JP5800129B2 - Anti-copying printed matter and unauthorized copying judgment method - Google Patents

Description

  The present invention mainly relates to a copy-prevented printed matter and an unauthorized copy determination method for preventing unauthorized copying of gift certificates, forms, coupon tickets, prepaid cards, and the like.

  Conventionally, as a measure for preventing unauthorized copying of gift certificates, forms, coupon coupons, prepaid cards, etc., printed materials have been disclosed in which copying is indicated for copying (Patent Document) 1).

Japanese Patent No. 3509928

  Patent Document 1 describes a printed matter that has a plurality of regions with different screen lines, although it looks uniform at first glance. This printed matter uses the fact that the reproducibility of copying differs between an area with a large number of screen lines and an area with a small number of screen lines, and displays that copying is illegal when copying is performed.

  However, according to the technique described in Patent Document 1, as the performance of the copying machine is improved, the difference in reproducibility of copying between an area with a large number of screen lines and an area with a small number of screen lines is reduced, indicating that the copying is illegal. It is becoming impossible to let you.

  An object of the present invention is to provide a copy-prevented printed matter and an illegal copy determination method capable of determining that the copy is illegal even when the copy is performed by a copying machine with improved performance.

The anti-copying printed matter of the present invention that achieves the above object is
A first copy prevention unit having a first background and a first pattern formed on the first background;
A second copy prevention unit having a second background and a second pattern formed on the second background;
With
The first pattern has a screen density of a predetermined color component different from that of the first background, and is manifested by irradiating light having a complementary color with respect to the predetermined color component,
The second background and the second pattern have different screen line numbers of halftone dots and the same or almost the same screen density,
When copied at a first density or less, the first pattern is not copied, the second pattern is copied,
When copying at a second density higher than the first density, the first pattern is copied, and the second pattern is copied darker than the second background .

  The first background has a tint block pattern.

  Further, the predetermined color component is a yellow component, and is manifested by irradiating blue light.

The yellow component of the first pattern and the yellow component of the first background satisfy the following conditional expression (1).
10 ≦ Yc ≦ 20 (1)
Yc is the difference (%) in screen density between the yellow component of the first pattern and the yellow component of the first background.

  Furthermore, the method for determining unauthorized copying according to the present invention copies a printed matter having a pattern with a different screen density of the yellow component with respect to the background, and irradiates the copied matter obtained by copying the printed matter with blue light, thereby revealing the pattern. It is characterized in that it is determined whether or not the copy is illegal.

  According to the present invention, it is possible to provide a copy-prevented printed matter and an illegal copy determination method capable of determining that the copy is illegal even when copied by a copying machine with improved performance. .

It is a figure which shows the copy prevention printed matter of embodiment. It is the figure which looked at the 1st copy prevention part of the copy prevention printed matter of an embodiment. It is the figure which irradiated blue light to the 1st copy prevention part of the copy prevention printed matter of an embodiment. It is a figure which shows the 2nd copy prevention part of embodiment. It is an enlarged view of a portion of FIG. It is a figure which shows the 1st copy which copied the copy prevention printed matter of embodiment by normal density | concentration. It is the figure which looked at the 2nd copy which copied the copy prevention printed matter of an embodiment by dark concentration. It is the figure which irradiated blue light to the 2nd copy which copied the copy prevention printed matter of an embodiment by dark concentration.

  Hereinafter, the copy-preventing printed matter according to the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram illustrating a copy prevention printed matter P of the embodiment.

  The copy prevention printed matter P of the embodiment includes a first copy prevention unit 1 and a second copy prevention unit 2. The copy prevention printed matter P may be printed with the first copy prevention unit 1 and the second copy prevention unit 2 on the entire surface, or the first copy prevention unit 1 and the second copy prevention unit 2 may be printed on a part thereof. Also good. Further, it is preferable that the copy prevention printed matter P is printed by an ink jet printer that forms dots.

  The first copy prevention unit 1 includes a first background 11, a predetermined tint block pattern 12 formed on the first background 11, and a predetermined first pattern 13 formed on the first background 11.

  The second copy prevention unit 2 includes a second background 21 and a predetermined second pattern 22 formed on the second background 21.

  FIG. 2 is a view of the first copy prevention portion of the copy prevention printed matter according to the embodiment, and FIG. 3 is a view in which the first copy prevention portion of the copy prevention print matter according to the embodiment is irradiated with blue light.

  As shown in FIG. 2, the first copy prevention unit 1 includes a first background 11, a tint block pattern 12 formed on the first background 11 and made up of predetermined graphics and / or characters, and the first background 11. And a first pattern 13 formed of a predetermined figure and / or character or the like.

The first pattern 13 shown in FIG. 1 is formed with a slight difference in the screen density of the yellow component with respect to the first background 11. For example, it is preferable that the yellow component of the first pattern 13 and the yellow component of the first background 11 satisfy the following conditional expression (1).
10 ≦ Yc ≦ 20 (1)
However, Yc is the difference (%) between the yellow component of the first pattern 13 and the yellow component of the first background 11.

  It is known that the sensitivity of the human eye varies with wavelength. In general, in a bright environment, the sensitivity of green is the highest and the sensitivity of yellow is low. Accordingly, it is difficult for human eyes to see the difference between the first pattern 13 of the first copy prevention unit 1 and the first background 11. The yellow component is a color component having a wavelength λ of about 565 nm ≦ λ ≦ 575 nm.

  In particular, when the tint block pattern 12 is formed, the tint block pattern 12 becomes a camouflage, and the first pattern 13 is hardly distinguishable from the background 11 by visual observation. Accordingly, the first copy prevention unit 1 can normally observe only the first background 11 and the predetermined background pattern 12 formed on the first background 11 as shown in FIG.

  When the first copy prevention unit 1 is irradiated with blue light, which is a complementary color of yellow, a subtle difference between the yellow component of the background 11 and the first pattern 13 becomes clear. Therefore, the first pattern 13 that is not normally visible when visually observed is made visible and visible as shown in FIG. 3 by irradiation with blue light. In the present embodiment, the yellow component of the first pattern 13 is given a slight difference to irradiate blue light that is a complementary color of yellow, but the other predetermined color component is given a slight difference. Thus, it may be configured to irradiate light that is a complementary color of the predetermined color component.

  Next, the second copy prevention unit 2 of the copy prevention printed matter P shown in FIG. 1 will be described.

  FIG. 4 is a diagram showing the second copy prevention unit 2 of the embodiment, and FIG. 5 is an enlarged view of a part of FIG.

  As shown in FIG. 4, the second copy prevention unit 2 includes a second background 21 and a second pattern 22 formed on the second background 21 and including predetermined graphics and / or characters. The second background 21 and the second pattern 22 are formed by halftone dots as shown in FIG. The screen lines of the halftone dots of the second background 21 and the second pattern 22 are different, but the screen densities of the second background 21 and the second pattern 22 are the same or substantially the same.

  Since the screen densities of the second background 21 and the second pattern 22 are the same or substantially the same, the second background 21 and the second pattern 22 are almost indistinguishable with the naked eye. Looks uniform.

  In the conventional copying machine, when the second copy preventing unit 2 is copied, it is clear that the second pattern 22 made up of the characters “copy” emerges and illegal copying is performed. However, due to the improved performance of the current copying machine, the second background 21 and the second pattern 22 of the copied material are almost indistinguishable with the naked eye even when copying at normal density. The prevention part 2 looks uniform. However, when copying at a high density, the second copy prevention unit 2 has a large contrast due to the difference in the number of lines between the second background 21 and the second pattern 22, and the characters “copy” are raised.

  As an example, the screen line number of the halftone dots of the second background 21 shown in FIG. 5A is 175 (lpi), and the screen line number of the halftone dots of the second pattern 22 shown in FIG. When it is 45 to 80 (lpi), the screen density of the second background 21 and the second pattern 22 is preferably the same or substantially the same between 10 to 20%.

  FIG. 6 is a diagram showing a first copy P1 obtained by copying the copy-preventing printed matter P of the embodiment at a normal density, and FIG. 7 is a second copy P2 obtained by copying the copy-proof printed matter P of the embodiment at a high density. FIGS. 8A and 8B are diagrams in which blue light is irradiated to the second copy P2 obtained by copying the copy-preventing print P of the embodiment at a high density.

  A copy prevention printed matter P having the first copy prevention unit 1 and the second copy prevention unit 2 as shown in FIG. 1 is copied at a normal density. Then, as shown in FIG. 6, the second copy prevention unit 2 ′ of the first copy P1 is normally copied, but the first copy prevention unit 1 ′ cannot reproduce the slight difference due to the yellow component by copying. Therefore, the first pattern 13 ′ of the first copy P1 disappears and is not reproduced. Therefore, the first pattern 13 ′ of the first copy P1 cannot be seen by visual observation or irradiation with blue light, and the first copy P1 is produced by unauthorized copying. Can be determined.

  Next, the printed matter P having the first copy preventing unit 1 and the second copy preventing unit 2 as shown in FIG. 1 is copied at a darker density than usual. Then, as shown in FIG. 7, in the second copy prevention portion 2 ″ of the second copy P2, the difference in contrast between the second background 21 ″ and the second pattern 22 ″ increases, and the copied characters are lifted. The second copy P2 can be determined to have been produced by unauthorized copying.

  Although the first copy preventing portion 1 ″ of the second copy P2 is normally copied, the first pattern 13 ″ is hardly distinguishable from the background 11 ″ by visual inspection. As shown in FIG. 7, the first copy preventing portion 1 ″ of P2 normally observes only the first background 11 ″ and the predetermined pattern 12 ″ formed on the first background 11 ″ as shown in FIG. Can do.

  When the first copy preventing portion 1 "of the second copy P2 is irradiated with blue light that is a complementary color of yellow, a slight difference between the yellow component of the background 11" and the first pattern 13 "becomes clear. Therefore, the first pattern 13 ″ of the second copy P2 that was not visible when visually observed becomes visible and visible as shown in FIG.

  Next, examples will be described.

  The following table shows the state of the copy-prevented printed material and the copied material when the screen density of the yellow component of the background 11 and the first pattern 13 is different. Table 1 shows a case where the difference in screen density of the yellow component between the background 11 and the first pattern 13 is 10%. Table 2 shows a case where the difference in screen density of the yellow component between the background 11 and the first pattern 13 is 15%. Table 3 shows the case where the difference in screen density of the yellow component between the background 11 and the first pattern 13 is 20%. Further, C represents a cyan screen density, and M represents a magenta screen density. For example, C20 indicates that the screen density of cyan is 20%, and M20 indicates that the screen density of magenta is 20%.

  In the table, ◎ indicates that the first pattern 13 having a different screen density of the yellow component of the copy-preventing printed matter P is sufficiently concealed and cannot be visually observed, but can be confirmed by irradiating with blue light, and The copy shows a case where the first pattern 13 cannot be seen even when irradiated with blue light.

  In addition, ◯ indicates that the first pattern 13 having a different screen density of the yellow component of the copy-prevented printed matter P is concealed and difficult to see visually, but can be confirmed by irradiating with blue light. The case where the 1st pattern 13 cannot be seen even if it irradiates with blue light is shown.

  Further, Δ is a case where the first pattern 13 having a different screen density of the yellow component of the copy prevention printed matter P is sufficiently concealed and cannot be visually observed, but is difficult to confirm even by irradiating with blue light, and The copy shows a case where the first pattern 13 cannot be seen even when irradiated with blue light.

Further, x indicates that the first pattern 13 with a difference in the screen density of the yellow component of the copy-preventing printed matter P is visible, and the copy is irradiated with blue light and the first pattern 13 is The case where it is visible is shown.

  As can be seen from Tables 1 to 3, when the difference in screen density of the yellow component between the background 11 and the first pattern 13 is 10% to 20% and the background is a single cyan or magenta color, a cyan or magenta screen. The concentration is preferably 20% or less. Further, when the screen density difference between the yellow component of the background 11 and the first pattern 13 is 10% to 20% and the background is a mixture of cyan and magenta, the screen density of cyan and magenta is 15% or less, respectively. preferable.

  As described above, the copy prevention printed matter 1 is formed on the first background 11 and the first background 11 having the first pattern 13 formed on the first background 11 and the second background 21 and the second background 21. A second copy prevention unit 2 having a second pattern 22, and the first pattern 13 has a screen density of a predetermined color component different from that of the first background 11 and is complementary to the predetermined color component. When the second background 21 and the second pattern 22 are manifested by irradiating light, the screen density of the halftone dots is different and the screen density is the same or substantially the same, and the second background 21 and the second pattern 22 are copied below the first density, When the first pattern 13 is not copied and is copied at a second density higher than the first density, the second pattern 22 is copied darker than the second background 21, so that the copying machine with improved performance is obtained. When copying by Even, it is possible to determine that an unauthorized copy.

  Also, since the first background 11 has a background pattern, the background pattern 12 becomes a camouflage, and the first pattern 13 is almost indistinguishable from the background 11 and is preferable.

  Further, since the predetermined color component is a yellow component, it is preferable that the difference between the first pattern 13 of the first copy preventing unit 1 and the first background 11 is difficult to be seen by human eyes.

Further, since the yellow component of the first pattern 13 and the yellow component of the first background 11 satisfy the following conditional expression (1), the sensitivity to human eyes is further reduced, and the first copy prevention unit It is preferable that the difference between the first pattern 13 and the first background 11 is difficult to see.
10 ≦ Yc ≦ 20 (1)
However, Yc is the difference (%) between the yellow component of the first pattern 13 and the yellow component of the first background 11.

  Further, the illegal copy determination method copies the copy-preventing printed matter P having the first pattern 13 having a different yellow screen density to the first background 11 and emits blue light to the copy obtained by copying the copy-preventing printed matter P. Since it is determined whether or not the illegal copy is made based on whether or not the first pattern 13 is revealed by irradiation, it is determined that the copy is illegal even if it is copied by a copying machine with improved performance. It becomes possible to do.

  As described above, the anti-copying printed matter has been described based on some examples, but the present invention is not limited to these examples, and various modifications are possible.

1, 1 ', 1 "... 1st copy prevention part 11, 11', 11" ... 1st background 12, 12 ', 12 "... Background pattern 13, 13', 13" ... 1st pattern 2, 2 ', 2 "... second copy prevention unit 21, 21 ', 21" ... second background 22, 22', 22 "... second pattern P ... copy prevention printed matter P1 ... first copy P2 ... second copy

Claims (5)

A first copy prevention unit having a first background and a first pattern formed on the first background;
A second copy prevention unit having a second background and a second pattern formed on the second background;
With
The first pattern has a screen density of a predetermined color component different from that of the first background, and is manifested by irradiating light having a complementary color with respect to the predetermined color component,
The second background and the second pattern have different screen line numbers of halftone dots and the same or almost the same screen density,
When copied at a first density or less, the first pattern is not copied, the second pattern is copied,
When copying at a second density darker than the first density, the first pattern is copied, and the second pattern is copied darker than the second background. Prevent printed matter. The copy-prevented printed matter according to claim 1, wherein the first background has a tint block pattern. The copy-prevented printed matter according to claim 1 or 2, wherein the predetermined color component is a yellow component. The anti-copying printed matter according to claim 3, wherein the yellow component of the first pattern and the yellow component of the first background satisfy the following conditional expression (1).
10 ≦ Yc ≦ 20 (1)
Yc is the difference (%) in screen density between the yellow component of the first pattern and the yellow component of the first background. Copy the printed matter having a pattern with different screen density of the yellow component against the background,
An unauthorized copy determination method, wherein whether or not an illegal copy is made is determined based on whether or not the pattern is exposed by irradiating a copy of the printed material with blue light.

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