JPH11214209A - Antenna core for non-contact data carrier, non-contact data carrier package, and non-contact data carrier system - Google Patents

Abstract

(57) [Problem] To provide an antenna core for a non-contact data carrier, which suppresses deterioration of magnetic characteristics due to external stress caused by resin encapsulation in a non-contact data carrier on the assumption that the entire part is covered with resin, As a result, higher sensitivity of the antenna component is desired. SOLUTION: This is an antenna magnetic core used for a non-contact data carrier package in which a whole part including an antenna coil 1 is resin-sealed, and has a magnetostriction constant of -20 to + 20 × 10 ^-6.
And a wound body in which one or more layers of a ribbon-shaped magnetic material having a magnetic permeability at 100 kHz of 500 or more are wound.
The non-contact data carrier package includes an antenna coil 1 in which a coil conductor 3 is wound around an outer periphery of the above-described antenna core 8, a circuit component electrically connected to the antenna coil 1, and an antenna coil and a circuit component. And a sealing resin that integrally covers the sealing resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a non-contact data carrier antenna magnetic core, a non-contact data carrier package using the same, and a non-contact data carrier system.

[0002]

2. Description of the Related Art A non-contact data carrier system comprises a transponder called a non-contact data carrier attached to an article or the like and an interrogator connected to a host. It performs non-contact data communication via transmission media such as magnetism, induction electromagnetic fields, and microwaves (radio waves). A transponder (non-contact data carrier) in a non-contact data carrier system usually includes an antenna component for transmitting / receiving a signal to / from an interrogator and a circuit component.

[0003] Information transmission systems of the non-contact data carrier system include an electromagnetic coupling system, an electromagnetic induction system, a microwave system, and an optical communication system. Among these systems, those using the electromagnetic coupling system or the microwave system can use the energy of the transmission signal from the interrogator as driving power for the transponder, so that, as in the case of using a battery as a driving source,
There is a further advantage that there is no concern about deterioration of the response capability and use limit due to the approaching end of the battery life.

[0004] In the non-contact data carrier system, a so-called non-contact IC card is assumed to be carried around by a person, and therefore has a thin card shape. If such a non-contact IC card is used for distribution management, etc., it will be easily damaged due to its thinness.
In physical distribution management and the like, a rod-shaped or button-shaped non-contact day carrier is used. Such rod-shaped or button-shaped non-contact data carriers are used by covering the entire components such as antenna components and circuit components with a sealing resin made of epoxy resin, etc. in consideration of environmental resistance and impact resistance. ing.

[0005] In a contactless data carrier system used for distribution management, etc., it is necessary to reliably transmit and receive data regardless of the mounting position of the contactless data carrier (responder). There is a demand for more sensitive antenna components. Further, in a non-contact data carrier system, it is required to extend a communication distance between a transponder (a non-contact data carrier) and an interrogator. From this point, a high sensitivity of an antenna component is also required.

Incidentally, ferrite is generally used as a magnetic core for an antenna of a non-contact data carrier. On the other hand, as an antenna having enhanced transmission / reception sensitivity, for example, as described in Japanese Patent Application Laid-Open No. 2-223205, an antenna in which an antenna coil is wound around the outer periphery of a magnetic core made of an amorphous magnetic material is known. . Further, as a magnetic core material for an antenna, for example, Japanese Unexamined Patent Application Publication No.
Amorphous alloy ribbons and Fe-based microcrystalline alloy ribbons are described.

[0007]

In an antenna component using ferrite as a magnetic core, it is not possible to achieve a higher sensitivity than the current level due to its low magnetic permeability. On the other hand, in the non-contact data carrier system used for distribution management, etc., a rod-shaped or button-shaped non-contact data carrier (responder) in which the whole components such as antenna components and circuit components are covered with resin as described above is used. Therefore, it is necessary to consider the deterioration or breakage of the magnetic properties of the magnetic material for the magnetic core due to the resin sealing.

However, since a magnetic core made of an amorphous magnetic material described in, for example, Japanese Patent Application Laid-Open No. 2-223205 is not considered at all with respect to external stress caused by resin sealing, such a magnetic core is not used. Even if the antenna having the antenna is simply applied to the non-contact data carrier, the sensitivity of the antenna component cannot be increased. This is described in JP-A-2-22.
This is clear from the fact that in the example of the publication No. 3205, an amorphous magnetic material having a large magnetostriction such as about 40 × 10 ⁻⁵ is used. Also, JP-A-7-278763
Japanese Patent Application Publication No. JP-A-2003-133125 merely discloses an amorphous alloy composition generally used as an antenna magnetic core, and similarly does not consider any external stress accompanying resin sealing. The magnetic core is not considered for a non-contact data carrier used by covering the entire part with a resin, and is therefore described in, for example, JP-A-2-223205 and JP-A-7-278763. Even if an amorphous magnetic alloy is simply used as an antenna core of a non-contact data carrier, sufficient characteristics cannot be exhibited due to external stress.

The present invention has been made to address such a problem, and in a non-contact data carrier on the premise that the entire component is covered with resin, even if external stress is applied with resin encapsulation, An antenna core for a non-contact data carrier that has made it possible to increase the sensitivity of antenna components,
Further, it is an object of the present invention to provide a non-contact data carrier package and a non-contact data carrier system capable of increasing the reliability of data transmission and reception and further extending a communication distance by using such a magnetic core. .

[0010]

According to a first aspect of the present invention, there is provided an antenna core for a non-contact data carrier.
An antenna core used for a non-contact data carrier package in which the entire part including the antenna coil is resin-sealed, and has a magnetostriction constant in the range of -20 to + 20 × 10 ^-6 and a magnetic permeability at 100 kHz. It is characterized by comprising a wound body in which one or more layers of a ribbon-shaped magnetic material having a thickness of 500 or more are wound.

In the antenna core for a non-contact data carrier according to the present invention, the ribbon-shaped magnetic material may be, for example,
Has a thickness in the range of 10 to 100 μm,
And having the general _{formula: M a M 'b Si c} B d X e ( wherein, at least one element M is selected from Co, Ni and Fe, M' is Mn, Cr, Ti, Zr, H
f, Mo, Nb, W, Ta, Cu, Ru, Rh, Pd,
X represents at least one element selected from Os, Ir, Pt, Re and Sn, and X represents C, Ge, Ga, P and Al
Represents at least one element selected from the group consisting of a, b,
c, d and e are respectively 60 ≦ a ≦ 90 at%, 0 ≦ b ≦ 10
at%, 3 ≦ c ≦ 20at%, 5 ≦ d ≦ 25at%, 10 ≦ c + d ≦
30at%, 0 ≦ e ≦ 20at%) 20% of the amorphous magnetic alloy ribbon or structure having the composition represented by
The above is a microcrystalline magnetic alloy ribbon made of fine crystal grains having a particle size of 50 nm or less.

Further, in the antenna core for a non-contact data carrier according to the present invention, the wound body of the ribbon-shaped magnetic material may be:
Further, when the winding thickness is t, the average circumference is d, and the height is h, 0.1 ≦ h / d ≦ 2, h /
It is preferable to have a shape satisfying t ≦ 2000. The average circumference in the present invention is the inner circumference d _{1 of the} antenna core.
And the average of the outer circumferential _{d 2 ((d 1 + d} 2) / 2).

Further, in the antenna core for a non-contact data carrier according to the present invention, the ribbon-shaped magnetic material is preferably in the form of claim 4.
It is preferable to use a non-heat-treated material as described in (1). Here, the cross-sectional shape of the antenna core for a non-contact data carrier of the present invention can adopt various shapes such as a circle, an ellipse, and a square, and a non-contact data carrier package is appropriately arranged. It can correspond to an article to be identified.

According to a sixth aspect of the present invention, there is provided a non-contact data carrier package comprising the above-described antenna core for a non-contact data carrier according to the present invention and a coil wound around the outer periphery of the antenna core. An antenna coil having a conductor, a circuit component electrically connected to the antenna coil, and a sealing resin integrally covering the antenna coil and the circuit component are provided.

According to a seventh aspect of the present invention, there is provided a non-contact data carrier package arranged on an article to be identified. The non-contact data carrier package of the present invention may further include, for example, a bobbin having a hollow portion, wherein the antenna core for the non-contact data carrier is disposed in the hollow portion of the bobbin. The antenna coil is provided with a bobbin, and the antenna core for the non-contact data carrier is arranged on an outer peripheral portion of the bobbin.

[0016] According to a tenth aspect of the present invention, there is provided a non-contact data carrier system, comprising: An interrogator installed at a position different from the identified article, which transmits an interrogation signal for reading tag information to the data carrier package and receives and decodes the tag information from the non-contact data carrier package. It is characterized by having.

The antenna core for a non-contact data carrier according to the present invention is formed of a wound body of a ribbon-shaped magnetic material having a small magnetostriction and a high magnetic permeability. In addition, it is possible to suppress the deterioration of the magnetic characteristics of the antenna core due to the external stress applied at that time. In the non-contact data carrier package of the present invention having such an antenna core, the sensitivity of the antenna component can be increased. Therefore, it is possible to increase the reliability of data transmission and reception and further increase the communication distance.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing a schematic structure of one embodiment of a contactless data carrier package of the present invention. In FIG. 1, reference numeral 1 denotes an antenna coil. The antenna coil 1 is configured by winding a coil conductor 3 around a bobbin 2 having an antenna core not shown in FIG. The bobbin 2 is, for example, a polyester resin,
It is made of a thermoplastic resin such as a polyamide resin or an ABS resin, and can be manufactured by injection molding or the like.

The above-described antenna coil 1 includes an IC chip 5 mounted on a substrate 4 and a terminal 4 provided on the substrate 4.
are electrically connected through a. The IC chip 5 as a circuit component has built-in functional units except for a transmitting / receiving antenna of a non-contact data carrier (a transponder described in detail later).

The internal components of the non-contact data carrier package, that is, the antenna chip 1 and the IC chip 5 mounted on the substrate 4 are, for example, an outer case made of polycarbonate resin, polyester resin, polyamide resin, polyphenylene sulfide resin, ABS resin, or the like. 6. In addition, although the shape of the outer case 6 is a cylindrical shape here, it may be a cubic shape,
The present invention is not particularly limited.

An outer case 6 accommodating the internal components 1, 4, and 5 of the non-contact data carrier package.
The inside is filled with a sealing resin 7, and the internal components 1, 4, and 5 are integrally protected and fixed by the sealing resin 7 in a state where the whole is hermetically enclosed. As the sealing resin 7,
A resin such as an epoxy resin, a silicone resin, and a photocurable resin that is liquid at the time of injection and solidifies by reaction with temperature, humidity, light, or the like after injection is used.

As shown in FIG. 2, for example, the antenna coil 1 has an antenna core made up of a wound body 8 in which one or more layers of a ribbon-shaped magnetic material are wound in a cylindrical hollow portion 2a of a bobbin 2. Further, the coil conductor 3 is wound around the outer periphery of the bobbin 2. The winding body 8 made of a thin strip-shaped magnetic material as an antenna core may be arranged on the outer peripheral side of the bobbin 2 as shown in FIG. 3, for example. On this occasion,
The coil conductor 3 is wound around an outer peripheral surface of a wound body 8 of a thin strip-shaped magnetic material via an insulating layer such as an insulating film 9. In addition,
This is not the case when a resin-coated copper wire or the like is used as the coil conductor 3.

As shown in FIGS. 2 and 3, the antenna core may be formed by inserting a wound body 8 of a thin strip-shaped magnetic material into the cylindrical hollow portion 2a of the bobbin 2, or the outer periphery of the bobbin 2. It may be arranged on the part side. However, as the antenna core is arranged closer to the coil conductor 3, the characteristics can be improved. Therefore, the antenna core may be arranged on the outer peripheral side of the bobbin 2 as shown in FIG. preferable.

Although the case where the bobbin 2 is used has been described with reference to FIGS. 2 and 3, the present invention is not limited to this.
It is also possible to directly wind the coil conductor 3 around the antenna core. Further, if a cylindrical circuit component (such as an IC chip) can be used, for example, a thin strip-shaped magnetic material may be wound around the surface to form an antenna magnetic core, and a coil conductor may be wound around the outer periphery. Good.

The wound body 8 of a thin strip-shaped magnetic material as an antenna core has a magnetostriction constant in the range of -20 to + 20 × 10 ^-6 and a magnetic permeability of 500 or more at 100 kHz. As described above, when the antenna coil is formed of the thin strip-shaped magnetic material having a magnetostriction constant in the range of -20 to + 20 × 10 ^-6 , the antenna coil 1 is solidified with the sealing resin 7 (resin sealing). The deterioration of the magnetic characteristics of the antenna core due to external stress applied to the antenna core can be suppressed. More preferably, the magnetostriction constant of the ribbon-shaped magnetic material constituting the antenna core is in the range of -10 to + 10 × 10 ^-6 .

At this time, when the magnetic permeability at 100 kHz of the ribbon-shaped magnetic material constituting the antenna core is 500 or more,
Good antenna characteristics can be obtained by a wound body in which one or more layers of a thin strip-shaped magnetic material having a thickness of about 10 to 100 μm are wound. If the magnetic permeability at 100 kHz is less than 500, characteristics as an antenna cannot be obtained, and a communication distance cannot be secured. 100k of ribbon-shaped magnetic material constituting the antenna core
More preferably, the magnetic permeability at Hz is 1000 or more.

Further, as shown in FIG. 4, the winding body 8 of the thin ribbon-shaped magnetic material as the antenna core has a winding thickness t,
When the average circumference is d and the height is h, 0.1 ≦ h / d ≦ 2,
It is preferable to have a shape satisfying h / t ≦ 2000.
h / t is more preferably 1500 or less.

If h / d is less than 0.1, the sensitivity of the antenna coil 1 cannot be sufficiently improved, and the effect of using the antenna core cannot be sufficiently obtained. On the other hand, if h / d exceeds 2, it becomes difficult to wind the ribbon-shaped magnetic material, and the directivity of the antenna becomes large, which may impair the characteristics required for a non-contact data carrier used for distribution management and the like. growing. Also, h / t is 20
When it exceeds 00, only directivity is generated in the antenna, and the sensitivity of the antenna cannot be improved.

As the antenna magnetic core of the present invention, various ribbon-shaped magnetic materials can be used as long as they satisfy the magnetostriction constant and the magnetic permeability conditions described above. Specific examples of such ribbon-shaped magnetic material, the general formula: M _a M 'in _b Si _{c B d} X _e (wherein, at least one element M is selected from Co, Ni and Fe, M' Is Mn, Cr, Ti, Zr, H
f, Mo, Nb, W, Ta, Cu, Ru, Rh, Pd,
X represents at least one element selected from Os, Ir, Pt, Re and Sn, and X represents C, Ge, Ga, P and Al
Represents at least one element selected from the group consisting of a, b,
c, d and e are respectively 60 ≦ a ≦ 90 at%, 0 ≦ b ≦ 10
at%, 3 ≦ c ≦ 20at%, 5 ≦ d ≦ 25at%, 10 ≦ c + d ≦
30at%, 0 ≦ e ≦ 20at%) 20% of the amorphous magnetic alloy ribbon or structure having the composition represented by
The above includes a microcrystalline magnetic alloy ribbon made of fine crystal grains having a particle diameter of 50 nm or less.

In the alloy composition of the above-described amorphous magnetic alloy ribbon or microcrystalline magnetic alloy ribbon, the M element (C
o, Fe, Ni) are elements that characterize the magnetic properties of the ribbon-shaped magnetic material, and the amount (value of a) is preferably in the range of 60 to 90 at%. If a is less than 60 at%, the magnetic permeability decreases, and the magnetic permeability at 100 kHz is likely to be less than 500. On the other hand, if a exceeds 90 at%, it becomes difficult to make the film amorphous or to form fine grains satisfying the above conditions, and the ribbon itself becomes brittle. The amount of M element is 70-85at%
It is more preferable to set the range as follows.

The M element may be at least one element selected from Co, Fe and Fe, but it is particularly preferable to use Co as a main component which can reduce the magnetostriction without performing heat treatment. This will be described in detail later.

Mn, Cr, Ti, Zr, Hf, Mo, N
b, W, Ta, Cu, Ru, Rh, Pd, Os, Ir,
At least one M 'element selected from Pt, Re, and Sn is an element that improves the magnetic permeability both before and after the heat treatment, and its amount (the value of b) is preferably 10 at% or less. If the amount of the M 'element exceeds 10 at%, the amorphous magnetic alloy ribbon or microcrystalline magnetic alloy ribbon becomes brittle.
More preferably, the amount of the element M 'is in the range of 0 ≦ b ≦ 7 at%.

Si and B, and also C, Ge, Ga,
At least one X element selected from P and Al is
It is an element that contributes to making the ribbon-shaped magnetic material amorphous or microcrystalline. C, d and e representing the amounts of these elements
Are 3 ≦ c ≦ 20at%, 5 ≦ d ≦ 25at%, 10 ≦ c
It is preferable that the range satisfy + d ≦ 30 at% and 0 ≦ e ≦ 20 at%.

If the amount of Si, the amount of B, and the total amount thereof exceed the above-mentioned ranges, the magnetic permeability decreases and the material tends to become brittle. On the other hand, when these amounts are less than the above-mentioned ranges, it becomes difficult to make the particles amorphous or microcrystalline. S
The amount of i, the amount of B and the total amount thereof are respectively 5 ≦ c ≦
It is more preferable to set the range to satisfy 15 at%, 7 ≦ d ≦ 20 at%, and 15 ≦ c + d ≦ 25 at%. The same applies to the element X. When the content exceeds 20 at%, the magnetic permeability decreases. More preferably, the amount of the X element is in a range satisfying 0 ≦ e ≦ 10 at%.

The thickness of the above-mentioned amorphous magnetic alloy ribbon or microcrystalline magnetic alloy ribbon is preferably in the range of 10 to 100 μm. If the thickness of the amorphous magnetic alloy ribbon or the microcrystalline magnetic alloy ribbon exceeds 100 μm, the magnetic permeability becomes low, and a sufficient communication distance may not be secured. On the other hand, even if the thickness of the amorphous magnetic alloy ribbon or the microcrystalline magnetic alloy ribbon is less than 10 μm, not only no further effect can be obtained, but also an increase in the production cost is caused. The thickness of the amorphous magnetic alloy ribbon or microcrystalline magnetic alloy ribbon is more preferably in the range of 10 to 25 μm.

In the above-described amorphous magnetic alloy ribbons and microcrystalline magnetic alloy ribbons, the alloy composition is appropriately set, and an appropriate heat treatment is performed so that the magnetostriction constant is -20 to + 20 × 10 ^−. Can be controlled in the range of ⁶ . Here, the amorphous magnetic alloy ribbon and the microcrystalline magnetic alloy ribbon are usually subjected to a strain relief heat treatment in order to sufficiently exhibit their magnetic properties. However, the amorphous magnetic alloy ribbon and the microcrystalline magnetic alloy ribbon become brittle due to the strain relief heat treatment, and an antenna magnetic core formed using the ribbon becomes more likely to be damaged during resin sealing.

Therefore, it is preferable that the amorphous magnetic alloy ribbon and the microcrystalline magnetic alloy ribbon used for the antenna core of the present invention are not subjected to the heat treatment for removing strain or the heat treatment for accelerating the precipitation of fine crystal grains. That is, the amorphous magnetic alloy ribbon and the microcrystalline magnetic alloy ribbon used for the antenna core of the present invention are preferably non-heat-treated materials. For this reason, it is preferable to apply an alloy composition containing Co as a main component, which can reduce the magnetostriction without performing heat treatment, as the composition of the ribbon-shaped magnetic material.

The contactless data carrier package of the embodiment described above is used in a contactless data carrier system as shown in FIG. 5, for example. FIG. 5 shows the overall configuration of the contactless data carrier system. As shown in FIG. 1, the contactless data carrier system includes an interrogator 10 and a transponder (contactless data carrier) 20.

The interrogator 10 includes a main controller 11 for controlling the entire interrogator 10, an interface 12 for controlling input / output of data with the host device, and tag information received from the non-contact data carrier 20. Read / store
A storage unit 13 such as a writable RAM, a signal conversion unit 14 for converting transmission information from a digital signal to an analog signal, and converting a reception signal from the non-contact data carrier 20 from an analog signal to a digital signal; For example, ASK (Amplitude Shift Keying) method, FSK
(Frequency Shift Keying) system and the like, which modulates a signal for transmission, and a demodulator 16 which demodulates a received signal.
, A transmission antenna 17 and a reception antenna 18.

The transponder (contactless data carrier) 20
A main control unit 21 for controlling the whole non-contact data carrier 20, a storage unit 22 such as an EEPROM for storing tag information which does not require a power supply backup, a unit for converting transmission information from a digital signal to an analog signal, and an interrogator 10; A signal converter 23 for converting a received signal from an analog signal to a digital signal, a modulator 24 for modulating a transmission signal into a signal for transmission by an ASK method, an FSK method, etc., and a demodulator 25 for demodulating the received signal. , A transmission antenna 26 and a reception antenna 27 (actually, the antenna coil 1 having the antenna core of the present invention is integrated).

The basic communication procedure of such a contactless data carrier system is as follows. Interrogator 10
Sends a query signal for reading tag information to the contactless data carrier 20 first. When the contactless data carrier 20 enters the receivable range of the inquiry signal, it receives the inquiry signal and transmits the tag information stored in the storage unit 22 as a response signal. The interrogator 10 receives this response signal,
Decrypt and send to the host device as tag identification information.

As described above, the antenna core for a non-contact data carrier according to the present invention is formed of a thin strip-shaped magnetic material 8 having a small magnetostriction and a high magnetic permeability. Even if resin seal 1 is used, deterioration of the magnetic characteristics of the antenna magnetic core due to external stress applied at that time can be suppressed. In the non-contact data carrier package of the present invention having such an antenna core, the sensitivity of the antenna component can be increased. Therefore, for example, the reliability of data transmission / reception can be improved irrespective of the attachment position of the non-contact data carrier (transponder), and the transponder (non-contact data carrier) 20 shown in FIG. It greatly contributes to the improvement of the characteristics of the contactless data carrier system, for example, it is possible to extend the communication distance with the communication carrier 10.

[0044]

Next, specific examples of the present invention and evaluation results thereof will be described.

Example 1 First, Table 1 shows the alloy composition, plate thickness, magnetostriction, and magnetic permeability.
Six types of amorphous magnetic alloy ribbons were prepared. Of these, Samples 1 to 5 satisfy the conditions of the ribbon-shaped magnetic material of the present invention (Examples), and Sample 6 is a ribbon (Comparative Example) out of the range of the conditions of the ribbon-shaped magnetic material of the present invention. ). The amorphous magnetic alloy ribbons shown in Table 1 are all non-heat-treated materials.

[0046]

[Table 1] Each of the above-mentioned amorphous magnetic alloy ribbons (width 10 mm) is wound so as to have a winding thickness t of 0.05 mm and an outer diameter of 5.9 mm to form an antenna magnetic core. These antenna magnetic cores are made of polyamide resin having an outer diameter of 7.0 mm. Was inserted into a cylindrical hollow part having a diameter of 6.0 mm. An antenna coil was manufactured by winding a copper wire having a diameter of 0.05 mm around the outer periphery of each bobbin for 600 turns (the structure shown in FIG. 2).

Next, a circuit board was connected to each of the antenna coils. Each of these internal parts has an inner diameter of 9 mm and an outer diameter of 10 mm.
Non-contact data carrier package by inserting an appropriate amount of liquid epoxy resin into the outer case after inserting it into the outer case made of polycarbonate resin, and heating it to about 80 ° C in an oven to cure the epoxy resin. Was completed.

In such a non-contact data carrier package, the magnetic characteristics of the antenna core before and after resin sealing,
And the sensitivity of the non-contact data carrier was measured and evaluated.
Specifically, 125kHz, 1V before and after epoxy resin injection
And the communication distance were measured. Table 2 shows the results.

[0049]

[Table 2] As shown in Table 2, the antenna magnetic core made of a wound body of a thin ribbon-shaped magnetic material having small magnetostriction and high magnetic permeability has little deterioration in magnetic characteristics even after being sealed with a resin. It can be seen that by using the core, high sensitivity of the non-contact data carrier can be achieved.

Example 2 Each amorphous magnetic alloy ribbon shown in Table 1 (width 10 mm)
Was wound around a bobbin made of a polyamide resin having an outer diameter of 7 mm so that the winding thickness t became 0.05 mm, respectively, to obtain an antenna magnetic core. After an insulating film was wound around the outer surface of the amorphous magnetic alloy ribbon, a copper wire having a diameter of 0.05 mm was wound 600 turns to produce an antenna coil (the structure shown in FIG. 3).

Next, a circuit board was connected to each of the antenna coils. Each of these internal parts has an inner diameter of 9 mm and an outer diameter of 10 mm.
Non-contact data carrier package by inserting an appropriate amount of liquid epoxy resin into the outer case after inserting it into the outer case made of polycarbonate resin, and heating it to about 80 ° C in an oven to cure the epoxy resin. Was completed.

In such a non-contact data carrier package, the magnetic characteristics of the antenna core before and after resin sealing and the communication distance of the non-contact data carrier were measured and evaluated in the same manner as in Example 1. Table 3 shows the results.

[0053]

[Table 3] As shown in Table 3, the antenna core made of a wound body of a thin ribbon-shaped magnetic material having small magnetostriction and high magnetic permeability has little deterioration in magnetic characteristics even after resin sealing, and such an antenna magnetic core has a small deterioration. It can be seen that by using the core, high sensitivity of the non-contact data carrier can be achieved. Further, it can be seen that the communication distance is further increased in the second embodiment as compared with the first embodiment, and the sensitivity is increased.

Example 3 In Example 1 described above, using the amorphous magnetic alloy ribbon of Sample 1, antenna magnetic cores having the shapes shown in Table 4 were manufactured. Using each of these antenna cores, a non-contact data carrier package was produced in the same manner as in Example 1. Then, the directivity and the communicable distance of these contactless data carrier packages were compared. Table 4 also shows the results.

[0055]

[Table 4] As shown in Table 4, the shape of the antenna core was 0.1 ≦ h /
It is understood that a non-directional and high-sensitivity non-contact data carrier antenna component can be obtained by adopting a shape satisfying d ≦ 2 and h / t ≦ 2000.

When the non-contact data carrier system was constructed by using the non-contact data carrier package according to each of the above-described embodiments, data transmission and reception became reliable and the communication distance could be extended in each case.

[0057]

As described above, according to the antenna magnetic core for a non-contact data carrier of the present invention, it is possible to suppress the deterioration of the magnetic characteristics due to the resin sealing, and to improve the sensitivity of the antenna parts. It becomes possible. Therefore, according to the non-contact data carrier package of the present invention having such an antenna core, it is possible to improve the reliability of data transmission / reception and extend the communication distance. Further, according to the non-contact data carrier system using such a non-contact data carrier package, it is possible to obtain reliable data transmission and reception and a good communication distance.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a schematic structure of one embodiment of a contactless data carrier package of the present invention.

FIG. 2 is a cross-sectional view showing one configuration example of an antenna coil used in the non-contact data carrier package shown in FIG.

FIG. 3 is a cross-sectional view showing another configuration example of the antenna coil used in the non-contact data carrier package shown in FIG.

FIG. 4 is a diagram for explaining the shape of the antenna core of the present invention.

FIG. 5 is a block diagram showing an overall configuration of a contactless data carrier system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Antenna coil 2 ... Bobbin 3 ... Coil conductor 5 ... IC chip 7 ... Sealing resin 8 ... Wound body of thin strip-shaped magnetic material (antenna core)

Continued on the front page (51) Int.Cl. ⁶ Identification code FI H01Q 7/06 H01Q 7/06 H04B 1/59 H04B 1/59 // H04B 5/02 5/02

Claims (10)

[Claims] An antenna core used for a non-contact data carrier package in which a whole part including an antenna coil is resin-sealed, wherein a magnetostriction constant is in a range of -20 to + 20 × 10 ^-6 , 100k
An antenna core for a non-contact data carrier, comprising a wound body formed by winding at least one layer of a thin strip-shaped magnetic material having a magnetic permeability of 500 or more at Hz. 2. A non-contact data carrier antenna core according to claim 1, wherein the ribbon-shaped magnetic material has a thickness in the range of. 10 to 100 [mu] m, and having the general formula: M _a M _'b Si _c B _d X _e (where M is at least one element selected from Co, Ni and Fe, and M ′ is Mn, Cr, Ti, Zr, H
f, Mo, Nb, W, Ta, Cu, Ru, Rh, Pd,
X represents at least one element selected from Os, Ir, Pt, Re and Sn, and X represents C, Ge, Ga, P and Al
Represents at least one element selected from the group consisting of a, b,
c, d and e are respectively 60 ≦ a ≦ 90 at%, 0 ≦ b ≦ 10
at%, 3 ≦ c ≦ 20at%, 5 ≦ d ≦ 25at%, 10 ≦ c + d ≦
30at%, 0 ≦ e ≦ 20at%) 20% of the amorphous magnetic alloy ribbon or structure having the composition represented by
An antenna core for a non-contact data carrier, characterized by comprising a microcrystalline magnetic alloy ribbon comprising microcrystalline particles having a particle diameter of 50 nm or less. 3. The antenna core for a non-contact data carrier according to claim 1, wherein the winding body of the ribbon-shaped magnetic material has a winding thickness of t, an average circumference of d, and a height of h. 0.1 ≦ h / d ≦ 2, h / t
An antenna core for a non-contact data carrier, having a shape satisfying ≦ 2000. 4. The antenna core for a non-contact data carrier according to claim 1, wherein the ribbon-shaped magnetic material is a non-heat-treated material. 5. The non-contact data carrier antenna core according to claim 1, wherein the non-contact data carrier antenna core has a shape selected from a circle, an ellipse, and a square. . 6. An antenna coil having the antenna core for a non-contact data carrier according to any one of claims 1 to 5, and a coil conductor wound around an outer peripheral side of the antenna core. A non-contact data carrier package comprising: a circuit component electrically connected to the antenna coil; and a sealing resin integrally covering the antenna coil and the circuit component. 7. The non-contact data carrier package according to claim 6, wherein the non-contact data carrier package is arranged on an article to be identified. 8. The non-contact data carrier package according to claim 6, wherein the antenna coil includes a bobbin having a hollow portion, and the antenna core for the non-contact data carrier is disposed in the hollow portion of the bobbin. Contactless data carrier package characterized by the following. 9. The non-contact data carrier package according to claim 6, wherein the antenna coil includes a bobbin, and the antenna core for the non-contact data carrier is disposed on an outer peripheral portion of the bobbin. Contactless data carrier package. 10. The method according to claim 6, wherein:
An article to be identified in which the non-contact data carrier package according to the item is disposed in a part thereof, and transmits an interrogation signal for reading tag information to the non-contact data carrier package, and from the non-contact data carrier package. A non-contact data carrier system, comprising: an interrogator installed at a position different from that of the article to be identified, for receiving and decoding the tag information.