JP3296658B2 - Resonance label - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resonance label provided with a resonance circuit for electromagnetic waves, and more particularly to a resonance label attached to a product or the like for the purpose of preventing theft.

[0002]

2. Description of the Related Art Hitherto, a resonance label for preventing theft is attached to a product for the purpose of preventing the product from being illegally or erroneously taken out of a retail store or the like. Such resonance labels have specific frequencies (resonance frequencies)
A resonance circuit that resonates with the electromagnetic wave is formed. Then, if the product to which the resonance label is attached is attempted to be illegally taken out of the store, the resonance circuit of the resonance label resonates with an electromagnetic wave having a frequency corresponding to the resonance frequency emitted at the outlet of the store or the like. The presence of the label is detected by a detection device such as a security system.

FIGS. 5 to 7 show a top view, a bottom view and a longitudinal sectional view of a conventional general resonance label, respectively. As shown in those figures, the conventional resonance label 10
In the case of No. 0, an induction coil 130 is formed on one surface (lower surface) 110b of the insulating carrier layer 110 so as to form a spiral with a certain line width and a certain line width. Further, in the conventional resonance label 100, the carrier layer 110
Is sandwiched between a pair of capacitor plates 121 and 123 to form a capacitor portion C101. The capacitor plate 123 on the other surface (upper surface) 110a side of the carrier layer 110 and the inner end of the induction coil 130 are Short-circuit part 1 consisting of a through-hole provided at the corner of 110
A resonance circuit is formed by being electrically connected at 50.

[0004]

SUMMARY OF THE INVENTION The above-described resonance label 1
00 is used by being attached to a detection target such as a product. Therefore, depending on the product or the like, the aesthetic appearance may be impaired, or a precautionary note or the like written on a package of the product or the like may be covered or concealed. 100 is preferably as small as possible. In addition, in view of application to various kinds of products and the like and disposable usage, it is desired to reduce the size of the resonance label and reduce the price of the resonance label provided by the reduction.

However, if the resonance label 100 is simply reduced in size, the effective area of the resonance label 100 (from the average area of the induction coil 130, the area of the capacitor portion C101 formed in the coil window 131 surrounded by the induction coil 130). ), The Q value indicating the sharpness of the resonance frequency characteristic of the circuit also decreases, and the signal strength becomes extremely weak.

Therefore, in order to reduce the size, it is necessary to take measures to further increase the signal strength of the resonance label, such as increasing the line width of the induction coil 130 or increasing the coil window. To increase the area of 131,
There is a method of increasing the size of the resonance label 100 or the like. However, any of these methods not only causes a significant increase in manufacturing cost, but also causes a decrease in signal strength and a disadvantage against size reduction.

Further, in order to form the short-circuit portion 150,
Not only does the manufacturing process of the resonance label 100 become complicated and the manufacturing cost becomes high, but also a resistance (contact resistance) is generated at a contact portion between the induction coil and the capacitor plate in the short-circuit portion 150, and resonance characteristics as designed are obtained. There is also a disadvantage that it cannot be obtained.

The present invention has been made in view of the above points, and has as its object to provide a resonance label capable of increasing the signal strength with a simple structure without increasing the size of the label.

It is another object of the present invention to provide a resonance label which can be reduced in size without deteriorating performance such as signal strength.

[0010]

According to a first aspect of the present invention, there is provided a resonance label including a resonance circuit including at least one spiral-shaped induction coil and at least one capacitor. In the resonance label, the line width of the induction coil is reduced continuously or intermittently from the outside to the inside of the coil , and the line of each coil winding part constituting the induction coil is formed.
Set the width according to the length of each coil winding part
So that the electric resistance of each coil winding is equal to each other.
It is characterized by the following .

According to the present invention, the line width of the induction coil may be different for each coil winding constituting the induction coil .
No.

Specifically, the induction coil is formed on one surface of the insulating carrier layer of the label, and the outer end and the inner side of the induction coil are formed as in the resonance label according to the third aspect. The ends are electrically connected to a first capacitor plate and a second capacitor plate, respectively, formed on one surface of the carrier layer, while the first
Electrically connecting a third capacitor plate and a fourth capacitor plate formed on the other surface of the carrier layer to each other with respect to the first capacitor plate and the second capacitor plate, respectively, A first condenser section is constituted by the condenser plate and the third condenser plate,
And the fourth condenser plate may constitute a second condenser section.

In this specification, the term "coil winding portion" means a portion corresponding to one turn of a coil wound several times.

[0014]

According to the resonance label of the first aspect, the line width of the induction coil is continuously or intermittently reduced from the outside to the inside of the coil. Since the line width becomes thicker in the coil winding portion, the resistance of the entire induction coil decreases, the Q value of the resonance circuit that is inversely proportional to the resistance increases, and the signal strength of the resonance label proportional to the Q value increases. Also, by gradually reducing the line width of the induction coil, compared to a case where the electric resistance is reduced by uniformly increasing the line width of the coil,
Since the value of the sum of the line widths decreases, the inductance of the induction coil increases efficiently, the Q value of the resonance circuit proportional to the inductance increases, and the signal strength of the resonance label proportional to the Q value increases.

Accordingly, a resonance label having the same size as the conventional one and having a stronger signal strength than the conventional one can be obtained, and a resonance label having a signal strength equal to or higher than the conventional one and smaller than the conventional one can be obtained. Is obtained.

[0016] Line width of each coil winding constituting the induction coil
Are set to widths corresponding to the lengths of the coil windings, respectively.
So that the electrical resistance of each coil winding is equal to each other.
As a result, the resistance of the entire induction coil is efficiently reduced.
Therefore, the area of the coil window surrounded by the induction coil is small.
Can form a condenser in the window
Or it may cause a decrease in Q value,
Effective area of the resonance label determined by the average area of
And the signal strength is reduced.
This can be avoided.

According to the resonance label of the second aspect, induction is provided.
The line width of the coil is changed for each coil winding
Therefore, other than the effects obtained by the invention described in claim 1,
In addition, it is easy to set the resistance value of each coil winding, etc.
The design of the oscillation circuit is facilitated.

According to the resonance label of the third aspect , since the resonance circuit is constituted by the induction coil, the first capacitor portion, and the second capacitor portion, the resonance label is provided on the front and back sides of the carrier layer as in the related art. Even if the induction coil and the capacitor plate are not in direct contact with each other to ensure electrical continuity, the resonance circuit works effectively for electromagnetic waves having the same frequency as the resonance frequency. This eliminates the need for a short-circuiting process, thereby simplifying the manufacturing process of the resonance label and significantly reducing the manufacturing cost. In addition, the contact resistance at the short-circuit portion, which has conventionally been a problem, is eliminated, and the resonance characteristics as designed can be obtained.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a resonance label according to the present invention will be described below with reference to FIGS. 1 to 3 show an example of a resonance label according to the present invention. FIG. 1 is a top view, FIG. 2 is a bottom view, and FIG. 3 is a longitudinal sectional view. FIG. 4 shows the frequency characteristics of the signal strength at the time of resonance of the resonance label.

As shown in FIGS. 1 to 3, the resonance label 1 has at least one (one in this example) induction coil 30 and at least one (two in this example) capacitor section C1, C2, and the line width of the induction coil 30 becomes thinner each time the coil 30 is turned from the outside to the inside of the coil 30. That is, in the case of the resonance label 1 shown in FIG.
Although the number of windings is not particularly limited, for example, it has a spiral pattern in which coil windings are wound four times. Then, assuming that the coil windings of the spiral pattern are 30A, 30B, 30C, and 30D in order from the outside to the inside, the coil winding 30A is the thickest, the coil winding 30B is the thickest, and the coil winding 30C is the thickest. Next thick, coil winding 3
0D is the thinnest.

Each of the coil winding portions 30A, 30B, 30C, 3
Although the line width of 0D is not particularly limited, in the present example, it is determined in proportion to the length of each of the coil windings 30A, 30B, 30C, 30D. Thereby, each coil winding part 3
The electrical resistance values of 0A, 30B, 30C, and 30D are all equal. That is, each coil winding part 30A, 30
In general, the electrical resistance values of B, 30C, and 30D increase as their wiring lengths increase. Therefore, by increasing the line width in proportion to the wiring length of each of the coil windings 30A, 30B, 30C, and 30D, an increase in resistance due to an increase in the wiring length and a decrease in resistance due to an increase in the line width are obtained. Are canceled out, and each coil winding part 30A, 30B, 30C,
The resistance value of 30D becomes constant.

Each of the coil winding portions 30A, 30B, 30
By determining the line widths of C and 30D in proportion to their wiring lengths, the coil winding portions 30A, 30B, 30C,
The resistance value of 30D and the like can be easily set, and the design of the resonance circuit becomes easy.

Needless to say, the induction coil 30
In the above winding pattern, the wiring length becomes longer as the coil winding portion is located further outside. Accordingly, as described above, the line width becomes larger in the outer coil winding portion.

Here, the induction coil 30 is formed on the upper surface 10a of the insulating carrier layer 10, and its outer end is electrically connected to a first capacitor plate constituting the first capacitor section C1. Connected, while the inner end is electrically connected to a second capacitor plate constituting a second capacitor section C2.

The third component constituting the first condenser section C1
, And a fourth capacitor plate 24 forming the second capacitor section C2,
A first capacitor plate 21 and a second capacitor plate 22 are provided on the lower surface 10b of the carrier layer 10, respectively.
Are formed opposite to each other. Then, the third condenser plate 23 and the fourth condenser plate 2
4 are electrically connected to each other by a bridging conductor 40.

The first condenser section C1 is arranged outside the coil window section 31 surrounded by the induction coil 30. On the other hand, the second capacitor portion C2 is disposed at substantially the center in the coil window portion 31 and apart from the innermost coil winding portion 30D, and flows through the induction coil 30 at the time of resonance. Care is taken to prevent the magnetic flux generated by the current from being obstructed by the second capacitor section C2. Those first condenser parts C
The combined capacitance of the first and second capacitor sections C2 is determined by the resonance frequency of the resonance circuit and the inductance of the induction coil 30.

The induction coil 30, the capacitor plates 21, 22, 23 and 24, and the bridging conductor 40 are all conductive and are not particularly limited, but are formed of, for example, aluminum foil. .

By the way, the resonance label 1 having the above-described configuration is used.
Is a method in which the presence of the resonance label 1 is detected by the security system when the resonance circuit resonates with an electromagnetic wave having a frequency corresponding to the resonance frequency, but the first capacitor portion C1 or the second capacitor portion In C2, a dielectric breakdown portion (not shown) that is easily broken down may be formed. In this way, when passing through the cashier, dielectric breakdown occurs due to high-energy electromagnetic waves generated by the cashier, and the resonance circuit of the resonance label 1 can be disabled. That is, the resonance circuit of the resonance label 1 can resonate with the electromagnetic wave generated at the exit of the store only for a product that is illegally taken out of the store without passing through the cashier, and the alarm of the security system can be sounded. .

The resonance label 1 configured as described above is manufactured, for example, as follows. First, an aluminum foil without a pattern is attached to the upper surface 10a and the lower surface 10b of the carrier layer 10 via an adhesive.
Then, a photoresist (photosensitive resin) is further applied to the adhered upper aluminum foil, and the patterns of the first capacitor plate 21, the second capacitor plate 22, and the induction coil 30 are transferred by photolithography technology and etched. Then, the pattern is formed on the aluminum foil. On the other hand, similarly, the pattern of the third capacitor plate 23, the fourth capacitor plate 24, and the bridge conductor 40 is formed on the lower aluminum foil by photolithography and etching. By the above procedure, the resonance label 1 is completed.

In the case where the above-mentioned dielectric breakdown portion is provided, for example, a small through hole is formed in a corresponding portion of the first capacitor portion C1 or the second capacitor portion C2 of the carrier layer 10 in advance, and the through hole is formed. In this case, the upper and lower aluminum foils of the carrier layer 10 may be bonded to each other with an insulating adhesive.

In the description of the above embodiment, the surface of the carrier layer 10 on which the induction coil 30 is provided is referred to as the upper surface 10a and the lower surface thereof is referred to as the lower surface 10b for convenience.
There is no need to strictly distinguish between the upper and lower parts.

Next, specific examples (specific examples) and comparative examples will be given to clarify features of the present invention. Needless to say, the present invention is not limited by the following specific examples.

First, each configuration of a specific example and a comparative example will be described.

In a specific example, in the resonance label 1 having the configuration shown in FIGS.
A coil having a square shape of × 40 mm and a number of turns of 7 was formed. Distance between adjacent coil windings (line spacing)
Was set to 0.5 mm. In addition, the line width of each turn of the coil winding part wound seven times is set to 1.
60mm, 1.48mm, 1.36mm, 1.24mm, 1.1
They were 2 mm, 1.00 mm and 0.88 mm. The value of the wire width of each coil winding is set in this way because the wiring length of each coil winding is approximately 160 mm, 148 mm, 1
Based on 36mm, 124mm, 112mm, 100mm, 088mm.

In the comparative example, the line width of each coil winding is set to 1.0.
The same configuration as in the above specific example was adopted except that the line spacing was set to 0 mm and the line interval was set to 0.5 mm.

With respect to the specific example and the comparative example of the above configuration, the frequency characteristics of the signal intensity at the time of resonance were examined. FIG. 4 shows the results. As can be seen from the figure, the specific example has a stronger signal intensity than the comparative example. And
Since the signal intensity is higher in the specific example, it is considered that the Q value is also larger than that in the comparative example.

The basis is considered as follows. That is, the electric resistance value of each coil winding portion is proportional to the wiring length and inversely proportional to the wiring width. Therefore, for the specific example and the comparative example, when the electric resistance of the other coil windings is standardized, for example, with the electric resistance of the sixth coil winding as the reference value 100, the electric resistance of each coil winding is obtained. Are 100 in the specific example, and 160, 148, 136, 1 in the comparative example in order from the outside.
24, 112, 100, and 88. Therefore, the standard value of the electric resistance of the entire induction coil (the sum of the standard values of the respective coil windings) is 700 in the specific example, but is 868 in the comparative example. As compared with the comparative example, the overall electric resistance value is smaller by about 20%, and the Q value and the signal strength of the circuit are also increased by about 20%.

In the above specific examples and comparative examples,
For convenience, the electric resistance value of each coil winding is standardized on the basis of the electric resistance value of the sixth winding, but it is needless to say that the electric resistance value of the coil windings other than the sixth winding may be standardized. .

Further, in the specific example, the line interval may be constant as in the comparative example. In that case, the minimum value of the range that the line interval can take is about 0.3 mm. The minimum value when the line interval is not constant is also about 0.3 mm.

According to the above-described embodiment, since the line width of the induction coil 30 is reduced with each turn from the outside to the inside of the coil 30, the outer coil winding portion having a longer wiring length is provided. As the line width becomes thicker as the
Of the resonance circuit becomes smaller, the Q value of the resonance circuit that is inversely proportional to the resistance increases, and the signal strength of the resonance label 1 that is proportional to the Q value also increases. In addition, in order to reduce the overall resistance of the induction coil, it is conceivable to make the line width of all coil windings uniformly thicker. Since the value of the sum of the widths decreases, the inductance of the induction coil 30 increases efficiently, the Q value of the resonance circuit proportional to the inductance increases, and the signal strength of the resonance label proportional to the Q value increases.

Therefore, it is possible to obtain the resonance label 1 having the same size as the conventional one and having a stronger signal strength than the conventional one, and having the same or stronger signal strength as the conventional one, and having the same strength as the conventional one. A small resonance label 1 can also be obtained.

Each of the coil winding portions 30A, 30B, 30
Since the electric resistances of C and 30D are equal to each other,
Since the overall resistance of the induction coil 30 is efficiently reduced, the area of the coil window 31 is reduced and the window 31
For example, it is impossible to form a capacitor (second capacitor portion C2) therein, the Q value is rather reduced, the effective area of the resonance label 1 is reduced, and the signal strength is reduced. Can be avoided.

Further, an induction coil 30, a first capacitor plate 21 and a second capacitor plate 22 are formed on an upper surface 10a of the carrier layer 10, and a third capacitor is formed on a lower surface 10b of the carrier layer 10. Since the plate 23 and the fourth capacitor plate 24 are formed, the upper and lower conductors sandwiching the carrier layer 10 do not need to be short-circuited to directly contact each other to secure electrical continuity. Can be simplified and the manufacturing cost can be significantly reduced. In addition, there is no contact resistance that may occur due to the contact between the upper and lower conductors, and a designed resonance characteristic is obtained.

In the above embodiment, the resonance circuit of the resonance label 1 is constituted by one induction coil 30 and two capacitor portions C1 and C2. However, the present invention is not limited to this. As long as the line width of one induction coil is reduced from the outside to the inside of the coil, the configuration of the resonance circuit is not limited, and for example, two or more induction coils may be provided, or the capacitor section may be provided. 1
One or three or more may be provided.

Further, in the above-described embodiment, the line width of the induction coil 30 is reduced with each turn from the outside of the coil 30 to the inside. It may be continuously thinned down to the part.

[0046]

Further, the induction coil 30, the first condenser plate 21 and the second condenser plate 2
2 may be formed integrally, or may be formed separately and integrated. Similarly, the third capacitor plate 23, the fourth capacitor plate 24, and the bridge conductor 40 may be integrated beforehand, or may be integrated later. Further, it goes without saying that the resonance label 1 may be manufactured by a method other than the above manufacturing procedure.

[0048]

According to the resonance label of the first aspect, the line width of the induction coil is made to decrease continuously or intermittently from the outside to the inside of the coil. Since the outer coil winding has a larger line width, the resistance of the entire induction coil becomes smaller, the Q value of the resonance circuit that is inversely proportional to the resistance increases, and the signal strength of the resonance label proportional to the Q value increases. Become. In addition, since the line width of the induction coil is gradually reduced, the sum of the line widths becomes smaller than when the electric resistance is reduced by uniformly increasing the line width of the coil. The inductance of the coil increases efficiently, the Q value of the resonance circuit proportional to the inductance increases, and the signal strength of the resonance label proportional to the Q value also increases.

Therefore, it is possible to obtain a resonance label having the same size as the conventional one and having a stronger signal intensity than the conventional one.
Further, it is possible to obtain a resonance label having a signal intensity equal to or higher than the conventional one and smaller than the conventional one.

The line width of each coil winding constituting the induction coil
Are set to widths corresponding to the lengths of the coil windings, respectively.
So that the electrical resistance of each coil winding is equal to each other.
As a result, the resistance of the entire induction coil is efficiently reduced.
Therefore, the area of the coil window surrounded by the induction coil is small.
Can form a condenser in the window
Or it may cause a decrease in Q value,
Effective area of the resonance label determined by the average area of
And the signal strength is reduced.
This can be avoided.

According to the resonance label of the second aspect, induction is provided.
The line width of the coil is changed for each coil winding
Therefore, in addition to the effects obtained by the invention of claim 1,
Easy to set the resistance value of each coil winding
And the design of the resonance circuit is facilitated.

According to the resonance label of the third aspect , since the resonance circuit is constituted by the induction coil, the first capacitor section and the second capacitor section, they are respectively provided on the front and back sides with the carrier layer interposed therebetween as in the conventional case. Even if the induction coil and the capacitor plate are not in direct contact with each other to ensure electrical continuity, the resonance circuit works effectively for electromagnetic waves having the same frequency as the resonance frequency. This eliminates the need for a short-circuiting process, thereby simplifying the manufacturing process of the resonance label and significantly reducing the manufacturing cost. In addition, the contact resistance at the short-circuit portion, which has conventionally been a problem, is eliminated, and the resonance characteristics as designed can be obtained.

[Brief description of the drawings]

FIG. 1 is a top view of an example of a resonance label according to the present invention.

FIG. 2 is a bottom view of an example of the resonance label according to the present invention.

FIGS. 3 and 4 show an example of a resonance label according to the present invention.
FIG. 3 is a vertical sectional view taken along line III-III of FIG.

FIG. 4 is a characteristic diagram showing frequency characteristics of signal strength at resonance for a resonance label according to the present invention and a resonance label having a constant line width of an induction coil.

FIG. 5 is a top view of a conventional resonance label.

FIG. 6 is a bottom view of a conventional resonance label.

FIG. 7 is a longitudinal sectional view of a conventional resonance label taken along line VII-VII of FIGS. 5 and 6;

[Explanation of symbols]

 C1 First condenser part C2 Second condenser part 1 Resonance label 10 Carrier layer 10a Upper surface (one surface) 10b Lower surface (other surface) 21 First condenser plate 22 Second condenser plate 23 Third condenser plate 24 Fourth condenser plate 30 Induction coil 30A, 30B, 30C, 30D Coil winding part

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Masanobu Konan 3-5-13 Kiyomidai, Kawachinagano-shi, Osaka (56) References JP-A-48-77695 (JP, A) Jpn. , U) Special table 59-501030 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G08B 13/24 G09F 3/00

Claims (3)

(57) [Claims] 1. A resonance label including a resonance circuit including at least one spiral-shaped induction coil and at least one capacitor, wherein the line width of the induction coil is increased from the outside to the inside of the coil. Continuously or intermittently tapering and said induction coil
The wire width of each coil winding constituting
Set the width according to the length of the winding, and
Characterized in that the resistances are made equal to each other.
Sounding label . 2. The resonance label according to claim 1, wherein the line width of the induction coil is different for each coil winding part constituting the induction coil. 3. An induction coil is formed on one surface of an insulating carrier layer of a label, and an outer end and an inner end of the induction coil are formed on one surface of the carrier layer, respectively. Electrically connected to the first capacitor plate and the second capacitor plate, while being formed on the other surface of the carrier layer opposite to the first capacitor plate and the second capacitor plate, respectively. The third condenser plate and the fourth condenser plate are electrically connected to each other, and the first condenser plate and the third condenser plate constitute a first condenser portion, and the second condenser plate and the fourth condenser plate are connected to each other. claim 1 or, characterized in that to constitute a second capacitor portion in the condenser plate and said fourth condenser plate 2. The resonance label according to 2 .