JP6115337B2 - Liquid ejecting head and liquid ejecting apparatus - Google Patents

Description

  The present invention relates to a liquid ejecting head such as an ink jet recording head, and a liquid ejecting apparatus including the liquid ejecting head.

  The liquid ejecting apparatus is an apparatus that includes a liquid ejecting head capable of ejecting liquid as droplets from a nozzle and ejects various liquids from the liquid ejecting head. A typical example of the liquid ejecting apparatus is an ink jet recording that includes an ink jet recording head (hereinafter referred to as a recording head) and performs recording by ejecting liquid ink as ink droplets from the nozzle of the recording head. An image recording apparatus such as an apparatus (printer) can be given. In addition, liquid ejecting devices are used for ejecting various types of liquids such as color materials used for color filters such as liquid crystal displays, organic materials used for organic EL (Electro Luminescence) displays, and electrode materials used for electrode formation. It is used. The recording head for the image recording apparatus ejects liquid ink, and the color material ejecting head for the display manufacturing apparatus ejects solutions of R (Red), G (Green), and B (Blue) color materials. The electrode material ejecting head for the electrode forming apparatus ejects a liquid electrode material, and the bioorganic matter ejecting head for the chip manufacturing apparatus ejects a bioorganic solution.

  As the recording head as described above, a recording head main body that ejects liquid ink from nozzles, and a recording head main body to which the recording head main body is attached and ink is supplied from the liquid supply source in which ink is sealed to the recording head main body. And a liquid introducing member to be introduced. The recording head main body applies a pressure change to the ink in the pressure chamber by driving a piezoelectric element (a kind of pressure generating means), and ejects ink droplets from the nozzles formed on the nozzle surface using this pressure change. The liquid introduction member includes an ink flow path for sending ink from the liquid supply source to the recording head main body side.

  In addition, as an ink flow path, there is an ink flow path partially including an inclined flow path that extends in a direction obliquely intersecting the nozzle surface (for example, Patent Document 1). By such an ink flow path provided with an inclined flow path, an upstream flow path and a downstream flow path having different opening positions in a plan view (in a plane parallel to the nozzle surface) are connected. .

JP 2009-107189 A

  However, the ink flow path including the inclined flow path inclined with respect to the nozzle surface as described above is difficult to form, and the liquid introduction member cannot be easily formed. In addition, since the inclination angle of the inclined flow path is limited due to the structure of the mold, the length of the inclined flow path tends to increase accordingly. For this reason, the liquid introducing member is likely to be large during molding, and as a result, it is difficult to reduce the size of the recording head.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a liquid ejecting head and a liquid ejecting apparatus that can be easily created and can be reduced in size. is there.

The liquid ejecting head of the present invention includes a liquid introduction channel for introducing a liquid from a liquid supply source, a filter chamber provided with a filter for filtering the liquid from the liquid introduction channel, and a liquid in the filter chamber downstream. A liquid introduction member having a connection flow path to be sent to the side;
Connected to the liquid introduction member, the liquid from the connection flow path is introduced into the pressure chamber through the liquid flow path, and the pressure fluctuation is generated in the pressure chamber, so that it can be ejected as droplets from the nozzle formed on the nozzle surface A liquid ejecting head main body,
A parallel flow path portion extending in parallel with the nozzle surface is formed in a part of the connection flow path.

  According to the present invention, even when the position of the connection portion of the connection flow path in the filter chamber and the connection portion of the connection flow path and the liquid flow path are different in plan view (in a plane parallel to the nozzle face), the nozzle The connection flow path can be created without inclining with respect to the surface. Thereby, a liquid introduction member can be created easily. In addition, since the configuration of the connection channel is simplified and there is no restriction such as the inclination angle in the inclined channel, the height of the connection channel (the dimension in the direction perpendicular to the nozzle surface) can be suppressed as much as possible. it can. Thereby, it can suppress that a liquid introduction member becomes large, and a liquid ejecting head can be reduced in size.

In the above configuration, the liquid jet head main body includes a first liquid channel and a second liquid channel,
The filter chamber communicates with the upstream side of the first connection channel whose downstream side is connected to the first liquid channel and the second connection whose downstream side is connected to the second liquid channel. The upstream side of the channel is connected,
The distance between the communication part of the first connection channel and the communication part of the second connection channel in the filter chamber is such that the distance between the connection part of the first connection channel and the first liquid channel and the connection part of the first liquid channel Longer than the distance between the second connection flow path and the connection portion of the second liquid flow path,
It is desirable that a parallel flow path portion is formed in at least one of the first connection flow path and the second connection flow path.

  According to this configuration, it is possible to reduce the size of the liquid ejecting head main body while sufficiently securing the area of the filter (the cross-sectional area of the filter chamber). As a result, the liquid ejecting head can be further downsized.

  The liquid ejecting apparatus according to the aspect of the invention includes the liquid ejecting head having any one of the above-described configurations.

FIG. 3 is a perspective view illustrating a configuration of a printer. FIG. 3 is an exploded perspective view of the recording head as viewed obliquely from above. FIG. 4 is a schematic plan view of a recording head for explaining a positional relationship between a filter chamber and a unit head. FIG. 3 is an enlarged cross-sectional view of a main part of the recording head. FIG. 6 is an enlarged cross-sectional view of a main part of a recording head according to a second embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings. In the embodiments described below, various limitations are made as preferred specific examples of the present invention. However, the scope of the present invention is not limited to the following description unless otherwise specified. However, the present invention is not limited to these embodiments. In the following description, an ink jet printer (hereinafter referred to as a printer) equipped with an ink jet recording head (hereinafter referred to as a recording head) is taken as an example of the liquid ejecting apparatus of the present invention.

  The configuration of the printer 1 will be described with reference to FIG. The printer 1 is a device that records an image or the like by ejecting liquid ink onto the surface of a recording medium 2 (a kind of landing target) such as recording paper. The printer 1 includes a recording head 3 that ejects ink, a carriage 4 to which the recording head 3 is attached, a carriage moving mechanism 5 that moves the carriage 4 in the main scanning direction, and a platen roller 6 that transfers the recording medium 2 in the sub-scanning direction. Etc. Here, the ink is a kind of liquid in the present invention, and is stored in an ink cartridge 7 as a liquid supply source. The ink cartridge 7 is detachably attached to the recording head 3. It is also possible to employ a configuration in which the ink cartridge 7 is disposed on the main body side of the printer 1 and is supplied from the ink cartridge 7 to the recording head 3 through an ink supply tube.

  The carriage moving mechanism 5 includes a timing belt 8. The timing belt 8 is driven by a pulse motor 9 such as a DC motor. Accordingly, when the pulse motor 9 is operated, the carriage 4 is guided by the guide rod 10 installed on the printer 1 and reciprocates in the main scanning direction (width direction of the recording medium 2).

  FIG. 2 is an exploded perspective view showing the configuration of the recording head 3. The recording head 3 in the present embodiment includes a liquid introducing member 13, a recording head main body 14 (corresponding to a liquid ejecting head main body in the present invention), and a fixed plate 15. In the recording head 3 of the present embodiment, two recording head bodies 14 that are elongated along the sub-scanning direction are attached below the liquid introduction member 13 in parallel with the main scanning direction. Further, one type of ink (for example, black ink) is introduced into one recording head main body 14, and three types of ink (for example, cyan, magenta, and yellow) are introduced into the other recording head main body 14. Ink) is introduced.

  The liquid introducing member 13 includes a cartridge holding member 17, an intermediate member 18, a filter lower member 19, a bush 20, a holder 21, and the like stacked. Further, inside the liquid introduction member 13, a liquid introduction flow path 23 for introducing ink from the ink cartridge 7, a filter chamber 25 provided with a filter 24 for filtering the ink from the liquid introduction flow path 23, and A connection flow path 26 is provided for sending the ink in the filter chamber 25 to the downstream side (recording head main body 14 side). In the following description, the stacking direction of each member will be described as the vertical direction for convenience.

  The cartridge holding member 17 includes a cartridge mounting portion 28 on the upper surface of which the ink cartridge 7 is mounted, and a flow path member including an ink flow path (not shown) constituting a part of the liquid introduction flow path 23 therein. It is. In the cartridge mounting portion 28, ink introduction needles 29 are arranged side by side in the main scanning direction so as to correspond to the inks of the ink cartridges 7 of the respective colors. In this embodiment, since four types of ink cartridges 7 are mounted, four ink introduction needles 29 are provided in the cartridge mounting portion 28. The ink introduction needle 29 is a hollow needle-like member that is inserted into the ink cartridge 7, and the ink retained in the ink cartridge 7 from an introduction hole (not shown) provided at the distal end is a cartridge holding member. 17 is introduced into the ink flow path.

  The intermediate member 18 is a plate-like flow path member connected below the cartridge holding member 17. As shown in FIG. 4, the intermediate member 18 has an upstream filter chamber 25a that forms the upstream side of the filter chamber 25, and an intermediate flow channel 30 that connects the upstream filter chamber 25a and the ink flow channel. And are formed. Four upstream filter chambers 25 a and four intermediate flow paths 30 are formed corresponding to the four ink introduction needles 29. The upstream filter chamber 25a is a space which forms a pair with a downstream filter chamber 25b described later and constitutes the filter chamber 25. As shown in FIG. 3, the upstream filter chamber 25a corresponds to one recording head main body 14. One side of the intermediate member 18 in the main scanning direction (one recording head main body 14 side) and the other side of the intermediate member 18 in the main scanning direction (the other recording head main body 14 side) corresponding to each color of the other recording head main body 14. Three are provided on the recording head main body 14 side. The three upstream filter chambers 25a corresponding to the other recording head main body 14 are formed so that the lower opening area thereof is smaller than the upstream filter chamber 25a corresponding to the one recording head main body 14 side, and along the sub-scanning direction. Side by side. Moreover, as shown in FIG. 4, each upstream filter chamber 25a is expanded in diameter from the upstream side (the communication portion with the intermediate flow path 30) toward the lower side (the filter 24 side).

  The upstream side of each intermediate flow path 30 is arranged side by side in the main scanning direction corresponding to the ink introduction needle 29, and communicates with the ink flow path of the cartridge holding member 17. Further, the downstream side of each intermediate flow path 30 communicates with a substantially central portion of the upstream filter chamber 25a in plan view. That is, each intermediate flow path 30 extends in the surface direction of the intermediate member 18 from the position where the cartridge holding member 17 communicates with the ink flow path toward the corresponding filter chamber 25a. A series of channels including the ink introduction needle 29, the ink channel, and the intermediate channel 30 correspond to the liquid introduction channel 23 in the present invention.

  The filter lower member 19 is a flow path member connected to the lower side of the intermediate member 18 with the filter 24 interposed therebetween. As shown in FIG. 4, the filter lower member 19 includes a downstream filter chamber 25 b that forms the downstream side of the filter chamber 25, and a communication channel 35 (described later) between the downstream filter chamber 25 b and the holder 21. And an ink supply channel 32 that communicates with each other. As shown in FIG. 2 or 4, the upper end of the downstream filter chamber 25 b opens at a position corresponding to each upstream filter chamber 25 a on the upper surface of the filter lower member 19. The shape of the upper end opening of the downstream filter chamber 25b is arranged to be substantially the same as the shape of the lower end opening of the upstream filter chamber 25a. Each downstream filter chamber 25b and the upstream filter chamber 25a communicate with each other via a filter 24 sandwiched therebetween to form a filter chamber 25.

  As shown in FIG. 3, the filter chamber 25 of the present embodiment is long in the main scanning direction (the direction along the width direction of the recording head main body 14) and is in the sub-scanning direction (the direction along the longitudinal direction of the recording head main body 14). ) In the shape of a short substantially oval. The width in the main scanning direction of the filter chamber 25 is longer than the width in the same direction of the recording head main body 14. An end of one side of each filter chamber 25 (the center side of the liquid introduction member 13) is disposed so as to overlap directly above the recording head main body 14 in a plan view (in a plane parallel to the nozzle surface 58). . Further, the end of each filter chamber 25 on the other side (outside the liquid introduction member 13) is disposed at a position away from the recording head main body 14 in plan view.

  Further, two ink supply channels 32 communicate with each filter chamber 25 (each downstream filter chamber 25b). In the present embodiment, as shown in FIG. 3 or FIG. 4, the upper end (upstream side) of the ink supply channel 32 communicates with both ends of the filter chamber 25 in the main scanning direction. Specifically, the upper end of the first ink supply channel 32a communicates with one end (the central side of the liquid introduction member 13) of each filter chamber 25 in the main scanning direction, and the other side (the liquid introduction member 13). The upper end of the second ink supply channel 32b communicates with the outer side of the second ink supply channel 32b. That is, the communication portion of the first ink supply channel 32a in the filter chamber 25 is disposed so as to overlap the recording head main body 14 (ink introduction port 69) in plan view. On the other hand, the communicating portion of the second ink supply channel 32b in the filter chamber 25 is disposed at a position away from the recording head main body 14 (ink introduction port 69) in plan view. By providing the ink supply channels 32a and 32b at both ends of the filter chamber 25 in this way, the ink discharge performance from the filter chamber 25 to the ink supply channels 32a and 32b and the bubble discharge performance during cleaning are improved. be able to. In addition, since the liquid introduction member 13 of the present embodiment includes four filter chambers 25, eight ink supply channels 32 are provided corresponding to these filter chambers 25. Further, the lower end (downstream side) of each ink supply channel 32 protrudes downward (on the holder 21 side) from the lower surface of the filter lower member 19.

  The bush 20 disposed below the filter lower member 19 is made of an elastic body such as an elastomer or rubber sandwiched between a protruding portion at the lower end of the ink supply channel 32 and a cylindrical portion 36 of the holder 21 described later. It is a plate-shaped member. As shown in FIG. 2 or 4, a through hole 41 is provided in a portion corresponding to the ink supply flow path 32 of the bush 20. The ink supply flow path 32 and the communication flow path 35 (described later) communicate with each other through the through hole 41 in a liquid-tight manner.

  The relay substrate 42 disposed below the bush 20 is a substrate to which the upper end of the flexible cable 73 extending from the recording head main body 14 is electrically connected. The relay substrate 42 sends a signal from a control unit (not shown) to the recording head main body 14 via the flexible cable 73. As shown in FIG. 2 or 4, an insertion hole 43 is formed in a portion corresponding to the communication flow path 35 of the relay substrate 42. The cylindrical portion 36 in which the communication channel 35 is formed is inserted into the insertion hole 43. The communication channel 35 communicates with the ink supply channel 32 via the bush 20 above the relay substrate 42.

  The holder 21 is a box-like member connected to the lower side of the filter lower member 19 with the bush 20 and the relay substrate 42 interposed therebetween. As shown in FIG. 2, the holder 21 in the present embodiment has an accommodation space 33 that is recessed from the upper surface to the middle of the lower part. In the accommodation space 33, the intermediate member 18, the filter 24, the bush 20, The relay substrate 42 is accommodated in a stacked state. The cartridge holding member 17 is attached from above the holder 21 in a state where these members are accommodated in the accommodation space 33. As shown in FIG. 4, a head accommodating portion 34 is provided inside the holder 21. The size of the head accommodating portion 34 is aligned with the size of the recording head main body 14. Further, the lower surface side of the head accommodating portion 34 is open. The recording head main body 14 is accommodated in the head accommodating portion 34 from the opening. In the present embodiment, since two recording head main bodies 14 are attached, two head accommodating portions 34 are provided correspondingly.

  In addition, as shown in FIG. 4, a communication flow path 35 that connects an ink supply flow path 32 of the filter lower member 19 and an ink introduction port 69 of the recording head main body 14 described later is provided inside the holder 21. Yes. The upper part of the communication channel 35 is formed inside a cylindrical portion 36 that protrudes upward from the bottom surface of the accommodation space 33. As shown in FIG. 3, eight communication channels 35 of the present embodiment are provided corresponding to the eight ink supply channels 32. The communication flow path 35 includes a flow path formed in the cylindrical portion 36 and an introduction portion 39 that communicates the flow path in the cylindrical portion 36 and the accommodation space 33. As shown in FIG. 4, the first communication flow path 35 a whose upper end communicates with the first ink supply flow path 32 a through the through hole 41 of the bush 20 has a vertical direction (perpendicular to the nozzle surface 58. The lower end (introducing portion 39) is open to the ceiling surface in the head accommodating portion 34. On the other hand, the second communication channel 35b whose upper end communicates with the second ink supply channel 32b has a crank shape in which a channel extending in the lateral direction (direction parallel to the nozzle surface) is provided in the middle. The lower end is open to the ceiling surface in the head accommodating portion 34. Specifically, the second communication channel 35b extends in the vertical direction (direction perpendicular to the nozzle surface 58) from the communication part with the second ink supply channel 32b toward the bottom surface of the storage space 33. A longitudinal channel portion 37, a parallel channel portion 38 extending in a direction parallel to the nozzle surface 58 from the lower end of the longitudinal channel portion 37 toward the first communication channel 35a, And an introduction part 39 extending in the vertical direction from the downstream end of the parallel flow path part 38 to the head accommodating part 34. The parallel flow path portion 38 of the present embodiment extends from the position deviated in the main scanning direction with respect to the head accommodating portion 34 to the position overlapping the head accommodating portion 34 along the main scanning direction in the bottom surface of the accommodating space 33. doing. For this reason, the distance between the upper end of the first communication flow path 35a and the upper end of the second communication flow path 35b is greater than the distance between the lower end of the first communication flow path 35a and the lower end of the second communication flow path 35b. Is also getting longer. The lower end (downstream side) of the introduction portion 39 is open to the ceiling surface in the head accommodating portion 34.

  The first ink supply channel 32a and the first communication channel 35a that communicate with each other through the through hole 41 correspond to the first connection channel 26a in the present invention, and the first ink supply channel 32a that communicates with each other through the through hole 41. The two ink supply channels 32b and the second communication channel 35b correspond to the second connection channel 26b in the present invention. The distance between the communication portion of the first connection flow path 26a and the communication portion of the second connection flow path 26b in the filter chamber 25 is the lower end of the first connection flow path 26a (first connection flow path 26a and More than the distance between the connecting portion of the first liquid channel 75a described later) and the lower end of the second connecting channel 26b (the connecting portion of the second connecting channel 26b and the second liquid channel 75b described later). It is getting longer.

  Next, the recording head main body 14 will be described with reference to FIG. In this embodiment, one recording head main body 14 into which one kind of ink is introduced and the other recording head main body 14 into which three kinds of ink are introduced are provided. Therefore, the configuration on the other recording head main body 14 side is omitted in FIG. The recording head main body 14 is provided with two nozzle rows in which a plurality of nozzles 57 are arranged. A configuration corresponding to the nozzle row on one side and a configuration corresponding to the nozzle row on the other side are provided. Since it is symmetrical in the left-right direction (width direction of the recording head main body 14), the description will be given focusing on the configuration on one side.

  As shown in FIG. 2 or FIG. 4, the recording head main body 14 in this embodiment includes a pressure generating unit 50 and a flow path unit 51, and these members are stacked and attached to the head case 56. Yes. The head case 56 is a box-shaped member made of synthetic resin that constitutes most of the recording head main body 14. A through hole 68 having a rectangular opening elongated along the nozzle row direction is formed in the center portion of the head case 56 so as to penetrate the height direction of the head case 56. One end of the flexible cable 73 is accommodated in the through space 68.

  Further, the head case 56 is formed with an ink introduction port 69 and a liquid chamber forming void 70. The ink introduction port 69 is a flow path provided for each liquid chamber forming void 70, and the lower end thereof communicates with the liquid chamber forming void 70. Further, the upper end of the ink introduction port 69 is liquid-tightly connected to the lower end of the communication flow path 35 (connection flow path 26) opened in the head accommodating portion 34 using an adhesive, packing, or the like (not shown). The liquid chamber forming empty section 70 is formed corresponding to each common liquid flow path 62 of the communication substrate 53, and communicates with the corresponding common liquid flow path 62 to define a common liquid chamber 71 (also referred to as a reservoir or a manifold). To do. In addition, in one recording head main body 14 into which one kind of ink is introduced, one common liquid chamber 71 (common liquid flow path 62) is formed on both sides of the through space 68, which corresponds to this. Thus, a total of two liquid chamber forming cavities 70 are formed, one on each side of the through vacant space 68. On the other hand, in the other recording head main body 14 into which three types of ink are introduced, three common liquid chambers 71 (common liquid flow paths 62) are formed on both sides of the penetrating space 68 and are partitioned by partition walls. Accordingly, correspondingly, three liquid chamber forming cavities 70 are formed on both sides of the penetrating vacant space 68. Then, the ink introduction port 69 corresponding to the upper end portion of each liquid chamber forming empty portion 70 communicates.

  The flow path unit 51 includes a nozzle plate 52, a communication substrate 53, and a compliance substrate 54. The communication substrate 53 is a plate material on which a common liquid channel 62, individual communication ports 63, and the like are formed. The common liquid flow path 62 communicates with the corresponding liquid chamber empty portion on the upstream side to form a common liquid chamber 71. The individual communication ports 63 are channels that connect the common liquid channel 62 and the pressure chambers 61, and a plurality of individual communication ports 63 are formed along the nozzle row direction corresponding to the pressure chambers 61. In addition, the lower surface of the common liquid channel 62 is sealed with a compliance substrate 54. The compliance substrate 54 is a thin sheet material made of a synthetic resin or metal having flexibility. The compliance substrate 54 functions as a compliance unit that absorbs pressure fluctuations in the ink in the common liquid chamber 71.

  The nozzle plate 52 of the present embodiment configures the compliance substrate 54 that forms the lower surface of the common liquid channel 62 corresponding to the nozzle row on one side and the lower surface of the common liquid channel 62 that corresponds to the nozzle row on the other side. It is arranged between the compliance substrate 54. The nozzle plate 52 is a plate material made of a silicon substrate or the like in which a plurality of nozzles 57 are opened in a row at a pitch corresponding to the dot formation density. A plurality of nozzles 57 arranged in a row form a nozzle row (a kind of nozzle group). In the present embodiment, two nozzle rows are formed on the nozzle plate 52. The lower surface of the nozzle plate 52 corresponds to the nozzle surface 58 in the present invention.

  The pressure generating unit 50 includes a pressure chamber forming substrate 59 (a type of pressure chamber forming member) on which a pressure chamber 61 is formed, an elastic film (not shown), a so-called flexural vibration type piezoelectric element 65 (a type of pressure generating means). The protective substrate 60 is housed in the lower portion of the head case 56 in a united state. From each piezoelectric element 65, electrode wiring is extended to the penetrating space 68 side, and a terminal on one end side of the flexible cable 73 is connected to these electrode wiring. Each pressure chamber 61 communicates with the nozzle 57 via a nozzle communication path 66 formed in the communication substrate 53 on the side opposite to the individual communication port 63.

  Then, the ink introduced into the recording head main body 14 from the connection channel 26 through the ink introduction port 69 is introduced into the pressure chamber 61 through the common liquid chamber 71 and the individual communication port 63. When the drive signal from the control unit is supplied to the piezoelectric element 65 via the relay substrate 42 and the flexible cable 73 in a state where the pressure chamber 61 is filled with ink, the piezoelectric element 65 is bent, and the pressure fluctuation is generated in the pressure chamber 61. Arise. The recording head body 14 ejects ink droplets from the nozzles 57 by utilizing this pressure fluctuation.

  Of the series of liquid channels 75 including the ink inlet 69, the common liquid chamber 71, and the individual communication port 63, the liquid channel 75a connected to the first connection channel 26a is the first in the present invention. The liquid flow path 75b connected to the second connection flow path 26b corresponds to the second liquid flow path 75b in the present invention.

  Each recording head main body 14 is connected to a metal fixing plate 15 having an opening at a position facing the nozzle plate 52 (or nozzle row). Specifically, the bottom surface of the holder 21 and the bottom surface of each recording head main body 14 are connected to the upper surface of the fixed plate 15 in a state where each recording head main body 14 is accommodated in the head accommodating portion 34. Thereby, each recording head main body 14 is fixed to the holder 21.

  Thus, since the parallel flow path portion 38 extending in parallel with the nozzle surface 58 is formed in a part of the second connection flow path 26b, the connection flow is not inclined with respect to the nozzle surface 58. A path 26b can be created. Thereby, the liquid introduction member 13 can be created easily. Further, since the configuration of the connection flow path 26b is simplified and there is no restriction such as the inclination angle in the inclined flow path, the height of the connection flow path 26 (the dimension in the direction perpendicular to the nozzle surface 58) can be as much as possible. Can be suppressed. Thereby, it can suppress that the liquid introduction member 13 becomes large, and the recording head 3 can be reduced in size. Furthermore, the distance between the communication portion of the first connection flow channel 26a and the communication portion of the second connection flow channel 26b in the filter chamber 25 is determined by the connection portion of the first connection flow channel 26a and the first liquid flow channel 75a. Is longer than the distance between the second connection flow path 26b and the connection portion of the second liquid flow path 75b, so that the recording head body 14 can be downsized while ensuring a sufficient area of the filter 24. Can do. As a result, the recording head 3 can be further downsized.

  Incidentally, in the above embodiment, the parallel flow path portion 38 is provided in the second connection flow path 26b, that is, in the plan view, the ink introduction port 69 of the first liquid flow path 75a and the first ink supply are provided. The flow path 32a is disposed so as to overlap, and the ink introduction port 69 of the second liquid flow path 75b and the second ink supply flow path 32b are displaced from each other. However, the present invention is not limited to this. In short, it is only necessary that the parallel flow path portion is formed in at least one of the first connection flow path and the second connection flow path. For example, you may provide a parallel flow path part in a 1st connection flow path. In this case, in plan view, the ink introduction port of the second liquid channel and the second ink supply channel overlap each other, and the ink introduction port of the first liquid channel and the first ink supply channel are arranged. They are placed out of position.

  Further, like the recording head 3 'of the second embodiment shown in FIG. 5, the parallel flow path portions 38a' and 38b 'are provided in both the first connection flow path 26a' and the second connection flow path 26b '. May be provided. In the recording head 3 ′ of the second embodiment, the center of the filter chamber 25 ′ is aligned with the center of the recording head body 14 in the width direction of the recording head body 14. Then, in plan view, the center of the ink introduction port 69 of the first liquid channel 75a and the center of the first ink supply channel 32a ′ are shifted from each other, and the ink introduction port of the second liquid channel 75b. The center of 69 and the center of the second ink supply channel 32b 'are shifted from each other. Specifically, the ink introduction port 69 of the first liquid channel 75a is disposed on the second connection channel 26b ′ side with respect to the first ink supply channel 32a ′, and the second liquid channel 75b. The ink introduction port 69 is disposed closer to the first connection flow path 26a ′ than the second ink supply flow path 32b ′.

  The parallel flow path portions 38a 'and 38b' in the second embodiment are connected to the first communication flow path 35a 'that connects the ink introduction port 69 of the first liquid flow path 75a and the first ink supply flow path 32a'. , And a second communication channel 35b ′ connecting the ink introduction port 69 of the second liquid channel 75b and the second ink supply channel 32b ′. Specifically, the first communication flow path 35a ′ is formed in a vertical direction (a direction perpendicular to the nozzle surface 58) from the communication portion with the first ink supply flow path 32a ′ toward the bottom surface of the accommodation space 33 ′. ) Extending in the horizontal direction (the direction parallel to the nozzle surface 58) from the lower end of the vertical flow path portion 37a 'toward the second communication flow path 35b'. A parallel flow path portion 38a 'and an introduction portion 39a' extending in the vertical direction from the downstream end of the parallel flow path portion 38a 'to the head accommodating portion 34'. The second communication channel 35b 'extends in the vertical direction (the direction perpendicular to the nozzle surface 58) from the communication part with the second ink supply channel 32b' toward the bottom surface of the accommodation space 33 '. The longitudinal channel portion 37b 'existing in parallel and extending in the lateral direction (direction parallel to the nozzle surface 58) from the lower end of the longitudinal channel portion 37b' toward the first communication channel 35a 'side. A flow path part 38b 'and an introduction part 39b' extending in the vertical direction from the downstream end of the parallel flow path part 38b 'to the head accommodating part 34' are provided. In the present embodiment, the first communication channel 35a 'and the second communication channel 35b' are formed symmetrically in the left-right direction (the width direction of the recording head main body 14). Other configurations are the same as those in the above-described embodiment, and thus description thereof is omitted.

  In the above description, the ink jet recording head 3 which is a kind of liquid ejecting head has been described as an example. However, the present invention can also be applied to a liquid ejecting liquid other than ink. For example, a color material ejecting head used for manufacturing a color filter such as a liquid crystal display, an electrode material ejecting head used for forming an electrode such as an organic EL (Electro Luminescence) display, FED (surface emitting display), a biochip (biochemical element) The present invention can also be applied to bioorganic matter ejecting heads and the like used in the production of

  DESCRIPTION OF SYMBOLS 1 ... Printer, 3 ... Recording head, 7 ... Ink cartridge, 13 ... Liquid introduction member, 14 ... Recording head main body, 15 ... Fixed plate, 17 ... Communication board, 18 ... Cartridge holding member, 18 ... Intermediate member, 19 ... Filter Lower member, 20 ... Bush, 21 ... Holder, 23 ... Liquid introduction channel, 24 ... Filter, 25 ... Filter chamber, 25a ... Upstream filter chamber, 25b ... Downstream filter chamber, 26 ... Connection channel, 28 ... Cartridge Mounting part, 29 ... Ink introduction needle, 30 ... Intermediate flow path, 32 ... Ink supply flow path, 33 ... Storage space, 34 ... Head storage part, 35 ... Communication flow path, 36 ... Cylindrical part, 37 ... Vertical flow path 38, parallel flow path section, 39 ... introduction section, 41 ... through hole, 42 ... relay substrate, 43 ... insertion hole, 50 ... pressure generating unit, 51 ... flow path unit, 52 ... nozzle plate 53 ... Communication substrate, 54 ... Compliance substrate, 56 ... Head case, 57 ... Nozzle, 58 ... Nozzle surface, 59 ... Pressure chamber forming substrate, 60 ... Protection substrate, 61 ... Pressure chamber, 62 ... Common liquid flow path, 63 ... Individual communication port, 65 ... piezoelectric element, 66 ... nozzle communication passage, 68 ... penetrating cavity, 69 ... ink introduction port, 70 ... liquid chamber forming cavity, 71 ... common liquid chamber, 75 ... liquid channel

Claims (2)

A liquid introduction channel for introducing a liquid from a liquid supply source, a filter chamber provided with a filter for filtering the liquid from the liquid introduction channel, and a connection channel for sending the liquid in the filter chamber to the downstream side A liquid introducing member;
Connected to the liquid introduction member, the liquid from the connection flow path is introduced into the pressure chamber through the liquid flow path, and the pressure fluctuation is generated in the pressure chamber, so that it can be ejected as droplets from the nozzle formed on the nozzle surface A liquid ejecting head main body,
A part of the connection channel is formed with a parallel channel part extending in parallel to the nozzle surface ,
The liquid jet head body includes a first liquid channel and a second liquid channel,
The filter chamber communicates with the upstream side of the first connection channel whose downstream side is connected to the first liquid channel and the second connection whose downstream side is connected to the second liquid channel. The upstream side of the channel is connected,
The distance between the communication part of the first connection channel and the communication part of the second connection channel in the filter chamber is such that the distance between the connection part of the first connection channel and the first liquid channel and the connection part of the first liquid channel Longer than the distance between the second connection flow path and the connection portion of the second liquid flow path,
A liquid ejecting head, wherein a parallel flow path portion is formed in at least one of the first connection flow path and the second connection flow path. A liquid ejecting apparatus comprising the liquid ejecting head according to claim 1 .

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