JP3139596U - Anti-theft display type magnet sensor - Google Patents

Abstract

An anti-theft display type magnet sensor that simplifies circuit connection, reduces the occurrence of failure, and can know in advance whether the operation of the magnet sensor is normal or not is provided.
An anti-theft display type magnetic sensor is disposed in a safety system including a shared circuit, a normally closed circuit, and a normally open circuit, and includes a switch, a magnet, and a light emitting element. The switch 1 is connected to a shared circuit 121 and has a reed switch metal lead 11 that is selectively connected to a normally closed circuit 122 or a normally open circuit 123. The magnet 2 is disposed outside the switch 1 at a location corresponding to the switch 1. When the magnet 2 approaches the switch 1, the metal lead 11 of the reed switch is separated from the normally closed circuit 122 by the magnetic attractive force of the magnet 2. When the normally closed circuit 123 is contacted, the normally closed circuit 122 is disconnected, and the magnet 2 is separated from the switch 1, the metal lead 11 of the reed switch contacts the normally closed circuit 122, and the normally closed circuit 122 is It becomes conductive.
[Selection] Figure 4

Description

  The present invention relates to an anti-theft magnet sensor, and more particularly to an anti-theft display type magnet sensor in which light emitting elements are connected in series to a normally closed circuit of a safety system.

  The anti-theft magnet sensor generally includes a magnet sensor body and a magnet member respectively attached to a fixture (for example, a door frame) and a movable element (for example, a door) of an object for preventing theft. When the door is closed and the magnet sensor body and magnet member are within the sensing range, the contact point of the reed switch of the magnet sensor body is short-circuited, and when the return current is normal, it is detected that the usage state is normal. The When the door is opened, the magnet member moves with the door and leaves the magnet sensor main body. And if this magnet sensor body moves away from the range of the magnetic force lines of the magnet member and the contact point of this reed switch is opened without receiving the magnetic attractive force, the return current disappears or decays, and the usage condition is abnormal. It is determined that there is an intruder (that is, there may be an intruder), and an alarm alarm is issued through the controller, or other methods are used to warn.

  However, the conventional magnet sensor may not be able to detect, and the main causes are as follows.

(1) The magnet sensor is always in use, and the lead contact is magnetized when the magnet member is contacted for a long time. For this reason, even if the door is opened, the lead contact is maintained in a conductive state, and may not be able to be opened in a timely manner. Therefore, it was not possible to detect in a timely manner whether or not the door was already opened.

(2) The reed switch of the magnet sensor body is enclosed in a glass tube whose inside is in a vacuum state. Therefore, when the glass tube bursts, air enters and the lead contact is oxidized, and the current value may be attenuated. For these reasons, the magnet sensor may have an inaccurate detection operation or cannot be used normally.

  In order to prevent the situation as described above from occurring, some conventional magnet sensors have been improved so that it can be detected in advance whether or not the magnet sensor normally operates.

  Please refer to FIG. 1 and FIG. FIG. 1 is a schematic view showing a conventional magnet sensor (for example, Patent Document 1). FIG. 2 is a circuit diagram of FIG. As shown in FIGS. 1 and 2, the reed switch 106 in the magnet sensor main body 100 is connected in series between the light emitting diode 108 and the resistor 109 on the contact point of the external signal power supply line 107. . An appropriate resistance value is set for the resistor 109 according to each controller. When the magnet 101 is separated from the magnet sensor main body 100, the contact of the reed switch 106 is opened, a current passes through the circuit of the light emitting diode 108, and the light emitting diode is turned on. As described above, whether the operation of the magnet sensor is normal can be determined based on whether or not the light emitting diode 108 is lit. Further, when the light emitting diode 108 is not lit, the contact of the reed switch 106 is maintained in a conductive state, and it is possible to know an abnormality in operation of the magnet sensor. As described above, whether or not the magnet sensor is operating normally can be determined based on whether or not the light emitting diode is lit, and a failure can be detected and repaired at an early stage.

  The conventional anti-theft magnet sensor is connected in series between a light emitting diode and a resistor on a contact point of a signal power supply line externally attached to a reed switch inside the magnet sensor, so that the resistance of the resistor 109 according to each controller. By properly setting the value and associating whether or not the signal current of the lead contact passing through is within the set value and whether or not to return to the controller with the light emission of the light emitting diode 108, the magnet sensor operates normally. Determine whether or not. However, in the case of such a circuit structure, the number of necessary parts increases, and it is necessary to set a set value for the resistor 109. Further, when the resistor 109 fails, it can no longer be detected.

  Further, when a plurality of conventional anti-theft magnet sensors are connected and used, the magnet sensors cannot be connected in parallel and used only in series. Furthermore, when used in series, if one of the magnet sensors fails and is disconnected, the normal operation of the remaining magnet sensors may be affected.

Taiwan Patent No. 322991

  The purpose of the present invention is to connect a light emitting element in series to a normally closed circuit of a safety system, simplify the circuit connection, reduce the occurrence of failure, and know in advance whether the operation of the magnet sensor is normal or not. An object of the present invention is to provide an antitheft display type magnetic sensor.

(1) In order to achieve the above object, the present invention is an antitheft display type magnetic sensor that is arranged in a safety system including a shared circuit, a normally closed circuit, and a normally open circuit in a circuit, and includes a switch, a magnet, and a light emitting element. The switch has a metal lead of a reed switch connected to the shared circuit and selectively connected to the normally closed circuit or the normally open circuit, and the magnet is located at a location corresponding to the switch. When the magnet approaches the switch, the metal lead of the reed switch is separated from the normally closed circuit by the magnetic attraction force of the magnet and contacts the normally open circuit, and the normally closed circuit When the magnet is disconnected from the switch, the metal lead of the reed switch contacts the normally closed circuit, and the normally closed circuit becomes conductive. Becomes state, the light emitting element, provides an anti-theft display type magnet sensor, characterized in that said being connected to the normally closed circuit in series.

  According to such a configuration, it is possible to determine whether or not the magnet sensor is operating normally based on whether or not the light emitting element emits light, and to find and repair the failure early.

  Since the anti-theft display type magnet sensor of the present invention connects the light emitting elements directly in series to the normally closed circuit of the safety system, there is no need to set a resistance value. Therefore, the entire circuit is simplified, and the occurrence of failure can be reduced. In addition, since it is connected in parallel with the signal power supply, even if one of the magnet sensors fails, normal use of the remaining magnet sensors is not affected.

  Embodiments of the anti-theft display type magnet sensor of the present invention will be described below in detail with reference to the drawings.

  Please refer to FIG. As shown in FIG. 3, the anti-theft display type magnet sensor according to an embodiment of the present invention includes a switch 1 and a magnet 2 arranged to correspond to each other. The switch 1 is mounted on a fixture for a protective object (for example, a door, a window frame, an electric (hand) moving shutter, a window-mounted cooler or a frame of a separate cooler), and necessary circuits are arranged therein. In addition, the circuit wires are extended to the outside. The magnet 2 is mounted on a movable element (for example, a door, a window, or an electric (hand) moving shutter) of an object to be protected, and is disposed so as to correspond to the switch 1.

  Please refer to FIG. As shown in FIG. 4, the anti-theft display type magnet sensor according to an embodiment of the present invention is disposed on the safety system 12. The safety system 12 includes a shared (COM) circuit 121, a normally closed (NC) circuit 122, and a normally open (NO) circuit 123. The switch 1 has a metal lead 11 of a reed switch to which a shared circuit 121 of the safety system 12 is connected. The metal lead 11 of the reed switch can be selectively connected to the normally closed circuit 122 or the normally open circuit 123 of the safety system 12. The normally closed circuit 122 is connected with the light emitting element 13 in series. The light emitting element may be a light emitting diode or a light bulb.

  With the above configuration, when the magnet 2 approaches the switch 1 (that is, when the door is closed), the metal lead 11 of the reed switch is separated from the normally closed circuit 122 by the magnetic attractive force of the magnet, and the normally closed circuit is disconnected (OFF). Thus, the light emitting element 13 does not emit light. On the contrary, when the magnet 2 is separated from the switch 1 (that is, when the door is opened), the metal lead 11 of the reed switch contacts the normally closed circuit 122, the normally closed circuit becomes conductive (ON), and the light emitting element 13 emits light. To do. Whether or not the operation of the magnet sensor is normal can be determined by whether or not the light emitting element 13 emits light. That is, when the light emitting element 13 does not emit light even when the door is opened, this indicates that the metal lead 11 of the reed switch is still in contact with the normally open circuit 123, and thus it is determined that the operation of the magnet sensor is abnormal. it can. In this way, it is possible to know in advance whether repair is necessary.

  FIG. 5 is a circuit diagram showing a state when a plurality of anti-theft display type magnet sensors according to another embodiment of the present invention are connected and used. As shown in FIG. 5, the anti-theft display type magnet sensor of the present embodiment can be connected in parallel and used, so even if one of the magnet sensors breaks down, the remaining magnet sensors Does not affect normal use.

  As described above, since the anti-theft display type magnet sensor of the present invention does not use a resistance element, it is not necessary to set a resistance value, and the circuit structure is simplified, and the magnet sensors are arranged in parallel. Can be used by connecting to. Therefore, the normal use of the remaining magnet sensors is not affected.

  Although preferred embodiments of the present invention have been disclosed above, as those skilled in the art can understand, these are not intended to limit the present invention in any way. Various changes and modifications can be made without departing from the spirit and scope of the present invention. Accordingly, the scope of the utility model registration claim of the present invention should be broadly interpreted including such changes and modifications.

It is a schematic diagram which shows the conventional antitheft magnet sensor. FIG. 2 is a circuit diagram of FIG. 1. It is a perspective view which shows the switch and magnet of an antitheft display type magnet sensor by one Embodiment of this invention. 1 is a circuit diagram illustrating a state where an antitheft display type magnet sensor according to an embodiment of the present invention is connected to only one light emitting element on a normally closed circuit. It is a circuit diagram which shows a state when connecting and using two or more antitheft display type | mold magnet sensors by other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Switch, 11 ... Metal lead of reed switch, 12 ... Safety system, 121 ... Shared circuit, 122 ... Normally closed circuit, 123 ... Normally open circuit, 13 ... Light emitting element, 2 ... Magnet, 100 ... Magnet sensor main body, 101 ... Magnet 106 ... Reed switch 107 ... Signal power line 108 ... Light emitting diode 109 ... Resistance

Claims (3)

An anti-theft display type magnet sensor which is arranged in a safety system including a shared circuit, a normally closed circuit and a normally open circuit in a circuit, and includes a switch, a magnet and a light emitting element,
The switch is connected to the shared circuit and has a metal lead of a reed switch that is selectively connected to the normally closed circuit or the normally open circuit;
The magnet is disposed outside the switch at a location corresponding to the switch, and when the magnet approaches the switch, the metal lead of the reed switch is separated from the normally closed circuit by the magnetic attractive force of the magnet. When the normally closed circuit is contacted, the normally closed circuit is disconnected, and when the magnet is separated from the switch, the metal lead of the reed switch contacts the normally closed circuit, and the normally closed circuit The circuit becomes conductive,
The anti-theft display type magnet sensor, wherein the light emitting element is connected in series with the normally closed circuit.   The antitheft display type magnet sensor according to claim 1, wherein the light emitting element is a light emitting diode.   The antitheft display type magnet sensor according to claim 1, wherein the light emitting element is a light bulb.

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