JP2004050445A - Liquid ejecting head, liquid ejector, and liquid ejecting method - Google Patents

Liquid ejecting head, liquid ejector, and liquid ejecting method Download PDF

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Publication number
JP2004050445A
JP2004050445A JP2002207486A JP2002207486A JP2004050445A JP 2004050445 A JP2004050445 A JP 2004050445A JP 2002207486 A JP2002207486 A JP 2002207486A JP 2002207486 A JP2002207486 A JP 2002207486A JP 2004050445 A JP2004050445 A JP 2004050445A
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Japan
Prior art keywords
head
liquid
nozzle
overlap
ejection
Prior art date
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Pending
Application number
JP2002207486A
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Japanese (ja)
Inventor
Mitsugi Ishihara
石原 貢
Original Assignee
Sony Corp
ソニー株式会社
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Priority to JP2002207486A priority Critical patent/JP2004050445A/en
Publication of JP2004050445A publication Critical patent/JP2004050445A/en
Pending legal-status Critical Current

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Abstract

<P>PROBLEM TO BE SOLVED: To prevent occurrence of nonuniformity in density, a white streak, or the like, using a line head type liquid ejection head forming an overlapped part between adjacent head chips. <P>SOLUTION: The liquid ejecting head comprises a plurality of head chips 62 each consisting of a substrate 7 arranged with a plurality of elements 8 for ejecting liquid from ejection nozzles and a circuit 69 for driving each element 8, and a nozzle sheet 61 having nozzles 65 for ejecting the liquid formed in correspondence with the elements 8 formed on the substrate 7 and applied to the substrate 7. The plurality of head chips 62 are arranged in zigzag along the center line in the longitudinal direction such that an overlapping part 51 of a specified number of ejection nozzles 65 is formed between adjacent head chips 62 in the longitudinal direction. At the overlapping part 51, driving position of the ejection nozzle 65 is switched between one head chip 62 and the other head chip 62 when they are driven. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a liquid ejection apparatus and a liquid ejection method for ejecting a liquid such as ink and landing a droplet on a target.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there has been an ink jet printer that discharges ink droplets from thin nozzles provided side by side on a printer head, lands the ink droplets on a recording medium such as paper, and records characters and images with dots. This ink jet printer is characterized by a high recording speed, a low recording cost, and easy colorization.
[0003]
As a printer head in this ink jet printer, there are a so-called serial head which is shorter than the page width of the sheet, and a so-called line head which is longer than the page width of the sheet. Further, as a method of discharging ink, there are a piezo method using a piezoelectric element and a thermal method using a heating element.
[0004]
Of these, the line head does not need to be moved in the page width direction of the paper by a driving means such as a motor at the time of recording unlike the serial head, so the driving means is not required, and the printer body can be reduced in size and cost. There is a feature that it is easy to plan. In addition, the thermal method is advantageous in that it can be used for a line head because the number and arrangement density of driving elements for ejecting ink droplets can be relatively easily increased as compared with the piezo method. There is. For this reason, an ink jet printer having a thermal type line head has been proposed.
[0005]
This line head is a heating element that heats the ink held in the ink liquid chamber while sequentially arranging ejection nozzles for the printing width for the recording paper in each color row in a direction substantially orthogonal to the recording paper conveyance direction. A certain heater is formed on one semiconductor substrate, and ink droplets are selectively ejected from each ejection nozzle while transporting the recording paper to land on the recording paper.
[0006]
[Problems to be solved by the invention]
Here, there are conventional line head type head chips that are arranged in a staggered manner, but since these head chips are simply arranged shifted in parallel, as shown in FIG. Two adjacent nozzle groups NG A , NG B Were also simply shifted in parallel. In an ink jet printer to which this arrangement is applied, variations in the amount of ink ejected between head chips, errors in the impact position of ink on paper, and the like are caused by variations in head chip characteristics and positioning errors. As a result, it is difficult to keep a uniform dot interval at a joint between head chips.
[0007]
For this reason, there is a line head in which a part of a nozzle row overlaps a predetermined number of nozzles between adjacent head chips. In this line head, when the ink droplets land on the recording paper, the nozzles that eject ink of the same color are arranged in a double manner in the overlap portion. It is necessary to drive only one of the nozzles.
[0008]
However, if the driving positions of the nozzles in the overlapping portion are fixed uniformly at the center of the overlapping portion or the like, the configuration of the driving circuit for switching the driving position of the head chip can be simplified, while As described above, due to the mounting error of the head chip and the variation of the head chip characteristics such as the expansion and contraction of the nozzle plate, an error of the ink landing position on the paper occurs in each overlap portion, and uneven density and white stripes are generated. Can occur.
[0009]
More specifically, in each overlapping portion, due to misalignment of the mounting position between adjacent head chips, bending of the ink ejection direction, or the like, a dot is formed in a region corresponding to a joint of head chips on paper. Overlap and gaps between dots occur. For example, as shown in FIG. 11, a dot group DG recorded by one nozzle group A And a dot group DG recorded by the other nozzle group B At the boundary between the two, a dot overlap O occurs, or a dot gap C occurs, for example, as shown in FIG. Due to the overlapping of these dots and the gaps between the dots, density unevenness and white stripes in the sheet feeding direction occur.
[0010]
Therefore, the present invention provides a liquid ejection head, a liquid ejection device, and a liquid ejection apparatus that prevent the occurrence of uneven density and white stripes using a line head type liquid ejection head that forms an overlap portion between adjacent head chips. An object is to provide a discharge method.
[0011]
[Means for Solving the Problems]
In order to solve the above-described problem, a liquid discharge head according to the present invention includes a substrate on which a plurality of elements for discharging liquid from a discharge nozzle are provided and a drive circuit for driving each of the elements is formed, An ejection nozzle for ejecting the liquid is formed corresponding to each element formed on the substrate, and a plurality of head chips having a nozzle sheet provided on the substrate are provided. Are arranged in a staggered manner along the center line of the head chips, and are arranged so that an overlap portion in which a predetermined number of discharge nozzles overlap with a head chip adjacent in the longitudinal direction is formed. The one head chip and the other head chip are characterized in that the driving position of the discharge nozzle is switched during driving.
[0012]
Further, the liquid ejection apparatus according to the present invention includes a substrate on which a plurality of elements for ejecting liquid from the ejection nozzle are provided and a drive circuit for driving each of the elements is formed, and a substrate formed on the substrate. An ejection nozzle for ejecting the liquid is formed corresponding to the element, and a plurality of head chips having a nozzle sheet provided on the substrate are provided. The plurality of head chips are staggered along a center line in a longitudinal direction. Liquid ejection heads arranged in a matrix and arranged so that an overlap portion in which a predetermined number of ejection nozzles overlap with each other in a longitudinally adjacent head chip is formed, and a liquid is supplied to the head chip. A liquid cartridge; and a transport mechanism for transporting a target on which the liquid discharged from the head chip lands. Dochippu and the other head chip, is characterized in that the driving position of the discharge nozzle is switched during operation.
[0013]
The liquid discharge method according to the present invention includes a liquid discharge head in which a plurality of discharge nozzles for discharging liquid are formed in a staggered manner along a longitudinal center line. While switching the drive position of the discharge nozzle of the overhead portion where a predetermined number of discharge nozzles overlap with a head chip adjacent in the longitudinal direction of the head chip, while conveying the target on which the liquid discharged from the head chip lands And discharging the liquid.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a printer device in which a liquid ejection head according to the present invention is applied to an inkjet printer head will be described in detail with reference to the drawings. In the following, it is assumed that the printer head of the printer has a recording range substantially the same as the page width of the paper P. In other words, the printer device includes the printer head, and performs printing by scanning the same portion on the sheet P only once in one printing. In the following, a description will be given assuming that the printer apparatus adopts a method of ejecting ink droplets by a thermal method and uses a heating element as a driving element.
[0015]
As shown in FIGS. 1 and 2, the printer 1 includes a printer head 3 having a recording range substantially the same as the page width of the paper P inside a housing 2 forming the external appearance of the printer 1. A transport unit 4 that transports the paper P in a predetermined direction, a paper feed unit 5 that feeds the paper P to the printer head 3, a paper tray 6 that stores the paper P, and an electric device that controls the driving of these units. A circuit section 7 is provided.
[0016]
The housing 2 is formed, for example, in a rectangular parallelepiped shape. A paper discharge port 11 for discharging the paper P is provided on one side surface of the housing 2, and a tray entrance 12 for attaching and detaching the paper tray 6 is provided on the other side surface facing the one side surface. I have.
[0017]
The printer head 3 includes, for example, four color lines of CMYK (cyan, magenta, yellow, and black). The printer head 3 is disposed above the end of the housing 2 on the side of the paper discharge port 11 such that a discharge nozzle (not shown) faces downward.
[0018]
The transport unit 4 includes a paper feed guide 15 that forms a supply path for feeding the paper P, paper feed rollers 16 and 17 that sandwich and feed the paper P, pulleys 18 and 19 described below, and a paper feed motor 20. Belts 22 and 23 for transmitting the drive to the pulleys 18 and 19 are provided, and are disposed inside the housing 2 below the end on the paper discharge port 11 side.
[0019]
The paper feed guide 15 is formed in a flat plate shape, and is disposed below the printer head 3 at a predetermined interval. The paper feed rollers 16 and 17 each comprise a pair of rollers that are in contact with each other, and are disposed on both sides of the paper feed guide 15, that is, on the tray entrance 12 side and the paper discharge port 11 side. The paper feed motor 20 is disposed below the paper feed guide 15 and is connected to the paper feed rollers 16 and 17 via pulleys 18 and 19 and belts 22 and 23.
[0020]
The paper supply unit 5 includes a paper supply roller 26 for supplying the paper P to the conveyance unit 4, a paper supply motor 28 as a driving source for driving a gear 27 to be described later, and a rotation by the paper supply motor 28. A driving gear 27 is provided, and is disposed on the tray entrance 12 side with respect to the transport unit 4. The paper feed roller 26 is formed in a substantially semi-cylindrical shape, and is disposed near the paper feed roller 16 on the tray entrance 12 side. The paper feed motor 28 is disposed above the paper feed roller 26, and is connected to the paper feed roller 26 via a gear 27.
[0021]
The paper tray 6 is formed in a box shape capable of storing a plurality of sheets of A4 size paper P, for example, and a paper support 32 locked by a spring 31 is provided at one end of the bottom surface. It is mounted in a space extending from below the section 5 to the tray entrance 12.
[0022]
The electric circuit unit 7 is a part that controls the driving of each unit, and is disposed above the paper tray 6.
[0023]
Such a printer 1 performs a printing operation as follows.
[0024]
First, in the printer device 1, the user turns on the power, pulls out the paper tray 6 from the tray entrance 12 to store a predetermined number of sheets of paper P, and pushes in the paper tray 6, whereby the paper tray 6 is mounted. You. Then, in the printer device 1, one end of the paper P is pressed against the paper feed roller 26 by the paper support 32 lifting one end of the paper P by the urging force of the spring 31. Then, in the printer device 1, one sheet of paper P is sent out from the paper tray 6 to the paper feed roller 16 by rotating the paper feed roller 26 by driving the paper feed motor 28.
[0025]
Subsequently, the printer 1 rotates the paper feed rollers 16 and 17 by driving the paper feed motor 20, and the paper feed roller 16 sandwiches the paper P sent from the paper tray 6 by a pair of rollers. The paper P is sent out to the paper feed guide 15. Then, the printer device 1 causes the printer head 3 to operate at a predetermined timing to eject ink droplets from the ejection nozzles and land on the paper P, thereby forming dots and characters and / or images on the paper P. Is recorded. Then, in the printer device 1, the paper P is discharged from the paper discharge port 11 by the paper feed roller 17 sandwiching the paper P sent out along the paper feed guide 15 between the pair of rollers.
[0026]
The printer device 1 repeats such an operation until recording is completed, and generates a printed matter.
[0027]
Next, the above-described electric circuit unit 7 in the printer device 1 will be described.
[0028]
As shown in FIG. 3, the electric circuit unit 7 has a signal processing / control circuit 41 that performs signal processing and control processing by software as a CPU (Central Processing Unit) or DSP (Digital Signal Processor) configuration, for example, and is predetermined. A correction circuit 42 in which the correction data is stored in a so-called ROM (Read Only Memory) map system, a head drive circuit 43 for driving the printer head 3, a drive for the paper feed motor 20 and the paper feed motor 28, and The control circuit includes various control circuits 44 for controlling other operations, a memory 45 such as a line buffer memory or a one-screen memory, and a signal input unit 46 to which signals such as print data are input. To the signal processing / control circuit 41, a correction circuit 42, a head drive circuit 43, various control circuits 44, and a memory 45 are connected.
[0029]
When a signal such as recording data is input to the signal processing / control circuit 41 via the signal input unit 46, the electric circuit unit 7 arranges the signal in the recording order by the signal processing / control circuit 41 and sends the signal to the correction circuit 42. The correction circuit 42 performs correction processing such as so-called gamma correction, color correction, and variation correction of each nozzle. The signal such as the print data after the correction is taken out to the signal processing / control circuit 41 according to external conditions such as a nozzle number, a temperature, and an input signal. Then, the electric circuit section 7 supplies the signal extracted by the signal processing / control circuit 41 to the head drive circuit 43 and various control circuits 44 as drive signals. The electric circuit unit 7 controls the driving of the printer head 3 by the head drive circuit 43 based on the driving signal. Further, the electric circuit unit 7 controls the driving of the paper feed motor 20 and the paper feed motor 28 based on the drive signal by the various control circuits 44, and also performs the drive control at the time of the cleaning process of the printer head 3 and the like.
[0030]
In the electric circuit section 7, signals such as recording data are temporarily recorded in the memory 45 as needed, and are taken out by the signal processing / control circuit 41. The number of the memories 45 is equal to the number of the head chips 3. In this memory 45, data of one head chip including the print data of the overlap section 51 for printing one line on the paper P is recorded. In the electric circuit section 7, the signal processing / control circuit 41 receives data of each head chip 3 from the memory 45.
[0031]
Further, in the electric circuit section 7, a random number generator 47 for switching the driving position of the ejection nozzle 6 of the head chip 3 formed in the printer head 3 is connected to the signal processing / control circuit 41 as described later. . The electric circuit unit 7 receives from the random number generator 47 a random number for the signal processing / control circuit 41 to determine the switching position of the ejection nozzles 6 formed at both ends of each head chip 3 in the overlap unit 51. The signal processing / control circuit 41 receives the data of each head chip 3 and the data of the nozzle switching position, and supplies the data to the head drive circuit 43 as a drive signal, thereby controlling the drive range of the nozzle group formed in each head chip 3. Control.
[0032]
Next, the printer head 3 applied to the printer device 1 will be described.
[0033]
The printer head 3 is a line printing type ink jet printer head in which a plurality of recording elements for discharging ink from discharge nozzles are arranged in a print width direction. As shown in FIGS. 4 and 5, the printer head 3 is formed of an electroformed layer of nickel or a material containing nickel, and an ink discharge nozzle row is formed substantially linearly in a printing width direction across the paper P. Nozzle sheet 61, a plurality of head chips 62, which are sequentially arranged on the nozzle sheet 61 in a straight line corresponding to the ejection nozzle rows of the respective colors and are bonded to the nozzle sheet 61, and are arranged on the nozzle sheet 61. And a member 63 for forming an ink flow path between the ink cartridge and the head cartridge.
[0034]
In the nozzle sheet 61, the ejection nozzles 65 of each color of yellow, magenta, cyan, and black are formed in four lines substantially linearly in the printing width direction crossing the paper P. The discharge nozzle 65 has a shape in which the tip of a circular cone is cut off at a plane parallel to the bottom surface, and the diameter decreases in the ink discharge direction. Accordingly, the ejection nozzle 65 can stabilize the ejection angle of the ink, and can improve the landing accuracy of the ink.
[0035]
The head chip 62 is formed by processing a substantially rectangular silicon substrate 67 by an integrated circuit technique, and heaters 68 which are heating elements for heating ink are formed sequentially in the printing width direction. A driving circuit 69 for driving the driving circuit 68 is formed. In the head chip 62, a heater 68 is provided near a side surface of the silicon substrate 67 in the longitudinal direction. In the head chip 62, a dry film 70 in which a partition wall corresponding to each heater 68 is formed on a silicon substrate 67 is provided. Since the dry film 70 has a comb-like side surface on which the heater 68 is formed, an ink liquid chamber 71 is formed on each heater 68 and the ink liquid chamber 71 is formed in the longitudinal direction of the silicon substrate 67. It is exposed from the side of the direction. In the head chip 62, the nozzle sheet 61 is disposed on the heater 68 such that the discharge nozzle 65 is located via the dry film 70.
[0036]
The member 63 is provided for forming an ink liquid chamber 71 and an ink flow path 72 for flowing ink to the ink liquid chamber 71. The member 63 is formed of a photosensitive resin such as a so-called dry film photoresist.
[0037]
In the printer head 3, an ink channel 72 is formed by the member 63 and the dry film 70 so as to guide the ink of the ink cartridge from the side where the ink liquid chamber 71 of the head chip 62 is exposed. Accordingly, the printer head 3 can guide the ink to the ink liquid chamber 71 of each heater 68 from the side edge of the head chip 62 in the longitudinal direction.
[0038]
The head chip 62 has a pad 64 formed on the side opposite to the side on which the heater 68 is formed, and a flexible wiring board 66 is connected to the pad 64. The head chip 62 receives a control signal from the flexible wiring board 66 and discharges ink droplets from the discharge nozzle 65 of the ink liquid chamber 71.
[0039]
As shown in FIG. 6, the printer head 3 has such a head chip 62 arranged on the nozzle sheet 61 in a substantially staggered manner along the longitudinal direction of the head chip 62 with the ink flow path 72 interposed therebetween for each color. This forms a head chip line. That is, the printer head 3 has a substantially zigzag shape along the longitudinal direction of the head chip with the ink nozzles 72 interposed therebetween in the printing width direction in which the ejection nozzle rows of the respective colors of yellow, magenta, cyan, and black traverse the paper P. The line 75 is formed. In the printer head 3, yellow, magenta, cyan, and black lines 75 are sequentially formed in the feed direction of the paper P, which is orthogonal to the print width direction.
[0040]
The printer head 3 has a predetermined number of head chips 62 formed in a zigzag pattern with the ink flow path 72 interposed between the head chips 62 in the longitudinal direction of the head chips 62 in the lines 75 of the respective colors. The overlapping portion 51 where the discharge nozzles 65 overlap each other is formed. That is, as shown in FIG. 7, the line 75 of the head chips 62 formed on the printer head 3 is located on the left side of the nozzle group corresponding to each of the adjacent head chips 62 arranged in a staggered manner. Nozzle group 65 of head chip 62 A A predetermined number of ejection nozzles 65 from the right end and a nozzle group 65 of the head chip 62 located on the right side. B And the same number of ejection nozzles 65 are arranged from the left end in such a manner that their center lines coincide with each other via the ink flow path 72, and an overlapping portion of these ejection nozzles 65 is provided as an overlap portion 51.
[0041]
The overlap portion 51 is similarly provided on each of the yellow, magenta, cyan, and black lines 75. That is, the line 75 of each color is connected to the nozzle group 65 adjacent to each other in each overlap portion 51. A And 65 B The number of overlapping discharge nozzles 65 is the same, and the center lines of the discharge nozzles 65 are aligned. Therefore, as shown in FIG. 6, the printer head 3 has the overlap portion 51 formed substantially linearly in the feed direction of the paper P.
[0042]
In the overlap section 51, one of the nozzle groups 65 A And the other nozzle group 65 B The driving position of each of the ejection nozzles 65 that constitutes one of the nozzle groups 65 is randomly switched. A Dot group D recorded by A And the other nozzle group 65 B Dot group D recorded by B And the position of the joint changes randomly.
[0043]
One of the nozzle groups 65 in the overlap portion 51 A And the other nozzle group 65 B Is switched by using a random number r that randomly generates an integer from 0 to a maximum of s. That is, as shown in FIG. A And the other nozzle group 65 B Is randomly switched by random numbers for each line 75 of each color. In addition, the overlap portion 51 also has one nozzle group 65 in one line 75. A And the other nozzle group 65 B And the position of the joint is randomly switched by a random number for each overlap portion 51.
[0044]
That is, the nozzle groups 65 formed on the head chips 62, 62 adjacent to each other. A , 65 B Among the overlapping portions 51 in which s ejection nozzles 65 are arranged so as to overlap, a certain random number r 1 Is obtained, one of the nozzle groups 65 A R from the left end of 1 The discharge nozzles 65 up to the first one are driven, and the other nozzle group 65 B From the right end of 1 Up to the number of ejection nozzles 65 are driven. Further, in another overlap unit 51, another random number r 2 Is obtained, and one nozzle group 65 is obtained. A R from the left end of 2 The discharge nozzles 65 up to the first one are driven, and the other nozzle group 65 B From the right end of 2 Up to the number of ejection nozzles 65 are driven.
[0045]
For example, as shown in FIG. 8, among the nozzle groups formed on the head chips 62, 62 adjacent to each other, the overlap portion 51 in which 16 discharge nozzles 65 are arranged so as to overlap, the random number r = 12 is obtained, in the overlap portion 51, one d nozzle group 65 A Up to the twelfth ejection nozzle 65 from the left end are driven, and the other nozzle group 65 B Are driven from the right end to 16-12 = 4 ejection nozzles 65. In the other overlapping section 51, a random number r = 7 is obtained, and one of the nozzle groups 65 A Are driven from the left end to the seventh nozzle group, and the other nozzle group 65 B Of the nozzles from the right end to 16−7 = 9 are driven.
[0046]
As a result, the printer head 3 moves one nozzle group 65 indicated by a black circle. A Dot group D recorded by A And the other nozzle group 65 indicated by a white circle B Dot group D recorded by B Dot group D corresponding to the overlap portion 51 O Can be formed. Dot group D O Is one of the nozzle groups 65 A And the other nozzle group 65 B Thus, the connection with the dot recorded is randomly switched.
[0047]
Therefore, the printer head 3 to which the present invention is applied includes the nozzle group 65 in the overlap section 51. A , 65 B Are randomly switched for each overlap portion 51. For this reason, the printer head 3 is unable to operate the nozzle group 65 due to variations in head chip characteristics and positioning errors. A , 65 B Even if the ejection amount of the ink ejected from each of the ejection nozzles 65 fluctuates or an error occurs in the ink landing position, the overlap or the gap occurs, the overlap or the gap is scattered. Therefore, the printer head 3 moves the dot group D recorded on the paper P in the overlap section 51. O It is possible to prevent the occurrence of band-like noise such as uneven density and white stripes.
[0048]
In addition, with respect to the present invention as described above, a switching position where the dot interval in the overlap portion is most appropriate is searched for from the result of printing the test pattern, the position is stored in the memory, and the switching of the ejection nozzle between chips is performed. There is a way to position it. However, in this method, it is necessary to individually check which switching position is appropriate for all of the overlapped portions. In a printer head having a large number of head chips, this operation requires a great deal of time and labor. .
[0049]
On the other hand, according to the printer head 3 to which the present invention is applied, the nozzle group 65 in the overlap portion 51 is provided. A , Nozzle group 65 B And the position of the joint is randomly switched by a random number. Therefore, the printer head 3 does not need the time to check the dot interval in the overlap unit 51, and the dot group D recorded on the paper P is not required. O It is possible to prevent the occurrence of band-like noise such as uneven density and white stripes.
[0050]
The switching of the driving position of the discharge nozzle 65 in the overlapping section 51 as described above is performed as follows. That is, in order to print one line on the print medium, the electric circuit unit 7 stores the memory 45 for storing the data of one head chip 62 including the print data of the overlap unit 51 according to the number of the head chips 62. Have the same number. The switching of the head chip 62 is performed by changing the data for ink ejection from two nozzles at both ends in the memory 45 to where and how many of the nozzle groups are effective, that is, to which ejection nozzle 65 the ink is ejected. Is performed depending on whether or not to insert data.
[0051]
In the electric circuit unit 7, the integer from 0 to s, where the number of nozzles overlapping in the overlap unit 51 is the maximum value s, is randomly transmitted to the signal processing / control circuit 41 by the random number generator 47 and received. The signal processing / control circuit 41 supplies the drive signal to the head drive circuit 43. As a result, the printer head 3 moves the nozzle group 65 in the overlap section 51. A , Nozzle group 65 B And the position of the joint is randomly switched by a random number.
[0052]
Next, in a scan for printing so as not to generate a displacement due to a step between the head chips 62, while maintaining the ejection timing of the succeeding chip group with respect to the preceding chip group, the corresponding head chip 62 is used in accordance with the data in each memory 45. The discharge nozzle 65 is driven.
[0053]
As described above, according to the printer device 1 to which the present invention is applied, the nozzle group 65 A , 65 B Are randomly switched for each overlap portion 51. For this reason, the printer apparatus 1 may be configured to use the nozzle group 65 due to variations in head chip characteristics, positioning errors, and the like. A , 65 B Even if the ejection amount of the ink ejected from each of the ejection nozzles 65 fluctuates or an error occurs in the ink landing position, the overlap or the gap occurs, the overlap or the gap is scattered. Therefore, the printer device 1 controls the dot group D recorded on the paper P in the overlap section 51. O It is possible to prevent the occurrence of band-like noise such as uneven density and white stripes.
[0054]
The printer head of the printer device 1 to which the present invention is applied has a nozzle group 65 in the overlap section 51. A , Nozzle group 65 B Is stored in the random number table 48 in advance as a random number or an integer from 0 to the maximum s corresponding to the random number, and is output from the random number table 48 as an access variable using the number of the line 75 associated with the scan. The switching position may be changed according to the value r.
[0055]
The access variables of the table data may be, for example, for each scan line, for each head chip group (yellow, magenta, cyan, and black) corresponding to each ink, and for each column (vertical) of the overlap section 51. It may be a combination. For example, when all the variables described above are used, it means that random numbers are generated in all the overlap units 51. When a random number is used, a random number generated at an arbitrary time can be used.
[0056]
Further, this table data is stored in the nozzle group 65. A , Nozzle group 65 B The same number of points as the number of points that can be the seam, and the value determined so that the seam position does not overlap between adjacent lines and the seam seen from any overlap part 51 does not approach This may be repeated periodically to switch the joint.
[0057]
For example, as shown in FIG. A And the other nozzle group 65 B Are formed so as to overlap 16 discharge nozzles 65, the nozzle group 65 A , Nozzle group 65 B There are 17 points that can be connected to. Therefore, in the table data, the points which can be the 17th joint are made different for each line of each color, and the joints between the overlapped portions 51 of the respective lines formed in the feed direction of the paper P approach. Set variables so that there is nothing. The table head is periodically repeated to switch the joints, so that the printer head 3 can control the nozzle group 65 due to variations in head chip characteristics, positioning errors, and the like. A , 65 B Even if the ejection amount of the ink ejected from each of the ejection nozzles 65 fluctuates or an error occurs in the ink landing position, the overlap or the gap occurs, the overlap or the gap is scattered. Therefore, the printer device 1 controls the dot group D recorded on the paper P in the overlap section 51. O It is possible to prevent the occurrence of band-like noise such as uneven density and white stripes.
[0058]
Note that the present invention is not limited to the above-described embodiment. For example, in the above-described embodiment, the description has been made assuming that a line head is used. However, the present invention scans the same portion on the paper P only once in one printing, that is, a printer head that performs so-called one-pass printing. Then, the present invention can be applied to a serial head.
[0059]
Further, in the above-described embodiment, the method in which ink droplets are ejected by the thermal method is employed, and the heating element is used as the driving element. However, the scale is increased and the resolution is reduced as compared with the thermal method. However, the present invention is also applicable to a piezo method using a piezoelectric element as a driving element.
[0060]
Further, in the above-described embodiment, the case where the present invention is applied to the printer head and the printer apparatus to eject ink droplets has been described. However, the present invention is not limited to this, and various dyes may be used instead of ink droplets. Liquid ejection head used for liquid droplets for forming a protective layer, a microdispenser in which liquid droplets are reagents, various measuring devices, various test devices, and liquid droplets are agents for protecting members from etching. Various pattern drawing devices, as well as printed wiring boards and circuits that discharge liquid containing metal microparticles to form fine wiring patterns on the substrate, or create elements with functions by spraying various materials onto the substrate The present invention can be widely applied to a substrate forming apparatus and the like.
[0061]
As described above, it goes without saying that the present invention can be appropriately changed without departing from the spirit of the present invention.
[0062]
【The invention's effect】
As described above in detail, according to the liquid ejection head, the liquid ejection device, and the liquid ejection method according to the present invention, in the overlap portion, the driving position of the nozzle is randomly switched for each overlap portion. . For this reason, variations in the ejection amount of the ink ejected from each ejection nozzle due to variations in the characteristics of the head chip, positioning errors, and the like, and errors in the ink landing positions cause dot overlap and gaps. Even if it occurs, these overlaps and gaps are scattered. Therefore, it is possible to prevent the occurrence of band noise such as uneven density and white stripes in the dot group recorded on the recording medium in the overlap portion.
[Brief description of the drawings]
FIG. 1 is a diagram showing a printer device to which the present invention is applied.
FIG. 2 is a sectional side view of the printer device to which the present invention is applied.
FIG. 3 is a block diagram illustrating a configuration of a recording and control system of an electric circuit unit in the printer device to which the present invention is applied.
FIG. 4 is a perspective view showing a printer head to which the present invention is applied.
FIG. 5 is a perspective view showing a printer head to which the present invention is applied.
FIG. 6 is a diagram showing lines of a head chip.
FIG. 7 is a diagram showing an overlap portion.
FIG. 8 is a diagram in which dots are recorded by randomly switching nozzle positions.
FIG. 9 is a diagram in which dot recording is performed by periodically repeating nozzle switching positions.
FIG. 10 is a diagram showing a conventional printer head.
FIG. 11 is a diagram illustrating dots that land on a sheet using a conventional printer head.
FIG. 12 is a diagram illustrating dots landed on a sheet using a conventional printer head.
[Explanation of symbols]
Reference Signs List 1 printer device, 3 printer head, 7 electric circuit section, 41 signal processing / control circuit, 43 head drive circuit, 44 control circuit, 45 memory, 47 random number generator, 51 overlap section, 61 nozzle sheet, 62 head chip, 63 members, 64 pads, 65 discharge nozzles, 66 flexible wiring board, 67 silicon substrate, 68 heater, 69 drive circuit, 70 dry film, 71 ink liquid chamber, 72 ink flow path, 75 lines

Claims (18)

  1. A substrate on which a plurality of elements for discharging liquid from a discharge nozzle are provided and a drive circuit for driving each of the above elements is formed; and a discharge for discharging the liquid corresponding to each element formed on the substrate. Nozzle is formed, comprising a plurality of head chips having a nozzle sheet provided on the substrate,
    The plurality of head chips are arranged in a zigzag pattern along the center line in the longitudinal direction, and an overlap portion in which a predetermined number of discharge nozzles overlap with the head chips adjacent in the longitudinal direction is formed. Arrayed,
    In the overlapping portion, the one head chip and the other head chip are liquid ejection heads in which the driving position of the ejection nozzle is switched during driving.
  2. The plurality of head chips are formed in a substantially staggered shape along the center line in the longitudinal direction to form one line, and a plurality of lines are provided such that the lines are parallel to each other.
    2. The liquid ejection head according to claim 1, wherein in the overlap portion, the drive position of the ejection nozzle is switched irregularly between the one head chip and the other head chip for each line.
  3. 3. The liquid ejection head according to claim 2, wherein the drive position of the ejection nozzle is switched by a random number for each line in the overlap section.
  4. 3. The liquid discharge head according to claim 2, wherein the drive position of the discharge nozzle in the overlap portion is switched according to a table prepared in advance for each line.
  5. 5. The liquid discharge head according to claim 4, wherein, in the overlap portion, the drive position of the discharge nozzle is periodically repeated according to the table.
  6. 2. The liquid ejection head according to claim 1, wherein the liquid is ink.
  7. A substrate on which a plurality of elements for discharging liquid from a discharge nozzle are provided and a drive circuit for driving each of the above elements is formed; and a discharge for discharging the liquid corresponding to each element formed on the substrate. A plurality of head chips each having a nozzle formed thereon and a nozzle sheet provided on the substrate, wherein the plurality of head chips are arranged in a staggered shape along a longitudinal center line and adjacent in the longitudinal direction. A liquid ejection head arranged so that an overlap portion where a predetermined number of ejection nozzles overlap with a head chip to be formed,
    A liquid cartridge for supplying liquid to the head chip,
    A transport mechanism for transporting a target on which the liquid discharged from the head chip lands,
    In the above-mentioned overlap portion, one of the head chips and the other head chip are liquid ejection devices in which the driving position of the ejection nozzle is switched during driving.
  8. The plurality of head chips are formed in a substantially staggered shape along the center line in the longitudinal direction to form one line, and a plurality of lines are provided such that the lines are parallel to each other.
    8. The liquid ejecting apparatus according to claim 7, wherein, in the overlapping portion, a driving position of the ejection nozzle is switched irregularly between one head chip and the other head chip for each line.
  9. 9. The liquid ejecting apparatus according to claim 8, wherein in the overlapping section, the drive position of the ejection nozzle is switched by a random number for each line.
  10. 9. The liquid ejecting apparatus according to claim 8, wherein in the overlapping section, the drive position of the ejection nozzle is switched according to a table prepared in advance for each line.
  11. 11. The liquid ejection apparatus according to claim 10, wherein the drive position of the ejection nozzle in the overlap portion is periodically repeated according to the table.
  12. The liquid ejecting apparatus according to claim 7, wherein the liquid is ink.
  13. A head chip in which a plurality of discharge nozzles for discharging liquid is formed has a liquid discharge head formed in a staggered shape along a longitudinal center line, and between a head chip adjacent to the liquid discharge head in the longitudinal direction. While switching the driving position of the discharge nozzle of the overhead portion where a predetermined number of discharge nozzles overlap,
    A liquid discharging method for transporting a target on which a liquid discharged from the head chip lands, and discharging the liquid.
  14. The head chip is formed in a substantially zigzag shape along the longitudinal center line to form one line, and a plurality of lines are provided such that the lines are parallel to each other.
    14. The liquid discharging method according to claim 13, wherein in the overlapping portion, the driving position of the discharging nozzle is switched irregularly between one head chip and the other head chip for each line.
  15. 15. The liquid discharge method according to claim 14, wherein the drive position of the discharge nozzle in the overlap portion is switched by a random number for each line.
  16. 15. The liquid discharge method according to claim 14, wherein in the overlap section, the drive position of the discharge nozzle is switched according to a table prepared in advance for each line.
  17. 17. The liquid discharge method according to claim 16, wherein the drive position of the discharge nozzle in the overlap portion is periodically repeated according to the table.
  18. 14. The method according to claim 13, wherein the liquid is ink.
JP2002207486A 2002-07-16 2002-07-16 Liquid ejecting head, liquid ejector, and liquid ejecting method Pending JP2004050445A (en)

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JP2006088393A (en) * 2004-09-21 2006-04-06 Fuji Xerox Co Ltd Inkjet recording head and inkjet recording device
JP2007253092A (en) * 2006-03-24 2007-10-04 Toppan Printing Co Ltd Functional liquid drop discharging method and manufacturing method of color filter
JP2009160876A (en) * 2008-01-09 2009-07-23 Dainippon Screen Mfg Co Ltd Image recording method and image recorder
US7753482B2 (en) 2007-03-22 2010-07-13 Seiko Epson Corporation Pattern forming method, liquid droplet discharging apparatus, and electrooptical device
JP2010241015A (en) * 2009-04-07 2010-10-28 Canon Inc Inkjet recorder and inkjet recording method
JP2012503271A (en) * 2008-09-15 2012-02-02 ケンブリッジ ディスプレイ テクノロジー リミテッド Method for inkjet printing organic electronic devices
EP2463106A1 (en) 2010-12-13 2012-06-13 Ricoh Company, Ltd. Image forming apparatus, method of processing image, and computer program
CN102602157A (en) * 2011-01-24 2012-07-25 精工爱普生株式会社 Printing apparatus and printing method
US8434843B2 (en) 2008-11-28 2013-05-07 Seiko Epson Corporation Printing apparatus, printing method, and program
WO2015152177A1 (en) * 2014-04-03 2015-10-08 コニカミノルタ株式会社 Image formation method
JP2015217601A (en) * 2014-05-16 2015-12-07 株式会社ミマキエンジニアリング Inkjet recording device and inkjet recording method
CN110418718A (en) * 2017-03-16 2019-11-05 柯尼卡美能达株式会社 Ink-jet recording apparatus and ink jet recording method

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006088393A (en) * 2004-09-21 2006-04-06 Fuji Xerox Co Ltd Inkjet recording head and inkjet recording device
JP4715143B2 (en) * 2004-09-21 2011-07-06 富士ゼロックス株式会社 Ink jet recording head and ink jet recording apparatus
JP2007253092A (en) * 2006-03-24 2007-10-04 Toppan Printing Co Ltd Functional liquid drop discharging method and manufacturing method of color filter
US7753482B2 (en) 2007-03-22 2010-07-13 Seiko Epson Corporation Pattern forming method, liquid droplet discharging apparatus, and electrooptical device
JP2009160876A (en) * 2008-01-09 2009-07-23 Dainippon Screen Mfg Co Ltd Image recording method and image recorder
JP2012503271A (en) * 2008-09-15 2012-02-02 ケンブリッジ ディスプレイ テクノロジー リミテッド Method for inkjet printing organic electronic devices
US8434843B2 (en) 2008-11-28 2013-05-07 Seiko Epson Corporation Printing apparatus, printing method, and program
JP2010241015A (en) * 2009-04-07 2010-10-28 Canon Inc Inkjet recorder and inkjet recording method
US8684490B2 (en) 2010-12-13 2014-04-01 Ricoh Company, Limited Image forming apparatus, method of processing image, and computer-readable recording medium
EP2463106A1 (en) 2010-12-13 2012-06-13 Ricoh Company, Ltd. Image forming apparatus, method of processing image, and computer program
CN102602157A (en) * 2011-01-24 2012-07-25 精工爱普生株式会社 Printing apparatus and printing method
WO2015152177A1 (en) * 2014-04-03 2015-10-08 コニカミノルタ株式会社 Image formation method
JPWO2015152177A1 (en) * 2014-04-03 2017-04-13 コニカミノルタ株式会社 Image forming method
US9908340B2 (en) 2014-04-03 2018-03-06 Konica Minolta, Inc. Image formation method
JP2015217601A (en) * 2014-05-16 2015-12-07 株式会社ミマキエンジニアリング Inkjet recording device and inkjet recording method
CN110418718A (en) * 2017-03-16 2019-11-05 柯尼卡美能达株式会社 Ink-jet recording apparatus and ink jet recording method

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