JP2019045791A - Anti-counterfeiting medium, method for producing the same, and method for displaying dot pattern - Google Patents

Abstract

To provide an anti-counterfeiting medium which can perform anti-counterfeiting judgment by providing a normally invisible latent image pattern different in appearance from a normal hologram, and thereby improving the anti-counterfeiting effect.SOLUTION: An anti-counterfeiting medium includes an array pattern 3 in which a dot pattern A1 composed of: a core dot α11 formed by an embossing and emitting directional scattering light in a first direction with respect to incident light; and a peripheral dot α12 formed by embossing and adjacent to a core dot α and having an equal area and emitting directional scattering light in a second direction, and a dot pattern B2 composed of: a core dot β22 formed by embossing and emitting directional scattering light in a second direction; and a peripheral dot β 21 formed by embossing and adjacent to the core dot β and having an equal area and emitting directional scattering light in the first direction, the dot pattern A1 and the dot pattern B2 being arranged at equal pitches. In the array pattern, the dot patterns A and dot patterns B are arrayed to form letters or symbols.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an anti-counterfeit display body such as an authenticity determination label that proves that a product is genuine, by printing variable information and variable latent image information on a diffraction grating pattern such as a hologram, The present invention relates to an anti-counterfeit display body having a higher anti-counterfeit effect and a method for manufacturing the same.

  Conventionally, as a means for preventing counterfeiting of products, for example, it is difficult to imitate the product itself, or it is genuine by attaching something difficult to imitate to the product as evidence that it is genuine. There was a means to be able to distinguish fake. Typical examples of the latter include anti-counterfeiting means using optical devices such as relief holograms, diffraction gratings, and Lippmann holograms, which have been widely used in recent years.

  For example, a relief type hologram is formed by forming interference fringes with fine irregularities, and a unique color shift (color change of reflected light) occurs depending on the angle at which the hologram is viewed, due to diffraction and interference of light caused by the interference fringes. Is. By using such an optical device as an anti-counterfeiting means and confirming the presence or absence of a color shift in that portion, it is possible to easily determine whether or not the product is a genuine product, and authenticity can be easily confirmed.

  However, recently, optical devices such as those described above are becoming more easily counterfeited because of the simple hologram principle and the structure of the layers constituting the hologram, and the effect of preventing forgery is diminishing. As a countermeasure, individual information such as serial numbers can be given to various labels provided with diffraction grating patterns such as holograms to be attached to products, etc. for label authenticity confirmation and label management. As a method for these printing, the ink layer is transferred onto the label using a thermal transfer ribbon, the foil is transferred using a transfer foil, or a thermosensitive coloring layer is provided on the label. There was a method of color printing.

  In addition, there is a method in which an aluminum vapor deposition layer provided for more effectively showing a diffraction grating pattern such as a hologram is printed by skipping the aluminum vapor deposition layer with a laser printing apparatus such as a YAG laser (Patent Document 1). However, printing by each of the above methods only forms a record in a single color, making it difficult to distinguish from other methods and forgery or tampering, and has a limited anti-counterfeit effect. .

  A method of printing individual information using a diffraction grating such as a hologram as a transfer foil as a thermal transfer foil has also been proposed (Patent Document 2), but the acquisition of a general hologram transfer foil has become relatively easy. Therefore, the anti-counterfeiting effect is still limited.

  Further, Patent Document 3 includes a first region that displays a color corresponding to directional scattered light when irradiated with white light, and a second region that displays a color caused by a print layer, and an incident angle of white light. Thus, the display area can obtain the effect of preventing forgery by making the latent image visible or invisible so that the first area and the second area display the same color or different colors. Is disclosed.

  However, in the display disclosed in Patent Document 3, the latent image can be easily seen by changing the angle of incident light or changing the viewing angle, so that the forgery prevention means is provided. Is easy to understand, and sometimes it can easily trigger counterfeiting, and its anti-counterfeiting effect is limited.

JP-A-10-333574 JP 2000-263910 A Japanese Patent No. 5793852

  The present invention has been made to solve the above-described problems of the prior art, and by performing number printing using a diffraction grating using directional scattered light by a thermal transfer foil, it looks different from a normal hologram. In addition, a latent image pattern that cannot be visually recognized by a normal dot is provided by a fine dot that combines two types of diffraction gratings using directional scattered light, and this can be visually recognized by a special lens array. It is an object to provide an anti-counterfeit medium capable of performing the anti-counterfeit judgment by performing the verification of the image and improving the anti-counterfeit effect by making it difficult to know that the latent image is provided. And

In order to solve the above problems, the invention according to claim 1 of the present invention provides:
In part of the diffraction grating pattern such as a hologram,
A nuclear dot α formed by embossing that emits directional scattered light in a first direction, and adjacent to the nuclear dot α, has an area equal to the nuclear dot α, and directional scattered light in a second direction. Dot pattern A consisting of peripheral dots α formed by embossing
A nuclear dot β formed by embossing that emits directional scattered light in the second direction, and a directional scattered light in the first direction adjacent to the nuclear dot β and having the same area as the nuclear dot β. Dot pattern B consisting of peripheral dots β formed by embossing
An arrangement pattern arranged at an equal pitch is provided,
The array pattern is an anti-counterfeit medium in which the dot pattern A and the dot pattern B are arrayed so as to form characters or symbols.

The invention according to claim 2
In part of the diffraction grating pattern such as the hologram, with respect to incident light,
A character or symbol formed by embossing that emits directional scattered light is described, and a part or all of the character or symbol emits directional scattered light in the first direction or the second. The anti-counterfeit medium according to claim 1, wherein the medium is expressed by embossing that emits directional scattered light in the direction of.

The invention according to claim 3
Characters or symbols formed with the dot pattern A, the dot pattern B, and an emboss that emits the directional scattered light are directed in the first direction on a forgery prevention medium on which a diffraction grating pattern such as a hologram is formed. The transfer layer of the thermal transfer ribbon in which the embossing that emits the directional scattered light is formed on the transfer layer and the transfer layer of the thermal transfer ribbon in which the emboss that emits the directional scattered light in the second direction is formed on the transfer layer are provided. Is a method for producing a forgery prevention medium.

The invention according to claim 4
A lens array in which convex lenses are arranged at the same pitch as the dot pattern A and the dot pattern B are arranged in the arrangement pattern on the anti-counterfeit medium according to claim 1 or 2, and the dots The dot pattern display method is characterized in that only the core dots α or the core dots β of the pattern A and the dot pattern B are displayed.

  According to the first aspect of the present invention, two types of dot patterns in which dots of equal area that emit directional scattered light in different directions are combined are appropriately arranged on a part of a diffraction grating pattern such as a hologram. With normal visual inspection, the two types of dot patterns cannot be distinguished, and the characters and symbols formed in the dot patterns can be recorded so as to be in a latent image state, and the characters and symbols are recorded as secret information. An anti-counterfeit medium that can be used can be provided.

  Further, according to the invention described in claim 2, it is impossible to reproduce a general diffraction grating pattern by writing characters and symbols on an emboss pattern that emits directional scattered light on a part of a diffraction grating pattern such as a hologram. When the anti-counterfeit medium is viewed from an angle, the anti-counterfeit medium can be provided in which the letters and symbols appear as a bright pattern and when rotated 90 °, the anti-counterfeit medium appears as a dark pattern.

  According to the invention described in claim 3, the two types of dot patterns are divided into a thermal transfer ribbon in which an emboss that emits directional scattered light in the first direction is formed in the transfer layer, and directional scattering in the second direction. Embosses for emitting light can be formed by thermal transfer from the thermal transfer ribbon formed on the transfer layer, and a dot pattern in which different characters and symbols are recorded as latent images for each medium can be formed.

  According to the fourth aspect of the present invention, characters and symbols recorded as latent images in the dot pattern are displayed in a manner that can be easily confirmed visually by enlarging and displaying only the nucleus dot portion with the lens array. It becomes possible.

It is a schematic diagram of two types of dot patterns. It is explanatory drawing of the light-scattering ability of two types of dot patterns. It is explanatory drawing of the difference by the direction of the light-scattering ability of two types of dot patterns. It is a schematic diagram of the arrangement | sequence which formed the latent image with two types of dot patterns. It is a schematic diagram of an example of diffraction grating patterns, such as a hologram. It is the schematic diagram which overlapped the dot pattern arrangement | sequence and the character on diffraction grating patterns, such as a hologram. It is a schematic diagram of a lens array. It is sectional drawing of a lens array. It is a schematic diagram of the state displayed so that a latent image could be visually observed with a lens array. It is a schematic diagram of the state which displayed the latent image from the different angle by the lens array.

  Hereinafter, embodiments of the present invention will be described in detail.

  FIG. 1 is a schematic diagram of two types of dot patterns provided in the anti-counterfeit medium of the present invention. In FIG. 1, a nuclear dot α11 formed by embossing that emits directional scattered light in a first direction, and a nuclear dot α11. A dot pattern A1 composed of peripheral dots α12 that are adjacent to each other and have the same area as the nucleus dot α11 and emit directional scattered light in the second direction, and directional scattered light in the second direction. And the peripheral dot β21 formed by embossing that emits directional scattered light in the first direction adjacent to the nuclear dot β22 and having the same area as the nuclear dot β22. Each dot pattern B2 is shown.

The dot pattern A1 and the dot pattern B2 shown in FIG. 1 have a configuration in which two types of embossed dots that emit directional scattered light are combined. Embosses that emit directional scattered light are straight lines. And includes a plurality of concave portions or convex portions whose directions are aligned in the plane. By changing the interval and depth or height of the concave portions and the convex portions, it looks brighter in the direction of light. Or it looks dark.

  The directional scattered light will be further described. In the dot pattern A1 illustrated in FIG. 1, the core dot α11 configured by embossing that emits directional scattered light in the first direction has a plurality of concave portions or convex portions formed side by side in the Y direction. The peripheral dot α12 formed by embossing that emits directional scattered light in the direction 2 is formed with a plurality of concave portions or convex portions side by side in the X direction. At this time, the nucleus dot α11 shows the minimum light scattering ability in the Y direction and shows the maximum light scattering ability in the X direction. On the other hand, the peripheral dot α12 shows the minimum light scattering ability in the X direction and the maximum light scattering ability in the Y direction.

  Therefore, when incident light is incident on the dot pattern A1 and the dot pattern B2 obliquely from the direction indicated by the arrow A in FIG. 2, the directional scattered light is emitted in the first direction in the dot pattern A1 as shown in FIG. The core dot α11 composed of the embossing emitted is dark with the minimum light scattering ability, and the peripheral dot α12 composed of the embossing emitting the directional scattered light in the second direction has the maximum light scattering ability. When it looks bright and is rotated 90 ° to the left or right in the plane, the light scattering ability is reversed, so the light and darkness is reversed as shown in FIG. 3 (rotated 90 ° to the right). Looks. The dot pattern B2 is also a pattern in which the brightness is reversed with respect to the dot pattern A1, but the appearance is similarly reversed.

  At this time, the core dot α11 composed of embossing that emits directional scattered light in the first direction and the peripheral dot α12 composed of embossing that emits directional scattered light in the second direction have respective areas. The same. For this reason, when the areas of the dot pattern A1 and the dot pattern B2 are sufficiently small, it is difficult to distinguish between the core dots and the peripheral dots. Here, the area is sufficiently small means that the length of one side is 0.5 mm or less, preferably 0.2 mm or less.

  FIG. 4 shows an example of a dot pattern array 3 in which the dot pattern A1 and the dot pattern B2 are combined and arranged at an equal pitch to form letters, numbers, symbols, and the like. In FIG. 4, the character pattern “123” is formed by the dot pattern A1 with the dot pattern B2 as “ground”. FIG. 6 shows a pattern 5 in which the dot pattern array 3 is provided on a diffraction grating pattern such as a hologram having a pattern as shown in FIG. In FIG. 6, on the diffraction grating pattern 4 such as a hologram, a numeral 53 composed of embosses for emitting directional scattered light together with the dot pattern array 3 is also provided.

  In FIG. 6, the dot pattern array 3 is shown large for easy understanding. However, when the dot pattern A1 and the dot pattern B2 are sufficiently small, the dot pattern A1 and the dot pattern B2 cannot be distinguished from each other. Visually, it becomes a simple gray dot, and the dot pattern array 3 portion is a latent image, so that the overall appearance is such that only the pattern and the numeral 53 in FIG. 5 are visible.

In order to make the dot pattern array 3 of FIG. 6 visible, a fly-eye lens array 6 as shown in FIG. 7 is used. As can be seen from the cross-sectional view shown in FIG. 8, the fly-eye lens array 6 includes convex lenses 61 arranged two-dimensionally at an equal pitch on the transparent substrate portion 62, and the pitch is equal to that of the dot pattern array 3. It is the same as the pitch. When this fly-eye lens array 6 is superimposed on the diffraction pattern 5 such as a hologram provided with the dot pattern array 3 and the numeral 53 shown in FIG. 6, the portion of the dot pattern A1 is relatively black as shown in FIG. The dot pattern B2 appears to be relatively white, so that the character pattern “123” that is a latent image can be visually recognized by normal visual observation.

  This is because the focal point of the convex lens 61 is made of a nuclear dot α11 formed by embossing that emits directional scattered light in the first direction and a nuclear dot β22 formed by embossing that emits directional scattered light in the second direction. In this case, only the portions of the nuclear dots α11 and β22 are enlarged by the convex lens 61, and the portions of the peripheral dots α12 and β21 are difficult to see, so that the character pattern ( Here, “123”) becomes visible.

  At this time, if the shape of the nuclear dot is easy to enlarge, for example, a square such as the nuclear dot α11 and the nuclear dot β22 shown in FIG. 1, the focus of the convex lens 61 is increased when the fly-eye lens array 6 is overlapped. Easy to match. The shape of the core dot may be other than a square as long as it is easy to focus. For example, it may be a circle, an ellipse, or a polygon other than a square.

  As shown in FIG. 2 and FIG. 3, when the fly-eye lens array 6 superimposed on the diffraction grating pattern 5 such as a hologram provided with the dot pattern array 3 and the numeral 53 shown in FIG. Since the light scattering ability is reversed, as shown in FIG. 10, the light and dark appear to be reversed like the dot pattern A1 ′ and the dot pattern B2 ′ and the numeral 53 ′ of the dot pattern array 3.

  Furthermore, at least a part of the number 53 (here, the last three digits “123”) that can be seen without overlapping the fly-eye lens array 6, and characters (here, formed as latent images on the dot pattern array 3) Then, “123”) is made coincident, and only when the fly-eye lens array 6 is overlaid, both can be visually compared and the forgery prevention effect is further enhanced.

  The dot pattern array 3 and the numeral 53 can be provided simultaneously when drawing the diffraction grating pattern 5 such as a hologram, but a thermal transfer ribbon in which an emboss that emits directional scattered light in the first direction is formed in the transfer layer. In addition, the thermal transfer ribbon having an emboss that emits directional scattered light in the second direction formed on the transfer layer may be thermally transferred using a thermal head and overlapped on the diffraction grating pattern 5 such as a hologram. Thereby, the dot pattern array 3 and the numeral 53 can be recorded as different information for each medium, and a forgery prevention medium having a higher forgery prevention effect can be obtained.

  As described above, according to the anti-counterfeit medium of the present invention, not only is it difficult to counterfeit a latent image pattern provided to prevent forgery, but the latent image pattern cannot be visually recognized in a normal state. The fact that the latent image pattern is provided is not easily understood, and the trigger for forgery or falsification can be reduced, and a high forgery prevention effect can be obtained.

1, 1 '... dot pattern A
11 ... Nuclear dot α
12 ... Marginal dot α
2, 2 '... dot pattern B
21 ... peripheral dot β
22 ... Nuclear dot β
3... Dot pattern array 4... Diffraction grating pattern such as hologram 5... Pattern 53, 53 ′ provided by overlapping dot pattern array on diffraction grating pattern such as hologram Eye lens array 61 ... convex lens 62 ... transparent substrate

Claims (4)

In part of the diffraction grating pattern such as a hologram,
A nuclear dot α formed by embossing that emits directional scattered light in a first direction, and adjacent to the nuclear dot α, has an area equal to the nuclear dot α, and directional scattered light in a second direction. Dot pattern A consisting of peripheral dots α formed by embossing
A nuclear dot β formed by embossing that emits directional scattered light in the second direction, and a directional scattered light in the first direction adjacent to the nuclear dot β and having the same area as the nuclear dot β. Dot pattern B consisting of peripheral dots β formed by embossing
An arrangement pattern arranged at an equal pitch is provided,
The forgery prevention medium is characterized in that the arrangement pattern is arranged such that the dot pattern A and the dot pattern B form a character or a symbol. In part of the diffraction grating pattern such as the hologram, with respect to incident light,
A character or symbol formed by embossing that emits directional scattered light is described, and a part or all of the character or symbol emits directional scattered light in the first direction or the second. The anti-counterfeit medium according to claim 1, wherein the medium is expressed by embossing that emits directional scattered light in the direction of.   Characters or symbols formed with the dot pattern A, the dot pattern B, and an emboss that emits the directional scattered light are directed in the first direction on a forgery prevention medium on which a diffraction grating pattern such as a hologram is formed. The transfer layer of the thermal transfer ribbon in which the embossing that emits the directional scattered light is formed on the transfer layer and the transfer layer of the thermal transfer ribbon in which the emboss that emits the directional scattered light in the second direction is formed on the transfer layer are provided. A method for producing an anti-counterfeit medium characterized by the above.   A lens array in which convex lenses are arranged at the same pitch as the dot pattern A and the dot pattern B are arranged in the arrangement pattern on the anti-counterfeit medium according to claim 1 or 2, and the dots A dot pattern display method, wherein only the core dots α or the core dots β of the pattern A and the dot pattern B are displayed.