JPS6381076A - Method of printing negotiable securities incapable of being copied of high accuracy - Google Patents

Abstract

PURPOSE:To make it impossible to copy a negotiable securities with high accuracy, by providing a ground tint of a pattern in the same color as that of a ground area and with a specified density on a paper colored with a low density, further providing a multicolored pattern ground tint, and performing desired printing thereon. CONSTITUTION:A paper colored with a low ground density of 0.1-0.4 is provided thereon with a ground tint pattern 5, 6 in the same color as that of a ground area and with a density higher than the ground density by 0.1-0.3 and a line width of not more than 100mum. The paper is further provided thereon with a ground tint pattern 2, 3, 4 constituted of highly accurate curves in plural colors such as dark green, brown and purple and with a line width of not more than 100mum and a pitch of 100-500mum, and printing necessary for forming a negotiable paper is performed on the paper. In the case of analog color copying of the negotiable paper thus obtained, when density is adjusted to the ground area 1, the high-density ground tint patterned areas 2, 3, 4 are made discernible, whereas when density is adjusted to the high-density ground tint patterned areas 2, 3, 4, it will be impossible to distinguish the ground area 1 and the low-density ground tint areas 5, 6 from each other. In both cases, it is impossible to copy the negotiable securities of high accuracy, and a copy obtained is readily judged as a counterfeit.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a method of printing securities that prevents high-precision copies from being obtained.

(Prior Art) Since high-precision color copies of current securities can be obtained, there is a problem in that the color copies are misused.

(Purpose) It is an object of the present invention to solve the conventional problem of not being able to make an accurate copy when securities are copied in color using the method of the present invention, by making it obvious at a glance that it is a color copy.

(Structure) In order to achieve the above object, the present invention provides a skin density value of 0.1 to 0.
．． On paper with a low density color of 4, a ground pattern with a line width of 100μ or less, which is the same color as the background and has a density value of 0.1 to 0.3 higher, is formed, and in addition, multiple patterns with high precision such as dark green, brown, and purple are formed. The pitch width is 1.00μ to 50 with a curve of 100μ or less in color.
It is characterized by forming a ground pattern with a thickness of 0 μ and performing desired printing on it.

Hereinafter, a detailed explanation will be given based on the illustrated embodiment. FIG. 1 shows a background portion having a low density color with a background density value of 0.1 to 0.4. 2.3.4 is a high-density tint pattern portion having a color higher in density than the background portion 1, such as dark green, purple, or brown, and consisting of a curved pattern with a line width of 100 μm or less and a pitch width of 100 μm to 500 μm. 5.6 is a low-density tint block portion having the same color as the background portion and having a density value 0.1 to 0.3 higher than that of the background portion 1. On top of that, the necessary printing for securities is applied.

Next, the effect will be explained. Generally, there is a relationship between the document and the image density as shown in FIG. When making an analog color copy of the securities shown in Figure 1, if you match the density to the background part 1, the second
As shown in the figure, the high-density background pattern part 2.3.4 is crushed,
When the density is matched to the high-density tint block part 2.3.4, it becomes difficult to distinguish between the background part 1 and the low-density tint block part 5.6, as shown in Figure 3, and high-precision copying is impossible in both cases. It's easy to judge. When a digital color copy is made, the high-density background pattern portions 2.3.4 in FIG. 1 become as shown in FIG. 4 and are judged as copies.

(Effects) According to the present invention, on paper having a low density color with a background density value of 0.1 to 0.4, the same color as the background part and a density value of 0.1 to 0.0.
3. Form a ground pattern with a high line width of 100μ or less, and then form a ground pattern with a pitch width of 100μ to 500μ using multiple highly accurate colors such as dark green, brown, and purple, and a curve with a line width of 100μ or less, and then apply the required amount on top of that. Because the printed securities are printed with
Misuse by copying securities can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the main part of an embodiment of securities produced by the method of the present invention, Fig. 2 is a plan view of an analog color copy with the density matched to the background part of Fig. FIG. 4 is a plan view of an analog color copy in which the density is adjusted to the high density part of FIG. 1, FIG. 4 is a plan view of the digital color copy of FIG. 1, and FIG. 1... Background part 2.3.4... High density background pattern part 5.6... Low density background pattern part

Claims (1)

[Claims] On paper with a low density color with a background density value of 0.1 to 0.4, a line width 10 of the same color as the background but with a density value of 0.1 to 0.3 higher
Form a background pattern of 0μ or less, and then form a background pattern with a pitch width of 100μ to 500μ using multiple highly accurate colors such as dark green, brown, and purple, with a line width of 100μ or less, and then print the desired pattern on top of it. A high-precision printing method for securities that cannot be copied.