JP2003109133A - Burglary preventing tag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a burglary preventing tag which is inexpensive and compact and can effectively be used especially for a thin planar commodity by forming a tag main body in a planar shape and constituting a detection resonance circuit of a detection coil, a resonance coil and a capacitor, which can be disposed in the storage case of cosmetics and the storage case of various videos and can be used for the storage cases (protection cases) of various commodities by forming it in an L shape or a U shape and which can easily change and set the resonance frequency by changing the number of wirings of the resonance coil and the capacitance of the capacitor. SOLUTION: The burglary preventing tag is characterized in that it is provided with the detection resonance circuit constituted of the coil and the capacitor on the surface or inside the tag main body made of a synthetic resin and the like in planar shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-theft tag which is provided in a protective case for various products, and which is used in a crime prevention system which warns when a gate installed in a store or a rental store is passed. It is about.

[0002]

2. Description of the Related Art As a conventional technique, Japanese Patent Laid-Open No. 11-12
A storage case for storing a recording medium such as a CD or a protective case for covering the storage case is provided between one gate having a transmitting antenna and the other gate having a receiving antenna as described in Japanese Patent No. 6283. In an anti-theft system capable of detecting the presence or absence of radio wave absorption by passing through a resonance circuit, a detection circuit located at the outer peripheral edge of at least one side of the storage case on both sides in the recording medium thickness direction and capable of detecting radio waves. And a resonance circuit that is located on a specific side surface that intersects with one side surface of the storage case and that is located close to the detection circuit or that is connected to the detection circuit. There are some that are characterized by.

However, the above-described form is limited to a storage case for storing a recording medium such as a CD or a protective case for covering the storage case, and is compatible with other product storage cases (particularly Thin flat products) are not possible.
Also, on one specific side that intersects with one side of the storage case,
This is a form in which the detection circuit and the resonance circuit are separately provided, which complicates the configuration and increases the cost. Further, it is difficult to put it in a storage case or a protective case and take it out due to its shape.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to form a tag body in a flat plate shape and to provide a detection resonance circuit with a detection circuit using a detection coil. By using a resonance circuit composed of a resonance coil and a capacitor, the resonance circuit can be made inexpensive and compact, and can be effectively used especially for thin flat products. Further, by forming it into an L-shape or a U-shape, it can be provided in a cosmetic storage case or various video storage case, and a storage case (protective case) for a wide variety of products.
It is intended to provide an anti-theft tag that can be used for any of the above and can easily change and set the resonance frequency by changing the number of turns of the resonance coil and the capacity of the capacitor.

[0005]

As means for solving the problems, a detection resonance circuit composed of a coil and a capacitor is provided on the surface or inside of a flat plate-shaped tag body made of synthetic resin or the like. Further, the detection resonance circuit should be composed of a detection circuit using a detection coil and a resonance circuit composed of a resonance coil and a capacitor. A hole must be provided inside the tag body. A detection circuit using a detection coil should be provided near the outer circumference of the tag body. In addition, it should be bent from the center of the tag body to form an L shape. The tag body should be bent at a position where it can be divided into approximately three parts, and formed into a U-shape. Furthermore, the tag body is transparent. In addition, one detection coil is used for the detection circuit.
It is characterized in that the resonance frequency can be changed and set by changing the number of turns of the resonance coil and the capacitance of the capacitor in the resonance circuit and combining them.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The anti-theft tag 1 has a large inner hole 2 made of a transparent synthetic resin or the like having an appropriate elastic force.
Detection of a single winding formed in a loop shape on the outer periphery or inner side of the flat plate-shaped tag body 2 provided with a (in the case of this embodiment, the lower end of each side is cut out in the form of being put in a CD protective case) The resonance coil 4a is added to the detection circuit 3 including the resonance coil.
And a detection resonance circuit 5 including a resonance circuit 4 including a capacitor 4b. The detection resonance circuit 5 may be directly fixed to the surface of the tag body 2 with an adhesive or the like, may be fixed by laminating, or may be internally provided in the tag body 2 by insert molding. Further, the number of turns of the resonance coil 4a in the resonance circuit 4 and the capacitor 4
The resonance frequency can be changed and set by changing and combining the capacities of b.

The antitheft tag 1 is used by putting it in a CD protective case K which is generally commercially available.
A finger is inserted through the through hole K1 of the D protection case K, and the CD storage case (not shown) inserted therein is removed through the hole 2a of the antitheft tag 1. In addition, the surface area of the tag body 2 can be reduced by the hole 2a, and fogging due to friction with the CD storage case (the title of the CD cannot be seen) can be minimized. Furthermore, the anti-theft tag 1 informs that the resonance frequencies match when it passes through a gate (a form having a built-in transmitting / receiving antenna) installed in a rental store or the like, and is known to a clerk to prevent theft. Can be prevented.

Next, another anti-theft tag will be described. The anti-theft tag 21 is made of the same material as that described above and is formed by bending the tag body 22 from the vicinity of the center to form an L-shape.
The detection resonance circuit 25 is formed by providing the resonance circuit 24 composed of 4a and the capacitor 24b. The tag body 22
The detection resonance circuit 25 is provided inside or on the surface of the device and then formed into an L shape. The anti-theft tag 21 is used by being provided at a corner portion on the back surface of a case having a relatively large thickness.

The anti-theft tag 31 is formed by forming the tag main body 32 into a U-shape, and is used by being put inside according to a storage case for cosmetics or the like.

In each of the above-described embodiments, the tag body may be other than the transparent one, and may be colored with characters or pictures printed. Further, the size of the tag body may be set according to the size of the storage case or protection case of each product used.

[0011]

1) The tag body is formed in a flat plate shape, and the detection resonance circuit including the detection circuit including the detection coil and the resonance circuit including the resonance coil and the capacitor is provided. . 2) In particular, when using a recording medium such as a CD in a storage case or a protective case, since it has a flat plate shape, it can be used regardless of the thickness of each case and is particularly effective for a thin product case. . 3) By providing a hole in the tag body, the tag body can be used as a hole protection case and can prevent fogging due to friction between the tag body and the CD storage case. 4) By forming the anti-theft tag in an L shape,
It can be used on the back corners of thick product cases such as ornamental video cases. 5) By forming the anti-theft tag in a U-shape, the anti-theft tag can be used by fitting it to a case such as a cosmetic (for example, lipstick) having a shape matched to its thickness. 6), the detection coil in the detection circuit is wound once,
By changing and combining the number of turns of the resonance coil and the capacitance of the capacitor in the resonance circuit, the resonance circuit can be made compact, the resonance frequency can be changed and set, and gates of various frequencies can be supported.

[Brief description of drawings]

FIG. 1 is a front view of a theft prevention tag showing a first embodiment of the present invention.

FIG. 2 is a bottom view of the anti-theft tag showing the first embodiment of the present invention.

FIG. 3 is a view showing the usage state of the anti-theft tag according to the first embodiment of the present invention.

FIG. 4 is a perspective view of an anti-theft tag showing a second embodiment of the present invention.

FIG. 5 is a perspective view of an anti-theft tag showing a third embodiment of the present invention.

[Explanation of symbols]

1 --- Anti-theft tag 2 --- Tag body 2a-hole 3 --- Detection circuit 4a--Resonance coil 4b--Capacitor 4 --- Resonance circuit 5 --- Detection resonance circuit K --- Protective case K1--through hole

Continued front page    F term (reference) 5B035 AA04 BB09 BC00 CA08 CA11                       CA23                 5C084 AA03 AA09 AA14 BB23 BB33                       CC35 DD08 EE01 EE07 FF03                       FF20 GG54 GG71 HH01 HH13

Claims (8)

[Claims] 1. A theft-prevention tag, characterized in that a detection resonance circuit comprising a coil and a capacitor is provided on or inside a flat plate-shaped tag body made of synthetic resin or the like. 2. The anti-theft tag according to claim 1, wherein the detection resonance circuit includes a detection circuit including a detection coil and a resonance circuit including a resonance coil and a capacitor. 3. The anti-theft tag according to claim 1, wherein a hole is provided inside the tag body. 4. A detection circuit including a detection coil is provided near the outer circumference of the tag body.
Or the anti-theft tag described in 3. 5. The anti-theft tag according to claim 1, wherein the tag body is bent in the vicinity of the center and formed into an L shape. 6. The anti-theft tag according to claim 1, wherein the tag main body is bent at a position where it can be substantially divided into three, and is formed in a U-shape. 7. The antitheft tag according to claim 1, 2, 3, 4, 5, or 6, wherein the tag body is transparent. 8. The resonance frequency can be changed and set by changing the number of turns of the resonance coil and the capacitance of the capacitor in the resonance circuit by combining the detection coil in the detection circuit once. ,
The anti-theft tag described in 2, 3, 4, 5, 6 or 7.