CN1552589A

CN1552589A - Continuous microlens array magnification display anti-counterfeiting method

Info

Publication number: CN1552589A
Application number: CNA031235808A
Authority: CN
Inventors: 邓启凌; 杜春雷; 周崇喜
Original assignee: Institute of Optics and Electronics of CAS
Current assignee: Institute of Optics and Electronics of CAS
Priority date: 2003-05-29
Filing date: 2003-05-29
Publication date: 2004-12-08
Anticipated expiration: 2023-05-29
Also published as: CN1552589B

Abstract

The invention discloses an anti-counterfeiting method for enlarging and displaying continuous microlens arrays, and relates to the display technology of micro-optical elements. Using printing, filming, laser printing, micro-processing, micro-engraving methods to produce micro-graphics, using micro-processing methods to produce continuous surface micro-lens arrays that match the caliber and micro-graphics, the two are separated, membrane pressure combined, Combination such as pasting and combination can get a variety of magnified display and three-dimensional effects such as single graphic single color, multi graphic multi color, etc. It also has a strong sense of movement, and it is convenient to observe the micro graphics that cannot be distinguished by the naked eye, so as to achieve the purpose of anti-counterfeiting. The invention has flexible combination mode, unique effect, low cost, wide application range and good market prospect.

Description

Micro lens array amplifies the demonstration method for anti-counterfeit continuously

Technical field

The present invention relates to a kind of continuous micro lens array and amplify the demonstration method for anti-counterfeit, belong to the micro-optic display technique.

Background technology

In recent years, the anti-counterfeiting technology development mainly is based on laser hologram rapidly.But this technology is semi-over, and antiforge function is challenged.Also have such as various methodologies such as code anti-fakes, realization is inconvenient, system is miscellaneous.

People have proposed to adopt to amplify and have shown method for anti-counterfeit for this reason, and the principle of this method for anti-counterfeit is: under the normal illumination condition, the limiting angle of resolution of human eye is 1 '.Under the condition of distance of distinct vision 250mm, the limiting resolution of human eye is 0.072mm.In general for making eyes be unlikely to tired, the visual angle of human eye is about 4 ', promptly can resolution distance is 2 points about 0.3mm.In the ordinary course of things, about 10 * 10 points are formed word, character or a figure.Promptly want pleasant read purposefully or differentiate figure, its area size is greatly about about 4mm * 4mm.Other tiny object must adopt magnifier or microscope that it is amplified, and makes the limiting angle of resolution of the visual angle of intensified image greater than eyes, just can see its microtexture clearly.Promptly must adopt about 15 times magnifier just can see clearly Chu if observe the object of 0.3mm * 0.3mm.If do not help, will be beyond recognition figure and font by means of magnifier or microscope ground.Generally made by optical glass or plastics but amplify the demonstration method for anti-counterfeit, have certain volume and weight, this brings very big inconvenience to observation.

Summary of the invention

Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, provide a kind of convenience, simple micro lens array continuously to amplify and show method for anti-counterfeit, this method has been studied the amplification displaying principle of continuous micro lens array element, design and produce the Micropicture and the micro lens array that match each other, in conjunction with both, the Micropicture that human eye can't be differentiated is amplified demonstration in several ways, and has dynamic effect, and novel, effect is unique, can realize good antiforge function.

Technical solution of the present invention is finished by following steps: micro lens array amplifies the demonstration method for anti-counterfeit continuously, and its characteristics are to comprise the following steps:

(1) designs and produces Micropicture or microstructure;

(2) with the method for microfabrication, make the micro lens array that bore and Micropicture are complementary;

(3) combination Micropicture and micro lens array obtain amplification, demonstration, three-dimensional stereo effect.

The producing method of above-mentioned Micropicture is varied, can adopt the methods such as preceding operation-Fa sheet, laser printing, microfabrication, microscopic carvings quarters of printing, printing.

The method of above-mentioned microfabrication can be utilized mask to move method, gray-tone mask method, photoetching hot fusion method etc. to be shaped on photoetching material.Photoetching material can be photoresist or gelatin.Can select to use dry method, wet etching, do wet method in conjunction with and method accurate transfer figure such as duplicate in required surface.The carrier of final graphics can be a soft material, as rete, organic material surface etc., also can be hard material, as optical glass, optical plastic.The section of micro lens array unit is a convex surface, and horizontal cross sectional geometry is circular, square, polygon (the limit number is more than or equal to 5), and can reduce the micro lens array cost by batch duplicating production.

Combination Micropicture and micro lens array can mainly contain two classes according to the array mode of micro lens array and Micropicture: separate type and combined type.Separate type be that micro lens array and Micropicture can use separately, produce to amplify display effect when both directly paste the added-time.Can freely select in use simultaneously, produce the variation on display graphics color, the size, thereby because the vision stop and the parallax of human eye produce strong innervation and three-dimensional stereo effect in conjunction with angle.This technology is particularly useful for the discriminating of the true and false, and best example is used to differentiate banknote exactly.Can print specific structure in some position of banknote, hold the instrument that micro lens array is arranged above corresponding with it with cash in hand in the staff.This instrument promptly can be rete or be produced on optical glass, the optical plastic.Can design and produce into ornament such as key chain etc., in light weight, be convenient for carrying.When tool using was differentiated, if genuine note will can be observed Micropicture, and with the difference of angle, effect changed, than use magnifier observe attractive in appearance, practical, make things convenient for, strong innervation and three-dimensional stereo effect are arranged.Combined type be on Micropicture with mould, mode integral micro-lens arrays such as glue bond, as: the commodity surface adds the Micropicture rete, adds soft micro lens array rete again; Add the Micropicture layer on surfaces such as various commemorative coin badges, add the micro lens array of soft or hard again; On various card classes, adhere to the multiple different scope of applications such as figure, lens.

Method of the present invention is used to differentiate the true and false of banknote or is used for the false proof of commodity or is used for surperficial special amplification display effect such as various commemorative coins, badge, various card classes.Its display effect can be divided into following four classes: the one, and single figure solid color demonstration, the 2nd, the multiple color demonstration of single figure, the 3rd, multiple figure solid color demonstration, the 4th, multiple figure multicolour shows.Effect is decided by Micropicture.If only designed and produced a kind of pattern, and have only a kind of color, then display result is identical with it.Effect is decided by Micropicture, if Micropicture by different graphic and different color, then display result is more rich and varied.

Principle of the present invention is: the micro lens array of continuous surface is a kind of micro optical element based on refraction principle, and when cross sectional shape when being protruding, each sub-lens has the function of amplification.The array element is exactly a plurality of set with sub-lens of enlarging function.The method that produces Micropicture has printing, sends out sheet, laser printing, microfabrication, microscopic carvings quarter etc. is multiple, design and with the close or consistent with it micro lens array of the method for microfabrication making bore, by separate type and combined type in conjunction with both, each sub-lens has amplification effect to corresponding subregion, so just the character in the subregion has been amplified, utilized this special amplification display effect to reach false proof purpose.

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

1. the array mode of micro lens array and Micropicture is versatile and flexible;

2. amplify the display effect uniqueness, do not observe the micrographics that naked eyes can't be differentiated by instrument, the equipment of complexity;

3. same sample is realized multiple display effect and is had strong innervation and three-dimensional stereo effect;

4. the producing method of lenticule and micrographics is varied, requires lowly, does not need strict counterpoint, and is with low cost;

5. attractive in appearance, practical, easy to carry.Applied widely, have good market outlook.

Description of drawings

Fig. 1 is amplification displaying principle figure of the present invention;

Fig. 2 is the synoptic diagram that adopts array mode in the step of the present invention (3);

Fig. 3 is the synoptic diagram that adopts separate mode in the step of the present invention (3);

Fig. 4 is the micrographics structural representation that the embodiment of the invention 1 is made;

Fig. 5 is the microphoto that the embodiment of the invention 1 is made lens array;

Fig. 6 is the embodiment of the invention 1 a display result synoptic diagram;

Fig. 7 is the micrographics structural representation that the embodiment of the invention 2 is made;

Fig. 8 is the 3 D stereo synoptic diagram of the lens array of the embodiment of the invention 2 making;

Fig. 9 is the embodiment of the invention 2 display result synoptic diagram;

Figure 10 is the micrographics structural representation that the embodiment of the invention 3 is made;

Figure 11 is the embodiment of the invention 3 display result synoptic diagram.

Sequence number implication among the figure: continuous micro lens array 1, Micropicture 2, not in conjunction with micro lens array zone 3, in conjunction with micro lens array zone 4, a kind of display effect 5 of multiple pattern, the another kind of display effect 6 of multiple pattern.

Embodiment

Embodiment 1, as Fig. 1, shown in Figure 4, at first makes Micropicture or microstructure, adopt better simply sheet method to finish, the bore that designs each spirte is 200 μ m, and figure is a crescent shape, produce output by sending out the sheet machine, be formed on organic material, on plastic film; Second, method with microfabrication, make the micro lens array that bore and Micropicture bore 200 μ m and shape are complementary, the making of shape micro lens array adopts mobile mask means to be formed at gelatin photoetching material surface continuously, manufacturing process can be adopted dry method or wet etching or dried wet method combination, in the organic plastics surface, lenticular microphoto as shown in Figure 5 by the method transition diagram that duplicates; At last, adopt the gluing method of combined type, as shown in Figure 2, be combined into Micropicture and micro lens array, obtain amplification, demonstration, three-dimensional stereo effect both combinations; Its display result has been added the local of micro lens array and the place contrast of additional micro lens array is very not strong as shown in Figure 6, and is that the figure that with the naked eye can't differentiate of 200 μ m shows significantly with bore.

Embodiment 2, the μ character making and demonstration.

At first, make Micropicture or microstructure, adopt the laser direct-writing legal system to obtain Micropicture or microstructure as mask plate, the bore 100 μ m of the spirte of design, figure is the μ character, directly is produced on the chromium laminar surface on the substrate of glass, as shown in Figure 7.Continuously the shape micro lens array is with the moulding of gray-tone mask method, and the method by direct etching is formed at optical material surface (as melting quartz, K9), is the line drawing of micro lens array as shown in Figure 8.Adopt the separate type method, as shown in Figure 3.The display result that obtains during observation as shown in Figure 9.

Embodiment 3, the demonstration of multiple figure.

At first, adopt laser printing to obtain Micropicture, the bore of spirte is 150 μ m, and figure is square and circular two kinds, as shown in figure 10; Make microlens array again, adopt the gray-tone mask method to be shaped on photoetching material, and then lenticule is compressed on frosting, both combine by mould again.

Embodiment 4, adopt the method for diamond turning to make the convex lens array, and the horizontal section is circular.Base material is a K9 glass, spirte bore 500 μ m.Above the various card classes of minute pattern production, both adopt separate type, when independent use, have the card of Micropicture and other is not as broad as long with the card of Micropicture, behind the affix micro lens array, produce to amplify and show and dynamic special-effect.

Embodiment 5, adopt the photoetching hot melt to make Micropicture, and the spirte bore is 50 μ m, and the horizontal section is a regular hexagon.Be fabricated in the optical plastic substrate by the method for duplicating.Be made into the souvenir badge, the Micropicture of using the making of photograph reprint method of printing is attached to its lower surface, and both are closely linked.

Claims

1. The continuous microlens array magnification display anti-counterfeiting method is characterized in that it comprises the following steps:

(1) Design and manufacture fine graphics or microstructures;

(2) Using the method of microfabrication, make the microlens array whose caliber matches the micrographic;

(3) Combining micrographics and microlens arrays to obtain magnification, display, and three-dimensional effects.

2. The continuous microlens array magnification display anti-counterfeiting method according to claim 1 is characterized in that: the method for making micrographics or microstructures in the step (1) is to use printing, hair filming, laser printing, Micromachining, micro-engraving and other methods.

3. The continuous microlens array magnification display anti-counterfeiting method according to claim 1 is characterized in that: the microfabrication method in the described step (2) adopts mask moving method, gray scale mask method, photolithography The hot melt method forms on the photolithographic material.

4. The anti-counterfeit method according to claim 3, characterized in that: said photoresist material is photoresist or gelatin.

5. The anti-counterfeiting method for enlarging and displaying continuous microlens arrays according to claim 3, characterized in that: said forming method adopts dry or wet etching or a combination of dry and wet methods.

6. The anti-counterfeiting method for enlarging and displaying continuous microlens arrays according to claim 1, characterized in that: the unit section of the microlens array is convex, and the horizontal section shape is circular or square or the number of sides is greater than or equal to 5 of polygons.

7. The anti-counterfeiting method for enlarging and displaying continuous microlens arrays according to claim 1, characterized in that: in the step (3), combining the micrographics and the microlens arrays adopts a separate method according to the microlens arrays. or combined.

8. The continuous microlens array magnified display anti-counterfeiting method according to claim 7, characterized in that: said separate type is that the microlens array and the micro graphics can be used separately, and when the two are directly attached, the magnified display will be generated Effect.

9. The anti-counterfeiting method for magnifying and displaying continuous microlens arrays according to claim 7, characterized in that: said combined type is to integrate the microlens arrays on the fine graphics by means of film pressing or glue bonding.

10. The anti-counterfeiting method for enlarging and displaying continuous microlens arrays according to claim 3, characterized in that: the formed carrier is a soft material such as a film layer or an organic material surface, or a hard material such as optical glass or optical plastic. quality material.

11. The continuous microlens array magnification display anti-counterfeiting method according to claim 1, characterized in that: the method is used to identify the authenticity of banknotes or for anti-counterfeiting of commodities or for various commemorative coins, badges, Special magnification display effects on the surfaces of various cards and the like.