EP0663656B1 - Überwachungsfühler - Google Patents
Überwachungsfühler Download PDFInfo
- Publication number
- EP0663656B1 EP0663656B1 EP95100605A EP95100605A EP0663656B1 EP 0663656 B1 EP0663656 B1 EP 0663656B1 EP 95100605 A EP95100605 A EP 95100605A EP 95100605 A EP95100605 A EP 95100605A EP 0663656 B1 EP0663656 B1 EP 0663656B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sensor
- contact surface
- monitoring
- goods
- circuit
- 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
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Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/02—Mechanical actuation
- G08B13/14—Mechanical actuation by lifting or attempted removal of hand-portable articles
- G08B13/1445—Mechanical actuation by lifting or attempted removal of hand-portable articles with detection of interference with a cable tethering an article, e.g. alarm activated by detecting detachment of article, breaking or stretching of cable
- G08B13/1463—Physical arrangements, e.g. housings
Definitions
- the invention relates to a monitoring sensor for those at risk of theft Goods with a sensor element for monitoring proper contact of the sensor with the securing goods and with a connecting cable for connection of the sensor to a monitoring circuit of an anti-theft system.
- the sensor poses when the proper contact with the goods to be secured electrical measured variable available, the change of the Monitoring circuit can be evaluated as an alarm situation.
- Such monitoring sensors with associated anti-theft systems are mainly used in radio shops and television sets, video devices, telephone systems, etc. are used, in which a large number of exhibition equipment is ready for use and available for customers to use as a test becomes. To corresponding losses of such devices To avoid theft, the devices with the above mentioned surveillance sensors on anti-theft systems connected which, when the measured variable changes, the by breaking proper contact with the Goods are brought about, trigger an alarm and thus one Theft of the secured device or the secured goods prevent effectively.
- Monitoring sensors mentioned at the beginning are from DE 33 02 459 A1 known. These are each via a connecting cable to a monitoring circuit of an anti-theft system connected.
- the sensors have a sensor element to monitor the proper contact of the Sensor with the goods to be secured a variety of special plug connections which integrates a microswitch included, the switching state changes when the Sensor is removed from the goods.
- the change of Switching status is in the form of a measured variable from the monitoring circuit recognized and evaluated as an alarm situation.
- a so-called adhesive sensor has been proposed as it made DE 42 21 686 A1 is known.
- the sensor shows rigid housing, which is glued to the goods, whereby when sticking one on the bottom of the sensor Switch is operated, which is in its initial position returns and thus a measured variable in the form of an interrupted Conductor with infinite resistance for that Monitoring circuit provides if the proper Connection between sensor and goods removed becomes.
- U.S. Patent 4,772,878 shows a similar adhesive probe a rigid housing. It comes with a flat side surface, in which a vertically movable piston is integrated is glued to a product to be secured. A movement of the piston actuates an electrical switch so that an alarm situation is recognizable.
- a monitoring sensor is known from EP-A-O 260 330, which has two carrier foils welded together, between which an electrical conductor track is positioned.
- One of the two carrier foils can be connected to the conductor track glued away side on the goods to be monitored become.
- the carrier films can be torn and thereby the electrical conductor track are interrupted.
- US-A-4,000,488 Another monitoring probe is disclosed in US-A-4,000,488 described. It has a flexible contact surface element in Form a paper strip on which an electrical Conductor is printed and that by means of an adhesive layer can be glued to the goods to be secured. Is trying to separate the paper strip from the goods this will result in an interruption in the conductor track.
- Such sensors can be easily attached to the goods stick on. However, it has been shown that a very careful Detachment of the sensors from the goods to be monitored not reliably trigger an alarm in all cases leads.
- the object of the invention is a general use Propose monitoring sensor in a flat design manufactured and easily with curved or curved Areas for proper and permanent contact can be connected and largely tamper-proof is.
- the flexibility of the contact surface element allows one exact adjustment of the monitoring sensor to the surface the goods to be secured. Therefore, a large area Adhesive contact between the sensor and the goods to be secured that is very durable and prevents false alarms.
- the monitoring sensor can also be used Secure goods without flat outer surfaces, as the sensor is attached to each any outer contour is adaptable.
- the contact surface element and the sensor element train very flat, so that there is a very low Total height of the monitoring sensor results.
- a preferred embodiment is characterized in that that the contact surface element is a flat side of the sensor forms, and that the sensor element in edge areas of the Contact surface element extends.
- the contact surface element can also have a second one Sensor element, such as a microswitch, e.g. in the field of Center of the contact surface of the contact surface element for monitoring of proper contact with the goods his. This then results in a particularly high level of security against attempts at manipulation. Such a measure can especially appropriate when securing very high-priced goods his.
- a second one Sensor element such as a microswitch
- a particularly safe monitoring of proper contact of feelers and goods over the entire contact area and the sensor is also of low construction, that the sensor element with the contact surface element deformable to adapt to the shape of the goods and essentially running parallel to the contact surface of the contact surface element is arranged.
- the universal usability of the sensor is supported by that the sensor element with the contact surface element is adaptable to the shape of the goods.
- This is the Sensor element preferably also designed to be flexible especially in the case of a considerable area the sensor element a very flexible overall To be able to realize sensors, so that the contact surface of the Contact surface element optimal to any shape or surface a product to be secured is adaptable.
- the one parallel to the contact surface of the contact surface element The arrangement of the sensor element allows a particularly flat one Training and thus a high flexibility of the sensor.
- the sensor element is preferably directly on the contact surface element arranged or even at least partially poured into this. This results in an immediate transfer any change in shape or force acting on the contact surface element experiences on the sensor element. Accordingly becomes a particularly reliable detection of theft attempts enables.
- the sensor element can be a very compact shape compared to flat training of the contact surface element.
- the flexible contact surface element For the production of the flexible contact surface element a plastic material or a rubber-elastic material used, this allows a particularly good adaptability of the contact surface element to curved or curved Surfaces of the goods to be secured.
- the housing material a Shore hardness of 20 to 50 and especially 25 up to 40. This results in a good flexibility of the Sensor with sufficient protection of the arranged in the housing Components such as the sensor element.
- a particularly preferred embodiment is characterized by this from that the sensor has a flexible housing, and that the contact surface element is integrally formed with the housing is.
- the housing can also be made in several parts.
- the housing is preferably very flat, so that in addition to a low overall height, a large one Flexibility of the sensor is guaranteed. Still leads the flat training for a generous dimensioning the contact area of the contact surface element when the contact area is formed by a flat side of the housing, so that a particularly secure connection with the one to be secured Goods is enabled.
- the contact surface element comprises an adhesive layer for attachment of the sensor on the goods.
- the adhesive layer forms a generously dimensioned adhesive surface, by means of which the Contact surface element can be attached directly to the goods to be secured is.
- the entire is preferably the same used for the adhesive goods, a particularly durable and permanent connection of the sensor with the goods.
- the adhesive layer provided enables a very simply attach the monitoring sensor to the one to be secured Goods without separately provided fasteners required are.
- the sensor element between the adhesive layer and the contact surface element arranged is.
- the sensor element is used in particular by the Adhesive layer and the contact surface element completely enclosed, so that this one protects the sensor element Form cladding.
- a housing for receiving the Sensor element is eliminated, and it is particularly low building training of the sensor possible. Accordingly results a very simple and inexpensive manufacture of the feeler.
- a particularly simple implementation of the sensor element formed measuring loop is characterized by that the sensor element is an electrical, in particular metal foil-like Includes conductor loop.
- An electrical conductor loop has the advantage that an interruption of the the conductor loop formed circuit with a very little effort is detectable.
- the especially metal foil-like Formation of the conductor loop leads next to one inexpensive manufacturability at a particularly flat Construction of the sensor element.
- the conductor loop can this also by an evaporated metal layer or a very thin wire.
- predetermined breaking points be provided for an intended interruption the conductor loop when the sensor is detached to ensure from the adhesive layer.
- a particularly simple contacting of the conductor loop is achieved in that at least two contact points in the contact surface element are integrated. This will enables a very simple production, for example by successively on the contact surface element, the conductor loop and the adhesive layer are applied, the electrical contact to the conductor loop due to concern the contact points is ensured. However, one can Contacting takes place via connecting wires.
- the monitoring sensor according to the invention can with a optical display for the operating status and function of the sensor. This is particularly useful the very small-sized LEDs.
- the optical display is preferably operated in the function manipulating the connection of Goods and monitoring sensor permanently, i.e. until deleted of the alarm by authorized personnel. This makes it easier for the sales staff in the event of an alarm, the goods locate who attempted theft has been. If necessary, can also very quickly proper contact between the goods and the sensor become.
- the visual display becomes like this operated that they have an optical signal, such as a Flashing signal, properly on the goods to be secured attached condition sends out to potential thieves on the Theft surveillance to make people aware of and Deter theft.
- an optical signal such as a Flashing signal
- the visual display can of course also used to communicate other information, such as e.g. for the visual display for a properly new established connection of the sensor with the monitoring circuit. For this purpose, for example, a brief flashing can occur the advertisement is sufficient.
- connection cable forces acting on the flexible contact surface element largely decoupled, so that by one movement the connection cable, for example during an assessment of the goods to be secured by a customer, none or only minimal forces are exerted on the sensor element.
- the cable connection area, the rigid Connection part and the flexible contact surface element with a be formed in one piece casing.
- the monitoring sensor according to the invention with a novel monitoring circuit to be described below can the measured variable of the monitoring circuit supplied by the sensor element without preparation and conversion directly to Will be provided. Processing and evaluation the measured variable then takes place within the monitoring circuit the anti-theft system.
- a circuit is integrated in the sensor, which is the measured variable supplied by the sensor element for the Monitoring circuit prepared.
- the task of this in the Sensor integrated circuit is one for a conventional one Anti-theft system usable output signal to deliver, for example, a digital signal can be provided.
- a preferred embodiment is distinguished characterized in that the circuit is an evaluation circuit for Preparation of the measured variable of the sensor element and its conversion into a digital value and a memory for temporary storage of the digital value, the circuit Measured variable prepared and closed at specified time intervals converts to a digital value and a signal indicating an alarm outputs to the monitoring circuit when the cached Digital value from a later digital value deviates from a predeterminable value. So is the monitoring sensor particularly flexible, i.e. independent of Shape of the flexible contact surface element and therefore regardless one depending on the shape of a product to be secured Initial value of the measured variable supplied by the sensor element.
- the circuit can of course can also be installed in a plug contact with the connecting cable of the sensor to the anti-theft system can be connected.
- the invention further relates to an anti-theft system with a monitoring sensor of the above Kind and with a monitoring circuit that an evaluation circuit for processing the measured variable of the sensor element and its conversion into a digital value and a memory for temporarily storing this digital value.
- the monitoring circuit is the one supplied by the sensor element Prepare the measured variable at specified intervals and convert to a digital value and trigger an alarm, if the cached digital value is from a later one received digital value deviates by a predetermined value. In the simplest case, storing a single-digit number is sufficient Digital value.
- the alarm triggering gives the advantage of minimal changes the measured variable of the sensor element, such as, for example by rough handling with the invention Monitoring sensor secured goods are caused cannot be taken into account when triggering the alarm, so that only in the event of serious manipulation of the contact between the monitoring sensor and the goods Alarm is triggered. It can also be provided here be the predetermined value from the operator is adjustable so that the system in its sensitivity can be adapted to the respective application.
- the evaluation circuit mentioned has the advantage on that sensor with different sensor elements, the for example, very different electrical resistance values as measured quantities, each to the same type of Monitoring circuit can be connected.
- the anti-theft system explained above can work with extremely small monitoring sensors and essentially comes with a single type of monitor probe because the monitoring sensor according to the invention practically satisfactory with every product to be secured work together and on this without the functionality prevent the goods from being attached.
- the monitoring sensors are suitable for mounting Goods intended with solid surfaces.
- the Monitoring sensor whose sensor element only when detached the sensor of a secured goods a significant change the measured variable shows how this is the case, for example, with the arranged between the contact surface element and the adhesive layer Conductor loop is the case, even goods with flexible surfaces to secure.
- the monitoring sensors according to the invention also interfere the appearance of the goods to be secured in none Way, since they can be made very unobtrusive, and are therefore also usable in cases where there is an optical particularly demanding presentation of the goods arrives.
- Anti-theft system comprises an activation circuit, the first time a connection is seized with a Connection cable of a monitoring sensor that the connection assigned monitoring circuit activated, whereby these at a predetermined time interval for activation for the first time the measured variable of the sensor is processed and Cached memory.
- the predetermined time interval to Activation in which the measured variable of the sensor is processed, converted and cached in memory, so chosen be that a secure attachment of the sensor to the Goods are possible and thus a constant measured variable of the sensor achieved in the condition properly associated with the goods before a digital value is saved.
- FIG. 1 shows an anti-theft system according to the invention 10, the at least one, but preferably several monitoring circuits 12 and a common alarm device 14 has.
- each monitoring circuit 12 To each monitoring circuit 12 is in each case one Plug connection 16 and a connecting cable 18 a monitoring sensor 20 connectable. 1 is a sensor 20 with the monitoring circuit 12 via the Connection cable 18 connected and also to be secured Item 22 attached.
- the assigned monitoring circuit 12 detected and a signal to the alarm device 14 of the anti-theft system 10 issued.
- the Alarm device 14 then shows the alarm, for example by an acoustic signal or a visual display.
- Fig. 2 shows a first embodiment of an inventive Feeler 20.
- This has a flexible, very flat Housing 24 made of a rubber-elastic material.
- the housing 24 has an integrated contact surface element 26 a flexible, smooth contact surface 28, the one Flat side of the housing 24 forms.
- the housing 24 is in the essentially as a flat cuboid with rounded edges educated.
- the contact area 28 corresponds to a base area of the cuboid.
- the housing 24 can also have the shape a flat section of a circular cylinder or one elliptical cylinder or some other shape. It is important that a flexible contact surface element 26 is formed becomes.
- a rigid connecting part 30 is cast into the housing 24, to which the connecting cable 18 is connected.
- the Connection part serves on the one hand a fixed mechanical Connection of the connecting cable 18 with the sensor 20 as Strain relief and on the other hand an electrical connection of the sensor 20 to the connecting cable 18. Since the connecting part 30 is completely covered by the housing 24, is also the connecting cable 18 partially cast into the housing 24 and so mechanically connected to it.
- the connecting cable 18 has one at its free end schematically indicated connector 32 to form the connector 16 and for connecting the sensor 20 to a monitoring circuit 12 in the anti-theft system 10 on.
- the connecting part 30 is very flat and runs with its main plane of extension essentially parallel to the contact surface 28.
- the connecting part 30 has two contact points 34 in the form of contact pins each through the contact surface element 26 to the contact surface 28 extend and possibly something over the contact surface 28 are also increased.
- the contact points 34 are used for electrical connection of a sensor element 36 arranged on the contact surface 28.
- the sensor element 36 is parallel to the flat one Contact surface element 26 is arranged and is in the Fig. 2 embodiment shown flat on the contact surface 28 on.
- the conductor loop 38 is here through a metal foil strip formed from aluminum which is spaced and about running parallel to the edge of the contact surface 28 of the contact surface element 26 is arranged.
- the conductor loop 38 3 in the embodiment shown in FIG essentially an open U and covered with the free Leg ends each have one of the contact points 34 of the connecting part 30th
- the contact points 34 By the conductor loop 38 resting on the contact points 34 there is electrical contacting of the conductor loop 38. To make good contact between the contact points 34 and the conductor loop 38 are to be ensured the contact points 34 preferably over the contact surface 28 slightly raised. Furthermore, the surfaces are the contact points 34 are preferably coated with gold, a low contact resistance to the conductor loop 38 to ensure.
- the conductor loop 38 is replaced by a corresponding evaporated metal sheet, e.g. made of silver, which also on the contact points 34 for electrical contacting may have evaporated.
- the contact points 34 can the conductor loop 38 or the measuring loop can be applied to the adhesive layer 42.
- the measuring loop or conductor loop 38 preferably before attaching the adhesive layer 42 to the contact surface element 26 facing the contact surface 28 Side of the adhesive layer 42 is applied to a good Adhesive bond between the measuring loop and the adhesive layer 42 to ensure.
- each of the connecting cable 18 a connecting line 40 to the contact points 34 leads so that a closed circuit through the conductor loop 38 and via the contact points 34, the connecting lines 40 and the connecting cable 18 for the monitoring circuit 12 can be formed.
- Fig. 2 can be seen that the sensor element 36 on the Contact surface 28 of the contact surface element 26 with a Adhesive layer 42 is completely covered. This is both liable on the contact surface 28 as well as on the sensor element 36.
- the illustration was used for reasons of illustration this adhesive layer 42 is omitted.
- the adhesive layer 42 is by a double-sided adhesive tape formed on its the contact surface element 26 facing adhesive surface 44 by a not shown Protective film up to an attachment to the to be secured Goods 22 is covered.
- the housing 24 is so flat that it is identical to the contact surface element 26.
- the electric one Sensor element 36 can then be connected by that the connecting cable 18 between the contact surface element 26 and the adhesive layer 42 or alone in the latter glued and connected to the sensor element 36 is.
- An extremely small thickness of the sensor 20 can thus be of just a few millimeters.
- the sensor 20 is used to manufacture the proper Contact of sensor 20 and product 22 with the Adhesive surface 44 over the entire surface, preferably the bottom, the goods 22 glued. The remains in the substantially parallel arrangement of the sensor element 36 to Contact surface element 26 even when the sensor is curved 20 received.
- the first connection of the sensor 20 to the monitoring circuit 12 is through an activation circuit 46 of the monitoring circuit 12 recognized. This also switches a predetermined or adjustable delay time subsequent evaluation circuit 48 armed. This means that the evaluation circuit 48 after the delay time via the connector 16 and the connecting cable 18th connected sensor 20 with a view to a proper Contact with the goods 22 as well as the electrical connection to the sensor 20 on other manipulation attempts supervised. This is done, for example, by the sensor element 36 of the sensor 20 current flowing or that of the sensor element 36 electrical resistance formed as a measured variable evaluated by the evaluation circuit 48. This changes the Measured variable into a digital value, which after activation by the activation circuit 46 in a memory 50 is cached.
- the adhesive layer 42 remains with the sensor element 36 or the conductor loop 38 on the goods 22 glue.
- the contact surface element can be pulled off 26 from the adhesive layer 42 Adhesive layer 42 on the adhesive surface 44 a higher adhesive or Adhesive force than with respect to the contact surface element 26. Accordingly, when the sensor 20 is removed from the goods 22 the measuring loop formed by the sensor element 36, like the electrical conductor loop 38, interrupted. Possibly can use the measuring loop for defined interruption additional predetermined breaking points, such as tapers or perforations, exhibit.
- the interruption leads to a significant change in the Measured variable, what from the evaluation circuit 48 as a Alarm situation is detected.
- the evaluation circuit 48 gives in this case an alarm triggering signal to the alarm device 14 out.
- Changes are also made by the evaluation circuit 48 the measured variable, which is based on manipulations on the connecting cable 18 or on the connector 16 can be attributed, such as short-circuiting or breaking the connection, recognized accordingly and an alarm is triggered.
- the evaluation method described represents a preferred one Process variant. However, another evaluation is also for example using only analog Measured values, possible. There is also the possibility of initial value stored in the memory 50 when the Measured variable regularly within the permitted tolerance range to the current measured value by saving again track. So slow changes in measured values, such as they are caused, for example, by temperature influences, are taken into account without triggering a false alarm becomes.
- the contact points 34 can also be made by contact springs be educated. These are arranged and are for example from the contact surface element 26 or from Connection part 30 held so that a spring section, like a free end, in the unloaded state over the contact surface pops out.
- the adjacent electrical conductor loop 38 is due to the spring force on the contact springs then particularly securely electrically contacted, even if the conductor loop 38 is a slight distance to the contact surface 28, for example due to Manufacturing tolerances should have.
- the measuring loop or the conductor loop 38 one or more electrical connections that are also rectilinear can be on the contact surface 28 or on the Form adhesive layer 42, which when sensor 20 is removed of a product 22 to be secured by the contact surface element 26 releasing adhesive layer 42 at least partially to be interrupted.
- the intended interruption of the electrical connection can also be forced that the conductor loop 38 in particular in a film-like Training has cuts, incisions or punchings, which make tearing easier.
- the adhesive layer 42 in particular with the measuring loop can already be pre-cut or punched so that the Adhesive layer 42 when the sensor 20 is detached from one securing goods 22 is torn, so that sections of the Adhesive layer 42, which also carry sections of the measuring loop, remain on the goods to be secured 22. So it turns out a particularly reliable interruption of the measuring loop and a correspondingly reliable detection of manipulations on sensor 20.
- the monitoring sensor 20 according to the invention according to the second The embodiment according to FIG. 4 in turn has a one rubber-elastic material manufactured housing 24, which forms an integrated, flexible contact surface element 26.
- the housing 24 is essentially flat, wherein the contact surface element 26 in the state in which the sensor 20 is not attached to a product 22, essentially one flat contact surface 28 forms.
- a sensor element 36 is essentially in the housing 24 arranged parallel to the contact surface element 26.
- the sensor element 36 is in turn via a rigid connecting part 30 inside the housing 24 to the connecting cable 18 of the sensor 20 connected.
- a circuit 52 is integrated in the rigid connecting part 30, which will be described in more detail later.
- Farther is on the connector 30 an optical display 54 in the form of a Light-emitting diode arranged on the contact surface element 26 facing away from the sensor 20, the housing 24 penetrated and visible.
- an adhesive layer 42 is arranged, which is a fastening of the sensor 20 on the goods 22 to be secured.
- the sensor element is located 36 preferably directly on that facing away from the contact surface 28 Side of the contact surface element 26, wherein in 4 a certain distance for reasons there is clarity. Because of this assignment each of the sensor element 36 to the contact surface element 26 Change in shape of the flexible contact surface element 26 a Change in shape or force acting on the sensor element 36 result. This leads to a change accordingly a measured variable, in particular by the electrical Resistor or a current flowing through it is formed.
- the sensor 20 according to the second embodiment is also used Securing a product 22 attached to it by proper Contact between sensor 20 and product 22 is thereby established is that the sensor 20 with its adhesive layer 42nd glued all over to a surface of the goods 22 and so it is firmly connected. Because of the flexible Formation of the sensor 20 can be the contact surface element 26 any curvature of the surface of the goods 22 adjust so that it is a highly resilient and therefore safe Attachment of the sensor 20 to the product 22 can be made.
- the senor 20 is connected to a monitoring circuit 12 of the anti-theft system 10 on the Connection cable 18.
- Fig. 5 shows schematically the electrical structure and connection of the sensor 20 according to the second embodiment represents a monitoring circuit 12.
- the sensor element 36 Rigidly connected to the circuit 52 via connecting lines 40 Connection part 30 connected. These components are all in the flexible housing 24 of the sensor 20 arranged, preferably even poured into this.
- the circuit 52 is supplied with power by the connecting cable 18 and the connector 16 connected Monitoring circuit 12 in the anti-theft system 10th
- the circuit 52 has an evaluation circuit 48 with a allocated memory 50 which has the same functions as in the method variant described with reference to FIG. 1 To run.
- the evaluation circuit prepares accordingly 48 a measured variable of the sensor element 36, for this purpose especially the electrical resistance or a current in Question arises so that tampering with the sensor 20, in particular a change in shape of the contact surface element 26 at Detachment of the sensor 20 from the goods 22 to be secured, detected become.
- the evaluation circuit 48 converts the Measured variable in a digital value that in the assigned Memory 50 is cached. Then the Measured variable regularly measured and converted into a digital value, which is compared with the cached digital value becomes. If one exceeds a predetermined amount Deviation is determined, the evaluation circuit gives 48 a signal that indicates an alarm situation. This signal is transmitted via the connecting cable 18 and the plug connection 16 to the monitoring circuit 12 spent.
- the monitoring circuit 12 has a detector circuit 58 on which the output signal from the evaluation circuit 48th receives and detects an alarm situation. In case of a Alarm situation, the detector circuit 58 gives an alarm signal to the alarm device 14 for triggering the alarm. In addition the detector circuit 58 can provide the electrical connection to the Monitor circuit 52 in sensor 20 and if there are any Manipulations, such as shorting or breaking the Connection, output an alarm signal to the alarm device 14.
- an activation circuit 46 can be arranged, the automatic arming after establishing the plug connection 16 to a sensor 20 causes.
- This activation circuit 46 for example the electrical supply to the circuit 52 only switch on after a preselectable delay time, until then attaching the sensor 20 to the to be secured Goods 22 with a resulting change the measured variable of the sensor element 36 is possible without a False alarm is triggered.
- the display 54 connected to the circuit 52 becomes at a proper connection of the sensor 20 with the Monitoring circuit 12 and in the armed state the monitoring circuit 12 switched on briefly. in the display 54 then remains off during normal operation. Is the proper contact of goods 22 and sensor 20 even briefly lost, the display 54 becomes permanent controlled and emits a flashing signal, for example, until the monitoring circuit 12 by authorized personnel reset and the alarm situation is thus ended.
- the visual display 54 It is also possible for the visual display 54 to be in focus Condition on the goods 22 flashes regularly to indicate potential To deter thieves.
- the integrated circuit 52 can, as described above, the measured variable of the sensor element 36 itself to a change check and display the monitoring circuit 12, whether the monitoring sensor 20 the normal state of a proper Detects contact of sensor 20 and goods 22, or whether there is a situation where the proper Contact between sensor 20 and goods 22 is canceled or was.
- the circuit 52 can, for example, also a digital value representing the current measured variable of the sensor element 36 reflected, the monitoring circuit 12 available put.
- the connecting cable 18 can generally be cast onto the housing 24 be by a strain relief, such as the connector 30, be connected to the housing 24 or to the latter may be pluggable in exceptional cases.
- the connecting cable 18 two, three or also be multi-core, depending on the range of functions, which is implemented in the monitoring sensor 20 itself.
- a two-core connecting cable 18 is sufficient. This may also be sufficient if the integrated circuit 52 Complete evaluation of the sensor element 36 is available standing measured variable and for the monitoring circuit 12 represents the correct contact Signal and a breaking of the proper contact representing signal available.
- the sensor elements 36 in particular in the edge region of the contact surface element 26 be arranged to when the probe 20 is detached from one securing goods 22 the particularly strong change in shape to register the contact surface element 26 in the edge region. This leads to a particularly reliable detection of attempts at theft.
- the monitoring sensor 20 itself has no rigid structure have to rule out accidental false alarms. Rather, the sensor housing 24 can be very flexible overall are trained and maintains a stable position in that it is glued to a rigid surface in firm contact. Thus, even with very flexible, especially rubber-elastic Sensor housings 24 thin thickness false alarms be safely excluded. But it is also possible Sensor 20 with its flexible contact surface element 26 to attach a flexible product 22 when the sensor element 36, for example, as one between the adhesive layer 42 and the flexible surface loop arranged in the contact surface element 26 38 is formed, the measurement variable provided only when the sensor 20 is removed from the Goods 22 changes significantly.
- the flexible design of the sensor 20 that a better connection between the sensor 20 and the goods 22 can be produced, since when the sensor 20 is stuck on, the pressure force on the goods 22 not on the whole Contact surface 28 is distributed, but in some areas higher pressure arises. If necessary, the sensor 20 is on different positions several times by one operator pressed with the finger on the goods to be secured 22. So the result is a much stronger and more durable adhesive contact between the sensor 20 and the goods to be secured 22 than with sensors with a rigid housing.
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- General Physics & Mathematics (AREA)
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Description
- Fig. 1
- eine schematische Darstellung einer erfindungsgemäßen Diebstahlsicherungsanlage;
- Fig. 2
- eine Schnittansicht einer ersten Ausführungsform eines erfindungsgemäßen Überwachungsfühlers;
- Fig. 3
- eine Ansicht des Fühlers nach Fig. 2 von unten;
- Fig. 4
- eine Schnittansicht einer zweiten Ausführungsform eines erfindungsgemäßen Überwachungsfühlers;
- Fig. 5
- eine schematische Darstellung einer in den Fühler nach Fig. 4 integrierten Schaltung mit einem angeschlossenen Verbindungskabel;
Claims (11)
- Überwachungsfühler für diebstahlgefährdete Waren (22) mit einem Sensorelement (36) zur Überwachung eines ordnungsgemäßen Kontaktes des Fühlers (20) mit der Ware (22), mit einem Verbindungskabel (18) zum Anschließen des Fühlers (20) an eine Überwachungsschaltung (12) einer Diebstahlsicherungsanlage (10), wobei der Fühler (20) beim Aufheben des ordnungsgemäßen Kontaktes mit der Ware (22) eine Meßgröße zur Verfügung stellt, deren Änderung von der Überwachungsschaltung (12) als Alarmsituation auswertbar ist, und mit einem flexiblen Kontaktflächenelement, welches bei ordnungsgemäßem Kontakt von Fühler (20) und Ware (22) flächig an der Ware (22) anliegt und eine Haftschicht (42) zur Befestigung des Fühlers (20) an der Ware (22) umfaßt, wobei das Sensorelement (36) derart ausgebildet ist, daß eine Krafteinwirkung auf das Kontaktflächenelement (26) und/oder eine Formänderung des Kontaktflächenelements (26) beim Aufheben des ordnungsgemäßen Kontaktes von Fühler (20) und Ware (22) in einer Änderung der Meßgröße resultiert, und wobei das Sensorelement (36) zwischen der Haftschicht (42) und dem Kontaktflächenelement (26) angeordnet ist,
dadurch gekennzeichnet, daß das Kontaktflächenelement (26) aus Kunststoff oder aus einem gummielastischen Material gefertigt ist, daß die Haftschicht (42) stärker an der Ware (22) als an dem Kontaktflächenelement (26) haftet, und daß das Sensorelement (36) an der Haftschicht (42) haftet, so daß beim Aufheben des ordnungsgemäßen Kontaktes von Fühler (20) und Ware (22) das Sensorelement (36) zumindest teilweise mit der Haftschicht (42) von dem Kontaktflächenelement (26) getrennt und dadurch eine vom Sensorelement (36) gebildete Meßschleife unterbrochen wird. - Überwachungsfühler nach Anspruch 1, dadurch gekennzeichnet, daß das Kontaktflächenelement (26) eine Flachseite des Fühlers (20) bildet, und daß sich das Sensorelement (36) in Randbereiche des Kontaktflächenelements (26) erstreckt.
- Überwachungsfühler nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Sensorelement (36) mit dem Kontaktflächenelement (26) zur Anpassung an die Gestalt der Ware (22) verformbar und im wesentlichen parallel verlaufend zu der Kontaktfläche (28) des Kontaktflächenelements (26) angeordnet ist.
- Überwachungsfühler nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß das Sensorelement (36) eine elektrische, insbesondere metallfolienartige Leiterschleife (38) umfaßt.
- Überwachungsfühler nach Anspruch 4, dadurch gekennzeichnet, daß die Leiterschleife (38) über mindestens zwei in das Kontaktflächenelement (26) integrierte Kontaktpunkte (34) kontaktiert ist.
- Überwachungsfühler nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß der Fühler (20) eine optische Anzeige (54) für den Betriebszustand des Fühlers (20) umfaßt.
- Überwachungsfühler nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß der Fühler (20) ein starres Anschlußteil (30) für das Verbindungskabel (18) umfaßt.
- Überwachungsfühler nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß in den Fühler (20) eine Schaltung (52) integriert ist, die eine vom Sensorelement (36) gelieferte Meßgröße für die Überwachungsschaltung (12) aufbereitet.
- Überwachungsfühler nach Anspruch 8, dadurch gekennzeichnet, daß die Schaltung (52) eine Auswerteschaltung (48) zur Aufbereitung der Meßgröße des Sensorelements (36) und zur Wandlung in einen Digitalwert sowie einen Speicher (50) zum Zwischenspeichern des Digitalwerts umfaßt, wobei die Schaltung (52) die Meßgröße in vorgegebenen Zeitabständen aufbereitet und zu einem Digitalwert wandelt und ein Alarm anzeigendes Signal an die Überwachungsschaltung (12) ausgibt, wenn der zwischengespeicherte Digitalwert von einem späteren Digitalwert um einen vorgebbaren Wert abweicht.
- Diebstahlsicherungsanlage mit einem Überwachungsfühler nach einem der voranstehenden Ansprüche und mit einer Überwachungsschaltung (12), die eine Auswerteschaltung (48) zur Aufbereitung der Meßgröße des Sensorelements (36) und deren Wandlung in einen Digitalwert sowie einen Speicher (50) zum Zwischenspeichern des Digitalwerts umfaßt, wobei die Überwachungsschaltung (12) die vom Sensorelement (36) gelieferte Meßgröße in vorgegebenen Zeitabständen aufbereitet und zu einem Digitalwert wandelt und eine Alarmauslösung veranlaßt, wenn der zwischengespeicherte Digitalwert von einem späteren Digitalwert um einen vorgebbaren Wert abweicht.
- Diebstahlsicherungsanlage nach Anspruch 10, dadurch gekennzeichnet, daß die Diebstahlsicherungsanlage (10) einen Aktivierungsschaltkreis (46) umfaßt, der bei einem erstmaligen Belegen eines Anschlusses mit einem Verbindungskabel (18) eines Überwachungsfühlers (20) die dem Anschluß zugeordnete Überwachungsschaltung (12) aktiviert, wobei diese in einem vorgegebenen zeitlichen Abstand zur Aktivierung erstmals die Meßgröße des Fühlers (20) aufbereitet, wandelt und in dem Speicher (50) zwischenspeichert.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE29521955U DE29521955U1 (de) | 1994-01-18 | 1995-01-18 | Überwachungsfühler |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE4401325 | 1994-01-18 | ||
DE4401325A DE4401325C1 (de) | 1994-01-18 | 1994-01-18 | Überwachungsfühler |
Publications (2)
Publication Number | Publication Date |
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EP0663656A1 EP0663656A1 (de) | 1995-07-19 |
EP0663656B1 true EP0663656B1 (de) | 2001-11-21 |
Family
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Family Applications (1)
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EP95100605A Expired - Lifetime EP0663656B1 (de) | 1994-01-18 | 1995-01-18 | Überwachungsfühler |
Country Status (5)
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US (1) | US5574430A (de) |
EP (1) | EP0663656B1 (de) |
AT (1) | ATE209384T1 (de) |
CA (1) | CA2140472C (de) |
DE (2) | DE4401325C1 (de) |
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DE4401325C1 (de) * | 1994-01-18 | 1995-06-08 | Reinhold Ott | Überwachungsfühler |
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DE19605052A1 (de) * | 1996-02-12 | 1997-08-14 | Ott Reinhold | Überwachungsfühler und Anlage zur Diebstahlsicherung von Waren |
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-
1994
- 1994-01-18 DE DE4401325A patent/DE4401325C1/de not_active Expired - Fee Related
-
1995
- 1995-01-17 US US08/374,143 patent/US5574430A/en not_active Expired - Lifetime
- 1995-01-18 CA CA002140472A patent/CA2140472C/en not_active Expired - Fee Related
- 1995-01-18 DE DE59509853T patent/DE59509853D1/de not_active Expired - Lifetime
- 1995-01-18 AT AT95100605T patent/ATE209384T1/de not_active IP Right Cessation
- 1995-01-18 EP EP95100605A patent/EP0663656B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
CA2140472A1 (en) | 1995-07-19 |
EP0663656A1 (de) | 1995-07-19 |
CA2140472C (en) | 2000-07-11 |
DE4401325C1 (de) | 1995-06-08 |
DE59509853D1 (de) | 2002-01-03 |
ATE209384T1 (de) | 2001-12-15 |
US5574430A (en) | 1996-11-12 |
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