JP2015054442A - Liquid discharge head and image formation apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in which when a damper chamber is formed on a flow passage plate, the flow passage plate decreases in rigidity and becomes easy to deform by plane polishing processing in component molding and pressure bonding in assembly.SOLUTION: A liquid discharge head includes a nozzle plate 1 where a plurality of nozzles 4 discharging droplets are formed, a flow passage plate 2 which forms a plurality of individual liquid chambers 6 that the nozzles 4 communicate with, and a common liquid chamber member 20 which forms a common liquid chamber 10 supplying liquid to the plurality of individual liquid chambers 6. A part of a wall surface of the common liquid chamber 10 is a deformable damper region 31, a damper chamber 32 corresponding to the damper region 31 is formed on the flow passage plate 2, and a projection part 33 is formed on the side of a junction surface of the flow passage plate 2 for the nozzle plate 1 at a position corresponding to the damper chamber 32.

Description

  The present invention relates to a liquid discharge head and an image forming apparatus.

  As an image forming apparatus such as a printer, a facsimile, a copying machine, a plotter, or a complex machine of these, for example, a liquid discharge recording type image forming using a recording head composed of a liquid discharge head (droplet discharge head) that discharges ink droplets. Devices such as ink jet recording devices are known.

  In the liquid discharge head, when the liquid in the individual liquid chamber is pressurized and droplet discharge is performed, the pressure wave generated by the pressure propagates to the common liquid chamber that supplies the liquid to the plurality of individual liquid chambers, and again from the common liquid chamber. Return to the individual liquid chamber or propagate to another individual liquid chamber. As a result, there arises a problem that the droplet discharge characteristics fluctuate or the liquid dripping occurs from a nozzle that does not discharge.

  Therefore, there is known a deformable damper region formed on the wall surface of the common liquid chamber, and a damper chamber (air chamber) formed on the back side of the damper region with a flow path plate (Patent Document 1, etc.).

JP-A-9-141856

  As described above, when the damper chamber is formed in the flow path plate, the rigidity of the flow path plate is lowered, and it is easily deformed by the surface polishing process at the time of component molding or the pressure bonding at the time of assembly. If a bent portion is generated due to the deformation of the flow path plate, the adhesive may flow into the bent portion when the adhesive is bonded to the nozzle plate.

  If the adhesive enters excessively between the flow path plate and the nozzle plate, the vibration generated by the drive of the pressure generating means will not be attenuated by the nozzle plate, but residual vibration will occur, affecting the discharge of the next droplet. As a result, there is a problem that the droplet ejection characteristics fluctuate and ejection abnormalities occur.

  The present invention has been made in view of the above points, and an object thereof is to suppress fluctuations in droplet discharge characteristics.

In order to solve the above-described problem, a liquid discharge head according to the present invention includes:
A nozzle plate formed with a plurality of nozzles for discharging droplets;
A flow path plate forming a plurality of individual liquid chambers through which the nozzle communicates;
A common liquid chamber member that forms a common liquid chamber that shares a liquid with the plurality of individual liquid chambers, and
A part of the wall surface of the common liquid chamber is a deformable damper region;
A damper chamber corresponding to the damper region is formed in the flow path plate,
On the side of the flow path plate where the nozzle plate is joined, a convex portion is formed at a portion corresponding to the damper chamber.

  According to the present invention, it is possible to suppress fluctuations in droplet discharge characteristics.

FIG. 3 is an exploded perspective view of the liquid discharge head according to the first embodiment of the present invention. It is the plane explanatory view which looked at each member of the head from the nozzle side. It is a plane explanatory view which looked at each member of the head from the piezoelectric actuator side. It is a cross-sectional explanatory drawing in the direction orthogonal to the nozzle arrangement direction before joining the nozzle plate for description of the structure regarding the damper in the embodiment to a flow-path board. Similarly, it is a cross-sectional explanatory diagram in a direction orthogonal to the nozzle arrangement direction in a state where the nozzle plate is joined to the flow path plate. It is sectional explanatory drawing in the direction orthogonal to the nozzle arrangement direction of the state which joined the nozzle plate used for description of a comparative example to the flow-path board. FIG. 6 is an exploded perspective view of a liquid discharge head according to a second embodiment of the present invention. It is the plane explanatory view which looked at each member of the head from the nozzle side. It is a plane explanatory view which looked at each member of the head from the piezoelectric actuator side. It is a cross-sectional explanatory drawing in the direction orthogonal to the nozzle arrangement direction before joining the nozzle plate for description of the structure regarding the damper in the embodiment to a flow-path board. Similarly, it is a cross-sectional explanatory diagram in a direction orthogonal to the nozzle arrangement direction in a state where the nozzle plate is joined to the flow path plate. It is explanatory drawing of the shearing-type part with which it uses for description of the general press apparatus used for manufacture of the flow-path board in this invention. It is explanatory drawing with which it uses for description of the manufacturing process (1st process) of a flow-path board. It is explanatory drawing similarly used for description of the manufacturing process (2nd process) of a flow-path board. FIG. 3 is a side explanatory view illustrating a mechanism unit of an example of an image forming apparatus according to the present invention. It is principal part plane explanatory drawing of the mechanism part.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. A liquid discharge head according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an exploded perspective view of the head, FIG. 2 is a plan view of each member of the head seen from the nozzle side, and FIG. 3 is a plan view of each member of the head seen from the piezoelectric actuator side.

  In the liquid discharge head, a nozzle plate 1, a flow path plate (flow path forming member) 2, and a vibration plate member 3 are stacked and bonded with an adhesive. And the piezoelectric actuator 11 as a pressure generation means to displace the diaphragm member 3 and the frame member 20 as a common liquid chamber member are provided.

  A plurality of nozzles 4 for discharging droplets are arranged on the nozzle plate 1. The nozzle plate 1 is formed by Ni electroforming, but is not limited thereto. For example, a stainless steel press process, a resin such as a polyimide resin film, silicon, or a combination thereof can be used. Further, a liquid repellent film is formed on the nozzle surface by a known method such as a plating film or a water repellent coating. The nozzle plate 1 is bonded to the flow path plate 2 with an adhesive.

  The flow path plate 2 forms an individual liquid chamber 6 that communicates with the nozzle 4, a fluid resistance portion 7 that serves as a liquid supply path for supplying liquid to the individual liquid chamber 6, and a liquid introduction portion 8 on the upstream side of the fluid resistance portion 7. Yes. The flow path plate 2 is formed by press working using, for example, stainless steel (SUS304 or the like).

  The diaphragm member 3 has a vibration region 3 a that can displace a part of the wall surface of the individual liquid chamber 6. The diaphragm member 3 is formed with an opening 9 that faces the common liquid chamber 10 and passes through the common liquid chamber 10 and the liquid introduction portion 8 that is the inlet side of each individual liquid chamber 6. The diaphragm member 3 has a two-layer structure and is formed by Ni electroforming.

  A common liquid chamber member 20 is bonded to the opposite side of the diaphragm member 3 from the individual liquid chamber 6.

  In addition, a piezoelectric actuator 11 is arranged on the vibration member 3 on the side opposite to the individual liquid chamber 6 in the vibration region 3a. The piezoelectric actuator 11 is joined to a piezoelectric member 12 in which a columnar piezoelectric element (piezoelectric column) is formed on a base member 13. Each piezoelectric column of the piezoelectric member 12 is joined to the island-shaped convex portion 3b formed in the vibration region 3a of the diaphragm member 3, and a drive signal is given through the FPC 16 which is a wiring member.

  The piezoelectric member 12 is bonded and fixed to the base member 13 to form grooves that are not divided by groove processing (slit processing), thereby forming a plurality of piezoelectric columns 12A that are columnar piezoelectric elements. Further, as the piezoelectric member 12, zirconate titanate (PZT) having a thickness of 10 to 50 μm / layer and internal electrodes made of silver / palladium (AgPd) having a thickness of several μm / layer were alternately stacked. A laminated piezoelectric member is used.

  The piezoelectric actuator 11 is inserted and disposed in an actuator insertion hole 21 provided in the common liquid chamber member 20.

  The common liquid chamber member 20 is formed with a common liquid chamber 10 for supplying a liquid to each individual liquid chamber 6. A liquid supply port 22 for supplying a liquid from the outside to the common liquid chamber 10 is formed.

  In this liquid ejection head, for example, the voltage applied to the piezoelectric column 12A is lowered from the reference potential, the piezoelectric column 12A contracts, the vibration region 3a of the diaphragm member 3 deforms, and the volume of the individual liquid chamber 6 expands. Then, the liquid (ink) flows into the individual liquid chamber 6, and then the voltage applied to the piezoelectric column 12A is increased to extend the drive column 12A in the stacking direction, and the vibration region 3a is deformed in the nozzle 4 direction to separate the individual liquid. By pressurizing the ink in the chamber 6, ink droplets are ejected from the nozzle 4.

  Then, by returning the voltage applied to the piezoelectric column 12A to the reference potential, the vibration region 3a is restored to the initial position, and the individual liquid chamber 6 expands to generate a negative pressure. The liquid chamber 6 is filled with ink. Therefore, after the vibration of the meniscus surface of the nozzle 4 is attenuated and stabilized, the operation proceeds to the next droplet discharge.

  Note that the driving method of the head is not limited to the above example (drawing-pushing), and striking or pushing can be performed depending on the direction of the drive waveform.

  Next, a configuration related to the damper in this embodiment will be described with reference to FIGS. 4 is a cross-sectional explanatory view in a direction orthogonal to the nozzle arrangement direction before the nozzle plate is joined to the flow path plate, and FIG. FIG.

  A part of the wall surface of the common liquid chamber 10 is a deformable damper region 31 formed by a part of the layer of the diaphragm member 3. In the flow path plate 2, a damper chamber 32 is formed corresponding to the damper region 31, that is, on the opposite side of the common liquid chamber 10 across the damper region 31.

  Further, the flow path plate 2 is formed with a convex portion 33 at a portion corresponding to the damper chamber 32 on the joint surface side with the nozzle plate 1. In addition, although the formation area of the convex part 33 is made into the area | region corresponding to the whole area | region of the damper chamber 32, it is not restricted to this. As long as the deformation or the like of the flow path plate 2 can be prevented, the flow path plate 2 can be formed narrower than the formation region of the damper chamber 32 or divided into a plurality of parts.

  Here, a comparative example will be described with reference to FIG. FIG. 6 is a cross-sectional explanatory diagram in a direction orthogonal to the nozzle arrangement direction in a state where the nozzle plate of the comparative example is joined to the flow path plate.

  In this comparative example, the convex portion 33 of the first embodiment is not formed on the flow path plate 2.

  Therefore, the portion of the flow path plate 2 where the damper chamber 32 is formed becomes thin and the rigidity is reduced. In order to suppress variations in discharge characteristics, the flatness of the flow path plate 2 is increased, and in order to increase the bonding force between the nozzle plate 1 and the flow path plate 2, a surface polishing process at the time of component molding or a pressure applied during assembly is applied. When the height is increased, the flow path plate 2 is deformed and the bent portion 41 is generated.

  When the bent portion 41 is generated in the flow path plate 2, when the nozzle plate 1 is joined, a space is formed between the nozzle plate 1 and the bent portion 41, and therefore, between the nozzle plate 1 and the flow path plate 2. The adhesive 40 enters excessively. At the time of joining with the nozzle plate 1, the bottom portion of the damper chamber 32 where the bending occurs is not directly pressurized, so that the adhesive 40 that has entered between the nozzle plate 1 and the bending portion 41 is not easily cured by pressure. Therefore, when the adhesive 40 enters excessively, the vibration of the piezoelectric actuator 11 driven at the time of droplet discharge remains as a residual vibration without being attenuated by the nozzle plate 1, which affects the discharge of the next droplet, This will cause abnormal discharge.

  On the other hand, in this embodiment, since the convex part 33 is formed in the part corresponding to the damper chamber 32 in the flow-path plate 2, the flatness of the flow-path board 2 is improved, or the nozzle plate 1 and the flow-path board In order to increase the bonding force of 2, the flow path plate 2 is not deformed even if the applied pressure is increased at the time of surface polishing or assembling during component molding.

  Therefore, as shown in FIG. 5, there is no space for the adhesive to enter when the nozzle plate 1 and the flow path plate 2 are joined, and excess adhesive is interposed between the nozzle plate 1 and the flow path plate 2. Nothing will happen. Furthermore, since the pressure is applied while the convex portion 33 and the nozzle plate 1 are in contact with the nozzle plate 1, the bottom of the damper chamber 32 is bonded to the nozzle plate 1 with sufficient strength. In this case, the convex portion 33 is formed before joining, but when the nozzle plate 1 and the flow path plate 2 are joined, pressure is applied as shown in FIG. Follow the height of the surface.

  In addition, it is preferable that the height of the convex part 33 shall be 1/2 or less of the thickness a (FIG. 4) of the flow-path board 2. FIG.

  Thereby, the thickness of the adhesive layer between the nozzle plate 1 and the flow path plate 2 can be made uniform, residual vibration can be reduced, and deterioration of the discharge image can be suppressed.

  Next, a liquid ejection head according to a second embodiment of the present invention will be described with reference to FIGS. 7 is an exploded perspective view of the head, FIG. 8 is a plan view of each member of the head seen from the nozzle side, FIG. 9 is a plan view of each member of the head seen from the piezoelectric actuator side, and FIG. FIG. 11 is a cross-sectional explanatory diagram in a direction orthogonal to the nozzle arrangement direction in a state where the nozzle plate is bonded to the flow path plate. .

  In the present embodiment, the nozzle plate 1 is formed with a concave portion 34 into which the convex portion 33 of the flow path plate 2 is fitted.

  Thereby, the thickness of the adhesive between the nozzle plate 1 and the flow path plate 2 can be made more uniform. In addition, since the fitting structure can be achieved by the uneven shape, there is also a positioning effect, and it is possible to prevent the positional deviation between the plurality of arranged nozzles 4 and the individual liquid chambers 6 and to obtain a head with good discharge characteristics.

  Next, a general press apparatus used for manufacturing the flow path plate in the present invention will be described with reference to FIG. FIG. 12 is an explanatory view of a shearing type portion of the pressing apparatus.

  A shearing die in press working is composed of an upper die 58 that moves up and down by being attached to a slide of a press machine, and a lower die 59 that is used while being fixed to a bolster.

  By lowering the upper mold 58 toward the lower side, the workpiece (plate) W serving as a flow path plate is sheared to form the individual liquid chamber 6, the fluid resistance portion 7, the liquid introduction portion 8, and the like described above. be able to.

  Here, the upper mold includes a die set 60A, a stripper plate 61, a punch 62, a sub guide post 63, a punch plate 64, a backing plate (not shown), and a shoulder bolt.

  The lower mold 59 includes a die 65, a sub guide bush 66, a location pin 67, a die plate 68, and a die set 60B.

  The punch 62 and the die 65 are precisely machined into the same shape and fixed so as to maintain an appropriate clearance. The stripper plate 61 can guide the work W and the punch 62 to a predetermined position by sandwiching and fixing the work W together with the die plate 68. In addition, the punch 62 has a role of removing the workpiece W from being lifted when the punch 62 is retracted.

  The die set 60B is used to easily and reliably align the upper and lower molds by the sub guide bush 66 and the sub guide post 63, and to perform setup change in a short time. The shape accuracy of the press is determined by the shape and curvature of the shear cut surface, and it is usually preferable that the shear surface is large and that the bending surface, fracture surface, burr and curvature are small. In the case of press working, a very thin plate of 40 to 100 μm tends to be bent.

  Next, the manufacturing process of the flow path plate 2 will be described with reference to FIGS. FIG. 13 and FIG. 14 are explanatory views for explaining the same.

  As shown in FIG. 13 (c), the general mold described above is used as shown in FIG. 13 (b) for the base material 2A to be the flow path plate 2 as shown in FIG. 13 (a). The base material 2B in which the individual liquid chamber 6, the fluid resistance portion 7, and the liquid introduction portion 8 are formed as shown in FIG.

  This is because by forming the individual liquid chamber 6, the fluid resistance portion 7, the liquid introduction portion 8 and the like by pressing, the shape accuracy is kept high within the variation between channels (between nozzles).

  At this time, if a metal plate that has been subjected to a step of forming a damper chamber (concave portion) 32 by etching or the like before the formation of the individual liquid chamber 6, the fluid resistance portion 7, and the liquid introduction portion 8 is used, the metal plate is rigid during press working Therefore, it is difficult to maintain the shape accuracy of the individual liquid chamber 6 and the fluid resistance portion 7.

  Therefore, as described above, first, in the first step, the base material 2B in which the individual liquid chamber 6, the fluid resistance portion 7, and the liquid introduction portion 8 are formed in the base material 2A is manufactured.

  Thereafter, as a second step, as shown in FIG. 14 (a), a press die is similarly used for the substrate 2B, and a half press process is performed as shown in FIG. The convex part 33 is formed in the joint surface side with the board 1, and the flow-path board 2 is obtained. In addition, the convex part 33 can also be formed by a burring process.

  Thus, by dividing into the first step for forming the individual liquid chamber 6, the fluid resistance portion 7, and the liquid introduction portion 8 and the second step for forming the damper chamber 32 and the convex portion 33, a highly accurate flow path. A plate can be formed. And by forming by the same press process, cost reduction can be achieved compared with the case where it processes by two different processes, a half etching process and a press process.

  Although the piezoelectric head is described in the above embodiment, the present invention is similarly applied to a thermal head using a substrate provided with a heating resistor as a wall surface member or other electrostatic head. can do.

  Also, a head-integrated liquid cartridge (cartridge-integrated head) can be obtained by integrating the above-described liquid discharge head and a tank that supplies liquid to the liquid discharge head.

  Next, an example of the image forming apparatus according to the present invention including the liquid ejection head according to the present invention will be described with reference to FIGS. FIG. 15 is an explanatory side view of the mechanism part of the apparatus, and FIG. 16 is an explanatory plan view of the main part of the mechanism part.

  This image forming apparatus is a serial type image forming apparatus. The carriage 233 is slidably held in the main scanning direction by main and slave guide rods 231 and 232 which are guide members horizontally mounted on the left and right side plates 221A and 221B, and the direction of the arrow is indicated by a main scanning motor (not shown) via a timing belt. Move and scan in the carriage main scanning direction.

  The carriage 233 is equipped with recording heads 234a and 234b that are integrated with a liquid discharge head according to the present invention and a tank that stores ink to be supplied to the head.

  Each recording head 234 has two nozzle rows. One nozzle row of one recording head 234a discharges black (K) droplets, and the other nozzle row discharges cyan (C) droplets. One nozzle row of the other recording head 234b discharges magenta (M) droplets, and the other nozzle row discharges yellow (Y) droplets. Here, a configuration in which droplets of four colors are ejected in a two-head configuration is used, but it is also possible to arrange four nozzle rows per head and eject each of the four colors with one head.

  Further, the ink of each color is replenished and supplied from the ink cartridge 210 of each color to the tank 235 of the recording head 234 via the supply tube 236 of each color.

  On the other hand, a material having a large friction coefficient is opposed to the half-moon roller (sheet feeding roller) 243 and the sheet feeding roller 243 that separate and feed the sheets 242 stacked on the sheet stacking portion (pressure plate) 241 of the sheet feeding tray 202 one by one. A separation pad 244 is provided.

  In order to send the fed paper 242 to the lower side of the recording head 234, a guide 245 that guides the paper 242, a counter roller 246, a conveyance guide member 247, and a pressing member 248 having a tip pressure roller 249. And. In addition, a transport belt 251 serving as a transport unit for electrostatically attracting the fed paper 242 and transporting the paper 242 at a position facing the recording head 234 is provided.

  The conveyor belt 251 is an endless belt, and is configured to wrap around the conveyor roller 252 and the tension roller 253 so as to circulate in the belt conveyance direction (sub-scanning direction). In addition, a charging roller 256 that is a charging unit for charging the surface of the transport belt 251 is provided. The charging roller 256 is disposed so as to come into contact with the surface layer of the conveyor belt 251 and to rotate following the rotation of the conveyor belt 251. The transport belt 251 rotates in the belt transport direction when the transport roller 252 is rotationally driven through timing by a sub-scanning motor (not shown).

  Further, as a paper discharge unit for discharging the paper 242 recorded by the recording head 234, a separation claw 261 for separating the paper 242 from the transport belt 251, a paper discharge roller 262, and a paper discharge roller 263 are provided. A paper discharge tray 203 is provided below the paper discharge roller 262.

  A double-sided unit 271 is detachably attached to the back surface of the apparatus main body. The duplex unit 271 takes in the paper 242 returned by the reverse rotation of the transport belt 251, reverses it, and feeds it again between the counter roller 246 and the transport belt 251. The upper surface of the duplex unit 271 is a manual feed tray 272.

  Further, a maintenance / recovery mechanism 281 for maintaining and recovering the nozzle state of the recording head 234 is disposed in a non-printing area on one side in the scanning direction of the carriage 233.

  The maintenance / recovery mechanism 281 includes cap members (hereinafter referred to as “caps”) 282a and 282b (hereinafter referred to as “caps 282” when not distinguished) for capping the nozzle surfaces of the recording head 234. .

  The maintenance / recovery mechanism 281 includes a wiper blade 283 that is a blade member for wiping the nozzle surface, and a liquid for performing idle ejection that ejects liquid droplets that do not contribute to recording in order to discharge the thickened recording liquid. An empty discharge receiver 284 for receiving droplets is provided.

  Further, in the non-printing area on the other side in the scanning direction of the carriage 233, there is an empty space for receiving a liquid droplet when performing an empty discharge for discharging a liquid droplet that does not contribute to the recording in order to discharge the recording liquid thickened during the recording. A discharge receiver 288 is disposed. The idle discharge receiver 288 includes an opening 289 along the nozzle row direction of the recording head 234 and the like.

  In this image forming apparatus configured as described above, the sheets 242 are separated and fed one by one from the sheet feeding tray 202, and the sheet 242 fed substantially vertically upward is guided by the guide 245, and is conveyed to the conveyor belt 251 and the counter. It is sandwiched between the rollers 246 and conveyed. Further, the leading edge of the sheet 242 is guided by the conveying guide 237 and pressed against the conveying belt 251 by the leading end pressure roller 249, and the conveying direction is changed by about 90 °.

  At this time, when the paper 242 is fed onto the charged transport belt 251, the paper 242 is attracted to the transport belt 251, and the paper 242 is transported in the sub-scanning direction by the circular movement of the transport belt 251.

  Therefore, by driving the recording head 234 according to the image signal while moving the carriage 233, ink droplets are ejected onto the stopped paper 242 to record one line, and after the paper 242 is conveyed by a predetermined amount, Record the next line. Upon receiving a recording end signal or a signal that the trailing edge of the paper 242 has reached the recording area, the recording operation is finished and the paper 242 is discharged onto the paper discharge tray 203.

  As described above, since the image forming apparatus includes the liquid discharge head according to the present invention as a recording head, a high-quality image can be stably formed.

  In the present application, the “paper” is not limited to paper, but includes OHP, cloth, glass, a substrate, etc., and means a material to which ink droplets or other liquids can be attached. , Recording media, recording paper, recording paper, and the like. In addition, image formation, recording, printing, printing, and printing are all synonymous.

  The “image forming apparatus” means an apparatus that forms an image by discharging liquid onto a medium such as paper, thread, fiber, fabric, leather, metal, plastic, glass, wood, ceramics, etc. “Formation” means not only giving an image having a meaning such as a character or a figure to a medium but also giving an image having no meaning such as a pattern to the medium (simply causing a droplet to land on the medium). ) Also means.

  The “ink” is not limited to an ink unless otherwise specified, but includes any liquid that can form an image, such as a recording liquid, a fixing processing liquid, or a liquid. Used generically, for example, includes DNA samples, resists, pattern materials, resins, and the like.

  In addition, the “image” is not limited to a planar image, and includes an image given to a three-dimensionally formed image and an image formed by three-dimensionally modeling a solid itself.

  Further, the image forming apparatus includes both a serial type image forming apparatus and a line type image forming apparatus, unless otherwise limited.

DESCRIPTION OF SYMBOLS 1 Nozzle plate 2 Flow path plate 3 Vibration plate member 4 Nozzle 6 Pressure chamber 8 Liquid introduction part 10 Common liquid chamber 11 Piezoelectric actuator 20 Frame member 31 Damper area | region 32 Damper chamber 33 Convex part 34 Concave part 233 Carriage 234a, 234b Recording head

Claims (4)

A nozzle plate formed with a plurality of nozzles for discharging droplets;
A flow path plate forming a plurality of individual liquid chambers through which the nozzle communicates;
A common liquid chamber member that forms a common liquid chamber that shares a liquid with the plurality of individual liquid chambers, and
A part of the wall surface of the common liquid chamber is a deformable damper region;
A damper chamber corresponding to the damper region is formed in the flow path plate,
The liquid discharge head according to claim 1, wherein a convex portion is formed in a portion corresponding to the damper chamber on a side of the flow path plate where the nozzle plate is joined.   The liquid ejection head according to claim 1, wherein the nozzle plate is formed with a recess into which the projection of the flow path plate is fitted.   The liquid discharge head according to claim 1, wherein the damper chamber and the convex portion of the flow path plate are formed by press working.   An image forming apparatus comprising the liquid discharge head according to claim 1.

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