JP4010205B2 - Anti-theft device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an anti-theft device that detects a different state due to removal of a tag that is detachably attached to an article that is subject to anti-theft, and issues an alarm according to the change in the state.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a theft prevention device is known in which a tag is detachably attached to an article, a different state due to tag removal is electrically detected, and an alarm is issued according to the state change. For example, in Japanese Patent No. 2799136 “Anti-Theft Device”, a tag that is detachably attached to an article and can take different states upon removal, an alarm means that issues an alarm, a different state connected to the tag is detected, and its state changes Control means for controlling the alarm means according to the tag, the tag has an adhesive layer, a conductive layer formed on the adhesive layer, and a substrate formed on the conductive layer, When the adhesive layer surface is pasted and the resistance value of the conductive layer is detected by the control means and the state becomes different, the alarm means can be driven.
[0003]
[Problems to be solved by the invention]
By the way, in this antitheft device, the tag is expected to be bent when attached to the article, and the resistance value of the conductive layer during manufacture may change due to this bending. When the resistance value of the tag changes, it becomes difficult to control, for example, voltage adjustment assuming a voltage drop corresponding to the resistance value change is required. Also, if the resistance value is different for each tag, there is a disadvantage that an error occurs in the determination of whether or not there is an abnormality when the control is performed by a common control means. In addition, when attaching to an article, handling is required so as not to cause bending or the like.
[0004]
Further, when detecting the resistance value of the conductive layer, there is a problem that the resistance value is likely to change in the conductive layer due to bending other than when an abnormality occurs such as peeling off the tag, and a false alarm is generated. For example, in clothing or the like where the article to which the tag is attached is flexible, the tag is easily bent together with the article. If the bending causes a change in the resistance value of the conductive layer, this causes a malfunction.
[0005]
Accordingly, an object of the present invention is to provide an anti-theft device that stabilizes detection and facilitates handling.
[0006]
[Means for Solving the Problems]
The configuration of the present invention that solves such a problem is as follows.
[0007]
The anti-theft device of the present invention comprises conductor patterns 10 and 12 together with an adhesive layer 22 on an insulating material (insulating film 16) having flexibility, and is removably attached to the article 8 by the adhesive layer. A tag 2 that exhibits a state, and a control means (control device 42) that monitors a resistance value R of the resistor 24 connected via the conductor pattern of the tag and generates a control output in accordance with the change in the state; The alarm means (alarm device 46) for issuing an alarm by the control output generated by the control means, and the relay member (connector case 4) connecting the control means and the tag and having the resistor installed. It is characterized by that.
[0008]
In this antitheft device, the conductor pattern on the tag is a conduction path between the control means and the resistor, and is a removal detection means that exhibits a different state depending on the removal from the article. The control means monitors the resistance value R of the resistor. Therefore, when the resistance value R of the resistor is normal, the resistance value is in an abnormal state, that is, when the conductor pattern or wire is cut, when the resistance value is infinite, or when the conductor pattern or wire is short-circuited. It becomes a zero state. Each of these states is electrically detected by the control means.
[0009]
Therefore, in this anti-theft device, there is no change in resistance value except when an abnormality occurs such as peeling off a tag, cutting or short-circuiting a wire, and no malfunction occurs. Moreover, even if the article to which the tag is attached is flexible clothing or the like, the resistance value does not change due to the bending of the tag, and no malfunction occurs.
[0010]
In the anti-theft device of the present invention, since the relay is provided with a relay member (connector case 4) for connecting the control means and the tag , the tag and the resistor can be separated. If separated from the resistor, the tag can be made of a flexible film-like insulating material that conforms to the surface of the article, and a desired form such as easy or difficult removal can be easily realized. Even when the tag is bent, the resistance value does not change, and the alarm means does not malfunction.
[0011]
In the antitheft device of the present invention, the conductor pattern includes a plurality of bent portions 14. That is, since the conductor pattern has a plurality of bent portions when the tag is peeled off, the conductor pattern is easily peeled off, and the detection accuracy can be improved and the alarm means can be operated.
[0012]
In the anti-theft device according to the present invention, the bent portion is formed at least on the tip side of the tag. That is, since the bent portion of the conductor pattern is formed on the tip side of the tag, the peelability of the conductor pattern can be improved and the detection accuracy can be improved.
Further, in the anti-theft device of the present invention, an auxiliary fixing part protrudes in the vicinity of a part where the tag is attached to the relay member, and an adhesive layer is formed on the auxiliary fixing part to fix the tag together with the tag. It is characterized by.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an antitheft device according to an embodiment of the present invention. This anti-theft device comprises a sheet-like tag 2, a connector case 4 as a relay member, and a device body 6 as a control means and an alarm means.
[0014]
The tag 2 is detachably attached to the article 8 to be prevented from being stolen, and is attached to the connector case 4 by the attachment portion 3. The tag 2 is provided with conductor patterns 10 and 12 made of a conductor layer formed by printing or the like as a means for detecting the removal from the article 8, that is, as a removal detecting means that exhibits a different state by peeling. Each conductor pattern 10, 12 is provided with a plurality of bent portions 14. The attachment portion 3 is formed with a restraining projection 5 that prevents the connector case 4 from being detached.
[0015]
For example, as shown in FIG. 2, the tag 2 uses an insulating film 16 as a flexible insulating material made of an insulating material, and a plurality of peelings made of an insulating material that can be peeled off on the surface of the insulating film 16. The ink printing layer 18 is disposed discontinuously with an arbitrary interval d, and the conductor patterns 10 and 12 are disposed across the peeling ink printing layer 18. In this embodiment, the interval d between the release ink print layers 18 is set smaller than the length L of the release ink print layer 18 (L> d), but is equal to the length L of the release ink print layer 18. Or you may set large (L <= d). An adhesive layer 22 is formed so as to cover the surfaces of the conductor patterns 10 and 12. Therefore, the tag 2 is detachably attached to the article 8 with the adhesive layer 22.
[0016]
The connector case 4 is, for example, a synthetic resin casing that is installed between the tag 2 and the apparatus main body 6. A resistor 24 is installed inside the connector case 4. A cable 30 having 26 and 28 is connected to a horn plug 32 which is a connection means with the apparatus main body 6, and a resistor 24 is connected to the other end of the conductors 26 and 28 via conductor patterns 10 and 12 of the tag 2. Is connected.
[0017]
For example, as shown in FIG. 3A, the connector case 4 has an insertion portion 34 for inserting the mounting portion 3 of the tag 2 and is engaged with the restraining projection 5 to maintain the locked state. A lock portion 36 is provided as a mechanism, and a lock piece 40 is provided on the lock portion 36 as means for maintaining the locked state by being pushed into the notch 38 of the connector case 4. Therefore, as shown in FIG. 3 (B), when the mounting portion 3 of the tag 2 is pushed into the insertion portion 34 of the lock portion 36, the lock portion 36 is inserted into the connector case 4 as shown in FIG. 3 (C). The tag 2 is connected to the connector case 4 by the lock piece 40 being pushed into the notch 38.
[0018]
The apparatus body 6 is provided with a control device 42 that detects a change in state generated on the tag 2 side and generates an alarm signal. For example, a microcomputer is used for the control device 42 to store the initial state. A storage unit 44 is installed, and an alarm unit 46 including an alarm buzzer and an alarm lamp is connected as an alarm unit that operates according to an alarm signal. The device body 6 is provided with a resistor 50 together with a power supply device 48 that generates a constant voltage V. Between the resistor 50 and a ground point (GND), a horn plug 32, a cable 30, A resistor 24 is connected through the conductors 26 and 28 and the conductor patterns 10 and 12, and a constant voltage V is applied to the series circuit of the resistors 50 and 24 from the power supply device 48. The voltage Vn generated at the voltage dividing point n between the resistors 50 and 24 is applied to the A / D converter input section of the control device 42 and converted into a digital value.
[0019]
In such a configuration, the operation will be described. In a normal state, the state shown in FIG. The voltage applied from the power supply device 48 is V, the resistance values of the resistors 50 and 24 are R, the resistance values r of the cable 30 and the conductor patterns 10 and 12 are r << R, and can be ignored with respect to the resistance value R. If so, the detection voltage Vn applied to the control device 42 through the voltage dividing point n is
Vn = V × (R / 2R) = V / 2 (1)
It becomes. For example, when R = 2.2 [kΩ] and V = 3.3 [volt], Vn = 1.65 [volt].
[0020]
Therefore, in the initial setting, when the tag 2 is connected to the apparatus body 6 via the connector case 4, the detection voltage Vn generated at the voltage dividing point n is captured, and the initial voltage value is converted into a digital value. Each tag 2 is stored in the storage means 44. Then, a voltage range (Vr ± ΔV) obtained by adding an allowable voltage fluctuation range ± ΔV (for example, within ± 0.4 [volt]) that can be regarded as normal to the initial value Vr is set as a normal reference voltage range. The This voltage range (Vr ± ΔV) is stored in the storage means 44 as a digital value. When the detected voltage Vn deviates from this voltage range (Vr ± ΔV), it is determined as abnormal and an alarm signal is issued. In this case, the voltage range (Vr ± ΔV) is a value determined individually for each tag 2 when a plurality of tags 2 are used.
[0021]
When the cable 30 is cut or a part or all of the conductor patterns 10 and 12 are broken (disconnected) by removing the tag 2 at the time of abnormality, the resistor 24 is detached as shown in FIG. 4B, for example. Will do. At this time, the resistance value R between the voltage dividing point n and the ground point (GND) becomes infinite, and the detection voltage Vn applied to the control device 42 through the voltage dividing point n becomes the voltage V of the power supply device 48. That is, when Vn = V and V = 3.3 [volt], Vn = 3.3 [volt].
[0022]
Further, when the conductor patterns 10 and 12 and the cable 30 are short-circuited by removing the tag 2 or operating from the outside in the event of an abnormality, the resistor 24 is short-circuited as shown in FIG. The resistance value R between the point n and the ground point (GND) becomes zero, and the detection voltage Vn applied to the control device 42 through the voltage dividing point n becomes zero. That is, Vn = 0.
[0023]
As described above, Vn = V / 2 [volts] in the normal state and Vn = V [volts] or Vn = 0 [volts] in the abnormal state, so that the resistance value R of the resistor 24 between the conductor patterns 10 and 12 is obtained. The control device 42 can determine whether the voltage is normal or abnormal based on the value of the detection voltage Vn at the voltage dividing point n that represents a change in state. In addition to these, when the detection voltage Vn fluctuates outside the voltage range (Vr ± ΔV), which is an added value of the initial value Vr and the allowable voltage fluctuation range ± ΔV, an abnormal state is detected.
[0024]
When these abnormalities occur, an alarm signal is issued from the control device 42, and the alarm device 46 can receive an alarm signal and issue an alarm to notify the abnormal situation.
[0025]
Further, in this embodiment, since the plurality of release ink print layers 18 are provided with an arbitrary interval d between the conductor patterns 10 and 12 and the insulating film 16, the tag attached to the article 8. When 2 is peeled off, the conductor patterns 10 and 12 are easily torn at the cut portion of the release ink printing layer 18 (that is, the portion of the interval d), causing the state change shown in FIG. Detection accuracy can be increased.
[0026]
In addition, the conductor patterns 10 and 12 formed in a circular shape on the insulating film 16 have a plurality of bent portions 14 and also have a bent portion 14 on the front end side of the tag 2. It is easy to tear and the detection accuracy of the abnormal state is improved.
[0027]
As a method for manufacturing the tag 2, for example, the release ink print layer 18 is formed on the insulating film 16 by printing, and the conductor patterns 10 and 12 are formed thereon by printing. Then, the release ink print layer 18 and the conductor are formed. The uniform tag 2 can be manufactured by a manufacturing method in which the adhesive layer 22 is formed so as to cover the patterns 10 and 12.
[0028]
Moreover, according to such a tag 2, when the adhesive layer 22 deteriorates, the tag 2 deteriorated by unlocking can be removed from the connector case 4 and easily replaced, and stable detection accuracy can be maintained. it can.
[0029]
For the tag 2, as an embodiment, for example, as shown in FIG. 5, a pair of auxiliary fixing portions 54 that are substantially parallel to the mounting portion 3 may protrude from the main body 52 side to the mounting portion 3 side. The attachment strength of the tag 2 can be increased by forming the adhesive layer 22 on each auxiliary fixing portion 54 and attaching each auxiliary fixing portion 54 to the article 8 to be prevented from theft. In this way, it is possible to prevent inconvenience such as the tag 2 being inadvertently peeled off by the operation of the article 8.
[0030]
In the embodiment shown in FIG. 1, the mounting portion 3 is formed at one end of the tag 2, and the resistor 24 is installed in the connector case 4 to which the mounting portion 3 is mounted. For example, as shown in FIG. In addition, a mounting portion 56 and a restraining protrusion 58 are formed at the other end of the tag 2, and an auxiliary case 60 that is attached to the mounting portion 56 and is locked by the restraining protrusion 58 is installed therein. A resistor 24 may be installed. The resistor 24 is connected between the conductor patterns 10 and 12 of the mounting portion 56 in the auxiliary case 60. Even in this configuration, an abnormal state such as peeling of the tag 2 can be detected electrically by monitoring the resistance value of the resistor 24.
[0031]
Further, although not shown, the resistor 24 may be installed on the insulating film 16 of the tag 2 and connected between the conductor patterns 10 and 12. In this way, the same effect that an abnormal state can be detected by monitoring the resistance value of the resistor 24 can be expected, and a case for installing the resistor 24 becomes unnecessary, and the antitheft device is compact. Can be achieved.
[0032]
Further, although the conductor patterns 10 and 12 are configured to circulate in the longitudinal direction of the tag 2, they may be configured to bend in a zigzag shape in the width direction of the tag 2.
[0033]
【The invention's effect】
As described above, according to the present invention, the following effects can be obtained.
a It is possible to realize an anti-theft device that stabilizes detection and facilitates handling.
b Since the resistance value of the resistor is difficult to change even if it is bent by mistake when attached to an article, the driving of the alarm means can be easily controlled, and even when a plurality of tags are used Can be easily controlled.
c Even when the attachment portion to the article is flexible, the resistance value of the resistor is difficult to change when bent, so that the alarm means does not malfunction and the reliability can be improved.
[Brief description of the drawings]
FIG. 1 is a circuit diagram showing an outline of an antitheft device according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing the structure of a tag.
FIGS. 3A and 3B are perspective views showing attachment and detachment of a connector case and a tag, wherein FIG. 3A is a perspective view before mounting, FIG. 3B is a perspective view before locking, and FIG. 3C is a connector case and tag; It is a perspective view which shows the mounting state of.
4A and 4B are circuit diagrams showing the operation of the anti-theft device, where FIG. 4A is a circuit diagram showing normal operation, FIG. 4B is a circuit diagram showing operation at break (disconnection), and FIG. It is a circuit diagram which shows operation | movement.
FIG. 5 is a plan view showing a tag according to another embodiment.
FIG. 6 is a diagram illustrating a tag according to another embodiment.
[Explanation of symbols]
2 Tag 4 Connector case (relay member)
8 Articles 10 and 12 Conductor pattern 14 Bent part 16 Insulating film (insulating material)
22 Adhesive layer 24 Resistor 42 Control device (control means)
46 Alarm (alarm means)

Claims (4)

A tag that is provided with a conductive pattern together with an adhesive layer on a flexible insulating material and is detachably attached to the article by the adhesive layer, and presents a different state upon removal;
Control means for monitoring a resistance value of a resistor connected through the conductor pattern of the tag and generating a control output according to a change in the state;
Alarm means for issuing an alarm according to the control output generated by the control means;
Connecting the control means and the tag, and a relay member provided with the resistor;
An antitheft device characterized by comprising:   The antitheft device according to claim 1, wherein the conductor pattern includes a plurality of bent portions.   The antitheft device according to claim 2, wherein the bent portion is formed at least on a tip side of the tag. The auxiliary fixing part protrudes in the vicinity of the mounting part of the tag with the relay member, and an adhesive layer is formed on the auxiliary fixing part to fix the tag together with the tag. 4. The antitheft device according to 3 .

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