JP3008452U - Copy forgery protection paper - Google Patents

Abstract

(57) [Abstract] [Purpose] The contact between the character latent image and the background is smoothed to fill the space, making the character latent image inconspicuous and improving the appearance of the paper surface so that it can be applied to a wide range of documents. [Structure] A printing paper comprising a latent character image 2 composed of a fine pattern and a background 3 composed of a fine pattern,
40% of 150 lines on the outer and inner edges of the latent image 2
About 60% of net cover 4 is installed alongside.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a copy forgery prevention paper in which a contact between a latent character image and a background is smooth.

[0002]

[Prior art]

 The character latent image and the background displayed as "VOID" and "COPY" etc. were printed using small and large dots or fine patterns such as halftone dots and lines, and it was difficult to distinguish the character latent image from the background with the naked eye. Copy forgery prevention paper is known (see, for example, Japanese Patent Publication No. 58-47708 and Japanese Patent Publication No. 5835).

The former of the above techniques prints a character latent image 11 displaying “VO ID” on the surface of the base paper 10 using large dots as shown in FIG. 3, and also prints a white background portion other than “VOID”. In addition to printing the background 12 using small dots, the cam latent pattern (not shown) was incorporated into the entire character latent image 11 and background 12 to make it difficult to distinguish the character latent image 11 and background 12. It is a thing. When the paper constructed in this way is applied to a copying machine, the large halftone dots are reproduced and the character latent image 11 becomes a dark color. However, the small halftone dots are not reproduced and the characters are outlined, so that the contrast between the two causes the characters to appear. As a result of making the latent image 11 clear and notifying that the paper is a copy, forgery is prevented in advance.

In the latter technique, as shown in FIG. 4, a character latent image 21 labeled “COPY” is printed on the surface of the base paper 20 using a line, and halftone dots are printed on a white background other than the character latent image. The background 22 is printed by using, and a decorative pattern (not shown) is overprinted on the character latent image 21 with a light color ink. When the paper constructed in this way is applied to a copying machine, the latent image 21 composed of lines is reproduced and becomes dark, whereas the background 22 composed of halftone dots is not reproduced and thus becomes light. However, since the character latent image 21 is clearly identified by the contrast between the two, the fact that the paper has been copied is notified, and as a result, forgery can be prevented.

[0005]

[Problems to be solved by the device]

 By the way, the former technique hides the character latent image by incorporating a camouflage pattern that divides the halftone dots that make up the latent character image 11 and the background 12 because there is an extreme difference in size. Since there is an empty space at the contact point, even if a camouflage pattern is installed, the empty space is noticeable, and that area appears as a ground color, which is a disadvantage to the appearance. This technique has a drawback that the appearance of the character latent image 11 becomes unclear when a copy is made because a camouflage pattern is incorporated. Therefore, depending on the printed matter, the camouflage pattern may not be provided. In that case, there is a problem that the character latent image 11 is easily distinguished from the background 12 due to the contrast of large and small halftone dots and the vacancy of contact points.

In the latter technique, therefore, the character latent image 21 and the background 22 are symmetrically configured by a combination of different figures such as lines and halftone dots, and a light color is used to hide the character latent image 21 from the naked eye. It is a means of overprinting decorative patterns with ink. Since the lines are straight lines, if there is a space at the point of contact with the halftone dot, the space will be conspicuous over a wide area, and even if the pattern is overprinted, the space will be visible to the naked eye depending on the color of the ink. This technology is used for various documents because it has the advantage that lines can be easily reproduced by copying and the contrast between the latent image 21 and the background 22 becomes remarkable. In that case, however, it is possible not to provide a light-colored pattern. Therefore, if there is a space between the halftone dot and the parallel line, there is a problem that the character latent image 21 is likely to be visually recognized in advance.

The present invention has been made in consideration of such a conventional technique, and an object thereof is a character composed of a combination of fine patterns of halftone dots and halftone dots or halftone dots and lines. The purpose of the present invention is to provide a copy forgery prevention paper which eliminates the gap between the contact point of the latent image and the background in a natural manner and makes it difficult to distinguish the latent image of the character from the background and can be applied to a wide range of documents.

[0008]

[Means for Solving the Problems]

 To achieve the above object, the present invention comprises one of a character latent image and a background provided on the surface of a base paper with a fine pattern reproduced by a copying machine, and the other with a fine pattern not reproduced by a copying machine. For printing paper where it is difficult to distinguish between the latent character image and the background with the naked eye, a mesh cover of about 40% to 60% 150 lines is installed along the entire outer and inner edges of the latent character image. is there.

[0009]

[Action]

 The net covers along the outer and inner edges of the character latent image intervene in the space between the character latent image and the background. Although the net cover is formed integrally with the character latent image, it is in close contact with the fine pattern that constitutes the background and is buried between the character latent image and the background.

Since one of the fine patterns is reproduced by the copying machine and the other is not reproduced, the difference in density between the two becomes clear when the copy is made, and the character latent image becomes clear due to the contrast between the character latent image and the background color. . It should be noted that the network cover of about 40% to 60% of 150 lines is not reproduced by the copying machine.

[0011]

【Example】

 FIG. 1 shows a paper of the present invention in which a character latent image 2 consisting of a fine pattern marked as “invalid” and a background 3 consisting of a fine pattern on a portion other than the character latent image are provided on the surface of a base paper 1. The fine pattern forming the character latent image 2 is a halftone dot, and the fine pattern forming the background 3 is a line.

The halftone dots of the character latent image 2 are about 10% for 150 lines, and the parallel lines on the background 3 are about 10% for 50 lines. When applied to a copying machine, halftone dots of about 150 lines and about 10% are not reproduced, and conversely about 50% lines of about 10% are reproduced. However, both are usually fine shapes and must be observed carefully. The character latent image 2 and the background 3 are not distinguished.

A mesh cover 4 of about 40% to 60% 150 lines is provided along the entire outer and inner peripheries of the character latent image 2 to close the space between the background 3 and the character cover 2. That is, the lines forming the background 3 have a constant interval, and a space is likely to be formed at the contact point between the lines and the halftone dots forming the character latent image 2.

For example, when the outline of a horizontal stroke of “invalid” in the figure and the line are coaxial with each other, a space is generated between the line above and below the line and the outline. However, there is a concern that the vacant portions become ground-colored and are clearly recognized by the naked eye, the appearance of the paper is impaired, and the existence of the latent character image 2 is identified. However, as described above, in the paper of the present invention, the net cover 4 is provided along the entire outer and inner peripheries of the character latent image 2, so that the open space between the halftone dot and the line contact is closed, and the part is gently rolled. It is formed.

FIG. 2 shows the paper of the present invention applied to a copying machine. The "invalid" character latent image 2 appears in a light color and the background 3 appears in a dark color on the copy paper 1a. The mesh cover 4 is also not reproduced and is completely integrated with the character latent image 2, and the contrast between the "invalid" character latent image 2 and the background 3 becomes remarkable, so that it is apparent that it is a copy.

In the above embodiment, the fine pattern of the character latent image 2 is a halftone dot, and the fine pattern of the background 3 is a line. On the contrary, the character latent image 2 is a line and the background 3 is a halftone. It may be a dot, and in that case, when it is applied to a copying machine, the character latent image 2 is reproduced in a dark color, and the background 3 is not reproduced and becomes a light color.

Further, the fine patterns forming the latent character image 2 and the background 3 are not restricted by the halftone dots and the lines. For example, the large halftone dots are reproduced by the copying machine and the small halftone dots are not reproduced by the copying machine. The character latent image 2 and the background 3 can also be formed with large and small halftone dots by selecting a large one.

Thus, the character latent image 2 is overprinted with a decorative pattern using a light-color ink that cannot be reproduced by a copying machine, or a camouflage pattern is incorporated into the character latent image 2 and the background 3 so that the character latent image is printed. The image 2 can be further hidden, but these also belong to the free implementation scope of the present invention.

[0019]

[Effect of device]

 The present invention as described above has the following unique effects. (1) The mesh cover naturally fills the contact points between the character latent images and the fine patterns forming the background, so that there is no possibility of conspicuous voids as in the past, and the surface of the paper is kept clean. (2) Since the character latent image and the background are gently fused by the net cover and the naked eye is dazzled to make it difficult to identify the character latent image and the background, the appearance of the paper surface is good and it can be applied to a wide range of documents. (3) It is free to overprint a decorative pattern or incorporate a camouflage pattern into the latent character image. In that case, the contact between the latent character image and the background is inconspicuous and the latent image hiding effect is further promoted. It (4) The net cover is formed integrally with the character latent image, and does not require special steps for production.

[Brief description of drawings]

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

FIG. 2 is a plan view of a copy of the sheet of FIG.

FIG. 3 is a plan view of a conventional sheet composed of large and small halftone dots.

FIG. 4 is a plan view of a conventional sheet composed of halftone dots and lines.

[Explanation of symbols]

 1 Base paper 2 Character latent image 3 Background 4 Net cover

Claims (1)

[Scope of utility model registration request] 1. One of a character latent image 2 and a background 3 provided on a surface of a base paper 1 is composed of a fine pattern reproduced by a copying machine,
On the other side of the printing paper, which is made up of a fine pattern that cannot be reproduced by a copying machine and which makes it difficult to distinguish the character latent image 2 from the background 3 with the naked eye, 150 lines 40% at the entire outer and inner edges of the character latent image 2. A copy forgery prevention sheet provided with a net cover 4 of about 60%.