KR100242265B1 - Novel thrombin inhibitors having arylalkylsulfonyl group - Google Patents

Abstract

Even if the surface of the article for theft monitoring is formed of any material, the resonance frequency of the resonance circuit portion does not change.

The anti-theft tag 12 attached to the antitheft article 11 includes a resonant circuit portion 14 which resonates with radio waves of a specific frequency transmitted from the transmitting antenna. Between the attaching surface of the article 11 and the resonant circuit portion 14 is a soft magnetic layer 16 formed of a soft magnetic material. The soft magnetic material for forming the soft magnetic layer 16 is any one of an amorphous alloy, a permalloy, an electronic wrought iron, a silicon steel sheet, a sendast alloy, a Fe-Al alloy, or a soft magnetic ferrite. The soft magnetic layer 16 may be a composite of a flake of soft magnetic material and a plastic.

Description

Anti-theft Tag

The present invention relates to a tag for informing that an article to prevent theft is taken without permission.

Conventionally, as this kind of anti-theft tag, the resonant circuit part of the tag attached to the theft monitoring article has been resonated by the radio wave of a specific frequency from the radio wave transmitting device, and the tag has been separated from the theft monitoring article. The anti-theft tag is disclosed so that the separation detection means detects and controls the sound output means notified by the separation notification part in accordance with the detection output of the separation detection means (Japanese Patent Laid-Open No. 8-185584). In this antitheft tag, the resonant circuit portion is formed by forming a conductive metal foil of a predetermined shape by etching or the like on both surfaces of a thin film of a flexible dielectric. For example, on the thin film surface, an induction circuit portion formed in a spiral shape by a conductive metal foil and a surface side planar pattern of a condenser circuit portion continuous to the dielectric circuit portion are formed in the swirling center of the induction circuit portion. The separation detecting means is a removal detecting switch having an operation bar that protrudes on the attachment surface of the article of the tag, and the detection switch is electrically connected to a power source and a rich person. The circuit formed by the removal detecting switch, the power supply, and the rich is a separate notification unit, and the rich is a notification sound output means. When the tag is attached to the article, the operation bar is pushed by the article, and the removal detection switch is turned off. When the tag is removed from the article, the operation bar protrudes to turn on the removal detection switch.

In addition, a transmission antenna and a reception antenna are placed at a predetermined interval in the door of a store that sells the article for theft monitoring, and these antennas are electrically connected to the control unit. The control unit is configured to transmit the radio wave of the frequency resonating in the resonant circuit unit from the transmission antenna and to always check the signal level of the reception signal from the reception antenna. In addition, a speaker for generating an alarm is connected to the control output of the controller.

In the anti-theft tag configured as described above, if the article monitoring theft tries to pass between the transmitting and receiving antennas without being cleared, the resonant circuit part of the tag attached to the anti-theft article is transmitted from the transmitting antenna. Since the signal is resonant at, the reception antenna receives a modulated reception signal having a reception level. As a result, the control unit issues an alarm in the speaker and can check that the uncleaned product is taken out. Moreover, when the tag is removed from the article, the operation bar protrudes and the removal detection switch is turned on, so that it can ring silently and reliably monitor theft.

However, in the conventional anti-theft tag, when the tag is attached to an article formed of a conductive material such as aluminum or a ferromagnetic material such as steel sheet, the magnetic inductance of the resonant circuit portion is changed. In comparison with the case where the tag is attached to the article formed of the material, the resonant frequency of the resonant circuit portion changes, which is inappropriate as an anti-theft tag.

An object of the present invention is to provide an anti-theft tag that does not change the resonant frequency of the resonant circuit part even if the surface of the article for theft monitoring is made of any material or the resonant frequency is high.

Another object of the present invention is to provide an anti-theft tag that can reduce the loss resistance portion of the resonant circuit portion, that is, the Q value, even if the resonant frequency is high, and to narrow the width of the resonant frequency band of the resonant circuit portion to enable sharp resonance. To provide.

1 and 3 or 4, the invention according to claim 1 comprises a resonant circuit portion 14 which resonates with radio waves of a specific frequency transmitted by a transmission antenna attached to an article 11 for theft monitoring. It is an improvement of the anti-theft tag 12 or the reference numeral 32 provided with. The characteristic configuration is that the soft magnetic material 16 or 36 formed by the extending | stretching material between the attachment surface of the article 11 and the resonant circuit part 14 is retrofitted.

In the anti-theft tag according to claim 1, the resonant circuit portion 14 is attached to an article 11 whose surface is made of a conductive material such as aluminum or a ferromagnetic material such as steel sheet via a soft magnetic layer 16 or 36. When the resonant circuit portion 14 is shielded electronically from the article 11 by the soft magnetic layer 16 or 36, the magnetic inductance of the resonant circuit 14 is formed by an insulating material or a nonmagnetic material. It hardly changes from when attached to an article.

In the invention according to claim 2, in the invention according to claim 1, one or two or more slits 36c and 36d are formed in the soft magnetic layer 36, as shown in Figs.

In the anti-theft tag according to claim 2, the same function as the invention according to claim 1 and the overcurrent generated in the soft magnetic layer 36 is blocked by the slits 36c and 36d even when the resonance frequency is high. Therefore, the magnetic inductance of the resonant circuit 14 hardly changes as described above.

The invention according to claim 3 is characterized in that in the invention according to claim 1, the soft magnetic layer is a composite of a flake of a soft magnetic material and a full plastic.

In the anti-theft tag according to claim 3, even if the frequency of radio waves transmitted from the transmission antenna is high, the generation of overcurrent in the soft magnetic layer is suppressed, so that the magnetic inductance of the resonant circuit portion hardly changes.

In the invention according to claim 4, in the inventions according to claims 1 to 3, the soft magnetic material for forming the soft magnetic layer is, for example, amorphous alloys, permalloy, electron wrought iron, silicon steel sheets, sendast alloys, Fe-Al alloys or lead. It is characterized by any of the magnetic ferrites.

As an amorphous alloy, high permeability materials, such as cobalt type, iron type, and nickel, are used. Amorphous alloy contains 70 to 98 weight% of total Co, Fe, and Ni, and contains 2 to 30 weight% of B, Si, and P in total, and contains other Al, Mn, Zr, Nb, etc.

Specific examples of the cobalt-based alloy include an alloy consisting of 84% by weight of Co, 5.3% by weight of Fe, 8.5% by weight of Si, and 2.2% by weight of B-2.2% by weight of Co-84% by weight of Fe-3.3% by weight and B-. Alloy consisting of 1.3% by weight, P-9.8% by weight and A1-1.6% by weight, alloy consisting of 89% by weight of Co-5.3, Fe-5.3% by weight, Si-2.3% by weight and B-3.4% by weight, Co-81.9% by weight Alloy consisting of%, Fe-5.1% by weight, Si-10% by weight and B-3% by weight, alloy consisting of 80% by weight, Fe-10% by weight, Si-6% by weight and B-4% by weight, Alloys composed of Co-78.8 wt%, Fe-5.1 wt%, Si-6.1 wt%, B-4.7 wt% and Ni-5.3 wt%.

Specific examples of the iron alloy include an alloy composed of Fe-95.4 wt% and B-4.6 wt%.

Specific examples of the Ni-based alloy include an alloy made of Ni-94.5 wt% and P-5.5 wt%.

As permalloy, 78-permalloy, 45-permalloy, Hipernik, Monimax, Sinimax, Radiometal, 1040 Alloy, Mumetal, Cr-permalloy, Mo-permalloy, Supermalloy, Hardperm, 36-permalloy, Deltamax, square hysteresis permalloy, JIS PB 1 1 type and 2 types, JIS PC 1 type-3 types, JIS PD type 1 and 2 types, JIS PE type 1 and 2 types, etc. are used.

As the electronic soft iron, industrial pure iron, ammonite iron, Cioffi pure iron, low carbon steel sheet or the like is used.

As the silicon steel sheet, non-oriented silicon steel sheet, oriented silicon steel sheet and the like are used.

As the sendest and the Fe-Al alloy, an alpam arm, a hypermal, a sendast, a super sendest, and the like are used.

As the soft magnetic ferrite line, a low magnetic flux density Mn-Mg alloy, an Mn-Zn alloy, a Ni-Zn alloy, a high magnetic flux density Mn-Zn alloy, or the like is used.

In the anti-theft tag according to claim 4, when the soft magnetic material is used as the soft magnetic layer, the magnetic permeability is greater than 1000, the coercive force is less than 100 A / m, and the hysteresis damage is small. It is possible to reliably electromagnetically shield the resonant circuit portion in an article formed of a ferromagnetic material.

In the invention according to claim 5, as shown in Figs. 11 and 15, a flat shielding coil 76 having both ends shorted between the attachment surface of the article 11 and the resonant circuit portion 74 is retrofitted. It features.

In the anti-theft tag according to claim 5, when the surface is attached to an article 11 formed of a conductive material such as aluminum or a ferromagnetic material such as steel sheet, the resonant circuit portion 74 is attached to the article 11 via a shielding coil 76. When the circuit portion 74 resonates, a reverse dielectric current flows through the shielding coil 76. For this reason, the magnetic field on the surface of the article 11 is erased by the magnetic field issued by the dielectric current flowing through the shielding coil 76 among the magnetic fields issued by the resonance circuit section 74 resonating. As a result, since no overcurrent occurs on the surface of the article 11, the magnetic inductance of the resonant circuit portion 74 is almost unchanged from the case where the surface is attached to an article formed of an insulating material or a nonmagnetic material.

In the invention according to claim 6, in the invention according to claim 5, as shown in Figs. 11 and 12, the shielding coil 76 is equal to or the same as the size of the resonance coil 78 of the resonance circuit portion 74. It is characterized in that formed larger than the coil (78).

In the anti-theft tag according to claim 6, since the resonant coil 78 is completely shielded by the shielding coil 76, the overcurrent does not occur in the article 11 even when the resonant coil 78 resonates. The magnetic inductance of 74 is not affected at all by the article 11 and hardly changes.

In the invention according to claim 7, according to claim 5 or 6, as shown in Figs. 11 and 12 or 16 again, the laminate of the resonant circuit portion 74 and the chape coil 76 or 106 is When projecting from the upper or lower surface, each element wire 76a or each ring portion 106a to 106e of the shielding coil 76 or 106 is disposed so as to be located between each element wire 78a of the resonant coil 78. It is done.

In the antitheft tag according to claim 7, the distribution capacity between the resonant coil 78 and the shielding coil 76 or 106 is reduced, so that the overcurrent generated on the surface of the article 11 can be reduced. As a result, the loss resistance of the resonant circuit portion 74 can be reduced. That is, since the Q value can be made high, the width of the resonance frequency band of the resonance circuit portion 74 can be narrowed, and the resonance circuit portion 74 becomes sharp resonance. In addition, even if the resonance frequency is high, the loss resistance such as hysteresis damage of the resonance circuit portion 74 can be reduced, that is, the Q value can be increased in the same manner as described above.

The invention according to claim 8 is an invention according to any one of claims 5 to 7, wherein as shown in FIG. 11 again, a non-conductive material having a thickness of 5 mm or less between the shielding coil 76 and the resonant coil 78. In addition, the non-magnetic coil insulation layer 80 is characterized in that the retrofit.

In the antitheft tag according to claim 8, the distribution capacity between the resonant coil 78 and the shielding coil 76 can be reduced by the coil insulating layer 80. As a result, the overcurrent generated on the surface of the article 11 can be reduced more than the invention according to claim 7, so that the Q value can be made higher, and the resonance circuit portion 74 becomes a sharper resonance.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a sectional view taken along the line A-A of Fig. 2 showing an anti-theft tag of a first embodiment of the present invention.

2 is a cross-sectional view taken along the line B-B in FIG. 1.

Fig. 3 is a diagram showing a state in which an article attached with the tag passes between a transmitting antenna and a receiving antenna.

4 is a cross-sectional view taken along the line C-C in FIG. 5 showing a second embodiment of the present invention.

5 is a cross-sectional view taken along the line D-D of FIG. 4.

6 is a cross-sectional view taken along the line E-E of FIG. 4.

FIG. 7 is a cross-sectional view taken along the line F-F in FIG. 4. FIG.

Fig. 8 is a cross-sectional view corresponding to Fig. 6 showing Fig. 3 Embodiment of the present invention.

Fig. 9 is a sectional view corresponding to Fig. 6 showing Fig. 4 Embodiment of the present invention.

FIG. 10 is a cross-sectional view corresponding to FIG. 6 showing a fifth embodiment of the present invention. FIG.

FIG. 11 is a cross-sectional view taken along the line G-G of FIG. 11 showing a sixth embodiment of the present invention. FIG.

12 is a cross-sectional view taken along the line H-H in FIG. 11.

Fig. 13 is an exploded perspective view of the resonant circuit portion and shielding coil of the antitheft tag.

Fig. 14 is a process diagram showing the manufacturing method of the resonant circuit portion and the shielding coil.

Fig. 15 is a diagram showing the direction of a magnetic field generated when a current flows through a resonant coil by a current of a specific frequency from a transmission antenna and a dielectric current flows through the shielding coil by this current.

Fig. 16 is an exploded perspective view corresponding to Fig. 13 showing a seventh embodiment of the present invention.

＊ Description of symbols for main parts of the drawings ＊

11: goods, 12, 32, 72: tags,

13: transmission antenna, 14, 74: resonant circuit section,

16, 36, 46, 56, 66: soft magnetic material,

36c, 36d, 46c, 56c, 66c: slit,

76, 106: shielding coil, 76a: wire of the shielding coil,

80: coil insulation layer,

106a to 106e: ring portions of shielding coils.

Next, a first embodiment of the present invention will be described with reference to the drawings.

As shown in Figs. 1 to 3, the tag 12 attached to the anti-theft article 11 includes a resonant circuit portion 14 which resonates with radio waves of a specific frequency transmitted from the transmission antenna 13, The soft magnetic layer 16 is interposed between the attachment surface of the article 11 and the resonant circuit section 14. The article 11 is a beverage contained in the steel plate container 11a made of ferromagnetic material in this embodiment. Or cooking oil or candy. The resonant circuit portion 14 is formed of a base plate 17 made of an insulating material such as paper or a plastic thin plate, and has a substantially square swirl shape on one surface of the base plate 17 by a conductive material such as copper or aluminum. And a coil 19, which is attached to one side of the base plate 17 and is electrically connected to the coil 18, (Figs. 1 and 2). The capacitor 19 is constituted by a pair of electrode layers 19a bonded to each other via a dielectric layer (not shown). The coil portion 18 is formed by winding an insulated wire in a substantially square shape and attaching it to the base plate 17, or by forming a conductive material such as aluminum foil or copper foil laminated on the base plate 17. Unnecessary portions are removed by an etching method or a baling method to form a substantially square swirl.

In addition, the soft magnetic layer 16 is formed of any one of an amorphous alloy, a permalloy, an electro-wrought iron, a steel plate, a sendast alloy, a Fe-Al alloy, or a soft magnetic ferrite. The soft magnetic body 16 is formed in a flat plate shape having substantially the same area as the base plate 17, and one side of the base plate 17 on which the coil portion 18 and the condenser 19 are formed by the adhesive 21. Is bonded to. The soft magnetic layer 16 adhered to the base plate 17 is attached to the surface of the article 11, that is, the surface of the steel plate container 11a with the adhesive 22 therebetween (Figs. 1 to 3). ). The transmitting and receiving antennas 13 and 23 are spaced apart from each other at the entrance and exit of the store that sells the article 11 (Figure 3). The reception antenna 23 is connected to the control input of the control unit 24, and the transmission antenna 13 is connected to the control output of the control unit 24. In addition, a speaker 26 for generating an alarm is connected to the control output of the control unit 24.

The control unit 24 is configured to transmit the radio wave of the frequency resonating in the resonant circuit unit 14 from the transmission antenna 13 and to always check the signal level of the reception signal from the reception antenna 23. That is, the radio wave transmitted from the transmission antenna 13 is a resonant circuit portion of the tag 12, with the signal level when the reception antenna 23 receives the radio wave transmitted from the transmission antenna 13 as a reference value. When the receiving antenna 23 receives the resonance at 14, the signal level is increased by a predetermined value above the reference value, but the control unit 24 is configured to ring the speaker 26 at this time.

The operation of the anti-theft tag configured as described above will be described.

When the article 11 attached with the tag 12 passes through between the transmitting antenna 13 and the receiving antenna 23 in order to lift the article 11 from the store without permission, the radio wave transmitted from the transmitting antenna 13 is tagged. The resonance circuit portion 14 of (12) is given to cause resonance. At this time, since the resonant circuit portion 14 is electromagnetically shielded from the steel plate control vessel 11a of the article 11 by the soft magnetic layer 16, the magnetic inductance of the resonant circuit portion 14 hardly changes. As a result, propagation of a predetermined frequency is re-radiated in the resonant circuit portion 14 by the magnetic inductance of the coil portion 18 and the capacitance of the capacitor 19. When the receiving antenna 23 receives the re-radiated radio wave, the control unit 24 detects that the article 11 that has not been paid is lifted out according to the received signal, so that the speaker 26 rings. Alarm.

On the other hand, when a fee is paid regularly, strong radio waves are emitted to the tag 12 at an accounting place (not shown) to destroy the capacitor 19 of the resonant circuit portion 14. As a result, even if the article 11 passes between the transmitting antenna 13 and the receiving antenna 23, since the resonant circuit portion 14 does not resonate, the controller 24 does not ring the speaker 26. .

In this embodiment, although the drink contained in the steel plate container which is a ferromagnetic material, cooking oil, candy, etc. was mentioned as an article, even if the drink is contained in the aluminum container which is a conductive material, or an insulating material or a non-magnetic material is used. The article may be formed of a material or any other material. When the article is an object, the tag of the present invention can be attached to the sales card by an adhesive, and the book normally purchased is exerted between the transmitting and receiving antennas because the sales card is exhibited at the accounting place of the store. The speaker does not give an alarm even if it passes.

Moreover, in this embodiment, although the coil part was formed in substantially square vortex shape, you may form in a substantially circular super winding shape or other over winding shape.

In addition, in this embodiment, although the soft magnetic layer was affixed on the surface of an article via an adhesive agent, you may adhere to the surface of an article via the adhesive tape in which the adhesive agent was apply | coated on both surfaces.

In addition, the thickness of the soft magnetic layer is not particularly limited as long as the electron shielding effect is shown, but it is preferably in the range of 5 µm to 500 µm for practical use.

In addition, the soft magnetic layer can be formed of a composite of a flake of soft magnetic material and a full plastic. In this case, in order to prevent overcurrent from occurring during the flakes, it is preferable to form the flake thickness of the soft magnetic material to be 20 µm or less. Moreover, as a plastic, it is preferable to use the acrylic resin which has insulation, polyester, polyvinyl chloride, polyethylene, polystyrene, an epoxy, etc.

4 to 7 show a second embodiment of the present invention. In Figs. 4 to 7, the same reference numerals as Figs. 1 to 3 denote the same parts.

In this embodiment, the two first and second layers 36a in which the soft magnetic layer 36, which is interposed between the attachment surface of the article 11 and the resonant circuit portion 14, are laminated via the adhesive layer 20. Except for retaining 36b) (Figs. 4, 6, and 7), the configuration is substantially the same as in the first embodiment. The adhesive layer 20 is formed by applying an adhesive to both surfaces of the insulating film, and the first and second layers 36a and 36b are electrically insulated from each other by the adhesive layer 20. This is because overcurrent generated in the first layer 36a or the second layer 36b is prevented from flowing into the second layer 36b or the first layer 36a. A plurality of first slits 36c are formed in the first layer 36a at predetermined intervals in the longitudinal direction, except for portions having a predetermined width extending in the longitudinal direction at the center in the longitudinal direction (Fig. 6). In addition, a plurality of second slits 36d are formed in the second layer 36b at predetermined intervals in the horizontal direction, except for a portion having a predetermined width extending in the vertical direction at the center of the horizontal direction (Fig. 7).

These slits 36c and 36d are formed by an etching method, a baling method, an electron beam method, a laser cutting method, or the like. The first layer 36a and the second layer 36b are laminated so that the slits 36c and 36d are perpendicular to each other, so that the directions of the slits 36c and 36d are perpendicular to the direction of the coil portion 18. In the case where the overcurrent can be most efficiently prevented in the case, the generation of the overcurrent can hardly be prevented when the directions of the slits 36c and 36d are parallel to the direction of the coil portion 18. This is to alleviate the degree of the direction of the slits 36c and 36d even a little when overcurrent cannot be prevented.

Moreover, in order to prevent generation of overcurrent in one soft magnetic layer, it is preferable to form a slit radially, as shown in 4th Embodiment mentioned later and FIG.

Even when the widths of the slits 36c and 36d are narrowed, the voltage of the overcurrent generated in the layers 36a and 36b is minute, so that discharge does not occur in the slits 36c and 36d. In addition, when the widths of the slits 36c and 36d are increased, the volume of the soft magnetic layer 36 is reduced, and the effect of electron shielding by the soft magnetic layer 36 is reduced. For this reason, the width of the slits 36c and 36d should be as narrow as possible in terms of performance, but there are restrictions on the processing of the slits 36c and 36d. Therefore, in the case of the etching method, the width of the slits 36c and 36d is 0.05 mm to 1 mm, preferably 0.05 mm to 0.2 mm. In the case of the blasting method, the width of the slits 36c and 36d is 0.1 mm to 2 mm, preferably 0.1 mm to 0.2 mm. In the case of the electron induction method, the width of the slits 36c and 36d is 1 µm to 100 µm, preferably 1 µm to 100 µm. In addition, as the widths of the first and second layers 36a and 36b divided by the plurality of slits 36c and 36d become smaller, the overcurrent decreases, but the volume of the slits 36c and 36b decreases, respectively. The effect of electron shielding by the double layers 36a and 36b is reduced. Therefore, the number of slits 36c and 36d is 1 to 100 / cm, preferably 5 to 30 / cm.

The first and second layers 36a and 36b are each formed of a soft magnetic material which is any one of an amorphous alloy permalloy, an electronic wrought iron, a silicon steel sheet, a sendast alloy, a Fe-Alg alloy, or a soft magnetic ferrite. The first and second layers 36a and 34b bonded to each other, that is, the soft magnetic layer 36, are formed in a flat plate shape having substantially the same surface as the base plate 17, and the coil portion 18 is formed by the adhesive 21. And one side of the base plate 17 on which the capacitor 19 is formed. In addition, the soft magnetic layer 36 adhered to the base plate 17 is attached to the surface of the article 11, that is, the surface of the steel plate container 11a via the adhesive 22 (FIG. 4 and FIG. 5).

The operation of the anti-theft tag configured as described above will be described.

When the article 11 with the tag 32 attached is passed between the transmitting antenna (not shown) and the receiving antenna (not shown) in an unauthorized manner in a store, the transmission is performed in the same manner as in the first embodiment. The resonant circuit portion 14 of the tag is given a radio wave transmitted from the antenna to cause resonance. At this time, since the resonant circuit portion 14 is electromagnetically shielded from the container 11a made of the steel plate of the article 11 by the soft magnetic layer 36, the magnetic inductance of the resonant circuit portion 14 hardly changes. Further, even if the frequency of the radio wave transmitted from the transmission antenna is high, that is, the resonance frequency of the resonant circuit section 14 is high, the first and second orthogonal to each other in Figs. 1 and 2nd layer 36a and 36b are orthogonal to each other. Since the overcurrent generated so as to flow concentrically on the first and second layers 36a and 36b by the layers 36a and 36d can be prevented, the overcurrent can be prevented. The magnetic inductance of 14) hardly changes. As a result, the resonant circuit portion 14 radiates radio waves of a predetermined frequency by the magnetic inductance of the coil portion 18 and the capacitance of the capacitor 19. When the receiving antenna receives this re-radiated radio wave, the control section detects that the article 11 which has not been paid for is taken out without permission according to the received signal, thereby ringing a speaker (not shown) to give an alarm.

On the other hand, when a fee is paid regularly, the capacitor 19 of the resonance circuit unit 14 is destroyed by radiating strong radio waves to the tag 32 in the accounting place (not shown). Even if the article 11 passes, the resonant circuit portion 14 does not resonate, and the controller does not ring the speaker.

In this embodiment, two soft magnetic layers of the first and second layers are used, but three or more soft magnetic layers may be used. In this case, it is preferable that the slits of each soft magnetic layer are formed by pushing the slits by a predetermined angle.

8 shows a third embodiment of the present invention.

In this embodiment, the plurality of first slits 46e and the second slits (not shown) of the first layer 46a and the second layer (not shown) of the soft magnetic layer 46 are spaced at a predetermined interval and parallel to each other. In addition, it is comprised similarly to the said 2nd Embodiment except the 1st layer 46a and the 2nd layer which are formed so that each may be isolate | separated into a some single shape. Forming the first slit 46c and the second slit in the first layer 46a and the second layer is performed by etching after attaching the soft magnetic foil to the insulating film.

The operation of the tag for preventing theft configured as described above is substantially the same as that of the second embodiment, and therefore, repeated description is omitted.

9 shows a fourth embodiment of the present invention.

In this embodiment, a plurality of slits 5bc of the soft magnetic layer 56 are formed radially from the periphery of the slits 56e at the center of the soft magnetic layer 5b. The slit 56c is formed by an etching method, a baling method, an electron beam method, a laser cutting method, or the like.

In the tag for preventing theft thus formed, the number of slits 56c is limited to some extent, so that the effect of overcurrent prevention is inferior to that of the soft magnetic layer of the second embodiment, but the direction of the slits 56c is different. Since it is not constant and electrically directional, the overcurrent can be prevented even with one soft magnetic layer 5b, and the slits 56c need not be considered even when a plurality of soft magnetic layers 56 are used. Except for that, the operation is the same as that of the second embodiment, and thus the repetitive description is omitted.

10 shows a fifth embodiment of the present invention.

In this embodiment, the plurality of slits 66c of the soft magnetic layer 66 are formed of a long slit 66d formed radially around the centerless slit portion 66f of the soft magnetic layer 66, and the long slit ( The shot slit 66e formed radially about the slit part 66f is hold | maintained between 66d). The long slit 66d is a long slit formed around the soft magnetic layer 66 from the periphery of the muslit portion 66f as in the fourth embodiment, and the short slit 66e includes a plurality of long slits 66d. The outer end formed between the ends is a short slit that reaches the outer peripheral surface of the soft magnetic layer 66, and the inner end does not reach around the muslit portion 66f.

In the tag for preventing theft configured as described above, since the direction of the slit 66c is not constant and magnetically directional as in the fourth embodiment, eddy current can be prevented even in one soft magnetic layer 66. In addition, by forming the short slit 66e in a portion of the soft magnetic layer 66 in which the interval between the plurality of long slits 66d is widened, the interval between the portions can be narrowed, thereby preventing the occurrence of overcurrent. can do.

11 to 15 show a sixth embodiment of the present invention. 11 to 15, the same reference numerals as those in Figs. 1 to 3 denote the same parts.

In this embodiment, the tag 72 includes a resonant circuit portion 74 that resonates with radio waves of a specific frequency transmitted from the transmission antenna, a flat plate that is interposed between the attachment surface of the article 11 and the resonant circuit portion 74. A wound shield coil 76 is provided. The resonant circuit portion 74 includes a dielectric layer 77 formed of an insulating material such as paper or a plastic thin plate, a resonant coil 78 formed in a substantially square flat plate and a wound shape provided on the bottom surface of the dielectric layer 77, and a dielectric layer ( A first electrode layer 79a electrically connected to the resonant coil 78 provided on the lower surface of the 77 and a second electrode plate 79b provided on the upper surface of the dielectric layer 77 to face the first electrode layer 79a. (FIGS. 11-13). The capacitor 79 is formed of the first electrode layer 79a, the dielectric layer 77, and the second electrode layer 79b. In the dielectric layer 77, a through hole 77a (FIG. 13) is formed to face the inner end of the resonant coil 78, and a conductive line 79c having a front end facing the through hole 77a is formed in the second electrode layer 79b. 11 and 13 are connected. The resonance coil 78, the first electrode layer 79a, the second electrode layer 79b, and the conductive line 79c are formed of a conductive material such as aluminum or copper. When the resonant coil 78 and the first electrode layer 79a are laminated on the second electrode layer 79b and the conductive line 79c via the dielectric 77, the inner end of the resonant coil 78 opens the through hole 77a. It is comprised so that it may be electrically connected to the front-end | tip of the conductive wire 79c through it (FIG. 11).

The shielding coil 76 is formed in substantially square flat plate and wound shape by electroconductive materials, such as aluminum and copper (FIGS. 11-13). The shielding coil 76 is preferably formed larger than the resonance coil 78. In addition, when the resonant circuit portion 74 and the shielding coil 76 are laminated via the coil insulation layer 80 described later, and the laminate is projected from the upper or lower surface thereof, each element wire 76a of the shielding coil 76 is formed. ) Is preferably disposed so as to be positioned between each element wire 78a of the resonant coil 78 (Fig. 12). That is, the pitch of each element wire 76a of the shielding coil 76 is formed to be the same as the pitch of each element wire 78a of the resonance coil 78, and the element wires 76a of the outermost circumference of the shielding coil 7b It is preferable to form slightly larger than the outermost line 78a of the resonant coil 78. Forming the shielding coil 76 larger than the resonant coil 78 is to complete the electromagnetic shielding between the resonant coil 78 and the article 11 by the shielding coil 76, and the shielding coil 76 As described above, the element wires 76a of each of the?) Wires are separated from the element wires 78a of the resonance coil 78 to reduce the distribution capacity between the shield coil 76 and the resonance coil 78, and to reduce the Q value. It is for heightening.

A short circuit line 82 is provided on the lower surface of the shielding coil 76 via the short circuit insulating layer 81 (FIGS. 11 and 13). The short circuit insulating layer 81 is formed of an insulating material such as paper or a plastic thin plate, and the short circuit line 82 is formed of a conductive material such as aluminum or copper.

First and second perforations 81a and 81b (FIG. 13) are formed in the short circuit insulating layer 81 at positions opposite to the outer and inner ends of the shielding coil 76, and the short circuit lines 82 are provided at both ends thereof. It is formed by bending to face the first and second perforations 81a and 81b, respectively. When the shielding coil 76 is laminated on the shorting line 82 via the shorting insulating layer 81, the outer end and the inner end of the shielding coil 76 are electrically connected by the shorting line 82. That is, it is comprised so that a short may be carried out (FIG. 11).

The coil insulation layer 80 described above is refurbished between the shield coil 76 and the resonant coil 78 (Figs. 11 to 13). The coil insulation layer 80 is formed of a nonmagnetic, non-conductive paper or plastic sheet or the like, and the thickness thereof is 5 mm because there is a distribution capacity between the resonant coil 78 and the shielding coil 76. It is preferable to set it as follows, and it is more preferable to carry out in the range of 0.1 mm-1 mm. The coil insulation layer 80 is constituted as described above so that the loss resistance of the resonant circuit portion 74 is small, that is, the Q value is increased, and the magnetism of the resonant circuit portion 74 is shielded by the shielding coil 76. This is to suppress the reduction of inductance. In addition, the thicker the thickness of the coil face layer 80 is, the larger the effect of the Q value and the magnetic inductance becomes. However, if the thickness is made too thick, the tag 72 protrudes from the article 11 and is handled. This is because it is inconvenient and damages tacky. In addition, on the upper surfaces of the second electrode layer 79b and the conductive line 79c, a display panel 87 such as a price tag in which a price is indicated by a numerical value or a barcode is stacked (Fig. 11), and the display panel 87 and the base insulating layer 88 are It is formed of an insulating material such as paper or plastic foil.

In the doorway (not shown) of the shop which sells the said goods 11, similarly to 1st Embodiment, a transmission antenna (not shown) and a reception antenna (not shown) are set in the space | interval at predetermined intervals. The receiving antenna is connected to the control input of the control unit (not shown), and the transmitting antenna is connected to the control output of the control unit. In addition, a speaker (not shown) for generating an alarm is connected to the control output of the controller.

In this embodiment, the resonance coil and the shielding coil are formed in a substantially square flat plate and a wound shape, but may be formed in a rectangular, circular or other shape as long as the flat plate and the wound shape. When the tag is installed between a display plate such as a price tag and an article, a square slightly smaller than the display plate, or a square close to a square with a small difference between the long side and the short side is suitable.

In this embodiment, the shielding coil is formed larger than the resonant coil. However, if overcurrent does not occur in the article even when the resonant coil is resonated, and the magnetic inductance of the resonant circuit portion does not change, the shielding coil is formed to have the size of the resonance coil. You may form similarly.

An example of the manufacturing method of the anti-theft tag comprised in this way is shown.

A pair of conductive foils 91 and 92 formed of aluminum foil, copper foil, or the like are laminated on both sides of the coil insulation layer 80 (Fig. 14 (a)), and the conductive foil on the upper surface of the coil insulation layer 80 is formed. (91) is covered with a resistor film (93) of a shape corresponding to the resonant coil (78) and the first electrode layer (79a), and the conductive foil (92) of the lower surface of the coil insulation layer (80) is shielded coil (76). Coated with a resist film 94 having a shape corresponding to Fig. 14 (b). In this state, a caustic soda solution in the case of aluminum foil and a ferric chloride solution in the case of copper foil are used as the etching solution, and the resist coatings 93 and 94 of the pair of conductive foils 91 and 92 are used. After the uncoated portion is removed, the resist films 93 and 94 are peeled off (Fig. 14 (c)). By such an etching method, the resonance coil 78, the first electrode layer 79a, and the shielding coil 76 are formed on both surfaces of the insulating layer 80.

On the other hand, the second electrode layer 79b and the conductive line 79c are formed on the lower surface of the display panel 87 by etching, and the short circuit lines 82 are formed on the upper surface of the base insulating layer 88 by etching. . In addition, a through hole 77a (FIG. 13) is formed at a predetermined position of the dielectric layer 77, and the first and second perforations 81a and 82b (FIG. 13) at a predetermined position of the short insulating layer 81. After the formation, the adhesive (not shown) was applied to both surfaces of the dielectric layer 77 and the short circuit insulating layer 81.

Also, a coil insulating layer having a sign 87 having a second electrode layer 79b and a conductive line 79c, a dielectric layer 77, a resonant coil 78, a first electrode layer 79a, and a shielding coil 76 from above. (80), the short insulating layer 81, the base insulating layer 88 having the short circuit 82, and the adhesive layer 89 were stacked in this order and laminated and bonded together at a predetermined pressure (FIG. 11). When such a tag 72 is manufactured, the relative positional relationship between the resonant coil 78 and the shielding coil 76 can be set extremely accurately, and the resonance characteristic of the tag 72 is stabilized.

The resonant coil and the shielding coil may be formed into a flat plate and a wound shape by winding a conductive wire having an insulated surface, or may be formed into a flat plate and wound shape by blasting a conductive material such as aluminum foil or copper foil. Also good.

The operation of the anti-theft tag configured as described above will be described.

When an article 11 with a tag 72 is attached to an unauthorized store in the store and passes between a transmitting antenna (not shown) and a receiving antenna (not shown), the radio wave transmitted from the transmitting antenna is tagged. The resonance circuit portion 74 of 72 gives resonance, and an alternating current flows through the resonance coil 78. This current generates a resonant magnetic field, as shown by the solid arrow in Fig. 14, around the resonant coil 78, and the magnetic field causes a dielectric current in the opposite direction to the resonant coil 78 to the shielding coil 76. A shielding magnetic field such as a dashed arrow is generated around the shielding coil 76 by flow. Since the directions of the resonant magnetic field and the shielding magnetic field on the surface of the article 11 are opposite to each other, they are erased from each other so that overcurrent does not occur on the surface of the article, and the magnetic inductance of the resonant circuit portion 74 has an insulating material. It is almost unchanged from the case where it is attached to articles formed of nonmagnetic material. As a result, radio waves of a predetermined frequency are radiated from the resonant circuit portion 74 by the magnetic inductance of the resonant coil 78 and the capacitance of the capacitor 79. When the receiving antenna receives this re-radiated radio wave, the control unit (not shown) detects that the article 11 which does not pay a fee is taken out without permission according to the received signal, so that the speaker (not shown) sounds an alarm. Emits.

Also, even if the frequency of the radio wave transmitted from the transmission antenna is high, that is, even if the resonance frequency of the resonance circuit portion 74 is high, each element wire of the shielding coil 76 is projected when projecting from the upper or lower surface of the tag 72. 76a) is disposed so as to be located between each element wire 78a of the resonant coil 78, and a non-conductive, nonmagnetic coil insulating layer 80 having a predetermined thickness between the shielding coil 76 and the resonant coil 78. Since the refurbishment is repeated, the distribution capacity between the resonance coil 78 and the shielding coil 76 is reduced. As a result, the overcurrent generated on the surface of the article 11 can be further reduced, and the Q value can be increased, so that the width of the resonance frequency band of the resonance circuit portion 74 can be narrowed, and the resonance circuit portion 74 is sharp. It becomes resonance. Therefore, the resonant circuit portion 74 of the tag 72 resonates only by radio waves of a specific frequency transmitted from the transmitting antenna, and the resonant circuit portion 74 is transmitted by radio waves of a frequency slightly different from the frequency transmitted from other than the transmitting antenna. ) Does not resonate, and the speaker does not malfunction.

On the other hand, when a fee is paid regularly, a strong radio wave is radiated to the tag 72 by the counter, or heat is applied to destroy the capacitor 79 of the resonant circuit portion 74 and short circuit. As a result, even if the article 11 passes between the transmitting antenna and the receiving antenna, the resonant circuit portion 74 does not resonate.

When the shielding coil is used, the self-inductance of the resonant coil is reduced, but it operates at the same resonance frequency as when the shielding coil is not used by increasing the number of windings of the resonant coil or by increasing the capacity of the capacitor. You can do it.

16 shows a seventh embodiment of the present invention. In Fig. 16, the same reference numerals as those in Fig. 13 denote the same parts.

In this embodiment, the shielding coils 106 each have one winding number, and the first to fourth ring portions 106a to 106d having a square frame shape which are arranged in a plurality of concentric shapes by changing the length of the sides, and the ring portions thereof. It is comprised similarly to the said 6th Embodiment except having the square plate-shaped tetragonal ring part 106e provided in the center of 106a-106d. The quadrangular ring portion 106e is preferably disposed at the center of the resonant coil 78, and the first to fourth ring portions 106a to 106d are disposed to be located between the respective element wires 78a of the resonant coil 78. The inner ring portion 78e is regarded as a ring having a zero internal diameter, and the four corner portions of the square ring portion 106e function as shielding coils.

In the anti-theft tag configured as described above, since the shielding coil 106 is a ring in which the simple shape of the number of turns is one, respectively, the anti-theft tag can be manufactured by a simple etching as compared to the overwound shielding coil of the sixth embodiment. In addition, the ring part of the number of turns may be formed not square but rectangular, circular, or other shape, and the number of ring parts is not limited to the number of this embodiment.

(Example)

Next, the Example of this invention is described in detail with a comparative example.

Example 1

1 and 2 show that the base plate 17 of the resonant circuit portion 14 of the tag 12 attached to the article 11 is 40 sheets in length, width, and thickness, respectively, by paper made of an insulating material. The coil part formed in the plate shape of mm, 40 mm, and 0.1 mm, and wound around the base board 17 by winding nine times the insulation conductor of diameter 0.2mm in the substantially square overwound shape (volume shape). (18) is attached. The length of the outermost side of this coil part 18 was 30 mm, and the length of the innermost side was 10 mm. However, the capacitor | condenser 19 shown in FIG. 2 was not connected to the both ends of the coil part 18. As shown in FIG. This is because the resonant frequency of the resonant circuit portion 14 varies with the material of the article 11 because the magnetic inductance of the coil portion 18 changes, and the capacity of the capacitor 19 is the material of the article 11. This is because it does not change even if it changes. Moreover, the soft magnetic layer 16 was connected by interposing the coil part 18 in one surface of the base part 17. The soft magnetic layer 16 is formed of an alloy consisting of 80% by weight of Co, 10% by weight of Fe, 6% by weight of Si, and 4% by weight of B. The length, width, and thickness are 40 mm and 40 mm, respectively. And 25 mu m. This tag 12 was referred to as Example 1.

Example 2

Although not shown in the drawing, the soft magnetic layer was formed by the composite material of the flake of the cobalt-based amorphous alloy and the acrylic resin in the length, the width, and the thickness of 40 mm, 40 mm, and 0.6 mm, respectively. Only identically formed tags. The cobalt-based amorphous alloy was an alloy composed of 80% by weight of Co, 10% by weight of Fe, 6% by weight of Si, and 4% by weight of B, and had a thickness ranging from 5 μm to 50 μm. This tag was referred to as Example 2.

Example 3

Although not shown, the tag was formed in the same manner as in Example 1 except that the soft magnetic layer was formed by the permalloy in the length, width, and thickness of 40 mm, 40 mm, and 0.05 mm, respectively. The permalloy is one kind of JIS PC.

Example 4

As shown in FIGS. 4 to 7, the base plate 17 of the resonant circuit portion 14 of the tag 32 attached to the article 11 is 40 mm in length, width, and thickness, respectively, by paper made of an insulating material. , 40 mm and 0.1 mm in plate shape, and a coil portion 18 formed by winding an insulated wire having a diameter of 0.2 mm in an approximately square super winding shape on one side of the base plate 17 is attached. The length of the outermost side of this coil part 18 was 30 mm, and the length of the innermost side was 10 mm. However, the capacitor | condenser 19 shown in FIG. 5 was not connected to the both ends of the coil part 18 for the same reason as Example 1. FIG.

Moreover, the coil part 18 was pinched on one surface of the base plate 17, and the soft magnetic layer 36 was adhere | attached. The soft magnetic layer 36 is composed of four layers of a first layer 36a, a second layer 36b, a third layer (not shown), and a fourth layer (not shown), and the layers 36a and 36b. ) Is formed of an alloy consisting of 80% by weight of Co, 10% by weight of Fe, 6 weight percent of Si, and 4% by weight of B, 40 mm, 40 mm, and 25 μm, respectively. As shown in FIG. 3, a plurality of second slits 36d were formed in the first layer 36a by excluding a predetermined width extending in the horizontal direction at the center in the vertical direction. .

A third slit (not shown) identical to the first slit 36d is formed in the third layer, and a fourth slit (not shown) identical to the second slit 36d is formed in the fourth layer. The directions of the first to fourth slits 36c and 36d are different only, and the widths and spacings and the like are formed in the same manner. That is, the widths, lengths, and intervals of the slits 36c and 36d were 0.15 mm, 35 mm, and 0.85 mm, respectively, and the width of the portion where the center slit was not formed was 2 mm. Moreover, in the 1st layer 26a and the 4th layer, 78 slits 36d each were formed in total, respectively. These layers 36a and 36d were bonded to each other via the adhesive layer 20 having electrical insulation. This tag 32 was referred to as Example 4.

Example 5

As shown in Figs. 11 to 13, the coil insulating layer 80 of the tag 72 is made of non-conductive, non-magnetic paper, and has shapes of 40 mm, 40 mm, and 0.1 mm in length, width, and thickness, respectively. On the upper surface of the coil insulation layer 80, a resonant coil 78 formed by winding a conductive wire insulated with a 0.2 mm diameter surface in a substantially square flat plate and winding up nine times is attached. The length of the outermost side of the resonant coil 78 was 30 mm, and the length of the innermost side was 10 mm. However, the capacitor 79 shown in Figs. 11 to 13 was not connected to both ends of the resonance coil 78 for the same reason as in the first embodiment. Further, a shielding coil 76 formed by winding nine times in a substantially square flat plate and wound shape as described above was attached to the lower surface of the coil insulating layer 80, and both ends thereof were short-circuited by a disconnection line 82. A short insulating layer 81 is provided between the shielding coil 76 and the short circuit 82. In addition, the display panel 87, the base insulating layer 88, and the adhesive bond layer 89 shown in FIG. 11 were not laminated. The tag 72 constructed in this manner was referred to as the fifth embodiment.

Example 6

11-13, the tag 72 was produced on the conditions similar to Example 6 except having used the acryl plate of thickness 0.95mm as the coil insulation layer 80. As shown to FIG.

Example 7

Although not shown, a tag was formed in the same manner as in Example 4 except that slits were not formed in the first to fourth layers of the soft magnetic layer.

(Comparative Example 1)

Although not shown, a tag was formed in the same manner as in Example 1 except that the soft magnetic layer was not used.

(Comparative Example 2)

Although not shown, the tag was made in the same manner as in Example 5 except that the shielding coil was not used.

(Comparative Test 1 and Evaluation)

The tags of Examples 1-3 and Comparative Example 1 were placed on an acrylic plate (thickness 1 mm), an aluminum plate (thickness 1 mm) and a steel plate (thickness 1 mm), respectively, and the coil part of this tag was RF impedance and analyzer HP. The magnetic inductance of the coil part was measured by connecting to 4191A (made by Yokogawa Puret Fak Card Co., Ltd.). The results are shown in Table 1.

Measurement frequency (MHz) Magnetic inductance of the resonant circuit part when changing the material of the tag-attached material (μH) Magnification of the magnetic inductance of the resonant circuit part of the tag attached to each article Acrylic plate (AC) Aluminum plate (A1) Steel plate (Fe) A1 / AC Fe / AC Example 1 One 3.731 3.646 3.147 0.9772 0.8435 2 3.407 3.300 2.885 0.9686 0.8468 4 2.943 2.863 2.581 0.9728 0.8770 10 2.159 2.135 2.149 0.9889 0.9954 12 1.984 1.966 2.066 0.9909 1.0412 15 1.748 1.732 1.954 0.9903 1.118 20 1.366 1.340 1.731 0.9810 1.267 Example 2 One 4.126 4.003 4.074 0.9802 0.9874 2 4.095 3.965 4.028 0.9683 0.9836 4 4.114 3.990 4.044 0.9699 0.9830 10 4.695 4.635 4.687 0.9872 0.9983 12 5.124 5.140 5.188 1.0012 1.0102 15 6.200 6.380 6.420 1.0290 1.0355 20 10.16 8.440 8.100 0.8307 0.7972 Example 3 One 3.265 3.372 2.750 1.0329 0.8422 2 3.122 2.883 2.560 0.9239 0.8198 4 2.509 2.526 2.211 1.0068 0.8814 10 1.944 1.951 1.934 1.0036 0.9947 12 1.792 1.717 1.838 0.9579 1.0257 15 1.570 1.510 1.784 0.9761 1.1534 20 1.216 1.144 1.483 0.9408 1.2198 Comparative Example 1 One 2.439 0.5601 1.181 0.2296 0.4842 2 2.442 0.5356 0.985 0.1293 0.4034 4 2.454 0.5147 0.8361 0.2097 0.3401 10 2.640 0.4996 0.7070 0.1892 0.2678 12 2.754 0.5004 0.9621 0.1817 0.3493 15 2.998 0.5043 0.6807 0.1682 0.2271 20 3.717 0.5180 0.6806 0.1394 0.1831

As apparent from Table 1, when the tag of Comparative Example 1 is placed on an aluminum plate and a steel sheet, the magnetic inductance for each frequency of radio waves is smaller than that of the tag of Comparative Example 1 on an acrylic plate. Even if the tags of Examples 1-3 were placed on any of an acryl plate, an aluminum plate, and a steel plate, the magnetic inductance with respect to each frequency of a radio wave hardly changed. As a result, in the tags of Examples 1-3, it turned out that the well-known frequency with respect to each frequency of a radio wave becomes substantially constant even if the article which attaches this tag is formed from what kind of material.

(Comparative Test 2 and Evaluation)

The tags of Examples 4 and 7 were placed on an acrylic plate (thickness 1 mm), an aluminum plate (thickness 1 mm), and a steel plate (thickness 1 mm), respectively, and the coil part of the tag was RF impedance and analyzer HP 419A ( Yokohama Purette, Inc., manufactured by Bakgard Co., Ltd., the magnetic inductance L and Q values of the coil portion were measured at different frequencies. Here, the Q value is a value defined by ω L / r when each frequency is ω and the resistance of the certified circuit part is r. The higher the Q value is, the less loss due to overcurrent and the like. It is known that the width becomes sharp. The Q value is directly displayed on the RF impedance and analyzer. The results are shown in Table 2.

Measurement frequency (MHz) Magnetic inductance of the resonant circuit when the material of the surface of the article to be tagged is changed (μH) Q value of resonant circuit part when changing material of surface of tag Acrylic plate Aluminum plate Grater Acrylic plate Aluminum plate Grater Example 4 One 4.13 4.00 4.07 19.50 17.9 15.45 2 4.10 3.97 4.03 17/70 16.57 14.90 4 4.11 3.99 4.04 13.88 12.71 11.60 10 4.70 4.64 4.69 7.56 6.40 5.9 12 5.13 5.14 5.19 6.18 5.10 4.76 15 6.20 6.38 6.42 4.28 3.24 3.08 20 10.16 8.44 8.10 1.60 0.79 0.72 Example 7 One 3.97 3.75 3.36 4.71 4.92 4.55 2 3.43 3.40 3.04 3.43 3.50 3.60 4 2.94 2.93 2.66 2.41 2.45 2.77 10 2.16 2.18 2.16 1.43 1.45 1.79 12 1.99 2.01 2.06 1.25 1.27 1.59 15 1.76 1.78 1.92 1.03 1.03 1.32 20 1.30 1.37 1.67 0.72 0.71 0.92

As apparent from Table 2, even if the tags of Example 4 and Example 7 were placed on any of the acrylic plate, the aluminum plate and the steel sheet, the magnetic inductance for each frequency of radio wave was almost unchanged. The Q value of Example 4 was significantly larger than the Q value of Example 7. This indicates that the tag of the fourth embodiment has less loss due to overcurrent and the like than the tag of the seventh embodiment, and the resonance width is sharp.

(Comparative Test 3 and Evaluation)

The tags of Examples 5, 6 and Comparative Example 2 were placed on an acrylic plate (thickness 1 mm), an aluminum plate (thickness 1 mm), and a steel sheet (thickness 1 mm), respectively, and the resonant coil of this tag was RF impregnated. And an analyzer HP 4191A (Yokohama Purette, manufactured by Yokohama Co., Ltd.), and the frequencies were changed to measure the magnetic inductance L and Q values of the resonant coil. The results are shown in Table 3.

Measuring frequency Magnetic inductance of the resonant circuit part when the material of the surface of the article to which the tag is attached is changed (μH) Q value of resonant circuit part when changing material of surface of tag Acrylic plate Aluminum plate Grater Acrylic plate Aluminum plate Grater Example 5 10 1.36 1.33 1.35 17.5 16.9 14.7 12 1.36 1.33 1.35 21.0 20.3 17.7 15 1.36 1.33 1.35 26.2 25.3 22.1 20 1.31 133 1.35 34.9 33.8 29.5 Example 6 10 1.54 1.50 1.51 20.7 19.0 16.4 12 1.54 1.50 1.51 24.9 22.8 19.7 15 1.54 1.50 1.51 431.1 28.5 24.6 20 1.54 1.50 1.51 41.4 38.0 32.8 Comparative Example 2 10 2.64 0.35 0.82 71 6.96 1.80 12 2.76 0.35 0.78 75 8.10 1.79 15 3.01 0.35 0.75 70 7.40 1.76 20 3.77 0.34 0.72 49 7.10 1.67

As apparent from Table 3, when the tags of Comparative Example 2 were placed on an acrylic plate, an aluminium plate, or a steel sheet, respectively, Example 5 showed that the magnetic inductances of the resonant circuit part, that is, the resonant coils had different values. And even if the tag of Example 6 was placed on any of an acryl plate, an alumina plate, and a steel sheet, the magnetic inductance of the resonant coil was hardly changed.

When the tags of Examples 5 and 6 were placed on an acrylic plate, the Q value was lower than that of the tags of Comparative Example 2 on an acrylic plate, but the tags of Examples 5 and 6 were placed on an aluminum plate and a steel sheet. In the case, the tag of Comparative Example 2 became higher than the case of placing on the aluminum plate and the steel sheet. This is considered to be because the tags of Examples 5 and 6 have less loss resistance due to overcurrent and the like, and the width of the resonance is sharper than the tags of Comparative Example 2.

As described above, according to the present invention, an anti-theft tag attached to an anti-theft monitoring article has a resonant circuit portion resonating to radio waves of a specific frequency transmitted from a transmission antenna, and between the attachment surface of the article and the resonant circuit portion. Since the soft magnetic layer formed by the soft magnetic material was retrofitted, since the resonant circuit portion is shielded by the soft magnetic layer from the article formed from the conductive material or the ferromagnetic material, the magnetic inductance of the resonant circuit portion is hardly changed. That is, the resonant frequency of the resonant circuit portion attached to the article is approximately the same as when the surface is attached to the article formed of the insulating material or the nonmagnetic material.

In addition, when one or two or more slits are formed in the soft magnetic layer, the above-described effect is exhibited, and even if the resonance frequency is high, the magnetic inductance of the resonant circuit portion is almost unchanged as described above because the overcurrent generated in the soft magnetic layer is blocked.

In addition, if the soft magnetic layer is a composite material of a flake of soft magnetic material and full plastic, even if the frequency of radio waves transmitted from the transmitting antenna is high, the generation of overcurrent in the soft magnetic layer is suppressed, so that the magnetic inductance of the resonant circuit portion is reduced. Su is almost unchanged. In other words, the resonant frequency of the resonant circuit portion whose surface is attached to the article formed by the conductive material or the ferromagnetic material is almost the same as when the surface is attached to the article formed by the insulating material or nonmagnetic material.

In addition, if the soft magnetic material forming the soft magnetic layer is any one of an amorphous alloy, a permalloy, an electronic wrought iron, a silicon steel sheet, a sendast alloy, a Fe-Al alloy, or a soft magnetic ferrite, the soft magnetic material has a high permeability and coercive force. Because of this small and low hysteresis loss, it is possible to reliably electronically shield the resonant circuit portion from an article whose surface is formed of a conductive material or a ferromagnetic material.

In addition, when the shielding coil having a flat plate with both ends shorted between the attaching surface of the article and the resonant circuit portion, the resonant circuit portion resonates in a state where the surface of the article is formed of a conductive material such as aluminum or a ferromagnetic material. Even if the reverse direction of the dielectric current flows through the shielding coil, the magnetic field in the article is canceled by the magnetic field generated by the flow of the dielectric current through the shielding coil. As a result, since no overcurrent occurs on the surface of the article, the magnetic inductance of the resonant circuit portion is almost unchanged from the case where the surface is attached to an article formed of an insulating material or a nonmagnetic material.

If the resonant coil is formed to be equal to or larger than the size of the resonant coil in the resonant circuit section, the resonant coil is completely shielded from the article by the shielding coil, so that even if the resonant coil resonates, no overcurrent occurs in the article. The magnetic inductance of the resonant circuit portion is not affected by the article and hardly changes.

In addition, when projecting the laminate of the resonant circuit portion and the shielding coil from the upper or lower surface thereof, if each element wire or ring portion of the shielding coil is disposed between the element wires of the resonance coil, the distribution capacity between the resonance coil and the shielding coil is reduced. Therefore, the overcurrent generated on the surface of the article can be reduced. As a result, the loss resistance portion of the resonant circuit portion can be reduced. That is, since the Q value can be increased, the width of the resonant frequency band of the resonant circuit portion can be narrowed, and the resonant circuit portion becomes sharp resonance. In addition, even if the resonant frequency is high, the loss resistance such as hysteresis damage or the like in the resonant circuit portion can be reduced, that is, the Q value can be increased in the same manner as above.

In addition, if a non-conductive, nonmagnetic coil insulation layer having a thickness of 5 mm or less is provided between the shielding coil and the resonance coil, the coil insulation layer further reduces the distribution capacity between the resonance coil and the shielding coil. Can be. As a result, the overcurrent generated on the surface of the article can be further reduced, whereby the Q value becomes higher, and the high circuit portion becomes a sharper resonance.

Claims (8)

In the anti-theft tag (12) (23) showing the resonant circuit portion (14) resonating with the radio wave of a specific frequency transmitted from the transmission antenna (13) attached to the theft-monitoring article (11), Anti-theft tag, characterized in that the soft magnetic layer (16) (36) (46) (56) formed by a soft magnetic material between the attachment surface of the article (11) and the resonant circuit portion (14) is refurbished. . The anti-theft tag according to claim 1, wherein at least one slit (36c) (36d) (46c) (56c) is formed in the soft magnetic layer (36) (46) (56). The anti-theft tag according to claim 1, wherein the soft magnetic layer is a composite of a flake of soft magnetic material and a plastic. The soft magnetic material for forming a soft magnetic layer according to any one of claims 1 to 3, wherein the soft magnetic material is formed of an amorphous alloy, permalloy, electronic wrought iron, silicon steel sheet, sendast alloy, Fe-Al alloy, or soft magnetic ferrite. Anti-theft tag, characterized in that any one. In the anti-theft tag (72) having a resonant circuit portion (74) attached to an antitheft article (11) and resonating with radio waves of a specific frequency transmitted from the transmitting antenna (13), Anti-theft tag, characterized in that the shielding coil (76) (106) of the flat plate with both ends short-circuited between the attachment surface of the article (11) and the resonant circuit portion (74). 6. The anti-theft tag according to claim 5, wherein the shielding coil (76) is formed equal to the size of the resonant coil (78) of the resonant circuit portion (74) or larger than the resonant coil (78). The element wires 76a of the above-described shielding coils 76 according to claim 5 or 6, when the stacked body of the resonant circuit portion 74 and the shielding coils 76 and 106 is projected onto the upper or lower surface thereof. Or an anti-theft tag disposed so that each ring portion 106a to 106e is positioned between each element wire 78a of the resonant coil 78 described above. The non-conductive and nonmagnetic coil insulation layer 80 having a thickness of 5 mm or less is retrofitted between the shielding coil 76 and the resonant coil 78. Anti-theft tag, characterized in that.

Images