FR2839574A1 - Area access badge recognition unit having detector with low electrical consumption and badge/reader with badge larger electrical consumption limited time raising detection threshold - Google Patents
Area access badge recognition unit having detector with low electrical consumption and badge/reader with badge larger electrical consumption limited time raising detection threshold Download PDFInfo
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- FR2839574A1 FR2839574A1 FR0205781A FR0205781A FR2839574A1 FR 2839574 A1 FR2839574 A1 FR 2839574A1 FR 0205781 A FR0205781 A FR 0205781A FR 0205781 A FR0205781 A FR 0205781A FR 2839574 A1 FR2839574 A1 FR 2839574A1
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- badge
- detection
- signal
- unit according
- activation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
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- Engineering & Computer Science (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
Description
d'une serie d'images, vers une ou plusieurs adresse(s) preprogrammee(s).from a series of images, to one or more preprogrammed address (es).
sl9 777 - 1sl9 777 - 1
DESCRIPTIONDESCRIPTION
La presente invention concerne le domaine de la reconnaissance ou de ['identification a distance de personnel porteuses d'un indicateur ou d'un marqueur specifique, notamment sous la forme d'un badge, d'une carte ou analogue, et a pour objet une unite de reconnaissance d'un badge ou analogue, ainsi qu'un procede mettant en ccuvre une telle unite. La mise en ceuvre de systemes de reconnaissance de personnel au moyen de badges portables sans contact suppose au niveau du dispositif fixe de reconnaissance, as socie par exemple a un controle d' acces a un local ou un site, la possibilite d'activer etlou d'interroger a distance- lesdits badges. A cet effet, il est necessaire, dans un perimetre minimal defini, d'emettre des signaux electromagnetiques ou de generer un champ electromagnetique predetermines sus ceptibles d' influencer les circuits du badge ou analogue et de declencher ['emission d'une reponse par ce dernier p ouvant etre rec epti onnee et analys ee p ar le di sp o siti f fix e a l' origine de s The present invention relates to the field of remote recognition or identification of personnel carrying a specific indicator or marker, in particular in the form of a badge, a card or the like, and has for its object a badge recognition unit or the like, as well as a method implementing such a unit. The implementation of personnel recognition systems by means of contactless portable badges presupposes at the level of the fixed recognition device, as a company, for example, a control of access to a room or a site, the possibility of activating and / or 'interrogate these badges remotely. To this end, it is necessary, within a defined minimum perimeter, to emit electromagnetic signals or to generate a predetermined electromagnetic field capable of influencing the circuits of the badge or the like and to trigger ['emission of a response by this last p able to be received and analyzed by the di sp o siti f fixed at the origin of s
signaux ou du champ precise(s).signals or precise field (s).
En variante, la reponse du badge ou analogue peut etre de nature passive et consister par exemple en une modification ou une alteration du champ electromagnetique, cette derriere etant alors captee et As a variant, the response of the badge or the like may be of a passive nature and consist, for example, of a modification or an alteration of the electromagnetic field, the latter then being picked up and
evaluee par le dispositif fixe.evaluated by the fixed device.
Dans les deux cas evoques ci-dessus, le dispositif fixe doit etre en mesure de generer de maniere permanente, ou eventuellement intermittente mais a un ryme rapide, un champ ou des signaux vehiculant une energie suffisante pour declencher la reaction du badge ou obtenir une In the two cases mentioned above, the fixed device must be able to generate permanently, or possibly intermittently but at a rapid rate, a field or signals conveying sufficient energy to trigger the reaction of the badge or obtain a
alteration detectable du champ electromagnetique. detectable alteration of the electromagnetic field.
Or, une telle operation, meme si elle est realisee de maniere discontinue, est fortement consommatrice d'energie electrique, d'autant plus - qu'on recherche bien entendu une distance de reconnaissance ou de lecture des badges la plus grande possible, l'intensite des signaux ou du champ However, such an operation, even if it is carried out discontinuously, consumes a great deal of electrical energy, all the more so - that, of course, the greatest possible distance for recognizing or reading badges is sought, the signal or field strength
decroissant justement avec la distance au dispositif fixe. decreasing precisely with the distance to the fixed device.
Un tel fonctionnement est done incompatible avec une alimentation autonome du type pile ou accumulateur, qui rend toutefois le - 2 dispositif fixe plus sur (independent), plus gable et plus facile a installer, Such operation is therefore incompatible with an autonomous supply of the battery or accumulator type, which however makes the - 2 fixed device more secure (independent), more manageable and easier to install,
sans limitation dans le choix des sites. without limitation in the choice of sites.
La presente invention a pour objet de pallier les inconvenients precites, en permettant une lecture et une reconnaissance rapides et gables, avec une consommation energique faible. A cet effet, la presente invention a pour principal objet une unite autonome de reconnaissance, sans contact et a distance, d'un badge, d'une carte ou d'un moyen de lecture portable analogue, caracterisee en ce qu'elle comprend essentiellement, d'une part, un moyen de detection a faible consommation electrique et, d'autre part, un moyen de lecture du badge ou analogue, ayant en fonctionnement une consommation electrique plus importante que le moyen de detection, le moyen de lecture n'etant active ou alimente, le cas echeant seulement pendant une duree limitee determinee, que lorsque le moyen de detection a releve une presence dans son champ de The object of the present invention is to overcome the aforementioned drawbacks, by enabling rapid and gable reading and recognition, with low energy consumption. To this end, the main object of the present invention is an autonomous recognition unit, contactless and remote, of a badge, a card or a similar portable reading means, characterized in that it essentially comprises , on the one hand, a means of detection with low electrical consumption and, on the other hand, a means of reading the badge or the like, having in operation a higher electrical consumption than the means of detection, the means of reading does not being active or powered, the case only occurring during a determined limited time, only when the detection means has detected a presence in its field of
1 5 detection.1 5 detection.
Ainsi, le principe a la base de ['invention consiste a realiser de maniere permanente ou quasi permanente une detection de presence d'un objet, article ou element materiel analogue a proximite de ['unite de reconnaissance, fonction faiblement consommatrice d'energie, et a ne mettre sous tension ou a activer qu'en cas de detection d'un tel element susceptible d'etre un badge de lecture, la fonction de lecture de ladite unite, Thus, the principle underlying the invention consists in carrying out a permanent or almost permanent detection of the presence of an object, article or similar material element near the recognition unit, a function which consumes little energy, and not to energize or activate unless such an element capable of being a reading badge is detected, the reading function of said unit,
fonction fortement consommatrice d'energie. highly energy-consuming function.
L'invention sera mieux comprise, grace a la description ci The invention will be better understood, thanks to the description below
apres, qui se rapporte a un mode de realisation prefere, donne a titre d'exemple non limitatif, et explique avec reference aux dessins schematiques annexes, dans lesquels: la figure 1 represente de maniere synoptique et symbolique une unite selon ['invention, ainsi qu'un badge susceptible d'etre lu et reconnu par cette unite; la fgure 2 est une representation schematique d'un moyen de detection faisant partie d'une unite selon ['invention, et, la figure 3 est une vue partielle en perspective et partiellement ecorchee d'un clavier de programmation comprenant une unite selon ['invention. Comme le montre la figure 1, ['unite de reconnaissance 1 comprend essentiellement, d'une part, un moyen de detection 3 a faible consommation electrique et, d'autres part, un moyen 4 de lecture du badge 2 - 3 - ou analogue, ayant en fonctionnement une consommation electrique plus importante que le moyen de detection 3, le moyen de lecture 4 n'etant active, le cas echeant seulement pendant une duree limitee determinee, que lorsque le moyen de detection 3 a releve une presence dans son champ de detection. Conformement a une caracteristique de ['invention, le moyen de detection 3 consiste en un capteur de proximite (de presence et/ou de mouvement), preferentiellement de type optique ou infrarouge (proche infrarouge). L'invention pourra etre appliquee aussi bien avec des badges after, which relates to a preferred embodiment, given by way of nonlimiting example, and explains with reference to the accompanying diagrammatic drawings, in which: FIG. 1 represents in a synoptic and symbolic manner a unit according to the invention, thus that a badge capable of being read and recognized by this unit; Figure 2 is a schematic representation of a detection means forming part of a unit according to the invention, and, Figure 3 is a partial perspective view and partially broken away of a programming keyboard comprising a unit according to [' invention. As shown in FIG. 1, the recognition unit 1 essentially comprises, on the one hand, a detection means 3 with low electrical consumption and, on the other hand, a means 4 for reading the badge 2 - 3 - or the like , having in operation a higher electrical consumption than the detection means 3, the reading means 4 being active, if necessary only for a determined limited duration, only when the detection means 3 has detected a presence in its field of detection. In accordance with a characteristic of the invention, the detection means 3 consists of a proximity (presence and / or movement) sensor, preferably of the optical or infrared (near infrared) type. The invention can be applied as well with badges
actifs qu'avec des badges passifs.active only with passive badges.
Le moyen de lecture 4 peut comprendre avantageusement un moyen 5 d'activation et d' interrogation emettant, de mani ere continue ou intermittente, un champ magnetique avec une frequence sensiblement identique a la frequence d'accord de l'antenne de reception 7 du badge ou analogue 2, ce des que le fonctionnement normal du moyen de lecture 4 est The reading means 4 can advantageously comprise an activation and interrogation means 5 emitting, continuously or intermittently, a magnetic field with a frequency substantially identical to the tuning frequency of the antenna for receiving the badge or the like 2, as soon as the normal operation of the reading means 4 is
etabli ou retabli.established or restored.
Avantageusement, ledit moyen de lecture 4 comprendra un moyen 5 d'activation et/ou d'interrogation a distance du badge ou analogue 2 et un moyen 6 de reception et d'analyse du signal emis en reponse par ledit badge ou analogue 3, ledit moyen de lecture 4 pouvant etre bascule d'un mode de fonctionnement normal en un mode desactive ou de veille et Advantageously, said reading means 4 will comprise a means 5 of remote activation and / or interrogation of the badge or the like 2 and a means 6 of reception and analysis of the signal sent in response by said badge or the like 3, said reading means 4 which can be switched from a normal operating mode to a deactivated or standby mode and
vice versa.vice versa.
Selon un mode de realisation prefere de ['invention, le badge ou analogue 2 est un badge transpondeur a alimentation par induction comprenant une antenne de reception 7, sous forme de bobine, accordee en frequence et associee a un circuit 8 de reception et de redressement alimentant un circuit integre 9 apte a generer un signal de reponse, eventuellement code, delivre a un circuit 10 d'emission electromagnetique, le moyen 5 d'activation et d/interrogation du moyen de lecture 4 emettant, de maniere continue ou intermittente, un champ electromagnetique de frequence sensiblement identique a la frequence d' accord de l' antenne de reception 7 du badge ou analogue 2 des que le moyen de lecture 4 est active According to a preferred embodiment of the invention, the badge or the like 2 is a transponder badge with induction power supply comprising a receiving antenna 7, in the form of a coil, frequency-tuned and associated with a receiving and rectifying circuit 8 supplying an integrated circuit 9 capable of generating a response signal, possibly coded, delivering to a circuit 10 of electromagnetic emission, the means 5 of activation and d / interrogation of the reading means 4 emitting, continuously or intermittently, a frequency electromagnetic field substantially identical to the tuning frequency of the badge receiving antenna 7 or the like 2 as soon as the reading means 4 is active
que son fonctionnement normal est etabli ou retabli. that its normal operation is established or restored.
On notera que la meme antenne 7 pourra eventuellement servir Note that the same antenna 7 could possibly be used
a la reception et a ['emission.at reception and at transmission.
- 4 Pour aboutir a une mise en ccuvre coherente des moyens de ['invention, les limites du champ de detection du moyen 3 et du champ d'activation et d'interrogation du moyen de lecture 4 seront sensiblement confondues, et la fonction audit moyen 3 consistera a detecter la presence d'un objet dans le champ de lecteur. La limite du champ d'activation et d' interrogation est constituee par la zone de bord peripherique audit champ a partir de laquelle l'energie induite au niveau de l'antenne 7 du badge 2 est suffisante pour permettre la generation et ['emission d'un signal de reponse avec une energie suffisante - 4 To achieve a coherent implementation of the means of the invention, the limits of the detection field of the means 3 and of the field of activation and interrogation of the reading means 4 will be substantially confused, and the function of said means 3 will consist in detecting the presence of an object in the reader field. The limit of the activation and interrogation field is constituted by the edge zone peripheral to said field from which the energy induced at the level of the antenna 7 of the badge 2 is sufficient to allow the generation and [emission of '' a response signal with sufficient energy
pour pouvoir etre capte par ['unite 1. to be able to be picked up by the unit 1.
En vue d'abaisser encore la consommation au niveau de cette In order to further reduce consumption to this level
derriere, le moyen de detection pourra par exemple etre operationnel (ctest- behind, the detection means could for example be operational (ctest-
a-dire etre alimente ou etre commute en mode actif) de maniere intermittente (par exemple par intervalle de ls espaces de 0,5s) et/ou la zone couverte par le champ d'activation ou d'interrogation etre plus petite que celle couverte par le champ de detection de telle maniere que la limite du premier soit en retrait par rapport a celle du second et incluse dans cette derriere. Cette derriere disposition permettra, en outre, de realiser une discrimination entre un objet ou un article se deplacant involontairement au niveau de la zone de bord du champ de detection et les objets ou articles qui ont effectivement un mouvement d'approche en direction de ['unite 1, ou des bornes d'emission/reception des moyens 3 et 4. Cette discrimination pourra etre rendue encore plus efficace en n'autorisant une activation du moyen de lecture 4 qu'apres au moins deux detections successives par le i.e. be powered up or be switched to active mode) intermittently (for example by interval of ls spaces of 0.5s) and / or the area covered by the activation or interrogation field be smaller than that covered by the detection field in such a way that the limit of the first is set back from that of the second and included in this behind. This rear arrangement will also make it possible to discriminate between an object or an article involuntarily moving at the level of the edge of the detection field and objects or articles which actually have an approach movement towards [' unit 1, or transmission / reception terminals of the means 3 and 4. This discrimination can be made even more effective by authorizing an activation of the reading means 4 only after at least two successive detections by the
moyen 3.medium 3.
Selon un mode de realisation prefere mais non limitatif de ['invention, represente aux figures 2 et 3 des figures annexes, le capteur de proximite 3 comporte un emetteur infrarouge 3', tel que par exemple une diode electroluminescente, et un recepteur infrarouge 3", tel que par exemple une photodiode, montes dans une piece 3"' de support et d'orientation, ledit emetteur 3' et ledit recepteur 3", de types directionnels, etant disposes et orientes de maniere que l'axe d'emission E et l'axe de reception R forment les deux cotes d'un triangle sensiblement isocele dont ['angle au sommet determine la distance de detection du capteur de proximite. Par ailleurs, ['unite 1 pourra comprendre un moyen de signalisation lumineux et/ou sonore indiquant que le moyen de detection 3 a detecte un article ou objet dans son champ et que le moyen de lecture 4 a According to a preferred but nonlimiting embodiment of the invention, represented in FIGS. 2 and 3 of the annexed figures, the proximity sensor 3 comprises an infrared emitter 3 ', such as for example a light emitting diode, and an infrared receiver 3 " , such as for example a photodiode, mounted in a 3 "'support and orientation piece, said transmitter 3' and said receiver 3", of directional types, being arranged and oriented so that the emission axis E and the receiving axis R form the two dimensions of a substantially isosceles triangle, the apex angle of which determines the detection distance of the proximity sensor. In addition, the unit 1 may include a light signaling means and / or sound indicating that the detection means 3 has detected an article or object in its field and that the reading means 4 has
ete active.is active.
Un second signal sonore, pouvant presenter deux tonalites ou melodies differentes, sera emis lorsque la phase de lecture sera terminee A second sound signal, which may have two different tones or melodies, will be emitted when the reading phase is finished.
pour indiquer si le badge 2 presente a ete reconnu ou non. to indicate whether the badge 2 present has been recognized or not.
La validation du badge 2 (se reconnaissance comme badge autorise) pourra etre realisee dans ['unite 1 ou de maniere deportee par une The validation of badge 2 (recognition as an authorized badge) can be carried out in unit 1 or in a remote manner by a
unite centrale.central unit.
Les differents elements constitutifs des moyens 3, 4, 5 et 6, ainsi que les composants 7 a 10 portes par le badge 2, vent connus de The different constituent elements of the means 3, 4, 5 and 6, as well as the components 7 to 10 doors by the badge 2, known wind of
l'homme du metier et ne necessitent pas de description supplementaire. skilled in the art and do not require additional description.
Conformement a une application avantageuse de ['invention, ['unite 1 fait partie d'un dispositif de surveillance et de protection contre des intrusions d'au moins un(e) piece ou local, ladite unite 1 etant situee au niveau de ['entree principale ou d'une des entrees donnant acces au local ou a la piece concerne(e) et fonctionnant independamment sur pile(s) , In accordance with an advantageous application of the invention, the unit 1 is part of a surveillance and intrusion protection device of at least one room or local, said unit 1 being located at the level of [' main entrance or one of the entrances giving access to the room or to the room concerned and operating independently on battery (ies),
batterie(s) ou accumulateur(s) propre(s) 11. clean battery (ies) or accumulator (s) 11.
Plus specifquement, ['unite 1 pourra par exemple etre incorporee dans le bo^tier 12 d'un clavier de programmation et de commande d'un systeme d'alarme et reliee fonctionnellement a un moyen de More specifically, the unit 1 may for example be incorporated into the housing 12 of a keyboard for programming and controlling an alarm system and functionally connected to a means of
deverrouillage ou d'activation audit clavier. unlocking or activating said keyboard.
Un tel systeme d'alarme peut notamment etre un dispositif de surveillance et de securite anti-intrusion tel que decrit dans la demande de Such an alarm system can in particular be an anti-intrusion surveillance and security device as described in the request for
brevet francais deposee ce j our au nom de la demanderesse. French patent filed this day in the name of the plaintiff.
L'invention a egalement pour objet un procede de detection et de reconnaissance, sans contact et a distance, d'un badge, d'une carte ou d'un moyen portable de lecture analogue, mettant en aeuvre une unite telle The subject of the invention is also a method of detecting and recognizing, without contact and from a distance, a badge, a card or a similar portable reading means, using such a unit
que decrite ci-dessus.as described above.
Conformement a ['invention, ce procede consiste principalement a generer et a emettre regulierement un signal de detection, de maniere continue ou intermittente, puts, en cas de detection, a generer un champ d'activation a distance d'un badge ou analogue 2 pendant une duree predeterminee, et, enfin, soit a recueillir et a analyser le signal emis en reponse par ledit badge ou analogue 2 detecte et soumis au champ d'activation et a delivrer un signal de lecture predetermine, si le resultat de - 6 ladite analyse est positif, soit, en cas d'absence de reception de signal en reponse pendant ladite duree predeterminee ou de non-reconnaissance du signal emis en reponse par le badge ou analogue 2 detecte, a repeter les According to the invention, this method consists mainly in generating and regularly transmitting a detection signal, continuously or intermittently, puts, in the event of detection, in generating a remote activation field of a badge or the like 2 for a predetermined duration, and, finally, either to collect and analyze the signal sent in response by said badge or the like 2 detected and subjected to the activation field and to deliver a predetermined reading signal, if the result of - 6 said analysis is positive, or, in the absence of reception of a signal in response during said predetermined duration or of non-recognition of the signal sent in response by the badge or the like 2 detected, to repeat the
etapes precedentes pendant un nombre predetermine de repetitions. previous steps during a predetermined number of repetitions.
I1 peut etre prevu qu'en cas de detections repetees pendant un nombre d'iterations predefini et absence de reception ou de reconnaissance consecutive des eventuels signaux emis par le badge ou analogue 2 en reponse a ['influence du champ d'activation, le moyen 5 de generation de champ d'activation soit mis en etat de veille prolonge et/ou un signal It can be foreseen that in the event of repeated detections during a predefined number of iterations and absence of reception or consecutive recognition of any signals emitted by the badge or the like 2 in response to the influence of the activation field, the means 5 of activation field generation is put in prolonged standby state and / or a signal
d'avertissement est emis.warning is issued.
Plus precisement, il peut etre prevu que, en cas de detections repetees, sans reconnaissance consecutive du badge ou analogue 2, le moyen de lecture 4 soit desactive et ne soit reactive que lorsque le moyen de detection 3 experimente une detection apres au moins une phase More precisely, it can be provided that, in the event of repeated detections, without consecutive recognition of the badge or the like 2, the reading means 4 is deactivated and is only reactivated when the detection means 3 experiences detection after at least one phase
d'absence de detection.no detection.
En vue de fiabiliser la detection, en s'affranchissant notamment de rayonnements naturellement presents, le procede peut, en outre, consister a emettre un signal de detection de nature infrarouge par l'intermediaire d'un emetteur 3' adapte, apres avoir mesure le niveau de rayonnement present au niveau du recepteur 3" correspondent faisant partie avec ledit In order to make detection more reliable, in particular by avoiding naturally occurring radiation, the method can also consist in transmitting a detection signal of an infrared nature by means of a suitable 3 ′ transmitter, after having measured the level of radiation present at the level of the 3 "receiver corresponding to said part
emetteur 3' du moyen de detection 3. transmitter 3 'of the detection means 3.
De plus, pour eviter toute perturbation par des signaux parasites, il peut etre prevu d'emettre un signal de detection infrarouge hache ou module et a receptionner uniquement un signal en retour presentant le meme hachage ou la meme modulation, permettant ainsi de In addition, to avoid any disturbance by parasitic signals, it can be planned to emit an ax or module infrared detection signal and to receive only a return signal having the same hash or the same modulation, thus making it possible to
discriminer tout signal emis par une autre source de nature similaire. discriminate against any signal from another source of a similar nature.
Bien entendu, ['invention n'est pas limitee au mode de realisation decrit et represente aux dessins annexes. Des modifications restent possibles, notamment du point de vue de la constitution des divers elements ou par substitution d'equivalents techniques, sans sortir pour Of course, the invention is not limited to the embodiment described and shown in the accompanying drawings. Modifications remain possible, in particular from the point of view of the constitution of the various elements or by substitution of technical equivalents, without leaving for
autant du domaine de protection de ['invention. as much of the protection field of the invention.
-7-7
Claims (14)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0205781A FR2839574B1 (en) | 2002-05-10 | 2002-05-10 | UNIT FOR RECOGNIZING A BADGE OR THE LIKE AND METHOD USING SUCH A UNIT |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0205781A FR2839574B1 (en) | 2002-05-10 | 2002-05-10 | UNIT FOR RECOGNIZING A BADGE OR THE LIKE AND METHOD USING SUCH A UNIT |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2839574A1 true FR2839574A1 (en) | 2003-11-14 |
| FR2839574B1 FR2839574B1 (en) | 2006-06-23 |
Family
ID=29286386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR0205781A Expired - Fee Related FR2839574B1 (en) | 2002-05-10 | 2002-05-10 | UNIT FOR RECOGNIZING A BADGE OR THE LIKE AND METHOD USING SUCH A UNIT |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2839574B1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0453314A2 (en) * | 1990-04-19 | 1991-10-23 | Mitsubishi Denki Kabushiki Kaisha | Non-contact portable carrier |
| EP0727752A2 (en) * | 1995-02-15 | 1996-08-21 | International Computers Limited | Electronic identification system |
| FR2808381A1 (en) * | 2000-04-28 | 2001-11-02 | Jay Electronique Sa | Proximity surveillance object state installation having transmitter/receiving transmitting transponder object placed and having parameter detector/processing circuit and coder/decoder processing signals/oscillating circuit passing |
-
2002
- 2002-05-10 FR FR0205781A patent/FR2839574B1/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0453314A2 (en) * | 1990-04-19 | 1991-10-23 | Mitsubishi Denki Kabushiki Kaisha | Non-contact portable carrier |
| EP0727752A2 (en) * | 1995-02-15 | 1996-08-21 | International Computers Limited | Electronic identification system |
| FR2808381A1 (en) * | 2000-04-28 | 2001-11-02 | Jay Electronique Sa | Proximity surveillance object state installation having transmitter/receiving transmitting transponder object placed and having parameter detector/processing circuit and coder/decoder processing signals/oscillating circuit passing |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2839574B1 (en) | 2006-06-23 |
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