JP3184891B2 - How to identify intaglio prints - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for identifying an intaglio printed matter containing a latent image, such as banknotes, passports, securities, cards, etc., for which forgery prevention and falsification prevention are required.

[0002]

2. Description of the Related Art Banknotes, passports, securities, cards and the like are required to be difficult to be forged or tampered with. As a countermeasure against such forgery or falsification, intaglio printed matter including a latent image in which an image composed of finer characters and patterns are incorporated inside the image (Japanese Patent Application Nos. 1-187305 and 1-187).
307). In order to check the latent images of these intaglio prints, the prints were tilted or viewed under magnification using a microscope or the like.

[0003]

In the method of identifying an intaglio printed material using the forgery or falsification prevention method described in the prior art, for example, when the intaglio printed material is viewed at an angle, the brightness, the direction of the light beam, The latent image may not be clearly visible due to differences in eyesight. If the latent image is too small to be identified by the naked eye because it is too small, it is necessary to magnify the image using a microscope or the like, but it is difficult to check the entire image at once because only a part is visible. SUMMARY OF THE INVENTION It is an object of the present invention to provide an identification method that is not affected by conditions such as a place to be identified and allows the entire latent image to be viewed at a time.

[0004]

In order to achieve the above object, according to the present invention, finer characters or patterns are placed inside an intaglio object.
Roughness of Intaglio Printed Material Printed by Intaglio Using a Plate with
In the identification method using a roughness measuring device, the roughness of printed surface is measured using a digital three-dimensional roughness measuring device that electrically expands and records the roughness, undulations, scratches, etc. of the general processed surface.
Consists of small characters or patterns embedded inside the print line
The three-dimensional image of the unevenness of the latent image is
By displaying in color, it is possible to reduce the size of small
Recognize the whole image of a latent image consisting of various characters or patterns, and
A method for identifying intaglio printed materials, characterized by identifying
To offer.

[0005]

Next, the present invention will be described with reference to the drawings. A character as shown in FIG. 2 is placed in a latent image 2 at a depth of about 10 μm to 30 μm on an image portion of the color pattern 1 as shown in FIG.
The intaglio stencil surface was prepared. After printing using this plate surface and electron beam-curable ink, the backside of the printing paper is irradiated with an electron beam while the printing paper is in close contact with the plate surface, and the ink in the image on the plate surface is completely transferred to the printing paper. I let it.

As shown in FIGS. 3 (a) and 3 (b), a printed matter 3 is obtained in which a convex latent image 2 'composed of characters is formed within the image of the colored image area 1'. Since the latent image 2 ′ has a smaller amount of ink than the colored pattern image 1 ′, the latent image 2 ′
Only 'can be identified with the naked eye. Digitally print this printed material
When a portion having the same roughness is connected and displayed with the same color using a dimensional roughness measuring device, a clear latent image 2 is obtained as shown in FIG.
'Is obtained.

[0007]

As described above, according to the identification method of the present invention, a banknote or a passport printed on a printing plate having a latent image in which an image composed of finer characters and patterns are incorporated inside an intaglio image. For products that require forgery prevention, falsification prevention and authenticity discrimination, such as securities, cards, etc., use a digital three-dimensional roughness measuring device to connect predetermined parts of the same roughness with the same color. If there is no difference in the appearance of the latent image due to differences in the brightness of the place to be identified, the direction of the light beam, the difference in the eyesight of the discriminator, etc.,
The latent image is so small that it cannot be identified with the naked eye, and what was judged by enlarging a part using a microscope, etc., can now be seen at once, making it easy to determine the authenticity. Now you can.

[0008]

[Brief description of the drawings]

FIG. 1 is a view showing a color pattern used in an embodiment.

FIG. 2 is a view showing an example of a character pattern used for incorporation into an image.

FIG. 3 is a schematic diagram of the shape of a printed matter in which characters in an image are convex.

FIG. 4 is a schematic diagram showing a latent image by a digital three-dimensional roughness measuring device of a printed matter in which characters in an image are convex.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Color pattern 2 Latent image 1 'Color image line part 2' Latent image 3 Printed matter

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) B41M 3/14 G07D ⁷ /00-7/20 G01B 21/30 B42D 15/10 531

Claims (1)

(57) [Claims] 1. The surface roughness of an intaglio printed matter obtained by intaglio printing using a printing plate having finer characters or patterns inside the intaglio image.
In the identification method using a measuring instrument, a part with the same roughness
The intaglio printed matter is displayed by performing color-coded display with a digital three-dimensional roughness measuring device that can display and display the minutes in the same color.
From embedded small characters or patterns within the intaglio streak
A special feature is to recognize the entire latent image and to identify the latent image.
Identification method of intaglio printed matter and symptoms.