WO2016133117A1 - 流路部材、およびそれを用いた液体吐出ヘッドならびに記録装置 - Google Patents
流路部材、およびそれを用いた液体吐出ヘッドならびに記録装置 Download PDFInfo
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- WO2016133117A1 WO2016133117A1 PCT/JP2016/054573 JP2016054573W WO2016133117A1 WO 2016133117 A1 WO2016133117 A1 WO 2016133117A1 JP 2016054573 W JP2016054573 W JP 2016054573W WO 2016133117 A1 WO2016133117 A1 WO 2016133117A1
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- Prior art keywords
- hole
- escape
- flow path
- plate
- holes
- Prior art date
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- 239000000758 substrate Substances 0.000 description 21
- 239000010410 layer Substances 0.000 description 16
- 239000000919 ceramic Substances 0.000 description 14
- 239000000976 ink Substances 0.000 description 11
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- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
- B41J2/1433—Structure of nozzle plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
- B41J2/14201—Structure of print heads with piezoelectric elements
- B41J2/14209—Structure of print heads with piezoelectric elements of finger type, chamber walls consisting integrally of piezoelectric material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/16—Production of nozzles
- B41J2/1607—Production of print heads with piezoelectric elements
- B41J2/1609—Production of print heads with piezoelectric elements of finger type, chamber walls consisting integrally of piezoelectric material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/16—Production of nozzles
- B41J2/1621—Manufacturing processes
- B41J2/1623—Manufacturing processes bonding and adhesion
Definitions
- the present disclosure relates to a flow path member, a liquid discharge head using the flow path member, and a recording apparatus.
- a liquid discharge head for example, an ink jet head that performs various types of printing by discharging a liquid onto a recording medium is known.
- a liquid discharge head for example, an ink jet head that performs various types of printing by discharging a liquid onto a recording medium is known.
- a flow path member having a discharge hole and a pressure chamber used for a liquid discharge head a member in which a plurality of metal plates each having a hole or a groove to be a flow path is stacked is known. These metal plates are joined with an adhesive. In order to suppress the adhesive from flowing into the holes and grooves during joining, an adhesive relief groove is formed around the hole and groove of the metal plate in an annular shape. They are connected to each other (for example, see Patent Document 1).
- a plurality of plates having holes serving as flow paths through which liquid flows are stacked via an adhesive, and at least one of the plates is spaced substantially the same distance from the holes, A plurality of adhesive relief holes are disposed so as to surround the holes.
- the liquid discharge head includes a flow path member for the liquid discharge head and a pressurizing unit that pressurizes the liquid in the flow path.
- the recording apparatus includes the liquid discharge head, a transport unit that transports a recording medium to the liquid discharge head, and a control unit that controls the liquid discharge head. .
- FIG. 2 is a plan view of a head body that is a main part of the liquid ejection head of FIG. 1.
- FIG. 3 is an enlarged view of a region surrounded by an alternate long and two short dashes line in FIG.
- FIG. 3 is an enlarged view of a region surrounded by an alternate long and two short dashes line in FIG.
- (A) is a longitudinal sectional view taken along the line VV in FIG. 3, and (b) is an enlarged view of a part of (a) when a stacking error occurs.
- (A) is a plan view of a plate
- (b) is a plan view of a relief hole of the plate of (a) and another plate
- (c) is a flow path and a relief hole of another embodiment.
- FIG. 1A is a schematic side view of a color inkjet printer 1 (hereinafter sometimes simply referred to as a printer) that is a recording apparatus including a liquid ejection head 2 according to an embodiment of the present disclosure.
- (B) is a schematic plan view.
- the printer 1 moves the print paper P relative to the liquid ejection head 2 by transporting the print paper P as a recording medium from the transport roller 80 ⁇ / b> A to the transport roller 80 ⁇ / b> B.
- the control unit 88 controls the liquid ejection head 2 based on image and character data, ejects liquid toward the recording medium P, causes droplets to land on the printing paper P, and prints on the printing paper P. Record such as.
- the liquid discharge head 2 is fixed to the printer 1, and the printer 1 is a so-called line printer.
- the printer 1 is a so-called line printer.
- an operation of moving the liquid ejection head 2 by reciprocating in a direction intersecting the conveyance direction of the printing paper P, for example, a direction substantially orthogonal, and the printing paper P There is a so-called serial printer that alternately conveys.
- the printer 1 has a flat head mounting frame 70 (hereinafter sometimes simply referred to as a frame) fixed so as to be substantially parallel to the printing paper P.
- the frame 70 is provided with 20 holes (not shown), and the 20 liquid discharge heads 2 are mounted in the respective hole portions, and the portion of the liquid discharge head 2 that discharges the liquid is the printing paper P. It has come to face.
- the distance between the liquid ejection head 2 and the printing paper P is, for example, about 0.5 to 20 mm.
- the five liquid ejection heads 2 constitute one head group 72, and the printer 1 has four head groups 72.
- the liquid discharge head 2 has a long and narrow shape in the direction from the front to the back in FIG. 1A and in the vertical direction in FIG. This long direction is sometimes called the longitudinal direction.
- the three liquid ejection heads 2 are arranged along a direction that intersects the conveyance direction of the printing paper P, for example, a substantially orthogonal direction, and the other two liquid ejection heads 2 are conveyed.
- One of the three liquid ejection heads 2 is arranged at a position shifted along the direction.
- the liquid discharge heads 2 are arranged so that the printable range of each liquid discharge head 2 is connected in the width direction of the print paper P (in the direction intersecting the conveyance direction of the print paper P) or the ends overlap. Thus, printing without gaps in the width direction of the printing paper P is possible.
- the four head groups 72 are arranged along the conveyance direction of the recording paper P.
- a liquid, for example, ink is supplied to each liquid ejection head 2 from a liquid tank (not shown).
- the liquid discharge heads 2 belonging to one head group 72 are supplied with the same color ink, and the four head groups 72 can print four color inks.
- the colors of ink ejected from each head group 72 are, for example, magenta (M), yellow (Y), cyan (C), and black (K).
- a color image can be printed by printing such ink under the control of the control unit 88.
- the number of liquid discharge heads 2 mounted on the printer 1 may be one if it is a single color and the range that can be printed by one liquid discharge head 2 is printed.
- the number of liquid ejection heads 2 included in the head group 72 and the number of head groups 72 can be changed as appropriate according to the printing target and printing conditions. For example, the number of head groups 72 may be increased in order to perform multicolor printing. Also, if a plurality of head groups 72 that print in the same color are arranged and printed alternately in the transport direction, the transport speed can be increased even if the liquid ejection heads 2 having the same performance are used. Thereby, the printing area per time can be increased. Alternatively, a plurality of head groups 72 for printing in the same color may be prepared and arranged so as to be shifted in a direction crossing the transport direction, so that the resolution in the width direction of the print paper P may be increased.
- a liquid such as a coating agent may be printed for surface treatment of the printing paper P.
- the printer 1 performs printing on the printing paper P that is a recording medium.
- the printing paper P is wound around the paper feed roller 80A, passes between the two guide rollers 82A, passes through the lower side of the liquid ejection head 2 mounted on the frame 70, and thereafter It passes between the two conveying rollers 82B and is finally collected by the collecting roller 80B.
- the printing paper P is transported at a constant speed by rotating the transport roller 82 ⁇ / b> B and printed by the liquid ejection head 2.
- the collection roller 80B winds up the printing paper P sent out from the conveyance roller 82B.
- the conveyance speed is, for example, 50 m / min.
- Each roller may be controlled by the controller 88 or may be manually operated by a person.
- the recording medium may be a roll-like cloth other than the printing paper P. Further, instead of directly transporting the printing paper P, the printer 1 may transport the transport belt directly and transport the recording medium placed on the transport belt. By doing so, sheets, cut cloth, wood, tiles and the like can be used as the recording medium. Furthermore, a wiring pattern of an electronic device may be printed by discharging a liquid containing conductive particles from the liquid discharge head 2. Still further, the chemical may be produced by discharging a predetermined amount of liquid chemical agent or liquid containing the chemical agent from the liquid discharge head 2 toward the reaction container or the like and reacting.
- a position sensor, a speed sensor, a temperature sensor, and the like may be attached to the printer 1, and the control unit 88 may control each part of the printer 1 according to the state of each part of the printer 1 that can be understood from information from each sensor.
- the temperature of the liquid discharge head 2, the temperature of the liquid in the liquid tank, the pressure applied by the liquid in the liquid tank to the liquid discharge head 2, etc. affect the discharge characteristics (discharge amount, discharge speed, etc.) of the discharged liquid.
- the drive signal for ejecting the liquid may be changed according to the information.
- FIG. 2 is a plan view of the head main body 2a.
- FIG. 3 is an enlarged view of a region surrounded by a two-dot chain line in FIG. 2, and a part of the flow paths is omitted for explanation.
- FIG. 4 is an enlarged view of the same region as FIG. 3, and is a diagram in which some flow paths different from FIG. 3 are omitted for explanation. 2 to 4, for easy understanding of the drawings, the manifold 5, the discharge hole 8, the pressurizing chamber 10, and the like that are to be drawn by broken lines below the piezoelectric actuator substrate 21 are drawn by solid lines.
- 5A is a longitudinal sectional view taken along the line VV in FIG. 3, and
- FIG. 5B is an enlarged longitudinal sectional view of a part of the plate in FIG. 5A.
- the liquid discharge head 2 may include a metal casing, a driver IC, a wiring board and the like in addition to the head main body 2a.
- the head main body 2a includes a flow path member 4 and a piezoelectric actuator substrate 21 in which a displacement element 30 as a pressurizing unit is built.
- the flow path member 4 constituting the head body 2 a includes a manifold 5, a plurality of pressurizing chambers 10 connected to the manifold 5, and a plurality of discharge holes 8 respectively connected to the plurality of pressurizing chambers 10. Yes.
- the pressurizing chamber 10 is opened on the upper surface of the flow path member 4, and the upper surface of the flow path member 4 is a pressurizing chamber surface 4-2. Further, an opening 5a connected to the manifold 5 is opened on the upper surface of the flow path member 4, and liquid is supplied from the opening 5a.
- the piezoelectric actuator substrate 21 including the displacement element 30 is joined to the upper surface of the flow path member 4, and each displacement element 30 is disposed on the pressurizing chamber 10.
- the piezoelectric actuator substrate 21 is connected to a signal transmission unit such as an FPC (Flexible Printed Circuit) for supplying a signal to each displacement element 30.
- FPC Flexible Printed Circuit
- the manifold 5 has an elongated shape extending along the longitudinal direction of the flow path member 4, and openings 5 a of the manifold 5 are formed on the upper surface of the flow path member 4 at both ends thereof.
- the four manifolds 5 are independent of each other.
- the flow path member 4 is formed by two-dimensionally expanding a plurality of pressurizing chambers 10.
- the pressurizing chamber 10 is a hollow region having a substantially rhombic planar shape with rounded corners.
- the pressurizing chamber 10 opens to the pressurizing chamber surface 4-2 that is the upper surface of the flow path member 4.
- the pressurizing chamber 10 is connected to one manifold 5 via an individual supply channel 14.
- two pressurizing chamber rows 11, which are columns of pressurizing chambers 10 connected to the manifold 5 are arranged on each side of the manifold 5, for a total of four rows. Accordingly, 16 pressurizing chamber rows 11 are arranged as a whole.
- the intervals in the longitudinal direction of the pressurizing chambers 10 in the respective pressurizing chamber rows 11 are the same, and the interval is 37.5 dpi.
- the pressurizing chamber 10 at the end of each pressurizing chamber row 11 is a dummy and is not connected to the manifold 5. By this dummy, the structure around the pressurizing chamber 10 one inner side from the end and the rigidity affected by it are made closer to the structure of the other pressurizing chamber 10 and the rigidity affected by it. The difference can be reduced.
- the pressurizing chambers 10 belonging to each pressurizing chamber row 11 are arranged in a staggered manner between two adjacent pressurizing chamber rows 11, and the corners of the adjacent pressurizing chambers 10 are alternately arranged. It has become so.
- One pressurizing chamber group is constituted by four pressurizing chamber rows 11 connected to one manifold 5, and there are four pressurizing chamber groups.
- the relative arrangement of the pressurizing chambers 10 in each pressurizing chamber group is the same, and each pressurizing chamber group is arranged slightly shifted in the longitudinal direction of the head body 2a.
- pressurizing chambers 10 are arranged over almost the entire surface of the upper surface of the flow path member 4 in a region facing the piezoelectric actuator substrate 21, although there are some widened portions such as between the pressurizing chamber groups. . Further, the opening of each pressurizing chamber 10 is closed by bonding the piezoelectric actuator substrate 21 to the upper surface of the flow path member 4.
- a descender 16 connected to the discharge hole 8 opened in the discharge surface 4-1 on the lower surface of the flow path member 4 extends from a corner portion of the pressurizing chamber 10 facing the corner portion where the individual supply flow path 14 is connected. ing.
- the descender 16 extends in the direction of extending the diagonal line of the pressurizing chamber 10 in plan view. That is, the arrangement of the discharge holes 8 and the arrangement of the pressurizing chambers 10 in the longitudinal direction are the same.
- the pressurizing chambers 10 are arranged at an interval of 37.5 dpi, and the pressurizing chambers 10 connected to one manifold 5 as a whole have an interval of 150 dpi in the longitudinal direction.
- the pressurizing chambers 10 connected to the four manifolds 5 are displaced in the longitudinal direction at intervals corresponding to 600 dpi, the pressurizing chambers 10 are formed at intervals of 600 dpi in the longitudinal direction as a whole. Yes.
- the arrangement of the discharge holes 8 in the longitudinal direction is the same as that of the pressurizing chamber 10, the distance in the longitudinal direction of the discharge holes 8 is also 600 dpi.
- each manifold 5 is within the range of R of the virtual straight line shown in FIG. That is, four discharge holes 8 connected to, that is, a total of 16 discharge holes 8 are equally spaced at 600 dpi. Accordingly, by supplying the same color ink to all the manifolds 5, an image can be formed with a resolution of 600 dpi in the longitudinal direction as a whole.
- the four rows of discharge holes 8 connected to one manifold 5 are equally spaced at 150 dpi in the range of the virtual straight line R.
- Individual electrodes 25 are formed at positions facing the pressurizing chambers 10 on the upper surface of the piezoelectric actuator substrate 21.
- the individual electrode 25 includes an individual electrode main body 25a that is slightly smaller than the pressurizing chamber 10 and has a shape substantially similar to the pressurizing chamber 10, and an extraction electrode 25b that is extracted from the individual electrode main body 25a.
- the individual electrode 25 constitutes an individual electrode row and an individual electrode group.
- a common electrode surface electrode 28 electrically connected to the common electrode 24 is formed on the upper surface of the piezoelectric actuator substrate 21.
- the common electrode surface electrodes 28 are formed in two rows along the longitudinal direction at the central portion of the piezoelectric actuator substrate 21 in the lateral direction, and are formed in one row along the lateral direction near the end in the longitudinal direction. ing. Although the illustrated common electrode surface electrode 28 is intermittently formed on a straight line, it may be formed continuously on a straight line.
- Two signal transmission units are arranged and bonded to the piezoelectric actuator substrate 21 from the two long sides of the piezoelectric actuator substrate 21 toward the center.
- the common electrode surface electrode 28 is connected at the end of the signal transmission unit (the tip and the longitudinal end of the piezoelectric actuator substrate 21), and the common electrode surface electrode 28 and the common electrode connection electrode formed thereon are provided. Since the area is larger than that of the extraction electrode 25b and the connection electrode 26 formed on the extraction electrode 25b, the signal transmission part can be hardly separated from the end.
- the discharge hole 8 is arranged at a position avoiding the area facing the manifold 5 arranged on the lower surface side of the flow path member 4. Further, the discharge hole 8 is disposed in a region facing the piezoelectric actuator substrate 21 on the lower surface side of the flow path member 4. These discharge holes 8 occupy a region having almost the same size and shape as the piezoelectric actuator substrate 21 as a group, and the displacement elements 30 of the corresponding piezoelectric actuator substrate 21 are displaced to displace the discharge holes 8 from the discharge holes 8. Droplets can be ejected.
- the flow path member 4 included in the head body 2a has a laminated structure in which a plurality of plates are laminated. These plates are a cavity plate 4a, a base plate 4b, an aperture plate 4c, a supply plate 4d, manifold plates 4e to 4g, a cover plate 4h, and a nozzle plate 4i in this order from the upper surface of the flow path member 4. Many holes and grooves are formed in these plates. Since the thickness of each plate is about 10 to 300 ⁇ m, the formation accuracy of the holes and grooves to be formed can be increased. Each plate is aligned and laminated so that these holes and grooves communicate with each other to form a flow path such as the individual flow path 12 and the manifold 5.
- the pressurizing chamber 10 is on the upper surface of the flow path member 4, the manifold 5 is on the inner lower surface side, the discharge holes 8 are on the lower surface, and the parts constituting the individual flow path 12 are close to each other in different positions.
- the manifold 5 and the discharge hole 8 are connected via the pressurizing chamber 10.
- the plates 4a to i are laminated with an adhesive.
- the thickness of the adhesive layer is about 0.1 to 3 ⁇ m.
- the adhesive layer is omitted.
- An adhesive escape groove 19 and an adhesive escape hole 18 are arranged around the hole and groove serving as a flow path. These will be described in detail later.
- the holes formed in the plates 4a to i in the flow path member 4 will be described. These holes include the following.
- the first is the pressurizing chamber 10 formed in the cavity plate 4a.
- This communication hole is formed in each plate from the base plate 4b (specifically, the inlet of the pressurizing chamber 10) to the supply plate 4c (specifically, the outlet of the manifold 5).
- the individual supply flow path 14 is a portion formed in the aperture plate 4c where the cross-sectional area of the flow path is small, and includes an aperture 6 that is long in one direction in plan view.
- the descender 16 which is a flow path communicating from the other end of the pressurizing chamber 10 to the discharge hole 8.
- the descender 16 is formed on each plate from the base plate 4b (specifically, the outlet of the pressurizing chamber 10) to the nozzle plate 4i (specifically, the discharge hole 8).
- the first to fourth communication holes are connected to each other to form an individual flow path 12 from the liquid inlet (manifold 5 outlet) to the discharge hole 8 from the manifold 5.
- the liquid supplied to the manifold 5 is discharged from the discharge hole 8 through the following path. First, from the manifold 5, it passes through the individual supply channel 14 and reaches one end of the aperture 6. Next, it proceeds horizontally along the extending direction of the restriction 6 and reaches the other end of the restriction 6. From there, it reaches one end of the pressurizing chamber 10 upward. Furthermore, it progresses horizontally along the extending direction of the pressurizing chamber 10 and reaches the other end of the pressurizing chamber 10. From there, while moving little by little in the descender 16 in the horizontal direction, it proceeds mainly downward and proceeds to the discharge hole 8 opened in the lower surface.
- the piezoelectric actuator substrate 21 has a common electrode 24 made of a metal material such as Ag—Pd and an individual electrode 25 made of a metal material such as Au.
- the common electrode 24 has a thickness of about 2 ⁇ m, and the individual electrode 25 has a thickness of about 1 ⁇ m.
- the individual electrodes 25 are respectively arranged at positions facing the pressurizing chambers 10 on the upper surface of the piezoelectric actuator substrate 21.
- the individual electrode 25 has a planar shape slightly smaller than that of the pressurizing chamber main body 10a and has a shape substantially similar to the pressurizing chamber main body 10a, and an extraction electrode drawn from the individual electrode main body 25a. 25b.
- a connection electrode 26 is formed at a portion of one end of the extraction electrode 25 b that is extracted outside the region facing the pressurizing chamber 10.
- the connection electrode 26 is a conductive resin containing conductive particles such as silver particles, and is formed with a thickness of about 5 to 200 ⁇ m.
- the connection electrode 26 is electrically joined to an electrode provided in the signal transmission unit.
- a common electrode surface electrode 28 is formed on the upper surface of the piezoelectric actuator substrate 21.
- the common electrode surface electrode 28 and the common electrode 24 are electrically connected through a through conductor (not shown) disposed in the piezoelectric ceramic layer 21b.
- a drive signal is supplied to the individual electrode 25 from the control unit 88 through the signal transmission unit.
- the drive signal is supplied in a constant cycle in synchronization with the conveyance speed of the print medium P.
- the common electrode 24 is formed over almost the entire surface in the area between the piezoelectric ceramic layer 21b and the piezoelectric ceramic layer 21a. That is, the common electrode 24 extends so as to cover all the pressurizing chambers 10 in the region facing the piezoelectric actuator substrate 21.
- the common electrode 24 is connected to the common electrode surface electrode 28 formed on the piezoelectric ceramic layer 21b so as to avoid the electrode group composed of the individual electrodes 25 through via holes formed through the piezoelectric ceramic layer 21b. ing.
- the common electrode 24 is grounded and held at the ground potential.
- the common electrode surface electrode 28 is directly or indirectly connected to the control unit 88 in the same manner as the plurality of individual electrodes 25.
- a portion sandwiched between the individual electrode 25 and the common electrode 24 of the piezoelectric ceramic layer 21b is polarized in the thickness direction, and becomes a displacement element 30 having a unimorph structure that is displaced when a voltage is applied to the individual electrode 25.
- a displacement element 30 having a unimorph structure that is displaced when a voltage is applied to the individual electrode 25.
- the control unit 88 sets the individual electrode 25 to a predetermined positive or negative potential with respect to the common electrode 24 so that the electric field and the polarization are in the same direction, the portion sandwiched between the electrodes of the piezoelectric ceramic layer 21b. (Active part) contracts in the surface direction.
- the piezoelectric ceramic layer 21a which is an inactive layer, is not affected by an electric field, so that it does not spontaneously shrink and tries to restrict deformation of the active portion.
- the displacement element 30 is driven (displaced) by a drive signal supplied to the individual electrode 25 through a driver IC or the like under the control of the control unit 88.
- liquid can be ejected by various driving signals.
- strike driving method will be described.
- the individual electrode 25 is set to a potential higher than the common electrode 24 (hereinafter referred to as a high potential) in advance, and the individual electrode 25 is once set to the same potential as the common electrode 24 (hereinafter referred to as a low potential) every time there is a discharge request. Thereafter, the potential is set again at a predetermined timing. Thereby, at the timing when the individual electrode 25 becomes low potential, the piezoelectric ceramic layers 21b and 21a return to the original (flat) shape (beginning), and the volume of the pressurizing chamber 10 is in the initial state (the potentials of both electrodes are different). Increase compared to the state). As a result, a negative pressure is applied to the liquid in the pressurizing chamber 10.
- the liquid in the pressurizing chamber 10 starts to vibrate with the natural vibration period. Specifically, first, the volume of the pressurizing chamber 10 begins to increase, and the negative pressure gradually decreases. Next, the volume of the pressurizing chamber 10 becomes maximum and the pressure becomes almost zero. Next, the volume of the pressurizing chamber 10 begins to decrease, and the pressure increases. Thereafter, the individual electrode 25 is set to a high potential at a timing at which the pressure becomes substantially maximum. Then, the first applied vibration overlaps with the next applied vibration, and a larger pressure is applied to the liquid. This pressure propagates through the descender and discharges the liquid from the discharge hole 8.
- a droplet can be ejected by supplying to the individual electrode 25 a pulse driving signal that is set to a low potential for a certain period of time with a high potential as a reference.
- this pulse width is AL (Acoustic Length), which is half of the natural vibration period of the liquid in the pressurizing chamber 10, in principle, the liquid discharge speed and amount can be maximized.
- AL Acoustic Length
- the natural vibration period of the liquid in the pressurizing chamber 10 is greatly affected by the physical properties of the liquid and the shape of the pressurizing chamber 10, but besides that, the physical properties of the piezoelectric actuator substrate 21 and the flow path connected to the pressurizing chamber 10 Also affected by the characteristics of.
- the flow path member 4 is configured by laminating plates 4a to 4i with adhesives. Since holes and grooves serving as flow paths are arranged in the plates 4a to i, a part of the adhesive may flow into the holes and grooves when being laminated. If a large amount of adhesive flows, the flow path may be clogged, and even if it does not increase until the volume is clogged, the cross-sectional area of the flow path will change and the flow characteristics will change, so the liquid discharge characteristics will fluctuate. there's a possibility that.
- the escape hole 18 and the relief groove 19 are arranged around the hole or groove that becomes the flow path.
- the escape hole 18 and the escape groove 19 are basically depressions formed in the plates 4a to i, and are formed by half-etching the plates 4a to i or the like. However, the escape hole 18 and the escape groove 19 may pass through the plates 4a to 4i, and the one including such a form is referred to as the escape hole 18 and the escape groove 19.
- the adhesive flows into the flow path from the entire periphery of the flow path, the flow of the adhesive into the flow path can be suppressed by arranging the escape hole 18 and the escape groove 19 so as to surround the flow path.
- the planar shape of the relief hole 18 is basically a circular shape or a polygonal shape, and the ratio of the length in the longitudinal direction to the length in the short direction of the relief hole 18 is 3 or less, preferably 2 or less.
- the ratio of the length in the longitudinal direction to the length in the short direction of the escape groove 19 is larger than that of the escape hole 18.
- the following two actions influence the suppression of the flow of the adhesive into the flow path by the escape hole 18 and the escape groove 19.
- the first function is that the adhesive does not flow beyond the relief hole 18 and the relief groove 19.
- the adhesive is usually not supplied in such a large amount that the relief hole 18 and the relief groove 19 are filled with the adhesive. Therefore, the adhesive once flowing into the escape hole 18 and the escape groove 19 flows almost over the escape hole 18 and the escape groove 19 and hardly flows into the flow path.
- the adhesive When the periphery of the flow path is surrounded by the escape groove 19 without any break, the adhesive hardly flows from the outside of the escape groove 19. As a result, the adhesive that may flow into the flow path is only the adhesive supplied to the bonding margin in the region surrounded by the escape groove 19. That is, such a structure is highly effective in suppressing the flow of the adhesive into the flow path. However, with such a structure, when the escape groove 19 and the flow path are connected and a leak occurs, the escape groove 19 extends long, so that the fluctuation of the flow path characteristics becomes large.
- the second action is that the adhesive supplied to the bonding margin between the relief hole 18 and the relief groove 19 and the flow path is mostly the relief hole 18, the relief groove 19 and the flow path. It flows into something close to the distance. By this action, the amount of the adhesive flowing into the flow path can be reduced without letting the periphery of the flow path escape and being surrounded by the groove 19 without any breaks.
- FIG. 6A is a plan view of the two-dot chain line portion of FIG. 4 on the plate 4e.
- a through-hole that becomes the manifold 5 is opened in the plate 4e.
- two discharge hole rows 9 are arranged on both sides of one manifold 5.
- the plate 4e is slightly displaced in the plane direction, but a descender 16 penetrating the plate 4e is disposed at substantially the same position as the discharge hole 8. That is, in the plate 4e, two rows of holes serving as descenders 16 (hereinafter sometimes referred to as descender holes 16) are arranged on both sides of the manifold 5.
- descender holes 16 two rows of holes serving as descenders 16
- a circular relief hole 18 is disposed so as to surround the descender hole 16 and is approximately half the thickness of the plate 4e.
- an escape groove 19 having a depth about half the thickness of the plate 4e is disposed between the two rows of descender holes 16. Further, in the range of the manifold 5 where the descender hole 16 is not disposed, the escape groove 19 is disposed along the outer edge of the manifold 5.
- the relief holes 18 are arranged around those having a small opening area, and the relief grooves 19 are arranged around those having a large opening area. More specifically, in the holes constituting the individual flow path 12 such as the descender 16, the escape holes 18 are arranged around the holes where the liquid flows in the stacking direction of the plates 4a to 4i. In the flow path in which the liquid flows in the laminating direction, there is a high possibility that the liquid will be connected to the surrounding escape hole 18 or the escape groove 19 due to misalignment or the like. .
- the descender 16 is a flow path that connects the pressurizing chamber 10 and the discharge hole 8, and is a flow path that has a particularly large influence on the discharge characteristics when the flow path characteristics fluctuate. By reducing fluctuations in the flow path characteristics of the descender 16, it is possible to reduce variations in ejection characteristics.
- the annular relief groove 19 is arranged around the descender hole 16, the discharge characteristics when the descender 16 and the escape groove 19 are connected due to misalignment of the plates 4a to 4i or local adhesion failure. Fluctuation increases.
- the escape groove 19 functions as a flow path added to the descender 16, and the flow characteristics change, thereby changing the discharge characteristics. Even if the liquid does not enter the escape groove 19, the air remaining in the escape groove 19 works like an air damper, so that the discharge characteristics change.
- the substantially same interval means that the distance from the outer edge of the descender hole 16 of the nearest relief hole 18 is 50% or more with respect to the distance from the outer edge of the descender hole 16 of the farthest escape hole 18; More preferably, it means 80% or more, particularly 90% or more.
- the relief hole 18 may have a shape extending along the circumference of a concentric circle with the descender hole 16 as the center. However, when the ratio of the longitudinal direction of the relief hole 18 to the short direction increases, A smaller ratio is desirable because the effect is greater.
- the ratio is preferably 1, so that it is not long in a specific direction, and is preferably circular.
- the escape holes 18 In order to suppress the flow of the adhesive from the outer periphery of the descender hole 16 by arranging the escape holes 18 so as to surround the descender hole 16, basically, three or more escape holes 18 are arranged around the descender hole 16. However, when there are other flow paths or the like nearby, it may be necessary to arrange only two escape holes 18. For example, in the descender hole 16 close to the manifold 5 in FIG. 6A, the manifold 5 is arranged near the lower side of the descender hole in the figure, and therefore the relief hole 18 is arranged in the direction in which the manifold 5 is arranged. The need to place is low. In such a case, the two escape holes 18 and the hole to be the manifold 5 can be disposed so as to surround the descender hole 16.
- the opening area of the escape hole 18 is smaller than the opening area of the descender 16, fluctuations in the flow path characteristics of the descender 16 when the descender 16 and the escape hole 18 are connected can be reduced.
- the escape hole 18 When the escape hole 18 is arranged at substantially the same interval so as to surround the descender hole 16, another escape hole 18 is arranged on the outer side of the escape hole 18 as shown in FIG. Is preferred.
- the outer escape hole 18 is arranged so as to overlap the gap between the adjacent escape holes 18 of the inner escape holes 18 when viewed from the descender hole 16.
- the first action described above is also caused by the escape hole 18, but unlike the escape groove 19, the escape hole 18 is not arranged around the descender hole 16 without a break. For this reason, the adhesive may flow into the descender hole 16 from between the adjacent inner escape holes 18. If the outer escape holes 18 are arranged as described above, it is possible to prevent the adhesive from flowing into the dechender holes 16 from between the adjacent inner escape holes 18.
- FIG. 5 (b) is an enlarged longitudinal sectional view of the plates 4e to 4g in FIG. 5 (a).
- a descender hole 16 is disposed in each of the plates 4e to 4g.
- the descender 16 is connected from the top to the bottom of FIG. 5B, and is arranged so that it gradually shifts from the top to the bottom, that is, from the plate 4e to the plate 4g.
- FIG. 5B shows a state in which the plate 4f is shifted to the left and stacked with respect to the design.
- the plate 4f is a first plate 4f, and a first descender hole 16A that is a descender hole 16 and a first escape hole 18A that is a relief hole 18 are arranged on the first plate 4f.
- the plate 4e is the second plate 4e, and the second descender hole 16B that is the descender hole 16 and the second escape hole 18B that is the escape hole 18 are arranged on the second plate 4e.
- FIG. 6B shows the second descender hole 16B and the second escape hole 18B of the second plate 4e, the first descender hole 16A and the first escape hole 18A of the first plate 4f, and the second plate 4e side. That is, it is a plan view seen from above.
- FIG. 6 (b) is drawn larger than FIG. 6 (a).
- the design position of the first descender hole 16A of the first plate 4f is the position of the two-dot chain line of 16A-1. Since the first plate 4f has been laminated to the left of the design, the state is as shown in FIG. 5B.
- the first relief hole 18A of the first plate 4f visible in the cross section of FIG. 5B and the descender 16 are connected.
- the second escape hole 18B is disposed at the position A of the second plate 4e, the descender 16 is also connected to the escape hole 18B at the position A.
- A is a position opposite to the first escape hole 18A with respect to the first hole descender hole 16A. By not disposing the escape hole 18B at the opposite position A, the occurrence of leak can be reduced as described above. It is preferable not to arrange the second escape holes 18B in the opposite positions A corresponding to all the first escape holes 18A, as shown in FIG.
- the escape holes 18 are arranged in a rotational symmetry of n times (n is an odd number of 3 or more) with respect to the descender hole 16, and are stacked adjacent to each other. It is preferable to arrange the relief holes 18 of the plate at positions where they overlap each other. With such an arrangement, even if the laminating position of the plates is shifted and the descender 16 and one escape hole 18 are connected, the escape hole 18 is not arranged at the opposite position A, so there is a leak. Not likely to occur. Such an arrangement is particularly effective in a structure in which three or more holes through which liquid flows in the stacking direction are continuously connected, such as the descender 16.
- FIG. 6C is a plan view of the third escape hole 18C and the fourth escape hole 18D, which are the descender hole 16 and the escape hole 18, according to another embodiment of the present disclosure.
- Such a structure can be used, for example, instead of the design around the descender hole 16 of FIG. 6C has a larger magnification than FIG. 6A, and the actual size of the descender hole 16 shown is the same.
- Descender hole 16 more specifically, the gap between adjacent third relief holes 18C when viewed from the area center of gravity of descender hole 16 is in the range of B.
- the fourth relief hole 18D is disposed outside the third relief hole 18C, and when viewed from a part of the fourth relief hole 18D and the descender hole 16, the gap B between the third relief holes 18C and They are arranged so as to overlap.
- the adhesive supplied between the adjacent third relief holes 18 ⁇ / b> C and the adhesive supplied outside thereof to flow into the descender hole 16.
- the fourth escape hole 18D overlaps the entire gap B between the third escape holes 18C, the adhesive can be more difficult to flow into the descender hole 16.
- the adhesive when viewed from the descender hole 16, if the fourth relief hole 18D is larger than the third relief hole 18C, the adhesive can be more difficult to flow into the descender hole 16.
- Relief groove 21 Piezoelectric actuator Substrate 21a Piezoelectric ceramic layer (vibrating plate) 21b ... Piezoceramic layer 24 ... Common electrode 25 ... Individual electrode 25a ... Individual electrode body 25b ... Extraction electrode 26 ... Connection electrode 27 ... Dummy connection electrode 28 ... Common Electrode surface electrode 30 ... Displacement element (pressure part) 70 ... (head mounted) frame 72 ... head group 80A ... paper feed roller 80B ... collection roller 82A ... guide roller 82B ... transport roller 88 ... control unit A ... Opposite area (relief hole) P: Printing paper
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Abstract
Description
2・・・液体吐出ヘッド
2a・・・ヘッド本体
4・・・流路部材
4a~i・・・(流路部材の)プレート
4-1・・・吐出孔面
4-2・・・加圧室面
5・・・マニホールド(共通流路)
5a・・・開口
6・・・しぼり
8・・・吐出孔
9・・・吐出孔行
10・・・加圧室
11・・・加圧室行
12・・・個別流路
14・・・個別供給流路
16・・・ディセンダ(ディセンダとなるディセンダ孔)
18・・・逃がし穴
18A・・・第1逃がし穴
18B・・・第2逃がし穴
18C・・・第3逃がし穴
18D・・・第4逃がし穴
19・・・逃がし溝
21・・・圧電アクチュエータ基板
21a・・・圧電セラミック層(振動板)
21b・・・圧電セラミック層
24・・・共通電極
25・・・個別電極
25a・・・個別電極本体
25b・・・引出電極
26・・・接続電極
27・・・ダミー接続電極
28・・・共通電極用表面電極
30・・・変位素子(加圧部)
70・・・(ヘッド搭載)フレーム
72・・・ヘッド群
80A・・・給紙ローラ
80B・・・回収ローラ
82A・・・ガイドローラ
82B・・・搬送ローラ
88・・・制御部
A・・・(逃がし穴の)反対領域
P・・・印刷用紙
Claims (11)
- 液体が流れる流路となる孔を有する複数のプレートが接着剤を介して積層されており、
少なくとも1つの前記プレートには、前記孔から略同じ間隔を空けて、複数の接着剤の逃がし穴が、当該孔を囲むように配置されていることを特徴とする流路部材。 - 複数の前記逃がし穴の開口面積が、当該孔の開口面積より小さいことを特徴とする請求項1に記載の流路部材。
- 前記孔の周囲に配置されている前記逃がし穴が、回転対称に配置されていることを特徴とする請求項1または2に記載の流路部材。
- 前記孔である第1孔と、前記逃がし穴である第1逃がし穴が配置されている前記プレートを第1プレートとし、
該第1プレートに積層されていて、前記孔である第2孔と、前記逃がし穴である第2逃がし穴が配置されている前記プレートを第2プレートとするとき、
前記第1孔と前記第2孔とは繋がっており、
前記第2逃がし穴は、前記第2プレートの前記第1プレート側の面に配置されており、
平面視したとき、前記第1孔に対する、前記第1逃がし穴と反対の位置には、前記第2逃がし穴が配置されていないことを特徴とする請求項1~3のいずれかに記載の流路部材。 - 前記孔である第1孔と、前記逃がし穴である第1逃がし穴が配置されている前記プレートを第1プレートとし、
該第1プレートに積層されていて、前記孔である第2孔と、前記逃がし穴である第2逃がし穴が配置されている前記プレートを第2プレートとするとき、
前記第1孔と前記第2孔とは繋がっており、
前記第1逃がし穴が、n回の回転対称(nは3以上の奇数)に配置されており、
平面視したとき、前記第2逃がし穴は、前記第1逃がし穴と重なる位置に配置されていることを特徴とする請求項1~3のいずれかに記載の流路部材。 - 前記プレートには、前記孔の周囲に配置されている前記逃がし穴である第3逃がし穴よりも外側に、他の前記逃がし穴である第4逃がし穴が配置されていることを特徴とする請求項1~5のいずれかに記載の流路部材。
- 前記孔から見て、前記第4逃がし穴は、隣り合って配置されている2つの前記第3逃がし穴の間の間隙と重なる位置に配置されていることを特徴とする請求項6に記載の流路部材。
- 前記孔から見たときに、前記第4逃がし穴の大きさが、前記第3逃がし穴の大きさよりも大きいことを特徴とする請求項6または7に記載の流路部材。
- 前記逃がし穴の開口が円形状であることを特徴とする請求項1~8のいずれかに記載の流路部材。
- 請求項1~9のいずれかに記載の流路部材と、前記流路内の液体を加圧する加圧部とを備えていることを特徴とする液体吐出ヘッド。
- 請求項10に記載の液体吐出ヘッドと、記録媒体を前記液体吐出ヘッドに対して搬送する搬送部と、前記液体吐出ヘッドを制御する制御部とを備えていることを特徴とする記録装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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US15/551,533 US10173423B2 (en) | 2015-02-18 | 2016-02-17 | Passage member, liquid discharge head using same, and recording device |
CN201680009711.2A CN107249891B (zh) | 2015-02-18 | 2016-02-17 | 流路构件、使用该流路构件的液体喷出头及记录装置 |
JP2017500708A JP6427259B2 (ja) | 2015-02-18 | 2016-02-17 | 流路部材、およびそれを用いた液体吐出ヘッドならびに記録装置 |
EP16752503.9A EP3243664B1 (en) | 2015-02-18 | 2016-02-17 | Passage member, liquid discharge head using same, and recording device |
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JP2015029723 | 2015-02-18 | ||
JP2015-029723 | 2015-02-18 |
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JP2020199689A (ja) * | 2019-06-10 | 2020-12-17 | 株式会社リコー | 液体吐出ヘッド、ヘッドモジュール、ヘッドユニット、液体吐出ユニット、液体を吐出する装置 |
JPWO2021132676A1 (ja) * | 2019-12-27 | 2021-07-01 |
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CN112122333B (zh) * | 2020-09-03 | 2022-04-15 | 江苏艾斯蔻环境工程科技有限公司 | 一种重金属污染酸性土壤的修复方法 |
KR20220072366A (ko) * | 2020-11-25 | 2022-06-02 | 에스케이하이닉스 주식회사 | 관통 전극을 포함하는 반도체 칩, 및 이를 포함하는 반도체 패키지 |
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JPWO2016133117A1 (ja) | 2017-11-30 |
US20180037028A1 (en) | 2018-02-08 |
EP3243664B1 (en) | 2019-09-25 |
CN107249891B (zh) | 2019-03-12 |
EP3243664A4 (en) | 2018-02-14 |
US10173423B2 (en) | 2019-01-08 |
EP3243664A1 (en) | 2017-11-15 |
CN107249891A (zh) | 2017-10-13 |
JP6427259B2 (ja) | 2018-11-21 |
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