EP1170707B1 - Appareil portatif pour l'authentification de marques sur documents - Google Patents

Appareil portatif pour l'authentification de marques sur documents Download PDF

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Publication number
EP1170707B1
EP1170707B1 EP01115891A EP01115891A EP1170707B1 EP 1170707 B1 EP1170707 B1 EP 1170707B1 EP 01115891 A EP01115891 A EP 01115891A EP 01115891 A EP01115891 A EP 01115891A EP 1170707 B1 EP1170707 B1 EP 1170707B1
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EP
European Patent Office
Prior art keywords
laser
sensor
sensor according
detection
document
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
EP01115891A
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German (de)
English (en)
Other versions
EP1170707A3 (fr
EP1170707A2 (fr
Inventor
Arnim Franz-Burgholz
Hans Zerbel
Benedikt Dr. Ahlers
Anett Dr. Bailleu
Uwe Weber
Roland Dr. Gutmann
Manfred Dr. Paeschke
Peter Dr. Halter
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.)
Baumer Electric AG
Bundesdruckerei GmbH
Original Assignee
Baumer Electric AG
Bundesdruckerei GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Baumer Electric AG, Bundesdruckerei GmbH filed Critical Baumer Electric AG
Publication of EP1170707A2 publication Critical patent/EP1170707A2/fr
Publication of EP1170707A3 publication Critical patent/EP1170707A3/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
    • G07D7/128—Viewing devices
    • 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 relates to a hand-held sensor for the authenticity detection of signs on documents according to the preamble of claim 1.
  • a hand-held sensor for the authenticity detection of signs on documents according to the preamble of claim 1.
  • Such a sensor is associated with the subject of DE 41 17 011 A1 become known, in particular diffuse, low-intensity radiation to be detected, as they also occur in the examination of provided with luminescence features banknotes.
  • the sensor system described therein consists of a conically widened light fiber rod and a further processing optics, with the narrow cross-sectional end of the fiber rod, the radiation coming from the measurement object can be detected in a large solid angle.
  • the GB 2 334 574 A describes a sensor for the authenticity detection of luminescent recognition features on documents, according to the preamble of claim 1.
  • the invention has for its object to further develop a hand-held sensor for the authenticity detection of signs on documents so that luminescent signets (ie with fluorescence, phosphorescence, Up-conversion, etc. based authenticity features) on the document over a much larger area on the document can be recognized and a hand-held operation is possible.
  • the invention is characterized by the technical teaching of claim 1.
  • a hand-held sensor according to the invention is preferably used when authenticity tags which are not recognized by machine still have to be subsequently checked for authenticity.
  • An essential feature of the invention is that a beam emitted by a beam source beam is converted by a focusing optics such that on the surface of the document to be examined results in an approximately line-shaped scan line, which optically excites the identification feature disposed on the document and the optical response signal via a Detection optics is evaluated by an evaluation unit.
  • the term "identification feature” is generally used as the authenticity of a document designating feature, which can be applied directly to the document itself, but which is also arranged in the area of a signet.
  • the term "signet” describes a mark or label, a seal, a delimited area of any kind, or a printing area on a document on which the recognition feature is arranged (eg, applied by sticking), detachably or permanently attached to the document. In the later description, it is left open whether the identifying feature is directly on the document itself or is part of a document attached to the document which is separably or inseparably connected to the document.
  • the excitation wavelength is greater than the reflected wavelength emitted by the recognition feature. in the In terms of frequency range, this means that the excitation frequency is lower than the response frequency.
  • the invention also relates to other excitation mechanisms, such as the exploitation of the "normal" Fluoreszenz bines, in which is excited with a certain wavelength and the fluorescent recognition feature responds with a larger wavelength, which represents the opposite effect to the mentioned up-conversion effect.
  • a third embodiment relates to the fluorescence effect, in which the excitation is at the same wavelength as the emission wavelength, but the response pulse follows the excitation pulse at a defined time interval with a time delay.
  • Hand-held sensors have two opposite requirements:
  • the evaluation of the signal of the hand-held sensor should be as sensitive as possible in order to be able to detect even relatively weak signets.
  • the laser arranged in the hand-held sensor generates a powerful, high-energy laser beam.
  • the laser beam can lead to injuries in case of incorrect operation.
  • the laser should have the lowest possible laser class, to avoid that one high-energy laser can cause injury to the human body during operation.
  • the invention succeeds in realizing a high-sensitivity scanning of a low-emissivity signet with a relatively high-energy laser, because a relatively high-energy laser source with a class of laser can be used more than Class 3A, and according to the invention ensures that the laser only is switched on when the hand-held sensor has been moved close enough to the scanning surface to be examined and / or that the sensor can be classified into the laser class 3A or lower by means of beam-shaping measures despite the strong radiation source.
  • the invention proposes a sensor system which detects and evaluates the approach of the laser to the document surface and accordingly controls the activation and, if necessary, the elimination of the laser.
  • a preferred laser class which on the one hand excludes an effective detection even of low-radiation signets and on the other health hazards, is the laser class 3A.
  • the arranged in the hand-held laser laser only goes into operation when reliably on the top surface, the approach or even touchdown on an object with the signet (recognition feature) arranged thereon has been detected. In this way, the eye protection is achieved even with stronger lasers.
  • the approach takes place by scanning the surface of the object.
  • a sampling can be effected by means of an optical system and a preferably operating in the IR range transmitting / receiving device, wherein, for example, an LED as a transmitting diode and a single or a double photodiode is connected as a receiving diode.
  • the scanning beam of this arrangement is reflected by the object to be examined, then the reflected beam is evaluated by the receiving photodiode in the hand sensor and thus the approach to the object is reliably detected. Only when this approach has been established does the laser go into action and scan the object with the laser beam to verify the recognition feature.
  • a focused optic is used which allows only light from the light spot 24 to fall onto the photodiode when the object lies directly in front of or very close to the exit window 7.
  • a Triangulationsausêt can be achieved. If the object is further away from the exit window 7, the light imaged by the light spot 24 strikes the one photodiode (first part of the double photodiode), called the background diode. On the other hand, if the object is directly in front of the exit window, the light falls on the other photodiode (second part of the double photodiode), called foreground diode. In this way, the approach can be detected even safer, as with only one photodiode.
  • a touching scan takes place.
  • a touching scan may e.g. As a contact switch, or a Pressure sensor, which only emits a signal when the top surface of the hand sensor has been placed on the object.
  • All mentioned proximity detections can preferably be combined with a manually operable button (switch or push-button) so that the laser is switched on only when this button is pressed additionally and when the proximity of the hand-held sensor to the object is detected.
  • a manually operable button switch or push-button
  • a so-called line optics is used in the hand sensor for the generation of laser beams.
  • the senor can be classified in a deeper and thus less dangerous laser class than without these measures.
  • the sensor can be classified into laser class 3A instead of 3B because of these measures, which means a very important difference.
  • a laser which is more favorable for the evaluation of weak signals and which is somewhat stronger can nevertheless be used, which nevertheless ensures a safe handling of the hand sensor.
  • the line optic consists in the simplest case of a cylindrical lens.
  • a positive lens i. V. m. a cylindrical lens or specially shaped cylindrical lenses.
  • the condenser lens hereby focuses on the object surface, while the cylindrical lens cause the strongly divergent (defocused) rays on the object, which generate the elongated sensing bar on the object.
  • the hand sensor has an approximately circular cylindrical housing substantially in cross-section, which, however, can also be polygonal or oval. This housing is designated 19 in FIG.
  • one or more batteries or accumulators 20 may be arranged, which serve for the power supply of the laser diode 1.
  • an external power connection can also be provided on the housing.
  • a separate battery pack can be provided, which is connected via a longer cable to the hand sensor.
  • the laser diode 1 generates a beam 34, which initially passes one or more focusing lenses 2. These focusing lenses 2 focus the beam in the X direction (beam 32 in FIG. 5) essentially onto the object plane of the object 5 which carries the identification feature 21.
  • line optical system 3 is passed, which in the simplest case consists of a cylindrical lens.
  • the term "line optics 3" is generally understood to mean any optics capable of producing an approximately line-shaped or elliptical scanning bar 22. This sensing bar 22 is shown for example in Figure 5 and will be described in more detail in connection with this figure.
  • the generated beam 31, 32, shown in Figure 5, and summarized as transmission beams 28 in Figure 1, is directed to a deflection mirror 4, which has been omitted in Figure 5 for the sake of simplicity.
  • Figure 5 generates, which emerges from the exit window 7 on the top surface 26, 27 of the hand sensor.
  • FIG. 3 shows that the top surface 26 (width of the scanning head) is substantially larger than the width of the exit window 7 in comparison.
  • the gem. 2 generated sensing bar 22 is guided in the direction of arrow 23 in the direction of the identification feature 21 on the object 5.
  • a light spot 24 of the proximity sensor system is shown, which scans the document surface.
  • the evaluation of the reflected portion determines the presence of the document.
  • the light spot 24 only covers the scanning bar 22 by way of example. It can also be arranged next to, behind or in front of the scanning bar.
  • the term light spot 24 should not imply that it is visible light. It can also be in the invisible area, namely in the IR or in the UV range.
  • the reflected by the detection feature 21 beam portion which may have a different wavelength than the transmission beam 6 is returned as a receiving beam 8 in the hand sensor and focused on a first receiving lens 9.
  • a second receiving lens 9 ' can be arranged, which causes a further focusing.
  • the received and focused receive beam is finally irradiated via an optical filter 10 to a receiving element 11, which may be, for example, a photodiode or an avalanche photodiode.
  • a photomultiplier can also be used.
  • the advantage is achieved that thanks to the use of a special line optics, a transmission beam with steep beam angles is formed, which in turn allows the classification of the hand sensor in a relatively low, non-hazardous laser class.
  • a transmission beam is emitted by means of a light-emitting diode 14, preferably in the IR range, which is focused onto the exit window 7 via a deflection mirror 13 and one or more lenses 12.
  • the light-emitting diode beam strikes the surface of an object 5, which is touched directly by the window 7 of the hand-held sensor or is arranged at a short distance in front of this window.
  • the beams reflected by the object 5 are again received in the same way by lenses 12, where they are deflected via the deflecting mirror 13 and fed to a receiving diode 14 ', which is connected to a corresponding electronics.
  • the receiving diode 14 As soon as the receiving diode 14 'detects a reflected transmission beam of the proximity sensor, it is ensured that the manual sensor in tight or even touching distance on the object 5 is seated and only if this case is given, the laser diode 1 is turned on.
  • touching samples may also be used. It then eliminates the arrangement of the LED 14 and photodiode 14 'and instead can be a touching scan of the object surface, such. B. done by a contact switch or a contact clip or a pressure sensor.
  • the proximity detection should ensure that the laser is only switched on when it is ensured that the exit window 7 is placed on the object 5 in a touching or almost touching manner.
  • a push button 15 may be arranged in the housing 19, which is actuated by manual finger pressure and the laser diode 1 is turned on when actuated.
  • a heat sink 16 for the laser diode 1 can be installed in the housing, which preferably consists of a cooling surface.
  • a temperature stabilizing element 17 can be installed, which z. B. consists of a heating coil or a Peltier element with an additional temperature sensor.
  • the temperature stabilizing element 17 is intended to ensure a uniform temperature of the laser diode 1.
  • the heat generated by the Peltier element has to be dissipated via a further heat sink 18.
  • heat sinks 16 and 18 described here are not necessary for the solution and can be omitted if necessary.
  • the temperature stabilizing element 17 can also be omitted in various applications.
  • a scattering cylindrical lens can also be used, in which case the crossing point 25 is beyond the cylindrical lens 3. The crossing point 25 is thus virtual.
  • the advantages are achieved that a relatively high total energy density is brought to the plane of the object 5, but that nevertheless no focusing takes place in a single point on the plane of the object 5 or elsewhere, so that even if instead of the object 5 a human Eye is present, damage to the retina is not to be feared, or at least extremely greatly reduced.
  • the eye can no longer image this beam as a point on the retina.
  • the following combination is claimed, namely the activation of the laser only when the approach to the object surface has been reliably detected and the use of line optics which, despite a relatively high-energy beam, prevents punctiform imaging on a human or animal eye. Furthermore, the laser is only switched on if a push button on the hand sensor was previously activated with a finger pressure.
  • This receiving optics is open, d. H. It has a f-number of about 1 and is therefore particularly sensitive to light.
  • the laser (laser diode 1) can also be replaced by a strong LED or by another radiation source or surface radiator or by a superluminescent diode.
  • the line optics can be omitted if the beam exit already has the desired elongated surface of the scanning bar 22 (length 30 and width 29) and is not coherent.
  • the sensing bar 22 may be formed overall as a round beam of a certain extent.
  • top surface 26 can also be used to seal against extraneous light additional sealing means, such. As lateral Abdichtbürsten or lips or the like. More.
  • the advantage of the described proximity sensor is, moreover, that if the object 5 is a transparent glass, the laser does not turn on. This is because the proximity sensor system preferably reacts to a diffuse and not to a specular reflection on the surface of the object 5.
  • the receiving element 11 of the laser arrangement an external light detection can be realized.
  • the laser is not turned on.
  • the proximity sensor can be integrated into the laser optic itself. In this case, eliminates the elements 12, 13, 14 and the entire proximity sensor is realized by the corresponding query of the receiving element 11.
  • the proximity sensor it is thus also possible to take the laser beam reflected by the object itself.
  • initially only weak, very short and absolutely harmless laser pulses are emitted, with the aid of which the approach is monitored. Only when the clear approximation of the object is detected is the same laser driven up to the stronger laser power required to detect the luminescence features.
  • a beam splitter is arranged, which branches off a certain portion of the laser light reflected from the object and directs to a detection optics, which generates a reflection of the weak, short laser pulses generated by the object evaluates.
  • the radiation fraction reflected by the object is not detected for detection of the approach to the receiving element 11 or by a receiving element arranged in front of the optical filter 10.
  • the recognition of the approach takes place with the photodiode 14 'shown in FIG. 4, but with the reflected, weak and short laser pulses.
  • the laser is pulsed to ambient light or ambient light, which nevertheless penetrates into the receiver as possible to suppress.
  • This is very possible by incorporating high-pass and low-pass filters or band-pass filters in the receiver electronics, which pass only the pulse frequency of the laser.
  • only the desired wavelength of the optical response of the feature optically excited by the laser is transmitted through strong optical filters. All other wavelengths are suppressed, especially the laser wavelength itself, which in most cases interferes with the receiver itself.
  • the laser wavelength only when responding to the same wavelength does the laser wavelength have to be transmitted. In this case, it is measured with a time delay in order to detect the optical response of the feature, that is to say after the end of each laser pulse it is observed whether light from the feature can still be detected during the transmission break.
  • the signals are additionally averaged over several laser pulses. This is preferably done in a microprocessor, after previous analog-to-digital conversion.

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  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Image Input (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Lock And Its Accessories (AREA)
  • Burglar Alarm Systems (AREA)

Claims (13)

  1. Capteur pour l'authentification d'une caractéristique d'identification luminescente sur un document (5)
    - avec une source de rayonnement (I) et une optique de focalisation (2, 3), au moyen de laquelle la caractéristique d'identification est susceptible d' être exposée à une longueur d'onde comme longueur d'onde d'excitation d'un faisceau de rayons (34) de telle sorte que la caractéristique d'identifcation est excitée optiquement et répond le cas échéant avec la même longueur d'onde ou une autre longueur d'onde comme longueur d'onde de réponse d'un signal de réponse (8) optique,
    - avec un récepteur de rayonnement avec une optique de détection (9, 9', 10) et une unité d'analyse (II) pour la détection et l'analyse du signal de réponse (8),
    - un faisceau de rayons, (31, 32) susceptible d' être émis par la source de rayonnement (1) susceptible d' être converti par l'optique de focalisation (2, 3) de telle sorte que, sur la surface du document (5), une barre de balayage (22) est susceptible d' être projetée approximativement en forme de trait, la barre excitant optiquement la caractéristique d'identification (21) au moins dans une zone partielle, et
    - le signal de réponse (8) optique étant susceptible d'être conduit à travers l'optique de détection (9, 9', 10) dans l'unité d'analyse (11) au moyen de laquelle le signal de réponse (8) optique est susceptible d'être analysé,
    caractérisé en ce que,
    - le capteur est guidé à la main,
    - la source de rayonnement (1) est conçue comme laser, et
    - l'optique de focalisation (2, 3) présente une ligne optique avec une lentille cylindrique (3), une reproduction du faisceau de rayons (32, 33) généré par le laser sur le document (5) et traversant la ligne optique (2, 3), s'effectuant différemment dans une direction X et une direction Y.
  2. Capteur selon la revendication 1, caractérisé par une reconnaissance de rapprochement, qui met en marche le laser (1) uniquement dans le cas où le document (5) se trouve juste devant et en contact avec une fenêtre de sortie (7) dans la face supérieure (26, 27) du capteur.
  3. Capteur selon la revendication 2, caractérisé en ce que la reconnaissance de rapprochement travaille sans contact.
  4. Capteur selon les revendications 2 à 3, caractérisé en ce que la reconnaissance de rapprochement réagit à une réflexion diffuse sur la surface du document (5).
  5. Capteur selon la revendication 2, caractérisé en ce que la reconnaissance de rapprochement travaille sans contact sur le document (5).
  6. Capteur selon l'une quelconque des revendications 2 à 4, caractérisé en ce que, en supplément de la reconnaissance de rapprochement, il y a une touche à pression (15) actionnée manuellement, qui est couplée dans un circuit ET avec la reconnaissance de rapprochement ou dont l'actionnement antérieur est une condition préalable à l'activation du laser après la reconnaissance du rapprochement à l'intérieur d'une courte fenêtre temporelle.
  7. Capteur selon l'une quelconque des revendications 1 à 6, caractérisé en ce que la focalisation s'effectue dans un plan X et dans un plan Y à des hauteur différente au-dessus du document (5).
  8. Capteur selon l'une quelconque des revendications 1 à 7, caractérisé en ce que les plus grands angles du faisceau de rayons (32, 33) atteignent dans un plan X ou un plan Y un angle par rapport à l'axe optique supérieur à +/- 10°.
  9. Capteur selon l'une quelconque des revendications 1 à 8, caractérisé en ce qu'une reconnaissance de lumière extérieure est intégrée dans le trajet de réception de l'authentification de la caractéristique d'identification (21).
  10. Capteur selon l'une quelconque des revendications 1 à 9, caractérisé en ce que la reconnaissance de lumière extérieure est intégrée dans un agencement pour la reconnaissance de rapprochement sans contact.
  11. Capteur selon l'une quelconque des revendications 1 à 10, caractérisé en ce qu'il peut être classé comme capteur manuel dans la classe de laser 3A.
  12. Capteur selon l'une quelconque des revendications 1 à 11, caractérisé en ce que le laser est un laser pulsé.
  13. Capteur selon l'une quelconque des revendications 1 à 12, caractérisé par une optique de réception à grande ouverture avec un rapport d'ouverture de pratiquement 1 ou moins.
EP01115891A 2000-07-03 2001-06-29 Appareil portatif pour l'authentification de marques sur documents Expired - Lifetime EP1170707B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10031388A DE10031388A1 (de) 2000-07-03 2000-07-03 Handsensor für die Echtheitserkennung von Signets auf Dokumenten
DE10031388 2000-07-03

Publications (3)

Publication Number Publication Date
EP1170707A2 EP1170707A2 (fr) 2002-01-09
EP1170707A3 EP1170707A3 (fr) 2002-11-06
EP1170707B1 true EP1170707B1 (fr) 2008-02-06

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EP01115891A Expired - Lifetime EP1170707B1 (fr) 2000-07-03 2001-06-29 Appareil portatif pour l'authentification de marques sur documents

Country Status (5)

Country Link
US (1) US6784441B2 (fr)
EP (1) EP1170707B1 (fr)
AT (1) ATE385597T1 (fr)
CA (1) CA2352012A1 (fr)
DE (2) DE10031388A1 (fr)

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GB2334574B (en) * 1998-02-19 2002-08-07 Panoptic Ltd Improvements in/or relating to the detection of counterfeit items
DE19836813A1 (de) * 1998-08-14 2000-02-24 Bundesdruckerei Gmbh Wert- und Sicherheitsdokument mit optisch anregbaren Farbstoffen zur Echtheitsprüfung
GB9822049D0 (en) * 1998-10-10 1998-12-02 Panoptic Ltd Portable ultra-violet light
DE10027726A1 (de) * 2000-06-03 2001-12-06 Bundesdruckerei Gmbh Sensor für die Echtheitserkennung von Signets auf Dokumenten
DE10135828A1 (de) * 2001-07-23 2003-02-06 Giesecke & Devrient Gmbh Laserbeleuchtungsvorrichtung zum Beleuchten eines streifen- oder linienförmigen Bereichs

Also Published As

Publication number Publication date
EP1170707A3 (fr) 2002-11-06
EP1170707A2 (fr) 2002-01-09
DE10031388A1 (de) 2002-01-17
DE50113556D1 (de) 2008-03-20
ATE385597T1 (de) 2008-02-15
US6784441B2 (en) 2004-08-31
US20040031929A9 (en) 2004-02-19
US20030030012A1 (en) 2003-02-13
CA2352012A1 (fr) 2002-01-03

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