JP2577519Y2 - Original film for copy protection printing - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a copy-prevention printing film for producing a printed matter in which a latent image such as a character or a figure, which was not visible until then, appears when a copy is made in order to prevent abuse due to the copy. Regarding the original.

[0002]

2. Description of the Related Art In order to prevent counterfeiting by copying, a latent image indicating that a document has been copied is printed on the surface of paper in advance so that it cannot be recognized.
A printed material is generally known in which the latent image is not recognized by the naked eye, but when copied, the latent image is visually distinguished from the background.
Thus, there is a technique disclosed in Japanese Utility Model Application Laid-Open No. 63-198074 in order to effectively manufacture such a printed matter.
This technology applies a latent image consisting of halftone dots (or lines) and a background consisting of lines (or halftone dots) on the surface of the base plate, and applies a line pattern that intersects the lines together with the latent image and the background. The original film, the printed matter produced using the original film, the latent image is interfered with the background by the linear pattern, so usually the latent image is not discernible to the naked eye, but was applied to a copying machine Sometimes the lines are reproduced and the halftone dots are not reproduced, so that the latent image becomes clear at a glance due to the difference in density between them, and it is easy to know that the printed matter is not a genuine printed matter.

[0003]

In the above prior art, the effect of hiding the latent image and the background is exhibited by the linear pattern, but on the other hand, since the linear pattern is constantly present on the paper surface, it is rather inconvenient depending on the printed matter. was there. The present invention has been made in view of such a conventional problem. The purpose of the present invention is to eliminate the need for an extra pattern, so that the surface is visually recognized smoothly, and the presence of a latent image is usually identified. Without
Conversely, the present invention provides a film master suitable for printed matter in which a latent image clearly appears when copied.

[0004]

In order to achieve the above object, the present invention employs the following technical means: a halftone dot or background of about 150 lines and about 10% is formed on the surface of the base plate. A background or latent image having an angle of 45 degrees or 90 degrees with respect to the vertical and horizontal directions of the base plate and having a cross-shaped line of about 50% and 10% corresponding to the latent image or background of the halftone dot is provided. An original film for copy prevention printing, characterized in that:

[0005]

[Function] If the latent image applied to the base plate is composed of halftone dots, the background is composed of cross-shaped lines, and if the latent image is composed of cross-shaped lines, the background is composed of halftone dots. The latent image and the background on the surface of the paper printed using the original are naturally cross-shaped lines if one is a halftone dot. Absent. A halftone dot of about 150 lines at about 10% is not reproduced when it is applied to a copying machine, so it becomes a white background or a light color.
Since the parallel lines of the degree are reproduced and become dark colors, there is a difference in shading between them, so that after copying, the latent image is clearly distinguished from the background.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 and 2, a base plate 1 as a plate making film has a latent image 3 indicated as "copy" consisting of halftone dots of 150 lines on a photosensitive film 2 on the surface. A background 4 consisting of a 50% line and 10% cross line having an angle of 45 degrees with respect to the vertical and horizontal directions of the base plate 1 is imprinted on a white portion other than the latent image 3. Although the cross-shaped line is at 45 degrees in the figure, it may be formed in a grid pattern at 90 degrees with respect to the vertical and horizontal directions of the base plate 1.

When printing is performed on a sheet using the original plate having the above-described configuration, a halftone dot latent image of 150 lines and 10% is formed on the surface of the sheet, and a cross-shaped line of 50 lines and 10% is formed on other portions. (Not shown). Therefore, when the printed matter is applied to a copying machine, halftone dots do not fly and are not reproduced as shown in FIG. 3, so that the latent image 3a has a white background shape, whereas the cross-shaped line is reproduced, so that the background 4a has a dark color. Latent image 3a
Is clearly recognized.

FIG. 4 is an enlarged view showing a state in which the intersections of the cross-shaped lines shown in FIG. 1 are in close contact, and FIG. 5 is an enlarged view showing a state in which the intersections are not in close contact. When the intersections are close as shown in FIG. 4, the reproducibility in the copy of the printed matter is somewhat stronger than when the intersections are not close, while when the intersections are not close as shown in FIG. In comparison, the print surface is somewhat lighter.

In the above embodiment, the latent image 3 is composed of halftone dots, and the background 4 is composed of cross-shaped lines.
May be composed of cross lines, and the background 4 may be composed of halftone dots.
It is a matter of course that providing the latent image 3 at a plurality of positions on the base plate 1 and forming the latent image into not only characters but also figures and various patterns belong to the free implementation range of the present invention.

[0010]

[Effects of the Invention] The present invention configured as described above has the following effects. (1) The countless squares formed by being surrounded by the cross-shaped lines are recognized by the naked eye as a set of fine point-like objects, and the printed matter is visually recognized as a smooth surface that is easy on the eyes. Therefore, unlike a line, the difference in shape from a halftone dot does not become extreme, so that it can be used for a wide range of printed matter without requiring a special linear pattern. (2) Since there is no need to perform overprinting for so-called cam flares, when a printed matter is copied, the difference in density between the latent image and the background is conspicuous, and the presence of the latent image is clearly recognized even when the density of the copying machine is adjusted. Therefore, it is clear that it is a copy. (3) When the intersections of the cross-shaped lines are brought close to each other, the reproducibility after copying is strong, and the contrast between the latent image and the background becomes clear. (4) If the intersections of the cross-shaped lines are not closely contacted as in claim 3, the surface of the printed matter is observed in a slightly lighter color than in the case where the intersections are closely contacted, and the distinction from the halftone dots becomes more indistinct. Cannot be identified, and the printed matter surface is uniformly and beautifully finished.

[Brief description of the drawings]

FIG. 1 is a plan view of a film original plate of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a plan view showing a copy of a printed material composed of the original film of the present invention.

FIG. 4 is an enlarged view showing a cross-shaped line in FIG. 1;

FIG. 5 is an enlarged view showing another embodiment of the cross-shaped line.

[Explanation of symbols]

 1 Basic Version 3 Latent Image 4 Background

Claims (3)

(57) [Scope of request for utility model registration] 1. A latent image or background consisting of halftone dots of about 150 lines and about 10% on a surface of a base plate, and a latent image or a background image of 45
Characterized in that a background or latent image having an angle of 90 degrees or 90 degrees and a cross-shaped line of about 50 lines and 10% corresponding to the halftone dot latent image or the background is provided. Original film. 2. A copy-preventive printing film precursor according to claim 1, wherein the cross-shaped lines are close at intersections. 3. The original film for copy-preventive printing according to claim 1, wherein the cross-shaped lines are not close at intersections.