JP5822624B2 - Liquid discharge head and recording apparatus using the same - Google Patents

Liquid discharge head and recording apparatus using the same Download PDF

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JP5822624B2
JP5822624B2 JP2011217405A JP2011217405A JP5822624B2 JP 5822624 B2 JP5822624 B2 JP 5822624B2 JP 2011217405 A JP2011217405 A JP 2011217405A JP 2011217405 A JP2011217405 A JP 2011217405A JP 5822624 B2 JP5822624 B2 JP 5822624B2
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liquid
liquid discharge
cover
discharge head
connection
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JP2012091510A (en
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松尾 茂樹
茂樹 松尾
慎 石倉
慎 石倉
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京セラ株式会社
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Description

  The present invention relates to a liquid discharge head that discharges droplets and a recording apparatus using the same.

  In recent years, printing apparatuses using inkjet recording methods such as inkjet printers and inkjet plotters are not only printers for general consumers, but also, for example, formation of electronic circuits, manufacture of color filters for liquid crystal displays, manufacture of organic EL displays It is also widely used for industrial applications.

  In such an ink jet printing apparatus, a liquid discharge head for discharging liquid is mounted as a print head. This type of print head includes a heater as a pressurizing unit in an ink flow path filled with ink, heats and boiles the ink with the heater, pressurizes the ink with bubbles generated in the ink flow path, A thermal head system that ejects ink as droplets from the ink ejection holes, and a part of the wall of the ink channel filled with ink is bent and displaced by a displacement element, and the ink in the ink channel is mechanically pressurized, and the ink A piezoelectric method for discharging liquid droplets from discharge holes is generally known.

  In addition, in such a liquid discharge head, a serial type that performs recording while moving the liquid discharge head in a direction (main scanning direction) orthogonal to the conveyance direction (sub-scanning direction) of the recording medium, and main scanning from the recording medium There is a line type in which recording is performed on a recording medium conveyed in the sub-scanning direction with a liquid discharge head that is long in the direction fixed. The line type has the advantage that high-speed recording is possible because there is no need to move the liquid discharge head as in the serial type.

  In order to print droplets at a high density in any of the serial type and line type liquid discharge heads, the density of the liquid discharge holes for discharging the droplets formed in the liquid discharge head must be increased. There is a need to.

  Therefore, the liquid discharge head main body is provided so as to cover the manifold (common flow path) and the flow path member having the liquid discharge holes connecting the manifold through the plurality of liquid pressurization chambers, respectively, and the liquid pressurization chamber. It is known that the actuator unit having a plurality of displacement elements is laminated (see, for example, Patent Document 1). In this liquid discharge head main body, the liquid pressurizing chambers respectively connected to the plurality of liquid discharge holes are arranged in a matrix shape, and the displacement elements of the actuator unit provided so as to cover the liquid pressurization chambers are displaced, so that each liquid discharge hole Ink is ejected from the ink and printing is possible at a resolution of 600 dpi in the main scanning direction. In addition, the liquid discharge head body is configured by attaching a casing to the liquid discharge head, and a signal for driving the liquid discharge head body is transmitted by a signal cable through a hole opened in the casing. Is covered with a resin lid.

JP 2010-052256 A

However, in the liquid discharge head described in Patent Document 1, liquid mist generated during printing enters the inside of the housing from between the signal cable and the lid or between the lid and the housing, and the liquid causes a gap between the signal wiring and the like. There is a problem that the liquid discharge head may not operate due to a short circuit.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a liquid discharge head in which liquid mist does not easily enter and a recording apparatus using the liquid discharge head.

  The liquid discharge head of the present invention is provided with a liquid discharge head main body having a pressurizing unit for discharging liquid, and a cover member provided so as to cover a part of the liquid discharge head main body and having an opening in part. And a connection portion that is joined to the cover member so as to close the opening, and that is connected to an external wiring outside the cover member and is electrically connected to the pressure unit. And a substrate.

  The recording apparatus of the present invention is connected to the liquid discharge head described above, a transport unit that transports a recording medium to the liquid discharge head, and the connection portion of the liquid discharge head, and is connected via the connection substrate. And a controller for controlling the liquid discharge head body, which is electrically connected to the liquid discharge head body.

  According to the liquid ejection head of the present invention, the electrical signal between the outside and the liquid ejection head is performed via the connection substrate, and the opening of the cover member is blocked by joining the connection substrate to the cover member. Therefore, since the intrusion of the liquid droplets from the opening of the cover member can be suppressed, the reliability is improved.

  According to the recording apparatus of the present invention, since the intrusion of liquid droplets into the liquid discharge head can be suppressed, the reliability is improved.

1 is a schematic configuration diagram of a printer that is a recording apparatus according to an embodiment of the present invention. FIG. 2 is a plan view of a flow path member and a piezoelectric actuator constituting 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. 2. FIG. 3 is an enlarged view of a region surrounded by an alternate long and short dash line in FIG. It is a longitudinal cross-sectional view along the VV line of FIG. FIG. 2 is a perspective view of the liquid ejection head in FIG. 1. FIG. 7 is a longitudinal sectional view of the liquid discharge head of FIG. 6 taken along line XX. It is a longitudinal cross-sectional view of the liquid discharge head of other embodiment of this invention.

  FIG. 1 is a schematic configuration diagram of a color ink jet printer which is a recording apparatus including a liquid discharge head according to an embodiment of the present invention. This color inkjet printer 1 (hereinafter referred to as printer 1) has four liquid ejection heads 2. These liquid discharge heads 2 are arranged along the conveyance direction of the printing paper P and are fixed to the printer 1. The liquid discharge head 2 has an elongated shape in a direction from the front to the back in FIG. This long direction is sometimes called the longitudinal direction.

  In the printer 1, a paper feed unit 114, a transport unit 120, and a paper receiver 116 are sequentially provided along the transport path of the printing paper P. In addition, the printer 1 is provided with a control unit 100 for controlling the operation of each unit of the printer 1 such as the liquid discharge head 2 and the paper feeding unit 114.

  The paper supply unit 114 includes a paper storage case 115 that can store a plurality of printing papers P, and a paper supply roller 145. The paper feed roller 145 can send out the uppermost print paper P among the print papers P stacked and stored in the paper storage case 115 one by one.

  Between the paper feed unit 114 and the transport unit 120, two pairs of feed rollers 118a and 118b and 119a and 119b are arranged along the transport path of the printing paper P. The printing paper P sent out from the paper supply unit 114 is guided by these feed rollers and further sent out to the transport unit 120.

  The transport unit 120 includes an endless transport belt 111 and two belt rollers 106 and 107. The conveyor belt 111 is wound around belt rollers 106 and 107. The conveyor belt 111 is adjusted to such a length that it is stretched with a predetermined tension when it is wound around two belt rollers. Thus, the conveyor belt 111 is stretched without slack along two parallel planes each including a common tangent line of the two belt rollers. Of these two planes, the plane closer to the liquid ejection head 2 is a transport surface 127 that transports the printing paper P.

  As shown in FIG. 1, a conveyance motor 174 is connected to the belt roller 106. The transport motor 174 can rotate the belt roller 106 in the direction of arrow A. The belt roller 107 can rotate in conjunction with the transport belt 111. Therefore, the conveyance belt 111 moves along the direction of arrow A by driving the conveyance motor 174 and rotating the belt roller 106.

  In the vicinity of the belt roller 107, a nip roller 138 and a nip receiving roller 139 are arranged so as to sandwich the conveyance belt 111. The nip roller 138 is urged downward by a spring (not shown). A nip receiving roller 139 below the nip roller 138 receives the nip roller 138 biased downward via the conveying belt 111. The two nip rollers are rotatably installed and rotate in conjunction with the conveyance belt 111.

  The printing paper P sent out from the paper supply unit 114 to the transport unit 120 is sandwiched between the nip roller 138 and the transport belt 111. As a result, the printing paper P is pressed against the transport surface 127 of the transport belt 111 and is fixed on the transport surface 127. The printing paper P is transported in the direction in which the liquid ejection head 2 is installed according to the rotation of the transport belt 111. The outer peripheral surface 113 of the conveyor belt 111 may be treated with adhesive silicon rubber. Thereby, the printing paper P can be securely fixed to the transport surface 127.

  The four liquid discharge heads 2 are arranged close to each other along the conveyance direction by the conveyance belt 111. Each liquid discharge head 2 has a liquid discharge head main body 13 at the lower end and a cover member 90 attached to the liquid discharge head main body 13. The lower surface of the liquid discharge head main body 13 is a liquid discharge hole surface 4a provided with a number of liquid discharge holes 8 for discharging liquid (see FIG. 5).

Liquid droplets (ink) of the same color are ejected from the liquid ejection holes 8 provided in one liquid ejection head 2. Since the liquid ejection holes 8 of each liquid ejection head 2 are arranged at equal intervals in one direction (a direction parallel to the printing paper P and perpendicular to the conveyance direction of the printing paper P and the longitudinal direction of the liquid ejection head 2), Printing can be performed without gaps in one direction. The colors of the liquid ejected from each liquid ejection head 2 are magenta (M), yellow (Y), cyan (C), and black (K), respectively. Each liquid ejection head 2 is arranged with a slight gap between the liquid ejection hole opening plane 4 a on the lower surface of the liquid ejection head main body 13 and the transport surface 127 of the transport belt 111.

  The printing paper P transported by the transport belt 111 passes through the gap between the liquid ejection head 2 and the transport belt 111. At that time, droplets are ejected from the liquid ejection head body 13 constituting the liquid ejection head 2 toward the upper surface of the printing paper P. As a result, a color image based on the image data stored by the control unit 100 is formed on the upper surface of the printing paper P.

  A separation plate 140 and two pairs of feed rollers 121a and 121b and 122a and 122b are arranged between the transport unit 120 and the paper receiver 116. The printing paper P on which the color image is printed is conveyed to the peeling plate 140 by the conveying belt 111. At this time, the printing paper P is peeled from the transport surface 127 by the right end of the peeling plate 140. Then, the printing paper P is sent out to the paper receiving unit 116 by the feed rollers 121a to 122b. In this way, the printed printing paper P is sequentially sent to the paper receiving unit 116 and stacked on the paper receiving unit 116.

  Note that a paper surface sensor 133 is installed between the liquid ejection head 2 and the nip roller 138 that are the most upstream in the transport direction of the printing paper P. The paper surface sensor 133 includes a light emitting element and a light receiving element, and can detect the leading end position of the printing paper P on the transport path. The detection result by the paper surface sensor 133 is sent to the control unit 100. The control unit 100 can control the liquid ejection head 2, the conveyance motor 174, and the like so that the conveyance of the printing paper P and the printing of the image are synchronized based on the detection result sent from the paper surface sensor 133.

  FIG. 6 is a perspective view of the liquid discharge head 2, and FIG. 7 is a cross-sectional view of the liquid discharge head 2 shown in FIG. The liquid discharge head body 13 includes a flow path member 4, a branch flow path member 60, a reservoir flow path member 40, a piezoelectric actuator unit 21 that is a pressure unit, and a heater 65. In FIG. 7, the internal structure of the flow path such as the flow path member 4 is omitted.

  The liquid discharge head 2 includes a liquid discharge head main body 13 and a cover member 90. The cover member 90 is made of metal and has a rectangular parallelepiped shape. The cover member 90 includes a cylindrical cover member main body 90a and a lid 90b that can be attached to and detached from the cover member main body 90a. Since the lid 90b is disposed at a position where the surface facing the liquid ejection hole surface 4a is removed, the lid 90b can be removed and replaced even when the plurality of liquid ejection heads 2 are disposed adjacent to each other. By providing a resin that is elastically deformed between the cover member main body 90a and the lid 90b, intrusion of liquid droplets can be further suppressed. A hole 90ba is opened in the lid 90b, and the connection substrate 80 is joined to the lid 90b so as to close the hole 90ba. By performing bonding with a resin or a waterproof double-sided tape, it is possible to further suppress the intrusion of liquid droplets.

An external connector 82, which is a connection portion, is connected to an external surface of the cover member 90 of the connection substrate 80 (hereinafter sometimes simply referred to as an external surface) that is connected to external wiring. The presence of the external connector 82 facilitates connection to the control unit 100. The external connector 82 is mounted in a through hole on the outer surface of the cover member 90 of the connection board 80, that is, the terminal of the external connector 82 passes through the through hole provided in the connection board 80, and the cover member of the connection board 80 By joining the wiring 80a formed on the inner surface of 90 (hereinafter sometimes referred to simply as the inner surface) with a brazing material such as solder, the wiring can be reduced outside the connection substrate 80. It is possible to suppress disconnection of such wiring by a droplet. At that time, the penetration of mist through the through hole of the connection substrate 80 is suppressed by the brazing material in the through hole or the brazing material on the wiring 80a. A conductor is formed in the through hole and the brazing material is filled, so that the bonding is strengthened and the effect of suppressing the intrusion of mist is enhanced. However, the formation of the conductor in the through hole and the filling of the brazing material are not necessarily performed. Not necessary. Further, the bottom of the external connector 82 and the connection substrate 80 may be bonded with resin or the like. By inserting resin or the like between the external connector 82 and the connection board 80, it becomes difficult for liquid droplets to enter, and disconnection near the through hole near the lower part of the external connector 82 or the outer surface of the connection board 80. Generation can be suppressed.

  An internal connector 84 is mounted on the wiring 80 a on the inner surface of the connection substrate 80 with a brazing material such as solder. As described above, if the internal connector 84 is surface-mounted, wiring on the outer surface of the connection substrate 80 can be reduced, so that it is possible to suppress disconnection of such wiring by droplets. If the connection between the internal connector 84 and the external connector 82 is made as described above, wiring can be eliminated on the outer surface of the connection substrate 80, which is more preferable.

  Further, if the tip to which the internal connector 84 is connected is fixed to the cover member 90a or the liquid discharge head main body 13, the connection can be made simultaneously by the internal connector 84 when the lid 90b is attached / detached. . In order to obtain such a structure, it is preferable that the signal distribution board 86 is vertically set in the cover member 90.

  By setting the position where the internal connector 84 is mounted at the center of the liquid ejection head 2 in the short direction, the stress at the time of attaching and detaching the lid 90b is applied at an angle close to perpendicular to the connection substrate 80, and the stress applied obliquely is applied. Since there are few, mounting of the internal connector 84 is hard to be destroyed by stress. The central portion referred to here is a portion of the center 1/3 in the short direction. Since the lid 90b is detachable, even if the external connector 82 itself or the connection substrate 80 is disconnected due to liquid droplets, the liquid discharge head 2 can be easily repaired by replacing the lid 90b and the connection substrate 80. be able to. Moreover, the lid 90b and the connection substrate 80 can be manufactured without using a particularly expensive member, and the replacement cost can be reduced.

  The reservoir channel member 40 is provided with a reservoir channel, and one end thereof opens to the outside of the liquid ejection head 2 as a liquid introduction hole 41b. Further, a part of the inner wall of the reservoir channel is a damper made of an elastically deformable material. Since the damper can be deformed in the direction facing the surface opposite to the reservoir flow path, the volume of the reservoir flow path can be changed by elastically deforming the damper, and the liquid discharge amount increases rapidly. In this case, the liquid can be supplied stably. In addition, it is preferable to provide a filter in the reservoir flow path so that foreign matter contained in the liquid does not enter the branch flow path member 4, and non-ejection caused by clogging of foreign matter can be suppressed.

  The branch channel member 60 is provided with a branch channel and connects the reservoir channel and the manifold opening 5b. The liquid that has entered from the reservoir channel is divided into a plurality of channels on the way, and flows into the manifold 5 from the openings 5b of the plurality of manifolds.

The reservoir channel member 40 has an elastic plate 96 provided with a heat insulating member 97 and a signal distribution board that distributes drive signals for discharging liquid from the liquid discharge head body 13 to the four piezoelectric actuator units 21. A guide frame 88 for fixing 86 is fixed. The elastic plate 96 is not connected in the cross-sectional view of FIG. 7, but is fixed at a portion other than this cross-section. A drive signal sent from the control unit 100 via a signal cable (not shown) is mounted on the external connector 82, the connection board 80, the internal connector 84, the signal distribution board 86, the signal transmission unit 92, and the signal transmission unit 92. The liquid droplets are ejected by driving the liquid ejection element 50 of the piezoelectric actuator unit 21 described later through the driver IC 55 and pressurizing the liquid inside the flow path member 4. For example, the signal distribution board 86 may rectify the drive signal in addition to dividing the drive signal into the plurality of piezoelectric actuator units 21. The signal transmission unit 92 has a flexible belt-like shape, has a metal wiring inside, and a part of the wiring is exposed on the surface of the signal transmission unit 92, and the signal distribution board is formed by the exposed wiring. 86, the driver IC 55 and the piezoelectric actuator unit 21 are electrically connected. The signal transmission unit 92 is, for example, an FPC (Flexible Printed Circuit).

  The driver IC 55 generates heat when processing the drive signal. Since the driver IC 55 is pressed against the metal cover member 90 by deflecting the elastic plate 96, the generated heat is mainly transmitted to the cover member 90 and further spreads quickly over the entire cover member 90, and is radiated to the outside. It will be done. The heat insulating member 97 makes it difficult for heat to be transferred to the reservoir channel member. The heat insulating member 97 may also be made elastic to help press the driver IC 55 against the metal cover member 90.

  Next, the flow path member 4 constituting the liquid discharge head of the present invention will be described. FIG. 2 is a plan view showing the flow path member 4 and the piezoelectric actuator 21 in the liquid discharge head body 13. 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 liquid discharge head main body 13. FIG. 4 is an enlarged perspective view of the same position as in FIG. 3 and 4, in order to make the drawings easy to understand, the liquid pressurizing chamber 10 (liquid pressurizing chamber group 9), the squeezing 12, and the liquid discharge holes which are to be drawn by broken lines below the piezoelectric actuator unit 21. 8 is drawn with a solid line. FIG. 5 is a longitudinal sectional view taken along line VV in FIG.

  The liquid discharge head main body 13 includes a flat plate-like channel member 4, and a piezoelectric actuator unit 21 including a pressurizing unit, a branch channel member 60, and a reservoir channel member 40 on the channel member 4. The piezoelectric actuator unit 21 has a trapezoidal shape, and is disposed on the upper surface of the flow path member 4 so that a pair of parallel opposing sides of the trapezoid is parallel to the longitudinal direction of the flow path member 4. Further, two piezoelectric actuator units 21 are arranged on the flow path member 4 as a whole in a zigzag manner, two along each of two virtual straight lines parallel to the longitudinal direction of the flow path member 4. Yes. The oblique sides of the piezoelectric actuator units 21 adjacent to each other on the flow path member 4 partially overlap in the short direction of the flow path member 4. In the area printed by driving the overlapping piezoelectric actuator unit 21, the droplets ejected by the two piezoelectric actuator units 21 are mixed and landed.

  A manifold 5 is formed inside the flow path member 4. The manifold 5 has an elongated shape extending along the longitudinal direction of the flow path member 4, and an opening 5 b of the manifold 5 is formed on the upper surface of the flow path member 4. A total of ten openings 5 b are formed along each of two straight lines (imaginary lines) parallel to the longitudinal direction of the flow path member 4. The opening 5b is formed at a position that avoids a region where the four piezoelectric actuator units 21 are disposed. The manifold 5 is supplied with liquid from a liquid tank (not shown) through the opening 5b.

  The manifold 5 formed in the flow path member 4 is branched into a plurality of branches (the manifold 5 at the branched portion is sometimes referred to as a sub-manifold 5a, and the manifold 5 from the opening 5b to the sub-manifold 5a is referred to as a liquid supply path). 5c). The liquid supply path 5 c connected to the opening 5 b extends along the oblique side of the piezoelectric actuator unit 21 and is disposed so as to intersect with the longitudinal direction of the flow path member 4. In a region sandwiched between two piezoelectric actuator units 21, one manifold 5 is shared by adjacent piezoelectric actuator units 21, and the sub-manifold 5 a branches off from both sides of the manifold 5. These sub-manifolds 5 a extend in the longitudinal direction of the liquid discharge head main body 13 adjacent to each other in regions facing the piezoelectric actuator units 21 inside the flow path member 4. That is, both ends of the sub-manifold 5a are connected to the liquid supply path 5c.

  The flow path member 4 has four liquid pressurizing chamber groups 9 in which a plurality of liquid pressurizing chambers 10 are formed in a matrix (that is, two-dimensionally and regularly). The liquid pressurizing chamber 10 is a hollow region having a substantially rhombic planar shape with rounded corners. The liquid pressurizing chamber 10 is formed so as to open on the upper surface of the flow path member 4. These liquid pressurizing chambers 10 are arranged over almost the entire surface of the upper surface of the flow path member 4 facing the piezoelectric actuator unit 21. Accordingly, each liquid pressurizing chamber group 9 formed by these liquid pressurizing chambers 10 occupies a region having almost the same size and shape as the piezoelectric actuator unit 21. Further, the opening of each liquid pressurizing chamber 10 is closed by adhering the piezoelectric actuator unit 21 to the upper surface of the flow path member 4.

  In the present embodiment, as shown in FIG. 3, the manifold 5 branches into four rows of E1-E4 sub-manifolds 5a arranged in parallel with each other in the short direction of the flow path member 4, and each sub-manifold The liquid pressurizing chambers 10 connected to 5a constitute a row of liquid pressurizing chambers 10 arranged in the longitudinal direction of the flow path member 4 at equal intervals, and the four rows are arranged in parallel to each other in the short direction. Yes. Two rows of liquid pressurizing chambers 10 connected to the sub-manifold 5a are arranged on both sides of the sub-manifold 5a.

  As a whole, the liquid pressurizing chambers 10 connected from the manifold 5 constitute rows of the liquid pressurizing chambers 10 arranged in the longitudinal direction of the flow path member 4 at equal intervals, and the rows are 16 rows parallel to each other in the short direction. It is arranged. The number of the liquid pressurizing chambers 10 included in each liquid pressurizing chamber row gradually decreases from the long side toward the short side corresponding to the outer shape of the displacement element 50 as the pressurizing unit. Has been placed. The liquid discharge holes 8 are also arranged in the same manner. As a result, it is possible to form an image with a resolution of 600 dpi in the longitudinal direction as a whole.

  That is, when the liquid discharge hole 8 is projected so as to be orthogonal to a virtual straight line parallel to the longitudinal direction of the flow path member 4, it is connected to each sub-manifold 5a in the range of R of the virtual straight line shown in FIG. Four liquid discharge holes 8, that is, a total of 16 liquid discharge holes 8 are equally spaced at 600 dpi. Moreover, the individual flow paths 32 are connected to the sub manifolds 5a at intervals corresponding to 150 dpi on average. This is because the individual flow paths 32 connected to the sub-manifolds 5a are not necessarily connected at equal intervals when the liquid ejection holes 8 for 600 dpi are divided and connected to the four sub-manifolds 5a. The individual flow paths 32 are formed at intervals of an average of 170 μm (25.4 mm / 150 = 169 μm intervals if 150 dpi) in the extending direction of 5a, that is, the main scanning direction.

  Individual electrodes 35 to be described later are formed at positions facing the liquid pressurizing chambers 10 on the upper surface of the piezoelectric actuator unit 21. The individual electrode 35 is slightly smaller than the liquid pressurizing chamber 10, has a shape substantially similar to the liquid pressurizing chamber 10, and fits in a region facing the liquid pressurizing chamber 10 on the upper surface of the piezoelectric actuator unit 21. Is arranged.

  A large number of liquid discharge holes 8 are formed in the liquid discharge surface on the lower surface of the flow path member 4. These liquid discharge holes 8 are arranged at a position avoiding a region facing the sub-manifold 5 a arranged on the lower surface side of the flow path member 4.

  Further, these liquid discharge holes 8 are arranged in a region facing the piezoelectric actuator unit 21 on the lower surface side of the flow path member 4. These liquid discharge holes 8 occupy an area having almost the same size and shape as the piezoelectric actuator unit 21 as one group, and the liquid discharge holes 8 are displaced by displacing the displacement elements 50 of the corresponding piezoelectric actuator units 21. A droplet can be ejected from 8. The liquid discharge holes 8 are arranged at equal intervals along a plurality of straight lines parallel to the longitudinal direction of the flow path member 4.

  The flow path member 4 included in the liquid discharge head body 13 has a stacked structure in which a plurality of plates are stacked. These plates are a cavity plate 22, a base plate 23, an aperture (squeezing) plate 24, supply plates 25 and 26, manifold plates 27, 28 and 29, a cover plate 30 and a nozzle plate 31 in order from the upper surface of the flow path member 4. is there. A number of holes are formed in these plates. Each plate is aligned and laminated so that these holes communicate with each other to form the individual flow path 32 and the sub-manifold 5a. As shown in FIG. 5, the liquid discharge head main body 13 has a liquid pressurizing chamber 10 on the upper surface of the flow path member 4, the sub manifold 5 a on the inner lower surface side, and the liquid discharge holes 8 on the lower surface. Each part constituting the individual flow path 32 is disposed close to each other at different positions, and the sub-manifold 5 a and the liquid discharge hole 8 are connected via the liquid pressurizing chamber 10.

  The holes formed in each plate will be described. These holes include the following. First, the liquid pressurizing chamber 10 formed in the cavity plate 22. Second, there is a communication hole that forms a flow path that connects from one end of the liquid pressurizing chamber 10 to the sub-manifold 5a. This communication hole is formed in each plate from the base plate 23 (specifically, the inlet of the liquid pressurizing chamber 10) to the supply plate 25 (specifically, the outlet of the sub manifold 5a). The communication hole includes the aperture 12 formed in the aperture plate 24 and the individual supply flow path 6 formed in the supply plates 25 and 26.

  Third, there is a communication hole that constitutes a flow channel that communicates from the other end of the liquid pressurizing chamber 10 to the liquid discharge hole 8, and this communication hole is referred to as a descender (partial flow channel) in the following description. . The descender is formed on each plate from the base plate 23 (specifically, the outlet of the liquid pressurizing chamber 10) to the nozzle plate 31 (specifically, the liquid discharge hole 8).

  Fourthly, there is a communication hole constituting the sub-manifold 5a. The communication holes are formed in the manifold plates 27 to 29.

  Such communication holes are connected to each other to form an individual flow path 32 from the liquid inflow port (the outlet of the submanifold 5a) from the submanifold 5a to the liquid discharge hole 8. The liquid supplied to the sub manifold 5a is discharged from the liquid discharge hole 8 through the following path. First, from the sub-manifold 5a, it passes through the individual supply flow path 6 and reaches one end of the aperture 12. Next, it proceeds horizontally along the extending direction of the aperture 12 and reaches the other end of the aperture 12. From there, it reaches one end of the liquid pressurizing chamber 10 upward. Further, the liquid pressurizing chamber 10 proceeds horizontally along the extending direction of the liquid pressurizing chamber 10 and reaches the other end of the liquid pressurizing chamber 10. While moving little by little in the horizontal direction from there, it proceeds mainly downward and proceeds to the liquid discharge hole 8 opened on the lower surface.

  Similarly to the flow path member 4, the branch flow path member 60 is obtained by a rolling method or the like, and is processed into a predetermined shape by etching on the plates 60a to 60c. In addition, a recess 63 is provided in which the liquid channel 61 and the piezoelectric actuator are accommodated.

  As shown in FIG. 5, the piezoelectric actuator unit 21 has a laminated structure including two piezoelectric ceramic layers 21a and 21b. Each of these piezoelectric ceramic layers 21a and 21b has a thickness of about 20 μm. The total thickness of the piezoelectric actuator unit 21 is about 40 μm. Each of the piezoelectric ceramic layers 21a and 21b extends so as to straddle the plurality of liquid pressurizing chambers 10 (see FIG. 3). The piezoelectric ceramic layers 21a and 21b are made of a lead zirconate titanate (PZT) ceramic material having ferroelectricity.

  The piezoelectric actuator unit 21 includes a common electrode 34 made of a metal material such as Ag—Pd and an individual electrode 35 made of a metal material such as Au. As described above, the individual electrode 35 is disposed at a position facing the liquid pressurizing chamber 10 on the upper surface of the piezoelectric actuator unit 21. One end of the individual electrode 35 is drawn out of a region facing the liquid pressurizing chamber 10 to form a connection electrode 36. The connection electrode 36 is made of, for example, silver-palladium containing glass frit, and has a convex shape with a thickness of about 15 μm. Further, the connection electrode 36 is electrically joined to an electrode provided in the signal transmission unit 92. Although details will be described later, a drive signal is supplied from the control unit 100 to the individual electrode 35 through the signal transmission unit 92. The drive signal is supplied in a constant cycle in synchronization with the conveyance speed of the print medium P.

  The common electrode 34 is formed over almost the entire surface in the area between the piezoelectric ceramic layer 21a and the piezoelectric ceramic layer 21b. That is, the common electrode 34 extends so as to cover all the liquid pressurizing chambers 10 in the region facing the piezoelectric actuator unit 21. The thickness of the common electrode 34 is about 2 μm. The common electrode 34 is grounded in a region not shown, and is held at the ground potential. In the present embodiment, a surface electrode (not shown) different from the individual electrode 35 is formed on the piezoelectric ceramic layer 21b at a position avoiding the electrode group composed of the individual electrodes 35. The surface electrode is electrically connected to the common electrode 34 through a through-hole formed in the piezoelectric ceramic layer 21b, and, like the large number of individual electrodes 35, another electrode on the signal transmission unit 92. Connected with.

  As shown in FIG. 5, the common electrode 34 and the individual electrode 35 are disposed so as to sandwich only the uppermost piezoelectric ceramic layer 21b. A region sandwiched between the individual electrode 35 and the common electrode 34 in the piezoelectric ceramic layer 21b is referred to as an active portion, and the piezoelectric ceramic in that portion is polarized. In the piezoelectric actuator unit 21 of the present embodiment, only the uppermost piezoelectric ceramic layer 21b includes an active portion, and the piezoelectric ceramic 21a does not include an active portion and functions as a diaphragm. The piezoelectric actuator unit 21 has a so-called unimorph type configuration.

  As will be described later, when a predetermined drive signal is selectively supplied to the individual electrode 35, pressure is applied to the liquid in the liquid pressurizing chamber 10 corresponding to the individual electrode 35. As a result, droplets are discharged from the corresponding liquid discharge ports 8 through the individual flow paths 32. That is, the portion of the piezoelectric actuator unit 21 that faces each liquid pressurizing chamber 10 corresponds to an individual displacement element 50 (actuator) corresponding to each liquid pressurizing chamber 10 and the liquid discharge port 8. That is, in the laminated body composed of two piezoelectric ceramic layers, the displacement element 50 which is a piezoelectric actuator having a unit structure as shown in FIG. The diaphragm 21a, the common electrode 34, the piezoelectric ceramic layer 21b, and the individual electrodes 35 positioned immediately above the chamber 10 are formed. The piezoelectric actuator unit 21 includes a plurality of displacement elements 50 that are pressurizing portions. . In the present embodiment, the amount of liquid ejected from the liquid ejection port 8 by one ejection operation is about 5 to 7 pl (picoliter).

  The large number of individual electrodes 35 are individually electrically connected to the control unit 100 via the signal transmission unit 92 and wiring so that the potential can be individually controlled.

In the piezoelectric actuator unit 21 in the present embodiment, when an electric field is applied in the polarization direction to the piezoelectric ceramic layer 21b by setting the individual electrode 35 to a potential different from that of the common electrode 34, the portion to which this electric field is applied is piezoelectric. It works as an active part that is distorted by the effect. At this time, the piezoelectric ceramic layer 21b expands or contracts in the thickness direction, that is, the stacking direction, and tends to contract or extend in the direction perpendicular to the stacking direction, that is, the surface direction, due to the piezoelectric lateral effect. On the other hand, since the remaining piezoelectric ceramic layer 21a is an inactive layer that does not have a region sandwiched between the individual electrode 35 and the common electrode 34, it does not spontaneously deform. In other words, the piezoelectric actuator unit 21 uses the upper piezoelectric ceramic layer 21b (that is, the side away from the liquid pressurizing chamber 10) as a layer including the active portion and the lower side (that is, close to the liquid pressurizing chamber 10). This is a so-called unimorph type configuration in which the piezoelectric ceramic layer 21a on the side) is an inactive layer.

  In this configuration, when the control unit 100 sets the individual electrode 35 to a predetermined positive or negative potential with respect to the common electrode 34 so that the electric field and the polarization are in the same direction, a portion sandwiched between the electrodes of the piezoelectric ceramic layer 21b. (Active part) contracts in the surface direction. On the other hand, 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. As a result, there is a difference in strain in the polarization direction between the piezoelectric ceramic layer 21b and the piezoelectric ceramic layer 21a, and the piezoelectric ceramic layer 21b is deformed so as to protrude toward the liquid pressurizing chamber 10 (unimorph deformation). .

The actual driving procedure in the present embodiment is to first set the individual electrode 35 to a first voltage V1V (volt, which may be omitted hereinafter) that is higher than the common electrode 34, and every time there is a discharge request. The individual electrode 35 and the common electrode 34 are once set to a low potential, for example, the same potential by applying a second voltage lower than the first voltage V1, and then set to a high potential again at a predetermined timing. As a result, the piezoelectric ceramic layers 21a and 21b return to the original shape at the timing when the individual electrode 35 becomes low potential, and the volume of the liquid pressurizing chamber 10 is compared with the initial state (the state where the potentials of both electrodes are different). To increase. At this time, a negative pressure is applied to the liquid pressurizing chamber 10 and the liquid is sucked into the liquid pressurizing chamber 10 from the manifold 5 side. Thereafter, at the timing when the individual electrode 35 is set to a high potential again, the piezoelectric ceramic layers 21a and 21b are deformed so as to protrude toward the liquid pressurizing chamber 10, and the volume of the liquid pressurizing chamber 10 is reduced so that the inside of the liquid pressurizing chamber 10 Becomes a positive pressure, the pressure on the liquid rises, and droplets are ejected. That is, a drive signal including a pulse based on a high potential is supplied to the individual electrode 35 in order to eject a droplet. The ideal pulse width is AL (Acoustic Length), which is the length of time during which the pressure wave propagates from the manifold 5 to the liquid discharge hole 8 in the liquid pressurizing chamber 10. According to this, when the inside of the liquid pressurizing chamber 10 is reversed from the negative pressure state to the positive pressure state, both pressures are combined, and the liquid droplet can be ejected with a stronger pressure.

  In gradation printing, gradation expression is performed by the number of droplets ejected continuously from the liquid ejection holes 8, that is, the droplet amount (volume) adjusted by the number of droplet ejections. For this reason, the number of droplet discharges corresponding to the specified gradation expression is continuously performed from the liquid discharge hole 8 corresponding to the specified dot region. In general, when liquid ejection is performed continuously, it is preferable that the interval between pulses supplied to eject liquid droplets is AL. As a result, the period of the residual pressure wave of the pressure generated when discharging the previously discharged liquid droplet coincides with the pressure wave of the pressure generated when discharging the liquid droplet discharged later, and these are superimposed. Thus, the pressure for discharging the droplet can be amplified. In this case, it is considered that the speed of the liquid droplets ejected later increases, but this is preferable because the landing points of a plurality of liquid droplets are close.

  FIG. 8 is a longitudinal section of a liquid discharge head according to another embodiment of the present invention. The liquid discharge head 202 shown in FIG. 8 is further provided with a heat dissipating unit 99 in addition to the liquid discharge head 2 described above.

In the liquid discharge head 2 described above, by providing the connection substrate 80 or the like, it is possible to suppress the intrusion of the liquid droplets into the cover member 90. By adopting such a structure, the liquid discharge head The exhaust heat upward of 2 will be reduced. Heat generated by the driver IC 55 and the like is transmitted to the cover member 90 and is mainly exhausted from the entire cover member 90. However, the connection board 80 is often made of a resin, and even if the thermal conductivity of the connection board 80 is high to some extent, it is considered that the thermal conductivity of the connection part with the lid 90a is not so good. In addition, such a liquid discharge head 2 may be placed in a plurality of adjacent positions so as to make it difficult for heat to be discharged sideways in order to increase multicolor printing and printing speed. It is preferable that heat is exhausted from above the head 2.

  Therefore, in the liquid discharge head 202, the cover member main body 90 a is provided with a heat radiating portion 99 that extends from the side surface between the liquid discharge head main body 13 and the connection substrate 80 to above the connection substrate 80. Thereby, the heat of the driver IC 55 is transmitted to the heat radiating portion 99 through the cover member main body 90a, and is transmitted to the portion of the heat radiating portion 99 above the connection substrate 80 and is radiated to the outside. The heat dissipating part 99 preferably has a high thermal conductivity, and is preferably a metal. Further, it is preferable that the heat dissipating part 99 is provided at a position overlapping the driver IC 55 with the cover member main body 90a interposed therebetween because heat is more easily transmitted. The heat dissipating part 99 and the cover member main body 90a may be bonded, but it is preferable that the heat dissipating part 99 and the cover member main body 90a are in direct contact with each other because heat is more easily transmitted. In this case, the fixing is performed using, for example, a screw, or the shape of the heat radiating part 99 is sandwiched between the cover member main body 90a, and is fixed using elastic deformation of the heat radiating part 99.

  The heat dissipating part 99 is provided with a hole 99a of the heat dissipating part so that the wiring connected to the external connector 82 from the outside passes. If the opening area of the hole 99a of the heat radiating portion is made smaller than the area of the upper surface of the liquid discharge head 202, the amount of mist adhering to the connection substrate 80 is reduced, so that the mist is less likely to enter the cover member 90. .

  In addition, a refrigerant flow path 99b is provided in a portion of the heat dissipation portion 99 above the connection substrate 80. The refrigerant flow path 99b is provided over substantially the entire length of the liquid discharge head 202, and is open to the outside at both ends of the liquid discharge head 202 in the length direction. Exhaust heat from the liquid discharge head 202 can be made smoother by passing the refrigerant through the refrigerant flow path 99b. The refrigerant is air, but if it is liquid, the exhaust heat efficiency can be improved. When such liquid discharge heads 202 are used in parallel, the printing accuracy can be improved by bringing the positions in the short direction closer to each other. However, the closer the position, the more disadvantageous for the exhaust heat, but the provision of the exhaust heat part 99 that does not greatly increase the dimension in the short direction as described above enables efficient exhaust heat. Become. Further, it is preferable that the refrigerant pass through the refrigerant flow path 99b extending in the longitudinal direction so that the dimension does not increase much in the short direction.

  In this embodiment, the displacement element 50 using piezoelectric deformation is shown as the pressurizing unit. However, the present invention is not limited to this, and any other device that can pressurize the liquid in the liquid pressurizing chamber 10 may be used. For example, the liquid in the liquid pressurizing chamber 10 may be heated and boiled to generate pressure, or may be one using MEMS (Micro Electro Mechanical Systems).

  The liquid discharge head 2 as described above is manufactured as follows, for example. A tape composed of a piezoelectric ceramic powder and an organic composition is formed by a general tape forming method such as a roll coater method or a slit coater method, and a plurality of green sheets that become piezoelectric ceramic layers 21a and 21b after firing are produced. . An electrode paste to be the common electrode 34 is formed on a part of the green sheet by a printing method or the like. Further, a via hole is formed in a part of the green sheet as necessary, and a via conductor is filled in the via hole.

  Next, each green sheet is laminated to produce a laminate, and pressure adhesion is performed. The laminated body after pressure contact is fired in a high-concentration oxygen atmosphere, and then the individual electrode 35 is printed on the surface of the fired body using an organic gold paste. After firing, the connection electrode 36 is printed using an Ag paste. And the piezoelectric actuator unit 21 is produced by baking.

Next, the flow path member 4 is produced by laminating plates 22 to 31 obtained by a rolling method or the like via an adhesive layer. Plates 22 to 31 are connected to manifold 5, individual supply flow path 6, and liquid pressurizing chamber 1.
The holes to be 0 and descenders are processed into a predetermined shape by etching.

  These plates 22 to 31 are preferably formed of at least one metal selected from the group consisting of Fe—Cr, Fe—Ni, and WC—TiC, particularly when ink is used as a liquid. Since it is desired to be made of a material having excellent corrosion resistance against ink, Fe-Cr is more preferable.

  Similarly, the branch channel member 60 is produced by laminating and bonding plates 60a to 60c having various holes.

  The reservoir channel member 40 was bonded by combining an injection molded reservoir channel body 40a and plate 50b, a filter 45 and a damper 47.

  The piezoelectric actuator unit 21 and the flow path member 4 can be laminated and bonded via an adhesive layer, for example. A well-known adhesive layer can be used as the adhesive layer, but in order not to affect the piezoelectric actuator unit 21 and the flow path member 4, an epoxy resin, phenol resin, polyphenylene having a thermosetting temperature of 100 to 150 ° C. It is preferable to use at least one thermosetting resin adhesive selected from the group of ether resins. By heating to the thermosetting temperature using such an adhesive layer, the piezoelectric actuator unit 21 and the flow path member 4 can be heat-bonded.

  Next, in order to electrically connect the piezoelectric actuator unit 21 and the control circuit 100, a silver paste is supplied to the connection electrode 36, an FPC which is a signal transmission unit 92 on which a driver IC 55 is mounted in advance is placed, and heat is applied. In addition, the silver paste is cured and electrically connected. The driver IC 55 was mounted by electrically flip chip connecting to the signal transmission unit 92 with solder, and then supplying a protective resin around the solder and curing it.

  Subsequently, the branch flow channel member 60 and the flow channel member 4 can be laminated and bonded via an adhesive layer, for example. A well-known adhesive layer can be used as the adhesive layer, but in order not to affect the piezoelectric actuator unit 21 and the flow path member 4, an epoxy resin, phenol resin, polyphenylene having a thermosetting temperature of 100 to 150 ° C. It is preferable to use at least one thermosetting resin adhesive selected from the group of ether resins. By heating to the thermosetting temperature using such an adhesive layer, the branch flow channel member 60 and the flow channel member 4 can be heat-bonded.

  Subsequently, the heat insulating elastic member 95 is attached to a predetermined position of the elastic plate 96 with resin or the like. A signal distribution board 86 on which a connector 95 is mounted in advance is sandwiched between an elastic plate 96 attached with rubber as the heat insulating elastic member 95 and the branch channel member 60, and the elastic plate 96 and the branch channel member 60 are joined with screws. In addition, the signal distribution board 86 was fixed.

  Further, the signal transmission unit 92 is turned up, and one end of the signal transmission unit 92 is inserted into the connector 95 and fixed. Thereafter, the side plate 90b is attached to the second flow path member with screws, the upper cover member 90a is fitted, and the upper cover member 90a is fixed to the elastic plate 96 with screws, whereby the liquid discharge head 2 can be manufactured.

DESCRIPTION OF SYMBOLS 1 ... Printer 2, 202 ... Liquid discharge head 4 ... Flow path member 4a ... Liquid discharge hole surface 5 ... Manifold 5a ... Sub manifold 5b ... Manifold opening (liquid introduction Hole)
5c ... Liquid supply path 6 ... Individual supply flow path 8 ... Liquid discharge hole 9 ... Liquid pressurization chamber group 10 ... Liquid pressurization chamber 11a, b, c, d ... Liquid Pressurization chamber row 12 ... Squeeze 13 ... Liquid discharge head body 15a, b, c, d ... Liquid discharge hole row 21 ... Piezoelectric actuator unit (pressure unit)
21a: Piezoelectric ceramic layer (diaphragm)
21b: Piezoelectric ceramic layer 22-31: Plate 32 ... Individual flow path 34 ... Common electrode 35 ... Individual electrode 36 ... Connection electrode 40 ... Reservoir flow path member 41b ...・ Liquid introduction hole in reservoir channel 50 ... Displacement element (piezoelectric actuator)
60 ... Branch channel member 63 ... Concavity in which the piezoelectric actuator is accommodated 65 ... Heater 80 ... Connection substrate 80a ... Connection substrate wiring 82 ... External connector 84 ... Internal connector 86 ... Signal distribution board 88 ... Guide frame 90 ... Cover member 90a ... Cover member body 90b ... Lid 90ba ... Hole in cover member 92 ... Signal transmission part 94 ... Board 95 ... Connector 96 ... Elastic plate 97 ... Thermal insulation member 99 ... Heat radiation part 99a ... Hole in heat radiation part (through external wiring) 99b ... Refrigerant flow path

Claims (8)

  1. A liquid discharge head body including a pressure unit for discharging liquid;
    A cover member provided so as to cover a part of the liquid discharge head body, and having an opening in a part thereof;
    A liquid discharge head having a connection substrate joined to the cover member so as to close the opening ,
    The connection board includes a connection portion connected to an external wiring outside the cover member, and is electrically connected to the pressure unit ,
    The terminal of the connection part is connected to the wiring arranged on the inner surface of the cover member in the connection board through the through hole arranged in the connection board,
    A liquid discharge head, wherein no wiring is disposed on an outer surface of the cover member of the connection substrate .
  2. The liquid discharge head according to claim 1, wherein the through hole is filled with a brazing material.
  3. A liquid discharge head body including a pressure unit for discharging liquid;
    A cover member provided so as to cover a part of the liquid discharge head body, and having an opening in a part thereof;
    A liquid discharge head having a connection substrate joined to the cover member so as to close the opening,
    The connection board includes a connection portion connected to an external wiring outside the cover member, and is electrically connected to the pressure unit,
    The electrical connection between the pressure unit and the connection board is via a removable internal connector mounted on the connection board, and the cover member is attached to and detached from the cover member body and the cover member body. possible, the liquid discharge head you characterized in that it is made from a lid having the opening.
  4. A plurality of pressure units and a signal distribution board;
    The signal distribution board is disposed in the cover member, a connector connected to the internal connector of the connection board, and a wiring for distributing a signal input from the connector to the plurality of pressure units. The liquid discharge head according to claim 3, further comprising:
  5.   5. The liquid ejection head according to claim 3, wherein the internal connector is surface-mounted on a main surface facing the inside of the cover member of the connection board.
  6. The terminal of the connection part is connected to the wiring arranged on the inner surface of the cover member in the connection board through the through hole arranged in the connection board,
    The liquid discharge head according to claim 3 , wherein no wiring is disposed on an outer surface of the cover member in the connection substrate .
  7. A liquid discharge head body including a pressure unit for discharging liquid;
    A cover member provided so as to cover a part of the liquid discharge head body, and having an opening in a part thereof;
    A connection board which is joined to the cover member so as to close the opening, and which has a connection portion connected to an external wiring outside the cover member, and is electrically connected to the pressure unit; Have
    The liquid discharge head body is disposed at a position facing the connection substrate;
    It said cover member, said liquid discharge head body from between the connection substrate, the connecting position the liquid discharge head you characterized Rukoto to having a heat radiating portion extending to more than the connection portion of the substrate.
  8. A liquid ejection head according to any one of claims 1 to 7,
    A transport unit for transporting a recording medium to the liquid discharge head;
    A controller for controlling the liquid ejection head body, connected to the connection section of the liquid ejection head, and electrically connected to the liquid ejection head body via the connection substrate. A recording device.
JP2011217405A 2010-09-30 2011-09-30 Liquid discharge head and recording apparatus using the same Active JP5822624B2 (en)

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JP5932490B2 (en) * 2012-05-30 2016-06-08 京セラ株式会社 Liquid discharge head and recording apparatus using the same
JP5956319B2 (en) * 2012-11-29 2016-07-27 京セラ株式会社 Liquid discharge head and recording apparatus using the same
JP6148184B2 (en) * 2014-01-24 2017-06-14 京セラ株式会社 Liquid discharge head and recording apparatus using the same
JP2017081049A (en) * 2015-10-30 2017-05-18 セイコーエプソン株式会社 Liquid discharge device
JP6134030B2 (en) * 2016-04-15 2017-05-24 京セラ株式会社 Liquid discharge head and recording apparatus using the same
JP6166419B2 (en) * 2016-04-21 2017-07-19 京セラ株式会社 Liquid discharge head and recording apparatus using the same
US10654269B2 (en) 2017-06-28 2020-05-19 Canon Kabushiki Kaisha Liquid ejection head
JP2019014110A (en) 2017-07-05 2019-01-31 キヤノン株式会社 Liquid discharge head
JPWO2019058445A1 (en) * 2017-09-20 2020-10-15 コニカミノルタ株式会社 Inkjet head and inkjet recorder
JP2019084754A (en) * 2017-11-07 2019-06-06 エスアイアイ・プリンテック株式会社 Liquid jet head and liquid jet recording device
JP2020082444A (en) * 2018-11-21 2020-06-04 セイコーエプソン株式会社 Inkjet head
WO2020158905A1 (en) * 2019-01-31 2020-08-06 京セラ株式会社 Liquid ejecting head and recording device

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JP4304941B2 (en) * 2002-08-30 2009-07-29 コニカミノルタホールディングス株式会社 Frame structure of recording head, recording head, and printer
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