WO2000055604A1 - Method for visually testing opacity of scratch-off tiles and implementing device - Google Patents

Method for visually testing opacity of scratch-off tiles and implementing device Download PDF

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Publication number
WO2000055604A1
WO2000055604A1 PCT/FR2000/000548 FR0000548W WO0055604A1 WO 2000055604 A1 WO2000055604 A1 WO 2000055604A1 FR 0000548 W FR0000548 W FR 0000548W WO 0055604 A1 WO0055604 A1 WO 0055604A1
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WO
WIPO (PCT)
Prior art keywords
optical
support
bands
sub
test
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PCT/FR2000/000548
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French (fr)
Inventor
Cyrille Mouillor
Rémy-Antoine CONTI
Original Assignee
Gemplus
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Publication date
Application filed by Gemplus filed Critical Gemplus
Priority to AU31720/00A priority Critical patent/AU3172000A/en
Publication of WO2000055604A1 publication Critical patent/WO2000055604A1/en

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/59Transmissivity
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84Systems specially adapted for particular applications
    • G01N21/88Investigating the presence of flaws or contamination
    • G01N21/8803Visual inspection
    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63FCARD, BOARD, OR ROULETTE GAMES; INDOOR GAMES USING SMALL MOVING PLAYING BODIES; VIDEO GAMES; GAMES NOT OTHERWISE PROVIDED FOR
    • A63F3/00Board games; Raffle games
    • A63F3/06Lottos or bingo games; Systems, apparatus or devices for checking such games
    • A63F3/065Tickets or accessories for use therewith
    • A63F3/0665Tickets or accessories for use therewith having a message becoming legible after rubbing-off a coating or removing an adhesive layer

Definitions

  • the invention relates to a method for visually testing the opacity of scrapable blocks masking information written on a medium and a device for implementing the method.
  • scratchable pad any pattern placed or printed on a support in order to be removed by simple scraping with a nail or any object of sufficient hardness, the objective of the holder of the support generally being to discover an inscription or a printed design under said pavement.
  • Such blocks are generally produced by screen printing technologies or by thermal transfer, or hot pressing.
  • the applicant has very recently implemented a technology for depositing scrapable pavers using the ink jet printing technique.
  • the scratchable pad hides information which must remain secret from the public, this information being intended for the user of the card, it will for example be a useful number for the card holder.
  • the supports on which this paver is produced may be paper supports, or cardboard supports, but also on PVC plastic supports, also propylene / paper or PET supports.
  • the support generally comprises three superimposed sheets glued together, the middle sheet of which is to say the heart, may be made of paper, the other two possibly being of polypropylene PP, or else the heart may be made of polyethylene PET, the other two being made of PVC (polyethylene vinyl), or else the core may be made of PET and the other two sheets being made of PETG.
  • the masked information written on the support can be a decorative motif in applications such as games, it can also be, as we have just said, a piece of data which must remain secret, for example a number.
  • the information entered hidden by the removable pad can be produced by inkjet printing or any other printing technique suitable for the medium on which it is produced. In all cases, it is necessary, even imperative, to ensure security with regard to this information. This must remain secret and therefore must in no case be able to be read through the removable pad.
  • the subject of the invention is a method making it possible to remedy this problem.
  • the subject of the invention is more particularly a method of visually testing the opacity of a scrapable pad masking information written on a support, mainly characterized in that it consists in successively illuminating the scrapable pad through the support at means of optical rays belonging to sub-bands of the wavelength band of the visible spectrum.
  • a decomposition into sub-bands is carried out of the wavelength band of the visible domain emitted by an optical source whose spectrum covers this band.
  • provision is made to select four sub-bands capable of partially overlapping.
  • the sub-bands selected are from 250 to 500 nanometers, 370 to 480 nanometers, 480 to 580 nanometers and 580 to 780 nanometers.
  • the optical rays emitted by the source are guided by an optical fiber.
  • cooling takes place during the transport of the spokes optics so as not to degrade the support and / or the packaging of the support.
  • Another object of the invention relates to a device for visual test of opacity of scrapable blocks masking information written on a support, mainly characterized in that it comprises an optical source having a spectrum covering the band of the wavelengths of the visible associated with a plurality of optical filters making it possible to decompose said band into sub-bands.
  • the device comprises a chamber for cooling the source of optical rays.
  • the device comprises an optical fiber for guiding the optical rays illuminating the block 6 through the support.
  • the core of the optical fiber contains a cooling product.
  • optical filters are capable of being associated in pairs, to obtain a decomposition of the visible wavelength band into four sub-bands.
  • FIG. 1 represents the diagram of a device for implementing the method
  • FIG. 2 represents the emission spectrum of the optical source used
  • FIG. 3 represents the bandwidth of the optical filters used to perform the decomposition into sub-bands of the spectrum of the optical source.
  • the method of the invention applies to any type of support as stated above. It makes it possible to verify and ensure in complete safety that the removable pad made on such supports does not make it possible to read the information hidden or masked by this pad.
  • To operate this visual test it is proposed to illuminate the scrapable pad 6 placed on a support 5, through this support by means of optical rays belonging to sub-bands of the band of the wavelengths of the visible spectrum.
  • An exemplary embodiment of a test device 10 making it possible to implement the method is illustrated by the diagram in FIG. 1.
  • the device comprises an optical source 1, the radiation spectrum of which covers the wavelength band of the visible range.
  • This test device 10 further comprises optical filters 3 making it possible to carry out the decomposition of the band of the wavelengths of the visible domain into sub-bands thus making it possible to carry out the test in the different sub-bands thus obtained.
  • the test device 10 will preferably include a cooling chamber 2, placed at the outlet of the source 1, so as to cool the source so as not to degrade the support 5 by the heat of this source. This arrangement also makes it possible to test supports placed under plastic or cellophane packaging without there being any risk of degradation of this packaging.
  • the test device 10 further comprises an optical fiber 4 for guiding the rays emitted by the source 1 to the support 5.
  • the fiber makes it possible to channel these rays in order to apply them more precisely in the zone where the block 6 is located through the support 5.
  • the fiber is also cooled for any risk of deterioration by the heat of the support 5.
  • the optical source is a xenon lamp which has a spectrum of 250 to 2,500 nanometers as illustrated in the diagram in Figure 2.
  • the filtering device 3 allows the spectrum of visible wavelengths to be broken down into four sub-bands, each corresponding to the primary colors.
  • the test therefore consists in visually verifying, under the lighting of the light beam emitted by the lamp 7, that the information, for example the number written under the removable pad, is not legible.
  • the operation is carried out for each of the sub-bands as well as for the global spectrum.
  • the test is carried out at a fixed beam power of 170 m per cm 2 '
  • the test is therefore preferably carried out in a dark room.
  • the optical fiber 4 used is a coolant fiber with a core diameter of 5 mm.
  • the liquid is in the core 8 of the fiber and makes it possible to obtain further cooling during the transport of the optical rays to the support 5.
  • the xenon lamp is a 150 W ozone-free lamp.
  • a set of optical filters is used having characteristics which allow them to obtain bandpass filtering in the four bands mentioned below:.
  • a first band analyzed is the band corresponding to purple which is between 250 and 500 nanometers.
  • a filter is placed in the filter holder 7 having this bandwidth. This corresponds to the bandwidth marked with the reference A in the diagram in Figure 3..
  • the band between 370 and 480 nanometers, which corresponds to the passband B in FIG. 3, is then analyzed.
  • two filters are inserted, one being the filter corresponding to purple and the other being a transparent filter,.
  • the band 480 and 580 nanometers which corresponds to the pass band carrying the reference C in FIG. 3, is then analyzed.
  • filters corresponding to blue and yellow are inserted into the filter holder 7.
  • filters corresponding to blue and yellow are inserted into the filter holder 7.

Abstract

The invention concerns a method and a device for visually testing the opacity of scratch-off tiles (6) masking an information inscribed on the medium (5). The invention is characterised in that the method consists in successively illuminating the scratch-off tile using optical rays pertaining to sub-bands of the visible spectrum wavelength band. The invention is particularly applicable to smart cards.

Description

PROCEDE DE TEST VISUEL D'OPACITE DE PAVES GRATTABLES ET DISPOSITIF DE MISE EN OEUVREMETHOD FOR VISUAL TESTING OF OPACITY OF FREE PAVERS AND DEVICE FOR IMPLEMENTING IT
L'invention concerne un procédé de test visuel d'opacité de pavés grattables masquant une information inscrite sur un support et un dispositif de mise en œuvre du procédé . On entend par pavé grattable tout motif disposé ou imprimé sur un support dans le but d'être ôté par simple grattage avec un ongle ou tout objet de dureté suffisante, l'objectif du détenteur du support étant généralement de découvrir une inscription ou un dessin imprimé sous ledit pavé .The invention relates to a method for visually testing the opacity of scrapable blocks masking information written on a medium and a device for implementing the method. By scratchable pad is meant any pattern placed or printed on a support in order to be removed by simple scraping with a nail or any object of sufficient hardness, the objective of the holder of the support generally being to discover an inscription or a printed design under said pavement.
De tels pavés sont généralement réalisés par des technologies d'impression par sérigraphie ou par transfert thermique, ou pression à chaud.Such blocks are generally produced by screen printing technologies or by thermal transfer, or hot pressing.
Le déposant a mis en oeuvre très récemment une technologie de dépôt de pavés grattables utilisant la technique d'impression par jet d'encre.The applicant has very recently implemented a technology for depositing scrapable pavers using the ink jet printing technique.
Les applications de la réalisation de pavés grattables sont multiples .The applications of making scrapable pavers are multiple.
On peut citer en particulier le domaine des jeux tels que les loteries, les billets jetables.We can cite in particular the field of games such as lotteries, disposable tickets.
On s'oriente également vers des utilisations autres telles que par exemple des applications pour lesquelles les supports sont des supports de mémorisation, notamment des cartes à puce (cartes à puce bancaires et/ou porte-monnaie électronique et/ou cartes à puce téléphoniques. Dans ce cas, le pavé grattable masque une information qui doit rester secrète par rapport au public, cette information étant destinée à l'utilisateur de la carte, il s'agira par exemple d'un numéro utile pour le détenteur de la carte.We are also moving towards other uses such as, for example, applications for which the media are storage media, in particular smart cards (bank smart cards and / or electronic purses and / or telephone smart cards. In this case, the scratchable pad hides information which must remain secret from the public, this information being intended for the user of the card, it will for example be a useful number for the card holder.
Selon le type d'application envisagé pour le pavé grattable, les supports sur lesquels ce pavé est réalisé pourront être des supports papier, ou des supports carton, mais aussi bien sur des supports plastiques PVC, également des supports en propylène/papier ou en PET. Dans le cas de supports de mémorisation, le support comporte en général trois feuillets superposés collés dont le feuillet médian, c'est-à-dire le cœur, peut être en papier les deux autres pouvant être en polypropylène PP, ou bien alors le cœur peut être en polyéthylène PET, les deux autres étant en PVC (polyéthylène de vinyle) , ou bien encore le cœur peut être en PET et les deux autres feuillets étant en PETG . On peut avoir également des supports papier constitués par plusieurs feuilles pré-enduites et collées entre-elles ou laminées à chaud.Depending on the type of application envisaged for the scrapable paver, the supports on which this paver is produced may be paper supports, or cardboard supports, but also on PVC plastic supports, also propylene / paper or PET supports. . In the case of storage media, the support generally comprises three superimposed sheets glued together, the middle sheet of which is to say the heart, may be made of paper, the other two possibly being of polypropylene PP, or else the heart may be made of polyethylene PET, the other two being made of PVC (polyethylene vinyl), or else the core may be made of PET and the other two sheets being made of PETG. One can also have paper supports constituted by several pre-coated sheets and glued together or hot-rolled.
L' information masquée inscrite sur le support peut être un motif décoratif dans des applications telles que les jeux, cela peut être également, comme on vient de le dire, une donnée qui doit rester secrète, par exemple un numéro.The masked information written on the support can be a decorative motif in applications such as games, it can also be, as we have just said, a piece of data which must remain secret, for example a number.
L' information inscrite cachée par le pavé grattable peut être réalisée par impression par jet d'encre ou toute autre technique d'impression convenant au support sur lequel elle est réalisée. Dans tous les cas il est nécessaire, voire même impératif, d'assurer une sécurité par rapport à cette information. Celle-ci doit rester secrète et par conséquent, ne doit en aucun cas pouvoir être lue à travers le pavé grattable .The information entered hidden by the removable pad can be produced by inkjet printing or any other printing technique suitable for the medium on which it is produced. In all cases, it is necessary, even imperative, to ensure security with regard to this information. This must remain secret and therefore must in no case be able to be read through the removable pad.
L'invention a pour objet un procédé permettant de remédier à ce problème .The subject of the invention is a method making it possible to remedy this problem.
A cette fin, l'invention a plus particulièrement pour objet un procédé de test visuel d'opacité de pavé grattable masquant une information inscrite sur un support, principalement caractérisé en ce qu'il consiste à éclairer successivement le pavé grattable à travers le support au moyen de rayons optiques appartenant à des sous-bandes de la bande des longueurs d'ondes du spectre visible.To this end, the subject of the invention is more particularly a method of visually testing the opacity of a scrapable pad masking information written on a support, mainly characterized in that it consists in successively illuminating the scrapable pad through the support at means of optical rays belonging to sub-bands of the wavelength band of the visible spectrum.
Selon une autre caractéristique, pour éclairer successivement le pavé grattable on réalise une décomposition en sous -bandes, de la bande de longueurs d'ondes du domaine visible émise par une source optique dont le spectre couvre cette bande.According to another characteristic, to successively illuminate the scrapable pad, a decomposition into sub-bands is carried out of the wavelength band of the visible domain emitted by an optical source whose spectrum covers this band.
Selon un mode de réalisation, il est prévu de sélectionner quatre sous-bandes susceptibles de se recouvrir partiellement.According to one embodiment, provision is made to select four sub-bands capable of partially overlapping.
De préférence, les sous-bandes sélectionnées sont de 250 à 500 nanomètres, 370 à 480 nanomètres, 480 à 580 nanomètres et 580 à 780 nanomètres.Preferably, the sub-bands selected are from 250 to 500 nanometers, 370 to 480 nanometers, 480 to 580 nanometers and 580 to 780 nanometers.
Selon une autre caractéristique, les rayons optiques émis par la source sont guidés par une fibre optique . Selon une autre caractéristique, on opère un refroidissement pendant le transport des rayons optiques afin de ne pas dégrader le support et/ou 1 ' emballage du support .According to another characteristic, the optical rays emitted by the source are guided by an optical fiber. According to another characteristic, cooling takes place during the transport of the spokes optics so as not to degrade the support and / or the packaging of the support.
A cette fin, on refroidit la fibre optique. En outre, on refroidit la source optique. Un autre objet de l'invention concerne un dispositif de test visuel d'opacité de pavés grattables masquant une information inscrite sur un support, principalement caractérisé en ce qu'il comprend une source optique ayant un spectre couvrant la bande des longueurs d'ondes du visible associée à une pluralité de filtres optiques permettant de décomposer ladite bande en sous-bandes.To this end, the optical fiber is cooled. In addition, the optical source is cooled. Another object of the invention relates to a device for visual test of opacity of scrapable blocks masking information written on a support, mainly characterized in that it comprises an optical source having a spectrum covering the band of the wavelengths of the visible associated with a plurality of optical filters making it possible to decompose said band into sub-bands.
Selon une autre caractéristique, le dispositif comporte une chambre de refroidissement de la source de rayons optiques .According to another characteristic, the device comprises a chamber for cooling the source of optical rays.
Selon une autre caractéristique, le dispositif comporte une fibre optique pour guider les rayons optiques éclairant le pavé 6 à travers le support.According to another characteristic, the device comprises an optical fiber for guiding the optical rays illuminating the block 6 through the support.
Avantageusement, le cœur de la fibre optique contient un produit de refroidissement.Advantageously, the core of the optical fiber contains a cooling product.
Selon un mode de réalisation, des filtres optiques sont susceptibles d'être associés deux à deux, pour obtenir une décomposition de la bande des longueurs d'ondes du visible en quatre sous-bandes.According to one embodiment, optical filters are capable of being associated in pairs, to obtain a decomposition of the visible wavelength band into four sub-bands.
D'autres particularités et avantages de l'invention apparaîtront clairement à la lecture de la description qui est faite ci -après et qui est donnée à titre illustratif et non limitatif en regard des figures sur lesquelles : la figure 1, représente le schéma d'un dispositif de mise en œuvre du procédé, la figure 2, représente le spectre d'émission de la source optique utilisée, - la figure 3, représente la bande passante des filtres optiques utilisés pour réaliser la décomposition en sous-bandes du spectre de la source optique.Other particularities and advantages of the invention will appear clearly on reading the description which is given below and which is given by way of illustration and not limitation with regard to the figures in which: FIG. 1 represents the diagram of a device for implementing the method, FIG. 2 represents the emission spectrum of the optical source used, FIG. 3 represents the bandwidth of the optical filters used to perform the decomposition into sub-bands of the spectrum of the optical source.
Le procédé de l'invention s'applique à tout type de support tel qu'énoncé précédemment. Il permet de vérifier et d'assurer en toute sécurité que le pavé grattable réalisé sur de tels supports ne permet pas de lire l'information cachée ou masquée par ce pavé. Pour opérer ce test visuel il est proposé d'éclairer le pavé grattable 6 placé sur un support 5, à travers ce support au moyen de rayons optiques appartenant à des sous-bandes de la bande des longueurs d'ondes du spectre visible. Un exemple de réalisation d'un dispositif de test 10 permettant de mettre en œuvre le procédé est illustré par le schéma de la figure 1.The method of the invention applies to any type of support as stated above. It makes it possible to verify and ensure in complete safety that the removable pad made on such supports does not make it possible to read the information hidden or masked by this pad. To operate this visual test, it is proposed to illuminate the scrapable pad 6 placed on a support 5, through this support by means of optical rays belonging to sub-bands of the band of the wavelengths of the visible spectrum. An exemplary embodiment of a test device 10 making it possible to implement the method is illustrated by the diagram in FIG. 1.
Dans cet exemple de réalisation le dispositif comporte une source optique 1 dont le spectre de rayonnement couvre la bande des longueurs d'ondes du domaine visible.In this exemplary embodiment, the device comprises an optical source 1, the radiation spectrum of which covers the wavelength band of the visible range.
Ce spectre est illustré par le schéma de la figure 2.This spectrum is illustrated by the diagram in FIG. 2.
Ce dispositif de test 10 comporte en outre des filtres optiques 3 permettant de réaliser la décomposition de la bande des longueurs d'ondes du domaine visible en sous-bandes permettant ainsi de procéder au test dans les différentes sous-bandes ainsi obtenues . Le dispositif de test 10 comportera de préférence une chambre de refroidissement 2, placée à la sortie de la source 1, de manière à refroidir la source afin de ne pas dégrader le support 5 par la chaleur de cette source . Cette disposition permet en outre de tester des supports mis sous un emballage plastique ou cellophane sans qu'il y ait de risque de dégradation de cet emballage .This test device 10 further comprises optical filters 3 making it possible to carry out the decomposition of the band of the wavelengths of the visible domain into sub-bands thus making it possible to carry out the test in the different sub-bands thus obtained. The test device 10 will preferably include a cooling chamber 2, placed at the outlet of the source 1, so as to cool the source so as not to degrade the support 5 by the heat of this source. This arrangement also makes it possible to test supports placed under plastic or cellophane packaging without there being any risk of degradation of this packaging.
Le dispositif de test 10 comporte en outre une fibre optique 4 de guidage des rayons émis -par la source 1 jusqu'au support 5.The test device 10 further comprises an optical fiber 4 for guiding the rays emitted by the source 1 to the support 5.
La fibre permet de canaliser ces rayons pour les appliquer plus précisément dans la zone où se situe le pavé 6 à travers le support 5. La fibre est également refroidie pour tout risque de détérioration par la chaleur du support 5.The fiber makes it possible to channel these rays in order to apply them more precisely in the zone where the block 6 is located through the support 5. The fiber is also cooled for any risk of deterioration by the heat of the support 5.
On procédera de préférence à ces tests dans une chambre noire 20.These tests will preferably be carried out in a dark room 20.
Bien entendu, ceci est un mode de réalisation particulier du dispositif. On pourrait prévoir de procéder à des tests dans chacune des sous-bandes au moyens de sources optiques dont le rayonnement aurait un spectre correspondant à chacune des sous-bandes désirées pour ce test. Dans l'exemple de réalisation particulier qui a été fait, la source optique est une lampe au xénon qui possède un spectre de 250 à 2.500 nanomètres comme l'illustre le schéma de la figure 2.Of course, this is a particular embodiment of the device. Provision could be made to carry out tests in each of the sub-bands by means of optical sources whose radiation would have a spectrum corresponding to each of the sub-bands desired for this test. In the particular embodiment which has been made, the optical source is a xenon lamp which has a spectrum of 250 to 2,500 nanometers as illustrated in the diagram in Figure 2.
Le dispositif de filtrage 3 permet de décomposer le spectre des longueurs d'ondes visibles en quatre sous- bandes correspondant chacune aux couleurs primaires.The filtering device 3 allows the spectrum of visible wavelengths to be broken down into four sub-bands, each corresponding to the primary colors.
Le test consiste donc à vérifier visuellement, sous l'éclairage du faisceau lumineux émis par la lampe 7, que l'information, par exemple le numéro inscrit sous le pavé grattable n'est pas lisible. L'opération est menée pour chacune des sous -bandes ainsi que pour le spectre global . Le test se fait à une puissance lumineuse du faisceau figée à 170 m par cm2' The test therefore consists in visually verifying, under the lighting of the light beam emitted by the lamp 7, that the information, for example the number written under the removable pad, is not legible. The operation is carried out for each of the sub-bands as well as for the global spectrum. The test is carried out at a fixed beam power of 170 m per cm 2 '
Le test est donc effectué de préférence dans une chambre noire. La fibre optique 4 utilisée est une fibre à liquide de refroidissement de diamètre de cœur de 5 mm. Le liquide est dans le cœur 8 de la fibre et permet d'obtenir encore un refroidissement pendant le transport des rayons optiques jusqu'au support 5.The test is therefore preferably carried out in a dark room. The optical fiber 4 used is a coolant fiber with a core diameter of 5 mm. The liquid is in the core 8 of the fiber and makes it possible to obtain further cooling during the transport of the optical rays to the support 5.
La lampe au xénon est une lampe sans ozone de 150 W.The xenon lamp is a 150 W ozone-free lamp.
Pour procéder au test, on va donc placer les différents filtres optiques dans un porte-filtres 7 comme cela est indiqué dans la suite.To proceed with the test, we will therefore place the various optical filters in a filter holder 7 as indicated below.
L'étude de l'opacité en fonction de la longueur d'onde est réalisée de la manière suivante :The study of the opacity as a function of the wavelength is carried out as follows:
- Dans cet exemple de réalisation on utilise un ensemble de filtres optiques ayant des caractéristiques qui leur permettent d'obtenir un filtrage passe-bande dans les quatre bandes citées ci -dessous : . Une première bande analysée est la bande correspondant au violet qui se situe entre 250 et 500 nanomètres. Pour cela on place un filtre dans le porte- filtres 7 ayant cette bande passante. Ceci correspond à la bande passante portant la référence A sur le schéma de la figure 3. . On analyse ensuite la bande entre 370 et 480 nanomètres qui correspond à la bande passante B sur la figure 3. Pour cela on insère deux filtres l'un étant le filtre correspondant au violet et l'autre étant un filtre transparent, . On analyse ensuite la bande 480 et 580 nanomètres qui correspond à la bande passante portant la référence C de la figure 3. Pour cela on insère dans le porte-filtres 7 des filtres correspondant au bleu et au j aune , . Et enfin on analyse la bande entre 580 et 780 nanomètres, ce qui correspond à la bande passante portant la référence D sur la figure 3. Pour cela on insère dans le porte-filtres 7 les filtres dont la bande passante correspond au rouge et les filtres dont la bande passante correspond au transparent.- In this exemplary embodiment, a set of optical filters is used having characteristics which allow them to obtain bandpass filtering in the four bands mentioned below:. A first band analyzed is the band corresponding to purple which is between 250 and 500 nanometers. For this, a filter is placed in the filter holder 7 having this bandwidth. This corresponds to the bandwidth marked with the reference A in the diagram in Figure 3.. The band between 370 and 480 nanometers, which corresponds to the passband B in FIG. 3, is then analyzed. For this, two filters are inserted, one being the filter corresponding to purple and the other being a transparent filter,. The band 480 and 580 nanometers, which corresponds to the pass band carrying the reference C in FIG. 3, is then analyzed. For this, filters corresponding to blue and yellow are inserted into the filter holder 7. And finally we analyze the band between 580 and 780 nanometers, which corresponds to the bandwidth with the reference D in Figure 3. For this we insert into the filter holder 7 filters whose bandwidth corresponds to red and the filters whose bandwidth corresponds to transparent.
Bien sûr, le test sur la totalité du spectre se fait sans la présence des filtres dans le porte-filtres 7.Of course, the test on the whole spectrum is done without the presence of the filters in the filter holder 7.
Tableau de valeurs relatif à la figure 2. Table of values relating to Figure 2.

Claims

REVENDICATIONS
1. Procédé de test visuel d'opacité de pavés grattables (6) masquant une information inscrite sur un support (5), caractérisé en ce qu'il consiste à éclairer successivement le pavé grattable à travers le support au moyen de rayons optiques appartenant à des sous-bandes de la bande des longueurs d'ondes du spectre visible.1. A method of visual test of opacity of scrapable pavers (6) masking information written on a support (5), characterized in that it consists in successively illuminating the scrapable pavé through the support by means of optical rays belonging to sub-bands of the wavelength band of the visible spectrum.
2. Procédé de test selon la revendication 1, caractérisé en ce que pour éclairer successivement le pavé grattable on réalise une décomposition en sous- bandes, de la bande de longueurs d'ondes du domaine visible émise par une source optique (1) dont le spectre couvre cette bande.2. Test method according to claim 1, characterized in that to successively illuminate the scrapable pad, a decomposition into sub-bands is carried out, of the wavelength band of the visible domain emitted by an optical source (1), the spectrum covers this band.
3. Procédé de test selon la revendication 1 ou 2 , caractérisé en ce que l'on sélectionne quatre sous- bandes susceptibles de se recouvrir partiellement .3. Test method according to claim 1 or 2, characterized in that one selects four sub-bands capable of partially overlapping.
4. Procédé de test selon la revendication 3, caractérisé en ce que les sous-bandes sélectionnées sont de 250 à 500 nanomètres, 370 à 480 nanomètres, 480 à 580 nanomètres et 580 à 780 nanomètres.4. Test method according to claim 3, characterized in that the selected sub-bands are from 250 to 500 nanometers, 370 to 480 nanometers, 480 to 580 nanometers and 580 to 780 nanometers.
5. Procédé de test selon la revendication 2, caractérisé en ce que les rayons optiques émis par la source (1) sont guidés par une fibre optique (4) . 5. Test method according to claim 2, characterized in that the optical rays emitted by the source (1) are guided by an optical fiber (4).
6. Procédé de test selon l'une quelconque des revendications précédentes, caractérisé en ce que l'on opère un refroidissement pendant le transport des rayons optiques jusqu'au support afin de ne pas dégrader ledit support (5) et/ou l'emballage du support .6. Test method according to any one of the preceding claims, characterized in that cooling takes place during the transport of the optical rays to the support so as not to degrade said support (5) and / or the packaging. of support.
7. Procédé de test selon les revendications 2 et 6 , caractérisé en ce que l'on opère un refroidissement de la source (2) de rayons optiques.7. Test method according to claims 2 and 6, characterized in that one operates a cooling of the source (2) of optical rays.
8. Dispositif de test visuel d'opacité de pavés grattables (6) masquant une information inscrite sur un support, caractérisé en ce qu'il comprend une source optique (1) ayant un spectre couvrant la bande des longueurs d'ondes du visible associée à une pluralité de filtres optiques (3) permettant de décomposer ladite bande en sous-bandes.8. Device for visual test of opacity of scrapable pavers (6) masking information written on a support, characterized in that it comprises an optical source (1) having a spectrum covering the band of the wavelengths of the associated visible to a plurality of optical filters (3) making it possible to decompose said band into sub-bands.
9. Dispositif de test visuel d'opacité selon la revendication 8, caractérisé en ce qu'il comporte une chambre de refroidissement (2) de la source des rayons optiques .9. Visual opacity test device according to claim 8, characterized in that it comprises a cooling chamber (2) of the source of the optical rays.
10. Dispositif de test selon la revendication 8 ou 9, caractérisé en ce qu'il comporte une fibre optique (4) pour guider les rayons optiques éclairant le pavé (6) à travers le support (5) . 10. Test device according to claim 8 or 9, characterized in that it comprises an optical fiber (4) for guiding the optical rays illuminating the pad (6) through the support (5).
11. Dispositif de test selon la revendication 10, caractérisé en ce que le cœur (8) de la fibre optique (4) contient un produit de refroidissement.11. Test device according to claim 10, characterized in that the core (8) of the optical fiber (4) contains a cooling product.
12. Dispositif de test selon les revendications 8 à 11, caractérisé en ce que des filtres optiques (3) sont susceptibles d'être associés deux à deux, pour obtenir une décomposition de la. bande des longueurs d'ondes du visible en quatre sous-bandes. 12. Test device according to claims 8 to 11, characterized in that optical filters (3) may be associated two by two, to obtain a decomposition of the. visible wavelength band in four sub-bands.
PCT/FR2000/000548 1999-03-16 2000-03-03 Method for visually testing opacity of scratch-off tiles and implementing device WO2000055604A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU31720/00A AU3172000A (en) 1999-03-16 2000-03-03 Method for visually testing opacity of scratch-off tiles and implementing device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9903247A FR2791135B1 (en) 1999-03-16 1999-03-16 METHOD FOR VISUAL TEST OF OPACITY OF FREE PAVERS AND DEVICE FOR IMPLEMENTING IT
FR99/03247 1999-03-16

Publications (1)

Publication Number Publication Date
WO2000055604A1 true WO2000055604A1 (en) 2000-09-21

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AU (1) AU3172000A (en)
FR (1) FR2791135B1 (en)
WO (1) WO2000055604A1 (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4224513A (en) * 1978-04-06 1980-09-23 Measurex Corporation Apparatus for the on-line measurement of the opacity of a paper sheet
FR2481454A1 (en) * 1980-02-04 1981-10-30 Energy Conversion Devices Inc APPARATUS AND METHOD FOR EXPLORING BIOLOGICAL MATERIALS
US4380396A (en) * 1980-12-29 1983-04-19 Consolidated Papers, Inc. Method and apparatus for measuring the opacity of sheet material
JPH02268253A (en) * 1989-04-11 1990-11-01 Nippon Steel Corp Measuring method of transmittance of material
WO1990016099A1 (en) * 1989-06-14 1990-12-27 Australian Electro Optics Pty Ltd Optically switched, fluid cooled, diode pumped, fibre bundle coupled solid state laser
US5369494A (en) * 1993-04-12 1994-11-29 X-Rite, Incorporated Portable scanning colorimeter
EP0668092A1 (en) * 1994-02-19 1995-08-23 The Wiggins Teape Group Limited Lottery ticket paper

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4224513A (en) * 1978-04-06 1980-09-23 Measurex Corporation Apparatus for the on-line measurement of the opacity of a paper sheet
FR2481454A1 (en) * 1980-02-04 1981-10-30 Energy Conversion Devices Inc APPARATUS AND METHOD FOR EXPLORING BIOLOGICAL MATERIALS
US4380396A (en) * 1980-12-29 1983-04-19 Consolidated Papers, Inc. Method and apparatus for measuring the opacity of sheet material
JPH02268253A (en) * 1989-04-11 1990-11-01 Nippon Steel Corp Measuring method of transmittance of material
WO1990016099A1 (en) * 1989-06-14 1990-12-27 Australian Electro Optics Pty Ltd Optically switched, fluid cooled, diode pumped, fibre bundle coupled solid state laser
US5369494A (en) * 1993-04-12 1994-11-29 X-Rite, Incorporated Portable scanning colorimeter
EP0668092A1 (en) * 1994-02-19 1995-08-23 The Wiggins Teape Group Limited Lottery ticket paper

Also Published As

Publication number Publication date
FR2791135B1 (en) 2001-04-20
FR2791135A1 (en) 2000-09-22
AU3172000A (en) 2000-10-04

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