CN101359171A - Genuine-fake identification method for laser holographic plate-making - Google Patents
Genuine-fake identification method for laser holographic plate-making Download PDFInfo
- Publication number
- CN101359171A CN101359171A CNA2007100151603A CN200710015160A CN101359171A CN 101359171 A CN101359171 A CN 101359171A CN A2007100151603 A CNA2007100151603 A CN A2007100151603A CN 200710015160 A CN200710015160 A CN 200710015160A CN 101359171 A CN101359171 A CN 101359171A
- Authority
- CN
- China
- Prior art keywords
- making
- false
- laser holographic
- holographic plate
- true
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
An authenticity identification method for laser holographic plate making belongs to the technical field of laser holographic plate making identification methods; the method is characterized in that graphic information locator benchmarks are overprinted or superimposed on the laser holographic plate making region micro-constituted by random speckles; a partial enlarged photograph are obtained from the region on a holographic master plate through photomicrography to serve as the standardized phase image; during the authenticity identification, a magnifier/microscope is used to observe the conformity degree between the graphics features of a given region on the product copied by the master plate and the provided standard image so as to identify the authenticity of the laser holographic product. The identification method is simple and rapid to implement and low in cost, and is accurate.
Description
Technical field
The present invention relates to a kind of discrimination method of laser holographic plate-making, be specifically related to use the method for micro-optic processing and speckle hologram microscopic feature enforcement real and fake discrimination.
The present invention is mainly used in field of anti-counterfeit technology.
Background technology
Hologram (Hologram) is to cover primary (Gabor) to propose in 1948.Appearance along with laser instrument in 1962, sharp Leith and Upatnieks has been invented off-axis holography.1969 this (Benton) invented rainbow holography---and be the holography of display light source with the white light, this invention is walked out the laboratory for hologram and is moved towards the gratifying first step that society steps.Counterfeit in order to solve, forge this global problem, people are widely used in false proof field to holography, have obtained gratifying achievement, so far, the holographic printing industry is still occupied critical role in false proof industry.
Along with the widespread use of embossed holographic in false proof field, the holographic plate-making technology is also in diffusion.In order to tackle market competition, the holographic plate-making technology is competed between each company.On the one hand, make the holographic plate-making technology be able to develop rapidly; On the other hand, plate-making technology is decoded fast by other party.This just makes that pure is that the holographic product of false proof means is under suspicion with plate-making technology on false proof market.
In the at present main holographic false proof and discrimination method, the holographic plate-making technology of differentiating with simple instrument, instrument has:
1. Moire fringe is two blocks: can utilize the superimposed discriminating of check card of the striped that has the certain space frequency, serve as to differentiate foundation with the graph text information that occur hiding.Shortcoming is: present technique is decrypted easily, and imitation effect is suitable with legal effect.
2. laser enciphered method: directly note down a width of cloth Fresnel hologram.Can shine hologram area with laser pen during check, serve as to differentiate foundation with the graph text information that present setting on white paper.Shortcoming is: in case by counterfeit, be difficult to make real and fake discrimination at details or technical parameter.
3. optical shrink: the mode of Word message with optical shrink is recorded on the hologram, and usual naked eyes are difficult to distinguish, only more than the certain multiple just can be observed particular content under the magnifier.Differentiate that can foundation for to observe micro information.Shortcoming is: the micro information content is not easy to open; Only differentiate that whether micro information to be arranged be certificate, lack further discriminating requirement micro information.
With direct visual observations is that one or more visual observations effects or pattern in the laser holographic plate-making/authentication technique of discrimination method and color that method is mainly utilized hologram, dynamic change effect, stereovision, special pattern etc. carries out false proof discriminating.Advantage is: differentiate simply, can add enchancement factor and improve anti-counterfeit capability.Shortcoming is: need observe relatively by the comparison of the personnel that are subjected to professional training and genuine piece, be felt as the master with range estimation, lack quantitative property can be clearly as content---the false proof main points of writtenization of legal basis.
Because the holographic plate-making material has high information-bearing ability, the enchancement factor in the holographic shooting process can go on record, and these enchancement factors can not be replicated, and this just makes hologram say so theoretically and can not be copied.The main task of holographic false proof plate-making technology is utilized special technique and technology exactly, makes the not reproducible fact of hologram, and the obvious characteristic of discerning easily with subject matter production, circulation, consumption link related personnel shows.
Summary of the invention
At problems of the prior art, the invention provides a kind of information-bearing ability of utilizing hologram light sensitive material, randomness information is noted discerned, can describe the laser holographic plate-making of feature and the discrimination method of duplicate thereof when differentiating.
A kind of distinguishing method between true and false of laser holographic plate-making, it is characterized in that, chromatography or double exposure graph text information positioning reference on the laser holographic plate-making zone that is made of speckle at random on the microcosmic obtain local enlarged photograph to this zone on the holographic mother as the standardization phase image in micrographic mode; The matching degree of the graphic feature of given area and the test pattern that is provided on the product that duplicates by this mother matrix with magnifier/microscopic examination during real and fake discrimination, thus the true and false of laser holographic plate-making duplicate differentiated.
The high precision graph text information of using as positioning reference can be obtained by following method:
1) on the holographic light-sensitive version, scans or laser direct-writing with electron beam (e-beam);
2) obtain mask with electron beam (e-beam) scanning or laser direct-writing, optics copy on the holographic light-sensitive version;
3) with the mode record of optical shrink.
Described speckle is a laser speckle; Size according to following method control speckle:
Speckle is under the situation of coherent illumination, in the reflection of diffuse type or the small spot with " flicker " graininess appearance of the surperficial observed stochastic distribution of transmission, the mean diameter of speckle is: D ≈ 1.22 λ Z/D, λ is an optical maser wavelength in the formula, Z is the diameter of scattering surface, and D is that scattering surface is to the distance between the record surface.
The speckle particle average-size less than or be equivalent to the size of graph text information positioning reference character unit.Described speckle average-size is 0.002mm～0.2mm.The character unit of described graph text information positioning reference is: the Chinese character that 0.02mm～0.25mm is high, English, character or line thickness are the figure of 0.005mm～0.05mm.
Described mother matrix recording materials are a kind of in photoresist, silver halide emulsion, photopolymer, the dichromated gelatin.
Obtain the laser hologram mother matrix with usual way, carry out hologram replication according to rule.
Described mother matrix duplicates and adopts that electroforming is duplicated, a kind of in duplicating of moulding replication, laser copy.
The standardization phase image:
Amplify light path image planes place at optics and place CCD, the positioning reference and the speckle of setting regions read digitized image---the standardization phase image.The standardization phase image can be stored with digitized forms, also can output on the flat carrier.But mark recognition feature in case of necessity.
Described standardization phase image pixel 〉=500 * 300.
It is that 1/300～1/20 interference fringe replaces described speckle that the present invention further can adopt fringe density.
But described real and fake discrimination is visual observations or adopts image recognition program check sample setting regions whether to contain recognition feature that the standardization phase image had to discern the false from the genuine.
Discrimination ratio mode has two kinds:
The one, but whether sample to be tested is contained the recognition feature that the standardization phase image is had with certain multiple above magnifier or microscopic visual measurement overview setup zone.
The one, sample to be tested is obtained the digitized image of the setting regions more than certain magnification with CCD, carry out the correlativity comparison with program that is called " Figure recognition " traditionally and standardization phase image, discriminating is made decision.
Compared with prior art the present invention has following beneficial effect:
1. the present invention makes full use of the high information-bearing ability that the holographic plate-making material has, enchancement factor in addition, and making that hologram is said so theoretically can not be by imitated;
2. discrimination method of the present invention is simple, quick and precisely, expense is cheap.
Description of drawings
Fig. 1 is the synoptic diagram of the embodiment of the invention 1 regional standard phase image;
Fig. 2 is the local enlarged diagram of Fig. 1;
The local enlarged diagram of Fig. 3 embodiment of the invention 1 mother matrix duplicate;
Fig. 4 is the local enlarged diagram of Fig. 3 Fig. 1;
Fig. 5 is the synoptic diagram of the invention process case 2 regional standard phase images;
Fig. 6 is the partial enlarged drawing of Fig. 3;
Fig. 7 is the local enlarged diagram of the invention process case 2 mother matrix duplicate;
Fig. 8 is the partial enlarged drawing of Fig. 7.
Embodiment
Below in conjunction with embodiment, specify discrimination method of the present invention: among the figure, 1 is the regional standard phase image; 2 is positioning reference; 3 is speckle.
Obtaining row's height with electron beam scanning is 0.1mm, and length is the Chinese character information positioning reference mask of 10mm, carries out optics copy, exposure 100mJ/cm2 with wavelength 441.6nm laser single beam on the photoresist photosensitive material; Control speckle mean diameter is 0.02mm, hologram record, and exposure is 50mJ/cm2.Subsequent preparation process comprises operations such as development treatment, electroforming, hot pressing, makes holographic motherboard, amplifies light path image planes place at 100X and places the standardization phase image that CCD writes down out setting regions, image pixel 2048 * 1536.Color inkjet printer output image (as shown in Figure 1, 2).Make duplicate with moulding replication, its local enlarged diagram is shown in Fig. 3,4, but whether contain recognition feature that the standardization phase image had to discern the false from the genuine with 40 times of magnifier visual observations sample setting regions to be tested during discriminating, through visual observations Fig. 4 and Fig. 2, its feature is mutually attached, and duplicate is true.
Referring to accompanying drawing 5,6, with case study on implementation 1 difference be: control speckle mean diameter is 0.05mm; The standardization phase image is stored with digitized forms; Make duplicate with laser copy, its local enlarged diagram is shown in Fig. 7,8, during discriminating, amplify light path image planes place at 100X and place the digitized image that CCD obtains sample setting regions to be tested, carry out correlativity relatively with program that is called " Figure recognition " traditionally and standardization phase image, to discern the false from the genuine, through procedure identification, Fig. 8 and Fig. 6 related coefficient are greater than 0.9, and duplicate is true.
Claims (10)
1. the distinguishing method between true and false of a laser holographic plate-making, it is characterized in that, chromatography or double exposure graph text information positioning reference on the laser holographic plate-making zone that is made of speckle at random on the microcosmic obtain local enlarged photograph to this zone on the holographic mother as the standardization phase image in micrographic mode; The matching degree of the graphic feature of given area and the test pattern that is provided on the product that duplicates by this mother matrix with magnifier/microscopic examination during real and fake discrimination, thus the true and false of laser holographic plate-making duplicate differentiated.
2. the distinguishing method between true and false of laser holographic plate-making according to claim 1 is characterized in that, described speckle is a laser speckle.
3. the distinguishing method between true and false of laser holographic plate-making according to claim 1 is characterized in that, the speckle particle average-size less than or be equivalent to the size of graph text information positioning reference character.
4. according to the distinguishing method between true and false of the described laser holographic plate-making of claim 3, it is characterized in that described speckle average-size is 0.002mm～0.2mm.
5. according to the distinguishing method between true and false of the described laser holographic plate-making of claim 3, it is characterized in that the character of described graph text information positioning reference is that the high Chinese character of 0.02mm～0.25mm, English, character or line thickness are the figure of 0.005mm～0.05mm.
6. according to the distinguishing method between true and false of the described laser holographic plate-making of claim 1, it is characterized in that the mother matrix recording materials are a kind of in photoresist, silver halide emulsion, photopolymer, the dichromated gelatin.
7. according to the distinguishing method between true and false of the described laser holographic plate-making of claim 1, it is characterized in that mother matrix duplicates and adopts that electroforming is duplicated, a kind of in duplicating of moulding replication, laser copy.
8. according to the distinguishing method between true and false of the described laser holographic plate-making of claim 1, it is characterized in that standardization phase image pixel 〉=500 * 300.
9. according to the distinguishing method between true and false of the described laser holographic plate-making of claim 1, it is characterized in that, is that 1/300～1/20 interference fringe replaces described speckle with fringe density.
10. according to the distinguishing method between true and false of the described laser holographic plate-making of claim 1, it is characterized in that, but described real and fake discrimination is visual observations or adopts image recognition program check sample setting regions whether to contain recognition feature that the standardization phase image had to discern the false from the genuine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100151603A CN101359171A (en) | 2007-07-30 | 2007-07-30 | Genuine-fake identification method for laser holographic plate-making |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100151603A CN101359171A (en) | 2007-07-30 | 2007-07-30 | Genuine-fake identification method for laser holographic plate-making |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101359171A true CN101359171A (en) | 2009-02-04 |
Family
ID=40331645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100151603A Pending CN101359171A (en) | 2007-07-30 | 2007-07-30 | Genuine-fake identification method for laser holographic plate-making |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101359171A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111223388A (en) * | 2020-01-22 | 2020-06-02 | 广州市丽宝包装有限公司 | Manufacturing method for manufacturing 3D label by using photopolymer |
-
2007
- 2007-07-30 CN CNA2007100151603A patent/CN101359171A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111223388A (en) * | 2020-01-22 | 2020-06-02 | 广州市丽宝包装有限公司 | Manufacturing method for manufacturing 3D label by using photopolymer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6001510A (en) | Method for producing laser hologram anti-counterfeit mark with identifying card and inspecting card and inspecting apparatus for the mark | |
| US8625181B2 (en) | Holographic security device having diffractive image generating structures | |
| JPH10502203A (en) | Marking on optical disc to identify manufacturer | |
| EP1564605A2 (en) | Security device using a hologram reconstructing a deep image | |
| CZ2004869A3 (en) | Method of making three-dimensional picture, diffraction element and method for making thereof | |
| US6844945B2 (en) | Hologram having authenticating information recorded therein | |
| JP5041187B2 (en) | Authentication method hologram production method | |
| US9342049B2 (en) | Multi-spectral holographic security marker, method for its manufacture and holographic security system | |
| EP1785782A2 (en) | Security hologram and associated methods of use and of making | |
| CN101359171A (en) | Genuine-fake identification method for laser holographic plate-making | |
| CN103072390B (en) | Method for manufacturing and identifying digital holographic anti-counterfeiting stamp | |
| CA2358688C (en) | An optical material for use in documents of value | |
| US20080137160A1 (en) | Security Holograms | |
| JP3897318B2 (en) | Anti-counterfeit hologram and forgery hologram detection method | |
| US8227148B2 (en) | Hologram fabrication process and fabricated hologram | |
| GB2472031A (en) | Multi-spectral holographic security marker using pressure sensitive material substrate | |
| JP2013033267A (en) | Hologram fabrication process and fabricated hologram | |
| JP4810718B2 (en) | Machine reading hologram and reading apparatus to which diffraction grating pattern is applied | |
| CN215203934U (en) | Large-breadth seamless anti-counterfeiting holographic plate and manufacturing device thereof | |
| JP2004133330A (en) | Stereoscopic colored crest | |
| TW530188B (en) | Decoding and displaying method of a hologram with hidden code, and identifying equipment of the same | |
| Bjelkhagen | Improved Optical Document Security Techniques Based on Volume Holography and Lippmann Photography | |
| JP2008197335A (en) | Method for producing hologram for security | |
| JP2008065410A (en) | Information authentication method, information authentication device, and information recording medium | |
| JP2008261966A (en) | Texture by diffraction grating, and method for using the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20090204 |