JP4553111B2 - Laminated adhesive structure for thin plate parts - Google Patents

Description

  The present invention relates to a laminated adhesive structure for thin plate parts such as a metal plate used for a laminated ink jet recording head.

  As a prior art piezoelectric inkjet recording head, for example, in Patent Document 1, a nozzle plate in which a plurality of nozzles are formed at regular intervals, a pace plate in which a pressure chamber corresponding to each nozzle location is formed, A cavity plate is configured by laminating a manifold plate, which is interposed between the base plate and the nozzle plate and has a common ink chamber for supplying ink to each pressure chamber, with an adhesive. Ink from the ink reservoir (tank) is introduced into each common ink chamber from the ink supply hole on the back side of the unit, and a piezoelectric actuator is joined to the back of the cavity unit, and this piezoelectric actuator is driven for selection. A recording head for recording an image on a recording medium by discharging ink from the nozzles is disclosed.

In the cavity unit described in Patent Document 1, a relief groove for adhesive is formed on one side of the laminate of the plates so that the plate thickness of each plate penetrates at the same position above and below the relief groove. Air escape holes are drilled, and when the adhesive is applied to the laminated surface of each plate and superposed, the air contained in the laminated surface and adhesive is discharged to the outside of the uppermost plate surface along with the excess adhesive. Was configured to be.
JP 2002-105410 A (see FIGS. 4, 7, and 8)

  However, in the configuration of Patent Document 1, since the end faces on the outer peripheral side of the stacked plates are aligned substantially in the same plane in the stacking direction, excess of the adhesive applied to the stacked surface is the outer periphery. When it protrudes from the side end surface, it immediately drops down along the outer peripheral end surface, contaminates the bonding device when performing the bonding operation of the cavity unit, and takes time to clean it. There was a problem that decreased. Such a problem also occurs when a laminated product of other thin plate-like parts is manufactured.

  Therefore, the present invention has a technical problem to solve such a problem.

In order to solve this technical problem, the laminated bonding structure for thin plate parts according to the invention of claim 1 bonds a metal thin plate part including a plurality of thin plate parts each having a predetermined pattern formed on at least one side. In the laminated adhesion structure of thin plate-like components laminated via an agent, among the outer peripheral side end surfaces orthogonal to the laminated surface to which the adhesive is applied in at least two thin plate-like components among the plurality of thin plate-like components , At least a part is formed in a non-linear zigzag portion for holding the adhesive protruding from the laminating surface, and the zigzag portion in the thin plate-like component adjacent in the laminating direction has a concave portion that matches the laminating direction. It is arranged at a position not to be .

  According to a second aspect of the present invention, in the laminated adhesive structure for thin plate parts according to the first aspect, the zigzag portion has a concave portion that is triangular, square, trapezoidal, or substantially semicircular when viewed from the laminated surface. It is formed as follows.

According to a third aspect of the present invention, in the laminated adhesive structure for thin plate components according to the first or second aspect , the concave portion of the zigzag portion penetrates in the lamination direction of the thin plate components .

  According to a fourth aspect of the present invention, in the laminated adhesive structure of thin plate parts according to any one of the first to third aspects, the thin plate parts are plates for an ink jet recording head having a plurality of nozzles, The pattern is an ink flow path for allowing ink to pass from the ink supply source to the nozzles.

According to the first aspect of the present invention, since the zigzag portion in which the concave portion and the protruding portion are alternately formed is formed on the side end surface of at least two thin plate-like components among the plurality of thin plate-like components. The surface area of the side end face can be increased as compared with the case where the surfaces are substantially flat. Therefore, when the adhesive applied to the laminated surface of each thin plate-like component protrudes from the side end face, the dripping of the adhesive is reduced or eliminated by the amount that the adhesive is held along the increased area. It is possible to eliminate the fouling of the bonding apparatus, so that the production efficiency can be improved. Note that, preferably, the concave portion constituting the zigzag portion has a ridge line on the inside, or a narrow width, so that the protruding adhesive can be held by capillary action of the ridge line or narrow width. Dripping can be further reduced.

  According to the second aspect of the present invention, the shape of the zigzag portion in plan view can be selected variously, and in any case, the holding ability of the adhesive does not decrease.

According to the invention of claim 1 , since the zigzag portions are arranged so as not to coincide with each other as viewed from the lamination direction and alternately shifted between the thin plate-like components adjacent in the lamination direction, The contour line that forms the recess in the zigzag portion along the line forms a concave ridge line in cooperation with the surface of the adjacent plate-like component, and further increases the surface area, when laminating thin plate-like components When the adhesive applied to the laminated surface protrudes to the side end surface, the adhesive oozes out along the ridgeline and accumulates in the concave portion of the zigzag portion, so that a large amount of adhesive protrudes. It has the effect that it can be securely held so that it does not sag outside.

  According to the invention of claim 4, there is an effect that the production efficiency can be improved while securing the performance of the ink jet recording head.

  Next, an embodiment of the present invention will be described with reference to the drawings. 1 is a perspective view of a first embodiment of a piezoelectric ink jet recording head, FIG. 2 is an exploded perspective view, FIG. 3 is an enlarged exploded perspective view of a cavity unit, and FIG. 4 is an enlarged sectional view taken along line IV-IV in FIG. 5 is an enlarged perspective view of the zigzag portion, FIG. 6 is a sectional view taken along the line VI-VI in FIG. 5, FIG. 7 is an enlarged perspective view of the second embodiment of the zigzag portion, and FIGS. d) is a partial plan view showing still another embodiment of the zigzag portion.

  FIG. 1 is a perspective view of a cavity unit 1 and a piezoelectric actuator 2 in the piezoelectric ink jet recording head HD according to the first embodiment of the present invention. The cavity unit 1 is composed of a plurality of plates made of a metal plate. And a flexible flat cable 3 (see FIG. 3) for connection to an external device is overlapped and bonded to the upper surface of the plate-type piezoelectric actuator 2. Then, it is assumed that ink is ejected downward from the nozzle 4 opened on the lower surface side of the lowermost cavity unit 1.

  The cavity unit 1 is configured as shown in FIGS. That is, the nozzle plate 11, the first spacer plate 12, the damper plate 13, the two manifold plates 14a and 14b, the second spacer plate 15, the third spacer plate 16, and the base plate 17 in total are 8 thin plates, respectively. An adhesive 51 is applied to the laminated surface, and the layers are joined together.

  In the embodiment, except for the nozzle plate 11 made of synthetic resin, each of the plates 12 to 17 is made of 42% nickel alloy steel plate and has a thickness of about 50 to 150 μm. In the nozzle plate 11, a plurality of nozzles 4 for discharging ink having a minute diameter (in the embodiment, about 25 μm) are formed at minute intervals according to the resolution at the time of recording. In the embodiment, 75 nozzles 4 are formed in a length of 1 inch, and the arrangement density is 75 dpi (dot per inch). The nozzles 4 are arranged in five rows in a staggered manner along the first direction (long side direction, X direction) of the nozzle plate 11.

  Further, as shown in FIG. 2, a plurality of pressure chambers 36 are arranged in a staggered arrangement in the base plate 17 along the long side (the X direction) in five rows. In the embodiment, as shown in FIG. 2, the pressure chamber 36 has a direction connecting one end portion (tip portion) 36 a of the pressure chamber 36 communicating with the nozzle 4 and the other end portion 36 b communicating with the common ink chamber 7 described later. The longitudinal direction of Each pressure chamber 36 is formed with a narrow width so that the longitudinal direction thereof is along the second direction (short side direction, Y direction) of the base plate 17.

  The front end portion 36a of each pressure chamber 36 is similarly bored in a staggered arrangement in the two spacer plates 15, 16 and the two manifold plates 14a, 14b, the damper plate 13, and the first spacer plate 12. The nozzles 11 communicate with the nozzles 4 through through-holes 37 having a very small diameter.

  The third spacer plate 16 adjacent to the lower surface of the base plate 17 has a communication hole 38 connected to the other end 36b of each pressure chamber 36.

  The second spacer plate 15 adjacent to the lower surface of the third spacer plate 16 is provided with a connection channel 40 for supplying ink from the common ink chamber 7 to be described later to the pressure chambers 36. Each connection channel 40 includes an inlet hole 40a into which ink enters from the common ink chamber 7, an outlet hole 40b that opens to the pressure chamber 36 side (the communication hole 38), an inlet hole 40a, and an outlet hole 40b. A constricted portion 40c formed with a reduced cross-sectional area so as to have the largest flow path resistance in the connection flow path 40 is provided (see FIG. 3).

  In this embodiment, the narrowed portion 40c is formed to have a predetermined flow path resistance by half-etching the surface side adjacent to the third spacer plate 16. The inlet hole 40a and the outlet hole 40b are formed in alignment with both ends of the throttle portion 40c. The inlet hole 40 a passes through the second spacer plate 15. The outlet hole 40b is formed as a recess in the second spacer plate 15 adjacent to the third spacer plate 16 (see FIGS. 3 and 4).

  In the two manifold plates 14 a and 14 b, five common ink chambers 7 extending along the long side direction (X direction) are formed so as to penetrate the plate thickness so as to extend along each row of the nozzles 4. Has been. That is, by stacking two manifold plates 14a and 14b, and covering the upper surface with the second spacer plate 15 and covering the lower surface with the damper plate 13, a total of five common ink chambers (manifold chambers) 7 are respectively provided. It is formed in a sealed state. Each common ink chamber 7 overlaps a part of the pressure chamber 36 and extends long in the column direction of the pressure chambers 36 in a plan view as viewed from the stacking direction of the plates.

  As shown in FIGS. 3 and 4, a damper chamber 45 isolated from the common ink chamber 7 is formed as a recess on the lower surface side of the damper plate 13 adjacent to the lower surface of the manifold plate 14a. The positions and shapes of the damper chambers 45 are the same as those of the common ink chambers 7. Since the damper plate 13 is a metal material that can be elastically deformed as appropriate, the thin plate-like ceiling portion above the damper chamber 45 can freely vibrate both on the common ink chamber 7 side and on the damper chamber 45 side. it can. Even when the pressure fluctuation generated in the pressure chamber 36 propagates to the common ink chamber 7 during ink ejection, the ceiling portion elastically deforms and vibrates, thereby producing a damper effect that absorbs and attenuates the pressure fluctuation. It is possible to prevent the crosstalk that the fluctuation propagates to the other pressure chambers 36.

  Further, at least one of the base plate 17 and the third spacer plate 16 (in the embodiment, the wide surface of the third spacer plate 16 on the side of the base plate 17) is arranged between the rows of pressure chambers 36 ( An inspection flow groove 50 extending along the long side direction (X direction) and communicating with the outside is formed. In this case, by detecting the outflow of air from the outward opening of the flow groove for inspection 50 or the pressure drop on the ink supply passage 47 side, the sealing leakage in the region between the rows of the pressure chambers 36 is inspected, A leak from the pressure chamber 36 to the outside can also be inspected at the same time.

  An ink supply passage 47 communicating so as to supply ink from an ink storage portion (not shown) such as an ink tank to the common ink chamber 7 includes a base plate 17 in which a pressure chamber 36 is formed from the back side of the cavity unit 1, It penetrates through the second and third spacer plates 15 and 16 (see FIG. 2). More specifically, as shown in FIG. 2, the four ink supply passages 47 are along the short side direction (Y direction) of the cavity unit 1 and outside the row region of the nozzles 4 as shown in FIG. It is drilled to line up. These four ink supply passages 47 are described as 47a, 47b, 47c, and 47d in order from the left side of FIG. The ink supply passages 47a, 47b, 47c, and 47d are opened on the back surface of the cavity unit 1, and the filter body 20 having the filtering portion 20a corresponding to the openings is disposed and adhered with an adhesive or the like. (See FIG. 1).

  In this embodiment, as shown in FIG. 1, four ink supply passages 47 are provided, whereas five common ink chambers 7 are provided (individually, reference numerals 7a, 7a, 7b). , 7c, 7d (see FIG. 1).

  The ink supply passage 47a communicates across two ink inlets that are one end in the longitudinal direction of the two common ink chambers 7a and 7a arranged adjacent to the left side in FIG.

  The other ink supply passages 47b, 47c, and 47d are supplied with yellow, magenta, and cyan inks, respectively, and the corresponding common ink chambers 7b, 7c, and 7d are supplied to the ink supply passages 47b, 47c, and 47d, respectively. Are communicated one by one (see FIGS. 1 and 5).

  Ink supply passages 47, common ink chambers 7, through holes 37, communication holes 38, connection flow paths 40, damper chambers 45, inspection flow grooves 50 and the like in the metal plates 12 to 17 are formed and through holes. Are formed by etching, electrical discharge machining, plasma machining, laser machining, or the like. In one filter body 20 made of a synthetic resin such as polyimide and having a substantially rectangular thin sheet shape in plan view, a filtering portion 20a having a very small hole formed by laser processing or the like is formed. When the filter body 20 is made of metal, it may be formed by electroforming. These filter bodies 20 are joined with an adhesive so as to cover all the ink supply passages 47a to 47d.

  As shown in FIGS. 2, 5, and 6, among the plurality of stacked plates, in the embodiment, the two manifold plates 14 a and 14 b and the upper second spacer plate 15 are orthogonal to the stacked surface. The outer peripheral side end surfaces (the side end surfaces extending in the X direction and the side end surfaces extending in the Y direction) are each non-linear zigzag portions 52 for holding the adhesive 51 protruding from the laminated surface at least in part. Is formed.

  As can be understood from FIG. 5, the zigzag portion 52 in the first embodiment has a rectangular shape when viewed from a plan view (laminated surface). Further, the zigzag portion 52 of each plate 14a, 14b, 15 is in the X direction or Y direction of the protruding portion (the most protruding end surface of the side end surface of the plate) with respect to the length L1 of the concave portion in the X direction or Y direction. The zigzag portion 52 of the two manifold plates 14a and 14b adjacent to each other in the stacking direction, the length L1, the recess depth L2 (dimension in the direction along the stacking surface), and the manifold plate 14b and the second The zigzag portions 52 in the spacer plate 15 are shifted to positions that do not alternately coincide with the stacking direction (see FIGS. 5 and 6). In other words, the zigzag portion 52 of the manifold plate 14a and the second spacer plate 15 is disposed at a position that coincides with the stacking direction, and the zigzag portion 52 of the second manifold plate 14b is the zigzag portion 52 of the plates 14a and 15 adjacent vertically. Is disposed at a position shifted by a length L1.

  As described above, when the zigzag portion 52 in which the concave portions and the protruding portions are alternately formed is formed on the side end surface of one plate 14a (14b, 15), the side end surface is substantially flat. As compared with the above, the surface area of the side end face can be increased. Therefore, when the adhesive 51 applied to the laminated surface of each plate 14a (14b, 15) protrudes to the side end face, the adhesive 51 is retained by the amount that is retained along the increased area. Dripping can be reduced or eliminated.

  Furthermore, as shown in FIG. 5, since the concave portion constituting the zigzag portion has a ridge line 53b in the thickness direction of the plate on the inside, the protruding adhesive can be held by capillary action of the ridge line 53b. The drooping can be further reduced. In addition, even if the length L1 of the concave portion of the zigzag portion is a length capable of holding the adhesive by a capillary phenomenon, the same effect can be obtained.

  Then, when the zigzag portions 52 are arranged so as not to coincide with each other in the stacking direction between the plates 14a and 14b (14b and 15) adjacent to each other in the stacking direction, the zigzags along the stacking surface of the adjacent plates are arranged. 52, a line segment 53a in the depth direction and a line segment 53c in the back of the recess form a concave ridge line in cooperation with the surface of the adjacent plate-shaped component, and further increase the surface area. When laminating, when the adhesive 51 applied to the laminated surface protrudes to the side end surface, the adhesive 51 oozes out along the ridge lines 53a, 53b, 53c and accumulates in the concave portion of the zigzag portion 52. The large amount of adhesive 51 can be reliably held below the cavity unit 1 so as not to sag. In order to prevent such dripping of the adhesive 51, it is preferable to provide the zigzag portion 52 on the middle layer plate other than the lowermost layer and the uppermost layer plate in the bonding step.

  FIG. 7 shows the second embodiment, in which the length L2 of the protruding portion in the X direction or Y direction is set to be larger than the length L1 of the concave portion of the zigzag portion 52 in the X direction or Y direction. It is a form. Also in this embodiment, the number of the line segment (ridge line) 53a in the depth direction and the line segment (ridge line) 53b in the vertical direction of the zigzag portion 52 is the same as in the first embodiment, and the concave portions of the zigzag portion 52 match the stacking direction. The holding ability of the adhesive 51 is not lowered because the positions are alternately shifted so as not to occur.

  8 (a) to 8 (d) show an embodiment of the zigzag portion 52 in a plan view, and the zigzag portion 52 having a rectangular recess shown in FIG. 8 (a) is shown in FIG. 8 (b). There are a zigzag part 52 having a triangular concave part, a zigzag part 52 having a trapezoidal concave part shown in FIG. 8C, a zigzag part 52 having a substantially semicircular concave part shown in FIG. Can have substantially the same adhesive holding ability. If the plate thickness of the plate having the zigzag portion 52 is increased, the length of the vertical line segment (ridge line) 53b can be increased accordingly.

  The cavity unit 1 is configured by aligning and joining the eight thin plates 11 to 17 formed as described above to each other. As a result, a common ink chamber 7 extending in the long side direction is formed inside the cavity unit 1 as shown in FIGS. Furthermore, individual ink flow paths are formed from the inlet hole 40a of each connection channel 40 opened to the common ink chamber 7 to the nozzle 4 via the corresponding communication hole 38, pressure chamber 36, and through hole 37 in order. The

  The piezoelectric actuator 2 has a structure in which a plurality of piezoelectric sheets are laminated, although not shown, like the known one disclosed in JP-A-4-341853, etc. On the top surface (wide surface) of the even-numbered piezoelectric sheet from the bottom among the piezoelectric sheets, narrow individual electrodes are provided in the long side direction (X direction) at locations corresponding to the pressure chambers 36 in the cavity unit 1. The individual electrodes extend to the vicinity of the edge of the long side of each piezoelectric sheet along the Y direction orthogonal to the long side direction. A common electrode common to the plurality of pressure chambers 36 is formed on the upper surface (wide surface) of the odd-numbered piezoelectric sheet from the bottom. Further, on the upper surface of the uppermost sheet, as shown in FIG. 2, as the surface electrode 9, a surface electrode electrically connected to each of the individual electrodes, and an electrically connected to the common electrode A surface electrode to be connected is provided.

  Then, an adhesive sheet (not shown) made of a non-ink-permeable synthetic resin material is attached in advance to the entire lower surface (the wide surface facing the pressure chamber 36) of the plate-type piezoelectric actuator 2 having such a configuration. Then, the piezoelectric actuator 2 is bonded and fixed to the cavity unit 1 with the individual electrodes corresponding to the pressure chambers 36 in the cavity unit 1. Further, the flexible flat cable 3 is heated and pressurized on the upper surface of the piezoelectric actuator 2 so that various wiring patterns (not shown) in the flexible flat cable 3 are applied to the surface electrodes 9. Electrically joined.

  In the above configuration, when a voltage is applied between any one of the individual electrodes of the piezoelectric actuator 2 and the common electrode corresponding thereto, the stacking direction due to the piezoelectric longitudinal effect is applied to the active portion corresponding to both electrodes. Distortion occurs. This distortion reduces the internal volume of the pressure chamber 36 with respect to the arbitrary individual electrode. Therefore, if the polarization direction of the piezoelectric sheet sandwiched between the two electrodes is the same as the applied electric field, the ink in the pressure chamber 36 is ejected from the nozzle 4 in the form of droplets (predetermined printing is performed). ).

  The present invention is not limited to the above-described embodiment, and can be embodied in various forms. For example, instead of a piezoelectric actuator, a heat generating actuator may be used. Further, the zigzag portion 52 may be formed by plasma processing, laser processing, or the like. The zigzag portion 52 can be formed on all four side end surfaces or at least one or two side end surfaces of a plate in a plan view.

  In each of the embodiments described above, the present invention is applied to an ink jet recording head. However, when assembling an electronic component, the present invention has a structure in which a plurality of metal plate thin plate-like components having a pattern on at least one surface are laminated via an adhesive. Can be applied.

1 is a perspective view of a first embodiment of a piezoelectric inkjet recording head. 2 is an exploded perspective view of a piezoelectric inkjet recording head. FIG. It is an expansion disassembled perspective view of a cavity unit. FIG. 4 is an enlarged sectional view taken along line IV-IV in FIG. 1. It is an expansion perspective view of 1st Embodiment of a zigzag part. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. It is an expansion perspective view of 2nd Embodiment of a zigzag part. (A) is a partial plan view of the zigzag portion of the first embodiment, (b) is a partial plan view of the zigzag portion having a triangular recess, (c) is a partial plan view of the zigzag portion having a trapezoidal recess, (D) is a partial top view of the zigzag part which has a substantially semicircle-shaped recessed part.

Explanation of symbols

HD inkjet head 1 cavity unit 2 piezoelectric actuator 4 nozzle 7 (7a, 7b, 7c, 7d) common ink chamber 11 nozzle plate 12 first spacer plate 13 damper plate 14a, 14b manifold plate 15 second spacer plate 16 third spacer plate 17 Base plate 36 Pressure chamber 37 Through hole 38 Communication hole 40 Connection flow path 45 Damper chamber 47 (47a to 47d) Ink supply passage 51 Adhesive 52 Zigzag portion

Claims (4)

In the laminated adhesion structure of thin plate parts in which a metal thin plate part including a plurality of thin plate parts having a predetermined pattern formed on at least one side is laminated via an adhesive,
Among the plurality of thin plate-like components , at least a part of the outer peripheral side end surface orthogonal to the laminated surface to which the adhesive is applied in at least two thin plate-like components holds the adhesive protruding from the laminated surface. Formed in a non-linear zigzag part for
The laminated bonding structure for thin plate parts, wherein the zigzag portions in the thin plate parts adjacent to each other in the stacking direction are arranged at positions where the concave portions do not coincide with the stacking direction .   2. The lamination of thin plate-like components according to claim 1, wherein the zigzag portion is formed so as to have a triangular, square, trapezoidal, or substantially semicircular concave portion when viewed from the lamination surface. Adhesive structure. The laminated adhesive structure for thin plate parts according to claim 1 or 2 , wherein the concave portion of the zigzag portion penetrates in the lamination direction of the thin plate parts.   The thin plate-like component is a plate for an ink jet recording head having a plurality of nozzles, and the pattern is an ink flow path for allowing ink to pass through each nozzle from an ink supply source. 4. A laminated adhesive structure for thin plate parts according to any one of 1 to 3.

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