KR100574871B1 - Printed document resistant to copying and computer pringting, method of preparing the same, and method of verifying a couterfeit by a filter - Google Patents

Abstract

Disclosed is a counterfeit preventing paper by copying and computer printing, a method of manufacturing the same, and a method of checking forgery using a filter recognizer. According to the present invention, there is provided a method of manufacturing a counterfeit preventing paper by copying and computer printing, the method of manufacturing a counterfeit preventing paper by copying and computer printing comprising a film manufacturing step and a printing step, any one of a latent image pattern and a background pattern. Is formed by a dotted line, the corresponding latent image pattern or a background pattern is formed by a full line, the dotted line and the full line are arranged at different angles, and the dotted line is a screen tone bow of 150 to 200 lines and a screen density of 12 to 16%. Wherein the full line has a screen tone bow of 65 to 85 lines and a screen concentration of 14 to 18%. Copying and computer forgery prevention paper according to the present invention is difficult to visually identify the latent image secretary, but when outputting using a color copying machine can be confirmed that the latent image is forged, and whether or not forgery using a filter recognizer In the case of checking the latent image on the non-forged paper, and the latent image is not confirmed on the printed matter by computer printing, it is possible to determine whether the forgery.

Latent pattern, background pattern, line, dash line, filter recognizer

Description

Printed document resistant to copying and computer pringting, method of preparing the same, and method of verifying a couterfeit by a filter}

1 is an enlarged plan view showing an example of a latent image and a man line and a dotted line inserted in the background;

Figure 2 is an enlarged plan view showing another example where the latent image and a line and a dotted line are inserted in the background,

3 is an enlarged plan view showing an example in which a dazzle pattern is added,

4 is a state in which the paper of FIG. 1 is copied;

5 is a state in which the paper of FIG. 2 is copied;

FIG. 6 is an enlarged plan view illustrating an example in which a plurality of latent images and a man line and a dotted line are inserted in the background;

7 is a state in which the paper of FIG. 6 is copied;

8 is an enlarged plan view of a line disposed on a filter recognizer, and

FIG. 9 is a diagram illustrating a latent image ratio on the sheet of FIG. 1 using a filter recognizer. FIG.

♣ Explanation of symbols for main parts of the drawing

10: Background 20: Latent Image

30: dazzle pattern 40: transparent film

50: full line on the filter recognizer 60: upper left background

70: upper left latent image 80: upper right background

90: upper right latent image

The present invention relates to anti-counterfeiting paper by copying and computer printing, a manufacturing method thereof, a method of checking forgery using a filter recognizer, and more specifically, for the purpose of money, securities, passports, cards, gift certificates and security. When copying various papers such as certificates using a copying machine, latent images are displayed.When checking whether a paper is forged using a filter recognizer, a latent image is displayed to prevent counterfeiting by copying and computer printing. A paper, a method for manufacturing the same, and a method for checking whether the paper is forged using a filter recognizer.

With the development of office automation devices, computer peripherals, the emergence of highly reproducible digital color printers (copiers, printers) with resolutions from 800 to 1440dpi, for the purpose of currency, securities, passports, cards, gift certificates and security Various crimes occur, such as easily copying, printing, and forging various certificates.

In order to solve this problem, many anti-counterfeiting methods have been studied. In the past, anti-counterfeiting methods using a special ink such as metal powder and fluorescent ink have been used, but these methods have been implemented. , Securities, etc., as an important document, damaged the dignity, and did not have the effect of preventing copy counterfeiting, and it was easy to purchase special ink on the market.

In addition, afterwards, anti-counterfeiting papers were produced to make latent images appear when copying into large and small dots, full lines and dots. For example, Japanese Patent Laid-Open No. 58-47708 prints a latent character such as "VOID" on the surface of a sheet of paper with a large dot, and the background surface other than the latent image of a letter is printed with a small dot, so that a large amount of paper is copied. Since the latent image of the halftone dot is reproduced and displayed, but the background surface of the small halftone dot is not reproduced, a difference in color between the two colors is generated, and thus the latent image of the letter can be visually confirmed. In addition, in order to prevent the latent image of the character from being identified by the naked eye, when printing the latent image of the character and the background, a dazzle pattern is inserted into the photo work process so that the latent image of the character and the background are naturally connected. However, in the above invention, in order to increase the effect of the appearance of the latent image during copying, it is preferable to maximize the size difference between the halftone constituting the latent image and the halftone constituting the background, but if the size difference of the halftone is too large, a dazzle pattern is applied. Even if there is a problem in that the latent image of the character on the paper before copying is lost, the practicality of preventing the forgery of the paper is lost, and there is a drawback that the shades must be adjusted manually according to the printing plate during film production.

As a supplement to this drawback, there are Japanese Patent Laid-Open No. 62-61943 and Korean Patent Nos. 104762 and 369111. These inventions consist of latent dots, dotted lines, lines, and shapes (equilateral triangles, squares, rectangles), and the background consists of halftones, dotted lines, lines, shapes, and opposite lines. Are arranged at various angles such that 90, 60 degrees, 45 degrees, 30 degrees, and the like with respect to each other. The above-described inventions are superior in reproducibility in copying than dotted dots by forming a dotted line or a graphic of either the latent image and the background, and the appearance of the paper is cleaner than the dotted dots because of the continuous pattern shape by the dotted lines even when a dazzle pattern is inserted. However, the above inventions have a copy counterfeit prevention effect in a color copying machine. However, when printing using a computer, the printed matter exhibits the same state as the original paper due to the manipulation in the scanning process, and thus is treated the same as the paper.

On the other hand, in general, the dotted line area of the film produced by computer graphics and the dotted line area of the paper after printing do not coincide, and the dots of paper after printing are enlarged by the degree of exposure of film or printing plate, pressure, etc. There is. For example, a latent image pattern of 150 dots of a screen tone line and 15% of a screen density in a film produced by computer graphics is printed at 150 lines of a screen tone line and 20% of a screen density at the time of printing. In the background pattern of the film pattern by the thick graphic dot computer graphics, 65 lines of screen tone player and 15% of screen density are printed with 65 lines of screen player and 20% of screen tone density. This phenomenon is called dot gain, and thereby forms an image or shape pattern different from the image or shape pattern of the tones constituting the latent image or the background, resulting in a difference in area ratio before and after film printing. There is a problem that a desired shape pattern and density cannot be expected on a printed sheet.

In order to solve this problem, the prior art adjusts the concentration of phosphorus and ink at the printing stage, and matches the area ratio of the halftone dots constituting the latent image pattern and the background pattern in the paper even upon printing or the paper. Although the area ratio of the dense halftone dot is set in the above, there is a problem in that the adjustment work requires a fairly skilled technique.

Accordingly, the present inventors conducted a study to solve the above problems, when forming a latent image and a background pattern so that the latent image appears when copying and forgery using a filter recognizer, and considering the influence of the dot gain shape It has been found that the above problems can be solved by designing screen density of dotted lines and full lines using computer graphics, and designing a filter recognizer capable of identifying latent images on paper, and the present invention has been completed based on this.

Therefore, an object of the present invention, the latent image on the paper is difficult to identify with the naked eye, but when the paper is detected by the copier, the paper is detected while moving the scanner in the direction of the main scanning line (X axis) and the sub scanning line (Y axis), When the interference occurs due to the change of angle between the dotted line and the dotted line, the dotted line disappears and the latent image is forged regardless of the direction of the paper or the scanning line of the copier. It is to provide a manufacturing method of the anti-counterfeiting paper by copying and computer printing that the latent image is confirmed on the forged paper but the latent image is not found on the forged printer.

Another object of the present invention is to provide a sheet for preventing forgery by copying and computer printing produced by the manufacturing method according to the present invention.

Still another object of the present invention is to provide a method for checking whether a paper, such as money, securities, passports, cards, gift certificates, and various certificates for security purposes, has been forged.

In accordance with an aspect of the present invention, there is provided a method of manufacturing a sheet for preventing forgery by copying and computer printing, the method of manufacturing a sheet for preventing copying by copying and computer printing comprising a film manufacturing step and a printing step, wherein a latent image pattern And one of the background patterns is formed by a dotted line, the corresponding latent image pattern or the background pattern is formed by a zen line, the dotted line and the zen line are arranged at different angles, and the dotted line is 0.02 to 0.035 mm thick, and the interval is 0.07 to Screen tones of 150 to 200 lines of 0.09 mm, 0.15 to 0.3 mm in length, and screen concentrations of 12 to 16%, the full lines are screen lines of 65 to 85 lines of 0.07 to 0.13 mm thick and 0.20 to 0.29 mm apart. And a screen concentration of 14-18%.

When the size of the dotted line is within the above range, the effect of the latent flaw is excellent, and when the size exceeds the above range, there is a problem in that the latent image on the paper is visually confirmed. In addition, in the case of the dotted line interval, if the screen density is exceeded, the screen density decreases so that the size of the dotted line must be largely adjusted. If the size of the dotted line is increased, the latent image on the paper is visually identified. Similarly, when the size of the full line is within the above range, the effect of the latent flaw is most excellent, and when the size exceeds the above range, there is a problem that the latent image on the paper is confirmed by the naked eye. In addition, in the case of the full line interval, when the screen range is exceeded, the screen density decreases, and the size of the full line must be largely adjusted. When the size of the full line is increased, the latent image on the paper is visually identified.

The screen density of the dotted line and the full line is set so that the difference between the screen concentrations of the dotted line and the full line is 2 to 4%, that is, the screen density of the dotted line is 2 to 4% weaker than the screen density of the full line. The reason for this setting is that when the film is printed, the dotted line generates a dot gain phenomenon larger than full line. If the difference between the screen density of the dotted line and the full line is less than 2%, the ink density of the dotted line on the paper becomes higher than the ink density of the full line, so that the pattern composed of the dotted lines is visually identified on the paper. If the difference is greater than 4%, the ink density of the dotted line on the paper becomes lower than the ink concentration of the full line, so that a pattern composed of dotted lines is visually identified on the paper.

Therefore, in order that the dotted line and full line on paper show the same density, and the latent image is not visually recognized, the screen density of the dotted line on the film should be set to 2 to 4% weaker than the full screen size.

Screen density of full and dashed lines and paper ink density after printing Film (screen) density Paper Ink Concentration Remarks Full line 16% 17% No latent image marks due to same ink concentration dotted line 14% 17%

The screen concentration of 12 to 16% of the dotted line and the screen concentration of 14 to 18% of the full line are determined at the limit of reproduction and disappearance at the copier (CAN Corporation CLC 1150).

The dotted line and the broken line should be arranged with respect to each other at various angles such as 10, 20, 30, 40, 50, 60, 70, 80, 90, and the like. The reason why the dotted line and the full line are inclined with respect to each other is because the copier detects the paper while moving the scanner in the direction of the main scanning line (X axis) and the sub scanning line (Y axis) when the paper is detected. It is designed to cause interference.

According to the manufacturing method according to the present invention, a plurality of latent image patterns and a background pattern may be formed on a sheet, and the adjacent patterns may be repeatedly arranged by changing dotted lines and full lines. The paper produced by repeatedly displacing the dotted lines and full lines alternately appears in both negative and positive types when copying, making it easier to identify them, and more clearly when checking forgery using a filter recognizer. .

The manufacturing method according to the present invention may add a dazzle pattern, the line width of the dazzle pattern is preferably 0.3 to 0.5 mm. When the line width is less than 0.3 mm, there is a merit that the dazzle effect is increased, but the effect that the latent image appears during copying is insufficient, and when the dazzle pattern exceeds 0.5 mm, the daze effect cannot be expected and the latent image is visually confirmed. There is a problem. The dazzle effect on the paper is further achieved by forming a latent image pattern and a background pattern using dotted lines and full lines of the same area.

According to the present invention for achieving the above object is a method for checking whether or not the forgery of the anti-counterfeiting paper is characterized in that the presence of a latent image on the paper while maintaining the angle of the filter recognizer 85 to 95 degrees.

The filter recognizer is preferably composed of full lines having screen tones of 150 to 175 lines and screen concentrations of 50 to 80%. The full line on the filter recognizer has the most excellent latent image display effect on the paper when it is within the range, and the latent image does not appear on the paper recognizer even though it is the original paper due to the interference phenomenon on the filter recognizer.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

1 is an enlarged plan view showing an example in which the latent image and a dotted line are inserted into a background of a paper according to the present invention, and FIG. 2 is an enlarged plan view illustrating an example in which the latent image and a dotted line are inserted into a latent image and a background of a paper according to the present invention. 4 is a state diagram in which the paper of FIG. 1 is copied, and FIG. 5 is a state diagram in which the paper of FIG. 2 is copied. As shown in FIG. 1, the background 10 is formed in a zen line, and the latent image 20 is formed in a dotted line. When the paper of Fig. 1 is copied, the dotted line disappears as shown in Fig. 4, but full lines are reproduced so that a "copy" mark on the copy appears in a negative state. The paper of FIG. 2 is composed of a background and a latent image by changing dotted lines and full lines in FIG. According to FIG. 5 showing the state of copying the paper of FIG. 2, the "copy" non-marking is displayed in a positive state as opposed to FIG. 4.

3 is an example in which a dazzle pattern is added to a latent image pattern and a background pattern, and the dazzle effect is further enhanced by further adding the dazzle pattern.

6 is an enlarged plan view illustrating an example of a paper on which a plurality of latent images and a background are formed. As shown in FIG. 6, a plurality of latent image patterns and a background pattern are formed, and dotted lines and full lines are alternately arranged with adjacent patterns. The latent image 70 at the upper left is composed of dotted lines, and the background 60 at the upper left is composed of full lines. On the contrary, the latent image 90 on the upper right is made up of full lines, and the background 80 on the upper right is made up of dotted lines. FIG. 7 shows the result of copying the paper of FIG. 6, in which a portion composed of dotted lines is lost, and a portion composed of full lines is reproduced so that latent images are displayed in negative and positive types.

Fig. 8 shows an enlarged plan view of full lines arranged on the filter recognizer. The filter recognizer is manufactured by forming a line 50 having a 150 to 175 bow and 50 to 80% screen concentration on the PET transparent film 40 and then attaching it to a transparent acrylic plate (thickness: 3 mm). The filter recognizer in which the line is arranged is contacted with the surface while maintaining an angle of 85 to 95 degrees with respect to the paper (line line direction) or the printer material (line line direction) to check whether or not the latent image mark is present. In the case of a non-printed authentic paper, a latent image secretion appears as shown in FIG. 9.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the scope of the present invention is not limited thereto.

Example 1

The dotted lines were arranged with 200 tons of screen tone having a thickness of 0.02 mm, a thickness of 0.07 mm, and a length of 0.15 mm, and a latex pattern was formed by using a computer graphic to prepare a film at a screen concentration of 12% positive type. Full lines were arranged with a screen tone of 85 lines having a line thickness of 0.07 mm and a line interval of 0.20 mm, and a background pattern was formed by making a film with a screen concentration of 14% positive type using computer graphics. After the latent image pattern and the background pattern thus prepared were adjacent to each other, the latent image pattern was angled 20 degrees with respect to the background pattern.

As a result of printing and making a printing plate using the film produced in the above process, the dot gain phenomenon resulted in 15% of the density of dotted lines and full lines on the paper, and there was no difference in the color shade between the latent image pattern and the background pattern on the paper. As a result, latent images were not visually identified. In addition, the latent flaw was not visually identified due to the dazzle effect by the dotted line.

However, as a result of copying by adjusting the copy density stepwise from -3 to +3 (copier adjustment scale) with a color copying machine (canon: CLC 1150) and a black and white copying machine (Document center 551) as shown in FIG. Similarly, full lines were regenerated and dashed lines disappeared so that latent image marks were negative.

Example 2

The dotted lines were arranged with screen tones of 150 lines having a thickness of 0.035 mm, a thickness of 0.09 mm, and a length of 0.3 mm, and a latex pattern was formed by using a computer graphic to produce a film at a concentration of 15% positive type screen tone. Full lines were placed in a screen tone of 65 lines having a line thickness of 0.13 mm and a line interval of 0.29 mm, and a film was produced at a concentration of 17% positive type screen tone using computer graphics to form a background pattern. After the latent image pattern and the background pattern thus prepared were adjacent to each other, the latent image pattern was angled 20 degrees with respect to the background pattern.

As a result of printing and making a printing plate using the film produced in the above process, the dot gain phenomenon resulted in a concentration of 18% of the dotted lines and full lines on the paper, and there was no difference in the color shade between the latent image pattern and the background pattern on the paper. As a result, latent images were not visually identified. In addition, the latent flaw was not visually identified because of the deceptive effect of the dotted line.

However, as a result of copying by adjusting the copy density stepwise from -3 to +3 (copier adjustment scale) with a color copying machine (canon: CLC 1150) and a black and white copying machine (Document center 551) as shown in FIG. Similarly, full lines were reproduced and dashed lines disappeared and latent image marks appeared negative.

Example 3

In order to check whether the paper is forged by using a filter recognizer, the paper of Example 2 and the printed matter printed on the color printer (Epson Stylus Photo 750, etc.) have a 150-line screen tone player and a 50% screen tone density. The presence of latent image marks was confirmed using a filter recognizer composed of full lines. The filter recognizer was in contact with the surface of the paper and the printer object while maintaining an angle of 85 to 95 degrees with respect to the paper (full line direction) and the printer object (full line direction). As a result of the forgery check, a latent latent mark as shown in FIG. 9 was shown in the sheet of Example 2 which was not forged, but the latent latent mark was not shown in the printer material.

As can be seen from the above, the paper produced by the manufacturing method according to the present invention is because the area ratio of the dotted line and the full line constituting the latent image pattern and the background pattern is always constant and its concentration is the same, There is no effect that can be identified. In addition, when copying in a high-resolution color copier, the dotted line is lost and the full line is reproduced so that the size and spacing of the dotted line and the full line are set so that latent image marks appear, thereby preventing counterfeiting through the copier. In addition, when checking for forgery using a filter recognizer, the counterfeit and screen density of the full line on the filter recognizer are set so that the latent image marks appear on the authentic paper, and thus the counterfeit prevention effect by computer printing is achieved. .

Claims (7)

In the manufacturing method of the anti-counterfeiting paper by copying and computer printing comprising a film manufacturing step and a printing step, Any one of the latent image pattern and the background pattern is formed by a dotted line, and the corresponding latent image pattern or the background pattern is formed by a full line, and the dotted line and the full line are arranged at different angles, and the dotted line has a thickness of 0.02 to 0.035 mm, an interval. A screen tone bow of 150 to 200 lines of 0.07 to 0.09 mm, 0.15 to 0.3 mm in length, and a screen concentration of 12 to 16%, and the line is 65 to 85 lines of 0.07 to 0.13 mm thick and 0.20 to 0.29 mm apart. A method for producing a sheet of anti-counterfeiting paper by copying and computer printing, characterized by having a screen tone player and a screen density of 14 to 18%. The method of claim 1, wherein a plurality of the latent image patterns and the background patterns are formed on a sheet, and the adjacent patterns are repeatedly arranged with alternate dotted lines and full lines. . The method of manufacturing a counterfeit preventing paper by copying and computer printing according to claim 1, further comprising a dazzle pattern. The method of claim 1, wherein the line width of the dazzle pattern is 0.3 to 0.5 mm. Paper for preventing counterfeit by copying and computer printing, which is produced by the manufacturing method according to claim 1. A method for checking forgery using a filter recognizer, characterized in that whether or not the latent image on the paper is present while maintaining the angle of the filter recognizer in a range of 85 to 95 degrees with respect to the full line direction of the paper according to claim 5. 7. The method of claim 6, wherein the filter recognizer is arranged with a screen line of 150 to 175 lines and a full line having a screen concentration of 50 to 80%.

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