JP2005354500A - Radio type data carrier system provided with portable receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio type data carrier system where a sufficient sensitivity can be obtained regardless of a long distance between a transmitter as well as a portable receiver and the responder is small-sized and signal processing is possible, even if there are a plurality of responses to one inquiry. <P>SOLUTION: The radio type data carrier system has a transmitter 10, having a transmission antenna 13 and a portable receiver 30 which is arranged in a magnetic field area of the transmission antenna 13 and has a receiving antenna 31, and a responder 2 having a resonance circuit of a radio waves oscillated by the transmission antenna 13 and a switch circuit for giving a load modulation signal to the resonance circuit, corresponding to data held in itself passes or is arranged on the way from the transmission antenna 13 to the reception antenna 31, which is in the magnetic field region. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a data carrier system that can read data of a responder (data carrier) with a portable receiver by wireless communication from a transmitter.

  Interrogator / responder (reader / writer) for entry / exit management of specific rooms, ski lift tickets, train tickets, parking entry / exit management, highway traffic tickets, electronic money, shoplifting prevention, etc. / Data carrier) system is used. The interrogator and the responder are connected by wireless communication. The interrogator is a fixed installation type connected to the host computer by wire or wireless, and reads data from the responder based on the instruction and writes data to the responder. The responder has a card shape, a coin shape, or a box shape, and is carried by a person or attached to a product or a car to move.

  An example of a conventional wireless data carrier system is shown in Patent Document 1. As shown in FIG. 1, the interrogator 1 is composed of a handy terminal 15 driven by a battery and an antenna coil 10 and is portable. Similarly, as shown in FIG. 2 of Patent Document 1, communication is performed by coupling the antenna coil 10 of the interrogator 1 and the coil of the responder 2, that is, by placing the coil of the responder 2 in the magnetic field of the coil of the interrogator 1. Is to do.

  Since such a wireless data carrier system is portable, the size of the antenna coil is naturally limited. Even if an external antenna is attached, the size is limited. For this reason, the magnetic field is inevitably small and a communication distance cannot be obtained. In addition, because it is portable, the drive power source must rely on a small battery. If the interferometer output is increased to increase the magnetic field (longer communication distance), the battery will be consumed more and the usable time will be shorter. End up.

JP 2003-6585 A

  A conventional wireless data carrier system having a portable interrogator has a short communication distance, so that there is a drawback that a response cannot be obtained from the interrogator even if the transponder is slightly away from the interrogator. The present invention provides a wireless data carrier system that eliminates such drawbacks and that provides sufficient sensitivity even when the distance from the responder is long.

  The invention according to claim 1, which has been made to achieve the above object, includes a fixed or semi-fixed transmitter having a transmission antenna that oscillates radio waves of question data, and radio waves of the query data. A resonant circuit, a responder having a switch circuit that applies a load modulation signal to the resonant circuit corresponding to the response data held by itself, and a portable receiver that receives the interrogation data radio wave A wireless data carrier system, characterized in that the transponder is located nearer to the transmitting antenna than the portable receiver in the magnetic field field region of the transmitting antenna. is there.

  The interrogation data radio wave oscillated from the transmitting antenna of the transmitter generates an induced current in the resonance circuit of the responder in the magnetic field field region. At this time, the switch circuit is turned on / off corresponding to the data, and the load of the induced current fluctuates, which is received by the portable receiver.

  The relative positional relationship between the transmission antenna and the portable receiver does not necessarily have to face each other, and may be on the same plane. In short, it is only necessary to have a transponder on the way from the transmitting antenna to the portable receiver in the magnetic field field region of the transmitting antenna.

  The data held by itself is data stored in the read / write memory or read-only memory of the responder.

  Similarly, the invention according to claim 2 is the wireless data carrier system according to claim 1, wherein the portable receiver holds a battery power source.

  The invention according to claim 3 is the wireless data carrier system according to claim 1, wherein the responder is a passive circuit.

  The invention according to claim 4 is the wireless data carrier system according to claim 1, wherein a plurality of the responders are simultaneously passed through or arranged in the magnetic field field region of the transmitting antenna. The plurality of responders may all hold the same data, or may hold different data.

  The invention according to claim 5 is the wireless data carrier system according to claim 1, wherein the transmitter has a plurality of portable receivers for one. That is, the receiving antennas of a plurality of portable receivers are arranged in the magnetic field field region of the transmitting antenna of the transmitter.

  The wireless data carrier system according to claim 1, wherein the transmitter has a plurality of the responders and a plurality of the portable receivers. It is. The number of responders and portable receivers may be the same or different.

  According to the wireless data carrier system of the present invention, the transmitter and the receiver are separated, the transmitter is fixed or semi-fixed, and the receiver is portable. Since the oscillation output from the transmitter can be greatly increased by using it, the magnetic field field becomes longer, and reception is possible even if the receiver is at a remote position. That is, even if the distance between the transmitter / responder / portable receiver is long, an accurate response is received by the portable receiver with a high S / N ratio.

  With this wireless data carrier system, it has become possible to realize long-distance communication up to a responder, which could only be realized with a wireless data carrier system having a stationary interrogator, with a portable device.

  The best mode for carrying out the present invention will be described below in detail with reference to the drawings, but the scope of the present invention is not limited to this form.

  FIG. 1 is a schematic diagram showing the overall configuration of a wireless data carrier system to which the present invention is applied. The transmitter 10 is a fixed installation type, and the responder 2 and the portable receiver 30 are arranged in the magnetic field field region 12 of the transmission antenna 13. The stationary transmitter 10 is connected to a commercial power source. The responder 2 is arranged in the middle of the magnetic field reaching the portable receiver 30 from the transmission antenna 13. The transmitter 10 and the portable receiver 30 may be connected to a host computer (not shown).

  FIG. 2 is a block circuit diagram showing a main part of an example of the fixed installation type transmitter 10 used in the wireless data carrier system shown in FIG. In the transmitter 10, 13 is an antenna, 14 is an amplification unit, 15 is a modulation unit, 16 is an oscillation unit, and 17 is a control circuit CC. The oscillation unit 16 has a crystal oscillator and an amplifier, and oscillates a carrier wave. The modulation unit 15 has a three-state logic circuit, and inputs the signal from the terminal MOD to the signal of the 100% modulation instruction terminal 100/10 # from the control circuit 17 or the signal of the 10% modulation instruction terminal 10/100 #. Superimpose and output the data. The modulated wave in which the interrogation data of 100% modulation or the interrogation data of 10% modulation is superimposed on the carrier wave by the AND circuit is amplified by the amplifying unit 14 and oscillated from the antenna 13 as a multiple modulation carrier wave. Such an operation is performed with driving power supplied from a commercial power source.

  FIG. 3 is a block diagram showing a configuration of the responder 2 of the wireless data carrier system shown in FIG. In the responder 2, 21 is an antenna coil, and 22 is a capacitor to form an LC resonance circuit. Reference numeral 23 is a switch circuit, 24 is a signal generation circuit, 25 is a memory circuit, and 26 is a passive power supply circuit.

  FIG. 4 is a block circuit diagram showing a main part of an example of the portable receiver 30 used in the wireless data carrier system shown in FIG. In the portable receiver 30, 31 is an antenna, 32 is an impedance (IP) conversion unit, 33 is a detection unit, 34 is an amplification unit, 35 is a demodulation circuit unit QUAD, 36 is a binarization circuit unit, and 37 is a control circuit C. .C., 38 is a power battery. The multi-modulated carrier wave received by the antenna 31 is converted from the impedance of the antenna to the input impedance by the impedance converter 32 made of an LC circuit. This multiple modulated carrier wave is detected by the diode of the detector 33, the main carrier wave (carrier wave) is removed, and the subcarrier wave is extracted. This is amplified by the amplifying unit 34, frequency-detected by the demodulating circuit unit 35, and the subcarrier is smoothed and removed. This is decoded into a binarized signal by the binarizing circuit unit 36 and input to the control circuit 37.

  The operation of the wireless data carrier system shown in FIGS. 1, 2, 3, and 4 will be described with reference to the time chart shown in FIG.

  The interrogation data from the control circuit 17 of the fixed installation type transmitter 10 is modulated by the modulation unit 15 to the oscillation frequency of the oscillation unit 16, and the waveform shown in FIG. Form. The radio wave is received by the antenna 31 through the responder 2 in the magnetic field 12 region.

  On the other hand, the responder 2 generates an induced current in the antenna coil 21 due to induction by radio waves from the antenna 13, and is operated by the passive power supply circuit 26 by the current. Corresponding to the response data shown in FIG. 5B read by the signal generating circuit 24, the switch circuit 23 is turned on and off, and the load of the antenna coil 21 is changed (see the dotted line in FIG. 5C). Fluctuates. Therefore, the response data is superimposed on the waveform received by the receiving antenna 31 due to the change in the magnetic field as shown by the solid line in FIG.

  This waveform (C) is received by the antenna 31 of the portable receiver 30 and subjected to a series of circuit processing such as detection demodulation and the like, and enters the control circuit 37 as reception data corresponding to the response data (see (B)). This received data is compared with the question data of the control circuit 17 by the control circuit 37, and the suitability as response data is evaluated. Alternatively, the comparison is made by a host computer to which the control circuit 17 and the control circuit 37 are connected.

  In the above-described embodiment, one responder 2 is used for a pair of fixed installation transmitter 10 and portable receiver 30, but a plurality of portable receivers 30 or Multiple responders may be used. The embodiment of FIG. 6 is an example in which two responders 2 are used for a pair of fixed installation transmitter 10 and portable receiver 30. Two or more responders 2 may be used. The embodiment of FIG. 7 is an example in which one responder 2 is used for one fixed installation transmitter 10 and two portable receivers 30. Two or more portable receivers 30 may be provided. Two or more responders 2 may be used.

  The embodiment of FIG. 8 is an example in which one responder 2 is used for one fixed installation transmitter 10 and two portable receivers 30. Two or more portable receivers 30 may be provided.

  In these figures, the fixed installation type transmitter and the portable receiver are drawn facing each other. However, such an arrangement is not necessarily required. In the magnetic field field region, for example, as shown in FIG. Alternatively, the configuration may be arranged in parallel. In short, the portable receiver 30 can be used in the magnetic field field where the stationary transmitter 10 oscillates, and the responder 2 can be used if the responder 2 is in the middle of the magnetic field between the fixed transmitter 10 and the portable receiver 30.

  FIG. 10 shows an example in which the wireless data carrier system of the present invention is applied to article management in a cleaning shop. When a laundry is stored by a customer at a cleaning store, customer data, data such as the type of laundry, how to wash, etc. are written in the IC of the responder and attached to the laundry. Then, the laundry 50 carried to the factory is placed in front of the transmission antenna 13 of the stationary transmitter 10, and the portable receiver 30 stores data such as the type of laundry of the responder 2 and how to wash. It is read and sorted into laundry-type lines. After the laundry is finished, the laundry 50 carried from the factory to the store is read by the customer data of the responder 2 by the fixed installation transmitter 10 and the portable receiver 30 installed in the store, and is sorted by customer.

  As a similar example, it can also be used for article management at apparel logistics sites. In addition to this, it can be used in many fields such as logistics management of various products, cargo management in the transportation industry, library management system in the library.

  An embodiment in which a fixed installation type transmitter and a portable receiver of the wireless data carrier system of the present invention have been prototyped and performance evaluations will be described below.

  The fixed installation transmitter 10 and the portable receiver 30 shown in FIG. 1 are configured so that the transmission antenna 13 of the fixed installation transmitter 10 is 450 × 300 mm and the reception antenna 31 of the portable receiver 30 is a rectangle of 60 × 40 mm. Prototyped. A carrier wave was transmitted from the stationary transmitter 10 with a transmission power of 1 W and received by the transmitter 10. As a result, communication was possible even when the communication distance between the antenna 13 and the antenna 31 was 40 cm or more.

  On the other hand, in the conventional wireless data carrier system disclosed in Patent Document 1, the antenna is 60 × 40 mm in the handy terminal (transmission / reception integrated interrogator), and the power is 100 mW, which is a practical battery-powered output. Was a few centimeters.

  From this comparison, it can be seen that the fixed field transmitter 10 and the portable receiver 30 that were prototyped in the embodiment of the present invention have a significantly longer magnetic field field than the conventional interrogator.

1 is a schematic diagram showing the overall configuration of a wireless data carrier system to which the present invention is applied.

It is a block circuit diagram which shows one Embodiment of the transmitter used for the wireless data carrier system to which this invention is applied.

It is a block circuit diagram which shows one Embodiment of the responder used for the radio | wireless data carrier system to which this invention is applied.

It is a block circuit diagram which shows one Embodiment of the receiver used for the wireless data carrier system to which this invention is applied.

It is a time chart figure of the said embodiment of the radio | wireless data carrier system to which this invention is applied.

It is a block circuit diagram which shows another embodiment different from the said embodiment of the radio | wireless data carrier system to which this invention is applied.

It is a block circuit diagram which shows another embodiment different from the said embodiment of the radio | wireless data carrier system to which this invention is applied.

It is a block circuit diagram which shows another embodiment different from the said embodiment of the radio | wireless data carrier system to which this invention is applied.

It is a block circuit diagram which shows another embodiment different from the said embodiment of the radio | wireless data carrier system to which this invention is applied.

It is the schematic which showed an example of the use condition of the radio | wireless data carrier system to which this invention is applied.

Explanation of symbols

  2 is a transponder, 10 is a transmitter, 12 is a magnetic field, 13 is an antenna, 14 is an amplifier, 15 is a modulator, 16 is an oscillator, 17 is a control circuit, 21 is a coil, 22 is a capacitor, and 23 is a switch Circuit, 24 is a signal generation circuit, 25 is a memory circuit, 26 is a passive power supply circuit, 30 is a portable receiver, 31 is an antenna, 32 is an impedance (IP) converter, 33 is a detector, 34 is an amplifier, 35 Is a demodulating circuit unit QUAD, 36 is a binarizing circuit unit, 37 is a control circuit, 38 is a power battery, and 50 is a laundry.

Claims (6)

Fixed or semi-fixed transmitter having a transmission antenna that oscillates the interrogation data radio wave, the interrogation data radio wave resonance circuit, and the resonance modulation circuit corresponding to the response data held by itself And a portable receiver that receives the radio wave of the interrogation data, the magnetic field field region of the transmitting antenna, the responder being more than the portable receiver A wireless data carrier system, wherein the wireless data carrier system is arranged so as to pass through or be close to a transmitting antenna. 2. The wireless data carrier system according to claim 1, wherein the portable receiver holds a battery power source. 2. The wireless data carrier system according to claim 1, wherein the responder is a passive circuit. The wireless data carrier system according to claim 1, wherein the plurality of transponders simultaneously pass through or are arranged in the magnetic field field region of the transmitting antenna. The wireless data carrier system according to claim 1, wherein the transmitter has a plurality of the portable receivers for one. The wireless data carrier system according to claim 1, wherein the transmitter has a plurality of the responders and a plurality of the portable receivers for one.

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