JPH10228592A - Theft preventing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To emit an alarm even against an illegal action that removes a product by making a cable short-circuited or cutting a wire by detecting the cutoff of 1st and 2nd switching means, the cutting of 1st and 2nd cables and the short circuit of the 1st and 2nd cables and emitting tone. SOLUTION: An object mounting unit 3 is provided with a 1st switch 31 and a 1st resistor 35. An alarm unit 4 is provided with battery 44, a 2nd resistor 45, a 2nd switch 41, a voltage deciding circuit 46, a buzzer driving circuit 47 and a buzzer 11. A wire 5 is provided a 1st cable 53 and a 2nd cable 54. The battery 44, the resistor 45, the cable 53, the resistor 35, the switch 31 and the cable 54 are serially connected in this order and constitute an abnormality detection loop that is a normal state when both of the switches 31 and 41 are closed. The circuit 46 operates the circuit 47 when the voltage level of a connection point P is zero.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-theft device for protecting goods displayed in a store from fraudulent acts such as shoplifting, and in particular, to use the goods mounted on an object mounting unit connected to the end of a wire. The present invention relates to an anti-theft device.

[0002]

2. Description of the Related Art Conventionally, in a store where products such as portable tape recorders and shavers are displayed and sold, in order to protect these products from fraudulent acts such as shoplifting, FIG.
The following anti-theft device (10) is employed.

[0003] In this anti-theft device (10), a plurality of telescopic wires (50) in which conductors are embedded are attached to an alarm unit (40) to be fixedly installed on a display stand (not shown) for commodities. An object mounting unit (3) to which a product is to be mounted is connected to the distal end of each of the connected and extendable wires (50).

On the surface of the object mounting unit (3), a switch piece (31) is protruded. The alarm unit (40)
A buzzer (12) and a circuit board (48) are built in, and the switch piece (31) of the object mounting unit (3) and the circuit board (48) of the alarm unit (40) are connected by a telescopic wire (50). They are electrically connected to each other. The operation of the buzzer (12) is controlled by the circuit board (48) and sounds when a product is removed from the object mounting unit (3) or when the telescopic wire (50) is cut. is there.

In a store, goods are mounted on the object mounting unit (3) and displayed on a display stand. When selling goods to customers, the buzzer (12) is not sounded using jigs and tools. Then, the product is removed from the object mounting unit (3), and the product is handed to the customer in exchange for the price.

When the customer illegally removes the product from the object mounting unit (3), the switch piece (31) is turned off and a sounding command is issued to the circuit board (48). As a result, the buzzer (1
2) sounds, and the clerk can know that the product has been illegally removed from the object mounting unit (3).

[0007] When the telescopic wire (50) is cut, the switch piece (31) and the circuit board (48) are electrically disconnected, whereby a sounding command is issued to the circuit board (48). As a result, the buzzer (12) sounds, and the clerk can know that the telescopic wire (50) has been cut.

[0008]

However, in the conventional anti-theft device (10), if the covering material of the telescopic wire (5) is peeled off or burned to short-circuit the conducting wire,
There is a problem that an alarm is not issued even when the product is removed from the object mounting unit (3) or when the telescopic wire (5) is cut on the object mounting unit (3) side from the short-circuited portion. .

The present invention is to provide an anti-theft device capable of countering such misconduct.

[0010]

The anti-theft device according to the first aspect of the present invention comprises an object mounting unit to which an anti-theft object is to be mounted, an alarm unit to be fixed at a predetermined position, An anti-theft device comprising a wire that mechanically and electrically connects the object mounting unit and the alarm unit to each other, wherein the alarm unit has a first abnormal state in which the anti-theft object is removed from the object mounting unit; A second electrical connection between the object mounting unit and the alarm unit is cut at the wire portion;
An alarm is issued when an abnormal state, a third abnormal state in which the electrical connection between the object mounting unit and the alarm unit is short-circuited at the wire portion, or a fourth abnormal state in which the alarm unit is removed from a predetermined position. More specifically, the object mounting unit includes first switch means and first resistance means, and the alarm unit includes second switch means, second resistance means, and a power supply. Means, abnormality determination means, and sounding means, wherein the wire comprises a first conductor and a second conductor, the power supply means,
The second resistance means, the second switch means, the first conductor, the first resistance means, the first switch means, and the second conductor are connected in series in this order, and the first switch means and the second switch means are in a conductive state. Constitutes an abnormality detection loop in which the first abnormality is detected by determining a voltage level at a connection portion between the second resistance means and the second switch means in the abnormality detection loop. Disconnection of the first switch corresponding to the state, disconnection of the first conductor and / or second conductor corresponding to the second abnormal state, short circuit between the first conductor and the second conductor corresponding to the third abnormal state, Alternatively, the sounding means is operated by detecting the interruption of the second switch means corresponding to the fourth abnormal state.

Further, the anti-theft device according to the second aspect of the present invention comprises an object mounting unit to which an anti-theft object is to be mounted, an alarm unit to be fixed at a predetermined position, and the object mounting unit. And a wire for mechanically and electrically connecting the alarm unit to each other, wherein the alarm unit comprises: a first abnormal state in which an anti-theft object is removed from the object mounting unit; A second abnormal state where the electrical connection between the unit and the alarm unit is disconnected at the wire portion, or a third abnormal state where the electrical connection between the object mounting unit and the alarm unit is short-circuited at the wire portion is detected. In this case, an alarm is issued when the object is mounted. More specifically, the object mounting unit includes a first switch unit and a second switch unit. Resistance means, the alarm unit includes second resistance means, power supply means, abnormality determination means, and sounding means, the wire includes a first conductor and a second conductor, and the power supply means, second resistance The means, the first conducting wire, the first resistance means, the first switch means, and the second conducting wire are connected in series in this order to form an abnormality detection loop for making the state in which the first switch means conducts a normal state, The abnormality determination means determines a voltage level at a connection portion between the second resistance means and the second conductor in the abnormality detection loop, thereby shutting off the first switch means corresponding to the first abnormality state, Detecting a disconnection of the first conductor and / or the second conductor corresponding to the abnormal state, or detecting a short circuit between the first conductor and the second conductor corresponding to the third abnormal state, and operating the sounding unit. It is a feature.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 3, an anti-theft device (1) according to a preferred embodiment of the present invention includes an object mounting unit (3) to which a product is to be mounted, a display stand, a wall surface, and the like. And an alarm unit (4) to be fixed to the object, and a wire (5) for mechanically and electrically connecting the object mounting unit (3) and the alarm unit (4) to each other. In a store, the alarm unit (4) is fixed to a display stand or a wall surface of the product, and the product is mounted on the object mounting unit (3) and displayed.

A first switch piece (31) is projected from the casing surface of the object mounting unit (3), and a buzzer (11) in the alarm unit (4) is provided with a first switch piece (31). The sound does not sound in the ON state where 31) is pressed against the product and pushed into the inside of the casing, but sounds when the product is removed from the object mounting unit and the first switch piece (31) is turned off.

In the object mounting unit (3), a first resistor is connected in series with the first switch piece (31).
(Not shown) is connected.

The alarm unit (4) has a casing (49).
A buzzer (11), a circuit board (42), a battery (not shown), etc. are provided inside, and a plurality of sound emission holes (43) are provided on the surface of the casing (49).
Has been established. The circuit board (42) has a second resistor
(Not shown), voltage judgment circuit (not shown), buzzer drive circuit
(Not shown) is provided.

A second switch piece (41) is projected from the surface of the casing (49) of the alarm unit (4), and the buzzer (11) is provided with a second switch piece (41). No sound is emitted in the ON state where the switch is pressed into the casing (49) inside the fixed surface of the display stand or the like, but the alarm unit is removed from the display stand or the like and the second switch piece (41) is turned off. Sounds when it comes.

The wire (5) has a pair of conducting wires (not shown) embedded therein, and includes a connecting wire portion (51) and a telescopic wire portion (52).

Then, the end of the telescopic wire portion (52) of the wire (5) is connected to the object mounting unit (3), and the connecting wire portion
The end (6) (60) of the (51) is the connecting member (7) on the alarm unit (4) side
By being connected to (70), the object mounting unit (3)
And the alarm unit (4) are mechanically and electrically connected to each other via a wire (5).

The circuit configuration of the anti-theft device will be described with reference to FIG.

The object mounting unit (3) includes a first switch (31) and a first resistor (35), and includes an alarm unit (4).
Is a battery (44), a second resistor (45), a second switch (4
1), a voltage determination circuit (46), a buzzer drive circuit (47), and a buzzer (11), and the wire (5) includes a first conductor (53) and a second conductor (54).

The battery (44), the second resistor (45), the second switch (41), the first conductor (53), the first resistor (3)
5), the first switch (31) and the second conducting wire (54) are connected in series in this order, so that both the first switch (31) and the second switch (41) are closed. Construct an abnormality detection loop to make it normal. The resistance of each of the first resistor (35) and the second resistor (45) is several MΩ.

Here, assuming that the power supply voltage of the battery (44) is E0, the resistance of the first resistor (35) is R1, and the resistance of the second resistor (45) is R2, the second resistor Vessel (45) and the second switch (4
The voltage level E at the connection point (P) with (1) is, as shown in Table 1,

[0023]

[Table 1]

In a normal state in which the abnormality detection loop is closed, E = E0 ・ R1 / (R1 + R2), in a first abnormality state in which the first switch (31) is shut off, E = E0, and the first conductor ( 53)
And / or E = E0 in the second abnormal state in which the second conductor (54) is disconnected, and a third abnormal state in which the first conductor (53) and the second conductor (54) are short-circuited. , E = 0 in the fourth abnormal state in which the second switch (41) is shut off.
= E0.

The determination circuit (46) includes a second resistor (45) and a second resistor (45).
The voltage level E at the connection point (P) with the switch (41) is determined. If E = E0 · R1 / (R1 + R2), the buzzer drive circuit
(47) is not operated, and if E = E0 or E = 0, the buzzer drive circuit (47) is operated. The operation of the buzzer drive circuit (47) causes the buzzer (11) to sound.

In the above embodiment, the alarm unit
(4) The alarm unit (4) was provided with the second switch piece (41) in anticipation of an improper act of being detached from the display stand or wall surface. When the second switch piece (41) is completely fixed and the second switch piece (41) is unnecessary, for example, a circuit configuration as shown in FIG. 2 may be adopted.

In FIG. 2, a battery (44) and a second resistor (4
5), the first conductor (53), the first resistor (35), the first switch (31), and the second conductor (54) are connected in series in this order, and the first switch (31) is connected. ) Constitutes an abnormality detection loop that makes the closed state a normal state. The resistance value of each of the first resistor (35) and the second resistor (45) is several MΩ.

Here, assuming that the power supply voltage of the battery (44) is E0, the resistance of the first resistor (35) is R1, and the resistance of the second resistor (45) is R2, the second resistor The voltage level E at the connection point (Q) between the container (45) and the first conducting wire (53) is, as shown in Table 2,

[0029]

[Table 2]

In a normal state in which the abnormality detection loop is closed, E = E0 状態 R1 / (R1 + R2), in a first abnormality state in which the first switch (31) is shut off, E = E0, and the first conductor ( 53)
And / or E = E0 in the second abnormal state in which the second conductor (54) is disconnected, and a third abnormal state in which the first conductor (53) and the second conductor (54) are short-circuited. , E = 0.

The decision circuit (46) includes a second resistor (45) and a first resistor (45).
The voltage level E at the connection point (Q) with the conducting wire (53) is determined. If E = E0 · R1 / (R1 + R2), the buzzer drive circuit (47)
Is not operated, and if E = E0 or E = 0, the buzzer drive circuit (47) is operated. The operation of the buzzer drive circuit (47) causes the buzzer (11) to sound.

[0032]

According to the present invention, the object mounting unit to which the anti-theft object is to be mounted, the alarm unit to be fixed at a predetermined position, and the object mounting unit and the alarm unit are mechanically and electrically connected to each other. An anti-theft device including a wire that is electrically connected, an object to be stolen is removed from the object mounting unit, an electrical connection between the object mounting unit and the alarm unit is cut off at the wire portion, or the alarm unit is set to a predetermined position. Not only the wrongful act of removing from the position, but also shorting the conductor inside by peeling or burning the wire covering material, removing the product from the object mounting unit, Anti-theft device that issues an alarm even if the object mounting unit is cut off It is.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of an anti-theft device according to a first embodiment of the present invention.

FIG. 2 is a circuit configuration diagram of an anti-theft device according to a second embodiment of the present invention.

FIG. 3 is a perspective view of the anti-theft device according to the first embodiment of the present invention;

FIG. 4 is a perspective view of a conventional anti-theft device.

[Explanation of symbols]

 (1) Anti-theft device (11) Buzzer (3) Object mounting unit (31) First switch (35) First resistor (4) Alarm unit (41) Second switch (44) Battery (45) Second Resistor (5) Wire (51) First conductor (52) Second conductor

Claims (4)

[Claims] 1. An object mounting unit to which an anti-theft object is to be mounted, an alarm unit to be fixed at a predetermined position, and wires for mechanically and electrically connecting the object mounting unit and the alarm unit to each other. In the anti-theft device comprising: the alarm unit, the anti-theft object is removed from the object mounting unit in a first abnormal state, and the electrical connection between the object mounting unit and the alarm unit is disconnected at the wire portion Detected second abnormal state, a third abnormal state in which the electrical connection between the object mounting unit and the alarm unit is short-circuited at the wire portion, or a fourth abnormal state in which the alarm unit is removed from a predetermined position. An anti-theft device that issues an alarm when it is activated. 2. The object mounting unit comprises a first switch means and a first resistance means, and the alarm unit comprises a second switch means.
A switch means, a second resistance means, a power supply means, an abnormality determination means, and a sounding means, wherein the wire comprises a first conductor and a second conductor, the power supply means, the second resistance means, the second switch means, First
The conducting wire, the first resistance means, the first switching means, and the second conducting wire are connected in series in this order to form an abnormality detection loop that sets a state in which the first switching means and the second switching means are conducted to a normal state, The abnormality determination unit determines a voltage level at a connection portion between the second resistance unit and the second switch unit in the abnormality detection loop, thereby shutting off the first switch unit corresponding to the first abnormal state. Disconnection of the first conductor and / or the second conductor corresponding to the second abnormal state, short-circuit between the first conductor and the second conductor corresponding to the third abnormal state, or the fourth
2. The anti-theft device according to claim 1, wherein the sounding unit is operated by detecting the interruption of the second switch unit corresponding to the abnormal state. 3. An object mounting unit to which an anti-theft object is to be mounted, an alarm unit to be fixed at a predetermined position, and a wire for mechanically and electrically connecting the object mounting unit and the alarm unit to each other. In the anti-theft device comprising: the alarm unit, the anti-theft object is removed from the object mounting unit in a first abnormal state, and the electrical connection between the object mounting unit and the alarm unit is disconnected at the wire portion An anti-theft device that issues an alarm when a detected second abnormal state or a third abnormal state in which the electrical connection between the object mounting unit and the alarm unit is short-circuited at the wire portion is detected. 4. The object mounting unit includes a first switch unit and a first resistance unit, and the alarm unit includes a second switch unit.
A resistance means, a power supply means, an abnormality determination means, and a sounding means, wherein the wire comprises a first conductor and a second conductor, the power supply means, the second resistance means, the first conductor, the first resistance means, The one switch means and the second conductor are connected in series in this order to form an abnormality detection loop that sets a state in which the first switch means conducts to a normal state. By determining the voltage level at the connection between the two resistance means and the second conductor, the first switch means corresponding to the first abnormal state is shut off, and the first conductor corresponding to the second abnormal state and / or the first conductor means are determined. 4. The anti-theft device according to claim 3, wherein the sounding means is operated by detecting disconnection of the second conductor or a short circuit between the first conductor and the second conductor corresponding to the third abnormal state.