JPS5838188A - Printed matter suitable for preventing forgery by duplicator - Google Patents

Abstract

PURPOSE:To enable latent images to be clearly distinguished after being duplicated but not before duplication by a method in which latent images and background are printed by using a high density ink of a hue reproducible by a duplicator and a light color ink of the same series hardly reproducible and then a cover print is applied on the surface of the latent images and background. CONSTITUTION:On the surface of a base paper 1, the latent image of the letter ''invalidity'' is blanked, and the other background portion 3 is printed by a fine constitutor using a thick gray ink, for example. For the latent images 2, printing is applied by a fine constitutor using a light gray ink. Furthermore, for between the fine constitutors in the background portion 3, printing is applied using the same ink as in the latent image, and then a cover print 4 consisting of a pattern composed of a combination of ground pattern and color patterns is applied on the surfaces of the latent image 2 and background portion 3. In such printings in this way, latent image appears clearly in white color when being duplicated, realizing it to be a duplicated one at a glance.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides printed matter suitable for preventing counterfeiting of securities and other important documents by color copying machines. .

In recent years, with the advancement of color copying machines, in order to prevent counterfeiting by copying securities, etc., the printed matter itself has been marked with "invalid" and "invalid," for example.
When you print a latent image such as copy j and run it on a copy machine,
A printed matter has been proposed in which an i* latent image character appears and it can be recognized at a glance that it is a copy. However, in the printed matter, the latent image and other background parts are formed by rough sketches of fine components such as halftone dots and background patterns.
They are distinguished by size, and the latent image and background appear uniform to the naked eye before they are put into a copying machine, but when they are put into a copying machine, they are distinguished and gased.

By the way, the disadvantage of printed matter that uses fine structure elements to distinguish the latent image from the background as described in 5 above is that if the latent image is made to appear clearly when it is run on a copying machine, it becomes blurry before it is run on the copying machine. However, the existence of a latent image is said to be mw5, and conversely, if both are made to appear uniformly to the naked eye, the latent image will not be clearly visible when placed on a copying machine. be.

Therefore, even if cam 7 large printing is performed on the upper surface of the image 11 and the background, the above-mentioned disadvantages will not essentially be resolved, and the difficulty of determining the coarseness and size of the fine components will not change. However, there are certain disadvantages such as not being valid for all documents.

In order to eliminate the above-mentioned conventional disadvantages, the present invention does not limit the latent image and the background to a combination of fine components, and furthermore, the latent image and the background are indistinguishable by oral administration before copying, and can be clearly distinguished only after copying. In other words, the latent image and other background parts are printed on the top surface of the base paper in the same color system using dark color ink that can be reproduced by a copying machine and light color ink that is difficult to reproduce. , a cover print is applied to the upper surface of the printed latent image and the background area, and if either the latent image using dark ink or the background area is formed with a fine structure element, the other is a fine structure element. It is designed so that it is not limited to the presence or absence of.

To explain the present invention with reference to an example, the latent image 2 of the character "invalid" is outlined in white on the surface of the base paper 10, and the other background part 3 is painted with dark gray ink using a 65-line screen, 15I
s, a halftone dot microstructure with a screen angle of 45°, and a 65-line screen 85g II, a halftone dot microstructure with a screen angle of 45", using a light gray ink in the submersible 112. A 65-line screen is printed between the fine elements in the background part 3.

The fine structure elements 15- are printed using the same ink as the latent image, and a cover print 4 consisting of a combination pattern of ground pattern and color pattern is applied with pale purple ink between the latent image 2 and the background area 3. It is something.

When the printed matter thus obtained is put into a copying machine and a copy is made,
The latent image 2 "invalid" appeared white (clearly).

Incidentally, if the discussion of the fine constituent elements and ink of the latent image 2 and the background portion 3 is reversed from the above embodiment, it goes without saying that the latent image 2 will appear pale in color.

According to the present invention, a background portion or a latent image is printed using a light-colored ink having a hue that can be reproduced by a copying machine, and the dark ink is a hue that can be uniformly observed.

If the latent image or background is printed using a light-colored ink with brightness and saturation, and a cover print is made on the upper surface of the latent image or background using an appropriate colored ink, the cover print can be used to create a conversation before copying, regardless of the above embodiment. The difference in ink is hidden and the latent image and background are uniformly observed when taken internally, and after copying, the latent image or background appears white and clear, making it easy to tell at a glance that it is a copy. Therefore, it has a remarkable effect in preventing counterfeiting of securities and the like by color printing machines.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a Senjizu before copying, FIG. 2 is a Senjizu after copying, and FIG. 3 is an enlarged vertical sectional view of the main part. 1 is the base paper, 2 is the latent image, and 3 is the background.

Claims (1)

[Claims] A background part or a latent image consisting of fine components is printed on the base paper using a dark ink that can be reproduced with a 1ifK copying machine, and a light color ink of the same color family that is observed almost uniformly with the naked eye is used. 1. A printed matter suitable for preventing forgery by a copying machine, characterized in that a latent image or a background part is printed, and a cover print is applied on the upper surface of the latent image or a background part using ink of a hue that is difficult to be reproduced by a copying machine.