JPH11291609A - Intaglio latent image and forming method for the latent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form an intaglio printing element for providing the function of prevention for the forgery and alteration by a copier and forming an intaglio latent image to be observed only at the specified angle of a printed matter so as to improve the added value of a product, clarify the genuineness and prevent the forgery and alteration. SOLUTION: The height is provided for printing elements forming an aggregate pattern formed of curved printing elements and straight printing elements such as intaglio printing elements, and the printing elements on sections whereon latent images are not formed are formed of continuous lines 1 and 3, while sections whereon latent images are formed are formed of given cyclic zigzag printing elements 2 or of given cyclic wave type printing elements 4 formed of the elements of given shape in the basic curve and basic straight line directions. Also the printing element area of sections forming parts of the cyclic zigzag printing elements 2 or the cyclic wave type printing elements 4 on the sections whereon latent images are formed and corresponding to the one cycle constituted of the printing element sections and non-printing element sections continuing in the basic curve and basic straight line directions is equivalent to the printing element area of sections forming parts of continuous lines 3 and corresponding to the length same as that of one cycle in the basic curve and basic straight directions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intaglio printed matter which usually has a latent image which cannot be distinguished by the naked eye, and which is required to prevent forgery and falsification. The present invention relates to an intaglio latent image of an observed intaglio image and an intaglio latent image characterized by a copy preventing effect in which a latent image appears when the image is copied by a copying machine, and a method of forming the latent image.

[0002]

2. Description of the Related Art Intaglio printing is an important element in banknotes, stamps and various securities as a countermeasure against counterfeiting and alteration.
These counterfeiting and alteration prevention measures are mainly designed to use a design with diversified geometric patterns for design, and to produce latent images that could not be confirmed visually by adding some means and action to printed matter. There is a way. Typical examples of the former include tint block, colorful pattern, and relief pattern, which are widely used in the design of securities prints, and typical examples of the latter are intaglio latent images and colors normally reproduced by copying machines. There are functional inks, copy-proof images, etc. that are not applied. However, with the recent remarkable spread of color copying machines and the like, there is a danger that crimes caused by forgery and falsification will increase, and development of technology as a more effective countermeasure for forgery and falsification has been desired.

[0003] As a countermeasure for preventing forgery or falsification using the geometric pattern, there are a tint block, a color pattern, a relief pattern, and the like. The pattern is basically constituted by a set of curved lines with a constant line width. Things. These patterns, taking into account the design of the print, counterfeiting, countermeasures can be taken, making it difficult to produce the same pattern in the counterfeit by complicating the pattern, by photoengraving equipment The use of colors that are difficult to reproduce in an extraction or copying machine, or the formation of moire with respect to the scanning input / output of a copying machine and a scanner by forming a complicated music line, has increased the role as a countermeasure against forgery. In addition, the patterns are widely used in the design of securities prints and the like at the same time, and at the same time, they have been used for a long time as prints having a monetary value such as banknotes, stocks, bonds, and the like. It is an important pattern as a design that impresses, and when printing banknotes, stock certificates, securities such as bonds,
The color pattern, the relief pattern, and the like are indispensable in design. However, there is a drawback in that a recent forgery and alteration prevention effect has not been sufficiently brought about by the advent of highly sophisticated stencil making apparatuses or copying machines.

[0004] An intaglio latent image is known as a technique for developing a latent image that could not be visually confirmed by applying any means and action to the printed matter. As a typical example, there is Japanese Patent Publication No. 56-19273, and the present invention relates to a method of forming an image portion serving as a latent image on an intaglio-printed line with a high image, and a non-image printing of other intaglio-printed image. The line portion is constituted by an object lower than the object portion. For this reason, when the printed matter is tilted, the image portion is faster than the non-image portion, and the line interval is closed by the height of the image, and a latent image is developed. 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 difference in height 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 the uniform width of the image and the different directions. However, this method has a drawback that a place where a latent image is formed can be easily confirmed visually.

Japanese Unexamined Patent Publication No. Sho 60-155492 discloses that a square or rectangular group of parallel straight lines having two different heights is formed, and each adjacent group is alternately formed by two groups. This is a forgery-preventive pattern having at least two or more hidden images composed of objects in predetermined different directions. In this method, the image direction is changed for each group, and a height difference is provided between the image forming the hidden image and the straight line forming the background, but it is not possible to change only the height without changing the image width. , Very labor intensive. Also, the difference in the image direction can be easily confirmed with the naked eye. Also, when viewed from a certain direction and angle, there is a disadvantage that two or more hidden images overlap and are very difficult to see.

Further, there is a series of techniques called a copy prevention image as a method for causing a latent image which cannot be visually confirmed by adding any means and action to the printed matter. In a printed material suitable for preventing forgery by such a copying machine, a latent image displaying characters composed of fine structural elements, for example, 85 lines and 30% halftone dots, is printed on the base paper surface using silver ink, and then printed. In addition to this latent image, printing is performed with halftone dots coarser or denser than the latent image (for example, 150 lines 30%), and a printed pattern such as a color pattern or a ground pattern is formed on the upper surface of the latent image. There is a suitable printed matter containing a latent image (Japanese Patent Laid-Open No. 57-20395). Also, a latent image is printed on the surface of paper with halftone dots, a background having the same density as the latent image is printed simultaneously with a line, and the background is printed. By overprinting the decorative pattern on the upper surface of the latent image that contains the image with a thin transparent ink that is not reproducible by copying, the surface of the printed matter is finished well, and when copied, the pattern disappears, the background is reproduced and the latent is reproduced. The image is not reproduced, the background and There is a printed matter (Japanese Patent Application Laid-Open No. 60-79991) suitable for copy prevention, in which the difference in density becomes obvious and it can be seen at a glance that the printed matter is a copy. In addition, using a latent image plate having a background consisting of about 50 to 60 lines and 10% lines on a white ground around the latent image, performing dark printing on the surface of the paper and interfering with the background lines. By using an overprinting plate with a waveform pattern consisting of parallel lines that form a moiré pattern when printing, a single color overprint that is not reproduced by a copier is applied to the paper surface, and the moire that dazzles the naked eye on the surface of the printed matter Since the pattern is formed, the presence of the latent image becomes difficult to identify, and when the image is applied to a copying machine, only the background is reproduced without reproducing the latent image and the waveform pattern. Therefore, the latent image is recognized separately from the background. Prevent copying in printed matter Latent Kamufuraji method (JP 60-87380 JP) and the like have been disclosed.

In the printed materials disclosed in the above publications, a latent image is formed by the density of an image group (hereinafter, referred to as a screen pattern) in which halftone dots or lines are continuously arranged at a constant period, and a pattern on the entire printing surface is formed. Is a screen pattern having a uniform density. However, there is a disadvantage that the latent image can be identified by different screen patterns on the same printing surface even with the naked eye. As a method for solving this drawback, the method employs another pattern, a light-colored transparent ink, or a single-color overprint to camouflage the latent image, but the method does not make it difficult to identify the latent image. Although effective, it has the disadvantage of increasing the number of steps and not being economical.

[0008] Further, the musical composition line having periodicity and a musical composition line having periodicity generated by changing only the frequency among the coefficients in the trigonometric function are formed. There is a copy prevention object characterized in that the object occupancy is equal to the object occupancy of a music object whose only frequency has changed. However, in this object shape, a periodic object and a periodic object generated by changing only the frequency among the coefficients in the trigonometric function are:
Since the original pattern is changed without changing the amplitude, the change in the image shape can be easily confirmed visually.
Also, even if the amplitude is changed, the latent image can be easily visually inspected as long as the pattern is not smaller than a range of 100 μm which cannot be visually confirmed, due to a change in the pattern from the curved object having the original periodicity to the object shape. You can check. Including this latent image in a complicated pattern of a musical composition line is a very labor-intensive operation. Also, no one can easily know the trueness of the product.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and is intended to provide a curved image line and a straight line formed by three-dimensional objects on intaglio printed materials such as banknotes, stamps, and securities. By making the fixed image area of the image area and the non-image area equal to the collective pattern of the line, a latent image that can not be confirmed by ordinary visualization that does not require camouflage etc. is given, and counterfeiting and falsification by the copier While providing the function to prevent
It is an object of the present invention to provide an intaglio printing image having an added value of a product, clarification of the intent, and a higher anti-counterfeiting and alteration prevention effect by an intaglio latent image which can be confirmed from a specific angle.

[0010]

SUMMARY OF THE INVENTION The intaglio latent image forming method of the present invention is a method of forming an intaglio printing object composed of a curved object line and a straight line pattern, a continuous image of a portion where no latent image is applied, and a continuous line. The image of the portion on which the latent image is formed is constituted by a fixed-period image in which the objects having a predetermined shape are arranged at regular intervals in the basic curve direction and the basic straight line direction, Of the objects, the image area of a portion corresponding to one cycle consisting of an image portion and a non-image portion that are continuous in the basic curve direction and the basic straight line direction is the same as the basic line of the continuous line of the portion where the latent image is not applied. The image area of the portion corresponding to the same length as the one cycle in the curved direction and the basic straight line direction becomes equal.

Furthermore, the predetermined shape of the intaglio latent image of the present invention is
They are a fixed-period zigzag object and a fixed-period wave type object.

Further, the present invention is an intaglio printed material provided with the intaglio latent image of the present invention.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The intaglio printing object shape of the present invention is such that an object portion on which a latent image is not applied is a continuous line, and an object portion on which a latent image is applied is a fixed-period zigzag object or a fixed-periodic wave type. A fixed period zigzag object or a fixed-period wave type object composed of objects and a latent image is applied.One period consisting of an object part and a non-object part that are continuous in the basic curve direction and the basic linear direction. Since the image area of the portion corresponding to is equal to the image area of the portion corresponding to the same length as the one cycle in the basic straight line direction among the continuous lines of the portion where the latent image is not applied, In a normal state, the latent image cannot be visually identified.

Further, when a printed matter having the object configuration according to the present invention is copied by a copying machine, continuous lines of a portion where no latent image is formed are reproduced as it is from the resolution of the copying machine. Since the periodic zigzag object or the periodic wave type object is not reproduced, when a copy is observed with the naked eye, a density difference occurs between a portion where the latent image is not applied and a portion where the latent image is applied, and the latent image appears.

Further, when the intaglio printed material having the image configuration according to the present invention is viewed from a certain angle in the line direction, the image at the portion where no latent image is formed is such that the paper, which is the image interval, emerges. It looks white as a whole. On the other hand, with respect to the image of the portion where the latent image is applied, the image interval is closed by the height of the image from the image configuration in which the image in the vertical direction is mixed with the image of the portion where the latent image is not applied. Therefore, the image looks black as a whole, and there is a density difference between the image line of the portion where the latent image is not applied and the portion where the latent image is applied, and an intaglio latent image appears.

As described above, a function of preventing forgery and falsification by a copying machine is provided for an intaglio printing image in which a latent image cannot be confirmed by ordinary visual inspection, and an intaglio latent image observed only from a specific angle of a printed matter. The image makes it possible to enhance the added value of the product, clarify the meaning, and further enhance the resistance to forgery and alteration.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. As shown in FIGS. 1 and 2, the intaglio printing image of the present invention is obtained by changing the image of the portion where no latent image is applied to (1), (3),
(6) A continuous line as shown in (8) and an image of a portion on which a latent image is applied are converted into a periodic zigzag image and a periodic wave as in (2), (4), (5), and (7). It is composed of pattern objects.

FIG. 3 is an enlarged view of the boundary between the object line where the latent image is not applied and the object line where the latent image is applied, in order to show the object arrangement of the present invention in more detail. The image width in the direction perpendicular to the basic straight line of the continuous line in the portion where the latent image is not applied is (9), and the image width of the image portion of the periodic zigzag image in the portion where the latent image is applied is (10). And The object configuration according to the present invention corresponds to one period (16) consisting of an object part and a non-object part that are continuous in the basic curve direction and the basic straight line direction, among the fixed-period zigzag objects in the portion where the latent image is applied. Image area of part to be done (18)
Is the same length (1) as the one cycle in the basic curve direction and the basic straight line direction among the continuous lines of the portion where no latent image is applied.
Since the image area (19) of the portion corresponding to (7) is equal, the image width (9) of the continuous line of the portion where the latent image is not applied and the fixed period of the portion where the latent image is applied The object width (10) of the zigzag object is not equal (9/10). Further, the image areas (11) and (12) of the triangle formed between the extension lines in the basic curve direction and the basic straight line direction and the fixed-period zigzag image of the portion where the latent image is formed become equal (11 = 1).
2).

(Embodiment 1) A description will be given based on FIG. The latent image represented the letter E in a zigzag pattern at regular intervals. The size of the alphabet E is a character height of 15 mm. The interval (15) between continuous straight lines of the portion where no latent image is formed is set to 330 μm.

The continuous line of the object line in the portion where no latent image is formed has a height of 20 μm and an image line width (9) of 40 μm. In addition, the height of the periodic zigzag image of the portion where the latent image is applied is 12 μm or more.
17 μm, and the image width (10) was 24-34 μm. The amplitude (13) of the zigzag object was 50 μm, and the bottom (14) of one zigzag object where the zigzag object intersected the center line in the basic straight line direction was 56 μm. From the above, in order to make the constant area ratio composed of the fixed-period zigzag image of the portion where the latent image is applied equal to the constant area ratio of the continuous line of the image where the latent image is not applied, If the image area of the zigzag object in the portion where the latent image is applied is 70% of the image width of the continuous line of the object where the latent image is not applied, the area ratio becomes equal.
The intaglio printed matter was printed using the above-described configuration.

From the above results, the constant area ratio of the fixed-period zigzag image of the portion where the latent image is applied is equal to the constant area ratio of the continuous line of the image where the latent image is not applied. At an image width of about 30 μm, a latent image could not be visually recognized by visual observation of the printed matter. Also, in the copy by the color copying machine, moire occurred in the part where the latent image was not applied, and the periodic zigzag object in the part where the latent image was applied was not reproduced. The letter E in the alphabet was apparent, and it could be clearly identified as a copy. Furthermore, when the intaglio printed matter having the image configuration according to the present invention is viewed from a certain angle in the line direction, the image in the portion where the latent image is not applied has a shape such that the paper corresponding to the image interval is raised. The whole looks white. On the other hand, with respect to the image of the portion where the latent image is applied, the image interval is closed by the height of the image from the image configuration in which the image in the vertical direction is mixed with the image of the portion where the latent image is not applied. As a result, the image appeared black in its entirety, and there was a density difference between the image line in the portion where the latent image was not applied and the portion where the latent image was applied, and the appearance of the alphabet E as an intaglio latent image was obtained.

From the above, it can be seen that the constant image area ratio of the continuous line of the portion where the latent image is not formed and the constant image area ratio of the continuous line of the portion where the latent image is not formed, which constitutes the collective pattern of the curved image line and the straight line of the present invention. The constant area ratio composed of fixed-period zigzag objects is equal, and by equalizing the object area ratios in this way, it is not possible to identify latent images with the normal naked eye without using camouflage or the like. Making it possible.

[0023]

According to the present invention, as described above, the constant image area ratio of the continuous line of the image in the portion where the latent image is not applied and the constant period zigzag image in the portion where the latent image is applied are fixed. By making the area ratio equal, the latent image cannot be recognized by the naked eye at all.

Further, when the intaglio printed matter having the image configuration according to the present invention is copied by a copying machine, the continuous lines of the image where no latent image is formed are reproduced as they are or moire is generated, and the latent image is formed. Since the fixed-period zigzag image of the portion is not reproduced, when the copy is observed with the naked eye, a density difference occurs between the portion where the latent image is not applied and the portion where the latent image is applied, and the latent image appears.
The resolution by the copier is usually 400 dpi (one pixel is 64
μm), but it is possible to easily cope with higher resolution simply by changing the image width of the zigzag object at a constant period.

Further, when the intaglio printed matter having the object construction according to the present invention is viewed from a certain angle in the line direction, the object in the area where no latent image is formed is such that the paper, which is the object spacing, emerges. Therefore, the image area of the part where the latent image is applied is different from that of the area where the latent image is not applied because the vertical object is mixed with the object area where the latent image is not applied. Since the image is closed by the height, the image looks black as a whole, and there is a density difference between the image line in the portion where the latent image is not applied and the portion where the latent image is applied, so that an intaglio latent image appears.

As described in detail above, the present invention provides a banknote,
For intaglio printed materials such as stamps and various securities, a higher effect can be provided as a technology for improving the added value of products, clarifying the meaning, and preventing forgery and falsification.

[Brief description of the drawings]

FIG. 1 is a diagram showing a zigzag image configuration and a wavy image configuration of a portion where a latent image is provided and a portion where a latent image is not provided in a straight line.

FIG. 2 is a diagram showing a zigzag object configuration and a wavy object shape of a portion where a latent image is applied and a portion where no latent image is applied in a set pattern of a curved object.

FIG. 3 is an enlarged view of a boundary between a portion where a latent image is applied and a portion where a latent image is not applied;

FIG. 4 is an enlarged view of a portion where a latent image is applied.

FIG. 5 is a diagram illustrating a latent image E by a zigzag image with a fixed period.

[Description of Signs] 1, 3, 6, 8 A continuous line of a portion where a latent image is not applied 2, 5 A fixed period zigzag image of a portion where a latent image is applied 4, 7 A fixed period waveform type of a portion where a latent image is applied Object 9 Image width of continuous line in the area where no latent image is applied 10 Image width of fixed-period zigzag object in the area where latent image is applied 11 Extension of the outline of the continuous line in the area where no latent image is applied A triangle formed outside the line of the extension of the continuous line of the part where the latent image is not applied, and the extension of the outline of the continuous line of the part where the latent image is not applied. Triangle formed in the image of the extension of the continuous line of the part where the line and the latent image are applied and the continuous line of the part where the latent image is not applied 13 Height of the zigzag 14 1/2 of the base of the zigzag 15 Line interval between straight lines 16 Of the fixed-period zigzag lines on the latent image, the image A portion corresponding to one period including a line portion and a non-image portion 17 A portion corresponding to the same length as the one period (16) in the basic straight line direction among the continuous lines of the portion where no latent image is applied 18 (16) Image area of 19) Image area of (17)

Claims (3)

[Claims] 1. An intaglio printing object composed of a curved object line and a straight line pattern, wherein a continuous image is formed in a portion where a latent image is not applied, and a basic curve direction and a basic image are formed in a portion where a latent image is applied. In a straight line direction,
The object having a predetermined shape is composed of fixed-period objects arranged at regular intervals, and among the fixed-period objects of the portion where the latent image is applied, an image portion that is continuous in the basic curve direction and the basic straight line direction. The image area of a portion corresponding to one cycle of the non-image portion corresponds to the same length as the one cycle in the basic curve direction and the basic straight line direction among the continuous lines of the portion where the latent image is not applied. A method for producing an intaglio latent image, characterized in that the image areas of the portions become equal. 2. The intaglio latent image according to claim 1, wherein the predetermined shapes are a periodic zigzag object and a periodic wave type object. 3. The intaglio printed matter according to claim 1, wherein the intaglio latent image is provided.