JPS5825968A - Overlapping dot printer - Google Patents

Abstract

PURPOSE:To obtain characters having high quality by means of a simple head by mounting a circuit, which does not conduct overlapping to characters of which the concentration of dot density of an original pattern is remarkable, to a dot printer which uses the original pattern as an investigating point and inserts dots around the point as interpolation points. CONSTITUTION:Arithmetic operation ABCD is executed because A, B, C, D are inputted to the input of an AND gate G1, and interpolation not conducted because 1 is outputted from an OR gate G9 when the result is 1. Arithmetic operation A'B'C'D' is executed because A', B', C', D' are inputted to an AND gate G2, and the result is added to one of the input of an AND gate G8. In inhibit gates G3-G6, on the other hand, the arithmetic operation of ACD, ABD, ABC and BCD is executed to each, and the result is added to the other of the input of the AND gate G8 through an OR gate G7 when even only one among them is 1. Consequently, 1 is outputted from the AND gate G8, and outputted from the OR gate G9. Accordingly, interpolation is not conducted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an overlapping dot printing device capable of producing high-definition, low quality printing.

Conventionally, in order to improve the printing quality of dot printers, it was necessary to increase the number of wires in the print head and reduce the diameter of the wires, which caused problems in quality and service life. Therefore, an overlapping dot printing method is being considered as a means to obtain high-quality characters using a simple print head with a small number of wires.

The principle of overlapping drum F printing will be briefly explained from tS<.

In this figure, the O mark indicates the original pattern of one character.Using this original pattern as a search point, dots indicated by the 0 mark are inserted as interpolation points between the dots F that move upward, downward, left, right, and diagonally. By applying this to all dots of the original pattern, it is expected that the quality of the characters will be improved. However, in the case of characters having a large number of strokes and a complicated structure, such a method may lead to deterioration of character quality.

FIGS. 2(a) to 2(d) show a comparison between a case where there is overlap and a case where there is no overlap. If (1) does not overlap,
(b) is a case where there is overlap, and (e) and (d) are cases where there is ink bleeding due to (a) and (b) Ic, respectively. (41) As shown in &C, it can be seen that in the portion of the original pattern where the dot writing quality is high, the white portion is almost crushed.

This invention aims to solve one or more such flash points.

Characters with significant concentration of dots in 1 KAI-tone are provided with a function to prevent duplication.

The present invention will be explained in detail below.

Figures 3 to S show examples of key patterns that cause "one collapse of a character" due to concentration of dots in the original pattern of the character. Figure 3 shows an arbitrary lattice point of the complementary set of lattice point C (centered on lattice point C), and the number n of upper, lower, left and right dossi (shaded) is 4. If such a dot arrangement exists, there is a possibility that the portion C will be crushed by interpolating the dot spacing in the diagonal direction.

FIG. 4 (a) Jb) shows the case of nx3, and in (a), the number of grid points CK and adjacent grid points F is the minimum.

In (b), it is maximum (including diagonal directions).

Figures 5(a) and (b) are for n = 2, and (a
).

(b) is a state in which the number of adjacent driver F is minimum and maximum, respectively. Here, in the patterns shown in FIGS. 4(b) and 4(b), there is a possibility that the white part at the center of the parallel arrangement of dots may be covered by interpolation.

Therefore, FIGS. 3, 4(b) and 5(b)
By applying this to the single overlapping dot printing method as a key pattern that does not perform t-interpolation, deterioration in character quality can be prevented.

Next, the configuration of an interpolation selection circuit that determines a pattern in which the above-mentioned interpolation is not performed will be described.

FIG. 6 shows the coordinates of the search point. As mentioned above, the search point C' is one of the grid points C of the complementary set of the original pattern. The coordinates of the lattice points adjacent to the grid point C' are as shown in 1 to B in FIG. 6, that is, K(+1.-1).

K(0,-1), K(-1,-1), K(-1゜0)
, K(-1,+I L K(0,+1), K(+1.
+1)e and K(+1.O).

Note that the point coordinates of s raw point d are K(0,0).

At this time, the state signal Kc for determining one of the key patterns shown in FIG. 3, FIG. 4(b), and FIG. 5(b) is expressed by the following logic.

Kc:I:MncD+Addinco+ANcp+MuBCD+ABCD+ABCD +ABCD+ABCD+ABCD) =ABCD+A'B'σD'(SCD+A]TD+AB
C+BCD) ・・・・・・・・・・・・・・・
...(1) Here, A=cK(0,-1), B=K(
-1,O)C=aK(0,+1),D=K(+1.0
)A'=K(+1.-1), B'=K(-1,-
1) C'=K(-1,+1), D'=K(+1.-1
) If Kc is @1', no interpolation is performed, and the search point d is moved by scanning in the grid coordinate axes I and J directions. FIG. 7 shows an example of the configuration of a circuit that processes the logical expression of equation (1). The processing circuit is 'r! It can be seen that it can be easily configured by using TL game.

In FIG. 7, % 01 e J e G@ is AND gate s G, # 04 e G@ t and G, inhibit sQq and G, and OAG F.

Next, the operation will be briefly explained.

Since A, B, C, and D are input to the AND gate G, the operation of the first term of equation (1), that is, (AB
CD) is depthed, and if the result is 11″, then the ORGATE G
, since @l 1 # is output.

No interpolation is performed, and andgoo)G, ic is p:
, B', c', r;, so the (12th
The second term of the equation (i B'C'D') is calculated, and the result is added to one of the inputs of ANDG. Also, for Inhibit F Game) G1-G, (XCD), [Amo], (ABC).

and (ncfj) are performed, and if even one of them is @1", it passes through the or gate G and is added to the other input of the AND gate G. As a result, l11' is input from the AND gate G. This is the output from OAG)G.Therefore, no interpolation is performed.

FIG. 8 is a pull diagram showing the configuration of an embodiment of the present invention. In this figure, 11 is a 7-ont memory in which the original pattern is stored. Reference numeral 12 denotes an interpolation circuit, which creates 7-on-F for duplication based on the information in the 7-on-F memory 11. 13 is a selector for selecting whether or not to perform interpolation. 14 is a line buffer that stores one line. 1S is a non-i control system, and the row buffer 14&c is therefore -・mma(
16 is an interpolation selection circuit which is the main part of this invention, and has the function explained in FIG. Decide whether to interpolate or not for one character, drive the selector 1st, activate or deactivate the interpolation circuit 12, and interpolate or stop interpolation to obtain a single character with good quality. Allow printing to occur.

Note that the determination of whether to interpolate or not is not limited to the above embodiment.

As explained in detail above, the present invention has the advantage of being able to determine whether or not complex character patterns overlap using a simple interpolation selection circuit, and preventing deterioration of character quality due to printing of duplicates. has.

[Brief explanation of drawings]

Figure 1 is a diagram of the principle of the double-drill F printing method, Figure 2 (a),
(b), (e), and (d) are duplicates) Diagrams showing changes in character quality due to printing, Figures 3 and 4 (a), (b)
, No. ! Figure 1 (a) @ (b) G! A diagram showing a key pattern for determining whether or not interpolation is possible, No. 61EI is an explanatory diagram of search points, FIG. FIG. In the figure, C is a grid point, C' is a search point, and 1 to 8 are search points C'
, 11 is an interpolation circuit, IS is a selector, 14 is a row buffer, 1s is a hammer control system, and 16 is an interpolation selection circuit. Figure 3 Figure 4 (a) (b) Figure 5 (a) (b) Figure 6 111→-'' Figure 7

Claims (1)

[Claims] In an overlapping dot printing device that forms characters by a collection of dots at matrix lattice points, and interpolates adjacent tod intervals with large lattice intervals among the character patterns using a plurality of dots, regarding the lattice points to be interpolated,
V4? What is provided is an interpolation selection circuit that selects interpolation execution based on the presence of dots at adjacent grid points in the vertical, horizontal, and diagonal directions. Duplicate dot printing device that produces mold.