A coding device and a combined nozzle thereof

Abstract

The present invention relates to a coding device and a combined nozzle thereof, wherein the combined nozzle comprises a first nozzle and a second nozzle capable of working simultaneously, wherein the deflection electric field of the first nozzle is opposite to the direction of the deflection electric field of the second nozzle, and when the target pattern is collaboratively printed, the intersection of the projection lines of the flight trajectories of the charged ink droplets used by the first nozzle and the second nozzle for printing the target pattern on a third plane is located on the projection line of the printing surface of the substrate on the third plane, so that each printing column constituting the target pattern can be completed simultaneously, wherein the third plane is perpendicular to the first plane and perpendicular to the second plane; the first plane is parallel to the printing surface, and the second plane is perpendicular to the moving direction of the substrate. The coding device and the combined nozzle thereof proposed by the present invention can complete each printing column constituting the target pattern simultaneously regardless of how the moving speed of the substrate changes, so the upper and lower parts of the target pattern can always be aligned left and right.

Description

Technical Field

[0001] The invention belongs to the technical field of industrial coding and inkjet printing, and in particular relates to a coding device and a combined nozzle thereof. Background Art

[0002] The inkjet printer is a computer-controlled, non-contact inkjet printer that prints on products. Figure 1 , Figure 1 The inkjet device shown includes a printhead, which includes a nozzle 1, a charging slot 2, a deflection electrode and a recovery slot 6. The deflection electrode includes a negative polarity deflection electrode 4 and a positive polarity deflection electrode 5. The nozzle 1 sprays out continuous and uniform ink droplets 3 at a certain pressure, and a deflection electric field is formed in the area between the negative polarity deflection electrode 4 and the positive polarity deflection electrode 5. When the inkjet device performs printing, under the control of a computer, the nozzle 1 sprays out continuous and uniform ink droplets 3 at a certain pressure, and the ink droplets 3 are charged or not charged when flying through the charging slot 2 at a certain speed; after passing through the charging slot 2, the ink droplets 3 continue to fly through the deflection electric field, wherein the charged ink droplets will deflect their flight trajectory when flying through the deflection electric field, and fall on the surface of the substrate 7 passing under the printhead at a certain moving speed, forming a specific pattern, for example Figure 2 The capital letter E shown; when the uncharged ink droplets fly through the deflection electric field, the flight trajectory will not be deflected and they will still fly in a straight line. The uncharged ink droplets will fall into the recovery groove 6 arranged just below the nozzle 1 and above the substrate 7, be recovered by the recovery groove 6, and re-enter the ink system without falling on the printing surface of the substrate 7.

[0003] When the inkjet printer performs printing, the computer uses the object to be printed as a sample and controls the inkjet printer to print various printing dots on the substrate 7, thereby printing a pattern corresponding to the object to be printed. Figure 2 As shown, the object to be printed is a capital letter E. The figure shows that the printing points of the pattern corresponding to the object to be printed include 4 columns and 5 rows, totaling 14 printing points. The number of rows and columns here is only an example.

[0004] Since the maximum printing height of each nozzle is limited (most current models of inkjet printers can only print 34 dots per column at most), when it is necessary to print a pattern with too many dots (for example, more than 34) in the vertical direction (i.e., in each column), two or more nozzles must work together to complete the task. Figure 3 When the target patterns of "E1" and "E2" are placed vertically as shown (in order to simplify the view, the target pattern in this example has only 18 print points per column), the first nozzle can print Figure 4a The "E1" part shown is printed by the second printhead Figure 4b The "E2" part shown. The specific method is to set two nozzles in front and behind along the moving direction of the substrate, one nozzle is set on the left side of the substrate's forward direction, and the other nozzle is set on the right side of the substrate's forward direction. When the substrate passes under the first nozzle, the "E1" part is printed, and then when it passes under the second nozzle, the "E2" part is printed.

[0005] Because the target pattern is formed by two nozzles printing a part of it respectively and then splicing it together, and the two nozzles are arranged in front and back along the moving direction of the substrate, so when co-printing the same pattern, Figure 3 The upper and lower parts (i.e. "E1" and "E2") of the target pattern shown are aligned left and right. An appropriate delay value must be set between the two nozzles based on the moving speed of the substrate. Otherwise, the upper and lower parts of the printed pattern will be misaligned left and right, such as Figure 5 However, to accurately compensate Figure 5 The misalignment shown in the figure must rely on accurate monitoring of the substrate moving speed. In actual applications, speed monitoring equipment cannot be installed in many cases, or the error of the speed monitoring equipment is too large, resulting in the following Figure 5 The target pattern shown is misaligned left and right between the upper and lower parts. Summary of the invention

[0006] In order to solve the technical problem that two respectively printed parts of the same pattern are misaligned left and right, an embodiment of the present invention provides a coding device and a combined nozzle thereof.

[0007] In one aspect of an embodiment of the present invention, a combination nozzle of a coding device is proposed, the combination nozzle comprising a first nozzle and a second nozzle that can work simultaneously, the deflection electric field of the first nozzle is opposite to the direction of the deflection electric field of the second nozzle, and when collaboratively printing a target pattern, the intersection of the projection lines of the flight trajectories of the charged ink droplets of the first nozzle and the second nozzle used to print the target pattern on a third plane is located on the projection line of the printing surface of the substrate on the third plane, so that each print column constituting the target pattern can be completed simultaneously, wherein the third plane is perpendicular to the first plane and to the second plane; the first plane is parallel to the printing surface, and the second plane is perpendicular to the moving direction of the substrate.

[0008] In some embodiments, the first nozzle and the second nozzle have the same structure and size, and the first nozzle and the second nozzle are arranged in a front-to-back arrangement along the moving direction of the substrate in opposite directions of 180°.

[0009] In some embodiments, the first nozzle and the second nozzle are arranged in a front-to-back arrangement along the moving direction of the substrate;

[0010] The first nozzle includes a first A-polarity deflection electrode and a first B-polarity deflection electrode;

[0011] The second nozzle includes a second A-polarity deflection electrode and a second B-polarity deflection electrode;

[0012] The A polarity and the B polarity are opposite polarities to each other;

[0013] The first B polarity deflection electrode and the second B polarity deflection electrode are arranged front and back along the moving direction of the substrate, the first A polarity deflection electrode and the second A polarity deflection electrode are respectively located on both sides separated by the first B polarity deflection electrode and the second B polarity deflection electrode, and the first B polarity deflection electrode is at least arranged corresponding to the first A polarity deflection electrode, and the second B polarity deflection electrode is at least arranged corresponding to the second A polarity deflection electrode.

[0014] In some embodiments, the first nozzle further includes a first recovery groove, the second nozzle further includes a second recovery groove, the first B polarity deflection electrode has a notch formed along the ink line direction of the first nozzle, and the first recovery groove is set corresponding to the notch of the first B polarity deflection electrode; the second B polarity deflection electrode has a notch formed along the ink line direction of the second nozzle, and the second recovery groove corresponds to the notch of the second B polarity deflection electrode.

[0015] In some embodiments, the notch of the first B polarity deflection electrode is a long strip-shaped notch whose projection on the second plane is narrow at the top and wide at the bottom, and the notch of the second B polarity deflection electrode is a long strip-shaped notch whose projection on the second plane is narrow at the top and wide at the bottom.

[0016] In some embodiments, the first nozzle further includes a third A-polarity deflection electrode, the third A-polarity deflection electrode is arranged correspondingly to the first B-polarity deflection electrode, and is located on the same side of the second A-polarity deflection electrode, and the third A-polarity deflection electrode and the second A-polarity deflection electrode are arranged front and back along the moving direction of the substrate; the second nozzle further includes a fourth A-polarity deflection electrode, the fourth A-polarity deflection electrode is arranged correspondingly to the second B-polarity deflection electrode, and is located on the same side of the first A-polarity deflection electrode, and the fourth A-polarity deflection electrode and the first A-polarity deflection electrode are arranged front and back along the moving direction of the substrate;

[0017] The first A-polarity deflection electrode and the fourth A-polarity deflection electrode are adjacent to and electrically insulated from each other, and the second A-polarity deflection electrode and the third A-polarity deflection electrode are adjacent to and electrically insulated from each other.

[0018] In some embodiments, the notch of the first B-polarity deflection electrode is opposite to the notch of the second B-polarity deflection electrode, and the first B-polarity deflection electrode and the second B-polarity deflection electrode are in zero-resistance contact with each other.

[0019] In some embodiments, adjacent projection boundaries of the flight trajectories of the charged ink droplets of the first nozzle and the second nozzle on the second plane are collinear or equidistantly spaced, and the areas within the projection boundaries do not overlap with each other; the projection boundary of the flight trajectory of the charged ink droplets on the second plane is the straight line portion of the flight trajectory of the charged ink droplets with the smallest deflection amplitude under the deflection electric field or the straight line portion of the flight trajectory of the charged ink droplets with the largest deflection amplitude under the deflection electric field.

[0020] In some embodiments, the projections of the virtual ejection points of the first nozzle and the second nozzle on the second plane coincide with each other;

[0021] Alternatively, the projections of the virtual ejection points of the first nozzle and the second nozzle on the second plane do not overlap, and the projections of the virtual ejection points of the first nozzle and the second nozzle on the second plane are both located on the collinear projection boundary, or the projections of the virtual ejection points of the first nozzle and the second nozzle on the second plane are spaced in a manner consistent with the equidistant interval;

[0022] The virtual ejection point of the nozzle represents the intersection point where the flight trajectory of a charged ink droplet with the smallest deflection amplitude of the nozzle and the flight trajectory of a charged ink droplet with the largest deflection amplitude intersect after the straight line portion under the deflection electric field is extended in the reverse direction.

[0023] In some embodiments, the first A polarity deflection electrode and the fourth A polarity deflection electrode are arranged in a manner to control the deflection electric field direction of the first nozzle, and the second A polarity deflection electrode and the third A polarity deflection electrode are arranged in a manner to control the deflection electric field direction of the second nozzle.

[0024] It can be understood that the above embodiments can be combined arbitrarily without affecting the implementation.

[0025] In another aspect of an embodiment of the present invention, a coding device is proposed, comprising a combined nozzle and a control unit as described in any of the preceding items, wherein the control unit divides a pattern to be printed on a printing surface of a substrate along a moving direction of the substrate to obtain sub-patterns to be printed, and allocates corresponding sub-patterns to be printed to the first nozzle and the second nozzle; the first nozzle and the second nozzle print the allocated sub-patterns under the control of the control unit.

[0026] Beneficial effects of the present invention: In the inkjet device and its combined nozzle proposed in the embodiment of the present invention, when the first nozzle and the second nozzle cooperate to print the target pattern, since the intersection of the projection lines of the flight trajectories of the charged ink droplets used by the first nozzle and the second nozzle to print the target pattern on the third plane is located on the projection line of the printing surface of the substrate on the third plane, no matter how the moving speed of the substrate changes, each print column constituting the target pattern is completed simultaneously, so the upper and lower parts of the target pattern are always aligned left and right.

[0027] Furthermore, the embodiments of the present invention make the projected boundaries of the flight trajectories of the charged ink droplets of the two nozzles printing adjacent sub-patterns on the second plane colinear or equidistant, while the areas within the projected boundaries do not overlap with each other, so that when the two nozzles printing adjacent sub-patterns print the endmost printing points at the joining positions of the adjacent sub-patterns, the flight trajectories of the charged ink droplets sprayed by the two nozzles printing the adjacent sub-patterns are parallel to each other in the straight line portion under the deflection electric field, even if the distance between the printing surface and the nozzles changes within a certain range due to factors such as the vibration of the equipment and the error in the size of the substrate, there will be no overlap or excessive spacing between the printed patterns of the two nozzles, so that the two parts of the same pattern printed separately are tightly joined with a good joining effect.

[0028] Furthermore, the embodiment of the present invention changes the existing combination mode of deflection electrodes consisting of a positive electrode and a negative electrode, by replacing one of the electrodes with two electrodes without changing the electrical polarity, and then being able to control the deflection direction of the deflection electric field by controlling the voltage applied to each electrode, without the need for any mechanical manipulation of the electrode, wherein only the direction of the electric field is deflected, rather than the electrode itself, and by controlling the deflection direction of the deflection electric field, not only the deformation of the printing pattern caused by different moving speeds of the substrate can be overcome, but also the deformation of the printing pattern caused by the forward and reverse directions (or round trip or reciprocating) of the substrate can be overcome, and further, in the case of collaborative printing of dual nozzles, by controlling the deflection electric field direction of each nozzle, the above-mentioned technical effect of overcoming deformation can also be achieved. Therefore, when the first nozzle and the second nozzle cooperate in printing, the intersection of the projection lines of the flight trajectories of the charged ink droplets used by the first nozzle and the second nozzle to print the target pattern on the third plane is located on the projection line of the printing surface of the substrate on the third plane, so that each printing column constituting the target pattern is completed at the same time, no matter how the moving speed of the substrate changes, the upper and lower parts of the target pattern are always aligned left and right, and the defect of pattern deformation can be overcome. In addition, the combined nozzle and the inkjet device proposed in the embodiment of the present invention can automatically control the direction of the electric field in real time. Furthermore, the combined nozzle and the inkjet device proposed in the embodiment of the present invention adjust the direction of the deflection electric field in real time based on the different moving speeds of the substrate, so that even if the moving speed of the substrate changes significantly, or the moving direction is opposite, the printed pattern can be free of obvious deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The structural schematic diagram of the existing inkjet printer is shown;

[0030] Figure 2 A schematic diagram showing the printing effect of a capital letter E printed by an existing inkjet coding device;

[0031] Figure 3 A schematic diagram showing the expected printing effect of the existing coding device printing the target patterns of "E1" and "E2" placed vertically;

[0032] Figure 4a and Figure 4b The two nozzles are shown separately. Figure 3 A schematic diagram of a portion of the pattern shown;

[0033] Figure 5 A schematic diagram showing that the patterns printed by the two nozzles are misaligned left and right;

[0034] Figure 6a , Figure 6b and Figure 6cSchematic diagrams respectively showing the third plane, the second plane and the first plane defined in the coding device and the combined nozzle thereof corresponding to the same reference object provided in the embodiment of the present invention;

[0035] Figure 7a and Figure 7b A schematic diagram showing the principle of a coding device and a combined nozzle thereof provided in an embodiment of the present invention;

[0036] Figure 8 A schematic diagram showing the structure of one nozzle in the combined nozzle of the coding device provided in an embodiment of the present invention;

[0037] Fig. 9 A schematic diagram showing the structure of a deflection electrode of a nozzle in a combined nozzle of a coding device according to an embodiment of the present invention;

[0038] Fig.10 A schematic diagram showing a partial cross-sectional structure of a nozzle in a combined nozzle of a coding device according to an embodiment of the present invention;

[0039] Fig.11 A partial cross-sectional structural schematic diagram of a combined nozzle of a coding device provided in an embodiment of the present invention is shown;

[0040] Fig.12a and Figure 12b Schematic diagrams showing that the spacing between the parts of the patterns printed by two nozzles is too large or overlaps;

[0041] Fig.13a A schematic diagram showing a projection of the combined nozzle of the coding device provided by an embodiment of the present invention on a second plane;

[0042] Fig.13b A schematic diagram showing the projection of the virtual emission point and the projection boundary of the combined nozzle of the coding device proposed in the embodiment of the present invention on the second plane;

[0043] Fig.14 A schematic diagram showing the structure of a coding device provided in an embodiment of the present invention is shown;

[0044] Fig.15a and Fig.15b A schematic diagram of an embodiment of the present invention is shown to illustrate the working principle;

[0045] Fig.16a A schematic diagram showing an implementation of a virtual ejection point and a projection boundary of a coding device in different situations provided in an embodiment of the present invention;

[0046] Fig.16b Another schematic diagram showing the implementation of the virtual ejection point and projection boundary of the inkjet printer in different situations according to the embodiment of the present invention;

[0047] Fig.17a and Fig.17b A schematic diagram showing the structure of a combined nozzle of a coding device in a preferred embodiment of the present invention;

[0048] Fig.18a , Fig.18b and Fig.18c A schematic diagram showing a preferred structure of a combined nozzle of a coding device according to an embodiment of the present invention;

[0049] Fig.19 A schematic diagram showing the electric field generated by the deflection electrode of a conventional inkjet device;

[0050] Fig.20a and Fig.20b Schematic diagrams showing the printing effect at different moving speeds of the substrate;

[0051] Fig.21 A schematic structural diagram showing a coding device according to an embodiment of the present invention, in which the A-polarity deflection electrode of the deflection electrode includes two A-polarity electrodes and the B-polarity deflection electrode includes one B-polarity electrode, and two A-polarity electrodes are arranged along the moving direction of the substrate;

[0052] Fig.22a A schematic diagram showing that, in the case where the deflection electrode of the inkjet device provided in an embodiment of the present invention includes two A-polarity electrodes and the B-polarity deflection electrode includes one B-polarity electrode, a first deflection electric field is generated when a voltage is applied to the first A-polarity electrode;

[0053] Figure 22b A schematic diagram showing that, in the case where the deflection electrode of the inkjet device provided by the embodiment of the present invention includes two A-polarity electrodes and the B-polarity deflection electrode includes one B-polarity electrode, a second deflection electric field is generated when a voltage is applied to the second A-polarity electrode;

[0054] Fig.23 A schematic diagram showing the direction of the deflection electric field of the deflection electrode of the inkjet device proposed in an embodiment of the present invention when the A-polarity deflection electrode includes two A-polarity electrodes and the B-polarity deflection electrode includes one B-polarity electrode, and when the intensities of the first deflection electric field and the second deflection electric field are equal;

[0055] Fig.24 A schematic diagram showing the direction of the deflection electric field of the deflection electrode of the inkjet device proposed in an embodiment of the present invention when the A-polarity deflection electrode includes two A-polarity electrodes and the B-polarity deflection electrode includes one B-polarity electrode, and the intensity of the first deflection electric field is stronger than the intensity of the second deflection electric field;

[0056] Fig.25A schematic diagram showing the direction of the deflection electric field of the deflection electrode of the inkjet device proposed in an embodiment of the present invention when the A-polarity deflection electrode includes two A-polarity electrodes and the B-polarity deflection electrode includes one B-polarity electrode, and the intensity of the second deflection electric field is stronger than the intensity of the first deflection electric field;

[0057] Fig.26a , Figure 26b , Fig.26c and Fig.26d Schematic diagrams of the electric fields of the deflection electrodes of the inkjet device for real-time automatic control of the deflection angle proposed in the embodiments of the present invention are respectively shown when the A polarity deflection electrode includes two A polarity electrodes and the B polarity deflection electrode includes two B polarity electrodes. DETAILED DESCRIPTION

[0058] To make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. However, those skilled in the art will appreciate that the present invention is not limited to the accompanying drawings and the following embodiments.

[0059] As described herein, the term "including" and its various variations may be understood as open terms, which mean "including but not limited to". The term "one embodiment" and similar expressions may be understood as "at least one embodiment". The term "another embodiment" and similar expressions may be understood as "at least one other embodiment". The term "based on" and similar expressions may be understood as "at least based on". The terms "first", "second", "third", etc. are only used to distinguish different features and have no substantive meaning. The terms "left", "right", "front", "back" and similar expressions are only used to indicate the positional relationship between relative objects.

[0060] Example 1

[0061] As mentioned above, in the case of collaborative printing of the same pattern (e.g. Figure 3 The pattern shown, Figure 3 In the case where the paper surface corresponds to the printing surface of the substrate and the moving direction of the substrate is the left and right direction of the paper surface, the upper and lower parts of the pattern (for example Figure 4a and Figure 4b "E1" and "E2" shown respectively, the paper surface corresponds to the printing surface of the substrate, and the movement direction of the substrate is the left and right direction of the paper surface) may be misaligned (for example Figure 5As shown, the paper surface corresponds to the printing surface of the substrate, and the moving direction of the substrate is the left-right direction of the paper surface). Based on this, the present invention proposes a coding device and a combined nozzle thereof, the combined nozzle comprising a first nozzle and a second nozzle that can work simultaneously, the deflection electric field of the first nozzle is opposite to the direction of the deflection electric field of the second nozzle, and when the target pattern is collaboratively printed, the intersection of the projection lines of the flight trajectories of the charged ink droplets of the first nozzle and the second nozzle used to print the target pattern on the third plane C is located on the projection line of the printing surface of the substrate 17 on the third plane C, so that each printing column constituting the target pattern can be completed simultaneously, wherein the third plane C is perpendicular to the first plane A and to the second plane B; the first plane A is parallel to the printing surface, and the second plane B is perpendicular to the moving direction of the substrate, as shown in FIG. Figure 6a , Figure 6b , Figure 6c , Figure 7a and Figure 7b As shown, the third plane C shown in the figure is the paper surface, Figure 7a The line segment from the nozzles 11a, 11b to the recovery tanks 16a, 16b is the projection of the flight trajectory of the uncharged ink droplets on the third plane C. Figure 7b The line segment from the nozzles 11a, 11b to the recovery grooves 16a, 16b is the projection of the flight trajectory of the charged ink droplets used to print the target pattern on the third plane C. Figure 7b The direction indicated by the middle arrow is the moving direction of the substrate. In the embodiment of the present invention, during the coordinated printing, the intersection of the projection lines of the flight trajectories of the charged ink droplets used by the first and second nozzles to print the target pattern on the third plane C is located on the projection line of the printing surface of the substrate 17 on the third plane C. Therefore, no matter how the moving speed of the substrate changes, each printing column constituting the target pattern is completed simultaneously, so the upper and lower parts of the target pattern can always be aligned left and right.

[0062] refer to Figure 7a As shown, the first nozzle includes a first nozzle 11a and a first recovery groove 16a. If the ink droplets ejected from the first nozzle 11a are not charged by the first charging part (not shown) of the first nozzle, they fall into the first recovery groove 16a for recovery; the second nozzle includes a second nozzle 11b and a second recovery groove 16b. If the ink droplets ejected from the second nozzle 11b are not charged by the second charging part (not shown) of the second nozzle, they fall into the second recovery groove 16b for recovery. The projections of the first nozzle 11a and the second nozzle 11b on the third plane C (the paper surface corresponds to the third plane C in the figure) form a certain angle with each other. When collaboratively printing, the intersection of the projection lines of the flight trajectories of the charged ink droplets used by the first nozzle and the second nozzle for printing the target pattern on the third plane C is located on the projection line of the printing surface of the substrate 17 on the third plane C. Please refer to Figure 7bThe first charging unit and the second charging unit may be a charging slot or the like.

[0063] In one embodiment, the first nozzle and the second nozzle are arranged front and back along the moving direction of the substrate; the first nozzle includes a first A polarity deflection electrode and a first B polarity deflection electrode; the second nozzle includes a second A polarity deflection electrode and a second B polarity deflection electrode; the A polarity and the B polarity are opposite polarities, that is, when the A polarity is positive, the B polarity is negative, and when the A polarity is negative, the B polarity is positive; the first B polarity deflection electrode and the second B polarity deflection electrode are arranged front and back along the moving direction of the substrate, the first A polarity deflection electrode and the second A polarity deflection electrode are respectively located on both sides separated by the first B polarity deflection electrode and the second B polarity deflection electrode, and the first B polarity deflection electrode is at least arranged corresponding to the first A polarity deflection electrode, and the second B polarity deflection electrode is at least arranged corresponding to the second A polarity deflection electrode.

[0064] In one embodiment, the first nozzle and the second nozzle have the same structure and size, and the first nozzle and the second nozzle are arranged in a front-to-back arrangement along the moving direction of the substrate in a 180° opposite direction. Fig.11 As shown, there is zero resistance contact between the first B polarity deflection electrode and the second B polarity deflection electrode.

[0065] Further, as mentioned above, the first nozzle includes a first recovery groove 16a, and the second nozzle includes a second recovery groove 16b. In one embodiment, the first B polarity deflection electrode is formed with a notch along the ink line direction of the first nozzle, and the first recovery groove is arranged corresponding to the notch of the first B polarity deflection electrode; the second B polarity deflection electrode is formed with a notch along the ink line direction of the second nozzle, and the second recovery groove is arranged corresponding to the notch of the second B polarity deflection electrode. In an optional embodiment, the notch of the first B polarity deflection electrode is a long strip-shaped notch with a narrow upper and wide lower shape, so that the first B polarity deflection electrode has an inclined surface opposite to the first A polarity deflection electrode at the notch; and the notch of the second B polarity deflection electrode has a narrow upper and wide lower shape, so that the second B polarity deflection electrode has an inclined surface opposite to the second A polarity deflection electrode at the notch, which can be referred to. Figures 8 to 11 The ink line represents the flight trajectory of the uncharged ink droplets, that is, the flight trajectory of the uncharged ink droplets not used for printing patterns. Figures 8 to 10 Examples of the first nozzle among the first nozzle and the second nozzle are given, and the second nozzle can refer to these examples. Figure 8 In the figure, the paper surface corresponds to the second plane B, which shows the arrangement of the ink line of the first nozzle and the first B polarity deflection electrode. Figure 8 The first B polarity deflection electrode is negative polarity, and the first A polarity deflection electrode is positive polarity. It can be understood that the first B polarity deflection electrode can also be positive polarity, and correspondingly, the first A polarity deflection electrode is negative polarity. Fig. 9 The schematic diagram of the three-dimensional structure of the first B polarity deflection electrode of the first nozzle is given, which can be regarded as Figure 8 Observing upward from the lower right side, a long notch is formed along the direction of the ink line. Fig.10 A schematic diagram of the main structure of the first nozzle along a cross section parallel to the first plane is given. In the figure, the paper surface corresponds to the first plane A. As shown in the figure, the first nozzle includes a first A polarity deflection electrode 25a, a first B polarity deflection electrode 24 and a first recovery groove 26. The first B polarity deflection electrode is formed with a long strip-shaped recess along the ink line direction of the first nozzle. The position of the first recovery groove 26 corresponds to the recess of the first B polarity deflection electrode 24. Fig.11 A schematic diagram of the main structure of the cross section parallel to the first plane when the first nozzle and the second nozzle are assembled together is given. Fig.11 The paper surface corresponds to the first plane A, wherein the first nozzle includes a first A polarity deflection electrode 25a, a first B polarity deflection electrode 24 and a first recovery groove, the first B polarity deflection electrode 24 forms a long strip notch along the ink line direction of the first nozzle, and the position of the first recovery groove corresponds to the notch of the first B polarity deflection electrode 24; the second nozzle includes a second A polarity deflection electrode 35a, a second B polarity deflection electrode 34 and a second recovery groove, the second B polarity deflection electrode 34 forms a long strip notch along the ink line direction of the second nozzle, and the position of the second recovery groove corresponds to the notch of the second B polarity deflection electrode 24. Fig.11 The combined nozzle structure shown is printed Figure 3 When the pattern shown is shown, the first nozzle prints the "E1" part, and the second nozzle prints the "E2" part. Fig.11 In the structure shown, along the moving direction of the substrate, the first nozzle is located in front of the second nozzle. The first nozzle and the second nozzle can also adopt other structures. Fig.11 The schematic diagram shown should not be understood as limiting the present embodiment.

[0066] An embodiment of the present invention also proposes a coding device, including a combined nozzle and a control unit, wherein the control unit divides the pattern to be printed on the printing surface of a substrate along the moving direction of the substrate to obtain sub-patterns to be printed, and allocates corresponding sub-patterns to be printed to the first nozzle and the second nozzle; the first nozzle and the second nozzle print the allocated sub-patterns under the control of the control unit.

[0067] The coding device and its combined nozzle proposed in this embodiment have the intersection of the projection lines of the flight trajectories of the charged ink droplets of the first nozzle and the second nozzle used to print the target pattern on the third plane located on the projection line of the printing surface of the substrate on the third plane during collaborative printing, so that the nozzles of the first nozzle and the second nozzle can print simultaneously when collaboratively printing each column of the target pattern. Therefore, no matter how the moving speed of the substrate changes, each printing column constituting the target pattern is completed simultaneously, so the upper and lower parts of the target pattern are always aligned left and right.

[0068] Example 2

[0069] Based on Example 1, this embodiment can further solve the technical problem of poor bonding effect of multiple separately printed parts of the same pattern.

[0070] Since the target pattern is formed by two parts of the target pattern printed by two nozzles respectively and then spliced ​​together, the positioning of the "E1" part and the "E2" part printed by the two nozzles must be accurate on the substrate to ensure that the lower part of the "E1" part and the upper part of the "E2" part are tightly joined. Otherwise, the following may occur: Fig.12a If the spacing shown is too large, or if Figure 12b The overlap shown in the figure makes the joint effect of multiple separately printed parts of the same pattern poor. Fig.12a and Figure 12b The paper surface corresponds to the printing surface of the substrate.

[0071] In order to solve the technical problem of poor bonding effect, in this embodiment, the adjacent projection boundaries of the flight trajectories of the charged ink droplets of the first nozzle and the second nozzle on the second plane are collinear, and the areas within the projection boundaries do not overlap with each other; or the adjacent projection boundaries of the flight trajectories of the charged ink droplets of the first nozzle and the second nozzle on the second plane are equidistantly spaced, and the areas within the projection boundaries do not overlap with each other. The projection boundary of the flight trajectory of the charged ink droplets on the second plane is the straight line portion of the flight trajectory of the charged ink droplet with the smallest deflection amplitude under the deflection electric field or the straight line portion of the flight trajectory of the charged ink droplet with the largest deflection amplitude under the deflection electric field. Fig.13a The schematic diagram of the projection of the nozzles, ink lines and recovery grooves of the first and second nozzles on the second plane is shown. Fig.13a The paper surface corresponds to the second plane B, the nozzles of the first nozzle and the second nozzle form a certain angle with each other, the ink line is the flight trajectory of the uncharged ink droplets, and the uncharged ink droplets are recovered by the recovery tank. In order to solve the technical problem that when the distance between the printing surface and the nozzle changes, the joint effect of multiple parts of the same pattern that are printed separately is not good, resulting in excessive spacing or overlap, the projection boundaries of the flight trajectories of the charged ink droplets of the first nozzle and the second nozzle on the second plane are collinear or equidistantly spaced, Fig.13b The figure shows the situation where the projection boundaries of the flight trajectories of the charged ink droplets of the first nozzle and the second nozzle on the second plane are collinear. Fig.13b The paper surface corresponds to the second plane B.

[0072] The following is a detailed description of Example 2 with reference to the accompanying drawings. When the charged ink droplets (ink droplets used for printing) fly through the deflection electric field range, they will make a parabolic motion and deviate from the recovery part (such as a recovery tank, a recovery pipe), and after leaving the deflection electric field, the charged ink droplets will fly in a straight line and finally fall on the printing surface of the substrate. Fig.14 As shown, Fig.14 The paper surface corresponds to the second plane B.

[0073] From the second plane, the projection range of the flight trajectory of the charged ink droplet is as follows: Fig.14 As shown, path La indicates the flight trajectory of a charged ink droplet with the smallest deflection amplitude, path Lb indicates the flight trajectory of a charged ink droplet with the largest deflection amplitude, and path Lo indicates the flight trajectory of an uncharged ink droplet.

[0074] To facilitate the analysis of the principle, the straight line parts of path La and path Lb under the deflection electric field are extended in the opposite direction and intersect at point J, as shown in Fig.15a As shown, this intersection point is called the virtual ejection point. Fig.15a The paper surface corresponds to the second plane B. From the outside of the nozzle, the flight trajectory of the charged ink droplets flying along the path La and the path Lb can be simplified to being ejected from point J and flying along a straight line.

[0075] Back to the example above Figure 3 In the example of two nozzles for collaborative printing shown in FIG. 1 , when printing the “E1” part and the “E2” part respectively, the projection of the flight trajectory range of the charged ink droplets on the second plane is as follows: Fig.15b As shown, Fig.15b The paper surface corresponds to the second plane B. The ink droplets of the bottom row of the printing "E1" part fly along the path Lb1, and the ink droplets of the top row of the printing "E2" part fly along the path La2. Fig.15b It can be seen that the paths Lb1 and La2 form a certain angle with each other and have an intersection. Therefore, when the distance between the printing surface and the nozzle changes, that is, when the printing surface is below or above the intersection of the paths Lb1 and La2, the lower part of the "E1" part and the upper part of the "E2" part will appear as shown below. Fig.12a The spacing is too large as shown or Figure 12b The overlap phenomenon shown in the figure is that only when the printing surface is at the intersection of path Lb1 and path La2, the lower part of "E1" and the upper part of "E2" can be tightly joined to print out the following: Figure 3 The pattern shown.

[0076] In actual use, due to the influence of factors such as equipment vibration and error in substrate size, the distance between the printing surface and the nozzle is constantly changing within a certain range, so the bonding effect of the "E1" part and the "E2" part is sometimes good and sometimes bad.

[0077] In order to solve the technical problem of poor joining effect between multiple separately printed parts of the same pattern, a coding device and a combined nozzle are proposed in an embodiment of the present invention. By setting the position of the virtual injection point of each nozzle and the flight trajectory of the charged ink droplets of the extreme value of the deflection amplitude of the nozzle, the technical problem of poor joining effect between multiple separately printed parts of the same pattern can be solved.

[0078] For reference Fig.14 As shown, Fig.14 The paper surface corresponds to the second plane, and the coding device proposed in this embodiment includes: a combined nozzle and a control unit, the combined nozzle includes a first nozzle and a second nozzle arranged front and back along the moving direction of the substrate; the control unit divides the pattern to be printed on the printing surface of the substrate along the moving direction of the substrate to obtain the sub-pattern to be printed; the control unit allocates the corresponding sub-patterns to be printed to the first nozzle and the second nozzle; the first nozzle and the second nozzle print the allocated sub-patterns under the control of the control unit, wherein the projection boundaries of the flight trajectories of the charged ink droplets of the first nozzle and the second nozzle on the second plane are collinear, and the areas within the projection boundaries do not overlap with each other; or the projection boundaries of the flight trajectories of the charged ink droplets of the first nozzle and the second nozzle on the second plane are equidistantly spaced, and the areas of the projection boundaries do not overlap with each other; the projection boundary of the flight trajectory of the charged ink droplets on the second plane is the straight line portion of the flight trajectory of the charged ink droplet with the smallest deflection amplitude under the deflection electric field or the straight line portion of the flight trajectory of the charged ink droplet with the largest deflection amplitude under the deflection electric field.

[0079] In one embodiment, the projections of the virtual ejection points of the first nozzle and the second nozzle on the second plane coincide with each other, which can be referred to as Fig.16a and Fig.16b As shown, Fig.16a and Fig.16b The paper surface corresponds to the second plane B, the path La1 of the first nozzle and the path La2 of the second nozzle are collinear, and the projections of the areas within the paths La1 and Lb1 and the areas within the paths La2 and Lb2 on the second plane do not overlap with each other, and the projections of the virtual exit point J1 of the first nozzle and the virtual exit point J2 of the second nozzle on the second plane overlap. In another embodiment, the projections of the virtual exit points of the first nozzle and the second nozzle on the second plane may not overlap, and the projections of the virtual exit points of the first nozzle and the second nozzle on the second plane are both located on the collinear projection boundary, which can be referred to Fig.17a and Fig.17bAs shown, the path La1 of the first nozzle and the path La2 of the second nozzle are collinear, and the projections of the areas within the paths La1 and Lb1 and the areas within the paths La2 and Lb2 on the second plane do not overlap with each other, the projections of the virtual ejection point J1 of the first nozzle and the virtual ejection point J2 of the second nozzle on the second plane do not overlap, and the projections of the virtual ejection point J1 of the first nozzle and the virtual ejection point J2 of the second nozzle on the second plane are both located on the collinear projection boundary; or the projections of the virtual ejection points of the two nozzles printing adjacent sub-patterns on the second plane are spaced in a manner consistent with the equidistant spacing (not shown). Among them, the intersection point where the flight trajectory of the charged ink droplet with the smallest deflection amplitude of one nozzle and the flight trajectory of the charged ink droplet with the largest deflection amplitude intersect after the straight line portion under the deflection electric field is extended in the reverse direction is called the virtual ejection point. In addition, when the projections of the virtual exit points of the first nozzle and the second nozzle on the second plane do not overlap, and the projections of the virtual exit points of the first nozzle and the second nozzle on the second plane are both located on the collinear projection boundary, the projections of the virtual exit points of the first nozzle and the second nozzle on the second plane may be on a line parallel to the moving surface of the substrate or not on a line parallel to the moving surface of the substrate, wherein the projections of the virtual exit points of the first nozzle and the second nozzle on the second plane may be on a line parallel to the moving surface of the substrate, which is used to indicate that the projections of the virtual exit points of the first nozzle and the second nozzle on the second plane are at the same height relative to the moving surface of the substrate.

[0080] Fig.16a and Fig.16b The projection diagram of the virtual ejection point on the second plane and the projection diagram of the projection boundary of the flight trajectory of the charged ink droplet on the second plane when the first and second nozzles cooperate in printing are respectively given. Fig.16a and Fig.16b In the figure, the lower part of the sub-pattern printed by the first nozzle corresponds to the charged ink droplets with a small deflection amplitude, and the upper part of the sub-pattern printed by the first nozzle corresponds to the charged ink droplets with a large deflection amplitude; the lower part of the sub-pattern printed by the second nozzle corresponds to the charged ink droplets with a small deflection amplitude, and the upper part of the sub-pattern printed by the second nozzle corresponds to the charged ink droplets with a large deflection amplitude. Fig.16a and Fig.16b In the case shown, the flight trajectories of the charged ink droplets with the smallest deflection amplitudes of the first nozzle and the second nozzle are collinear on the second plane. Of course, the flight trajectories of the charged ink droplets with the smallest deflection amplitudes of the first nozzle and the second nozzle can also be equidistantly spaced on the second plane (not shown). Fig.16aA preferred embodiment is also shown in which the projections of the virtual ejection points of the two nozzles on the second plane overlap. A person skilled in the art can understand that the projections of the virtual ejection points of the first nozzle and the second nozzle on the second plane may not overlap, as long as the projections of the virtual ejection points of the first nozzle and the second nozzle on the second plane are on the collinear projection boundary. Fig.16b Similarly, when the flight trajectories of the charged ink droplets with the smallest deflection amplitude of the first nozzle and the second nozzle are equidistant on the second plane, the projections of the virtual ejection points of the first nozzle and the second nozzle on the second plane may be on a line parallel to the printing surface of the carrier or not on a line parallel to the printing surface of the carrier (it can be understood that the vertical heights of the virtual ejection points of the first nozzle and the second nozzle relative to the printing surface are equal or unequal). In addition, those skilled in the art can understand that the lower part of the sub-pattern printed by the first nozzle corresponds to charged ink droplets with a small deflection amplitude, and the upper part of the sub-pattern printed by the first nozzle corresponds to charged ink droplets with a large deflection amplitude; the upper part of the sub-pattern printed by the second nozzle corresponds to charged ink droplets with a large deflection amplitude, and the lower part of the sub-pattern printed by the second nozzle corresponds to charged ink droplets with a small deflection amplitude; or, the lower part of the sub-pattern printed by the first nozzle corresponds to charged ink droplets with a large deflection amplitude, and the upper part of the sub-pattern printed by the first nozzle corresponds to charged ink droplets with a small deflection amplitude; the upper part of the sub-pattern printed by the second nozzle corresponds to charged ink droplets with a large deflection amplitude, and the lower part of the sub-pattern printed by the second nozzle corresponds to charged ink droplets with a small deflection amplitude.

[0081] In one embodiment, the equidistant spacing of the projected boundaries of the flight trajectories of the charged ink droplets of the first and second nozzles printing adjacent sub-patterns on the second plane is applicable to the case where there is a blank area between adjacent sub-patterns printed, for example Figure 3 The pattern shown is a combination of "E1" and "E2" in the longitudinal direction. The projection of the equal distance on the printing surface is not greater than the blank spacing between adjacent sub-patterns printed.

[0082] The projection boundaries of the flight trajectories of the charged ink droplets corresponding to the first nozzle and the second nozzle on the second plane may be fixed or adjusted before printing.

[0083] Furthermore, the inkjet coding device proposed in the embodiment of the present invention makes the projected boundaries of the flight trajectories of the charged ink droplets of the two nozzles printing adjacent sub-patterns on the second plane be collinear or equidistant, while the areas within the projected boundaries do not overlap with each other, so that when the two nozzles printing adjacent sub-patterns print the endmost printing points at the joining positions of the adjacent sub-patterns, the flight trajectories of the charged ink droplets sprayed by the two nozzles printing the adjacent sub-patterns are parallel to each other in the straight line portion under the deflection electric field, even if the distance between the printing surface and the nozzle changes within a certain range due to factors such as the vibration of the equipment and the error in the size of the printing material, the printed patterns of each nozzle will not overlap or have excessive spacing, so that the multiple parts of the same pattern printed separately are tightly joined with good joining effect.

[0084] In one embodiment, when the coding device proposed by the present invention is implemented, in order to facilitate installation and adjustment, the outer dimensions and performance parameters of the first nozzle and the second nozzle are designed to be the same, and the projections of the virtual injection points on the second plane coincide with each other, that is, the positions of the projections of the virtual injection points on the second plane are the same, and the axes of the nozzles form an appropriate angle, which can be referred to Fig.17a and Fig.17b As shown, the projected boundaries of the flight trajectories of the charged ink droplets of the first nozzle and the second nozzle that print adjacent sub-patterns on the second plane can be precisely collinear or equidistantly spaced, Fig.17a and Fig.17b The paper surface corresponds to the second plane B.

[0085] In one embodiment, the first nozzle and the second nozzle may be of different or same models. Preferably, the first nozzle and the second nozzle are of the same model. When installing, the first nozzle (such as Fig.17a Install in the opposite direction of 180 degrees (as shown) Fig.17b As shown), it can be used as the second nozzle.

[0086] Example 3

[0087] Based on Embodiment 1 and Embodiment 2, this embodiment can further solve the technical problem that the printed pattern is obviously deformed when the moving speed of the substrate changes greatly or moves in the opposite direction.

[0088] refer to Fig.18a , Fig.18b and Fig.18c As shown, Fig.18a The paper surface corresponds to the second plane B, Fig.18b and Fig.18cThe paper surface corresponds to the first plane A, the first nozzle also includes a third A polarity deflection electrode 25b which is arranged corresponding to the first B polarity deflection electrode 24 and on the same side as the second A polarity deflection electrode 35a, and the second nozzle also includes a fourth A polarity deflection electrode 35b which is arranged corresponding to the second B polarity deflection electrode 34 and on the same side as the first A polarity deflection electrode 25a; the fourth A polarity deflection electrode and the first A polarity deflection electrode are arranged front and back along the moving direction of the substrate; the first A polarity deflection electrode 25a and the fourth A polarity deflection electrode 35b are adjacent to each other and electrically insulated from each other, and the second A polarity deflection electrode 35a and the third A polarity deflection electrode 25b are adjacent to each other and electrically insulated from each other. In an optional embodiment, the notch of the first B polarity deflection electrode is opposite to the notch of the second B polarity deflection electrode, and the first B polarity deflection electrode 24 and the second B polarity deflection electrode 34 are in zero resistance contact with each other. The first A-polarity deflection electrode and the fourth A-polarity deflection electrode are arranged in a manner that can control the direction of the deflection electric field of the first nozzle, and the second A-polarity deflection electrode and the third A-polarity deflection electrode are arranged in a manner that can control the direction of the deflection electric field of the second nozzle. In an optional embodiment, when the first A-polarity deflection electrode and the fourth A-polarity deflection electrode are arranged in a manner that can control the direction of the deflection electric field of the first nozzle, and the second A-polarity deflection electrode and the third A-polarity deflection electrode are arranged in a manner that can control the direction of the deflection electric field of the second nozzle, during collaborative printing, the intersection of the projection lines of the flight trajectories of the charged ink droplets used by the first nozzle and the second nozzle to print the target pattern on the third plane is located on the projection line of the printing surface of the substrate on the third plane.

[0089] In this embodiment, for the first nozzle, the first B polarity deflection electrode 24 and the second B polarity deflection electrode 34 constitute the B polarity deflection electrode of the first nozzle, and the first A polarity deflection electrode 25a and the fourth A polarity deflection electrode 35b are arranged in a manner that can control the direction of the deflection electric field, constituting the A polarity deflection electrode of the first nozzle; for the second nozzle, the first B polarity deflection electrode 24 and the second B polarity deflection electrode 34 constitute the B polarity deflection electrode of the second nozzle, and the second A polarity deflection electrode 35a and the third A polarity deflection electrode 25b are arranged in a manner that can control the direction of the deflection electric field, constituting the A polarity deflection electrode of the second nozzle. By controlling the direction of the deflection electric field, the technical problem of pattern deformation in cooperative printing can be effectively solved.

[0090] The following is a detailed description with reference to the accompanying drawings.

[0091] Fig.19 A schematic diagram showing the electric field generated by the deflection electrode of a conventional inkjet device is shown. Fig.19 The paper surface corresponds to the first plane B. Combined with the reference Figure 1 and Figure 2 During the inkjet printing process, the substrate can move in one direction from left to right or from right to left, or it can move back and forth from left to right. Figure 1 In the example, the substrate moves to the right. Since the substrate moves to the right, in the same column of ink droplets, the ink droplets printed later will fall on the left side of the ink droplets printed earlier. In this way, the pattern obtained by printing is different from the expected printing effect (such as Figure 3 As shown in the figure, a certain degree of deformation will occur, such as Fig.20a As shown, Fig.20a The paper surface corresponds to the printing surface of the substrate, and the faster the substrate moves, the more serious the deformation. Similarly, when the substrate moves to the left, since the substrate has a leftward movement speed, in the same column of ink droplets, the ink droplets printed later will fall on the right side of the ink droplets printed earlier, and the pattern obtained by printing will also be deformed to a certain extent relative to the expected printing effect. In the case of printing with reciprocating motion of the substrate, in order to reduce the degree of deformation of the printing effect, the reciprocating (i.e. right / left) movement speed of the substrate can only be reduced as much as possible, for example, the reciprocating movement speed of the substrate can be reduced to the point where the deformation of the pattern obtained by printing is small enough to be acceptable. However, reducing the speed of the substrate movement will seriously limit production efficiency. In order to prevent the deformation of the printed pattern caused by the moving speed of the substrate, the applicant found that the negative polarity deflection electrode and the positive polarity deflection electrode can be mechanically moved according to the rated speed of the substrate, so that the direction of the deflection electric field formed by the negative polarity deflection electrode and the positive polarity deflection electrode changes, thereby presetting the angle between the deflection electric field direction and the moving direction of the substrate to a specific angle, which can reduce the deformation of the pattern obtained by printing. The applicant further found in the experiment that when there is a large deviation between the moving speed of the substrate and the rated speed, the deformation of the printed pattern will still be very obvious. Specifically, when the moving speed of the substrate is less than the rated speed and there is a large deviation, in the same column of ink droplets, the ink droplets printed later will fall on the side of the ink droplets printed earlier that is the same as the moving direction of the substrate, resulting in obvious deformation of the printed pattern; when the moving speed of the substrate is greater than the rated speed and there is a large deviation, in the same column of ink droplets, the ink droplets printed later will fall on the side of the ink droplets printed earlier that is opposite to the moving direction of the substrate, resulting in obvious deformation of the printed pattern. Fig.20a and Fig.20b An example of the above situation is given. For example, when the substrate moves to the right, if the substrate's moving speed does not deviate significantly from the rated speed, the printed pattern will not be deformed, or the printed pattern will not be deformed significantly. Fig.20b As shown, Fig.20bThe paper surface corresponds to the printing surface of the substrate; when the moving speed of the substrate is less than the rated speed and there is a large deviation, in the same column of ink droplets, the ink droplets printed later will fall on the right side of the ink droplets printed earlier, resulting in obvious deformation of the printed pattern, such as Fig.20a As shown. It can be seen that the negative polarity deflection electrode and the positive polarity deflection electrode are mechanically adjusted according to the rated speed of the substrate so that the direction of the deflection electric field formed by the negative polarity deflection electrode and the positive polarity deflection electrode changes. When there is no large deviation between the moving speed of the substrate and the rated speed, the printed pattern will not be deformed or the deformation is not obvious. However, when there is a large deviation between the moving speed of the substrate and the rated speed, the printed pattern will be obviously deformed. In order to solve the above technical problems, the applicant analyzed the deflection electrode of the inkjet device and found that the deflection electrode of the conventional inkjet device consists of a positive electrode and a negative electrode. The direction of the electric field formed by such a deflection electrode cannot be controlled by changing the voltage on the electrode.

[0092] In order to solve the technical problem that the printing pattern will be obviously deformed when the moving speed of the substrate changes greatly or the moving direction is opposite, the coding device and the combined nozzle proposed in the embodiment of the present invention further solve the technical problem that the printing pattern will be obviously deformed when the moving speed of the substrate changes greatly or the moving direction is opposite by automatically controlling the electric field direction of the deflection electrode in real time without mechanically manipulating the deflection electrode. Fig.18c shown.

[0093] To further explain how to solve the technical problem of obvious deformation of the printed pattern, please refer to Fig.21 , Fig.22a and Figure 22b As shown, each of the first and second nozzles includes: an A polarity deflection electrode 14 and a B polarity deflection electrode 15, and the A polarity and the B polarity are opposite to each other. It can be understood that when the A polarity is positive, the B polarity is negative; when the A polarity is negative, the B polarity is positive. Fig.22a , Figure 22b , Figure 23 to Figure 25 , Figures 26a to 26d According to Fig.21 A schematic diagram looking down from above. Fig.22a , Figure 22b , Figure 23 to Figure 25 , Figures 26a to 26d The paper surface corresponds to the first plane A.

[0094] The A polarity deflection electrode 14 is arranged opposite to the B polarity deflection electrode 15. In one embodiment, the A polarity deflection electrode 14 and the B polarity deflection electrode 15 are arranged parallel to each other. The surface of the A polarity deflection electrode 14 opposite to the B polarity deflection electrode 15 is the first surface, and the surface of the B polarity deflection electrode 15 opposite to the A polarity deflection electrode 14 is the second surface. When voltages of corresponding electric polarities are applied to the A polarity deflection electrode 14 and the B polarity deflection electrode 15, the area between the first surface of the A polarity deflection electrode 14 and the second surface of the B polarity deflection electrode 15 forms a deflection electric field of the deflection electrode of the inkjet device. Fig.21 An example is given in which the A-polarity deflection electrode 14 is a positive polarity deflection electrode and the B-polarity deflection electrode 15 is a negative polarity deflection electrode, and an example is given in which the A-polarity deflection electrode 14 and the B-polarity deflection electrode 15 are arranged parallel to each other. Fig.18c The structure of the first nozzle shown, Fig.21 The B polarity deflection electrode 15 and Fig.18c The first B polarity deflection electrode 24 and the second B polarity deflection electrode 34 correspond to each other, Fig.21 The A polarity deflection electrode 14 and Fig.18c The first A polarity deflection electrode 25a and the fourth A polarity deflection electrode 35b correspond to each other; Fig.18c The structure of the second nozzle shown, Fig.21 The B polarity deflection electrode 15 and Fig.18c The first B polarity deflection electrode 24 and the second B polarity deflection electrode 34 correspond to each other, Fig.21 The A polarity deflection electrode 14 and Fig.18c The second A polarity deflection electrode 35a corresponds to the third A polarity deflection electrode 25b.

[0095] The A-polarity deflection electrode includes two A-polarity electrodes that are electrically insulated from each other and are arranged in a manner such that the deflection direction of the deflection electric field is controllable. Fig.18c In the situation shown, one of the two A-polarity electrodes of the first nozzle that are electrically insulated from each other is the first A-polarity deflection electrode 25a, and the other is the fourth A-polarity deflection electrode 35b of the second nozzle; one of the two A-polarity electrodes of the second nozzle that are electrically insulated from each other is the second A-polarity deflection electrode 35a, and the other is the second A-polarity deflection electrode 25b of the first nozzle. The two A-polarity electrodes are arranged along the moving direction of the substrate when the inkjet device is working. Fig.21 In the schematic diagram shown, the substrate moves in the horizontal direction ( Fig.21 Further, an example of horizontal rightward movement is given. It can be understood that the direction of movement of the substrate can also be horizontal leftward movement or left-right reciprocating movement). Fig.21In the illustrated case, the two A-polarity electrodes are arranged in the horizontal direction. It can be understood that if the printing material moves in the vertical direction, then at least two of the two A-polarity electrodes are arranged front and back in the vertical direction. Fig.21 In the schematic diagram shown, the A polarity deflection electrode 14 includes two A polarity electrodes. The first A polarity electrode 141 and the second A polarity electrode 142 are electrically insulated from each other and are arranged front and back along the moving direction of the substrate and are parallel to the B polarity deflection electrode 15.

[0096] When voltages of corresponding electric polarities are applied to the two A-polarity electrodes and the B-polarity deflection electrode, the area between the first surface of each of the two A-polarity electrodes and the second surface of the B-polarity deflection electrode forms an electric field for each A-polarity electrode, and all the electric fields for each A-polarity electrode are superimposed to form a deflection electric field of the deflection electrode of the inkjet device. The deflection direction of the deflection electric field can be controlled by adjusting the voltage applied to the two A-polarity electrodes. Fig.21 In the schematic diagram shown, a first deflection electric field for the first polarity electrode 141 is formed between the first surface of the first A polarity electrode 141 and the second surface of the B polarity deflection electrode 15, and a second deflection electric field for the second polarity electrode 142 is formed between the first surface of the second polarity electrode 142 and the second surface of the B polarity deflection electrode 15. The first deflection electric field for the first polarity electrode 141 and the second deflection electric field for the second polarity electrode 142 are superimposed to form a deflection electric field of the deflection electrode of the inkjet device.

[0097] The voltage applied to the two A-polarity electrodes may be adjusted by adjusting the voltage applied to one of the two A-polarity electrodes, or by adjusting the voltage applied to the two A-polarity electrodes. Fig.21 In the schematic diagram shown, the voltage applied to the first A polarity electrode 141 or the second polarity electrode 142 can be adjusted to control the deflection direction of the deflection electric field, and the voltage applied to the first A polarity electrode 141 and the second polarity electrode 142 can also be adjusted to control the deflection direction of the deflection electric field.

[0098] In an optional embodiment, the first A polarity deflection electrode and the fourth A polarity deflection electrode are arranged in a manner to control the deflection electric field direction of the first nozzle, and the second A polarity deflection electrode and the third A polarity deflection electrode are arranged in a manner to control the deflection electric field direction of the second nozzle.

[0099] The deflection electrode of the inkjet device provided in the embodiment of the present invention can automatically control the deflection direction of the deflection electric field in real time by automatically adjusting the voltage applied to the two A-polarity electrodes in real time.

[0100] The working principle of the combined nozzle proposed in this embodiment is exemplarily described below. Fig.18c Taking the first nozzle as an example, assuming that the A polarity is positive and the B polarity is negative, the first B polarity deflection electrode 24 and the second B polarity deflection electrode 34 are in zero resistance contact, forming the B polarity deflection electrode of the first nozzle, and the negative voltage applied is "-V"; the first A polarity deflection electrode 25a and the fourth A polarity deflection electrode 35b are electrically insulated from each other, forming the A polarity deflection electrode of the first nozzle, the first positive voltage applied to the first A polarity deflection electrode 25a is "+V1", and the second positive voltage applied to the fourth A polarity deflection electrode 35b is "+V2", wherein a first deflection electric field T1 is formed between the first surface of the first A polarity deflection electrode 25a and the second surface of the B polarity deflection electrode of the first nozzle, as shown in FIG. Fig.22a As shown; a second deflection electric field T2 is formed between the first surface of the fourth A polarity deflection electrode 35b and the second surface of the B polarity deflection electrode of the first nozzle, as shown Figure 22b As shown. The first deflection electric field T1 and the second deflection electric field T2 are superimposed to form the deflection electric field T of the deflection electrode of the inkjet device. The direction of the deflection electric field T depends on the relative strength between the first deflection electric field T1 and the second deflection electric field T2. When the strength of the first deflection electric field T1 and the second deflection electric field T2 are equal, the direction of the deflection electric field T is parallel to the central axis direction of the electrode "-V", as shown in FIG. Fig.23 When the intensity of the first deflection electric field T1 is stronger than the intensity of the second deflection electric field T2, the direction of the deflection electric field T presents the same direction as the deflection of the first deflection electric field T1, as shown in FIG. Fig.24 When the intensity of the second deflection electric field T2 is stronger than the intensity of the first deflection electric field T1, the direction of the deflection electric field T presents the same direction as the deflection of the second deflection electric field T2, as shown in FIG. Fig.25 shown.

[0101] Moreover, the deflection direction of the deflection electric field T can be controlled by changing the voltage "+V1" applied to the first A polarity deflection electrode 25a and / or the voltage "+V2" applied to the fourth A polarity deflection electrode 35b. The greater the potential difference between the voltage "+V1" applied to the first A polarity deflection electrode 25a and the voltage "+V2" applied to the fourth A polarity deflection electrode 35b, the greater the deflection angle of the deflection electric field T; the smaller the potential difference between the voltage "+V1" applied to the first A polarity deflection electrode 25a and the voltage "+V2" applied to the fourth A polarity deflection electrode 35b, the smaller the deflection angle of the deflection electric field T. The deflection direction of the deflection electric field T can eliminate the deformation of the printed pattern caused by the change in the moving speed of the substrate. For example, when the moving speed of the substrate is less than the rated speed, such as Fig.20aAs shown, the embodiment of the present invention adjusts the deflection direction of the deflection electric field, for example, by using Fig.25 The deflection electric field shown in FIG. 1 compensates for the possible deformation of the printed pattern; similarly, when the moving speed of the substrate is greater than the rated speed, the embodiment of the present invention can adopt Fig.24 The deflection electric field shown compensates for possible deformation of the printed pattern.

[0102] In practical applications, it is only necessary to control one of the voltage values ​​of the voltage "+V1" applied to the first A-polarity deflection electrode 25a and the voltage "+V2" applied to the fourth A-polarity deflection electrode 35b to conveniently realize the control of the deflection direction of the deflection electric field T. It can be understood that, in an embodiment, when the A polarity is negative and the B polarity is positive, the above embodiment can also be referred to for implementation, and those skilled in the art can clearly understand its implementation method based on the description of the above embodiment.

[0103] The deflection electrode of the inkjet device proposed in the embodiment of the present invention changes the existing combination mode of the deflection electrode composed of two electrodes, one positive and one negative. The electrodes of the same polarity of each nozzle can be arranged in a controllable manner in the deflection direction of the deflection electric field, and then the deflection direction of the deflection electric field can be controlled by controlling the voltage applied to each electrode of the same polarity, without the need for any mechanical manipulation of the electrode, wherein only the direction of the electric field is deflected, not the electrode itself.

[0104] In this embodiment, the inkjet coding device may further include a speed sensor (not shown) and a processor (not shown), and the speed sensor is used to obtain the moving speed of the substrate 17 located below the nozzle in real time. The processor is connected to the speed sensor, and adjusts the voltage applied to the electrode based on the moving speed of the substrate 17 obtained in real time by the speed sensor. In one embodiment, the voltage applied to the electrode is adjusted based on the moving speed of the substrate 17 obtained in real time by the speed sensor, including: calculating the deflection angle that needs to be compensated for the deflection electric field T in real time based on the moving speed of the substrate 17 obtained in real time; calculating the potential difference value based on the deflection angle that needs to be compensated for the deflection electric field T calculated in real time; and adjusting the voltage applied to the electrode based on the calculated potential difference value. The electrode is an electrode used to control the deflection electric field, and may be Fig.18c The first A polarity deflection electrode 25a and / or the fourth A polarity deflection electrode 35b shown, the second A polarity deflection electrode 35a and / or the third A polarity deflection electrode 25b.

[0105] The moving speed of the printing substrate 17 here includes the moving rate of the printing substrate. In some applications, the moving speed of the printing substrate also includes the moving direction of the printing substrate.

[0106] In one embodiment, the speed sensor includes an axis encoder, through which real-time data of the moving speed of the printing material 17 can be obtained.

[0107] In view of the technical problem that the printing pattern will be significantly deformed when the speed of the substrate changes greatly, the embodiments of the present invention can compensate for the possible deformation of the printing pattern caused by the speed of the substrate by controlling the deflection direction of the deflection electric field, so that even when the speed of the substrate changes greatly, the printed pattern will not be significantly deformed. Fig.20a In the case shown, since the moving speed of the substrate is less than the rated speed and there is a large deviation, in the same column of ink droplets, the ink droplets printed later will fall on the right side of the ink droplets printed earlier, causing the printed pattern to be significantly deformed. In view of this situation, the deflection electrode proposed in the embodiment of the present invention can control the deflection direction of the deflection electric field to compensate for the possible deformation of the printed pattern, for example, by using Fig.25 The deflection direction of the deflection electric field shown in the figure compensates for the possible deformation of the printed pattern; similarly, when the moving speed of the substrate is greater than the rated speed and there is a large deviation, the ink droplets printed later in the same column of ink droplets will fall on the side of the ink droplets printed earlier that is opposite to the moving direction of the substrate, causing the printed pattern to be significantly deformed. In view of this situation, the deflection electrode proposed in the embodiment of the present invention can control the deflection direction of the deflection electric field to compensate for the possible deformation of the printed pattern. For example, it can be used Fig.24 The deflection direction of the deflection electric field shown compensates for possible deformation of the printed pattern.

[0108] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0109] The above is an explanation of the embodiments of the present invention. However, the present invention is not limited to the above embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A combined nozzle of a coding device, characterized in that: The combined nozzle comprises a first nozzle and a second nozzle that can work simultaneously, the deflection electric field of the first nozzle is opposite to the direction of the deflection electric field of the second nozzle, and when the target pattern is collaboratively printed, the intersection of the projection lines of the flight trajectories of the charged ink droplets of the first nozzle and the second nozzle used to print the target pattern on the third plane is located on the projection line of the printing surface of the substrate on the third plane, so that each printing column constituting the target pattern can be completed simultaneously, wherein the third plane is perpendicular to the first plane and the second plane; the first plane is parallel to the printing surface, and the second plane is perpendicular to the moving direction of the substrate; The first nozzle has the same structure and size as the second nozzle; The first nozzle and the second nozzle are arranged in a front-to-back arrangement along the moving direction of the substrate; The first nozzle includes a first A-polarity deflection electrode and a first B-polarity deflection electrode; The second nozzle includes a second A-polarity deflection electrode and a second B-polarity deflection electrode; The A polarity and the B polarity are opposite polarities to each other; The first B-polarity deflection electrode and the second B-polarity deflection electrode are arranged front and back along the moving direction of the substrate, the first A-polarity deflection electrode and the second A-polarity deflection electrode are respectively located on two sides separated by the first B-polarity deflection electrode and the second B-polarity deflection electrode, and the first B-polarity deflection electrode is at least arranged corresponding to the first A-polarity deflection electrode, and the second B-polarity deflection electrode is at least arranged corresponding to the second A-polarity deflection electrode; The first nozzle further includes a third A-polarity deflection electrode, which is arranged correspondingly to the first B-polarity deflection electrode and is located on the same side of the second A-polarity deflection electrode, and the third A-polarity deflection electrode and the second A-polarity deflection electrode are arranged front and back along the moving direction of the substrate; the second nozzle further includes a fourth A-polarity deflection electrode, which is arranged correspondingly to the second B-polarity deflection electrode and is located on the same side of the first A-polarity deflection electrode, and the fourth A-polarity deflection electrode and the first A-polarity deflection electrode are arranged front and back along the moving direction of the substrate; The first A-polarity deflection electrode and the fourth A-polarity deflection electrode are adjacent to and electrically insulated from each other, and the second A-polarity deflection electrode and the third A-polarity deflection electrode are adjacent to and electrically insulated from each other.

2. The combined nozzle according to claim 1, characterized in that: The first nozzle also includes a first recovery groove, and the second nozzle also includes a second recovery groove. The first B polarity deflection electrode has a notch formed along the ink line direction of the first nozzle, and the first recovery groove is set corresponding to the notch of the first B polarity deflection electrode; the second B polarity deflection electrode has a notch formed along the ink line direction of the second nozzle, and the second recovery groove corresponds to the notch of the second B polarity deflection electrode.

3. The combined nozzle according to claim 2, characterized in that: The notch of the first B polarity deflection electrode is a long strip-shaped notch whose projection on the second plane is narrow at the top and wide at the bottom, and the notch of the second B polarity deflection electrode is a long strip-shaped notch whose projection on the second plane is narrow at the top and wide at the bottom.

4. The combined nozzle according to claim 2 or 3, characterized in that: The notch of the first B-polarity deflection electrode is opposite to the notch of the second B-polarity deflection electrode, and the first B-polarity deflection electrode and the second B-polarity deflection electrode are in zero-resistance contact with each other.

5. The combined nozzle according to claim 1, characterized in that: The adjacent projection boundaries of the flight trajectories of the charged ink droplets of the first nozzle and the second nozzle on the second plane are collinear or equidistantly spaced, and the areas within the projection boundaries do not overlap with each other; the projection boundary of the flight trajectory of the charged ink droplets on the second plane is the straight line portion of the flight trajectory of the charged ink droplets with the smallest deflection amplitude under the deflection electric field or the straight line portion of the flight trajectory of the charged ink droplets with the largest deflection amplitude under the deflection electric field.

6. The combined nozzle according to claim 1, characterized in that: The projections of the virtual ejection points of the first nozzle and the second nozzle on the second plane coincide with each other, wherein the virtual ejection point of the nozzle represents the intersection point where the flight trajectory of a charged ink droplet with the smallest deflection amplitude of a nozzle and the flight trajectory of a charged ink droplet with the largest deflection amplitude intersect after the straight line portion under the deflection electric field is extended in the reverse direction.

7. The combined nozzle according to claim 5, characterized in that: The projections of the virtual ejection points of the first nozzle and the second nozzle on the second plane do not overlap, and when the adjacent projection boundaries of the flight trajectories of the charged ink droplets of the first nozzle and the second nozzle on the second plane are collinear, the projections of the virtual ejection points of the first nozzle and the second nozzle on the second plane are both located on the collinear projection boundaries; or, the projections of the virtual ejection points of the first nozzle and the second nozzle on the second plane do not overlap, and when the adjacent projection boundaries of the flight trajectories of the charged ink droplets of the first nozzle and the second nozzle on the second plane are equidistantly spaced, the projections of the virtual ejection points of the first nozzle and the second nozzle on the second plane are spaced in a manner consistent with the equidistant spacing; The virtual ejection point of the nozzle represents the intersection point where the flight trajectory of a charged ink droplet with the smallest deflection amplitude of the nozzle and the flight trajectory of a charged ink droplet with the largest deflection amplitude intersect after the straight line portion under the deflection electric field is extended in the reverse direction.

8. The combined nozzle according to claim 1, characterized in that: The first A polarity deflection electrode and the fourth A polarity deflection electrode are arranged in a manner to control the deflection electric field direction of the first nozzle, and the second A polarity deflection electrode and the third A polarity deflection electrode are arranged in a manner to control the deflection electric field direction of the second nozzle.

9. A coding device, characterized in that: It comprises a combined nozzle and a control unit as described in any one of claims 1 to 8, wherein the control unit divides the pattern to be printed on the printing surface of the substrate along the moving direction of the substrate to obtain sub-patterns to be printed, and allocates corresponding sub-patterns to be printed to the first nozzle and the second nozzle; the first nozzle and the second nozzle print the allocated sub-patterns under the control of the control unit.

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