JPH01235654A - Recording - Google Patents

Abstract

PURPOSE:To eliminate white streaks by making the interval, that is, an interconnection, between dots printed in different recording sections smaller than the interval between dots printed in the same recording section. CONSTITUTION:Recording is performed by using an interval between an upper and a lower nozzle which is n times an interval between dots, n is the number of dots between the upper and lower nozzles. The dot interval is to be set so that the dot interval B2 of an interconnection between the upper and lower nozzles is slightly smaller than a single dot interval A. The desirable allowance for the interval reduction should be equal to a maximum allowable dot interval error due to paper feed irregularity, elongation of recording paper, mechanical precision and thermal expansion of a printing head caused by temperature. This procedure allows recording density to rise slightly in the interconnection between the upper and lower nozzles; however, the slight difference is hardly visible. In addition, if B2 widens due to paper feed irregularity, white streaks which cause significant quality deterioration does not generate.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recording method using a recording apparatus equipped with a semi-multihead having a plurality of recording sections.

[Prior Art] Conventionally, there are recording devices using a thermal method, an inkjet method, an impact dot method, and the like.

The recording head used in these recording devices has a recording section (
Depending on the number of recording elements (recording elements, nozzles, recording needles, etc.), they can be divided into serial, semi-multi, and full-multi types.

Among the above recording heads, the serial type has only one recording section, so the head is simple and low cost.
Recording speed is slow.

Since the full multi-type has the number of recording units corresponding to the image size, the recording speed is fast, but the cost is high.

The semi-multi type has more recording parts than the serial type, but has fewer recording parts than the full multi-type, and is located in the middle of the two types. The semi-multi-type recording head has conventionally been most commonly used as a recording head that can solve the problems of the slow recording speed of the serial type and the high cost of the full-multi-type.

To explain the recording apparatus equipped with the above-mentioned semi-multi-type heads, FIG. 1 shows an ink-jet recording apparatus equipped with the semi-multi-type heads.

To explain the structure using FIG. 1, there is a recording paper 2 on the outside of a platen 1, and a semi-multi-type inkjet 3 is arranged in front of this recording paper 2.

This semi-multi-type inkjet head 3 has a recording paper 2
move parallel to the paper feeding direction. For each line printing, the platen 1 is rotated by a driving means (not shown), and the recording paper is moved in the vertical direction to print an image.

As shown in FIG. 2, head 3 is yellow (Y).

A total of 8 fffis of ink with two types of dye densities, magenta (M), cyan (C), and black (Bk), are ejected from nozzles in two stages, upper and lower.

Generally, it is difficult to integrate upper and lower nozzles, so if (pitch between upper and lower nozzles) = (dot pitch), the resolution will be very low.

Therefore, conventionally, in this type of semi-multihead, (pitch between upper and lower nozzles)=n×(dot pitch) is often used. Here, n is the number of dots between the upper and lower nozzles.

Figure 3 shows an ideal example of the dot arrangement as described above, where n is 8, and after repeating paper feeding at the dot pitch eight times, the dot arrangement is eight times the dot pitch. By repeating paper feeding, it is possible to print on the entire surface.

However, in the above case, in reality, due to uneven paper feeding, elongation of the recording paper, mechanical precision, thermal expansion of the head due to temperature, etc., the dot pitch is higher or lower than 1 dot pitch A as shown in Figure 4. The dot pitch B1 at the connecting portion between the nozzles was extremely thick, and only that portion appeared white, resulting in white sushi. Such white sushi was particularly noticeable when printing "dark" images, causing a significant deterioration in image quality.

[Problems to be Solved by the Invention] The present invention solves the problems of the prior art as described above, and
To provide a recording method that eliminates white smear by making the pitch between dots printed in different recording parts, that is, the pitch between dots printed in the same recording part, ie, the pitch between dots printed in the same recording part.

[Means for Solving the Problems] A first aspect of the present invention is that in a recording method using a recording device equipped with a head having a plurality of recording sections for the same color, different recording sections are used to print images adjacent to a recording paper. The present invention provides a recording method in which the pitch between printed dots is made smaller than the pitch between dots printed adjacently on recording paper by the same recording section.

A second aspect of the present invention is that, in a recording method using a recording device equipped with a head having a plurality of recording sections for the same color, the pitch between dots printed adjacently on recording paper by different recording sections is set to the same level. The pitch is smaller than the pitch between the dots printed adjacent to the recording paper by the recording section, and the size of the dots printed adjacent to the recording paper by different recording sections is the same, and the pitch between the dots printed adjacent to the recording paper by the recording section is There is a recording method that makes the dots smaller than the size of the printed dots.

[Function] With the above-described configuration, the present invention has succeeded in creating a recording method that eliminates the occurrence of white smudges by correcting dot pitch errors caused by elongation of recording paper, mechanical precision, expansion of heads, etc. due to temperature, etc. This is what I did.

[Example] Example 1゜ The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view of an inkjet recording apparatus equipped with semi-multi-heads showing an example of the present invention. Note that explanations of parts common to the conventional example shown in FIG. 1 will be omitted.

In this example, it is also possible to change the recording dot size by controlling the drive pulse waveform applied to the head to produce a gradation.

In this example, recording is performed using the above-mentioned apparatus as follows. That is, in the present invention, (pitch between upper and lower nozzles) =
Recording was performed as nx (dot pitch). In addition, n
is the number of dots between the upper and lower nozzles, and in the example of Fig. 5, n=
It is 8. As shown in Figure 5, compared to 1 dot pitch A2,
The dot pitch was set so that the dot pitch B2 at the connecting portion between the upper and lower nozzles was slightly smaller. It is preferable that the amount of reduction is the maximum of dot pitch errors due to causes such as paper feeding unevenness, elongation of the recording paper, mechanical precision, and thermal expansion of the head due to temperature. By doing this, the recording density will be slightly higher at the connection area between the upper and lower nozzles, but it will be difficult to see with the naked eye, and even if the 82 is wide due to uneven paper feeding, white spots will occur that will cause a significant deterioration in image quality. Never.

Specific considerations include: ■ Pitch between upper and lower nozzles: 3.300 mm ■ Dot pitch: 0.159 mm ■ Number of dots between upper and lower nozzles
When 21 pieces were printed, a good image was obtained without white smearing under the temperature conditions of 5°C to 40°C.

The dot pitch between the upper and lower nozzles in the above case is derived from the following equation.

The dot pitch of the connecting portion between the upper and lower nozzles = ■ - (■

Example 2 Printing was carried out under the following conditions using a recording device equipped with the same semi-multi-type inkjet head as in Example 1.

■Pitch between upper and lower nozzles: 3.320mm ■Dot pitch: 0.159mm ■Number of dots between upper and lower nozzles
When printing was carried out at a temperature of 5°C to 40°C using 21 pieces, a good image was obtained without any white smearing. In this example, (dot pitch between upper and lower nozzles) = 0
．． The dot pitch is 140 mm, which is smaller than the dot pitch produced by the same nozzle.

Example 3 Printing was carried out under the following conditions using a recording device equipped with the same semi-multi-type inkjet head as in Example 1.

■Pitch between upper and lower nozzles: 3.200mm ■Dot pitch: 0.159mm ■Number of dots between upper and lower nozzles
When printing was carried out at a temperature of 5°C to 40°C using 21 pieces, a good image was obtained without any white smearing. In this example, (dot pitch between upper and lower nozzles) =
The dot pitch is 0.020 mm, which is extremely smaller than the dot pitch produced by the same nozzle.

Example 4 Using a recording device equipped with the semi-multi-type inkjet head of Example 1, the dot pitch and number of dots are the same, and the pulse voltage applied to the head 3 is reduced only for the dots at the connection between the upper and lower nozzles. This reduced the dot size by 20%.

Images printed with this configuration did not produce white smudges from 5°C to 40°C, and the recording density at the connection between the upper and lower nozzles did not increase, resulting in extremely good images. .

Example 5: Using a semi-multi-type inkjet head recording device configured as in Example 2, the dot pitch and number of dots are the same, and the pulse voltage applied to the head 3 is reduced only for the dots at the connection between the upper and lower nozzles. The dot size was reduced by 10%.

Images printed with this configuration do not produce white smear under temperature conditions of 5°C to 40°C, and the recorded density at the connection between the upper and lower nozzles does not become high, resulting in extremely good images. was gotten.

Example 6 Using a semi-multi-type inkjet head recording device configured as in Example 3, the dot pitch and number of dots were kept the same, and only the dots at the connection between the upper and lower nozzles were reduced in size by reducing the pulse voltage applied to the head 3. was made 50% smaller.

Images printed with this configuration do not produce white smudges under temperature conditions of 5°C to 40°C, and the recorded density at the connection between the upper and lower nozzles does not become high, resulting in extremely good images. Obtained.

[Comparative Example 1] Printing was performed under the following conditions using the same semi-multi-type inkjet head recording device as in the example. In other words, ■ Pitch between upper and lower nozzles: 3.339 mm ■ Dot pitch: 0.159 mm ■ Number of dots between upper and lower nozzles: When printing was performed with 21 pieces, white smear appeared on the image under temperature conditions from 5°C to 40°C, resulting in poor quality. A great image was obtained.

In the case of this example, ■-(■×＠-■)=■-0=■, (dot pitch of connection part between upper and lower nozzles)=0
．． The dot pitch was 159 mm, which was the same value as the dot pitch produced by the same nozzle.

[Effects of the Invention] As described above, according to the present invention, it is possible to provide a recording method that allows printing without occurrence of white smudges and allows high-quality images to be changed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a recording device used in an embodiment of the present invention, FIG. 2 is a perspective view of a head in the recording device used in an embodiment of the present invention, and FIG. 3 is a perspective view of an ideal recording device. FIG. 4 shows a conventional recorded image, and FIG. 5 shows a recording method according to the present invention. 1... Plantain, 2... Recording paper, 3... Inkjet head, 4... Control box. Figure 1 Figure 2 Figure 3 Figure 4

Claims (2)

[Claims] (1) In a recording method using a recording device equipped with a head having multiple recording sections for the same color, the pitch between dots printed adjacent to the recording paper by different recording sections can be adjusted on the recording paper by the same recording section. A recording method characterized by making the pitch smaller than the pitch between adjacent dots. (2) In a recording method using a recording device equipped with a head having multiple recording sections for the same color, the pitch between dots printed adjacent to the recording paper by different recording sections can be adjusted on the recording paper by the same recording section. The size of the dots printed adjacent to the recording paper by the same recording unit is smaller than the pitch between dots printed adjacently, and the size of the dots printed adjacent to the recording paper by different recording units is the size of the dots printed adjacent to the recording paper by the same recording unit. A recording method characterized by making it smaller.