JPS5938763A - Copying-proof original - Google Patents

Abstract

PURPOSE:To prevent plural kinds of copying differing in spectral characteristic, by forming a dot pattern arranged with a dot pattern provided with the absorption wavelength corresponding to the absorption wavelength of a copying machine and a dot pattern differing in the peak of the absorption wavelength therefrom on an original surface. CONSTITUTION:Dots 4 are gravure-printed on the surface of a transparent film 3 having the same area as the area of an original, and a pressure-sensitive adhesive agent 5 is coated on the rear of the film 3. The rear of the film 3 is adhered on release paper 6. The dots 4 consist of dots having different wavelengths, for example, 3 colors, which dots are arranged in a pattern. The film is released from the paper 6 and is adhered on the surface of the original in tight contact therewith. If such copying-proof original is copied with an electrophotographic copying machine having a specific spectral characteristic, only the specific dots are developed and are superposed on the image on the original.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copy prevention ratio of 111 koku that is applied to confidential documents and the like.

2. Description of the Related Art In recent years, various types of copying machines have become widespread, and it is now possible to copy confidential documents and the like with relative ease.

For this reason, various techniques have been proposed to prevent the copying of confidential documents, etc., but the basic idea is to select the color tone of the original according to the spectral characteristics of the copying machine, and to The goal is to equalize the reflectance characteristics with the image area and make image reproduction impossible.

To achieve this, for a copying machine with spectral characteristics that peak at a specific wavelength, the color tone of the non-image area of the original must be selected to match or be close to the specific wavelength. If a black image is drawn on the same original, both the non-image area and the image area of the original will be developed, resulting in a solid black copy, making it difficult to distinguish the image area, and the purpose of preventing copying will not be achieved. Ru.

However, when an original with the above-mentioned color tone is copied using another copying machine with different C characteristics, the non-image area of the specific color tone is not developed, but only the black image area is developed, and the image area cannot be identified. became +iJ function, and copying could not be prevented.

In this way, if the non-image area of the original is colored in a specific tone, copying can be prevented by copying machines with corresponding spectral characteristics; however, copying can be prevented by copying machines with other spectral characteristics. Images that require secrecy end up being copied.

The present invention relates to an improvement of a copy-protected original that overcomes these difficulties, and its purpose is to provide an original that can be prevented from being copied by any of a plurality of types of copying machines having different spectral characteristics.

An embodiment of the present invention illustrated in FIGS. 1 to 5 will be described below.

1 is a document on which image 2 has been drawn in black with a pencil or the like.

Further, as shown in FIG. 1, on the surface of a transparent polyester film 30 having the same area as the original 1 and a thickness of 75 μm, there are spots 4 of 0.5 to 1.0 mm in size. 5+
Gravure printing is carried out at intervals of 30 nm.
An adhesive 5 is applied to the surface of the river, and the back side of the film 3 is adhered to a release paper 6.

Therefore, the spot 4 is 645 hm1572 nm1
3 color spots with wavelength of 448run 4 a % 4 b
-, 4c, and the same spots 4a%4b) 4c are arranged in a pattern as shown in FIG.

If the polyester film 3 on which the spots 4 a 14 b % 4 c are printed is peeled off from the release paper 6 and attached to the surface of the document 10, the polyester film 3
The polyester film 3 is closely adhered to the surface VC of the document 10 by the adhesive 5 applied to the back surface of the original.

When copying the thus formed anti-copy manuscript using a solo electrophotographic copying machine A whose emission line spectrum has a wavelength of 390 to 510 nm, the spots 4as4b with wavelengths different from this wavelength are not developed and become plain. Or similar to this, spots 4 within the range of 390 to 510 nm
c is developed and overlaps with the image 2 on the document 1, so that the shape of the image 2 becomes unclear due to the spots 4C, and the desired purpose is achieved.

In addition, the anti-copy original 41°14 shown in Figures 1 to 5
When the image is copied by an electrophotographic copying machine B having a spectral characteristic in which the wavelength of the bright line spectrum is 410 to 560 nm, copying is also prevented in the same manner as described above.

The wavelength of the emission line spectrum is 420 to 6.
When copying with an electrophotographic copying machine C having a molecular C characteristic of 20 nm, only the spots 4a with a wavelength different from this wavelength are not developed and become a plain color or a state close to this, but 420 to 62
Spots 4b and 4c within a range of 0 nm are developed, and compared to the previous case, spots 4 overlapping image 2 on document 1 are
The numbers of b and 4a further increase, and the shape of the image 2 becomes even more unclear.

The wavelength of the emission line spectrum is 480 to 690 nm.
The original document'? i
:'61 When copying, only the spots 4c are not developed and become a plain color or a state close to this, but the spots 4a% 4b within the range of 480 to 690 nm are developed and copying is also prevented.

Moreover, the wavelength of the emission line spectrum is 405 to 550.37.
Two types of copying machines E2F with spectral characteristics ranging from 0 to 500 nm
When each of the originals is copied, the shape of the image 2 becomes unclear due to the spots 4C, similar to when copies are made using the first and second copying machines.

Also, the arrangement of the spots 4a, 4b, 4c'? i: It may be changed as shown in FIG. 6 or FIG. 7, and substantially the same effect as the above embodiment can be obtained.

In the above example, three colored spots 4 a % 4 b N
4c The printed polyester film 3 was adhered to the original 1, but it may also be printed with two-color spots as shown below.

That is, on the surface of a transparent polyester film 30 having a thickness of 50 μm, spots 7a and 7b of two colors with wavelengths of 654 nm and 1462 nm are arranged as shown in FIG. 8 and have the same size and spacing as described above. Gravure printing is performed to form a copy-protected document in the same manner as in the embodiment shown in FIGS. 1 to 5.

In this embodiment as well, copying is prevented using the same principle as in the embodiments shown in FIGS. 1 to 5.

On the other hand, a red dye and a blank dye are mixed to make a mixture whose reflection wavelength peaks at 678 nm, and this is mixed with starch to make a 10% aqueous solution and applied to the surface of high-quality paper to produce a red dye. Manuscript paper with a dark tone? create. If a black image is drawn on this manuscript paper and it is copied using a copying machine that has spectral characteristics in which the wavelength of the bright line spectrum is 480 to 690 nm, a solid black copy will be obtained and copying will be prevented. Wavelength is 420-6
When a copy is made using a copying machine C having a molecular C characteristic of 20 nm, a nearly solid black copy is obtained, making it difficult to identify the image on the original.

This can be expressed in a table as shown below.

Furthermore, the arrangement of the two-color spots 7as7b may be changed as shown in FIG. 9 or FIG.

Furthermore, the number of types of spots may be four or more, and the arrangement of spots may be irregular instead of regular.This makes it more difficult to read the manuscript, but is more effective in preventing copying. There is.

In the present invention, at least one speckled pattern with an absorption wavelength corresponding to the absorption wavelength of a copying machine, at least one other speckled pattern with a different absorption wavelength peak from this pattern, and two regular or irregular speckled patterns are provided. Because the same speckled pattern was formed on the document surface in a state where they were arranged in a
Even for copying machines with absorption wavelengths different from this, if one of the various types of speckled patterns is copied overlapping the image on the document surface, this copied speckled pattern will cause the original +i:4 The image on the blood becomes unreadable and the intended purpose is achieved.

[Brief explanation of the drawing]

FIG. 1 shows spots used in an embodiment of a copy-preventing manuscript according to the present invention, which are printed on a release paper and attached to the γ? 2 is a perspective view illustrating the state in which the film is attached to a document, FIG. 3 is a perspective view of the embodiment after the film has been attached, and FIG. A cross-sectional side view, FIG. 5 is an enlarged plan view illustrating the arrangement of the three colored spots in the above embodiment, FIGS. 6 and 7 are enlarged plan views showing other arrangement states of the three colored spots, Sentence 8 to Figure 1O are enlarged ゛+i views showing the arrangement of spots of two colors, respectively. DESCRIPTION OF SYMBOLS 1... Manuscript, 2... Image, 3... Polyester film, 4... Spots, 5... Adhesive, 6... Release paper, 7... Spots. Agent Patent Attorney Nozomi Ehara 1 other person 1 figure 2 figure 3 figure 5 figure 5 C 4a-@o'■■ 4b〜■■■■ ■■■◎ ■◎■■ ■■■ ■ 40～■■■■ 40～■■■◎◎4b～■■◎
■■ 4C~@■■■■4c~O■■■To O4b■
■◎■■ ■■■■■ ■■■■■ ■■■■■ ■■■◎の范8Figure 7o-■■■ 7b-J■■＠ ■■■■ ■■■■ 70-1 ■■■ To 7q■■■■7b-@
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Claims (1)

[Claims] At least one speckled pattern having an absorption wavelength corresponding to the absorption wavelength of a copying machine and at least one other speckled pattern having a different absorption wavelength peak from this are arranged regularly or irregularly. A type of protection 1° characterized by forming the same speckled pattern on the entire document surface.