JP2013242453A - Uneven structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an uneven structure excellent in designability, forgery prevention property and reliability in security.SOLUTION: An uneven structure includes basic scattering structures 21 and 22 generating diffraction light by being irradiated with light having a predetermined wavelength to display specific information. The basic scattering structures 21 and 22 include a first basic scattering structure 21 corresponding to a portion where the brightness of an original image 1 is 0, and a second basic scattering structure 22 corresponding to a portion where the brightness of the original image 1 is 100, respectively. The uneven structure includes a first scattering degree portion 3a constituted by an aggregation of the first basic scattering structure 21, a second scattering degree portion 3b constituted by an aggregation of the second basic scattering structure 22, and a third scattering degree portion 3b constituted by an aggregation in which the first basic scattering structure 21 and the second basic scattering structure 21 are alternately arranged. The uneven structure constitutes an original image 1 by setting angles of the basic scattering structures 21 and 22 according to the brightness of the original image 1.

Description

  The present invention relates to a concavo-convex structure that prevents forgery of an article by being attached or transferred to the article or the like.

  Conventionally, various anti-counterfeiting measures have been taken for goods that require anti-counterfeiting as well as authentication such as cards such as cash cards, credit cards, check cards, cash vouchers, identification cards, important documents, etc. ing. For example, an anti-counterfeit medium in which a display using a diffraction grating is used to confirm the authenticity of an article and a diffraction grating display and a scattering structure are configured on the same screen is disclosed (Patent Document 1). .

  In addition, a structure is disclosed in which phase information of a Fourier-transformed original image is multi-valued and recorded as a depth so that information that cannot be viewed is reproduced by irradiating laser light (Patent Document 2).

JP 2007-219551 A Japanese Patent Laid-Open No. 2004-212927

  However, since the anti-counterfeit medium disclosed in Patent Document 1 uses the whiteness of the scattering structure to form a symbol, whether or not the symbol is simply white is the point of authenticity determination. Therefore, if it is possible to create a scattering structure that looks the same as it looks, the medium may be forged.

  The present invention provides a concavo-convex structure that is excellent in design, has high anti-counterfeiting properties, and is highly reliable in terms of security.

  The concavo-convex structure of the present invention that achieves the above object has a basic scattering structure in which diffracted light is generated by irradiating light of a predetermined wavelength and displays specific information. A first basic scattering structure corresponding to a first luminance portion and a second basic scattering structure corresponding to a second luminance portion of the original image, and the first basic scattering structure is composed of a set of the first basic scattering structures. A first scattering degree part, a second scattering degree part constituted by a set of the second basic scattering structures, and a set obtained by alternately arranging the first basic scattering structures and the second basic scattering structures. And a third scattering degree unit, wherein the original image is configured by setting angles of the first basic scattering structure and the second basic scattering structure corresponding to the luminance of the original image. .

  The second basic scattering structure is a structure obtained by rotating the first basic scattering structure by 90 °.

  Further, the basic scattering structure is characterized in that data corresponding to the specific information is Fourier-transformed, the phase information is multivalued and recorded as a depth.

  According to the present invention, it is possible to provide a concavo-convex structure having excellent design, high anti-counterfeiting properties, and high reliability in terms of security.

It is a figure which shows the original image of 1st Embodiment. It is a figure which shows the hidden image of 1st Embodiment. It is a figure which shows the basic scattering structure data of the hidden image of 1st Embodiment. It is a figure which shows the state which rotated 90 degree | times the basic scattering structure data of the hidden image of 1st Embodiment. It is a figure which shows the uneven structure body which recorded the basic scattering structure data of the hidden image in the image data of the original image of 1st Embodiment. It is the figure which expanded the part of A of FIG. It is the figure which expanded the part of B of FIG. It is a figure which shows the state which rotated the uneven structure 3 of 1st Embodiment 90 degrees. It is a figure which shows the state which irradiated the laser beam from the light source to the uneven structure body of 1st Embodiment. It is a figure which shows the hidden image of 2nd Embodiment. It is a figure which shows the state which irradiated the laser beam from the light source L to the part of the 2nd basic scattering structure 22 of the uneven structure 3 of 2nd Embodiment. It is a figure which shows the state which irradiated the laser beam from the light source L so that the part of the 1st basic scattering structure 21 and the 2nd basic scattering structure 22 part of the uneven structure 3 of 2nd Embodiment might be straddled.

  Hereinafter, an uneven structure according to the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram illustrating an original image 1 according to the first embodiment.

  The original image 1 of the present embodiment is a pattern created as electronic information on a computer. The image data of the original image 1 is monochrome image data, and the color image is converted to monochrome by converting it into a gray scale. Originally, in the case of a monochrome image, the image data of the monochrome original image 1 is used as it is.

  In the present embodiment, as shown in FIG. 1, the original image 1 includes a first luminance unit 1a having a luminance of 100 as a first luminance, a second luminance unit 1b having a luminance of 0 as a second luminance, The third luminance portion 1c having a luminance of 50 as a luminance of 3 is shown in three gradations.

  FIG. 2 is a diagram illustrating a hidden image 2 according to the first embodiment.

  The hidden image 2 is information that is embedded in the original image 1 shown in FIG. 1 so as not to impair the characteristics of the original image 1 and is different from the visible original image 1. The hidden image 2 is preferably an image, a figure, a character, or the like that can be confirmed only under predetermined observation conditions.

  FIG. 3 is a diagram illustrating the first basic scattering structure 21 of the hidden image 2 according to the first embodiment. FIG. 4 is a diagram illustrating the second basic scattering structure 22 obtained by rotating the basic scattering structure data of the hidden image of the first embodiment by 90 °.

  The first basic scattering structure 21 of the first embodiment is obtained by Fourier-transforming the hidden image 2 and binarizing the phase information and recording it as a depth. The phase information after Fourier transform is not limited to binarization, but may be multi-valued and recorded as depth. The first basic scattering structure 21 is configured such that a set of diffracted light has specific information when irradiated with laser light. When the first basic scattering structure 21 of the present embodiment is irradiated with laser light, the characters “OK” shown in FIG. 2 can be observed.

  At first glance, the first basic scattering structure 21 appears to be a simple white pattern. However, when irradiated with laser light, a set of diffracted light can be observed, so that it is possible to make a true / false determination.

  The second basic scattering structure 22 has the same basic structure as the first basic scattering structure 21, but has a structure obtained by rotating the first basic scattering structure by 90 °.

  At first glance, the second basic scattering structure 22 appears to be a simple black pattern, but when irradiated with laser light, a set of diffracted light can be observed, and therefore it is possible to make a true / false determination.

  Next, the concavo-convex structure will be described.

  FIG. 5 is a diagram illustrating the concavo-convex structure 3 formed by recording the basic scattering structure 21 of the image 2 while hiding the original image 1 of the first embodiment. FIG. 6 is an enlarged view of a portion A in FIG. Further, FIG. 7 is an enlarged view of a portion B in FIG. FIG. 7 is a diagram illustrating a state in which the concavo-convex structure 3 of the first embodiment is rotated by 90 °.

  The uneven structure 3 shown in FIG. 5 has the first basic scattering structure 21 and the second basic scattering structure 22 shown in FIGS. 3 and 4 arranged in accordance with the luminance of the original image 1 shown in FIG. This is a design. Therefore, the concavo-convex structure 3 can represent the original image 1.

  The concavo-convex structure 3 according to the present embodiment includes a first scattering degree part 3a, a second scattering degree part 3b, and a third scattering degree part 3c. The first scattering degree unit 3a is used for the first luminance unit 1a having the luminance of the original image shown in FIG. The second scattering degree unit 3b is used for the second luminance unit 1b in which the luminance of the original image shown in FIG. The third scattering degree unit 3c is used in the third luminance unit 1c having the luminance of the original image shown in FIG.

  For example, as shown in FIG. 6, the portion A in FIG. 5 corresponds to the first scattering degree unit 3 a and the second scattering degree unit 3 b. The first scattering degree unit 3 a is configured by a set of first basic scattering structures 21, and the second scattering level unit 3 b is configured by a set of second basic scattering structures 22.

  Moreover, as shown in FIG. 7, the part B of FIG. 5 corresponds to the first scattering degree part 3a and the third scattering degree part 3c. And the 3rd scattering degree part 3c is comprised from the set which arranged the 1st basic scattering structure 21 and the 2nd basic scattering structure 22 alternately.

  Such a concavo-convex structure 3 is created using a conventionally used technique such as EB drawing. At this time, the white portion or black portion of the pattern is formed so as to correspond to the concave portion or the convex portion.

  When the concavo-convex structure 3 having such a configuration is rotated by 90 °, black and white of the design appear to be reversed as shown in FIG. Note that the color of the third scattering degree unit 3c corresponding to the third luminance unit 1c having the luminance of the original image shown in FIG.

  FIG. 9 is a diagram illustrating a state in which the concavo-convex structure 3 according to the first embodiment is irradiated with laser light from the light source L.

  Usually, when the concavo-convex structure 3 is observed, the observer can observe the original image 1 shown in FIG. Further, when the concavo-convex structure 3 is rotated by 90 °, it is possible to observe the original image 1 in which black and white are reversed as shown in FIG. At this time, the third luminance unit 1c having a luminance of 50 can be observed without change before and after the rotation. In a normal state, the hidden image cannot be observed.

  As shown in FIG. 9, when the concavo-convex structure 3 is irradiated with laser light from the light source L, a hidden image can be observed by a set of diffracted light. In the case of the present embodiment, it is possible to observe the character “OK” as a hidden image, and it is possible to determine whether it is true or false.

  FIG. 10 is a diagram illustrating a second hidden image 2 ′ according to the second embodiment.

  In the second embodiment, unlike the first basic scattering structure 21, the second basic scattering structure 22 is irradiated with laser light. As shown in FIG. 10, the first hidden image 2 “ As a structure capable of observing the second hidden image 2 ′ “NG” different from “OK”, the structure is rotated 90 ° with respect to the first basic scattering structure 21.

  When the concavo-convex structure 3 having such a configuration is rotated by 90 °, the black and white of the design appear to be reversed as shown in FIG. 8 as in the first embodiment. At this time, the third luminance unit 1c having a luminance of 50 can be observed without change before and after the rotation.

  FIG. 11 is a diagram illustrating a state in which laser light is irradiated from the light source L onto the second basic scattering structure 22 of the concavo-convex structure 3 of the second embodiment. FIG. 12 is a diagram showing a state in which laser light is irradiated from the light source L so as to straddle the first basic scattering structure 21 and the second basic scattering structure 22 of the concavo-convex structure 3 of the second embodiment. is there.

  Normally, when the concavo-convex structure 3 is observed, the observer can observe the monochrome original image 1 shown in FIG. 1 or the monochrome original image 1 in which black and white are reversed. In a normal state, the hidden image cannot be observed.

  As shown in FIG. 11, when the concavo-convex structure 3 is irradiated with laser light from the light source L, it is possible to observe a hidden image by a set of diffracted light. In the case of the present embodiment, the laser beam irradiated to the first basic scattering structure 21 is observed so that the letters “OK” as the first hidden image 2 are raised as shown in FIG. It is possible to determine true / false. With the laser light applied to the second basic scattering structure 22, as shown in FIG. 11, it can be observed that the letters “NG” as the second hidden image 2 ′ are raised, Can be determined.

  In addition, as shown in FIG. 12, in the laser light irradiated so as to straddle the first basic scattering structure 21 and the second basic scattering structure 22, “OK” as the first hidden image 2 and Two characters “NG” as the second hidden image 2 ′ can be observed as being raised, and it is possible to determine whether it is true or false.

  Next, the usage method of the uneven structure 3 of this embodiment is demonstrated.

  Usually, as the concavo-convex structure 3 used by adhering to a printed matter or the like, a diffraction grating having a reflection type by providing a metal reflection film on the relief surface or plane of the concavo-convex relief structure by vapor deposition or the like is used. Other than that, a diffraction grating that forms an amplitude type diffraction grating whose amplitude changes periodically or a phase type diffraction grating whose refractive index changes periodically forms a reflective type by providing a metal reflective film on the back surface. A grating or a volume type diffraction grating in which a diffraction grating is constituted by interference fringes in a volume type photosensitive material may be used.

  Of course, it is possible to use a transmission type instead of a reflection type, and the diffraction grating may be a transmission type diffraction grating.

  The concavo-convex structure 3 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).

  A layer structure and a manufacturing process thereof are described in Patent Document 2 in the case where the concavo-convex structure 3 including the hidden image 2 by the light diffraction structure of the present embodiment is configured in each form of transfer foil, label, brittle label, and film. It is the same as that described in the above.

  As described above, the concavo-convex structure 3 of the present embodiment includes the basic scattering structures 21 and 22 that generate diffracted light and display specific information when irradiated with light of a predetermined wavelength. Includes a first basic scattering structure 21 corresponding to a first luminance portion of the original image 1 and a second basic scattering structure 22 corresponding to a second luminance portion of the original image 1. The first scattering unit 3a composed of a set of basic scattering structures 21, the second scattering unit 3b composed of a set of second basic scattering structures 22, the first basic scattering structure 21 and the second basic scattering structure And a third scattering degree unit 3c composed of a set of 22 arranged alternately, and the angles of the first basic scattering structure 21 and the second basic scattering structure 22 are set corresponding to the luminance of the original image 1 Since the original image 1 is constructed, it has excellent design, high anti-counterfeiting properties, Tea manner also is intended reliable.

  Further, since the second basic scattering structure 22 is a structure obtained by rotating the first basic scattering structure 21 by 90 °, it is possible to change the observation image with a simple structure.

  In addition, since the basic scattering structures 21 and 22 perform Fourier transform on data corresponding to specific information and multi-value the phase information and record it as a depth, the basic scattering structures 21 and 22 can be easily manufactured in a short time.

  As described above, the concavo-convex structure has been described based on some examples, but the present invention is not limited to these examples, and various modifications are possible.

DESCRIPTION OF SYMBOLS 1 ... Original image 2 ... Hidden image 21 ... Basic scattering structure 22 ... Basic scattering structure 3 ... Uneven structure

Claims (3)

It has a basic scattering structure that generates diffracted light by displaying light of a predetermined wavelength and displays specific information,
The basic scattering structure has a first basic scattering structure corresponding to a first luminance portion of the original image and a second basic scattering structure corresponding to a second luminance portion of the original image;
A first scattering degree part composed of a set of the first basic scattering structure;
A second scattering degree part composed of a set of the second basic scattering structures;
A third scattering degree part composed of a set in which the first basic scattering structure and the second basic scattering structure are alternately arranged;
With
An uneven structure, wherein the original image is configured by setting angles of the first basic scattering structure and the second basic scattering structure corresponding to the luminance of the original image. The concavo-convex structure according to claim 1, wherein the second basic scattering structure is a structure obtained by rotating the first basic scattering structure by 90 °. The concavo-convex structure according to claim 1, wherein the basic scattering structure performs Fourier transform on data corresponding to the specific information, multi-values the phase information, and records it as a depth. .

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