EP2608161A1 - Vérification de documents de valeur avec une fenêtre à microstructures à action optique - Google Patents

Vérification de documents de valeur avec une fenêtre à microstructures à action optique Download PDF

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Publication number
EP2608161A1
EP2608161A1 EP20120008374 EP12008374A EP2608161A1 EP 2608161 A1 EP2608161 A1 EP 2608161A1 EP 20120008374 EP20120008374 EP 20120008374 EP 12008374 A EP12008374 A EP 12008374A EP 2608161 A1 EP2608161 A1 EP 2608161A1
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EP
European Patent Office
Prior art keywords
information
display
grid
arrangement
pixels
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.)
Ceased
Application number
EP20120008374
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German (de)
English (en)
Inventor
Peter Schiffmann
Christian Fuhse
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giesecke and Devrient GmbH
Original Assignee
Giesecke and Devrient GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
Publication of EP2608161A1 publication Critical patent/EP2608161A1/fr
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/351—Translucent or partly translucent parts, e.g. windows
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/20—Testing patterns thereon
    • G07D7/202—Testing patterns thereon using pattern matching
    • G07D7/207—Matching patterns that are created by the interaction of two or more layers, e.g. moiré patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/23—Identity cards
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/24—Passports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • B42D2033/26—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/324—Reliefs

Definitions

  • the invention relates to a method and a device for verifying documents of value such as banknotes, securities, credit, debit or ID cards, passports, documents, tickets, tickets and the like, labels, packaging, tax stamps, cigarette strips or other elements for product assurance or marketing campaigns.
  • a first information is arranged in at least one transparent area of a security element.
  • a separate display such as a screen of a computer, notebook or laptop, a monitor of a cash register of a cash register system or a display of a handset, at least partially displays a second information. Either in the first or the second information or also in both information, further information is hidden, which is not or only barely recognizable and / or readable for a viewer without aids.
  • a verification of the security element is carried out by the first information in the translucent area of the security element is placed on the second information and the hidden information is recognizable and / or readable.
  • the invention further relates to a corresponding method for verifying or checking valuables having a display, for example a computer, notebook or laptop, a cash register of a cash register system, television or a hand-held device.
  • the hidden information advantageously contains, for example, the emission value or the currency of a banknote and can thus serve as an authenticity check at a point-of-sale terminal.
  • the banknote is placed over the display of the point-of-sale terminal and the information hidden on the banknote is displayed in plain text for the cashier.
  • a moiré pattern results when a grid of diffusing elements of dummy embossing or optical lenses is applied to the light-transmissive area of the security element or the verification element and a micro-information matched to the scattering elements is displayed on the display.
  • the micro-information is represented by the superposition of the grid of scattering elements magnified many times, but must be adapted to the grid of the security element or the verification element.
  • the known from the prior art indirect high pressure in conjunction with the substrate to be printed usually allows for positive lines a minimum line width of 40 microns and negative lines of 80 microns.
  • a positive line is a printed line-shaped area formed by a printing ink
  • a negative line is a recessed line-shaped area without printing ink in a full-area or raster-shaped printed area.
  • offset printing a minimum line width of 30 ⁇ m can be achieved with positive lines and a minimum line width of 50 ⁇ m with negative lines.
  • the line width increases, which can amount to approx. 5 ⁇ m on each side of the line. This increases the actual line width, for example, to 40 ⁇ m for positive lines in offset printing and to 50 ⁇ m for indirect high pressure.
  • the so-called retina display of the current smartphone "iphone 4" from Apple has a resolution of 960 ⁇ 640 pixels with a screen size of 8.9 cm or the so-called AMOLED display of the smartphone "Galaxy S I9000" from the company Samsung® has a resolution of 480x800 pixels with a screen diagonal of 10.2 cm.
  • the invention is therefore the object of developing a generic security element such that the disadvantages of the prior art is eliminated and the protection against counterfeiting is further increased.
  • the first information is formed by a grid-like arrangement of optically active microstructures.
  • an optically effective microstructure With an optically effective microstructure, the necessary resolution is achieved in order to produce a grid which has a high resolution on the display matrix Displays is tuned or can be adapted to even higher resolution future displays.
  • a microstructure in the sense of this invention is a structure having a lateral dimension, i. whose length and / or width, in the micrometer range.
  • the length and / or width is less than 50 microns, and more preferably less than 30 microns.
  • the grid-like arrangement of optically effective microstructures is adapted to the grid-like arrangement of pixels of the display.
  • a pixel is understood to be a single pixel of the display.
  • a pixel represents a bright-dark contrast, for example, by allowing the pixel to pass light of a backlight or not.
  • a pixel In a color display, a pixel consists of a single color information, for example, a red color information that similar to a color filter can pass only the red spectral component of the backlight of the display or not.
  • a combination of differently colored pixels for example red, green and blue pixels, creates the color of the display.
  • An arrangement of a red, a green and a blue pixel is referred to in the context of this invention as an RGB sequence.
  • the display of the smartphone "Galaxy S I9000" Fa. Samsung® rectangular or square pixels, which consist of an RGB sequence of a red, green and blue pixels, with a plurality of these RGB sequences alternately in lines and Columns are arranged side by side or one above the other.
  • the grid-like arrangement of optically active microstructures is adapted to the grid-like arrangement of pixels of the display such that the microstructures have the same dimensions as the pixels of the display and are arranged in the same grid.
  • the microstructures would thus have an approximately square surface with an edge length of about 0.11 mm and would be arranged in rows and columns next to or above one another like a matrix.
  • not only one pixel, but several pixels are assigned to a microstructure.
  • a microstructure For example, three RGB sequences on top of each other in a 3x3 matrix of 9 pixels, so that a single microstructure each has the triple dimension or the nine-fold area compared to a microstructure of the previous example, i. an edge length of 0.33 mm.
  • the dimensions of a respective microstructure may thus be an integer multiple of the dimensions of a pixel or a group of pixels of the display.
  • a plurality of microstructures are each assigned to a pixel of the display.
  • one pixel is assigned four microstructures arranged in a square or rectangular 2x2 matrix.
  • Assignment in this context does not just mean that a special pixel or a special Assignment of pixels of the display of a particular microstructure is assigned, for example, the pixel in the 7th row and the 3rd column of the microstructure in the 14th row and the 6th column. Rather, association also means that any pixel or arrangement of pixels can interact with any microstructure of the verification element.
  • the dimensions of a particular microstructure may be n / m times the dimensions of a pixel or group of pixels of the display, where n and m are each a natural number except zero, i. one of the positive integers 1 or 2 or 3 or 4 etc.
  • neither the pixels of the display nor the microstructures need to have a square shape. Rather, any shape is possible, for example, rectangular, round or triangular. Also, neither the pixels of the display nor the microstructures need to be arranged in a rectangular nxm matrix. Rather, any grid-like arrangement is possible, for example, a parallelogram-like matrix or an arbitrary offset from line to line of a matrix.
  • an RGB sequence can also consist of five pixels.
  • a pixel of a certain color for example the blue pixel, is arranged on a tip in the middle of the RGB sequence, one red pixel on the top left and bottom right and one green pixel on the bottom left and one pixel right upper side of the blue pixel.
  • an RGB sequence may be opposite to the corresponding order of an adjacent one Be changed line.
  • an RGB sequence may consist of a red pixel next to a blue pixel next to a green pixel, and in the next line, a green pixel next to a blue pixel next to a red pixel.
  • the blue pixels of both lines thus border each other, the red and green pixels alternate from line to line.
  • the optically active structures are formed by a grid-like arrangement of at least translucent, preferably transparent microlenses and / or microprisms.
  • the microprisms each consist of two flanks which are arranged at a certain angle to one another, wherein only the first flank is provided with an opaque surface coating.
  • a display ie a display device, which can alternately display different information or even no information, is preferably an active display with its own illumination source, which illuminates the display from the back.
  • the display can also be a passive display without its own illumination source, with a reflective surface, which is arranged on the back of the display, reflecting daylight or room light and thus illuminates the display indirectly.
  • the invention is preferably also applicable to a novel transparent display whose Body is perceived by a viewer as (nearly) transparent.
  • the transparent display itself acts as a (nearly) transparent window and the information displayed on the transparent display is displayed as a single or multi-colored haze of the window, which influence or attenuate the light passing through the transparent display.
  • the hand-held device is, for example, a mobile phone or smartphone, a digital camera, digital clock, a credit card or an identification document, for example a passport or an identification card, with a display or a portable playback device for video or audio signals.
  • information is not or only barely recognizable whenever a viewer sees or perceives it without aids from the surrounding information or only at random and weakly. In the same sense, information is always not or only barely legible if a viewer the alphanumeric or textual content of the information without aids from the surrounding information is not or only accidentally and weakly pronounced or read or can not interpret properly.
  • a grid with a reduced resolution can be displayed on the display, the reduced resolution corresponding to the resolution of the grid-like arrangement of optically active microstructures is adapted to the verification element.
  • colored lines may appear on the display, whose line spacing corresponds to the spacing of adjacent microstructures of the verification element.
  • At least one third information is contained in the first information.
  • the third information covers only a portion of the surface of the first information, so that the viewer can recognize both the hidden information and the second information.
  • the third information is preferably recognizable and / or readable to the viewer in the visible wavelength range without aids.
  • the third information may not be visible to a viewer in the visible wavelength range, for example, by being recognizable in the ultraviolet or infrared wavelength range.
  • the third information can also be visible or recognizable for a viewer both in the visible and in the invisible wavelength range, for example by being recognizable in the visible and also in the ultraviolet or infrared wavelength range. Visible here means that a viewer can optically perceive information without aids, recognizable means that a viewer can perceive information only by means of aids, for example by means of measuring devices.
  • This third information may in this case represent an alphanumeric text, a symbol or any graphic and be applied to the top or bottom of the transparent area of the substrate in which the first information is located.
  • the application may in this case preferably by means of printing processes, for example printing opaque or translucent colors by means of offset printing, or by vapor deposition, such as PVD (physical vapor deposition or physical vapor deposition) or CVD (chemical vapor deposition).
  • a layer may be applied to the top or bottom of the transparent region, the third information being generated by partially ablating this layer. This is done, for example, by a part of the layer by means of a known from the prior art washing method (as it is, for example EP 1 023 499 A1 is known), by laser ablation or by mechanical methods (for example, by planing) is removed again.
  • the third information can be formed by a grid of line-shaped and / or punctiform elements.
  • the linear and / or punctiform elements of the grid of the third information are offset relative to the linear and / or punctiform elements of the grid of the first information and / or have a different line thickness or a different point diameter.
  • the invention is an extension of the subject matter WO 2009/019038 A1 is the subject and scope of the WO 2009/019038 A1 in this regard is included in this invention. This means in particular that corresponding embodiments, embodiments and concretizations of WO 2009/019038 A1 can also be applied to this invention.
  • Fig.1 shows an actively lit display 1, which consists of an alternating arrangement of red r, green g and blue b pixels, wherein the arrangement of red, green and blue pixels repeats periodically with a period p. If a grid of microlenses 2, which have the same period p as the pixels of the display 1, are arranged above the display 1, a microlens 2 is located above each arrangement of a red, green and blue pixel.
  • the dimension of the individual pixels of the display 1 is below the resolution of the human eye. If all pixels have a similar or the same brightness, the display 1 appears to a viewer as a homogeneous white area. As is known, the human eye has a particularly high sensitivity during the day in the green spectral range. Thus, if a display is used in which all the pixels have the same lateral dimensions, i. E. For example, if the green pixels are the same diameter or the same width and length as the red or blue pixels, the brightness of the green pixels must be reduced from the brightness of the red and blue pixels, so that all the pixels or colors provide the same brightness impression to a human eye produce and thus gives the impression of a homogeneous white area. Alternatively, a display may be used in which different colored pixels have different lateral dimensions, i. For example, the green pixels have a smaller area than the red and blue pixels.
  • the distance between the display 1 and the lenticular grid 2 also corresponds to the focal length of the lenses, then all the light beams 3 which are emitted perpendicularly by the pixels which are located in the focal point 4 of the lens are directed to the observer.
  • the distance of the observer from the security element is in this case large compared to the lateral dimensions of the verification element, so that all light rays that run from the verification element to the viewer, run almost parallel.
  • the lenticular appears when viewed vertically either red, green or blue, depending on which pixel is located in the focal point 4 of the lenses. If the lenses are divided into different subregions 5 and 6 and the individual subregions 5 and 6 are shifted relative to one another, for example all lenses in subarea 5 appear green and all lenses in subarea 6 blue when viewed vertically.
  • a color change results since, as is known, the focal point 4 also shifts with the viewing direction and the focal point 4 strikes a pixel of a different color. For example, if a viewer looks at an angle of about 10 ° from the right (in relation to the vertical in Fig.1 ) on the verification element, the sub-area 5 appears red, instead of green as viewed vertically, and the sub-area 6 green, instead of blue, as in vertical viewing.
  • the verification element itself i. the grid-like arrangement of microlenses without the display 1, appears to a viewer only as a matter of matter, since the background or the environment is far outside the focal plane of the microlenses.
  • the lenses are divided into different subregions 5 and 6 and the individual subregions 5 and 6 are shifted from one another, so that, for example, all the lenses in a first subarea 5 appear green and all lenses in a second subarea blue.
  • the microlenses are preferably designed as rotationally symmetrical lenses, such as spherical or aspherical lenses, as cylindrical lenses or as Fresnel lenses.
  • Fresnel lenses depends on the ratio of the pixel size of the display to the technically possible or technically advantageous embossing depth or height of the lens.
  • the result is a lens height or embossing depth which corresponds to half the lateral dimension of a pixel of the display, ie preferably 50 ⁇ m embossing depth or height of the lens, for example for a 100 ⁇ m pixel width.
  • such lens heights would be too great, since the foil strip would become too thick, so that it would be necessary to resort to Fresnel lenses which are known to have a much smaller height.
  • hemispherical lenses with such dimensions are quite usable.
  • Fig. 2 shows a verification element according to the invention, in which the first information is formed by microprisms.
  • the emission characteristic of a liquid crystal display is usually anisotropic, i.
  • the brightness of the display decreases from a vertical view to a view at grazing angle. If the display is tilted, the display will appear differently bright for a viewer.
  • Microprisms ie prisms with dimensions in the micrometer range, divert the direction of propagation of light something known.
  • Fig. 2 arranged a verification element with a grid of microprisms 11 in front of a liquid crystal display 10, can produce changed brightness differences.
  • a viewer sees the display 10 with its full brightness and at a viewing angle 15, which is inclined for example by 30 ° with respect to the vertical, the display with reduced brightness ,
  • the microprisms redirect the light in such a way that a viewer, when viewed perpendicularly, 16 sees the light originally emitted by the display at an angle of, for example, 10 ° with respect to the vertical.
  • the brightness of the display with the superior microprisms appears therefore reduced.
  • the bright light originally emitted by the display in the vertical direction is deflected by the microprisms in the direction 17, so that the viewer from this direction appears brighter than in the area without microprisms.
  • Areas with and without microprisms thus appear brighter or darker to a viewer from different areas, i. a surface area with microprisms is darker when viewed perpendicularly than a surface area without microprisms. At greater angles, the difference in brightness turns and the area with the microprisms appears brighter than the area without microprisms.
  • the lateral dimensions of the microprisms can, as in Fig. 2 shown to be smaller than the pixels of the display. This has the advantage that the microprisms have a lower embossing depth than microprisms whose lateral dimensions are larger than those of the pixels of the display, ie corresponding security elements are thinner and usually less expensive manufacture. However, if the thickness of the verification element plays a rather subordinate role, the lateral dimensions of the microprisms may also be greater than those of the pixels of the display.
  • the microprisms may be arranged on the top and / or bottom of a verification element.
  • the microprisms, as well as the lens structures described above may be embedded in a protective lacquer which has a different refractive index than the prisms, which are preferably embossed in an embossing lacquer.
  • diffraction gratings deflect a portion of the incident light in transmission into the corresponding diffraction orders and reduce the brightness in a perpendicular view, while the brightness can be increased at other angles and diffraction-related color effects can occur.
  • light-scattering structures for example matt structures, which do not reflect light but scatter it over a larger angular range and thus likewise reduce the brightness in a vertical plan view and increase it at other angular ranges.
  • an array of diverging lenses preferably plano-concave lenses, is used as a grid-like arrangement of optically active microstructures.
  • a color change is generated depending on the viewing direction, if the respective diverging lens on the Size of a pixel is tuned, or a light / dark difference, if the respective diverging lens is at least twice as large as a pixel.
  • a diverging lens could cover a single blue pixel.
  • the light cone of the blue b pixel is then widened and appears darker in vertical plan, i. a white image will be less blue in vertical view and therefore yellowish.
  • the diverging lenses could be staggered, for example over a green g pixel.
  • the green component would be reduced in vertical supervision, i. a white representation will appear magenta-like.
  • the display could glow red or green all over. Then once the first and once the second area depending on the viewing angle would appear brighter or darker than the display.
  • a second film is applied at least to the region of the verification element in which the lens or mirror structures are located.
  • This second film covers the lens or mirror structures, so that it is no longer possible for a counterfeiter to mold the otherwise exposed lens or mirror structures.
  • the second film is preferably attached to its edge with the verification element, for example glued or welded, and additionally attached to the tips of the lens or mirror structures within the surface of the verification element. In this way, it is advantageously achieved that the second foil can not be detached from the verification element in a counterfeit attack without destroying the lens or mirror structures.
  • Fig. 3 shows a verification element 20 according to the invention, in which the first information is formed by unilaterally vaporized microprisms.
  • the microprisms each consist of two flanks, which are arranged at a certain angle to each other. Only the first flank is provided with an opaque surface coating 21, the second flank has no or at least a translucent surface coating.
  • the surface coating 21 is preferably vapor-deposited onto the respective flank, for example by means of PVD (physical vapor deposition).
  • Fig. 3 Even different directions can be generated depending on the direction.
  • sawtooth gratings of a first orientation in transmission from direction 25 and 26 are opaque and thus opaque. From direction 27 you can see through the "slats" as through a transparent line grid.
  • the sawtooth grids are aligned so that you can see through the slats from the direction of view 25 and the display is visible. If the sawtooth grid is tuned so that there is only one green, blue or red pixel of the display under a single sawtooth, it is possible not only to create a light-dark difference, but also to change the color impression when viewed from the side. This can be done partially, ie only on a single or a few pixels, as well as over a large area. In the viewing angle 27, the display appears in the region 22, for example, green and in the region 24, for example, red.
  • a superficial first motif is represented by the outline of the partial metallization, which is already perceived without a display.

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  • Engineering & Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Credit Cards Or The Like (AREA)
EP20120008374 2011-12-21 2012-12-17 Vérification de documents de valeur avec une fenêtre à microstructures à action optique Ceased EP2608161A1 (fr)

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DE102011121895A DE102011121895A1 (de) 2011-12-21 2011-12-21 Verifikation von Wertdokumenten mit einem Fenster mit optisch wirksamen Mikrostrukturen

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EP2608161A1 true EP2608161A1 (fr) 2013-06-26

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US10252563B2 (en) 2015-07-13 2019-04-09 Wavefront Technology, Inc. Optical products, masters for fabricating optical products, and methods for manufacturing masters and optical products
US10850550B2 (en) 2016-04-22 2020-12-01 Wavefront Technology, Inc. Optical switch devices
US10859851B2 (en) 2014-10-24 2020-12-08 Wavefront Technology, Inc. Optical products, masters for fabricating optical products, and methods for manufacturing masters and optical products
CN113031256A (zh) * 2019-12-09 2021-06-25 觉芯电子(无锡)有限公司 一种集成透镜阵列的微镜、微镜制备方法及激光显示系统
US11113919B2 (en) 2017-10-20 2021-09-07 Wavefront Technology, Inc. Optical switch devices
US11221448B2 (en) 2019-04-19 2022-01-11 Wavefront Technology, Inc. Animated optical security feature

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DE102013010941A1 (de) 2013-06-28 2014-12-31 Giesecke & Devrient Gmbh Sicherheitselement mit adaptiven fokussierenden optischen Elementen

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EP1023499A1 (fr) 1997-09-08 2000-08-02 Giesecke & Devrient GmbH Feuilles de securite pour papier billet de banque et leur procede de fabrication
WO2003067797A1 (fr) * 2002-02-07 2003-08-14 Koninklijke Philips Electronics N.V. Procede de communication de messages visuels proteges et dispositif associe
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