JP6641769B2 - Liquid ejection head, liquid ejection unit, and device for ejecting liquid - Google Patents

Description

  The present invention relates to a liquid ejection head, a liquid ejection unit, and an apparatus for ejecting liquid.

  A liquid discharge head (droplet discharge head) includes a plurality of pressure generating means corresponding to a plurality of nozzles for discharging liquid, and a substrate on which a driver IC for outputting a drive waveform to each pressure generating means is mounted. is there.

  Conventionally, a drive voltage supply line for supplying a drive voltage along the long side direction is provided below the driver IC on the actuator substrate, and an input terminal provided on a short side edge portion of the driver IC is connected to the drive voltage supply line. In addition, there is known a device that is connected to a drive voltage supply line via a connection line (lead line) that intersects a short side of a driver IC in a plan view (Patent Document 1).

JP 2012-171149 A

  In the configuration disclosed in Patent Literature 1 described above, a lead wire that connects the drive voltage supply wire and the external wire is arranged from the short side of the driver IC where a large number of input / output terminals are arranged. The pattern width of the lead wiring connected to the drive voltage supply wiring is reduced. Therefore, it is difficult to secure the current capacity of the drive voltage supply wiring.

  On the other hand, in order to increase the pattern width of the lead wiring for connecting the drive voltage supply wiring and the external wiring, the short side of the driver IC must be widened, which causes a problem that the driver IC becomes large.

  The present invention has been made in view of the above problems, and has as its object to secure a current capacity of a drive voltage supply wiring without increasing the size of a driver IC.

In order to solve the above-mentioned problems, a liquid discharge head according to claim 1 of the present invention is provided.
A plurality of pressure generating means corresponding to a plurality of nozzles for discharging liquid,
A substrate on which a driver IC that outputs a drive waveform to the pressure generating means is mounted,
The substrate is provided with a drive voltage supply wiring for supplying a drive voltage of the pressure generating means,
In a plan view, the driver IC has a rectangular shape having a short side and a long side, and at least a part of the drive voltage supply wiring crosses a long side of the driver IC ,
A plurality of terminal rows in which a plurality of terminals are arranged in a short side direction of the driver IC are arranged in a longitudinal direction along a long side,
The terminal at the end in the short direction along the short side of the terminal row inside the driver IC is a GND terminal,
The wiring to the GND terminal is arranged between the wiring to another terminal arranged in the short direction and the driving voltage supply wiring .

  According to the present invention, the current capacity of the drive voltage supply wiring can be secured without increasing the size of the driver IC.

FIG. 4 is an exploded perspective view illustrating an example of a liquid ejection head according to the invention. FIG. 3 is a cross-sectional explanatory view of a main part along a direction orthogonal to the nozzle arrangement direction. FIG. 3 is an enlarged sectional explanatory view of a main part of FIG. 2. FIG. 3 is an explanatory view of a relevant part cross section in the same nozzle arrangement direction. FIG. 3 is an explanatory plan view of the vicinity of a short side of a driver IC on an actuator substrate according to the first embodiment of the present invention. FIG. 3 is a cross-sectional view of a main part for describing a first example of a connection structure between a terminal of an actuator substrate and a terminal of a driver IC; It is a principal part sectional explanatory view similarly used for description of the 2nd example. It is a principal part sectional explanatory view similarly used for description of the 3rd example. It is a plane explanatory view near a short side of a driver IC on an actuator board in a second embodiment of the present invention. It is a plane explanatory view near a short side of a driver IC on an actuator board in a third embodiment of the present invention. It is a plane explanatory view near a short side of a driver IC on an actuator board in a fourth embodiment of the present invention. It is a plane explanatory view near a short side of a driver IC on an actuator board in a fifth embodiment of the present invention. It is a plane explanatory view near a short side of a driver IC on an actuator board in a sixth embodiment of the present invention. It is a plane explanatory view near a short side of a driver IC on an actuator board in a seventh embodiment of the present invention. It is a plane explanatory view of an actuator board in an 8th embodiment of the present invention. FIG. 2 is an explanatory plan view of a main part of an example of an apparatus for discharging liquid according to the present invention. It is a principal part side explanatory view of the apparatus. FIG. 11 is an explanatory plan view of a main part of another example of the liquid ejection unit according to the present invention. FIG. 13 is a front explanatory view of still another example of the liquid ejection unit according to the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. An example of the liquid ejection head according to the present invention will be described with reference to FIGS. 1 is an exploded perspective view of the liquid discharge head, FIG. 2 is a cross-sectional view along a direction orthogonal to the nozzle arrangement direction, FIG. 3 is an enlarged cross-sectional view of a main part of FIG. 2, and FIG. It is principal part sectional explanatory drawing which follows.

  This liquid ejection head includes a nozzle plate 1, a flow path plate 2, a vibration plate 3, a piezoelectric element 11 as a pressure generating means, a holding substrate 50, and a frame member 70 also serving as a common liquid chamber member. I have.

  Also in the present embodiment, a portion composed of the flow path plate 2, the vibration plate 3, and the piezoelectric element 11 is referred to as an "actuator substrate 20" as an actuator member according to the present invention. However, this does not mean that the nozzle plate 1, the holding substrate 50, and the frame member 70 are joined after the independent member is formed as the actuator substrate 20.

  The nozzle plate 1 is formed with a plurality of nozzles 4 for discharging droplets. Here, two nozzle rows in which the nozzles 4 are arranged are arranged.

  The flow path plate 2, together with the nozzle plate 1 and the vibration plate 3, form an individual liquid chamber 6 communicating with the nozzle 4, a fluid resistance portion 7 communicating with the individual liquid chamber 6, and a liquid introduction portion (passage) 8 communicating with the fluid resistance portion 7. are doing.

  The liquid introduction section 8 communicates with a common liquid chamber 10 formed by the frame member 70 via a passage (supply port) 9 of the diaphragm 3 and a flow path 10A which is a part of the common liquid chamber of the holding substrate 50. . The liquid is supplied to the common liquid chamber 10 of the frame member 70 from the outside via the supply port 72.

  The vibration plate 3 forms a deformable vibration region 30 that forms a part of the wall surface of the individual liquid chamber 6. A piezoelectric element 11 is provided integrally with the vibration area 30 on the surface of the vibration area 3 opposite to the individual liquid chamber 6 in the vibration area 30, and a piezoelectric actuator is formed by the vibration area 30 and the piezoelectric element 11. I have.

  The piezoelectric element 11 is formed by sequentially laminating a lower electrode 13, a piezoelectric layer (piezoelectric body) 12, and an upper electrode 14 from the vibration region 30 side. An insulating film 21 is formed on the piezoelectric element 11.

  A lower electrode 13 serving as a common electrode of the plurality of piezoelectric elements 11 is connected to a common electrode power supply wiring pattern 102 via a common electrode wiring 15.

  The upper electrode 14 serving as an individual electrode of the piezoelectric element 11 is connected to a driving IC (driver IC) 210 via the individual electrode wiring 16.

  The driver IC 210 is mounted on the actuator substrate 20 by flip chip bonding so as to cover a region between the piezoelectric element rows.

  From the I / O (input / output terminal), power supply terminal, drive waveform (drive signal) input terminal, etc. of the driver IC 210 mounted on the actuator board 20, wiring is drawn out to the connection terminal group 18, as shown in FIG. Have been.

  Wiring provided on a wiring member 60 such as an FPC or FFC is electrically connected to each connection terminal of the connection terminal row 18 by ACF connection, solder connection, wire bonding, or the like. The end side is connected to a control unit arranged on the apparatus main body side.

  Note that the wiring member 60 is included in the frame member 70 and is drawn out of the head from the drawing port 71. Each connection terminal of the connection terminal group 18 is arranged in a plane at an end of the actuator substrate 20.

  A holding substrate 50 is formed on the actuator substrate 20 to form a concave portion (vibration chamber) 51 for accommodating the piezoelectric element 11.

  The holding substrate 50 also forms a flow path 10A that is a part of the common liquid chamber 10. This holding substrate 50 is joined to the diaphragm 3 side of the actuator substrate 20 by an adhesive.

  In the liquid ejection head thus configured, by applying a voltage between the upper electrode 14 and the lower electrode 13 of the piezoelectric element 11 from the driver IC 210, the piezoelectric layer 12 expands in the electrode stacking direction, that is, the electric field direction, It contracts in a direction parallel to the vibration region 30.

  At this time, since the lower electrode 13 side is constrained by the vibration region 30, a tensile stress is generated on the lower electrode 13 side of the vibration region 30, the vibration region 30 bends toward the individual liquid chamber 6, and the internal liquid is applied. The pressure causes the liquid to be discharged from the nozzle 4.

  Next, a first embodiment of the present invention will be described with reference to FIG. FIG. 5 is an explanatory plan view of the vicinity of the short side of the driver IC on the actuator substrate in the same embodiment. The driver IC is shown in a transparent state (the same applies to the following embodiments).

  As described above, the driver IC 210 having a rectangular shape in plan view is mounted on the actuator substrate 20 by flip-chip mounting.

  Here, a drive voltage output terminal 212 that outputs a drive voltage (drive waveform) to the piezoelectric element 11 is arranged in the driver IC 210 in the longitudinal direction along the long side 211.

  The driving voltage output terminal 212 is connected to an individual electrode (upper part) of the piezoelectric element 11 via an individual electrode wiring 213 (the same as the above-mentioned “individual electrode wiring 16”) which is a driving voltage output wiring for applying a driving voltage to the piezoelectric element 11. (Electrode) 14.

  In the driver IC 210, a plurality of GND terminals for various signals and terminals 216 serving as input / output terminals (I / O terminals) are arranged along the short side 215. Various signals, such as data, a shift clock, a latch, and a droplet size selection signal, are sent from the higher-level control unit to the plurality of terminals 216 via the wiring members 217 via the wiring members 60.

  On the other hand, on the actuator substrate 20, a drive voltage supply wiring 222 for supplying a drive voltage for the piezoelectric element 11 is provided. At least a part (here, all) of the drive voltage supply wiring 222 intersects with the long side 211 of the driver IC 210.

  Note that the driving voltage supply wiring means a wiring for supplying a driving voltage of the pressure generating means, and here, means a wiring for supplying a driving voltage of the piezoelectric element 11.

  Further, “intersection” is a state in which the outline (outline) of the drive voltage supply wiring 222 intersects the long side 211 of the driver IC 210. Therefore, in a plan view, the drive voltage supply wiring 222 has a portion that is entirely located below the driver IC 210.

  The drive voltage supply wiring 222 includes a wiring part 224 disposed below the driver IC 210 mainly in the longitudinal direction of the driver IC 210 (meaning a direction along the long side 211) and a lead wiring part 223 connected to the wiring part 224. Have.

  The wiring portion 224 is a wiring pattern portion located below the driver IC 210 in a plan view and connected to the drive voltage input terminal 220 of the driver IC 210. In the present embodiment, a portion inside the outer shape of the driver IC 210 is referred to in a plan view.

  The lead-out wiring portion 223 is a wiring pattern portion connected to the above-described wiring member 60 and connected to a higher-order piezoelectric element driving power source. In the present embodiment, the drawing wiring portion 223 is a portion outside the outer shape of the driver IC 210 in plan view. And

  At this time, of the plurality of drive voltage output terminals 212 of the driver IC 210, the driver is disposed between the end face of the drive voltage output terminal 212e at the end in the longitudinal direction and the terminal 216e at the end of the terminals 216. On both the IC 210 side and the actuator substrate 20 side, a region 230 for two terminals or more is provided.

  The drive voltage supply wiring 222 can be disposed so as to cross the long side 211 of the driver IC 210 by passing through the region 230.

  In the present embodiment, the drive voltage supply terminal 221 connected to the drive voltage supply wiring 222 passing through the region 230 is arranged on the actuator substrate 20 side, and the corresponding drive voltage input terminal 220 is arranged on the driver IC 210 side. Thus, both terminals 221 and 220 are connected. Note that a configuration in which no terminal is arranged in the region 230 may be employed.

  That is, the edge of the long side 211 of the driver IC 210 has an area 230 near the edge of the short side 215 where no terminal other than the driving voltage input terminal 220 connected to the driving voltage supply wiring 222 is arranged. .

  At this time, the drive voltage input terminals 220 connected to the drive voltage supply wiring 222 of the driver IC 210 are arranged side by side in the longitudinal direction along the long side 211, and are inland that are not aligned in the short direction along the short side 215.

  The width (length) of the region 230 in the longitudinal direction is preferably equal to or more than the length (width) of three pitches at which two terminals can be arranged at the same interval as the drive voltage output terminal 212. If the width of the region 230 in the longitudinal direction is small, the current capacity of the drive voltage supply wiring 222 becomes insufficient, which causes disconnection and a drop in drive voltage.

  More preferably, the width of the region 230 in the longitudinal direction is at least half as large as the width of the drive voltage supply wiring 222 in a portion where at least a portion disposed below the driver IC 210 exists.

  In addition, the present invention can be applied to the drive voltage input terminal 220 of the driver IC 210 which is closer to the longest side 211 of the terminal row arranged on the short side 215 side of the driver IC 210 or close to the longest side 211. However, it is preferable that they are not arranged in the terminal row direction of the short side 215 of the driver IC 210. Since the drive voltage input terminal 220 of the driver IC 210 is arranged not at the short side 215 of the driver IC 210 but at the edge of the long side 211, the number of terminals arranged in the short side direction of the driver IC 210 can be reduced. Accordingly, the dimension of the driver IC 210 in the short side direction can be reduced.

  Here, different examples of the connection structure between the terminals of the actuator substrate and the terminals of the driver IC will be described with reference to FIGS. FIGS. 6 to 8 are cross-sectional views of a main part in a region 230 of FIG.

  In the first example shown in FIG. 6, the drive voltage input terminal 220 on the driver IC 210 side has a metal protrusion formed on the pad 231 by plating or stud bump. Note that portions other than the drive voltage input terminal 220 are covered with an insulating film 233.

  The drive voltage supply terminal 221 on the actuator substrate 20 side is a terminal in which an insulating film 232 covering the drive voltage supply wiring 222 is opened.

  In the second example shown in FIG. 7, the drive voltage input terminal 220 on the driver IC 210 side has a metal protrusion formed on the pad 231 by plating or stud bump. Note that portions other than the drive voltage input terminal 220 are covered with an insulating film 233.

  The drive voltage supply terminal 221 on the side of the actuator substrate 20 is formed by opening an insulating film 232 covering the drive voltage supply wiring 222 and forming metal protrusions by plating or stud bumps.

  In the third example shown in FIG. 8, the drive voltage input terminal 220 on the driver IC 210 side has a metal protrusion formed on the pad 231 by plating or stud bump. Note that portions other than the drive voltage input terminal 220 are covered with an insulating film 233.

  The drive voltage supply terminal 221 on the actuator substrate 20 side is formed by exposing a conductor itself forming the drive voltage supply wiring 222.

  With this configuration, the pattern width of the drive voltage supply wiring 222 can be widened, so that the current capacity can be increased. Then, the short side region of the driver IC 210 corresponding to the pattern width of the drive voltage supply wiring 222 is reduced (this embodiment is not used), so that the driver IC 210 does not increase in size.

  In this way, it is possible to suppress an increase in the size of the driver IC while securing the current capacity of the drive voltage supply wiring.

  Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 9 is an explanatory plan view of the vicinity of the short side of the driver IC on the actuator substrate in the same embodiment.

  In the present embodiment, the drive voltage supply wiring 222 is arranged so that a part thereof intersects the long side 211 of the driver IC 210 and the other part intersects the short side 215.

  Even in this case, the pattern width of the drive voltage supply wiring 222 can be increased without increasing the size of the driver IC 210 by the part of the drive voltage supply wiring 222 intersecting the long side 211 of the driver IC 210.

  Thus, it is possible to suppress an increase in the size of the driver IC while securing the current capacity of the drive voltage supply wiring.

  Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 10 is an explanatory plan view of the vicinity of the short side of the driver IC on the actuator substrate in the same embodiment.

  In the present embodiment, the width W1 in the longitudinal direction of the region 230 is equal to or larger than the width W2 of the wiring portion 224 of the drive voltage supply wiring 222.

  Thus, the driving voltage supply wiring 222 can be arranged without extremely narrowing the pattern width of the driving voltage supply wiring 222, and a larger current capacity can be secured.

  In each of the above-described embodiments, a plurality of drive voltage output terminals 212 are arranged along one long side 211 of the driver IC 210. A plurality of drive voltage output terminals 212 are arranged along both long sides 211. The output terminals 212 may be arranged.

  Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 11 is an explanatory plan view of the vicinity of the short side of the driver IC on the actuator substrate in the same embodiment.

  In the present embodiment, the individual electrode wiring 213 that connects the drive voltage output terminal 212 of the driver IC 210 and the individual electrode 14 of the piezoelectric element 11 is arranged to be inclined with respect to the long side 211 of the driver IC 210.

  That is, of the plurality of individual electrode wirings 213, the individual electrodes arranged at an angle θ larger than 0 ° with respect to a line (perpendicular line) L perpendicular to the long side 211 of the driver IC 210 in plan view. The wiring 213 exists.

  The lead wiring portion 223 of the drive voltage supply wiring 222 is arranged along the outer shape of the individual electrode wiring 213 at the longitudinal end. Note that, also in the present embodiment, a part of the drive voltage supply wiring 222 is arranged to intersect with the long side 211 of the driver IC 210, and the remaining part is arranged to intersect with the short side 215.

  With this configuration, the width of the lead-out wiring can be widened, so that the distance between the pressure generating means and the drive voltage output terminal can be shortened while securing the current capacity, and the head can be downsized. .

  Next, a fifth embodiment of the present invention will be described with reference to FIG. FIG. 12 is an explanatory plan view of the vicinity of the short side of the driver IC on the actuator substrate in the same embodiment.

  In this embodiment, the present invention is applied between adjacent driver ICs.

  That is, two driver ICs 210A and 210B are mounted on the actuator substrate 20 so as to be adjacent to each other in the longitudinal direction. The driver IC 210A and the driver IC 210B are connected in cascade by connecting the respective I / O terminals 216 with the wiring 241.

  The individual electrode wiring 213A from the driver IC 210A and the individual electrode wiring 213B from the driver IC 210B are arranged obliquely with respect to the long sides 211A and 211B of the driver ICs 210A and 210B in plan view.

  Here, since the arrangement intervals of the piezoelectric elements 11 are the same, the inclinations of the individual electrode wirings 213A and 213B are opposite to each other in a plan view at a portion where the driver ICs 210A and 210B are adjacent to each other. , On the individual electrode 14 side, the wiring is inclined in a direction approaching.

  As a result, a substantially triangular region 250 is formed in plan view by the individual electrode wirings 213A and 213B of the adjacent driver ICs 210A and 210B.

  Therefore, in this region 240, a bridging wiring 225 that connects the wiring part 224A of the driving voltage supply wiring 222 below the driver IC 210A and the wiring part 224B of the driving voltage supply wiring 222 below the driver IC 210B is arranged.

  As a result, the driver ICs 210A and 210B in the regions 230A and 230B have the wiring portions 224A and 224B, the bridging wiring portion 225 connecting the wiring portions 224A and 224B, and the driving voltage supply wiring 222 formed by the above-described lead-out wiring portion 223. Are arranged so as to intersect with the long sides 211A and 211B.

  Among the external shapes of the bridge wiring 225, the shape on the individual electrode wiring 213A or the individual electrode wiring 213B side is similar to the individual electrode wiring 213A or the individual electrode wiring 213B in plan view, and the long sides 211A of the driver ICs 210A and 210B are formed. It is inclined with respect to 211B.

  With this configuration, it is possible to suppress an increase in the size of the short side of the driver IC while securing the current capacity of the drive voltage supply wiring.

  Then, even if there is a portion where the intervals between the drive voltage output terminals are not equal in pitch at the connecting portion of the adjacent driver ICs, the pressure generating means can be arranged at equal pitch. This makes it possible to form a high-quality image without print unevenness. In addition, since individual electrode wiring can be wired in a small wiring area, downsizing and cost reduction can be achieved.

  Next, a sixth embodiment of the present invention will be described with reference to FIG. FIG. 13 is an explanatory plan view of the vicinity of the short side of the driver IC on the actuator substrate in the same embodiment.

  In the present embodiment, in the fourth embodiment, the individual electrode wirings 213A and 213B are arranged so as to be bent halfway between the drive voltage output terminals 212A and 212B and the individual electrode 14.

  As a result, the region 250 in which the bridge wiring portion 225 is arranged can be widened, and the current width can be increased by increasing the pattern width of the bridge wiring portion 225.

  The number of bends may be one or more. The greater the number of bends, the greater the effect, and the bend can be curved instead of bent.

  Next, a seventh embodiment of the present invention will be described with reference to FIG. FIG. 14 is an explanatory plan view of the vicinity of the short side of the driver IC on the actuator substrate in the same embodiment.

  In the present embodiment, two (multiple) terminal rows, an outer terminal row 18A and an inner terminal row 18B, are arranged near the short side 215 of the driver IC 210 at different positions in the longitudinal direction. Wiring 217 is connected to each terminal 216 of the terminal rows 18A and 18B.

  Since most of the wiring to the terminal row 18B inside the driver IC 210 needs to pass between the pads connecting the outer terminal row 18A, the wiring width is narrow like the pad-to-pad wiring 218.

  Among the terminals 216 of the terminal row 18B inside the driver IC 210, the wide wiring can be arranged without passing between the pads of the outer terminal row 18A is the terminal at the short side end along the short side 215. Similarly, a wide wiring can be arranged only for the wiring to the outer terminal row 18A.

  Therefore, by arranging the terminal 216g at the short end of the terminal row 18B inside the driver IC 210 so as to be a GND terminal, the GND wiring 217g is connected to another terminal 216 arranged in the short direction of the driver IC 210. Between the wiring 217 and the driving voltage supply wiring 222.

  As a result, the drive voltage supply wiring 222 through which the high voltage and large current flows is a noise source, but since the GND wiring 217g functions as a shield for the wiring 217 to the other terminal 216 arranged in the short direction of the driver IC 210, other wirings are provided. Superposition of noise on the signal wiring 217 can be suppressed.

  Next, an eighth embodiment of the present invention will be described with reference to FIG. FIG. 15 is an explanatory plan view of the actuator substrate in the same embodiment.

  This embodiment is a combination of the first, fifth, and seventh embodiments. Note that other embodiments can be combined as long as they do not conflict.

  Thereby, the operation and effect described in each embodiment can be obtained.

  Further, in the present embodiment, the drive voltage supply terminals 221A and 221B are not only arranged in the region 230 of FIG. 5 described above, but also a plurality of drive voltage output terminals respectively arranged along the long sides 211 on both sides of the driver IC 210. It is also arranged in a region between the terminals 212A and 212B.

  Thus, the drive voltage is supplied from the drive voltage supply wiring 222 at a plurality of locations in the arrangement direction of the drive voltage output terminals, so that the occurrence of a voltage difference depending on the location of the drive voltage output terminal is reduced.

  In each of the above-described embodiments, an example is described in which a plurality of drive voltage output terminals 212 are arranged along both long sides 211 of the driver IC 210. A plurality of drive voltage output terminals 212 are arranged along one long side 211. The output terminals 212 may be arranged.

  Next, an example of an apparatus for discharging a liquid according to the present invention will be described with reference to FIGS. FIG. 16 is an explanatory plan view of a main part of the apparatus, and FIG. 17 is an explanatory side view of an essential part of the apparatus.

  This device is a serial type device, and the carriage 403 reciprocates in the main scanning direction by the main scanning moving mechanism 493. The main scanning movement mechanism 493 includes a guide member 401, a main scanning motor 405, a timing belt 408, and the like. The guide member 401 is bridged between the left and right side plates 491A and 491B, and movably holds the carriage 403. The carriage 403 is reciprocated in the main scanning direction by the main scanning motor 405 via the timing belt 408 spanned between the driving pulley 406 and the driven pulley 407.

  On the carriage 403, a liquid discharge unit 440 in which the liquid discharge head 404 and the head tank 441 according to the present invention are integrated is mounted. The liquid discharge head 404 of the liquid discharge unit 440 discharges, for example, liquid of each color of yellow (Y), cyan (C), magenta (M), and black (K). The liquid ejection head 404 has a nozzle row composed of a plurality of nozzles 11 arranged in a sub-scanning direction orthogonal to the main scanning direction, and is mounted with the ejection direction facing downward.

  The liquid stored in the liquid cartridge 450 is supplied to the head tank 441 by a supply mechanism 494 for supplying the liquid stored outside the liquid discharge head 404 to the liquid discharge head 404.

  The supply mechanism 494 includes a cartridge holder 451, which is a filling section for mounting the liquid cartridge 450, a tube 456, a liquid sending unit 452 including a liquid sending pump, and the like. The liquid cartridge 450 is detachably mounted on the cartridge holder 451. The liquid is sent from the liquid cartridge 450 to the head tank 441 by the liquid sending unit 452 via the tube 456.

  This apparatus includes a transport mechanism 495 for transporting the sheet 410. The transport mechanism 495 includes a transport belt 412 as transport means, and a sub-scanning motor 416 for driving the transport belt 412.

  The transport belt 412 attracts the paper 410 and transports the paper 410 at a position facing the liquid ejection head 404. The transport belt 412 is an endless belt, and is stretched between a transport roller 413 and a tension roller 414. Suction can be performed by electrostatic suction or air suction.

  The transport belt 412 is rotated in the sub-scanning direction by rotating the transport roller 413 via the timing belt 417 and the timing pulley 418 by the sub-scanning motor 416.

  Further, on one side of the carriage 403 in the main scanning direction, a maintenance and recovery mechanism 420 for maintaining and recovering the liquid ejection head 404 is arranged on the side of the transport belt 412.

  The maintenance and recovery mechanism 420 includes, for example, a cap member 421 for capping the nozzle surface (the surface on which the nozzle is formed) of the liquid ejection head 404, a wiper member 422 for wiping the nozzle surface, and the like.

  The main scanning movement mechanism 493, the supply mechanism 494, the maintenance and recovery mechanism 420, and the transport mechanism 495 are attached to a housing including side plates 491A and 491B and a back plate 491C.

  In this apparatus configured as described above, the paper 410 is fed onto the transport belt 412 and is adsorbed, and the paper 410 is transported in the sub-scanning direction by the orbital movement of the transport belt 412.

  Therefore, by driving the liquid discharge head 404 according to the image signal while moving the carriage 403 in the main scanning direction, the liquid is discharged onto the stopped paper 410 to form an image.

  As described above, since this apparatus includes the liquid ejection head according to the present invention, a high-quality image can be stably formed.

  Next, another example of the liquid ejection unit according to the present invention will be described with reference to FIG. FIG. 18 is an explanatory plan view of a main part of the unit.

  The liquid discharge unit includes a housing portion including side plates 491A and 491B and a back plate 491C, a main scanning movement mechanism 493, a carriage 403, It comprises a discharge head 404.

  In addition, a liquid discharge unit in which at least one of the above-described maintenance and recovery mechanism 420 and the supply mechanism 494 is further attached to, for example, the side plate 491B of the liquid discharge unit may be configured.

  Next, still another example of the liquid ejection unit according to the present invention will be described with reference to FIG. FIG. 19 is an explanatory front view of the unit.

  This liquid discharge unit includes a liquid discharge head 404 having a flow path component 444 attached thereto, and a tube 456 connected to the flow path component 444.

  The flow path component 444 is disposed inside the cover 442. A head tank 441 may be included instead of the flow path component 444. Further, a connector 443 for making an electrical connection with the liquid ejection head 404 is provided above the flow path component 444.

  In the present application, a “device that discharges liquid” is a device that includes a liquid discharge head or a liquid discharge unit and drives the liquid discharge head to discharge liquid. The device that discharges a liquid includes not only a device that can discharge a liquid to which a liquid can be attached, but also a device that discharges a liquid into the air or into the liquid.

  The “device for discharging liquid” may include a unit for feeding, transporting, and discharging paper to which liquid can be attached, as well as a pre-processing device and a post-processing device.

  For example, as a “device for discharging a liquid”, an image forming device that is a device for discharging a liquid to form an image on a medium, and forming a layer of powder in order to form a three-dimensional object There is a three-dimensional modeling device (three-dimensional modeling device) that discharges a modeling liquid to the formed powder layer.

  Further, the “device for discharging liquid” is not limited to a device in which a significant image such as a character or a graphic is visualized by the discharged liquid. For example, those that form a pattern or the like that has no meaning in itself, and those that form a three-dimensional image are also included.

  The above-mentioned "liquid can be attached" means a liquid can be attached even temporarily. The material to which "the liquid adheres" may be paper, thread, fiber, cloth, leather, metal, plastic, glass, wood, ceramics, etc., as long as the liquid can be adhered even temporarily.

  The “liquid” also includes ink, a processing liquid, a DNA sample, a resist, a pattern material, a binder, a modeling liquid, and the like.

  Further, the “device that discharges liquid” includes both a serial type device that moves a liquid discharge head and a line type device that does not move a liquid discharge head, unless otherwise specified.

  Other examples of the “liquid discharging device” include a processing liquid coating device that discharges a processing liquid onto a paper in order to apply the processing liquid to the surface of the paper for the purpose of modifying the surface of the paper, and a raw material. There is an injection granulation apparatus that granulates the fine particles of the raw material by spraying a liquid composition dispersed in a solution through a nozzle.

  The “liquid discharge unit” is a unit in which functional components and mechanisms are integrated with a liquid discharge head, and is an assembly of components related to liquid discharge. For example, the “liquid ejection unit” includes a combination of at least one of a head tank, a carriage, a supply mechanism, a maintenance and recovery mechanism, and a main scanning movement mechanism with a liquid ejection head.

  Here, the term “integration” means, for example, a case where the liquid ejection head and the functional component or mechanism are fixed to each other by fastening, bonding, engagement, or the like, or a case where one is movably held with respect to the other. Including. Further, the liquid ejection head, the functional component, and the mechanism may be configured to be detachable from each other.

  For example, as a liquid discharge unit, there is a liquid discharge unit in which a liquid discharge head and a head tank are integrated as in a liquid discharge unit 440 shown in FIG. In some cases, the liquid ejection head and the head tank are integrated with each other by a tube or the like. Here, a unit including a filter can be added between the head tank and the liquid discharge head of these liquid discharge units.

  There is a liquid discharge unit in which a liquid discharge head and a carriage are integrated.

  Further, as a liquid discharge unit, there is a liquid discharge head in which a liquid ejection head is movably held by a guide member constituting a part of a scanning movement mechanism, and the liquid ejection head and the scanning movement mechanism are integrated. As shown in FIG. 18, there is a liquid discharge unit in which a liquid discharge head, a carriage, and a main scanning moving mechanism are integrated.

  Further, as a liquid discharge unit, there is a liquid discharge head in which a cap member which is a part of a maintenance / recovery mechanism is fixed to a carriage to which a liquid discharge head is attached, and the liquid discharge head, the carriage, and the maintenance / recovery mechanism are integrated. .

  Further, as shown in FIG. 19, there is a liquid discharge unit in which a tube is connected to a liquid discharge head to which a head tank or a flow path component is attached, and a liquid discharge head and a supply mechanism are integrated. .

  The main scanning movement mechanism includes a guide member alone. The supply mechanism also includes a tube unit and a loading unit alone.

  Further, the "liquid ejection head" is not limited to the pressure generating means used. For example, in addition to the piezoelectric actuator described in the above embodiment (a stacked piezoelectric element may be used), a thermal actuator using an electrothermal conversion element such as a heating resistor, a diaphragm and a counter electrode are provided. An actuator using an electrostatic actuator or the like may be used.

  Further, image forming, recording, printing, printing, printing, molding, and the like in the terms of the present application are all synonyms.

DESCRIPTION OF SYMBOLS 1 Nozzle plate 2 Flow path plate 3 Vibration plate 4 Nozzle 6 Individual liquid chamber 10 Common liquid chamber 11 Piezoelectric element 14 Upper electrode (individual electrode)
Reference Signs List 20 actuator substrate 50 holding substrate 60 wiring member 70 frame member 210, 210A, 210B driver IC
211 Long side 212, 212A, 212B Drive voltage output terminal 213, 213A, 213B Drive voltage output wiring (individual electrode wiring)
215 Short side 216 Terminal 217 Wiring 220 Driving voltage input terminal 221 Driving voltage supply terminal 222 Driving voltage supply wiring 224, 224A, 224B Wiring section 223 Leading wiring section 225 Cross-linked wiring section 230, 230A, 230B, 250 Area 403 Carriage 404 Liquid ejection Head 440 Liquid discharge unit

Claims (19)

A plurality of pressure generating means corresponding to a plurality of nozzles for discharging liquid,
A substrate on which a driver IC that outputs a drive waveform to the pressure generating means is mounted,
The substrate is provided with a drive voltage supply wiring for supplying a drive voltage of the pressure generating means,
In a plan view, the driver IC has a rectangular shape having a short side and a long side, and at least a part of the drive voltage supply wiring crosses a long side of the driver IC ,
A plurality of terminal rows in which a plurality of terminals are arranged in a short side direction of the driver IC are arranged in a longitudinal direction along a long side,
The terminal at the end in the short direction along the short side of the terminal row inside the driver IC is a GND terminal,
The liquid discharge head according to claim 1, wherein the wiring to the GND terminal is arranged between the wiring to another terminal arranged in the short direction and the driving voltage supply wiring . The driver IC has a plurality of input terminals connected to the drive voltage supply wiring,
It said plurality of input terminals, a liquid discharge head according to claim 1, characterized in that <br/> arranged side by side in the longitudinal direction along the long side of the driver IC. The drive voltage supply wiring has a wiring portion located in a region facing the driver IC and extending along a long side of the driver IC,
The liquid ejection head according to claim 2, wherein the wiring section and the plurality of input terminals are connected. 4. The device according to claim 1, wherein the edge of the long side of the driver IC has an area near the edge of the short side where no terminal other than the input terminal connected to the drive voltage supply wiring is arranged. 4. The liquid discharge head according to any one of 1 to 3. A drive voltage output wiring for transmitting the drive voltage from the driver IC to the pressure generating means is disposed obliquely with respect to a long side of the driver IC,
5. The liquid discharge head according to claim 1, wherein the drive voltage supply line is arranged along an outer shape of the drive voltage output line. 6. At least two driver ICs are mounted on the substrate and connected in cascade,
4. The driving voltage supply wiring, wherein a bridge wiring portion serving as a portion connecting between two adjacent driver ICs is routed outside a long side of the driver IC. 5. The liquid discharge head according to any one of 4. A drive voltage output line for applying the drive voltage from the driver IC to the pressure generating means is inclined with respect to a long side of the driver IC;
7. The liquid according to claim 6, wherein the bridging wiring portion of the driving voltage supply wiring is arranged in a region formed between the driving voltage output wirings from two adjacent driver ICs. Discharge head. 8. The liquid discharge head according to claim 7, wherein the drive voltage output wiring is bent or curved in a direction in which a region where the bridge wiring portion of the drive voltage supply wiring is arranged is widened. A liquid discharge unit, characterized in that it comprises a liquid discharge head according to any one of claims 1 to 8. A head tank for storing liquid to be supplied to the liquid discharge head, a carriage on which the liquid discharge head is mounted, a supply mechanism for supplying liquid to the liquid discharge head, a maintenance and recovery mechanism for maintaining and recovering the liquid discharge head, and the liquid 10. The liquid ejection unit according to claim 9 , wherein at least one of a main scanning movement mechanism for moving the ejection head in the main scanning direction and the liquid ejection head are integrated. Claims 1 to liquid discharge head according to any one of 8, or apparatus for ejecting liquid, characterized in that it comprises a liquid discharge unit according to claim 9 or 10.   A plurality of pressure generating means corresponding to a plurality of nozzles for discharging liquid,
  An input terminal comprising a rectangular driver IC having a short side and a long side for outputting a driving waveform to the pressure generating means, the input terminal including at least two adjacent driving voltage input terminals in a longitudinal direction along the long side. A driver IC arranged side by side,
  A substrate on which the driver IC is mounted,
  A drive voltage supply line for supplying a drive voltage of the pressure generating means on the substrate is electrically connected to the adjacent drive voltage input terminal in a direction perpendicular to the surface of the substrate,
  The drive voltage supply wiring has a width larger than that of covering the adjacent drive voltage input terminals in a region connected to the adjacent drive voltage input terminals.
A liquid ejection head characterized by the above-mentioned.   The plurality of drive voltage input terminals are disposed at an end of the long side.
13. The liquid discharge head according to claim 12, wherein:   In the driver IC, the drive voltage input terminal is arranged only in a longitudinal direction along the long side.
14. The liquid ejection head according to claim 12, wherein   The drive voltage supply wiring is located in a region facing the driver IC, and
Has a wiring portion extending along the long side of the Iva IC
The liquid ejection head according to claim 12, wherein:   A drive voltage output wiring for transmitting the drive voltage from the driver IC to the pressure generating means is disposed obliquely with respect to a long side of the driver IC,
  The drive voltage supply wiring is arranged along the outer shape of the drive voltage output wiring
The liquid ejection head according to claim 12, wherein:   At least two driver ICs are mounted on the substrate and connected in cascade,
  In the drive voltage supply wiring, a bridging wiring portion serving as a portion connecting between two adjacent driver ICs is routed outside a long side of the driver IC.
17. The liquid discharge head according to claim 12, wherein:   A drive voltage output line for applying the drive voltage from the driver IC to the pressure generating means is inclined with respect to a long side of the driver IC;
  The bridging wiring portion of the driving voltage supply wiring is provided between two adjacent driver ICs.
It is arranged in a region formed between the drive voltage output wirings
The liquid ejection head according to claim 17, wherein:   The drive voltage output wiring is bent or curved in a direction in which a region where the bridge wiring portion of the drive voltage supply wiring is arranged is widened.
The liquid ejection head according to claim 18, wherein:

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