JP5454385B2 - Ink droplet ejection apparatus and ink jet recording apparatus including the same - Google Patents

Description

    The present invention relates to an ink jet recording apparatus that forms an image by ejecting ink droplets, and in particular, ink droplet ejection that ejects ink droplets using a piezoelectric element (piezo) as pressure generating means for pressurizing ink in an ink flow path. The present invention relates to a drive waveform generation unit of the apparatus.

    2. Description of the Related Art Inkjet recording apparatuses are known as image forming apparatuses such as printers, facsimiles, copiers, and complex machines of these. This ink jet recording apparatus ejects ink droplets from an ink jet recording head onto a recording medium such as paper or OHP to form a desired image.

  As the ink jet recording head, a piezoelectric element is used as a pressure generating means for pressurizing ink in the ink flow path, and a vibration plate that forms a wall surface of the ink flow path is slightly vibrated by the piezoelectric element, thereby A so-called piezoelectric type that discharges ink droplets by changing the volume of the ink is known.

  There are a plurality (for example, for each nozzle row) of drive waveform generators used in the inkjet recording apparatus in one image forming apparatus. The plurality of drive waveform generation units have different characteristics, and the drive waveforms may have different shapes accordingly.

  The difference in the shape of the drive waveform appears as a difference in ink droplet ejection speed, that is, a difference in ink droplet landing position, or a difference in ink droplet ejection droplet amount, that is, a difference in image density in the printing result. Appearing on the screen may cause the print quality to deteriorate. In view of this, there is already known a technique that suppresses the difference in the ejection speed and the amount of ejected droplets of each drive waveform generator by correcting the drive waveform.

    However, with the conventional drive waveform generator, the correction result of the drive waveform may not reach the target discharge speed or target discharge droplet amount, and correction is performed up to the change in characteristics of the drive waveform generator over time. I did not.

  More specifically, ink droplet ejection is due to changes in the voltage of the driving waveform that drives the piezoelectric element, and the most effective method for estimating the ink droplet ejection speed and ejection droplet amount from the driving waveform is the ink droplet. This is to detect a difference (Peak to Peak voltage) between the maximum voltage and the minimum voltage of the drive waveform during ejection. Even if correction is performed by other detection means, the correction result may not reach the target discharge speed or the target discharge droplet amount.

  Furthermore, when the printing operation is continued for a long time, especially when printing on continuous paper in a line scanning ink jet recording apparatus, if the correction is not applied during the printing operation, it will change over time even during printing. There was a problem that the characteristics of the drive waveform generator could not be accommodated.

    Japanese Patent Application Laid-Open No. 2002-46268 (Patent Document 1) discloses an ink jet recording head driving apparatus that directly reads a change in voltage of a driving waveform with an A / D converter for the purpose of correcting the driving waveform of the ink jet recording head. ing.

    The invention described in Patent Document 1 and the present invention described later are similar in that the potential of the drive waveform is detected to correct the drive waveform. However, the problem that the correction result described in Step 2 of the operation flowchart shown in FIG. 3 of Patent Document 1 may not reach the target discharge speed or the target discharge droplet amount cannot be solved. This is because the voltages of the “reading unit before change in driving voltage” and the “reading unit after change in driving voltage” shown in FIG. 2 of Patent Document 1 are described as constant voltages when viewed in FIG. However, as shown in FIG. 2 of the present invention, since there is a transient voltage change caused by the capacitance component, inductance component, etc. of the piezoelectric element (piezo), the constant value as described in Patent Document 1 is present. This is because voltage detection at points does not necessarily detect the maximum voltage and minimum voltage of the drive waveform during ink droplet ejection.

    The object of the present invention is made in the background as described above, and even during a printing operation, it is possible to keep the ejection speed and the amount of ejected droplets constant by appropriately correcting the drive waveform. An object of the present invention is to provide an ink droplet discharge device and an ink jet recording apparatus including the same.

In order to achieve the above object, the first means of the present invention is:
A plurality of pressure chambers communicating with a plurality of nozzles and storing ink;
A diaphragm disposed over each pressure chamber to form an elastic wall of each pressure chamber;
A pressure generating element disposed to face each of the plurality of pressure chambers via the diaphragm;
In an ink droplet ejection apparatus provided with a drive waveform generation unit that generates drive waveforms by inputting drive waveform data indicating the shape of a drive waveform that drives the pressure generating element, and outputs the drive waveform to the pressure generating element.
The drive waveform generator is
A drive waveform detector for detecting a difference between a maximum voltage and a minimum voltage in an arbitrary period of the drive waveform;
A controller comprising a slave controller (to be described later) for correcting the drive waveform by changing the drive waveform data based on the difference between the maximum voltage and the minimum voltage of the drive waveform detected by the drive waveform detector, To do.

According to a second means of the present invention, in the first means,
The controller is configured to correct the drive waveform by multiplying the drive waveform data by a correction value inversely proportional to the difference between the maximum voltage and the minimum voltage of the drive waveform detected by the drive waveform detector. Is.

A third means of the present invention is the first or second means,
The detection of the difference between the maximum voltage and the minimum voltage of the drive waveform by the drive waveform detector is performed during an idle ejection operation for ejecting ink droplets that do not contribute to image formation during the printing operation. It is.

According to a fourth means of the present invention, in any one of the first to third means,
The drive waveform generation unit is provided for each nozzle row.

In order to achieve the above object, a fifth means of the present invention is an inkjet recording apparatus,
An ink droplet discharge device according to any one of the first to fourth means is provided.

According to a sixth means of the present invention, in the fifth means,
The ink droplet ejection device is a line scanning ink droplet ejection device, and is configured to print on continuous paper by the line scanning ink droplet ejection device.

    The present invention is configured as described above, and an ink droplet ejection apparatus capable of keeping the ejection speed and the amount of ejected droplets constant by appropriately correcting the drive waveform even during a printing operation, and the same An ink jet recording apparatus having the above can be provided.

FIG. 3 is a block diagram of an ink droplet ejection control unit in the ink jet recording apparatus according to the embodiment of the present invention. It is a figure which shows an example of the drive waveform which concerns on the Example of this invention. It is a circuit diagram of the drive waveform detector which concerns on the Example of this invention. It is a flowchart for demonstrating the drive waveform correction process which concerns on the Example of this invention. 1 is a schematic configuration diagram illustrating an overall configuration of a line scanning inkjet recording apparatus in an on-demand system according to an embodiment of the present invention. It is an enlarged plan view showing a configuration example of a head portion in the ink jet recording apparatus. It is an enlarged plan view showing an example of the ink jet recording head. 2 is an exploded perspective view of the ink jet recording head. FIG.

Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 5 is a schematic configuration diagram showing an overall configuration of a line scanning ink jet recording apparatus in an on-demand system according to an embodiment of the present invention.

  As shown in the figure, the ink jet recording apparatus 14 is disposed between the paper supply unit 2 and the paper collection unit 13. The continuous paper 1 fed out from the paper supply unit 2 at high speed is formed with a desired color image by the ink jet recording apparatus 14 and is taken up and collected by the paper collection unit 13.

  The sheet conveying device in the inkjet recording apparatus 14 includes a regulation guide 3 for positioning the sheet 1 supplied from the sheet supply unit 2 in the width direction, an infeed unit 4 composed of a driven roller and a driving roller, and a tension of the sheet 1. The dancer roller 5 that moves up and down to output a position signal, the EPC (Edge Position Control) 6 that controls the meandering of the paper 1, the meandering amount detector 7 that is used for feedback of the meandering amount, and the speed at which the paper 1 is set And an outfeed section 11 composed of a driven roller and a driving roller that rotate at a constant speed, and a puller 12 composed of a driving roller and a driven roller for discharging the paper 1 out of the apparatus.

  This sheet conveying apparatus is a tension control type conveying apparatus that detects the position of the dancer roller 5 and controls the rotation of the infeed unit 4 to keep the tension of the sheet 1 being conveyed constant.

  In the ink jet recording apparatus 14, a recording unit 8, a platen 9 provided so as to face the recording unit 8, and a drying unit 10 are provided.

  The recording means 8 has a line-shaped recording head in which printing nozzles are arranged over the entire printing width, and color printing is performed by black, cyan, magenta, and yellow recording heads, and the nozzle surface of each recording head is on the platen 9. Are supported with a predetermined gap. The recording unit 8 ejects ink droplets in synchronization with the paper transport speed, thereby forming a color image on the paper 1.

  The drying unit 10 dries and fixes the ink to prevent the ink printed by the recording unit 8 from adhering to other parts. In this embodiment, the drying means 10 uses a non-contact drying apparatus, but may be a contact-type drying apparatus.

  In the on-demand type line scanning ink jet recording apparatus as shown in FIG. 5, when the printing operation is started after the maintenance mechanism such as a cap (not shown) is removed, the first ejection causes non-ejection or ejection bending. There is a possibility that ejection cannot be performed normally. Therefore, it has a pre-printing empty discharge function that performs maintenance by discharging ink onto a paper 1 that has a little influence on the printed image at a place deviated from the paper 1 before starting printing.

  In addition, during a printing operation, there is a possibility that ink is not ejected for a long time at a specific nozzle, and the nozzle surface may be dried and cause non-ejection or ejection bend, and thus ejection may not be performed normally. is there. Therefore, it has a function of empty discharge between pages to perform maintenance by discharging ink to a place where there is little influence on the printed image such as between pages.

FIG. 6 is an enlarged plan view showing an example of the configuration of the head unit.
In the case of this embodiment, the head section 14 is constituted by an aggregate of a black head array 14K, a cyan head array 14C, a magenta head array 14M, and a yellow head array 14Y. It extends in a direction orthogonal to the transport direction (arrow direction).

  Each head array 14 is composed of a plurality of ink jet recording heads 15 arranged in a zigzag pattern, and in this embodiment, an example in which the ink jet recording heads 15 are arranged in a zigzag pattern in two rows each is shown. In this way, the inkjet recording head 15 is arrayed to ensure a wide print area width.

FIG. 7 is an enlarged plan view showing an example of the ink jet recording head 15.
As shown in the figure, the ink jet recording head 15 has a large number of nozzles 16 arranged in a staggered manner. In this embodiment, an example in which 64 nozzles 16 are arranged in two rows in a staggered manner is shown. ing. In this way, a large number of nozzles 16 are arranged in a staggered manner, thereby supporting high resolution.

FIG. 8 is an exploded perspective view of the inkjet recording head 15.
In the figure, 16 is a nozzle, 17 is a nozzle plate, 18 is a pressure chamber, 19 is a pressure chamber plate, 20 is a restrictor, 21 is a restrictor plate, 22 is a diaphragm, 23 is a filter, 24 is a diaphragm plate, and 25 is A common ink flow path, 26 is a housing, 27 is a piezoelectric element group, 28 is a piezoelectric element, and 29 is a support substrate.

  A nozzle plate 17 in which a large number of nozzles 16 are arranged in a staggered manner, a pressure chamber plate 19 formed by a pressure chamber 18 corresponding to each nozzle 16, a common ink flow path 25, and a pressure chamber 18 communicate with each other. A flow path substrate is formed by sequentially positioning and joining a restrictor plate 21 having a restrictor 20 that controls the flow rate of ink to a plate 18 and a diaphragm plate 24 having a diaphragm 22 and a filter 23. .

  The flow path substrate is joined to the housing 26 so that the filter 23 faces the opening of the common ink flow path 25. Reference numeral 31 denotes an ink introduction pipe connected to the common ink flow path 25 of the housing 26.

  A piezoelectric element group 27 configured by arranging a large number of piezoelectric elements 28 on a support substrate 29 is inserted from an insertion opening 30 provided in the housing 26, and the free ends of the piezoelectric elements 28 are bonded to the diaphragm 22. By fixing, the ink jet recording head 15 is configured.

  In FIG. 8, the number of nozzles 16, pressure chambers 18, restrictors 20, piezoelectric elements 28, and the like are reduced to simplify the drawing. Further, since the ink droplet ejection operation in the inkjet recording head 15 is the same as that of the conventional one, the description of the operation is omitted.

FIG. 1 is a block diagram of an ink droplet ejection control unit according to an embodiment of the present invention.
As shown in the figure, the ink droplet ejection control unit is provided with a plurality of (two in this embodiment) drives for the master controller 32, the paper transport encoder 33, and one inkjet recording head 15. The waveform generator 40 is configured.

  Further, the drive waveform generation unit 40 includes a slave controller 35, a memory 34, a D / A converter 36, a voltage amplifier 37, a current amplifier 38, and a drive waveform detector 39.

  As shown in the figure, the master controller 32 transmits drive waveform data indicating the shape of the drive waveform, ejection timing signals, and printing data indicating the ink droplet size of each nozzle 16 to each slave controller 35.

  The drive waveform data is selected in a matrix form according to the ink temperature and the characteristics of the inkjet recording head 15. As for the ejection timing signal, the paper conveyance encoder 33 transmits an encoder pulse signal corresponding to the conveyance position of the paper 1 to the master controller 32, and the master controller 32 synchronizes the conveyance of the paper and the ink ejection timing based on the encoder pulse signal. It is generated by taking.

  The slave controller 35 once stores the drive waveform data received from the master controller 32 in the memory 34. When the slave controller 35 receives the ejection timing signal from the master controller 32, the slave controller 35 extracts the drive waveform data from the memory 34 and corrects the extracted drive waveform data to the correction value. And then output to the D / A converter 36.

  The D / A converter 36 converts the received corrected drive waveform data into an analog voltage and outputs it to the voltage amplifier 37. The voltage amplifier 37 amplifies the analog voltage and outputs it to the current amplifier 38. The current amplifier 38 amplifies the voltage-amplified analog signal and outputs it to the ink jet recording head 15 as a final drive waveform.

  The ink jet recording head 15 generates a waveform based on the printing data by means described later with reference to FIG. 2, and drives the piezoelectric element 28 shown in FIG.

  The drive waveform detector 39 detects the difference (Peak to Peak voltage) between the maximum voltage and the minimum voltage of the drive waveform at the time of inter-page idle discharge, and is digitized by a built-in A / D converter (not shown). The waveform detection data is output to the slave controller 35. The slave controller 35 is configured to calculate a correction value to be multiplied by the drive waveform data from the received drive waveform detection data.

  The drive waveform generator 40 is arranged for each unit for outputting a drive waveform. In this embodiment, as shown in FIG. 7, two nozzle rows are provided in one ink jet recording head 15, so that the drive waveform is generated. The generation unit 40 includes two circuits. That is, a common drive waveform is supplied from one drive waveform generation unit 40 to one nozzle row. Therefore, in the case of the head array 14 shown in FIG. 6, the drive waveform generation unit 40 is obtained by multiplying the number of inkjet recording heads 15 to be used by two circuits. That is, in the case of FIG. 6, since (6 × 4 =) 24 ink jet recording heads 15 are arranged, the drive waveform generation unit 40 has 48 circuits, which is twice that number.

  FIG. 2 is a diagram illustrating an example of a drive waveform according to the embodiment of the present invention. In this figure, driving waveforms and fine driving pulse waveforms when ink droplets of three sizes of large, medium, and small are ejected are shown.

  At the time of printing, the input image data is switched based on a control table (not shown), and a desired pulse is selected and output. For example, when printing a large dot, the print data applied to the switch circuit (not shown) at time S2, time S3, and time S4 in FIG. 4A is set to “1”, and from time S2 to time S4. By setting the print data to “0”, the first pulse, the second pulse, and the third pulse are supplied to the piezoelectric element as shown in FIG.

  When printing medium-sized dots, the second and third pulses are supplied to the piezoelectric element as shown in FIG. 10C, and when printing small-sized dots, as shown in FIG. Only the first pulse is supplied to the piezoelectric element to print a dot of the desired size. The fine drive pulse shown in FIG. 5 (e) realizes a function of stirring the ink by slightly vibrating the meniscus without ejecting the ink droplet. The drive pulse (first through second) for ejecting the ink droplet is realized. The voltage amplitude is lower than that of (three pulses).

FIG. 3 is a circuit diagram of the drive waveform detector 39.
The operational amplifier Z2, the operational amplifier Z4, and their peripheral circuits in the figure constitute a peak hold circuit, and output the maximum voltage Vmax of the drive waveform Vcom. The analog switch SW1 performs the peak hold operation by turning OFF in synchronization with the drive waveform output timing of the inter-page idle ejection, and performs the refresh operation by turning ON at timings other than from the peak hold operation to the capture of the drive waveform detection data.

  The operational amplifier Z2 can also be configured with a comparator. Depending on the driving waveform, it is desirable to use a high-speed type for the operational amplifiers Z2 and Z4.

  The operational amplifier Z1 and its peripheral circuit constitute a differential amplifier circuit that outputs a difference Vcnt−Vcom between the temporary reference voltage Vcnt and the drive waveform Vcom. The operational amplifier Z3, the operational amplifier Z5, and their peripheral circuits constitute a peak hold circuit, which outputs the minimum voltage of the drive waveform Vcom in the form of the maximum voltage of Vcnt-Vcom, that is, Vcnt-Vmin.

  The analog switch SW2 performs the peak hold operation by turning off in synchronization with the drive waveform output timing of the inter-page idle ejection, and performs the refresh operation by turning on at timings other than from the peak hold operation to taking in the drive waveform detection data.

  The analog switch SW1 and the analog switch SW2 are used in synchronization. Depending on the timings of SW1 and SW2, any one of the fine drive pulse, the first pulse, the second pulse, and the third pulse in FIG. 2 can be arbitrarily selected. The operational amplifier Z3 can also be configured with a comparator. Depending on the driving waveform, it is desirable to use a high-speed type for the operational amplifiers Z1, Z3, and Z5. The temporary reference voltage Vcnt is arbitrarily set so that Vcnt> Vmin. There is a timing when the output of the operational amplifier Z1 and the input / output of the operational amplifier Z3 are 0V or less, but since it is an input of the peak hold circuit, there is no problem even with a single power supply.

  The operational amplifier Z6 and its peripheral circuit constitute an adder circuit, adds Vmax and Vcnt−Vmin, and outputs an inverted output. That is, the output of the operational amplifier Z6 is Vmin−Vmax−Vcnt. Since the output of the operational amplifier Z6 is 0 V or less, at least Z6 is not a single power supply but a dual power supply.

  The operational amplifier Z7 and its peripheral circuits constitute an adder circuit, which outputs an inverted output of the addition of the temporary reference voltage Vcnt and Vmin−Vmax−Vcnt, that is, Vpp = Vmax−Vmin. Since the input of the operational amplifier Z7 is 0 V or less, at least Z7 is not a single power source but a dual power source.

  The A / D converter converts Vpp into a digital value and outputs it to the slave controller 35 as drive waveform detection data.

  Note that the output range of the operational amplifiers Z1 to Z7, the power source, the peripheral constant (amplification factor of the operational amplifier), and the value of the temporary reference voltage Vcnt are selected so that the outputs of the operational amplifiers Z1 to Z7 are not saturated.

FIG. 4 is a flowchart for explaining the drive waveform correction processing.
In the initial state, the analog switch SW1 and the analog switch SW2 are turned on to refresh the peak hold circuit (step 1). When printing preparatory printing is started by a command from the master controller 32 (step 2) and the pre-printing idle discharge is executed (YES in step 3), the analog switch SW1 and the analog switch SW2 are turned off (step 4). Then, the peak hold circuit starts the peak hold operation, and the pre-printing idle discharge is performed by the command of the master controller 32 (step 5).

  Thereafter, drive waveform detection data obtained by converting Vpp into a digital value by the A / D converter is captured (step 6), and a drive waveform data correction value is calculated based on the drive waveform detection data captured in step 14 (step 7). Then, the analog switch SW1 and the analog switch SW2 are turned on to refresh the peak hold circuit (step 8). If idle ejection is not performed before printing (NO in step 3), steps 4 to 8 are skipped.

  Next, printing is started by a command from the master controller 32 (step 9), and then the drive waveform data correction value calculated in step 7 or step 15 described later is applied, that is, using the drive waveform data correction value. After the correction drive waveform data is created (step 10) and the inter-page idle ejection is performed (YES in step 11), the analog switch SW1 and the analog switch SW2 are turned off (step 12), and the peak hold circuit Starts the peak hold operation.

  Next, the inter-page idle discharge is performed by the command of the master controller 32 (step 13), and then the drive waveform detection data is captured (step 14), and the drive waveform data correction value is calculated based on the captured drive waveform detection data. (Step 15) The analog switch SW1 and the analog switch SW2 are turned ON to refresh the peak hold circuit (Step 16).

  During the printing operation, Step 10 to Step 17 are repeated, and when the printing operation is terminated by a command from the master controller 32 (YES in Step 17), the sequence is terminated.

  Note that drive waveform data can be captured at an arbitrary timing by changing the sequence timing in accordance with the drive waveform timing. For example, in the drive waveform of FIG. 2, the analog switch SW1 and the analog switch SW2 in step 4 or step 12 are turned OFF in synchronization with the start timing of time S3, and the drive waveform data is captured in synchronization with the end timing of time S3 ( If step 6 or step 14), correction value calculation of drive waveform data (step 7 or step 15), and analog switch SW1 and analog switch SW2 are turned on (step 8 or step 16), drive waveform data at the timing of time S3 are performed. Can be imported.

  The simplest method for calculating the drive waveform data correction value is to divide the proportionality constant by the drive waveform detection data. For this purpose, the proportional relationship between the drive waveform detection data, that is, the difference between the maximum voltage and the minimum voltage of the drive waveform, the discharge speed and the amount of discharged droplets is determined in advance by measurement or the like, and the proportional relationship is used.

  For example, when the difference between the maximum voltage and the minimum voltage of the drive waveform is Vpp and the ejected droplet amount is Mj, the relationship is expressed as the following equation (1).

Mj = Amj × Vpp (1)
Note that Amj in the formula is a constant. Next, when the difference between the maximum voltage and the minimum voltage of the drive waveform when obtaining the target value Mjt of the ejection droplet amount is Vppt, the following expression (2) is obtained by substituting into the above expression (1).

Mjt = Amj × Vppt (2)
Here, when the difference between the maximum voltage and the minimum voltage of the detected drive waveform is Vpp1, if the difference between the maximum voltage and the minimum voltage of the drive waveform is adjusted to Vppt, the target value of the ejected droplet amount Assuming that Mjt can be obtained, the correction value Vc1 for the voltage difference Vpp1 can be defined as the following equation (3).

Vc1 = Vppt / Vpp1 (3)
Therefore, the difference Vppt between the maximum voltage and the minimum voltage of the drive waveform is taken as a constant and divided by the difference Vpp1 between the maximum voltage and the minimum voltage of the detected drive waveform, whereby the correction value Vc1 can be obtained. On the other hand, by multiplying the correction value Vc1, the difference between the maximum voltage and the minimum voltage of the drive waveform can be corrected to Vppt.

  The main features of the present invention will be described as follows.

  Correct the drive waveform by detecting the difference between the maximum voltage and the minimum voltage of the drive waveform during the inter-page idle ejection that actually ejects ink droplets, and correcting the drive waveform based on the detection result Can be done.

  In addition, by detecting the difference between the maximum voltage and the minimum voltage of the drive waveform and correcting the drive waveform between pages, it can be corrected without stopping printing and keeping the print quality within each page constant. Can do.

    DESCRIPTION OF SYMBOLS 1 ... Paper, 8 ... Recording means, 14 ... Head array, 15 ... Inkjet recording head, 16 ... Nozzle, 17 ... Nozzle plate, 18 ... Pressure chamber, 19 ... Pressure chamber plate, 20 ... Restrictor, 21 ... Restrictor plate, 22 ... Vibration plate, 23 ... Filter, 24 ... Diaphragm plate, 25 ... Common ink flow path , 26 ... housing, 27 ... piezoelectric element group, 28 ... piezoelectric element, 29 ... support substrate, 32 ... master controller, 33 ... paper transport encoder, 34 ... memory, 35 ... Slave controller, 36 ... D / A converter, 37 ... Voltage amplifier, 38 ... Current amplifier, 39 ... Drive waveform detector, 40 ... Drive waveform generator, X. ..Ink Head recording device.

JP 2002-46268 A

Claims (6)

A plurality of pressure chambers communicating with a plurality of nozzles and storing ink;
A diaphragm disposed over each pressure chamber to form an elastic wall of each pressure chamber;
A pressure generating element disposed to face each of the plurality of pressure chambers via the diaphragm;
In an ink droplet ejection apparatus provided with a drive waveform generation unit that generates drive waveforms by inputting drive waveform data indicating the shape of a drive waveform that drives the pressure generating element, and outputs the drive waveform to the pressure generating element.
The drive waveform generator is
A drive waveform detector for detecting a difference between a maximum voltage and a minimum voltage in an arbitrary period of the drive waveform;
An ink droplet ejection apparatus comprising: a controller that corrects a drive waveform by changing the drive waveform data based on a difference between a maximum voltage and a minimum voltage of the drive waveform detected by the drive waveform detector. The ink droplet ejection device according to claim 1,
The controller is configured to correct the drive waveform by multiplying the drive waveform data by a correction value inversely proportional to the difference between the maximum voltage and the minimum voltage of the drive waveform detected by the drive waveform detector. Ink droplet ejection device. The ink droplet ejection apparatus according to claim 1 or 2,
Ink having a configuration in which the difference between the maximum voltage and the minimum voltage of the drive waveform by the drive waveform detector is detected during an idle ejection operation for ejecting ink droplets that do not contribute to image formation during the printing operation. Drop ejection device. In the ink droplet ejection apparatus according to any one of claims 1 to 3,
An ink droplet ejection apparatus, wherein the drive waveform generation unit is provided for each nozzle row.   An ink jet recording apparatus comprising the ink droplet ejection apparatus according to claim 1. The inkjet recording apparatus according to claim 5, wherein
An ink jet recording apparatus, wherein the ink droplet ejecting apparatus is a line scanning ink droplet ejecting apparatus, and is configured to print on continuous paper by the line scanning ink droplet ejecting apparatus.

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