JPS625347Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in non-copyable paper, which is made by printing a dark background color surface and a special pattern that confuses characters such as kanji, kana, and numbers.

As a measure to prevent documents that cannot be copied, such as important or confidential documents, from being copied by a copying machine, a masking background is formed on the surface of the paper using a color with light absorption characteristics (a color close to black), and a specific color (blue) is applied on the paper surface. In some cases, characters are recorded using ink so that the recorded characters become illegible after copying, or in some cases, a group of parallel lines in different directions are applied to the surface of the paper, and the characters recorded on the lines are copied. It is known that the line is confused with the Goman line, making it difficult to decipher.

However, in the former method, the background color and the color of the ink used for recorded characters are limited in advance, so it cannot be used in a wide range of applications, and it is not suitable for color copying machines. Due to the combination of lines, depending on the direction of the characters, there is a disadvantage that the recorded characters may be reproduced to some extent even after copying.

The present invention was developed in view of the disadvantages of the prior art as described above, and it has a background color surface that appears black when copying regardless of whether it is a black-and-white or color copying machine, and a special color surface that confuses recorded characters on the background color surface. This paper provides a patterned paper that cannot be copied.

That is, the entire surface of the paper 1 is printed with a background color 2 consisting of 150 lines and 50% dots in sepia-toned ink, and a special pattern 3 is printed thereon, which is made up of a large wavy curve X with one cycle of about 13 mm arranged in a staggered manner using slightly thick lines, a small wavy curve Y with one cycle of about 5 mm arranged in a staggered manner using slightly thin lines, and a combination of vertical and horizontal lattice-like fine dotted lines Z spaced about 1 mm apart. In addition to sepia-toned ink hues, dark colors such as gray and light green are preferable.

As described above, the present invention has a background color plane 2 consisting of halftone dots on the entire surface of the paper 1, and a special pattern 3 consisting of small and large waveform curves Because they are printed with a difference, under normal conditions, the background color surface 2 appears extremely pale and the special pattern 3 appears darker than this, but the characters written on this paper (Fig. (not shown) can be read very clearly.

However, when the above paper is put through a copying machine, the background color surface 2 and special pattern 3 are printed with ink of a dark hue, so regardless of whether the copying machine is black and white or a color copying machine, the paper is copied darkly. The characters written on top are assimilated into special pattern 3 and become unreadable.

In other words, the size waveform curves X and Y of special pattern 3
It assimilates the curved parts and hypotenuses of the characters, and also easily hides the characters with large and small waveform curves X and Y, which have a difference between thick and thin. It not only assimilates the special pattern 3, but also traverses the light-colored area that appeared after copying the background color surface 2, which consists of halftone dots with a remarkable contrast with the special pattern 3, giving the paper a complicated appearance. Pattern 3 allows paper 1 to be printed regardless of the size or thickness of the characters.
The characters written above are impossible to read with the naked eye, making them virtually impossible to copy.

As mentioned above, the original paper is not limited to a specific color of ink as long as it has a dark hue, so it can be used for a wide range of documents, and the background color side 2 and special pattern 3
Since the difference in density does not require the use of different inks or special inks, there is also the practical advantage of manufacturing at low cost and quickly.

[Brief explanation of the drawing]

Figure 1 is a partial plan view of the main paper, Figure 2 is a plan view of the ground color surface, and Figure 3 is an exploded special pattern.A is a large waveform curve, B is a small waveform curve, and C is a vertical and horizontal grid. FIG. 3 is a plan view of each pattern of thin dotted lines. 1 is paper, 2 is background color, 3 is special pattern, X
is a large waveform curve, Y is a small waveform curve, and Z is a vertical and horizontal grid thin dotted line.

Claims (1)

[Scope of utility model registration request] On the surface of the paper, a background color surface consisting of halftone dots is printed using dark ink, and large wavy curves are arranged in a staggered manner using thick lines, and thin lines are used to print a background color surface consisting of halftone dots. Non-copyable paper printed with a special pattern consisting of small waveform curves organized in a staggered manner and further combined with vertical and horizontal lattice fine dotted lines.