JP3658297B2 - Recording head and recording apparatus using the recording head - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a recording head and a recording apparatus using the recording head, and in particular, a digital circuit including a recording element and a driving unit that drives the recording element in accordance with input recording data, and information relating to recording (information relating to the state of the substrate). The present invention relates to a recording head provided with an element substrate formed by a semiconductor process and a recording apparatus using the 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]
The output from these sensing elements is often an analog signal, and the signal processing circuit for applying feedback to the drive signal using this is basically an analog signal. Many. Such an analog signal has a problem that it is easily affected by noise. In order to cope with this problem, Japanese Patent Application No. 11-198095 discloses that these analog signals are converted into digital values by analog-digital conversion means formed on the same substrate, and then sent to a signal processing circuit for driving. A configuration for optimizing signals has also been proposed.
[0005]
In either case, there are circuit blocks that handle analog signals on the substrate, and there are also cases where a circuit that detects a minute signal level or performs detection with high resolution is mounted. On the other hand, on a substrate integrally formed with a heater and a drive circuit used in these recording heads, a shift register for temporarily storing image data to be recorded, a latch circuit for holding it, and driving Circuit blocks that operate by digital signals, such as a decoder circuit for sequentially selecting heaters, are also formed using the same process. These digital circuits are supplied with clock signal pulses that serve as a reference for their operation.
[0006]
That is, the analog signal processing circuit for detecting the substrate state and the digital signal processing circuit for driving the heater according to the image data exist on the same substrate of the recording head. The recording speed required for such a recording head and recording apparatus is increasing year by year, and accordingly, the clock frequency for image data transfer tends to increase. As the recording speed increases, the driving frequency of the heater that generates heat for recording tends to increase, and the amount of heat generated per unit time tends to increase and the temperature of the entire substrate tends to increase. . For this reason, it is necessary to increase the accuracy of the function of detecting the temperature rise of the substrate and feeding back the drive.
[0007]
In order to avoid the malfunction of the analog circuit system that detects the temperature with high accuracy due to the influence of radiation noise and line noise generated from the digital circuit system due to the high clock frequency, A configuration has been proposed in which digital power supplies are supplied from separate power supplies to suppress noise from entering each other. In this case, the analog power supply and the digital power supply are supplied to the circuit on the substrate via different power supply lines and power supply terminals, respectively.
[0008]
[Problems to be solved by the invention]
However, in the above conventional example, two power supply paths exist at positions close to the recording head. When the power supply line (wiring) to be supplied is short, a large effect is produced in reducing noise. If the power supply line to the power supply terminal on the head is long, the clock pulse supplied to the digital system due to the inductance component of the power supply line and the capacitance component with other lines The problem is that radiation noise, coupling noise, and the like due to the noise are mixed in the signal of the analog circuit and the accuracy of the analog system is deteriorated and further malfunction occurs.
[0009]
In addition, providing separate power supplies for the analog circuit system and the digital circuit system is unavoidable when the voltages are different from each other, but they are duplicated when they are the same voltage (for example, 5 V). Become inefficient.
[0010]
The first object of the present invention is to suppress the mixing of noise between the analog and digital power supplies even when the power line such as a flexible cable or printed circuit board wiring is extended for a long time, and the clock frequency is high Another object of the present invention is to provide a recording head and a recording apparatus using the recording head that do not deteriorate the accuracy of a circuit that handles minute analog signals, such as a temperature detection circuit.
[0011]
A second object of the present invention is to provide a recording head and a recording head that can suppress the mixing of noise in the mutual circuit system while using the same power supply when the analog system power supply voltage and the digital system power supply voltage are the same voltage. It is to provide a recording apparatus used.
[0012]
[Means for Solving the Problems]
  To achieve the above object, a recording head according to the present invention includes a digital circuit including a recording element and a driving unit that drives the recording element in accordance with input recording data, and a detecting unit that detects information about the state of the element substrate. An analog circuit includingA plurality of terminals for electrical connection;An element substrate formed by a semiconductor process;
  The element substrateThrough the terminal and flexible cableAnd an electric circuit board having a plurality of external input terminals for inputting / outputting signals to / from the element board.And
  The power supply wiring of the digital circuit and the power supply wiring of the analog circuit are connected in common to the other end of the capacitor whose one end is grounded in the electric circuit board, and the power supply wiring of the digital circuit and the power supply of the analog circuit The wiring is arranged so as not to be adjacent in the element substrate.With
Of the plurality of terminals of the element substrate, the terminal to which the power supply wiring of the digital circuit is connected and the terminal to which the power supply wiring of the analog circuit is connected are spaced apart from each other with the other terminals on the element substrate. Are arranged inIt is characterized by that.
[0013]
The above object can also be achieved by a recording apparatus that performs recording using the recording head.
[0014]
  That is, a digital circuit including a recording element and a driving unit that drives the recording element according to input recording data, an analog circuit including a detection unit that detects information about recording,A plurality of terminals for electrical connection;An element substrate formed by a semiconductor process;It is connected to the terminal of the element board via a flexible cable.In a recording head having an electric circuit board having a plurality of external input terminals for inputting / outputting signals to / from the element board, the power wiring of the digital circuit and the power wiring of the analog circuit are connected to the one end in the electric circuit board. Are connected in common to the other end of the grounded capacitor so that the power supply wiring of the digital circuit and the power supply wiring of the analog circuit are not adjacent to each other in the element substrate.In addition, among the plurality of terminals of the element substrate, the terminal to which the power supply wiring of the digital circuit is connected and the terminal to which the power supply wiring of the analog circuit is connected are arranged at positions spaced apart from each other on the element substrate..
[0015]
In this way, it is possible to avoid the noise of the digital circuit from being mixed into the analog circuit, and to reduce the noise level itself.
[0016]
As a result, for example, the operation accuracy of analog circuits such as a substrate temperature detection circuit and a heater resistance value monitor circuit is improved, and as a result, an improvement in performance such as improvement in recording quality of the recording head and prevention of malfunction is realized.
[0017]
  MoreIn the element substrate, the power supply wiring of the digital circuit and the power supply wiring of the analog circuitAre arranged so that they are not adjacentThus, it is possible to suppress noise generated inside the element substrate from being mixed with each other.
[0018]
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.
[0019]
In the embodiments described below, a printer is taken as an example of a recording apparatus using an inkjet recording method.
[0020]
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.
[0021]
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.
[0022]
Furthermore, “ink” (sometimes referred to as “liquid”) is to be interpreted widely as the definition of “print” above, and by being applied on a print medium, an image, a pattern, a pattern, etc. Or a liquid that can be subjected to ink processing (eg, solidification or insolubilization of colorant in ink applied to the print medium).
[0023]
[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, a discharge tray M1004, and a chassis M3019 ( (See FIG. 2).
[0024]
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.
[0025]
Further, one end of the discharge tray M1004 is rotatably held by the lower case M1001, and the opening formed on the front surface 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.
[0026]
One end of the access cover M1003 is rotatably held by the upper case M1002, and an opening formed on the upper surface can be opened and closed. By opening the access cover M1003, the access cover M1003 is accommodated inside the main body. It is possible to replace the print head cartridge H1000 or the ink tank H1900. Although not particularly 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.
[0027]
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 method and color change, and by notifying the operator of a printer trouble or the like by leveling the buzzer E0021 (FIG. 7). When the trouble is solved, the recording is resumed by pressing the resume key E0019.
[0028]
[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.
[0029]
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.
[0030]
(Recording part)
Here, the recording unit will be described.
[0031]
The carriage M4001 is movably supported by the carriage shaft M4021, and the recording head cartridge H1000 is detachably mounted on the carriage M4001.
[0032]
Recording head cartridge
First, the recording head cartridge will be described with reference to FIGS.
[0033]
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.
[0034]
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.
[0035]
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.
[0036]
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 electric 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.
[0037]
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.
[0038]
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.
[0039]
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.
[0040]
(carriage)
Next, the carriage M4001 will be described with reference to FIG.
[0041]
As shown in the figure, 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. 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.
[0042]
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.
[0043]
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).
[0044]
[Scanner]
The printer in this embodiment can also be used as a reading device by replacing the recording head with a scanner.
[0045]
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.
[0046]
FIG. 6 is a diagram showing a schematic configuration of the scanner M6000.
[0047]
As shown in the figure, 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.
[0048]
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 of 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.
[0049]
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.
[0050]
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.
[0051]
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 transmitting and receiving signals to and from the recording head through the contact FPC E0011, and an encoder according to the movement of the carriage M4001. 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.
[0052]
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, 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.
[0053]
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, the buzzer signal (BUZ) E1018 drives the buzzer E0021, 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.
[0054]
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.
[0055]
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.
[0056]
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.
[0057]
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.
[0058]
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.
[0059]
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.
[0060]
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 control signal E1024, head power ON signal E1022, and motor power 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.
[0061]
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.
[0062]
FIG. 9 is a block diagram showing the internal configuration of the ASIC E1006.
[0063]
In the figure, the connection between each block shows only the flow of data related to the control of the head and each mechanical 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.
[0064]
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).
[0065]
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.
[0066]
E2005 is 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.
[0067]
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.
[0068]
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.
[0069]
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.
[0070]
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 in accordance with the designated mode, and is written in the work buffer area as a recording code string (WDWK) E2041.
[0071]
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.
[0072]
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 in 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.
[0073]
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 the head control signal, and also to drive the head 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.
[0074]
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.
[0075]
An encoder signal processing unit E2019 receives the 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.
[0076]
E2022 is a sensor signal processing unit which 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.
[0077]
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 a 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.
[0078]
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.
[0079]
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.
[0080]
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.
[0081]
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.
[0082]
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.
[0083]
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 recording of recording data for one page from the external I / F is completed, the process proceeds to step 8.
[0084]
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.
[0085]
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.
[0086]
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.
[0087]
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.
[0088]
Hereinafter, a circuit configuration of the recording head H1001 in the present embodiment will be described.
[0089]
FIG. 11 is a diagram for explaining the circuit configuration of the recording head H1001 of the present embodiment. H1100 is a recording element substrate in which a heater and a drive circuit are integrally formed by a semiconductor process technology, and 102 is ink from the back surface of the substrate. Ink supply ports for supplying, 101 a driver / heater array in which a plurality of heaters and driver circuits are arranged, 103 a shift register for temporarily holding recording data to be recorded, and 107 a desired register in the driver / heater array A decoder circuit for selecting and driving the heater block, 104 is an input circuit including a shift register and a buffer for inputting a digital signal to the decoder, 110 is an input terminal, 121 is a temperature of the substrate, and detects the information. Temperature detection block that converts and outputs a digital signal, 122 is information specific to the board, For example, the heater resistance value, the ON resistance value of the driver transistor, etc. are ranked, and the information is written in a non-illustrated non-volatile memory (ROM) arranged on the same substrate, and ROM information for reading as necessary. A reading block 123 is specific information to be written in the ROM, a rank dividing element for measuring the heater resistance value and the ON resistance value of the transistor, and 105 is a power supply buffer circuit for supplying a gate voltage to the transistors of the driver array 101.
[0090]
H1300 is an electric wiring board on which an external signal input terminal H1301 to which a clock signal (CLK), a power supply voltage (Vdd), an analog power supply voltage (VddA) and the like are input is formed, and 160 is a power supply voltage (Vdd). It is a capacitor for noise component removal that is commonly connected to the analog power supply voltage (VddA). The recording element substrate H1100 and the electrical wiring substrate H1300 are connected by a flexible cable 150.
[0091]
FIG. 12 is a diagram showing an equivalent circuit (a) for one segment of the driver / heater array 105 and an equivalent circuit (b) corresponding to one bit of the shift register 103. FIG. 13 is a timing chart showing signal states at various parts from the shift register to the heater. Hereinafter, with reference to FIGS. 12 and 13, a series of operations from when recording information is sent to the shift register to when it is driven by supplying current to the heater will be described.
[0092]
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.
[0093]
At this time, since the frequency of the clock pulse is a high frequency of 1 MHz to 20 MHz, the power supply terminal Vdd that supplies power to the input circuit 104 and the shift register 103 connected to the clock pulse input terminal CLK is as shown in FIG. Noise due to high-frequency components rides in synchronization with the clock pulse.
[0094]
FIG. 14 is a block diagram showing the configuration of the temperature detection block 121 that detects the temperature of the printing element substrate H1100, digitizes the information, and outputs the digitized information. FIG. 15 shows the clock CLK and the output TO of the temperature detection block 121. It is a timing chart which shows the state of this signal. Hereinafter, the operation of the temperature detection block 121 will be described with reference to FIGS. 14 and 15.
[0095]
As shown in FIG. 14, the temperature detection block 121 includes a thermal voltage generator 1401 that generates a voltage having a substantially linear characteristic with respect to the temperature, and a band gap voltage generator that generates a voltage that is substantially invariant with respect to the temperature. 1402. The outputs from both are passed through the buffer circuit 1403 and then compared by the comparator 1404 to output temperature information from the TO terminal.
[0096]
At this time, the output from the band gap voltage generator 1402 is set to a voltage value corresponding to the temperature to be detected by the division ratio using a plurality of resistors 1405, and the switch 1406 connected to the dividing point of each resistor 1405 is set. By sequentially switching with a shift register that operates in synchronization with the clock pulse, digital information relating to temperature at a desired resolution can be obtained. In this embodiment, the thermal voltage generator 1401 generates a voltage having a temperature characteristic of 10 mV / ° C., and the voltage at the dividing point of the plurality of resistors 1405 is 12 points in increments of 50 mV. As a result, the comparison result by the comparator 1404 for 12 temperatures at intervals of 5 ° C. is serially output from the T0 terminal in synchronization with the clock signal. Therefore, the same result as that obtained by digitally converting the result of comparing the temperature in the range of 60 ° C. with the resolution of 5 ° C. is obtained.
[0097]
At this time, since the thermal voltage generation unit 1401 and the band gap voltage generation unit 1402 handle a minute voltage of about 10 mV, noise due to the above clock is present in the power supply line from the power supply terminal VddA of the temperature detection block 121. It is desirable to avoid mixing as much as possible.
[0098]
For this reason, in this embodiment, as shown in FIG. 11, on the recording element substrate H1100, the Vdd terminal is used so that noise caused by the clock pulse does not enter (is not transmitted to) the temperature detection block 121 via the power supply terminal. And VddA terminals are spaced apart from each other so as not to be adjacent to each other. Also in the wiring path in the recording element substrate H1100, these wirings are separated so as not to transmit noise, and are arranged so as not to be adjacent to each other.
[0099]
Further, in the flexible cable 150 that connects the recording element substrate H1100 and the electric wiring substrate H1300, the thin wires are arranged in parallel over a relatively long distance (about several tens of centimeters). The inductance component and the capacitance component between the wirings have a great influence, and here, there is a high possibility that digital noise caused by high-frequency clock pulses is mixed in the analog signal.
[0100]
In this embodiment, in order to reduce this noise contamination, a capacitor 160 is connected between the GND terminal and the portion where the Vdd terminal and the VddA terminal are short-circuited on the electric wiring board H1300 as shown in FIG. Yes. Thereby, it is configured to suppress mixing of noise in the flexible cable 150 and the electric wiring board H1300.
[0101]
Note that it is desirable to use a capacitor 160 having excellent frequency characteristics as much as possible in order to cut high frequency noise, and the capacitance value is preferably about 0.1 μF to 10 μF.
[0102]
As described above, according to the present embodiment, the terminal to which the analog circuit power supply voltage is applied and the terminal to which the digital circuit power supply voltage is applied are short-circuited in the vicinity of the external input terminal of the electric circuit board of the recording head. Further, by adding a bypass capacitor to this, it is possible to avoid the noise of the digital circuit from being mixed into the analog circuit and to reduce the noise level itself.
[0103]
Further, according to the present embodiment, the noise generated inside the substrate is mixed with each other by arranging the power supply terminal of the analog circuit and the power supply terminal of the digital circuit so as not to transmit noise in the element substrate. This can be suppressed.
[0104]
As a result, for example, the operation accuracy of analog circuits such as a substrate temperature detection circuit and a heater resistance value monitor circuit is improved, and as a result, an improvement in performance such as improvement in recording quality of the recording head and prevention of malfunction is realized.
[0105]
In the present embodiment, the configuration on the electric circuit wiring such as a short circuit between the power supply voltage terminal of the analog circuit and the power supply voltage terminal of the digital circuit and the addition of a bypass capacitor, the analog circuit power supply and the digital circuit in the recording element substrate Although the example provided with both the structure which spaced apart and arrange | positioned the power supply was demonstrated, even if it is a structure provided only with either one, the above each effect can be acquired.
[0106]
The noise countermeasure configuration as described above is particularly effective when the clock pulse frequency is 5 MHz or more.
[0107]
In the present embodiment, the substrate temperature, the heater resistance value, and the like have been described as examples of information to be detected by the analog circuit. However, the present invention is not limited to this, and the resistance value of the driver transistor, the individual value of the switching speed, the ink It goes without saying that the same effect can be expected for analog circuits that handle quantities such as the remaining amount and protective film thickness.
[0108]
[Other Embodiments]
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.
[0109]
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.
[0110]
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 driving 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.
[0111]
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 liquid (ink) discharge with particularly excellent responsiveness can be achieved.
[0112]
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.
[0113]
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.
[0114]
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.
[0115]
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 mounted on the apparatus body. A replaceable chip type recording head that can supply ink from the apparatus main body may be used.
[0116]
In addition, it is preferable to add recovery means for the recording head, preliminary means, etc. to the configuration of the recording apparatus described above, since the recording operation can be further stabilized. Specific examples thereof include a capping unit for the recording head, a cleaning unit, a pressure or suction 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.
[0117]
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.
[0118]
In the embodiment described above, the description is made on the assumption that the ink is a liquid. However, even if the ink is solidified at room temperature or lower, it may be 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.
[0119]
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 liquefying for the first time.
[0120]
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.
[0121]
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.
[0122]
【The invention's effect】
As described above, according to the present invention, the noise of the digital circuit can be avoided from being mixed into the analog circuit, and the noise level itself can be lowered.
[0123]
As a result, for example, the operation accuracy of analog circuits such as a substrate temperature detection circuit and a heater resistance value monitor circuit is improved, and as a result, an improvement in performance such as improvement in recording quality of the recording head and prevention of malfunction is realized.
[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.
FIG. 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 illustrating a circuit configuration of a recording head according to an embodiment of the invention.
FIG. 12 is an equivalent circuit diagram for explaining an embodiment of the present invention.
FIG. 13 is a timing chart for explaining an embodiment of the present invention.
FIG. 14 is a block diagram (temperature detection block) for explaining the contents of the embodiment of the present invention.
FIG. 15 is a timing chart of the temperature detection block in the embodiment of the present invention.
FIG. 16 is a timing chart for explaining the effect of the present invention;
[Explanation of symbols]
101 Heater, driver
121 Temperature detection block
103 Shift register
150 Flexible cable
160 capacitor
M4000 recording unit
M4001 Carriage
M4002 Carriage cover
M4007 Headset lever
M5000 recovery unit
E0011 Contact FPC (Flexible Print Cable)
E0012 CRFFC (flexible flat cable)
E0013 Carriage board
E0014 main board
E0015 Power supply unit
H1000 recording head cartridge
H1001 Recording head
H1100 element substrate
H1200 first plate
H1201 Ink supply port
H1300 Electric wiring board
H1301 External signal input terminal
H1400 second plate
H1500 tank holder
H1501 ink flow path
H1600 flow path forming member
H1700 filter
H1800 seal rubber
H1900 ink tank

Claims (10)

A digital circuit including a recording element and a driving unit that drives the recording element according to input recording data, and an analog circuit including a detecting unit that detects information on the state of the element substrate, and a plurality of electrical circuits for electrical connection And an element substrate formed by a semiconductor process,
The elements are connected through the terminals and the flexible cable of the substrate, have a electric circuit board having a plurality of external input terminals for inputting and outputting signals to the element substrate,
The power supply wiring of the digital circuit and the power supply wiring of the analog circuit are commonly connected to the other end of the capacitor whose one end is grounded on the electric circuit board, and the power supply wiring of the digital circuit and the power supply of the analog circuit The wiring is arranged so as not to be adjacent in the element substrate ,
Of the plurality of terminals of the element substrate, the terminal to which the power supply wiring of the digital circuit is connected and the terminal to which the power supply wiring of the analog circuit is connected are spaced apart from each other with the other terminals on the element substrate. A recording head characterized by being arranged in   The recording head according to claim 1, wherein the digital circuit includes a shift register that temporarily stores the recording data, and a latch that holds the data stored in the shift register.   3. The recording head according to claim 1, wherein the analog circuit includes means for detecting a temperature outside the element substrate or means for monitoring a heater resistance value.   The recording head according to claim 1, wherein the recording head is an ink jet recording head that performs recording by discharging ink.   The recording head according to claim 4, wherein the recording element includes an electrothermal transducer for generating thermal energy to be applied to the ink so as to eject the ink using thermal energy.   The recording head according to claim 5, wherein the detection unit detects a temperature of the element substrate.   The digital circuit includes a memory that stores at least one of a resistance value of the electrothermal transducer, a resistance value when the driving unit is operated, and information on a thickness of each layer constituting the element substrate. The recording head according to claim 5, wherein the recording head is a recording head.   The recording head according to claim 1, wherein the capacitor has a capacitance of 0.1 μF or more.   The recording head according to claim 8, wherein the capacitor has a capacitance of 10 μF or less.   A recording apparatus that performs recording using the recording head according to claim 1.

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