JP2020049934A - Print head control circuit, print head, and liquid discharge device - Google Patents

Abstract

To reduce the possibility that a self-diagnosis function of a print head is not executed normally.SOLUTION: A print head control circuit comprises: first, second, third and fourth diagnosis signal propagation wiring (197-23, 25, 21, 19) individually propagating first, second, third and fourth diagnosis signals (DIG-B, A, C, D); fifth diagnosis signal propagation wiring 197-11 propagating a fifth diagnosis signal DIG-E indicating a diagnostic result; first voltage signal propagation wiring 197-29 propagating a first voltage signal VDD1 supplied to a driving signal selecting circuit; and second voltage signal propagation wiring 197-24 propagating a second voltage signal VDD2. The fifth diagnosis signal propagation wiring and the second voltage signal propagation wiring are electrically connected via a fifth terminal 197-11 and a seventh terminal 353-24. The first diagnosis signal propagation wiring and the second diagnosis signal propagation wiring are positioned side-by-side, and, in an arrangement direction, the first diagnosis signal propagation wiring and the second voltage signal propagation wiring are positioned adjacently.SELECTED DRAWING: Figure 20

Description

  The present invention relates to a print head control circuit, a print head, and a liquid ejection device.

  A liquid discharge device such as an ink jet printer drives a piezoelectric element provided in a print head by a drive signal, thereby discharging a liquid such as ink filled in a cavity from a nozzle, and printing a character or image on a recording medium. Form. In such a liquid discharge apparatus, when a failure occurs in the print head, there is a possibility that a discharge abnormality may occur in which the liquid cannot be normally discharged from the nozzle. When such a discharge abnormality occurs, the discharge accuracy of the ink discharged from the nozzle may be reduced, and the quality of an image formed on the recording medium may be reduced.

  Patent Literature 1 has a self-diagnosis function of determining, by a head unit (print head) itself, whether or not a dot that satisfies normal print quality can be formed in accordance with a plurality of signals input to the print head. A printhead is disclosed.

JP, 2017-114020, A

  In the liquid ejecting apparatus described in Patent Document 1, when a waveform of a signal input to the print head for performing the self-diagnosis function is distorted, the self-diagnosis function of the print head may not be normally performed. Patent Document 1 does not disclose a technique for reducing the distortion of the waveform of a signal for performing the above-described self-diagnosis function.

One embodiment of the print head control circuit according to the present invention includes:
A driving element for discharging a liquid from a nozzle by driving based on a driving signal,
A drive signal selection circuit that controls supply of the drive signal to the drive element,
A first terminal;
A second terminal;
A third terminal;
A fourth terminal;
A fifth terminal;
A sixth terminal;
A seventh terminal;
A first diagnostic signal input to the first terminal, a second diagnostic signal input to the second terminal, a third diagnostic signal input to the third terminal, and a fourth diagnostic signal input to the fourth terminal. A diagnostic circuit for diagnosing whether normal ejection of liquid is possible based on the diagnostic signal;
A printhead control circuit for controlling the operation of a printhead having
First diagnostic signal propagation wiring for transmitting the first diagnostic signal;
A second diagnostic signal propagation wiring for transmitting the second diagnostic signal;
A third diagnostic signal propagation wiring for transmitting the third diagnostic signal;
A fourth diagnostic signal propagation wiring for transmitting the fourth diagnostic signal;
A fifth diagnostic signal input to the fifth terminal for transmitting a fifth diagnostic signal indicating a diagnostic result of the diagnostic circuit;
Diagnostic signal propagation wiring;
A first voltage signal transmission line for transmitting a first voltage signal input to the sixth terminal and supplied to the drive signal selection circuit;
A second voltage signal transmission line for transmitting a second voltage signal input to the seventh terminal;
A diagnostic signal output circuit that outputs the first diagnostic signal, the second diagnostic signal, the third diagnostic signal, and the fourth diagnostic signal;
A drive signal output circuit that outputs the drive signal;
With
When the fifth diagnostic signal transmission line and the second voltage signal transmission line are electrically connected to the print head, the fifth diagnosis signal transmission line and the second voltage signal transmission line Electrically connected through five terminals and the seventh terminal,
The first diagnostic signal propagation wiring and the second diagnostic signal propagation wiring are located side by side,
The first diagnostic signal transmission line and the second voltage signal transmission line are located adjacent to each other in the direction in which the first diagnosis signal transmission line and the second diagnosis signal transmission line are arranged.

One embodiment of the print head control circuit according to the present invention includes:
A driving element for discharging a liquid from a nozzle by driving based on a driving signal,
A drive signal selection circuit that controls supply of the drive signal to the drive element,
A first terminal;
A second terminal;
A third terminal;
A fourth terminal;
A fifth terminal;
A sixth terminal;
A seventh terminal;
A first diagnostic signal input to the first terminal, a second diagnostic signal input to the second terminal, a third diagnostic signal input to the third terminal, and a fourth diagnostic signal input to the fourth terminal. A diagnostic circuit for diagnosing whether normal ejection of liquid is possible based on the diagnostic signal;
A printhead control circuit for controlling the operation of the printhead comprising:
First diagnostic signal propagation wiring for transmitting the first diagnostic signal;
A second diagnostic signal propagation wiring for transmitting the second diagnostic signal;
A third diagnostic signal propagation wiring for transmitting the third diagnostic signal;
A fourth diagnostic signal propagation wiring for transmitting the fourth diagnostic signal;
A fifth diagnostic signal propagation wiring that is input to the fifth terminal and propagates a fifth diagnostic signal indicating a diagnostic result of the diagnostic circuit;
A first voltage signal transmission line for transmitting a first voltage signal input to the sixth terminal and supplied to the drive signal selection circuit;
A second voltage signal transmission line for transmitting a second voltage signal input to the seventh terminal;
A diagnostic signal output circuit that outputs the first diagnostic signal, the second diagnostic signal, the third diagnostic signal, and the fourth diagnostic signal;
A drive signal output circuit that outputs the drive signal;
With
When the fifth diagnostic signal transmission line and the second voltage signal transmission line are electrically connected to the print head, the fifth diagnosis signal transmission line and the second voltage signal transmission line Electrically connected through five terminals and the seventh terminal,
The first diagnostic signal propagation wiring and the second diagnostic signal propagation wiring are located side by side,
In the direction intersecting with the direction in which the first diagnostic signal propagation wiring and the second diagnostic signal propagation wiring are arranged, the first diagnostic signal propagation wiring and the second voltage signal propagation wiring partially overlap each other. .

In one embodiment of the print head control circuit,
The fifth diagnostic signal propagation wiring may also serve as a wiring for transmitting a signal indicating the presence or absence of a temperature abnormality of the print head.

In one embodiment of the print head control circuit,
A first ground signal transmission line for transmitting a ground signal;
The first diagnostic signal transmission line and the first ground signal transmission line may be located adjacent to each other in a direction in which the first diagnosis signal transmission line and the second diagnosis signal transmission line are arranged.

In one embodiment of the print head control circuit,
A third voltage signal transmission line for transmitting a third voltage signal having a voltage value larger than the first voltage signal;
In the direction in which the first diagnostic signal propagation wiring and the second diagnostic signal propagation wiring are arranged, the second voltage signal propagation wiring and the third voltage signal propagation wiring do not have to be located adjacent to each other.

In one embodiment of the print head control circuit,
A third voltage signal transmission line for transmitting a third voltage signal having a voltage value larger than the first voltage signal;
In the direction orthogonal to the direction in which the first diagnostic signal transmission wiring and the second diagnosis signal transmission wiring are arranged, the second voltage signal transmission wiring and the third voltage signal transmission wiring do not need to overlap and be located. Good.

In one embodiment of the print head control circuit,
A second ground signal transmission line for transmitting a ground signal;
The third voltage signal transmission line and the second ground signal transmission line may be located adjacent to each other in a direction in which the first diagnosis signal transmission line and the second diagnosis signal transmission line are arranged.

In one embodiment of the print head control circuit,
A second ground signal transmission line for transmitting a ground signal;
The third voltage signal transmission line and the second ground signal transmission line partially overlap each other in a direction intersecting a direction in which the first diagnosis signal transmission line and the second diagnosis signal transmission line are arranged. You may.

In one embodiment of the print head control circuit,
The print head has a first connector including the first terminal, the second terminal, the third terminal, the fourth terminal, and the fifth terminal, and a substrate,
The first connector and the diagnostic circuit are provided on the same surface of the board,
The first diagnostic signal propagation wiring, the second diagnostic signal propagation wiring, the third diagnostic signal propagation wiring, the fourth diagnostic signal propagation wiring, and the fifth diagnostic signal propagation wiring are provided on the same cable,
The cable may be electrically connected to the first connector.

In one embodiment of the print head control circuit,
The first diagnostic signal propagation wiring may also serve as a wiring for transmitting a clock signal.

In one embodiment of the print head control circuit,
The second diagnostic signal propagation wiring may also serve as a wiring for transmitting a signal defining a liquid ejection timing.

In one embodiment of the print head control circuit,
The third diagnostic signal propagation wiring may also serve as a wiring for transmitting a signal defining a waveform switching timing of the drive signal.

In one embodiment of the print head control circuit,
The fourth diagnostic signal propagation wiring may also serve as a wiring for transmitting a signal defining a waveform selection of the drive signal.

One aspect of the print head according to the present invention is:
A driving element for discharging a liquid from a nozzle by driving based on a driving signal,
A drive signal selection circuit that controls supply of the drive signal to the drive element,
A diagnostic circuit for diagnosing whether or not normal ejection of liquid is possible based on the first diagnostic signal, the second diagnostic signal, the third diagnostic signal, and the fourth diagnostic signal;
A first terminal to which the first diagnostic signal is input;
A second terminal to which the second diagnostic signal is input;
A third terminal to which the third diagnostic signal is input;
A fourth terminal to which the fourth diagnostic signal is input;
A fifth terminal to which a fifth diagnostic signal indicating a diagnostic result of the diagnostic circuit is input;
A sixth terminal to which a first voltage signal supplied to the drive signal selection circuit is input;
A seventh terminal to which the second voltage signal is input;
With
The fifth terminal and the seventh terminal are electrically connected,
The first terminal and the second terminal are located side by side,
In the direction in which the first terminal and the second terminal are arranged, the first terminal and the seventh terminal are located adjacent to each other.

One aspect of the print head according to the present invention is:
A driving element for discharging a liquid from a nozzle by driving based on a driving signal,
A drive signal selection circuit that controls supply of the drive signal to the drive element,
A diagnostic circuit for diagnosing whether or not normal ejection of liquid is possible based on the first diagnostic signal, the second diagnostic signal, the third diagnostic signal, and the fourth diagnostic signal;
A first terminal to which the first diagnostic signal is input;
A second terminal to which the second diagnostic signal is input;
A third terminal to which the third diagnostic signal is input;
A fourth terminal to which the fourth diagnostic signal is input;
A fifth terminal to which a fifth diagnostic signal indicating a diagnostic result of the diagnostic circuit is input;
A sixth terminal to which a first voltage signal supplied to the drive signal selection circuit is input;
A seventh terminal to which the second voltage signal is input;
With
The fifth terminal and the seventh terminal are electrically connected,
The first terminal and the second terminal are located side by side,
The first terminal and the seventh terminal are partially overlapped with each other in a direction intersecting a direction in which the first terminal and the second terminal are arranged.

In one aspect of the print head,
Equipped with a temperature abnormality detection circuit to diagnose the presence or absence of temperature abnormality,
The fifth terminal may also serve as a wiring for transmitting a signal indicating the presence or absence of the temperature abnormality.

In one aspect of the print head,
A first ground terminal to which a ground signal is input;
In the direction in which the first terminal and the second terminal are arranged, the first terminal and the first ground terminal may be located adjacent to each other.

In one aspect of the print head,
An eighth terminal to which a third voltage signal having a voltage value larger than the first voltage signal is input;
In the direction in which the first terminal and the second terminal are arranged, the seventh terminal and the eighth terminal do not have to be located adjacent to each other.

In one aspect of the print head,
An eighth terminal to which a third voltage signal having a voltage value larger than the first voltage signal is input;
In a direction orthogonal to the direction in which the first terminal and the second terminal are arranged, the seventh terminal and the eighth terminal do not have to be positioned so as to overlap.

In one aspect of the print head,
A second ground terminal to which a ground signal is input;
In the direction in which the first terminal and the second terminal are arranged, the eighth terminal and the second ground terminal may be located adjacent to each other.

In one aspect of the print head,
A second ground terminal to which a ground signal is input;
The eighth terminal and the second ground terminal may partially overlap each other in a direction intersecting a direction in which the first terminal and the second terminal are arranged.

In one aspect of the print head,
A first connector including the first terminal, the second terminal, the third terminal, the fourth terminal, and the fifth terminal;
Board and
With
The first connector and the diagnostic circuit may be provided on the same surface of the board.

In one aspect of the print head,
The first terminal may also serve as a terminal to which a clock signal is input.

In one aspect of the print head,
The second terminal may also serve as a terminal to which a signal defining a liquid ejection timing is input.

In one aspect of the print head,
The third terminal may also serve as a terminal to which a signal defining a waveform switching timing of the drive signal is input.

In one aspect of the print head,
The fourth terminal may also serve as a terminal to which a signal that defines waveform selection of the drive signal is input.

One embodiment of the liquid ejection device according to the present invention includes:
A print head,
A print head control circuit for controlling the operation of the print head,
With
The print head includes:
A driving element for discharging a liquid from a nozzle by driving based on a driving signal,
A drive signal selection circuit that controls supply of the drive signal to the drive element,
A diagnostic circuit for diagnosing whether or not normal ejection of liquid is possible based on the first diagnostic signal, the second diagnostic signal, the third diagnostic signal, and the fourth diagnostic signal;
A first terminal to which the first diagnostic signal is input;
A second terminal to which the second diagnostic signal is input;
A third terminal to which the third diagnostic signal is input;
A fourth terminal to which the fourth diagnostic signal is input;
A fifth terminal to which a fifth diagnostic signal indicating a diagnostic result of the diagnostic circuit is input;
A sixth terminal to which a first voltage signal supplied to the drive signal selection circuit is input;
A seventh terminal to which the second voltage signal is input;
Has,
The print head control circuit includes:
First diagnostic signal propagation wiring for transmitting the first diagnostic signal;
A second diagnostic signal propagation wiring for transmitting the second diagnostic signal;
A third diagnostic signal propagation wiring for transmitting the third diagnostic signal;
A fourth diagnostic signal propagation wiring for transmitting the fourth diagnostic signal;
A fifth diagnostic signal propagation wiring for transmitting the fifth diagnostic signal;
A first voltage signal transmission line for transmitting the first voltage signal;
A second voltage signal transmission line for transmitting the second voltage signal;
A diagnostic signal output circuit that outputs the first diagnostic signal, the second diagnostic signal, the third diagnostic signal, and the fourth diagnostic signal;
A drive signal output circuit that outputs the drive signal;
Has,
The first diagnostic signal transmission wiring and the first terminal are electrically contacted at a first contact portion;
The second diagnostic signal propagation wiring and the second terminal are electrically contacted at a second contact portion,
The third diagnostic signal transmission wiring and the third terminal are electrically contacted at a third contact portion,
The fourth diagnostic signal transmission wiring and the fourth terminal are electrically contacted at a fourth contact portion,
The fifth diagnostic signal transmission wiring and the fifth terminal are electrically connected at a fifth contact portion,
The first voltage signal transmission wiring and the sixth terminal are electrically contacted at a sixth contact portion,
The second voltage signal transmission wiring and the seventh terminal are electrically contacted at a seventh contact portion,
The fifth diagnostic signal propagation wiring and the second voltage signal propagation wiring are electrically connected via the fifth terminal, the fifth contact portion, the seventh contact portion, and the seventh terminal,
The first contact portion and the second contact portion are located side by side,
In the direction in which the first contact portion and the second contact portion are arranged, the first contact portion and the seventh contact portion are located adjacent to each other.

One embodiment of the liquid ejection device according to the present invention includes:
A print head,
A print head control circuit for controlling the operation of the print head,
With
The print head includes:
A driving element for discharging a liquid from a nozzle by driving based on a driving signal,
A drive signal selection circuit that controls supply of the drive signal to the drive element,
A diagnostic circuit for diagnosing whether or not normal ejection of liquid is possible based on the first diagnostic signal, the second diagnostic signal, the third diagnostic signal, and the fourth diagnostic signal;
A first terminal to which the first diagnostic signal is input;
A second terminal to which the second diagnostic signal is input;
A third terminal to which the third diagnostic signal is input;
A fourth terminal to which the fourth diagnostic signal is input;
A fifth terminal to which a fifth diagnostic signal indicating a diagnostic result of the diagnostic circuit is input;
A sixth terminal to which a first voltage signal supplied to the drive signal selection circuit is input;
A seventh terminal to which the second voltage signal is input;
Has,
The print head control circuit includes:
First diagnostic signal propagation wiring for transmitting the first diagnostic signal;
A second diagnostic signal propagation wiring for transmitting the second diagnostic signal;
A third diagnostic signal propagation wiring for transmitting the third diagnostic signal;
A fourth diagnostic signal propagation wiring for transmitting the fourth diagnostic signal;
A fifth diagnostic signal propagation wiring for transmitting the fifth diagnostic signal;
A first voltage signal transmission line for transmitting the first voltage signal;
A second voltage signal transmission line for transmitting the second voltage signal;
A diagnostic signal output circuit that outputs the first diagnostic signal, the second diagnostic signal, the third diagnostic signal, and the fourth diagnostic signal;
A drive signal output circuit that outputs the drive signal;
Has,
The first diagnostic signal transmission wiring and the first terminal are electrically contacted at a first contact portion;
The second diagnostic signal propagation wiring and the second terminal are electrically contacted at a second contact portion,
The third diagnostic signal transmission wiring and the third terminal are electrically contacted at a third contact portion,
The fourth diagnostic signal transmission wiring and the fourth terminal are electrically contacted at a fourth contact portion,
The fifth diagnostic signal transmission wiring and the fifth terminal are electrically connected at a fifth contact portion,
The first voltage signal transmission wiring and the sixth terminal are electrically contacted at a sixth contact portion,
The second voltage signal transmission wiring and the seventh terminal are electrically contacted at a seventh contact portion,
The fifth diagnostic signal propagation wiring and the second voltage signal propagation wiring are electrically connected via the fifth terminal, the fifth contact portion, the seventh contact portion, and the seventh terminal,
In the direction intersecting with the direction in which the first contact portion and the second contact portion are arranged, the first contact portion and the seventh contact portion partially overlap each other.

In one embodiment of the liquid ejection device,
The print head has a temperature abnormality detection circuit for diagnosing the presence or absence of a temperature abnormality,
The fifth diagnostic signal propagation wiring may also serve as a wiring for transmitting a signal indicating the presence or absence of the temperature abnormality.

In one embodiment of the liquid ejection device,
The print head has a first ground terminal to which a ground signal is input,
The printhead control circuit has a first ground signal transmission line for transmitting a ground signal,
The first ground signal transmission line and the first ground terminal are electrically connected at a first ground contact portion,
The first contact portion and the first ground contact portion may be located adjacent to each other in a direction in which the first contact portion and the second contact portion are arranged.

In one embodiment of the liquid ejection device,
The print head has an eighth terminal to which a third voltage signal having a voltage value larger than the first voltage signal is input,
The print head control circuit has a third voltage signal transmission line for transmitting the third voltage signal,
The third voltage signal transmission wiring and the eighth terminal are electrically connected at an eighth contact portion,
In the direction in which the first contact portion and the second contact portion are arranged, the seventh contact portion and the eighth contact portion do not have to be located adjacent to each other.

In one embodiment of the liquid ejection device,
The print head has an eighth terminal to which a third voltage signal having a voltage value larger than the first voltage signal is input,
The print head control circuit has a third voltage signal transmission line for transmitting the third voltage signal,
The third voltage signal transmission wiring and the eighth terminal are electrically connected at an eighth contact portion,
In the direction orthogonal to the direction in which the first contact portion and the second contact portion are arranged, the seventh contact portion and the eighth contact portion do not have to overlap each other.

In one embodiment of the liquid ejection device,
The print head has a second ground terminal to which a ground signal is input,
The print head control circuit has a second ground signal transmission line for transmitting a ground signal,
The second ground signal transmission line and the second ground terminal are electrically connected at a second ground contact portion,
The eighth contact portion and the second ground contact portion may be located adjacent to each other in a direction in which the first contact portion and the second contact portion are arranged.

In one embodiment of the liquid ejection device,
The print head has a second ground terminal to which a ground signal is input,
The print head control circuit has a second ground signal transmission line for transmitting a ground signal,
The second ground signal transmission line and the second ground terminal are electrically connected at a second ground contact portion,
The eighth contact portion and the second ground contact portion may partially overlap each other in a direction intersecting a direction in which the first contact portion and the second contact portion are arranged.

In one embodiment of the liquid ejection device,
The print head includes a first connector having the first terminal, the second terminal, the third terminal, the fourth terminal, and the fifth terminal, and a substrate,
The first connector and the diagnostic circuit are provided on the same surface of the board,
The first diagnostic signal propagation wiring, the second diagnostic signal propagation wiring, the third diagnostic signal propagation wiring, the fourth diagnostic signal propagation wiring, and the fifth diagnostic signal propagation wiring are provided on the same cable,
The cable may be electrically connected to the first connector.

In one embodiment of the liquid ejection device,
The first diagnostic signal propagation wiring may also serve as a wiring for transmitting a clock signal.

In one embodiment of the liquid ejection device,
The second diagnostic signal propagation wiring may also serve as a wiring for transmitting a signal defining a liquid ejection timing.

In one embodiment of the liquid ejection device,
The third diagnostic signal propagation wiring may also serve as a wiring for transmitting a signal defining a waveform switching timing of the drive signal.

In one embodiment of the liquid ejection device,
The fourth diagnostic signal propagation wiring may also serve as a wiring for transmitting a signal defining a waveform selection of the drive signal.

FIG. 2 is a diagram illustrating a schematic configuration of a liquid ejection device. FIG. 3 is a block diagram illustrating an electrical configuration of the liquid ejection device. FIG. 4 is a diagram illustrating an example of a waveform of a drive signal COM. FIG. 3 is a diagram illustrating an example of a waveform of a drive signal VOUT. FIG. 3 is a diagram illustrating a configuration of a drive signal selection circuit. It is a figure which shows the decoding content in a decoder. FIG. 4 is a diagram illustrating a configuration of a selection circuit corresponding to one ejection unit. FIG. 4 is a diagram for explaining an operation of a drive signal selection circuit. FIG. 3 is a diagram illustrating a configuration of a temperature abnormality detection circuit. FIG. 4 is a diagram schematically illustrating an internal configuration of the liquid ejection device when viewed from a Y direction. It is a figure showing composition of a cable. FIG. 2 is a perspective view illustrating a configuration of a print head. FIG. 3 is a plan view illustrating a configuration of an ink ejection surface. FIG. 3 is a diagram illustrating a schematic configuration of one of a plurality of ejection units included in a head. FIG. 3 is a plan view when the substrate is viewed from a surface 322. FIG. 3 is a plan view when the substrate is viewed from a surface 321. FIG. 3 is a diagram showing a configuration of a connector 350. FIG. 14 is a diagram showing another configuration of the connector 350. FIG. 4 is a diagram for explaining a specific example when a cable is attached to a connector. FIG. 3 is a diagram for explaining details of a signal propagated through a cable 19; It is a figure which shows roughly the internal structure when the liquid discharge device in 2nd Embodiment is seen from Y direction. FIG. 9 is a perspective view illustrating a configuration of a print head according to a second embodiment. It is a figure showing composition of connectors 350 and 360 in a 2nd embodiment. FIG. 11 is a diagram for explaining details of a signal transmitted through a cable 19a in the second embodiment. FIG. 11 is a diagram for explaining details of a signal propagated by a cable 19b in the second embodiment. It is a block diagram showing an electric composition of a liquid discharge device in a 3rd embodiment. It is a figure which shows roughly the internal structure when the liquid discharge device in 3rd Embodiment is seen from Y direction. FIG. 11 is a perspective view illustrating a configuration of a print head 21 according to a third embodiment. It is a figure showing composition of connectors 370 and 380 in a 3rd embodiment. FIG. 14 is a diagram for explaining details of a signal transmitted through a cable 19a in the third embodiment. FIG. 14 is a diagram for explaining details of a signal propagated by a cable 19b in the third embodiment. It is a figure for explaining the detail of the signal propagated by cable 19c in a 3rd embodiment. It is a figure for explaining the detail of the signal propagated by cable 19d in a 3rd embodiment.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. The drawings used are for convenience of explanation. The embodiments described below do not unduly limit the contents of the present invention described in the claims. In addition, all of the configurations described below are not necessarily essential components of the invention.

1. First Embodiment 1.1 Outline of Liquid Discharge Apparatus FIG. 1 is a diagram showing a schematic configuration of a liquid discharge apparatus 1. The liquid ejecting apparatus 1 is configured such that a carriage 20 on which a print head 21 that ejects ink as an example of a liquid reciprocates and ejects ink to a medium P to be conveyed, thereby forming an image on the medium P. This is a serial printing type ink jet printer that forms a. In the following description, the direction in which the carriage 20 moves is described as the X direction, the direction in which the medium P is transported is the Y direction, and the direction in which ink is ejected is the Z direction. Note that the X direction, the Y direction, and the Z direction are described as directions orthogonal to each other. Further, as the medium P, any printing target such as printing paper, resin film, cloth, etc. can be used.

  The liquid ejection device 1 includes a liquid container 2, a control mechanism 10, a carriage 20, a moving mechanism 30, and a transport mechanism 40.

  The liquid container 2 stores a plurality of types of ink ejected to the medium P. The colors of the ink stored in the liquid container 2 include black, cyan, magenta, yellow, red, and gray. As the liquid container 2 storing such ink, an ink cartridge, a bag-like ink pack formed of a flexible film, an ink tank capable of replenishing ink, and the like are used.

  The control mechanism 10 includes a processing circuit such as a CPU (Central Processing Unit) or an FPGA (Field Programmable Gate Array) and a storage circuit such as a semiconductor memory, and controls each element of the liquid ejection device 1.

  A print head 21 is mounted on the carriage 20. The carriage 20 is fixed to an endless belt 32 included in the moving mechanism 30. Note that the liquid container 2 may also be mounted on the carriage 20.

  The control signal Ctrl-H for controlling the print head 21 and one or a plurality of drive signals COM for driving the print head 21 output from the control mechanism 10 are input to the print head 21. Then, the print head 21 discharges the ink supplied from the liquid container 2 based on the control signal Ctrl-H and the drive signal COM.

  The moving mechanism 30 includes a carriage motor 31 and an endless belt 32. The carriage motor 31 operates based on a control signal Ctrl-C input from the control mechanism 10. The endless belt 32 rotates according to the operation of the carriage motor 31. As a result, the carriage 20 fixed to the endless belt 32 reciprocates in the X direction.

  The transport mechanism 40 includes a transport motor 41 and a transport roller 42. The transport motor 41 operates based on a control signal Ctrl-T input from the control mechanism 10. The transport roller 42 rotates according to the operation of the transport motor 41. The medium P is transported in the Y direction with the rotation of the transport roller 42.

As described above, the liquid ejection device 1 ejects ink from the print head 21 mounted on the carriage 20 in conjunction with the conveyance of the medium P by the conveyance mechanism 40 and the reciprocation of the carriage 20 by the movement mechanism 30. Then, ink is landed at an arbitrary position on the surface of the medium P, and a desired image is formed on the medium P.

1.2 Electrical Configuration of Liquid Discharge Apparatus FIG. 2 is a block diagram showing an electrical configuration of the liquid discharge apparatus 1. The liquid ejection device 1 includes a control mechanism 10, a print head 21, a carriage motor 31, a transport motor 41, and a linear encoder 90.

  The control mechanism 10 includes a drive signal output circuit 50, a control circuit 100, and a power supply circuit 110. The control circuit 100 includes, for example, a processor such as a microcontroller. The control circuit 100 generates and outputs data and various signals for controlling the liquid ejecting apparatus 1 based on various signals such as image data input from the host computer.

  Specifically, the control circuit 100 grasps the scanning position of the print head 21 based on the detection signal input from the linear encoder 90. Then, the control circuit 100 generates and outputs various signals according to the scanning position of the print head 21. More specifically, the control circuit 100 generates a control signal Ctrl-C for controlling the reciprocation of the print head 21 and outputs the control signal Ctrl-C to the carriage motor 31. Further, the control circuit 100 generates a control signal Ctrl-T for controlling the transport of the medium P, and outputs the control signal Ctrl-T to the transport motor 41. The control signal Ctrl-C may be converted into a signal via a carriage motor driver (not shown) and then input to the carriage motor 31. Similarly, the control signal Ctrl-T may be input to the carriage motor driver (not shown). May be input to the transport motor 41 after the signal conversion.

  The control circuit 100 also generates a print data signal SI1 as a control signal Ctrl-H for controlling the print head 21 based on various signals such as image data input from the host computer and the scanning position of the print head 21. ＳSIn, a change signal CH, a latch signal LAT, and a clock signal SCK are generated and output to the print head 21.

  Further, the control circuit 100 generates diagnostic signals DIG-A to DIG-D for diagnosing whether or not the print head 21 can normally discharge the liquid, and outputs the generated diagnostic signals to the print head 21. Here, although details will be described later, in the liquid ejection apparatus 1 according to the first embodiment, each of the diagnostic signals DIG-A to DIG-D and each of the latch signal LAT, the clock signal SCK, the change signal CH, and the print data signal SI1 Is transmitted to the print head 21 by common wiring. More specifically, the diagnostic signal DIG-A and the latch signal LAT are transmitted on a common line, the diagnostic signal DIG-B and the clock signal SCK are transmitted on a common line, and the diagnostic signal DIG-C and the change signal CH are transmitted. Are transmitted over a common line, and the diagnostic signal DIG-D and the print data signal SI1 are transmitted over a common line. Here, the control circuit 100 is an example of a diagnostic signal output circuit that generates the diagnostic signals DIG-A to DIG-D and outputs the diagnostic signals to the print head 21.

  Further, the control circuit 100 outputs a drive control signal dA, which is a digital signal, to the drive signal output circuit 50.

Drive signal output circuit 50 includes a drive circuit 50a. The drive control signal dA is input to the drive circuit 50a. The drive circuit 50a converts the drive control signal dA into a digital / analog signal, and then class-D amplifies the converted analog signal to generate a drive signal COM. That is, the drive control signal dA is a digital signal that defines the waveform of the drive signal COM, and the drive circuit 50a generates the drive signal COM by class-D amplifying the waveform defined by the drive control signal dA. Then, the drive signal output circuit 50 outputs the drive signal COM generated by the drive circuit 50a. Therefore, the drive control signal dA may be any signal that can define the waveform of the drive signal COM. For example, the drive control signal dA may be an analog signal. Note that the drive circuit 50a only needs to be able to amplify a waveform defined by the drive control signal dA, and may be configured by, for example, a class A amplifier circuit, a class B amplifier circuit, or a class AB amplifier circuit.

  The drive signal output circuit 50 outputs a reference voltage signal CGND indicating a reference potential of the drive signal COM. The reference voltage signal CGND may be, for example, a signal of a ground potential having a voltage value of 0 V, or a signal of a DC voltage having a voltage value of 6 V or the like.

  The drive signal COM and the reference voltage signal CGND are output to the print head 21 after being branched in the control mechanism 10. Specifically, the drive signal COM is branched to n drive signals COM1 to COMn corresponding to each of n drive signal selection circuits 200 described later in the control mechanism 10, and then output to the print head 21. . Similarly, the reference voltage signal CGND is branched into n reference voltage signals CGND <b> 1 to CGNDn by the control mechanism 10 and then output to the print head 21. The drive signal COM including the drive signals COM1 to COMn is an example of the drive signal.

  The power supply circuit 110 generates and outputs voltages VHV, VDD1, VDD2 and a ground signal GND. The voltage VHV is a DC voltage signal having a voltage value of, for example, 42V. The voltages VDD1 and VDD2 are DC voltage signals having a voltage value of, for example, 3.3 V. The ground signal GND is a signal indicating a reference potential of the voltages VHV, VDD1 and VDD2, and is, for example, a signal of a ground potential having a voltage value of 0V. The voltage VHV is used as a voltage for amplification in the drive signal output circuit 50 and the like. Further, each of the voltages VDD1 and VDD2 is used for a power supply voltage, a control voltage, and the like of various components in the control mechanism 10. The voltages VHV, VDD1, VDD2 and the ground signal GND are also output to the print head 21. Note that the voltage values of the voltages VHV, VDD1, VDD2 and the ground signal GND are not limited to the above-mentioned 42V, 3.3V and 0V. Further, the power supply circuit 110 may generate a signal having a plurality of voltage values other than the voltages VHV, VDD1, VDD2 and the ground signal GND.

  The print head 21 includes drive signal selection circuits 200-1 to 200-n, a temperature detection circuit 210, a diagnosis circuit 240, temperature abnormality detection circuits 250-1 to 250-n, and a plurality of ejection units 600. .

  The diagnostic circuit 240 prints the diagnostic signal DIG-A and the latch signal LAT, the diagnostic signal DIG-B and the clock signal SCK, the diagnostic signal DIG-C and the change signal CH, and the diagnostic signal DIG-D propagated through the common wiring. The data signal SI1 is input. Then, the diagnosis circuit 240 diagnoses whether or not normal ejection of the ink is possible based on the diagnosis signals DIG-A to DIG-D.

  For example, the diagnostic circuit 240 detects whether the voltage values of any of the input diagnostic signals DIG-A to DIG-D or all the signals are normal, and based on the detection result, Thus, it may be diagnosed whether the print head 21 and the control mechanism 10 are normally connected. The diagnostic circuit 240 is configured to drive the drive signal selecting circuit included in the print head 21 according to any one of the input diagnostic signals DIG-A to DIG-D or a combination of the logic levels of all the signals. 200-1 to 200-n and the arbitrary configuration such as the piezoelectric element 60 are operated to detect whether or not the voltage value resulting from the operation is normal, and based on the detection result, the print head 21 is operated normally. It may be diagnosed whether or not operation is possible. That is, the print head 21 performs a self-diagnosis based on the diagnosis result of the diagnosis circuit 240 as to whether or not normal ejection of ink is possible.

  When the diagnostic circuit 240 determines that the ink can be normally ejected from the print head 21, the diagnostic circuit 240 converts the latch signal LAT, the clock signal SCK, and the change signal CH into the latch signal cLAT, the clock signal cSCK, and the change signal. Output as signal cCH. Here, after the diagnostic signal DIG-D and the print data signal SI1 are branched in the print head 21, one of the branched signals is input to the diagnostic circuit 240, and the other is input to the drive signal selecting circuit 200-1. The print data signal SI1 is a signal having a high transfer rate. If the waveform of the print data signal SI1 is distorted, the print head 21 may malfunction. By branching the print data signal SI1 at the print head 21 and then inputting only one of them to the diagnostic circuit 240, the possibility of distortion occurring in the waveform of the print data signal SI1 input to the drive signal selection circuit 200-1 is reduced. Can be reduced.

  The change signal cCH, the latch signal cLAT, and the clock signal cSCK output from the diagnostic circuit 240 may have the same waveform as the change signal CH, the latch signal LAT, and the clock signal SCK input to the diagnostic circuit 240. Further, the change signal cCH, the latch signal cLAT, and the clock signal cSCK may be signals having waveforms obtained by correcting the change signal CH, the latch signal LAT, and the clock signal SCK. In the present embodiment, the description will be given on the assumption that the change signal cCH, the latch signal cLAT, and the clock signal cSCK have the same waveforms as the change signal CH, the latch signal LAT, and the clock signal SCK.

  Further, the diagnostic circuit 240 generates a diagnostic signal DIG-E indicating a diagnostic result in the diagnostic circuit 240 and outputs it to the control circuit 100. Here, the diagnostic circuit 240 in the first embodiment is configured as, for example, one or a plurality of integrated circuit (IC) devices.

  The drive signal selection circuits 200-1 to 200-n receive the voltages VHV, VDD1, the drive signals COM1 to COMn, the print data signals SI1 to SIn, the clock signal cSCK, the latch signal cLAT, and the change signal cCH. The voltages VHV and VDD1 are used as power supply voltages and control voltages of the drive signal selection circuits 200-1 to 200-n, respectively. Each of the drive signal selection circuits 200-1 to 200-n selects or deselects the drive signals COM1 to COMn based on the print data signals SI1 to SIn, the clock signal cSCK, the latch signal cLAT, and the change signal cCH. Thus, the drive signals VOUT1 to VOUTn are generated.

  The drive signals VOUT1 to VOUTn generated by the drive signal selection circuits 200-1 to 200-n are supplied to the corresponding piezoelectric elements 60, which are examples of the drive elements included in the ejection unit 600. The piezoelectric element 60 is displaced when the drive signals VOUT1 to VOUTn are supplied. Then, an amount of ink corresponding to the displacement is ejected from the ejection unit 600.

  Specifically, the drive signal selection circuit 200-1 receives the drive signal COM1, the print data signal SI1, the latch signal cLAT, the change signal cCH, and the clock signal cSCK. Then, the drive signal selection circuit 200-1 generates the drive signal VOUT1 by selecting or not selecting the waveform of the drive signal COM1 based on the print data signal SI1, the latch signal cLAT, the change signal cCH, and the clock signal cSCK. . The drive signal VOUT1 is supplied to one end of the piezoelectric element 60 of the ejection unit 600 provided correspondingly. The other end of the piezoelectric element 60 is supplied with a reference voltage signal CGND1. Then, the piezoelectric element 60 is displaced by a potential difference between the drive signal VOUT1 and the reference voltage signal CGND1.

Similarly, a drive signal COMi, a print data signal SIi, a latch signal cLAT, a change signal cCH, and a clock signal cSCK are input to the drive signal selection circuit 200-i (i is any one of 1 to n). Then, the drive signal selection circuit 200-i outputs the print data signal SIi
The drive signal VOUTi is generated by selecting or non-selecting the waveform of the drive signal COMi based on the latch signal cLAT, the change signal cCH, and the clock signal cSCK. The drive signal VOUTi is supplied to one end of the piezoelectric element 60 of the ejection unit 600 provided correspondingly. The other end of the piezoelectric element 60 is supplied with a reference voltage signal CGNDi. Then, the piezoelectric element 60 is displaced by a potential difference between the drive signal VOUTi and the reference voltage signal CGNDi.

  Here, each of drive signal selection circuits 200-1 to 200-n has a similar circuit configuration. Therefore, in the following description, when it is not necessary to distinguish the drive signal selection circuits 200-1 to 200-n, they are referred to as drive signal selection circuits 200. In this case, the drive signals COM1 to COMn input to the drive signal selection circuit 200 are referred to as drive signals COM, the print data signals SI1 to SIn are referred to as print data signals SI, and the drive signals output from the drive signal selection circuit 200. VOUT1 to VOUTn are referred to as drive signals VOUT. The details of the operation of the drive signal selection circuit 200 will be described later. Here, each of the drive signal selection circuits 200-1 to 200-i is configured as, for example, an integrated circuit device.

  Temperature abnormality detection circuits 250-1 to 250-n are provided corresponding to drive signal selection circuits 200-1 to 200-n, respectively. Then, the temperature abnormality detection circuits 250-1 to 250-n diagnose the presence or absence of the temperature abnormality of the corresponding drive signal selection circuits 200-1 to 200-n. Specifically, the temperature abnormality detection circuits 250-1 to 250-n operate using the voltage VDD2 as a power supply voltage. Then, each of the temperature abnormality detection circuits 250-1 to 250-n detects the temperature of the corresponding drive signal selection circuit 200-1 to 200-n, and when it is diagnosed that the temperature is normal, a high level ( An H signal (H level) is generated and output to the control circuit 100. On the other hand, when each of the temperature abnormality detection circuits 250-1 to 250-n diagnoses that the temperature of the corresponding drive signal selection circuit 200-1 to 200-n is abnormal, the low level (L level) abnormality signal XHOT is generated and output to the control circuit 100.

  Here, each of the temperature abnormality detection circuits 250-1 to 250-n has a similar circuit configuration. Therefore, in the following description, when it is not necessary to distinguish the temperature abnormality detection circuits 250-1 to 250-n, they are referred to as temperature abnormality detection circuits 250. Here, although the details will be described later, the diagnostic signal DIG-E and the abnormal signal XHOT are propagated by common wiring. The details of the temperature abnormality detection circuit 250 will be described later. Each of the temperature abnormality detection circuits 250-1 to 250-i is configured as, for example, an integrated circuit device. Further, the temperature abnormality detection circuit 250-i and the drive signal selection circuit 200-i may be configured as one integrated circuit device.

  The temperature detection circuit 210 includes a temperature detection element such as a thermistor. Then, the temperature detection circuit 210 generates a temperature signal TH of an analog signal including temperature information of the print head 21 based on the detection signal detected by the temperature detection element, and outputs the signal to the control circuit 100.

1.3 Example of Waveform of Drive Signal Here, an example of a waveform of the drive signal COM generated by the drive signal output circuit 50 and an example of a waveform of the drive signal VOUT supplied to the piezoelectric element 60 are shown in FIGS. This will be described with reference to FIG.

FIG. 3 is a diagram illustrating an example of the waveform of the drive signal COM. As shown in FIG. 3, the drive signal COM has a trapezoidal waveform Adp1 arranged in a period T1 from the rise of the latch signal LAT to the rise of the change signal CH, and the drive signal COM after the period T1 until the next rise of the change signal CH. And a trapezoidal waveform Adp3 arranged in a period T3 after the period T2 until the next rise of the latch signal LAT. When the trapezoidal waveform Adp1 is supplied to one end of the piezoelectric element 60, a medium amount of ink is ejected from the ejection unit 600 corresponding to the piezoelectric element 60. When the trapezoidal waveform Adp2 is supplied to one end of the piezoelectric element 60, a small amount of ink that is smaller than a medium amount is ejected from the ejection unit 600 corresponding to the piezoelectric element 60. Further, when the trapezoidal waveform Adp3 is supplied to one end of the piezoelectric element 60, no ink is ejected from the ejection unit 600 corresponding to the piezoelectric element 60. The trapezoidal waveform Adp3 is a waveform for finely vibrating the ink near the nozzle opening of the discharge unit 600 to prevent an increase in ink viscosity.

  Here, a cycle Ta from the rise of the latch signal LAT to the rise of the next latch signal LAT shown in FIG. 3 corresponds to a printing cycle for forming a new dot on the medium P. That is, the latch signal LAT and the latch signal cLAT are signals that define the ink ejection timing from the print head 21, and the change signal CH and the change signal cCH are the trapezoidal waveforms Adp1, Adp2, and Adp3 included in the drive signal COM. This signal defines the waveform switching timing.

  Further, the voltages at the start timing and the end timing of the trapezoidal waveforms Adp1, Adp2, Adp3 are all common to the voltage Vc. That is, each of the trapezoidal waveforms Adp1, Adp2, Adp3 is a waveform that starts at the voltage Vc and ends at the voltage Vc. The drive signal COM may be a signal having a waveform in which one or two trapezoidal waveforms are continuous in the cycle Ta, or a signal having a waveform in which four or more trapezoidal waveforms are continuous.

  FIG. 4 is a diagram illustrating an example of the waveform of the drive signal VOUT corresponding to each of “large dot”, “medium dot”, “small dot”, and “non-print”.

  As shown in FIG. 4, in the cycle Ta, the drive signal VOUT corresponding to the “large dot” has the trapezoidal waveform Adp1 arranged in the period T1, the trapezoidal waveform Adp2 arranged in the period T2, and the period T3. The voltage Vc is a waveform in which a constant waveform is continued. When the drive signal VOUT is supplied to one end of the piezoelectric element 60, a medium amount of ink and a small amount of ink are ejected from the ejection unit 600 corresponding to the piezoelectric element 60 in the cycle Ta. . Therefore, large dots are formed on the medium P by landing and uniting the respective inks.

  The drive signal VOUT corresponding to the “medium dot” is a waveform in which, in the cycle Ta, a trapezoidal waveform Adp1 arranged in the period T1 and a constant waveform with the voltage Vc arranged in the periods T2 and T3 are continuous. I have. When the drive signal VOUT is supplied to one end of the piezoelectric element 60, a medium amount of ink is ejected from the ejection unit 600 corresponding to the piezoelectric element 60 in the cycle Ta. Therefore, this ink lands on the medium P to form a medium dot.

  The drive signal VOUT corresponding to the “small dot” has a waveform in the cycle Ta, in which a constant waveform at the voltage Vc arranged in the periods T1 and T3 and a trapezoidal waveform Adp2 arranged in the period T2 are continuous. I have. When the drive signal VOUT is supplied to one end of the piezoelectric element 60, a small amount of ink is ejected from the ejection unit 600 corresponding to the piezoelectric element 60 in the cycle Ta. Therefore, small dots are formed on the medium P when this ink lands.

The drive signal VOUT corresponding to "non-recording" has a waveform in the cycle Ta in which a constant waveform at the voltage Vc arranged in the periods T1 and T2 and a trapezoidal waveform Adp3 arranged in the period T3 are continuous. I have. When the drive signal VOUT is supplied to one end of the piezoelectric element 60, the ink near the nozzle opening of the ejection unit 600 corresponding to the piezoelectric element 60 only slightly vibrates in the cycle Ta, and the ink is not ejected. Therefore, no dot is formed on the medium P without ink landing.

  Here, the waveform that is constant at the voltage Vc means that the voltage Vc immediately before is the voltage held by the capacitance component of the piezoelectric element 60 when none of the trapezoidal waveforms Adp1, Adp2, and Adp3 is selected as the drive signal VOUT. Waveform. Therefore, when none of the trapezoidal waveforms Adp1, Adp2, Adp3 is selected as the drive signal VOUT, the voltage Vc is supplied to the piezoelectric element 60 as the drive signal VOUT.

  The drive signal COM and the drive signal VOUT shown in FIGS. 3 and 4 are merely examples, and the moving speed of the carriage 20 on which the print head 21 is mounted, the physical properties of the ink supplied to the print head 21, and the medium P Depending on the material or the like, signals having various combinations of waveforms may be used.

1.4 Configuration of Drive Signal Selection Circuit Next, the configuration and operation of the drive signal selection circuit 200 will be described. FIG. 5 is a diagram showing a configuration of the drive signal selection circuit 200. As shown in FIG. 5, the drive signal selection circuit 200 includes a selection control circuit 220 and a plurality of selection circuits 230.

  The selection control circuit 220 receives the print data signal SI, the latch signal cLAT, the change signal cCH, and the clock signal cSCK. In the selection control circuit 220, a set of a shift register (S / R) 222, a latch circuit 224, and a decoder 226 is provided corresponding to each of the plurality of ejection units 600. That is, the drive signal selection circuit 200 includes the same number of sets of the shift register 222, the latch circuit 224, and the decoder 226 as the total number m of the corresponding ejection units 600. Here, the print data signal SI is a signal that defines the waveform selection of the drive signal COM, and the clock signal SCK and the clock signal cSCK are clock signals that define the timing at which the print data signal SI is input.

  Specifically, the print data signal SI is a signal synchronized with the clock signal cSCK, and for each of the m ejection units 600, “large dot”, “medium dot”, “small dot”, and “ This is a 2m-bit signal including 2-bit print data [SIH, SIL] for selecting any of "non-recording". The print data signal SI is stored in the shift register 222 for each print data [SIH, SIL] of 2 bits included in the print data signal SI corresponding to the ejection unit 600. Specifically, the m-stage shift registers 222 corresponding to the ejection units 600 are cascaded with each other, and the serially input print data signal SI is sequentially transferred to the subsequent stage according to the clock signal cSCK. In FIG. 5, in order to distinguish the shift register 222, the first stage, the second stage,...

  Each of the m latch circuits 224 latches the 2-bit print data [SIH, SIL] held by each of the m shift registers 222 at the rising edge of the latch signal cLAT.

  Each of the m decoders 226 decodes the 2-bit print data [SIH, SIL] latched by each of the m latch circuits 224. Then, the decoder 226 outputs the selection signal S for each of the periods T1, T2, and T3 defined by the latch signal cLAT and the change signal cCH.

FIG. 6 is a diagram showing the contents of decoding in the decoder 226. The decoder 226 outputs a selection signal S according to the latched 2-bit print data [SIH, SIL]. For example, when the 2-bit print data [SIH, SIL] is [1, 0], the decoder 226 outputs the logic level of the selection signal S as the H, H, L level in each of the periods T1, T2, T3. I do.

  The selection circuits 230 are provided corresponding to the respective ejection units 600. That is, the number of selection circuits 230 included in the drive signal selection circuit 200 is the same as the total number m of the corresponding ejection units 600. FIG. 7 is a diagram illustrating a configuration of the selection circuit 230 corresponding to one ejection unit 600. As shown in FIG. 7, the selection circuit 230 includes an inverter 232, which is a NOT circuit, and a transfer gate 234.

  The selection signal S is input to the positive control terminal not marked with a circle in the transfer gate 234, while being logically inverted by the inverter 232 and input to the negative control terminal marked with a circle in the transfer gate 234. You. Further, a drive signal COM is supplied to an input terminal of the transfer gate 234. Specifically, the transfer gate 234 conducts (turns on) the input terminal and the output terminal when the selection signal S is at the H level, and connects the input terminal and the output terminal when the selection signal S is at the L level. The space between them is made non-conductive (off). Then, a drive signal VOUT is output from the output terminal of the transfer gate 234.

  Here, the operation of the drive signal selection circuit 200 will be described with reference to FIG. FIG. 8 is a diagram for explaining the operation of the drive signal selection circuit 200. The print data signal SI is input serially in synchronization with the clock signal cSCK, and is sequentially transferred in the shift register 222 corresponding to the ejection unit 600. Then, when the input of the clock signal cSCK is stopped, the print data [SIH, SIL] of 2 bits corresponding to each of the ejection units 600 is held in each shift register 222. The print data signal SI is input in an order corresponding to the m-stage,..., Two-stage, one-stage ejection unit 600 of the shift register 222.

  When the latch signal cLAT rises, each of the latch circuits 224 simultaneously latches the 2-bit print data [SIH, SIL] held in the shift register 222. In FIG. 8, LT1, LT2,..., LTm represent 2-bit print data [SIH, SIL] latched by the latch circuit 224 corresponding to the one-stage, two-stage,. Show.

  The decoder 226 changes the logic level of the selection signal S in each of the periods T1, T2, and T3 according to the dot size defined by the latched 2-bit print data [SIH, SIL] as shown in FIG. To output.

  Specifically, when the print data [SIH, SIL] is [1, 1], the decoder 226 sets the selection signal S to the H, H, L level in the periods T1, T2, T3. In this case, the selection circuit 230 selects the trapezoidal waveform Adp1 in the period T1, selects the trapezoidal waveform Adp2 in the period T2, and does not select the trapezoidal waveform Adp3 in the period T3. As a result, the drive signal VOUT corresponding to the “large dot” shown in FIG. 4 is generated.

  When the print data [SIH, SIL] is [1, 0], the decoder 226 sets the selection signal S to the H, L, L level in the periods T1, T2, T3. In this case, the selection circuit 230 selects the trapezoidal waveform Adp1 in the period T1, does not select the trapezoidal waveform Adp2 in the period T2, and does not select the trapezoidal waveform Adp3 in the period T3. As a result, a drive signal VOUT corresponding to the “medium dot” shown in FIG. 4 is generated.

Further, when the print data [SIH, SIL] is [0, 1], the decoder 226 sets the selection signal S to the L, H, L level in the periods T1, T2, T3. In this case, the selection circuit 230 does not select the trapezoidal waveform Adp1 during the period T1, and selects the trapezoidal waveform Ad during the period T2.
Select p2 and do not select trapezoidal waveform Adp3 in period T3. As a result, the drive signal VOUT corresponding to the “small dot” shown in FIG. 4 is generated.

  Further, when the print data [SIH, SIL] is [0, 0], the decoder 226 sets the selection signal S to the L, L, H level in the periods T1, T2, T3. In this case, the selection circuit 230 does not select the trapezoidal waveform Adp1 in the period T1, does not select the trapezoidal waveform Adp2 in the period T2, and selects the trapezoidal waveform Adp3 in the period T3. As a result, a drive signal VOUT corresponding to “non-recording” shown in FIG. 4 is generated.

  As described above, the drive signal selection circuit 200 selects the waveform of the drive signal COM based on the print data signal SI, the latch signal cLAT, the change signal cCH, and the clock signal cSCK, and outputs the drive signal VOUT. In other words, the drive signal selection circuit 200 controls the supply of the drive signal COM to the piezoelectric element 60.

1.5 Configuration of Temperature Abnormality Detection Circuit Next, the temperature abnormality detection circuit 250 will be described with reference to FIG. FIG. 9 is a diagram illustrating a configuration of the temperature abnormality detection circuit 250. As shown in FIG. 9, the temperature abnormality detection circuit 250 includes a comparator 251, a reference voltage generation circuit 252, a transistor 253, a plurality of diodes 254, and resistors 255 and 256. As described above, all of the temperature abnormality detection circuits 250-1 to 250-n have the same configuration. Therefore, in FIG. 9, illustration of the detailed configuration of the temperature abnormality detection circuits 250-2 to 250-n is omitted.

  The voltage VDD2 is input to the reference voltage generation circuit 252. Then, the reference voltage generation circuit 252 generates the voltage Vref by transforming the voltage VDD2, and supplies the voltage Vref to the + input terminal of the comparator 251. The reference voltage generation circuit 252 is configured by, for example, a voltage regulator circuit.

  The plurality of diodes 254 are connected to each other in series. Of the plurality of diodes 254 connected in series, the voltage VDD2 is supplied to the anode terminal of the diode 254 located on the highest potential side via the resistor 255, and the cathode of the diode 254 located on the lowest potential side. A ground signal GND is supplied to the terminal. Specifically, the temperature abnormality detection circuit 250 includes the diodes 254-1, 254-2, 254-3, and 254-4 as the plurality of diodes 254. The anode terminal of the diode 254-1 is supplied with the voltage VDD2 via the resistor 255, and is connected to the negative input terminal of the comparator 251. The cathode terminal of the diode 254-1 is connected to the anode terminal of the diode 254-2. The cathode terminal of the diode 254-2 is connected to the anode terminal of the diode 254-3. The cathode terminal of the diode 254-3 is connected to the anode terminal of the diode 254-4. The ground signal GND is supplied to the cathode terminal of the diode 254-4. With the resistor 255 and the plurality of diodes 254 configured as described above, the voltage Vdet, which is the sum of the forward voltages of the plurality of diodes 254, is supplied to the negative input terminal of the comparator 251. Note that the number of the plurality of diodes 254 included in the temperature abnormality detection circuit 250 is not limited to four.

  The comparator 251 operates based on a potential difference between the voltage VDD2 and the ground signal GND. Then, the comparator 251 compares the voltage Vref supplied to the + input terminal with the voltage Vdet supplied to the − input terminal, and outputs a signal based on the comparison result from the output terminal.

The voltage VDD2 is supplied to the drain terminal of the transistor 253 via the resistor 256. The gate terminal of the transistor 253 is connected to the output terminal of the comparator 251, and the source terminal is supplied with the ground signal GND. The voltage supplied to the drain terminal of the transistor 253 connected as described above is output from the temperature abnormality detection circuit 250 as the abnormality signal XHOT.

  The voltage value of the voltage Vref generated by the reference voltage generation circuit 252 is lower than the voltage Vdet when the temperature of the plurality of diodes 254 is within a predetermined range. In this case, the comparator 251 outputs an L-level signal. Therefore, the transistor 253 is controlled to be turned off, and as a result, the temperature abnormality detection circuit 250 outputs the H-level abnormality signal XHOT.

  The forward voltage of the diode 254 has a characteristic of decreasing as the temperature rises. Therefore, when a temperature abnormality occurs in the print head 21, the temperature of the diode 254 increases, and the voltage Vdet decreases accordingly. Then, when the voltage Vdet falls below the voltage Vref due to the temperature rise, the output signal of the comparator 251 changes from the L level to the H level. Therefore, the transistor 253 is turned on. As a result, the temperature abnormality detection circuit 250 outputs the L-level abnormality signal XHOT. That is, the temperature abnormality detection circuit 250 is supplied as the H-level abnormality signal XHOT as the pull-up voltage of the transistor 253 by controlling the transistor 253 to be turned on or off based on the temperature of the drive signal selection circuit 200. The voltage VDD2 is output, and the ground signal GND is output as the L-level abnormal signal XHOT.

  Also, as shown in FIG. 9, the outputs of the n temperature abnormality detection circuits 250-1 to 250-n are commonly connected. Then, when a temperature abnormality occurs in any of the temperature abnormality detection circuits 250-1 to 250-n, the transistor 253 corresponding to the temperature abnormality detection circuit 250 in which the temperature abnormality has occurred is turned on. As a result, the ground signal GND is supplied to the node to which the abnormal signal XHOT is output via the transistor 253. Therefore, abnormality signal XHOT output from temperature abnormality detection circuits 250-1 to 250-n is controlled to L level. That is, the temperature abnormality detection circuits 250-1 to 250-n are wired-OR connected. Thus, even when a plurality of temperature abnormality detection circuits 250 are provided in the print head 21, the presence or absence of the temperature abnormality of the print head 21 is indicated without increasing the number of wires for transmitting the abnormality signal XHOT. An abnormal signal XHOT can be propagated.

1.6 Configuration of Print Head and Print Head Control Circuit Next, details of the electrical connection between the control mechanism 10 and the print head 21 will be described. In the following description, the print head 21 of the first embodiment will be described as including four drive signal selection circuits 200-1 to 200-4. That is, the print head 21 in the first embodiment has four print data signals SI1 to SI4 corresponding to the four drive signal selection circuits 200-1 to 200-4 and four drive signals COM1 to COM4, respectively. COM4 and four reference voltage signals CGND1 to CGND4 are input.

  FIG. 10 is a diagram schematically illustrating an internal configuration of the liquid ejection device 1 when viewed from the Y direction. As shown in FIG. 10, the liquid ejection device 1 includes a main board 11, a cable 19, and a print head 21.

  Various circuits including the drive signal output circuit 50, the control circuit 100, and the power supply circuit 110 included in the control mechanism 10 shown in FIGS. 1 and 2 are mounted on the main board 11. Further, the connector 12 to which one end of the cable 19 is attached is mounted on the main board 11. Although FIG. 10 shows one circuit board as the main board 11, the main board 11 may be composed of two or more circuit boards.

  The print head 21 has a head 310, a substrate 320, and a connector 350. The other end of the cable 19 is attached to the connector 350. Thereby, various signals generated by the control mechanism 10 are input to the print head 21 via the cable 19. The details of the configuration of the print head 21 and the details of the signal transmitted through the cable 19 will be described later.

  The liquid ejecting apparatus 1 configured as described above includes the drive signals COM1 to COM4 output from the control mechanism 10 mounted on the main board 11, the reference voltage signals CGND1 to CGND4, the print data signals SI1 to SI4, and the latch signal LAT. The operation of the print head 21 is controlled based on various signals including a change signal CH, a clock signal SCK, and diagnostic signals DIG-A to DIG-D. That is, in the liquid ejecting apparatus 1 shown in FIG. 10, a control mechanism 10 for outputting various signals for controlling the operation of the print head 21 and a cable 19 for transmitting various signals for controlling the operation of the print head 21 are provided. Is an example of the print head control circuit 15 that controls the operation of the print head 21 having the function of performing self-diagnosis.

  FIG. 11 is a diagram illustrating a configuration of the cable 19. The cable 19 is substantially rectangular having short sides 191 and 192 facing each other and long sides 193 and 194 facing each other, and is, for example, a flexible flat cable (FFC). The cable 19 electrically connects the plurality of terminals 195 arranged side by side along the short side 191, the plurality of terminals 196 arranged side by side along the short side 192, and the plurality of terminals 195 and the plurality of terminals 196. And a plurality of wirings 197 to be connected.

  Specifically, on the short side 191 side of the cable 19, 29 terminals 195 are arranged side by side in the order of the terminals 195-1 to 195-29 from the long side 193 side to the long side 194 side. Further, on the short side 192 side of the cable 19, 29 terminals 196 are arranged side by side in the order of the terminals 196-1 to 196-29 from the long side 193 side to the long side 194 side. In the cable 19, 29 wires 197 for electrically connecting each of the terminals 195 and each of the terminals 196 are provided from the long side 193 side to the long side 194 side. Are arranged side by side. The wiring 197-1 electrically connects the terminal 195-1 and the terminal 196-1. Similarly, the wiring 197-k (k is any one of 1 to 29) electrically connects the terminal 195-k and the terminal 196-k.

  Each of the wirings 197-1 to 197-29 is insulated from each other by the insulator 198, and between the wiring and the outside of the cable 19. Then, the cable 19 propagates the signal input from the terminal 195-k through the wiring 197-k and outputs the signal from the terminal 196-k. Note that the configuration of the cable 19 shown in FIG. 11 is an example, and the present invention is not limited to this. For example, the plurality of terminals 195 and the plurality of terminals 196 may be provided on different surfaces of the cable 19. Further, the numbers of the terminals 195, the terminals 196, and the wires 197 provided on the cable 19 are not limited to 29.

  Next, the configuration of the print head 21 will be described. FIG. 12 is a perspective view showing the configuration of the print head 21. As shown in FIG. 12, the print head 21 has a head 310 and a substrate 320. On the lower surface of the head 310 in the Z direction, an ink ejection surface 311 on which a plurality of ejection units 600 are formed is located.

FIG. 13 is a plan view showing the configuration of the ink ejection surface 311. As shown in FIG. 13, four nozzle plates 632 having nozzles 651 included in the plurality of ejection units 600 are provided on the ink ejection surface 311 in a row in the X direction. In each of the nozzle plates 632, the nozzles 651 are provided side by side in the Y direction. That is, four nozzle rows L1 to L4 are formed on the ink ejection surface 311. In FIG. 13, the nozzles 651 are provided in one row in the Y direction in the nozzle rows L1 to L4 formed in each nozzle plate 632, but the nozzles 651 are provided in two or more rows in the Y direction. They may be provided side by side.

  The nozzle rows L1 to L4 are provided corresponding to the drive signal selection circuits 200-1 to 200-4, respectively. Specifically, the drive signal VOUT1 output from the drive signal selection circuit 200-1 is supplied to one end of the piezoelectric element 60 included in the plurality of ejection units 600 provided in the nozzle row L1, and is supplied to the other end of the piezoelectric element 60. Is supplied with a reference voltage signal CGND1. Similarly, the drive signals VOUT2 to VOUT4 output from the drive signal selection circuits 200-2 to 200-4 are supplied to one end of the piezoelectric element 60 of the plurality of ejection units 600 provided in each of the nozzle rows L2 to L4, The other end of the corresponding piezoelectric element 60 is supplied with each of the reference voltage signals CGND2 to CGND4.

  Next, the configuration of the ejection unit 600 included in the head 310 will be described with reference to FIG. FIG. 14 is a diagram illustrating a schematic configuration of one of the plurality of ejection units 600 included in the head 310. As shown in FIG. 14, the head 310 includes a discharge unit 600 and a reservoir 641.

  The reservoir 641 is provided corresponding to each of the nozzle rows L1 to L4. Then, ink is introduced into the reservoir 641 from the ink supply port 661.

  The ejection unit 600 includes a piezoelectric element 60, a vibration plate 621, a cavity 631, and a nozzle 651. The vibration plate 621 is deformed according to the displacement of the piezoelectric element 60 provided on the upper surface in FIG. The vibration plate 621 functions as a diaphragm that enlarges / reduces the internal volume of the cavity 631. The inside of the cavity 631 is filled with ink. The cavity 631 functions as a pressure chamber in which the internal volume changes due to the displacement of the piezoelectric element 60. The nozzle 651 is an opening formed in the nozzle plate 632 and communicating with the cavity 631. Then, the ink stored in the cavity 631 is ejected from the nozzle 651 according to the change in the internal volume of the cavity 631.

  The piezoelectric element 60 has a structure in which a piezoelectric body 601 is sandwiched between a pair of electrodes 611 and 612. In the piezoelectric body 601 having this structure, the central portions of the electrodes 611 and 612 and the diaphragm 621 bend in the vertical direction in FIG. 14 with respect to both ends in accordance with the voltage supplied to the electrodes 611 and 612. Specifically, the drive signal VOUT is supplied to the electrode 611, and the reference voltage signal CGND is supplied to the electrode 612. When the voltage of the drive signal VOUT increases, the central portion of the piezoelectric element 60 bends upward, and when the voltage of the drive signal VOUT decreases, the central portion of the piezoelectric element 60 flexes downward. That is, when the piezoelectric element 60 bends upward, the internal volume of the cavity 631 increases. Therefore, ink is drawn from the reservoir 641. When the piezoelectric element 60 is bent downward, the internal volume of the cavity 631 is reduced. Therefore, an amount of ink is ejected from the nozzle 651 according to the degree of reduction in the internal volume of the cavity 631. As described above, the piezoelectric element 60 is driven by the drive signal VOUT based on the drive signal COM, and the ink is ejected from the nozzle 651 by driving the piezoelectric element 60. The structure of the piezoelectric element 60 is not limited to the illustrated structure, and may be any type that can eject ink in accordance with the displacement of the piezoelectric element 60. Further, the piezoelectric element 60 is not limited to the bending vibration, and may have a configuration using a longitudinal vibration.

Returning to FIG. 12, the substrate 320 has a surface 321 and a surface 322 different from the surface 321. Here, the surface 321 and the surface 322 are surfaces opposed to each other with the base material of the substrate 320 interposed therebetween. In other words, the surfaces 321 and 322 are the front and back surfaces of the substrate 320. The substrate 320 has a substantially rectangular shape formed by a side 323, a side 324 facing the side 323 in the X direction, a side 325, and a side 326 facing the side 325 in the Y direction. In other words, the substrate 320
Has a side 323, a side 324 different from the side 323, a side 325 intersecting the side 323 and the side 324, and a side 326 intersecting the side 323 and the side 324 and different from the side 325. Here, the sides 325 and 326 that intersect with the sides 323 and 324 are defined as a virtual extension of the side 325 intersecting with a virtual extension of the side 323 and a virtual extension of the side 324. The line intersects the virtual extension of the side 323 and the virtual extension of the side 324. That is, the shape of the substrate 320 is not limited to a rectangle, and may be, for example, a polygon such as a hexagon or an octagon, and further, a notch or an arc may be partially formed. .

  Here, the details of the substrate 320 will be described with reference to FIGS. FIG. 15 is a plan view when the substrate 320 is viewed from the surface 322. FIG. 16 is a plan view when the substrate 320 is viewed from the surface 321. As shown in FIG. 15, on a surface 322 of the substrate 320, electrode groups 330a to 330d are provided. Specifically, each of the electrode groups 330a to 330d has a plurality of electrodes arranged in parallel in the Y direction. The electrode groups 330a to 330d are provided in the order of the electrode groups 330a, 330b, 330c, and 330d from the side 323 to the side 324. Each of the electrode groups 330a to 330d provided as described above is electrically connected to a flexible printed circuit (FPC) (not shown).

  As shown in FIGS. 15 and 16, the substrate 320 has FPC insertion holes 332a and 332b, which are through holes penetrating the surface 321 and the surface 322, and ink supply passage insertion holes 331a to 331d. ing.

  The FPC insertion hole 332a is located between the electrode group 330a and the electrode group 330b in the X direction, and is inserted between the FPC electrically connected to the electrode group 330a and the FPC electrically connected to the electrode group 330b. Is done. The FPC insertion hole 332b is located between the electrode group 330c and the electrode group 330d in the X direction, and is inserted between the FPC electrically connected to the electrode group 330c and the FPC electrically connected to the electrode group 330d. Is done.

  The ink supply passage insertion hole 331a is located on the side 323 side of the electrode group 330a in the X direction. The ink supply path insertion holes 331b and 331c are located between the electrode group 330b and the electrode group 330c in the X direction, and the ink supply path insertion hole 331b is on the side 325 and the ink supply path insertion hole 331c is on the side 326. As shown in FIG. The ink supply path insertion hole 331d is located on the side 324 of the electrode group 330d in the X direction. In each of the ink supply path insertion holes 331a to 331d, a part of an ink supply path (not shown) communicating with an ink supply port 661 for introducing ink to the ejection unit 600 corresponding to each of the nozzle rows L1 to L4 is provided. It is inserted.

  Further, as shown in FIGS. 15 and 16, the substrate 320 has fixing portions 346 to 349 for fixing the substrate 320 included in the print head 21 to the carriage 20 shown in FIG. 1. Each of the fixing portions 346 to 349 is a through hole penetrating through the surface 321 and the surface 322 of the substrate 320. Then, the substrate 320 is fixed to the carriage 20 by attaching screws (not shown) through which the fixing portions 346 to 349 are inserted to the carriage 20. The fixing portions 346 to 349 are not limited to the through holes formed in the substrate 320. For example, the fixing portions 346 to 349 may be configured to fix the substrate 320 to the carriage 20 by fitting.

The fixing portions 346 and 347 are located on the side 323 of the ink supply path insertion hole 331a in the X direction, and are provided side by side so that the fixing portion 346 is on the side 325 and the fixing portion 347 is on the side 326. The fixing portions 348 and 349 are located on the side 324 of the ink supply path insertion hole 331d in the X direction, and are provided side by side so that the fixing portion 348 is on the side 325 and the fixing portion 349 is on the side 326.

  Also, as shown in FIG. 16, on a surface 321 of the substrate 320, an integrated circuit 241 constituting the diagnostic circuit 240 shown in FIG. 2 is provided. Specifically, the integrated circuit 241 is provided on the surface 321 side of the substrate 320, between the fixing portion 347 and the fixing portion 349, and on the side 326 side of the electrode groups 330a to 330d. Then, the integrated circuit 241 constituting the diagnosis circuit 240 diagnoses whether or not normal ejection of ink from the nozzle 651 is possible based on the diagnosis signals DIG-A to DIG-D.

  Further, as shown in FIG. 16, a connector 350 is provided on the substrate 320. The connector 350 is provided along the side 323 on the surface 321 side of the substrate 320. That is, the integrated circuit 241 configuring the connector 350 and the diagnostic circuit 240 is provided on the same surface of the substrate 320.

  Here, the configuration of the connector 350 will be described with reference to FIG. FIG. 17 is a diagram showing a configuration of the connector 350. As shown in FIG. 17, the connector 350 has a housing 351, a cable attachment portion 352 formed on the housing 351, and a plurality of terminals 353. The plurality of terminals 353 are juxtaposed along the side 323. Specifically, in the connector 350 of the first embodiment, 29 terminals 353 are juxtaposed along the side 323. Here, the 29 terminals 353 are referred to as terminals 353-1, 353-2,..., 353-29 in order from the side 325 to the side 326 in the direction along the side 323. The cable attachment portion 352 is located on the substrate 320 side of the plurality of terminals 353 in the Z direction. The cable 19 is attached to the cable attachment portion 352. When the cable 19 is attached to the cable attachment portion 352, each of the terminals 196-1 to 196-29 included in the cable 19 and each of the terminals 353-1 to 353-29 included in the connector 350 are electrically connected. Contact.

  Here, in the connector 350 shown in FIG. 17, the cable attachment portion 352 is located on the substrate 320 side in the Z direction, and the plurality of terminals 353 are located on the ink ejection surface 311 side in the Z direction, as shown in FIG. Like the connector 350, it is preferable that the plurality of terminals 353 be located on the substrate 320 side in the Z direction, and the cable attachment portion 352 be located on the ink ejection surface 311 side in the Z direction.

  FIG. 18 is a diagram illustrating another configuration of the connector 350. In the liquid ejection apparatus 1, most of the ink ejected from the nozzles 651 lands on the medium P to form an image. However, a part of the ink ejected from the nozzle 651 may become mist before landing on the medium P and float inside the liquid ejecting apparatus 1. Further, even after the ink ejected from the nozzle 651 lands on the medium P, the ink lands on the medium P due to the movement of the carriage 20 on which the print head 21 is mounted and the airflow generated due to the conveyance of the medium P. May re-float inside the liquid ejection device 1 in some cases. When ink floating inside the liquid ejecting apparatus 1 adheres to the plurality of terminals 353 included in the connector 350 and the terminals 196 included in the cable 19 that transmits a signal to the print head 21, the terminals are short-circuited. There is a risk. As a result, the waveforms of various signals input to the print head 21 may be distorted, and the ejection accuracy of the ink ejected from the print head 21 may be deteriorated.

As in the connector 350 shown in FIG. 18, the plurality of terminals 353 are located on the substrate 320 side in the Z direction, and the cable attachment portion 352 is located on the ink ejection surface 311 side in the Z direction, so that the cable 19 is attached to the connector 350. In this case, the possibility that the terminals 353 and 196 are exposed to the ink ejection surface 311 where the floating ink is likely to adhere is reduced. Therefore, due to the ink floating inside the liquid ejection device 1,
It is possible to reduce the possibility that a short circuit will occur between the terminals 353 included in the connector 350 and between the terminals 196 included in the cable 19. Therefore, it is possible to reduce a possibility that a signal transmitted through the cable 19 may be distorted.

  Here, a specific example of the electrical connection between the cable 19 and the connector 350 will be described with reference to FIG. FIG. 19 is a diagram for describing a specific example when the cable 19 is attached to the connector 350. As shown in FIG. 19, the terminal 353 of the connector 350 has a board mounting part 353a, a housing insertion part 353b, and a cable holding part 353c. The board mounting portion 353a is located below the connector 350 and is provided between the housing 351 and the board 320. The board mounting portion 353a is electrically connected to an electrode (not shown) provided on the board 320 by, for example, soldering. The housing insertion portion 353b passes through the inside of the housing 351. And the housing insertion part 353b electrically connects the board mounting part 353a and the cable holding part 353c. The cable holding portion 353c has a curved shape protruding into the cable attachment portion 352. Then, when the cable 19 is attached to the cable attachment portion 352, the cable holding portion 353c and the terminal 196 make electrical contact via the contact portion 180. Thereby, the cable 19 is electrically connected to the connector 350 and the board 320. In this case, when the cable 19 is attached, stress is generated in the curved shape formed in the cable holding portion 353c. The cable 19 is held inside the cable attachment portion 352 by the stress.

  As described above, the cable 19 and the connector 350 are electrically connected by the terminal 196 and the terminal 353 being in contact with each other through the contact portion 180. FIG. 11 shows contact portions 180-1 to 180-29 where each of the terminals 196-1 to 196-29 and the terminal 353 of the connector 350 are in electrical contact. In the cable 19, the terminal 195-k is electrically connected to the connector 12, and the terminal 196-k is electrically connected to the connector 350 via the contact portion 180-k.

  In the print head 21 configured as described above, the drive signals COM1 to COM4 output from the control mechanism 10, the reference voltage signals CGND1 to CGND4, the print data signals SI1 to SI4, the latch signal LAT, the change signal CH, and the clock signal SCK. Are input to the print head 21 via the connector 350. Then, the light propagates through a wiring pattern (not shown) provided on the substrate 320 and is input to each of the electrode groups 330a to 330d.

  Various signals input to each of the electrode groups 330a to 330d are supplied to the drive signal selection circuit 200- corresponding to each of the nozzle rows L1 to L4 via an FPC electrically connected to each of the electrode groups 330a to 330d. 1 to 200-4. Then, the drive signal selection circuits 200-1 to 200-4 generate drive signals VOUT1 to VOUT4 based on the input signals and supply the generated drive signals to the piezoelectric elements 60 included in the nozzle rows L1 to L4, respectively. Accordingly, various signals input to the connector 350 are supplied to the piezoelectric elements 60 included in the plurality of ejection units 600. Each of the drive signal selection circuits 200-1 to 200-4 may be provided inside the head 310, or may be mounted on a FPC by a COF (Chip On Film).

1.7 Details of Signal Propagated by Cable Details of the signal propagated between the print head control circuit 15 and the print head 21 in the liquid ejection device 1 configured as described above will be described with reference to FIG. I do.

FIG. 20 is a diagram for explaining details of a signal propagated through the cable 19. As shown in FIG. 20, the cable 19 includes wires for transmitting the drive signals COM1 to COM4, wires for transmitting the reference voltage signals CGND1 to CGND4, a temperature signal TH, a latch signal LAT, a clock signal SCK, A line that transmits each of the change signal CH, the print data signal SI1, and the abnormal signal XHOT, a line that transmits each of the diagnostic signals DIG-A to DIG-E, and a line that transmits each of the voltages VHV, VDD1, and VDD2. And a plurality of wirings for transmitting a plurality of ground signals GND.

  Specifically, each of the drive signals COM1 to COM4 and the reference voltage signals CGND1 to CGND4 is input to the cable 19 from each of the terminals 195-1 to 195-8, and propagates through each of the wirings 197-1 to 197-8. After that, the signal is input to each of the terminals 196-1 to 196-8 and to each of the terminals 353-1 to 353-8 of the connector 350 via each of the contact portions 180-1 to 180-8.

  The diagnostic signal DIG-A is input to the cable 19 from the terminal 195-25 and propagated through the wiring 197-25, and then to the terminal 196-25 and the terminal 353-25 of the connector 350 via the contact portion 180-25. Is entered. Similarly, the latch signal LAT is also input to the cable 19 from the terminal 195-25, propagated through the wiring 197-25, and then transmitted through the terminal 196-25 and the contact portion 180-25 to the terminal 353- of the connector 350. 25. That is, the wiring 197-25 serves as a wiring for transmitting the diagnostic signal DIG-A and a wiring for transmitting the latch signal LAT, and the terminal 353-25 has a terminal for receiving the diagnostic signal DIG-A, Also serves as a terminal to which LAT is input. Then, the contact portion 180-25 is electrically contacted with the wiring transmitting the diagnostic signal DIG-A, and is also in electrical contact with the wiring transmitting the latch signal LAT. The diagnostic signal DIG-A is an example of a second diagnostic signal in the first embodiment, and the wiring 197-25 for transmitting the diagnostic signal DIG-A is an example of a second diagnostic signal propagation wiring in the first embodiment. The terminal 353-25 to which the diagnostic signal DIG-A is input is an example of the second terminal in the first embodiment, and the contact portion 180-25 where the wiring 197-25 and the terminal 353-25 are in electrical contact is the second terminal. It is an example of the 2nd contact part in one embodiment.

  The diagnostic signal DIG-B is input to the cable 19 from the terminal 195-23, propagated through the wiring 197-23, and then transmitted to the terminal 196-23 and the terminal 353-23 of the connector 350 via the contact portion 180-23. Is entered. Similarly, the clock signal SCK is also input to the cable 19 from the terminal 195-23 and propagated through the wiring 197-23, and then, through the terminal 196-23 and the contact portion 180-23, to the terminal 353-23 of the connector 350. Is input to That is, the wiring 197-23 serves both as a wiring for transmitting the diagnostic signal DIG-B and a wiring for transmitting the clock signal SCK, and the terminal 353-23 is connected to a terminal to which the diagnostic signal DIG-B is input and a clock signal SCK. Also serves as a terminal to which SCK is input. Then, the contact portion 180-23 is electrically contacted with the wiring for transmitting the diagnostic signal DIG-B and also electrically with the wiring for transmitting the clock signal SCK. The diagnostic signal DIG-B is an example of a first diagnostic signal in the first embodiment, and the wiring 197-23 for transmitting the diagnostic signal DIG-B is an example of a first diagnostic signal propagation wiring in the first embodiment. The terminal 353-23 to which the diagnostic signal DIG-B is input is an example of a first terminal in the first embodiment, and the contact portion 180-23 in which the wiring 197-23 and the terminal 353-23 are in electrical contact is a third terminal. It is an example of the 1st contact part in one embodiment.

The diagnostic signal DIG-C is input to the cable 19 from the terminal 195-21, propagates through the wiring 197-21, and then to the terminal 196-21 and the terminal 353-21 of the connector 350 via the contact portion 180-21. Is entered. Similarly, the change signal CH is also input to the cable 19 from the terminal 195-21 and propagated through the wiring 197-21, and then, through the terminal 196-21 and the contact portion 180-21, the terminal 353 of the connector 350. 21. That is, the wiring 197-21 is connected to the wiring for transmitting the diagnostic signal DIG-C and the change signal C
The terminal 353-21 also serves as a terminal for inputting the diagnostic signal DIG-C and a terminal for inputting the change signal CH. Then, the contact portion 180-21 is electrically contacted with the wiring for transmitting the diagnostic signal DIG-C and also electrically connected with the wiring for transmitting the change signal CH. The diagnostic signal DIG-C is an example of a third diagnostic signal in the first embodiment, and the wiring 197-21 for transmitting the diagnostic signal DIG-C is an example of a third diagnostic signal propagation wiring in the first embodiment. The terminal 353-21 to which the diagnostic signal DIG-C is input is an example of the third terminal in the first embodiment, and the contact portion 180-21 where the wiring 197-21 and the terminal 353-21 are in electrical contact is the third terminal. It is an example of the 3rd contact part in one embodiment.

  The diagnostic signal DIG-D is input to the cable 19 from the terminal 195-19, propagates through the wiring 197-19, and then to the terminal 196-19 and the terminal 353-19 of the connector 350 via the contact portion 180-19. Is entered. Similarly, the print data signal SI1 is also input from the terminal 195-19 to the cable 19, propagated through the wiring 197-19 and the contact portion 180-19, and then transmitted through the terminal 196-19 to the terminal 353 of the connector 350. -19 is input. That is, the wiring 197-19 serves as a wiring for transmitting the diagnostic signal DIG-D and a wiring for transmitting the print data signal SI1, and the terminal 353-19 is connected to a terminal to which the diagnostic signal DIG-D is input and a terminal for printing. Also serves as a terminal to which data signal SI1 is input. The contact portion 180-19 is in electrical contact with the wiring for transmitting the diagnostic signal DIG-D, and is also in electrical contact with the wiring for transmitting the print data signal SI1. The diagnostic signal DIG-D is an example of a fourth diagnostic signal in the first embodiment, and a wiring 197-19 for transmitting the diagnostic signal DIG-D is an example of a fourth diagnostic signal propagation wiring in the first embodiment. The terminal 353-19 to which the diagnostic signal DIG-D is input is an example of the fourth terminal in the first embodiment, and the contact portion 180-19 where the wiring 197-19 and the terminal 353-19 are electrically connected is the fourth terminal. It is an example of the 4th contact part in one embodiment.

  The diagnostic signal DIG-E is input to the terminal 353-11 of the connector 350, and is input to the cable 19 via the contact portion 180-11 and the terminal 196-11. Then, the diagnostic signal DIG-E is input to the main board 11 from the terminal 195-11 after being propagated through the wiring 197-11. Similarly, the abnormal signal XHOT is input to the terminal 353-11 of the connector 350, and is input to the cable 19 via the contact portion 180-11 and the terminal 196-11. Then, the abnormal signal XHOT is input to the main board 11 from the terminal 195-11 after being propagated through the wiring 197-11. That is, the wiring 197-11 serves as a wiring for transmitting the diagnostic signal DIG-E and a wiring for transmitting the abnormal signal XHOT, and the terminal 353-11 is connected to a terminal to which the diagnostic signal DIG-E is input and a terminal for receiving the abnormal signal. Also serves as a terminal to which XHOT is input. Then, the contact portion 180-11 is electrically contacted with the wiring for transmitting the diagnostic signal DIG-E and also electrically with the wiring for transmitting the abnormal signal XHOT. The diagnostic signal DIG-E is an example of a fifth diagnostic signal in the first embodiment, and the wiring 197-11 for transmitting the diagnostic signal DIG-E is an example of a fifth diagnostic signal propagation wiring in the first embodiment. The terminal 353-11 to which the diagnostic signal DIG-E is input is an example of the fifth terminal in the first embodiment, and the contact portion 180-11 where the wiring 197-11 and the terminal 353-11 are in electrical contact with each other is the fourth terminal. It is an example of a 5th contact part in one embodiment.

  As described above, in the first embodiment, each of the diagnostic signals DIG-A to DIG-E and each of the latch signal LAT, the clock signal SCK, the change signal CH, the print data signal SI1, and the abnormal signal XHOT are common. Propagated by wiring. Here, each of the diagnostic signals DIG-A to DIG-E and each of the latch signal LAT, the clock signal SCK, the change signal CH, the print data signal SI1, and the abnormal signal XHOT are propagated through common wiring, and are transmitted to a common terminal. An example of an input method will be described.

  For example, the control circuit 100 controls the diagnosis signal DIG-A and the latch signal LAT, the diagnosis signal DIG-B and the clock signal SCK, the diagnosis signal DIG-C and the change signal in accordance with the operation states of the liquid ejection apparatus 1 and the print head 21. CH and the diagnostic signal DIG-D and the print data signal SI1 are generated in a time-division manner. Specifically, when the liquid ejection apparatus 1 is in a printing state in which ink is ejected, the control circuit 100 generates a latch signal LAT, a clock signal SCK, a change signal CH, and a print data signal SI1 and outputs them to the print head 21. I do. Further, when the liquid ejection apparatus 1 is not in the printing state in which the ink is ejected and the print head 21 performs the self-diagnosis, the control circuit 100 generates the diagnostic signals DIG-A to DIG-D and outputs them to the print head 21 I do. As a result, each of the latch signal LAT, the clock signal SCK, the change signal CH, and the print data signal SI1, and each of the diagnostic signals DIG-A to DIG-D can be propagated by common wiring. Can be input to a common terminal through the contact portion.

  As a method of transmitting the diagnostic signal DIG-E and the abnormal signal XHOT through a common wiring and inputting the signal to a common terminal, for example, a wiring through which a diagnostic signal DIG-E indicating a diagnosis result in the diagnostic circuit 240 is output And the wiring from which the abnormal signal XHOT is output is wired-OR-connected in the print head 21, the wired-OR-connected signal is input to a common terminal, and then propagated through the common wiring. Accordingly, when an abnormality occurs in at least one of the diagnosis result of the temperature abnormality detection circuit 250 and the diagnosis result of the diagnosis circuit 240, the ink can be normally ejected from the print head 21. Is transmitted, and if both the diagnosis of whether the temperature is abnormal in the temperature abnormality detection circuit 250 and the diagnosis in the diagnosis circuit 240 are normal, the ink in the print head 21 is normal. An H-level signal indicating that proper ejection is possible is propagated.

  The diagnostic signals DIG-A to DIG-E and the latch signal LAT, the clock signal SCK, the change signal CH, the print data signal SI1, and the abnormal signal XHOT are propagated through common wiring, and are connected to a common terminal. Is an example. For example, a configuration may be employed in which a signal transmitted through a wiring and a signal input to a terminal are switched by a selector or the like.

  The print data signal SI, the change signal CH, the latch signal LAT, the clock signal SCK, and the abnormal signal XHOT are important signals for controlling the ejection of the print head 21. When this occurs, there is a possibility that the ejection accuracy of the ink may deteriorate. The wiring through which such an important signal is propagated and the wiring through which the print head 21 performs a self-diagnosis signal are shared, and a terminal to which the signal is input and a signal through which the print head 21 performs a self-diagnosis are used. Of the print head 21 based on the result of the self-diagnosis of the print head 21, the print data signal SI1, the change signal CH, and the latch signal LAT. , It is possible to diagnose whether the clock signal SCK and the abnormal signal XHOT are normally transmitted. Further, since a plurality of signals are transmitted through one wiring and a plurality of signals are input to one terminal, the number of wirings to be provided in the cable 19 and the number of terminals provided in the connector 350 can be reduced. Becomes

  After each of the print data signals SI2 to SI4 is input to the cable 19 from each of the terminals 195-17, 195-15, and 195-13, and is propagated through each of the wirings 197-17, 197-15, and 197-13. , The terminals 196-17, 196-15, 196-13 and the terminals 353-17, 353-15, 353-13 of the connector 350 via the contact portions 180-17, 180-15, 180-13, respectively. Is input to

The voltage VHV is input to the cable 19 from the terminal 195-9, propagated through the wiring 197-9, and then input to the terminal 353-9 via the terminal 196-9 and the contact portion 180-9. . The voltage VHV is a signal having a voltage value larger than the voltage VDD1, and the voltage VHV supplied to the terminal 353-9 is supplied to the drive signal selection circuit 200. The voltage VHV is used in the drive signal selection circuit 200 as a voltage for level-shifting the logic level of the selection signal S to high-amplitude logic.

  The voltage VDD1 is input to the cable 19 from the terminal 195-29, propagated through the wiring 197-29, and then input to the terminal 353-29 of the connector 350 via the terminal 196-29 and the contact portion 180-29. . The voltage VDD <b> 1 supplied to the terminals 353-29 is supplied to the drive signal selection circuit 200. The voltage VDD1 is used as a power supply voltage for the drive signal selection circuit 200 and as a voltage for generating various control signals for controlling the operation of the drive signal selection circuit 200.

  The voltage VDD2 is input to the cable 19 from the terminal 195-24, propagated through the wiring 197-24, and then input to the terminal 353-24 of the connector 350 via the terminal 196-24 and the contact portion 180-24. . The voltage VDD <b> 2 supplied to the terminals 353-24 is supplied to the temperature abnormality detection circuit 250. Then, the voltage VDD2 is used as a power supply voltage of the comparator 251 as shown in FIG. 9 and as a pull-up voltage for generating the abnormal signal XHOT and the diagnostic signal DIG-E. That is, when the wiring 197-11 for transmitting the abnormal signal XHOT and the diagnostic signal DIG-E and the wiring 197-24 for transmitting the voltage VDD2 are electrically connected to the print head 21, the abnormal signal XHOT and the diagnostic The wiring 197-11 for transmitting the signal DIG-E and the wiring 197-24 for transmitting the voltage VDD2 are electrically connected to each other through the terminals 353-11 and 353-24 of the connector 350. In other words, in the print head 21, the terminals 353-11 and 353-24 of the connector 350 are electrically connected, and further, the contact portions 180-11 and 180-24 are electrically connected to each other. It is connected to the. Note that the term “electrically connected” is not limited to being directly connected electrically via a wiring pattern provided on the substrate 320, and may be, for example, being electrically connected via a resistance element or a capacitor element. Including the case where

  Here, the voltage VDD1 is an example of a first voltage signal in the first embodiment, and the wiring 197-29 that propagates the voltage VDD1 is an example of a first voltage signal transmission wiring in the first embodiment. Is an example of the sixth terminal in the first embodiment, and the contact portion 180-29 in which the wiring 197-29 and the terminal 353-29 are in electrical contact is the terminal 353-29 in the first embodiment. It is an example of a 6th contact part. The voltage VDD2 is an example of a second voltage signal in the first embodiment, the wiring 197-24 that propagates the voltage VDD2 is an example of a second voltage signal transmission wiring in the first embodiment, and the voltage VDD2 is The input terminal 353-24 is an example of the seventh terminal in the first embodiment, and the contact portion 180-24 in which the wiring 197-24 and the terminal 353-24 are in electrical contact is the third terminal in the first embodiment. 7 is an example of a contact portion. Further, the voltage VHV is an example of the third voltage signal in the first embodiment, the wiring 197-9 for transmitting the voltage VHV is an example of the third voltage signal transmitting wiring in the first embodiment, and the voltage VHV is The input terminal 353-9 is an example of the eighth terminal in the first embodiment, and the contact portion 180-9 in which the wiring 197-9 and the terminal 353-9 are in electrical contact is the fourth terminal in the first embodiment. 8 is an example of a contact section.

  The temperature signal TH is input to the terminal 353-27 of the connector 350, and is input to the cable 19 via the contact portion 180-27 and the terminal 196-27. Then, the temperature signal TH is input to the main board 11 from the terminal 195-27 after being propagated through the wiring 197-27.

The ground signal GND is supplied to terminals 195-10, 195-12, 195-14, 195-
16, 195-18, 195-20, 195-22, 195-26, and 195-28 are input to the cable 19, and are wired 197-10, 197-12, 197-14, 197-16, and 197-18. , 197-20, 197-22, 197-26, and 197-28, and then the terminals 196-10, 196-12, 196-14, 196-16, 196-18, 196-20, 196 -22, 196-26, 196-28, and contact portions 180-10, 180-12, 180-14, 180-16, 180-18, 180-20, 180-22, 180-26, 180- 28, the terminals 353-10, 353-12, 353-14, 353-16, 353-18, 353-20, 3 of the connector 350 Is input to each of 3-22,353-26,353-28.

  The voltages VHV and VDD1 are supplied to the drive signal selection circuit 200. The voltages VHV and VDD1 are used as voltages for generating various control signals for controlling the operation of the drive signal selection circuit 200. The drive signal selection circuit 200 generates the drive signal VOUT by selecting or non-selecting the waveform of the drive signal COM. Therefore, the drive signal selection circuit 200 operates at a high speed according to the ink ejection speed. Therefore, noise according to the operation of the drive signal selection circuit 200 may be superimposed on the power supply voltage of the drive signal selection circuit 200 and the voltages VHV and VDD1 used as various control voltages.

  On the other hand, the voltage VDD2 is supplied to the temperature abnormality detection circuit 250. The voltage VDD2 is used as a power supply voltage of the temperature abnormality detection circuit 250 and a pull-up voltage for generating the abnormality signal XHOT and the diagnostic signal DIG-E. The logic levels of the abnormal signal XHOT and the diagnostic signal DIG-E indicate that at least one of the diagnostic result of the temperature abnormality detecting circuit 250 and the diagnostic result of the diagnostic circuit 240 is abnormal. In this case, the level becomes L level, and when both the diagnosis result of the temperature abnormality detection circuit 250 whether the temperature is abnormal and the diagnosis result in the diagnosis circuit 240 are normal, the level becomes H level. In other words, the logic levels of the abnormal signal XHOT and the diagnostic signal DIG-E do not change when no abnormality occurs in the print head 21. Therefore, the possibility that noise is superimposed on the voltage VDD2 used as the power supply voltage and the pull-up voltage of the temperature abnormality detection circuit 250 is low.

  The ground signal GND is a signal of a reference potential of a plurality of signals including the voltages VHV, VDD1, VDD2. Therefore, a current caused by a plurality of signals including the voltages VHV, VDD1, and VDD2 flows through the wiring through which the ground signal GND is propagated. That is, when noise caused by the operation of the drive signal selection circuit 200 is superimposed on the voltages VHV and VDD1, a current caused by the voltages VHV and VDD1 on which the noise is superimposed flows through the wiring through which the ground signal GND is propagated. As a result, noise may be superimposed on the wiring through which the ground signal GND is propagated.

  As described above, the voltage VDD2 is a signal having a more stable potential as compared with the voltages VDD1, VHV and the ground signal GND. As shown in FIG. 20, in the print head control circuit 15 included in the liquid ejection apparatus 1 according to the first embodiment, a wiring 197-23 for transmitting the diagnostic signal DIG-B and a wiring 197- for transmitting the diagnostic signal DIG-A. 25 are provided side by side. In the direction in which the wiring 197-23 and the wiring 197-25 are arranged, the wiring 197-24 through which the voltage VDD2, which is a stable potential, is propagated, and the wiring 197-23 through which the diagnostic signal DIG-B is propagated, Located next to each other. In other words, the wiring 197-24 for transmitting the voltage VDD2 which is a stable potential and the wiring 197-23 for transmitting the diagnostic signal DIG-B are provided on the same cable 19 and are located adjacent to each other. . Here, the term “adjacent” means that the wiring 197-23 and the wiring 197-24 included in the cable 19 are positioned adjacent to each other via an insulator 198 or a space or the like.

  In the print head 21 included in the liquid ejection device 1 according to the first embodiment, the terminal 353-23 to which the diagnostic signal DIG-B is input and the terminal 353-25 to which the diagnostic signal DIG-A is input are arranged side by side. Is provided. In the direction in which the terminals 353-23 and 353-25 are arranged, a terminal 353-24 to which the voltage VDD2 which is a signal of a stable potential is input, and a terminal 353-23 to which the clock signal SCK is input, Located next to each other. In other words, the terminal 353-23 to which the diagnostic signal DIG-B is input and the terminal 353-24 to which the voltage VDD2 is input are provided in the same connector 350 and are located adjacent to each other. Here, “located adjacently” means that the terminals 353-23 and the terminals 353-24 included in the connector 350 are positioned adjacent to each other via an insulator such as the housing 351 or the internal space of the cable attachment portion 352. Including.

  That is, in the connector 350, the terminal 353-24 to which the voltage VDD2 is input is located near the terminal 353-23 to which the diagnostic signal DIG-B is input. In other words, in the connector 350, the shortest distance between the terminal 353-23 and the terminal 353-24 in the direction in which the terminal 353-23 and the terminal 353-25 are arranged is the terminal at which the terminal 353-23 and the voltage VDD1 are input. It is shorter than the shortest distance to the terminal 353-29, and shorter than the shortest distance between the terminal 353-23 and the terminal 353-9 to which the voltage VHV is input.

  Further, in the liquid ejection device 1 according to the first embodiment, the contact portion 180-23 to which the diagnostic signal DIG-B is input and the contact portion 180-25 to which the diagnostic signal DIG-A is input are provided side by side. I have. In the direction in which the contact portions 180-23 and 180-25 are arranged, the contact portion 180-24 to which the voltage VDD2, which is a signal of a stable potential, is inputted, and the contact portion to which the diagnostic signal DIG-B is inputted. 180-23 are located adjacent to each other. In other words, the contact portion 180-23 to which the diagnostic signal DIG-B is input and the contact portion 180-24 to which the voltage VDD2 is input make electrical contact between the same cable 19 and the same connector 350. It is included in the plurality of contact portions 180 and located adjacent to each other. Here, “located adjacently” means that the contact portions 180-23 and 180-24 included in the plurality of contact portions 180 in which the cable 19 and the connector 350 electrically contact each other are insulators such as the housing 351; This includes being located adjacent to each other via an internal space and an insulator 198 included in the cable 19.

  That is, in the plurality of contact portions 180, the terminal 353-24 to which the voltage VDD2 is input is located near the contact portion 180-23 to which the diagnostic signal DIG-B is input. In other words, in the connector 350, the shortest distance between the terminal 353-23 and the terminal 353-24 in the direction in which the terminal 353-23 and the terminal 353-25 are arranged is the terminal at which the terminal 353-23 and the voltage VDD1 are input. It is shorter than the shortest distance to the terminal 353-29, and shorter than the shortest distance between the terminal 353-23 and the terminal 353-9 to which the voltage VHV is input.

  In the print head control circuit 15, the print head 21, and the liquid ejection device 1 configured as described above, the diagnostic signal which is one of the signals for diagnosing whether or not the ink can be normally ejected from the print head 21. A wiring through which the DIG-B is propagated, a terminal to which the diagnostic signal DIG-B is input, and a wiring through which a stable potential voltage VDD2 is propagated adjacent to the wiring and a contact portion where the terminal contacts the wiring. Since the terminal to which the voltage VDD2 is input and the contact portion where the wiring and the terminal are in contact with each other are located, the possibility that the waveform of the diagnostic signal DIG-B is distorted is reduced. Therefore, the possibility that the self-diagnosis function of the print head 21 does not operate normally can be reduced.

  Further, as shown in FIG. 20, the diagnostic signal DIG-B provided adjacent to the voltage VDD2 is propagated through the common wiring 197-23 to the clock signal SCK and may be input to the common terminal 353-23. preferable.

  As described above, the clock signal SCK is a signal for defining the timing at which the print data signal SI is input. Therefore, if noise is superimposed on the clock signal SCK and the waveform of the clock signal SCK is distorted, the timing of the print data signal SI synchronized with the clock signal SCK varies. As a result, the ejection accuracy of the ink ejected from the corresponding plurality of nozzles 651 deteriorates. When the wiring 197-23 provided adjacent to the wiring 197-24 through which the voltage VDD2 is propagated is a wiring that serves both as the diagnostic signal DIG-B and the clock signal SCK, the waveform of the clock signal SCK may be distorted. Is reduced. Therefore, it is possible to improve the ejection accuracy of the ink ejected from the print head 21.

  Similarly, when the terminal 353-23 provided adjacent to the terminal 353-24 to which the voltage VDD2 is input is a terminal that serves both as the diagnostic signal DIG-B and the clock signal SCK, the waveform of the clock signal SCK is distorted. Is less likely to occur. Similarly, the contact portion 180-23 provided adjacent to the contact portion 180-24 to which the voltage VDD2 is input includes a contact portion to which the diagnostic signal DIG-B is input and a contact portion to which the clock signal SCK is input. As a result, the possibility that the waveform of the clock signal SCK is distorted is reduced. Therefore, it is possible to improve the ejection accuracy of the ink ejected from the print head 21.

  As shown in FIG. 20, the wiring 197-23 through which the diagnostic signal DIG-B is propagated and the wiring 197-22 through which the ground signal GND is propagated include the wiring 197-23 and the wiring 197-25. In the direction, the terminal 353-23 to which the diagnostic signal DIG-B is input and the terminal 353-22 to which the ground signal GND is input are arranged side by side with the terminal 353-23 and the terminal 353-25. In the direction, the contact portion 180-23 to which the diagnostic signal DIG-B is input and the contact portion 180-22 to which the ground signal GND is input are adjacent to each other, and the contact portion 180-23 and the contact portion 180-25 Are preferably adjacent to each other in the direction in which In other words, in the cable 19, the wiring 197-23 through which the diagnostic signal DIG-B propagates is located between the wiring 197-24 through which the voltage VDD2 propagates and the wiring 197-22 through which the ground signal GND propagates. In the connector 350, the terminal 353-23 to which the diagnostic signal DIG-B is input is located between the terminal 353-24 to which the voltage VDD2 is input and the terminal 353-22 to which the ground signal GND is input, The contact portion 180-23 to which the diagnostic signal DIG-B is input is preferably located between the contact portion 180-24 to which the voltage VDD2 is input and the contact portion 180-22 to which the ground signal GND is input.

  Accordingly, the wiring 197-22 through which the ground signal GND is propagated, the terminal 353-22 to which the ground signal GND is input, and the contact portion 180-22 to which the ground signal GND is input, cause other signals to interfere with the voltage VDD2. It acts as a shield to reduce Therefore, the possibility that the waveform of the diagnostic signal DIG-B is distorted is further reduced, and the possibility that the self-diagnosis function of the print head 21 does not operate normally can be further reduced. Here, the wiring 197-22 through which the ground signal GND is propagated is an example of the first ground signal propagation wiring in the first embodiment, and is electrically connected to the wiring 197-22 and receives the ground signal GND. The terminal 353-22 is an example of a first ground terminal in the first embodiment, and the contact portion 180-22 in which the wiring 197-22 and the terminal 353-22 are in electrical contact with each other is the first ground terminal in the first embodiment. It is an example of a ground contact part.

As shown in FIG. 20, the wiring 197-24 through which the voltage VDD2 propagates and the wiring 197-9 through which the voltage VHV propagates are adjacent to each other in the direction in which the wiring 197-23 and the wiring 197-25 are arranged. Terminal 353-24 to which the voltage VDD2 is input and the voltage VHV
Is not located adjacent to the terminal 353-9 in the direction in which the terminal 353-23 and the terminal 353-25 are arranged, and the contact portion 180-24 to which the voltage VDD2 is input and the voltage VHV are input. It is preferable that the contact portions 180-9 not be adjacent to each other in the direction in which the contact portions 180-23 and 180-25 are arranged. Further, in this case, the wiring 197-9 for transmitting the voltage VHV and the wiring 197-10 for transmitting the ground signal GND are located adjacent to each other in the direction in which the wiring 197-23 and the wiring 197-25 are arranged. The terminal 353-9 to which the voltage VHV is input and the terminal 353-10 to which the ground signal GND is input are located adjacent to each other in the direction in which the terminal 353-23 and the terminal 353-25 are arranged. The input contact portion 180-9 and the contact portion 180-10 to which the ground signal GND is input are preferably located adjacent to each other in the direction in which the contact portions 180-23 and 180-25 are arranged.

  The voltage VHV has a larger voltage value than the voltages VDD1 and VDD2. Therefore, when a noise component is superimposed on the voltage VHV, a signal transmitted through a wiring adjacent to a wiring through which the voltage VHV is transmitted, a signal input to a terminal adjacent to a terminal to which the voltage VHV is input, and a voltage VHV A noise component included in the voltage VHV may interfere with a signal input to a contact portion adjacent to the input contact portion. That is, the wiring 197-24, the contact portion 180-24, and the terminal 196-24 that propagate the voltage VDD2 having a stable potential and input to the print head 21 are connected to the wiring 197-11 that propagates the voltage VHV and inputs the voltage to the print head 21. When the contact portion 180-11 and the terminal 196-11 are adjacent to each other, the noise component included in the voltage VHV may interfere with the voltage VDD2 having a stable potential. If the noise component interferes with the voltage VDD2, the waveform of the diagnostic signal DIG-B may be distorted.

  Therefore, as shown in FIG. 20, a wiring 197-24 for transmitting the voltage VDD2 is not provided adjacent to the wiring 197-9 for transmitting the voltage VHV, and a terminal 353-9 for receiving the voltage VHV is not provided. In addition, by not providing the terminal 353-24 to which the voltage VDD2 is input, and not providing the contact portion 180-24 to which the voltage VDD2 is input adjacent to the contact portion 180-9 to which the voltage VHV is input, It is possible to further reduce the possibility that the voltage VHV interferes with the voltage VDD2 which is a signal having a stable potential. Further, a wiring 197-10 is provided adjacent to the wiring 197-9 to which the voltage VHV is propagated, and is provided with a ground signal GND. The ground signal GND is input to a terminal 353-9 to which the voltage VHV is input. A terminal 353-10 is provided, and a contact portion 180-10 to which the ground signal GND is input is provided adjacent to the contact portion 180-9 to which the voltage VHV is input, so that the wiring 197-10, the terminal 353-10, And the contact part 180-10 functions as a shield. As a result, it is possible to reduce the possibility that the voltage VHV interferes with another signal including the voltage VDD2. The wiring 197-10 through which the ground signal GND is propagated is an example of the second ground signal propagation wiring in the first embodiment, and the terminal 353-10 to which the ground signal GND is input via the wiring 197-10 is This is an example of a second ground terminal in the first embodiment, and a contact portion 180-10 where the wiring 197-10 and the terminal 353-10 are in electrical contact is an example of a second ground signal contact portion in the first embodiment. is there.

  Here, the connector 350 provided on the print head 21 and having the terminals 353-23, 353-25, 353-21, 353-19, and 353-11 is an example of the first connector in the first embodiment. It is.

1.8 Operational Effects As described above, in the print head control circuit 15 according to the first embodiment, the diagnostic signal DIG-A and the voltage VDD2 propagated by the same cable 19 are provided adjacent to each other. Specifically, the wiring 197-23 transmitting the diagnostic signal DIG-A and the wiring 197-24 transmitting the voltage VDD2 are adjacent to each other in the direction in which the wiring 197-23 and the wiring 197-25 are arranged. To position.

  The voltage VDD2 is a signal propagated through a different wiring from the voltage VDD1 supplied to the drive signal selection circuit 200, and is supplied to a temperature abnormality detection circuit 250 that generates an abnormality signal XHOT. The drive signal selection circuit 200 controls the supply of the drive signal COM to the piezoelectric element 60. That is, the drive signal selection circuit 200 operates at a high speed according to the ejection speed of the ink ejected from the nozzles. Therefore, noise may be superimposed on the voltage VDD1 supplied to the drive signal selection circuit 200 according to the operation of the drive signal selection circuit 200. Then, the voltage VDD1 supplied to the drive signal selection circuit 200 returns via a wiring through which the ground signal GND is propagated. That is, when noise caused by the operation of the drive signal selection circuit 200 is superimposed on the voltage VDD1, a current caused by the voltage VDD1 on which the noise is superimposed flows through the wiring through which the ground signal GND is propagated.

  On the other hand, the temperature abnormality detection circuit 250 diagnoses the presence or absence of the temperature abnormality of the print head 21 and outputs the abnormality signal XHOT. Therefore, when the print head 21 is in the normal temperature range, the logic level does not change. Therefore, the voltage VDD2 supplied to the temperature abnormality detection circuit 250 is a signal having a more stable potential with respect to the voltage VDD1 and the ground signal GND.

  The wiring 197-24 through which the voltage VDD2 having such a stable potential is propagated and the wiring 197-23 through which the diagnostic signal DIG-B is propagated are adjacent to each other in the direction in which the wiring 197-23 and the wiring 197-25 are arranged. By locating, it is possible to reduce the possibility that the waveform of the diagnostic signal DIG-B is distorted in the cable 19. Therefore, the diagnostic signal DIG-B is accurately input to the diagnostic circuit 240. Thereby, the possibility that the self-diagnosis function of the print head 21 does not operate normally can be reduced.

  Similarly, in the print head 21 according to the first embodiment, the terminal 353-23 to which the diagnostic signal DIG-B is input and the terminal 353-24 to which the voltage VDD2 is input are the terminals 353-23 and 353-25. Are located next to each other in the direction in which the contact portions 180-23 to which the diagnostic signal DIG-B is input and the contact portions 180-24 to which the voltage VDD2 is input in the liquid ejection device 1 according to the first embodiment. However, since the contact portions 180-23 and 180-25 are adjacent to each other in the direction in which the contact portions 180-23 are arranged, it is possible to reduce the possibility that the waveform of the diagnostic signal DIG-B is distorted. Therefore, the diagnostic signal DIG-B is accurately input to the diagnostic circuit 240. Thereby, the possibility that the self-diagnosis function of the print head 21 does not operate normally can be reduced.

2. Second Embodiment Next, a liquid ejection device 1, a print head control circuit 15, and a print head 21 according to a second embodiment will be described. In describing the liquid ejection device 1, the print head control circuit 15, and the print head 21 of the second embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted or simplified. There are cases.

FIG. 21 is a diagram schematically illustrating an internal configuration of the liquid ejection device 1 according to the second embodiment when viewed from the Y direction. As shown in FIG. 21, the liquid ejection apparatus 1 according to the second embodiment includes a main board 11, cables 19a and 19b, and a print head 21. That is, in the liquid ejection apparatus 1 of the second embodiment, the main board 11 and the print head 21 are electrically connected by the two cables 19a and 19b, and various signals are propagated by the cables 19a and 19b. Different from the first embodiment. The main board 11 has a connector 12a to which one end of the cable 19a is attached, and a connector 12b to which one end of the cable 19b is attached. The print head 21 includes: a connector 350 to which the other end of the cable 19a is attached; It differs from the first embodiment also in that it has a connector 360 to which the other end of 19b is attached.

  Here, in the liquid ejection apparatus 1 of the second embodiment, a control mechanism 10 that outputs various signals for controlling the operation of the print head 21 and a cable that propagates various signals for controlling the operation of the print head 21 The configuration including 19a and 19b is an example of the print head control circuit 15 that controls the operation of the print head 21 having the function of performing self-diagnosis in the second embodiment.

  Each of the cables 19a and 19b and the cable 19 in the first embodiment have the same configuration except that the numbers of the terminals 195 and 196 and the wiring 197 are different. Therefore, a detailed description of the configuration of the cables 19a and 19b is omitted. In the following description, terminals 195-k provided on cables 19a and 19b are referred to as terminals 195a-k and 195b-k, terminals 196-k are referred to as terminals 196a-k and 196b-k, and wiring 197 is provided. -K is referred to as a wiring 197a-k or 197b-k, and the contact portion 180-k is referred to as a contact portion 180a-k or 180b-k. The terminals 195a-k and 195b-k are electrically connected to the connectors 12a and 12b, respectively, and the terminals 196a-k and 196b-k are connected to the connectors 350 and 195b-k via the contact portions 180a-k and 180b-k. 360 and is electrically connected.

  The print head 21 according to the second embodiment is described as including six drive signal selection circuits 200-1 to 200-6. Therefore, the print head 21 according to the second embodiment has six print data signals SI1 to SI6 corresponding to the six drive signal selection circuits 200-1 to 200-6 and six drive signals COM1 to COM6. COM6 and six reference voltage signals CGND1 to CGND6 are input.

  FIG. 22 is a perspective view illustrating a configuration of the print head 21 according to the second embodiment. As shown in FIG. 22, the print head 21 has a head 310 and a substrate 320. On the lower surface of the head 310 in the Z direction, an ink ejection surface 311 on which a plurality of ejection units 600 are formed is located.

  The substrate 320 has a surface 321 and a surface 322 facing the surface 321, and has a side 323, a side 324 facing the side 323 in the X direction, a side 325, and a side 325 in the Y direction. It is a substantially rectangular shape formed by the opposite side 326. Further, similarly to the first embodiment, an integrated circuit 241 configuring the diagnostic circuit 240 is provided on the side 326 of the surface 321 of the substrate 320.

  The board 320 is provided with connectors 350 and 360. The connector 350 is provided along the side 323 on the surface 321 side of the substrate 320. The connector 360 is provided along the side 323 on the surface 322 side of the substrate 320.

The configuration of the connectors 350 and 360 will be described with reference to FIG. FIG. 23 is a diagram illustrating a configuration of the connectors 350 and 360 according to the second embodiment. The connector 350 has a housing 351, a cable attachment part 352 formed on the housing 351, and a plurality of terminals 353. The plurality of terminals 353 are juxtaposed along the side 323. Specifically, 26 terminals 353 are arranged side by side along side 323. Here, the 26 terminals 353 are referred to as terminals 353-1, 353-2,..., 353-26 in order from the side 325 to the side 326 in the direction along the side 323. The cable attachment portion 352 is located on the substrate 320 side of the plurality of terminals 353 in the Z direction. The cable 19a is attached to the cable attachment part 352. Then, when the cable 19a is attached to the cable attachment portion 352, each of the terminals 196a-1 to 196a-26 included in the cable 19a and each of the terminals 353-1 to 353-26 included in the connector 350 are electrically connected. Contact. In the connector 350, as shown in FIG. 18, a plurality of terminals 353 may be located on the substrate 320 side of the cable attachment portion 352 in the Z direction.

  The connector 360 has a housing 361, a cable attachment portion 362 formed on the housing 361, and a plurality of terminals 363. The plurality of terminals 363 are juxtaposed along the side 323. Specifically, 26 terminals 363 are arranged side by side along side 323. Here, the 26 terminals 363 are referred to as terminals 363-1, 363-2,..., 363-26 in order from the side 325 to the side 326 in the direction along the side 323. The cable attachment portion 362 is located on the substrate 320 side of the plurality of terminals 363 in the Z direction. The cable 19b is attached to the cable attachment portion 362. When the cable 19b is attached to the cable attachment portion 362, each of the terminals 196b-1 to 196b-26 included in the cable 19b and each of the terminals 363-1 to 363-26 included in the connector 360 are electrically connected. Contact.

  Next, the details of signals transmitted through the cables 19a and 19b and input to the print head 21 will be described with reference to FIGS.

  FIG. 24 is a diagram for describing details of a signal propagated through the cable 19a in the second embodiment. As shown in FIG. 24, the cable 19a includes wires for transmitting the drive signals COM1 to COM6, wires for transmitting the reference voltage signals CGND1 to CGND6, a temperature signal TH, a latch signal LAT, a clock signal SCK, A line for transmitting each of the change signal CH, the print data signal SI1, and the abnormal signal XHOT, a line for transmitting each of the diagnostic signals DIG-A to DIG-E, a line for transmitting the voltage VHV, and a plurality of ground signals. And a plurality of wirings that propagate GND.

  More specifically, the drive signals COM1 to COM6 and the reference voltage signals CGND1 to CGND6 are respectively input to the cables 19a from the terminals 195a-1 to 195a-12 and propagated through the wires 197a-1 to 197a-12. After that, the signal is input to each of the terminals 196a-1 to 196a-12 and to each of the terminals 353-1 to 353-12 of the connector 350 via each of the contact portions 180a-1 to 180a-12.

  The diagnostic signal DIG-A and the latch signal LAT are input to the cable 19a from the terminals 195a-23, propagated through the wiring 197a-23, and then transmitted to the terminals of the connector 350 via the terminals 196a-23 and the contact portions 180a-23. 353-23. That is, the wiring 197a-23 serves as a wiring for transmitting the diagnostic signal DIG-A and a wiring for transmitting the latch signal LAT, and the terminal 353-23 has a terminal for inputting the diagnostic signal DIG-A and a wiring for transmitting the latch signal LAT. Also serves as an input terminal. Then, the contact portions 180a-23 are electrically contacted with the wiring transmitting the diagnostic signal DIG-A, and are also in electrical contact with the wiring transmitting the latch signal LAT. The diagnostic signal DIG-A is an example of a second diagnostic signal in the second embodiment, and the wiring 197a-23 for transmitting the diagnostic signal DIG-A is an example of a second diagnostic signal transmitting wiring in the second embodiment. The terminal 353-23 to which the diagnostic signal DIG-A is input is an example of the second terminal in the second embodiment, and the contact portion 180a-23 where the wiring 197a-23 and the terminal 353-23 are in electrical contact is the second terminal. It is an example of the 2nd contact part in a 2nd embodiment.

The diagnostic signal DIG-B and the clock signal SCK are input to the cable 19a from the terminals 195a-21, propagated through the wiring 197a-21, and then transmitted to the terminals of the connector 350 via the terminals 196a-21 and the contact portions 180a-21. 353-21. That is, the wiring 197a-21 serves as a wiring for transmitting the diagnostic signal DIG-B and a wiring for transmitting the clock signal SCK, and the terminal 353-21 has a terminal to which the diagnostic signal DIG-B is input and a terminal for receiving the clock signal SCK. Also serves as an input terminal. Then, the contact portions 180a-21 are electrically contacted with the wiring transmitting the diagnostic signal DIG-B, and are also in electrical contact with the wiring transmitting the clock signal SCK. The diagnostic signal DIG-B is an example of a first diagnostic signal in the second embodiment, and the wiring 197a-21 for transmitting the diagnostic signal DIG-B is an example of a first diagnostic signal propagation wiring in the second embodiment. The terminal 353-21 to which the diagnostic signal DIG-B is input is an example of a first terminal in the second embodiment, and the contact portion 180a-21 where the wiring 197a-21 and the terminal 353-21 are in electrical contact is provided. It is an example of the 1st contact part in a 2nd embodiment.

  The diagnostic signal DIG-C and the change signal CH are input to the cable 19a from the terminals 195a-19, propagated through the wiring 197a-19, and then transmitted to the terminals of the connector 350 via the terminals 196a-19 and the contact portions 180a-19. 353-19. That is, the wiring 197a-19 serves as a wiring for transmitting the diagnostic signal DIG-C and a wiring for transmitting the change signal CH, and the terminal 353-19 has a terminal to which the diagnostic signal DIG-C is input and a terminal for receiving the change signal CH. Also serves as an input terminal. Then, the contact portions 180a-19 are electrically contacted with the wiring transmitting the diagnostic signal DIG-C, and are also in electrical contact with the wiring transmitting the change signal CH. The diagnostic signal DIG-C is an example of the third diagnostic signal in the second embodiment, and the wiring 197a-19 for transmitting the diagnostic signal DIG-C is an example of the third diagnostic signal transmitting wiring in the second embodiment. A terminal 353-19 to which the diagnostic signal DIG-C is input is an example of a third terminal in the second embodiment, and a contact portion 180a-19 where the wiring 197a-19 and the terminal 353-19 are in electrical contact is provided. It is an example of the 3rd contact part in 2nd Embodiment.

  The diagnostic signal DIG-D and the print data signal SI1 are input to the cable 19a from the terminal 195a-17 and propagated through the wiring 197a-17, and then transmitted to the connector 350 via the terminal 196a-17 and the contact portion 180a-17. Input to terminal 353-17. That is, the wiring 197a-17 serves both as a wiring for transmitting the diagnostic signal DIG-D and a wiring for transmitting the print data signal SI1, and the terminal 353-17 is connected to a terminal to which the diagnostic signal DIG-D is input and a print data Also serves as a terminal to which signal SI1 is input. Then, the contact portions 180a-17 are electrically contacted with the wiring transmitting the diagnostic signal DIG-D, and are also in electrical contact with the wiring transmitting the print data signal SI1. The diagnostic signal DIG-D is an example of a fourth diagnostic signal in the second embodiment, and the wiring 197a-17 for transmitting the diagnostic signal DIG-D is an example of a fourth diagnostic signal transmitting wiring in the second embodiment. The terminal 353-17 to which the diagnostic signal DIG-D is input is an example of the fourth terminal in the second embodiment, and the contact portion 180a-17 where the wiring 197a-17 and the terminal 353-17 are electrically connected is the fourth terminal. It is an example of the 4th contact part in a 2nd embodiment.

  The diagnostic signal DIG-E and the abnormal signal XHOT are input to the terminal 353-15 of the connector 350, and are input to the cable 19a via the contact portions 180a-15 and the terminals 196a-15. Then, the diagnostic signal DIG-E and the abnormal signal XHOT are input to the main board 11 from the terminals 195a-15 after being propagated through the wiring 197a-15. That is, the wiring 197a-15 serves as a wiring for transmitting the diagnostic signal DIG-E and a wiring for transmitting the abnormal signal XHOT, and the terminal 353-15 is connected to the terminal to which the diagnostic signal DIG-E is input and the terminal 353-15 for transmitting the abnormal signal XHOT. Also serves as an input terminal. Then, the contact portion 180a-15 is electrically contacted with the wiring for transmitting the diagnostic signal DIG-E and also electrically with the wiring for transmitting the abnormal signal XHOT. The diagnostic signal DIG-E is an example of the fifth diagnostic signal in the second embodiment, and the wiring 197a-15 for transmitting the diagnostic signal DIG-E is an example of the fifth diagnostic signal transmitting wiring in the second embodiment. The terminal 353-15 to which the diagnostic signal DIG-E is input is an example of the fifth terminal in the second embodiment, and the contact portion 180a-15 where the wiring 197a-15 and the terminal 353-15 are in electrical contact is provided. It is an example of the 5th contact part in a 2nd embodiment.

  The temperature signal TH is input to the terminal 353-25 of the connector 350, and is input to the cable 19a via the terminals 196a-25 and the contact portions 180a-25. Then, the temperature signal TH is input to the main substrate 11 from the terminal 195a-25 after being propagated through the wiring 197a-25.

  The voltage VHV is input to the cable 19a from the terminal 195a-13, propagated through the wiring 197a-13, and then input to the terminal 353-13 of the connector 350 via the terminal 196a-13 and the contact portion 180a-13. . This voltage VHV is an example of the third voltage signal in the second embodiment, and the wiring 197a-13 for transmitting the voltage VHV is an example of the third voltage signal transmitting wiring in the second embodiment, and the voltage VHV is input. The terminal 353-13 is an example of an eighth terminal in the second embodiment, and a contact portion 180a-13 where the wiring 197a-13 and the terminal 353-13 are in electrical contact is a contact portion of the eighth contact portion in the second embodiment. This is an example.

  The ground signal GND is input to the cable 19a from each of the terminals 195a-14, 195a-16, 195a-18, 195a-20, 195a-22, 195a-24, 195a-26, and the wirings 197a-14, 197a-16. , 197a-18, 197a-20, 197a-22, 197a-24, 197a-26, and then the terminals 196a-14, 196a-16, 196a-18, 196a-20, 196a-22, 196a. 24, 196a-26 and the contact portions 180a-14, 180a-16, 180a-18, 180a-20, 180a-22, 180a-24, 180a-26, respectively. 14, 353-16, 353-18, 353-20, 353 Is input to each of 22,353-24,353-26.

  Next, the details of the signal propagated through the cable 19b will be described with reference to FIG. FIG. 25 is a diagram for describing details of a signal propagated through the cable 19b in the second embodiment. As shown in FIG. 25, the cable 19b includes a wiring for transmitting each of the drive signals COM1 to COM6, a wiring for transmitting each of the reference voltage signals CGND1 to CGND6, and a wiring for transmitting each of the print data signals SI2 to SI6. And a wiring for transmitting each of the voltages VDD1 and VDD2, and a plurality of wirings for transmitting a plurality of ground signals GND.

  Specifically, each of the drive signals COM1 to COM6 and the reference voltage signals CGND1 to CGND6 is input to the cable 19b from each of the terminals 195b-1 to 195b-12, and propagates through each of the wirings 197b-1 to 197b-12. After that, the signals are input to the terminals 196b-1 to 196b-12 and to the terminals 363-1 to 363-12 of the connector 360 via the contact portions 180b-1 to 180b-12, respectively.

  Each of the print data signals SI2 to SI6 is input to the cable 19b from each of the terminals 195b-24, 195b-22, 195b-20, 195b-18, and 195b-16, and the wirings 197b-24, 197b-22, and 197b- 20, 197b-18, 197b-16, and then the terminals 196b-24, 196b-22, 196b-20, 196b-18, 196b-16, and the contact portions 180b-24, 180b-22, respectively. , 180b-20, 180b-18, and 180b-16, respectively, to the terminals 363-24, 363-22, 363-20, 363-18, 363-16 of the connector 360.

The voltage VDD1 is input to the cable 19b from the terminal 195b-26, propagated through the wiring 197b-26, and then input to the terminal 363-26 of the connector 360 via the terminal 196b-26 and the contact portion 180b-26. . The voltage VDD1 is an example of a first voltage signal in the second embodiment, the wiring 197b-26 for transmitting the voltage VDD1 is an example of a first voltage signal transmission wiring in the second embodiment, and the voltage VDD1 is an input. The terminal 363-26 is an example of the sixth terminal in the second embodiment, and the contact portion 180b-26 where the wiring 197b-26 and the terminal 363-26 are in electrical contact is the sixth terminal in the second embodiment. It is an example of a contact part.

  The voltage VDD2 is input from the terminal 195b-21 to the cable 19b, propagated through the wiring 197b-21, and input to the terminal 363-21 of the connector 360 via the terminal 196b-21 and the contact portion 180b-21. The voltage VDD2 is an example of a second voltage signal in the second embodiment, and the wiring 197b-21 that propagates the voltage VDD2 is an example of a second voltage signal transmission wiring in the second embodiment, and the voltage VDD2 is an input. The terminal 363-21 is an example of the seventh terminal in the second embodiment, and the contact portion 180b-21 where the wiring 197b-21 and the terminal 363-21 make electrical contact is the seventh terminal in the second embodiment. It is an example of a contact part.

  The ground signal GND is input to the cable 19a from each of the terminals 195b-13, 195b-15, 195b-17, 195b-19, 195b-23, and 195b-25, and the wirings 197b-13, 197b-15, and 197b-17 , 197b-19, 197b-23, and 197b-25, and after that, each of the terminals 196b-13, 196b-15, 196b-17, 196b-19, 196b-23, and 196b-25, and the contact portion 180b-13, 180b-15, 180b-17, 180b-19, 180b-23, 180b-25, and the terminals 363-13, 363-15, 363-17, 363-19, 363 of the connector 360 via the respective 180b-25. 23, 363-25.

  In the liquid ejection apparatus 1 according to the second embodiment, as shown in FIGS. 24 and 25, in the print head control circuit 15, in the direction intersecting the direction in which the wirings 197 a-21 and 197 a-23 are arranged, the diagnostic signal DIG The wiring 197a-21 through which −B is propagated and the wiring 197b-21 through which the voltage VDD2 that is a stable potential is propagated are partially overlapped. In other words, in the print head control circuit 15, the wire 197a-21 through which the diagnostic signal DIG-B is propagated and the wire 197b-21 through which the voltage VDD2 having a stable potential is propagated are different from the cable 19a and the cable 19b. And are located opposite to each other.

  Further, in the print head 21, in the direction intersecting with the direction in which the terminals 353-21 and the terminals 353-23 are arranged, the terminal 353-21 to which the diagnostic signal DIG-B is input and the voltage VDD2 which is a stable potential are input. The terminal 363-21 is partially overlapped. In other words, in the print head 21, the terminal 353-21 to which the diagnostic signal DIG-B is input and the terminal 363-21 to which the voltage VDD2 is input are provided in different connectors 350 and 360, and face each other. To position.

  Further, in the liquid ejection device 1, in the direction intersecting with the direction in which the contact portions 180a-21 and 180a-23 are arranged, a voltage having a stable potential with respect to the contact portion 180a-21 to which the diagnostic signal DIG-B is input. The contact portion 180b-21 to which VDD2 is input is partially overlapped. In other words, in the liquid ejection device 1, the contact portion 180a-21 to which the diagnostic signal DIG-B is input and the contact portion 180b-21 to which the voltage VDD2 is input are provided in different connectors 350 and 360, and It is located opposite.

As described above, the wiring 197a-21 through which the diagnostic signal DIG-B, which is one of the signals for diagnosing whether or not the ink can be normally ejected from the print head 21, and the stable potential voltage VDD2 197b-21 is propagated in the direction intersecting with the direction in which the wires 197a-21 and the wires 197a-23 are arranged. The possibility that the waveform of the signal DIG-B is distorted is reduced. Similarly, the terminal 353-21 to which the diagnostic signal DIG-B is input and the terminal 363-21 to which the stable potential voltage VDD2 is input intersect with the direction in which the terminals 353-21 and 353-23 are arranged. In the same direction as in the first embodiment, the possibility that the waveform of the diagnostic signal DIG-B is distorted is reduced by being positioned so as to partially overlap each other. Similarly, the contact portion 180a-21 to which the diagnostic signal DIG-B is input and the contact portion 180b-21 to which the stable potential voltage VDD2 is input are formed by the contact portion 180a-21 and the contact portion 180a-23. In the direction intersecting with the line-up direction, by being positioned so as to partially overlap with each other, the possibility that the waveform of the diagnostic signal DIG-B is distorted is reduced as in the first embodiment. Therefore, the possibility that the self-diagnosis function of the print head 21 does not operate normally can be reduced.

  Here, the position opposite to each other means between the wires 197a-k and 197b-k, between the terminals 353-k and 363-k, and between the contact portions 180a-k and 180b-k. Is not limited to a space, and the substrate 320, the housing 351 of the connector 350, the housing 361 of the connector 360, and the like may be interposed. In other words, the term “opposed” means that when viewed from a specific direction, no other wiring 197 is located between the wirings 197a-k and 197b-k, and the terminals 353-k and 363-k Means that no other terminals 353 and 363 are located between the contact portions 180a-k and the other contact portions 180 are not located between the contact portions 180a-k and 180b-k.

  That is, the wiring 197a-21 through which the diagnostic signal DIG-B, which is one of the signals for diagnosing whether or not the ink can be normally ejected from the print head 21, and the voltage VDD2 having a stable potential are transmitted. When the wiring 197b-21 is provided on different cables 19a and 19b, the wiring 197a-21 and the wiring 197b-21 are located in the vicinity. In other words, the shortest distance between the wiring 197a-21 provided on the cable 19a and the wiring 197b-21 provided on the cable 19b is the same as the wiring 197a-21 provided on the cable 19a and the cable 19b. It is shorter than the shortest distance from the other wiring except for the wiring 197b-21.

  Further, a terminal 353-21 to which a diagnostic signal DIG-B, which is one of signals for diagnosing whether or not ink can be normally ejected from the print head 21, and a voltage VDD2 having a stable potential are transmitted. When the terminal 363-21 and the terminal 363-21 are provided in different connectors 350 and 360, the terminal 353-21 and the terminal 363-21 are located in the vicinity. In other words, the shortest distance between the terminal 353-21 provided on the connector 350 and the terminal 363-21 provided on the connector 360 excludes the terminal 353-21 and the terminal 363-21 provided on the connector 360. It is shorter than the shortest distance to another terminal 363.

  Similarly, a contact portion 180a-21 to which a diagnostic signal DIG-B, which is one of the signals for diagnosing whether or not ink can be normally ejected from the print head 21, is input; The contact portion 180b-21 through which the VDD2 is propagated is different from the plurality of contact portions 180a and the plurality of contact portions 180a where the cable 19a and the connector 350 are in electrical contact, and the cable 19b and the connector 360 are electrically connected. When provided in the plurality of contact portions 180b that come into contact with each other, the contact portions 180a-21 and 180b-21 are located close to each other. In other words, the contact portions 180a-21 included in the plurality of contact portions 180a that make electrical contact between the cable 19a and the connector 350, and the contact portions 180b included in the plurality of contact portions 180b that make electrical contact between the cable 19b and the connector 360 are included. The shortest distance between the contact portion 180b-21 and the contact portion 180b-21 is shorter than the shortest distance between the contact portion 180a-21 and the other contact portion 180b excluding the contact portions 180b-21 included in the plurality of contact portions 180b.

  In the liquid ejecting apparatus 1 according to the second embodiment, the wires 197a-k of the cable 19a and the wires 197b-k of the cable 19b are located opposite to each other, and the terminals 353-k of the connector 350 and the terminals 353-k of the connector 360 are located. Although the description has been made on the assumption that the contact portions 363-k are opposed to each other and the contact portions 180a-k and the contact portions 180b-k are opposed to each other, the present invention is not limited to this.

  As shown in FIGS. 24 and 25, the wiring 197a-21 through which the diagnostic signal DIG-B is propagated and the wiring 197a-22 through which the ground signal GND is propagated are the wiring 197a-21 and the wiring 197a-23. Are preferably adjacent to each other in the direction in which In other words, it is preferable that the wiring 197a-21 through which the diagnostic signal DIG-B propagates and the wiring 197a-22 through which the ground signal GND propagates are provided on the same cable 19a and located adjacent to each other. . The terminal 353-21 to which the diagnostic signal DIG-B is input and the terminal 353-22 to which the ground signal GND is propagated are located adjacent to each other in the direction in which the terminals 353-21 and 353-23 are arranged. Is preferred. In other words, it is preferable that the terminal 353-21 to which the diagnostic signal DIG-B is input is provided in the same connector 350 as the terminal 353-22 to which the ground signal GND is input, and is located adjacent to the terminal 353-22. In addition, the contact portion 180a-21 to which the diagnostic signal DIG-B is input and the contact portion 180a-22 to which the ground signal GND is propagated, in the direction in which the contact portions 180a-21 and 180a-23 are arranged, Preferably, they are located adjacent to each other. In other words, the contact portion 180a-21 to which the diagnostic signal DIG-B is input is formed by a plurality of contacts in which the contact portion 180a-22 to which the ground signal GND is input and the connector 350 to the cable 19a are in electrical contact. Preferably, it is included in the portion 180a and located adjacent to the portion.

  Accordingly, the wiring 197a-22 through which the ground signal GND is propagated, the terminal 353-22 to which the ground signal GND is input, and the contact portion 180a-22 are used as shields that reduce interference of another signal with the voltage VDD2. Function. Therefore, the possibility that the waveform of the diagnosis signal DIG-B is distorted is further reduced, and the possibility that the self-diagnosis function of the print head 21 does not operate normally can be further reduced. The wiring 197a-22 through which the ground signal GND is propagated is an example of a first ground signal propagation wiring in the second embodiment, and the terminal 353-22 to which the ground signal GND is input is the first ground in the second embodiment. This is an example of a terminal, and a contact portion 180a-22 where the wiring 197a-22 and the terminal 353-22 are in electrical contact is an example of a first ground contact portion in the second embodiment.

As shown in FIGS. 23 and 24, the wiring 197b-21 through which the voltage VDD2 propagates and the wiring 197a-13 through which the voltage VHV propagates are in the direction in which the wiring 197a-21 and the wiring 197a-23 are aligned. It is preferable that they are not located adjacent to each other in the direction perpendicular to the direction. In other words, it is preferable that the wiring 197b-21 through which the voltage VDD2 propagates and the wiring 197a-13 through which the voltage VHV propagates are provided on different cables 19a and 19b, and do not face each other. Further, the terminal 363-21 to which the voltage VDD2 is input and the terminal 353-13 to which the voltage VHV is input are not located adjacent to each other in a direction orthogonal to the direction in which the terminals 353-21 and 353-23 are arranged. Is preferred. In other words, it is preferable that the terminal 363-21 to which the voltage VDD2 is input and the terminal 353-13 to which the voltage VHV is input are provided in different connectors 350 and 360, and are not located opposite to each other. The contact portion 180b-21 to which the voltage VDD2 is input and the contact portion 180a-13 to which the voltage VHV is input are adjacent to each other in a direction orthogonal to the direction in which the contact portions 180a-21 and 180a-23 are arranged. It is preferred that they are not located together. In other words, the contact portions 180b-21 to which the voltage VDD2 is input and the contact portions 180a-13 to which the voltage VHV is input include a plurality of contact portions 180a where the cable 19a and the connector 350 are in electrical contact, and a cable It is preferable that the cable 19b different from the connector 19a and the connector 360 different from the connector 350 be provided on the plurality of contact portions 180b different from the plurality of contact portions 180a that are in electrical contact with each other, and not be located opposite to each other. .

  Further, in this case, the wiring 197a-13 for transmitting the voltage VHV and the wiring 197b-13 for transmitting the ground signal GND are adjacent to each other in a direction intersecting the direction in which the wirings 197a-21 and 197a-23 are arranged. It is preferable to be located together. In other words, it is preferable that the wiring 197a-13 for transmitting the voltage VHV and the wiring 197b-13 for transmitting the ground signal GND are provided on different cables 19a and 19b and located opposite to each other. The terminal 353-13 to which the voltage VHV is input and the terminal 363-13 to which the ground signal GND is input are adjacent to each other in a direction intersecting with a direction in which the terminals 353-21 and 353-23 are arranged. Is preferred. In other words, it is preferable that the terminal 353-13 to which the voltage VHV is input and the terminal 363-13 to which the ground signal GND is input are provided in different connectors 350 and 360, and are located opposite to each other. In addition, the contact portion 180a-13 to which the voltage VHV is input and the contact portion 180b-13 to which the ground signal GND is input have a direction intersecting with the direction in which the contact portions 180a-21 and 180a-23 are arranged. Preferably, they are located adjacent to each other. In other words, the contact portion 180a-13 to which the voltage VHV is input and the contact portion 180b-13 to which the ground signal GND is input include a plurality of contact portions 180a in which the cable 19a and the connector 350 are in electrical contact, The cable 19b different from the cable 19a and the plurality of contact portions 180b different from the plurality of contact portions 180a electrically connected to the connector 360 different from the connector 350 may be located opposite to each other. preferable.

  The voltage VHV has a larger voltage value than the voltages VDD1 and VDD2. Therefore, when a noise component is superimposed on the voltage VHV, a signal transmitted through a wiring opposite to a wiring through which the voltage VHV propagates, and a signal input to a terminal opposite to a terminal to which the voltage VHV is input, Noise components included in the voltage VHV may interfere with each other. Therefore, when the wiring 197b-21 transmitting the voltage VDD2 having a stable potential is located opposite to the wiring 197a-13 transmitting the voltage VHV, there is a possibility that a noise component included in the voltage VHV may interfere with the voltage VDD2. is there. If the noise component interferes with the voltage VDD2, the waveform of the diagnostic signal DIG-B may be distorted.

  As shown in FIGS. 24 and 25, in the print head control circuit 15, the print head 21, and the liquid ejection device 1 according to the second embodiment, the voltage VDD2 propagates opposite to the wiring 197a-13 through which the voltage VHV propagates. The contact portion 180a-13 to which the voltage VHV is input without the terminal 363-21 to which the voltage VDD2 is input is provided opposite to the terminal 353-13 to which the voltage VHV is input without providing the wiring 197b-21 to be connected. By not providing the contact portion 180b-21 to which the voltage VDD2 is input, the possibility that the voltage VHV interferes with the voltage VDD2 which is a signal of a stable potential can be reduced.

Further, a wiring 197b-13 through which the ground signal GND is propagated is provided opposite to the wiring 197-11 through which the voltage VHV propagates, and the ground signal GND is input through a terminal 353-13 through which the voltage VHV is input. Terminal 363-13, and a contact portion 180b-13, to which the ground signal GND is input, facing the contact portion 180a-13, to which the voltage VHV is input, thereby providing the voltage VHV similarly to the first embodiment. Can reduce the possibility of interference with other signals including the voltage VDD2. The wiring 197b-13 through which the ground signal GND is propagated is an example of a second ground signal propagation wiring in the second embodiment, and the terminal 363-13 to which the ground signal GND is input via the wiring 197b-13 is This is an example of a second ground terminal in the second embodiment, and a contact portion 180b-13 where the wiring 197b-13 and the terminal 363-13 are in electrical contact is an example of a second ground contact portion in the second embodiment. .

  Here, the connector 350 provided on the print head 21 and having the terminals 353-21, 353-23, 353-19, and 353-17 is an example of the first connector in the second embodiment.

3. Third Embodiment Next, a description will be given of a liquid ejection apparatus 1, a print head control circuit 15, and a print head 21 according to a third embodiment. In describing the liquid ejection device 1, the printhead control circuit 15, and the printhead 21 of the third embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted or simplified. There are cases.

  FIG. 26 is a block diagram illustrating an electrical configuration of the liquid ejection device 1 according to the third embodiment. As shown in FIG. 26, the control circuit 100 according to the third embodiment includes two latch signals LAT1 and LAT2 that define the ejection timing of the print head 21, and two change signals that define the timing of switching the waveform of the drive signal COM. The first embodiment differs from the first embodiment in that CH1 and CH2 and two clock signals SCK1 and SCK2 for defining the timing at which the print data signal SI is input are generated and output to the print head 21. Further, the control circuit 100 generates diagnostic signals DIG-A to DIG-D and DIG-F to DIG-I for diagnosing whether or not the print head 21 can discharge the liquid normally. Is different from the first embodiment.

  In the liquid ejection apparatus 1 according to the second embodiment, the diagnostic signal DIG-A, the latch signal LAT1, the diagnostic signal DIG-B, the clock signal SCK1, the diagnostic signal DIG-C, the change signal CH1, the diagnostic signal DIG-D, and the print data signal SI1, the diagnostic signal DIG-F and the latch signal LAT2, the diagnostic signal DIG-G and the clock signal SCK2, the diagnostic signal DIG-H and the change signal CH2, and the diagnostic signal DIG-I and the print data signal SIn via common wiring. The data is output to a diagnostic circuit 240 included in the print head 21.

  The diagnostic circuit 240 diagnoses whether or not normal ink ejection is possible based on each of the diagnostic signals DIG-A to DIG-D and the diagnostic signals DIG-F to DIG-I. When the diagnostic circuit 240 diagnoses that the normal ejection of the ink in the print head 21 is possible based on the diagnostic signals DIG-A to DIG-D, the diagnostic circuit 240 is connected to the diagnostic signals DIG-A to DIG-C via a common wiring. The latch signal LAT1, the clock signal SCK1, and the change signal CH1 are output as the latch signal cLAT1, the clock signal cSCK1, and the change signal cCH1. When the diagnostic circuit 240 diagnoses that the ink can be normally ejected from the print head 21 based on the diagnostic signals DIG-F to DIG-I, the same wiring as the diagnostic signals DIG-F to DIG-H is used. The latch signal LAT2, the clock signal SCK2, and the change signal CH2, which are input via the CPU, are output as the latch signal cLAT2, the clock signal cSCK2, and the change signal cCH2.

  Here, among the signals input to the diagnostic circuit 240, the print data signal SI1 input through the same wiring as the diagnostic signal DIG-D is branched in the print head 21, and one of the branched signals is The other signal is input to the diagnostic circuit 240, and the other signal is input to the drive signal selection circuit 200-1. The print data signal SIn, which is input to the diagnostic circuit 240 through the same wiring as the diagnostic signal DIG-I, is branched in the print head 21 and then one of the branched signals is diagnosed. The other signal is input to the circuit 240, and the other signal is input to the drive signal selection circuit 200-n.

FIG. 27 is a diagram schematically illustrating an internal configuration of the liquid ejection device 1 according to the third embodiment when viewed from the Y direction. As shown in FIG. 27, the liquid ejection apparatus 1 according to the third embodiment includes a main board 11, cables 19a, 19b, 19c, 19d, and a print head 21. That is, in the liquid ejection device 1 of the third embodiment, the main board 11 and the print head 21 are electrically connected by the four cables 19a, 19b, 19c, and 19d, and various signals are transmitted by the four cables 19a, 19b, It differs from the first embodiment in that it is propagated at 19c and 19d. The main board 11 includes a connector 12a to which one end of the cable 19a is attached, a connector 12b to which one end of the cable 19b is attached, a connector 12c to which one end of the cable 19c is attached, and a connector 12d to which one end of the cable 19d is attached. The print head 21 includes a connector 350 to which the other end of the cable 19a is attached, a connector 360 to which the other end of the cable 19b is attached, a connector 370 to which the other end of the cable 19c is attached, and a other end of the cable 19d. And the connector 380 to which the first embodiment is attached.

  Here, in the liquid ejection apparatus 1 according to the third embodiment, a control mechanism 10 that outputs various signals for controlling the operation of the print head 21 and a cable that propagates various signals for controlling the operation of the print head 21 The configuration including 19a, 19b, 19c, and 19d is an example of the print head control circuit 15 that controls the operation of the print head 21 having the self-diagnosis function in the third embodiment.

  Each of the cables 19a, 19b, 19c, 19d and the cable 19 in the first embodiment have the same configuration except that the number of the terminals 195, 196 and the wires 197 are different. Therefore, a detailed description of the configuration of the cables 19a, 19b, 19c, and 19d is omitted. In the following description, the terminals 195-k provided on the cables 19a, 19b, 19c, and 19d are referred to as terminals 195a-k, 195b-k, 195c-k, and 195d-k, respectively. Each of them is referred to as a terminal 196a-k, 196b-k, 196c-k, 196d-k, and each of the wirings 197-k is referred to as a wiring 197a-k, 197b-k, 197c-k, 197d-k. Each of the portions 180-k is referred to as a contact portion 180a-k, 180b-k, 180c-k, 180d-k. Each of the terminals 195a-k, 195b-k, 195c-k, and 195b-k is electrically connected to each of the connectors 12a, 12b, 12c, and 12d, and the terminals 196a-k, 196b-k, and 196c-k are connected. k, 196d-k are electrically connected to connectors 350, 360, 370, 380 via contact portions 180a-k, 180b-k, 180c-k, 180d-k, respectively.

  The print head 21 according to the third embodiment will be described as including ten drive signal selection circuits 200-1 to 200-10. Therefore, in the print head 21 according to the third embodiment, ten print data signals SI1 to SI10 corresponding to the ten drive signal selection circuits 200-1 to 200-10 and ten drive signals COM1 to COM10, respectively. COM10 and ten reference voltage signals CGND1 to CGND10 are input.

  FIG. 28 is a perspective view illustrating the configuration of the print head 21 according to the third embodiment. As shown in FIG. 28, the print head 21 has a head 310 and a substrate 320. On the lower surface of the head 310 in the Z direction, an ink ejection surface 311 on which a plurality of ejection units 600 are formed is located.

  The substrate 320 has a surface 321 and a surface 322 facing the surface 321, and has a side 323, a side 324 facing the side 323 in the X direction, a side 325, and a side 325 in the Y direction. It is a substantially rectangular shape formed by the opposite side 326. Further, similarly to the first embodiment, an integrated circuit 241 configuring the diagnostic circuit 240 is provided on the side 326 of the surface 321 of the substrate 320.

  The board 320 is provided with connectors 350, 360, 370, and 380. The connector 350 is provided along the side 323 on the surface 321 side of the substrate 320. The connector 360 is provided along the side 323 on the surface 322 of the substrate 320. Here, the connector 350 and the connector 360 in the third embodiment are different from the second embodiment only in that the number of included terminals is 20, and the other configuration is the same as the configuration shown in FIG. Therefore, a detailed description of the connector 350 and the connector 360 in the third embodiment will be omitted. Note that, in the direction along the side 323, the twenty terminals 353 provided side by side with the connector 350 in the third embodiment are sequentially arranged from the side 325 to the side 326 in order from the terminals 353-1, 353-2. , 353-20, and the twenty terminals 363 arranged in parallel with the connector 360 are arranged in the direction along the side 323 from the side 325 to the side 326 in order from the terminals 363-1, 363. -2, ..., 363-20.

  The connector 370 is provided along the side 324 on the surface 321 side of the substrate 320. The connector 380 is provided along the side 324 on the surface 322 of the substrate 320.

  The configuration of the connectors 370 and 380 will be described with reference to FIG. FIG. 29 is a diagram illustrating a configuration of connectors 370 and 380 according to the third embodiment. The connector 370 has a housing 371, a cable attachment portion 372 formed in the housing 371, and a plurality of terminals 373. The plurality of terminals 373 are juxtaposed along the side 324. Specifically, twenty terminals 373 are arranged side by side along side 324. Here, the twenty terminals 373 are referred to as terminals 373-1, 373-2,..., 373-20 in order from the side 325 to the side 326 in the direction along the side 324. The cable attachment portion 372 is located on the substrate 320 side of the plurality of terminals 373 in the Z direction. The cable 19c is attached to the cable attachment portion 372. When the cable 19c is attached to the cable attaching portion 372, each of the terminals 196c-1 to 196c-20 included in the cable 19c and each of the terminals 373-1 to 373-20 included in the connector 370 are electrically connected. Connection. Note that, in the connector 370, similarly to FIG. 18, the plurality of terminals 373 may be located on the substrate 320 side of the cable attachment portion 352 in the Z direction.

  The connector 380 has a housing 381, a cable attachment portion 382 formed on the housing 381, and a plurality of terminals 383. The plurality of terminals 383 are juxtaposed along the side 324. Specifically, twenty terminals 383 are arranged side by side along side 324. Here, the twenty terminals 383 are referred to as terminals 383-1, 383-2,..., 383-20 in order from the side 325 to the side 326 in the direction along the side 324. The cable attachment portion 382 is located on the substrate 320 of the plurality of terminals 383 in the Z direction. The cable 19d is attached to the cable attachment portion 382. When the cable 19d is attached to the cable attachment portion 382, each of the terminals 196d-1 to 196d-20 included in the cable 19d and each of the terminals 383-1 to 383-20 included in the connector 380 are electrically connected. Connection.

  Next, the details of signals transmitted through the cables 19a, 19b, 19c, and 19d and input to the print head 21 will be described with reference to FIGS.

FIG. 30 is a diagram for describing details of a signal propagated through the cable 19a in the third embodiment. As shown in FIG. 30, the cable 19a includes a wiring for transmitting each of the drive signals COM1 to COM5, a wiring for transmitting each of the reference voltage signals CGND1 to CGND5, a temperature signal TH, a latch signal LAT1, a clock signal SCK1, Change signal CH
1 and the print data signal SI1, a wire for transmitting each of the diagnostic signals DIG-A to DIG-D, and a plurality of wires for transmitting a plurality of ground signals GND.

  Specifically, each of the drive signals COM1 to COM5 and the reference voltage signals CGND1 to CGND5 is input to the cable 19a from each of the terminals 195a-1 to 195a-10, and propagates through each of the wirings 197a-1 to 197a-10. After that, the signal is input to each of the terminals 196a-1 to 196a-10 and to each of the terminals 353-1 to 353-10 of the connector 350 via each of the contact portions 180a-1 to 180a-10.

  The diagnostic signal DIG-A and the latch signal LAT1 are input to the cable 19a from the terminals 195a-17, propagated through the wiring 197a-17, and then transmitted to the terminals of the connector 350 via the terminals 196a-17 and the contact portions 180a-17. 353-17. That is, the wiring 197a-17 serves as a wiring for transmitting the diagnostic signal DIG-A and a wiring for transmitting the latch signal LAT1, and the terminal 353-17 has a terminal for inputting the diagnostic signal DIG-A and a signal for receiving the latch signal LAT1. Also serves as an input terminal. Then, the contact portions 180a-17 are electrically contacted with the wiring transmitting the diagnostic signal DIG-A, and are also in electrical contact with the wiring transmitting the latch signal LAT1.

  The diagnostic signal DIG-B and the clock signal SCK1 are input to the cable 19a from the terminals 195a-15, propagated through the wiring 197a-15, and then transmitted to the terminals of the connector 350 via the terminals 196a-15 and the contact portions 180a-15. 353-15. That is, the wiring 197a-15 serves as a wiring for transmitting the diagnostic signal DIG-B and a wiring for transmitting the clock signal SCK1, and the terminal 353-15 is connected to a terminal to which the diagnostic signal DIG-B is input and the clock signal SCK1. Also serves as an input terminal. Then, the contact portions 180a-15 are electrically contacted with the wiring transmitting the diagnostic signal DIG-B, and are also in electrical contact with the wiring transmitting the clock signal SCK1.

  The diagnostic signal DIG-C and the change signal CH1 are input to the cable 19a from the terminals 195a-13, propagated through the wiring 197a-13, and then transmitted to the terminals of the connector 350 via the terminals 196a-13 and the contact portions 180a-13. 353-13. That is, the wiring 197a-13 serves as a wiring for transmitting the diagnostic signal DIG-C and a wiring for transmitting the change signal CH1, and the terminal 353-13 has a terminal to which the diagnostic signal DIG-C is input and a terminal for receiving the change signal CH1. Also serves as an input terminal. Then, the contact portions 180a-13 are electrically contacted with the wiring transmitting the diagnostic signal DIG-C, and are also in electrical contact with the wiring transmitting the change signal CH1.

  The diagnostic signal DIG-D and the print data signal SI1 are input to the cable 19a from the terminal 195a-11, propagated through the wiring 197a-11, and then transmitted to the connector 350 via the terminal 196a-11 and the contact portion 180a-11. Input to terminal 353-11. That is, the wiring 197a-11 serves as a wiring for transmitting the diagnostic signal DIG-D and a wiring for transmitting the print data signal SI1, and the terminal 353-11 is connected to a terminal to which the diagnostic signal DIG-D is input and a print data signal. Also serves as a terminal to which SI1 is input. Then, the contact portion 180a-11 is electrically contacted with the wiring for transmitting the diagnostic signal DIG-D and also electrically with the wiring for transmitting the print data signal SI1.

  The temperature signal TH is input to the terminal 353-19 of the connector 350, and is input to the cable 19a via the contact portions 180a-19 and the terminals 196a-19. Then, the temperature signal TH is input to the main board 11 from the terminals 195a-19 after being propagated through the wirings 197a-19.

  The ground signal GND is input to the cable 19a from each of the terminals 195a-12, 195a-14, 195a-16, 195a-18, 195a-20, and the wires 197a-12, 197a-14, 197a-16, 197a-18 , 197a-20, and 196a-12, 196a-14, 196a-16, 196a-18, 196a-20, and the contact portions 180a-12, 180a-14, 180a-16, respectively. It is input to each of the terminals 353-12, 353-14, 353-16, 353-18, 353-20 of the connector 350 via 180a-18 and 180a-20, respectively.

  FIG. 31 is a diagram for describing details of a signal propagated through the cable 19b in the third embodiment. As shown in FIG. 31, the cable 19b includes a wiring for transmitting each of the drive signals COM1 to COM5, a wiring for transmitting each of the reference voltage signals CGND1 to CGND5, and a wiring for transmitting each of the print data signals SI2 to SI5. And a wiring for transmitting the voltage VDD1, and a plurality of wirings for transmitting the plurality of ground signals GND.

  Specifically, each of the drive signals COM1 to COM5 and the reference voltage signals CGND1 to CGND5 is input to the cable 19b from each of the terminals 195b-1 to 195b-10, and propagates through each of the wirings 197b-1 to 197b-10. After that, the signal is input to each of the terminals 196b-1 to 196b-10 and to each of the terminals 363-1 to 363-10 of the connector 360 via each of the contact portions 180b-1 to 180b-10.

  Each of the print data signals SI2 to SI5 is input to the cable 19b from each of the terminals 195b-18, 195b-16, 195b-14, 195b-12, and is connected to the wiring 197b-18, 197b-16, 197b-14, 197b-. After being propagated in each of the contact portions 196b-18, 196b-16, 196b-14, 196b-12, and the contact portions 180b-18, 180b-16, 180b-14, 180b-12, respectively. The signal is input to each of the terminals 363-18, 363-16, 363-14, and 363-12 of the connector 360.

  The voltage VDD1 is input to the cable 19b from the terminal 195b-20, propagated through the wiring 197b-20, and then input to the terminal 363-20 of the connector 360 via the terminal 196b-20 and the contact portion 180b-20. . This voltage VDD1 is an example of the first voltage signal in the third embodiment, the wiring 197b-20 that propagates the voltage VDD1 is an example of the first voltage signal transmission wiring in the third embodiment, and the voltage VDD1 is an input. The terminal 363-20 is an example of the sixth terminal in the third embodiment, and the contact portion 180b-20 where the wiring 197b-20 and the terminal 363-20 are in electrical contact is the third terminal in the third embodiment. 6 is an example of a contact portion.

  The ground signal GND is input to the cable 19b from each of the terminals 195b-11, 195b-13, 195b-15, 195b-17, and 195b-19, and the wires 197b-11, 197b-13, 197b-15, and 197b-17 , 197b-19, 196b-19, 196b-13, 196b-15, 196b-17, 196b-19, and contact portions 180b-11, 180b-13, 180b-15, respectively. The signal is input to each of the terminals 363-11, 363-13, 363-15, 363-17, and 363-19 of the connector 360 via 180b-17 and 180b-19, respectively.

FIG. 32 is a diagram for describing details of a signal propagated by the cable 19c in the third embodiment. As shown in FIG. 32, the cable 19c is connected to the drive signals COM6 to COM10.
A wiring for transmitting each of the reference voltage signals CGND6 to CGND10, and a wiring for transmitting each of the abnormal signal XHOT, the latch signal LAT2, the clock signal SCK2, the change signal CH2, and the print data signal SI10. It includes a wiring for transmitting each of the diagnostic signals DIG-E to DIG-I, and a plurality of wirings for transmitting a plurality of ground signals GND.

  Specifically, each of the drive signals COM6 to COM10 and the reference voltage signals CGND6 to CGND10 is input to the cable 19c from each of the terminals 195c-1 to 195c-10 and each of the contact portions 180c-1 to 180c-10. After being propagated on each of the wirings 197c-1 to 197c-10, it is input to each of the terminals 373-1 to 373-10 of the connector 370 via each of the terminals 196c-1 to 196c-10.

  The diagnostic signal DIG-E and the abnormal signal XHOT are input to the terminal 373-12 of the connector 370, and are input to the cable 19c via the contact portion 180c-12 and the terminal 196c-12. Then, the diagnostic signal DIG-E is input to the main board 11 from the terminal 195c-12 after being propagated through the wiring 197c-12. That is, the wiring 197 c-12 serves as a wiring for transmitting the diagnostic signal DIG-E and a wiring for transmitting the abnormal signal XHOT, and the terminal 373-12 is connected to a terminal to which the diagnostic signal DIG-E is input and a terminal for receiving the abnormal signal. Also serves as a terminal to which XHOT is input. Then, the contact portion 180c-12 is electrically contacted with the wiring for transmitting the diagnostic signal DIG-E and also electrically with the wiring for transmitting the abnormal signal XHOT. The diagnostic signal DIG-E is an example of a fifth diagnostic signal in the third embodiment, and a wiring 197c-12 for transmitting the diagnostic signal DIG-E is an example of a fifth diagnostic signal propagation wiring in the third embodiment. The terminal 373-12 to which the diagnostic signal DIG-E is input is an example of the fifth terminal in the third embodiment, and the contact portion 180c-12 in which the wiring 197c-12 and the terminal 373-12 are in electrical contact is the third terminal. It is an example of the 5th contact part in a 3rd embodiment.

  The diagnostic signal DIG-F and the latch signal LAT2 are input to the cable 19c from the terminal 195c-14, propagated through the wiring 197c-14, and then transmitted to the terminal 196c-14 via the terminal 196c-14 and the contact portion 180c-14. 373-14. That is, the wiring 197c-14 serves as a wiring for transmitting the diagnostic signal DIG-F and a wiring for transmitting the latch signal LAT2, and the terminal 373-14 is connected to a terminal to which the diagnostic signal DIG-F is input and the terminal for receiving the latch signal LAT2. Also serves as an input terminal. Then, the contact portion 180c-14 is electrically contacted with the wiring transmitting the diagnostic signal DIG-F, and is also in electrical contact with the wiring transmitting the latch signal LAT2. The diagnostic signal DIG-F is an example of a second diagnostic signal in the third embodiment, and the wiring 197c-14 for transmitting the diagnostic signal DIG-F is an example of a second diagnostic signal propagation wiring in the third embodiment. The terminal 373-14 to which the diagnostic signal DIG-F is input is an example of a second terminal in the third embodiment, and the contact portion 180c-14 in which the wiring 197c-14 and the terminal 373-14 are in electrical contact is a third terminal. It is an example of the 2nd contact part in a 3rd embodiment.

The diagnostic signal DIG-G and the clock signal SCK2 are input to the cable 19c from the terminal 195c-16 and propagated through the wiring 197c-16, and then transmitted to the terminal 196c-16 and the terminal of the connector 370 via the contact portion 180c-16. 373-16. That is, the wiring 197c-16 serves as a wiring for transmitting the diagnostic signal DIG-G and a wiring for transmitting the clock signal SCK2, and the terminal 373-16 is connected to a terminal to which the diagnostic signal DIG-G is input and a clock signal SCK2. Also serves as an input terminal. Then, the contact portion 180c-16 is electrically contacted with the wiring for transmitting the diagnostic signal DIG-G, and is also in electrical contact with the wiring for transmitting the clock signal SCK2. The diagnostic signal DIG-G is an example of a first diagnostic signal in the third embodiment, and a wiring 197c-16 for transmitting the diagnostic signal DIG-G is an example of a first diagnostic signal propagation wiring in the third embodiment. Terminal 3 to which diagnostic signal DIG-G is input
73-16 is an example of a first terminal in the third embodiment, and a contact portion 180c-16 where the wiring 197c-16 and the terminal 373-16 make electrical contact is a first contact portion in the third embodiment. This is an example.

  The diagnostic signal DIG-H and the change signal CH2 are input to the cable 19c from the terminal 195c-18, propagated through the wiring 197c-18, and then transmitted to the terminal 196c-18 and the terminal of the connector 370 via the contact portion 180c-18. 373-18. That is, the wiring 197c-18 serves as a wiring for transmitting the diagnostic signal DIG-H and a wiring for transmitting the change signal CH2, and the terminal 373-18 has a terminal for inputting the diagnostic signal DIG-H and a terminal for receiving the change signal CH2. Also serves as an input terminal. Then, the contact portion 180c-18 is electrically contacted with the wiring transmitting the diagnostic signal DIG-H, and is also in electrical contact with the wiring transmitting the change signal CH2. The diagnostic signal DIG-H is an example of the third diagnostic signal in the third embodiment, and the wiring 197c-18 for transmitting the diagnostic signal DIG-H is an example of the third diagnostic signal propagation wiring in the third embodiment. The terminal 373-18 to which the diagnostic signal DIG-H is input is an example of the third terminal in the third embodiment, and the contact portion 180c-18 where the wiring 197c-18 and the terminal 373-18 are in electrical contact is the third terminal. It is an example of the 3rd contact part in a 3rd embodiment.

  The diagnostic signal DIG-I and the print data signal SI10 are input to the cable 19c from the terminal 195c-20, propagated through the wiring 197c-20, and then transmitted to the connector 370 via the terminal 196c-20 and the contact portion 180c-20. Input to terminal 373-20. That is, the wiring 197c-20 functions as a wiring for transmitting the diagnostic signal DIG-I and a wiring for transmitting the print data signal SI10, and the terminal 373-20 is connected to a terminal to which the diagnostic signal DIG-I is input and a print data signal. Also serves as a terminal to which SI10 is input. The contact portion 180c-20 is electrically contacted with the wiring for transmitting the diagnostic signal DIG-I, and is also in electrical contact with the wiring for transmitting the print data signal SI10. The diagnostic signal DIG-I is an example of the fourth diagnostic signal in the third embodiment, and the wiring 197c-20 for transmitting the diagnostic signal DIG-I is an example of the fourth diagnostic signal transmitting wiring in the third embodiment. The terminal 373-20 to which the diagnostic signal DIG-I is input is an example of the fourth terminal in the third embodiment, and the contact portion 180c-20 where the wiring 197c-20 and the terminal 373-20 are in electrical contact is the fourth terminal. It is an example of the 4th contact part in a 3rd embodiment.

  The ground signal GND is input to the cable 19c from each of the terminals 195c-11, 195c-13, 195c-15, 195c-17, and 195c-19, and the wirings 197c-11, 197c-13, 197c-15, and 197c-17 , 197c-19, and 196c-11, 196c-13, 196c-15, 196c-17, 196c-19, and the contact portions 180c-11, 180c-13, 180c-15, respectively. The signal is input to each of the terminals 373-11, 373-13, 373-15, 373-17, and 373-19 of the connector 370 through 180c-17 and 180c-19, respectively. Here, at least one of the wiring 197c-15 and the wiring 197c-17 which are adjacent to the wiring 197c-16 through which the diagnostic signal DIG-G is propagated and which propagate the ground signal GND are the first ground signal propagation in the third embodiment. This is an example of wiring, and at least one of the terminal 373-15 and the terminal 373-17 to which the ground signal GND propagated through the wiring 197c-15 and the wiring 197c-17 is connected to the first ground terminal in the third embodiment. For example, at least one of the wiring 197c-15 and the wiring 197c-17 and at least one of the terminal 373-15 and the terminal 373-17 are electrically connected to the contact portions 180c-15 and 180c-17. At least one is an example of a first ground contact portion.

FIG. 33 is a diagram for describing details of a signal propagated through the cable 19d in the third embodiment. As shown in FIG. 32, the cable 19d includes a wiring for transmitting each of the drive signals COM6 to COM10, a wiring for transmitting each of the reference voltage signals CGND6 to CGND10, and a wiring for transmitting each of the print data signals SI6 to DI9. And wires for transmitting the voltages VHV and VDD2, and a plurality of wires for transmitting the plurality of ground signals GND.

  Specifically, each of the drive signals COM6 to COM10 and the reference voltage signals CGND6 to CGND10 is input to the cable 19d from each of the terminals 195d-1 to 195d-10, and propagates through each of the wirings 197d-1 to 197d-10. After that, the signal is inputted to each of the terminals 196d-1 to 196d-10 and to each of the terminals 383-1 to 383-10 of the connector 380 via each of the contact portions 180d-1 to 180d-10.

  Each of the print data signals SI6 to SI9 is input to the cable 19d from each of the terminals 195d-13, 195d-15, 195d-17, and 195d-19, and the wiring 197d-13, 197d-15, 197d-17, 197d- After being propagated at each of the terminals 19, 19d, 196d-15, 196d-17, and 196d-19, and the contact portions 180d-13, 180d-15, 180d-17, and 180d-19, respectively. Input to the terminals 383-13, 383-15, 383-17, 383-19 of the connector 380.

  The voltage VHV is input to the cable 19d from the terminal 195d-11, propagated through the wiring 197d-11, and then input to the terminal 383-11 of the connector 380 via the terminal 196d-11 and the contact portion 180d-11. . This voltage VHV is an example of a third voltage signal in the third embodiment. A wiring 197d-11 for transmitting the voltage VHV is an example of a third voltage signal transmission wiring in the third embodiment. The terminal 383-11 is an example of the eighth terminal in the third embodiment, and the contact portion 180d-11 in which the wiring 197d-11 and the terminal 383-11 are in electrical contact is the third terminal in the third embodiment. 8 is an example of a contact section.

  The voltage VDD2 is input to the cable 19d from the terminal 195d-16, propagated through the wiring 197d-16, and then input to the terminal 383-16 of the connector 380 via the terminal 196d-16 and the contact portion 180d-16. This voltage VDD2 is an example of a second voltage signal in the third embodiment, a wiring 197d-16 that propagates the voltage VDD2 is an example of a second voltage signal transmission wiring in the third embodiment, and the voltage VDD2 is an input. The terminal 383-16 is an example of the seventh terminal in the third embodiment, and the contact portion 180d-16 where the wiring 197d-16 and the terminal 383-16 are in electrical contact is the third terminal in the third embodiment. 7 is an example of a contact portion.

  The ground signal GND is input to the cable 19d from each of the terminals 195d-12, 195d-14, 195d-18, and 195d-20, and propagates through the wires 197d-12, 197d-14, 197d-18, and 197d-20. After that, the terminals of the connector 380 are connected via the terminals 196d-12, 196d-14, 196d-18, 196d-20 and the contact portions 180d-12, 180d-14, 180d-18, 180d-20, respectively. 383-12, 383-14, 383-18, 383-20. Here, a wiring 197d-10 adjacent to the wiring 197d-11 for transmitting the voltage VHV and transmitting the ground signal GND is an example of a second ground signal transmitting wiring in the third embodiment. The terminal 383-11 to which the propagated ground signal GND is input is an example of the second ground terminal in the third embodiment, and the contact portion 180d- in which the wiring 197d-11 and the terminal 383-11 are in electrical contact. 11 is an example of a second ground contact portion in the third embodiment.

  As described above, in the liquid ejection device 1, the print head 21, and the print head control circuit 15 of the third embodiment, the wiring 197c-16 through which the diagnostic signal DIG-G is propagated and the wiring 197d-16 through which the voltage VDD2 is propagated Are provided on different cables 19c and 19d, and are located opposite to each other. A terminal 373-16 to which the diagnostic signal DIG-G is input and a terminal 383-16 to which the voltage VDD2 is input have different connectors 370 and It is provided on the connector 380 and is located opposite. Accordingly, the same effects as those of the first embodiment can be obtained in the liquid ejection device 1, the print head 21, and the print head control circuit 15 of the third embodiment.

  Although the embodiments and the modified examples have been described above, the present invention is not limited to these embodiments, and can be implemented in various modes without departing from the gist thereof. For example, the above embodiments can be appropriately combined.

  The present invention includes substantially the same configuration as the configuration described in the embodiment (for example, a configuration having the same function, method, and result, or a configuration having the same object and effect). Further, the invention includes a configuration in which a non-essential part of the configuration described in the embodiment is replaced. Further, the invention includes a configuration having the same operation and effect as the configuration described in the embodiment or a configuration capable of achieving the same object. The invention also includes a configuration in which a known technique is added to the configuration described in the embodiment.

DESCRIPTION OF SYMBOLS 1 ... Liquid discharge device, 2 ... Liquid container, 10 ... Control mechanism, 11 ... Main board, 12, 12a, 12b, 12c, 12d ... Connector, 15 ... Print head control circuit, 19, 19a, 19b, 19c, 19d ... Cable, 20 carriage, 21 print head, 30 moving mechanism, 31 carriage motor, 32 endless belt, 40 transport mechanism, 41 transport motor, 42 transport roller, 50 drive signal output circuit, 50a Drive circuit, 60: piezoelectric element, 90: linear encoder, 100: control circuit, 110: power supply circuit, 180: contact portion, 191, 192: short side, 193, 194: long side, 195, 196 ... terminal, 197 ... Wiring, 198 insulator, 200 drive signal selection circuit, 210 temperature detection circuit, 220 selection control circuit, 222 shift Gister 224 Latch circuit 226 Decoder 230 Selection circuit 232 Inverter 234 Transfer gate 240 Diagnostic circuit 241 Integrated circuit 250 Temperature abnormality detection circuit 251 Comparator 252 Reference Voltage generation circuit, 253, transistor, 254, diode, 255, 256, resistor, 310, head, 311, ink ejection surface, 320, substrate, 321,322, surface, 323, 324, 325, 326, side, 330a, 330b, 330c, 330d ... electrode group, 331a, 331b, 331c, 331d ... ink supply path insertion hole, 332a, 332b ... FPC insertion hole, 346, 347, 348, 349 ... fixing portion, 350 ... connector, 351 ... housing, 352: Cable attachment part, 353: Terminal 353a: Board mounting portion, 353b: Housing insertion portion, 353c: Cable holding portion, 360: Connector, 361: Housing, 362: Cable mounting portion, 363: Terminal, 370: Connector, 371: Housing, 372: Cable mounting portion, 373: terminal, 380: connector, 381: housing, 382: cable mounting part, 383: terminal, 600: discharge part, 601: piezoelectric body, 611, 612: electrode, 621: diaphragm, 631: cavity, 632 ... Nozzle plate, 641 reservoir, 651 nozzle, 661 ink supply port, P medium

Claims (39)

A driving element for discharging a liquid from a nozzle by driving based on a driving signal,
A drive signal selection circuit that controls supply of the drive signal to the drive element,
A first terminal;
A second terminal;
A third terminal;
A fourth terminal;
A fifth terminal;
A sixth terminal;
A seventh terminal;
A first diagnostic signal input to the first terminal, a second diagnostic signal input to the second terminal, a third diagnostic signal input to the third terminal, and a fourth diagnostic signal input to the fourth terminal. A diagnostic circuit for diagnosing whether normal ejection of liquid is possible based on the diagnostic signal;
A printhead control circuit for controlling the operation of a printhead having
First diagnostic signal propagation wiring for transmitting the first diagnostic signal;
A second diagnostic signal propagation wiring for transmitting the second diagnostic signal;
A third diagnostic signal propagation wiring for transmitting the third diagnostic signal;
A fourth diagnostic signal propagation wiring for transmitting the fourth diagnostic signal;
A fifth diagnostic signal propagation wiring that is input to the fifth terminal and propagates a fifth diagnostic signal indicating a diagnostic result of the diagnostic circuit;
A first voltage signal transmission line for transmitting a first voltage signal input to the sixth terminal and supplied to the drive signal selection circuit;
A second voltage signal transmission line for transmitting a second voltage signal input to the seventh terminal;
A diagnostic signal output circuit that outputs the first diagnostic signal, the second diagnostic signal, the third diagnostic signal, and the fourth diagnostic signal;
A drive signal output circuit that outputs the drive signal;
With
When the fifth diagnostic signal transmission line and the second voltage signal transmission line are electrically connected to the print head, the fifth diagnosis signal transmission line and the second voltage signal transmission line Electrically connected through five terminals and the seventh terminal,
The first diagnostic signal propagation wiring and the second diagnostic signal propagation wiring are located side by side,
In a direction in which the first diagnostic signal propagation wiring and the second diagnostic signal propagation wiring are arranged, the first diagnostic signal propagation wiring and the second voltage signal propagation wiring are located adjacent to each other;
A print head control circuit characterized by the above. A driving element for discharging a liquid from a nozzle by driving based on a driving signal,
A drive signal selection circuit that controls supply of the drive signal to the drive element,
A first terminal;
A second terminal;
A third terminal;
A fourth terminal;
A fifth terminal;
A sixth terminal;
A seventh terminal;
A first diagnostic signal input to the first terminal, a second diagnostic signal input to the second terminal, a third diagnostic signal input to the third terminal, and a fourth diagnostic signal input to the fourth terminal. A diagnostic circuit for diagnosing whether normal ejection of liquid is possible based on the diagnostic signal;
A printhead control circuit for controlling the operation of the printhead comprising:
First diagnostic signal propagation wiring for transmitting the first diagnostic signal;
A second diagnostic signal propagation wiring for transmitting the second diagnostic signal;
A third diagnostic signal propagation wiring for transmitting the third diagnostic signal;
A fourth diagnostic signal propagation wiring for transmitting the fourth diagnostic signal;
A fifth diagnostic signal propagation wiring that is input to the fifth terminal and propagates a fifth diagnostic signal indicating a diagnostic result of the diagnostic circuit;
A first voltage signal transmission line for transmitting a first voltage signal input to the sixth terminal and supplied to the drive signal selection circuit;
A second voltage signal transmission line for transmitting a second voltage signal input to the seventh terminal;
A diagnostic signal output circuit that outputs the first diagnostic signal, the second diagnostic signal, the third diagnostic signal, and the fourth diagnostic signal;
A drive signal output circuit that outputs the drive signal;
With
When the fifth diagnostic signal transmission line and the second voltage signal transmission line are electrically connected to the print head, the fifth diagnosis signal transmission line and the second voltage signal transmission line Electrically connected through five terminals and the seventh terminal,
The first diagnostic signal propagation wiring and the second diagnostic signal propagation wiring are located side by side,
In the direction intersecting with the direction in which the first diagnostic signal propagation wiring and the second diagnostic signal propagation wiring are arranged, the first diagnostic signal propagation wiring and the second voltage signal propagation wiring partially overlap each other ,
A print head control circuit characterized by the above. The fifth diagnostic signal propagation wiring also serves as a wiring for transmitting a signal indicating the presence or absence of a temperature abnormality of the print head.
The print head control circuit according to claim 1, wherein A first ground signal transmission line for transmitting a ground signal;
The first diagnostic signal transmission line and the first ground signal transmission line are located adjacent to each other in a direction in which the first diagnosis signal transmission line and the second diagnosis signal transmission line are arranged.
The print head control circuit according to claim 1, wherein: A third voltage signal transmission line for transmitting a third voltage signal having a voltage value larger than the first voltage signal;
In the direction in which the first diagnostic signal propagation wiring and the second diagnostic signal propagation wiring are arranged, the second voltage signal propagation wiring and the third voltage signal propagation wiring are not located adjacent to each other.
The printhead control circuit according to claim 1, wherein: A third voltage signal transmission line for transmitting a third voltage signal having a voltage value larger than the first voltage signal;
In the direction orthogonal to the direction in which the first diagnostic signal transmission wiring and the second diagnosis signal transmission wiring are arranged, the second voltage signal transmission wiring and the third voltage signal transmission wiring do not overlap each other,
The printhead control circuit according to claim 1, wherein: A second ground signal transmission line for transmitting a ground signal;
The third voltage signal transmission line and the second ground signal transmission line are located adjacent to each other in a direction in which the first diagnosis signal transmission line and the second diagnosis signal transmission line are arranged.
7. The print head control circuit according to claim 5, wherein A second ground signal transmission line for transmitting a ground signal;
The third voltage signal transmission line and the second ground signal transmission line partially overlap each other in a direction intersecting with a direction in which the first diagnosis signal transmission line and the second diagnosis signal transmission line are arranged. ,
7. The print head control circuit according to claim 5, wherein The print head has a first connector including the first terminal, the second terminal, the third terminal, the fourth terminal, and the fifth terminal, and a substrate,
The first connector and the diagnostic circuit are provided on the same surface of the board,
The first diagnostic signal propagation wiring, the second diagnostic signal propagation wiring, the third diagnostic signal propagation wiring, the fourth diagnostic signal propagation wiring, and the fifth diagnostic signal propagation wiring are provided on the same cable,
The cable is electrically connected to the first connector;
The print head control circuit according to claim 1, wherein The first diagnostic signal propagation wiring also serves as a wiring for transmitting a clock signal;
The print head control circuit according to claim 1, wherein: The second diagnostic signal propagation wiring also serves as a wiring for transmitting a signal that defines a liquid ejection timing.
The printhead control circuit according to claim 1, wherein: The third diagnostic signal propagation wiring also serves as a wiring for transmitting a signal that defines a waveform switching timing of the drive signal.
The printhead control circuit according to claim 1, wherein: The fourth diagnostic signal propagation wiring also serves as a wiring for transmitting a signal that defines a waveform selection of the drive signal.
The print head control circuit according to claim 1, wherein: A driving element for discharging a liquid from a nozzle by driving based on a driving signal,
A drive signal selection circuit that controls supply of the drive signal to the drive element,
A diagnostic circuit for diagnosing whether or not normal ejection of liquid is possible based on the first diagnostic signal, the second diagnostic signal, the third diagnostic signal, and the fourth diagnostic signal;
A first terminal to which the first diagnostic signal is input;
A second terminal to which the second diagnostic signal is input;
A third terminal to which the third diagnostic signal is input;
A fourth terminal to which the fourth diagnostic signal is input;
A fifth terminal to which a fifth diagnostic signal indicating a diagnostic result of the diagnostic circuit is input;
A sixth terminal to which a first voltage signal supplied to the drive signal selection circuit is input;
A seventh terminal to which the second voltage signal is input;
With
The fifth terminal and the seventh terminal are electrically connected,
The first terminal and the second terminal are located side by side,
In the direction in which the first terminal and the second terminal are arranged, the first terminal and the seventh terminal are located adjacent to each other;
A print head, characterized in that: A driving element for discharging a liquid from a nozzle by driving based on a driving signal,
A drive signal selection circuit that controls supply of the drive signal to the drive element,
A diagnostic circuit for diagnosing whether or not normal ejection of liquid is possible based on the first diagnostic signal, the second diagnostic signal, the third diagnostic signal, and the fourth diagnostic signal;
A first terminal to which the first diagnostic signal is input;
A second terminal to which the second diagnostic signal is input;
A third terminal to which the third diagnostic signal is input;
A fourth terminal to which the fourth diagnostic signal is input;
A fifth terminal to which a fifth diagnostic signal indicating a diagnostic result of the diagnostic circuit is input;
A sixth terminal to which a first voltage signal supplied to the drive signal selection circuit is input;
A seventh terminal to which the second voltage signal is input;
With
The fifth terminal and the seventh terminal are electrically connected,
The first terminal and the second terminal are located side by side,
In a direction intersecting with a direction in which the first terminal and the second terminal are arranged, the first terminal and the seventh terminal partially overlap with each other.
A print head, characterized in that: Equipped with a temperature abnormality detection circuit to diagnose the presence or absence of temperature abnormality,
The fifth terminal also serves as a wiring for transmitting a signal indicating the presence or absence of the temperature abnormality.
The print head according to claim 14 or 15, wherein: A first ground terminal to which a ground signal is input;
In the direction in which the first terminal and the second terminal are arranged, the first terminal and the first ground terminal are located adjacent to each other;
The print head according to any one of claims 14 to 16, characterized in that: An eighth terminal to which a third voltage signal having a voltage value larger than the first voltage signal is input;
In a direction in which the first terminal and the second terminal are arranged, the seventh terminal and the eighth terminal are not positioned adjacent to each other;
The print head according to any one of claims 14 to 17, characterized in that: An eighth terminal to which a third voltage signal having a voltage value larger than the first voltage signal is input;
In a direction orthogonal to the direction in which the first terminal and the second terminal are arranged, the seventh terminal and the eighth terminal do not overlap with each other.
The print head according to any one of claims 14 to 17, characterized in that: A second ground terminal to which a ground signal is input;
The eighth terminal and the second ground terminal are located adjacent to each other in a direction in which the first terminal and the second terminal are arranged.
The print head according to claim 18 or 19, wherein: A second ground terminal to which a ground signal is input;
In a direction intersecting with a direction in which the first terminal and the second terminal are arranged, the eighth terminal and the second ground terminal partially overlap with each other.
The print head according to claim 18 or 19, wherein: A first connector including the first terminal, the second terminal, the third terminal, the fourth terminal, and the fifth terminal;
Board and
With
The first connector and the diagnostic circuit are provided on the same surface of the board.
The print head according to any one of claims 14 to 21, wherein: The first terminal also serves as a terminal to which a clock signal is input;
A print head according to any one of claims 14 to 22, characterized in that: The second terminal also serves as a terminal to which a signal defining a liquid ejection timing is input;
The print head according to any one of claims 14 to 23, wherein: The third terminal also serves as a terminal to which a signal that defines a waveform switching timing of the drive signal is input.
The print head according to any one of claims 14 to 24, wherein: The fourth terminal also serves as a terminal to which a signal that defines waveform selection of the drive signal is input.
The print head according to any one of claims 14 to 25, wherein: A print head,
A print head control circuit for controlling the operation of the print head,
With
The print head includes:
A driving element for discharging a liquid from a nozzle by driving based on a driving signal,
A drive signal selection circuit that controls supply of the drive signal to the drive element,
A diagnostic circuit for diagnosing whether or not normal ejection of liquid is possible based on the first diagnostic signal, the second diagnostic signal, the third diagnostic signal, and the fourth diagnostic signal;
A first terminal to which the first diagnostic signal is input;
A second terminal to which the second diagnostic signal is input;
A third terminal to which the third diagnostic signal is input;
A fourth terminal to which the fourth diagnostic signal is input;
A fifth terminal to which a fifth diagnostic signal indicating a diagnostic result of the diagnostic circuit is input;
A sixth terminal to which a first voltage signal supplied to the drive signal selection circuit is input;
A seventh terminal to which the second voltage signal is input;
Has,
The print head control circuit includes:
First diagnostic signal propagation wiring for transmitting the first diagnostic signal;
A second diagnostic signal propagation wiring for transmitting the second diagnostic signal;
A third diagnostic signal propagation wiring for transmitting the third diagnostic signal;
A fourth diagnostic signal propagation wiring for transmitting the fourth diagnostic signal;
A fifth diagnostic signal propagation wiring for transmitting the fifth diagnostic signal;
A first voltage signal transmission line for transmitting the first voltage signal;
A second voltage signal transmission line for transmitting the second voltage signal;
A diagnostic signal output circuit that outputs the first diagnostic signal, the second diagnostic signal, the third diagnostic signal, and the fourth diagnostic signal;
A drive signal output circuit that outputs the drive signal;
Has,
The first diagnostic signal transmission wiring and the first terminal are electrically contacted at a first contact portion;
The second diagnostic signal propagation wiring and the second terminal are electrically contacted at a second contact portion,
The third diagnostic signal transmission wiring and the third terminal are electrically contacted at a third contact portion,
The fourth diagnostic signal transmission wiring and the fourth terminal are electrically contacted at a fourth contact portion,
The fifth diagnostic signal transmission wiring and the fifth terminal are electrically connected at a fifth contact portion,
The first voltage signal transmission wiring and the sixth terminal are electrically contacted at a sixth contact portion,
The second voltage signal transmission wiring and the seventh terminal are electrically contacted at a seventh contact portion,
The fifth diagnostic signal propagation wiring and the second voltage signal propagation wiring are electrically connected via the fifth terminal, the fifth contact portion, the seventh contact portion, and the seventh terminal,
The first contact portion and the second contact portion are located side by side,
In a direction in which the first contact portion and the second contact portion are arranged, the first contact portion and the seventh contact portion are located adjacent to each other,
A liquid discharge device characterized by the above-mentioned. A print head,
A print head control circuit for controlling the operation of the print head,
With
The print head includes:
A driving element for discharging a liquid from a nozzle by driving based on a driving signal,
A drive signal selection circuit that controls supply of the drive signal to the drive element,
A diagnostic circuit for diagnosing whether or not normal ejection of liquid is possible based on the first diagnostic signal, the second diagnostic signal, the third diagnostic signal, and the fourth diagnostic signal;
A first terminal to which the first diagnostic signal is input;
A second terminal to which the second diagnostic signal is input;
A third terminal to which the third diagnostic signal is input;
A fourth terminal to which the fourth diagnostic signal is input;
A fifth terminal to which a fifth diagnostic signal indicating a diagnostic result of the diagnostic circuit is input;
A sixth terminal to which a first voltage signal supplied to the drive signal selection circuit is input;
A seventh terminal to which the second voltage signal is input;
Has,
The print head control circuit includes:
First diagnostic signal propagation wiring for transmitting the first diagnostic signal;
A second diagnostic signal propagation wiring for transmitting the second diagnostic signal;
A third diagnostic signal propagation wiring for transmitting the third diagnostic signal;
A fourth diagnostic signal propagation wiring for transmitting the fourth diagnostic signal;
A fifth diagnostic signal propagation wiring for transmitting the fifth diagnostic signal;
A first voltage signal transmission line for transmitting the first voltage signal;
A second voltage signal transmission line for transmitting the second voltage signal;
A diagnostic signal output circuit that outputs the first diagnostic signal, the second diagnostic signal, the third diagnostic signal, and the fourth diagnostic signal;
A drive signal output circuit that outputs the drive signal;
Has,
The first diagnostic signal transmission wiring and the first terminal are electrically contacted at a first contact portion;
The second diagnostic signal propagation wiring and the second terminal are electrically contacted at a second contact portion,
The third diagnostic signal transmission wiring and the third terminal are electrically contacted at a third contact portion,
The fourth diagnostic signal transmission wiring and the fourth terminal are electrically contacted at a fourth contact portion,
The fifth diagnostic signal transmission wiring and the fifth terminal are electrically connected at a fifth contact portion,
The first voltage signal transmission wiring and the sixth terminal are electrically contacted at a sixth contact portion,
The second voltage signal transmission wiring and the seventh terminal are electrically contacted at a seventh contact portion,
The fifth diagnostic signal propagation wiring and the second voltage signal propagation wiring are electrically connected via the fifth terminal, the fifth contact portion, the seventh contact portion, and the seventh terminal,
In a direction intersecting with a direction in which the first contact portion and the second contact portion are arranged, the first contact portion and the seventh contact portion are partially overlapped with each other,
A liquid discharge device characterized by the above-mentioned. The print head has a temperature abnormality detection circuit for diagnosing the presence or absence of a temperature abnormality,
The fifth diagnostic signal propagation wiring also serves as a wiring for transmitting a signal indicating the presence or absence of the temperature abnormality.
The liquid ejecting apparatus according to claim 27 or 28, wherein: The print head has a first ground terminal to which a ground signal is input,
The printhead control circuit has a first ground signal transmission line for transmitting a ground signal,
The first ground signal transmission line and the first ground terminal are electrically connected at a first ground contact portion,
The first contact portion and the first ground contact portion are located adjacent to each other in a direction in which the first contact portion and the second contact portion are arranged.
The liquid ejecting apparatus according to any one of claims 27 to 29, wherein: The print head has an eighth terminal to which a third voltage signal having a voltage value larger than the first voltage signal is input,
The print head control circuit has a third voltage signal transmission line for transmitting the third voltage signal,
The third voltage signal transmission wiring and the eighth terminal are electrically connected at an eighth contact portion,
In the direction in which the first contact portion and the second contact portion are arranged, the seventh contact portion and the eighth contact portion are not located adjacent to each other,
The liquid ejecting apparatus according to any one of claims 27 to 30, wherein: The print head has an eighth terminal to which a third voltage signal having a voltage value larger than the first voltage signal is input,
The print head control circuit has a third voltage signal transmission line for transmitting the third voltage signal,
The third voltage signal transmission wiring and the eighth terminal are electrically connected at an eighth contact portion,
In a direction orthogonal to the direction in which the first contact portion and the second contact portion are arranged, the seventh contact portion and the eighth contact portion do not overlap each other,
The liquid ejecting apparatus according to any one of claims 27 to 30, wherein: The print head has a second ground terminal to which a ground signal is input,
The print head control circuit has a second ground signal transmission line for transmitting a ground signal,
The second ground signal transmission line and the second ground terminal are electrically connected at a second ground contact portion,
The eighth contact portion and the second ground contact portion are located adjacent to each other in a direction in which the first contact portion and the second contact portion are arranged.
The liquid ejecting apparatus according to claim 31, wherein: The print head has a second ground terminal to which a ground signal is input,
The print head control circuit has a second ground signal transmission line for transmitting a ground signal,
The second ground signal transmission line and the second ground terminal are electrically connected at a second ground contact portion,
In a direction intersecting with a direction in which the first contact portion and the second contact portion are arranged, the eighth contact portion and the second ground contact portion are partially overlapped with each other,
The liquid ejecting apparatus according to claim 31, wherein: The print head includes a first connector having the first terminal, the second terminal, the third terminal, the fourth terminal, and the fifth terminal, and a substrate,
The first connector and the diagnostic circuit are provided on the same surface of the board,
The first diagnostic signal propagation wiring, the second diagnostic signal propagation wiring, the third diagnostic signal propagation wiring, the fourth diagnostic signal propagation wiring, and the fifth diagnostic signal propagation wiring are provided on the same cable,
The cable is electrically connected to the first connector;
35. The liquid ejection device according to claim 27, wherein The first diagnostic signal propagation wiring also serves as a wiring for transmitting a clock signal;
The liquid ejecting apparatus according to any one of claims 27 to 35, wherein: The second diagnostic signal propagation wiring also serves as a wiring for transmitting a signal that defines a liquid ejection timing.
The liquid ejecting apparatus according to any one of claims 27 to 36, wherein: The third diagnostic signal propagation wiring also serves as a wiring for transmitting a signal that defines a waveform switching timing of the drive signal.
The liquid ejecting apparatus according to any one of claims 27 to 37, wherein: The fourth diagnostic signal propagation wiring also serves as a wiring for transmitting a signal that defines a waveform selection of the drive signal.
The liquid ejecting apparatus according to any one of claims 27 to 38, wherein:

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