JP4412697B2 - Ink jet recording head and recording apparatus using the ink jet recording head - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present inventionInkjetRecording head and the recording headInkjetThe present invention relates to a recording apparatus using a recording head.
[0002]
The present invention is applied to a general printing apparatus, an apparatus such as a copying machine, a facsimile having a communication system, a word processor having a printing unit, and an industrial recording apparatus combined with various processing apparatuses. can do.
[0003]
[Prior art]
In a recording apparatus according to a conventional ink jet method using thermal energy, an electrothermal transducer (heater) of a recording head to be mounted and its driving circuit are, for example, a semiconductor as disclosed in Japanese Patent Laid-Open No. 5-185594. They are formed on the same substrate using process technology. It has also been proposed to form an element on the same substrate for detecting the state of the substrate, for example, the distribution state of the substrate temperature and the resistance value, the characteristic variation of the drive circuit, and the like.
[0004]
As an example of forming a circuit block for detecting a substrate temperature on the same substrate, Japanese Patent Application Laid-Open No. 2001-080060 proposes a recording head in which a circuit for outputting temperature information as a digital signal is provided on an element substrate. Yes. In such a circuit configuration on the element substrate, a digital circuit such as an inverter and a shift register and an analog circuit such as a comparator are mixed.
[0005]
In general, components used in such an analog circuit are designed to be used with a power supply voltage of 5 V in order to fully exhibit the characteristics. On the other hand, an inverter, a shift register, and the like are digital circuits, and are basically operated by Hi / Lo pulses. Also, the recording information inherent to the recording head and the applied pulses for driving the heater are also digital signals, and all signal exchange with the outside is performed by Hi / Lo logic pulses.
[0006]
Conventionally, the amplitude of the logic pulse used in these and the external signal generation circuit is generally 0V / 5V. As a result, both the analog circuit and the digital circuit are supplied with a single 5V power supply. And was possible.
[0007]
[Problems to be solved by the invention]
In recent years, MPUs (microprocessors) and gate arrays manufactured by a semiconductor process have been further miniaturized, and the power supply voltage to be used tends to be reduced accordingly. In recent years, a digital circuit used in a signal generation device outside a recording head has been generally used with a power supply voltage of 3.3V.
[0008]
As a result, the demand for setting the power supply voltage to a low voltage such as 3.3 V is also increasing for the semiconductor substrate for the recording head. The digital circuit portion can be driven at a low voltage by miniaturizing a transistor constituting the circuit, but it is difficult to reduce the driving voltage for the analog circuit portion with the circuit configuration as it is. In order to reduce the driving voltage of the analog circuit, not only redesign of the circuit is required, but also a special part needs to be used so as not to deteriorate the characteristics.
[0009]
For this reason, when the power supply voltage of the digital circuit is 3.3 V, it is necessary to use different power supply voltages such as 3.3 V for the digital circuit and 5 V for the analog circuit, The semiconductor substrate of the recording head must be designed to supply two types of power from outside. This not only causes an increase in cost, but also complicates the system configuration and becomes a negative factor from the viewpoint of space saving and energy saving (power consumption).
[0010]
  The present invention has been made in view of the above situation, and an analog circuit excluding a voltage for driving a digital circuit and a power supply voltage applied to a recording element (an analog circuit for obtaining information such as temperature). When the voltage for driving the digital circuit is different, it is possible to supply only the voltage for driving the digital circuit from the outside to simplify the overall configuration.InkjetRecording head and the recording headInkjetAn object is to provide a recording apparatus using a recording head.
[0011]
  In order to achieve the above object, an ink jet recording head of the present invention comprises a heater for generating thermal energy to be applied to ink in order to eject ink using thermal energy,
  A driver circuit for driving the heater according to recording data input from the outside, a shift register for holding the recording data, a decoder circuit for selecting and driving the heater, and the shift register and decoder A digital circuit including an input circuit for inputting a digital signal to the circuit;
  An analog circuit including sensing means for obtaining information;
  Comprising an element substrate formed with
  The element substrate is
  A voltage generation circuit for generating a voltage for driving the analog circuit from a heater driving power supply voltage input from the outside and supplied to the heater
  Further comprising
  The voltage for driving the analog circuit generated by the voltage generation circuit is a power supply voltage input from the outside of the element substrate to drive the digital circuit.Greater thanIt is characterized by that.
[0012]
  The object of the present invention isInkjetThis can also be achieved by a recording apparatus provided with a recording head.
[0013]
That is, in the present invention, an element substrate on which a recording circuit and a digital circuit including a driving unit that drives the recording element in accordance with input recording data and an analog circuit including a detection unit for acquiring information are formed. Generation circuit for generating a voltage for driving an analog circuit when a voltage value for driving a digital circuit is different from a voltage value for driving an analog circuit Is provided on the element substrate.
[0014]
In this case, the power supply voltage applied to the recording element is excluded as compared with the case where both the voltage for driving the digital circuit from the outside and the voltage for driving the analog circuit for acquiring information are supplied. Since only the voltage for driving the digital circuit from the outside needs to be supplied, the configuration is simplified without increasing the price of the entire system, and the configuration is advantageous in terms of space saving and energy saving (power consumption). it can.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment according to a recording apparatus of the present invention will be described with reference to the drawings.
[0016]
In the embodiments described below, a printer is taken as an example of a recording apparatus using an inkjet recording method.
[0017]
In this specification, “print” (sometimes referred to as “recording”) is not only used to form significant information such as characters and figures, but also whether it is significant or unintentional, and is perceived visually by humans. Regardless of whether or not it has been manifested, it also refers to a case where an image, a pattern, a pattern, or the like is widely formed on a print medium or the medium is processed.
[0018]
Here, the “print medium” includes not only paper used in general printing apparatuses but also a wide range of cloth, plastic film, metal plate, glass, ceramics, wood, leather, and the like that can accept ink. Say it.
[0019]
Furthermore, “ink” (sometimes referred to as “liquid”) is to be interpreted widely as the definition of “print” above, and is applied to a print medium so that images, patterns, patterns, etc. Or a liquid that can be subjected to ink processing (eg, solidification or insolubilization of colorant in ink applied to the print medium).
[0020]
[Device main unit]
1 and 2 show a schematic configuration of a printer using the ink jet recording method. In FIG. 1, an apparatus main body M1000 that forms an outer shell of a printer in this embodiment includes an outer member of a lower case M1001, an upper case M1002, an access cover M1003, and a discharge tray M1004, and a chassis M3019 ( (See FIG. 2).
[0021]
The chassis M3019 is composed of a plurality of plate-shaped metal members having a predetermined rigidity, forms a skeleton of the recording apparatus, and holds each recording operation mechanism described later.
The lower case M1001 forms a substantially lower half part of the apparatus main body M1000, and the upper case M1002 forms a substantially upper half part of the apparatus upper body M1000. A hollow body structure having a storage space is formed, and an opening is formed on each of the upper surface portion and the front surface portion.
[0022]
Further, one end of the discharge tray M1004 is rotatably held by the lower case M1001, and the opening formed in the front portion of the lower case M1001 can be opened and closed by the rotation. For this reason, when executing the recording operation, the discharge tray M1004 is rotated to the front side to open the opening so that the recording sheets can be discharged and the discharged recording sheets P are sequentially stacked. It has come to be able to do. In addition, the discharge tray M1004 contains two auxiliary trays M1004a and M1004b. By pulling out each tray as needed, the sheet support area can be expanded or reduced in three stages. It has become.
[0023]
One end of the access cover M1003 is rotatably held by the upper case M1002, and can open and close an opening formed on the upper surface. By opening the access cover M1003, the access cover M1003 is housed inside the main body. It is possible to replace the print head cartridge H1000 or the ink tank H1900. Although not specifically shown here, when the access cover M1003 is opened and closed, the protrusion formed on the back surface rotates the cover opening and closing lever, and the rotation position of the lever is detected by a micro switch or the like. Thus, the open / closed state of the access cover can be detected.
[0024]
On the upper surface of the rear part of the upper case M1002, a power key E0018 and a resume key E0019 are provided so that they can be pressed, and an LED E0020 is provided. When the power key E0018 is pressed, the LED E0020 lights up and recording is possible. This is to inform the operator. Further, the LED E0020 has various display functions such as blinking and color change, and notification of a printer trouble to the operator by leveling the buzzer E0021 (FIG. 7). When the trouble is solved, the recording is resumed by pressing the resume key E0019.
[0025]
[Recording mechanism]
Next, the recording operation mechanism in the present embodiment that is housed and held in the printer main body M1000 will be described.
[0026]
As a recording operation mechanism in the present embodiment, an automatic feeding unit M3022 that automatically feeds the recording sheet P into the apparatus main body, and a desired recording sheet P that is sent one by one from the automatic feeding unit. A transport unit M3029 that guides the recording sheet P from the recording position to the discharge unit M3030, a recording unit that performs desired recording on the recording sheet P transported to the transport unit M3029, and recovery of the recording unit And a recovery unit (M5000) that performs processing.
[0027]
(Recording part)
Here, the recording unit will be described.
[0028]
The carriage M4001 is movably supported by the carriage shaft M4021, and the recording head cartridge H1000 is detachably mounted on the carriage M4001.
[0029]
Recording head cartridge
First, the recording head cartridge will be described with reference to FIGS.
[0030]
As shown in FIG. 3, the recording head cartridge H1000 in this embodiment has an ink tank H1900 that stores ink, and a recording head H1001 that discharges ink supplied from the ink tank H1900 from nozzles according to recording information. The recording head H1001 adopts a so-called cartridge system that is detachably mounted on a carriage M4001 described later.
[0031]
In the recording head cartridge H1000 shown here, for example, black, light cyan, light magenta, cyan, magenta, and yellow independent ink tanks are prepared as ink tanks in order to enable high-quality color recording with photographic tone. As shown in FIG. 4, each is detachable from the recording head H1001.
[0032]
As shown in the exploded perspective view of FIG. 5, the recording head H1001 includes a recording element substrate H1100, a first plate H1200, an electric wiring substrate H1300, a second plate H1400, a tank holder H1500, and a flow path forming member H1600. , Filter H1700, and seal rubber H1800.
[0033]
In the recording element substrate H1100, a plurality of recording elements for ejecting ink to one side of the Si substrate and electric wiring such as Al for supplying power to each recording element are formed by a film forming technique. A plurality of corresponding ink channels and a plurality of ejection ports H1100T are formed by photolithography, and ink supply ports for supplying ink to the plurality of ink channels are formed to open on the back surface. . The recording element substrate H1100 is bonded and fixed to a first plate H1200, and an ink supply port H1201 for supplying ink to the recording element substrate H1100 is formed therein. Further, a second plate H1400 having an opening is bonded and fixed to the first plate H1200, and the electric wiring board H1300 and the recording element substrate H1100 are electrically connected to the second plate H1400. The electric wiring board H1300 is held so as to be.
[0034]
The electrical wiring board H1300 applies an electrical signal for ejecting ink to the recording element substrate H1100. The electrical wiring board H1300 is located at an end portion of the electrical wiring and corresponds to the recording element board H1100. An external signal input terminal H1301 for receiving an electrical signal is provided, and the external signal input terminal H1301 is positioned and fixed on the back side of a tank holder H1500 described later.
[0035]
On the other hand, a flow path forming member H1600 is ultrasonically welded to a tank holder H1500 that detachably holds the ink tank H1900, thereby forming an ink flow path H1501 extending from the ink tank H1900 to the first plate H1200. In addition, a filter H1700 is provided at an end of the ink flow path H1501 that engages with the ink tank H1900 on the ink tank side so that entry of dust from the outside can be prevented. Further, a seal rubber H1800 is attached to the engaging portion with the ink tank H1900 so that the ink can be prevented from evaporating from the engaging portion.
[0036]
Further, as described above, the tank holder portion composed of the tank holder H1500, the flow path forming member H1600, the filter H1700, and the seal rubber H1800, the recording element substrate H1100, the first plate H1200, the electric wiring substrate H1300, and the second A recording head H1001 is configured by bonding the recording element portion formed of the plate H1400 by bonding or the like.
[0037]
(carriage)
Next, the carriage M4001 will be described with reference to FIG.
[0038]
As shown in the drawing, the carriage M4001 is engaged with the carriage M4001 and engaged with the carriage cover M4002 for guiding the recording head H1001 to the mounting position of the carriage M4001, and the tank holder H1500 of the recording head H1001, and the recording head H1000. There is provided a head set lever M4007 that presses to be set at a predetermined mounting position.
That is, the head set lever M4007 is provided on the upper part of the carriage M4001 so as to be rotatable with respect to the head set lever shaft, and a head set plate (not shown) is provided via a spring at the engaging portion with the recording head H1000. The recording head H1001 is pressed by the spring force and is mounted on the carriage M4001.
[0039]
A contact flexible print cable (hereinafter referred to as a contact FPC) E0011 is provided at another engagement portion of the carriage M4001 with the recording head H1001, and a contact portion E0011a on the contact FPC E0011 and a contact provided on the recording head H1001. The unit (external signal input terminal) H1301 is in electrical contact so that various information for recording can be exchanged and power can be supplied to the recording head H1001.
[0040]
Here, an elastic member such as rubber (not shown) is provided between the contact portion E0011a of the contact FPC E0011 and the carriage M4001, and the contact portion E0011a and the carriage are driven by the elastic force of the elastic member and the pressing force by the headset lever spring. Secure contact with M4001 is enabled. Further, the contact FPC E0011 is connected to a carriage substrate E0013 mounted on the back surface of the carriage M4001 (see FIG. 7).
[0041]
[Scanner]
The printer in this embodiment can also be used as a reading device by replacing the recording head with a scanner.
[0042]
The scanner moves together with the carriage on the printer side, and reads a document image fed in place of the recording medium in the sub-scanning direction, and alternately performs the reading operation and the document feeding operation. Thus, one piece of document image information is read.
[0043]
FIG. 6 is a diagram showing a schematic configuration of the scanner M6000.
[0044]
As illustrated, the scanner holder M6001 has a box shape, and an optical system and a processing circuit necessary for reading are accommodated therein. Further, when the scanner M6000 is mounted on the carriage M4001, a scanner reading lens M6006 is provided at a portion facing the document surface, from which a document image is read. The scanner illumination lens M6005 has a light source (not shown) inside, and light emitted from the light source is irradiated onto the document.
[0045]
A scanner cover M6003 fixed to the bottom of the scanner holder M6001 is fitted so as to shield the inside of the scanner holder M6001, and a louver-shaped grip portion provided on the side surface improves the detachability to the carriage M4001. ing. The outer shape of the scanner holder M6001 is substantially the same as that of the recording head cartridge H1000, and the carriage holder M6001 can be attached to and detached from the carriage M4001 by the same operation as that of the recording head cartridge H1000.
[0046]
The scanner holder M6001 accommodates a substrate having the processing circuit, and a scanner contact PCB connected to the substrate is exposed to the outside. When the scanner M6000 is mounted on the carriage M4001, The scanner contact PCB M6004 contacts the contact FPC E0011 on the carriage M4001 side, and the substrate is electrically connected to the control system on the main body side via the carriage M4001.
[0047]
Next, an electrical circuit configuration in the embodiment of the present invention will be described.
FIG. 7 is a diagram schematically showing the overall configuration of the electrical circuit in this embodiment.
[0048]
The electrical circuit in this embodiment is mainly configured by a carriage substrate (CRPCB) E0013, a main PCB (Printed Circuit Board) E0014, a power supply unit E0015, and the like.
Here, the power supply unit is connected to the main PCB E0014 and supplies various driving powers.
The carriage substrate E0013 is a printed circuit board unit mounted on the carriage M4001 (FIG. 2). The carriage substrate E0013 functions as an interface for exchanging signals with the recording head through the contact FPC E0011. Based on the pulse signal output from the sensor E0004, a change in the positional relationship between the encoder scale E0005 and the encoder sensor E0004 is detected, and the output signal is output to the main PCB E0014 through a flexible flat cable (CRFFC) E0012.
[0049]
Further, the main PCB is a printed circuit board unit that controls driving of each part of the ink jet recording apparatus according to this embodiment, and includes a paper edge detection sensor (PE sensor) E0007, an ASF sensor E0009, a cover sensor E0022, a parallel interface (parallel I / F). ) E0016, serial interface (serial I / F) E0017, resume key E0019, LED E0020, power key E0018, buzzer E0021, etc. have I / O ports on the board, and also CR motor E0001, LF motor E0002, PG motor In addition to controlling these drives connected to E0003, connection to ink end sensor E0006, GAP sensor E0008, PG sensor E0010, CRFFC E0012, and power supply unit E0015 Has an interface.
[0050]
FIG. 8 is a block diagram showing the internal configuration of the main PCB.
In the figure, E1001 is a CPU, and this CPU E1001 has an oscillator OSC E1002 inside, and is connected to an oscillation circuit E1005 to generate a system clock by its output signal E1019. Further, it is connected to a ROM E1004 and an ASIC (Application Specific Integrated Circuit) E1006 through a control bus E1014, and controls the ASIC, the input signal E1017 from the power key, and the input signal E1016 from the resume key in accordance with a program stored in the ROM. The state of the cover detection signal E1042 and the head detection signal (HSENS) E1013 is detected, and the buzzer E0021 is further driven by the buzzer signal (BUZ) E1018, and the ink end detection signal (connected to the built-in A / D converter E1003 ( INKS) While detecting the state of E1011 and thermistor temperature detection signal (TH) E1012, it performs various other logical operations and condition determinations, and controls the drive of the ink jet recording apparatus.
[0051]
Here, the head detection signal E1013 is a head mounting detection signal input from the recording head cartridge H1000 via the flexible flat cable E0012, the carriage substrate E0013, and the contact flexible print cable E0011, and the ink end detection signal is the ink end sensor E0006. The thermistor temperature detection signal E1012, which is an analog signal output from, is an analog signal from a thermistor (not shown) provided on the carriage substrate E0013.
[0052]
E1008 is a CR motor driver, which uses a motor power source (VM) E1040 as a drive source, generates a CR motor drive signal E1037 in accordance with a CR motor control signal E1036 from the ASIC E1006, and drives the CR motor E0001. E1009 is an LF / PG motor driver, which uses a motor power source E1040 as a drive source, generates an LF motor drive signal E1035 according to a pulse motor control signal (PM control signal) E1033 from the ASIC E1006, and drives the LF motor thereby At the same time, a PG motor drive signal E1034 is generated to drive the PG motor.
[0053]
E1010 is a power supply control circuit that controls power supply to each sensor having a light emitting element in accordance with a power supply control signal E1024 from the ASIC E1006. The parallel I / F E0016 transmits the parallel I / F signal E1030 from the ASIC E1006 to the parallel I / F cable E1031 connected to the outside, and transmits the signal of the parallel I / F cable E1031 to the ASIC E1006. The serial I / F E0017 transmits the serial I / F signal E1028 from the ASIC E1006 to the serial I / F cable E1029 connected to the outside, and transmits the signal from the cable E1029 to the ASIC E1006.
[0054]
On the other hand, a head power supply (VH) E1039, a motor power supply (VM) E1040, and a logic power supply (VDD) E1041 are supplied from the power supply unit E0015. Also, a head power ON signal (VHON) E1022 and a motor power ON signal (VMOM) E1023 from the ASIC E1006 are input to the power supply unit E0015, and control ON / OFF of the head power E1039 and the motor power E1040, respectively. The logic power supply (VDD) E1041 supplied from the power supply unit E0015 is voltage-converted as necessary, and then supplied to each part inside and outside the main PCB E0014.
[0055]
The head power supply E1039 is smoothed on the main PCB E0014 and then sent to the flexible flat cable E0011 to be used for driving the recording head cartridge H1000.
[0056]
E1007 is a reset circuit that detects a decrease in the logic power supply voltage E1040 and supplies a reset signal (RESET) E1015 to the CPU E1001 and ASIC E1006 to perform initialization.
[0057]
The ASIC E1006 is a one-chip semiconductor integrated circuit and is controlled by the CPU E1001 through the control bus E1014. The above-described CR motor control signal E1036, PM control signal E1033, power supply control signal E1024, head power supply ON signal E1022, and motor power supply The ON signal E1023 and the like are output to exchange signals with the parallel I / F E0016 and the serial I / F E0017, as well as the PE detection signal (PES) E1025 from the PE sensor E0007, and the ASF detection signal from the ASF sensor E0009 ( (ASFS) E1026, GAP detection signal (GAPS) E1027 from GAP sensor E0008, and PG detection signal (PGS) E1032 from PG sensor E0007 are detected, and data representing the state is transmitted to control bus E10. 4 is transmitted to the CPU E1001 through, CPU E1001 based on the input data performs a flashing LEDE0020 controls the driving of an LED drive signal E1038.
[0058]
Further, the state of the encoder signal (ENC) E1020 is detected to generate a timing signal, and the head control signal E1021 is used to interface with the printhead cartridge H1000 to control the printing operation. Here, the encoder signal (ENC) E1020 is an output signal of the CR encoder sensor E0004 inputted through the flexible flat cable E0012. The head control signal E1021 is supplied to the recording head cartridge H1000 via the flexible flat cable E0012, the carriage substrate E0013, and the contact FPC E0011.
[0059]
FIG. 9 is a block diagram showing the internal configuration of the ASIC E1006.
[0060]
In the figure, the connection between each block shows only the flow of data related to the control of the head and each mechanism component, such as recording data and motor control data. Such control signals, clocks, and control signals related to DMA control are omitted in order to avoid complications described in the drawings.
[0061]
In FIG. 9, E2002 is a PLL. As shown in FIG. 9, a clock (CLK) E2031 and a PLL control signal (PLLON) E2033 output from the CPU E1001 are supplied to most of the ASIC E1006. (Not shown).
[0062]
Reference numeral E2001 denotes a CPU interface (CPU I / F). The reset signal E1015, a soft reset signal (PDWN) E2032 output from the CPU E1001, a clock signal (CLK) E2031, and a control signal from the control bus E1014 Controls register read / write for each block as described, supplies clocks to some blocks, accepts interrupt signals (not shown), and outputs an interrupt signal (INT) E2034 to the CPU E1001 Then, the occurrence of an interrupt in the ASIC E1006 is notified.
[0063]
Reference numeral E2005 denotes a DRAM having areas such as a reception buffer E2010, a work buffer E2011, a print buffer E2014, and a development data buffer E2016 as recording data buffers, and a motor control buffer E2023 for motor control. In addition, the buffer used in the scanner operation mode has areas such as a scanner take-in buffer E2024, a scanner data buffer E2026, and a send buffer E2028 in place of the recording data buffers.
[0064]
The DRAM E2005 is also used as a work area necessary for the operation of the CPU E1001. That is, E2004 is a DRAM control unit, which switches between access from the CPU E1001 to the DRAM E2005 by the control bus and access from the DMA control unit E2003 to the DRAM E2005, which will be described later, and performs a read / write operation to the DRAM E2005.
[0065]
The DMA control unit E2003 receives a request (not shown) from each block, and in the case of a write operation (E2038, E2041, E2044, E2053, E2055, address signal, control signal (not shown)), E2057) and the like are output to the RAM control unit to perform DRAM access. In the case of reading, read data (E2040, E2043, E2045, E2051, E2054, E2056, E2058, E2059) from the DRAM control unit E2004 is transferred to the request source block.
[0066]
E2006 is a 1284 I / F. Under the control of the CPU E1001 via the CPU I / F E2001, the parallel I / F E0016 provides a bidirectional communication interface with an external host device (not shown). Reception data (PIF reception data E2036) from FE0016 is transferred to the reception control unit E2008 by DMA processing, and data (1284 transmission data (RDPIF) E2059) stored in the transmission buffer E2028 in the DRAM E2005 is DMA-read when reading the scanner. It is transmitted to the parallel I / F by processing.
[0067]
E2007 is a USB I / F. Under the control of the CPU E1001 via the CPU I / F E2001, the serial I / F E0017 provides a bidirectional communication interface with an external host device (not shown). The received data (USB received data E2037) is transferred to the reception control unit E2008 by DMA processing, and the data (USB transmitted data (RDUSB) E2058) stored in the transmission buffer E2028 in the DRAM E2005 is serialized by DMA processing when the scanner reads. / F Send to E0017. The reception control unit E2008 writes the reception data (WDIF) E2038) from the I / F selected from the 1284 I / F E2006 or USB I / F E2007 to the reception buffer write address managed by the reception buffer control unit E2039. Include.
E2009 is a compression / decompression DMA, and the reception data (raster data) stored in the reception buffer E2010 is controlled from the reception buffer read address managed by the reception buffer control unit E2039 under the control of the CPU E1001 via the CPU I / F E2001. The data is read, the data (RDWK) E2040 is compressed / expanded according to the designated mode, and written as a recording code string (WDWK) E2041 in the work buffer area.
[0068]
E2013 is a recording buffer transfer DMA, which reads out the recording code (RDWP) E2043 on the work buffer E2011 under the control of the CPU E1007 via the CPU I / F E2001, and each recording code is suitable for the data transfer order to the recording head cartridge H1000. The data are rearranged to the addresses on the print buffer E2014 and transferred (WDWP E2044). E2012 is a work clear DMA, and the designated work fill data (WDWF) E2042 is assigned to the area on the work buffer that has been transferred by the recording buffer transfer DMA E2015 under the control of the CPU E1001 via the CPU I / F E2001. Repeat write transfer.
[0069]
E2015 is a recording data expansion DMA, and recording codes written rearranged on the print buffer are triggered by the data expansion timing signal E2050 from the head controller E2018 under the control of the CPU E1001 via the CPU I / F E2001. And the development data written on the development data buffer E2016 are read out to generate development recording data (RDHDG) E2045, which is written into the column buffer E2017 as column buffer write data (WDHDG) E2047. Here, the column buffer E2017 is an SRAM that temporarily stores transfer data (development recording data) to the recording head cartridge H1000, and is based on a handshake signal (not shown) between the recording data expansion DMA and the head control unit. Shared management by both blocks.
[0070]
E2018 is a head control unit that controls the CPU E1001 via the CPU I / F E2001 to interface with the recording head cartridge H1000 or the scanner via a head control signal, and also at the head drive timing from the E2019 encoder signal processing unit E2019. Based on the signal E2049, a data expansion timing signal E2050 is output to the recording data expansion DMA.
[0071]
In recording, the developed recording data (RDHD) E2048 is read from the column buffer according to the head drive timing signal E2049, and the data is output to the recording head cartridge H1000 through the head control signal E1021.
In the scanner reading mode, the take-in data (WDHD) E2053 input through the head control signal E1021 is DMA-transferred to the scanner take-in buffer E2024 on the DRAM E2005. E2025 is a scanner data processing DMA, which is a process in which the acquisition buffer read data (RDAV) E2054 stored in the scanner acquisition buffer E2024 is read out and subjected to processing such as averaging under the control of the CPU E1001 via the CPU I / F E2001. The completed data (WDAV) E2055 is written into the scanner data buffer E2026 on the DRAM E2005.
E2027 is a scanner data compression DMA. Under the control of the CPU E1001 via the CPU I / F E2001, the processed data (RDYC) E2056 on the scanner data buffer E2026 is read, data compression is performed, and compressed data (WDYC) E2057 is sent out. Write to buffer E2028.
[0072]
An encoder signal processing unit E2019 receives an encoder signal (ENC) and outputs a head drive timing signal E2049 according to a mode determined by the control of the CPU E1001, and also the position and speed of the carriage M4001 obtained from the encoder signal E1020. Is stored in a register and provided to the CPU E1001. Based on this information, the CPU E1001 determines various parameters in the control of the CR motor E0001. Reference numeral E2020 denotes a CR motor control unit which outputs a CR motor control signal E1036 under the control of the CPU E1001 via the CPU I / F E2001.
[0073]
E2022 is a sensor signal processing unit that receives each detection signal output from the PG sensor E0010, PE sensor E0007, ASF sensor E0009, GAP sensor E0008, and the like, and detects the sensor information according to the mode determined by the control of the CPU E1001. Is transmitted to the CPU E1001, and a sensor detection signal E2052 is output to the LF / PG motor control unit DMA E2021.
[0074]
The LF / PG motor control DMAE 2021 reads the pulse motor drive table (RDPM) E2051 from the motor control buffer E2023 on the DRAM E2005 and outputs the pulse motor control signal E under the control of the CPU E1001 via the CPU I / F E2001. Depending on the operation mode, a pulse motor control signal E1033 is output using the sensor detection signal as a control trigger.
E2030 is an LED control unit that outputs an LED drive signal E1038 under the control of the CPU E1001 via the CPU I / F E2001. Further, E2029 is a port control unit that outputs a head power ON signal E1022, a motor power ON signal E1023, and a power control signal E1024 under the control of the CPU E1001 via the CPU I / F E2001.
[0075]
Next, the operation of the ink jet recording apparatus according to the embodiment of the present invention configured as described above will be described with reference to the flowchart of FIG.
[0076]
When this apparatus is connected to the AC power source, first, in step S1, a first initialization process of the apparatus is performed. In this initialization process, an electrical circuit system check such as a ROM and RAM check of the apparatus is performed to confirm whether or not the apparatus can operate normally.
[0077]
Next, in step S2, it is determined whether the power key E0018 provided on the upper case M1002 of the apparatus body M1000 is turned on. If the power key E0018 is pressed, the process proceeds to the next step S3. Here, a second initialization process is performed.
[0078]
In this second initialization process, various drive mechanisms and head systems of this apparatus are checked. That is, when initializing various motors and reading head information, it is confirmed whether this apparatus can operate normally.
[0079]
In step S4, an event is waited for. That is, the apparatus monitors a command event from the external I / F, a panel key event by a user operation, an internal control event, and the like, and executes processing corresponding to the event when these events occur.
[0080]
For example, if a recording command event is received from the external I / F in step S4, the process proceeds to step S5. If a power key event is generated by a user operation in the same step, the process proceeds to step S10. If another event occurs in the same step, the process proceeds to step S11.
Here, in step S5, the recording command from the external I / F is analyzed, the designated paper type, paper size, recording quality, paper feeding method, etc. are judged, and data representing the judgment result is stored in the apparatus. Store in RAM E2005 and proceed to step S6.
Next, in step S6, paper feeding is started by the paper feeding method specified in step S5, the paper is sent to the recording start position, and the process proceeds to step S7.
In step S7, a recording operation is performed. In this recording operation, the recording data sent from the external I / F is temporarily stored in the recording buffer, and then the CR motor E0001 is driven to start the movement of the carriage M4001 in the scanning direction. The stored recording data is supplied to the recording head cartridge H1000 to perform recording for one line. When the recording operation for one line of recording data is completed, the LF motor E0002 is driven and the LF roller M3001 is rotated to make a sheet. Are sent in the sub-scanning direction. Thereafter, the above operation is repeatedly executed, and when the recording of one page of recording data from the external I / F is completed, the process proceeds to step 8.
[0081]
In step S8, the LF motor E0002 is driven, the paper discharge roller M2003 is driven, and the paper feeding is repeated until it is determined that the paper is completely sent out from the apparatus. When the paper is finished, the paper is placed on the paper discharge tray M1004a. The paper is completely discharged.
[0082]
Next, in step S9, it is determined whether or not the recording operation for all the pages to be recorded has been completed. If pages to be recorded remain, the process returns to step S5. The above operations are repeated, and when the recording operation for all the pages to be recorded is completed, the recording operation ends, and then the process proceeds to step S4 to wait for the next event.
[0083]
On the other hand, in step S10, printer termination processing is performed to stop the operation of the apparatus. In other words, in order to turn off the power of various motors and heads, after shifting to a state where the power can be turned off, the power is turned off and the process proceeds to step S4 to wait for the next event.
[0084]
In step S11, event processing other than the above is performed. For example, processing corresponding to a recovery command from various panel keys of this apparatus, an external I / F, or a recovery event that occurs internally is performed. After the process is completed, the process proceeds to step S4 and waits for the next event.
[0085]
Hereinafter, the recording head H1001 mounted in the above-described recording apparatus will be described.
[0086]
First, taking a printing element substrate that has been developed in recent years as an example, an analog circuit for acquiring information is mixed with a digital circuit, and an example in which the circuit is driven at a different voltage will be described again. Keep it.
[0087]
FIG. 15 is a block diagram of an ink jet recording head including a circuit that outputs detected temperature information as a digital signal. In the figure, 500 is a recording element substrate in which heaters and drive circuits are integrally formed by a semiconductor process technology, 502 is an ink supply port for supplying ink from the back side of the substrate, and 501 is a driver in which a plurality of heaters and driver circuits are arranged. / Heater array, 503 is a shift register for temporarily storing recording data to be recorded, 507 is a decoder circuit for selecting and driving a desired heater block in the driver / heater array, and 504 is a shift register and decoder. An input circuit including a buffer for inputting a digital signal, 510 is an input terminal, 521 is a temperature detection block that detects the temperature of the substrate, converts the information into a digital signal and outputs it, 522 is information specific to the substrate, for example, Rank the heater resistance value and the ON resistance value of the driver transistor. ROM information reading block for writing information to a non-illustrated non-volatile memory (ROM) arranged on the same substrate, and reading as needed, 523 is specific information to be written to ROM, heater resistance value and transistor ON A rank dividing element 505 for measuring a resistance value is a power supply buffer circuit for supplying a gate voltage to the transistors of the driver array 501.
[0088]
FIG. 16 is a diagram illustrating an equivalent circuit (a) for one segment of the driver / heater array 505 and an equivalent circuit (b) corresponding to one bit of the shift register 503. FIG. 17 is a timing chart showing signal states at various parts from the shift register to the heater. Hereinafter, with reference to FIGS. 16 and 17, a series of operations from sending recording information to the shift register to driving by driving a current through the heater will be described.
[0089]
Recording data is supplied to the DATA terminal in synchronization with the clock pulse applied to the CLK terminal. The shift register temporarily stores the recording data, and the latch circuit holds the data by a latch signal applied to the BG terminal. After that, the block selection signal for selecting the heater group divided into the desired blocks and the recording data held in the latch circuit are ANDed in a matrix form in synchronization with the HE signal that directly determines the current driving time. Heater current flows. This series of operations is repeated for each block of 0-15.
[0090]
FIG. 18 is a block diagram showing a configuration of a temperature detection block 521 that detects the temperature of the printing element substrate 500 and digitizes and outputs the information, and FIG. 19 shows the clock CLK and the output TO of the temperature detection block 521. It is a timing chart which shows the state of this signal. Hereinafter, the operation of the temperature detection block 521 will be described with reference to FIGS.
[0091]
As shown in FIG. 18, the temperature detection block 521 includes a thermal voltage generation unit 840 that generates a voltage having a substantially linear characteristic with respect to the temperature, and a band gap voltage generation unit that generates a voltage that is substantially invariant with respect to the temperature. 830. The outputs from both are passed through the buffer circuit 831 and then compared by the comparator 832, and the temperature information is output from the TO terminal 835. Reference numeral 834 denotes a voltage generating block including a dividing resistor and an analog switch for generating a voltage corresponding to each detected temperature based on the band gap voltage.
[0092]
At this time, the output from the band gap voltage generation unit 830 is set to a voltage value corresponding to the temperature to be detected by the division ratio using a plurality of resistors in the voltage generation block 834, and is connected to the division point of each resistor. The analog switch is sequentially switched by the output of the shift register 836 that operates in synchronization with the clock pulse, so that a digital signal related to temperature at a desired resolution is serially output from the TO terminal 835.
[0093]
Here, the band gap voltage generator 830, the thermal voltage generator 840, and the OP amplifier and comparator 832 used for the buffer 831 in the circuit block are all analog circuits, and are configured by a combination of elements such as transistors, diodes, resistors, and the like. Therefore, its characteristics are determined by its accuracy and voltage dependency. Therefore, it is necessary to design the analog circuit part by accurately understanding the element characteristics, determining the specifications in consideration of the usage conditions (power supply voltage, noise environment, etc.), and predicting the characteristics by circuit simulation based on the specifications. is there.
[0094]
As described above, an analog circuit requires 5 V in order to fully exhibit the characteristics of components used, and a digital circuit requires a voltage of 3.3 V, which is lower than the recent trend. It has become. A specific configuration of the present invention made in view of such a situation will be described below.
[0095]
[First Embodiment]
FIG. 11 is a block diagram for explaining the circuit configuration of the first embodiment of the recording head H1001 according to the present invention. H1100 is a recording element substrate in which a heater and a drive circuit are integrally formed by a semiconductor manufacturing process technology. Is an ink supply port for supplying ink from the back side of the substrate, 101 is a driver / heater array in which a plurality of heaters and driver circuits are arranged, 103 is a shift register for temporarily storing recording data to be recorded, and 107 is a driver / Decoder circuit for selecting and driving a desired heater block in the heater array, 104 an input circuit including a shift register and a buffer for inputting a digital signal to the decoder, 110 an input terminal, 121 a substrate temperature A temperature detection block that detects and converts the information into a digital signal and outputs it. 2 ranks the information specific to the substrate, for example, the heater resistance value and the ON resistance value of the driver transistor, and writes the information into a non-illustrated non-volatile memory (ROM) arranged on the same substrate. ROM information reading block for reading out, 123 is specific information to be written in ROM, a rank dividing element for measuring heater resistance value and ON resistance value of transistor, 130 is an analog power supply (VddA) supplied to temperature detection block 121 ).
[0096]
In the circuit configuration provided on the recording element substrate H1100 of the recording head of this embodiment, the power supply voltage (Vdd) of the digital circuit portion is 3.3 V, and the power supply voltage (VddA) of the analog circuit portion for acquiring information. Is 5V. Only the digital power supply voltage (Vdd) is supplied from the outside except for the power supply voltage applied to the printing element, and the analog power supply voltage (VddA) is supplied to the heater constituting the printing element by the voltage generation circuit 130. Generated from the heater driving power supply voltage (VH).
[0097]
FIG. 12 is a circuit diagram for explaining the circuit configuration of the voltage generating circuit 130 in detail. Here, 201 is a dividing resistor for generating a voltage VddA (analog power supply) from the voltage VH, 202 is an NMOS transistor constituting a source follower serving as a buffer, and 203 is a load resistance of the source follower.
[0098]
With this circuit configuration, the VH voltage is first lowered by the ratio of the resistance division 201, then impedance-converted by the source follower 202 and output from the VddA terminal. At this time, the voltage further decreases by the Vth voltage between the gate and source of the source follower 202.
[0099]
As a specific example, when VH = 11V and Vth of the source follower 202 is 2V in consideration of the back gate effect, the voltage at the dividing point is 7V by setting the ratio of the dividing resistor 201 to 4: 7. VddA that is an output from the source follower 202 can be set to 5V.
[0100]
FIG. 13 is a circuit diagram for explaining another circuit configuration of the voltage generation circuit 130. Here, 301 is an OP amplifier using the VH voltage as a power source, and 302 is a resistor for determining the amplification factor of the non-inverting amplifier constituted by the OP amplifier 301.
[0101]
With this circuit configuration, the power supply voltage (Vdd) of the logic system is amplified by the non-inverting amplifier 301 and output as a VddA voltage.
[0102]
As a specific example, when Vdd = 3.3V, the voltage of the output VddA is set to 5V by determining the value of the resistor 302 so that the amplification factor of the non-inverting amplifier 301 is 1.52. can do.
[0103]
As described above, according to the present embodiment, the analog power supply voltage for acquiring information and the logic (digital) power supply voltage have different voltage values other than the analog power supply voltage supplied to the printing element. In this case, only the power supply voltage for the logic system is supplied from the outside, and the power supply for supplying the recording element with the type of power supplied from the outside to the printhead element substrate by generating the analog power supply voltage internally. In addition to the voltage, only one type can be used, which simplifies the configuration without increasing the price of the entire system, and is advantageous from the viewpoint of space saving and energy saving (power consumption).
[0104]
[Second Embodiment]
Hereinafter, a second embodiment of the recording head of the present invention will be described. In the following description, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
[0105]
FIG. 14 is a block diagram showing a circuit configuration of the second embodiment of the recording head of the present invention, which is substantially the same configuration as that of the first embodiment shown in FIG. Unlike the first embodiment, this embodiment has a capacitor 140 that is externally attached to the output of the analog power supply voltage generation circuit 130.
[0106]
The configuration of the analog power supply voltage generation circuit 130 is generated based on the heater drive power supply voltage VH in any of the cases shown in FIG. 12 or FIG. Since this voltage VH is a driving voltage of the heater, a large noise is likely to occur when a current actually flows through the heater. Furthermore, there is a possibility of being affected by noise such as clock frequency even at other times. Similar noise may occur in the voltage VddA generated based on such a voltage VH. If noise occurs in VddA, analog circuit operation may become unstable or cause malfunction.
[0107]
In the present embodiment, in order to cope with such a phenomenon, a terminal for extracting the output of the analog power supply voltage generation circuit 130 for acquiring information is provided to the outside, and the external terminal is connected to the Vss (Gnd) potential. A capacitor is inserted between them.
[0108]
[Other Embodiments]
The noise countermeasure configuration as described above is particularly effective when the frequency of the clock pulse is 5 MHz or more.
[0109]
In the above embodiment, the substrate temperature has been described as an example of information to be detected by the analog circuit for acquiring information. However, the present invention is not limited to this, and the heater resistance value, the resistance value of the driver transistor, and the switching are described. It goes without saying that the same effect can be expected for analog circuits that handle quantities such as the individual value of speed, the remaining amount of ink, and the protective film thickness.
[0110]
In the above embodiment, the liquid droplets ejected from the recording head have been described as ink, and the liquid stored in the ink tank has been described as ink. However, the storage is limited to ink. It is not a thing. For example, a treatment liquid discharged to the recording medium may be accommodated in the ink tank in order to improve the fixability and water resistance of the recorded image or to improve the image quality.
[0111]
The above embodiment includes means (for example, an electrothermal converter, a laser beam, etc.) that generates thermal energy as energy used for performing ink discharge, particularly in the ink jet recording system, and the ink is generated by the thermal energy. By using a system that causes a change in the state of recording, it is possible to achieve higher recording density and higher definition.
[0112]
As its typical configuration and principle, for example, those performed using the basic principle disclosed in US Pat. Nos. 4,723,129 and 4,740,796 are preferable. This method can be applied to both the so-called on-demand type and continuous type. In particular, in the case of the on-demand type, it is arranged corresponding to the sheet or liquid path holding the liquid (ink). By applying at least one drive signal corresponding to the recording information and applying a rapid temperature rise exceeding the nucleate boiling to the electrothermal transducer, the thermal energy is generated in the electrothermal transducer, and the recording head This is effective because film boiling occurs on the heat acting surface of the liquid and, as a result, bubbles in the liquid (ink) corresponding to the drive signal on a one-to-one basis can be formed.
[0113]
By the growth and contraction of the bubbles, liquid (ink) is ejected through the ejection opening to form at least one droplet. It is more preferable that the drive signal has a pulse shape, since the bubble growth and contraction is performed immediately and appropriately, and thus it is possible to achieve discharge of a liquid (ink) having particularly excellent responsiveness.
[0114]
As this pulse-shaped drive signal, those described in US Pat. Nos. 4,463,359 and 4,345,262 are suitable. Further excellent recording can be performed by employing the conditions described in US Pat. No. 4,313,124 of the invention relating to the temperature rise rate of the heat acting surface.
[0115]
As the configuration of the recording head, in addition to the combination configuration (straight liquid flow path or right-angle liquid flow path) of the discharge port, the liquid path, and the electrothermal transducer as disclosed in each of the above-mentioned specifications, the heat acting surface The configurations using US Pat. No. 4,558,333 and US Pat. No. 4,459,600, which disclose a configuration in which is disposed in a bending region, are also included in the present invention. In addition, Japanese Patent Application Laid-Open No. 59-123670, which discloses a configuration in which a common slot is used as a discharge portion of an electrothermal transducer, or an opening that absorbs a pressure wave of thermal energy is discharged to a plurality of electrothermal transducers A configuration based on Japanese Patent Laid-Open No. 59-138461 disclosing a configuration corresponding to each part may be adopted.
[0116]
Furthermore, as a full-line type recording head having a length corresponding to the width of the maximum recording medium that can be recorded by the recording apparatus, the length is satisfied by a combination of a plurality of recording heads as disclosed in the above specification. Either a configuration or a configuration as a single recording head formed integrally may be used.
[0117]
In addition to the cartridge-type recording head in which the ink tank is integrally provided in the recording head itself described in the above embodiment, it can be electrically connected to the apparatus body by being attached to the apparatus body. A replaceable chip type recording head that can supply ink from the apparatus main body may be used.
[0118]
In addition, it is preferable to add recovery means, preliminary means, and the like for the recording head to the configuration of the recording apparatus described above because the recording operation can be further stabilized. Specific examples thereof include a capping unit for the recording head, a cleaning unit, a pressurizing or sucking unit, an electrothermal converter, a heating element different from this, or a preheating unit using a combination thereof. In addition, it is effective to provide a preliminary ejection mode for performing ejection different from recording in order to perform stable recording.
[0119]
Further, the recording mode of the recording apparatus is not limited to the recording mode of only the mainstream color such as black, but the recording head may be integrated or may be a combination of a plurality of colors. An apparatus having at least one of full colors can also be provided.
[0120]
In the embodiment described above, the description is made on the assumption that the ink is a liquid, but it may be an ink that is solidified at room temperature or lower, or an ink that is softened or liquefied at room temperature, Alternatively, the ink jet method generally controls the temperature of the ink so that the viscosity of the ink is within a stable discharge range by adjusting the temperature within a range of 30 ° C. or higher and 70 ° C. or lower. It is sufficient if the ink sometimes forms a liquid.
[0121]
In addition, it is solidified in a stand-by state in order to actively prevent temperature rise by heat energy as energy for changing the state of ink from the solid state to the liquid state, or to prevent ink evaporation. Ink that is liquefied by heating may be used. In any case, by applying heat energy according to the application of thermal energy according to the recording signal, the ink is liquefied and liquid ink is ejected, or when it reaches the recording medium, it already starts to solidify. The present invention can also be applied to the case of using ink having the property of being liquefied for the first time.
[0122]
In such a case, the ink is held as a liquid or solid in a porous sheet recess or through-hole as described in JP-A-54-56847 or JP-A-60-71260, It is good also as a form which opposes with respect to an electrothermal converter. In the present invention, the most effective one for each of the above-described inks is to execute the above-described film boiling method.
[0123]
Note that the present invention can be applied to a system including a plurality of devices (for example, a host computer, an interface device, a reader, and a printer), and a device (for example, a copying machine and a facsimile device) including a single device. You may apply to.
[0124]
【The invention's effect】
As described above, according to the present invention, compared with the case where both the power supply voltage of the digital circuit and the power supply voltage of the analog circuit are supplied from the outside, it is only necessary to supply the power supply voltage of the digital circuit from the outside. The configuration can be simplified without increasing the price of the entire system, and the configuration can be advantageous from the viewpoint of space saving and energy saving (power consumption).
[Brief description of the drawings]
FIG. 1 is a perspective view showing an external configuration of an ink jet printer according to an embodiment of the present invention.
2 is a perspective view showing a state in which an exterior member of what is shown in FIG. 1 is removed. FIG.
FIG. 3 is a diagram illustrating a state in which a recording head cartridge used in an embodiment of the invention is assembled.
4 is a diagram illustrating a state in which the recording head cartridge illustrated in FIG. 3 is separated into a recording head and an ink tank. FIG.
5 is an exploded perspective view of the recording head shown in FIG.
FIG. 6 is a perspective view showing a scanner cartridge according to an embodiment of the present invention.
FIG. 7 is a block diagram schematically showing an overall configuration of an electrical circuit in an embodiment of the present invention.
8 is a block diagram showing an internal configuration of the main PCB shown in FIG. 7;
9 is a block diagram showing an internal configuration of the ASIC shown in FIG.
FIG. 10 is a flowchart showing the operation of the exemplary embodiment of the present invention.
FIG. 11 is a block diagram showing a circuit configuration of a recording head according to the first embodiment of the invention.
12 is a circuit diagram showing a configuration of the voltage generation circuit of FIG. 11. FIG.
13 is a circuit diagram showing another configuration of the voltage generation circuit of FIG. 11. FIG.
FIG. 14 is a block diagram showing a circuit configuration of a recording head according to a second embodiment of the invention.
FIG. 15 is a block diagram illustrating a circuit configuration of a recording head.
16 is a circuit diagram showing a configuration of each unit in FIG. 15;
FIG. 17 is a timing chart showing signal states at various parts in FIG. 15;
18 is a circuit diagram showing a configuration of a temperature detection block of FIG.
FIG. 19 is a timing chart of the temperature detection block of FIG.
[Explanation of symbols]
101 Heater, driver
103 Shift register
121 Temperature detection block
140 capacitors
202 NMOS transistor
301 op amp
H1000 recording head cartridge
H1001 Recording head
H1100 element substrate

Claims (8)

A heater for generating thermal energy to be applied to the ink in order to eject the ink using thermal energy;
A driver circuit for driving the heater according to print data input from the outside, a shift register for holding the print data, a decoder circuit for selecting and driving the heater, and the shift register and decoder A digital circuit including an input circuit for inputting a digital signal to the circuit;
An analog circuit including sensing means for obtaining information;
Comprising an element substrate formed with
The element substrate is
A voltage generation circuit for generating a voltage for driving the analog circuit from a heater driving power supply voltage input from the outside and supplied to the heater;
The inkjet recording head, wherein a voltage for driving the analog circuit generated by the voltage generation circuit is larger than a power supply voltage input from the outside of the element substrate for driving the digital circuit. The inkjet recording head according to claim 1, further comprising a capacitor having one end connected to a power supply voltage of the analog circuit and the other end grounded outside the element substrate. The inkjet recording head according to claim 1, wherein the voltage generation circuit includes a dividing resistor and a transistor. The inkjet recording head according to claim 1, wherein the voltage generation circuit includes a non-inverting amplifier. The inkjet recording head according to claim 1, wherein the digital circuit further includes a latch that holds the recording data temporarily stored in the shift register. The inkjet recording head according to claim 1, wherein the detection unit detects a temperature of the element substrate. The recording head according to claim 1, wherein the digital circuit includes a memory that stores information relating to a thickness of each layer constituting the element substrate. A recording apparatus that performs recording using the ink jet recording head according to claim 1.

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