JP3979174B2 - Inkjet head - Google Patents

Inkjet head Download PDF

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Publication number
JP3979174B2
JP3979174B2 JP2002135506A JP2002135506A JP3979174B2 JP 3979174 B2 JP3979174 B2 JP 3979174B2 JP 2002135506 A JP2002135506 A JP 2002135506A JP 2002135506 A JP2002135506 A JP 2002135506A JP 3979174 B2 JP3979174 B2 JP 3979174B2
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Japan
Prior art keywords
flat plate
pressure chamber
flow path
ink
restriction
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Application number
JP2002135506A
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Japanese (ja)
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JP2003326702A (en
Inventor
敦 伊藤
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ブラザー工業株式会社
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Priority to JP2002135506A priority Critical patent/JP3979174B2/en
Priority claimed from US10/431,389 external-priority patent/US6846069B2/en
Publication of JP2003326702A publication Critical patent/JP2003326702A/en
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Publication of JP3979174B2 publication Critical patent/JP3979174B2/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01Ink jet
    • B41J2/135Nozzles
    • B41J2/14Structure thereof only for on-demand ink jet heads
    • B41J2/14201Structure of print heads with piezoelectric elements
    • B41J2/14209Structure of print heads with piezoelectric elements of finger type, chamber walls consisting integrally of piezoelectric material
    • B41J2002/14217Multi layer finger type piezoelectric element
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01Ink jet
    • B41J2/135Nozzles
    • B41J2/14Structure thereof only for on-demand ink jet heads
    • B41J2/14201Structure of print heads with piezoelectric elements
    • B41J2/14209Structure of print heads with piezoelectric elements of finger type, chamber walls consisting integrally of piezoelectric material
    • B41J2002/14225Finger type piezoelectric element on only one side of the chamber
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01Ink jet
    • B41J2/135Nozzles
    • B41J2/14Structure thereof only for on-demand ink jet heads
    • B41J2/14201Structure of print heads with piezoelectric elements
    • B41J2002/14306Flow passage between manifold and chamber
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01Ink jet
    • B41J2/135Nozzles
    • B41J2/14Structure thereof only for on-demand ink jet heads
    • B41J2002/14419Manifold

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a configuration of an inkjet head that forms an image on a printing surface by ejecting fine ink droplets in an inkjet recording apparatus.
[0002]
[Prior art]
As an ink jet head provided in an ink jet recording apparatus such as an ink jet printer, the ink jet head includes a plurality of nozzles for ejecting ink onto a printing surface, a pressure chamber provided for each nozzle and connected to the nozzle, A configuration in which a common ink chamber for distributing and supplying ink to a pressure chamber is provided inside an inkjet head is known. The common ink chamber is connected to an ink supply source (for example, an ink tank) (not shown) via an ink supply port provided on the outer surface of the inkjet head.
With this configuration, the ink introduced from the ink supply source into the common ink chamber is distributed and supplied to each pressure chamber. An actuator made of, for example, a piezoelectric element is provided in the pressure chamber, and ink to which ejection energy is given by driving the actuator is ejected from the nozzle to form a desired image on the printing surface.
[0003]
In order to form these pressure chambers, common ink chambers, and the like, a method of laminating and fixing thin flat plate groups in which the shapes of the pressure chambers, the common ink chambers, etc. are formed in advance by etching or the like is widely adopted. ing.
[0004]
In addition, in order to efficiently apply the pressure generated in the ink in the pressure chamber by driving the actuator to the nozzle side, the configuration of an ink jet head provided with a restriction channel that restricts the pressure toward the common ink chamber is also widely known. .
[0005]
An example of this configuration is shown in FIG. 11, and the inkjet head 6 of FIG. 11 includes a cavity plate 10 formed by laminating six thin metal flat plates (11, 12, 13X, 13Y, 14, 15). Prepare. The common ink chamber 7 and the pressure chamber 36 are formed in the cavity plate 10. Reference numeral 35 denotes a nozzle.
In this configuration, the ink introduced from the ink supply port (not shown) into the common ink chamber 7 reaches the end portion 36b of the pressure chamber 36 via the ink supply hole 38 and passes through the throttle portion (restricted flow path) 36d. Then, it is guided into the pressure chamber 36. Then, the ink in the pressure chamber 36 to which the ink ejection pressure is applied by driving the actuator 20 reaches the nozzle 35 through the through hole 37 and is ejected toward the lower printing surface (not shown).
[0006]
The restricting flow path 36d is formed in a groove shape by half-etching from the lower surface side of the flat plate 15, and the flow passage cross-sectional area of the formed restrictive flow path 36d is suppressed to be smaller than that of the pressure chamber 36. The flow path resistance for restricting the ink flow flowing back to the common ink chamber 7 side is ensured.
[0007]
[Problems to be solved by the invention]
However, in the conventional ink jet head 6 as shown in FIG. 11, the restriction flow path 36d is provided on the same flat plate (flat plate 15) as the pressure chamber 36 in the extending direction of the pressure chamber 36. In addition, a width of (the length of the pressure chamber) + (the length of the restriction channel) is required. Therefore, there has been a disadvantage that it is difficult to meet the demand for higher integration accompanying the need for downsizing the inkjet head and higher resolution of images.
[0008]
Further, the pressure chamber 36 and the restriction flow path 36a are required to have high accuracy in the ink jet head, and both of them must be processed at the same time with high accuracy, and the manufacturing yield is poor. There was a problem that the cost increased.
Furthermore, another problem is that in order to make the restricted flow path 36a in the same flat plate 15 as the pressure chamber 36, a groove shape is formed by half etching in order to obtain a necessary cross section of the flow path. The depth must be machined with high accuracy, and the manufacturing yield is poor and the cost increases.
[0009]
[Means for Solving the Problems]
The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.
[0010]
That is, according to the first aspect, a plurality of nozzles for ejecting ink to the printing surface, a pressure chamber provided corresponding to each of the nozzles and connected to the nozzle, and one end of the pressure chamber Via the communication channel A restricted flow path connecting one end of the This A common ink chamber for distributing and supplying ink to the pressure chamber connected to the other end of the restriction flow path, and a flat plate constituting the head unit. A first flat plate that forms the pressure chamber; a second flat plate that forms the common ink chamber; and a third plate that is located between the first flat plate and the second flat plate that forms the restriction channel. And the restriction channel is formed in the third flat plate so as to be long along the surface direction, and is parallel to the plane formed by the plurality of pressure chambers from one end connected to the pressure chamber. The path extending from the restriction flow path to the pressure chamber via the communication flow path has a “U” shape in a side view.
This makes it possible to arrange the restricting flow path in an arbitrary direction on a plane parallel to the pressure chamber including the position overlapping the pressure chamber in the stacking direction, and to make the inkjet head compact and highly integrated. In addition, by forming the pressure chamber and the restriction channel on separate flat plates, it is possible to reduce the cost by solving the problem that both must be processed at the same time with high accuracy as in the prior art.
Further, the ink that has flowed into the restricting flow path is reversed when it reaches the pressure chamber from the communication flow path, and flows in a folded shape. In this way, the pressure chamber and the restriction channel overlap with each other in the flat plate stacking direction, so that the ink passage leading to the nozzle via the restriction channel, the pressure chamber, and the communication channel has a small width. Can reasonably fit inside.
These can be easily realized by the following configuration.
[0011]
According to a second aspect of the present invention, the restriction channel is formed in the third flat plate in a penetrating manner, and a fourth flat plate is interposed between the third flat plate and the first flat plate, and the fourth flat plate is connected to the fourth flat plate. The communication channel that connects the restriction channel and the pressure chamber is provided.
[0012]
According to a third aspect of the present invention, the first flat plate and the third flat plate are laminated without using a flat plate, and the restriction channel is provided in a groove shape on the surface of the third flat plate opposite to the first flat plate. In addition, the communication flow path connecting the restriction flow path and the pressure chamber is provided in a penetrating manner on the third flat plate.
[0013]
According to a fourth aspect of the present invention, the restriction channel is located between the common ink chamber and the pressure chamber in the stacking direction of the flat plates, and the second flat plate and the third flat plate are stacked without using a flat plate, and The restriction flow path is provided in a groove shape on the surface of the third flat plate opposite to the second flat plate, and the communication flow path connecting the restriction flow path and the common ink chamber to the third flat plate. Is provided in a penetrating manner.
[0014]
According to a fifth aspect of the present invention, a plurality of nozzles for ejecting ink to the printing surface, a pressure chamber provided corresponding to each of the nozzles and connected to the nozzle, and one end of the pressure chamber Via the communication channel A restricted flow path connecting one end of the This A common ink chamber for distributing and supplying ink to the pressure chamber connected to the other end of the restriction flow path, and a flat plate constituting the head unit. A first flat plate that forms the pressure chamber; a second flat plate that forms the common ink chamber; and a third plate that is located between the first flat plate and the second flat plate that forms the restriction channel. And the restriction channel is formed in the third plate so as to extend in the surface direction and penetrates in the plate thickness direction, and the restriction channel has a long length. The cross section perpendicular to the vertical direction has the smallest cross-sectional area in the ink flow path from the common ink chamber to the pressure chamber, and the path flowing from the restriction flow path to the pressure chamber through the communication flow path is a side view. It has a “U” shape.
As a result, the depth of the restricted flow path is ensured with high accuracy at low cost regardless of half etching, and a predetermined flow path resistance can be obtained at low cost. In addition, the restriction channel can be arranged in any direction on a plane parallel to the pressure chamber including the position overlapping the pressure chamber in the stacking direction, and the inkjet head can be made compact and highly integrated. In addition, by forming the pressure chamber and the restriction channel on separate flat plates, it is possible to reduce the cost by solving the problem that both must be processed at the same time with high accuracy as in the prior art.
Further, the ink that has flowed into the restricting flow path is reversed when it reaches the pressure chamber from the communication flow path, and flows in a folded shape. In this way, the pressure chamber and the restriction channel overlap with each other in the flat plate stacking direction, so that the ink passage leading to the nozzle via the restriction channel, the pressure chamber, and the communication channel has a small width. Can reasonably fit inside.
These can be easily realized by the following configuration.
[0015]
According to a sixth aspect of the present invention, the restriction channel has a smaller cross-sectional area in the middle than both ends connected to the common ink chamber and the pressure chamber.
[0016]
According to a seventh aspect of the present invention, the third flat plate is the thinnest of the laminated flat plates constituting the ink jet head.
[0017]
According to an eighth aspect of the present invention, the restriction channel is positioned between the common ink chamber and the pressure chamber in the stacking direction of the flat plates, and a fourth flat plate is provided between the third flat plate and the first flat plate. A connecting flow path connecting the restricting flow path and the pressure chamber is provided on the fourth flat plate, and a fifth flat plate is interposed between the third flat plate and the second flat plate. 5. The flat plate is provided with the communication channel connecting the restriction channel and the common ink chamber.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view of a color inkjet printer including an inkjet head according to an embodiment of the present invention.
[0019]
In FIG. 1, a printer head 63 of the color ink jet printer 100 has a total of four arranged for each color in order to eject ink of four colors (for example, cyan, magenta, yellow, and black) onto its main body frame 68. A total of four ink cartridges 61 are fixedly attached to the main body frame 68 and fixed to each of the piezoelectric inkjet heads 6 and filled with color inks. The main body frame 68 is fixed to a carriage 64 that is reciprocated in a linear direction by a drive mechanism 65. The platen roller 66 for feeding paper is arranged so that its axis is along the reciprocating direction of the carriage 64, and faces the inkjet head 6.
[0020]
The carriage 64 is slidably supported by a guide shaft 71 and a guide plate 72 that are disposed in parallel with the support shaft of the platen roller 66. Pulleys 73 and 74 are supported near both ends of the guide shaft 71, and an endless belt 75 is stretched between the pulleys 73 and 74. The carriage 64 is fixed to the endless belt 75.
In such a configuration of the drive mechanism 65, when one pulley 73 is rotated forward and backward by the drive of the motor 76, the carriage 64 is reciprocated in a linear direction along the guide shaft 71 and the guide plate 72. The printer head 63 is reciprocated.
[0021]
The paper 62 is fed from a paper feed cassette (not shown) provided on the side of the ink jet printer 100, guided to the space between the ink jet head 6 and the platen roller 66, and ejected from the ink jet head 6. The paper is discharged after predetermined printing is performed with the ink. In FIG. 1, the paper feed mechanism and paper discharge mechanism for the paper 62 are not shown.
[0022]
The purge mechanism 67 is for forcibly sucking and removing defective ink containing bubbles, dust, etc. accumulated in the ink jet head 6.
The purge mechanism 67 is provided on the side of the platen roller 66, and the purge mechanism 67 is disposed so as to face the ink-jet head 6 when the printer head 63 reaches the reset position by the drive mechanism 65 described above. It has been established. The purge mechanism 67 includes a purge cap 81 and abuts against the lower surface of the inkjet head 6 so as to cover a large number of nozzles (details will be described later) provided on the lower surface of the inkjet head 6.
With this configuration, when the printer head 63 is at the reset position, the nozzles of the inkjet head 6 provided on the carriage 64 are covered with the purge cap 81, and defective ink containing bubbles or the like that accumulate in the inkjet head 6 is obtained. The ink jet head 6 is restored by being sucked by the pump 82 by the drive of the cam 83 and discarded in the waste ink reservoir 84. Thereby, bubbles can be removed at the time of initial introduction of ink to the ink jet head 6, or the ink jet head 6 can be returned to a normal state from an ejection failure state which has been caused by growth of internal bubbles accompanying printing.
Note that the cap 85 shown in FIG. 1 is for covering a large number of nozzles of the inkjet head 6 on the carriage 64 that is returned to the reset position after printing is completed, and prevents drying of the ink.
[0023]
A perspective view of the printer head 63 upside down is shown in FIG. As shown in the drawing, the main body frame 68 of the printer head 63 is formed in a substantially box shape with its upper surface side (shown so as to be located on the lower surface side in FIG. 2) opened. The mounting portion is formed so that the four ink cartridges 61 can be detachably mounted from the formed side.
As shown in FIG. 2, ink supply passages 4, 4, 4, 4 that can be connected to the ink discharge portions of the respective ink cartridges 61 are provided on one side portion of the mounting portion of the main body frame 68 on the bottom plate 5 of the main body frame 68. It communicates to the lower surface (the surface on the side where the inkjet head 6 is fixed). A joint member 47 made of rubber or the like is attached to the lower surface of the bottom plate 5 so as to be in close contact with an ink supply port (described later) of the inkjet head 6 corresponding to each ink supply passage 4.
[0024]
As shown in FIG. 2, on the lower surface side of the bottom plate 5, four support portions 8 for arranging the four inkjet heads 6 in parallel are formed in a stepped shape. The ink jet head 6 is fixed to each support portion 8 with an ultraviolet curable adhesive.
[0025]
A perspective view of the inkjet head 6 is shown in FIG. The inkjet head 6 has a laminated cavity plate 10, and a plate-type piezoelectric actuator (hereinafter referred to as “actuator”) 20 is bonded and laminated to the cavity plate 10 via an adhesive or an adhesive sheet. The Further, on the upper surface of the actuator 20, a flexible flat cable 40 for electrical connection with an external device is laminated and bonded with an adhesive. A number of nozzles 35 are opened on the lower surface side of the lowermost cavity plate 10, and ink is ejected downward from each nozzle 35.
[0026]
4 is an exploded perspective view of the cavity plate 10, and FIG. 5 is an exploded enlarged perspective view of the cavity plate 10 (cross section taken along the VV direction in FIG. 4).
As shown in FIG. 4 and FIG. 5, the cavity plate 10 is a total of eight thin plates including a nozzle plate 11, a damper plate 12, two manifold plates 13X and 13Y, three spacer plates 14X, 14Y and 14Z, and a base plate 15. Each metal plate has a structure in which the metal plates are laminated and bonded together with an adhesive.
[0027]
As shown in FIGS. 4 and 5, the nozzle plate 11 is provided with a large number of nozzles 35 for ejecting ink having a small diameter (in this embodiment, about 25 μm) by pressing. The nozzles 35 are arranged in two staggered rows along the longitudinal direction of the nozzle plate 11 at minute intervals.
[0028]
Base plate 15 (first flat plate P 1 5, a plurality of pressure chambers 36, 36... Are formed in two rows in a staggered arrangement along the longitudinal direction of the base plate 15. The specific shape of the pressure chamber 36 is shown in FIG. 5. As shown in this figure, each pressure chamber 36 is formed with a narrow width so that its longitudinal direction is perpendicular to the longitudinal direction of the base plate 15. Has been.
[0029]
Then, as shown in FIG. 6, one end portion 36a of each pressure chamber 36 is formed in three spacer plates 14X, 14Y and 14Z, two manifold plates 13X and 13Y, and damper plate 12 in a staggered arrangement. The nozzle plate 11 communicates with the above-described nozzle 35 through a through hole 37 having a small diameter.
[0030]
Upper spacer plate 14X (fourth flat plate P) adjacent to base plate 15 4 ) Are provided with ink supply holes (communication flow paths) 38 at positions corresponding to the pressure chambers 36, and the ink supply holes 38 are connected to the other end portions 36 b of the pressure chambers 36. Intermediate spacer plate 14Y (third flat plate P) located immediately below 3 ) Includes a narrowed portion (restricted flow path) 43 that is elongated along the surface direction of the intermediate spacer plate 14Y (specifically, elongated in parallel with the longitudinal direction of the pressure chamber 36) and penetrates in the plate thickness direction. Formed. The ink supply hole 38 communicates with one end of the throttle portion 43.
The other end of the throttle portion 43 is connected to the lower spacer plate 14Z (the fifth flat plate P 5 ) Communicates with a common ink chamber 7 to be described later through an introduction hole (communication flow path) 44 provided through the liquid crystal.
[0031]
FIG. 7 is a perspective view showing the outline of the ink flow path from the common ink chamber 7 to the nozzle portion 35 through the throttle portion 43, the pressure chamber 36, and in this figure, the throttle portion 43 is highlighted with a solid line. It is.
As shown in FIG. 7, the throttle portion 43 has a shape that is narrowed down at the center in the longitudinal direction. That is, the channel cross-sectional area (throttle portion 43) in the middle in the longitudinal direction is longer than the end connected to the pressure chamber 36 via the ink supply hole 38 and the end connected to the common ink chamber 7 via the introduction hole 44. The area (S) of the cross section perpendicular to the longitudinal direction) S is small. The flow path cross-sectional area S of the middle part of the throttle part 43 is minimized in the ink flow path from the common ink chamber 7 to the pressure chamber 36.
Due to this squeezing action, when an actuator 20 described later is driven, the pressure generated in the ink in the pressure chamber 36 is restricted from moving toward the common ink chamber 7 side, and is efficiently directed toward the nozzle 35 side. Good ink ejection can be performed. In addition, since both ends of the throttle part 43 are configured to have a larger channel cross-sectional area than the intermediate part, even if a slight misalignment occurs when the three spacer plates 14X, 14Y, and 14Z are bonded together, Communication between the hole 44 and the throttle part 43 and between the throttle part 43 and the ink supply hole 38 is ensured reliably (allowable margin for sticking deviation is increased).
[0032]
As shown in FIG. 5, two ink chamber halves 13a and 13a are formed in a penetrating manner on the upper manifold plate 13X on the side close to the spacer plates 14X to 14Z of the two manifold plates (13X and 13Y). ing. On the other hand, in the lower manifold plate 13Y located on the nozzle plate 11 side, the two ink chamber halves 13b and 13b are recessed so as to open only toward the upper manifold plate 13X. In the present embodiment, both the ink chamber halves 13a and 13b are formed by etching, and the lower half 13b is formed by half etching.
In this configuration, by stacking a total of three manifold plates 13X and 13Y and the lower spacer plate 14Z, the corresponding upper and lower ink chamber halves 13a and 13b are joined to each other, and the through hole 37 Two common ink chambers 7, 7 are formed on each side of the row, as shown in FIG. Accordingly, in the present embodiment, the two manifold plates 13X and 13Y serve as the second flat plate P of the present invention. 2 It corresponds to.
[0033]
The reason why the two common ink chambers 7 and 7 are provided on both sides of the row of through holes 37 is to correspond to the pressure chambers 36 arranged in two rows. In other words, the pressure chamber group on one side of the two rows arranged is connected to one common ink chamber 7, and the pressure chamber group on the other side is connected to the other common ink chamber 7.
By configuring the inkjet head 6 in this way, it is also possible to use it in a printing mode in which two different ink chambers 7 and 7 are supplied with different colors of ink and two inkjet printing is performed with one inkjet head 6. This makes it possible to increase the versatility of the inkjet head 6 and reduce the types of components. However, in this embodiment, the same color ink is supplied to both the common ink chambers 7 and 7 and a single-color high-resolution printing is performed by the two rows of nozzles 35.
[0034]
As shown in FIG. 5, damper grooves 12c and 12c are recessed in the damper plate 12 located immediately below the manifold plates 13X and 13Y. The damper grooves 12c and 12c are formed so as to open only toward the manifold plate 13Y, and their positions and shapes are made to coincide with the common ink chambers 7 and 7.
Accordingly, when the manifold plates 13X and 13Y and the damper plate 12 are joined, the damper groove 12c is located in a portion (damper portion 42) where the ink chamber half 13b of the manifold plate 13Y is recessed. Here, since the manifold plate 13Y is made of a metal material (for example, stainless steel) that can be elastically deformed as appropriate, the damper portion 42 freely vibrates both on the common ink chamber 7 side and on the damper groove 12c side. can do.
With the above configuration, even if the pressure fluctuation generated in the pressure chamber 36 during ink ejection propagates to the common ink chamber 7, the damper section 42 can elastically deform and vibrate, thereby absorbing and attenuating the pressure fluctuation. (Damper action), crosstalk in which pressure fluctuations propagate to other pressure chambers 36 can be prevented.
[0035]
As shown in FIG. 4, the base plate 15 is provided with two ink supply holes 39a and 39a, and the spacer plates 14X, 14Y and 14Z are similarly provided with two ink supply holes 39b to 39d. . By joining the base plate 15 and the spacer plates 14X, 14Y, and 14Z, the corresponding ink supply holes 39a to 39d are connected to each other, and the ink supply ports 39 and corresponding to the two common ink chambers 7 and 7, respectively, are connected. 39 is formed.
In order to reduce the size of the inkjet head 6, the ink supply ports 39 are formed at positions close to the ends of the rows formed by the plurality of pressure chambers 36, 36. 39 and 39 are arranged close to each other.
[0036]
With the above-described configuration of the cavity plate 10, the ink that has flowed into the common ink chambers 7 and 7 from the ink supply ports 39 and 39 described above passes through the introduction hole 44 through the throttle portion 43 → the ink supply hole 38, and is supplied to each pressure It is supplied from the other end 36 b side of the chamber 36. Then, the ink given the ejection energy by the actuator 20 to be described later in each pressure chamber 36 is ejected from the one end portion 36a to the corresponding nozzle 35 after passing through the through holes 37. .
[0037]
FIG. 8 is an exploded perspective view of the actuator 20. As shown in FIGS. 6 and 8, the actuator 20 has a structure in which two types of piezoelectric sheets 21 and 22 and a single insulating sheet 23 are laminated. On the upper surface of one piezoelectric sheet 21, a plurality of narrow drive electrodes 24 corresponding to the respective pressure chambers 36 in the cavity plate 10 are provided in a staggered arrangement. One end 24a of each drive electrode 24 is formed so as to be exposed on the left and right side surfaces orthogonal to the front and back surfaces 20a and 20b of the actuator 20.
[0038]
A common electrode 25 common to the plurality of pressure chambers 36 is provided on the upper surface of the other piezoelectric sheet 22. Similarly to the one end portion 24a of each drive electrode 24, the one end portion 25a of the common electrode 25 is also formed to be exposed on the left and right side surfaces. The piezoelectric sheets 21 and 22 are not only alternately stacked one by one as shown, but also a plurality of piezoelectric sheets can be alternately stacked. The respective regions in the piezoelectric sheets 21 and 22 sandwiched between the drive electrodes 24 and the common electrode 25 serve as pressure generating portions corresponding to the respective pressure chambers 36.
[0039]
On the upper surface of the uppermost insulating sheet 23, a surface electrode 26 for each of the drive electrodes 24 and a surface electrode 27 for the common electrode 25 are provided so as to be aligned along the left and right side surfaces.
[0040]
On the left and right sides, a first recessed groove 30 is provided at one end 24a of each drive electrode 24, and a second recessed groove 31 is provided at one end 25a of the common electrode 25 so as to extend in the stacking direction. Yes. In each first recessed groove 30, a side electrode (not shown) that electrically connects each drive electrode 24 and each surface electrode 26 is provided, and in each second recessed groove 31, the common electrode 25 and Side electrodes (not shown) that electrically connect the surface electrode 27 are formed. The electrodes 28 and 29 are discarded patterns.
[0041]
The cavity plate 10 and the actuator 20 configured as described above are stacked so that each pressure chamber 36 in the cavity plate 10 and the drive electrode 24 in the actuator 20 correspond to each other. Further, on the upper surface 20 a of the actuator 20, various wiring patterns (not shown) in the flexible flat cable 40 are electrically joined to the surface electrodes 26 and 27.
[0042]
When a voltage is applied between any drive electrode 24 and the common electrode 25 among the drive electrodes 24 of the actuator 20 in the inkjet head 6, the portion of the drive electrode 24 to which the voltage is applied in the piezoelectric sheet 22 (ie, pressure). The generation part) is distorted in the stacking direction due to piezoelectricity, and the volume of the pressure chamber 36 is reduced. In this way, ejection energy is given to the ink in the pressure chamber 36, and the ink is ejected in droplets from the nozzle 35, and predetermined printing on the paper 62 is performed.
[0043]
As described above, in the present embodiment, the flat plate (the first flat plate P) that forms the pressure chamber 36. 1 Different flat plate (third flat plate P) 3 A narrowed portion 43 serving as a restriction channel is formed in the intermediate spacer plate 14Y). The throttle portion 43 is formed long along the surface direction of the intermediate spacer plate 14Y, and from one end connected to the pressure chamber 36 via the ink supply hole 38, a plane formed by the plurality of pressure chambers 36 is formed. It is formed to extend in parallel directions.
Accordingly, when the flow paths corresponding to the respective nozzles 35 are arranged inside the ink jet head, interference between the pressure chamber 36 and the throttle portion 43 can be avoided. As a result, the ink-jet head 6 can be made compact, and the demand for higher integration based on the need for higher resolution can be easily met. Further, since the throttle portion 43 extends in a direction parallel to the plane formed by the plurality of pressure chambers 36, the increase in the flat plate stacking direction of the flow path space can be made slight.
[0044]
In particular, in the present embodiment, the path flowing from the throttle portion 43 to the pressure chamber 36 through the ink supply hole 38 has a “U” shape in side view, and the ink flowing into the throttle portion 43 is as shown in FIG. When the ink supply hole 38 reaches the pressure chamber 36, the direction is reversed and the ink flows in a folded shape.
Thus, since the pressure chamber 36 and the throttle portion 43 are arranged so as to overlap with each other in the flat plate stacking direction, the introduction hole 44 reaches the nozzle 35 via the throttle portion 43, the pressure chamber 36, and the ink supply hole 38. The ink flow path can be reasonably contained within a small width (width W shown in FIGS. 6 and 7).
[0045]
In the present embodiment, as shown in FIG. 3 The intermediate spacer plate 14 </ b> Y is formed in a penetrating manner, thereby suppressing variations in flow resistance of the throttle portion 43 and reducing variations in the amount of ink ejected from the nozzles 35.
That is, the flow path resistance of the restricting portion (restricted flow path) 43 greatly affects the flow of ink from the pressure chamber 36 toward the common ink chamber 7 during ejection as described above. It is extremely important to accurately determine the resistance in order to suppress variations in the amount of ink ejected from the nozzles 35. However, as shown in the conventional configuration of FIG. 11, the restriction channel 36d is formed in a groove shape by half-etching from one side of the flat plate 15, so that the etching rate depends on factors such as the temperature of the etchant and the degree of deterioration. It fluctuates easily, which leads to variations in groove depth. Here, since the flow path resistance of the restricted flow path 36d is inversely proportional to the cross-sectional area of the flow path (= groove depth × groove width), the variation in the groove depth is directly connected to the variation in the flow resistance, and the ink discharge This resulted in a decrease in print quality due to an excessive or insufficient amount.
On the other hand, in the present embodiment, as shown in FIG. 5 and FIG. 6, the restricting portion 43 serving as the restriction channel is formed in the intermediate spacer plate 14Y so as to penetrate in the thickness direction. The accuracy depends only on the accuracy of the thickness of the intermediate spacer plate 14Y. This means that the depth of the throttle portion 43, and thus the flow path cross-sectional area (area S shown in FIG. 7) can be accurately determined. As a result, variations in flow path resistance can be reduced, and the quality of ink jet printing can be improved. Be improved.
[0046]
The third flat plate P 3 The thickness of the intermediate spacer plate 14Y is smaller than the other flat plates. Specifically, the thickness of the intermediate spacer plate 14Y among the eight flat plates 11 to 15 constituting the cavity plate 10 is minimized. Here, as described above, since the throttle portion 43 is formed in a penetrating manner, the depth of the throttle portion 43 matches the thickness of the intermediate spacer plate 14Y. Accordingly, the depth of the throttle portion 43 is also reduced.
Here, if the depth of the throttle portion 43 is large, the flow path width must be extremely narrowed in order to obtain the flow path cross-sectional area S (= width × depth) necessary for imparting an appropriate resistance to the ink flow. Processing becomes extremely difficult. However, in the present embodiment, since the thickness of the intermediate spacer plate 14Y is small, the depth of the throttle portion 43 can be reduced, and since it is not necessary to narrow the flow path width of the throttle portion 43, the processing of the throttle portion 43 is easy.
In addition, with the above-described configuration, the narrowed portion 43 can be punched not only by etching but also by pressing. In this case, the press working is further facilitated by appropriately rounding the portion where the narrowed portion in the middle of the narrowed portion 43 and the enlarged portions at both ends are connected. In the etching process, the width of the throttle portion 43 can be manufactured with an accuracy of ± 15 μm to 20 μm, but in the press process, it can be manufactured with an accuracy of ± 5 μm.
[0047]
However, the effect of the present invention that the ink flow path can be accommodated in a compact space can be achieved even in a configuration in which the narrowed portion 43 is not formed in a penetrating shape but is formed by so-called half etching.
Hereinafter, two modified examples in which the narrowed portion 43 is formed by half etching will be described with reference to FIGS.
[0048]
In the configuration shown in FIG. 9 (Modification 1), manifold plates 13X and 13Y (second flat plate P) forming the common ink chamber 7 are used. 2 ) And intermediate spacer plate 14Y (third flat plate P) 3 Are stacked adjacent to each other without a flat plate therebetween (that is, the lower spacer plate 14Z is omitted). And the third flat plate P 3 The intermediate spacer plate 14 </ b> Y is half-etched on the surface facing the pressure chamber 36, and the elongated throttle portion 43 is recessed in a groove shape. One end of the throttle portion 43 is connected to the other end portion 36b of the pressure chamber 36 through an ink supply hole 38 formed in a penetrating manner in the upper spacer plate 14X. The other end of the restricting portion 43 is connected to the common ink chamber 7 through an introduction hole 44 formed in a penetrating manner in the intermediate spacer plate 14Y.
The configuration of the first modification can reduce the number of components because the ink flow path can be accommodated in the compact width W as described above and the lower spacer plate 14Z can be omitted.
[0049]
Further, in the configuration shown in FIG. 10 (Modification 2), the base plate 15 (the first flat plate P) forming the pressure chamber 36 is used. 1 ) And intermediate spacer plate 14Y (third flat plate P) 3 Are stacked without a flat plate therebetween (that is, the upper spacer plate 14X is omitted). And the third flat plate P 3 The intermediate spacer plate 14 </ b> Y is half-etched on the surface facing the common ink chamber 7, and the elongated diaphragm 43 is recessed in a groove shape. One end of the throttle portion 43 is connected to the other end portion 36b of the pressure chamber 36 through an ink supply hole 38 formed in a penetrating manner in the intermediate spacer plate 14Y. The other end of the throttle portion 43 is connected to the common ink chamber 7 through an introduction hole 44 formed in a penetrating manner in the lower spacer plate 14Z.
In the configuration of the second modification, similarly to the first modification, the ink flow path can be accommodated in the compact width W, and the upper spacer plate 14X can be omitted, so that the number of parts can be reduced.
[0050]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
[0051]
That is, as shown in claim 1, a plurality of nozzles for ejecting ink to the printing surface, a pressure chamber provided corresponding to each of the nozzles and connected to the nozzle, and one end of the pressure chamber at its end A restriction flow path connecting one end, a communication flow path connecting the restriction flow path and the pressure chamber, and connecting to the other end of the restriction flow path for distributing and supplying ink to the pressure chamber An inkjet head having a flat plate laminated structure having a common ink chamber, wherein the flat plate constituting the head unit includes: a first flat plate that forms the pressure chamber; and a second flat plate that forms the common ink chamber; At least a third flat plate positioned between the first flat plate and the second flat plate, and the restrictive flow path along the surface direction of the third flat plate. The pressure chamber is formed long A path extending from the connecting end in a direction parallel to a plane formed by a plurality of pressure chambers, and a path flowing from the restriction channel to the pressure chamber via the communication channel has a “U” shape in a side view. So
The ink flow path can be rationally arranged in a compact space. That is, the restriction channel and the pressure chamber are formed on separate plates, such as the restriction channel on the third plate and the pressure chamber on the first plate. Interference with the restricted flow path can be avoided. Further, since the restriction channel is formed in a direction parallel to the plane formed by the plurality of pressure chambers, the increase in the flat plate stacking direction of the arrangement space of the channel is slight. As a result, it is easy to improve the degree of integration of the ink flow paths, and it is possible to easily cope with the high density arrangement of the nozzles based on the demands for downsizing the inkjet head and increasing the resolution of the image.
Further, by forming the pressure chamber and the restriction channel on separate flat plates, it is possible to solve the problem that both of them must be processed at the same time with high accuracy as in the prior art, and the manufacturing cost can be reduced.
Further, the ink that has flowed into the restricting flow path is reversed when it reaches the pressure chamber from the communication flow path, and flows in a folded shape. In this way, the pressure chamber and the restriction channel overlap with each other in the flat plate stacking direction, so that the ink passage leading to the nozzle via the restriction channel, the pressure chamber, and the communication channel has a small width. Can reasonably fit inside.
[0052]
According to a second aspect of the present invention, the restriction channel is formed in the third flat plate so as to penetrate the fourth flat plate, and a fourth flat plate is interposed between the third flat plate and the first flat plate. Since the communication flow path connecting the restriction flow path and the pressure chamber is provided,
Since the restricting flow path is formed in the flat plate in a penetrating manner, the accuracy of the cross-sectional area of the restricting flow path can be easily improved as compared to the case where the groove is recessed. That is, in the case where the groove is recessed, the variation in the processed shape of the groove in the thickness direction leads to the variation in the cross-sectional area of the restricted flow path, and as a result, the ink ejection amount from the nozzle is excessive or too small. The print quality will be degraded. In this respect, in the present invention, since the restriction channel is formed in the flat plate so as to penetrate, the dimensional accuracy in the plate thickness direction depends only on the accuracy of the thickness of the flat plate. Therefore, it is possible to process the restricted flow path so that the cross-sectional area (flow path resistance) becomes a desired value with high accuracy, and as a result, variations in the ink ejection amount can be suppressed and print quality can be improved.
In addition, since the communication channel connecting the pressure chamber and the restriction channel is formed on the fourth plate between the third plate and the first plate, the partition wall that separates the pressure chamber and the restriction channel It becomes a rational configuration in which the connecting flow path is formed in the fourth flat plate serving as As a result, the structure of the flow path from the common ink chamber to the pressure chamber can be simplified.
[0053]
According to a third aspect of the present invention, the first flat plate and the third flat plate are laminated without using a flat plate, and the restriction channel is provided in a groove shape on the surface of the third flat plate opposite to the first flat plate. In addition, since the connecting flow path connecting the restriction flow path and the pressure chamber is provided in a penetrating manner on the third flat plate,
Since the flat plate between the third flat plate and the first flat plate can be omitted, the number of parts can be reduced, which can contribute to a reduction in manufacturing cost and manufacturing man-hour.
[0054]
According to a fourth aspect of the present invention, the restriction channel is located between the common ink chamber and the pressure chamber in the stacking direction of the flat plates, and the second flat plate and the third flat plate are stacked without using a flat plate, The restriction flow path is provided in a groove shape on the surface of the third flat plate opposite to the second flat plate, and the communication flow connecting the restriction flow path and the common ink chamber to the third flat plate. Since the road is provided in a penetrating manner,
Since the restriction channel is between the common ink chamber and the pressure chamber, the ink channel flowing through the common ink chamber → the restriction channel → the pressure chamber can be rationally arranged. Furthermore, since the flat plate between the third flat plate and the second flat plate can be omitted, the number of parts can be reduced, which can contribute to reduction in manufacturing cost and manufacturing man-hour.
[0055]
According to a fifth aspect of the present invention, a plurality of nozzles for ejecting ink to the printing surface, a pressure chamber provided corresponding to each of the nozzles and connected to the nozzle, and one end of the pressure chamber at one end. A common ink for distributing and supplying ink to the pressure chamber, connected to a restriction channel to be connected, a communication channel for connecting the restriction channel and the pressure chamber, and connected to the other end of the restriction channel And a flat plate constituting the head unit comprising: a first flat plate that forms the pressure chamber; a second flat plate that forms the common ink chamber; At least a third flat plate located between the first flat plate and the second flat plate, which forms the restricted flow path, and the restricted flow path is elongated along the surface direction of the third flat plate. Formed and penetrated in thickness direction In addition, the restriction channel has a cross-section perpendicular to the length direction of the restriction channel, and has a minimum cross-sectional area in the ink channel from the common ink chamber to the pressure chamber. Since the path flowing through the flow path to the pressure chamber has a “U” shape in side view,
The ink flow path can be rationally arranged in a compact space. That is, the restriction channel and the pressure chamber are formed on separate plates, such as the restriction channel on the third plate and the pressure chamber on the first plate. Interference with the restricted flow path can be avoided. Moreover, since the restriction | limiting channel | path is long formed along the surface direction in the 3rd flat plate, the increase in the flat plate lamination direction of the arrangement space of a flow path is also slight. As a result, it is easy to improve the degree of integration of the ink flow paths, and it is possible to easily cope with the high density arrangement of the nozzles based on the demands for downsizing the inkjet head and increasing the resolution of the image.
Further, by forming the pressure chamber and the restriction channel on separate flat plates, it is possible to solve the problem that both of them must be processed at the same time with high accuracy as in the prior art, and the manufacturing cost can be reduced.
In addition, since the restriction channel is formed in the third flat plate in a penetrating manner, the accuracy of the cross-sectional area of the restriction channel can be improved as compared with the case where the groove is recessed as in the effect of the second aspect. It can be improved easily. Since the cross-sectional area of this cross section is the smallest cross-sectional area in the ink flow path from the common ink chamber to the pressure chamber, the flow path resistance of the restriction flow path causes the common ink chamber to flow from the pressure chamber during ejection. Since the ink flow toward the head can be appropriately controlled, variations in the amount of ink ejected from the nozzles are reduced, and deterioration in print quality is avoided.
Further, the ink that has flowed into the restricting flow path is reversed when it reaches the pressure chamber from the communication flow path, and flows in a folded shape. In this way, the pressure chamber and the restriction channel overlap with each other in the flat plate stacking direction, so that the ink passage leading to the nozzle via the restriction channel, the pressure chamber, and the communication channel has a small width. Can reasonably fit inside.
[0056]
According to a sixth aspect of the present invention, the restriction channel has a smaller cross-sectional area in the middle than both ends connected to the common ink chamber and the pressure chamber.
At the same time, the flow path resistance is accurately determined at the middle portion of the restricted flow path, and at the same time, the cross-sectional area is increased at both ends, so that the connection to the common ink chamber and the pressure chamber is ensured. That is, even if there is a slight sticking misalignment between the third flat plate and the second flat plate, or even if there is a slight sticking misalignment between the third flat plate and the first flat plate, there is a gap between the common ink chamber and the restricted flow path. And the connection between the restriction flow path and the pressure chamber is reliably maintained.
[0057]
As shown in claim 7, since the third flat plate is the thinnest among the laminated flat plates constituting the inkjet head,
Since the depth of the throttle portion (equal to the thickness of the third flat plate) can be reduced, even if the width of the throttle portion is increased to some extent, the flow path resistance necessary for reducing the ink flow rate can be generated. Therefore, it becomes easy to form the throttle portion.
[0058]
The restriction flow path may be located between the common ink chamber and the pressure chamber in the stacking direction of the flat plates, and a fourth flat plate between the third flat plate and the first flat plate. A connecting flow path for connecting the restriction flow path and the pressure chamber is provided on the fourth flat plate, and a fifth flat plate is interposed between the third flat plate and the second flat plate, Since the communication channel for connecting the restriction channel and the common ink chamber is provided on the fifth flat plate,
Since the restriction channel is between the common ink chamber and the pressure chamber, the ink channel flowing through the common ink chamber → the restriction channel → the pressure chamber can be rationally arranged.
Further, a communication channel connecting the pressure chamber and the restriction channel is a fourth plate between the third plate and the first plate, and a communication channel connecting the restriction channel and the common ink chamber is the third plate. Since the fifth flat plate is formed between the flat plate and the second flat plate, the fourth and fourth plates function as a partition wall that separates the pressure chamber, the restriction channel, and the common ink chamber from each other. It becomes a rational configuration in which the communication flow path is formed in a penetrating manner on the five flat plates. As a result, the structure of the flow path from the common ink chamber to the pressure chamber can be simplified.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a color inkjet printer to which an embodiment of the present invention is applied.
FIG. 2 is a cross-sectional view of a printer head.
FIG. 3 is an exploded perspective view of the head unit.
FIG. 4 is an exploded perspective view showing a laminated structure of cavity plates.
5 is an enlarged perspective view of a VV cross section in FIG. 4. FIG.
6 is an enlarged sectional view taken along line VI-VI in FIG.
FIG. 7 is a perspective view illustrating an ink flow path from a common ink chamber to a nozzle through a throttle portion and a pressure chamber.
FIG. 8 is an exploded perspective view showing a laminated structure of actuators.
FIG. 9 is a cross-sectional view showing a first modification of the configuration of the aperture portion.
FIG. 10 is a cross-sectional view showing a second modification of the configuration of the aperture portion.
FIG. 11 is a cross-sectional view illustrating a configuration of a restriction channel of a conventional inkjet head.
[Explanation of symbols]
6 Inkjet head
7 Common ink chamber
11-15 flat plate
P 1 First flat plate (base plate 15)
P 2 Second flat plate (upper spacer plate 14X)
P 3 Third flat plate (intermediate spacer plate 14Y)
P 4 4th flat plate (lower spacer plate 14Z)
P 5 5th flat plate (manifold plates 13X and 13Y)
35 nozzles
36 Pressure chamber
38 Ink supply hole (communication flow path)
43 Restriction part (restricted flow path)
44 Introduction hole (communication flow path)

Claims (8)

  1. A plurality of nozzles that eject ink onto the printing surface;
    A pressure chamber provided corresponding to each of the nozzles and connected to the nozzle;
    A restriction channel connecting one end of the pressure chamber to one end of the pressure chamber via a communication channel ;
    Connected to the other end of this restricted flow path, an ink jet head of the flat laminated structure having a common ink chamber for supplying and distributing ink to the pressure chamber,
    The flat plate constituting the inkjet head is
    A first flat plate forming the pressure chamber;
    A second flat plate forming the common ink chamber;
    Including at least a third flat plate that is positioned between the first flat plate and the second flat plate and that forms the restricted flow path; and
    The restriction channel is formed in the third flat plate along the surface direction and extends in a direction parallel to a plane formed by a plurality of pressure chambers from one end connected to the pressure chamber,
    An inkjet head characterized in that a path flowing from the restriction channel to the pressure chamber through the communication channel has a “U” shape in a side view.
  2.   2. The inkjet head according to claim 1, wherein the restriction channel is formed in a penetrating manner in the third flat plate, and a fourth flat plate is interposed between the third flat plate and the first flat plate, An inkjet head characterized in that the communication channel for connecting the restriction channel and the pressure chamber is provided on the fourth flat plate.
  3.   2. The inkjet head according to claim 1, wherein the first flat plate and the third flat plate are stacked without a flat plate, and the restricted flow path is formed on a surface of the third flat plate opposite to the first flat plate. Is provided in a groove shape, and the communication flow path connecting the restriction flow path and the pressure chamber is provided in a penetrating shape on the third flat plate.
  4.   2. The inkjet head according to claim 1, wherein the restriction flow path is located between the common ink chamber and the pressure chamber in the stacking direction of the flat plates, and the second flat plate and the third flat plate are interposed via the flat plate. The restriction flow path is provided in a groove shape on the surface of the third flat plate opposite to the second flat plate, and the restriction flow path and the common ink chamber are provided on the third flat plate. An inkjet head, wherein the connecting flow path to be connected is provided in a penetrating manner.
  5. A plurality of nozzles that eject ink onto the printing surface;
    A pressure chamber provided corresponding to each of the nozzles and connected to the nozzle;
    A restriction channel connecting one end of the pressure chamber to one end of the pressure chamber via a communication channel ;
    Connected to the other end of this restricted flow path, an ink jet head of the flat laminated structure having a common ink chamber for supplying and distributing ink to the pressure chamber,
    The flat plate constituting the head unit is
    A first flat plate forming the pressure chamber;
    A second flat plate forming the common ink chamber;
    Including at least a third flat plate that is positioned between the first flat plate and the second flat plate and that forms the restricted flow path; and
    The restriction channel is formed in the third flat plate so as to extend along the surface direction and penetrates in the plate thickness direction,
    The restriction channel has a minimum cross-sectional area in the ink channel from the common ink chamber to the pressure chamber, the cross-section orthogonal to the length direction of the restriction channel.
    An inkjet head characterized in that a path flowing from the restriction channel to the pressure chamber through the communication channel has a “U” shape in a side view.
  6.   6. The inkjet head according to claim 5, wherein the restriction channel has a smaller cross-sectional area in the middle than both ends connected to the common ink chamber and the pressure chamber. head.
  7.   7. The ink jet head according to claim 5, wherein the third flat plate is the thinnest of the laminated flat plates constituting the ink jet head.
  8. The inkjet head according to any one of claims 5 to 7,
    The restriction channel is positioned between the common ink chamber and the pressure chamber in the stacking direction of the flat plates,
    A fourth flat plate is interposed between the third flat plate and the first flat plate, a communication flow path is provided on the fourth flat plate to connect the restriction flow path and the pressure chamber; and
    A fifth flat plate is interposed between the third flat plate and the second flat plate, and the communication flow path for connecting the restriction flow path and the common ink chamber is provided on the fifth flat plate. An inkjet head.
JP2002135506A 2002-05-10 2002-05-10 Inkjet head Active JP3979174B2 (en)

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JP2002135506A JP3979174B2 (en) 2002-05-10 2002-05-10 Inkjet head
US10/431,389 US6846069B2 (en) 2002-05-10 2003-05-08 Ink-jet head
AT03010488T AT413969T (en) 2002-05-10 2003-05-09 Ink jet head
EP03010488A EP1361063B1 (en) 2002-05-10 2003-05-09 Ink-jet head
DE60324628T DE60324628D1 (en) 2002-05-10 2003-05-09 ink-jet head

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JP4622362B2 (en) * 2004-07-26 2011-02-02 ブラザー工業株式会社 Inkjet head
JP4662027B2 (en) * 2004-12-22 2011-03-30 ブラザー工業株式会社 Ink jet head and manufacturing method thereof
JP4923809B2 (en) * 2005-07-29 2012-04-25 ブラザー工業株式会社 Inkjet printer head and inkjet printer
JP4761036B2 (en) * 2005-10-14 2011-08-31 ブラザー工業株式会社 Ink jet head and manufacturing method thereof
JP4998664B2 (en) * 2005-10-21 2012-08-15 ブラザー工業株式会社 Inkjet head
JP2007237599A (en) * 2006-03-09 2007-09-20 Brother Ind Ltd Inkjet head
US8376526B2 (en) 2006-03-09 2013-02-19 Brother Kogyo Kabushiki Kaisha Inkjet head
JP2014088034A (en) * 2008-02-26 2014-05-15 Seiko Epson Corp Liquid jet head and liquid jet device
JP2008195080A (en) * 2008-05-01 2008-08-28 Seiko Epson Corp Liquid ejection head and liquid ejection apparatus
JP2010184505A (en) * 2010-06-04 2010-08-26 Seiko Epson Corp Liquid jet head and liquid jet device
JP5267687B2 (en) * 2012-01-11 2013-08-21 セイコーエプソン株式会社 Liquid ejecting head and liquid ejecting apparatus
JP5440685B2 (en) * 2012-12-27 2014-03-12 セイコーエプソン株式会社 Liquid ejecting head and liquid ejecting apparatus
JP2014024346A (en) * 2013-11-01 2014-02-06 Seiko Epson Corp Liquid ejection head and liquid ejection device
JP5888397B2 (en) * 2014-12-18 2016-03-22 セイコーエプソン株式会社 Liquid ejector

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