Source: http://www.google.com/patents/US6830193?dq=821,393
Timestamp: 2017-02-27 05:42:47
Document Index: 269236493

Matched Legal Cases: ['art.\n7', 'art 17', 'art 17', 'art 17', 'art 17', 'art 17', 'art 17', 'art 17', 'art 17']

Patent US6830193 - Non-contact IC card - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA non-contact IC card includes an information storage unit for storing information, a communication controller for controlling communication with an external device, and a loop antenna for transmitting and receiving a radio wave to and from the external device. The non-contact IC card further includes...http://www.google.com/patents/US6830193?utm_source=gb-gplus-sharePatent US6830193 - Non-contact IC cardAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS6830193 B2Publication typeGrantApplication numberUS 10/304,266Publication dateDec 14, 2004Filing dateNov 26, 2002Priority dateNov 29, 2001Fee statusLapsedAlso published asDE60209036D1, DE60209036T2, EP1442423A2, EP1442423B1, US20030116634, WO2003046823A2, WO2003046823A3Publication number10304266, 304266, US 6830193 B2, US 6830193B2, US-B2-6830193, US6830193 B2, US6830193B2InventorsMasahiko TanakaOriginal AssigneeMatsushita Electric Industrial Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (16), Non-Patent Citations (2), Referenced by (63), Classifications (30), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetNon-contact IC card
US 6830193 B2Abstract
an information storage unit for storing information; a communication controller for controlling communication with an external device; a loop antenna including a plurality of loop coils having different loop areas for transmitting and receiving a radio wave to and from the external device; and a changeover switch for changing a communication distance between n the external device and the card by selecting one of said plurality of loop coils, wherein the loop coils of the loop antenna include respective fixed conductors, each of which is fixed to a body of the card and shaped to include a gap at a loop part, and a movable conductor which moves with the changeover switch and is removable from the gap of the fixed conductor, and when the changeover switch is inserted in the gap of the fixed conductor of one of the loop coils, the movable conductor is coupled to the corresponding fixed conductor. 2. The non-contact IC card of claim 1, wherein the fixed conductor includes a conductor terminal at a part thereof which connects with the movable conductor, the movable conductor includes a conductor terminal at a part thereof which connects with the fixed conductor, and the conductor terminal of the movable conductor contacts the conductor terminal of the fixed conductor when the movable conductor is inserted in the gap of the fixed conductor.
3. The non-contact IC card of claim 1, wherein the movable conductor is inductively coupled to the fixed conductor without contacting the fixed conductor when the movable conductor is inserted in the gap of the fixed conductor.
4. A non-contact IC card according to claim 1, wherein said different loop areas provide respectively different antenna gain.
5. A non-contact IC card comprising;
an information storage unit for storing information; a communication controller for controlling communication with an external device; a loop antenna including a plurality of loop coils having different loop areas for transmitting and receiving a radio wave to and from the external device; and a cut-off unit for forcibly cutting off the communication with the external device, wherein the cut-off unit includes a changeover switch for switch the loop antenna between a state in which transmission and reception are possible and a state in which the transmission and reception are impossible, and the loop antenna includes a loop coil, the loop coil includes a fixed conductor, which is fixed to a body of the card and shaped to include a gap at a loop part, and a movable conductor which moves with the changeover switch and is removable from the gap of the fixed conductor, and the movable conductor is coupled to the fixed conductor when the movable conductor of the changeover switch is inserted in the gap of the fixed conductor. 6. The non-contact IC card of claim 5, wherein the changeover switch includes a push part removable from the gap of the fixed conductor, and a spring for energizing the push part in a direction that removes the push part from the gap or the fixed conductor, and the movable conductor moves with the push part.
7. The non-contact IC card of claim 5, wherein the fixed conductor includes a conductor terminal at a part thereof which connects with the movable conductor, the movable conductor includes a conductor terminal at a part thereof which connects with the fixed conductor, and the conductor terminal of the movable conductor contacts the conductor terminal, of the fixed conductor when the movable conductor is inserted in the gap of the fixed conductor.
8. The non-contact IC card of claim 5, wherein the movable conductor is inductively coupled to the fixed conductor without contacting the fixed conductor when the movable conductor is inserted in the gap of the fixed conductor.
9. The non-contact IC card of claim 5, wherein the cut-off unit includes a changeover chip detachable from the loop antenna, the loop antenna becomes usable when the changeover chip is mounted to the loop antenna, and the loop antenna becomes impossible to use when the changeover chip is detached from the loop antenna.
10. The non-contact IC card of claim 9, wherein the loop antenna includes a loop coil, the loop coil includes a fixed conductor, which is fixed to a body of the card and shaped to include a gap at a loop part, and a movable conductor which is fixed to the changeover chip and removable from the gap of the fixed conductor, a the movable conductor is coupled to the fixed conductor when the changeover chip is placed in the gap of the fixed conductor of the loop antenna.
11. The non-contact IC card of claim 10, wherein the fixed conductor includes a conductor terminal at a part thereof which connects with the movable conductor, the movable conductor includes a conductor terminal at a part thereof which connects with the fixed conductor, and the conductor terminal of the movable conductor contacts the conductor terminal of the fixed conductor when the movable conductor is inserted in the gap of the fixed conductor.
12. The non-contact IC card of claim 10, wherein the movable conductor is inductively coupled to the fixed conductor without contacting the fixed conductor when the movable conductor is inserted in the gap of the fixed conductor.
13. A non-contact IC card according to claim 5, wherein said different loop areas provide respectively different antenna gain.
14. A non-contact IC card according to claim 13, wherein said cut-off unit is also for selecting one of said plurality of loop coils.
The present invention relates to a non-contact IC card for use in a radio frequency Identification (RFID) system. More particularly, this invention relates to a non-contact IC card for use in a non-contact IC card system in which personal data is read in non-contact condition.
A non-contact IC card disclosed in Japanese Unexamined Patent Publication No. 10-312445 (1998) is known as a conventional non-contact IC card.
FIG. 17 is a block diagram of the conventional non-contact IC card.
In FIG. 17, non-contact IC card 19 permits its stored information to be read in non-contact condition. Proximity type non-contact unit 20 is constructed of proximity type antenna 21 and proximity type communication controller 22. Proximity type antenna 21 transmits and receives a radio wave in communication with a nearby external device or in reception of electric power from the nearby external device. Proximity type communication controller 22 includes proximity modulator/demodulator 23 and proximity power supply 24. Proximity modulator/demodulator 23 has the function of controlling data communication with the nearby external device, and proximity power supply 24 has the function of converting the radio wave, which is incident on proximity type antenna 21 from the nearby external device, to the electric power.
Remote type non-contact unit 25 is constructed of remote type antenna 26 and remote type communication controller 27. Remote type antenna 26 transmits and receives a radio wave in communication with a remote external device or in reception of electric power from the remote external device. Remote type communication controller 27 includes remote modulator/demodulator 28 and remote power supply 29. Remote modulator/demodulator 28 has the function of controlling data communication with the remote external device, and remote power supply 29 has the function of converting the radio wave, which is incident on remote type antenna 26 from the remote external device, to the electric power.
Microprocessor (MPU) 30 includes information storage unit 31, which stores a program for processing information within non-contact IC card 19 in response to an external instruction, and information processing unit 32, which runs the program stored in information storage unit 31 in accordance with the external instruction to perform information processing such as operation on data.
Power storage unit 33 stores the electric power, which is transmitted from proximity and remote power supplies 24, 29, temporarily and supplies the electric power to effect the operation of information processing unit 32.
By having the structure described above, one non-contact IC card 19 is usable both in proximate and remote modes. Moreover, a program for automatically discriminating between the proximate mode and the remote mode based on the received radio wave is stored in information storage unit 31. When the radio wave is received, information processing unit 32 runs this program, so that internal processing in IC card 19 can be set automatically, the proximity type function can be performed in a field requiring high security, and the remote type function can be performed in a field requiring convenience.
Because above-described conventional non-contact IC card 19 includes the antenna and the communication controller for each of the proximate and remote modes, it is difficult to reduce the size and cost of IC card 19. Since it has been desired recently that a non-contact IC card be small, low-cost and usable both in a long-distance non-contact IC card system (e.g. an entry and exit system) and in a noncontact IC card system (e.g. a financial system) requiring high security, reduced size and reduced cost are demanded of the non-contact IC card.
Conventional non-contact IC card 19 is hard to use in the non-contact IC card system that requires contact use for high security because the setting of whether IC card 19 is used at great distance or in contact condition depends on the radio wave received from the external device.
Further, a non-contact IC card incorporating many services is on its way to becoming mainstream. Accordingly, it is desired that its IC chip be usable both in the long-distance non-contact IC card system and in the non-contact IC card system used for the service requiring high security and be low-cost and small.
The above-described conventional non-contact IC card, however, uses an IC chip, the size and cost of which are hard to reduce, because this conventional IC card requires antennas 21, 26 of proximity and remote types, communication controllers 22, 27 of proximity and remote types and others for use in the long-distance non-contact IC card system and in the non-contact IC card system requiring the contact use.
A non-contact IC card includes:
FIG. 1 is a block diagram of a non-contact IC card system in accordance with a first exemplary embodiment.
FIG. 2 is a block diagram of a non-contact IC card in accordance with the first embodiment.
FIGS. 3A-3C are schematic plan views illustrating loop antennas and a changeover switch of the non-contact IC card in accordance with the first embodiment.
FIGS. 4A-4C illustrate a second exemplary embodiment using the minimum number of loop antennas that can carry out the present invention.
FIGS. 5A-5C illustrate the second embodiment using more than one loop antenna in the present invention.
FIGS. 6A-6C are schematic plan views illustrating loop antennas and a changeover switch of a non-contact IC card in accordance with a third exemplary embodiment.
FIGS. 7A and 7B are schematic plan views illustrating loop antennas and a changeover switch of a non-contact IC card in accordance with a fourth exemplary embodiment.
FIG. 8 illustrates a connecting method utilizing contact between a fixed conductor and a movable conductor in accordance with the fourth embodiment.
FIG. 9 illustrates a connecting method utilizing inductive coupling between the fixed conductor and the movable conductor in accordance with the fourth embodiment.
FIGS. 10A and 10B are schematic plan views illustrating a loop antenna and a changeover switch of a non-contact IC card in accordance with a fifth exemplary embodiment.
FIGS. 11A and 11B are schematic plan views illustrating a loop antenna and a changeover chip of a non-contact IC card in accordance with a sixth exemplary embodiment.
FIG. 12 is a perspective view of an essential part of the changeover switch in accordance with the fifth embodiment.
FIG. 13 is a perspective view of an essential part of another changeover switch in accordance with the fifth embodiment.
FIG. 14 is a sectional view of an essential part of the changeover chip in accordance with the sixth embodiment.
FIG. 15 is a sectional view of an essential part of another changeover chip in accordance with the sixth embodiment.
FIG. 16A is a schematic plan view of a non-contact IC card in accordance with a seventh exemplary embodiment.
FIG. 16B is a schematic sectional view of a part including a changeover switch of the non-contact IC card in accordance with the seventh embodiment.
FIG. 17 is a block diagram of a conventional non-contact IC card.
Exemplary embodiments of the present invention are demonstrated hereinafter with reference to FIGS. 1-16.
FIG. 1 is a block diagram of a non-contact IC card system in accordance with the first exemplary embodiment.
Antenna 2 transmits and receives a radio wave to and from non-contact IC card 3 under the control of reader/writer 1.
FIG. 2 is a block diagram of the non-contact IC card in accordance with the first embodiment.
In FIG. 2, non-contact IC card 3 permits its stored information to be read in non-contact condition. IC chip 4 controls transmission and reception for IC card 3, and loop antenna 5 transmits and receives the radio wave in communication with an external device and in reception of electric power from the external device. IC chip 4 includes modulator circuit 6 for transmitting a modulating signal to loop antenna 5 in transmission of the information, rectification circuit 7, voltage regulator 8, demodulator circuit 9 for demodulating a signal received by loop antenna 5 in reception of information, communication controller 10 for controlling the transmission and reception of the information, and information storage unit 11 for storing the information.
In FIGS. 1 and 2, reader/writer 1 transmits the electric power and the signal simultaneously to non-contact IC card 3 via antenna 2, whereby IC card 3 having no battery is supplied with the electric power and signal. In this way, reader/writer 1 can read the information (e.g. ID) retained in information storage unit 11 of IC card 3 without permission from a holder of IC card 3.
FIGS. 3A-3C are schematic plan views illustrating loop antenna 5 and a changeover switch of non-contact IC card 3 of the present embodiment.
In FIGS. 3A-3C, non-contact IC card 3, IC chip 4 and loop antenna 5 are similar to those in FIG. 2, so that they have the same reference marks, and the descriptions of these elements are omitted.
In the present embodiment, loop antenna 5 is constructed of three loop antennas 5 a, 5 b, 5 c formed of respective loop coils having different loop areas. The respective loop coils of loop antennas 5 a, 5 b, 5 c include respective fixed conductors 5 a′, 5 b′, 5 c′ each fixed to a body of non-contact IC card 3 and shaped to have a gap at a loop part, and movable conductor 5″ removable from the gap of each one of fixed conductors 5 a′, 5 b′, 5 c′.
Movable conductor 5″ of the present embodiment is shared among loop antennas 5 a, 5 b, 5 c. Loop antennas 5 a, 5 b, 5 c are each formed into a circular loop, an elliptical loop, a deformed circular loop or a deformed elliptical loop, and loop antenna 5 a has the largest loop area, while loop antenna 5 c has the smallest loop area. Loop antenna 5 b is disposed in loop antenna 5 a, and loop antenna 5 c is disposed in loop antenna 5 b. These loop antennas 5 a, 5 b, 5 c are connected to one another at a feeding point, and IC chip 4 is disposed at this feeding point. The gaps of loop antennas 5 a, 5 b, 5 c are positioned opposite to the feeding point and have the same width.
Changeover switch 12 selects an antenna for transmission and reception between communication controller 10 and the external device from among loop antennas 5 a, 5 b, 5 c through switching. Movable conductor 5″ moves with changeover switch 12 and can be inserted and removed in and from the gap of each of fixed conductors 5 a′, 5 b′, 5 c′ by switching changeover switch 12. This switch 12 selectively inserts movable conductor 5″ in the gap of the fixed conductor of one of loop antennas 5 a, 5 b, 5 c, thereby connecting movable conductor 5″ to the selected fixed conductor.
As shown in FIGS. 3A-3C, non-contact IC card 3 includes three circular loop antennas 5 a, 5 b, 5 c, so that movable conductor 5″ can be inserted in the gap of the fixed conductor of one of loop antennas 5 a, 5 b, 5 c by moving changeover switch 12. In the loop antenna having movable conductor 5″ inserted, movable conductor 5″ connects both ends of the fixed conductor of this loop antenna in the gap, whereby the loop coil of this antenna forms a perfect loop, enabling the transmission and reception of the radio wave. Here, the other loop coils do not form perfect loops because ends of each of their respective fixed conductors are not coupled to each other at the gap, and consequently, these loop coils do not allow the transmission and reception of the radio wave. In this way, a selection can be made from three types of loop antennas including loop antenna 5 a for long-distance use, loop antenna 5 b for proximity use and loop antenna 5 c for contact use.
In other words, switching changeover switch 12 allows three-stage adjustment of antenna gain, and just switching changeover switch 12 affords formation of a non-contact IC card adapted to long-distance, proximity and contact uses. One non-contact IC card 3 is thus usable both in a non-contact IC card system for long-distance transmission and reception and in a non-contact IC card system requiring transmission and reception in contact condition for high security. For example, in cases where IC card 3 is used in the long-distance non-contact IC card system, movable conductor 5″ is connected to fixed conductor 5 a′ of loop antenna 5 a, which has the largest loop area, by means of changeover switch 12, as shown in FIG. 3A. In cases where IC card 3 is used in the non-contact IC card system requiring proximity use, movable conductor 5″ is connected to fixed conductor 5 b′ of loop antenna 5 b by means of switch 12, as shown in FIG. 3B. In cases where IC card 3 is used in the non-contact IC card system requiring contact use, movable conductor 5″ is connected to fixed conductor 5 c′ of loop antenna 5 c, which has the smallest loop area, by means of switch 12, as shown in FIG. 3C.
As described above, non-contact IC card 3 of the first embodiment allows a user of IC card 3 to select the shape of the loop antenna with ease according to the type (communication distance or the degree of security) of non-contact IC card system in response to a question sent from reader/writer 1, thereby securing the communication distance suitable for the non-contact IC card system. Thus, non-contact IC card 3 is usable both in the non-contact IC card system enabling long-distance communication and in the non-contact IC card system, such as a financial system, which normally requires contact use for high security. In other words, this non-contact IC card 3 has the function of protecting personal information as well as allowing the long-distance use.
For example, in cases where a commuter pass and a bank card are incorporated into the same non-contact IC card 3, a connection is made to loop antenna 5 a adapted to long-distance use for the commuter pass which does not require high security but a long communication distance. For the bank card which doest not require the communication distance but high security, a connection is made to loop antenna 5 c adapted to contact use, whereby the communication is limited to the contact mode only. This prevents another reader/writer 1 from stealing the personal data during the use of non-contact IC card 3 (during the exchange of the personal data) in a bank.
Loop antenna 5 of the first exemplary embodiment is feasible when the number of loop antennas is not less than two, and more the number of loop antennas, the finer the adjustment of communication distance. Also, holding changeover switch 12 in a position not connecting with loop antenna 5 allows non-contact IC card 3 not to react completely because of absence of feeding from reader/writer 1.
FIGS. 4A-4C illustrate the second exemplary embodiment using the minimum number of loop antennas that can carry out the present invention.
In FIG. 4C, a movable conductor which moves with the changeover switch is out of contact with fixed conductors, so that no loop antenna is formed. This brings the non-contact IC card to a state in which the card cannot communicate completely, and important data retained in the non-contact IC card can be completely protected when the IC card is not used.
As shown in FIGS. 5A-5C, when the number of fixed conductors of different loop diameters is N turns (N≧2), N−1 switchings of the distance are possible in reception, and the more N is increased, the more the number of switchings of the distance in reception can be increased.
Loop antenna 5 of the first exemplary embodiment has been circular. However, the present invention is feasible even with a loop antenna such as a square antenna.
FIGS. 6A-6C are schematic plan views illustrating loop antennas and a changeover switch of a non-contact IC card in accordance with the third exemplary embodiment.
In FIGS. 6A-6C, non-contact IC card 3, loop antennas 5, 6 a, 5 b, 5 c, fixed conductors 5 a′, 5 b′, 5 c′, movable conductor 5″ and changeover switch 12 are similar to those in FIG. 3, so that they have the same reference marks, and the descriptions of these elements are omitted.
In the present embodiment, square loop antennas 5 a, 5 b, 5 c are held by non-contact IC card 3, demonstrating that not only the circular loop antenna but also the square loop antenna can switch the distance among contact, proximate and long-distance modes in transmission and reception.
FIGS. 7A and 7B are schematic plan views illustrating loop antennas and a changeover switch of a non-contact IC card in accordance with the fourth exemplary embodiment. The non-contact IC card of the present embodiment is similar in structure to that illustrated by FIG. 2.
In FIGS. 7A and 7B, non-contact IC card 3, IC chip 4 and loop antenna 5 are similar to those in FIG. 2, so that they have the same reference marks, and the descriptions of these elements are omitted.
In this embodiment, loop antenna 5 is square and is constructed of inverted U-shaped fixed conductor 5 d, U-shaped fixed conductor 5 e disposed opposite to a side of fixed conductor 5 d that has a gap, and movable conductors 5 f, 5 g, 5 h slidable between fixed conductors 5 d, 5 e. Two parallel sides of fixed conductor 5 d have the same spacing as two parallel sides of fixed conductor 5 e, and fixed conductors 5 d, 5 e are disposed away from each other.
The two parallel sides of fixed conductor 5 e are disposed on respective lines extending from the respective two parallel sides of fixed conductor 5 d. Changeover switch 12 is formed of a slide switch disposed between fixed conductors 5 d, 5 e. A feeding point of loop antenna 5 is disposed at a point of fixed conductor 5 d, and IC chip 4 is disposed at this feeding point.
Movable conductor 5 f is U-shaped, and two parallel sides of this movable conductor 5 f have the same spacing as the two parallel sides of fixed conductor 5 d and are shorter than the spacing between fixed conductors 5 d, 5 e. Movable conductors 5 g, 5 h are straight and parallel to each other and have the same spacing as the two parallel sides of each of fixed conductors 5 d, 5 e. Also, these conductors 5 g, 5 h each have the same length as the spacing between fixed conductors 5 d, 5 e. Movable conductors 5 f, 5 g, 5 h move with changeover switch 12 in a linear direction perpendicular to the two parallel sides of each one of fixed conductors 5 d, 5 e. The two parallel sides of movable conductor 5 f are out of alignment with movable conductors 5 g, 5 h, respectively. Movable conductor 5 f connects with fixed conductor 5 d at a point in its moving range, thereby forming one square loop in cooperation with fixed conductor 5 d (see FIG. 7A).
Movable conductors 5 g, 5 h connect with both fixed conductors 5 d, 5 e at a point in their moving range, thereby forming one square loop in cooperation with fixed conductors 5 d, 5 e (see FIG. 7B). The square loop formed by fixed conductors 5 d, 5 e and movable conductors 5 g, 5 h has a larger loop area than the square loop formed by fixed conductor 5 d and movable conductor 5 f. A description is provided hereinafter of an operation of the thus-configured non-contact IC card of the fourth embodiment.
Non-contact IC card 3 of the present embodiment too is used in the noncontact IC card system illustrated by FIG. 1. In FIG. 1, reader/writer 1 transmits electric power and a signal simultaneously to IC card 3 via antenna 2. IC card 3 having no battery receives the electric power and the signal by receiving a radio wave transmitted from reader/writer 1 by means of loop antenna 5, while permitting information (e.g. ID) retained in its information storage unit 11 to be read without permission from a holder of this IC card 3.
In communication with a nearby external device, movable conductor 5 f is moved by means of changeover switch 12 for connection to fixed conductor 5 d, as shown in FIG. 7A. Movable conductor 5 f and fixed conductor 5 d thus form a loop antenna, affording transmission and reception of the radio wave. Since this loop antenna formed is small in area, the radio wave can be transmitted and received only from a short distance and not from a great distance.
In communication with a remote external device, movable conductors 5 g, 5 h are moved by means of changeover switch 12 for connection to fixed conductors 5 d, 5 e, as shown in FIG. 7B. Movable conductors 5 g, 5 h and fixed conductors 5 d, 5 e thus form a loop antenna, affording transmission and reception of the radio wave. In this case, the loop antenna is large in area, so that the radio wave can be transmitted and received from a great distance.
As described above, changeover switch 12 changes loop antenna gain by changing the shape of the loop antenna, thereby switching communication distance between two modes. Thus, non-contact IC card 3 of the fourth embodiment can be used in a long-distance non-contact IC card system such as an entry and exit system and in a non-contact IC card system, such as a financial system, which requires communication over a short distance for high security. When used at a short distance, this IC card 3 does not permit readout from a great distance.
FIG. 8 illustrates a connecting method utilizing contact between the fixed conductor and the movable conductor.
In FIG. 8, fixed conductor 5′ and movable conductor 5″ of loop antenna 5 have metallic conductor terminals 15 a, 15 b at their respective contact parts. Fixed conductor 5′ and movable conductor 5″ are connected to each other by physical contact between conductor terminal 15 a of fixed conductor 5′ and conductor terminal 15 b of movable conductor 5″, thereby forming loop antenna 5.
FIG. 9 illustrates a connecting method utilizing inductive coupling between the fixed conductor and the movable conductor.
In FIG. 9, fixed conductor 5′ and movable conductor 5″ of loop antenna 5 are coupled to each other at a high frequency by inductive coupling (electromagnetic coupling), thereby forming loop antenna 5.
FIGS. 10A and 10B are schematic plan views illustrating a loop antenna and a changeover switch of a non-contact IC card in accordance with the fifth exemplary embodiment.
In FIGS. 10A and 10B, non-contact IC card 3, IC chip 4 and loop antenna 5 are similar to those in FIG. 2, so that they have the same reference marks, and the descriptions of these elements are omitted.
In the present embodiment, a loop coil of loop antenna 5 is constructed of fixed conductor 5′, which is fixed to a body of non-contact IC card 3 and shaped to have a gap at a loop part, and movable conductor 5″ removable from the gap of fixed conductor 5′. Loop antenna 5 is formed into a circular loop, an elliptical loop, a deformed circular loop or a deformed elliptical loop. IC chip 4 is disposed at a feeding point of loop antenna 5, and the gap of antenna 5 is positioned opposite to the feeding point.
Changeover switch 12 switches loop antenna 5 between a state in which transmission and reception are possible and a state in which the transmission and reception are impossible. In this embodiment, a slide switch is employed as changeover switch 12. Movable conductor 5″ moves with changeover switch 12 and can be inserted and removed in and from the gap of fixed conductor 5′ by switching changeover switch 12. This switch 12 inserts movable conductor 5″ in the gap of fixed conductor 5′ of loop antenna 5, thereby connecting movable conductor 5″ to fixed conductor 5′.
FIG. 12 is a perspective view of an essential part of changeover switch 12 in accordance with the fifth embodiment.
In FIG. 12, fixed conductor 5′ and movable conductor 5″ have metallic conductor terminals 15 a, 15 b at their respective contact parts. Fixed conductor 5′ and movable conductor 5″ are connected to each other by physical contact between conductor terminal 15 a of fixed conductor 5′ and conductor terminal 15 b of movable conductor 5″, thereby forming loop antenna 5.
FIG. 13 is a perspective view of an essential part of another changeover switch 12 in accordance with the present embodiment.
In FIG. 13, fixed conductor 5′ and movable conductor 5″ can be inductively (electromagnetically) coupled to each other in non-contact relation. The inductive coupling between fixed and movable conductors 5′, 5″ causes these fixed and movable conductors 5′, 5″ to couple to each other at a high frequency, whereby loop antenna 5 is formed.
In FIGS. 10A and 10B, when changeover switch 12 is moved so as to insert movable conductor 5″ in the gap of fixed conductor 5′ of loop antenna 5 (this state is hereinafter referred to as “ON state”), movable conductor 5″ connects both ends of fixed conductor 5′ in the gap, whereby the loop coil of loop antenna 5 forms a perfect loop, enabling the transmission and reception of a radio wave.
When changeover switch 12 is moved so as to remove movable conductor 5″ from the gap of fixed conductor 5′, the ends of fixed conductor 5′ of loop antenna 5 are disconnected from each other due to the presence of the gap (this state is hereinafter referred to as “OFF state”). Since the ends of fixed conductor 5′ are not coupled to each other at the gap, the loop coil does not form a perfect loop and hence cannot transmit and receive the radio wave. Non-contact IC card 3 thus cannot transmit and receive the radio wave even when a question is sent from reader/writer 1. In other words, IC card 3 becomes able to refuse to reply to reader/writer 1, whereby personal information stored in this IC card 3 can be protected.
To reject the external device's reading of the personal information retained in non-contact IC card 3 on the basis of intended use, changeover switch 12 is brought to the “OFF state”, as described above, to disconnect loop antenna 5, whereby the supply of electric power to IC chip 4 can be cut off. In this way, non-contact IC card 3 of the fifth embodiment can reject reading of its retained personal information from IC card 3.
FIGS. 11A and 11B are schematic plan views illustrating a loop antenna and a changeover chip of a non-contact IC card in accordance with the sixth exemplary embodiment. The non-contact IC card of the present embodiment is similar in structure to that illustrated by FIG. 2.
In FIGS. 11A and 11B, non-contact IC card 3, IC chip 4 and loop antenna 5 are similar to those in FIGS. 10A and 10B, so that they have the same reference marks, and the descriptions of these elements are omitted.
In the present embodiment, a loop coil of loop antenna 5 is constructed of fixed conductor 5′, which is fixed to a body of non-contact IC card 3 and shaped to have a gap at a loop part, and movable conductor 5″ removable from the gap of fixed conductor 5′.
Loop antenna 5 is formed into a circular loop, an elliptical loop, a deformed circular loop or a deformed elliptical loop. IC chip 4 is disposed at a feeding point of loop antenna 5, and the gap of antenna 5 is positioned opposite to the feeding point.
Changeover chip 14 switches loop antenna 5 between a state in which transmission and reception are possible and a state in which the transmission and reception are impossible. Movable conductor 5″ is fixed to changeover chip 14 and can be inserted and removed in and from the gap of fixed conductor 5′ by inserting and removing chip 14.
FIG. 14 is a sectional view of an essential part of changeover chip 14 in accordance with the sixth embodiment.
In FIG. 14, fixed conductor 5′ and movable conductor 5″ have metallic conductor terminals 15 a, 15 b at their respective contact parts. Fixed and movable conductors 5′, 5″ are connected to each other by physical contact between conductor terminal 15 a of fixed conductor 5′ and conductor terminal 15 b of movable conductor 5″, thereby forming loop antenna 5.
FIG. 15 is a sectional view of an essential part of another changeover chip 14 in accordance with the present embodiment.
In FIG. 15, fixed conductor 5′ and movable conductor 5″ can be inductively (electromagnetically) coupled to each other in non-contact relation. The inductive coupling between fixed and movable conductors 5′, 5″ causes these conductors 5′, 5″ to couple to each other at a high frequency, whereby loop antenna 5 is formed.
In FIGS. 11A and 11B, when changeover chip 14 is inserted in the gap of fixed conductor 5′ thereby to insert movable conductor 5″ in the gap of fixed conductor 5′ of loop antenna 5 (this state is hereinafter referred to as “ON state”), movable conductor 5″ connects both ends of fixed conductor 5′ in the gap, whereby the loop coil of loop antenna 5 forms a perfect loop, enabling the transmission and reception of a radio wave.
When changeover chip 14 is detached thereby to remove movable conductor 5″ from the gap of fixed conductor 5′, the ends of fixed conductor 5′ of loop antenna 5 are disconnected from each other due to the presence of the gap (this state is hereinafter referred to as “OFF state”). Since the ends of fixed conductor 5′ are not coupled to each other at the gap, the loop coil does not form a perfect loop and hence cannot transmit and receive the radio wave. Non-contact IC card 3 thus cannot transmit and receive the radio wave even when a question is sent from reader/writer 1. In other words, IC card 3 becomes able to refuse to reply to reader/writer 1, whereby personal information stored in this IC card 3 can be protected.
To reject the external device's reading of the personal information retained in non-contact IC card 3 on the basis of intended use, changeover chip 14 is detached to switch to the “OFF state”, as described above, for disconnection of loop antenna 5, whereby the supply of electric power to IC chip 4 can be cut off. In this way, non-contact IC card 3 of the sixth embodiment can reject reading of its retained personal information from IC card 3.
FIG. 16A is a schematic plan view of a non-contact IC card in accordance with the seventh exemplary embodiment. The non-contact IC card of the present embodiment is similar in structure to that illustrated by FIG. 2.
In FIG. 16A, non-contact IC card 3, IC chip 4 and loop antenna 5 are similar to those in FIG. 2, so that they have the same reference marks, and the descriptions of these elements are omitted.
In the present embodiment, a loop coil of loop antenna 5 is constructed of fixed conductor 5′, which is fixed to body 16 of non-contact IC card 3 and shaped to have a gap at a loop part, and movable conductor 5″ removable from the gap of fixed conductor 5′.
Changeover switch 12 switches loop antenna 5 between a state in which transmission and reception are possible and a state in which the transmission and reception are impossible. Changeover switch 12 of this embodiment is a push switch.
FIG. 16B is a schematic sectional view of a part including the changeover switch of the non-contact IC card of the present embodiment.
In FIG. 16B, fixed conductor 5′, movable conductor 5″ and body 16 of non-contact IC card 3 are similar to those in FIG. 16A.
Push part 17 of changeover switch 12 is removable from the gap of fixed conductor 5′, and spring 18 energizes push part 17 in a direction that removes push part 17 from the gap of fixed conductor 5′.
Movable conductor 5″ is fixed to a bottom side of push part 17. Spring 18 is disposed between a bottom side of movable conductor 5″ and body 16, whereby push part 17 and movable conductor 5″ are energized in the direction that detaches push part 17 and movable conductor 5″ from body 16.
In FIGS. 16A and 16B, when a user presses push part 17 of changeover switch 12 against body 16, movable conductor 5″ fixed to switch 12 connects with fixed conductor 5′, whereby the loop coil of loop antenna 5 forms a perfect loop, and consequently, loop antenna 5 becomes capable of transmission and reception.
When push part 17 of changeover switch 12 is released from body 16, movable conductor 5″ is removed from the gap of fixed conductor 5′ by resilience of spring 18, whereby the loop coil of loop antenna 5 is disconnected. This prevents loop antenna 5 from receiving a radio wave carrying electric power and a signal from reader/writer 1 and thus prevents others from stealing information stored in non-contact IC card 3 without bringing the user to the realization.
The fifth through seventh embodiments each have referred to circular loop antenna 5. However, antenna 5 may be square.
As described above, the non-contact IC card of the present invention allows the user to select the communication distance with ease according to service the user utilizes by switching the changeover switch.
Moreover, the non-contact IC card allows its user to refuse to transmit the information retained in the IC card in response to a question from the reader/writer for prevention of unsolicited disclosure of the information stored in the IC card.
The non-contact IC card of the present invention includes the information storage unit for storing the information, the communication controller for controlling the communication with the external device and the loop antenna for transmitting and receiving the radio wave to and from the external device. This non-contact IC card further includes a cut-off unit for forcibly cutting off the communication with the external device, and prevents leakage of the data retained by the non-contact IC card according to intended use by forcibly cutting off the communication with the external device by means of the cut-off unit.
Here, the slide switch, the push switch, the detachable changeover chip or the like is employed as the cut-off unit.
In cases where the cut-off unit is the changeover switch which switches the loop antenna between the state in which the transmission and reception are possible and the state in which the transmission and reception are impossible, the changeover switch brings the loop antenna to the state in which the antenna cannot transmit and receive, so that the question or a request from the reader/writer can be rejected with ease according to intended use. Thus, leakage of the data retained by the non-contact IC card is prevented.
In cases where the cut-off unit is the changeover chip detachable from the loop antenna, the loop antenna becomes usable when the changeover chip is mounted to the loop antenna, and the loop antenna becomes impossible to use when the changeover chip is detached from the loop antenna. By detaching the changeover chip according to intended use, transmission of the retained data in response to the question from the reader/writer can be refused. In this way, leakage of the data retained by the non-contact IC card is prevented.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS5198647 *Nov 27, 1990Mar 30, 1993Mitsubishi Denki Kabushiki KaishaPlural-coil non-contact ic card having pot cores and shielding wallsUS5337063 *Apr 13, 1992Aug 9, 1994Mitsubishi Denki Kabushiki KaishaAntenna circuit for non-contact IC card and method of manufacturing the sameUS5585617 *Jul 11, 1995Dec 17, 1996Mitsubishi Denki Kabushiki KaishaNon-contact IC card communicating at multiple frequenciesUS5940043 *Feb 21, 1997Aug 17, 1999Sensormatic Electronics CorporationUnidirectional field antenna for identification systemUS6343744 *Feb 18, 2000Feb 5, 2002Nippon Telegraph And Telephone CorporationNoncontact type IC card and system thereforUS6398116 *Jun 22, 1998Jun 4, 2002Angewandte Digital GmbhChip card with at least two coil devices for transferring data and/or energyUS6424029 *Oct 16, 2000Jul 23, 2002Koninklijke Philips Electronics N.V.Chip cardCA2319993A1Sep 20, 2000Mar 22, 2001Em Microelectronic-Marin SaTransponder intended for several different applicationsDE19645083A1Nov 1, 1996May 7, 1998Austria Card GmbhKontaktlose Chipkarte mit TransponderspuleEP1087332A1Feb 25, 2000Mar 28, 2001EM Microelectronic-Marin SATransponder constructed for several different applicationsJP2000172812A Title not availableJPH10105660A Title not availableJPH10312445A Title not availableWO1998020450A1Oct 30, 1997May 14, 1998Austria Card GmbhContactless smart card with a transponder coilWO2001043064A2Dec 7, 1999Jun 14, 2001Infineon Technologies AgGoods labelWO2001084492A1May 3, 2001Nov 8, 2001Schlumberger SystemesIntegrated circuit card and case therefor* Cited by examinerNon-Patent CitationsReference1Partial International Search Report for PCT/JP02/12429, dated Apr. 2, 2003.2Supplemental International Search Report for Application No. PCT/JP02/12429 mailed Jun. 20, 2003.Referenced byCiting PatentFiling datePublication dateApplicantTitleUS6991175 *Jan 3, 2005Jan 31, 2006Sheng-Chang HuangLabel to be attached on a plastic product formed in a mold and identifiable by a detecting deviceUS7057562 *Mar 11, 2004Jun 6, 2006Avery Dennison CorporationRFID device with patterned antenna, and method of makingUS7100835 *Aug 23, 2003Sep 5, 2006Massachusetts Institute Of TechnologyMethods and apparatus for wireless RFID cardholder signature and data entryUS7156301 *Mar 3, 2005Jan 2, 2007American Express Travel Related Services Company, Inc.Foldable non-traditionally-sized RF transaction card system and methodUS7212124 *Jun 26, 2003May 1, 2007Hitachi, Ltd.Portable information deviceUS7337966 *Mar 30, 2005Mar 4, 2008Infineon Technologies AgTransmission interfaceUS7423539Aug 26, 2005Sep 9, 2008Impinj, Inc.RFID tags combining signals received from multiple RF portsUS7458513 *Jul 31, 2006Dec 2, 2008Fujitsu Frontech LimitedIC card reading apparatus and its related methodUS7525438May 15, 2007Apr 28, 2009Impinj, Inc.RFID tags combining signals received from multiple RF portsUS7528728Aug 26, 2005May 5, 2009Impinj Inc.Circuits for RFID tags with multiple non-independently driven RF portsUS7540427 *May 14, 2003Jun 2, 2009Lintec CorporationIC tagUS7650314Nov 30, 2005Jan 19, 2010American Express Travel Related Services Company, Inc.System and method for securing a recurrent billing transactionUS7667589Jul 14, 2004Feb 23, 2010Impinj, Inc.RFID tag uncoupling one of its antenna ports and methodsUS7668750Mar 10, 2004Feb 23, 2010David S BonalleSecuring RF transactions using a transactions counterUS7690577Sep 20, 2007Apr 6, 2010Blayn W BeenauRegistering a biometric for radio frequency transactionsUS7746215Nov 4, 2005Jun 29, 2010Fred BishopRF transactions using a wireless reader gridUS7757959 *Dec 6, 2007Jul 20, 2010Korea Advanced Institute Of Science And TechnologySystem-in-package having reduced influence between conductor and antenna and method of designing the sameUS7793845Aug 3, 2009Sep 14, 2010American Express Travel Related Services Company, Inc.Smartcard transaction system and methodUS7814332Sep 6, 2007Oct 12, 2010Blayn W BeenauVoiceprint biometrics on a payment deviceUS7837116Jul 17, 2007Nov 23, 2010American Express Travel Related Services Company, Inc.Transaction cardUS7838993May 26, 2006Nov 23, 2010Semiconductor Energy Laboratory Co., Ltd.Semiconductor deviceUS7886157Jan 25, 2008Feb 8, 2011Xatra Fund Mx, LlcHand geometry recognition biometrics on a fobUS7889052Jan 10, 2003Feb 15, 2011Xatra Fund Mx, LlcAuthorizing payment subsequent to RF transactionsUS7988038Sep 6, 2007Aug 2, 2011Xatra Fund Mx, LlcSystem for biometric security using a fobUS8001054Jan 4, 2006Aug 16, 2011American Express Travel Related Services Company, Inc.System and method for generating an unpredictable number using a seeded algorithmUS8016191Aug 9, 2010Sep 13, 2011American Express Travel Related Services Company, Inc.Smartcard transaction system and methodUS8068012Jan 8, 2009Nov 29, 2011Intelleflex CorporationRFID device and system for setting a level on an electronic deviceUS8074889Sep 6, 2007Dec 13, 2011Xatra Fund Mx, LlcSystem for biometric security using a fobUS8191788Oct 19, 2010Jun 5, 2012American Express Travel Related Services Company, Inc.Transaction cardUS8227851Nov 23, 2010Jul 24, 2012Semiconductor Energy Laboratory Co., Ltd.Semiconductor deviceUS8279042Sep 20, 2007Oct 2, 2012Xatra Fund Mx, LlcIris scan biometrics on a payment deviceUS8284025Sep 20, 2007Oct 9, 2012Xatra Fund Mx, LlcMethod and system for auditory recognition biometrics on a FOBUS8288893 *Jul 17, 2009Oct 16, 2012Qualcomm IncorporatedAdaptive matching and tuning of HF wireless power transmit antennaUS8289136Sep 20, 2007Oct 16, 2012Xatra Fund Mx, LlcHand geometry biometrics on a payment deviceUS8294552Sep 6, 2007Oct 23, 2012Xatra Fund Mx, LlcFacial scan biometrics on a payment deviceUS8496183 *Feb 6, 2009Jul 30, 2013Taiyo, Inc.Non-contact IC card communication controller and non-contact IC card holderUS8505826Apr 16, 2007Aug 13, 2013Visa U.S.A.Anti-interrogation for portable deviceUS8548927Mar 26, 2004Oct 1, 2013Xatra Fund Mx, LlcBiometric registration for facilitating an RF transactionUS8763915 *Feb 1, 2012Jul 1, 2014Eyes Open CorporationIdentification plate with adjustable dampingUS8818907Dec 14, 2004Aug 26, 2014Xatra Fund Mx, LlcLimiting access to account information during a radio frequency transactionUS8872619May 3, 2007Oct 28, 2014Xatra Fund Mx, LlcSecuring a transaction between a transponder and a readerUS9024719Oct 15, 2004May 5, 2015Xatra Fund Mx, LlcRF transaction system and method for storing user personal dataUS9031880Oct 25, 2006May 12, 2015Iii Holdings 1, LlcSystems and methods for non-traditional payment using biometric dataUS9336634Sep 21, 2012May 10, 2016Chartoleaux Kg Limited Liability CompanyHand geometry biometrics on a payment deviceUS9454752Dec 13, 2002Sep 27, 2016Chartoleaux Kg Limited Liability CompanyReload protocol at a transaction processing entityUS20040124248 *Aug 23, 2003Jul 1, 2004Massachusetts Institute Of TechnologyMethods and apparatus for wireless RFID cardholder signature and data entryUS20040140896 *Jun 26, 2003Jul 22, 2004Takehiro OhkawaPortable information deviceUS20050200539 *Mar 11, 2004Sep 15, 2005Forster Ian J.RFID device with patterned antenna, and method of makingUS20050224588 *Mar 30, 2005Oct 13, 2005Infineon Technologies AgTransmission interfaceUS20060049917 *Aug 26, 2005Mar 9, 2006Impinj, Inc.RFID tags combining signals received from multiple RF portsUS20060273179 *May 14, 2003Dec 7, 2006Masateru YamakageIc tagUS20070012786 *Jul 16, 2004Jan 18, 2007Honda Motor Co., Ltd.Ic card and information storage/transmitterUS20070029387 *Jul 31, 2006Feb 8, 2007Toshiaki IbiIC card reading apparatus and its related methodUS20080149736 *Dec 6, 2007Jun 26, 2008Korea Advanced Institute Of Science And TechnologySystem-in-package having reduced influence between conductor and antenna and method of designing the sameUS20090102055 *May 26, 2006Apr 23, 2009Semiconductor Energy Laboratory CoSemiconductor deviceUS20100117454 *Jul 17, 2009May 13, 2010Qualcomm IncorporatedAdaptive matching and tuning of hf wireless power transmit antennaUS20100171598 *Jan 8, 2009Jul 8, 2010Peter Arnold MehringRfid device and system for setting a level on an electronic deviceUS20100230309 *Feb 6, 2009Sep 16, 2010Taiyo Inc.Non-Contact IC Card Communication Controller and Non-Contact IC Card HolderUS20110068385 *Nov 23, 2010Mar 24, 2011Semiconductor Energy Laboratory Co., Ltd.Semiconductor deviceUS20130026237 *Feb 1, 2012Jan 31, 2013Anatoli StobbeIdentification plate with adjustable dampingUSRE43157Jan 31, 2008Feb 7, 2012Xatra Fund Mx, LlcSystem and method for reassociating an account number to another transaction accountUSRE45416Jun 15, 2012Mar 17, 2015Xatra Fund Mx, LlcProcessing an RF transaction using a routing numberCN103647156B *Jul 17, 2009Oct 14, 2015高通股份有限公司高频无线功率发射天线的自适应匹配和调谐* Cited by examinerClassifications U.S. Classification235/492, 343/741, 343/866, 343/867, 343/895, 343/804, 343/870International ClassificationG06K19/07, G06K19/077, G06K19/073Cooperative ClassificationG06K19/07769, G06K19/07767, G06K19/07784, G06K19/0716, G06K19/07749, G06K19/0723, G06K19/07345, G06K19/07779, G06K19/07783, G06K19/0724European ClassificationG06K19/07E, G06K19/077T4A, G06K19/07T2, G06K19/077T4C, G06K19/077T7C1, G06K19/077T7C3, G06K19/077T7C1C, G06K19/077T, G06K19/07T, G06K19/073A4Legal EventsDateCodeEventDescriptionFeb 21, 2003ASAssignmentOwner name: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD., JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TANAKA, MASAHIKO;REEL/FRAME:013775/0125Effective date: 20030120May 30, 2008FPAYFee paymentYear of fee payment: 4Jul 30, 2012REMIMaintenance fee reminder mailedDec 14, 2012LAPSLapse for failure to pay maintenance feesFeb 5, 2013FPExpired due to failure to pay maintenance feeEffective date: 20121214RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent 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