JP2020157775A - Liquid jet head and liquid jet device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid injection head and a liquid injection device provided with a flow path member capable of reducing the size and securing a larger area in which a liquid flow path can be arranged. SOLUTION: A plurality of head main bodies 110 having a liquid jet surface 20a on which ink is jetted, a COF substrate 98 connected to each head main body 110, and a flow path 240 for supplying ink to each head main body 110 are provided. The flow path member 200 has a plurality of openings 201 through which the COF substrate 98 is inserted, and the COF substrate 98 is extended toward the flow path member 200 with respect to the head body 110. Further, between the head body 110 and the flow path member 200, the flow path 240 is tilted toward the first surface 98a of both sides of the COF substrate 98, and the flow path 240 is on the second surface 98b side of both sides of the COF substrate 98. It is connected to the head body 110. [Selection diagram] FIG. 17

Description

The present invention relates to a liquid injection head and a liquid injection device, and more particularly to an inkjet recording head and an inkjet recording device that inject ink as a liquid.

As the liquid injection head, for example, a head body in which a pressure generating chamber communicating with a nozzle opening for ejecting ink droplets is deformed by a pressure generating means such as a piezoelectric element and ink droplets are ejected from the nozzle opening, and the head body is supplied to the head body. An inkjet recording head including a flow path member constituting a flow path of ink is known.

The head body is connected to a flow path member so that ink from the flow path is supplied to the head body or ink from the head body is discharged to the flow path. Further, the flow path member is provided with an opening through which the flexible wiring board is inserted so as to penetrate in the thickness direction. The flexible wiring board is connected to the pressure generating means of the head body via the lead electrode through the opening. Further, the flexible wiring board is connected to a connection board arranged on the side opposite to the head main body of the flow path member. The connection board is connected to the control unit, and the control signal of the control unit is transmitted to the pressure generating means via the connection board and the flexible wiring board (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2012-81644

On the other hand, the liquid injection head is required to have high resolution and miniaturization, and the flow path member is also required to be particularly miniaturized in the horizontal plane parallel to the liquid injection surface.

However, due to the miniaturization of the flow path member, the area in which the flow path can be formed becomes narrower, excluding the opening through which the flexible wiring board is inserted. That is, it becomes difficult to provide the flow path member with a horizontal flow path through which ink flows in the horizontal plane. Further, if the region where the flow path of the flow path member can be formed is narrow, the degree of freedom of routing the flow path is restricted, so that it is difficult to construct an optimum flow path according to the arrangement of the head body, for example. Become.

It should be noted that such a problem exists not only in the inkjet recording head that ejects ink, but also in the liquid injection head that ejects a liquid other than ink and the liquid injection device.

In view of such circumstances, the present invention provides a liquid injection head and a liquid injection device provided with a flow path member capable of reducing the size and securing a larger area in which a liquid flow path can be arranged. With the goal.

An aspect of the present invention for solving the above problems is a plurality of head bodies having a liquid injection surface on which a liquid is jetted, a flexible wiring board connected to each head body, and a flow for supplying liquid to each head body. The flow path member includes a flow path member provided with a path, the flow path member has a plurality of openings through which the flexible wiring board is inserted, and the flexible wiring board is located on the flow path member side with respect to the head body. It is extended and tilted toward the first surface side of both sides of the flexible wiring board between the head body and the flow path member, and the flow path is the second of both sides of the flexible wiring board. On the surface side, it has a portion provided along the liquid injection surface, and the first flow path and the second flow path are connected to the head main body, and the first flow path is the first flow path. On the one-side side, the first branch flow path is provided along the liquid injection surface, and the second flow path is provided on the second surface side along the liquid injection surface. The liquid injection head has a branch flow path, and the first branch flow path is closer to the head body in a direction orthogonal to the liquid injection surface than the second branch flow path.
In such an embodiment, by inclining the flexible wiring board toward the first surface side, the opening of the flow path member can also be moved to the first surface side, and the flow path of the flow path member is densely distributed in the area where the flow path can be formed. Can be provided. Let P be a dense region on the first surface side of the opening of the flow path member, and Q be a sparse region on the second surface side. In this way, since the flow path can be arranged in a wider area Q, it becomes easy to configure an optimum flow path according to the arrangement of the head body and the like. In particular, when the flow path along the liquid injection surface is provided, it is possible to prevent the flow path from interfering with the flexible wiring board. Further, in order to prevent interference with the flexible wiring board, the width of the liquid injection head in the above direction is smaller than that in the case where the flow path along the liquid injection surface is moved to the second surface side to widen the flow path member. Can be transformed into.
Further, in the region Q, the second branch flow path can be formed in the flow path member with a higher degree of freedom as compared with the case where the first branch flow path close to the head body is provided in the direction perpendicular to the liquid injection surface. .. Further, since a plurality of flow paths can be arranged so as to be stacked in a direction orthogonal to the liquid injection surface, the shape of the liquid injection head in the liquid injection surface can be miniaturized.
Here, the first flow path has a first vertical flow path that connects the first branch flow path and the head body on the first surface side and is along a direction perpendicular to the liquid injection surface. It is preferable that the second flow path has a second vertical flow path on the second surface side that connects the second branch flow path and the head body and runs in a direction perpendicular to the liquid injection surface. .. According to this, the ranges of the first vertical flow path and the second vertical flow path occupying the flow path member in the plan view seen from the direction perpendicular to the liquid injection surface are the first branch flow path and the second branch flow path. It is smaller than the range occupied by the flow paths that connect the head body at an angle. That is, by connecting the first branch flow path and the second branch flow path and the head main body by the first vertical flow path and the second vertical flow path, respectively, the size of the flow path member in the plan view is reduced. It becomes possible.
Further, a plurality of head bodies having a liquid injection surface on which liquid is ejected, a flexible wiring board connected to each head body, and a flow path member provided with a flow path for supplying liquid to each head body. The flow path member has a plurality of openings through which the flexible wiring board is inserted, and the flexible wiring board extends toward the flow path member with respect to the head body and is head body. And the flow path member are tilted toward the first surface side of both sides of the flexible wiring board, and the flow path is directed to the liquid injection surface on the second surface side of both sides of the flexible wiring board. A first flow path and a second flow path are connected to the head body, and the first flow path is provided on the first surface side of the flexible wiring board. The second flow path has a first branch flow path provided in a direction parallel to the liquid injection surface and a first cross flow path connected to the plurality of the first branch flow paths. On the second surface side of the flexible wiring board, a second branch flow path provided in a direction parallel to the liquid injection surface, and a second cross flow path connected to the plurality of the second branch flow paths. It is preferable that the first crossing flow path and the second crossing flow path are on opposite sides of the flexible wiring board in the plane direction of the flexible wiring board. According to this, the branch flow path can be formed in the flow path member with a higher degree of freedom as compared with the case where the branch flow path is provided in the region P. Further, since the intersecting flow paths are opposite to each other in the surface direction of the flexible wiring board, a plurality of flow paths can be arranged without overlapping in the direction orthogonal to the liquid injection surface. The shape of the liquid injection head in the direction orthogonal to the liquid injection surface can be miniaturized.
Further, the flexible wiring board has one end portion close to the head body and the other end portion far from the head body in a direction perpendicular to the liquid injection surface, and the other end portion is more than the one end portion. It is preferable that the width of the flexible wiring board in the surface direction is narrowed, and the second flow path is formed in the flow path member so as to pass through the outer region of the other end in the surface direction. According to this, a region for forming the second flow path can be provided on the outside of the flexible wiring board in the plane direction (direction parallel to the plane) of the flexible wiring board. As a result, the degree of freedom in arranging the second flow path in the flow path member is further improved.
Further, it is preferable that the drive circuit is provided on the second surface side of the flexible wiring board. According to this, by widening the width of the opening toward the first surface side, it is possible to more effectively suppress the drive circuit from coming into contact with the inner surface of the opening, and it is possible to protect the drive circuit. Even if the width of the opening is widened to the first surface side, the above-mentioned dense region P side is only further narrowed, and it is possible to avoid narrowing the sparse region Q side.
Another aspect of the present invention is a liquid injection device including the above liquid injection head.
In such an embodiment, there is provided a liquid injection device provided with a flow path member capable of reducing the size and securing a larger area in which the liquid flow path can be arranged.
Another aspect of the present invention for solving the above problems is to supply a plurality of head bodies having a liquid injection surface on which a liquid is jetted, a flexible wiring board connected to each head body, and a liquid for each head body. The flow path member is provided with a flow path member to be provided, the flow path member has a plurality of openings through which the flexible wiring board is inserted, and the flexible wiring board has the flow path member with respect to the head main body. It extends to the side and is tilted toward the first surface side of both sides of the flexible wiring board between the head body and the flow path member, and the flow path is of both sides of the flexible wiring board. The liquid injection head is characterized by having a portion provided along the liquid injection surface on the second surface side.
In such an embodiment, by inclining the flexible wiring board toward the first surface side, the opening of the flow path member can also be moved to the first surface side, and the flow path of the flow path member is densely distributed in the area where the flow path can be formed. Can be provided. Let P be a dense region on the first surface side of the opening of the flow path member, and Q be a sparse region on the second surface side. In this way, since the flow path can be arranged in a wider area Q, it becomes easy to configure an optimum flow path according to the arrangement of the head body and the like. In particular, when the flow path along the liquid injection surface is provided, it is possible to prevent the flow path from interfering with the flexible wiring board. Further, in order to prevent interference with the flexible wiring board, the width of the liquid injection head in the above direction is smaller than that in the case where the flow path along the liquid injection surface is moved to the second surface side to widen the flow path member. Can be transformed into.

Here, the first flow path and the second flow path are connected to the head main body, and the first flow path is provided on the first surface side along the liquid injection surface. The second branch flow path has one branch flow path, the second branch flow path has a second branch flow path provided along the liquid injection surface on the second surface side, and the first branch flow path has the said. It is preferable that the head body is closer to the head body in a direction orthogonal to the liquid injection surface than the second branch flow path. According to this, in the region Q, the second branch flow path is formed in the flow path member with a higher degree of freedom as compared with the case where the first branch flow path close to the head body is provided in the direction perpendicular to the liquid injection surface. be able to. Further, since a plurality of flow paths can be arranged so as to be stacked in a direction orthogonal to the liquid injection surface, the shape of the liquid injection head in the liquid injection surface can be miniaturized.

Further, the first flow path has a first vertical flow path that connects the first branch flow path and the head main body on the first surface side and is along a direction perpendicular to the liquid injection surface. The second flow path preferably has a second vertical flow path on the second surface side that connects the second branch flow path and the head body and runs in a direction perpendicular to the liquid injection surface. According to this, the ranges of the first vertical flow path and the second vertical flow path occupying the flow path member in the plan view seen from the direction perpendicular to the liquid injection surface are the first branch flow path and the second branch flow path. It is smaller than the range occupied by the flow paths that connect the head body at an angle. That is, by connecting the first branch flow path and the second branch flow path and the head main body by the first vertical flow path and the second vertical flow path, respectively, the size of the flow path member in the plan view is reduced. It becomes possible.

Further, a first flow path and a second flow path are connected to the head body, and the first flow path is parallel to the liquid injection surface on the second surface side of the flexible wiring board. It has a first branch flow path provided in a direction and a first cross flow path connected to a plurality of the first branch flow paths, and the second flow path is the second flow path of the flexible wiring board. On the surface side, it has a second branch flow path provided in a direction parallel to the liquid injection surface and a second cross flow path connected to the plurality of the second branch flow paths, and the first cross flow path is provided. It is preferable that the flow path and the second crossing flow path are on the opposite side of the flexible wiring board in the plane direction of the flexible wiring board. According to this, the branch flow path can be formed in the flow path member with a higher degree of freedom as compared with the case where the branch flow path is provided in the region P. Further, since the intersecting flow paths are opposite to each other in the surface direction of the flexible wiring board, a plurality of flow paths can be arranged without overlapping in the direction orthogonal to the liquid injection surface. The shape of the liquid injection head in the direction orthogonal to the liquid injection surface can be miniaturized.

Further, the flexible wiring board has one end portion close to the head body and the other end portion far from the head body in a direction perpendicular to the liquid injection surface, and the other end portion is more than the one end portion. It is preferable that the width of the flexible wiring board in the surface direction is narrowed, and the second flow path is formed in the flow path member so as to pass through the outer region of the other end in the surface direction. According to this, a region for forming the second flow path can be provided on the outside of the flexible wiring board in the plane direction (direction parallel to the plane) of the flexible wiring board. As a result, the degree of freedom in arranging the second flow path in the flow path member is further improved.

Further, it is preferable that the drive circuit is provided on the second surface side of the flexible wiring board. According to this, by widening the width of the opening toward the first surface side, it is possible to more effectively suppress the drive circuit from coming into contact with the inner surface of the opening, and it is possible to protect the drive circuit. Even if the width of the opening is widened to the first surface side, the above-mentioned dense region P side is only further narrowed, and it is possible to avoid narrowing the sparse region Q side.

Another aspect of the present invention is a liquid injection device including the above liquid injection head.
In such an embodiment, there is provided a liquid injection device provided with a flow path member capable of reducing the size and securing a larger area in which the liquid flow path can be arranged.

The schematic perspective view of the recording apparatus which concerns on Embodiment 1 of this invention. An exploded perspective view of the head unit according to the first embodiment of the present invention. The bottom view of the head unit which concerns on Embodiment 1 of this invention. The plan view of the recording head which concerns on Embodiment 1 of this invention. The bottom view of the recording head which concerns on Embodiment 1 of this invention. FIG. 4 is a sectional view taken along line AA'in FIG. An exploded perspective view of a head body according to the first embodiment of the present invention. Sectional drawing of the head body which concerns on Embodiment 1 of this invention. The figure which showed typically the arrangement of the nozzle opening of Embodiment 1 of this invention. The plan view of the flow path member (first flow path member) which concerns on Embodiment 1 of this invention. The plan view of the 2nd flow path member which concerns on Embodiment 1 of this invention. The plan view of the 3rd flow path member which concerns on Embodiment 1 of this invention. The bottom view of the 3rd flow path member which concerns on Embodiment 1 of this invention. BB'line cross-sectional views of FIGS. 11 to 13. Cross-sectional view taken along the line CC'of FIGS. 11 to 13. 11 to 13 are cross-sectional views taken along the line DD'. The cross-sectional view taken along the line EE'of FIGS. 11 to 13 and the cross-sectional view of the conventional head body. The schematic plan view of the head body which concerns on Embodiment 1 of this invention.

<Embodiment 1>
The present invention will be described in detail based on the embodiments. The inkjet recording head is an example of a liquid injection head, and is also simply referred to as a recording head. The inkjet recording head unit is an example of a liquid injection head unit, and is also simply referred to as a head unit. The inkjet recording device is an example of a liquid injection device. FIG. 1 is a perspective view showing a schematic configuration of an inkjet recording device according to the present embodiment.

As shown in FIG. 1, the inkjet recording device 1 is a so-called line-type recording device including a head unit 101 and performing printing by transporting a recording sheet S such as paper as an injection medium.

Specifically, the inkjet recording device 1 includes a device main body 2, a head unit 101 having a plurality of recording heads 100, a transport means 4 for transporting the recording sheet S, and a recording sheet S facing the head unit 101. A support member 7 for supporting the device 7 is provided. In this embodiment, the transport direction of the recording sheet S is the X direction. Further, in the liquid injection surface provided with the nozzle opening of the head unit 101, the direction orthogonal to the X direction is defined as the Y direction. Further, the direction orthogonal to the X direction and the Y direction is defined as the Z direction. Further, in the X direction, the upstream side for transporting the recording sheet S is the X1 side, the downstream side is the X2 side, one is the Y1 side in the Y direction, the other is the Y2 side, and the liquid injection direction side in the Z direction (recording sheet S). The side) is the Z1 side, and the opposite side is the Z2 side.

The head unit 101 includes a plurality of recording heads 100 and a head fixing substrate 102 that holds the plurality of recording heads 100.

The plurality of recording heads 100 are arranged side by side in the Y direction, which is a direction intersecting the X direction, which is the transport direction, and are fixed to the head fixing substrate 102. In this embodiment, the plurality of recording heads 100 are arranged side by side on a straight line in the Y direction. That is, the plurality of recording heads 100 are not arranged so as to be displaced in the X direction. As a result, the width of the head unit 101 in the X direction can be narrowed to reduce the size of the head unit 101.

The head fixing substrate 102 holds the plurality of recording heads 100 so that the nozzle openings of the plurality of recording heads 100 face the recording sheet S side, and is fixed to the apparatus main body 2.

The transport means 4 transports the recording sheet S to the head unit 101 in the X direction. The transport means 4 includes, for example, a first transport roller 5 provided on both sides of the recording sheet S in the X direction, which is the transport direction of the recording sheet S, and a second transport roller 6. The recording sheet S is conveyed in the X direction by the first transfer roller 5 and the second transfer roller 6. The transporting means 4 for transporting the recording sheet S is not limited to the transport roller, and may be a belt, a drum, or the like.

The support member 7 supports the recording sheet S transported by the transport means 4 at a position facing the head unit 101. The support member 7 is made of, for example, a metal or resin having a rectangular cross section, and is provided between the first transfer roller 5 and the second transfer roller 6 so as to face the head unit 101.

The support member 7 may be provided with a suction means for sucking the conveyed recording sheet S on the support member 7. Examples of the suction means include those that suck and suck the recording sheet S by sucking it, those that electrostatically suck the recording sheet S by electrostatic force, and the like. Further, for example, when the transport means 4 is a belt or a drum, the support member 7 supports the recording sheet S on the belt or the drum at a position facing the head unit 101.

Although not shown, each recording head 100 of the head unit 101 is connected to a liquid storage means such as an ink tank or an ink cartridge in which ink is stored so that ink can be supplied. The liquid storage means may be held on the head unit 101, for example, or may be held at a position different from that of the head unit 101 in the apparatus main body 2. Further, a flow path or the like for supplying the ink supplied from the liquid storage means to the recording head 100 may be provided inside the head fixing substrate 102, or an ink flow path member may be provided on the head fixing substrate 102 to provide ink. Ink from the liquid storage means may be supplied to the recording head 100 via the flow path member. Of course, ink may be directly supplied from the liquid storage means to the recording head 100 without going through the head fixing substrate 102 or the ink flow path member fixed to the head fixing substrate 102.

In such an inkjet recording device 1, the recording sheet S is conveyed in the X direction by the first conveying roller 5, and printing is executed on the recording sheet S supported on the support member 7 by the head unit 101. The printed recording sheet S is conveyed in the X direction by the second conveying roller 6.

The head unit 101 will be described in detail with reference to FIGS. 2 and 3. FIG. 2 is an exploded perspective view showing the head unit according to the present embodiment, and FIG. 3 is a bottom view of the head unit on the liquid injection surface side.

The head unit 101 of the present embodiment includes a plurality of recording heads 100 and a head fixing substrate 102 that holds the plurality of recording heads 100. The recording head 100 has a liquid injection surface 20a provided with a nozzle opening 21 on the Z1 side in the Z direction. Each recording head 100 is fixed to the surface side of the head fixing substrate 102 facing the recording sheet S, that is, the Z1 side which is the recording sheet S side in the Z direction.

As described above, the plurality of recording heads 100 are arranged side by side in a straight line in the Y direction orthogonal to the X direction, which is the transport direction, and fixed to the head fixing substrate 102. That is, the plurality of recording heads 100 are not arranged so as to be displaced in the X direction. As a result, the width of the head unit 101 in the X direction can be narrowed to reduce the size of the head unit 101. Of course, the recording heads 100 arranged side by side in the Y direction may be arranged so as to be displaced in the X direction, but if the recording heads 100 are largely displaced in the X direction, the width of the head fixing substrate 102 or the like in the X direction becomes wider. turn into. When the size of the head unit 101 in the X direction becomes large in this way, the distance between the first transport roller 5 and the second transport roller 6 in the inkjet recording device 1 in the X direction becomes long, and the posture of the recording sheet S becomes large. It becomes difficult to fix. In addition, the head unit 101 and the inkjet recording device 1 become large in size.

In the present embodiment, four recording heads 100 are fixed to the head fixing substrate 102, but the number of recording heads 100 is not particularly limited as long as it is two or more.

The recording head 100 will be described with reference to FIGS. 2 and 4 to 6. 4 is a plan view of the recording head, FIG. 5 is a bottom view of the recording head, and FIG. 6 is a sectional view taken along line AA'of FIG. Note that FIG. 4 is a plan view of the recording head 100 on the Z2 side in the Z direction, and the holding member 120 is not shown.

The recording head 100 includes a plurality of head main bodies 110, a COF substrate 98 connected to each head main body 110, and a flow path member 200 provided with a flow path for supplying ink to each head main body. Further, in the present embodiment, the recording head 100 includes a holding member 120 for holding a plurality of head main bodies 110, a fixing plate 130 provided on the liquid injection surface 20a side of the head main body 110, and a relay board 140. ..

In the head body 110, ink is supplied from the holding member 120 and the flow path member 200 provided with the ink flow path, and the relay board 140 and the COF board are supplied from a control unit (not shown) provided in the inkjet recording device 1. A control signal is transmitted via 98, and ink droplets are ejected based on the control signal. The detailed configuration of the head body 110 will be described later.

Each head body 110 has a liquid injection surface 20a provided with a nozzle opening 21 on the Z1 side in the Z direction. Further, the Z2 side of the plurality of head main bodies 110 is adhered to the Z1 side surface of the flow path member 200.

The flow path member 200 is a member provided with a liquid flow path for ink supplied to the head body 110. The detailed configuration of the flow path member 200 will be described later, but a plurality of head main bodies 110 are arranged side by side in the Y direction and adhered to the flow path member 200 on the surface on the Z1 side. Further, the liquid flow path provided in the flow path member 200 communicates with the liquid flow path of each head main body 110, and ink is supplied from the flow path member 200 to each head main body 110.

In this embodiment, six head bodies 110 are adhered to one flow path member 200. Of course, the number of head main bodies 110 fixed to one flow path member 200 is not limited to those described above, and even if there is one head main body 110 for one flow path member 200, or two or more. It may be a plurality of.

Further, the flow path member 200 is provided with an opening 201 penetrating in the Z direction, and a COF substrate 98 having one end connected to the head main body 110 is inserted through the opening 201.

The COF substrate 98 is an example of a flexible wiring board. The flexible wiring board is a board in which wiring is formed on a flexible substrate. Further, the COF substrate 98 includes a drive circuit 97 (see FIG. 7) for driving the pressure generating means provided in the head main body 110.

The relay board 140 is a board on which electrical components such as wiring, ICs, and resistors are mounted on the surface, and is arranged between the holding member 120 and the flow path member 200. The relay board 140 is formed with a penetrating portion 141 communicating with the opening 201 provided in the flow path member 200. The opening shape of each penetrating portion 141 is formed to be larger than the opening portion 201 of the flow path member 200.

The COF board 98 connected to the pressure generating means of the head body 110 is connected to a terminal (not shown) provided on the Z2 side surface of the relay board 140 through the opening 201 and the through portion 141. ..

Although not particularly shown, the relay board 140 is connected to the control unit of the inkjet recording device 1. Therefore, the drive signal or the like sent from the control unit is transmitted to the drive circuit 97 of the COF board 98 through the relay board 140, and the pressure generating means of the head body 110 is driven by the drive circuit 97. As a result, the ink ejection operation of the recording head 100 is controlled.

The holding member 120 has a holding portion 121 that forms a groove-like space on the Z1 side. The holding portion 121 is continuously provided on the Z1 side surface of the holding member 120 in the Y direction, so that the holding portion 121 is provided so as to be open on both side surfaces in the Y direction. Further, in the holding member 120, by providing the holding portion 121 at a substantially central portion in the X direction, foot portions 122 are formed on both sides of the holding portion 121 in the X direction. That is, the foot portions 122 are provided on the Z1 side surface of the holding member 120 only at both end portions in the X direction, and are not provided at both end portions in the Y direction. In the present embodiment, the holding member 120 is composed of one member, but the present invention is not limited to such an embodiment, and a plurality of members may be laminated in the Z direction.

A relay board 140, a flow path member 200, and a plurality of head main bodies 110 are housed in such a holding portion 121. Specifically, each head body 110 is joined to the Z1 side surface of the flow path member 200 with an adhesive or the like, and the relay board 140 is fixed to the Z2 side surface of the flow path member 200. The relay board 140, the flow path member 200, and the plurality of head main bodies 110 integrally configured in this way are housed in the holding portion 121.

In the holding member 120 and the flow path member 200, the surfaces of the holding portion 121 and the flow path member 200 facing each other in the Z direction are adhered to each other by an adhesive. The relay board 140 is housed in a space sandwiched between the holding portion 121 and the flow path member 200. Instead of bonding with an adhesive, the holding member 120 and the flow path member 200 may be integrated by a fixing means such as a screw.

Further, although not particularly shown, the holding member 120 is formed with a flow path through which ink flows, a filter for capturing foreign matter, and the like. The flow path of these holding members 120 communicates with the liquid flow path of the flow path member 200. As a result, the ink from the liquid storage means provided in the inkjet recording device 1 is supplied to the head main body 110 via the holding member 120 and the flow path member 200.

The fixing plate 130 is a member provided on the liquid injection surface 20a side of the recording head 100, that is, on the Z1 side of the recording head 100 in the Z direction, and holds each recording head 100. The fixing plate 130 is formed by bending a plate-shaped member such as metal. Specifically, the fixing plate 130 includes a base portion 131 provided on the liquid injection surface 20a side and a bent portion 132 provided with both ends of the base portion 131 in the Y direction bent toward the Z2 side in the Z direction. Equipped.

Further, the base portion 131 is provided with an exposed opening 133, which is an opening for exposing the nozzle opening 21 of each head body 110. In the present embodiment, the exposed opening 133 is provided so as to open independently for each head body 110. That is, since the recording head 100 of the present embodiment has six head main bodies 110, the base portion 131 is provided with six independent exposed openings 133. Of course, depending on the configuration of the head main body 110 and the like, one common exposed opening 133 may be provided for the head main body group composed of a plurality of head main bodies 110.

The Z1 side of the holding portion 121 of the holding member 120 is covered by such a base portion 131. As shown in FIG. 6, the base portion 131 is joined to the Z1 side surface of the holding member 120 in the Z direction, that is, to the Z1 side end surface of the foot portion 122 via an adhesive.

Further, the bent portions 132 are provided at both ends of the base portion 131 in the Y direction, and are formed in a size that covers the opening area of the holding portion 121 that opens on the side surface in the Y direction. That is, the bent portion 132 is a region from the end portion of the base portion 131 in the Y direction to the edge portion of the fixing plate 130. Then, such a bent portion 132 is joined to the side surface of the holding member 120 in the Y direction via an adhesive. As a result, the opening of the holding portion 121 to the side surface in the Y direction is covered and sealed by the bent portion 132.

By adhering the fixing plate 130 to the holding member 120 with an adhesive in this way, the head body 110 is arranged in the holding portion 121 which is a space between the holding member 120 and the fixing plate 130.

As described above, the recording head 100 according to the present embodiment is provided with a plurality of head main bodies 110 for one recording head 100 to increase the number of nozzle rows, so that the recording head 100 has one recording head 100. The yield can be improved as compared with the case where a plurality of nozzle rows are provided only in one head main body 110 and the number of nozzle rows is increased. That is, increasing the number of nozzle rows in the single head main body 110 lowers the yield of the head main body 110 and increases the manufacturing cost. On the other hand, by increasing the number of nozzle rows by a plurality of head main bodies 110, the yield of the head main bodies 110 can be improved and the manufacturing cost can be reduced.

Further, the opening on the side surface of the holding member 120 in the Y direction is sealed by the bent portion 132 of the fixing plate 130. As a result, the holding member 120 is provided on both sides of the holding member 120 in the Y direction (the hatch portion shown in FIG. 3) on the side surface of the holding portion 121 in the Y direction even if there are no feet for adhering to the base portion 131 of the fixing plate 130. It is possible to suppress the evaporation of water from the opened opening.

Therefore, in the head unit 101 in which the recording heads 100 are arranged side by side in the Y direction, since the foot portions 122 do not exist on the side of the recording heads 100 adjacent to each other in the Y direction, the distance between the recording heads 100 adjacent to each other in the Y direction should be narrowed. Can be done. As a result, the head bodies 110 of the recording heads 100 adjacent to each other in the Y direction can be provided close to each other, and the nozzle openings 21 provided in the head main bodies 110 of the adjacent recording heads 100 are provided close to each other in the Y direction. be able to.

The recording head 100 according to the present embodiment is provided with foot portions 122 on both sides of the holding member 120 in the X direction, but the foot portions 122 may not be provided. That is, the head main body 110 may be adhered to the Z1 side surface of the holding member 120, and the bent portions 132 may be provided on both sides of the fixing plate 130 in the X direction and the Y direction. That is, the fixing plate 130 is provided with a bent portion 132 over the entire circumference of the liquid injection surface 20a in the in-plane direction, and the fixing plate 130 is adhered over the entire circumference of the side surface of the holding member 120. May be good. However, by providing the foot portions 122 on both sides of the holding member 120 in the X direction as in the present embodiment, the end faces of the foot portion 122 on the Z1 side are adhered to the base portion 131 of the fixing plate 130, thereby performing inkjet recording. The strength of the head 100 in the Z direction can be improved, and the evaporation of water from the foot portion 122 can be suppressed.

The head main body 110 will be described with reference to FIGS. 7 and 8. FIG. 7 is a perspective view of the head body according to the present embodiment, and FIG. 8 is a cross-sectional view of the head body in the Y direction. Of course, the configuration of the head body 110 is not limited to the following configuration.

The head body 110 of the present embodiment includes a pressure generating chamber 12, a nozzle opening 21, a manifold 95, a pressure generating means, and the like. Therefore, a plurality of members such as the flow path forming substrate 10, the communication plate 15, the nozzle plate 20, the protective substrate 30, the compliance substrate 45, and the case 40 are joined by an adhesive or the like.

On the flow path forming substrate 10, pressure generating chambers 12 partitioned by a plurality of partition walls are juxtaposed along the juxtaposed direction of the plurality of nozzle openings 21 by anisotropic etching from one side. In the present embodiment, the side-by-side direction of the pressure generating chambers 12 is referred to as the Xa direction. Further, the flow path forming substrate 10 is provided with a plurality of rows in which pressure generating chambers 12 are arranged side by side in the Xa direction, and in the present embodiment, two rows are provided. The rowing direction in which a plurality of rows of the pressure generating chambers 12 are arranged is hereinafter referred to as the Ya direction. In the present embodiment, the directions orthogonal to the Xa direction and the Ya direction coincide with the Z direction. Further, the head body 110 of the present embodiment is mounted on the head unit 101 so that the Xa direction, which is the parallel direction of the nozzle openings 21, is inclined with respect to the X direction, which is the transport direction of the recording sheet S. To.

Further, the flow path forming substrate 10 is provided with a flow path resistance of ink flowing into the pressure generation chamber 12 on one end side of the pressure generation chamber 12 in the Ya direction, which has a smaller opening area than the pressure generation chamber 12. A supply channel or the like may be provided.

A communication plate 15 is joined to one side of the flow path forming substrate 10. Further, a nozzle plate 20 provided with a plurality of nozzle openings 21 communicating with each pressure generating chamber 12 is joined to the communication plate 15. In the present embodiment, the liquid injection surface 20a is on the Z1 side in the Z direction in which the nozzle opening 21 of the nozzle plate 20 opens.

The communication plate 15 is provided with a nozzle communication passage 16 that communicates the pressure generating chamber 12 and the nozzle opening 21. The communication plate 15 has a larger area than the flow path forming substrate 10, and the nozzle plate 20 has a smaller area than the flow path forming substrate 10. By making the area of the nozzle plate 20 relatively small in this way, the cost can be reduced.

Further, the communication plate 15 is provided with a first manifold 17 and a second manifold 18 that form a part of the manifold 95. The first manifold 17 is provided so as to penetrate the communication plate 15 in the Z direction. The second manifold 18 is provided halfway in the Z direction by opening to the nozzle plate 20 side of the communication plate 15 without penetrating the communication plate 15 in the Z direction.

Further, the communication plate 15 is provided with a supply communication passage 19 that communicates with one end of the pressure generation chamber 12 in the Y direction independently for each pressure generation chamber 12. The supply communication passage 19 communicates the second manifold 18 with the pressure generating chamber 12.

The nozzle plate 20 is formed with nozzle openings 21 that communicate with each pressure generating chamber 12 via the nozzle communication passage 16. A plurality of nozzle openings 21 are arranged side by side in the Xa direction, and each of the arranged nozzle openings 21 forms two nozzle rows a and nozzle rows b, and the nozzle rows a and nozzle rows b are arranged side by side in the Ya direction. ing. In this embodiment, although the details will be described later, each of the nozzle row a and the nozzle row b is divided into two so that two types of liquids can be injected in one row.

On the other hand, a diaphragm 50 is formed on the side of the flow path forming substrate 10 opposite to the communication plate 15. Further, the piezoelectric actuator 300, which is the pressure generating means of the present embodiment, is configured by sequentially stacking the first electrode 60, the piezoelectric layer 70, and the second electrode 80 on the diaphragm 50. Generally, one electrode of the piezoelectric actuator 300 is used as a common electrode, and the other electrode and the piezoelectric layer are patterned for each pressure generating chamber 12.

Further, a protective substrate 30 having substantially the same size as the flow path forming substrate 10 is bonded to the surface of the flow path forming substrate 10 on the piezoelectric actuator 300 side. The protective substrate 30 has a holding portion 31 which is a space for protecting the piezoelectric actuator 300. Further, the protective substrate 30 is provided with a through hole 32 penetrating in the Z direction. The end of the lead electrode 90 drawn from the electrode of the piezoelectric actuator 300 is extended so as to be exposed in the through hole 32, and the lead electrode 90 and the COF substrate 98 are electrically connected in the through hole 32. Has been done.

Further, a case 40 defining a manifold 95 communicating with a plurality of pressure generating chambers 12 is fixed to the protective substrate 30 and the communicating plate 15. The case 40 has substantially the same shape as the above-mentioned communication plate 15 in a plan view, and is joined to the protective substrate 30 and also to the above-mentioned communication plate 15. Specifically, the case 40 has a recess 41 having a depth for accommodating the flow path forming substrate 10 and the protective substrate 30 on the protective substrate 30 side. The recess 41 has an opening area wider than the surface of the protective substrate 30 joined to the flow path forming substrate 10. Then, the opening surface of the recess 41 on the nozzle plate 20 side is sealed by the communication plate 15 in a state where the flow path forming substrate 10 and the like are housed in the recess 41. As a result, a third manifold 42 is defined on the outer peripheral portion of the flow path forming substrate 10 by the case 40, the flow path forming substrate 10, and the protective substrate 30. The manifold 95 of the present embodiment is composed of the third manifold 42 and the first manifold 17 and the second manifold 18 provided on the communication plate 15. As described above, since two types of liquids can be injected with one row of nozzle rows, the first manifold 17, the second manifold 18, and the third manifold 42 constituting the manifold 95 are nozzle rows, respectively. It is divided into two in the direction, that is, in the Xa direction. For example, the first manifold 17 includes a first manifold 17a and a first manifold 17b, as shown in FIG. The second manifold 18 and the third manifold 42 are also divided into two in the same manner, and the entire manifold 95 is also divided into two in the Xa direction.

In the present embodiment, the first manifold 17, the second manifold 18, and the third manifold 42 constituting the manifold 95 are arranged symmetrically with the nozzle row a and the nozzle row b, respectively. According to this, it is possible to inject different liquids for each of the nozzle row a and the nozzle row b. Of course, the arrangement of the manifold is not limited to this.

Further, in the present embodiment, the manifold corresponding to each nozzle row is divided into two in the Xa direction to form a total of four manifolds 95 so that four types of liquids can be injected as described later. It may be a manifold formed for each nozzle row b, or it may be a common manifold for the two rows of the nozzle row a and the nozzle row b.

Further, a compliance board 45 is provided on the surface of the communication plate 15 where the first manifold 17 and the second manifold 18 open. The compliance board 45 seals the openings of the first manifold 17 and the second manifold 18.

In this embodiment, such a compliance substrate 45 includes a sealing film 46 and a fixed substrate 47. The sealing film 46 is formed of a flexible thin film (for example, polyphenylene sulfide (PPS), stainless steel (SUS), etc.). Further, the fixed substrate 47 is formed of a hard material such as a metal such as stainless steel (SUS). Since the region of the fixed substrate 47 facing the manifold 95 is an opening 48 completely removed in the thickness direction, one surface of the manifold 95 is sealed only with the flexible sealing film 46. It is a compliance unit 49, which is a flexible portion.

Further, the fixing plate 130 is adhered to the side of the compliance substrate 45 opposite to the communication plate 15. That is, the exposed opening 133 provided in the base 131 of the fixing plate 130 has an opening area wider than the area of the nozzle plate 20, and exposes the liquid injection surface 20a of the nozzle plate 20 in the exposed opening 133. .. Of course, the fixing plate 130 is not limited to this, for example, the exposed opening 133 of the fixing plate 130 has an opening area smaller than the outer shape of the nozzle plate 20, and the fixing plate 130 hits the liquid injection surface 20a of the nozzle plate 20. It may be brought into contact or adhered. Further, even when the exposed opening 133 of the fixing plate 130 has an opening area smaller than the outer shape of the nozzle plate 20, the fixing plate 130 and the liquid injection surface 20a may be provided so as not to come into contact with each other. That is, the fact that the fixing plate 130 is provided on the liquid injection surface 20a side includes those that are not in contact with the liquid injection surface 20a and those that are in contact with the liquid injection surface 20a.

The case 40 is provided with an introduction path 44 for communicating with the manifold 95 and supplying ink to each manifold 95. Further, the case 40 is provided with a connection port 43 through which the COF substrate 98 is inserted so as to communicate with the through hole 32 of the protective substrate 30.

In the head body 110 having such a configuration, when the ink is ejected, the ink is taken in from the storage means via the introduction path 44, and the inside of the flow path is filled with the ink from the manifold 95 to the nozzle opening 21. After that, according to the signal from the drive circuit 97, a voltage is applied to each piezoelectric actuator 300 corresponding to the pressure generating chamber 12, so that the diaphragm is flexed and deformed together with the piezoelectric actuator 300. As a result, the pressure in the pressure generating chamber 12 increases, and ink droplets are ejected from the predetermined nozzle opening 21.

Here, using FIGS. 5 and 9, the parallel arrangement direction of the nozzle openings 21 constituting the nozzle row of the head main body 110 is provided so as to be inclined with respect to the X direction which is the transport direction of the recording sheet S. The points will be described in detail. FIG. 9 is an explanatory view schematically showing the arrangement of the nozzle openings of the head body according to the present embodiment.

The plurality of head main bodies 110 are fixed so that the nozzle row a and the nozzle row b are inclined with respect to the X direction, which is the transport direction of the recording sheet S, in the in-plane direction of the liquid injection surface 20a. The nozzle row referred to here refers to a plurality of nozzle openings 21 arranged side by side in a predetermined direction. In the present embodiment, the liquid injection surface 20a is provided with two rows of nozzle rows a and nozzle rows b in which a plurality of nozzle openings 21 are arranged side by side in the Xa direction as a predetermined direction on the liquid injection surface 20a. The Xa direction is a direction that intersects the X direction at an angle greater than 0 degrees and less than 90 degrees. Here, it is preferable that the X direction and the Xa direction intersect at an angle larger than 0 degrees and less than 45 degrees. According to this, the distance D1 between the nozzle openings 21 in the Y direction can be made smaller than the case where the nozzle openings 21 intersect at an angle larger than 45 degrees and less than 90 degrees, and a high-resolution recording head 100 can be realized in the Y direction. it can. Of course, the X direction and the Xa direction may intersect at an angle larger than 45 degrees and less than 90 degrees.

When the X direction and the Xa direction intersect at an angle greater than 0 degrees and less than 45 degrees, the nozzle row faces the X direction rather than a straight line intersecting the X direction at 45 degrees in the plane of the liquid injection surface 20a. The state of being more inclined. Further, the interval D1 referred to here is an interval between the nozzle openings 21 when the nozzle openings 21 of the nozzle row a and the nozzle row b are projected in the X direction with respect to the virtual line in the Y direction. Further, the distance between the nozzle openings 21 when the nozzle openings 21 of the nozzle row a and the nozzle row b are projected in the Y direction with respect to the virtual line in the X direction is set to D2.

Further, as shown in FIG. 9, in the present embodiment, one nozzle row can inject two types of liquids, and two nozzle rows can inject four types of liquids. That is, assuming that four colors of ink are used, for example, black Bk and magenta M can be ejected in the nozzle row a, and cyan C and yellow Y can be jetted in the nozzle row b. Further, the nozzle row a and the nozzle row b have the same number of nozzle openings 21, and the position of the nozzle opening 21 of the nozzle row a in the Y direction and the position of the nozzle opening 21 of the nozzle row b in the Y direction are different. It overlaps in the X direction.

The head bodies 110a to 110c have similar nozzle rows a and b, and the head bodies 110a to 110c are provided close to each other in the Y direction, so that each nozzle opening 21 of the head body 110 adjacent to the head body 110 is provided. Are juxtaposed so as to overlap each other in the X direction. Therefore, for example, the magenta M nozzle row a of the head body 110a and the yellow Y nozzle row b overlap the black Bk nozzle row a of the head body 110b and the cyan C nozzle row b in the X direction. Four colors are lined up in a row in the direction, and a color image can be printed. Similarly, with respect to the head main body 110b and the head main body 110c adjacent to each other in the Y direction, the nozzle openings 21 are arranged side by side so as to overlap each other in the X direction.

Further, by arranging at least a part of the nozzle openings 21 of the same color of the adjacent head main bodies 110 so as to overlap each other in the X direction, the image quality of the joint between the head main bodies 110 is improved. Can be done. That is, for example, one nozzle opening 21 of the magenta M nozzle row a of the head body 110a and one nozzle opening 21 of the magenta M nozzle row a of the head body 110b are arranged so as to overlap each other in the X direction. By controlling the injection from the two nozzle openings 21 that overlap each other, it is possible to prevent deterioration of image quality such as banding and streaks at the joint between the adjacent head main bodies 110. Further, in the example shown in FIG. 9, only one nozzle opening 21 overlaps in the X direction, but two or more nozzle openings 21 may overlap in the X direction.

Of course, such a color arrangement is not limited to this. For example, although not particularly shown, one nozzle row may be arranged so that four colors of black Bk, magenta M, cyan C, and yellow Y can be injected.

As described above, four recording heads 100 having a plurality of head main bodies 110 are fixed to the head fixing substrate 102 to form the head unit 101, but as shown by the straight line L in FIG. 5, adjacent recording heads 100 are formed. A part of the nozzle rows is arranged so as to overlap each other in the X direction. That is, similar to the relationship between the adjacent head main bodies 110 in one recording head 100, the adjacent head main bodies 110 are provided close to each other in the Y direction between the adjacent recording heads 100 in the Y direction, so that the adjacent recording heads are adjacent to each other. A color image can be printed between the 100 recording heads, and the image quality of the joint between the adjacent recording heads 100 can be improved. Of course, the number of nozzle openings 21 overlapping in the X direction between adjacent recording heads 100 does not have to be the same as the number of nozzle openings 21 overlapping in the X direction between the head bodies 110 in one recording head 100.

In this way, the image quality of the joint can be improved by partially overlapping the nozzle rows between the head bodies 110 and the nozzle rows between the recording heads 100 in the X direction.

Further, the nozzle pitch and the angle between the X direction and the Xa direction are set so that the interval D1 in the X direction and the interval D2 in the Y direction are integer ratios between the nozzle openings 21 adjacent to each other in the Xa direction of each nozzle row. Is preferable. According to this, when printing image data composed of pixels arranged in a matrix in the X direction and the Y direction, it becomes easy to associate each nozzle with the pixel. Of course, the ratio is not limited to such an integer ratio.

As shown in FIG. 5, the recording head 100 of the present embodiment has a shape of a substantially parallelogram when viewed in a plan view from the liquid injection surface 20a side. This is because, as described above, the Xa direction, which is the parallel direction of the nozzle rows a and the nozzle openings 21 forming the nozzle row b of each head body 110, is inclined with respect to the X direction, which is the transport direction of the recording sheet S. The outer shape of the recording head 100, that is, the fixing plate 130 is formed to be a substantially parallel quadrilateral in the same direction as the Xa direction, which is the direction in which the nozzle row a and the nozzle row b are inclined. Is. Of course, the shape of the recording head 100 when viewed in a plan view from the liquid injection surface 20a side is not limited to a substantially parallelogram, and may be a trapezoidal rectangle, a polygon, or the like.

In the embodiment described above, an example in which two rows of nozzle rows are provided in one head body has been described, but even if the head body has three or more rows of nozzles, the above-mentioned effect can be similarly obtained. Needless to say. If there are two rows of nozzles provided in one head body 110 as in the present embodiment, as shown in FIG. 7, between the two manifolds 95 corresponding to the respective nozzle rows, each Since the nozzle openings 21 of the nozzle row can be arranged, two rows of nozzle rows are compared with the case where the nozzle openings 21 of a plurality of nozzle rows are arranged on the same side with respect to the manifold corresponding to each nozzle row. The interval in the Ya direction can be narrowed. Therefore, the area required for one nozzle plate 20 can be reduced for two rows of nozzle rows. In addition, the connection between the piezoelectric actuators 300 in each of the two nozzle rows and the COF substrate 98 becomes easy.

Further, in the present embodiment, each of the nozzle rows a and b has the same number of nozzle openings 21. According to this, the number of overlaps in the X direction between the nozzle rows can be made the same, and efficient liquid injection can be performed. However, the number of nozzle openings in each nozzle row does not necessarily have to be the same. Further, the types of liquids ejected by the nozzle rows a and b may all be the same, and for example, inks of the same color may be used.

Further, in the present embodiment, it is preferable that the head main body 110 has one nozzle plate 20 for two rows of nozzle rows. According to this, the arrangement of each nozzle row can be realized with higher accuracy. Of course, a separate nozzle plate 20 may be provided for each nozzle row. The nozzle plate 20 is made of a stainless steel (SUS) plate, a silicon substrate, or the like.

The flow path member 200 according to the present embodiment will be described in detail with reference to FIGS. 10 to 16. 10 is a plan view of the first flow path member as the flow path member 200, FIG. 11 is a plan view of the second flow path member as the flow path member 200, and FIG. 12 is a plan view of the second flow path member 200. 3 is a plan view of the flow path member, FIG. 13 is a bottom view of the third flow path member, FIG. 14 is a sectional view taken along line BB'of FIGS. 10 to 13, and FIG. 15 is a view of FIGS. 10 to 10. 13 is a cross-sectional view taken along the line CC', and FIG. 16 is a cross-sectional view taken along the line DD' of FIGS. 10 to 15. 10 to 12 are plan views on the Z2 side, and FIG. 13 is a bottom view on the Z1 side.

The flow path member 200 is a member provided with a flow path 240 through which ink flows. In the present embodiment, three first flow path members 210, second flow path members 220, third flow path members 230, and a plurality of flow paths 240 are provided, which are laminated in the Z direction. In the Z direction, the first flow path member 210, the second flow path member 220, and the third flow path member 230 are laminated in this order from the holding member 120 side (see FIG. 2) toward the head body 110 side. Although not particularly shown, the first flow path member 210, the second flow path member 220, and the third flow path member 230 are adhesively fixed by an adhesive, but the present invention is not limited to this mode, and for example, a screw or the like is fixed. The first flow path member 210, the second flow path member 220, and the third flow path member 230 may be integrated by means. Further, although the material is not particularly limited, it can be formed of a metal or resin such as SUS.

The flow path 240 has an introduction flow path 280 into which ink supplied from an upstream member (holding member 120 in the present embodiment) is introduced, and a connecting portion 290 as an outlet for supplying the ink to the head. It is a flow path. In the present embodiment, four flow paths 240 are formed, and ink is supplied to one introduction flow path 280 in each flow path 240, and the ink is branched in the middle and ink is discharged from the plurality of connection portions 290 to the head main body 110. It is configured to supply to.

Of the four flow paths 240, a part is a first flow path 241 and the rest is a second flow path 242. In this embodiment, two first flow paths 241 and two second flow paths 242 are formed. Each of the two first flow paths 241 is referred to as a first flow path 241a and a first flow path 241b. Hereinafter, when the term "first flow path 241" is used, it means that both the first flow path 241a and the first flow path 241b are referred to. The same applies to the second flow path 242.

The first flow path 241 includes a first introduction flow path 281. The first introduction flow path 281 includes a first cross flow path 251 described later and a flow path upstream of the flow path member 200 (a flow path included in the holding member 120 in the present embodiment) among the first flow paths 241. It is a flow path for connecting. In the present embodiment, the two first flow paths 241a and the first flow path 241b have a first introduction flow path 281a and a first introduction flow path 281b, respectively.

Specifically, the first introduction flow path 281a includes a through hole 211 that opens at the top surface of the protrusion 212 provided on the surface of the first flow path member 210 on the Z2 side and penetrates in the Z direction, and a second. The through hole 221 penetrating in the Z direction of the flow path member 220 communicates with the through hole 221. The same applies to the first introduction flow path 281b. Hereinafter, when the term "first introduction flow path 281" is used, it means the first introduction flow path 281a and the first introduction flow path 281b.

The second flow path 242 includes a second introduction flow path 282. The second introduction flow path 282 includes a second cross flow path 252, which will be described later, and a flow path upstream of the flow path member 200 (a flow path included in the holding member 120 in this embodiment) among the second flow paths 242. It is a flow path for connecting. In the present embodiment, the two second flow paths 242a and the second flow path 242b have a second introduction flow path 282a and a second introduction flow path 282b, respectively.

Specifically, the second introduction flow path 282a is a through hole that opens at the top surface of the protrusion 213 provided on the surface of the first flow path member 210 on the Z2 side and penetrates in the Z direction. The same applies to the second introduction flow path 282b. Hereinafter, when the term "second introduction flow path 282" is used, it means the second introduction flow path 282a and the second introduction flow path 282b.

Further, when the term "introduction channel 280" is used, it means all of the above-mentioned four introduction channels.

In the present embodiment, in the plan view shown in FIG. 10, the first introduction flow path 281a is arranged near the upper left corner of the first flow path member 210, and the first introduction flow path 281a is located near the lower right corner of the first flow path member 210. The introduction flow path 281b is arranged. Further, in the plan view shown in FIG. 10, the second introduction flow path 282a is arranged near the upper right corner of the first flow path member 210, and the second introduction flow path is located near the lower left corner of the first flow path member 210. 282b is arranged.

The first flow path 241 includes a first cross flow path 251 formed by a second flow path member 220 and a third flow path member 230. The first crossing flow path 251 is a part of the first flow path 241 that allows ink to flow in a direction parallel to the liquid injection surface 20a. In the present embodiment, since the two first flow paths 241 are formed, two first cross flow paths 251 are also formed. Each of the two first crossing flow paths 251 is referred to as a first crossing flow path 251a and a first crossing flow path 251b.

The first crossing flow path 251a has a crossing groove portion 226a formed on the surface of the second flow path member 220 on the Z1 side along the Y direction and a surface of the third flow path member 230 on the Z2 side along the Y direction. It is formed by sealing together with the formed cross groove portion 231a. The first crossing flow path 251b has a crossing groove portion 226b formed on the surface of the second flow path member 220 on the Z1 side along the Y direction and a surface of the third flow path member 230 on the Z2 side along the Y direction. It is formed by combining and sealing the formed cross groove portion 231b.

For any of the first cross-section flow paths 251a and 251b, by forming the cross-section grooves 226a, 226b, 231a and 231b in the second flow path member 220 and the third flow path member 230, respectively, the first cross-section flow path 251a, The cross section of each of the 251b is widened to reduce the pressure loss in the first crossing flow paths 251a and 251b. The first crossing flow paths 251a and 251b may be formed by the crossing groove portions 226a and 226b formed only in the second flow path member 220, or may be formed only in the third flow path member 230. It may be formed by the cross groove portions 231a and 231b. For example, by forming the intersecting groove portions 226a and 226b only in the second flow path member 220 on the Z2 side, the width in the Xa direction becomes narrower from the Z1 side to the Z2 side as described later, and the COF substrate 98. It is possible to improve the degree of freedom in arranging the first flow path 241 while preventing interference with these first cross flow paths 251a and 251b.

The first crossing flow path 251a and the first crossing flow path 251b are arranged on both outer sides of the opening 201 (third opening 235) through which the COF substrate 98 is inserted in the X direction.

The second flow path 242 includes a second cross flow path 252 formed by the first flow path member 210 and the second flow path member 220. The second crossing flow path 252 is a part of the second flow path 242 that allows ink to flow in a direction parallel to the liquid injection surface 20a. In the present embodiment, since the two second flow paths 242 are formed, two second cross flow paths 252 are also formed. Each of the two second crossing flow paths 252 is referred to as a second crossing flow path 252a and a second crossing flow path 252b.

The second crossing flow path 252a includes a crossing groove portion 213a formed on the surface of the first flow path member 210 on the Z1 side along the Y direction and the surface of the second flow path member 220 on the Z2 side along the Y direction. It is formed by sealing the formed intersecting groove portion 222a together. The second crossing flow path 252b includes a crossing groove portion 213b formed on the surface of the first flow path member 210 on the Z1 side and a crossing groove portion formed along the Y direction on the surface of the second flow path member 220 on the Z2 side. It is formed by sealing together with 222b.

For any of the second cross-section flow paths 252a and 252b, by forming the cross-section grooves 213a, 213b, 222a and 222b in the first flow path member 210 and the second flow path member 220, respectively, the second cross-section flow path 252a, The cross section of each of the 252b is widened to reduce the pressure loss in the second crossing flow paths 252a and 252b. The second crossing flow paths 252a and 252b may be formed only by the crossing groove portions 213a and 213b formed only in the first flow path member 210, or may be formed only in the second flow path member 220. It may be formed by the cross groove portions 222a and 222b. For example, by forming the intersecting groove portions 222a and 222b only in the first flow path member 210 on the Z2 side, the first crossing flow path 251a and 251b described above can be prevented from interfering with the COF substrate 98. The degree of freedom in arranging the two flow paths 242 can be improved.

The second crossing flow path 252a and the second crossing flow path 252b are arranged on both outer sides of the opening 201 (second opening 225) through which the COF substrate 98 is inserted in the X direction.

Hereinafter, when the term "first crossing flow path 251" is used, it is assumed that both the first crossing flow path 251a and the first crossing flow path 251b are referred to. When the term "second crossing flow path 252" is used, it means both the second crossing flow path 252a and the second crossing flow path 252b. Further, when the term "intersection flow path 250" is used, it means all of the above-mentioned four intersection flow paths.

Further, in the present embodiment, the first flow path 241 is configured to branch from one introduction flow path 280 to a plurality of connection portions 290. That is, from the first crossing flow path 251, a plurality of first branch flow paths 261 are on the same plane as the first crossing flow path 251 (the boundary surface where the second flow path member 220 and the third flow path member 230 are joined). Branches at.

In the present embodiment, in the plane parallel to the liquid injection surface 20a (the boundary surface between the second flow path member 220 and the third flow path member 230), the first cross flow path 251 to the six first branch flow paths 261 Is branched. Each of the six first branch flow paths 261 branched from the first cross flow path 251a is referred to as a first branch flow path 261a1 to a first branch flow path 261a6. Hereinafter, when the term "first branch flow path 261a" is used, it is assumed that all six branch flow paths connected to the first branch flow path 261a are referred to.

Similarly, each of the six first branch flow paths 261 branched from the first cross flow path 251b is referred to as a first branch flow path 261b1 to a first branch flow path 261b6. Hereinafter, when the term "first branch flow path 261b" is used, it means all of the six branch flow paths connected to the first branch flow path 261b. Further, when the term "first branch flow path 261" is used, it means all 12 branch flow paths connected to the first branch flow path 261a and the first branch flow path 261b.

In the figure, of the six first branch flow paths 261a1 to 261a6 arranged in the Y direction, the reference numerals of the first branch flow paths 261a2 to the first branch flow path 261a5 are omitted. , It is assumed that they are arranged in order from the Y1 side to the Y2 side. The same applies to the first branch flow path 261b1 to the first branch flow path 261b6.

Specifically, on the surface of the third flow path member 230 on the Z2 side, a plurality of branch groove portions 232a communicating with the cross groove portion 231a and extending toward the opening 201 side are provided. On the surface of the second flow path member 220 on the Z1 side, a plurality of branch groove portions 227a communicating with the cross groove portion 226a and extending toward the opening 201 side are provided. The first branch flow path 261a is formed by sealing the branch groove portions 227a with the branch groove portions 232a facing each other.

On the surface of the third flow path member 230 on the Z2 side, a plurality of branch groove portions 232b communicating with the cross groove portion 231b and extending toward the opening 201 side are provided. On the surface of the second flow path member 220 on the Z1 side, a plurality of branch groove portions 227b communicating with the cross groove portion 226b and extending toward the opening 201 side are provided. The first branch flow path 261b is formed by sealing the branch groove portions 227b with the branch groove portions 232b facing each other.

For any of the first branch flow paths 261a and 261b, by forming branch groove portions 227a, 227b, 232a and 232b in the second flow path member 220 and the third flow path member 230, respectively, the first branch flow path 261a, The cross section of each of the 261b is widened to reduce the pressure loss in the first branch flow paths 261a and 261b. The first branch flow paths 261a and 261b may be formed by the branch groove portions 227a and 227b formed only in the second flow path member 220, or may be formed only in the third flow path member 230. It may be formed by the intersecting groove portions 232a and 232b. For example, as will be described later, in the region Q where the width in the Ya direction expands from the Z1 side to the Z2 side by inclining in the Ya direction, the branch groove portions 227a and 227b are provided only in the second flow path member 220 on the Z2 side. By forming it, it is possible to improve the degree of freedom in arranging the first flow path 241 while preventing interference with the COF substrate 98. Further, in the region P where the width in the Ya direction widens from the Z2 side to the Z1 side, the branch groove portions 232a and 232b are formed only in the third flow path member 230 on the Z1 side to prevent interference with the COF substrate 98. While preventing it, the degree of freedom in arranging the first flow path 241 can be improved.

Further, the second flow path 242 is configured to branch from one introduction flow path 280 to a plurality of connection portions 290. Although the details will be described later, from the second crossing flow path 252, a plurality of second branch flow paths 262 are joined in the same plane as the second crossing flow path 252 (the first flow path member 210 and the second flow path member 220 are joined. It branches at the boundary surface).

In the present embodiment, in the plane parallel to the liquid injection surface 20a (the boundary surface between the first flow path member 210 and the second flow path member 220), the second cross flow path 252 to the six second branch flow paths 262. Is branched. Each of the six second branch flow paths 262 branched from the second cross flow path 252a is referred to as a second branch flow path 262a1 to a second branch flow path 262a6.

Similarly, each of the six second branch flow paths 262 branched from the second cross flow path 252b is referred to as a second branch flow path 262b1 to a second branch flow path 262b6.

Hereinafter, when the term "second branch flow path 262a" is used, it means all six branch flow paths connected to the second branch flow path 262a. When the term "second branch flow path 262b" is used, it means all six branch flow paths connected to the second branch flow path 262b. Further, when the term "second branch flow path 262" is used, it means all 12 branch flow paths connected to the second branch flow path 262a and the second branch flow path 262b. Further, when the term "branch flow path 260" is used, it means all of the above-mentioned 24 branch flow paths.

In the figure, of the six second branch flow paths 262a1 to 262a6 arranged in the Y direction, the reference numerals of the second branch flow paths 262a2 to the second branch flow paths 262a5 are omitted. , It is assumed that they are arranged in order from the Y1 side to the Y2 side. The same applies to the second branch flow path 262b1 to the second branch flow path 262b6.

Specifically, on the surface of the second flow path member 220 on the Z2 side, a plurality of branch groove portions 223a communicating with the cross groove portion 222a and extending toward the opening 201 side are provided. On the surface of the first flow path member 210 on the Z1 side, a plurality of branch groove portions 214a communicating with the cross groove portion 213a and extending toward the side opposite to the opening 201 side are provided. The second branch flow path 262a is formed by sealing the branch groove portions 214a in the branch groove portions 223a so as to face each other.

On the surface of the second flow path member 220 on the Z2 side, a plurality of branch groove portions 223b communicating with the cross groove portion 222b and extending toward the opening 201 side are provided. On the surface of the first flow path member 210 on the Z1 side, a plurality of branch groove portions 214b communicating with the cross groove portion 213b and extending toward the opening 201 side are provided. The second branch flow path 262b is formed by sealing the branch groove portions 214b in the branch groove portions 223b so as to face each other.

For any of the second branch flow paths 262a and 262b, by forming branch groove portions 214a, 214b, 223a and 223b in the first flow path member 210 and the second flow path member 220, respectively, the second branch flow path 262a, The cross section of each of the 262b is widened to reduce the pressure loss in the second branch flow paths 262a and 262b. The second branch flow paths 262a and 262b may be formed by the branch groove portions 214a and 214b formed only in the first flow path member 210, or may be formed only in the second flow path member 220. It may be formed by the branch groove portions 223a and 223b. For example, as will be described later, in the region Q in which the width in the Ya direction expands from the Z1 side to the Z2 side by inclining in the Ya direction, the branch groove portions 214a and 214b are provided only in the first flow path member 210 on the Z2 side. By forming it, it is possible to improve the degree of freedom in arranging the second flow path 242 while preventing interference with the COF substrate 98. Further, in the region P where the width in the Ya direction widens from the Z2 side to the Z1 side, the branch groove portions 223a and 223b are formed only on the second flow path member 220 on the Z1 side to prevent interference with the COF substrate 98. While preventing it, the degree of freedom in arranging the second flow path 242 can be improved.

A first vertical flow path 271 is connected to the first branch flow path 261 at an end opposite to the first cross flow path 251. Specifically, the first vertical flow path 271 is formed as a through hole penetrating the third flow path member 230 in the Z direction.

In the present embodiment, one for each of the first branch flow paths 261a1 to 261a6 and the first branch flow paths 261b1 to 261b6, that is, 12 first vertical flow paths 271a1 to 271a6 and the first vertical flow as a whole. Roads 271b1 to 271b6 are connected.

Similarly, a second vertical flow path 272 is connected to the second branch flow path 262 at an end opposite to the second cross flow path 252. Specifically, the second flow path member 220 is provided with a through hole 224 penetrating in the Z direction, and the third flow path member 230 is provided with a through hole 233 penetrating in the Z direction. These through holes 224 and through holes 233 communicate with each other to form a second vertical flow path 272.

In the present embodiment, one for each of the second branch flow paths 262a1 to 262a6 and the second branch flow paths 262b1 to 262b6, that is, 12 second vertical flow paths 272a1 to 272a6 and the second vertical flow as a whole. Roads 272b1 to 272b6 are connected.

Hereinafter, when the first vertical flow path 271a is described, it refers to the first vertical flow path 271a1 to 271a6, and when it is described as the first vertical flow path 271b, it refers to the first vertical flow path 271b1 to 271b6. When the term "first vertical flow path 271" is used, it means all of the first vertical flow path 271a and the first vertical flow path 271b.

Similarly, the description of the second vertical flow path 272a refers to the second vertical flow path 272a1 to 272a6, and the description of the second vertical flow path 272b refers to the second vertical flow path 272b1 to 272b6. , The second vertical flow path 272 refers to all of the second vertical flow path 272a and the second vertical flow path 272b.

Further, when the term "vertical flow path 270" is used, it means all of the above-mentioned 24 vertical flow paths.

In the figure, of the six first vertical flow paths 271a1 to 271a6 arranged in the Y direction, the reference numerals of the first vertical flow path 271a2 to the first vertical flow path 271a5 are omitted. , It is assumed that they are arranged in order from the Y1 side to the Y2 side. The same applies to the first vertical flow path 271b1 to the first vertical flow path 271b6, the second vertical flow path 272a1 to the second vertical flow path 272b6, and the second vertical flow path 272b1 to the second vertical flow path 272b6.

The vertical flow path 270 described above has a connection portion 290 which is an opening on the Z1 side of the third flow path member 230. Although details will be described later, the connection portion 290 communicates with the introduction path 44 provided in the head main body 110.

In the present embodiment, the first vertical flow paths 271a1 to 271a6 and the first vertical flow paths 271b1 to 271b6 are the first connection portions 291a1 to 291a6 and the first connection portions 291b1 which are openings on the Z1 side of the third flow path member 230. It has ~ 291b6 respectively. Similarly, the second vertical flow paths 272a1 to 272a6 and the second vertical flow paths 272b1 to 272b6 are the second connection portions 292a1 to 292a6 and the second connection portions 292b1 to 292b6, which are openings on the Z1 side of the third flow path member 230. Each has.

The first connection portion 291a1, the first connection portion 291b1, the second connection portion 292a1, and the second connection portion 292b1 are connected to one of the six head main bodies 110. The same applies to the first connection portion 291a2-291a6, the first connection portion 291b2-291b6, the second connection portion 292a2-292a6, and the second connection portion 292b2-292b6. That is, the first flow path 241a, the first flow path 241b, the second flow path 242a, and the second flow path 242b are connected to one head main body 110.

Hereinafter, when the description is described as the first connection portion 291a, it refers to the first connection portions 291a1 to 291a6, and when the description is described as the first connection portion 291b, it refers to the first connection portions 291b1 to 291b6. When described as 291, it shall refer to all of the first connection portion 291a and the first connection portion 291b.

Similarly, when described as the second connection portion 292a, it refers to the second connection portions 292a1 to 292a6, and when it is described as the second connection portion 292b, it refers to the second connection portions 292b1 to 292b6, and the second connection. When the term "part 292" is used, it means all of the second connection part 292a and the second connection part 292b.

Further, when the term "connecting portion 290" is used, it means all of the above-mentioned 24 connecting portions.

As described above, the flow path member 200 according to the present embodiment includes four flow paths 240, that is, a first flow path 241a and a first flow path 241b, and a second flow path 242a and a second flow path 242b. ing. Each of the flow paths 240 is configured as a single flow path from the introduction flow path 280 to the cross flow path 250, which is the inlet of the ink, and branches from the cross flow path 250 to the branch flow path 260, and the vertical flow path 270. And, it is connected to a plurality of head main bodies 110 via the connection portion 290.

In this embodiment, four color inks of black Bk, magenta M, cyan C, and yellow Y are used. Cyan C is supplied to the first flow path 241a, yellow Y is supplied to the first flow path 241b, black Bk is supplied to the second flow path 242a, and magenta M is supplied to the second flow path 242b from a liquid storage means (not shown). Then, the ink of each color circulates in the first flow path 241a, the first flow path 241b, the second flow path 242a, and the second flow path 242b, and is supplied to each head main body 110.

Further, the flow path member 200 is provided with an opening 201 through which the COF substrate 98 provided in the head main body 110 is inserted. In the present embodiment, the first flow path member 210 is formed with a first opening 215 that is inclined and penetrates in the Z direction. The second flow path member 220 is formed with a second opening 225 that is inclined and penetrates in the Z direction. The third flow path member 230 is formed with a third opening 235 that is inclined and penetrates in the Z direction.

The first opening 215, the second opening 225, and the third opening 235 communicate with each other to form one opening 201. The opening 201 has a long opening shape in the Xa direction, and six openings 201 are arranged side by side in the Y direction.

Here, as shown in FIG. 16, the COF substrate 98 according to the present embodiment has a lower end portion 98c which is one end portion close to the head main body 110 in the Z direction and the other end portion far from the head main body 110 in the Z direction. It has an upper end portion 98d which is. The width of the upper end portion 98d in the Xa direction is formed to be narrower than the width of the lower end portion 98c in the Xa direction. That is, the other end of the flexible wiring board 98 is formed so as to be narrower than one end in the plane direction.

In the present embodiment, the portion of the COF substrate 98 inserted through the first opening 215 and the third opening 235 has a rectangular shape having a constant width in the Xa direction, and the portion inserted through the second opening 225 is Z1. It is formed in a trapezoidal shape formed so that the width in the Xa direction becomes narrower from the side toward the Z2 side.

On the other hand, the opening 201 of the flow path member 200 is from the first opening 236 (that is, the opening on the Z1 side of the third opening 235) and the head body 110 that are close to the head body 110 in the Z direction perpendicular to the liquid injection surface 20a. It has a distant second opening 216 (ie, the opening on the Z2 side of the first opening 215).

The second opening 216 is formed narrower in the Xa direction than the first opening 236. That is, the width of the opening 201 in the Xa direction becomes narrower from Z1 to Z2 in the Z direction. Specifically, the opening 201 has a shape for accommodating the COF substrate 98, and the width of the opening 201 in the Xa direction is formed to be slightly wider than the width of the COF substrate 98 in the Xa direction.

The inclination of the COF substrate 98 inserted through the opening 201 of the flow path member 200 will be described with reference to FIG. 17 (a) is a cross-sectional view taken along the line EE'of FIGS. 10 to 13, and is a schematic side view of one of the recording heads according to the present embodiment as viewed from the Xa2 side to the Xa1 side in the Xa direction. Is. Further, FIG. 17B is a schematic side view of the head body according to the comparative example as viewed from the Xa2 side to the Xa1 side in the Xa direction.

As shown in FIG. 17A, the flow path member 200 is provided with one opening 201 in which the first opening 215, the second opening 225, and the third opening 235 communicate with each other. Here, the surface of the COF substrate 98 passing through the first opening 236 on the head body 110 side and the second opening 216 on the side opposite to the head body 110 of the opening 201 of the flow path member 200 is a plane B (however, however). (A) is shown as a straight line in FIG. 17 (a), and a plane that intersects the plane B at the first opening 236, is parallel to the Xa direction, and is perpendicular to the liquid injection surface 20a is the plane A (however, FIG. 17). Is shown as a straight line), the plane B, which is the surface of the COF substrate 98, intersects the plane A perpendicular to the liquid injection surface 20a.

Specifically, the second opening 216 and the first opening 236 are provided at different positions in the Ya direction. In the present embodiment, each of the second openings 216 of the six openings 201 is arranged on the Ya2 side in the Ya direction with a predetermined distance from each of the corresponding first openings 236. That is, the opening 201 is inclined so that the second opening 216 side of the plane B is away from the plane A from the Ya1 side in the Ya direction toward the Ya2 side.

The COF substrate 98 extends from the connection port 43 (see FIG. 8) provided on the head body 110 side toward the flow path member 200, and the head body 110 and the relay board 140 (see FIG. 2) are connected to each other. The flow path member 200 in between is inclined toward one side of the COF substrate 98. Here, of both surfaces of the COF substrate 98, one surface thereof is referred to as a first surface 98a and the other surface is referred to as a second surface 98b. In this case, the first surface 98a of the COF substrate 98 is the side that does not face the plane A, that is, the surface on the Ya2 side in the Ya direction. The second surface 98b of the COF substrate 98 is a surface facing the plane A, that is, a surface on the Ya1 side in the Ya direction.

Further, "the COF substrate 98 is inclined toward the first surface 98a in the flow path member 200 between the head main body 110 and the relay board 140" means that the flow path member 200 from the head main body 110 of the COF substrate 98. It means that the portion up to the second opening 216, which corresponds to the exit of the opening 201, is inclined toward the first surface 98a. Therefore, the portion protruding from the second opening 216 and connected to the surface of the relay board 140 may be inclined in any direction.

The width of the opening 201 in the Ya direction is such that the distance from the portion of the inclined COF substrate 98 closest to the opening 201 is substantially constant between the Ya1 side and the Ya2 side. Specifically, the first opening 215, the first opening 215, each of the first flow path member 210, the second flow path member 220, and the third flow path member 230 so as to keep a substantially constant distance from the inclined COF substrate 98. The widths of the two openings 225 and the third opening 235 in the Ya direction are determined. In order to facilitate the processing of the flow path member 200, the first opening 215, the second opening 225, and the third opening 235 are openings penetrating along the Z direction, and are viewed from the Xa direction. The shape of the opening 201 is a staircase shape as shown in FIG. Of course, the opening 201 may also be tilted along the tilt of the COF substrate 98. The COF substrate 98 inserted through the opening 201 is inclined toward the first surface 98a side (that is, the Ya2 side) with respect to the plane A by being inserted through such an opening 201.

As shown in FIG. 8, an introduction path 44 is formed around the connection port 43 on the surface of the head body 110 on the Z2 side, and is provided on the Ya1 side with respect to the connection port 43 of the COF substrate 98. The introduction path 44 provided and the introduction path 44 provided on the Ya2 side are arranged so that the distance between the introduction path 44 and the connection port 43 in the Ya direction is substantially the same. On the other hand, the COF substrate 98 is arranged so that the connection portion thereof is substantially in the center of the connection port 43 in order to facilitate electrical connection with the lead electrodes 90 from both sides in the Ya direction of the COF substrate 98. There is. In other words, the COF substrate 98 is arranged closer to one side surface of the connection port 43 in the Ya direction (Ya1 side in FIG. 8), and as a result, the COF substrate 98 is placed in either introduction path 44 in the Ya direction. They are placed close together. However, in the flow path member 200, the distance between the flow path member 200 and the COF substrate 98 in the Ya direction is made substantially constant on both the Ya1 side and the Ya2 side, thereby preventing contact between the flow path member 200 and the COF substrate 98. , We are trying to reduce the size in the Ya direction.

The first flow path 241 provided in the flow path member 200 is connected to the corresponding head main body 110 via the first branch flow path 261 on the first surface 98a side of the inclined COF substrate 98 as described above. The second flow path 242 is connected to the corresponding head main body 110 via the second branch flow path 262 on the second surface 98b side.

This will be described in detail with reference to FIGS. 17 and 18. FIG. 18 is a schematic plan view of one of the recording heads according to the present embodiment as viewed from the Z2 side to the Z1 side in the Z direction.

As shown in FIG. 18, four introduction paths 44 are formed around the connection port 43 on the surface of the head body 110 on the Z2 side (see FIG. 7). Specifically, the two introduction paths 44a and the introduction path 44b are open on the Ya1 side in the Ya direction with respect to the connection port 43, and the position in the Xa direction is a position included in the connection port 43. The introduction path 44a is arranged on the Xa1 side in the Xa direction with respect to the introduction path 44b. Further, the remaining two introduction paths 44c and 44d are open on the Ya2 side in the Ya direction with respect to the connection port 43, and the position in the Xa direction is a position included in the connection port 43. The introduction path 44c is arranged on the Xa1 side in the Xa direction with respect to the introduction path 44d. The connection port 43 is formed to have substantially the same shape as the first opening 236, and the connection port 43 and the first opening 236 communicate with each other.

The introduction path 44a includes a second flow path 242a, that is, a second introduction flow path 282a (see FIG. 14), a second intersection flow path 252a, a second branch flow path 262a, a second vertical flow path 272a, and a second connection portion 292a. It is connected to the.

The introduction path 44b includes a second flow path 242b, that is, a second introduction flow path 282b (see FIG. 15), a second crossing flow path 252b, a second branch flow path 262b, a second vertical flow path 272b, and a second connection portion 292b. It is connected to the.

The introduction path 44c includes a first flow path 241a, that is, a first introduction flow path 281a (see FIG. 14), a first crossing flow path 251a, a first branch flow path 261a, a first vertical flow path 271a, and a first connection portion 291a. It is connected to the.

The introduction path 44d includes a first flow path 241b, that is, a first introduction flow path 281b (see FIG. 15), a first intersection flow path 251b, a first branch flow path 261b, a first vertical flow path 271b, and a first connection portion 291b. It is connected to the.

The relationship between these introduction paths 44a to 44d and the first flow path 241 and the second flow path 242 is the same for the six head main bodies 110.

In this way, the first flow path 241 is connected to the head main body 110 on the first surface 98a side of the COF substrate 98. Further, the second flow path 242 is connected to the head main body 110 on the second surface 98b side of the COF substrate 98.

Here, as shown in FIG. 17A, the COF substrate 98 is inclined toward the first surface 98a, and the opening 201 is also inclined toward the first surface 98a (Y2 side). When the opening 201 is inclined toward the first surface 98a in this way, sparse and dense can be provided in the region where the flow path 240 of the flow path member 200 can be formed.

"The region where the flow path 240 of the flow path member 200 can be formed is provided with sparse density" means that the region T of the flow path member 200 facing the head body 110 is in the Ya direction in which the COF substrate 98 is inclined. The area P on the first surface 98a side and the area Q on the second surface 98b side of the COF substrate 98 are divided with the opening 201 through which the COF substrate 98 is inserted, and the area Q is in the same plane in the Z direction. The width of the area P in the Ya direction is wider than the width of the region P in the Ya direction.

In the present embodiment, of the region T of the first flow path member 210, the second flow path member 220, and the third flow path member 230 facing the head main body 110 constituting the flow path member 200, the first surface in the Ya direction. The 98a side is the region P, and the second surface 98b side is the region Q. The figure is hatched to indicate these areas P and Q.

In the present embodiment, as shown in FIG. 17A, due to the inclination of the COF substrate 98, the region Q is in the Ya direction on the Z1 side surface of the first flow path member 210, which is one of the same surfaces described above. The width of the region P is widened by the width U1 of the region P, and the width of the region P is narrowed by that amount in the Ya direction. Similarly, on the surface of the second flow path member 220 on the Z2 side, which is one of the same surfaces described above, the region Q expands by the width U2 in the Ya direction, and the region P has the width in the Ya direction by that amount. It's getting narrower.

The width of the region Q in the Ya direction becomes wider from the Z1 side to the Z2 side in the Z direction. In the present embodiment, the difference in density between the area P and the area Q is larger in the first flow path member 210 than in the second flow path member 220. Similarly, the difference in sparseness and density of the region P and the region Q of the second flow path member 220 is larger than that of the third flow path member 230. That is, in the flow path member 200, the difference in density between the area P and the area Q increases as the flow path member 200 moves from the head body 110 to the relay board 140.

Then, in such a sparse region Q, the second branch flow path 262 provided in a plane parallel to the liquid injection surface 20a is located. "The second flow path 242 has a portion provided along the liquid injection surface 20a in the sparse region Q" means that at least a part of the flow paths constituting the second flow path 242 is in the above-mentioned region Q. , It means that it is provided in a plane parallel to the liquid injection surface 20a and then connected to the introduction path 44 of the head main body 110.

In the present embodiment, the second branch flow path 262a of the second flow path 242a is provided in the region Q. Further, of the second flow path 242b, the second branch flow path 262b is provided in the region Q.

In the recording head 100 according to the present embodiment, by inclining the COF substrate 98 toward the first surface 98a, the opening 201 of the flow path member 200 can also be provided by moving it toward the first surface 98a. Denseness can be provided in the region where the flow path 240 of the road member 200 can be formed. As a result, the second branch flow path 262 constituting the second flow path 242 can be arranged in a region Q wider than the region P. That is, since the second branch flow path 262 can be arranged in a wider area Q, it becomes easy to configure the optimum second flow path 242 according to the arrangement of the head body 110 and the like. In other words, the wider the region Q, the higher the degree of freedom in arranging the second flow path 242. The degree of freedom in arranging the second flow path 242 referred to here is a concept proportional to the width of the region Q in the Ya direction, and the higher the degree of freedom, the easier it is to form the second flow path 242 in the region Q. means. The second flow path 242 of the present embodiment corresponds to a flow path having a portion provided along the liquid injection surface on the second surface side of the present invention, and is the second branch flow path 262 of the present embodiment. Corresponds to a flow path provided along the liquid injection surface.

Further, according to the recording head 100 according to the present embodiment, by inclining the COF substrate 98, it is possible to form a sparse region Q whose width is widened in the Ya direction. Since the width in the Ya direction is widened in this way, the second branch flow path 262 forming a part of the second flow path 242 can be formed in the Ya direction without interfering with the COF substrate 98.

As a result, in the Ya direction of the second flow path member 220, the distance between the second branch flow path 262 and the plane A can be narrowed as compared with the comparative example described later, so that the second flow path member 220, that is, The flow path member 200 can be miniaturized in the Ya direction, whereby the width of the recording head 100 in the Ya direction can be miniaturized.

Further, as described above, in the present embodiment, the COF substrate 98 is arranged close to the side surface of the connection port 43 on the Ya1 side, and as a result, the COF substrate 98 is arranged in the introduction path 44 on the Ya1 side of the connection port 43. They are placed close together. Then, in order for the branch flow path 260 connected to the introduction path 44 via the vertical flow path 270 to have a constant distance from the COF substrate 98 in the Ya direction, the branch flow path 260 on the Ya1 side of the COF substrate 98 is arranged. The degree of freedom is narrowing. However, by inclining the COF substrate 98 toward the Ya2 side, which is the opposite side thereof, even in such a case, the degree of freedom in arranging the branch flow path 260 on the Ya1 side of the COF substrate 98 is increased, and the flow path member. It is possible to reduce the size of 200 in the Ya direction.

Incidentally, with a recording head in which the COF substrate 98 is not tilted, the above-mentioned miniaturization cannot be achieved. This will be described with reference to FIGS. 17 (a) and 17 (b).

Let V be the distance between the second opening 225 and the second branch flow path 262a shown in FIG. 17A in the Ya direction. On the other hand, FIG. 17B shows a schematic side view of the recording head according to the comparative example. The recording head 100'according to the comparative example has the same configuration as the recording head 100 except for the inclination of the COF substrate 98, the arrangement of the opening 201 along the COF substrate 98, and the size of the region T facing the head main body 110. Suppose there is.

In the recording head 100', in order to form the second branch flow path 262a' provided in a plane parallel to the liquid injection surface 20a in the Ya direction without interfering with the COF substrate 98, the interval is the same as that of the recording head 100. If V is maintained and formed, the second branch flow path 262a'must be provided on the Ya1 side in the Ya direction by the amount of the widened width U in the recording head 100. Therefore, in the recording head 100'according to the comparative example, the distance between the second branch flow path 262a'and the plane A becomes wide in the Ya direction of the flow path member 200, and the flow path member 200 is compact in the Ya direction. It cannot be converted. In other words, as shown in FIG. 17A, since the COF substrate 98 is tilted toward the first surface 98a, the second vertical flow path 272a is provided by the width U1 or the width U2 while maintaining the interval V. It can be brought closer to the COF substrate 98 side. That is, the flow path member 200 can be miniaturized in the Ya direction.

Further, in the recording head 100 according to the present embodiment, the first crossing flow path 251a and the second crossing flow path 252a of the first flow path 241 and the second flow path 242, and the first crossing flow path 251b and the second The intersecting flow paths 252b were arranged so as to overlap each other in the Z direction by changing their positions in the Z direction orthogonal to the liquid injection surface 20a. As a result, the shape of the liquid injection surface 20a of the recording head 100 in the surface direction can be reduced as compared with the case where a plurality of intersecting flow paths are all formed in the same plane.

Further, in the recording head 100 according to the present embodiment, the second branch flow path 262 and the head main body 110 are connected by a second vertical flow path 272 along the direction perpendicular to the liquid injection surface 20a. Therefore, in a plan view seen from the Z direction perpendicular to the liquid injection surface 20a, the range of the second vertical flow path 272 includes the second branch flow path 262 and the head due to the flow path inclined in the direction perpendicular to the liquid injection surface 20a. When connecting to the main body 110, it is smaller than the range occupied by this inclined flow path. That is, as in the present embodiment, by connecting the second crossing flow path 252 and the head main body 110 by the second vertical flow path 272, the size of the flow path member 200 in the plan view can be reduced. It will be possible. Similarly, since the first branch flow path 261 and the head main body 110 are connected by the first vertical flow path 271 along the direction perpendicular to the liquid injection surface 20a, this also causes the flow path member 200 in the plan view. It is possible to reduce the size.

The width of the vertical flow path 270 in the Ya direction may be smaller than the width of the branch flow path 260 in the Ya direction. In that case, the degree of freedom in arranging the vertical flow path 270 and the branch flow path 260 can be further increased while maintaining the distance V from the opening 201 as compared with the case where this is not the case. In addition, the cross section of the vertical flow path 270 may be smaller than the cross section of the branch flow path 260. In that case, the flow velocity in the vertical flow path 270 can be increased, and the bubbles in the vertical flow path 270 can be efficiently discharged.

Here, it is assumed that the second flow path 242 is formed in the region P. In this case, as described above, the farther the flow path member 200 is from the head body 110 in the Z direction, the wider the width of the region Q in the Ya direction and the narrower the width of the region P in the Ya direction. In particular, assuming that the COF substrate 98 is arranged close to the side surface of the connection port 43 on the Ya2 side, the width of the region P in the Ya direction is increased in order to maintain a constant distance from the COF substrate 98 in the Ya direction. It becomes even narrower. Therefore, when the side where the COF substrate 98 is close to the side surface of the connection port 43 in the Ya direction (for example, the Ya2 side) and the side where the COF substrate 98 is inclined in the Ya direction (similarly, for example, the Ya2 side) coincide with each other. , The degree of freedom of arranging the second flow path 242 in the region P is low, and the arrangement of the second flow path 242 becomes very difficult. However, in the present embodiment, by forming the second branch flow path 262 in the region Q, the degree of freedom in the arrangement of the second branch flow path 262 is increased, and the flow path member 200 is miniaturized in the Ya direction. .. Further, by not matching the side where the COF substrate 98 is close to the side surface of the connection port 43 in the Ya direction (for example, the Ya1 side) and the side where the COF substrate 98 is inclined in the Ya direction (similarly, for example, the Ya2 side). The degree of freedom in arranging the branch flow path 260 on the side where the COF substrate 98 is close to the side surface of the connection port 43 in the Ya direction is increased, and the flow path member 200 is miniaturized in the Ya direction.

On the other hand, it is assumed that the first flow path 241 is formed in the region Q. In this case, the flow path member 200 forms the first flow path 241 on the side closer to the head body 110 in the Z direction, although the width of the region Q in the Ya direction becomes wider as the distance from the head body 110 in the Z direction increases. Therefore, the region Q widened in the Ya direction cannot be fully utilized. In particular, as in the present embodiment, in order to reduce the shape of the liquid injection surface 20a in the plane direction, the first crossing flow path 251a and the second crossing flow path 252a, the first crossing flow path 251b, and the second crossing flow path 251b and the second crossing flow path 251b. Assuming that the flow paths 252b are arranged so as to be overlapped in the Z direction by changing their positions in the Z direction, when both the first branch flow path 261 and the second branch flow path 262 are formed in the region Q, the first The degree of freedom is not high as compared with the case where the two-branch flow path 262 is formed in the region Q and the first branch flow path 261 is formed in the region P. However, in the present embodiment, by forming the first branch flow path 261 in the region P, the degree of freedom in the arrangement of the first branch flow path 261 is increased, and the flow path member 200 is miniaturized in the Ya direction. .. Further, with respect to the first crossing flow path 251 and the second crossing flow path 252 which are overlapped in the Z direction, the first branch flow path 261 and the second branch flow path 262 are not arranged so as to overlap in the Z direction. , The degree of freedom of arrangement of the first branch flow path 261 and the second branch flow path 262 is increased, and the flow path member 200 is miniaturized in the Ya direction.

Further, as described above, in the COF substrate 98 according to the present embodiment, the width of the upper end portion 98d in the surface direction (Xa direction) is narrower than the width of the lower end portion 98c (see FIG. 16) in the surface direction. Then, the opening 201 is formed in accordance with the COF substrate 98. Therefore, since the upper end portion 98d of the COF substrate 98 is narrowed in the surface direction, the flow path member 200 is formed with regions W on which the second flow path 242 can be formed on both outer sides of the second opening 216 in the surface direction. Has been done.

In the present embodiment, the second crossing flow path 252 and the second branch flow path 262 of the second flow path 242 are formed in the first flow path member 210 and the second flow path member 220. Therefore, in the first flow path member 210 and the second flow path member 220, the outer portion of the openings 215 and 225 in the Xa direction becomes the region W (see FIG. 16). In the present embodiment, the first crossing flow path 251 and the second crossing flow path 252 are arranged so as to overlap each other in the Z direction (see FIGS. 14 and 15). In this case, when the first crossing flow path 251 and the second crossing flow path 252 are projected onto the liquid injection surface 20a in the Z direction, the images do not have to completely match each other. The arrangement may be such that some of them overlap, and further, at least a part of the image of the second crossing flow path 252 is an image of the first crossing flow path 251 in the X direction rather than the image of the first crossing flow path 251. It may be inside. That is, the second crossing flow path 252a of the second flow path 242a may be formed so as to pass through the region W. Not limited to the second crossing flow path 252a, the second crossing flow path 252b and the second branch flow path 262 may be formed so as to pass through the region W. In these cases, for example, the second crossing flow path 252 and the second branch flow path 262 are provided at positions that interfere with the lower end portion 98c, which is one end portion of the COF substrate 98, when viewed from the Z direction. Even so, interference with the COF substrate 98 can be avoided at the position where the second crossing flow path 252 and the second branch flow path 262 are provided in the Z direction.

In this way, by forming the COF substrate 98 whose upper end 98d is narrower than the lower end 98c and providing the opening 201 in accordance with the COF substrate 98, the second flow is outside the COF substrate 98 in the Xa direction. A region W forming the road 242a can be provided. The same applies to the second flow path 242b. As a result, the degree of freedom in arranging the second flow path 242 on the flow path member 200 is further improved.

Further, as shown in FIG. 17A, a COF substrate 98 provided with a drive circuit 97 is inserted through the opening 201 of the flow path member 200. In this embodiment, the drive circuit 97 is provided on the second surface 98b side of the COF substrate 98.

Here, the drive circuit 97 may come into contact with the inner surface of the opening 201. Therefore, in order to avoid contact between the drive circuit 97 and the inner surface of the opening 201, the width of the opening 201 in the Ya direction is widened by the thickness of the drive circuit 97. By widening the width of the opening 201 in the Ya direction, the contact between the drive circuit 97 and the inner surface of the opening 201 can be effectively suppressed. At this time, the drive circuit 97 is arranged at a position accommodated in the second opening 225 of the second flow path member 220 and the third opening 235 of the third flow path member 230 in the Z direction. 1 It is not arranged at a position accommodated in the first opening 215 of the flow path member 210. Thereby, in the Ya direction, the width of the first opening 215 can be made smaller than the width of the second opening 225 and the width of the third opening 235. That is, a region for forming the second flow path 242 can be provided on the outside of the COF substrate 98 in the Ya direction. As a result, the degree of freedom in arranging the second flow path 242 on the flow path member 200 is further improved.

If the drive circuit 97 is arranged at a position accommodated in the first opening 215 of the first flow path member 210, the width of the first opening 215 in the Ya direction cannot be reduced. Therefore, the degree of freedom in arranging the second flow path 242 on the flow path member 200 cannot be improved.

On the other hand, in the recording head 100 according to the present embodiment, the drive circuit 97 is arranged at a position accommodated in the second opening 225 and the third opening 235 in the Z direction, and is arranged in the Ya direction of the first opening 215. By reducing the width, the degree of freedom in arranging the second flow path 242 such as the second crossing flow path 252 and the second branch flow path 262 on the flow path member 200 is improved.

Here, the first flow path 241 connected to the head main body 110 in the dense region P will be described. In the dense region P, the first branch flow path 261 provided in a plane parallel to the liquid injection surface 20a is located. "The first flow path 241 is connected to the head main body 110 in a dense region P" means that at least a part of the flow paths constituting the first flow path 241 is formed in the above-mentioned region P and the head main body 110 is formed. It means that it is connected to the introduction path 44 of. The first branch flow path 261 of the present embodiment corresponds to a flow path provided along the liquid injection surface on the first surface side of the present invention.

In the dense region P, since the width in the Ya direction is reduced, it may not be possible to secure a region P having a width sufficient for arranging the first branch flow path 261. However, in the present embodiment, the first flow path 241 is arranged closer to the head body 110 than the second flow path 242 in the Z direction.

As a result, even if the width of the region P in the Ya direction is narrowed due to the inclination of the COF substrate 98, the first flow path 241 can be connected to the head body 110 without being affected by it.

<Other Embodiments>
Although one embodiment of the present invention has been described above, the basic configuration of the present invention is not limited to the above.

For example, in each head body 110 of the recording head 100 according to the first embodiment, the nozzle row a and the nozzle row b are inclined in the Xa direction, and the nozzle row a and the nozzle row b are inclined with respect to the X direction which is the transport direction. In the case of making the recording head 100, the X direction and the Xa direction may intersect at more than 0 degrees and less than 90 degrees as described above, but the recording head 100 in a mode in which they do not intersect is also included in the present invention. Alternatively, the recording head provided with the head body 110 may be configured so that the Xa direction, which is the direction of the nozzle row, is perpendicular to the X direction, which is the transport direction. In this case, the Xa direction coincides with the Y direction, and the Ya direction coincides with the X direction. Therefore, in the recording head 100 according to the first embodiment, the size is reduced in the Ya direction, but in the recording head 100 in which the Ya direction is matched with the X direction, the X direction corresponding to the Ya direction, that is, the recording sheet S It will be possible to reduce the size in the transport direction.

In addition, the recording head 100 according to the first embodiment has a first flow path 241 and a second flow path 242, and has a first cross flow path 251 and a second cross flow path 252 at different positions in the Z direction, respectively. It had, but is not limited to such aspects. For example, the flow path parallel to the liquid injection surface 20a may be a recording head provided with a flow path member provided only on the same plane. For example, in the above-described embodiment, the recording head may be a recording head in which only the second flow path is provided in the flow path member provided with the first flow path member 210 and the second flow path member 220. As described above, if the recording head is not provided with either the first flow path 241 or the second flow path 242, the recording head 100 can be miniaturized in the Z direction.

Further, in the recording head 100 according to the first embodiment, the introduction paths 44c, 44d, 44a, 44b are provided with respect to the first flow path 241a, the first flow path 241b, the second flow path 242a, and the second flow path 242b, respectively. It was connected, but is not limited to such an embodiment. For example, the introduction paths 44c and 44b may be connected to the first flow path 241a and the first flow path 241b, respectively, and the introduction paths 44a and 44d may be connected to the second flow paths 242a and 242b, respectively. .. Further, in this case, as described above, the recording head may have only the second flow path and not the first flow path. An optimum flow path can be configured according to the arrangement of the head body 110 and the like.

Further, the first flow path member 210 and the second flow path member 220 are adhered to form the second flow path 242, and the second flow path member 220 and the third flow path member 230 are adhered to form the first flow path 241. However, the method of forming the first flow path 241 and the second flow path 242 is not limited to these. For example, it may be integrally molded without adhering two or more flow path members by a layered manufacturing method capable of three-dimensional molding. Alternatively, each flow path member may be formed by three-dimensional molding, die molding (injection molding, etc.), cutting, or pressing.

Further, the flow path member 200 has two first flow paths 241a and first flow path 241b as the first flow path 241 but is not limited to two and may be one or three or more. You may. The same applies to the second flow path 242.

The first crossing flow path 251a was branched into six first branch flow paths 261a, but the present invention is not limited to this, and the first crossing flow path 251a may be connected to one head body 110 without branching, and the number of branches may be six. It is not limited to one, and may be branched into two or more. The same applies to the first crossing flow path 251b, the second crossing flow path 252a, and the second crossing flow path 252b. Further, the number of COF substrates 98 tilted toward the first surface 98a is not limited to 6, and only a part of the COF substrates 98 may be tilted.

Further, the first crossing flow path 251a is a flow path for horizontally flowing ink between the second flow path member 220 and the third flow path member 230, but the present invention is not limited to this mode. That is, the flow path may be inclined with respect to the Z plane. The same applies to the first crossing flow path 251b, the second crossing flow path 252a, and the second crossing flow path 252b.

Further, the first vertical flow path 271a is formed perpendicular to the liquid injection surface 20a, but is not limited to such an embodiment. That is, it may be inclined with respect to the liquid injection surface 20a. The same applies to the first vertical flow path 271b, the second vertical flow path 272a, and the second vertical flow path 272b.

The second opening 216 of the opening 201 formed in the flow path member 200 does not need to be narrower in the Xa direction than the first opening 236. The width of the second opening 216 and the width of the first opening 236 in the Xa direction may be substantially equal, and the opening may accommodate a rectangular COF substrate 98. On the contrary, the width of the second opening 216 in the Xa direction may be wider than that of the first opening 236.

Further, although the COF substrate 98 is provided as the flexible wiring board, it may be a flexible printed circuit board (FPC). Further, even if the COF substrate 98 is not arranged close to the side surface of the connection port 43 on the Ya1 side, it is sufficient that the COF substrate 98 and the lead electrode 90 are electrically connected.

Further, in the first embodiment, the holding member 120 and the flow path member 200 are fixed by an adhesive or the like, but they may be integrated. That is, the holding portion 121 and the foot portion 122 may be provided on the Z1 side of the flow path member 200. As a result, the size of the holding members 120 can be reduced in the Z direction by the amount that the holding members 120 are not laminated in the Z direction. Further, since the holding portion 121 is provided in the flow path member 200, it is sufficient that the flow path member 200 can accommodate a plurality of head main bodies 110, and the relay board 140 does not have to be accommodated, so that the size can be reduced in the XY directions as well. .. Further, by integrating a plurality of members, the number of parts can be reduced. When the flow path member 200 is composed of the first flow path member 210, the second flow path member 220, and the third flow path member 230, the holding portion 121 and the foot portion are on the Z1 side of the third flow path member 230. 122 and may be provided.

Further, in the first embodiment, the head main body 110 is arranged in the Y direction, and the recording head 100 is formed by a plurality of head main bodies 110, but the recording head 100 may be formed by one head main body 110. Further, the number of recording heads 100 included in the head unit 101 is not particularly limited, and two or more recording heads 100 may be mounted, or one recording head 100 may be mounted alone in the inkjet recording device 1. May be good.

The above-mentioned inkjet recording device 1 is a so-called line-type recording device in which the head unit 101 is fixed and printing is performed only by transporting the recording sheet S, but the head unit 101 is not particularly limited to this. One or a plurality of recording heads 100 are mounted on the carriage, the head unit 101 or the recording head 100 is moved in the main scanning direction intersecting the conveying direction of the recording sheet S, and the recording sheet S is conveyed for printing. The present invention can also be applied to a so-called serial type recording device.

Further, the present invention is intended for a wide range of liquid injection head units in general, for example, manufacturing recording heads such as various inkjet recording heads used in image recording devices such as printers, and color filters such as liquid crystal displays. Also for liquid injection head units including color material injection heads used in the above, organic EL displays, electrode material injection heads used for electrode formation such as FED (field emission display), bioorganic material injection heads used for biochip production, etc. Can be applied.

Further, the wiring board of the present invention is not limited to the case where it is used for a liquid injection head, and can be applied to any electronic circuit or the like.

1 Inkjet recording device (liquid injection device), 43 connection port, 44a, 44b, 44c, 44d introduction path, 97 drive circuit, 98 COF board, 98a first surface, 98b second surface, 98c lower end, 98d Upper end, 100 recording head, 101 head unit, 110 head body, 140 relay board, 200 flow path member, 201 opening, 210 first flow path member, 216 second opening, 220 second flow path member, 230th 3 flow path member, 236 first opening, 240 flow path, 241 first flow path, 242 second flow path, 251 first cross flow path, 252 second cross flow path, 261 first branch flow path, 262 second flow path. Branch flow path, 271 first vertical flow path, 272 second vertical flow path, 281 first introduction flow path, 282 second introduction flow path, 291 first connection part, 292 second connection part, 300 piezoelectric actuator

Aspects of the present invention for solving the above problems include a plurality of nozzle openings for injecting liquid in the injection direction, a first piezoelectric layer deformed to inject liquid from a part of the plurality of nozzle openings, and the above. A flow path provided with a first flexible wiring board that is electrically connected to the first piezoelectric layer and a first opening that penetrates in the injection direction and into which the first flexible wiring board is inserted. The flow path member includes a first crossing flow path that communicates with a part of the plurality of nozzle openings, a second crossing flow path that communicates with a part of the plurality of nozzle openings, and the plurality of. A third crossing flow path communicating with a part of the nozzle openings of the above and a fourth crossing flow path communicating with a part of the plurality of nozzle openings are defined, and the first, second, third and fourth crossings are defined. Each of the flow paths extends in the longitudinal direction of the flow path member, and at least a part of the first and second cross flow paths overlaps in the injection direction, and the third and fourth cross flow paths overlap. Is at least partially overlapped in the injection direction, and the first opening is arranged between the second crossing flow path and the fourth crossing flow path in a direction orthogonal to the longitudinal direction. It is in a liquid injection head characterized by being
Another aspect of the present invention for solving the above problems is to supply a plurality of head bodies having a liquid injection surface on which a liquid is jetted, a flexible wiring board connected to each head body, and a liquid for each head body. The flow path member is provided with a flow path member to be provided, the flow path member has a plurality of openings through which the flexible wiring board is inserted, and the flexible wiring board has the flow path member with respect to the head body. It extends to the side and is tilted toward the first surface side of both sides of the flexible wiring board between the head body and the flow path member, and the flow path is of both sides of the flexible wiring board. On the second surface side, there is a portion provided along the liquid injection surface, and the first flow path and the second flow path are connected to the head main body, and the first flow path is The first surface side has a first branch flow path provided along the liquid injection surface, and the second flow path is provided along the liquid injection surface on the second surface side. The liquid injection head has a second branch flow path, and the first branch flow path is closer to the head main body in a direction orthogonal to the liquid injection surface than the second branch flow path.
In such an embodiment, by inclining the flexible wiring board toward the first surface side, the opening of the flow path member can also be moved to the first surface side, and the flow path of the flow path member is densely distributed in the area where the flow path can be formed. Can be provided. Let P be a dense region on the first surface side of the opening of the flow path member, and Q be a sparse region on the second surface side. In this way, since the flow path can be arranged in a wider area Q, it becomes easy to configure an optimum flow path according to the arrangement of the head body and the like. In particular, when the flow path along the liquid injection surface is provided, it is possible to prevent the flow path from interfering with the flexible wiring board. Further, in order to prevent interference with the flexible wiring board, the width of the liquid injection head in the above direction is smaller than that in the case where the flow path along the liquid injection surface is moved to the second surface side to widen the flow path member. Can be transformed into.
Further, in the region Q, the second branch flow path can be formed in the flow path member with a higher degree of freedom as compared with the case where the first branch flow path close to the head body is provided in the direction perpendicular to the liquid injection surface. .. Further, since a plurality of flow paths can be arranged so as to be stacked in a direction orthogonal to the liquid injection surface, the shape of the liquid injection head in the liquid injection surface can be miniaturized.
Here, the first flow path has a first vertical flow path that connects the first branch flow path and the head body on the first surface side and is along a direction perpendicular to the liquid injection surface. It is preferable that the second flow path has a second vertical flow path on the second surface side that connects the second branch flow path and the head body and runs in a direction perpendicular to the liquid injection surface. .. According to this, the ranges of the first vertical flow path and the second vertical flow path occupying the flow path member in the plan view seen from the direction perpendicular to the liquid injection surface are the first branch flow path and the second branch flow path. It is smaller than the range occupied by the flow paths that connect the head body at an angle. That is, by connecting the first branch flow path and the second branch flow path and the head main body by the first vertical flow path and the second vertical flow path, respectively, the size of the flow path member in the plan view is reduced. It becomes possible.
Further, a plurality of head bodies having a liquid injection surface on which liquid is ejected, a flexible wiring board connected to each head body, and a flow path member provided with a flow path for supplying liquid to each head body. The flow path member has a plurality of openings through which the flexible wiring board is inserted, and the flexible wiring board extends toward the flow path member with respect to the head body and is head body. And the flow path member are tilted toward the first surface side of both sides of the flexible wiring board, and the flow path is directed to the liquid injection surface on the second surface side of both sides of the flexible wiring board. A first flow path and a second flow path are connected to the head body, and the first flow path is provided on the first surface side of the flexible wiring board. The second flow path has a first branch flow path provided in a direction parallel to the liquid injection surface and a first cross flow path connected to the plurality of the first branch flow paths. On the second surface side of the flexible wiring board, a second branch flow path provided in a direction parallel to the liquid injection surface, and a second cross flow path connected to the plurality of the second branch flow paths. It is preferable that the first crossing flow path and the second crossing flow path are on opposite sides of the flexible wiring board in the plane direction of the flexible wiring board. According to this, the branch flow path can be formed in the flow path member with a higher degree of freedom as compared with the case where the branch flow path is provided in the region P. Further, since the intersecting flow paths are opposite to each other in the surface direction of the flexible wiring board, a plurality of flow paths can be arranged without overlapping in the direction orthogonal to the liquid injection surface. The shape of the liquid injection head in the direction orthogonal to the liquid injection surface can be miniaturized.
Further, the flexible wiring board has one end portion close to the head body and the other end portion far from the head body in a direction perpendicular to the liquid injection surface, and the other end portion is more than the one end portion. It is preferable that the width of the flexible wiring board in the surface direction is narrowed, and the second flow path is formed in the flow path member so as to pass through the outer region of the other end in the surface direction. According to this, a region for forming the second flow path can be provided on the outside of the flexible wiring board in the plane direction (direction parallel to the plane) of the flexible wiring board. As a result, the degree of freedom in arranging the second flow path in the flow path member is further improved.
Further, it is preferable that the drive circuit is provided on the second surface side of the flexible wiring board. According to this, by widening the width of the opening toward the first surface side, it is possible to more effectively suppress the drive circuit from coming into contact with the inner surface of the opening, and it is possible to protect the drive circuit. Even if the width of the opening is widened to the first surface side, the above-mentioned dense region P side is only further narrowed, and it is possible to avoid narrowing the sparse region Q side.
Another aspect of the present invention is a liquid injection device including the above liquid injection head.
In such an embodiment, there is provided a liquid injection device provided with a flow path member capable of reducing the size and securing a larger area in which the liquid flow path can be arranged.
Another aspect of the present invention for solving the above problems is to supply a plurality of head bodies having a liquid injection surface on which a liquid is jetted, a flexible wiring board connected to each head body, and a liquid for each head body. The flow path member is provided with a flow path member to be provided, the flow path member has a plurality of openings through which the flexible wiring board is inserted, and the flexible wiring board has the flow path member with respect to the head main body. It extends to the side and is tilted toward the first surface side of both sides of the flexible wiring board between the head body and the flow path member, and the flow path is of both sides of the flexible wiring board. The liquid injection head is characterized by having a portion provided along the liquid injection surface on the second surface side.
In such an embodiment, by inclining the flexible wiring board toward the first surface side, the opening of the flow path member can also be moved to the first surface side, and the flow path of the flow path member is densely distributed in the area where the flow path can be formed. Can be provided. Let P be a dense region on the first surface side of the opening of the flow path member, and Q be a sparse region on the second surface side. In this way, since the flow path can be arranged in a wider area Q, it becomes easy to configure an optimum flow path according to the arrangement of the head body and the like. In particular, when the flow path along the liquid injection surface is provided, it is possible to prevent the flow path from interfering with the flexible wiring board. Further, in order to prevent interference with the flexible wiring board, the width of the liquid injection head in the above direction is smaller than that in the case where the flow path along the liquid injection surface is moved to the second surface side to widen the flow path member. Can be transformed into.

Claims (6)

A plurality of head bodies having a liquid injection surface on which a liquid is injected,
The flexible wiring board connected to each head body and
Each head body is provided with a flow path member provided with a flow path for supplying the liquid.
The flow path member has a plurality of openings through which the flexible wiring board is inserted.
The flexible wiring board extends to the flow path member side with respect to the head body, and is located on the first surface side of both sides of the flexible wiring board between the head body and the flow path member. Tilt,
The flow path has a portion provided along the liquid injection surface on the second surface side of both surfaces of the flexible wiring board.
A first flow path and a second flow path are connected to the head body.
The first flow path has a first branch flow path provided along the liquid injection surface on the first surface side.
The second flow path has a second branch flow path provided along the liquid injection surface on the second surface side.
The liquid injection head is characterized in that the first branch flow path is closer to the head body in a direction orthogonal to the liquid injection surface than the second branch flow path. In the liquid injection head according to claim 1,
The first flow path has a first vertical flow path on the first surface side that connects the first branch flow path and the head body and runs in a direction perpendicular to the liquid injection surface.
The second flow path is characterized by having a second vertical flow path on the second surface side that connects the second branch flow path and the head body and runs in a direction perpendicular to the liquid injection surface. Liquid injection head. A plurality of head bodies having a liquid injection surface on which a liquid is injected,
A flexible wiring board connected to each head body,
Each head body is provided with a flow path member provided with a flow path for supplying the liquid.
The flow path member has a plurality of openings through which the flexible wiring board is inserted.
The flexible wiring board extends to the flow path member side with respect to the head main body, and is located on the first surface side of both sides of the flexible wiring board between the head main body and the flow path member. Tilt,
The flow path has a portion provided along the liquid injection surface on the second surface side of both surfaces of the flexible wiring board.
A first flow path and a second flow path are connected to the head body.
The first flow path is
On the first surface side of the flexible wiring board, a first branch flow path provided in a direction parallel to the liquid injection surface, and
It has a first crossing flow path connected to the plurality of first branch flow paths, and has.
The second flow path is
A second branch flow path provided on the second surface side of the flexible wiring board in a direction parallel to the liquid injection surface, and
It has a second crossing flow path connected to the plurality of the second branch flow paths, and has.
A liquid injection head characterized in that the first crossing flow path and the second crossing flow path are on opposite sides of the flexible wiring board in the plane direction of the flexible wiring board. In the liquid injection head according to any one of claims 1 to 3.
The flexible wiring board has one end close to the head body and the other end far from the head body in a direction perpendicular to the liquid injection surface.
The other end portion is formed to have a narrower width in the surface direction of the flexible wiring board than the one end portion.
The liquid injection head is characterized in that the second flow path is formed in the flow path member so as to pass through a region outside the other end in the surface direction. In the liquid injection head according to any one of claims 1 to 4.
A liquid injection head characterized in that a drive circuit is provided on the second surface side of the flexible wiring board. A liquid injection device comprising the liquid injection head according to any one of claims 1 to 5.

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