JP2838631B2 - Non-copyable form - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-copyable form in which, when a document is copied by a copying machine, a secret portion becomes black and cannot be read.

[0002]

2. Description of the Related Art In order to prevent leakage of confidential information, when a document is copied by a copying machine, a confidential portion becomes black and becomes illegible, and a non-copyable form which prevents information from being spread is: JP-A-59-114566 and Japanese Patent Publication No.
No. 54706.

The former configuration is a form in which a copy protection area is printed in a sepia color and has a reflectance of 10% or less in a wavelength range of 600 nm or less. When this is copied, the portion of the print layer becomes black, and the information printed on this print layer becomes unreadable.

[0004] The latter configuration is a form in which a solid print layer and a pattern print layer are overprinted on the front surface of the base and a solid print layer is formed on the back surface.

[0005]

In the above-mentioned conventional configuration, in the configuration of Japanese Patent Application Laid-Open No. Sho 59-114566, the entire form has a reflectance of 10% or less. There is a problem that the contents are difficult to read.

The configuration of Japanese Patent Publication No. 1-54706 has a problem that printing is difficult because the reflection density is specified, and that both sides must be printed a plurality of times, which is expensive.

An object of the present invention is to eliminate the problems of the conventional configuration.

[0008]

According to the present invention, the reflectance is low in a wavelength region of 500 nm to 600 nm in the visible region,
Wavelength regions at both ends of the visible region (400 to 500 nm, 600
７００700 nm), the reflectance is high in all or some regions,
It is characterized by having a printing layer using a color of sepia system, purple system, indigo system or the like, and forming a spot pattern such as a tint block by shading of the color, and characters are printed on the printing layer. This is a form that cannot be copied.

[0009]

The printed layer of the form does not make the whole dark, but has a patchy pale portion. Therefore, the reflectance is 10%.
The above reflectance can be ensured, and the printed content is easier to read than the configuration of JP-A-59-114566. This spot pattern is formed by a method such as overlapping a tint with a tint block.

The principle of making it impossible to copy the printing layer will be described.

The purple system (a), the sepia system (b),
The indigo line (c) is, as shown in FIG.
The reflectance is low in the wavelength region of 0 nm, and 50% in the purple system.
The reflectance increases at 0 nm or less and 600 nm or more. In the sepia system, the reflectance increases at 600 nm or more.
Further, in the indigo system, the reflectance increases below 500 nm.
Here, the wavelength of the color light is expressed in a unit of nanometer (nm) of 1/100 of 1 nm, the visible region is 400 to 700 nm, those with low reflectance are black, and those with high reflectance are black. It becomes white.

On the other hand, as shown in the characteristic diagram of FIG. 5, the sensitivity of the copying machine is generally good at around 550 nm. For example, a color having a high reflectance in a wavelength range of 550 nm, such as yellow, is solid-printed and copied. Then, the printout is not copied due to dropout. Conversely, the wavelength ranges at both ends of the visible region (4
(500-500 nm, 600-700 nm)), the sensitivity of the photosensitive drum of the copying machine is not very good, and the color reflected in the wavelength regions at both ends is perceived as black by the copying machine. That is, in the visible region of 400 to 700 nm, 500 n
m to 600 nm, the reflectance is low, and the wavelength range at both ends (400
-500 nm, 600-700 nm) with high reflectance
When the print layer is formed using
And the copying machine has low sensitivity, the copying result
Black color.

Therefore, due to such characteristics , it is necessary to keep confidential on the purple, sepia and indigo printing layers.
When characters are printed, if this is copied with a copier,
The printing layer has low sensitivity in a region of high reflectance shown at 500 nm or less and 600 nm or more, and the portion corresponding to the printing layer of the copied form as a whole becomes dark. this
As a result, it is difficult to determine that the secret character is black. At this time, due to the shading of the spot pattern such as the tint block, the light part becomes slightly lighter black than the dark part, but the dark spot pattern overlaps the character, and even if there is a light part, camouflage will be applied , Characters cannot be read. In addition, confidential
In the original with the terms printed,
The reflectance is improved, and characters can be easily read.
Wear.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

FIGS. 1 and 2 show a non-copyable form 1 according to the present invention.
The print layer 2 is printed in the copy protection area of the non-copyable form 1. This printing layer 2 has a thickness of 500 nm to 6 nm.
A spot pattern, such as a tint block or the like, formed of colors such as a purple system, a sepia system, and an indigo system having a low reflectance in a wavelength range of 00 nm and formed by randomly superimposing numbers and the like as shown in an enlarged manner in FIG. Are shaded. This is 50 ~
It is formed by printing with a halftone dot of 80% as a background, and further printing the copy-forgery-inhibited pattern in the same color. In addition, it is also possible to print one plate.

The printing layer 2 has a thickness of 500 in the purple system.
The reflectivity increases below nm and above 600 nm. In the sepia system, the reflectance increases at 600 nm or more. Further, in the indigo system, the reflectance increases below 500 nm. For this reason, as shown in FIG.
At the wavelengths of 00 nm and 600 to 700 nm, the sensitivity of the photosensitive drum of the copying machine is poor, and the color reflected in the wavelength region at both ends has little effect on the sensitivity of the copying machine. The rate is low and the color is black.

For this reason, when printing is performed on the printing layer 2 by a printer, the black printing characters and the characters can be distinguished from the printing layer 2 by the difference in the color tone due to each color, and a light portion is generated by the spotted pattern 3. As a result, the required reflectance is ensured, and the printed characters can be easily read. On the other hand, when the image printed on the printing layer 2 is copied by a copying machine, as described above, the portion of the printing layer 2 becomes black and the characters cannot be read. At this time, due to the mottle pattern 3, the light portion is slightly lighter black than the dark portion, but the dark mottle pattern overlaps the character and is camouflaged, and even if there is a light portion, Characters cannot be read.

[0018]

According to the present invention, as described above, 500 nm
Low purple line reflectance in the wavelength region of ～600Nm, sepia system consists colors such as indigo system, to form a printed layer 2 of shading of mottling is attached a background pattern, such as confidential contents to the print layer < Because of this, the lightness of the mottled pattern 3 improves the reflectance, makes the characters easier to read, and the print layer 2 needs to be formed on only one surface. In addition, printing is simple, and in a copied state, there is an excellent effect that the printed layer 2 becomes dark and the confidential contents cannot be read, and the confidentiality can be sufficiently achieved.

[Brief description of the drawings]

FIG. 1 is a plan view of a form 1 that cannot be copied according to the present invention.

FIG. 2 is a vertical sectional side view of a non-copyable form 1;

FIG. 3 is an enlarged view of a printing layer 2.

FIG. 4 is a graph showing the relationship between each wavelength and reflectance of a purple system (a), a sepia system (b), and an indigo system (c).

FIG. 5 is a characteristic diagram showing a relationship between wavelength and sensitivity of a copying machine.

[Explanation of symbols]

 1 Non-copyable form 2 Print layer 3 Spotted pattern

Claims (1)

(57) [Claims] 1. A laser device comprising: 500 nm to 600 n in a visible region.
m, the reflectance is low in the wavelength range of m, and all of the wavelength ranges (400 to 500 nm, 600 to 700 nm) at both ends of the visible range,
Alternatively, using a color such as a sepia system, a purple system, or an indigo system, which has a high reflectance in a partial area, and having a printing layer formed by forming a spot pattern such as a tint block by shading the color, A non-copyable form, wherein characters are printed.