JPH0665958U - Transceiver coil for contactless data carrier - Google Patents

Abstract

(57) [Abstract] [Purpose] A transmission / reception coil for a non-contact data carrier provided in a reader / writer for reading and writing the memory of the non-contact data carrier by data transmission by electromagnetic inductive coupling. Well, it is possible to deal with the expansion of the communication area in the vertical or horizontal direction. [Structure] Transmission / reception coil 1 of a non-contact data carrier which receives and reads a memory from a reader / writer by electromagnetic induction coupling
In addition, the semicircular portions 1a on both sides are connected by parallel straight line portions 1b to form a track field shape.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a transmission / reception coil for a non-contact data carrier provided in a reader / writer that reads and writes the memory of the non-contact data carrier by data transmission by electromagnetic induction coupling.

[0002]

[Prior art]

 Conventionally, as a transmission / reception coil for a non-contact data carrier of a reader / writer for reading / writing a memory provided in a non-contact data carrier by electromagnetic induction coupling, a circular coil 18 in FIG. 3 (a) and an elliptical coil in FIG. 3 (b) are used. A coil 19 or a rectangular coil 20 of Fig. 3 (c) is known.

[0003]

[Problems to be Solved by the Invention]

 However, the conventional circular coil 18 is easy to produce with good energy transmission efficiency, but there is a problem that the entire coil must be enlarged when the communication area is expanded vertically or horizontally. Further, the elliptical coil 19 has a high energy transmission efficiency and is good in that the communicable area in the vertical or horizontal direction can be widened, but it is difficult to produce and is disadvantageous in the manufacturing cost.

Further, although the rectangular coil 20 is easy to manufacture and may be used for expanding the communicable area in the vertical or horizontal direction, there is a problem that the efficiency of energy transmission is poor because the coil has a corner. The present invention has been made in view of such conventional problems, and is an optimum coil shape that is easy to create, has good energy transmission efficiency, and can cope with the expansion of the communication area in the vertical or horizontal direction. An object of the present invention is to provide a transmission / reception coil for a non-contact data carrier equipped with.

[0005]

[Means for Solving the Problems]

 In order to achieve this object, according to the present invention, a transmission / reception coil for a non-contact data carrier provided in a reader / writer for reading / writing a memory of a non-contact data carrier by electromagnetic induction coupling, which is a semicircular portion on both sides. It is characterized by having a track field shape formed by connecting parallel straight lines.

[0006]

[Action]

 According to the transmission / reception coil for non-contact data carrier having the track field shape of the present invention, the production is easy, the cost is not so different from the circular coil, the energy transmission efficiency is good, and the vertical or horizontal direction is good. The communication area can be expanded easily.

[0007]

【Example】

 FIG. 1 is an explanatory view of a reader / writer used for reading and writing a memory of a contactless data carrier having a transmitting / receiving coil of the present invention. In FIG. 1, a transmitter / receiver coil 1 and a circuit unit 4 are provided in a reader / writer 5. The transmitting and receiving coil 1 of the present invention has a semicircular portion 1a having a radius R on both sides, and the semicircular portion 1a is connected by a parallel straight portion 1b having a length L, which is a so-called track field known as an athletics track. It has a shape. Further, input / output terminals 2 and 3 are provided in a part of the transmission / reception coil 1, for example, the lower linear portion 1b, and the circuit unit 4 is electrically connected.

FIG. 2 is a block diagram showing an embodiment of the circuit unit 4 provided in the reader / writer 5 together with a data carrier. In FIG. 2, the reader / writer 5 is provided with a control unit 7, a writing unit 8, a reading unit 9, a transmitting / receiving unit 10, and a transmitting / receiving coil 1 having the track field shape shown in FIG. On the other hand, the data carrier 12 is provided with a transmission / reception coil 11, a transmission / reception unit 13, a control unit 14, a writing unit 15, a reading unit 16 and a memory 17.

The reader / writer 5 is fixedly installed, for example, as an automatic ticket gate, and the data carrier 12 serves as a commuter pass or a coupon ticket, and is carried by each user. If the reader / writer 5 is, for example, an automatic ticket gate, the communicable area with the data carrier 12 possessed by the user when passing through the automatic ticket gate needs to be expanded in the traveling direction of the user. is there.

Therefore, the transmission / reception coil 1 shown in FIG. 1 can have the length L of the straight portion 1b so as to secure a sufficient communicable area in the traveling direction required as a ticket gate. On the other hand, it is desirable that the transmission / reception coil 1 itself is as small as possible with respect to the expansion of the communicable area. Even if the length L of the straight line portion 1b is increased in FIG. 1, the radius R of the semicircular portions 1a on both sides is reduced. By doing so, the size can be sufficiently reduced in the direction perpendicular to the traveling direction.

The reading / writing operation of the memory 17 of the data carrier 12 by the reader / writer 5 in FIG. 2 is as follows. The reader / writer 5 is always in a standby state in which data communication with the data carrier 12 is possible, and the control unit 7 sends an access start command (I / O start) from the transmission / reception coil 1 at a constant cycle via the reading unit 9 and the transmission / reception unit 10. Command) is issued. Therefore, when the data carrier 12 enters the communication area of the reader / writer 5, the start command is received from the transmission / reception coil 11 and the transmission / reception unit 13 and given to the control unit 14, and the control unit 14 decodes the start command. Returns a response.

In response to the response from the data carrier 12, the control unit 7 of the reader / writer 5 executes a read access to the memory 17, for example, and checks whether or not there is a passage condition as a commuter pass or a coupon ticket. If the condition is met, the user is allowed to pass through. If the condition is not met, the gate of the automatic ticket gate is closed and an alarm message is issued. The writing unit 8 of the reader / writer 5 is used to write the usage result in the memory 17 when passing through an automatic ticket gate, for example. Further, when the reader / writer 5 is used as an issuer of the data carrier 12, it is used to rewrite and reissue the contents of the memory 17 of the collected data carrier 12.

Incidentally, the power supply of the data carrier 12 can be obtained by rectifying the reception signal of the transmission / reception coil 11, or may be one having a built-in battery. Further, it is desirable that the memory 17 is a non-volatile memory that can retain the stored contents even when the power is turned off, but a volatile memory with a built-in battery may be used. Furthermore, since the transmission power from the reader / writer 5 can be increased, normal FSK transmission is sufficient, but since the transmission power from the data carrier 12 to the reader / writer 5 is small, the S / N ratio can be increased by spread spectrum communication or the like. desirable.

Furthermore, in the embodiment of FIG. 1, the case where the transmission / reception coil 1 has one turn is taken as an example, but the number of coil turns can be appropriately determined as necessary. In addition, a wire may be wound as the transmission coil 1, or a coil pattern may be formed on the substrate. Furthermore, in the above-described embodiment, the automatic ticket gate is used as an example of the reader / writer, but in general, the data carrier 12 often moves with respect to the reader / writer 5, and the direction is also one direction. Therefore, it can be applied as it is to an appropriate reader / writer in which such a usage of the reader / writer is performed, and is not limited by the use of the reader / writer 5.

[0015]

[Effect of device]

 As described above, according to the present invention, like the circular coil, the manufacturing is easy and the cost is low, and it is suitable for increasing the communicable distance in the vertical or horizontal direction, which is the data carrier passage direction. Moreover, high energy transmission efficiency can be realized.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram of the circuit unit shown in FIG.

FIG. 3 is an explanatory view showing a conventional coil shape.

[Explanation of Codes] 1, 11: Transmitting / receiving coil 1a: Semicircular portion 1b: Straight portion 2, 3: Input / output terminal 4: Circuit unit 5: Package 6: Reader / writer 7, 14: Control portion 8, 18: Writing Part 9, 16: Read-out part 10, 13: Transmitter / receiver

Claims (1)

[Scope of utility model registration request] 1. A transmission / reception coil for a non-contact data carrier, which is provided in a reader / writer for reading and writing a memory of a non-contact data carrier by electromagnetic induction coupling, a track in which semicircular portions on both sides are connected by parallel straight portions. A transmission / reception coil for a non-contact data carrier, which has a field shape.