JP5060903B2 - Non-contact reader / writer device - Google Patents

Description

  The present invention relates to a non-contact reader / writer device, and more specifically, when a non-contact IC card reader / writer is not used, the power is turned off and the non-contact IC card reader / writer holds the non-contact IC card or the non-contact IC card. The present invention relates to a non-contact reader / writer device including a microwave sensor using a Doppler effect that turns on the power of a non-contact IC card reader / writer when it is detected that the hand is held over.

In recent years, non-contact IC cards have been widely used due to the characteristics of simple and quick reading and the ease of maintenance of non-contact IC card reader / writers which are readers. For example, it is adopted as a gate pass for transportation facilities and an entrance pass to a specific facility.
However, since the non-contact IC card reader / writer installed at the gate constantly generates a magnetic field in order to operate the non-contact IC card, there is a problem that wasteful power is consumed.

  Therefore, for the purpose of reducing power consumption during standby of the non-contact IC card reader / writer, a magnetic member such as a permanent magnet is embedded in the non-contact IC card, and detection is performed when the non-contact IC card reader / writer reads. When the unit detects a DC magnetic field generated by the permanent magnet, the reed switch of the magnetic detecting unit responds to turn on the reed switch in the reader / writer, and the radio unit is controlled to generate an oscillating magnetic field. Accordingly, there is an advantage that power is not supplied unless an IC card including a magnetic member approaches, and wasteful power is suppressed.

  In addition, a microwave sensor using the Doppler effect has been often used for detecting an object. The principle of this sensor is that a radio wave is emitted from the sensor, and the radio wave reflected by the object and the emitted radio wave are mixed. At this time, when the object approaches or moves away from the sensor, the reflected radio wave undergoes Doppler shift and the frequency changes. Therefore, when the emitted radio wave and the reflected radio wave are mixed, the difference between the frequencies is extracted as a beat signal.

JP 2001-243432 A

  However, in the non-contact IC card reader / writer described in the prior art, particularly in the non-contact IC card reader / writer mounted on the vehicle, power is supplied using the battery of the vehicle, so the engine of the vehicle is stopped. Even during standby, power consumption of 500 mW or more is consumed even during standby, and the battery charging voltage is consumed.

  Therefore, if the magnetic member described in the prior art is embedded in the IC card, the power to the contactless IC card reader / writer mounted in the vehicle is turned on by holding the IC card from the outside of the vehicle. However, since it is necessary to embed a magnet in each non-contact IC card, there is a problem that the manufacturing cost of the IC card increases.

  Therefore, when the non-contact IC card reader / writer mounted on the vehicle is not in use, the power is turned off, and when the user approaches the vehicle and actually uses the non-contact IC card reader / writer, There is a problem that must be solved in a device that can supply power to a non-contact IC card reader / writer mounted on the PC.

  In order to solve the above problems, a non-contact reader / writer device according to the present invention is configured as follows.

(1) A non-contact reader / writer device is a non-contact reader / writer device including a non-contact IC card reader / writer having an antenna that radiates radio waves to a non-contact IC card. A microwave sensor using a Doppler effect is installed at a position near the position where the contactless IC card can be detected and held, and the microwave sensor is the contactless IC card reader / writer. When the non-contact IC card held over is detected , a switch for automatically supplying power to the non-contact IC card reader / writer is controlled to be turned on .
(2) A non-contact reader / writer device is a non-contact reader / writer device including a non-contact IC card reader / writer mounted on a vehicle and supplied with power supplied to the vehicle. A microwave sensor using a Doppler effect is installed at a position where the reader / writer is installed and can be detected by holding the non-contact IC card, and the microwave sensor is used for the non-contact IC card. When the contactless IC card held over the reader / writer is detected , a switch for automatically supplying power to the contactless IC card reader / writer is controlled to be turned on .

  As described above, the non-contact reader / writer device according to the present invention has the microwave sensor using the Doppler effect installed in the vicinity of the non-contact IC card reader / writer, and the non-contact IC card reader using the microwave sensor. When a non-contact IC card held by the writer or a hand holding the non-contact IC card is detected, power is supplied to the non-contact IC card reader / writer so that the non-contact IC card reader / writer is not in use. The power is turned off and the power is turned on only when in use. Therefore, unnecessary power consumption when the non-contact IC card reader / writer is not used can be suppressed.

  In addition, a non-contact IC card or a non-contact IC card that is placed near a non-contact IC card reader / writer mounted on a vehicle with a microwave sensor using the Doppler effect is placed over the non-contact IC card reader / writer with the microwave sensor. By supplying power to the contactless IC card reader / writer when a holding hand is detected, the power is turned off when the contactless IC card reader / writer is not used, and the power is turned on only when used. . Therefore, useless power consumption when the non-contact IC card reader / writer is not used is suppressed, and in particular, consumption of the vehicle battery can be prevented.

  Next, an embodiment of a non-contact reader / writer device according to the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the non-contact reader / writer device 11 according to the present invention supplies power from a non-contact IC card reader / writer 12 mounted on a vehicle as a moving body and a battery 13 of the vehicle to a non-contact IC card reader. A power control switch 14 to be supplied to the writer 12, a non-contact IC card 17 outside the vehicle or a Doppler sensor module 16 which is a microwave sensor for detecting the approach of a hand holding the non-contact IC card 17, and a non-contact An IC card 17 is generally used.

  In general, the non-contact IC card reader / writer 12 often uses a DC power supply of about 5V to 12V, and power consumption differs between communication and standby, but power of 500 mW or more is required even during standby. Therefore, for example, when mounted on a vehicle, standby power is consumed all day, and power consumption that cannot be ignored is consumed for the finite battery 13.

  Therefore, in the present invention, in the non-contact type IC card reader / writer 12 mounted on the vehicle, when not in use, that is, other than performing an act of holding the non-contact IC card 17 held by hand from outside the vehicle. If the power from the battery 13 supplied to the non-contact type IC card reader / writer 12 is cut off, the power consumption when not in use is close to zero. And by using the microwave sensor using the Doppler effect for the control of detecting the approach of the non-contact IC card 17 held by hand and supplying power, the power consumption can be extremely reduced. Even if installed, the battery 13 is not affected at all.

  The non-contact IC card reader / writer 12 is generally composed of an RF circuit 18, a loop antenna 19, a communication control circuit 21, an external interface circuit 22, and a power supply unit 24.

  The RF circuit 18 includes a demodulation unit and an amplification unit that demodulates received radio waves, and a modulation unit that modulates radio waves to be transmitted.

  The communication control circuit 21 is a circuit that switches between transmission and reception and controls communication.

  The external interface circuit 22 is a circuit that converts a signal input from the RS232C / RS422, USB standard, or CMOS interface so as to be suitable for a reader / writer.

  The power supply unit 24 supplies power to each element and takes in power from the battery 13 via the power control switch 14 and supplies power to each element.

  The non-contact IC card 17 includes an RF circuit 25, a loop antenna 26, a communication control circuit 27, a CPU 28, a RAM 29, a ROM 31, an EEPROM 32, a charging unit 33, and the like. Similar to the non-contact IC card reader / writer 12, the RF circuit 25 includes a demodulator and an amplifier for demodulating received radio waves and a modulator for modulating radio waves to be transmitted. Part of the received radio wave is converted into electric power by the rectifier circuit and supplied to the charging unit 33.

  When the CPU 28 reads a program stored in the ROM 31 and receives a command transmitted from the non-contact IC card reader / writer 12, the CPU 28 reads the data transmitted together with the command, performs necessary processing, and stores the result in a predetermined area of the EEPROM 32. Write to. A RAM 29 is a memory in which the CPU 28 writes temporary data necessary for processing.

  The power control switch 14 controls on / off of supplying power from the vehicle battery 13 to the power supply unit 24 of the non-contact IC card reader / writer 12. When the non-contact IC card reader / writer 12 is not used, When the switch is turned off to cut off the power supply from the battery 13 and it is detected that the non-contact IC card 17 or the hand holding the non-contact IC card 17 is approaching the vehicle, the non-contact IC card reader / writer The non-contact IC card reader 17 can be used by supplying power from the battery 13 by turning on the switch so that 12 can be used.

  A Doppler sensor module 16 that is a microwave sensor includes a voltage control 35 that controls a power supply, a pulse generator 36 that generates a pulse signal for intermittent operation, and a pulse drive 37 that drives a pulse signal generated by the pulse generator 36. 24. An oscillator 38 that transmits a microwave of 150 GHz, a transmission / reception antenna 39, a receiver 41 that receives a reflected microwave received by the transmission / reception antenna 39, a DC amplifier 42 that amplifies the received microwave, and a pulse generator 36 A synchronized analog switch 43, a waveform shaping unit 44 for obtaining a signal in a specific frequency region among reflected microwave signals obtained by synchronizing with the analog switch 43, an AC amplifier 45 for amplifying the waveform shaped signal, Converts the signal amplified by this AC amplifier 45 into a digital value The A / D converter 46 and the digital signal converted by the A / D converter 46 are input to determine whether or not the non-contact IC card is detected, and the held non-contact IC card 17 or the non-contact IC card 17 is When a hand to be held is detected, the control unit 47 is composed mainly of a microcomputer that outputs a control signal.

In the Doppler sensor module 16 having such a configuration, first, the microwave generated by the oscillator 38 is emitted outward from the transmission / reception antenna 39. A part of the emitted microwave hits an object (in this case, the hand or the non-contact IC card 17 held by the hand), is received by the transmission / reception antenna 39, and is input to the receiver 41. The microwave detected by the receiver 41 is amplified by the DC amplifier 42. The amplified detection signal is classified by the analog switch 43 so as to select the detection signal only for the transmission time with respect to the transmitted microwave. A microwave sensor detection voltage corresponding to the distance and speed of the separated non-contact IC card or the hand holding the non-contact IC card is extracted from the classified detection signal by a waveform shaping unit 44. Is obtained.
This microwave sensor detection voltage is amplified to a voltage sufficient to be converted by the A / D converter 42 by the AC amplifier 45, and the amplified sensor output is A / D converted by the A / D converter 42. 43.

When the non-contact IC card 17 or the hand holding the non-contact IC card 17 does not exist nearby, the microwave sensor detection voltage (sensor output) is constant. In such a state, it is determined that there is no non-contact IC card 17.
At this time, when the non-contact IC card 17 or the hand holding the non-contact IC card 17 approaches from a distance, a slight fluctuation is observed in the constant microwave sensor detection voltage.

Next, when the sensor output fluctuates, the non-contact IC card 17 or the hand holding the non-contact IC card 17 is approaching a certain distance. Actually, the proximity of the non-contact IC card 17 held by the hand is detected, but the proximity of the hand or arm portion is also detected.
As described above, when the proximity of the hand holding the non-contact IC card 17 or the non-contact IC card 17 is sensed, the control signal becomes active and the power control switch 14 is controlled to be turned on.

When the power control switch 14 is turned on, the DC power (VCC) of the battery 13 is supplied to the power supply unit 24 of the non-contact IC card reader / writer 12 for a predetermined time, and the non-contact IC card reader / writer 12 becomes active and is held over. The command is periodically sent until the contactless IC card 17 or the hand holding the contactless IC card enters the communication distance range.
The non-contact IC card reader / writer 12 becomes active and the non-contact IC card 17 or the non-contact IC can be detected even after a certain period of time since the hand holding the non-contact IC card 17 or the hand holding the non-contact IC card 17 can be detected. When the hand holding the card is not detected, the power control switch 14 is controlled to be turned off.

  The non-contact IC card 17 transmits a response when the command of the non-contact IC card reader / writer 12 is caught. Thereby, a transaction is started between the non-contact IC card 17 and the non-contact IC card reader / writer 12. Thereafter, the non-contact IC card reader / writer 12 transmits a mutual authentication command and a command for reading / writing information as necessary, and the non-contact IC card 17 performs processing according to the received command.

  As described above, the Doppler sensor module 16 that uses the Doppler effect with respect to the non-contact IC card reader / writer 12 mounted on the vehicle is located in the vicinity of the non-contact IC card reader / writer 12, and the non-contact IC card 17. However, this is not limited to vehicles, for example, vending machines, gate paths for transportation, entrance paths to specific facilities, etc. Can be used.

  The power of the non-contact IC card reader / writer is supplied by the microwave sensor using the Doppler effect when it is detected when it is detected and the hand holding the non-contact IC card is detected. It is possible to provide a non-contact IC card reader / writer device in which the power is turned off when the contact IC card reader / writer is not used and the power is turned on only when used.

It is the block diagram which showed schematically the non-contact reader / writer apparatus which concerns on this invention.

Explanation of symbols

11 Contactless Reader / Writer Device 12 Contactless IC Card Reader / Writer 13 Battery 14 Power Control Switch 15 Human Body 16 Doppler Sensor Module 17 Contactless IC Card 18 RF Circuit 19 Loop Antenna 21 Communication Control Circuit 22 External Interface Circuit 23 PLL
24 power supply unit 25 RF circuit 26 loop antenna 27 communication control circuit 28 CPU
29 RAM
31 ROM
32 EEPROM
33 Charging unit 34 Microwave sensor 35 Voltage control 36 Pulse generator 37 Pulse drive 38 Oscillator 39 Transmission / reception antenna 41 Receiver 42 DC amplifier 43 Analog switch 44 Waveform shaping unit 45 AC amplifier 46 A / D converter 47 Control unit

Claims (2)

A non-contact reader / writer device comprising a non-contact IC card reader / writer having an antenna that radiates radio waves to a non-contact IC card,
A microwave sensor using a Doppler effect is installed at a position where the non-contact IC card reader / writer is installed and can be detected by holding the non-contact IC card.
When the microwave sensor detects the non-contact IC card held over the non -contact IC card reader / writer, a switch for automatically supplying power to the non-contact IC card reader / writer is turned on. A non-contact reader / writer device. A non-contact reader / writer device comprising a non-contact IC card reader / writer mounted on a vehicle and supplied with power supplied to the vehicle,
A microwave sensor using the Doppler effect is installed at a position where the non-contact IC card reader / writer is installed and can be detected by holding the non-contact IC card,
When the microwave sensor detects the non-contact IC card held over the non -contact IC card reader / writer, a switch for automatically supplying power to the non-contact IC card reader / writer is turned on. A non-contact reader / writer device.

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