JP2010137528A - Inkjet recording apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique which enables an interval in the vertical direction between characters which are printed by each nozzle to be regulated in an inkjet recording apparatus having two nozzles. <P>SOLUTION: When two nozzles print matrix characters of the same vertical dot number, the electrostatic charging voltage is made changeable for each nozzle. Thus, the problem that the interval between the top and bottom characters cannot be adjusted can be solved. Also, the interval between the top and bottom characters can be adjusted by making ink particles which are jetted from the nozzle located on the upper side deviate downward, and making ink particles which are jetted from the nozzle located on the lower side deviate upward. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an ink jet recording apparatus, for example, an industrial ink jet recording apparatus used for marking a product.

  Conventional ink jet recording apparatuses include a single nozzle recording head and a two nozzle recording head. Here, for an ink jet recording apparatus having two nozzles, for example, as shown in Patent Documents 1 to 3, the deflection directions of the ink particles ejected from the two nozzles are the same, and the two nozzles are used. The difference between the maximum charging voltage and the minimum charging voltage (hereinafter, abbreviated as charging voltage width) when matrix characters having the same number of vertical dots are printed is also the same.

JP 2005-515918 A European Patent No. 0262004 European Patent No. 0949077

  Therefore, since there is an arrangement distance between the nozzles, the interval between the characters printed by the two nozzles physically increases, and the interval cannot be adjusted. This will be described in more detail. 1 and 2 are diagrams showing a printing state of an ink jet recording apparatus having two conventional nozzles.

  First, the printing example of FIG. 1 will be described. In FIG. 1, the two nozzles both print a vertical 5-dot matrix character, the nozzle 14 positioned above the deflection direction indicates “E”, and the nozzle 19 positioned below the deflection direction indicates “ The letter “B” is printed.

  In the ink jet recording apparatus, since the landing position of the ink particles is determined by the magnitude of the charging voltage, in the printing example of the nozzle 14 in FIG. A character is formed by applying a minimum charging voltage of 70 V to 28 and a maximum charging voltage of 190 V to the uppermost dot 29 located on the uppermost side. The charging voltage width at this time is 120V. In addition, the charging waveform is a stepped wave as shown in FIG.

  On the other hand, similarly to the nozzle 14, the nozzle 19 has a minimum charging voltage of 70V applied to the lowest dot 31 and a maximum charging voltage of 190V applied to the uppermost dot 32 to form a matrix character of 5 dots vertically. The charging voltage width at this time is 120 V, similar to the nozzle 19.

  Thus, in the conventional control method, the charging voltage widths of the two nozzles are always the same.

  Further, as shown in FIG. 1, since the deflection directions of the ink particles ejected from the two nozzles are the same, and there is also an arrangement distance L between the nozzles, there is a physical between characters printed by each nozzle. A large interval will occur.

  A narrower space between the upper and lower characters looks better, and it is possible to cope with a small print space, so it is desirable to reduce the character spacing. However, the above-mentioned conventional technology cannot adjust the space between characters narrowly. Cannot print on small printed matter (small space).

  The printing example in FIG. 2 has the same problem as in FIG. That is, in the printing example of FIG. 2, the nozzle 14 applies a charging voltage of 70 V to the ink particles of the lowest dot 28 and a charging voltage of 190 V to the ink particles of the uppermost dot 29, and the charging voltage width at this time is 120V. . On the other hand, the nozzle 19 located on the lower side applies a charging voltage of −190 V to the ink particles of the lowest dot 31 and −70 V to the ink particles of the uppermost dot 32, and the charging voltage width is 120 V, which is the same as the nozzle 14. is there. As in the example of FIG. 1, the example of FIG. 2 has the same deflection direction of the two nozzles and the arrangement distance L exists, so that a phenomenon occurs in which a large interval is generated between printed characters.

  The present invention has been made in view of such circumstances, and provides a technique for making it possible to adjust the interval between characters printed by each nozzle in an inkjet recording apparatus having two nozzles. .

  In order to solve the above-described problems, the present invention provides an ink jet recording apparatus that has first and second nozzles and prints dot-matrix characters in parallel on an object to be printed by ink particles ejected from the respective nozzles. A first charging electrode for charging ink particles ejected from the first nozzle, a second charging electrode for charging ink particles ejected from the second nozzle, and a first First deflection means for deflecting the ink particles charged by the charging electrode in the first deflection direction, and second deflection means for deflecting the ink particles charged by the second charging electrode in the second deflection direction And control means for controlling the charging voltage applied to the ink particles by the first and second charging electrodes based on the input character data to be printed, the dot matrix, and the printing control information including the number of stages. Equipped with a. The first and second deflection directions by the first and second deflection means are the same. In addition, when the first and second nozzles respectively print matrix characters having the same number of vertical dots, the control means controls the width of the first charging voltage applied by the first charging electrode (maximum charging voltage and minimum charging voltage). The charging voltage value is controlled so that the width of the second charging voltage applied by the second charging electrode is different from that of the character printed by the first nozzle and the character printed by the second nozzle. Adjust the vertical spacing.

  The ink jet recording apparatus further includes a charging voltage table that stores combinations of first and second charging voltage values (including values of the maximum charging voltage and the minimum charging voltage) corresponding to the print control information. At this time, the control means acquires the combination of the first and second charging voltages corresponding to the print control information from the charging voltage table.

  In another aspect of the ink jet recording apparatus, the control means controls the same charging voltage width applied to the ink particles by the first and second charging electrodes. The first and second deflection directions by the first and second deflection means are different. In this case, the second deflecting unit deflects the ink particles ejected from the second nozzle located on the lower side of the first and second nozzles upward. The first deflecting unit deflects the ink particles ejected from the first nozzle located on the upper side downward. Here, the first and second deflecting means may include a first deflecting electrode to which a predetermined voltage is applied and a second and third deflecting electrode that are grounded, respectively, which are shared by them. . That is, the first and second deflecting means may be constituted by three deflecting electrodes.

  In another aspect, the control means prints the ink particles output from the second nozzle by applying a charging voltage from the maximum charging voltage to the minimum charging voltage in order to the second charging electrode. Ink particles output from the first nozzle are charged in order from the lowest dot to the highest dot of the character data, and the charging voltage is applied to the first charging electrode from the minimum charging voltage to the maximum charging voltage in order. Is charged in order from the most significant dot to the least significant dot of the character data to be printed.

  In another aspect, the control means prints the ink particles output from the second nozzle by applying the charging voltage from the minimum charging voltage to the maximum charging voltage in order to the second charging electrode. Ink particles output from the first nozzle are charged in order from the most significant dot to the least significant dot of the character data, and the charging voltage is applied to the first charging electrode from the maximum charging voltage to the minimum charging voltage in order. Is charged in order from the lowest dot to the highest dot of the character data to be printed.

  Further features of the present invention will become apparent from the best mode for carrying out the present invention and the accompanying drawings.

  According to the present invention, even in an ink jet recording apparatus having two nozzles, it is possible to adjust the interval between characters printed by two nozzles.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be noted that this embodiment is merely an example for realizing the present invention, and does not limit the technical scope of the present invention. In each drawing, the same reference numerals are assigned to common components.

1) First Embodiment <Internal Configuration of Inkjet Recording Apparatus>
FIG. 3 is a diagram showing a schematic configuration of the ink jet recording apparatus according to the present invention. As shown in FIG. 3, the inkjet recording apparatus of the present invention includes an MPU (microprocessing unit) 1 that controls the entire inkjet recording apparatus, and a RAM (random access) that temporarily stores data in the inkjet recording apparatus. Memory) 2, ROM (read-only memory) 3 that stores programs in advance, a display device 4 that displays contents to be printed, a panel interface 5, a panel 6 for inputting character information to be printed, and a print target An object detection circuit 7, a print control circuit 8 for controlling the printing operation of the ink jet recording apparatus, a charging RAM 9 for storing charging data for charging ink particles ejected from the nozzle 14, and an ink ejected from the nozzle 19. A charging RAM 10 for storing charging data for charging particles; A character signal generating circuit 11 for making the charging signal 9 a charging signal, a character signal generating circuit 12 for making the charging data 10 a charging signal, a bus line 13 for sending data and the like, and a deflection direction for ejecting ink. Nozzle 14, charging electrode 15 that makes ink ejected from nozzle 14 become particles and applies charges to the ink particles, plus deflection electrode 16 of nozzle 14, minus deflection electrode 17 of nozzle 14 (plus deflection electrode 16 and minus deflection) The electrode 17 forms an electric field), and a gutter 18 that collects ink particles ejected from the nozzle 14 and not used for printing.

  In addition, with respect to the nozzle 14, the nozzle 19 is a nozzle located on the lower side with respect to the deflection direction for ejecting ink. Further, the ink jet recording apparatus is configured such that the ink ejected from the nozzle 19 becomes particles, and a charge electrode 20 that applies a charge to the ink particles, a plus deflection electrode 21 of the nozzle 19, and a minus deflection electrode 22 (plus deflection electrode 21) of the nozzle 19. The negative deflection electrode 22 forms an electric field), the gutter 23 that collects ink particles ejected from the nozzle 19 and that is not used for printing, and the ink collected from the gutter 18 and the gutter 23 is supplied to the nozzle again. And a sensor 25 for detecting the printing object, and a conveyor 27 for conveying the printing object 26 to be printed.

  Next, the printing operation of the ink jet recording apparatus having the above-described configuration will be briefly described. First, when information such as the content to be printed on the panel 6 is input via the panel interface 5, the MPU 1 is charged with charging data (stored in a table (not shown)) for charging the ink particles by a program stored in the ROM 3. Is created according to the print information. Further, the MPU 1 stores charging data to be printed by the nozzles 14 through the bus line 13 in the charging RAM 9 and stores charging data to be printed by the nozzles 19 in the charging RAM 10.

  When the printing object detection sensor 25 detects the printing object 26, a print start command reaches the MPU 1 through the printing object detection circuit 7. The MPU 1 sends the charging data stored in the charging RAM 9 to the character signal generation circuit 11 and sends the charging data stored in the charging RAM 10 to the character signal generation circuit 12 via the bus line 13.

  The print control circuit 8 controls the timing of sending this charging signal to the charging electrode 15 and the charging electrode 20 through the bus line 13. In the nozzle 14, the ejected ink becomes particles in the charging electrode 15, receives electric charge, is deflected by flying through the electric field formed by the plus deflection electrode 16 and the minus deflection electrode 17, and is transferred to the printing material 26. Printed by particles flying and adhering. Similarly to the nozzle 14, the ejected ink is converted into particles in the charging electrode 20 and receives electric charges in the nozzle 19, and is deflected by flying through the electric field formed by the plus deflection electrode 21 and the minus deflection electrode 22. Printing is performed by the ink particles flying and adhering to the substrate 26.

  The ink particles are deflected according to the charge amount of the ink particles. The deflection amount of ink particles having a large charge amount is large, and the deflection amount of particles having a small charge amount is small. Ink that has not been used for printing, that is, uncharged ink particles, is collected from the gutter 18 and the gutter 23 and supplied again to the nozzles 14 and 19 by the pump 24. The ink jet recording apparatus having two nozzles performs printing by the above method.

<Character spacing adjustment>
The upper and lower character spacing adjustment operation (processing before printing) in the first embodiment will be described with reference to FIGS. FIG. 4 is a flowchart for explaining an upper / lower character adjustment operation (an operation in which one nozzle prints dots in one vertical column). In an inkjet recording apparatus having two nozzles, one nozzle corresponds to one nozzle. A control flow for printing dots in one vertical column is shown. FIG. 5 shows a print example according to the first embodiment.

  In FIG. 4, first, an operator inputs information such as character data to be printed by the nozzles 14 and 19 from the panel 6 (see FIG. 3), such as the character data size, the number of steps of the dot matrix characters, and the distance between the upper and lower character strings. The MPU 1 of the recording apparatus receives it (steps S101 and S102).

  Next, the MPU 1 controls the nozzle 14 based on information (printing control information) such as character data to be printed by the nozzle 14 input by the operator, the size of the dot matrix character, the number of steps, and the space between the upper and lower character strings. Then, the number of vertical dots in one vertical column is calculated by the function of the software written in the ROM 3 (step S103). In the case of the example of FIG. 5, the number of vertical dots of the dot matrix character is 5 dots, and the number of stages is 1, so the number of vertical dots printed by the nozzle 14 is 5.

  Then, the MPU 1 takes in the maximum charging voltage and the minimum charging voltage (190 V and 120 V in the example of FIG. 5) from a charging voltage table (not shown) (step S104). For example, software that can control the charging amount of the charging voltage for each nozzle is provided, and the maximum charging voltage and the minimum charging voltage of the nozzle 14 and the nozzle 19 are determined in advance based on the character type and the dot matrix combination. Information is preloaded in the software and written in the ROM 3 (charging voltage table). From this charging voltage table, the optimum combination of the maximum charging voltage and the minimum charging voltage is selected according to the size of the dot matrix character, the character data (type), the number of steps, the interval between the upper and lower character strings, and the like.

  Subsequently, the MPU 1 initializes a dot number counter (not shown) and acquires character information of one vertical column printed by one nozzle (steps S105 and S106). Then, the MPU 1 sets the least significant particle in one vertical column as a count “1” and compares it with the number of vertical dots (step S107). Here, the number of vertical dots is compared with the counter so that the particles are counted in order from the lowest particle to the highest particle.

  Further, the MPU 1 determines whether or not the least significant particle is required for forming the character information dot matrix (step S108). If the particles are required (Yes in step S108), the MPU 1 calculates the magnitude of the charging voltage based on the information on the maximum charging voltage and the minimum charging voltage written in the ROM 3 (step S109). On the other hand, if the particle is not required (No in step S108), the MPU 1 regards the ink particle as an uncharged particle (step S110). Then, the MPU 1 writes the magnitude of the calculated charging voltage or information (charging data) regarding uncharged particles into the charging RAM 9 (see FIG. 3) via the bus line 13 (step S111). Further, every time charging data is written in the charging RAM 9, the MPU 1 adds 1 (incrementing the dot counter) to the dot counter (step S112).

  By repeating such processing, the charging data of the charging voltage of each particle is written in the charging RAM 9 in order. The charging data stored in the charging RAM 9 is sent to the character signal generating circuit 11 through the bus line 13. Then, the character signal generation circuit 11 converts the charging data into a charging voltage waveform of the charging signal. In this way, the charging waveform is created based on the predetermined maximum charging voltage and minimum charging voltage information by the nozzle 14. The control method for the nozzle 19 is exactly the same as that for the nozzle 14.

  By preliminarily storing information on the maximum charging voltage and the minimum charging voltage respectively charged in the nozzle 14 and the nozzle 19 in the software as described above, it is possible to set the charging voltage for each nozzle in advance. Since the deflection amount of the ink particles can be controlled by the magnitude of the charging voltage, the landing position of the ink particles ejected for each nozzle can be set in advance by this function.

  Ink particles ejected from the inkjet recording device fly while drawing a curve and adhere to the printed material. Therefore, ink particles with a high charge voltage even with the same charge voltage width print larger than ink particles with a low charge voltage. It has the feature of doing. For example, as shown in FIG. 6, even when the charging voltage width is the same as 50V, the higher charging voltage (minimum charging voltage 200V, maximum charging voltage 250V) is the lower charging voltage (minimum charging voltage 100V, maximum charging voltage 150V). Will print larger characters.

  Therefore, when the charging voltage of the character located below the deflection direction is increased and brought closer to the upper character, the lower charging voltage width is made larger than the upper charging voltage width to print the same size character. It is essential to set it small.

  In the conventional control method, as shown in FIGS. 1 and 2, the charging voltage width is always set to be the same. Therefore, even if the character “B” in FIG. 1 is brought close to the character “E”, if the same charging voltage width is used, the size of the character “B” is larger than that of the character “E”, and the printing balance becomes worse. The problem arises.

  Therefore, by executing the printing method according to the first embodiment, the charging voltage width can be changed for each nozzle. 5, the charging voltage of the nozzle 14 is exactly the same as the charging voltage of the nozzle 14 of FIG. 2, while the minimum charging voltage of the nozzle 19 is set to 200V and the maximum charging voltage is set to 280V. By setting the charging voltage width to 80 V, the character “B” can be printed close to the character “E”, and the charging voltage width can be reduced to print characters of the same size.

2) Second Embodiment In the conventional printing with two nozzles, as shown in FIGS. 1 and 2, the deflection direction of the ink particles is the same, and this causes a problem that the interval between printed characters cannot be reduced. is there.

  In order to solve this problem, in the first embodiment, the spacing between characters and the size of characters are adjusted by changing the charging voltage of the nozzles 14 and 19. On the other hand, in the second embodiment, the deflection directions of the ink particles ejected from the two nozzles are made different. That is, the ink particles ejected from the nozzle 19 located on the lower side are deflected upward, and the ink particles ejected from the nozzle 14 located on the upper side are deflected downward, as in the first embodiment. , It is possible to solve the problem of “wide character spacing”.

  FIG. 7 is a diagram showing an outline of a printing example in the second embodiment. In FIG. 7, the same charging voltage is applied to the charging electrodes 15 and 20 with respect to the nozzle 14 and the nozzle 19, and the positions of the plus deflection electrode 16 and the minus deflection electrode 17 in FIG. By switching, the deflection direction of the ink particles ejected from the nozzle 14 is changed from the upper side to the lower side. The deflection of the ink particles ejected from the nozzle 19 is the same as that of the nozzle 19 in FIG. As described above, even when the nozzle 14 and the nozzle 19 are deflected so that the ink particles face each other even at the same charging voltage, the interval between characters can be reduced as shown in FIG.

  Note that the ink jet recording apparatus (see FIG. 3) shown in the first embodiment can also be applied to the second embodiment.

3) Third Embodiment FIG. 8 is a diagram illustrating an outline of a printing example according to the third embodiment. Means for realizing the printing operation according to the third embodiment are basically the same as those of the second embodiment. However, the only difference is the number of deflection electrodes. In the second embodiment, the ink particles are deflected by using four deflection electrodes as shown in FIG. 7, but the positive deflection electrode 17 and the positive deflection electrode 21 are at the same potential. In the embodiment, the plus deflection electrode 17 and the plus deflection electrode 21 are integrated into one plus electrode. As a result, the same function as in the second embodiment can be realized, and the structure of the deflection electrode can be simplified.

4) Fourth Embodiment In the second and third embodiments, the ink particles ejected from the nozzles 19 are deflected upward, and the ink particles ejected from the nozzles 14 are deflected downward so that there is a gap between characters. It becomes possible to solve the problem that the interval is wide.

  However, the second and third embodiments also have drawbacks. The ink jet recording apparatus employs the principle that printing is performed while the printing object 26 is relatively moved substantially perpendicular to the deflection direction of the ink particles. When the charging order (charging waveform) to the ink particles of the two nozzles is the same, the deflection directions of the ink particles ejected from the two nozzles are different, as shown in the printing results of FIGS. In this case, the characters are not evenly inclined, which causes a problem of poor printing appearance.

  In order to solve this problem, in the fourth embodiment, as shown in FIG. 9, the charging order of the ink particles ejected from the nozzle 19 is ejected from the nozzle 14 from the least significant dot to the most significant dot. The ink particles are charged in order from the most significant dot to the least significant dot. Thereby, it is possible to make the inclination of the characters uniform.

5) Fifth Embodiment In the fifth embodiment, as shown in FIG. 10, the charging order of the ink particles ejected from the nozzle 19 is ejected from the nozzle 14 from the highest dot to the lowest dot. The same effect as in the fourth embodiment can be obtained by charging the ink particles in order from the lowest dot to the highest dot.

<Summary>
According to the present embodiment, when two nozzles print the same number of vertical dots, the charging voltage can be changed for each nozzle to solve the problem that the interval between the upper and lower characters cannot be adjusted. It becomes possible.

  Also, the interval between upper and lower characters can be adjusted by deflecting ink particles ejected from the nozzle located on the upper side downward and deflecting ink particles ejected from the nozzle located on the lower side upward. Can do.

  Furthermore, the structure of the deflecting unit can be simplified by configuring the normally four deflecting electrodes by three.

  Ink particles from the lower nozzle are charged in order from the lowest dot to the highest dot, while ink particles from the upper nozzle are charged in order from the highest dot to the lowest dot. . Thereby, in an ink jet recording apparatus having two nozzles with different deflection directions, it is possible to uniformly align the inclination of dot matrix characters printed by the respective nozzles.

  In addition, the ink particles from the lower nozzle are charged in order from the highest dot to the lowest dot, while the ink particles from the upper nozzle are charged in order from the lowest dot to the highest dot. To. As a result, even in an ink jet recording apparatus having two nozzles with different deflection directions, it is possible to uniformly align the inclination of the dot matrix characters printed by each nozzle.

  The ink jet recording apparatus may be configured by combining the first embodiment and any one of the second to fifth embodiments.

It is a figure which shows the outline | summary (1) which shows the printing by the conventional 2 nozzles. It is a figure which shows the outline | summary (2) which shows the printing by the conventional 2 nozzles. 1 is a diagram illustrating an overall configuration of an ink jet recording apparatus according to the present invention. It is a flowchart for demonstrating the character space | interval adjustment operation | movement (pre-processing for a printing process) in this invention. It is a figure which shows the outline | summary of the character space | interval adjustment operation | movement by 1st Embodiment. It is a figure which shows the difference in the ink particle landing by the difference in the magnitude | size of a deflection voltage. It is a figure which shows the outline | summary of the character space adjustment operation | movement by 2nd Embodiment. It is a figure which shows the outline | summary of the character space | interval adjustment operation | movement by 3rd Embodiment. It is a figure which shows the outline | summary of the character space | interval adjustment operation | movement by 4th Embodiment. It is a figure which shows the outline | summary of the character space adjustment operation | movement by 5th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... MPU, 2 ... RAM, 3 ... ROM, 4 ... Display apparatus, 5 ... Panel interface, 6 ... Panel, 7 ... Printed object detection circuit, 8 ... Print control circuit, 9 ... Charge data of nozzle 14 is stored Charging RAM, 10... Charging RAM for storing charging data of nozzle 19, 11... Character signal generating circuit for charging RAM 9, 12... Character signal generating circuit for charging RAM 10, 13. 15 ... Charging electrode of the nozzle 14, 16 ... Plus deflection electrode of the nozzle 14, 17 ... Minus deflection electrode of the nozzle 14, 18 ... Gutter of the nozzle 14, 19 ... Nozzle positioned below the deflection direction, 20 ... Charging electrode of nozzle 19; 21 ... Positive deflection electrode of nozzle 19; 22 ... Negative deflection electrode of nozzle 19; 23 ... Gutter of nozzle 19; 25 ... Printed object detection sensor, 26 ... Printed object, 27 ... Conveyor, 28 ... Lowest dot printed by nozzle 14, 29 ... Highest dot printed by nozzle 14, 30 ... Vertical 1 printed by nozzle 14 A dot in a row, 31... The lowest dot printed by the nozzle 19, 32... A top dot printed by the nozzle 14, 33.

Claims (6)

An inkjet recording apparatus that has first and second nozzles and prints dot-matrix characters in parallel on an object to be printed with ink particles ejected from the nozzles,
A first charging electrode for charging ink particles ejected from the first nozzle;
A second charging electrode for charging ink particles ejected from the second nozzle;
First deflection means for deflecting ink particles charged by the first charging electrode in a first deflection direction;
Second deflection means for deflecting ink particles charged by the second charging electrode in a second deflection direction;
Control means for controlling the charging voltage applied to the ink particles by the first and second charging electrodes based on the input character data to be printed, dot matrix, and printing control information including the number of stages,
The first and second deflection directions by the first and second deflection means are the same,
When each of the first and second nozzles prints matrix characters having the same number of vertical dots, the control means can control the width of the first charging voltage applied by the first charging electrode (maximum charging voltage and minimum charging voltage). The voltage of the charging voltage is controlled so that the width of the second charging voltage applied by the second charging electrode is different from that of the second charging electrode, and the character printed by the first nozzle and the second nozzle An inkjet recording apparatus characterized by adjusting a vertical interval between characters printed by the printer. And a charging voltage table for storing a combination of the first and second charging voltage values (including values of the maximum charging voltage and the minimum charging voltage) corresponding to the print control information,
The inkjet recording apparatus according to claim 1, wherein the control unit acquires a combination of the first and second charging voltages corresponding to the print control information from the charging voltage table. An inkjet recording apparatus that has first and second nozzles and prints dot-matrix characters in parallel on an object to be printed with ink particles ejected from the nozzles,
A first charging electrode for charging ink particles ejected from the first nozzle;
A second charging electrode for charging ink particles ejected from the second nozzle;
First deflection means for deflecting ink particles charged by the first charging electrode in a first deflection direction;
Second deflection means for deflecting ink particles charged by the second charging electrode in a second deflection direction;
Control means for controlling the charging voltage applied to the ink particles by the first and second charging electrodes based on the input character data to be printed, dot matrix, and printing control information including the number of stages,
The control means controls the same width of the charging voltage applied to the ink particles by the first and second charging electrodes,
The first and second deflection directions of the first and second deflection means are different, and the second deflection means is a second nozzle located on the lower side of the first and second nozzles. An ink jet recording apparatus characterized in that the ink particles ejected from the nozzle are deflected upward, and the first deflecting means deflects the ink particles ejected from the first nozzle located on the upper side downward.   The first and second deflecting means include a first deflecting electrode to which a predetermined voltage is applied and a second and third deflecting electrodes that are grounded, respectively, which are shared by the first and second deflecting means. Inkjet recording device.   The control means applies a charging voltage from the maximum charging voltage to the minimum charging voltage in order from the maximum charging voltage to the second charging electrode, so that the ink particles output from the second nozzle have the maximum character data to be printed. For the ink particles output from the first nozzle by charging from the lower dot to the highest dot in order and applying the charging voltage from the minimum charging voltage to the maximum charging voltage in order to the first charging electrode. 5. The ink jet recording apparatus according to claim 3, wherein charging is performed in order from the most significant dot to the least significant dot of the character data to be printed.   The control means applies a charging voltage from the minimum charging voltage to the maximum charging voltage in order from the minimum charging voltage to the second charging electrode, so that the ink particles output from the second nozzle are the maximum of the character data to be printed. Ink particles output from the first nozzle are charged in order from the upper dot to the lowest dot, and the charging voltage is applied to the first charging electrode from the maximum charging voltage to the minimum charging voltage in order. 5. The ink jet recording apparatus according to claim 3, wherein charging is performed in order from the lowest dot to the highest dot of the character data to be printed.

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