JP4682281B2 - Image forming body having line drawing in which moire is prevented - Google Patents

Description

The present invention relates to an image forming body having banknotes, stock certificates, securities, pass tickets, passports, gift certificates, cards and other line drawings.

Conventionally, image forming bodies that require prevention of counterfeiting or copying, for example, precious printed matter, use line drawing rather than halftone dots that are often used for general printed matter as a means of expressing the design. It has been. Examples of line drawings include a line-shaped copy-forgery-inhibited pattern pattern, a chromatic pattern, and an intaglio line drawing found in copperplate prints. The reason why line drawings are often used for precious printed matter is that printed matter expressed by line drawing is more difficult to counterfeit than printed matter expressed by halftone dots, and when the genuine printed matter and counterfeit printed matter are compared. Authenticity is easy to distinguish.

More specifically, first, in the case of a printed matter expressed by halftone dots, a duplicated printed matter that is mistakenly recognized as a genuine product is produced by copying it with a popular high-precision copying machine. In addition, after taking a close-up shot with a professional plate-making camera or a high-resolution scanner that has become popular in recent years, a halftone dot is regenerated by a general plate-making facility based on this, and a printing plate is obtained. By performing printing, a counterfeit printed matter that is very similar to the genuine product is produced. In addition, since authenticity determination of such counterfeit printed matter is performed by the shape and arrangement of fine halftone dots that exist in large numbers in the printed matter, authenticity determination is difficult even for those in the printing field, It is even more difficult for ordinary people.

On the other hand, in the case of a printed matter expressed by a high-definition line drawing, in order to obtain a counterfeit printed matter that does not feel uncomfortable with an authentic printed matter, the quality of the drawing line must be faithfully reproduced, which can be obtained by the method described above. In a copy printed matter or a counterfeit printed matter, an image line is expressed by a scanning line or a halftone dot, and it is extremely difficult to reproduce a high quality image line. In addition, authenticity discrimination between genuine prints and counterfeit prints is performed by confirming the quality of the image line. However, as described above, it is difficult to reproduce the true image line of the true print product. Even a general person as well as a person can confirm at first glance the uncomfortable feeling of an image line of a counterfeit printed matter. The above is the reason why line drawings are used for precious printed matter, and various line drawing printed materials have been proposed (Patent Document 1, Patent Document 2, Patent Document 3).
JP-A-9-58112 JP-A-9-58113 JP-A-9-76622

Furthermore, as a method for making it more difficult to forge or copy a printed matter expressed by a line drawing and to enhance the effect of preventing forgery, some or all of a plurality of line drawings are superposed on each other. For example, the line drawing obtained by offset printing and the part or all of the line drawing obtained by intaglio printing have been conventionally overlapped.

By the way, a method of superimposing a plurality of colors is currently used in process printing with halftone dots of four colors of cyan (C), magenta (M), yellow (Y) and black (K), which are the mainstream of general printed materials. Is also being done. In this printing, the halftone angle of each color is designed to be different in order to prevent the occurrence of moire due to the interference of halftone dots of each color. For example, the halftone angles of C, M, Y, and K are designed as 15 degrees, 45 degrees, 0 degrees, and 75 degrees, respectively, to prevent the occurrence of moire due to the interference of halftone dots of each color.
“Printing guidebook 5 for creators”, published by Genkosha Co., Ltd., August 1, 1994, page 92

For image forming bodies that require prevention of forgery or copying, for example, valuable prints, line drawings are often used, and in order to enhance the effect of preventing forgery, some or all of line drawings are superposed on each other. This is as described above. However, when part or all of a plurality of line drawings are overlapped with each other, there is a problem that moire occurs due to interference between the line drawings in the overlapping portions. In particular, when each line drawing has regularity, for example, a line drawing having a line shape, there is a problem that moiré is more noticeably generated.

As a method of avoiding the moire problem, a method of making one of a plurality of line drawings printed with a dark color such as black or brown and the other printed with a light color such as yellow or yellow-green to make the moire less noticeable. There is. However, this method has another problem in that there are restrictions on the selection of colors that can represent line drawings.

As another method for avoiding the moire problem, as in the case where the halftone angle is designed in the process printing using the above-described four-color halftone dots, the angle of the line of one of the line drawings is changed to the other. There is also a method of designing so that the angle of the line drawing is less likely to cause moire, for example, 45 degrees. However, this method has another problem that the line drawing angle of the line drawing is restricted.

If the line drawing is not a simple tint block pattern but a pattern with a specific theme such as an intaglio print, for example, a landscape, a building, or a human figure, the line that represents the background to make the pattern stand out. Must be placed at the desired angle to represent the design and background. In this case, priority is given to avoiding the moire problem, or sacrifice of the arrangement of the strokes at a desired angle to express the pattern and the background, or priority is given to the arrangement of the strokes at the desired angle. Thus, there is a problem that the moiré problem must be avoided or one of them must be sacrificed.

An object of the present invention is to solve the above-mentioned problems. Specifically, the present invention makes it possible to make moiré inconspicuous even when a plurality of line drawings are overlaid, and without being restricted by the color and angle of the line drawings, images such as precious printed matter having a high anti-counterfeit effect It is an object to provide a formed body.

A first invention of the present invention is an image forming body in which a part or all of a plurality of line drawings overlap each other, and a line constituting at least one line drawing of the plurality of line drawings overlaps with another line drawing. The image forming body is a broken line.

A second aspect of the present invention is an image forming body in which a part or all of a plurality of line drawings overlap each other, and a line constituting at least one line drawing of the plurality of line drawings overlaps with another line drawing. The image forming body is a curved line.

According to a third aspect of the present invention, there is provided an image forming body in which a part or all of a plurality of line drawings overlap each other, and an image line constituting at least one line drawing of the plurality of line drawings overlaps with another line drawing. The image forming body is a broken line and a curved line.

According to a fourth aspect of the present invention, in the image forming body according to any one of the first to third aspects, the at least one line drawing is constituted by a line-like drawing line in a portion overlapping with another line drawing. It is.

According to a fifth aspect of the present invention, in the image according to the first, third and fourth aspects, the position and / or length of the interval between the broken line segments in the image line is random. It is a formed body.

According to a sixth aspect of the present invention, in the first, third, and fourth aspects, the length of the interval between the broken line segment in the image line becomes longer as it goes in a certain direction. The image forming body.

A seventh invention of the present invention is the image forming body according to the first, third and fourth inventions, wherein the length of the broken line segment in the image line becomes shorter as it goes in a certain direction. .

According to an eighth aspect of the present invention, there is provided an image according to the first, third and fourth aspects, wherein a specific curve is used as a basic line, and an interval between the broken line segment is provided on the basic line. It is a formed body.

Even if a part or all of a plurality of line drawings are overlapped, the present invention can make moire inconspicuous in the overlapped portion, and can also be a printed copy by a high-precision copying machine, or a professional plate-making camera or It is possible to obtain an image forming body such as a precious printed matter having a high anti-counterfeit effect, which does not allow the production of a counterfeit printed matter using a high resolution scanner and general plate making equipment.

In addition, the present invention makes it possible to freely select the colors of a plurality of line drawings, so that even if a plurality of line drawings overlap, moire does not stand out. For example, even if the color of a plurality of line drawings is dark, for example, both are brown or black, moire does not stand out.

Furthermore, the present invention makes it possible to freely select an angle of an image line that constitutes one line image and an angle of an image line that constitutes the other line image with respect to the line image, and thereby, Even if a plurality of line drawings overlap, moire does not stand out. For example, even if the angles of the drawing lines constituting the plurality of line drawings are substantially the same, even if the plurality of line drawings overlap, the moire does not stand out.

The method of constructing the image forming body of the present invention is not limited to printing such as offset printing, intaglio printing, gravure printing, screen printing, flexographic printing, and can draw or reproduce line drawings such as engraving with a needle or laser. Any method can be used.

The best mode for carrying out the present invention will be described with reference to the drawings. However, the present invention is not limited to this, and various other implementations are possible within the scope of the technical idea described in the claims. Possible forms.

Although the present invention can be configured by superimposing two or more line drawings, in order to simplify the description, in the following, two lines of the first line drawing (1) and the second line drawing (3) will be described. A case where line drawings are superimposed will be described.

FIG. 1 is a diagram illustrating the first line drawing (1). The first line drawing (1) is a line drawing composed of a symbol part and a background part, and is composed of a symbol part drawing line (2a) and a background part drawing line (2b), respectively. FIG. 2 is a diagram illustrating the second line drawing (2). The second line drawing (2) is a line drawing like a tint block pattern, and is constituted by the drawing line (4).

FIG. 3 is a diagram in which parts of the first line drawing (1) and the second line drawing (3) are arranged so as to overlap each other, and the background line drawing (2b) of the first line drawing (1) and the second line drawing (1) are arranged. The line (4) of the two line drawings (3) overlaps in the overlap region (5). FIG. 4 is an enlarged view of the overlapping region (5) in FIG. As shown in FIG. 3, when a plurality of line drawings are simply arranged so as to overlap each other, moire generated by interference between the line drawings becomes conspicuous, resulting in a design defect.

The configuration of the present invention that solves the problem due to the moire has a curved line (4) of the second line drawing (3) in the superposed region (5). FIG. 5 is a diagram when the image line (4) of the second line image (2) is a wavy line. With this configuration, moire becomes inconspicuous and problems due to moire can be solved. In FIG. 5, one wavy line is presented as a representative of the curve, but the curve referred to in the present invention is not limited to this, and the wavy line may be a sine wave having a constant frequency, amplitude, and phase, It may be a sine wave whose frequency, amplitude, and phase change gradually. Desirably, the line (4) of the overlapping region (5) is preferably a curve that emphasizes a frequency component different from the frequency component mainly included in the line (4) of the region other than the overlapping region (5). The individual image lines (6) constituting the line image need not be limited to curves having substantially the same shape, and the individual image lines (6) may be curves having different shapes.

In addition, another configuration of the present invention that solves the problem caused by moire is that in the overlapping region (5), all or part of the image line (4) of the second line image (3) is a broken line.

FIG. 6 is a diagram in which the image line (7) of the overlap region (5) is composed of a solid line (8) and a broken line (9). The broken line (9) is composed of the line segment (10) and the interval (11), and the length (d1) of the line segment (10) and the length (d2) of the interval (11) are constant. .

FIG. 7 is a diagram in which the image line (12) of the overlapping region (5) is composed of a solid line (13) and a broken line (14). The broken line (14) is composed of a line segment (15) and an interval (16), and the length (d3) of the line segment (15) is constant, but the length (d4) of the interval (11) is constant. In this configuration, the length is gradually increased in the direction (right direction in the drawing).

FIG. 8 is a diagram in which the image line (17) of the overlap region (5) is composed of a solid line (18) and a broken line (19). The broken line (19) is composed of a line segment (20) and an interval (21), and the length (d6) of the interval (21) is constant, but the length (d5) of the line segment (21) is constant. The configuration is such that it gradually shortens in the direction (right direction in the drawing).

FIG. 9 is a diagram in which the image line (22) of the overlapping region (5) is composed of a solid line (23) and a broken line (24). The broken line (24) is composed of the line segment (25) and the interval (26), and the length of the line segment (25) and the position and length of the interval (26) are random.

FIG. 10 is a diagram in which the image line (27) of the overlapping region (5) is composed of a solid line (28) and a broken line (29). The broken line (29) is composed of a line segment (30) and an interval (31). The interval (31) has a specific curve (32) as a basic line and is present on the basic line. It is.

FIGS. 11 to 15 show that the line (4) of the second line drawing (3) is a curve like a wavy line in the superposed region (5), and further has the configuration shown in FIGS.

As shown in FIGS. 6 to 15 described above, in the overlapping region (5), all or part of the image line (4) of the second line image (3) is a broken line. The problem can be solved. The effect of the present invention is obtained by setting all or part of the image line (4) of the second line image (3) as a broken line in the superposed region (5). It is not limited to what was shown to ~ 15. The broken line referred to in the present invention may be one in which a plurality of line segments and a plurality of intervals arranged according to a certain rule are repeated, for example, a one-dot chain line or a two-dot chain line.

10 and 15, a single wavy line is presented as a representative curve. However, the curve as a basic line in the present invention is not limited to this, and a sine having a constant frequency, amplitude, and phase. It may be a wave or a sine wave whose frequency, amplitude, and phase change gradually. The individual basic lines need not be limited to curves having substantially the same shape, and may be curves in which the individual basic lines have different shapes.

FIG. 16 shows that the line (4) of the second line drawing (3) is a wavy line in the overlapping region (5), and part of it is a broken line. The interval between the segment is the configuration of the present invention configured to exist on the wavy line as the basic line. FIG. 17 shows the image line (4) of the second line image (3), the background portion (2b) of the first line image (1), and the image line (2) of the second line image (3) configured as shown in FIG. FIG. 4 is a diagram in which 4) overlap with each other in the superposition region (5). With this configuration, the first line drawing (1) and the second line drawing (3) can be naturally formed without making the moire conspicuous while having the element as a line drawing having an anti-counterfeit effect. Could be placed.

In the description so far, the case where the configuration of the present invention is applied to the image line (4) of the second line image (3) has been taken up. However, the present invention is not limited to this, and the first line image (1 ), The configuration of the present invention may be applied to the image line (2b). When two or more line drawings are overlapped, the configuration of the present invention may be applied to each line image. Good.

By the way, moire occurs when regularly arranged points, rows, lines and the like are overlapped. In the present invention, in consideration of the characteristics of the moire, an image line of an area where an image line of one line drawing overlaps with an image line of another line drawing is displayed in an area where an image line of another line drawing does not overlap. By using a curve that emphasizes frequency components that are different from the frequency that is mainly used, and / or making the solid line a broken line, the regularity of the arrangement of the image lines is reduced, the number of places where moire occurs is reduced, or moire is less noticeable. It is a thing.

It is a figure showing a 1st line drawing. It is a figure showing a 2nd line drawing. It is the figure which piled up the 1st line drawing and the 2nd line drawing. FIG. 4 is an enlarged view of FIG. 3. It is a figure which shows the structure of the drawing line of this invention. It is a figure which shows the structure of the drawing line of this invention. It is a figure which shows the structure of the drawing line of this invention. It is a figure which shows the structure of the drawing line of this invention. It is a figure which shows the structure of the drawing line of this invention. It is a figure which shows the structure of the drawing line of this invention. It is a figure which shows the structure of the drawing line of this invention. It is a figure which shows the structure of the drawing line of this invention. It is a figure which shows the structure of the drawing line of this invention. It is a figure which shows the structure of the drawing line of this invention. It is a figure which shows the structure of the drawing line of this invention. It is a figure which shows the structure of the drawing line of this invention. It is the figure which overlap | superposed the 1st line drawing and the 2nd line drawing by the structure of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st line drawing 2a Image line 2b of 1st line drawing Background line 3 of 1st line drawing 3 2nd line drawing 4 2nd line drawing line 5 Overlapping area 6 Image line which comprises line drawing 7, 12, 17, 22, 27, 33, 38, 43, 48, 53 Lines 8, 13, 18, 24, 28, 34, 39, 44, 49, 54 in the polymerization region Solid lines 9, 14, 19, 24, 29, 35, 40, 45, 50, 55 Dashed lines 10, 15, 20, 25, 30, 36, 41, 46, 51, 56 Dashed line segments 11, 16, 21, 26, 31, 37, 42 47, 52, 57 Intervals between broken lines 32, 58 Base lines d1, d3, d5, d7, d9, d11, d13, d15 Lengths of broken line segments d2, d4, d6, d8, d10, d12, d14, d16 Length of broken line interval

Claims (5)

A first line drawing constituting the design part and the background part;
The design part is formed by a plurality of design part drawing lines, the background part is formed by a plurality of background part drawing lines,
The background part has an overlapping area for emphasizing the outline of the pattern part and the background part,
The overlapping region has the plurality of background portion drawing lines arranged in a predetermined direction, and a second line drawing overlapping the plurality of background portion drawing lines,
The image forming body according to claim 2, wherein the second line drawing is formed of a curved broken line.   2. The outline region according to claim 1, wherein the overlapping region includes a contour auxiliary image line that overlaps the plurality of background image lines arranged in a predetermined direction at a predetermined angle. Image forming body.   The image forming body according to claim 1, wherein the second line drawing is composed of a line-like drawing line. The broken line is
i) The position and / or length of the interval between the broken line segments is random.
ii) The length of the interval between the broken line segments becomes longer as it goes in a certain direction.
iii) The length of the broken line segment becomes shorter as it goes in a certain direction.
The image forming body according to any one of claims 1 to 3, wherein the image forming body is formed by any one of i) to iii). The first line drawing and the second line drawing, image forming body according to any one of claims 1 to 4, characterized in that it consists of the intaglio image line.

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