CN1689844B - Plastic bill sub-wavelength grating guided-mode resonance anti-counterfeiting mark and manufacturing method thereof - Google Patents

Abstract

The utility model provides a mould resonance false proof mark is led to plastic paper money subwavelength grating, by plastic paper money (coin) base plate (1), visual pattern (2), false proof mark region (3), characters, letter or figure (4) in the region and the overburden of moulding paper money (coin) constitute its characterized in that: the anti-counterfeiting area (3) is provided with characters, letters or figures (4) with anti-counterfeiting function which are visible in a specific direction range, and the characters, letters or figures are all composed of pressed sub-wavelength waveguide gratings which are densely distributed in a single direction and have different lengths. Full-bright monochromatic anti-counterfeiting characters, letters or figures can be observed on the front surface of the plastic banknote (coin), because the sub-wavelength waveguide grating generates guided mode resonance to one-wavelength light of incident light, and because the guided mode resonance and the refractive index n of the materials of the plastic banknote (coin) substrate (1) and the covering layer_sAnd n_gGrating period t and grating height h₂The anti-counterfeiting characters, letters or figures are not easy to be imitated and the anti-counterfeiting effect is excellent.

Description

Mould paper money sub-wave length grating guide mode resonance anti-fake mark and preparation method thereof

Technical field

The present invention relates to a kind of paper money (coin) sub-wave length grating guide mode resonance anti-fake mark and preparation method thereof of moulding, belong to field of anti-counterfeit technology.

Background technology

In current commercial economy society, buying and selling of commodities exchange all is to be undertaken by money (coin) usually, a lot of countries comprise that the main now money (coin) that use of China all are bank note, but what the use of a lot of countries and regions was also arranged is than the better plastics money of bank note (coin), for standard currency and financial market, be necessary at bank note and the last making of plastics money (coin) anti-fake mark.Go up the making anti-fake mark at money (coin) at present watermark, metal wire mark, code mark, laser holographic mark or the like are arranged, what have is used for false proof on the bank note, what also have is used for false proof on the plastics money (coin), because the principle of these anti-fake marks is very simple, it is also convenient to make, this is its advantage, also these advantages shortcoming of having brought easy quilt to copy just, the shortcoming that ineffective security is arranged, the query paper money (coin) of similar or close mark occurs having, had a strong impact on and destroyed the orderly development in currency and financial market.

Summary of the invention

Technology of the present invention is dealt with problems and is: overcome above-mentioned the deficiencies in the prior art, a kind of paper money (coin) sub-wave length grating guide mode resonance anti-fake mark and preparation method thereof of moulding is provided, and this method adopts complicated design concept, but production technology is simple relatively, difficult quilt is copied, and antifalse effect is fabulous.

Technical solution of the present invention is: a kind of paper money (coin) sub-wave length grating guide mode resonance anti-fake mark of moulding, by moulding paper money (coin) substrate, the various visual patterns of seeing, the anti-fake mark zone, has anti-fraud functional word in the zone, letter or figure, and overlayer is formed, its characteristics are: have in the false proof zone in the specific direction scope visual see have an anti-fraud functional monochromatic word, letter or figure all are made up of to some sub-wave length gratings different in size the folk prescription of compacting, grating and substrate are same plastic material layer, under the TE polarizing light irradiation, grating region has produced guide mode resonance, sends the observable monochromatic light of high brightness.

The described sub-wave length grating of on moulding paper money (coin) substrate, suppressing in the anti-fake mark zone, its cycle is t, the t value is 0.25-0.75 μ m, at the upper surface in substrate (transparency is 20%-80%) and the antiforge function zone plastic sheeting overlayer of gland one deck partially transparent also, transparency is 20%-80%.And the material refractive index n of substrate _s, grating layer equivalent refractive index n _e, the overlayer refractive index n _g, incident angle θ, grating height h ₂, optical wavelength λ, substrate underlayer thickness h ₃With overlayer height h ₁Have following relation:

${\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="H04109039620040429E000011.png,H04109039620040429E000021.png"\; state="\{\{state\}\}">h</figure-callout>}}_1=\mathrm{\&lambda;}/\left(2\sqrt{n_g^2-{\sin }^2\mathrm{\&theta;}}\right)$

${\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="H04109039620040429E000011.png"\; state="\{\{state\}\}">h</figure-callout>}}_2=\mathrm{\&lambda;}/\left(2\sqrt{n_e^2-{\mathrm{<figure-callout\; id="2"\; label="sin"\; filenames="H04109039620040429E000011.png"\; state="\{\{state\}\}">sin</figure-callout>}}^2\mathrm{\&theta;}}\right)$

${\mathrm{<figure-callout\; id="3"\; label="h"\; filenames="H04109039620040429E000011.png"\; state="\{\{state\}\}">h</figure-callout>}}_3=\mathrm{\&lambda;}/\left(2\sqrt{n_s^2-{\mathrm{<figure-callout\; id="2"\; label="sin"\; filenames="H04109039620040429E000011.png"\; state="\{\{state\}\}">sin</figure-callout>}}^2\mathrm{\&theta;}}\right)$

The material refractive index n of substrate _sValue is 1.100-2.000, the equivalent refractive index n of grating layer _eValue is 1.100-1.900, overlayer refractive index n _gValue is 1.100-2.000, and incident angle θ value is ± 15 °, and optical wavelength λ value is 0.20-0.75 μ m, grating height h ₂Value is 0.01-0.500 μ m, the underlayer thickness h of substrate ₃Value is 0.02-0.50mm, overlayer height h ₁Value is 0.025-0.50mm.Under the TE rayed,, observe very bright a kind of monochromatic anti-fake mark forwardly ± 15 in ° scope because the sub-wave length grating of anti-fake mark has produced guide mode resonance.

Make above-mentioned method and step of moulding paper money (coin) sub-wave length grating guide mode resonance anti-fake mark, its characteristics also are: to the making of word, letter or the icon of grating belt, the first step is with ultra tiny photoetching and lithographic method and technology, produces the mould measure-alike with design parameter on steel or copper, quartz material; Second step was being produced word, letter or the icon of being made up of grating on the antiforge function zone again with roll extrusion or drawing method and technology on the substrate; The 3rd step on the grating surface of compacting, was determined the overlayer refractive index n by following definite mathematical relation designing and calculating again _gWith overlayer height h ₁Numerical value, heat covers the plastic sheeting overlayer of one deck partially transparent again, produces the paper money coin of moulding of the present invention:

${\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="H04109039620040429E000011.png,H04109039620040429E000021.png"\; state="\{\{state\}\}">h</figure-callout>}}_1=\mathrm{\&lambda;}/\left(2\sqrt{n_g^2-{\sin }^2\mathrm{\&theta;}}\right)$

${\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="H04109039620040429E000011.png"\; state="\{\{state\}\}">h</figure-callout>}}_2=\mathrm{\&lambda;}/\left(2\sqrt{n_e^2-{\mathrm{<figure-callout\; id="2"\; label="sin"\; filenames="H04109039620040429E000011.png"\; state="\{\{state\}\}">sin</figure-callout>}}^2\mathrm{\&theta;}}\right)$

${\mathrm{<figure-callout\; id="3"\; label="h"\; filenames="H04109039620040429E000011.png"\; state="\{\{state\}\}">h</figure-callout>}}_3=\mathrm{\&lambda;}/\left(2\sqrt{n_s^2-{\mathrm{<figure-callout\; id="2"\; label="sin"\; filenames="H04109039620040429E000011.png"\; state="\{\{state\}\}">sin</figure-callout>}}^2\mathrm{\&theta;}}\right)$

In the formula, λ is an optical wavelength, and θ is an incident angle, n _eBe grating layer equivalent refractive index, n _sBe baseplate material refractive index, h ₂Be grating height and h ₃Be the substrate base layer thickness.

The present invention compared with prior art has the following advantages:

When using this to mould paper money (coin) sub-wave length grating guide mode resonance anti-fake mark and preparation method thereof, because its designing technique principle is quite complicated, although production technology is simple relatively, it is also convenient to make, once design and making parameter are determined, just be difficult for being copied, but be a kind of widespread use therefore, and antifalse effect fabulous again mould paper money (coin) anti-fake mark.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is for having the structure enlarged drawing of antiforge function regional area among Fig. 1;

Fig. 3 is the structure enlarged drawing of an embodiment local detail 1 word AA section in Fig. 2 antiforge function zone

Fig. 4 is the structure enlarged drawing of another embodiment local detail 1 word AA section in Fig. 2 antiforge function zone

Embodiment

As shown in Figure 1, the present invention moulds paper money (coin) sub-wave length grating guide mode resonance anti-fake mark, sees that by various visual on paper money (coin) substrate 1, the substrate moulded of partially transparent pattern 2, antiforge function zone 3 and overlayer 6 form.Moulding paper money (coin) substrate 1 is the transparent plastics (film or plate) of a part, and transparency is 20%-80%, and thickness is 0.02-0.5mm; Variously commonly visually see that pattern 2 is to print the images on the film (or plate) with the method for printing, pattern 2 comprises numeral, literal, letter and pattern, and it all is visually to see that any direction and situation have the light time; In anti-fake mark district 3 sizes of moulding on paper money (coin) substrate 1 is 5 * 5-40 * 40mm, and it is shaped as rectangle or square, circular, ellipse and rhombus etc., makes the marks of being made up of sub-wave length grating different such as false proof word, letter or figure 4 in the zone 3; Overlayer 6 is that being compressed on of another kind of partially transparent moulded the plastic foil (or plate) on paper money (coin) substrate 1, transparency is 20%-80%, thickness is 0.02-0.5mm, overlayer 6 also makes to have the visual pattern of seeing with being adjacent to of substrate 1 on the face, corresponding anti-fake mark district does not do, and moulds that all of paper money (coin) are visual sees that pattern, word, letter and anti-fake mark are all between substrate 1 and overlayer 6.

As shown in Figure 2, for having antiforge function regional area 3 structure enlarged drawings among Fig. 1, in this zone, make the marks such as various false proof word, letter or figure formed by sub-wave length grating by different, be that a numeral 100 has been carried out the structure amplification among the figure, numeral 100 is to be made of to the sub-wavelength waveguide optical grating 5 of some dense distribution different in size the folk prescription of suppressing as seen from Figure 2, gratings strips number and length is by the decision of word or dimension of picture, and the gratings strips number equals word or dimension of picture divided by grating cycle t.

As shown in Figure 3, structure enlarged drawing for an embodiment local detail 1 word AA section in Fig. 2 antiforge function zone, on anti-fake mark word, letter or the figure of moulding paper money (coin) substrate 1, suppressed sub-wavelength waveguide optical grating 5, its cycle is t, the t value is 0.25-0.75 μ m, at the upper surface in substrate 1 and the antiforge function zone 3 plastic sheeting overlayer 6 of gland one deck partially transparent also, transparency is 20%-80%.And the material refractive index n of substrate 1 _s, grating layer equivalent refractive index n _e, overlayer 6 refractive index ns _g, incident angle θ, grating height h ₂, optical wavelength λ, substrate 1 underlayer thickness h ₃With overlayer 6 height h ₁Have following relation:

${\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="H04109039620040429E000011.png,H04109039620040429E000021.png"\; state="\{\{state\}\}">h</figure-callout>}}_1=\mathrm{\&lambda;}/\left(2\sqrt{n_g^2-{\sin }^2\mathrm{\&theta;}}\right)$

${\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="H04109039620040429E000011.png"\; state="\{\{state\}\}">h</figure-callout>}}_2=\mathrm{\&lambda;}/\left(2\sqrt{n_e^2-{\mathrm{<figure-callout\; id="2"\; label="sin"\; filenames="H04109039620040429E000011.png"\; state="\{\{state\}\}">sin</figure-callout>}}^2\mathrm{\&theta;}}\right)$

${\mathrm{<figure-callout\; id="3"\; label="h"\; filenames="H04109039620040429E000011.png"\; state="\{\{state\}\}">h</figure-callout>}}_3=\mathrm{\&lambda;}/\left(2\sqrt{n_s^2-{\mathrm{<figure-callout\; id="2"\; label="sin"\; filenames="H04109039620040429E000011.png"\; state="\{\{state\}\}">sin</figure-callout>}}^2\mathrm{\&theta;}}\right)$

The material refractive index n of substrate 1 _sValue is 1.100-2.000, the equivalent refractive index n of grating layer _eValue is 1.100-1.900, overlayer 6 refractive index ns _gValue is 1.100-2.000, and incident angle θ value is ± 15 °, and optical wavelength λ value is 0.20-0.75 μ m, grating height h ₂Value is 0.01-0.500 μ m, the underlayer thickness h of substrate 1 ₃Value is 0.02-0.50mm, overlayer 6 height h ₁Value is 0.025-0.50mm.Moulding paper money (coin) has under the white light of TE polarization direction, can in ° scope of the place ahead ± 15 in antiforge function zone 3, observe very bright red false proof word, this is owing to inject the TE polarized white light, produced guide mode resonance through sub-wave length grating, the red light that one narrow wave band is wherein arranged is through moulding paper money (coin) substrate 1, losslessly all reflect, thereby can see very bright red monochromatic false proof word 100 by overlayer 6.

As shown in Figure 4, structure enlarged drawing for another embodiment local detail 1 word AA section in Fig. 2 antiforge function zone, on anti-fake mark word, letter or the figure of moulding paper money (coin) substrate 1, suppressed equally sub-wavelength waveguide optical grating 5 ', its cycle is t ', t ' is worth the m for 0.26-0.70 μ, and the grating height becomes h simultaneously ₂', the equivalent refractive index of grating layer becomes n _e', optical wavelength becomes λ ', and at the upper surface in substrate 1 and the antiforge function zone 3 equally also plastic sheeting overlayer 6 of gland one deck partially transparent, transparency is 20%-80%, and the underlayer thickness of substrate 1 and overlayer height become h respectively ₃' and h ₁'.At this moment the material refractive index n of substrate 1 _s, grating layer equivalent refractive index n _e', overlayer 6 refractive index ns _g, incident angle θ, grating height h ₂', the underlayer thickness h of optical wavelength λ ', substrate 1 ₃' and overlayer 6 height h ₁' have a following relation:

${{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="H04109039620040429E000011.png,H04109039620040429E000021.png"\; state="\{\{state\}\}">h</figure-callout>}}_1}^{\&prime;}={\mathrm{\&lambda;}}^{\&prime;}/\left(2\sqrt{n_g^2-{\mathrm{<figure-callout\; id="2"\; label="sin"\; filenames="H04109039620040429E000011.png"\; state="\{\{state\}\}">sin</figure-callout>}}^2\mathrm{\&theta;}}\right)$

${{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="H04109039620040429E000011.png"\; state="\{\{state\}\}">h</figure-callout>}}_2}^{\&prime;}={\mathrm{\&lambda;}}^{\&prime;}/\left(2\sqrt{{n^{\&prime;}}_e^2-{\sin }^2\mathrm{\&theta;}}\right)$

${{\mathrm{<figure-callout\; id="3"\; label="h"\; filenames="H04109039620040429E000011.png"\; state="\{\{state\}\}">h</figure-callout>}}_3}^{\&prime;}={\mathrm{\&lambda;}}^{\&prime;}/\left(2\sqrt{n_s^2-{\mathrm{<figure-callout\; id="2"\; label="sin"\; filenames="H04109039620040429E000011.png"\; state="\{\{state\}\}">sin</figure-callout>}}^2\mathrm{\&theta;}}\right)$

The material refractive index n of substrate 1 _sValue is 1.100-2.000, the equivalent refractive index n of grating layer _e' be worth and be 1.150-1.850, overlayer 6 refractive index ns _gValue is 1.100-2.000, and incident angle θ value is ± 15 °, and optical wavelength λ ' is worth the m for 0.20-0.70 μ, grating height h ₂' be worth the m for 0.01-0.490 μ, the underlayer thickness h of substrate 1 ₃' be worth and be 0.021-0.50mm, overlayer 6 height h ₁' be worth and be 0.026-0.49mm.Moulding paper money (coin) has under the white light of TE polarization direction, can in ° scope of the place ahead ± 15 in antiforge function zone 3, observe very bright green false proof word, this is owing to inject the TE polarized white light, produced guide mode resonance through sub-wave length grating, the green light that one narrow wave band is wherein arranged is through moulding paper money (coin) substrate 1, losslessly all reflect, thereby also can see very bright green monochromatic false proof word 100 by overlayer 6.

Changing above-mentioned grating cycle t, grating layer equivalent refractive index n _e, grating height h ₂, substrate base layer thickness h ₃With overlayer 6 height h ₁Deng after, perhaps also change the baseplate material refractive index n _sWith the overlayer refractive index n _g, as long as relation below same maintenance the between them:

${\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="H04109039620040429E000011.png,H04109039620040429E000021.png"\; state="\{\{state\}\}">h</figure-callout>}}_1=\mathrm{\&lambda;}/\left(2\sqrt{n_g^2-{\sin }^2\mathrm{\&theta;}}\right)$

${\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="H04109039620040429E000011.png"\; state="\{\{state\}\}">h</figure-callout>}}_2=\mathrm{\&lambda;}/\left(2\sqrt{n_e^2-{\mathrm{<figure-callout\; id="2"\; label="sin"\; filenames="H04109039620040429E000011.png"\; state="\{\{state\}\}">sin</figure-callout>}}^2\mathrm{\&theta;}}\right)$

${\mathrm{<figure-callout\; id="3"\; label="h"\; filenames="H04109039620040429E000011.png"\; state="\{\{state\}\}">h</figure-callout>}}_3=\mathrm{\&lambda;}/\left(2\sqrt{n_s^2-{\mathrm{<figure-callout\; id="2"\; label="sin"\; filenames="H04109039620040429E000011.png"\; state="\{\{state\}\}">sin</figure-callout>}}^2\mathrm{\&theta;}}\right)$

Have under the white light of TE polarization direction, all can in ° scope of the place ahead ± 15 in antiforge function zone 3, observe very bright monochromatic false proof word, letter or figure with the front is the same.

The word of grating belt, letter or icon 4 in the antiforge function zone 3, its method for making and step are: the first step is with ultra tiny photoetching and lithographic method and technology, produces the mould measure-alike with design parameter on steel or copper, quartz material; Second step was being produced word, letter or the icon pattern of being made up of grating on the antiforge function zone 34 again with roll extrusion or drawing method and technology on the substrate 1; The 3rd step is the hot again plastic sheeting overlayer 6 that covers one deck partially transparent on the grating surface of compacting again, produces the paper money (coin) of moulding of the present invention.

Claims (7)

1. mould paper money sub-wave length grating guide mode resonance anti-fake mark for one kind, by moulding the paper money substrate or moulding coin substrate (1), variously visually see that having anti-fraud functional word, letter or figure (4) in pattern (2), anti-fake mark zone (3), the zone forms, it is characterized in that: described false proof zone (3) by the compacting folk prescription to, and sub-wave length grating different in size (5) constitutes, grating and substrate are same plastic material layer, under the TE polarizing light irradiation, grating region has produced guide mode resonance, sends the observable monochromatic light of high brightness.

2. the paper money sub-wave length grating guide mode resonance anti-fake mark of moulding according to claim 1, its feature also is: the pattern of described grating is monochromatic word, letter or figure.

3. the paper money sub-wave length grating guide mode resonance anti-fake mark and preparation method thereof of moulding according to claim 1, its feature also is: the cycle of described compacting grating (5) is 0.25-0.75 μ m.

4. the paper money sub-wave length grating guide mode resonance anti-fake mark of moulding according to claim 1, its feature also is: at the upper surface of substrate (1) and antiforge function zone (3) the plastic sheeting overlayer (6) of gland one deck partially transparent also, its transparency is 20%-80%, and the material refractive index n of substrate (1) _s, grating layer equivalent refractive index n _e, overlayer (6) refractive index n _g, incident angle θ, grating height h ₂, optical wavelength λ, substrate (1) underlayer thickness h ₃With overlayer height h ₁Have following relation:

5. the paper money sub-wave length grating guide mode resonance anti-fake mark of moulding according to claim 1, its feature also is: the material refractive index n of described substrate (1) _sValue is 1.100-2.000, the equivalent refractive index n of grating layer _eValue is 1.100-1.900, overlayer refractive index n _gValue is 1.100-2.000, and incident angle θ value is ± 15 °, and optical wavelength λ value is 0.20-0.75 μ m, grating height h ₂Value is 0.01-0.500 μ m.

6. the paper money sub-wave length grating guide mode resonance anti-fake mark of moulding according to claim 1, its feature also is: the underlayer thickness h of described substrate (1) ₃Value is 0.02-0.50mm, overlayer height h ₁Value is 0.025-0.50mm.

7. make the described method for making of moulding paper money sub-wave length grating guide mode resonance anti-fake mark of claim 1 for one kind, its feature also is: the making of word, letter or the figure (4) of grating belt in antiforge function zone (3), its making step is: the first step is with ultra tiny photoetching and lithographic method and technology, produces the mould measure-alike with design parameter on steel or copper, quartz material; Second step suppressed antiforge function zone (3) and goes up word, letter or the icon of being made up of grating (4) again with roll extrusion or drawing method and technology on substrate (1); The 3rd step on the grating surface of compacting, was determined the overlayer refractive index n by following definite mathematical relation designing and calculating again _gWith overlayer height h ₁Numerical value, heat covers the plastic sheeting overlayer (6) of one deck partially transparent again, produces the paper money coin of moulding of the present invention:

In the formula, λ is an optical wavelength, and θ is an incident angle, n _eBe grating layer equivalent refractive index, n _sBe baseplate material refractive index, h ₂Be grating height and h ₃Be the substrate base layer thickness.

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