RFID tag-containing apparatus and RFID tag-containing seal

An RFID tag-containing apparatus which is capable of alerting a user to leakage of information stored in RFID tags without tailoring the RFID tags. At least one container section is capable of containing at least one article. A receiver section receives information transmitted from an RFID tag attached to the article contained in the container section. When the receiver section receives the information from the RFID tag, a notification signal is output for notifying a user that the information stored in the RFID tag has been be read.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an RFID tag-containing apparatus and an RFID tag-containing seal, which are capable of alerting a user to unintended reading of RFID tag information by a third party.

2. Description of the Related Art

In recent years, RFID tags (Radio Frequency ID tags) also called wireless IC tags have been widely used in sales management, inventory management, or distribution management. In general, an RFID tag is comprised of a small-sized IC chip and a metal antenna, and the IC chip has a size of 0.1 to several mm square. Each RFID tag can be assigned a unique ID. Further, it is possible to collectively write or read data in or from a plurality of RFID tags from a place somewhat remote from the RFID tags.

Many RFID tags are provided with a memory, a logic circuit, and coils, and are capable of reading and writing data by wireless communications. Further, they are capable of performing processing, such as computation, authentication, and encryption, using the logic circuit. A device that reads and writes data is called a reader/writer. The reader/writer is capable of performing wireless communications from a location at a distance of several centimeters to several meters.

Further, some RFID tags have a built-in battery, and others not. The RFID tags without a built-in battery are supplied with power by receiving radio waves from the reader/writer or a RFID tag reader. On the other hand, the RFID tags with a built-in battery are capable of actively transmitting information.

As mentioned above, RFID tags are used for various applications and it is expected that the use of RFID tags will further expand in the future. However, if a malicious third party reads information stored in an RFID tag attached to an article which the user is carrying with him/her, the information can be used for undesirable purposes. For this reason, the development of an apparatus or device is desired which can prevent unintended reading of such information by a third party.

A system disclosed in Japanese Laid-Open Patent Publication (Kokai) No. 2003-123040 is provided with authentication means for determining whether or not reading of information should be permitted. This system allows reading of only information approved by the authentication means for reading.

However, in this conventional system disclosed in Japanese Laid-Open Patent Publication (Kokai) No. 2003-123040, since the authentication means is provided in an RFID tag itself, the RFID tag inevitably becomes larger in size and higher in cost. Further, general-purpose RFID tags without the authentication means are incapable of even alerting the user to leakage of data.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide an RFID tag-containing apparatus which is capable of alerting a user to leakage of information stored in RFID tags without tailoring the RFID tags.

To attain the above object, in a first aspect of the present invention, there is provided an RFID tag-containing apparatus comprising at least one container section that is capable of containing at least one article, a receiver device that receives information transmitted from an RFID tag attached to the article contained in the container section, and a notification signal output device that is operable when the receiver device receives the information, to output a notification signal for notifying the reception.

Preferably, the RFID tag-containing apparatus comprises a notification device that performs at least one of sound generation, light emission, and vibration based on the notification signal output from the notification signal output device.

To attain the above object, in a second aspect of the present invention, there is provided an RFID tag-containing apparatus comprising at least one container section that is capable of containing at least one article, a receiver device that receives information transmitted from an RFID tag attached to the article contained in the container section, a storage section that stores information stored in the RFID tag attached to the article contained in the container section, and setting information indicating whether or not to notify that the information stored in the RFID tag has been read when reading of the information has occurred, and a notification signal output device that is operable when the receiver device receives the information transmitted from the RFID tag, to refer to the storage section to thereby determine whether or not a notification of the reading of the information should be performed, and output a notification signal for the notification when the notification should be performed.

Preferably, the RFID tag-containing apparatus comprises a notification device that performs at least one of sound generation, light emission, and vibration based on the notification signal output from the notification signal output device.

To attain the above object, in a third aspect of the present invention, there is provided an RFID tag-containing apparatus comprising at least one shielded container section that is configured to block radio waves and contains at least one article therein, a receiver device that is disposed at a location close to the shielded container section, for receiving one of information transmitted from an RFID tag attached to the article contained in the shielded container section and a reading signal from an RFID reader, and a notification signal output device that is operable either when the receiver device receives the information transmitted from the RFID tag or when the receiver device receives the reading signal from the RFID reader, to output a notification signal for notifying the reception.

Preferably, the RFID tag-containing apparatus comprises a notification device that performs at least one of sound generation, light emission, and vibration based on the notification signal output from the notification signal output device.

To attain the above object, in a fourth aspect of the present invention, there is provided an RFID tag-containing apparatus comprising at least one shielded state-switchable container section that can be switched between a shielded state in which radio waves are blocked and a non-shielded state in which the radio waves are not blocked, and contains at least one article therein, a receiver device that is disposed at a location close to the shielded state-switchable container section, for receiving one of information transmitted from an RFID tag attached to the article contained in the shielded state-switchable container section and a reading signal from an RFID reader, a notification signal output device that is operable either when the receiver device receives the information transmitted from the RFID tag or when the receiver device receives the reading signal from the RFID reader, to output a notification signal for notifying the reception, and a state switching device that switches a state of the shielded state-switchable container section between the shielded state and the non-shielded state.

Preferably, the shielded state-switchable container comprises a plurality of shielded state-switching container sections, and the state switching device selects one of the shielded state-switchable container sections and switches the state thereof.

Preferably, the RFID tag-containing apparatus comprises a notification device that performs at least one of sound generation, light emission, and vibration based on the notification signal output from the notification signal output device.

To attain the above object, in a fifth aspect of the present invention, there is provided an RFID tag-containing apparatus comprising a body that is formed of a shield material capable of blocking radio waves, the body having at least one container section, at least one cover that is formed of a shield material capable of blocking radio waves, the cover being detachably provided on the body, a receiver device that is disposed at a location close to the body, for receiving one of information transmitted from an RFID tag attached to the article contained in the container section and a reading signal from an RFID reader, and a notification signal output device that is operable either when the receiver device receives the information transmitted from the RFID tag or when the receiver device receives the reading signal from the RFID reader, to output a notification signal for notifying the reception.

To attain the above object, in a sixth aspect of the present invention, there is provided an RFID tag-containing seal comprising a seal that is formed of a sheet-like member capable of blocking radio waves, the seal having one adhesive face and covering an article, a receiver device that is disposed at a location close to the seal, for receiving one of information transmitted from an RFID tag attached to the article covered by the seal and a reading signal from an RFID reader, and a notification signal output device that is operable either when the receiver device receives the information transmitted from the RFID tag or when the receiver device receives the reading signal from the RFID reader, to output a notification signal for notifying the reception.

Preferably, the receiver device and the notification signal output device are attached to the seal.

With the configurations of the RFID tag-containing apparatus and RFID tag-containing seal according to the present invention, it is possible to detect that information stored in an RFID tag which the user is carrying has been or is going to be read, thereby enabling the user to be on the alert for reading of the information by a malicious third party.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention will now be described in detail below with reference to the drawings showing preferred embodiments thereof.

FIG. 1is a schematic view showing the appearance of an RFID tag-containing apparatus according to a first embodiment of the present invention. InFIG. 1, reference numeral1designates a suitcase-type body. Similarly to a general suitcase, the body1can be opened and closed and can be carried by the user. Within the body1, there is formed a container section2that can contain various articles, such as shoes3, a wallet4, a passport5, and a vegetable6. RFID tags3ato6aare attached to the shoes3, the wallet4, the passport5, and the vegetable6, respectively.

Further, inFIG. 1, reference numeral10designates a control section provided in the body1.FIG. 2is a block diagram showing the circuit configuration of the body1inFIG. 1. InFIG. 2, reference numeral15designates a CPU that controls the components of the control section10. The CPU15operates on a program stored in a ROM16. Reference numeral17designates a RAM used as a work area for the CPU15, and the RAM17has a non-volatile area in which a table TBL (seeFIG. 3) is stored. Reference numeral18designates a receiver section that reads information transmitted from the RFID tags. The information read by the receiver section18is supplied to the CPU15.

Further, the receiver section18has a function of outputting a reading signal to the RFID tags to supply power to them. The receiver section18is capable of switching on and off the output of the reading signal for the reading of the RFID tags. While the receiver section18is incapable of supplying power to the RFID tags when the output of the reading signal is OFF, when a RFID tag outputs information in response to a reading signal received from an external reader/writer, the receiver section18is capable of reading the information.

InFIG. 2, reference numeral19designates an operating section having ten keys and other operators. The operating section19outputs a signal in response to an operation by the user to the CPU15. Reference numeral20designates a sound generating section. The sound generating section20generates sound under the control of the CPU15. Further, reference numeral30designates a reader/writer. The reader/writer30is installed e.g. in a predetermined facility.

Next, a description will be given of the operation of the RFID tag-containing apparatus inFIG. 1. First, the user enables the reading signal output function of the receiver section18and causes the receiver section18to sequentially read the RFID tags3a,4a,5a, and6aattached to the shoes3, the wallet4, the passport5, and the vegetable6, respectively. If pieces of information stored in the RFID tags3a,4a,5a, and6aare in printed form and can be viewed, the user may input the information by operating the ten keys and the like of the operating section19. After the receiver section18has read the RFID tags, the user disables the reading signal output function of the receiver section18.

Thus, the information stored in the RFID tags3a,4a,5a, and6ais input via the receiver section18or the operating section19. Then, the input information is written in the table TBL.FIG. 3shows the table TBL in which the information input from the RFID tags3a,4a,5a, and6ais entered. Further, whenever information from an RFID tag is input, the user operates the operating section19to write setting information indicating whether to notify the user that the information from the RFID tag has been read whenever reading of the information by an external reader/writer occurs. InFIG. 3, the table TBL is set such that when information stored in the RFID tags4aand5ais read by an external reader/writer, the user is notified of the fact.

Let it be assumed that the reader/writer30is possessed by a malicious third party, and the user carrying the body1is approaching the reader/writer30. In this case, when the body1enters the reading range of the reader/writer30, the RFID tags3a,4a,5a, and6aare supplied with power simultaneously, and the information stored therein is output. The information is received not only by the reader/writer30but also by the receiver section18.

Each piece of information read from an associated RFID tag by the receiver section18is supplied to the CPU15. The CPU15refers to the table TBL based on the information and determines whether or not to notify the user that the information in the RFID tag has been read by the external reader/writer30. Since in the illustrated example, the RFID tag4aof the wallet4and the RFID5aof the passport5are set such that the user is to be notified, the CPU15instructs the sound generating section20to generate sound. Thus, the user knows that the information stored in the RFID tags associated with the articles contained in the body1has been read by the external reader/writer30, and hence can be on the alert. In this case, if the reader/writer30can be detected, the user can negotiate with the owner of the reader/writer30.

Further, if the user carrying the body1is passing e.g. through an airport gate provided with a reader/writer, and the body1enters the reading range of the reader/writer, sound is output by the sound generating section20similarly to the above described case. In this case, however, from the situation that the user is passing through the airport gate, he/she can judge that the RFID information is being normally read by the reader/writer managed by the airport authorities, and recognizes that he/she need not be particularly on the alert.

In this way, the user can judge whether or not he/she is in a situation in which information is to be normally read from the RFID tags, so that when hearing the sound generated by the sound generating section20, the user can determine whether or not to be on the alert.

Further, in the first embodiment, the user can set in the table TBL whether or not the user needs to be notified that information stored in RFID tags in the container section2has been read by an external reader/writer. Therefore, for example, when only numerous vegetables5are contained in the container section2, the table TBL may be configured such that no notification is given even if the information is read by any reader/writer. In short, the table TBL can be set such that no notification is issued about information which is regarded as so low in required security level that the user need not monitor the reading thereof. This makes it possible to prevent the nuisance of being notified whenever information low in required security level is read by a reader/writer. Further, by virtue of the provision of the table TBL, the user can select between respective options of being notified and not being notified that information has been read from an RFID tag stored in the container section2, by an external reader/writer, and moreover, even if information stored in an RFID tag possessed by a person being present near the user is read, the user is not notified of the fact. This enables the user to monitor only his/her own RFID tags.

FIG. 4is a perspective view showing the appearance of an RFID tag-containing apparatus according to the second embodiment of the present invention. Reference numeral40inFIG. 4designates a body. The body40is in the form of a foldable wallet. Reference numeral41designates a shielded container section. The shielded container section41has a container part that can contain several cards C having the size of a commuter pass or that of credit cards. The shielded container section41has an open upper part, as viewed inFIG. 4, through which a card can be put in and taken out. Reference numeral41adesignates a flap for covering the open upper part. When the flap41ais raised, the opening of the shielded container section41is exposed. The shielded container section41including the flap41ahas been subjected to an electromagnetic shielding treatment. Therefore, the cards contained in the shielded container section41cannot be accessed by radio waves from outside.

Reference numeral42inFIG. 4designates a non-shielded container section. Similarly to the shielded container section41, the non-shielded container section42has a container part that can contain several cards C. The non-shielded container section42has an upper end thereof formed with an opening42a, but is not provided with a flap or lid. Further, the non-shielded container section42has an opening42bformed in a front face thereof, as viewed inFIG. 4, so that a card contained in the non-shielded container section42can be viewed through the opening42b. The shielded container section41and the non-shielded container section42are joined to each other by a joint43, as shown inFIG. 4, such that the body40can be folded along the joint43. The body40in the folded state can be received in a breast pocket of a shirt or a jacket.

Reference numeral45inFIG. 4designates an antenna section attached to a lower part of a front face of the shielded container section41, as viewed inFIG. 4. The antenna section45receives a reading signal output from an RFID reader/writer. Further, a microspeaker SP is mounted on the front face of the shielded container section41in the vicinity of the antenna section45. The antenna section45and the microspeaker SP are electrically connected to a notification circuit46provided in the shielded container section41, by shielded connection wires, not shown.

The notification circuit46is configured as shown inFIG. 5. Reference numeral46ainFIG. 5designates a power generating section that generates and outputs a power generation detection signal when receiving an electromotive force generated by excitation of the antenna section45having received a reading signal. Upon receiving the power generation detection signal from the power generating section46a, a notification signal generating section46bgenerates a notification signal for causing the microspeaker SP to sound. When the body40constructed as above enters the reading range of a reader/writer to receive a reading signal therefrom, a notification sound is output from the microspeaker SP.

Next, a description will be given of the operation of the RFID tag container apparatus of the second embodiment. First, the user puts RFID tags or RFID-tagged cards or the like in the shielded container section41. Then, the user goes to various places with the body40. If an RFID reader is provided in a place visited by the user, when the body40enters the reading range of the RFID reader, the antenna section45receives a reading signal. As a result, the power generating section46agenerates the power generation detection signal, and the notification signal generating section46bgenerates the notification signal, so that the microspeaker SP generates the notification sound.

This makes the user aware of the presence of the reader/writer around the user. When the user is e.g. near a check-out counter in a supermarket, a ticket gate in a railroad station, or a gate in an airport, the user can judge that he/she is in a situation where RFID tags are normally read. In this case, the user takes out an associated RFID tag or RFID-tagged card C from the shielded container section41, and allows the reader/writer to read RFID tag information. Alternatively, the user can move the taken-out card C from the shielded container section41to the non-shielded container section42to thereby allow the reader/writer to read RFID tag information.

Even when the notification sound is output from the microspeaker SP, if the user judges that he/she is in a place improper for allowing RFID tag information to be read, the user ignores the notification sound without taking out the associated card from the shielded container section41.

As described above, according to the present embodiment, RFID tag or tags within the shielded container section41are not yet read at the time the notification sound is output, so that it is possible to prevent important personal information or the like from being read. Meanwhile, in a situation where RFID tag information needs to be read, the user has only to take out the associated card C from the shielded container section41.

It should be noted that the notification signal generating section46bmay be provided with a switch48for stopping the output of the notification sound. With this configuration, the output of the notification sound can be stopped simply by pressing the switch48earliest possible after recognition of the sound.

Although in the above described embodiment, the shielded container section41has a size which allows storage of several cards or the like, this is not limitative, but the shielded container section41may be formed to have a larger capacity. Further, the non-shielded container section42may not be provided. In this case, when the notification sound is output, an associated RFID-tagged card is taken out from the shielded container section41to allow the same to be read by the reader/writer.

FIG. 6is a perspective view showing the appearance of an RFID tag-containing apparatus according to the third embodiment of the present invention. InFIG. 6, reference numeral50designates a suitcase-type body. The body50is provided therein with a plurality of magnetically shielded parallelepiped shielded container sections51to54. The front faces of the respective shielded container sections51to54, as viewed inFIG. 6, are exposed on a surface of the body50. In the exposed faces of the respective shielded container sections51to54, there are provided shutter devices51ato54a, respectively. When any of the shutter devices51ato54ais opened, an article can be put in and taken out of an associated one of the shielded container sections51to54. Further, when any of the shutter devices51ato54ais open, the interior of an associated one of the shielded container sections51to54is communicated with the external space via its opening, and therefore the shielded container section becomes unshielded. The body50is provided with a control section55, described below with reference toFIG. 7.

FIG. 7is a block diagram showing the circuit configuration of the RFID tag-containing apparatus of the present embodiment. InFIG. 7, component parts and elements corresponding to those shown inFIG. 2are designated by identical reference numerals, and detailed description thereof is omitted. When an antenna section57of the control section55, which is exposed on a surface of the body50, receives a reading signal from an RFID tag reader/writer, a receiver section56generates a detection signal and outputs the same to the CPU15. The receiver section56may be identical in configuration to the power generating section46ainFIG. 5.

The CPU15supplies a control signal to a selected one of the shutter devices51ato54ain response to an operation of the operating section19so as to control opening/closing of the shutter device. In other words, the user can operate the operating section19to instruct the CPU15to open or close a selected one of the shutter devices51ato54a.

Next, a description will be given of the operation of the thus constructed RFID tag-containing apparatus of the present embodiment. First, the user puts RFID tags or RFID-tagged articles in the respective shielded container sections51to54. Then, when the user carrying the body50enters the reading range of an RFID reader/writer, the antenna section57receives a reading signal. In response to the reading signal, the receiver section56supplies a detection signal to the CPU15to cause the sound generating section20to generate sound.

The sound generated by the sound generating section20makes the user aware of the presence of the reader/writer around the user. When the user is e.g. near a check-out counter in a supermarket, a ticket gate in a railroad station, or a gate in an airport, the user can judge that he/she is in a situation where RFID tags are normally read. In this case, to unshield one of the shielded container sections51to54which contains an RFID tag relevant to the situation, the user opens an associated one of the shutter devices51ato54aby operating the operating section19. The RFID tag attached to an article contained in the shielded container section having its shutter device opened is read by the reader/writer.

Even when the sound generating section20generates the notification sound, if the user judges that he/she is in a place improper for allowing RFID tag information to be read, the user ignores the notification sound without opening any of the shutter devices51ato54a.

As described above, according to the present embodiment, none of the RFID tags within the shielded container sections51to54are not yet read at the time the notification sound is output, so that it is possible to prevent important personal information or the like from being read. Further, in a situation where an RFID tag within one of the shielded container sections51to54needs to be read, the user can unshield only the shielded container section relevant to the situation to make the required RFID tag alone readable.

The method of unshielding the shielded container sections51to54is not limited to the use of the shutter devices, but any method may be employed which enables switching between the shielded state and the non-shielded state.

Further, information designating a shutter device to be opened when the antenna section57receives a reading signal may be written in a table TBL2provided in a non-volatile area of the RAM17, to thereby allow the shutter device designated in the table TBL2to be automatically opened when the receiver section56outputs the detection signal. In this case, if there is an RFID tag which is frequently read in a certain area, the RFID tag may be stored in a shielded container section associated with opening-instructing information written in the table TBL2. Then, when the notification sound is output, the shielded container section is automatically unshielded without the user operating the operating section19, and therefore it is possible to save the user's time and labor. Although in the present embodiment, a plurality of shielded container sections are provided, the body50may have a single shielded container section.

The present invention is not limited to the above described embodiments, and can be practiced in various forms.

If it is desired in the first embodiment described above that a notification is issued when any one of the RFID tags contained in the container section2has been read, the table TBL may be eliminated. In this case, when information on the read RFID tag is supplied from the receiver section18, the CPU15may cause the sound generating section20to output the notification sound.

Further, the notification sound may be generated using a simple waveform or alternatively a complicated waveform such as a melody or the like. Furthermore, different kinds of sounds may be used for the respective RFID tags. This enables the user to determine, simply by hearing a notification sound, whether or not the sound is generated for an RFID tag for security of which the user should be on the alert. To vary the sounding mode every RFID tag, for example, information on a sounding mode to be used may be written in advance in the table TBL in association with each RFID tag, and the CPU15may be configured to refer to the table TBL to instruct the sound generating section20to generate sound in the associated sounding mode.

Although in the above described embodiments, notification is performed using sound, this is not limitative, but light from an LED or the like or vibration from a vibrator may be used. In short, any notification means may be used insofar as it can make the user aware that an RFID tag has been (or is going to be) read.

Further, the notification means may be provided separately from the RFID tag container section(s). For example, an incoming call tone of a cellular phone or a vibrator may be used as notification means. In this case, radio waves (such as Bluetooth) may be used to output a notification signal. The cellular phone used for this purpose is configured such that an incoming call tone is sounded or the vibrator is driven when the notification signal is received.

In the second and third embodiments, the notification sound is output when a reading signal from a reader/writer is detected, but instead, the notification sound may be output upon detection of information transmitted in response to a reader/writer reading a freely-readable dummy RFID tag exposed in a non-shielded state.

Although in the above described third embodiment, the respective shutter devices51ato54aof the shielded container sections51to54are configured to be automatically opened and closed, the shutter devices51ato54amay be opened and closed manually. In this case, the user directly or manually operates the shutter device in place of issuing an opening/closing instruction using the operating section19.

Further, to unshield the shielded container sections51to54manually, other various configurations can be envisaged.FIG. 8shows one example of the configuration.FIG. 8is a perspective view showing the appearance of an RFID tag-containing apparatus according to a fourth embodiment of the present invention. Reference numeral60inFIG. 8designates a bag having a pocket section61. The pocket section61is comprised of a container section61afor containing an article, and a cover61bformed of a soft material (cloth or vinyl) for covering the container section61a. The container section61aand the cover61bare shielded by respective shielding members. The container section61ahas a parallelepiped space, and a mating surface fastener62is attached to all sides of the container section61a. The cover61balso has a mating surface fastener63attached to all sides thereof. When the mating surface fasteners62and63are engaged with each other, the container section61ais fully closed by the cover61bso as to block a radio wave from being transmitted into or out of the container section61a.

The antenna section45and the microspeaker SP are arranged in the vicinity of the pocket section61in a state exposed to the outside, and the notification circuit46is provided within the bag60. This arrangement of the present embodiment is identical to that shown inFIG. 5.

With the arrangement described above, the user puts a RFID tag or RFID-tagged article in the container section61aand closes the container section61awith the cover61b. Then, when the bag60enters the reading range of an RFID reader/writer, the antenna section45receives a reading signal, and a notification sound is output from the microspeaker SP. When the user hears the notification sound and judges that he/she is in a proper place where the RFID tag is normally read, he/she opens the cover61bto electromagnetically expose the container section61a, and allows the RFID tag within the container section61ato be read. If the user hears the notification sound in an improper place for allowing the RFID tag to be read, the user leaves the container section61acovered by the cover61bwithout opening the same.

FIG. 9is a perspective view showing the appearance of an RFID tag-containing seal according to a fifth embodiment of the present invention.

Reference numeral70inFIG. 9designates an attaché case-type metal case formed of a metal material, such as aluminum or duralumin. The antenna section45and the microspeaker SP are arranged on an upper part of the metal case70in a state exposed to the outside, as viewed inFIG. 9, and the notification circuit46is provided inside the metal case70. This arrangement of the present embodiment is identical to that shown inFIG. 5. Reference numeral80designates a shield seal formed of an electrically conductive material. In the illustrated example, the shield seal80has a shape of a square whose sides are approximately 5 cm long. The shield seal80has a back surface thereof coated with an adhesive so that the shield seal80can be affixed to or peeled off the surface of the metal case70as required.

With this arrangement, the user affixes an RFID-tagged article, such as a card85, to the surface of the metal case70, in a state covered by the shield seal80. Then, when the metal case70enters the reading range of an RFID reader/writer, the antenna section45receives a reading signal, and a notification sound is output from the microspeaker SP. When the user hears the notification sound and judges that he/she is in a proper place, he/she peels off the shield seal80and electromagnetically exposes the card85to allow an RFID tag attached to the card85to be read. If the user hears the notification sound when he/she is in an improper place for allowing the reading, the user leaves the card85covered by the shield seal80without peeling off the shield seal80.

A plurality of shield seals80may be affixed to the metal case70as shown inFIG. 9. Further, an RFID tag86itself may be attached to the metal case70by the associated shield seal80.

Further, if the metal case70has a recess70aformed in the surface thereof such that the recess70acan be covered by a shield seal80, even a slightly thicker article can be contained in the recess70a. Further, the shape and/or size of the shield seal80may be arbitrarily selected according to use thereof. Moreover, if the shield seals80are colored or patterned, it is possible to identify a shield seal80to be peeled off when the notification sound is output, which is convenient to the user.

Furthermore, the antenna section45, the microspeaker SP, and the notification circuit46may be provided in a shield seal80as shown inFIG. 10. In this case, it is not necessary to provide the antenna section45, the microspeaker SP, and the notification circuit46on the metal case70, and hence a general metal case can be used. Moreover, the antenna section45, the microspeaker SP, and the notification circuit46may be formed as a notification unit90as shown inFIG. 11. In this case, the notification unit90is attached to the metal case70using an adhesive or something like a string.