Patent Publication Number: US-2022234356-A1

Title: Liquid ejecting head and liquid ejecting apparatus

Description:
The present application is a continuation of U.S. patent application Ser. No. 17/177,604, filed Feb. 17, 2021, which is based on, and claims priority from JP Application Serial Number 2020-027010, filed Feb. 20, 2020, the disclosures of which are hereby incorporated by reference herein in their entirety. 
    
    
     BACKGROUND 
     1. Technical Field 
     The present disclosure relates to a liquid ejecting head and a liquid ejecting apparatus. 
     2. Related Art 
     As described in JP-A-2013-184372, techniques of liquid ejecting heads that supply a liquid in a pressure chamber to a nozzle channel and eject the liquid from a nozzle that communicates with the nozzle channel have been known. 
     According to the related art described above, there is a possibility that a change in internal pressure of a certain nozzle channel has an influence on ink ejection of a nozzle channel adjacent to the certain nozzle channel and that the quality of an image formed by ink dots is deteriorated. When thickness of a partition between nozzle channels increases, the influence on the nozzle channel adjacent to the certain nozzle channel is reduced. However, the increase in thickness of the partition results in an increase in pitch at which nozzles are provided, and dot resolution may be lowered. 
     SUMMARY 
     A liquid ejecting head according to a preferred aspect of the disclosure includes: a first pressure chamber that extends in a first direction and applies pressure to a liquid; a second pressure chamber that extends in the first direction and applies pressure to the liquid; a nozzle channel that communicates with a nozzle for ejecting the liquid; a first communication channel that extends in a second direction orthogonal to the first direction and enables the first pressure chamber and the nozzle channel to communicate with each other; and a second communication channel that extends in the second direction and enables the second pressure chamber and the nozzle channel to communicate with each other, in which the nozzle channel includes a first portion that extends in the first direction and communicates with the first communication channel and a second portion that extends in a third direction crossing the first direction and orthogonal to the second direction and communicates with the first portion, and an angle formed between the first direction and the third direction is larger than 0° and smaller than 90°. 
     A liquid ejecting apparatus according to a preferred aspect of the disclosure includes: a first pressure chamber that extends in a first direction and applies pressure to a liquid; a second pressure chamber that extends in the first direction and applies pressure to the liquid; a nozzle channel that communicates with a nozzle for ejecting the liquid; a first communication channel that extends in a second direction orthogonal to the first direction and enables the first pressure chamber and the nozzle channel to communicate with each other; and a second communication channel that extends in the second direction and enables the second pressure chamber and the nozzle channel to communicate with each other, in which the nozzle channel includes a first portion that extends in the first direction and communicates with the first communication channel and a second portion that extends in a third direction crossing the first direction and orthogonal to the second direction and communicates with the first portion, and an angle formed between the first direction and the third direction is larger than 0° and smaller than 90°. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a view for explaining an example of a liquid ejecting apparatus  100  according to an embodiment. 
         FIG. 2  is an exploded perspective view of a liquid ejecting head  1 . 
         FIG. 3  is a sectional view along line III-III in  FIG. 2 . 
         FIG. 4  is an enlarged sectional view of the vicinity of a piezoelectric element PZq. 
         FIG. 5  is an enlarged plan view of the vicinity of a nozzle channel RN[i]. 
         FIG. 6  is an enlarged plan view of the vicinity of a pressure chamber CB 1 [ i ] and a pressure chamber CB 2 [ i ]. 
         FIG. 7  is an enlarged plan view of the vicinity of a nozzle channel RN[i] according to a first modified example. 
         FIG. 8  is an enlarged plan view of the vicinity of a nozzle channel RN[i] according to a second modified example. 
         FIG. 9  is an enlarged plan view of the vicinity of a pressure chamber CB 1 C[i] and a pressure chamber CB 2 C[i] according to a third modified example. 
         FIG. 10  is an enlarged plan view of the vicinity of a nozzle channel RN[i] according to a fourth modified example. 
         FIG. 11  is an exploded perspective view of a liquid ejecting head  1 E according to a fifth modified example. 
         FIG. 12  is a plan view of the liquid ejecting head  1 E according to the fifth modified example. 
         FIG. 13  is a sectional view of the liquid ejecting head  1 E according to the fifth modified example. 
         FIG. 14  is a sectional view of the liquid ejecting head  1 E according to the fifth modified example. 
         FIG. 15  is an exploded perspective view of a liquid ejecting head  1 F according to a sixth modified example. 
         FIG. 16  is a plan view of the liquid ejecting head  1 F as viewed in the Z-axis direction. 
         FIG. 17  is an exploded perspective view of a liquid ejecting head  1 G according to a seventh modified example. 
         FIG. 18  is a sectional view of the liquid ejecting head  1 G according to the seventh modified example. 
         FIG. 19  is an enlarged plan view of the vicinity of a nozzle channel RNG[i]. 
         FIG. 20  illustrates an example of a configuration of a liquid ejecting apparatus  100 H according to an eighth modified example. 
     
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     An embodiment of the disclosure will be described below with reference to the drawings. Note that, in the drawings, dimensions and scales of components appropriately differ from actual ones. Since the embodiment described below is a preferred specific example of the disclosure, various limitations that are desirable from a technical viewpoint are added. However, the scope of the disclosure is not limited to the embodiment as long as there is no description particularly limiting the disclosure in the following description. 
     1. Embodiment 
     A liquid ejecting apparatus  100  according to the present embodiment will be described below with reference to  FIG. 1 . 
     1.1. Outline of Liquid Ejecting Apparatus  100   
       FIG. 1  is a view for explaining an example of the liquid ejecting apparatus  100  according to the present embodiment. The liquid ejecting apparatus  100  according to the present embodiment is an ink jet printing apparatus that ejects ink onto a medium PP. Although the medium PP is typically a printing sheet, any printing object made from a resin film, fabric, or the like can be used as the medium PP. 
     As illustrated in  FIG. 1 , the liquid ejecting apparatus  100  includes a liquid container  93  that accumulates ink. As the liquid container  93 , for example, a cartridge detachably attachable to the liquid ejecting apparatus  100 , a bag-like ink pack formed from a flexible film, or an ink tank that is able to be replenished with ink is able to be adopted. The liquid container  93  accumulates a plurality of types of inks of different colors. 
     As illustrated in  FIG. 1 , the liquid ejecting apparatus  100  includes a control device  90 , a moving mechanism  91 , a transport mechanism  92 , and a circulation mechanism  94 . 
     Among these, the control device  90  includes, for example, a processing circuit such as a CPU or FPGA and a storage circuit such as semiconductor memory and controls respective elements of the liquid ejecting apparatus  100 . Here, “CPU” is an abbreviation for central processing unit, and “FPGA” is an abbreviation for field programmable gate array. 
     The moving mechanism  91  transports the medium PP in the +Y direction in accordance with control of the control device  90 . Note that, in the following description, the +Y direction and the −Y direction, which is opposite to the +Y direction, are collectively referred to as the Y-axis direction. 
     The transport mechanism  92  causes a plurality of liquid ejecting heads  1  to be reciprocated in the +X direction and the −X direction, which is opposite to the +X direction, in accordance with control of the control device  90 . Note that, in the following description, the +X direction and the −X direction are collectively referred to as the X-axis direction. Here, the +X direction is a direction crossing the +Y direction. The +X direction is typically a direction orthogonal to the +Y direction. The transport mechanism  92  includes a storage case  921  that houses the plurality of liquid ejecting heads  1  and an endless belt  922  to which the storage case  921  is fixed. Note that the liquid container  93  may be housed in the storage case  921  together with the liquid ejecting heads  1 . 
     The circulation mechanism  94  supplies the ink, which is accumulated in the liquid container  93 , to a supply channel RB 1  provided in a liquid ejecting head  1  in accordance with control of the control device  90 . Further, in accordance with control of the control device  90 , the circulation mechanism  94  collects ink accumulated in a discharge channel RB 2  provided in the liquid ejecting head  1  and causes the collected ink to return to the supply channel RB 1 . Note that the supply channel RB 1  and the discharge channel RB 2  will be described later with reference to  FIG. 3 . 
     As illustrated in  FIG. 1 , a driving signal Com for driving the liquid ejecting head  1  and a control signal SI for controlling the liquid ejecting head  1  are supplied from the control device  90  to the liquid ejecting head  1 . Then, in accordance with control with the control signal SI, the liquid ejecting head  1  is driven with the driving signal Com to supply the ink, which is supplied to the supply channel RB 1 , to a nozzle channel RN provided in the liquid ejecting head  1  and to eject the ink in the +Z direction from a portion of or all M nozzles N provided in the liquid ejecting head  1 . Here, a value of M is a natural number of 1 or more. 
     The +Z direction is a direction orthogonal to the +X direction and the +Y direction. In the following description, the +Z direction and the −Z direction, which is opposite to the +Z direction, are collectively referred to as the Z-axis direction in some cases. Note that the nozzles N will be described later with reference to  FIGS. 2 and 3 . The nozzle channel will be described later with reference to  FIG. 3 . In conjunction with transport of the medium PP by the moving mechanism  91  and reciprocation of the liquid ejecting head  1  by the transport mechanism  92 , the liquid ejecting head  1  ejects the ink from a portion of or all the M nozzles N and causes the ejected ink to land on the surface of the medium PP to thereby form a desired image on the surface of the medium PP. 
     1.2. Outline of Liquid Ejecting Head 
     An outline of the liquid ejecting head  1  will be described below with reference to  FIGS. 2 to 6 . 
       FIG. 2  is an exploded perspective view of the liquid ejecting head  1 .  FIG. 3  is a sectional view along line III-III in  FIG. 2 . Line III-III is a virtual line segment passing through the nozzle channel RN. 
     As illustrated in  FIGS. 2 and 3 , the liquid ejecting head  1  includes a nozzle substrate  60 , a compliance sheet  61 , a compliance sheet  62 , a communication plate  2 , a pressure chamber substrate  3 , a vibrating plate  4 , an accumulation chamber forming substrate  5 , and a wiring substrate  8 . 
     As illustrated in  FIGS. 2 and 3 , the communication plate  2  is provided on the −Z side of the nozzle substrate  60 . The communication plate  2  is a plate member, which is elongated in the Y-axis direction and extends substantially parallel to the X-Y plane, and has an ink channel formed therein. 
     Specifically, one supply channel RA 1  and one discharge channel RA 2  are formed in the communication plate  2 . Of the supply channel RA 1  and the discharge channel RA 2 , the supply channel RA 1  communicates with the supply channel RB 1  described later and is provided so as to extend in the Y-axis direction. The discharge channel RA 2  communicates with the discharge channel RB 2  described later and is provided, in the −X direction as viewed from the supply channel RA 1 , so as to extend in the Y-axis direction. 
     In the communication plate  2 , M coupling channels RK 1  corresponding on a one-to-one basis to the M nozzles N, M coupling channels RK 2  corresponding on a one-to-one basis to the M nozzles N, M communication channels RR 1  corresponding on a one-to-one basis to the M nozzles N, M communication channels RR 2  corresponding on a one-to-one basis to the M nozzles N, M nozzle channels RN corresponding on a one-to-one basis to the M nozzles N, M coupling channels RX 1  corresponding on a one-to-one basis to the M nozzles N, and M coupling channels RX 2  corresponding on a one-to-one basis to the M nozzles N are formed. 
     Note that one coupling channel RX 1  may be provided in common to the M nozzles, and one coupling channel RX 2  may be provided in common to the M nozzles. The following description will be given by assuming that the M coupling channels RX 1  and the M coupling channels RX 2  are provided. 
     In the following description, a nozzle N in the m-th position as viewed in the −Y direction among the M nozzles N is sometimes expressed as a nozzle N[m] when m is a natural number of 1 or more and M or less. A coupling channel RK 1  corresponding to the nozzle N[m] is sometimes expressed as a coupling channel RK 1 [ m ]. A coupling channel RK 2  corresponding to the nozzle N[m] is sometimes expressed as a coupling channel RK 2 [ m ]. A communication channel RR 1  corresponding to the nozzle N[m] is sometimes expressed as a communication channel RR 1 [ m ]. A communication channel RR 2  corresponding to the nozzle N[m] is sometimes expressed as a communication channel RR 2 [ m ]. A nozzle channel RN corresponding to the nozzle N[m] is sometimes expressed as a nozzle channel RN[m]. The nozzle N[m] is provided in the nozzle channel RN[m]. 
     The coupling channel RX 1  communicates with the supply channel RA 1  and is provided, in the −X direction as viewed from the supply channel RA 1 , so as to extend in the X-axis direction. The coupling channel RK 1  communicates with the coupling channel RX 1  and is provided, in the −X direction as viewed from the coupling channel RX 1 , so as to extend in the Z-axis direction. The communication channel RR 1  is provided, in the −X direction as viewed from the coupling channel RK 1 , so as to extend in the Z-axis direction. The coupling channel RK 2  communicates with the coupling channel RX 2  and is provided, in the +X direction as viewed from the coupling channel RX 2 , so as to extend in the Z-axis direction. The coupling channel RX 2  communicates with the discharge channel RA 2  and is provided, in the +X direction as viewed from the discharge channel RA 2 , so as to extend in the X-axis direction. The communication channel RR 2  is provided, in the +X direction as viewed from the coupling channel RK 2  and in the −X direction as viewed from the communication channel RR 1 , so as to extend in the Z-axis direction. The nozzle channel RN enables the communication channel RR 1  and the communication channel RR 2  to communicate with each other. The nozzle channel RN is positioned between a pressure chamber CB 1  and a pressure chamber CB 2  as viewed in the −Z direction. The nozzle channel RN communicates with the nozzle N corresponding to the nozzle channel RN. 
     Note that the communication plate  2  is manufactured such that, for example, a silicon monocrystalline substrate is processed by using a semiconductor manufacturing technique. Note that any known material and process can be adopted to manufacture the communication plate  2 . 
     Description will be given with reference back to  FIGS. 2 and 3 . As illustrated in  FIGS. 2 and 3 , the pressure chamber substrate  3  is provided on the −Z side of the communication plate  2 . The pressure chamber substrate  3  is a plate member, which is elongated in the Y-axis direction and extends substantially parallel to the X-Y plane, and has an ink channel formed therein. 
     Specifically, in the pressure chamber substrate  3 , M pressure chambers CB 1  corresponding on a one-to-one basis to the M nozzles N and M pressure chambers CB 2  corresponding on a one-to-one basis to the M nozzles N are formed. Among these, the pressure chamber CB 1  enables the coupling channel RK 1  and the communication channel RR 1  to communicate with each other and is provided, as viewed in the Z-axis direction, so as to couple an end of the coupling channel RK 1  on the +X side and an end of the communication channel RR 1  on the −X side and extend in the X-axis direction. The pressure chamber CB 2  enables the coupling channel RK 2  and the communication channel RR 2  to communicate with each other and is provided, as viewed in the Z-axis direction, so as to couple an end of the coupling channel RK 2  on the −X side and an end of the communication channel RR 2  on the +X side and extend in the X-axis direction. 
     In the following description, the pressure chamber CB 1  corresponding to the nozzle N[m] is sometimes expressed as a pressure chamber CB 1 [ m ]. The pressure chamber CB 2  corresponding to the nozzle N[m] is sometimes expressed as a pressure chamber CB 2 [ m ]. 
     Note that the pressure chamber substrate  3  is manufactured such that, for example, a silicon monocrystalline substrate is processed by using a semiconductor manufacturing technique. Note that any known material and process can be adopted to manufacture the pressure chamber substrate  3 . 
     Note that, in the following description, an ink channel that enables the supply channel RA 1  and the discharge channel RA 2  to communicate with each other is referred to as a circulation channel RJ. That is, M circulation channels RJ corresponding on a one-to-one basis to the M nozzles N enable the supply channel RA 1  and the discharge channel RA 2  to communicate with each other. Each of the circulation channels RJ includes the coupling channel RX 1  that communicates with the supply channel RA 1 , the coupling channel RK 1  that communicates with the coupling channel RX 1 , the pressure chamber CB 1  that communicates with the coupling channel RK 1 , the communication channel RR 1  that communicates with the pressure chamber CB 1 , the nozzle channel RN that communicates with the communication channel RR 1 , the communication channel RR 2  that communicates with the nozzle channel RN, the pressure chamber CB 2  that communicates with the communication channel RR 2 , the coupling channel RK 2  that communicates with the pressure chamber CB 2 , and the coupling channel RX 2  that communicates with the coupling channel RK 2  and the discharge channel RA 2 , as described above. 
     As illustrated in  FIGS. 2 and 3 , the vibrating plate  4  is provided on the −Z side of the pressure chamber substrate  3 . The vibrating plate  4  is a plate member, which is elongated in the Y-axis direction and extends substantially parallel to the X-Y plane, and is a member capable of elastically vibrating. 
     As illustrated in  FIGS. 2 and 3 , M piezoelectric elements PZ 1  corresponding on a one-to-one basis to the M pressure chambers CB 1  and M piezoelectric elements PZ 2  corresponding on a one-to-one basis to the M pressure chambers CB 2  are provided on the −Z side of the vibrating plate  4 . In the following description, a piezoelectric element PZ 1  and a piezoelectric element PZ 2  are collectively referred to as a piezoelectric element PZq. The piezoelectric element PZq is a passive element that is deformed in accordance with a change in the potential of the driving signal Com. In other words, the piezoelectric element PZq is an example of an energy conversion element that converts electrical energy of the driving signal Com into kinetic energy. Note that, in the following description, components and signals of the liquid ejecting head  1 , which correspond to the piezoelectric element PZq, are sometimes suffixed with “q”. 
       FIG. 4  is an enlarged sectional view of the vicinity of the piezoelectric element PZq. 
     As illustrated in  FIG. 4 , the piezoelectric element PZq is a layered structure in which a piezoelectric material ZMq is interposed between a lower electrode ZDq to which a given reference potential VBS is supplied and an upper electrode ZUq to which the driving signal Com is supplied. The piezoelectric element PZq is, for example, a portion in which the lower electrode ZDq, the upper electrode ZUq, and the piezoelectric material ZMq overlap each other as viewed in the −Z direction. Moreover, a pressure chamber CBq is provided in the +Z direction of the piezoelectric element PZq. 
     As described above, the piezoelectric element PZq is driven and deformed in accordance with the change in the potential of the driving signal Com. The vibrating plate  4  vibrates with the deformation of the piezoelectric element PZq. When the vibrating plate  4  vibrates, the pressure in the pressure chamber CBq changes. The change in the pressure in the pressure chamber CBq enables the ink filled in the pressure chamber CBq to be ejected from the nozzle N via a communication channel RRq and the nozzle channel RN. 
     As illustrated in  FIGS. 2 and 3 , the wiring substrate  8  is mounted on the surface of the vibrating plate  4  on the −Z side. The wiring substrate  8  is a part for electrically coupling the control device  90  and the liquid ejecting head  1 . As the wiring substrate  8 , for example, a flexible wiring substrate such as an FPC or FFC is suitably adopted. Here, “FPC” is an abbreviation for flexible printed circuit, and “FFC” is an abbreviation for flexible flat cable. A drive circuit  81  is mounted on the wiring substrate  8 . The drive circuit  81  is an electrical circuit that switches between supplying and not supplying the driving signal Com to the piezoelectric element PZq in accordance with control with the control signal SI. As illustrated in  FIG. 4 , the drive circuit  81  supplies the driving signal Com to the upper electrode ZUq of the piezoelectric element PZq via a wire  810 . 
     Note that, in the following description, the driving signal Com supplied to the piezoelectric element PZ 1  is sometimes referred to as a driving signal Com 1 , and the driving signal Com supplied to the piezoelectric element PZ 2  is sometimes referred to as a driving signal Com 2 . In the present embodiment, a case in which a waveform of the driving signal Com 1  supplied from the drive circuit  81  to the piezoelectric element PZ 1  corresponding to the nozzle N and a waveform of the driving signal Com 2  supplied from the drive circuit  81  to the piezoelectric element PZ 2  corresponding to the nozzle N are substantially identical when the ink is ejected from the nozzle N is assumed. Here, the term “substantially identical” includes not only a case of being exactly identical but also a case of being regarded as identical within a tolerance. 
     As illustrated in  FIGS. 2 and 3 , the accumulation chamber forming substrate  5  is provided on the −Z side of the communication plate  2 . The accumulation chamber forming substrate  5  is a member, which is elongated in the Y-axis direction, and has an ink channel formed therein. 
     Specifically, one supply channel RB 1  and one discharge channel RB 2  are formed in the accumulation chamber forming substrate  5 . Of the supply channel RB 1  and the discharge channel RB 2 , the supply channel RB 1  communicates with the supply channel RA 1  and is provided, in the −Z direction as viewed from the supply channel RA 1 , so as to extend in the Y-axis direction. The discharge channel RB 2  communicates with the discharge channel RA 2  and is provided, in the −Z direction as viewed from the discharge channel RA 2  and in the −X direction as viewed from the supply channel RB 1 , so as to extend in the Y-axis direction. 
     Further, an inlet port  51  that communicates with the supply channel RB 1  and a discharge port  52  that communicates with the discharge channel RB 2  are provided in the accumulation chamber forming substrate  5 . The ink is supplied from the liquid container  93  to the supply channel RB 1  via the inlet port  51 . The ink accumulated in the discharge channel RB 2  is collected via the discharge port  52 . 
     An opening  50  is provided in the accumulation chamber forming substrate  5 . The pressure chamber substrate  3 , the vibrating plate  4 , and the wiring substrate  8  are provided inside the opening  50 . 
     Note that the accumulation chamber forming substrate  5  is formed, for example, by injection molding of a resin material. Note that any known material and process can be adopted to manufacture the accumulation chamber forming substrate  5 . 
     In the present embodiment, the ink supplied from the liquid container  93  to the inlet port  51  flows to the supply channel RA 1  via the supply channel RB 1 . Then, a portion of the ink flowing to the supply channel RA 1  flows into the pressure chamber CB 1  via the coupling channel RX 1  and the coupling channel RK 1 . A portion of the ink flowing into the pressure chamber CB 1  flows into the pressure chamber CB 2  via the communication channel RR 1 , the nozzle channel RN, and the communication channel RR 2 . Then, a portion of the ink flowing into the pressure chamber CB 2  is discharged from the discharge port  52  via the coupling channel RK 2 , the coupling channel RX 2 , the discharge channel RA 2 , and the discharge channel RB 2 . 
     Note that, when the piezoelectric element PZ 1  is driven with the driving signal Com 1 , a portion of the ink filled in the pressure chamber CB 1  is ejected from the nozzle N via the communication channel RR 1  and the nozzle channel RN. When the piezoelectric element PZ 2  is driven with the driving signal Com 2 , a portion of the ink filled in the pressure chamber CB 2  is ejected from the nozzle N via the communication channel RR 2  and the nozzle channel RN. 
     As illustrated in  FIGS. 2 and 3 , the compliance sheet  61  is provided on the surface of the communication plate  2  on the +Z side so as to block the supply channel RA 1 , the coupling channel RX 1 , and the coupling channel RK 1 . The compliance sheet  61  is formed of an elastic material and absorbs a change in the pressure of the ink in the supply channel RA 1 , the coupling channel RX 1 , and the coupling channel RK 1 . Additionally, the compliance sheet  62  is provided on the surface of the communication plate  2  on the +Z side so as to block the discharge channel RA 2 , the coupling channel RX 2 , and the coupling channel RK 2 . The compliance sheet  62  is formed of an elastic material and absorbs a change in the pressure of the ink in the discharge channel RA 2 , the coupling channel RX 2 , and the coupling channel RK 2 . 
     As described above, the liquid ejecting head  1  according to the present embodiment causes the ink to circulate from the supply channel RA 1  to the discharge channel RA 2  via the circulation channel RJ. Therefore, in the present embodiment, even when a period during which the ink in the pressure chamber CBq is not ejected from the nozzle N exists, it is possible to prevent the ink from continuously remaining in the pressure chamber CBq, the nozzle channel RN, or the like. Thus, in the present embodiment, even when a period during which the ink in the pressure chamber CBq is not ejected from the nozzle N exists, it is possible to suppress an increase in viscosity of the ink in the pressure chamber CBq, thus making it possible to prevent an occurrence of an ejection abnormality that makes it difficult for the ink to be ejected from the nozzle N due to an increase in viscosity of the ink. 
     Moreover, the liquid ejecting head  1  according to the present embodiment is able to eject, from the nozzle N, the ink filled in the pressure chamber CB 1  and the ink filled in the pressure chamber CB 2 . Therefore, the liquid ejecting head  1  according to the present embodiment is able to increase the amount of the ink ejected from the nozzle N, for example, compared with an aspect in which ink filled in only one pressure chamber CBq is ejected from the nozzle N. 
     1.3. Shape of Nozzle Channel 
       FIG. 5  is an enlarged plan view of the vicinity of a nozzle channel RN[i], in which i is a natural number of 2 or more and M−1 or less.  FIG. 5  illustrates a communication channel RR 1 [ i− 1], a nozzle channel RN[i−1], a communication channel RR 2 [ i− 1], a communication channel RR 1 [ i ], the nozzle channel RN[i], a communication channel RR 2 [ i ], a communication channel RR 1 [ i+ 1], a nozzle channel RN[i+1], and a communication channel RR 2 [ i+ 1]. In the example of  FIG. 5 , the shape of each of the communication channel RR 1  and the communication channel RR 2  is a parallelogram in plan view in the −Z direction for convenience of processing of a monocrystalline substrate but may be a rectangle. 
     The nozzle channel RN has a first portion U 1 , a second portion U 2 , and a third portion U 3 . In  FIG. 5 , of the nozzle channel RN[i−1], the nozzle channel RN[i], and the nozzle channel RN[i+1], the first portion U 1 , the second portion U 2 , and the third portion U 3  of the nozzle channel RN[i−1] are given reference numerals to avoid complication of the drawing. The first portion U 1  extends in the −X direction and communicates with the communication channel RR 1 . The second portion U 2  extends in the V 1  direction and communicates with the first portion U 1 . The third portion U 3  extends in the −X direction and communicates with the second portion U 2  and the communication channel RR 2 . The V 1  direction crosses the −X direction and is orthogonal to the −Z direction. Angle θ 1  formed between the −X direction and the V 1  direction is larger than 0° and smaller than 90°. 
     The nozzle N is provided in the second portion U 2 . The nozzle N is typically provided at a substantially central position of the second portion U 2 . For example, a distance from the nozzle N to a wall surface HU 2   a  in the V 2  direction is substantially identical to a distance from the nozzle N to a wall surface HU 2   b  in the direction opposite to the V 2  direction. Moreover, for example, a distance from the nozzle N to a boundary B 12  between the first portion U 1  and the second portion U 2  in the V 1  direction is substantially identical to a distance from the nozzle N to a boundary B 23  between the second portion U 2  and the third portion U 3  in the V 1  direction. Here, the term “substantially central position” includes not only a case of being strictly the center but also a case of being regarded as the center within a tolerance. The V 2  direction is a direction on the −Y side of two directions vertical to the V 1  direction and the −Z direction. 
     As illustrated in  FIG. 5 , as viewed in the Z-axis direction, the first portion U 1  has a wall surface HU 1   a  on the −Y side and a wall surface HU 1   b  on the +Y side, and the second portion U 2  has the wall surface HU 2   a  on the V 2  side and the wall surface HU 2   b  on the side opposite to the V 2  direction. The third portion U 3  as viewed in the Z-axis direction has a wall surface HU 3   a  on the −Y side and a wall surface HU 3   b  on the +Y side. 
     Angle θ 1  is also able to be expressed as an angle formed by a vector normal to the wall surface HU 1   b  of the first portion U 1  and oriented to the wall surface HU 1   a  and a vector normal to the wall surface HU 2   b  of the second portion U 2  and oriented to the wall surface HU 2   a . The V 1  direction is also able to be expressed as a direction rotated clockwise by angle θ 1  from the −X direction as viewed in the −Z direction. Angle θ 1  is larger than 10° and smaller than 50°. Further, angle θ 1  is larger than 20° and smaller than 40°. Angle θ 1  is typically 30°. 
     In the present embodiment, the first portion U 1 , the second portion U 2 , and the third portion U 3  are substantially equal to each other in channel width. Here, the channel width is a dimension of a channel in a direction vertical to a direction in which the channel extends. The direction vertical to the direction in which the channel extends may be a horizontal direction or may be a vertical direction, that is, the Z-axis direction. In the following description, the channel width is a dimension of the channel in the horizontal direction which is assumed to be the direction vertical to the direction in which the channel extends. As illustrated in  FIG. 5 , channel width w 1  of the first portion U 1  in the −Y direction, channel width w 2  of the second portion U 2  in the V 2  direction, and channel width w 3  of the third portion U 3  in the −Y direction are substantially equal to each other. The term “substantially equal” includes not only a case of being exactly equal but also a case of being regarded as equal within a tolerance. 
     In the present embodiment, channel length L 2  of the second portion U 2  is shorter than channel length L 1  of the first portion U 1  and channel length L 3  of the third portion U 3 . Here, the channel length is a dimension in the direction in which the channel extends. Further, channel length L 1  and channel length L 3  are substantially equal to each other. 
     A portion of the communication channel RR 2  overlaps and the other portion does not overlap the communication channel RR 1  corresponding to the communication channel RR 2  as viewed in the −X direction. In the example of  FIG. 5 , a portion Pa 1  of the communication channel RR 2 [ i+ 1] in the −X direction does not overlap the communication channel RR 1 [ i+ 1], and a portion Pa 2  of the communication channel RR 2 [ i+ 1] in the −X direction overlaps the communication channel RR 1 [ i+ 1]. 
       FIG. 6  is an enlarged plan view of the vicinity of a pressure chamber CB 1 [ i ] and a pressure chamber CB 2 [ i ].  FIG. 6  illustrates a pressure chamber CB 1 [ i −1], a pressure chamber CB 2 [ i− 1], the pressure chamber CB 1 [ i ], the pressure chamber CB 2 [ i ], a pressure chamber CB 1 [ i+ 1], and a pressure chamber CB 2 [ i+ 1]. 
     A portion of the pressure chamber CB 2  overlaps and the other portion does not overlap the pressure chamber CB 1  corresponding to the pressure chamber CB 2  as viewed in the −X direction. In the example of  FIG. 6 , a portion Pa 3  of the pressure chamber CB 2 [ i− 1] in the −X direction does not overlap the pressure chamber CB 1 [ i −1], and a portion Pa 4  of the pressure chamber CB 2 [ i− 1] in the −X direction overlaps the pressure chamber CB 1 [ i −1]. 
     1.4 Conclusion of Embodiment 
     As described above, the liquid ejecting head  1  according to the present embodiment includes the pressure chamber CB 1  that extends in the −X direction and applies pressure to the ink, the pressure chamber CB 2  that extends in the −X direction and applies pressure to the ink, the nozzle channel RN that communicates with the nozzle N for ejecting the ink, the communication channel RR 1  that extends in the −Z direction and enables the pressure chamber CB 1  and the nozzle channel RN to communicate with each other, and the communication channel RR 2  that extends in the −Z direction and enables the pressure chamber CB 2  and the nozzle channel RN to communicate with each other, in which the nozzle channel RN includes the first portion U 1  that extends in the −X direction and communicates with the communication channel RR 1  and the second portion U 2  that extends in the V 1  direction crossing the −X direction and the −Z direction and communicates with at least the first portion U 1 , and angle θ 1  formed between the −X direction and the V 1  direction is larger than 0° and smaller than 90°. 
     Since higher resolution generally results in a reduction in width of a partition between nozzle channels RN, so-called structural crosstalk by which a change in internal pressure of a certain nozzle channel RN has an influence on ink ejection of a nozzle channel RN adjacent to the certain nozzle channel RN occurs. In the liquid ejecting head  1  according to the present embodiment, when a partition of the second portion U 2  is inclined relative to a partition of the first portion U 1  by angle θ 1 , the partition of the first portion U 1  and the partition of the second portion U 2  form a shape as in a so-called truss structure. Thus, in the liquid ejecting head  1  according to the present embodiment, strength of a partition between nozzle channels RN is improved compared with an aspect in which angle θ 1  is 0°. When the partition of the second portion U 2  is inclined relative to the partition of the first portion U 1  by angle θ 1 , the flow rate of the ink flowing in the nozzle channel RN is temporarily reduced particularly in the boundary B 12  between the first portion U 1  and the second portion U 2 . Therefore, a change itself in internal pressure of a certain nozzle channel RN is also reduced. As a result, it is possible to suppress an occurrence of structural crosstalk. Suppression of an occurrence of structural crosstalk enables suppression of a deterioration in quality of an image formed on the surface of the medium PP. 
     Note that, in the present embodiment, the pressure chamber CB 1  is an example of “a first pressure chamber”, the pressure chamber CB 2  is an example of “a second pressure chamber”, the communication channel RR 1  is an example of “a first communication channel”, the communication channel RR 2  is an example of “a second communication channel”, the ink is an example of “a liquid”, the +X direction is an example of “a first direction”, the −Z direction is an example of “a second direction”, and the V 1  direction is an example of “a third direction”. 
     Moreover, in the liquid ejecting head  1  according to the present embodiment, the nozzle channel RN may further include the third portion U 3  that extends in the −X direction and enables the second portion U 2  and the communication channel RR 2  to communicate with each other. 
     Since the third portion U 3  extends in the −X direction and the second portion U 2  extends in the V 1  direction, the partition of the second portion U 2  is also inclined relative to a partition of the third portion U 3  by angle θ 1 . Thus, such a relationship between the second portion U 2  and the third portion U 3  is also able to achieve improvement of partition strength and a reduction in flow rate similarly to the aforementioned relationship between the first portion U 1  and the second portion U 2 . Accordingly, the liquid ejecting head  1  according to the present embodiment is able to suppress an occurrence of structural crosstalk compared with an aspect in which the second portion U 2  is not inclined relative to the third portion U 3 , in other words, the aspect in which angle θ 1  is 0°. 
     Moreover, in the liquid ejecting head  1  according to the present embodiment, channel length L 2  may be shorter than channel length L 1  and channel length L 3 . 
     Rigidity of an object generally has a feature of monotonously increasing when the dimension of the object is reduced. Since channel length L 2  is shorter than channel length L 1  and channel length L 3 , rigidity of the partition of the second portion U 2  is greater than rigidity of the partition of the first portion U 1  and rigidity of the partition of the third partition U 3 . Additionally, when channel length L 2  is short, a reduction in flow rate in the boundary B 12  between the first portion U 1  and the second portion U 2  and a reduction in flow rate in the boundary B 23  between the second portion U 2  and the third portion U 3  are achieved in a short time, thus making it possible to continuously reduce the flow rate of the ink in the entire second portion U 2 . As a result, it is possible to suppress an occurrence of structural crosstalk compared with an aspect in which the channel length L 2  is identical to channel length L 1  and channel length L 3 . 
     Moreover, in the liquid ejecting head  1  according to the present embodiment, channel length L 1  and channel length L 3  may be substantially equal to each other. 
     Thus, according to the present embodiment, when the nozzle N communicates with the nozzle channel RN at a substantially central position, the length of an ink channel that extends from the pressure chamber CB 1  to the nozzle N via the communication channel RR 1  and the nozzle channel RN is able to be substantially identical to the length of an ink channel that extends from the pressure chamber CB 2  to the nozzle N via the communication channel RR 2  and the nozzle channel RN. Thereby, according to the present embodiment, it is possible to simplify control for ejecting the ink filled in the pressure chamber CB 1  from the nozzle N and control for ejecting the ink filled in the pressure chamber CB 2  from the nozzle N, for example, compared with an aspect in which channel length L 1  and channel length L 3  differ from each other. 
     Moreover, in the liquid ejecting head  1  according to the present embodiment, angle θ 1  between the −X direction and the V 1  direction may be larger than 10° and smaller than 50°. 
     Thus, the liquid ejecting head  1  according to the present embodiment is able to improve strength of a partition between nozzle channels RN and suppress an occurrence of structural crosstalk compared with the aspect in which angle θ 1  is 0°. 
     In an aspect in which angle θ 1  is 90°, air bubbles readily remain in the vicinity of a portion in which the wall surface HU 1   b  and the wall surface HU 2   b  are coupled compared with the liquid ejecting head  1  according to the present embodiment. In a case in which air bubbles remain in the circulation channel such as the nozzle channel RN, even when the piezoelectric element PZq is driven with the driving signal Com, for example, due to air bubbles absorbing the pressure applied from the piezoelectric element PZq for pushing out the ink, a so-called ejection abnormality that makes it difficult for the ink to be ejected from the nozzle N occurs. When an ejection abnormality occurs, the quality of an image formed on the medium PP is deteriorated. On the other hand, in the liquid ejecting head  1  according to the present embodiment, since air bubbles are difficult to remain, it is possible to suppress a deterioration in quality of an image formed on the medium PP compared with an aspect in which angle θ 1  is 90°. 
     Moreover, in the liquid ejecting head  1  according to the present embodiment, a portion of the communication channel RR 2  may overlap and the other portion may not overlap the communication channel RR 1  corresponding to the communication channel RR 2  as viewed in the −X direction. 
     In an aspect in which the communication channel RR 2  does not overlap the entire communication channel RR 1  as viewed in the −X direction, the width of the second portion U 2  that extends in the V 1  direction is widened or angle θ 1  increases (close to 90°). In the former case, the liquid ejecting head  1  increases in size in the X-axis direction and the Y-axis direction. In the latter case, with the increase in angle θ 1 , a distance between partitions of second portions U 2  of nozzle channels RN that are adjacent to each other is reduced, and therefore, an influence of structural crosstalk becomes significant, which may cancel the effect of reducing structural crosstalk obtained by improvement of partition strength and by a reduction in flow rate. As a result, the present embodiment is able to achieve the effect of preventing a size increase and reducing structural crosstalk compared with an aspect in which the communication channel RR 2  does not overlap the entire communication channel RR 1  as viewed in the −X direction. 
     Moreover, in the liquid ejecting head  1  according to the present embodiment, a portion of the pressure chamber CB 2  may overlap and the other portion may not overlap the pressure chamber CB 1  as viewed in the −X direction. 
     Therefore, the shape of the ink channel that extends from the pressure chamber CB 1  to the nozzle N via the communication channel RR 1  and the nozzle channel RN is able to be substantially identical to the shape of the ink channel that extends from the pressure chamber CB 2  to the nozzle N via the communication channel RR 2  and the nozzle channel RN. Thereby, according to the present embodiment, it is possible to simplify control for ejecting the ink filled in the pressure chamber CB 1  from the nozzle N and control for ejecting the ink filled in the pressure chamber CB 2  from the nozzle N, for example, compared with an aspect in which the pressure chamber CB 2  overlaps the entire pressure chamber CB 1  as viewed in the −X direction. 
     Moreover, in the liquid ejecting head  1  according to the present embodiment, the nozzle N may be provided in the second portion U 2 . The nozzle N is typically provided at a substantially central position of the second portion U 2 . 
     According to an aspect in which the nozzle N is provided at the substantially central position of the second portion U 2 , the shape of the ink channel that extends from the pressure chamber CB 1  to the nozzle N via the communication channel RR 1  and the nozzle channel RN is able to be substantially identical to the shape of the ink channel that extends from the pressure chamber CB 2  to the nozzle N via the communication channel RR 2  and the nozzle channel RN. Thereby, according to the present embodiment, it is possible to simplify control for ejecting the ink filled in the pressure chamber CB 1  from the nozzle N and control for ejecting the ink filled in the pressure chamber CB 2  from the nozzle N, for example, compared with an aspect in which the nozzle N communicates with the nozzle channel RN at a position different from the central position of the nozzle channel RN. 
     Note that, although the first portion U 1  is described in the present embodiment as a portion that communicates with the communication channel RR 1  on the supply side, the first portion U 1  may be considered as a portion that communicates with the communication channel RR 2  on the discharge side. In this case, in the present embodiment, the third portion U 3  communicates with the communication channel on the supply side. 
     Moreover, the liquid ejecting head  1  according to the present embodiment may further include the pressure chamber substrate  3  in which the pressure chamber CB 1  and the pressure chamber CB 2  are provided, the communication plate  2  in which the nozzle channel RN, the communication channel RR 1 , and the communication channel RR 2  are provided, and the nozzle substrate  60  in which the nozzle N is provided. 
     Therefore, according to the present embodiment, it is possible to manufacture the pressure chamber CB 1 , the pressure chamber CB 2 , the nozzle channel RN, the communication channel RR 1 , the communication channel RR 2 , and the nozzle N by using a semiconductor manufacturing technique. Thus, according to the present embodiment, it is possible to achieve miniaturization and densification of the pressure chamber CB 1 , the pressure chamber CB 2 , the nozzle channel RN, the communication channel RR 1 , the communication channel RR 2 , and the nozzle N. 
     Moreover, the liquid ejecting head  1  according to the present embodiment may include the piezoelectric element PZ 1  that applies pressure to the ink in the pressure chamber CB 1  in response to supply of the driving signal Com 1  and the piezoelectric element PZ 2  that applies pressure to the ink in the pressure chamber CB 2  in response to supply of the driving signal Com 2 . 
     Therefore, according to the present embodiment, it is possible to increase the amount of the ink ejected from the nozzle N compared with an aspect in which only the piezoelectric element PZq that applies pressure to the ink in one pressure chamber CBq is provided. 
     Note that, in the present embodiment, the piezoelectric element PZ 1  is an example of “a first element”, the piezoelectric element PZ 2  is an example of “a second element”, the driving signal Com 1  is an example of “a first driving signal”, and the driving signal Com 2  is an example of “a second driving signal”. 
     Moreover, in the liquid ejecting head  1  according to the present embodiment, the waveform of the driving signal Com 1  and the waveform of the driving signal Com 2  may be substantially identical. 
     Therefore, according to the present embodiment, it is possible to simplify control for ejecting the ink filled in the pressure chamber CB 1  from the nozzle N and control for ejecting the ink filled in the pressure chamber CB 2  from the nozzle N compared with an aspect in which the waveform of the driving signal Com  1  differs from the waveform of the driving signal Com 2 . 
     2. Modified Examples 
     Each aspect exemplified above can be variously modified. Specific modified aspects will be exemplified below. Any two or more aspects selected from the following examples can be appropriately combined as long as the aspects do not contradict each other. 
     2.1. First Modified Example 
     Although an aspect in which channel width w 1 , channel width w 2 , and channel width w 3  are all substantially equal is exemplified in the embodiment described above, the disclosure is not limited to the aspect. For example, channel width w 2  may be narrower than channel width w 1  and channel width w 3 . 
       FIG. 7  is an enlarged plan view of the vicinity of the nozzle channel RN[i] according to a first modified example. A liquid ejecting head  1 A according to the first modified example is similar in configuration to the liquid ejecting head  1  except that a communication plate  2 A is provided instead of the communication plate  2 . 
     As illustrated in  FIG. 7 , a nozzle channel RNA provided in the communication plate  2 A has a first portion U 1 A, a second portion U 2 A, and a third portion U 3 A. The second portion U 2 A extends in the V 3  direction. The V 3  direction crosses the −X direction and is orthogonal to the −Z direction. Angle θ 2  formed between the −X direction and the V 3  direction is larger than 0° and smaller than 90°. Channel width w 2 A of the second portion U 2 A is narrower than channel width w 1 A of the first portion U 1 A and channel width w 3 A of the third portion U 3 A. 
     As described above, in the liquid ejecting head  1 A according to the first modified example, channel width w 2 A is narrower than channel width w 1 A and channel width w 3 A. Therefore, the flow rate of the ink in the second portion U 2 A is higher than the flow rate of the ink in the first portion U 1 A and the flow rate of the ink in the third portion U 3 A. Thus, the ink in the second portion U 2 A is able to flow before an increase in viscosity of the ink proceeds compared with the ink in the first portion U 1 A and the ink in the third portion U 3 A, and it is possible to prevent an occurrence of an ejection abnormality that makes it difficult for the ink to be ejected from the nozzle N due to an increase in viscosity of the ink. 
     Further, since channel width w 2 A is narrower than channel width w 1 A and channel width w 3 A, a partition of the second portion U 2 A is thicker than a partition of the first portion U 1 A and a partition of the third portion U 3 A. Thus, rigidity of the partition of the second portion U 2 A is greater than rigidity of the partition of the first portion U 1 A and rigidity of the partition of the third portion U 3 A. In the embodiment, by inclining the second portion U 2  relative to each of the first portion U 1  and the third portion U 3  by angle θ 1 , partition strength is improved and the flow rate is reduced to reduce structural crosstalk. On the other hand, in the first modified example, since channel width w 2 A is narrow as described above, the flow rate in the second portion U 2 A increases compared with that of the embodiment. However, partition strength is further improved compared with that of the embodiment, thus making it possible to reduce an occurrence of structural crosstalk similarly to the embodiment. 
     Note that, in the first modified example, channel width w 1 A is the width of the first portion U 1 A in the horizontal direction, channel width w 2 A is the width of the second portion U 2 A in the horizontal direction, and channel width w 3 A is the width of the third portion U 3 A in the horizontal direction, but there is no limitation thereto. For example, the channel width of the second portion U 2 A in the −Z direction may be narrower than the channel width of the first portion U 1 A in the −Z direction and the channel width of the third portion U 3 A in the −Z direction. 
     2.2. Second Modified Example 
     Although an aspect in which channel width w 1  and channel width w 3  are substantially equal to each other is exemplified in the embodiment and the first modified example described above, the disclosure is not limited to the aspect. For example, channel width w 3  may be narrower than channel width w 1 . 
       FIG. 8  is an enlarged plan view of the vicinity of a nozzle channel RN[i] according to a second modified example. A liquid ejecting head  1 B according to the second modified example is similar in configuration to the liquid ejecting head  1  except that a communication plate  2 B is provided instead of the communication plate  2 . 
     As illustrated in  FIG. 8 , a nozzle channel RNB provided in the communication plate  2 B has a first portion U 1 B, a second portion U 2 B, and a third portion U 3 B. The second portion U 2 B extends in the V 4  direction. The V 4  direction crosses the −X direction and is orthogonal to the −Z direction. Angle θ 3  formed between the −X direction and the V 4  direction is larger than 0° and smaller than 90°. Channel width w 3 B of the third portion U 3 B is narrower than channel width w 1 B of the first portion U 1 B. 
     As described above, in the liquid ejecting head  1 B according to the second modified example, channel width w 3 B is narrower than channel width w 1 B. Since channel width w 3 B is narrower than channel width w 1 B, the flow rate of the ink in the third portion U 3 B is higher than the flow rate of the ink in the first portion U 1 B. Thus, the liquid ejecting head  1 B according to the second modified example is able to smoothly discharge air bubbles in the ink compared with an aspect in which channel width w 3 B and channel width w 1 B are identical. Additionally, since it is possible to thicken a partition of the third portion U 3 B, structural crosstalk is able to be further suppressed. 
     Note that, in the second modified example, channel width w 3 B may be narrower than channel width w 2 B, may be identical to channel width w 2 B, or may be wider than channel width w 2 B. 
     2.3. Third Modified Example 
     Although an aspect in which a portion of the pressure chamber CB 2  overlaps and the other portion does not overlap the pressure chamber CB 1  as viewed in the −X direction is exemplified in the embodiment, the first modified example, and the second modified example described above, the disclosure is not limited to the aspect. For example, the entire pressure chamber CB 2  may overlap the pressure chamber CB 1  as viewed in the −X direction. 
       FIG. 9  is an enlarged plan view of the vicinity of a pressure chamber CB 1 C[i] and a pressure chamber CB 2 C[i] according to a third modified example. A liquid ejecting head  1 C according to the third modified example is similar in configuration to the liquid ejecting head  1  except that a pressure chamber substrate  3 C is provided instead of the pressure chamber substrate  3  and that a communication plate  2 C is provided instead of the communication plate  2 . 
     As illustrated in  FIG. 9 , M pressure chambers CB 1 C corresponding on a one-to-one basis to the M nozzles N and M pressure chambers CB 2 C corresponding on a one-to-one basis to the M nozzles N are formed in the pressure chamber substrate  3 C. 
     As illustrated in  FIG. 9 , an entire pressure chamber CB 2 C overlaps a pressure chamber CB 1 C as viewed in the −X direction. In the example of  FIG. 9 , the X-coordinate of a wall surface of the pressure chamber CB 2 C[i] on the −Y side is substantially identical to the X-coordinate of a wall surface of the pressure chamber CB 1 C[i] on the −Y side. Additionally, the X-coordinate of a wall surface of the pressure chamber CB 2 C[i] on the +Y side is substantially identical to the X-coordinate of a wall surface of the pressure chamber CB 1 C[i] on the +Y side. 
     In the communication plate  2 C, M coupling channels RK 1 C corresponding on a one-to-one basis to the M nozzles N, M coupling channels RK 2 C corresponding on a one-to-one basis to the M nozzles N, M communication channels RR 1 C corresponding on a one-to-one basis to the M nozzles N, M communication channels RR 2 C corresponding on a one-to-one basis to the M nozzles N, and M nozzle channels RNC corresponding on a one-to-one basis to the M nozzles N are formed. 
     The nozzle channels RNC and the nozzle channels RN are identical in shape. Note that, for achieving a smooth flow of the ink, the nozzle channels RNC are positioned such that all openings of the communication channels RR 1 C and all openings of the communication channels RR 2 C in the −Z direction overlap the pressure chambers CB 1 C as viewed in the Z-axis direction. The coupling channels RK 1 C are positioned such that all openings of the coupling channels RK 1 C in the −Z direction overlap the pressure chambers CB 1 C as viewed in the Z-axis direction. The coupling channels RK 2 C are positioned such that all openings of the coupling channels RK 2 C in the −Z direction overlap the pressure chambers CB 2 C as viewed in the Z-axis direction. 
     As described above, in the liquid ejecting head  1 C according to the third modified example, the entire pressure chamber CB 2 C overlaps the pressure chamber CB 1 C as viewed in the −X direction. Thus, since the X-coordinate of the pressure chamber CB 1 C and the X-coordinate of the pressure chamber CB 2 C are substantially identical to each other, it is possible to easily manufacture the liquid ejecting head  1 C compared with an aspect in which the pressure chamber CB 2 C does not overlap at least a portion of the pressure chamber CB 1 C as viewed in the −X direction. 
     2.4. Fourth Modified Example 
     Although the nozzle channel RN has the first portion U 1 , the second portion U 2 , and the third portion U 3  in the embodiment and the first to third modified examples described above, there is no limitation thereto. For example, the nozzle channel RN may have only the first portion U 1  and the second portion U 2 . 
       FIG. 10  is an enlarged plan view of the vicinity of a nozzle channel RN[i] according to a fourth modified example. A liquid ejecting head  1 D according to the fourth modified example is similar in configuration to the liquid ejecting head  1  except that a communication plate  2 D is provided instead of the communication plate  2 . 
     As illustrated in  FIG. 10 , a nozzle channel RND provided in the communication plate  2 D has a first portion U 1 D and a second portion U 2 D. The first portion U 1 D extends in the −X direction and communicates with the communication channel RR 1 . The second portion U 2 D extends in the V 5  direction and communicates with the first portion U 1 D and the communication channel RR 2 . The V 5  direction crosses the −X direction and is orthogonal to the −Z direction. Angle  04  formed between the −X direction and the V 5  direction is larger than 0° and smaller than 90°. 
     As described above, in the liquid ejecting head  1 D according to the fourth modified example, the second portion U 2 D may communicate with the communication channel RR 2 . Also in the fourth modified example, a partition of the first portion U 1 D and a partition of the second portion U 2 D form a shape as in a so-called truss structure. Thus, the liquid ejecting head  1 D according to the fourth modified example is able to improve strength of a partition between nozzle channels RND and suppress an occurrence of structural crosstalk compared with an aspect in which angle θ 4  formed between the −X direction and the V 5  direction is 0°. Additionally, the direction in which the ink flows in the nozzle channel RND changes once, whereas the direction in which the ink flows in the nozzle channel RN changes twice. Accordingly, the fourth modified example is able to achieve a smooth flow of the ink compared with the embodiment. 
     Note that, although an aspect in which the first portion U 1 D that communicates with the communication channel RR 1  extends in the −X direction and the second portion U 2 D that communicates with the communication channel RR 2  extends in the V 5  direction is described here, the first portion U 1 D may extend in the V 5  direction and the second portion U 2 D may extend in the −X direction. 
     2.5. Fifth Modified Example 
     Although an aspect in which two piezoelectric elements PZq of the piezoelectric element PZ 1  and the piezoelectric element PZ 2  are provided so as to correspond to each of the nozzles N is exemplified in the embodiment and the first to fourth modified examples described above, the disclosure is not limited to the aspect. For example, one piezoelectric element PZ may be provided so as to correspond to each of the nozzles N. 
       FIG. 11  is an exploded perspective view of a liquid ejecting head  1 E according to a fifth modified example. 
     As illustrated in  FIG. 11 , the liquid ejecting head  1 E according to the fifth modified example differs from the liquid ejecting head  1  according to the embodiment in terms of including a nozzle substrate  60 E instead of the nozzle substrate  60 , including a communication plate  2 E instead of the communication plate  2 , including a pressure chamber substrate  3 E instead of the pressure chamber substrate  3 , and including a vibrating plate  4 E instead of the vibrating plate  4 . 
     Among these, the nozzle substrate  60 E differs from the nozzle substrate  60  according to the embodiment in terms of including a nozzle row Ln 1  and a nozzle row Ln 2  instead of the nozzle row Ln. Here, the nozzle row Ln 1  is a set of M 1  nozzles N that are provided so as to extend in the Y-axis direction. The nozzle row Ln 2  is a set of M 2  nozzles N that are provided so as to extend in the Y-axis direction at a position closer than the nozzle row Ln 1  to the discharge channel RA 2 . Here, values of M 1  and M 2  are natural numbers of 1 or more that satisfy M 1 +M 2 =M. Note that, in the present modified example, a case in which the value of M is a natural number of 2 or more is assumed. Moreover, in the following description, the nozzles N that form the nozzle row Ln 1  are sometimes referred to as nozzles N 1 , and the nozzles N that form the nozzle row Ln 2  are sometimes referred to as nozzles N 2 . 
     The communication plate  2 E differs from the communication plate  2  according to the embodiment in terms of including M 1  coupling channels RK 1  corresponding on a one-to-one basis to M 1  nozzles N 1 , M 2  coupling channels RK 2  corresponding on a one-to-one basis to M 2  nozzles N 2 , M 1  communication channels RR 1  corresponding on a one-to-one basis to the M 1  nozzles N 1 , and M 2  communication channels RR 2  corresponding on a one-to-one basis to the M 2  nozzles N 2  instead of the M coupling channels RK 1 , the M coupling channels RK 2 , the M communication channels RR 1 , and the M communication channels RR 2 . Further, the supply channel RA 1  that extends in the Y-axis direction and the discharge channel RA 2  that is provided, in the −X direction as viewed from the supply channel RA 1 , so as to extend in the Y-axis direction are formed in the communication plate  2 E, similarly to the communication plate  2 . 
     Moreover, the pressure chamber substrate  3 E differs from the pressure chamber substrate  3  according to the embodiment in that M 1  pressure chambers CB 1  corresponding on a one-to-one basis to the M 1  nozzles N 1  and M 2  pressure chambers CB 2  corresponding on a one-to-one basis to the M 2  nozzles N 2  are formed instead of the M pressure chambers CB 1  and the M pressure chambers CB 2 . 
     Moreover, the vibrating plate  4 E differs from the vibrating plate  4  according to the embodiment in that M 1  piezoelectric elements PZ 1  corresponding on a one-to-one basis to the M 1  nozzles N 1  and M 2  piezoelectric elements PZ 2  corresponding on a one-to-one basis to the M 2  nozzles N 2  are formed instead of the M piezoelectric elements PZ 1  and the M piezoelectric elements PZ 2 . 
       FIG. 12  is a plan view of the liquid ejecting head  1 E as viewed in the Z-axis direction. 
     In the fifth modified example, the liquid ejecting head  1 E includes M circulation channels RJ corresponding on a one-to-one basis to the M nozzles N provided in the nozzle substrates  60 E. In the following description, circulation channels RJ provided so as to correspond to the nozzles N 1  are sometimes referred to as circulation channels RJ 1 , and circulation channels RJ provided so as to correspond to the nozzles N 2  are sometimes referred to as circulation channels RJ 2 . That is, in the fifth modified example, M 1  circulation channels RJ 1  and M 2  circulation channels RJ 2  enable the supply channel RA 1  and the discharge channel RA 2  to communicate with each other. 
     In the fifth modified example, a circulation channel RJ 1  and a circulation channel RJ 2  are alternately arranged in the Y-axis direction. Moreover, in the fifth modified example, the M 1  circulation channels RJ 1  and the M 2  circulation channels RJ 2  are arranged such that a distance between the circulation channel RJ 1  and the circulation channel RJ 2  that are adjacent to each other in the Y-axis direction is distance dY. 
     As described above, the circulation channel RJ 1  has the pressure chamber CB 1 , and the circulation channel RJ 2  has the pressure chamber CB 2 . In the fifth modified example, as illustrated in  FIG. 12 , the pressure chamber CB 1  is provided at a position closer than a nozzle N 1  to the supply channel RA 1  as viewed in the Z-axis direction. The pressure chamber CB 2  is provided at a position closer than a nozzle N 2  to the discharge channel RA 2  as viewed in the Z-axis direction. As described above, the nozzle row Ln 1  to which the nozzles N 1  belong is provided on the +X side of the nozzle row Ln 2  to which the nozzles N 2  belong. Therefore, in the fifth modified example, the pressure chamber CB 1  is positioned on the +X side of the pressure chamber CB 2 . 
     In the fifth modified example, the circulation channel RJ is provided such that the width of the pressure chamber CBq in the Y-axis direction is width dCY and the width of a portion other than the pressure chamber CBq is width dRY or less. Further, in the fifth modified example, as an example, a case in which the M 1  circulation channels RJ 1  and the M 2  circulation channels RJ 2  are provided such that distance dY and width dCY satisfy dCY&gt;dY and distance dY and width dRY satisfy dRY&gt;dY is assumed. Note that, although an aspect in which distance dY and width dRY satisfy dY&gt;dRY is described in  FIG. 12  for simplification and easy understanding, distance dY and width dRY may satisfy dRY&gt;dY, or the width of at least some of the portion other than the pressure chamber CBq may be larger than distance dY. Further, in the fifth modified example, a case in which a distance from a nozzle N 1  to a nozzle N 2  adjacent thereto in the −Y direction and a distance from the nozzle N 2  to an adjacent nozzle N 1  in the −Y direction are substantially identical to each other as width dY is assumed. 
     As described with reference to  FIGS. 13 and 14 , in the fifth modified example, the circulation channel RJ 1  and the circulation channel RJ 2  that are adjacent to each other in the Y-axis direction hardly overlap each other in the Z-axis direction at any positions in the X-axis direction. Therefore, substantially no structural crosstalk occurs between the circulation channel RJ 1  and the circulation channel RJ 2 , and it is sufficient that only structural crosstalk between two circulation channels RJ 1  with the circulation channel RJ 2  therebetween or structural crosstalk between two circulation channels RJ 2  with the circulation channel RJ 1  therebetween be considered. Thus, a pitch at which circulation channels RJ are provided is able to be narrowed compared with an aspect in which the pressure chamber CB 1  and the pressure chamber CB 2  are provided at the same position in the X-axis direction. In addition, according to the fifth modified example, it is also possible to reduce channel resistance while narrowing the pitch at which circulation channels RJ are provided. Further, according to the fifth modified example, it is also possible to ensure capacities of the pressure chamber CB 1  and the pressure chamber CB 2  by increasing width dCY of the pressure chamber CB 1  and the pressure chamber CB 2  in the Y-axis direction while narrowing the pitch at which circulation channels RJ are provided. 
     Further, in the fifth modified example, the circulation channel RJ 1  includes a nozzle channel RNE 1 . The nozzle channel RNE 1  has a first portion U 1 E 1 , a second portion U 2 E 1 , and a third portion U 3 E 1 . The first portion U 1 E 1  extends in the −X direction and communicates with the communication channel RR 1 . The second portion U 2 E 1  extends in the V 6  direction and communicates with the first portion U 1 E 1 . The V 6  direction crosses the −X direction and is orthogonal to the −Z direction. Angle θ 5  formed between the −X direction and the V 6  direction is larger than 0° and smaller than 90°. The second portion U 2 E 1  communicates with the nozzle N 1 . The third portion U 3 E 1  extends in the −X direction and communicates with the second portion U 2 E 1  and a channel R 11 . The channel R 11  will be described later with reference to  FIG. 13 . 
     The circulation channel RJ 2  includes a nozzle channel RNE 2 . The nozzle channel RNE 2  has a first portion U 1 E 2 , a second portion U 2 E 2 , and a third portion U 3 E 2 . The first portion U 1 E 2  extends in the −X direction and communicates with the communication channel RR 2 . The second portion U 2 E 2  extends in the V 6  direction and communicates with the first portion U 1 E 2 . The second portion U 2 E 2  communicates with the nozzle N 2 . The third portion U 3 E 2  extends in the −X direction and communicates with the second portion U 2 E 2  and a channel R 21 . The channel R 21  will be described later with reference to  FIG. 14 . The X-coordinate of the center of the nozzle channel RNE 1  differs from the X-coordinate of the center of the nozzle channel RNE 2 . 
       FIG. 13  is a sectional view of the liquid ejecting head  1 E, which is taken parallel to the X-Z plane so as to pass through the circulation channel RJ 1 .  FIG. 14  is a sectional view of the liquid ejecting head  1 E, which is taken parallel to the X-Z plane so as to pass through the circulation channel RJ 2 . 
     As illustrated in  FIGS. 13 and 14 , in the fifth modified example, the communication plate  2 E includes a substrate  21  and a substrate  22 . Here, each of the substrate  21  and the substrate  22  is manufactured such that, for example, a silicon monocrystalline substrate is processed by using a semiconductor manufacturing technique such as etching. Note that any known material and process can be adopted to manufacture each of the substrate  21  and the substrate  22 . 
     As illustrated in  FIG. 13 , in the fifth modified example, the circulation channel RJ 1  includes the coupling channel RX 1 , the coupling channel RK 1 , the pressure chamber CB 1 , the communication channel RR 1 , the nozzle channel RNE 1 , the channel R 11 , a channel R 12 , a channel R 13 , a channel R 14 , a channel R 15 , and the coupling channel RX 2 . The coupling channel RX 1  communicates with the supply channel RA 1  and is formed in the substrate  21  and the substrate  22 . The coupling channel RK 1  communicates with the coupling channel RX 1  and is formed in the substrate  21  and the substrate  22 . The pressure chamber CB 1  communicates with the coupling channel RK 1  and is formed in the pressure chamber substrate  3 E. The communication channel RR 1  communicates with the pressure chamber CB 1  and is formed in the substrate  21  and the substrate  22 . The nozzle channel RNE 1  communicates with the communication channel RR 1  and the nozzle N 1  and is formed in the substrate  21 . The channel R 11  communicates with the nozzle channel RNE 1  and is formed in the substrate  22 . The channel R 12  communicates with the channel R 11  and is formed in the substrate  21 . The channel R 13  communicates with the channel R 12  and is formed in the nozzle substrate  60 E. The channel R 14  communicates with the channel R 13  and is formed in the substrate  21 . The channel R 15  communicates with the channel R 14  and is formed in the substrate  22 . The coupling channel RX 2  enables the channel R 15  and the discharge channel RA 2  to communicate with each other and is formed in the substrate  21  and the substrate  22 . 
     As illustrated in  FIG. 14 , in the fifth modified example, the circulation channel RJ 2  includes the coupling channel RX 2 , the coupling channel RK 2 , the pressure chamber CB 2 , the communication channel RR 2 , the nozzle channel RNE 2 , the channel R 21 , a channel R 22 , a channel R 23 , a channel R 24 , a channel R 25 , and the coupling channel RX 1 . The coupling channel RX 2  communicates with the discharge channel RA 2  and is formed in the substrate  21  and the substrate  22 . The coupling channel RK 2  communicates with the coupling channel RX 2  and is formed in the substrate  21  and the substrate  22 . The pressure chamber CB 2  communicates with the coupling channel RK 2  and is formed in the pressure chamber substrate  3 E. The communication channel RR 2  communicates with the pressure chamber CB 2  and is formed in the substrate  21  and the substrate  22 . The nozzle channel RNE 2  communicates with the communication channel RR 2  and the nozzle N 2  and is formed in the substrate  21 . The channel R 21  communicates with the nozzle channel RNE 2  and is formed in the substrate  22 . The channel R 22  communicates with the channel R 21  and is formed in the substrate  21 . The channel R 23  communicates with the channel R 22  and is formed in the nozzle substrate  60 E. The channel R 24  communicates with the channel R 23  and is formed in the substrate  21 . The channel R 25  communicates with the channel R 24  and is formed in the substrate  22 . The coupling channel RX 1  enables the channel R 25  and the supply channel RA 1  to communicate with each other and is formed in the substrate  21  and the substrate  22 . 
     According to the fifth modified example, a partition of the second portion U 2 E 1  is inclined relative to a partition of the first portion U 1 E 1  by angle θ 5 . The partition of the second portion U 2 E 1  is also inclined relative to a partition of the third portion U 3 E 1  by angle θ 5 . A partition of the second portion U 2 E 2  is inclined relative to a partition of the first portion U 1 E 2  by angle θ 5 . The partition of the second portion U 2 E 2  is also inclined relative to a partition of the third portion U 3 E 2  by angle θ 5 . Accordingly, according to the fifth modified example, it is possible to improve partition strength and reduce the flow rate of the ink, thus making it possible to suppress an occurrence of structural crosstalk compared with an aspect in which angle θ 5  formed between the −X direction and the V 6  direction is 0°. 
     2.6. Sixth Modified Example 
     In the fifth modified example described above, the X-coordinate of the center of the nozzle channel RNE 1  and the X-coordinate of the center of the nozzle channel RNE 2  differ from each other but may be identical to each other. 
       FIG. 15  is an exploded perspective view of a liquid ejecting head  1 F according to a sixth modified example. 
     As illustrated in  FIG. 15 , the liquid ejecting head  1 F according to the sixth modified example differs from the liquid ejecting head  1 E according to the fifth modified example in terms of including a nozzle substrate  60 F instead of the nozzle substrate  60 E and including a communication plate  2 F instead of the communication plate  2 E. 
     The nozzle substrate  60 F differs from the nozzle substrate  60 E according to the fifth modified example in that a distance from a nozzle N 1  to a nozzle N 2  adjacent thereto and a distance from the nozzle N 2  to an adjacent nozzle N 1  in the −Y direction differ from each other. 
     The communication plate  2 F differs from the communication plate  2 E according to the fifth modified example in that the shape of a nozzle channel RNF 1  provided in the communication plate  2 F differs from the shape of the nozzle channel RNE 1  provided in the communication plate  2 E according to the fifth modified example and that the shape of a nozzle channel RNF 2  provided in the communication plate  2 F differs from the shape of the nozzle channel RNE 2  provided in the communication plate  2 E according to the fifth modified example. 
       FIG. 16  is a plan view of the liquid ejecting head  1 F as viewed in the Z-axis direction. 
     Also in the sixth modified example, similarly to the fifth modified example, the circulation channel RJ is provided such that the width of the pressure chamber CBq in the Y-axis direction is width dCY and the width of a portion other than the pressure chamber CBq is width dRY or less. In the sixth modified example, as an example, a case in which the M 1  circulation channels RJ 1  and the M 2  circulation channels RJ 2  are provided such that distance dY and width dCY satisfy dCY&gt;dY and distance dY and width dRY satisfy dRY&gt;dY is assumed. Note that, although  FIG. 16  describes, for simplification and easy understanding, as if distance dY and width dRY satisfied dY&gt;dRY, distance dY and width dRY actually satisfy dRY&gt;dY, and the width of at least some of the portion other than the pressure chamber CBq may be larger than distance dY. Further, in the sixth modified example, distance d 1 Y from a nozzle N 1  to a nozzle N 2  adjacent thereto and distance d 2 Y from the nozzle N 2  to an adjacent nozzle N 1  in the −Y direction differ from each other. 
     Also in the sixth modified example, similarly to the fifth modified example, the circulation channel RJ 1  and the circulation channel RJ 2  that are adjacent to each other in the Y-axis direction hardly overlap each other in the Z-axis direction at any positions in the X-axis direction. Therefore, substantially no structural crosstalk occurs between the circulation channel RJ 1  and the circulation channel RJ 2 , and it is sufficient that only structural crosstalk between two circulation channels RJ 1  with the circulation channel RJ 2  therebetween or structural crosstalk between two circulation channels RJ 2  with the circulation channel RJ 1  therebetween be considered. Thus, a pitch at which circulation channels RJ are provided is able to be narrowed compared with an aspect in which the pressure chamber CB 1  and the pressure chamber CB 2  are provided at the same position in the X-axis direction. In addition, according to the sixth modified example, it is also possible to reduce channel resistance or the like while narrowing the pitch at which circulation channels RJ are provided. Further, according to the sixth modified example, it is also possible to ensure capacities of the pressure chamber CB 1  and the pressure chamber CB 2  by increasing width dCY of the pressure chamber CB 1  and the pressure chamber CB 2  in the Y-axis direction while narrowing the pitch at which circulation channels RJ are provided. 
     Further, in the sixth modified example, the circulation channel RJ 1  includes the nozzle channel RNF 1 . The nozzle channel RNF 1  has a first portion U 1 F 1 , a second portion U 2 F 1 , and a third portion U 3 F 1 . The first portion U 1 F 1  extends in the −X direction and communicates with the communication channel RR 1 . The first portion U 1 F 1  communicates with the nozzle N 1 . The second portion U 2 F 1  extends in the V 7  direction and communicates with the first portion U 1 F 1 . The V 7  direction crosses the −X direction and is orthogonal to the −Z direction. Angle θ 6  formed between the −X direction and the V 7  direction is larger than 0° and smaller than 90°. The third portion U 3 F 1  extends in the −X direction and communicates with the second portion U 2 F 1  and the channel R 11 . 
     The circulation channel RJ 2  includes the nozzle channel RNF 2 . The nozzle channel RNF 2  has a first portion U 1 F 2 , a second portion U 2 F 2 , and a third portion U 3 F 2 . The first portion U 1 F 2  extends in the −X direction and communicates with the communication channel RR 2 . The second portion U 2 F 2  extends in the V 7  direction and communicates with the first portion U 1 F 2 . The second portion U 2 F 2  communicates with the nozzle N 2 . The third portion U 3 F 2  extends in the −X direction and communicates with the second portion U 2 F 2  and the channel R 21 . The X-coordinate of the center of the nozzle channel RNF 1  and the X-coordinate of the center of the nozzle channel RNF 2  are substantially identical to each other. 
     According to the sixth modified example, a partition of the second portion U 2 F 1  is inclined relative to a partition of the first portion U 1 F 1  by angle θ 6 . The partition of the second portion U 2 F 1  is also inclined relative to a partition of the third portion U 3 F 1  by angle θ 6 . A partition of the second portion U 2 F 2  is inclined relative to a partition of the first portion U 1 F 2  by angle θ 6 . The partition of the second portion U 2 F 2  is also inclined relative to a partition of the third portion U 3 F 2  by angle θ 6 . Accordingly, according to the sixth modified example, it is possible to improve partition strength and reduce the flow rate of the ink, thus making it possible to suppress an occurrence of structural crosstalk compared with an aspect in which angle θ 6  formed between the −X direction and the V 7  direction is 0°. 
     Further, in the sixth modified example, since the X-coordinate of the center of the nozzle channel RNF 1  and the X-coordinate of the center of the nozzle channel RNF 2  are substantially equal, thickness of a partition between the nozzle channel RNF 1  and the nozzle channel RNF 2  is able to be substantially fixed. On the other hand, in the fifth modified example, since the X-coordinate of the center of the nozzle channel RNF 1  and the X-coordinate of the center of the nozzle channel RNF 2  differ from each other, the thickness of the partition between the nozzle channel RNF 1  and the nozzle channel RNF 2  is not fixed, and there is a portion whose thickness is small like thickness dmY illustrated in  FIG. 12  compared with that of the other portion. In the portion whose thickness is small, rigidity is small, and structural crosstalk is likely to occur compared with the other portion. In the sixth modified example, a portion whose thickness is smaller than the other portion is less likely to be generated, thus making it possible to suppress an occurrence of structural crosstalk compared with the fifth modified example. 
     2.7. Seventh Modified Example 
     In the embodiment and the first to fourth modified examples described above, the ink filled in the pressure chamber CB 1  and the ink filled in the pressure chamber CB 2  are ejected from the nozzle N, but ink filled in only one pressure chamber CBq may be ejected from the nozzle N. 
       FIG. 17  is an exploded perspective view of a liquid ejecting head  1 G according to a seventh modified example. 
     As illustrated in  FIG. 17 , the liquid ejecting head  1 G according to the seventh modified example differs from the liquid ejecting head  1  according to the embodiment in terms of including a communication plate  2 G instead of the communication plate  2 , including a pressure chamber substrate  3 G instead of the pressure chamber substrate  3 , and including a vibrating plate  4 G instead of the vibrating plate  4 . 
     The communication plate  2 G differs from the communication plate  2  according to the embodiment in terms of including neither the M coupling channels RK 2  nor the M communication channels RR 2  among the M coupling channels RK 1 , the M coupling channels RK 2 , the M communication channels RR 1 , and the M communication channels RR 2 . 
     The pressure chamber substrate  3 G differs from the pressure chamber substrate  3  according to the embodiment in terms of including no M pressure chambers CB 2  among the M pressure chambers CB 1  and the M pressure chambers CB 2 . 
     The vibrating plate  4 G differs from the vibrating plate  4  according to the embodiment in terms of including no M piezoelectric elements PZ 2  among the M piezoelectric elements PZ 1  and the M piezoelectric elements PZ 2 . 
     In the communication plate  2 G, one supply channel RA 1 , one discharge channel RA 2 , the M coupling channels RK 1 , and the M communication channels RR 1  are formed. An ink channel that enables the supply channel RA 1  and the discharge channel RA 2  to communicate with each other in the seventh modified example is referred to as a circulation channel RJG. 
       FIG. 18  is a sectional view of the liquid ejecting head  1 G, which is taken parallel to the X-Z plane so as to pass through the circulation channel RJG. 
     As illustrated in  FIG. 18 , in the seventh modified example, the communication plate  2 G includes the substrate  21  and the substrate  22 . Here, each of the substrate  21  and the substrate  22  is manufactured such that, for example, a silicon monocrystalline substrate is processed by using a semiconductor manufacturing technique such as etching. Note that any known material and process can be adopted to manufacture each of the substrate  21  and the substrate  22 . 
     As illustrated in  FIG. 18 , in the seventh modified example, the circulation channel RJG includes the coupling channel RX 1 , the coupling channel RK 1 , the pressure chamber CB 1 , the communication channel RR 1 , a nozzle channel RNG, the channel R 11 , the channel R 12 , the channel R 13 , the channel R 14 , the channel R 15 , and the coupling channel RX 2 . The coupling channel RX 1  communicates with the supply channel RA 1  and is formed in the substrate  21  and the substrate  22 . The coupling channel RK 1  communicates with the coupling channel RX 1  and is formed in the substrate  21  and the substrate  22 . The pressure chamber CB 1  communicates with the coupling channel RK 1  and is formed in the pressure chamber substrate  3 . The communication channel RR 1  communicates with the pressure chamber CB 1  and is formed in the substrate  21  and substrate  22 . The nozzle channel RNG communicates with the communication channel RR 1  and the nozzle N and is formed in the substrate  21 . The channel R 11  communicates with the nozzle channel RNG and is formed in the substrate  22 . The channel R 12  communicates with the channel R 11  and is formed in the substrate  21 . The channel R 13  communicates with the channel R 12  and is formed in a nozzle substrate  60 G. The channel R 14  communicates with the channel R 13  and is formed in the substrate  21 . The channel R 15  communicates with the channel R 14  and is formed in the substrate  22 . The coupling channel RX 2  enables the channel R 15  and the discharge channel RA 2  to communicate with each other and is formed in the substrate  21  and the substrate  22 . 
       FIG. 19  is an enlarged plan view of the vicinity of the nozzle channel RNG[i]. 
     The nozzle channel RNG has a first portion U 1 G, a second portion U 2 G, and a third portion U 3 G. The first portion U 1 G extends in the −X direction and communicates with the communication channel RR 1 . The second portion U 2 G extends in the V 8  direction and communicates with the first portion U 1 G. The V 8  direction crosses the −X direction and is orthogonal to the −Z direction. Angle θ 7  formed between the −X direction and the V 8  direction is larger than 0° and smaller than 90°. The second portion U 2 G communicates with the nozzle N. The third portion U 3 G extends in the −X direction and communicates with the second portion U 2 G and the channel R 11 . 
     Also in the seventh modified example, a partition of the second portion U 2 G is inclined relative to a partition of the first portion U 1 G by angle θ 7 . The partition of the second portion U 2 G is inclined relative to a partition of the third portion U 3 G by angle θ 7 . Accordingly, according to the seventh modified example, it is possible to improve strength of a partition between nozzle channels RNG and suppress an occurrence of structural crosstalk compared with an aspect in which angle θ 7  formed between the −X direction and the V 8  direction is 0°. 
     Note that, in the seventh modified example, the circulation channel RJG may include the coupling channel RX 1 , the coupling channel RK 1 , the pressure chamber CB 1 , the communication channel RR 1 , the nozzle channel RNG, the channel R 11 , and the coupling channel RX 2  and may not include the channel R 12 , the channel R 13 , the channel R 14 , or the channel R 15 . The coupling channel RX 2  enables the channel R 11  and the discharge channel RA 2  to communicate with each other. 
     2.8. Eighth Modified Example 
     Although the liquid ejecting apparatus  100  of a serial type in which the endless belt  922  on which the liquid ejecting head  1 , the liquid ejecting head  1 A, the liquid ejecting head  1 B, the liquid ejecting head  1 C, the liquid ejecting head  1 D, the liquid ejecting head  1 E, the liquid ejecting head  1 F, or the liquid ejecting head  1 G is mounted is reciprocated in the Y-axis direction is exemplified in the embodiment and the first to seventh modified examples described above, the disclosure is not limited to such an aspect. The liquid ejecting apparatus may be a liquid ejecting apparatus of a line type in which a plurality of nozzles N are distributed over the entire width of the medium PP. 
       FIG. 20  illustrates an example of a configuration of a liquid ejecting apparatus  100 H according to an eighth modified example. The liquid ejecting apparatus  100 H differs from the liquid ejecting apparatus  100  according to the embodiment in terms of including a control device  90 H instead of the control device  90 , including a storage case  921 H instead of the storage case  921 , and not including the endless belt  922 . The control device  90 H differs from the control device  90  in terms of outputting no signal for controlling the endless belt  922 . The storage case  921 H is provided such that the plurality of liquid ejecting heads  1  having a longitudinal direction in the Y-axis direction are distributed over the entire width of the medium PP. Note that liquid ejecting heads  1 A, liquid ejecting heads  1 B, liquid ejecting heads  1 C, liquid ejecting heads  1 D, liquid ejecting heads  1 E, liquid ejecting heads  1 F, or liquid ejecting heads  1 G may be mounted on the storage case  921 H instead of the liquid ejecting heads  1 . 
     2.9. Ninth Modified Example 
     Although a piezoelectric element PZ that converts electrical energy into kinetic energy is exemplified as the energy conversion element that applies pressure to the inside of the pressure chamber CB in the embodiment and the first to eighth modified examples described above, the disclosure is not limited to such an aspect. As the energy conversion element that applies pressure to the inside of the pressure chamber CB, for example, a heating element that converts electrical energy into thermal energy, performs heating to generate air bubbles in the pressure chamber CB, and changes the pressure in the pressure chamber CB. The heating element may be, for example, an element in which a heating material generates heat in accordance with supply of the driving signal Com. 
     2.10. Tenth Modified Example 
     Although the nozzle channel RN exemplified in the embodiment, the first to third modified examples, and the fifth to seventh modified examples described above has the first portion U 1 , the second portion U 2 , and the third portion U 3 , the nozzle channel RN is not limited thereto and may have one or more portions in addition to the first portion U 1 , the second portion U 2 , and the third portion U 3 . For example, the nozzle channel RN in a tenth modified example has the first portion U 1 , the second portion U 2 , the third portion U 3 , and a fourth portion. The first portion U 1  extends in the −X direction and communicates with the communication channel RR 1 . The second portion U 2  extends in the V 1  direction and communicates with the first portion U 1 . The third portion U 3  extends in the direction rotated counterclockwise by angle θ 1  from the −X direction as viewed in the −Z direction and communicates with the second portion U 2 . The fourth portion extends in the −X direction and communicates with the third portion U 3  and the communication channel RR 2 . The nozzle N may be provided in the second portion U 2  or the third portion U 3 . 
     2.11. Eleventh Modified Example 
     In the nozzle channel RN exemplified in the embodiment, the first to fifth modified examples, and the seventh modified example described above, the second portion U 2  communicates with the nozzle N, but the first portion U 1  or the third portion U 3  may communicate with the nozzle N. 
     2.12. Twelfth Modified Example 
     In the embodiment and the first to fourth modified examples described above, the waveform of the driving signal Com 1  and the waveform of the driving signal Com 2  are substantially identical but may differ from each other. 
     2.13. Thirteenth Modified Example 
     The liquid ejecting apparatus exemplified in the embodiment and the first to ninth modified examples described above can be adopted for various apparatuses such as a facsimile apparatus and a copying machine in addition to equipment dedicated to printing. However, the liquid ejecting apparatus of the disclosure is not limited to being used for printing. For example, a liquid ejecting apparatus that ejects a solution of a color material is used as a manufacturing apparatus that forms a color filter of a liquid crystal display device. Further, a liquid ejecting apparatus that ejects a solution of a conductive material is used as a manufacturing apparatus that forms a wire and an electrode of a wiring substrate.