JPH07320978A - Shoplifting preventing electric resonant tag using comb-shaped capacitor and comb-shaped capacitor - Google Patents

Abstract

PURPOSE:To improve the sensing power of a shoplifting preventing electric resonant tag and to provide a capacitor for preventing the occurrence of eddy currents. CONSTITUTION:A coil 20 is provided on one surface 10a of a dielectric film 10 and one electrodes 31a and 32a of capacitors 31 and 32 are respectively provided at both ends of the coil 10. The electrodes 31a and 32a have comb- shaped notches 33. In addition, the other electrodes 31b and 32b of the capacitors 31 and 32 are provided on the rear surface 10b of the film 10 so that the electrodes 31b and 32b can be respectively faced to the electrodes 31a and 32a. the electrodes 31b and 32b also have comb-shaped notches 33. Finally, a capacitor coupling section 34 couples the electrodes 32a and 32b of the capacitor 32 on the rear surface 10b of the film 10 to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to a resonance tag and a comb-shaped capacitor of an electric resonance device, and particularly to an electric resonance tag for electronically monitoring and checking illegal activities such as shoplifting prevention and other confirmations. It is about. In particular, the present invention relates to an electric resonance tag in which a comb-shaped cut for combing hair is made in a capacitor of an LC circuit of the electric resonance tag.

[0002]

2. Description of the Related Art Heretofore, in this technology, Japanese Patent Application No. Sho 6 is a patent application filed by the same inventor as the applicant and the applicant for the patent.
1-037251 and many others. These are mainly circuits formed by melting an aluminum foil provided on a dielectric film by etching. Of course, circuits using typical coils and capacitors are also available for high-end products, but the major problem is the inexpensive electric resonance tag. Of course, as a capacitor itself, its unprecedented new thinking and discovery is a breakthrough technology that can be applied to many fields in the future. Then, one side of the dielectric film is provided with the coil and one of the electrodes of the capacitor connected to the one end, and the other side of the film of the dielectric is provided with the other of the electrodes of the capacitor so that the other side of the electrode and the coil is provided. The ends are electrically coupled. There are two types of electrical coupling, one for direct conduction and one for inductive coupling in the form of a capacitor. And, this capacitor is an ordinary one that spreads in a plane and has not been subjected to any special treatment.

[0003]

In the former method, the dielectric film is mechanically destroyed from the outside so that the aluminum foils are forcibly and directly electrically coupled to each other. This is to adjust the destruction force. Is very delicate, so we often produce defective products due to poor insulation. Further, in this case, since the etching amount is large, there are many causes of process difficulty and quality instability due to the etching amount. On the other hand, in the latter case, since the increased capacitor has to be provided in the coil, the Q of the coil is lowered. Furthermore, the inductive coupling itself reduces its power. In the case of an electrical resonance circuit formed by etching an aluminum foil provided on this dielectric film by etching, basically, the area of the capacitor becomes a problem, and miniaturization becomes very difficult. Was a technical obstacle. The reason for this is as a result of recent experimental research that the problem of "eddy current" occurring in the capacitor is understood. Furthermore, today, when the cost of human rights is soaring, there is a strong demand for a labor-saving automatic destructive tag that does not require the troublesome work of removing the tag from the product when buying or selling the product.

Now, let us compare the tags (label sensors) implemented by the patent applicant of the present invention. 1. The first label sensor has two capacitors in series. Its advantage is that etching is easy (the amount of etching is small because the capacitor is small), and the number of processing steps is small and the quality is stable. On the other hand, its disadvantage is that since the area of the capacitor in the coil is large, the Q is low and the sensing power is low. The 2nd and 2nd generation label sensors (current ones) have a single capacitor by providing a conducting part on part of the front and back. Its advantage is that the large space area in the coil results in a high Q and a high sensing power. On the other hand, the disadvantage is that the cost and productivity are directly affected because one process (conduction process) is added, and the variation of the sensing force is generated due to the variation of the conduction process (conduction resistance). (Incomplete) Other problems occur, and the large etching area reduces productivity, making quality control difficult. In the label sensor for sale, which can be mass-produced by utilizing only the advantages of the above-mentioned two parties, there is a great demand for a small number of steps, stable quality, and easy manufacture.

[0005]

In view of the above-mentioned problems, the shoplifting prevention electric resonance tag using the comb-shaped capacitor and the comb-shaped capacitor according to the present invention are designed to prevent the eddy current generated in the capacitor. It is a "comb-shaped" notch for combing hair in the resonance circuit capacitor. In particular, the invention of claim 2 is such that the skew-like notches are formed at right angles to the electrodes of the respective capacitors facing each other. This is intended to minimize the adverse effects of the positional deviation in manufacturing.

That is, when a comb-shaped cut was made to prevent eddy currents from being generated in the capacitor, it was confirmed that the Q value was greatly increased. If the comb-shaped notch is in the same direction in both electrodes, the slight positional deviation causes variations in the capacitance of the capacitor. Since it is difficult to prevent this variation in this state, it is possible to greatly reduce the variation in the capacitance of the capacitor by making it orthogonal. Moreover, this configuration is very easy.

[0007] Specific configurations of the shoplifting-preventing electric resonance tag using the comb-shaped capacitor and the comb-shaped capacitor according to the present invention will be described below in detail. First, the constitution of the invention of the shoplifting-preventing electric resonance tag using the comb-like capacitor according to claim 1 of the present invention will be described. This is firstly an electrically insulating film. Next is the coil. This coil is provided on one surface of the electric insulating film. And, there is one of each of the electrodes of each capacitor. One of each of the electrodes of these capacitors is
The coil is provided at both ends of the coil and has a comb-shaped notch. In addition, there is each other of the electrodes of each capacitor. The other of the electrodes of these capacitors is a position that opposes one of the electrodes of the respective capacitors, is provided on the back surface of the above-mentioned electrical insulating film, and has a comb-shaped notch. It's in. Finally, there is the capacitor coupling. The capacitor coupling part connects the respective electrodes of the backside capacitor.

[0008] Next, the structure of the invention of the shoplifting-preventing electric resonance tag using the comb-shaped capacitor according to the present invention will be described. . The present invention has the same configuration as the invention of claim 1 except for the following points. Therefore, from the whole sentence of the description of the configuration of the invention of claim 1 above, except for the following points, it is incorporated herein, and the following description of the configuration is added thereto. The difference is the presence of the capacitor cut direction as described above. These two cuts are in a direction orthogonal to the cuts of the electrodes facing each other.

Then, the structure of the invention of the shoplifting-preventing electric resonance tag using the comb-shaped capacitor according to the present invention will be described. The present invention has the same configuration as the invention of claim 1 except for the following points. Therefore, from the whole sentence of the description of the configuration of the invention of claim 1 above, except for the following points, it is incorporated herein, and the following description of the configuration is added thereto. The difference is the above-mentioned electrical conduction point in place of the above-mentioned one capacitor. The electrical conduction point is such that the other electrode of the capacitor is directly electrically coupled to the other end of the coil. Therefore,
The capacitor coupling part of the invention of claim 1 does not exist.

Further, the structure of the invention of the shoplifting-preventing electric resonance tag using the comb-shaped capacitor according to the present invention will be described. This invention has the same structure as the invention of claim 2 except for the following points. Therefore, from the whole sentence of the description of the configuration of the invention of claim 2 described above, the following points are excluded from the whole sentence, and the following description of the configuration is added thereto. The difference is the above-mentioned electrical conduction point in place of the above-mentioned one capacitor. The electrical conduction point is such that the other electrode of the capacitor is directly electrically coupled to the other end of the coil.

The structure of the comb-shaped capacitor according to the present invention will be described. First, there is an electrically insulating film. Next, there is one electrode of the capacitor. One electrode of this capacitor is provided on one surface of the above-mentioned electric insulating film and has a comb-shaped notch. And there is the other electrode of the above capacitor. The other electrode of this capacitor is provided at a position opposed to one electrode of the above capacitor and is provided on the other surface of the above-mentioned electric insulating film, and has a comb-shaped notch. is there.

Further, the structure of the invention of a comb-shaped capacitor according to claim 6 of the electric resonance tag for shoplifting prevention and the comb-shaped capacitor using the comb-shaped capacitor according to the present invention will be described. This invention has the same structure as the invention of claim 5 except for the following points. Therefore, from the entire sentence of the description of the configuration of the invention of claim 5 described above, the following points are excluded and incorporated herein, and the following description of the configuration is added thereto. The difference is the presence of the capacitor cut direction as described above. These two cuts are in a direction orthogonal to the cuts of the electrodes facing each other.

The structure of the comb-shaped capacitor according to the present invention will be described. The shoplifting-preventing electric resonance tag using the comb-shaped capacitor and the comb-shaped capacitor according to the present invention are described below. The invention first has one electrode of a capacitor with a comb-shaped notch. Next is the other electrode of the capacitor. The other electrode of the capacitor is located at a position opposite to the one electrode of the capacitor and has a comb-shaped notch.

Finally, the structure of the invention of a shoplifting-preventing electric resonance tag using a comb-shaped capacitor according to the present invention will be described. . The present invention has the same configuration as the invention of claim 7 except for the following points. Therefore, from the whole sentence of the description of the configuration of the invention of claim 7 described above, the following points are excluded and incorporated herein, and the following description of the configuration is added thereto. The difference is the presence of the capacitor cut direction as described above. These two cuts are in a direction orthogonal to the cuts of the electrodes facing each other.

[0015]

The electrical resonance tag for preventing shoplifting and the comb-shaped capacitor using the comb-shaped capacitor according to the present invention have the following functions because of the above-described configurations. That is,
First, the action of the invention of the shoplifting-preventing electric resonance tag using the comb-shaped capacitor according to claim 1 of the present invention will be described. This is because the coil is provided on one surface of the above-mentioned electrical insulating film, one of the electrodes of each capacitor is provided at both ends of the coil, and the other of the electrodes of each capacitor is the electrode of each capacitor. Since it is provided on the other surface of the above-mentioned electrical insulating film at a position facing each one of
Acts as an electric resonance circuit. Since each electrode of these capacitors has a comb-shaped notch, the generation of an eddy current is prevented to the maximum extent. Finally, a capacitor coupling part connects the respective electrodes of the backside capacitors.

Next, the operation of the shoplifting-preventing electric resonance tag using the comb-shaped capacitor according to the present invention and the comb-shaped capacitor according to the present invention will be described. . The present invention is the same as the operation of the invention of claim 1 except for the following points. Therefore, the following points are excluded from the whole sentence of the explanation of the operation of the invention of claim 1 above, which is incorporated herein by reference, and the explanation of the following action is added thereto. The difference is the presence of the capacitor cut direction as described above. These two notches are
Since it is in the direction orthogonal to the notch of the electrodes facing each other, even if there is some positional displacement of the electrodes of these capacitors, the capacitance does not change so much.

The operation of the shoplifting-preventing electric resonance tag using the comb-shaped capacitor and the comb-shaped capacitor according to the present invention will be described. This invention is the same as the operation of the invention of claim 1 except for the following points. Therefore, from the whole sentence of the explanation of the operation of the invention of the above-mentioned claim 1, the following points are excluded from the whole sentence, and the following explanation of the operation is added thereto. The difference is the above-mentioned electrical conduction point in place of the above-mentioned one capacitor. This electrically conducting point directly electrically connects the other electrode of the capacitor and the other end of the coil.

The operation of the shoplifting-preventing electric resonance tag using the comb-shaped capacitor according to the present invention will be described. The present invention is the same as the operation of the invention of claim 2 except for the following points. Therefore, from the whole sentence of the explanation of the operation of the invention of claim 2 mentioned above, the following points are excluded from the whole sentence, and the following explanation of the operation is added thereto. The difference is the above-mentioned electrical conduction point in place of the above-mentioned one capacitor. This electrically conducting point directly electrically connects the other electrode of the capacitor and the other end of the coil.

The operation of the invention of the comb-shaped capacitor according to claim 5 of the electric resonance tag for shoplifting prevention and the comb-shaped capacitor using the comb-shaped capacitor according to the present invention will be described. First, one electrode of the capacitor is provided on one surface of the electric insulating film and has a comb-shaped notch, and the other electrode of the capacitor is one electrode of the above capacitor. Since it is provided on the other surface of the above-mentioned electric insulating film and has a notch of a comb shape, the generation of an eddy current is prevented to the maximum.

The operation of the invention of the comb-shaped capacitor according to claim 6 of the electric resonance tag for shoplifting prevention and the comb-shaped capacitor using the comb-shaped capacitor according to the present invention will be described. This invention is the same as the operation of the invention of claim 5 except for the following points. Therefore, the following points are excluded from the whole sentence of the explanation of the operation of the invention of the above-mentioned claim 5, and the following explanation of the action is added thereto. The difference is the presence of the capacitor cut direction as described above. These two cuts are in a direction orthogonal to the cuts of the electrodes facing each other.

The operation of the invention of the comb-shaped capacitor according to claim 7 of the electric resonance tag for preventing shoplifting and the comb-shaped capacitor using the comb-shaped capacitor according to the present invention will be described. The invention first has one electrode of a capacitor with a comb-shaped notch. Next is the other electrode of the capacitor. Since the other electrode of the capacitor is located at a position opposite to the one electrode of the capacitor and has a notch of a comb shape, eddy current is prevented from being generated to the maximum extent.

Finally, the operation of the invention of the shoplifting-preventing electric resonance tag using the comb-shaped capacitor according to the present invention will be described. . This invention is the same as the operation of the invention of claim 7 except for the following points. Therefore, the following points are excluded from the whole sentence of the explanation of the action of the invention of claim 7, and the following explanation of the action is added thereto. The difference is the presence of the capacitor cut direction as described above. Since these two cuts are in the direction orthogonal to the cuts of the electrodes facing each other, even if there is some positional displacement of the electrodes of those capacitors, the capacitance does not change so much.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An electrical resonance tag for preventing shoplifting and a comb-shaped capacitor using a comb-shaped capacitor according to the present invention will be described below in detail with reference to the accompanying drawings using each of those embodiments. First, the embodiments of claims 1 and 2 will be described. This is first
There is a film of dielectric 10. Next is the coil 20. The coil 20 is provided by etching an aluminum foil attached to one surface 10a of the dielectric film 10 described above. And the respective capacitors 31, 32
There is one electrode 31a, 32a of each of the above. The electrodes 31a and 32a of the capacitors 31 and 32 are provided by etching the aluminum foil attached to the one surface 10a of the dielectric film 1 at the same time as the coil 2 is formed. One of the electrodes 31a and 32a of the capacitors 31 and 32 is provided at both ends of the coil 10 and has a comb-shaped cut 33 (capacitor shown in FIG. 2). (See enlarged view of parts 31 and 32).

The comb-shaped notch 33 is shown in FIG.
All are fairly wide, but this was done intentionally to show that the part is a notch for explanation, and in fact, as shown in Fig. 1, literally "notch"
The width is small enough to prevent etching. Therefore, the capacity of the capacitor itself is such that it is hardly reduced by making this cut. Further, there are the other electrodes 31b and 32b of the capacitors 31 and 32, respectively. The other electrodes 31b and 32b of the capacitors 31 and 32, respectively.
Is an aluminum foil attached to the back surface 10b of the dielectric film 10 at a position facing the respective electrodes 31a and 32a of the respective capacitors 31 and 32 by etching. . And, there is a comb-shaped notch 33 here as well.

Finally, there is a capacitor coupling 34. This capacitor coupling section 34 is the same as the above-mentioned capacitors 31, 3
2 is to electrically connect the electrodes 31b and 32b on the back side of each of the two, and the aluminum foil attached to the back surface 10b of the dielectric film 10 is simultaneously provided with the electrodes 31b and 32b by etching. It is a thing. Note that the capacitors 31 and 32 in FIG. 2 are slightly different from those in FIG. 1, but the one in FIG. 2 is shown for clarifying the cut 33, and other details are not considered here.

Next, examples of claims 3 and 4 will be described. Although this is less advantageous than the embodiments of claims 1 and 2 described above, it is technically possible, so this is also described. This is one in which the above-mentioned good electrical conduction point is provided in place of the one capacitor described in the embodiments of claims 1 and 2 above. The electrical conduction point is a point at which the other side of the capacitor, that is, the electrode on the back surface side and the other end of the coil are directly electrically coupled. Therefore, the capacitor coupling section 34 described in the invention of claim 1 is not present here.

Then, the embodiments of claims 5 and 6 will be described. This is basically the same as the capacitor used in the embodiments of claims 1 and 2, but the capacitor is not limited to two pairs. Further, claim 7
And 8 examples will be described. This is basically the same as the embodiments of claims 5 and 6, but uses air as the dielectric.

In the specification of the present invention, the term "for shoplifting prevention" is used, but it is not necessarily limited to the purpose of use in shoplifting prevention, and is also used for other purposes at the same time. All are included if possible.

[0029]

As described above, the electrical resonance tag for shoplifting prevention and the comb-shaped capacitor using the comb-shaped capacitor of the present invention have the following great effects. That is, by forming fine slits on the capacitor surface to prevent eddy currents from being generated on the capacitor pole surface, the inventions of claims 1 and 2 do not reduce Q, but two capacitors (conduction process is unnecessary). It can be a resonance circuit. Particularly, since the invention of claim 2 is in the direction perpendicular to the notches of the electrodes that oppose each other, the notches of both capacitors can be dealt with greatly, and a large number of Senkaku points can be obtained. A stable and destructible label with no variations can be created.

The destructible label sensor electrically destroys its sensor function when the product is sold, and delivers the product to the customer with the label sensor (in a non-functioning state) attached to the product (conventionally, It was difficult to peel it off at the time of sales). Therefore, with this "destructive type" label sensor made by the present invention, the conventional destructive type label sensor has "dots" (artificially made weak portions) for destruction made on the capacitor surface in manufacturing. , Was a quality bottleneck. However, the invention of claim 2 of the present invention also solves this problem by utilizing the orthogonal points of the electrodes of the capacitor.

As described above, the label sensor of the present invention can be used as an ideal sensor for mass production by eliminating the disadvantages of the label sensor of the first generation and the label sensor of the second generation, by making use of the advantages of both. . What's more, it can be used as a destructible label sensor. However, due to the area of the capacitor, L is slightly smaller than that of the second-generation label sensor, so the sensing power is slightly lower than that of the second-generation label sensor (much better than the first-generation label sensor). This sensing power ratio (in the case of the same outer peripheral area) is about 130% for the second-generation label sensor when the first-generation label sensor is 100%.
Approximately 125% of the second generation label sensor (of the present invention)
Is.

Finally, the market capacitor of the present invention is
Since its eddy current prevention effect was confirmed, its specific application field will be widened.

[Brief description of drawings]

FIG. 1 is an embodiment of an electric resonance tag for shoplifting prevention using a comb-shaped capacitor according to the present invention, in which A is a plan view and B is a back view thereof.

2 is an enlarged view of the capacitor portion of FIG. 1, where A is its plan view and B is its rear view. FIG.

[Explanation of symbols]

 10 Dielectric Film 20 Coil 31, 32 Capacitor 31a, 32a Electrode 31b, 32b Electrode 33 Notch 34 Capacitor Coupling Section

Claims (8)

[Claims] 1. An electrically insulating film (including a dielectric film; the same applies hereinafter), a coil provided on one surface of the electrically insulating film, a comb-shaped one provided at both ends of the coil (for hair). One of the electrodes of each capacitor having a notch (comb-shaped, the same applies hereinafter) and a position provided on the back surface of the above-mentioned electric insulating film at a position facing each one of the electrodes of each capacitor. And a comb-shaped capacitor-connecting part that connects the other side of each of the electrodes of each capacitor having a comb-shaped notch and the respective electrodes of the capacitors on the back side described above. Preventing electric resonant tag and comb capacitor. 2. An electrically insulating film, a coil provided on one surface of the electrically insulating film, and one of electrodes of each capacitor provided at both ends of the coil and having a comb-shaped notch. , Each of which is provided on the back surface of the electric insulating film at a position facing one of the respective electrodes of the capacitors and has a comb-shaped cut in a direction orthogonal to the cut. An electric resonance tag for shoplifting prevention using a comb-shaped capacitor and a comb-shaped capacitor, each of which is composed of a capacitor coupling portion that connects each of the other electrodes of the capacitor to each electrode of the capacitor on the back surface side. 3. An electrically insulating film, a coil provided on one surface of the electrically insulating film, one electrode of a capacitor provided at one end of the coil and having a comb-shaped notch, and The other electrode of the capacitor, which is provided on the back surface of the electric insulating film at a position facing one electrode and has a notch of a comb shape, the other electrode and the other end of the coil. An electrical resonance tag for preventing shoplifting and a comb-shaped capacitor using a comb-shaped capacitor, characterized in that they are composed of an electrical conducting point that is directly electrically coupled to each other. 4. An electrically insulating film, a coil provided on one surface of the electrically insulating film, one electrode of a capacitor provided at one end of the coil and having a comb-shaped notch, and The other electrode of the capacitor, which is provided on the back surface of the electric insulating film at a position opposite to one electrode and has a comb-shaped cut in a direction orthogonal to the cut, the other electrode An electric resonance tag for preventing shoplifting and a comb-shaped capacitor using a comb-shaped capacitor, characterized in that the coil and the other end of the coil are directly electrically coupled to each other. 5. An electrically insulating film, one electrode of a capacitor provided on one surface of the electrically insulating film and having a notch of a comb shape, and a position facing one electrode of the capacitor. A comb-shaped capacitor, comprising the other electrode of a capacitor provided on the back surface of the above-mentioned electrical insulating film and having a comb-shaped notch. 6. An electrically insulating film, one electrode of a capacitor provided on one surface of the electrically insulating film and having a comb-shaped notch, and a position facing one electrode of the capacitor. A comb-shaped capacitor, comprising the other electrode of a capacitor provided on the back surface of the electrical insulating film and having a comb-shaped cut in a direction orthogonal to the cut. 7. One electrode of a capacitor having a comb-shaped notch, the other electrode of a capacitor provided at a position facing one electrode of the capacitor and having a comb-shaped notch, A comb-shaped capacitor characterized by being configured. 8. One electrode of a capacitor having a comb-shaped notch, a comb-shaped notch provided in a position opposed to one electrode of the capacitor and in a direction orthogonal to the notch. The other electrode of the capacitor,
A comb-shaped capacitor, which is characterized in that