JP3407598B2 - Contactless IC card system and reader / writer unit for contactless IC card - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact IC card system and a non-contact IC card reader / writer using a non-contact IC card capable of non-contact power supply and non-contact data communication. It is about units.

[0002]

2. Description of the Related Art FIG. 5 is an explanatory diagram showing an antenna arrangement example of a conventional room entry / exit management system using a non-contact IC card. In a conventional entrance / exit management system, an antenna 101 of a reader / writer unit (not shown) that wirelessly transmits power to a non-contact IC card and performs data communication with the non-contact IC card is provided with a door as shown in FIG. (Or gate) 102, or a non-contact IC card held by a person (or thing, animal, etc.) who enters and leaves the room by arranging it on the side of the door 102 as shown in FIG. 5B. I am trying to communicate with.

The reader / writer unit supplies electric power to the non-contact IC card side through the antenna 101 to contact the non-contact IC.
The card is made operable, and data communication is performed between the reader / writer unit and the non-contact IC card via the antenna 101.

FIG. 6 is an explanatory diagram of a configuration in which one antenna is used for both power transmission and data transmission, and FIG. 7 is an explanatory diagram of a configuration in which a power transmission antenna and a data transmission antenna are separately provided. Antenna 10 of reader / writer unit
As shown in FIG. 6, 1 has a configuration in which one antenna serves both as an antenna for power transmission and an antenna for data transmission, and as shown in FIG. 7, an antenna 101P for power transmission.
There is known a configuration in which two antennas are separately provided for the data transmission antenna 101D.

As shown in FIGS. 6 and 7, the antenna 101 of the reader / writer unit and the non-contact IC card 1
Power transmission and data transmission are performed by electromagnetic coupling with an antenna (not shown) provided on the 03 side.

[0006]

Generally, since the power for power transmission is larger than the power for data transmission, the electromagnetic wave for power transmission covers the antenna for data transmission and the receiving circuit for data transmission is saturated. This is one of the factors that cause a data transmission error because it is not possible to detect a slight change in electromagnetic waves of data transmission.

Further, in data transmission using a non-contact IC card, conditions such as distance are easily changed, and therefore retry is repeated until data is normally transmitted. Therefore, in the conventional method in which an error is likely to occur during data transmission, it takes a long time until the data transmission ends normally by repeating the retry.
If the non-contact IC card is not brought close to the antenna of the reader / writer unit, data transmission may not be normally performed.

FIG. 8 is an explanatory view showing a problem when the distance between the antenna and the non-contact IC card is short in the conventional method. As shown in FIG. 8, when the antenna 101 for power transmission and data transmission and the non-contact IC card 103 are close to each other, the non-contact IC card 103 can receive a large amount of electric power, and based on the large electric power. Since data can be transmitted, the power that can be output during data transmission can also be increased. However, since the antenna for transmitting data is also nearby, the power for data transmission is small and sufficient, and transmission with high power is unnecessary (wasted). Further, the receiving unit on the reader / writer unit side may not be able to receive data normally due to an excessive input level.

FIG. 9 is an explanatory view showing a problem when the distance between the antenna and the non-contact IC card is long in the conventional method. As shown in FIG. 9, when the distance between the antenna 101 for power transmission and data transmission and the non-contact IC card 103 is long, the power that the non-contact IC card 103 can receive becomes small. Therefore, the power that can be output during data transmission is also small. Since the distance between the data transmission antenna 101 and the non-contact IC card 103 is long, it is originally necessary to transmit data with a larger power, but because this is not possible, data cannot be transmitted accurately and a data transmission error occurs. May be.

The present invention is intended to solve the problem that a data transmission error occurs in a conventional system using such a non-contact IC card, or data cannot be normally transmitted unless the non-contact IC card is brought close to the antenna part. This is done by the reader / writer unit and the non-contact IC.
Non-contact IC that enables stable communication with the card
It is an object to provide a card system and a reader / writer unit for a non-contact IC card.

[0011]

In order to solve the above-mentioned problems, the present invention is directed to a non-contact IC car from a reader / writer unit.
Information transmission and power transmission to the
In the non-contact IC card system for sending data,
The reader / writer unit supplies power to the contactless IC card.
A power transmission antenna for wireless transmission, and the contactless I
Data transmission antenna for data transmission with C card
Is a reader / writer unit equipped with
The power transmission antenna is provided on one side of the passage of the IC card.
Is placed on the other side of the passing path.
Characterized by the placement of a tena.

Further , the present invention is a reader / writer unit.
Information to the non-contact IC card from
Contactless IC card system for communication and power transmission
In the reader / writer unit,
Power transmission antenna for wirelessly transmitting power to C card
And for performing data transmission with the contactless IC card
With a reader / writer unit equipped with a data transmission antenna
Yes, the power transmission antenna and the data transmission antenna
Within a range in which communication with the contactless IC card is possible.
At intervals of a constant place, by passing between the non-contact IC card and the <br/> power transmission antenna and the data transmission antenna, though the position of the non-contact IC card
It not, characterized by being configured to perform data communication with the power supply and the non-contact IC card to the contactless IC card.

[0013]

A contactless IC card system and a reader / writer unit for a contactless IC card according to the present invention include
When the non-contact IC card is close to the power transmission antenna (the non-contact IC card and the data transmission are performed, the power transmission antenna and the data transmission antenna are arranged at a predetermined interval and the antennas serve as a passage path of the non-contact IC card. When the distance from the antenna is long), a large amount of power can be supplied and data can be transmitted with a large amount of transmission power, so that data transmission can be performed reliably. When the distance between the non-contact IC card and the power transmission antenna is long (close to the non-contact IC card and the data transmission antenna), the power received by the non-contact IC card is small and the data transmission power is small. Since the distance between the non-contact IC card and the data transmission antenna is short, data transmission can be reliably performed. Therefore, stable data transmission is possible regardless of the position of the non-contact IC card.

Since the power transmission antenna and the data transmission antenna are spaced apart from each other, interference between the antennas is reduced. Therefore, data transmission can be reliably performed.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a system configuration diagram of a non-contact IC card system according to the present invention.
A non-contact IC card system 1 according to the present invention includes a non-contact IC card 2 and a non-contact IC card reader / writer unit (hereinafter referred to as a reader / writer unit) 3.
The reader / writer unit 3 includes a power transmission antenna 4, a data transmission antenna 5, and a reader / writer unit controller 6.
With.

FIG. 2 is an explanatory view showing the arrangement of the power transmission antenna and the data transmission antenna and the passage route of the non-contact IC card in the non-contact IC card system according to the present invention. As shown in FIG. 2, the non-contact type I according to the present invention
In the C card system 1, the power transmission antenna 4 and the data transmission antenna 5 are arranged at a predetermined interval, and each antenna 4,
The non-contact IC card 2 has a passage between 5 and 5.

For example, in a room entrance / exit management system using a non-contact IC card, a user having a non-contact IC card 2 has a power transmission antenna 4 and a data transmission antenna 5 arranged on both sides of a door or a gate, respectively. Each antenna 4, 5
It is configured to pass through the passage route between. Note that one antenna may be arranged above the passage (for example, the ceiling) and the other antenna may be arranged below the passage (for example, the floor).

By arranging the antennas 4 and 5 on both sides of the passage as described above, it is possible to eliminate the occurrence of a data transmission error due to the interference between the antennas. By arranging the antennas 4 and 5 apart from each other, the influence of electromagnetic waves between the antennas decreases in proportion to the square of the distance. As a result, the reliability of data transmission is improved. Also, the transmission time can be shortened by reducing the number of data transmission retries.

Furthermore, since the electric power output from the non-contact IC card 2 for data transmission becomes an appropriate electric power with respect to the distance from the data transmission antenna 5, the occurrence of data transmission errors is reduced. Therefore, stable data transmission is possible regardless of the position of the non-contact IC card 2 within the passage.

FIG. 3 is an explanatory view showing the operations of power transmission and data transmission when the non-contact IC card is near the power transmission antenna in the non-contact IC card system and the non-contact IC card reader / writer unit according to the present invention. Is. As shown in FIG. 3, when the non-contact IC card 2 is near the power transmission antenna 4 (far from the data transmission antenna 5), the non-contact IC card 2 can be supplied with a large amount of power. Therefore, the power for data transmission can be increased, and stable data transmission can be performed even if the distance between the non-contact IC card 2 and the data transmission antenna 5 is long.

FIG. 4 is an explanatory view showing the operations of power transmission and data transmission when the non-contact IC card is far from the power transmission antenna in the non-contact IC card system and the non-contact IC card reader / writer unit according to the present invention. Is. As shown in FIG. 4, when the non-contact IC card 2 is far from the power transmission antenna 4 (when it is near the data transmission antenna 5), the non-contact IC card 2 is supplied via the power transmission antenna 4. The power (which can receive power) is reduced. For this reason, the power for data transmission is also reduced, but since the distance between the non-contact IC card 2 and the data transmission antenna 5 is short, data communication is possible even with low power.

[0023]

As described above, in the non-contact IC card system and the non-contact IC card reader / writer unit according to the present invention, the power transmission antenna and the data transmission antenna are arranged at a predetermined interval, and the respective antennas are connected to each other. Since the contactless IC card is used as a passage path, when the contactless IC card is close to the power transmission antenna (when the distance between the noncontact IC card and the data transmission antenna is long), a large amount of power can be supplied. Since data can be transmitted with a large transmission power, data transmission can be reliably performed. When the distance between the non-contact IC card and the power transmission antenna is long (close to the non-contact IC card and the data transmission antenna), the power received by the non-contact IC card is small and the data transmission power is small. Since the distance between the non-contact IC card and the data transmission antenna is short, data transmission can be reliably performed.
Therefore, stable data transmission is possible regardless of the position of the non-contact IC card.

Furthermore, in the non-contact IC card system and the non-contact IC card reader / writer unit according to the present invention, the power transmission antenna and the data transmission antenna are spaced apart from each other, so that interference between the antennas is reduced. . Therefore, data transmission can be reliably performed.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of a non-contact IC card system according to the present invention.

FIG. 2 is an explanatory diagram showing an arrangement of a power transmission antenna and a data transmission antenna and a passage path of a non-contact IC card in the non-contact IC card system according to the present invention.

FIG. 3 is an explanatory diagram showing operations of power transmission and data transmission when the non-contact IC card is near the power transmission antenna in the non-contact IC card system and the non-contact IC card reader / writer unit according to the present invention. .

FIG. 4 is an explanatory diagram showing operations of power transmission and data transmission when the non-contact IC card is far from the power transmission antenna in the non-contact IC card system and the non-contact IC card reader / writer unit according to the present invention. .

FIG. 5 is an explanatory diagram showing an antenna arrangement example of a conventional entrance / exit management system using a non-contact IC card.

FIG. 6 is an explanatory diagram of a configuration in which one antenna is used for both power transmission and data transmission.

FIG. 7 is an explanatory diagram of a configuration in which a power transmission antenna and a data transmission antenna are separately provided.

FIG. 8 is an explanatory diagram showing a problem when the distance between the antenna and the non-contact IC card is short in the conventional method.

FIG. 9 is an explanatory diagram showing a problem when the distance between the antenna and the non-contact IC card is long in the conventional method.

[Explanation of symbols]

1 Non-contact IC card system 2 Non-contact IC card 3 Reader / writer unit 4 power transmission antenna 5 Data transmission antenna 6 Reader / writer unit controller

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuhiro Okada 3-14-20 Higashi-Nakano, Nakano-ku, Tokyo Kokusai Electric Co., Ltd. (72) Keisuke Igarashi 3-14-20 Higashi-Nakano, Nakano-ku, Tokyo Toki Denki Co., Ltd. (56) Reference JP-A-63-85995 (JP, A) JP-A-9-69142 (JP, A) JP-A-6-338831 (JP, A) (58) Fields investigated ( Int.Cl. ⁷ , DB name) H04B 5/00-5/02 G06K 17/00

Claims (2)

(57) [Claims] 1. A contactless IC card system in which information is communicated and power is transmitted from a reader / writer unit to a contactless IC card in a contactless manner, wherein the reader / writer unit supplies power to the contactless IC card. A reader / writer unit including a power transmission antenna for wireless transmission and a data transmission antenna for performing data transmission with the non-contact IC card, wherein the power is provided on one side of a passage path of the non-contact IC card. A non-contact type IC card system, wherein a transmission antenna is arranged and the data transmission antenna is arranged on the other side of the passage. 2. In a non-contact IC card system in which information is communicated and power is transmitted from the reader / writer unit to the non-contact IC card in a non-contact manner, the reader / writer unit supplies power to the non-contact IC card. A reader / writer unit comprising a power transmission antenna for wireless transmission and a non-contact IC card and a data transmission antenna for performing data transmission, wherein the power transmission antenna and the data transmission antenna are connected to the non-contact IC card. The contactless IC card is placed at a predetermined interval within a range where communication with the contactless IC card is possible, and the contactless IC card is passed between the power transmission antenna and the data transmission antenna, so that the contactless IC card can be placed at any position. Power supply to the contactless IC card and data communication with the contactless IC card. Contactless IC card system is characterized in that the Nau configuration.