Liquid ejecting device, reservoir, and ink jet recording method

Abstract

A liquid jetting device includes: a jet head for jetting liquid; a container for storing liquid; and a reservoir that supplies liquid to the jet head and stores liquid supplied from the container. The reservoir includes: a first chamber for storing liquid; a second chamber disposed downstream of the first chamber and storing liquid; and a first flow path and a second flow path that communicates the first and second chambers with each other. In an operating configuration of the liquid jetting device, the connection between the first chamber and the second flow path is positioned lower than the connection between the first chamber and the first flow path. The second flow path is configured such that as the flow rate of the liquid flowing within the second flow path increases, the pressure loss rate increases. A reservoir and a method for inkjet recording using the liquid jetting device are also disclosed.

Description

Technical Field

[0001] This invention relates to a liquid jetting device, a storage device, and an inkjet recording method. Background Technology

[0002] As a liquid ejection device, inkjet printers are known to perform recording (printing) by ejecting ink, which is a liquid, from the ejection nozzle of a printhead onto a medium. Such inkjet printers include a printhead for ejecting ink and a supply path for supplying liquid stored in a container to the printhead. Some inkjet printers also include a reservoir configured to temporarily store a certain amount of liquid and connected to the printhead. When an inkjet printer with this configuration performs recording, liquid is supplied to the printhead not only from the container but also from the reservoir (which is connected to and located near the printhead), thereby preventing blurring during high-volume recording or at the beginning of recording.

[0003] Japanese Patent No. 6578888 discloses a liquid injection device comprising a reservoir including: a first storage chamber capable of storing ink as a liquid; a second storage chamber disposed upstream of the first storage chamber on a supply path side, also capable of storing ink; an upper supply path connecting the first and second storage chambers; and a lower supply path below the upper supply path connecting the first and second storage chambers. In the reservoir described in Japanese Patent No. 6578888, when suction is performed from the ink outlet of the first storage chamber, ink flows into the second storage chamber from the supply path. With relatively high suction flow, the pressure loss in the lower supply path increases, causing some of the ink flowing into the second storage chamber to not flow into the first storage chamber, thus filling the second storage chamber with ink. When suction stops, ink moves from the second storage chamber to the first storage chamber. On the other hand, when the ink flow rate in the reservoir is relatively low during recording, the pressure loss in the lower supply path decreases proportionally to the flow rate, causing ink to flow from the second reservoir chamber to the first reservoir chamber and then to the print head. During recording, the ink filling the first and second reservoir chambers and located near the print head is supplied to the print head, thereby suppressing blurring during recording at higher flow rates or at the beginning of recording.

[0004] In the storage device described in Japanese Patent No. 6578888, if the pressure loss in the lower supply path is insufficient when the second storage chamber is filled with liquid, a large amount of ink will also flow into the first storage chamber downstream. The liquid flowing into the first storage chamber is then discharged from the ejector head as waste ink. If the pressure loss in the lower supply path is designed to be large, ink may not be supplied from the second storage chamber during recording, potentially resulting in insufficient ink supply to the ejector head, leading to ejection failure and a blurry printed image. As described above, the magnitude of the pressure loss in the lower supply path affects both the reduction of waste ink during filling and the suppression of blur in the printed image, and these two factors are in a trade-off relationship. Summary of the Invention

[0005] The present invention provides a liquid jetting device that reduces waste ink during liquid filling and suppresses blurring during recording.

[0006] According to one aspect of the invention, a liquid injection device includes: a nozzle configured to inject liquid; a container configured to store liquid; and a reservoir configured to supply liquid to the nozzle and store liquid supplied from the container. The reservoir includes: a first liquid chamber configured to store liquid; a second liquid chamber configured to store liquid and disposed downstream of the first liquid chamber, the downstream side being closer to the nozzle; and a first communicating flow path and a second communicating flow path, the first and second communicating flow paths communicating with each other. In the operating configuration of the liquid injection device, the connection between the first liquid chamber and the second communicating flow path is positioned lower than the connection between the first liquid chamber and the first communicating flow path. The second communicating flow path is configured such that the pressure loss rate increases as the flow rate of the liquid flowing within the second communicating flow path increases.

[0007] Other features of the invention will become clear from the following description of the embodiments with reference to the accompanying drawings. Attached Figure Description

[0008] Figure 1 This is a view illustrating an example of a liquid injection device according to an embodiment of the present invention.

[0009] Figure 2 This is a schematic cross-sectional view showing an example of a liquid injection device according to an embodiment.

[0010] Figure 3 This is a perspective view showing an example of an injection head and an example of a storage device according to an embodiment.

[0011] Figure 4A and4B Each is a view representing a storage instance according to an embodiment.

[0012] Figure 5 This is a perspective view representing a storage instance according to an embodiment.

[0013] Figure 6A and 6B They are respectively along Figure 5 The cross-sectional view of the memory is taken by lines XIa-XIa and XIb-XIb.

[0014] Figure 7 This is a view showing the state of the reservoir according to an embodiment when it is filled with liquid.

[0015] Figure 8 This is a view showing the state of the storage device at the time of recording, according to an embodiment.

[0016] Figure 9 This is a view that shows the state of the reservoir when it is filled with liquid, based on the comparison instance.

[0017] Figure 10 It is a view that represents the state of the memory at the time of recording, based on the comparison instance.

[0018] Figure 11A and 11B These are views showing the pressure loss relative to the liquid flow rate in the second connected flow path according to the comparative example and the embodiment, respectively.

[0019] Figures 12A to 12C This is a view representing an instance of a second connected flow path according to an embodiment.

[0020] Figures 13A to 13C This is a view representing another instance of the second connected flow path according to an embodiment.

[0021] Figures 14A to 14C This is a view representing yet another instance of a second connected flow path according to an embodiment.

[0022] Figure 15 This is an exploded perspective view representing an instance of a storage device according to an embodiment. Detailed Implementation

[0023] Figure 1 This is a perspective view showing the main parts of an inkjet printer 1, which serves as an example of a liquid jetting apparatus to which embodiments of the present invention can be applied. The inkjet printer 1 performs recording on the medium 6 by alternately moving the printhead 5 along the main scanning direction (X direction) and moving the medium 6 along a sub-scanning direction A orthogonal to the main scanning direction, ejecting ink, as a liquid, from the printhead 5 onto the medium 6. Figure 1In the diagram, the Z direction is the vertically upward direction, the X direction is the width direction of medium 6, and the Y direction is the opposite direction to the transmission direction of medium 6 (sub-scanning direction A).

[0024] The inkjet printer 1 includes: a carriage 2 on which a printhead 5 is mounted and reciprocates; a transport roller 3 for transporting media 6; a container 200 for storing liquid; and a tube 4 connecting the container 200 and the printhead 5. The inkjet printer 1 also includes a first shaft 8 and a second shaft 9 for guiding the movement of the carriage 2, and a cover unit 7 for covering the printhead 5. When liquid is not ejected from the printhead 5, the printhead 5 is in standby position at the cover unit 7, where the nozzle portion of the printhead 5 is sealed by the cover in the cover unit 7. Each container 200 includes a refill port 201, allowing direct replenishment of the container 200 with liquid.

[0025] Figure 2 This is a schematic cross-sectional view showing the liquid flow path in inkjet printer 1. Liquid stored in container 200 is first supplied through pipe 4 to reservoir 100 connected to printhead 5. Then, the liquid is supplied from reservoir 100 to printhead 5 through filter 19, thereby causing the liquid to be ejected (printing) onto media 6. In this embodiment, pipe 4, reservoir 100, and filter 19 form a supply path for supplying ink stored in container 200 to printhead 5. Figure 2 This indicates the state immediately following the supply of ink 210 from container 200 to tube 4. The reservoir 100, connected to the print head 5, is configured to reciprocate along a predetermined direction with the print head 5. The reservoir 100, connected to the print head 5 and located closer to the print head 5 than container 200, stores a certain amount of liquid. Thus, the reservoir 100 prevents blurring of the print on the medium 6 during high-flow-rate recording or at the start of recording. The detailed structure of the reservoir 100 will be described below.

[0026] Figure 3 This is a perspective view of the nozzle 5 connected to the storage unit 100. Figure 4A This is a perspective view of storage 100. Figure 4B The storage unit 100 on the XZ plane is shown. In this embodiment, as an example, four types of ink (black, cyan, magenta, and yellow) to be ejected from the ejector head 5 are stored in four containers 200 (200K, 200C, 200M, and 200Y, see...) Figure 1The inkjet printer 1 is stored in four memory cells 100 (100K, 100C, 100M, and 100Y). In this embodiment, the inkjet printer 1 uses four ink colors, but the number of ink colors to be used is not limited to four. The inkjet printer 1 can use multiple ink colors different from the four ink colors or use only a single ink color. The inkjet printer 1 can also jet liquids different from ink, such as reactive liquids.

[0027] As described above, the inkjet printer 1 includes a cover unit 7 for covering the printhead 5. The cover unit 7 includes a suction pump (not shown). This suction pump operates with the nozzle portion of the printhead 5 sealed by the cover to perform suction inside the cover. In other words, the suction pump is capable of performing a suction operation from the outside of the printhead 5. This suction operation enables the inkjet printer 1 to initially fill the printhead 5 and the reservoir 100 with ink and perform a suction and discharge operation of ink from the nozzle portion.

[0028] The structure of memory 100 will be described in detail below.

[0029] like Figure 2 As shown, each reservoir 100 includes: a first liquid chamber 110 located upstream along the ink flow direction and connected to the tube 4; a second liquid chamber 120 located on the side of the ejector head 5 (which is downstream along the ink flow direction) and connected to the ejector head 5; and a first connecting flow path 130 and a second connecting flow path 140 that connect the first liquid chamber 110 and the second liquid chamber 120 to each other. In the operating posture of the liquid ejection device, the connection between the first liquid chamber 110 and the second connecting flow path 140 is positioned lower than the connection between the first liquid chamber 110 and the first connecting flow path 130.

[0030] Figure 5 This is a perspective view of a memory 100 configured to store ink of a single color. Figure 5 In the diagram, the internal structure of the memory 100 is also represented by solid lines. Figure 6A yes Figure 5 YZ cross-sectional view of the storage 100 at the location where it intersects with the second connected flow path 140 along line XIa-XIa. Figure 6B yes Figure 5 YZ cross-sectional view of the reservoir 100 at the location where it intersects with the second liquid chamber 120 along line XIb-XIb.

[0031] exist Figure 5 , 6AIn the example of the reservoir 100 shown in 6B, the first liquid chamber 110 includes an inlet 1001 and an inlet path 1002. Ink supplied from the tube 4 is supplied to the first liquid chamber 110 through the inlet 1001 and then through the inlet path 1002. Figure 6A In the diagram, the location of the introduction path 1002 along the depth direction is indicated by a dashed line. The outlet 1003 is located in the second liquid chamber 120 and is connected to the injection head 5 via a filter 19 (see...). Figure 2 ).

[0032] The second liquid chamber 120 and the second connecting flow path 140 are arranged horizontally along their shorter sides, more specifically, along a direction substantially orthogonal to the liquid injection direction (the second orthogonal direction). In other words, the second liquid chamber 120 and the second connecting flow path 140 are arranged at a position where they overlap each other along the X direction. With this arrangement, all liquid chambers and flow paths are arranged in the same plane (i.e., the YZ plane, as shown in the image). Figure 2 Compared to the case shown), this allows for miniaturization of the storage unit 100. However, the positional relationship between the second liquid chamber 120 and the second connecting flow path 140 is not limited to this. For example, the second liquid chamber 120 and the second connecting flow path 140 can be arranged to overlap each other along the Z direction. Regarding the positional relationship between the first liquid chamber 110 and the second liquid chamber 120, in Figure 5 In this configuration, the second liquid chamber 120 is located vertically below the first liquid chamber 110. However, the positional relationship is not limited to this. For example, the first liquid chamber 110 and the second liquid chamber 120 can be arranged side by side in a horizontal direction, or they can be in any other positional relationship.

[0033] exist Figure 5 In this process, the second connecting flow path 140 has a shape that extends in a direction substantially orthogonal to the liquid jet direction (the first orthogonal direction), i.e., in the horizontal direction. Therefore, even when the ink level in the second liquid chamber 120 decreases during recording, it is possible to easily supply ink to the jet head 5 without interruption.

[0034] The function of the storage device 100 and the ideal behavior of ink in the storage device 100 will be described below. Figures 7 to 10 This is a schematic diagram illustrating the behavior of ink in the storage device 100, and corresponds to... Figure 6A A cross-sectional view of an example of the storage 100 shown. Figures 7 to 10 The dashed line in the diagram indicates the location of the introduced path 1002 in the memory 100.

[0035] When filling, such as Figure 7As shown, ink is drawn from the nozzle 5 side, and the ink supplied from the inlet 1001 fills the first liquid chamber 110 (this is referred to as the filling process). The ink flow rate during filling (hereinafter referred to as the filling flow rate) is greater than the flow rate during recording (hereinafter referred to as the recording flow rate), and the pressure loss in the second connecting flow path 140 is relatively large during filling. Therefore, most of the ink supplied from the inlet path 1002 is stored in the first liquid chamber 110, rather than in the second connecting flow path 140 and the second liquid chamber 120.

[0036] On the other hand, the recording flow rate (hereinafter also referred to as the jetting process) is less than the filling flow rate, and the pressure loss in the second connecting flow path 140 is relatively small during recording. Therefore, as Figure 8 As shown, ink stored in the first liquid chamber 110 and ink supplied from the inlet 1001 are ejected from the nozzle 5 through the second connecting flow path 140.

[0037] The following description will refer to a comparative example of the present invention. As a comparative example, consider a reservoir 100, wherein the second connecting flow path 140 is a straight pipe and does not have the following feature of this embodiment (described later): when the flow rate of the liquid flowing in the second connecting flow path 140 increases, the pressure loss rate in the second connecting flow path 140 increases.

[0038] Figure 9 This indicates the internal state of the reservoir 100 when the pressure loss in the second connected flow path 140 is too small under the filled flow rate. Figure 7 The conditions are different. If the pressure loss in the second connecting flow path 140 is too small, the ink flows to the second liquid chamber 120 side through the second connecting flow path 140 with smaller pressure loss. Therefore, the first liquid chamber 110 is not filled with ink, and all the ink supplied from the container 200 to the reservoir 100 is discharged from the nozzle 5 as waste ink.

[0039] Figure 10 This is a schematic diagram illustrating the ink in the reservoir 100 under the condition that the pressure loss in the second connecting flow path 140 is too large at the recorded flow rate. Under the condition that the pressure loss in the second connecting flow path 140 is too large, as described above... Figure 8The conditions are different. Even at a recording flow rate less than the filling flow rate, the amount of ink passing through the second connecting flow path 140 is very small, with most of the ink filling the first liquid chamber 110. If the amount of ink ejected from the ejector head 5 exceeds the amount of ink supplied to the second liquid chamber 120 through the second connecting flow path 140, the ink supply to the ejector head 5 cannot keep up with the recording, resulting in blurry printing. Therefore, the pressure loss in the second connecting flow path 140 should be kept sufficiently small to prevent interruption of the ink supply to the second liquid chamber 120 at the expected recording flow rate.

[0040] Figure 11A The graph shows the pressure loss versus flow rate in the second connecting flow path 140 according to a comparative example, in which the second connecting flow path 140 is a straight pipe. As mentioned above, the second connecting flow path 140 is ideally designed such that the pressure loss in the second connecting flow path 140 is small at recording flow rates. However, in this case, the amount of waste ink may increase at filling flow rates (see...). Figure 11A (Line I in the diagram). Conversely, if the second connecting flow path 140 is designed to increase pressure loss, the amount of waste ink decreases at the fill flow rate, but the ink supply to the second liquid chamber 120 is interrupted at the recording flow rate, and the printed image may be blurry (see line I in the diagram). Figure 11A (Line II in the text). As mentioned above, there is a trade-off between reducing waste ink during filling and suppressing blur during recording.

[0041] To address this issue, the reservoir 100 according to this embodiment has the following characteristic: when the flow rate of ink flowing within the second connecting flow path 140 increases, the pressure loss rate in the second connecting flow path 140 increases. In this case, the correlation between pressure loss and flow rate in the second connecting flow path 140 has a downward convex shape, such as... Figure 11B As shown. In this case, the pressure loss in the second connected flow path 140 can be reduced at the recording flow rate and increased at the filling flow rate, thus reducing the amount of waste ink during ink filling and suppressing blurring during recording.

[0042] like Figure 11BAs shown, when the flow rate increases, the pressure loss in the second connecting flow path 140 according to this embodiment increases, and the pressure loss rate also increases with the flow rate. In a comparative example where the second connecting flow path 140 is a straight pipe, the pressure loss in the second connecting flow path 140 increases proportionally with the flow rate, while the pressure loss in the second connecting flow path 140 according to this embodiment increases exponentially with respect to the flow rate. Therefore, at a recording flow rate (which is a relatively small flow rate), the pressure loss in the second connecting flow path 140 can be made sufficiently small to prevent blurry printing, and at a fill flow rate greater than the recording flow rate, the pressure loss in the second connecting flow path 140 can be made sufficiently large to minimize waste ink. If a relationship between the pressure loss in the second connecting flow path 140 and the ink flow rate is established within the ink flow rate range (including the recording flow rate and the fill flow rate) (e.g.) Figure 11B As shown, the effects of this embodiment can be obtained for the ink (liquid) used in the inkjet printer 1 (liquid jet device).

[0043] To achieve a high level of reduction in waste ink during filling and suppression of blurring during recording, it is ideal that the ratio of the pressure loss in the second connected flow path 140 at the filling flow rate to the pressure loss in the second connected flow path 140 at the recording flow rate is more than 2 and less than 100. More ideally, this ratio is more than 8 and less than 100, and even more ideally, more than 20 and less than 100.

[0044] The shape of the second connected flow path 140 in the reservoir 100 according to this embodiment will now be described. An example of the second connected flow path 140 is a flow path with a specific shape, comprising a main flow path 141 and a sub-flow path 142, the sub-flow path 142 branching from the main flow path 141 and then connecting to the main flow path 141 downstream along the liquid flow direction, such as... Figure 12A As shown. At the confluence portion 143 where the sub-flow path 142 connects to the main flow path 141, the sub-flow path 142 connects to the main flow path 141 in a direction perpendicular to the main flow path 141 or in a direction that obstructs the ink flow in the main flow path 141. More specifically, the sub-flow path 142 has a loop shape relative to the main flow path 141. Figure 12B and 12C These are schematic diagrams illustrating ink flow under low and high flow conditions, respectively. Figure 12B and 12C The direction and size of the arrows indicate the flow direction and flow rate of the ink. When the flow rate of ink in the second connected flow path 140 is relatively small, the ink flows through the main flow path 141 and the sub-flow path 142, such as... Figure 12BAs shown, when the flow rate increases, more ink flows into the sub-flow path 142, as... Figure 12C As shown. When the ink in the sub-flow path 142 merges with the ink in the main flow path 141, the ink flowing in the sub-flow path 142 merges at the merging portion 143 in a direction that obstructs the flow of ink in the main flow path 141. Therefore, the ink in the sub-flow path 142 that merges with the ink in the main flow path 141 acts as a flow resistance against the ink flowing in the main flow path 141. When the flow rate further increases, the amount of ink flowing into the sub-flow path 142 also increases, and therefore, the flow resistance received by the ink flowing in the main flow path 141 also increases. At this time, an ink vortex 211 is generated in the merging portion 143. Therefore, the pressure loss in the second connecting flow path 140 further increases. As described above, in having Figures 12A to 12C In the second connected flow path 140 of the shape shown, the pressure loss increases exponentially with the increase of ink flow rate.

[0045] Figures 12A to 12C The second connecting flow path 140 shown is more ideally a Tesla valve, configured to allow liquid to flow from the first liquid chamber 110 to the second liquid chamber 120, and conversely, to impede liquid flow from the second liquid chamber 120 to the first liquid chamber 110. In this configuration, the pressure loss in the second connecting flow path 140 between filling and recording can be further increased, and the effects of this embodiment—reduced waste ink during filling and suppression of blurring during recording—can be further achieved.

[0046] As another example of the shape of the second connecting flow path 140 (where the pressure loss rate increases as the flow rate of the liquid flowing within the second connecting flow path 140 increases), its shape has two or more continuous variations (expansion and contraction of the flow path width), resulting in a change in the cross-sectional area of ​​the flow path. More specifically, a flow path with a shape including multiple expansion portions 144, each expansion portion 144 having a wider flow path width, such as... Figures 13A to 13C As shown, or a flow path with a shape that includes obstacles 145 in the flow path can be used, such as Figures 14A to 14C As shown. Figure 13B and 14B This is a schematic diagram illustrating ink flow in the second connected flow path 140, where the ink flow rate is recorded. Because the ink flow rate is relatively small, therefore... Figure 13B In this process, the ink significantly alters its flow width within the expansion section 144 as it flows. Figure 14B In the middle, the ink flows around the obstacle 145. Figure 13C and 14CThis is a schematic diagram illustrating ink flow in the second connected flow path 140 at a filling flow rate. Because the ink flow rate is relatively large, therefore... Figure 13C In this process, ink vortices 211 are generated in each expansion section 144. These vortices 211 prevent ink from flowing as the flow width within the expansion section 144 expands, thus increasing pressure loss due to the narrowing of the actual flow path width. Figure 14C In this process, vortices 211 are generated downstream of each obstacle 145 along the ink flow direction. Therefore, due to the narrowing of the actual flow path width, pressure loss increases. The vortices 211, which contribute to the increased pressure loss with increasing flow rate, increase with increasing ink flow rate. Therefore, when the flow rate of ink flowing in the second connecting flow path 140 increases, the pressure loss in the second connecting flow path 140 increases, and the pressure loss rate also increases with increasing ink flow rate. Figures 13A to 13C As shown, in a shape comprising multiple expansion portions 144 (each expansion portion 144 having a relatively wide flow path width), the number of expansion portions 144 is ideally two or more, and more preferably three or more. Furthermore, as... Figures 14A to 14C As shown, in the shape including the obstacle 145 in the flow path, the number of obstacles 145 is ideally two or more, more ideally three or more.

[0047] In having the above-mentioned Figure 12A , 13A In the second connected flow path 140 of the shape shown in 14A, when the ink flow rate is below 10 ml / min, no eddies 211 are generated in the second connected flow path 140 (see...). Figure 12B , 13B (and 14B), when the flow rate is above 40 ml / min, eddies 211 are generated in the second connected flow path 140 (see 14B). Figure 12C , 13C (and 14C). Therefore, it is ideal to configure the liquid jetting device such that the recording flow rate is less than 10 ml / min and the filling flow rate is more than 40 ml / min.

[0048] The method for manufacturing the memory 100 according to this embodiment will now be described. Figure 15 This is an exploded perspective view of the reservoir 100. As described above, the reservoir 100 according to this embodiment ideally has a configuration in which the second liquid chamber 120 and the second communicating flow path 140 overlap each other in the horizontal direction. Therefore, the reservoir 100 is formed by arranging the flow path component 151 in a generally cuboid space (space 1500) contained in the box-shaped component 150 and sealing its upper portion with the cover component 152. Figure 15As an example, the cartridge component 150 includes four compartments 1500 (1500K, 1500C, 1500M, and 1500Y) for storing four types of ink (black, cyan, magenta, and yellow). Figure 15 As shown, the flow path component 151 divides each space 1500 into two spaces, serving as the first liquid chamber 110 and the second liquid chamber 120 (see...). Figure 6B The flow path component 151 also forms a first communicating flow path 130, serving as a space along the +Y direction between the flow path component protrusion 1511 and the inner wall of the box-shaped component 150. Additionally, a groove for forming a second communicating flow path 140 is formed on the flow path component sidewall 1512 of the flow path component 151, and the second communicating flow path 140 is formed by covering the groove along the -X direction with the inner wall of the box-shaped component 150. The reservoir 100 has the configuration formed as described above, thus enabling a compact formation of the reservoir 100 while reducing the number of components.

[0049] Using the above-described structure, a liquid jetting device is provided that reduces waste ink during liquid filling and suppresses blurring during recording.

[0050] While the invention has been described with reference to embodiments, it should be understood that the invention is not limited to the disclosed embodiments. The scope of the appended claims should be interpreted in the broadest sense to cover all such variations and equivalent structures and functions.

Claims

1. A liquid injection device, comprising: The spray head is configured to spray liquid; A container configured to store liquid; as well as A storage container configured to supply liquid to the nozzle and store liquid supplied from the container; The reservoir includes: a first liquid chamber configured to store liquid; a second liquid chamber configured to store liquid and disposed downstream of the first liquid chamber, the downstream side being closer to the nozzle; and a first connecting flow path and a second connecting flow path, the first connecting flow path and the second connecting flow path enabling the first liquid chamber and the second liquid chamber to communicate with each other. Wherein, in the operating posture of the liquid injection device, the connection port between the first liquid chamber and the second connecting flow path is positioned lower than the connection port between the first liquid chamber and the first connecting flow path; and The second connected flow path is configured such that when the flow rate of the liquid flowing inside the second connected flow path increases, the pressure loss rate increases.

2. A liquid injection device, comprising: The spray head is configured to spray liquid; A container configured to store liquid; as well as A storage container configured to supply liquid to the nozzle and store liquid supplied from the container; The reservoir includes: a first liquid chamber configured to store liquid; a second liquid chamber configured to store liquid and disposed downstream of the first liquid chamber, the downstream side being closer to the nozzle; and a first connecting flow path and a second connecting flow path, the first connecting flow path and the second connecting flow path enabling the first liquid chamber and the second liquid chamber to communicate with each other. In the operating posture of the liquid injection device, the connection between the first liquid chamber and the second connecting flow path is positioned lower than the connection between the first liquid chamber and the first connecting flow path. The second connecting flow path includes a main flow path and a sub-flow path, wherein the sub-flow path branches off from the main flow path and then merges back into the main flow path downstream along the liquid flow direction; and Wherein, at the point where the sub-flow path merges with the main flow path, the sub-flow path connects to the main flow path in the direction that creates resistance to the flow of liquid in the main flow path.

3. The liquid injection device according to claim 2, wherein: The sub-flow path is connected to the main flow path in a direction perpendicular to the main flow path.

4. A liquid injection device, comprising: The spray head is configured to spray liquid; A container configured to store liquid; as well as A storage container configured to supply liquid to the nozzle and store liquid supplied from the container; The reservoir includes: a first liquid chamber configured to store liquid; a second liquid chamber configured to store liquid and disposed downstream of the first liquid chamber, the downstream side being closer to the nozzle; and a first connecting flow path and a second connecting flow path, the first connecting flow path and the second connecting flow path enabling the first liquid chamber and the second liquid chamber to communicate with each other. Wherein, in the operating posture of the liquid injection device, the connection port between the first liquid chamber and the second connecting flow path is positioned lower than the connection port between the first liquid chamber and the first connecting flow path; and The second connecting flow path has two or more continuous variations, in which the cross-sectional area of ​​the flow path expands and contracts.

5. The liquid injection device according to claim 1 or 2, wherein: The second connected flow path includes a Tesla valve.

6. The liquid injection device according to claim 4, wherein: The second connected flow path includes multiple expansion sections in which the cross-sectional area of ​​the flow path is increased.

7. The liquid injection device according to claim 4, wherein: The second connected flow path includes structures for impeding the flow of liquid.

8. The liquid injection device according to any one of claims 1 to 4, wherein: The second connecting flow path extends along a first orthogonal direction orthogonal to the liquid injection direction.

9. The liquid injection device according to claim 8, wherein: The second liquid chamber and the second connecting flow path are arranged side by side along a second orthogonal direction that is orthogonal to the first orthogonal direction and orthogonal to the liquid jet direction.

10. The liquid injection device according to any one of claims 1 to 4, wherein: The storage device also includes: A box-shaped component, the box-shaped component having a cuboid space; and A component arranged in the cuboid space of the box-shaped component, the component dividing the cuboid space into a first liquid chamber, a second liquid chamber, a first connecting flow path, and a second connecting flow path.

11. The liquid injection device according to any one of claims 1 to 4, wherein: The container includes a replenishment port through which it can be directly replenished with liquid.

12. The liquid injection device according to any one of claims 1 to 4, further comprising: A supply path configured to supply liquid from the container to the nozzle.

13. The liquid injection device according to claim 12, wherein: The supply path includes pipes.

14. The liquid injection device according to any one of claims 1 to 4, wherein: The storage device is configured to move together with the injection head in a predetermined direction.

15. The liquid injection device according to any one of claims 1 to 4, further comprising: Pump, The reservoir is filled with liquid by the pump performing a suction operation on the nozzle.

16. A reservoir disposed in a supply path for supplying liquid stored in a container to a nozzle configured to spray liquid, the reservoir being configured to store liquid, the reservoir comprising: A first liquid chamber, the first liquid chamber being configured to store liquid; A second liquid chamber is configured to store liquid and is located downstream of the first liquid chamber, the downstream side being closer to the injection head; as well as A first connecting flow path and a second connecting flow path, wherein the first connecting flow path and the second connecting flow path enable communication between the first liquid chamber and the second liquid chamber. Specifically, in the operating posture of the injection head, the connection port between the first liquid chamber and the second connecting flow path is positioned lower than the connection port between the first liquid chamber and the first connecting flow path. The second connected flow path is configured such that when the flow rate of the liquid flowing inside the second connected flow path increases, the rate of increase in pressure loss increases.

17. A method for inkjet recording using a liquid jetting apparatus according to any one of claims 1 to 4, the method comprising: The first liquid chamber is filled with liquid by drawing liquid from the outside of the nozzle; as well as Liquid is ejected from the nozzle. Wherein, the flow rate of the liquid in the second connected flow path during filling is greater than the flow rate of the liquid in the second connected flow path during spraying.

18. The method of claim 17, wherein: The ratio of the pressure loss in the second connected flow path during filling to the pressure loss in the second connected flow path during injection is more than eight times.

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