JP3671589B2 - Inkjet head - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to an ink jet head provided in an ink jet recording apparatus, and more particularly to an improvement in the form of an ink flow path provided in the ink jet head.
[0002]
[Background]
  As a recording apparatus having a relatively simple configuration and easy high-speed printing and high-quality printing, there is an ink jet recording apparatus. An ink jet recording apparatus that is of interest to the present invention will be described with reference to FIGS. 1 to 6 are also referred to for explaining the embodiment of the present invention.
[0003]
  FIG. 1 is a perspective view showing an outline of the entire inkjet recording apparatus 1. A printing mechanism 2 and a purge device 3 are incorporated in the ink jet recording apparatus 1. The main part of the printing mechanism 2 is enlarged and shown in FIG.
  As shown in FIG. 2, the printing mechanism 2 includes an inkjet head 4 (not shown in FIG. 1) and an ink cartridge 5 that is detachably attached to the inkjet head 4 to supply ink to the inkjet head 4. Yes.
[0004]
  In the ink jet recording apparatus 1, as shown by “5a”, “5b”, “5c”, and “5d” in FIG. 1, inks of cyan, magenta, yellow, and black are supplied to achieve colorization. Therefore, four ink cartridges 5 are mounted, and accordingly, four inkjet heads 4 are provided corresponding to the four ink cartridges 5.
[0005]
  FIG. 3 shows a single inkjet head 4 in a perspective view. 3 is a sectional view taken along line IV-IV in FIG. 3, and FIG. 5 is a sectional view taken along line VV.
  The ink-jet head 4 includes an actuator 7 in which a plurality of channels 6 for containing ink are formed in an aligned state, and a manifold 8 for supplying ink from the ink cartridge 5 to each channel 6.
[0006]
  In the actuator 7, for example, a desired volume in the channel 6 is changed by utilizing deformation when an electric field is applied to the piezoelectric ceramic. When the volume is decreased, the ink in the channel 6 is ejected as droplets from the nozzle 9, The ink from the ink cartridge 5 and the manifold 8 is introduced into the channel 6 when the volume is increased. The nozzle 9 is provided with a pore 10 communicating with the outlet end of each channel 6.
[0007]
  Preferably, a dummy groove 11 is formed in the actuator 7 so as to extend in parallel with the channel 6 so as to sandwich each channel 6. The dummy groove 11 is for making the volume change of each channel 6 more easily caused by the deformation of the piezoelectric ceramic described above, and is closed on the manifold 8 side so that ink is not introduced therein.
[0008]
  As shown in FIGS. 4 and 5, the actuator 7 includes two substrates 12 and 13 for forming the channel 6 and the dummy groove 11 as described above, and a center plate 14 sandwiched between the substrates 12 and 13, respectively. Consists of. Therefore, in the actuator 7, the plurality of channels 6 are arranged in an aligned state while forming two rows.
[0009]
  The manifold 8 is joined to the actuator 7 on the inlet end side of the channel 6. The manifold 8 is provided with a supply path 16 that extends in the alignment direction of the plurality of channels 6 and opens in common to the inlet ends of the channels 6. As shown in FIGS. 5 and 6, the supply path 16 is formed along each row of the channels 6. As shown in FIG. 6, the two rows of supply paths 16 are integrated with each other at the top and communicated with an inlet 21 connected to the ink cartridge 5. In addition, the structure employ | adopted in embodiment of this invention is also included in a part of FIG.
[0010]
  As shown in FIG. 2, the manifold 8 has mounting pieces 17 and 18 formed at both ends thereof, and is positioned while the actuator 7 is sandwiched between the mounting pieces 17 and 18. By applying an adhesive (not shown), the actuator 7 and the manifold 8 are fixed in a liquid-tight manner. The inkjet head 4 including the integrated actuator 7 and manifold 8 is housed in a head cover 19 and is held by the carriage 20 shown in FIG.
[0011]
  As shown in FIG. 2, the inkjet head 4 is disposed with an inclination of about 45 degrees with the nozzle plate 9 down and the manifold 8 up. At this time, the manifold 8 is arranged such that the supply passage 16 continues downward from the introduction port 21 with the introduction port 21 at the top. The ink jet head 4 can be placed horizontally or vertically downward. However, in the case of horizontal orientation, it is desirable that the supply path 16 be disposed below the inlet 21.
[0012]
  Referring again to FIG. 2, the ink cartridge 5 described above is detachably attached to the introduction port 21 of the manifold 8 that communicates with the supply path 16 via a rubber seal member 22 and an adapter 23. A filter 24 is provided at the introduction port 21, while a filter 26 is provided at the discharge port 25 of the ink cartridge 5, and ink is supplied from the ink cartridge 5 to the manifold 8 through these filters 24 and 26. The
[0013]
  As shown in FIG. 1, the carriage 20 is held so as to be linearly reciprocable along a guide shaft 27 and a guide rail 28, and is connected to an endless belt 31 that is stretched over pulleys 29 and 30. Accordingly, when one pulley, for example, the pulley 30 is rotationally driven by a motor (not shown), the carriage 20 moves back and forth linearly.
[0014]
  On the other hand, the recording paper 32 indicated by a two-dot chain line in FIG. 1 is fed in the direction of arrow 35 as the platen roller 33 rotates in the direction of arrow 34 based on a paper feed mechanism (not shown).
  In this manner, in the inkjet recording apparatus 1, the movement of the carriage 20 and the movement of the recording paper 32 cooperate to cause the inkjet head 4 to eject ink onto a desired area on the recording paper 32 to perform desired printing. To achieve.
[0015]
  The purge device 3 described above is provided on the side of the platen roller 33 so as to face the position of the inkjet head 4 in the reset state. During use, the ink-jet head 4 may cause non-ejection due to bubbles generated or remaining therein or ink adhering to the ejection surface. When the cap 36 is close to the inkjet head 4 and covers the ejection surface of the inkjet head 4, the purge device 3 generates a negative pressure by the pump 37 and sucks a predetermined amount of ink inside the inkjet head 4 together with bubbles. Thus, it is sent to the storage unit 38, whereby the above-described inconveniences are solved, and a good jetting state recovery in the inkjet head 4 is achieved.
[0016]
[Problems to be solved by the invention]
  FIG. 11 is an enlarged view of a portion corresponding to the portion VIII in FIG. 6. In the structure previously considered by the present applicant, the joint surface of the actuator 7 included in the inkjet head 4 to the manifold 8 is shown. A part of is shown enlarged.
  Referring to FIG. 11, when the ink cartridge 5 is replaced, the initial introduction of ink into the inkjet head 4 is performed by sucking ink from the ink cartridge 5 to the inkjet head 4 using the purge device 3. At that time, air is also sucked together, and the air tends to remain as bubbles 39a in the vicinity of the final end of the supply path 16 (the end farthest from the inlet 21). In particular, if the inkjet head 4 is left unused, the bubbles 39a grow. Thus, the bubbles 39a remaining in the vicinity of the final end of the supply path 16 are relatively difficult to remove even if purging is performed. As a result, in the channel 6 communicating with the vicinity of the final end of the supply path 16 In many cases, ink is not ejected. As shown in FIG. 11, in the case where the supply path 16 is formed in parallel to the final end, the bubble 39a is generated not only at the position facing the channel 6 but also at a shifted position, and is removed by suction by the purge device 3. It becomes very difficult to do.
[0017]
  Accordingly, an object of the present invention is to provide an ink jet head that can solve the above-described problems.
[0018]
[Means for Solving the Problems]
  In the present invention, a plurality of channels containing ink are formed in an aligned state, and an actuator that drives the ink in these channels to be ejected as droplets from a nozzle is joined to the actuator on the inlet end side of the channel. A plurality of manifolds each having a supply passage extending in an alignment direction of the plurality of channels and having a common opening with respect to the inlet ends of the channels. In order to solve the above-described technical problem, the invention according to claim 1 is directed to an inkjet head.The width in the direction along the center line of the channel is narrowed toward the final end, and the width in the direction perpendicular to the center line of the channel and the alignment direction is toward the final end.It is characterized by being narrowed.
[0019]
  Thus, at the end of the supply pathThe width in the direction along the center line of the channel is narrowed toward the final end, and the width in the direction perpendicular to the center line of the channel and the alignment direction is toward the final end.When narrowed, the air bubbles remaining there can be brought in a position very close to the inlet end of any channel near the final end.
[0020]
  The invention according to claim 2 is the invention according to claim 1, wherein the center line of the channel is shifted from the position through which the center line passes.Furthest away from the opening for each inlet end of the channelIt is characterized by positioning the deepest part.
  Such a characteristic configuration relating to the position of the deepest part of the supply path is that the cross-sectional area of the supply path is kept substantially the same as compared with the case where the deepest part is located at the position where the center line of the channel passes, or not much. Without increasing the size, the distance between the deepest part and the inlet end of the channel is increased so that the outer surface of the bubble reaches the inlet end of the channel even if the bubble located at the deepest part grows at the same speed However, when this characteristic configuration is adopted, the bubbles remaining in the deepest part are undesirably moved away from the inlet end of the channel, as a result. The removal of bubbles by purging becomes more difficult. Therefore, when the characteristic configuration described in claim 2 is adopted, as described in claim 1, at the end of the supply path,The width in the direction along the center line of the channel is narrowed toward the final end, and the width in the direction perpendicular to the center line of the channel and the alignment direction is toward the final end.It is particularly advantageous to make it narrow, so that the bubbles located at this end can be brought closer to the inlet end of the channel, so that they can be easily removed by purging.
[0021]
  According to a third aspect of the present invention, in the invention of the second aspect, the deepest portion at the end of the supply path extends so as to approach the position where the center line of the channel passes as it goes to the final end of the supply path. It is characterized by having.
  Thus, when the above-mentioned form is given to the deepest part in the terminal part of the supply path, since the bubbles remaining in the terminal part of the supply path tend to be located in the deepest part, it is located in this deepest part. It is easier to remove the bubbles by purging.
[0022]
  The invention according to claim 4The width of the end of the feed channel is narrowed as it goes to its final end, and the feed channel is the deepest farthest away from the opening for each inlet end of the channel, at a position offset from the position through which the channel centerline passes. At the end of the supply path Is characterized in that the deepest part has a form extending closer to the position through which the center line of the channel passes as it goes to the final end of the supply path.
[0023]
Thus, when the above-mentioned form is given to the deepest part in the terminal part of the supply path, since the bubbles remaining in the terminal part of the supply path tend to be located in the deepest part, it is located in this deepest part. It is easier to remove the bubbles by purging.
The invention according to claim 5 is the invention according to any one of claims 2 to 4, characterized in that the deepest portion is located at the uppermost position in the gravity direction in the supply path.
[0024]
According to such a configuration, the bubbles remaining at the end of the supply path tend to be located at the deepest portion, so that it is easier to remove the bubbles located at the deepest portion by purging.
According to a sixth aspect of the present invention, in the invention according to any one of the second to fifth aspects, the supply path includes an inner wall surface that faces the inlet end of the channel and is inclined with respect to the center line of the channel. The part is characterized in that it is the part farthest from the inlet end in the inner wall.
[0025]
According to such a configuration, the bubbles remaining at the end of the supply path tend to be located at the deepest portion, so that it is easier to remove the bubbles located at the deepest portion by purging.
  Claim7The invention described in claim 1 to claim 16In the invention described in any one of the above, the plurality of channels are formed in an aligned state in each row while forming a plurality of rows, and the supply path is formed along each row of the plurality of channels. It is said.
[0026]
  As described above, in the inkjet head in which a plurality of channels form a plurality of rows and are formed in an aligned state in each row, when the supply path is formed along each row of the plurality of channels, Since the cross-sectional area cannot be increased so much, it is significant that bubbles can be effectively removed as described in claim 1.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
  As described above, FIGS. 1 to 6 are also for explaining the inkjet head 4 according to the embodiment of the present invention. The general description of the inkjet head 4 will not be repeated here with the aid of the description given above with reference to FIGS. 1 to 6 to clarify the background of the invention.
[0028]
  In this embodiment, first, with respect to the positional relationship between the inlet end of the channel 6 on the actuator 7 side and the supply path 16 on the manifold 8 side, a configuration as shown in FIG. 7 is adopted. FIG. 7 is an enlarged view of the portion VII in FIG. 5 and shows the supply path 16 shown by a solid line in FIG. FIG. 10 is a view corresponding to FIG. 7 showing the structure previously considered by the present applicant, and shows a supply path 16 indicated by an imaginary line in FIG.
[0029]
  Referring to FIG. 7, the supply path 16 on the manifold 8 side has the deepest portion 40 located at a position shifted from the position through which the center line 41 of the channel 6 on the actuator 7 side passes. In particular, in this embodiment, the deepest portion 40 is shifted to a position that does not face the inlet end of the channel 6. That is, the inner wall of the supply path 16 that faces the inlet end of the channel 6 is inclined at an acute angle with the center line 41 of the channel 6 and continues to the deepest portion 40. As will be described later, the deepest portion 40 extends in parallel with the row of channels 6 except for the channel 6 farthest from the inlet 21.
[0030]
  Thus, according to this embodiment, as shown in FIG. 10 or as indicated by an imaginary line in FIG. 5, compared with the case where the deepest part is at the position where the center line of the channel 6 passes, The distance between the deepest portion 40 and the inlet end of the channel 6 can be increased while keeping the cross-sectional area substantially the same or not too large. Accordingly, as shown in the broken line and the solid line in FIG. 7, when the bubble 39 located at the deepest portion 40 grows, even if this growth proceeds at the same speed as shown by the imaginary line in FIG. The period until the outer surface reaches the inlet end of the channel 6 can be made longer.
[0031]
  For this reason, the bubble 39 can be prevented from being drawn into the channel 6 for a relatively long period of time, so that a good printing state can be kept long. In addition, the frequency of the required purge can be reduced, the efficiency of the printing operation can be increased, and the burden on the maintenance system including the purge device 3 shown in FIG. 1 can be reduced. Further, since the amount of ink wasted by purging can be reduced, the amount of ink that can be used for original printing can be increased.
[0032]
  The characteristic configuration of the present invention in this embodiment is well illustrated in FIG. FIG. 8 shows a part of the joint surface of the actuator 7 with the manifold 8. In FIG. 8, the area where the manifold 8 is in contact with the actuator 7 is hatched, and the position of the deepest portion 40 of the supply path 16 is indicated by a one-dot chain line.
[0033]
  The characteristic configuration shown in FIG. 8 is for solving the following problems.
  As described above, generally, when ink is initially introduced, bubbles tend to remain near the final end of the supply path, and bubbles remaining near the final end of the supply path are purged even in this way. However, it is relatively difficult to remove, and as a result, ink is often not ejected in the channel communicating with the vicinity of the final end of the supply path.
[0034]
  The above-mentioned tendency is that when the deepest portion 40 of the supply path 16 is wider and flatter than the channel 6 or from the position where the deepest portion 40 of the supply path 16 passes through the center line 41 of the channel 6 as shown in FIG. When it is located at a shifted position, it appears more prominently. This is because, as described above, the bubbles 39 are likely to remain at the deepest portion 40, but in the former case, bubbles may be generated far from the inlet end of the channel 6, and in the latter case, This is because it is surely kept away from the entrance end.
[0035]
  In this embodiment, as shown in FIG. 8, the width of the supply path 16 is made narrower toward the final end at the end portion of the supply path 16, and the deepest portion 40 of the supply path 16 is As it goes to the final end of the supply path 16, it extends so as to be closer to the position through which the center line 41 of the channel 6 passes. Therefore, the shape of the supply path 16 corresponding to the channel 6 near the final end is substantially the same as that in FIG.
[0036]
  FIG. 8 also shows bubbles 39 a remaining near the final end of the supply path 16. The bubble 39a remains at the position of the deepest portion 40 of the supply path 16 as in the case of the bubble 39 shown in FIG. 7, but the width is gradually reduced at the end portion of the supply path 16. The bubble 39a is brought to a position very close to the inlet end of any channel 6 near the final end. In particular, in this embodiment, the deepest portion 40 of the supply path 16 extends closer to the position through which the center line 41 of the channel 6 passes as it goes to the final end of the supply path 16, so that the bubble 39 a is in the deepest portion 40. As a result, the bubble 39a can be brought to a position very close to the inlet end of the channel 6 more reliably.
[0037]
  Therefore, the bubbles 39a remaining in the vicinity of the final end of the supply path 16 as described above can be easily and effectively passed through any one of the channels 6 in the vicinity of the final end if purging is performed at the initial introduction of ink. Can be removed.
  According to the inventor's experiment, as shown in FIGS. 8 and 9, the bubble 39a does not easily reach the final end surface of the supply path 16, but also has a spherical surface as shown in FIG. Since a gap is formed between the flat surface and the plane, an ink flow path is secured for the channel 6 at the final end of the supply path 16 as long as bubbles do not grow significantly. However, as shown in FIG. 9, the growth of the bubbles 39a tends to extend to the upstream side of the supply path 16, and the channel 6 on the front side is often closed before the channel 6 on the final end is closed. For this reason, the air bubbles that cause the blockage can be removed at an early stage by purging the ink when it is initially introduced.
[0038]
  As shown in FIG. 2, the introduction port 21 of the manifold 8 has an inclined surface 21 a at the end on the supply path 16 side so that the cross-sectional area gradually increases toward the supply path 16. This is because when the ink is initially introduced from the ink cartridge 5 to the inkjet head 4, the ink violently collides with the end surface on the manifold side of the inkjet head 4 to generate bubbles. This is to prevent the flow velocity from dropping. As a result, the number of bubbles entering the supply path 16 is reduced as much as possible, and the configuration according to the present embodiment can be made more effective.
[0039]
  In the specific design regarding the form of the terminal portion of the supply path 16 as described above, the wettability of the material constituting the manifold 8, the surface tension of the ink, the final end of the supply path 10 and the inlet end of the endmost channel 6 , The curvature of the inner surface of the terminal portion of the supply path 10, the direction of gravity when the inkjet head 4 is used, the volume of the bubble 39a, the depth of the channel 6, and the like.
[0040]
  While the invention has been described with reference to the illustrated embodiments, other embodiments are possible within the scope of the invention.
  For example, the configuration described with reference to FIG. 7 is not essential, and may not be adopted if an advantage of such a configuration is not expected. Therefore, the present invention is also applicable to the case where the deepest portion 40 in the supply path 16 is located at a position where the center line 41 of the channel 6 passes, as shown in FIG. 10 or indicated by an imaginary line in FIG. Can do.
[0041]
  In the illustrated embodiment, in the actuator 7, the channel 6 has two rows. However, the channel 6 may have three rows or more, or may simply have one row.
  In the above description, the actuator 7 is of a type that ejects ink by utilizing deformation when an electric field is applied to the piezoelectric ceramic. Instead, for example, a heater element is used. Or the like.
[0042]
【The invention's effect】
  As described above, according to the first aspect of the present invention, the end portion of the supply pathThe width in the direction along the center line of the channel is narrowed toward the final end, and the width in the direction perpendicular to the center line of the channel and the alignment direction is toward the final end.Since it is narrowed, bubbles remaining there can be brought to a position very close to the inlet end of any channel near the final end, and therefore if the purge is performed during the initial introduction of the ink The bubbles remaining in the vicinity of the final end can be easily and effectively removed through any channel in the vicinity of the final end. Therefore, after the initial introduction of the ink, for example, when the ink jet head is not used and then left to be used, the final end of the supply path is caused by bubbles remaining in the vicinity of the final end of the supply path. Ink ejection can be prevented from occurring in a channel communicating with the vicinity, and the reliability with respect to the print quality of the ink jet head when ink is initially introduced can be improved.
[0043]
  Next, according to the second aspect of the invention, first, the following effects are exhibited. That is, the supply path in the manifold is shifted from the position where the center line of the channel on the actuator passes.Furthest away from the opening for each inlet end of the channelSince the deepest part is located, the deepest part can be maintained while keeping the cross-sectional area of the supply channel substantially the same or not so large as compared with the case where the deepest part is at the position where the center line of the channel passes. The distance between the inlet end of the channel and the inlet end of the channel can be increased, and therefore the period until the outer surface of the bubble reaches the inlet end of the channel, even though the growth of the deepest bubble proceeds at a similar speed Can be made longer. For this reason, bubbles can be prevented from being drawn into the channel for a relatively long period of time, so that a good printing state can be maintained for a long time. Moreover, the frequency of the required purge can be reduced, and the burden on the maintenance system including the purge device can be reduced. Further, since the amount of ink wasted by purging can be reduced, the amount of ink that can be used for original printing can be increased.
[0044]
  However, as the flip side of the advantageous effects as described above, when only the technical matters described in claim 2 are simply adopted, the bubbles remaining undesirably in the deepest portion in the vicinity of the final end of the supply path. May be moved away from the inlet end of the channel, resulting in more difficult bubble removal by purging. However, since the technical matter described in claim 2 is applied to the invention described in claim 1, as described in claim 1, the width of the end portion of the supply path is gradually reduced. As a result, bubbles located near the final end of the supply path can be brought close to the inlet end of the channel, and these bubbles can be easily removed by purging.
[0045]
  Next, according to the third aspect of the present invention, since the bubbles remaining in the supply path tend to be located at the deepest portion, the deepest portion at the end portion of the supply path goes to the final end of the supply path. By making it closer to the position through which the center line of the channel passes, the bubbles positioned at the deepest portion can be reliably removed by purging.
[0046]
According to the fourth aspect of the present invention, since the bubbles remaining in the supply path tend to be located at the deepest part, the deepest part at the terminal end of the supply path is moved to the final end of the supply path, so that the channel By being closer to the position where the center line passes, the bubbles positioned in the deepest portion can be reliably removed by purging.
The invention according to claim 5 is applied to the invention according to any one of claims 2 to 4, and as described in claim 5, the deepest part is the uppermost part in the gravity direction in the supply path. When located at the position, the bubbles remaining at the end of the supply path tend to be located at the deepest part, so that it is easier to remove the bubbles located at the deepest part by purging.
[0047]
The invention according to claim 6 is applied to the invention according to any one of claims 2 to 5, but the supply path faces the inlet end of the channel as described in claim 6. If the inner wall surface is inclined with respect to the center line of the channel, and the deepest part is the part farthest from the inlet end of the inner wall, the bubbles remaining at the terminal end of the supply path are located at the deepest part. Therefore, it becomes easier to remove the bubbles located at the deepest part by purging.
[0048]
  Claim7The invention described in claim 1 to claim 16Which is applied to the invention according to any one of claims7As described in the above, when a plurality of channels are formed in a plurality of rows in an aligned state in each row, and the supply path is formed along each row of the plurality of channels, the supply path Since the cross-sectional area cannot be increased so much, the purge load can be reduced, but bubbles cannot be retained in each supply passage for a long period of time. Therefore, as described in claim 1, it is important to be able to effectively remove bubbles remaining in the vicinity of the final end.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an outline of an entire inkjet recording apparatus 1 incorporating an inkjet head according to an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view showing a main part of the printing mechanism 2 shown in FIG.
FIG. 3 is a perspective view showing the inkjet head 4 shown in FIG. 2 alone.
4 is a cross-sectional view taken along line IV-IV in FIG.
5 is a cross-sectional view taken along line VV in FIG.
6 is a view showing the inkjet head 4 with a cross section taken along line VI-VI in FIG. 2;
FIG. 7 is an enlarged view of a part VII in FIG.
8 is an enlarged view of a part VIII in FIG. 6 and shows a part of the joint surface of the actuator 7 to the manifold 8. FIG.
9 is a view showing the vicinity of the final end of the supply path 16 with a cross section taken along line IX-IX in FIG. 8;
10 is an enlarged view corresponding to FIG. 7, showing an inlet end of a channel 6 on the actuator 7 side and a supply path 16 on the manifold 8 side provided in an ink jet head of interest to the present invention.
11 is a view corresponding to FIG. 8 in the inkjet head of FIG. 10;
[Explanation of symbols]
  1 Inkjet recording device
  2 Printing mechanism
  3 Purge device
  4 Inkjet head
  5 Ink cartridge
  6 channels
  7 Actuator
  8 Manifold
  9 nozzles
  16 Supply path
  39,39a bubbles
  40 deepest part
  41 center line

Claims (7)

A plurality of channels for containing ink formed in an aligned state, and an actuator that drives the ink in the channels to be ejected as droplets from a nozzle;
It is joined to the actuator on the inlet end side of the channel, and extends in the alignment direction of the plurality of channels to supply ink to each channel, and is common to each inlet end of the channel In an inkjet head comprising a manifold formed with a supply path that opens to
The width of the terminal portion of the supply path in the direction along the center line of the channel is narrowed toward the final end, and the width in the direction perpendicular to the center line of the channel and the alignment direction is toward the final end. An inkjet head characterized by being narrowed. 2. The deepest portion of the supply path that is farthest from the opening portion for each inlet end of the channel is located at a position shifted from a position through which the center line of the channel passes. Inkjet head.   The end of the supply path is characterized in that the deepest portion extends closer to a position through which the center line of the channel passes as it goes to the final end of the supply path. Inkjet head. An actuator configured to form a plurality of channels containing ink in an aligned state and drive the ink in the channels to be ejected as droplets from a nozzle;
  It is joined to the actuator on the inlet end side of the channel, and extends in the alignment direction of the plurality of channels to supply ink to each channel, and is common to each inlet end of the channel A manifold with a supply channel that opens to
In an inkjet head comprising:
  The width of the end portion of the supply path is made narrower as it goes to its final end,
  The supply path has a deepest portion located farthest from the opening portion for each inlet end of the channel at a position shifted from a position through which the center line of the channel passes,
  In the end portion of the supply path, the deepest portion extends so as to approach the position where the center line of the channel passes as it reaches the final end of the supply path. The inkjet head according to any one of claims 2 to 4, wherein the deepest portion is located at an uppermost position in the gravity direction in the supply path. The supply path includes an inner wall facing the inlet end of the channel and inclined with respect to the center line of the channel;
  The inkjet head according to claim 2, wherein the deepest portion is a portion of the inner wall that is farthest from the inlet end. The plurality of channels are formed in an aligned state in each row while forming a plurality of rows, and the supply path is formed along each row of the plurality of channels, respectively. The inkjet head according to any one of 6 .

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