JPH05274561A - Burglar alarm device - Google Patents

Abstract

PURPOSE:To provide a burglar alarm device capable of driving its alarm when the device itself attached to a displayed commodity is detached and allowing alarm releasing operation only by prescribed reset operation without stopping the alarm operation even if the device body is attached again. CONSTITUTION:An input signal holding circuit 2 is constituted of a thyristor SCR, the SCR is set up to an ON state by using current flowing at the time of receiving a detection signal from a detection part 3 consisting of a wire or the like as a gate circuit, an alarm 5 is driven simultaneously with the setting of the ON state, and at the time of receiving a signal from a release sensor circuit 7 consisting of a normally-opened reed switch RS or the like which is generated by driving a release sensor exciting circuit 6 by magnetism, infrared rays, ultrasonic waves, or the like, the SCR is turned off, and an alarm driving circuit 4 is reset and restored to the original state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crime prevention alarm device which is particularly suitable for theft prevention in shoplifting, for example, when the device attached to an exhibited product is detached, an alarm is activated, and even if it is reattached, an alarm is activated. The present invention relates to a crime prevention alarm device in which the alarm can be released only by a predetermined reset operation without stopping.

[0002]

2. Description of the Related Art A conventional shoplifting prevention device is disclosed in
A wire portion forming a part of the device circuit is connected to a product at a predetermined place, an alarm is activated when the wire is cut without permission, and in order to stop the alarm operation, a power source is disconnected from the circuit. It is physically removed, and after connecting the cut wire in the removed state, the power source is fitted and the circuit is closed.

[0003]

However, according to the above configuration, if the disconnected wire is suddenly reconnected without disconnecting the power source, the alarm operation is stopped, and a short circuit is preliminarily shorted and the outside of the alarm operation is terminated. Since the alarm will not operate if the power is cut off, the shoplifting prevention effect cannot always be achieved, and because the power supply is physically attached and detached, the power supply mounting part is easily physically damaged. There was a flaw.

The present invention solves such a problem, and once the alarm is activated, the release sensor circuit is activated by bringing the predetermined means into contact or non-contact even if the detection part such as the wire is returned to its original shape. Unless it is stopped, the alarm will continue to operate reliably and stably, and when a predetermined means is applied to the release sensor, the device will automatically reset and return to the initial state. It is intended to provide a crime prevention alarm device that enables the above.

[0005]

In order to solve the above-mentioned problems, the present invention is such that an input signal holding circuit is normally set to an off state, and the input signal holding circuit is held by a signal from a detection section for detecting theft or the like. As soon as the circuit is turned on, the alarm activation circuit closes and the alarm operates, and even if the detector is restored, the input signal holding circuit maintains the on state and the alarm continues to operate, and the release sensor circuit receives the input signal. The crime prevention alarm device is configured so that the release sensor circuit can be closed and the input signal holding circuit can be returned to the off state only when the external release sensor excitation circuit is operated by being connected to the holding circuit. It is what

Further, in a more specific structure of the crime prevention alarm device, the input signal holding circuit is composed of a thyristor, and a current flowing in response to a detection signal of a detection section is used as a gate circuit to set the thyristor to an ON state. It is preferable that the alarm device is configured to be activated at the same time, and that the thyristor is turned off by receiving a signal from the release sensor circuit, and the alarm activation circuit is reset to return to the original shape. ..

The release sensor excitation circuit is composed of magnetic, infrared light,
It is desirable to configure the release sensor circuit to be excited by non-physical means such as ultrasonic waves.

Further, the crime prevention alarm device of the present invention comprises an auxiliary power source in parallel with the main power source in a cut-off state via a thyristor, and at the same time as non-conduction from the main power source due to battery exhaustion or power interruption, the alarm activation circuit It is also characterized in that a gate signal is generated in the gate circuit of the thyristor, the thyristor is set to the ON state in response to the gate signal, and at the same time, the thyristor that cuts off the auxiliary power is set to the ON state. Is to

Furthermore, in the case where the release sensor excitation circuit is a magnet, a hole is formed in the main body of the apparatus for inserting the acting portion of the magnet, and the release sensor circuit or the entire apparatus main body except the inside of the hole is formed. It is preferable to employ a structure in which magnetic shielding is performed.

[0010]

[Operation] In response to the signal from the detection unit caused by theft,
When the alarm activation circuit operates and the input signal holding circuit, for example, the thyristor is set to the ON state, the alarm is activated and the ON state is maintained and the alarm is activated even if the detection unit is restored and the signal is interrupted. Keep doing. When the release sensor circuit is actuated by the release sensor excitation circuit, the input signal holding circuit is turned off by this signal, and the alarm actuation circuit is reset and returned to its original shape.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of this device, and FIG. 2 is a circuit diagram. In this device, the input signal holding circuit 2 connected to the power source 1 is always kept in the off state, and the abnormality detection signal from the detection unit 3 for notifying an abnormality such as theft of goods is sent to the input signal holding circuit 2 once. In this case, the circuit 2 is automatically switched to the ON state, the alarm activation circuit 4 is closed, and the alarm 5
The release signal is sent to the signal holding release circuit 8 only when the release sensor circuit 7 is forcibly closed using the predetermined release sensor excitation circuit 6, and the input signal holding circuit 2
Is reset to a reset state and the operation of the alarm device 5 is stopped, and the release sensor excitation circuit 6 is configured separately from the device body A.

The power source 1 can be an arbitrary power source, but by using a battery, the portability and versatility of the device can be further enhanced. The input signal holding circuit 2 is a thyristor SCR1.
The alarm actuation circuit 4 is a thyristor S in which the anode side of the alarm device 5 is connected in series to the power source 1.
The thyristor SCR1 is formed by connecting CR1 and a detection unit 3 in which a resistor R3 is connected in series in parallel, and using the resistor R2 and the capacitor C2 connected in parallel with the detection unit 3 as a gate circuit.
It is connected to the cathode side gate of the
When the current is flowing to the detection unit 3 at the same time that the circuit is kept off, and the detection unit 3 is cut off 4, the gate current passing through the gate circuit triggers the thyristor SCR1 to turn on and the alarm 5 To activate
Even if the circuit of the detection unit 3 is connected, the thyristor SCR
1 is stored in the ON state, and is configured to continue operating the alarm device 5.

The detection unit 3 may be set so that the circuit is always cut off and a trigger is applied when the circuit is connected. Further, the alarm device 5 may employ a warning device, such as a buzzer or a light emitting diode LED, depending on the application, and may be configured to simultaneously activate two or more warning devices as shown by a dotted line in FIG. Of course it is possible.

The release sensor circuit 7 is a normally open reed switch R.
The signal holding release circuit 8 uses S, and the thyristor SCR1 is connected to the normally open reed switch RS
And a resistor R1 and a capacitor C1 connected in series are connected in parallel, and the release sensor excitation circuit 6 having an external configuration forcibly closes the release sensor circuit 7, and at the same time, the thyristor SCR1 is restored. The alarm operation circuit 4 is reset, the operation of the alarm device 5 is stopped, and even when the normally open reed switch RS is opened, the thyristor SCR1 is configured to maintain the reset state.
By connecting the detection unit 3, the initial circuit state is restored.

The release sensor excitation circuit 6 may be a magnet having a predetermined shape corresponding to the normally open reed switch RS. In this case, the security alarm device constituted by the above circuit is magnetically shielded in its entirety or at least the outer circumference of the normally open reed switch RS excluding at least the non-contact contact part, and only when a magnet of a predetermined shape is acted from a predetermined direction. Can be configured to operate, and if configured in this manner, it is possible to prevent the alarm device 5 from being deactivated in an unprotected or easy manner. Therefore, it is more preferable than a configuration without a magnetic shield. It becomes a security alarm device.

For example, as shown in FIG. 3, the release sensor excitation circuit 6 is an elongated rod-shaped magnet, and a hole 9 into which the rod-shaped magnet can be deeply inserted is formed only at one location on the outer body of the apparatus main body A. A normally open reed switch RS is provided at the end of the hole 9 and the normally open reed switch R except the rear end of the hole 9 is provided.
If the outer peripheral portion of S is constituted by the magnetic shield 10, the normally open reed switch RS does not operate even if a magnet is appropriately brought into contact with the outside of the apparatus main body A, and the rod-shaped magnet having a predetermined shape is deeply inserted into the hole 9. Only then can the normally open reed switch RS be closed, and it is possible to provide a crime prevention alarm device in which the operation of the alarm device 5 is difficult to stop for an outsider.

In the case where the main body A of the apparatus is used only within a predetermined range, it is possible to set the external power source to the power source 1 without worrying about battery life. In this case, the alarm device is activated even when the power source is cut off. It is desirable to have a built-in rechargeable battery so that the 5 can operate.

Further, when the power source 1 is a battery, it is more practically effective to notify that the battery is dead so that an unexpected inoperative state of the apparatus does not occur. Generally, the battery purchase date or the battery life date may be displayed on the outside of the main body of the device, but if the self-management method of the device itself is adopted, automatic check is possible. preferable.

As an example of the self-management system, a dead battery warning circuit as shown by a dotted line in FIG. 2 can be provided in parallel. That is, the auxiliary power source 11 such as a charger or a battery is used as the power source 1
The thyristor SC is arranged in parallel with the auxiliary power supply 11 and the alarm device 5 and the cathode side is connected to the alarm device 5.
R2 is connected in series and a capacitor C2 of the gate circuit of the thyristor SCR1 is connected as a gate circuit for gated to the cathode side of the thyristor SCR2.

The auxiliary power supply 11 turns on the thyristor SCR1 by the gate signal from the capacitor C2 when the battery of the power supply 1 is exhausted, and at the same time, the thyristor SCR is turned on.
CR2 is turned on, the circuit of the alarm device 5 is maintained in the on state, the alarm device 5 is activated, and the release sensor excitation circuit 6
Thus, by closing the normally open reed switch RS, the thyristors SCR1 and SCR1 can be reset to the off state. The battery of the power supply 1 may be replaced at the same time as the reset.

The detection unit 3 is a wire of an appropriate length that can be attached to a product, and if the product and the display place are combined, the wire must be cut in order to take the product out of a predetermined range. At the same time as disconnection, the alarm device 5 is activated to notify theft. Once the alarm device 5 is activated, the release sensor circuit 7 must be closed using a predetermined release means. Further, the detection unit 3 may be a pressure-sensitive switch or the like, and it suffices that the alarm actuation circuit 4 is activated by pushing or pulling the switch due to the fluctuation of the load of the product.

Further, as shown by the dotted line in FIG. 2, the detecting section 3 is a three-wire set of one wire 12 in an insulated state on the above-mentioned two wires, and the wire 12 is connected to the gate terminal of the thyristor SCR1. It can be configured to be connected. According to this, for example, even if the wire of the detection unit 3 is burnt out by a lighter or the like to make a short circuit, one of the two main wires and the single wire 12 is short-circuited to turn on the thyristor SCR1. As a result, the alarm device 5 is activated, and the security of theft prevention is further enhanced.

If a product card mounting portion is formed on the outer body of the device main body A, even if the security alarm device is separated from the product, it is possible to know what product is combined, so that it is possible to prevent theft. It can be more effective.

The release sensor circuit 7 can be configured to operate by receiving mechanical external pressure or contact, but if it is a non-contact configuration, the release sensor excitation circuit 6 faces the release sensor circuit 7. Since the operation of the alarm device 5 can be stopped and the alarm operation circuit 4 can be returned to the initial state by only one-touch operation, the stability of the device,
This is extremely advantageous in terms of physical damage prevention, ease of operation, and the like. The normally open reed switch RS as a non-contact configuration
Instead, a photoelectric conversion circuit that receives an optical sensor such as far infrared light, an electric field resonance (tuning) circuit using a coil, an ultrasonic sensor circuit, or the like can be used.

With the above-described structure, the release sensor circuit 7 is not operated by operating the power supply, instead of opening and closing the circuit by attaching and detaching the power supply. It is possible to provide a device that closes the input signal holding circuit 2 and resets the input signal holding circuit 2 to the reset state to stop the operation of the alarm device 5.

[0026]

As described above, according to the present invention, the alarm is automatically activated by receiving the detection signal of the detection unit due to the disconnection of the wire or the switch or the opening / closing of the circuit, and the detection unit is returned to the original state. Even if it is returned, the alarm operation cannot be stopped unless the release sensor circuit is operated by bringing the release sensor excitation circuit close to the release sensor excitation circuit in a contact or non-contact state. It is possible to provide a crime prevention alarm device capable of one-touch operation, in which the alarm actuation circuit is automatically reset when the means is acted on the release sensor to return to the initial state.

If the release sensor excitation circuit is configured to excite the release sensor circuit by using a non-physical means such as magnetism, infrared light, and ultrasonic waves, that is, a non-contact type, the alarm activation circuit can be easily reset. Therefore, the function as a crime prevention alarm device can be further enhanced.

If the auxiliary power source is provided and the main power source is configured to immediately alarm an unexpected situation such as battery exhaustion or power interruption, the security alarm device can continue to operate stably and reliably. The use value of the security alarm device can be further increased.

When the release sensor excitation circuit is a magnet, if a predetermined magnetic shield is formed on the release sensor circuit of the main body of the apparatus or the entire main body of the apparatus, the apparatus can be easily used with a magnet other than the magnet of the predetermined shape. Since it becomes impossible to interrupt the alarm activation circuit of, it is possible to further enhance the stability of the alarm activation.

[Brief description of drawings]

FIG. 1 is a block diagram of an example crime prevention alarm device according to the present invention.

FIG. 2 is a circuit diagram of an example crime prevention alarm device according to the present invention.

FIG. 3 is a schematic external view showing an example of the mechanism of the release sensor of FIG.

[Explanation of symbols]

 A device main body 1 power supply 2 input signal holding circuit 3 detection unit 4 alarm activation circuit 5 alarm 6 release sensor excitation circuit 7 release sensor circuit 8 signal holding release circuit 9 hole 10 magnetic shield 11 auxiliary power supply 12 wire SCR1, SCR2 thyristor RS normal Open reed switch

Claims (5)

[Claims] 1. An input signal holding circuit is normally set to an off state, and at the same time that the input signal holding circuit is turned on by a signal from a detection unit for detecting theft or the like, an alarm actuation circuit is closed and an alarm device is activated. Even if it operates and the detection unit is restored, the input signal holding circuit remains on and the alarm continues to operate, the release sensor circuit was connected to the input signal holding circuit, and the external release sensor excitation circuit was activated. A security alarm device having a configuration in which the release sensor circuit can be closed to return the input signal holding circuit to the off state only in the case. 2. The input signal holding circuit is constituted by a thyristor, and a current flowing in response to a detection signal of a detection section is set as a gate circuit to set the thyristor in an ON state, and at the same time an alarm device is activated and released. The thyristor turns off in response to the signal from the sensor circuit,
The security alarm device according to claim 1, wherein the alarm activation circuit is configured to be reset to return to its original shape. 3. The release sensor excitation circuit comprises magnetic, infrared light,
The security alarm device according to claim 1 or 2, which is configured to excite the release sensor circuit by non-physical means such as ultrasonic waves. 4. An auxiliary power supply is provided in parallel with the main power supply in a cut-off state through a thyristor, and at the same time as non-conduction from the main power supply due to battery exhaustion or power interruption, a gate signal is sent to the gate circuit of the thyristor of the alarm activation circuit. And a thyristor which is turned off by receiving the gate signal and sets the thyristor in an on state at the same time. The security alarm device according to any one of 1. 5. When the release sensor excitation circuit is a magnet, a hole is formed in the main body of the apparatus for inserting the acting portion of the magnet, and the release sensor circuit except the inside of the hole or the entire main body of the apparatus is magnetically shielded. The crime prevention alarm device according to any one of claims 1 to 4, comprising a configuration.