink droplet diffusion time becomes shorter, and the ink droplet diffusion area becomes smaller, which improves inkjet printing efficiency and inkjet printing film thickness uniformity. The driving mechanism drives the nozzle to move along a preset trajectory, so that the nozzle moves while injecting ink, and the diffusion center of the ink droplets on the substrate to be ejected also moves with the nozzle. Ink droplets spread out from multiple points to improve the thickness uniformity of the inkjet printing film. The farther the nozzle head is from the center of the substrate to be ejected, the greater the angle of inclination from the vertical direction to the center of the substrate to be ejected. By setting the nozzle in this way, the thickness uniformity of the inkjet printing film is further improved.

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0024] figure 1 Shown is a schematic structural diagram of an inkjet printing device provided by an embodiment of the present invention. Such as figure 1 As shown, the inkjet printing device includes: a plurality of nozzles 1, which are configured to perform inkjet printing on a substrate 2 to be inkjet; and a plurality of driving mechanisms 3 corresponding to the plurality of nozzles 1, and the driving mechanism 3 is configured to drive The nozzle 1 moves along a preset trajectory; wherein, the farther the nozzle 1 is from the center of the substrate 2 to be ejected, the greater the tilt angle of the nozzle 1 from the vertical direction to the center of the substrate 2 to be ejected.

[0025] In the embodiment of the present invention, by providing a plurality of nozzles 1, the inkjet amount in one inkjet process is distributed to the plurality of nozzles 1. The ink ejection volume of each nozzle 1 becomes smaller, the ink droplet diffusion time becomes shorter, and the ink droplet diffusion area becomes smaller, which improves inkjet printing efficiency and inkjet printing film thickness uniformity. The driving mechanism 3 drives the nozzle 1 to move along a preset trajectory, so that the nozzle 1 ejects while moving, and the diffusion center of the ink droplets on the substrate 2 to be inkjet also moves with the nozzle 1. Ink droplets spread out from multiple points to improve the thickness uniformity of the inkjet printing film.

[0026] The farther the nozzle 1 is from the center of the substrate 2 to be ejected, the greater the tilt angle from the vertical direction to the center of the substrate 2 to be ejected. The ink droplets ejected from the nozzle 1 located in the center of the substrate 2 to be ejected need to be spread around, and the ink droplets are spread as much as possible to the surrounding area. Therefore, the nozzle 1 located in the center of the substrate 2 to be inkjet is sprayed from the vertical direction The angle at which the center of the ink substrate 2 is inclined is 0 degrees. The ink droplets ejected from the nozzle 1 located at the edge area of ​​the substrate 2 to be ejected need to spread to the side close to the center of the substrate 2 to be ejected, and to reduce the spread to the side away from the center of the substrate 2 to be ejected. The nozzle head 1 compensates for the angle to balance the unevenness of the ink drop spread on both sides. Therefore, the farther the nozzle head 1 is from the center of the substrate 2 to be ejected, the greater the tilt angle from the vertical direction to the center of the substrate 2 to be ejected. By providing the nozzle 1 in this way, the uniformity of inkjet printing is further improved.

[0027] It should be understood that the number of nozzles 1 in the inkjet device only needs to be greater than one, and the embodiment of the present invention does not specifically limit the number of nozzles 1 in the inkjet device. Multiple nozzles 1 can be as figure 1 The arrangement shown is in a row, can also be arranged in an array, and can also be arranged in a circle. The embodiment of the present invention does not limit the specific arrangement of the multiple nozzles 1. The driving mechanism 3 may be driven by a motor, and the embodiment of the present invention does not specifically limit the specific implementation of the driving mechanism 3.

[0028] It should also be understood that the preset trajectory is related to the shape of the substrate 2 to be ejected and the arrangement of the multiple nozzles 1. For example, the substrate 2 to be ejected is rectangular, and the plurality of nozzles 1 are arranged in a row, and the preset track may be a movement track from one side of the substrate 2 to be ejected to the other side of the substrate 2 to be ejected. The substrate 2 to be jetted is circular, and the plurality of nozzles 1 are arranged in a circular shape. The preset trajectory may be a movement trajectory from the center of the substrate 2 to be ejected to the edge of the substrate 2 to be inkjet, or a movement trajectory from the edge of the substrate 2 to be inkjet to the center of the substrate 2 to be inkjet. The preset trajectory is not limited to the above situation, and the preset trajectory can be set according to the requirements of specific application scenarios. The embodiment of the present invention does not limit the specific form of the preset trajectory.

[0029] In one embodiment, the farther the nozzle 1 is from the center of the substrate 2 to be ejected, the smaller the ejection amount of the nozzle 1. In order to precisely control the inkjet volume of inkjet printing, the inkjet volume of each nozzle 1 can be different. The farther the nozzle 1 is from the center of the substrate 2 to be inkjetted, the smaller the area where the ink droplets need to be diffused. Especially for the nozzlehead 1 located at the edge of the substrate 2 to be inkjetted, the ink droplets only need to diffuse on one side. Therefore, the farther the nozzle 1 is from the center of the substrate 2 to be ejected, the smaller the ejection amount of the nozzle 1. This configuration can further improve the uniformity of the inkjet printing film thickness.

[0030] In one embodiment, a plurality of spray heads 1 are distributed in an array. The plurality of nozzles 1 distributed in an array can not only improve inkjet printing efficiency, save inkjet printing time, but also ensure the uniformity of the inkjet printing film thickness.

[0031] It should be understood that the array arrangement can be an array arrangement of 5 rows and 5 columns; it can be an array arrangement of 1 row and 5 columns; it can be an array arrangement of 5 rows and 1 column; it can be an array arrangement of 2 rows and 5 columns. , It can also be arranged in an array of 4 rows and 5 columns. As long as the plurality of nozzles 1 are distributed in an array, the embodiment of the present invention does not limit the specific form of the array.

[0032] figure 2 Shown is a schematic structural diagram of an inkjet printing device provided by an embodiment of the present invention. image 3 Shown is a schematic structural diagram of an inkjet printing device provided by an embodiment of the present invention. Such as figure 2 versus image 3 As shown, the inkjet printing device further includes: at least one connecting rod 4. A plurality of spray heads 1 distributed in an array is divided into at least one spray head group; the connecting rod 4 is configured to connect a plurality of spray heads 1 in the spray head group; the driving mechanism 3 is further configured to drive the connecting rod 4 to move along a preset track.

[0033] In the embodiment of the present invention, a plurality of spray heads 1 distributed in an array are divided into at least one spray head group and connected to a plurality of spray heads 1 in the spray head group through a connecting rod 4, and the driving mechanism 3 drives the connecting rod 4 to drive the spray heads in the spray head group 1Move along a preset trajectory. The connection of the connecting rod 4 can ensure that a plurality of nozzles 1 in a nozzle group move together and have a consistent movement track. Rows of nozzles 1 can eject together, which can improve the printing efficiency of inkjet printing. At the same time, since the movement tracks of the multiple nozzles 1 are consistent, the thickness uniformity of the inkjet printing film is further improved.

[0034] It should be understood that when the array is arranged in an array of 1 row and 5 columns, multiple nozzles 1 can be divided as figure 2 Said one nozzle group. The division of different nozzle groups is determined according to the arrangement of different arrays, and the specific division of nozzle groups is not limited in the embodiment of the present invention. The number of connecting rods 4 should be the same as the number of nozzle groups, and each connecting rod 4 is connected to a nozzle group. The number of connecting rods 4 is determined according to the number of nozzle groups, and the embodiment of the present invention does not limit the specific number of connecting rods 4.

[0035] It should also be understood that the connecting rod 4 only needs to be able to connect multiple nozzles 1 in the nozzle group, and the embodiment of the present invention does not limit the specific form of the connecting rod 4 and the specific connection manner of the connecting rod 4 and the nozzle 1. The driving mechanism 3 can be as figure 2 As shown, a plurality of nozzles 1 in the nozzle group respectively correspond to each other, so as to converge to one connecting rod 4 together. Can also be like image 3 As shown, a driving mechanism 3 drives a connecting rod 4 to drive a plurality of spray heads 1 on a connecting rod 4. The embodiment of the present invention does not limit the specific connection mode and specific driving mode of the driving mechanism 3 and the connecting rod 4.

[0036] Figure 4 Shown is a schematic structural diagram of an inkjet printing device provided by an embodiment of the present invention. Such as Figure 4 As shown, at least one nozzle group includes a first nozzle group and a second nozzle group; at least one connecting rod 4 includes: a first connecting rod 4'and a second connecting rod 4"; at least one driving mechanism 3 includes: a first driving mechanism 3'and the second drive mechanism 3". The first connecting rod 4'is configured to connect the plurality of nozzles 1 in the first nozzle group; the second connecting rod 4" is configured to connect the plurality of nozzles 1 in the second nozzle group; the first driving mechanism 3'is configured to drive the first nozzle A connecting rod 4'moves from one side of the substrate to be ejected to the middle of the substrate to be ejected, and the second driving mechanism 3" is configured to drive the second connecting rod 4" from the other side of the substrate to be ejected to the substrate to be ejected. The middle movement of the substrate; or, the first driving mechanism 3'is configured to drive the first connecting rod 4'from the middle of the substrate to be ejected to one side of the substrate; the second driving mechanism 3" is configured to drive the second The connecting rod 4" moves from the middle of the substrate to be ejected to the other side of the substrate to be ejected.

[0037] The first connecting rod and the second connecting rod are respectively driven by the first driving mechanism 3'and the second driving mechanism 3", so that the first nozzle group and the second nozzle group move together from both sides of the substrate to be ejected to the middle, or Work together from the middle of the substrate to be inkjet to both sides, and the joint movement of the two directions can effectively save printing time and improve printing efficiency.

[0038] In another embodiment, at least one nozzle group includes a third nozzle group, a fourth nozzle group, a fifth nozzle group, and a sixth nozzle group; at least one connecting rod includes: a third connecting rod, a fourth connecting rod, and a fifth Connecting rod and sixth connecting rod; at least one driving mechanism includes: a third driving mechanism, a fourth driving mechanism, a fifth driving mechanism, and a sixth driving mechanism. The third connecting rod is configured to connect the plurality of nozzles 1 in the third nozzle group; the fourth connecting rod is configured to connect the plurality of nozzles 1 in the fourth nozzle group; the fifth connecting rod is configured to connect the plurality of nozzles in the fifth nozzle group. A nozzle 1; the sixth connecting rod is configured to connect a plurality of nozzles 1 in the sixth nozzle group. The third driving mechanism is configured to drive the third connecting rod to move from the side of the substrate 2 to be ejected to the first preset position, and the fourth driving mechanism is configured to drive the fourth connecting rod from the middle of the substrate to be ejected 2 to the first preset position. The fifth drive mechanism is configured to drive the fifth connecting rod to move from the middle of the substrate 2 to be ejected to the second preset position; the sixth drive mechanism is configured to drive the sixth connecting rod to eject the ink from the The other side of the base plate 2 moves to the second preset position. The first preset position is one quarter away from the side of the substrate 2 to be ejected, and the second preset position is one quarter away from the side of the substrate 2 to be ejected. Three positions of the substrate 2 to be jetted.

[0039] It should be understood that the number of connecting rods 4, the number of driving mechanisms 3, and the motion trajectory of the group of spray heads 1 driven by the connecting rod 4 are not limited to those in the above embodiments, and the embodiments of the present invention will not be repeated one by one.

[0040] Figure 5 Shown is a schematic structural diagram of an inkjet printing device provided by an embodiment of the present invention. Such as Figure 5 As shown, the inkjet printing device further includes: a plurality of sliding driving mechanisms 6 corresponding to the plurality of nozzles 1 one-to-one, and the sliding driving mechanism 6 is configured to drive the nozzles 1 to slide on the connecting rod 4. The arrangement of the sliding drive mechanism 6 can ensure that the nozzle 1 moves on the connecting rod 4, avoid inkjet dead ends, and improve the accuracy of inkjet printing and the uniformity of the thickness of the inkjet printing film.

[0041] In a further embodiment, the sliding drive device is integrated in the drive device. This arrangement can reduce space and save materials.

[0042] In one embodiment, such as Figure 5 As shown, it also includes: at least one controller 5 electrically connected to at least one driving mechanism 3, the controller 5 is used to send a speed control instruction; the driving mechanism 3 is further configured to drive the connecting rod 4 at a preset speed according to the speed control instruction Move along the preset trajectory. In the embodiment of the present invention, the moving speed of the connecting rod 4 is controlled to control the relative residence time of the nozzle group 1 at different positions of the substrate 2 to be inkjetted, thereby controlling the inkjet amount at different positions of the substrate 2 to be inkjetted. Realize precise control of inkjet volume for inkjet printing.

[0043] It should be understood that as long as the controller 5 can send a speed control command to the driving mechanism 3, the embodiment of the present invention does not limit the specific implementation form of the controller 5.

[0044] Image 6 Shown is a schematic structural diagram of an inkjet printing device provided by an embodiment of the present invention. Such as Image 6 As shown, the inkjet printing device further includes: charge-coupled positioning devices 7 respectively corresponding to the plurality of nozzles 1 for capturing the positioning of the nozzles 1. Only by capturing the position of the nozzle 1 and knowing that the nozzle 1 is located at the specific position of the substrate 2 to be ejected, can the inkjet volume of the nozzle 1 and the traveling speed of the nozzle 1 be set according to the position of the nozzle 1. Therefore, accurately obtaining the position of the nozzle 1 can effectively improve the accuracy of inkjet printing.

[0045] It should be understood that the CCD (Charge Coupled Device, charge coupled positioning device 7) only needs to be able to capture the position of the nozzle 1, and the embodiment of the present invention does not limit the specific implementation of the CCD.

[0046] In one embodiment, the inkjet printing device further includes a drying mechanism located on the side of the non-inkjet printing area of ​​the substrate 2 to be inkjetted, and is configured to dry the ink ejected by the nozzle 1. When the drying mechanism is drying the ink, the solvent evaporates and the film becomes thin and uniform. It not only improves the efficiency of inkjet printing, but also improves the uniformity of the film thickness of inkjet printing.

[0047] In one embodiment, the drying mechanism includes: a strip ultraviolet lamp. Ultraviolet lamps are a relatively common drying device, which is easy to obtain and easy to install.

[0048] The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. within.