JP4338202B2 - Liquid discharge head and liquid discharge apparatus including the same - Google Patents

Description

  The present invention relates to a liquid discharge head that discharges liquid such as ink, and a liquid discharge apparatus including the same. In addition, as a liquid ejection device, a general printer that performs recording by ejecting ink, a copying machine, a facsimile having a communication system, or a multifunctional recording device that combines the functions of these devices, etc. The present invention can be applied to an apparatus that draws a figure or a pattern on a medium by discharging a liquid other than ink.

  In recent years, an ink jet recording head, which is a typical product as a liquid discharge head, reads information unique to the head (individual information) such as its own ID (Identity) code and drive characteristics of the ink discharge mechanism, and freely holds the data. It has been proposed to mount a ROM (Read Only Memory) on an inkjet recording substrate. For example, Patent Document 1 discloses mounting an EEPROM (Electrically Erasable Programmable ROM) on an ink jet recording head.

  In addition to this, there is a method in which a heating resistance element that generates energy for ink ejection is formed on a base substrate of an ink jet recording substrate of an ink jet recording head by a plurality of laminated films, and a resistance indicating information unique to the head is formed. Are known. This method is effective when the amount of information is relatively small. The resistance value formed on the base substrate is read by the ink jet recording apparatus equipped with the ink jet recording head to obtain unique information of the ink jet recording head, and is optimal for discharging from the ink jet recording apparatus side to the ink jet recording head. Drive control is possible.

  Patent Document 2 discloses that a fuse serving as a ROM is simultaneously formed when forming a laminated film constituting an ink discharge portion on a base substrate for manufacturing an inkjet recording substrate. If this fuse is selectively blown by the control of the logic circuit formed at the same time, binary data can be written and held depending on whether or not the fuse is blown.

  In the ink jet head using the ink jet recording substrate as described above, the structure can be simplified, the productivity can be improved, the cost can be reduced, and the size and weight can be reduced while retaining the information unique to the head.

In the case of an ink jet recording head capable of storing individual information as described above, it is necessary to take measures against static electricity. In particular, in an ink jet recording head that is detachable from the ink jet recording apparatus main body, the user's hand is always touched when the ink jet recording head is attached to the apparatus main body. For example, in the head / ink tank integrated type, a new ink jet recording head is mounted every time the ink tank is empty, and the head touches the user's hand. In addition, when different types of ink jet recording heads are used, the ink jet recording head is touched by the user each time when the ink jet recording apparatus is used as a normal image quality recording device and a photographic image quality high quality recording device. Become. When performing such an operation, it is necessary to protect the ink jet recording head from static electricity. As a proposal for that purpose, Patent Document 3 discloses that a discharge circuit is provided around a contact pad for electrical connection with an ink jet recording apparatus main body.
Japanese Patent Laid-Open No. 3-126560 JP-A-6-91877 Japanese Patent Application Laid-Open No. 07-060953

    However, the conventional inkjet recording head capable of storing the individual information described above has the following problems.

  In an ink jet recording head equipped with a storage element such as a ROM or EEPROM as described in Patent Document 1 and Patent Document 2 described above, the apparatus configuration is inevitably complicated, so that improvement in productivity and reduction in size and weight can be achieved. Various improvements for the purpose are desired. Basically, the ROM chip is useful when the recording data has a large capacity, but if the recording data is not a large capacity, it may be disadvantageous in terms of cost, and there is still room for improvement in this respect. ing.

  In addition, since the above-described static electricity is not taken into consideration, it is necessary to take countermeasures. In the case where a memory element for storing information unique to the head is finely provided on the head substrate, the terminal for outputting the information unique to the head is relatively weak against static electricity, and the head touches the user's hand during mounting. If this happens, there is a fear that it will be destroyed or the information content will be rewritten. For this reason, countermeasures against static electricity are important.

  In the ink jet recording head described in Patent Document 3, the influence of static electricity is avoided, but a discharge circuit must be separately provided on the substrate. For this reason, various improvements for improving space efficiency, miniaturization and cost reduction are desired.

  An object of the present invention is to solve the above-described problems, and to provide a liquid discharge head that has a simple configuration and is hardly affected by static electricity, and a liquid discharge apparatus including the liquid discharge head.

  Another object of the present invention is to make it easier for a discharge during handling of a liquid discharge head to occur on a power contact pad or a ground contact pad than on an individual information output contact pad. An object of the present invention is to provide a liquid discharge head having a structure in which a problem such as rewriting hardly occurs and a liquid discharge apparatus including the liquid discharge head.

In order to achieve the above object, a liquid discharge head according to an aspect of the present invention is a liquid discharge head that discharges liquid, and includes a plurality of columns each including a plurality of contact pads , and a memory for storing individual information. A plurality of contact pads, each of which includes an element and a liquid discharge member that includes a discharge port for discharging a liquid and discharges the liquid using electric power supplied through a part of the plurality of contact pads. includes a first contact pad is an individual information contact pad the stored element electrically connected, and a second contact pad is a power supply contact pads or ground contact pads for supplying the electric power, and the The first contact pad is provided in an inner row of the plurality of rows, and the first contact pad is connected to the first contact pad. Characterized in that provided between two of said second contact pad in contact.
A liquid discharge head according to another aspect of the present invention is a liquid discharge head that discharges a liquid, and includes a plurality of columns each including a plurality of contact pads, a storage element for storing individual information, and a liquid A liquid discharge member that discharges liquid using electric power supplied through a part of the plurality of contact pads, wherein the plurality of contact pads store the memory A first contact pad that is an individual information contact pad electrically connected to the device, and a second contact pad that is a power contact pad or a ground contact pad for supplying the power, the first contact pad Is provided in an inner row of the plurality of rows, and adjacent to the periphery of the first contact pad, three or more of the second contacts are provided. Pad is provided, in a region surrounded by the three or more second contact pad, wherein the first contact pad is provided.

  According to the present invention as described above, it is possible to destroy or rewrite individual information of a storage element due to static electricity when the head is mounted with a simple configuration without providing a special circuit and without increasing the size of the head. The problem can be solved.

  Next, embodiments of the present invention will be described with reference to the drawings.

  5 to 12 are explanatory diagrams for explaining an ink jet recording head or an ink jet recording apparatus as an embodiment of the liquid ejecting head or the liquid ejecting apparatus according to the present invention. Hereinafter, each component will be described with reference to these drawings.

  The recording head of this embodiment is of an ink tank integrated type, as shown in FIGS. 5A and 5B, the first recording head H1000 filled with black ink, and FIG. As shown in (a) and (b), there are two forms of the second recording head H1001 filled with color ink (cyan ink, magenta ink, yellow ink). These recording heads H1000 and H1001 are fixedly supported on the carriage 102 mounted on the ink jet recording apparatus main body by positioning means and electrical contacts, and are detachable from the carriage 102. When the filled ink is not consumed, the recording head can be replaced.

  Hereinafter, the configuration of the recording heads H1000 and H1001 will be described in detail.

<Recording head>
Each of the first recording head H1000 and the second recording head H1001 is an ink jet recording head using an electrothermal transducer that generates thermal energy for causing film boiling to the ink in accordance with an electric signal. An ink jet recording head having a structure in which an electrothermal transducer as a recording element and an ink discharge port are arranged to face each other. In this embodiment, these recording heads are recording element substrates that discharge ink (an embodiment of a liquid discharge member that includes a discharge port for discharging liquid and discharges liquid using supplied power). The ink tank that holds and stores the ink to be supplied to the recording element substrate has been described as having an integrated structure, but the ink tank has a structure having only the recording element substrate as a separate body. It may be a recording head.

(1) First recording head H1000
FIG. 6 is an exploded perspective view of the first recording head H1000. The first recording head H1000 includes a first recording element substrate H1100, an electric wiring sheet H1300 as an electric wiring member, and an ink storage member H1500.

  FIG. 7 is a perspective view illustrating a configuration of the first recording element substrate H1100, with a part thereof broken away. For example, the first recording element substrate H1100 is obtained by forming an ink supply port H1102 having a long groove-like through-hole as an ink flow path on a Si substrate H1110 having a thickness of 0.5 mm to 1 mm. The first recording element substrate H1100 is adhesively fixed to the ink storage member H1500 with high positional accuracy so that the ink supply port 1102 of the first recording element substrate H1100 communicates with the ink supply port H1200 of the ink storage member H1500. The

  On the Si substrate H1110, the electrothermal conversion elements H1103 are arranged side by side on both sides of the ink supply port H1102, and an electric wiring (not shown) made of Al or the like for supplying electric power to the electrothermal conversion elements H1103. Is formed.

  The Si substrate H1110 has electrode portions H1104 for supplying electric power to the electric wiring and supplying an electric signal for driving the electrothermal conversion element H1103, at both ends of the row of the electrothermal conversion elements H1103. The bumps H1105 made of Au or the like are formed on the respective electrode portions H1104.

  Further, the Si substrate H1110 is formed with fuses for storing information unique to the head and necessary peripheral circuits. The outline is shown in FIG.

  In FIG. 11, the portion indicated by H1117 is a fuse. In this example, four fuses H1117 made of polysilicon resistors are disposed on the short side of the ink supply port H1102. Each fuse H1117 is connected to a second drive element H1118 for melting the fuse and reading information. These second drive elements H1118 are disposed adjacent to the first drive element H1116 that drives the electrothermal transducer H1103.

  As a signal for selecting the second drive element H1118 for driving the fuse H1117, a signal for selecting the first drive element H1116 for driving the electrothermal transducer H1103 is used as it is. Therefore, a circuit portion for selecting the second drive element H1118 can be formed with the same configuration as the circuit portion for selecting the first drive element H1116. Specifically, the portion from the signal line to which a signal is input from the outside of the inkjet recording substrate to the signal line connected to the second driving element H1118 through the shift register, the latch circuit, and the decoder is the first drive. A circuit configuration common to a circuit for selecting the element H1116 can be employed. A selection circuit H1112 that finally selects the second drive element H1118 by an output from a shift register or the like has a structure similar to that of the selection circuit for the first drive element H1116.

  A VH pad H1104c for supplying VH power is connected to the electrothermal conversion element H1103 via a VH wiring H1114. A GNDH pad H1104d for supplying a GNDH power supply is common to the first driving element H1116 connected to the electrothermal conversion element H1103 and the second driving element H1118 connected to the fuse H1117 via the GNDH wiring H1113. It is connected. That is, the first drive element H1116 and the second drive element H1118 share the GNDH wiring H1113.

  The ID pad H1104a functions as a fuse cutting power supply terminal for applying a voltage when the fuse H1117 is blown, and as a signal output terminal when reading information by the fuse. Specifically, when the fuse H1117 is blown, a voltage (for example, 24V of the drive voltage of the electrothermal conversion element) is applied to the ID pad H1104a to drive the second drive element H1118 selected by the selection circuit. The corresponding fuse H1117 is blown instantaneously. At this time, electrical continuity with an external circuit such as a fuse reading power supply connected to the ID power supply pad H1104b which is a fuse reading power supply terminal is cut off. On the other hand, when reading information, a voltage (for example, 3.3 V of the power supply voltage of the logic circuit) is applied to the ID power supply pad H1104b. Are at the same potential, and a high level voltage is output from the ID pad H1104a. When the fuse H1117 is not blown, a voltage at the Lo level is output from the ID pad H1104a by the read resistor H1111 having a resistance value much larger than the resistance value of the fuse H1117.

  As another form, a simple wiring may be formed on the Si substrate H1110 instead of the above-described fuse H1117, and information may be stored and read based on the presence or absence of the wiring. In this case, information specific to the head is written when a wiring is formed on the Si substrate H1110. Information can be read in exactly the same manner as described above, but information cannot be written later.

  As a further different form, a resistance element related to information unique to the head may be formed on the Si substrate H1110, and one end of the resistance element may be connected to the ID pad H1104a and the other end to the GNDH pad H1104d. . In this case, the ink jet recording apparatus main body can obtain head-specific information corresponding to the resistance value by reading the resistance value between the ID pad H1104a and the GNDH pad H1104d.

  In any of the above forms, an ink flow path is provided for each electrothermal conversion element H1103 on the surface on which a memory element pattern such as a fuse, wiring, and resistance element is formed on the Si substrate H1110. Is formed by photolithography. This structure has an ink flow path wall H1106 that divides each ink flow path and a ceiling portion that covers the ink flow path wall H1106, and a discharge port H1107 is opened in the ceiling portion. The discharge port 1107 is provided so as to face each of the electrothermal conversion elements H1103, thereby forming a discharge port group H1108.

  In the first recording element H1100 configured as described above, the ink supplied from the ink flow path H1102 is opposed to each electrothermal conversion element H1103 by the pressure of bubbles generated by the heat generated by each electrothermal conversion element H1103. From the discharge port 1107 to be discharged.

  The electric wiring sheet H1300 forms an electric signal path for applying an electric signal for ejecting ink to the first recording element substrate H1100, and a copper foil wiring pattern is formed on a polyimide base substrate. It is configured by forming. Further, an opening H1303 for incorporating the first recording element substrate H1100 is formed, and an electrode terminal H1304 connected to the electrode portion H1104 of the first recording element substrate H1100 is formed near the edge of the opening. Is formed. Furthermore, an external signal input terminal H1302 for receiving an electrical signal from the main unit is formed on the electrical wiring sheet H1300, and the external signal input terminal H1302 and the electrode terminal H1304 are connected by a continuous copper foil wiring pattern. ing.

  The electrical connection between the electrical wiring sheet H1300 and the first recording element substrate H1100 is, for example, the bump H1105 formed on the electrode portion H1104 of the first recording element substrate H1100 and the electrode portion H1104 of the first recording element substrate H1100. The electrode terminal H1304 of the electrical wiring sheet H1300 corresponding to is electrically joined by a thermal ultrasonic pressure bonding method.

On the plane around the first recording element substrate H1100 fixed to the ink storage member H1500 (the surface facing the recording medium when the recording head H1000 is mounted on the carriage 102), an electric wiring sheet is provided. A part of the back surface of H1300 is bonded and fixed with an adhesive. The unbonded portion of the electric wiring sheet H1300 is bent and fixed to the side surface of the ink storage member H1500 that is substantially perpendicular to the bonding surface of the first recording element substrate H1100 with an adhesive or the like.

(2) Second recording head H1001
The second recording head H1001 is for discharging inks of three colors, cyan, magenta, and yellow. As shown in the exploded perspective view of FIG. 9, the second recording element substrate H1101 and an electric circuit as an electric wiring member are used. The wiring sheet H1301 and the ink storage member H1501 are included. Except for the configuration described below, the configuration is basically the same as that of the first recording head H1000 described above.

  FIG. 10 is a partially broken perspective view for explaining the configuration of the second recording element substrate H1101. The second recording element substrate H1101 is greatly different from the first recording element substrate H1100 in that three ink supply ports H1102 for cyan, magenta, and yellow are formed in parallel. On both sides of each ink supply port H1102, electrothermal conversion elements H1103 and discharge ports H1107 are arranged in a staggered pattern in a line. Similar to the Si substrate H1110 in the first recording element substrate H1100, electrical wiring, fuses or resistors, electrode portions, and the like are formed on the Si substrate H1110a. Further, an ink flow path wall H1106 and a discharge port H1107 made of a resin material are formed on the Si substrate H1110a by photolithography. A bump H1105 made of Au or the like is formed on the electrode portion H1104 for supplying electric power to the electric wiring.

<Inkjet recording apparatus>
Next, a recording apparatus capable of mounting the above-described recording head will be described. FIG. 12 is an example of a recording apparatus on which the ink jet recording head of the present invention can be mounted, and is a schematic top view that outlines the inside.

  As can be seen with reference to FIG. 12, this recording apparatus has a carriage 102 on which the recording head H1000 shown in FIG. 5 and the recording head H1001 shown in FIG. The carriage 102 is provided with an electrical connection unit for transmitting a drive signal and the like to each ejection unit via external signal input terminals on the recording heads H1000 and H1001.

  As shown in FIGS. 5 and 8, the first recording head H1000 and the second recording head H1001 are provided with a mounting guide H1560 for guiding the recording head to the head mounting position of the carriage 102, and the ink jet recording head H1000. The carriage 102 is guided and fixed to a predetermined position by an engaging portion H1930 for fixing to the ink jet recording apparatus. The ink jet recording head H1000 includes an abutting portion H1570 in the X direction (carriage scan direction) for positioning at a predetermined mounting position of the carriage 102, an abutting portion H1580 in the Y direction (recording medium conveyance direction), and a Z direction (ink ejection Direction) abutting portion H1590. By being positioned with respect to the carriage 102 by these abutting portions, accurate electrical contact between the external signal input terminals H1302 on the electrical wiring sheets H1300 and H1301 and the contact pins of the electrical connection portions provided in the carriage 102 is achieved. Is possible.

  The carriage 102 extends in the main scanning direction and is supported so as to be reciprocally movable along a guide shaft 103 installed in the apparatus main body. The recording heads H1000 and H1001 are mounted on the carriage 102 so that the arrangement direction of the ejection ports in each ejection unit intersects the scanning direction of the carriage 102. Recording is performed by ejecting liquid from the ejection port array on the recording medium 108 conveyed to the opposite position.

  It is also possible to use as a high-quality photographic tone printer by replacing the recording head H1000 with a recording head having the same configuration as the recording head H1001 and having the internal ink composed of light magenta, light cyan, and black. It is.

<ESD (electrostatic discharge) test results>
An ESD experiment was conducted using the second recording element substrate H1101 provided with the circuit shown in FIG. The results are shown below.

  In the electrical wiring sheet H1301 on which the experiment was performed, ID contact pads H1302a, VH contact pads H1302c, and GNDH contact pads H1302d are provided at positions as shown in FIG. That is, the VH contact pad H1302c is disposed on one side of the ID contact pad H1302a, and the GNDH contact pad H1302d is disposed on the other side. Each contact pad has an opening size of 1.3 mm square and a pitch of 2.0 mm. The base material of the electric wiring sheet H1301 is made of polyimide, and a plurality of wirings made of copper foil are connected to the ID pad H1104a, VH pad H1104c, and GNDH contact pad H1104d on the second recording element substrate, respectively.

  In FIG. 13, a hemispherical test terminal 140 having a diameter of 8 mm is brought close to the ID contact pad H1302a, and the discharge state of each contact pad when a voltage of +20 kV is applied to the test terminal 140 was observed. The results of this observation for four samples 1 to 4 are shown in Table 1 below.

  According to the above results, only one of the four samples caused the discharge to the ID contact pad H1302a even though the discharge was aimed at the ID contact pad H1302a. From this result, it can be seen that the discharge to the ID contact pad is more effectively prevented by the presence of the VH contact pad and the GNDH contact pad in the vicinity of the ID contact pad. In addition, in the case of Sample 1 in which the discharge to the ID contact pad occurred, the discharge to the VH contact pad also occurred at the same time, so that the VH contact pad and the GNDH contact pad are present in the vicinity of the ID contact pad. It can be seen that the discharge to the ID contact pad is alleviated.

  In the above description, the case where the storage element is provided in the recording element substrate has been described. However, naturally, the same effect can be recognized when the same storage element is provided on a substrate different from the recording element substrate. .

  As described above, in the recording head according to the present embodiment, by providing one or both of the VH contact pad and the GNDH contact pad adjacent to both sides of the ID contact pad, the discharge to the ID contact pad is more effectively performed. It is designed to be prevented or alleviated. This prevents an adverse effect on the storage element due to static electricity generated when the head touches the user's hand when mounted on the apparatus main body or carriage. In particular, recently, the circuit of the ink jet recording substrate has been improved, and it has become quite strong against static electricity. Therefore, it is sufficient to take measures against static electricity only by applying the contact pad arrangement in this embodiment. It is believed that there is.

  The arrangement relationship between the ID contact pad, the VH contact pad, and the GNDH contact pad will be described below with a specific example.

  An ink jet recording head according to a first embodiment of the present invention will be described with reference to FIG.

  FIG. 1 is an enlarged view of an external signal input terminal portion of an electric wiring sheet of a second recording head used in the ink jet recording head of this embodiment. Referring to FIG. 1, it can be seen that the electric wiring sheet H1301 is provided with 32 external signal input terminals H1302. Among these external signal input terminals H1302, the number of ID contact pads H1302a is six, and the position thereof is substantially the center of the portion where the external signal input terminal H1302 is provided. These ID contact pads H1302a and fuses H1117 (or simple connection or resistance elements, see FIG. 11) present at both ends of each of the three ink supply ports H1102 of the second recording element substrate H1101 shown in FIG. Each is connected to a connected ID pad.

  Six VH contact pads H1302c are arranged along one row of ID contact pads H1302a (adjacent to the upper side of the row of ID contact pads H1302a in FIG. 1). These VH contact pads H1302c are connected to VH pads H1104c (see FIG. 11) present on electrode portions H1104 (see FIG. 10) on both ends of the second recording element substrate H1101.

  Six GNDH contact pads H1302d are arranged along the row of ID contact pads H1302a on the other side (the side located below the row of ID contact pads H1302a in FIG. 1). These GNDH contact pads H1302d are connected to the GNDH pads H1104 (see FIG. 11) present on the electrode portions H1104 (see FIG. 10) on both ends of the second recording element substrate H1101.

  The remaining external signal input terminals H1302 except for the ID contact pad H1302a, the VH contact pad H1302c, and the GNDH contact pad H1302d are used for other signal exchanges such as power supply to the transistors and control signals.

  In the case of the ink jet recording head of the present embodiment, the ID contact pad H1302a that is relatively weak against static electricity is located at the substantially central portion of the external signal input terminal H1302. This arrangement is a position where it is difficult to touch the ID contact pad H1302a when the user holds the second recording head. Basically, the user has the recording head consciously not to touch the external signal input terminal H1302, so the pad located at the center is harder to touch.

  In addition, since the ID contact pad H1302a is adjacent to the VH contact pad H1302c and the GNDH contact pad H1302d and is sandwiched between the contact pads, the charged finger of the user approaches the ID contact pad H1302a. If a discharge occurs, the discharge is likely to occur in the VH contact pad H1302c and the GNDH contact pad H1302d. In this way, the structure is less likely to cause problems such as destruction or rewriting of head-specific information due to discharge.

  An ink jet recording head according to a second embodiment of the present invention will be described with reference to FIG.

  FIG. 2 is an enlarged view of the external signal input terminal portion of the electrical wiring sheet of the first recording head used in the ink jet recording head of this embodiment. Referring to FIG. 2, it can be seen that the electric wiring sheet H1300 is provided with 21 external signal input terminals H1302. Since the first recording head is for black ink, compared with the second recording head for cyan, magenta, and yellow inks described in the first embodiment, the power supply terminal and control signal are used. The terminal is running low. However, the carriage 102 of the main body of the ink jet recording apparatus can be mounted with a photo recording head serving as a third recording head having the same form as the second recording head at a position from which the first recording head is removed. For this reason, the positions of the 21 external signal input terminals H1302 correspond to the positions when the external signal input terminals H1302 are mounted on the carriage 102 in the second recording head.

  Of the external signal input terminals H1302 provided on the electrical wiring sheet H1300, the number of ID contact pads H1302a is two, and the position thereof is substantially the center of the portion where the external signal input terminal H1302 is provided. These ID contact pads H1302a are ID pads connected to fuses H1117 (or simple connection or resistance elements, see FIG. 11) present at both ends of the ink supply port H1102 of the first recording element substrate H1100 shown in FIG. Are connected to each.

  Four VH contact pads H1302c are arranged along one side of the ID contact pads H1302a (adjacent one side of the ID contact pads H1302a in FIG. 2). These VH contact pads H1302c are connected to VH pads H1104c (see FIG. 11) present on electrode portions H1104 (see FIG. 7) at both ends of the first recording element substrate H1100.

  Four GNDH contact pads H1302d are arranged along the arrangement of the ID contact pads H1302a on the other side (the lower side of the ID contact pads H1302a in FIG. 2). These GNDH contact pads H1302d are connected to GNDH pads H1104 (see FIG. 11) present on the electrode portions H1104 (see FIG. 7) at both ends of the recording element substrate H1100.

  The remaining external signal input terminals H1302 except for the ID contact pad H1302a, the VH contact pad H1302c, and the GNDH contact pad H1302d are used for other signal exchanges such as power supply to the transistors and control signals.

  Also in the ink jet recording head of this embodiment, as in the case of the first embodiment, the ID contact pad H1302a, which is relatively weak against static electricity, is located almost at the center of the external signal input terminal H1302 portion. When the person holds the first recording head, it is difficult to touch the ID contact pad H1302a.

  In addition, since the ID contact pad H1302a is adjacent to the VH contact pad H1302c and the GNDH contact pad H1302d and is sandwiched between the contact pads, the charged finger of the user approaches the ID contact pad H1302a. Thus, when a discharge occurs, the structure is less likely to cause problems such as destruction or rewriting of head-specific information due to the discharge.

  An ink jet recording head according to a third embodiment of the present invention will be described with reference to FIG.

  FIG. 3 is an enlarged view of the external signal input terminal portion of the electric wiring sheet of the second recording head used in the ink jet recording head of this embodiment. This second recording head uses the same second recording element substrate H1101 as that of the first embodiment, and only the arrangement of the external input terminals H1302 on the electric wiring sheet is the same as that of the first embodiment. Is different.

  Of the 32 external signal input terminals H1302 provided on the electrical wiring sheet H1301, six are ID contact pads H1302a. These ID contact pads H1302a are arranged in the vertical direction (the length direction of the electrical wiring sheet H1301) in the center of the portion where the external signal input terminal H1302 is formed.

  Six VH contact pads H1302c are arranged adjacent to one side (the right side of the arrangement of ID contact pads H1302a in FIG. 3) along the ID contact pads H1302a, and the other side (FIG. In FIG. 3, six GNDH contact pads H1302d are arranged adjacent to the ID contact pad H1302a.

  Also in the ink jet recording head of this embodiment, as in the case of the first embodiment, the ID contact pad H1302a, which is relatively weak against static electricity, is located almost at the center of the external signal input terminal H1302 portion. When the person holds the second recording head, it is difficult to touch the ID contact pad H1302a.

  In addition, since the ID contact pad H1302a is adjacent to the VH contact pad H1302c and the GNDH contact pad H1302d and is sandwiched between the contact pads, the charged finger of the user approaches the ID contact pad H1302a. Thus, when a discharge occurs, the structure is less likely to cause problems such as destruction or rewriting of head-specific information due to the discharge.

  An ink jet recording head according to a fourth embodiment of the present invention will be described with reference to FIG.

  FIG. 4 is an enlarged view of the external signal input terminal portion of the electric wiring sheet of the second recording head used in the ink jet recording head of this embodiment. This second recording head uses the same second recording element substrate H1101 as that of the first embodiment, and only the arrangement of the external input terminal H1302 on the electric wiring sheet H1301 is that of the first embodiment. And different.

  Of the 32 external signal input terminals H1302 provided on the electrical wiring sheet H1301, six are ID contact pads H1302a. Each of these ID contact pads H1302a is substantially at the center of the portion where the external signal input terminal H1302 is provided. A VH contact pad H1302c or a GNDH contact pad H1302d is provided adjacent to the periphery (upper, lower, left and right of the ID contact pad H1302a in FIG. 4). That is, each ID contact pad H1302a is sandwiched between the VH contact pad H1302c or the GNDH contact pad H1302d in the vertical and horizontal directions in FIG. In other words, three ID contact pads H1302a are diagonally arranged in two rows at the center of the portion where the external signal input terminal H1302 is provided, and six VH contact pads sandwich each row. Three oblique rows formed by H1302c and six GNDH contact pads H1302d are formed.

  In the ink jet recording head of this embodiment, each ID contact pad H1302a is sandwiched between VH contact pad H1302c or GNDH contact pad H1302d provided adjacent to the upper, lower, left, and right positions on the four sides of the ID contact pad H1302a. The structure is less likely to cause problems such as destruction or rewriting of head-specific information due to electric discharge than in the other embodiments.

  The ink jet recording heads of the embodiments described above are examples of the present invention, and the configuration thereof can be changed as appropriate without departing from the spirit of the invention.

  In addition, the ink jet recording head used in the description of each embodiment described above is not limited to the ink jet recording method described in this embodiment, and can be applied to ink jet recording heads employing various ink discharging methods. is there.

  Further, the present invention can be applied even if the external signal input terminal used in the description of the above-described embodiments is a pad having a shape in which adjacent pads of the same type are connected to each other. The ID contact pad can be used not only for reading information but also as a pad for writing information when the memory element mounted on the recording head is an element capable of writing information.

1 is a schematic diagram showing a wiring board of an ink jet recording head that is a first embodiment of the present invention. FIG. It is a schematic diagram showing a wiring board of an ink jet recording head that is a second embodiment of the present invention. It is a schematic diagram which shows the wiring board of the inkjet recording head which is the 3rd Example of this invention. It is a schematic diagram which shows the wiring board of the inkjet recording head which is the 4th Example of this invention. It is a perspective view for demonstrating the 1st inkjet recording head using the wiring board of the inkjet recording head shown in FIG. FIG. 6 is an exploded perspective view of the ink jet recording head shown in FIG. 5. FIG. 6 is a perspective view showing a part of a first recording element substrate constituting the ink jet recording head shown in FIG. It is a perspective view for demonstrating the 2nd inkjet recording head using the wiring board of the inkjet recording head shown in FIG. It is a disassembled perspective view of the inkjet recording head shown in FIG. It is a perspective view which fractures | ruptures and shows a part of 2nd recording element board | substrate which comprises the inkjet recording head shown in FIG. FIG. 2 is a schematic diagram of a Si substrate including a fuse for storing information unique to the head and necessary peripheral circuits used in the ink jet recording head for carrying out the present invention. FIG. 2 is a schematic top view showing an internal view of an example of a recording apparatus on which an ink jet recording head embodying the present invention can be mounted. It is a schematic diagram for demonstrating ESD experiment.

Explanation of symbols

H1301 Electric wiring sheet H1302a ID contact pad H1302c VH contact pad H1302d GNDH contact pad

Claims (15)

A liquid discharge head for discharging liquid,
A plurality of rows composed of a plurality of contact pads;
A storage element for storing individual information;
A liquid discharge member that includes a discharge port for discharging liquid, and discharges liquid using electric power supplied through a part of the plurality of contact pads;
Wherein the plurality of contact pads includes a first contact pad wherein a memory element and electrically connected to the individual information contact pad, a second contact pad is a power supply contact pads or ground contact pads for supplying the electric power includes, the first contact pad is provided on the inner row of the plurality of rows,
The liquid discharge head according to claim 1, wherein the first contact pad is provided between the two second contact pads adjacent to the first contact pad . A liquid discharge head for discharging liquid,
A plurality of rows composed of a plurality of contact pads;
A storage element for storing individual information;
A liquid discharge member that includes a discharge port for discharging liquid, and discharges liquid using electric power supplied through a part of the plurality of contact pads;
The plurality of contact pads include a first contact pad that is an individual information contact pad electrically connected to the storage element, and a second contact pad that is a power contact pad or a ground contact pad for supplying power. The first contact pad is provided in an inner row of the plurality of rows,
Three or more second contact pads are provided adjacent to the periphery of the first contact pad, and the first contact pads are provided in a region surrounded by the three or more second contact pads. A liquid discharge head. The plurality of rows includes a first contact pad row including a plurality of the first contact pads , and a plurality of second contact pad rows including a plurality of the second contact pads,
3. The liquid ejection head according to claim 1, wherein the second contact pad row is provided on each side of the first contact pad row. 4. The plurality of rows includes two or more first contact pad rows, and the second contact pad row having one or more rows more than the number of the first contact pad rows. Item 4. The liquid ejection head according to Item 3 . 5. The liquid ejection head according to claim 3, wherein the first contact pad row includes only the first contact pads. The liquid ejection head according to claim 3, wherein the second contact pad row includes only the second contact pad. The first contact pad is sandwiched between the second contact pads in two directions: a first pad array direction and a second pad array direction intersecting the first pad array direction. liquid discharge head according to any one of claims 1 to 6 are. Said storage element, a liquid discharge head according to any one of claims 1 to 7 is provided in the liquid ejection member. The liquid ejection head according to claim 8 , wherein the storage element is configured to hold information depending on presence / absence of a connection provided in the liquid ejection member. The liquid ejection head according to claim 9 , wherein the storage element is configured by a fuse that can be cut by an electric signal from the outside. The liquid discharge head according to claim 10, wherein the first contact pad is a contact pad to which a voltage for cutting the fuse can be applied, and a contact pad from which a signal output from the fuse can be read. The liquid discharge head includes an electrothermal conversion element that generates energy for discharging liquid, a first drive element that drives the electrothermal conversion element, a second drive element that drives the fuse, A circuit for selecting the first drive element, and a circuit for selecting the second drive element,
The liquid discharge head according to claim 11, wherein a circuit for selecting the first drive element and a circuit for selecting the second drive element have a common circuit configuration. The liquid ejection head according to claim 8 , wherein the storage element is configured by a resistance element. The liquid discharge head, liquid discharge head according to any one of claims 1 to 13, further comprising an ink tank for storing the liquid. A liquid discharge head according to any one of claims 1 to 14 ,
A carriage mounted with the liquid discharge head and reciprocally movable in a certain direction;
Said carriage, a liquid ejection apparatus having a plurality of pads is brought into contact with a plurality of contact pads formed on the liquid ejection head.

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