WO2003073173A2 - Unite de marquage holographique portable - Google Patents

Unite de marquage holographique portable Download PDF

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Publication number
WO2003073173A2
WO2003073173A2 PCT/US2003/005039 US0305039W WO03073173A2 WO 2003073173 A2 WO2003073173 A2 WO 2003073173A2 US 0305039 W US0305039 W US 0305039W WO 03073173 A2 WO03073173 A2 WO 03073173A2
Authority
WO
WIPO (PCT)
Prior art keywords
unit
marking unit
recited
substrate
portable
Prior art date
Application number
PCT/US2003/005039
Other languages
English (en)
Other versions
WO2003073173A3 (fr
Inventor
Serge Habraken
Denis Vandormael
Original Assignee
University Of Liege
Idea, Inc.
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 University Of Liege, Idea, Inc. filed Critical University Of Liege
Priority to AU2003213145A priority Critical patent/AU2003213145A1/en
Publication of WO2003073173A2 publication Critical patent/WO2003073173A2/fr
Publication of WO2003073173A3 publication Critical patent/WO2003073173A3/fr

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/0005—Production of optical devices or components in so far as characterised by the lithographic processes or materials used therefor
    • G03F7/001—Phase modulating patterns, e.g. refractive index patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/0276—Replicating a master hologram without interference recording
    • G03H1/028—Replicating a master hologram without interference recording by embossing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0827—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using UV radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
    • B29C59/022—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing characterised by the disposition or the configuration, e.g. dimensions, of the embossments or the shaping tools therefor
    • B29C2059/023—Microembossing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0888—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using transparant moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
    • B29C59/022—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing characterised by the disposition or the configuration, e.g. dimensions, of the embossments or the shaping tools therefor

Definitions

  • the present invention pertains generally to a holographic marking unit and, more specifically, to a portable holographic marking unit for appending a holographic stamp or pattern onto any kind of transparent or non-transparent substrate.
  • Holographic patterns are extensively used for numerous purposes, going from decoration and personalization to security certification and sealing attestation of items.
  • display holography consists in restituting a real appearance of a three dimensional object with a single photographic plate, giving an illusion that the real object is located in a box, just behind a plate.
  • fabrication of holograms consists, in general, of recording on a holographic plate 10 information given by two interfering laser beams 12, 14.
  • One of them, called an object wave 12 is shaped dependent upon elements it encounters during its travel from a laser 16 to the plate 10.
  • An infinity of shapes are possible for the object wave 12, depending on the optical function it has to play, and which optical system it passes through or what 3D object it reflects from.
  • the second beam remains unaltered and is used as a reference beam 14.
  • interference patterns are transformed into a diffractive structure.
  • the reference beam 14 illuminates the processed plate 10, it reconstructs the object beam 12 by diffraction 17, restituting the information this object beem was carrying at a recording stage. This way if, at the recording stage, the object wave 12 was the light reflected by a 3D object 20 placed behind the plate 10, the reconstruction will give to an observer 22 an illusion that this 3D object 20 stands behind the plate 10 when it is illuminated by the reference beam 14.
  • Some adaptations of the technique allows the hologram to be read with a divergent white light source, giving some sort of rainbow aspect to the apparent object, as seen on credit card holograms.
  • the diffractive structures are widely used in a vast range of applications. Scientific equipment or any kind of high-tech light-based applications, like spectrometers, optical multiplexing and interconnection devices, beam shaping systems, are taking benefits from the advantageous properties of these elements. Indeed, they are able to integrate several optical functions, such as dispersion, correction of aberration, polarization, and magnification, onto a single very compact arrangement, unachievable with conventional optics. In everyday life, such diffractive structures take an important place and can be found in equipment like CD players and scanners, or in some imaging, security or automation devices.
  • Figures 2A, 2B and 2C show, in general, replication of a master 23 and a forming of a replica by hot-embossing and UV- embossing.
  • the master 23 is, in this example, made of nickel and is formed on a substrate 56.
  • the holographic plate 20 is made of photosensitive resin and, during recording, a photosensitive layer 25 is exposed to a contrasted interference pattern 26. Illuminated parts of this material are removed at the processing stage, giving rise to a relief diffractive structure, in accordance with the contrasted interference pattern 26, which was exposed during the recording stage .
  • the master 23 is used for the replication steps, where a large number of copies will be replicated by transferring the relief structure of the master 23 into a low cost formable material on the substrate 24.
  • hot-embossing technique is used as shown in Figure 2B.
  • the nickel master 23, grown from the photoresin layer 25, is a die for hot-pressing equipment or heater 36 which is used to transfer a relief structure into thin polymer or plastic films 57 to form a plastic replica 29.
  • These plastic replicas are then metallized, protected, cut and converted into self-adhesive stickers or into hot-stamping foils for direct application on pre-existing substrates.
  • replication can be carried out by applying the nickel master 23 on a surface of the substrate 24 where a hardening UV-curable material 38 has been coated. After hardening, the master 23 is separated from the resulting replication 29 which thus forms part of the substrate 24.
  • a UV curable polymer is used as hardening material and the process is called UV-embossing.
  • holograms can be used for security purposes, as well.
  • Holographic fabrication is based upon the recording of an image which is unique and original. Additionally, holographic fabrication currently requires high cost laboratory equipment. Because of the high cost of the equipment and the uniqueness of the original object, counterfeiting is drastically reduced. This means that there is an opportunity to use holograms for security purposes and for good origin attestation.
  • 3D holograms can be found on credit cards, like the VISA dove or the EC Beethoven. Holograms can also be found on various original and registered product packages like inkjet printer cartridges or pre-recorded video tapes. When they are applied to a given product, holograms attest that its original state has not been altered (e.g. for credit cards or sealed cases of any kind) . Unfortunately, such holograms are only produced in high volume series (several millions) . Indeed, only large companies are equipped with the high priced equipment such as rotary presses, so that production becomes profitable when it reaches several hundreds of thousands items.
  • the present invention seeks to provide a portable holographic marking unit which is particularly adapted for a performing holographic marking by transferring a replica of a diffractive structure, originally engraved on a master, into a hardening material which becomes part of the marked item. More specifically, compared to a classical UV-embossing process, the holographic unit of the present invention can place markings onto opaque substrates and, thanks to its portability, does not require the dismounting of the items to be marked. It is particularly suitable for small series markings on an extremely large range of supports.
  • the device of the present invention can place the replication of an original diffractive structure on a preexisting surface such as a window, a windshield, and also on a non-transparent substrate such as a document or a parcel. It can be used for security purposes and also for personalizing and decorative purposes.
  • the holographic stamp of the present invention is based upon the same principle as a conventional stamp where ink has been replaced with a hardening material and a rubber stamp with a flexible piece where a replica structure such as a 3- dimensional holographic structure has been engraved.
  • the replica structure can be a rather simple diffraction grating or a much more personalized holographic logo. Marking is carried out by coating the surface of the flexible piece with a hardening material before it is applied to the surface to be marked. Once the material is hardened, the flexible piece is separated from the resulting replication which thus forms part of the transparent or non-transparent surface.
  • the flexible piece can be easily released from its mounting and replaced by another one.
  • the portability of the device allows one to bring the equipment to the item to be marked without dismounting the item to be marked from its location.
  • hardening can also be carried out by exposing the whole system to a light beam. Since, the flexible piece is transparent, an illuminating device can be integrated into the handle of the portable device so that the light can pass through the flexible piece and harden the photosensitive material. This allows opaque surfaces to be marked.
  • the light-curing option does not reduce the portability of the device but shortens the hardening time.
  • the unit has a handle forming an outer casing and inner casing to mount components of the unit.
  • the components include an internally mounted light source which is partially encapsulated by the inner casing and provides illumination for the unit on the substrate.
  • Another object of the invention is to provide a transparent window which forms another part of the unit with the inner casing to pass the illumination of the internally mounted light source to the substrate.
  • a still further object is to provide a reflector positioned between the internally mounted light source and the inner casing to redirect the illumination from the light source through the window and onto the substrate .
  • Another object of the invention is to provide that the window is of a quartz material, and that the light source is ultraviolet .
  • a still further object of the invention is to provide a soft mold wherein the soft mold is a flexible and transparent stamp, and has a diffractive structure engraved on an outer most exposed surface, and the diffractive structure shows detailed features smaller than 1 micrometer width and depth, wherein the soft mold is made of a silicone-elastomer, and is for use in electronics and micro-optics.
  • a still further object of the invention is to provide the window as a support and the stamp is mounted onto the window to enable its handling.
  • An object of the invention is to provide the unit as a kit with the light source being an ultraviolet illuminating lamp emitting at 365 nm, and the lamp having an intensity of approximately 20-40 W/cm2.
  • Another object of the invention is to provide the kit with a ultraviolet curable polymer which is a clear, colorless, liquid that will cure when exposed to ultraviolet light, and has a maximum absorption range of 350-380 nanometers.
  • Yet another object for the present invention is to provide a portable holographic marking unit in accordance with the preceding objects and which will conform to conventional forms of manufacture, be of simple construction and easy to use so as to provide a device that will be economically feasible, long lasting and relatively trouble free in operation.
  • Figure 1A generally shows a recording of a diffractive grating on a holographic structure
  • Figure IB generally shows a reading of the diffractive grating of a holographic structure
  • Figure 1C generally shows a recording of a display hologram on a holographic structure
  • Figure ID generally shows a reading of the display hologram on a holographic structure
  • Figure 2A generally shows a holographic recording of a nickel master
  • Figure 2B generally shows three stages of replication by hot-embossing
  • Figure 2C generally shows three stages of replication by UV-embossing
  • Figure 3A is a schematic drawing of the operating components of a portable holographic marking unit of the present invention utilizing a self-hardening material;
  • Figure 3B is a schematic drawing of the operating components of the portable holographic marking unit of the present invention utilizing a light-hardening material and an external light source;
  • Figure 3C is a schematic drawing of the operating components of the portable holographic marking unit of the present invention utilizing a light-hardening material and a light source integrated in the handle;
  • Figure 4 illustrates the portable holographic marking unit of the present invention with a UV illuminating unit, UV lamp power supply, UV curable polymer and soft molds;
  • Figure 5 is an underside view of the UV illuminating unit illustrating a reflector, quartz window, UV lamp and casing of the present invention
  • Figure 6 illustrates a soft imprint fabrication as formed by the portable holographic marking unit of the present invention
  • Figure 7A illustrates a starting point for fabricating a holographic marking on a paper as the substrate with an aluminum foil strip as performed by the portable holographic marking unit of the present invention
  • Figure 7B illustrates a self-adhesion property of the soft mold as it is fixed to the quartz window of the portable holographic marking unit of the present invention
  • Figure 7C illustrates a dispensing of the UV-curable polymer on the soft mold affixed to the quartz window of the portable holographic marking unit of the present invention
  • Figure 7D illustrates an application of the portable marking unit to the paper and the aluminum foil strip with the UV lamp switched on as set forth in the present invention
  • Figure 7E illustrates a hardened and molded layer of polymer attached to the paper and aluminum foil strip as applied by the portable holographic marking unit of the present invention
  • Figures 8A and 8B show an example of of the holographic seal made by the portable holographic marking unit of the present invention being destroyed.
  • Figures 9A-9C illustrate a marking through a transparent member using the portable holographic marking unit of the present invention.
  • FIGS 3A, 3B and 3C show various uses of the portable holographic marking unit which is generally indicated by reference numeral 30.
  • the unit 30 includes a handle 32 and a holographic stamp 28 such as with a self-curing material 40, with the UV-curing material 38 and an external UV illumination, as well as with the UV-curing material 38 and an internal UV illumination 44.
  • the schematic drawing illustrates the operating components of the portable holographic marking unit 30 while utilizing the self-hardening material 40.
  • the handle 32 has the holographic stamp 28 previously formed and mounted to the unit 30.
  • the self-hardening material 40 is applied to the stamp 28.
  • the unit 30 is then, in step 2, placed on the substrate 24 and curing begins.
  • the self- hardening material has cured, the unit 30 is removed and the replica 29 is formed on the substrate 24, as illustrated in step 3.
  • Figure 3B is a schematic drawing of the operating components of the portable holographic marking unit 30 of the present invention utilizing the light-hardening material and the external light source 42.
  • the process is shown in three steps.
  • the handle 32 has the holographic stamp 28 previously formed and mounted to the unit 30.
  • the light-curing material 38 is applied to the stamp 34.
  • the unit 30 is then placed on the substrate 24.
  • the light 42 from the external source is directed to the opposite side of the substrate 24 and the replication process begins.
  • the replica 29 is formed on the substrate 24 and the unit 30 is removed and the light 42 switched off.
  • the process of Figure 3C is similar to the process described in Figure 3B.
  • the unit 30 has the internal light source 44 integrated or encapsulated by the handle 32 which allows, with the UV-curing material 38, opaque surfaces of substrate 24 to be marked, as illustrated in step 1.
  • the unit 30 and the holographic stamp 28 are placed on the opaque surface 24 to be marked.
  • the light from the internal source 44 is switched on and the replication process begins.
  • the light 44 is switched off and the replica 29 is formed on the substrate 24.
  • the portable holographic marking unit 30 is shown in Figure 4.
  • This embodiment illustrates a typical marking kit with an ultraviolet ("UV") illuminating unit which is based on a commercial Pen Ray Lamp emitting at 365 nm. This lamp has an intensity of approximately 20-40 W/cm2. High compactness can be achieved by integrating the UV lamp 44, a reflector 47 and an electrical circuit inside the handle 32.
  • UV ultraviolet
  • Power can be supplied either from electrical mains or from a battery unit 46.
  • An electric wire or cord 48 is used to connect the system to the portable power supply 46 which can be a 230V power supply.
  • an extension cord can be added to the electric wire 48 between the handle 32 and the power supply 46 in order to increase the portability and to favor handiness.
  • the soft mold or plastic film 28 is also shown in Figure 4 and is made of a special silicone-elastomer. These types of molds are used in electronics and micro-optics.
  • the UV curable polymer 38 is the commercially available Norland Optical Adhesive 61 ("NOA 61") which is a clear, colorless, liquid photopolymer that will cure when exposed to ultraviolet light.
  • NOA 61 Norland Optical Adhesive 61
  • the use of NOA 61 eliminates premixing, drying or heat curing operations common to other adhesive systems .
  • Curing time is fast, and is dependent upon the thickness applied and the amount of ultraviolet light energy available.
  • the adhesive is designed to give the best possible optical bond to glass surfaces, metals, fiberglass and glass filled plastics.
  • NOA 61 also has excellent clarity, low shrinkage and has light flexibility that make it superior to other materials for optical bonding.
  • NOA 61 is cured by ultraviolet light with maximum absorption within the range of 350-380 nanometers. The recommended energy required for full cure is 3 Joules/sq. cm in these wavelengths.
  • the cure is not inhibited by oxygen, hence any areas in contact with air will cure to a non-tacky state when exposed to ultraviolet light.
  • NOA 61 can withstand temperatures before aging from -15°C to 60° C when used for glass bonding. After aging, it will withstand temperatures from -150° C to 125° C.
  • FIG. 5 is a view of the underside of the portable holographic marking unit 30.
  • the unit 30 includes the handle or casing 32 which encapsulates the internal UV illumination light or lamp 44 entirely inside the unit 30. Surrounding the UV lamp 44 is the reflector 47 to redirect the UV light back and out the transparent quartz window 50 and towards a substrate to form a replica thereon.
  • the soft holographic stamp 28 is the imprint for the original master 23 which is recorded by a conventional holographic process, as discussed with reference to Figures 1A-1D.
  • the technique results in creating a microstructure on a surface of the photoresist layer 25.
  • the resulting master 23 exhibits some visual effects depending upon how sophisticated is the recording process (but the principle remains the same) .
  • the holographic formed on the master 23 can go from a typical rainbow aspects of the surface (in the case of a simple diffraction grating, like on the compact disc surface) up to very realistic effects (object reconstruction) like the famous VISA card dove.
  • object reconstruction object reconstruction
  • the replication of the original photoresist master 23 is performed by molding it with the commercially available Sylgard #184 manufactured by Dow Corning.
  • Sylgard #184 manufactured by Dow Corning.
  • the new soft holographic stamp 28 is demolded without damaging the original master 23. This allows multiple replication of one original master 23 into several soft imprints. N the present case, the original master 23 is a diffraction grating recorded through a mask with a CSL logo.
  • Figures 7A-7E illustrate the procedure for performing a holographic marking with the portable holographic marking unit 30.
  • marking is performed by coating the diffractive surface of the holographic stamp 28 with a hardening material before the whole unit 30 is applied to the surface to be marked.
  • Figure 7A shows a typical starting point wherein the substrate 24 is a sheet of paper with a thin aluminum foil stip 52 diagonally placed over the word "security”.
  • the soft mold 28 is fixed to the quartz window 50 of the portable holographic marking unit 30. Thanks to the self-adhesion property of the soft mold 28, it will affix to the quartz window 50 for a sufficient period of time.
  • Figure 7C illustrates the application of a small amount of UV-curable polymer 38 to the soft mold 28.
  • the portable holographic marking unit 30 is then applied to the paper 24 and the aluminum foil strip 52 to be sealed.
  • the internal UV lamp 44 is switched on.
  • the portable holographic marking unit 30 is removed, leaving a hardened and molded layer of polymer with a holographic mark 34 attached to the paper 24.
  • Figures 8A and 8B illustrate what happens if the aluminum foil strip 52 is removed.
  • the holographic mark 34 is damaged and the security of the document 24 can be visible noted.
  • Very confined spaces can be marked, thanks to the compactness of the portable holographic marking unit 30.
  • substrates 24 when substrates 24 is transparent, these transparent substrates can be marked by placing the soft mold 28 on one side and the portable holographic marking unit 30 with the UV light source on the other side.
  • the portable holographic marking unit 30 is capable of marking very confined spaces or curved surfaces such as bottles, glasses thanks to the softness of the mold 28.
  • the substrate 24 has to be longwave UV transparent.
  • curing time is increased as a function of a thickness of the glass.
  • excess of hardened glue can be removed with a sharp cutter, leaving a clean and well delimited marked.
  • Marking is rather sensitive to any kind of pollution which could fill the 3D microstructure and then alter the diffractive effect. This fact can be used as an advantage for security reasons (such as fingerprint tracing) or artistic purposes (for example, a hologram in a bottle is only seen after water has been removed) . Otherwise, marking has to be done in a way so that the marking will not be exposed to such altering factors or with a protective cap applied on it, as is the case for windshield marking. A metallized protective cap can be used in order to enhance the diffractive effect.
  • the soft mold 28 can be assembled with other ones into a common silicone-based and transparent support. This way, a system can be imagined where multiple holographic patterns are put together into a common circular ribbon, rolling around the UV internal lamp 44.
  • the symbol to be marked can be selected, just facing the quartz window 50 of the source of light from the UV lamp 44, like in classical ink stamps where any date can be chosen thanks to one ribbon for a day, a second one for a month and a third one for a year.
  • the portable holographic marking unit 30 could be particularly valuable are in windshield marking which can be done for personalization or security reasons.
  • the holographic stamp 34 can be applied on an interior side of the windshield. This stamp 34 can be seen from an outside of the vehicle and it is protected from external environments.
  • a protective and reflective cap can be applied in order to protect the hardened polymer and to enhance the diffractive effect.
  • the mark can range from a simple logo or a serial number up to a more sophisticated 3D or computer generated hologram effect. This last one consists in illuminating the hologram with a specific light source, in order to project a special and unique figure on the dashboard. It is a very discrete but secure authentication system.
  • an official document sealing and authentication can be easily be provided by using the portable holographic marking unit 30.
  • Warranty seals can also be made out of holographic stickers.
  • the stickers can be used to show that original parts have not been opened or separated.
  • the non holographic stickers are often easily removed and then replaced, thus deceiving the warranty seal .
  • With the portable marking unit 30, a small orifice between two pieces can be filled with the liquid polymer. Any attempt for opening and separating two holographic pieces results immediately in the destruction of the holographic seal, with no way to recover it.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Holo Graphy (AREA)

Abstract

La présente invention a trait à une unité de marquage holographique portable destinée à réaliser des marquages holographiques sur un substrat. L'unité comporte une poignée qui constitue un boîtier externe pour l'unité portable et un boîtier interne pour le montage des composants de l'unité. Les composants comprennent une source lumineuse montée à l'intérieur qui est partiellement encapsulée par le boîtier interne et produit de l'éclairage pour l'unité sur le substrat. Un autre composant consiste en une fenêtre de quartz transparente qui, avec le boîtier interne, permet le passage de l'éclairage de la source lumineuse montée à l'intérieur au substrat. En outre, un réflecteur est disposé entre la source lumineuse montée à l'intérieur et le boîtier interne pour la réorientation de l'éclairage en provenance de la source lumineuse à travers la fenêtre et sur le substrat.
PCT/US2003/005039 2002-02-22 2003-02-21 Unite de marquage holographique portable WO2003073173A2 (fr)

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Application Number Priority Date Filing Date Title
AU2003213145A AU2003213145A1 (en) 2002-02-22 2003-02-21 Portable holographic marking unit

Applications Claiming Priority (2)

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US35838002P 2002-02-22 2002-02-22
US60/358,380 2002-02-22

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WO2003073173A3 WO2003073173A3 (fr) 2003-11-20

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US5861113A (en) * 1996-08-01 1999-01-19 The United States Of America As Represented By The Secretary Of Commerce Fabrication of embossed diffractive optics with reusable release agent
US5885514A (en) * 1996-12-09 1999-03-23 Dana Corporation Ambient UVL-curable elastomer mold apparatus
US6068474A (en) * 1998-01-30 2000-05-30 Ivoclar Ag Light curing device
JP2000289037A (ja) * 1999-04-05 2000-10-17 Toshiba Corp 光学部品の成形方法とそれによる光学部品と光ヘッド装置およびそれらの製造方法および光ディスク装置
JP2001138482A (ja) * 1999-11-17 2001-05-22 Fujitsu Ltd 立体構造物転写方法及びその装置

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