Inkjet device

Abstract

To provide an ink jet device enabling improvement in reliability of a position of an ink jet head module.SOLUTION: An ink jet device includes: an ink jet head module having a nozzle; a subplate connected to the ink jet head module; and a base plate to which the subplate is connected. The subplate includes: a fastening part fastened to the ink jet head module; and a low rigidity part having lower rigidity than that of the fastening part.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present disclosure relates to an inkjet apparatus, and particularly to an inkjet apparatus in which an inkjet head module is fixed to a base plate via a sub-plate.

Background Art

[0002] In recent years, inkjet apparatuses such as inkjet printers and inkjet plotters have become widespread. Inkjet apparatuses are widely used not only in small-sized printers for general consumers, but also in industrial applications such as formation of electronic circuits, production of color filters for liquid crystal displays, and production of organic EL displays, for example.

[0003] An inkjet apparatus has a plurality of nozzles, and applies ink to a print target by ejecting ink from the nozzles while controlling the positional relationship between the nozzles and the print target.

[0004] As one type of such inkjet apparatuses, those provided with a plurality of line heads are known. Each line head includes a plurality of inkjet head modules arranged side by side in the width direction of a print target. Each inkjet head module is provided with a plurality of nozzles that eject ink.

[0005] By arranging a plurality of such line heads side by side in the sub-scanning direction orthogonal to the main scanning direction, ink can be applied over a wide range in a single scan to a wide print target. Furthermore, by arranging a plurality of line heads side by side also in the main scanning direction, a plurality of types of ink, for example inks of different colors, can be collectively applied to a print target in a single scan.

[0006] With this configuration, for example, even large printable objects of G4 size (680mm x 880mm) or larger can be coated with multiple types of ink in a single scan, thus reducing the cycle time required to coat the printable object with ink. Furthermore, because it is easier to ensure uniform drying conditions after ink application, there are advantages in the printing process, such as the ability to uniformly control the ink film thickness.

[0007] However, inkjet devices were considered unsuitable for forming high-resolution print patterns on large printable objects because it is difficult to precisely position a large number of inkjet head modules.

[0008] One method to overcome the shortcomings of such inkjet devices has been proposed in which the inkjet head module is fixed to the base plate via a subplate (see Patent Document 1). [Prior art documents] [Patent Documents]

[0009] [Patent Document 1] Japanese Patent Publication No. 2016-2672 [Overview of the project] [Problems that the invention aims to solve]

[0010] As described above, by adopting a configuration in which the inkjet head module is attached to the base plate via a subplate, the influence of the surface properties of the base plate can be reduced, and the reproducibility of the position when replacing the inkjet head module can be ensured. As a result, the reliability of the inkjet head module's position can be improved, and consequently, printing accuracy can be improved.

[0011] However, when using a subplate, the mechanical stress generated during the assembly of the inkjet head module has not been sufficiently considered, and it remains insufficient in terms of maintaining the position of the inkjet head module with high precision.

[0012] This disclosure has been made in consideration of the above points and provides an inkjet apparatus that can improve the reliability of the position of the inkjet head module. [Means for solving the problem]

[0013] One aspect of the inkjet apparatus disclosed herein is An inkjet head module having a nozzle, A subplate connected to the aforementioned inkjet head module, A base plate connected to the aforementioned subplate, Equipped with, The aforementioned subplate is At both ends of the subplate in the longitudinal direction, A fastening portion fastened to the inkjet head module, Provided between the fastening portions, A low-rigidity portion with lower rigidity than the aforementioned fastening portion, It holds. [Effects of the Invention]

[0014] According to this disclosure, an inkjet device can be realized that can improve the reliability of the position of the inkjet head module. [Brief explanation of the drawing]

[0015] [Figure 1] A schematic perspective view showing the general configuration of an inkjet device according to an embodiment. [Figure 2] A schematic perspective view showing the general configuration of the line head. [Figure 3] Cross-sectional view of the ink ejection unit [Figure 4] Plan view of an inkjet head module [Figure 5] Cross-sectional view of the subplate [Figure 6] Plan view of the subplate viewed from the Z direction [Figure 7] Plan view of the subplate viewed from the Y direction [Figure 8] Cross-sectional view of the subplate of Other Embodiment 1 [Figure 9] Plan view of the subplate of Other Embodiment 1 viewed from the Z direction [Figure 10] Plan view of the subplate of Other Embodiment 1 viewed from the Y direction [Figure 11] Cross-sectional view of the subplate of Other Embodiment 2 [Figure 12] Plan view of the subplate of Other Embodiment 2 viewed from the Z direction [Figure 13] Plan view of the subplate of Other Embodiment 2 viewed from the Y direction Description of Embodiments

[0016] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0017] <1> Schematic configuration of an inkjet apparatus FIG. 1 is a schematic perspective view showing the schematic configuration of an inkjet apparatus 10 according to an embodiment of the present disclosure. Since the feature of the inkjet apparatus of the present disclosure resides in the mounting structure of the inkjet head module, only the peripheral portion thereof is shown in FIG. 1, and the driving unit, control unit and the like are omitted.

[0018] FIG. 2 is a schematic perspective view showing the schematic configuration of one line head 20. FIG. 2 is a perspective view showing a part of the rectangular parallelepiped line head 20 viewed from an obliquely downward direction.

[0019] In the drawings, the X direction is a scanning direction, the Y direction is a sub-scanning direction, and the Z direction is an ejection direction of ink 50 (-Z direction in the drawings).

[0020] As can be seen from Figure 1, the inkjet device 10 has a plurality of line heads 20 and a stage 30. As can be seen from Figure 2, one line head 20 has a plurality of inkjet head modules 120 arranged in the sub-scanning direction. One inkjet head module 120 has a plurality of nozzles 130 arranged in the scanning direction.

[0021] In practice, one line head 20 uses one type of ink, so if multiple types of ink materials with different colors, viscosities, and electrical properties are used, a corresponding number of line heads 20 will be installed.

[0022] The stage 30 moves in the scanning direction (X direction) directly below the line head 20 with the object to be printed 40 placed on it. The object to be printed 40 may be, for example, recording paper, or it may be a color filter for a liquid crystal display or an organic EL display. Figure 1 shows an example where the object to be printed 40 is a color filter.

[0023] In the example shown in Figure 1, multiple line heads 20 are arranged in the scanning direction, which increases the number of ink types that can be applied to desired locations on the printing object 40 in a single scan of the stage 30. As a result, the number of scans can be reduced, and productivity can be improved.

[0024] The line head 20 is equipped with multiple ink ejection units 21-1, 21-2, ..., 21-n. The ink ejection units 21-1, 21-2, ..., 21-n are fixed to the base plate 22. In the following description, one or more ink ejection units may be abbreviated as ink ejection unit 21. In reality, the line head 20 is also equipped with wiring for sending electrical signals, but in Figure 2, only the essential components of the ink ejection unit 21 are shown for the sake of simplicity.

[0025] Each ink ejection unit 21 has a subplate 110 and an inkjet head module 120. The subplate 110 is fixed to the base plate 22 by fixing screws 111, and the inkjet head module 120 is fixed to the subplate 110 by fixing screws (not shown). In other words, the inkjet head module 120 is attached to the base plate 22 via the subplate 110.

[0026] The inkjet head module 120 is equipped with multiple nozzles 130, from which a predetermined amount of ink is ejected. The nozzles 130 are arranged linearly in the longitudinal direction (X direction) of the inkjet head module 120.

[0027] <2> Detailed configuration of the ink ejection unit 21 Next, the detailed configuration of the ink ejection unit 21 will be explained using Figures 3-7.

[0028] Figure 3 is a cross-sectional view of the ink ejection unit 21, cut along the XY plane at a position including the nozzle 130. Figure 4 is a plan view of the inkjet head module 120, viewed from the direction of the exposed surface of the nozzle 130. Figure 5 is a cross-sectional view of the subplate 110 extracted from the cross-sectional view of Figure 3. Figure 6 is a plan view of the subplate viewed from the Z direction. Note that Figure 5 can also be described as a cross-sectional view along line AA' in Figure 6. Figure 7 is a plan view of the subplate viewed from the Y direction.

[0029] Incidentally, in this embodiment, the X direction can be said to be the scanning direction and the arrangement direction of the multiple nozzles 130 in the inkjet head module 120. The Y direction can be said to be the sub-scanning direction and the arrangement direction of the multiple ink ejection units 21. The Z direction (more precisely, the -Z direction) can be said to be the ejection direction of the ink 50 and the stacking direction of the base plate 22, subplate 110, and inkjet head module 120.

[0030] The subplate 110 has a counterbore hole 111 that penetrates its thickness. The inkjet head module 120 has a screw hole 121. The subplate 110 and the inkjet head module 120 are fastened together by inserting a fixing screw (not shown) through the counterbore hole 111 and then screwing it into the screw hole 121. As a result, the inkjet head module 120 is fixed to the subplate 110, and the subplate 110 and the inkjet head module 120 are made into a single unit.

[0031] Here, the counterbore hole 111 is designed to have some radial clearance (in other words, some clearance) so that the inkjet head module 120 can slide slightly in the planar direction relative to the subplate 110 when a fixing screw (not shown) is inserted through it. This allows the mounting position of the inkjet head 120 on the subplate 110 to be adjusted within the range of this radial clearance.

[0032] Furthermore, reference holes 112 are formed near both ends of the subplate 110, penetrating its thickness. A reference hole 22a is formed at the position of the base plate 22 corresponding to the reference hole 112. By inserting a reference pin (not shown) so as to connect the reference holes 112 and 22a, the subplate 110 is positioned at a predetermined location on the base plate 22.

[0033] Furthermore, through holes 113 are formed near both ends of the subplate 110, penetrating its thickness. Screw holes 22b are formed at positions on the base plate 22 corresponding to the through holes 113. After positioning the subplate 110 at a predetermined location on the base plate 22 using a reference pin (not shown), fixing screws (not shown) are inserted through the through holes 113 and screwed into the screw holes 22b, thereby fixing the subplate 110 in its predetermined position on the base plate 22.

[0034] The reference pin (not shown) used for positioning may be left in place after being fixed with fixing screws (not shown), or it may be removed and shared for positioning other subplates. However, it is preferable to remove the reference pin and share the same reference pin for positioning multiple subplates, as this suppresses the decrease in positioning accuracy caused by errors in the reference pin compared to using different reference pins.

[0035] By attaching the inkjet head module 120 to the base plate 22 via the subplate 110, the positional relationship between the base plate 22 and the inkjet head module 120 can be adjusted by individually adjusting the positional relationship between the subplate 110 and the inkjet head module 120. This reduces the influence of the surface properties of the base plate 22 and ensures the reproducibility of the position when replacing the inkjet head module 120, thereby improving the reliability of the position of the inkjet head module 120.

[0036] Here, we will specifically explain the positional adjustment between the base plate 22 and the inkjet head module 120 using the subplate 110.

[0037] First, an alignment inspection process is performed on the assembled line head 20 to determine the alignment error, which is the misalignment of each inkjet head module 120. In the results of this alignment inspection process, any inkjet head modules 120 whose alignment error is outside the specifications are removed from the base plate 22 while the subplate 110 and the inkjet head module 120 are still fixed together.

[0038] Next, the relative positions of the subplate 110 and the inkjet head module 120 are adjusted by shifting the position of the inkjet head module 120 relative to the subplate 110 in order to eliminate alignment errors.

[0039] Next, the line head 20 is reconfigured by reattaching the subplate 110 and the inkjet head module 120 to the baseplate 22.

[0040] Here, the reproducibility of the mounting position of the subplate 110 relative to the base plate 22 is ensured by a reference pin (not shown). On the other hand, the reproducibility of the mounting position of the inkjet head module 120 relative to the base plate 22 is ensured by adjusting the relative positions of the subplate 110 and the inkjet head module 120.

[0041] Furthermore, by recording the alignment error obtained during the alignment inspection process, and shifting the new inkjet head module 120 relative to the subplate 110 to eliminate the alignment error in the event of a failure of the inkjet head module 120, the reproducibility of the relative position of the inkjet head module 120 with respect to the baseplate 22 can be ensured. Thus, it becomes possible to replace the inkjet head module 120 simply and with good reproducibility without having to readjust the entire line head 20.

[0042] In addition to the above configuration, as can be seen from Figures 5-7, the central part of the subplate 110 in the longitudinal direction has an opening 114a that penetrates the subplate 110 in the thickness direction (vertical direction (Z direction) in the figure), a notch 114b that cuts out the upper part of the subplate 110, and a notch 114c that cuts out the lower part of the subplate 110. The central part of the subplate 110 in the longitudinal direction is a low-rigidity part 114 due to the opening 114a and the thin-walled part formed by the notches 114b and 114c. Note that the opening is not limited to penetrating the subplate 110 in the thickness direction, but may also penetrate in other directions. For example, the opening may penetrate a part of the subplate 110 in the Y direction.

[0043] In this embodiment, the subplate 110 has a low-rigidity portion 114, which allows the stress caused by fastening when the subplate 110 and the inkjet head module 120 are fastened together with fixing screws to be mitigated by the deformation of the low-rigidity portion 114. As a result, deformation of the fastening portion due to fastening can be suppressed, and the accuracy of alignment can be maintained. In this specification, "stress" refers to axial stress and shear stress, etc., that are generated when the fixing screws are fastened.

[0044] Let me explain in more detail. When using a conventional subplate without the low-rigidity section 114, the stress caused by fastening was borne by the entire subplate. As a result, the stress caused by fastening extends to the entire subplate, and the fastening section, which is important for alignment, is also deformed by this stress, which may result in a decrease in the accuracy of the alignment.

[0045] In particular, if deformation caused by stress during fastening occurs at the time of fastening, the adverse effects of stress can be suppressed by fastening the subplate 110 and the inkjet head module 120 at a position that counteracts this deformation. However, if this deformation occurs gradually after fastening, the inkjet head module 120 will gradually shift as the inkjet device 10 is used, which can result in a decrease in printing accuracy.

[0046] In contrast, according to the configuration of this embodiment, the deformation of the low-rigidity portion 114 can alleviate the stress that occurs over time due to fastening, thereby suppressing the deformation of the fastening portion (which can also be called the high-rigidity portion) 115. As a result, the stress caused by fastening of the fastening portion 115, which is the most important aspect of alignment, is alleviated, and as a result, the positional accuracy of the fastening portion 115 can be maintained. Here, although deformation occurs in the central part of the subplate 110, since the deformation is at a position far from the fastening portion 115, the impact on the fastening portion 115 is small, and as a result, alignment accuracy is ensured.

[0047] As described above, the low-rigidity portion 114 is achieved by forming an opening 114a and thin-walled portions formed by notches 114b and 114c.

[0048] In practice, the effect can be fully realized if the width of the opening 114a in the Y direction is 1 / 10 or more of the total width of the subplate 110 in the Y direction. It is more preferable that the width of the opening 114a in the Y direction is about 4 / 5 of the total width of the subplate 110 in the Y direction. However, if the width of the opening 114a in the Y direction is too large, the overall strength of the subplate 110 will be too low, so it is preferable that the width of the opening 114a in the Y direction is 1 / 10 or more and 9 / 10 or less of the total width of the subplate 110 in the Y direction.

[0049] The effect of the opening 114a can be fully realized if the length of the opening in the X direction is at least one-third of the distance between the two counterbore holes 111 that are responsible for fastening to the inkjet head module 120. Furthermore, the length of the opening 114a in the X direction can be extended to the vicinity of the counterbore holes 111, as long as it is possible to machine the counterbore holes 111.

[0050] The combined depth of the notches 114b and 114c (i.e., the depth of the notches in the Z direction) is such that the combined depth of the notches 114b and 114c is at least half the thickness of the subplate 110, meaning that the remaining thickness (i.e., the thickness of the thinned portion of the subplate 110, which is thinner than the fastening portion 115) is at least half. The effect can be fully realized if this combined depth of the notches 114b and 114c is at least 4 / 5 the thickness of the subplate 110. However, if the combined depth of the notches 114b and 114c is too deep, the overall strength of the subplate 110 will be too low. Therefore, it is preferable that the combined depth of the notches 114b and 114c is at least 1 / 10 of the thickness of the subplate 110 and at least 1 / 2 (i.e., the remaining thickness is at least 1 / 2 of the thickness of the subplate 110 and at least 9 / 10). In other words, it is preferable that the notch depth < the remaining thickness.

[0051] <3> effect As described above, according to this embodiment, the system comprises an inkjet head module 120 having a nozzle 130, a subplate 110 connected to the inkjet head module 120, and a base plate 22 connected to the subplate 110. The subplate 110 has a fastening portion 115 fastened to the inkjet head module 120 and a low-rigidity portion 114 which has lower rigidity than the fastening portion 115.

[0052] As a result, the deformation of the low-rigidity part 114 can alleviate the stress that occurs over time due to fastening, thereby suppressing the deformation of the fastening part 115 and maintaining the positional accuracy of the fastening part 115. Consequently, an inkjet device 10 can be realized that can improve the reliability of the position of the inkjet head module 120.

[0053] <4> Other embodiments <4-1>Other Embodiments 1 Figures 8-10, which use the same reference numerals to indicate the corresponding parts in Figures 5-7, show the configuration of the subplate 110 of another embodiment 1. Figure 8 is a cross-sectional view of the subplate 110 of another embodiment 1, Figure 9 is a plan view of the subplate 110 of another embodiment 1 as seen from the Z direction, and Figure 10 is a plan view of the subplate 110 of another embodiment 1 as seen from the Y direction.

[0054] The difference between the subplate 110 of another embodiment 1 and the subplate 110 of the above-described embodiment is that the depth of the notches 214b and 214c increases toward the center of the subplate 110. As a result, the low-rigidity portion 214 gradually becomes thinner from the end towards the center, and therefore its rigidity gradually decreases from the end towards the center. In other words, the low-rigidity portion 214 has a rigidity characteristic in which its rigidity decreases as it moves away from the fastening portion 115. To put it another way, the low-rigidity portion 214 has a first low-rigidity portion and a second low-rigidity portion which is further away from the fastening portion 115 than the first low-rigidity portion, and the second low-rigidity portion has lower rigidity than the first low-rigidity portion.

[0055] As a result, compared to the above-described embodiment, the stress caused by fastening is mitigated by deformation at a position further away from the fastening portion 115, making it less likely for the fastening portion 115 to shift position due to stress, and consequently, the accuracy of the position of the fastening portion 115 can be maintained more reliably.

[0056] <4-2>Other Embodiments 2 Figures 11-13, which use the same reference numerals to indicate the corresponding parts in Figures 5-7, show the configuration of the subplate 110 of another embodiment 2. Figure 11 is a cross-sectional view of the subplate 110 of another embodiment 2, Figure 12 is a plan view of the subplate 110 of another embodiment 2 viewed from the Z direction, and Figure 13 is a plan view of the subplate 110 of another embodiment 2 viewed from the Y direction.

[0057] The difference between the subplate 110 of the other embodiment 2 and the subplate 110 of the embodiment described above is that the opening 314a extends to the position of the counterbore hole 111. As a result, the opening 314a and the counterbore hole 111 can be formed in one step, which reduces the number of tool changes and shortens the machining time.

[0058] The opening 314a consists of an opening 314a1 having the same shape as the opening 114a in the above-described embodiment, and openings 314a2 formed on both sides thereof. The openings 314a2 are narrower in width than the opening 314a. The opening 314a in this embodiment is longer in overall length compared to the opening 114a in the above-described embodiment, and the low-rigidity portion 314 in this embodiment is longer in overall length compared to the low-rigidity portion 114 in the above-described embodiment.

[0059] This expands the range over which stress caused by fastening can be alleviated, allowing for more reliable stress relief and reducing the impact of stress on the fastening portion 115. However, since the opening 314a extends to the counterbore hole 111, deformation due to stress will extend to the fastening portion 115, which is important for positioning. However, the subplate 110 and the inkjet head module 120 can be fastened at a position that anticipates deformation during fastening.

[0060] <4-3> Further embodiments, The embodiments described above are merely examples of how the present invention can be implemented, and the technical scope of the present invention should not be interpreted as being limited by them. In other words, the present invention can be implemented in various forms without departing from its gist or its main features.

[0061] In the above-described embodiment, the low-rigidity portion 114 was realized by forming an opening 114a and notches 114b and 114c. However, the low-rigidity portion 114 may also be realized by forming, for example, only the opening 114a, only the notch 114b, or only the notch 114c. Similarly, in the other embodiment 1, the low-rigidity portion 214 may also be realized by forming, for example, only the opening 114a, only the notch 214b, or only the notch 214c. Similarly, in the other embodiment 2, the low-rigidity portion 314 may also be realized by forming, for example, only the opening 314a, only the notch 114b, or only the notch 114c.

[0062] In the embodiments described above and other embodiments 1 and 2, the low-rigidity sections 114, 214, and 314 were realized by openings 114a, 314a and notches 114b, 114c, and 214. However, the invention is not limited to this, and the low-rigidity sections may also be realized by using a material with lower rigidity than the fastening section, for example. Even in this case, as in the embodiments described above, the stress generated in the subplate by the fastening of the fastening section can be alleviated by deformation, and the same effects as in the embodiments described above can be obtained. However, as in the embodiment described above, if the low-rigidity parts 114, 214, and 314 have a shape (openings 114a, 314a, notches 114b, 114c, and 214) that alleviates the stress generated in the subplate 110 by the fastening of the fastening part 115, then the subplate 110 having the low-rigidity parts 114, 214, and 314 can be formed from the same material. As a result, there is an advantage in that the subplate 110 having the low-rigidity parts 114, 214, and 314 can be easily realized compared to realizing the low-rigidity parts from a different material.

[0063] In the above-described embodiment and other embodiments 1 and 2, the case where the fastening portion 115 is formed at two positions on the subplate 110 was described, but the number of fastening portions is not limited to this, and this disclosure can also be applied when there are three or more fastening portions. In short, it is sufficient to form low-rigidity portions, which have lower rigidity than the fastening portions, at positions other than the multiple fastening portions and between the multiple fastening portions. However, as shown in the embodiment and other embodiments 1 and 2, forming low-rigidity portions between fastening portions allows the stress of multiple fastening portions to be relieved by a common low-rigidity portion, so that stress can be efficiently relieved with a small number or small area of ​​low-rigidity portions.

[0064] The number and arrangement of nozzles 130, the number and arrangement of discharge units 21, the number and arrangement of fastening parts 115, the number and arrangement of low-rigidity parts 114, 214, 314, the number and arrangement of openings 114a, 314a, the number and arrangement of notches 114b, 114c, 214, etc., in the above-described embodiment and other embodiments 1 and 2 are illustrative examples and can be modified within a range that does not deviate from the gist or main features thereof, for example, depending on the specifications required for the inkjet device. [Industrial applicability]

[0065] The inkjet apparatus of this disclosure is broadly applicable to inkjet apparatuses in which an inkjet head module having nozzles is mounted on a base plate via a subplate. [Explanation of Symbols]

[0066] 10. Inkjet device 20 line heads 21 (21-1, 21-2, ..., 21-n) Ink ejection unit 22 Base Plate 22a, 112 reference hole 30 stages 40. Printable items 50 ink 110 Subplate 111 Counterbore holes 113 Through hole 114, 214, 314 Low rigidity part 114a, 314a, 314a1, 314a2 opening 114b, 114c, 214b, 214c Notches 115 Fastening part 120 Inkjet Head Modules 121, 22b Screw holes 130 nozzles

Claims

1. Inkjet device, An inkjet head module having a nozzle, A subplate connected to the aforementioned inkjet head module, A base plate connected to the aforementioned subplate, Equipped with, The aforementioned subplate is At both ends in the longitudinal direction of the subplate, fastening portions are provided for fastening to the inkjet head module, A low-rigidity portion is provided between the fastening portions and has lower rigidity than the fastening portions, Having Inkjet printer.

2. The low-rigidity portion has a shape that alleviates the stress generated in the subplate by the fastening of the fastening portion. The inkjet apparatus according to claim 1.

3. The subplate has a plurality of fastening portions, The low-rigidity portion is positioned between the plurality of fastening portions. The inkjet apparatus according to claim 1.

4. The low-rigidity portion includes an opening that penetrates the subplate, The inkjet apparatus according to any one of claims 1 to 3.

5. The low-rigidity portion includes a thin-walled portion that is thinner than the fastening portion. The inkjet apparatus according to any one of claims 1 to 3.

6. The low-rigidity portion has a rigidity characteristic in which its rigidity gradually decreases as it moves away from the fastening portion. The inkjet apparatus according to claim 1.

7. The inkjet apparatus according to claim 1, wherein the longitudinal direction is the direction of arrangement of the nozzles.

8. The inkjet apparatus according to claim 1, wherein the fastening portion is located on the end side in the longitudinal direction of the nozzle.

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