JP2002254792A - Printed matter capable of discriminating authenticity using minute slit image and discrimination method thereof - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To be applied to a valuable printed matter that requires forgery prevention, and by tilting the printed matter, a latent image appears to enable authenticity determination. SOLUTION: A basic image (2) of a surface is provided on a substrate (1) having a light transmitting property, and the basic image is composed of a line drawing and / or a dot pattern. , A background image portion, and a message image portion on which at least one latent image has been applied, wherein the background image portion and the message image portion are within a line image and / or a dot pattern, respectively. Alternatively, the basic image (2) of the substrate (1) having the light-transmitting property, in which the arrangement direction of the slit pattern structure having a certain shape that cannot be recognized by the naked eye in each dot has a different angle and is printed. A light-reflective substrate (4) is provided on the back surface of the region to obtain a printed matter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a latent image provided in a basic image which is applied to a valuable printed matter which needs to be prevented from forgery or falsification of banknotes, stock certificates, securities, passports, cards and the like. The present invention relates to a printed matter, in which the latent image cannot be identified with the naked eye when the image image is observed from directly above the printed matter and the printed matter is tilted, and the latent image appears and can be discriminated from the authenticity, and a method for determining the same. It is.

[0002]

2. Description of the Related Art Conventionally, in the case of banknotes, stock certificates, securities, passports, cards, and other valuable printed materials that need to be prevented from being forged or altered, a latent image can be recognized by obliquely observing the printed material. Techniques for performing true / false discrimination are known, and those using the image configuration of an intaglio printed matter, those using an uneven substrate and a printing image, those using a lenticular plate, and a regular image pattern Examples include a hologram to be used and a hologram.

[0003] A device that makes a latent image appear by utilizing the image configuration of the intaglio printed material, for example, an image portion which becomes a latent image on an intaglio-printed line is composed of a high image, and other intaglio printing is performed. The non-image part of the print object is constituted by an object lower than the object part. For this reason, there has been disclosed a device in which the image portion is earlier than the non-image portion when observing the printed matter at different angles, the line interval is closed by the height of the image, and a latent image appears ( JP-B-56-19273). However, in this method, the latent image does not appear from the direction of the line, and only appears in the direction perpendicular to the line. Further, since the latent image is expressed only by the height difference between the image portion and the non-image portion, the angle at which the latent image can be viewed is limited, and the latent image cannot be easily confirmed. Further, there is a type in which a latent image is developed by uniform widths of image lines and different directions. However, this method has a drawback that a place where a latent image is formed can be easily confirmed visually. Further, since printing must be performed by the intaglio printing method, there is a problem that the cost is higher than other printing methods.

Using the irregular substrate and printed image,
For example, the applicant has various line patterns or relief patterns,
And a material having one of the concavo-convex shapes of any of these patterns, and various line drawing or halftone drawing having a constant interval by a different color other than the color of the material and colorless and transparent, and a drawing of both of them. It is registered as a latent image pattern forming body and a manufacturing method thereof (Japanese Patent No. 2615401) in which a specific character, pattern, or the like can be recognized only when observing the printed matter at different angles by combining any of the lines. ing. However, there is a drawback that it is difficult to print a material having an uneven shape with various line objects or halftone dot objects.

[0005] A calendar using the lenticular plate, for example, a lenticular plate, is disclosed as a calendar which allows the user to selectively view the calendar display of the current month and the next month by changing the observation angle (Jpn. 6
No. 7043). However, the lenticular plate is expensive, and the lenticular lens itself is thick,
Since the product itself has a thickness, it is not suitable for thin printed matter, and the lenticular plate has an uneven shape, so that it is easily deformed and may be damaged.

The one utilizing the regular image pattern, for example, a substantially transparent base material, a first counterfeit discriminating layer formed on one surface of the base material, and A forgery discrimination medium having a second forgery discrimination layer formed, wherein the second forgery discrimination layer has a regular pattern,
The first forgery discrimination layer includes a pattern area of a pattern having a period shifted from the pattern of the second forgery discrimination layer, and the pattern area is a pattern of the second forgery discrimination layer when viewed from above the base material. The forgery is characterized in that it appears to be uniformly painted, but when viewed obliquely, the base material overlaps with the pattern of the second forgery discrimination layer, and its shape can be discriminated. It is disclosed as a discrimination medium (JP-A-11-254869). However, it is difficult to print the first counterfeit discriminating layer and the second counterfeit discriminating layer, and the latent image can be recognized only at a specific angle, and different latent images appear at all angles. could not. Further, it was not possible to design by superposing two or more latent image images. For this reason, it is too simple in terms of forgery prevention, and there is room for improvement.

[0007] In recent years, holograms have been proposed as means having a high anti-counterfeiting effect. However, holograms are expensive due to advanced technology and equipment and are not suitable for small-quantity production.

[0008]

From the above, it is an object of the present invention to solve the above-mentioned problems, and each of the tables of light-transmitting base materials having a thickness of not less than micron is shown in Table 1. When printing with a fine slit pattern structure in the image and / or in each dot and a light-reflective substrate is provided on the back of the substrate, the slit pattern structure on the front of the substrate is When the printed material is reflected and projected on the material, and the printed material is tilted, it is found that, depending on the thickness of the base material, the image portions projected on the back light-reflective substrate from the non-image portions of the front slit pattern structure are recognized. .

When the latent image applied to the basic image is observed from directly above the printed matter, the latent image cannot be identified with the naked eye, and the printed image is tilted to produce a true image in which the latent image appears. It is a printed matter that can be falsely discriminated and its discriminating method, and it is possible to design by superposing two or more latent images, so it is easy to use other printing methods other than the intaglio printing method without being limited by design. Low cost, no front and back combined printing, no printing problems, no need for lenticular lens, can be used for thin products, design has multiple latent images at different viewing angles It is an object of the present invention to propose a printed matter that can be authenticated by any person without using an authenticity discriminating device or the like, and a method of identifying the printed matter.

[0010]

According to the present invention, when a latent image applied to a basic image is observed from directly above a printed matter, the latent image cannot be identified with the naked eye. By tilting the printed matter, the printed matter in which the latent image appears can be identified as true or false, on the surface on the substrate having light transmittance,
A basic image composed of a line drawing and / or a dot pattern, wherein the basic image is divided into a background image portion and a message image portion on which at least one latent image is applied, and is divided as the background image portion; Fineness that cannot be recognized by the naked eye within each image line and / or each dot of the drawn line drawing and / or dot pattern, and is recognized as a print area close to uniform solid with low brightness The angle in the arrangement direction of the slit pattern structure having a constant shape, and the inside of each image and / or each dot of a line image and / or a dot pattern divided as a message image portion provided with the at least one latent image A fine slit pattern with a constant fineness that cannot be recognized by the naked eye inside and is recognized as a print area close to a uniform solid with low brightness The angle in the arrangement direction of the structure is printed so as to be different from each other, and a light-reflective substrate is provided on the back surface of the region where the basic image is printed on the light-transmissive substrate. This is a printed material that can be falsely identified.

(2) Further, according to the present invention, when the latent image applied in the basic image is observed from directly above the printed matter, the latent image cannot be identified with the naked eye and the printed matter is tilted. In the printed matter in which the latent image appears, the line drawing and / or
Or a basic image composed of a dot pattern, wherein the basic image is divided into a background image portion and a message image portion on which at least one or more latent images are applied, and the line image is divided as the background image portion. And / or a fixed shape of fineness that cannot be recognized by the naked eye in each image line and / or in each dot of the dot pattern, and is recognized as a print area close to uniform solid with low brightness. And the angle in the arrangement direction of the slit pattern structure, and within each image and / or each dot of a line image and / or a dot pattern divided as a message image portion on which at least one or more latent images are applied. An array of minute slit pattern structures with a constant fineness that cannot be recognized by the naked eye but are recognized as a print area with low brightness and close to a uniform solid Direction angle is printed so as to be different from each other, and authenticity discrimination characterized by having a light reflective base material on the back surface other than the area where the basic image is printed on the light transmissive base material Possible printed matter.

(3) Further, the present invention is the printed matter capable of distinguishing between true and false as described in (1) or (2), wherein the fine slit pattern structure is a straight line pattern at equal intervals. .

(4) In the present invention, the background image portion and the message image portion cannot be recognized by the naked eye provided in each line and / or dot pattern of each line and / or each dot. The angle at which the arrangement direction of the minute slit pattern structure having a constant fineness that is recognized as a print area close to a uniform solid with low brightness is in a range of 30 degrees to 150 degrees. This is a printed matter that can be determined as authenticity described in (1), (2) or (3).

(5) In the present invention, the background image portion and the message image portion cannot be recognized by the naked eye provided in each line and / or dot pattern of each line and / or each dot. The gap width of a slit pattern structure having a constant fineness that is recognized as a print area close to a uniform solid with a low brightness is 40 μm to 1 μm.
(1) characterized by a gap width of 00 microns.
(2), (3) or (4), which is a printed matter that can be authenticated.

(6) In the present invention, the line drawing and / or dot pattern of the background image portion and / or the line drawing and / or dot pattern of the message image portion may be both or any one of the line drawing and / or the dot pattern. (1), (2), (3), characterized in that an image having an arbitrary gradation is expressed by changing the line width or dot system of each pattern stepwise and / or continuously. The printed matter according to (4) or (5), in which the authenticity can be determined.

(7) The present invention is characterized in that the basic image is any one of a color pattern, a relief pattern and a ground pattern or a combination thereof.
(2), (3), (4), (5) or (6).

(8) The present invention is a method of authenticity discrimination, wherein the printed matter described above is overlapped with the basic image and the light-reflective base material, and the printed matter is tilted to determine the authenticity. .

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention has a basic image composed of a line drawing and / or a dot pattern on a surface of a light-transmitting substrate, wherein the basic image includes a background image portion,
At least one latent image is divided into a message image portion, and the line image and / or dot pattern divided as the background image portion is in each image line and / or
Or, the angle in the arrangement direction of the slit pattern structure having a uniform shape with a fineness that cannot be recognized by the naked eye held in each dot and is recognized as a print area close to a uniform solid with low lightness, and A line pattern and / or dot pattern classified as a message image portion on which at least one latent image has been applied cannot be recognized by the naked eye in each image line and / or in each dot, and has a uniform brightness of low brightness. The angle in the arrangement direction of the fine slit pattern structure having a constant fineness such that it is recognized as a print area close to the printing area is different from each other, and, the basic image of the substrate having the light transmittance Is a printed matter having a light-reflective base material on the back surface of the area where is printed. As long as the printed matter is observed from directly above, that is, as long as the observation point is placed on the vertical line of the printed matter surface and the printed matter is observed, the background image portion and the message image portion are printed with a fine minute slit pattern structure. The print area is recognized as a thin and nearly solid print area, and visualization of the latent image due to the difference in the arrangement direction of the minute slit patterns in the background image portion and the message image portion does not occur.

However, when the printed matter is obliquely tilted in the vertical direction, that is, the printed matter is observed by moving the observation point in a direction in which the line of sight is equal to the plane of the printed matter, the printed matter is arranged in the left-right direction. In a background image portion having a fine slit, a light-reflective substrate in which a fine slit pattern structure of the background image portion printed on a light-transmissive substrate is provided on the back surface of the light-transmissive substrate Is reflected on the non-image area of the slit as if it were actually printed on the base material, the apparent slit width is reduced, or the slit disappears depending on the observation angle, the brightness decreases, and the brightness decreases. Recognized in a darkly filled state. On the other hand, in the message image portion having minute slits arranged at an angle close to the top or bottom direction of the printed matter, or in the non-image portion of the minute slit in the message image portion with respect to a change in the observation angle in the top and bottom direction, Since the image area reflected on the light-reflective substrate rarely appears in the light-reflective base material, the change in the brightness difference hardly occurs. Therefore, when observing the printed matter while tilted in the vertical direction, the message image portion has a bright brightness difference and is visualized and observed from the background image portion.

Further, according to the present invention, a basic image composed of a line drawing and / or a dot pattern is provided on a surface of a substrate having a light transmitting property, and the basic image includes at least one background image portion. The above-described latent image is divided into the message image portion, and the line image and / or dot pattern divided as the background image portion cannot be recognized by the naked eye in each image line and / or in each dot. As an angle in the arrangement direction of a slit pattern structure having a uniform fineness such that it is recognized as a print area close to a uniform solid with a low brightness, and a message image portion on which at least one or more latent images are applied. As a print area that is not recognizable to the naked eye within each image line and / or within each dot of the divided line drawing and / or dot pattern and is close to a uniform solid with low brightness The angle in the arrangement direction of the fine slit pattern structure of a fixed shape of fineness that is perceived is printed so as to be different from each other, and other than the region where the basic image of the substrate having the light transmittance is printed It is a printed matter that can be distinguished from the authenticity characterized by having a light reflective base material on the back surface of the printed matter, and the same effect as above can be obtained by overlapping the basic image of the printed matter with the light reflective base material and tilting the printed matter Can be

Further, when observing the printed matter while obliquely observing it from the arrangement direction of the minute slit pattern structure of the background image portion, the negative / positive can be inverted. Further, by printing a plurality of message image portions having different minute slit pattern structures, and observing the printed matter by tilting and rotating the printed matter, different message image portions can be continuously observed.

By making the minute slit pattern structure of the present invention into a straight line pattern of equal intervals, when observing the printed matter while obliquely observing the printed image, the difference between the background image portion and the message image portion becomes clear, so that the message image is more clearly displayed. The visibility of the latent image of the part is improved.

According to the present invention, the background image portion and the message image portion cannot be recognized by the naked eye provided in each line and / or dot pattern of each line drawing and / or each dot, and the brightness is low and uniform. In order to improve the latent image effect when observing the printed matter at a different angle in the arrangement direction of the minute slit pattern structure having a constant fineness so as to be recognized as a printing area close to solid, the background image part When the angle in the arrangement direction of the line image is 0 degrees, the angle in the arrangement direction of the line image in the message image portion is 30 degrees to 150 degrees
It is preferably in the range of degrees. More preferably, when the angle in the arrangement direction of the line image in the background image portion is 0 degrees, the angle in the different arrangement direction of the line image in the message image portion is preferably in a range of 90 degrees. For example, three message images are added to the basic image. If it is inserted, and if the background image portion is set to 0 degree, the angle in the arrangement direction of the message image portion may be set to 45, 90, or 135 degrees.

When the printed matter of the present invention is observed from directly above, in order to prevent the message image portion from being recognizable, the background image portion and the message image portion must be within the respective lines of the line drawing and / or the dot pattern and And / or the gap width of a slit pattern structure having a uniform shape with a fineness that cannot be recognized by the naked eye included in each dot and is recognized as a print area having a low brightness and close to a uniform solid is 40 μm to 100 μm. Preferably, the gap width is microns.

Further, according to the present invention, the line image and / or dot pattern of the background image portion and the line image and / or dot pattern of the message image portion are provided.
Alternatively, in a dot pattern, an image having an arbitrary gradation is expressed by changing stepwise and / or continuously the line width and / or the dot system of both or one of the line drawing and / or the dot pattern, and forgery The prevention can be improved.

The transparent substrate of the present invention is preferably a transparent substrate, but may be any substrate capable of transmitting light.
Translucent substrates having color can also be used. As the material, for example, polyethylene, polypropylene, polyester, nylon polyurethane, polyvinyl chloride, polyvinyl acetate, polyacryl and the like are used.

The thickness of the light-transmitting substrate of the present invention is as follows:
There is no particular limitation, and the present invention is also effective for a thin base material of about 60 microns to a card base material of about 760 microns. When the base material is thick, the effect is produced even when the angle of inclination of the printed matter is small. If it is thin, the effect can be obtained by increasing the angle of inclination of the printed matter.

As the light-reflective substrate of the present invention, a metal foil having a high surface reflectance such as an aluminum foil, a gold foil, a silver foil or the like can be used, and the same material as the metal foil may be metal-deposited on the back surface of the printed matter. Further, the use of a hologram as the light-reflective substrate improves the forgery prevention effect.

The printing means used in the printing of the present invention is not limited, and can be printing means such as offset printing, gravure printing, flexographic printing, intaglio printing, and the like. Also,
In the adjustment of the printing press, no special adjustment is required, and printing can be performed with general settings.

When the slit width of the present invention is large, the image line width is inevitably small, and the brightness of the entire printed matter is low. Therefore, the printed pattern is suitable for use as a background image, such as a tint block printing or a relief pattern, in securities.

Specifically, the present invention expresses a photograph of a person's face by a special screen method for expressing an arbitrary continuous tone image by continuously changing the size of array elements such as minute characters. Then, ID information for identifying the person, for example, information such as the date of birth is adopted in the message image portion. Forgers can use a special screen method that is an existing technology to forge a face photograph of a person different from the printed matter with a high degree of perfection, but also imprint even the minute slit pattern structure inserted inside the array element It is difficult to forge.

[0032]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples, but the content of the present invention is not limited to the scope of these Examples. In this embodiment, the adhesive layer is provided on the back surface of the transparent film and the metal foil is attached. However, in the present invention, the adhesive layer may not be provided if the transparent film and the metal foil are adjacent to each other.

FIG. 1 is a diagram showing the basic principle of the present invention. FIG. 1A shows a structure in which a basic image 2 is printed on a transparent film substrate 1 at a predetermined pitch width, and an adhesive layer 3 and a metal foil 4 are laminated and printed on the back surface of the transparent film substrate 1. The basic image 2 printed on the transparent film substrate 1 is projected as a basic image 2 'on a metal foil 4 having light reflection. When this printed matter is observed from the X direction shown in FIG. 1A, as shown in FIG. 1B, the basic image 2 is not affected by the basic image 2 'projected on the metal foil, and When this printed matter is observed from the Y direction shown in FIG. 1A, the non-image area of the basic image 2 is determined from the thickness of the transparent film substrate 1 as shown in FIG. Since the image portion of the basic image 2 ′ projected on the metal foil from the image is recognized, it can be recognized as a nearly solid image.

(Embodiment 1) FIG. 2 shows an image of a person by continuously changing the drawing width and diameter of a line drawing and / or a dot pattern, which is the basis for applying the fine slit pattern structure of the present invention. Is the basic image A. Since the present invention is to provide a slit pattern structure in an image of a line drawing and / or a dot pattern and / or in a dot, a contour feature of a pattern of a line or a dot in a basic image, a line or a dot. With respect to the above arrangement feature, there is no inconvenience in the production method of the present invention and no inferiority in the effect of the invention. Therefore, as the image used for the basic image, various line drawings such as an image in which lines and dots are mixed in a unit area, a wavy line pattern, a concentric pattern, a colored pattern, or an array pattern having minute characters as array elements are used. And / or dot patterns,
It is not limited to this embodiment.

FIG. 3 shows a latent image that appears when the printed matter is observed at an angle, and is composed of characters "OK" and "COPY".

FIG. 4 shows the intersection of the basic image A of FIG. 2 and the latent image of FIG.
K) and the message image part C (COPY). In addition,
As for the message image B, intersections are extracted in units of one dot.

FIG. 5 is an image of a part obtained by excluding the message image part B (OK) and the message image part C (COPY) from the basic image A, which is a background image part D.

In the two message image portions B and C and the background image portion D, a minute slit pattern structure is formed in the image of the line drawing and / or the dot pattern and / or in the dot.
That is, in an image line and / or a dot of a filled line drawing and / or a dot pattern, an unprinted white, elongated shape having a gap width of about 40 to 100 microns regularly arranged in the same direction. This is achieved by applying a punch-through area. As in the present embodiment, when a basic image is expressed as an arbitrary gradation image by a change in image width or dot diameter, a minute slit pattern structure is formed in one image or one dot. The size of the area to be applied must be constant irrespective of the part where the image width or dot diameter representing the shadow part of the person's face image is large and the part where the image width or dot diameter representing the highlight part of the person is small. Must. It should be noted that if the area where the slit pattern structure is applied is increased in accordance with an increase in the image area or dot diameter of the shadow portion, the gradation of the basic image is lost. Further, in the two message image parts B and C and the background image part D,
It is characterized in that the arrangement patterns of the minute slit pattern structure are different from each other.

In the present invention, the pitch of the minute slit pattern structure applied to the two message image portions B and C and the background image portion D is 128 microns, and the slit width is approximately 64 microns (at this time, the image line width is approximately 64 microns). The arrangement direction is 90 degrees for the message image portion B (OK), 45 degrees for the message image portion C (COPY), and the background image is as follows. 0 degree for part D, basic image A
Basic image 2
It was created. FIG. 6 shows a schematic diagram of the line drawing and / or dot pattern with the fine slit pattern structure obtained at this time.

FIG. 7A is an enlarged view of the vicinity E of the message image portion B (OK) having the fine slit pattern structure and the background image portion D shown in FIG. FIG. 7B is an enlarged view of the vicinity F of the boundary between (COPY) and the background image portion D.

As can be understood from the enlarged views of FIGS. 7A and 7B, the minute slit pattern structures in the background image portion and the message image portion differ only in the arrangement direction in both regions. , There is no density difference between both the background image portion and the message image portion. Therefore, as long as a normal original printed matter is observed, the message image is not exposed. Furthermore, even the difference in the arrangement direction of the minute slit pattern structure cannot be identified with the naked eye, and even if the difference can be identified using a magnifying glass or the like, even if the difference can be identified using a magnifying glass, the localization obtained with the magnifying glass With typical information, it is extremely difficult to restore the entire image of the message image.

As shown in FIG. 6, a plate making film was prepared using a commercially available laser plotter on the basis of the obtained basic image 2 having each image and / or dot pattern having a fine slit pattern structure. A commercially available positive PS plate was prepared from the plate making film, and the obtained printing plate was used to form a commercially available offset ink (black) on a transparent film substrate 1 having a thickness of 200 microns as shown in FIG.
Then, the front side of the basic image 2 was printed with a PS plate, and a commercially available metal foil 4 having an adhesive layer was attached to the back surface of the printed transparent film substrate 1 to obtain a printed matter of Example 1.

FIG. 9 shows a case where the obtained printed matter is observed from directly above. Since the image and / or dot pattern message with the minute slit pattern structure is designed with a finer resolution than the resolution of the human eye, the message image portion B (OK) and the message image portion C (COPY)
In addition, the background image portion D can be observed only as a print region close to a uniform solid with low brightness. Even if the difference can be used using a magnifying glass or the like, it is extremely difficult to restore the entire latent image with local information obtained by the magnifying glass.

FIG. 10A shows the obtained printed matter,
FIG. 5 is an enlarged view of a printed image observed obliquely from a message image portion B (OK) direction, that is, a direction of 90 degrees. 45
The message image portion C (COPY) set in degrees and the background image portion D set in 0 degrees are the message image portion C (COPY) reflected and projected on the metal foil 4 and the background image portion D set in 0 degrees. And an image and / or dot pattern message with a minute slit pattern structure cannot be recognized by the naked eye. Message image part B (O
K) is observing the printed matter as being tilted from the 90-degree direction as the message image portion B (OK), so that the message image portion B reflected and reflected on the metal foil 4 does not overlap with the background image without any overlapping portion. Part D, message image part C
And the message image portion B has a difference in brightness, so that the message image portion B can be recognized by the naked eye.

Similarly, FIG. 10 (b) is an enlarged view of a case where the printed matter is observed obliquely from the direction of the message image portion C (COPY), that is, the direction of 45 degrees. The message image portion B (OK) set at 90 degrees and the background image portion D set at 0 degrees are the message image portion B (OK) reflected and projected on the metal foil 4 and the background image portion set at 0 degrees. A portion overlapping with D occurs, and the image and / or dot pattern message with the minute slit pattern structure cannot be recognized by the naked eye. Since the message image portion C (COPY) observes the printed matter as being tilted from the 90-degree direction as the message image portion C (COPY), a portion overlapping with the message image portion C reflected and projected on the metal foil 4 occurs. Without this, a difference in brightness occurs between the background image portion D, the message image portion B, and the message image portion C, and the message image portion C can be recognized by the naked eye.

Next, a sample was prepared in order to determine a good slit width, and the obtained printed matter was tested for the visibility of a message image portion when the printed matter was observed while being tilted. The thickness of the transparent film substrate is from 80 microns to 200
A micron thickness was used. Regarding the evaluation method, there are three stages: ○, when it is clear that the message image is clearly expressed, 、, when it is not clear that the message image can be identified, ×, when it can hardly or not at all. Was evaluated. Table 1 shows the evaluation results.

[0047]

[Table 1]

Preferably, the slit width is between 40 microns and 100 microns.

(Example 2) Using the same PS plate as in Example 1, and using the obtained printing plate, a transparent offset ink (black) was applied on a transparent film substrate 1 having a thickness of 200 microns. As shown in FIG. 11 (a), a basic image 2 is printed on the front surface by a PS plate, and a metal having a commercially available adhesive layer in another area on the back surface of the transparent film substrate 1 so as not to overlap the basic image 2. The foil 4 was stuck to obtain a printed matter of Example 2.

As shown in FIG. 11B, the printed matter of the second embodiment is folded, and the basic image 2 and the metal foil 4 are overlapped.
By tilting the printed matter, the same effect as that of the printed matter of Example 1 was obtained.

Although the present invention has been described based on the embodiment, the present invention is not limited to this embodiment, and various other embodiments may be made within the scope of the technical idea described in the claims. Conceivable.

[0052]

The printed matter of the present invention is printed on a surface of a light-transmissive substrate having a thickness of at least a micron and having a fine slit pattern structure in each image and / or each dot on a table. When a light-reflective substrate is provided on the back of the material, the slit pattern structure on the front of the substrate is reflected and projected on the light-reflective substrate on the back, and when the printed material is tilted, the slit on the front depends on the thickness of the substrate. It was found that the image area projected on the back light-reflective substrate from the non-image area of the pattern structure was recognized, and when the latent image applied in the basic image was observed from directly above the printed matter, Since the latent image cannot be identified with the naked eye and the printed matter is tilted, a plurality of different latent images can be recognized by observing the printed matter at different angles in a plurality of different directions. Can be easily determined, and two or more latent images Because also it is possible to design Te,
No design restrictions.

As the authenticity discrimination method of the present invention, a basic image printed on a part of a substrate having a light transmitting property and a light reflecting base material adhered to another printed part of the base material having a light transmitting property Is superimposed and the printed matter is tilted, a message image portion appears, so that anyone can easily determine the authenticity on the spot without using an expensive authenticity identification device.

Furthermore, since a tint block pattern and a relief pattern can also be created, they are effective in preventing forgery and are not subject to design restrictions. In addition, printing can be easily performed by other printing methods other than the intaglio printing method, so that the cost is low, and there is no problem of printing because the front and back printing is not performed. Therefore, the present invention can be applied to a wide range of valuable printed materials such as polymer notebooks and identification cards that need to be prevented from forgery or falsification.

[Brief description of the drawings]

FIG. 1 is a diagram showing a basic principle of the present invention.

FIG. 2 is a diagram showing a basic image A on which a minute slit pattern structure of the present invention is applied.

FIG. 3 is a diagram showing a warning message that appears when the observation angle is changed according to the present invention.

FIG. 4 is a diagram showing a portion where the basic image A in FIG. 2 intersects with the warning message image in FIG. 3;

FIG. 5 is a diagram showing a background image portion D, which is an image of a part obtained by excluding a message image portion B (OK) and a message image portion C (COPY) from a basic image A.

FIG. 6 is a view showing a schematic view of an image and / or a dot pattern having a minute slit pattern structure.

FIG. 7 is an enlarged view showing the vicinity of a boundary between a message image portion with a minute slit pattern structure and a background image portion D.

FIG. 8 is a diagram showing a printed material according to the configuration of the present invention.

FIG. 9 is a diagram when the printed matter of the present invention is observed from directly above.

FIG. 10 is a diagram when the printed matter of the present invention is observed while being tilted.

FIG. 11 is a view showing a printed matter obtained by printing a basic image and a metal foil in another area according to the present invention, in a case where the basic image and the metal foil overlap each other.

[Explanation of symbols]

 A, 2 basic image B message image B C message image C D background image portion D E near the boundary between message image portion B and background image portion F near the boundary between message image portion C and background image portion 1 transparent film substrate 2 '' Basic image reflected and reflected on metal foil 3 Adhesive layer 4 Metal foil

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2C005 HA02 HB04 HB09 HB10 HB13 JA12 JB22 JB25 LA24 2H113 AA06 BA01 BA03 BA05 BB07 BB22 CA39 DA56 DA57 DA62 EA05 EA15

Claims (8)

[Claims] When a latent image image applied to a basic image is observed from directly above a printed material, the latent image image cannot be identified with the naked eye, and the latent image image appears by tilting the printed material. In a printed matter that can be distinguished between true and false, a basic image including a line drawing and / or a dot pattern is provided on a surface of a substrate having light transmittance, and the basic image includes at least one background image portion. The above-described latent image is divided into the message image portion, and the line image and / or dot pattern divided as the background image portion cannot be recognized by the naked eye in each image line and / or in each dot. ,
An angle in the arrangement direction of the slit pattern structure having a constant fineness that is recognized as a print area close to a uniform solid with low brightness, and a message image portion on which at least one or more latent images are applied are classified. Line drawing and / or
Or, a fine pattern of a uniform shape having a fineness that cannot be recognized by the naked eye included in each image line and / or in each dot of the dot pattern and is recognized as a print area close to a uniform solid with low brightness. The angle in the arrangement direction of the slit pattern structure, and printed so as to be different from each other, and, having a light-reflective substrate on the back surface of the region where the basic image of the substrate having light transmittance is printed. Printed material that can be authenticated. 2. A latent image formed in a basic image cannot be identified by the naked eye when observed from directly above a printed matter, and the latent image appears by tilting the printed matter. In a printed matter that can be distinguished from authenticity, a basic image composed of a line drawing and / or a dot pattern is provided on a surface of a substrate having light transmittance, and the basic image includes a background image portion and at least one The above-described latent image is divided into the message image portion, and the line image and / or dot pattern divided as the background image portion cannot be recognized by the naked eye in each image line and / or in each dot. ,
An angle in the arrangement direction of the slit pattern structure having a constant fineness that is recognized as a print area close to a uniform solid with low brightness, and a message image portion on which at least one or more latent images are applied are classified. Line drawing and / or
Or, a fine pattern of a uniform shape with a fineness that cannot be recognized by the naked eye in each image line and / or in each dot of the dot pattern and is recognized as a print area close to a uniform solid with low brightness. The angle in the arrangement direction of the slit pattern structure is printed so as to be different from each other, and the light-transmissive substrate has a light-reflective substrate on the back surface other than the region where the basic image is printed. A printed matter that can be identified as true or false. 3. The printed matter according to claim 1, wherein the fine slit pattern structure is a straight line pattern at equal intervals. 4. The uniformity of the lightness of the background image portion and the message image portion, which cannot be recognized by the naked eye provided in each line of the line drawing and / or the dot pattern and / or in each dot, and The different angles in the arrangement direction of the fine slit pattern structure having a constant fineness such that it is recognized as a printing area close to solid are from 30 degrees to 150 degrees.
4. The printed matter according to claim 1, wherein the printed matter is in a range of degrees. 5. The uniformity of the background image portion and the message image portion, which cannot be recognized by the naked eye provided in each line and / or dot pattern of each line drawing and / or each dot pattern, and has low brightness. 5. A gap width of a slit pattern structure having a constant fineness so as to be recognized as a printing area close to solid is a gap width of 40 to 100 microns. The printed matter whose authenticity can be determined. 6. The line width and / or dot pattern of the background image portion and the line width and / or dot pattern of the message image portion and / or the line width and / or dot pattern of both or any one of the line drawings and / or dot patterns 6. The printed matter of claim 1, 2, 3, 4, or 5, wherein an image having an arbitrary gradation is expressed by changing a dot system stepwise and / or continuously. . 7. The method according to claim 1, wherein the basic image is any one of a color pattern, a relief pattern, and a ground pattern, or a combination thereof.
The printed matter whose authenticity can be determined. 8. A method of authenticating the printed matter according to claim 2, wherein the printed matter is overlapped with the basic image and the light-reflective substrate, and the printed matter is tilted to determine the authenticity.