Liquid jet head and liquid jet recording device

Abstract

Provided are a liquid ejection head and the like that can reduce both manufacturing cost and power consumption. A liquid ejection head according to one embodiment of the present disclosure includes an ejection portion and one or more drive substrates. The drive substrate includes a first input terminal and a second input terminal, a plurality of drive devices, a plurality of transmission lines, and a plurality of terminal resistors. The plurality of drive devices respectively include a first input-output portion and a second input-output portion. The plurality of drive devices include a first drive device and a second drive device. The plurality of transmission lines include a first transmission line, a second transmission line, and one or more third transmission lines. The plurality of terminal resistors include a first terminal resistor, a second terminal resistor, and a third terminal resistor.

Description

Technical Field

[0001] The present disclosure relates to a liquid ejection head and a liquid ejection recording apparatus. Background Art

[0002] Liquid jet recording apparatuses including a liquid jet head are used in various fields, and various types of liquid jet heads have been developed as the liquid jet head (for example, refer to Patent Document 1).

[0003] Prior Art Literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2011-46160. Summary of the invention

[0006] Problems to be solved by the invention

[0007] In such a liquid ejecting head, it is generally required to reduce the manufacturing cost or the power consumption. It is desirable to provide a liquid ejecting head and a liquid ejecting recording apparatus capable of reducing both the manufacturing cost and the power consumption.

[0008] Solutions to Solve Problems

[0009] The liquid ejection head involved in one embodiment of the present disclosure is a liquid ejection head having an ejection portion for ejecting liquid and one or more drive substrates for outputting a drive signal for ejecting the liquid to the ejection portion. The drive substrate comprises: a first input terminal and a second input terminal, which input transmission data transmitted from the outside of the liquid ejection head; a plurality of drive devices, which are arranged in series between the first input terminal and the second input terminal, and generate the drive signal based on the transmission data input through one of the first input terminal and the second input terminal; a plurality of transmission lines, which are arranged between the first input terminal and the second input terminal via a plurality of drive devices arranged in series, and transmit the transmission data; and a plurality of terminal resistors, which are arranged on these plurality of transmission lines. The plurality of drive devices respectively have a first input-output portion and a second input-output portion for inputting or outputting the transmission data. The plurality of drive devices include a first drive device at one end of the series configuration and a second drive device at the other end of the series configuration. The plurality of transmission lines include: a first transmission line connected between the first input terminal and the first input / output unit in the first drive device; a second transmission line connected between the second input terminal and the second input / output unit in the second drive device; and one or more third transmission lines connected between the second input / output unit in the first drive device and the first input / output unit in the second drive device. The plurality of terminal resistors include: a first terminal resistor arranged near the first input / output unit in the first drive device on the first transmission line; a second terminal resistor arranged near the second input / output unit in the second drive device on the second transmission line; and a third terminal resistor arranged at one of the vicinity of one end and the vicinity of the other end of each of the one or more third transmission lines.

[0010] A liquid jet recording apparatus according to an embodiment of the present disclosure is an apparatus including the liquid jet head according to the embodiment of the present disclosure described above.

[0011] Effects of the Invention

[0012] According to the liquid jet head and the liquid jet recording apparatus according to one embodiment of the present disclosure, both manufacturing cost and power consumption can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a block diagram showing a schematic configuration example of a liquid ejecting device according to an embodiment of the present disclosure.

[0014] Figure 2 It is schematically indicated Figure 1 The illustrated perspective view is a schematic structural example of a liquid ejecting head.

[0015] Figure 3 It is schematically indicated Figure 2 A cross-sectional view showing an example of the structure of a liquid ejecting head shown.

[0016] Figure 4A It is schematically indicated Figure 2 , Figure 3 A top view of an example of a detailed configuration of a flexible substrate is shown.

[0017] Figure 4B It is schematically indicated Figure 2 , Figure 3 A top view of another example of a detailed configuration of a flexible substrate is shown.

[0018] Figure 5 It means in Figure 4A The diagram is a schematic diagram showing an example of the configuration of components within a flexible substrate.

[0019] Figure 6 It means in Figure 4B The diagrams shown are schematic diagrams of examples of the configuration of components within other flexible substrates.

[0020] Fig. 7A This is a circuit diagram showing an example of the arrangement and configuration of a general terminal resistor in a transmission line.

[0021] Figure 7B This is a circuit diagram showing another example of the arrangement and configuration of a general terminal resistor in a transmission line.

[0022] Figure 7C This is a circuit diagram showing another example of the arrangement and configuration of a general terminal resistor in a transmission line.

[0023] Fig. 8A This is a circuit diagram showing another example of the arrangement and configuration of a general terminal resistor in a transmission line.

[0024] Figure 8B This is a circuit diagram showing another example of the arrangement and configuration of a general terminal resistor in a transmission line.

[0025] Fig. 9 This is a schematic diagram showing an example of the arrangement and configuration of components in the flexible substrate in the liquid ejecting head according to Modification 1.

[0026] Fig.10 This is a schematic diagram showing an example of the arrangement and configuration of each component in the flexible substrate in the liquid ejecting head according to Modification 2.

[0027] Fig.11This is a schematic diagram showing an example of the arrangement and configuration of each component in the flexible substrate in the liquid ejecting head according to Modification 3.

[0028] Fig. 12A This is a schematic diagram showing an example of the arrangement and configuration of terminal resistors in a drive device according to Modification 4.

[0029] Fig. 12B 1 is a schematic diagram showing another example of the arrangement and configuration of the terminal resistors in the drive device according to the fourth modification. DETAILED DESCRIPTION

[0030] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the drawings. In addition, the description will be made in the following order.

[0031] 1. Implementation method (Example of configuration of drive device, transmission line, and terminal resistor)

[0032] 2. Modification 1-4 (Another example of terminal resistor configuration)

[0033] 3. Other variations

[0034] <1. Implementation Method>

[0035] [Schematic Structure of Printer 5]

[0036] Figure 1 This is a block diagram showing a schematic configuration example of a printer 5 as a liquid jet recording apparatus according to one embodiment of the present disclosure. Figure 2 It is schematically represented in a three-dimensional diagram as Figure 1 The diagram shows an example of a schematic configuration of an inkjet head 1 of a liquid ejecting head. Figure 3 It is schematically represented by a cross-sectional view (YZ cross-sectional view) Figure 2 FIG. 2 is a diagram showing an example of the structure of the inkjet head 1 shown.

[0037] In addition, in each of the drawings used for the description of this specification, the scale of each component is appropriately changed in order to make each component a recognizable size.

[0038] The printer 5 uses ink 9, which will be described later, to print on a recording medium (eg Figure 1 An inkjet printer that records (prints) images or text, etc., on the recording paper P shown in FIG. Figure 1 As shown, the printer 5 includes an inkjet head 1 , a print control unit 2 , and an ink tank 3 .

[0039] The inkjet head 1 corresponds to a specific example of a “liquid ejection head” in the present disclosure, and the printer 5 corresponds to a specific example of a “liquid ejection recording device” in the present disclosure. The ink 9 corresponds to a specific example of a “liquid” in the present disclosure.

[0040] (A. Printing control unit 2)

[0041] The printing control unit 2 is a component that supplies various information (data) to the inkjet head 1. Specifically, Figure 1 As shown, the print control unit 2 supplies a print control signal Sc to each of the inkjet heads 1 (such as a drive device 41 described later).

[0042] The print control signal Sc includes, for example, image data, a discharge timing signal, and a power supply voltage for operating the inkjet head 1 .

[0043] (B. Ink tank 3)

[0044] The ink tank 3 is a tank that contains ink 9. Figure 1 As shown, the ink 9 in the ink tank 3 is supplied to the inkjet head 1 (the ejection unit 11 described later) via the ink supply tube 30. The ink supply tube 30 is formed of, for example, a flexible hose having flexibility.

[0045] (C. Inkjet head 1)

[0046] The inkjet head 1 is as follows Figure 1 As shown by the dotted arrows in FIG. 1 , the head ejects (discharges) droplet-shaped ink 9 from a plurality of nozzle holes Hn described later onto the recording paper P to record images or text. Figure 2 , Figure 3 As shown, the inkjet head 1 includes one ejection unit 11 , one I / F (interface) substrate 12 , four flexible substrates 13 a , 13 b , 13 c , and 13 d , and two cooling units 141 and 142 .

[0047] (C-1. I / F substrate 12)

[0048] like Figure 2 , Figure 3 As shown, the I / F board 12 includes two connectors 10 , four connectors 120 a , 120 b , 120 c , and 120 d , and a circuit arrangement region 121 .

[0049] like Figure 2 As shown, the connector 10 is a portion (connector portion) that inputs the aforementioned printing control signal Sc supplied from the printing control unit 2 to the inkjet head 1 (the flexible substrates 13 a , 13 b , 13 c , and 13 d described later).

[0050] The connectors 120 a , 120 b , 120 c , and 120 d are portions (connector portions) that electrically connect the I / F substrate 12 and the flexible substrates 13 a , 13 b , 13 c , and 13 d , respectively.

[0051] The circuit arrangement region 121 is a region where various circuits are arranged on the I / F substrate 12. Alternatively, such a circuit arrangement region may be provided in other regions on the I / F substrate 12.

[0052] (C-2. Injection unit 11)

[0053] like Figure 1 As shown in FIG. 1 , the ejection unit 11 is a portion having a plurality of nozzle holes Hn, and ejecting ink 9 from these nozzle holes Hn. Such ejection of ink 9 is performed in accordance with a drive signal Sd (drive voltage Vd) supplied from a drive device 41 described later on each of the flexible substrates 13a, 13b, 13c, and 13d (see FIG. 1 ). Figure 1 ).

[0054] like Figure 1 As shown, such an ejection unit 11 includes an actuator plate 111 and a nozzle plate 112 .

[0055] (Nozzle plate 112)

[0056] The nozzle plate 112 is a plate made of a film material such as polyimide or a metal material, such as Figure 1 As shown in the figure, the above-mentioned plurality of nozzle holes Hn are provided. These nozzle holes Hn are formed side by side at predetermined intervals, for example, in a circular shape.

[0057] Specifically, in Figure 2 In the example of the ejection unit 11 shown, the plurality of nozzle holes Hn in the nozzle plate 112 are composed of a plurality of nozzle rows (four nozzle rows) arranged along the row direction (X-axis direction). In addition, the four nozzle rows are arranged side by side in a direction orthogonal to the row direction (Y-axis direction).

[0058] (Actuator plate 111)

[0059] The actuator plate 111 is a plate made of a piezoelectric material such as PZT (lead zirconate titanate). A plurality of channels (pressure chambers) are provided on the actuator plate 111. These channels are used to apply pressure to the ink 9 and are arranged side by side in a manner parallel to each other with a predetermined interval. Each channel is separated by a driving wall (not shown) composed of a piezoelectric body, and becomes a concave groove portion in cross-sectional observation.

[0060] Regarding such channels, there are discharge channels for discharging ink 9 and dummy channels (non-discharge channels) for not discharging ink 9. In other words, ink 9 is filled in the discharge channels, while ink 9 is not filled in the dummy channels. In addition, the filling of ink 9 in each discharge channel is performed, for example, via a flow path (common flow path) that is commonly connected to each such discharge channel. In addition, each discharge channel is independently connected to the nozzle hole Hn in the nozzle plate 112, while each dummy channel is not connected to the nozzle hole Hn. These discharge channels and dummy channels are alternately arranged side by side along the aforementioned column direction (X-axis direction).

[0061] In addition, driving electrodes are provided on the opposing inner side surfaces of the driving wall. The driving electrodes include a common electrode (common electrode) provided on the inner side surface facing the discharge channel and an active electrode (individual electrode) provided on the inner side surface facing the dummy channel. These driving electrodes are electrically connected to the driving device 41 described later via the flexible substrates 13a, 13b, 13c, and 13d. Thus, the driving voltage Vd (driving signal Sd) described above is applied to each driving electrode from the driving device 41 via the flexible substrates 13a, 13b, 13c, and 13d (see Figure 1 ).

[0062] (C-3. ​​Flexible substrates 13a, 13b, 13c, 13d)

[0063] The flexible substrates 13a, 13b, 13c, and 13d are respectively Figure 2 , Figure 3 As shown in FIG. 1 , the flexible substrates 13a, 13b, 13c, and 13d are electrically connected between the I / F substrate 12 and the ejection unit 11. The flexible substrates 13a, 13b, 13c, and 13d control the ejection of the ink 9 in each of the four nozzle columns in the nozzle plate 112. Figure 3 As shown by the symbols P1a, P1b, P1c, and P1d in FIG. 1 , each flexible substrate 13a, 13b, 13c, and 13d is bent near the portion where each flexible substrate 13a, 13b, 13c, and 13d is connected to the ejection unit 11 (near the crimping electrode 433). In addition, the crimping electrode 433 and the ejection unit 11 are electrically connected to each other by thermal compression using, for example, ACF (Anisotropic Conductive Film).

[0064] A driving device 41 is packaged separately on each of the flexible substrates 13a, 13b, 13c, and 13d (see Figure 3). Each of these driving devices 41 is a device that outputs a driving signal Sd (driving voltage Vd) for ejecting the ink 9 from the nozzle holes Hn in the corresponding nozzle array in the ejection unit 11. Therefore, such a driving signal Sd is output from each flexible substrate 13a, 13b, 13c, and 13d to the ejection unit 11. In addition, each of such driving devices 41 is composed of, for example, an ASIC (Application Specific Integrated Circuit) or the like.

[0065] In addition, each of these driving devices 41 is cooled by the aforementioned cooling units 141, 142. Specifically, Figure 3 As shown in the figure, cooling units 141 are fixedly arranged between the driving devices 41 on the flexible substrates 13a and 13b, and the cooling units 141 are pushed against the driving devices 41, so that each driving device 41 is cooled. Similarly, cooling units 142 are fixedly arranged between the driving devices 41 on the flexible substrates 13c and 13d, and the cooling units 142 are pushed against the driving devices 41, so that each driving device 41 is cooled. In addition, such cooling units 141 and 142 can be configured using cooling mechanisms of various types.

[0066] [Detailed Configuration of Flexible Substrates 13a, 13b, 13c, and 13d]

[0067] Next, in addition to Figure 1-Figure 3 In addition, refer to Figure 4A , Figure 4B , Figure 5 , Figure 6 A detailed configuration example of the above-mentioned flexible substrates 13a, 13b, 13c, and 13d will be described.

[0068] Figure 4A , Figure 4B It is schematically represented by a top view (ZX top view) Figure 2 , Figure 3 The flexible substrates 13a-13d are shown in FIG. Figure 4A An example of a planar configuration of the flexible substrates 13a and 13c (ZX planar configuration example) is shown. Figure 4B An example of a plan view configuration of the flexible substrates 13b and 13d (ZX plan view configuration example) is shown. Figure 5 It is schematically represented in Figure 4A FIG. 1 is a diagram showing an example of the configuration of the components in the flexible substrates 13a and 13c. Figure 6 It is schematically represented in Figure 4B The diagram shows an example of the arrangement and configuration of the components in the flexible substrates 13b and 13d.

[0069] First, as in Figure 4A , Figure 4B As shown in FIG. 1 and FIG. 2 , the flexible substrates 13a to 13d are provided with the following components, namely, a connection electrode 130, a first input terminal Tin1, a second input terminal Tin2, a first transmission line Lt1, a second transmission line Lt2, third transmission lines Lt31 to Lt34, a plurality of (five in this example) driving devices 41, and the aforementioned crimping electrode 433.

[0070] The connection electrode 130 is disposed in an end region of each of the flexible substrates 13 a - 13 d on the I / F substrate 12 side, and is an electrode for electrically connecting each of the flexible substrates 13 a - 13 d and the I / F substrate 12 .

[0071] The transmission data Dt (the aforementioned printing control signal Sc) transmitted from the outside of the inkjet head 1 (the aforementioned printing control unit 2) is input to the first input terminal Tin1 and the second input terminal Tin2 (see Figure 1 , Figure 2 , Figure 4A , Figure 4B ). In addition, such transmission data Dt is transmitted to each flexible substrate 13a-13d via one of the first input terminal Tin1 and the second input terminal Tin2. Specifically, for example, Figure 4A As shown in FIG. 1 , in the flexible substrates 13a and 13c, the transmission data Dt is transmitted to each flexible substrate 13a and 13c via the first input terminal Tin1. Figure 4B As shown, in the flexible substrates 13b and 13d, the transmission data Dt is transmitted to each of the flexible substrates 13b and 13d via the second input terminal Tin2.

[0072] exist Figure 4A , Figure 4B In the example shown, the five driving devices 41 are packaged on each of the flexible substrates 13a-13d (on the surface S1 and the back surface S2). Figure 4A , Figure 4B In the example shown, a first driving device 411, a second driving device 415, and three third driving devices 412-414 are provided. In addition, the five driving devices 41 are connected in series (cascade connection) between the first input terminal Tin1 and the second input terminal Tin2. Specifically, Figure 4A , Figure 4BAs shown in the figure, in any of the flexible substrates 13a-13d, the first drive device 411, the third drive devices 412-414 and the second drive device 415 are arranged in series from the first input terminal Tin1 side to the second input terminal Tin2 side. In other words, the first drive device 411 is located at one end of the series arrangement of such drive devices 41, and the second drive device 415 is located at the other end of the series arrangement. And a plurality of (three in this example) third drive devices 412-414 are located between these first drive devices 411 and the second drive device 415. These five drive devices 41 generate the aforementioned drive signal Sd based on the transmission data Dt input through one of the first input terminal Tin1 and the second input terminal Tin2 as described above. In addition, the drive signal Sd generated in this way is supplied to the ejection portion 11 side via the aforementioned crimping electrode 433 on each of the flexible substrates 13a-13d.

[0073] In addition, a plurality of transmission lines for transmitting transmission data Dt are arranged between the first input terminal Tin1 and the second input terminal Tin2 via five driving devices 41 arranged in series with each other. Figure 4A , Figure 4B As shown, a first transmission line Lt1 is arranged between the first input terminal Tin1 and the first driving device 411, and a second transmission line Lt2 is arranged between the second input terminal Tin2 and the second driving device 415. In addition, a third transmission line Lt31 is arranged between the first driving device 411 and the third driving device 412, and a third transmission line Lt32 is arranged between the third driving device 412 and the third driving device 413. A third transmission line Lt33 is arranged between the third driving device 413 and the third driving device 414, and a third transmission line Lt34 is arranged between the third driving device 414 and the second driving device 415.

[0074] Here, as described above, in the flexible substrates 13a, 13c and the flexible substrates 13b, 13d, the input terminals (first input terminal Tin1 or second input terminal Tin2) to which the transmission data Dt is input are different from each other (see Figure 4A , Figure 4B ). In addition, in the flexible substrates 13a, 13c and the flexible substrates 13b, 13d, the transmission directions of the input transmission data Dt in the substrates are different from each other. That is, in the flexible substrates 13a, 13c, the transmission data Dt input from the first input terminal Tin1 is transmitted in the order of the first drive device 411, the third drive device 412, 413, 414 and the second drive device 415 (refer to Figure 4AOn the other hand, in the flexible substrates 13b and 13d, the transmission data Dt input from the second input terminal Tin2 is transmitted in the order of the second drive device 415, the third drive device 414, 413, 412 and the first drive device 411 (refer to Figure 4B ).

[0075] As such, the input terminals for inputting transmission data Dt and the transmission directions of transmission data Dt are different in the flexible substrates 13a, 13c and the flexible substrates 13b, 13d. However, the structures of the substrates themselves are the same in the flexible substrates 13a, 13c and the flexible substrates 13b, 13d, and the structures of the flexible substrates 13a-13d are common (shared) (see Figure 4A , Figure 4B That is, as will be described in detail later, there is no need to prepare a plurality of flexible substrates (drive substrates) corresponding to the transmission direction of the transmission data Dt, and only one type of flexible substrate (drive substrate) is provided in the inkjet head 1 .

[0076] (Example of terminal resistor configuration)

[0077] Here, if Figure 5 , Figure 6 As shown, the five driving devices 41 (the first driving device 411, the third driving devices 412-414, and the second driving device 415) mentioned above each have a pair of input-output parts (input-output terminals) for inputting and outputting (inputting or outputting) the transmission data Dt. Specifically, the first driving device 411, the third driving devices 412-414, and the second driving device 415 each have a first input-output part Tio1 and a second input-output part Tio2.

[0078] Therefore, if Figure 5 , Figure 6As shown, the aforementioned first transmission line Lt1 is connected between the first input terminal Tin1 and the first input-output part Tio1 in the first driving device 411. In addition, the second transmission line Lt2 is connected between the second input terminal Tin2 and the second input-output part Tio2 in the second driving device 415. In addition, four third transmission lines Lt31--Lt34 are connected between the second input-output part Tio2 in the first driving device 411 and the first input-output part Tio1 in the second driving device 415 via three third driving devices 412-414. Specifically, the third transmission line Lt31 is connected between the second input-output part Tio2 in the first driving device 411 and the first input-output part Tio1 in the third driving device 412. In addition, the third transmission line Lt32 is connected between the second input-output part Tio2 in the third driving device 412 and the first input-output part Tio1 in the third driving device 413. The third transmission line Lt33 is connected between the second input / output part Tio2 in the third driving device 413 and the first input / output part Tio1 in the third driving device 414. The third transmission line Lt34 is connected between the second input / output part Tio2 in the third driving device 414 and the first input / output part Tio1 in the second driving device 415.

[0079] Then, if Figure 5 , Figure 6 As shown, multiple terminal resistors are arranged on these multiple transmission lines (first transmission line Lt1, second transmission line Lt2, and third transmission lines Lt31-Lt34) as follows. That is, on the first transmission line Lt1, a first terminal resistor Rt1 is arranged near the first input / output part Tio1 in the first driving device 411. In addition, on the second transmission line Lt2, a second terminal resistor Rt2 is arranged near the second input / output part Tio2 in the second driving device 415.

[0080] In addition, in each of the four third transmission lines Lt31-Lt34, a third terminal resistor Rt31-Rt34 is arranged near one end and near the other end. Figure 5 , Figure 6As shown, a third terminal resistor Rt31 is arranged near one end of the third transmission line Lt31 (near the end on the first drive device 411 side), that is, near the second input-output part Tio2 in the first drive device 411. In addition, a third terminal resistor Rt32 is arranged near the other end of the third transmission line Lt32 (near the end on the second drive device 415 side), that is, near the first input-output part Tio1 in the third drive device 413. A third terminal resistor Rt33 is arranged near one end of the third transmission line Lt33 (near the end on the first drive device 411 side), that is, near the second input-output part Tio2 in the third drive device 413. A third terminal resistor Rt34 is arranged near the other end of the third transmission line Lt34 (near the end on the second drive device 415 side), that is, near the first input-output part Tio1 in the second drive device 415. In this way, Figure 5 , Figure 6 In the example of FIG. 1 , the third terminal resistors Rt31 - Rt34 in each of the four third transmission lines Lt31 - Lt34 are alternately arranged near the end on the first drive device 411 side and near the end on the second drive device 415 side.

[0081] In addition, the details will be described later. Generally speaking, it is not the best configuration to place the terminal resistor on the transmission end (output end) side of the transmission line. However, in the case where the length of the transmission line (line length) used to cascade multiple drive devices is relatively short, even if the position of the terminal resistor is slightly deviated from the receiving end (input end) side, which is the best configuration, it can be said that there is generally no problem. Figure 5 , Figure 6 In the example of FIG. 1 , in the case where the transmission data Dt is input from the first input terminal Tin1 side ( Figure 5 ) and the case where the transmission data Dt is input from the second input terminal Tin2 side ( Figure 6 ), the number of terminal resistors (two) configured on the receiving end side and the number of terminal resistors (two) configured on the transmitting end side are respectively consistent with each other. As a result, there will be no deviation in the transmission quality of the transmission data Dt depending on the input direction (transmission direction) of the transmission data Dt.

[0082] In addition, the line lengths in the third transmission lines Lt31-Lt34 are each less than 1 / 4 of the signal wavelength λt obtained from the transmission frequency ft of the transmission data Dt (L31-L34<λt×1 / 4). In addition, it is more desirable that the line lengths in the third transmission lines Lt31-Lt34 are each less than 1 / 8 of the signal wavelength λt (L31-L34<λt×1 / 8). This is because the value of 1 / 4 is equivalent to a phase of 90°, which is the limit value that can maintain the transmission quality to the extent that no transmission error will occur in the circuit on the receiving side if the transmission line is short to this extent. In addition, the value of 1 / 8 is equivalent to a phase of 45°, which is more preferable because it suppresses the deterioration of the transmission quality caused by the phase shift compared to the case of 1 / 4 of the limit value.

[0083] Here, the above-mentioned flexible substrates 13a-13d correspond to a specific example of the "driving substrate" in the present disclosure. In addition, the first input terminal Tin1 and the second input terminal Tin2 correspond to a specific example of the "first input terminal" and the "second input terminal" in the present disclosure. In addition, the first input-output unit Tio1 and the second input-output unit Tio2 correspond to a specific example of the "first input-output unit" and the "second input-output unit" in the present disclosure. In addition, the first drive device 411 corresponds to a specific example of the "first drive device" in the present disclosure, the second drive device 415 corresponds to a specific example of the "second drive device" in the present disclosure, and the third drive devices 412-414 correspond to a specific example of the "third drive device" in the present disclosure. In addition, the first transmission line Lt1 corresponds to a specific example of the "first transmission line" in the present disclosure, the second transmission line Lt2 corresponds to a specific example of the "second transmission line" in the present disclosure, and the third transmission lines Lt31-Lt34 correspond to a specific example of the "third transmission line" in the present disclosure. In addition, the first terminal resistor Rt1 corresponds to a specific example of the "first terminal resistor" in the present disclosure, the second terminal resistor Rt2 corresponds to a specific example of the "second terminal resistor" in the present disclosure, and the third terminal resistors Rt31-Rt34 respectively correspond to a specific example of the "third terminal resistor" in the present disclosure.

[0084] [Actions and effects]

[0085] (A. Basic operation of printer 5)

[0086] In the printer 5, an operation of recording an image or text or the like on a recording medium (recording paper P or the like) is performed by ejecting ink 9 through the inkjet head 1 as follows. Specifically, in the inkjet head 1 of the present embodiment, an operation of ejecting ink 9 using a shearing (cutting) mode is performed as follows.

[0087] First, the driving devices 41 on each of the flexible substrates 13a, 13b, 13c, and 13d apply a driving voltage Vd (driving signal Sd) to the aforementioned driving electrodes (common electrodes and active electrodes) in the actuator plate 111 in the ejection unit 11. Specifically, each driving device 41 applies a driving voltage Vd to each driving electrode disposed on a pair of driving walls that separate the aforementioned discharge channel. As a result, the pair of driving walls are deformed so as to protrude toward the dummy channel side adjacent to the discharge channel.

[0088] At this time, the driving wall is bent and deformed in a V-shape with the middle position in the depth direction of the driving wall as the center. Then, due to such bending deformation of the driving wall, the discharge channel is deformed in a manner as if it is bulging. In this way, due to the bending deformation caused by the piezoelectric thickness slip effect at a pair of driving walls, the volume of the discharge channel increases. Then, due to the increase in the volume of the discharge channel, the ink 9 is guided into the discharge channel.

[0089] Then, the ink 9 guided into the discharge channel in this way becomes a pressure wave and propagates to the inside of the discharge channel. Then, when the pressure wave reaches the nozzle hole Hn of the nozzle plate 112 (or a timing near it), the driving voltage Vd applied to the driving electrode becomes 0 (zero) V. As a result, the driving wall recovers from the above-mentioned bending and deforming state, and as a result, the volume of the discharge channel that has been temporarily increased returns to its original state.

[0090] As a result, the ink 9 in the discharge channel is pressurized while the volume of the discharge channel is restored to its original state. As a result, the ink 9 in the form of droplets is discharged to the outside (toward the recording paper P) through the nozzle hole Hn (see FIG. Figure 1 ). In this way, the ink 9 in the inkjet head 1 is ejected (discharged), and as a result, an image or text is recorded on the recording paper P.

[0091] (B. Function / effect in inkjet head 1)

[0092] Next, the operation and effect of the inkjet head 1 of the present embodiment will be described in detail in comparison with the configuration example of a conventional general terminal resistor ( Figure 7A-7C , Fig. 8A , Figure 8B ) are compared and explained in detail.

[0093] (B-1. Example of general terminal resistor configuration)

[0094] Figure 7A-7C and Fig. 8A , Figure 8B Each of them is a diagram showing an example of a general arrangement configuration of a terminal resistor in a transmission line as a circuit diagram.

[0095] First, in recent years, high-speed differential transmission such as LVDS (Low Voltage Differential Signaling) has been widely used inside inkjet printers. Therefore, it is important to efficiently route high-speed differential lines in narrow inkjet heads. As a problem that arises at that time, the configuration method of terminal resistors on such high-speed differential lines is listed.

[0096] In recent years, there are devices that can adapt to bidirectional transmission (i.e., one port can be used as both a receiving end (input end) and a transmitting end (output end)). Devices that can perform such bidirectional transmission are suitable for increasing the density of parts or wiring on the substrate in circuits that require miniaturization, such as the inside of an inkjet head, and are very expensive. In existing general inkjet heads, drive devices that can perform such bidirectional transmission are used to simplify the cascade connection (series connection) of these drive devices to each other, thereby improving the circuit integration.

[0097] However, in recent years, in order to improve the production efficiency during printing, the inkjet head requires a higher speed when transmitting printing data, and with this, high-speed differential transmission as described above is required. Regarding such high-speed differential transmission, in addition to the above-mentioned LVDS, various transmission methods such as CML (Current Mode Logic) are known. Basically, a terminal resistor with the same value as the characteristic impedance of the high-speed differential line is configured at the receiving end (input end).

[0098] Specifically, for example Fig. 7A As shown in FIG. 1 , when the differential line 300 as a high-speed differential line is connected between the transmission end 101 in the device 100 and the reception end 202 in the device 200, a terminal resistor Rt is arranged on the input side of the reception end 202. Figure 7B In the example shown, a terminal resistor Rt is arranged at the input portion of the receiving end 202 inside the device 200 .

[0099] Here, in the so-called "multi-point" type transmission method (a method of performing LVDS transmission from one transmitting end to multiple receiving ends) as described in Patent Document 1, a terminal resistor is configured only for one of the multiple receiving ends. This is because if a terminal resistor is configured for all receiving ends, the terminal resistance value becomes low, which places a heavy load on the receiving-side device. However, if a terminal resistor is configured for only one receiving end in this way, a high-frequency signal is reflected at the receiving end at a position relatively far from the terminal resistor, and the quality of the digital signal waveform deteriorates, making it easy to generate transmission errors caused by, for example, H (High) / L (Low) judgment errors. In addition, in order to solve this problem, the configuration freedom of the terminal resistor or the device is greatly reduced.

[0100] Therefore, in the device (drive device) in the inkjet head, when data is transmitted to multiple drive devices, the aforementioned cascade connection is sometimes performed to output the input data transmitted using LVDS to the subsequent drive device. It is believed that the problem of terminal resistance such as the above-mentioned "multi-point type" can be solved by performing such cascade connection.

[0101] However, there are still problems in the case of this cascade connection. Specifically, for example, in an inkjet head, generally there are many nozzle arrays that are operated by a driving device, and therefore, many substrates (driving substrates) for driving these many nozzle arrays are also needed. In addition, in such a case, the many driving substrates are often arranged with the front and back surfaces opposite to each other, for example, with respect to metal parts (cooling units, etc.) in the inkjet head. By the way, as previously used Figure 3 As described above, in the inkjet head 1 of this embodiment, the flexible substrates 13 a and 13 c and the flexible substrates 13 b and 13 d as a plurality of drive substrates are also arranged with their front and back surfaces reversed with respect to the cooling units 141 and 142 , respectively.

[0102] Moreover, in such a case, for example, as mentioned above Figure 4A , Figure 4B In this way, the receiving ends (input ends) of the multiple drive devices connected in cascade are sometimes switched depending on the setting direction. Therefore, in order to cope with this, it is necessary to prepare a variety of drive substrates as they are. Figure 4A In the flexible substrates 13a and 13c of the driving substrate shown in the figure, a terminal resistor is temporarily arranged on the first input terminal Tin1 side (in this case, the receiving end side (input end side)) of each driving device 41. Moreover, such a terminal resistor arrangement is also applied to the Figure 4BIn the case of the flexible substrates 13b and 13d of the driving substrate shown in the figure, a terminal resistor is respectively arranged on the transmission end side (output end side) of each driving device 41. Therefore, in such an example of the arrangement and configuration of the terminal resistor, since effective data transmission cannot be performed, it is necessary to prepare two types of driving substrates in the housing.

[0103] As described above, when a plurality of types of drive substrates are required, the management cost increases when manufacturing the inkjet head.

[0104] Therefore, in order to avoid such an increase in management costs, it is ideal to reduce the types of driver substrates, but in this case, it is necessary to provide input and output terminals (input and output parts) capable of bidirectional transmission in each driver device. Although a driver substrate adapted to such bidirectional transmission can be adapted relatively easily in low-speed single-ended communication, for example, in high-speed differential transmission such as the above-mentioned LVDS, the problem of terminal resistance still emerges.

[0105] For example, in the case where two driving devices connected in cascade are adapted to bidirectional transmission, terminal resistors are required at both ends of the transmission line connected to the two driving devices. Figure 7C In the example shown, terminal resistors Rt100 and Rt200 are arranged at both ends of a differential line 300 connected between two devices 100 and 200 adapted for bidirectional transmission. Specifically, terminal resistor Rt100 is arranged near the transmitting end 101 and the receiving end 102 in the device 100, and terminal resistor Rt200 is arranged near the transmitting end 201 and the receiving end 202 in the device 200.

[0106] As such, in the case of multiple drive devices connected in cascade, if terminal resistors are arranged at both ends of the transmission line, the voltage amplitude level satisfied at the receiving end becomes half, and in order to compensate for this, it is necessary to increase the current used in the transmission from the transmitting end, for example. That is, in this case, the current consumption during data transmission increases.

[0107] By the way, in order to avoid such an increase in current consumption, a method of switching the terminal resistor's on state (valid state) and off state (invalid state) by selectively packaging the control terminal or the parts is also considered. Fig. 8A , Figure 8B In the example shown above, Figure 7C In the configuration example, switches SW1 and SW2 are additionally provided for individually switching the on state and the off state of the terminal resistors Rt100 and Rt200.

[0108] Here, in Fig. 8AIn the case of , the control terminal Tc1 is set to the "L" state so that the switch SW1 is set to the off state, and the control terminal Tc2 is set to the "H" state so that the switch SW2 is set to the on state. Fig. 8A In the case of , of the two terminal resistors Rt100 and Rt200 located at both ends of the differential line 300, the terminal resistor Rt100 becomes inactive, and only the terminal resistor Rt200 becomes active. Figure 8B In the case of , the control terminal Tc1 is set to the "H" state so that the switch SW1 is set to the on state, and the control terminal Tc2 is set to the "L" state so that the switch SW2 is set to the off state. Figure 8B In the case of , of the two terminal resistors Rt100 and Rt200 located at both ends of the differential line 300, the terminal resistor Rt200 becomes inactive, and only the terminal resistor Rt100 becomes active.

[0109] However, in such a method, the remaining control terminals or parts (switches, etc.) cause a large pressure on the drive substrate for the inkjet head, which has a high packaging density or wiring density. In addition, for reasons of management in the manufacturing of the drive substrate, selective packaging of parts is a method that is intended to be avoided as much as possible. In other words, considering the configuration of the terminal resistor, it can be said that such a method of switching the terminal resistor between the effective state and the ineffective state is not ideal.

[0110] As such, in the conventional general terminal resistor configuration example, the management cost of the drive substrate increases, or the current consumption during data transmission increases. As a result, in the conventional terminal resistor configuration example, it can be said that the manufacturing cost or power consumption of the inkjet head may increase.

[0111] (B-2. Action / Effect)

[0112] On the other hand, in the ink jet head 1 of the present embodiment, by adopting the following configuration, for example, the following operations and effects are obtained.

[0113] That is, first, in the inkjet head 1, transmission data Dt is exclusively inputted via one of the first input terminal Tin1 and the second input terminal Tin2 in each of the flexible substrates 13a, 13b, 13c, and 13d. In addition, between the first input terminal Tin1 and the second input terminal Tin2, the transmission data Dt is bidirectionally inputted and outputted between the plurality of drive devices 41 that are arranged in series (cascade-connected) with each other. Specifically, the transmission data Dt is bidirectionally inputted and outputted via the plurality of transmission lines (the first transmission line Lt1, the second transmission line Lt2, and the third transmission lines Lt31-Lt34) and the first input / output unit Tio1 and the second input / output unit Tio2.

[0114] Thus, when a plurality of flexible substrates 13a, 13b, 13c, and 13d are used in the inkjet head 1, the configuration of the flexible substrates 13a and 13c to which the transmission data Dt is input from the first input terminal Tin1 and the configuration of the flexible substrates 13b and 13d to which the transmission data Dt is input from the second input terminal Tin2 can be made common (shared). As a result, in the inkjet head 1, the management cost of the flexible substrates 13a, 13b, 13c, and 13d as drive substrates can be reduced.

[0115] Here, when the transmission data Dt is input from the first input terminal Tin1 (see Figure 5 ), the first terminal resistor Rt1 arranged near the receiving end (the first input / output unit Tio1 of the first driving device 411) on the first transmission line Lt1 functions as a terminal resistor when the transmission data Dt is input from the outside of the inkjet head 1. On the other hand, when the transmission data Dt is input from the second input terminal Tin2 (refer to Figure 6 ), the second terminal resistor Rt2 arranged near the receiving end (the second input / output unit Tio2 of the second driving device 415) on the second transmission line Lt2 functions as a terminal resistor when the transmission data Dt is input from the outside of the inkjet head 1.

[0116] In any of these cases (see Figure 5 , Figure 6 ), each of the third terminal resistors Rt31-Rt34 configured on the plurality of third transmission lines Lt31-Lt34 functions as a terminal resistor when transmitting the transmission data Dt between the plurality of drive devices 41 configured in series (during data transmission). Moreover, such third terminal resistors Rt31-Rt34 are respectively configured at only one of the vicinity of one end and the vicinity of the other end of the third transmission line Lt31-Lt34. Thus, for example, compared with the case where the third terminal resistors Rt31-Rt34 are configured near both ends of the third transmission line (for example, the aforementioned Figure 7C Compared with the case where the data is transmitted between multiple drive devices 41, the current consumption during the data transmission between multiple drive devices 41 can be suppressed.

[0117] As described above, in this embodiment, the management cost of the flexible substrates 13a, 13b, 13c, and 13d as drive substrates can be reduced while suppressing the current consumption during data transmission. As a result, in this embodiment, both the manufacturing cost and power consumption of the inkjet head 1 can be reduced.

[0118] In addition, in the present embodiment, when three or more driving devices 41 are arranged in series, the third terminal resistors Rt31-Rt34 in each of the plurality of third transmission lines Lt31-Lt34 are alternately arranged. Specifically, these third terminal resistors Rt31-Rt34 are alternately arranged near the end of the first driving device 411 side and near the end of the second driving device 415 side. Thus, when the transmission data Dt is input from the first input terminal Tin1 (refer to Figure 5 ) and the case where the transmission data Dt is input from the second input terminal Tin2 (refer to Figure 6 ), the difference in the configuration position of the third terminal resistors Rt31-Rt34 becomes smaller (the fluctuation of the configuration position decreases). Therefore, in these cases (refer to Figure 5 , Figure 6 ) when the quality of data transmission between multiple drive devices 41 is roughly uniform, resulting in stable data transmission being able to be achieved.

[0119] Furthermore, in this embodiment, the line lengths L31-L34 of the third transmission lines Lt31-Lt34 are respectively set to values ​​lower than 1 / 4 of the aforementioned signal wavelength λt (L31-L34<λt×1 / 4), and thus become as follows. That is, when the transmission data Dt is transmitted on the third transmission lines Lt31-Lt34, even if the third terminal resistors Rt31-Rt34 are not located at the receiving end (input end) but at the transmitting end (output end) corresponding to the transmission direction of the transmission data Dt, the quality of data transmission is almost not reduced (deterioration of the transmission signal). As a result, stable data transmission can be achieved.

[0120] <2. Modifications>

[0121] Next, modifications (modifications 1 to 4) of the above-described embodiment will be described. In addition, in the following, the same reference numerals are given to the same components as those in the embodiment, and the description thereof will be appropriately omitted.

[0122] [Variation 1-3]

[0123] (constitute)

[0124] Fig. 9 1 is a diagram schematically showing an example of the arrangement and configuration of each component in a flexible substrate 13A in a liquid ejecting head (ink jet head 1A) according to Modification 1. Fig.10 This is a diagram schematically showing an example of the arrangement and configuration of each component in the flexible substrate 13B in the liquid ejecting head (ink jet head 1B) according to Modification 2. Fig.11This is a diagram schematically showing an example of the arrangement and configuration of each component in a flexible substrate 13C in a liquid ejecting head (ink jet head 1C) according to Modification 3.

[0125] In addition, each of these inkjet heads 1A to 1C corresponds to a specific example of the “liquid jet head” in the present disclosure. In addition, a printer including these inkjet heads 1A to 1C corresponds to a specific example of the “liquid jet recording device” in the present disclosure.

[0126] First, in Fig. 9 In the inkjet head 1A of the modified example 1 shown in the figure, the following components are provided in the flexible substrate 13A having the first input terminal Tin1 and the second input terminal Tin2. That is, the first driving device 411, the second driving device 415, the first transmission line Lt1, the second transmission line Lt2, the third transmission line Lt31, the first terminal resistor Rt1, the second terminal resistor Rt2, and the third terminal resistor Rt31 are provided in the flexible substrate 13A. The flexible substrate 13A is Figure 5 , Figure 6 The flexible substrates 13a-13d of the embodiment shown in the figure are changed as follows, and the other structures are basically the same. That is, the flexible substrate 13A becomes a flexible substrate as follows: the three third drive devices 412-414 are omitted (not provided), and the three third transmission lines Lt32-Lt34 and the three third terminal resistors Rt32-Rt34 are omitted. In addition, the third terminal resistor Rt31 is arranged near one end of the third transmission line Lt31 (near the end on the first drive device 411 side), that is, near the second input / output unit Tio2 in the first drive device 411.

[0127] In addition, Fig.10 In the inkjet head 1B of the second variation shown in the figure, the following components are provided in the flexible substrate 13B having the first input terminal Tin1 and the second input terminal Tin2. That is, the first drive device 411, the second drive device 415, the third drive device 412, the first transmission line Lt1, the second transmission line Lt2, the third transmission line Lt31, Lt32, the first terminal resistor Rt1, the second terminal resistor Rt2, and the third terminal resistors Rt31, Rt32 are provided in the flexible substrate 13B. The flexible substrate 13B is provided with Fig. 9The flexible substrate 13A of the modification example 1 shown is modified as follows, and the other structures are basically the same. That is, the flexible substrate 13B becomes a flexible substrate as follows: a third drive device 412 is further provided, and a third transmission line Lt32 and a third terminal resistor Rt32 are further provided. In addition, the third terminal resistor Rt32 is arranged near the other end of the third transmission line Lt32 (near the end on the second drive device 415 side), that is, near the first input / output unit Tio1 in the second drive device 415.

[0128] In addition, Fig.11 In the inkjet head 1C of the third variation shown in the figure, the following components are provided in the flexible substrate 13C having the first input terminal Tin1 and the second input terminal Tin2. That is, the first drive device 411, the second drive device 415, the third drive devices 412 and 413, the first transmission line Lt1, the second transmission line Lt2, the third transmission lines Lt31, Lt32 and Lt33, the first terminal resistor Rt1, the second terminal resistor Rt2 and the third terminal resistors Rt31, Rt32 and Rt33 are provided in the flexible substrate 13C. Fig.10 The flexible substrate 13B of the modification example 2 shown is a flexible substrate modified as follows, and the other structures are basically the same. That is, the flexible substrate 13C becomes a flexible substrate as follows: a third drive device 413 is further provided, and a third transmission line Lt33 and a third terminal resistor Rt33 are further provided. In addition, the third terminal resistor Rt33 is arranged near the other end of the third transmission line Lt33 (near the end on the second drive device 415 side), that is, near the first input / output part Tio1 in the second drive device 415. Therefore, in this modification example 3, unlike the embodiment and modification examples 1 and 2 described so far, it becomes a modification example in which the three third terminal resistors Rt31-Rt34 are not alternately arranged near the end on the first drive device 411 side and near the end on the second drive device 415 side.

[0129] (Function / Effect)

[0130] In the modified examples 1 to 3 of such a configuration, the same effect can be obtained by basically the same operation as the embodiment. That is, the management cost of the flexible substrates 13A, 13B, and 13C as the drive substrate can be reduced while the current consumption during data transmission can be reduced. As a result, both the manufacturing cost and the power consumption of the inkjet heads 1A to 1C can be reduced.

[0131] [Variation 4]

[0132] Fig. 12A , Fig. 12B is a diagram schematically showing an example of the configuration of the terminal resistor Rt in the drive devices 41D1 and 41D2 according to the modification example 4. Specifically, Fig. 12A FIG. 4 shows an example of the configuration of the terminal resistor Rt in the drive device 41D1. Fig. 12B An example of the configuration of the terminal resistor Rt in the drive device 41D2 is shown.

[0133] In addition, the inkjet head including these drive devices 41D1 and 41D2 corresponds to a specific example of the "liquid ejection head" in the present disclosure. In addition, the printer including such an inkjet head corresponds to a specific example of the "liquid ejection recording apparatus" in the present disclosure.

[0134] First, in Fig. 12A In the driving device 41D1 shown, a terminal resistor Rt is provided inside the driving device 41D1 (inside the first input / output unit Tio1). The terminal resistor Rt is a terminal resistor equivalent to at least one of the terminal resistors (the first terminal resistor Rt1, the second terminal resistor Rt2, and the third terminal resistors Rt31-Rt34) described so far.

[0135] On the other hand, Fig. 12B In the driving device 41D2 shown, a terminal resistor Rt is provided inside the driving device 41D2 (inside the second input / output unit Tio2). The terminal resistor Rt is also a terminal resistor corresponding to at least one of the terminal resistors described above.

[0136] As such, in Modification 4, since at least one of the first terminal resistor Rt1, the second terminal resistor Rt2, and the third terminal resistors Rt31-Rt34 is provided (built-in) inside the driving device 41D1, 41D2, it becomes as follows. That is, on the flexible substrates 13a, 13b, 13c, 13d as the driving substrate, the packaging parts or the circuit scale are reduced. As a result, in Modification 4, the manufacturing cost of the inkjet head can be further reduced and the inkjet head can be miniaturized.

[0137] <3. Other Modifications>

[0138] As mentioned above, although several embodiments and modification examples were listed to explain this disclosure, this disclosure is not limited to these embodiments and the like, and various modifications are possible.

[0139] For example, in the above-mentioned embodiments, the configuration examples (shape, configuration, number, etc.) of each component in the printer 5 and the inkjet heads 1, 1A-1C are specifically listed for explanation, but the configuration examples are not limited to those described in the above-mentioned embodiments, and other shapes, configurations, numbers, etc. may also be possible.

[0140] Specifically, for example, in the above-mentioned embodiments, examples of configurations such as a flexible substrate (driving substrate), a driving device, a transmission line, and a terminal resistor are specifically listed and described, but these configuration examples are not limited to the configuration examples described in the above-mentioned embodiments, etc. For example, in the above-mentioned embodiments, the case where the "driving substrate" in the present disclosure is a flexible substrate is described as an example, but the "driving substrate" in the present disclosure may also be a non-flexible substrate.

[0141] Furthermore, the numerical examples of various parameters described in the above-mentioned embodiments are not limited to the numerical examples described in the embodiments, and other numerical values ​​may be used. Specifically, for example, in the above-mentioned embodiments, the line lengths L31-L34 of the third transmission lines Lt31-Lt34 are respectively given as values ​​less than 1 / 4 of the aforementioned signal wavelength λt (L31-L34<λt×1 / 4), but the present invention is not limited to this example. That is, depending on the situation, for example, at least one of the line lengths L31-L34 may be a value greater than 1 / 4 of the signal wavelength λt (L31-L34≧λt×1 / 4).

[0142] In addition, various types of structures can be applied to the structure of the inkjet head. That is, for example, it can also be a so-called side shoot type inkjet head that discharges the ink 9 from the central part of the extension direction of each discharge channel in the actuator plate 111. Or, for example, it can also be a so-called edge shoot type inkjet head that discharges the ink 9 along the extension direction of each discharge channel. Furthermore, as a printer method, it is not limited to the method described in the above-mentioned embodiment, etc., for example, various methods such as MEMS (Micro Electro Mechanical Systems) method can be applied.

[0143] Furthermore, for example, the present disclosure can be applied to either a circulation type inkjet head that utilizes the ink 9 by circulating it between an ink tank and the inkjet head or a non-circulation type inkjet head that utilizes the ink 9 without circulating it.

[0144] In addition, the series of processing described in the above embodiments and the like can be performed by hardware (circuit) or by software (program). In the case of being performed by software, the software is composed of a group of programs for executing various functions by a computer. Each program can be pre-installed in the above-mentioned computer for use, or can be installed in the above-mentioned computer from a network or a recording medium for use.

[0145] Furthermore, in the above-mentioned embodiments, the printer 5 (inkjet printer) is cited as a specific example of the "liquid jet recording device" in the present disclosure for explanation, but the present disclosure is not limited to this example, and the present disclosure can also be applied to other devices other than the inkjet printer. In other words, the "liquid jet head" (inkjet head) of the present disclosure can also be applied to other devices other than the inkjet printer. Specifically, for example, the "liquid jet head" of the present disclosure can also be applied to devices such as fax or on-demand printers.

[0146] Furthermore, the various examples described so far may be applied in any combination.

[0147] In addition, the effects described in this specification are merely illustrative and are not intended to be limiting effects, and other effects may also exist.

[0148] In addition, the present disclosure can also take the following configurations. (1)

[0150] A liquid ejecting head is a liquid ejecting head for ejecting liquid, wherein the head comprises:

[0151] a spraying portion that sprays the aforementioned liquid; and

[0152] one or more drive substrates, which output a drive signal for ejecting the liquid to the ejection unit,

[0153] The aforementioned drive substrate comprises:

[0154] a first input terminal and a second input terminal for inputting transmission data transmitted from the outside of the aforementioned liquid ejecting head;

[0155] a plurality of drive devices, which are arranged in series between the first input terminal and the second input terminal, and generate the drive signal based on the transmission data input through one of the first input terminal and the second input terminal;

[0156] a plurality of transmission lines, which transmit the transmission data via the plurality of driving devices arranged in series between the first input terminal and the second input terminal; and

[0157] A plurality of terminal resistors are arranged on the plurality of transmission lines.

[0158] The plurality of drive devices respectively have a first input / output unit and a second input / output unit for inputting or outputting the transmission data, and

[0159] The aforementioned multiple drive devices include:

[0160] A first drive device located at one end of the series configuration; and

[0161] A second drive device, which is located at the other end of the aforementioned series configuration,

[0162] The aforementioned multiple transmission lines include:

[0163] A first transmission line connected between the first input terminal and the first input-output section of the first driving device;

[0164] a second transmission line connected between the second input terminal and the second input-output section in the second driving device; and

[0165] one or more third transmission lines connected between the second input / output section in the first driving device and the first input / output section in the second driving device,

[0166] The aforementioned multiple terminal resistors include:

[0167] A first terminal resistor, which is arranged on the first transmission line near the first input / output portion of the first driving device;

[0168] A second terminal resistor is disposed on the second transmission line near the second input / output portion of the second driving device; and

[0169] The third terminal resistor is arranged at one of the vicinity of one end and the vicinity of the other end of each of the one or more third transmission lines. (2)

[0171] The liquid ejecting head according to (1) above, wherein:

[0172] The plurality of drive devices further include one or more third drive devices located between the first drive device and the second drive device in the series configuration, and

[0173] The plurality of third transmission lines are connected between the second input / output section in the first driving device and the first input / output section in the second driving device via the one or more third driving devices.

[0174] The third terminal resistors in each of the plurality of third transmission lines are alternately arranged near the end on the first drive device side and near the end on the second drive device side. (3)

[0176] The liquid ejecting head according to (1) or (2) above, wherein:

[0177] The line lengths of the one or more third transmission lines are each a value less than 1 / 4 of a signal wavelength obtained from a transmission frequency of the transmission data. (4)

[0179] The liquid ejecting head according to any one of (1) to (3) above, wherein:

[0180] At least one of the first to third terminal resistors is disposed inside the driving device. (5)

[0182] A liquid jet recording apparatus includes the liquid jet head described in any one of (1) to (4) above.

[0183] Explanation of symbols

[0184] 1, 1A-1C... inkjet head, 10... connector, 11... ejection unit, 111... actuator plate, 112... nozzle plate, 12... I / F substrate, 120a, 120b, 120c, 120d... connector, 121... circuit configuration area, 13a, 13b, 13c, 13d, 13A-13C... flexible substrate, 130... connection electrode, 141, 142... cooling unit, 2... printing control unit, 3... ink tank, 30... ink supply tube, 41, 41D1, 41D2... driving device, 411... first driving device, 415... second driving device, 412-414... third driving device, 4 33...crimping electrode, 5...printer, 9...ink, P...recording paper, Hn...nozzle hole, Dt...transmission data, Sc...printing control signal, Sd...driving signal, Vd...driving voltage, S1...surface, S2...back side, Tin1...first input terminal, Tin2...second input terminal, Tio1...first input-output unit, Tio2...second input-output unit, Lt1...first transmission line, Lt2...second transmission line, Lt31-Lt34...third transmission line, Rt...terminal resistor, Rt1...first terminal resistor, Rt2...second terminal resistor, Rt31-Rt34...third terminal resistor.

Claims

1. A liquid ejecting head, which is a liquid ejecting head for ejecting liquid and comprises: a spraying portion that sprays the liquid; and one or more driving substrates, which output a driving signal for causing the liquid to be ejected to the ejection portion, The driving substrate comprises: a first input terminal and a second input terminal which input transmission data transmitted from the outside of the liquid ejecting head; a plurality of drive devices arranged in series with each other between the first input terminal and the second input terminal, and generating the drive signal based on the transmission data input through one of the first input terminal and the second input terminal; a plurality of transmission lines which are arranged between the first input terminal and the second input terminal via the plurality of driving devices arranged in series with each other and transmit the transmission data; as well as a plurality of terminal resistors, which are arranged on the plurality of transmission lines; The plurality of drive devices respectively have a first input / output portion and a second input / output portion for inputting or outputting the transmission data, and The plurality of drive devices include: A first drive device located at one end of the series configuration; and a second drive device, which is located at the other end of the series configuration, The plurality of transmission lines include: a first transmission line connected between the first input terminal and the first input-output section in the first driving device; a second transmission line connected between the second input terminal and the second input-output section in the second driving device; as well as one or more third transmission lines connected between the second input-output section in the first driving device and the first input-output section in the second driving device, The liquid ejecting head is configured such that: the transmission data is exclusively inputted via one of the first input terminal and the second input terminal in the one or more driving substrates; and the transmission data can be bidirectionally inputted and outputted between the plurality of driving devices arranged in series between the first input terminal and the second input terminal, and the plurality of terminal resistors include: a first terminal resistor, which is arranged on the first transmission line near the first input / output portion of the first driving device; a second terminal resistor, which is arranged on the second transmission line near the second input-output unit in the second driving device; as well as A third terminal resistor is arranged at one of the vicinity of one end and the vicinity of the other end of each of the one or more third transmission lines.

2. The liquid ejecting head according to claim 1, in, The plurality of drive devices further include one or more third drive devices located between the first drive device and the second drive device in the series configuration, and The plurality of third transmission lines are connected between the second input / output unit in the first driving device and the first input / output unit in the second driving device via the one or more third driving devices. The third terminal resistors in each of the plurality of third transmission lines are alternately arranged near the end on the first drive device side and near the end on the second drive device side.

3. The liquid ejecting head according to claim 1 or claim 2, in, The line lengths of the one or more third transmission lines are each a value less than 1 / 4 of a signal wavelength obtained from a transmission frequency of the transmission data.

4. The liquid ejecting head according to claim 1 or claim 2, in, At least one of the first to third terminal resistors is disposed inside the driving device.

5. The liquid ejecting head according to claim 3, in, At least one of the first to third terminal resistors is disposed inside the driving device. 6 . A liquid jet recording apparatus comprising the liquid jet head according to claim 1 .

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