JP2009250849A - Unwanted radiation measurement apparatus, reader/writer apparatus, and unwanted radiation measurement method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To possibly prevent an inconvenience that a noncontact wireless communication between a RFID tag and a reader/writer section is interrupted by a movement location of a to-be-tested machine provided with the RFID tag and a distance between the reader/writer section, and always enable a stable unwanted radiation measurement. <P>SOLUTION: While a communication interruption (a communication error) is detected in the noncontact wireless communication between the RFID tag provided in a cellular phone 1 as the to-be-tested machine and the reader/writer section 3, a magnetic material 5 is inserted between the RFID tag and the reader/writer section 3 through a magnetic material movement mechanism 6. A communication dead zone (a null point) is shifted. The inconvenience that the noncontact wireless communication between the RFID tag in the cellular phone 1 and the reader/writers section 3 is interrupted by the movement location of the cellular phone 1 and the distance between the reader/writer section 3 is possibly prevented. The unwanted radiation is always and stably measured. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an RFID tag (RFID: Radio Frequency IDentification) and a reader / writer unit provided in a mobile terminal device such as a mobile phone, a PHS phone (PHS: Personal Handyphone System), and a PDA device (PDA: Personal Digital Assistant). The present invention relates to an unnecessary radiation measuring device, a reader / writer device, and an unnecessary radiation measuring method for measuring unnecessary radiation generated during non-contact wireless communication between the two.

  Today, RFID tags (RFID: Radio Frequency IDentification) that perform contactless wireless communication between a minute electronic chip in which ID information (ID: IDentification) is recorded and a reader / writer device and exchange the ID information are known. It has been.

  This RFID tag is largely divided into an active RFID tag that has a built-in battery and periodically transmits radio waves, and a passive RFID tag that does not require a battery and is excited when it is close to a reader / writer device to transmit radio waves. Separated. While the active RFID tag can extend the communication distance to several tens of meters, it is difficult to reduce the size and cannot be used when the battery life is exceeded. On the other hand, the passive RFID tag has a communicable distance of about several meters at the maximum, but has an advantage that it can be easily downsized and can be used semipermanently.

  The mobile RFID devices that are widely used today are often provided with the above-mentioned passive RFID tags. However, when any RFID tag is provided on the mobile phone, when the RFID tag is provided on the mobile phone. In addition, it is necessary to measure unnecessary radiation (spurious) generated during non-contact wireless communication with the reader / writer device by using the unnecessary radiation measuring device, and to adjust the transmission output from the RFID tag.

  FIG. 4A is a diagram schematically showing how unnecessary radiation is measured by this unwanted radiation measuring apparatus. As can be seen from FIG. 4 (a), this unwanted radiation measuring apparatus includes an arm unit 101 that three-dimensionally moves and scans a mobile phone 100 provided with an RFID tag, and a mobile phone 100 (= device under test). The reader / writer unit 102 performs non-contact wireless communication with the provided RFID tag, and the spectrum analyzer 103 for monitoring unnecessary radiation of the mobile phone 100.

  In such an unnecessary radiation measuring apparatus, the mobile phone 100 as a device under test is set on the arm unit 101, and the mobile phone 100 is moved three-dimensionally while the RFID tag and the reader provided on the mobile phone 100 are moved. Non-contact wireless communication is performed with the writer unit 102, and unnecessary radiation generated by the non-contact wireless communication is measured by the spectrum analyzer 103. And based on this measurement result, the three-dimensional position etc. with the largest unnecessary radiation are specified.

  In Japanese Patent Laid-Open No. 2001-311756 (Patent Document 1), in a field distribution measuring apparatus that continuously scans a probe and measures a spatial distribution of an electric field or a magnetic field, the probe travel position and measurement are measured. A field distribution measuring device capable of removing measurement noise generated due to a deviation from timing is disclosed. In the case of this field distribution measuring device, when measuring the spatial distribution of the electric field or magnetic field by measuring at a plurality of sampling points while continuously scanning the probe, there is a difference between the probe position and the measurement timing. The sampling deviation amount is calculated based on the spurious spectrum generated by, and the electric field or magnetic field distribution is measured in consideration of this deviation amount.

Japanese Patent Laid-Open No. 2001-311756 (5th page, FIG. 1 and FIG. 2)

  However, in the conventional unwanted radiation measurement device, the non-contact wireless communication between the mobile phone 100 and the reader / writer unit 102 is blocked depending on the moving position of the mobile phone 100 or the distance between the reader / writer unit 102, As shown in FIG. 4B, a communication error occurs. A measurement value of unnecessary radiation measured by the spectrum analyzer 103 while the non-contact wireless communication between the mobile phone 100 and the reader / writer unit 102 is interrupted becomes an invalid measurement value as a measurement value. Therefore, the conventional unnecessary radiation measuring apparatus is difficult to measure the unnecessary radiation from beginning to end because such non-contact wireless communication is interrupted during the measurement.

  The present invention has been made in view of the above-described problems, and the distance between the RFID tag and the reader / writer unit depends on the moving position of the EUT provided with the RFID tag and the distance between the reader / writer unit. It is an object of the present invention to provide an unnecessary radiation measuring device, a reader / writer device, and an unnecessary radiation measuring method capable of preventing the inconvenience of non-contact wireless communication from being interrupted as much as possible and enabling stable measurement of unnecessary radiation from beginning to end.

In order to solve the above-mentioned problem, the unwanted radiation measuring apparatus according to the present invention is
A device under test moving scanning unit that scans a device under test provided with an RFID tag (RFID: Radio Frequency IDentification) two-dimensionally or three-dimensionally;
A reader / writer unit that performs non-contact wireless communication with the RFID tag provided in the device under test;
An unnecessary radiation detector for detecting unnecessary radiation generated during non-contact wireless communication between the RFID tag provided in the device under test and the reader / writer unit;
A communication error detection unit for detecting a communication error of non-contact wireless communication between the RFID tag provided in the device under test and the reader / writer unit;
While the communication error is detected by the communication error detection unit, a magnetic material insertion unit for inserting a magnetic material is provided between the RFID tag provided in the device under test and the reader / writer unit.

In order to solve the above-mentioned problem, the reader / writer device according to the present invention provides:
Non-contact wireless communication that performs non-contact wireless communication with a device under test provided with an RFID tag (RFID: Radio Frequency IDentification) that is two-dimensionally or three-dimensionally moved and scanned by the moving unit under test. A communication department;
A communication error detection unit for detecting a communication error of non-contact wireless communication between the RFID tag provided in the device under test and the reader / writer unit;
While the communication error is detected by the communication error detection unit, a magnetic material insertion unit for inserting a magnetic material is provided between the RFID tag provided in the device under test and the reader / writer unit.

In addition, the method for measuring unwanted radiation according to the present invention includes a device under test provided with an RFID tag (RFID: Radio Frequency IDentification) that is moved and scanned two-dimensionally or three-dimensionally. An unnecessary radiation measurement method for detecting unnecessary radiation generated during non-contact wireless communication between an RFID tag and a reader / writer unit.
A step of detecting a communication error of non-contact wireless communication between the RFID tag provided in the device under test and the reader / writer unit;
While the communication error is detected by the communication error detection unit in the step, the magnetic material insertion unit inserts the magnetic material between the RFID tag provided in the machine under test and the reader / writer unit. And have.

  In the present invention as described above, while communication interruption (communication error) is detected in non-contact wireless communication between the RFID tag provided in the device under test and the reader / writer unit (or non-contact wireless communication unit), A non-communication area (null point) is shifted by inserting a magnetic material between the RFID tag and the reader / writer unit.

  As a result, it is possible to prevent as much as possible the disadvantage of non-contact wireless communication between the RFID tag of the device under test and the reader / writer unit being blocked due to the movement position of the device under test and the distance between the reader / writer unit. It is possible to measure the stable unnecessary radiation from beginning to end.

  The present invention eliminates the inconvenience that non-contact wireless communication between the RFID tag and the reader / writer unit is blocked by the moving position of the EUT provided with the RFID tag and the distance between the reader / writer unit. Therefore, it is possible to measure stable unnecessary radiation from beginning to end.

[First Embodiment]
The present invention can be applied to an unnecessary radiation device that measures unnecessary radiation between an RFID tag provided on a mobile phone and a reader / writer unit.

[Configuration of unnecessary radiation equipment]
In FIG. 1, the schematic diagram of the unnecessary radiation apparatus used as this embodiment is shown. As shown in FIG. 1, the unnecessary radiation device includes an arm unit 2 that three-dimensionally moves and scans a mobile phone 1 provided with a passive RFID tag (or an active RFID tag), and a mobile phone 1 (= A reader / writer unit 3 that performs non-contact wireless communication with an RFID tag provided in a device under test) and a spectrum analyzer 4 for monitoring unnecessary radiation of the mobile phone 1.

  The unnecessary radiation device includes a moving mechanism for the magnetic body 5, and communicates from the reader / writer section 3 with the magnetic body moving mechanism 6 for inserting the magnetic body 5 between the mobile phone 1 and the reader / writer section 3. A personal computer device 7 that drives and controls the magnetic body moving mechanism 6 so that the magnetic body 5 is inserted between the mobile phone 1 and the reader / writer unit 3 while the error signal is supplied; Yes.

The magnetic body 5 has a substantially rectangular flat plate shape, and has an area that can cover the entire contactless wireless communication antenna 8 disposed along the outer periphery of the casing of the reader / writer unit 3.

[Operation of unnecessary radiation equipment]
In such an unnecessary radiation measuring apparatus, the mobile phone 1 which is a device under test is set on the arm unit 2, and the mobile phone 1 is moved three-dimensionally (or may be two-dimensional). Non-contact wireless communication is performed between the RFID tag provided in 1 and the reader / writer unit 3. Unnecessary radiation generated in this non-contact wireless communication is measured by the spectrum analyzer 4, and a three-dimensional position or the like having the largest unnecessary radiation is specified based on the measurement result.

  Here, when the mobile phone 1 is three-dimensionally moved and scanned by the arm unit 2 in this manner, the mobile phone 1 and the reader / writer unit 3 may depend on the moving position of the mobile phone 1 and the distance between the reader / writer unit 3. The non-contact wireless communication with is interrupted, and a communication error occurs. Information indicating this communication error is supplied to the personal computer device 7, and when the information indicating the communication error is supplied from the reader / writer unit 3, the personal computer device 7 and the reader / writer unit 3. The magnetic body moving mechanism 6 is driven and controlled so that the magnetic body 5 is inserted between the magnetic body moving mechanism 6 and the magnetic body moving mechanism 6.

  FIG. 2A is a diagram showing the relationship between the movement position of the mobile phone 1 and the number of communication errors in “before insertion” of the magnetic body 5, and FIG. It is a figure which shows the relationship between the movement position of the mobile telephone 1, and the number of communication errors in "after." The numerical values “0” and “10” shown in FIGS. 2A and 2B are numerical values indicating the number of occurrences of communication errors. That is, it shows that the contactless wireless communication between the RFID tag of the mobile phone 1 and the reader / writer unit 3 is blocked at the moving position where the numerical value “10” is generated.

  Next, I would like you to compare FIG. 2 (a) and FIG. 2 (b). The “before insertion” of the magnetic body 5 shown in FIG. 2 (a) and the magnetic property shown in FIG. 2 (b). In the “after insertion” of the body 5, it can be seen that there is a shift in the movement position of the mobile phone 1 in which a communication error occurs.

  That is, by inserting the magnetic body 5 between the RFID tag of the mobile phone 1 and the reader / writer unit 3, it can be seen that a non-communication area (null point) that is a point of occurrence of a communication error is shifted. This is because insertion of the magnetic body 5 changes the L component (inductor component) of the non-contact wireless communication antenna 8 of the reader / writer unit 3 that is a coil, and it is carried from the housing of the metal reader / writer unit 3. This is because the influence on the telephone 1 (machine under test) is alleviated.

Therefore, when a communication error occurs, the contactless wireless communication between the RFID tag and the reader / writer unit 3 is performed by inserting the magnetic body 5 between the RFID tag of the mobile phone 1 and the reader / writer unit 3. Can be maintained in a good non-contact wireless communication state, and the RFID tag and the reader / writer unit 3 can be connected to each other depending on the moving position of the mobile phone 1 provided with the RFID tag and the distance between the reader / writer unit 3. It is possible to prevent the inconvenience of non-contact wireless communication between them as much as possible, and to enable stable measurement of unnecessary radiation from start to finish.

[Effect of the first embodiment]
As is clear from the above description, the unnecessary radiation device of the first embodiment is in the state where a communication error occurs in the non-contact wireless communication between the RFID tag of the mobile phone 1 and the reader / writer unit 3. The magnetic body 5 is inserted between the RFID tag and the reader / writer unit 3. As a result, the non-communication area can be shifted to maintain good non-contact wireless communication, and stable unnecessary radiation can be measured from start to finish.

[Second Embodiment]
Next, a second embodiment to which the present invention is applied will be described. The first embodiment described above is an example in which the present invention is applied to an unnecessary radiation apparatus, but the second embodiment is an example in which the present invention is applied to a reader / writer apparatus.

[Configuration of Reader / Writer Device]
FIG. 3 is a schematic diagram of a reader / writer device according to the second embodiment. As shown in FIG. 3, this reader / writer device performs non-contact radio communication with a passive RFID tag provided on a mobile phone 1 that is three-dimensionally moved and scanned by an arm unit 2. A communication error detection unit 13 that detects a communication error between the antenna 11 and the non-contact wireless communication unit 12 and the passive RFID tag, and a passive RFID tag while the communication error detection unit 13 detects a communication error A magnetic body moving mechanism 14 for inserting the above-described magnetic body 5 is provided between the reader / writer device.

As described above, the spectrum analyzer 4 monitors unnecessary radiation generated when the reader / writer device and the passive RFID tag of the mobile phone 1 perform non-contact wireless communication. Further, the magnetic body 5 has a substantially rectangular flat plate shape, and has an area that can cover the entire contactless wireless communication antenna 11.

[Operation of Reader / Writer Device]
In such a reader / writer device, a mobile phone 1 which is a device under test is set on an arm unit 2, and the RFID provided on the mobile phone 1 is moved while moving the mobile phone 1 two-dimensionally or three-dimensionally. Contactless wireless communication is performed between the tag and the contactless wireless communication unit 12. Unnecessary radiation generated in this non-contact wireless communication is measured by the spectrum analyzer 4, and a three-dimensional position or the like having the largest unnecessary radiation is specified based on the measurement result.

  Here, when the mobile phone 1 is moved and scanned three-dimensionally by the arm unit 2 in this way, depending on the moving position of the mobile phone 1 and the distance from the non-contact wireless communication unit 12, the mobile phone 1 is not in contact with the mobile phone 1. Non-contact wireless communication with the wireless communication unit 12 is interrupted and a communication error occurs. While the communication error is occurring, the communication error detection unit 13 supplies communication error information indicating that the communication error is occurring to the magnetic body moving mechanism 14.

While the communication error information is supplied, the magnetic body moving mechanism 14 inserts the magnetic body 5 between the passive RFID tag of the mobile phone 1 and the reader / writer unit 3. Thereby, similarly to the above, the non-communication area (null point) can be shifted, and depending on the moving position of the mobile phone 1 provided with the RFID tag and the distance to the non-contact wireless communication unit 12, It is possible to prevent inconvenience that the non-contact wireless communication between the RFID tag and the non-contact wireless communication unit 12 is blocked as much as possible, and to measure the stable unnecessary radiation from beginning to end.

[Effect of the second embodiment]
As is apparent from the above description, the reader / writer device according to the second embodiment generates a communication error in the contactless wireless communication between the RFID tag of the mobile phone 1 and the contactless wireless communication unit 12. The magnetic body 5 is inserted between the RFID tag and the non-contact wireless communication unit 12 while the wireless tag is in contact. As a result, the non-communication area can be shifted to maintain good non-contact wireless communication, and stable unnecessary radiation can be measured from start to finish.

In the reader / writer device according to the second embodiment, the communication error detector 13 and the magnetic body moving mechanism 14 are integrated on the reader / writer device side. The system to be performed can be configured by the arm unit 2, the reader / writer device, and the spectrum analyzer 4, and the configuration of the system that measures unnecessary radiation can be simplified.

[Modification]
In each of the above-described embodiments, the magnetic body 5 is inserted so as to cover the entire contactless wireless communication antenna. However, the magnetic body 5 may be inserted so as to cover a part of the contactless wireless communication antenna. . In this way, by changing the position and range where the magnetic body 5 is inserted, it is possible to change the shift amount or the like of the communication impossible area described above. Therefore, by changing the position and range where the magnetic body 5 is inserted, it is possible to measure the unnecessary radiation while adjusting the shift amount of the above-mentioned communication impossible area.

  Further, in the description of each of the above-described embodiments, it is assumed that unnecessary radiation at the time of non-contact wireless communication between the RFID tag provided on the mobile phone and the reader / writer unit 3 or the non-contact wireless communication unit 12 is measured. As described above, in addition to this, an RFID tag provided in a portable terminal device such as a PHS phone (PHS: Personal Handyphone System), a PDA device (PDA: Personal Digital Assistant), and the reader / writer unit 3 or contactless wireless communication You may make it measure the unnecessary radiation at the time of the non-contact wireless communication between the parts 12. In either case, the same effect as described above can be obtained.

  Finally, the present invention is not limited to the above-described embodiments described as examples, and various modifications can be made depending on the design or the like as long as they do not depart from the technical idea of the present invention. I will add that it is of course.

It is a figure for demonstrating the unnecessary radiation measuring apparatus used as 1st Embodiment to which this invention is applied. It is a figure for demonstrating the shift operation of the communication impossible area of the unnecessary radiation measuring device in the mobile telephone of embodiment. It is a figure for demonstrating the reader / writer apparatus which becomes 2nd Embodiment to which this invention is applied. It is a figure for demonstrating the conventional unnecessary radiation measuring apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Mobile phone, 2 Arm part, 3 Reader / writer part, 4 Spectrum analyzer, 5 Magnetic body, 6 Magnetic body moving mechanism, 7 Personal computer apparatus, 8 Non-contact wireless communication antenna of reader / writer part, 11 Non-contact wireless communication antenna, 12 contactless wireless communication unit, 13 communication error detection unit, 14 magnetic body moving mechanism

Claims (5)

A device under test moving scanning unit that scans a device under test provided with an RFID tag (RFID: Radio Frequency IDentification) two-dimensionally or three-dimensionally;
A reader / writer unit that performs non-contact wireless communication with the RFID tag provided in the device under test;
An unnecessary radiation detector for detecting unnecessary radiation generated during non-contact wireless communication between the RFID tag provided in the device under test and the reader / writer unit;
A communication error detection unit for detecting a communication error of non-contact wireless communication between the RFID tag provided in the device under test and the reader / writer unit;
While the communication error is detected by the communication error detection unit, there is no need to have a magnetic material insertion unit for inserting a magnetic material between the RFID tag provided on the device under test and the reader / writer unit. Radiation measurement device. The magnetic material insertion unit is configured such that the magnetic material of a size that covers the entire non-contact wireless communication antenna provided in the reader / writer unit is connected between the RFID tag provided in the device under test and the reader / writer unit. The unwanted radiation measuring apparatus according to claim 1, wherein the unnecessary radiation measuring apparatus is inserted between them. Non-contact wireless communication that performs non-contact wireless communication with a device under test provided with an RFID tag (RFID: Radio Frequency IDentification) that is two-dimensionally or three-dimensionally moved and scanned by the moving unit under test. A communication department;
A communication error detection unit for detecting a communication error of non-contact wireless communication between the RFID tag provided in the device under test and the reader / writer unit;
While the communication error is detected by the communication error detection unit, a reader having a magnetic material insertion unit for inserting a magnetic material between the RFID tag provided in the device under test and the reader / writer unit. Writer device. The magnetic body insertion portion includes a magnetic body having a size covering the entire contactless wireless communication antenna provided in the contactless wireless communication portion, an RFID tag provided in the device under test, and the contactless wireless communication device. The reader / writer device according to claim 3, wherein the reader / writer device is inserted between the communication unit. Non-contact between the RFID tag and the reader / writer unit provided on the device under test, where the device under test provided with the RFID tag (RFID: Radio Frequency IDentification) is moved two-dimensionally or three-dimensionally. An unwanted radiation measurement method for detecting unwanted radiation generated during wireless communication,
A step of detecting a communication error of non-contact wireless communication between the RFID tag provided in the device under test and the reader / writer unit;
While the communication error is detected by the communication error detection unit in the step, the magnetic material insertion unit inserts the magnetic material between the RFID tag provided in the machine under test and the reader / writer unit. And a method for measuring unnecessary radiation.

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