JP2005266041A - Display body including concealed pattern by optical diffraction structure and its discrimination tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display body including a concealed pattern by optical diffraction structure in which the visual discrimination of the pattern is made extremely difficult and a forgery preventing effect is made superior, and to provide its discrimination tool. <P>SOLUTION: The display surface 2 of the display body including the optical diffraction structure is constituted of double structure having stripe pairs 6 of first and second linear stripes 6<SB>1</SB>and 6<SB>2</SB>which are adjacent to each other and parallel with each other and have different diffraction characteristics, and diffraction gratings 7<SB>1</SB>and 7<SB>2</SB>which constitute the linear stripes 6<SB>1</SB>and 6<SB>2</SB>. By making the tilt angles β1 and β2 of the diffraction gratings 7<SB>1</SB>and 7<SB>2</SB>and the tilt angle α of the stripe pair 6 in pattern areas X and Y the same as each other and making the pitches d<SB>1</SB>and d<SB>2</SB>of the stripe pair 6 therein different from each other, it is difficult to discriminate the concealed pattern X or Y in a visually confirming state but the pattern X or Y can be discriminated by superposing the discrimination tool composed of a transparent part and an opaque part having the same pitch as the pitch d<SB>1</SB>or d<SB>2</SB>of the stripe pair 6 of the concealed pattern on the display surface. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a hidden pattern by a light diffraction structure and a discriminator therefor, and particularly to a hidden pattern by a light diffraction structure that is difficult to discriminate in a normal visual state and a discriminator therefor.

  In recent years, forgery cases of high-value banknotes and gift certificates using color copiers have frequently occurred. For this reason, high-value banknotes and gift certificates have a small halftone dot or fine line that cannot be read by a color copier sensor in a part of the design, and is incorporated in a pattern designed with the same reflection density. As a result, when trying to copy these high-value banknotes and gift certificates with a color copier, the copier scanner reads out small dots and fine lines, and those parts are identified as white and are identified as copies. .

  In addition, a method of discriminating a copy product by providing a brilliant metal part in a part of the design of the printed material is also implemented.

  Since such a metal portion reflects 100% of incident light, the copying machine reproduces this portion in black. As an example, for example, a gold thread is sewed on the surface layer of paper, and copy check is performed.

  In addition, the metal diffractive surface of the light diffraction structure replicated with a transparent resin is subjected to metal vapor deposition, thermally transferred to a part of the printing area, and the copying by the copying machine is restrained. This light diffractive structure is used as a means for preventing counterfeiting of a printed matter or product itself that has been thermally transferred, while trying to check fraud due to copying by the reflection effect of the metal surface. The light diffractive structure is often used as a forgery prevention means such as a cash voucher because it requires an advanced manufacturing technique.

  However, improvement in manufacturing technology has made it possible to manufacture an optical diffraction structure that is close to the real thing at first glance.

  In order to check such counterfeit products, a technique has been proposed in which a hidden pattern that is difficult to discriminate is incorporated into a light diffraction structure and used as a means of authenticity discrimination. There is a problem that it is discriminated, and since there is no other pattern formed in the part where the hidden pattern is formed, it is assumed that there is a hidden pattern, and there is a problem of reducing the forgery prevention effect there were.

  In such a background, the present applicant, in Japanese Patent Application No. 2003-161644, can visually observe a normal display pattern due to a difference in configuration of each region of the linear diffraction grating in a visual state, but it is difficult to distinguish a hidden pattern. A display body that includes a hidden pattern of an optical diffraction structure that can discriminate a hidden pattern instead of a normal display pattern by superimposing discriminators is proposed.

The proposed invention
○ Have multiple patterns in the light diffraction structure,
○ Each pattern is formed by parallel stripes adjacent to each other,
○ The diffraction grating pitch or inclination angle of the adjacent first stripe and the second stripe is different,
○ By making the inclination angles of each pair of stripes constituting each pattern different, the hidden pattern coexists in the light diffraction structure (diffraction grating),
O Hidden patterns are discriminated by discriminating with a discriminator consisting of a transparent part and an opaque part having the same pitch as the stripe pair.

  The present invention has been made in view of the current state of the prior art, and an object of the present invention is to provide a display body including a hidden pattern with a light diffraction structure that is extremely difficult to visually discriminate and has a large anti-counterfeit effect, and for the same It is to provide a discriminator.

The display body including the hidden pattern by the light diffraction structure of the present invention that achieves the above object is a display body including the light diffraction structure, and the display surface has different diffraction characteristics and has an arbitrary outer shape according to the display pattern. And a plurality of pattern areas having an inner shape are arranged in parallel, and each pattern area is adjacent to and parallel to each other, and is filled by repeating a pair of stripes of the first and second linear stripes having different diffraction characteristics. The first straight stripe is constituted by a first linear diffraction grating, and the second straight stripe is constituted by a second linear diffraction grating, and a reference line set with respect to the display surface is formed. On the other hand, the inclination angle of the first linear stripe and the second linear stripe is the inclination angle α of the stripe pair, the inclination angle of the first linear diffraction grating is the inclination angle β ₁ of the first linear diffraction grating, and the second linear diffraction. The tilt angle of the second linear diffraction grating When β ₂
The inclination angle α of the stripe pair of the pattern area that constitutes at least one hidden pattern in the plurality of pattern areas is an angle of the stripe pair of the pattern area other than the pattern area that constitutes the hidden pattern adjacent to the pattern area. It is set to be equal to the inclination angle α, and the repetition pitch of the stripe pair is set to be different from each other, and the inclination angle β ₁ and the second inclination angle of the first linear diffraction grating in the pattern area constituting the hidden pattern are set. The inclination angle β ₂ of the linear diffraction grating is the inclination angle β ₁ of the first linear diffraction grating and the inclination angle β ₂ of the second linear diffraction grating in the pattern area other than the pattern area constituting the hidden pattern adjacent to the pattern area. And are set equal to each other.

In this case, the pattern area constituting the hidden pattern is composed of one or more isolated pattern areas, and the inclination angle α of the stripe pair of the one or more isolated pattern areas constituting the hidden pattern is the isolated It is set to be equal to the inclination angle α of the stripe pair in the pattern area adjacent to one or more pattern areas, and the repetition pitch of the stripe pair is set to be different from each other, and constitutes the hidden pattern The inclination angle β ₁ of the first linear diffraction grating and the inclination angle β ₂ of the second linear diffraction grating of the pattern region to be processed are the inclination of the first linear diffraction grating of the pattern region adjacent to the one or more isolated pattern regions. The angle β ₁ and the inclination angle β ₂ of the second linear diffraction grating can be set equal to each other.

Further, the pattern area constituting the hidden pattern includes a plurality of pattern areas adjacent to each other, and the inclination angle α and the pitch of the stripe pairs of the plurality of adjacent pattern areas constituting the hidden pattern are both Between the plurality of pattern areas adjacent to each other that are set to be equal to the inclination angle α and the pitch of the stripe pair of the pattern area adjacent to the plurality of pattern areas adjacent to each other and that constitute the hidden pattern. The inclination angle β ₁ of the first linear diffraction grating and the inclination angle β ₂ of the second linear diffraction grating can be set to be different from each other.

  Further, the first linear diffraction grating and the second linear diffraction grating in each of the plurality of pattern regions arranged in parallel adjacent to each other may satisfy at least one of different inclination angles or different grating pitches. It is desirable that it is set.

  In addition, it is desirable that the repetitive pitch of the stripe pairs in each of the plurality of pattern regions arranged in parallel to each other is set to 1/5 mm or less.

  In addition, it is desirable that the difference in the repetition pitch of the stripe pair between the pattern regions having different repetition pitches of the stripe pair is set to 1/50 mm or more.

  Further, it is preferable that the pattern area constituting the at least one hidden pattern is bordered by a stripe pair having a period shifted by a half period with respect to the period of the stripe pair constituting the pattern area.

  The first linear diffraction grating and the second linear diffraction grating are preferably composed of a reflective diffraction grating.

  Moreover, the display body which includes the hidden pattern by the light diffraction structure of this invention can be comprised in a transfer foil form, a label form, or a film form.

  The present invention is a discriminating tool for a display body including a hidden pattern by any one of the above light diffraction structures, which is a repetitive pattern of parallel straight transparent portions and straight opaque portions, And a discriminator having a pattern having the same inclination angle and the same repetitive pitch as the stripe pair of the pattern area constituting at least one hidden pattern in the plurality of pattern areas.

  In this case, it is desirable that the width of the linear transparent portion is set smaller than the width of the linear opaque portion.

According to the present invention,
○ Have multiple patterns in the light diffraction structure of the display,
○ Each pattern is formed by parallel stripes adjacent to each other,
○ The diffraction grating pitch or inclination angle of the adjacent first stripe and the second stripe is different,
○ By making the inclination angle of each stripe pair constituting each pattern the same and making the pitch different, the hidden pattern coexists in the light diffraction structure (diffraction grating),
○ Hidden patterns are discriminated by discriminating with a discriminator consisting of a transparent part and an opaque part with the same pitch and the same inclination angle as each stripe pair,
I did so
(1) Since the stripe pairs forming the pattern have different pitches but the same inclination angle, at first glance, it is difficult to understand that a hidden pattern is hidden in the optical diffraction structure. And hidden information can be tuned to the light diffractive structure.

  (2) When the display body of the present invention is observed with a discriminator composed of a transparent portion and an opaque portion having the same pitch as any of the pitches of each stripe pair constituting each pattern, the discriminator and the light diffraction structure As a result, the hidden pattern can be recognized as a specific character / pattern.

  (3) If the pitch of each stripe pair constituting each pattern is within 1/5 mm at the maximum, the stripe pattern cannot be recognized as a stripe as long as each stripe pair is visually observed, so a hidden pattern is hidden in the light diffraction structure. It is very difficult to understand that the product has been exposed, and a high anti-counterfeiting effect can be expected.

  (4) If the difference in pitch of each stripe pair constituting each pattern is 1/50 mm or more, the hidden pattern can be easily recognized when the light diffraction structure is observed with one pitch discriminator.

  As described above, it is possible to obtain a display body that includes a hidden pattern that is extremely difficult to visually discern, has a large effect of preventing forgery, and has high design.

  Hereinafter, a hidden pattern and a discriminator therefor according to the light diffraction structure of the present invention will be described with reference to the drawings.

  FIG. 1 is a view for explaining an example of a printed material to which a light diffraction structure having a hidden pattern according to the present invention is transferred as one embodiment of the present invention. A display body 1 including a hidden pattern for checking forgery or copying is formed at a predetermined position of the printed matter 10. In this case, the display body 1 is formed on a printed material 10 such as paper as a label with a heat-reactive adhesive after an extremely thin resin with unevenness is melted to a predetermined size by heat.

  Alternatively, it is punched into a predetermined size in a state where the light diffraction structure is formed on the base film, and is formed on the printed material 10 together with the base film by an adhesive or an adhesive.

  Many printed materials on which such a display body 1 is formed are difficult to be counterfeited or copied, for example, banknotes, gift certificates, admission tickets, gift certificates, bills, checks, and the like. In addition, the printing itself incorporates a technique that cannot be duplicated without a special technique, and is double protected against forgery and misuse by copying.

  The display surface 1 is composed of a partial display surface 2 including a hidden pattern and another partial display surface 3. Even if both the partial display surface 2 and the partial display surface 3 are display surfaces having a light diffraction structure, the hidden pattern is displayed. Only the partial display surface 2 including the light diffraction structure may be a display surface, and the other partial display surface 3 may be a display surface not based on the light diffraction structure such as printing. Of course, the display surface 3 may consist only of the partial display surface 2 including the hidden pattern by the light diffraction structure.

Here, the basic configuration of the light diffraction structure used for the partial display surface 2 in the present invention will be described with reference to FIG. In FIG. 2, the partial display surface 2 is composed of pattern areas X and Y (two in this case) having arbitrary outer shapes and inner shapes according to the display pattern. parallel and adjacent to a, it is filled by a different first and straight stripe ₆₁ repetitions of the second linear stripes 6 ₂ stripes pairs 6 diffraction characteristics, the first linear stripes 6 ₁ first linear diffraction grating 7 ₁ , and the second linear stripe 6 ₂ is configured by a second linear diffraction grating 7 ₂ . The first straight line fringe 6 _1, an inclination angle α with respect to the second straight stripes 6 _second reference line S, the inclination angle beta ₁ with respect to the first linear diffraction grating ₇₁ of the reference line S, the second linear diffraction grating 7 ₂ An inclination angle with respect to the reference line S is β ₂ . Here, as the reference line S, for example, a straight line parallel to the direction recognized as horizontal with respect to the display pattern of the display surface 2, for example, the long side direction of the display surface 2 is used. Note that the inclination angles of the diffraction gratings 7 ₁ and 7 ₂ are angles of the grating lines with respect to the reference line S.

In this figure 2, the pattern area X and the pattern region Y, the inclination angle alpha, the first linear diffraction grating ₇₁ inclination angle beta ₁ of the stripe pair 6 (first straight line fringe 6 ₁ and the second linear stripes 6 ₂₎ , the inclination angle beta ₂ of the second linear diffraction grating 7 ₂ are set the same.

Here, the repetition pitch of the stripe pair 6 in the pattern area X is d ₁ , the repetition pitch of the stripe pair 6 in the pattern area Y is d _2, and the repetition pitch d ₁ of the stripe pair 6 in the pattern area X and the stripe in the pattern area Y Consider a case where the repetition pitch d _{2 of} pair 6 is set to be different (d ₁ ≠ d ₂ ). As shown in the plan view of FIG. 3, the partial display surface 2 has a repeating pattern of parallel linear transparent portions 9 ₁ and linear opaque portions 9 _2, and the repetition pitch is a pattern of the partial display surface 2. has the same d ₁ and repetition pitch of the stripe pair 6 region X, the linear transparent portion 9 _1, the inclination angle with respect to the reference line S of the straight opaque portion 9 _2, pattern area X, the first straight line fringe 6 ₁ Y the determination device 8 is the same as the inclination angle α with respect to the reference line S of the second linear stripes 6 ₂ stripes pairs 6, when superimposed in proximity or contact to the partial display surface 2, the pattern region X in the repeating stripe pair 6 since matching the pitch d ₁ and repetition pitch d ₁ of the linear transparent portion 9 _first determination device 8, based on the phase difference between a first straight line fringe 6 ₁ in the entire pattern region X second straight stripes 6 ₂ It will transmit linearly transparent portion 9 _first determination device 8 at the same rate. For Figure 3, in the pattern region X, look through the linear transparent portion 9 _first determination device 8, a diffraction grating ₇₁ which for the most part constitutes the first straight line fringe 6 _1, second linear diffraction grating 7 ₂ constituting the stripe 6 ₂ is almost invisible. Therefore, the light diffracted by the diffraction grating 7 ₁ The corresponding diffraction direction, appears as a bright pattern pattern region X entire surface of the same brightness, appear dark in the other direction. The probability that the discriminator 8 overlaps so that the linear transparent portion 9 ₁ of the discriminator 8 passes through the diffraction grating 7 ₁ and the diffraction grating 7 ₂ exactly half each is very small. The diffracted light from the diffraction grating 7 ₁ appears as a bright pattern having the same brightness in either the corresponding diffraction direction or the diffracted light from the diffraction grating 7 ₂ corresponds, and appears dark in the other directions. .

On the other hand, in the pattern region Y, the repeat pitch d ₂ of the stripe pair 6 is different from the repeat pitch d ₁ of the straight transparent portion 9 ₁ of the discriminator 8, so that the linear transparency of the discriminator 8 is shown in FIG. look through the section 9 ₁ is the same proportion as the diffraction grating 7 ₁ as a whole and the diffraction grating 7 _2. If therefore, the light diffracted by the diffraction grating 7 ₁ In the diffraction direction of the diffraction light corresponding with the corresponding direction of diffraction and the diffraction grating 7 _2, the diffraction grating 7 _1, 7 or one of the only _two are visible (pattern region X) It will be visible at about half the brightness.

That is, when the repetition pitch d ₂ of stripe pairs 6 repetition pitch d ₁ and the pattern area Y of the stripe pair 6 of the pattern region X is different from (d ₁ ≠ d ₂₎ is repetitive pitch of the linear transparent portion 9 ₁ any If the same discriminating tool as the repeated pitch of the stripe pair 6 of the pattern region X or Y is overlapped, one of the pattern regions X or Y is brighter depending on the observation direction. Since the other looks darker and contrasts with each other, the pattern area X and the pattern area Y appear to be distinguishable from each other.

Above, have an inclination angle of the diffraction grating ₇₁ which constitutes the diffraction grating 7 _1, 7 ₂ and stripes pairs 6 of the pattern region Y which constitutes the stripe pair 6 of the pattern region X in FIG. 2, 7 ₂ is different from Is the same. However, in this case, the pattern region X and the pattern region Y appear to be distinguishable from each other because the diffraction direction of the pattern region X and the diffraction direction of the pattern region Y are different without overlapping discriminators.

As described above, the partial display surface 2 including the hidden pattern by the light diffraction structure of the present invention has the linear diffraction gratings 7 ₁ and 7 ₂ and the first linear stripes 6 ₁ and 2 constituted by these linear diffraction gratings. The linear stripe 6 ₂ has a double structure with the stripe pair 6, the inclination angles β ₁ and β ₂ of the linear diffraction gratings 7 ₁ and 7 ₂ , and the inclination angle α of the stripe pair 6 are the same, and the stripe pair 6 includes the pattern regions X and Y having different pitches d ₁ and d ₂ , and is characterized by its double structure and pitch difference.

Here, the repetition pitches d ₁ and d ₂ of the stripe pair 6 are set to 1/5 mm or less, and the pitch difference | d ₁ −d ₂ | between the pattern areas X and Y to be distinguished is set to 1/50 mm or more. Is done. The first linear diffraction grating ₇₁ and the second linear diffraction grating 7 _2, the inclination angle is different (β ₁ ≠ β ₂₎ or, as the grating pitch of the diffraction grating satisfies at least one of or different Has been chosen. Of course, the grating pitch of the first linear diffraction grating 7 ₁ and the second linear diffraction grating 7 ₂ is set sufficiently smaller than the repetition pitch d of the stripe pair 6. Usually, the grating pitch of the diffraction gratings 7 ₁ and 7 ₂ is in the range of 0.5 μm to ₂ μm. Further, the difference in inclination angle | β ₁ −β ₂ | between the first linear diffraction grating 7 ₁ and the second linear diffraction grating 7 ₂ is not limited, but is set within a range of 30 ° to 90 °. desirable.

In the following description, the first linear stripe 6 ₁ , the second linear stripe 6 ₂ , the first linear diffraction grating 7 ₁ , and the second linear diffraction grating 7 ₂ will all be referred to as linear terms unless particularly necessary. It omits and calls the 1st fringe 6 ₁ , the second fringe 6 ₂ , the first diffraction grating 7 ₁ , and the second diffraction grating 7 ₂ .

FIG. 4 is an enlarged view of the partial display surface 2 including a hidden pattern by the light diffraction structure of the first embodiment according to the present invention. The partial display surface 2 includes an inner area A of a letter “A” and an area A. The surrounding area C,
Region A
Tilt angle of stripe pair 6: 45 °
Repetitive pitch of stripe pair 6: 0.1 mm
The first diffraction grating ₇₁ of the tilt angle: 0 °
The second diffraction grating 7 ₂ inclination angle: 45 °
Region C
Tilt angle of stripe pair 6: 45 °
Repeat pitch of stripe pair 6: 0.2 mm
The first diffraction grating ₇₁ of the tilt angle: 0 °
The second diffraction grating 7 ₂ inclination angle: 45 °
Is set to

Due to such an arrangement, on the partial display surface 2, the first diffraction grating 7 having an inclination angle of 0 ° in any region of the display surface 2 in a minute portion that is about the width of the larger stripe pair 6. _1, sequence by the ₂ second diffraction grating 7 of the tilt angle 45 ° is intended to include at the same rate, in the regions a and C, although the repetition pitch of the stripe pair 6 are different, the repetition pitch of the stripe-to 6 1 / Since they are set so as to satisfy 5 mm or less, they cannot be distinguished from each other in a normal visual state. Therefore, in a normal visual state without using a discriminator, the entire display surface 2 is observed in a state where there is no display pattern with uniform brightness, and the hidden character “A” cannot be discriminated.

Here, as shown in a plan view in FIG. 5, the pattern is a repeating pattern of parallel linear transparent portions 9 ₁ and linear opaque portions 9 _2, and the inclination angles of the linear transparent portions 9 ₁ and the linear opaque portions 9 ₂ are regions. When the discriminating tool 8 having an inclination angle of 45 ° equal to the inclination angle 45 ° of the stripe pair A and having a repetition pitch equal to 0.1 mm of the stripe pair 6 is brought close to or in close contact with the partial display surface 2 of FIG. As described with reference to FIG. 3, the area A and the area C are observed with contrast, and in this example, the hidden character “A” can be discriminated.

FIG. 6 is an enlarged view of the partial display surface 2 including a hidden pattern by the light diffraction structure of the second embodiment according to the present invention. The partial display surface 2 has a circular area in the square, and the circular area in the square. When are those depicting characters so as to partially overlap "a", the inner area a ₁ character located in the circular area of the letter "a", the inner area of the character located outside circular area a ₂ And an area O other than the letter “A” in the circle area, and an outer area D outside the circle area “A”.
Area A ₁
Tilt angle of stripe pair 6: 45 °
Repetitive pitch of stripe pair 6: 0.1 mm
The first diffraction grating ₇₁ of the tilt angle: 30 °
The second diffraction grating 7 ₂ tilt angle: 75 °
Area A ₂
Tilt angle of stripe pair 6: 45 °
Repetitive pitch of stripe pair 6: 0.1 mm
The first diffraction grating ₇₁ of the tilt angle: 0 °
The second diffraction grating 7 ₂ inclination angle: 45 °
Region O
Tilt angle of stripe pair 6: 45 °
Repeat pitch of stripe pair 6: 0.2 mm
The first diffraction grating ₇₁ of the tilt angle: 30 °
The second diffraction grating 7 ₂ tilt angle: 75 °
Region D
Tilt angle of stripe pair 6: 45 °
Repeat pitch of stripe pair 6: 0.2 mm
The first diffraction grating ₇₁ of the tilt angle: 0 °
The second diffraction grating 7 ₂ inclination angle: 45 °
Is set to

Due to such an arrangement, in the partial display surface 2, in a minute portion that is about the width of the larger stripe pair 6, the region A ₁ and the region O that are regions in the circle of the display surface 2 are both The first diffraction grating 7 ₁ having an inclination angle of 35 ° and the second diffraction grating 7 ₂ having an inclination angle of 75 ° are included in the same area, and the region of the display surface 2 is outside the circle. In any region A ₂ and region D, the first diffraction grating 7 ₁ having an inclination angle of 0 ° and the second diffraction grating 7 ₂ having an inclination angle of 45 ° are included at the same ratio in both regions. Although the repetition pitch of the stripe pair 6 is different in all cases, the repetition pitch of the stripe pair 6 is set to satisfy 1/5 mm or less, so that the region in the circle of the display surface 2 is uniform in a normal viewing state. The region outside the circle looks uniform, and the diffraction direction is different inside and outside the circle. It can be determined appeared in a state of Tsu. Therefore, in a normal visual state without using a discriminator, the display surface 2 is observed as a display pattern including a circle in a square, and the hidden character “A” cannot be discriminated.

Here, as shown in a plan view in FIG. 5, the pattern is a repeating pattern of parallel linear transparent portions 9 ₁ and linear opaque portions 9 _2, and the inclination angles of the linear transparent portions 9 ₁ and the linear opaque portions 9 ₂ are regions. The discriminating tool 8 having the same inclination angle 45 ° of the stripe pair 6 of A ₁ and the area A ₂ and the repetition pitch of which is equal to the repetition pitch of 0.1 mm of the stripe pair 6 of the areas A ₁ and A ₂ is shown in FIG. When the display surface 2 is close to or in close contact with the display surface 2, as described with reference to FIG. 3, the regions A ₁ and A ₂ appear brighter or darker depending on the observation direction, and the regions O and D are opposite. A relatively darker or brighter image is observed, and the regions A ₁ and A ₂ are observed with a contrast between the regions O and D. In this example, the hidden character “A” can be discriminated.

In this case, the brightness and color appear slightly different depending on the position of the illumination light source between the inner area A ₁ and the outer area A ₂ of the circle of the letter “A”. Therefore, the difference in brightness and color inside the character “A” does not disturb the determination of the hidden character “A”.

FIG. 7 is an enlarged view of the partial display surface 2 including a hidden pattern by the light diffraction structure of the third embodiment according to the present invention. The partial display surface 2 has a circular area in the square, and the circular area in the square. The character “A” and the character “B” are drawn in parallel so as not to overlap with each other, and the inner region A _{11 of the} character located in the circle region of the character “A” A character inner region A ₂₂ located outside the circle region, a character inner region B ₁₁ located inside the circle region of the character “B”, a character inner region B ₂₂ located outside the circle region, and a circle The region O ₁ other than the characters “A” and “B” in the region, and the outer region D ₁ of the characters “A” and “B” outside the circle region,
Area A ₁₁
Tilt angle of stripe pair 6: 45 °
Repeated pitch of stripe pair 6: 0.08 mm
The first diffraction grating ₇₁ of the tilt angle: 0 °
The second diffraction grating 7 ₂ inclination angle: 45 °
Region A ₂₂
Tilt angle of stripe pair 6: 45 °
Repeated pitch of stripe pair 6: 0.08 mm
The first diffraction grating ₇₁ of the tilt angle: 30 °
The second diffraction grating 7 ₂ tilt angle: 75 °
Region B ₁₁
Tilt angle of stripe pair 6: 45 °
Repeat pitch of stripe pair 6: 0.12 mm
The first diffraction grating ₇₁ of the tilt angle: 0 °
The second diffraction grating 7 ₂ inclination angle: 45 °
Region B ₂₂
Tilt angle of stripe pair 6: 45 °
Repeat pitch of stripe pair 6: 0.12 mm
The first diffraction grating ₇₁ of the tilt angle: 30 °
The second diffraction grating 7 ₂ tilt angle: 75 °
Region O ₁
Tilt angle of stripe pair 6: 45 °
Repetitive pitch of stripe pair 6: 0.16 mm
The first diffraction grating ₇₁ of the tilt angle: 0 °
The second diffraction grating 7 ₂ inclination angle: 45 °
Region D ₁
Tilt angle of stripe pair 6: 45 °
Repetitive pitch of stripe pair 6: 0.16 mm
The first diffraction grating ₇₁ of the tilt angle: 30 °
The second diffraction grating 7 ₂ tilt angle: 75 °
Is set to

Due to such an arrangement, in the partial display surface 2, regions A ₁₁ , B _11, and O ₁ that are regions within the circle of the display surface 2 are present in a minute portion that is about the width of the largest stripe pair 6. In any region, the first diffraction grating 7 ₁ having an inclination angle of 0 ° and the second diffraction grating 7 ₂ having an inclination angle of 45 ° are included in the same ratio, and the circle of the display surface 2 is included. in region a ₂₂ and the area B ₂₂ and the region D ₁ is outside the area, in any of the regions together, the first diffraction grating ₇₁ of the tilt angle 30 °, the second diffraction grating 7 ₂ of tilt angle 75 ° Are included at the same ratio, and the repetition pitch of the stripe pair 6 is different, but the repetition pitch of the stripe pair 6 is set to satisfy 1/5 mm or less. The area inside the circle is uniform, the area outside the circle appears uniform, and the diffraction pattern is inside and outside the circle. So is different, it can be determined look in different states to each other. Therefore, in a normal visual state without using a discriminator, the display surface 2 is observed as a display pattern including a circle in a square, and the hidden characters “A” and “B” cannot be discriminated.

FIG. 8 is a diagram showing a process of discriminating hidden characters “A” and “B” from the partial display surface 2 of FIG. 7 (FIG. 8A). As shown in FIG. The linear transparent portion 9 ₁ and the linear opaque portion 9 ₂ have a repetitive pattern, and the linear transparent portion 9 ₁ and the linear opaque portion 9 ₂ have an inclination angle 45 of the stripe pair 6 in the region A ₁₁ and the region A _22. ° to equal the repetition discriminating device ₈₁ equal to the pitch 0.08mm stripe pair 6 of the repetition pitch region a ₁₁ and the area a _22, the superposed proximate or intimate contact with the partial display surface 2 in FIG. 7, As described with reference to FIG. 3, the regions A ₁₁ and A ₂₂ look brighter or darker depending on the viewing direction, and the other regions B ₁₁ , B ₂₂ , O ₁ , and D ₁ are relatively opposite. observed brighter than or dark regions a _11, a ₂₂ and the area _{B 11, B 22, O 1} , mutually contra between D ₁ Observed with a preparative, as shown in the right of FIG arrow of FIG. 8 (b), the hidden characters "A" is possible to identify. Note that the brightness and color look slightly different depending on the position of the illumination light source between the inner region A ₁₁ and the outer region A ₂₂ of the circle of the letter “A”. Since there is a surface light source, the difference in brightness and color inside the character “A” does not disturb the determination of the hidden character “A”.

Next, as shown in FIG. 8C, a repeating pattern of parallel linear transparent portions 9 ₁ and linear opaque portions 9 _2, and the inclination angles of the linear transparent portions 9 ₁ and the linear opaque portions 9 ₂ are regions. B ₁₁ and equal to the tilt angle 45 ° stripe pair 6 of region B _22, the repetition pitch of the region B ₁₁ and the region determination device 8 ₂ equal to the repetition pitch 0.12mm stripe pairs 6 B _22, in FIG. 7 superposition close to or in close contact with the partial display surface 2, as described with reference to FIG. 3, region B _11, B appear dark or brighter according to ₂₂ in the viewing direction, the other regions a _11, On the other hand, A ₂₂ , O ₁ , and D ₁ are observed to be relatively darker or brighter, and the regions B ₁₁ and B ₂₂ are observed with contrast between the regions A ₁₁ , A ₂₂ , O ₁ , and D _1. As shown in the figure on the right side of the arrow in FIG. 8C, the hidden character “B” can be discriminated. . Note that the brightness and color appear slightly different depending on the position of the illumination light source between the inner region B ₁₁ and the outer region B ₂₂ of the circle of the letter “B”. Since there is a surface light source, the difference in brightness and color inside the letter “B” does not disturb the determination of the hidden letter “B”.

Next, as shown in FIG. 8 (d), a repeating pattern of parallel linear transparent portions 9 ₁ and linear opaque portions 9 ₂ , wherein the inclination angles of the linear transparent portions 9 ₁ and the linear opaque portions 9 ₂ are regions. O ₁ and equal to the inclination angle 45 ° stripe pair 6 of region D _1, the repetition pitch of the area O ₁ and region D ₁ of the determination device 8 ₃ equal to the repetition pitch 0.16mm stripe pairs 6, 7 When they are brought close to or in close contact with the partial display surface 2, as described with reference to FIG. 3, the regions O ₁ and D ₁ appear brighter or darker depending on the observation direction, and other regions A ₁₁ , A ₂₂ , B ₁₁ , and B ₂₂ are observed to be relatively darker or brighter, and the hidden character “AB” can be discriminated as shown in the diagram to the right of the arrow in FIG. It should be noted that although the brightness and color look slightly different depending on the position of the illumination light source between the region O ₁ and the region D ₁ outside the hidden character “AB”, many light sources and surface light sources are used in a normal viewing environment. Therefore, the difference in brightness and color outside of the “hidden character“ AB ”does not disturb the determination of the hidden character“ AB ”.

By the way, a pattern (circle pattern in FIGS. 6 and 7) that can be discriminated in a normal visual state without using a discriminator, a hidden pattern (a character pattern “A” in FIGS. 4, 6 and 7, “ As shown in FIG. 9, a border P ′ is formed around each pattern P by a pair of fringes having a period shifted by a half period from the period of the pair of stripes 6 constituting the pattern P. It can also be formed. By applying such a border P ′, when a hidden pattern that is difficult to discriminate is discriminated using the discriminating tools 8, 8 ₁ , 8 ₂ , and 8 ₃ , the discriminating pattern can be easily discriminated. There is an effect of making the boundary clearer.

In the above description, the first diffraction grating 7 ₁ and the second diffraction grating 7 ₂ constituting the fringe pair 6 have different inclination angles (β ₁ ≠ β ₂ ), or at least the grating pitch of the diffraction grating is different. Although the selection is made so as to satisfy one of them, the effect of the hidden pattern can be further enhanced by making the two elements of the inclination angle and the lattice pitch different from each other.

In the above description, the discriminators 8, 8 ₁ , 8 ₂ , and 8 ₃ are repetitive patterns of parallel linear transparent portions 9 ₁ and linear opaque portions 9 _2, and the repetitive pitch is any of the display surfaces 2. have the same pitch as the repetitive pitch in the area of the hidden pattern stripes pairs 6, linear transparent portion 9 _1, the inclination angle with respect to the reference line S of the straight opaque portion 9 _2, the inclination angle of the fringes versus 6 regions hidden pattern However, when the discriminators 8, 8 ₁ , 8 ₂ , and 8 ₃ are brought close to the printed material 10 at a predetermined angle, the discriminating device 8 discriminates according to the phenomenon described in FIG. A hidden pattern is displayed via the tools 8, 8 ₁ , 8 ₂ , 8 ₃ . When the hidden pattern displayed via the discriminators 8, 8 ₁ , 8 ₂ , and 8 ₃ is a predetermined pattern, the printed product is a legitimate product (genuine product) supplied from the correct supplier. Determined.

The discriminating tools 8, 8 ₁ , 8 ₂ , and 8 ₃ have a discriminating pattern formed on a transparent base substrate because the observer must be able to visually observe the light that has passed through the discriminating tool and has been applied to the hidden pattern of the printed matter. Is used. The base substrate is preferably higher in transparency. Further, since the discriminating tools 8, 8 ₁ , 8 ₂ , and 8 ₃ are frequently used, a base substrate fixed with a strong frame material is often used. A handle or the like can be attached to the frame member, thereby preventing the transparent base substrate of the discriminating tools 8, 8 ₁ , 8 ₂ , and 8 _{3 from} being stained with fingerprints or oil.

When determining the hidden pattern, the determination tools 8, 8 ₁ , 8 ₂ , and 8 ₃ are determined so as to be close to the printed material 10 on which the display body 1 is formed. Although the hidden pattern can be discriminated from the close contact state to a certain distance, the distance between the display body 1 and the discriminating tools 8, 8 ₁ , 8 ₂ , 8 ₃ is not available because the moire phenomenon is used. If too much, it becomes difficult to distinguish.

By the way, the discriminators 8, 8 ₁ , 8 ₂ , and 8 ₃ are parallel patterns in which the inclination angle of the linear transparent portion 9 ₁ and the linear opaque portion 9 ₂ (FIG. 5) with respect to the reference line S is a predetermined angle α. Can be configured. The line is a repetitive pattern in which the linear transparent portion 9 ₁ and the colored linear opaque portion 9 ₂ are paired, and the width of the transparent transparent transparent portion 9 _{1 and} the width of the colored linear opaque portion 9 ₂ are May be the same or different.

Incidentally, it is possible by dot patterns in place of such a line pattern, constituting a discrimination tool 8,8 _1, 8 _2, 8 _3. A directional halftone dot is composed of a point where a transparent part and a colored part are independent, or two points connected in a chain, and a line connecting the transparent parts (a chain) , connecting the colored portion becomes (chain) line pair, discrimination pattern is formed corresponding to the linear transparent portion 9 ₁ and the linear opaque portion 9 _2.

By the way, as the discriminator 8 (8 ₁ , 8 ₂ , 8 ₃ ), as shown in FIG. 5 or FIG. 8, a discriminating pattern composed of a repeating pattern of parallel straight transparent portions 9 ₁ and straight opaque portions 9 ₂ is used. , as an enlarged view of a part of the repeating pattern in FIG. 10, when the width of the linear transparent portion 9 ₁ a, the width of the linear opaque portion 9 _2, b, a / b ≒ 1, i.e., The straight transparent portion 9 ₁ and the straight opaque portion 9 ₂ may have substantially the same width, but a / b is in the range of 2/3 to 1/4, that is, the width of the straight transparent portion 9 ₁ is equal to that of the straight opaque portion 9 ₂ . It is desirable to set it smaller than the width. The reason is that in the range of 2/3 ≧ a / b ≧ 1/4, when the discriminating tool 8 is superimposed on the display surface 2 close to or in close contact, the hidden patterns “A”, “B”, “AB” Is observed with good contrast. On the other hand, if a / b exceeds 2/3, the amount of light that can be seen through the discriminator 8 becomes too bright and too bright, and the contrast decreases, making it difficult to see the hidden pattern. This is because if it is less than / 4, the amount of light is so small that it becomes dark and it becomes difficult to see the hidden pattern.

In the above description, the diffraction gratings 7 ₁ and 7 ₂ constituting the light diffraction structure of the display surface 2 of the display body 1 have not been described in detail. Usually, as the diffraction grating used for the display surface 2 that is attached to a printed material or the like, a reflection type diffraction grating is used in which a metal reflective film is provided on the relief surface or plane of the relief grating having an uneven relief structure by vapor deposition or the like. Other than that, it is a reflective type in which a metal reflective film is provided on the back surface of an amplitude type diffraction grating whose amplitude changes periodically or a refractive index changes periodically to form a phase type diffraction grating. A diffraction grating having a diffraction grating composed of interference fringes in a volume type photosensitive material or the like may be used.

  Of course, the display surface 2 may be formed of a transmissive type instead of the reflective type, and the diffraction grating may be formed of a transmissive diffraction grating.

  Now, the display body 1 (or only the display surface 2) having the partial display surface 2 including the above-described hidden pattern according to the present invention can be configured in various forms such as a transfer foil, a label, and a film. In the case of a transfer foil form, it can be applied to, for example, gift certificates, credit cards, packages, etc., in the case of a label form, it can be applied to packages such as software, cartridges, pharmaceuticals, etc., and in the case of a film form, For example, the film can be micro-slit to a width of about 1 to 2 mm, and the sheet can be made into paper together to prevent forgery. In the case of the label form, a brittle layer is interposed in the layer structure, and when the label is peeled off for counterfeiting, the label is peeled off from the brittle layer, and the display body is peeled off for counterfeiting. Can be difficult (brittle label). Hereinafter, an example of a layer configuration and a manufacturing process thereof when the display body including the hidden pattern by the light diffraction structure of the present invention is configured in each form of a transfer foil, a label, a brittle label, and a film will be described.

  FIG. 11 is a cross-sectional view showing a layer structure when a display body containing a hidden pattern by the light diffraction structure of the present invention is configured as a transfer foil 31. The structure will be described according to the manufacturing method. A release layer 45 is applied on a substrate 44 made of a resin film, a diffraction grating forming layer 41 is applied on the release layer 45, and a diffraction grating original plate having an uneven relief structure is embossed on the diffraction grating forming layer 41. A diffraction grating having a relief structure is duplicated, and a reflective layer is deposited on the duplicated relief diffraction grating surface to form a reflective diffraction grating 43, and a heat seal layer is formed on the reflective layer side of the diffraction grating 43. 46 is applied to complete a transfer foil 31 having a layer structure as shown in FIG.

  Here, as a resin film which comprises the base material 44, a polypropylene resin film, a polycarbonate resin film, or a polyethylene terephthalate resin film etc. are preferable, and in addition to these, biaxially-stretched polyethylene terephthalate resin excellent in mechanical strength. Film is suitable.

  Further, the resin constituting the release layer 45 depends on the material of the base material 44 and the material of the diffraction grating forming layer 41 adhered to the release layer 45, but the polyester resin, the acrylic skeleton resin, and the vinyl chloride-vinyl acetate copolymer. A resin, a two-component blend resin of cellulose acetate and a thermosetting acrylic resin, a melamine resin, or a nitrocellulose resin can be used. For example, when the base material 44 is a polyethylene terephthalate resin (PET) film, a polyester resin is preferable in terms of the adhesion between the release layer 45 and the base material 44. To these resins, a wax such as polyethylene wax or a silicone resin may be added to improve the peelability. The release layer 45 is prepared by dissolving or dispersing the above resin using an appropriate solvent or dispersant, and preparing a composition suitable for coating or printing by using a known coating method or printing method. Can be laminated.

  Moreover, as a synthetic resin which comprises the diffraction grating formation layer 41, thermoplastic resins, such as polyvinyl chloride, an acrylic resin (for example, PMMA), a polystyrene, a polycarbonate, unsaturated polyester, melamine, an epoxy, polyester (meth) acrylate, Thermosetting resins such as urethane (meth) acrylate, epoxy (meth) acrylate, polyether (meth) acrylate, polyol (meth) acrylate, melamine (meth) acrylate, triazine acrylate, etc. each alone or the above thermoplastic resin And thermosetting resin can be used as a mixture, and furthermore, thermoforming materials having radically polymerizable unsaturated groups, or radically polymerizable unsaturated monomers added to these, and ionizing radiation curable Can be used. In addition, photosensitive materials such as silver salt, dichromated gelatin, thermoplastic, diazo photosensitive material, photoresist, ferroelectric, photochromic material, thermochromic material, chalcogen glass, and the like can be used.

  Formation of the concavo-convex relief structure diffraction grating on the synthetic resin layer can be formed by a conventionally known method using the above-described materials. For example, by using an original plate in which the diffraction grating is recorded in a concavo-convex shape as a press mold, the original plate is overlaid on the resin layer and heated and pressure-bonded by an appropriate means such as a heating roll, whereby the concavo-convex pattern of the original plate is formed. Can be duplicated. Alternatively, the original plate can be superimposed on an ultraviolet curable resin layer, and the resin layer can be cured by irradiating ultraviolet rays to reproduce the concave / convex pattern of the original plate.

  As a material constituting the reflective layer 42, Mg, Al, Ti, Cr, Cu, Zn, Ga, Ge, Se, Rb, Pd, Ag, Cd, In, Sn, Sb, Te, Au, Pb, or A metal such as Bi or an oxide thereof or a nitride thereof is used alone or in combination to form a thin film. Among these, when a metal thin film layer is used as the reflective layer 42, Al, Cr, Ni, Ag, Au, or the like is particularly preferable.

  The reflective layer 42 is formed by a known thin film forming method such as a vacuum deposition method, a sputtering method, or an ion plating method.

  Examples of the material constituting the heat seal layer 46 include an ethylene-vinyl acetate copolymer resin, a polyamide resin, a polyester resin, a polyethylene resin, an ethylene-isobutyl acrylate copolymer resin, a butyral resin, polyvinyl acetate, and a copolymer thereof. A coalesced resin, a cellulose derivative, a polymethyl methacrylate resin, a polyvinyl ether resin, a polyurethane resin, a polycarbonate resin, a polypropylene resin, an epoxy resin, or a phenol resin can be used. Alternatively, thermoplastic elastomers such as SBS (styrene-butadiene-styrene block copolymer), SIS (styrene-isoprene-styrene block copolymer), SEBS (styrene-ethylene-butylene-styrene block copolymer), or reactive hot melt resins May be used.

  FIG. 12 is a cross-sectional view showing a layer structure in the case where a display body containing a hidden pattern by the light diffraction structure of the present invention is configured as a label 32. The structure will be described according to the manufacturing method. Transparent resin such as PET A diffraction grating forming layer 41 is coated on a substrate 44 made of a film, and a diffraction grating original plate having an uneven relief structure is embossed on the diffraction grating forming layer 41 to replicate the diffraction grating having the uneven relief structure, and the replicated relief A reflective diffraction grating 43 is formed by vapor-depositing a reflective layer 42 on the diffraction grating surface, an adhesive layer 47 is applied to the reflective layer 42 side of the diffraction grating 43, and the adhesive layer 47 is used for protection. A separator (release paper) 48 is laminated to complete a label 32 having a layer structure as shown in FIG.

  Here, the materials constituting the substrate 44, the diffraction grating formation layer 41, and the reflection layer 42 are the same as those in the case of FIG.

  As an adhesive constituting the adhesive layer 47, polyvinyl acetate resin, polyvinyl alcohol, polyvinyl acetal (polyvinyl formal, polyvinyl butyral, etc.), cyanoacrylate, polyvinyl alkyl ether, polyvinyl chloride, polyamide, polymethyl methacrylate, nitrocellulose , Cellulose acetate, thermoplastic epoxy, polystyrene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, urea resin, melamine resin, phenol resin, resorcinol resin, furan resin, epoxy resin, unsaturated polyester resin, polyurethane resin, Polyimide, polyamideimide, polybenzimidazole, polybenzothiazole, etc., or rubber-based natural rubber, recycled rubber, styrene-butadiene rubber, acrylo Tolyl - butadiene rubber, chloroprene rubber, butyl rubber, polysulfide rubber, silicone rubber, polyurethane rubber, stereo rubber (synthetic natural rubber), ethylene-propylene rubber, block copolymer rubbers (SBS, SIS, SEBS, etc.) can be used.

  Further, as the separator (release paper) 48, a conventionally known paper or a film substrate subjected to a release treatment can be used.

  FIG. 13 is a cross-sectional view showing a layer structure in the case where the display body containing the hidden pattern by the light diffraction structure of the present invention is configured as the brittle label 33. The structure will be described according to the manufacturing method. A brittle layer 49 is applied on a substrate 44 made of a transparent resin film, a diffraction grating forming layer 41 is applied on the brittle layer 49, and a diffraction grating original plate having an uneven relief structure is embossed on the diffraction grating forming layer 41. Then, the diffraction grating having the concavo-convex relief structure is duplicated, and a reflection type diffraction grating 43 is formed by vapor-depositing the reflection layer 42 on the duplicated relief diffraction grating surface, and the diffraction grating 43 is formed on the reflection layer 42 side. An adhesive layer 47 is applied, and a separator (release paper) 48 is laminated on the adhesive layer 47 to complete the brittle label 33 having a layer structure as shown in FIG.

  Here, the materials constituting the substrate 44, the diffraction grating forming layer 41, the reflective layer 42, the adhesive layer 47, and the separator (release paper) 48 are the same as those in FIG.

  As the material constituting the brittle layer 49, the same series as the resin constituting the release layer 45 in the case of FIG. 11 is used.

  FIG. 14 is a cross-sectional view showing a layer structure when a display body containing a hidden pattern by the light diffraction structure of the present invention is formed as a film 34. The structure will be described according to the manufacturing method. Transparent resin such as PET A diffraction grating forming layer 41 is coated on a substrate 44 made of a film, and a diffraction grating original plate having an uneven relief structure is embossed on the diffraction grating forming layer 41 to replicate the diffraction grating having the uneven relief structure, and the replicated relief A reflective diffraction grating 43 is formed by vapor-depositing a reflective layer 42 on the diffraction grating surface, and a film 34 having a layer structure as shown in FIG. 13 is completed.

  Here, the materials constituting the substrate 44, the diffraction grating formation layer 41, and the reflection layer 42 are the same as those in FIGS.

  Here, in FIG. 11 to FIG. 14, an example of a method for producing a diffraction grating original plate for embossing a diffraction grating having an uneven relief structure on the diffraction grating forming layer 41 will be briefly described. To do so, prepare a Cr-plated glass plate, apply an electron beam resist on it, draw a diffraction grating pattern by electron beam drawing, and then develop the electron beam resist to obtain a rectangular wave shape in cross section. An uneven relief structure is obtained.

  An ultraviolet curable resin or a thermosetting resin is applied onto the diffraction grating pattern of the concavo-convex relief structure of such an electron beam resist, and the concavo-convex relief structure is converted into an ultraviolet curable resin or a thermosetting resin by ultraviolet irradiation or heating. By duplicating, a negative version of the diffraction grating pattern for electron beam drawing is obtained. The negative plate is similarly duplicated to obtain a positive plate, or the positive plate obtained by repeating such duplication an even number of times is embossed with the diffraction grating having an uneven relief structure on the diffraction grating forming layer 41. It can be used as a diffraction grating original plate.

  As described above, the display body including the hidden pattern by the light diffraction structure of the present invention and the discriminating tool therefor have been described based on some embodiments. However, the present invention is not limited to these embodiments and can be variously modified. It is.

It is a figure for demonstrating an example of the printed matter which transferred the light diffraction structure which has a hidden pattern by this invention. It is a figure for demonstrating the basic composition of the light diffraction structure used for a partial display surface in this invention. It is a figure which shows a mode when a discriminator is piled up on the partial display surface of FIG. It is an enlarged view of the partial display surface containing the hidden pattern by the light diffraction structure of 1st Example by this invention. It is a top view of the discrimination tool for discriminating the hidden pattern in the partial display surface of FIG. It is an enlarged view of the partial display surface including the hidden pattern by the light diffraction structure of 2nd Example by this invention. It is an enlarged view of the partial display surface containing the hidden pattern by the light diffraction structure of 3rd Example by this invention. It is a figure which shows the process in which a hidden character is discriminate | determined from the partial display surface of FIG. It is a figure for demonstrating the border provided in the periphery of each pattern based on this invention. It is a figure for demonstrating the width | variety relationship of the discrimination | determination pattern which consists of a repeating pattern of a parallel linear transparent part and a linear opaque part. It is sectional drawing which shows the layer structure in the case of comprising as a transfer foil the display body which includes the hidden pattern by the light diffraction structure of this invention. It is sectional drawing which shows the layer structure in the case of comprising as a label the display body which includes the hidden pattern by the light diffraction structure of this invention. It is sectional drawing which shows the layer structure in the case of comprising as a brittle label the display body which includes the hidden pattern by the light diffraction structure of this invention. It is sectional drawing which shows the layer structure in the case of comprising as a film the display body which includes the hidden pattern by the light diffraction structure of this invention.

Explanation of symbols

S ... reference line X, Y, A, C, A 1, A 2, O, D, A 11, A 22, B 11, B 22, O 1, D 1 ... ( pattern) region P ... pattern P '... Border 1 ... Display body 2 including a hidden pattern ... Partial display surface 3 including a hidden pattern ... Other partial display surfaces 6 ... Stripe pair 6 ₁ ... First straight stripe 6 ₂ ... Second straight stripe 7 ₁ ... First straight line Diffraction grating 7 ₂ ... 2nd linear diffraction grating 8, 8 ₁ , 8 ₂ , 8 ₃ ... Discrimination tool 9 ₁ ... Straight transparent part 9 ₂ ... Straight opaque part 10 ... Printed matter 31 ... Transfer foil 32 ... Label 33 ... Brittle Label 34 ... Film 41 ... Diffraction grating forming layer 42 ... Reflective layer 43 ... Reflective diffraction grating 44 ... Base material 45 ... Release layer 46 ... Heat seal layer 47 ... Adhesive layer 48 ... Separator (release paper)
49 ... Brittle layer

Claims (13)

A display body including an optical diffraction structure, the display surface has different diffraction characteristics, and a plurality of pattern regions having arbitrary outer shapes and inner shapes according to a display pattern are arranged in parallel. The first linear stripes are buried by repetition of a pair of first and second linear stripes that are adjacent to each other and parallel and have different diffraction characteristics, and the first linear stripes are formed by the first linear diffraction grating, and The second straight stripes are respectively constituted by a second linear diffraction grating, and the inclination angle of the first straight stripes and the second straight stripes is inclined with respect to a reference line set with respect to the display surface. When the angle α, the inclination angle of the first linear diffraction grating is the inclination angle β ₁ of the first linear diffraction grating, and the inclination angle of the second linear diffraction grating is the inclination angle β ₂ of the second linear diffraction grating,
The inclination angle α of the stripe pair of the pattern area that constitutes at least one hidden pattern in the plurality of pattern areas is an angle of the stripe pair of the pattern area other than the pattern area that constitutes the hidden pattern adjacent to the pattern area. It is set to be equal to the inclination angle α, and the repetition pitch of the stripe pair is set to be different from each other, and the inclination angle β ₁ and the second inclination angle of the first linear diffraction grating in the pattern area constituting the hidden pattern are set. linear diffraction grating and the tilt angle beta _2, its first inclination angle of the linear diffraction grating pattern region other than the pattern region constituting the hidden pattern adjacent to the pattern region beta ₁ and the inclination angle of the second linear diffraction grating beta ₂ And a display body containing a hidden pattern by a light diffraction structure, characterized in that they are set equal to each other. The pattern area constituting the hidden pattern is composed of one or more isolated pattern areas, and the inclination angle α of the stripe pair of the one or more isolated pattern areas constituting the hidden pattern is the one or more isolated It is set equal to the inclination angle α of the stripe pair in the pattern area adjacent to the pattern area, and the repetition pitch of the stripe pair is set to be different from each other, and the pattern area constituting the hidden pattern the inclination angle beta ₁ of the first linear diffraction grating and the tilt angle beta ₂ of the second linear diffraction grating, the inclination angle beta ₁ of the first linear diffraction grating pattern region adjacent to one or more patterns regions thereof isolated 2. The display body containing a hidden pattern by the light diffraction structure according to claim 1, wherein the display body is set to be equal to the inclination angle β ₂ of the second linear diffraction grating. The pattern area constituting the hidden pattern includes a plurality of adjacent pattern areas, and the inclination angle α and the pitch of the stripe pairs of the plurality of adjacent pattern areas constituting the hidden pattern are mutually different. A first straight line between a plurality of adjacent pattern areas that are set to be equal to the inclination angle α and pitch of the stripe pair of the pattern area adjacent to the plurality of adjacent pattern areas and constitute the hidden pattern. 2. A display body containing a hidden pattern by a light diffraction structure according to claim ₁ , wherein the tilt angle β ₁ of the diffraction grating and the tilt angle β ₂ of the second linear diffraction grating are set to be different from each other. . The first linear diffraction grating and the second linear diffraction grating in each of a plurality of pattern regions arranged in parallel adjacent to each other are set so as to satisfy at least one of different inclination angles and different grating pitches. The display body containing the hidden pattern by the light diffraction structure of any one of Claim 1 to 3 characterized by the above-mentioned. 5. The concealment by the light diffraction structure according to claim 1, wherein a repetition pitch of the pair of stripes in each of a plurality of pattern regions arranged in parallel to each other is set to 1/5 mm or less. A display that contains the pattern. 6. The optical diffraction structure according to claim 1, wherein a difference in the repetition pitch of the stripe pair between pattern regions having different repetition pitches of the stripe pair is set to 1/50 mm or more. A display that contains a hidden pattern. The pattern region constituting the at least one hidden pattern is bordered by a fringe pair having a period shifted by a half period with respect to the period of the fringe pair constituting the pattern area. A display body including a hidden pattern by the light diffraction structure according to claim 1. 8. The display body including a hidden pattern by an optical diffraction structure according to claim 1, wherein the first linear diffraction grating and the second linear diffraction grating are made of a reflection type diffraction grating. . 9. A display body including a hidden pattern by the light diffraction structure according to claim 1, wherein the display body is configured in a transfer foil form. 9. The display body including a hidden pattern by the light diffraction structure according to claim 1, wherein the display body is configured in a label form. 9. A display body including a hidden pattern by the light diffraction structure according to claim 1, wherein the display body is formed in a film form. A discrimination tool for a display body including a hidden pattern by the light diffraction structure according to any one of claims 1 to 11, wherein the discriminator is a repetitive pattern of parallel linear transparent portions and linear opaque portions, Including a hidden pattern by a light diffraction structure, characterized by having a pattern having the same inclination angle and the same repetition pitch as a stripe pair of a pattern area constituting at least one hidden pattern in the plurality of pattern areas of the display body Discriminator for display body to play. 13. The discriminator for a display body containing a hidden pattern by an optical diffraction structure according to claim 12, wherein the width of the linear transparent portion is set smaller than the width of the linear opaque portion.

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