EP2323108A1 - Dispositif et procédé de vérification de éléments de sécurité contenues dans la structure fibreuse d'objets plats en papier - Google Patents

Dispositif et procédé de vérification de éléments de sécurité contenues dans la structure fibreuse d'objets plats en papier Download PDF

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Publication number
EP2323108A1
EP2323108A1 EP20100013350 EP10013350A EP2323108A1 EP 2323108 A1 EP2323108 A1 EP 2323108A1 EP 20100013350 EP20100013350 EP 20100013350 EP 10013350 A EP10013350 A EP 10013350A EP 2323108 A1 EP2323108 A1 EP 2323108A1
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EP
European Patent Office
Prior art keywords
light
illumination device
reflector
flat
sensor
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.)
Granted
Application number
EP20100013350
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German (de)
English (en)
Other versions
EP2323108B1 (fr
Inventor
Frank Puttkammer
Reto Schletti
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.)
BEB Industrie Elektronik AG
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BEB Industrie Elektronik AG
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Publication of EP2323108A1 publication Critical patent/EP2323108A1/fr
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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

Definitions

  • the invention is based on a device and a method for detecting security features contained in the fiber structure in flat objects made of paper.
  • Such devices are used in the inspection of objects. These include, for example, detecting, controlling, verifying and verifying the authenticity of objects and identifying counterfeits.
  • the items of paper include, in particular, notes of value or documents such as banknotes, checks, stocks, papers with security imprint, certificates, identity cards, entrance tickets, tickets, vouchers, identification or access cards.
  • Devices for the detection of security features of an object are often part of a multi-component system for processing and processing flat objects. Devices for the detection of security features are used to distinguish counterfeit from real objects.
  • Paper substrates have special properties in the reflection, transmission, absorption and luminescence of light, which can be influenced by the targeted addition of additives in papermaking and coatings.
  • Simple and inexpensive paper used, for example, in printers and copying machines typically has characteristic luminescence and reflection Irradiation of light of the ultraviolet wavelength range.
  • Such papers or paper substrates are therefore referred to as UV bright.
  • Paper substrates of value documents, such as banknotes generally do not exhibit such a behavior upon irradiation of light of the ultraviolet wavelength range, which is why they are referred to as UV dark.
  • UV dark By irradiation of UV light, therefore, documents made of UV-dark paper can be distinguished from counterfeits made of UV-bright paper. However, if the counterfeit also consists of UV dark paper, then this examination is not sufficient to prove the authenticity of a document.
  • the documents are equipped with special security features.
  • security features include, among others, the characteristic fibrous structure of the paper of a document.
  • the document may, for example, contain in the paper structure a watermark, which is produced during papermaking in the wire section of the paper machine. This results in a pattern with areas of a partially higher density of paper fibers and areas with a partially lower density of paper fibers.
  • the density of the paper fibers depends on the translucency of the paper, so that the watermark can be recognized by the naked eye, especially in translucent light.
  • Such targeted changes in the paper structure are referred to as true watermarks. Since the light transmission of a paper can also be influenced by printing inks, watermarks can be simulated by printing on the paper.
  • spurious watermarks can not be distinguished by the naked eye from true watermarks.
  • Falsifications of documents may have spurious watermarks generated by printing a paper with special color pigments. Fake documents can be composed of two separate sheets of paper, one of which is printed with the printed side facing inward. Such spurious watermarks can not be distinguished from genuine watermarks in a simple transmitted light detection, since the light transmission at both are about the same. It is only detected the presence of an optical representation and not the authenticity of the watermark.
  • the invention has for its object to provide an apparatus and a method that allow the detection of a security feature relating to the fiber structure in flat objects made of paper, with a distinction between real, targeted changes in the fiber structure and simulated by printing security features.
  • the device is characterized in that it is equipped with at least one illumination device, a transport device, at least one reflector and a sensor.
  • the flat objects are illuminated by the illumination device with light.
  • the transport device ensures the transport of the flat objects relative to the illumination device.
  • the transport of the flat objects takes place along a transport plane in a transport direction predetermined by the transport device.
  • the flat objects are conveyed successively through the transport device.
  • the sensor is arranged offset in the transport direction to the illumination device and after the illumination device. This prevents the light from the illumination device from hitting the sensor directly when there is no flat object between the illumination device and the sensor. An overload of the sensor is avoided.
  • At least one reflector is provided.
  • Lighting device and reflector are arranged offset in the transport direction. They are both outside the transport plane and on the same side of the transport plane, for example both above or both below the transport plane. Reflector and sensor are on different Pages of the transport level. The beam path of the light crosses the transport plane between the reflector and the sensor. The sensor thus detects the transmission of light through the flat object.
  • the reflector in extension of the optical axis of the illumination device.
  • the light of the illumination device is deflected in the direction of the reflector by reflection.
  • This reflection is particularly preferably by the flat objects themselves.
  • the illumination device is aligned with its optical axis in the direction of the transport plane. If a flat object is located at the intersection of the optical axis of the illumination device on the one hand and the transport plane on the other hand, the light of the illumination device is reflected on the surface of the flat object and reaches the reflector. If no flat object is located at the point of intersection, the light of the illumination device is not deflected in the direction of the reflector. In this case, no light of the illumination device is detected by the sensor.
  • the illumination device illuminates the flat objects over their entire width perpendicular to the transport direction. Thus, the flat objects are fully illuminated during transport.
  • the illumination device can be equipped with a plurality of light sources, for example with light-emitting diodes.
  • It may be an illumination device for the continuous emission of light or for the generation of light pulses. If light pulses are generated, it is possible to emit light pulses of different wavelength ranges offset in time and to examine different features of the flat objects.
  • a sensor can be used, which can detect the light of the different wavelength ranges or different sensors must be used for the different wavelength ranges.
  • the wavelength of the light emitted by the illumination device is predetermined in such a way that, when the light passes through the flat objects, an interaction between the paper and the light takes place and this effect is considerably stronger than an interaction between the light and that present on the flat object printing inks.
  • an interaction between the light and the printing inks is negligible in relation to the interaction between the light and the paper substrate.
  • light of the UV wavelength range is preferably used. It is thus achieved that with the device according to the invention only features are detected which relate to the paper substrate of the flat article and the fiber structure. Features produced by means of printing inks on the flat object, on the other hand, are negligible.
  • the sensitivity of the sensor can be adjusted so that features regarding inks are not displayed.
  • the reflector picks up the light emitted by the illumination device and optionally reflected on a transported flat object or a surface of the device and reflects it in the direction of the transport plane. There, the light hits a flat object transported in the transport direction.
  • the reflector ensures that the objects to be examined are illuminated as large as possible. In particular, the objects are illuminated over their entire width perpendicular to the transport direction.
  • the device may be provided with another reflector to redirect the light after transmission through a flat object and to direct it again to the flat object.
  • the sensor is arranged on the same side of the transport plane as the illumination device and the first reflector. The intensity of the light reaching the sensor is greatly reduced due to a first and a second transmission. In this case, in order to be able to detect an effect on the fiber structure of a flat object on the sensor, the intensity of the light of the illumination device must be sufficiently high.
  • the sensor preferably also extends perpendicular to the transport direction over the entire width, which is covered by the flat objects during their transport. In this way, the flat objects can be completely scanned during their transport to capture all the features.
  • the sensor allows a spatially resolved detection of the light transmitted through the articles due to transmission. The result is compared for evaluation with the given for a real flat object measurement data pattern.
  • the transport means provides for a continuous transport of the flat objects relative to the illumination device, the reflector and the sensor so that the flat objects can be examined one after the other.
  • the lighting of the flat objects takes place during the transport. Since even a high transport speed is small compared to the speed of light, the flat objects can be regarded as dormant with respect to illumination and evaluation.
  • the illumination device is aligned with its optical axis in the direction of the transport plane.
  • the optical axis is the central straight line around which the illumination device emits the light symmetrically.
  • each of the light sources has an optical axis, wherein each of the optical axes is aligned in the direction of the transport plane.
  • all optical axes are parallel.
  • the light emitted by the illumination device thus hits directly on the objects transported by means of the transport device and is at least partially reflected on the surface of the objects. Light that penetrates the flat objects due to transmission fades out and therefore does not get to the sensor.
  • a shield in the direction of the sensor is provided on the side facing away from the illumination device side of the transport plane in extension of the optical axis. Furthermore, care can be taken that no light reflecting surface of the illumination device is present on the side facing away from the illumination device in order to prevent the light, after transmission through an object, from reentering the beam path of the device and striking the reflector.
  • the reflection of the light on the flat objects reduces the intensity of the light of the illumination device. Furthermore, light is only directed in the direction of the reflector when a flat object is located on the illumination device. This prevents the light of the illumination device from reaching the sensor directly without reducing the intensity. Furthermore, reflection of the light at the flat objects on the sensor generates a reference signal which can be compared with the signal generated due to transmission. If a flat object is already in the area of the illumination device but not yet in the beam path between the reflector and the sensor, then the light arriving at the sensor has been reflected on the flat object, but transmission through the flat object has not taken place. The signal obtained in this case can be used for the relevant object in the evaluation as a reference signal.
  • the reference signal can also be obtained when the flat object in both the lighting device as also located between the reflector and the sensor.
  • the reference signal is determined in an area of the flat article in which the fibers are evenly distributed.
  • the reference signal has the advantage that a comparison, in particular in the area of the fiber structure containing the security feature, can be carried out with the reference signal for each paper substrate.
  • the influence that the paper substrate exerts on the light intensity with uniform fiber distribution in transmission can be distinguished from the influence on the light intensity of a security feature included or not included in the fiber structure in the same paper substrate.
  • a relative evaluation is possible. This is particularly advantageous because flat objects, in particular banknotes, use different paper substrates and the security features in the fiber structure are to be reliably detected for all types of paper substrates.
  • a direct irradiation of light of the illumination device on the reflector preventing separation is arranged between the illumination device and the reflector.
  • the light from the illumination device can only reach the reflector when it is reflected on a transported flat object.
  • scattered light is not completely but largely avoided when the separation has a small opening for the light, wherein the opening is centered around the intended beam path.
  • the transport plane is predetermined by at least one flat, flat component.
  • the flat planar component is transparent to the light of the illumination device.
  • the flat flat component may, for example, be a transparent glass plate. This flat, flat component ensures that the flat objects remain in the transport plane and do not deviate from the intended transport route. It also protects the Lighting device and the reflector against the ingress of dust and other dirt.
  • the flat planar component in the region in which the at least one optical axis of the illumination device intersects the transport plane equipped with at least one reflective layer to reflect the light of the illumination device to the reflector.
  • the illumination device and the reflector are arranged on one side of the flat, planar component and the sensor on the other side of the flat, planar component.
  • the illumination device comprises at least one UV light source.
  • Light of the ultraviolet wavelength range is particularly useful to study the fiber structure of flat articles of paper.
  • the illumination device, the reflector and the sensor are shielded against the penetration of ambient light. This prevents the measurement of the transmission of light of the illumination device by a flat object from being influenced or impaired by ambient light.
  • the reflector has at least one planar, reflective surface. This can for example be part of a plate.
  • the reflector has a cuboid chamber with inwardly facing reflective surfaces and openings for the beam path.
  • the chamber prevents the ingress of ambient light or direct light from the illumination device.
  • the reflector is curved. It is preferably a curvature inwards, so that the incident light is bundled in the direction of the transport plane.
  • the senor comprises a line scan camera aligned perpendicular to the transport direction.
  • the line scan camera is arranged in a housing with a narrow entrance slit for the light reflected by the reflector of the illumination device.
  • the narrow entrance slit allows penetration of the light reflected from the reflector and suppresses the ingress of ambient light.
  • the gap reaches up to the transport plane.
  • the inventive method with the features of claim 15 is characterized in that the light of a lighting device is reflected at least one reflector and is directed to a flat object after reflection.
  • a sensor detects the transmission of light through the object.
  • the flat object is transported in a transport plane in a predetermined transport direction.
  • the device according to the invention can be used to carry out the method.
  • the illumination device is aligned to a first illumination of the flat objects with its at least one optical axis to the transport plane.
  • the reflected light from the flat objects of the illumination device is guided by means of the reflector to a second illumination of the flat objects in the direction of the transport plane.
  • FIG. 1 shows a first embodiment of an apparatus for detecting security features contained in the fiber structure in flat objects made of paper with a lighting device 1, a transport device, not shown in the drawing, a reflector 2 and a sensor 3.
  • the device is used to detect security features in the form of watermarks in flat objects 4.
  • the flat objects are banknotes.
  • the flat objects 4 are transported by the transport device in the transport direction 5 along a transport plane 6.
  • the illumination device 1 and the reflector 2 form a unit below the transport plane 6, which is referred to as optical transmitter.
  • Lighting device 1 and reflector 2 are located in a common housing 7, which protects the unit from the ingress of ambient light and impurities.
  • a partition 8 is arranged, which prevents the light of the illumination device from radiating directly in the direction of the reflector 2. Thanks to this separation, the light of the illumination device 1 reaches the reflector 2 only after reflection on a flat object 4.
  • the sensor 3 together with a surrounding housing 9, a second unit, which is referred to as an optical receiver.
  • the illumination device emits light in the direction of the transport plane 6. There, the light strikes a flat object 4 for a first time, is reflected on its surface and reaches the reflector 2. From there, the light strikes the flat object 4 a second time.
  • the sensor 3 detects this due to transmission through the flat object passed through light. Due to the large-area illumination of the flat object 4 by the illumination device 1 and the reflector 2 and due to the detection of the transmission over the entire width of the flat object perpendicular to the transport direction and due to the transport of the flat object relative to the sensor, the entire flat object in two dimensions recorded and optically scanned.
  • the beam path of the light from the illumination device 1 to the sensor 3 is represented by arrows 10.
  • FIG. 2 shows a second embodiment of an apparatus for detecting security features contained in the fiber structure with a lighting device 11, a reflector 12 and a sensor 13.
  • the lighting device 11 consists of several arranged in a row or row light-emitting diodes.
  • Lighting device 11 and reflector 12 are arranged in a common housing 14. Between the illumination device 11 and the reflector 12 is a partition 15 with an opening 16 for the at. In FIG. 2 not shown flat object reflected light.
  • the housing 14 is covered at the top by a flat flat member 17 in the form of a glass plate.
  • the upward-facing surface of this glass plate forms the transport plane 18. Along this surface, a flat object is transported by a transport device, not shown. Above the transport plane 18, the sensor 13 is arranged.
  • a radiation-tight cover 19 protects the sensor from the ingress of ambient light. Via a narrow entry slot 20, which is covered by a transparent window 21, and via rod lenses 22, the light reflected by the reflector 12 reaches the sensor 13. The arrangement of the rod lenses 22, which is offset towards the radiation-tight cover, causes the penetration of ambient light additionally difficult.
  • the operation of this second embodiment corresponds to the device according to the first embodiment.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
EP10013350.3A 2009-11-17 2010-10-06 Dispositif et procédé de vérification de éléments de sécurité contenues dans la structure fibreuse d'objets plats en papier Active EP2323108B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009053440A DE102009053440A1 (de) 2009-11-17 2009-11-17 Vorrichtung und Verfahren zum Nachweis von in der Faserstruktur enthaltenen Sicherheitsmerkmalen bei flachen Gegenständen aus Papier

Publications (2)

Publication Number Publication Date
EP2323108A1 true EP2323108A1 (fr) 2011-05-18
EP2323108B1 EP2323108B1 (fr) 2015-11-25

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EP10013350.3A Active EP2323108B1 (fr) 2009-11-17 2010-10-06 Dispositif et procédé de vérification de éléments de sécurité contenues dans la structure fibreuse d'objets plats en papier

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EP (1) EP2323108B1 (fr)
DE (1) DE102009053440A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH661603A5 (en) * 1985-01-11 1987-07-31 Sodeco Compteurs De Geneve Apparatus for authenticating and identifying valuable documents, especially bank notes
DE10000030A1 (de) * 2000-01-03 2001-07-05 Giesecke & Devrient Gmbh Kamerasystem für die Bearbeitung von Dokumenten
EP1128337A1 (fr) * 2000-02-07 2001-08-29 Giesecke & Devrient GmbH Dispositif et procédé pour la vérification de billets de banque
DE10341805A1 (de) * 2003-09-10 2005-06-23 Giesecke & Devrient Gmbh Beleuchtungsvorrichtung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4031633A1 (de) * 1990-10-05 1992-04-16 Sick Optik Elektronik Erwin Optische inspektionsvorrichtung
AT402861B (de) * 1994-03-28 1997-09-25 Oesterr Forsch Seibersdorf Verfahren und anordnung zum erkennen bzw. zur kontrolle von flächenstrukturen bzw. der oberflächenbeschaffenheit
EP2166515B1 (fr) * 2007-03-29 2013-12-18 Glory Ltd. Dispositif d'identification de feuilles de papier, dispositif de traitement de feuilles de papier et procédé d'identification de feuille de papier

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH661603A5 (en) * 1985-01-11 1987-07-31 Sodeco Compteurs De Geneve Apparatus for authenticating and identifying valuable documents, especially bank notes
DE10000030A1 (de) * 2000-01-03 2001-07-05 Giesecke & Devrient Gmbh Kamerasystem für die Bearbeitung von Dokumenten
EP1128337A1 (fr) * 2000-02-07 2001-08-29 Giesecke & Devrient GmbH Dispositif et procédé pour la vérification de billets de banque
DE10341805A1 (de) * 2003-09-10 2005-06-23 Giesecke & Devrient Gmbh Beleuchtungsvorrichtung

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Publication number Publication date
DE102009053440A1 (de) 2011-05-19
EP2323108B1 (fr) 2015-11-25

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