JP3491670B2 - Anti-theft tag and method of manufacturing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tag for notifying unauthorized removal of an article for monitoring theft and a method for manufacturing the tag.

[0002]

2. Description of the Related Art Conventionally, as this kind of anti-theft tag,
The resonance circuit section of the tag attached to the theft monitoring article resonates with a radio wave of a specific frequency from the radio wave transmission device, and the separation detection means detects whether the tag is separated from the theft monitoring article. A theft prevention tag is disclosed in which the separation notification unit controls the notification sound output unit based on the detection output of the separation detection unit (JP-A-8-18558).
4). In this anti-theft tag, the resonance circuit section is formed by forming conductive metal foils of a predetermined shape on both surfaces of a thin film of an insulating dielectric by etching or the like. For example, on the thin film surface,
A coil portion formed of a conductive metal foil in a spiral shape, and a surface side flat pattern of a capacitor continuous with the coil portion are formed in the spiral center portion of the coil portion.

A transmitting antenna and a receiving antenna are erected at predetermined intervals at the entrance of a store that sells the theft monitoring articles, and these antennas are electrically connected to a control unit. The control unit is configured to cause the transmission antenna to transmit a radio wave having a frequency that resonates in the resonance circuit unit, and to constantly check the signal level of the reception signal from the reception antenna. Further, a speaker for issuing an alarm is connected to the control output of the control unit.

In the anti-theft tag thus constructed, when an article whose theft is being monitored tries to pass between the transmitting antenna and the receiving antenna without being cleared, the radio wave transmitted from the transmitting antenna is used for the anti-theft. Since it resonates in the resonance circuit portion of the tag attached to the article, the reception signal whose reception level is modulated is received by the reception antenna. As a result, the control unit can issue an alarm from the speaker and prevent the uncollected products from being taken out. When the liquidation of the goods is completed,
A store clerk applies a strong electromagnetic wave to the tag to destroy the capacitor to prevent the tag from operating, or the alarm speaker is temporarily stopped so that the alarm cannot be issued.

[0005]

However, in the above-mentioned conventional anti-theft tag, since the center line of the spiral coil portion extends in the direction orthogonal to the mounting surface of the article, the radio wave transmitted from the resonant circuit portion is generated. Pass through the article. Therefore, if this tag is attached to an article whose surface is made of a conductive material such as aluminum or a ferromagnetic material such as a steel plate, all of the magnetic flux generated by the resonance circuit section passes through the article and the self-inductance of the coil section. Change, the resonance frequency of the resonance circuit changes and the Q value decreases compared to when the tag is attached to an article whose surface is made of an insulating material or a non-magnetic material, and it operates as an anti-theft tag. I was afraid not to do it. Here, the Q value is a numerical value defined by ωL / r where ω is the angular frequency and r is the resistance of the resonance circuit section. The higher the Q value, the less the loss due to eddy currents. It is known that the width of resonance becomes sharp.

Further, in the above-mentioned conventional anti-theft tag, if the article is extremely thin or has a large number of irregularities on the surface, the tag may not be attached to the article, and the capacitor or coil portion may not be attached. Since it is formed of an extremely thin conductive metal foil, the capacitor and the like may be damaged by a relatively small impact. Further, the above-mentioned conventional anti-theft tag may be removed from an article without permission or forcibly by a person who tries to steal, and it operates depending on the orientation of the tag when the article passes between the transmitting antenna and the receiving antenna. There were times when it didn't.

A first object of the present invention is to prevent the resonance frequency of the resonance circuit section from changing and to lower the Q value of the coil section, no matter what material is used for the surface of the theft monitoring article. The purpose is to provide an anti-theft tag that will not let you. A second object of the present invention is that even an article to which a tag cannot be attached can be attached, the capacitor is not damaged when the cover is molded, and the capacitor can be reliably operated even if it comes into contact with a conductor or a magnetic body. It is to provide a tag for use. A third object of the present invention is to provide a theft prevention tag which can prevent the tag from being removed from an article without permission or forcibly, can be operated regardless of the direction of the tag, and can be further miniaturized. A fourth object of the present invention is to prevent the capacitor or the winding from being damaged by the end of the winding during the tag manufacturing process by locking and fixing the end of the winding to the magnetic core member. Electrical connection with capacitors and windings,
That is, it is an object of the present invention to provide a method for manufacturing an anti-theft tag, in which the soldering work can be carried out very easily, and a device for the soldering work can have a simple structure.

[0008]

The invention according to claim 1 is
As shown in FIG. 1, a magnetic core member 11 made of a composite material of soft magnetic metal powder or flakes and plastic.
A winding wire 12 provided on the circumferential surface of the magnetic core member 11, and a winding wire 12 housed in a recess 11a formed in the magnetic core member 11.
Capacitor 13 electrically connected to the magnetic core member 11
A through hole 14 through which a flexible linear body for covering the coil 12 with the winding 12 and the capacitor 13 and suspending the article can be inserted.
The anti-theft tag is provided with a plastic cover 14 having a formed therein.

In the theft prevention tag according to the present invention, since the tag 10 is attached to the article through the flexible linear member, the magnetic core direction of the magnetic core member 11 of the tag 10 is the article. To change. On the other hand, the magnetic core member 11 and the winding 12
The electric wave re-radiated by the resonance circuit section 17 constituted by the capacitor 13 and the capacitor 13 re-radiates toward the magnetic core of the magnetic core member 11, but the direction of the electric wave changes with respect to the article. , It is not easily affected by the material of the surface of the article. Also, the shape of the article is extremely thin,
Even if the surface of the article has a large number of irregularities, the tag 10 can be attached to the article via the flexible linear body, and the capacitor 13 is housed in the recess 11a of the magnetic core member 11. The capacitor 13 is not damaged by the plastic that flows into the mold when forming the cover 14. Further, if a flexible wire having a high strength is used, the tag 10 cannot be removed from the article without a tool or without force, so that the article can be reliably prevented from being taken out without permission.

The invention according to claim 2 is the invention according to claim 1, which is non-magnetic along one surface of the magnetic core member 11 on which the winding wire 12 is applied as shown in FIG. And an electromagnetic shield plate 28 having conductivity is provided.
Is coated with the magnetic core member 11, the winding wire 12, and the capacitor 13 by the coating body 24. In the anti-theft tag described in claim 2, the magnetic core member 1 is used.
Since the coil portion 16 composed of 1 and the winding wire 12 is electromagnetically shielded from the surface of the article, it is possible to completely prevent a change in self-inductance and a decrease in Q value. It is particularly effective when the surface of the article is made of a ferromagnetic material. This is because when the electromagnetic shielding plate 28 is provided on the surface of the coil portion 16 facing the surface of the article made of a ferromagnetic material, the magnetic flux out of the magnetic core member 11 which is about to pass through the article is conductive. Since the electromagnetic shield plate 28 passes over the high electromagnetic shield plate 28, and the electromagnetic shield plate 28 has no hysteresis loss and eddy current is hardly generated, an article made of a ferromagnetic material does not affect the resonance circuit section 17. Is.

The invention according to claim 3 is the invention according to claim 2, further, as shown in FIG. 4, a through hole 34a is formed so as to penetrate through the electromagnetic shielding plate 38 together with the cover 34. Characterize. In the anti-theft tag according to the present invention, since the periphery of the through hole 34a is constituted by not only the plastic covering 34 but also the electromagnetic shielding plate 38 such as a high-strength aluminum plate, the tag 30 is Even if the flexible linear member is forcibly torn off, the peripheral edge of the through hole 34a is not damaged. The invention according to claim 4 is the invention according to any one of claims 1 to 3, characterized in that a through hole is further formed through the magnetic core member together with the covering body or the covering body and the electromagnetic shielding plate. To do. In the anti-theft tag according to claim 4, it is more difficult to remove the tag from the flexible linear body without permission or by force than the tags according to claims 1 to 3.

The invention according to claim 5 relates to claims 1 to 4.
The invention according to any one of the aspects, further comprising a plurality of magnetic core members 41, 41 having different magnetic core directions, as shown in FIGS. 5 to 8. In the anti-theft tag according to claim 5, a plurality of magnetic core members 4 having different magnetic core directions are used.
Since the tag 40 having 1, 41 is used, the magnetic core member 4
The probability that the magnetic cores 1 and 41 pass between the transmitting antenna and the receiving antenna in a state where the magnetic cores of the tags 41 are oriented in the direction in which the sensitivity of the tag 40 is lowered becomes extremely low. That is, when the article passes between the antennas, there is a high probability that the sensitivity of any one of the plurality of resonance circuit units 47, 47 becomes good.

The invention according to claim 6 is defined by claims 1 to 5.
In any one of the inventions, further, as shown in FIGS. 9 to 11, a concave portion 61a is formed on the surface of the magnetic core member 61 so as to extend in a substantially straight line, and the capacitor 63 forms the capacitor 6
The first and second band-shaped conductors 71 and 72 electrically connected to the first and second electrodes 63a and 63b of the third coil 3 are housed in the recess 61a, and the winding direction of the winding wire 62 is 6
1a is applied in a direction different from the longitudinal direction,
The strip-shaped conductors 71 and 72 are characterized in that the vicinity of both ends of the winding wire 62 is electrically connected, respectively. In the antitheft tag according to the sixth aspect, since the first and second strip-shaped conductors 71 and 72 accommodated in the recess 61a having a relatively large area are electrically connected to both ends of the winding wire 62, Electrical connection between the capacitor 63 and the winding 62, ie solder 7
3,74 attachment work can be performed very easily.

The invention according to claim 7 is, as shown in FIGS. 9 to 11, a flexible insulating sheet 68 extending in a substantially straight line.
The first and second strip-shaped conductors 71 and 72 are provided on the upper side with a predetermined gap 69.
To bond the dielectric layer 63 to the predetermined gap 69.
a step of electrically connecting the first and second electrodes 63a, 63b of the capacitor 63 to the first and second strip-shaped conductors 71, 72, respectively, so that c faces each other; and the magnetic core member 61 during the molding of the magnetic core member 61. A notch 61e for the start end and a notch 61f for the end are respectively formed on at least two corners of the magnetic core member 61, and the insulating sheet 68 is provided on at least one surface of the magnetic core member 61.
A step of forming a substantially straight concave portion 61a that can be accommodated together with 72, a step of accommodating and adhering the insulating sheet 68 together with the capacitor 63 and the first and second strip-shaped conductors 71, 72 in the concave portion 61a, and a notch 61e for starting end The winding wire 62 is engaged with the magnetic core member 61 by recessing the starting end of the winding wire 62 into the recess 61a.
Of winding the winding 62 in a direction different from the longitudinal direction and locking the end of the winding 62 to the terminating notch 61f;
The first and second strip-shaped conductors 7 near the start end and the end of
The method of manufacturing an anti-theft tag includes a step of electrically connecting to the anti-theft tag 1, 2, respectively. In the method for manufacturing a theft prevention tag according to the present invention, the start end of the winding wire 62 is locked to the starting end notch 61e, and the end of the winding wire 62 is locked to the terminating notch 61f. By being fixed to 61, the ends of the winding 62 do not float during the manufacturing process of the tag 60. Further, since the first and second strip-shaped conductors 71 and 72 intersect with the vicinity of the start end and the vicinity of the end of the winding wire 62, respectively, the capacitor 63 and the winding wire 62 can be manufactured by an extremely simple operation of soldering these intersections 73 and 74. The electrical connection of is completed. Further, the first and second strip-shaped conductors 71,
Since 72 is housed in the recess 61a and the start end and the end of the winding wire 62 are locked to the magnetic core member 61, their intersections are always at the same position of the magnetic core member 61.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a first embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2,
The anti-theft tag 10 is a magnetic core member 11 formed of a composite material of soft magnetic metal powder or flakes and plastic.
A winding 12 formed on the circumferential surface of the magnetic core member 11, a capacitor 13 housed in a recess 11a formed in the magnetic core member 11, a winding 12 of the magnetic core member 11, and a capacitor 1
3 and a plastic covering body 14 for covering. The capacitor 13 includes the first and second electrodes 13a, 13
b and a dielectric layer 13c sandwiched by these electrodes 13a, 13b, and the first and second electrodes 13a, 13
Both ends of the winding 12 are electrically connected to b by soldering or the like. Further, the cover 14 is formed with a through hole 14a through which a wire (not shown) which is a flexible linear body for suspending the tag 10 on an article (not shown) can be inserted. The coil portion 1 includes the magnetic core member 11 and the winding wire 12.
6, and the coil portion 16 and the capacitor 14 constitute a resonance circuit portion 17.

The magnetic core member 11 is formed in a rectangular shape, and the concave portion 11 is formed.
a is formed at the center of one side thereof. Positioning holes 11b that determine the position of the magnetic core member 11 when the cover 14 is injection-molded are formed in the respective corner portions of the magnetic core member 11.
The soft magnetic metal powder or the composite material of flake and plastic is used as the magnetic core member 11 because the frequency of the radio wave radiated from the transmitting antenna described later is several MHz to several tens MH.
This is because z and a high frequency cause an eddy current to be generated when the metal plate or the metal foil is used, resulting in deterioration of the characteristics. As the soft magnetic metal, it is preferable to use carbonyl iron powder or reduced iron powder that can easily obtain a fine powder. The reduced iron powder is obtained by reducing fine iron oxide at low temperature with hydrogen gas or the like. As the soft magnetic metal, flakes obtained by iron, permalloy, amorphous alloy and the like are atomized to form a powder of the soft magnetic metal, and then the powder of the soft magnetic metal is mechanically flattened. May be.

The atomizing method is a method of spraying a molten metal and quenching and refining it. Since the structure of the metal material is homogeneous and fine, the composition and structure of the metal material are improved,
The reliability of the refractory metal material can be improved. This atomizing method includes a water atomizing method, a gas atomizing method, a vacuum atomizing method, and the like. Further, since the particle size of the soft magnetic metal powder obtained by the atomizing method is rather coarse, it is necessary to mechanically flatten it by using a ball mill, an attritor or the like. In addition,
When the soft magnetic metal powder is mechanically flattened, strain occurs, and when the strain deteriorates the characteristics, it is necessary to anneal after flattening. Further, as the soft magnetic metal, flakes of an amorphous alloy obtained by spraying a molten metal of an amorphous alloy onto the surface of water-cooled copper and causing them to collide with each other may be used.

As a method for producing a composite material of soft magnetic metal and plastic, a mixture of powder or flakes of soft magnetic metal and powder of plastic such as nylon resin, polyethylene resin, acrylic resin, vinyl chloride resin, etc. is kneaded. The kneaded material is pelletized and then injection-molded to form a rectangular magnetic core member 11. In this case, when a soft magnetic metal is aligned by applying a magnetic field in the magnetic direction when forming the mixture into a predetermined shape, the characteristics as a tag are further improved. Alternatively, a mixture of soft magnetic metal powder or flakes and plastic powder may be formed into a plate shape by a roll and then cut into strips, compression molding, or casting in a mold. In any of the above methods, the characteristics are improved by applying a magnetic field to align the soft magnetic metal.

When the soft magnetic metal is a powder, its diameter is preferably in the range of 0.1 to 30 μm,
More preferably, it is in the range of 0.3 to 5 μm. If the soft magnetic metal is flake, its thickness is 0.1.
It is preferably in the range of 10 to 10 μm, and 0.3 to 5
More preferably, it is in the range of μm. If the diameter of the soft magnetic metal powder is smaller than the above range, the powder is likely to be oxidized, and if it is too large, the loss due to eddy current increases. The mixing ratio of the plastic and the soft magnetic metal is preferably 10 to 95% by weight of the soft magnetic metal, and 40 to 9
It is more preferably 0% by weight. The balance is plastic. If the soft magnetic metal content is less than the above range, the magnetic permeability is too low. If the soft magnetic metal content exceeds the above range, the soft magnetic metals come into direct contact with each other and the magnetic core member 11 becomes conductive, resulting in a large loss. is there.

As the winding wire 12, a conductive wire such as an ordinary insulation-coated copper wire may be wound around the magnetic core member 11, or a conductive wire formed by etching may be used. In this case, the coating 14
When forming, the winding wire 12 is fixed to the magnetic core member 11 as necessary so that the conducting wire is not displaced. Further, the winding wire 12 may be directly formed on the surface of the magnetic core member 11 by a printing method,
The surface of the magnetic core member 11 may be formed to a predetermined thickness by a plating method, or the surface of the magnetic core member 11 may be preliminarily wound.
Alternatively, a groove having the shape of 2 may be formed in advance, and the electroless plating method may be used to deposit a conductive material in the groove. As the capacitor 13, the concave portion 1 of the magnetic core member 11 is used.
It is preferable to use a chip capacitor that can be accommodated in 1a. A lead-type capacitor or the like may be used as long as it is a capacitor 13 that can be accommodated in the recess 11a of the magnetic core member 11. A display plate (not shown) may be attached to the surface of the cover 14, and the price (not shown) is displayed on the upper surface of the display plate by a numerical value or a bar code.

The cover 14 is formed by injection molding or extrusion filling of plastic, and the plastic forming the cover 14 preferably has a lower melting point (softening point) than the plastic of the magnetic core member 11, such as ABS and polypropylene. It is preferable to use plastics such as epoxy resin. If the covering 11 can be molded in a short time,
The same plastic as the melting point (softening point) of the plastic of the magnetic core member 11 may be used. Although not shown, the wire is formed of a high-strength steel wire or the like, and connecting portions that are detachably connected to each other are fixed to both ends of the wire.
The wire is formed into a ring shape when these connecting portions are connected to each other, and the wire is formed into a linear shape when the connecting portion is removed using a predetermined tool.

Although not shown, a theft monitoring device is installed at the entrance of a store that sells goods. This device includes a transmission antenna and a reception antenna which are vertically arranged at a predetermined distance from each other, and a control unit in which a reception antenna is connected to a control input and the transmission antenna and a speaker are connected to a control output. The control section is configured to cause the transmitting antenna to transmit a radio wave having a frequency that resonates in the resonance circuit section 17, and to constantly check the signal level of the received signal from the receiving antenna. That is, when the signal level when the radio wave transmitted from the transmission antenna is directly received by the reception antenna is used as a reference value, and the radio wave transmitted from the transmission antenna resonates in the resonance circuit unit 17 of the tag 10 and is received by the reception antenna, The signal level becomes higher than the reference value by a predetermined value, but at this time, the control unit is configured to cause the speaker to ring.

The operation of the anti-theft tag thus configured will be described. When the tag 10 passes between the transmitting antenna and the receiving antenna in an attempt to take out the article attached via the wire without permission from the store, the resonance circuit section 17 of the tag 10 picks up a radio wave of a specific frequency transmitted from the transmitting antenna. Resonance is caused, and an alternating current flows through the resonance circuit section 17, so that the resonance circuit section 17 re-radiates a radio wave having a frequency predetermined by the self-inductance of the coil section 16 and the capacitance of the capacitor 13. At this time, the resonance circuit unit 1
Although the radio wave re-radiated by 7 is directed in the magnetic core direction of the magnetic core member 11, since the tag 10 is attached to the article via the wire, the direction of the tag 10 with respect to the article is not constant but changes. As a result, even if the surface of the article is formed of a conductive material or a ferromagnetic material, almost no eddy current is generated on the surface of the article, and the re-radiated radio waves are Not easily affected.

Therefore, no matter what material the surface of the article is, the change in the self-inductance of the coil portion 16 is small, and therefore the change in the resonance frequency of the resonance circuit portion 17 is small and the Q value of the coil portion 16 is small. Since the decrease is small, the resonance width of the resonance frequency is sharp, and the resonance characteristics of the tag 10 can be improved. Therefore, the re-radiated radio wave is reliably received by the receiving antenna. Based on the received signal, the control unit detects that the article for which the fee has not been paid is taken out without permission, and thus the speaker is sounded to issue an alarm. On the other hand, when the fee has been paid legally, the clerk at a checkout place (not shown) uses a predetermined tool to remove the connecting portion and linearly forms the ring-shaped wire to remove the tag 10 from the article. As a result, since the article without the tag 10 passes between the transmitting antenna and the receiving antenna, the control unit does not cause the speaker to ring.

Further, even if the shape of the article is extremely thin or the surface of the article has many irregularities,
The tag 10 can be attached to the article via a wire. Further, the capacitor 13 is the recess 11a of the magnetic core member 11.
Since it is housed in the capacitor, the plastic which flows into the mold when forming the cover 14 does not damage the capacitor 13. If a chip capacitor is used as the capacitor 13, the resonant circuit section 17 having excellent electrical characteristics can be obtained. If a wire having a higher strength is used, the tag 10 cannot be removed from the article without a tool or without force, so that the article can be reliably prevented from being taken out without permission.

FIG. 3 shows a second embodiment of the present invention.
3, the same reference numerals as those in FIG. 1 indicate the same parts. In this embodiment, a nonmagnetic and electrically conductive electromagnetic shield plate 28 is provided along one surface of the magnetic core member 11 on which the winding 12 is applied, and the electromagnetic shield plate 28 is the magnetic core member. 1
1, the winding 12 and the capacitor 13 together with the covering 24
Is covered by. The electromagnetic shield plate 28 is preferably formed of an aluminum plate, an aluminum alloy plate, or the like. Further, reference numeral 24a is a through hole. The configuration other than the above is the same as that of the first embodiment. In the antitheft tag 20 configured in this manner, the coil portion 16 including the magnetic core member 11 and the winding 12 is electromagnetically shielded from the surface of the article.
A change in self-inductance and a decrease in Q value can be completely prevented. It is particularly effective when the surface of the article is made of a ferromagnetic material. This is because when the electromagnetic shielding plate 28 is provided on the surface of the coil portion 16 facing the surface of the article made of a ferromagnetic material, the magnetic flux out of the magnetic core member 11 which is about to pass through the article is conductive. Since the electromagnetic shield plate 28 passes over the high electromagnetic shield plate 28, and the electromagnetic shield plate 28 has no hysteresis loss and eddy current is hardly generated, an article made of a ferromagnetic material does not affect the resonance circuit section 17. Is. Although the Q value decreases less as the thickness of the electromagnetic shield plate 28 increases, the thickness of the electromagnetic shield plate 28 of about 10 μm is sufficient for practical use.

FIG. 4 shows a third embodiment of the present invention.
4, the same reference numerals as those in FIG. 1 indicate the same parts. In this embodiment, the electromagnetic shield plate 38 is formed larger than the magnetic core member 11, and the through hole 34 a is formed so as to penetrate the electromagnetic shield plate 38 together with the covering body 34. In this case, the electromagnetic shield 3
No. 8 requires mechanical strength, so its thickness is about 1 mm.
It is preferable to form the film to a relatively large thickness. Second except the above
The configuration is the same as that of the above embodiment. In the antitheft tag 30 configured in this manner, the periphery of the through hole 34a is configured not only by the plastic covering 34 but also by the electromagnetic shielding plate 38 such as a high-strength aluminum plate.
Even if you try to force 0 from the wire, the through hole 3
The peripheral edge of 4a is not damaged. As a result, it is possible to remove the tag 30 from the wire without permission or by force.
It becomes more difficult than the above embodiment.

In the first and second embodiments described above, the through hole is formed only in the cover, but the magnetic core member is formed large so that the through hole penetrates not only the cover but also the magnetic core member. You may form it. In this case, the strength of the peripheral edge of the tag is improved as compared with the first and second embodiments. Further, in the third embodiment described above, the through hole is formed so as to penetrate the cover and the electromagnetic shielding plate, but the magnetic core member is formed large similarly to the electromagnetic shielding plate of the third embodiment, and the through hole is formed. The holes may be formed not only through the cover and the electromagnetic shield but also through the magnetic core member. in this case,
The strength of the periphery of the tag is further improved as compared with the third embodiment.

5 and 6 show a fourth embodiment of the present invention. In this embodiment, the tag 40 has two resonance circuit parts 47, 47, that is, the tag 40 has two magnetic core members 41, 41 having different magnetic core directions. Each magnetic core member 4
1, 41 are formed in a rectangular plate shape, and each magnetic core member 41,
They are arranged side by side on the same plane so that the longitudinal directions of 41 are orthogonal to each other. Windings 42, 42 are provided on the circumferential surfaces of the magnetic core members 41, 41 so that the magnetic core direction coincides with the longitudinal direction of the magnetic core members 41, 41.
Both ends of the first electrodes 43a, 4 of the capacitors 43, 43 housed in the recesses 41a, 41a of the magnetic core members 41, 41, respectively.
3a and the second electrodes 43b and 43b are electrically connected, respectively.

The anti-theft tag 40 having the above structure
The operation of will be described. When the article passes between the antennas with the magnetic cores of the magnetic core members 41, 41 oriented in the direction of the line connecting the transmitting antenna and the receiving antenna, the coil portion 4
6 and 46 have a large self-inductance and a large Q value, and the sensitivity of the tag is good, but when the magnetic core direction of the magnetic core members 41, 41 is in a plane orthogonal to the line connecting the transmitting antenna and the receiving antenna, the articles are When passing through, the sensitivity decreases. Therefore, as in this embodiment, the tag 40 having the two magnetic core members 41, 41 whose magnetic core directions are orthogonal to each other.
Is used, the magnetic core direction of the magnetic core members 41, 41 is the tag 40.
The probability of passing between the antennas in a state where the sensitivity of the antenna is lowered becomes extremely low. That is, when the article passes between the antennas, the probability that one of the two resonance circuit sections 47, 47 has a good sensitivity is high, so that the article can be almost certainly taken out without permission. It can be prevented.

7 and 8 show a fifth embodiment of the present invention. 7 and 8, the same reference numerals as those in FIGS. 5 and 6 indicate the same parts. In this embodiment, the two magnetic core members 41, 41 are arranged so as to be overlapped at a predetermined interval in the thickness direction and to be orthogonal to each other in the longitudinal direction, and the fourth embodiment described above. Configured the same as. Reference numeral 54a is a through hole formed in the cover 54. In the anti-theft tag 50 configured in this way, the cover 54 is thicker than the cover of the fourth embodiment, except that the area is smaller than that of the fourth embodiment. Since the operation is substantially the same as that of the tag, repeated description is omitted.

9 to 11 show a sixth embodiment of the present invention. In this embodiment, the recess 61a is formed by the magnetic core member 6
1 is formed on one surface of the capacitor 1 so as to extend in a substantially straight line (FIGS. 9 and 10), and the capacitor 63 has first and second electrodes electrically connected to the first and second electrodes 63a and 63b of the capacitor 63, respectively. The recess 6 together with the two strip conductors 71, 72
It is housed in 1a. The magnetic core member 61 is formed in a rectangular plate shape, and the recess 61 a is formed on one surface of the magnetic core member 61 and extends in the longitudinal direction at the center in the width direction. In addition, the recess 61
As shown in detail in FIG. 9, a is a deep-concentration capacitor housing portion 61b formed at the center in the longitudinal direction thereof, and a pair of inclined portions 61c that are connected to the capacitor housing portion 61b and gradually become shallower toward the ends. , 61c, and a pair of shallow bottom portions 61d, 61d that are connected to these inclined portions 61c, 61c and have an extremely shallow depth.

The capacitor 63 is a chip capacitor, and is bonded to the flexible insulating sheet 68 together with the first and second strip conductors 71 and 72. Insulation sheet 68
The width and length of the concave portion 61a are formed to be substantially the same as the width and length of the concave portion 61a. The first strip-shaped conductor 71 extends from the center of the insulating sheet 68 toward one end, and the second strip-shaped conductor 72 extends from the center of the insulating sheet 68 toward the other end with a predetermined gap 69 from the first strip-shaped conductor 71. Provided (FIGS. 9 and 1)
1). The capacitor 63 is placed so that the dielectric layer 63c faces the predetermined gap 69 between the first and second strip-shaped conductors 71 and 72, and the first and second electrodes 63a and 63b have the first and second strips. The conductors 71 and 72 are electrically connected to each other by soldering or the like. The winding wire 62 is wound in a direction different from the longitudinal direction of the recess 61a, that is, in the winding direction substantially orthogonal to the longitudinal direction of the recess 61a.
The first and second strip-shaped conductors 71, 7 are provided near both ends of the winding wire 62.
2 are electrically connected to each other by soldering or the like (FIG. 10). Reference numeral 61g in FIG. 10 is a positioning hole for positioning the magnetic core member 61 when the cover 64 is injection molded.

The anti-theft tag 60 constructed in this way
The manufacturing method of will be described. First, the first and second strip-shaped conductors 71 and 72 are adhered to the flexible insulating sheet 68 extending in a straight line with a predetermined gap 69, and then the capacitor 63 is placed on the first and second strip-shaped conductors 71 and 72. To the above predetermined gap 6
Then, the first and second electrodes 63a and 63b of the capacitor 63 are soldered to the first and second strip-shaped conductors 71 and 72. Also, the first and second strip conductors 71, 72
May be formed by etching an insulating sheet and a conductive foil attached on the entire surface. On the other hand, kneading a mixture of soft magnetic metal powder or flakes and plastic powder,
The kneaded material is pelletized and then injection-molded to form a rectangular magnetic core member 61. At the time of molding the magnetic core member 61, a start end notch 61e and an end end notch 61f are respectively formed at two corner portions on the diagonal line of the magnetic core member 61, and the insulating sheet 6 is provided on one surface of the magnetic core member 61.
8 is a capacitor 63 and first and second strip conductors 71, 72
Together with this, a substantially linear recess 61a that can be accommodated is formed.

Next, with the insulating sheet 68 facing the bottom surface of the concave portion 61a, the insulating sheet 68 is attached to the capacitor 63.
And the first and second strip-shaped conductors 71, 72 together with the recess 61a
Put it in a box and attach it. Next, after locking the starting end of the winding wire 62 in the starting end notch 61e and winding the winding wire 62 around the magnetic core member 61 in a direction substantially orthogonal to the longitudinal direction of the recess 61a,
The terminal end of the winding wire 62 is locked in the terminal notch 61f. As a result, the end of the winding wire 62 does not float during the manufacturing process of the tag 60, so that the capacitor 63 and the winding wire 62 are not damaged by the end portion of the winding wire 62 during the manufacturing process of the tag 60. Further, at the intersections of the first and second strip-shaped conductors 71 and 72 near the start and end of the winding 62, the winding 62
The first and second strip-shaped conductors 71,
Solder 73, 74 is attached to 72, respectively. Thus, the capacitor 63 and the winding wire 62 can be electrically connected by a very simple operation. Furthermore, the first and second strip conductors 71, 7
2 is accommodated in the concave portion 61a, and the starting end and the terminating end of the winding wire 62 are locked to the magnetic core member 61, so that the intersections thereof are always at the same position of the magnetic core member 61. As a result, the device for the soldering work has a simple structure. After that, the magnetic core member 61 provided with the winding wire 62 is inserted into an injection molding machine and covered with a cover 64.

Although not shown, the first and second strip-shaped conductors 71 and 72 are formed up to the back surface of the insulating sheet 68, or
Alternatively, the insulating sheet 6 on which the capacitor is soldered by a method such as providing a through hole in a portion to be soldered
8 may be housed and attached in the recess 61a of the magnetic core member 61 in the direction opposite to the direction shown in FIG. In this case, the cover 6
4 is formed, the surface of the magnetic core member 61 to which the insulating sheet 68 is attached becomes smoother, and the formation of the cover 64 is facilitated.

12 to 15 show a seventh embodiment of the present invention. In this embodiment, recesses 81a and 81b are formed on both surfaces of the magnetic core member 81 so as to extend in a substantially straight line (FIGS. 12 to 14), and the capacitors 83 and 83 are the first electrodes 83.
a and 83a and the first strip conductors 91 and 91 and the second strip conductors 92 and 92 electrically connected to the second electrodes 83b and 83b (FIG. 15), respectively, are housed in the recesses 81a and 81b (FIG. 12). (FIG. 14). The magnetic core member 81 is formed in a square plate shape, and the recesses 81a and 81b are formed on both surfaces of the magnetic core member 81 so as to extend diagonally thereof. Further, the recesses 81a and 81b are deeper in the center in the longitudinal direction toward the right side of the capacitor accommodating portions 81c and 81d, and a pair of inclined portions that are connected to the capacitor accommodating portions 81c and 81d and that become gradually shallower toward the ends. 81e to 81h,
It has a pair of shallow bottom portions 81i to 81m which are connected to these inclined portions 81e to 81h and have an extremely shallow depth (FIGS. 12 and 13).

Capacitors 83, 83 are chip capacitors, and include first strip conductors 91, 91 and second strip conductors 9.
Insulating sheets 88, 88 having flexibility with 2, 92
It is glued on (FIGS. 12, 13 and 15). The width and length of the insulating sheets 88, 88 are formed to be substantially the same as the width and length of the concave portions 81a, 81b. The first strip-shaped conductor 9
1, 91 extend from the right side of the center of the insulating sheets 88, 88 toward one end, and the second strip-shaped conductors 92, 92 are the insulating sheets 8.
The first band-shaped conductors 91, 91 are provided with a predetermined gap 89, 89 from the right side of the center of 8, 88 and extend toward the other end. The capacitors 83 and 83 are dielectric layers 83c and 83c.
(FIG. 15) is placed so as to face the predetermined gaps 89, 89 between the first strip conductors 91, 91 and the second strip conductors 92, 92, and the first electrodes 83a, 83a and the second electrodes 83b, 83b is electrically connected to the first strip conductors 91, 91 and the second strip conductors 92, 92 by soldering or the like. The windings 82 and 102 are respectively provided on two sets of two sides of the magnetic core member 81 which are parallel to each other, and one winding 8
2 is electrically connected to the first and second strip-shaped conductors 91 and 92 by soldering 93, 94 or the like (FIG. 14), and the vicinity of both ends of the other winding 102 is the first and second strip-shaped conductors. It is electrically connected to 91 and 92 by soldering or the like.

The antitheft tag 80 having the above structure
The manufacturing method of will be described. First, the first strip-shaped conductors 91, 91 and the second strip-shaped conductors 92, 92 are adhered onto the insulating sheets 88, 88, respectively, and then the capacitors 83, 83 are placed on the first strip-shaped conductors 91, 91 and the second strip-shaped conductors 92, 92. The first electrodes 83a, 83a and the second electrodes 83b, 83b of the capacitors 83, 83 on the first strip-shaped conductors 91, 91 and the second strip-shaped conductors 92, 92, respectively. Solder each. On the other hand, a mixture of soft magnetic metal powder or flakes and plastic powder is kneaded, and the kneaded material is pelletized and then injection-molded to form a rectangular magnetic core member 81. At the time of molding the magnetic core member 81, two corner portions on one diagonal line of the magnetic core member 81 and two corner portions on the other diagonal line of the magnetic core member 81 are provided with the notches 81n, 81o for starting ends and the notches 81p for end,
81q respectively, and the insulating sheets 88, 88 are formed on both surfaces of the magnetic core member 81 together with the capacitors 83, 83.
Substantially straight recesses 81a, 81b that can be housed together with the strip conductors 91, 91 and the second strip conductors 92, 92 are formed.

Next, the insulating sheets 88, 88 are formed in the recess 81.
Insulating sheet 8 in a state of facing the bottom surface of a, 81b
8, 88 are capacitors 83, 83 and a first strip conductor 91,
91 and the second strip conductors 92, 92 together with the recess 81a,
Each of them is housed in 81b and attached. Next, the start end of the winding wire 82 is locked in the starting end notch 81n, the winding wire 82 is wound around two parallel sides of the magnetic core member 81, and then the end of the winding wire 82 is turned into the termination notch 81p. Lock. After this, the starting end of the winding 102 is locked in the starting end notch 81o,
After winding the winding wire 102 around the other two parallel sides of the magnetic core member 81, the end of the winding wire 102 is locked to the terminating notch 81q. Further, at the intersection of the first and second strip conductors 91 and 92 near the beginning and end of the winding 82 and the first and second strip conductors 9 near the beginning and end of the winding 82.
Solder 93 and 94 to 1 and 92 respectively, and winding 1
02 near the start end and near the end and the first and second strip-shaped conductors 9
At the intersections with 1, 92, the vicinity of the start end and the end of the winding 102 are soldered to the first and second strip-shaped conductors 91, 92, respectively. Since the manufacturing method other than the above is the same as that of the sixth embodiment, the repeated description is omitted.

The tag 80 includes one magnetic core member 81.
Since the magnetic core directions are in two directions orthogonal to each other, the magnetic core direction of the magnetic core member 81 faces the direction in which the sensitivity of the tag 80 decreases, as in the fourth and fifth embodiments. The probability of passing between antennas is extremely low. That is, when the article passes between the antennas, the two resonance circuit units 87,
Since there is a high probability that the sensitivity of any one of the resonance circuit units 87 or 97 will be good, it is possible to almost certainly prevent the articles from being taken out without permission.

[0042]

As described above, according to the present invention, a magnetic core member is formed of a composite material of soft magnetic metal powder or the like and plastic, and the magnetic core member is wound around the magnetic core member to form a magnetic core. A capacitor housed in the recess of the core member is electrically connected to the winding, and a flexible linear body for suspending the article can be inserted into a covering body that covers the magnetic core member together with the winding and the capacitor. Since the through hole is formed, the tag is attached to the article via the flexible linear body, and the magnetic core direction of the magnetic core member of the tag changes with respect to the article. As a result, the direction of the radio wave generated by the resonance circuit portion configured by the magnetic core member, the winding, and the capacitor resonates, and the tag is unlikely to be affected by the material of the article. As a result, no matter how the surface of the article is made, the change in the self-inductance of the coil portion is small, the change in the resonance frequency of the resonance circuit portion is small, and the Q value of the coil portion is not much decreased. The width of resonance at the resonance frequency becomes sharp, and the resonance characteristics of the tag can be improved.

Further, even if the shape of the article is extremely thin or the surface of the article has many irregularities,
Since the tag can be attached to the article through the flexible linear body and the capacitor is housed in the recess of the magnetic core member,
The plastic that flows into the mold when forming the coating does not damage the capacitor. If a flexible linear body of higher strength is used, the tag cannot be removed from the article without a tool or without force, so that the article can be reliably prevented from being taken out without permission. Further, by providing a non-magnetic and electrically conductive electromagnetic shield plate along one surface of the wound magnetic core member, if this electromagnetic shield plate is covered with a magnetic core member and the like, Since the coil portion consisting of the magnetic core member and the winding is electromagnetically cut off from the surface of the article,
A change in self-inductance and a decrease in Q value can be completely prevented. It is particularly effective when the surface of the article is made of a ferromagnetic material.

If the through hole is formed through the electromagnetic shield plate together with the covering body, or the through hole is formed through the magnetic core member together with the cover body or the covering body and the electromagnetic shield plate, the through hole is formed. Not only the plastic cover around the edge of
Since the tag is composed of the electromagnetic shielding plate and the magnetic core member, even if the tag is forcibly torn from the flexible linear member, the peripheral edge of the through hole is not damaged. As a result, it becomes more difficult to remove the tag from the flexible linear body without permission or by force. Further, if the tag has a plurality of magnetic core members having different magnetic core directions, the probability that the magnetic core of the magnetic core member passes between the antennas in a state in which the sensitivity of the tag is lowered becomes extremely low. That is, when the article passes between the antennas, the probability that the sensitivity of any one of the plurality of resonance circuit sections becomes good becomes high, so that the article can be almost certainly prevented from being taken out without permission.

Further, the recess is formed on the surface of the magnetic core member so as to extend in a substantially straight line, and the capacitor is housed in the recess together with the first and second strip conductors, and the winding direction of the winding wire is different from the longitudinal direction of the recess. Direction, and electrically connecting both ends of the winding to the first and second strip-shaped conductors, the first and second strip-shaped conductors having a relatively large area and accommodated near both ends of the winding. Since they are electrically connected, the electrical connection between the capacitor and the winding, that is, the soldering work can be performed very easily. In addition, a capacitor is connected to the first and second strip-shaped conductors adhered on the substantially straight insulating sheet,
At the time of molding the magnetic core member, a notch for a start end and a notch for a terminal end are formed at a corner portion of the magnetic core member, and a substantially linear concave portion is formed on the surface of the magnetic core member. Attach the tape, lock the start end of the winding in the notch for starting end, wind the winding on the magnetic core member, then lock the end of the winding in the notch for ending, and further close the beginning and end of the winding. When electrically connected to the first and second strip conductors, the ends of the winding do not float during the tag manufacturing process, so that the ends of the winding do not damage the capacitor or the winding. Further, since the first and second strip-shaped conductors and the vicinity of the start end and the end of the winding intersect each other, the electrical connection between the capacitor and the winding is completed by the extremely simple work of soldering these intersections. Furthermore, since the first and second strip-shaped conductors are housed in the recesses and the starting end and the terminating end of the winding are locked to the magnetic core member, their intersections are always at the same position of the magnetic core member. As a result, the device for the soldering work has a simple structure.

[Brief description of drawings]

FIG. 1 is a sectional view taken along the line AA of FIG. 2 showing a theft prevention tag according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line BB of FIG.

FIG. 3 is a sectional view corresponding to FIG. 1 showing a second embodiment of the present invention.

FIG. 4 is a sectional view corresponding to FIG. 1, showing a third embodiment of the present invention.

FIG. 5 is a sectional view taken along line CC of FIG. 6 showing a fourth embodiment of the present invention.

6 is a cross-sectional view taken along line DD of FIG.

FIG. 7 is a sectional view taken along line EE of FIG. 8 showing a fifth embodiment of the present invention.

8 is a cross-sectional view taken along line FF of FIG.

FIG. 9 is a sectional view taken along line GG of FIG. 10 showing a sixth embodiment of the present invention.

10 is a sectional view taken along line HH of FIG.

FIG. 11 is a vertical cross-sectional view of an insulating sheet including a capacitor of the anti-theft tag and first and second strip conductors.

FIG. 12 shows I-I of FIG. 14 showing a seventh embodiment of the present invention.
FIG.

13 is a sectional view taken along line JJ of FIG.

14 is a sectional view taken along line KK of FIG.

FIG. 15 is a vertical cross-sectional view of an insulating sheet including the capacitor of the anti-theft tag and the first and second strip conductors.

[Explanation of symbols]

10, 20, 30, 40, 50, 60, 80 Tags 11, 41, 61, 81 Magnetic core members 11a, 41a, 61a, 81a, 81b Recesses 12, 42, 62, 82, 102 Windings 13, 43, 63 , 83 capacitors 14, 24, 34, 44, 54, 64, 84 coatings 14a, 24a, 34a, 44a, 54a, 64a, 8
4a through-holes 28, 38 electromagnetic shielding plates 61e, 81n, 81o start end notches 61f, 81p, 81q end notches 63a, 83a first electrodes 63b, 83b second electrodes 63c, 83c dielectric layers 68, 88 insulating sheets 69, 89 gaps 71,91 First strip conductor 72,92 Second strip conductor

Front page continued (72) Inventor Tomohiro Mori 1-297 Kitabukuro-cho, Omiya-shi, Saitama Sanryo Materials Co., Ltd. Research Institute (72) Inventor Seiro Yawata 1-1-6 Otemachi, Chiyoda-ku, Tokyo IP Service Co., Ltd. (56) Reference JP-A-7-93671 (JP, A) JP-A-7-235411 (JP, A) JP-A-6-112031 (JP, A) (58) Fields investigated (Int .Cl. ⁷ , DB name) H01F 17/00 H01F 1/12 G08B 13/22 G08B 13/24 H01F 27/36 H04B 1/59 G06K 19/00

Claims (7)

(57) [Claims] 1. A magnetic core member (11, 41, 61, 61, 61, 61, formed of a composite material of soft magnetic metal powder or flakes and plastic.
81) and a winding wire (1) provided on the circumferential surface of the magnetic core member (11, 41, 61, 81).
2,42,62,82,102) and the magnetic core member (11,41,61,81) formed in the recess (11a, 41a, 61a, 81a, 81b) is housed in the winding (12,42, 62,82,102) capacitors electrically connected to
(13,43,63,83), the magnetic core member (11,41,61,81) the winding (12,42,62,82,
102) and the condenser (13, 43, 63, 83) and a through hole (14a, 24a, 34a, 44a, 54a, 64a, 84a) through which a flexible linear body for hanging on an article can be inserted. Anti-theft tag having a plastic covering (14, 24, 34, 44, 54, 64, 84) on which is formed). 2. An electromagnetic shield which is non-magnetic and has conductivity along one surface of a magnetic core member (11, 41, 61, 81) provided with windings (12, 42, 62, 82, 102). A plate (28, 38) is provided, and the electromagnetic shielding plate (28, 38) is a magnetic core member (11, 41, 61, 81), a winding (1
2, 42, 62, 82, 102) and a capacitor (13, 43, 63, 73) together with a cover (14, 24, 34, 44, 54, 64, 84) for preventing theft. . 3. The anti-theft tag according to claim 2, wherein the through hole (24a, 34a) is formed so as to penetrate the electromagnetic shielding plate (28, 38) together with the covering body (24, 34). 4. The anti-theft tag according to claim 1, wherein the through hole is formed so as to penetrate the magnetic core member together with the cover or the cover and the electromagnetic shield plate. 5. A plurality of magnetic core members (41, 4) having different magnetic core directions.
The antitheft tag according to claim 1, which has 1). 6. The recesses (61a, 81a, 81b) are formed on the surface of the magnetic core member (61, 81) so as to extend substantially in a straight line, and the capacitors (63, 83) are the first of the capacitors (63, 83). 1 electrode
First strip conductors (71, 91) and second strip conductors (72, 92) electrically connected to (63a, 83a) and second electrodes (63b, 83b), respectively
Together with the recesses (61a, 81a, 81b), the winding direction of the winding wire (62, 82, 102) is the recesses (61a, 81a, 81b).
Is provided in a direction different from the longitudinal direction of the coil, and the first strip-shaped conductors (71, 91) and the second strip-shaped conductors (72, 92) are electrically connected to both ends of the winding (62, 82, 102) respectively. The anti-theft tag according to any one of claims 1 to 5. 7. A flexible insulating sheet extending in a substantially straight line.
The first strip conductor (71, 91) and the second strip conductor (72,
92) is adhered with a predetermined gap (69, 89) and the first electrode of the capacitor (63, 83) is so arranged that the dielectric layer (63c, 83c) faces the predetermined gap (69, 89). (63a, 83a) and the second electrode (63b, 8)
3b) is the first strip conductor (71, 91) and the second strip conductor (72, 9)
2) electrically connecting to each of them, and at the time of molding the magnetic core member (61, 81), at least two corners of the magnetic core member (61, 81) have notches (61e, 81n, 81o) for starting end and The notches (61f, 81p, 81q) for terminating are formed respectively, and the insulating sheet (68, 88) is provided on at least one surface of the magnetic core member (61, 81) together with the capacitor (63, 83) and the first portion. Forming substantially linear recesses (61a, 81a, 81b) that can be accommodated together with the band-shaped conductors (71, 91) and the second band-shaped conductors (72, 92); and the insulating sheet (68, 88) with the capacitor. (63, 83) and the first strip conductor (71, 91) and the second strip conductor (72, 92) together with the step of accommodating and adhering in the recess (61a, 81a, 81b), and the start end cut ( 61e, 81n, 81o) to the winding core (62, 82, 102) by locking the starting end of the winding (62, 82, 102)
(61, 81) the recess (61a, 81a, 81b) after winding in a direction different from the longitudinal direction of the winding (62, 82, 102) the end of the end cut (61f, 81p, 81q) And a step of electrically connecting the vicinity of the start end and the vicinity of the end of the winding (62, 82, 102) to the first strip conductor (71, 91) and the second strip conductor (72, 92), respectively. Manufacturing method of anti-theft tag including.