JPS62287389A - Id card - Google Patents

Abstract

PURPOSE:To reduce power consumption and to obtain a small-sized ID card which is usable for a long period by transmitting an ID code set in the ID card by ratio only when the ID card approaches an ID code discriminating device and detects a high frequency magnetic field produced by the ID code discriminating device. CONSTITUTION:An exciting loop antenna 2 is arranged at an entrance and exit and driven by an exciting device 1. The exciting device 1 excites an exciting loop antenna 2 within the frequency band of tens - hundreds of KHz. The ID card 3 detects the high frequency magnetic field produced by the exciting loop antenna 2 and transmits the ID code signal corresponding to the predetermined ID code by radio. A receiver 5 receives the ID code signal transmitted from the ID card and a decision device 6 decides the ID code obtained from the receiver 5. The ID card sends out the ID code as necessary, so the power consumption is minimized.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention (a) Technical Field The present invention relates to an ID card used with a D-code identification device in an ID card system.

fb) Summary of the Invention The ID card according to this invention has an ID code set by a switch, circuit, etc., and the person to be identified is in possession of the card, or the card in possession is authorized. It is used in ID card systems to identify the identity of the person.

In particular, this invention is designed to wirelessly transmit the 10 code set in the ID card only when the ID card approaches the ID code identification device and a high frequency magnetic field generated from the ID code identification device is detected. It is something.

(C) Background of the Invention Conventionally, in ID devices for identifying a specific person, a card provided with a magnetic stripe (magnetic card) has been most widely used as an ID cart carried by a specific person. However, in order to read the contents recorded on the magnetic stripe, the magnetic card must be passed through a magnetic card league, which is a cumbersome task. Furthermore, since the magnetic stripe for recording the ID code is exposed, it is easily scratched, and when it comes close to a ferromagnetic material, there is a problem that the recorded content may disappear or change in quality. On the other hand, regular maintenance is required to prevent wear of the read head of the magnetic card reader provided in the ID code identification device, the magnetic card conveyance device, and the like. Furthermore, because the structure and principle are simple, it is relatively easy to read or tamper with the recorded contents, and there is a risk of misuse. Therefore, the ID code was stored or recorded inside the ID card, and it could not be accessed from the outside. It is conceivable to read out the ID code by touching it. To achieve this, it is necessary to incorporate a power supply into the card so that the ID card can operate independently, but due to space limitations, it is not possible to incorporate a large-capacity battery, and the question is how to reduce power consumption. It becomes a problem.

(d+Object of the Invention This invention provides an ID code identification device that
It is an object of the present invention to provide an ID card which wirelessly transmits an ID code to a D-code identification device, and whose power consumption is particularly reduced, which is compact and can be used for a long period of time.

(e1 Structure and Effect of the Invention This invention provides an I/O device equipped with a high-frequency magnetic field generating means for generating a high-frequency magnetic field in a predetermined space, and an ID code signal receiving means for receiving an ID code signal transmitted from an ID card.
An ID card that is used together with a D-code identification device to configure an ID card system, which includes a switch circuit that controls power supply to a transmitter, and which wirelessly transmits an ID code signal corresponding to a predetermined ID code. a code transmission means, a high frequency magnetic field detection means for detecting a high frequency magnetic field,
and switch circuit control means that turns on the switch circuit when the detection means detects a high-frequency magnetic field and turns off the switch circuit after a certain period of time or when the high-frequency magnetic field detection means does not detect a high-frequency magnetic field. By configuring as described above, the ID
The cart detects the high frequency magnetic field generated by the ID code identification device and turns on a switch circuit that controls power supply to the transmitter of the ID code transmitter. This allows the ID
The code transmitting means wirelessly transmits an ID code signal corresponding to a predetermined ID code. The ID code identification device receives the ID code signal wirelessly transmitted from the D card and identifies the ID code. ID code identification device is ID
After identifying the code, if you stop generating the high frequency magnetic field,
The ID card turns off the switch circuit and turns off the power of the ID code transmitting means. Alternatively, the ID code transmitting means turns off the switch circuit after a certain period of time after wirelessly transmitting the D code.

In this way, the ID card transmits the ID code only when necessary, so power consumption can be kept to a minimum.

This makes it possible to use the ID card for a long period of time even if the capacity of the battery built into the ID card is small.

(f) Embodiment FIG. 1 is a diagram showing the configuration of a D card system, which is an embodiment of the present invention.

The figure shows a state in which a person carrying an ID card 3 approaches the exit. An excitation loop antenna 2 is placed at the exit and is driven by an excitation device l. The excitation device 1 consists of an oscillation circuit (○5C) 10 and an amplifier circuit 11,
Excitation loop antenna 2 at several 10 KHz to several 100 K
Excite in the Hz frequency band. The size of this excitation loop antenna.

The shape and excitation power are the size of the exit gate.

It is set according to the entry/exit route of the ID card holder. The ID card 3 detects the high frequency magnetic field generated by the excitation loop antenna 2 and wirelessly transmits an ID code signal corresponding to a predetermined ID code. The receiving device 5 receives the ID code signal transmitted from the ID card, and the determining device 6 determines the ID code obtained by the receiving device 5.

FIG. 2 GA+, (B) is a diagram showing the structure of an ID card, where the figure represents a plane and (Bl represents its cross section, respectively).

As shown in the figure, a loop coil 33 is embedded in the peripheral portion of the card, and is used as a coil of a tuning circuit as will be described later. 30.31 is a circuit that detects a high frequency magnetic field and a circuit that wirelessly transmits an ID code signal,
It is composed of an IC circuit. Reference numeral 32 denotes an ID code setting section consisting of a plurality of switch circuits, and ID codes are individually set during or after the manufacture of this ID card. The battery 34 is a thin battery, and the circuit 30.31
Used as a power source.

FIG. 3 is a block diagram of a circuit built into the same [D card].

The tuning circuit 35 is a circuit that does not require a power source, uses the loop coil 33 as a coil for eight rounds, and tunes to the frequency of the high frequency magnetic field generated by the excitation loop antenna 2 as shown in FIG. The detection circuit 36 detects and amplifies the output signal of the tuning circuit 35 to obtain a DC signal. When the level of this DC signal exceeds a certain value, the comparator 37 turns on the switch circuit 38. 34 is the thin battery, which is used as a power source for the entire circuit.

The shift register 40 takes in the on/off state of each switch of the ID code setting section 32 as focus data, and converts it into a serial signal at a predetermined timing. The encoder 41 performs encoding based on the signal output from the shift register 40. The transmission control circuit 42 is triggered by the transmission trigger signal output from the timing control circuit 44 and generates a transmission signal including a signal corresponding to the ID code output from the encoder 41. Modulation circuit 45
modulates this transmission signal, and the transmission circuit 46 performs wireless transmission through the transmission antenna 47. This modulation circuit 45
The circuits other than the transmission circuit 46 and the tuning circuit 35 are composed of CMO3 circuits, resulting in low power consumption.

Normally, in a place where a high frequency magnetic field is not generated, the switch circuit 38 is in an off state, so power is not supplied to the modulation circuit 45 and the transmission circuit 46, and no power is consumed. Further, no clock is generated from the clock generator 43. For this reason, the shift register 40. is composed of three CMO circuits. Encoder 41. The transmission control circuit 42 and timing control circuit 44 consume almost no power. Therefore, the detection circuit 36 and the comparator 37
Only this will result in an extremely low power consumption state. For this reason, the capacity of the battery that should be built into the 10 card is not so large (and the ID card can be used for a long period of time. Note that if the detection circuit 36 is not provided with an amplification circuit to amplify the DC signal after detection) No power supply is required for this detection circuit.

Further, when the switch circuit 38 is in the off state, it can be configured to turn off the power of all the circuits for wirelessly transmitting the ID code signal corresponding to the ID code.

FIG. 4 is a diagram showing signals at various parts of the circuit diagram shown in FIG. 3.

When the ID card approaches a place where a high-frequency magnetic field is generated, the output level of the received signal a (output of the tuning circuit 35) gradually increases, and when it exceeds a certain value (timing (1)), the switch circuit 38 is activated. Turns on. Accordingly, the timing control circuit 44 generates a transmission trigger signal C, and the transmission control circuit 42 outputs a transmission pulse d.

As shown in FIG. 4, the transmission pulse signal is composed of a preamble region, (1) D code data D, and its bit inverted data. The ID code data has a parity check bit added to it, a start bit at the beginning,
A stop focus is provided at the rear end.

The preamble is added so that the reception level is stabilized also by the operation of AGC provided in the reception device, and acts as a carrier component of the transmission signal. Note that, as shown in the figure, the transmission pulse is repeatedly generated each time a transmission trigger is generated, but intermittent transmission is performed with a certain pause time provided in order to reduce power consumption during transmission.

FIG. 5 shows a block diagram of the receiving device 5 and the determining device 6 (see FIG. 1).

The receiving device 5 is a device that receives an ID code signal transmitted from an ID card and extracts the ID code. The high frequency amplification circuit 50 amplifies the high frequency signal received from the receiving antenna 4, and the tuning circuit 51 amplifies the high frequency signal received from the receiving antenna 4.
Tune in to the D code signal. The detection circuit 52 detects the signal, and the decoder circuit 53 decodes the ID code. The error determination circuit 54 performs a parity check etc. when decoding the ID code from the bit serial signal output from the detection circuit 52, determines whether the decoding result is normal, and performs error correction. The interface circuit 56 is a circuit that outputs an ID code to the determination device 6, and is composed of a serial/parallel conversion circuit. The display device 55 is used to indicate that there is an output signal from the decoder 53, and is used to indicate that an ID code signal is being transmitted from the ID card.

The overall control of the determination device 6 is controlled by program processing of the CPU 60. The ROM 61 is a memory in which the control program is written in advance, and the RAM 62 is a memory used as a working area when executing the control program. The CPU 60 inputs the ID code output from the receiving device 5 via l1063. The floppy disk drive device 65 is controlled by the controller 64 and is used as an external memory for the CPU 60. This external memory has prerecorded the ID code of an ID card owned by a person who is permitted or prohibited from passing through the exit. The CPU 60 loads the ID code from this external memory into the RAM 62 in advance, determines whether the ID code manually entered from the receiving device 5 exists in the data, and determines that the person in possession of the ID card is the authorized person. Make a judgment. The CRT 67 is a display device that displays permission, disapproval, etc., and is controlled by a controller 66. The staff member can check the display on the CRT and take appropriate action.

By configuring the ID card and the ID code identification device as described above, the ID card transmits the ID code signal only within the high frequency magnetic field generated by the ID code identification device, making it possible to save power on the built-in battery. .

In the above embodiment, the switch circuit provided in the ID code turns off the power of the modulation circuit and the transmission circuit and stops the clock of the circuit that generates the 10 code signal in a place where a high frequency magnetic field is not generated. , which essentially turns off the power, but when the switch circuit is off,
It can also be configured to turn off the power to all circuits except for the circuit for detecting high frequency magnetic fields. FIG. 6 is a block diagram showing an example thereof.

In this figure, 48 is a circuit that generates an ID code signal, and includes a so-called ACL circuit. When the switch circuit 38 is turned on and power is supplied to this circuit, the AC
The L circuit is activated and starts operation after the entire circuit is reset. On the other hand, since power is supplied to the modulation circuit 45 and the transmission circuit 46 when the switch circuit 38 is turned on, the circuit 4
It modulates the ID code signal output from 8 and transmits it.

FIG. 7 shows yet another embodiment, and shows a block diagram of a control section provided in the ID card, similar to that shown in FIG. 3 or FIG. 6.

In the figure, 49 is a flip-flop, and the tuning circuit 3
5 is tuned to the high frequency magnetic field, the output of the comparator 37 becomes "H" level, the flip-flop 49 is turned on, and the switch circuit 38 is turned on. As a result, the ID code signal generation circuit 48, the modulation circuit 45 and the transmission circuit 4
Power is supplied to 6. After outputting the ID code signal a predetermined number of times, the timing control circuit 44 resets the flip-flop 49 and turns off the switch circuit 38. As a result, the ID code signal generation circuit 48. The modulation circuit 45 and the transmission circuit 46 are powered off and enter a standby state.

In this way, when a high frequency magnetic field is detected, the ID is activated for a certain period of time.
An ID card that wirelessly transmits a code signal can save power even when it is present in the magnetic field area of an excitation loop antenna for a long time. Further, even if there are multiple people with ID cards, if there is a time difference when entering the area, it is effective to prevent interference between signals transmitted from each ID card.

[Brief explanation of drawings]

Figure 1 shows an I
Figure 2 is a diagram showing the configuration of the D card system, and Figure 2 is a diagram showing the configuration of the ID card. Figure 2 is a plan view, and (Bl is a cross-sectional view. Figure 3 is a diagram showing the control circuit provided in the ID card. The block diagram, FIG. 4 is a diagram showing the signals of each part, and FIG. 5 is a block diagram of the control section of the receiving device and the determining device, which constitute the ID code identification device. A block diagram of a control unit of an ID card according to another embodiment is shown. 1-excitation device, 2-excitation loop antenna, 3-ID card, 4-reception antenna, 5-reception device, 6-determination device, 33. 35, 36. 37-High frequency magnetic field detection means, 38-
Switch circuit, 45-modulation circuit, 46-transmission circuit.

Claims (1)

[Claims] (1) An ID card equipped with a high-frequency magnetic field detection means for detecting a high-frequency magnetic field, and an ID code transmission means for wirelessly transmitting an ID code signal corresponding to a predetermined ID code when the detection means detects a high-frequency magnetic field. , an ID code identification device comprising: a high-frequency magnetic field generating means for generating a high-frequency magnetic field in a predetermined space; and an ID code receiving means for receiving an ID code signal transmitted from the ID card; The ID code transmitting means includes a switch circuit that controls power supply to the transmitting section, and the high frequency magnetic field detecting means includes:
turning on the switch circuit when detecting a high frequency magnetic field;
An ID card comprising switch circuit control means for turning off the switch circuit after a certain period of time or when no high frequency magnetic field is detected.