CN1190192A - Polarized light encrypted holographic laser anti-fake trade mark and tis production method - Google Patents
Polarized light encrypted holographic laser anti-fake trade mark and tis production method Download PDFInfo
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- CN1190192A CN1190192A CN 97120915 CN97120915A CN1190192A CN 1190192 A CN1190192 A CN 1190192A CN 97120915 CN97120915 CN 97120915 CN 97120915 A CN97120915 A CN 97120915A CN 1190192 A CN1190192 A CN 1190192A
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Abstract
When the laser hologram is taken, a optically anisotropic birefringent cipher plate is added into the object light path and a polariscope is added into the reference light path so that the hologram has two groups of interference fringes of non-parallel polarized coherent light. The holographic laser trade mark thus produced has, other than the common trade mark pattern, interference fringe figure with polarized cipher phase data. The present invention makes holographic laser trade mark more practical and more anti-fake.
Description
The present invention relates to device and the technology of a kind of control, especially a kind of polarized light encrypted antiforge laser holographic trademark and manufacture method thereof from light intensity, color, phase place, polarization or the direction of arbitrary source.
Laser holography is applied in many-side.The laser hologram trade mark is used as anti-false trademark and uses in many products.But the antiforge laser holographic trade mark that uses is palmed off by the lawless person of this technology of grasp now.In order to improve the antiforge function of laser hologram trademark, people begin to study problem such as how to encrypt in the laser hologram trade mark, and that is for example mentioned in the CN87205139U utility model patent should " holographic trademark " is characterized in that: " the encryption interference fringe that is loaded with on the plastic sheeting is light canopy striped or has the interference fringe of random phase coding." the interference fringe mark of promptly on hologram, make maintaining secrecy.This is a kind of encryption method.The part but it still has some deficits: this " encrypts interference fringe, uses for commodity inspection department." like this, differentiate that for the ruck consumer true and false of trade mark has inconvenience more.
The purpose of this invention is to provide a kind of polarized light encrypted message that in existing laser holographic molding trademark, adds, improve its anti-counterfeit capability, ordinary consumer can be seen image by polaroid, and polarized light encrypted antiforge laser holographic trademark and manufacture method thereof that encrypted message is difficult to copy.
The present invention is achieved in that
During with the laser shooting hologram, on thing light light path, added one and had optically anisotropic birefringence cipher chips as taking thing, in the reference light light path, add polarizer, on hologram, noted the relevant Light Interference Streaks of two groups of mutual uneven polarizations in polarization direction.Such hologram just can be observed picture by polarizer.
On the structure be on the transparency material film of original laser hologram trademark except the original trademark identification pattern is arranged, also useful polarization laser is added with the interference fringe picture of polarisation password corresponding information after by cipher chips thereon.The cipher chips that is added in light path is made by methods such as injection moulding, blowing, photoetching, chemical corrosion, high energy particle impact, the polarization of electromagnetic fields, make its inner birefringence that produces, form the index distribution state of a nonlinear Distribution and everywhere thickness evenly or uneven distribution, the phase differential when making polarized light pass through it between formation O light and the e light with this.Cipher chips can be from actual life, picked at random and obtaining in a large amount of transparency (piece, sheet) with natural birefringence character or artificial birefringence producing.This cipher chips can be formed by stacking by one (sheet) or polylith (sheet).Polaroid (device) also can be made the verifier individualism of " polarized light encrypted antiforge laser holographic trademark ".
The polarized light encrypted message that is added in the polarized light encrypted antiforge laser holographic trademark of the present invention: be by the birefraction n in a slice or the transparent optical anisotropy object
o, n
eThe special distribution situation decide, claim among the present invention that this sheet (piece) transparent optical anisotropy object is " cipher chips ".And ordinary consumer utilize a polaroid (being called verifier) can from this polarized light encrypted laser trademark sign see show by encrypted message and with the diverse multicolour pattern of encrypted message, differentiate the true and false of trademark with this.Because encrypted message is difficult to copy, and reaches the purpose that prevents that others copies with this.Simultaneously, because encrypted message is only chosen and is loseed soon, also be difficult to measure with instrument, this has just more strengthened its disguise and confidentiality, the polarized light encrypted laser trademark sign of the present invention has kept original advantage of existing laser hologram trade mark fully, and has further enlarged the utility function of laser hologram trade mark.
The principles of science of the present invention mainly is the good spatial coherent property according to chromatic polarization principle in the physics and laser.Creativeness of the present invention is the spatial coherent property of chromatic polarization principle in the physics and laser is combined the false proof field that is used to improve the laser hologram trademark first.Practicality of the present invention shows that this polarized light encrypted antiforge laser holographic trademark is applicable on the original applied article of unencrypted laser hologram trademark fully, even range of application is also more extensive.
The present invention reaches accompanying drawing by the following technical programs and describes in detail and how to realize polarized light encrypted false proofly in existing laser hologram trademark, and ordinary consumer can be differentiated again.
Fig. 1 is the structural representation of trademark of the present invention.
Fig. 2 is a laser shooting index path of the present invention.
Laser shooting hologram operation stage in existing laser holographic molding making laser hologram trade mark technical matters process, adopt the method for secondary sensitization here: sensitization for the first time is the interference fringe of noting the pattern and the Word message of former required outward appearance trade mark by the common laser image pickup method on the laser photographic film.Then during sensitization for the second time, allow the beam of laser that is branched away in the laser beam pass transparent " cipher chips " again through the polarizer, because the formed nonlinear birefringence rate of anisotropy n everywhere in " cipher chips " through expanding Shu Houxian
o, n
eDistribution and everywhere the uneven distribution of thickness make the ordinary light (o light) and the extraordinary ray (e light) of advancing therebetween phase differential occur.Allow this two dephased o light of bundle and e light be mapped on the laser photographic film as thing light.Simultaneously, another Shu Jiguang that is branched away by former laser beam is mapped on the laser photographic film as reference light after expanding Shu Houjing another pair polarizer (or two polarizing prism).Above-mentioned such thing light and reference light are noted o light and e light respectively on same laser photographic film two groups of separate interference fringes, thus the full detail of o light and e light is comprised that amplitude, wavelength, phase place and phase differential, polarization direction all are recorded on the laser photographic film.Like this, the hologram that this write down has just added polarized light encrypted information.After photographic fixing, under the illumination of natural light, only cannot see any pattern, because at this moment the o light that comes from the egative film reflection of directive human eye and e light are failed stack generation chromatic polarization phenomenon with human eye.In case observe by polarizer, owing to through the stack of polarizer the chromatic polarization phenomenon taking place from egative film reflection or next o light and the e light of transmission, at this moment human eye just can be seen the multicolour pattern that is formed by the chromatic polarization phenomenon.
Above the captured laser photographic film that obtains pass through development, photographic fixing, electroforming Cheng Mo again.By the hot moulding technology interference fringe that is write down is duplicated on the thermoplastic film of aluminize (or not aluminizing) again, on this thin layer, be coated with disposable non-setting adhesive cement, just can be made into reflective (or transmission-type) anti-false trademark sign of polarized light encrypted laser hologram.
Reproduction as the time, the user want to observe polarized light encrypted information the multicolour pattern that should show, available polarizer is observed, concrete observation process is as follows: polaroid is placed on the above-mentioned polarized light encrypted antiforge laser holographic trade mark sheet top that makes, with common natural light (sunshine for example, light) irradiation, suitably around the axle rotatory polarization sheet vertical with the trade mark plate plane, natural light is formed this holographic trademark of polarized light directive of all kinds behind polaroid, and all and former laser is with this part polarized light of color diffraction by dephased o striations and e striations on the trade mark film.Behind polaroid, penetrate once more, the stack that the quadrature breakdown takes place in polaroid for the dephased o light of this ejaculation and e light produces interference, this interferes the polarized lightwave directive human eye of stack, and human eye is just seen the O light and the formed interference multicolour pattern of e light phase difference (the chromatic polarization phenomenon promptly takes place) that are caused by cipher chips.Refractive index n in this tool multicolour pattern and the cipher chips
o, n
eAnd it is thickness distribution figure situation is relevant, and don't identical.Can not know the concrete structure of " cipher chips " from the multicolour pattern of being seen.This is because laser forms interference fringe from thing-" cipher chips " to photographic film, it is the cataloged procedure of a complexity, and be that another shows sign indicating number process from the dried step striped of photographic film to observing multicolour pattern, this shows sign indicating number process is not the decode procedure of above-mentioned cataloged procedure.
Above-mentioned observation is reproduced and can be represented with accompanying drawing 1 as process: 1 among Fig. 1 represents polarizer, 2 expression plastic sheetings, the hot moulding reconstructed chart of the interference bar strand that useful laser engraves on it.3 expression aluminium coateds are as the function of reflection ray.The 4th, disposable glue layer.The 5th, commodity surface or commodity box superficial layer.AB is an incidence natural lights, and CD is an outgoing stack polarized light.R is a position of human eye.
Further introduce the concrete production run of product of the present invention below in conjunction with embodiment:
1, the production of " cipher chips ".
For a producer, select one or more pieces superimposedly to be used as required cipher chips in can be from the actual life a large amount of crystal stress slide of cipher chips randomly with birefringence feature.Also can oneself specially produce.For example make starting material with PE, PC or PS, available Shooting Technique or blown film technology are produced: when adopting Shooting Technique to produce cipher chips, as long as when mfg. moulding die, decanting point location-appropriate when the plastics of fusion plastification are gone into mould is selected, and low temperature barrier plate (post) is set suitably on the path of molten plastic flows in mould, can make the plastics that were in the fusion plastification state originally have the different flow directions and the different first rears of freezing, distribute thereby form the different non-linear stress that freezes.This stress distribution has artificial birefringence effect on optical properties.By many PE, PC or the PS injection-molded plaques (piece) that this method obtains, observe its shown optical stress pattern with the photoelasticity stress analysis instrument then.The optical stress pattern of these sheets (piece) may be different, and it is superimposed therefrom to select a slice (piece) or multi-disc, think that its optical stress pattern is suitable for promptly as " cipher chips " of the present invention.When adopting blowing drawing plastic film process to make " cipher chips ", need choose the groove shapes of extruder plastics outlet, the size of outlet straight line portion, the relative angular position of the inside and outside edge of discharge ring, blow-up ratio during the plastic foil outlet, the stretching of plastic foil is cooling line height when, the condensing temperature gradient.Make main material with PE, PC or PS, make the plastic sheeting of being produced by boasting in stretching, the different non-linear frozen strss distribution of the different formation of molecular order in the film when freezing.The plastic sheeting that obtains so also has artificial two-fold effect.Also can observe and choose that suitable one or more pieces are superimposed to be used as " cipher chips " of the present invention by the photoelastic analysis instrument, cipher chips of the present invention (piece) also can utilize photoelastic material (for example PC) to accomplish various stress analysis parts, and the moment stress distribution that is occurred when applying certain stress is used as moment " cipher chips ".
Because this cipher chips is to select at random, be again producer oneself keeping.Imitated person is unable to find identical cipher chips, particularly to the moment cipher chips, uses up promptly and dies.So imitated person just is difficult to imitated this polarized light encrypted holographic trademark sign.
2, the polarized light encrypted sheet process of taking the photograph.
Here introduce this encrypted message that how non-linear stress in " cipher chips " distributed and record the technological process that the laser photographic film gets on, 2 index path is introduced in conjunction with the accompanying drawings for this reason: 6 in the accompanying drawing 2 is laser instruments, the 7th, beam splitting semi-permeable mirror, the 8th, catoptron, the 9th, beam expander, the 10th, lens, the 11st, the polarizer (polaroid), the 12nd, cipher chips, the 13rd, laser photographic film, the 14th, two polarizing prisms, " " among the figure on the light and " 1 " expression polarization direction.
The light wave traveling process is as follows during the shooting hologram of accompanying drawing 2:
A, thing light light path:
The pencil light beam that is penetrated by laser instrument 6 is divided into two-beam behind beam splitter 7: a branch of A toward mirror 8 back reflections are widened light beam after become the quasi-parallel angle pencil of ray behind the lens 10 to beam expander 9.This quasi-parallel light beam becomes the polarized light of characteristics direction through the polarizer 11.This polarized light is penetrated through cipher chips 12.Because the birefringence of cipher chips 12, the light that incides cipher chips 12 is divided into ordinary light (o light) and extraordinary ray (e light).This o light and the velocity of propagation V of e light in cipher chips 12
o, V
eDifferent, they have had the certain phase difference ΔΦ during from cipher chips 12 outgoing, and this o light and e polarisation of light direction orthogonal (be used among the figure on the light straight line and represent with symbol " " and " 1 ").This two-beam moves on and is mapped to above the laser photographic film 13 as " thing light ".
B, reference light light path:
After another Shu Jiguang B toward mirror 8 of telling from beam splitter 7,, become the quasi-parallel angle pencil of ray through lens 10 again, become the mutually perpendicular polarized light in two bundle polarization directions through two polarizing prisms 14 again through reflexing to beam expander 9.The i.e. conduct of this polarized light is with reference on the light directive laser photographic film 13.
Above-mentioned thing light and reference light form each self-interference, the striped of o light and e light in the stack of laser egative film 13 places.Like this, just the o light in the thing light and e polarisation of light information and phase information are noted with sensitization power (light distribution) form on photographic film.
Since above-mentioned phase differential except with the birefraction n of cipher chips
o, n
eOutside distribution and thickness distribution are relevant, also relevant with the wavelength of light wave.When taking for the laser that adopts multiple color, the phase differential of various wavelength is with difference, and like this, the interference fringe on photographic film of different wave length (light color) will have feature separately.
With the above-mentioned hologram dry plate that makes is that egative film develops, photographic fixing, make caster through electroforming again, at last under uniform temperature and pressure condition, with block press with the hologram coining on the caster to the thermoplastic film who is coated with reflective aluminum, promptly make polarized light encrypted antiforge laser holographic trademark.Be affixed on disposable non-setting adhesive cement on the appropriate location of commodity or commodity packaging case, promptly become disposable anti-false trademark sign.The position stamps the cipher pattern that should show with print process near this trademark of subsides.Whether the pattern that the user is seen when observing with polaroid and this pattern that appears that is printed consistent distinguishing the true from the false, and used polaroid can be made independently verifier so that the user is convenient for carrying, or be attached on the commodity.
Narrate antiforge function of the present invention below: desire imitated person may copy from following 3 approach, but they are impossible successful:
1, obtain original " cipher chips ", this is an impossibility.
Used " cipher chips " of original production is producer's keeping, and imitated person can not obtain.
2, go to analyze from the trademark that is obtained, a cipher chips is done in attempt again: this can run into great difficulty.Should be understood that: the structure (refractive index n of cipher chips
o, n
eNonlinear Distribution) with the chromatic polarization multicolour pattern that in polarizing field, shown by it be diverse two different matters feelings, the number reason between them concerns very numerous and diverse (relating to very difficult non-linear three-dimensional matrix new mathematics theory).Like this, people are difficult to go to use the existing theory of mathematics and physics to go to know by inference the inner structure of cipher chips from the cromogram of being seen, remove imitated this cipher chips then even know the inner structure that cipher chips by inference, and this just has individual pilot production process.Because producing this cipher chips is a multifactor production run, even anti-system person's utilization optimum seeking method arranges test to produce, by the optimum seeking method Theoretical Calculation, imitated person will do 53760 tests (the theoretical calculate process is omitted) at least here, if test with the time at every turn is to do every day 4 times, will spend the imitated time in 36 years, and just might copy out second cipher chips identical and come out with the original code sheet.As seen, go to copy very difficult with this approach.
3, the trademark from being obtained duplicates with the laser reconstruction method, also can run into great difficulty in this way.Need and write down the same interferometry stability of original hologram at first, in this way.Do not know the coherence time that original recorded hologram adopts and the condition of coherent area parameter imitated person, want from another laser instrument and another light path go to transfer with the same interferometry of record original hologram be unapproachable thing.
In addition, when the record original hologram, cipher chips is a transmission-type, and the trademark of imitated person's gained is reflective, and when this reflective trade mark is known as " thing " when taking, situation is different with " thing " with transmission-type.Have again: when laser radiation to this reflective trademark, through the light of the outgoing of spreading out three kinds of compositions are arranged: illumination light, original optical information, conjugation original optical information.These three compositions make newly take the photograph hologram and original hologram changed beyond recognition.
From last surface analysis, no matter be that the antiforge function of " polarized light encrypted antiforge laser holographic trademark " of the present invention is extremely strong in theory or practice.
Claims (2)
1, a kind of manufacture method of polarized light encrypted antiforge laser holographic trademark, it is characterized in that: during with the laser shooting hologram, on thing light light path, add one and have optically anisotropic birefringence cipher chips as taking thing, in the reference light light path, add polarizer, on hologram, noted the relevant Light Interference Streaks of two groups of mutual uneven polarizations in polarization direction; Need just to can be observed picture by polarizer.
2, a kind of polarized light encrypted antiforge laser holographic trademark, form by reflection horizon, transparency material diaphragm and polaroid, it is characterized in that: except the original trademark identification pattern was arranged, also useful polarization laser was added with the interference fringe picture of polarisation password phase information after by a cipher chips thereon on the transparency material film of original laser hologram trademark.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97120915 CN1080898C (en) | 1997-10-26 | 1997-10-26 | Polarized light encrypted holographic laser anti-fake trade mark and tis production method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97120915 CN1080898C (en) | 1997-10-26 | 1997-10-26 | Polarized light encrypted holographic laser anti-fake trade mark and tis production method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1190192A true CN1190192A (en) | 1998-08-12 |
| CN1080898C CN1080898C (en) | 2002-03-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97120915 Expired - Fee Related CN1080898C (en) | 1997-10-26 | 1997-10-26 | Polarized light encrypted holographic laser anti-fake trade mark and tis production method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1080898C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1297414C (en) * | 2003-11-27 | 2007-01-31 | 中国印钞造币总公司 | Method for forming anti-counterfeit mark using non-key reproduced Moire image coding |
| CN1322989C (en) * | 1999-06-28 | 2007-06-27 | 证券票据有限公司 | Method of producing a polarisation pattern in security documents or apparatus |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006005860A1 (en) * | 2006-02-09 | 2007-08-30 | Bayer Innovation Gmbh | Method and device for producing polarization holograms |
-
1997
- 1997-10-26 CN CN 97120915 patent/CN1080898C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1322989C (en) * | 1999-06-28 | 2007-06-27 | 证券票据有限公司 | Method of producing a polarisation pattern in security documents or apparatus |
| CN1297414C (en) * | 2003-11-27 | 2007-01-31 | 中国印钞造币总公司 | Method for forming anti-counterfeit mark using non-key reproduced Moire image coding |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1080898C (en) | 2002-03-13 |
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