CN2550776Y - Anti-fake mark - Google Patents

Abstract

The utility model relates to an anti-counterfeit label, wherein, an image layer is arranged on a mucilage glue layer, and a plastic base is arranged on the image layer. The utility model is characterized in that the image layer is a chart-changing figure layer with a relief sculpture structure; a metal reflective layer can be arranged between the plastic base and the mucilage glue layer; the chart-changing figure layer with the relief sculpture structure is also arranged on the metal reflective layer. The anti-counterfeit label hiding information is named as ''chart-changing anti-counterfeit label'' by an inventor, and is developed and invented for improving anti-counterfeit performance of the anti-counterfeit label. As the information hidden cannot be judged and identified by people and the detection is operated through machine identification, the utility model has the advantages of increasing difficult in counterfeiting, and enhancing the anti-counterfeit performance of the anti-counterfeit label.

Description

A kind of anti-counterfeiting mark

Technical field

The utility model belongs to the antiforge laser holographic technology, is specifically related to a kind of anti-counterfeiting mark.

Background technology

China has begun the development of laser embossed holography technology from the eighties mid-term (about 1987).Because laser holographic mark can not utilize common photograph and method of printing to duplicate simply; And along with the appearance of embossed holographic technology, make the low-cost hologram of making in enormous quantities be achieved, so laser embossed holography figure is very fast has obtained application aspect anti-tamper security.Optical technology is used for false proof, mainly is basic laws such as the scattering that produces when utilizing light and matter interaction, reflection, transmission, absorption, diffraction, obtains certain special visual effect, for example multilayer optical medium book membrane structure, optical grating construction etc.

At present, are the various types of smooth holographic techniques that utilize multilayered medium membrane structure, the optical grating construction of book film interference effect and utilize the information optics notion in the false proof main means of optical field.On hologram marking, utilize the effort of the optical effect increase anti-counterfeiting power of various technological means, be referred to as DOVDs (Diffraction Optical Variable Devices) in the world, it is optically variable element, wherein relate to many monotechnicss as Kinegram, Multiplane (2D/3D), Object Oriented, DotOriented (Dot-Matrix hologram), Pixel Oriented and micro lens technology etc.The holographic type that is used for actual sign and wrappage abroad has mold pressing in a narrow margin, wide cut mold pressing, stamped metal paper, mold pressing blanching to print, paste certainly photopolymer, photopolymer, wide cut mold pressing composite membrane, mold pressing band and mold pressing line, metallization removal or part metallization removal hyaline membrane/blocking film, (bichromate gelatin), silver halide etc.; The image mode that uses has 2D/3D, dot matrix hologram, 3D, even repeat patterns (wallpaper type), shallow (Shallow) 3D, combination holographic (coordination aniseikania), diffraction grating, white light transmission, white light reflection etc.

During the last ten years, domestic anti-fake holographic technology has also obtained deep development and application.Domestic optical holography is false proof to have adopted various technological means.For example on the embossed holographic carrier, adopt dynamic holographic technology, multichannel technology, 2D/3D technology, dot matrix holographic technique, photochemical embossment technology, micro encryption technology and anti-copy technology etc., use these technology to make various DOVDs products.But all in all, technically keep on improving inadequately, realize that equipment and process research aspect that these technological means adopt also has gap with external.For example, on optical grating construction, adopt Zero-order Grating Microstructure (zeroth order grating microstructure) to make submicron grating abroad; Adopt Multi1ayer Coatings (multicoating) that medium book film with various different refractivities makes but obtainable recognition effect of institute and antifalse effect in research aspect the Optical Thin-Film Security Devices (optics book membrane safety device); Study different processes and make See-Through Hologram (transparent holographic figure); For the diffraction efficiency that improves the paper holography adopts new mask-making technology etc.Owing to the successful Application of antiforge laser holographic technology, become adulterator's No.1 personation target, they do one's utmost to forge anti-fake holographical identification.And, along with popularizing rapidly of moulding holographic technology, the pseudo-technology for making of mould pressing holographic anti-counterfeiting logo is also spread, thereby reduced the anti-counterfeiting performance of embossed holographic sign.The appearance of personation hologram has not only confused the common people, has also confused market, makes rise anti-fake holographic industry soon, also becomes the victim with broad masses.In order to improve the anti-counterfeiting power of antiforge laser holographic technology, must improve constantly the optical characteristics of laser hologram self, improve and realize new manufacture craft.

In order to change the difficult situation that the antiforge laser holographic product faces at present, need in trade management, go into overdrive, set up the access system and the anti-fake product resignation system of anti-fake product manufacturer.Antiforge laser holographic technology itself also needs the research of quickening at the aspects such as machine-readable technology of holographic plate-making, new material (comprising base material) and holographic false proof.For example, adopt computer digit holographic plate-making technology; Exploitation is suitable for the paper base material of the holographic needs of paper; Develop the various macromolecular materials of holographic thermoprinted Technology Need; Research and solve the disposable special material of laser holographic anti counterfeiting label; Or the like.

Summary of the invention

The purpose of this utility model is to provide a kind of novel anti-counterfeiting mark, and this anti-counterfeiting mark is difficult for forging, and its anti-counterfeiting power is greatly improved.

For realizing above-mentioned utility model purpose, a kind of anti-counterfeiting mark is provided with image layer on adhesive-layer, be provided with plastic-substrates on image layer, it is characterized in that: described image layer is the spectral transformation graph layer of embossment structure.

Between above-mentioned plastic-substrates and the adhesive-layer metallic reflector can be set, also be provided with the spectral transformation graph layer of embossment structure on this metallic reflector.

Anti-counterfeiting mark is the artificial a kind of practical technique that increases the anti-counterfeiting power of anti-counterfeiting mark and research and develop of invention, is a kind of anti-counterfeiting mark that hides Info on anti-counterfeiting mark.Because what hide is the information that human eye can't interpretation, therefore needs to adopt machine recognition to detect, this just makes that forging difficulty increases, and anti-counterfeiting power is improved.

Description of drawings

Fig. 1 is the structural representation of reflective anti-counterfeiting mark;

Fig. 2 is the Fourier transform spectrogram;

Fig. 3 is the reproduction synoptic diagram of laser radiation, reflex time information;

The reproduction synoptic diagram of information when Fig. 4 is laser radiation, transparent situation.

Embodiment

As shown in Figure 1, reflective anti-counterfeiting mark can be made up of three layers of different material usually.Ground floor is plastic-substrates 1 (for example PET plastics), and the second layer is metallic reflector 2 (a for example metal aluminum foil), and the 3rd layer is adhesive-layer 3, is generally pressure sensitive adhesive, i.e. non-drying glue layer.Adopt mould pressing process that the spectral transformation figure is stamped in the form of embossment structure and form spectral transformation graph layer 4 on plastic-substrates and the metallic reflector.

The anti-counterfeiting mark of transmission-type is containing metal reflection horizon not then, and the spectral transformation figure is stamped on the plastic-substrates with the form of embossment structure.

Below the spectral transformation figure is introduced.

By the analysis of physical optics to diffractive light field, we know that in the situation of Fraunhofer diffraction (far field construction), diffraction light is by diffraction object 0 (x ₀, y ₀) the light field u that distributes of after image (x, y) can be write as: $u(x,y)=c\&Integral;\&Integral;0(x_0,y_0)\exp [-\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="Y0227837600071.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;}(\mathrm{\&xi;}{x}_0+\mathrm{\&eta;}{y}_0)]d{x}_{0}d{y}_0---\left(1\right)$ Wherein, x ₀, y ₀Be the object space coordinate; X, y are the image space coordinate; C is a complex constant; Integral domain be (∞ ,+∞).

Formula (1) points out that the COMPLEX AMPLITUDE of Fraunhofer diffraction field is the Fourier transform of diffraction object complex amplitude.So, the intensity Φ of diffractional field (x, y) can be write as: Φ (x, y)=| u (x, y) | ²=(1/ λ ²z ₀ ²| 0 (ξ, η) | ²(2) in the formula, $0(\mathrm{\&xi;},\mathrm{\&eta;})=\&Integral;\&Integral;0(x_0,y_0)\exp [-\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="Y0227837600071.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;}(\mathrm{\&xi;}{x}_0+\mathrm{\&eta;}{y}_0)]d{x}_{0}d{y}_0---\left(3\right)$ 0 (ξ η) is 0 (x ₀, y ₀) Fourier transform.Know by inverse transformation $0(x_0,y_0)=\&Integral;\&Integral;0(\mathrm{\&xi;},\mathrm{\&eta;})\exp \left[\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="Y0227837600071.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;}(\mathrm{\&xi;}{x}_0+\mathrm{\&eta;}{y}_0)\right]\mathrm{d\&xi;d\&eta;}---\left(4\right)$ So in the Fraunhofer diffraction field, the relation between the light of diffraction object and diffractive light field distributes just is summed up as a kind of mathematical relation of Fourier transform.Here it is modern age Fourier optics important evidence.

According to above-mentioned principle, earlier certain information (literal or pattern) is carried out Fourier transform, obtain spectrogram shown in Figure 2.Fourier transform spectrogram with Fig. 2 is produced on the aluminized plastic film 7 with the embossment structure form again, as 4 among Fig. 3.When with laser 6 irradiation, through after the reflection of aluminized plastic film 7, on catoptrical light path, put a blank sheet of paper (or other can imaging plane) 5, as shown in Figure 3, just can on this blank sheet of paper, see original information (literal or pattern).Also Fourier transform spectrum Fig. 4 can be produced on the laser holographic mark with the form of embossment structure, just can show original information during laser reconstruction.

If the form of Fourier transform spectrogram with embossment structure is produced on the transparent plastic film 8, the transmitted light during with laser radiation reproduces original information too, as shown in Figure 4.

Owing to hidden the information that human eye can't interpretation in the spectral transformation anti-counterfeiting mark, therefore can adopt machine-readable technology (being machine recognition) to detect.This just provides a kind of method of Information hiding for the machine recognition of anti-counterfeiting mark.

Claims (2)

1. an anti-counterfeiting mark is provided with image layer on adhesive-layer, is provided with plastic-substrates on image layer, it is characterized in that: described image layer is the spectral transformation graph layer of embossment structure.

2. anti-counterfeiting mark according to claim 1 is characterized in that: be provided with metallic reflector between described plastic-substrates and the adhesive-layer, also be provided with the spectral transformation graph layer of embossment structure on this metallic reflector.

Images