JPH0644713Y2 - Information hiding copy slip - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an information concealment type copy slip in which information such as characters and symbols copied on a leaflet is not readable by anyone other than a specific person.

<Prior Art> As a means for preventing the secret leakage of information such as a secret code copied on a storage slip of a bank or the like, there has been proposed a technology of irradiating information with ultraviolet light of a specific wavelength (for example, See Japanese Utility Model Publication 58-196160 and Japanese Utility Model Publication 60-18946).

Of these, the former technique is to provide a carbon layer containing a fluorescent substance that emits a certain short-wavelength ultraviolet light on the back surface of the upper leaf paper, and to form the carbon layer on the surface of the lower leaf paper corresponding to the carbon layer. Is a random pattern printing layer of the same color as the above, and the latter technique, on the back surface of the upper paper, a carbon layer containing a fluorescent substance that emits a certain short-wavelength ultraviolet light is provided, A layer of concealing printing is provided on the surface of the lower leaf paper corresponding to the layer and an irregular embossing pattern is provided, and in each case, the carbon layer of the upper leaf paper is the printing layer on the surface of the lower leaf paper on which information is copied. Since a print layer of the same color is provided, the secret code or the like cannot be visually recognized with the naked eye and the reading can be performed only when the ultraviolet light is irradiated.

<Problems to be solved by the invention> That is, in any of the above-mentioned conventional techniques, it is difficult to read information from the front surface of the lower leaf paper, but the writing pressure applied to the upper surface is inevitable on the back surface of the lower leaf paper. However, even if the embossing is provided, the embossed pattern is destroyed by the writing pressure, so that it is possible to read from the back surface of the lower leaf paper. In addition, embossing has a problem in that it is troublesome to process, the cost is high, and the appearance is bad.

The present invention has been made in view of the above problems of the prior art. The purpose of the present invention is that it is difficult to read information not only from the front surface of the lower leaflet but also from the back surface thereof, and is suitable for preventing the leakage of secrets. It is expected to provide information hiding copy slips.

<Means for Solving the Problem> In order to achieve the above object, the present invention employs the following technical means, that is, 250
In a voucher in which a carbon layer containing a fluorescent substance that emits short wavelength ultraviolet light of about nanometer is provided, and a pattern printing layer of the same color as the carbon layer is provided on the surface of the lower leaf paper corresponding to the carbon layer, This is an information-concealing copy voucher in which a bottom layer of a lower sheet of paper corresponding to a pattern printing layer is provided with a concealing ink concealing layer consisting of about 30% halftone dots and dazzling lines such as diagonal lines, curves, and dotted lines.

<Operation> When information is written with a ball-point pen such as a secret code on the front surface of the upper paper, the information is copied from the carbon layer on the back surface to the pattern printing layer. Since the color of the carbon layer and the color of the pattern printing layer are the same, the information cannot be read with the naked eye, but since the carbon layer contains a fluorescent substance, the transferred information is short wavelength ultraviolet light of about 250 nm. When illuminated with, it emits a fluorescent color tone and can therefore be read.

Information is projected on the back surface of the lower leaf paper by the writing pressure of the ballpoint pen written on the lower leaf paper from the upper leaf paper, but since there is a concealment layer consisting of halftone dots and dazzling lines on the back surface, the information is It will not be read from the lower surface of the lower leaf due to interference with the hiding layer.

<Example 1> 1 is an upper leaf paper provided with a green carbon layer 2 on the back surface, the carbon layer containing a fluorescent substance that emits light only when irradiated with ultraviolet rays having a short wavelength of around 250 nanometers. ing. 3 is a lower leaf paper for storage, which is provided with a pattern printing layer 4 formed by combining vertical and horizontal lines and curves on the surface corresponding to the carbon layer. This pattern printing layer has the same color as the carbon layer 2. Therefore, even if the information M written on the upper leaf paper is transferred from the carbon layer 2, it is invisible to the naked eye, and the fluorescent substance does not react even if a commercially available germicidal lamp or plaque light is used. M is not visible. Reference numeral 5 is a concealing layer made of black corner ink provided on the back surface of the lower paper 3 corresponding to the pattern printing layer 4 on the front surface.
Consists of a dazzle line that is a combination of halftone dots and diagonal and dotted lines,
Even if the information M copied on the pattern printing layer 4 projects to the back surface of the lower leaf paper by the writing pressure, the information cannot be read because the hiding layer 5 interferes.

<Effects of the Invention> The present invention has the following unique effects.

(1) The information copied on the pattern printing layer cannot be read by the naked eye as a matter of course with ordinary colored filters, etc., so it is possible to keep the secret during storage, and even if the slip leaks out, obtain it. There is no danger of leaking secrets because it is impossible to read unless a short-wave ultraviolet irradiation device is used.

(2) Even if information is projected on the back surface of the lower leaf paper by the writing pressure, the hiding layer interferes with each other, so that there is no possibility of reading the information from the back side.

(3) Unlike the conventional embossing, the concealing layer is easy to process because it uses an ordinary printing means and can be obtained at a low cost.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is a sectional view, FIG. 2 is a sectional view of a lower leaf paper on which information is written, and FIG. 3 is a plan view of a lower leaf paper on which information is copied, FIG. 4 is a plan view of the same as above in which ultraviolet light is emitted to cause the fluorescent substance to emit light, and FIG. 5 is a main part plan view showing the back side of the lower leaf paper. 1 ... Top paper, 2 ... Carbon layer, 3 ... Bottom paper, 4 ...
… Pattern printing layer 5 …… Hiding layer.

Claims (1)

[Scope of utility model registration request] 1. A carbon layer containing a fluorescent substance that emits short-wavelength ultraviolet light of about 250 nanometers is provided on the back surface of the upper leaf paper, and a carbon layer is formed on the surface of the lower leaf paper corresponding to the carbon layer. In a voucher with a pattern-printed layer of the same color, a hidden ink-concealing layer consisting of about 30% halftone dots and dazzling lines such as diagonal lines, curves, and dotted lines is provided on the back side of the bottom paper corresponding to the pattern printed layer An information-concealed copy slip provided.