JPH0315338Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention uses paper with a warning character latent image that cannot be seen with the naked eye but is visible when placed in a copying machine, distinguishing it from the background. This invention relates to a full-range functional copy counterfeit prevention paper in which warning characters are clearly recognized regardless of the situation.

(Conventional technology) ``VOID'' on the surface to prevent forgery due to copying
Various paper sheets have been proposed in which warning characters such as "copy" are printed in advance, and when the paper is run through a copying machine, the warning characters appear and the paper is recognized as a copy. For example, the technology disclosed in Japanese Patent Publication No. 58-47708 is one of them. By the way, with this technology, the background and warning letters printed on the paper are made up of fine halftone dots, but because the halftone dots between the background and the warning letters are different in size and density, when the paper is printed on a copying machine, It is intended that the two be visually recognized as distinct so that one is reproduced and the other is not.

(Problem to be solved by the invention) Conventional paper with the above structure is configured so that warning characters are visible when copying under the normal density of a copier, so as the density is adjusted lower, the warning text is displayed. The existence of letters becomes diluted. In other words, as a result of the rapid development of copying machines, the adjustment range of shading has expanded more than ever before, and when copying with a lower density adjustment, the content printed or written on the paper is reproduced, but both the background and warning letters are reproduced. will no longer be
Therefore, in this case, there is a concern that the desired effect of preventing copy forgery may not be achieved.

(Means for solving the problem) This invention is intended to function over the entire range of copier density in view of the above-mentioned conventional paper.
That is, a gradation printing layer 3 incorporating a camouflage pattern C to make it difficult to distinguish between the latent image and the background is overlaid on a latent image printing layer 2 on which a latent image A and a background B made up of countless minute particles are applied. This is a fully functional copy counterfeit prevention paper made by printing.

(Example) Latent image printing layer 2 of ink printing applied on the surface of the base material 1
is composed of a latent image A consisting of a warning character displaying "copy" and the surrounding background B, and the latent image A
is a collection of granular microscopic particles of about 10% of 150 lines, and background b is a collection of thin linear microscopic particles of about 10% of 50 lines. A gradation printing layer 3 is provided on the upper surface of the latent image printing layer 2, and this printing layer 3 makes it difficult to distinguish between the latent image A of the latent image printing layer 2 and the background B. That is, the gradation printing layer 3 is formed on the latent image printing layer 2 using a 150 degree halftone gradation plate 4 incorporating a complicated camouflage pattern C.
It is overprinted in a blue color similar to PANTONE 305, and the camouflage pattern C dazzles the naked eye, making the boundary between latent image A and background B unclear and difficult to distinguish between the two. However, if you copy, the camouflage pattern Since the pattern C has a light tone, it is not reproduced and the latent image A and the background B can be easily distinguished. As shown in the fourth diagram, the gradation plate 4 has zero halftone dots at the upper end, but gradually moves towards the lower part to 20%, 30%, etc.
Since the densities are 40% and 50%, the surface of the base material 1 is also printed light on the top and dark on the bottom.

Note that if the density of the gradation plate 4 is made to be darker in the center and gradually lighter toward the top and bottom, the surface density of the base material 1 will also have a similar distribution. Further, as the gradation plate 4, in addition to the halftone gradation plate as described above, a continuous tone solid gradation plate may be used.

However, in the above embodiment, the gradation printing layer 3 is formed on the upper surface of the latent image printing layer 2, but the same effect can be achieved even if the gradation printing layer 3 is underprinted on the lower surface of the latent image printing layer 2. The purpose can be achieved (see Figure 6).

(Effect of the invention) Since the latent image printing layer 2 applied to the surface of the base material 1 can partially suppress the reflectance by the gradation printing layer 3, it is possible to suppress the reflectance of the latent image printing layer 2 on the surface of the base material 1 regardless of the density of the copy. A latent image A always appears at that location. In the above example, the warning character displayed as "copy" is 150 lines long.
Due to the granular fineness of about 10%, it cannot be reproduced with the density of a normal copying machine and appears whitish after copying, but 50 lines 10
The background B, which is made up of thin line-like particles of about 100%, is reproduced so that it appears black, and the word "copy" can be clearly recognized due to this difference in brightness. As the copying machine density becomes lighter, the reproducibility of the background B weakens and the boundary with the latent image becomes unclear, but the gradation printing layer 3 overprinted on the latent image printing layer 2 allows Since the high part overlaps with the background B, the background B in this part is reproduced, and as a result, the latent image A is clearly recognized. The gradation plate 4 in the above embodiment has a light upper part and a darker lower part, so when the copying machine density is set to the lowest, the "copy" warning character is placed at the bottom of the copy paper as shown in Figure 5, and the highest density is set. It appeared clearly in the upper part in the case of the case, and in the middle part in the case of the normal case.

Note that the shapes of the latent image A and the background B are not limited to the shapes of the embodiments, so it goes without saying that the configuration can be such that the latent image is reproduced but the background is not reproduced.

As described above, this invention has a remarkable effect in that it helps prevent forgery in copying because the latent image A appears anywhere on the paper over the entire range of shading in the copying machine.

[Brief explanation of drawings]

FIG. 1 is a plan view of an embodiment of the paper of the present invention, FIG. 2 is a sectional view of the same, FIG. 3 is a partially enlarged plan view of the latent image printing layer, and FIG. 4 is a plan view of the gradation plate. FIG. 5 is a partial plan view of a copy of the original paper, and FIG. 6 is a sectional view showing another embodiment of the invention. A...Latent image, B...Background, 2...Latent image printing layer,
C...Camouflage pattern, 3...Gradation printing layer.

Claims (1)

[Claims for Utility Model Registration] 1. A gradation in which a camouflage pattern is incorporated to make it difficult to distinguish between the latent image and the background in a latent image printing layer on which a latent image consisting of countless microscopic particles and a background are applied. Full-area functional type anti-counterfeiting paper made by overprinting printing layers. 2. The paper according to claim 1, wherein the gradation printing layer is overprinted on the upper surface of the latent image printing layer. 3. The paper according to claim 1, wherein the gradation printing layer is underprinted on the lower surface of the latent image printing layer.