JPS60255449A - Recording control method of serial printer - Google Patents

Abstract

PURPOSE:To make the picture deterioration of the joint between recording dots of each scanning difficult to be observed, by making the end edge of the dot line capable of being formed by one scanning do not agree with the end edge of the dot line capable of being formed by other scanning. CONSTITUTION:The first stage data are successively sent from a picture memory 1. When the transfer of data is completed, a pulse is sent to a recording stage counter 6 from a timing clock generation circuit 1 and the second stage data are successively sent from the picture memory 2. The output of counter 6 is inputted into a random number generator 7. The random number generator 7 is synchronized with the timing from the clock generator 1 and sends alternative value of two or three data to a data selector 3. The data selector 3 distributes the data from the memory 2 to 0, 1, 2 of the buffer 4 according to this signal and make them be memorized.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording control method for serial printers such as video printers, CAD/CAD output terminal printers, image processing output printers, digital copying machines, etc. The present invention can be applied to printers such as a multi-level deflection type inkjet, a multi-nozzle inkjet, a multi-layer thermal transfer (line sequential direction), a needle dot type, etc., which are controlled by mold theory).

In a multilevel deflection type inkjet printer with one-digit charge amount control, the recording head is scanned in the main scanning direction while scanning the recording paper wound around the platen in a sub-scanning direction perpendicular to the main scanning direction. The recording is performed by deflecting the dots in, for example, 32 steps in the direction. When the I-scan is completed, the platen is rotated and the recording paper is moved 3 times in the sub-scanning direction perpendicular to the scanning direction of the carriage.
The carriage is fed by two dot pitches and the next carriage scan is performed.

Ideally, in such a printer, the lowest (first) recording dot in one scan and the highest (first) recording dot in the next scan.
It is desirable that the interval between the recording dots in the 32nd row) is controlled so that it is equal to the interval between other dots, and is 1 dot wide, but in reality,
There is a limit to the accuracy of the position of - and the amount of recording paper fed, and this interval will vary. As a result, the density in this area becomes high and it looks like horizontal sushi, or there is a gap that causes sushi to appear, resulting in deterioration in image quality. In particular, for white sushi, even a slight increase in this interval (about 10 μm) is easily recognized by the human eye.1 Normally, this interval is made smaller than the 1-dot-1-pitch, and two scans are performed between one edge of the drum 1. are controlled so that they overlap. However, if you do this, the recorded ink will be erased,
In the case of a color printer, a color different from the desired color may be recorded.

In order to solve the above-mentioned inconvenience, the applicant first set the paper feed amount to a desired amount that is 1/2 or less of the width of the dot row recorded in one scan, and the dot rows overlap in the width of two scans. We have proposed a recording method in which the recording of the driver 1- of the part is distributed between the 1st scan and the 2nd scan, but according to this method, although the problem is somewhat improved, the 1st and 3rd scan , between the second scan and the fourth scan, etc., and the problem could not be improved to the point where the sushi was completely unnoticeable.

Moon-m-Moss The present invention was made in view of the above-mentioned circumstances.
In particular, the recording head and the recording paper move relative to each other, printing multiple rows of dots in each scan, and the position of the recording paper is relatively moved in a direction perpendicular to this scanning direction to perform scanning. In a serial printer of the type that forms an image by repeating the above steps, this was done with the aim of making image deterioration at the junction between recording tons 1-- for each scan less noticeable.

The configuration of the present invention will be described below based on examples.

The present invention has been made based on the fact that the above-mentioned extra sushi stands out because it appears as a structural pattern on the recorded image at predetermined intervals. The edge of a row of rows (
The top and bottom edges) do not coincide with the edges of dot rows that may be formed by other scans, so that they are not perceived by the human eye as a structured pattern. Further, a portion where dot rows of two or more scans overlap are recorded separately for each scan, thereby ensuring that the recorded image is recorded as a desired image without deterioration in image quality. Furthermore, by randomly distributing the scanning amount to each scanning amount, the structural pattern is made less noticeable.

FIG. 1 is a diagram for explaining one embodiment of the recording control method according to the present invention, and white circles in the diagram indicate printed dots. This example is an example of recording 16 stages per scan, and in this example, the feed amount in the sub-scanning direction per scan is 1.
This is equivalent to 2 dot pitches. Therefore, out of 16 steps.”
The four dots each overlap the range recorded in the previous and subsequent scans. Therefore, in FIG. 1, A is an overlapping area and B is a non-overlapping area, and the dots in the A area are randomly assigned to determine in which of the two scans the dots will be recorded.

FIG. 2 is a diagram for explaining another embodiment of the present invention,
In this example, all 16 stages are distributed and recorded in 2 to 3 scanning intervals. In this way, variations in the dot recording position, feeding amount, etc. are dispersed over the entire image, and the structural The image quality deterioration caused by the pattern becomes completely inconspicuous. In addition.

In this example, when n is an integer, the feeding amount for the 3nth scan and the 3n+1st scan is 6 dots pitch, and the feeding amount for the 3n+2th scan is 7 dots pitch. An overlapping portion of two scans is allocated to one of these two scans, and an overlapping portion of three scans is allocated to one of these three scans and recorded.

In the embodiment shown above, the feeding amount for each scan is approximately the same, but the edges of the recording range for each scan must match the edges of the recording range for other scans. For example, similar effects can be obtained even if the feeding amount is greatly changed. Similarly, the feeding amount may not be fixed, but may be changed randomly.

FIG. 3 is a diagram showing an example of an electric circuit for implementing the present invention shown in FIGS. 1 and 2. In the figure, ■ is a timing clock generation circuit, 2 is an image memory, and 3 is a data A selector, 4 is a buffer, 5 is a controller, 6 is a recording stage counter, and 7 is a random number generator.The portion of the buffer circuit 4 indicated by a dotted line is necessary when implementing the embodiment shown in FIG. This is unnecessary when implementing the embodiment shown in FIG.

Next, the embodiment shown in FIG. 2 will be described with reference to FIG. In FIG. 3, the image to be printed is stored in the image memory 2. For example, if the printer is of a binary type with recording and non-recording for each drum 1-, the image to be printed is "bi' or "o". Stored in image memory 2
The data in the first stage is first sent out sequentially in synchronization with the clock generated from the timing clock generator 1.

During this time, the output of the recording stage counter 6 shows "]". When the first stage data transfer is completed, a pulse is sent from the timing clock generation circuit 1 to the recording stage counter 6, and the output value of the recording stage counter 6 becomes "2".

At the same time, second stage data is sequentially sent out from the image memory. On the other hand, the output of the recording stage counter is input to the random number generator 7. The recording stage counter G is a modulo 19 counter, and the output of the random number generator 7 is selected from among the values shown in Table 1 according to the value of its output. The random number generator 7 synchronizes with the timing from the timing clock generator 1 and sends the value of 2 or 3 to the data selector 3. The data selector 3 selects the image memory 2 according to this signal.
data from buffer 4'''Q II, ''l
II, it is assigned to "21" and stored. "0", "l", and "2'" of the buffer 4 are RAMs each capable of storing recording data for one scan, and store data from the image frame 2 when selected by the data selector 3. When the data from image memory 2 is transferred to the 3rd stage, it is the n-2 scan, when it is transferred to the 10th stage, it is the n-1 scan, and when it is transferred to the 16th stage, it is the r1 scan. Recording scanning begins. Then, when the storage stage counter 6 completes one cycle and is transferred to the third stage again, the n+1th scan, etc. are sequentially recorded.

That is, when the value of the recording stage counter 6 becomes 3.10.16, the controller 1-roller 5 changes the value of the buffer 4 to L]-II.
2", "0" and outputs it to the printer. At this time, "o" of buffer 4
, the data from the 1st to 16th row is output as is, but from "]", the data from the 7th or 619th row is passed through to the 3rd row, and from "2", the data from the 14th row or 619 is output. The data from the 0th stage to the 0th stage is output as data from the 1st to the 16th stage.

Table 1 Edge ------------- Button As is clear from the above description, according to the present invention, the edge of the dot row that can be formed by one scan is the same as the edge of the dot row that can be formed by another scan. Since the edges do not coincide with each other, the joints between the recorded dots in each scan are less noticeable, and a printed image of good quality can be obtained.

[Brief explanation of drawings]

1 and 2 are diagrams for explaining the present invention in detail, respectively, and FIG. 3 is a diagram showing an example of an electric circuit used to implement the present invention. 1. Timing clock generator, 2. Image memory,
3. Data selector, 4. Buffer, 5. Controller, 6. Recording stage counter, 7.. Random number generator.

Claims (5)

[Claims] (1) While moving the recording head relative to the recording material in the main scanning direction, multiple stages of drivers 1-- are used to record in the sub-scanning direction, and the recording material is moved by the recording head in the sub-scanning direction for each main scan. In a serial printer that moves relative to
The amount of movement in the sub-scanning direction is smaller than the width of multiple rows of recording dots that can be recorded in one main scan, and the edges of the recording dot rows match the edges of the dot rows that will be recorded in the next and subsequent main scans. A method for controlling recording of a serial printer, characterized in that the amount of recording is controlled to be less than 100%. (2) A recording control method for a serial printer according to claim (1), characterized in that dots in an overlapping range in two or more main scans are distributed and recorded in each main scan. (3) The distribution is performed randomly for each multi-stage dot row in the main scanning direction.
2) Recording control method for a serial printer described in section 2). (4) Any one of claims (1) to (3), characterized in that the amount of movement in the sub-scanning direction is larger than 1/2 of the width that can be recorded in one scan. A recording control method for a serial printer described in . (5) Claims (1), (2), or (3) characterized in that the amount of movement in the sub-scanning direction is smaller than 1/2 of the width that can be recorded in one scan. Recording control method for a serial printer described in Section 1.