JPH0747332B2 - Printer print correction method - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer print correction method for expanding compressed data of a character generator of a printer that forms a character with a dot matrix of about 10 × 14 to 16 × 16. .

2. Description of the Related Art Conventionally, when a character is composed of a dot matrix, the simplest character composition is a 5 × 7 dot matrix, and character data is also composed of a 5 × 7 dot matrix in a character generator. It was

Problems to be Solved by the Invention In recent years, the resolution of devices that perform display using a dot matrix is increasing. For example, the pitch between dots was 1/3 mm, but now it is 1/6 mm. Therefore, the character structure is also 5 × 7.
The former had a 10 × 14 dot configuration because the dot density increased without changing the size of one character.

However, the character generator requires a large amount of memory to increase the resolution. 5x7 was good for a 5x7 character structure, but 10x
20 bytes are required for 14 Character generator
Of the 160 types, the memory size of 800 bytes was good, but the memory size was 3200 bytes, requiring 4 times the area.
ROM (Read Only Memory) in an inexpensive system
Although it is configured by a one-chip microcomputer without independently having the above, the memory space of 3200 bytes as described above cannot be secured because of the limited memory size. For this reason, the use of multichips is unavoidable, and the cost of the system is increasing.

The present invention intends to solve such a problem and perform high resolution printing control with a small memory.

Means for Solving the Problems In the present invention, a character generator having n × m compressed data that gives a print result of (2 × n) × (2 × m) is provided, and characters are actually printed by matrix dot printing. At the time of construction, one compressed data is made to correspond to four character data, and n
The blank data portion for individual character printing non-coloring in the xm compressed data corresponds to one blank data portion based on the individual compressed data before, after, left and right, and diagonally above and below the blank data portion. In the configuration, dot printing is performed by determining which of the four character data is to be printed.

Effect According to the present invention, when the compressed data is expanded to form the character data, the blank data portions for individual character printing non-coloring in the compressed data are individually compressed in the front, back, left, right, diagonally up and down of the blank data portion. From the data, it is determined whether any of the four character data corresponding to one blank data portion is to be character-printed.

As a result, it is not necessary to use a memory such as a flag area for storing the compressed data, high-resolution printing can be realized with a small amount of memory, and the portion forming the diagonal pattern can be smoothed. It is possible to correct the printing result without character printing on any of the four character data so that one of them can be character printed and the corner of the L-shaped pattern is sharp.

EXAMPLE An example of the specific content of the present invention will be described.

When it is attempted to obtain the printing result shown in FIG.
The data of the character generator must be organized as shown. This requires 20 bytes of memory.

In order to reduce this memory size, if 10 × 14 printing is configured with the character generator data configuration shown in FIG. 3, normally four dots are configured in one data, and the printing result as shown in FIG. 2 is obtained. Obtainable.

However, the printed result of Fig. 2 is Since the dots indicated by are missing, the print result is difficult to read.

Therefore, the white data portion for character printing and no color generation, which has no data by the power generator, is corrected as to whether or not color is generated at the time of printing. For the sake of explanation, dots corresponding to one compressed data are a, b,
Divide into c and d and 4 character data.

When the data content is "1" of the print data, the dots a, b, c,
d is printed and color is developed. "0" with blank data
, The dots a, b, c, d decide whether to print or not depending on the surrounding data contents. When the dot a is colored, it means that there is data at the same bit one address before and data at the same address one bit lower, and there is no data at one address lower one bit. A, C, J of Figure 1
The L point corresponds to the a dot, but the A point has the 1st bit data "1" at address n and the 0th bit data "1" at address n + 1 as shown in FIG. However, since the 0th bit is 1 at the address n, no color is generated. As shown in FIG. 3, the point of J is that the data of the third bit is “1” at the address n + 3, the data of the second bit is “1” at the address n + 4, and the data of the second bit is at the address n + 3. Is "0", so the color develops.

The dots of b correspond to E and G in FIG. 1, and when there is data of one address after the same bit and data of one bit lower at the same address and there is no data of one bit lower after one address. Develops color.

The dot of c corresponds to I, B, K, and D in FIG. 1, and there is 1 bit higher data at the same address as the same bit and 1 bit higher data at the same bit, and 1 bit higher data at 1 address before. Colors when not present.

The dot of d corresponds to F and H in Fig. 1, and there is data of 1 bit after the same bit and data of 1 bit higher at the same address, and there is no data of 1 bit higher after 1 address. , Develops color.

As an example, b will be described in more detail. FIG. 6 is a block diagram showing an example of a circuit for carrying out the method of the present invention. The printer has a thermal line head 1. Data is input to the data terminal 2 of the thermal line head 1 in synchronization with a signal from the clock terminal 3. Reference numeral 4 is a latch terminal. The microcomputer 5 is a one-chip microcomputer, and includes a ROM including a character generator inside, an accumulator, and registers R0 to R0.
Have 7. 6 is a data output terminal, and 7 is a multiplexer.

The contents of the character generator are as shown in Fig. 3,
Basically, as shown in FIG. 2, when one data is output twice and one line is output, the second line outputs the same contents as the first line.

As an example of the present invention, a case where print correction is performed on E in the eighth column in FIG. 1 will be described. The contents of the character generator are shown in FIG. 3, and the points of interest are addresses n + 3 and n + 4.
Processing.

First, as shown in the flowchart of FIG. 7, it is judged whether or not there is original data, and if there is data, it is output. When there is no data, the current data position is
Determine which part of a, b, c, d. Point E in FIG. 1 corresponds to part b in FIG. 5 represented by 4 dots. For the processing of part b, select the part that has the previous data and no data this time,
The data obtained by the logical product of the result of shifting to the 1-bit high order and the part where the current data exists is output. The final result of FIG. 7 is a portion where the first bit and the fourth bit are determined to be present, and correspond to E and G of FIG. 1, respectively.

As described above, according to the present invention, when the compressed data is expanded to form the character data, the blank data portion for individual character printing non-coloring in the compressed data is provided before and after the blank data portion. Based on the individual compressed data on the left, right, diagonally up and down, it is determined which of the four character data corresponding to one blank data portion is to be printed.

As a result, it is possible to realize high-resolution printing with a small amount of memory without using a memory such as a crag memory for storing compressed data, and to make the portion forming the diagonal pattern smooth, of the four character data, Characters are printed on one of the four character data so that the corners of the L-shaped pattern are sharpened, and the printing result can be corrected without character printing.

In particular, when the number of dots in character printing is small or large, a difference due to the difference in resolution is unlikely to appear, and when printing alphabets or numbers, the memory capacity can be effectively omitted. .

[Brief description of drawings]

FIG. 1 is an explanatory view showing a printing result according to an embodiment of the present invention,
FIG. 2 is an explanatory view showing a print result when the method of the present invention is not used, FIG. 3 is an explanatory view showing contents of a character generator in the method of the present invention, and FIG. 4 is a character generator in a conventional method. FIG. 5 is an explanatory diagram showing the contents, FIG. 5 is an explanatory diagram showing a dot allocation state for one data in the present invention, FIG. 6 is a block circuit diagram for executing the method of the present invention, and FIG. 3 is a flowchart of a method.

Claims (1)

[Claims] 1. A plurality of matrix-shaped dot prints,
Character data for performing character printing of (2 × n) × (2 × m) dots is expanded from a character generator having n × m compressed data obtained by compressing the character data to generate the character data. In the method for obtaining, the one compressed data is made to correspond to the four character data, and the blank data portion for individual character printing non-coloring in the n × m compressed data is arranged before, after, left and right of the blank data portion. Based on the individual compressed data in the diagonally upper and lower parts, the individual blank data part 1
One of the four character data corresponding to each character is determined to be character-printed, and the printing of the portion forming the oblique pattern and the corner portion of the L-shaped pattern in the printing result is corrected. Printer printing correction method.