JP2011025442A - Pattern forming body - Google Patents

Abstract

An object of the present invention is to visually observe by providing a plurality of predetermined patterns formed with ink containing a material that is hardly permeable to X-rays, and making the hue, brightness, saturation, etc. the same so that they cannot be distinguished by visual observation. Providing a pattern forming body in which the pattern that can be observed is different from the pattern that can be observed with an X-ray inspection device, so that authenticity can be reliably verified.
A pattern formation comprising at least a pattern containing an X-ray hardly permeable material formed on a substrate.
[Selection] Figure 1

Description

  The present invention relates to a pattern forming body in which authenticity can be reliably verified by a pattern formed on a part of a substrate.

  Conventionally, in order to prevent forgery and falsification of image forming bodies such as documents, cash vouchers, cards, etc., it cannot be recognized under irradiation with visible light, but can be recognized by emitting fluorescence in the visible light region only when irradiated with ultraviolet rays. There is a technique in which authenticity can be verified by irradiating ultraviolet rays by providing such a fluorescent latent image. Such a fluorescent latent image is provided by printing in a predetermined pattern on a substrate using ink that emits fluorescence with ultraviolet rays.

In many cases, a fluorescent latent image is provided on a paper base material. However, in recent years, in order to obtain a whiter paper base material, a fluorescent whitening agent is often added to the paper base material itself. This often hindered the verification of the image. Thus, as disclosed in Patent Document 1, there is a proposal to ensure the verification of a fluorescent latent image by patterning a substrate containing a fluorescent agent with an ink containing an ultraviolet absorber.
However, the anti-counterfeit medium with such countermeasures can be used to visually check the latent image by purchasing an inexpensive black light and using it to irradiate the anti-counterfeit medium with ultraviolet rays. Therefore, an unspecified number of people can easily recognize the existence of the forgery prevention technology.

On the other hand, for banknotes that require advanced anti-counterfeiting technology, anti-counterfeiting measures using only the above-mentioned fluorescent light-emitting ink are not effective for anti-counterfeiting. It is desirable to introduce possible anti-counterfeiting technology. For example, development of infrared absorbing ink, infrared light emitting ink, and the like, and various measures for preventing forgery using the ink have been studied.
Infrared absorbing ink and infrared light emitting ink cannot be confirmed visually by irradiating infrared light, but the light emitting effect can be confirmed only by a specific visualization device, and the anti-counterfeiting effect is high. (See Patent Document 2).

JP 11-34564 A Japanese Utility Model Publication 2-87270

However, more than 20 years have passed since the development of anti-counterfeiting technology using infrared rays, and recently, development of an even better anti-counterfeiting technology has been strongly desired.
The present invention has been made under such circumstances, and an object of the present invention is to provide a pattern forming body that can surely verify authenticity.

  In order to solve the above problems, the invention according to claim 1 is a pattern forming body characterized in that at least a pattern containing an X-ray hardly permeable material is formed on a substrate.

  The invention according to claim 2 is characterized in that in the pattern forming body according to claim 1, a visible light shielding and X-ray transmissive reflective layer is further formed so as to cover at least the pattern. To do.

  Furthermore, according to a third aspect of the present invention, in the pattern forming body according to the first aspect, a diffractive structure forming layer is further formed on the visible light shielding and X-ray transmissive reflective layer. It is characterized by that.

  Furthermore, the invention according to claim 4 is the pattern forming body according to any one of claims 1 to 3, wherein a plurality of patterns containing an X-ray hardly permeable material are formed, and each pattern has a different X-ray hardly permeable material. In addition, the X-ray inspection apparatus is capable of discriminating, although the difference cannot be discriminated visually.

  According to the first aspect of the present invention, the presence or absence of a predetermined pattern can be confirmed by an X-ray inspection apparatus that can be operated only by a specific person, and authenticity can be surely verified.

  According to the second aspect of the present invention, the presence of the predetermined pattern is concealed by the reflective layer under visible light irradiation and its presence cannot be confirmed, but its presence can be recognized by observing with an X-ray inspection apparatus. As a result, authenticity verification can be reliably performed.

  According to the third aspect of the present invention, the diffractive structure forming layer is further formed on the visible light shielding and X-ray transmissive reflective layer, so that the security is further improved.

  According to the fourth aspect of the present invention, a plurality of predetermined patterns formed with ink containing an X-ray hardly permeable material are provided, and the hue, brightness, saturation, etc. are the same so that they cannot be distinguished by visual observation. By doing so, the pattern that can be visually observed differs from the pattern that is observed by the X-ray inspection apparatus, and the camouflage effect is enhanced.

It is explanatory drawing which shows the schematic planar state of the pattern formation body of this invention. It is explanatory drawing which shows the schematic planar state of the other pattern formation body of this invention. It is explanatory drawing which shows the structure of the outline of the cross-sectional part in the AB line | wire of the pattern formation body shown in FIG. It is explanatory drawing which shows the general | schematic cross-section structure of the other pattern formation body of this invention. It is explanatory drawing which shows the schematic planar state of the further another pattern formation body of this invention. It is explanatory drawing which shows the structure of the outline of the cross-sectional part in the CD line of the pattern formation body shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, for easy understanding, the lattice spacing of the diffraction grating, the spacing of each layer, and the like are exaggerated as compared with the actual one.

  FIG. 1 shows a planar state of the pattern forming body of the present invention. In this pattern forming body, a “star” -shaped first pattern including an X-ray hardly permeable material is formed on the outermost surface portion, and an “OK” -like second pattern including another X-ray hardly permeable material is formed. Similarly, the hue, lightness, saturation, and the like are formed so that the two cannot be visually distinguished.

  When the portion of the pattern formed in such a state is observed with an X-ray transmission inspection apparatus, an “OK” -like pattern can be recognized in the star-like pattern due to the difference in X-ray transmission of each pattern.

  As shown in FIG. 1, the pattern forming body of the present invention is not only provided with one type of pattern containing an X-ray hardly permeable material, but also forms a plurality of patterns containing an X-ray hardly permeable material, These patterns may include different X-ray hardly permeable materials, and the difference cannot be visually determined, but may be determined by an X-ray inspection apparatus.

  For example, multiple patterns containing X-ray hardly permeable materials on the substrate may use multiple inks with different X-ray transmission densities or multiple inks with different X-ray permeable material component ratios. May be formed. Further, a plurality of patterns may be formed by changing the halftone dot distribution density by changing the X-ray hardly permeable material or changing the pattern film thickness. In this way, patterns having different gradations are observed using the X-ray transmission inspection apparatus, and desired verification can be performed based on the observed patterns.

  In the present invention, the X-ray hardly permeable material is a material that is less permeable to X-rays than paper, plastic film, etc., which can be the base material of the pattern forming body. For example, silver, cadmium, indium, tin, antimony , Tellurium, iodine, cesium, barium, lanthanum, cerium, praseodymium, neodymium, samarium, terbium, hafnium, tantalum, tungsten, rhenium, osmium, iridium, platinum, gold, mercury, thallium, lead, radium, etc. A fine powder of the compound. Among these, barium sulfate is optimal in consideration of the influence on the environment and human body, cost, and the like.

  On the other hand, FIG. 2 shows a planar state of another pattern forming body according to the present invention. The pattern forming body (anti-counterfeit printed matter) 4 is attached with an OVD 5 having a reflective metal film so that the diffraction grating pattern 6 is observed. FIG. 3 shows a cross-sectional configuration along the line AB of such a pattern forming body.

As can be seen from these drawings, the pattern forming body has a diffraction structure forming layer 15 on the protective layer 18, a reflective layer 16 having a visible light shielding property and an X-ray transmission property, and a pattern 17 containing an X-ray hardly transmitting material. And the laminated body (lamination | stacking OVD) in which the contact bonding layer 12 was laminated | stacked one by one has the structure adhere | attached on the base material 13 through the contact bonding layer 12. FIG.
Therefore, the pattern 17 including the X-ray difficulty transmitting property disposed between the reflective layer 16 having a visible light shielding property and an X-ray transmitting property and the base material 13 cannot be visually recognized.

  FIG. 4 shows a schematic cross-sectional configuration of a pattern forming body according to another embodiment of the present invention. This pattern forming body is a laminated body (laminated OVD) in which a diffractive structure forming layer 25, a visible light shielding and X-ray transmitting reflective layer 26, and an adhesive layer 22 are sequentially laminated on a protective layer 28. It has a structure in which it is adhered to a base material 23 on which a pattern 27 containing an X-ray hardly permeable material is formed via an adhesive layer 22.

  Further, FIG. 5 shows an application example of the pattern forming body of the present invention. The illustrated one is a printed matter (gift certificate) on which a forgery prevention measure is taken, and a pattern forming body 32 is inserted into a part of a base material 31 made of paper. FIG. 6 shows a configuration of a cross-sectional portion along line CD of the gift certificate having such a configuration. In the figure, 34 is a base material of a pattern forming body, and 22 is a pattern containing an X-ray hardly permeable material formed thereon.

  Below, the pattern formation body of this invention is demonstrated in detail based on an Example.

[Example 1]
For offset printing using ink containing 40% by weight of barium sulfate powder (Takehara Chemical Industry Co., Ltd .; W-1) and acrylic resin (Toshin Yushi Co., Ltd .; VG-801) as a binder resin. The first pattern was formed on the anti-counterfeit paper. Furthermore, it contains 10% by weight of titanium oxide (manufactured by Sakai Chemical Industry Co., Ltd .; R-45M) and 20% by weight of silica (manufactured by Tosoh Silica Co., Ltd .; SS-50B). A second pattern was further formed on the anti-counterfeit paper by offset printing using an ink using VG-801) as a binder resin to obtain a pattern forming body according to Example 1.

When the obtained pattern formed body was visually observed under a fluorescent lamp, both the first pattern and the second pattern were recognized.
On the other hand, when the pattern forming body was observed with a high-accuracy X-ray transmission inspection apparatus (FLEX-M863 manufactured by Beamsense), only the first pattern, which is a pattern including X-ray difficulty, can be clearly confirmed. It was confirmed that the pattern formation body can be verified.

[Example 2]
On a polyethylene terephthalate (PET) film having a thickness of 16 μm, a release protective layer of acrylic resin (Mitsubishi Rayon Co., Ltd .; BR-87) is provided with a thickness of 1 μm by a gravure coating method, and then urethane An embossed layer of a series resin (manufactured by Sanyo Kasei Sampler Co., Ltd .; IB-582) was provided with a film thickness of 0.5 μm using a gravure coating method. Next, a hologram (diffractive structure) was formed on the embossed layer using an embossing machine having a nickel hologram plate attached thereto, thereby forming a diffractive structure forming layer. And aluminum was vapor-deposited with the thickness of 50 nm by the vacuum evaporation method on the molding surface of the hologram, and the diffraction structure OVD which has a metal reflective layer was obtained. Subsequently, 40% by weight of barium sulfate powder (manufactured by Takehara Chemical Industry Co., Ltd .; W-1) is contained on a metal reflective layer made of an aluminum vapor-deposited thin film having a diffractive structure OVD, and an acrylic resin (Toshin Oil ( Co., Ltd .; VG-801) was used as a binder resin to form a pattern containing an X-ray hardly permeable material by offset printing. Thereafter, a hot melt adhesive (made by Cemedine Co., Ltd .; HM223) mainly composed of ethylene vinyl acetate copolymer resin is formed thereon, and an adhesive layer having a thickness of 5 μm is formed by a roll coater. A diffractive structure transfer foil having a pattern containing the material was obtained.

Subsequently, using the diffractive structure transfer foil having the pattern containing the X-ray hardly permeable material obtained in this manner, the image is transferred onto a paper substrate by a hot stamping machine, and a forgery prevention paper (pattern forming body) is obtained. Obtained.
When the obtained anti-counterfeit paper was visually observed under a fluorescent lamp, the anti-counterfeit pattern containing the X-ray hardly permeable material was unreadable.
On the other hand, when observed with a high-accuracy X-ray transmission inspection apparatus (FLEX-M863 manufactured by Beam Sense Co., Ltd.), a pattern containing an X-ray hardly permeable material could be confirmed in a clear state.

[Example 3]
An anchor layer having a thickness of 1 μm was provided on one surface of a PET film having a thickness of 16 μm by a gravure coating method using a polyester resin (Toyobo Co., Ltd .; Byron SS20). Next, 40% by weight of barium sulfate powder (Takehara Chemical Co., Ltd .; W-1) is contained on the anchor layer, and acrylic resin (Toshin Yushi Co., Ltd .; VG-801) is used as a binder resin. A pattern was formed by offset printing using the main ink. Subsequently, after forming an adhesive layer having a thickness of 3 μm by a gravure coating method using an ethylene vinyl acetate copolymer resin-based hot melt adhesive (Cemedine Co., Ltd .; HM223) on the pattern forming surface of the PET film, A slit (pattern forming body) having a pattern containing an X-ray hardly permeable material was obtained by slitting to a width of 3 mm with a micro slit device.

Subsequently, in the papermaking process, a forgery-preventing paper is obtained by inserting a nozzle into the stock flow in the slice portion of the long paper machine, feeding the thread while flowing water through the nozzle, and making the thread. It was.
When the obtained anti-counterfeit paper was visually observed under a fluorescent lamp, the thread anti-counterfeit pattern was difficult to read due to the scattering effect of the paper.
On the other hand, when observed with a high-accuracy X-ray transmission inspection apparatus (FLEX-M863 manufactured by Beam Sense), a pattern including a thread X-ray hardly permeable material could be confirmed in a clear state.

1, 4... Pattern forming body 2... X-ray transparent “star” -like first pattern 3... OK-like second pattern 5 containing X-ray hardly permeable material .... OVD with metal reflective film
6... Regions 18 and 28 having a diffraction grating pattern, protective layers 15 and 25, diffraction structure forming layers 16 and 26, reflection layer
17 and 27. Patterns 12 and 22 containing X-ray hardly permeable material, 22. Adhesive layer 13, 23. Base material 14, 24. Diffraction grating pattern 31 ... Base material 32 ... Pattern forming body 34 ...・ Base material 35... Pattern including X-ray hardly permeable material

Claims (4)

  A pattern forming body comprising at least a pattern containing an X-ray hardly permeable material formed on a substrate.   The pattern forming body according to claim 1, further comprising a reflective layer having a visible light shielding property and an X-ray transmitting property so as to cover at least the pattern.   2. The pattern forming body according to claim 1, wherein a diffractive structure forming layer is further formed on the visible light shielding and X-ray transmitting reflective layer.   Multiple patterns containing X-ray hardly permeable material are formed, and each pattern contains different X-ray hardly permeable material, and the difference cannot be discerned visually, but can be discriminated by X-ray inspection equipment. The pattern forming body according to any one of claims 1 to 3.

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