JP2000275337A - Noncontact data transmitter-receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constitute a responder simply and at low costs and to transmit data for response to an interrogator at high quality. SOLUTION: Carrier waves 30a in which a prescribed-cycle signal is modulated by microwaves are transmitted from an interrogator 1. The carrier waves 30a are received by a reception part 22 in a responder 2. In a high-frequency- wave generation part 25, high-frequency waves which are used to transmit data for response to the interrogator 1 are generated from the prescribed-cycle signal contained in the carrier waves 30a, thereby synchronize the high-frequency waves with the operation of a control part 21 in the interrogator 1. Thus, the constitution of every circuit in the interrogator 1 which receives carrier waves 30b modulated by the generated high-frequency waves can make synchronous capture easy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of attaching an ID card to a tool or a luggage, or providing a person with a non-contact data transponder in a production line or a distribution line of a factory, entry / exit control of an office or the like. It relates to a device that communicates and manages data in a non-contact manner. A unique ID code, product number, and data at the time of manufacture are registered in the transponder, and the transponder is The present invention relates to a non-contact data transmission / reception device to be identified.

[0002]

2. Description of the Related Art FIG. 3 is a schematic diagram showing a general use state of an interrogator and a transponder. In FIG. 3, reference numeral 1 denotes an interrogator, and 2 denotes a response which communicates with the interrogator 1 in a communication area 3. It is a vessel. FIG. 4 is a block diagram showing a conventional non-contact data transmission / reception apparatus. In the interrogator 1, reference numeral 4 denotes an oscillating unit for generating a high frequency, and reference numeral 5 denotes interrogation data, and a reception response which will be described later. A control unit for determining data, a modulation unit 6 for modulating a high frequency with interrogation data, and a transmission unit 7 for transmitting the modulated high frequency as a carrier 20a. Reference numeral 8 denotes a receiving unit that receives the electromagnetic field 20b transmitted from the transponder 2, and 9 denotes a received electromagnetic field 2b.
A filter for filtering the signal 0b, an amplifier 10 for amplifying the filtered signal, and a demodulation unit 11 for demodulating response data from the amplified signal and outputting the data to the control unit 5.

[0003] In the transponder 2, reference numeral 12 denotes the interrogator 1.
A transmission / reception unit that receives the carrier wave 20a transmitted from the transmitter and transmits an electromagnetic field 20b to the interrogator 1, a power supply unit 13 rectifies and smoothes the received carrier wave 20a, and stores the power.
14 is a demodulator for demodulating interrogation data from the received carrier wave 20a, 15 is a controller for reading data corresponding to the demodulated interrogation data from the memory 16 and generating response data, and 17 is for generating a high frequency. A clock oscillation circuit 18 that divides a high frequency and controls the control unit 15 and others,
A frequency divider for supplying an operation clock in the transponder 2, 19
Is a code conversion unit that codes response data and causes the transmission / reception unit 12 to transmit the data to the electromagnetic field 20b.

FIG. 5 is a block diagram showing details of a transmission / reception section of a conventional contactless data transmission / reception apparatus. In the transmission / reception section 12, 12a and 12b are antennas and 12c.
Are '1', coded by the code conversion unit 19,
F that turns on and off according to the response data of '0'
ET. FIG. 6 is a waveform diagram showing transmission frames of the interrogator and transponder of the conventional non-contact data transmission / reception device, a waveform on the transmission unit of the interrogator, and a waveform on the transmission and reception unit of the transponder.

Next, the operation will be described. Generally, this kind of non-contact data transmission / reception device adopts a use state as shown in FIG. That is, the interrogator 1 has the communication area 3
When there is a transponder 2 inside, communication with the transponder 2 is performed. At this time, the control unit 5 of the interrogator 1 generates interrogation data such as a command or write data for reading or writing data in the memory 16 incorporated in the transponder 2, and modulates the data. 6 modulates the high frequency generated from the oscillating unit 4 with the interrogation data, and transmits the modulated high frequency as the carrier 20a by the transmitting unit 7. As a modulation method in the modulating unit 6, ASK (Amplitude Shift K) for changing the amplitude of a high frequency wave is used.
eyeing) is used. As the high frequency, a medium-long wave, a short wave, or a microwave capable of long-distance communication is used.

The transponder 2 receives the carrier 20 a transmitted from the interrogator 1 by the transmission / reception unit 12, rectifies and smoothes the received carrier 20 a, and stores the power in the power supply unit 13. The power stored in the power supply unit 13 is used for operation in the transponder 2. Further, the demodulation unit 14 detects the received carrier wave 20a by an enfolding line and demodulates interrogation data such as commands and data.

The controller 15 accesses the memory 16 according to the demodulated interrogation data, that is, the interrogation data from the interrogator 1. Here, when the transponder 2 does not receive the carrier wave 20 a from the interrogator 1, it cannot generate power from the power supply unit 13. Therefore, the memory 16 uses a nonvolatile memory such as an EEPROM. Further, the control unit 15 performs processing in synchronization with an operation clock obtained by dividing the high frequency generated by the clock oscillation circuit 17 by the frequency divider 18. The control unit 15
After performing command processing such as writing data to the memory 16 or reading data from the memory 16, response data is generated. The response data includes data read from the memory 16, a command processing result, and the like.

[0008] The code conversion section 19 includes a clock oscillation circuit 17.
The transmission / reception unit 12 encodes the response data using the clock generated by the above, and transmits the encoded response data to the interrogator 1 as the electromagnetic field 20b. Here, a CR oscillation circuit or a ring oscillator having a simple circuit configuration is used as the clock oscillation circuit 17. As a modulation method in the code conversion unit 19, FSK (Frequ
Ensky ShiftKeying) can be used, but ASK having a simple circuit configuration is effective.

FIG. 5 shows the details of the transmission / reception section 12 of the transponder 2. The transponder 2 is usually small, and it is desirable that each part of the transponder 2 is made up of inexpensive parts or that an IC is used to reduce the cost as much as possible. A high-precision crystal oscillator or the like cannot be mounted. Further, in the case of a crystal oscillator, the current consumption increases, and there is a possibility that the power consumption is higher than the power generated by the power supply unit 13. In this case, the operation is stopped.

As described above, instead of transmitting the carrier wave 20a modulated by the power supply (not shown) provided in the interrogator 1 like the interrogator 1, the non-modulation transmitted from the interrogator 1 is not performed. While always obtaining power using waves,
A transmission method is generally used. In that case, as shown in FIG. 6, the impedance of the antennas 12a and 12b is changed according to the high frequency from the code conversion unit 19. Since the high frequency from the code conversion unit 19 is a code including the response data of “1” and “0”, the antenna 12
The FET 12c connected to both ends of the terminals a and 12b is turned on and off. Thereby, the electromagnetic field 2 in the communication area 3
0b occurs, and the interrogator 1 can capture the change in the electromagnetic field 20b in the receiving unit 8. Note that F
The sign for turning on and off the ET 12c is a sufficient electromagnetic field 2
1b of one bit period to be transmitted so that a change of 0b occurs.
The cycle is about several times to several times (several kHz to several tens kHz). The code may be NRZ (Non-Return-Zero) as long as the code corresponds to “1” or “0” of the response data.

On the other hand, the signal of the electromagnetic field 20b captured by the receiving unit 8 of the interrogator 1 is filtered by the filter 9, amplified by the amplifier 10, demodulated as response data by the demodulating unit 11, and controlled by the control unit. At 5, the response data is determined. Since the electromagnetic field 20b transmitted from the transponder 2 is extremely weak, it is necessary to amplify the electromagnetic field 20b to a level that can be determined by the demodulation unit 11 by the amplifier 10. Signal may be amplified to other noises or the carrier wave 20a transmitted by the interrogator 1, so that a high-precision filter and a high-precision amplifier with a high amplification factor are required.
In addition, the communication distance is short because the change is weak in the electromagnetic field 20b.

FIG. 6 shows the transmission frames of the interrogator 1 and the transponder 2, the waveforms on the transmitter 7 of the interrogator 1, and the transponder 2
3 shows a waveform on the transmission / reception unit 12. At the start of transmission, the interrogator 1 transmits an unmodulated wave, causes the transponder 2 to generate power using the unmodulated wave, and sets the transponder 2 to an operating state (WAKE UP). Thereafter, the interrogator 1 transmits a start frame (STX) so that the transponder 2 can synchronize. The transponder 2 is synchronized with the data transmitted by the interrogator 1 by receiving the start frame, and is thus in a communicable state.

Thereafter, command data (CMD) is sent from the interrogator 1. The command data is a command for reading data from the memory 16 of the transponder 2 or writing data. If it is a data write command,
Send the data to be written after the command data. Thereafter, from the interrogator 1, a CRC (Cyclic Redundan) for checking whether or not the communication is normally performed.
cy Check) or an error code such as a sum check. Thereafter, the interrogator 1 transmits an unmodulated wave by RX, and sends the interrogator 1 to the transponder 2 using the unmodulated wave.
To generate power for transmission to

The transponder 2 receives the command data and the error code, calculates the error code, and, when judging that the communication has been completed normally, transmits a start frame (STX) and transmits a start frame (STX) in the data frame (DATA). Send response data. The transmission at this time is performed by the transmission / reception unit 12 shown in FIG.
And code conversion section 19, antennas 12a and 12b
Is changed according to the response data. When the FET 12c is turned on, the antennas 12a and 12b
When the impedance of the
Since the voltage between a and 12b is almost 0 V, the waveform on the transmission / reception unit 12 of the transponder 2 is as shown between data frames in FIG. Therefore, depending on the response data, the impedance often decreases, and during that time, almost no power can be taken, so that the power supply voltage becomes lower than the operable power supply voltage, and there is a possibility of stopping during the reply. Therefore, it is necessary to bring the transponder 2 close to the interrogator 1 to a distance where the power can be secured,
As a result, the communication distance becomes short.

[0015]

Since the conventional contactless data transmitting / receiving apparatus is configured as described above,
When transmitting the response data, the antennas 12a and 12b
, The communication distance between the interrogator 1 and the transponder 2 is short because of the change in the weak electromagnetic field 20b, and the interrogator 1 must determine the signal of the weak electromagnetic field 20b. In addition, the filter 9 and the amplifier 10 require a high-precision filter and a high-precision amplifier with a high amplification factor, which is expensive, and the transponder 2 requires the impedance of the antennas 12a and 12b to decrease during transmission. However, there has been a problem that a power supply required for the operation cannot be secured, and the communication distance is further shortened.

The transponder 2 receives the received carrier 2
0a, there is no concept of generating a high frequency for transmission to the interrogator 1 or an operating clock in the transponder 2 based on the received carrier wave 20a, which simplifies the configuration of the transponder 2. In addition, there is a problem that the data for response to the interrogator 1 cannot be transmitted with high quality.

Further, if the carrier wave 20a from the interrogator 1 to the transponder 2 is a microwave, the transmission efficiency is good and the communication distance can be extended, but the transponder 2 has a high frequency corresponding to the microwave. However, there is a problem that the configuration of the transponder 2 cannot be simplified or made inexpensive, since a device for use and a complicated circuit configuration are required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and can simplify the configuration of a transponder or reduce the cost thereof, and transmit high-quality response data to an interrogator. It is an object of the present invention to obtain a non-contact data transmission / reception device that can perform the operation.

[0019]

A non-contact data transmitting / receiving apparatus according to the present invention has a transponder provided with a high frequency generator for generating a high frequency for transmission based on interrogation data contained in a received carrier wave. Things.

The non-contact data transmission / reception device according to the present invention includes, in the interrogator, a modulator for modulating a high frequency with interrogation data and then modulating the high frequency with a predetermined period signal, and transmitting the modulated high frequency as a carrier wave. The transponder is provided with a high frequency generator for generating a high frequency for transmission based on a predetermined periodic signal included in the received carrier.

[0021] A non-contact data transmitting / receiving apparatus according to the present invention includes: a transponder having a clock generator for generating an operation clock in the transponder based on interrogation data and a predetermined period signal included in the received carrier; A modulating unit for modulating a high frequency for transmission with response data generated in accordance with an operation clock.

The non-contact data transmitting and receiving apparatus according to the present invention is characterized in that the interrogator modulates the amplitude of the microwave with interrogation data having a cycle of one hundredth or less of the cycle of the microwave and a predetermined cycle signal; A transmission unit for transmitting the amplitude-modulated microwave as a carrier; and a transponder having a receiving unit for receiving the carrier and detecting interrogation data and a predetermined period signal from the carrier.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a block diagram showing a contactless data transmitting / receiving apparatus according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 1 denotes an interrogator, 2 denotes a transponder, and 3 denotes a communication area. In the interrogator 1, reference numeral 4 denotes an oscillating unit for generating a high frequency of microwaves, reference numeral 21 denotes a control unit for generating a predetermined period signal after generating interrogation data, and determining a received response data described later; A modulation unit 7 modulates the microwave with a predetermined period signal after modulating the microwave with the interrogation data, and a transmission unit 7 that transmits the modulated microwave as a carrier 30a. Also,
8 is a receiving unit for receiving the carrier 30b transmitted from the transponder 2, 9 is a filter for filtering the high frequency component of the received carrier 30b, 10 is an amplifier for amplifying the filtered signal, and 11 is an amplifier for amplifying the signal. A demodulation unit that demodulates response data and outputs the data to the control unit 21.

In the transponder 2, reference numeral 22 denotes the interrogator 1.
A receiving unit that receives the carrier 30a transmitted from
The receiving unit 22 is provided with a detection diode that removes the frequency of the microwave from the microwave carrier wave 30a and drops the frequency component to the frequency component of the baseband signal. Reference numeral 13 denotes a power supply unit for rectifying and smoothing the converted frequency component of the baseband signal and storing the power, and 23 denotes a power supply of several μF.
A smoothing capacitor 14, a demodulation unit 14 for demodulating interrogation data and a predetermined period signal from the frequency component of the baseband signal, and 24 based on the demodulated interrogation data and the predetermined period signal in the transponder 2. A clock generation unit 15 that generates an operation clock is a control unit that reads data corresponding to the demodulated interrogation data from the memory 16 and generates response data. Further, reference numeral 25 denotes a high-frequency generation unit that demodulates a predetermined period signal from the frequency component of the baseband signal and generates a high frequency for transmission to the interrogator 1 based on the predetermined period signal. Is modulated by the response data, and the modulated high frequency is transmitted from the transmitting unit 27 as the carrier 30b. The transmitting unit 27 is not configured to slightly change the electromagnetic field 20b as in the transmitting and receiving unit 12 of the related art, but is configured to transmit a carrier wave 30b modulated with a high frequency as a radio wave.

FIG. 2 is a waveform diagram showing transmission / reception waveforms of respective main parts of the non-contact data transmission / reception device according to the first embodiment of the present invention, wherein A to E in FIG. It corresponds to the waveform of the section. FIG. 3 is a schematic diagram showing a general use state of an interrogator and a transponder also shown in the prior art. In the figure, 1 is an interrogator, 2 is a response which communicates with the interrogator 1 in a communication area 3. It is a vessel.

Next, the operation will be described. Generally, this kind of non-contact data transmission / reception device adopts a use state as shown in FIG. That is, the interrogator 1 has the communication area 3
When there is a transponder 2 inside, communication with the transponder 2 is performed. In FIG. 1, an interrogator 1 transmits a high-frequency carrier 30 a to a transponder 2 existing in a communication area 3. The high frequency transmitted by the interrogator 1 is, for example, amplitude-modulated to a microwave of about several GHz. The oscillator 4 of the interrogator 1 generates a microwave having a frequency of about 2 GHz and outputs the microwave to the modulator 6. At the same time, the control unit 21
It generates interrogation data of digital data of about several hundred kHz from z and outputs it to the modulator 6.

Here, the question data generated by the control unit 21 is a command or data to the transponder 2,
This is serial data of a pattern of “1” and “0”. In addition, encoding such as Manchester or biphase according to the pattern of “1” or “0” may be used. The command to the transponder 2 is a command such as reading data from the memory 16 in the transponder 2 or writing data as in the conventional example. Other instructions may be used. The modulator 6 modulates the amplitude of the microwave with the interrogation data of the digital data and outputs the modulated microwave to the transmitter 7, and the transmitter 7 transmits the amplitude-modulated microwave to the communication area 3 as the carrier 30a. In the case of a microwave, a horn antenna, a batch antenna, or the like is applied to the transmitting unit 7.
An antenna that matches the frequency of the carrier 30a to be transmitted is used.

The carrier 30a transmitted to the communication area 3
Is received by the receiving unit 22 of the transponder 2. Receiver 2
2 is composed of an antenna, but since the transponder 2 is desirably portable and inexpensive, a small antenna is effective. In particular, the use of microwaves of several GHz has the advantage that the antenna can be reduced in size because the wavelength is short. As described above, the transponder 2 is desirably small in size and inexpensive. For this purpose, it is effective to integrate the internal circuit of the transponder 2 into one chip on an IC. The demodulation circuit is very complicated and must be made up of high frequency elements, making it difficult to achieve miniaturization. Therefore, it is effective for the receiving unit 22 to reduce the frequency component to the baseband signal, that is, the frequency component of the interrogation data generated by the control unit 21 of the interrogator 1. In the first embodiment, since the carrier wave 30a from the interrogator 1 is a microwave amplitude modulation, it can be converted into a frequency component of interrogation data by passing through a detection diode. It is to be noted that the detection diode can be further miniaturized by being integrated into the same IC as other circuits in the transponder 2 and integrated into one chip.

The power supply unit 13 rectifies and smoothes the signal converted into the frequency component of the baseband signal by the rectifying and smoothing capacitor 23 and stores the power in the power supply unit 13. The power stored in the power supply unit 13 is used for operation in the transponder 2. Further, the demodulation unit 14 shapes the waveform of the signal converted into the frequency component of the baseband signal, and converts the encoded data into digital data of “1” and “0”. Then, the result is output to the control unit 15 and also to the clock generation unit 24. The clock generation unit 24 generates an internal operation clock of the transponder 2 synchronized with the digital data input from the demodulation unit 14.
Here, if the frequency of the operation clock is equal to or greater than the 1-bit data length, that is, the so-called bit rate, the control unit 15 can perform data determination.
In the first embodiment, it is assumed that the high-frequency generator 25 is not operating when interrogating data is transmitted from the interrogator 1 to the responder 2.

The control unit 15 reads data from the memory 16 and writes data according to the interrogation data from the interrogator 1. The control unit 15 also performs other controls. For example, in order for the interrogator 1 to communicate with a plurality of transponders, an ID number is added to the transmission frame, and the transponder 2 compares the ID numbers with those of the transponder. If they do not match, it is determined that the communication is not addressed to itself, and the subsequent control operation is stopped. It is to be noted that a unique ID number is previously stored in each responder at the time of manufacture or the like in the memory 16.
The ID number is read from the memory 16 for each communication. On the other hand, calculation of error codes such as CRC is also performed in order to improve communication reliability. The control unit 15 of the transponder 2 starts transmitting response data to the interrogator 1 after performing a series of processes on the interrogator data from the interrogator 1. The response data is stored in the memory 16
This corresponds to the data read from the command, the processing result according to the command data, and the like.

FIG. 2 shows a waveform in the communication area 3 at the time of transmitting the response data and a transmission waveform of each part in the transponder 2. When the transmission frame ends, the control unit 21 of the interrogator 1 generates a predetermined period signal, and the modulation unit 6
Is modulated by the predetermined period signal, and the transmitting unit 7 transmits the modulated microwave as the carrier 30a. FIG. 2A shows the waveform, in which a microwave of several GHz is amplitude-modulated by a predetermined period signal having a period of several hundred MHz.

The receiving unit 22 of the transponder 2 receives the carrier 30a in the same manner as when receiving the interrogation data, and converts the carrier 30a into a frequency component of a baseband signal by a detection diode. This baseband signal is output to the clock generation unit 24 via the power supply unit 13 and the demodulation unit 14, is similarly stored in power by the power supply unit 13, is shaped by the demodulation unit 14, and is similarly processed by the clock generation unit 24. An operation clock like the waveform C in FIG. 2 is generated. Further, the frequency component of the baseband signal is output to the high frequency generation unit 25, and the high frequency generation unit 25 shapes the waveform of the baseband signal and demodulates the original predetermined period signal as shown in FIG. The demodulation unit 2 uses the demodulated predetermined period signal as a high frequency for transmitting response data to the interrogator 1.
6 is output.

Since it is known that the transponder 2 performs the transmission process of the response data when the reception of the interrogation data is completed, the demodulation unit 14 performs the processing for the input predetermined period signal. It is also possible to perform control such that only waveform shaping is performed and waveform B is output without performing encoding conversion. Therefore, as long as the function is provided, the demodulation unit 14 and the high frequency generation unit 25 may be integrated. Thus, in the first embodiment, it is not necessary to mount the conventional clock oscillation circuit 17.

The control unit 15 sequentially synchronizes the response data as shown in FIG.
Output to Therefore, the bit rate of the response data transmitted from the transponder 2 is the cycle of the waveform C. Modulator 26
Generates a high frequency of a waveform E by amplitude-modulating the high frequency of the waveform B output from the high frequency generation unit 25 with the response data of the waveform D output by the control unit 15, and generates the high frequency of the waveform E. Output to the transmission unit 27. Transmission section 2
The transmitter 7 transmits the carrier 30b in the same manner as the transmitter 7 of the interrogator 1, but since the frequency is several hundred MHz, it is configured with an antenna suitable for the frequency. In the waveform E, amplitude modulation for generating presence / absence of amplitude in accordance with response data is used. However, frequency modulation for selecting a frequency for each response data, phase modulation for changing a phase for each response data, and the like are used. Alternatively, double modulation in which the above-described other modulation is superimposed on the amplitude modulation may be used, and these modulation methods are variable depending on the system.

The receiving section 8 of the interrogator 1 receives the carrier wave 30b, and performs filtering by the filter 9. Since the frequency of the high frequency from the transponder 2 is known, the filter 9 is set so as to capture the high frequency from the transponder 2 and is adjusted to the frequency of the waveform B. The output of the filter 9 is input to an amplifier 10 and the output of the amplifier 1
At 0, the signal is amplified to a level that can be demodulated by the demodulation unit 11. Here, in the first embodiment, unlike the conventional example, communication is not performed by changing the impedance of the antennas 12a and 12b by a weak change in the electromagnetic field 20b, but the high-frequency carrier 30b is transmitted from the transponder 2. Is transmitted and the carrier wave 30b is received, so that the transmission efficiency is good and the communication distance can be extended. Also,
Since the predetermined period signal transmitted from the interrogator 1 is used for the carrier wave 30b of the response data, the interrogator 1 can easily capture the response data synchronously. Interrogator 1 is amplifying unit 1
The signal amplified by 0 is demodulated into response data by the demodulation unit 11 and output to the control unit 21. The control unit 21 analyzes the response data from the transponder 2, for example, to the transponder 2. The determination is made by fetching the result of this command and the data in the memory 16 in the transponder 2, and a series of communication processing ends.

In the first embodiment, the high-frequency generator 25 generates the carrier wave 30a transmitted from the interrogator 1.
Although the high frequency for transmission is generated based on the predetermined periodic signal included therein, the high frequency generator 25 may generate the high frequency for transmission based on the interrogation data included in the carrier 30a. In this case, the control unit 21 of the interrogator 1
Thus, a process of generating a predetermined period signal from the above and a process of modulating with the predetermined period signal in the modulation unit 6 can be omitted. If the high-frequency generation unit 25 performs a process of extracting a predetermined cycle from the question data and circulating and continuing the extracted predetermined cycle, it can be used as a high frequency for transmission.

In the first embodiment, the carrier wave 30a transmitted from the interrogator 1 to the transponder 2 is a microwave, but it may be a short wave of several MHz or a medium-long wave of several kHz.

As described above, according to the first embodiment, the oscillator 4 of the interrogator 1 generates a microwave, and the modulator 6 converts the microwave into the interrogation data generated by the controller 21. And modulated by the predetermined period signal, and transmitted as the carrier wave 30a by the transmission unit 7,
The communication distance between the interrogator 1 and the transponder 2 can be increased, and noise can be suppressed, and transmission can be performed with high accuracy.

Further, in the receiving section 22 of the transponder 2, a detecting diode for detecting the received microwave carrier wave 30a and converting it into the frequency component of the baseband signal is provided. Since there is no need to process high-frequency waves at the microwave level and no high-frequency element is required thereafter, the circuit configuration in the transponder 2 can be configured inexpensively and easily, and a general CMOS IC
It becomes possible to make one chip by the process.

Further, in the transponder 2, the transmission / reception unit 12 of the conventional example is configured differently from the reception unit 22 and the transmission unit 27. Therefore, the power supply unit 13 of the transponder 2 includes the carrier wave 30a from the interrogator 1. While it is being received, it can always store electricity,
The shortage of the power supply in the conventional example can be solved.

Further, the clock generation section 24 can divide the interrogation data and the predetermined period signal demodulated by the demodulation section 14 to generate an operation clock in the transponder 2, so that the clock oscillation of the conventional example can be performed. The circuit 17 can be eliminated, and the circuit configuration can be simplified.
Further, since the control unit 15 performs processing in synchronization with the operation clock generated by the clock generation unit 24,
The response data generated from the control unit 15 is synchronized with the operation of the control unit 21 of the interrogator 1, and therefore, the synchronization acquisition when the response data is received by the control unit 21 of the interrogator 1 Can be facilitated.

Further, the high-frequency generation unit 25 includes a carrier 30
Since the high frequency for transmitting the response data to the interrogator 1 can be generated from the interrogation data and the predetermined period signal included in a, the clock oscillation circuit 17 of the conventional example can be eliminated, The configuration can be simplified. Further, the generated high frequency is transmitted to the control unit 2 of the interrogator 1.
1 is synchronized with the operation of the interrogator 1, and each circuit configuration of the interrogator 1 that receives the carrier 30b modulated by the generated high frequency can facilitate synchronization acquisition.

Further, since the carrier wave 30b modulated with a high frequency is transmitted from the transmission unit 27 of the transponder 2, the power received by the reception unit 8 of the interrogator 1 is large, and the response data to the interrogator 1 is transmitted. Can be transmitted with high quality.
Further, unlike the conventional example, it is not necessary to determine the signal of the weak electromagnetic field 20b, and the filter 9 and the amplifier 10 do not need to be high-precision and expensive. Further, the communication distance between the interrogator 1 and the responder 2 can be increased.

[0044]

As described above, according to the present invention, the transponder is provided with the high frequency generator for generating the high frequency for transmission based on the interrogation data contained in the received carrier. In addition, the clock oscillation circuit in the transponder can be eliminated, and the circuit configuration can be simplified and the cost can be reduced. Further, the high frequency generated by the high frequency generator becomes synchronized with the operation of the interrogator, and therefore, each circuit configuration of the interrogator that receives the carrier wave modulated by the generated high frequency can easily acquire the synchronization. The effect that can be obtained is obtained.

According to the present invention, the interrogator is provided with a modulator for modulating the high frequency with the interrogation data, and then modulating the high frequency with the predetermined period signal. The modulated high frequency is transmitted as a carrier, and the interrogator is transmitted to the transponder. Since the high frequency generator is configured to generate a high frequency for transmission based on a predetermined periodic signal included in the received carrier, the high frequency generator can perform desired waveform shaping only on the predetermined periodic signal from the carrier. The transmission high frequency can be generated, and the high frequency generation unit can have an effect of simplifying the circuit configuration and reducing the cost.

According to the present invention, a clock generator for generating an operation clock in the transponder based on the interrogation data and the predetermined period signal included in the received carrier wave is provided to the transponder; Since a modulation unit for modulating with response data generated in accordance with the operation clock is provided, a clock oscillation circuit can be eliminated, and the circuit configuration can be simplified or inexpensive. Further, in the transponder, processing is performed in synchronization with the operation clock generated by the clock generation unit, so that the response data transmitted from the transponder is synchronized with the operation of the interrogator. This has the effect of facilitating synchronization acquisition when the response data of the device is received.

According to the present invention, the interrogator modulates the amplitude of the microwave with the interrogation data having a cycle of one-hundredth or less of the cycle of the microwave and the predetermined cycle signal, and the amplitude-modulated section. And a transmitting unit for transmitting microwaves as a carrier, the transponder receives the carrier,
Since the receiver is configured to detect interrogation data and a predetermined period signal from the carrier wave, the communication distance between the interrogator and the transponder can be increased by using the microwave. In addition, the carrier wave transmitted from the interrogator is amplitude-modulated and detected by the receiving unit of the transponder, so that the circuit configuration in the transponder does not need to process the microwave-level high frequency thereafter, and the high-frequency element is used. Since there is no need to use such a circuit, the circuit configuration in the transponder can be inexpensively and simply configured, and an effect that one chip can be formed by a general CMOS IC process is obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a contactless data transmitting / receiving apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a waveform chart showing transmission / reception waveforms of respective main parts of the contactless data transmission / reception device according to the first embodiment of the present invention.

FIG. 3 is a schematic diagram showing a general use state of an interrogator and a transponder.

FIG. 4 is a block diagram showing a conventional non-contact data transmission / reception device.

FIG. 5 is a block diagram showing details of a transmission / reception unit of a conventional contactless data transmission / reception device.

FIG. 6 shows a transmission frame of an interrogator and a transponder of a conventional non-contact data transmission / reception device, a waveform on a transmission unit of the interrogator,
FIG. 7 is a waveform diagram showing waveforms on a transmitting and receiving unit of the transponder.

[Explanation of symbols]

1 Interrogator, 2 Transponder, 6, 26 Modulator, 7 Transmitter, 22 Receiver, 24 Clock Generator, 25 High Frequency Generator, 30a Carrier.

Claims (4)

[Claims] An interrogator for modulating a high frequency with interrogation data and transmitting the modulated high frequency as a carrier.
Receiving the carrier from the interrogator, demodulating the interrogation data from the carrier, modulating the transmission high frequency with response data corresponding to the interrogation data, and transmitting the modulated high frequency to the interrogator The transponder includes a high-frequency generation unit that generates a high-frequency signal for transmission based on the interrogation data included in the received carrier wave. Non-contact data transmission / reception device. 2. An interrogator for modulating a high frequency with interrogation data and transmitting the modulated high frequency as a carrier.
Receiving the carrier from the interrogator, demodulating the interrogation data from the carrier, modulating the transmission high frequency with response data corresponding to the interrogation data, and transmitting the modulated high frequency to the interrogator In the non-contact data transmitting and receiving device having a transponder, the interrogator, after modulating the high frequency by the interrogation data, comprises a modulator for modulating the high frequency by a predetermined periodic signal, the modulated high frequency as a carrier wave A non-contact data transmission / reception device for transmitting, wherein the transponder includes a high frequency generator for generating a high frequency for transmission based on a predetermined periodic signal included in a received carrier wave. 3. A transponder, comprising: a clock generator for generating an operation clock in the transponder based on interrogation data and a predetermined period signal included in the received carrier; 3. A non-contact data transmission / reception device according to claim 2, further comprising: a modulation unit that modulates the data with response data generated in accordance with (1). 4. An interrogator, comprising: a modulator for amplitude-modulating a microwave with interrogation data having a cycle of one hundredth or less of the cycle of the microwave and a predetermined cycle signal; A transmitting unit that transmits a wave as a carrier, and the transponder includes a receiving unit that receives the carrier transmitted by the transmitting unit and detects interrogation data and a predetermined period signal from the received carrier. The non-contact data transmission / reception device according to claim 2 or 3, wherein: