JPH1086384A - Ink jet recording device and recording method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain a proper compensation with fewer ink particles by deciding the charged condition of ink particles flying ahead and after a remark ink particle for compensating a recording signal and ink particles for effecting recording on martrixes above and below it and a compensating value or a compensating coefficient based on whether or not there needs a printing. SOLUTION: A recording signal Vn of aspecific ink particle corresponding to a dot position is obtained based on a printing pattern, and a compensated recording signal V' is obtained using uncompensated recording signals Vn-1, Vn-2 of ink particles frying one and two articles ahead, respectively, of thespecific ink particle and a charging strain compensating coefficient. Next, the recording signal is compensated with a compensating coefficient obtained in advance corresponding to whether or not there exists an ink particle and a coefficient so obtained is regarded as a recording signal V" of the specific ink particle. A compensation like this is carried out for each ink particle to thereby compensate the specific ink particle, whereby it is possible to characters each having less printing strain at a high speed and high image quality even when the printing distance is long.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for charging ink particles ejected from an ejection nozzle, deflecting the charged ink particles by a deflecting electrode, and printing a character / character on a recording medium.
The present invention relates to an ink jet printer that prints symbols and the like at high speed with high image quality.

[0002]

2. Description of the Related Art In an ink jet printer, there is a problem that a print distortion occurs in which a target print position is shifted from an actual print position, thereby deteriorating print quality. It is known that printing distortion is caused by mutual interference between ink particles such as air resistance and electrostatic force.

As a technique for reducing printing distortion, there is a technique described in, for example, JP-A-3-55262. In the ink jet printer described in this publication, a charge correction amount for the target ink droplet is obtained in accordance with a print presence / absence pattern of an ink droplet located in a predetermined vicinity of the target ink droplet and a print density of an ink droplet located farther from the nearby droplet. It discloses that a target ink droplet is corrected. Japanese Patent Application Laid-Open No. 63-145041 discloses that correction is performed in consideration of two droplets immediately before and immediately after a target ink droplet and ink droplets four, eight, and twelve before the target ink droplet. ing.

[0004]

Problems to be Solved by the Invention Japanese Patent Laid-Open No. 3-55262
In Japanese Patent Application Laid-Open Publication No. H11-157, since the ink density in the vicinity of the target ink droplet is 10 and the print density in the distance (how far apart the ink droplet is used is not clearly disclosed), a large number of memories are required. And the calculation time is required. In addition, Japanese Unexamined Patent Publication
In 3-145041 discloses, although the memory amount is smaller than the conventional example above, nevertheless, the number of correction factors is required 2 ⁷ kinds, obtains all the correction factor has a problem that it takes time. Also, among the ink droplets that classify the correction coefficient, among the ink droplets that fly behind the target ink droplet, the effects of the ink droplets that fly to the substantially same destination at the printing position of the target ink droplet are not considered. Another problem is that high-quality printing cannot be performed.

SUMMARY OF THE INVENTION An object of the present invention is to provide an ink jet recording apparatus which can determine an appropriate correction amount using a small amount of ink particles when determining a correction value or a correction coefficient for correcting a recording signal.

[0006]

In order to achieve the above object, a nozzle for ejecting ink particles, a means for generating a recording signal corresponding to recording information, a charging electrode for charging the ink particles, and a charging electrode for charging the ink particles are provided. A deflection electrode for deflecting the flight direction of the ink particles, and when printing a plurality of characters / symbols composed of a plurality of dot matrices in the deflection direction of the ink particles, the ink is changed while changing the stage into a dot matrix for each stage. Particles are sequentially deflected one by one, and the recording medium is relatively moved in a direction substantially perpendicular to the direction of the deflection,
In an ink jet recording apparatus for performing printing, a target particle for correcting a recording signal, an ink particle flying before and after a target particle for correcting a recording signal, and a dot matrix in which the target particle is printed with respect to a dot matrix above and below the deflection direction. It has a correction value or a correction coefficient for correcting the recording signal of the target particle depending on the charge state of the ink particle or the presence or absence of printing.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 19 shows an example of a schematic configuration of an ink jet recording apparatus to which the present invention is applied. The ink in the ink tank 1 is pressurized by a supply pump 2 and adjusted to a predetermined pressure by a pressure regulating valve 3 before being supplied to an ejection nozzle 4. An electrostriction element 5 is provided inside the injection nozzle 4,
By driving the electrostrictive element 5 by the excitation source 6, the ink particles 7 are regularly separated from the ejection nozzles 4 and ejected.

The ink particles 7 ejected regularly from the ejection nozzle 4 are charged by the charging electrode 8 when passing through the charging electrode 8. The charge amount is determined by the recording signal generating means 9.
It is determined by controlling a recording signal applied to the charging electrode 8 in accordance with a print pattern based on print information input from the outside. Then, the ink particles 7 charged with a predetermined charge amount when passing through the charging electrode 8 further fly between the upper deflection electrode 10 and the lower deflection electrode 11. The upper deflection electrode 10 is maintained at a high voltage by a high voltage power supply 12,
The lower deflection electrode 11 is grounded. The ink particles 7 receive a deflecting force corresponding to the charge amount from an electrostatic field formed between the upper deflecting electrode 10 and the lower deflecting electrode 11, and are deflected in the flight direction. On the other hand, ahead of the ink particle 7 in the flight direction, the recording medium 13 is moving in the direction A at a predetermined speed, and the ink particle 7 whose flight direction is deflected by the upper deflection electrode 10 and the lower deflection electrode 11 is one. Landed on the recording medium 13 one by one. Thus, predetermined characters, symbols, and the like can be printed on the recording medium 13. The recorded characters, symbols, etc. are composed of a dot matrix. Printing control in the vertical direction of the dot matrix is performed by controlling the amount of deflection of the ink particles 7 by the above-described deflection electrodes arranged vertically, and in the horizontal direction, the recording medium 13 is indicated by an arrow A.
By controlling the amount of movement in the direction of. Ink particles not involved in recording (hereinafter referred to as dummy particles) and ink particles not used for printing are not charged by the charging electrode 8 and are rectilinearly collected by the backlash 14.
It is returned to the ink tank 1 and reused.

A case of multi-stage printing for simultaneously printing a plurality of stages of characters / symbols composed of a plurality of dot matrices in the deflection direction of ink particles will be described. In the case of the printing scanning method in which ink particles are sequentially printed one by one while changing the stage with respect to the dot matrix of each stage, a deviation between a predetermined printing position and an actual printing position with respect to the target ink particles (hereinafter, referred to as a printing position). , The print distortion) was 25% or more of the dot diameter. as a result,
From the ink particle flying before the target ink particle, the ink particle flying immediately behind the target ink particle, and the dot matrix on which the target ink particle is printed, two
Ink dots that are printed on a dot matrix that is one dot away and that fly before the target ink particle, and that are printed on a dot matrix that is one dot away in the deflection direction from the dot matrix on which the target ink particle is printed, The printing is performed in a dot matrix separated by one in the deflection direction from the dot matrix on which the ink particles flying in front and the target ink particles are printed, and the printing deviation is affected by the ink particles flying behind the target ink particles. It was found to occur. Therefore, by determining the condition of the correction coefficient based on the charged state of these ink particles or the presence or absence of printing, and by correcting the recording signal of the target ink particles, the printing distortion can be reduced to 25% or less of the dot diameter, and with a small number of calculation conditions. There is an effect that high quality printing can be obtained.

First, a description will be given of a case where a dot matrix constituting one character is 7 dots vertically and 5 dots horizontally and three characters are printed in a deflection direction (hereinafter referred to as three-stage printing).

FIG. 18 shows the configuration of a dot matrix in three-stage printing. The scanning method of printing is as follows.
It is printed at the dot position of the row, the second is printed at the dot position of one column, two rows and one row, the third is printed at the dot position of one column, three rows and one row, and the fourth is the dot position of one column, two rows Print at the dot position,
Fifth, one dot, two rows, two rows are printed, and sixth, one column, three rows, two rows are printed, one dot at a time in the dot matrix arranged in the deflection direction. Printing is performed from the lowest dot of each dot matrix.

When the printing of the first column is completed, the second and subsequent columns are printed by the same scanning method as the first column.

FIG. 1 shows the flying state of each ink particle printed from the second row and the first row to the third row and the sixth row. The ink particles 32 used for determining the correction coefficient for the target ink particles 31 printed on the second row and the four rows are shown by oblique lines. FIG. 2 shows the target ink particles 31 and the dot positions where the ink particles 32 used to determine the correction coefficient are printed. In this embodiment, the ink particles 32 used for determining the correction coefficient include two rows and two rows, two rows and three rows, one row and four rows, and three rows and four rows.
The ink particles 32 are printed in two rows and two rows and five rows.
Depending on the presence or absence of printing and the amount of charge,
Are determined.

Next, a procedure for correcting a recording signal will be described. FIG. 17 shows the procedure. First, at 201, the recording signal Vn of the target ink particle corresponding to the dot position is obtained based on the print pattern. As an example, Vn is as follows. The first row and the first row are 70 (V), the first row and the second row are 8
When the dot position is shifted by one in the deflection direction, such as 0 (V), the first row and the third row, such as 90 (V), 10 (V) is added to the recording signal. However, since printing is performed by providing a space for two dots between the first and second rows, the first row of the second row is 160
(V) The second row and the second row are 170 (V). Similarly, for the third row, printing is performed by providing a space for two dots between the second and third rows, so that the first row of the third row is 250 (V),
The second row of the row is 260 (V). Therefore, if the second and fourth rows are the target ink particles, Vn is 190 (V).

Next, in step 202, the charging distortion is corrected. The charging distortion occurs when a predetermined amount of charge cannot be obtained due to the influence of preceding ink particles when the target ink particles 31 are charged, and causes printing distortion. Here, the effect of the charge amount of the ink particles flying two and one before the target ink particle is taken into consideration (the effect of the charge amount of the ink particles three or more before is less than 1% as a result of the experiment). Small and negligible). Therefore, the target ink is obtained by using the recording signal Vn-1 before correction of the ink particle flying immediately before, the recording signal Vn-2 before correction of the ink particle flying immediately before, and the charge distortion correction coefficients α and β. The charging distortion of the particle recording signal Vn is corrected to determine Vn '(where α and β are, for example, α = 0.2 and β = 0.05). The ink particles that fly before the target ink particles 31 are ink particles printed in three rows and three rows, but Vn-1 = 0 (V) because they are not printed here. Next, the target ink particles 3
The ink particles flying immediately before the one are ink particles printed in four rows in one row, and Vn−2 = 100 (V). Therefore, the recording signal Vn ′ of the target ink particle after the correction of the charging distortion is obtained.
Is Vn ′ = 210 + 100 × 0.05 = 215 (V).

Next, at 203, a correction coefficient γp determined in advance in accordance with the presence or absence of printing of ink particles (character pattern).
Is used to correct the recording signal Vn 'to obtain V ", and V" is used as the recording signal of the target ink particle. Here, it is necessary that the dot position of the target ink particle 31 does not change depending on the state of the ink particle 32. For that, for example,
In accordance with the state of the ink particles 32, the printing distortion changes with respect to the dot position of the target ink particle 31 by the dot diameter (about 0.35 m).
γp is determined so as to be within approximately 30% of m).

In this embodiment, in which only one row and four lines are printed in the ink particles 32, γp was 0.98. Therefore, V ″ of the target particle 32 is V ″ = 215 (V) × 0.98 =
210.7 (V).
1 as the last recording signal. The same may be performed for each ink particle. Note that the processing time can be shortened by recording each correction coefficient in advance in the memory unit of the control device in a table format for each condition and reading it out as necessary.

As described above, by correcting the target ink particles, high-speed, high-quality characters can be obtained with a small correction coefficient even when the printing distance is long.

Next, assuming that the ink particles in the third row and the fourth row in FIG. 1 are the target ink particles, in addition to the flying adjacent ink particles (two rows and four rows, and one row and five rows), the adjacent ink particles in the print matrix are adjacent. Using the ink particles of three rows, two rows, three rows, three rows, and three rows, five rows of dots, the correction coefficient is determined according to the above-described procedure based on whether or not the ink particles are printed, the amount of charge, and the like.

Further, assuming that the ink particles to be printed in the first row and four rows are the target ink particles, the ink particles for determining the correction coefficient are one row and two rows, one row and three rows, three rows and three rows, and two rows and four rows. It is determined from the presence / absence of printing of ink particles to be printed in five rows per row, and the respective charge amounts. Note that a specific method of obtaining the correction coefficient is based on the method of FIG. 17 described above.

FIG. 3 shows the first column, third row, four rows to the second column, second row, three rows.
The flying state of the ink particles printed on the line is shown, and FIG. 4 shows the arrangement of each dot matrix.

Assuming that the target ink particles 81 are ink particles to be printed in the first column and the first row of the second column, the ink particles 82 used for obtaining the correction coefficient are indicated by oblique lines. The ink particles 82 in this embodiment are printed on the first column, three rows, seven rows, the second column, two rows, one row, and the second column, one row, two rows. , Attention ink particle 8
A correction amount of 1 is determined.

Next, when the ink particles to be printed in the second column, the second row, and the second row are the target ink particles, the ink particles used for obtaining the correction coefficient are as follows. 2nd column, 2nd row, 1st row, 2nd column, 1st row, 2rows, 2nd column, 3rd row, 2rows, 2nd column, 2nd row, 3rd row
From the presence or absence of the ink particles printed on the line and the charge amount,
The correction coefficient of the target ink particle in the second column, second row, and second row is obtained. The method of obtaining the correction coefficient and the like is performed according to the above-described procedure.

When the ink particles in the first column, the third row, and the seventh row are used as the target ink particles, the ink particles used for the correction are 1
The third row, five rows, the first column, three rows, six rows, the first column, two rows, seven rows, and the second column, one row, one row are used. That is, a correction coefficient of the ink particles of the first column, the third row, and the seventh row, which are the target ink particles, is obtained based on the presence or absence of printing of the ink particles used for the correction and the charge amount.

Next, when the ink particles to be printed in the first column, second row and seven rows are used as the target ink particles, the ink particles used for obtaining the correction coefficient are as follows. 1st row 2
Using the ink particles printed on the fifth row, the first column, the second row, the sixth row, the first column, the first row, the seventh row, and the first column, the third row, the seventh row, the presence or absence of the printing of the ink particles and the charge amount Thus, the correction coefficient of the target ink particle is determined.

Further, when the ink particles to be printed in the second column, the third row, and the first row are the target ink particles, the ink particles used for the correction coefficient are as follows. The ink particles used for the correction are as follows: 2nd column, 2nd row, 1st row, 2nd column, 1st row, 2nd row, 2nd column, 3rd row, 2nd row
It is printed on the line, the presence or absence of printing of this ink particle,
The correction coefficient of the target ink particle is obtained from the charge amount.

When the ink particles to be printed in the second column, the first row and the second row are the target ink particles, the ink particles used for obtaining the correction coefficient are as follows. The ink particles used for the correction are printed on the second column, the first row, the first row, the second column, the third row, the first row, the second column, the second row, the second row, and the second column, the first row, the third row. The correction coefficient of the target ink particle is determined based on the presence / absence of printing and the charge amount.

As described above, according to the present invention, with respect to the target ink particles printed on each dot matrix, the ink particles flying before and after the target ink particles, and the upper and lower dot matrices in the deflection direction of the target ink particles. By determining the correction coefficient of the recording signal according to the charged state of the ink particles, high-speed and high-quality characters can be obtained even when the printing distance is long. In addition, if the number of ink particles to be further divided into conditions is increased, for example, an ink particle flying two before the target ink particle, an ink particle flying two behind the target particle,
, Printing with higher image quality can be obtained, but the classification of conditions for obtaining the correction coefficient becomes enormous.

Next, between the ink particles in the first and second rows,
The case where dummy particles are present will be described.

FIG. 5 shows that the first column, 3rd row, 4th row to the 2nd column, 3rd row, 2nd row
The flying state of the ink particles printed on the line is shown, and the case where one dummy particle 23 is present between the ink particles in the first and second columns is shown.

In addition to the ink particles corresponding to the printing dots,
The reason for providing the dummy particles is that the dummy particles are not normally charged and are collected as they are in the gutter 14, and the target ink particles are provided in order to minimize the influence of the ink particles corresponding to the adjacent print dots, For this reason, the number of ink particles used for correcting the target ink particles can be reduced.

In FIG. 5, the ink particles 88 used to calculate the correction coefficient for the target ink particles 87 to be printed in the first column, the third row, and the seventh row are indicated by oblique lines. FIG. 6 shows dot positions where the target ink particles 87 and the ink particles 88 are printed. In this embodiment, the ink particles 88 used for obtaining the correction coefficient are printed on the first column, three rows and five rows, the first column, three rows and six rows, and the first column, two rows and seven rows.
The correction coefficient of the target ink particle 87 is determined based on whether or not the ink particle 88 is printed and the amount of charge.

In the above example, the ink particles before the dummy particles are used as the target ink particles. However, the ink particles behind the dummy particles are used as the target ink particles, that is, the second column, the first row and the first row are used. Assuming that the ink particles are ink particles used for determining the correction coefficient, ink particles printed on the second column, second row and first row, and the second column, first row and second row are used. A correction coefficient for the target ink particle is determined based on whether or not the ink particle is printed and the amount of charge.

In the above-described embodiment, the case where there is one dummy particle 23 between the ink particles in the first and second columns has been described. However, even if there are two or more dummy particles 23, the correction coefficient is obtained. There is no problem above.

As described above, according to the present invention, when dummy particles are present between rows, printing is performed by dividing the correction coefficient condition using only ink particles in the same row as the row on which the target particles are printed. Even when the distance is long, a high-speed and high-quality character can be obtained with a small correction coefficient.

Next, a description will be given of a case where printing (hereinafter, referred to as thinning-out) is performed while placing dummy particles between ink particles involved in printing. However, when thinning is performed as in the present embodiment, the printing speed decreases.

FIG. 7 shows the flying state of the ink particles printed on the second row and the second row to the second row and the fifth row, and the dummy particles 23 are inserted one by one between the ink particles. FIG.
Indicates a target ink particle and a printing position of the ink particle for obtaining the correction coefficient thereof, and is used for obtaining a correction coefficient of the target ink particle 41 (black circle) printed in two rows and four lines. The ink particles 42 are indicated by oblique lines.
In this embodiment, the ink particles 42 used for correcting the target ink particles 41 are those printed in two rows and two rows, two rows and three rows, and two rows and five rows. Based on the presence or absence of printing of the ink particles 42 and the charge amount, the correction coefficient of the target ink particles 41 is obtained by the above-described method.

As described above, according to the present invention, when thinning is performed, even when the printing distance is long, it is small even when the printing distance is long, without considering the ink particles flying before and after, which was considered when there is no thinning. High-quality characters can be obtained with the correction coefficient. In addition, if the number of ink particles to be further classified is increased,
For example, the number of ink particles flying before and after the particle of interest and the number of correction coefficients increase, and higher-quality printing can be obtained, but the time required to obtain the correction coefficients increases.

Next, a case in which the dot matrix forming one character is 7 dots vertically and 5 dots horizontally and two characters are printed in the deflection direction (hereinafter referred to as two-stage printing) will be described.

The configuration of the dot matrix in this embodiment is such that there is no third stage out of the three stages in FIG. The scanning method of printing is as follows. First, printing is performed at the dot position of one column, one row and one row, secondly, printing is performed at the dot position of one column, two rows and one row, and thirdly, dot position of one column, one row and two rows In the dot matrix arranged in the deflecting direction, such as printing at the dot position on the fourth row, two rows and two rows, and printing on the fifth dot position on the one column, one row and three rows. Printing is performed in order and from the lowest dot of each dot matrix. When printing on the first column is completed, the same scanning method
Print from the column onward.

FIG. 9 shows the flying state of the ink particles printed on the first row and the first row to the second row and the seventh row. Are shown by oblique lines. FIG. 10 shows the dot positions where the target ink particles 37 and the ink particles 38 are printed. The ink particles 38 used for obtaining the correction coefficient in this embodiment are two rows and two rows,
Printing is performed in three rows, one four rows, one five rows, and two five rows. The correction coefficient of the target ink particle 37 is obtained based on the presence / absence of printing of the ink particle 38 and the charge amount.

Next, assuming that the ink particles to be printed on the first and third rows are the target ink particles, the ink particles used for obtaining the correction coefficient are the first and second rows, the first and third rows, and the second and third rows.
The ink particles are printed in rows, two rows, four rows, and one row, five rows. The correction coefficient of the target ink particles (the ink particles in the first row and three rows) is obtained based on the presence / absence of printing of the ink particles and the charge amount.

As described above, according to the present invention, it is possible to obtain high-quality characters at high speed even when the printing distance is long by limiting the ink particles for obtaining the correction coefficient as in the case of three-stage printing. it can. Even in the case where dummy particles are present between thinning and rows, a correction coefficient may be obtained in the same manner as in three-step printing.
Here, an example in which two-stage and three-stage printing is performed has been described, but even in four-stage printing and higher, high-speed, high-quality printing can be performed by specifying ink particles for calculating a correction coefficient. Even if the dot matrix forming the character changes, by specifying the ink particles for calculating the correction coefficient in the same manner, high-speed and high-quality printing can be performed even when the printing distance is long.

Next, when a dot matrix constituting one character is 7 dots vertically and 5 dots horizontally, and one character is printed in the deflection direction (hereinafter referred to as one-stage printing), a correction coefficient is obtained. How to select ink particles will be described.

The configuration of the dot matrix in this embodiment is such that only the first stage is used without the second and third stages in FIG. The scanning method of printing is as follows: first, printing is performed at the dot position of one column, one row, one row, second, printing is performed at the dot position of one column, one row, two rows, and thirdly, printing is performed at the dot position of one column, one row, three rows In the direction of deflection from the lowest dot position in the dot matrix, such as printing at the dot position on the 4th row, 1st row, 4th row, and printing on the 5th, 1st row, 1st row, 5th row. 1
Printing is performed dot by dot. When the printing of the first column is completed, the second and subsequent columns are printed by the same scanning method as that of the first column.

FIG. 11 shows the flying state of the ink particles printed in the first row and the first row to the first row and the seventh row, and the ink particles used for the condition classification of the correction coefficient of the target ink particle 61 printed in the first row and the fifth row. 62 is indicated by oblique lines. FIG. 12 shows the dot positions where the target ink particles 61 and the ink particles 62 are printed. The ink particles 62 of this embodiment have one row and one row,
The printing is performed on the first row, the second row, the first row, the third row, the first row, the fourth row, the first row, the sixth row, and the first row, the seventh row, and the correction coefficient of the target ink particle 61 is obtained from the presence / absence of the printing of the ink particle 62 and the charge amount. Can be

FIG. 13 shows the flying state of the ink particles printed on the first column and first row from the first column to the second column and first row on the seventh row. The ink particles 64 used to classify the condition of the correction coefficient are shown by oblique lines.
FIG. 14 shows the dot positions where the target ink particles 63 and the ink particles 64 are printed. In this embodiment, the ink particles 64 are in the first column, one row, six rows, the first column, one row, seven rows, the second column, one row, one row, the second column, one row, two rows, the second column, one row, four rows, Row 1
The printing is performed in the fifth row, and the correction coefficient of the target ink particle 63 is classified according to whether or not the ink particle 64 is printed.

As described above, according to the present invention, ink particles that affect the printing distortion of the target ink particles are taken into account, and high-quality characters can be obtained at high speed with a small number of conditions even when the printing distance is long. Can be. In addition, if the number of ink particles to be further classified is increased, printing with higher image quality can be obtained, but the classification of correction coefficients becomes enormous.

Next, a case where thinning is performed will be described.

FIG. 15 shows the flying state of the ink particles printed on the first row and the first row to the first row and the seventh row. There are dummy particles 23 between the ink particles, and the target ink printed on the first row and the fifth row is shown. The ink particles 72 used for obtaining the correction coefficient of the particles 71 are indicated by oblique lines. FIG. 16 shows the target ink particles 7.
1 and the dot position at which the ink particles 72 are printed. In this embodiment, the ink particles 72 have three rows per row,
The printing is performed in the fourth row and the sixth row, and the correction coefficient of the target ink particle 71 is obtained based on the presence or absence of the printing of the ink particle 72 and the charge amount.

As described above, according to the present invention, when thinning is performed in obtaining the correction coefficient, the correction is performed in consideration of only the ink particles that affect the printing distortion of the target ink particles. Even when the distance is long, high-speed and high-quality characters can be obtained.

[0053]

According to the present invention, even when the printing distance is long, high-quality printing with reduced printing distortion during high-speed printing can be performed with a small correction coefficient.

[Brief description of the drawings]

FIG. 1 shows a flying state of a target ink particle and an ink particle used for determining a correction coefficient.

FIG. 2 shows a dot position of an ink particle of interest and an ink particle used for determining a correction coefficient.

FIG. 3 shows the flying state of the target ink particles and the ink particles used for determining the correction coefficient at the line transition.

FIG. 4 shows a dot position of a target ink particle and a dot position of an ink particle used for determining a correction coefficient at a column transition.

FIG. 5 shows a flying state of a target ink particle and a flying state of an ink particle used for determining a correction coefficient in a case where a dummy particle is present at a line change.

FIG. 6 shows a target ink particle and a dot position of an ink particle used for determining a correction coefficient when a dummy particle is present at a line change.

FIG. 7 shows a flying state of ink particles when dummy particles are provided every other dot.

FIG. 8 shows the dot positions of the target ink particles and the ink particles used for determining the correction coefficient when the dummy particles are provided every other dot.

FIG. 9 shows the flying state of the target ink particle and the ink particle used for determining the correction coefficient in the case of the two-stage configuration.

FIG. 10 shows a dot position of a target ink particle and a dot position of an ink particle used for determining a correction coefficient in a two-stage configuration.

FIG. 11 shows the flying state of the target ink particles and the ink particles used for determining the correction coefficient when printing only one stage.

FIG. 12 shows dot positions of target ink particles and ink particles used for determining a correction coefficient when only one stage is printed.

FIG. 13 shows a flying state of ink particles of interest and ink particles used for determining a correction coefficient when straddling a row when printing is performed in only one stage.

FIG. 14 shows dot positions of target ink particles and ink particles used for determining a correction coefficient in two rows in one row.

FIG. 15 shows the flying state of ink particles when using dummy particles when printing only the first stage.

FIG. 16 shows a target ink particle and a dot position of an ink particle used for determining a correction coefficient when dummy particles are used when printing only one stage.

FIG. 17 shows a procedure for correcting a target ink particle.

FIG. 18 shows a state of a three-stage inter-dot trick.

FIG. 19 shows a schematic configuration of an ink jet recording apparatus of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Ink tank, 2 ... Supply pump, 3 ... Pressure regulating valve, 4 ...
Injection nozzle, 5: electrostrictive element, 6: excitation source, 7: ink particle, 8: charging electrode, 9: charging voltage generation source, 10: upper deflection electrode, 11: lower deflection electrode, 12: high voltage power supply, 13 ...
Recording medium, 14: gutter, 23: dummy particles.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Nobuhiro Harada 1-1-1, Higashitaga-cho, Hitachi City, Ibaraki Prefecture Inside the Electrification Equipment Division of Hitachi, Ltd. No. 1 in the Electric Equipment Division of Hitachi, Ltd.

Claims (9)

[Claims] A nozzle for ejecting ink particles; a signal generating means for generating a recording signal corresponding to recording information; a charging electrode for charging the ink particles; and a deflecting direction of the ink particles charged by the charging electrode. Deflecting electrodes for printing a plurality of stages of characters / symbols composed of a plurality of dot matrices in the direction of deflection of the ink particles. In an ink jet recording apparatus for performing printing by relatively moving a recording medium in a direction substantially perpendicular to the direction of the deflection, an ink particle flying before and after a target ink particle for correcting a recording signal; Correction of the target ink particles based on the charge state of ink particles to be recorded above and below the target ink particles on the stage where the particles are printed or the presence or absence of printing An ink jet recording apparatus for determining a value or a correction coefficient. 2. A nozzle for ejecting ink particles, a signal generating means for generating a recording signal according to recording information, a charging electrode for charging the ink particles, and a deflecting direction of the ink particles charged by the charging electrodes. Deflecting electrodes for printing a plurality of stages of characters / symbols composed of a plurality of dot matrices in the direction of deflection of the ink particles. In an ink jet recording apparatus that performs printing by relatively moving the recording medium in a direction substantially perpendicular to the direction of deflection, the ink particles that fly continuously before and after the target ink particles for correcting the recording signal In the dot matrix on which the target ink particles are printed, the charge state of the target ink particles and the ink particles to be printed on dots consecutively above and below the target ink particles or An ink jet recording apparatus according to claim 1, wherein a correction value or a correction coefficient for correcting the recording signal of the target ink particle is obtained depending on whether or not printing is performed. 3. A nozzle for ejecting ink particles, a signal generating means for generating a recording signal according to recording information, a charging electrode for charging the ink particles, and a deflecting direction of the ink particles charged by the charging electrodes. Deflecting electrodes for printing a plurality of stages of characters / symbols composed of a plurality of dot matrices in the direction of deflection of the ink particles. In an ink jet recording apparatus for printing by relatively moving the recording medium in a direction substantially perpendicular to the direction of the deflection, a dot matrix in which the target ink particles for correcting the recording signal are printed is moved in the deflection direction by two times. A first ink particle that is printed on a dot matrix that is spaced apart from the first ink particle and that flies in front of the target ink particle; A second ink particle which is printed in a dot matrix separated by one from the dot matrix in the deflection direction and which flies in front of the target ink particle; and an ink which flies between the first ink particle and the target ink particle An ink jet recording apparatus, wherein a correction value or a correction coefficient for correcting a recording signal is obtained based on a charged state with particles or presence / absence of printing. 4. A nozzle for ejecting ink particles, a signal generating means for generating a recording signal according to recording information, a charging electrode for charging the ink particles, and a deflecting direction of the ink particles charged by the charging electrodes. Deflecting electrodes for printing a plurality of stages of characters / symbols composed of a plurality of dot matrices in the direction of deflection of the ink particles. In an ink jet recording apparatus that performs printing by relatively moving the recording medium in a direction substantially perpendicular to the direction of the deflection, ink particles that fly immediately before a target ink particle that corrects a recording signal An ink droplet flying one position behind the target ink particle, and a dot separated from the dot matrix on which the target ink particle is printed by two in the deflection direction. An ink particle which is printed on a matrix, and which flies in front of the target ink particle, and which is printed on a dot matrix separated by one in a deflection direction from a dot matrix on which the target ink particle is printed, and The charged state of the ink particles flying before and the dot matrix on which the target ink particles are printed, and the ink particles printed on a dot matrix separated by one in the deflection direction and flying after the target ink particles, An ink jet recording apparatus, wherein a correction value or a correction coefficient for correcting a recording signal is obtained based on whether or not printing is performed. 5. A nozzle for ejecting ink particles, a signal generating means for generating a recording signal according to recording information, a charging electrode for charging the ink particles, and a deflecting direction of the ink particles charged by the charging electrodes. Deflecting electrodes for printing a plurality of stages of characters / symbols composed of a plurality of dot matrices in the direction of deflection of the ink particles. In an ink jet recording apparatus for performing printing by relatively moving the recording medium in a direction substantially perpendicular to the direction of the deflection, an ink particle not used for printing is placed between ink particles used for printing. When performing the recording, the recording signal is corrected according to the charge state of the ink particles or the presence or absence of printing at the same stage of the dot matrix where the target ink particles for correcting the recording signal are printed. An ink jet recording apparatus characterized by obtaining a correction value or the correction coefficient for correcting. 6. A nozzle for ejecting ink particles, means for generating a recording signal according to recording information, a charging electrode for charging the ink particles, and a deflecting electrode for deflecting the flying direction of the charged ink particles. In the ink jet recording apparatus for performing printing, characters and symbols comprising a dot matrix in the direction of deflection of the ink particles, the recording medium is relatively moved in a direction substantially perpendicular to the direction of deflection, at least the recording signal The recording signal of the target ink particle is corrected according to the charge state of the four ink particles flying before the target ink particle to be corrected and the two ink particles flying behind the target ink particle or the presence or absence of printing. An ink jet recording apparatus for obtaining a correction value or a correction coefficient. 7. A correction method according to claim 1, wherein a recording signal is corrected in accordance with a charged state of ink particles or presence / absence of printing in the same dot matrix row in a deflection direction including a dot matrix on which the target ink particles are printed. An ink jet recording apparatus for determining a value or a correction coefficient. 8. An ink-jet apparatus according to claim 1, wherein a recording signal of said target ink particle is corrected for a charging error at the time of charging, and then the recording signal is corrected by said correction value or correction coefficient. Recording device. 9. A method of charging an ejected ink particle according to a recording signal corresponding to recording information, deflecting a flying direction of the charged ink particle, and changing the stage into a dot matrix for each stage. Are sequentially deflected one by one, and the recording medium is relatively moved in a direction substantially perpendicular to the direction of the deflection. In the recording method of the ink jet recording apparatus, the recording signal is corrected from the printing information of the target ink particles for correcting the recording signal. A first step of determining the charge amount; and correcting the charge amount of the target ink particle from information on the charge state of the ink particle printed vertically adjacent to the determined target ink particle and the presence / absence of printing. Step 2, the charge amount of the target ink particle determined in the second step is determined by the charge amount of the ink particle flying before and after the target ink particle, and the presence or absence of printing. Recording method for an ink jet recording apparatus characterized by performing correction and a third step of correcting Flip.