EP0316872B1 - Transmetteur d'alarme - Google Patents

Transmetteur d'alarme Download PDF

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Publication number
EP0316872B1
EP0316872B1 EP88119028A EP88119028A EP0316872B1 EP 0316872 B1 EP0316872 B1 EP 0316872B1 EP 88119028 A EP88119028 A EP 88119028A EP 88119028 A EP88119028 A EP 88119028A EP 0316872 B1 EP0316872 B1 EP 0316872B1
Authority
EP
European Patent Office
Prior art keywords
signal
distributor
circuit
alarm
monitoring unit
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
EP88119028A
Other languages
German (de)
English (en)
Other versions
EP0316872A3 (en
EP0316872A2 (fr
Inventor
Reiner Künzel
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.)
Fritz Fuss GmbH and Co
Original Assignee
Fritz Fuss GmbH and Co
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.)
Filing date
Publication date
Application filed by Fritz Fuss GmbH and Co filed Critical Fritz Fuss GmbH and Co
Priority to AT8888119028T priority Critical patent/ATE104782T1/de
Publication of EP0316872A2 publication Critical patent/EP0316872A2/fr
Publication of EP0316872A3 publication Critical patent/EP0316872A3/de
Application granted granted Critical
Publication of EP0316872B1 publication Critical patent/EP0316872B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G08B13/08—Mechanical actuation by opening, e.g. of door, of window, of drawer, of shutter, of curtain, of blind
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/04—Mechanical actuation by breaking of glass

Definitions

  • the invention relates to an alarm arrangement with a monitoring unit arranged on a movable glass pane or door to be monitored, with an alarm transmitter and with a fixed distributor which is inductively coupled to the transmission unit in the desired position of the glass pane or door and which is connected to a signaling center.
  • this arrangement has the disadvantage that the current flow in the coil of the distributor also depends on other sizes, such as the width of the air gap between the cores facing one another. This air gap can change, for example due to an expansion of the window depending on the season to change.
  • the coupling between the monitoring unit and the distributor is very good, because with a poorer coupling a change in the coil resistance of the monitoring unit in the current flow of the distributor coil can hardly be measured.
  • the coil current of the distributor coil is further influenced by the temperature drift of electrical components in the distributor.
  • separate transmission means for the energy supply and information are required.
  • the load that is to say the current flowing in the distributor coil
  • the distributor coil of the resonant circuit of the distributor operates as a transmitter and induces an alternating voltage in the coil of the resonant circuit of the monitoring unit.
  • the first oscillator arranged in the distributor generates a high-frequency signal which lies in the range of the resonance frequency of the resonant circuit of the distributor and the monitoring unit. After a little more than half a cycle period, the clock-controlled toggle switch is switched to the second switch position.
  • the oscillating circuit of the monitoring unit When the alarm device is in the normal state, the oscillating circuit of the monitoring unit continues to oscillate for a short time induces an AC voltage in the resonant circuit of the distributor, which is fed to the signal evaluation circuit which is now switched on.
  • the signal evaluation circuit interprets this reverberation as an acknowledgment signal, which characterizes a target position of the monitoring unit relative to the distributor and a normal state of the alarm transmitter.
  • the oscillating circuit of the monitoring unit can, for example, be interrupted or short-circuited, as a result of which the oscillating circuit of the monitoring unit and thus the acknowledgment signal are prevented.
  • the acknowledgment signal also remains off if the monitoring unit is not in its target position (eg when the window is open).
  • the monitoring unit has a further change-over switch which, in a first switch position, has the resonant circuit provided for inductive coupling to the resonant circuit of the distributor with a signal detector circuit for a signal emitted by the distributor and a second switch position with a signal generating circuit for emitting an acknowledgment signal connects.
  • the monitoring unit is then switched over in synchronization with the clock-controlled changeover switch of the distributor between a receiving and a sending state.
  • the monitoring unit has a signal detector circuit which detects whether a voltage is induced in the resonant circuit of the monitoring unit by the resonant circuit of the distributor.
  • the signal detector circuit remains connected to the resonant circuit of the monitoring unit and the induced voltage of this resonant circuit is fed via a diode to a buffer capacitance to build up an operating voltage. If the signal detector circuit recognizes that after switching over the clock-controlled toggle switch of the distributor, no more voltage is induced in the resonant circuit of the monitoring unit, it outputs a signal to the signal generating circuit for generating an acknowledgment signal and at the same time switches the signal generating circuit to the voice coil of the monitoring unit at. A in the signal generating circuit monostable multivibrator generates a control signal with a fixed time t3 for a downstream oscillator.
  • the oscillator leads for the duration t3 of the control signal to the resonant circuit an AC voltage signal, which is interpreted by the signal evaluation circuit of the distributor as an acknowledgment signal.
  • the signal detector circuit only triggers the oscillator of the signal generating circuit when the alarm transmitter is in the normal state at the same time.
  • the oscillator of the signal generation circuit is not triggered, and thus the acknowledgment signal is not output.
  • the signal evaluation circuit of the distributor then assumes an alarm state of the alarm transmitter.
  • the acknowledgment signal is also not output when the oscillating circuit of the tailer and the oscillating circuit of the monitoring unit are moved far apart, which is the case when the window is opened or when the transmission unit is violently removed from the window.
  • an alarm state is also assumed by the signal evaluation circuit of the vertailers.
  • An advantage of this development of the invention is the fact that a signal with a defined frequency is emitted as the acknowledgment signal, which signal can be clearly interpreted as an acknowledgment signal in the signal evaluation circuit of the distributor. This detection of the signaling state of the alarm transmitter works much more precisely than a measurement of the coil current of the distributor which is dependent on many parameters.
  • the signal generation circuit has an oscillator arrangement which emits an acknowledgment signal, the frequency of which is dependent on the output signal of the alarm transmitter. If the status of the alarm transmitter changes, the oscillator of the signal generating circuit is therefore not switched on, but an acknowledgment signal with a frequency that differs from the frequency of the signal in the normal state of the alarm transmitter is fed to the voice coil of the monitoring unit and thus to the distributor.
  • This can be realized, for example, by arranging two oscillators connected in parallel, which are switched on by the alarm transmitter and the monostable multivibrator via upstream AND gates. One oscillator is switched on when the alarm transmitter is in the normal state and the other oscillator is switched on when the alarm transmitter is in the alarm state.
  • FIG. 1 illustrates the inside of a window sash 6 which is built into a wall 2 and which is pivotably articulated via hinges 4. This comprises a glass pane 8 and a window frame 10.
  • An alarm arrangement e.g. A glass break detector, which is provided with the reference symbol 12, serves to record and evaluate the signaling states of an alarm transmitter and / or the opening state of a window. It consists of two separate parts, namely a monitoring unit 14 on the window sash 6 and a wall-side distributor 16, which is connected to a central alarm system (not shown) via supply lines 18 and alarm lines 20. A large number of such alarming arrangements can be connected to the signaling center.
  • the monitoring unit 14 comprises a passive glass break sensor 22 which is glued directly onto the glass pane 8.
  • An electronic circuit arrangement 24 is connected downstream of the glass break sensor 22 and processes the output signals of the glass break sensor 22 for further processing. It is connected to a coupling electronics 26, via which a wireless exchange of energy and information to the distributor 16 takes place.
  • the monitoring unit 14 is arranged on the edge of the glass pane 8 or the window sash 6.
  • the distributor 16 is located directly opposite the coupling electronics 26, so that the wireless transmission path is kept as short as possible.
  • this transmission path is interrupted, for example by the fact that the monitoring unit 14 has been improperly removed, that it has detached itself from the glass pane 8 or that the window sash 6 is open, this condition is determined by the signaling center via the signaling lines 20. If the alarm center is armed, the alarm center triggers an alarm. In the unset state, arming is hereby excluded since the glass break detector 12 cannot work properly.
  • the function of the glass break detector 12 is described in detail below with reference to the block diagram in FIG. 2.
  • the distributor 16 contains an oscillating circuit 28, which consists of a parallel connection of a first coil 30 and a first capacitance 32.
  • One connection of the resonant circuit 28 is at ground (0V), while the other connection is connected to a clock-controlled changeover switch 34, which is switched over by a clock generator 36 between a first switch position and a second switch position.
  • the resonant circuit 28 of the distributor 16 is connected to a first oscillator 38, which outputs a higher-frequency output signal f 1 than the clock frequency of the clock generator 36, which is in the region of the resonant frequency of the resonant circuit 28.
  • the distributor 16 In this first position of the clock-controlled changeover switch 34, the distributor 16 operates as a transmitter and the monitoring unit 14 coupled via the coupling electronics 26 acts as a receiver in the manner described below. In the second position (dash-dotted line) of the clock-controlled toggle switch 34, the distributor 16 functions as a receiver and the monitoring unit 14 in the manner described in more detail below as a transmitter, the signal evaluation circuit 40 receiving an acknowledgment signal from the monitoring unit 14 received from the resonant circuit 28 of the distributor 16 for derivation evaluates an alarm or non-alarm signal.
  • the signal evaluation circuit 40 has at its input a voltage detector circuit 42 which rectifies the signals induced in the voice coil 28 of the distributor 16.
  • the output of the voltage detector circuit 42 is connected to a switching stage 44 designed as a bistable multivibrator.
  • the output of the bistable multivibrator 44 leads via a first diode 46 and a first resistor 48 to an integrating RC element, which consists of a second resistor 50 and a second capacitor 52.
  • the binary signal coming from the bistable multivibrator 44 is thus integrated by the RC element 50, 52 into an analog signal which is routed to a second switching stage 54 with Schmitt trigger behavior.
  • the output of the Schmitt trigger 54 switches from logic high to logic low and thus switches on a light-emitting diode 56 and a relay 58 which closes a line circuit of the alarm lines 20 connected to the alarm center.
  • the alarm center detects an alarm state of the glass break sensor 22 and the measures provided for this can be initiated.
  • the monitoring unit 14 is coupled with its own resonant circuit 60 to the resonant circuit 28 of the distributor 16 when the window sash 6, on which the monitoring unit 14 is arranged, is closed.
  • the resonant circuit 60 of the monitoring unit 14 consists of a third capacitance 62 and a second coil 64.
  • This resonant circuit 60 is connected by a further changeover switch 66 in a first switch position to a signal detector circuit 68 and in a second switch position to a signal generating circuit 70.
  • the clock-controlled changeover switch 34 of the distributor 16 is in its first switch position and the first oscillator 38 is connected to the resonant circuit 28 of the distributor 16, the further changeover switch 66 of the monitoring unit 14 is also in the first switch position shown.
  • the voltage signal induced by the resonant circuit 28 of the distributor 16 in the second coil 64 of the monitoring unit 14 is applied to a second voltage detector 72 located at the input of the signal detector circuit 68.
  • the voltage signal is converted there into a DC voltage signal and fed to a third switching stage 74, which is designed as a comparator and compares the DC voltage signal with a reference voltage.
  • the voltage signal induced by the second coil 64 is also applied via a second diode 76 to a buffer capacitance 78 which provides the operating voltage for the signal detector circuit 68, the signal generation circuit 70 and the glass break sensor 22 for a limited period of time.
  • No induction of the voltage signal in the second coil 64 for example because the clock generator 36 switches the clock-controlled alternating switch 34 of the distributor 16 from the first switch position to the second switch position, the DC voltage present at the output of the second voltage detector 72 drops. If it falls below a specified value, the comparator 74 switches the further changeover switch 66 and supplies an input of the signal generating circuit 70 with an enable pulse.
  • the release pulse triggers a monostable multivibrator 80 arranged at the input of the signal generating circuit 70 only when the glass break sensor 22 connected to a further input of the monostable multivibrator 80 is in a normal or non-alarm state.
  • a monostable multivibrator 80 arranged at the input of the signal generating circuit 70 only when the glass break sensor 22 connected to a further input of the monostable multivibrator 80 is in a normal or non-alarm state.
  • an oscillator 82 arranged downstream of it is activated for the switching period t 3 of the monostable multivibrator 80.
  • the output signal of the downstream oscillator 82 is then fed to the resonant circuit 60 of the monitoring unit 14 as an acknowledgment signal.
  • the voltage signal thereby induced in the resonant circuit 28 of the distributor 16 is then evaluated in the signal evaluation circuit 40 of the distributor 16 in the manner already described.
  • the operating voltage supplied by the buffer capacitance 78 has dropped to such an extent that the comparator 74 falls back into its starting position and switches the further changeover switch 66 into the first switch position. It is also possible to switch the further changeover switch 66 into the second switch position by means of a monostable multivibrator, as a result of which the switch back to the first switch position would take place automatically after a predetermined time (not shown).
  • FIG. 3 schematically shows the structure of a signal generation circuit 84 which, like the signal generation circuit 70 from FIG. 2, is provided for generating an acknowledgment signal as a function of the output signals of the signal detector circuit 68 and the alarm generator 22.
  • the circuit shown in FIG. 2 Identical circuit parts are provided with identical reference symbols.
  • the signal detector circuit 68 detects a change in the activity of the distributor 16 from the transmit to the receive function, the signal detector circuit 68 emits a pulse which causes the monostable multivibrator 80 to emit an output pulse with a defined time t 3.
  • This output pulse is applied to the first inputs of two downstream AND gates 86, 88 connected in parallel.
  • the output signal of the alarm transmitter 22 is applied to the second input of the first AND gate 86 and the inverting second input of the second AND gate 88.
  • the first AND gate 86 is connected to a first oscillator 90 and the second AND gate 88 is connected to a second oscillator 92.
  • the oscillation frequency of the two oscillators 90, 92 is different from one another.
  • the outputs of the two oscillators 90, 92 are brought together and can be connected to the resonant circuit 60 of the monitoring unit 14 via the further changeover switch 66.
  • either the first oscillator 90 or the second oscillator 92 is triggered for the trigger time t 3 of the monostable multivibrator for the time t 3 to emit an acknowledgment signal.
  • the distributor 16 can then recognize by means of a signal evaluation circuit which detects the frequency of the acknowledgment signal whether the detector is in the triggered or non-triggered alarm state.
  • the signal evaluation circuit 40 of the distributor 16 is able to distinguish whether a window is open (no acknowledgment signal), whether the window is closed and the alarm device reports a normal state (delivery of a Acknowledgment signal with a first frequency by the first oscillator 90) or whether the window is closed and the alarm device reports an alarm state (delivery of an acknowledgment signal with a second frequency by the second oscillator 92).
  • oscillator arrangement with many to measure the analog measured value, for example of a vibration detector perform oscillators of different oscillation frequencies connected in parallel. These oscillators would then have to be individually controlled via an upstream A / D converter.
  • An oscillator adjustable in frequency by an analog control could also be used, which would then be triggered directly by a monostable multivibrator and the alarm device, the oscillation frequency being set by the analog output signal of the alarm device.
  • the different frequencies could be evaluated directly in the signal evaluation circuit of the distributor to derive an alarm or non-alarm state. However, it is also conceivable to transmit the signals of different frequencies present at the signal evaluation circuit to the signaling lines to the signaling center for evaluation there.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Electromechanical Clocks (AREA)

Claims (10)

  1. Transmetteur comportant d'une part une unité de surveillance (14) montée sur une vitre mobile (8) à surveiller ou sur une porte et équipée d'un transmetteur d'alarme , d'autre part un distributeur fixe (16), relié à une centrale d'alarme et couplé par induction à l'unité de surveillance (14), dans une position de consigne de la vitre (8) ou de la porte, caractérisé en ce que le distributeur (16) comprend un circuit oscillant (28) qui, sous la commande d'un commutateur alternatif (34) fonctionnant en cadence, est relié dans une première position du commutateur à un premier oscillateur (38), de manière à faire fonctionner le circuit (28) en émetteur, et dans une seconde position du commutateur à un circuit d'exploitation de signal (40) recevant les signaux émis par l'unité de surveillance (14), de manière à faire fonctionner le circuit (28) en recepteur, tandis que l'unité de surveillance (14) est équipée d'un autre circuit oscillant (60) couplé par induction au circuit oscillant (28) du côté du distributeur, le circuit (60) étant ainsi connecté au déclencheur d'alarme, de sorte que, dans un état non perturbé, il vibre même après coupure du circuit oscillant du côté du distributeur.
  2. Transmetteur selon la revendication 1, caractérisé en ce que la commande cadencée est produite par un générateur de cadence (36), dont la période de cadence comporte une première position plus longue que la seconde.
  3. Transmetteur selon la revendication 1 ou 2, caractérisé en ce que la fréquence du premier oscillateur (38) se situe dans la plage de la fréquence de résonance du circuit oscillant (28) du distributeur (16).
  4. Transmetteur selon l'une des revendications précédentes, caractérisé en ce que le circuit d'exploitation du signal (40) comprend un détecteur de tension (42) ayant, pour rôle de délivrer un signal de tension continue corrélé au signal d'entrée, ainsi qu'un circuit comparateur (54) monté en aval du détecteur de tension (42) et que compare le signal de tension continue à au moins une tension de référence, pour délivrer au moins un état d'information.
  5. Transmetteur selon la revendication 4, caractérisé en ce que le détecteur de tension (42) est monté dans le circuit d'exploitation du signal (40), côté entrée, et a la forme d'un redresseur, le redresseur (42) étant suivi d'un premier étage de commutation (44) fonctionnant en étage à bascule bistable dont la sortie est reliée à un circuit RC (50, 52) qui délivre après intégration un signal analogique en tension continue à un second étage de commutation, fonctionnant en déclencheur de Schmitt - Trigger, dont le signal de sortie est envoyé à un indicateur d'alarme (56) et/ou à une centrale d'information.
  6. Transmetteur selon l'une des revendications précédentes, caractérisé en ce que l'unité de surveillance (14) comporte un second commutateur inverseur (66) qui relie le circuit oscillant (60) prévu pour assurer le couplage inductif du circuit oscillant (28) du distributeur (16), dans une première position de commutation à un circuit de détection de signal (68) opérant sur la sortie du distributeur, et dans une seconde position de commutation à un circuit générateur de signal (70) délivrant un signal de réception.
  7. Transmetteur selon la revendication 6, caractérisé en ce que dans la première position de commutation du second commutateur inverseur (66) le signal reçu par le circuit oscillant (60) de l'unité de surveillance (14) est adressé par l'intermédiaire d'une seconde diode (76) à une capacité tampon (78), afin de fournir une tension de service à l'unité de surveillance (14).
  8. Transmetteur selon la revendication 6 ou 7, caractérisé en ce que le circuit de détection de signal (66) comporte à son entrée, un second détecteur de tension (72) fonctionnant en redresseur suivi d'un troisième étage de commutation (74) fonctionnant en comparateur, dont le signal de sortie actionne le second commutateur inverseur (66), et amène le circuit générateur de signal (70), dans la seconde position de commutation, en connexion logique ET avec le signal de sortie de l'émetteur d'alarme (22), afin de délivrer un signal de réception.
  9. Transmetteur selon l'une des revendications 6 à 8, caractérisé en ce que le circuit générateur de signal (70) comporte un étage à bascule (80) monostable qui enclenche un oscillateur (82) situé en aval pour délivrer un signal de réception.
  10. Transmetteur selon l'une des revendications 6 à 9, caractérisé en ce que le circuit générateur de signal (84) comporte un dispositif oscillant (90, 92) délivrant un signal de réception dont la fréquence est fonction du signal de sortie du déclencheur d'alarme (22).
EP88119028A 1987-11-16 1988-11-15 Transmetteur d'alarme Expired - Lifetime EP0316872B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT8888119028T ATE104782T1 (de) 1987-11-16 1988-11-15 Alarmgebeanordnung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873738894 DE3738894A1 (de) 1987-11-16 1987-11-16 Glasbruchmelder
DE3738894 1987-11-16

Publications (3)

Publication Number Publication Date
EP0316872A2 EP0316872A2 (fr) 1989-05-24
EP0316872A3 EP0316872A3 (en) 1990-06-20
EP0316872B1 true EP0316872B1 (fr) 1994-04-20

Family

ID=6340604

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88119028A Expired - Lifetime EP0316872B1 (fr) 1987-11-16 1988-11-15 Transmetteur d'alarme

Country Status (3)

Country Link
EP (1) EP0316872B1 (fr)
AT (1) ATE104782T1 (fr)
DE (2) DE3738894A1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3915812A1 (de) * 1989-05-13 1990-11-15 Oscar Von Wedekind Vorrichtung zum verschliessen eines raumes, wie fenster oder dergleichen
EP0451445A3 (en) * 1990-04-12 1993-02-24 Richard Hirschmann Gmbh & Co. Contactless inductive transmission method of electrical energy and/or signals and contactless inductive transmission device
DE4112064A1 (de) * 1990-04-12 1991-10-17 Hirschmann Richard Gmbh Co Alarmgeberanordnung
DE4023412A1 (de) * 1990-07-23 1992-02-13 Hirschmann Richard Gmbh Co Verfahren zum kontaktlosen, induktiven uebertragen von elektrischen energien und/oder signalen sowie kontaktloser, induktiver uebertrager
DE4105632C2 (de) * 1990-11-30 1993-12-02 Hirschmann Richard Gmbh Co Einbruchmelderanordnung
DE4204494C2 (de) * 1992-02-14 1994-06-16 Hirschmann Richard Gmbh Co Einbruchmeldeanordnung
DE4242549C1 (de) * 1992-12-16 1994-03-17 Hirschmann Richard Gmbh Co Einbruchmelderanordnung
DE102007003749A1 (de) * 2007-01-19 2008-07-31 Schollglas Holding- und Geschäftsführungsgesellschaft mbH Glasbruchmelder
DE102010061471A1 (de) * 2010-12-22 2012-06-28 Dr. Hahn Gmbh & Co. Kg Verfahren und Vorrichtung zur kontaktlosen Übertragung von elektrischer Energie zwischen einer Wand und einem an dieser Wand befestigten Flügel
DE102011050342A1 (de) * 2011-05-13 2012-11-15 Dr. Hahn Gmbh & Co. Kg Verfahren und Vorrichtung zur kontaktlosen Übertragung von elektrischer Energie zwischen einer Wand und einem an dieser Wand befestigten Flügel
WO2012045658A1 (fr) * 2010-10-04 2012-04-12 Dr. Hahn Gmbh & Co. Kg Procédé et dispositif de transmission sans contact d'énergie électrique entre une paroi et un battant fixé à cette paroi
EP2625360A1 (fr) * 2010-10-04 2013-08-14 Dr. Hahn GmbH & Co. KG Procédé et dispositif de transmission sans contact d'énergie électrique et/ou de signaux électriques entre une paroi et un battant fixé contre cette paroi
DE102015221342B4 (de) * 2015-10-30 2017-09-07 Ifm Electronic Gmbh Induktiver Näherungsschalter

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4030089A (en) * 1976-04-02 1977-06-14 Wolfgang Wurfel Alarm system
FR2442452A1 (fr) * 1978-11-27 1980-06-20 Alsthom Cgee Dispositif de reconnaissance a distance d'un mobile porteur d'un dispositif repondeur code
DE2854199A1 (de) * 1978-12-15 1980-06-26 Vdo Schindling Einrichtung zum uebertragen von messwerten
JPS6090437A (ja) * 1983-10-08 1985-05-21 Riide Denki Kk 信号伝達装置
DE8711035U1 (de) * 1987-08-13 1987-09-24 Werner Turck Gmbh & Co Kg, 5884 Halver Berührungslos wirkender Näherungsschalter

Also Published As

Publication number Publication date
DE3738894A1 (de) 1989-06-01
EP0316872A3 (en) 1990-06-20
DE3889199D1 (de) 1994-05-26
DE3738894C2 (fr) 1990-03-29
ATE104782T1 (de) 1994-05-15
EP0316872A2 (fr) 1989-05-24

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