CN108507951A - Safe articles and its false distinguishing method and system, optical thin film and its manufacturing method - Google Patents
Safe articles and its false distinguishing method and system, optical thin film and its manufacturing method Download PDFInfo
- Publication number
- CN108507951A CN108507951A CN201810180829.2A CN201810180829A CN108507951A CN 108507951 A CN108507951 A CN 108507951A CN 201810180829 A CN201810180829 A CN 201810180829A CN 108507951 A CN108507951 A CN 108507951A
- Authority
- CN
- China
- Prior art keywords
- thin film
- optical
- optical thin
- layer
- safe articles
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/21—Polarisation-affecting properties
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/21—Polarisation-affecting properties
- G01N2021/216—Polarisation-affecting properties using circular polarised light
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Polarising Elements (AREA)
Abstract
The present invention discloses a kind of safe articles and its false distinguishing method and system, optical thin film and its manufacturing method.The safe articles identification system includes safe articles and check device, wherein check device, for providing the light that degree of polarization is not less than predetermined value to safe articles, to differentiate in safe articles whether contain optical thin film；The optical thin film includes at least one layer of optical retarder and at least one layer of circularly polarized light selective transmission layer for being set to below optical retarder, and optical retarder includes at least first area and second area with different optical anisotropic properties；In the case that check device irradiates optical thin film in different directions, different-effect is presented in optical thin film in visible-range.The present invention can be exchanged by rotating safe articles or mobile phone, the hiding information observed between negative and positive effect, so that it is determined that the true and false of safe articles.
Description
Technical field
It is the present invention relates to field of anti-counterfeit technology, more particularly to a kind of safe articles and its false distinguishing method and system, optically thin
Film and its manufacturing method.
Background technology
The light change technology changed therewith with the information of viewing angle variation Security element is to take precautions against the forgeries side such as to duplicate, scan
The effective means of formula.What this kind of optically variable anti-counterfeiting element had is easy to public identification with angle variation characteristic, contributes to from the field of circulation
Prevent the propagation of counterfeit.
Holographic technique is the representative of the light change technology changed therewith with the information of viewing angle variation Security element.However,
As light becomes the continuous development and the marketization of technology, so that light dependent element is increasingly threatened by counterfeit, gradually weaken it
As anti-fake effect.For example holographic optical becomes the market-oriented of technology and has obtained swift and violent development in recent years, holographic optical becomes product
It is readily apparent；Manufacturing technology with the optically variable pigments with angle color changeable effect is gradually popularized, and cost is also lower and lower, with
Anti-fake effect that the light of angle discoloration becomes technology is challenged.
Currently, with the high speed development of science and technology, many novel Security elements come into being, but can the public right as early as possible
It is familiar with and adapts to, and is still problem needed to be considered to make correct judgement.Therefore, in order to cope with the continuous swollen of counterfeit
It is swollen, in order to which using the counterfeit protection measures for facilitating public identification, Security element must be continuously improved and be innovated.
Invention content
In view of the above technical problem, the present invention provides a kind of safe articles and its false distinguishing method and system, optical thin films
And its manufacturing method, it is exchanged between negative and positive effect by rotating safe articles or mobile phone, the hiding information observed.
According to an aspect of the present invention, a kind of safe articles identification system, including safe articles and check device are provided,
Wherein：
Check device, for providing the light that degree of polarization is not less than predetermined value to safe articles, to differentiate in safe articles
Whether optical thin film is contained；
The optical thin film includes at least one layer of optical retarder and at least one layer circle being set to below optical retarder
Polarised light selective transmission layer, optical retarder include at least the first area and second with different optical anisotropic properties
Region；
In the case that check device irradiates optical thin film in different directions, difference is presented in optical thin film in visible-range
Effect.
In one embodiment of the invention, the first area and second area constitute patterned information；
In the case that check device irradiates optical thin film with the first irradiating state, optical thin film is presented in visible-range
Go out hiding figure line；For check device in the case where the second irradiating state irradiates optical thin film, optical thin film is in visible-range
It hides figure line and shows positive negative film conversion effect.
In one embodiment of the invention, the check device be the display screen of user terminal, indicator screen or
Person's smooth object surface.
In one embodiment of the invention, the check device is sent out in the first irradiating state and the second irradiating state
The angle of the polarization direction of light is within the scope of 70-110 degree.
According to another aspect of the present invention, a kind of optical thin film is provided, including at least one layer of optical retarder and is set to
At least one layer of circularly polarized light selective transmission layer below optical retarder, wherein：
Optical retarder includes at least first area and second area with different optical anisotropic properties；
Optical thin film is arranged in safe articles, so as to check device, is not less than for providing degree of polarization to safe articles
The light of predetermined value, to differentiate in safe articles whether contain optical thin film；
In the case that check device irradiates optical thin film in different directions, difference is presented in optical thin film in visible-range
Effect.
In one embodiment of the invention, the first area and second area constitute patterned information；
In the case that check device irradiates optical thin film with the first irradiating state, optical thin film is presented in visible-range
Go out hiding figure line；For check device in the case where the second irradiating state irradiates optical thin film, optical thin film is in visible-range
It hides figure line and shows positive negative film conversion effect.
In one embodiment of the invention, the optical anisotropic properties of the optical retarder include optical axis direction
And/or phase delay.
In one embodiment of the invention, the optical retarder first area and second area have different optical axises
Direction and identical phase delay.
In one embodiment of the invention, the optical retarder first area and second area optical axis having the same
Direction and different phase delay.
In one embodiment of the invention, the optical retarder first area and second area have different optical axises
Direction and different phase delay, the polarised light that two regions of optical thin film provide checking tool generate different optics and prolong
Late.
In one embodiment of the invention, the circularly polarized light selective transmission layer is cholesteric crystal layer or circular polarization
One kind in mating plate.
In one embodiment of the invention, the optical thin film include two layers different rotation direction cholesteric crystal layer or
Two layers of cholesteric crystal layer with different reflection peak wavelength of person.
In one embodiment of the invention, the optical retarder is nematic liquid crystal layer or optical delay is four points
One of one kind in the film of wave plate.
In one embodiment of the invention, optical retarder described in the optical thin film include the first optical retarder and
Second optical retarder, wherein：
Two layers of optical retarder is respectively distributed to the both sides of circularly polarized light selective transmission layer；
Two layers of optical retarder is respectively provided with different optically anisotropic first areas and second area.
In one embodiment of the invention, the optical thin film further includes at least one layer of and circularly polarized light selective transmission
The dark-background layer of layer contact.
According to another aspect of the present invention, a kind of safe articles are provided, including the optics as described in above-mentioned any embodiment
Film.
In one embodiment of the invention, the optical thin film is in the form of opened window safety line, transparency window, labeling and peace
Full article combines.
According to another aspect of the present invention, a kind of safe articles false distinguishing method is provided, including：
Check device provides the light that degree of polarization is not less than predetermined value to safe articles；
The effect that check device is presented by learning optical thin film in visible-range, differentiates whether contain in safe articles
Optical thin film, wherein the optical thin film includes at least one layer of optical retarder and is set to below optical retarder at least
One layer of circularly polarized light selective transmission layer, optical retarder include at least the first area with different optical anisotropic properties
And second area；In the case that check device irradiates optical thin film in different directions, optical thin film is presented in visible-range
Different-effect.
In one embodiment of the invention, the check device is sent out in the first irradiating state and the second irradiating state
The angle of the polarization direction of light is within the scope of 70-110 degree.
In one embodiment of the invention, the check device be the display screen of user terminal, indicator screen or
Person's smooth object surface.
In one embodiment of the invention, the optical thin film is the optical thin film as described in above-mentioned any embodiment.
In one embodiment of the invention, the safe articles are the safe articles as described in above-mentioned any embodiment.
According to another aspect of the present invention, a kind of method for production of optical film is provided, including：
Form at least one layer of optical retarder, wherein the optical retarder, which includes at least, has different optics respectively to different
The first area of property property and second area；
At least one layer of circularly polarized light selective transmission layer is formed, to form the optical thin film, wherein check device is not with
In the case of equidirectional irradiation optical thin film, different-effect is presented in optical thin film in visible-range.
In one embodiment of the invention, the circularly polarized light selective transmission layer is cholesteric crystal layer or circular polarization
One kind in mating plate.
In one embodiment of the invention, the optical retarder is nematic liquid crystal layer or optical delay is four points
One of one kind in the film of wave plate.
In one embodiment of the invention, the optical thin film is the optical thin film as described in above-mentioned any embodiment.
In one embodiment of the invention, the method for production of optical film further includes：
Form at least one layer of dark-background layer contacted with circularly polarized light selective transmission layer.
The present invention can be exchanged by rotating safe articles or mobile phone, the hiding information observed between negative and positive effect, from
And determine the true and false of safe articles.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is the schematic diagram of safe articles identification system one embodiment of the present invention.
Fig. 2 is the schematic diagram of safe articles false distinguishing method one embodiment of the present invention.
Fig. 3 is the schematic diagram of optical thin film one embodiment of the present invention.
Fig. 4 is the schematic diagram of method for production of optical film one embodiment of the present invention.
Fig. 5 is the schematic diagram of another embodiment of method for production of optical film of the present invention.
Fig. 6 is the schematic diagram of the another embodiment of method for production of optical film of the present invention.
Fig. 7 is the schematic diagram of method for production of optical film another embodiment of the present invention.
Fig. 8 is the schematic diagram of another embodiment of optical thin film of the present invention.
Fig. 9 is the schematic diagram of the another embodiment of optical thin film of the present invention.
Figure 10 is the schematic diagram of optical thin film another embodiment of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Below
Description only actually at least one exemplary embodiment is illustrative, is never used as to the present invention and its application or makes
Any restrictions.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, shall fall within the protection scope of the present invention.
Unless specifically stated otherwise, positioned opposite, the digital table of the component and step that otherwise illustrate in these embodiments
It is not limited the scope of the invention up to formula and numerical value.
Simultaneously, it should be appreciated that for ease of description, the size of attached various pieces shown in the drawings is not according to reality
Proportionate relationship draw.
Technology, method and apparatus known to person of ordinary skill in the relevant may be not discussed in detail, but suitable
In the case of, the technology, method and apparatus should be considered as authorizing part of specification.
In shown here and discussion all examples, any occurrence should be construed as merely illustrative, without
It is as limitation.Therefore, the other examples of exemplary embodiment can have different values.
It should be noted that：Similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined, then it need not be further discussed in subsequent attached drawing in a attached drawing.
It is found by the applicant that：In a technical solution, the Security element of material can be become using liquid crystal layer as light.At this
In Security element, the sightless pattern of naked eyes is formed with the left-handed liquid crystal material of same color and dextrorotation liquid crystal material chromatography, is passed through
When circular polarizing disk observes the Security element, since the liquid crystal material of different rotation directions is to the reflected intensity of the polarised light of same rotation direction
There are difference, it will thus be seen that the different lines of light and shade, pattern, to identify the sightless implicit pattern of naked eyes.But this
Accurate chromatography is needed in kind Security element manufacturing process, the requirement to printing equipment chromatography precision is very high, and additional circle is inclined
The use of piece of shaking is unfavorable for public identification.
In another technical solution, the Security element based on polarization luminous effect may be used, which contains linear light
Polymeric material layer (PPN), by the stepper exposure of linear polarized uv, the different zones of linearly photopolymerization material layer generate not
Equidirectional orientation, covers one layer of liquid crystal prepolymer (LCP) on PPN layers, and liquid crystal molecule is arranged along PPN differently-s oriented directivity
Crosslinking curing is arranged and is carried out under action of ultraviolet light, being formed has optically anisotropic birefringent phase retardation layer.By inclined
The piece that shakes is observed that hiding information, rotatory polarization piece or Security element, hiding information are exchanged between negative and positive.Although the invention
Security element have through the identifiable fine hiding information feature of polarizing film, there is very high anti-fake difficulty and anti-fake water
It is flat, but since the inconvenient for use of polarizing film identifies in masses, influence its practical antifalse effect.
Therefore, applicants have invented a kind of optical thin film and its false distinguishing method and system, fine negative and positive information in of the invention
Feature can break away from the limitation of polarizing film, it is public can be by the mobile phone energy fine negative and positive information of Direct Recognition that almost everybody has
Feature realizes that the effect of hiding information domination, antiforge function are greatly promoted.
Fig. 1 is the schematic diagram of safe articles identification system one embodiment of the present invention.As shown in Figure 1, the safe articles
Identification system may include safe articles 1 and check device 2, wherein：
Check device 2, for providing the light that degree of polarization is not less than predetermined value to safe articles 1, to differentiate safe articles 1
In whether contain optical thin film.
In one embodiment of the invention, the predetermined value is 15%.Check device 2 provides degree of polarization and is not less than 15%
Light.
" degree of polarization " is the ratio of the luminous intensity and entire luminous intensity of polarized portion in light beam.Degree of polarization is measurement electromagnetic wave
The parameter of middle polarization degree is polarised light ratio shared in total light intensity.In general, degree of polarization is in 0 (natural light) and 1
Change between (full polarization).General P=1, referred to as polarization completely, polarization state do not change over, such as linear polarization, circular polarization, ellipse
Circular polarization；P=0, it is referred to as completely unpolarized, such as natural light；0<P<1 is partial polarization, and polarization state changes over time.It is completely non-
Polarised light and the partial polarization just average description to counting within a certain period of time.
The optical thin film includes at least one layer of optical retarder and at least one layer circle being set to below optical retarder
Polarised light selective transmission layer, optical retarder include at least the first area and second with different optical anisotropic properties
Region.
In one embodiment of the invention, the first area and second area constitute patterned information.
Check device 2, in the case of irradiating optical thin film in different directions, optical thin film is in visible-range
Existing different-effect.
In one embodiment of the invention, check device 2 is specifically used for irradiating optical thin film with the first irradiating state
In the case of, optical thin film shows hiding figure line in visible-range；Check device 2 is irradiated optically thin in the second irradiating state
In the case of film, optical thin film hides figure line in visible-range and shows positive negative film conversion effect.It therefore, can be by
It is no to observe hiding figure line accordingly and positive negative film conversion effect to judge in safe articles whether to include corresponding optical thin film.
In one embodiment of the invention, the optical thin film is in the form of opened window safety line, transparency window, labeling and peace
Full article 1 combines, and verifies optical thin film by checking tool, determines the true and false of valuables.
In a preferred embodiment of the invention, the predetermined value is 20%.Check device 2 provides degree of polarization and is not less than
20% light.The light with certain degree of polarization produces polarised light by optical thin film, the different region of optical thin film
Raw different optical delay.
In another preferred embodiment of the present invention, the predetermined value is 30%.Check device 2 provides degree of polarization and is not less than
30% light.The light with certain degree of polarization produces polarised light by optical thin film, the different region of optical thin film
Raw different optical delay.
In one embodiment of the invention, the check device 2 is sent out in the first irradiating state and the second irradiating state
Go out the angle of the polarization direction of light within the scope of 70-110 degree, preferably 90 °.
Based on the safe articles identification system that the above embodiment of the present invention provides, fine negative and positive information characteristics energy can be passed through
The limitation of polarizing film is broken away from, thus public screen that can be by terminals such as mobile phones that almost everybody has, smooth object surface,
Can the fine negative and positive information characteristics of Direct Recognition, realize hiding information domination effect, the above embodiment of the present invention it is anti-fake
Function is greatly promoted.
In one embodiment of the invention, the check device 2 is the display screen of user terminal (such as mobile phone), shows
Show device screen or smooth object surface.
In this preferred embodiment of the present invention preferred embodiment, the check device 2 is mobile phone display screen.
The above embodiment of the present invention by indicator screen send out the light with certain degree of polarization can be observed it is optically thin
Hiding information in film, rotates optical thin film or mobile phone, the information observed are exchanged between negative and positive effect.
With the rapid development of information technology, the popularity rate of mobile phone especially smart mobile phone is continuously improved, people has almost been arrived
The stage of one mobile phone of hand.Mobile phone has become mass-communication, communication and understands the essential tool of external information, hand in real time
Machine has played increasingly important role in public life.In the above embodiment of the present invention, it is attached to anti-on valuable commodity
The wherein hiding anti-counterfeiting information of pseudo- element can be optically thin thus, it is possible to play to the full extent by the handset identity of human hand one
The effect of film Security element, while eliminating consumer or the unnecessary additional checking tool burden of valuables manufacturer.
In one embodiment of the invention, check device 2 can be also used for prestoring optical thin film and comprising the light
The correspondence of the safe articles of film is learned, as shown in table 1, wherein a kind of optical thin film corresponds to unique optical thin film and identifies,
A kind of safe articles correspond to unique safe articles mark.
Table 1
| Safe articles identify | Optical thin film identifies |
| Safe articles 1 | Optical thin film a |
| Safe articles 2 | Optical thin film a |
| Safe articles 3 | Optical thin film b |
| Safe articles 4 | Optical thin film c |
| … | … |
Detection device 2 can be also used for prestoring optical thin film and the corresponding anti-counterfeiting characteristic of the optical thin film, such as table 2
It is shown, wherein each optical thin film corresponds to particular kind of anti-counterfeiting characteristic.
Table 2
In an embodiment of the invention, detection device 2 can in advance be detected various optical thin films, to obtain light
Film and the correspondence (as shown in table 1) and optical thin film of the safe articles comprising the optical thin film and its anti-fake spy
The correspondence (as shown in table 2) for anti-fake reference data of seeking peace.
In an alternative embodiment of the invention, as shown in Figure 1, the safe articles identification system can also include server,
Wherein：
Detection device 2 from server brought into optical film and can also include the peace of the optical thin film with predetermined time interval
The full correspondence (as shown in table 1) of article and the correspondence of optical thin film and its anti-counterfeiting characteristic and anti-fake reference data
(as shown in table 2).
In one embodiment of the invention, safe articles can be valuables, more valuable
Article may include valuable license, commodity sign or commodity packaging etc..Wherein, the valuable license includes banknote, stock, card
Book, check, credit card, identity card, passport, admission ticket or air ticket etc..
In one embodiment of the invention, safe articles can be paper or plastic basis material, paper representing value or certificate.
As shown in Figure 1, detection device 2 can carry out true and false discriminating to safe articles, whether to identify the safe articles
It is true.
Detection device 2 is for obtaining the corresponding optical thin film mark of safe articles；It is identified and is determined according to the optical thin film
Corresponding optical thin film, anti-counterfeiting characteristic；Anti-counterfeiting signal corresponding with the anti-counterfeiting characteristic is obtained from article to be measured；Described in judgement
Whether anti-counterfeiting signal is consistent with the anti-counterfeiting characteristic；In the case where the anti-counterfeiting signal is consistent with the anti-counterfeiting characteristic, judgement
The safe articles include the optical thin film, that is, judge that the safe articles are genuine safe articles.
The above embodiment of the present invention can pass through mobile phone, computer screen and other indicator screens, especially portable hand
The polarised light that machine screen is sent out verifies the hiding information in optical thin film, rotates optical thin film or mobile phone, that observes hides
Information is exchanged between negative and positive effect.So that it is determined that the true and false of safe articles.
Fig. 2 is the schematic diagram of safe articles false distinguishing method one embodiment of the present invention.Preferably, the present embodiment can be by this hair
Bright safe articles identification system executes.As shown in Fig. 2, the method may include：
Step 21, check device 2 provides the light that degree of polarization is not less than predetermined value to safe articles 1.
In one embodiment of the invention, the check device 2 be the display screen of user terminal, indicator screen,
Or smooth object surface.
In one embodiment of the invention, the optical thin film is the optical thin film as described in above-mentioned any embodiment.
In one embodiment of the invention, the safe articles 1 are the safe articles as described in above-mentioned any embodiment
1。
Step 22, the effect that check device 2 is presented by learning optical thin film in visible-range, differentiates safe articles 1
In whether contain optical thin film, wherein the optical thin film includes at least one layer of optical retarder 11 and is set to optical delay
Layer 11 below at least one layer of circularly polarized light selective transmission layer 12, optical retarder 11 include at least have different optics respectively to
The first area 111 of anisotropic property and second area 112；In the case that check device 2 irradiates optical thin film in different directions, light
It learns film and different-effect is presented in visible-range.
In one embodiment of the invention, in the case that check device irradiates optical thin film with the first irradiating state, light
It learns film and shows hiding figure line in visible-range；Check device is the case where the second irradiating state irradiates optical thin film
Under, optical thin film hides figure line in visible-range and shows positive negative film conversion effect, wherein the check device 2 is first
The angle of the polarization direction of irradiating state and the second irradiating state emitted light is within the scope of 70-110 degree.
Based on the safe articles false distinguishing method that the above embodiment of the present invention provides, can be put by fine negative and positive information characteristics
The limitation of de- polarizing film, thus public screen that can be by terminals such as mobile phones that almost everybody has, smooth object surface, just
The energy fine negative and positive information characteristics of Direct Recognition, realize the effect of hiding information domination, the anti-fake work(of the above embodiment of the present invention
It can be greatly promoted.
According to another aspect of the present invention, a kind of safe articles 1 are provided, including the optics as described in above-mentioned any embodiment
Film.
In one embodiment of the invention, the safe articles 1 can be valuables, and the valuables can wrap
Include valuable license, commodity sign or commodity packaging etc..Wherein, the valuable license includes banknote, stock, certificate, check, credit
Card, identity card, passport, admission ticket or air ticket etc..
Based on the safe articles that the above embodiment of the present invention provides, the safe articles include optical thin film, can be passed through
Identify that optical thin film realizes that the false distinguishing to safe articles, the above embodiment of the present invention can be put by fine negative and positive information characteristics
The limitation of de- polarizing film, thus public screen that can be by terminals such as mobile phones that almost everybody has, smooth object surface, just
The energy fine negative and positive information characteristics of Direct Recognition, realize the effect of hiding information domination, the anti-fake work(of the above embodiment of the present invention
It can be greatly promoted.
The structure of optical thin film in the above embodiment of the present invention is further described below by specific embodiment.
Fig. 3 is the schematic diagram of optical thin film one embodiment of the present invention.As shown in figure 3, the optical thin film 1 of Fig. 1 embodiments
May include at least one layer of optical retarder 11 and at least one layer of circularly polarized light being set to below optical retarder 11 selectivity
Transmission layer 12, wherein：
Optical retarder 11 includes at least first area 111 and second area with different optical anisotropic properties
112.First area 111 and second area 112 constitute patterned information, patterned information include be not limited to pattern, word,
Symbol, number.
In one embodiment of the invention, the optical anisotropic properties of the optical retarder 11 include optical axis direction
And/or phase delay.
In one embodiment of the invention, 11 first area 111 of the optical retarder and second area 112 have not
Same optical axis direction and identical phase delay.
In one embodiment of the invention, 11 first area 111 of the optical retarder and second area 112 have phase
Same optical axis direction and different phase delay.
In one embodiment of the invention, 11 first area 111 of the optical retarder and second area 112 have not
Two regions of same optical axis direction and different phase delay, optical thin film generate difference to the polarised light that checking tool provides
Optical delay.
Thus the above embodiment of the present invention is total, and two regions of optical thin film generate not the polarised light that checking tool provides
With optical delay, to generate naked eyes can Direct Recognition contrast effect.
Optical thin film is arranged in safe articles 1, so as to check device 2, for providing degree of polarization not to safe articles 1
Less than the light of predetermined value, to differentiate in safe articles 1 whether contain optical thin film.
In the case that check device 2 irradiates optical thin film in different directions, optical thin film is presented not in visible-range
Same effect.
In one embodiment of the invention, the first area 111 and second area 112 constitute patterned information.
In the case that check device 2 irradiates optical thin film with the first irradiating state, optical thin film is in visible-range
Reveal hiding figure line information；For check device 2 in the case where the second irradiating state irradiates optical thin film, optical thin film is in visible light
Figure line information is hidden in range shows positive negative film conversion effect.
In one embodiment of the invention, the circularly polarized light selective transmission layer 12 is that cholesteric crystal layer or circle are inclined
The one kind shaken in mating plate.Preferably cholesteric crystal layer.
In one embodiment of the invention, the optical thin film may include the cholesteric liquid crystal of two layers of different rotation direction
Layer, to improve the brightness of optical thin film.When checking tool checks, the observation of pattern included to optical retarder can be improved
Clarity.
In another embodiment of the invention, the optical thin film can be with two layers of cholesteric phase with different reflection peak wavelength
Liquid crystal layer, to improve the brightness of optical thin film.When checking tool checks, pattern included to optical retarder can be improved
Observe clarity.
In one embodiment of the invention, the optical retarder 11 is nematic liquid crystal layer or optical delay is four
One kind in the film of/mono- wave plate.Preferably nematic liquid crystal layer.
Optical thin film, the base material suitable for being coated with the various formula solutions of the present invention, ink are manufactured in the above embodiment of the present invention
Preferably transparent plastic.The transparent plastic can be PE (PE polyethylene, polyethylene), PP (Polypropylene,
Polypropylene), PET (Ethylene Terephthalare, polyethylene terephthalate), PS (Polystyrene, polyphenyl
Ethylene), PVC (Polyvinylchlorid, polyvinyl chloride), PA (Polyamide, polyamide), PC (Polycarbonate, gather
Carbonic ester), the materials such as BOPP (Biaxially Oriented Polypropylene, bidirectional stretching polypropylene film).
Such as：In Fig. 1 embodiments, base material PET.
Based on the optical thin film that the above embodiment of the present invention provides, it can be arranged in the safe articles of genuine piece, thus may be used
With by identifying that optical thin film realizes that the false distinguishing to safe articles, the above embodiment of the present invention can pass through fine negative and positive information spy
Sign can break away from the limitation of polarizing film, thus public screen that can be by terminals such as mobile phones that almost everybody has, smooth object
Surface, the energy fine negative and positive information characteristics of Direct Recognition, realizes the effect of hiding information domination, the above embodiment of the present invention
Antiforge function is greatly promoted.
Fig. 4 is the schematic diagram of method for production of optical film one embodiment of the present invention.Preferably, the present embodiment can be used for
Manufacture the optical thin film described in any of the above-described embodiment.As shown in figure 4, the method may include：
Step 41, at least one layer of optical retarder 11 is formed, wherein the optical retarder 11, which includes at least, has difference
The first area 111 of optical anisotropic properties and second area 112.
In one embodiment of the invention, the optical retarder 11 is nematic liquid crystal layer or optical delay is four
One kind in the film of/mono- wave plate.
Step 42, at least one layer of circularly polarized light selective transmission layer 12 is formed, to form the optical thin film, wherein inspection
It looks into the case that device 2 irradiates optical thin film in different directions, different-effect is presented in optical thin film in visible-range.
In one embodiment of the invention, the circularly polarized light selective transmission layer 12 is that cholesteric crystal layer or circle are inclined
The one kind shaken in mating plate.
In one embodiment of the invention, step 42 may include：It is coated with cholesteric liquid crystal in nematic liquid crystal layer surface
Pre-polymer solution is cured cholesteric liquid crystal layer with ultraviolet light after drying and removing solvent；Alternatively, compound in nematic liquid crystal layer surface
Circular polarizing disk forms circularly polarized light selective transmission layer.
The method for production of optical film provided based on the above embodiment of the present invention, it is possible to produce the above embodiment of the present invention
Optical thin film, the optical thin film can be arranged in the safe articles of genuine piece, and thus the above embodiment of the present invention can lead to
Cross false distinguishing of the identification optical thin film realization to safe articles.The above embodiment of the present invention can pass through fine negative and positive information characteristics energy
The limitation of polarizing film is broken away from, thus public screen that can be by terminals such as mobile phones that almost everybody has, smooth object surface,
Can the fine negative and positive information characteristics of Direct Recognition, realize hiding information domination effect, the above embodiment of the present invention it is anti-fake
Function is greatly promoted.
Fig. 5 is the schematic diagram of another embodiment of method for production of optical film of the present invention.Preferably, the present embodiment can be used for
Optical thin film described in any of the above-described embodiment (such as Fig. 3 embodiments) of the manufacture present invention.As shown in figure 5, the method can be with
Including：
Step 51, it rubs to substrate surface, the frictional direction of two different zones uses compressed air at 75-105 °
Substrate surface is cleaned.
Step 52, it is coated with nematic liquid crystal pre-polymer solution in substrate surface, dries and removes solvent, uses under an inert atmosphere
Ultraviolet light is by liquid crystal pre-polymers crosslinking curing.
Step 53, it is coated with cholesteric liquid crystal pre-polymer solution in nematic liquid crystal layer surface, dried and removed after solvent with ultraviolet
Light cures cholesteric liquid crystal layer.
Fig. 6 is the schematic diagram of the another embodiment of method for production of optical film of the present invention.Preferably, the present embodiment can be used for
Optical thin film described in any of the above-described embodiment (such as Fig. 3 embodiments) of the manufacture present invention.As shown in fig. 6, the method can be with
Including：
Step 61, it is coated with certain density photosensitive polymer solution on base material, dries and removes solvent, is put above coating
The photomask with required picture and text pattern is set, irradiates linear photopolymer layer with the linear polarized uv of certain orientation, this
Sample, the linearly photopolymerization object molecule being irradiated by light to region will be arranged according to the direction of polarised light；Then mask is removed
Version exposes linearly photopolymerization nitride layer with the linear polarized uv in other direction again.
Step 62, it is coated with nematic liquid crystal pre-polymer solution on linear photopolymerization layer surface, solvent is dried and removed, in inertia
With ultraviolet light by liquid crystal pre-polymers crosslinking curing under atmosphere, the liquid crystal molecule with birefringence is selected according in different directions
Property orientation linearly photopolymerization material direction arrangement, to being loaded with hiding information in Security element.
Step 63, it is coated with cholesteric liquid crystal pre-polymer solution in nematic liquid crystal layer surface, dried and removed after solvent with ultraviolet
Light cures cholesteric liquid crystal layer；Alternatively, in the compound circular polarizing disk of nematic liquid crystal layer surface, circularly polarized light selective transmission is formed
Layer.
Fig. 7 is the schematic diagram of method for production of optical film another embodiment of the present invention.Preferably, the present embodiment can be used for
Optical thin film described in any of the above-described embodiment (such as Fig. 3 embodiments) of the manufacture present invention.As shown in fig. 7, the method can be with
Including：
Step 71, it is two PET films that quarter-wave plate and optical axis are mutually 90 degree to choose optical delay, with certain figure
The mold of case is respectively die cut two PET, and first PET is die cut to the negative image for the positive image part and second PET to be formed
Coincidence that part is seamless forms two optical anisotropy regions with different optical axis directions.
Step 72, it is coated with cholesteric liquid crystal pre-polymer solution on the PET of another biaxial tension, is used after drying and removing solvent
Ultraviolet light cures cholesteric liquid crystal layer.
Step 73, the retardation film with different optical axis directions is formed with the Film laminated of cholesteric liquid crystal layer
The optical thin film of the present invention.
The above embodiment of the present invention can pass through mobile phone, computer screen and other indicator screens, especially portable hand
Hiding information in the polarised light verification optical thin film that machine screen is sent out, rotates optical thin film or mobile phone, the hiding letter observed
Breath exchanges between negative and positive effect.So that it is determined that the true and false of safe articles.
Fig. 8 is the schematic diagram of another embodiment of optical thin film of the present invention.Embodiment is compared as shown in figure 3, Fig. 8 embodiments
Optical thin film can also include at least one layer of dark-background layer 13 contacted with circularly polarized light selective transmission layer 12 and be located at
Adhesive layer 14 between circularly polarized light selective transmission layer 12 and optical retarder 11, wherein：
Adhesive layer 14, the Film laminated for that will have the retardation film of different optical axis directions with carry cholesteric liquid crystal layer
Together.
Dark-background layer 13 is formed in a kind of cholesteric liquid crystal layer (circularly polarized light selective transmission layer) surface, dark-background layer
The regional area for being present in cholesteric liquid crystal layer in the form of characters cut in relief or characters cut in intaglio may be selected.
Dark-background layer 13, for absorbing the light through cholesteric liquid crystal layer, to improve masses' checking tool ratio
To the vision definition of pattern when such as mobile phone inspection optical thin film, while having the optical thin film of dark-background layer in different sights
The light for examining angle reflection different wave length, has the optically variable effect to change colour with angle.
Optical retarder 11 and the forming method of circularly polarized light selective transmission layer 12 can adopt in Fig. 8 embodiments of the present invention
With the method for production of optical film of Fig. 4-Fig. 7 any embodiments.
Fig. 9 is the schematic diagram of the another embodiment of optical thin film of the present invention.Compared with embodiment illustrated in fig. 8, Fig. 9 embodiments
In optical thin film, dark-background layer 13 is specifically as follows blue background layer；Circularly polarized light selective transmission layer 12 is specifically as follows
Cholesteric liquid crystal layer；Optical retarder 11 is specifically as follows nematic liquid crystal layer.
The base material of optical thin film is PP in Fig. 9 embodiments.The adhesive layer 14 is located at below blue background layer.
The manufacturing method of Fig. 9 embodiment optical thin films may include：By specification above-described embodiment (such as Fig. 4-Fig. 7 appoints
One embodiment) described in method be respectively formed photosensitive oriented layer, nematic liquid crystal layer and cholesteric liquid crystal layer (from vertical on the surfaces PP
For viewing angle to tilting, cholesteric liquid crystal layer reflects red and green light), and it is coated with blue oil in cholesteric liquid crystal layer surface
Ink, drying are coated with glue in ink pellet surface, dry, form adhesive layer, form optical thin film as of fig. 9 shown.
This optical thin film can be cut into safety line by the above embodiment of the present invention, and paper is attached in paper-making process
In, form opened window safety line.The above embodiment of the present invention is by this paper close to computer screen, it can be clearly seen that in safety line
Hiding information, rotate paper, hiding information switches between negative and positive effect, from normal viewing angles to inclination, safe line reflection
The light of carmetta and green, shows the optically variable effect to change colour with angle.
In an embodiment of the invention, labeling can be made in the optical thin film described in Fig. 9 embodiments, using adhesive layer
This labeling is attached to commodity surface by 14.Consumer, to light mobile phone screen, selects white screen, by mobile phone when buying commodity
When being inclined to labeling with 45° angle, it can be clearly seen that the goods marks implied in labeling rotates mobile phone, and trade mark is in negative and positive effect
Between exchange.From normal viewing angles to inclination, labeling reflects the light of carmetta and green, shows and becomes effect with the light that angle changes colour
Fruit.
In one embodiment of the invention, the optical retarder 11 includes that the first optical retarder and the second optics prolong
Slow layer, wherein two layers of optical retarder 11 is respectively distributed to the both sides of circularly polarized light selective transmission layer 12.Described two layers
Optical retarder 11 is respectively provided with different optically anisotropic first areas 111 and second area 112.
Figure 10 is the schematic diagram of optical thin film another embodiment of the present invention.Compared with embodiment illustrated in fig. 9, Figure 10 embodiments
Optical thin film in, the optical thin film may include two groups of photosensitive oriented layer, nematic liquid crystal layer and cholesteric liquid crystal layer, Figure 10
The base material of optical thin film is PVC in embodiment.
The manufacturing method of Figure 10 embodiment optical thin films may include：
The first, the method described in by specification above-described embodiment (such as Fig. 4-Fig. 7 any embodiments) is distinguished in PVC surface
Form photosensitive oriented layer, nematic liquid crystal layer 1 and cholesteric liquid crystal layer 1, another PVC surface be respectively formed photosensitive oriented layer, to
Row phase liquid crystal layer 2 and cholesteric liquid crystal layer 2.
The second, nematic liquid crystal layer 1 and nematic liquid crystal layer 2 are respectively provided with different information, cholesteric liquid crystal layer 1 and cholesteric
Liquid crystal layer 2 reflects the visible light of different wavelength respectively, and glue is coated on 1 surface of cholesteric liquid crystal layer, dry, optically thin by two
Film is compound, forms optical thin film as shown in Fig. 10, this optical thin film is compounded on the paper of trepanning, forms transparency window.
Mobile phone is placed on the underface of transparency window by the above embodiment of the present invention, it can be clearly seen that hiding on optical thin film
Information；Mobile phone is rotated, information is exchanged between negative and positive effect, and the another side of transparency window is placed on to the surface of mobile phone, it can be seen that another
Outer information, rotates mobile phone, and information is exchanged between negative and positive effect.
Liquid crystal material suitable for the above embodiment of the present invention optical thin film Security element can come from commercially produced product, all
The liquid crystal series production that such as product of MERCK, BASF, WACKER, ROLIC company, especially ROLIC and MERCK companies provide
Product.
So far, the present invention is described in detail.In order to avoid the design of the masking present invention, it is public that this field institute is not described
Some details known.Those skilled in the art as described above, can be appreciated how to implement technology disclosed herein completely
Scheme.
One of ordinary skill in the art will appreciate that realizing that all or part of step of above-described embodiment can pass through hardware
It completes, relevant hardware can also be instructed to complete by program, the program can be stored in a kind of computer-readable
In storage medium, storage medium mentioned above can be read-only memory, disk or CD etc..
Description of the invention provides for the sake of example and description, and is not exhaustively or will be of the invention
It is limited to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.It selects and retouches
It states embodiment and is to more preferably illustrate the principle of the present invention and practical application, and those skilled in the art is enable to manage
Various embodiments with various modifications of the solution present invention to design suitable for special-purpose.
Claims (21)
1. a kind of safe articles identification system, which is characterized in that including safe articles and check device, wherein：
Check device, for providing the light that degree of polarization is not less than predetermined value to safe articles, with differentiate in safe articles whether
Contain optical thin film；
The optical thin film includes at least one layer of optical retarder and at least one layer of circular polarization for being set to below optical retarder
Light selective transmission layer, optical retarder include at least first area and the secondth area with different optical anisotropic properties
Domain；
In the case that check device irradiates optical thin film in different directions, different effects are presented in optical thin film in visible-range
Fruit.
2. safe articles identification system according to claim 1, which is characterized in that
The first area and second area constitute patterned information；
In the case that check device irradiates optical thin film with the first irradiating state, optical thin film shows hidden in visible-range
Hide figure line；Check device in the case where the second irradiating state irradiates optical thin film, in visible-range hide by optical thin film
Figure line shows positive negative film conversion effect.
3. safe articles identification system according to claim 1 or 2, which is characterized in that
The check device is display screen, indicator screen or the smooth object surface of user terminal.
4. safe articles identification system according to claim 1 or 2, which is characterized in that
The check device the polarization direction of the first irradiating state and the second irradiating state emitted light angle in 70-
Within the scope of 110 degree.
5. a kind of optical thin film, which is characterized in that including at least one layer of optical retarder and be set to below optical retarder
At least one layer of circularly polarized light selective transmission layer, wherein：
Optical retarder includes at least first area and second area with different optical anisotropic properties；
Optical thin film is arranged in safe articles, so as to check device, for providing degree of polarization not less than predetermined to safe articles
The light of value, to differentiate in safe articles whether contain optical thin film；
In the case that check device irradiates optical thin film in different directions, different effects are presented in optical thin film in visible-range
Fruit.
6. optical thin film according to claim 5, which is characterized in that
The first area and second area constitute patterned information；
In the case that check device irradiates optical thin film with the first irradiating state, optical thin film shows hidden in visible-range
Hide figure line；Check device in the case where the second irradiating state irradiates optical thin film, in visible-range hide by optical thin film
Figure line shows positive negative film conversion effect.
7. optical thin film according to claim 5 or 6, which is characterized in that the optical anisotropy of the optical retarder
Property includes optical axis direction and/or phase delay.
8. optical thin film according to claim 7, which is characterized in that
The optical retarder first area and second area have different optical axis directions and identical phase delay；
Or,
The optical retarder first area and second area optical axis direction having the same and different phase delay；
Or, the optical retarder first area and second area have different optical axis directions and different phase delay, light
The polarised light that two regions of film provide checking tool generates different optical delay.
9. optical thin film according to claim 5 or 6, which is characterized in that
The circularly polarized light selective transmission layer is one kind in cholesteric crystal layer or circularly polarizing plate.
10. optical thin film according to claim 9, which is characterized in that cholesteric crystal layer including two layers of different rotation direction,
Or two layers of cholesteric crystal layer with different reflection peak wavelength.
11. optical thin film according to claim 5 or 6, which is characterized in that
One kind in the film that the optical retarder is nematic liquid crystal layer or optical delay is quarter-wave plate.
12. optical thin film according to claim 5 or 6, which is characterized in that the optical retarder is prolonged including the first optics
Slow layer and the second optical retarder, wherein：
Two layers of optical retarder is respectively distributed to the both sides of circularly polarized light selective transmission layer；
Two layers of optical retarder is respectively provided with different optically anisotropic first areas and second area.
13. optical thin film according to claim 5 or 6, which is characterized in that further include that at least one layer of and circularly polarized light selects
Property transmission layer contact dark-background layer.
14. a kind of safe articles, which is characterized in that include the optical thin film as described in any one of claim 5-13.
15. safe articles according to claim 14, which is characterized in that the optical thin film is with opened window safety line, transparent
Window, labeling form combined with safe articles.
16. a kind of safe articles false distinguishing method, which is characterized in that including：
Check device provides the light that degree of polarization is not less than predetermined value to safe articles；
The effect that check device is presented by learning optical thin film in visible-range, differentiates in safe articles whether contain optics
Film, wherein the optical thin film includes at least one layer of optical retarder and at least one layer that is set to below optical retarder
Circularly polarized light selective transmission layer, optical retarder include at least first area and the with different optical anisotropic properties
Two regions；In the case that check device irradiates optical thin film in different directions, difference is presented in optical thin film in visible-range
Effect.
17. safe articles false distinguishing method according to claim 16, which is characterized in that
In the case that check device irradiates optical thin film with the first irradiating state, optical thin film shows hidden in visible-range
Hide figure line；
For check device in the case where the second irradiating state irradiates optical thin film, optical thin film hides figure line in visible-range
Show positive negative film conversion effect；
Check device the polarization direction of the first irradiating state and the second irradiating state emitted light angle in 70-110 degree
In range.
18. safe articles false distinguishing method according to claim 16 or 17, which is characterized in that
The check device is display screen, indicator screen or the smooth object surface of user terminal；
And/or
The optical thin film is the optical thin film as described in any one of claim 5-13；
And/or
The safe articles are the safe articles as described in claims 14 or 15.
19. a kind of method for production of optical film, which is characterized in that including：
Form at least one layer of optical retarder, wherein the optical retarder, which includes at least, has different optical anisotropies
The first area of matter and second area；
At least one layer of circularly polarized light selective transmission layer is formed, to form the optical thin film, wherein check device is with not Tongfang
In the case of irradiation optical thin film, different-effect is presented in optical thin film in visible-range.
20. method for production of optical film according to claim 19, which is characterized in that
The circularly polarized light selective transmission layer is one kind in cholesteric crystal layer or circularly polarizing plate；
And/or
One kind in the film that the optical retarder is nematic liquid crystal layer or optical delay is quarter-wave plate；
And/or
The optical thin film is the optical thin film as described in any one of claim 5-13.
21. the method for production of optical film according to claim 19 or 20, which is characterized in that further include：
Form at least one layer of dark-background layer contacted with circularly polarized light selective transmission layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810180829.2A CN108507951A (en) | 2018-03-06 | 2018-03-06 | Safe articles and its false distinguishing method and system, optical thin film and its manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810180829.2A CN108507951A (en) | 2018-03-06 | 2018-03-06 | Safe articles and its false distinguishing method and system, optical thin film and its manufacturing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108507951A true CN108507951A (en) | 2018-09-07 |
Family
ID=63377187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810180829.2A Pending CN108507951A (en) | 2018-03-06 | 2018-03-06 | Safe articles and its false distinguishing method and system, optical thin film and its manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108507951A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107132607A (en) * | 2017-06-09 | 2017-09-05 | 先尼科化工（上海）有限公司 | Optical anti-counterfeiting film apparatus |
-
2018
- 2018-03-06 CN CN201810180829.2A patent/CN108507951A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107132607A (en) * | 2017-06-09 | 2017-09-05 | 先尼科化工（上海）有限公司 | Optical anti-counterfeiting film apparatus |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2016201176B2 (en) | Forgery-proof medium and verification method | |
| US6124970A (en) | Polymer materials with latent images visible in polarized light and methods for their production | |
| JP4959304B2 (en) | Identification medium, identification method, and identification apparatus | |
| RU2102246C1 (en) | Means of identification or valuable document, method of its manufacture and check-up of its authenticity | |
| JP4257903B2 (en) | Identification medium, identification medium identification method, identification target article, and identification apparatus | |
| CN103676261B (en) | Optically variable anti-counterfeiting element and preparation method thereof, anti-fake product | |
| WO2011017749A1 (en) | Polarising liquid crystal device | |
| KR102543844B1 (en) | A Film for Preventing Forgery and Falsification and Method of Using there of | |
| JP2008070807A (en) | Medium and label for preventing forgery, printed matter, transferring foil and discrimination method | |
| KR20210138974A (en) | Means Preventing Forgery and Falsification Comprising Cholesteric Liquid Crystal Layer | |
| JP2001506191A (en) | Secret mark and authenticity marking system | |
| JP2005022292A (en) | Identifying structure of object and object provided therewith | |
| JP2001256531A (en) | Security product, article with security information, forgery discrimination method, and method for manufacturing security product | |
| CN105980893B (en) | The manufacturing method of alignment films and the manufacturing method of display body | |
| CN108507951A (en) | Safe articles and its false distinguishing method and system, optical thin film and its manufacturing method | |
| JP2008080501A (en) | Antifalsifying medium, antifalsifying label, printed material, transfer foil and judging method | |
| KR20210138967A (en) | Flexible Packaging Comprising Cholesteric Liquid Crystal Layer | |
| US9789724B2 (en) | Optical security device and system and fabrication methods thereof | |
| KR102528188B1 (en) | Forgery Prevention Means Including a Cholesteric Liquid Crystal Display Layer and an Interference Light Forming Layer | |
| WO2022168690A1 (en) | Optical layered product, method for determining authenticity thereof, and article | |
| CN111602179B (en) | Method for manufacturing a personalized optical document security element and element obtained | |
| WO2004062938A2 (en) | Improvements in or relating to security or authentication markings and the like | |
| CN117192829A (en) | Anti-counterfeit device comprising cholesteric liquid crystal display layer and scattering layer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180907 |