• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The ink ejection openings 4 1 to 4 9 are arranged at the pitch 2P in the main scanning direction, and the ink ejection openings 4 1 , 4 4 ,..., The ink ejection openings 4 2 , 4 5 , …) And the head 1 which is divided into three groups of the ink ejection openings 4 3 , 4 6 ,... And displaced by the pitch D in the sub-scanning direction, and the ink ejection openings 5 1 to 5 9 . Are arranged at intervals of pitch 2P in the main scanning direction, and each of the ink ejection openings 5 1 , 5 4 ,..., The ink ejection openings 5 2 , 5 5 ,... And the ink ejection openings 5 3 , 5 6 The heads 2 which are divided into three pairs of ..., and are displaced by the pitch D in the sub-scanning direction are fixed to the substrate 3 by displacing the ink ejection openings by the pitch P in the main scanning direction, and the ink ejection openings ( 41, ...) and the ink discharge ports (51, ...) when the distance in the sub-scan direction of the d, when the difference in the displacement amount of the distance d and an integer multiple of the 3D exceeding d / 2 Changing each set of ink ejection timing of the load (2) to be corrected so that the amount of displacement D / 2 or less.
    公开号:KR19990072880A
    申请号:KR1019990006024
    申请日:1999-02-24
    公开日:1999-09-27
    发明作者:구보타아츠시
    申请人:구보 마쯔오；도시바 테크 가부시키가이샤；
    IPC主号:
    专利说明:

    DRIVING METHOD FOR RECORDING HEAD}
    The present invention relates to a driving method of a recording head composed of a plurality of inkjet heads.
    As a printer using a recording head composed of a plurality of inkjet heads, for example, there is an inkjet color printer. It is provided with the inkjet head of each color of yellow, indigo blue, magenta, and black, and drives each inkjet head to perform full color printing. In such a recording head, color printing is performed by superimposing dots of yellow, indigo, and magenta colors, and therefore, precise management of the distance between the ink ejection openings of the inkjet heads for printing these colors is required.
    However, when the printing density becomes high resolution, it becomes difficult to exactly match the distance between the ink ejection openings of each head to an integer multiple of the pixel pitch. For example, at a print density of 300 dpi (dots / inch) to 600 dpi, the interval between the printing dots is about 40 µm to 80 µm, and in particular, due to the printing displacement between the dots due to mechanical displacement when each head is mounted. In addition, the deterioration of image quality due to periodic printing irregularities is remarkable. In order to solve this problem, it is good to increase the mechanical precision at the time of mounting each head, but this requires high precision in the head mounting member, and at the same time, the adjustment at the time of mounting is also complicated, high precision is required, and manufacturing becomes difficult. There is also a problem of being expensive in terms of cost.
    As a method of solving the printing displacement between dots, it is also known to correct the printing displacement between dots electrically by shifting the printing timing corresponding to the pitch corresponding to the mounting error between each inkjet head. For example, in the printing in the sub-scanning direction, which is the direction in which the printing medium moves, a plurality of clocks capable of selecting the printing start timing are prepared for each inkjet head, and the sub-scanning direction is selected by selecting the printing timing corresponding to the displacement of the printing pitch. Correct the factor displacement between dots. For example, if a clock four times the normal printing period is prepared, it is possible to electrically correct up to a quarter pitch displacement in the sub-scanning direction.
    It is also known to provide a delay circuit corresponding to the positional displacement for each of the printing lines, and to correct the printing position by shifting the printing timing by the delaying circuit. Furthermore, as described in Japanese Patent Application Laid-open No. Hei 7-156452, it is also known to achieve delay control and high image quality control using a buffer memory effectively.
    However, in preparing a plurality of clocks capable of selecting the print start timing for each inkjet head, there is a problem that the clock is required to be high in speed, resulting in complicated control and increased costs. In addition, in providing a delay circuit, there is a problem of complicated control. In addition, in the publication, a basic clock and a buffer memory having a frequency N times the maximum response frequency of the factor are prepared, and there is a problem that the driving frequency is increased, resulting in complicated control.
    SUMMARY OF THE INVENTION An object of the present invention is to provide a driving method of a recording head capable of correcting printing displacement between dots in the sub-scanning direction by simple control and also correcting printing displacement between dots in the main scanning direction by simple control. will be.
    BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram showing a recording head configuration of a first embodiment of the present invention.
    Fig. 2 is a perspective view of the recording head configuration shown in Fig. 1.
    FIG. 3 is a partial configuration diagram showing a relationship of arrangement of ink discharge ports of respective ink jet heads in the embodiment. FIG.
    4A to 4C are diagrams showing driving voltage waveforms in the same embodiment;
    Fig. 5 is a diagram showing printing dots by respective inkjet heads in the embodiment.
    6 (a) and 6 (b) show the displacement of the printing dot by each inkjet head and the printing dot after correction in the same embodiment;
    7 (a) and 7 (b) are diagrams showing the displacement of the printing dot by each inkjet head and the printing dot after correction in the same embodiment;
    Fig. 8 is a diagram showing a drive circuit of the inkjet head in the embodiment.
    9 (a) and 9 (b) are diagrams for explaining the method for detecting the displacement amount L in the embodiment;
    Fig. 10 is a diagram showing a driving circuit of the inkjet head in the second embodiment of the present invention.
    Fig. 11 is a diagram showing the arrangement of printing dot data in the embodiment.
    12A to 12F are diagrams showing a relationship between drive timing and print dot data in the embodiment.
    13A to 13F are diagrams showing a relationship between drive timing and print dot data in the embodiment.
    Fig. 14 is a partial configuration diagram showing the relationship of arrangement of ink discharge ports of respective ink jet heads in the third embodiment of the present invention.
    15A to 15E are diagrams showing driving voltage waveforms in the same embodiment.
    16A and 16B are diagrams showing the displacement of the printing dot by each inkjet head in the same embodiment and the printing dot after correction.
    Fig. 17 is a diagram showing a recording head structure according to the fourth embodiment of the present invention.
    Fig. 18 is a partial configuration diagram showing the relationship of arrangement of ink discharge ports of respective ink jet heads in the embodiment.
    19A and 19B are diagrams showing the displacement of the printing dot by each inkjet head and the printing dot after correction in the same embodiment;
    20 is a diagram showing a recording head structure according to the fifth embodiment of the present invention;
    Fig. 21 is a partial configuration diagram showing the relationship of arrangement of ink discharge ports of respective ink jet heads in the embodiment.
    Fig. 22 is a diagram showing a recording head structure according to the sixth embodiment of the present invention.
    Fig. 23 is a partial configuration diagram showing a relationship of arrangement of ink discharge ports of respective ink jet heads in the embodiment.
    Fig. 24 is a diagram showing a recording head structure according to the seventh embodiment of the present invention.
    25 (a) and 25 (b) are diagrams showing an example of the configuration of an inkjet head used in each embodiment.
    26A and 26B are diagrams showing another example of the configuration of the inkjet head used in each embodiment.
    27A and 27B are diagrams illustrating another example of the configuration of the inkjet head used in each embodiment.
    28 is a diagram showing another example of zigzag arrangement.
    According to the invention described in claim 1, the plurality of inkjet heads arranged with a plurality of ink chambers provided with ink ejection openings are parallel to the main scanning direction orthogonal to the moving direction of the recording medium relatively moving with respect to the head. In the recording heads spaced apart by a predetermined distance in the sub-scan direction, which is the moving direction of the recording medium, the ink chambers of the ink jet heads are divided into N sets of N-1 (where N≥2 integer), respectively. The ink ejection openings of the ink chamber are zigzagly arranged between the respective tanks, and the ink chambers are sequentially driven in time divisions at predetermined timings in units of groups, and ink ejection from the ink ejection openings of the ink chambers of one group of the inkjet head as a reference and The displacement of the dot in the sub-scanning direction due to the ink ejection from the ink ejection opening of the ink chamber of each set of inkjet heads other than the inkjet head serving as a reference is careless. When the dot pitch in the direction exceeds 1/2, the ink ejection order from the ink ejection openings of the ink chambers of the respective ink jet heads is changed to correct the displacement of the dot to 1/2 or less of the dot pitch in the sub-scan direction. .
    According to the invention described in claim 1, the factor displacement between dots in the sub-scanning direction can be corrected by simple control.
    EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described with reference to drawings.
    As shown in Fig. 1, the inkjet heads 1 and 2 on which a plurality of ink chambers are arranged are fixed on each side of the substrate 3 on which both surfaces are parallel by, for example, an adhesive or the like to form one recording head.
    The inkjet heads 1 and 2 and the board | substrate 3 shown in FIG. 1 have the structure as shown to the perspective view of FIG.
    That is, the inkjet heads 1 and 2 in which a plurality of ink chambers are arranged on both sides of the substrate 3 are fixed.
    Ink supply pipes 1a and 2a are connected to the inkjet heads 1 and 2, respectively.
    In addition, connectors 1b and 2b are respectively provided in part of the inkjet heads 1 and 2, respectively. Cables 1c and 2c are connected to these connectors 1b and 2b, respectively. The drive voltage is output to the inkjet heads 1 and 2 via these cables 1c and 2c. P is a paper which is a recording medium.
    Although each of the inkjet heads 1 and 2 is provided with ink ejection openings 4 1 to 4 9 ,..., 5 1 to 5 9 ,..., Corresponding to the respective ink chambers as shown in FIG. The discharge ports 4 1 to 4 9 ,..., 5 1 to 5 9 ,... Are arranged in a zigzag manner. That is, each of the ink ejection openings 4 1 to 4 9 ,... Of the ink jet head 1 is arranged at intervals of pitch 2P in the main scanning direction orthogonal to the moving direction of the recording medium indicated by the arrow in the figure.
    Moreover, this inkjet head 1 divides each ink chamber into three groups of two. That is, the ink ejection orifice (41, 44, 47, ...) to one twos, and the ink discharge port (42, 45, 48, ...) for, while the other one twos, ink discharge ports (4, 3, 4 6 , 4 9 , ...) is another one pair. Then, the ink ejection openings 4 1 , 4 4 , 4 7 ,... Of the ink chamber of one set as a reference are arranged on the line 1a, and the ink ejection openings 4 2 , 4 5 of the other ink chambers are arranged. , 4 8 ,... Are arranged on the line 1b displaced from the line 1a by a predetermined pitch D in the sub-scan direction, which is the moving direction of the recording medium, and an ink discharge port of another set of ink chambers. (4 3 , 4 6 , 4 9 ,...) Are arranged on the line 1c further displaced from the line 1b by a predetermined pitch D in the sub-scanning direction.
    The inkjet head 2 also divides each ink chamber into three sets of two. That is, the ink ejection orifice (51, 54, 57, ...) to one twos, and the ink discharge port (52, 55, 58, ...) for, while the other one twos, ink discharge ports (53, 5 6 , 5 9 ,…) making another one pair.
    Each of the ink ejection openings 5 1 to 5 9 ,... Of the inkjet head 2 is displaced by the pitch P in the main scanning direction from the respective ink ejection openings 4 1 to 4 9 ,. Moreover, between each ink discharge ports 5 1 to 5 9 ,... Are arranged at intervals of pitch 2P in the main scanning direction. Then, the ink ejection openings 5 1 , 5 4 , 5 7 ,... Of one set of ink chambers are arranged on a line 2a spaced apart from the line 1a as a reference in the sub-scanning direction by a distance d, The ink ejection openings 5 2 , 5 5 , 5 8 ,... Of the other one set of ink chambers are arranged on the line 2b displaced from the line 2a by a predetermined pitch D in the sub-scanning direction. The ink ejection openings 5 3 , 5 6 , 5 9 ,... Of another set of ink chambers are arranged on the line 2c displaced from the line 2b by a predetermined pitch D in the sub-scanning direction. .
    Each of the inkjet heads 1, 2 is configured to drive in three divisions by applying a driving voltage waveform to each ink chamber at the timing shown in FIG. That is, the inkjet head 1 discharges ink from the ink discharge ports 4 1 , 4 4 , 4 7 ,... On the line 1a at the timing of FIG. 4A, and the timing of FIG. 4B. In the ink ejection openings 4 2 , 4 5 , 4 8 ,... On the line 1b, ink ejection openings 4 3 , 4 6 , 4 on the line 1c at the timing of FIG. Ink discharge from 9 ,. Further, the inkjet head 2 discharges ink from the ink discharge ports 5 1 , 5 4 , 5 7 ,... On the line 2a at the timing of FIG. 4A, and the timing of FIG. 4B. Ink is discharged from the ink discharge ports 5 2 , 5 5 , 5 8 ,... On the line 2b at, and the ink discharge ports 5 3 , 5 6 , 5 on the line 2c at the timing of FIG. Ink discharge from 9 ,.
    Therefore, when one line is printed using this head, the dots n1, n2, n3, n4, ... shown in FIG. 5 are printed by three division driving of the inkjet head 1, and the inkjet head ( By the three-division driving of 2), the dots m1, m2, m3, m4, ... shown in Fig. 5 are printed, and one line can be printed with the dot pitch P in the main scanning direction as a whole. That is, the dot pitch in the main scanning direction of each of the inkjet heads 1 and 2 is 2P, but printing is possible at this double resolution.
    Here, when the interval d between the lines 1a and 2a of each of the inkjet heads 1 and 2 is d = n3D (where n> 0 is an integer), the application timing of the driving voltage waveform shown in FIG. 4 is negative. Since it is determined based on the pitch D in the scanning direction, the dot line of the inkjet head 2 can be superimposed on the dot line of the inkjet head 1, but there is no problem, but the thickness of the substrate 3, the thickness of the adhesive, and the like Due to the difference, the displacement actually occurs in the dot line of the inkjet head 1 and the dot line of the inkjet head 2.
    This displacement is classified into three types of the following expressions (1) to (3).

    When the displacement amount d-n3D is in the range of the expression (1), since it is a normal error range recognized in the case of dot printing by the inkjet head alone, the printing is performed at the same timing. However, in the case where the displacement amount d-n3D is in the range of the equation (2) or (3), the correction is necessary because it exceeds the normal error range.
    For example, when the displacement amount is in the range of the equation (2), as shown in Fig. 6A, the dots n1, n2, n3, n4, ... of the inkjet head 1 and the dots of the inkjet head 2 are shown. Steps occur at (m1, m2, m3, m4, ...).
    In order to correct this step, the ink ejection openings 4 1 , 4 4 , 4 7 ,... On the line 1a of the inkjet head 1 and the ink ejection openings 5 2 , on the line 2b of the inkjet head 2 . The ink ejection operation from 5 5 , 5 8 ,... Is performed at the timing of FIG. 4A, and the ink ejection openings 4 2 , 4 5 , 4 8 ,... On the line 1b of the inkjet head 1. And ink ejection operation from the ink ejection openings 5 3 , 5 6 , 5 9 ,... On the line 2c of the inkjet head 2 at the timing of FIG. 4B, and the line of the inkjet head 1. Ink ejection operations from the ink ejection openings 4 3 , 4 6 , 4 9 ,..., On (1c) and the ink ejection openings 5 1 , 5 4 , 5 7 ,... On the line 2a of the inkjet head 2; It performs at the timing of FIG.4 (c). That is, the timing of the ink ejection operation from the ink ejection openings on the lines 2a to 2c of the inkjet head 2 is changed. By performing such control, the amount of displacement between the dots n1, n2, n3, n4, ... of the inkjet head 1 and the dots m1, m2, m3, m4, ... of the inkjet head 2 is shown in FIG. Is modified as shown in
    In the case where the displacement amount is in the range of the equation (3), as shown in Fig. 7A, the dots n1, n2, n3, n4, ... of the inkjet head 1 and the dots of the inkjet head 2 are shown. Larger step occurs at (m1, m2, m3, m4, ...).
    In order to correct this step, the ink ejection openings 4 1 , 4 4 , 4 7 ,... On the line 1a of the inkjet head 1 and the ink ejection openings 5 3 , on the line 2c of the inkjet head 2. Ink ejection operations from 5 6 , 5 9 ,... Are performed at the timing of FIG. 4A, and ink ejection openings 4 2 , 4 5 , 4 8 ,..., On the line 1b of the inkjet head 1. And ink ejection operation from the ink ejection openings 5 1 , 5 4 , 5 7 ,... On the line 2a of the inkjet head 2 at the timing of FIG. 4B, and the line of the inkjet head 1. The ink ejection operation from the ink ejection openings 4 3 , 4 6 , 4 9 ,..., On (1c) and the ink ejection openings 5 2 , 5 5 , 5 8 ,... On the line 2b of the inkjet head 2; It performs at the timing of FIG.4 (c). That is, the timing of the ink ejection operation from the ink ejection openings on the lines 2a to 2c of the inkjet head 2 is changed. By performing such control, the amount of displacement between the dots n1, n2, n3, n4, ... of the inkjet head 1 and the dots m1, m2, m3, m4, ... of the inkjet head 2 is shown in FIG. Is modified as shown in
    The driving of the head which can change the timing of such ink ejection operation can be realized by the driving circuit shown in FIG.
    The driving circuit includes an electrode for applying a voltage to each of the ink chambers 11 1 , 11 2 , 11 3 , 11 4 , 11 5 , 11 6 ,... Of the inkjet head 1 and an analog switch 12 1 , 12. 2 , 12 3 , 12 4 , 12 5 , 12 6 ,…). In addition, an electrode for applying a voltage to the ink chambers 11 1 , 11 4 ,... Where the ink ejection openings 4 1 , 4 4 ,... On the line 1a of the inkjet head 1 is provided is an analog switch ( Ink chambers 112 and 115 connected to the line 31 via 13 1 , 13 4 ,..., And provided with ink ejection openings 4 2 , 4 5 ,... On the line 1b of the inkjet head 1. An electrode for applying a voltage to the line 32 is connected to the line 32 through analog switches 13 2 , 13 5 ,..., And an ink discharge port 4 3 , on the line 1c of the inkjet head 1. 46, ...) are connected to the electrodes for applying a voltage to the installed ink chamber (11 3, 11 6, ...) in the line 33 through the analog switches (13 3, 13 6, ...).
    In addition, an electrode for applying a voltage to each of the ink chambers 21 1 , 21 2 , 21 3 , 21 4 , 21 5 ,... Of the inkjet head 2 is provided with an analog switch 22 1 , 22 2 , 22 3 ,. Grounding via 22 4 , 22 5 ,…). In addition, an electrode for applying a voltage to the ink chambers 21 1 , 21 4 ,... Where the ink ejection openings 5 1 , 5 4 ,... On the line 2a of the inkjet head 2 is provided is an analog switch ( Ink chambers 21 2 , which are connected to the line 34 via 23 1 , 23 4 ,..., And are provided with ink ejection openings 5 2 , 5 5 ,... On the line 2b of the inkjet head 2 . An electrode for applying a voltage to 21 5 ,... Is connected to the line 35 via analog switches 23 2 , 23 5 ,..., And an ink discharge port 5 on a line 2c of the inkjet head 2. 3, an electrode for applying a voltage ...), an ink chamber (21, 3, installed ...) is connected to the line 36 through the analog switch (23, 3, ...).
    The line 31 is connected to the waveform generating circuit 37 for generating the drive voltage waveform shown in Fig. 4A, and at the same time, the first terminals 40a, 41a, 42a of the selectors 40, 41, 42 are selected. ), Respectively. The second terminal 40b, 41b, of the selector 40, 41, 42 is connected at the same time as the line 32 is connected to the waveform generating circuit 38 for generating the drive voltage waveform shown in Fig. 4B. 42b), respectively. The third terminal 40c, 41c, of the selector 40, 41, 42 is connected at the same time as the line 33 is connected to the waveform generating circuit 39 for generating the drive voltage waveform shown in Fig. 4C. 42c), respectively.
    The line 34 is connected to the common terminal of the selector 40, the line 35 is connected to the common terminal of the selector 41, and the line 36 is connected to the common terminal of the selector 42. You are connected to.
    This head drive circuit is configured as an analog switch 12 1 , 12 2 , 12 3 , 12 4 , 12 5 , 12 6 ,..., Or an analog switch 22 1 , 22 based on the print data from the print data output circuit 43. 2 , 22 3 , 22 4 , 22 5 ,... And selectively on-drive each ink chamber 11 1 , 11 2 , 11 3 , 11 4 , 11 5 , 11 6 ,... Or ink chamber 21 1 , Selectively ground the electrodes of 21 2 , 21 3 , 21 4 , 21 5 ,…, or analog switches 13 1 , 13 2 , 13 3 , 13 4 , 13 5 , 13 6 ,. (23 1 , 23 2 , 23 3 , 23 4 , 23 5 ,...) Selectively warms up each ink chamber 11 1 , 11 2 , 11 3 , 11 4 , 11 5 , 11 6 ,... Or ink The drive voltage waveforms of FIGS. 4A, 4B, or 4C are selectively applied to the electrodes of the seals 21 1 , 21 2 , 21 3 , 21 4 , 21 5 ,..., And the analog switches 13 1 , 13 2 , 13 3 , 13 4 , 13 5 , 13 6 ,…) or analog switches 23 1 , 23 2 , 23 3 , 23 4 , 23 5 ,… The ink is discharged from the ink discharge port of the corresponding ink chamber when the drive is turned on.
    Control to selectively apply the driving voltage waveforms of Figs. 4A, 4B, and 4C is performed by the selectors 40, 41, and 42, respectively. That is, when the displacement amount d-n3D is within the range of the equation (1), the selector 40 selects the driving voltage waveform from the waveform generating circuit 37 and supplies it to the line 34, and the selector 41 The driving voltage waveform from the waveform generating circuit 38 is selected and supplied to the line 35, and the selector 42 selects and supplies the driving voltage waveform from the waveform generating circuit 39 to the line 36.
    In addition, when the displacement amount d-n3D is within the range of equation (2), the selector 40 selects the driving voltage waveform from the waveform generating circuit 38 and supplies it to the line 34, and the selector 41 The driving voltage waveform from the waveform generating circuit 39 is selected and supplied to the line 35, and the selector 42 selects and supplies the driving voltage waveform from the waveform generating circuit 37 to the line 36.
    In addition, when the displacement amount d-n3D is in the range of equation (3), the selector 40 selects the driving voltage waveform from the waveform generating circuit 39 and supplies it to the line 34, and the selector 41 The driving voltage waveform from the waveform generating circuit 37 is selected and supplied to the line 35, and the selector 42 selects and supplies the driving voltage waveform from the waveform generating circuit 38 to the line 36.
    By performing such control, the displacement of the dots in the sub-scanning direction between the inkjet heads 1 and 2 can be corrected, whereby the displacement of the dots in the sub-scanning direction can be made extremely small. It is possible.
    Here, as a detection method of the displacement amount d-n3D, printing is carried out by the specific pattern for irradiation, for example as shown to Fig.9 (a), and the printing result is observed with a microscope. As a result, the distance L between the dots n1, n2, ... printed by the inkjet head 1 and the dots m1, m2, ... printed by the inkjet head 2 is measured.
    Further, as shown in Fig. 9B, a specific pattern for irradiation with a predetermined interval is printed, and the distance L between dots (m1, m2, ...) printed by the inkjet head 2 and the specific pattern L are shown. May be measured.
    Next, a second embodiment of the present invention will be described with reference to FIGS. 10 to 13.
    In addition, the same code | symbol is attached | subjected to the same part as 1st Embodiment, and another part is demonstrated.
    As shown in Fig. 10, the programmable waveform generating circuits 51, 52, 53, 54 in place of the waveform generating circuits 37, 38, 39 and the selectors 40, 41, 42 in the first embodiment. , 55, 56 to supply the driving voltage waveform from the programmable waveform generating circuit 51 to the analog switches 13 1 , 13 4 ,..., And driving from the programmable waveform generating circuit 52. Supply voltage waveforms to analog switches 13 2 , 13 5 ,..., And drive voltage waveforms from the programmable waveform generation circuit 53 to analog switches 13 3 , 13 6 ,. The driving voltage waveform from the capable waveform generating circuit 54 is supplied to the analog switches 23 1 , 23 4 ..., And the driving voltage waveform from the programmable waveform generating circuit 55 is supplied to the analog switches 23 2 , 23. 5, ...) supplied to, and the programmable waveform A drive voltage waveform from the production circuit 56 is supplied to the analog switch (23, 3, ...).
    In this embodiment, the timing of the drive voltage waveforms from the programmable waveform generation circuits 51 to 56 changes depending on the relationship of the above-described equations (1), (2) and (3) in the displacement amount d-n3D. Set in advance so that
    In addition, the measurement of this displacement amount is the same as when demonstrated with reference to FIG.9 (a) and FIG.9 (b).
    Fig. 11 shows the arrangement of the print dot data, d11, d21, d31, d41, d51, d13, d23, d33, d43, d53,... , d15, d25, d35, d45, d55,... Prints to the inkjet head 1, and d12, d22, d32, d42, d52. … , d14, d24, d34, d44, d54,... , d16, d26, d36, d46, d56,... Prints to the inkjet head 2.
    In this factor, when the displacement amount (d-n3D) in the sub-scanning direction of the dot printed by the inkjet head 1 and the dot printed by the inkjet head 2 is, for example, in the relation of the above expression (2), the inkjet In the head 1, the ink chambers 11 1 , 11 4 , ... are driven by the drive voltage waveform shown in Fig. 12A, and the print dot data at this time is shown in Fig. 12D. D11, d21, d31,... The ink chambers 11 2 , 11 5 ,... Are driven by the drive voltage waveforms shown in FIG. 12B, and the print dot data at this time is shown in FIG. 12E. d13, d23,... In addition, the ink chambers 11 3 , 11 6 ,... Are driven by the drive voltage waveforms shown in FIG. 12C, and the print dot data at this time is as shown in FIG. 12F. As d15, d25,… Becomes
    On the other hand, in the inkjet head 2, the ink chambers 21 2 , 21 5 , ... are driven by the drive voltage waveform shown in Fig. 13A, and the print dot data at this time is As shown in (e), d14, d24, d34,... In addition, the ink chambers 21 3 ,... Are driven by the drive voltage waveform shown in FIG. 13B, and the print dot data at this time is d26, as shown in FIG. 13F. d36,... In addition, the ink chambers 21 1 , 21 4 ,... Are driven by the driving voltage waveform shown in FIG. 13C, and the print dot data at this time is as shown in FIG. 13D. As d12, d22, d32,… Becomes
    By such control, it is possible to correct the case where the displacement amount d-n3D in the sub-scanning direction is in the relation of the above expression (2). Similarly, correction is possible even when the displacement amount d-n3D in the sub-scanning direction is in the relation of the above expression (3). Therefore, also in this embodiment, similarly to the first embodiment, the displacement of the dots in the sub-scanning direction between the inkjet heads 1 and 2 can be corrected, the displacement of the dots in the sub-scanning direction is extremely small, and the quality is high. High resolution printing is possible.
    Next, a third embodiment of the present invention will be described with reference to FIGS. 14 to 16.
    As shown in Fig. 14, the inkjet heads 61 and 62 in which a plurality of ink chambers are arranged are fixed on each side of the substrate 63 on which both surfaces are parallel by, for example, an adhesive or the like to form one recording head. .
    Wherein each ink-jet head (61, 62) has ink discharge ports corresponding to each ink chamber (64 1-64 10, ..., 65 1-65 9, ...) installation, although these ink discharge ports (64 1 ~64 to 10, …, 65 1 to 65 9 are arranged in a zigzag manner.
    That is, the ink jet head 61 arranges the ink discharge ports 64 1 to 64 10 ... At intervals of pitch 2P in the main scanning direction orthogonal to the moving direction of the recording medium indicated by the arrows in the figure. Each ink chamber is divided into five groups of four. That is, the ink discharge port (64 1, 64 6, ...) to one twos, and the ink discharge port (64 2, 64 7, ...) for, while the other one twos, the ink discharge port (64 3, 64 8, ...) other the One group is used, and the ink ejection openings 64 4 , 64 9 ,... Are the other, and the ink ejection openings 64 5 , 64 10 ... Then, the ink ejection openings 64 1 , 64 6 ,... Of one set of ink chambers as a reference are arranged on the line 1d, and the ink ejection openings 64 2 , 64 7 ,. On the line 1e displaced from the line 1d by a predetermined pitch D in the sub-scanning direction, which is the moving direction of the recording medium, and the ink discharge ports 64 3 , 64 8 , ...) is placed on the line 1f displaced from the line 1e by a predetermined pitch D in the sub-scanning direction, and the ink discharge ports 64 4 , 64 9 ,. The line 1f is disposed on the line 1g displaced by a predetermined pitch D in the sub-scanning direction, and the ink discharge ports 64 5 , 64 10 ,... Of the remaining one set of ink chambers are line 1g. Is arranged on the line 1h displaced by a predetermined pitch D in the sub-scanning direction.
    Further, the inkjet head 62 displaces the respective ink ejection openings 65 1 to 65 9 ... With a pitch P in the main scanning direction with respect to the respective ink ejection openings 64 1 to 64 9 ,... Of the inkjet head 61. In addition, each of the ink ejection openings 65 1 to 65 9 is arranged at intervals of pitch 2P in the main scanning direction orthogonal to the moving direction of the recording medium indicated by the arrows in the figure. Each ink chamber is divided into five groups of four. That is, the ink discharge port (65 1, 65 6, ...) to one twos, and the ink discharge port (65 2, 65 7, ...) for, while the other one twos, the ink discharge port (65 3, 65 8, ...) other the One group is used, and the ink ejection openings 65 4 , 65 9 ,... Are the other, and the ink ejection openings 65 5 ,. Then, the ink ejection openings 65 1 , 65 6 ,... Of one set of ink chambers are arranged on the line 2d spaced apart by the distance d in the sub-scanning direction from the line 1d as a reference, and the other one The ink ejection openings 65 2 , 65 7 ,... Of the ink chambers of the tank are disposed on the line 2e displaced from the line 2d by a predetermined pitch D in the sub-scanning direction, and the The ink ejection openings 65 3 , 65 8 are arranged on the line 2f displaced from the line 2e in a sub-scanning direction by a predetermined pitch D, and the ink ejection openings 65 4 ,. 65 9 ,... Are arranged on a line 2g displaced from the line 2f by a predetermined pitch D in the sub-scanning direction, and the ink ejection openings 65 5 ,. The line 2g is disposed on the line 2h displaced by a predetermined pitch D in the sub-scanning direction.
    Each of the inkjet heads 61 and 62 applies five driving voltage waveforms to the electrodes of the respective ink chambers at the timing shown in FIG. 15, and performs five division driving. The line of the inkjet head 61 at the timing of FIG. Ink discharge ports 64 1 , 64 6 ,... On (1d) and ink discharge ports 65 1 , 65 6 ,... On line 2d of inkjet head 62 are discharged. Ink from the ink ejection openings 64 2 , 64 7 ... On the line 1e of the inkjet head 61 and the ink ejection openings 65 2 , 65 7 ,... On the line 2e of the inkjet head 62 at the timing of. The ink ejection openings 64 3 , 64 8 ,... On the line 1f of the inkjet head 61 and the ink ejection openings on the line 2f of the inkjet head 62 are discharged at the timing of FIG. 15C. 65 3, 65 8, ...), the ink discharge a walk, Fig. 15 (d) the timing on the ink discharge port (64 4, 64 9 of the line (1g) of the ink jet head 61, of from ...) and an ink jet head (62 On line (2 g) Ink ejection from the ink ejection openings 65 4 , 65 9 ,..., Ink ejection openings 64 5 , 64 10 ,..., On the line 1h of the inkjet head 61 at the timing of FIG. The ink is ejected from the ink ejection openings 65 5 on the line 2h of the ink jet head 62.
    Therefore, when one line printing is performed using this head, the dots n1, n2, n3, n4, ... are printed in the same manner as in FIG. 5 by five division driving of the inkjet head 61, and the inkjet head 62 Dot (m1, m2, m3, m4, ...) is printed by five division drive of one, and one line can be printed by dot pitch P in the main scanning direction as a whole. That is, the dot pitch in the main scanning direction of each of the inkjet heads 61 and 62 is 2P, but printing is possible at this double resolution.
    Here, when the interval d between the lines 1d and 2d of each of the inkjet heads 61 and 62 is d = n5D (where n 1), the application timing of the driving voltage waveform shown in Fig. 15 is sub-scanning. Since it is determined based on the pitch D in the direction, there is no problem because the dot line of the inkjet head 62 can be superimposed on the dot line of the inkjet head 61, but there is no problem. Due to the difference, the displacement actually occurs in the dot line of the ink jet head 61 and the dot line of the ink jet head 62.
    As shown in Fig. 16A, the amount of displacement between the dots n1, n2, n3, ... of the inkjet head 61 and the dots m1, m2, m3, ... of the inkjet head 62 is subscanned. In the case where the dot pitch in the direction exceeds 1/2, the same control as in the above-described embodiment is carried out, and the dots n1, n2, n3, ... of the inkjet head 61 and the dots m1, m2 of the inkjet head 62 are performed. , m3, ...) is corrected to 1/2 or less of the dot pitch in the sub-scan direction.
    In this case, since the one-dot pitch in the sub-scanning direction can be further subdivided and controlled as compared with the zigzag arrangement of three ink ejection openings of the above-described embodiment, the adjustment of the printing position accuracy can be improved. On the other hand, since the driving is divided into five to print one line, the printing speed is lower than that of the three-division driving.
    Therefore, it may be selected according to the printing purpose from the relationship between the printing speed and the printing position precision whether the ink ejection openings are zigzag arranged three by three or the five ejection openings are arranged zigzag.
    Next, a fourth embodiment of the present invention will be described with reference to FIGS. 17 to 19.
    In Fig. 17, 71, 72, and 73 are inkjet heads for discharging indigo ink, inkjet heads for discharging magenta ink, and inkjet heads for discharging yellow ink, respectively, and the indigo inkjet head 71 and magenta inkjet head ( 72 is fixed on each side of the substrate 74 in which both surfaces are parallel, for example, by an adhesive or the like, and the magenta inkjet head 72 and the yellow inkjet head 73 are formed on each side of the substrate 75 in which both surfaces are parallel. As described above, one color recording head is formed by fixing with an adhesive or the like.
    Wherein each ink-jet head (71, 72, 73), as shown in Figure 18, corresponding to each ink chamber by the ink ejection orifice (76 1 ~76 9, ..., 77 1-77 9, ..., 78 1-78 9 , ...) the installation, these ink discharge ports (76 1 ~76 9, ..., but, 77. 1-77. 9, ..., 78. 1-78. 9, a ...) are arranged three each in a zigzag pattern. That is, each of the ink ejection openings 76 1 to 76 9 ,... Of the ink jet head 71 are arranged at intervals of the pitch P in the main scanning direction orthogonal to the moving direction of the recording medium indicated by the arrow in the figure.
    The inkjet head 71 divides each ink chamber into three sets of two. That is, the ink discharge port (76 1, 76 4, 76 7, ...) one twos and and another one twos ink discharge port (762, 765, 768, ...), the ink discharge port (76 3, 76 6, 76 9 ,… making another one pair. Then, the ink ejection openings 76 1 , 76 4 , 76 7 ,... Of one set of ink chambers serving as a reference are arranged on the line ca, and the ink ejection openings 76 2 , 76 5 of the other set of ink chambers. , 76 8 ,... Are arranged on a line cb displaced from the line ca by a predetermined pitch D in the sub-scan direction, which is the moving direction of the recording medium, and an ink discharge port of another set of ink chambers. (76 3 , 76 6 , 76 9 ,...) Are arranged on the line cc further displaced from the line cb by a predetermined pitch D in the sub-scanning direction.
    The inkjet head 72 also divides each ink chamber into three groups of two. That is, the ink discharge port (77 1, 77 4, 77 7, ...) one twos, and the ink discharge port (77 2, 77 5, 77 8, ...) for, while the other one twos, the ink discharge port (77 3, 77 6 , 77 9 ,…) making another one pair.
    The inkjet head 72 of each ink discharge port (77 1-77 9, ...) of the main scanning direction arranged at an interval of pitch P, and each of the ink discharge port (77 1-77 9, ...) and the inkjet head 71 each ink ejecting opening of the (76 1 ~76 9, ...) are arranged by matching the position of the main scanning direction. Then, the ink ejection openings 77 1 , 77 4 , 77 7 ,... Of one set of ink chambers are disposed on a line ma spaced apart by the distance d1 from the line ca as a reference in the sub-scanning direction, Ink ejection openings 77 2 , 77 5 , 77 8 ,... Of the other one set of ink chambers are arranged on a line mb displaced from the line ma by a predetermined pitch D in the sub-scanning direction; are disposed on a line (mc) displaced by D a predetermined pitch in the even sub-scanning direction and the other one set of the ink ejection orifice of the ink chamber (77 3, 77 6, 77 9, ...) the line (mb) .
    The ink jet heads 73 each of the ink ejection openings 78 1 to 78 9 ,... Are arranged at intervals of the pitch P in the main scanning direction, and each of the ink ejection openings 78 1 to 78 9 ,. each ink ejecting opening of the (76 1 ~76 9, ...) are disposed to match the position of the main scanning direction. Then, the ink ejection openings 78 1 , 78 4 , 78 7 ,... Of one set of ink chambers are disposed on a line ya spaced apart from the line ca as a reference in the sub-scanning direction by a distance d2, The ink ejection openings 78 2 , 78 5 , 78 8 ,... Of the other one set of ink chambers are arranged on a line yb displaced from the line ya in a sub-scan direction by a predetermined pitch D, and The ink ejection openings 78 3 , 78 6 , 78 9 ,... Of another set of ink chambers are arranged on the line yc displaced by the predetermined pitch D in the sub-scanning direction further from the line yb. .
    Each of the inkjet heads 71, 72, 73 is driven in three divisions by applying a driving voltage waveform to each of the ink chambers at the timing shown in FIG. 4 as in the first embodiment described above. Ink ejection openings 76 1 , 76 4 , 76 7 ,... On the line ca of the inkjet head 71 at the timing, ink ejection openings 77 1 , 77 4 , 77 7 on the line ma of the inkjet head 72. , ...) and ink ejection from the ink ejection openings 78 1 , 78 4 , 78 7 ,... On the line ya of the inkjet head 73, and the inkjet head 71 at the timing of FIG. 4B. Ink ejection openings 76 2 , 76 5 , 76 8 ,... On the line cb, ink ejection openings 77 2 , 77 5 , 77 8 ,..., And inkjet head 73 on the lines mb of the inkjet head 72. Ink ejection from the ink ejection openings 78 2 , 78 5 , 78 8 ,... On the line yb, and at the timing of FIG. 4C, the ink ejection openings on the line cc of the inkjet head 71. 76 3, 76 6, 76 9, ...), the inkjet head 72 The ink discharge port (77 3, 77 6, 77 9, ...) of the line (mc) and the ink ejection orifice of the line (yc) of the ink jet head (73) (78 3, 78 6, 78 9, ...) to the ink discharge from It is supposed to be.
    Therefore, when one line printing is performed using this head, first, the inkjet head 71 is driven by three divisions to print dots, and then the inkjet head 72 is driven by three divisions and the inkjet head 71 is driven by the inkjet head 71. The dots are selectively superimposed on the printing dots, and the inkjet head 73 is driven in three divisions to selectively overlap the dots on the printing dots by the inkjet heads 71 and 72 to print. In this way, the indigo, magenta, and yellow three-color dots are individually or superimposed to print the color.
    By the way, when printing the indigo blue, magenta, and yellow dots by overlapping, the interval d1 between the line ca of the indigo inkjet head 71 and the line ma of the magenta inkjet head 72 is d1 = n3D (where n≥1), if the distance d2 between the line ca of the blue inkjet head 71 and the line ya of the yellow inkjet head 73 is d2 = n'3D (where n'≥1) Since the application timing of the driving voltage waveform shown in FIG. 4 is determined based on the pitch D in the sub-scanning direction, the printing dots of the inkjet heads 72 and 73 are precisely placed on the printing dots of the inkjet head 71. Although there is no problem because it may overlap, the printing pattern of indigo blue by the inkjet head 71 and the magenta printing dot by the inkjet head 72 are actually changed due to differences in the thickness of the substrates 74 and 75, the thickness of the adhesive, and the like. The displacement occurs between the yellow printing dots by the inkjet head 73. That is, dot displacement as shown to Fig.19 (a) arises.
    Here, the displacement of a dot is measured by the method similar to the method demonstrated by FIG. 9 (a) and (b) of 1st Embodiment.
    In this case, therefore, the ink ejection order of each line ma, mb, mc of the inkjet head 72 is changed, or the ink ejection order of each line ya, yb, yc of the inkjet head 73 is changed. By adjusting the dot position in the sub-scanning direction as in the first embodiment, the dot displacement is corrected. Thereby, printing dots by the inkjet heads 71 to 73 of indigo blue, magenta, and yellow can be superimposed precisely as shown in Fig. 19B, and high quality color printing is possible.
    Next, a fifth embodiment of the present invention will be described with reference to FIGS. 20 and 21.
    As shown in Figure 20, and the ink discharge port n of the ink-jet head (81 1 ~81 n) by arranging the plurality of ink chambers installed on both sides are alternately arranged in a zigzag to each side of the parallel board 82, The long line recording head is formed by fixing with an adhesive or the like. Then, the line recording head is arranged in the main scanning direction orthogonal to the moving direction of the recording medium, and printing is performed in units of one line to the moving recording medium.
    This line recording head is the same as the inkjet heads 1 and 2 shown in the first embodiment, and each inkjet head 81 1 to 81 n is zigzag arranged in three ink ejection openings as shown in FIG. Each ink chamber is divided into three groups of two. In such a line recording head, for example, it disposed on the same side of the substrate 82 a of the ink-jet head (81 1) of the ink discharge port 84 of the position and the ink jet head (81 3) in the sub-scan direction of the ink discharge port 83 is part The positional displacement of Δd may occur at a position in the scanning direction.
    In such a case, it is possible to correct the positional displacement of the sub-scan direction by varying for the ink ejection timing of each set of ink ejection orifices of the ink jet head (81 3) to an ink ejection timing of the ink discharge ports, each set of the ink jet head (81 1) have. That is, the discharge timing of the ink is changed by changing the selection order of the drive voltage waveforms shown in Figs. 4A, 4B, and 4C as in the first embodiment described above, and the positional displacement in the sub-scanning direction is changed. Calibrate The positional displacement in the sub-scanning direction of the ink discharge port between the ink jet head 811 disposed on one side of the substrate 82 and the ink jet head 812 disposed on the other side is controlled in the same manner as in the first embodiment. You can correct it.
    Next, a sixth embodiment of the present invention will be described with reference to FIGS. 22 and 23.
    As shown in Fig. 22, n inkjet heads 85 1 to 85 n in which a plurality of ink chambers provided with ink ejection openings are arranged are arranged in succession on the same surface of the substrate 86, and an adhesive or the like is disposed. And a long line recording head is formed. Then, the line recording head is arranged in the main scanning direction orthogonal to the moving direction of the recording medium, and printing is performed in units of one line to the moving recording medium.
    This line recording head is the same as the ink jet heads 1 and 2 shown in the first embodiment, and each ink jet head 85 1 to 85 n is zigzag arranged in three ink ejection openings as shown in FIG. Each ink chamber is divided into three groups of two. In such a line recording head, for example, a positional displacement of Δd at a position in the sub scanning direction of the ink ejection opening 86 of the ink jet head 85 1 and a position in the sub scanning direction of the ink ejection opening 87 of the ink jet head 85 2 . May occur.
    In such a case, to correct the position displacement of the sub-scan direction by varying for the ink ejection timing of each set of ink ejection orifices of the ink jet head (85 2) to the ink ejection timing of the ink discharge ports, each set of the ink jet head (85 1) have. That is, the discharge timing of the ink is changed by changing the selection order of the drive voltage waveforms shown in Figs. 4A, 4B, and 4C as in the first embodiment described above, and the positional displacement in the sub-scanning direction is changed. Calibrate
    Next, a seventh embodiment of the present invention will be described with reference to FIG.
    As shown in Fig. 24, the movement of the recording medium in the direction indicated by the arrows in the figure, for example, four inkjet heads 91 1 , 91 2 , 91 3 , 91 4 in which a plurality of ink chambers provided with ink ejection openings are arranged; The serial recording head is constructed by being spaced apart by a predetermined distance in the direction, that is, in the sub-scanning direction and in the main scanning direction orthogonal to the moving direction of the recording medium.
    In this serial recording head, each of the ink jet heads 91 1 to 9 4 is zigzag arranged with three ink discharge ports, and the ink chambers are divided into three groups of two ink chambers. And, the first jojjae of the ink jet head (91 2) on the basis of the lines (1i) in the sub-scan direction by the array of ink ejection orifices 92 of the first jojjae of the ink jet head (91 1) of the left end of ink ejection orifices (93) the line (2i) of the sub-scanning array direction are spaced a distance d1, lines (3i) of the ink discharge port 94 of the first jojjae of the ink jet head (91 3) arranged a sub-scanning direction are spaced apart by a distance d2 The lines 4i in the sub-scan direction, which are arranged by the first set of ink ejection openings 95 of the inkjet head 91 4 , are spaced apart by the distance d3.
    This serial recording head moves in the main scanning direction while the movement of the recording medium is stopped to simultaneously perform dot printing of a plurality of lines.
    In this serial recording head, for example, the inkjet head 9 1 1 is a navy blue inkjet head, the ink jet head 9 1 2 is a magenta inkjet head, the ink jet head 9 3 3 is a yellow ink jet head, and the ink jet head 9 14 is black. When the inkjet head is used, a serial recording head of color is used.
    In the serial recording head in the color, each ink-jet head (91 1, 91 2, 91 3), wherein each ink jet head in the case the overlapping of dots which is displaced in the main scan direction (91 1, 91 2, 91 3) When the ink ejection timing from each set of ink ejection openings is controlled by changing the selection order of the drive voltage waveforms shown in Figs. 4A, 4B, and 4C as in the first embodiment described above, Position displacement can be corrected.
    Next, the structural example of the inkjet head used by each embodiment mentioned above is demonstrated.
    FIG. 25 shows an inkjet head of a type that heats and discharges ink in an ink chamber, and forms a recessed groove at a predetermined pitch on one side of the substrate 101, and forms an upper portion of the groove on a top plate. And a plurality of ink chambers 105 are formed by blocking the entire surface with the orifice plate 104 having the ink ejection opening 103 open at the same time. In each of the ink chambers 105, a heat generating element 106 and electrode patterns 107 and 108 for energizing the heat generating element 106 are formed, and the heat generating element 106 and the electrode pattern ( 107 and 108 are covered with a protective layer 109.
    When a predetermined driving pulse is applied to the heating element 106 through the electrode patterns 107 and 108, the ink jet head rapidly heats the ink in the ink chamber, thereby causing a film boiling phenomenon. Ink is discharged from 103.
    When the line recording head is constituted by such an inkjet head, when a large number of heat generating elements are driven at the same time, a considerable supply power is required, resulting in a problem such as an increase in power supply. Therefore, by dividing each ink chamber, the number of heat generating elements to be driven at the same time is reduced, thereby reducing the amount of power supplied and miniaturizing the power source. In the case of such divisional driving, the positional displacement of the dot can be corrected by performing the configuration and control of the inkjet head as described in each embodiment. The same applies to the case where the serial recording head is constructed and divided driving is performed.
    26 is an inkjet head of a type which discharges ink in the ink chamber by mechanical vibration of the piezoelectric member, and forms a recessed groove at a predetermined pitch on one side of the substrate 111 made of the piezoelectric member. At that time, the actuator portion 112 polarized in the direction of the arrow in the center of the groove is formed, and the electrode patterns 113 and 114 are formed above and below the actuator portion 112, respectively. A plurality of ink chambers 118 are formed by blocking the upper portion of each groove with the upper plate 115 and the entire surface with the orifice plate 117 with the ink discharge port 116 open.
    When a predetermined drive pulse is applied between the electrode patterns 113 and 114 in this inkjet head, mechanical deformation occurs in the actuator portion 112 and a volume change of the ink chamber 118 occurs. As a result, a pressure change occurs in the ink chamber, and ink is discharged from the ink discharge port 116.
    Such an inkjet head constitutes a line recording head or a serial recording head, and when the respective ink chambers are dividedly driven, the positional displacement of the dots can be corrected by performing the configuration and control of the inkjet head as described in each embodiment. .
    Also shown in FIG. 27 is an inkjet head of a type which discharges ink in an ink chamber by mechanical vibration of a piezoelectric member, and attaches two polarized piezoelectric members so that their polarization directions face each other, thereby forming a substrate 121. Concave grooves are formed over two piezoelectric members at predetermined pitches on one surface side of the substrate 121, and electrode patterns 122 are formed on both side walls and bottom surfaces of the grooves. A plurality of ink chambers 126 are formed by blocking the upper portion of each groove with the upper plate 123 and simultaneously blocking the entire surface with the orifice plate 125 with the ink discharge port 124 open.
    The inkjet head is supplied with a predetermined driving pulse between the electrode pattern 122 of the ink chamber 126 that performs ink ejection and the electrode pattern 122 of the ink chambers 126 adjacent to the ink chamber 126. Then, the piezoelectric members constituting the partition wall between the ink chambers 126 on both sides cause mechanical deformation, thereby causing a volume change of the ink chamber 126 to perform ink ejection. As a result, a pressure change occurs in the ink chamber, and ink is discharged from the ink discharge port 124.
    In such an inkjet head, since the partition wall between the ink chamber for performing ink ejection and the ink chamber adjacent thereto is deformed, each ink chamber is inevitably divided and driven. Therefore, the positional displacement of a dot can be correct | amended by performing structure and control of this inkjet head as described in each embodiment.
    Thus, in each embodiment, various inkjet heads can be used.
    In addition, although the inkjet head was described in the above-mentioned embodiment, it is not limited to an inkjet head, The invention can be applied also to a thermal head.
    Moreover, the zigzag arrangement described in each embodiment also includes the arrangement as shown in FIG.
    As described above, according to the present invention, the printing head drive method can correct the printing displacement between dots in the sub-scanning direction by simple control and the printing displacement between dots in the main scanning direction by simple control. Can be provided.
    权利要求:
    Claims (8)
    [1" claim-type="Currently amended] A recording head in which a plurality of recording elements are arranged parallel to the main scanning direction orthogonal to the moving direction of the recording medium relatively moved with respect to the recording element, and spaced apart by a predetermined distance in the sub-scanning direction which is the moving direction of the recording medium. ,
    Each of the recording elements is divided into N groups of N-1 (where N≥2 integer), and the recording elements are zigzag between the groups, and each recording element is sequentially divided by groups at a predetermined timing at a predetermined timing. And the displacement of the dot in the sub-scanning direction by the dot recorded by the recording element of one set of the recording element as a reference and the recording element of each group of the recording element other than the reference recording element is When more than 1/2 of the pitch between adjacent recording elements zigzag arranged in the sub-scanning direction is changed, the driving order of the recording elements of each pair of other recording elements is changed so that the adjacent recording elements in which the displacement of the dots are zigzag-placed in the sub-scanning direction. A method of driving a recording head, wherein the recording head is corrected to 1/2 or less of the pitch between.
    [2" claim-type="Currently amended] The driving method of claim 1, wherein the recording head in which the plurality of recording elements are arranged is a column head.
    [3" claim-type="Currently amended] A plurality of inkjet heads arranged with a plurality of ink chambers provided with ink ejection openings are parallel to the main scanning direction orthogonal to the moving direction of the recording medium relatively moved relative to the head, and in the sub-scanning direction which is the moving direction of the recording medium. In the recording heads spaced apart by a predetermined distance,
    The ink chambers of each of the inkjet heads are divided into N groups of N-1 (where N≥2 integers), and the ink ejection openings of the ink chambers are zigzag between the groups, and the ink chambers are predetermined by groups. The ink is ejected from the ink ejection port of each set of ink chambers of the other inkjet heads other than the inkjet head and the ink ejection head of the ink chamber of one set of inkjet heads which are sequentially driven at the timing of When the displacement of the dot in the sub-scanning direction exceeds 1/2 of the dot pitch in the sub-scanning direction, the ink ejection order from the ink ejection openings of the ink chambers of the respective ink jet heads of the other inkjet heads is changed to change the dot displacement in the sub-scanning direction. A method of driving a recording head, wherein the recording head is corrected to 1/2 or less of a dot pitch.
    [4" claim-type="Currently amended] 4. The method of driving a recording head according to claim 3, wherein the positions of the ink ejection openings are set so as not to overlap each other in the main scanning direction between the inkjet heads having different arrangement positions in the sub-scanning direction.
    [5" claim-type="Currently amended] 5. The recording according to claim 3 or 4, wherein the inkjet heads having different arrangement positions in the sub-scanning direction are used as the heads for printing the respective colors of yellow, indigo, and magenta, respectively, and color printing is performed by these heads. How to drive the head.
    [6" claim-type="Currently amended] A plurality of inkjet heads arranged with a plurality of ink chambers provided with ink ejection openings are alternately zigzag arranged on each side of a substrate having parallel surfaces on both sides in a main scanning direction orthogonal to a moving direction of a recording medium relatively moved relative to the head. In one recording head,
    The ink chambers of the respective inkjet heads disposed on the same side of the substrate are divided into N groups of N-1 (where N≥2 integers), and the ink ejection openings of the ink chambers are zigzag between the groups. The ink chamber is sequentially driven by time division at predetermined timing in units of groups, and the ink ejection from the ink ejection opening of one set of ink chambers of the inkjet head, which is the reference, in each of the inkjet heads arranged on the same surface side, and the inkjet head serving as the reference In the ink chamber of each set of the other inkjet heads when the displacement of the dot in the sub-scanning direction by ink ejection from the ink ejection port of each set of the different inkjet heads exceeds 1/2 of the dot pitch in the sub-scanning direction A method of driving a recording head, characterized in that the ink ejection order from the ejection openings is changed to correct the displacement of the dots to 1/2 or less of the dot pitch in the sub-scanning direction.
    [7" claim-type="Currently amended] A recording head in which a plurality of inkjet heads arranged with a plurality of ink chambers provided with ink ejection openings are arranged side by side in a main scanning direction orthogonal to a moving direction of a recording medium relatively moving with respect to the head on the same surface of a substrate,
    The ink chambers of each of the inkjet heads are divided into N groups of N-1 (where N≥2 integers), and the ink ejection openings of the ink chambers are zigzag between the groups, and the ink chambers are predetermined by groups. The ink is ejected from the ink ejection port of each set of ink chambers of the other inkjet heads other than the inkjet head and the ink ejection head of the ink chamber of one set of inkjet heads which are sequentially driven at the timing of When the displacement of the dot in the sub-scanning direction exceeds 1/2 of the dot pitch in the sub-scanning direction, the ink ejection order from the ink ejection openings of the ink chambers of the respective ink jet heads of the other inkjet heads is changed to change the dot displacement in the sub-scanning direction. A method of driving a recording head, wherein the recording head is corrected to 1/2 or less of a dot pitch.
    [8" claim-type="Currently amended] A plurality of inkjet heads having a plurality of ink chambers provided with ink ejection openings arranged in a main scanning direction parallel to the sub-scanning direction, which is a moving direction of a recording medium relatively moved with respect to the head, and orthogonal to the moving direction of the recording medium. A recording head arranged at a distance of a predetermined distance,
    The ink chambers of each of the inkjet heads are divided into N groups of N-1 (where N≥2 integers), and the ink ejection openings of the ink chambers are zigzag between the groups, and the ink chambers are predetermined by groups. The ink is ejected from the ink ejection port of each set of ink chambers of the other inkjet heads other than the inkjet head and the ink ejection head of the ink chamber of one set of inkjet heads which are sequentially driven at the timing of When the displacement of the dot in the main scanning direction exceeds 1/2 of the dot pitch in the main scanning direction, the ink ejection order from the ink ejection openings of the ink chambers of the respective ink jet heads is changed to change the dot displacement in the main scanning direction. A method of driving a recording head, characterized in that it is corrected to 1/2 or less.
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    同族专利:
    公开号 | 公开日
    JPH11240158A|1999-09-07|
    EP0938976A1|1999-09-01|
    JP4028067B2|2007-12-26|
    KR100286506B1|2001-03-15|
    CN1229728A|1999-09-29|
    US6533379B1|2003-03-18|
    SG74706A1|2000-08-22|
    CN1108927C|2003-05-21|
    DE69916354D1|2004-05-19|
    DE69916354T2|2005-06-23|
    EP0938976B1|2004-04-14|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1998-02-26|Priority to JP04579398A
    1998-02-26|Priority to JP98-045793
    1999-02-24|Application filed by 구보 마쯔오, 도시바 테크 가부시키가이샤
    1999-09-27|Publication of KR19990072880A
    2001-03-15|Application granted
    2001-03-15|Publication of KR100286506B1
    优先权:
    申请号 | 申请日 | 专利标题
    JP04579398A|JP4028067B2|1998-02-26|1998-02-26|Driving method of recording head|
    JP98-045793|1998-02-26|
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