JP2000313161A - Latent image pattern-formed body for preventing forgery and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a latent image pattern-body for preventing forgery which enables visualizing of a latent image varying each time an oblique observation angle is changed, although it is not recognized when observed from the front and determining of the genuineness in an extremely easy and certain manner especially without the use of a genuineness discriminating tool or the like. SOLUTION: A plurality of relief multilines 8 which have swollen cross sections and are of the same color as a base material having a projecting part 9 protruding to the side in the longitudinal direction, are formed on a base material and at the same time, a plurality of printed multilines 5 are formed along the relief multilines 8. Further, the projecting part 9 is formed of a plurality of stepped parts 11, 12, 13 formed protruding to the side in a staircaselike or a pyramidic shape. When an observation angle varies, the part of the printed multilines 5 which are shadowed by the relief multilines 8 cannot be recognized so that the part appears waned. Thus a varying latent image can be seen each time the observation angle is changed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to precious printed materials, such as banknotes, securities, passports, identification cards, cards, stamps, certificates, admission tickets, etc., which are required to prevent forgery and tampering. And a method of manufacturing the same.

[0002]

2. Description of the Related Art Valuable printed materials such as banknotes, securities, passports, identification cards, cards, stamps, certificates, admission tickets, etc., by their nature, are required to be resistant to forgery and tampering. As a preventive measure, there is known a technique in which a fine image configuration or the like is provided, and the authenticity is determined based on the presence / absence thereof.

[0003] However, since the fine image structure can be almost reproduced by a color copying machine, it is becoming difficult to determine the authenticity easily. In particular, with the recent improvement in the precision of electronic color copiers and scanners and their spread,
There is a risk that the valuable printed matter is easily duplicated and forged.

[0004] In such a technical background, the present applicant has formed a relief pattern having an uneven shape on a base material, printed a line pattern in a single color thereon, and provided a latent image thereon. An invention related to a forgery prevention latent image pattern forming body which has a gist of allowing the latent image to be recognized by observing the material at different angles and providing the authenticity discrimination has been already proposed (Japanese Patent No. 26000094). , Patent 26154
No. 01).

FIG. 1 is a plan view showing a main part of the conventional forgery preventing latent image pattern forming body 1 for explaining the principle thereof.
1C is a plan view, FIG. 1A is a cross-sectional view along AA, and FIG. 1B is a cross-sectional view along BB. In the conventional anti-counterfeiting latent image pattern forming body 1, the relief pattern on the base material 2 is continuously raised on the base material 2 by a constant width by embossing, intaglio printing, plowing, and the like. 1 (c of FIG. 1 (c), three of which are shown). Each of the relief lines 3 has a convex portion 4 protruding rightward (upward in the figure) along the longitudinal direction (X direction).
One or more (one convex portion 4 is shown in FIG. 1C) is formed along the longitudinal direction.

On the substrate 2 on which the relief lines 3 are formed, the printing lines 5 are respectively rightwardly directed in the X direction with respect to the relief lines 3 (upper in FIG. 1 (c)). Are printed in parallel along.

The operation of the conventional forgery-preventing latent image pattern forming body 1 having the above-described structure is as follows. When the conventional forgery prevention latent image pattern forming body 1 is observed from the front of the printing surface (from above substantially perpendicular to the printing surface), a plurality of (FIG. 1)
In FIG. 1 (c), all of the printed lines 5 (three lines in FIG. 1C) do not appear to be partially missing along the straight line, that is, FIG.
Observed as shown in (d).

As shown in FIGS. 1 (a) and 1 (b), the forgery-preventing latent image pattern forming body 1 is placed obliquely from the upper left side with respect to the surface of the substrate 2 with respect to the X direction and at an observation angle. α
When observing with (an angle with respect to the plane of the base material 2), the printed line 5 can be observed as shown in FIG. Due to the convex portion 4 of the relief line 3, the portion of the printing line 5 on the back side behind the relief line 3 is shaded and cannot be seen, and the other portions are visible. It can be recognized as shown in e).

FIG. 2 shows an example of a conventional forgery-preventing latent image pattern forming body 1, in which three rows of the convex portions 4 are formed along the X direction. When the anti-counterfeit latent image pattern forming body 1 is observed from the front side of the printing surface of the substrate 2, the printed lines 5 are all observed without being partially missing as shown in FIG. 1 (a) and (b), when the observation angle is changed between β and α and observed from two observation angles, a part of the printed line 5 is lost due to the shadow of the convex portion 4 and the printed line is lost. As for the lines, exactly the same three latent images 6 can be observed as shown in FIGS. 2 (b) and 2 (c).

[0010]

As described above, the conventional forgery preventing latent image pattern forming body 1 has a latent image which cannot be recognized even when viewed from the front, but can be recognized when viewed obliquely. Since only the same latent image can be observed even when the oblique observation angle is changed as described above, it is too simple in terms of forgery prevention, and there is still room for improvement.

Therefore, in the present invention, it is not possible to recognize even when observing from the front, but when obliquely observing the substrate at a plurality of different observation angles, different latent images corresponding to each observation angle can be recognized. A forgery-preventing latent image pattern forming body having a plurality of latent images, and a method of manufacturing the same, in which a complicated configuration is extremely difficult to forge and the determination thereof can be easily performed without using a determination tool or device. The task is to do so.

[0012]

According to the present invention, in order to solve the above problems, a relief pattern and a plurality of printed lines are formed on a substrate surface, and the relief pattern and the printing line are formed at an observation angle with respect to the substrate surface. A forgery-preventing latent image pattern forming body provided with a recognizable latent image only when viewed obliquely, wherein the relief pattern is formed from a number of relief lines in which a cross section of the same color as the base material is raised. Each of the relief lines is configured such that each of the relief lines extends in the longitudinal direction, and projects from the base line to one side with respect to the longitudinal direction.
It has a convex portion formed as described above, the convex portion is formed by a plurality of step portions having both side portions extending laterally with respect to the longitudinal direction and a top portion parallel to the base line portion. It is configured in a pyramid shape, and the printing lines are printed so as to extend in parallel along the relief lines, respectively, and a plurality of different observations corresponding to the number of the steps with respect to the substrate surface. Provided is a latent image pattern forming body for preventing forgery, characterized in that different observable images can be observed according to the observation angle when obliquely observed at an angle.

In order to solve the above-mentioned problems, the present invention forms a relief pattern and a plurality of printed lines on a substrate surface, so that when viewed obliquely at an observation angle with respect to the substrate surface. A method for producing a forgery-preventing latent image pattern forming body that imparts only a recognizable latent image, wherein the relief pattern is formed by providing a number of relief lines in which the cross section of the same color as the base material is raised. Each of the relief lines is formed by providing a base line extending in the longitudinal direction, and one or more protrusions protruding from the base line to one side in the longitudinal direction and formed along the longitudinal direction. , The convex portion is
A plurality of steps each having a side portion extending laterally with respect to the longitudinal direction and a top portion parallel to the base line portion are formed in a pyramid shape by coupling a plurality of steps, and the printing line and the relief line are formed. The lines are printed so as to extend in parallel with each other, and when obliquely observed at a plurality of different observation angles corresponding to the number of the steps with respect to the substrate surface, different latent images can be observed according to the observation angles. A method for producing a latent image pattern forming body for preventing forgery is provided.

The relief lines are formed by a technique such as intaglio printing, embossing or piercing.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a latent image pattern forming body for preventing forgery and a method of manufacturing the same according to the present invention will be described below with reference to the drawings based on examples. The anti-counterfeiting latent image pattern forming body 7 of the present invention is, for example, a valuable printed matter such as a security, passport, identification card, etc., and has a relief pattern formed on the base material 2. The configuration is such that a plurality of printing lines 5 are printed thereon. The base material 2 is paper,
It is formed from resin, fiber, or the like.

FIG. 3 shows an embodiment of the anti-counterfeit latent image pattern forming body 7 and the method of manufacturing the same according to the present invention.
FIG. 3 is a diagram mainly illustrating the principle by the structure of the main part. FIG. 3E is a plan view of a main part of the latent image pattern forming body 1 for preventing forgery, in which AA, BB, CC, and DD are shown.
The cross sections are shown in FIGS. 3 (a), (b), (c) and (d), respectively. The relief pattern is formed on the substrate 2 in the same manner as the conventional one.
A plurality of relief lines of the same color as the base material, which is continuously raised with a certain width by embossing, intaglio printing, piercing, etc.,
That is, it is composed of a plurality of relief lines 8 of the same color as the substrate formed in parallel at a constant pitch p. Each of the relief lines 8 is on the right side in the X direction (upper in FIG. 3E).
One or more convex portions 9 are formed along the longitudinal direction.

FIG. 3E shows a more specific structure of the relief lines 8. In this figure, for example, three relief lines 8 are shown, and each one of the projections 9 is shown. Have been. Each of the three relief lines 8 includes a base line 10 extending in the X direction and a convex portion 9 projecting rightward from the base line 10 in the X direction.

The convex portion 9 has a pyramid-like (step-like) contour in which a plurality of steps 11, 12, 13 projecting rightward from the base line in the X direction are connected.
The steps 11, 12, and 13 are respectively composed of both sides 14, 15, and 16 extending to the right with respect to the baseline 10, and tops 17, 18, and 19 extending in parallel to the baseline. The dimension w on both sides is designed as appropriate, but both are the same dimension, for example, 1
It may be 25 μm. The lengths of the tops 17, 18, and 19 are also appropriately designed. (In the example of FIG. 3E, the top side 1
7 and 18 are divided into left and right sides, but the top 19 is one. )

A plurality of printing lines 5 are printed on the substrate 2 on which the relief lines 8 having such a configuration are formed. The plurality of printed lines 5 are printed on the right side (upper in FIG. 3E) in the X direction along the relief lines 8 in parallel with the base line 10. In the above description, an example was described in which a printed line was printed on the substrate on which the relief line was formed first, but either the relief line or the printed line was formed on the substrate first. Needless to say, it is good.

The operation of the anti-counterfeit latent image pattern forming body 7 according to the present invention having the above configuration will be described. When the anti-counterfeit latent image pattern forming body 7 is observed from the front of the printing surface of the base material 2 (from above substantially perpendicular to the printing surface), the printed line 5 does not appear to be partially chipped. All,
That is, it is observed as shown in FIG.

Then, as shown in FIGS. 3 (a) to 3 (d), the forgery preventing latent image pattern forming body 7 is obliquely upward and leftward with respect to the printing surface thereof (in FIG. 3 (e), in the X direction). Observation is performed by obliquely changing the magnitude of the observation angle θ with respect to the substrate plane from angles (from the upper left side) with respect to the angles α, β, γ, and δ as described below. Here, α, β, γ, and δ are shown in FIGS.
As shown in (d), the step 13 of the relief line 8,
Observation angles, which are the limits at which the printed line 5 can be recognized beyond each of the lines 12 and 11 and the base line portion 10, and α>β>
γ> δ.

First, when observing at a position where the observation angle θ ≧ α, the printed line 5 is
It can be recognized as shown in FIG.

Next, when the observation angle θ is observed at a position where β ≦ θ <α, the base line 10 and the step 1
The part behind the steps 7 and 18 can be recognized, but the part behind the step 13 in the printed line 5 cannot be recognized due to the shade of the step 13. Therefore, the printing line 5 is recognized as shown in FIG.

Next, when the observation angle θ is observed at the position of γ ≦ θ <β, the portion behind the base line portion 10 and the step portion 17 can be recognized among the portions of the printing line 5, but the printing line 5 can be recognized. The part behind the steps 12 and 13 of the part is shaded by the steps 12 and 13 and cannot be recognized. Therefore, the printing line 5 is shown in FIG.
(G) is recognized.

Next, when the observation angle θ is observed at a position where δ ≦ θ <γ, the portion behind the base line portion 10 of the printed line 5 can be recognized, but the step of the printed line 5 can be recognized. Part 1
The portions behind 1, 12, 13 are the steps 11, 12, 13
I can not recognize it because of the shadow of. Therefore, the printing line 5 is recognized as shown in FIG.

Finally, by observing the forged prevention latent image pattern forming body 7 at an oblique observation angle θ with respect to the printing surface of the base material 2 as shown in FIGS. 3 (f) to 3 (h). In addition, the printing line can be recognized differently, whereby a plurality of different latent images that could not be recognized from the front can be recognized.
By appropriately designing the position, length, number of steps, and the like of the convex portions of the relief lines, specific different latent images can be provided to the forgery prevention latent image pattern forming body. By checking the presence / absence, shape, and the like of the latent image provided in this way, it is possible to easily and finely determine the authenticity.

FIG. 4 is a diagram showing the entire structure of the forgery preventing latent image pattern forming body of the present invention, and is a diagram showing a structure in which two rectangular latent images are provided as a very simple example. FIG.
(A) is an overall plan view of the forgery prevention latent image pattern forming body 20, in which a plurality of relief lines 23 of the same color as a base material having two convex portions 21 and 22 are formed in the longitudinal direction, and this relief is formed. This is a configuration in which a plurality of printing lines 5 are formed along the lines. The convex portion 21 has three steps, and the convex portion 22 has two steps. FIG. 4B shows a state where the relief line 23 and the printing line 5 are enlarged.

Although the latent image cannot be observed when the anti-counterfeiting latent image pattern forming body 20 is observed from the front, the observation angle is obliquely large (observation angle in FIG. 3F), medium (FIG. g) and small (observation angle in FIG. 3 (h)), when observed sequentially, as shown in FIGS. 4 (c), (d) and (e), the rectangular latent image 24, 24 ', 24 "and 25, 2
5 'and 25 "can be changed and recognized. Since the convex portion 21 is composed of three steps, the latent image 2 is changed every time the observation angle is changed.
4, 24 ′, 24 ″ can be recognized as having gradually changed into a rectangle having a large width. However, since the convex portion 22 is composed of two steps, the latent images 25, 25 ′ and latent images 25 It only changes to a two-width rectangle of the image 25 ".

The embodiment has been described based on the embodiments according to the present invention. However, the present invention is not limited to the above-described embodiments, and various embodiments may be made within the scope of the technical idea described in the claims. Needless to say, there is.

[0030]

According to the anti-counterfeiting latent image pattern forming body and the method of manufacturing the same according to the present invention, the latent image cannot be recognized when viewed from the front, but can be recognized when viewed obliquely. In addition, different latent images can be observed by changing the oblique observation angle, so that the presence or absence of a unique latent image for each observation angle makes it extremely easy and reliable without using a true / false discrimination tool. Enables true / false determination.

Even if a copy is made by a copying machine, the printed lines can be copied, but the relief lines cannot be three-dimensionally copied. Observation does not produce the effect of obstruction or the latent image being seen by the relief lines as in the present invention, and it is immediately determined that the image is forged.

Further, since the printed lines must be formed in a fixed and precise positional relationship with respect to the relief lines, it is extremely difficult to duplicate the image from this point, and forgery is not easy.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a structure of a main part of a conventional forgery prevention latent image pattern forming body.

FIG. 2 is a diagram illustrating the operation of a conventional forgery prevention latent image pattern forming body.

FIG. 3 is a diagram illustrating a main part of a forgery prevention latent image pattern forming body according to the present invention.

FIG. 4 is a diagram illustrating the overall configuration and operation of the forgery preventing latent image pattern forming body of the present invention.

[Explanation of symbols]

 2 Base material 5 Printed lines 7,20 Latent image pattern forming body for forgery prevention 8,23 Relief lines 9,21,22 Convex portion 10 Baseline portion 11,12,13 Step portion 14,15,16 Side portion 17, 18, 19 Top 24, 24 ', 24 ", 25, 25' 25" latent image

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H113 BA01 BA03 BA28 CA34 CA39 CA44 3E041 AA01 AA02 AA03 BA09 BA11 BB01 BC06 CA01 DB01

Claims (4)

[Claims] A relief pattern and a plurality of printed lines are formed on a substrate surface, and a latent image that can be recognized only when viewed obliquely at an observation angle with respect to the substrate surface is provided. The forgery prevention latent image pattern forming body, wherein the relief pattern is composed of a number of relief lines in which the cross section of the same color as the base material is raised, and each of the relief lines is in the longitudinal direction. The base portion extends, and has one or more convex portions protruding from the baseline portion to one side in the longitudinal direction and formed along the longitudinal direction, and the convex portions are lateral to the longitudinal direction. Are formed in a pyramid shape by connecting a plurality of steps each having a top portion parallel to the base line portion, and the printing line is parallel to each other along the relief line. It is printed so as to be stretched, and A forgery prevention latent image pattern forming body characterized in that different observable images can be observed according to the observation angle when obliquely observed at a plurality of different observation angles corresponding to the number. 2. The anti-counterfeit latent image pattern forming body according to claim 1, wherein the relief lines are formed by intaglio printing, embossing or piercing. 3. A forgery for forming a relief pattern and a plurality of printing lines on a substrate surface to provide a recognizable latent image only when obliquely viewed at an observation angle with respect to the substrate surface. A method for producing a latent image pattern forming body for prevention, wherein the relief pattern is formed by providing a number of relief lines in which a cross section of the same color as the base material is raised, and each of the relief lines is a longitudinal line. A base line portion extending in the direction, and protruding from the base line portion to one side with respect to the longitudinal direction, and formed by providing one or more convex portions along the longitudinal direction, and the convex portion is formed with respect to the longitudinal direction. A plurality of steps each having a side portion extending sideways and a top portion parallel to the base line portion are formed in a pyramid shape by connecting a plurality of steps, and the printing line and the relief line are parallel to each other. Print so that it extends to the base material surface And forming a latent image pattern for preventing forgery, wherein when obliquely observing at a plurality of different observation angles corresponding to the number of the step portions, different latent images can be observed according to the observation angle. How to make the body. 4. The method according to claim 3, wherein the relief lines are formed by intaglio printing, embossing or piercing.