JP4452794B2 - Intaglio printed matter having anti-counterfeit structure and discrimination method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
Unlike the latent image intaglio based on the conventional principle in which a latent image appears only by observing the printed material at an angle, the present invention has a special micro slit pattern structure in which the latent image appears due to the difference in the intensity of the direct reflected light. The present invention relates to an intaglio printed matter having a line drawing and / or a dot pattern structure, and a discrimination screen for authenticity discrimination.
[0002]
[Prior art]
As a method for preventing duplication of securities such as banknotes, stock certificates, bonds, gift certificates, ID cards, immigration cards, registration certificates, etc., it is disclosed in Japanese Patent Publication No. 56-19273. An image array having a uniform dimension of an intaglio-printed three-dimensional pattern element, and a document or image configured such that a mark appears or disappears when one of the background arrays is different from the other dimension Documents configured so that the mark appears or disappears due to different line orientations in the array and the background array, or the mark appears or disappears if the element is a dot and the other array is between the elements of one array Documents structured as such are disclosed.
[0003]
Further, as shown in Japanese Patent Laid-Open No. 60-155492, a group of parallel raised segments having two heights alternately extend in two predetermined different directions, A security is disclosed having a hidden image formed by the higher swell segment and a background forming the background of the design by the lower segment and at least two hidden images.
[0004]
Furthermore, as shown in Japanese Patent Application Laid-Open No. 55-117869, a pattern is formed by a line formed with ink at an appropriate height and a low line formed with ink at a low height, and an appropriate pattern is formed. An anti-counterfeit printed matter having a corresponding low line is disclosed.
[0005]
Furthermore, as shown in Japanese Patent Laid-Open No. 2-127478, a card having a mark forming portion in which a large number of fine grooves and protrusions are alternately formed in parallel with each other, and a part of the protruding shape There is disclosed a card in which a mark is formed by raising the card to other parts.
[0006]
Documents, securities, printed papers, cards, etc. obtained using the above-mentioned conventional techniques are arranged by increasing the height of a part of the lines or by arranging the lines or the height of the lines. And a hidden image such as a mark is formed by changing the direction of the image lines of the group.
[0007]
Since these conventional techniques use a slight difference in the height of an image line for displaying a hidden image such as a mark and an image line for displaying other portions, the hidden image is visually recognized. The hidden image such as a mark has a drawback that the visible range is extremely small and is difficult to understand.
[0008]
Further, an intaglio image line with a part of the image line made high is easily produced by a plate surface preparation method by a stepwise corrosion method, and therefore forgery is easy. The latent image intaglio using the difference in the arrangement direction of the image lines can be easily copied by a copying machine, and when the copy is tilted, the area ratio of the image portion to the non-image portion is the image arrangement direction. Because of this difference, it has a latent image revealing function.
[0009]
In addition, the one that forms a hidden image such as a mark by changing the orientation of the lines of the array or group is different from the portion that forms a hidden image such as a mark in a portion that does not form a hidden image such as a surrounding mark. There is a drawback that it stands out unnaturally, and there is a problem that the design is restricted. Furthermore, if the arrangement or orientation of the line of the group is configured so that the portion where the hidden image such as the mark is formed does not become unnatural compared to the portion where the hidden image such as the surrounding mark is not formed, the hidden image such as the mark can be visually recognized. There was a drawback that the range was extremely small and difficult to understand.
[0010]
Furthermore, in recent years, counterfeiting of US dollar bills is not limited to the level of two-dimensional copying by digital color copiers, etc., but using intaglio printing presses of the same type as intaglio printing presses used for the manufacture of genuine bills. The situation is getting worse until elaborate counterfeiting is made by intaglio printing. In such a counterfeit ticket, even a conventional latent image intaglio using a difference in the arrangement direction of simple lines etc. has already been easily forged, making it difficult for even experts to determine authenticity It has become.
[0011]
In response to this background, it is necessary to use an optically variable intaglio ink that shows dichroism depending on the viewing angle, or to attach an optically variable element such as a hologram. The new adoption of the conductive element results in a very significant increase in material cost and production cost. Therefore, a highly confidential anti-counterfeiting technology that does not easily reveal that it is an anti-counterfeiting technology at first glance without significantly increasing the material cost and production cost, As a result, there is a need for a method for distinguishing it from a counterfeit ticket that does not require special equipment.
[0012]
[Problems to be solved by the invention]
The present invention provides an intaglio line drawing and / or intaglio dot pattern with a micro slit pattern structure that is not noticed at first glance as a latent image intaglio and does not reveal latent image information only by tilting. It is an object of the present invention to make it possible to easily confirm the latent image information by overlapping the discrimination screen.
[0013]
[Means for Solving the Problems]
The present invention has a basic image composed of a line drawing and / or a dot pattern on a substrate, and the basic image includes a background image portion and a message image portion to which at least one latent image is applied. As a uniform solid print area that cannot be resolved by the naked eye and is included in each image line and / or each dot of the line image and / or dot pattern that is divided and divided as the background image portion. An angle in the arrangement direction of a slit pattern structure of a fixed shape that is fine enough to be recognized, and each of a line drawing and / or a dot pattern divided as a message image portion subjected to the at least one latent image An arrangement of a slit pattern structure with a fixed shape in the image line and / or in each dot that cannot be resolved with the naked eye and is recognized as a uniform solid print area. Direction angles are intaglio printed material having a forgery prevention structure different from each other.
[0014]
The micro slit pattern structure is a slit pattern structure having a straight line pattern with equal intervals in which the ratio of the image portion to the non-image portion (non-image portion / image portion) is about 1 to 0.3. An intaglio printed matter having an anti-counterfeit structure characterized by being.
[0015]
Further, in the basic image, the slit width and slit pitch of the micro slit pattern structure included in each image line and / or each dot of the line image and / or dot pattern classified as the background image portion are small. However, the slit width and the slit pitch of the micro slit pattern structure included in each image line and / or each dot of the line image and / or dot pattern divided as one or more message image portions, respectively, It is an intaglio printed matter having an anti-counterfeit structure characterized by being identical.
[0016]
The message image portion in the basic image is an intaglio printed matter having a forgery prevention structure characterized in that it is a meaningful image expressing characters, symbols, and the like.
[0017]
Further, the basic image is characterized in that an image having an arbitrary gradation is expressed by changing the line width and / or dot diameter of each of the line drawing and / or dot pattern stepwise and / or continuously. Intaglio printed matter having a forgery prevention structure.
[0018]
The basic image is an intaglio printed matter having an anti-counterfeit structure characterized in that it is a tint block pattern.
[0019]
In addition, a discrimination screen made of a substrate such as a transparent film having a line pattern image having the same pitch as the micro slit pattern structure placed in the intaglio print is superimposed on the intaglio print, and the discrimination screen is rotated. Authenticity determination of an intaglio printed matter having an anti-counterfeit structure, wherein at least one warning message is expressed in order, and the intaglio printed matter and a copy are discriminated based on the presence or absence of the warning message. Is the method.
[0020]
A transparent film base for discriminating the authenticity of the intaglio print on the discrimination screen having a line pattern with a pitch that interferes with an image of a line pattern with the same pitch as the micro slit pattern structure placed in the intaglio print. It is a discriminator made of materials.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of an intaglio printed matter having a forgery preventing structure according to the present invention will be described with reference to the drawings. According to the present invention, a basic image composed of a line drawing and / or a dot pattern, which is divided into a background image portion and a message image portion on which at least one latent image is applied, is arranged on a base material. The angle in the array direction of a slit pattern structure with a constant fineness that cannot be resolved with the naked eye within each image line and / or dot of the section and is recognized as a uniform solid print area Are different from each other.
[0022]
The intaglio printed matter having an anti-counterfeit structure according to the present invention can be observed by tilting in the same manner as in the latent image intaglio image forming method based on the prior art, and the minute slits in the background image portion and the message image portion. Since the pattern structure is a multi-line slit pattern structure with a resolution that exceeds the resolution of the human eye, there is no difference in density between the background image portion and the message image portion. Is not expressed.
[0023]
As described above, the anti-counterfeiting effect is surely exhibited by applying the minute slit pattern structure to the line drawing and / or dot pattern image constituting the basic image. The present invention will be further described below with reference to examples including production steps.
[0024]
【Example】
FIG. 1 shows a combination of two line patterns in which the pitch and line width of the line patterns are both equal and there is virtually no density difference between them, with their arrangement directions different from each other by 90 degrees. A conventional latent image in which a latent image of character information “OK” appears due to a change in the concealment rate of the non-image area (printing base material) due to the height component of the intaglio ink when the printed material is tilted and observed. The model figure of an intaglio image is shown. Specific design values of the line pattern include a pitch of 400 μm and a line width of 200 μm.
[0025]
If the pitch of the two line patterns is gradually made finer (the line width is reduced), the line pattern, that is, the texture cannot be discriminated with the naked eye. It is recognized as a uniform solid print area. The specific pitch and line width of the line pattern at this time can be understood to be about 30 microns width from FIG. 2 showing the spatial frequency characteristics of the naked eye widely known from the past. Therefore, even if a line pattern having a line pattern pitch of about 60 microns and a line width of about 30 microns is used for the latent image intaglio according to the conventional principle, it is observed only as a uniform solid print to the naked eye. However, no matter how obliquely the printed matter is observed, the concealment ratio of the non-image part due to the height component of the intaglio ink cannot change, and the latent image according to the conventional principle can no longer be manifested. ,it is obvious.
[0026]
FIG. 3 shows a basic image A that represents a human face image by continuously changing the line width and diameter in a line drawing and / or dot pattern, which is the basis for applying the micro slit pattern structure of the present invention. It is. Since the present invention is to provide a slit pattern structure within the line drawing and / or dot pattern drawing line and / or within the dot, the outline feature of the line or dot pattern in the basic image, With respect to the layout feature, there is no problem in the manufacturing method of the present invention and no fading in the effect of the invention. Therefore, the images used for the basic image include various line drawings such as those in which lines and dots are mixed in a unit area, wavy line patterns, concentric circle patterns, striated patterns, or array patterns having minute characters as array elements. And / or a dot pattern is conceivable and is not limited to the present invention.
[0027]
FIG. 4 is a latent image that appears when observed by a special method or when a discrimination screen is overlaid. The latent image is composed of characters “OK” and “COPY”.
[0028]
FIG. 5 shows the intersection of the basic image A in FIG. 3 and the latent image in FIG. 4, which is a message image portion B and a message image portion C. As for the message image part B, the intersecting part is extracted in units of one dot.
[0029]
FIG. 6 is an image of a part obtained by excluding the message image part B and the message image part C from the basic image A, and is a background image part D.
[0030]
There are two features of the present invention. The first feature is that in the two message image portions B and C and the background image portion D, a minute slit is formed in the line and / or dot pattern image and / or dot. Pattern structure, that is, an elongated shape that is regularly arranged in the same direction within a filled line drawing and / or dot pattern line and / or dot and is not normally observed with the naked eye with a gap width of about several tens of microns This is achieved by applying an unprinted white area. As in this embodiment, when an arbitrary gradation image is represented by a change in the line width or dot diameter as in the present embodiment, a minute slit pattern structure is applied to one image line or one dot. The size of the area must be constant, regardless of whether the line width or dot diameter representing the shadow part of the person's face image is large, or the line width or dot diameter representing the person highlight part. Don't be. It should be noted that the gradation of the basic image is lost if the area to which the slit pattern structure is applied is increased in accordance with the increase in the image line of the shadow portion and the dot diameter. Further, the two message image portions B and C and the background image portion D are characterized in that the arrangement directions of the minute slit pattern structures are different from each other.
[0031]
The second feature is that the micro slit pattern structure is a fine line pattern that cannot be distinguished with the naked eye. 2 showing the spatial frequency characteristics of the naked eye, when the slit width is finer than about 30 microns, the naked eye recognizes the line pattern as a uniform solid print region. In this embodiment, the pitch of the line pattern is 60 μm and the line width is 30 μm.
[0032]
The arrangement direction of the slit pattern structure is 0 degree in the left-right direction of the printed material, and the counterclockwise direction is plus rotation, 90 degrees for the message image part B, 45 degrees for the message image part C, and for the background image part D. The fine slit pattern structure was inserted into the basic image A at 0 degree. An intaglio printed matter is obtained from the line drawing and / or dot pattern with a fine slit pattern obtained at this time, and an enlarged schematic view thereof is shown in FIG.
[0033]
Since FIG. 7 is an enlarged view of the printed material, the slit pattern structure is confirmed. However, since the slit is sufficiently fine in the actual printed material, the inside of the dots and wavy lines is a uniform solid printed region. Only observed. In FIG. 7, an enlarged schematic diagram of the intaglio printed material in the vicinity of the boundary between the message image portion B with the minute slit pattern structure and the background image portion D, each indicated by a white square, is shown in FIG. 8, and the message image portion with the minute slit pattern structure is shown in FIG. An enlarged schematic view near the boundary between C and the background image portion D is shown in FIG. Note that both the enlarged schematic diagrams and FIGS. 8 and 9 are obtained by observing the printed matter from the front side (observer side) and the right oblique direction by tilting the printed matter in the vertical direction.
[0034]
As can be understood from the enlarged views of FIG. 8 and FIG. 9, the micro slit pattern structure in the background image portion and the message image portion is different only in the arrangement direction in the two regions. And there is no density difference in both areas of the message image portion. Therefore, as long as the original intaglio printed matter is normally observed, the latent image is not exposed. In addition, the difference in the arrangement direction of the micro slit pattern structure is designed to be finer than the resolution of the human eye, so the slit pattern structure cannot be identified with the naked eye, and is uniform. It is observed only as a printed area. Moreover, even if the difference can be identified using a magnifying glass or the like, it is extremely difficult to restore the entire latent image with the local information obtained by the magnifying glass.
[0035]
Next, the intaglio-printed line drawing and / or dot pattern with a micro slit pattern structure was observed obliquely in the same manner as in the latent image intaglio visualization method based on the prior art shown in FIG. However, even if an intaglio printed material with a fine slit-like structure that exceeds the resolution of the human eye is tilted, there is a difference in density between the background image and the message image. Therefore, the latent image is not developed.
[0036]
However, in the observation environment (FIG. 10) in which the printed matter (M) is held in the illumination direction (generally upward) and directly reflected light is actively taken in, the observer (L) The component of the directly reflected light is observed conspicuously (brightly white) in the observation environment of the intaglio printed matter of the present invention, and the message image portion B, that is, “OK” characters and the message image portion C, that is, “COPY” characters. These two latent image images are easily manifested and can be recognized as a negative image. In addition, the two latent image images have multi-level gradation, and the characters “OK” appear with a lighter gradation than the characters “COPY”.
[0037]
In addition, when the printed matter (M) is observed from the front under normal illumination, a strong light that saturates the ambient light is printed from the top and bottom of the printed matter using a flashlight or the like (N). When the printed matter is irradiated so as to be substantially parallel to the paper surface and the printed matter is observed from the front (FIG. 11), the direct reflected light component of the background image portion D is present to the observer (L). In the observation environment of the intaglio printed matter, the latent image of the message image portion B, that is, “OK” and the message image portion C, that is, “COPY” is easily observed. It can be recognized and recognized as a positive image. In addition, the two latent image images have gradation, and the characters “OK” appear with a darker gradation than the characters “COPY”.
[0038]
Note that whether the message image portion is manifested as a negative image or a positive image is not limited to the above two types of results, but depends on the orientation of the printed material when it is held in the illumination direction or the illumination irradiation direction. Thus, by using the light in the direct reflected light region, it is possible to easily extract the latent image stored in a highly confidential state.
[0039]
In the present invention, the slit pitch is 60 microns, the slit width is 30 microns (image width 30 microns), and the ratio of the image area portion to the non-image area portion is 1: 1, but the pitch is If the slit width is designed to be narrow as it is, the same latent image effect as described above can be exhibited even when the slit width is set to 20 microns (image width 40 microns). In addition, when the slit width is designed to be narrower than 20 microns, it is not preferable because it is easily affected by ink bleeding or blurring during printing.
[0040]
Another method for visualizing information in the message image portion is a method using a discrimination screen. The discrimination screen has an image of a line pattern having the same pitch as the pitch of the minute slit pattern structure applied in the intaglio printed material on a substrate such as a transparent film. Specifically, the pitch is 60. It has an image of a straight line pattern having a micron and an image line width of about 30 microns. The straight line pattern on the discrimination screen is formed on the transparent screen substrate by a print image of an arbitrary color or a groove pattern of unevenness.
[0041]
FIG. 12 illustrates a method for visualizing a latent image by overlapping a discrimination screen on an intaglio printed material and mutual interference between a slit pattern structure and a straight line pattern formed on the discrimination screen. is there. Note that, in a copy by a digital color copier or the like, since the slit pattern structure in the intaglio image line is not reproduced, the latent image is not visualized even if the discrimination screens are superimposed.
[0042]
The present invention has been described based on the embodiment of the present invention. However, the present invention is not limited to this, and various other embodiments are within the scope of the technical idea described in the claims. Needless to say, there are.
[0043]
【The invention's effect】
Unlike the latent image intaglio based on the conventional principle, the intaglio printed material in the present invention has high secrecy because it is not understood at first glance that the latent image intaglio is built there. It is also possible to secretly make a cipher using the high confidentiality. In addition, the slit pattern structure itself is very fine and requires advanced intaglio technology, so that forgery is very difficult.
[0044]
Further, the latent image intaglio according to the conventional principle was a simple pattern figure such as a line pattern, but the image used as the basic image in the present invention is a colored pattern, wave line, or image line. Arbitrary line drawing images such as portrait images whose interval and line width have changed continuously, and also arbitrary dot patterns with arbitrary figures such as polygons and star figures as array elements can be adopted. Since the basic image itself can represent any meaningful image, it is not subject to any design restrictions.
[0045]
Further, since the fine slit pattern structure formed in the image line exceeds the resolution of the digital color copying machine, the slit pattern structure is not reproduced in the copy. Accordingly, since the latent image does not appear when the discrimination screen is superimposed on the copy, it is possible to easily determine whether the image is true or false.
[0046]
The present invention is achieved by applying a minute slit pattern structure to an existing line drawing image called a basic image. Therefore, the line drawing designer does not consider the expressiveness of the latent image that is visualized by the special observation or the discrimination screen, and there is no special restriction on the design of the designer. Also, any person who does not have design knowledge can create a forgery-preventing printed matter, and work sharing becomes possible. In addition, line drawings and dot pattern designs that have already been stored in a database can be easily converted into line drawing designs with anti-counterfeiting effects by applying a micro slit pattern structure. Excellent efficiency.
[Brief description of the drawings]
FIG. 1 shows a conventional latent image intaglio.
FIG. 2 shows the spatial frequency characteristics of the naked eye.
FIG. 3 shows a basic image.
FIG. 4 shows a latent image.
FIG. 5 shows a message image part.
FIG. 6 shows a background image portion.
FIG. 7 shows a schematic diagram of an intaglio print.
FIG. 8 is an enlarged schematic view of the vicinity of the boundary between the message image portion B and the background image portion in the intaglio printed matter.
FIG. 9 is an enlarged schematic view of the vicinity of the boundary between the message image portion C and the background image portion in the intaglio printed matter.
FIG. 10 shows an observation environment for observing a printed material over the illumination direction.
FIG. 11 shows an example of an observation environment using intense light.
FIG. 12 is a diagram showing a latent image formed by superimposing a discrimination screen on an intaglio print.
[Explanation of symbols]
A Printing paper B Contour image area C Upper bottom surface D Cutter path for engraving the contour image area E Cutter path for engraving the upper surface on the background F Density reference image G Light source H Observer J Intaglio print K Light source L relatively stronger than ambient light Film M Straight line pattern N Latent image

Claims (7)

A basic image having a line drawing and / or a dot pattern is formed on a substrate, and the basic image is divided into a background image portion and a message image portion having at least one latent image, A slit pattern structure composed of an image line portion and a non-image line portion is arranged in a predetermined direction in each image line and / or each dot of the line image and / or dot pattern classified as the background image portion, and the at least one A slit pattern structure consisting of a line part and a non-line part in each line and / or each dot of a line image and / or dot pattern classified as a message image part having two or more latent images The angle of the arrangement direction of the slit pattern structure of the background image portion and the angle of the arrangement direction of the slit pattern structure of the message image portion are different from each other. Ri and intaglio prints having a forgery prevention structure the pitch of the image area of the slit pattern structure is characterized in that it does not exceed 60 microns. The intaglio printed matter having an anti-counterfeit structure according to claim 1, wherein the image line portion and the non-image line portion are straight lines with equal intervals.   In the basic image, a line pattern and / or dot pattern segmented as a background image section, and / or a slit pattern structure line composed of a line portion and a non-line portion included in each dot. The width of the image area and the width of the non-image area, and at least one line image and / or an image line included in each dot of the dot pattern divided as the message image area 3. The intaglio printed matter having an anti-counterfeit structure according to claim 1 or 2, wherein the width of the image portion and the width of the non-image portion of the slit pattern structure composed of a portion and a non-image portion are the same. .   The intaglio printed matter having an anti-counterfeit structure according to claim 1, 2 or 3, wherein the message image portion in the basic image is a meaningful image expressing characters and symbols.   The basic image represents an image having an arbitrary gradation by changing the line width and / or dot diameter of each of the line drawing and / or dot pattern stepwise and / or continuously. An intaglio printed matter having the anti-counterfeit structure according to 1, 2, 3 or 4.   6. The intaglio printed matter having an anti-counterfeit structure according to claim 1, wherein the basic image is a tint block pattern.   By superimposing a discriminating screen made of a transparent film substrate having an image of a line pattern with the same pitch as the slit pattern structure placed in the intaglio printed matter on the intaglio printed matter, and rotating the discriminating screen, 7. The counterfeit according to claim 1, wherein at least one warning message is generated in order, and the printed material and the copied material are discriminated based on the presence or absence of the warning message. A method for determining the authenticity of an intaglio printed matter having a prevention structure.

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