JP2002341059A - Wristwatch with built-in tag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To build in an RFID tag having relatively high sensitivity while keeping a high-grade feel. SOLUTION: This wristwatch with a built-in tag is provided with; a watch case 12 having an annular frame 12a, a glass lid 12b and a back lid 12c; a drive part 13 housed in the watch case; an indication part 14 driven by the drive part for indicating a time; and the RFID tag 18 housed in the watch case and composed of an antenna 16 and an IC chip 17. The antenna 16 is provided with a magnetic base material 16a formed along the inside surface of the back lid, a pair of magnetic core members 16b erected on the magnetic base material so as to catch the drive part, and a series of coils 16c spirally wound around the pair of the magnetic core members. The magnetic base material may be formed in a ring-like shape insertable between the annular frame and the drive part, or in a circular arc-like shape along the inside surface of the annular frame. The magnetic base material and the pair of the magnetic core members are formed by injection-molding or compression-molding a composite material and preferably formed so as to have flexibility.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wristwatch incorporating a tag using RFID (Radio Frequency Identification) technology.

[0002]

2. Description of the Related Art Conventionally, there is a plate such as an identification tag or a name tag for visually confirming a person or an article, but only a very limited amount of information can be displayed on this plate. For this reason, in recent years, tags to which an identification function is electronically added using RFID (Radio Frequency Identification) technology are known. The identification tag has an IC chip and an antenna electrically connected to the IC chip. If the identification tag is attached to the plate, the information engraved on the surface of the plate can be visually confirmed. Thus, various information can be stored in the IC chip. For example, the tag-attached plate is attached to a person or an article, and information stored in an IC chip is automatically taken out so that entry / exit management or entry / exit management of the person or the article can be performed.

Recently, such an identification tag has been
2. Description of the Related Art Gates at ski lift lifts and gates at amusement facilities in various amusement parks have been used as identification devices for entry, or as train or bus tickets or commuter passes. If an identification tag is used for such a pass or identification for a ride, passengers trying to get on the lift, or boarding the amusement device, or passengers trying to get on, can use the tag at the gate. The passenger can be identified as a legitimate passenger by a simple operation for approaching the identification means provided in the vehicle. On the other hand, passengers on a lift or on a game machine, a bus, or the like usually wear a wristwatch that displays the time on their arms. For this reason, attempts have been made to incorporate an identification tag into the wristwatch. If this identification tag can be built into a watch, there is no need to carry a separate identification tag separately from the watch, and the identification tag can be worn on the arm without a sense of incongruity. It is expected to expand.

As shown in FIG. 7, a general wristwatch includes an annular frame 2a, a glass cover 2b for sealing the front side of the annular frame 2a, and a back cover 2c for sealing the back side of the annular frame 2a.
, A drive unit 3 housed in the watch case 2, and a display unit 4 housed in the watch case 2 and driven by the drive unit 3 to display time.
In the wristwatch 1, the display unit 4 and the driving unit 3 are accommodated in this order inside the annular frame 2a whose front side is sealed with the glass cover 2b, and finally the back side of the annular frame 2a is sealed with the back cover. It has such a structure. Therefore, when the identification tag is incorporated in the conventional wristwatch 1, a coil is wound around the drive unit 3 which has a relatively large space, that is, the drive unit 3 is surrounded along the inner surface of the annular frame 2a. It is being used as an antenna for an RFID tag. An antenna composed of such a coil has a magnetization axis perpendicular to the dial, and improves the sensitivity of the RFID tag when the watch is held over the identification device by the magnetization axis perpendicular to the dial having the largest area, thereby increasing the working distance. Is expected to be longer.

[0005]

However, in a general wristwatch, an annular frame constituting a watch case is made of a metal having electrical conductivity in order to provide durability and a sense of quality. For this reason, if the antenna is housed in a wristwatch by winding a coil along this frame member, when the antenna receives radio waves, induced current also flows through the frame member, which offsets external radio waves. is there. Further, even when a current flows through a coil constituting the antenna, there is a problem that a current flows through a metal frame member to significantly lower the sensitivity of the antenna, and there is a problem that the working distance of the RFID tag is significantly reduced. In order to solve this problem, it is conceivable to form the frame member of the watch case of the wristwatch with a non-conductive resin. However, if the frame member is formed of the resin, the wristwatch inherently exhibits a sense of high quality. Can not
There is a problem that its durability is also inferior. An object of the present invention is to provide a tag-equipped wristwatch that incorporates an RFID tag in a relatively high sensitivity state without impairing durability and luxury.

[0006]

The invention according to claim 1 is
As shown in FIG. 1, a watch case 12 having an annular frame 12a, a glass lid 12b sealing the front side of the annular frame 12a, and a back lid 12c sealing the back side of the annular frame 12a,
It is composed of a driving unit 13 housed in the watch case 12, a display unit 14 housed in the watch case 12, driven by the driving unit 13 and displaying time, an antenna 16 and an IC chip 17 housed in the watch case 12. This is an improvement of a wristwatch incorporating a tag provided with the RFID tag 18.
The characteristic configuration is that the antenna 16 includes a magnetic base 16 a provided along the inner surface of the back cover 12 c and a pair of magnetic core members 1 erected on the magnetic base 16 a so as to sandwich the driving unit 13.
6b, 16b and a series of coils 16c spirally wound around a pair of magnetic core members 16b, 16b.

In the tag built-in wristwatch according to the first aspect, the magnetic flux in the antenna 16 penetrates from one magnetic core member 16b, passes through the magnetic base material 16a, and passes through the other as shown by the solid line arrow in FIG. Is drawn out of the magnetic core member 16b. For this reason, the pair of magnetic core members 16b, 16
b in a series of coils 16c wound around
The directions of the currents flowing in the vicinity of a are different from each other, and the induced current generated by the coil 16c in the one magnetic core member 16b is canceled by the induced current generated by the coil 16c in the other magnetic core member 16b.
No induced current flows through a. In addition, the magnetic substrate 16
Since a is provided along the inner surface of the back cover 12c, the magnetization axis of the magnetic base 16a is parallel to the back cover 12c, and even if the back cover 12c is formed of metal, eddy currents flow through the back cover 12c. It does not flow, and it is possible to prevent the sensitivity of the antenna 16 from being lowered due to the flow of the induced current and the eddy current.

The invention according to claim 2 is the invention according to claim 1, wherein the magnetic base 16a is formed of the annular frame 12a and the driving unit 1a.
3 is a wristwatch with a built-in tag formed in a ring shape that can be inserted between the wristwatch and the wristwatch. In the tag-equipped wristwatch according to the second aspect, even when there is no gap between the drive unit 13 and the back cover 12c, the magnetic base adapted to the space between the annular frame 12a and the drive unit 13 is suitable. By obtaining the material 16a, the RFID tag 18 can be built into the watch case 12 by effectively utilizing the space between the annular frame 12a and the driving unit 13.

A third aspect of the present invention is the invention according to the first aspect, wherein the magnetic base material 16a is formed of the annular frame 12a and the driving section 1a.
3 is a wristwatch with a built-in tag formed in an arc shape along the inner surface of the annular frame 12a. In the wristwatch with a built-in tag according to the third aspect, there is no gap between the drive unit 13 and the back cover 12c, and even if there is no ring-shaped space between the annular frame 12a and the drive unit 13. , Annular frame 12a
By obtaining the magnetic base material 16a conforming to the shape of the arc-shaped space between the actuator and the drive unit 13, the RFID tag 18 can be built into the watch case 12 by effectively utilizing the arc-shaped space.

The invention according to claim 4 is the invention according to claim 2 or 3, wherein one or both of the magnetic base material 16a and the pair of magnetic core members 16b, 16b are made of soft magnetic ferrite or soft magnetic metal. This is a wristwatch with a built-in tag composed of a composite material obtained by mixing powder or flakes with plastic or rubber. In the wristwatch with a built-in tag according to the fourth aspect, by using the composite material, the antenna having a higher mechanical strength at a relatively high frequency than a conventionally known magnetic core member made of a ferrite sintered body. 1
6 can be obtained.

The invention according to claim 5 is the invention according to claim 4, wherein the composite material contains 10% by volume or more and less than 70% by volume of soft magnetic ferrite or soft magnetic metal powder or flake, and is flexible. It is a wristwatch with a built-in tag configured to have a tag. In the tag-equipped wristwatch according to the fifth aspect, the magnetic base material 16a made of a composite material and the pair of magnetic core members 16b, 16b can be made flexible.
By adapting and deforming the magnetic base material 16a and the pair of magnetic core members 16b, 16b to the shape of the space between the annular frame 12a and the drive unit 13, the space can be used effectively.

The invention according to claim 6 is the invention according to claim 4 or 5, wherein the magnetic material 16a and the pair of magnetic core members 16b,
16b is a wristwatch with a built-in tag integrally formed of a composite material. In the tag-equipped wristwatch according to the sixth aspect, the shapes of the magnetic base material 16a made of a composite material and the pair of magnetic core members 16b, 16b are adapted to the space shape between the annular frame 12a and the drive unit 13. And the space can be used more effectively.

[0013]

Embodiments of the present invention will now be described with reference to the drawings. As shown in FIGS. 1 and 3, the wristwatch 11 includes a watch case 12, a drive unit 13 housed in the case 12, a display unit 14 driven by the drive unit 13 to display time, an antenna 16, and an IC chip. 17 (FIGS. 1 and 2). The case 12 includes an annular frame 12a, a glass lid 12b, and a back lid 12c. The annular frame 12a is formed in a circular ring shape from metal, the glass cover 12b is formed in a disk shape using an electrically insulating material (glass plate), and the back cover 12c is formed in a disk shape using an electrically insulating material (plastic or the like). You. The display unit 14 includes a dial 14 a and a short hand 14 driven by the drive unit 13 and rotating on the dial 14 a.
b, a long hand 14c and a second hand (not shown). The drive unit 13 is configured to rotate the short hand 14b, the long hand 14c and the second hand on the dial 14a to display the time.

As shown in FIG. 1 and FIG.
A magnetic base member 16a provided along the inner surface of the back cover 12c between the annular frame 12a and the driving section 13, and a pair of pin-shaped magnetic core members 16b, 16b erected on the magnetic base member. ,
A coil 16c spirally wound around the magnetic core members 16b, 16b is provided. The magnetic base material 16a in this embodiment is formed in a ring shape that can be inserted between the annular frame 12a and the driving unit 13, and the magnetic core members 16b, 16b are respectively erected at symmetric positions of the magnetic base material 16a. Is done. The magnetic base material 16a and the magnetic core members 16b, 16b may be formed of a composite material of metal or ferrite powder or flakes and plastic, or may be made of Fe (METGLAS2605S-2 manufactured by Allied Chemical) or Co (Allied Chemical). (Eg, METGLAS2714A), or a flexible amorphous foil that can be attached to the inner surface of the annular frame 12a or a laminated material in which the amorphous foil can be attached along the inner surface of the annular frame 12a. .

The ferrite or metal in the composite material is a soft magnetic ferrite or a soft magnetic metal, and as the plastic, a thermoplastic plastic having good workability or a thermosetting plastic having good heat resistance is used. be able to. Also, as the metal powder,
Carbonyl iron powder, atomized powder such as iron-permalloy, reduced iron powder and the like are used. On the other hand, as the metal flakes, the above-mentioned powder is made fine by a ball mill or the like to form the powder, and then the flakes obtained by mechanically flattening the powder or the molten iron- or cobalt-based amorphous alloy are water-cooled. Flake obtained by colliding with copper is used.

A magnetic base material 16a formed of a composite material
Is preferably formed on a flexible member that can be attached along the inner surface of the annular frame 12a. For this reason, it is preferable to use a composite material containing 10% by volume or more and 70% by volume or less of ferrite or metal powder or flake. If the ferrite or metal powder or flakes is less than 10 volumes, the magnetic permeability of the obtained magnetic base material 16a will be low,
In order to obtain the required magnetic permeability, the magnetic base 16a itself needs to be large, and the antenna 16 itself cannot be reduced in size. On the other hand, if the ferrite or metal powder or flakes exceeds 70% by volume, the obtained magnetic base material 16a
May not have flexibility, and the magnetic substrate 1
It may be difficult to deform 6a along the inner surface of annular frame 12a. The particularly preferable range of the ferrite or metal powder or flake is from 25% by volume to 56% by volume.
% By volume.

When the magnetic base material 16a and the magnetic core members 16b, 16b are formed of a composite material, it is preferable that the composite material is injection-molded or compression-molded. The magnetic core base material 16a and the magnetic core members 16b, 16b formed of a composite material are more flexible than those formed of fragile ferrite, and thus are less likely to crack even when thinned. Ferrite or metal powder or flakes are dispersed in plastic,
That is, since the magnetic powder or flakes are mutually insulated by the plastic, the magnetic base material 16a and the magnetic core member 16
b and 16b do not have conductivity as a whole, and no eddy current is generated even when receiving high-frequency radio waves.

The antenna 16 is provided with the pair of magnetic core members 1 described above.
6b, 16b, a series of coils 16c spirally wound around the axis of each magnetic core member 16b, 16b
The coil 16c in this embodiment is made by winding a covered copper wire. When the coated copper wire is energized, the pair of magnetic core members 16b and 16
b is wound so that the magnetic flux generated in b is communicated via the magnetic base material 16a, and the RFID tag 18 is formed by electrically connecting the 1C chip 17 to the coil 16c obtained by winding the coated copper wire. , IC chip 17 is magnetic base material 16a
Mounted on top. The tag 18 thus manufactured has a pair of magnetic core members 16b, 16b around the drive unit 13 and has a shaft center perpendicular to the glass cover at a position sandwiching the drive unit 13. The magnetic base 16a is provided along the inner surface of the back cover 12c between the annular frame 12a and the driving unit 13 in a state where the magnetic base 16a is housed in the watch case. Reference numerals 12d and 12d in FIG. 3 denote a pair of receiving members protruding from the annular frame 12a.
Both ends of the band 19 are pivotally connected to d and 12d, respectively.

As shown in FIG. 4, the IC chip 17 includes a power supply circuit 17a, a radio frequency (RF) circuit 17b, a modulation circuit 17c, a demodulation circuit 17d, a CPU 17e,
A memory 17f connected to the CPU 17e and storing information on the owner of the wristwatch. Power supply circuit 17a
Incorporates a capacitor (not shown), which forms a resonance circuit with the antenna 16. This capacitor is charged with electric power generated by the mutual induction when the antenna 16 receives a radio wave of a specific frequency (frequency at which the resonance circuit resonates). The power supply circuit 17a rectifies and stabilizes this power and supplies it to the CPU 17e to activate the IC chip 17. The memory 17f is a ROM (read o)
nly memory), RAM (ramdom-access memory) and E
EPROM (electrically erasable pogramable read
under the control of the CPU 17e to read stored data in response to a read command by radio wave data communication from the identification means 26, which will be described later, and to read data stored in response to a write command from the identification means 26. Is written.

On the other hand, the identification means 26 for reading the information stored in the IC chip 17 includes a transmitting / receiving antenna 27 which interacts with the antenna 16, transmits a radio wave from the transmitting / receiving antenna 27, and processes the radio wave received by the transmitting / receiving antenna 27. And a display unit 29 for displaying information stored in the IC chip 17. The receiving antenna 27 is configured to transmit radio waves to the antenna 16 of the RFID tag 18 built in the wristwatch 11 and to be able to receive radio waves from the antenna 16. The processing unit 28 includes a transmitting / receiving antenna 27
And a power supply circuit 28a containing a battery, a radio frequency (RF) circuit 28b, a modulation circuit 28c, a demodulation circuit 28d, a CPU 28e, and stores information read from the IC chip 17 connected to the CPU 28e. And a memory 28f. The CPU 28e of the processing unit 28
Is connected to an input unit 28g, and information input by the input unit 28g is configured to be writable to the IC chip 17.

A method of using a wristwatch having a built-in identification tag as described above will be described. First, before wearing the wristwatch 11, the unique information of the person who wears the wristwatch 11 is input from the input unit 28 g of the identification unit 26, and the unique information about the person who wears this wristwatch 11 is stored in the memory 17 f of the IC chip 17. Is stored. In this embodiment, it is assumed that information relating to a train ticket is input, and as the specific input contents, information relating to a boarding start date and an end date and a boarding section that permit boarding of the train is stored in the memory 17f. After the information has been entered, the watch 11 is put on the belt 1
It is mounted via 2,2. In this case, in the wristwatch with a built-in tag 11 of the present invention, the glass cover 12
Since the annular frame 12a exposed around the b is made of a metal material, the high-class feeling inherent in the wristwatch 11 can be exhibited, and the durability inherent in the watch case 12 is ensured. can do.

On the other hand, a discriminating means 26 is provided at the gate at the boarding gate of the station. When a person wearing the wristwatch 11 passes through the gate, the transmitting / receiving antenna 27 of the discriminating means 26 provided at the gate is attached to the watch. Bring 11 closer. The identification means 26 receives the RF signal from the transmitting / receiving antenna 27
A binary digital signal interrogation signal is transmitted to the antenna 16 of the ID tag 18 by radio waves of a specific frequency. The radio wave transmitted from the transmitting / receiving antenna 27 passes through the glass cover 12b and is received by the antenna 16. here,
The coated copper wire forming the coil 16c is wound so that the magnetic flux generated in the pair of magnetic core members 16b, 16b when the coated copper wire is energized communicates via the magnetic base material 16a. The magnetic flux at 16 draws a loop that penetrates from one magnetic core member 16b, passes through the magnetic base material 16a, and exits from the other magnetic core member 16b, as indicated by the solid line arrow in FIG.

For this reason, a pair of magnetic core members 16b, 16b
Frame 12a in a series of coils 16c wound around
The directions of the currents flowing in the vicinity are different from each other, and the induced current generated by the coil 16c in one magnetic core member 16b is canceled by the induced current generated by the coil 16c in the other magnetic core member 16b, and the substantially annular frame 12a
No induced current flows through the circuit. In addition, the magnetic base material 16a
Is provided along the inner surface of the back cover 12c.
6a is parallel to the back cover 12c, and even if the back cover 12c is made of metal,
No eddy current flows in 2c, and it is possible to prevent the sensitivity of the antenna 16 from being reduced due to the flow of the induced current and the eddy current. Further, the magnetic core member 16b,
By providing the antenna 16b, the receiving sensitivity of the antenna 16 itself is improved, and the antenna 16 effectively receives radio waves emitted from the transmitting / receiving antenna 27.

When the antenna 16 of the RFID tag 18 receives a radio wave, the capacitor of the power supply circuit 17a is charged with electric power. The power supply circuit 17a supplies power to the CPU 17e, activates the IC chip 17, and causes the demodulation circuit 17d to reproduce the original digital signal interrogation signal via the RF circuit 17b. The CPU 17e transmits the information on the wristwatch 11 stored in the memory 17f based on the question signal. The transmission of this information is performed by modulating the binarized data signal with the modulation circuit 17c of the IC chip 17, amplifying the data signal with the RF circuit 17b, and transmitting the amplified signal from the antenna 16. The transmitted data is received by the transmission / reception antenna 27 of the identification unit 26, and the processing unit 28
, The information unique to the person wearing the wristwatch is displayed on the display unit 29, and the door provided at the gate is opened to allow the person wearing the wristwatch 11 to get on the train.

In the above-described embodiment, the watch case 12 having the back cover 12c formed in a disc shape with an electrically insulating material (plastic, etc.) has been described, but the back cover 12c is formed of metal. Is also good. Even if the back cover 12c is formed of a metal, the magnetization axis of the magnetic base 16a is parallel to the back cover 12c, and no eddy current flows through the back cover 12c. Can be prevented from lowering.
Further, in the above-described embodiment, the ring-shaped magnetic base material 16a that can be inserted between the annular frame 12a and the driving unit 13 has been described, but a gap is provided between the driving unit 13 and the back cover 12c. As long as it can be accommodated in the gap, as shown in FIG. 5, the magnetic base material 16a may be flat. Furthermore, even when there is no such gap, if the magnetic flux that has entered from one magnetic core member 16b can pass through the magnetic base material 16a and exit from the other magnetic core member 16b,
As shown in FIG. 6, the magnetic base 16a may be formed in an arc shape between the annular frame 12a and the driving unit 13 and along the inner surface of the annular frame 12a.

[0026]

Next, examples of the present invention will be described in detail together with comparative examples. <Comparative Example 1> An annular frame 12a made of stainless steel and having an inner diameter of 28mm and a thickness of 3mm, a glass lid 12b for sealing the front side of the annular frame 12a, and sealing the back side of the annular frame 12a. A watch case 12 having a back cover 12c made of polycarbonate resin was prepared, and a disc-shaped drive unit 13 having an outer diameter of 20 mm was accommodated in the watch case 12. On the other hand, an antenna consisting of only a coil was formed by winding a covered copper wire having a thickness of 0.08 mm five times along the inner surface of the annular frame 12a so as to surround the driving unit 13. This antenna was housed in a watch case to obtain a watch with a built-in tag. This wristwatch was designated as Comparative Example 1.

<Example 1> A watch case 12 identical to that of Comparative Example 1 was prepared, and a drive unit 13 having the same shape and size as Comparative Example 1 was accommodated in this watch case 12. On the other hand, a composite material obtained by mixing 56% by volume of soft magnetic metal powder and 44% by volume of plastic was injection-molded to integrally form a magnetic base 16a and a pair of magnetic core members 16b, 16b. Magnetic substrate 16a
Was formed in a ring shape having an inner diameter of 21 mm and an outer diameter of 27 mm, and a pair of magnetic core members 16 b, 16 b were erected on the magnetic base material 16 a so as to sandwich the drive unit 13. Then, a covered copper wire having a thickness of 0.08 mm is connected to the pair of magnetic core members 16b, 1
A coil 16c wound spirally 20 times on each of the magnetic core members 6b and wound 40 times on both of the pair of magnetic core members 16b, 16b
Was formed to form the antenna 16. The magnetic base material 16a of this antenna was housed in the watch case 12 along the inner surface of the back cover 12c to obtain the tag built-in wristwatch 11. This wristwatch was designated as Example 1.

<Comparative Test> A measuring terminal of a measuring device (4395, manufactured by HEWLETT PACKARD) for measuring the coil characteristics was connected to the coil of the antenna in Comparative Example 1 and Example 1 described above. 56MH
The L value and the Q value of the antenna with respect to the frequency z were measured. Further, an IC chip was connected to each of the coils of the antennas of Comparative Example 1 and Example 1 to obtain 13.56 MHz.
After the RFID tag operated at z, the tag was housed in a battery case. 13.56 MH
The antenna was approached to the transmitting / receiving antenna of the identification means operating at z, and the presence / absence of the operation of the identification means was confirmed. Table 1 shows these results.

[0029]

[Table 1]

As is apparent from Table 1, it is not considered that there is a remarkable difference in the L value between Example 1 and Comparative Example 1. Also,
Although the Q value of Comparative Example 1 was clearly larger than the Q value of Example 1, even if an IC chip was connected to the coil of the antenna of Comparative Example 1, the identification means did not operate.
On the other hand, although the Q value of the first embodiment is smaller than the Q value of the first comparative example, the coil of the antenna of the first embodiment has a smaller I value.
When the C chip was connected, the identification means operated. The reason why the antenna does not operate in Comparative Example 1 is considered to be that the radio wave was canceled out by the induced current flowing through the frame member when the antenna received the radio wave. On the other hand, the first embodiment operates because a series of coils 16c are wound around the pair of magnetic core members 16b, 16b erected on the magnetic base material 16a, so that the radio waves cancel due to the flow of the induced current. It is considered that this is due to the result of suppressing.

[0031]

As described above, according to the present invention, the antenna has a pair of magnetic bases provided along the inner surface of the back cover and a pair of magnetic bases standing on the magnetic base so as to sandwich the drive unit. Since the magnetic core member and the series of coils spirally wound around the pair of magnetic core members are provided, it is possible to prevent an induced current from flowing through the annular frame. In addition, since the magnetic base material is provided along the inner surface of the back cover, the magnetization axis of the magnetic base material is parallel to the back cover, and even if the back cover is formed of metal, eddy current flows through the back cover. However, it is possible to prevent the sensitivity of the antenna from being reduced due to the flow of the induced current and the eddy current. As a result, by forming the annular frame from metal, the durability and the high-grade appearance are not impaired. Even if the RFID tag is built in the metal case having the annular frame, the sensitivity of the antenna caused by the flow of the induced current is increased. Can be prevented from decreasing, and the RFI
The D tag can be built in with relatively high sensitivity.

Further, if the magnetic base material is formed in a ring shape that can be inserted between the annular frame and the drive unit, the RFID tag can be used even if there is no gap between the drive unit and the back cover. If the magnetic base material is formed in an arc shape between the annular frame and the driving portion and along the inner surface of the annular frame,
Even when there is no ring-shaped space between the annular frame and the drive unit, the RFID tag can be built in the watch case. Further, if the magnetic base material and the pair of magnetic core members are formed of a composite material, it is possible to obtain an antenna having relatively high mechanical strength. By adapting and deforming the magnetic base material and the pair of magnetic core members in the space shape between,
The space can be used effectively. In particular, if the composite material is formed by injection molding or compression molding, it becomes possible to form the magnetic base material and the magnetic core member by adapting the space shape between the annular frame and the drive unit from the beginning, The space can be used more effectively.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along the line AA of FIG. 3, showing a tag-equipped wristwatch according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the RFID tag.

FIG. 3 is a plan view of the wristwatch.

FIG. 4 is a block diagram showing the relationship between the RFID tag and the identification means.

FIG. 5 is a sectional view corresponding to FIG. 2, showing another RFID tag of the present invention.

FIG. 6 is a cross-sectional view corresponding to FIG. 2, showing still another RFID tag of the present invention.

FIG. 7 is a sectional view of a conventional general wristwatch.

[Explanation of symbols]

 11 Wrist watch with built-in tag 12 Watch case 12a Ring frame 12b Glass cover 12c Back cover 13 Drive unit 14 Display unit 16 Antenna 16a Magnetic substrate 16b Magnetic core member 16c Coil 17 IC chip 18 RFID tag

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01Q 1/22 H04B 7/26 E 5K067 1/44 G06K 19/00 H 7/08 K H04B 7/26 Q (72) Inventor Seiro Yawata 1-12-14 Koishikawa, Bunkyo-ku, Tokyo Mitsubishi Materials Corporation RF-ID Business Center F-term (reference) 2F002 AA12 AB02 AB03 AB04 AB06 AC01 AC03 AC04 BB02 BB04 GA06 2F082 AA00 BB00 EE02 EE03 EE05 EE08 FF01 FF10 5B035 BA03 BB09 CA01 CA23 5J046 AA04 AA12 AB11 SA06 5J047 AA04 AA12 AB11 EF02 5K067 BB22 EE02 KK01 KK17

Claims (6)

[Claims] A timepiece having an annular frame (12a), a glass lid (12b) for sealing the front side of the annular frame (12a), and a back lid (12c) for sealing the back side of the annular frame (12a). A case (12), a driving unit (13) housed in the watch case (12), and the watch case
A display unit (14) accommodated in (12) and driven by the driving unit (13) to display time, and an antenna (16) and an IC chip (17) accommodated in the watch case (12). RF
In a wristwatch incorporating a tag having an ID tag (18), the antenna (16) includes a magnetic base (16a) provided along the inner surface of the back cover (12c), and the driving unit (13 ) Is sandwiched between the magnetic base material (16a) and a pair of magnetic core members (16b, 16
b) and a tag built-in tag comprising: a pair of coils (16c) spirally wound around the pair of magnetic core members (16b, 16b). 2. A magnetic base (16a) comprising an annular frame (12a) and a drive unit (1).
The wristwatch according to claim 1, wherein the wristwatch is formed in a ring shape that can be inserted between the wristwatch and (3). 3. A magnetic base (16a) comprising an annular frame (12a) and a driving unit (1).
2. The wristwatch according to claim 1, wherein the wristwatch is formed in an arc shape between the third frame and the inner surface of the annular frame. 4. A magnetic substrate (16a) and a pair of magnetic core members (16b,
4. The composite material according to claim 2, wherein one or both of 16b) is made of a composite material obtained by mixing powder or flakes of soft magnetic ferrite or soft magnetic metal with plastic or rubber.
Wristwatch described. 5. The wristwatch according to claim 4, wherein the composite material is configured to include a soft magnetic ferrite or a soft magnetic metal powder or flake in an amount of 10% by volume or more and less than 70% by volume and has flexibility. 6. The composite material according to claim 4, wherein both the magnetic base material (16a) and the pair of magnetic core members (16b, 16b) are integrally formed from the composite material by injection molding or compression molding. 5. Watch according to 5.