JP2006148670A - Radio type data carrier write reading system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high performance radio type data carrier system which measures the exact intensity of the operating radio wave a radio type data carrier receives. <P>SOLUTION: A radio type data carrier 1 comprises an operating radio wave detection rectifier 4 for detecting and rectifying an operating radio wave 42 received by a radio data carrier antenna 2 as an operating power, an operating radio wave rectified voltage measuring unit 3 for measuring a voltage value generated by the operating radio wave detection rectifier 4, and a transmitter 7 for transmitting the measured value from the operating radio wave rectified voltage measuring unit 3 to a write reader 10. The write reader 10 comprises an operating radio wave rectified voltage measured value receiver 16 for receiving the measured value from the operating radio wave rectified voltage measuring unit 3 through a write reader antenna 11, and a display 14 for showing the measured value by the receiver 16 and various data. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a wireless data carrier writing / reading system for writing and reading data to and from a data carrier without contact.

  As a general usage of a wireless data carrier, a radio wave emitted from the wireless data carrier as an object to be read is received by a reader, the data is decoded, and an article attached with the wireless data carrier is used. To perform management, tracking, inspection, sorting, etc. Data is also written to the wireless data carrier in a non-contact manner by a writer using radio waves.

  Here, the wireless data carrier includes a battery type having a battery and a batteryless type that does not have a battery and operates by electric power sent from a reader or writer antenna by radio waves.

  The battery-less wireless data carrier generates a radio wave modulated by data written in the wireless data carrier, that is, a response radio wave, using power transmitted from the antenna as a radio wave. Subsequently, the reader receives the response radio wave to read data in the wireless data carrier.

  FIG. 6 shows a general example in which the wireless data carrier is read or written by conveying an article with the wireless data carrier attached thereto by a conveyor.

  For the wireless data carrier 1 to operate with respect to the wireless data carrier 1 on the article 41 conveyed to the left side of the drawing by the conveyor 40 from the writing reader antenna 11 connected to the writing reader 10 An operating radio wave 42 for supplying the electric power is emitted. The wireless data carrier 1 receives the operating radio wave 42 and generates power for operating the wireless data carrier 1 itself.

  When the wireless data carrier 1 is read, the response radio wave 43 modulated by the data or control information written in the wireless data carrier 1 is written via the write reader antenna 11 using the power. Returning to the reader 10 makes communication with the wireless data carrier 1.

JP-A-5-167471

  However, in a state where the operating radio wave 42 received by the wireless data carrier 1 is weak, the power obtained by the wireless data carrier 1 is reduced, and as a result, the wireless data carrier 1 cannot be operated completely. There are cases where reading and writing to the formula data carrier 1 cannot be performed.

  In particular, in the vicinity of the environment where the wireless data carrier is actually read and written, as shown in FIG. 6, a conveyor, a metal rack, and machinery for reflecting radio waves radiated from the write reader antenna 11 Many are installed. In such an environment, interference occurs due to the operation radio wave 42 transmitted from the write reader antenna 11 to the wireless data carrier 1 and the reflected wave from the metal installation, and the write reader antenna 11 transmits from the antenna. The place where the operating radio wave 42 is weakened occurs. As a result, as described above, there are cases where reading or writing becomes impossible or unstable.

  In the example shown in FIG. 6, the operating radio wave 42 is reflected by a metal plate that supports the conveyor belt 37 attached immediately below the conveyor belt 37 of the conveyor 40, and a reflected wave 44 is generated.

  In the investigation conducted by the present inventor, as shown in FIG. 7, the reflected wave 44 of the operating radio wave 42 by the reflector 50 and the operating radio wave 42 interfere with each other to generate a standing wave 47. The operation radio wave 42 becomes stronger at the antinode position 48, but the operation radio wave 42 becomes weaker at the node position 49. Therefore, when the wireless data carrier 1 is at the node position 49, reading becomes difficult.

  Further, a node position 49 is generated every ½ of the wavelength λ of the radio wave used for the operation radio wave 42 from the reflecting plate 50, and an antinode position 48 is first a position of ¼ of λ from the reflecting plate 50. And then every 1/2 of λ.

  Therefore, a place where the operation radio wave 42 transmitted from the writing / reading antenna 11 is searched is set so that reading or writing is performed at that position, or data reading or writing is actually performed with the wireless data carrier. It is necessary to change the installation position of the surrounding metal object so that the operation radio wave 42 becomes strong at the position where the insertion is performed.

  In this case, it is necessary to measure the intensity of the operating radio wave 42, but since the radio wave is invisible, a special measuring instrument such as an electric field strength meter is required to measure the intensity of the radio wave.

  Here, in a barcode reader that uses visible light instead of radio waves that are not visible to the eye, visible light is used to determine whether or not the light emitted by the barcode reader is strongly shining on the barcode label that is to be read. Therefore, it can be easily confirmed visually. Whether the return light of the light emitted from the barcode reader from the barcode label returns to the barcode reader is determined by whether the inclination of the barcode label with respect to the light emitted by the barcode reader falls within a specified angle. Just check to see if you have. This is because the reflectance with respect to the light of the label on which the barcode is printed is defined, and how much return light is returned is determined by the inclination of the label with respect to the barcode reader. In other words, any object containing metal on the side or back side of the bar code label is not related to reading.

  However, in the wireless data carrier, as described in the generation of the standing wave, the operation radio wave 42 radiated from the writing reader antenna 11 passes through the wireless data carrier 1 and passes through the wireless data carrier 1. Furthermore, interference occurs between the reflected wave from the metal installed far away and the reflected wave from the metal object installed on the side surface, and the radio wave intensity increases or decreases, so the wireless data carrier 1 passes. Depending on the location, reading and writing may be impossible or unstable, and it is impossible to see the state of such radio waves.

  Therefore, even if an object that absorbs radio waves instead of the object that reflects radio waves as described above is installed farther away from the wireless data carrier 1, reading is impossible even though it has been operating normally until yesterday. There is a case.

  On the other hand, when an object that reflects radio waves is installed in the surroundings, it is natural that the operation radio waves may be weakened due to interference of the reflected waves as described above, and reading may not be possible. On the contrary, there is a case where the radio wave is strengthened due to the interference of the reflected wave from the radio wave reflector farther away than the data carrier 1. In such a case, when the newspaper is accidentally read, when newspapers or the like are stacked behind the wireless data carrier 1, the radio waves radiated to the radio wave reflector and the reflected waves from the radio wave reflector are reflected. May absorb and weaken. As a result, the radio data carrier operating radio wave 42 incident on the radio data carrier 1 that has been strengthened due to interference is weakened, which may make reading and writing difficult.

  In addition, there is a case where the reading state is influenced by an object that absorbs radio waves installed at a position farther than a wireless data carrier as a reading object, which is not normally considered.

  In the barcode reader, reading is not affected by anything on the back side of the label. These differences are related to the radio wave used by the wireless data carrier being transmitted through the object and its wavelength.

  Since the radio data carrier uses radio waves, the operating radio wave passes through the radio data carrier, which is the object to be read, and further interferes with the reflected wave from the far radio wave reflector, as shown in FIG. The belly position 48 and the node position 49 shown in FIG.

  Here, as an example, when considering a wireless data carrier using radio waves having a frequency of 2.45 GHz, the wavelength of radio waves is about 12 cm, so the interval between the positions 49 of the nodes is about 6 cm. Here, since the size of the reading range for reading the wireless data carrier is generally several tens of centimeters, a plurality of regions where radio waves are weakened are generated in the reading range at intervals of about 6 cm. Then, reading and writing become difficult.

  Long-wave radio waves have long wavelengths, so the above-mentioned interval is long, and there is no longer a region where radio waves are weakened within the reading range. It becomes difficult to occur when it becomes difficult.

  As described above, in order to realize stable reading and writing with respect to the wireless data carrier 1, the wireless data is recorded by examining the arrangement of surrounding metal objects and the material of the article to which the wireless data carrier 1 is attached. Although it is indispensable to radiate more operation supply radio waves 4 to the carrier 1, as described above, conventionally, in order to measure the intensity of the operation supply radio waves 4, a special measuring instrument such as an electric field strength meter is used. Was necessary.

  Further, in order to measure the electric field strength of the radio data carrier operating radio wave 42 actually received by the radio data carrier 1, the antenna as a detector of the electric field strength meter is naturally placed at the position of the radio data carrier. It is necessary to install.

  However, the state of the operating radio wave 42 is disturbed by absorption and reflection of the operating radio wave 42 by the detector, the detector holding unit, the detector cable itself, etc. The measured value is different from the electric field strength received by the wireless data carrier in the state, and even if the electric field strength meter is prepared, the operation radio wave 42 actually received by the wireless data carrier 1 cannot be accurately measured. It was.

  Japanese Patent Laid-Open No. 5-167471 describes an embodiment in which the strength of radio waves from a wireless data carrier is measured by a field strength measuring circuit and the distance is determined by the field strength when read. The operating radio wave 42 changes rapidly due to reflection and absorption, and as a result, the intensity of the radio wave returned from the wireless data carrier also changes, so that the electric field intensity at the time of reading also changes. Is always under certain circumstances, or the environment changes variously, and for wireless data carriers on moving objects, some ingenuity is necessary to ensure the stability of the received electric field strength. It was.

  Accordingly, an object of the present invention is to provide a high-performance by enabling the accurate measurement of the operating radio wave received by the wireless data carrier itself when the wireless data carrier system is installed and installed or when the system is malfunctioning. Providing a wireless data carrier system, speeding up the introduction of the wireless data carrier system and reducing costs by easily and quickly determining the location of equipment that affects reading / writing of the wireless data carrier and the location of movement. It is to be realized.

  In addition, it is possible to quickly and easily determine whether the wireless data carrier system is operating properly by enabling real-time measurement of the strength of operating radio waves received by the wireless data carrier in the actual operating state of the wireless data carrier. Is to provide a simple wireless data carrier system.

  In order to achieve this object, a wireless data carrier according to the present invention includes an operation radio wave detection / rectification unit that detects and rectifies operation radio waves received from an external system such as a writing reader as operation power, and An operation radio voltage measuring unit that measures a voltage value of electric power and outputs the measured value, and a transmitting unit that sends the measured value to the external system are provided.

  In addition, a wireless data carrier antenna that receives operating radio waves and various data from an external system such as a writing reader, a receiving unit that receives various data from the external system via the wireless data carrier antenna, A data section in which various data received by the receiving section is written, a data writing / reading control section for controlling writing / reading of various data to / from the data section, and an operating radio wave received by the wireless data carrier antenna The operation radio wave detection and rectification unit for detecting and rectifying the operation power as the operation power, the operation radio voltage measurement unit for measuring the voltage value of the operation power and outputting the measurement value, and the measurement value and the data unit are written. And a transmitter for sending various data to the external system.

  The writing / reading device according to the present invention transmits operating radio waves and various data to a wireless data carrier, and also measures measured values and various data obtained by measuring voltage values of operating power from the wireless data carrier. The writing / reading device that receives the response radio wave has an operation radio wave rectified voltage measurement value reception unit that receives the measurement value from the response radio wave, and an output unit that outputs the received measurement value in a predetermined format. It is characterized by.

  The output unit is preferably display means for displaying the measurement value in a predetermined format.

  In addition, the writing / reading device according to the present invention transmits operating radio waves and various data to the wireless data carrier, and outputs measured values and various data obtained by measuring voltage values of operating power from the wireless data carrier. In the writing reader that receives as a response radio wave, a writing / reading control unit that controls the voltage measurement system of the writing reader, an external device connection unit that inputs and outputs various data between the external device, An operation radio wave rectified voltage measurement value reception unit that receives the measurement value from the response radio wave, and a display unit that displays the received measurement value in a predetermined format.

  Further, these writing / reading devices output an operating radio wave intensity margin output unit that outputs an operating radio wave intensity margin corresponding to the magnitude of the received measurement value, and an operation for adding the margin It is desirable to have a radio wave intensity margin adding unit for operation and an addition period designating unit for designating a period to be added by the operation radio wave intensity margin adding unit.

  Further, these writing / reading units are for operation radio wave intensity margin reference value setting unit for setting the reference value of the added margin, and for operation for determining and comparing the added margin and the reference value. It is desirable to have a radio wave margin determination unit.

  Further, these writing readers are a response radio wave detection rectification unit that detects and rectifies an AC voltage due to the response radio wave, a response radio wave rectification voltage measurement unit that measures a voltage value output from the response radio wave detection rectification unit, The response radio wave intensity margin output unit that inputs the measured value output from the response radio wave rectified voltage measurement unit and outputs the margin, and the margin output from the response radio wave intensity night margin output unit is specified for the addition period It is desirable to have a response radio wave intensity margin adding unit for adding a period specified by the unit.

  Furthermore, these writing / reading devices are provided with a response radio wave intensity margin reference value setting unit that sets a reference value of the margin added by the response radio wave intensity adding unit, and a margin added by the response radio wave intensity adding unit. And a comprehensive determination unit for comparing and determining the reference value set by the response radio wave intensity margin reference value setting unit.

  The wireless data carrier writing / reading system according to the present invention includes any of the wireless data carriers described above and any of the above-described writing readers.

  According to the present invention, it is possible to accurately and stably measure the strength of the operating radio wave received by the wireless data carrier itself and the response radio wave from the wireless data carrier when the wireless data carrier system is installed and installed or when the system is malfunctioning. Therefore, it is possible to provide a high-performance wireless data carrier system, and to easily and quickly determine the location of equipment that affects the reading / writing of the wireless data carrier and the location of movement. Speed of introduction of a data carrier system and cost reduction can be realized.

  In addition, it is possible to measure in real time the strength of the operating radio wave received by the wireless data carrier and the response radio wave from the wireless data carrier in the actual operating state of the wireless data carrier. It is possible to provide a wireless data carrier system that can quickly and easily determine the quality of an operation state.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 shows a first embodiment according to the present invention, which comprises a wireless data carrier 1 and a writing / reading device 10.

  The wireless data carrier 1 detects the operating radio wave 42 from the writing / reading device 10 and the radio data carrier antenna 2 that receives various data, and the operating radio wave 42 received by the radio data carrier antenna 2 as operating power. The operation radio wave rectification unit 4 for rectifying, the operation radio wave rectification voltage measurement unit 3 for measuring the voltage value generated in the operation radio wave detection rectification unit 4, and the measurement value from the operation radio wave rectification voltage measurement unit 3 Transmitter 7 for transmitting to writing / reading device 10, receiver 5 for receiving various data received by wireless data carrier antenna 2, data portion 8 to which data is written, and control of data writing to data portion 8 And a data writing unit 6 for performing the processing.

  The writing reader 10 also includes a writing reader antenna 11 and an operating radio rectified voltage measurement value receiving unit 16 that receives the measurement value of the operating radio rectified voltage measuring unit 3 via the writing reader antenna 11. A display 14 that displays the measurement values and various data received by the operating radio wave rectified voltage measurement value receiving unit 16, a write / read control unit 12 that performs control inside the write reader 10, and an external device. And an external device connection unit 13 for inputting / outputting various data such as read / write data and control information.

  In the present embodiment, the measurement value is displayed on the display unit 14; however, the measurement value may be output so that it can be recognized by some means, may be printed on a paper medium, or simply output to an external device. You can just do it.

  Next, the operation of the first embodiment will be described.

  First, the writing reader 10 radiates operating radio waves 42 via the writing reader antenna 11 in order to supply operating power to the wireless data carrier 1.

  When the wireless data carrier 1 receives the operation radio wave 42 from the wireless data carrier antenna 2, an operation voltage of the wireless data carrier 1 is generated, and this operation voltage is applied to the operation voltage detection / rectification unit 4. . The voltage generated in the wireless data carrier antenna 2 by the operating radio wave 42 becomes alternating current. In order to use this voltage as operating power for the wireless data carrier 1, it is detected and rectified by the operating voltage detector / rectifier 4 to convert alternating current into direct current.

  The voltage converted from alternating current to direct current is sent to each block in the wireless data carrier 1 as an operating voltage.

  Note that the power necessary for the operation of the wireless data carrier 1 appears as a voltage, not a power, in the circuit of the wireless data carrier 1, so that the operation power will be described as an operation voltage in the future.

  Subsequently, the voltage output from the operation radio wave detection rectification unit 4 is input to the operation radio wave rectification voltage measurement unit 3 and measured.

  Here, the actual magnitude of the voltage input from the operation radio wave detection rectification unit 4 to the operation radio wave rectification voltage measurement unit 3 is that of the block to which the voltage generated by the operation radio wave detection rectification unit 4 is applied. Depends on power consumption. That is, it is determined by the power consumption of the semiconductor elements constituting each block, but when the operating radio wave 42 received by the wireless data carrier antenna 2 is strong, the voltage generated by the operating radio wave detection rectifier 4 is When the operating power supply radio wave 42 is weak, the voltage generated by the operating radio wave detection / rectification unit 4 is low. This is the same as being able to see and hear better on TV and radio closer to the broadcast station. From the above, high and low voltages corresponding to the strength of the operating radio wave 42 received by the wireless data carrier antenna 2 are applied to the operating radio wave rectified voltage measuring unit 3.

  Here, the operating radio rectified voltage measuring unit 3 has a function of measuring an input voltage and outputting it as a digital value. Accordingly, when the digital value output from the operating radio wave rectified voltage measuring unit 3 is large, it indicates that the strong operating radio wave 42 is received, and when the digital value is small, the operating radio wave 42 is weak. Show. That is, it is possible to determine the strength or weakness of the operating radio wave 42 by determining the magnitude of the digital value.

  Then, the digital measurement value measured by the operating radio wave rectified voltage measuring unit 3 is transmitted to the writing reader 10 via the response radio wave 43 radiated from the wireless data carrier antenna 2 from the transmission unit 7.

  If the voltage level can be determined by an analog value, the operating radio wave rectified voltage measuring unit 3 may output an analog value.

  The digital measurement value transmitted via the response radio wave 43 is received by the operation radio wave rectified voltage measurement value receiving unit 16 via the writing / reader antenna 11, and the received digital measurement value is displayed in a predetermined format. 14 is displayed. As a result, the writing / reading device 10 can determine the strength of the operating radio wave 42 received by the wireless data carrier 1 from the received digital measurement value.

  The digital measurement value transmitted to the writing / reading device 10 may be transmitted alone by a request from the writing / reading device 10, or a transmission request for data in the wireless data carrier 1 from the writing / reading device 10. Sometimes sent with the data. In the latter case, since the strength of the operation radio wave 42 based on the read data and the digital measurement value data can be obtained at the same time, the operation radio wave 42 having a sufficient strength at the time of reading is received, or an emergency You can know if it was weak.

  As described above, according to the first embodiment, a special measuring instrument such as an electric field strength meter is not required in the measurement of the operating radio wave 42 received by the wireless data carrier 1, and the wireless data carrier at a position where it is actually operated. It is possible to measure the strength of the operating radio wave 42 received by the terminal 1 itself. That is, the actual radio data carrier 1 is not measured by measuring the strength or weakness of the operating radio wave 42 disturbed by the absorption or reflection of radio waves by the detector or the like of the electric field strength meter placed at the position of the radio data carrier 1. It is possible to measure the strength of the operating radio wave 42 received by the. This makes it possible to perform actual intensity measurement with much higher accuracy than measurement with a field intensity meter.

  Further, since the wireless data carrier 1 in the state where the wireless data carrier 1 is actually read or written can be grasped in real time, the strength of the operating radio wave 42 can be grasped in real time. When the operating radio wave 42 is weakened, an alarm signal can be output to the external device 15 via the external device connection unit 13.

  As will be described in detail below, since the alarm is detected on the side of the writing / reading device 11, determination under various conditions and determination conditions can be changed in real time. There are known methods for performing alarm detection on the wireless data carrier 1 side. However, in these methods, alarm detection conditions are incorporated into the wireless data carrier 1, so that the strength of the operating radio wave is simply OK or NG. However, according to the present invention, it is possible to grasp the state in which the radio wave is gradually weakened, the state in which it is strengthened, and the time average and maximum / minimum. it can.

  In addition, by preparing various determination conditions in advance, it is possible to apply the optimal determination conditions under the actual use environment.

  Next, a second embodiment according to the present invention will be described with reference to FIG.

  In the second embodiment, in addition to the first embodiment shown in FIG. 1, a voltage value corresponding to the magnitude of the digital measurement value output from the operation radio wave rectified voltage measurement value receiving unit 16 every moment is obtained. Operational radio field strength margin output unit 17 that outputs as a margin of strength, operational radio field strength margin addition unit 18 that adds the margin output from the operational radio field strength margin output unit 17, and operation An addition period designation unit 19 is provided for designating a period for which the radio wave intensity margin addition unit 18 adds.

  In actual use of the wireless data carrier 1, it is preferable to be able to determine whether the operation radio wave 42 having the lowest intensity capable of operation or the operation radio wave 42 having sufficient intensity is obtained. In particular, the reading / writing operation of the wireless data carrier 1 greatly depends on the surrounding environment where the reflection and absorption of radio waves are performed as described above. In addition, since the surrounding environment can be easily changed by moving or installing an object, the magnitude of the operating radio wave 42 received by the wireless data carrier 1 always changes. Therefore, it is necessary to always know how much strength the operating radio wave 42 has even during normal operation. Therefore, the operating radio wave intensity margin output unit 17 uses a voltage value corresponding to the magnitude of the digital measurement value output from the operating radio rectified voltage measurement value receiving unit 16 every moment to provide a margin of strength of the operating radio wave 42. It is converted and output as a degree.

  Next, the operation of the second embodiment will be described.

  Here, it is assumed that the digital measurement value output from the operation radio wave rectified voltage measurement value receiving unit 16 is 1 to 10, and that the digital measurement value increases as the reception level of the operation radio wave 42 increases. . Therefore, if the digital measurement value is large, there is a margin, and if the digital measurement value is small, there is no margin, and when the digital measurement value is 1, the lowest level is operable. This is because the digital measurement value can be obtained only after the wireless data carrier 1 can be operated. Therefore, the lowest value among the obtained digital measurement values is the lowest level at which the wireless data carrier 1 can operate. That is, the digital measurement value output from the operating radio rectified voltage measurement value receiving unit 16 is 1 at the lowest level and 10 at the highest level.

  Here, when the digital measurement value is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 as described above, the margin output by the operating radio wave intensity margin output unit 17 is −4. , -3, -2, -1, 0, 1, 2, 3, 4, 5, etc. The reason for setting the negative margin will be described later.

  Here, in general, in the wireless data carrier 1, as shown in FIG. 6, the wireless data carrier 1 on the article 41 moves within the range of the size of the writing reader antenna 11 during the moving time. Read from and write to data carrier 1. Therefore, reading and writing are performed within the time in which the article 41 moves a distance obtained by adding the length of the article 41 to the length of the writing / reading antenna 11.

  Within this time, the actual reading of the wireless data carrier 1 is usually performed several tens of times or more. Actually, reading is started from the time when the article leading edge detection sensor 45 detects that the leading edge of the article 41 has entered the end of the writing reader antenna 10, and the article trailing edge detection sensor 46 causes the article 41 to be read by the writing reader antenna 11. Reading is terminated when it is detected that the object has come out from directly below. That is, during the actual reading, the wireless data carrier 1 also moves with the movement of the article 41 and crosses the space where the reflection and absorption by the conveyor 40 etc. with respect to the operating radio wave 42 are complicated, so the wireless data carrier The intensity of the operating radio wave 42 received by the signal 1 changes from time to time, and if the operating radio wave 42 sufficient for the operation of the wireless data carrier 1 cannot be supplied, the reading by the writing reader 10 fails.

  As described above, reading is repeatedly performed from one wireless data carrier 1 many times, and reading data is obtained by successful reading several times. Therefore, in order to improve the reading rate, 1 It is effective to reduce the time required for one reading and perform as many readings as possible.

  On the other hand, in order to improve the success rate of one reading at a time, it is an indispensable condition to supply a sufficient operating radio wave 42 to the wireless data carrier 1 as described above. Accordingly, in the case where reading is repeated many times during a certain period, it is necessary to determine whether or not sufficient operation radio wave 42 is supplied and reading is possible. When the digital measurement values output from the rectified voltage measurement value receiving unit 16 are 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, the operation radio wave intensity margin output unit 17 outputs The margin is set to -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, etc., and the margin is added during the reading period. That is, when the output value of the working radio wave intensity margin output unit 17 suddenly becomes 2 or 3, there is a risk that the strong radio wave 42 may be weakened even when a strong operation radio wave 42 is received, or at a certain position. Since the operating radio wave 42 is weakened, when the margin is added and calculated by making the margin minus, the total margin is reduced in consideration of the above-mentioned danger.

  Considering a case where the added value of the margin when the reading is performed 50 times at the actual reading location is 20, for example, this is when the margin of the maximum level 5 is obtained four times or when the margin 3 is obtained. This is the case when it is obtained about 7 times, and the others are plus or minus 0. Here, even if the reception state of the operating radio wave 42 having a margin of about 3 is deteriorated, the margin is often about 0. If the margin is about 0, reading is possible. Accordingly, even if the reception state further deteriorates and half of the seven times cannot be read, 7 times-4 times = 3 times can be read. Therefore, if a margin of 20 is obtained, stable reading can be performed. I can judge. If at least two readings are successful and the two data are identical, it can be said that there is no error in the read data. However, these final determination criteria are determined by actually reading and investigating the relationship between the margin and the reading rate.

  Here, in the barcode reader described above, when a certain number of readings are performed, a method of determining whether or not reading can be performed by actual reading is performed based on the ratio of the number of readings. That is, as an example, if the label is fixed and read, and if it is scanned 50 times and read 25 times, it can be read in half. Therefore, if the label crosses the front of the barcode reader for a time that can be read six times, the label can be read three times. If two of the three data are the same, the result is output as a reading result. The method to do is common. In other words, since the reading of the bar code is hardly influenced by the surrounding environment, it is only necessary to perform a trial reading evaluation in advance, and there is usually no need to consider the margin at the actual reading place.

  As described above, in the second embodiment, it is possible to make a determination in consideration of the margin with respect to the strength or weakness of the operating radio wave 42 received by the wireless data carrier 1 during actual reading and writing performed within a certain time. It is possible to install and adjust a wireless data carrier system that secures a margin in the reception intensity of the radio wave 42. As a result, a high-performance wireless data carrier system can be constructed.

  Next, a third embodiment according to the present invention will be described with reference to FIG.

  In addition to the second embodiment shown in FIG. 2, the third embodiment includes an operating radio wave intensity margin reference value setting unit 20 and an operating radio wave margin determining unit 21, and an operating radio wave intensity margin adding unit 18. The operation radio wave intensity margin adding unit performs a comparison of the magnitude of the margin output in step 1 and the setting value output from the operation radio wave intensity margin reference value setting unit 20 by the operation radio wave margin determination unit 21. It is possible to determine whether the margin output from 18 is acceptable.

  The result of the pass / fail determination is displayed on the display 14 and output to the external device via the external device connection unit 13.

  Next, a fourth embodiment according to the present invention will be described with reference to FIG.

  In addition to the second embodiment shown in FIG. 2, the fourth embodiment enables stable determination of the strength of the response radio wave 43 transmitted from the wireless data carrier 1 received by the writing / reader antenna 11. Therefore, the response radio wave 43 sent from the transmitting unit 7 of the wireless data carrier 1 to the writing reader 10 in response to a transmission request of various data from the writing reader 10 to the wireless data carrier 1 is written to the writing reader 10. A response radio wave detection / rectification unit 30 that detects and rectifies an AC voltage generated by the response radio wave 43 generated by the write / reader antenna 11, and a response radio wave detection / rectification unit 30. A response radio wave rectification voltage measurement unit 31 that measures the output voltage value, a response radio wave intensity margin output unit 32 that inputs a measurement value output from the response radio wave rectification voltage measurement unit 31 and outputs a margin, and a response power And a response radio wave strength margin adder unit 33 for a period of time adding a margin to be outputted from the intensity margin output section 21 addition period specifying section 19 specifies.

  As described above, the reading operation of the data written in the data portion 8 of the wireless data carrier 1 is such that the wireless data carrier 1 receives the operating radio wave 42 and generates power for operating the wireless data carrier 1 itself. The response radio wave 43 modulated by the contents and control information of the data portion 8 written in the wireless data carrier 1 by this power is sent back to the writing reader 10 via the writing reader antenna 11. Is called.

  Therefore, in actual reading, it is preferable that the operation radio wave 42 received by the wireless data carrier 1 is strong and the response radio wave 43 received by the writing reader antenna 11 is strong. For this reason, the response radio wave 43 received by the write reader antenna 11 by changing the arrangement of surrounding installations that reflect or absorb radio waves, or by changing the distance between the write reader antenna 11 and the wireless data carrier 1. It is desirable to increase the strength.

  Here, in the fourth embodiment, a response radio wave 43 sent from the transmitter 7 of the wireless data carrier 1 to the writing reader 10 in response to various data transmission requests from the writing reader 10 to the wireless data carrier 1. In addition to the response radio wave detection rectification unit 30 that receives and rectifies the AC voltage generated by the response radio wave 43 generated in the write reader antenna 11 by the write reader antenna 11 connected to the write reader 10. Yes. Therefore, when the response radio wave 43 received by the write / reader antenna 11 is strong, the high AC voltage is generated in the write / reader antenna 11, and when the response radio wave 43 is weak, the low AC voltage is generated and responds. It is added to the radio wave detection / rectification unit 30. The AC voltage applied to the response radio wave detection rectification unit 30 is output from the response radio wave detection rectification unit 30 to the response radio wave rectification voltage measurement unit 31 as a detected and rectified DC voltage. Subsequently, the response radio wave intensity margin output unit 32 inputs the measurement value output from the response radio wave rectification voltage measurement unit 31 and outputs the margin as in the operation of the operation radio wave intensity margin output unit 17. The response radio wave intensity margin adding unit 33 adds the margin output from the response radio wave intensity margin output unit 32 within the period specified by the addition period specifying unit 19.

  Therefore, since the margin is averaged by adding within the period specified by the addition period specifying unit 19, the margin is reliable even in an environment where the received electric field strength does not change in Japanese Patent Laid-Open No. 5-167471. Judgment is possible.

  Here, it is preferable that the margin output by the response radio wave intensity margin output unit 32 includes a minus as in the first embodiment. That is, when a response radio wave 43 with a small margin is received, there is a risk that the radio wave 43 may be weakened rapidly even when a strong response radio wave 43 is received, or the operation radio wave 42 is weakened at a specific position. This is because when the margin is added and calculated by making the margin minus, the total margin is reduced in consideration of the risk.

  As described above, in the fourth embodiment, both the strength information of the operating radio wave 42 received by the wireless data carrier 1 in the actual reading and writing operation state and the strength information of both the response radio wave 43 received by the writing reader antenna 11 are obtained. It becomes possible to receive.

  Accordingly, it is possible to change the arrangement of surrounding installations that reflect or absorb radio waves while receiving both strength information and to change the interval between the writing reader antenna 11 and the wireless data carrier 1. Therefore, it is possible to simultaneously increase the strength of both the operation radio wave 42 and the response radio wave 43. Therefore, it is possible to construct a wireless data carrier system with higher performance than the first embodiment.

  Next, a fifth embodiment according to the present invention will be described with reference to FIG.

  In addition to the fourth embodiment shown in FIG. 4, the fifth embodiment includes a response radio wave intensity margin reference value setting unit 34, a response radio wave margin determination unit 35, and an overall determination unit 36.

  The response radio wave margin determination unit 35 performs a comparison comparison between the margin added by the response radio wave intensity margin addition unit 33 and the set value output from the response radio wave intensity margin reference value setting unit 34. It is possible to determine whether the margin output from the strength margin adding unit 33 is acceptable.

  The determination result output from both the operating radio wave intensity margin determination unit 21 and the response radio wave margin determination unit 35 is output to the write / read control unit 12, and the write / read control unit 12 displays the determination result. 14 and output to an external device via the external device connection unit 13. The other operations are the same as those in the second and third embodiments.

  In the description of each of the above embodiments, the margin output by the operating radio wave intensity margin output unit 17 is set to -4, -3, -2, -1, 0, 1, 2, 3, 4, 5. However, in an environment where strong reflection or absorption occurs and disturbances such as external radio waves are considered, it is necessary to strictly determine the margin, so the minus side is −8, −6, −4, −2. It is also possible to do. Conversely, when the surrounding environment is good and reflection or absorption hardly occurs, it can be dealt with by reducing the minus side.

  Further, the operation radio wave intensity margin output unit 17 and the response radio wave intensity margin output unit 32 output the same values as the values output by the operation radio wave rectified voltage measurement value reception unit 16 and the response radio wave rectification voltage measurement unit 31. Is also possible. Further, since the intensity of the operation radio wave 42 actually received by the operation radio wave rectified voltage measurement value receiving unit 16 is obtained every moment, the output value from the operation radio wave rectified voltage measurement value receiving unit 16 for the movement of the article 41 is displayed. By displaying on the device 14, it is possible to know the strength of the operating radio wave 42 relative to the position of the wireless data carrier 1. Similarly, in the response radio wave 43, it is possible to know the strength of the response radio wave 43 from moment to moment with respect to the position of the wireless data carrier 1. Therefore, it is possible to determine the strength of the operating radio wave by grasping the state in which the radio wave is gradually weakened, the state in which the radio wave is getting stronger, and the time average and maximum / minimum.

  Since the voltage generated in the writing reader antenna 11 by the response radio wave 43 applied to the response radio wave detection / rectification unit 30 shown in the fourth and fifth embodiments is very weak, the response radio wave detection / rectification unit via the amplifier 30 may be added. It is also possible to synchronize the measurement timing of the response radio wave rectified voltage measuring unit 31 with a start signal included in the operation radio wave 42. This is because, as described above, the strength of the operating radio wave 42 to be actually measured and determined is the strength in a state where a signal is transmitted.

1 is a block diagram showing a wireless data carrier writing / reading system according to a first embodiment of the present invention. FIG. FIG. 2 is a block diagram showing a wireless data carrier writing / reading system according to a second embodiment of the present invention. FIG. 5 is a block diagram showing a wireless data carrier writing / reading system according to a third embodiment of the present invention. FIG. 6 is a block diagram showing a wireless data carrier writing / reading system according to a fourth embodiment of the present invention. FIG. 10 is a block diagram showing a wireless data carrier writing / reading system according to a fifth embodiment of the present invention. It is a figure which shows one example of the state which reads the radio | wireless data carrier conveyed with a belt conveyor. It is a figure which shows reflection of the electromagnetic wave in a reflecting plate for demonstrating the basic operation | movement of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wireless data carrier 2 Wireless data carrier antenna 3 Operation | movement radio wave rectification voltage measurement part 4 Operation | movement radio wave detection rectification part 5 Reception part 6 Data writing control part 7 Transmission part 8 Data part 10 Write reader 11 Write reading Antenna 12 Write / read control unit 13 External device connection unit 14 Display unit 15 External device 16 Operation radio wave rectified voltage measurement value reception unit 17 Operation radio wave intensity margin output unit 18 Operation radio wave intensity margin addition unit 19 Addition period Specification unit 20 Operation radio wave intensity margin reference value setting unit 21 Operation radio wave margin determination unit 30 Response radio wave detection rectification unit 31 Response radio wave rectification voltage measurement unit 32 Response radio wave intensity margin output unit 33 Response radio wave intensity margin addition unit 34 Response radio wave intensity margin reference value setting unit 35 Response radio wave margin determination unit 36 General determination unit 37 Conveyor belt 40 Conveyor 41 Article 42 Operation radio wave 3 response electric wave 44 reflected wave 45 article front end detecting sensor 46 articles rear sensor 47 standing wave 48 antinode positions 49 Section position 50 reflector

Claims (10)

An operation radio wave detection / rectification unit that detects and rectifies operation radio waves received from an external system such as a writing reader as operation power, and an operation radio voltage that measures the voltage value of the operation power and outputs a measurement value A wireless data carrier comprising: a measurement unit; and a transmission unit that transmits the measurement value to the external system. A wireless data carrier antenna for receiving operating radio waves and various data from an external system such as a writing reader; a receiving unit for receiving various data from the external system via the wireless data carrier antenna; and the reception A data section in which various data received by the section is written, a data writing / reading control section for controlling writing / reading of various data to / from the data section, and operating radio waves received by the wireless data carrier antenna Operation radio wave detection and rectification unit for detecting and rectifying as operation power, operation radio voltage measurement unit for measuring the voltage value of the operation power and outputting the measurement value, and various values written in the measurement value and the data unit A wireless data carrier comprising: a transmission unit for transmitting data to the external system. In the writing reader that transmits the operating radio wave and various data to the wireless data carrier, and receives the measured value and various data as the response radio wave, measuring the voltage value of the operating power from the wireless data carrier,
A writing / reading device comprising: an operation radio wave rectified voltage measurement value receiving unit that receives the measurement value from the response radio wave; and an output unit that outputs the received measurement value in a predetermined format. The writing / reading device according to claim 3, wherein the output unit is display means for displaying the measurement value in a predetermined format. In the writing reader that transmits the operating radio wave and various data to the wireless data carrier, and receives the measured value and various data as the response radio wave, measuring the voltage value of the operating power from the wireless data carrier,
A write / read control unit for controlling the voltage measurement system of the write / read device, an external device connection unit for inputting / outputting various data to / from the external device, and an operation for receiving the measurement value from the response radio wave A writing reader comprising: a radio rectified voltage measurement value receiving unit for use; and a display unit for displaying the received measurement value in a predetermined format. An operating radio wave intensity margin output unit that outputs as a margin of operating radio wave intensity corresponding to the magnitude of the received measurement value, an operating radio wave intensity margin adding unit that adds the margin, 6. The writing / reading device according to claim 3, further comprising: an addition period specifying unit that specifies a period to be added by the operation radio wave intensity margin adding unit. An operational radio wave intensity margin reference value setting unit for setting the reference value of the added margin, and an operational radio wave margin determination unit for comparing and comparing the added margin and the reference value The writing reader according to claim 6. A response radio wave detection and rectification unit that detects and rectifies an AC voltage generated by the response radio wave, a response radio wave rectification voltage measurement unit that measures a voltage value output from the response radio wave detection and rectification unit, and a response radio wave rectification voltage measurement unit that outputs A response radio field intensity margin output unit that outputs a measured value and outputs a margin, and a response that adds the margin output from the response radio field intensity night margin output unit for a period specified by the addition period designation unit The writing / reading device according to claim 6, further comprising: a radio field intensity margin adding unit. A response radio wave intensity margin reference value setting unit that sets a reference value of the margin added by the response radio wave intensity addition unit, a margin added by the response radio wave intensity addition unit, and the response radio wave intensity margin reference value The writing / reading device according to claim 8, further comprising: a comprehensive determination unit that compares and determines the reference value set by the setting unit. A wireless data carrier writing / reading system comprising the wireless data carrier according to any one of claims 1 and 2 and the writing reader according to any one of claims 3 to 9.

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