JPH01218849A - Printer of data processing apparatus - Google Patents

Abstract

PURPOSE:To make the character density of a document uniformly visible as a whole by a reader, by mounting a density data memory means for storing density data at every character pattern and correcting a pulse width corresponding to the black dot arrangement state of a character pattern at every character along with the correction of the pulse width due to a head current supply history. CONSTITUTION:Density correction data is a character font data memory 6 and, in addition to the correction of a dot (pulse width) due to the current supply history stored in a dot correction table 14, the density correction corresponding to each character pattern is further performed. That is, at the time of the printing of the n-th figure, the current supply pulse width from the first dot to the 24-th dot stored in the dot correction table 14 is corrected on the basis of the flag data (density correction data) of the n-th figure of a printing buffer 12. A pulse width correction table 15 is used in the correction of this current supply pulse width and a current is supplied to each of pins of 24 dots by the pulse width converted according to the table 15.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in printing devices for personal computers, word processors, office computers, measuring instruments, and other various data processing devices, and particularly relates to printing devices having a serial thermal head. When printing a character pattern such as a single letter or symbol, the black dot energization pulse width is corrected to control the amount of heat generated to obtain the optimum density for each character. The present invention relates to a printing device for a data processing device that improves print quality by making density unevenness caused by character-by-character density differences, that is, density unevenness caused by differences in the number of black dots in a character pattern less noticeable.

Specifically, when printing character patterns,
In addition to the conventional control of the calorific value of black dots, which corrects the calorific value of each dot by controlling the pulse width based on the so-called head energization history, and controls the density of each dot to be uniform, each character pattern By performing density correction corresponding to Related to printing devices.

For serial thermal printers used in personal computers, word processors, etc., such as thermal transfer printers and thermal printers, one character can be printed on a 24x24
When printing a character pattern of (dots), a print head having 24 printing pins arranged in a vertical row is used as a heating element corresponding to each dot.

FIG. 1O is a diagram showing an example of the pin arrangement of a print head of a serial type thermal printer.

Since each pin of the print head shown in FIG. 10 is composed of a resistor, each pin can be made to generate heat by energizing each pin.

With heat transfer printers, the heat generated by each pin transfers the carbon on the printing ribbon onto the paper, and with thermal printers, the corresponding position on the printing paper changes color, creating a character expressed in a black dot pattern. is printed.

The print head shown in Fig. 10 has 24 pins arranged in one vertical column, and the 1st to 24th pins can be selected for each column according to the character pattern of the characters to be printed. When electricity is applied, the heat generated prints a dot pattern.

In this way, a serial thermal printer prints a character pattern made up of a collection of dots by moving the head while sequentially selecting which of the pins arranged in a row will generate heat for each row. There is.

By the way, since thermal printers utilize heat generated by each pin made up of a resistor, print quality is greatly affected by the heat generation state of each pin.

For example, if the print head generates more heat than necessary, the dots on the paper may smudge, causing letters to become blurred, resulting in a deterioration in print quality.

Therefore, conventional methods have been used to improve printing quality by controlling the amount of heat generated by each pin to be uniform when printing black dots.

Conventional heat generation control methods can be broadly classified into the following two types.

The first method is to adjust the voltage applied to each pin.

This voltage adjustment is performed by fine adjustment of a variable resistor, but is mainly performed by the user, and although the configuration of the printing device is relatively simple, the print quality is not very good.

The second method is to control the width of the energizing pulse to each pin. This pulse width adjustment is performed by the printer firmware.

This pulse width control, so-called pulse width correction control based on the head energization history, is performed every time each pin is energized.

Next, we will use this "second correction method," which is a method of controlling correction so that the density of each dot is uniform by controlling the width of the energizing pulse to each pin when printing black dots. will be explained in detail.

In this pulse width correction control based on the head energization history, when printing each dot expressed in black, the current print data, the two or three previous data, and the surrounding data are referred to. The amount of heat generated is controlled by determining the energization pulse width of the data.

FIG. 11 is a diagram showing an example of correction control of the pulse width for each dot based on the head energization history.

FIG. 11 shows a case where the current data is black, that is, when printing a black dot, the time width A-D for the head energization period H is determined by referring to the data for the previous three dots. ing.

For example, history correction A on the second line is performed when all three dots of data before that are white and this pin is not energized during that time. In this case, regardless of the upper and lower data of the previous one dot, compared to the spatula energization cycle H,
Electricity is applied only for a time width A with little difference (time width A is shown on the right side of the second line, and is shorter than the head energization cycle H on the first line)
.

In the history correction B on the third line, the data for the previous three dots are black, white, and white, and the three dots before are energized once and the two dots after are not energized. In this case, regardless of the data above and below the previous one dot,
(The time width B is shown on the right side of the third line, and is shorter than the time width of the history correction A on the second line).

The history correction C on the fourth line is a time width set in three cases.

First, the data for the previous three dots are irrelevant (black or white), white, black, the two dots before are energized once, and the data below the one dot immediately before that is white. When power is not applied, regardless of the data above the previous one dot,
Power is applied for a time width C that is even shorter than B (time 41I)
C is shown on the right side of the fourth line, and is shorter than the time width of history correction B on the third line).

Second, the data of the previous 3rd dot and 2nd dot are
Similar to the case of , if the previous one dot is upside down and the data above the previous one dot is white and is not energized, the time width C is applied regardless of the data below the previous one dot.
energize.

The third case is when the data for the previous three dots are all black, and the data above and below the immediately previous one dot are white and are not energized; in this case as well, time MC is energized.

The history correction on the fifth line is a case that does not correspond to the above history corrections A to C.

First, the previous 3 dots of data are unrelated (black or white), white, black, and the previous 2 dots are once, like the first and second history correction C in the fourth line. When energized,
And the data above and below the one dot just before that are both black,
This is when they are energized at the same time. In this case, the current is applied for a time width that is even shorter than C (the time width is shown on the right side of the 5th line, and is shorter than the time width of history correction C on the 4th line).
.

In addition, in all cases that do not correspond to any of the above, history correction is performed.

By performing such history corrections A to D, printing quality can be improved.

Note that this second method, that is, pulse width correction control based on head energization history, is based on how long the corresponding dot (pin) was energized within a certain past time when printing one dot. A method is also used in which the current dot energization time is determined based on the total energization time.

Since a normal printing device has a fast printing speed, even if the pulse width is determined based on the total energization time within a certain period of time in the past, it is possible to print with sufficiently high print quality.

In this way, in the second correction method, that is, the method of correcting the pulse width of the current printed dot based on information on the head energization history, the corresponding dot (pin).

For example, for the first pin, to correct the density of the first bin, the energization times of several past data relative to the current data are used as correction data.

Therefore, when printing black dots, each pin is energized so that it always has a constant heat generation temperature, and each black dot is printed with uniform density.

However, the entire character that is actually being printed,
In this explanation, each character formed as a collection of 24x24 (dots) has its own unique pattern, and the number of black dots differs depending on the size of the character and the number of strokes, so each character has its own unique pattern. The concentration of appears to be different.

FIG. 12 is a diagram showing an example of a character pattern printed by a conventional printing device, in which (1) shows a case of normal density and (2) shows a case of high density.

As shown in FIG. 12(1), the half-width English character rmJ with a narrow line width is generally printed with a light density under pulse width correction control based on the head energization history.

Therefore, in order to increase the density of the entire character, increase the number of black dots and make the entire pattern thicker.
As shown in Figure (2), the entire character is crushed.

Therefore, in order to maintain the overall printing quality, the only countermeasure for half-width characters rmJ with narrow line widths is to print them thinly, and only the characters with the density shown in Figure 12 (1) can be obtained. Ta.

The same is true for kanji; complex characters with many strokes and thin lines are printed thinly to prevent the entire character from being blurred, so they are expressed with relatively few strokes and thick lines. Compared to patterns such as kanji, numbers, and symbols, the overall density of the characters appears lighter, and the print quality of the entire document deteriorates.

In other words, in order to control the print density of the entire document to be constant, it is necessary to , it is necessary to reduce the overall printing density (shorten the pulse width), and conversely, for characters with a simple structure or thin lines, in other words, for characters with few black dots, It is necessary to increase the print density (lengthen the pulse width).

However, in the conventional pulse width correction control based on the head energization history, when printing each dot, density correction is performed using the data up to several dots before it and the data of the previous upper and lower surrounding dots. Although the dot pattern is printed with uniform density, the correction is independent of the number of black dots for each character.

In this way, in the conventional density correction method, the pulse width is controlled without considering the total number of black dots forming one character.

However, depending on the number of strokes of the characters, the line width, etc.
Since the apparent density level of the entire character fluctuates, the conventional density correction method based on the energization history has the disadvantage that the print quality inevitably deteriorates when looking at the entire document.

Therefore, in the printing device of the data processing device of the present invention, such inconveniences in conventional printing devices are solved, and the pulse width is corrected based on the head energization history, and the arrangement of black dots in the character pattern for each character is corrected. By correcting the pulse width according to the situation, the purpose is to ensure that the character density of the entire document appears uniform to the reader's eyes, resulting in visually beautiful, high-quality print. Do/Eye-
For this purpose, the present invention includes an input device, a display device,
A character data storage memory that stores character data from an input device, a character font data storage memory that stores character pattern data for each character, a printing device that has a serial thermal head, and a central processing that controls each of these parts. In a conventional data processing device, the conventional data processing device has a function of converting character data from the character data storage memory into a character pattern and printing it, and a function of correcting the pulse width for each dot based on the head energization history.
Density information storage means stores density information for each character pattern, and when character data from the character data storage memory is developed into a corresponding character pattern and printed, the density information for each character is used to control the temperature of the thermal head. It controls the amount of heat generated by the black dot.

Next, regarding the printing device of the data processing device of this invention,
Examples thereof will be described in detail with reference to the drawings.

To facilitate understanding, an example of character font data used in a conventional data processing device will first be described.

FIG. 2 is a diagram showing an example of character font data used in the data processing device, and is a diagram showing an example of a character pattern for one character "Kan".

If one character is a 24x24 (dot) character pattern, the character font data is.

It is given as shown in FIG.

In other words, the character font data for the kanji "kan" is.

In memory, the 1st byte of the 1st row, the 2nd byte of the 1st row, the 3rd byte of the 1st row, the 1st byte of the 2nd row, etc.
..., 1st byte of line 24, 2nd byte of line 24,
A total of 72 bytes of data are stored in the order of the 3rd byte of the 24th line.

In addition to such conventional character font data, the printing device of the data processing apparatus of the present invention adds 1 byte of density information to correct the density of each character, and prints one character with a total of 73 bytes. This is character font data for minutes.

For example, if we add 1 byte of density information to the beginning of the character font data, the character font data for the kanji "kan" in Figure 2 will have 1 byte of density information and 1 byte of density information in the first line.
Byte 1, 2nd byte of 1st line, ..., 2nd byte of 24th line, 3rd byte of 24th line, totaling 73 bytes of data, stored in memory in this order. Stored. In addition.

It goes without saying that this 1-byte density information can also be stored in another memory.

FIG. 1 is a functional block diagram showing an embodiment of the main configuration of a printing device of a data processing apparatus according to the present invention. In FIG. 1, 1 is an input device, 2 is an input control section, and 3
is a character editing processing unit, 4 is a text data storage memory, and 5 is a text data storage memory.
is the display data control section.

6 is a character font data storage memory, 7 is a display data buffer, 8 is a display control unit, 9 is a display device, 10 is a print data control unit, 11 is a print text expansion buffer, 12
13 is a print buffer, 13 is a dot correction expansion buffer, 14 is a dot correction table, 15 is a pulse width correction table, 16 is a print control unit, and 17 is a printing device.

In the printing device of the data processing apparatus of the present invention shown in FIG. 1, firstly, density correction information is added to each character in the single-character font data storage memory 6, and secondly, this 3. The print buffer 12 is provided with a density correction information area in order to control the energizing pulse width for each dot based on the density correction information, and thirdly, a pulse width correction table 15 is provided. Except for this point, the basic configuration is similar to a conventional data processing device.

To facilitate understanding, parts common to conventional data processing devices will be explained first.

If the system is running with word processing functionality,
The character data input from the input device 1 is sent to the input control unit 2.
One character is inputted to the editing processing section 38 via.

Then, the text is edited by the character editing processing section 3 and stored in the text data storage memory 4.

At the same time, the display data control unit 5 reads the character code in the text data storage memory 4 and converts it into the corresponding pattern data in the character font data storage memory 6.

The display data control unit 5 sequentially arranges the converted pattern data in the display data buffer 7, and also displays the converted pattern data in the display data buffer 7.
A display command is given to the display device 9.

Furthermore, when a print command is input from the input device 1, the print data control section 10 is activated via the input control section 2.

The print data control unit 10 includes a text data storage memory 4
One line of text data to be printed is extracted from and transferred to the printing text expansion buffer 11.

Next, the text data (character data) developed on the print text development buffer 11 is read character by character from the font data storage memory 6, converted into a character pattern, and stored on the print buffer 12.

Next, the print control section 16 is activated and prints in units of digits according to the character pattern stored on the print buffer 12.

In this case, when printing black dots, character pattern data is transferred to the dot correction development buffer 13 in order to correct the pulse width based on the energization history.

For example, the dot correction development buffer 13
As shown in the figure, when referring to the previous three dots of data, it has the capacity to store the character pattern data of the previous three digits.

The previous 3 images stored in this dot correction development buffer 13
The dot data determines the energizing pulse width A-D for each dot corresponding to black.

Information on the determined energizing pulse width A-D for each dot is held in the dot correction table 14, and is output to the printing device 17 for printing.

Through such an operation, the energizing pulse width is controlled according to the second correction method described above, and black dots are printed with uniform density.

As already mentioned, the printing device of the present invention simply
In addition to the correction that prints black dots with uniform density, it also performs density correction that makes the density of all characters appear uniform, corresponding to the character pattern such as the number of strokes and size of each character. I have to.

To this end, in the block diagram of FIG. 1, density correction information for controlling the density of each character is added to the character font data storage memory 6.

As a specific example, as mentioned in relation to Figure 2 above,
One byte of character correction information is stored at the beginning of the character pattern of the character "Kan" in the character font data storage memory 6.

FIG. 3 is a diagram showing an example of the storage state of 1-byte information for character correction used in the printing device of the data processing apparatus of the present invention, in which (1) is the storage area for density correction information, (2) shows an example of density correction information.

This character correction information, that is, the density correction information, corresponds to the type of one character, and when controlling the density in four stages, as shown in FIG. 3 (1), one byte (8
The Do bit and the D1 bit of the data D and -D7 of the bit) are used.

Then, as shown in FIG. 3 (2), for example, "A" to "
Set the information for 4 stages of "Engineering".

This density information for character correction is information for further finely correcting the pulse width (A to D) based on the head energization history shown in FIG. 11 in accordance with each character. Energizing pulse A-D for each dot
(the pulse width shown in the oldest column of FIG. 11).

In other words, even if the energization time of the corresponding one dot is determined to be energization pulse A according to the head energization history, the character may be expressed with a thin line like a kanji or a relatively simple line like a number. It is controlled so that the time width is different depending on when it is expressed as .

For example, for characters with a standard number of strokes, the density correction information is
When the character ``Kan'' in Figure 2 has a relatively large number of strokes, the density correction information for the character with a relatively large number of strokes is set to ``technique'' to reduce the overall density (however, the density of black dots is uniform). ).

In addition, the density correction information for the half-width English character rmJ in Figure 12 is set as "A", and the density correction information for characters with a relatively small number of strokes, such as the Chinese numerals "-", "r2", etc., is set as "A". , increases the overall density (however, the density of black dots is uniform).

In this way, if you increase the density of characters with a small number of strokes or small characters, and reduce the density of characters with a relatively large number of strokes,
It is possible to make the density of characters throughout the document appear uniform.

FIG. 4 is a diagram showing the relationship between the character correction information stored in the pulse width correction table 15 of FIG. 1 and the corresponding pulse width.

As shown in Fig. 4, the energization time (pulse width) of the corresponding black dot varies from "A" to rDJ depending on the energization history.
When any one of the four levels is selected, four different energization times are selected, that is, energization times corresponding to the density correction information “A” to “D” given to each character in advance. controlled.

Here, the extraction of one printed line of text data and the development of a character pattern will be described.

FIG. 5 is a diagram showing the relationship between text data and print buffer data in the printing device of the data processing apparatus of the present invention, in which (1) is text data, (2) is text expanded data, and (3) is This is print buffer data.

When printing is commanded, data as shown in FIG. 5 (2) is transferred from the text data storage memory 4 in FIG. 1 to the printing text expansion buffer 11 as text data for one line of printing. , text expansion data is created. In this state, the printing text expansion buffer 11
The text data expanded into is character code data.

The text data for one printing line on this printing text expansion buffer 11 has contents as shown in FIG. 5(1).

That is, a pointer to a text address (character font data storage memory 6) is stored for the half-width character shown in FIG.
The pointer to the text address is in the digit position, and the full-width frac key is in the second digit position.

each stored.

In short, the text development data includes this figure 5 (2)
As shown in the figure, pointers to text addresses are stored in half-width units for one line of text to be printed.

After creating text development data for one line of printing as shown in FIG. 0 Loads the font data and stores it in the print buffer 12 in Figure 1.
The above processing is similar to the processing performed by conventional printing apparatuses.

In the printing device of the data processing apparatus of the present invention, the print buffer 12 has a dot area for storing dot pattern data and a flag area for storing density correction information, as shown in FIG. 5(3). There is.

First, the dot area is 1. For example, the composition of one character is 24X.
24 (dot), the length of one digit is 24 dots (3 bytes), and the total number of digits has a capacity of (24 x number of characters) corresponding to the characters of one print line. ing.

Further, for each digit of this dot area, a flag area is provided for storing, for example, 2-bit density correction information as shown in FIG. 3(2).

Then, as shown in FIG. 5 (3), the character correction information extracted together with the character font data is stored in the flag area of each digit of the print buffer 12, as shown in FIG. 3 (2). The density correction information shown in “A” to “
Stores "Engineer".

By repeating such character processing, when the character font for one printing line has been developed, the printing process for one line is performed. The pulse width (current application time) is also corrected based on the history.

Next, regarding the printing device of the data processing device of this invention,
The density correction process during printing will be explained in detail.

FIG. 6 is a flowchart showing the main processing flow during printing in the printing device of the data processing apparatus of the present invention. In the drawing, #1 to #8 indicate steps.

In step #1, the print buffer 12 is cleared.

In step #2, one line of text in the print line is developed.

In step #3, text expansion data for one character is imported.

In step #4, the font data of the corresponding character is extracted and stored in the print buffer 12.

In step #5, the four levels of density correction information ("A" to "D") shown in FIG. 3(2) are stored in the flag area of the print buffer 12.

In step #6, it is determined whether or not one line of character font data and density correction information has been stored. If it has not been stored yet, the process returns to step #3, and steps #3 to #5
Repeat the process.

If it is determined in step #6 that one line of character font and density correction information has been stored, the process proceeds to step #7, where printing processing for one line is performed by controlling the energization time based on the density correction information. conduct.

In step #8, it is determined whether all text has been printed, and if it has not been printed, the process returns to step #l.

Thereafter, steps #1 to #7 are repeated, and when it is determined in step #8 that all text for one line has been printed, the flow shown in FIG. 6 is ended.

Next, in the flowchart of FIG. 6, the correction control of the amount of heat generated during the printing process for one line performed in step #7 will be described in detail.

The following Fig. 7 is a flowchart showing the flow of the correction control process for the heat generation amount of each dot during printing in the printing device of the data processing apparatus of the present invention. Indicates the

In step #11, the dot correction development buffer 13 is cleared.

FIG. 8 is a diagram showing an example of the dot correction expansion buffer 13.

The dot correction expansion buffer 13 is similar to the dot correction expansion buffer used in conventional printing apparatuses.

That is, as shown in Fig. 8, each horizontal row has 24 dots (3 bytes), and the previous three data (3 bytes)
It has a capacity of 4 dots in the vertical direction so that it can store up to the previous dot data.

Then, from the bottom, the nth digit, (n-1)th digit, (n-
2) Data of 24 dots each for the digit and (n-3) digit are stored.

In step #12, the n-th 24 dots from the print buffer 12 are taken into the lowest position of the dot correction expansion buffer 13.

In step #13, one dot's worth of history correction data (A to D in FIG. 11) is determined based on the previous three data in the dot correction development buffer 13.

FIG. 9 is a diagram showing an example of the dot correction table 14.

This dot correction table 14 is also similar to the dot correction table used in conventional printing apparatuses. That is, as shown in FIG. 9, from the bottom, memory of 1 byte (8 bits) each is lined up from the 1st dot to the 24th dot, for a total of 24 bytes.

In step #14, correction data for the first dot is stored in the first byte of the dot correction table 14.

In step #15, it is determined whether or not the correction data for 24 dots has been stored. If it has not been stored yet, the process returns to step #13 and the processes of steps #13 to #15 are repeated.

When it is detected in step #15 that all the correction data for 24 dots has been stored in the dot correction table 14 shown in FIG. 9, the process proceeds to the next step #16. Processing up to 15 is the conventional second
This is similar to the processing performed in the correction method.

In addition to the dot correction (pulse width A-D) based on the energization history stored in the dot correction table 14, the printing apparatus of the present invention further performs density correction corresponding to each character pattern.

That is, in step #16, when printing the nth digit, the dot correction table 14 is
The energization pulse widths from the 1st dot to the 24th dot stored in are corrected.

The pulse width correction table 15 shown in FIG. 4 is used to correct the energization pulse width.

In step #17, each bin of 24 dots is energized according to the pulse width converted according to the pulse width correction table 15.

In step #18, it is determined whether the processing for one printing line (all columns) has been completed, and if it has not been completed,
Proceed to step #19, where the dot correction expansion buffer 13
Shift the contents of ``upward'' one step at a time.

In other words, the current n-th dot data goes to the (n-1)th digit, the (n-1)th dot data goes to the (n-2)th digit, and the (n-2)th dot data goes to the (n-2)th digit. By shifting the data to the (n-3)th digit, the lowest area of the dot correction development buffer 13 where the n-th digit data had been stored is cleared, and the next (n+1)th digit is shifted. Prepare for inputting dot data for printing.

Next, return to step #12, and step #12 to #17
Repeat the process.

By repeating steps #12 to #17,
A printing operation is performed for each digit for one line of printing.

When it is detected in step #18 that all processing for one line of printing has been completed, the flow shown in FIG. 7 is ended.

As described above, in the printing device of the data processing device of the present invention, in addition to the conventional correction of the pulse width for each dot based on the energization history (correction according to A-D in FIG. 11), For characters, pulse width correction corresponding to the character pattern for each character (density correction information "A" in Figure 3)
~ ``Work'').

Therefore, the density of the printed dots is uniform for each character, and the apparent density of the characters is also uniform throughout the document, so that beautiful, high-quality printing can be obtained.

In recent years, the pattern composition of one character has changed from the conventional 24x24
(dot) to 32X32 (dot), etc.
The number of dots that make up one character tends to increase as the number of dots becomes smaller, such as 48x48 (dots).

In this way, as the number of dots constituting one character increases, the density difference becomes more noticeable between a character with a complex pattern and a character with a simple pattern. Density correction corresponding to a character pattern by a printing device of an apparatus is extremely effective in improving the level of print quality.

In one or more embodiments, a case has been described in which the character correction information shown in FIG. 3(2), that is, the density correction information "A" to "E" is stored in the character font data storage memory 6. However, this density correction information does not necessarily have to be stored in the character font data storage memory 6, but can also be stored in another memory, and is not limited to the embodiment.

Further, if the density correction information "a" to "technique" is 1, for example, 24 digits during printing of one character, it is always a constant value during the 24 printings. Therefore, if the value is held in another memory while printing one character, 24 digits can be stored without having to provide a flag area for each digit, as described in Figure 5 (3). Correction can be performed using the same density correction information during printing.

As described above in detail, the present invention includes an input device, a display device, a character data storage memory that stores character data from the input device, and a character font data storage memory that stores character pattern data for each character. and,
It is equipped with a printing device having a serial type thermal head and a central processing unit that controls each of these parts. A data processing device having a pulse width correction function for each dot, comprising density information storage means for storing density information for each character pattern, and developing character data from the character data storage memory into a corresponding character pattern. When printing, the amount of heat generated by the black dot of the thermal head is controlled based on the density information for each character.

Effects Therefore, according to the printing device of the data processing device of the present invention, the density of black dots can be controlled for each character according to the number of black dots, which varies depending on the number of strokes, etc. , it is possible to make the density of characters uniform throughout the document.

As a result, it is also possible to create character font data that provides an optimal pattern without having to worry about smudging or blurring during printing.

Furthermore, serial thermal printers that print characters and symbols in a dot pattern are widely used not only in Japanese word processors and personal computers, but also as output devices for measuring instruments, etc. Since this method can be implemented, it is possible to improve the printing quality of various printed materials, and many excellent effects can be obtained, such as the first, which has an extremely wide range of applications.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram showing one embodiment of the main configuration of a printing device of a data processing device according to the present invention. FIG. 2 is a diagram showing an example of character font data used in the data processing device. FIG. 3 is a diagram showing an example of the storage state of 1-byte information for character correction used in the printing device of the data processing device of the present invention. , (1) is the density correction information storage area, (2) is a knee example of the density correction information, and FIG. 4 is the character correction information stored in the pulse width correction table 15 of FIG. 1 and its corresponding character correction information. FIG. 5 is a diagram showing the relationship between text data and data in the print buffer in the printing device of the data processing device of the present invention, where (L) is the text data, (2) is text expansion data, (3) is print buffer data, FIG. 6 is a flowchart showing the flow of main processing at the time of printing in the printing device of the data processing device of the present invention, and FIG. 7 is the data of the present invention. FIG. 8 is a flowchart showing the flow of processing for correcting the amount of heat generated by each dot during printing in the printing device of the data processing device. FIG. 8 is a diagram showing an example of the dot correction expansion buffer 13. FIG. 9 is a diagram showing an example of the dot correction table 14, FIG. 10 is a diagram showing an example of the pin arrangement of the print head of a serial type thermal printer, and FIG.
FIG. 12 is a diagram showing an example of the correction control of the pulse width for each dot based on the head energization history, and FIG. 12 is a diagram showing an example of a character pattern printed by a conventional printing device. ) shows the case of high concentration. In the drawings, 1 is an input device, 2 is an input control section, 3 is a character editing processing section, 4 is a text data storage memory, 5 is a display data control section, 6 is a character font data storage memory,
7 is a display data buffer, 8 is a display control unit, 9 is a display device, 10 is a print data control unit, 11 is a printing text development buffer, 12 is a print buffer, 13 is a dot correction development buffer, and 14 is a dot correction table. , 15 is a pulse width correction table, 16 is a print control unit, and 17 is a printing device.稗 2 mouth (2) Kano 3 figure 4 figure God 5 figure 24 To...tsuke (3 bytes) body 9 seagull-3!1o illustration 12 Leap procedure correction band (method) 1. Indication of the case 1986 Patent Application No. 45547 2, Name of the invention Data processing device printing device 3, Person making the amendment Relationship to the case Patent applicant 1-3-6 Nakamagome, Ota-ku, Tokyo (674) Rico Co., Ltd. - 4. No agent (voluntary amendment) 6. Subject of amendment Figure 7 of the drawings 7. Contents of amendment

Claims (1)

[Claims] an input device, a display device, a character data storage memory that stores character data from the input device, a character font data storage memory that stores character pattern data for each character, and a printing device that has a serial thermal head; It is equipped with a central processing unit that controls each of these parts, and has a function of converting the character data from the character data storage memory into a character pattern and printing it, and a function of correcting the pulse width of each dot based on the head energization history. The data processing apparatus includes a density information storage means for storing density information for each character pattern, and when character data from the character data storage memory is developed into a corresponding character pattern and printed, the density information for each character is A printing apparatus characterized in that the amount of heat generated by the black dots of the thermal head is controlled based on information.