JPH05309934A - How to identify intaglio prints - Google Patents

Abstract

(57) [Abstract] [Purpose] Identification method of intaglio printed matter using digital three-dimensional roughness measuring instrument [Configuration] Digital three-dimensional intaglio printing using a plate surface having finer characters or patterns inside the image line On the roughness measuring device, the portions of the same roughness are connected and displayed with the same color so that the latent image can be easily identified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a method of identifying intaglio printed matters including latent images such as banknotes, passports, securities and cards which are required to be forgery-proof and tamper-proof.

[0002]

2. Description of the Related Art It is required that banknotes, passports, securities, cards and the like are difficult to forge or falsify. As a countermeasure against these forgery and falsification, an intaglio printed matter containing a latent image in which an image consisting of finer characters or patterns is incorporated inside the image (Japanese Patent Application No. 1-187305 and Japanese Patent Application No. 1-187).
307). In order to confirm the latent image of these intaglio prints, the prints were tilted or enlarged using a microscope.

[0003]

In the method for identifying an intaglio printed matter using the forgery or tampering prevention method described in the prior art, for example, when the intaglio printed matter is viewed while tilted, the brightness, the direction of the light beam, the The latent image may not be seen well due to differences in eyesight. Also, when the latent image is so small that it cannot be identified with the naked eye, it is confirmed by enlarging it with a microscope or the like, but it is difficult to recognize the whole image at once because only a part is visible. An object of the present invention is to provide an identification method that is not affected by conditions such as an identification location and that allows the entire latent image to be viewed at once.

[0004]

In order to achieve the above object, the present invention uses a device for recording the roughness, waviness, scratches, etc. of a general processed surface electrically and three-dimensionally.
This device is a digital three-dimensional roughness measuring device that can display parts with the same roughness by connecting them with the same color. By performing color-coded display, the whole image of the latent image that is difficult to recognize by the normal method can be clearly displayed. Can be identified.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. In the image area of the color pattern 1 as shown in FIG. 1, the latent image 2 is formed with a character as shown in FIG. 2 at a depth of about 10 μm to 30 μm.
As a result, an intaglio plate surface was prepared. After printing using this plate surface and electron beam curable ink, the ink in the image lines on the plate surface is completely transferred to the printing paper by irradiating an electron beam from the back surface of the printing paper with the printing paper in close contact with the plate surface. Let

As shown in FIGS. 3 (a) and 3 (b), a printed matter 3 is obtained in which a convex latent image 2'consisting of characters is formed in the image line of the color pattern image line portion 1 '. This latent image 2'has less ink build-up as compared to the chromatic print image line portion 1 ', so the chromatic print image line portion 1'
Only ´ can be identified with the naked eye. This printed matter is digital 3
When the same roughness portions are connected and displayed in the same color by 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, banknotes, passports, etc. printed using a printing plate having a latent image in which an image line composed of finer characters or patterns is incorporated inside the image line, Preventing counterfeiting of securities, cards, etc.
For products that require tampering prevention and authenticity discrimination,
By using a digital three-dimensional roughness measuring device to connect and display parts of the same roughness in the same color, a latent image will appear due to the brightness of the location to be identified, the direction of the light beam, the difference in the visual acuity of the identifier, etc. There is no difference in the appearance of the image, and the latent image is so small that it cannot be discerned by the naked eye. Even if it was judged by enlarging a part of it with a microscope, the whole image can be seen at once. Now that you can do it, you can easily distinguish between true and false.

[0008]

[Brief description of drawings]

FIG. 1 is a diagram showing a color pattern used in an example.

FIG. 2 is a diagram showing an example of a character pattern used to be incorporated in a drawing line.

FIG. 3 is a schematic diagram of a shape of a printed material in which characters in a drawing line are convex.

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

[Explanation of symbols]

 1 saimon pattern 2 latent image 1'saimon image line part 2 'latent image 3 printed matter

Claims (1)

[Claims] 1. Intaglio printing using a printing plate having finer characters or patterns inside an image line, an intaglio printed matter for identifying the minute characters or patterns incorporated in the printed matter by a digital three-dimensional roughness measuring device. How to identify