KR820000172B1 - Corrective of crooked printing letter - Google Patents

Abstract

In an ink jet system printer of the charge amplitude controlling type for recording characters in a dot matrix pattern by a sequence of charged drops, it is concerned with distortion minimization of printing characters. Predetermined compensation values for charge drops stored in memory (5) are selected in accordance with the information of the charge amplitude of the preceding ink drops and character conditions. The selected compensation values from memory control the amplitude of charge for the specific ink drops to thereby compensate any charge distortion.

Description

Skew Correction Method

1 is an explanatory diagram for explaining the state of ink particles in the present invention.

2A and 2B are explanatory diagrams for explaining the factor skew of ink particles in in-phase;

3 is an explanatory diagram of a memory device for obtaining corrected outgoing of the print skew in the present invention.

4 is an appendix diagram for explaining an embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method for correcting a skew of a print of a charge-controlled ink jet printer, and in particular, to obtain a quality of a high speed factor while correcting a skew of a print. There is a purpose.

In general, the configuration of the charge-controlled inkjet printer will be briefly described, in which ink supplied by pressurization at a constant pressure in an ink supply system is ejected from a nozzle to form ink particles, and the ink particles form a charged electrode. When passing through), the desired charge is made and while passing through the electrode, it is deflected according to the amount of charge and collides with the recording paper to print the desired letter to form the letters on the dot. .

On the other hand, of the ink particles, unnecessary ink particles that do not contribute to printing are recovered from the unnecessary ink recovery device without being charged and deflected and passed to the ink supply system when passing through each electrode.

In the charge control inkjet printer as described above, in order to obtain a good print, the warp and the like generated in the ink particles are corrected at the time of charging in advance to form a predetermined dot. For example, in the related art, the ink particles ejected from the nozzles are charged one by one, and the distortion of the printing factor is reduced in the charging process, or the influence of the ink particles which is performed beforehand is linearly corrected with respect to the charging level of the ink particles. In order to compensate for this, the skew of the factor is pressed.

Any of these can be effectively printed to some extent when the number of used dots (ink particles) per character is 5x7 or 7x9.

However, in order to increase the printing speed and achieve high factor quality, it is necessary to increase the dot matrix of Chinese characters to about 22 × 22, 32 × 32, etc. In this case, there is a skew that is not corrected by the correction method described above. Stand out.

For example, in order to make a high speed factor, it is very unnecessary to charge ink particles one by one, and it is necessary to charge all the necessary dots (ink particles).

In addition, in order to obtain high factor quality, the use dot, that is, ink particles, needs to be smaller than conventional ink particles.

Therefore, compared with the prior art, the ink particles are more affected by scattering and have difficulty in colliding the ink particles at a desired position.

In the present invention, three kinds of the preceding four dots of the ink particles to be charged, one subsequent dot, the row direction of the ink particles to be corrected, and the character size in printing to obtain high speed or high factor quality. With respect to the data, the amount of distortion is experimentally determined to determine the amount of correction of the distortion, and the amount of correction of the distortion is stored in the storage device so that the correction of the complete distortion of the ink particles is realized.

The main object of the present invention is to obtain a record of high printing quality without falling down in printing speed as described above.

In particular, about 32 × 32 dot matrixes are required to print Chinese characters of Myungjo bodies (thick Chinese characters with thick strokes).

Or the swelling of the thickness of the distinctive line of the Myeongjo body requires extremely detailed reproducibility.

For example, the acceptable safety limit for dots of 16 points (hereinafter referred to as point P) is 20 μm.

In other words, when it is skewed more than 20 micrometers, the loss of the longitudinal and horizontal linearity which comprises a character, and the loss of parallelism are visually felt.

Therefore, when printing the 16P type, the minimum amount of skew correction is

If the character size is 5.44 (16P), it becomes 0.37%.

Therefore, in the embodiment described below, the minimum amount of skew correction is 0.3%.

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On the other hand, the skew of the factor due to the influence of the preceding subsequent particles was found to be the above-described factor skew of about 20 μm by determining the correction amount for the preceding 4 dots and the subsequent 1 dot by separate measurement. In this case, when a higher precision factor is required, the correction amount of the charge amount skew can be determined in consideration of the influence of the preceding 4 dots or more and the subsequent 1 or more dots. It becomes

Alternatively, the minimum amount of skew, which is output data, may be 0.3% or less, which also increases the output data.

In the embodiment of the present invention, the minimum amount of the skew correction is set to 0.3%, and the correction amount is determined in consideration of the influence of the preceding 4 dots and the subsequent 1 dot.

In examining the amount of skew here, if we classify the cause

(1) war skew,

(2) skew due to coulomb force between charged particles in scattering;

(3) There are three aerodynamic skews.

As shown in FIG. 1, the charge distortion causes a video signal 3 to be applied between the charging electrode 1 and the nozzle 2 to charge the ink particles D _{0 which} are about to be granulated. At this time, it is charged by the video signal (3), but when the preceding particles D ₁ , D ₂ , D ₃ ‥‥‥‥ have a charge, the charged particles D ₁ , D ₂ , D _{3 ...} This is because the charged field of the ink particles D ₀ is disturbed and the normal amount of charge cannot be charged.

The skew caused by the coulomb rejection between charged particles during the flight is shown in FIG. 2a.

(Where r (t) is the distance of ink particles Dn to Dn _{+ 1} at time t).

Or fn (t) acting on the ink particles Dn in FIG.

(Where rni (n ≠ i) is the distance between the ink particles Dn and Dn + i).

The flight trajectory is changed by the fn (t) to cause a bad skew.

Again, the aerodynamic skew is the skew caused by the incorrect air resistance of the preceding ink particles and subsequent ink particles.

That is, particles that fly alone (no preceding particles) are subject to relatively large air resistance because they move through the air in a stationary state, and these and subsequent particles are in the air stream created by the preceding particles. As it proceeds, it can be easily expected that the air resistance will be less than that of the preceding terminal.

However, this flow becomes a stream of vortices, so accurate theoretical interpretation is generally impossible to interpret.

In the present invention, as a result of investigating the skew of the factor with respect to the various dot arrangements, it has been found that the three skews cannot be measured independently, and thus the skew due to (1), (2), and (3) is comprehensively integrated. I knew it.

In other words, by setting various patterns and measuring the amount of skew at the printing surface based on the preceding and subsequent dots, the overall skew of (1), (2), and (3) is eliminated. Let me know.

The setting of the pattern by the combination of the preceding 4 dots and the following 1 dot is different depending on the character size and the dot level of the 32x32 matrix.

Therefore, the combination of the preceding 4 dots, the following 1 dot 2 ⁵ , the letter size (4 types such as 9P, 12P, 14P, 16P in the embodiment of the present invention) 2 ² and the system 2 of the combination 2 ^{5 in} the dot level ^Twelve patterns were examined to determine the amount of skew in the print surface.

For this reason, in the present invention, it is possible to obtain accurate information (skew) more realistically without measuring (1), (2) and (3) individually. On the basis of the above measurement results, it was necessary to correct the amount of distortion of up to 4.5%.

Therefore, since the minimum amount of correction of the skew is 0.3%, 16 kinds of corrections, such as 0.3, ..., 4.2, 4.5, are required.

Here, FIG. 3 shows an appendix of a storage device, which is the gist of the present invention. In this figure, 5 denotes a storage device.

This memory device 5 has 5 feet (5a), 5 feet (5b) of data of a preceding 4 dots, a subsequent 1 dot, and a signal 2 feet (5c) indicating character size in a low counter of the matrix described below. 4 feet of corrected output are derived in each of the above-described input states.

In this embodiment, this correction output is converted into an analog signal, and a charging voltage (video signal) obtained from the ink particles D ₀ shown in FIG. 1 is applied between the nozzle 2 and the charging electrode 1. .

That is, the storage device 5 stores the amount of skew in the pattern formed by the combination of 2 and ¹² described above. For example, when the dot is formed at the 20th stage of the first core of 32 × 32 dot matrix, the input signal of “10100” (the 0th stage to the 31st stage) is input to the first input terminal 5a. do.

On the other hand, when the _first particles D ₁ , D ₂ , D ₃ , D ₄ and subsequent particles D_ ₁ of the ink particles D ₀ forming the 20th stage need to form dot rows, respectively, the second input terminal The signal of “11111” is input to 5b. If the character size is 9p, a signal of "00" is input to the input terminal.

As described above, when the signal input to the storage device 5 is determined, it will be understood that the storage device 5 derives the correction output of the distortion corresponding to the input state at this time.

In other words, the character size is set to "01" in the 12p character size, "10" in the 14p, and "11" in the 16p.

Next, an embodiment of the present invention will be described as an appendix of FIG. 4 for practicing the present invention.

In FIG. 4, 14 is a storage device for storing each character pattern, and the 32-digit matrix scum counter 12 and 32-digits operated by the matrix counter group 11 at its input unit. The signal is input from the matrix low counter 13.

That is, the matrix column counter 12 selects a 32 × 32 dot matrix column, and the matrix row counter 13 selects a row, and from each of these counters 12 and 13, The character pattern memory selects the current dot level according to the signal.

The character pattern memory 14 receives character data as input. At this time, the character pattern storage device 14 determines whether or not the dot is necessary according to the character data, and outputs the signal.

The output signal is input to the character array register 16, and the character array register 16 is a sihoo register star capable of reading a six-foot parallel array.

Each preceding particle D ₁ , D ₂ , D ₃ , D ₄ to Register 16 + 1-16 + 4 and subsequent particle D_ ₁ to Registera 16-1 and particle D ₀ to be charged now. I remembered it at 0 so that I could know the state at that time.

For example, if the content of the register 16 is " I ", it indicates whether or not it is charged or a particle factor requiring charging.

On the other hand, a total of 5 feet of the output of 4 feet of the preceding dot of the register 16 and the output of 1 foot of the subsequent dot is input to the skew correction storage device 5. The above-described skew correction storage device outputs from the 32-digit matrix low counter 13 which selects the output signal and the row from the register 15 for setting the character size as described in FIG. A signal is input, and a 4-foot skew correction signal 17 is output by these signal input states.

The skew correction signal 17 is input to the analog switch 21, and the analog switch 21 outputs an analog signal corresponding to the signal 17 at that time, and adds the signal to the add amplifier ( 22).

19 shows a signal from the analog switch 18 which inputs a signal from the character size register 15 as an D-A combinator and outputs an analog signal corresponding to the signal, and a matrix low. The digital signal from the counter 13 and the one-foot data signal from the character array register 16 are inputted to form a dot level video signal that is a basis for a video signal corresponding to the case where there is no distortion. It is input to the liver acid amplifier 22.

In addition, a gamma level signal (analog signal) is formed by the gatha level setting circuit 20 by a one-fit DATA signal from the character array register 16.

Here, the addition amplifier 22 is a skew correction signal at the analog switch 21, a dot level proportional signal at the D-A combiner 19, and a signal at the other level setting circuit 20. In addition, the addition signal is output as the video signal 24 through the amplifier 23.

The video signal 24 is a signal applied between the nozzle 2 and the charging electrode 1 shown in the first drawing.

That is, the video signal 24 is for charging the ink particles indicated by the register 16-0 of the character array register 16.

As described above, by correcting the video signal 24, the ink particles can be made to collide precisely with the printing surface, the printing quality can be improved, and all the ink particles formed can be fully charged. Is possible.

The analog switch 21 causes the video signal 24 to be fed back, thereby outputting a signal for correcting the skew.

In addition, in this embodiment, although 32x32 dot matrix is demonstrated, this matrix can be implemented similarly in what kind of shape, for example, when forming the 5x7 dot matrix character, More accurate dot characters can be formed.

In general, this apparatus is designed to print characters that are read in the direction of movement of the nozzle. For example, when the printing of a seed paper is to be made, the apparatus shown in FIG. The counter contents of the counter 12 and the low counter 13 are connected in reverse, and the state at this time is input to the character pattern memory 14.

The storage device 5 may be configured as a lead or only a so-called ROM, and may also be configured as a purguragama or a logic sphere.

As described above, the present invention provides a storage means for setting all the patterns, obtaining the skew generated at this time, and outputting a signal for correcting the skew, and converting the video signal by the signal from the storage means. It is to calibrate.

All the skews can be corrected, high-speed factor can be provided, and at the same time, a printer that can form a high-quality character pattern can be provided.

In addition, although the present embodiment has described that printing can be performed by one nozzle, when printing as a plurality of nozzles, for example, a line printer, 135 units, the above storage means is sufficient as one and several It is especially good when processing parallel signals as a nozzle and writing several characters at the same time.

Claims (1)

Charge quantity control type inkjet which gives charge corresponding to recording signal to ink particles, passes through static electricity, deflects each ink particle according to the amount of charging charge, and records symbols such as letters by dot matrix In the printer, a correction value set in order to minimize the overall skew due to the electrical conditions between the continuous charged particles and the air resistance occurring during the scattering of the ink particles during charging of the ink particles is stored in the storage unit, and contributes to the printing factor. It is possible to select and derive the contents of the above storage unit by inputting printing information such as the charged state and the printing state of continuous ink particles with respect to the ink particles, and controlling the amount of charge of the ink particles contributing to the factors as the derived correction value. Correction of the skew of the factor.

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