JP2007188279A - Tag information reading/writing system for wireless ic tag for specifying tag information and position information of object - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tag information reading/writing system for a wireless IC tag for specifying the tag information and position information of an object allowed to be judged by relatively recording individual information (tag information) concerned with the object such as a person and an article having the wireless IC tag and the position information of the object. <P>SOLUTION: The tag information reading/writing system 1 for a wireless IC tag comprises: a sensor/antenna unit 2 in which an antenna 3 to be used for data communication with the wireless IC tag and an object detection sensor for detecting the existence of the object are integrally formed; and a tag information reading/writing means 5 for reading or writing tag information from/in the wireless IC tag through the antenna 3. The tag information reading/writing means 5 starts reading or writing operation of the tag information under a condition that the object is detected by the object detection sensor 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to tag information and position information of an object having an antenna used for data communication with a wireless IC tag, and tag information read / write means for reading or writing tag information to or from the wireless IC tag via the antenna. The present invention relates to a wireless IC tag tag information read / write system for specifying.

  Today, individual information on people and things is recorded in a wireless IC tag as tag information, and these tag information (individual information) is read from the wireless IC tag in a non-contact manner as necessary, thereby quickly A system has been developed to make authentication decisions. Specifically, the individual information (tag information) of the wireless IC tag is obtained by consciously holding the wireless IC tag over the antenna of the RF-ID reader or RF-ID writer that is searching for the wireless IC tag. It is configured to be read / written by an RF-ID reader / writer.

  An RF-ID reader / writer is generally capable of data communication with a wireless IC tag only at a short distance of about 10 cm from the antenna. Data communication is performed when the user consciously holds the wireless IC tag over the antenna. It is possible to do.

  On the other hand, in order to increase the data communication distance, products capable of data communication from an antenna to a middle distance of about 20 m have been developed by increasing the radio wave of the wireless IC tag. Furthermore, an attempt has been made to widen the data communication range with the wireless IC tag by installing a plurality of antennas for the RF-ID reader / writer.

  However, in the case where the RF-ID reader / writer has a plurality of antennas, the wireless IC tag in which data is read / written by one antenna is recognized again by another antenna, and duplicate data is read / written. There was a problem that it might be done. In order to prevent such repeated reading and writing, the wireless IC tag is provided with a deep sleep state in which no response is made to the RF-ID reader / writer, and the RF-ID reader / writer is connected to other wireless IC tags. There has been devised a method for preventing the communication from being obstructed by the RF-ID reader / writer while preventing communication from being interrupted (for example, see Patent Document 1).

  In addition, when a plurality of RF-ID readers / writers are provided, radio wave interference or the like occurs when RF-ID readers / writers close to the antenna operate simultaneously, so that tag information of the wireless IC tag can be read and written correctly. There was a risk of not being able to. In order to avoid such radio wave interference, for example, a method of alternately switching the operation of adjacent antennas has been devised so that radio waves are not simultaneously output from adjacent antennas (see, for example, Patent Document 2).

  On the other hand, attempts have been made to acquire information (position information) on the spatial position of an object (person or object) by using a wireless IC tag and an RF-ID reader / writer.

For example, based on the direction of arrival of radio waves used for data communication between a wireless IC tag and an RF-ID reader / writer, a method for acquiring position information of a person or an object (for example, see Patent Document 3), A method for obtaining a current position by installing a large number of wireless IC tags on a building, a sidewalk, etc., recording position information such as latitude and longitude on the wireless IC tag, and reading the position information of the wireless IC tag with an RF-ID reader Has been devised (see, for example, Patent Document 4).
Japanese Patent Laying-Open No. 2005-102215 (page 4-5) Japanese Patent Laying-Open No. 2005-157645 (page 3-4, FIG. 2) Japanese Patent Laying-Open No. 2005-291916 (page 3-4) Japanese Patent Laying-Open No. 2005-189225 (page 8-10)

  However, when position information is obtained using a wireless IC tag and an RF-ID reader / writer, sufficient position accuracy is ensured even if a method for obtaining position information of an object based on the direction of arrival of radio waves is used. However, it is difficult to obtain position information using only an RF-ID reader / writer.

  In addition, a large number of wireless IC tags are installed on buildings, sidewalks, etc., position information such as latitude and longitude is recorded on the wireless IC tag, and the current position is obtained by reading the position information of the wireless IC tag with an RF-ID reader. In the method, it is necessary to install an RF-ID reader / writer for reading position information of a wireless IC tag installed on a sidewalk or the like on the object (person or object) side having the wireless IC tag. Therefore, when it is desired to record tag information (individual information) related to an object (person or object) and position information of the object in association with each other, position information read by an RF-ID reader / writer provided on the object. Therefore, there is a problem that the system configuration becomes complicated.

  Moreover, the method of switching the operation of adjacent antennas has a problem that the processing load increases because it is necessary to actively perform switching control of the antennas at regular intervals.

  Further, even when switching the operation of the antenna, it is not possible to know when the wireless IC tag enters the readable range of the antenna. Therefore, it is necessary to always operate the RF-ID reader / writer in a short time period. It was. However, it is not preferable to always operate the RF-ID reader / writer from the viewpoint of the use efficiency of radio wave resources and the suppression of energy consumption, and the always-operating RF-ID reader / writer is not suitable for other devices. There is a problem that it may become a noise generation source.

  Even when switching the operation of the antenna, if one RF-ID reader / writer performs read / write operations of a plurality of wireless IC tags via the antenna, it causes radio wave interference and correctly transmits data. There was a problem that reading and writing might not be possible.

  Furthermore, when the data communication distance is extended by strengthening the radio wave of the wireless IC tag, or when the data communication distance is extended by installing multiple antennas, multiple wireless IC tags can communicate with the same antenna. It was necessary to provide an anti-collision function in order to prevent the occurrence of radio wave interference when entering the range.

  In addition, the method of providing a deep sleep state for a wireless IC tag is not necessarily the best method because the structure and control of the wireless IC tag are complicated and the cost of the wireless IC tag is increased. There was no problem.

  The present invention has been made in view of the above-described problem, and records individual information (tag information) related to an object such as a person or an object having a wireless IC tag and position information of the object in association with each other and makes a determination. It is an object of the present invention to provide a tag information read / write system for a wireless IC tag for specifying tag information and position information of an object that can be performed.

  In order to solve the above problems, a tag information read / write system for a wireless IC tag for identifying tag information and position information of an object according to the present invention includes an antenna and an object used for data communication with the wireless IC tag. A sensor / antenna unit integrally formed with an objective detection sensor for detecting the presence of the tag, and tag information read / write means for reading or writing tag information via the antenna with respect to the wireless IC tag, The tag information read / write means starts reading or writing the tag information on condition that the object is detected by the objective detection sensor.

  Further, the tag information read / write system for wireless IC tag for identifying the tag information and the position information of the object is provided with a plurality of the sensor / antenna units, and the object detection sensor detects the object Furthermore, an antenna switching means for switching the antenna connected to the tag information reading / writing means to the antenna of the objective detection sensor in which the object is detected may be provided.

  Furthermore, the tag information read / write system for a wireless IC tag for identifying tag information and position information of an object has identification information for each objective detection sensor to identify the sensor / antenna unit, and When the object detection sensor detects the object, the identification number is acquired from the object detection sensor, and the position information of the object is obtained based on the arrangement position information of the sensor / antenna unit corresponding to the identification number. An information recording means for acquiring and recording the tag information related to the object and the position information by acquiring the tag information read by the tag information read / write means for which the antenna has been switched; It may be.

  Further, the tag information read / write system for wireless IC tag for identifying the tag information and the position information of the target object creates history information by recording the position information and the tag information over time. Means may be provided.

  According to the wireless IC tag tag information read / write system for identifying tag information and position information of an object according to the present invention, an antenna used for data communication with the wireless IC tag and an object for detecting the presence of the object. Since the detection sensor is integrally formed with the sensor / antenna unit, the object including the wireless IC tag can be reliably detected by the objective detection sensor. In addition, since data communication with the wireless IC tag is performed via the antenna formed integrally with the object detection sensor, it is possible to reliably read / write the tag information of the wireless IC tag that the object has.

  In addition, by forming the antenna and the objective detection sensor integrally, it is possible to reduce the installation burden compared to the case where the antenna and the objective detection sensor are separately installed.

  Furthermore, since the tag information read / write means starts the tag information read / write operation on the condition that the object is detected by the object detection sensor, it is not necessary to always operate the tag information read / write means, and the use efficiency of radio wave resources is improved. And energy consumption can be reduced.

  Further, when the object is detected by the objective detection sensor, the tag information read / write means starts to operate, so even if other tag information read / write means are provided close to each other, each other's tag information read / write The possibility that the means will operate simultaneously is reduced, and radio wave interference and the like are less likely to occur.

  Furthermore, according to the tag information read / write system for a wireless IC tag for specifying tag information and position information of an object according to the present invention, a plurality of sensors / antenna units are arranged, so that the wireless IC tag is recognized. In addition, the antenna switching unit can switch the antenna of the tag information read / write unit to the antenna of the sensor / antenna unit from which the object has been detected. It is possible to prevent a reliable radio wave from being output.

  In addition, since the antenna of the tag information read / write means is switched to the antenna of the sensor / antenna unit in which the object is detected by the antenna switching means, even when a plurality of antennas are installed, it is closest to the object Data communication with the wireless IC tag can be performed using the antenna.

  Furthermore, the tag information read / write system for the wireless IC tag for identifying the tag information and the position information of the object according to the present invention determines the position information of the object based on the identification number acquired from the objective detection sensor. It becomes possible to grasp the position of the object with high positional accuracy. Furthermore, since the tag information read / write means acquires tag information via an antenna installed integrally with the objective detection sensor that detects the object, it is possible to reliably acquire tag information of the object from which the position information has been acquired. It is possible to record and judge tag information and position information of the same object in association with each other.

  In the tag information reading / writing system for a wireless IC tag for identifying tag information and position information of an object according to the present invention, history information creating means records the position information and the tag information over time. Thus, since the history information is created, it is possible to estimate the movement state of the target object (change in position information over time) and the like based on the history information.

  Hereinafter, a tag information read / write system for a wireless IC tag for specifying tag information and position information of an object according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view showing a sensor / antenna unit 2 used in a tag information reading / writing system for a wireless IC tag. The sensor / antenna unit 2 includes an antenna 3 and an objective detection sensor 4. The antenna 3 is used when the RF-ID reader / writer performs data communication with a wireless IC tag provided on an object such as a person or an object.

  The wireless IC tag records individual information regarding the object as tag information. For example, if the object is a person, information for identifying the person such as name, date of birth, department name, or information specific to the person is recorded. If the object is an object, the name of the object In addition, information for specifying a product such as a model number and a manufacturing date, information unique to the product, and the like are recorded.

  On the other hand, the objective detection sensor 4 is a sensor for detecting the presence of an object, and in this embodiment, a pressure sensor that determines the presence or absence of an object based on the pressure applied to the sensor is used. . The objective detection sensor is not necessarily limited to a pressure sensor, and may detect the presence of an object based on an image photographed by an imaging means such as a CCD. The object detection sensor 4 includes an optical sensor (cds cell, infrared sensor, phototransistor, CCD, etc.), a mechanical sensor (mechanical push switch, displacement sensor, pressure sensor, impact sensor, etc.), a sound sensor (microphone, ultrasonic wave, etc.). Any sensor that can detect the presence or movement of an object such as a person or object, such as a microphone, a vibration sensor, or a radio wave sensor (such as a Doppler sensor). However, the type of sensor is not limited.

  As shown in FIG. 1, the antenna 3 and the objective detection sensor 4 are integrally formed on a base 20 having a circular recess 20a formed in the center, and are along the inner peripheral side of the recess 20a. Then, the antenna 3 is installed in a loop shape, and the objective detection sensor 4 is provided in the center portion with the detection surface 4a facing the upper surface. The objective detection sensor 4 is preferably installed so that the detection surface (upper surface) 4a of the objective detection sensor 4 slightly protrudes from the upper surface 20b of the base 20 so that the pressure can be easily detected.

  The sensor / antenna unit 2 may be formed by a tile-shaped base 21a as shown in FIG. 2 (a) in order to improve the installation property, and as shown in FIG. You may form in the sheet form using the high base 21b.

  FIG. 3 is a diagram showing a schematic configuration of the tag information read / write system 1 for the wireless IC tag. The tag information read / write system 1 for a wireless IC tag includes a plurality of sensors / antenna units 2, three RF-ID reader / writers 5, a matrix antenna switching machine 6, and a processing device 7. In this embodiment, a case where three RF-ID reader / writers 5 are installed will be described as an example. However, the number of RF-ID reader / writers is not necessarily limited to three, but one or two. Or four or more may be sufficient. Further, the number of sensors / antenna units 2 to be installed is not particularly limited, and any number can be used as long as a plurality of sensors / antenna units 2 can be connected to one RF-ID reader / writer. There may be.

  The matrix antenna switching device 6 is a device for switching the antenna 3 connection of the sensor / antenna unit 2 connected to one RF-ID reader / writer. By the antenna switching operation of the matrix antenna switching device 6, signal lines are connected so that only one sensor / antenna unit 2 is connected to one RF-ID reader / writer. The matrix antenna switching device 6 performs an antenna switching operation in accordance with an instruction from the processing device 7 input via the antenna switching line 11.

  Identification information for identifying each sensor / antenna unit is recorded in each objective detection sensor 4 of the sensor / antenna unit 2. Each object detection sensor 4 is connected to the processing device 7 via the sensor signal line 12 and is detected when the object detection sensor 4 senses pressure and detects an object (person or object). Identification information of the sensor / antenna unit 2 (this identification information also serves as a detection signal of the object) is output to the processing device 7. The processing device 7 specifies the sensor / antenna unit 2 on which the object is detected by receiving the identification number.

  The sensor / antenna unit 2 and the processing device 7 can be connected to each objective even if a serial transfer type connection method in which the sensor signal line 12 is connected in series to send a detection signal is used. A parallel transfer type connection method in which detection sensors 4 are connected in parallel to the processing device 7 from the detection sensor 4 to transmit detection signals may be used. When the parallel transfer type connection method is used, the sensor / antenna unit 2 can be specified by the processing device 7 determining the sensor signal line to which the detection signal is input.

  The processing device 7 is provided with a recording unit 8. The recording unit 8 records an arrangement position conversion table for obtaining arrangement position information of the sensor / antenna unit 2 based on the identification information. In addition, the recording unit 8 is read / written by the identification information obtained from the object detection sensor 4, the arrangement position information obtained based on the arrangement position conversion table, and the RF-ID reader / writer 5. Tag information and the like are recorded.

  When obtaining the identification information from the objective detection sensor 4, the processing device 7 uses the arrangement position conversion table recorded in the recording unit 8 to obtain the arrangement position of the sensor / antenna unit 2. Then, the processing device 7 controls the matrix antenna switching machine 6 so that the obtained antenna of the sensor / antenna unit 2 and the RF-ID reader / writer 5 are connected, and the RF-ID reader / writer 5 The individual information (tag information) of the wireless IC tag can be acquired via the antenna 3 of the sensor / antenna unit 2 from which the object is detected.

  The individual information read / written by the RF-ID reader / writer 5 is sent to the processing device 7. The processing device 7 determines an object based on the received individual information and associates the obtained object information with the arrangement position information (that is, the position information of the object) with the detection time ( History information regarding the object is created.

  The processing device 7 uses the created history information for specifying an object and determining individual information of the object.

  For example, the processing device 7 determines that the content of the individual information acquired by the objective detection sensor 4 is the same as the content of the individual information acquired via the same antenna a while ago by using the history information. In this case, it is determined that the object does not move and stays at the same position, and communication with the wireless IC tag is performed even though the operation interval of the RF-ID reader / writer is secured for a certain time.

  Further, the processing device 7 determines that the object is detected by the objective detection sensor 4, and executes the individual information reading process using the RF-ID reader / writer 5 after the antenna switching process by the matrix antenna switching machine 6. Nevertheless, if the individual information cannot be acquired from the wireless IC tag, it can be considered that interference of the radio wave output from the antenna 3, high-speed movement of the wireless IC tag, or the like has occurred. . In such a case, when the processing device 7 can determine that the moving speed of the object tends to be slower than the history information by using the history information, for example, the processing device 7 uses the same antenna 3 again. When reading processing is performed and the moving speed of the object tends to be faster than the history information, the antenna 3 and the RF-ID reader / writer that are likely to enter the next radio wave obtainable range based on the moving pattern of the object 5 is connected using the matrix antenna switching device 6 to perform the individual information reading process. Thus, by switching the antenna that performs data communication of the wireless ID tag based on the history information, it is possible to increase the possibility that the tag information of the wireless IC tag that the object has can be acquired again.

  Furthermore, if individual information cannot be read from the wireless IC tag even when antenna switching processing or the like based on history information is performed, previous information of the object recorded as history information, for example, behavior By reusing history data, time information, position information, individual information, etc., it becomes possible to supplement necessary information regarding the object.

  Further, by comparing the movement pattern of the object recorded in the history information with the movement pattern of the object currently detected by the object detection sensor 4, an object having a similar movement pattern is obtained, and the object detection sensor 4 makes it possible to obtain individual information of the object currently detected from past history information.

  Furthermore, after the object is detected by the object detection sensor 4, the object detection sensor 4 does not detect the object for a while, and after a while, the object is detected in a remote place, It is also possible to infer a behavior pattern in the middle from the behavior history data of the target object, and to generate and save information between them based on past history information.

  A server computer 10 is connected to the processing device 7 directly using a cable or indirectly via a network or the like. The processing device 7 causes the server computer 10 to store and manage all data by sending history information and the like recorded in the recording unit 8 to the server computer 10 at regular time intervals or in accordance with a decrease in recordable capacity. . The processing device 7 also records part of the history information as action history data on the wireless IC tag by the RF-ID reader / writer 5.

  In the wireless IC tag tag information read / write system 1 constructed as described above, the antenna 3 used for data communication with the wireless IC tag and the objective detection sensor 4 for detecting the presence of the object are a sensor / antenna unit. 2, the object having the wireless IC tag can be reliably detected by the objective detection sensor 4.

  Further, since data communication with the wireless IC tag is performed via the antenna 3 formed integrally with the objective detection sensor 4, it is possible to reliably read / write the tag information of the wireless IC tag that the object has.

  Furthermore, by forming the antenna 3 and the objective detection sensor 4 integrally, it is possible to reduce the installation burden compared to the case where the antenna 3 and the objective detection sensor 4 are separately installed.

  Further, since the RF-ID reader / writer 5 starts the tag information read / write operation on the condition that the object is detected by the object detection sensor 4, it is not necessary to always operate the RF-ID reader / writer 5. It becomes possible to improve the utilization efficiency of radio wave resources and to suppress the energy consumption.

  Furthermore, when the object is detected by the objective detection sensor 4, the RF-ID reader / writer 5 starts to operate, and therefore, another RF-ID reader / writer is provided in the vicinity. However, the possibility that the RF-ID reader / writers operate at the same time is reduced, and radio wave interference and the like are less likely to occur.

  Further, in the wireless IC tag tag information read / write system 1, since a plurality of sensors / antenna units 2 are arranged, the radio wave receivable range in which the wireless IC tag can be recognized can be widened, and the matrix antenna switching can be performed. Since the antenna of the RF-ID reader / writer 5 is connected to the antenna of the sensor / antenna unit 2 from which the object has been detected by the machine 6, the radio waves for data communication are output only from the switched antenna 3 It is possible to prevent unnecessary radio waves from being output from other antennas.

  Further, since the antenna 3 of the RF-ID reader / writer 5 is switched to the antenna of the sensor / antenna unit 2 where the object is detected by the matrix antenna switching device 6, a plurality of antennas are installed (arranged). Even in this case, data communication with the wireless IC tag can be performed using the antenna 3 closest to the object.

  Further, since the antenna switching control is performed by the matrix antenna switching device 6, a plurality of RF-ID reader / writers 5 are provided, and even when each RF-ID reader / writer 5 operates simultaneously, each RF-ID reader / writer 5 operates. Since antenna switching suitable for the ID reader / writer 5 can be performed for each RF-ID reader / writer 5, it is possible to read / write data from / to a plurality of wireless IC tags, and delay in data read / write processing hardly occurs. Become. Furthermore, the number of RF-ID reader / writers 5 can be easily optimized according to the number of wireless IC tags that are read and written at a time.

  Furthermore, since the tag information read / write system 1 for the wireless IC tag determines the position information of the object based on the identification number acquired from the objective detection sensor 4, it is possible to grasp the position of the object with high position accuracy. Become. Furthermore, since the RF-ID reader / writer 5 acquires tag information via the antenna 3 that is installed integrally with the objective detection sensor 4 that has detected the object, the tag information of the object from which the position information has been acquired is surely obtained. The tag information and the position information of the same object can be recorded and judged in association with each other.

  For example, an RF-ID reader / writer antenna is installed at the entrance of the room and in the center of the room, and tag information of the object is acquired via the antenna, and a human sensor is installed in the room to use the sensor. When there is a system that acquires position information of an object and manages the tag information of the object and the position information of the object in association with each other, in this system, two objects carrying wireless IC tags are brought into close contact with each other If released later, it will be difficult to determine which wireless IC tag information belongs to which object. On the other hand, in the tag information read / write system 1 for a wireless IC tag according to the present invention, an antenna and a sensor are integrated, and a plurality of antennas and sensors are installed. Therefore, detection of an object by the sensor and wireless IC of the object are performed. It becomes possible to always associate and grasp the tag.

  Further, in the wireless IC tag tag information read / write system 1, the processing device 7 creates history information by recording position information and tag information over time. It is possible to estimate the change in position information with time).

  Next, a specific embodiment using the tag information read / write system 1 for a wireless IC tag according to the present invention will be described.

  For example, the wireless IC tag tag information read / write system 1 according to the present invention is used for hospital information guidance by placing the sensor / antenna unit 2 on the floor and attaching a wireless IC tag to shoes or slippers. Can do. When a medical patient moves to a medical room, examination room, or the like, the processing device 7 reads the wireless IC tag of the medical patient, and based on the current position information of the medical patient and individual information on the medical room to be next, It is possible to specify where the patient is heading and, if necessary, to display guidance for guiding the patient to the clinic to which the patient should go on a display board near the patient. Is possible. In this way, it is possible to make judgments by associating patient behavior with information about the patient, so it can be used for automating the examination schedule, for checking inpatients at night, and for checking suspicious persons. Can be.

  Similarly, by placing the sensor / antenna unit 2 on the floor and obliging to wear shoes or slippers with wireless IC tags, it is difficult to photograph a face with a surveillance camera or the like, and it is difficult to identify an individual. It is also possible to easily identify an individual. In particular, by using this system in a site where confidentiality is required, it becomes easy to improve confidentiality.

  In addition, by wearing shoes or slippers with different wireless IC tags attached to the right foot and left foot, it becomes easy to determine which one the target person is facing.

  In addition, since it is possible to determine whether the object is walking or running based on the moving speed, when a person running on the site that does not need to run is detected, the person who has experienced an emergency operation It becomes possible to judge (recognize).

  In addition, if tag information cannot be acquired from the wireless IC tag even though the object is detected by the sensor, it can be determined that an object not carrying the wireless IC tag has entered. It is also possible to detect external intruders at an early stage and promptly issue an alarm.

  When the tag information read / write system 1 for wireless IC tags according to the present invention is used in a high-rise building construction site, an area handling radiation, such as a nuclear power plant, or a dangerous site such as a mine, the sensor / antenna unit 2 is installed on the ceiling By installing and attaching a wireless IC tag to the helmet, tag information of the wireless IC tag can be acquired with high sensitivity, and the behavior of the worker can be easily grasped.

  Furthermore, when the object has not moved for a long time where it should move, or suddenly moves away from the recognizable range of the sensor / antenna unit 2, it can be assumed that an accident has occurred, and history information Since it becomes easy to understand who has experienced what kind of accident through what condition, it can be used for lifesaving and accident prevention.

  The wireless IC tag tag information read / write system 1 for specifying the tag information and position information of the object according to the present invention has been described above with reference to the drawings. The read / write system is not limited to the one described above. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Is done.

  For example, in the sensor / antenna unit, as shown in FIG. 4A, the ground wire 18 may be disposed around the antenna, or the surface of the base may be constituted by the ground surface 19. With this configuration, it is possible to reduce radio wave interference and noise between adjacent antennas. Also, the sensor installation position does not necessarily have to be arranged at the center of the antenna as shown in the embodiment, and is not limited to the center of the loop antenna 3 of the objective detection sensor 4 as shown in FIG. Alternatively, it may be installed outside the circumference of the loop antenna 3.

  Further, as a signal line used in the tag information read / write system for the wireless IC tag, as shown in FIG. 5A, a coaxial cable or a cable 14 whose signal shaft portion is covered with a shielded wire may be used, or FIG. As shown in FIG. 5, the influence of noise on the signal line can be reduced by using a cable 17 in which a ground wire 16 having a planar shape is sandwiched above and below the flat signal shaft portion 15. .

It is the perspective view which showed the sensor and antenna unit. (A) is the perspective view which showed the sensor and antenna unit formed in tile shape, (b) is the perspective view which showed the sensor and antenna unit formed in sheet form. It is the block diagram which showed schematic structure of the tag information read / write system for radio | wireless IC tags which concerns on this embodiment. (A) is a perspective view which shows the structure which installed the earth wire etc. with respect to the sensor and antenna unit shown in FIG. 1, (b) is the installation position of the objective detection sensor in the sensor and antenna unit shown in FIG. It is a perspective view which shows the changed sensor and antenna unit. It is the perspective view which showed the structural example of the signal wire | line used for the tag information read / write system for radio | wireless IC tags.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Tag information read / write system for wireless IC tags 2 ... Sensor / antenna unit 3 ... Antenna 4 ... Objective detection sensor 4a ... Detection surface 5 ... RF-ID reader / writer 6 ... Matrix antenna switch 7 ... Processing device 8 ... Recording unit DESCRIPTION OF SYMBOLS 10 ... Server computer 11 ... Antenna switching line 12 ... Sensor signal line 14, 17 ... Cable 15 ... Signal shaft part 16, 18 ... Ground wire 19 ... Ground surface 20, 21a, 21b ... Base 20a ... Circular recess 20b ... Top surface (of the base)

Claims (4)

A sensor / antenna unit in which an antenna used for data communication with a wireless IC tag and an object detection sensor for detecting the presence of an object are integrally formed;
Tag information reading / writing means for reading or writing tag information via the antenna with respect to the wireless IC tag,
The tag information read / write means starts to read or write the tag information on condition that the object is detected by the objective detection sensor, and identifies tag information and position information of the object Tag information read / write system for wireless IC tag. While arranging a plurality of the sensor antenna unit,
The antenna switching means for switching the antenna connected to the tag information read / write means to the antenna of the objective detection sensor in which the target is detected when the objective detection sensor detects the target. Item 2. A tag information read / write system for a wireless IC tag for identifying tag information and position information of an object according to item 1. Each objective detection sensor has identification information for identifying the sensor / antenna unit,
When the object detection sensor detects the object, the identification number is acquired from the object detection sensor, and the position information of the object is obtained based on the arrangement position information of the sensor / antenna unit corresponding to the identification number. Information recording means for associating and recording tag information and position information related to the object by obtaining tag information read by the tag information read / write means in which the antenna has been switched. The tag information read / write system for a wireless IC tag for specifying tag information and position information of an object according to claim 2.   4. The tag information and position information of an object according to claim 3, further comprising history information creating means for creating history information by recording the position information and the tag information over time. Tag information reading and writing system for wireless IC tag.

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