Inspection apparatus, recording apparatus and inspection method for recording head
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-03-16
- Publication Date
- 2026-03-24
AI Technical Summary
Existing recording head technologies struggle to accurately control the temperature of recording element substrates due to variations in temperature sensor output values, making it difficult to maintain consistent temperature adjustments.
A print head inspection device that estimates the temperature of print element substrates using inlet and outlet temperature sensors, coupled with a liquid circulation system and temperature adjustment mechanism, to accurately determine and control the temperature distribution across multiple recording element substrates.
Enables precise temperature control of recording heads, ensuring stable printing performance by accounting for individual temperature sensor characteristics and fluctuations, thereby improving ejection consistency.
Smart Images
Figure 00000000_0000_ABST
Abstract
Description
[Technical field]
[0001] The present disclosure relates to an inspection device for a recording head that ejects liquid droplets from ejection ports and causes them to land on a recording medium, a recording device for the recording head, and an inspection method for the recording head. [Background technology]
[0002] In recent years, in liquid ejection devices used for business purposes such as business, commercial, and industrial purposes, a line head is used that is equipped with recording elements for ejecting liquid in accordance with the width of the recording medium. As an example of liquid supply to the recording element substrate of the line head, liquid can be supplied to all the recording element substrates from the end of the recording element on one side. In addition, liquid that has not been ejected is discharged from the discharge port arranged at the opposite end. There are also other types in which liquid is supplied from a supply part in the center to discharge parts at both ends, and there are also, although not limited to, types in which liquid is supplied to multiple recording element substrates from liquid supply parts that are fewer in number than the number of recording element substrates.
[0003] The supply and discharge of liquid is performed by circulating the liquid inside the print head using a pump outside the print head, a sub-tank for generating negative pressure inside the print head, etc. In such a line head, each print element board is equipped with a temperature sensor that can check the temperature of the print element board itself.
[0004] As a method for controlling the temperature inside the print head, for example, Patent Document 1 discloses a means for measuring the temperatures of the inflowing ink and the outflowing ink and controlling the ink temperature with a temperature adjustment mechanism on the circulation path. [Prior art documents] [Patent documents]
[0005] [Patent Document 1] JP 2011-83928 A Summary of the Invention [Problem to be solved by the invention]
[0006] However, in the above invention, although the ink temperature can be controlled by heating the ink, the temperature of the recording element substrate cannot be controlled. Also, although it is assumed that a temperature sensor is provided on the recording element substrate to measure the temperature of the recording element substrate, there is a risk that the output value of the temperature sensor will vary, and there is a risk that the temperature of the recording element substrate cannot be detected properly.
[0007] In view of the above problems, the present disclosure aims to provide a print head inspection device, a printing device for the print head, and an inspection method for the print head that estimate the temperature of the print element substrate, confirm information from the print head's temperature sensor, and enable control in accordance with the temperature sensor value. [Means for solving the problem]
[0008] The inspection device disclosed herein is a printhead having a plurality of printing element substrates, the printing element substrates having a temperature sensor that outputs a temperature as a voltage value and a plurality of ejection ports for ejecting liquid, the plurality of printing element substrates being fluidly connected via liquid chambers, the printing head having an inlet for introducing ink into the printing head and an outlet for ejecting the ink to the outside, the printing head being arranged so that the ink circulates through the printing element substrates and the inside of the liquid chambers, an ink tank, an ink circulation system that circulates the ink between the printing head and the ink tank, an inlet temperature sensor that measures the ink temperature from the ink tank to the inlet, and an outlet temperature sensor that measures the temperature of ink discharged from the outlet, and the temperature distribution of the printing head is estimated from the measured values of the inlet temperature sensor and the outlet temperature sensor. Effect of the Invention
[0009] According to the above configuration, it is possible to provide a printhead inspection device, a printing device for the printhead, and an inspection method for the printhead, which estimate the temperature of the print element substrate, check the information from the printhead temperature sensor, and enable control in accordance with the temperature sensor value. [Brief description of the drawings]
[0010] [Figure 1] 1A is a perspective view of a recording head, (b) is a perspective view of a recording head, (c) is an enlarged view of an outlet of the recording head, (d) is an enlarged view of an inlet of the recording head, and (e) is a perspective view of a recording head for printing on a non-recording medium. [Diagram 2] 1A is a schematic diagram of the inspection device according to the first embodiment, FIG. 1B is an enlarged view of an ink inlet section of the inspection device, and FIG. 1C is an enlarged view of an ink outlet section of the inspection device. [Diagram 3] 10 is a graph showing the estimated temperatures of each recording element substrate. [Figure 4] FIG. 11 is a schematic diagram of an inspection device according to a second embodiment. [Diagram 5] The liquid thermometer value and the temperature sensor output voltage value are shown when the ink temperature is set to 20 degrees and 42 degrees. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0011] Hereinafter, an example of an embodiment of the present disclosure will be described with reference to the drawings. However, the following description does not limit the scope of the present disclosure. As an example, the present embodiment employs a thermal method of discharging liquid by generating bubbles using a heating element, but the present disclosure can also be applied to liquid discharge heads employing a piezo method or various other liquid discharge methods.
[0012] This embodiment is an inspection device for a print head in a form in which a liquid such as ink is circulated between an ink tank and a print head, but other forms are also acceptable as long as the liquid flows from the inlet side to the outlet side inside the print head. Also, this embodiment describes the movement of liquid from an inlet at one end of the print head to an outlet at the opposite end, but a form in which there is an inlet at the center of the print head and the liquid flows to outlets at both ends is also acceptable.
[0013] In addition, in this embodiment, the so-called line type head has a length corresponding to the width of the recording medium, but the present disclosure can also be applied to a so-called serial type liquid ejection head that performs printing while scanning the recording medium. An example of a serial type liquid ejection head is a configuration in which one recording element substrate for black ink and one for color ink are mounted. In addition, the present disclosure is not limited to this, and a short line head shorter than the width of the recording medium may be created by arranging several recording element substrates so that the ejection ports overlap in the ejection port row direction, and the form in which the short line head is scanned over the recording medium may be used. In that case, the present disclosure is applicable to a case in which liquid is supplied to multiple recording element substrates from the same inlet.
[0014] <First embodiment> (Recording head and circulation mechanism) The configuration of the recording head 3 according to the first embodiment will be described. FIG. 1(a) is a perspective view of the recording head 3 according to this embodiment as viewed from a diagonally downward direction, and FIG. 1(b) is a perspective view of the recording head 3 as viewed from a diagonally upward direction. The recording head 3 has an electric board 40, and is driven by receiving an electric signal or power from the main body at a signal input terminal 91 or a power supply terminal 92. The electric board 40 is fixed to the protective member 30 with screws and joined to the housing. The electric board 40 is joined to the recording element board 10 by a flexible wiring board 41. As a result, the recording element board 10 receives an electric signal or power from the main body and drives the ejection of ink, etc. The recording head 3 has a plurality of recording element boards 10 having ink ejection units. In this embodiment, the recording head has 17 recording element boards 10, and recording is possible for the width of the recording medium. Therefore, in this embodiment, the recording head 3 does not move, but the recording medium moves under the recording head 3 as shown in FIG. 1(e) to complete the recording. The recording medium may be, for example, paper, cloth, resin film, etc. In this embodiment, one recording element substrate 10 has approximately 8192 ejection ports, each of which ejects approximately 2 pl of ink.
[0015] In this embodiment, the recording head 3 has a mechanism for circulating ink within the head. FIG. 1(c) is an enlarged view of the vicinity of the inlet 60 of the recording head 3, and FIG. 1(d) is an enlarged view of the vicinity of the outlet 61 of the recording head 3. The ink that enters from the inlet 60 on the inlet side goes to the subtank 80, passes through the inside of the base plate 55, and fills each ejection port of the recording element substrate 10, and ink that is not used for ejection is finally ejected from the outlet 61. In the subtank 80, a high negative pressure portion and a low negative pressure portion are separated by chambers, and ink enters the inside of the base plate 55 while maintaining the pressure difference. The inside of the base plate 55 has a two-chamber structure (liquid chamber) through which ink flows, and is divided into a chamber through which high pressure ink flows and a chamber through which low pressure ink flows. In addition, the base plate 55 is in contact with the recording element substrate 10, and holes that are fluidically connected to the ink ejection unit of the recording element substrate 10 are open from both the chamber through which high pressure ink flows and the chamber through which low pressure ink flows. This allows the ink to circulate inside the recording element substrate 10. Ink that is introduced into the recording element substrate 10 from the chamber where high pressure ink flows and exits from the recording element substrate 10 into the chamber where low pressure ink flows passes through the base plate 55 to the discharge side and is discharged from the discharge port 61. The above is the configuration of the recording head 3 and the configuration of the circulation inside the recording head.
[0016] (Configuration of recording head inspection device) Next, we will explain the device for inspecting this recording head 3. To inspect this recording head 3, it is necessary to input electric signals and power to the electric board 40 from the signal input terminal 91 and the power supply terminal 92. A control board is also required to control the drive signal and voltage and perform the desired inspection. The inspection here refers to determining the drive voltage, the ejection amount, the ejection conditions from the nozzles, etc.
[0017] In addition, the inspection device is provided with a means for pressurizing and introducing ink from an ink inlet 60 and a means for reducing pressure and sucking ink from an ink outlet 61 in order to circulate ink inside the recording head 3.
[0018] FIG. 2(a) is a schematic diagram of the inspection device of the first embodiment. The control board 76 controls the electric signals and power of the print head, and also controls the pressure pump and the liquid thermometer. In the figure of this embodiment, only one control board is shown, but in reality, there are often multiple boards with different roles, and there is no particular limitation. First, as shown in FIG. 2(b), the inlet 60 and the tube of the inlet path 64 of the inspection device are connected to the inlet member 62, and as shown in FIG. 2(c), the outlet 61 and the tube of the outlet path 65 of the inspection device are connected to the outlet member 63. The recording element substrate side of the print head is covered and sealed with the cap 70, and the inlet path 64 and the outlet path 65 are closed with an electromagnetic valve or the like. The closing means may be an electromagnetic valve or a hand-made cock, and is not particularly limited as long as it can block the path. After closing the inlet path 64 and the outlet path 65, suction is performed from the cap side, and the inside of the print head 3 is reduced in pressure close to a vacuum. In this reduced pressure state, the inlet path 64 is opened, and ink is filled into the print head 3 all at once. Once a certain amount of ink has been filled, the cap 70 is opened. After the recording head 3 is filled with ink, the discharge path 65 is also opened and the supply pressure pump 73 is operated to pressurize the ink in the supply tank 72 and push the ink through the inlet 60. Here, the supply pressure pump 73 is operated at this timing, but it may also be operated when filling, and there is no particular limitation as long as filling is possible. At the same time, the discharge pressure pump 77 is also operated to reduce the pressure in the discharge tank 75, thereby starting circulation within the recording head 3.
[0019] Next, the contents of the test will be explained. The contents of the test are to obtain conditions such as thresholds for ejection, such as at what voltage value the ink is ejected and at what pulse width the ink is ejected. However, in recent years, the viscosity of ink has increased, making it difficult to eject ink, and in order to suppress changes in the amount of ink ejected during ejection, it has become more common to use inkjet heads while keeping the ink warm. This print head is also assumed to be used while keeping the ink warm. Basically, the means for keeping the ink warm can be anything, such as installing a sub-heater on the print element board 10 or providing a means for warming the ink itself to be introduced and introducing it outside the print head. During this keeping the ink warm, each print element board 10 has a temperature sensor to measure the temperature. However, temperature sensors made of diodes and the like often have different characteristics for each print element board. For example, the voltage value output at the same temperature and the slope of the voltage rise due to temperature change tend to have individual characteristics and are different. In addition, since the power supply for the amplifier circuit attached to the electric board 40 is received from the control board 76, there is a possibility that the correct voltage is not being input due to the influence of other signal lines, etc. In this amplifier circuit, if the power supply deviates by even 0.1V, the offset value changes, so the output value changes significantly, but it is difficult to measure the voltage entering the circuit each time. It is also difficult to make the output voltage, including the inspection device, always output the same voltage at the entrance of the print head. In this state, if a command is transferred to raise the temperature of the memory element board 10 including the ink to 40°C, the output values of the diodes will be uniform, but the actual temperature of the print element board 10 may not be correctly aligned. In addition, since the temperature sensor on the print element board 10 is configured to pass a current through the circuit and amplify the voltage value output by the amplifier circuit on the electric board, it is difficult to take a complete countermeasure.
[0020] Therefore, in the embodiment of the present disclosure, a liquid thermometer 71 is inserted near the inlet 60 of the inlet path 64 and the outlet 61 of the outlet path 65. This allows the temperature of the ink being introduced and the temperature of the ink being discharged to be measured in real time, and the output value of each temperature sensor of the recording element substrate 10 can be known. Unlike the temperature sensor of the recording element substrate 10, this liquid thermometer 71 uses the power supply of the main body only as the power supply for the thermometer, so that the temperature of the ink can be measured with high accuracy with almost no fluctuation in the power supply due to the influence of other signal lines. This configuration is particularly important in a recording head in which multiple recording element substrates 10 are arranged. However, although the output value can be known, when the power is actually turned on and data is input to obtain the temperature, the temperature of the recording element substrate 10 itself, the flowing ink, and the surrounding components also rise due to heat generation from the circuit inside the recording element substrate 10.
[0021] When the ink temperature is lower than room temperature, the discharge side tends to be warmer than the inlet side, and when the ink temperature is higher than room temperature or the temperature rise due to the energy consumption of the circuit, the temperature tends to drop due to heat dissipation. FIG. 3 shows a graph of the temperature of each recording element substrate 10 (Dev0 to Dev16) estimated based on the value of the liquid thermometer 71 when the ink is circulated and the power supply of the recording head 3 is turned on. The inlet side is designated as A, and the outlet side is designated as B. The black dots are the values measured by the liquid thermometer 71. The liquid thermometer 71 is located close to the inlet 60 and outlet 61 in terms of distance and is not affected by the external environment. The dotted line represents room temperature. As shown in FIG. 3, when room temperature > ink temperature, the temperature is higher near the outlet 61 (B) (see FIG. 3(a)), and when room temperature < ink temperature, the temperature is lower near the outlet 61 (B) (see FIG. 3(b)). When the temperature is higher than room temperature, the power consumption of the power supply also has an effect, but the trend of this temperature difference does not change.
[0022] Second Embodiment The basic configuration is the same as in the first embodiment, but in the second embodiment, an ink temperature adjustment mechanism is provided in the inspection device so that the temperature of the ink can be changed before it passes from the ink tank 74 through the supply pressure pump 73 and enters the print head. In the schematic diagram of Fig. 4, a heat exchanger 78 and chiller 79 are installed on the introduction side. The temperature of the ink introduced is made variable by the chiller. After the ink is set to a constant temperature and the temperature sensor value of each print element board is obtained, the set temperature is changed and the temperature sensor value is obtained again.
[0023] FIG. 5 shows the liquid thermometer value and the output voltage value of the temperature sensor when the ink temperature is set to 20 degrees and 42 degrees. When the liquid thermometer is set to 21 degrees, which is lower than room temperature, it can be seen that the temperature tends to rise slightly due to the power consumption at the time of measurement and the room temperature. When it is set to 42 degrees, which is higher than room temperature, the temperature gradually drops due to heat dissipation. The estimated temperature of each recording element board is recorded in the temperature difference column, and the temperature sensor slope (how many mV changes per 1°C) is obtained from the difference in the output value of the temperature sensor. The obtained temperature sensor slope is written to a storage device such as a volatile memory by referring to a slope rank table (Table 1) held by the inspection device. In this way, the inspection device can estimate how to control the temperature sensor of each recording element board 10 to adjust it to the desired temperature. The storage device stores information on the calculated calibration value, and holds information on the temperature sensor calibration value. The storage device may be provided in the print head. Also, the temperature sensor calibration value information may be held in a data holding unit of the inspection device. The temperature can be controlled by a heating resistor built into the recording element substrate 10, or by driving a heater with a short pulse that does not cause ejection, and the means is not limited.
[0024] [Table 1]
[0025] By referring to the data storage unit or memory device values in which the results described above and the calibration value information obtained therefrom are written, the voltage value of the temperature sensor when the target temperature is reached can be determined.
[0026] <Third embodiment> The third embodiment is a recording device that uses a recording head that has the same configuration as the inspection device of the second embodiment and can perform the same control. As with the inspection device, the temperature of the recording head can be accurately controlled, and target temperature control corresponding to the rank of each temperature sensor can be performed, ensuring printing stability.
[0027] <<Other embodiments>> The present disclosure includes configurations typified by the following recording apparatus example and recording apparatus control method example.
[0028] <Configuration 1> A print head having a plurality of print element substrates, The recording element substrate has a temperature sensor that outputs a temperature as a voltage value and a plurality of ejection ports that eject liquid, the plurality of recording element substrates are in fluid communication with each other via liquid chambers; The recording head has an inlet for introducing ink into the recording head and an outlet for discharging the ink to the outside, and is arranged so that the ink circulates through the recording element substrate and the liquid chamber. A recording head; Ink tank and an ink circulation system that circulates the ink between the recording head and the ink tank; an introduction temperature sensor for measuring an ink temperature between the ink tank and the introduction port; a discharge temperature sensor for measuring a temperature of the ink discharged from the discharge port; A temperature distribution of the print head is estimated from the measured values of the inlet temperature sensor and the outlet temperature sensor. A recording head inspection device.
[0029] <Configuration 2> 2. The printhead inspection apparatus according to configuration 1, further comprising: a calibration value for each temperature sensor of the print element substrate being obtained from a temperature distribution of the printhead.
[0030] <Configuration 3> The recording head inspection apparatus according to configuration 2, characterized in that the recording head has a memory device capable of storing information on the calculated calibration value, and information on the calibration value of the temperature sensor is held in the memory device.
[0031] <Configuration 4> 4. The printhead inspection device according to configuration 3, wherein the information on the calibration value of the temperature sensor is written in accordance with a temperature sensor rank table held by the inspection device.
[0032] <Component 5> 5. The recording head inspection device according to any one of configurations 1 to 4, further comprising a temperature adjustment mechanism for adjusting the temperature of the ink to be supplied, in a part of the ink circulation system.
[0033] <Component 6> The recording head inspection device according to configuration 5, characterized in that the temperature adjustment mechanism changes the ink temperature in two stages and circulates it, obtains values from the inlet temperature sensor, the outlet temperature sensor, and the temperature sensor of the recording element substrate, calculates the absolute value and slope (mV / °C) of the temperature sensor of the memory head, and obtains information on the calibration value of the temperature sensor.
[0034] <Component 7> 7. The inspection device according to configuration 6, wherein the inclination of the temperature sensor is written in a volatile memory of the printhead in accordance with a temperature sensor inclination rank table held by the inspection device.
[0035] <Component 8> The recording head inspection device according to any one of configurations 1 to 7, wherein the recording element substrates are arranged in a row and the ink flows sequentially.
[0036] <Component 9> 9. The recording head inspection device according to any one of configurations 1 to 8, wherein the recording head is a line type head.
[0037] <Component 10> A recording device having a recording head, The recording head has a plurality of recording element substrates, the recording element substrate has a temperature sensor that outputs a temperature as a voltage value and a plurality of ejection ports that eject liquid; the plurality of recording element substrates are in fluid communication with each other via liquid chambers, and each substrate has an inlet port for introducing ink thereinto and an outlet port for discharging the ink therefrom to the outside; The ink is arranged to circulate through the recording element substrate and the liquid chamber. A recording head; Ink tank and an ink circulation system that circulates the ink between the recording head and the ink tank; an introduction temperature sensor for measuring an ink temperature between the ink tank and the introduction port; a discharge temperature sensor for measuring a temperature of the ink discharged from the discharge port; a temperature distribution of the print head is estimated from the measurements of the inlet temperature sensor and the outlet temperature sensor.
[0038] <Component 11> 11. The printing apparatus according to configuration 10, further comprising: a calibration value for each temperature sensor of the printing element substrate being obtained from a temperature distribution of the print head.
[0039] <Component 12> 12. The recording apparatus according to claim 11, wherein the recording head has a memory device capable of storing information on the calculated calibration value, and the information on the calibration value of the temperature sensor is held in the memory device.
[0040] <Component 13> 13. The recording device according to configuration 12, wherein the information on the calibration value of the temperature sensor is written in accordance with a temperature sensor rank table held by the recording device.
[0041] <Component 14> 11. The recording apparatus according to claim 10, further comprising a temperature adjustment mechanism for adjusting a temperature of the ink to be supplied, in a part of the ink circulation system.
[0042] <Component 15> The recording apparatus according to configuration 14, characterized in that the temperature adjustment mechanism changes the ink temperature in two stages and circulates it, obtains values from the inlet temperature sensor, the outlet temperature sensor, and the temperature sensor of the recording element substrate, calculates the absolute value and slope (mV / °C) of the temperature sensor of the memory head, and obtains information on the calibration value of the temperature sensor.
[0043] <Component 16> 16. The recording apparatus according to configuration 15, wherein the temperature sensor inclination is written to the storage device of the recording head in accordance with a temperature sensor inclination rank table held by the recording apparatus.
[0044] <Component 17> 17. The recording device according to configuration 16, characterized in that the output voltage value of the temperature sensor at the target temperature is determined by referring to the storage device in which the calibration information of the temperature sensor and the inclination of the temperature sensor are written.
[0045] <Component 18> 16. The recording device according to configuration 15, wherein the inclination of the temperature sensor is written to a data storage unit of the recording device in accordance with a temperature sensor inclination rank table held by the recording device.
[0046] <Component 19> 19. The recording device according to configuration 18, wherein the output voltage value of the temperature sensor at the target temperature is determined by referring to the data storage unit in which the calibration information of the temperature sensor and the inclination of the temperature sensor are written.
[0047] <Component 20> 20. The recording apparatus according to any one of configurations 10 to 19, wherein the recording element substrates are arranged in a row and the ink flows sequentially.
[0048] <Component 21> 21. The recording apparatus according to any one of configurations 10 to 20, wherein the recording head is a line type head.
[0049] <Component 22> A print head having a plurality of print element substrates, the recording element substrate has a temperature sensor that outputs a temperature as a voltage value and a plurality of ejection ports that eject liquid; the plurality of recording element substrates are in fluid communication with each other via liquid chambers; The recording head has an inlet for introducing ink into the recording head and an outlet for discharging the ink to the outside, The ink is arranged to circulate through the recording element substrate and the liquid chamber. A recording head; Ink tank and an ink circulation system that circulates the ink between the recording head and the ink tank; an introduction temperature sensor for measuring an ink temperature between the ink tank and the introduction port; a discharge temperature sensor for measuring the ink temperature between the ink tank and the discharge port; A method for inspecting a print head, comprising estimating a temperature distribution of the print head from measurements of the inlet temperature sensor and the outlet temperature sensor.
[0050] <Component 23> 23. The method for inspecting a printhead according to claim 22, further comprising obtaining a calibration value for each temperature sensor of the print element substrate from the temperature distribution of the printhead. [Explanation of symbols]
[0051] 3 Recording head 10 Recording element board 60 Introduction 61 Outlet 62 Introduction parts 63 Discharge parts 64 Access 65 Exhaust route 71 Liquid Thermometer
Claims
1. A recording head having multiple recording element substrates, The recording element substrate has a temperature sensor that outputs temperature as a voltage value and a plurality of outlets for discharging liquid. The plurality of recording element substrates are in fluid communication via liquid chambers, The recording head has an inlet for introducing ink inside and an outlet for discharging the ink to the outside, and the ink is arranged to circulate within the recording element substrate and the liquid chamber. Recording head and Ink tank and An ink circulation system that circulates the ink between the recording head and the ink tank, An inlet temperature sensor for measuring the ink temperature between the ink tank and the inlet, It has a discharge temperature sensor that measures the temperature of the ink discharged from the discharge port, The temperature distribution of the recording head is estimated from the measured values of the input temperature sensor and the output temperature sensor. A distinctive feature is the inspection device for recording heads.
2. The recording head inspection apparatus according to claim 1, wherein calibration values of each temperature sensor on the recording element substrate are obtained from the temperature distribution of the recording head.
3. The recording head inspection apparatus according to claim 2, wherein the recording head has a storage device capable of storing information on the calculated calibration value of the temperature sensor, and the storage device holds the information on the calibration value of the temperature sensor.
4. The inspection device for a recording head according to claim 3, characterized in that the calibration value information of the temperature sensor is written according to a temperature sensor rank table possessed by the inspection device.
5. The inspection device for a recording head according to claim 1, characterized in that a temperature control mechanism for adjusting the temperature of the supplied ink is included in a part of the ink circulation system.
6. The recording head inspection apparatus according to claim 5, characterized in that the temperature is changed in two stages and circulated by the temperature adjustment mechanism, the values of the introduction temperature sensor, the discharge temperature sensor, and the temperature sensor of the recording element substrate are acquired, the absolute value and slope (mV / °C) of the temperature sensor of the memory head are calculated, and information on the calibration value of the temperature sensor is obtained.
7. The inspection apparatus according to claim 6, characterized in that the tilt of the temperature sensor is written to the volatile memory of the recording head according to the temperature sensor tilt rank table of the inspection apparatus.
8. The recording head inspection apparatus according to claim 1, wherein the recording element substrates are arranged in a sequential order and the ink flows sequentially.
9. The recording head inspection device according to claim 1, wherein the recording head is a line-type head.
10. A recording device having a recording head, The recording head has a plurality of recording element substrates, The recording element substrate has a temperature sensor that outputs temperature as a voltage value and a plurality of outlets for discharging liquid. The plurality of recording element substrates are in fluid communication via liquid chambers, and each substrate has an inlet for introducing ink and an outlet for discharging the ink to the outside. The ink is arranged to circulate within the recording element substrate and the liquid chamber. Recording head and Ink tank and An ink circulation system that circulates the ink between the recording head and the ink tank, An inlet temperature sensor for measuring the ink temperature between the ink tank and the inlet, It has a discharge temperature sensor that measures the temperature of the ink discharged from the discharge port, A recording device characterized by estimating the temperature distribution of the recording head from the measured values of the input temperature sensor and the output temperature sensor.
11. The recording apparatus according to claim 10, wherein calibration values of each temperature sensor on the recording element substrate are obtained from the temperature distribution of the recording head.
12. The recording device according to claim 11, wherein the recording head has a storage device capable of storing information on the calculated calibration value of the temperature sensor, and the storage device holds the information on the calibration value of the temperature sensor.
13. The recording device according to claim 12, characterized in that the calibration value information of the temperature sensor is written according to a temperature sensor rank table held by the recording device.
14. The recording device according to claim 10, characterized in that a part of the ink circulation system has a temperature control mechanism for adjusting the temperature of the supplied ink.
15. The recording apparatus according to claim 14, characterized in that the temperature of the ink is changed in two stages and circulated by the temperature adjustment mechanism, the values of the introduction temperature sensor, the discharge temperature sensor, and the temperature sensor of the recording element substrate are acquired, the absolute value and slope (mV / °C) of the temperature sensor of the memory head are calculated, and information on the calibration value of the temperature sensor is obtained.
16. The recording device according to claim 15, characterized in that the tilt of the temperature sensor is written to the storage device of the recording head according to the rank table of temperature sensor tilts that the recording device has.
17. The recording device according to claim 16, characterized in that it determines the output voltage value of the temperature sensor at a target temperature by referring to the calibration information of the temperature sensor and the storage device on which the tilt of the temperature sensor is written.
18. The recording device according to claim 15, characterized in that the tilt of the temperature sensor is written to the data holding section of the recording device according to the temperature sensor tilt rank table of the recording device.
19. The recording device according to claim 18, characterized in that it determines the output voltage value of the temperature sensor at a target temperature by referring to the calibration information of the temperature sensor and the data holding unit on which the tilt of the temperature sensor is written.
20. The recording device according to claim 10, wherein the recording element substrates are arranged in a sequential order and the ink flows sequentially.
21. The recording device according to claim 10, wherein the recording head is a line-type head.
22. A recording head having multiple recording element substrates, The recording element substrate has a temperature sensor that outputs temperature as a voltage value and a plurality of discharge ports for discharging liquid. The plurality of recording element substrates are in fluid communication via liquid chambers, The recording head has an inlet for introducing ink into the inside and an outlet for discharging the ink to the outside, The ink is arranged to circulate within the recording element substrate and the liquid chamber. Recording head and Ink tank and An ink circulation system that circulates the ink between the recording head and the ink tank, An inlet temperature sensor for measuring the ink temperature between the ink tank and the inlet, It has an ink discharge temperature sensor that measures the ink temperature between the ink tank and the discharge port, A method for inspecting a recording head, which estimates the temperature distribution of the recording head from the measured values of the input temperature sensor and the output temperature sensor.
23. The method for inspecting a recording head according to claim 22, wherein calibration values for each temperature sensor on the recording element substrate are obtained from the temperature distribution of the recording head.