JPH061512B2 - Simultaneous identification system for multiple cards - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to simultaneous identification of a plurality of cards in a card identification system that reads information of a card in a contactless manner by using electromagnetic waves or the like so that a plurality of cards can be identified at the same time. There is something about the system.

BACKGROUND ART Conventionally, as shown in FIG. 3 (a), a card identification device (3)
From the card (1) to the card identification device (3), a reading device signal is emitted from the card (1) in the identification area (A) in a contactless manner.
There has been proposed a card identification system for reading the information of the card (1) in a contactless manner by a response signal returned to the contactlessly. As described above, in a system in which the information of the card (1) is read in a non-contact manner, there is an identification area (A) capable of communicating with the card (1), as shown in FIG. 3 (b). As you can see, there are multiple cards in this identification area (A)
(1), (2) If it occurs in a situation that exists, the fourth
As shown in the figure, a signal in response to the read signal from the card identification device (3) is simultaneously transmitted from each card (1), (2), and these signals are duplicated in the card identification device (3). Then, there was a problem that information could not be identified.

In order to prevent such an inconvenience, conventionally, the identification area is made small. This method is effective for applications such as monitoring the passage of people who carry cards, because multiple cards can never exist in the same narrow identification area at any one time. Had not been considered. However,
For example, when identifying a card inside a car,
In a situation where a plurality of cards are densely present in a narrow area for a relatively long time, there may be a case where a plurality of response signals are constantly returned to the card identification device. However, there is a problem that it becomes difficult to identify the card. Further, even in the above-mentioned application of monitoring the passage of a person who holds a card, when a plurality of people pass closely in line, a plurality of response signals are simultaneously returned to the card identification device, There was a problem that it became difficult to identify the card.

(Object of the Invention) The present invention has been made in view of the above points,
The purpose of the invention is to provide a simultaneous identification system for a plurality of cards so that even when there are a plurality of cards in the identification area, the response signal from each card can be received and the cards can be identified. It is in.

DISCLOSURE OF THE INVENTION In the simultaneous identification system for a plurality of cards according to the present invention, in order to solve the above problems, as shown in FIGS. 1 to 3, a card identification device (3 ) Emits a read signal to the cards (1) and (2) in the identification area (A) in a non-contact manner, and the cards (1) and (2) in a non-contact manner to the card identification device (3). In the card identification system that reads the information of the cards (1) and (2) in a contactless manner by the returned response signal, the read signal from the card identification device (3) for each of the plurality of cards (1) and (2) After the reception of, the response time zones for generating the response signal are set so as not to overlap each other.

That is, in the present invention, the order of generating the response signals is set for each of the plurality of cards so that the response signals do not overlap each other. The response time series is shown in FIG. As can be seen from this figure, the card (1) returns the corresponding signal immediately after receiving the read signal, but the card (2) is delayed by a time corresponding to the response time of the card (1), The response signal is returned so that it does not overlap with the response signal of 1). As described above, by setting the order in which the response signals are generated in each card so that the response signals do not overlap, a plurality of cards are provided in the identification area (A).
Even if (1) and (2) are present, the card identification device (3) can individually receive the respective response signals and can identify the card.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a block diagram showing an internal configuration example of a card (1) used in an embodiment of the present invention. The receiving antenna R _a receives the read signal from the card identification device (3), and the receiving circuit
Enter in (11). In the receiving circuit (11), the receiving antenna R _a
Received the read signal from the identification device (3) obtained by
After the reception is completed, a signal for starting the operation of the timer circuit (12) is generated. The timer circuit (12) is a response sequence memory (13)
The delay operation is performed only for the time set to, and when the time is up, a transmission start signal is given to the transmission circuit (15) to stop. With this transmission start signal, the transmission circuit (15) causes the identification number memory
The stored contents of (14) are transmitted from the transmitting antenna T _a and then stopped. The card (1) is driven by a lithium battery or the like, or a read signal from the card identification device (3) is detected to obtain driving power.

The card (1) is configured as described above, but FIG. 3 (b)
The card (2) shown in (1) has the same internal configuration as the card (1), and only the contents stored in the response sequence memory (13) and the identification number memory (14) are stored in the card (1). ) Is set to a different value. The number of cards (1) and (2) for which the response order is set is two in the embodiment, but the number is not limited to this.
It may be three or more.

Next, for the card identification device (3), after receiving the read signal, if there is a response signal for each of the plurality of response time zones, the response signal is received and demodulated, and the identification number included in the response signal is read. It is a thing. The read identification numbers are individually stored and output. Card Identification Device (3)
Is connected to various controllers. For example, when the read identification number matches a predetermined identification number, it is used by connecting to an unlocking device that unlocks the door. It is something. By using the system of this embodiment, it is possible to construct a card key system in which the door cannot be unlocked and the automobile engine cannot be started unless two cards (1) and (2) are present at the same time. Is.

In this embodiment, the time until the generation of the response signal is set by the stored data in the response sequence memory (13), but a switch or the like may be used instead of the response sequence memory (13). . Further, the reception antenna R _a and the transmission antenna T _a may be integrated into a transmission / reception antenna. Further, the response delay operation and the transmission / reception control operation as described above can be performed by the microcomputer in the card.

As described above, according to the present invention, even when a plurality of cards exist in the identification area of the card identification device,
The response signal of each card to the read signal from the card identification device is returned in a different response time zone from each other,
There is an effect that it is possible to realize a system capable of simultaneously identifying a plurality of cards existing in the identification area.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an internal configuration example of a card used in a simultaneous identification system for a plurality of cards according to an embodiment of the present invention, FIG. (A) and (b) are explanatory views showing a usage state of the above system, and FIG. 4 is an operation explanatory view of a conventional example. (1) and (2) are cards, and (3) is a card identification device.

Claims (1)

[Claims] 1. A card identification device emits a read signal to a card in an identification area in a contactless manner, and a response signal returned from the card to the card identification device in a contactless manner causes the card information to be contactless. In the card identification system for reading a plurality of cards, a response time zone for generating a response signal after receiving a read signal from each of the plurality of cards is set so as not to overlap each other. Simultaneous identification system.