JP2001244845A - Non-contact data transmission and reception system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that an installation space needs to be secured and power consumption increases when interrogators are provided on the doors of a locker since the antennas of the interrogators and transponders should be arranged one to one. SOLUTION: An interrogator is provided with an least one antenna, which is selected by an antenna switching circuit and connected to a transmitter or a receiver.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact data transmission / reception method for transmitting / receiving data between an interrogator provided on a locker side and a transponder carried by the user, for example, for locking / unlocking a locker door. About the system,

[0002]

2. Description of the Related Art FIG. 7 is a block diagram showing the structure of a conventional interrogator. This interrogator is provided at a door of each storage room of a locker having a large number of storage rooms. In the figure, the interrogator 101 includes a main control device 110, a transmission device 120, and a reception device 130. 102 is an antenna,
Reference numeral 103 denotes a transponder corresponding to the interrogator 101. The transponder 103 incorporates a coil for receiving a radio wave from the antenna 102 to induce a voltage, a transmitting device for transmitting its own ID data by the induced voltage, and the like. ing. Reference numeral 104 denotes a higher-level device such as a personal computer connected to the interrogator 101 via the transmission network 105.

The main controller 110 includes a memory 111,
It comprises a communication circuit 112 and a data control / arithmetic circuit 113 connected to the transmission network 105. The transmission device 120 includes a data modulation circuit 121, a power amplification circuit 12
2. With the high-frequency circuit 123, the receiving device 130
Is composed of a high frequency circuit 123 and a data demodulation circuit 131. The antenna 1 is connected to the high frequency circuit 123.
02 is connected.

Next, the operation will be described. Interrogator 101
The transmission data from the main control device 110
0 to the power amplifying circuit 12
2. The signal is transmitted from the antenna 102 to the transponder 103 in a non-contact manner via the high frequency circuit 123. The transponder 103 that has received the transmission data induces a voltage by the built-in coil, and transmits its own ID data from the built-in transmitting device using the induced voltage.

On the other hand, the interrogator 101 supplies ID data received from the transponder 103 by the antenna 102 to the data demodulation circuit 131 via the high frequency circuit 123 and demodulates the data. Arithmetic circuit 113
To control and calculate the data, and store the control and calculation results in the memory 1
11 is stored. The control / calculation result in the data control / calculation circuit 113 is transmitted to the host device 104 via the communication circuit 112. The host device 104 receives the supplied data, performs collation with the ID data, and locks or unlocks the locker door when they match.

[0006]

Since the conventional contactless data transmission / reception system is configured as described above, the antenna of the interrogator and the transponder must be arranged in a one-to-one relationship. Therefore, when the interrogators are provided on the doors of the plurality of storage rooms of the locker, the transponders need a space for securing a plurality of interrogators in a one-to-one correspondence. There were problems such as securing power supply and increasing power consumption with the installation of the interrogator.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a non-contact data transmission / reception system which realizes space saving and equipment cost reduction.

[0008]

A non-contact data transmission / reception system according to the present invention is a non-contact data transmission / reception system including an interrogator for transmitting and receiving data without contact with a plurality of transponders. A plurality of antennas corresponding to the transponder, an antenna switching circuit for sequentially selecting the antenna, a transmission device for supplying a transmission signal to the selected antenna, and a reception device for inputting a reception signal of the selected antenna, A main controller that controls the transmitting device, stores a received signal of the receiving device in a memory, and controls a sequence switching of the antenna switching circuit.

The antenna switching circuit of the non-contact data transmission / reception system according to the present invention is such that the antenna switching circuit connects the selected antenna to the transmitting device and the receiving device and does not connect other antennas. is there.

[0010] The antenna of the non-contact data transmission / reception system according to the present invention is constituted by a loop antenna.

The antenna of the non-contact data transmission / reception system according to the present invention is constituted by a resonance circuit having a combination of an inductance, a capacitor, and a resistor.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 shows an overall configuration diagram of a contactless data transmission / reception system according to a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes an interrogator provided for each locker having a large number of storage rooms; 2-n is an antenna provided on each of the storage room doors, and 3-1 to 3-n are antennas 2-1.
2 to 2 -n (see FIG. 2). The transponders 3-1 to 3-n receive a radio wave from the antennas 2-1 to 2-n and induce a voltage. It has a built-in transmitter and the like for transmitting its own ID data by induced voltage. Reference numeral 4 denotes a higher-level device such as a personal computer connected to the interrogator 1 via the transmission network 5.

FIG. 2 is a block diagram showing the structure of the interrogator 1. In the figure, the main controller 10 and the transmitter 2
0, a receiving device 30, and an antenna switching circuit 40 for selectively operating one of the antennas 2-1 to 2-n. The main control device 10 includes a memory 11 and a communication circuit 1 connected to the host device 4 via a transmission network 5.
2. Data control / arithmetic circuit 13

The transmission device 20 includes a data modulation circuit 21,
The power amplifier circuit 22 and the high-frequency circuit 23, and the receiving device 30 includes a high-frequency circuit 23 and a data demodulation circuit 31. The high frequency circuit 23 is provided on the common terminal (not shown) side of the antenna switching circuit 40, and the antennas 2-1 to 2-1 are provided on the plurality of switching terminals (not shown) side.
2-n are connected.

The antennas 2-1 to 2-n are the loop antenna shown in FIG. 3 or the capacitor C shown in FIG.
An antenna or the like composed of a resonance circuit combining an inductance L and a resistance R is used.

Next, the operation will be described. FIG. 5 shows that the main controller 10 of the interrogator 1 switches the antenna switching circuit 40 to sequentially select the antennas 2-1 to 2-n, and the antennas 2-1 to 2-n and the responders 3-1 to 3-3. FIG. 7 is a diagram illustrating a communication operation with −n over time.

First, in the interrogator 1, the main controller 10 controls the transmitter 20 to supply transmission data to the antenna switching circuit 40. In this state, the main controller 10 switches the antenna switching circuit 40 to 2-1 to 2-n are sequentially selected, and the transmission data is emitted as radio waves from the selected antenna.

In this state, the transponders 3-1 to 3-n
When a person with one of the above approaches the locker, the above radio wave acts on the coil in the transponder to induce a voltage in the coil,
The transmitter is operated based on the induced voltage, and the ID data specified by itself is transmitted.

On the other hand, the interrogator 1 receives the ID data by the selected antenna, demodulates the ID data by the data demodulation circuit 31 through the high-frequency circuit 23, and then controls the data control / arithmetic circuit of the main controller 10. At 13, data control / calculation is performed, and the control / calculation result is stored in the memory 11. The control / calculation result is transmitted to the host device 4 via the transmission network 5. The higher-level device 4 receives the supplied ID data, performs collation with the ID data stored in advance,
If they match, the locker door is locked or unlocked.
The same may be performed by the interrogator 1 itself.

The antenna selected by the antenna switching circuit 40 is connected to the transmitting device 20 and the receiving device 30, but the other antennas not selected by the antenna switching circuit 40 are connected to the transmitting device 20 and the receiving device. It is not connected to 30 and becomes inactive.

As shown in FIG. 6, the order in which the antennas 2-1 to 2-n are switched (the order in which the antennas are selected) is several orders, for example, (1) ascending order of antenna addresses, and (2) ascending order of antenna addresses. (3) descending order of antenna address (4) ascending order of antenna address, and then ascending order of odd number are stored in the memory 21 in the main control device 12, and in any order, It is previously selected whether to switch between 1 and 2-n.

[0022]

As described above, according to the present invention, at least one or more antennas are provided in the interrogator, and one of the antennas is selected by the antenna switching circuit to be electrically connected to the transmitting device and the receiving device. Since the configuration is such that one interrogator can be installed as much as possible, space can be saved. In addition, since it is not necessary to install interrogators corresponding to a plurality of transponders, there is an effect that facility cost can be reduced.

Further, according to the present invention, the antenna selected by the antenna switching circuit is connected to the transmitting device and the receiving device, and the other antennas are not connected. Perform in step 1. As a result, since communication with the transponder can be performed without mutual interference with the adjacent antenna, communication with the transponder is assured, and there is an effect that high reliability can be obtained.

Further, according to the present invention, the antenna is constituted by a loop antenna or a resonance circuit having a combination of an inductance, a capacitor, and a resistor. There is an effect that can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a contactless data transmission / reception system according to Embodiment 1 of the present invention.

FIG. 2 is a block diagram showing a configuration of an interrogator in the contactless data transmission / reception system.

FIG. 3 is a perspective view showing a loop antenna.

FIG. 4 is a resonance circuit diagram of the antenna.

FIG. 5 is a diagram showing a process performed by a main controller of the interrogator on a plurality of antennas over time.

FIG. 6 is an explanatory diagram showing an antenna switching order.

FIG. 7 is a configuration diagram of a conventional contactless data transmission / reception system.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Interrogator 2-1 to 2-n Antenna 3-1 to 3-n Transponder 4 Upper device 5 Transmission network 10 Main controller 11 Memory 12 Communication circuit 13 Data control / arithmetic circuit 20 Transmitter 21 Data modulation circuit 22 Power Amplifier circuit 23 High-frequency circuit 30 Receiver 31 Data demodulation circuit 101 Interrogator 102 Antenna 103 Transponder 104 Host device 110 Main controller 111 Memory 112 Communication circuit 113 Data control / arithmetic circuit 120 Transmission device 121 Data modulation circuit 122 Power amplification circuit 123 High frequency circuit 130 Receiver 131 Data demodulation circuit

Claims (4)

[Claims] 1. A non-contact data transmission / reception system including an interrogator for transmitting and receiving data to and from a plurality of transponders in a non-contact manner, wherein the interrogator sequentially selects a plurality of antennas corresponding to the transponders and the antennas. An antenna switching circuit, a transmitting device for supplying a transmission signal to a selected antenna, a receiving device for inputting a reception signal of the selected antenna, and a memory for controlling the transmission device and storing a reception signal of the reception device. And a main controller for controlling the order of switching of the antenna switching circuit. 2. The non-contact data transmission / reception system according to claim 1, wherein the antenna switching circuit connects the selected antenna to a transmitting device and a receiving device, and does not connect other antennas. 3. The contactless data transmission / reception system according to claim 1, wherein said antenna is a loop antenna. 4. The non-contact data transmission / reception system according to claim 1, wherein the antenna comprises a resonance circuit having a combination of an inductance, a capacitor, and a resistor.