JP2000057277A - Noncontact type card confirmation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a noncontact type card confirmation device which requires no long time to confirm the adequacy of a card, responds quick, and reduces unnecessary irradiation due to transmit and receive radio waves. SOLUTION: This device has a loop antenna 3 which is provided to or inside an enclosure that a noncontact type card 20 is in contact with or faces closely along the top surface side of the enclosure and supplies an electromagnetic wave to the noncontact type card 20, and a sensor which detects the noncontact type card 20 being close opposite the loop antenna 3, and further has a transmitting circuit 6 which generates an electromagnetic wave for at least power supply according to the detection signal of the sensor and sends it out to the noncontact type card 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact type card confirmation device, and more particularly, to an entry / exit management device and an IC card for exchanging data with an IC cart in a non-contact state and confirming the validity of the IC card. In an IC card confirmation device represented by a reader / writer (hereinafter referred to as a reader / writer), it does not take much time to check the validity of the card, and the response is good.
Also, the present invention relates to a non-contact type IC card checking device capable of reducing unnecessary radiation due to transmission / reception radio waves.

[0002]

2. Description of the Related Art An entry / exit room management apparatus manages entry / exit of a building, a company, a factory, a laboratory, or other building or hall, or each of the rooms inside the building using an IC card as a key. Device. In this specification, the term "entrance / exit" includes the meaning of entering / leaving, and the terms "room" and "room" are used in the same meaning. In addition, the confirmation here is used in a sense including so-called personal authentication. Conventionally, there has been known a system for opening and closing a door using a card as a key when entering or leaving a building or a building such as a company or an apartment, a room or a room thereof. This is because a terminal having a reader / writer function is provided adjacent to a door as an entrance and exit, and a password is stored in the terminal, and the IC card is checked by collating this with a password recorded on a card. Is confirmed, the unlock means is operated to open the key, and entry into the room is permitted.

[0003] This type of access control system generally adopts a always-locked form, in which the door is automatically locked when the door is closed after the door is opened with an IC card and the user enters the room. This means that the door can be freely opened from the inside, but the door cannot be opened from the outside unless there is an IC card, except for specially set times such as working hours. Many IC cards used in the entry / exit management system are of the terminal contact type in which a reader / writer takes in an IC card, but recently, a non-contact type IC card in which an IC card is simply brought close to a reader / writer is used. It is starting to be used. The non-contact type IC card transmits and receives information to and from a reader / writer by electromagnetic induction or electromagnetic coupling. An example of this type is, for example, JP-A-8-330839, which mainly uses an automatic ticket gate. Conventionally, a non-contact type IC card itself has a built-in battery. However, recently, a non-contact type IC card which supplies power by radio waves and transmits / receives it has been considered. This is described in, for example,
No. 330840 and the like.

[0004]

The technology described in each of the above-mentioned publications is mainly for automatic ticket gates and the like, and uses a non-contact type IC card as an entry / exit management system to supply power and transfer information. Not suitable for those who do. Because the entry / exit management system is a close contact type (non-contact type IC)
Data is transmitted and received at a distance of several centimeters in close or close proximity to a reader / writer as a distance of about 0 to 2 mm to a card or a proximity type (up to about 2 mm to 10 cm). In this regard,
This is because there is a difference in that data is transmitted / received to / from a proximity type (about 70 cm) reader / writer or a longer distance of about 1 m to several meters by radio waves to exchange information. The transmission and reception and power supply of non-contact type cards have the problem of the former in the radio law,
Furthermore, in the entry / exit management system using a non-contact type IC card, according to the standardization of ISO, a contact type of 4.91 MH
Since a radio wave having a frequency of 13.56 MHz is used in the proximity type z, unnecessary radiation is a problem. If the output at the frequency on the order of MHz increases due to the situation of the place where the card checking device (reader / writer) is installed in the entrance / exit management system, surrounding electric appliances and electronic devices are adversely affected. According to the Radio Law, the electric field strength is set to 500 μV / m at a position 3 m away from the emission position of the electric field.
It is supposed to be as follows.

[0005] Incidentally, since the detection of the entering / leaving person is irregular in terms of time, it is necessary to always generate a radio wave for power supply. For this reason, the power of the generated radio wave is limited to a small value, which makes it impossible to detect and confirm the card sufficiently, and it takes a long time before the IC card receives the power supply and starts operating. SUMMARY OF THE INVENTION An object of the present invention is to solve such a problem of the prior art, to reduce the unnecessary radiation due to transmission / reception radio waves with good responsiveness without taking time to check the validity of the card. It is to provide a confirmation device.

[0006]

Means for Solving the Problems The structure of the non-contact type card checking device of the present invention for achieving the above object is as follows.
A non-contact type card verification device that supplies power and reads data to a non-contact type card that exchanges information by electromagnetic induction and checks the validity of the card. A loop antenna provided along the surface of the body or inside the housing or inside thereof to supply electromagnetic waves to the non-contact type card, a sensor for detecting that the non-contact type card is in a close position facing the loop antenna, and a sensor And a transmission circuit for generating at least an electromagnetic wave for power supply in accordance with the detection signal and transmitting the generated electromagnetic wave to the non-contact type card.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, a loop antenna is built in a housing along a surface side of a case where the non-contact type card is in close contact with or close to the case, and the non-contact type card is opposed by a sensor. And sends an electromagnetic wave for power supply to the contactless card. This allows
Electromagnetic waves generated for power supply can be generated when the card is close to the loop antenna. As a result, radio waves can be generated in the presence of a load that receives radio waves, so even if the output of the radio waves is slightly increased, most of them are received by the card side. Reduce. Power can be sufficiently supplied to the card side in a narrow range detected by the sensor. As a result, the power supply time to the card side is shortened, the operation time until transmission and reception can be reduced, and the validity of the card does not take much time, and the responsiveness is improved. Moreover,
At this time, since it is sufficient to generate a radio wave having a strength enough to transmit and receive at close or close distances, it is possible to easily avoid unnecessary radiation and restrictions of the Radio Law.
In addition, power consumption is reduced because radio waves need not always be output. In particular, by arranging the sensor in the center of the inside of the loop antenna and limiting the position detected by the sensor to a distance of about 0 to 5 cm, the worst relation between the loop antenna and the non-contact type card serving as a load is obtained. However, in any direction, the overlapping area between the card and the loop antenna is performed in an area equal to or more than 1/4 of the area of the loop antenna, and usually, an overlapping area of about 1/2 can be secured. As a result, an appropriate load state is maintained for the loop antenna when transmitting and receiving radio waves, so that it is possible to easily avoid unnecessary radiation and restrictions of the Radio Law.

[0008]

FIG. 1 is an explanatory view mainly showing a non-contact type IC card reader / writer according to an embodiment to which the non-contact type card checking device of the present invention is applied, and FIG. FIG. 3 is an external view of a contact type IC card reader / writer, and FIG. 3 is a cross-sectional explanatory view centering on a sensor provided at a central portion on the front surface side. FIG. 2 shows the appearance of a non-contact type IC card reader / writer, 1 is a housing of a non-contact type IC card reader / writer 10, and its surface 2 is a non-contact type IC card reader / writer.
There is a card detection surface that the C card faces. As shown by a dotted line, the non-contact type IC card 20
(Hereinafter referred to as an IC card 20) has a built-in loop antenna 3 for radiating radio waves for transmitting and receiving data. An infrared sensor 4 is provided at the center of the detection surface 2 inside the loop antenna 3.
Is provided. Reference numeral 5 denotes a reader / writer mounting portion on the side of a door such as a room to enter or leave, in which the housing 1 is disposed at a position slightly higher than the height of the knob 31 of the door 30. You.

A circuit as shown in FIG. 1 is built in the housing 1 as a non-contact type IC card reader / writer 10. In FIG. 1, reference numeral 6 denotes a transmission circuit for transmitting a radio signal to the loop antenna 3; a switch 7 for operating the transmission circuit 6; a controller 8 for controlling ON / OFF of the switch 7; IC
A receiving circuit 9 for receiving a received signal from the card 20 is provided. The receiving circuit 9 further includes a data processing IC module 11 connected to the transmitting circuit 6 and the receiving circuit 9, a comparator, and receives a signal from the infrared sensor 4. A card detection circuit 12 for generating a card detection signal, and an IC card 2
An oscillator circuit 13 is provided as a signal source generated by the reader / writer 10 as a radio wave serving as a power source for 0. The card detection signal of the card detection circuit 12 is sent to the controller 8. Here, the loop antenna 3 plays a role of a transmission / reception coil, and is coupled to a transmission / reception coil 21 provided in the non-contact type IC card 20 via electromagnetic waves by electromagnetic induction.

Here, the oscillation circuit 13 generates a signal having a frequency of 4.91 MHz for the close contact type and 13.56 MHz for the close proximity type and transmits the signal to the IC card 20 as a radio wave via the transmission circuit 6 and the loop antenna 3. Send out. The IC card 20 receives the radio wave by the transmission / reception coil 21, applies it to a rectifier circuit via a filter, smoothes it, converts the electric wave into DC voltage power, and uses a constant-voltage power supply circuit or the like to perform, for example, DC power supply.
The electric power stabilized to about 2 V to 5 V is generated to charge a capacitor or the like. Further, this charging voltage is applied to the IC card 20.
To each circuit inside. When the received radio wave is a modulated radio wave, it is extracted as a signal from the rectifier circuit, demodulated, and sent to the data processing circuit.
The modulation by the data at this time is ASK or FSK.
Modulation. Here, data sent from the reader / writer 10 to the IC card 20 is generated in an arithmetic processing circuit having a microprocessor or the like in the data processing IC module 11, and the radio wave is subjected to ASK modulation or FSK modulation in the transmission circuit 6. Sent out. On the other hand, the data received from the IC card 20 is transmitted to the receiving circuit 9.
, And is received by the data processing IC module 11. At the time of the power supply, ASK or FSK
In SK, a radio wave having a digital value corresponding to non-modulation and a frequency having a constant amplitude corresponding to all “1” bits is transmitted to the IC card 20 for a certain period.

In the above case, the output of radio waves on the order of MHz is a problem. Here, the card detection circuit 12 detects a signal from the infrared sensor 4 and detects when the IC card 20 is approached from the loop antenna 3 by approaching a position of about 0 to 5 cm to detect the card. Generate a signal. Therefore, the card detection circuit 12
A signal from the infrared sensor 4 is compared by a comparator having a predetermined threshold to generate a detection signal. The controller 8 receiving this detection signal turns the switch 7 from OFF to ON to operate the transmission circuit 6, and is controlled by the data processing IC module 11 to amplify the signal of the oscillation circuit 13 so as to amplify the power for a predetermined period described above. A radio wave having a predetermined amplitude corresponding to the above-mentioned bit "1" for supply is generated at a predetermined output. Then, when the data processing IC module 11 operates to transmit / receive data to / from the IC card 20 and the processing is completed, or when the data processing IC module 1 performs predetermined data processing based on the received data.
1 judges the validity of the IC card 20 and when the result is obtained, the data processing IC module 11
, A control signal for turning off the switch 7 is generated. In response to this, the controller 8 turns off the switch 7 to stop the operation of the transmission circuit 6, and stops the transmission of radio waves from the loop antenna 3.

As a result, in this embodiment, the IC card 2
A radio wave is generated only when 0 is opposed to the loop antenna 3 close to a position of about 0 to 5 cm. When the data processing IC module 11 determines the validity of the IC card 20 and confirms the validity, the driving circuit for unlocking the door and the like are operated as described in the related art to lock the door. Cancel. When the IC card 20 is unauthorized, such a driving operation is not performed.

In this embodiment, since the infrared sensor 4 is arranged at the center of the card detection surface 4 and is located at the center of the loop of the loop antenna 3, the IC card which becomes a load on the loop antenna 3 is used. Even in the worst case, the area of the overlap between the IC card 20 and the loop antenna 3 is at least １ ／ of the area of the loop antenna 3 in any direction. Also,
Usually, an overlap area of about 1/2 can be secured.
Thereby, the IC card 20 can be maintained in an appropriate load state with respect to the radio wave generated by the loop antenna 3. IC
In order to generate a card detection signal when the card 20 is brought close to the position about 0 to 5 cm from the loop antenna 3, the light emitting element 4a (see FIG. 3) and the light receiving element 4b (see FIG. 3), the set angle, and the threshold setting of the comparator of the card detection circuit 12 described above. Among them, the threshold can be set by appropriately selecting the relationship between the directivity of the light emitting element 4a and the light receiving element 4b and the light receiving sensitivity. Or 5cm
It is also possible to reduce unnecessary radiation by providing a circuit for preventing the detection of more than a certain degree.

FIG. 3 is an explanatory diagram of the arrangement of the light emitting element 4a and the light receiving element 4b of the infrared sensor 4 and the set angles. First, as shown in the drawing, the infrared sensor 4 is arranged at a substantially central portion of the loop of the loop antenna 3. As a result, the IC card 20 faces the loop antenna 3, and the IC card 20
It can be detected that the card 20 is in a sufficient load state as a radio wave reception target. 14 is an infrared sensor 4
Is a cylindrical housing having a conical tip, and the light emitting element 4a and the light receiving element 4b are mounted in holes provided in the bracket 15, respectively. A focusing lens lens 16a and a condensing lens 16b are provided at the distal ends of the light emitting element 4a and the light receiving element 4b, respectively, and are fixed to an opening 17 provided in the card detection surface 2 by a resin 17. The loop antennas 3 are also fixed by the resin 19 on the back side of the card detection surface 2. Here, the angle between the light emitting element 4a and the light receiving element 4b of the infrared sensor 4 is related to the directivity of the light emitting element 4a and the light receiving element 4b.
It is preferable that the cross point C of these optical axes is set to a position of about 0.5 cm to 2 cm from the detection surface 2 by setting to about degrees.

As described above, in the embodiment, one sensor is provided at the center of the loop of the loop antenna. However, a plurality of sensors are arranged and an IC card is provided under a logical product condition of the plurality of sensors. May be detected to be in a proper load state on the reader / writer. Further, in the embodiment, the infrared sensor having the light emitting element and the light receiving element is used. However, without being affected by disturbance light or disturbance noise, a state in which the non-contact type card is in close contact with or close to the loop antenna is detected. It does not matter the form or structure of the sensor as long as the sensor can perform the operation. Any sensor may be used. For example, a non-contact type card is usually operated by a person so as to touch the card detection surface, so that a heat source can be detected by using a pyroelectric infrared sensor that detects a hand or finger in close proximity. Detection of the above condition is possible.

[0016]

As described above, according to the present invention, the loop antenna is built in the housing along the surface side of the housing where the non-contact type card is in close contact with or in close proximity to the non-contact type card, and the non-contact type is detected by the sensor. An electromagnetic wave for power supply is transmitted to the non-contact type card upon detecting that the type card has faced. Thus, the electromagnetic wave generated for power supply can be generated in a state where the card is close to the loop antenna. As a result, radio waves can be generated in the presence of a load that receives radio waves,
At this time, even if the output of the radio wave is slightly increased, most of the radio wave is received by the card side, so that the radiation amount of the radio wave to the surroundings is reduced. Power can be sufficiently supplied to the card side in a narrow range detected by the sensor. As a result, the power supply time to the card side is shortened, the operation time until transmission and reception can be reduced, and the validity of the card does not take much time, and the responsiveness is improved. In addition, at this time, since it is sufficient to generate a radio wave having a strength enough to transmit and receive at close or close distances, it is possible to easily avoid unnecessary radiation and restrictions under the Radio Law. Furthermore, power consumption is reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view centering on a non-contact type IC card reader / writer of one embodiment to which a non-contact type card checking device of the present invention is applied.

FIG. 2 is an external view of the non-contact type IC card reader / writer shown in FIG.

FIG. 3 is an explanatory cross-sectional view centering on a sensor provided in a central portion on a front surface side thereof.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Housing, 2 ... Card detection surface, 3 ... Loop antenna, 4
... Infrared sensor, 5 ... Reader / writer mounting part, 6 ... Transmission circuit, 7 ... Switch, 8 ... Controller, 9 ... Reception circuit, 10 ... Non-contact type IC card reader / writer, 11 ...
Data processing IC module, 12 ... Card detection circuit, 1
3. Oscillation circuit.

[Procedure amendment]

[Submission date] September 22, 1999 (September 9, 1999
2)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0002

[Correction method] Change

[Correction contents]

[0002]

2. Description of the Related Art An entry / exit management device is a management device for managing entry / exit in a building, a building, a building such as a company, a factory, a research laboratory, or each room inside the building using an IC card as a key. is there. In this specification, the term "entrance / exit" includes the meaning of entering / leaving, and the terms "room" and "room" are used in the same meaning. In addition, the confirmation here is used in a sense including so-called personal authentication. Conventionally, there has been known a system for opening and closing a door using a card as a key when entering or leaving a building or a building such as a company or an apartment, a room or a room thereof. This is because a terminal having a reader / writer function is provided adjacent to a door as an entrance and exit, and a password is stored in the terminal, and the IC card is checked by collating this with a password recorded on a card. Is confirmed, the unlock means is operated to open the key, and entry into the room is permitted.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

[0006]

Means for Solving the Problems The structure of the non-contact type card checking device of the present invention for achieving the above object is as follows.
A non-contact type card verification device that supplies power and reads data to a non-contact type card that exchanges information by electromagnetic induction and checks the validity of the card. A loop antenna that is provided along the surface of the body or inside the housing or inside the housing and supplies electromagnetic waves to the non-contact type card ;
A sensor that is provided inside the loop and detects that the non-contact type card is in a proximity position facing the loop antenna,
After receiving the signal from this sensor,
From loop antenna to power contactless card
Appropriate load condition to reduce unnecessary radiation for generated radio waves
To detect that the contactless card is positioned
And a transmission circuit for generating at least an electromagnetic wave for power supply in accordance with a detection signal of the card detection circuit and transmitting the generated electromagnetic wave to a non-contact type card.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, a loop antenna is built in a housing along a surface side of a housing where a non-contact type card is in close contact with or close to the housing, and is installed inside a loop of the loop antenna.
The non-contact type card is properly loaded by the sensor
The electromagnetic wave for power supply is detected and transmitted to the non-contact type card by detecting the confrontation at the position . Thus, the electromagnetic wave generated for power supply can be generated in a state where the card is close to the loop antenna. As a result, radio waves can be generated in the presence of a load that receives radio waves, so even if the output of the radio waves is slightly increased, most of them are received by the card side. Reduce. Power can be sufficiently supplied to the card side in a narrow range detected by the sensor. As a result, the power supply time to the card side is shortened, the operation time until transmission and reception can be reduced, and the validity of the card does not require much time, and the responsiveness is improved. In addition, at this time, since it is sufficient to generate a radio wave having a strength enough to transmit and receive at close or close distances, it is possible to easily avoid unnecessary radiation and restrictions under the Radio Law. In addition, power consumption is reduced because radio waves need not always be output. In particular, the sensor is arranged at the center inside the loop antenna, and the position detected by the sensor is set to 0.
The distance between the loop antenna and the non-contact type card as a load is at worst in any direction by limiting the distance between the loop antenna and the non-contact card to about 5 cm. This is performed in the above area, and usually, an overlap area of about 1/2 can be secured. As a result, an appropriate load state is maintained for the loop antenna when transmitting and receiving radio waves, so that unnecessary radiation and restrictions of the Radio Law can be easily avoided.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

FIG. 3 is an explanatory diagram of the arrangement of the light emitting element 4a and the light receiving element 4b of the infrared sensor 4 and the set angles. First, as shown in the drawing, the infrared sensor 4 is arranged at a substantially central portion of the loop of the loop antenna 3. As a result, the IC card 20 faces the loop antenna 3, and the IC card 20
It can be detected that the card 20 is in a sufficient load state as a radio wave reception target. 14 is an infrared sensor 4
Is a cylindrical housing having a conical tip, and the light emitting element 4a and the light receiving element 4b are mounted in holes provided in the bracket 15, respectively. Each tip portion of the light emitting element 4a and the light receiving element 4b, respectively provided focusing lens lens 16a and the condenser lens 16b are mounted and fixed to an open port provided in the card detection surface 2 by the resin 17. The loop antennas 3 are also fixed by the resin 19 on the back side of the card detection surface 2. Here, the angle between the light emitting element 4a and the light receiving element 4b of the infrared sensor 4, which is related to the directivity of the light emitting element 4a and the light receiving element 4b, is set to, for example, about 90 to 120 degrees. The cross point C of these optical axes is set at 0.
It is good to set it at about 5 cm to 2 cm.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction contents]

[0016]

As has been described above, according to the present invention, in the present invention, come incorporates a loop antenna in the housing along the surface side of the housing contactless card is in close contact with or in close proximity facing
A sensor provided inside the loop detects that the non-contact type card has confronted at a position where an appropriate load is applied, and transmits an electromagnetic wave for power supply to the non-contact type card. Thus, the electromagnetic wave generated for power supply can be generated in a state where the card is close to the loop antenna. As a result, radio waves can be generated in the presence of a load that receives radio waves, so even if the output of the radio waves is slightly increased, most of them are received by the card side. Reduce. Power can be sufficiently supplied to the card side in a narrow range detected by the sensor. As a result, the power supply time to the card side is shortened, the operation time until transmission and reception can be reduced, and the validity of the card does not take much time, and the responsiveness is improved. In addition, at this time, since it is sufficient to generate a radio wave having a strength enough to transmit and receive at close or close distances, it is possible to easily avoid unnecessary radiation and restrictions under the Radio Law. Furthermore, power consumption is reduced.

[Procedure amendment 7]

[Document name to be amended] Drawing

[Correction target item name] Figure 3

[Correction method] Change

[Correction contents]

FIG. 3

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Claims (3)

[Claims] 1. A non-contact type card verification device for supplying power and reading data to a non-contact type card for exchanging information by electromagnetic induction and verifying the validity of the card, wherein the non-contact type card is A loop antenna provided along the surface side of the housing that is in close contact or close proximity to the housing or inside the housing and supplying an electromagnetic wave to the non-contact type card; and a close position where the non-contact type card faces the loop antenna. A non-contact card confirmation device, comprising: a sensor for detecting the presence of the electromagnetic wave; and a transmission circuit for generating the electromagnetic wave for supplying power at least according to a detection signal of the sensor and transmitting the electromagnetic wave to the non-contact card. 2. The non-contact type card according to claim 1, wherein the non-contact type card is an IC card having a loop coil, and the sensor is provided on a surface of the housing inside a loop of the loop antenna. Card confirmation device. 3. The sensor according to claim 1, wherein the position of the close contact or close proximity is a distance from 0 to 5 cm with respect to the surface, and the sensor is an infrared sensor including a light emitting element and a light receiving element. 3. The non-contact type card confirmation device according to claim 2, wherein the non-contact type card confirmation device is arranged at a central portion inside the loop and has a detection sensitivity in the range of 0 to 5 cm.