JP2011206993A - Self-sealing unit, liquid injection head unit, liquid injection device, method of manufacturing the self-sealing unit and method of manufacturing the liquid injection head unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a self-sealing unit suppressing variation of working pressure, a liquid injection head unit and a liquid injection device which use the self-sealing unit and suppress variation of liquid discharge speed and weight of discharged liquid droplets, a method of manufacturing the self-sealing unit and a method of manufacturing the liquid injection head unit.SOLUTION: The self-sealing unit includes: a liquid flow passage where liquid is made to flow; a self-sealing unit body 21 having a filter chamber with a filter installed therein and a pressure chamber with a valve element opening or closing the liquid flow passage; and a film 20 sealing the liquid flow passage, displaced to the pressure chamber side based on the negative pressure applied to the pressure chamber and moving and opening the valve element by transmitting the displacement to the valve element. In the film 20, a portion stretched on the filter chamber is bent when no negative pressure is applied.

Description

  The present invention relates to a self-sealing unit, a liquid ejecting head unit, a liquid ejecting apparatus, a self-sealing unit manufacturing method, and a liquid ejecting head unit manufacturing method.

  As a typical example of a liquid ejecting head, for example, an ink ejecting head that ejects ink droplets from a nozzle opening using a pressure acting on ink in a pressure generating chamber by displacement of a piezoelectric element is known. In the ink jet head according to the prior art, ink supplied from a liquid source such as an ink cartridge filled with ink is ejected from a nozzle by driving pressure generating means such as a piezoelectric element or a heating element. For example, by inserting an ink supply needle into the ink cartridge, ink in the ink cartridge is introduced into a reservoir, which is a common liquid chamber of the liquid ejecting head, from an introduction hole of the ink supply needle.

  Among these types of ink jet heads, there are also ink jet head units that are combined with a self-sealing unit provided in the middle of a flow path for supplying ink from a liquid supply source such as an ink cartridge to the ink jet head. Yes (see Patent Document 1). Such a self-sealing unit of an ink ejecting head unit opens a valve body when ink droplets are ejected from nozzle openings and the inside of the reservoir becomes negative pressure, and ink from the ink cartridge is stored in the ink ejecting head reservoir. Supply. Therefore, the self-sealing unit is a part of the flow path in which the valve body is disposed, and the pressure chamber in which the negative pressure acts is formed in the self-sealing unit main body in which the ink flow path is formed. is doing. Here, the pressure chamber is formed by covering the opening with a film. Thus, the valve is pressed by the film being bent toward the pressure chamber by the negative pressure acting in the pressure chamber, and the valve is moved by this pressing force to open the flow path.

JP 2009-184202 A

  In the self-sealing unit shown in Patent Document 1, a film for sealing the pressure chamber is stretched in a pressure chamber on which a valve element is disposed and a negative pressure acts. When the film is in a tensioned (tensioned) state, the film is pulled to the pressure chamber side during negative pressure, and a reaction force is generated on the film. Since this reaction force is different in each self-sealing unit, the operating pressure that can deform the film and displace the valve element at the time of negative pressure varies, which causes variations in the ink ejection speed and the weight of the ejected droplets. There is a problem that will occur. On the other hand, there is a problem that it is difficult to design in consideration of the reaction force in each self-sealing unit due to the physical properties of the film.

  Such a problem exists not only in the ink ejecting head unit but also in a liquid ejecting head unit that ejects liquid other than ink.

  In view of the above-described prior art, the present invention provides a self-sealing unit that suppresses variations in operating pressure, a liquid ejecting head unit that uses the same, and a liquid ejecting head unit and a liquid ejecting apparatus that suppress variations in the weight of discharged liquid droplets. Another object is to provide a method for manufacturing a self-sealing unit and a method for manufacturing a liquid jet head unit.

In the self-sealing unit of the present invention, a liquid flow path through which a liquid flows is formed, and the liquid flow path is provided with a filter chamber in which a filter is installed and a valve body that opens or closes the liquid flow path. A self-sealing unit main body having a pressure chamber formed therein, and sealing the liquid flow path and displacing the pressure chamber side based on a negative pressure acting on the pressure chamber. A self-sealing unit provided with a film that moves and opens the valve body by transmitting to the portion of the film that is stretched on the pressure chamber. A self-sealing unit characterized in that it is bent when it is not, wherein a portion of the film stretched on the pressure chamber is bent when the negative pressure is not applied. Features.
In the present invention, a portion of the film stretched on the pressure chamber is bent when the negative pressure is not applied, so that no reaction force is generated on the film when the negative pressure is applied. Therefore, it is not necessary to consider the reaction force of the film. Thereby, the dispersion | variation in an operating pressure can be suppressed.

  Here, it is preferable that a pressure receiving plate is provided in the pressure chamber, and the film is configured to transmit the displacement to the valve body via the pressure receiving plate. By comprising in this way, a film can move more freely, the reaction force of a film can be suppressed and the dispersion | variation in an operating pressure can be suppressed.

The liquid ejecting head unit according to the present invention includes any of the self-sealing units described above, a nozzle opening that ejects liquid, and a flow that communicates with the nozzle opening and communicates with the liquid flow path of the self-sealing unit. A liquid ejecting head including pressure generating means for causing a pressure change in the pressure generating chamber in the passage and ejecting the liquid from the nozzle opening is provided.
By having the self-sealing unit that suppresses the reaction force of the film and suppresses the variation of the operating pressure, the liquid ejecting head unit of the present invention suppresses the liquid discharging speed and the weight variation of the discharged droplets. .

  The liquid ejecting apparatus according to the invention includes the liquid ejecting head unit described above. By including the liquid ejecting head unit in which the liquid ejection speed and the weight variation of the ejected droplets are suppressed, the liquid ejecting apparatus of the present invention improves the liquid ejecting characteristics.

  In the manufacturing method of the self-sealing unit according to the aspect of the invention, the liquid channel for supplying the liquid of the liquid source to the liquid ejecting head is formed on the surface, and the liquid channel opens the liquid channel. In the self-sealing unit body provided with a pressure chamber provided with a valve body to be closed, the liquid flow path is sealed and displaced toward the pressure chamber based on the negative pressure acting on the pressure chamber. A film that moves and opens the valve body by transmitting displacement to the valve body is fixed to a wall surface portion defining the liquid flow path of the self-sealing unit body to manufacture a self-sealing unit. A method of manufacturing a self-sealing unit that deforms a film in a region on the pressure chamber by applying pressure to a film of the film placed on the wall surface of the self-sealing unit body. Having a process And features. By including the film deformation step, it is possible to manufacture a self-sealing unit that suppresses the reaction force of the film and suppresses variations in the operating pressure.

  As a preferred embodiment of the present invention, the film deformation step is to press and deform the film in the region on the pressure chamber by a pressing member, or the film deformation step is a region on the pressure chamber. The film may be deformed by applying a pressure different from the atmospheric pressure to the liquid channel from the downstream side of the liquid channel.

  It is preferable to simultaneously perform the film deformation step and the fixing step for fixing the film on the wall surface of the self-sealing unit body. By comprising in this way, the self-sealing unit which suppressed the reaction force of the film more easily and suppressed the dispersion | variation in operating pressure can be manufactured.

  In the film deformation step, the film in the region on the pressure chamber is preferably heated. This is because the film is more easily bent by heating.

  The method of manufacturing a liquid jet head unit includes a step of performing the method of manufacturing the self-sealing unit. By manufacturing a self-sealing unit that suppresses variations in operating pressure by suppressing reaction force of the film, a liquid ejecting head unit in which variations in liquid discharge speed and weight of discharged droplets are suppressed can be manufactured.

1 is a schematic configuration diagram of an ink jet recording apparatus. It is a front view of a self-sealing unit and a head. It is an external view of a self-sealing unit. FIG. 3 is a plan view of FIG. 2. It is a VV line arrow directional view in FIG. FIG. 6 is a schematic cross-sectional view conceptually showing an extracted pressure chamber portion of FIG. 5. It is a schematic plan view which shows a manufacturing process. It is a schematic sectional drawing which shows a manufacturing process.

  FIG. 1 is a schematic configuration of an ink jet recording apparatus provided with an ink jet head according to an embodiment of the present invention, FIG. 2 is a front view of the main part of the ink jet head, and FIG. FIG. 4 is a plan view of FIG. 2, and FIG. 5 is a view taken along line VV in FIG.

  An ink jet recording apparatus will be described with reference to FIG. As shown in the figure, an ink jet recording apparatus 1 as a liquid ejecting apparatus has an ink jet recording head (hereinafter referred to as a head) 4 as a liquid ejecting head. The head 4 is fixed to a carriage 3 on which the ink cartridge 2 is mounted. The carriage 3 has a box shape that opens to the top, is attached so that the nozzle surface of the recording head 4 is exposed on the surface (lower surface) facing the recording paper S, and accommodates the ink cartridge 2. Then, ink from the ink cartridge 2 is supplied to the head 4 through a self-sealing unit (not shown).

  The carriage 3 is connected to a stepping motor 6 via a timing belt 5 and reciprocates in the paper width direction (main scanning direction) of the recording paper S. As a result, ink droplets are ejected onto the upper surface of the recording paper S while moving the carriage 3 so that images and characters are printed on the recording paper S in a dot matrix.

  The illustrated head 4 is provided with a self-sealing unit (not shown in FIG. 1) that also serves as a flow path forming member in which a flow path for supplying ink from the ink cartridge 2 to the head 4 is formed. Yes. In the example of FIG. 1, an example in which the ink cartridge 2 as a liquid source is accommodated in the carriage 3 has been described. However, the ink cartridge 2 is accommodated in a location different from the carriage 3 and is supplied via a supply pipe. The present invention can also be applied to an ink jet recording apparatus configured to pump ink to the flow path forming member of the head 4.

  Next, the head 4 will be described with reference to FIG. A self-sealing unit 10, which will be described in detail later, is provided on the upper part of the head 4, and a nozzle plate 8 is provided on the lower part of the head 4. The head 4 is formed with a head flow path (not shown). The head flow path includes a reservoir chamber for storing ink and a pressure generation chamber for generating pressure by pressure generation means. 4 communicates with the nozzle openings formed in the nozzle plate 8. Ink from the self-sealing unit 10 is supplied to the head flow path and filled in the head flow path, and pressure is generated by pressure generating means such as a piezoelectric element, whereby ink in the pressure generating chamber ejects ink droplets from the nozzle openings. It is supposed to be. The liquid ejecting head unit 9 includes the head 4 and a self-sealing unit 10. The self-sealing unit 10 is supplied with ink from the ink cartridge 2. For example, ink is supplied from the ink cartridge 2 to the self-sealing unit 10 via a supply tube or an ink supply needle.

  The self-sealing unit 10 will be specifically described with reference to FIGS. As shown in these drawings, the self-sealing unit 10 has a rectangular parallelepiped block shape having a rectangular board surface, and a film 20 made of resin (for example, polypropylene, polyethylene, polyethylene terephthalate, etc.) is attached to both the resin main body 21. The board surface ink flow path 11 is formed on each board surface by heat-welding and sealing the board surface. That is, a disk surface ink flow path 11 is defined by the wall surface portion 12 on each disk surface of the main body 21. The board surface ink flow paths 11 are symmetrical to each other as will be described later, and each has a main flow path 24. The main channel 24 is in a wide state (in a wide portion) from the inlet portion 25 toward the outlet portion 26 (in the direction of ink flow), and the outlet portion 26 is provided with a first filter 27. The first filter 27 is arranged on a wide part of the board surface in an area including the wide outlet portion 26, and a large area is secured. The first filter 27 mainly traps foreign matter contained in ink that has circulated through a valve body 35 described later.

  The first filter 27 has a surface along the ink flow direction (a surface parallel to the disk surface), and the ink flowing through the main flow path 24 passes through the first filter 27 from the outside of the disk surface to the inside of the main body 21. It is sent to the lower part and sent from the two discharge holes 28 to the head 4 (see FIG. 2). The ink sent to the main flow path 24 spreads from a narrow flow path to a wide flow path (spreads in the width direction of the outlet portion) and is discharged from the discharge hole 28 at the end to one reservoir chamber of the head 4 (see FIG. 2). Sent. That is, two discharge holes 28 connected to one reservoir chamber are provided for each main flow path 24, and four discharge holes 28 are provided in one self-sealing unit 10 (see FIG. 4).

  An ink introduction hole 31 is provided in each upper end of the self-sealing unit 10, and ink is supplied from the ink cartridge 2 to the ink introduction hole 31. The ink supplied to one (left side in FIG. 4) of the ink introduction hole 31 is sent to the inlet 25 of the main channel 24 shown in FIG. The ink supplied to the ink introduction hole 31 on the right side in FIG. 4 is sent to the inlet 25 of the main flow path 24 provided on the back side of the paper surface of FIG. That is, in the self-sealing unit 10 of the present embodiment, two symmetrical ink flow paths 30 are provided.

  In the ink flow path 30 connected to the ink introduction hole 31, as indicated by an arrow A in FIG. 4, the ink supplied to one (left side in FIG. 4) of the ink introduction hole 31 flows upward in FIGS. 4 and 5. After that, the second filter 32 provided in the filter chamber 33 is distributed downward and sent to the pressure chamber 34 shown in FIG. Further, as indicated by an arrow B in FIG. 4, the ink flow path 30 is configured so that the ink supplied to the other (right side in FIG. 4) ink flows to the lower side in FIGS. 4 and 5. It is formed so as to flow through the second filter 32 provided in the filter chamber 33 shown in FIG. 2 and to go to the upper side in FIGS. 4 and 5 and to be sent to the pressure chamber 34 existing on the back side of the paper surface of FIG. ing. The second filter 32 has a plane parallel to the board surface and is arranged in parallel with the first filter 27.

  A valve body 35 is provided in each ink flow path 30 between the ink introduction hole 31 (second filter 32) and the pressure chamber 34 (inlet portion 25 of the main flow path 24), and the reservoir of the head 4 (see FIG. 2). When the chamber pressure decreases, that is, when the ink is ejected and the pressure on the main flow path 24 side is relatively decreased, the valve element 35 operates to allow the ink flow.

  That is, when the ink is supplied from the ink introduction hole 31 at a predetermined pressure, the valve body 35 is closed when the ink is stored in the reservoir chamber of the head 4 (see FIG. 2). When the pressure on the wake side decreases due to ink discharge, the valve body 35 is opened by the negative pressure generated thereby, and ink is supplied.

  Here, the valve body 35 will be described with reference to FIG. The valve body 35 includes a shaft portion 40 and a disc portion 41 formed integrally with the shaft portion 40 on one end side of the shaft portion 40, and the shaft portion 40 is a through hole formed in the pressure chamber 34. 42 is inserted. On the through hole 42 side of the disc portion 41, a convex portion 43 is provided so as to protrude toward the through hole 42 around the periphery of the through hole 42. One end of a spring 44 is connected to the back surface (second filter 32 side) of the disc portion 41, and the other end of the spring 44 is connected to a spring seat 45. The spring seat 45 constitutes a bottom surface portion of the filter chamber 33, and a circulation hole 46 through which ink flows is formed in the spring seat 45. Such a spring 44 urges the valve body 35 toward the film 20 because the spring seat 45 is fixed to the filter chamber 33. In this case, the valve body 35 is closed by the convex portion 43 and the bottom surface of the pressure chamber 34. Further, a pressure receiving plate 47 is provided in the pressure chamber 34, and the pressure receiving plate 47 is provided so as to contact the shaft portion 40. The pressure receiving plate 47 is not fixed to the film 20 in this embodiment. That is, in the present embodiment, the pressure receiving plate 47 is displaced toward the pressure chamber 34 simultaneously with the film 20 when the film 20 contacts the pressure receiving plate 47 when the film 20 is displaced toward the pressure chamber 34. When the pressure receiving plate 47 is displaced, the valve body 35 is moved in contact with the valve body 35.

  In the present embodiment, since the pressure receiving plate 47 is not fixed to the film 20, in order to displace the pressure receiving plate 47 stably, a regulating member 48a for regulating the displacement of the pressure receiving plate 47 is provided in the pressure chamber 34. A wall surface is provided around the through hole 42. A regulating member 48b fitted to the regulating member 48a is provided on the regulating member 48a side of the pressure receiving plate 47 so as to surround the regulating member 48a. That is, when the pressure receiving plate 47 is actuated, the regulating member 48b is fitted into the regulating member 48a, so that the pressure receiving plate 47 can be stably actuated, whereby the valve body 35 is actuated stably. Can do. In this case, each of the regulating members 48a and 48b is provided with a slit-like opening (not shown), and when the valve body 35 is opened, the ink is regulated through the slit-like opening. The members 48a and 48b are configured to be able to circulate.

  That is, when a negative pressure is applied to the film 20 in the pressure chamber 34, that is, the pressure on the downstream side is lowered by the ejection of ink, and the pressure in the pressure chamber 34 is lower than the external pressure of the self-sealing unit. Then, it is displaced to the pressure chamber 34 side, and this displacement is transmitted to the valve body 35. This resists the urging force of the spring 44 acting on the valve body 35 and moves the valve body 35 via the pressure receiving plate 47 to open the space between the ink flow path 30 (see FIG. 5) and the pressure chamber 34. State. Further, the valve body 35 and the pressure receiving plate 47 are arranged eccentric from the center of the pressure chamber 34.

  In the present embodiment, the film 20 on the pressure chamber 34 bends and protrudes downstream from the bonding surface between the film 20 and the wall surface portion 12, and is welded onto the wall surface portion 12 of the pressure chamber 34. Yes. That is, the film 20 on the pressure chamber 34 is curved in this embodiment when no negative pressure is applied. If the film 20 is not in a relaxed and bent state but is in a tensioned state, if the negative pressure is applied, the film 20 is pulled downstream and resists the tension, so a reaction force is generated in the film 20 To do. However, in this embodiment, since the film 20 is in a bent state, no reaction force is generated even if a negative pressure is applied and the film 20 is pulled downstream.

  Thus, in this embodiment, since the film 20 is bent in a state where no negative pressure is applied, no reaction force is generated even if the negative pressure is applied and the film 20 is pulled downstream. As a result, in the self-sealing unit 10 of the present embodiment, it is not necessary to consider the reaction force of the film 20 at the time of design, and variations in operating pressure can be suppressed.

  Further, in the present embodiment, the pressure receiving plate 47 and the film 20 are not fixed when the negative pressure is generated. Therefore, the film 20 can move more freely in accordance with the negative pressure, the variation factor of the operating pressure can be eliminated, and a stable operating pressure can be obtained.

  Further, a shelf 36 as a stepped portion extending in the ink transport direction (vertical direction in FIG. 2) is formed in the main channel 24 of the self-sealing unit 10 of the present embodiment. The shelf 36 is formed at the end of the main flow path 24 (both ends of the wide portion), and the depth is reduced. By providing the shelf 36 at the end of the main flow path 24, when bubbles are mixed in the main flow path 24, the shelf 36 has a shallow depth due to the bubbles floating in the narrow flow path near the inlet 25. Air bubbles are prevented from entering the glass. For this reason, even if air bubbles are mixed into the main flow path 24, the ink flows through the shelf 36 and is supplied to the head 4 (see FIG. 2).

(Production method)
The region of the film 20 that seals the pressure chamber 34 must be slightly bent, and as described above, the film 20 cannot be displaced toward the pressure chamber 34 without receiving a reaction force when negative pressure is generated. Therefore, when the film 20 is welded to the main body 21, it can be considered that the film 20 on the pressure chamber 34 is welded to the main body 21 in a bent state.

  However, if the entire film is welded to the board surface of the main body 21 while the film on the pressure chamber 34 is bent, the film 20 is drawn to the pressure chamber 34 side in a region other than the pressure chamber 34 to cause wrinkles. With the wrinkles approaching, the film 20 is welded to the board surface, and air bubbles accumulate in the wrinkled portions of the film 20 that seals the filter, such as the film 20 on the filter chamber 33 and the film 20 on the outlet portion 26. In other words, bubbles may be difficult to be discharged even during cleaning, and it is necessary to prevent this.

  Therefore, in the present embodiment, the film 20 is welded to the main body 21 so that the film 20 does not wrinkle when the film 20 is welded to the main body 21. Hereinafter, the manufacturing method of the self-sealing unit of this embodiment will be described in detail.

  First, after forming the main body 21 made of resin by molding, the main body 21 is accommodated in the jig 100 as shown in FIG. The jig 100 has a block shape and includes a housing portion 101 that houses the main body 21. Then, in this state, the film substrate 102 larger than the opening of the housing portion 101 is placed on the jig 100 (placement step). The film base 102 is formed with perforations (not shown) having substantially the same shape as the board surface of the main body 21, and a positioning pin (not shown) is used so that the area surrounded by the perforations coincides with the board surface of the main body 21. The film substrate 102 is positioned on a jig.

  Thereafter, the film substrate 102 on the pressure chamber 34 is bent in a state where no negative pressure acts, that is, a curved surface (film deformation step), and the film substrate 102 is formed on the board surface in this state. It is welded (fixed) to the board surface 21 (welding process). That is, as shown in FIG. 8, the pressing member 104 presses and bends the film substrate 102 and the heating member 105 heats the film substrate 102 so as to cover the area to be welded, thereby By welding to the wall surface portion 12, the film base material 102 is bent in the pressure chamber 34 and welded. In this way, the film 20 on the pressure chamber 34 can be flexed in a state where no negative pressure is applied.

  In this case, in this embodiment, in order to weld the film 20 to the main body 21 so as not to wrinkle the film 20 as described above, the film base material 102 in the regions X1 and X2 shown in FIG. The fixing member is fixed to the board surface of the main body 21 (positioning step). In this state, the film base material 102 on the pressure chamber 34 is curved, and in this state, the main body 21 is formed on the board surface. It welds to the wall surface part 12. The region X1 is a region outside the opening of the housing portion 101 on the surface where the opening of the housing portion 101 of the jig 100 is provided, and faces the outlet portion 26 where the first filter 27 is provided. The area to do. By fixing this region X1, it is possible to position the film base material 102 on the wall surface portion 12 on the opposite side of the pressure chamber 34 of the outlet portion 26 where the first filter 27 is installed. The region X2 is a region outside the opening of the housing portion 101 on the surface of the jig 100 where the opening of the housing portion 101 is provided, and the second filter chamber 33 in which the second filter 32 is provided. Refers to the area opposite to. By fixing this region X2, it is possible to position the film base material 102 on the wall surface portion 12 on the opposite side of the pressure chamber 34 of the filter chamber 33 in which the second filter 32 is installed. Here, the term “fixing” means temporary fixing.

  As described above, in this embodiment, the regions X1 and X2 are fixed, and the pressure chamber 34 in the room in which each filter is installed and the film base material 102 on the wall surface portion 12 on the opposite side are positioned, whereby the pressure is increased. Even when the film substrate 102 on the chamber 34 is pressed by the pressing member 104 to draw the film 20 from the periphery in order to make the film substrate 102 into a curved surface, wrinkles on the film substrate 102 on the filter can be suppressed. In other words, in the present embodiment, since the region X1 is fixed, the film base material 102 on the wall surface portion 12 opposite to the pressure chamber 34 of the outlet portion 26 can be positioned. The film 20 provided on the one filter 27 is prevented from wrinkling. Further, since the region X2 is fixed, the film base material 102 on the wall surface portion 12 on the side opposite to the pressure chamber 34 of the filter chamber 33 can be positioned, so that the region X2 is provided on the second filter 32. The film 20 is prevented from wrinkling.

  In this case, if the entire circumference of the housing portion 101 of the jig 100 is fixed, the film substrate 102 is not drawn into the pressure chamber 34 side when the film substrate 102 on the pressure chamber 34 is pressed. The film 20 on the pressure chamber 34 cannot be curved. Further, if the entire circumference is fixed and the film substrate 102 on the pressure chamber 34 is pressed to such a degree that it can be curved, the film substrate 102 is stretched, and the physical properties of the film are thereby increased. Since it changes, it is not preferable. Therefore, it is preferable to fix a part of the film substrate 102 as in this embodiment.

  Thereafter, the pressing member 104, the heating member 105, and the fixing member are removed, and regions other than the region surrounded by the perforation are removed from the film base material 102, and the film 20 is fixed to the main body 21 from the jig 100. The self-sealing unit 10 provided in a state where the film 20 on the pressure chamber 34 is bent in a state where no wrinkle is formed and no negative pressure is applied is taken out. Then, the liquid flow path of the manufactured self-sealing unit 10 is installed in the recording head 4 so as to communicate with the head flow path.

  In the above-described embodiment, the film 20 on the pressure chamber 34 is curved by the pressing member 104 in the film deformation step. However, the method for causing the film 20 to be bent is not limited to the above-described embodiment. For example, in the film deformation step, the film substrate 102 can be curved by applying a negative pressure from the discharge hole 28 (see FIG. 2) of the self-sealing unit 10. That is, the film 20 can be curved without using the pressing member 104. Even when the film 20 is curved as described above by negative pressure, the film 20 on the pressure chamber 34 can be sufficiently bent to increase the mobility of the film 20 and reduce the reaction force applied to the film 20. . In addition, when applying a pressure from the discharge hole 28, it is good not only to make the film 20 into a curved surface shape by the negative pressure mentioned above, but it is good also as a curved surface shape which protruded the film 20 outside by applying a positive pressure. Even if it does in this way, it can be set as the film 20 of the state in which the pressure chamber 34 top was fully bent.

  Further, when the film substrate 102 is deformed in the film deformation step, the film substrate 102 may be further heated. By heating in this way, the film 20 is more easily bent, but in this case, the physical properties of the film 20 stretched on the pressure chamber 34 may change, so the film 20 is heated at a very high temperature. It is not preferable to do.

  In the present embodiment, the film 20 on the pressure chamber 34 is curved in a state where no negative pressure acts, but if the reaction force is not generated on the film 20 on the pressure chamber 34, the film 20 is curved. It is not limited to being. For example, it is not limited to a curved surface shape but may be in a bent state, that is, a relaxed state. However, it is preferable to provide a curved surface as in this embodiment because the film operates without being biased.

  In the above-described embodiment, the film 20 and the pressure receiving plate 47 are not fixed, but the present invention is not limited to this. The film 20 and the pressure receiving plate 47 may be fixed. In this case, by forming the pressing member 104 from a material having good thermal conductivity, the pressure receiving plate 47 and the film 20 can be fixed while the film 20 is bent at the time of welding. Even in this case, it is necessary that the film 20 bends when no negative pressure is applied.

  Furthermore, in the above-described embodiment, the ink jet recording head has been described as an example of the liquid ejecting head. However, the present invention is widely intended for all liquid ejecting heads and ejects liquids other than ink. Of course, the present invention can also be applied to a liquid ejecting head. Other liquid ejecting heads include, for example, various recording heads used in image recording apparatuses such as printers, color material ejecting heads used in the manufacture of color filters such as liquid crystal displays, organic EL displays, and FEDs (field emission displays). Examples thereof include an electrode material ejection head used for electrode formation, a bioorganic matter ejection head used for biochip production, and the like.

  DESCRIPTION OF SYMBOLS 1 Inkjet recording device, 2 Ink cartridge, 4 Recording head, 10 Self-sealing unit, 20 Film, 21 Main body, 24 Main flow path, 25 Inlet part, 26 Outlet part, 27 First filter, 28 Ejection hole, 30 Ink Flow path, 31 ink introduction hole, 32 second filter, 34 pressure chamber, 35 valve body, 47 pressure receiving plate

Claims (10)

A liquid flow path through which liquid flows is formed, and the liquid flow path includes a filter chamber in which a filter is installed and a pressure chamber in which a valve body that opens or closes the liquid flow path is provided. Stop unit body,
The liquid flow path is sealed and displaced to the pressure chamber side based on the negative pressure acting on the pressure chamber, and the valve body is moved and opened by transmitting this displacement to the valve body. A self-sealing unit comprising a film,
The self-sealing unit, wherein a portion of the film stretched on the pressure chamber is bent when the negative pressure is not applied. The pressure chamber is provided with a pressure receiving plate,
The self-sealing unit according to claim 1, wherein the film is configured to transmit the displacement to the valve body through the pressure receiving plate. The self-sealing unit according to claim 1 or 2,
And a nozzle opening for injecting liquid, and a pressure change in the pressure generation chamber in the flow path communicating with the liquid flow path of the self-sealing unit, and communicating with the nozzle opening, and the liquid from the nozzle opening A liquid ejecting head unit comprising: a liquid ejecting head including pressure generating means for ejecting the liquid.   A liquid ejecting apparatus comprising the liquid ejecting head unit according to claim 3. A liquid flow path through which liquid flows is formed, and the liquid flow path includes a filter chamber in which a filter is installed and a pressure chamber in which a valve body that opens or closes the liquid flow path is provided. In the stop unit body,
The liquid flow path is sealed and displaced to the pressure chamber side based on the negative pressure acting on the pressure chamber, and the valve body is moved and opened by transmitting this displacement to the valve body. A self-sealing unit manufacturing method for manufacturing a self-sealing unit by fixing a film on a wall surface portion defining the liquid flow path of the self-sealing unit body,
A self-sealing comprising a film deformation step of deflecting the film in the region on the pressure chamber by applying pressure to a film placed on the wall surface of the self-sealing unit main body. Unit manufacturing method.   6. The method of manufacturing a self-sealing unit according to claim 5, wherein the film deforming step causes the film in the region on the pressure chamber to be deformed by being pressed by a pressing member.   In the film deformation step, the film in the region on the pressure chamber is deformed by bending the film in the liquid flow path by applying a pressure different from the atmospheric pressure from the downstream side of the liquid flow path. A method for producing a self-sealing unit according to claim 6.   The self-sealing unit according to any one of claims 5 to 7, wherein the film deformation step and an adhering step for adhering the film onto the wall surface of the self-sealing unit main body are performed simultaneously. Production method.   The method for manufacturing a self-sealing unit according to any one of claims 5 to 8, wherein in the film deformation step, the film in a region on the pressure chamber is heated.   A method for manufacturing a liquid jet head unit, comprising the step of performing the method for manufacturing a self-sealing unit according to claim 5.

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