JP2001130124A - Printed product having forgery preventive structure, method for discriminating it and discriminating implement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a line drawing and/or dot pattern printed product with a fine slit pattern structure for developing a specific warning message to an illegal copy utilizing an image input/output unit for a digital copier or the peripheral equipment of a personal computer and a discriminating screen capable of visualizing the message and easily discriminating a truth or a falsehood merely by superposing on the line drawing pattern printed product. SOLUTION: A fine slit pattern structure of a predetermined shape is executed in respective printing elements and/or dots of a line drawing and/or a dot pattern on a basic image A expressing the face image of a person by continuously changing the printing element width or the diameter of the line drawing and/or the dot pattern.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a line drawing and / or a dot pattern having a special minute slit pattern structure, in which a warning message appears when an illegal copy is made using a digital color copying machine or the like. It relates to a discrimination screen for authenticity discrimination.

[0002]

2. Description of the Related Art In recent years, forgery cases of illegal securities that exploit peripheral devices such as high-performance digital color copiers and personal computer scanners and printers have occurred frequently.
In order to suppress these incidents, in the world of halftone prints, a small halftone area in the print that exceeds the copying capacity of the copier is set in the print so as to function as a warning message at the time of copying. Various anti-counterfeiting techniques have been used. For banknotes and various securities prints,
Various line drawing patterns produced by a special method called a color pattern, a line pattern, and a copy-forgery-inhibited pattern have been widely used as forgery prevention technology. However, such special line prints are not sufficiently resistant to high performance digital color copiers, and the applicant has a special image structure for various line prints. And some forms have been proposed.

[0003] The present applicant has filed a method for preparing a copy-preventing pattern and a printed matter thereof (Japanese Patent Application Laid-Open Nos. Hei 8-197828, Hei 8-300800 and Japanese Patent Application No. Hei 10-300800).
365278), for a specific area constituting a colorful pattern, a line pattern, and a tint block pattern, which has been widely used in banknotes and securities, a "branch into two lines" for each individual image line. "," Disconnect line "," Branch into three ", design a fine image structure (form) that exceeds the copying ability of the copier, specific warning message for illegal copying Has been realized. However, in order to realize a fine image form on a printed material that exceeds the copying ability of a copying machine for a specific area in the individual image, it is necessary to use a plate film and a plate exposure and development condition. Advanced plate making on the order of microns, such as strict control of printing and thoroughly eliminating unstable elements such as thickening and fading of image lines during printing.
We needed printing technology. In addition, because the image is a fine image designed on the order of microns, the printing durability of the printing plate tends to be slightly inferior to that of a normal pattern printed matter, and a device for improving the printing durability is desired. Was.

The above prior art is a technique for forming a special structure (form) for a line drawing pattern such as a color pattern, a line pattern, a ground pattern, and the like. Therefore, a special screen method for expressing an array element constituting a dot pattern or a continuous tone image such as a photograph of a person by continuously changing the size of an array element such as a star-shaped figure or a small character. It was impossible to apply the conventional special structure (form) technique to the individual array elements.

Japanese Patent Application Laid-Open No. H10-100529 discloses a moire pattern when a pattern print is superimposed on a copy using a pattern print and a discriminator having a pattern that interferes with the pattern print. A method of discriminating a copy, which is characterized by discriminating the authenticity from the presence or absence of the copy, is disclosed. However, the printed matter is
It is premised on a regular pattern or the like which is a repetition of black equally-spaced stripes rising by 5 degrees, and it is difficult to express a meaningful image such as a mountain or a portrait only with the pattern. In addition, during the entire design of a voucher or the like, the pattern portion related to discrimination may unnecessarily protrude in design, so that it is differentiated from other general printed materials or the corporate image of the printed material issuer There is a risk that the sense of quality and weight in the design, which is regarded as important in improving the quality, may be lost. In addition, in the pattern portion related to the distinction that tends to protrude in design, there is a possibility that the correction of the illegally copied pattern portion by the counterfeiter's hand can be easily performed in a pinpoint manner.

As described in detail above, a warning message is generated for an illegal copy, and the warning message is skillfully added and modified, and a special copy or the like does not require a special mechanical device. In addition, it is possible to easily deliberate and discriminate, and it is also possible to use any curved line drawing such as a colorful pattern or relief pattern with a sense of luxury and weight required for valuable printed matter such as banknotes, etc. A special drawing form for a line drawing pattern or a dot pattern, to which the technology of the present invention can be applied without breaking the harmony of the overall design, is also desired for a dot pattern composed of array elements of a shape. .

[0007]

SUMMARY OF THE INVENTION The present invention does not require advanced plate making and printing techniques on the order of microns, and the number of printings on the plate is not inferior to that of ordinary printed matter. For illegal copying using a digital color copier or a peripheral device of a personal computer, which can cope with the above-mentioned characteristics without losing the above-mentioned characteristics, the image and / or the dot of the line drawing and / or the dot pattern constituting the basic image can be used. , A line image and / or a dot pattern with a minute slit pattern structure in which a specific warning message is expressed by applying a different arrangement direction of the slit pattern structures placed in the background image portion and the message image portion. It is a printed matter, and has a line pattern image having the same pitch as the slit pattern structure inserted in the printed matter. The object of the present invention is to realize a discriminating method and a discriminating screen capable of easily authenticating the authenticity by visualizing a warning message simply by superimposing a discriminating screen made of a base material such as a transparent film on the line drawing pattern print. I do.

[0008]

According to the present invention, a basic image comprising a line drawing and / or a dot pattern is provided on a base material, and the basic image includes a background image portion and at least one latent image. It is divided into a message image part with an image,
The angle in the arrangement direction of the minute slit pattern included in each image and / or dot of each of the line image and / or dot pattern divided as the background image portion, and the at least one or more latent images are applied. At least two or more slit structures in which the angle in the arrangement direction of the minute slit patterns in each image and / or each dot of the line image and / or dot pattern divided as the message image portion are different from each other The message image portion of the basic image is difficult to visually recognize, but the warning message is visually distinguished from the background image portion during copying.

Further, the printed matter has a forgery prevention structure, wherein the minute slit pattern structure is a straight line pattern at equal intervals.

[0010] Further, the slit width and the slit pitch of the minute slit pattern included in each image and / or each dot of the line image and / or dot pattern divided as the background image portion in the basic image, and the message The slit width and the slit pitch of the minute slit pattern included in each image and / or each dot of the line image and / or dot pattern divided as the image portion are respectively the same. This is a printed material having a forgery prevention structure.

Further, the printed matter has a forgery prevention structure, wherein the message image portion in the basic image is an image expressing characters and symbols.

[0012] Further, a printed material having a forgery prevention structure characterized in that an image having an arbitrary gradation is expressed by continuously changing the line width and the dot diameter of each of the line drawing and / or the dot pattern. is there.

Further, the printed matter has a forgery prevention structure, wherein the basic image is a tint block pattern.

Further, at least two or more micro slit pattern structures are straight line patterns, and the pitch thereof is 500 times the reciprocal of the resolution (DPI) of the image copying apparatus.
Printed matter having a forgery prevention structure of less than μm.

Further, the printed matter has a forgery prevention structure in which at least two or more micro slit pattern structures are straight line patterns and the pitches of which are both less than the reciprocal of the resolution (DPI) of the image copying apparatus × 2.

Further, a discriminating screen made of a base material such as a transparent film having an image of a line pattern having the same pitch as the fine slit pattern structure put in the printed matter is superimposed, and the discriminating screen is rotated. ,
A method of discriminating a printed matter having a forgery prevention structure, wherein at least one or more warning messages are sequentially displayed, and the printed matter and the copied matter are distinguished based on the presence or absence of the warning message.

Further, the discrimination screen having a line pattern having a pitch that interferes with an image of a line pattern having the same pitch as the fine slit pattern structure placed in the printed matter is a transparent film base for discriminating the authenticity of the printed matter. It is a discriminator made of a material.

Further, the arbitrary image expressed in the printed matter is a person image, and is a forgery characterized by a face image identification card in which specific ID information corresponding to the person is inserted as a message image. Printed matter having a prevention structure.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a printed matter having a forgery prevention structure according to the present invention will be described with reference to the drawings. The present invention arranges, on a base material, a basic image composed of a line image and / or a dot pattern, which is divided into a background image portion and a message image portion on which at least one or more latent images have been applied. The configuration is such that a minute slit pattern in which the arrangement direction or the width and the pitch are changed is provided in each image line and / or dot of each part.

When a printed matter having a forgery prevention structure according to the present invention is copied by a copying machine, a warning message which cannot be recognized in the original printed matter appears. Also, since the printed matter of the present invention depends on the copying direction of the copying machine, depending on the pitch of the minute slit pattern provided in each image and / or dot, a warning message may not appear even if the printed matter is copied. However, in such a case, a discriminating screen made of a base material such as a transparent film having a line pattern image having the same pitch as the slit pattern structure put in the printed matter is superimposed on the printed matter. Thus, the authenticity can be reliably determined.

As described above, by applying the minute slit pattern structure to the image of the line image and / or the dot pattern constituting the basic image, the forgery prevention effect is surely exerted. The present invention will be described below with reference to examples, including a manufacturing process.

[0022]

FIG. 1 shows a face image of a person by continuously changing the line width and / or diameter of a line drawing and / or a dot pattern, which is the basis for applying the micro slit pattern structure of the present invention. , The basic image A. Since the present invention is to provide a slit pattern structure within an image of a line drawing and / or a dot pattern and / or within a dot, a contour feature of a pattern of a line or a dot or a line or a dot in a basic image is provided. With respect to the positional characteristics, there is no inconvenience in the manufacturing method of the present invention and no inferiority in the effects of the present invention. Therefore, the image used for the basic image includes 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 in which minute characters are arrayed. And / or dot patterns are conceivable and are not limited to the present embodiment.

FIG. 2 is an image for a warning message that appears when copying by a copier or overlapping a discrimination screen, and is composed of characters "OK" and "COPY".

FIG. 3 shows a portion where the basic image A shown in FIG. 1 intersects with the warning message image shown in FIG. 2, and includes a message image portion B (OK) and a message image portion C (COPY). In the message image B, intersections are extracted in units of one dot.

FIG. 4 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.

The object of the present invention is to provide a small slit pattern structure in the line image and / or dot pattern image and / or the dot in the two message image portions B and C and the background image portion D, that is, a solid line image. And / or in a dot pattern image and / or a dot, a non-printed blank area having a slender shape with a gap width of about several tens to several hundreds of microns arranged regularly in the same direction is applied. Achieved by: As in this example,
When the basic image is an arbitrary gradation image represented by a change in image width or dot diameter, the size of the area where a minute slit pattern structure is formed in one image or one dot is It must be constant irrespective of the portion where the image width or dot diameter representing the shadow portion of the face image is large and the portion where the image line width or dot diameter representing the highlight portion of the person is small. 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 portions B and C and the background image portion D, the arrangement directions of the minute slit pattern structures 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 254 microns, and the slit width is approximately 127 microns (at this time, the image line width is approximately 127 microns). ), The message image portion B (OK)
90 degrees, 45 degrees for the message image portion C (COPY), and 0 degrees for the background image portion D, and a fine slit pattern structure was provided for the basic image A. FIG. 5 is a schematic diagram of the line drawing and / or dot pattern with the fine slit pattern structure obtained at this time.

FIG. 6 is an enlarged view of the vicinity E of the message image portion B (OK) containing the minute slit pattern structure and the background image portion D. FIG. 6 shows the message image portion C (COPY) and the background image portion containing the minute slit pattern structure. FIG. 7 is an enlarged view of the vicinity F of the boundary of D.

As can be understood from the enlarged views of FIGS. 6 and 7, the minute slit pattern structure in the background image portion and the message image portion differs only in the arrangement direction in both regions. And there is no density difference in both areas of the message image part.
Therefore, as long as a normal original print is observed, the warning message is not exposed. Furthermore, even a 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, the localization obtained with the magnifying glass cannot With such information, it is extremely difficult to restore the whole image of the warning message.

Based on the obtained line drawing and / or dot pattern with a fine slit pattern structure, a plate making film was prepared using a commercially available laser plotter, and then a plate was prepared using a commercially available positive type PS plate. Using the obtained printing plate, on a high-quality commercial paper, using a commercially available offset ink (light reddish purple), the adjustment of the printing equipment is the same as ordinary lithographic offset printing, and offset printing is performed without special adjustment. I got

FIG. 8 shows a copy obtained by copying the obtained print in a map mode using a digital color copier (Limos 2. CF900) manufactured by Minolta.
"O" which could not be recognized in the original printed matter
A warning message consisting of the letters "K" and "COPY"
It clearly appeared in the copy. The appearance of the warning message depends on the copying (scanning) direction of the copier.

On the other hand, the pitch of the straight line pattern of the plurality of slit structures is the same as the resolution (DP) of the image copying apparatus.
For line prints and / or dot pattern prints with a micro-slit pattern structure less than the reciprocal of I) x 2 (127 microns), the copy will not show a warning message. In such a case, the authenticity can be reliably determined by overlapping the determination screens.

Next, assuming that the moving direction of the reading unit in the copying machine is 0 degrees, the left-right direction of the original printed material placed face down on the glass surface of the copying machine is rotated counterclockwise to warn the user. The message "OK" and "CO
The expression of "PY" was tested, and the results are shown in FIG. The clockwise rotation amount is shown in the angle column of FIG.

In the results of the experiment shown in FIG. 9, a symbol indicates that a warning message clearly appears, a symbol indicates that a warning message can be identified, but not clearly, and a symbol indicates that a warning message is hardly understood or cannot be identified at all. ×, the visual evaluation was performed in three steps.

It can be seen that the angle at which the warning message appears has a certain range, and the message image B
Does not appear when the horizontal direction of the printed matter with respect to the copying direction of the copier is between 40 degrees and 50 degrees. For message image part C,
It was found that no warning message appeared when the left and right directions of the printed matter with respect to the copying direction of the copying machine were around 30 degrees and 70 degrees.

Therefore, by arranging the slits in different directions in a plurality of message image portions, a printed matter that always produces a warning message regardless of the angle of copying is designed. can do. Also, by designing a plurality of background image portions for a single message image portion and arranging the slits in the background image in different arrangement directions, a printed matter having the same effect as above can be obtained. Can be realized.

The appearance of the warning message is caused by a difference in reproducibility between the message image portion and the background image portion due to interference with a screen having a specific number of lines at the time of image input / output in the digital copier. As a warning message that can be perceived by the observer, the warning message is differentiated from the background image part and appears. Therefore, the size of the slit width, that is, the image line width does not affect the appropriateness of the warning message. Therefore, there is no problem even if the actual slit width fluctuates from the value of the slit width described in the present embodiment due to an unstable factor in the plate making and printing processes. It goes without saying that the pitch of the slit designed in the image design stage is not changed by the above-mentioned instability factor.

When the slit width is large, the image line width is inevitably small, and the color tone of the entire printed matter is light. Therefore, the printed pattern is suitable for use as a background image such as a tint block pattern or a relief pattern in a valuable printed matter.

Next, nine types of samples having different pitches of the fine slit pattern structure and different slit widths were prepared.
As shown in this example, slits having various design values as shown in FIG. 10 can be obtained only by reducing or enlarging the entire printed matter shown in FIG. The design value of the design of FIG. 5 is set to 100%, and the size is enlarged by 10%.
A total of 9 levels of printing symbols from 30% to 110% are obtained by reducing the size, and after the same printing method as described above,
Nine levels of printed matter were obtained. The obtained printed matter was subjected to a copying experiment using three digital color copiers manufactured by Minolta (Limos 2. CF900), Canon (CLC900), and Ricoh (imagio 4055). Figure 11 shows the experimental results.
Shown in

As described above, the slit width (image line width)
Does not affect the suitability of the warning message to be expressed, so the design value may be rough. In the present example, as a rough guide, the ratio between the image width (image portion) and the slit width (non-image portion) is designed to be 1: 1. Based on this design ratio, the image line width is about 38 microns even at the level 1 where the finest design is required. This value can be easily printed by a known method without undergoing fluctuation such as thickening or blurring of the image due to an unstable factor in the plate making and printing processes.

Based on the copy result shown in FIG.
In copying with a copy machine other than C900), a good warning message was obtained. It is confirmed that the effective slit design value is wide. The effect of the warning message on Ricoh's (IMAGIO4055) is more extensive on the finer level than on Minolta's (Limos 2. CF900). Because it is higher than the machine. Level 4 due to high resolution and excellent reproducibility of details (slit structure)
A warning message also appears for the printed matter.

The minute slit structure formed in each dot and each wavy line in a printed matter whose original size is 50% or less (level 3) is copied as a uniform halftone solid area where the slit cannot be reproduced. Have been. Therefore, the warning message does not appear. However, in such a case, by judging the discrimination screen proposed in the present invention, the authenticity can be surely discriminated.

The discrimination screen proposed in the present invention has an image of a line pattern having the same pitch as the pitch of the fine slit structure formed in the printed matter on a base material such as a transparent film. More specifically, it has an image of a straight line pattern with a pitch of 127 microns and an image line width of 64 microns. In a copy in which the minute slit pattern structure is not reproduced, when the discrimination screen is superimposed, no interference can occur, so that a warning message does not appear and it can be determined that the copy is a counterfeit. By using a discriminating magnifier or the like, if the presence or absence of the micro slit pattern structure in the copy is inspected, the authenticity can be determined. , Can be easily and reliably determined.

FIG. 12 shows the warning message K visualized by superimposing the discrimination screen H on the printed matter G of level 3 whose original size is 50%. The discrimination screen has an image of a line pattern having the same pitch as the pitch of the fine slit structure provided in the printed matter on a base material such as a transparent film, and specifically, the pitch is 127 microns. Has an image of a straight line pattern having an image width of about 64 microns. In this example, a photosensitive photographic film was used as a base material of the discrimination screen. If it is desired to avoid confusion of the printed image due to the superposition of the straight line patterns on the discrimination screen, an uneven groove pattern may be formed on the transparent screen substrate.

In the case of a line drawing and / or dot pattern having a fine slit pattern structure with a pitch of 120 microns or less and a slit width of about 60 microns, a specific ID corresponding to the basic image is used instead of a warning message. The information or the like may be turned into a latent image. In this case, the pitch of the slit,
Even if a fake micro-slit structure whose width and angle are not the same as the original printed matter is inserted, specific and true ID information for the basic image is not expressed by the discrimination screen, so it is cost effective and effective and reliable. A line drawing and / or a dot pattern having cryptographic ID information can be realized.

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

As described above, the present invention has been described based on the embodiments. However, the present invention is not limited to the embodiments, and may be made within the technical scope described in the claims.
It goes without saying that various other embodiments are conceivable.

[0048]

The image line width used in the printed material of the present invention, even if used in the minimum level, is twice or three times as large as that of the prior art. Therefore, a printed matter can be easily produced even if some instability factors are involved in the plate making and printing processes. Further, the printing durability of the printing plate is not inferior to that of ordinary printed matter, so that printing can be advantageously performed in terms of cost. Also,
Since the image line width used in the present invention is at least about 40 microns and at most about 120 microns, it is difficult to print gold or silver ink having a relatively large pigment particle diameter, which is considered difficult to print. It is also suitable for printing as a color ink.

The effect of developing a latent image in the printed matter of the present invention is remarkable. Although the mode of development depends on the input / output scanning direction in the copier, a warning message easily appeared in the digital color copier at the highest resolution level. Further, according to the present invention, with respect to the risk of forgery accompanying the improvement in copy performance expected in the future,
By making the pitch and the slit width of the fine slit pattern structure finer, it is possible to cope quickly. Even if a digital color copier having the highest resolution twice as high as the current one appears, the pitch and width of the slits should be reduced to the design values of the 50% size level (pitch 127 microns, width 63.5 microns). ) Can be easily dealt with.

At a level of about 50% or less, a warning message does not appear when output as a copy because the minute slit pattern structure exceeds the input resolution of the image input device. However, line images and dots on a copy having no minute slit pattern structure cannot interfere with the discrimination screen. Therefore, a warning message does not appear when the discrimination screens are superimposed, and it is possible to easily determine that the discrimination is forgery.

In the range of the design value of the fine slit pattern structure at the level of 100% or less, ID information (hidden information) for identifying the basic image is adopted instead of the warning message. The effects of the invention are further exhibited. If this method is adopted for an identification card containing a face image such that the basic image is a face image, the date of birth or password of the person can be hidden through a minute slit pattern structure. The effect of preventing forgery against replacement of a superficial face image is high.

The present invention can be achieved by applying a minute slit pattern structure to an existing line drawing and / or dot pattern image called a basic image. Therefore, the line drawing designer does not consider the warning message at the time of copying, the warning message that appears when the discrimination screen is superimposed, and the appearance of hidden information, and there is no special restriction on the designer's design. In addition, any person who does not have design knowledge can create a forgery-prevention printed matter, and the work can be shared. In addition, it is possible to easily create a line drawing design that has an anti-counterfeiting effect by applying a minute slit pattern structure to line drawings and dot pattern designs that are already stored in a database and saved. Excellent in nature.

In addition, the above-described method for preparing a copy-preventing pattern and its printed matter (Japanese Patent Application Laid-Open No. 8-197828,
-300800 and Japanese Patent Application No. 10-365278).
In this case, it is necessary to make the image area equal between the continuous line of the portion where the latent image is to be applied and the continuous line of the portion where the latent image is not to be applied, so that it takes time to calculate and edit the design value of the image. On the other hand, according to the present invention, as described above, an editing operation is easy because only a minute slit pattern structure is applied to an existing object or a newly designed object.

Also, only by changing the size of the entire design including the minute slit pattern structure based on the same design, one is to cause a warning message to appear during copying,
On the other hand, it is possible to easily select and create two different forgery-prevention prints in which ID information using the determination screen is hidden.

[Brief description of the drawings]

FIG. 1 shows a basic image A on which a minute slit pattern structure is applied according to the present invention.

FIG. 2 shows an image for a warning message that appears when a copying machine or a discrimination screen is superimposed on a copy machine.

3 shows a portion where the basic image A in FIG. 1 intersects with the warning message image in FIG. 2;

FIG. 4 shows a basic image A to a message image B (O
K) and an image of a part excluding the message image part C (COPY), showing the background image part D.

FIG. 5 is a line drawing with a minute slit pattern structure and / or
Alternatively, a schematic diagram of a dot pattern is shown.

FIG. 6 shows an enlarged view E near a boundary between a message image portion B (OK) having a minute slit pattern structure and a background image portion D.

FIG. 7 shows an enlarged view F near a boundary between a message image portion C (COPY) having a minute slit pattern structure and a background image portion D.

FIG. 8 shows a sample image of a copy.

FIG. 9 shows a visual evaluation of the degree of latent image development with a change in the scanning angle of the copying machine.

FIG. 10 shows design values of each level whose size has been changed.

FIG. 11 shows copy results of three types of copiers.

FIG. 12 shows a method for visualizing a warning message by superimposing discrimination screens.

[Explanation of symbols]

 A Basic image B Message image B C Message image C D Background image area D E Near the boundary between message image B and background image area F Near the boundary between message image C and background image area G Printed matter H Film J Straight line pattern K Warning message

Continued on the front page (72) Inventor Hiroki Onozuka 6-30-202 Sakari, Odawara-shi, Kanagawa F-term (reference) 2H113 AA04 AA06 BA05 BB02 BB22 CA39 CA40 CA44 FA56

Claims (11)

[Claims] 1. A base image having a basic image composed of a line drawing and / or a dot pattern on a base material, wherein the basic image includes a background image portion and a message image portion provided with at least one latent image. And the angle in the arrangement direction of the minute slit patterns included in each image and / or dot of the line image and / or dot pattern divided as the background image portion, and the at least one latent image At least two or more angles in the arrangement direction of the minute slit patterns included in each image line and / or each dot of the line image and / or the dot pattern divided as a message image portion on which an image is applied. Although the message image portion of the basic image is difficult to visually recognize, the warning message is visually distinguished from the background image portion during copying. Printed matter having a forgery prevention structure. 2. The printed matter having a forgery prevention structure according to claim 1, wherein the fine slit pattern structure is a straight line pattern at equal intervals. 3. A slit width and a slit pitch of a minute slit pattern included in each image and / or each dot of a line image and / or a dot pattern classified as a background image portion in the basic image; The slit width and the slit pitch of the minute slit pattern included in each image and / or each dot of the line image and / or the dot pattern classified as the message image portion are respectively the same. Claim 1
Or a printed matter having the forgery prevention structure according to 2. 4. The printed matter having a forgery prevention structure according to claim 1, wherein the message image part in the basic image is an image expressing characters and symbols. 5. An image having an arbitrary gradation is represented by continuously changing a line width and a dot diameter of each of the line drawing and / or the dot pattern.
A printed matter having the forgery prevention structure according to 2, 3, or 4. 6. The printed matter having a forgery prevention structure according to claim 1, wherein the basic image is a tint block pattern. 7. The at least two or more micro slit pattern structures are straight line patterns, the pitch of which is the reciprocal of the resolution (DPI) of the image copying apparatus × 2 or more and 50 or more.
The printed matter having a forgery prevention structure according to claim 4, 5 or 6, which is less than 0 µm. 8. The image forming apparatus according to claim 4, wherein the at least two or more fine slit pattern structures are straight line patterns, and the pitches thereof are both less than the reciprocal of the resolution (DPI) of the image copying apparatus × 2. Printed matter having a forgery prevention structure. 9. A discrimination screen made of a base material such as a transparent film having an image of a parallel line pattern having the same pitch as the fine slit pattern structure placed in the printed matter is superimposed on the printed matter according to claim 8, A method of discriminating a printed matter having a forgery prevention structure, characterized in that at least one or more warning messages are sequentially expressed by rotating the discriminating screen, and the printed matter and the copied matter are distinguished based on the presence or absence of the warning message. . 10. The discrimination screen having a line pattern having a pitch that interferes with an image of a line pattern having the same pitch as the minute slit pattern structure contained in the printed matter according to claim 8, wherein the authenticity of the printed matter is determined. A discriminator made of a transparent film substrate for discriminating. 11. An arbitrary image represented in the printed matter according to claim 8 is a person image, and is an identification card with a face image including specific ID information corresponding to the person as a message image. Printed matter having a forgery prevention structure characterized by the following.