JPH0458033B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to rendering documents or records resistant to copying, i.e., unable to be copied, and more particularly to a highly novel and useful non-copyable paper. I will provide a.

With the ready availability of copying machines today, the problem has arisen of how to make documents, or portions of documents, resistant to copying, ie, rendered uncopiable. If a document carrying confidential information is not copy-resistant, that is, if it is easy to copy, it has now become unduly easy for anyone to make an unauthorized copy of that document. . There have been various attempts in the past to make documents resistant to copying by covering the information on the document with transparent films that make the information visible to the human eye but prevent adequate copies from being made. It has been done. U.S. Patent No. 3887742 and
No. 4118122 discloses a proposal of this kind. However, for one reason or another, neither of these proposals provides a satisfactory solution to the problem of making documents resistant to copying.

It is an object of the invention to provide improved means for making documents or parts of documents resistant to copying.

According to the invention, a document or a portion of a document has approximately
Approximately 10% less for light with a wavelength shorter than 600 mμ, approximately 10% for light with a wavelength longer than 650 mμ
% and has a visual contrast with the information on the document that is sufficient to enable the human eye to read the information when the document is viewed under white light. and has a color consisting of a mixture of red and blue.

It has been found that documents according to the invention are sufficiently resistant to copying by most currently available copying machines, while at the same time allowing the information to be read by the human eye.

Preferably, the color has a reflection spectral response of less than about 10% to light having a wavelength shorter than about 620 mμ, and the color has a reflection spectral response of about 5% blue, about 57% white, about 32% red, and about 4% black. % or a mixture consisting of about 9% Blue and about 9% Red
It is a mixture consisting of 84% black and about 6% black,
Alternatively, the color has a reflectance spectral response of less than about 10% to light having wavelengths shorter than about 650 mμ, and the color is a mixture of Example 1 or a mixture of Example 2 below.

The color may be applied by applying ink of such color over at least a portion of the document or by applying such color to the document during manufacture. This aspect of the invention is particularly useful because it provides non-copyable paper, i.e., paper on which information can be printed or otherwise coated and which cannot be copied by most copying machines available today. is important.

Alternatively, the color can be applied over at least a portion of the document by covering it with a transparent film of that color, preferably by fixing the transparent film with adhesive.

The transparent film can include multiple superimposed layers. This transparent film is approximately 600mμ
a first red layer having a transmission spectral response of less than about 10% at wavelengths of about 650 mμ and increasing to about 75% at wavelengths of about 650 mμ;
a second red or blue layer having a transmission spectral response of about 50% for wavelengths of less than about 650 mμ, and the first and second layers have a reflection spectrum of less than about 10% for light having wavelengths shorter than about 650 mμ. It is convenient to give a response.

The color preferably also has a reflection spectral response of approximately zero to light having wavelengths shorter than about 620 mμ.

Embodiments of the invention will be explained by way of example with reference to the drawings.

Referring first to FIG. 1, a white coated paper substrate with a matte or glossy surface has a layer of printed ink on at least one side, the color and thickness of the ink being as shown in FIG. Such as to provide a reflection or return spectral response or characteristic for normally incident light as indicated by line F.
This reflection spectral response is approximately zero for light with wavelengths less than about 620 mμ and less than about 10% for light with wavelengths less than about 650 mμ.

The standard spectral response for the human eye is shown by line E in FIG. 1, and the typical spectral response of known copiers is shown by line PC. The spectral response of this copier decreases to zero at a wavelength of approximately 610 mμ. In fact, "cut-off" (i.e., cut-off, decoupling) is a term commonly applied to wavelengths at which the spectral response drops to about 10%; It turns out that the wavelength is about 600 mμ. Thus, the copier cannot copy information carried by paper (usually black) because it cannot distinguish between the information and the color of the paper.
However, enough light with a wavelength of approximately 620 mμ to 700 mμ is reflected by the paper so that the information can be read by the human eye when viewing the document under white light.

Three examples of inks that can be used to provide the type of reflection spectral response shown by line F in FIG. 1 are as follows. That is, Example 1 “Process Blue” 4.6% “Reflex Blue” 1.0% “Transparent White” 46.4% “Opaque White” 11.3% “Warm Red” ”) 20.4% “Rubine Red” 12.3% “Black” 4.1% Example 2 “Process Blue” 7.5% “Reflex Blue” 1.5% “Warm Red” ) 38.9% “Rubine Red” 45.3% “Process Black” 6.8% Example 3 Different mixtures of: “Rodominium Red” “Rubine Red” ) "Black" According to another embodiment of the invention, the paper is prepared according to line F in FIG. 1 during the manufacture of the paper, for example by impregnating the original paper pulp with a suitable ink. has a reflection spectral response of the type shown below. The inks detailed in Example 1 can be used for this purpose.

Thus, the original document, which usually consists of black typed or underlined information on white paper, but which can also consist of any other coloring combination, can be used in either of the two embodiments previously described. can be copied on paper. Although the information on such a copy is readable by the human eye, any attempt to further copy that copy will not succeed because the information is prevented from being copied for unauthorized copies. .

The two previously described embodiments therefore provide a highly novel and useful non-copyable paper onto which secret information can initially be loaded, for example by typing. , or on this non-copyable paper, such confidential information can be copied from an ordinary original white document carrying the information in a conventional manner. In this latter case, the non-copyable paper according to the invention replaces the paper normally used in copiers.

According to another embodiment of the invention, the information-bearing paper is provided with a transparent colored film which provides the paper or relevant parts of the paper with a reflection spectral response of a type similar to line F in FIG. Pasting can make it resistant to copying. This film can be permanently affixed to the paper, for example by adhesive, if desired.

For example, a transparent film having light transmission spectral characteristics of the type shown by line R ₀ in FIG. 2 can be used. Such a film may be an acetate film known as Pantone ruby red (Pantone is a trade name of the Letraset company). Preferably,
A layer of two such films is used. Such two layers provide light transmission properties of the type shown by line RR in FIG. 2, ie, light transmission properties that have a sharp "cut-off" at wavelengths longer than a single film _R0 . The reflection spectral response of such a two-layer film is shown by line (RR) ² in Figure 3, which also shows the spectral response of the human eye by line E and by line PC. It therefore shows the spectral response of a known copying machine. The spectral response of this two-layer film has a "cut-off" at about 615 m.mu. and approaches zero at about 605 m.mu., with negligible overlap with the copier response. However, the human eye can read information on documents without difficulty.

In order to further prevent copying, 600 mμ
A second transparent film having a transmission spectrum characteristic of about 50% in the range of ~700 mμ can be used. A preferred film is a Pantone film having a transmission spectral characteristic shown by line B ₀ in FIG.
It is a blue film sold under the trade name 297-A. This blue film B ₀ is pasted on a piece of paper, and a ruby red film R ₀ is pasted on top of this blue film B ₀ to give a combined transmission characteristic as shown by the line RB in FIG. The reflection spectral response of such a composite film is
Indicated by line (RB) ² in the figure. This composite film RB "cut-off" is a composite film
It can be seen that it is at a higher wavelength of 635 mμ compared to the wavelength of 615 mμ for RR "cut-off".

According to a further embodiment, it is advantageous if the paper is translucent, even more advantageous if it is transparent. Suitable papers include, for example, Kimberley-Clark under the trade name UV Ultra II.
This paper is sold by Clark.

Accordingly, the present invention also provides non-copyable inks having a reflection spectral response of less than about 10% to light having wavelengths less than about 600 mμ, preferably less than about 620 mμ, and even more preferably less than about 650 mμ.

The invention is of course applicable to any confidential document including lottery tickets, show and sports tickets, postage stamps and revenue stamps, stock certificates and contract certificates, credit cards, personal and bank checks, traveller's checks and bank drafts (or banknotes). can do.

Other embodiments and embodiments of the invention will be readily apparent to those skilled in the art.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the reflection spectral response of a non-copyable paper according to one embodiment of the present invention, and FIG. 2 is a diagram showing the transmission spectral response of a transparent film layer used in another embodiment of the invention. and FIG. 3 is a diagram showing the reflection spectral response of white paper coated with various transparent film layers.

Claims (1)

[Claims] 1. In a document carrying information in which at least a part of the information is located in a part of the document, the claim for light having a wavelength shorter than 600 mμ is smaller than 10% and for light having a wavelength longer than 650 mμ. Ten%
has a substantially greater reflectance spectral response;
and has sufficient visual contrast with the information to enable the human eye to read the information when the document is viewed under white light, and has a color that is a mixture of red and blue. A document containing information that is characterized by 2 For light whose color has a wavelength shorter than 620 mμ
has a reflectance spectral response less than 10%, and the colors are blue 5%, white 57% and red 32
% and 4% black, or a mixture consisting of 9% blue, 84% red and 6% black. 3 For light whose color has a wavelength shorter than 650 mμ
has a reflectance spectral response of less than 10%, and the color is a mixture consisting of Process Blue 4.6% Reflective Blue 1.0% Transparent White 46.4% Opaque White 11.3% Warm Red 20.4% Rubin Red 12.3% Black 4.1%; or The document according to claim 1, which is a mixture consisting of 7.5% blue, 1.5% reflex blue, 38.9% warm red, 45.3% rubin red, and 6.8% process black. 4. A document according to claim 1, in which the color has a nearly zero reflection spectral response to light having a wavelength shorter than 620 mμ. 5. A document according to claim 1, wherein the document comprises a paper substrate with ink of the color applied over a portion of the document. 6. The document according to claim 5, in which the paper is white and the information is black. 7. The document consists of paper that has been colored during manufacture to impart color to parts of said document, said color being of the following composition: Process Blue 4.6% Reflex Blue 1.0% Transparent White 46.4% Opaque White 11.3% Warm Red 20.4% Rubin Red 12.3% Black 4.1% or the following composition: Process Blue 7.5% Reflex Blue 1.5% Warm Red 38.9% Rubin Red 45.3% Process Black 6.8% documents. 8. The document set forth in claim 7 in which the information is in black. 9. The document according to claim 1, wherein the document is made of a paper substrate on which information is placed, and the transparent film of the color is fixed to the substrate over a portion of the document. 10. The document according to claim 9, wherein the transparent film comprises a plurality of overlapping layers. 11 Transparent film at a wavelength of 600 mμ
a first red layer having a transmission spectral response of less than 10% and increasing up to 75% at wavelengths of 650 mμ, and a second red or blue layer having a transmission spectral response of 50% for wavelengths between 600 and 700 μ. The first layer and the second layer have a thickness of 600 mμ.
Claim 10 provides a reflection spectral response less than 10% for light having a shorter wavelength
Documents listed in section. 12. The document according to claim 9, wherein the paper is white and the information is black. 13. In making a document carrying information resistant to copying, the portion of the document carrying at least part of the information must be protected against light having a wavelength shorter than 600 mμ by 10%.
For light with smaller wavelengths longer than 650 mμ
has a reflectance spectral response substantially greater than 10% and has sufficient visual contrast with the information to enable the human eye to read the information when the document is viewed under white light. A method of making a document containing information resist copying by applying a color that is a mixture of red and blue. 14. A color has a reflection spectral response of less than 10% to light with a wavelength shorter than 620 mμ, and said color has 5% blue and 57% white.
14. The method of claim 13, wherein the mixture is a mixture of 32% red and 4% black or a mixture of 9% blue, 84% red and 6% black. 15 A color has a reflection spectral response of less than 10% to light with a wavelength shorter than 650 mμ, and the color is Process Blue 4.6% Reflex Blue 1.0% Transparent White 46.4% Opaque White 11.3% Warm Red 20.4% Rubin Red 12.3% 14. The method according to claim 13, wherein the mixture is a mixture consisting of 4.1% Black, or 7.5% Process Blue, 1.5% Reflex Blue, 38.9% Warm Red, 45.3% Rubin Red, and 6.8% Process Black. 16 The reflection spectrum response of the color is 620 mμ
14. The method of claim 13, wherein the value is approximately zero for light having shorter wavelengths. 17. A method according to claim 13, wherein the color is applied to a portion of the document by applying ink of the color over the portion of the document. 18. The method of claim 17. 19. The method of claim 13, wherein the coloring is applied to a portion of the document during paper manufacturing. 20. The method according to claim 19, wherein the information is black. 21. The method according to claim 13, wherein the color is applied to a portion of the document by covering the portion of the document with a transparent film exhibiting the color. 22. The method according to claim 21, wherein the colored transparent film is adhered to a paper substrate over a portion of the document. 23. The method of claim 21, wherein the transparent film comprises a plurality of overlapping layers. 24 Transparent film at a wavelength of 600 mμ
a first red layer having a transmission spectral response of less than 10% and increasing to 75% at wavelengths of 650 mμ, and a second red or blue layer having a transmission spectral response of 50% for wavelengths between 600 and 700 mμ. The first layer and the second layer are 600m long.
Claim 2 provides a reflection spectral response of less than 10% for light with a wavelength shorter than μ.
The method described in Section 3. 25 For non-copyable paper, less than 10% for light with a wavelength shorter than 600 mμ and 10% for light with a wavelength longer than 650 mμ
has a substantially greater reflectance spectral response;
and if the information is typed or otherwise applied, the information is sufficient to enable the human eye to read the information when viewing the non-copyable paper under white light. Non-copyable paper, characterized in that it has a color that visually contrasts with the information and is a mixture of red and blue. 26 A color has a reflection spectral response of less than 10% to light with a wavelength shorter than 620 mμ, and said color has 5% blue and 57% white.
A non-copyable paper according to claim 25, which is a mixture of 32% red and 4% black, or a mixture of 9% blue, 84% red and 6% black. 27 A color has a reflection spectral response of less than 10% to light with a wavelength shorter than 650 mμ, and the color is Process Blue 4.6% Reflex Blue 1.0% Transparent White 46.4% Opaque White 11.3% Warm Red 20.4% Rubin Red 12.3% The non-copyable paper according to claim 25, which is a mixture consisting of 4.1% black, or 7.5% process blue, 1.5% reflex blue, 38.9% warm red, 45.3% rubin red, and 6.8% process black. 28. A non-copyable paper according to claim 25, in which the color has a nearly zero reflection spectral response to light having wavelengths shorter than 600 mμ. 29. The non-copyable paper according to claim 25, comprising a white paper substrate coated with ink of said color. 30. said color is applied during manufacturing, said color has the following composition: process blue 4.6% reflex blue 1.0% transparent white 46.4% opaque white 11.3% warm red 20.4% rubin red 12.3% black 4.1%; Alternatively, the non-copyable paper of claim 25 is an ink having the following composition: Process Blue 7.5% Reflex Blue 1.5% Warm Red 38.9% Rubin Red 45.3% Process Black 6.8%. 31 Claim 25 consisting of a white paper substrate to which a transparent film of the color described above is attached.
Paper that cannot be copied as described in section. 32. The non-copyable paper according to claim 31, wherein the transparent film comprises a plurality of overlapping layers. 33 Transparent film at a wavelength of 600 mμ
a first red layer having a transmission spectral response less than 100% and increasing to 75% for wavelengths of 650 mμ, and a second red or blue layer having a transmission spectral response of 50% for wavelengths between 600 and 700 mμ. The first layer and the second layer are 600m long.
Claim 3 providing a reflection spectral response of less than 10% for light having a wavelength shorter than μ
Paper that cannot be copied as described in item 2. 34. In inks suitable for use as non-copyable inks, 10% for light with a wavelength shorter than 600 mμ and 10% for light with a wavelength longer than 650 mμ.
has a substantially greater reflectance spectral response;
An ink comprising a mixed ink of red and blue. 35 10% for light with a wavelength shorter than 620 mμ
Blue 5 has a smaller reflectance spectral response
%, white 57%, red 32% and black 4% or blue 9% and red 84%
35. The ink according to claim 34, wherein the ink is a mixture of: and 6% black. 36 10% for light with a wavelength shorter than 650 mμ
has a lower reflectance spectral response, and the mixed ink is a mixture consisting of Process Blue 4.6% Reflective Blue 1.0% Transparent White 46.4% Opaque White 11.3% Warm Red 20.4% Rubin Red 12.3% Black 4.1%, or Process Blue 36. The ink according to claim 35, which is a mixture consisting of 7.5% reflex blue, 1.5% warm red, 38.9% rubin red, 45.3% rubin red, and 6.8% process black.