JP5141062B2 - Droplet discharge head - Google Patents

Description

  The present invention relates to a droplet discharge head that discharges droplets from a plurality of nozzles and is applied to a surface of an object in a dot matrix form.

Conventionally, as a droplet discharge head that discharges droplets onto a medium, for example, an inkjet head that discharges ink onto a recording sheet or the like is known. The ink jet head includes a plurality of nozzle rows for each type of ink to be ejected. Then, the ink supplied from the external ink supply source is distributed from the ink supply port to the pressure chamber corresponding to each nozzle through the ink flow path, and the discharge pressure is applied in each pressure chamber, so that the ink is supplied from the nozzle. It is ejected as ink droplets on the surface of the object. The plurality of nozzle rows as described above are arranged in parallel for each type of ink to be ejected, or nozzle rows having different types of ink to be ejected are linearly arranged as in Patent Document 1. In some cases. In either case, each ink supply port is arranged in the extending direction of the nozzle row in plan view.
Japanese Patent Laid-Open No. 2001-219555 (pages 4 to 5, FIGS. 1 and 2)

  However, as described above, when the ink supply port is arranged in the extension direction of the nozzle row in a plan view, the dimension of the inkjet head in the length direction of the nozzle row is the length necessary for ink ejection, That is, there is an inconvenience that it is longer than the length of the nozzle row and it is difficult to reduce the size. In response to this problem, if the length is reduced by reducing the length of the nozzle row, the width at which ink can be ejected at the same time becomes small, so that efficient ink application cannot be performed. Also inconvenient.

  Accordingly, an object of the present invention is to provide a droplet discharge head that can efficiently discharge droplets while suppressing an increase in the size of the droplet discharge head in the length direction of the nozzle row.

The droplet discharge head according to claim 1 includes a nozzle plate in which a plurality of nozzles that discharge droplets form a plurality of nozzle rows for each liquid to be discharged, and a nozzle that has one end communicating with the plurality of nozzles. A pressure chamber communicates with a cavity plate formed to form a plurality of pressure chamber rows corresponding to the plurality of nozzle rows, and the other end of the pressure chamber, and the liquid is respectively supplied to the pressure chamber rows. The plurality of common liquid chambers to be supplied are formed by laminating a plurality of plates including a plurality of manifold plates formed for each of the liquids, and the liquid is supplied to the plurality of common liquid chambers. a droplet discharge head having a plurality of liquid supply ports for each liquid, the plurality of manifold plates is disposed in between the nozzle plate and the cavity plate, small Be laminated to the first manifold plate and the second manifold plate has, wherein the first manifold plate, a plurality of first common liquid chamber for each prior Symbol liquids Ru extending parallel to the column direction of the pressure chamber rows The second manifold plate communicates with the first common liquid chamber at a position overlapping with a part of the first common liquid chamber in plan view, and has a length in the column direction. 1 is shorter than the common liquid chamber second common liquid chamber have been formed for each of the liquid, the plurality of liquid supply ports, penetrating in the stacking direction from the cavity plate to said second manifold plate, in a plan view, the be formed every liquid in a direction orthogonal to the column direction, further wherein the second manifold plate, connecting said each second common liquid chamber wherein the respective liquid supply ports respectively That a plurality of connecting channels are formed in a concave shape which is opened prior Symbol surface opposite to the first manifold plate Rutotomoni and intersects with the pressure chamber rows in a direction the orthogonal in plan view across the pressure chamber rows It is characterized by extending .

  According to the droplet discharge head of this aspect, the plurality of liquid supply ports are formed in a direction orthogonal to the column direction of the pressure chamber rows, and the liquid supply ports are arranged in the column direction. Since each of the orthogonal connection passages communicates with the second common liquid chamber, the length in the column direction can be suppressed.

  The liquid droplet ejection head according to claim 2 is characterized in that the plurality of liquid supply ports are provided in one of the directions orthogonal to the row direction of the plurality of nozzle rows in a plan view.

  According to the droplet discharge head of the second aspect, since the plurality of liquid supply ports are gathered in one side, it is easy to arrange an actuator that applies discharge pressure to the plurality of pressure chambers.

  The droplet discharge head according to a third aspect is characterized in that, in a plan view, nozzle rows are provided on both sides of a plurality of liquid supply ports.

  According to the droplet discharge head of this aspect, the length of all the connection passages can be shortened.

  The droplet discharge head according to a fourth aspect is characterized in that the plurality of liquid supply ports are arranged in parallel to the row direction of the nozzle rows.

  According to the droplet discharge head of the fourth aspect, the length in the direction orthogonal to the row direction of the nozzle row can be suppressed.

According to a fifth aspect of the present invention, a plurality of liquid flow paths for each of the nozzles communicating with the first common liquid chamber, the pressure chamber, and the nozzle are formed on a plurality of plates, The two-manifold plate is characterized in that it extends between the liquid flow paths to the second common liquid chamber.

According to the droplet discharge head of this aspect, the liquid supply port and the second common liquid chamber communicate with each other by forming the connection flow path so as to pass between the liquid flow paths. The length of the column in the column direction can be suppressed.

  According to a sixth aspect of the present invention, the droplet discharge head communicates with the first connection passage passing between the liquid flow paths and the first connection passage, and is located below the first common liquid chamber and connected to the first connection passage. A feature is that the second connecting passage is wider than the passage.

  According to the droplet discharge head of the sixth aspect, the second connecting passage can absorb the pressure fluctuation of the first common liquid chamber in the first manifold plate.

  The droplet discharge head according to claim 7, wherein the second connection passage is formed between the liquid supply port and the corresponding second common liquid chamber, and among the plurality of first common liquid chambers of the first manifold plate, A portion of the first common liquid chamber corresponding to the second common liquid chamber other than the second common liquid chamber to be connected overlaps with a part of the first common liquid chamber in plan view.

According to the droplet discharge head of this aspect, the second connection passage can absorb pressure fluctuations of the plurality of first common liquid chambers in the first manifold plate.

  The droplet discharge head according to claim 8, in a portion where the connection passage and the second common liquid chamber are not formed in the second manifold plate, in the column direction at a position overlapping the first common liquid chamber in plan view. A concave damper chamber having an opening on the opposite surface to the first manifold plate extending in the direction is formed.

  According to the droplet discharge head of this aspect, the damper chamber can absorb pressure fluctuations in the plurality of first common liquid chambers.

  The droplet discharge head according to claim 9 communicates with the first and second common liquid chambers between the first manifold plate and the second manifold plate, and overlaps the second common liquid chamber in plan view. A damper plate provided with a third common liquid chamber for each of the liquids penetrating is interposed, and the damper plate is positioned so as to overlap the first common liquid chamber in a plan view, and the third common liquid chamber is disposed in the damper plate. A damper chamber that extends in the row direction and opens in the surface on the second manifold plate side and is formed in a concave shape is provided at a position isolated in the row direction of the liquid chamber.

According to the droplet discharge head of the ninth aspect, the damper chamber can absorb pressure fluctuations of the plurality of first common liquid chambers in the first manifold plate.

  The droplet discharge head according to the first aspect of the present invention can reduce the length of the nozzle row in the row direction even when the number of nozzles is increased and the length of the nozzle row is increased. Application is possible.

  In the droplet discharge head of the second aspect, the actuator for supplying pressure to the pressure chamber can be easily arranged, and the structure of the droplet discharge head unit including the actuator can be simplified.

  The droplet discharge head according to the third aspect can suppress the flow resistance of the liquid in the connection passage for supplying the liquid from the supply port to the second common liquid chamber.

  In the droplet discharge heads according to the fourth and fifth aspects, the size in the direction orthogonal to the row direction of the nozzle row can be made compact.

  In the droplet discharge heads of the sixth and seventh aspects, since the second connection passage absorbs the pressure fluctuation of the first common liquid chamber in the first manifold plate, the damper chamber can be omitted and the structure is simplified. Can be

  The droplet discharge heads according to the eighth and ninth aspects can absorb the pressure fluctuation of the first common liquid chamber by providing the damper chamber.

  As shown in FIG. 1, an inkjet head 1 that is an embodiment of a liquid discharge head according to the present invention includes a flow path unit 100 and an actuator 200. The flow path unit 100 has a structure in which a plurality of rectangular plates in a plan view are stacked, and the nozzle plate 2 and the second manifold plate 3 are arranged from the side facing the object surface (the lower side in FIG. 1). The first manifold plate 4, the supply plate 5, and the cavity plate 6 are laminated in this order. The nozzle plate 2 is made of a synthetic resin material such as polyimide, and the other plates 3 to 6 are made of 42% nickel alloy steel.

  The nozzle plate 2 is provided with a plurality of nozzles 21, 21, 21. The plurality of nozzles 21, 21, 21... Constitutes four nozzle rows 2 a, 2 b, 2 c, 2 d arranged in parallel, and these nozzle rows 2 a, 2 b, 2 c, 2 d are The same color ink is ejected from the nozzles 21, 21, 21... Of the same nozzle row 2 a, 2 b, 2 c, 2 d, for example, black, cyan, magenta In addition, four colors of yellow ink can be ejected. The nozzles 21, 21, 21... Of each nozzle row 2 a, 2 b, 2 c, 2 d may be arranged in a staggered manner. In the following description, the nozzle row direction is the X direction, the direction perpendicular to the row direction is the Y direction, the object side is the lower side or the lower direction, and the opposite side is the upper side or the upper direction. The 2a side is the left side, and the 2d side is the right side.

  The second manifold plate 3 has a longitudinal direction on one side (left side in FIG. 1) in a direction (Y direction) orthogonal to the row direction (X direction) of the nozzle rows 2a, 2b, 2c, and 2d in plan view. Is provided in each ink with through-holes 3a, 3b, 3c, and 3d having a substantially rectangular shape (which may be an oval shape) in plan view, and these through-holes 3a, 3b, 3c, and 3d are The nozzle rows 2a, 2b, 2c and 2d are arranged in a straight line in parallel (X direction). Through holes 4a, 4b, 4c, 4d, 5a, 5b, 5c, 5d, 6a, 6b, 6c, and 6d corresponding to these through holes 3a, 3b, 3c, and 3d are the first manifold plate 4 and the supply plate 5. Each of the four ink supply ports 7 a, 7 b, 7 c, and 7 d that individually supply four colors of ink is formed by laminating the cavity plate 6 from the second manifold plate to the cavity plate 6. (FIGS. 3A and 3B).

  Further, the second manifold plate 3 is provided with micro holes 31, 31, 31... Penetrating at positions corresponding to the nozzles 21, 21, 21. . .., 51, 51, 51... Corresponding to these micro holes 31, 31, 31... Are provided in the first manifold plate 4 and the supply plate 5, respectively. Are part of the ink flow paths 71, 71, 71. .., 41, 41, 41..., 51, 51, 51... May be referred to as nozzle rows 2a, 2b, 2c, and 2d for convenience. In addition, second common ink chambers 3a ′, 3b ′, 3c ′, and 3d ′ that are substantially elongated in plan view and that are long in the X direction pass through the through holes 3a, 3b, 3c, and 3d. It has been. The second common ink chamber is shorter than the dimension in the X direction of the first common ink chamber. In FIG. 2, the lengths of the through holes 3a, 3b, 3c, and 3d in the X direction are substantially the same.

  The second common ink chambers 3a ′, 3b ′, 3c ′, and 3d ′ are arranged from one end (left side in FIG. 1) to the other end (right side in FIG. 1) in the Y direction of the second manifold plate 3. ), The distance from the corresponding through holes 3a, 3b, 3c, 3d is increased in order. That is, in plan view, the second common ink chamber 3a ′ located at the extreme end (left end) is located between the through hole 3a and the nozzle row 2a, and the second second common ink chamber 3b ′ is penetrated. The third second common ink chamber 3c ′ is located between the second nozzle row 2b and the third nozzle row 2c from the side of the hole 3b and closer to the second nozzle row 2b. It is located between the nozzle row 2b and the third nozzle row 2c and closer to the third nozzle row 2c. The fourth second common ink chamber 3d 'is provided at a position separating the four nozzle rows 2a, 2b, 2c and 2d from the through hole 3d.

  These through holes 3a, 3b, 3c and 3d and the corresponding second common ink chambers 3a ', 3b', 3c 'and 3d' are connected by connecting passages 32a, 32b, 32c and 32d extending in the Y direction, respectively. Yes. These connection passages 32a, 32b, 32c, and 32d are provided by forming a surface opposite to the first manifold plate 4 into a concave shape by half etching or the like.

  The connection passage 32a extending in the Y direction that connects the through hole 3a and the second common ink chamber 3a 'includes a plurality of passages provided in parallel in the X direction. The other connection passages 32b, 32c, and 32d are composed of first connection passages 33b, 33c, and 33d and second connection passages 34b, 34c, and 34d. The first connection passages 33b, 33c, 33d are provided in a range where the micro holes 31, 31, 31,... (Ink flow paths 71, 71, 71,...) Are formed. A plurality of passages arranged in parallel in the X direction so as to pass between 31, 31... And extending in the Y direction. On the other hand, the second connection passages 34b, 34c and 34d are provided in portions located below a first common ink chamber 4b ', 4c' and 4d 'which will be described later, and the first connection passages 33b and 33c.・ It is wider than 33d. The width is substantially the same as the width (width in the X direction) in which the through holes 3a, 3b, 3c, and 3d are provided, and the first connection passages 33b, 33c, and 33d are connected to each other. While the through holes 3a, 3b, 3c, and 3d communicate with the corresponding second common ink chambers 3a ', 3b', 3c ', and 3d', a plurality of first and second connection passages are appropriately provided. When the second manifold plate 3 is stacked on the nozzle plate 2 in continuous communication, the corresponding through holes 3b, 3c, 3d and the second common ink chamber 3b ′ are formed by the second connection passages 34b, 34c, 34d. A damper chamber is formed to absorb pressure fluctuations of 3c ′, 3d ′ and the first common ink chambers 4b ′, 4c ′, 4d ′.

  As shown in FIG. 2B, the second manifold plate 3 has second common ink chambers 3b ′, 4b ′, 4c ′, 4d ′ at positions corresponding to the first common ink chambers 4b ′, 4c ′, 4d ′ in plan view. Half-etching on the nozzle plate side, etc. at a position spaced apart from the second common ink chambers 3b ′, 3c ′, 3d ′ in the X direction in the portions where 3c ′, 3d ′ and the second connection passages 34c, 34d are not provided It is also possible to provide concave damper walls 35b, 35c, and 35d that are opened in the above. In this way, the damper chamber can be formed between the nozzle plate 2 and the pressure fluctuation with respect to the first common ink chamber can be absorbed more effectively.

  In addition to the micro holes 41, 41, 41... And the through holes 4a, 4b, 4c, 4d, the first manifold plate 4 includes first common ink chambers 4a ′, 4b ′, 4c ′, 4d ′ for each ink. Is provided. Each of the first common ink chambers 4a ′, 4b ′, 4c ′, and 4d ′ has a substantially rectangular through-hole in a plan view and has a length equivalent to the nozzle rows 2a, 2b, 2c, and 2d with the longitudinal direction in the X direction. In a plan view, and a portion thereof overlaps with each of the second common ink chambers 3a ′, 3b ′, 3c ′, and 3d ′ provided in the second manifold plate 3 in plan view. Placed in position.

  In addition to the through holes 5a, 5b, 5c, 5d and the minute holes 51, 51, 51..., The supply plate 5 includes first common ink chambers 4a ′, 4b ′, 4c ′,. Supply holes 52, 52, 52... For supplying 4d ′ ink to each pressure chamber provided in the cavity plate 6 described later have first common ink chambers 4 a ′, 4 b ′,. 4c 'and 4d' are provided so as to communicate with each other.

  The cavity plate 6 has a substantially elongated shape in plan view that generates ejection pressure for ejecting ink from the nozzles 21, 21, 21... Of the nozzle plate 2 in addition to the through holes 6 a, 6 b, 6 c, 6 d ( The pressure chambers 61, 61, 61... (Long in the Y direction) are provided for the nozzles 21, 21, 21... Of the nozzle plate 2, and four rows corresponding to the nozzle rows 2 a, 2 b, 2 c, 2 d Is arranged. Each of the pressure chambers 61, 61, 61,... Is provided by forming a long hole that is long in the Y direction in a plan view, one end of which overlaps with the corresponding nozzle 21, 21, 21,. The ends are arranged so as to overlap the supply holes 52, 52, 52... Of the supply plate 5. Accordingly, the second common ink chambers 3a ′, 3b ′, 3c ′, and 3d ′ of the second manifold plate 3, the first common ink chambers 4a ′, 4b ′, 4c ′, and 4d ′ of the first manifold plate 4 are supplied. .. Of the plate 5, the pressure chambers 61, 61, 61... Of the cavity plate 6, and the micro holes 31 provided in each plate from the supply plate 5 to the second manifold plate 3. ..., 41. 71, 71... Are configured. The opposite side of the through holes 6a, 6b, 6c and 6d from the supply plate 5 is covered with a filter (not shown).

    On the cavity plate 6 side of the ink jet head 1, an actuator 200 having an outer dimension that is slightly smaller than the cavity plate 6 is stacked with the ink supply ports 6 a, 6 b, 6 c, and 6 d exposed ( FIG. 1). The actuator 100 includes a piezoelectric sheet in which an individual electrode (not shown) arranged at a position overlapping the pressure chambers 61, 61, 61... Of the cavity plate 6 and a common electrode (not shown) common to the pressure chamber 61 are planarly viewed. It is configured by alternately laminating them. Then, by applying a high voltage between the electrodes in the stacking direction, distortion in the stacking direction due to the piezoelectric longitudinal effect is generated in the piezoelectric sheet, and the ink in the pressure chambers 61, 61, 61.・ Discharge from 21 ... As the actuator, in addition to the piezoelectric method, a method of displacing the diaphragm by static electricity, a method of boiling ink in the pressure chamber by a heater, or the like can be applied.

  In the inkjet head 1 of the present embodiment, the ink supply ports 7a, 7b, 7c, and 7d are positioned in a direction (Y direction) orthogonal to the row direction of the nozzle rows 2a, 2b, 2c, and 2d in the plan view. The communication between the first common ink chambers 4a ', 4b', 4c 'and 4d' of the first manifold plate 4 and the second common ink chambers 3a ', 3b', 3c 'and 3d' of the second manifold plate 3 Are connected by connection passages 32a, 32b, 32c, and 32d that extend in the direction and pass between the ink flow paths 71, 71, 71. The size in the column direction of 2c and 2d can be made compact. Further, since the ink supply ports 7a, 7b, 7c, and 7d are provided in parallel to the nozzle rows 2a, 2b, 2c, and 2d, the size is also increased in the direction orthogonal to the row direction of the nozzle rows 2a, 2b, 2c, and 2d. Can be small. Since the ink supply ports 7a, 7b, 7c, and 7d are gathered in one of the directions orthogonal to the row direction of the nozzle rows 2a, 2b, 2c, and 2d in plan view, the actuators can be easily arranged. Note that a spacer plate in which a throttle portion is formed may be provided between the cavity plate 6 and the first manifold plate 5.

    In the inkjet head 1 of the above embodiment, the connection passages 32b, 32c, and 32d are configured by the first connection passages 33b, 33c, and 33d and the second connection passages 34b, 34c, and 34d having a damper function. As shown in FIG. 4, the second connection passages 34 b, 34 c, and 34 d may be configured not to have a damper function. The second connection passages 34b, 34c, and 34d in FIG. 4 are formed by extending a plurality of passages of the first connection passages 33b, 33c, and 33d. In such a case, a damper plate 8 is provided between the first manifold plate 4 and the second manifold plate 3 to absorb pressure fluctuations in the first common ink chambers 4a ′, 4b ′, 4c ′, and 4d ′. be able to. 4 is a view of the flow path unit 100 as viewed from the lower side (object side) for the sake of explanation, and the left and right sides of FIG. 1 are reversed.

  For example, as shown in the plan view of FIG. 5A and the JJ ′ sectional view of FIG. 4 when the damper plate 8 of FIG. 5B is provided, the damper plate 8 is the same as other plates. Through holes 8a, 8b, 8c, 8d constituting the ink supply ports 7a, 7b, 7c, 7d, and micro holes 81, 81, 81,. Is provided. Also, the first common ink chambers 4a ′, 4b ′, 4c ′, 4d ′ of the first manifold plate 4 and the second common ink chambers 3a ′, 3b ′, 3c ′, 3d ′ of the second manifold plate 3 The third common ink chambers 8a ′, 8b ′, and 8c ′ formed so as to penetrate the second common ink chambers 3a ′, 3b ′, 3c ′, and 3d ′ in plan view so as to communicate with each other. -8d 'is provided respectively. In plan view, the first common ink chambers 4a ′, 4b ′, 4c ′, and 4d ′ overlap with each other in the X direction of the third common ink chambers 8a ′, 8b ′, 8c ′, and 8d ′. Damper walls 82 a ′, 82 b ′, 82 c ′, 82 d ′ extending in the row direction of the nozzle rows 2 a, 2 b, 2 c, 2 d are formed in a concave shape on the surface on the second manifold 3 side at the isolated positions. These damper walls 82 a ′, 82 b ′, 82 c ′, 82 d ′ are laminated with the second manifold plate 3 to form a damper chamber, and each first common ink chamber 4 a ′, 4 b of the first manifold plate 4 is formed. It is possible to absorb pressure fluctuations of “4c” and 4d. In addition, a damper plate 8 is further provided in the inkjet head 1 provided with the second connection passages 34b, 34c, and 34d having a damper function, and the first common ink chambers 4a ′, 4b ′,. It is also possible to enhance the function of absorbing pressure fluctuations of 4c ′ and 4d ′.

  In the inkjet head 1 of the above embodiment, the ink supply ports 7a, 7b, 7c, and 7d are provided in one of the directions orthogonal to the row direction of the nozzle rows in plan view. Ink supply ports 7a, 7b, 7c and 7d may be arranged between 2c and 2d. For example, as shown in FIG. 6, when two nozzle rows 2a, 2b, 2c, and 2d are arranged on both sides of the ink supply ports 7a, 7b, 7c, and 7d in a plan view, the connection path Since the length of the connection passages 32c and 32d can be made shorter than in the above-described embodiment, the ink flow path resistance can be reduced. Further, the variation in the ink flow path resistance between the connection passages is smaller than in the above-described embodiment.

  Further, if two ink supply ports 7a, 7b, 7c, and 7d are arranged on both sides of the nozzle rows 2a, 2b, 2c, and 2d, the lengths of all the connection passages 32a, 32b, 32c, and 32d are shortened. Thus, it is possible to reduce the ink flow path resistance and facilitate the arrangement without dividing the actuator.

  In addition, a plate such as a spacer plate or a damper plate that forms the throttle portion can be added as necessary. Further, the number of nozzle rows is not limited to four, and the present invention can be used in the case of a larger number of rows.

  The liquid discharge head of each of the above embodiments is an apparatus for adhering various liquids as droplets to an object, such as forming a wiring pattern of a printed wiring board and manufacturing a liquid crystal color filter, as well as an inkjet printer head Applicable to.

FIG. 3 is an exploded perspective view showing an embodiment of an inkjet head according to the liquid discharge head of the present invention. (A) is a top view of each plate which comprises the actuator of the inkjet head of FIG. (B) is a top view which shows another embodiment of a 2nd damper plate. (A) is each sectional drawing of A-A ', B-B', C-C ', D-D' in FIG. (B) is each sectional drawing of E-E ', F-F', G-G ', H-H', and I-I 'in FIG. FIG. 6 is an exploded perspective view showing an actuator according to another embodiment of the liquid ejection head according to the present invention. (A) is a top view of a damper plate. FIG. 5B is a cross-sectional view taken along line J-J ′ when a damper plate is provided on the actuator of the inkjet head of FIG. 4. FIG. 10 is an exploded perspective view showing an actuator according to another embodiment of the liquid discharge head according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inkjet head 2 Nozzle plate 2a-2d Nozzle row | line | column 21 Nozzle 3 2nd manifold plate 3a'-3d '2nd common ink chamber 32a-32d Connection passage 4 1st manifold plate 4a'-4d' 1st common ink chamber 6 Cavity Plate 61 Pressure chamber 7a-7d Ink supply port

Claims (9)

A plurality of nozzles for discharging droplets, a nozzle plate in which a plurality of nozzle rows are formed for each liquid to be discharged; and
A cavity plate formed by forming a plurality of pressure chamber rows corresponding to the plurality of nozzle rows, the pressure chamber for each nozzle having one end communicating with the plurality of nozzles;
A plurality of plates including a plurality of manifold plates each communicating with the other end of the pressure chamber and supplying a plurality of common liquid chambers for each of the pressure chamber rows. Is formed by laminating
A liquid droplet ejection head having a plurality of liquid supply ports for each of the liquids for supplying the liquid to the plurality of common liquid chambers;
The plurality of manifold plates are disposed between the nozzle plate and the cavity plate, and have a stack of at least a first manifold plate and a second manifold plate,
Wherein the first manifold plate, have been formed with a plurality of first common liquid chamber for each prior Symbol liquids Ru extending parallel to the column direction of the pressure chamber rows,
The second manifold plate communicates with the first common liquid chamber at a position overlapping a part of the first common liquid chamber in plan view, and has a length in the column direction that is longer than that of the first common liquid chamber. A short second common liquid chamber is formed for each liquid;
The plurality of liquid supply ports penetrate in the stacking direction from the cavity plate to the second manifold plate, and are formed for each liquid in a direction orthogonal to the column direction in plan view,
More said second manifold plate, a plurality of connecting passage connecting said each second common liquid chamber wherein the respective liquid supply ports respectively, is pre-SL recessed opened in the surface opposite to the first manifold plate And a droplet discharge head that extends across the pressure chamber row in a direction orthogonal to the pressure chamber row in a plan view .   2. The droplet discharge head according to claim 1, wherein the plurality of liquid supply ports are provided in one of the directions orthogonal to the row direction of the plurality of nozzle rows in a plan view.   2. The droplet discharge head according to claim 1, wherein the nozzle row is provided on both sides of the plurality of liquid supply ports in a plan view.   4. The liquid droplet ejection head according to claim 1, wherein the plurality of liquid supply ports are arranged in parallel with a row direction of the nozzle row. The plurality of plates are formed with a plurality of liquid flow paths for each nozzle communicating the first common liquid chamber, the pressure chamber, and the nozzle,
5. The liquid droplet according to claim 1, wherein the connection passage extends in the second manifold plate between the liquid flow paths to the second common liquid chamber. Discharge head.   The connection passage communicates with the first connection passage that passes between the liquid flow paths and the first connection passage, and is positioned below the first common liquid chamber and has a second width wider than the first connection passage. The droplet discharge head according to claim 5, wherein the droplet discharge head is connected to a connection passage. The second connection passage is formed between the liquid supply port and the corresponding second common liquid chamber,
Among the plurality of first common liquid chambers of the first manifold plate, in a plan view, a part of the first common liquid chamber corresponding to the second common liquid chamber other than the second common liquid chamber to be connected. The droplet discharge head according to claim 6, wherein the droplet discharge head is formed at an overlapping position.   The first manifold extending in the column direction at a position overlapping the first common liquid chamber in a plan view in a portion where the connection passage and the second common liquid chamber are not formed in the second manifold plate. The liquid droplet ejection head according to claim 1, wherein a concave damper chamber opened on a surface opposite to the plate is formed. Each of the liquids communicated with the first and second common liquid chambers between the first manifold plate and the second manifold plate and penetrated at a position overlapping the second common liquid chamber in plan view. A damper plate provided with a third common liquid chamber is interposed,
The damper plate extends in the row direction at a position overlapping the first common liquid chamber in a plan view and isolated from the row direction of the third common liquid chamber, and the second plate 6. The liquid droplet ejection head according to claim 1, further comprising a damper chamber that is formed in a concave shape so as to open on a surface on the manifold plate side.

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