JP5812260B2 - Copy-proof printed matter - Google Patents

Description

  The present invention mainly relates to a copy-prevented printed matter that prevents 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 that can be determined to be unauthorized copying even when copying 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 preventing portion having a first background having the same screen density and a first pattern formed on the first background and visible ;
A second copy prevention unit having a second background and a second pattern formed on the second background;
With
The first pattern has a gradation that changes darkly from the screen density of the first background and a gradation that changes lightly from the screen density of the first background , and
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 copying at a first density or lower, the first copy prevention unit is not copied,
When copying at a second density higher than the first density, the second pattern of the second copy prevention unit is copied darker than the second background.

  According to the present invention, it is possible to provide a copy-prevented printed matter that can be determined to be unauthorized copying even when copying is performed by a copying machine with improved performance.

It is a figure which shows the copy prevention printed matter of embodiment. It is a figure which shows the 1st copy prevention part of the copy prevention printed matter of embodiment. It is a figure which shows the density distribution of the printed matter in the line | wire which connects XY of FIG. It is a figure for demonstrating the Crake O'Brien effect. It is a figure for demonstrating the Crake O'Brien effect. It is a figure which shows density distribution perceived by the Crake O'Brien effect. It is a figure which shows the 2nd copy prevention part of embodiment. It is the figure which expanded a part of FIG. It is a figure which shows the copy which copied the copy prevention printed matter of embodiment by normal density | concentration. It is a figure which shows the copy which copied the copy prevention printed matter of embodiment by the dark density.

  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 first copy prevention unit 1 and the second copy prevention unit 2 may be printed on the entire surface of the copy prevention printed matter P, or the first copy prevention unit 1 and the second copy prevention unit 2 may be printed on a part thereof. May be. 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 and a predetermined first pattern 12 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 diagram showing the first copy prevention unit 1 of the copy prevention printed matter P of the embodiment, and FIG. 3 is a diagram showing the density distribution of the printed matter at the line connecting XY in FIG.

  As shown in FIG. 2, the first copy preventing unit 1 includes a first background 11 and a first pattern 12 formed on the first background 11 and made up of a predetermined figure and / or character by a low density gradation. Have. The first background 11 has an outer portion 11 a located outside the first pattern 12 and an inner portion 11 b located inside the first pattern 12.

  As shown in FIG. 3, the outer portion 11a and the inner portion 11b constituting the first background 11 have the same screen density uniformly. On the other hand, the first pattern 12 has a gradation including a portion 12a having a high screen density and a portion 12b having a thin screen density.

  Here, the Clay O'Brien effect will be described.

  4 and 5 are diagrams for explaining the Crake O'Brien effect.

  The boundary 53 between the first region 51 and the second region 52 shown in FIG. 4 forms a gradation composed of a portion 53a having a high screen density and a portion 53b having a low screen concentration as shown in FIG. doing. Then, in the human eye, the screen density of the first region 51 on the side of the dense portion 53a of the boundary 52 is more uniform than that of the second region 52 on the side of the thin portion 53b of the boundary 52. Looks dark.

  However, actually, when the boundary 53 is covered, as shown in FIG. 5, the first area 51 and the second area 52 have the same screen density. This optical illusion of human eyes is called the Crake O'Brien effect.

  FIG. 6 is a diagram showing a density distribution perceived by the Crake O'Brien effect.

  The first pattern 12 of the first copy prevention unit 1 shown in FIG. 2 actually has a gradation as shown in FIG. However, when viewed with the human eye, it appears as a density distribution as shown by the line V in FIG. As a result, visual observation is easy even at a low concentration as a whole.

  As shown in FIG. 1, the copy-preventing printed matter P of the present embodiment uses such a Clay O'Brien effect to form a first copy having a first pattern 12 that can be visually confirmed even at a low density. The prevention unit 1 is included. In the first copy preventing unit 1 of the present embodiment, the outer portion 11a of the first pattern 12 shown in FIG. 2 looks dark and the inner portion 11b looks thin.

  The first anti-copying portion 1 of the anti-copying printed matter P can be visually confirmed by the Clay O'Brien effect, and disappears and is not reproduced when copying below the normal first density, and is darker than the normal first density. It is formed at a low density that can be reproduced only after copying at the second density.

  As an example, 3 ≦ a2 ≦ 6 using the screen density a1, a2, a3 (%) shown in FIG. 6 with cyan or magenta single color ink or ink obtained by multiplying the same amount of cyan and magenta. If printing is performed with a2-4 ≦ a1 ≦ a2-1 and a2 + 1 ≦ a3 ≦ a2 + 4, respectively, they are not reproduced in normal copying but disappear, and can be reproduced only after copying at a density higher than the normal density. It is possible to realize the first copy prevention unit 1 formed with a high density.

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

  FIG. 7 is a diagram showing the second copy prevention unit 2 according to the embodiment, and FIG. 8 is an enlarged view of a part of FIG.

  As shown in FIG. 7, 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. As shown in FIG. 8, the second background 21 and the second pattern 22 are formed by halftone dots. 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. 8A 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. 9 is a diagram showing a first copy P1 obtained by copying the copy prevention printed matter P of the embodiment at a normal density, and FIG. 10 is a second copy P2 obtained by copying the copy prevention printed matter P of the embodiment at a density higher than usual. FIG.

  The 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 first density. Then, as shown in FIG. 9, the second copy prevention unit 2 ′ is normally copied, but the first copy prevention unit 1 ′ has a low density, so that either the first background 11 or the first pattern 12 is used. Disappears and is not reproduced. Therefore, it is possible to determine that the first copy P1 is produced by unauthorized copying.

  Next, the 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 second density higher than usual. Then, as shown in FIG. 10, the first copy prevention unit 1 ″ is normally copied, but the second copy prevention unit 2 ″ has a large contrast difference between the second background 21 ″ and the second pattern 22 ″. Thus, the second pattern 22 ″ is copied darker than the second background 21 ″, and the characters “copy” are raised. Therefore, it is possible to determine that the second copy P2 is produced by unauthorized copying.

  As described above, the copy prevention printed matter P was formed on the first background 11 and the first background 11 having the first pattern 12 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 12 has a portion having a higher density than the first background 11 and a portion having a lower density than the first background 11 adjacent to each other. The second background 21 and the second pattern 22 have different screen line numbers of halftone dots and the same or almost the same screen density. When copying at a density lower than the first density, the first copy prevention unit 1 If the second pattern 22 of the second copy preventing unit 2 is copied darker than the second background 21 when not copied and copied at a second density higher than the first density, the copy with improved performance is copied. Even if copied by a machine It is possible to determine that the shooting.

  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" ... 1st background 11a ... Outer part 11b ... Inside part 12, 12 "... 1st pattern 12a ... Dark part 12b ... Thin part 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 (1)

A first copy preventing portion having a first background having the same screen density and a first pattern which is formed on the first background and can be visually confirmed ;
A second copy prevention unit having a second background and a second pattern formed on the second background;
With
The first pattern has a gradation that changes darkly from the screen density of the first background and a gradation that changes lightly from the screen density of the first background , and
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 copying at a first density or lower, the first copy prevention unit is not copied,
The copy-preventing printed matter, wherein the second pattern of the second copy prevention unit is copied darker than the second background when copied at a second density that is darker than the first density.

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