JPH06155888A - Password pattern for preventing duplication forgery - Google Patents

Abstract

PURPOSE:To make it easy to recognize a principal image provided together with a password pattern by making the password pattern of the original image harder to recognize visually, regarding in the password pattern for preventing duplication forgery provided with a hidden pattern for certifying that duplication is made. CONSTITUTION:This is the password pattern A for preventing duplication forgery which has first unit patterns (a) shaped in hair-line patterns constructed of a plurality of groups a1 of parallel straight or curved lines dividing a unit area at equal intervals and second unit patterns (b) shaped in the hair-line patterns constructed of a plurality of groups b1 of parallel straight or curved lines dividing, at equal intervals, a unit area having the same shape and size as the unit area of the first unit patterns (a), and which is provided with a hidden pattern B prepared by arranging the aforesaid first and second unit patterns properly, regularly or irregularly, in the longitudinal and lateral directions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a copy image obtained when an original image (original image) on a desired sheet is copied using an electrostatic copying machine (commonly called a copying machine as a commercial machine). The present invention relates to a copy / counterfeiting prevention personal identification pattern that allows a pattern other than the original image to appear in the (copy image) area.

[0002]

2. Description of the Related Art A conventional security code for copy forgery prevention is disclosed in, for example, Japanese Patent Application No. 53-23224.

FIG. 8 shows a printed matter 1 on which the above-mentioned secret code pattern is printed. Vertically (vertical direction) parallel line 3 areas are provided on a whole surface, and a part of the parallel line 3 area is formed into a desired pattern. A horizontal (horizontal) parallel line 2 is provided in a direction orthogonal to the parallel line 3, and the horizontal parallel line 2 is used in the vertical parallel line 3 area on the printed matter 1. A personal identification pattern displaying characters called VOID is formed.

In a normal copying machine, a light source for illuminating an original image, a lens system for forming a reflected light image from the original image, and a reflected light image are provided under a transparent table on which the original image is placed. A slit plate that includes a slit that converts a long and narrow linear slit light and that can reciprocate in a direction orthogonal to the slit,
It is provided with a rotatable photosensitive drum that rotates in the same direction as the moving direction of the slit plate to transfer toner to a copy sheet.

The moving direction of the slit plate, that is, the rotating direction of the photosensitive drum is defined as the copying direction 4 of the copying machine. For example, the horizontal line 2 of the printed matter 1 having the above-mentioned identification pattern is set as follows.
When the printed matter 1 is copied by an ordinary copying machine in parallel with the copying direction 4, the parallel lines 2 parallel to the copying direction 4 are reproduced with the same thickness as the printed matter 1, but the copying direction 4 The parallel lines 3 in the orthogonal direction are reproduced thinner than the original image.
Alternatively, depending on the thickness of the line 3, there is a tendency that the line is not copied.

FIG. 9A shows a copied image obtained by copying the printed matter 1 with the direction of the parallel line 2 parallel to the copying direction 4, and the VOID of the parallel line 2a of the printed line 2 The letters “” are emphasized and copied.

Further, when the printed matter 1 is copied by an ordinary copying machine with the direction of the horizontal lines 2 of the printed matter 1 perpendicular to the copying direction 4, the direction perpendicular to the copying direction 4 is obtained. Line 2 is reproduced thinner than the original image, or it is not copied depending on the thickness of line 3, and line 3 parallel to the copy direction 4 is reproduced with the same thickness as printed matter 1. It is what is done.

FIG. 9 (b) shows a copied image obtained by copying the printed matter 1 with the direction of the lines 2 orthogonal to the copying direction 4, and the lines 3a of the lines 3 copied. By VO
A character called ID is emphasized and copied in a state of being outlined.

[0009]

SUMMARY OF THE INVENTION Printed matter 1 as described above.
The conventional password pattern applied to the
It is relatively easy to visually recognize that the pattern of the line 2 is formed in the line 3 area, and the effect of preventing counterfeiting by copying may be impaired. It is also a cause of making it difficult to see the main image such as the design and characters that are applied together.

The present invention provides a copy forgery prevention personal identification pattern having a hidden pattern for certifying that a copy has been made,
By making the password pattern of the original image less visible, the main image provided with the password pattern can be easily seen.

[0011]

The first invention of the present invention is as follows:
A linear unit-shaped first unit pattern a composed of a plurality of parallel straight or curved line groups a ₁ dividing the unit area at equal intervals, and a unit area of the same shape size as the unit area of the first unit pattern a. A second unit pattern b in the form of a parallel line pattern constituted by a plurality of parallel straight or curved line groups b ₁ dividing the unit area at equal intervals is provided, and the first unit pattern a and the second unit pattern b are provided. Is a secret pattern B for preventing forgery against copying, which is characterized in that a hidden pattern B in which a plurality of them are arranged regularly or irregularly in the vertical and horizontal directions is applied.

A second aspect of the present invention is provided with a third unit pattern c which has a unit area having the same shape and size as the unit area as a plain pattern having no line group, and the first unit pattern a and the second unit pattern. A secret pattern B for preventing forgery against copying characterized in that a hidden pattern B in which a plurality of patterns b and third unit patterns c are properly arranged regularly or irregularly in the vertical and horizontal directions is applied.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A copy forgery preventing password pattern according to the present invention will be described in detail in accordance with an embodiment. As shown in FIG. 1 (a), a square unit area t is represented by a group of horizontal parallel straight lines a ₁ . The first unit pattern a is a square line pattern formed by dividing the unit pattern a at equal intervals (interval p).

Further, FIG. 1B shows that a square unit area t having the same shape size as the unit area t of the first unit pattern a is perpendicular to a direction orthogonal to the line group a ₁ . The second unit pattern b is a square parallel line pattern formed by dividing the line groups b _{1 of} parallel straight lines at equal intervals (interval p).

The first unit pattern a and the second unit pattern b are not limited to partitioning the square unit area t as described above, and may be, for example, the following ones.

In FIG. 2A, the rectangular unit area t is divided at equal intervals (interval p) by horizontal parallel straight line groups a ₁ to form a rectangular parallelepiped pattern first unit. The pattern is a.

Further, FIG. 2B shows that a rectangular unit area t having the same shape size as the rectangular unit area t is
It is obtained by the second unit pattern b of the rectangular line pattern shape by separating by said line group a group of lines b ₁ in the direction of the vertical line parallel orthogonal to ₁ at equal intervals (interval p) .

Further, FIG. 3A shows, for example, y = sin θ
And a unit area t surrounded by an appropriate number of curves such as two sine curves of y = 2 + sin (θ + 180 °) is divided at equal intervals (interval p) by a group of horizontal parallel straight lines a ₁ . This is the first unit pattern a in a line pattern.

Further, FIG. 3 (b) shows, within a unit area t having the same shape size as the unit area t surrounded by the sine curve, a line of parallel straight lines perpendicular to the line group a ₁ . The second unit pattern b having a rectangular parallelepiped pattern is formed by dividing the group b _{1 at} equal intervals (interval p).

FIG. 4 shows a secret code for preventing forgery for copying, which is formed by combining the square-shaped first unit pattern a and the second unit pattern b shown in FIG. A rectangular combination pattern is formed by combining a plurality of first unit patterns a, and the first unit pattern a inside the combination pattern is removed into a T-shaped pattern and removed into the T-shaped pattern. By arranging the second unit patterns b in the opened portions, the secret code pattern A in which the hidden pattern B of the T-shaped pattern is formed can be obtained.

First, each comprises the personal identification pattern of the present invention.
Various other detailed configurations that can be adopted for the unit pattern a and the second unit pattern b are as follows. As the shape of the unit area t, for example, other polygonal shapes, circular shapes, and the like, other than the above shapes, can be appropriately adopted. The visible contour line does not necessarily have to be provided along the portion corresponding to the unit region t of an appropriate shape and size that configures the first unit pattern a and the second unit pattern b, and can be provided as necessary. When the visible contour line is provided, it is desirable that the thickness of the contour line is thicker than each line of the line groups a ₁ and b ₁ . The first unit pattern a and the second unit pattern b may be arranged so as to be in close contact with each other as shown in FIG. 4, or may be arranged with an appropriate interval maintained as necessary. Good. It should be noted that the unit area t is set in each of the unit patterns a and b.
If visible contours are provided along corresponding portions, it is possible to arrange the contours so that they are adjacent to each other or overlap. It is appropriate that the thickness of each line of the line groups a ₁ and b ₁ forming each unit pattern a and b is set to the same thickness and displayed. The line groups a ₁ and b ₁ forming each unit pattern a and b are
It is colored in an achromatic color tone such as black or gray, or any other appropriate color tone, and either one of the color tone and the density or the color tone and the density of all unit patterns a and b forming the password pattern is unified. It is appropriate to express using color tone and density.

Next, the second invention of the present invention will be explained in detail according to the embodiment with reference to FIG. 5. FIG. 5A shows a unit having the same shape size as the unit area t in the first invention. The third unit pattern c is a solid pattern c _{1 which} is achromatic plain fabric such as white, gray and black, or a colored plain fabric having an appropriate color tone such as red, blue and yellow without providing a line group in the area t. FIG. 5A shows an example of the third unit pattern c that is a white uncolored plain pattern.

A second aspect of the invention is to combine the first unit pattern a and the second unit pattern b of the first aspect with the third unit pattern c to form a regular or irregular pattern in the vertical and horizontal directions. They are arranged to form a copy / counterfeiting protection code pattern.

FIG. 5 (b) is a plan view of a password pattern according to an embodiment of the second invention. The square first unit pattern a, the second unit pattern b, and the second unit pattern b shown in FIG. It is a secret code pattern for preventing copy forgery according to the second aspect of the present invention, which is formed by properly combining three unit patterns c and arranging them densely and regularly in the horizontal and vertical directions.

A quadrilateral combination pattern is formed by combining a plurality of second unit patterns b, and every other second unit pattern b is arranged along the outer periphery of the quadrilateral combination pattern to form a third unit pattern c. By replacing, the second unit pattern b inside the combination pattern is removed into a T-shaped pattern, and the first unit pattern a is arranged in the removed portion in the T-shaped pattern, thereby forming a T-shaped hidden pattern B. Is formed.

[0026] with the lines a ₁ of the first unit pattern a, first copy the anti-counterfeit security pattern of the invention in the case the lines b each line of the thickness of _one second unit pattern b are the same (Figure 4 When the original image sheet such as a printed matter provided as a background image such as a tint block or as a pattern or a mark is copied in a copying direction 4 by a normal commercially available copying machine, , Copied as below.

Each line of the line group a ₁ of each first unit pattern a of the original image in the direction orthogonal to the copying direction 4 is copied finer than the original image and is in the direction parallel to the copying direction 4. Each line of the line group b ₁ of each second unit pattern b of the image is copied and reproduced to have substantially the same thickness as the original image, and a copy image of the password pattern as shown in FIG. The image density of the T-shaped pattern area formed by the line group b ₁ of the second unit pattern b reproduced in the thickness is higher than the image density of the line group a ₁ area of the first unit pattern a reproduced finer. The hidden pattern B of the secret code pattern A is copied with a clear contrast.

Further, the line group a ₁ of the first unit pattern a,
The original image sheet provided with the copy / counterfeiting protection identification pattern (pattern shown in FIG. 4) of the first invention when the thickness of each line of the line group b ₁ of the second unit pattern b is the same is commercially available. When copying is performed in the copying direction 5 using a conventional copying machine, a copy image having a password pattern as shown in FIG. 6B is obtained, and is reproduced with substantially the same thickness. The image density of the T-shaped pattern area by the line group a ₁ of the unit pattern a becomes higher than the image density of the line group b ₁ area of the second unit pattern b which is more finely copied, and the hidden pattern B of the secret code pattern A is obtained. Are reproduced with clear contrast.

FIG. 7 shows a first unit pattern a (see FIG. 3 (a)) composed of a group of horizontal parallel straight lines a ₁ dividing the unit area t surrounded by a curve at equal intervals. Consists of a combination with a second unit pattern b (see FIG. 3B) composed of a group of vertical parallel straight lines b ₁ that divide the unit area t of the same shape size surrounded by a curve at equal intervals. This is a security pattern for preventing copy forgery.

[0030]

The secret code pattern for preventing copy forgery according to the present invention includes a parallel line-shaped first unit pattern a composed of a plurality of parallel straight or curved line groups a ₁ dividing the unit area t at equal intervals. A second unit pattern having a parallel line pattern formed by a plurality of parallel straight or curved line groups b ₁ dividing the unit area t having the same shape size as the unit area t of the first unit pattern a at equal intervals b, or the first unit pattern a and the second unit pattern b, and the third unit pattern c in which the unit area t having the same shape size as the unit area t is a plain pattern having no line group, The first and second unit patterns a, b or the first, second and third unit patterns a, b, c each having a small unit pattern of the same shape size are regularly or irregularly arranged in the vertical and horizontal directions. Arranged in a suitable pattern Then, the first unit pattern a and the second unit pattern b are appropriately adjusted, for example, by making the thickness and color tone of each line of the line groups a ₁ and b ₁ the same, and form an appropriate shape such as a T-shape. The copy forgery preventing personal identification pattern of the present invention in which the hidden pattern B is appropriately arranged in a pattern, since there is no contrast between the first unit pattern a and the second unit pattern b before copying, the hidden pattern B is inconspicuous, but the hidden pattern B is clearly shown in the copy image obtained by copying the password pattern by a copying machine with the direction of each line of the line group a ₁ or the line group b ₁ as the copy direction. To be revealed.

[0031]

As described above, the copy forgery-preventing security code of the present invention makes it more difficult to visually recognize the presence of the hidden pattern before copying, as compared with the conventional security pattern based on the multi-line method.
Even if the personal identification pattern is printed on the printed matter together with the main image such as a picture or letter, it is not difficult to see, and the hidden pattern that proves that it is a copy has a clear contrast in the copied image. The effect is that it can be used as a background pattern of various printed materials.

[Brief description of drawings]

FIG. 1 (a) is a plan view illustrating an example of a first unit pattern constituting a copy / counterfeiting protection code pattern of the present invention, and FIG. 1 (b) is a copy / counterfeiting protection code pattern of the present invention. It is a top view explaining an example of the 2nd unit pattern.

FIG. 2A is a plan view illustrating another example of the first unit pattern that constitutes the copy forgery prevention password pattern of the present invention, and FIG. 2B is a copy forgery prevention password pattern of the present invention. It is a top view explaining the other example of the 2nd unit pattern which constitutes.

FIG. 3A is a plan view illustrating another example of the first unit pattern constituting the copy forgery prevention password pattern of the present invention, and FIG. 3B is a copy forgery prevention password pattern of the present invention. It is a top view explaining other examples of the 2nd unit pattern which constitutes.

FIG. 4 is a plan view illustrating an embodiment of a copy / counterfeiting prevention secret code pattern of the present invention.

FIG. 5A is a plan view illustrating an example of a third unit pattern used in another embodiment of the copy forgery prevention password pattern of the present invention, and FIG. 5B is a copy forgery preventive pattern of the present invention. It is a top view explaining other examples of a secret code pattern.

6 (a) and 6 (b) are plan views for explaining a copy password pattern of a copy forgery preventing password pattern according to an embodiment of the present invention.

FIG. 7 is a plan view illustrating a copy password pattern of a copy forgery preventing password pattern according to another embodiment of the present invention.

FIG. 8 is a plan view of a conventional secret code pattern for copy forgery prevention.

9A and 9B are plan views of a copy password pattern of a conventional copy forgery preventing password pattern.

[Explanation of symbols]

1 ... Printed matter 2 ... Horizontal parallel lines 2a ... Copied lines 3 ... Vertical parallel lines 3a ... Copied lines 4 ... Copy direction 5 ... Copy direction a ... 1st unit pattern b ... 2nd unit pattern c ... third unit pattern A ... security pattern B ... hidden pattern a ₁ ... the lines b ₁ ... the lines c ₁ ... plain pattern t ... unit area p ... interval

Claims (2)

[Claims] 1. A linear unit-shaped first unit pattern a composed of a plurality of parallel straight or curved line groups a ₁ dividing the unit area at equal intervals, and a unit area of the first unit pattern a. And a second unit pattern b in the form of a parallel line pattern, which is composed of a plurality of parallel straight or curved line groups b ₁ that divide the unit area having the same shape size as that of the first unit.
A secret pattern B for preventing copy forgery, wherein a hidden pattern B in which a plurality of unit patterns a and second unit patterns b are arranged regularly or irregularly in a regular or irregular direction is provided. 2. A third unit pattern c having a unit pattern having the same shape size as the unit region as a plain pattern having no line group, and the first unit pattern a, the second unit pattern b, and the third unit pattern. A secret pattern B for preventing forgery against copying, which is provided with a hidden pattern B in which a plurality of c are arranged regularly or irregularly in the vertical and horizontal directions.