JP3028550U - Color copy machine compatible anti-counterfeit paper - Google Patents

Abstract

(57) [Abstract] [Problem] In the conventional line-and-dot method of anti-counterfeit paper,
With the latest color copying machines, halftone dots are reproduced along with lines, and latent images may not be clearly identified. SOLUTION: The background 2 is about 50 to 60 lines and about 15% parallel lines.
Is printed, and the latent image 3 is printed with halftone dots of about 50 to 80 lines and 15%.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to an anti-counterfeit paper corresponding to a certain type of color copying machine, which reproduces a latent image or background formed by halftone dots that cannot be reproduced by a normal color copying machine when copied.

[0002]

[Prior art]

 To prevent forgery and alteration by copying, print a latent character image such as "copy", "reproduce", "VOID" on the surface of the paper, and make sure that the latent image appears when you apply it to a copying machine and that it is a copy. The technique for making the information known is conventionally known (see, for example, Japanese Examined Patent Publication No. 64-5835 and Japanese Utility Model Publication No. 5-20547).

In each of the above-mentioned conventional techniques, the background and the latent image are printed on the surface of the paper by a combination of lines and halftone dots. There is an advantage that the latent image can be clearly recognized because the appearance of is dark. According to this conventional technique, the lines are 50 or 60 lines 10% and the halftone dots are about 150% 10%. Therefore, when the lines are applied to a color copying machine, the lines are reproduced as they are. Since is not reproduced, there is a difference in shade between the two, and the appearance is that a latent image appears.

[0004]

[Problems to be solved by the device]

 In other words, the conventional technology was based on the principle that halftone dots with the above-mentioned numerical values fly off by using the limit of resolution of color copiers. Since the halftone dot part of the above numerical value is not detected as a dot but as a density, the phenomenon that the halftone dot does not fly and is reproduced as a density occurs when copying and the distinction between the latent image and the background is made. The problem is that it is not clearly visible.

The present invention is for coping with such a latest color copying machine. Contrary to the prior art, copying is performed without taking the method of flying when halftone dots copy. Occasionally, there is a difference in the way lines and halftone dots appear, and the aim is to provide anti-counterfeit paper that allows the latent image to be distinguished from the background.

[0006]

[Means for Solving the Problems]

 Therefore, in the present invention, the dot or the background of about 10% of 150 lines is not detected as a dot, but since it is detected as a density, the latent image or background consisting of the above-mentioned dot is a background consisting of lines of about 50% 10%. Alternatively, it is a forgery-preventive paper for a color copying machine that appears together with a latent image. A background or latent image is printed with a line of 50 to 60 lines and 15%, and a screen of 50 to 85 lines and 15%. The main purpose is to print a latent image or background with dots.

[0007]

[Embodiment of device]

 The one shown in FIG. 1 is the anti-counterfeit paper of the present invention in which the background 2 is printed on the surface of the paper 1 with lines and the latent image 3 is printed with halftone dots. The halftone dot of image 3 is also 15% at 50 lines. In the figure, the latent image 3 is represented by the letter "M", but in practice, specific words such as "copy", "invalid", "fake", and "VOID" are used. The parallel lines in the background 2 have the same number of lines as the conventional anti-counterfeit paper, but the halftone dots of the latent image 3 are considerably larger than the conventional 150 lines. Since this Fig. 1 is an enlarged view, lines and dots are clearly identified, but since these are originally imprinted as fine lines and dots of the same color on the paper surface, the latent image 3 is It is not easily identified as background 2 (see Figure 2).

It should be noted that the numerical value of the parallel line is preferably about 50 to 60 lines, but the numerical value of 50% for the halftone dot value of 15% is preferably given a range of choice depending on the size of the latent image 3 and the like. For example, even if the number of lines is about 65 or 85, the desired effect can be obtained.

FIG. 3 shows a state in which the paper of FIG. 2 is copied by the latest color copying machine. In the copy paper 11, the background 12 appears in dark color and the latent image 13 appears in light color. , The latent image 13 was clearly recognized due to the difference in density. Especially when the lines in the background 12 match the exposure direction of the copying machine, they are clearly visible as solid lines.

That is, it is said that the latent image 13 consisting of halftone dots of 15% in 50 lines appears lighter than the background 12 consisting of lines due to incomplete reproduction of halftone dots by a copying machine and poor three-color registration. Thus, unlike the conventional method, the halftone dots are not almost scattered. Therefore, it is possible to reproduce it, but it will appear in a way that is clearly different from the lines, and the existence of the latent image 13 can be recognized by anyone due to the contrast.

Originally, the smaller the halftone dot is, the more the halftone dot applied to the copying machine is not reproduced (flying). It is highly probable, but if the halftone dot is too small, the contrast with the lines becomes conspicuous and the existence of the latent image becomes obvious. This is inconvenient, and even if an overprint pattern is applied or a camouflage pattern is incorporated, a latent image may be recognized on the paper before copying, causing a problem. Therefore, in the past, the halftone dot value was set to about 10% for 150 lines, but since the copier has been improved with the daily progress, the dots of 150 lines are not detected as dots, but are detected as density. , Therefore, a problem arises in that both the lines and halftone dots are reproduced and the latent image / or background formed by the halftone dots cannot be clearly distinguished from the background / or latent image formed by the lines. The present invention succeeds in solving the problem by adopting a method in which halftone dots are reproduced imperfectly and providing a difference in light and shade from the lines.

The copying machine perceives the halftone dots having a numerical value of 50% of the above-mentioned 50% as a dot, but the individual dots are partly exposed and partly not exposed, which is, so to speak, more accurate than at the time of printing. As a result, the appearance of the color is unnatural, and as a result, the whole appears to appear pale, and the line is clearly distinguished from the line appearing in the dark color. Specifically, each halftone dot appears as some random dotted line objects as shown.

In the above embodiment, the background 2 is formed by lines and the latent image 3 is formed by halftone dots. On the contrary, the background 2 is formed by halftone dots and the latent image 3 is formed by lines. May be. Also, since the number of halftone dots is the same as the number of lines, the surface of the paper before copying is less noticeable than the conventional set of fine dots, but when hiding the latent image 3, the decorative pattern is overlaid with a light color ink. There is no difference from the conventional method that means such as printing or incorporating a camouflage pattern can be taken.

[0014]

[Effect of device]

 The present invention as described above has the following effects. (1) Halftone dots with the number of lines of 50 to 85 are detected as dots by the latest color copying machines, but the three-color registration of red, blue, and yellow that the copying machine has is poor and the halftone dot reproducibility is poor. Depending on the completeness, the halftone dots are partially reproduced, and thus appear to appear thin overall. On the other hand, since the lines show up in a dark color, the contrast between them becomes remarkable, and the latent image formed by halftone dots or lines is clearly visible, and it becomes clear that the latent image is a copy. Therefore, it is possible to prevent forgery and alteration. (2) Since the halftone dots of 150 lines in the prior art are very fine, the latent image or background formed by the halftone dots may be easily distinguished from the background or latent image formed by 50 lines. However, since the halftone dots of the present invention have the same size or almost the same size as the lines, the printed latent image is not conspicuous and the surface of the paper looks uniform and looks good. (3) The background and latent image can be printed by one-color printing as before, and since the halftone dots are larger than before, there is an advantage that the printing work is correspondingly easier, and a special printing means is taken. Since it is not a thing, there is a real benefit that it can be offered at a low price.

[Brief description of drawings]

FIG. 1 is an enlarged view of a paper of the present invention.

FIG. 2 is a plan view of a paper of the present invention.

FIG. 3 is a plan view showing a state in which the paper of FIG. 2 is copied by a latest color copying machine.

[Explanation of symbols]

 1 paper 2 background 3 latent image

Claims (1)

[Scope of utility model registration request] 1. A latent image consisting of halftone dots of the numerical value or a background consisting of lines of about 50% 10% when copying is made because the halftone dot of about 150% 10% is not detected as a dot but it is detected as a density. Alternatively, the anti-counterfeit paper corresponding to the color copying machine which appears together with the latent image is 50 to 60
Print the background or latent image with a line of about 15% line, 50 to 8
An anti-counterfeit paper compatible with a color copying machine, which prints a latent image or a background with halftone dots of about 15% on 5 lines.