JPH07154289A - Data carrier system - Google Patents

Abstract

PURPOSE:To attain system normal communication by differentiating return timings from respective responders so as to allow an interrogator to locate from which a reply comes even when plural responders are in existence within a communication available zone. CONSTITUTION:A high frequency power (interrogation wave) sent from an interrogator 20m is received by an antenna 31 of a responder 30 in a data carrier system 10. Then the responder 30 uses a power of the interrogation wave to activate an internal circuit and a radio wave (reply wave) extended by preset information is returned to the interrogator 20 to make communication. The data carrier system allows the interrogator 20 to send N-sets of interrogation waves sequentially corresponding to N sets of the responders 30 in the lump. Then the transmission timing from each responder 30 is differentiated from the interrogation waves in the order of transmission to each responder 30. Thus, simultaneous communication with the plural responders 30 within a communication available zone is attained by the interrogator 20.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to data carrier systems.

[0002]

2. Description of the Related Art Conventionally, JP-A-52-150937 and JP-A-5-150937
As described in Japanese Patent No. 4-147082, there is a data carrier system in which a response radio wave including identification information transmitted from a transponder is received by an interrogator and communication is performed in a contactless manner.

[0003]

However, in the prior art, although there is no problem when there is a single responder within the communicable range, when there are a plurality of responders, as shown in FIG. Since the radio waves (response waves) transmitted from the transponders (for example, the transponders 1 and 2) are temporally simultaneous to the interrogator, the interrogator side identifies which transponder is the response. There is a problem that it cannot be recognized as normal data.

According to the present invention, even when a plurality of transponders are present within the communicable range, it is possible to specify (discriminate) from which transponder the reply is made and to enable normal communication. To aim.

[0005]

The present invention according to claim 1 uses an interrogator that transmits high-frequency power as an interrogation wave of an electromagnetic wave, and transmission power from the interrogator that is received by an antenna and uses the power. In a data carrier system having a responder for activating an internal circuit and returning a response wave of a radio wave modulated by internal information to the interrogator, N corresponding to N responders from the interrogator. The individual inquiry waves are sequentially and collectively transmitted, and the response timing from each responder is varied in the transmission order of the inquiry waves corresponding to each responder.

According to a second aspect of the present invention, an interrogator that transmits high-frequency power as an interrogation wave of an electromagnetic wave, and transmission power from the interrogator is received by an antenna, and the power is used to operate an internal circuit, In a data carrier system having a responder for returning a response wave of a radio wave modulated by internal information to an interrogator, each of the N responders has a different response frequency of the response wave, The interrogator is designed so that the frequencies of the returned response waves can be separated.

[0007]

According to the present invention described in claim 1, there is the following effect (1). (1) Figure 1 shows the transmission timing of radio waves for three transponders. The interrogator transmits three radio waves (interrogation wave) as a block.

The responder 1 returns a reply (response wave) after the first radio wave (), the reply device 2 returns a reply (response wave) after the second radio wave (), and the responder 3 Returns a reply (response wave) after the third radio wave ().

The interrogator can receive the radio wave (response wave) from each responder while the transmission of the radio wave is stopped.

As described above, since the response timing from each responder is different, it is possible for the interrogator side to specify (discriminate) from which responder the response is made.

When there are N transponders, N radio waves from the interrogator may be transmitted as one block.

According to the present invention described in claim 2,
It has the function of (2). (2) As shown in FIG. 3, the response frequency of the transponder 1 is f1,
Since the reply frequency of the responder 2 is different, such as f2, the reply frequency from the responder is different. Therefore, by providing a frequency separation circuit on the interrogator side, the interrogator side receives the reply at the same time. However, it is possible to specify (discriminate) from which responder the reply is.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a waveform diagram showing transmission timings of interrogation waves and response waves in the first embodiment, FIG. 2 is a block diagram showing interrogators and transponders in the first embodiment, and FIG. 3 is a second embodiment. Waveform diagram showing transmission timing of interrogation wave and response wave in FIG.
5 is a block diagram showing an interrogator and a responder of the second embodiment, FIG.
FIG. 7 is a waveform diagram showing transmission timings of an interrogation wave and a response wave in a conventional example.

First Embodiment (FIGS. 1 and 2) The data carrier system 10 has a plurality of (N) responders 30 for one interrogator 20, as shown in FIG. Composed.

The interrogator 20 receives a transmitting circuit section 21 for generating a high frequency, an antenna 22 for outputting a high frequency (interrogation wave) to the outside, and an electric wave (response wave) from the outside (responder 30). It has a receiving circuit section 23 that detects radio waves, a control circuit section 24 that controls the overall operation, and a power supply circuit section 25 that supplies power to each section.

The transponder 30 rectifies the high frequency (interrogation wave) received and transmitted by the antenna 31 and rectifies the received high frequency (interrogation wave) to the power supply circuit section 33, and also rectifies the presence of the interrogation wave to the control circuit section 35. It has a circuit section 32, a power supply circuit section 33 that supplies rectified power to each section, a transmission circuit section 34 that generates a set frequency, and a control circuit section 35 that controls the overall operation.

The data carrier system 10 includes an interrogator 2
The high frequency power (interrogation wave) transmitted from 0 is received by the antenna 31 of the responder 30. Then, the transponder 30 is
The internal circuit is operated using the power of the interrogation wave, and a radio wave (response wave) extended by the information already set is returned to the interrogation wave 20 for communication.

At this time, in the data carrier system 10, the interrogator 20 transmits N interrogation waves corresponding to each of the N transponders 30 sequentially and as a block. Further, the response timing from each responder 30 is made different in the transmission order of the interrogation wave corresponding to each responder 30.

Therefore, the data carrier system 10 operates as follows. (A) (1) First high frequency power from the interrogator 20 (interrogation wave)
Will be sent.

(2) Each responder 30 receives high frequency power from the antenna 31.

The rectifier circuit section 32 rectifies the high frequency power and transmits it to the power supply circuit section 33, and also informs the control circuit section 35 that there is an interrogation wave.

The power circuit section 33 supplies necessary power to each section.

The memory (initial value 0) in the control circuit section 35 is incremented by "1" and then stored.

(3) The transmission of the interrogator 20 stops.

(4) Each responder 30 compares its own number with "1" stored in the control circuit section 35, and if they are the same, the data stored in the control circuit section 35 is sent to the transmission circuit section 34. And returns a radio wave (response wave) from the antenna 31.

The responder 1 starts transmission because the comparison results in the control circuit section 35 are the same.

(5) The interrogator 20 receives the response wave at the antenna 22, detects it at the reception circuit section 23, and transmits it to the control circuit section 24.

The control circuit section 24 makes it possible to know that there is a reply from the responder 1.

(B) (1) The interrogator 20 transmits the second high-frequency power (interrogation wave).

(2) Each responder 30 receives high frequency power from the antenna 31. The rectifier circuit unit 32 rectifies the high frequency power and transmits it to the power supply circuit unit 33, and also informs the control circuit unit 35 that there is an interrogation wave.

The power supply circuit unit 33 continues to supply the necessary power to each unit.

The memory storage value "1" in the control circuit section 35 is incremented and then stored again.

(3) The transmission of the interrogator 20 stops.

(4) Each responder 30 compares its own number with "2" stored in the control circuit section 35, and if they are the same, the data stored in the control circuit section 35 is sent to the transmission circuit section 34. And returns a radio wave (response wave) from the antenna 31.

The responder 2 starts the transmission because the comparison results in the control circuit section 35 are the same.

(5) The interrogator 20 receives the response wave at the antenna 22, detects it at the reception circuit section 23, and transmits it to the control circuit section 24.

The control circuit section 24 can know that the reply from the responder 2 has been received.

(C) Similarly, the interrogator 20 transmits the third high-frequency power (interrogation wave), and "3" is stored in the memory in the control circuit section 35 of each responder 30.

The responders 1 and 2 do not transmit because they are different from their own numbers.

Therefore, the interrogator 20 knows that the responder 3 is not within the communication range.

On the external interface of the interrogator 20, it can be displayed (display, LED, voice, etc.) that the responder 3 is not within the communication range.

The memory value of each transponder is reset to "0" before the next interrogation wave mass arrives.

That is, according to the data carrier system 10, the interrogator 20 can be simultaneously operated with a plurality of transponders 30 within the communicable range by changing the return timing of the radio wave (response wave) sent back for each transponder 30. Communication becomes possible. That is, even if a plurality of transponders 30 exist within the communicable range,
Normal communication is possible.

(Second Embodiment) (FIGS. 3 and 4) The data carrier system 40 includes one interrogator 5 as shown in FIG.
For 0, a plurality of (N) responders 60 are provided.

The interrogator 50 includes a transmitting circuit section 51 for generating a high frequency, an antenna 52 for outputting the high frequency (interrogation wave) to the outside and receiving a radio wave from the outside (responder), and a received radio wave (response wave). Frequency separating circuit 53 that separates each of the required frequencies, a receiving circuit unit 54 that detects the separated radio waves, a control circuit unit 55 that controls the overall operation, and a power supply circuit unit that supplies power to each unit. 56 and.

The transponder 60 includes an antenna 61 for receiving and transmitting a high frequency, a rectifying circuit section 62 for rectifying the received high frequency (interrogation wave), a power supply circuit section 63 for supplying rectified power to each section, It has a transmission circuit section 64 that generates a set frequency and a control circuit section 65 that controls the overall operation.

The data carrier system 40 includes the interrogator 5
The high frequency power (interrogation wave) transmitted by
It is received by the antenna 61. And the transponder 60
Operates the internal circuit using the power of the interrogation wave, returns the response wave of the radio wave modulated by the already set information to the interrogator 50, and performs communication.

At this time, in the data carrier system 40, the N responders 60 have different response frequencies of the response waves, and the frequency separating circuit 53 of the response waves returned to the interrogator 50. Is provided.

Therefore, the data carrier system 40 operates as follows. (1) High frequency power (interrogation wave) is transmitted from the interrogator 50.

(2) Each responder 60 receives high frequency power from the antenna 61. It is rectified by the rectifier circuit unit 62 and transmitted to the power supply circuit unit 63. The power circuit section 63 supplies necessary power to each section.

(3) The transmission of the interrogator 50 stops.

(4) Each responder 60 sends the data stored in the control circuit section 65 to the transmission circuit section 64, and
Set the transmission frequency.

Radio waves (response waves) are returned from the antenna 61.

(5) The interrogator 50 receives the plurality of response waves returned by the antenna 51. The response wave received by the frequency separation circuit 53 is separated, and the reception circuit units 54A and 54A
Tell B.

The receiving circuit sections 54A and 54B detect the input signal and transmit it to the control circuit section 55.

The control circuit unit 55 can know which responder 60 has sent a reply.

The transponder 60 may be provided with a frequency setting switch.

If the frequency separating circuit 53 shifts the separating time for each frequency, the receiving circuit section 54 can be eliminated.

That is, according to the data carrier system 40, by changing the reply frequency for each responder 60 and providing the frequency sorting circuit 53 in the interrogator 50, the interrogator 50 has a plurality of responders 60 within the communication range. Allows simultaneous communication with. That is, even if there are a plurality of responders 60 within the communicable range and the reply timings to the interrogator 50 are the same, normal communication can be performed.

[0060]

As described above, according to the present invention, even when a plurality of transponders exist within the communicable range, it is possible to identify (discriminate) from which transponder the response is made and to make a normal operation. Communication can be enabled.

[Brief description of drawings]

FIG. 1 is a waveform diagram showing transmission timings of an inquiry wave and a response wave in the first embodiment.

FIG. 2 is a block diagram showing an interrogator and a responder of the first embodiment.

FIG. 3 is a waveform diagram showing transmission timings of an interrogation wave and a response wave in the second embodiment.

FIG. 4 is a block diagram showing an interrogator and a responder of a second embodiment.

FIG. 5 is a waveform diagram showing transmission timings of an interrogation wave and a response wave in a conventional example.

[Explanation of symbols]

 10, 40 Data carrier system 20, 50 Interrogator 21, 51 Transmission circuit unit 22, 52 Antenna 23, 54 Reception circuit unit 24, 55 Control circuit unit 25, 56 Power supply circuit unit 30, 60 Responder 31, 61 Antenna 32, 62 rectifier circuit section 33, 63 power supply circuit section 34, 64 transmission circuit section 35, 65 control circuit section 53 frequency sorting circuit

Claims (2)

[Claims] 1. An interrogator that transmits high-frequency power as an interrogation wave of an electromagnetic wave, and an electric wave that is transmitted by the interrogator and received by an antenna to operate an internal circuit to modulate the internal information. In the data carrier system having a response device for returning the response wave of the interrogator to the interrogator, N interrogation waves corresponding to each of the N responders are sequentially transmitted from the interrogator as a block, A data carrier system characterized in that the response timing from a responder is varied in the transmission order of interrogation waves corresponding to each responder. 2. An interrogator that transmits high-frequency power as an interrogation wave of an electromagnetic wave, and a radio wave that is modulated by internal information by receiving transmission power from the interrogator by an antenna and using the power to operate an internal circuit. In a data carrier system having a responder for returning the response wave of the response wave to the interrogator, each of the N responders has a different return frequency of the response wave, and the interrogator responds to the returned response wave. The data carrier system is characterized in that it is possible to discriminate the frequencies of.