JP2001324949A - Dot pattern display medium as well as method for manufacturing the same, authenticity discrimination method and copying prevention method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display medium which is capable of forming plural color images of dot patterns as latent images and is capable of displaying the latent images when lens arrays are aligned and to provide the display medium which is capable of detecting the copying of the display medium having these dot patterns in case the display medium is copied and which has a function to prevent forgery and alteration. SOLUTION: This dot pattern display medium 30 is provided with the dot patterns 32a and 32b consisting of dots of at least >=2 kinds of the same pitch as the pitch of the lenses of the lens array 11 and has the dot patterns with which the images are made to appear by superposing the lens arrays 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display medium having a dot pattern for displaying an image such as a changing picture, an animation, or a stereo image used for a hidden picture or a play with a lens array such as a fly-eye lens or a lenticular. The present invention relates to a dot pattern display medium having a latent image or copy check effect for improving security such as a security medium, and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, as a method of concealing a pattern such as a character in a picture, there is a method of changing a screen angle of a halftone dot constituting a printed picture only in a portion where the pattern is formed as shown in FIG. When a film (92) in which halftone dots are formed is applied to the picture, moiré occurs at a portion having the same screen angle, and a technique of displaying a hidden pattern (93) is used. However, in this method, the number of images that can be placed in the same place is limited, and the color is also limited to a single color.

[0003]

Accordingly, a dot pattern display medium capable of displaying a latent image when a plurality of color images are formed as a latent image in a dot pattern and the lens array is aligned, and a display medium having this dot pattern are provided. An object of the present invention is to provide a display medium having a function of detecting a copy and preventing the forgery and falsification of the copy medium. It is another object of the present invention to use the above function to determine the authenticity of securities and prevent duplication.

[0004]

Means for Solving the Problems According to the present invention, in order to solve the above-mentioned problems in the present invention, the invention according to claim 1 is provided.
A dot pattern display medium comprising: a dot pattern including dots of at least two or more colors having the same pitch as the pitch of the lenses of the lens array; and a dot pattern on which an image appears by overlapping the lens array. is there.

According to a second aspect of the present invention, there is provided a region adjacent to each dot constituting the dot pattern and having a different color from the dot and having the same area as the dot. A dot pattern display medium according to claim 1.

According to a third aspect of the present invention, there is provided a dot pattern display according to the first aspect, wherein a colored area portion of a color different from the dot is provided in the vicinity of each dot constituting the dot pattern. Medium.

According to a fourth aspect of the present invention, each of the dots constituting the dot pattern comprises at least two types of halftone dots having a screen ruling. 2. A dot pattern display medium according to claim 1.

According to a fifth aspect of the present invention, in each of the first to third aspects, each dot constituting the dot pattern is composed of halftone dots of at least two or more screen angles. 2. A dot pattern display medium according to item 1.

According to a sixth aspect of the present invention, each dot constituting the dot pattern is composed of halftone dots having at least two types of screen rulings and at least two types of screen angles. Claim 1
A dot pattern display medium according to any one of claims 1 to 3.

According to a seventh aspect of the present invention, the dots forming the dot pattern are formed so as to be shifted so as not to overlap each other. Is a dot pattern display medium.

The invention according to claim 8 is characterized in that the dot patterns are arranged so that separate images can be seen by the right eye and the left eye when the dot pattern passes through the lens array. A dot pattern display medium according to any one of the preceding claims.

According to a ninth aspect of the present invention, there is provided a dot pattern display medium having a dot pattern according to any one of the first to eighth aspects in a part of a normal image. .

The invention according to claim 10 is a method for manufacturing a dot pattern display medium, which is manufactured by printing or using a printer.

[0014] According to an eleventh aspect of the present invention, there is provided a method of manufacturing a dot pattern display medium, comprising means for changing and providing at least a part of an image represented by a dot pattern. This is a method for manufacturing a dot pattern display medium.

[0015] The invention according to claim 12 is the first invention.
10. A method of determining authenticity, comprising: placing a lens array on the dot pattern display medium according to any one of claims 9 to 9; and determining a genuine product when a specific image appears. .

The invention according to claim 13 is the third invention.
A method of preventing duplication, characterized by utilizing the fact that a specific image appears when the dot pattern display medium according to any one of claims 5 to 5 is duplicated.

Generally, the terms dot and halftone are synonymous.
However, in the present specification, in order to make the invention easy to understand, dots indicate points (areas) that are components of an image displayed when the lens array of the present invention is overlaid, and halftone dots indicate printing in the printing field. It refers to the usual points that are defined and is expressed separately. That is, the halftone dots are collected to form one image component, and the lump is also called a dot.

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view showing the shape of a fly-eye lens, which is a type of lens array used in the present invention. FIG. 2 is a sectional view taken along line XX of FIG.

The fly-eye lenses (11, 21) in FIG.
A compound eye lens used in integral photography (IP) and stereoscopic televisions, etc., and a transparent flat plate (13,
23) has a structure in which convex lenses (12, 22) are spread over. As a method of manufacturing the fly's eye lens, a method of forming the mold using injection molding or press molding in addition to laying a convex lens on a transparent flat plate can be considered.

The convex lenses (12, 22) constituting the fly-eye lens used in the present invention preferably have a pitch width of about 0.1 mm to 10 mm, and the magnification is preferably about 2 to 20 times.

FIG. 3 is a conceptual plan view illustrating a display medium (30) having a dod pattern corresponding to a fly-eye lens, and an area corresponding to one size of a lens array is referred to as a cell in this specification. It shall be. That is, the cells surrounded by the vertical and horizontal pitches of the lens are cells, and FIG.
In (a), 31 indicates a cell. In this cell (31), dot patterns (32a, 32a) constituting a plurality of images are provided.
b). For example, in FIG.
Is a dot pattern that displays an image of “T” and a dot pattern of 32b is a dot pattern that displays an image of “O”, as shown in FIG. 4), the fly-eye lens (11) is superimposed on the lens, and the lens is focused on the dot pattern of 32a. The image “T” shown in FIG. 4A is moved to the dot pattern of 32b by moving the fly-eye lens. When the focus of the lens is adjusted, an image “O” shown in FIG. 4B is displayed.

The dots constituting the dot pattern are provided with a size substantially equal to the focus size of the lens. In addition, any color of the dots constituting the dot pattern may be used. When a dot pattern is formed by full-color dots and viewed through a fly-eye lens, a full-color image appears.

Although only the dots constituting two images are shown in the cell (31) in FIG. 3, the number of dots formed by forming a dot number of an image larger than this and overlaying the lens array on each dot is formed. Can be displayed.

Further, when a plurality of dots are provided in the same cell, a plurality of dots can be provided in the same cell by providing a dot pattern shifted within the pitch of the convex lens constituting the fly-eye lens. When the lens is adjusted to any one of these dot patterns, an image of another dot pattern appears by changing the viewing angle. By utilizing this, a changing of an image and an animation in which the image has a motion are realized.

FIG. 5 is a diagram for explaining a dot pattern display medium having a function of camouflaging a dot pattern constituting a latent image (hidden picture) so as to make the latent image indistinguishable and prevent forgery and tampering. .

FIG. 5A shows a pseudo dot (41a) which is adjacent to the dot (42), has a different color from the dot, and has a region (43) having the same area as the dot (42). Also, FIG. 5B shows that, in contrast to the pseudo dot 41a, the pseudo dot 4
In the area of 45 corresponding to 43, the color of the dot (42) is the other pseudo dot (41b).

The pseudo dots (41a, 41a,
41b), even if the dot pattern is a full-color image, it is seen as a mere halftone dot from a distance, and both are seen in the same color tone so that they cannot be distinguished from each other. It is possible to make it difficult to recognize what kind of latent image is embedded.

Therefore, as shown in FIG. 5 (c), when the image "T" is made a latent image (hidden picture) with the pseudo dots of 41a and the pseudo dots of 41b are arranged around the latent image, what kind of latent image (hidden picture) When the user looks at the display medium with the naked eye or embedded with the picture), it is difficult to make a distinction. Therefore, an effect that it is not known that the latent image (hidden picture) is provided is produced, and forgery and tampering can be prevented by providing the latent image (hidden picture) with a dot pattern in securities.

In FIG. 5, the shape of the dot and the shape of the pseudo dot are shown as rectangles, but may be any shape such as a circle, but usually a rectangle or a circle is generally used.

FIG. 5 shows a case where an area having a different color is provided adjacent to the dot. However, the area does not necessarily need to be in contact with the dot. A similar effect can be obtained. Further, it is more preferable that the color of the dot (42) and the color of the area portion (43) have a complementary color relationship with each other, because the latent image (hidden picture) is difficult to recognize.

FIGS. 6A and 6B show examples in which the screen ruling and the screen angle of the dots constituting the dot pattern are changed, and FIG. 6C shows the dot pattern formed by the dots having different screen rulings. This is an example. The dot does not necessarily need to be formed by one point, and a similar effect can be obtained without any problem even if it is a set of small points.

Therefore, if the dot area ratio is the same, it looks the same when viewed through a fly's eye lens normally, but when copied, the line density is large or the dot density reproduced by the dot angle is large. Changes. By making use of this fact to form a dot pattern in which the screen ruling and / or screen angle is changed by dots, it is possible to identify whether or not a copy has been made.

That is, when dots are formed by halftone dots having a fine screen ruling of, for example, 300 lines / inch or more, they cannot be resolved by the copying machine and are crushed, and a crushed dot pattern (specific image) appears. In addition, since there are different types of copiers depending on the directionality, even if the screen angle is changed, crushing occurs and a similarly crushed dot pattern (specific image) appears.

Further, by simultaneously changing the screen ruling and the screen angle to form a dot pattern, duplication becomes more difficult, and the forgery prevention effect can be enhanced.

When the lens array is superimposed on the dot pattern, and the focal position of each lens constituting the lens array matches the dot position, a latent image (hidden picture) composed of the dot pattern can be displayed. However, when the dots overlap, the overlapping portion becomes noise. Therefore, in order to clearly separate and display an image, it is better that the dots do not overlap. However, even when sacrificing image separation, camouflage is performed so that a third person does not know that a latent image (hidden picture) is embedded, and it is overlapped when forgery or tampering is prevented. No problem.

A lens array is placed on this dot pattern display medium, and it can be determined whether the image is a genuine product or a forged one based on whether or not a latent image (hidden picture) composed of a dot pattern appears. It can be used as one means of countermeasures against counterfeiting of securities and the like.

As another method of preventing forgery and tampering, as shown in FIG. 8, a dot pattern (dot pattern) is formed so as to be blended with a part of a normal pattern (81) without discomfort with the pattern and color tone around the dot. 82) is formed in advance. At this time, it may overlap with a halftone dot constituting a normal picture.

As shown in FIG. 7, a fly-eye lens (73) is formed by using the parallax between the right eye (71) and the left eye (72).
When passing through, a three-dimensional image can be displayed by providing a dot pattern (75) viewed by the right eye and a dot pattern (74) viewed by the left eye so that images having different parallaxes can be viewed.

The dot pattern can be formed on the medium by printing, and a display medium having the dot pattern can be manufactured. The printing method used here is
Existing printing techniques such as offset, gravure, letterpress, and screen can be used, and examples of the medium include materials used for normal printing, such as paper, resin films, and metal foils.

When a printer connected to an information processing device is used for forming the dot pattern medium, a display medium on which a dot pattern of an image processed and manufactured by the information processing device (computer) is formed. Can be. Further, by forming a dot pattern related to the numbered number of a security medium or the like, security is improved.

The lens array used in the present invention is a fly-eye lens and a honeycomb lens when arranged two-dimensionally, and a lenticular when arranged one-dimensionally.

[0042]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a normal image, the character "T" (82) is a rectangular dot, and the character "COPY" (83) is a dot pattern with a large screen ruling, so that it blends into the surrounding normal pattern. An image as shown in FIG. 8 is created on a computer with dots, and Y, M,
Make four films for C and K, make a printing plate,
Printing was performed using an offset printing machine to obtain a medium.

This is a normal image at first glance,
Looking through the fly's eye lens, "T", "COPY"
Appeared and functioned as a latent image medium. In addition, the medium obtained by printing is color-copied, and what is obtained by copying is used as a check medium for counterfeiting and falsification, in which the character "COPY" made of dots with a large screen ruling appears and appears. Worked.

[0044]

According to the present invention, by providing dots constituting a plurality of color images in one cell as described above, it is possible to realize a changing image in which images change and an animation image in which images move. it can. When the dot pattern is an image having parallax, a three-dimensional image can be obtained.

Further, pseudo dots are provided adjacent to the respective dots constituting the dot pattern and provided in a region different in color from the dots and having an area having the same area as the dots, and by camouflaging the dot patterns, Since it is unknown whether the latent image (hidden picture) is embedded or not, forgery, falsification, and the like are difficult. Therefore, this is an effective means for preventing securities and counterfeiting.

Also, by embedding the dot pattern of the present invention in a part of a normal picture without a sense of incompatibility with the normal picture, it is impossible to know what latent image (hidden picture) is embedded. Tampering becomes difficult. Therefore, this is an effective means for preventing securities and counterfeiting.

Further, a lens array is placed on a dot pattern display medium, and it is possible to determine whether or not a specific image appears, and to form a dot pattern with a screen ruling or screen angle that cannot be resolved when copying. This has the effect of preventing forgery and tampering.

[Brief description of the drawings]

FIG. 1 is a plan view of a fly-eye lens used in the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

3A and 3B are views for explaining a dot pattern and an image appearing when a fly-eye lens is passed through the dot pattern. FIG. 3A is a plan view of a display medium having a dot pattern, and FIGS. FIG. 4 is a cross-sectional view illustrating a case where each dot of the display medium is focused.

4A and 4B show images displayed when one dot in FIG. 3 is focused, and FIG. 4A shows a case where the dots constituting the “T” image are focused; Indicates an image displayed when the dots constituting the “O” image are focused.

FIG. 5 is a view for explaining a display medium having a dot pattern using pseudo dots that are adjacent to the dots constituting the dot pattern, have a different color from the dots, and have an area portion having the same area as the dots; (A), (b) is a conceptual plan view of a pseudo dot, (c) is a conceptual plan view of a display medium having the pseudo dot.

FIG. 6 illustrates dots and dot patterns with different screen rulings and screen angles;
(A) and (b) are dots with different screen rulings and screen angles, and (c) is a conceptual plan view of a display medium having the dots.

FIG. 7 is a schematic diagram illustrating a case where a stereoscopic image is displayed using parallax between the right eye and the left eye.

FIG. 8 is a plan view showing an example in which a dot pattern is formed in a normal image.

9A and 9B are views for explaining a conventional method of providing a latent image pattern, in which FIG. 9A is a schematic plan view in which a latent image is provided by changing a screen angle, and FIG. 9B is a schematic view of a film for generating moiré. (C) is a schematic plan view showing a latent image generated by moire when (b) is superimposed on (a).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Fly-eye lens 12 ... Convex lens 13 ... Transparent flat plate 21 ... Fly-eye lens 22 ... Convex lens 23 ... Transparent flat plate 30 ... Display medium 31 ... Cell 32a, 32b ... Dot pattern 40 ... Display medium 41a, 41b ... Pseudo dots 42 ... Dot 50 ... Display medium 71 ... Right eye 72 ... Left eye 74 ... Dot pattern seen by right eye 75 ... Dot pattern seen by left eye 80 ... Display medium 81 ... Normal image 82 ... Dot pattern latent image 83 ... Screen ruling Large dot pattern latent image 91 ... Hidden pattern (latent image) 92 ... Film 93 ... Hidden pattern appeared by moiré

Claims (13)

[Claims] 1. A dot pattern comprising dots of at least two or more colors having the same pitch as the pitch of the lenses of a lens array, and a dot pattern on which an image appears by overlapping the lens arrays is provided. Dot pattern display medium. 2. A method according to claim 1, further comprising the step of: providing a region adjacent to each of the dots forming the dot pattern and having a different color from the dots and having the same area as the dots.
The dot pattern display medium described in the above. 3. The dot pattern display medium according to claim 1, wherein a colored area portion of a color different from the dot is provided in the vicinity of each dot constituting the dot pattern. 4. The dot pattern display according to claim 1, wherein each dot constituting the dot pattern comprises at least two types of halftone dots having a screen ruling. Medium. 5. The dot pattern display medium according to claim 1, wherein each dot constituting the dot pattern is composed of halftone dots having at least two or more screen angles. . 6. The method according to claim 1, wherein each dot constituting the dot pattern is composed of halftone dots having at least two or more screen rulings and at least two or more screen angles. 2. The dot pattern display medium according to claim 1. 7. The dot pattern display medium according to claim 1, wherein the dots constituting the dot pattern are formed so as to be shifted so as not to overlap each other. 8. The dot pattern according to claim 1, wherein the dot pattern is arranged so that separate images can be seen by a right eye and a left eye when the dot pattern passes through a lens array. Display medium. 9. A method according to claim 1, wherein a part of a normal image is included.
A dot pattern display medium having the dot pattern according to any one of the above. 10. A method for manufacturing a dot pattern display medium, which is manufactured by printing or using a printer. 11. A method of manufacturing a dot pattern display medium according to claim 10, further comprising means for changing and providing at least a part of an image represented by the dot pattern. How to make a medium. 12. A lens array placed on the dot pattern display medium according to any one of claims 1 to 9, and when a specific image appears, the lens array is determined to be genuine. True / false judgment method. 13. A duplication preventing method characterized by utilizing the fact that a specific image appears when duplicating the dot pattern display medium according to any one of claims 3 to 5.