JP2005349624A - Image forming body with hologram - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique for preventing a printing forgery of printed matters such as printed matters of valuable papers and stocks and various commercial printed matters, which is capable of suppressing copy reproducibility by an ordinary monochrome or color copying machine, by using an image forming body with a hologram which has functions of preventing the forgery and color photocopying, has high security, excels in decorativeness and facilitates judgment of authenticity even with respect to a reproduced forged matter prepared by copying or scanning by a scanner. <P>SOLUTION: The image forming body with the hologram has a hologram forming layer and a line pattern forming layer having a concealed pattern constituted of lines. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an image forming body with a hologram having a forgery prevention function and a color copy prevention function, and relates to a technique capable of easily authenticating a forgery.

  Conventionally, in order to suppress counterfeit products such as gold vouchers copied with a copying machine, counterfeiting is performed using a copying machine by providing an area composed of halftone dots with a size exceeding the resolving power of the copying machine. A copy check system has been used to identify things. However, due to the technical progress of color copiers, the resolution of color copiers has increased, and it is difficult to sufficiently enhance the copy check effect with a method using a large halftone dot that exceeds the resolution of the copier.

  Therefore, a printed matter with a hidden pattern printed in a line pattern is created, and if the printed matter is a copy, a copy discrimination method that distinguishes the copy by the fact that the hidden pattern does not appear even if it is covered with a transparent discriminator. Proposed. However, since the printed material with a hidden pattern is a relatively simple pattern, in the case of a copy by a copy or scanner, the line pattern can be reproduced by copying, and the same function can be maintained in the copy. Furthermore, since the pattern is simple, those with knowledge can be manufactured relatively easily, and the effect as an anti-counterfeiting measure is low. Although it is not known that a hidden pattern is included, if it is known that a counterfeiter having a normal printing technique can counterfeit it relatively easily. In addition, it is difficult to increase the resolution of printed matter in terms of ensuring stable productivity.

  In recent years, holograms that are excellent in design properties, difficult to duplicate the main body, and have high security have been used as anti-counterfeiting and color copy countermeasures. Furthermore, with respect to holograms, the design of the hologram itself is required only for confirmation of the design, thereby increasing security, improving functionality, and adding value. However, at first glance, many counterfeited holograms have been used that make full use of sophisticated hologram fabrication techniques until they cannot be distinguished from the real ones. Hologram authenticity can be easily judged by comparing and observing a counterfeit product and the real product, but it is not easy to identify “fake” by looking only at the counterfeit product. Comes out. Techniques such as the fact that a hologram emits fluorescence or an image is raised by a polarizing film can be used. However, the production of a hologram plate requires enormous costs and is restricted by the design itself. In addition, there is a problem in terms of cost that the burden on the verification tool increases.

  The present invention has been made in view of such problems, and is a copy forgery manufactured by scanning with a copy or a scanner having a high security and a high decorativeness, which has a forgery prevention function and a color copy prevention function. An object of the present invention is to provide a hologram-formed image forming body that can easily authenticate authenticity.

To achieve the above objectives, ie
The invention according to claim 1
An image forming body with a hologram, comprising: a hologram forming layer; and a line pattern forming layer in which a hidden pattern is formed of lines.

The invention according to claim 2
In the line pattern forming layer, 2 to several types of line patterns are formed in which lines with the same line pitch with 1: 1 line ratio between the line part and the non-line part are arranged at different line angle. The line pattern includes a latent image line pattern formed by shifting the line phase by a half pitch with respect to the line pattern within one or several types of line pattern areas. An image forming body with a hologram according to claim 1.

The invention according to claim 3
Visualization line sheets each having a line pattern for visualization having the same line ratio and the same line pitch as the line pattern formed on a transparent film on the two or several types of line patterns are mutually connected. 3. The latent image line pattern formed in each line pattern region corresponding to each line angle is visualized when superposed so that the angles match each other. It is an image forming body with a hologram.

The invention according to claim 4
The hologram-formed image forming body according to claim 1, wherein the hologram forming layer is a relief hologram, a volume hologram, or a diffraction grating.

  According to the present invention, a forgery prevention and color copy countermeasures can be taken, with a high security, excellent decorativeness, and with a hologram that makes it easy to authenticate a copy counterfeit made by scanning with a copy or a scanner. An image forming body can be provided. In the image forming body with hologram of the present invention, the line pattern is extremely complicated including the latent image line pattern, so that the reproduction reproducibility by a normal monochrome copying machine or a color copying machine can be suppressed. This has the effect of improving the effect of preventing printing forgery of printed materials such as various commercial printed materials.

  Hereinafter, the best embodiment of the present invention will be described. 1 and 2 are explanatory views showing the concept of a method of recognizing a latent image line pattern by superimposing a visualized line sheet on the hologram-formed image forming body of the present invention. As shown in FIG. 1, a visualized line sheet 1 is used as a confirmation tool. The image forming body 2 includes a hologram forming layer 3 and a line pattern forming layer 4. As shown in FIG. 2, the image forming body 2 of the present invention has a hologram forming layer 3 and a line pattern forming layer 4 on a base material 5 made of paper, plastic film or the like [FIG. 2 (a). Reference] When the image forming body 2 is viewed from the front, the hologram image 3a is displayed, and it is not known that there is a line pattern 4a [see FIG. 2 (b)]. Those copied by color copying or the like capture the hologram image 3a, but the underlying line pattern 4a is hidden and cannot be copied. On the other hand, when the original image forming body 2 is viewed from an oblique direction at a different angle, the hologram image 3a disappears and the line pattern 4a can be seen [see FIG. 2 (c)]. In this state, the visualized line sheet When 1 is overlapped and viewed, the latent image line pattern 4b of the line pattern 4a is visualized and a visible image can be confirmed [see FIG. 2 (d)].

  FIG. 3 is a diagram showing an example of the configuration of the visualized line sheet 1 and the image forming body 2. The image forming body 2 is formed by forming a line pattern forming layer 4 on a base material layer 5 made of paper, plastic film or the like, and laminating a hologram forming layer 3 on the line pattern forming layer 4 via an adhesive layer 7. Further, an example in which the hologram forming layer 3 is covered with the protective layer 6 is shown.

In the image forming body 2 of the present invention, since the line pattern is extremely complicated including the latent image line pattern, copy reproducibility by a normal monochrome copying machine or a color copying machine can be suppressed, and an ID card, a credit card, etc. Used for printed matter such as cards, certificates, commuter passes, gift certificates, valuable printed matter such as ID certificates, and various commercial printed matter such as securities printed matter.

  Hereinafter, for the line pattern forming layer 4 in the present invention, as an example, the visualized line sheet is superimposed on the line pattern on which the latent image line pattern is formed, and the surface is rotated on the overlapping surface, Since it has a multi-order change function that visualizes different images according to the latent image pattern one after another, an example that can easily determine the authenticity of a printed matter will be described in detail. As shown in FIG. 4 (a), the line pattern forming layer 4 according to the present invention has a line ratio of 1: 1 between the line part and the non-line part on the substrate 5, and the line with the same line pitch. A pattern 4a is formed, and the line pattern 4a is composed of two to several types of line pattern areas formed at different line angles.

  Each pattern area formed at different line angles of the line pattern 4a includes a latent image pattern 4b formed by a latent image line pattern formed by shifting the line phase by a half pitch.

  On the line pattern 4a of the line pattern forming layer 4 in the present invention, as shown in FIG. 4 (b), the same line ratio as the line pattern 4a (the line ratio between the line part and the non-line part is the same). 1: 1) A line sheet 8 on which a line pattern 9 having the same line pitch as that of 1: 1) is formed on a transparent substrate 10 is superposed with its line direction aligned.

  4 (c) to 4 (e) show that the line sheet 8 is superposed on the line pattern 4a of the line pattern forming layer 4 and each line is formed on the one to several types of latent image line patterns. When superimposed at an angle that matches (becomes parallel to) the angle, the latent image pattern 4b by the latent image line pattern corresponding to the angle is visualized.

  In FIG. 4C, the visualized line sheet 8 is overlaid on the line pattern 4a, and the line of the line pattern 9 is set in the horizontal direction (angle 0 °), for example, with the letter “T”. By superimposing the latent image line pattern in alignment with the horizontal line direction (angle 0 °), the letter 4b (c) “T” is visualized through the visualized line sheet 8. To do.

  In FIG. 4D, the visualized line sheet 8 is overlaid on the line pattern 4a, and the line of the line pattern 9 is inclined in the direction of 45 °, for example, the latent character “P”. By superimposing and aligning with the direction of the line inclined at 45 ° of the image line pattern, the letter 4b (d) “P” is visualized through the visualized line sheet 8.

  Further, in FIG. 4E, the visualized line sheet 8 is superimposed on the line pattern 4a, and the line of the line pattern 9 is made vertical (90 °), for example, with the letter “O”. By superimposing in alignment with the direction of the vertical line (90 °) of the latent image line pattern, the character 4b (e) “O” is visualized through the visualized line sheet 8. .

  As an example of the line pattern 4 a formed on the line pattern forming layer 4, the line pattern layer 4 is formed on the substrate 5. In this line pattern 4a, three types of line having different line angles are arranged in each area of the 10,000th line pattern area, the 20,000th line pattern area, and the 30,000th line pattern area of the line. The first, second and third line pattern areas are defined as one unit line pattern area, and a plurality of units are repeatedly arranged. The latent image line pattern constituting the latent image pattern 4b is formed in the formation area of the 30,000 line pattern 4a. Japanese Patent Laid-Open No. 2001-213042 discloses the structure of the line pattern in detail, and a line pattern composed of these line pattern structures can be applied.

  FIG. 5 shows a visualized line sheet 8 having a line pattern for visualizing the latent image line pattern 4b superimposed on the line pattern 4a of the line pattern forming layer 4 of the present invention. It is. As shown in the figure, the visualized line sheet 8 is formed by forming a line pattern 9 on a transparent base material 10 such as a transparent plastic film or glass plate, and each line 11 constituting the line pattern 9 is shown in FIG. Is the width ratio of the line part 11a (black line part, colored part, opaque part, visible light non-transparent part) and non-line part 11b (transparent part, visible light transmissive part), so-called line ratio, It is set to approximately 1: 1, and is arranged in parallel at the same line pitch E (width E1 of the line part 11a, width E2 of the non-line part 11b). The line pitch E and the line pitch D of the line pattern 4a of the line pattern forming layer 4 are set to have a relationship of E = D.

  The line pattern forming layer 4 in the present invention has the same line ratio as that of the line pattern 4a on the line pattern 4a as described above having lines of different line angles in two to several types of line pattern regions. The image forming line sheet 8 in which the image forming line pattern 9 having the same line pitch is formed on the transparent film 10 is superposed so that the line angle is aligned (parallel).

  As a result, latent image line patterns (for example, latent image patterns of T, O, and P characters) formed in each line pattern region corresponding to each line angle are respectively visualized line sheet 8. By adjusting the angle, the image is visualized as a visualized image (for example, letters T, O, and P). For example, the line of the line pattern 4a of the line pattern forming layer 4 that does not overlap the line of the line pattern 9 of the visualized line sheet 8 is the line pattern 4a in the latent image line pattern region. Is a line through each transparent line (opaque line; black line; line part) of the line pattern 9 through the transparent part (transparent line; non-line part). The latent image line pattern 44b is visualized and observed as a positive image.

  On the other hand, for example, the line of the line pattern 4a of the line pattern forming layer 4 that does not overlap the line of the line pattern 9 of the visualized line sheet 8 is a line outside the latent image line pattern area. If it is a single line constituting the pattern 4a, the single line passes through each transparent line (opaque line; black line; line part) of the line pattern 8 through the transparent part (transparent line; non-line part). The latent image line pattern is visualized and visually observed as a negative image.

  In the line pattern forming layer 4 in the present invention, the line pattern area may be formed over substantially the entire area on the sheet, or may be formed divided into one or several places. .

  In the line pattern forming layer 4 according to the present invention, the one or several kinds of latent image line patterns 4a are formed at the same place in the line pattern 4a constituted by the two or several kinds of line pattern areas. They may be formed at different locations.

  In addition, as a method of dividing the formation area of the line pattern 4a of the line pattern formation layer 4 of the present invention, that is, the area where the latent image emerges as a visible image, into the line pattern area, In addition, various design shapes such as a dot shape and a lattice shape are possible. Also, in the case of halftone dots and lattices, the same result as in the case of filaments can be obtained by dividing (for example, equally dividing) with a constant area.

The line pitch D of the line of the line pattern 4a of the line pattern forming layer 4 and the line of the line pattern 8 of the visualized line sheet 8 is 20 to 2000 μm, preferably 20 to 1000 μm. It is preferable to set to any one of the ranges, and when the line pitch D is less than 20 μm, the line widths D1 and D2 of the line part and the non-line part ½ of the pitch D are respectively 10
Since the line width of the latent image line pattern 4b is too fine because the line width is extremely thin less than μm, even if the visualized line sheet 8 is superposed and observed, the reproducibility is poor and the visualization becomes weak. .

  On the other hand, when the pitch D of each line of the line pattern 4a of the line pattern forming layer 4 and the line of the line pattern 8 of the visualized line sheet 8 is greater than 2000 μm, the line portion and the non-line portion Since the line widths of the line portions are extremely thicker than 1000 μm respectively, the design of the latent image line pattern 4b is also rough, and the image is viewed when the visualized line sheet 8 is superimposed and visualized. Therefore, the visual recognition may be impossible, and the latent image pattern 4b can be discriminated without interposing the visualized line sheet 8, or it is easily reproduced and reproduced by a color copier or the like. There is a case.

  Accordingly, the line width (1/2) D of each line portion (and non-line portion) of each of the lines is either in the range of 10 to 1000 μm, preferably in the range of 10 to 500 μm. It is desirable to set.

  In the line pattern forming layer according to the present invention, the line pitch 4 of the line pattern 4 and the line 11 of the latent image pattern and the line 11 of the line sheet for visualization 8 are within the range of 20 to 1000 μm. By setting the line width (1/2) of the line part 9a (and the non-line part 9b) of the line 11 within a range of 10 to 500 μm, A line pattern forming layer with a good latent image pattern that reveals a clear visualized image is obtained, and this line pattern forming layer is visualized on a reproduced copy reproduced using a color copier. When the line sheet 8 was superposed and aligned, a clear visible image could not be displayed, and the anti-copying and anti-counterfeiting effects could be confirmed.

Further, the line portions of the line pattern 4a of the line pattern forming layer 4 and the line of the line pattern 8 of the visualized line sheet 8 (each line part, all lines of the latent image). The color tone and the number of colors (monochrome, multicolor) applied to the line portion of the pattern or the line portion other than the latent image line pattern are not particularly limited. However, since the single color has poor visual reproducibility of the line, the PCS value (Point Contrast
(Signal value; relative reflectance; value indicating contrast) is desirably 0.5 or more (A filter). Printing can be reproduced by offset printing, gravure printing, or DDPC. PCS value = (line non-line part reflectance−line line line reflectivity) / line non-line part reflectivity Further, the line pattern 4a on the substrate 5 of the line pattern forming layer in the present invention. In the formation area or the latent image line pattern formation area, a normal print image and color may be formed as a base image and a base color by a completely independent design. However, in consideration of the reproducibility and visualization of the latent image pattern by the latent image line pattern, it is preferable to avoid the color approximate to the color tone adopted for the latent image pattern because it may cause camouflage. In addition, a normal print image or coloring by a completely independent design or the like may be formed in an area other than the line pattern formation area on the substrate 5.

  The line pattern forming layer 4 in the present invention rotates the visualized line sheet 8 on the line pattern 4a to sequentially reproduce and visualize latent image characters of one to several types of latent image line patterns. Therefore, different line angles are attached to each line in two or several types of line pattern areas. In this case, if the line angles that can be visually recognized are approximated, the functionality of each other becomes an obstacle. In order to emphasize the functionality of becoming visible or rotated, it is desirable to equally divide the viewing angle by 180 °, but this is not the case in the present invention.

The setting of the line angle of each line 11 of the line pattern 4a of the line pattern forming layer 4 is not particularly limited, but the characters “T”, “O”, “P” at the line angle. Are formed as a latent image line pattern, for example, an angle inclined 5 ° to the left as a line angle expressing the character “T”, and a line angle 60 ° to the left as a line angle expressing the character “O”. You may set to the angle which inclines 120 degree | times to the right as an angle which inclines, and the line angle which represents character "P".

  FIG. 6 is a diagram showing an example in which the image forming body 2 of the present invention is provided on the ID card 12. The ID card 12 is provided with an image forming body 2, a face photograph 13, and the like. When the ID card 12 is viewed with the naked eye in this state, the hologram image of the image forming body 2 can be confirmed.

  FIG. 7 is a diagram in which the visualized line sheet 1 is placed on the ID card 12 of FIG. 6. The ID card 12 in which the hologram image of the image forming body 2 can be confirmed in FIG. 6 and the hidden pattern character TP can be confirmed in the state of FIG. 7 is proved to be the original ID card 12. However, even if the hologram image can be confirmed in FIG. 6, if there is an ID card 12 in which the hidden pattern character TP cannot be confirmed in the state of FIG.

  In this way, by using the visualized wire sheet 1 as a confirmation tool, it is possible to check the original hologram and an object created by copying the picture by a simple method.

  As the hologram forming layer 3, a relief hologram or a volume phase hologram in which interference fringes are recorded in the thickness direction of the film is used. Moreover, not only the hologram image | photographed with the laser beam but the diffraction grating by electron beam drawing etc. may be sufficient.

  When a volume phase hologram is used as the hologram, it is desirable to limit the direction of the diffracted light of the hologram to a certain range because the hidden pattern is easily visible if the range in which the hologram image can be viewed is limited to a certain direction. Further, in order to make the hidden pattern easy to see when the hidden pattern is displayed, it is desirable that the hologram forming layer 3 has high transparency.

  As described above, the image forming body of the present invention has high decorativeness, and the line pattern is extremely complicated including the latent image line pattern. Therefore, it is possible to suppress copying reproducibility by a normal monochrome copying machine or a color copying machine. In addition, it has the effect of improving the effect of preventing printing counterfeiting of printed materials such as valuable printed materials and securities printed materials. The image-formed body with hologram of the present invention can be used for toys, novelties, premiums, packaging materials, books and the like.

It is a conceptual diagram which shows the method of superimposing the visualized line sheet on the image forming body with a hologram of this invention, and recognizing it by visualizing a latent image line pattern. It is explanatory drawing which shows the method of superimposing the visualized line sheet on the image forming body with a hologram of this invention, and recognizing it by visualizing a latent image line pattern. It is sectional drawing which shows an example of a structure of the imaged line sheet of this invention, and an image forming body with a hologram. (A) is a top view of the line pattern formation layer of the image forming body with a hologram of the present invention. (B) is a top view of the visualized line sheet for superimposing on the line pattern formation layer and visualizing. (C)-(e) is a top view of the several visualized image visualized by superimposing the visualized line sheet on the line pattern formation layer. It is an enlarged plan view of the visualized line sheet in the present invention. It is a top view which shows the example which provided the image forming body of this invention in the IC card. FIG. 6 is an explanatory diagram for visualizing a hidden pattern by placing a visualized line sheet on the image forming body of FIG. 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 8 ... Visualization line sheet 2 ... Image forming body 3 ... Hologram formation layer 4 ... Line pattern formation layer 4a, 9 ... Line pattern 4b ... Latent image Line pattern 5 ... Base material 6 ... Protective layer 7 ... Adhesive layer 11a ... Line part 12b ... Non-line part 10 ... Transparent film 11 ... Line 12 ... IC card 13 ... face photo E ... line pitch E1 ... line width E2 ... non-line width

Claims (4)

  An image forming body with a hologram, comprising: a hologram forming layer; and a line pattern forming layer in which a hidden pattern is formed by lines.   In the line pattern forming layer, 2 to several types of line patterns are formed in which lines with the same line pitch with 1: 1 line ratio between the line part and the non-line part are arranged at different line angle. The line pattern includes a latent image line pattern formed by shifting the line phase by a half pitch with respect to the line pattern within one or several types of line pattern areas. The image-formed body with a hologram according to claim 1.   Visualization line sheets each having a line pattern for visualization having the same line ratio and the same line pitch as the line pattern formed on a transparent film on the two or several types of line patterns are mutually connected. 3. The latent image line pattern formed in each line pattern region corresponding to each line angle is visualized when superposed so that the angles match each other. Image forming body with hologram.   The hologram-formed image forming body according to any one of claims 1 to 3, wherein the hologram forming layer is a relief hologram, a volume hologram, or a diffraction grating.

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