inkjet head

Abstract

An inkjet head has: a plurality of nozzles that eject ink to the outside; a first ink chamber that is supplied with ink; a plurality of first flow path portions that connect the first ink chamber with the nozzles and supply the ink to flow; a pressure variation portion that generates a pressure variation of the ink in the first flow path portions to cause the ink to be ejected from the nozzles; a first damper portion that is disposed in the first ink chamber and suppresses a pressure variation of the ink in the first ink chamber that is transmitted due to the pressure variation of the ink in the first flow path portions; and a first plate member that is disposed between connection portions of the plurality of first flow path portions in the first ink chamber in a manner that a plate face intersects a straight line that links the connection portions of the plurality of first flow path portions. Thus, in the inkjet head having the plurality of nozzles, an influence on ejection of the ink in other nozzles in a case where the ink is ejected from the nozzles is suppressed.

Description

Technical Field

[0001] This invention relates to inkjet heads. Background Technology

[0002] As an example of prior art for inkjet heads, the inkjet head shown in Patent Document 1 is disclosed. The inkjet head of Patent Document 1 is as follows: Figure 6 As shown, the device includes an ink chamber for receiving ink, a pressure chamber connected to the ink chamber via a connecting hole, and nozzles connected to the pressure chamber. Multiple nozzles are formed. Multiple pressure chambers are formed, each corresponding to one of the multiple nozzles. Each of the multiple pressure chambers is connected to one ink chamber. That is, the multiple nozzles and multiple pressure chambers are interconnected via the ink chamber.

[0003] A piezoelectric element is disposed on the upper side wall of the pressure chamber. By applying a voltage to the piezoelectric element, the upper side wall of the pressure chamber deforms, and the pressure inside the pressure chamber changes. Ink is ejected from the nozzle by this pressure change.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent No. 4274084 Summary of the Invention

[0007] An inkjet head according to one aspect of the present invention comprises: a plurality of nozzles that eject ink to the outside; a first ink chamber supplied with ink; a plurality of first flow paths that connect the first ink chamber to the nozzles and supply ink flow; a pressure fluctuation section that generates pressure fluctuation of the ink within the first flow paths, thereby causing ink to be ejected from the nozzles; a first damping section disposed in the first ink chamber and suppressing pressure fluctuation of the ink within the first ink chamber caused by the transmission of pressure fluctuation of the ink within the first flow paths; and a first plate member disposed between the connecting portions of the plurality of first flow paths within the first ink chamber in such a manner that the plate surface intersects with the straight line connecting the connecting portions of the plurality of first flow paths to each other. Attached Figure Description

[0008] Figure 1 This is a cross-sectional view showing an outline of the inkjet head according to Embodiment 1 of the present invention.

[0009] Figure 2 It is along Figure 1 The cross-sectional view of the inkjet head obtained by the line II-II shown.

[0010] Figure 3 It is along Figure 2 The cross-sectional view of the inkjet head obtained by the line III-III shown.

[0011] Figure 4 It is along Figure 1The cross-sectional view of the inkjet head obtained by following the IV-IV line shown.

[0012] Figure 5 This is a cross-sectional view showing an outline of the inkjet head according to Embodiment 2 of the present invention.

[0013] Figure 6 It is along Figure 5 The cross-sectional view of the inkjet head obtained by the VI-VI line shown.

[0014] Figure 7 This is a cross-sectional view showing an outline of the inkjet head according to Embodiment 3 of the present invention.

[0015] Figure 8 It is along Figure 7 A cross-sectional view of the inkjet head obtained by following line VIII-VIII as shown.

[0016] Figure 9 This is a cross-sectional view of an inkjet head according to a modified embodiment of the present invention.

[0017] Explanation of reference numerals in the attached figures:

[0018] 1. Inkjet head

[0019] 20 Mexico Supply Department

[0020] 30 First Ink Chamber

[0021] 31 First vibration damping section

[0022] 32 First Plate Components

[0023] 40 First flow department

[0024] 40a First end of the first flow path section (connection part of the first flow path section)

[0025] 41 Pressure Chamber

[0026] 50 nozzles

[0027] 60 Pressure Variation Section

[0028] 62 Piezoelectric elements

[0029] 133 Filter

[0030] 270 Second Flow Section

[0031] 270a First end (inlet section) of the second flow path section

[0032] 280 Second Ink Chamber

[0033] 281 Second Vibration Damping Section

[0034] 282 Second plate component. Detailed Implementation

[0035] As described above, multiple nozzles and multiple pressure chambers are interconnected via ink chambers. Therefore, pressure fluctuations in the ink generated within the pressure chambers for ink to be ejected from the nozzles are transmitted to other pressure chambers and other nozzles via the ink chambers. These pressure fluctuations transmitted to other nozzles affect the ink ejection from those nozzles. To suppress this effect, a damping chamber is provided within the ink chamber to suppress pressure fluctuations in the ink.

[0036] On the other hand, there is a requirement for miniaturization of the inkjet head. If the inkjet head is miniaturized, the ink chamber becomes smaller, which in turn makes the damping chamber smaller. If the damping chamber is smaller, it is not possible to adequately suppress ink pressure fluctuations, thus increasing the impact on the ink ejection from other nozzles when ink is ejected from the nozzle.

[0037] The present invention addresses the aforementioned problems and aims to suppress the impact of ink ejection from other nozzles when ink is ejected from one nozzle in an inkjet head having multiple nozzles.

[0038] Hereinafter, the inkjet head 1 according to an embodiment of the present invention will be described with reference to the accompanying drawings. It should be noted that, below, Figure 1 The upper and lower sides are respectively set above and below the inkjet head 1, and similarly... Figure 1 The left and right sides are respectively set as the front and rear of inkjet head 1, and similarly... Figure 1 The front side of the paper and the depth side of the paper are respectively set to the left and right sides of the inkjet head 1, for the purpose of explanation.

[0039] (Implementation Method 1)

[0040] like Figures 1-4 As shown, the inkjet head 1 includes a main body 10, an ink supply unit 20, a first ink chamber 30, multiple first flow paths 40, multiple nozzles 50, and a pressure regulating unit 60.

[0041] The main body 10 is formed in the shape of a cuboid. The main body 10 includes a first main body 11, a second main body 12, a vibrating plate member 13, and a nozzle plate member 14.

[0042] The first main body 11 is formed in the shape of a cuboid and constitutes the upper side of the main body 10. The first main body 11 is formed, for example, by machining alloy steel such as stainless steel.

[0043] The second main body 12 is formed in the shape of a cuboid and constitutes the lower side of the main body 10. The second main body 12 is formed, for example, by laminating stainless steel sheet components formed by etching and stamping.

[0044] The vibrating plate member 13 is disposed between the first main body 11 and the second main body 12 in such a manner that the plate surface is orthogonal to the vertical direction. The vibrating plate member 13 is formed, for example, from a stainless steel plate member in a manner that allows for elastic deformation. In addition, the vibrating plate member 13 has a plurality of protrusions 13a arranged in the left-right direction, the plurality of protrusions 13a protruding upward from the upper surface of the vibrating plate member 13 and extending along the front-back direction.

[0045] The nozzle plate component 14 is disposed on the bottom surface of the second main body 12 in such a manner that the plate surface is orthogonal to the vertical direction. The nozzle plate component 14 is formed, for example, by forming a stainless steel plate component using etching and stamping processes.

[0046] The ink supply section 20 is a flow path that supplies ink stored in an ink can (not shown) to the first ink chamber 30. The ink supply section 20 is formed along the vertical direction on the rear side of the main body 10.

[0047] The first ink chamber 30 is formed in the lower rear part of the main body 10 as a cuboid extending in the left-right direction. The first ink chamber 30 stores the ink supplied from the ink supply unit 20 and supplies it to the first flow path unit 40.

[0048] A first flow path 40 is formed in the second main body 12. The first flow path 40 is a flow path that supplies ink from the first ink chamber 30 to the nozzle 50. Multiple first flow path sections 40 are formed in such a way that they correspond to multiple nozzles 50.

[0049] The first end 40a (right end) of the first flow path section 40 is arranged in the first ink chamber 30 in a manner that runs along the left and right direction. Figure 2 The first end 40a of the first flow path section 40 is an example of a "connection section". The left-right direction is an example of a "prescribed direction". The first flow path section 40 includes a pressure chamber 41 and a silo section 42.

[0050] The pressure chamber 41 is formed in the second main body 12 as a cuboid extending in the front-rear direction. The upper side wall of the pressure chamber 41 is formed by the vibrating plate member 13. A protrusion 13a is formed in the vibrating plate member 13 at the part that forms the upper side wall of the pressure chamber 41.

[0051] The silo section 42 connects the pressure chamber 41 to the nozzle 50 and stores ink. The silo section 42 is formed as a cylinder extending in the vertical direction.

[0052] The nozzle 50 ejects ink to the outside. Multiple nozzles 50 are formed. The nozzle 50 is configured to pass through the nozzle plate member 14. The diameter of the nozzle 50 is approximately 3–100 μm.

[0053] The pressure fluctuation unit 60 is disposed on the first main body 11 and generates pressure fluctuations in the ink within the pressure chamber 41. These pressure fluctuations are transmitted toward the nozzle 50, causing ink to be ejected from the nozzle 50. The pressure fluctuation unit 60 includes a base 61, a piezoelectric element 62, a substrate 63, and a control unit (not shown).

[0054] The base portion 61 is formed into a cuboid shape extending in the left-right direction, and holds the piezoelectric element 62 and the substrate portion 63.

[0055] Multiple piezoelectric elements 62 are disposed on the bottom surface of the base portion 61. Each piezoelectric element 62 is configured to contact a protrusion 13a of the vibrating plate member 13 constituting the upper sidewall of the pressure chamber 41. The piezoelectric elements 62 deform by elongating in the vertical direction when a voltage is applied. Specifically, the piezoelectric element 62 is a stacked piezoelectric actuator of the D33 mode.

[0056] The substrate 63 applies a voltage to the piezoelectric element 62. The substrate 63 is, for example, a flexible printed circuit board. The control unit controls the voltage applied to the piezoelectric element 62.

[0057] The piezoelectric element 62, to which voltage is applied by the substrate portion 63, deforms by elongating in the vertical direction, pressing the protrusion 13a downwards. This causes deformation of the upper sidewall of the pressure chamber 41, resulting in a pressure fluctuation that increases the ink pressure within the pressure chamber 41. This pressure fluctuation is transmitted via the silo portion 42 to the nozzle 50, thereby ejecting ink from the nozzle 50 to the outside. Thus, the control unit controls the ink ejection by controlling the voltage applied to the piezoelectric element 62.

[0058] In addition, the first ink chamber 30 includes a first vibration damping part 31 and a first plate member 32.

[0059] The first damping section 31 suppresses pressure fluctuations in the ink within the first ink chamber 30. The first damping section 31 is formed as a plate that elastically deforms in response to pressure fluctuations in the ink within the first ink chamber 30, located below the first end 40a of the first flow path section 40. The thickness of the first damping section 31 is approximately 2–30 μm. The first damping section 31 is formed from the bottom wall of the first ink chamber 30. Pressure fluctuations within the first ink chamber 30 are generated by the transmission of pressure fluctuations in the ink within the pressure chamber 41.

[0060] First plate members 32 are arranged between the first ends 40a of a plurality of first flow path portions 40 in the first ink chamber 30, with their plate surfaces intersecting the straight lines connecting the first ends 40a of the plurality of first flow path portions 40 to each other. Multiple first plate members 32 are arranged within the first ink chamber 30 in a manner corresponding to the plurality of first flow path portions 40. Specifically, the first plate members 32 are arranged within the first ink chamber 30 between the first ends 40a of adjacent first flow path portions 40. Thus, multiple first plate members 32 are arranged in a manner oriented along the left-right direction. The first plate members 32 are formed with the same shape and are arranged at the same height in the vertical direction as the first ends 40a of the first flow path portions 40, with their plate surfaces orthogonal to the left-right direction.

[0061] Furthermore, the first plate member 32 is configured to protrude rearward from between the first ends 40a of adjacent first flow path portions 40 in the front side of the first ink chamber 30, and extend until it contacts the rear side of the first ink chamber 30. Moreover, the first plate member 32 is disposed separately from the first damping portion 31. The first plate member 32 is also disposed separately from the upper side of the first ink chamber 30. By forming the first plate member 32 in this way, the plane including the plate surface of the first plate member 32 intersects the plane including the plate surface of the first damping portion 31.

[0062] The first plate member 32 is formed of the same material as the second main body 12. In addition, the area of ​​the plate surface of the first plate member 32 is approximately 20% to 80% of the cross-sectional area of ​​the first ink chamber 30 obtained by cutting with a plane orthogonal to the left and right directions.

[0063] Next, the operation of the first plate component 32 of the inkjet head 1 will be explained.

[0064] When a voltage is applied to the piezoelectric element 62, a pressure fluctuation of ink is generated in the pressure chamber 41 as described above. This pressure fluctuation of ink is transmitted to the first ink chamber 30 via the first flow path 40. The pressure fluctuation of ink transmitted to the first ink chamber 30 is suppressed by the first damping section 31.

[0065] Furthermore, within the first ink chamber 30, pressure variations in the ink from the first end 40a of the first flow path 40 to the first end 40a of an adjacent first flow path 40 are not directly transmitted due to the presence of the first plate member 32. Specifically, the transmission direction of the ink pressure variations varies along the surface of the first plate member 32. Therefore, pressure variations in the ink from the first end 40a of the first flow path 40 to the first end 40a of an adjacent first flow path 40 are transmitted around the first plate member 32, thus being attenuated compared to the case where the first plate member 32 is not present.

[0066] Furthermore, the pressure fluctuation of the ink, caused by the downward change in the transmission direction due to the first plate member 32, is suppressed by the deformation of the first damping part 31. In this way, the first plate member 32 suppresses the pressure fluctuation of the ink transmitted in the first ink chamber 30 to the adjacent first flow path parts 40.

[0067] According to this embodiment, the inkjet head 1 includes: a plurality of nozzles 50 that eject ink to the outside; a first ink chamber 30 that is supplied with ink; a plurality of first flow path sections 40 that connect the first ink chamber 30 to the nozzles 50 and supply ink flow; a pressure fluctuation section 60 that generates pressure fluctuation of the ink in the first flow path section 40, causing ink to be ejected from the nozzles 50; a first damping section 31 disposed in the first ink chamber 30 and suppressing pressure fluctuation of the ink in the first ink chamber 30 caused by the transmission of pressure fluctuation of the ink in the first flow path section 40; and a first plate member 32 disposed between the first ends 40a of the plurality of first flow path sections 40 in the first ink chamber 30 in such a way that the plate surface intersects the straight line connecting the first ends 40a of the plurality of first flow path sections 40 to each other.

[0068] Accordingly, the pressure variation of ink transmitted from the first flow path section 40 to other first flow path sections 40 in the first ink chamber 30 bypasses the first plate member 32, and is thus attenuated compared to the case where the first plate member 32 is not provided. Therefore, in the inkjet head 1 equipped with multiple nozzles 50, the effect on the ejection of ink in other nozzles 50 when ink is ejected from the nozzle 50 can be suppressed.

[0069] In addition, the first plate member 32 is arranged in a manner corresponding to a plurality of first flow path sections 40.

[0070] Accordingly, pressure variations of ink transmitted from the first flow path section 40 to other first flow path sections 40 in the first ink chamber 30 can be reliably suppressed.

[0071] In addition, the first plate member 32 is disposed in the first ink chamber 30 between adjacent first flow path sections 40.

[0072] Accordingly, pressure variations of ink transmitted from the first flow path section 40 to other first flow path sections 40 in the first ink chamber 30 can be suppressed more reliably.

[0073] Furthermore, in the first ink chamber 30, the first ends 40a of a plurality of first flow path sections 40 are arranged in a manner that runs along the left-right direction. The plane including the plate surface of the first plate member 32 is orthogonal to the left-right direction.

[0074] Accordingly, the first plate member 32 can reliably reduce the transmission of pressure variations of ink in the ink chamber from the first flow path 40 to other first flow path 40.

[0075] Furthermore, the first damping part 31 is formed as a plate that elastically deforms according to the pressure change of the ink, and is arranged such that a plane including the plate surface of the first damping part 31 intersects with a plane including the plate surface of the first plate member 32.

[0076] Accordingly, the first damping part 31 can suppress the pressure fluctuation of ink after the transmission direction changes due to the first plate member 32.

[0077] In addition, the first plate member 32 is disposed separately from the first vibration damping part 31.

[0078] Accordingly, the first damping unit 31 can effectively suppress ink pressure fluctuations.

[0079] In addition, the pressure variation unit 60 is constructed using a stacked piezoelectric actuator of the D33 mode.

[0080] Accordingly, the pressure regulating unit 60 can generate ink pressure variations with high precision. Furthermore, compared to other piezoelectric actuators, the D33-mode stacked piezoelectric actuator has a smaller thickness and generates larger pressure variations. Therefore, miniaturization of the inkjet head 1 can be achieved, and ejection performance can be improved. In this embodiment, since the first plate member 32 suppresses pressure variations, the D33-mode stacked piezoelectric actuator can be applied to the pressure regulating unit 60.

[0081] (Implementation Method 2)

[0082] Next, use Figure 5 and Figure 6 The inkjet head 1 according to Embodiment 2 of the present invention will be described. Compared with Embodiment 1 described above, the inkjet head 1 of Embodiment 2 includes a filter 133.

[0083] Filter 133 is a plate-shaped component with multiple nozzles 50 having holes of less than the diameter. Filter 133 is made of stainless steel and non-woven fabric formed into a mesh.

[0084] The filter 133 is disposed within the first ink chamber 30, facing the first vibration damping part 31 with respect to the first plate member 32. The filter 133 is disposed within the first ink chamber 30 between the ink supply part 20 and the first plate member 32, separated from the first plate member 32, with its surface orthogonal to the vertical direction. The filter 133 captures foreign matter contained in the ink supplied from the ink supply part 20.

[0085] The filter 133 has a thickness of 2 to 30 μm and is flexible. Therefore, pressure fluctuations in the ink caused by the upward change in the transmission direction due to the first plate member 32 are suppressed by the flexure of the filter 133.

[0086] According to this embodiment, the inkjet head 1 further includes a filter 133, which is disposed in the first ink chamber 30 opposite to the first damping part 31 through the first plate member 32, and is flexible.

[0087] Accordingly, filter 133 can suppress pressure fluctuations of ink in the first ink chamber 30.

[0088] In addition, the first plate component 32 is configured separately from the filter 133.

[0089] Accordingly, filter 133 can effectively suppress ink pressure fluctuations.

[0090] (Implementation Method 3)

[0091] Next, use Figure 7 and Figure 8 The inkjet head 1 of Embodiment 3 of the present invention will be described. Compared with Embodiment 1 described above, the inkjet head 1 of Embodiment 2 includes a second flow path section 270, a second ink chamber 280, and an ink discharge section 290.

[0092] A second flow path section 270 is formed in the second main body section 12. The second flow path section 270 connects the pressure chamber 41 of the first flow path section 40 to the second ink chamber 280 and guides the ink in the pressure chamber 41 to the second ink chamber 280. Multiple second flow path sections 270 are formed in such a way that they correspond to the pressure chambers 41 of the multiple first flow path sections 40. The first end 270a (left end) of the second flow path section 270 is arranged in the second ink chamber 280 in a left-right direction. Figure 8 The first end 270a of the second flow path section 270 is an example of an "introduction section".

[0093] The second ink chamber 280 is formed in the same shape as the first ink chamber 30 on the lower part of the front side of the main body 10. The second ink chamber 280 discharges the ink supplied from the second flow path section 270 to the ink discharge section 290.

[0094] The ink discharge section 290 is a flow path through which ink discharged from the second ink chamber 280 is discharged to an ink tank (not shown). As described above, the ink stored in the ink tank is supplied from the ink supply section 20 to the first ink chamber 30. That is, in Embodiment 3, the ink circulates in the following order: ink tank, ink supply section 20, first ink chamber 30, pressure chamber 41 of the first flow path section 40, second flow path section 270, second ink chamber 280, and ink discharge section 290.

[0095] The second ink chamber 280 includes a second vibration damping part 281 and a second plate component 282.

[0096] The second damping section 281 suppresses pressure fluctuations in the ink within the second ink chamber 280. The second damping section 281 is formed similarly to the first damping section 31 at a location lower than the first end 270a of the second flow path section 270. Pressure fluctuations within the second ink chamber 280 are caused by the transmission of pressure fluctuations in the ink within the pressure chamber 41 of the first flow path section 40.

[0097] The second plate members 282 are arranged between the first ends 270a of the second flow path sections 270 in which ink is introduced within the second ink chamber 280, with their plate surfaces intersecting the straight lines connecting the first ends 270a of the second flow path sections 270 to each other. Multiple second plate members 282 are arranged corresponding to the pressure chambers 41 of the multiple first flow path sections 40. Specifically, the second plate members 282 are arranged within the second ink chamber 280 between the first ends 270a of adjacent second flow path sections 270. The second plate members 282 are arranged at the same height in the vertical direction as the first ends 270a of the second flow path sections 270, with their plate surfaces orthogonal to the horizontal direction.

[0098] Furthermore, the second plate member 282 is configured to protrude forward from between the first ends 270a of adjacent second flow path portions 270 in the rear side of the second ink chamber 280, and extend until it contacts the front side of the second ink chamber 280. Moreover, the second plate member 282 is disposed separately from the second damping portion 281. The second plate member 282 is also disposed separately from the upper side of the second ink chamber 280. By forming the second plate member 282 in this way, the plane including the plate surface of the second plate member 282 intersects the plane including the plate surface of the second damping portion 281.

[0099] The second plate member 282 is formed of the same material as the second main body 12. The area of ​​the plate surface of the second plate member 282 is approximately 20% to 80% of the cross-sectional area of ​​the second ink chamber 280 obtained by cutting with a plane orthogonal to the left and right directions.

[0100] In the inkjet head 1 configured in this way in Embodiment 3, similarly to the first plate member 32 described above, the pressure fluctuation of ink transmitted from the second flow path section 270 to other second flow path sections 270 in the second ink chamber 280 bypasses the second plate member 282. Therefore, the second plate member 282 suppresses the pressure fluctuation of ink transmitted from the second ink chamber 280 to adjacent second flow path sections 270.

[0101] According to this embodiment, the inkjet head 1 includes: a second ink chamber 280 through which ink is introduced from a plurality of first flow path portions 40; a second damping portion 281 disposed in the second ink chamber 280 and suppressing pressure fluctuations in the ink within the second ink chamber 280 caused by the transmission of pressure fluctuations in the ink within the first flow path portions 40; and a second plate member 282 disposed between the first ends 270a of the second flow path portions 270 through which ink is introduced in the second ink chamber 280 in such a manner that the plate surface intersects with a straight line connecting the first ends 270a of the second flow path portions 270 to each other.

[0102] Accordingly, the pressure variation of ink transmitted from the second flow path 270 to other second flow path 270 in the second ink chamber 280 bypasses the second plate member 282, and is thus attenuated compared to the case where the second plate member 282 is not provided. Therefore, in the inkjet head 1 equipped with multiple nozzles 50, the effect on the ejection of ink in other nozzles 50 when ink is ejected from the nozzle 50 can be suppressed.

[0103] (Modified Example)

[0104] The preferred embodiments have been described in detail above, but are not limited to the above-described embodiments. Various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the technical solution.

[0105] For example, materials other than those used in the main body 10 (such as ceramics) may be used to form the first plate member 32 and the second plate member 282.

[0106] Alternatively, the first plate member 32 can be made to contact the first damping part 31. Furthermore, the second plate member 282 can be made to contact the second damping part 281.

[0107] Alternatively, the first plate member 32 and the second plate member 282 can be arranged at an angle so that each plate surface is not orthogonal to the left and right directions but crosses each other.

[0108] Alternatively, the first plate member 32 can be configured not to contact the side wall of the first ink chamber 30. Furthermore, the second plate member 282 can also be configured not to contact the side wall of the second ink chamber 280.

[0109] Alternatively, the first damping part 31 can be disposed on other side walls (e.g., the rear side wall) of the first ink chamber 30. Furthermore, the second damping part 281 can be disposed on other side walls (e.g., the front side wall) of the second ink chamber 280.

[0110] Alternatively, the first plate member 32 can be configured to contact the filter 133.

[0111] Furthermore, in the above embodiment, the first plate member 32 is arranged with the same height in the vertical direction, but this can be substituted, as shown below. Figure 9 The first plate members 332 shown are arranged in a manner with different vertical positions. Specifically, the first plate members 332 are arranged in a left-right direction with different vertical positions. This further suppresses pressure fluctuations transmitted in the left-right direction within the first ink chamber 30. Furthermore, the sizes and shapes of the adjacent first plate members 332 can also be different. It should be noted that the second plate member 282 can also be arranged in a manner with different vertical positions and sizes.

[0112] According to the inkjet head of the present invention, in an inkjet head having multiple nozzles, it is possible to suppress the effect on the ejection of ink in other nozzles when ink is ejected from one nozzle.

[0113] [Industrial Applicability]

[0114] This invention can be widely used in inkjet heads.

Claims

1. An inkjet head, wherein, The inkjet head has the following features: Multiple nozzles that eject ink outwards; The first ink chamber, which is supplied with the ink; Multiple first flow paths connect the first ink chamber to the nozzle and supply ink flow; The pressure variation unit generates pressure variation of the ink within the first flow path section, causing the ink to be ejected from the nozzle; A first damping unit is disposed in the first ink chamber and suppresses pressure fluctuations in the ink within the first ink chamber caused by the transmission of pressure fluctuations in the ink within the first flow path; and The first plate component is arranged such that its plate surface intersects the straight lines connecting the multiple first flow path sections within the first ink chamber. The first plate component is disposed separately from the inner wall of the first ink chamber on the side opposite to the side where the first damping part is located.

2. An inkjet head, wherein, The inkjet head has the following features: Multiple nozzles that eject ink outwards; The first ink chamber, which is supplied with the ink; Multiple first flow paths connect the first ink chamber to the nozzle and supply ink flow; The pressure variation unit generates pressure variation of the ink within the first flow path section, causing the ink to be ejected from the nozzle; A first damping unit is disposed in the first ink chamber and suppresses pressure fluctuations in the ink within the first ink chamber caused by the transmission of pressure fluctuations in the ink within the first flow path; and The first plate component is arranged such that its plate surface intersects the straight lines connecting the multiple first flow path sections within the first ink chamber. In the first ink chamber, the connecting portions of the plurality of first flow path sections are arranged in a manner that follows a predetermined direction. The first plate components are arranged in a plurality of arrangements along the specified direction. The first plate members that are adjacent to each other are arranged in a manner that differs in position in a direction orthogonal to the specified direction.

3. An inkjet head, wherein, The inkjet head has the following features: Multiple nozzles that eject ink outwards; The first ink chamber, which is supplied with the ink; Multiple first flow paths connect the first ink chamber to the nozzle and supply ink flow; The pressure variation unit generates pressure variation of the ink within the first flow path section, causing the ink to be ejected from the nozzle; A first damping unit is disposed in the first ink chamber and suppresses pressure fluctuations in the ink within the first ink chamber caused by the transmission of pressure fluctuations in the ink within the first flow path; and The first plate component is arranged such that its plate surface intersects the straight lines connecting the multiple first flow path sections within the first ink chamber. The first plate component and the first vibration damping part are configured off the ground.

4. An inkjet head, wherein, The inkjet head has the following features: Multiple nozzles that eject ink outwards; The first ink chamber, which is supplied with the ink; Multiple first flow paths connect the first ink chamber to the nozzle and supply ink flow; The pressure variation unit generates pressure variation of the ink within the first flow path section, causing the ink to be ejected from the nozzle; A first damping unit is disposed in the first ink chamber and suppresses pressure fluctuations in the ink within the first ink chamber caused by the transmission of pressure fluctuations in the ink within the first flow path; and The first plate component is arranged such that its plate surface intersects the straight lines connecting the multiple first flow path sections within the first ink chamber. The inkjet head also includes a filter, which is disposed in the first ink chamber opposite to the first vibration damping part through the first plate member, and is flexible.

5. The inkjet head according to claim 4, wherein, The first plate component is configured separately from the filter.

6. An inkjet head, wherein, The inkjet head has the following features: Multiple nozzles that eject ink outwards; The first ink chamber, which is supplied with the ink; Multiple first flow paths connect the first ink chamber to the nozzle and supply ink flow; The pressure variation unit generates pressure variation of the ink within the first flow path section, causing the ink to be ejected from the nozzle; A first damping unit is disposed in the first ink chamber and suppresses pressure fluctuations in the ink within the first ink chamber caused by the transmission of pressure fluctuations in the ink within the first flow path; and The first plate component is arranged such that its plate surface intersects the straight lines connecting the multiple first flow path sections within the first ink chamber. The inkjet head has the following features: The second ink chamber is through which the ink is introduced from a plurality of the first flow paths; The second damping part is disposed in the second ink chamber and suppresses the pressure fluctuation of the ink in the second ink chamber caused by the transmission of the pressure fluctuation of the ink in the first flow path part. as well as The second plate component is arranged in the second ink chamber among a plurality of ink-introducing portions, with the plate surface intersecting the straight lines connecting the plurality of ink-introducing portions.

7. The inkjet head according to any one of claims 1 to 6, wherein, The first plate component is configured to protrude from the connection between the first flow path portions and extend in the direction of protrusion until it contacts the inner wall surface of the first ink chamber.

8. The inkjet head according to any one of claims 1 to 6, wherein, The first plate component is configured in a manner corresponding to a plurality of the first flow path sections.

9. The inkjet head according to any one of claims 1 to 6, wherein, In the first ink chamber, the connecting portions of the plurality of first flow path sections are arranged in a manner that follows a predetermined direction. The plane including the surface of the first plate component is orthogonal to the specified direction.

10. The inkjet head according to any one of claims 1 to 6, wherein, The first plate component is disposed in the first ink chamber between adjacent first flow path sections.

11. The inkjet head according to any one of claims 1 to 6, wherein, The first damping part is formed as a plate that elastically deforms according to the pressure change of the ink, and is arranged such that a plane including the plate surface of the first damping part intersects with a plane including the plate surface of the first plate member.

12. The inkjet head according to any one of claims 1 to 6, wherein, The pressure variation unit is constructed using a stacked piezoelectric actuator of the D33 mode.

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