EP1490840B1 - Dispositif de verification de caracteristiques de securite - Google Patents

Dispositif de verification de caracteristiques de securite Download PDF

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Publication number
EP1490840B1
EP1490840B1 EP03745731A EP03745731A EP1490840B1 EP 1490840 B1 EP1490840 B1 EP 1490840B1 EP 03745731 A EP03745731 A EP 03745731A EP 03745731 A EP03745731 A EP 03745731A EP 1490840 B1 EP1490840 B1 EP 1490840B1
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EP
European Patent Office
Prior art keywords
light
light source
range
polarization filter
photoluminescent
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.)
Expired - Lifetime
Application number
EP03745731A
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German (de)
English (en)
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EP1490840A2 (fr
Inventor
Klaus Franken
Jakob Grob
Andreas Dostmann
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.)
Landqart AG
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Landqart AG
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Publication date
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Publication of EP1490840A2 publication Critical patent/EP1490840A2/fr
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Anticipated expiration legal-status Critical
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    • 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
    • G07D7/06—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 using wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation
    • G07D7/121—Apparatus characterised by sensor details
    • 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
    • G07D7/06—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 using wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation
    • G07D7/1205—Testing spectral properties

Definitions

  • the present invention relates to an apparatus and a method for visualizing security elements present in an object, which have at least one photoluminescent segment which is characterized by a linearly polarized photoluminescence and / or linearly polarized absorption.
  • Such a security element is z. As described in WO 00/19016.
  • security threads or strips which may be, for example, a metal-coated plastic
  • security papers particularly for use in banknotes and similar securities.
  • these security threads or strips are embedded in the security paper and subsequently printed at most, these security elements can not be easily recognized when the object is viewed in reflection. But they appear as a dark shadow when the object is illuminated and thus observed in transmission.
  • the areas printed with different colors are so small or so close together in this thread that they can not be distinguished by the naked eye and therefore appear to the viewer as a monochrome pattern.
  • the micro-printing and its different colors can be detected by means of a magnifying glass or a microscope.
  • WO 00/19016 in which a security paper or generally safety articles are described, which contain at least one security element having at least one photoluminescent segment, which is characterized by a linearly polarized photoluminescence and / or linearly polarized absorption.
  • linearly polarized excitation light which, for example, by an external light source i. V. m. a linear polarizer can be generated, is absorbed by the segment differently depending on the orientation of the polarization axis of the segment and the polarization direction of the excitation light, which when viewed through the naked eye can lead to a strong light / dark contrast.
  • the object of the invention to provide a method or a device for visualizing security elements present in an object, wherein the security elements to be observed have at least one photoluminescent segment which is characterized by a linearly polarized photoluminescence and / or linearly polarized absorption is.
  • the device is intended to be an easy and reliable detection allow the security elements without having to resort to a complicated and possibly vulnerable construction.
  • the gist of the invention is to send both the incident light and the photoluminescent light from the segment through the same polarizing filter.
  • the contrast of the observation is increased in a surprisingly simple manner and interference signals, which usually occur as a result of stray light or due to unclean polarization, can be efficiently suppressed.
  • the security elements have linearly polarized photoluminescence and linearly polarized absorption.
  • This arrangement is particularly simple and efficient, since in this case the contrast can be particularly increased and only one polarizing filter is required, which is used for both light paths and which in this case has a polarizing effect in both spectral regions (excitation and photoluminescence).
  • the at least one light source emits light in the UV range
  • the photoluminescent light from the at least one segment is in the visible range.
  • Such segments are invisible to the naked eye under normal conditions and have a particularly high security with regard to counterfeiting. Especially for such security features, there is a need for specific and simple verification devices.
  • the light source is a UV light source having an emission in the range of 180 to 500 nanometers, typically in the range of 200 up to 400 nanometers.
  • the original light source does not have to be limited to this frequency range, but it can also be a broadband light source, in front of which a corresponding bandpass filter is arranged, so that only UV light strikes the object, in particular in the stated range.
  • a broadband light source of this band filter in such a way that it also acts as a polarizing filter.
  • the arrangement of 2 filters can be avoided.
  • the light source may be a mercury vapor lamp, a laser light source, or a halogen lamp or an arc discharge lamp.
  • the device is designed such that the observation is effected by a filter which does not allow light to pass substantially in the wavelength range of the light source, while light in the wavelength range of the light photoluminescent from the segment can pass substantially unhindered. Since irradiated in the UV region and observed in the visible region, an additional filter should be used for observation, which has substantially no transmission in the UV region, while it is transparent to the visible region. In this way, stray light from the light sources (direct stray light or reflected stray light from housing parts or from the object with the security feature) can be efficiently suppressed and the verification of the security features is improved or improved. be simplified.
  • the polarization filter for observation about an axis perpendicular to the plane of the polarizing filter can be rotated in particular by means of a motor.
  • the rotation of the polarizing filter results in an intense light / dark effect of the segments (bright when the directions of polarization are parallel, dark when the directions of polarization are perpendicular to each other) during observation, which makes the security features particularly prominent with respect to the environment.
  • the rotation of the polarizing filter can be technically realized by the polarization filter is enclosed in a mounting ring, wherein the polarizing filter is rotated via a running around the socket ring, driven by a motor driven drive belt drive belt, and wherein particularly preferably the socket ring over at least three, tangentially engaging guide rollers is rotatably mounted.
  • a round polarizing filter can be used, in which case the radiation to some extent from obliquely above laterally through several light sources through the polarizing filter, and the observation of the reflected light through the central region of the polarizing filter can be made vertically upward. This simple observation through the center of the polarizing filter is not possible if the polarizing filter is rotatably supported by a central axis.
  • a camera especially a CCD color camera, is provided for observation, wherein the image taken by the camera, optionally after appropriate image processing such as contrast adjustment, color matching, brightness adjustment, enlargement and / or resolution adjustment, on a display , particularly preferably a TFT-LCD color display is mapped.
  • image processing such as contrast adjustment, color matching, brightness adjustment, enlargement and / or resolution adjustment
  • a display particularly preferably a TFT-LCD color display is mapped.
  • Image editing Security features can be detected even better on a corresponding display.
  • the camera may preferably be a multi-chip camera, in particular a Dreichip camera.
  • the resolution and thus the quality of the verification of the security feature can be increased by such high-level camera types.
  • the light source is a UV lamp, preferably a UV tube having a wavelength in the range of about 200 to about 390 nanometers, more preferably having a wavelength in the range of about 350 to about 370 nanometers (each the maxima of the emission bands), and that the polarization filter is a broadband linear polarizer which is particularly preferably polarizing in a wavelength range of 300 to 770 nanometers.
  • the polarization filter is a broadband linear polarizer which is particularly preferably polarizing in a wavelength range of 300 to 770 nanometers.
  • mercury vapor UV tubes optionally coated with phosphorus to push the center of the emitted line into the desired range (eg, 370 nanometers).
  • this filter In order for the polarizing filter to have a linear polarizing effect both in the excitation region and in the observation region, this filter should either have a broadband characteristic or be permeable and polarizing at least in the observation region and in the region of the irradiated UV line. It is important to adjust the characteristic of the UV tube to the characteristic of the polarizing filter (or vice versa), d. H. Care must be taken to ensure that the polarization filter achieves efficient linear polarization both in the range of observation (eg in the visible range) and in the UV range of the radiation, and losses in these spectral ranges are kept low.
  • a further improvement of the device according to the invention can be obtained by additionally providing the device with other other security features.
  • the further security features may include magnetic, electrical, optical, electronic, electro-optical features, for example selected from the group barcodes, magnetic stripes, conductivity, electroluminescence, photoluminescence, up-conversion (anti-stokes), infrared signatures, electronically readable texts ( OCR font) also with infrared writing, X-ray fluorescence characteristics, etc. act.
  • Fig. 1 a shows a perspective view of a handset 20 with electronic display, which is to serve as a first embodiment of the present invention.
  • the handset 20 has a housing upper part 8 and a housing lower part 10, which are screwed on each other and which both have an oval cross-section.
  • a TFT-LCD color display 7 is arranged, on which the object 4 to be examined is imaged.
  • the handset 20 has at the end of the main axis (the ellipse) at half height on grip notches 19, which make the device easier to handle.
  • ventilation slots 12 are arranged immediately below these notches 19 in order to allow the heat generated in the device to escape.
  • the device has a height of 13.5 cm, a length along the major axis of 23.3 cm and a width along the minor axis of 15.4 cm. The total weight is less than 10 kg.
  • the device has on the top 18 via two switches 11, wherein one of the switches is provided for switching on the lamps, and the other switch for switching on the motor for the rotation of the polarizing filter 2.
  • the device has three rotary control 13 in the upper part of long side. These knobs 13 make it possible to adjust the brightness, the contrast and the color sensitivity of the display 7 according to the needs.
  • connection sockets 14, 15 and 16 are also provided in the region of the longitudinal side. One of these sockets serves as a connector 14 for an external display. In other words, the output of the CCD camera 6 arranged in the interior can be led to another display via this connection socket.
  • two terminals 15 and 16 are provided, one of which serves to connect a battery charger.
  • the power supply of the device in autonomous operation is ensured by accumulators arranged inside the housing, which can be charged via this connection 16.
  • the second plug 15 can be used to connect an external 12 volt supply if either the accumulators are empty or in principle a stationary operation is intended.
  • Fig. 1b shows a central section along the minor axis of the ellipsoidal device, which is to serve the schematic representation of the operation.
  • the device has two UV lamps 1, which are arranged laterally in the housing upper part 8 parallel to the main axis. These are lamps whose emission characteristics have a maximum in the range from 365 to 370 nm (UVA, eg mercury vapor lamps with corresponding Phosphor coating or UV LEDs).
  • UVA eg mercury vapor lamps with corresponding Phosphor coating or UV LEDs.
  • the light 24 emanating from these lamps passes through a centrally arranged polarizing filter 2, in order then to impinge as a linearly polarized light 23 on the object 4 to be examined with security feature.
  • security features can be observed, which have a photoluminescence from the UV region in the visible range, and in which either absorption and / or emission are linearly polarized. It can be a variety of objects, such. As banknotes, certificates, tickets, access rights, stamps, ID cards, packaging, identity cards, passports, etc., in general to documents whose fake security should be ensured by appropriate photoluminescent security features with polarizing properties.
  • the object 4 is covered for viewing by the device resp. covered, and observed through a specially designated hole 27 in the bottom.
  • the lower housing part has over the hole 27 via a dark room 22 a height of about 5.5 cm, which is sealed to the interior 21 in the housing upper part 8 by a cover glass 3.
  • the cover glass 3 is intended to prevent that the cavity 21, in which optical and electronic devices are located, can not be contaminated.
  • the light emitted by the object 4 in the visible range usually also polarized light 25, which may have a variety of colors according to the security features, then passes up through the same polarizing filter 2 on a CCD camera 6.
  • This CCD camera 6 also has a filter. 5 which eliminates electromagnetic radiation in the frequency range of the light sources 1 from the light entering the camera.
  • the CCD camera is a UV filter, which direct light of the UV lamps 1, UV scattered light, or of Housing parts or the object 4 reflected UV light does not enter the CCD camera 6.
  • the CCD camera is connected to a TFT-LCD color display 7 on which the security features of the object 4 are imaged.
  • the data determined by the CCD camera 6 can optionally be subjected to an adapted image processing, which makes the security features stand out.
  • the polarizing filter 2 can be rotated in this device for observation. As a result, a characteristic light / dark effect can be observed during observation.
  • the bright / dark effect is achieved by the fact that when the polarization direction of the polarizing filter 2 and the polarization direction of the polarizing segment of the security feature are aligned parallel to each other, a bright reflection appears on the display, while in orthogonal alignment no reflection can be observed.
  • the observation by the same polarization filter leads to an increased visibility of this light / dark effect, since it automatically ensures optimum coordination or adaptation of the polarization direction of irradiation and observation.
  • the polarization filter is a broadband polarization filter, i. H. a carrier that efficiently polarizes light in the range of about 300 to about 770 nanometers.
  • UV polarizers such as those available from 3M or marketed by Polaroid under the name HNP'B linear ultraviolet * (275-750 nm as the passband or polarization region, respectively).
  • Fig. 1c shows a side view of the device. It can be seen in particular how the lower housing part 10 is fastened via fastening screws 26 on the housing upper part 8.
  • Fig. 1d shows a view according to AA in Fig. 1c), ie a view into the housing upper part 8 from below.
  • AA in Fig. 1c a view into the housing upper part 8 from below.
  • the specific arrangement of the light sources 1 with their socket 29, in which the head parts 28 of the light sources 1 are inserted the arrangement of the rotary control 13 in the housing upper part 8, as well as the switch 11 can be seen.
  • Fig. 1e shows a view according to B-B in Fig. 1c), d. H. a view of the housing lower part 10 from above. It can be seen how the polarizing filter 2 is rotatably mounted on the lower part 10.
  • the polarizing filter 2 is enclosed in a mounting ring 30.
  • the mounting ring 30 has on its outer edge an incision in which a drive belt 31 extends.
  • This rubber drive belt 31 is stretched around the socket ring 30 by means of a drive wheel 33.
  • the drive wheel 33 is driven by a mounted on the housing base 10, projecting into the housing upper part 8 motor, whereby the polarizing filter 2 can be rotated.
  • the polarizing filter 2 is mounted on three freely rotatable guide rollers 34, which also engage from the outside in specifically provided, V-shaped flanks of the mounting ring 30. This guidance of the polarizing filter 2 from the outside makes it possible to guide the observation centrally through the center of the filter.
  • Fig. 2 shows a further embodiment of the present invention, in which the observation is not realized electronically.
  • the section shown in Fig. 2 corresponds substantially to the section according to FIG. 1 b) but here no display 7 is present, but simply upwards a disc 36 is arranged, which prevents fouling of the interior 21 of the housing upper part 8 ,
  • specific diaphragms 35 are provided here, which prevent light from falling directly from the light sources 1 onto the observation disc 36.
  • In the aperture 35 may be parallel to the axis of the light sources 1 extending planar sheets, but it is also possible, for. B.
  • the diaphragm in the form of a conical truncated cone.
  • a filter 5 is provided which filters out light components from the spectral range of the light sources 1 (UV filter). It is also possible, if a sufficiently efficient UV filter 5 is used to completely dispense with aperture 35, and to put the filter 5 immediately in front of the disc 36, or replace the disc 36 directly by a filter 5.
  • the object with corresponding security features is now simply placed on a plane, and a device according to one of the FIGS. 1 and 2 is guided over the object such that the object is covered by the hole 27. It should be ensured that no light can get laterally between the object and the bottom of the housing in the interior 22, and thus can reduce the quality of the observation.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Burglar Alarm Systems (AREA)
  • Studio Devices (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Claims (18)

  1. Dispositif (20) pour rendre visible les éléments de sécurité présents dans un objet (4), lesquels présentent au moins un segment photoluminescent qui est caractérisé par une photoluminescence à polarisation linéaire et/ou une absorption à polarisation linéaire, au moins une source de lumière (1) émettant de la lumière dans la gamme des UV et l'au moins une source de lumière (1) ainsi qu'au moins un filtre polarisant (2) étant disposés de telle sorte que la lumière (24) de la source de lumière (1) soit polarisée de manière linéaire (23) par un filtre polarisant (2), vienne heurter l'objet (4) ou les segments photoluminescents qui y sont présents et la lumière (25) produite par photoluminescence par le segment puisse être observée à travers le même filtre polarisant (2) et que la lumière (25) produite par photoluminescence par au moins un segment se trouve dans la plage visible.
  2. Dispositif (20) selon la revendication 1, caractérisé en ce que la source de lumière est une source de lumière UV (1) ayant une émission dans la plage de 180 à 500 nanomètres, de préférence dans la plage de 200 à 400 nanomètres.
  3. Dispositif (20) selon la revendication 1, caractérisé en ce que la source de lumière est une source de lumière à large bande devant laquelle est disposé un filtre passe-bande correspondant de sorte que seule la lumière UV vienne heurter l'objet (4), notamment dans la plage de 180 à 500 nanomètres, de préférence dans la plage de 200 à 400 nanomètres.
  4. Dispositif (20) selon la revendication 3, caractérisé en ce que le filtre passe-bande fait aussi en même temps office de filtre polarisant (2).
  5. Dispositif (20) selon l'une des revendications 2, 3 ou 4, caractérisé en ce que la source de lumière est une lampe à vapeurs de mercure, une source de lumière laser ou une lampe halogène ou encore une lampe à décharge en arc.
  6. Dispositif (20) selon l'une des revendications précédentes, caractérisé en ce que l'observation a lieu à travers un filtre (5) qui ne laisse pas passer l'essentiel de la lumière dans la plage de longueurs d'onde de la source de lumière (1), alors que la lumière dans la plage de longueurs d'onde de la lumière (25) produite par photoluminescence par le segment peut passer pour l'essentiel sans entrave.
  7. Dispositif (20) selon l'une des revendications précédentes, caractérisé en ce que la lumière incidente (24) et la lumière (25) produite par photoluminescence par le segment passent à travers le même filtre polarisant (2) et que le filtre polarisant (2) peut, pour l'observation, être mis en rotation autour d'un axe perpendiculairement au plan du filtre polarisant (2), notamment à l'aide d'un moteur (32).
  8. Dispositif (20) selon la revendication 7, caractérisé en ce que le filtre polarisant (2) peut tourner à l'aide d'un moteur (32) avec une fréquence de rotation dans la plage de 0,2 à 5 Hz, notamment de préférence avec une fréquence de rotation dans la plage de 0,5 à 2 Hz.
  9. Dispositif (20) selon l'une des revendications 7 ou 8, caractérisé en ce que le filtre polarisant (2) est monté dans une monture annulaire (30) et que le filtre polarisant (2) est mis en rotation par le biais d'une courroie d'entraînement (31) entraînée par une roue d'entraînement (33) qui tourne autour de la monture annulaire (30) et qui est mise en mouvement par un moteur (32), la monture annulaire (30) étant particulièrement préférablement logée de manière à pouvoir tourner sur au moins trois galets de guidage (34) en prise tangentielle.
  10. Dispositif (20) selon l'une des revendications précédentes, caractérisé en ce qu'une caméra, particulièrement préférablement une caméra couleur CCD (6), est prévue pour l'observation et que l'image enregistrée par la caméra, le cas échéant après un traitement approprié de l'image tel que l'adaptation du contraste, l'adaptation des couleurs, l'adaptation de la luminosité, un grossissement et/ou une adaptation de la résolution, est représentée sur un écran, notamment de préférence sur un écran couleur LCD TFT (7).
  11. Dispositif (20) selon la revendication 10, caractérisé en ce que la caméra est une caméra à plusieurs puces, notamment de préférence une caméra à trois puces.
  12. Dispositif (20) selon l'une des revendications précédentes, caractérisé en ce que l'observation a lieu à travers une lentille (36), notamment de préférence à travers un verre grossissant.
  13. Dispositif (20) selon l'une des revendications 1, 2 ou 5 à 12, caractérisé en ce que la source de lumière (1) est une lampe à UV, de préférence un tube à UV avec une longueur d'onde dans la plage de 200 à 390 nanomètres, et que le filtre polarisant (2) est un polariseur linéaire à large bande dont l'effet polarisant intervient notamment de préférence dans une plage de longueurs d'onde de 300 à 770 nanomètres.
  14. Dispositif (20) selon la revendication 13, caractérisé en ce que la source de lumière (1) est un tube à UV avec une longueur d'onde dans la plage de 350 à 370 nanomètres.
  15. Dispositif (20) selon l'une des revendications précédentes, caractérisé en ce que des moyens supplémentaires sont installés pour la vérification d'autres caractéristiques de sécurité, les autres caractéristiques de sécurité étant notamment de préférence des caractéristiques magnétiques, électriques, optiques, électroniques, électro-optiques.
  16. Dispositif (20) selon la revendication 15, caractérisé en ce que les autres caractéristiques de sécurité sont choisies dans le groupes des codes à barres, bandes magnétiques, conductivité, électroluminescence, photoluminescence, élévation (anti-stokes), signatures infrarouges, textes lisibles électroniquement (écriture OCR) aussi avec une écriture infrarouge, caractéristiques de fluorescence X.
  17. Procédé pour rendre visible les éléments de sécurité présents dans un objet (4), lesquels présentent au moins un segment photoluminescent qui est caractérisé par une photoluminescence à polarisation linéaire et/ou une absorption à polarisation linéaire, la lumière (24) dans la gamme des UV d'au moins une source de lumière (1) étant polarisée de manière linéaire (23) par au moins un filtre polarisant (2), venant heurter l'objet (4) ou les segments photoluminescents qui y sont présents et la lumière (25) produite par photoluminescence par le segment dans la plage visible pouvant être observée à travers le même filtre polarisant (2).
  18. Procédé selon la revendication 17, caractérisé en ce qu'un dispositif selon l'une des revendications 1 à 16 est utilisé.
EP03745731A 2002-04-04 2003-03-25 Dispositif de verification de caracteristiques de securite Expired - Lifetime EP1490840B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH5712002 2002-04-04
CH5712002 2002-04-04
PCT/CH2003/000191 WO2003085609A2 (fr) 2002-04-04 2003-03-25 Dispositif de verification de caracteristiques de securite

Publications (2)

Publication Number Publication Date
EP1490840A2 EP1490840A2 (fr) 2004-12-29
EP1490840B1 true EP1490840B1 (fr) 2007-01-17

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US (1) US20050213078A1 (fr)
EP (1) EP1490840B1 (fr)
AT (1) ATE352077T1 (fr)
AU (1) AU2003209915B8 (fr)
CA (1) CA2481118A1 (fr)
DE (1) DE50306308D1 (fr)
WO (1) WO2003085609A2 (fr)

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EP3503049B1 (fr) * 2017-12-22 2021-02-24 CI Tech Sensors AG Dispositif et procédé de détection d'une caractéristique de sécurité lisible par machine d'un document de valeur

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EP0889350A1 (fr) * 1997-07-03 1999-01-07 ETHZ Institut für Polymere Dispositifs d'affichage photoluminescents
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JP4336008B2 (ja) * 1998-11-17 2009-09-30 日本発條株式会社 対象物の識別構造及び識別方法
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JP2002127647A (ja) * 2000-10-19 2002-05-08 Nhk Spring Co Ltd 対象物の識別媒体及びその製造方法

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US20050213078A1 (en) 2005-09-29
DE50306308D1 (de) 2007-03-08
CA2481118A1 (fr) 2003-10-16
AU2003209915B8 (en) 2008-09-18
AU2003209915B2 (en) 2008-07-17
WO2003085609A3 (fr) 2004-02-26
EP1490840A2 (fr) 2004-12-29
ATE352077T1 (de) 2007-02-15
AU2003209915A1 (en) 2003-10-20
WO2003085609A2 (fr) 2003-10-16

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