JP2011156766A - Liquid jet head and liquid jet device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ink jet head structure achieving reduction in the costs of an ink jet head and reduction in a space for disposing the ink jet head in an ink jet recorder. <P>SOLUTION: The cover plate 18 of the ink jet head 1 includes a plurality of slits 19 and channels 15 or a plurality of cylindrical joints 21 set in the channels 15. This decreases the expense required to improve the printing quality and printing stability of the ink jet recorder, and reduces the space for disposing the ink jet head in the ink jet recorder. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a liquid ejecting head that discharges liquid from a nozzle to form an image, characters, or a thin film material on a recording medium, and a liquid ejecting apparatus using the same.

  In recent years, ink jet type liquid ejecting heads have been used in which ink droplets are ejected onto recording paper or the like to draw characters and figures, or liquid material is ejected onto the surface of an element substrate to form a functional thin film. In this method, ink or liquid material is supplied from a liquid tank to a liquid ejecting head via a supply pipe, and the volume of the channel filled with ink of the liquid ejecting head is changed according to a drive signal, and the nozzle communicates with the channel. Ink is ejected from the ink. When ink is ejected, a liquid ejecting head or a recording medium for recording the ejected liquid is moved to record characters and figures, or a functional thin film having a predetermined shape is formed.

  Among them, an ink jet recording apparatus that records characters and images on a recording medium using an ink jet head having a plurality of ejection holes (nozzles) for discharging ink is generally known. In an ink jet recording apparatus, a head holder is provided so that a nozzle of an ink jet head faces a recording medium. This head holder is mounted on a carriage, and there is an apparatus that scans in a direction perpendicular to the conveyance direction of the recording medium and an apparatus that fixes the head and moves only the recording medium to perform printing.

  As shown in FIG. 7, an ink cartridge 4 is installed to supply ink to the inkjet head 1, and a needle 9 having a small hole at the tip of the ink tube 3 is inserted into the ink take-out portion 52 of the ink cartridge 4 to supply ink. It has a structure. When the inkjet head 1 and the ink cartridge 4 are connected, in order to supply ink to the inkjet head 1, a pressure filling method or a suction filling method (not shown) is used to supply ink and make it ejectable. The ink jet head 1 is driven by applying an electric signal to a head chip that is a drive unit that ejects ink and is provided inside the ink jet head 1, and ink droplets are ejected from the ejection holes of the nozzle plate 11.

  In such an ink jet head 1, as shown in FIG. 11, a nozzle plate provided with ejection holes 12 for ejecting ink droplets is bonded to a head chip 10, and a nozzle cap using aluminum having good thermal conductivity is used. Adhere and fix. And it fixes to the base shape | molded with aluminum etc., the flow path used as the supply path of an ink is fixed to the head chip 10, and the circuit board which transmits an electric signal to the head chip 10 is connected with a flexible substrate etc.

JP 2009-166269 A

  However, in the ink jet head structure described in Patent Document 1, there is one ink supply portion in the flow path, and as shown in FIG. 11, the ink supply port (slit) 19 of the cover plate 18 forming the head chip 10. Therefore, only one color ink can be ejected from one inkjet head 1. Therefore, when printing Y (yellow), M (magenta), C (cyan), and B (black) with an inkjet head, four inkjet heads are required. In addition, in order to print a higher quality image, more ink than the four colors described above is required, and therefore an ink jet head corresponding to the number of inks is required. As a result, the cost of the ink jet head for the ink jet recording apparatus increases. In addition, the carriage on which the ink jet head is mounted becomes large, and the enlargement of the ink jet recording apparatus has been a problem.

  In view of such circumstances, an object of the present invention is to provide an ink jet head structure that can reduce the cost of an ink jet head and reduce an ink jet head arrangement space in an ink jet recording apparatus.

  According to a first aspect of the present invention for solving the above-described problem, an injection hole member having an injection hole for injecting a liquid, a piezoelectric member having a plurality of liquid chambers communicating with the injection hole, and a liquid communicating with the liquid chamber A liquid supply member that constitutes a liquid supply port that supplies liquid, and in which the liquid is ejected by applying a drive voltage to a drive electrode provided in the liquid chamber. The first port and the second port each include a first port and a second port that pass through from one end surface to the other end surface and are juxtaposed with each other. In the liquid ejecting head, a plurality of liquids having colors are supplied.

  In the first aspect, since the liquid supply port has the first port portion and the second port portion, two types of liquid can be discharged. That is, multi-color printing can be supplemented by a single liquid ejecting head. Further, since the number of arrangement is smaller than arranging a plurality of liquid ejecting heads side by side, the possibility of misalignment is reduced and the printing quality is improved.

  According to a second aspect of the present invention, in the first aspect, the first mouth portion and the second mouth portion are provided at positions symmetrical with respect to the center in the longitudinal direction of the liquid supply member. The liquid ejecting head is characterized in that the opening lengths in the direction in which the parts are arranged are the same.

  In the second aspect, the first mouth portion and the second mouth portion are provided at positions that are symmetrical at the center in the longitudinal direction of the liquid supply member, and the opening length in the juxtaposition direction of the first mouth portion and the second mouth portion. Therefore, the two types of liquids can be supplied to the same number of liquid chambers. Thereby, two types of liquids can be ejected by the same number of liquid chambers.

  According to a third aspect of the present invention, in the first or second aspect, the central portion of the liquid supply member in the juxtaposition direction of the first mouth portion and the second mouth portion is disposed in the central portion of the piezoelectric member in the juxtaposition direction of the liquid chamber. The liquid jet head is characterized in that a liquid chamber is provided in the center of the piezoelectric member so as to face each other.

  In the third aspect, the liquid supply member central portion faces the piezoelectric member central portion, and a liquid chamber is formed in the piezoelectric member central portion. Accordingly, the liquid chambers corresponding to the first mouth portion and the second mouth portion can be continuously processed with the conventional structure, so that the manufacturing cost can be reduced.

  According to a fourth aspect of the present invention, in the first or second aspect, the central portion of the liquid supply member in the juxtaposition direction of the first mouth portion and the second mouth portion is disposed in the central portion of the piezoelectric member in the juxtaposition direction of the liquid chamber. The liquid ejecting head is characterized in that the piezoelectric member and the liquid supply member are bonded to each other without providing a liquid chamber in the central portion of the piezoelectric member.

  In the fourth aspect, the liquid supply member central portion faces the piezoelectric member central portion, the liquid chamber is constituted by the first liquid chamber system and the second liquid chamber system, and the liquid chamber is not provided in the piezoelectric member central portion. The piezoelectric member and the liquid supply member are joined. Thereby, the piezoelectric member and the liquid supply member can be firmly fixed.

  According to a fifth aspect of the present invention, in any of the first to fourth aspects, the fifth aspect has a plurality of pressure buffering chambers that communicate with each of the first port and the second port and buffer pressure fluctuations that occur in the liquid. A liquid ejecting head including a pressure buffer is provided.

  In the fifth aspect, stable liquid ejection can be performed by reducing pressure fluctuations that occur when the liquid is supplied to each of the first mouth and the second mouth or when the liquid is ejected. it can.

  A sixth aspect of the present invention is the liquid ejecting head according to the fifth aspect, wherein a plurality of pressure buffering chambers are provided in a single pressure buffer.

  In the sixth aspect, similarly to the second aspect, a plurality of pressure shock absorbers can be integrally formed, and a plurality of pressure buffer chambers can be integrally formed with a plurality of pressure buffer chambers provided at a lower cost. Further, it is possible to reduce the film crimping surface that does not have a pressure buffering function. Therefore, since the surface area and volume of the pressure buffer portion can be increased, the pressure during discharge can be further reduced.

  According to a seventh aspect of the present invention, there is provided a liquid ejecting head including a temperature sensor that measures the temperature of the liquid in the vicinity of the liquid supply member.

  In the seventh aspect, in any one of the first to sixth aspects, temperature management can be performed by providing a temperature sensor that measures the temperature of the liquid in the vicinity of each of the mouth portions, and the discharge performance, discharge stability, Printing quality can be improved.

  According to an eighth aspect of the present invention, in any one of the first to seventh aspects, the liquid ejecting head described above, the liquid is stored, the first mouth portion and the second mouth are disposed via the flow path tube and the liquid supply device. And a liquid supply system that supplies a liquid to the unit.

  The eighth aspect includes the above-described liquid ejecting head described in any one of the first to seventh aspects, the liquid is stored, the flow path tube and the liquid supply device, and the first port and the second port. According to the present invention, the first liquid is supplied to the liquid supply system, so that the liquid can be supplied to the liquid ejecting head.

  According to the features of the present invention, a liquid ejecting head structure that can reduce the cost of the liquid ejecting head and reduce the space for arranging the liquid ejecting head in the liquid ejecting apparatus can be achieved.

1 is a perspective view of a liquid ejecting apparatus according to an embodiment of the invention. FIG. 3 is an exploded view of the liquid jet head according to the embodiment of the invention. It is an exploded view of the head chip concerning the embodiment of the present invention. FIG. 3 is a perspective view of a liquid ejecting head according to an embodiment of the invention. It is an exploded view of the liquid supply system which concerns on embodiment of this invention. It is an exploded view of the liquid supply system which concerns on flow-path embodiment of this invention. 1 is a schematic view of a liquid ejecting apparatus according to an embodiment of the present invention. It is a head chip exploded view concerning an embodiment of the present invention. 1 is a schematic configuration diagram of a liquid jet head according to an embodiment of the present invention. It is an exploded view of the head chip in the Example of the present invention. It is sectional drawing of the head chip which concerns on embodiment of this invention. It is channel explanatory drawing which concerns on embodiment of this invention.

(First embodiment)
FIG. 3 is an exploded view of the head chip 10, and FIG. 4 is an overall view of the ink jet head 1 (liquid ejecting head).

  The head chip 10 shown in FIGS. 3 and 8 is configured by bonding a chip 20 (piezoelectric member) and a cover plate 18 (liquid supply member). The chamber 20 described later is formed in the chip 20 of FIG. 3, and ink (liquid) is ejected from the ejection holes 12. Also, the cover plate 18 is provided with two slits 19 (liquid supply ports) penetrating from one end surface to the other end surface (first port portion 19a and second port portion 19b), so that a plurality of inks having different liquid colors are provided. Can be supplied to the chamber 28 of the chip 20 and can be discharged. The chip 20 includes a first chip 20a and a second chip 20b. The first chip 20a and the second chip 20b have the same length in the X direction, and the same number of chambers 28 are formed. The first head portion 19a and the first chip 20a constitute a first head chip, and the second mouth portion 19b and the second chip 20b constitute a second head chip.

  More specifically, the first port portion 19 a and the second port portion 19 b are opened over the plurality of chambers 28, respectively, and ink can be supplied to the plurality of chambers 28. Note that the slit 19 is not opened in the central portion 60 a of the cover plate 18. Thus, the ink is not supplied to the chamber 28 corresponding to the central portion 60b of the chip 20. In addition, surplus adhesive flows into the chamber 28 corresponding to the central portion 60b to which ink is not supplied, when the chip 20 and the cover plate 18 are joined. With this configuration, the chamber 28 corresponding to the first port portion 19a and the second port portion 19b can be continuously processed with the conventional structure, so that the manufacturing cost can be reduced.

  In the first place, the chamber 28 may be configured not to be formed at a position corresponding to the central portion 60b. With this configuration, stronger adhesion can be realized.

  Moreover, the 1st opening part 19a and the 2nd opening part 19b are provided in the position which becomes symmetrical in the longitudinal direction center of a cover plate. Further, since the opening lengths of the first port portion 19a and the second port portion 19b are the same, ink can be supplied to the same number of chambers 28 by the first port portion 19a and the second port portion 19b.

More specifically, the bonding of the chip 20 and the cover plate 18 will be described. The chip 20 and the cover plate 18 are bonded to each other by applying an adhesive to the opposing surfaces. As described above, the chamber 20 is formed in the chip 20, and the cover plate 18 is bonded so as to close the area other than the slit 19. An epoxy adhesive or the like is used as the adhesive material. If the amount of the adhesive is small, it cannot be sufficiently bonded, and the chip 20 and the cover plate 18 may be peeled off. Therefore, the adhesive is bonded with a sufficient amount of the adhesive.
As described above, the chamber 28 is not formed at a position corresponding to the central portion 60b, and the substantially flat central portion 60b of the chip 20 and the cover plate central portion 60a can be bonded. By this, since it becomes joining with a plane, a strong adhesion | attachment can be implemented.

  Then, the bonding is performed according to the dotted line in FIG. More specifically, the length in the X direction, which is the longitudinal direction of the chip 20 and the cover plate 18, is approximately the same length, and the length in the Y direction, which is the short direction, is greater in the chip 20. It is formed longer than the cover plate 18. Then, the lower ends of the drawings in the Y direction are flush with each other, and the chips 20 at the upper ends of the drawings in the Y direction are left slightly pasted together. In the remaining portion of the chip 20, that is, the portion where the cover plate 18 is not attached, a lead electrode (not shown) drawn from an electrode described later is formed. A circuit board 16 to be described later supplies a drive signal to the electrodes via the extraction electrodes.

  Further, the mode of supplying ink to the first port portion 19a and the second port portion 19b will be described. The flow path 15 shown in FIG. 4 is partitioned at the center portion in the same manner as the slits 19a and 19b of the cover plate 18, A columnar joint portion 21 is provided for the ink to flow into each of the partitioned flow paths 15, which are bonded to the first mouth portion 19 a and the second mouth portion 19 b with an adhesive (not shown). The cylindrical joint portion 21 is provided with a damper 22 (pressure buffer), and supplies a plurality of inks having different liquid colors through tubes (not shown). The damper 22 is provided with two damper chambers (pressure buffer chambers) (not shown) that buffer ink pressure fluctuations, and each of the two damper chambers has a first opening 19a and a second opening 19b, respectively. Communicating with In this way, by supplying ink to the first port portion 19a and the second port portion 19b, the chambers 28 of the first chip 20a and the second chip 20b are passed through the first port portion 19a and the second port portion 19b. Fill with ink. Although specifically described later in the filling method, suction filling may be performed by mounting a maintenance device (not shown) on the ink jet recording apparatus and providing a suction member at a position facing the head chip 10. A pressure pump may be provided between the ink cartridge and the head chip 10 to perform pressure filling.

  In the present embodiment, the pressure buffer chamber is configured as a pressure chamber communicating with each of the first port portion and the second port portion as a separate member, but a configuration in which a pressure buffer corresponding to each pressure buffer chamber is provided. Adopted. Instead of this, a configuration in which a plurality of pressure buffer chambers are provided in a single pressure buffer may be adopted. Thereby, it can provide more cheaply by carrying out integral molding of a some pressure buffer, and the film crimping surface which does not have a pressure buffer function can be decreased. Therefore, since the surface area and volume of the pressure buffer portion can be increased, the pressure during discharge can be further reduced.

  Next, in order to explain the overall configuration of the present invention, FIG. 1 shows a schematic diagram of an ink jet recording apparatus 25 (liquid ejecting apparatus). An ink jet recording apparatus 25 shown in FIG. 1 includes a plurality of ink jet heads 1 provided for each color, a carriage 2 in which a plurality of ink jet heads 1 are arranged in parallel in the main scanning direction, and ink composed of a flexible tube. And an ink cartridge 4 for supplying ink via a tube 3 (channel tube). The carriage 2 is mounted on a pair of guide rails 5a and 5b so as to be movable in the axial direction. Further, a drive motor 6 is provided on one end side of the guide rails 5a and 5b, and the driving force by the drive motor 6 is a pulley connected to the drive motor 6 and the other end side of the guide rails 5a and 5b. The belt is moved along a timing belt that is stretched between pulleys provided on the belt.

  A pair of transport rollers 7 and 8 are provided along the guide rails 5a and 5b on both end sides in the direction orthogonal to the transport direction of the carriage 2, respectively. These transport rollers 7 and 8 transport the recording medium S below the carriage 2 in a direction perpendicular to the transport direction of the carriage 2.

  The inkjet head 1 according to the present embodiment ejects multicolor inks. In the present embodiment, Y (yellow), M (magenta), C (cyan), and B (black) are supported. The two are mounted side by side on the carriage 2.

  In addition, four ink cartridges 4 serving as ink storage means are provided because four ink jet heads can eject four colors. Such an ink cartridge 4 ejects ink from the inkjet head 1 at a position that does not interfere with the movement of the carriage 2 in the main scanning direction and the movement of the recording medium S and applies a negative pressure to the inkjet head 1. It is provided at a position lower by a predetermined amount than the surface.

  Although not shown, the ink jet recording apparatus described above is provided with ink filling means (liquid supply device) used for a so-called cleaning operation for sucking or pressurizing ink from the ink ejection surface. Then, ink is supplied from the ink cartridge to the ink jet head by sucking or pressurizing and filling the ink from the ink discharge surface side at a predetermined timing by such ink filling means, and the ink enters the head chip. The ink that has entered passes through the ejection holes by the pump action of the head chip and lands on the print medium. Ink is continuously supplied by the negative pressure during the pump action. In this embodiment, the ink jet recording apparatus 25 having the four color ink cartridges 4 is described as an example. However, the present invention is not limited thereto, and the ink jet recording apparatus having the five to eight color ink cartridges 4 is mounted. 25 may be sufficient. The ink tube 3 and the ink filling means are used as a liquid supply system for supplying ink.

  Next, the inkjet head 1 in this embodiment is shown. As shown in FIG. 2, the inkjet head 1 of the present embodiment includes a head chip 10, a base 14 provided on one side of the head chip 10, and a flow path 15 provided on the other side of the head chip 10. And a circuit board 16 on which a drive circuit 26 for driving the head chip 10 is mounted. The shape of the flow path 15 will be described. As shown in FIG. 5, the flow path 15 is configured so that the inlet base 23 a is integrated and the inlet cover 24 a is covered, so that the time required for positioning is accurate when bonding to the head chip 10. Can be reduced. As a result, the effect of reducing the size and weight can be obtained.

  In such an ink jet head 1, as shown in FIG. 2, a nozzle plate 11 (ejection hole member) provided with ejection holes 12 for ejecting ink droplets is bonded to the head chip 10, and aluminum having good thermal conductivity is used. The nozzle cap 13 using is adhered and fixed. And it fixed to the base 14 shape | molded with aluminum etc., the flow path 15 used as the ink supply path was fixed to the head chip 10, and the circuit board 16 which transmits an electrical signal to the head chip 10 was connected by the flexible substrate 17 etc. It is a structure.

  First, the head chip 10 will be described in detail. As shown in FIGS. 2, 3, and 8, the head chip 10 is provided with a plurality of chambers 28 (liquid chambers) that communicate with the ejection holes 12 and eject ink, and each chamber 28 has a side wall 29. It is separated. The chip 20 is composed of a piezoelectric member such as lead zirconate titanate.

  One end portion in the longitudinal direction of each chamber 28 extends to one end surface of the head chip 10, and the other end portion does not extend to the other end surface, and the depth gradually decreases. Each chamber 28 is formed by, for example, a disk-shaped die cutter, and a portion where the depth gradually decreases is formed using the shape of the die cutter.

  In addition, a pair of individual electrodes 30 (drive electrodes) to which an independent drive signal is output for each chamber 28 are formed on the opening side surfaces of the side walls 29 on both sides in each chamber 28 in the longitudinal direction. Yes. The pair of individual electrodes 30 is formed on each side wall 29 in each chamber 28, for example, by vapor deposition from a known oblique direction.

  Further, the cover plate 18 is joined to the opening side of the chamber 28 of the head chip 10. The cover plate 18 is provided with an ink chamber 32 serving as a recess communicating with only the shallower other end portion of each chamber 28, and a slit 19 penetrating from the bottom of the ink chamber 32 in the direction opposite to the chamber 28. It has been.

  Here, in this embodiment, each chamber 28 is divided into groups corresponding to black (B), yellow (Y), magenta (M), and cyan (C) inks. Two 19 are provided.

  The cover plate 18 can be formed of, for example, a ceramic plate, a metal plate, or the like, but it is preferable to use a ceramic plate having an approximate thermal expansion coefficient in consideration of deformation after bonding with the chip 20.

  In addition, the nozzle plate 11 is joined to the end surface of the chip 20 and the joined body of the cover plate 18 where the chamber 28 is open. An injection hole 12 is formed at a position facing each chamber 28 of the nozzle plate 11.

  Furthermore, the nozzle plate 11 is larger than the area of the end surface where the chamber 28 of the joined body of the chip 20 and the cover plate 18 is opened. The nozzle plate 11 is formed by forming injection holes 12 in a polyimide film or the like using, for example, an excimer laser device. Although not shown, a water repellent film having water repellency is provided on the surface of the nozzle plate 11 facing the substrate to prevent ink adhesion.

  In the present embodiment, the nozzle cap 13 is disposed around the end portion where the chamber 28 of the joined body of the chip 20 and the cover plate 18 is opened. The nozzle cap 13 is joined to the outside of the joined body end face of the nozzle plate 11 to stably hold the nozzle plate 11.

  Here, the inkjet head 1 will be described in detail.

  As shown in FIGS. 2, 3, and 8, the inkjet head 1 is connected to a pair of individual electrodes 30 via, for example, bonding wires or the like at the end of the head chip 10 opposite to the ejection hole 12 side. A wiring pattern (not shown) is formed.

  Further, an aluminum base 14 on the chip 20 side and a flow path 15 on the cover plate 18 side are assembled on the rear end side of the nozzle cap 13 of the joined body of the chip 20 and the cover plate 18. As shown in FIG. 12, an ink introduction path 36 that communicates with each of the slits 19 of the nozzle cap 13 is provided in the flow path 15.

  A circuit board 16 is fixed on the base 14 protruding to the rear end side of the chip 20. A drive circuit 26 having a drive IC for driving the head chip 10 is mounted on the circuit board 16, and the drive circuit 26 and the flexible board 17 are connected. Thereby, the inkjet head 1 of FIG. 2 is completed.

  Here, driving means for outputting a driving signal to a pair of individual electrodes 30 provided on the side walls 29 in each chamber 28 will be described as a driving circuit 26. FIG. 9 is a schematic diagram showing a connection state of wiring between the drive circuit and the head chip.

  As shown in FIG. 9, an external power source and an external circuit 35 including an external signal such as a print signal are connected to the drive circuit 26 via an external wiring 51. As a result, an external signal is output from the external circuit 35 to the drive circuit 26 via the external wiring 51.

  The drive circuit 26 is connected to a pair of individual electrodes 30 provided on a side wall 29 in each chamber 28 via the flexible substrate 17. Thus, the external signal input to the drive circuit 26 is output as a drive signal to the pair of individual electrodes 30 in each chamber 28. Ink is ejected from the ejection holes 12 by applying these drive signals.

  In this embodiment, the polarization direction of the head chip 10 that forms the side wall 29 of each chamber 28 is the same as the direction in which each side wall 29 protrudes from the bottom of the chamber 28 toward the nozzle cap 13 side.

(Second Embodiment)
FIG. 6 is a perspective view of the flow path member 15b according to the second embodiment of the present invention.

  As shown in FIG. 6, since the flow path 15b is provided with the inlet base 23b and the inlet cover 24b, the flow path used in the past can be diverted, and the work content is less expensive and does not change. . Moreover, since the inlet base is also separated, the possibility of ink color mixing can be reduced.

(Third embodiment)
FIG. 10 is a perspective view of a head chip 10b according to Example 10 of the present invention.

As shown in FIG. 10, the first chip 20c and the second chip 20d in the chip 20 are configured as separate members. Corresponding to the configuration of the chip 20, the cover plate 18 also includes the first cover plate 18c and the second cover plate 18d as separate members, and the first head chip, The second chip 20d and the second cover plate 18d constitute a second head chip. By doing in this way, it becomes a form which the head chip has isolate | separated completely, and can prevent color mixing of an ink reliably. As shown in the figure, the first mouth portion 19c and the second mouth portion 19d are also configured separately.
Further, according to this configuration, the first head chip formed by the first chip 20c and the first cover plate 18c and the second head chip formed by the second chip 20d and the second cover plate 18d are individually manufactured. Can do. Therefore, it can be manufactured by a chip production process (process for forming a chamber on a chip) and a chip bonding process (process for bonding a chip and a cover plate), which are manufacturing processes similar to the conventional one.

  In the present embodiment, both the chip 20 and the cover plate 18 are configured as separate members, and the first head chip and the second head chip are configured by sticking each other. However, the present invention is not limited to this configuration. Absent. That is, only the chip 20 may be configured as a separate member, and the cover plate 18 may be configured as a single member. Similarly, only the cover plate 18 may be configured as a separate member and the chip 20 may be configured as a single member. I do not care.

  In the first to third embodiments, a temperature sensor that measures the temperature of the ink may be provided in the vicinity of the cover plate.

DESCRIPTION OF SYMBOLS 1 Inkjet head 2 Carriage 3 Ink tube 4 Ink cartridge 5 Guide rail 6 Motor 7 Carrying roller 8 Carrying roller 9 Needle 10 Head chip 11 Nozzle plate 12 Injection hole 13 Nozzle cap 14 Base 15 Channel 16 Circuit board 17 Flexible board 18a Cover plate 18b Cover plate (separated state)
19a slit 19b slit (separated state)
20a chip 20b chip (separated state)
21 cylindrical joint portion 22 damper 23 inlet base 24 inlet cover 25 inkjet recording device 26 drive circuit 28 chamber 29 side wall 30 individual electrode 31 nozzle cap 32 ink chamber 36 ink introduction path 50 external circuit 51 external wiring 52 ink take-out portion

Claims (8)

Liquid supply constituting an injection hole member having an injection hole for injecting liquid, a piezoelectric member having a plurality of liquid chambers communicating with the injection hole, and a liquid supply port communicating with the liquid chamber and supplying the liquid A liquid ejecting head that ejects the liquid by applying a driving voltage to a driving electrode provided in the liquid chamber.
The liquid supply port includes a first port portion and a second port portion that penetrate from one end surface to the other end surface of the liquid supply member and are arranged in parallel to each other, and the first port portion and the second port portion are respectively A liquid ejecting head, wherein a plurality of liquids that are open over a plurality of liquid chambers and have different liquid colors are supplied.   The first mouth portion and the second mouth portion are provided at positions symmetrical with respect to the center in the longitudinal direction of the liquid supply member, and the opening length in the juxtaposition direction of the first mouth portion and the second mouth portion is The liquid ejecting head according to claim 1, wherein the liquid ejecting head is the same.   The liquid supply member central portion in the juxtaposition direction of the first port and the second port portion faces the central portion of the piezoelectric member in the juxtaposition direction of the liquid chamber, and the liquid chamber is provided in the central portion of the piezoelectric member. The liquid jet head according to claim 1, wherein:   The central portion of the liquid supply member in the juxtaposition direction of the first mouth and the second mouth portion faces the central portion of the piezoelectric member in the juxtaposition direction of the liquid chamber, and the liquid chamber is not provided in the central portion of the piezoelectric member. The liquid jet head according to claim 1, wherein the piezoelectric member and the liquid supply member are joined to each other.   5. A pressure buffer having a plurality of pressure buffering chambers communicating with each of the first port and the second port and buffering pressure fluctuations generated in the liquid is provided. The liquid jet head according to any one of the above.   The liquid ejecting head according to claim 5, wherein the plurality of pressure buffering chambers are provided in a single pressure buffer.   The liquid ejecting head according to claim 1, wherein a temperature sensor that measures the temperature of the liquid is provided in the vicinity of the liquid supply member. A liquid ejecting head according to claim 1;
A liquid ejecting apparatus comprising: a liquid supply system that stores the liquid and supplies the liquid to the first port and the second port through a flow path tube and a liquid supply device.