CN104614790B - Planar Fresnel lens arra dynamically amplifies blooming - Google Patents
Planar Fresnel lens arra dynamically amplifies blooming Download PDFInfo
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
- G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B25/00—Eyepieces; Magnifying glasses
- G02B25/002—Magnifying glasses
- G02B25/008—Magnifying glasses comprising two or more lenses
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Abstract
The invention discloses a kind of planar Fresnel lens arra and dynamically amplify blooming, described blooming includes substrate layer, is positioned at the some fresnel lens array layers above substrate layer and is positioned at the some micrographics layers below substrate layer, the Fresnel Lenses that wherein said fresnel lens array layer is arranged by some arrays forms, the focal length that distance is Fresnel Lenses of described fresnel lens array layer and micrographics layer。The present invention dynamically amplifies blooming by the imaging effect of Fresnel Lenses so that the pattern visual evoked potentials in micrographics layer reproduces, and the intensified image reproduced has the effect of dynamic solid。
Description
Technical field
The present invention relates to optical anti-counterfeiting and dynamic security technical field of membrane, particularly relate to a kind of planar Fresnel lens arra and dynamically amplify blooming, can be applicable to banknote, card, security, secure file etc. and there is the optical anti-counterfeiting of brand product of high added value。
Background technology
Techniques of Optical Security has significant visual identity, and is prone to be identified by the public, is widely used in brand product, important safety file, card security etc. and relates to the field such as economic interests and public safety。Laser Holographic Counterfeit-proof Technique was once that the internationally recognized anti-counterfeiting technology with development prospect serves important anti-fake effect really, but universal along with technology, a lot of producers all have the ability producing and using this technology so that its antiforge function reduces。
The another kind of Techniques of Optical Security amplified based on More enters the visual field of researcher and the public, microlens array and micrographics array are combined by More's amplifying technique, according to different arrangement modes, the stereoeffects such as micrographics amplification, mobile, floating and sinking can be produced。US Patent No. 5612731 utilizes dimpling lens arra to be combined acquisition strip safety element with micrographics array。The bore of the microlens array used is at 50-250 μm, and focal length is generally 200 μm, and this design configurations is unfavorable for making ultrathin optics dynamic anti-fake film。For the high-end anti-fake product such as banknote, security, it is desirable to the thickness as the dynamic anti-fake film of opened window safety line is little as far as possible, generally, the thickness of safety diaphragm is less than 50 μm。U.S. Patent application 2008/0037131Al has expanded More and has amplified false proof range of application, for making the ultra-thin dynamic anti-fake film (thickness is less than 50 μm) of applicable card and banknote application, microlens array bore is contracted to 20-30 μm, and focal length is less than 50 μm。And micrographics array layer and micro-lens arrays layer can have arrangement mode complicated and changeable, it is achieved more rich dynamic display of functional。In optical amplifier and display effect, Chinese patent CN201010180251.4 discloses the dimpling lens arra of random distribution, combines and this array micrographics array one to one, it is achieved only one of which amplification figure in the two overlapping region。Lenticule caliber size is 25 to 100 μm, and space layer is smaller than 30 μm。
The dynamic security film that document above proposes is all based on refractive microlens array, and refractive microlens array is combined the certain amplification of generation and the optical effect such as dynamic with micrographics。But microlens array has rise, the effect of optical amplifier can be changed at microlens array printed thereon。Therefore, this structure not easily with printing technology directly in conjunction with, it is difficult to provide more color scheme to realize more being imbued with the figure of visible change。
For traditional safety diaphragm utilizing refractive lenses array, it is desirable to microlens array structure exists the border that refractive index is different, for instance the interface of air and lens arra。When microlens array exposes in atmosphere, it does not have when protective layer, easily cause the damage of safety diaphragm so that it is service life shortens。
Chinese patent application 200510086954.X discloses the microlens array of Fresnel flap-type and makes flat magnifier for microfilm of characters, but have to the microfilm of characters of corresponding array or pattern with the use of。
Chinese patent application 200810186575.1 discloses a kind of planar diffraction type fresnel lens array and reproduces the enlarged drawing picture of miniature pattern array。But its Fresnel chip arrays adopts printing, ink-jet, the mode such as partially metallised to make, and is limited by technique, and zone plate edge is difficult to accomplish micron dimension, more impossible nanometer scale of accomplishing, then, the Fresnel chip arrays of short focus is difficult to。Adopt printing, ink-jet, the mode such as partially metallised is very difficult that Fresnel Lenses bore is accomplished less than 100 microns。
Existing dynamic optical amplifies the upper surface microlens array bore of film from 25 μm to 200 μm, and in order to obtain short focus, lenticular numerical aperture is relatively big, and microlens array has certain rise。The rise of microlens array makes to directly print ink on microlens array surface, and otherwise, at printing zone, rise part is filled and led up by ink, and so, the amplification effect of dynamic optical film will disappear。Meanwhile, being limited by technique restriction, short focus microlens array makes extremely difficult, for instance the microlens array of 25 μm of bores, and focal length the shortest in theory is 25 μm, and reality can accomplish 28 μm technique。Considering micrographics layer and wall, the thickness of dynamic optical amplification thin film is minimum can reach about 35 μm, unless lenticule bore reduces, otherwise dynamic optical amplifies the very difficult reduction further of thickness of thin film。
For obtaining ultrathin Planar integration imaging dynamic security film, it is necessary for finding the new method reducing lenticule focal length。Also to consider to directly print ink image on the surface of microlens array, to improve the display effect dynamically amplifying optical thin film simultaneously。And making surface texture not by the impact of printing-ink, this is the key issue that the present invention needs to solve。
Therefore, for above-mentioned technical problem, it is necessary to provide a kind of planar Fresnel lens arra dynamically to amplify blooming。
Summary of the invention
In view of this, in order to solve described the problems of the prior art, the invention provides a kind of planar Fresnel lens arra and dynamically amplify blooming, there is substrate layer, fresnel lens array layer and micrographics layer, micrographics layer is positioned near the focal plane of fresnel lens array layer, by the imaging effect of Fresnel Lenses so that the pattern visual evoked potentials in micrographics layer reproduces, and the intensified image reproduced has the effect of dynamic solid。
To achieve these goals, the technical scheme that the embodiment of the present invention provides is as follows:
A kind of planar Fresnel lens arra dynamically amplifies blooming, described blooming includes substrate layer, is positioned at the some fresnel lens array layers above substrate layer and is positioned at the some micrographics layers below substrate layer, the Fresnel Lenses that wherein said fresnel lens array layer is arranged by some arrays forms, the focal length that distance is Fresnel Lenses of described fresnel lens array layer and micrographics layer。
As a further improvement on the present invention, described Fresnel Lenses includes the first fourier transform lens, Fresnel phase part, the second fourier transform lens, output face and the miniature optical system that set gradually along optical axis, by the first fourier transform lens, Fresnel phase part and the second fourier transform lens, output face is formed the optical field distribution of the Fresnel Lenses of different focal, through follow-up miniature optical system, it is thus achieved that fresnel lens array。
As a further improvement on the present invention, described planar Fresnel lens arra dynamically amplifies the thickness of blooming more than or equal to 20 μm, and the thickness of array of fresnel lenses layer is 200nm-1 μm。
As a further improvement on the present invention, the thickness of described substrate layer is 10 μm-500 μm。
As a further improvement on the present invention, in described micrographics layer, the characteristic size of micrographics is more than or equal to 1 μm, and the gash depth of micrographics is 1 μm-5 μm。
As a further improvement on the present invention, in described micrographics layer, the characteristic size of micrographics is 2 μm-5 μm。
As a further improvement on the present invention, in described fresnel lens array layer, the null tone of the edge of Fresnel phase part range for 50 lines right/mm-10 line is right/mm, the numerical aperture of objective NA > 0.45 of miniature optical system, miniature multiple > 20 times, visual field is 2mm。
As a further improvement on the present invention, the outside evaporation of described fresnel lens array layer has high refractive index medium layer, and the refractive index of described high refractive index medium layer is more than or equal to 2.0。
As a further improvement on the present invention, the ink of the zones of different coating different colours of described fresnel lens array layer, in the zones of different of fresnel lens array layer, the focal length of Fresnel Lenses is different。
As a further improvement on the present invention, described substrate layer includes the first substrate layer and the second substrate layer that set gradually from the top down, described fresnel lens array layer includes the first fresnel lens array layer and the second fresnel lens array layer that are positioned on the first substrate layer, and described micrographics layer includes being positioned at the first micrographics layer below the first substrate layer and is positioned at the second micrographics layer below the second substrate layer。
As a further improvement on the present invention, in described first fresnel lens array layer, the focal length of Fresnel Lenses is the first fresnel lens array layer and the distance of the first micrographics layer, and in the second fresnel lens array layer, the focal length of Fresnel Lenses is the second fresnel lens array layer and the distance of the second micrographics layer。
The method have the advantages that
Fresnel lens array has more short focus, is advantageously implemented thinner dynamic optical and amplifies film, and the present invention more than in 0.45 doubly telecentric interference between projections optical system, can realize the fresnel lens array of short focus in numerical aperture；
Fresnel Lenses belongs to planar technology, fresnel lens array layer is deposited with high refractive index medium layer again, different from the microlens array with rise, the dynamic optical of employing fresnel lens array amplifies film, can at array layer upper surface print color figure, color as transparent in printing-ink, image amplification effect is not substantially affected by the impact of printing；
The fresnel lens array of zones of different can have different focal to be distributed, it may be achieved amplification difference or more dynamic image amplification effect；
On the micrographics layer dynamically amplifying blooming, micrographics color is different from the color of surface printing, can form the motion graphics effect of color combination two kinds different；
The Fill Color of micrographics layer is pure color, and the dispersion of such fresnel lens array layer can reduce, and can not affect the amplification effect that image shows, improving image definition。
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, the accompanying drawing that the following describes is only some embodiments recorded in the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings。
Fig. 1 is the structural representation dynamically amplifying blooming in the embodiment of the present invention one；
Fig. 2 is the preparation principle figure of Fresnel Lenses in the embodiment of the present invention one；
Fig. 3 is the schematic diagram of fresnel lens array in the embodiment of the present invention one；
Fig. 4 is the structural representation dynamically amplifying blooming in the embodiment of the present invention two；
Fig. 5 is the structural representation dynamically amplifying blooming in the embodiment of the present invention three；
Fig. 6 is the structural representation dynamically amplifying blooming in the embodiment of the present invention four；
Fig. 7 is the schematic diagram of fresnel lens array in the embodiment of the present invention four；
Fig. 8 is the structural representation dynamically amplifying blooming in another embodiment of the present invention。
Detailed description of the invention
Describe the present invention below with reference to detailed description of the invention shown in the drawings。But these embodiments are not limiting as the present invention, those of ordinary skill in the art is all contained in protection scope of the present invention according to the made structure of these embodiments, method or conversion functionally。
The invention discloses a kind of planar Fresnel lens arra and dynamically amplify blooming, including substrate layer, it is positioned at the some fresnel lens array layers above substrate layer and is positioned at the some micrographics layers below substrate layer, the Fresnel Lenses that wherein fresnel lens array layer is arranged by some arrays forms, the focal length that distance is Fresnel Lenses of fresnel lens array layer and micrographics layer, namely micrographics layer is positioned near the focal plane of fresnel lens array layer。By the imaging effect of nanometer Fresnel Lenses so that the pattern visual evoked potentials in micrographics layer reproduces, and the intensified image reproduced has the effect of dynamic solid。
The present invention adopts interference photoetching method to realize nanometer fresnel lens array。Make by continuous emptying frequency photoetching technique and nano impression, lithographic equipment that this continuous emptying frequency photoetching technique is recorded with reference to Chinese patent application that application number is CN201310166341.1 and photoetching method。In the interference lithography system of continuous emptying frequency, use Fresnel phase part, miniature by projection optical system, in the object lens output face that doubly telecentric projects miniature optical system, form the light field of Fresnel Lenses distribution。Change the position of Fresnel phase part, the Fresnel Lenses focal length after adjustable photoetching, repeatedly repeated exposure along optical axis direction, form fresnel lens array。
Usually, adopting the object lens of numerical aperture NA=0.45,20 times project miniature optical system, and during incident wavelength 351nm, the edge period of the Fresnel Lenses formed on a photoresist is up to 400nm。If with the edge of Fresnel Lenses for 600nm computation of Period (corresponding null tone 1600 line right/mm), when centre wavelength be 550nm visible ray parallel incident time, the edge of Fresnel Lenses angle of diffraction in medium is 38 degree (maximum 42 degree)。If Fresnel Lenses diameter is 25 μm, then Fresnel Lenses focal length is up to 16 μm；If Fresnel Lenses diameter is 50 μm, then, corresponding focal length is 32 μm。
In such scheme, the focusing effect of nanometer fresnel lens array is caused by diffraction effect, unavoidably there is effect of dispersion。At a nanometer fresnel lens array upper surface evaporation high refractive index layer, republish different pigment, after it filters so that the white light of irradiation reflection wavelength bandwidth after pigments absorbalight diminishes, the Fresnel Lenses dispersion impact on amplifying figure can be reduced。As in surface printing red pigment, then incident illumination centre wavelength is 600-650nm, now, Fresnel Lenses focal length is 14-16 μm, and such as printing blue pigment, incident illumination centre wavelength is 450-500nm, and corresponding Fresnel Lenses focal length is at about 22-20 μm。
In such scheme, in micrographics layer, the Fill Color of groove is generally pure color, such as blue or red ink, then the effect of dispersion of fresnel lens array can reduce, and does not affect the amplification effect of image。
In technique scheme, by the translation phase part in optical system interference lithography, it may be achieved variable nanometer of fresnel lens array of focal length, it is under wavelength 550nm, 16 μm～5mm of focal-distance tuning range。Technique scheme is for fresnel lens array that bore is 25 μm, its focal length under wavelength 550nm 16 μm, the thickness dynamically amplifying blooming reaches 25 μm, simultaneously, can at the surface printing pigment of dynamic optical thin film, figure, to promote the display effect dynamically amplifying optical thin film。
Can having extra play at a nanometer fresnel lens array outer layer, extra play can be high refractive index medium layer, can be printed with ink, fluorescence, magnetic, phosphorus, select absorbed layer or have micro-nano structure layer on high refracting layer；Extra play is transparent, and can be protective layer。
The thickness of film substrate layer is at 10 μm to 500 μm, it is preferred that substrate layer thickness is at 15-100 μm。Substrate layer material can be PC, PVC, PET, PMMA, ultraviolet sensitivity glue etc., it is preferred to PET film。
Substrate layer can be single PC, PVC, PET film etc., it is also possible to is the multilayer film through being compounded to form。
Nanometer fresnel lens array layer and micrographics layer material can be ultra-violet curing glue or for thermo-sensitive material。
Micrographics layer can pass through UV nano impression or hot-press method makes。Impression block used can be made up of nickel, nickel cobalt (alloy) etc.。The impressing mode adopted can be that volume to volume, volume are to putting down, putting down equality。
Can having extra play between above-mentioned substrate layer and micrographics layer, extra play can be high refractive index medium layer, or be coated with ink, fluorescence, magnetic, phosphorus, select absorb or have micro-nano structure；Extra play is transparent, and can be protective layer。
In such scheme, by the corresponding region in different color-printed, the Focussing of the fresnel lens array of preparation will be needed in advance。The focal length of the Fresnel Lenses of red pigment printing zone improves, and the Fresnel array focal length of blue pigment printing zone reduces, it is ensured that the concordance dynamically amplifying image focal length in different diffraction region。
Below in conjunction with specific embodiment, the invention will be further described。
Embodiment one:
Ginseng Fig. 1 show the embodiment of the present invention one midplane fresnel lens array and dynamically amplifies the structural representation of blooming, the upper and lower surface of substrate layer 1 is laid respectively at including substrate layer 1, fresnel lens array layer 2 and micrographics layer 3, fresnel lens array layer 2 and micrographics layer 3。
The lithographic equipment recorded with reference to the Chinese patent application that application number is CN201310166341.1 and photoetching method, as shown in Figure 2, it is standby that fresnel lens array layer can pass through above-mentioned interference optical graving, the Fresnel Lenses that fresnel lens array layer is arranged by some arrays forms, and Fresnel Lenses includes the first fourier transform lens 21, Fresnel phase part the 22, second fourier transform lens 23, output face 24 and the miniature optical system (not shown) that set gradually along optical axis 25。
Adopting Fourier transformation light path, place Fresnel phase part 22 after the first fourier transform lens 21, Fresnel phase part 22 groove depth uses wavelength equal to photoetching, only has positive and negative first-order diffraction light, eliminates zero order light。By translating Fresnel phase part 22 along optical axis 25, output face 24 defines the optical field distribution of the Fresnel Lenses of different focal, the miniature optical interference circuit in follow-up miniature optical system, a nanometer fresnel lens array can be obtained。
In the present embodiment, the parameter of Fresnel phase part 22 is as follows: the null tone of the edge of Fresnel phase part range for 50 lines right/mm-10 line is right/mm。The numerical aperture of objective NA > 0.45 of miniature optical system, miniature multiple > 20 times, visual field～2mm, lithographic wavelength is ultraviolet 351nm, the maximum null tone of output face be 2500 lines right/mm, the corresponding cycle is minimum for 400nm, the focal length 16 μm of corresponding fresnel lens array and more than。The constructional depth of nanometer array of fresnel lenses is generally 200nm-1 μm, and nanometer fresnel lens array dynamically amplifies the thickness of blooming can reach 20 μm or more than 20 μm。
In Fig. 1, the structure of Fresnel lens array layer 2 is as shown in Figure 3。The arrangement mode of fresnel lens array can be the orthogonal arrangement shown in Fig. 3, it can also be cellular or other arrangement form, for by light-ray condensing in micrographics layer 3, the arrangement mode of fresnel lens array layer 2 and corresponding micrographics layer 3 can amplify as requested and display effect set。
Substrate layer 1 thickness is at 10 μm-500 μm, it is preferred that substrate layer thickness is at 15-100 μm。Substrate layer material can be PC, PVC, PET, PMMA, ultraviolet sensitivity glue etc., it is preferred to PET。
The micrographics characteristic size of micrographics layer 3 is general > 1 micron, it is preferable that 2-5 micron, general 1 μm-5 μm of the gash depth of micrographics。
Embodiment two:
Ginseng Fig. 4 show the embodiment of the present invention two midplane fresnel lens array and dynamically amplifies the structural representation of blooming, compared with embodiment one, the present embodiment there is high refractive index medium layer 4 at the outside of fresnel lens array layer 2 evaporation, other are all identical with embodiment one, no longer repeat at this。Can directly printing various figure in the present embodiment on high refractive index medium layer 4, high refractive index medium layer 4 is alternatively arranged as the protective layer of fresnel lens array layer simultaneously。
Nanometer Fresnel Lenses belongs to planar technology, is deposited with high refractive index medium on fresnel lens array layer again, and such as ZnS medium, its refractive index is about 2.0。According to grating equation, if incident wavelength is 550nm, vertical incidence, then nanometer Fresnel Lenses edge period is less than 600nm。Now, the focal length of corresponding fresnel lens array is less than 20 μm。Different from the microlens array with rise, fresnel lens array is utilized to amplify film as the dynamic optical of image-forming component, directly can printing various pattern on high refractive index medium layer 4, if printing ink colors is transparent, the dynamic amplification effect of image is not substantially affected by the impact of dimensional printed chart picture。
Embodiment three:
Zones of different at fresnel lens array layer 2 is coated with the ink of different colours, can combine with the color filling ink in micrographics layer 3。In the upper and lower surface of integration imaging blooming, micrographics color is different from the color of surface printing, can form the motion graphics effect of color combination two kinds different。
Shown in ginseng Fig. 5, in the present embodiment, Fresnel lens array layer 2 is divided into first area 201 and second area 202, first area 201 and the different ink of printing on second area 202, as at first area 201 brush blue-tinted transparent ink, printed red, transparent ink at second area 202。Fresnel Lenses itself has effect of dispersion, and when the light of different wave length is assembled, corresponding focal length is different。So can be different according to the color at fresnel lens array layer 2 zones of different printing-ink, adopt the focal length of required Fresnel Lenses。The ink of first area 201 printing is blue, and compared to the red ink of second area 202 printing, the focal length of nanometer Fresnel Lenses that this region is corresponding needs to reduce。Now, it is ensured that first area on fresnel lens array layer 2 and second area simultaneously light collection on micrographics layer 3。
Micrographics layer 3 can be filled shades of colour ink, when micrographics layer 3 is filled blue ink, the red combination with first area 201, the color from redness to purple can be formed and change。When filling green ink in micrographics layer 3, the blueness in first area 201 and green mixed display cyan, in second area 202, red and green combination then can show yellow。
Fresnel lens array layer 2 can print different colours in zones of different, and be distributed at the focal length of zones of different by adjustment Fresnel Lenses simultaneously, combines with Fill Color in micrographics layer 3, forms abundant color display effect。
Embodiment four:
Ginseng Fig. 6 show the planar Fresnel lens arra of multi-layer stereoscopic effect in the embodiment of the present invention four and dynamically amplifies the structural representation of blooming, including substrate layer, fresnel lens array layer, and micrographics layer, substrate layer includes the first substrate layer 11 and the second substrate layer 12 set gradually from the top down, fresnel lens array layer includes the first fresnel lens array layer 221 and the second fresnel lens array layer 222 being positioned on the first substrate layer 11, micrographics layer includes being positioned at the first micrographics layer 31 below the first substrate layer 11 and is positioned at the second micrographics layer 32 below the second substrate layer 12。First fresnel lens array layer 221 and the second fresnel lens array layer 222 are corresponding to different regions。Being illustrated in figure 7 the structural representation of fresnel lens array layer, in fresnel lens array layer, in zones of different, the focal length of fresnel lens array is different, respectively from different micrographics layers with the use of。
First fresnel lens array layer 221 focal length is shorter, is used for light collection in the first micrographics layer 31, and the second fresnel lens array layer 222 focal length is longer, is used for light collection in the second micrographics layer 32。Owing to the first micrographics layer 31 is on the focal plane of long-focus the first fresnel lens array layer 221, and the second micrographics layer 32 is not at the focal zone of the first fresnel lens array layer 221, so the first micrographics layer 31 coordinates with the first fresnel lens array layer 221 and could produce intensified image clearly, combine with the second fresnel lens array layer 222, it is impossible to produce More's amplification。In like manner, the second micrographics layer 32 only could form the dynamic intensified image of micrographics with the second fresnel lens array layer 222 combination。First fresnel lens array layer 221 and the second fresnel lens array layer 222 have different focal lengths, different cycles, different arrangement modes。The cycle of the first micrographics layer 31 and the second micrographics layer 32 and arrangement mode are corresponding with the first fresnel lens array layer 221 and the second fresnel lens array layer 222 respectively。
First micrographics layer 31 and the second micrographics layer 32 and the first fresnel lens array layer 221 and the second fresnel lens array layer 222 are respectively provided with different arrangement modes, different print colors etc., so both take different compound modes in image enlargement ratio, color of image, floating, sinking and moving direction etc., and what can be observed to have abundant effect under different visual angles dynamically amplifies figure。
Further; the various embodiments described above can be respectively provided with microlens array protective layer 21 ', extra play 22 ' and 23 ' and micro-nano structure protective layer 24 ', adhesive linkage 25 ' outside fresnel lens array layer 2, between substrate layer 1 and fresnel lens array layer 2, between substrate layer 1 and micrographics layer 3 and outside micrographics layer 3, as shown in Figure 8。Extra play 22 ', 23 ' and microlens array protective layer 21 ', micro-nano structure protective layer 24 ' can be dielectric layer, metal level, or are coated with ink, fluorescence, magnetic, phosphorus, select absorb or have micro-nano structure；In the various embodiments described above, micrographics can be various forms of word, image or character image combination；The change of the Fresnel focal length of lens, the change of coating printing ink color and change with micrographics arrangement form and color in the various embodiments described above, can independent assortment, it is achieved have the ultrathin planar Fresnel safe blooming of lens arra integration imaging of abundant dynamic effect。
As can be seen from the above technical solutions, the method have the advantages that
Fresnel lens array has more short focus, is advantageously implemented thinner dynamic optical and amplifies film, and the present invention more than in 0.45 doubly telecentric interference between projections optical system, can realize the fresnel lens array of short focus in numerical aperture；
Fresnel Lenses belongs to planar technology, fresnel lens array layer is deposited with high refractive index medium layer again, different from the microlens array with rise, the dynamic optical adopting fresnel lens array amplifies film, can at array layer upper surface print color figure, color as transparent in printing-ink, image amplification effect is not substantially affected by the impact of printing；
The fresnel lens array of zones of different can have different focal to be distributed, it may be achieved amplification difference or more dynamic image amplification effect；
On the micrographics layer dynamically amplifying blooming, micrographics color is different from the color of surface printing, can form the motion graphics effect of color combination two kinds different；
The Fill Color of micrographics layer is pure color, and the dispersion of fresnel lens array layer can reduce, and can not affect the amplification effect that image shows, improving image definition。
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, and when without departing substantially from the spirit of the present invention or basic feature, it is possible to realize the present invention in other specific forms。Therefore, no matter from which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the invention rather than described above limits, it is intended that all changes in the implication of the equivalency dropping on claim and scope included in the present invention。Any accompanying drawing labelling in claim should be considered as the claim that restriction is involved。
In addition, it is to be understood that, although this specification is been described by according to embodiment, but not each embodiment only comprises an independent technical scheme, this narrating mode of description is only for clarity sake, description should be made as a whole by those skilled in the art, and the technical scheme in each embodiment through appropriately combined, can also form other embodiments that it will be appreciated by those skilled in the art that。
Claims (11)
1. a planar Fresnel lens arra dynamically amplifies blooming, it is characterized in that, described blooming includes substrate layer, is positioned at the some fresnel lens array layers above substrate layer and is positioned at the some micrographics layers below substrate layer, the Fresnel Lenses that wherein said fresnel lens array layer is arranged by some arrays forms, the focal length that distance is Fresnel Lenses of described fresnel lens array layer and micrographics layer。
2. planar Fresnel lens arra according to claim 1 dynamically amplifies blooming, it is characterized in that, described Fresnel Lenses includes the first fourier transform lens, Fresnel phase part, the second fourier transform lens, output face and the miniature optical system that set gradually along optical axis, by the first fourier transform lens, Fresnel phase part and the second fourier transform lens, output face is formed the optical field distribution of the Fresnel Lenses of different focal, through follow-up miniature optical system, it is thus achieved that fresnel lens array。
3. planar Fresnel lens arra according to claim 1 dynamically amplifies blooming, it is characterised in that described planar Fresnel lens arra dynamically amplifies the thickness of blooming more than or equal to 20 μm, and the thickness of array of fresnel lenses layer is 200nm-1 μm。
4. planar Fresnel lens arra according to claim 1 dynamically amplifies blooming, it is characterised in that the thickness of described substrate layer is 10 μm-500 μm。
5. planar Fresnel lens arra according to claim 1 dynamically amplifies blooming, it is characterised in that in described micrographics layer, the characteristic size of micrographics is more than or equal to 1 μm, and the gash depth of micrographics is 1 μm-5 μm。
6. planar Fresnel lens arra according to claim 5 dynamically amplifies blooming, it is characterised in that in described micrographics layer, the characteristic size of micrographics is 2 μm-5 μm。
7. planar Fresnel lens arra according to claim 2 dynamically amplifies blooming, it is characterized in that, in described fresnel lens array layer, the null tone of the edge of Fresnel phase part range for 50 lines right/mm-10 line is right/mm, the numerical aperture of objective NA > 0.45 of miniature optical system, miniature multiple > 20 times, visual field is 2mm。
8. planar Fresnel lens arra according to claim 1 dynamically amplifies blooming, it is characterised in that the outside evaporation of described fresnel lens array layer has high refractive index medium layer, and the refractive index of described high refractive index medium layer is more than or equal to 2.0。
9. planar Fresnel lens arra according to claim 1 dynamically amplifies blooming, it is characterized in that, the ink of the zones of different coating different colours of described fresnel lens array layer, in the zones of different of fresnel lens array layer, the focal length of Fresnel Lenses is different。
10. planar Fresnel lens arra according to claim 1 dynamically amplifies blooming, it is characterized in that, described substrate layer includes the first substrate layer and the second substrate layer that set gradually from the top down, described fresnel lens array layer includes the first fresnel lens array layer and the second fresnel lens array layer that are positioned on the first substrate layer, and described micrographics layer includes being positioned at the first micrographics layer below the first substrate layer and is positioned at the second micrographics layer below the second substrate layer。
11. planar Fresnel lens arra according to claim 10 dynamically amplifies blooming, it is characterized in that, in described first fresnel lens array layer, the focal length of Fresnel Lenses is the first fresnel lens array layer and the distance of the first micrographics layer, and in the second fresnel lens array layer, the focal length of Fresnel Lenses is the second fresnel lens array layer and the distance of the second micrographics layer。
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| CN201510094589.0A CN104614790B (en) | 2015-03-03 | 2015-03-03 | Planar Fresnel lens arra dynamically amplifies blooming |
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| CN201510094589.0A CN104614790B (en) | 2015-03-03 | 2015-03-03 | Planar Fresnel lens arra dynamically amplifies blooming |
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| CN104965254A (en) * | 2015-07-30 | 2015-10-07 | 上海宏盾防伪材料有限公司 | Dynamic 3D holographic element and manufacturing method therefor |
| CN106271088B (en) * | 2016-08-25 | 2019-02-26 | 南开大学 | A kind of Fresnel zone plate array making method and application based on femtosecond laser |
| CN111619262B (en) * | 2019-02-28 | 2021-05-11 | 中钞特种防伪科技有限公司 | Optical anti-counterfeiting element and anti-counterfeiting product |
| CN109870821A (en) * | 2019-04-03 | 2019-06-11 | 冯煜 | A kind of focusing structure and the method for realizing naked eye 3D display |
| CN110333606A (en) * | 2019-05-06 | 2019-10-15 | 苏州大学 | A kind of optical imaging film based on micro- concentrating element |
| CN110789456A (en) * | 2019-10-23 | 2020-02-14 | 苏州大学 | Ultra-large visual angle automobile rearview mirror film and method for expanding visual angle of rearview mirror |
| CN114428391B (en) * | 2020-10-29 | 2023-06-02 | 中钞特种防伪科技有限公司 | Optical anti-counterfeiting element and anti-counterfeiting product comprising same |
| CN112859214A (en) * | 2021-02-22 | 2021-05-28 | 汪强 | Roller shutter type Fresnel lens array and light guide energy gathering system |
| CN114708787B (en) * | 2022-03-14 | 2023-10-03 | 武汉华工图像技术开发有限公司 | 3D anti-counterfeiting film, manufacturing method of 3D anti-counterfeiting film and 3D anti-counterfeiting label |
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