WO2016136005A1 - 液体吐出ヘッド用の流路部材、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
液体吐出ヘッド用の流路部材、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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- WO2016136005A1 WO2016136005A1 PCT/JP2015/074550 JP2015074550W WO2016136005A1 WO 2016136005 A1 WO2016136005 A1 WO 2016136005A1 JP 2015074550 W JP2015074550 W JP 2015074550W WO 2016136005 A1 WO2016136005 A1 WO 2016136005A1
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- Prior art keywords
- hole
- flow path
- plate
- opening
- path member
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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
-
- 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
- B41J2/14233—Structure of print heads with piezoelectric elements of film type, deformed by bending and disposed on a diaphragm
-
- 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
- B41J2002/14362—Assembling elements of heads
-
- 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
- B41J2002/14459—Matrix arrangement of the pressure chambers
-
- 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
- B41J2002/14475—Structure thereof only for on-demand ink jet heads characterised by nozzle shapes or number of orifices per chamber
-
- 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
- B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
- B41J2202/01—Embodiments of or processes related to ink-jet heads
- B41J2202/11—Embodiments of or processes related to ink-jet heads characterised by specific geometrical characteristics
Definitions
- the present invention relates to a flow path member for a liquid discharge head, and a liquid discharge head and a recording apparatus using the same.
- the 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.
- the liquid discharge head includes a flow path member including a plurality of discharge holes and a plurality of pressure chambers, and a piezoelectric actuator substrate including a displacement element that pressurizes the liquid in the pressure chamber.
- the flow path member is configured by laminating a plurality of plates having holes to be flow paths.
- the discharge hole is disposed on one main surface of the flow path member, and the pressurizing chamber is disposed on the other main surface of the flow path member.
- the flow path member is provided with a flow path connecting the discharge hole and the pressurizing chamber (see, for example, Patent Document 1).
- an object of the present invention is to provide a liquid discharge head flow path member that is a liquid discharge head with less fluctuation in discharge characteristics when the position of a hole in a plate serving as a flow path is shifted, and a liquid discharge using the same.
- a flow path member for a liquid discharge head is a flow path member for a liquid discharge head having a flow path including partial flow paths, and the flow path member includes a plurality of stacked flow path members.
- the third plate has a third hole that penetrates the third plate and constitutes a part of the partial flow path, and has the flow path member.
- the opening on the second plate side of the first hole and the second pre-plate of the third hole When viewed in a plan view, the opening on the second plate side of the first hole and the second pre-plate of the third hole.
- the opening on the second side has a region overlapping each other and a region not overlapping each other, and the opening on the second plate side of the first hole and the opening on the second plate side of the third hole are the second It is inside the hole.
- 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.
- a 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.
- the liquid discharge characteristics fluctuate even when the positional deviation occurs in the holes constituting the partial flow path. Can be small.
- 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 short dash line in FIG. It is the other enlarged view of the area
- (A) is a longitudinal sectional view taken along line VV in FIG. 3,
- (b) is an enlarged sectional view of a part of (a), and (c) is a part of (b). It is a top view of the flow path. It is a typical enlarged plan view of a part of a head body.
- FIG. 1A is a schematic side view of a color inkjet printer 1 (hereinafter sometimes simply referred to as a printer) which is a recording apparatus including a liquid discharge head 2 according to an embodiment of the present invention.
- (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 guide roller 82 ⁇ / b> A to the transport roller 82 ⁇ / 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 operation of moving the liquid ejection head 2 by reciprocating in the direction intersecting the transport direction of the printing paper P, for example, the 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, 75 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 showing a head main body 2a which is a main part of the liquid ejection head 2 shown in FIG.
- FIG. 3 is an enlarged plan view of a region surrounded by a one-dot chain line in FIG. 2, and is a part of the head main body 2a.
- FIG. 4 is an enlarged plan view at the same position as FIG. 3, and a part of the flow path different from FIG. 3 is omitted.
- 5A is a longitudinal sectional view taken along line VV in FIG. 3
- FIG. 5B is an enlarged sectional view of a part of FIG. 5A
- FIG. 5A is a longitudinal sectional view taken along line VV in FIG. 3
- FIG. 5B is an enlarged sectional view of a part of FIG. 5A
- FIG. 5A is a longitudinal sectional view taken along line VV in FIG. 3
- FIG. 5B is an enlarged sectional view of a part of FIG. 5A
- the liquid discharge head 2 may include a reservoir for supplying liquid to the head main body 2a and a housing in addition to the head main body 2a.
- the head body 2a includes a flow path member 4 and a piezoelectric actuator substrate 21 in which a displacement element 30 that is a pressurizing unit is formed.
- the flow path member 4 constituting the head body 2a includes a manifold 5 which is a common flow path, a plurality of pressurizing chambers 10 connected to the manifold 5, and a plurality of discharge holes respectively connected to the plurality of pressurizing chambers 10. 8 and.
- 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.
- the upper surface of the flow path member 4 has an opening 5a connected to the manifold 5, and liquid is supplied from the opening 5a.
- a piezoelectric actuator substrate 21 including a displacement element 30 is bonded 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 60 that supplies a signal to each displacement element 30.
- the outline of the vicinity of the signal transmission unit 60 connected to the piezoelectric actuator substrate 21 is indicated by a dotted line so that the two signal transmission units 60 are connected to the piezoelectric actuator substrate 21.
- the electrodes formed on the signal transmission unit 60 that are electrically connected to the piezoelectric actuator substrate 21 are arranged in a rectangular shape at the end of the signal transmission unit 60.
- the two signal transmission parts 60 are connected so that each end comes to the center part in the short direction of the piezoelectric actuator substrate 21.
- the head main body 2 a has one piezoelectric actuator substrate 21 including a plate-like flow path member 4 and a displacement element 30 bonded on the flow path member 4.
- the planar shape of the piezoelectric actuator substrate 21 is rectangular, and is arranged on the upper surface of the flow path member 4 so that the long side of the rectangle is along the longitudinal direction of the flow path member 4.
- the manifold 5 has an elongated shape extending from one end side in the longitudinal direction of the flow path member 4 to the other end side, and the opening of the manifold 5 that opens to the upper surface of the flow path member 4 at both ends thereof. 5a is formed.
- the manifold 5 is partitioned by a partition wall 15 provided at an interval in the short direction at least in the central portion in the longitudinal direction, which is an area connected to the pressurizing chamber 10.
- the partition wall 15 has the same height as the manifold 5 in the central portion in the longitudinal direction, which is a region connected to the pressurizing chamber 10, and completely separates the manifold 5 into a plurality of sub-manifolds 5b. By doing so, it is possible to provide the discharge hole 8 and the flow path connected from the discharge hole 8 to the pressurizing chamber 10 so as to overlap with the partition wall 15 in a plan view.
- Each of the divided parts of the manifold 5 may be referred to as a sub-manifold 5b.
- two manifolds 5 are provided independently, and openings 5a are provided at both ends.
- One manifold 5 is divided into eight sub-manifolds 5 b by seven partition walls 15. The width of the sub-manifold 5b is larger than the width of the partition wall 15, so that a large amount of liquid can flow through the sub-manifold 5b.
- 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 or elliptical planar shape with rounded corners.
- the pressurizing chamber 10 is connected to one sub-manifold 5b via an individual supply channel 14.
- two pressurizing chamber rows 11, which are rows of pressurizing chambers 10 connected to the sub-manifold 5b, are provided on each side of the sub-manifold 5b, for a total of two rows. Yes.
- 16 rows of pressurizing chambers 11 are provided for one manifold 5, and 32 heads of pressurizing chambers 11 are provided in the entire head body 2a.
- the intervals in the longitudinal direction of the pressurizing chambers 10 in the respective pressurizing chamber rows 11 are the same, for example, 37.5 dpi.
- One dummy pressurizing chamber 16 is provided at each end of each pressurizing chamber row 11, and two dummy pressurizing chamber rows are formed by these dummy pressurizing chambers 16.
- the dummy pressurizing chambers 16 in the dummy pressurizing chamber row are connected to the manifold 5 but are not connected to the discharge holes 8.
- dummy pressurizing chambers 16 are linearly arranged outside the 32 pressurizing chamber rows 11 (next to the first pressurizing chamber row 11 and next to the 32nd pressurizing chamber row 11).
- One dummy pressurizing chamber row is provided for each row.
- the dummy pressurizing chamber 16 in this dummy pressurizing chamber row is not connected to either the manifold 5 or the discharge hole 8.
- the structure (rigidity) around the pressurizing chamber 10 located at the periphery becomes close to the structure (rigidity) around the other pressurizing chambers 10, so The difference can be reduced.
- the influence of the difference in the surrounding structure has a large influence on the pressurizing chamber 10 adjacent to the length direction of the flow path member 4 at a short distance, and has a relatively small influence on the width direction. For this reason, although the space
- the pressurizing chambers 10 connected to the single manifold 5 are arranged in a lattice form having rows and columns along each outer side of the rectangular piezoelectric actuator substrate 21.
- the individual electrodes 25 formed on the pressurizing chamber 10 are arranged at equal distances from the outer side of the piezoelectric actuator substrate 21. Therefore, when forming the individual electrodes 25, the piezoelectric actuator substrate is formed. 21 can be hardly deformed.
- the piezoelectric actuator substrate 21 and the flow path member 4 are joined, if this deformation is large, stress may be applied to the displacement element 30 near the outer side, resulting in variations in displacement characteristics. However, by reducing the deformation, The variation can be reduced.
- the dummy pressurizing chamber row of the dummy pressurizing chamber 16 is provided outside the pressurizing chamber row 11 closest to the outer side, the influence of deformation can be made less susceptible.
- the pressurizing chambers 10 belonging to the pressurizing chamber row 11 are arranged at equal intervals, and the individual electrodes 25 corresponding to the pressurizing chamber rows 11 are also arranged at equal intervals.
- the pressurizing chamber rows 11 are arranged at equal intervals in the short direction, and the rows of the individual electrodes 25 corresponding to the pressurizing chamber rows 11 are also arranged at equal intervals in the short direction. Thereby, it is possible to eliminate a portion where the influence of the crosstalk becomes particularly large.
- the pressurizing chambers 10 are arranged in a lattice pattern, but the pressurizing chambers 10 of adjacent pressurizing chamber rows 11 may be arranged in a staggered manner so as to be positioned between each other. In this way, since the distance between the pressurizing chambers 10 belonging to the adjacent pressurizing chamber row 11 becomes longer, crosstalk can be further suppressed.
- the pressurizing chamber 10 belonging to one pressurizing chamber row 11 is added to the adjacent pressurizing chamber row 11.
- the pressure chamber 10 and the liquid discharge head 2 are arranged so as not to overlap in the longitudinal direction, crosstalk can be suppressed.
- the width of the liquid discharge head 2 is increased, so that the accuracy of the installation angle of the liquid discharge head 2 relative to the printer 1 and the use of a plurality of liquid discharge heads 2 are increased.
- the influence of the relative position accuracy of the liquid discharge head 2 on the printing result is increased. Therefore, by making the width of the partition wall 15 smaller than that of the sub-manifold 5b, the influence of the accuracy on the printing result can be reduced.
- the pressurizing chamber 10 connected to one sub-manifold 5 b forms two rows of pressurizing chamber rows 11, and the discharge holes 8 connected to the pressurizing chambers 10 belonging to one pressurizing chamber row 11 are One discharge hole row 9 is formed.
- the discharge holes 8 connected to the pressurizing chambers 10 belonging to the two pressurizing chamber rows 11 open to different sides of the sub-manifold 5b.
- two discharge hole rows 9 are provided in the partition wall 15, but the discharge holes 8 belonging to each discharge hole row 9 are connected to the sub-manifold 5 b on the side close to the discharge holes 8 in the pressurizing chamber 10. Are connected through.
- a plurality of pressurizing chambers 10 are connected to one manifold 5 to form a pressurizing chamber group. Since there are two manifolds 5, there are two pressurizing chamber groups. The arrangement of the pressurizing chambers 10 related to ejection in each pressurizing chamber group is the same, and is arranged at a position translated in the short direction. These pressurizing chambers 10 are arranged over almost the entire surface although there are portions where the gaps between the pressurizing chamber groups are slightly wide in the region facing the piezoelectric actuator substrate 21 on the upper surface of the flow path member 4. . That is, the pressurizing chamber group formed by these pressurizing chambers 10 occupies a region having almost the same shape as the piezoelectric actuator substrate 21. 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.
- This flow path extends in a direction away from the pressurizing chamber 10 in a plan view. More specifically, the pressurizing chamber 10 extends away from the direction along the long diagonal line while being shifted to the left and right with respect to that direction.
- the discharge chambers 8 can be arranged at intervals of 1200 dpi as a whole, while the pressurization chambers 10 are arranged in a lattice pattern in which the intervals within the pressurization chamber rows 11 are 37.5 dpi.
- each manifold 5 is within the range of R of the virtual straight line shown in FIG. That is, 16 discharge holes 8 connected to, and a total of 32 discharge holes 8 are equally spaced by 1200 dpi.
- an image can be formed with a resolution of 1200 dpi in the longitudinal direction as a whole.
- one discharge hole 8 connected to one manifold 5 is equally spaced at 600 dpi within the range of R of the imaginary straight line.
- 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 is disposed 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.
- the discharge hole 8 is disposed at a position avoiding the area facing the manifold 5 disposed 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 shape as the piezoelectric actuator substrate 21 as one group, and a droplet is discharged from the discharge hole 8 by displacing the displacement element 30 of the corresponding piezoelectric actuator substrate 21. Can be discharged.
- 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 4j, a cover plate 4k, and a nozzle plate 4m in order from the upper surface of the flow path member 4. A number of holes are formed in these plates. Since the thickness of each plate is about 10 to 300 ⁇ m, the formation accuracy of the holes to be formed can be increased. The thickness of the flow path member 4 is about 500 ⁇ m to 2 mm. Each plate is aligned and laminated so that these holes communicate with each other to form 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 holes formed in each plate 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 includes a squeeze 6 that is formed in the aperture plate 4c and is a portion where the cross-sectional area of the flow path is small.
- the descender 7 constitutes a flow path that communicates with the discharge hole 8 from the other end opposite to the end where the individual supply path 14 of the pressurizing chamber 10 is connected.
- the descender 7 is formed on each plate from the base plate 4b to the cover plate 4k.
- the communication holes are formed in the manifold plates 4e to 4j. Holes are formed in the manifold plates 4e to 4j so that the partition portions that become the partition walls 15 remain so as to constitute the sub-manifold 5b.
- the partition portions of the manifold plates 4e to 4j are connected to the manifold plates 4e to 4j by half-etched support portions (not shown in the drawing).
- 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 enters the individual supply flow path 14 and reaches one end of the throttle 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. The liquid that has entered the descender 7 from the pressurizing chamber 10 moves in the horizontal direction and is mainly directed downward and reaches the discharge hole 8 that is open on the lower surface, and is discharged to the outside.
- the piezoelectric actuator substrate 21 has a laminated structure composed of two piezoelectric ceramic layers 21a and 21b which are piezoelectric bodies. Each of these piezoelectric ceramic layers 21a and 21b has a thickness of about 20 ⁇ m. The thickness from the lower surface of the piezoelectric ceramic layer 21a of the piezoelectric actuator substrate 21 to the upper surface of the piezoelectric ceramic layer 21b is about 40 ⁇ m. Both of the piezoelectric ceramic layers 21 a and 21 b extend so as to straddle the plurality of pressure chambers 10.
- the piezoelectric ceramic layers 21a, 21b may, for example, strength with a dielectric, lead zirconate titanate (PZT), NaNbO 3 system, BaTiO 3 system, (BiNa) NbO 3 system, such as BiNaNb 5 O 15 system Made of ceramic material.
- PZT lead zirconate titanate
- NaNbO 3 system NaNbO 3 system
- BaTiO 3 system BaTiO 3 system
- BiNa NbO 3 system such as BiNaNb 5 O 15 system Made of ceramic material.
- the piezoelectric ceramic layer 21a functions as a vibration plate and does not necessarily have to be a piezoelectric body. Instead, other ceramic layers or metal plates that are not piezoelectric bodies may be used.
- 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 disposed 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. Further, the connection electrode 26 is electrically joined to an electrode provided in the signal transmission unit 60.
- a drive signal is supplied from the control unit 88 to the individual electrode 25 through the signal transmission unit 60.
- 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 38 formed on the piezoelectric ceramic layer 21b so as to avoid the electrode group composed of the individual electrodes 44 through a through conductor formed through the piezoelectric ceramic layer 21b. It is connected.
- the common electrode 24 is grounded via the common electrode surface electricity 38 and is held at the ground potential. Similar to the individual electrode 25, the common electrode surface electrode 38 is directly or indirectly connected to the control unit 88.
- 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) each time there is a discharge request, and then a predetermined potential is set. At this timing, the potential is set again. Thereby, the piezoelectric ceramic layers 21a and 21b return to the original (flat) shape at the timing when the individual electrode 25 becomes low potential (beginning), and the volume of the pressurizing chamber 10 is in an 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 7 to discharge 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 pulse width is actually set to a value of about 0.5 AL to 1.5 AL because there are other factors to consider, such as combining the ejected droplets into one. Further, since the discharge amount can be reduced by setting the pulse width to a value outside of AL, the pulse width is set to a value outside of AL in order to reduce the discharge amount.
- the descender 7 is a flow path connecting the pressurizing chamber 10 and the discharge hole 8 and is a partial flow path that constitutes a part of the flow path through which the liquid flows.
- the descender 7 is disposed on the plates 4b to 4k.
- the liquid flows in the stacking direction.
- the liquid mainly flows from the pressurization chamber surface 4-2 toward the discharge hole surface 4-1, but the end of the pressurization chamber 10 to which the descender 7 is connected and the discharge hole 8 are different in the plane direction. Therefore, the liquid flows while gradually shifting in the plane direction. In other words, the descender 7 is inclined with respect to the stacking direction.
- the descender holes 7b to 7k constituting the descender 7 are displaced to some extent due to manufacturing variations.
- the flow path characteristics change greatly depending on the relationship between the tilt direction of the descender 7 and the direction of displacement.
- the two overlap each other, and a portion with a narrower cross-sectional area is formed in the middle of the descender 7. It is considered that the way of change becomes larger and the influence on the ejection characteristics becomes larger.
- the position shift may be caused when the position of the individual descender hole is shifted in each plate, or when the stack of the plates is shifted and the descender hole arranged on the plate is shifted as a whole.
- the head main body 2a of the present embodiment there is a descender 7 inclined in various directions.
- the descender 7 tilted in a certain direction may increase the droplet amount
- the descender 7 tilted in another direction may decrease the droplet amount, resulting in variations in the entire head body 2a. May increase and printing accuracy may be reduced.
- FIG. 5B is an embodiment of the configuration, and is an enlarged longitudinal sectional view of a part of the descender 7 of FIG.
- FIG. 5A the shape of the detail of the descender 7 formed by etching is omitted.
- FIG. 5C is a plan view showing the arrangement of the openings of the holes constituting the descender 7.
- the inner side of the opening 7cb on the lower side (second plate 4d side) of the first hole 7c is hatched with a diagonal line from the upper right to the lower left of the figure, and the upper side (the second The inside of the opening 7ea on the second plate 4d side is hatched with a diagonal line from the upper left to the lower right in the figure.
- the three plates stacked in succession are referred to as a first plate 4c, a second plate 4d, and a third plate 4e in order from the top.
- Each of the first plate 4c, the second plate 4d, and the third plate 4e may be a complex formed by joining a plurality of components.
- the first plate 4c is the above-described aperture plate 4c
- the second plate 4d is the above-described supply plate 4d
- the third plate 4e is the above-described manifold plate 4e.
- the first hole 7c that is a part of the descender 7 is disposed in the first plate 4c
- the second hole 7d that is a part of the descender 7 is disposed in the second plate 4d
- the descender 7 is disposed in the third plate 4e.
- a part of the third hole 7e is arranged.
- each of the opening 7cb on the second plate 4d side of the first hole 7c and the opening 7ea on the second plate 4d side of the third hole 7e has a region overlapping each other and a region not overlapping each other.
- the opening 7cb on the second plate 4d side of the first hole 7c and the opening 7ea on the second plate 4d side of the third hole 7e are housed inside the second hole 7d.
- the state in which the lower opening 7cb of the first hole 7c and the upper opening 7ea of the third hole 7e are accommodated inside the second hole 7d is a plan view as shown in FIG. 5C.
- the lower opening 7cb of the first hole 7c is accommodated inside the opening 7da above the second hole 7d (on the first plate 4c side), and the upper opening 7ea of the third hole 7e is the second opening 7ea.
- it when it is simply described as a plan view, it means that the plate 4a to 4m is viewed in plan view.
- the presence of the region included in the lower opening 7cb of the first hole 7c and the upper opening 7ea of the third hole 7e allows the liquid from the first hole 7c to the third hole 7e to flow smoothly.
- the presence of a region not included in the opening 7cb on the lower side of 7c means that the first hole 7c and the third hole 7e are displaced from each other.
- the discharge hole surface 4-1 it moves in the plane direction.
- the lower opening 7cb of the first hole 7c and the upper opening 7ea of the third hole 7e are accommodated inside the second hole 7d, thereby causing a positional shift between the holes. The influence at the time can be reduced.
- Such an arrangement is also effective in a flow path other than the descender 7 where the liquid flows in the stacking direction.
- the change of the pressure transmitted through the inside directly affects the discharge characteristics, it is particularly necessary to use such an arrangement.
- the strength of the pressure affects the discharge speed and the discharge amount, but also the direction of the liquid discharged from the discharge hole 8 slightly changes depending on how the pressure in the descender 7 is transmitted.
- the ejection there is a high need for such an arrangement.
- the upper opening 7da and the lower opening 7db of the second hole 7d may be shifted from each other.
- the lower opening 7cb of the first hole 7c and the upper opening 7ea of the third hole 7e are the second holes.
- the area of the opening 7da on the upper side of the second hole 7d and the area of the opening 7db on the lower side of the second hole 7d can be reduced while being accommodated inside the 7d. If there is a part where the cross-sectional area changes in the middle of the descender 7, the pressure wave may be difficult to be transmitted, for example, a part of the pressure wave is reflected at the boundary.
- the area of the upper opening 7da of the second hole 7d with respect to the area of the lower opening 7cb of the first hole 7c is shifted by disposing the upper opening 7da and the lower opening 7db of the second hole 7d. Can be reduced, and the reduction ratio of the area of the upper opening 7ea of the third hole 7e with respect to the area of the lower opening 7db of the second hole 7d can be reduced, and the pressure wave transmission efficiency can be increased.
- the direction of the area centroid of the lower opening 7db of the second hole 7d with respect to the area centroid of the upper opening 7da of the second hole 7d is defined as the third hole with respect to the area centroid of the lower opening 7cb of the first hole 7c.
- the same direction as the direction of the center of gravity of the area of the opening 7ea on the upper side of 7e is set, the pressure transmission efficiency can be enhanced as described above while the descender 7 moves the liquid in the plane direction.
- the same direction means that the angle formed by the above two directions is smaller than 90 degrees, and the angle formed by the two directions is further preferably 60 degrees or less, particularly preferably 30 degrees or less.
- the lower opening 7cb of the first hole 7c becomes the upper opening 7da above the second hole 7d.
- the lower opening 7cb of the first hole 7c may have a region not included in the lower opening 7db of the second hole 7d.
- the upper opening 7ea of the third hole 7e is accommodated inside the lower opening 7db of the second hole 7d, and the upper opening 7ea of the third hole 7e is It is also possible to have a region that is not included in the upper opening 7da. Thereby, the liquid can be smoothly moved in the plane direction while preventing a decrease in pressure transmission efficiency.
- the lower opening 7cb of the first hole 7c is accommodated inside the upper opening 7da of the second hole 7d. It is confirmed that a region not included in the opening 7db below the second hole 7d exists in the opening 7cb below the first hole 7c, or the opening 7ea above the third hole 7e is the second hole It is difficult to confirm that the region not included in the upper opening 7da of the second hole 7d is present in the upper opening 7ea of the third hole 7e while being within the opening 7db of the lower side of 7d. is there.
- the opening 7cb below the first hole 7c is located above the second hole 7d. It is confirmed that an area that is contained inside the opening 7da and that is not included in the opening 7db below the second hole 7d exists in the opening 7cb below the first hole 7c, and is located above the third hole 7e.
- the opening 7ea is accommodated inside the opening 7db below the second hole 7d, and a region not included in the opening 7da above the second hole 7d exists in the opening 7ea above the third hole 7e. You should confirm.
- the second plate 4d is preferably the thickest.
- the second hole 7d of the second plate 4d is larger than the opening 7cb below the first hole 7c and the opening 7ea above the third hole 7e. Therefore, a region where the liquid does not flow easily exists in the peripheral portion of the second hole 7d.
- the second plate 4d is thin, the second plate 4d expands in the outer peripheral region where the liquid is difficult to flow in the second plate 4d with respect to the length in the direction in which the liquid flows.
- the second plate 4d is preferably thicker. In other words, in a thick plate, it is preferable to widen the cross-sectional area of the hole and make the hole a second hole 7d.
- the second plate 4d is preferably the thickest plate among the plates 4b to 4k in which the descender holes 4b to 4k are arranged.
- the descender 7 is inclined with respect to the stacking direction.
- the decenter 7 itself is composed of the decenter holes 7b to 7k connected in a substantially straight line. It is considered that the stacking deviation of the plates 4b to 4k is not so much related to the thickness of the plates 4b to 4k, but the influence of the stacking deviation varies depending on the thickness of the plates 4b to 4k.
- the cross-sectional area of the second hole 7d is increased.
- the second hole has the same cross-sectional area as the first hole and the third hole.
- the misalignment creates a plate in which the flow of liquid in the plate becomes more slanted
- the length of the flow of liquid corresponding to that (hereinafter sometimes referred to as the flow path length) Becomes longer.
- a case is considered in which a laminating shift occurs in a thin plate or plates stacked above and below it, and the flow of liquid flowing through the thin plate becomes more oblique.
- the flow of liquid flowing through the holes arranged in that plate becomes more oblique and the flow path length is longer.
- the effect of misalignment increases. In order to reduce the influence, it is preferable to enlarge the hole of the plate adjacent to the thin plate to form the second hole.
- the hole disposed in the second plate 4d laminated immediately below the thin first plate 4c is the second hole 7d having a large cross-sectional area.
- the cross-sectional area of the first hole 7c in the first plate 4c having a small thickness it is preferable to increase the cross-sectional area of the first hole 7c in the first plate 4c having a small thickness.
- the liquid stays as described above. Since the influence is increased, it is preferable to increase the cross-sectional area of the second hole 7d disposed in the second plate 4d below the first plate 4c having a small thickness.
- the first plate 4c is made thin in order to create a flow path having a high flow resistance and a small variation.
- the liquid discharge head 2 according to the present embodiment discharges liquid by pulling driving. For this reason, in order to reflect a part of pressure wave which goes to the manifold 5 from the pressurization chamber 10, it is necessary to make the flow path resistance in the aperture 6 high. In addition, since the way of reflection varies depending on the value of the channel resistance, it is preferable that the variation in channel resistance is small.
- the portion with high flow path resistance of the squeeze 6 is constituted by a flow path that flows in the horizontal direction in one plate, and the plate is thinned. Therefore, in the flow path member 4 of the present embodiment, the thickness of the first plate 4c is made as thin as 25 ⁇ m, and the second hole 7d of the second plate 4d is enlarged and the second plate 4d so that the influence is difficult to occur.
- the thickness of 4d is as thick as 150 ⁇ m.
- the other plates 4b, 4e to 4k have a thickness of 100 ⁇ m.
- the second hole 7d having a large cross-sectional area in the second plate 4d stacked between the first plate 4c and the third plate 4e having different thicknesses it is preferable to arrange the second hole 7d having a large cross-sectional area in the second plate 4d stacked between the first plate 4c and the third plate 4e having different thicknesses. Thereby, the influence of the position shift resulting from the thinner plate among the first plate 4c and the third plate 4e can be reduced.
- the cross-sectional shape perpendicular to the stacking direction of the second holes 7d is circular, but may be oval.
- the oval shape means not only a mathematical elliptical shape but also a shape including a shape obtained by extending a circle in one direction.
- the cross-sectional shape perpendicular to the stacking direction of the second hole 7d is By making the oval shape long in the direction connecting the area centroid of the opening 7cb below the first hole 7c and the area centroid of the opening 7ea above the third hole 7e, the width in the direction orthogonal to that direction is made very large Instead, the opening 7cb below the first hole 7c and the opening 7ea above the third hole 7e can be connected by the second hole 7d.
- the second hole 7d has an oval cross-sectional shape perpendicular to the stacking direction, and the area center of gravity of the opening 7cb on the second plate 4d side of the first hole 7c when the flow path member 4 is viewed in plan view. It is preferable to lengthen the third hole 7e in the direction connecting the center of gravity of the area of the opening 7ea on the second plate 4d side.
- FIG. 6 is a schematic plan view showing the arrangement relationship between the pressurizing chamber 10 and the discharge holes 8.
- FIG. 6 shows two pressurization chambers 10 connected to different submanifolds 5b and arranged adjacent to each other, and discharge holes 8 connected to the respective pressurization chambers 10. .
- the two pressurizing chambers 10 belong to the same pressurizing chamber row, and are arranged along an imaginary straight line L extending in the short direction of the head main body 2a.
- the discharge holes 8 connected to the pressurizing chambers 10 belonging to the pressurizing chamber row arranged along the virtual straight line L are in the range indicated by R in FIG.
- the positions of the 32 discharge holes 8 connected to the 32 pressurizing chambers 10 belonging to the pressurizing chamber array arranged along the imaginary straight line L in the length direction of the flow path member 4 are indicated by broken lines. Shown in a circle.
- the interval between the ejection holes 8 is constant (indicated by d [ ⁇ m] in the figure).
- the descender holes 7b to 7k constituting the descender 7 are arranged along a straight line connecting the opening above the descender hole 7b and the discharge hole 8.
- the descender holes 7c to 7k are not shown in FIG. 6, and the upper opening of the descender hole 7b, the discharge hole 8, and the straight line connecting the upper opening of the descender hole 7b and the discharge hole 8. , Is shown.
- the center of area of the upper opening of the descender hole 7b of the descender 7 connected to the pressurizing chamber 10 drawn in the upper part of the figure is C1, and the position of the discharge hole 8 connected from there is C2. is there.
- the direction from C1 to C2 coincides with the direction from the center of area of the opening 7cb below the first hole 7c of the descender 7 to the area of center of gravity of the opening 7ea above the third hole 7e.
- the area center of gravity of the upper opening of the descender hole 7b of the descender 7 connected to the pressurizing chamber 10 depicted in the lower part of FIG. 6 is C3, and the position of the discharge hole 8 connected from there is C4.
- the direction from C3 to C4 coincides with the direction from the center of area of the opening 7cb below the first hole 7c of the descender 7 to the area of center of gravity of the opening 7ea above the third hole 7e.
- the angle formed by the first direction D1 from C1 to C2 and the second direction D2 from C3 to C4 is determined by the angle ⁇ 1 formed by the virtual line L and the first direction D1, and the virtual line L and the second direction D2. This is the sum of the angle ⁇ 2 formed, and is an angle slightly less than 180 degrees. This indicates that the inclinations of these two descenders 7 are substantially in opposite directions. That is, the position of the upper opening 7ea of the third hole 7e with respect to the lower opening 7cb of the first hole 7c is substantially opposite in the two descenders 7.
- the two descenders 7 The tendency of the discharge amount and discharge speed is different. For example, the discharge amount from one descender 7 may increase while the discharge amount from the other descender 7 may decrease.
- the maximum angle formed by the first direction D1 and the second direction D2 in the head body 2a is larger than 90 degrees, the difference in ejection characteristics between the descenders 7 in such a state becomes large. Therefore, in such a head main body 2a, it is useful to use the configuration of the first hole 7c, the second hole 7d, and the first hole 7e as described above. This is particularly useful in the head main body 2a in which the maximum angle formed by the first direction D1 and the second direction D2 is 135 degrees or more.
- Common electrode 25 ... Individual electrode 25a ... Individual electrode body 25b ... Extraction electrode 26 ... Connection electrode 28 ... Surface electrode for common electrode 30 ... -Displacement element 60 ... Signal transmission unit 70 ... Head mounting frame 72 ... Head group 80a ... Paper feed roller 80b ... Collection roller 82A ... Guide roller 82B ... Conveyance roller 88- ..Control unit P: Printing paper
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- 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~4m・・・(流路部材の)プレート
4c・・・第1プレート
4d・・・第2プレート
4e・・・第3プレート
4-1・・・吐出孔面
4-2・・・加圧室面
5・・・マニホールド
5a・・・(マニホールドの)開口
5b・・・副マニホールド
6・・・しぼり
7・・・ディセンダ
7c・・・第1孔(ディセンダ孔)
7cb・・・第1孔の下側(第2プレート側)の開口
7d・・・第2孔(ディセンダ孔)
7da・・・第2孔の上側(第1プレート側)の開口
7db・・・第2孔の下側(第3プレート側)の開口
7e・・・第3孔(ディセンダ孔)
7ea・・・第3孔の上側(第2プレート側)の開口
7b、7g・・・ディセンダ孔
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
15・・・隔壁
16・・・ダミー加圧室
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
28・・・共通電極用表面電極
30・・・変位素子
60・・・信号伝達部
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
P・・・印刷用紙
Claims (11)
- 部分流路を含む流路を有する液体吐出ヘッド用の流路部材であって、
該流路部材は、積層された複数のプレートを含み、該複数のプレートは、連続して積層されている第1プレート、第2プレートおよび第3プレートを含み、
前記第1プレートは、該第1プレートを貫通しており、前記部分流路の一部を構成している、第1孔を有しており、
前記第2プレートは、該第2プレートを貫通しており、前記部分流路の一部を構成している、第2孔を有しており、
前記第3プレートは、該第3プレートを貫通しており、前記部分流路の一部を構成している、第3孔を有しており、
前記流路部材を平面視したとき、
前記第1孔の前記第2プレート側の開口および前記第3孔の前記第2プレート側の開口は、互いに重なる領域と、互いに重ならない領域とが存在し、
前記第1孔の前記第2プレート側の開口および前記第3孔の前記第2プレート側の開口は、前記第2孔の内側に納まっていることを特徴とする液体吐出ヘッド用の流路部材。 - 前記流路部材には、吐出孔および加圧室が配置されており、前記部分流路は、前記加圧室および前記吐出孔と繋がっていることを特徴とする請求項1に記載の液体吐出ヘッド用の流路部材。
- 前記流路部材を平面視したとき、
前記第2孔の前記第1プレート側の開口の面積重心に対する当該第2孔の前記第3プレート側の開口の面積重心の方向は、
前記第1孔の前記第2プレート側の開口の面積重心に対する前記第3孔の前記第2プレート側の開口の面積重心の方向と同じ方向であることを特徴とする請求項1または2に記載の液体吐出ヘッド用の流路部材。 - 前記流路部材を平面視したとき、
前記第1孔の前記第2プレート側の開口は、前記第2孔の前記第1プレート側の開口の内側に納まっているとともに、前記第2孔の前記第3プレート側の開口に含まれない領域を有することを特徴とする請求項1~3のいずれかに記載の液体吐出ヘッド用の流路部材。 - 前記流路部材を平面視したとき、
前記第3孔の前記第2プレート側の開口は、前記第2孔の前記第3プレート側の開口の内側に納まっているとともに、前記第2孔の前記第1プレート側の開口に含まれない領域を有することを特徴とする請求項1~4のいずれかに記載の液体吐出ヘッド用の流路部材。 - 前記第1プレート、前記第2プレートおよび前記第3プレートの中で、前記第2プレートがもっとも厚いことを特徴とする請求項1~5のいずれかに記載の液体吐出ヘッド用の流路部材。
- 前記第1プレートの厚みと前記第3プレートの厚みとが異なることを特徴とする請求項1~6のいずれかに記載の液体吐出ヘッド用の流路部材。
- 前記第2孔は、積層方向に直交する断面が長円形状であり、かつ前記流路部材を平面視したとき、前記第1孔の前記第2プレート側の開口の面積重心と前記第3孔の前記第2プレート側の開口の面積重心とを結ぶ方向に長いことを特徴とする請求項1~7に記載の液体吐出ヘッド用の流路部材。
- 前記部分流路と同じ構成を有する複数の部分流路と、複数の吐出孔と、複数の加圧室と、を有しており、
前記複数の部分流路は、前記複数の吐出孔と前記複数の加圧室とをそれぞれ繋いでおり、
前記流路部材を平面視したとき、
1つの前記部分流路における、前記第1孔の前記第2プレート側の開口の面積重心から前記第3孔の前記第2プレート側の開口の面積重心に向かう第1方向と、
他の前記部分流路における、前記第1孔の前記第2プレート側の開口の面積重心から前記第3孔の前記第2プレート側の開口の面積重心に向かう第2方向との成す角度が90度より大きいことを特徴とする請求項1~8のいずれかに記載の液体吐出ヘッド用の流路部材 - 請求項1~9のいずれかに記載の液体吐出ヘッド用の流路部材と、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を備えていることを特徴とする記録装置。
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JP2016504234A JP5933145B1 (ja) | 2015-02-24 | 2015-08-29 | 液体吐出ヘッド用の流路部材、およびそれを用いた、液体吐出ヘッドならびに記録装置 |
US15/114,707 US9688070B2 (en) | 2015-02-24 | 2015-08-29 | Channel member for liquid ejecting head, liquid ejecting head including the same, and recording device including the same |
EP15883295.6A EP3141387B1 (en) | 2015-02-24 | 2015-08-29 | Flow path member for liquid ejection head, and liquid ejection head and recording apparatus using same |
US15/630,120 US10081183B2 (en) | 2015-02-24 | 2017-06-22 | Channel member for liquid ejecting head, liquid ejecting head including the same, and recording device including the same |
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US15/630,120 Continuation US10081183B2 (en) | 2015-02-24 | 2017-06-22 | Channel member for liquid ejecting head, liquid ejecting head including the same, and recording device including the same |
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US9688070B2 (en) | 2017-06-27 |
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JP5988414B2 (ja) | 2016-09-07 |
US20170008282A1 (en) | 2017-01-12 |
EP3141387A1 (en) | 2017-03-15 |
EP3141387B1 (en) | 2019-07-10 |
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