JP4896928B2 - File management system and file management method - Google Patents

Description

  The present invention relates to a file management system and a file management method for managing files in a cabinet.

Non-patented technology that includes a card reader for ID cards and a reader for IC tags (wireless IC tags) in a cabinet (library) with a door to store important files that contain documents in the box type or binder type It is disclosed in Document 1. The technology of Non-Patent Document 1 is configured such that a user possesses an ID card, and holds the ID card over a card reader of the cabinet to perform collation confirmation to open the cabinet door. The file stored in the cabinet records information on which shelf of the cabinet the IC tag information attached to the file is read by a reader installed for each shelf of the cabinet.
“I-Tag cabinet”, Okamura Manufacturing Co., Ltd., “online”, “May 26, 2008 search”, Internet <URL: http://www.okamura.co.jp/security/ss/d06.html >

  However, in the technique of Non-Patent Document 1 described above, the user must perform an act of reading the ID card used for releasing the cabinet door over a card reader. Here, the IC tag of the file stored in the cabinet, which is used in the above-described technology, operates only at a distance of several centimeters from the reader installed for each shelf. Both the ID card and the IC tag used are passive wireless IC tags having no built-in battery. Therefore, the user needs to hold the ID card over the reader, or pay attention so that the IC tag attached to the file is stored in a predetermined orientation or place in the cabinet so that the reader can read the IC tag. . Furthermore, once the information on the ID card is read by the reader and the cabinet door is released and the door remains open, the files stored in the cabinet are illegally taken out by a third party. It is possible.

  In addition, when a malicious person obtains another person's ID card illegally and takes the file out of the cabinet without permission, the reader installed on the shelf of the cabinet cannot read the IC tag attached to the file. , It is recorded that the owner of the ID card borrowed the file. In particular, once any file has been removed from the cabinet shelf, it is only recorded that the owner of the ID card has borrowed the handling of the file that has been taken out, and no subsequent record is left. . In other words, security is maintained only with an ID card possessed by the user for an illegal act.

In addition to this, when the user returns the file, the orientation of the file and designation so that the position of the IC tag attached to the file to be returned to the cabinet shelf is close to the reader installed on the shelf It is necessary to be aware of which shelves are the return destination shelves. If the file is returned without being conscious of such a situation, the information of the IC tag attached to the file returned to the cabinet is not read by the reader and is erroneously recognized as an unreturned state. In addition, the file management by the cabinet in the technology of Non-Patent Document 1 may not be able to grasp the illegal file export action, and there is a risk that the rental return of the file may be mistaken as an action performed by a normal user . Furthermore, the power used by the cabinet in the technique of Non-Patent Document 1 is a problem. That is, a large-scale reader is required to supply each shelf with power for driving the passive wireless IC tag, and a large cabinet having a plurality of shelves needs to install a large number of readers. Naturally, enormous power is consumed to drive these many readers.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a file management system and a file management method capable of reducing user management effort, improving file management accuracy, and reducing the use cost.

  To achieve the above object, the present invention provides a file having at least a library wireless transmission device attached to a library, a file wireless transmission device attached to a file stored in the library, and a file management device. The archive wireless transmission device transmits an activation request signal that transmits an activation request signal storing identification information of the archive to the file wireless transmission device based on opening or closing of the library door. And the file wireless transmission device receives an activation signal storing the identification information of the library and the identification information of the own device included in the activation request signal when the activation request signal is received. An activation signal transmitting means for transmitting to the management device, wherein the file management device is stored in the activation signal; an activation signal receiving means for receiving the activation signal; The identification information detecting means for detecting the identification information of the archive and the identification information of the file radio transmission device, the identification information of the library and the identification information of the file radio transmission device are stored in association with each other And a file management table generating means for generating a file management table.

  In the file management system described above, the file management table generating means of the file management device may include the identification information of the archive and the identification information of the file wireless transmission device already recorded in the file management table. And the combination of the identification information of the archive stored in the newly received activation signal and the identification information of the wireless transmission device for files, and if they do not match, the file management table The information on the combination of the identification information of the archive and the identification information of the wireless transmission device for files already recorded in the file is deleted, and the identification information of the archive and the file stored in the newly received activation signal are deleted. The information is recorded in the file management table in association with a combination with the identification information of the wireless transmitter.

  Further, the present invention provides the file management system, wherein the file wireless transmission device receives the activation request signal with a β time length and a γ time period (β <γ), and the activation request. After the first transmission of the activation signal after receiving the signal, the activation signal transmission control means for controlling the transmission of the activation signal for the second and subsequent times in a random cycle, and the archive radio transmission device include the activation And an activation request signal transmission control means for periodically transmitting the request signal with an αγ (1 <α <2) time length.

  In the file management system according to the present invention, the library wireless transmission device may be configured to open or close a door of the library, a signal value indicating opening or closing from an opening / closing switch that detects the opening or closing, or And an open / close detection means for detecting based on any one of illuminance values from an illuminance detection device for detecting the illuminance of the library.

  According to the present invention, in the file management system described above, the activation signal transmission control means of the file wireless transmission device transmits the first activation signal after a predetermined time has elapsed since the reception of the activation request signal. It is characterized by.

  In the file management system according to the present invention, the activation signal transmission control means of the file wireless transmission device transmits the first activation signal immediately after receiving the activation request signal. And

  According to the present invention, in the file management system described above, the activation signal transmission control means of the file radio transmission device triggered the transmission of the activation signal for the first time. The activation request signal reception process is performed immediately before the next reception process.

  In the file management system according to the present invention, the activation signal transmission control unit of the file radio transmission device may transmit the first activation signal after a lapse of a random time after receiving the activation request signal. It is characterized by performing.

  According to the present invention, in the file management system described above, the activation signal transmission control means of the file radio transmission device triggered the transmission of the activation signal for the first transmission of the activation signal. It is performed after transmission of the activation request signal in the archive wireless transmission device.

  The present invention is also a file management method in a file management system having at least a library wireless transmission device attached to a library, a file wireless transmission device attached to a file stored in the library, and a file management device. The library wireless transmission device transmits an activation request signal storing the library identification information to the file wireless transmission device based on opening or closing of the library door, and the file wireless transmission device. Triggered by the reception of the activation request signal, the activation signal storing the identification information of the library and the identification information of the own device included in the activation request signal is transmitted to the file management device, and the file management device Receives the activation signal, and the identification information of the archive stored in the activation signal, the identification information of the file wireless transmission device, Detected, a file management method and generates a file management table stored in association with identification information of the identification information and the file for the wireless transmitting device of the archive.

  According to the present invention, in the file management method described above, the file management device further includes a combination of the identification information of the archive already recorded in the file management table and the identification information of the wireless transmission device for files. When the combination of the identification information of the library stored in the received activation signal and the identification information of the file wireless transmission device is compared, and does not match, it is already recorded in the file management table The information on the combination of the identification information of the archive and the identification information of the wireless transmission device for files is deleted, and the identification information of the library and the identification of the wireless transmission device for files stored in the newly received activation signal A combination with information is associated and recorded in the file management table.

  In the file management method according to the present invention, the file wireless transmission device receives the activation request signal by receiving and processing the activation request signal with a β time length and a γ time period (β <γ). After the first transmission of the activation signal later, the second and subsequent transmissions of the activation signal are controlled to be transmitted in a random cycle, and the library radio transmission apparatus transmits the activation request signal to αγ (1 <α <2 ) It is characterized by periodically transmitting in time length.

  According to the present invention, since an active type wireless IC tag is used as a library IC tag or a file IC tag, it is necessary to make a user hold an ID card over a reader, When storing the pasted file, it is not necessary to pay attention to the storage direction of the file, and it is not necessary to pay attention to the position of the shelf storing the specified size. In particular, even after the file is taken out from the archive, the file IC tag attached to the file transmits a UHF signal, and this signal is received by the UHF transceiver, so that the location of the file can be grasped.

  Also, the archive IC tag transmits a UHF signal in which both the ID in the HF signal transmitted from the archive HF transmitter and the ID of the archive IC tag are stored. By transmitting this UHF signal, Certainly, it is possible to grasp which file is stored in which archive. In other words, there is no need to create a list of file storage statuses by another method. Furthermore, since the UHF signal is transmitted from the IC tag for library responding to the HF signal from the portable HF transmitter when the user possesses the portable HF transmitter and approaches the library, the UHF signal is transmitted by portable HF. Whether or not the file 4 desired by the user exists in the vicinity of the user can be grasped based on whether or not the file can be received.

Hereinafter, a file management system according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing the configuration of the file management system according to the embodiment.
As shown in this figure, the file management system includes a file management device 1, a UHF (Ultra High Frequency) transceiver 2, a library IC tag 31 attached to the library 3, and a library HF (High Frequency installed in the library 3. ) Transmitter 32, open / close switch 33 for switching one of the signals for opening / closing the door of library 3, file IC tag 41 attached to file 4 stored in library 3, radio base station apparatus 5, file management system It is composed of a portable HF (High Frequency) transmitter 6 carried by an administrator or a user who uses a file. The file management apparatus 1 is connected to the UHF transceiver 2 and the radio base station apparatus 5 via a communication network. Further, the UHF transceiver 2 and the library IC tag 31 and the file IC tag 41 are connected by wireless communication.

Next, each device constituting the file management system will be described in more detail.
The UHF transceiver 2 is installed in a library room where the library 3 exists. The UHF transceiver 2 receives radio waves (UHF) transmitted from the above-mentioned archive IC tag 31 and file IC tag 41. The transmission information from the archive IC tag 31 and the file IC tag 41 received by the UHF transceiver 2 stores the ID of the confident UHF transceiver 2, and this information is used for file management via the communication network. Transferred to device 1. Further, the file management apparatus 1 transmits instruction information, for example, an instruction to turn on a light emitting diode (LED) mounted on a specific IC tag to the UHF transceiver 2 via a communication network. The UHF transceiver 2 that has received this instruction performs processing such as transmitting the information to the file IC tag 41 or the archive IC tag 31 by radio waves (UHF).

  The library IC tag 31 is attached to each door of the library 3. Note that the library IC tag 31 and the file IC tag 41 are active wireless IC tags with a built-in battery. Further, the archive IC tag 31 detects a situation in which the door of the archive 3 is opened based on information from an illuminance sensor mounted on the tag or the opening / closing switch 33, and a signal including the ID of the stored tag is stored. Transmit by radio wave (UHF). Further, the archive IC tag 31 receives an instruction from the file management device 1 described later via the communication network and the UHF transceiver 2 or from the portable HF transmitter 6. Then, there is a case where a process for lighting the mounted light emitting diode (LED) is performed.

  The library HF transmitter 32 is attached to the door of the library 3. Then, it is detected by a signal from the illuminance sensor (PD) or the door opening / closing switch 33 that the door of the library 3 has been opened. When the archive HF transmitter 32 detects that the door has been opened, it transmits a high frequency (HF) of 13.56 MHz, for example. In the HF signal, the ID of the library HF transmitter 32 attached to the library 3 is stored so that the library 3 with the door opened can be specified.

  The file IC tag 41 is an active wireless IC tag with a built-in battery as described above and attached to the file 4. When a HF signal is received from a later-described archive HF transmitter 32 or portable HF transmitter 6, a predetermined operation is performed. The determined operation is, for example, the ID of the library HF transmitter 32 included in the HF signal received from the library HF transmitter 32 or the portable HF transmitter 6 or the ID of the portable HF transmitter 6 of the own tag. For example, the information signal to which the ID is added is periodically transmitted to the UHF transceiver 2.

  The portable HF transmitter 6 is owned by a user who searches for the file 4 or a manager of the archive. When a user or administrator searches for a file in the archive 3, a high frequency (HF) is transmitted from the portable HF transmitter, and the file IC tag 41 attached to the file 4 is activated. Thus, the file IC tag 41 transmits a signal storing the ID stored therein by radio waves (UHF). The portable HF transmitter 6 receives the UHF signal from the file IC tag 41, and enters the archive 3 near the user from the ID of the file IC tag 41 included in the received UHF signal. Check if the desired file 4 exists. Furthermore, the information of the confirmed file 4 is transmitted to the file management apparatus 1 via a wireless or wired communication network, and the information of the file 4 stored in the archive 3 is updated. Since the file management apparatus 1 saves the information of the file 4 stored in the archive 3, the stored information can be browsed and compared with the file stored in the actual archive 3.

  As described above, the file management device 1 and the portable HF transmitter 6 are connected to the UHF transmitter / receiver 2 and the archive HF transmitter 32 via a wired or wireless communication network. In addition, when the portable HF transmitter 6 communicates with the file management apparatus 1 via the communication network, the radio base station apparatus 5 is required. Between the file management device 1, the portable HF transmitter 6, the UHF transmitter / receiver 2, and the library HF transmitter 32, an instruction signal to the file IC tag 41 and the library IC tag 31, Information transmitted from the IC tag 31 for files and the IC tag 41 for files, or information already recorded in the file management apparatus 1 for the file 4 stored in the archive 3 is transmitted and received.

Next, functions of each device constituting the file management system will be described.
FIG. 2 is a functional block diagram of the file IC tag.
As shown in this figure, the file IC tag 41 includes a radio processing unit 411 that exchanges radio signals with other devices such as the UHF transceiver 2 and the archive HF transmitter 32, and an operation process that determines the operation of the own tag. 412 and a power supply unit 413 that supplies power for operating the own tag. The wireless processing unit 411 is connected to a UHF transmission / reception antenna 4111 that transmits radio signals and an HF reception coil 4112 that receives high-frequency (HF) signals. Further, the file IC tag 41 is equipped with a vibration sensor 414 and a light emitting diode (LED) 415 for detecting a shake or the like when the user takes out the file 4 from the archive 3. The light emitting diode 415 is used for such purposes as turning on the LED so that it can be easily understood when the user searches for the desired file 4 when the door of the stored archive 3 is opened.

In the file IC tag 41, the wireless processing unit 411 includes a UHF transmission / reception unit 4113 that transmits / receives a signal to / from the UHF transmitter / receiver 2 or the portable HF transmitter 6, and a library HF transmitter 32 or a portable HF transmission. An HF receiver 4114 that receives a high frequency (HF) signal from the machine 6 is provided. Here, the HF receiving unit 4114 performs an operation by receiving a constant or intermittent power supply from the power supply unit 413. Further, the UHF transmission / reception unit 4113 operates by receiving power supply from the power supply unit 413 only when the tag operation processing unit 412 needs to make a determination. In the first embodiment and the second embodiment, which will be described later, an example is shown in which the HF reception unit 4114 periodically performs an intermittent HF signal reception process. By periodically performing intermittent HF signal reception processing, the power supply is stopped while the intermittent short reception processing is stopped, so that further power saving is possible.

  Further, the operation processing unit 412 includes a tag control unit 4122 that receives various information from the wireless processing unit 411 and information on shaking detected by the vibration sensor 414. The tag control unit 4122 performs a process of issuing an information transmission instruction to the wireless processing unit 411 or turning on the light emitting diode 415 based on various information received from the wireless processing unit 411 and the vibration sensor 414. In addition, the operation processing unit 412 includes a tag ID storage unit 4121 that stores an ID for identifying the file IC tag 41 itself, and the tag control unit 4122 reads out its own ID from the tag ID storage unit 4121 to perform wireless communication. The data is transmitted to the processing unit 411, and the wireless processing unit 411 performs processing of transmitting a radio wave (UHF) signal storing the ID. The power supply unit 413 supplies power to each processing unit of the file IC tag. As described above, power is always supplied to the tag control unit 4122. Further, the HF receiving unit 4114 may be constantly supplied with power from the power supply unit 413 or may be supplied intermittently. By supplying power intermittently, as described above, the supply of power stops intermittently, so that power consumption can be saved. Further, power is supplied from the power supply unit 413 to the UHF transmission / reception unit 4113 and the light emitting diode 415 only when the tag control unit 4122 determines that they are necessary. In FIG. 2, a battery, particularly a coin-type battery is shown as the power supply unit 413.

  In the file IC tag 41, the UHF transmission / reception antenna 4111 is connected to the UHF transmission / reception unit 4113 of the file IC tag 41 as described above. When the UHF transmission / reception unit 4113 exchanges radio wave (UHF) signals with other devices, the UHF transmission / reception antenna 4111 is used. Similarly, the HF receiving coil 4112 is also connected to the HF receiving unit 4114 of the file IC tag 41 as described above, and a high frequency (HF) signal is transmitted / received to / from other devices via the HF receiving coil 4112.

  The vibration sensor 414 may be of a type that detects whether or not the file IC tag 41 is shaken or a type such as an acceleration sensor that detects how much acceleration is applied in which direction. The light-emitting diode 415 may be mounted, for example, as a type that emits only a single color of red, or a type that can emit a plurality of different colors, such as three colors of red, yellow, and green. For the vibration sensor 414 and the light emitting diode 415, if the file IC tag 41 is to be constructed at a low cost, the former can be selected together, and the file IC tag 41 can be grasped in detail from the shaking of the file IC tag 41 or the wireless IC The latter is preferred when considering various situations of the tag with the light emitting diode 415.

FIG. 3 is a functional block diagram of the archive IC tag.
As shown in this figure, the library IC tag 31 includes a wireless processing unit 311 for exchanging wireless signals, an operation processing unit 312 for determining the operation of the own tag, and a power supply unit 313 for supplying power for operating the own tag. It has. The library IC tag 31 includes a UHF transmission / reception antenna 3111 for transmitting / receiving radio waves (UHF) of radio signals, and an HF reception coil 3112 for receiving high frequency (HF) signals. Further, the library IC tag 31 includes a vibration sensor 314 that detects shaking and a light emitting diode (LED) 315 that displays the status of the library IC tag 31. The library IC tag 31 includes an illuminance sensor (PD) 316 that can detect a dark state in which the door is closed in the library 3 and a bright state when the door is opened. Alternatively, the library IC tag 31 is directly connected to an open / close switch 33 that detects the open / closed state of the door of the library 3.

  The radio processing unit 311 of the library IC tag 31 includes a UHF transmission / reception unit 3113 that transmits / receives a UHF signal to / from the UHF transmitter / receiver 2 or the portable HF transmitter 6, a library HF transmitter 32, or a portable HF transmitter. 6 includes an HF receiving unit 3114 for receiving an HF signal. Further, in the IC tag 31 for library, in the supply of power to the tag UHF transmission / reception unit 3113 and the HF reception unit 3114, the HF reception unit 3114 receives the normal or intermittent supply of power from the power supply unit 413. Do. In addition, power is supplied to the UHF transmission / reception unit 3113 only when the operation processing unit 312 determines that it is necessary. In the first embodiment and the second embodiment described later, an example is shown in which the HF receiver 3114 periodically performs intermittent HF signal reception processing. By periodically performing intermittent HF signal reception processing, the power supply is stopped while the intermittent short reception processing is stopped, so that further power saving is possible.

  Further, the operation processing unit 312 includes information received from the wireless processing unit 311, information on shaking detected by the vibration sensor 314, information on brightness detected by the illuminance sensor 316, status of the door from the open / close switch 33, and the like. A tag control unit 3122 that receives the information and determines the operation of the archive IC tag 31 itself is provided. The operations determined by the tag control unit 3122 include a UHF signal transmission instruction to the UHF transmission / reception unit 3113 and a lighting instruction to the light emitting diode 315. In the UHF signal transmission instruction to the UHF transmission / reception unit 3113, the ID for identifying the library 3 is read from the tag ID storage unit 3121 in the operation processing unit 312 and processing for storing this ID in the transmitted UHF signal is performed. There is a case. The power supply unit 313 is a battery, and FIG. 3 shows a coin-type battery. In addition, the power supply unit 313 always supplies power to the tag control unit 3122, and the HF reception unit 3114 may be supplied with power constantly from the power supply unit 413, or may be supplied intermittently. . By supplying power intermittently, as described above, the supply of power stops intermittently, so that power consumption can be saved. Further, power is supplied to the UHF transmission / reception unit 3113 and the light emitting diode 315 only when the tag control unit 3122 determines that it is necessary.

  Also, the UHF transmission / reception antenna 3111 of the IC tag for archive 31 is connected to the UHF transmission / reception unit 3113, and UHF transmission / reception antenna 3111 transmits / receives UHF signals to / from other devices. The HF receiver coil 3112 is connected to the HF receiver 3114 and receives HF signals from other devices via the HF receiver coil 3112. Further, the vibration sensor 314 of the library IC tag 31 is of a type that detects whether or not the library IC tag 31 is shaken, or a type such as an acceleration sensor that detects how much acceleration is applied in which direction. Conceivable. The light emitting diode 315 can be mounted, for example, as a type that emits only a single color of red, or a type that can emit a plurality of different colors such as three colors of red, yellow, and green with one light emitting diode 315. The illuminance sensor 316 can detect the brightness when the door is opened and the darkness in the library 3 when the door is closed, and can grasp the open / close state of the door of the library 3 based on the difference between the detected values of the brightness and the darkness. . The open / close switch 33 is attached to the door of the library 3 or the frame of the door. When the door is closed, the state of the open / close switch becomes “On”, and when the door is opened, the open / close switch becomes “Off”. To do. The library IC tag 31 can detect shaking at the moment when the door of the library 3 is opened and closed by the above-described vibration sensor 314, and the open / close state of the library 3 door detected by the illuminance sensor 316 or the open / close switch 33. Can be transmitted by the UHF signal.

FIG. 4 is a functional block diagram of the archive HF transmitter.
The library HF transmitter 32 includes a wireless processing unit 321 that transmits a wireless signal to a wireless IC tag (the library IC tag 31 and the file IC tag 41), and an operation processing unit 322 that determines the operation of the library HF transmitter 32 itself. A power supply unit 323 that supplies power for operating the archive HF transmitter 32, and an external connection processing unit 324 that exchanges information with the file management device 1 and the like. The library HF transmitter 32 includes an HF transmission coil 325 and an illuminance sensor 326 that detects brightness and darkness. Alternatively, the archive HF transmitter 32 may be connected to an open / close switch 33 that directly grasps the open / closed state of the door of the archive 3. The wireless processing unit 321 includes an HF transmission unit 3211 that transmits a high frequency (HF) signal. In addition, the operation processing unit 322 includes a transmitter control unit 3221 that receives detection of the open / closed state of the door by the illuminance sensor 326 or the open / close switch 33, an instruction from the file management apparatus 1 from the external connection processing unit 324, and a library HF transmitter An ID storage unit 3222 storing an ID for identifying 32 is provided. The ID of the archive HF transmitter 32 is read by the transmitter control unit 3221 and instructs the wireless processing unit 321 to transmit the HF signal including this ID.

  The power supply unit 323 is a battery, and FIG. 4 shows a commercially available AA battery. The power supply unit 323 supplies power to the HF transmission unit 3211, the transmitter control unit 3221, and the net interface 3241 of the external connection processing unit 324 described later. A network interface 3241 provided in the external connection processing unit 324 processes information exchanged between the transmitter control unit 3221 and other devices on the communication network. In particular, the network interface 3241 passes an instruction from the file management apparatus 1 connected to the communication network to the transmitter control unit 3221. Here, specifically, the net interface 3241 is the brightness detected by the illuminance sensor 326 of the archive HF transmitter 32 when the door is opened and closed, information on the opening and closing of the door detected by the opening and closing switch 33, or Various other information output by the sensor group is notified to the file management apparatus 1 through the communication network. The network interface 3241 receives various commands for operating the HF transmission unit 3211 of the archive HF transmitter 32 from the file management apparatus 1 side via the communication network. For example, a wireless IC tag activation (UHF signal) command for confirming the existence of one or a plurality of file IC tags 41 or archive IC tags 31 to be controlled, or UHF signal transmission is forcibly stopped. The network interface 3241 receives information for remote control in accordance with a user instruction such as a command to be executed. The HF transmission coil 325 transmits a high frequency (HF) signal generated in the HF transmission unit 3211 to the wireless IC tag (the IC tag 31 for archive or the IC tag 41 for file). The illuminance sensor 326 and the opening / closing switch 33 transmit a signal indicating whether the door of the library 3 is opened or closed to the transmission control unit 3221, and the transmission control unit 3221 detects the opening / closing of the door. The transmission control unit 3221 transmits an HF signal including the ID of the library HF transmitter 32 to the wireless IC tag based on whether the door of the library 3 is open or closed. For example, when the archive door is open, an HF signal storing its own ID is transmitted, and when the archive door is closed, the archive HF transmitter 32 stops transmitting the HF signal. . Or, conversely, when the archive door is closed, the HF signal is transmitted. When the archive door is open, the archive HF transmitter 32 transmits the HF signal storing its own ID. May be stopped.

FIG. 5 is a functional block diagram of the portable HF transmitter.
The portable HF transmitter 6 includes a wireless processing unit 61 that exchanges information with the file IC tag 41 and the library IC tag 31, an operation processing unit 62 that determines the operation of the portable HF transmitter 6, and A user interface unit 63 that receives display information output and operation information input and a power supply unit 64 that supplies power are provided. Further, the portable HF transmitter 6 communicates information with a wireless IC tag such as an external connection processing unit 65 and a file IC tag 41 for exchanging information with other devices connected to the communication network. Are provided with a UHF transmission / reception antenna 66 for transmitting / receiving and an HF transmission coil 67 for transmitting information by an HF signal.

  In the portable HF transmitter 6, the wireless processing unit 61 includes a UHF transmission / reception unit 611 that transmits / receives UHF signals to / from a wireless IC tag such as the file IC tag 41, and HF transmission that transmits an HF signal to the wireless IC tag. Part 612 is provided. The operation processing unit 612 receives information received from the wireless IC tag through the UHF transmission / reception unit, user instruction information from the user interface unit 63, and information from the file management apparatus 1 through the external connection processing unit 65. A transmitter control unit 621 is provided. The operation processing unit 62 also includes an ID storage unit 622 that stores an ID for identifying the portable HF transmitter 6, and the transmitter control unit 621 reads the ID written in the ID storage unit 622 and includes the ID. The HF signal is transmitted from the HF transmission unit 612 or is transmitted from the UHF transmission / reception unit 611 using the UHF signal. In the portable HF transmitter 6, the user interface unit 63 includes a monitor display unit 631 that shows various information received by the portable HF transmitter 6 to the user, and instructions for the user to give instructions to the portable HF transmitter 6. An operation input unit 632 is provided.

  The power supply unit 64 of the portable HF transmitter 6 includes a UHF transmission / reception unit 611 and an HF transmission unit 612 in the wireless processing unit 61, a transmitter control unit 621 in the operation processing unit 62, a monitor display unit 631 in a user interface unit, and a later-described unit. Power is supplied to the wireless communication interface 651 of the external connection processing unit 65. FIG. 5 shows an example in which the power supply unit 64 is a battery. The external connection processing unit 65 includes a wireless communication interface unit 651 that performs connection processing to a communication network such as the Internet by wireless communication. The UHF transmission / reception antenna 66 transmits / receives a UHF signal between the UHF transmission / reception unit 611 and the wireless IC tag. Further, the HF transmission coil 67 transmits the signal transmitted from the HF transmission unit 612 to the wireless IC tag by an HF signal. In particular, when the user carries the portable HF transmitter 6 and searches for a desired file, the portable HF transmitter 6 sends an HF signal to the file IC tag 41 attached to the file 4 from the HF transmission coil 67. Send. The file IC tag 41 near the periphery of the portable HF transmitter 6 that has received this HF signal returns a signal storing its own ID by the UHF signal. Then, the portable HF transmitter 6 receives the UHF signal via the UHF transmission / reception antenna 66, whereby the user can confirm from the monitor display unit 631 whether the desired file 4 is nearby.

FIG. 6 is a functional block diagram of the UHF transceiver.
The UHF transceiver 2 determines an operation by receiving a wireless processing unit 21 that exchanges UHF signals with a wireless IC tag, a signal from the wireless IC tag, and information from the file management apparatus 1 via a communication network. An operation processing unit 22, a power supply unit 23 that supplies power for operating the UHF transceiver 2, and an external connection processing unit 24 that exchanges information such as instructions with the file management apparatus 1 via a communication network are provided. ing. Further, a UHF receiving antenna 25 that receives a UHF signal from the wireless IC tag and a UHF transmitting antenna 26 that transmits the UHF signal to the wireless IC tag are provided.

  In the UHF transceiver 2, the wireless processing unit 21 includes a UHF receiving unit 211 that receives and processes a UHF signal transmitted from the wireless IC tag, and a UHF transmitting unit 212 that transmits a UHF signal for instructing the wireless IC tag. It has. The operation processing unit 22 includes a control unit 221 that receives a signal from the wireless IC tag via the UHF reception unit 211 and outputs an instruction to the wireless IC tag through the UHF transmission unit 212. When the control unit 221 receives a signal from the wireless IC tag, the control unit 221 transmits the information to another device connected to the communication network via the external connection processing unit 24, or from the file management apparatus 1 via the communication network. , For example, a command to turn on the light emitting diode 415 of the file IC tag 41 pasted on a file 4, and a process of transmitting the contents to the file IC tag 41. Here, when the signal received from the file IC tag 41 is transmitted to the file management apparatus 1 via the communication network, the operation processing unit 22 identifies the UHF transceiver 2 recorded in the ID storage unit 222. The information added with is sent to the file management apparatus 1.

  The power supply unit 23 supplies power to the UHF reception unit 211 and the UHF transmission unit 212 of the wireless processing unit 21, the control unit 221 of the operation processing unit 22, and the net interface 241 of the external connection processing unit 24. FIG. 6 shows that the power source of the power supply unit 23 is commercial AC 100V. The external connection processing unit 24 is a net interface 241 that transmits and receives information between the control unit 221 and other devices connected to the communication network. The UHF receiving unit 211 described above receives a UHF signal transmitted from the wireless IC tag via the UHF receiving antenna 25. Further, the UHF transmission unit 212 transmits a UHF signal to the wireless IC tag via the UHF transmission antenna 26.

  In addition to the devices shown in FIGS. 2 to 6, in the file management system shown in FIG. 1, the portable HF transmitter 6 is connected to a communication network, the wireless communication base station 5, and the portable HF transmission. It has a file management device 1 that manages information from the device 6 and information on the wireless IC tag obtained by the UHF transceiver 2.

(First embodiment)
Next, the processing flow of the file management system will be described.
FIG. 7 is a diagram showing an outline of processing in the file management system in the first embodiment.
First, the first process of the file management system when the door of the archive 3 is opened and closed will be described with reference to FIG. Specifically, referring to FIG. 7, tag HF signal reception, tag UHF signal transmission, HF signal transmission by library HF transmitter 32, portable HF, which are the operations of file IC tag 41 and archive IC tag 31. Each operation of HF signal transmission by the transmitter 6 will be described. In the signal transmission and reception operations of these devices, FIG. 7 shows that time advances in the right direction with the horizontal axis as the time axis. In FIG. 7, the vertical axis of each transmission signal such as tag HF signal reception, tag UHF signal transmission, archive HF signal transmission, and portable HF signal transmission indicates the electrolytic strength of the signal. In FIG. 7, an arrow on the left side from the center indicates a time zone when the library 3 closes the door, and an arrow on the right side from the center indicates a time zone when the library 3 opens the door.

  First, the file IC tag 41 and the archive IC tag 31 similarly repeat the operation of periodically receiving the HF signal. This periodic HF signal reception processing is shown in the time series of “tag HF signal reception” at the top of FIG. In this embodiment, as shown in FIG. 7, the reception interval of the tag HF signal is 1 sec (seconds), and the time width for one reception of the HF signal by the file IC tag 41 or the archive IC tag 31 Is 1 msec (milliseconds). Here, in general, when the reception interval of the tag HF signal is expressed as γ [sec] and the time width for receiving one HF signal is expressed as β [sec], the transmission of the tag HF signal so as to satisfy β <γ. Suppose that processing is to be performed. In this embodiment, since β = 1 msec and γ = 1 sec, there is a difference of 1000 times. By doing so, the power consumption can be greatly reduced compared to the case where the file IC tag 41 and the archive IC tag 31 are controlled to receive the HF signal in a receiving state.

  Next, the transmission of the UHF signal of the file IC tag 41 and the library IC tag 31 is shown in time series in the “tag UHF signal transmission” stage of the second stage in FIG. Here, normally, the file IC tag 41 and the archive IC tag 31 do not perform the tag UHF signal transmission process. That is, when an HF signal transmitted from another device to be described later is received at the timing of receiving the tag HF signal described above, the file IC tag 41 or the archive IC tag 31 that has received the HF signal receives the tag UHF. An operation for transmitting a signal is performed. The transmission of the tag UHF signal will be described below after describing the transmission processing of the HF signal from another device.

  The HF signal is transmitted by the archive HF transmitter 32 or the like. For example, the HF signal transmission operation of the archive HF transmitter 32 is shown in time series in the third stage “archive HF signal transmission” in FIG. The archive HF transmitter 32 detects when the archive 3 door is opened by the illumination sensor 326 or the open / close switch 33 mounted on the archive HF transmitter 32 when the archive 3 door is opened. To do. When the illuminance sensor 326 or the open / close switch 33 detects that the door of the library 3 has been opened, the library HF transmitter 32 transmits a library HF signal. The transmission of the library HF signal by the library HF transmitter 32 is continuously performed with a time width of 1.2 sec when it is determined that the door is opened. Further, the library HF transmitter 32 repeatedly transmits the ID of the library HF transmitter 32 repeatedly by the HF signal during the HF signal transmission process during the 1.2 sec time width. . For example, it is assumed that the archive HF transmitter 32 repeats ID transmission by the HF signal 1800 times within 1.2 sec of transmission of the archive HF signal. The HF signal transmission from the archive HF transmitter 32 and the repeated operation of receiving the tag HF signal at every 1 sec interval described above in the file IC tag 41 and the archive IC tag 31 are mostly archives. The file IC tag 41 and the archive IC tag 31 can receive the HF signal by one HF signal transmission processing from the HF transmitter 32.

  When the door of the library 3 is left open, the library HF transmitter 32 periodically transmits a tag HF signal. For example, in the present embodiment, the library HF transmitter 32 repeats transmission of an HF signal that lasts 1.2 seconds at intervals of 60 seconds. In general, using a coefficient α of 1 <α (coefficient) <2 with respect to the reception interval γ [sec] (= 1 sec) determined in the previous tag HF signal reception, the time width of the archive HF signal transmission is expressed as αγ. It is calculated by [sec]. In this embodiment, α = 1.2, γ = 1, and αγ = 1.2. In addition, the transmission interval of the HF signal transmission is repeated at intervals of several tens to several hundred times the time width αγ [sec] of the HF signal transmission of the present embodiment. As shown in FIG. 7, the time interval of HF signal transmission by the library HF transmitter 32 of the present embodiment is 60 sec, which is ω (= 50) times the time width αγ = 1.2 of HF signal transmission.

  Here, referring to the electric field strength corresponding to the time-series vertical axis shown in FIG. 7, compared with the vertical axis of the tag UHF signal transmission described in the second stage of FIG. 7, the library HF described in the third stage of FIG. It can be seen that the electric field strength of signal transmission is weak and weak wireless strength. There are two reasons for this. That is, one of the reasons why the field strength of the library HF signal is set to be weak is to limit the range in which the library HF signal reaches to the range with the door of the library 3 attached. This prevents the file IC tag 41 attached to the file 4 in the other archive 3 from reacting by transmitting the archive HF signal, and the archive HF signal is always transmitted to the archive HF transmitter that has transmitted the signal. The file IC tag 41 attached to the file 4 stored in the same archive 3 as the archive 3 in which 32 is installed is controlled to react. The second reason for setting the field strength of the library HF signal to be weak is that the transmission of the library HF signal is driven by a battery, so that it is necessary to suppress power consumption. The library HF signal shown in FIG. 7 has a transmission time width αγ (= 1.2 sec), and its electric field strength is weak wireless strength. This power is indicated by the area of a rectangular wave in FIG. If this area is small, power consumption can be reduced. Therefore, since the transmission time width αγ is roughly determined, by reducing the electric field strength to the same level as the weak radio, the power consumption is reduced and the long life of the library HF transmitter 32 is realized.

As for the transmission of the tag UHF signal of the file IC tag 41 or the library IC tag 31, the timing at which the process of receiving the tag HF signal from the library HF transmitter 32 is performed once. After receiving at . The transmission process of the tag UHF signal is repeatedly performed for a predetermined time by the file IC tag 41 and the library IC tag 31 after confirming the reception of the HF signal from the library HF transmitter 32. In the present embodiment, as shown in FIG. 7, the interval at which the UHF signal transmission (time series of the second stage tag UHF signal transmission in FIG. 7) is repeated in the file IC tag 41 and the archive IC tag 31 is approximately 4 times. ˜8 sec (the rectangle of the signal extending upward in the time series of tag UHF signal transmission in the second stage of FIG. 7). Then, the file IC tag 41 or the archive IC tag 31 repeats the process when the archive HF signal cannot be received again even after a predetermined time has elapsed since the last reception of the archive HF signal in the UHF signal reception process. The UHF signal transmission process is stopped.

In the second stage tag UHF signal transmission process of FIG. 7, based on the archive HF signal transmission, the file IC tag 41 and the archive IC tag 31 receive the tag HF signal reception process, and UHF This shows that signal transmission is started (a signal rectangle extending upward in the second stage time series in FIG. 7). Further, it is shown that the UHF signal transmission is repeated every 4 to 8 seconds after the UHF signal transmission. Here, the time interval of 4 to 8 seconds of UHF signal transmission in each of the file IC tag 41 and the archive IC tag 31 is not constant, and the function ε _t that changes randomly is set as 3 <ε _t <7, The time interval of the tag UHF signal transmission is determined by calculating ε _t αγ [sec]. That is, according to the method for calculating the time interval of UHF signal transmission, the transmission time interval of repeated UHF transmission changes in each of the file IC tag 41 and the archive IC tag 31. By introducing this change in the transmission time interval, collision of UHF signals transmitted from a large number of file IC tags 41 and archive IC tags 31 can be avoided as much as possible, and a large number of file IC tags 41 in the UHF transceiver 2 can be avoided. Or the UHF signal from the library IC tag 31 can be received. In addition, the UHF signal transmitted from the file IC tag 41 or the archive IC tag 31 is transmitted by the file IC tag 41 or the archive IC tag 31 that transmits the signal storing the ID of the tag itself. Further, the file IC tag 41 and the archive IC tag 31 have the archive HF transmitter 32 stored in the signal when receiving the archive HF signal that triggered the transmission of the UHF signal. The ID is read, stored in the UHF signal, and transmitted. As a result, it is detected which archive IC tag 41 or archive IC tag 31 in which archive has transmitted the UHF signal based on the reception of the HF signal transmitted from which archive HF transmitter 32. It becomes possible.

In the third stage time series of FIG. 7, the transmission process of the archive HF signal by the archive HF transmitter 32 when the door of the archive 3 is opened has been described, but the portable HF transmitter 6 transmits the HF signal. Will be described next.
The situation in which the portable HF transmitter 6 performs HF signal transmission processing is shown in the time series at the bottom of FIG. When the portable HF transmitter 6 performs HF signal transmission processing, the time interval of HF signal transmission is αγ (= 1.2 [sec]), as in the HF signal transmission by the previous HF transmitter 32 for archives. Set. The time interval of the HF signal transmission is set as 1 <α <2 as in the case of the archive HF transmitter 32, and the HF signal reception processing interval is set to γ = 2 in the file IC tag 41 and the archive IC tag 31. Set to 1 [sec]. Thereby, in the tag HF signal reception processing in the file IC tag 41 or the library IC tag 31, the signal can be received by one HF signal transmission from the portable HF transmitter 6 in most cases. When the file IC tag 41 or the archive IC tag 31 receives the HF signal by one HF signal transmission by the portable HF transmitter 6, the file IC tag 41 or the archive IC tag 31 Unlike the case of repeated UHF signal transmission based on the reception of the HF signal from the archive HF transmitter 32, the UHF signal transmission process is performed only once. An example of UHF signal transmission processing based on reception of an HF signal transmitted from the portable HF transmitter 6 in the file IC tag 41 or the archive IC tag 31 extends to the lower side in the second stage of FIG. Shown in signal rectangle. Also in the UHF signal transmission of the file IC tag 41 or the archive IC tag 31 based on the HF signal transmission of the archive HF transmitter 32, the file IC tag 41 or the archive IC tag 31 itself includes the signal. The stored ID and the ID of the portable HF transmitter 6 stored in the HF signal transmitted by the portable HF transmitter 6 are stored.

  Further, in the present embodiment, as shown in FIG. 7, the transmission timing of the UHF signal of the file IC tag 41 or the archive IC tag 31 is determined after the archive HF signal is received by the tag HF signal reception process. After a certain time, the first tag UHF signal transmission process is performed. This fixed time (shown as “fixed” in FIG. 7) is set to be shorter than the time interval γ of the tag HF signal reception processing repetition (fixed <γ), for example, set to 0.25 sec. Yes. Further, the file IC tag 41 and the library IC tag 31 receive the portable HF signal by the portable HF transmitter 6 in the tag HF signal reception process, and perform the process of transmitting the tag UHF signal after a certain time. Here, the transmission timing of the tag UHF signal in the file IC tag 41 or the archive IC tag 31 based on the reception of the HF signal from the archive HF transmitter 32 or the portable HF transmitter 6 is the archive HF transmitter 32. In addition to the method of performing a certain time after the reception of the HF signal from the portable HF transmitter 6, several methods are conceivable. Another method for setting the transmission timing of these tag UHF signals will be described with reference to FIGS.

FIG. 8 is a diagram illustrating a second example of the transmission timing of the tag UHF signal according to the first embodiment.
The tag UHF signal transmission timing described in FIG. 8 shows an example in which the tag UHF signal transmission timing is set immediately after the file IC tag 41 or the archive IC tag 31 receives the HF signal.
In FIG. 8, as in FIG. 7, the left side from the center of the diagram indicates the time zone when the library 3 closed the door, and the right side from the center indicates the time zone when the library 3 opened the door. . In the tag HF signal reception process by the file IC tag 41 or the archive IC tag 31, the tag HF signal is received with a time width of β [sec] (= 1 msec), and the tag HF signal reception interval is γ [ sec] (= 1 sec). Further, the library HF signal or the portable HF signal is transmitted with a weak wireless and a time width of αγ [sec] (= 1.2 sec, 1 <α <2). These HF signals are received by the tag HF signal reception process in the previous file IC tag 41 and archive IC tag 31. The operation of each device so far is the same as in FIG. Thereafter, the file IC tag 41 and the archive IC tag 31 transmit a tag UHF signal. The difference between FIGS. 8 and 7 is that the tag UHF in the file IC tag 41 and the archive IC tag 31 is different. The signal transmission process is performed immediately after receiving the library HF signal or the portable HF signal.

  The advantage of the transmission timing of the tag UHF signal in FIG. 8 is that the file IC tag 41 and the archive IC tag 31 that perform the UHF signal transmission processing after receiving the HF signal need only simple operation control. The operation control in FIG. 8 is simpler than performing UHF signal transmission after a certain interval from HF signal reception shown in FIG. 7 because it is not necessary to measure transmission timing. If such a process is applied to the file IC tag 41 or the archive IC tag 31, it is possible to perform manufacturing / control setting and the like at low cost because of simple operation control. Conversely, as a disadvantage of processing the tag UHF signal transmission immediately after the reception of the HF signal as shown in FIG. 8, the tag UHF signal is transmitted from the wireless IC tag when the transmission of the HF signal is not completed on the HF transmitter side. It is most likely. That is, for example, in the case of the portable HF transmitter 6, the tag UHF from the file IC tag 41 or the library IC tag 31 triggered by the HF signal transmission processing in the portable HF transmitter 6 and the reception of the HF signal transmission. The signal reception process overlaps in time. Therefore, the performance of the portable HF transmitter 6 needs to be able to process these two operations simultaneously. Incidentally, in the method of FIG. 7, the file IC tag 41 and the library IC tag 31 transmit the UHF signal after a certain time (for example, fixed = 0.25 sec) after the reception of the HF signal transmitted from the portable HF transmitter 6. Therefore, the possibility that the file IC tag 41 and the library IC tag 31 transmit the UHF signal at a timing slightly before the portable HF transmitter 6 completes the transmission of the HF signal is low.

Another disadvantage of the transmission timing of the tag UHF signal in FIG. 8 is that when a large number of files 4 are stored in the same archive 3, if a plurality of tag UHF signals are transmitted at the same time, the tags UHF are transmitted. When the signals collide, the device that receives the signals cannot receive the UHF signal. That is, a large number of file IC tags 41 in the archive 3 receive the archive HF signal and a plurality of tag UHF signals may be simultaneously transmitted at a certain rate, so that signal collision occurs. This UHF signal collision also occurs in the method of FIG. The number of files stored in the same library 3 for avoiding the collision of the tag UHF signal is related to the ratio of the time width β [sec] of the tag HF signal reception and the repetition interval γ [sec]. That is, in FIG. 8, the tag HF signal reception time width is 1 msec, and the tag HF signal reception repetition interval is 1 sec, so the ratio is 1000 times. Therefore, if the number of files stored in the same library 3 is about 200 to 300, it is possible to largely avoid the collision of a plurality of tag UHF signals. Even if the first tag UHF signal cannot be read due to a collision, the tag UHF signal transmission process is performed at a random time interval ε _t αγ (a function ε _t that changes randomly here is set to 3 <ε _t Since it is repeated at <7 and setting), the collision of signals in the subsequent tag UHF signal transmission process is avoided. The operation of repeating the tag UHF signal transmission process at random time intervals ε _t αγ in this way is the same in both FIG. 8 and FIG.

FIG. 9 is a diagram illustrating a third example of the transmission timing of the tag UHF signal according to the first embodiment.
The tag UHF signal transmission timing described in FIG. 9 is transmitted immediately before the timing at which the file IC tag 41 or the archive IC tag 31 performs the next HF signal reception process after receiving the HF signal. An example of setting timing is shown.
As in the previous FIGS. 7 and 8, also in FIG. 9, the left side from the center of the figure indicates the time zone when the library 3 closed the door, and the right side from the center the library 3 opened the door. Indicates the time zone. Similarly to FIGS. 7 and 8, also in the process of FIG. 9, in the process of receiving the tag HF signal by the file IC tag 41 or the archive IC tag 31, the signal reception process is set to β [sec] (= 1 msec), and the tag HF signal reception interval is repeated at γ [sec] (= 1 sec). Further, it is assumed that the HF signal by the archive HF signal transmission or the portable HF signal transmission is transmitted with a weak radio and a time width of αγ [sec] (= 1.2 sec, 1 <α <2). The operation of each device of the file management system described with reference to FIG. 9 is the same as that in FIGS. Thereafter, the file IC tag 41 and the archive IC tag 31 transmit the tag UHF signal. The difference between FIG. 7 and FIG. 8 and FIG. 9 is that the file IC tag 41 and the archive IC tag. The tag UHF signal transmission process at 31 is a point in which the tag UHF signal transmission timing is set immediately before the timing of performing the next HF signal reception process after reception of the HF signal by archive HF signal transmission or portable HF signal transmission. .

  As the merit of the method for setting the transmission timing of the tag UHF signal according to FIG. 9, the simplest operation control file IC tag 41 or archive IC tag 31 that transmits the UHF signal immediately after receiving the HF signal of FIG. However, it is relatively simple. That is, the wireless IC tag (file IC tag 41 or archive IC tag 31) originally has a function of repeatedly receiving HF signals, and the repetition interval is constant, so that the next HF signal receiving process is performed. The operation control for transmitting the UHF signal immediately before can be realized relatively easily. By causing the file IC tag 41 and the archive IC tag 31 to perform the method as shown in FIG. 9, since the operation control is relatively simple, it becomes possible to perform manufacturing / control setting at a low cost. .

  Also, in the tag UHF signal transmission timing setting method described in FIG. 9, unlike the case of FIG. 8, after the HF signal transmission from the portable HF transmitter 6 or the like is completed, the file IC tag 41 or the archive IC tag 31 is used. Is likely to transmit a tag UHF signal. Particularly in the case of the portable HF transmitter 6, the two operations of the HF signal transmission processing in the HF transmitter and the reception processing of the tag UHF signal from the wireless IC tag do not overlap in time. Therefore, as a performance of the portable HF transmitter 6, there is a point that these two operations may not be processed at the same time. On the other hand, the demerit of the transmission timing setting method of the tag UHF signal described in FIG. 9 is similar to the transmission timing setting method of the tag UHF signal (method of transmitting the tag UHF signal immediately after receiving the HF signal) in FIG. When a large number of files 4 are stored in the same library 3, there is a high possibility that the signals collide due to the transmission of a plurality of tag UHF signals at the same time and the signals cannot be read on the receiving side. However, if the file 3 of about 200 to 300 is stored in the archive 3, the time width of the tag HF signal reception is 1 msec, and the repetition interval of the tag HF signal reception is 1 sec. Since the ratio is 1000 times, collision of a plurality of tag UHF signals can be largely avoided. Further, the operation of transmitting the tag UHF signal in FIG. 9 is repeated at random intervals as in FIGS. Therefore, even when a signal collision occurs in the first tag UHF signal transmission and cannot be read, the tag UHF signal transmission is repeated thereafter at random time intervals, and the collision is avoided in the subsequent tag UHF signal transmission.

FIG. 10 is a diagram illustrating a fourth example of the transmission timing of the tag UHF signal according to the first embodiment.
The transmission timing of the tag UHF signal described in FIG. 10 shows an example in which the UHF signal is transmitted after a lapse of a random time after the file IC tag 41 or the archive IC tag 31 receives the HF signal. Yes.
As in the previous FIGS. 7 to 9, in FIG. 10, the left side from the center of the drawing indicates the time zone when the library 3 closed the door, and the library 3 opens the door by the right arrow from the center. Indicates the time zone. Similarly to FIGS. 7 to 9, in the processing of FIG. 10, in the tag HF signal reception processing by the file IC tag 41 or the archive IC tag 31, the tag HF signal reception is set to β [sec] (= 1 msec. ), And the tag HF signal reception interval is repeated at γ [sec] (= 1 sec). Further, the library HF signal or the portable HF signal is transmitted with a weak wireless and a time width of αγ [sec] (= 1.2 sec, 1 <α <2). The operations of each device of the file management system described with reference to FIG. 10 are the same as those in FIGS. Thereafter, the file IC tag 41 and the archive IC tag 31 transmit the tag UHF signal. The difference between FIGS. 7 to 9 and FIG. 10 is that the file IC tag 41 and the archive IC tag are the same. The tag UHF signal transmission processing at 31 is performed after a lapse of random time after reception of the HF signal by archive HF signal transmission or portable HF signal transmission.

  The merit of the method of setting the transmission timing of the tag UHF signal according to FIG. 10 is that in FIG. 7 to FIG. In such a case, these signals collide and the signal cannot be read on the receiving side of the signal, but this can be avoided. That is, in FIG. 10, even when a plurality of wireless IC tags (file IC tag 41 and archive IC tag 31) simultaneously receive the HF signal, it is random to transmit the tag UHF signal in each wireless IC tag. Since after a lapse of time, the possibility that these UHF signals collide is reduced. As a result, more files 4 can be stored in the archive 3. Also, the tag UHF signal transmission operation of FIG. 10 is repeated in the same manner as in FIGS. Therefore, even if the tag UHF signal transmitted first collides and cannot be read on the receiving side, the tag UHF signal transmission process is repeated at random time intervals, thereby avoiding the collision of the tag UHF signal. Is done.

  Further, the tag UHF signal transmission timing setting method according to FIG. 10 is higher than the tag UHF signal transmission timing setting method according to FIG. 9 (method of transmitting a UHF signal immediately before receiving the HF signal next to the HF signal reception). Although it is unlikely that the wireless IC tag can be controlled to transmit the tag UHF signal after the transmission of the HF signal is completed on the signal transmitter side, compared with the method of FIG. There is a high possibility that the wireless IC tag can be controlled to transmit the tag UHF signal after the transmission of the HF signal is completed. In particular, in the case of the portable HF transmitter 6, there is no performance until the two operations of the HF signal transmission and the tag UHF signal reception overlap in time, and the two operations are simultaneously processed in parallel. There is a good point.

However, the demerit of the transmission timing setting method of the tag UHF signal according to FIG. 10 is that it is somewhat more complicated than the simple operation-controlled wireless IC tag of FIG. 8 and the simple wireless IC tag of FIG. This is because it is necessary to provide a processing function for randomly setting the transmission timing of the UHF signal. Here, the file IC tag 41 and the archive IC tag 31 using the tag UHF signal transmission timing setting method shown in FIG. 10 have relatively simple operation control so that manufacturing and control settings can be made inexpensively. It is desirable. Therefore, in the transmission timing setting method of the tag UHF signal according to FIG. 10, the random time interval “random” <γ (= 1 sec) between transmission of the first UHF signal and reception of the next HF signal is set. Originally, the file IC tag 41 and the archive IC tag 31 have a function of repeatedly transmitting UHF signals at random time intervals in the second and subsequent UHF signal transmissions. Even when the first UHF signal is transmitted, the same processing as the random time interval (4 sec <ε _t αγ <8 sec) may be performed. That is, “random” = ε _t αγ (≠ γ) may be set.

FIG. 11 is a diagram illustrating a fifth example of the transmission timing of the tag UHF signal according to the first embodiment.
The transmission timing of the tag UHF signal described in FIG. 11 is after the file IC tag 41 or the archive IC tag 31 receives the HF signal, and the transmission of the HF signal on the transmitter side that transmits the HF signal. An example in which the UHF signal is transmitted after the transmission is completed is shown.
As in the previous FIGS. 7 to 10, in FIG. 11 as well, the arrow on the left side from the center of the figure indicates the time zone when the library 3 closed the door, and the library 3 opened the door with the arrow on the right side from the center. Indicates the time zone. Similarly to FIGS. 7 to 10, in the process of FIG. 11, in the process of receiving the tag HF signal by the file IC tag 41 or the archive IC tag 31, the tag HF signal reception is β [sec] (= 1 msec. ), And the tag HF signal reception interval is repeated at γ [sec] (= 1 sec). Further, the library HF signal or the portable HF signal is transmitted with a weak wireless and a time width of αγ [sec] (= 1.2 sec, 1 <α <2). The operation of each device of the file management system described with reference to FIG. 11 is the same as that shown in FIGS. After that, the file IC tag 41 and the archive IC tag 31 transmit the tag UHF signal. The difference between FIGS. 7 to 10 and FIG. 11 is that the file IC tag 41 and the archive IC tag. The tag UHF signal transmission processing at 31 is performed after transmission of the HF signal on the transmitter side that transmits the HF signal is completed.

Here, the wireless IC tags such as the file IC tag 41 and the library IC tag 31 grasp the timing of completion of the HF signal transmission processing on the transmitter side (for example, the portable HF signal transmitter 6) that transmits the HF signal. In order to do this, it is necessary that the HF signal stores the ID of the HF transmitter (for example, the portable HF signal transmitter 6) and further includes timing information. As this timing information, since the ID of the transmitter is transmitted many times within the transmission time width of the HF signal, it may be detected by counter information indicating how many times this ID is transmitted. This counter information is read from the HF signal received by the wireless IC tag such as the file IC tag 41 or the archive IC tag 31, and the timing at which the transmission of the HF signal is completed can be known. As a specific example, the library HF transmitter 32 or the portable HF transmitter 6 repeats ID transmission 1800 times during a time width of 1.2 sec in one HF signal transmission. Then, the counter λ ₁₁ is stored in the transmission of one ID, and the value of λ ₁₁ is updated by one each time the ID is transmitted. The count information at the very beginning of this HF signal transmission process is “1”, and the count information at the last ID transmission in the same HF signal transmission is “1800” (λ _max ). For example, if the wireless IC tag receives an HF signal in which counter information “600” is stored, as shown in FIG.
τ ₁₁ = αγ (1-λ ₁₁ / λ _max ) = 1.2 sec × (1-600 / 1800) = 0.8 sec
And it can be estimated that HF signal transmission is completed after τ ₁₁ = 0.8 sec.

The merit of the method for setting the transmission timing of the tag UHF signal according to FIG. 11 is that, after the HF signal transmission processing of the HF transmitter is completed, that is, after the time τ ₁₁ until the HF signal transmission processing is completed, The wireless IC tag can transmit a tag UHF signal. In any of the methods for setting the transmission timing of the tag UHF signal shown in FIG. 7 to FIG. 10, the processing of transmitting the tag UHF signal of the wireless IC tag may occur before the HF signal transmission of the HF transmitter is completed. There is. Therefore, particularly in the case of the portable HF transmitter 6, the two operations of the HF signal transmission process and the UHF signal reception process from the wireless IC tag in the portable HF transmitter 6 should be reliably separated in time. Therefore, the portable HF transmitter 6 does not have to have a high performance for simultaneously processing these two operations.

However, the disadvantage of the method for setting the transmission timing of the tag UHF signal according to FIG. 11 is that the UHF signal is transmitted after a lapse of random time as shown in FIG. 10, even if a plurality of wireless IC tags receive the HF signal at the same time. The transmission timing of the UHF signal can be shifted, and thereby the collision of the UHF signal can be avoided, but the UHF signal from the wireless IC tag is similar to or more than the method described with reference to FIGS. Collisions can occur. That is, in the method for setting the transmission timing of the tag UHF signal described with reference to FIG. 11, if a plurality of wireless IC tags receive the same HF signal continuously transmitted at αγ (= 1.2 sec) even if not simultaneously, The wireless IC tag in FIG. 1 matches the transmission of the tag UHF signal with the completion of the HF signal transmission processing in the HF transmitter. Therefore, these UHF signals are likely to collide. For this reason, it seems that it is impossible to identify the files 4 stored in the archive 3, but even in the operation of transmitting the tag UHF signal according to FIG. 11, as described with reference to FIGS. Even when the tag UHF signal cannot be read due to collision, the tag UHF signal transmission processing is performed at a random time interval ε _t αγ (the function ε _t that changes randomly here is set to 3 <ε _t <7). So that signal collisions in the subsequent tag UHF signal transmission process are avoided.

  So far, a plurality of examples of the transmission timing of the tag UHF signal, that is, the timing at which the tag UHF signal is first transmitted from the reception of the HF signal from the HF transmitter has been described. Further, in the transmission of the tag UHF signal, when the reception of the archive HF signal is triggered, the transmission of the tag UHF signal is repeatedly performed. Next, how long the transmission of the UHF signal by the wireless IC tag is continued will be described.

FIG. 12 is a diagram showing an outline of the UHF signal transmission timeout determination process.
Next, with reference to FIG. 12, in the repetition of the UHF signal transmission processing after receiving the HF signal of the wireless IC tag (file IC tag 41 or archive IC tag 31), how to determine the timeout of the UHF signal is determined. Explain how.
FIG. 12 shows time-series processes related to tag HF signal reception processing, tag UHF signal transmission processing, and archive HF signal transmission processing. Moreover, in FIG. 12, the time zone when the door of the library 3 was opened is shown by the center arrow, and the time zone when the door of the library 3 was closed is shown by the left and right arrows. First, a time zone indicated by an arrow on the left side of FIG. 12 is a time zone in which the door of the library 3 is closed. In this state, there is no processing of tag UHF signal transmission and archive HF signal transmission, and only processing of tag HF signal reception is time interval β [sec] (= at regular intervals of γ [sec] (= 1 sec). 1 msec).

  Next, when the user opens the door of the library 3, the state shifts to a state in which the door of the library 3 indicated by the center arrow is opened. In this time zone, the open / close switch 33 or the illuminance sensor 326 connected to the archive HF transmitter 32 attached to the door of the archive 3 detects the situation where the door of the archive 3 is opened. Then, the library HF transmitter 32 transmits a library HF signal with a weak radio and a time width of αγ [sec] (= 1.2 sec), and transmission of this library HF signal is 60 sec (= ωαγ [sec] = 50 × 1.2 sec). When the wireless IC tag (file IC tag 41 or archive IC tag 31) receives this HF signal by the tag HF signal reception process repeated at the preceding 1 sec interval, the wireless IC tag performs the process of tag UHF signal transmission. Do.

The transmission of the tag UHF signal by the wireless IC tag is performed by any one of several methods described above with reference to FIGS. Thereafter, the tag UHF signal transmission is performed at random intervals of 4 to 8 seconds (the time interval is determined by setting the randomly changing function ε _t as 3 <ε _t <7 and calculating ε _t αγ [sec]). Send repeatedly. When the door of the library 3 is kept open as it is, the HF signal is repeatedly transmitted at 60 sec intervals from the library HF transmitter 32 described above. The transmission of the HF signal is received by the wireless IC tag by the process of receiving the HF signal, and the transmission of the repeated HF signal is continued. Then, when the door of the library 3 of FIG. 12 is closed by the user, the door of the library 3 indicated by the arrow on the right side of FIG. At this time, the open / close switch 33 mounted on the archive HF transmitter 32 detects a situation in which the door of the archive 3 is closed. Then, the library HF transmitter 32 stops the repeated transmission of the HF signal. As a result, the HF signal in the wireless IC tag is not received. In such a situation, the wireless IC tag continues to repeat the transmission of the tag UHF signal until the timeout, triggered by the last received archive HF signal in the tag HF signal reception process. The transmission of the tag UHF signal is performed at random intervals of 4 to 8 seconds (the time interval is determined by setting the randomly changing function ε _t as 3 <ε _t <7 and calculating ε _t αγ [sec]). Although being repeated, the transmission of the UHF signal is stopped after a certain time 120 sec (= 100 × 1.2 = ζωαγ [sec]) from the transmission of the first tag UHF signal in the repeated transmission. That is, after the time corresponding to ζ (= 2) times has elapsed with respect to ωαγ = 60 sec of the archive HF signal repetition interval, the repetition processing of the tag UHF signal transmission in the wireless IC tag is stopped. As a result, only the process of receiving the tag HF signal is repeated at intervals of 1 msec (= β [sec]), and the process returns to the time zone in which the door of the library 3 is closed at the left arrow in FIG.

FIG. 13 is a diagram showing an outline of processing of the file management system.
Next, the flow of processing between devices will be described with reference to FIG.
In FIG. 13, for convenience of explanation, only the number of devices necessary for explanation of the operation of the file management system is shown, but actually, the number of archive HF transmitters 32 and the number of archive IC tags of the archive 3 are shown. There are 31 IC tags 41 for the number of files stored in the library 3, and the number of UHF transceivers 2 required for key points such as the size of the room in the library room, the corridor and the entrance of the building. It shall be installed. Then, referring to FIG. 13, description will be made in order from the left side in accordance with the signal flow including bidirectional signals for these devices.
First, from FIG. 13, the archive HF transmitter 32 and the portable HF transmitter 6 transmit HF signals to the file IC tag 41 and the archive IC tag 31. When the archive HF transmitter 32 and the portable HF transmitter 6 transmit the HF signal, the archive HF transmitter 32 is in the state of the door being opened by the open / close switch 33 or the illuminance sensor 326 attached to the door of the archive 3. In the portable HF transmitter 6, it is an operation of the operation input unit 632 by the user .

  Next, the file IC tag 41 that has received the HF signal transmitted from the library HF transmitter 32 or the portable HF transmitter 6 and the library IC tag 31 attached to the library door transmit the UHF signal (or If it has already been transmitted, the process of stopping the transmission) is started. Note that the archive IC tag 31 having a slightly different functional configuration from the file IC tag 41 is connected to an open / close switch 33 and an illuminance sensor 316 attached to the door of the archive 3, and attached to these doors. The UHF signal is also transmitted when the open state of the door is detected by a signal from the open / close switch 33 or the illuminance sensor 316. The UHF signal transmitted from the file IC tag 41 or the archive IC tag 31 is received by the UHF transceiver 2 and the portable HF transmitter 6. Here, the file IC tag 41 and the library IC tag 31 have a function of receiving a UHF signal (UHF transmission / reception antennas 3111 and 4111 and UHF transmission / reception units 3113 and 4113), and the UHF transceiver 2 and the portable HF transmission. The machine 6 has a function of transmitting a UHF signal. Therefore, UHF signals can be exchanged bidirectionally between the wireless IC tag of the file IC tag 41 or the library IC tag 31 and the UHF transmitter / receiver 2 or the portable HF transmitter 6. The LED mounted on the wireless IC tag of the file IC tag or the library IC tag is turned on or the lighted LED is turned off by the UHF signal transmitted from the UHF transceiver 2 or the portable HF transmitter 6. Can do.

  The UHF transceiver 2 is connected to the file management apparatus 1 via a communication network. In response to an instruction from the file management apparatus 1, the UHF transceiver 2 can control the turning on and off of the LED mounted on the wireless IC tag. Further, the UHF transceiver 2 transfers information in the UHF signal received from the file IC tag 41 or the archive IC tag 31 to the file management apparatus 1. On the other hand, the portable HF transmitter 6 includes an operation input unit 632 (operation button) and a monitor display unit 631, and the monitor display unit 631 displays a screen for operating turning on / off of the LED of the wireless IC tag described above. indicate. And the input information for operating lighting / extinction of LED of these radio | wireless IC tags based on a user's operation is received. The portable HF transmitter 6 can also update the information stored in the portable HF transmitter 6 with the information stored in the UHF signal transmitted from the file IC tag 41 or the archive IC tag 31. In addition, the portable HF transmitter 6 has a function of communication with the radio base station apparatus 5, and can exchange information with the file management apparatus 1 via a communication network connected to the radio base station apparatus 5. It can be done. Here, in FIG. 13, for convenience of explanation, the portable HF transmitter 6 is shown in two places on the left side and the center of the flow, but these portable HF transmitters 6 are assumed to be the same.

FIG. 14 is a diagram illustrating an example of each device installed in the library and a signal transmitted by the device.
As shown in FIG. 14, each of the archives 3A, 3B, and 3C has one archive HF transmitter 32 and one archive IC tag 31, and each file 4 stored in each archive has a file An IC tag 41 is attached. That is, in the archive 3A, the archive HF transmitter 32A and the archive IC tag 31A are attached one by one, and in addition to this, the file IC tags 41-1a, 41-2a,. It is attached to each of the files 1a to Na stored in the archive 3A. Similarly, a library HF transmitter 32B and a library IC tag 31B are attached to the library 3B one by one. In addition, file IC tags 41-1b, 41-2b,. Attached to each of the files 1b to Nb stored in the archive 3B. Further, the library 3C is provided with one library HF transmitter 32C and one library IC tag 31C. In addition, the file IC tags 41-1c, 41-2c,... 41-Nc are stored in the library 3C. Are attached to each of the files 1c to Nc stored in the. The UHF signal is transmitted from each IC tag 31A to 31C attached to the library 3A to 3C and each file IC tag 41 attached to the file 4 stored in the library 3A to 3C, and the UHF transceiver 2 Is transmitted to the file management apparatus 1 via.

FIG. 15 shows a device ID table stored in the file management apparatus.
The file management apparatus 1 manages the device IDs of the devices attached to each library and the file IC tag 41 attached to the file stored in each library. In FIG. 15, the ID number of each device is displayed in hexadecimal, the ID of the archive HF transmitter 32 is 5 digits (20 bits), and the ID of the wireless IC tag such as the archive IC tag 31 or the file IC tag 41. Is 6 digits (24 bits). The device ID table shown in FIG. 15 is stored in the file management apparatus 1.

  Then, the file management apparatus 1 receives a signal from the UHF transceiver 2 by the operation of each device. Here, it is assumed that the file management apparatus 1 receives the information shown in the UHF transceiver reception information tables (1) to (3) shown in FIGS. 16 to 18 from the UHF transceiver 2. Based on the received information, the file management apparatus 1 automatically creates the device ID table shown in FIG.

FIG. 16 shows a UHF transceiver reception information table (1).
FIG. 17 shows a UHF transceiver reception information table (2).
FIG. 18 shows a UHF transceiver reception information table (3).
Here, the UHF transceiver reception information table (1) in FIG. 16 is transmitted to the UHF transceiver 2 from the wireless IC tag (the archive IC tag 31A or the file IC tag 41-1a to Na) attached to the archive 3A. In addition, the file management apparatus 1 has received the UHF transceiver 2. Also, the UHF transceiver reception information table (2) in FIG. 17 is transmitted to the UHF transceiver 2 from the wireless IC tag (the archive IC tag 31B or the file IC tags 41-1b to Nb) attached to the archive 3B. In addition, the file management apparatus 1 has received the UHF transceiver 2. Further, the UHF transceiver reception information table (3) in FIG. 18 is transmitted to the UHF transceiver 2 from the wireless IC tag (the archive IC tag 31C or the file IC tags 41-1c to Nc) attached to the archive 3C. In addition, the file management apparatus 1 has received the UHF transceiver 2.
Of the information in the UHF transceiver reception information table shown in FIGS. 16 to 18, the file management apparatus 1 stores which file IC tag 41 is attached in which archive based on the information of the ID portion. Is calculated.

Next, how information for creating the device ID table (FIG. 15) is transmitted from the wireless IC tag and what kind of creation processing is performed in the file management apparatus 1 will be described.
First, the file management apparatus 1 assigns one ID “000A00” received by the UHF transceiver 2 from the received information in the column (1) in the UHF transceiver reception information table (1) of FIG. 16 to the UHF transceiver. 2 that the data is received via the communication network. Here, the file management apparatus 1 stores this ID in association with the information of the archive 3A. As a result, the file management apparatus 1 detects that “000A00” is the ID of the archive IC tag 31A attached to the archive 3A. Further, it can be detected that only one ID is stored in the signal, but the situation where only one ID is stored and the UHF signal is transmitted is that the library IC tag 31 is operated by the open / close switch 33 or the library 3A. This is a case where the open state of the door is detected on the basis of a signal from the illuminance sensor 316 attached to, and a UHF signal is transmitted. Therefore, the file management apparatus 1 reads one ID of “000A00” received by the UHF transceiver 2 from the column (1) of the UHF transceiver reception information table, and the ID is the open / close switch 33 according to the information. Alternatively, when the library IC tag 31A detects the open state of the door based on a signal from the illuminance sensor 316 attached to the library 3A, it can be estimated that its own ID is transmitted by the UHF signal. As a result, the file management apparatus 1 stores the information of the archive 3A, the ID “000A00” of the archive IC tag 31A, and the arbitrary device name of the archive IC tag 31A that transmitted the ID in the apparatus ID table of FIG. Store in association with each other.

  The file management apparatus 1 receives the two IDs “0A000” and “000A00” registered in the column (2) after receiving the ID in the column (1) of the UHF transceiver reception information table (1). Are received and their IDs are read. Here, since the same ID as the ID read from the column (1) of the UHF transceiver reception information table is stored in these two IDs, the file management apparatus 1 is based on the ID “000A00”. , It is detected as described above that the ID is the ID of the archive IC tag 31A attached to the archive 3A. Further, the file management apparatus 1 reads the second ID “0A000”. Since this ID is transmitted from the IC tag 31A for the archive together with the ID “000A00” of the IC tag 31A for the archive, it can be seen that this ID is the ID of the HF transmitter. Since “0A000” is stored as the ID of the archive HF transmitter 32A, the ID is detected as the ID of the archive HF transmitter 32A. Then, in the device ID table of FIG. 15, the file management apparatus 1 displays the information of the library A, the information of the ID “0A000” of the detected library HF transmitter 32A, and the device name of the library HF transmitter 32A. Record in association. It should be noted that the situation in which the UHF signal storing the ID of the archive IC tag 31A and the ID of the archive HF transmitter 32A is transmitted is indicated by a signal from the illumination sensor 316 attached to the open / close switch 33 or the archive 3A. Based on the reception of the archive HF signal, the archive HF transmitter 32A transmits the archive HF signal. Based on the reception of the archive HF signal, the archive IC tag 31A stores the ID of the archive HF transmitter 32A and its own ID. This is a case of transmitting a signal.

  Further, the file management apparatus 1 uses the IDs “0A000,00085C”, “0A000,000B39”,..., “0A000,000426” shown in the columns (3) to (5) of the UHF transceiver reception information table (1). The UHF signal storing each set of "is sequentially received. The set of two IDs stored in these sequentially received UHF signals always stores the ID “0A000” of the archive HF transmitter 32A determined by the above-described processing. The ID is different from the ID “000A00” of the IC tag for archive 31A determined in the above and is stored in the UHF signal. Therefore, the file management apparatus 1 determines that the tag is transmitted from a tag other than the archive IC tag 31A attached to the archive 3A, that is, the file IC tag 41. As a result, of the IDs “0A000,00085C”, “0A000,000B39”,..., “0A000,000426” in the columns (3) to (5), It can be determined that IDs that are not the ID of the archive HF transmitter 32A are the IDs of the file IC tags 41 stored in the archive 3A. Then, in the device ID table of FIG. 15, the file management apparatus 1 stores the information of the library A, the IDs of the file IC tags 41 of the file IC tags 41-1a to 41-Na, and the file indicated by the ID. An arbitrary device name of the IC tags 41-1a to 41-Na is recorded in association with each other.

  It should be noted that if the archive information (archive identification information) is stored in association with the ID of the archive HF transmitter 32 by the processing in the file management apparatus 1 described above, the file IC tag 41 is obtained from the received ID. Can be recorded in the device ID table so that it can be seen in which archive. That file 4 corresponding to the IC tag 41 respectively for file, even without first registering or are accommodated in advance in which archive the file management apparatus 1, it is possible to manage the storage location.

  Similarly to the above-described processing, the file management apparatus 1 uses the UHF transceiver 2 for the archive HF transmitter 32B, the archive IC tag 31B, and the file IC tags 41-1b to 41-41 attached to the archive 3B. In addition, the UHF signal is received from the archive HF transmitter 32C, the archive IC tag 31C, and the file IC tags 41-1c to 41-Nc attached to the archive 3C (FIGS. 17 and 18). Then, the file management apparatus 1 generates a device ID table in which each device name installed in the library B and the library C is associated with its ID by the same processing as described above (FIG. 15). The UHF signal reception order (1) to (5), (6) to (10), and (11) to (16) in the UHF transceiver reception information tables (1) to (3) are for convenience of explanation. The order of reception is not necessary for creating the device ID table. That is, even if the reception information of the UHF transceiver reception information table as shown in FIGS. 16 to 18 is mixed, the device ID table can be created by the same processing as described above.

FIG. 19 is a diagram showing an outline of processing when a user borrows a file.
Next, an example in which a certain user borrows a file and then returns and stores the file in a different library in the storage state of the file in each library shown in FIG. 14 will be described with reference to FIG.
From FIG. 19, it is assumed that the user first borrows the file 4 that is stored in the library 3B and has the file IC tag 41-2b (ID; 000690) attached thereto. Then, the number of files stored in the archive 3B is N-1. Thus, the UHF signal (signal (9) in FIG. 17 ) is not transmitted from the file IC tag 41-2b until the door of the library 3B is closed. Information related to the library 3B received by the UHF transceiver 2 at this time is shown in the UHF transceiver reception information table (4) in FIG. In FIG. 20, compared with the reception information of the UHF signal in the UHF transceiver reception information table (2) of FIG. 17, the UHF signal is received from the file IC tag 41-2b in the column (9) by borrowing the file. Indicates that it will disappear.

  Consider a case where the user returns and stores the borrowed file not in the original archive 3B but in the archive 3A. In this case, the file 4 to which the file IC tag 41 with ID “000690” is attached is returned and stored in the archive 3A. For convenience, the device name in the library A with the ID “000690” is the file IC tag 41-N + 1a. Until the door of the archive 3A is closed, the UHF signal (ID 000690) of the file IC tag 41-N + 1a that has received the HF signal and the ID “0A000” of the archive HF transmitter 32A are stored ( 16) is transmitted from the file IC tag 41-N + 1a, and the information stored in the signal is transmitted to the file management apparatus 1 via the UHF transceiver 2. Then, information related to the archive 3A received by the UHF transceiver 2 is shown in the UHF transceiver reception information table (5) of FIG.

  And since there is no change in the reception status of the UHF signal in the UHF transceiver 2 for the information related to the archive 3C, the reception information of the file management device 1 related to the archive 3C is the UHF transceiver reception information table shown in FIG. (3) Therefore, the file management apparatus 1 uses the received information in the UHF transceiver reception information tables (4), (5), and (3) to borrow the user's file and return it to the archive 3A different from the original archive 3B. The device ID table after the change due to storage is generated, recorded and stored in a database or the like.

FIG. 22 shows the device ID table after the change.
As shown in this figure, in the device ID table after the change, information of the file for the IC tag ID = 0 00.69 thousand to as information relating to the archive 3B was originally recorded as a file for an IC tag 41- 2b is removed As the information related to the archive 3A, in addition to the conventional information, information on the file IC tag 41-N + 1a and the file IC tag with the device name ID = 0 00690 attached for convenience is added.

  As described above, the file management apparatus 1 determines which file IC to which archive 3 based on the ID information of each device from the archive IC tag 31 or the file IC tag 41 received via the UHF transceiver 2. It is possible to track and manage whether the file 4 to which the tag 41 is attached exists. This eliminates the need for the administrator to create a database of the file 4 stored in the archive 3 in advance, to browse and borrow the user's file, and to update the data for each return one by one. Labor can be reduced.

FIG. 23 is a flowchart of the device ID table generation process.
With reference to FIG. 23, general operations regarding generation processing such as registration and update of the device ID table will be described in order.
In the processing described above, the file management apparatus 1 first determines whether or not a transfer of information has been received from the UHF transceiver 2 that has received the UHF signal within a certain time (step S101). If the transfer of the UHF signal information has not been received, the process ends. If the transfer of the UHF signal information has been received, the UHF signal information is received by the processing unit (step S102). All the stored IDs are read (step S103). Then, the file management apparatus 1 determines whether or not the ID of the archive HF transmitter 32 exists in the ID (step S104). If the ID of the archive HF transmitter 32 does not exist, the file management apparatus 1 can determine that the ID is the ID of the archive IC tag (the archive IC tag 31 is determined from the archive HF transmitter 32). Before receiving the HF signal, it detects the open state of the door and transmits a UHF signal storing only its own ID), and determines whether this ID is already registered in the device ID table (step) S105). That is, if the door is opened for the first time, the ID of the library HF transmitter 32 is not registered, but if the door is opened for the second time or later, the ID of the library HF transmitter 32 is already registered. Therefore, the presence or absence of the registration is determined. If the ID is already registered in the archive HF transmitter 32, the process proceeds to step S101 as it is and waits for reception of the next UHF signal information. If the ID of the library IC tag 31 is not registered in step S105, the ID of the library IC tag 31 is stored in advance in association with the ID (library identification information; library A , Library B, library C, etc.) are registered in the device ID table (step S106).

  In step S104, if the ID of the archive HF transmitter 32 is present in the received UHF signal, another ID should be stored. It is determined whether it is registered in the device ID table (step S107). Here, the ID stored in the UHF signal together with the ID of the archive HF transmitter 32 is either the ID of the archive IC tag 31 or the ID of the file IC tag 41. Therefore, if the ID is registered in the device ID table in the determination in step S107, the ID of the archive HF transmitter 32 obtained from the UHF signal and the ID (archive IC tag 31 stored together with the ID) are stored. Alternatively, it is determined whether the combination of any ID of the file IC tag 41 is already registered in the device ID table (step S108). If the combination of the ID of the archive HF transmitter 32 acquired from the UHF signal and the ID stored together with the ID has already been registered (Yes), it is determined that the ID is not changed, and the process directly proceeds to step S101. If the combination of the ID of the archive HF transmitter 32 obtained from the UHF signal and the ID stored together with the ID is not registered (No), the ID is stored in the UHF signal together with the ID of the archive HF transmitter 32. The determined ID is determined to be the ID of the file IC tag 41 (step S109). Then, the ID of the file IC tag 41 is associated with the information of the library 3 other than the information of the library 3 that can be specified based on the ID of the library HF transmitter 32 stored in the UHF signal together with the ID. It is determined whether it is registered (step S110). That is, it is determined whether it is the file IC tag 41 of the file 4 originally stored in another archive. If the answer is No in step S110, the ID of the archive IC tag stored in the UHF signal and the ID of the archive HF transmitter 32 stored in the UHF signal together with the ID can be specified. The library information and the device name of the file IC tag 41 are associated with each other and newly registered in the device ID table (step S111). If Yes in step S110, the ID of the file IC tag 41 is deleted from the record in the device ID table (step S112), that is, the record registered as a file in another archive is deleted. The ID of the file IC tag 41, the information on the archive that can be specified based on the ID of the archive HF transmitter 32 stored in the UHF signal together with the ID, and the device name of the file IC tag 41 are associated with each other. Then, it is updated and registered in the device ID table (step S113).

  If the ID stored in the UHF signal together with the ID of the library HF transmitter 32 is not registered in the device ID table in the determination in step S107, the ID of the library HF transmitter 32 and the library IC are stored. Since the UHF signal storing the ID of the tag 31 should have been received first, an ID that is not registered in the device ID table is identified as the ID of the file IC tag (step S114). Then, the ID of the archive IC tag stored in the UHF signal, the archive information that can be specified based on the ID of the archive HF transmitter 32 stored in the UHF signal together with the ID, and the file IC tag 41 Are newly registered in the device ID table in association with the device name (step S115).

  As described above, information indicating which file 4 is stored in which archive 3 is held and updated by the file management apparatus 1. When searching for a file 4 to be browsed by the user based on this information, the file management device 1 instructs the library HF transmitter 32 to transmit the HF signal via the communication network. The wireless IC tag (the archive IC tag 31 and the file IC tag 41) that has received the HF signal is activated. Further, the file management apparatus 1 turns on an LED mounted on the IC tag 31 for the archive via the UHF transceiver 2 to indicate which archive 4 contains the file 4 to be viewed, and further The LED of the file IC tag attached to 4 can also be turned on to indicate the corresponding file 4 itself.

  For example, in the file management apparatus 1, a list corresponding to each file 4 in the device ID table as shown in FIG. 15 and the library 3 in which the file 4 is stored is created and held. Assume that the user selects, for example, the file IC tag 41-1a from the device ID table of FIG. Then, by the processing of the file management apparatus 1, a transmission request for the HF signal is transmitted to the archive HF transmitter 32 of the archive 3A via the communication network, and the wireless IC tag is activated. Thereafter, under the control of the file management apparatus 1, the UHF signal storing the information of “000A00” that is the ID number of the archive IC tag 31A is transmitted from the UHF transceiver 2 and the archive IC tag 31A that has received this UHF signal. However, it detects its own ID number “000A00” from the received UHF signal and mounts it to light the LED. Further, after a while, the archive IC tag 31A detects that the user has opened the door of the archive 3A, and transmits a UHF signal. Then, the file management apparatus 1 receives information from the archive HF transmitter 32A that has received the UHF signal, and detects that the door of the archive 3A has been opened. When the user inputs an instruction to turn on the LED of the file IC tag 41-1a to the file management apparatus, the file management apparatus 1 stores the UHF in which “00085C” that is the ID of the file IC tag 41-1a is stored. Instructs the UHF transceiver 2 to transmit a signal. Then, the file IC tag 41-1a receives the UHF signal in which the ID “00085C” is stored, detects that the ID is its own ID, and turns on the LED mounted on itself.

  As described above, the file management system according to the present embodiment has been described. According to the above-described processing, the active wireless IC tag is used as the archive IC tag 31 or the file IC tag 41. There is no need to make the user hold the card, or when storing the file 4 with the file IC tag 41 pasted, it is not necessary to pay attention to the storage direction of the file 4, and the shelf for storing the specified size It is not necessary to pay attention to the position. In particular, even after the file 4 is taken out from the archive 3, the file IC tag 41 attached to the file 4 transmits the UHF signal, and the UHF transceiver 2 receives this signal. I can grasp. For example, if a UHF transceiver 2 is installed in a library room with a library, a corridor outside it, or a building entrance / exit, it is possible to notify an administrator or security officer of an unauthorized take-out alarm based on the UHF reception history at that location. It becomes possible. Further, when compared with the technology related to the cabinet of Non-Patent Document 1 in which a passive wireless IC tag is attached to the file 4 and a large reader is installed for each shelf, the file management system according to the present embodiment has each file. Since the UHF transmitter / receiver 2 receives radio waves transmitted from the active type wireless IC tag attached to the device, the power for driving the file management system (mainly the HF transmitter 32 for archive and the UHF transmitter / receiver 2) is used. It can be greatly reduced.

  Further, the archive IC tag 31 transmits a UHF signal in which both the ID in the HF signal transmitted from the archive HF transmitter 32 and the ID of the archive IC tag 31 are stored, so this UHF signal is transmitted. By doing so, it is possible to reliably grasp which file 4 is stored in which archive 3. That is, it is not necessary to create a list of the storage status of the file 4 by another method. Furthermore, since the UHF signal is transmitted from the library IC tag 31 responding to the HF signal from the portable HF transmitter 6 by the user holding the portable HF transmitter 6 and approaching the library 3, the UHF signal Can be received by the portable HF transmitter 6, it can be determined whether or not the file 4 desired by the user exists near the user.

(Second Embodiment)
Next, a file management system according to the second embodiment will be described.
The file management system according to the second embodiment has the same device configuration as the file management system according to the first embodiment. The functional blocks of each device are the same as the functional blocks shown in FIGS. Further, the signal transmission / reception relationship between the devices in the file management system according to the second embodiment is the same as the signal transmission / reception relationship between the devices of the file management system according to the first embodiment shown in FIG. Furthermore, the processing flow of FIG. 14 to FIG. 23 described in the first embodiment and the processing related to generation and update of the device ID table are the same processing in the second embodiment. However, the difference between the file management systems of the second embodiment and the first embodiment is that in the processing of the second embodiment, the HF transmitter transmits an HF signal with the door of the library 3 closed. However, when the door of the library 3 is opened, the transmission of the HF signal by the HF transmitter and the transmission of the UHF signal by the wireless IC tag are stopped. That is, the transmission timing of the HF signal and the UHF signal is set while the door of the library 3 is open in the second embodiment, while the door of the library 3 is closed in the second embodiment. The first embodiment and the second embodiment are the same for other processes and functions.

FIG. 24 is a diagram showing an outline of processing in the file management system according to the second embodiment.
In FIG. 24, the outlines of the tag HF signal reception process at the first stage, the tag UHF signal transmission process at the second stage, and the archive HF signal transmission process at the third stage are shown in time series. Further, in this figure, an arrow in the center of the figure indicates a time zone when the library 3 opens the door, and two arrows on the left and right of the center arrow indicate a time zone in which the library 3 is closed.
First, in the state in which the library 3 indicated by the left arrow is closed, the library HF transmitter 32 attached to the library 3 is connected to the library 3 by the open / close switch 33 or the illuminance sensor 326 mounted on the device. A signal indicating the closed state of the door is received, and the closed state of the library is detected based on the signal. For example, in the case of the illuminance sensor 326, the closed state is detected if an illuminance value lower than the threshold value is received as a signal. In the case of the opening / closing switch 33, it is determined whether the switch is open or closed when the door is in the closed state, thereby detecting the closed state of the door. Based on the detection of the closed state, the library HF transmitter 32 repeats at a weak radio, with a time width of αγ [sec] (= 1.2 sec) and an interval of 60 sec (= 50 × 1.2 sec = ωαγ). A library HF signal is transmitted.

  In the transmission of the library HF signal having a time width of 1.2 sec, the ID of the library HF transmitter 32 is repeatedly transmitted repeatedly. Then, in the transmission of the archive HF signal having a time width of 1.2 sec, transmission of the ID of the archive HF transmitter 32 is repeated 1800 times. When the wireless IC tag such as the library IC tag 31 or the file IC tag 41 receives the transmission of the HF signal by the process of receiving the tag HF signal repeated at intervals of 1 sec, the tag UHF signal is transmitted. This tag UHF signal is shown as a rectangular wave in the second stage time series of FIG. The transmission of the tag UHF signal is performed by any one of several methods described later. In a situation where the archive door remains closed, the archive HF transmitter 32 repeats the transmission of the HF signal at intervals of 60 sec. Each time the archive IC tag 31 or the file IC tag 41 receives the HF signal, it transmits the UHF signal.

  Next, it is assumed that the time is shifted to the time indicated by the arrow in the center of FIG. 24 and the door of the library 3 is opened. When the door transitions from the closed state to the open state, the library HF transmitter 32 switches from the closed state to the open state based on a signal received from the open / close switch 33 or the illuminance sensor 316 mounted on the apparatus. The transition is detected, and the transmission of the library HF signal repeated at intervals of 60 sec (= 50 × 1.2 sec = ωαγ) is stopped. When the transmission of the archive HF signal is stopped in this way, the wireless IC tags such as the archive IC tag 31 and the file IC tag 41 do not receive the archive HF signal. As a result, in the wireless IC tag, the tag HF signal reception process is simply repeated at regular intervals for each of the time widths β [sec] (= 1 msec) and γ [sec] (= 1 sec).

  Further, it is assumed that the door moves to the time zone indicated by the arrow on the right side of FIG. 24 and the door of the library 3 is closed. Even when the door shifts from the open state to the closed state, the library HF transmitter 32 shifts from the open state to the closed state based on a signal received from the open / close switch 33 or the illuminance sensor 316 mounted on the device. As a result, the library HF transmitter 32 starts the transmission process of the HF signal repeatedly. Then, in the wireless IC tag that has received this HF signal, transmission of the UHF signal is started when the tag HF signal is received. The transmission process of the tag UHF signal is continuously performed with the reception of the HF signal repeatedly transmitted at intervals of 60 sec (= 50 × 1.2 sec = ωαγ). As a result, it returns to the closed state of the left arrow in FIG.

  As described above, at the transmission / reception timing of each signal described with reference to FIG. 24, in response to detecting that the door of the library 3 is closed, the library HF transmitter 32 repeatedly transmits the HF signal, The example in which the wireless IC tag transmits the UHF signal based on the reception of the HF signal has been described, but at what timing the wireless IC tag transmits the UHF signal when the archive HF signal is received Several examples are described in detail below.

FIG. 25 is a diagram illustrating a first example of the transmission timing of the tag UHF signal according to the second embodiment.
FIG. 25 shows an example in which the wireless IC tag transmits the UHF signal after a certain time after receiving the HF signal from the archive HF transmitter 32 as a first example of the UHF signal transmission timing in the second embodiment. Yes. The tag UHF signal transmission timing setting method according to the second embodiment shown in FIG. 25 is the same as the tag UHF signal transmission timing setting method according to the first embodiment shown in FIG. 7, and the wireless IC tag receives the HF signal. The processing procedure for transmitting the UHF signal after that is the same. In FIG. 25, the arrow on the left side from the center of the figure indicates the time zone when the library 3 closed the door, and the arrow on the right side indicates the time zone when the library 3 opened the door. In the example of FIG. 25, the transmission timing of the tag UHF signal is set after a certain time after the archive HF signal is received by the tag HF signal reception processing in the wireless IC tag, and the UHF signal is transmitted (tag UHF). A signal rectangle extending upward in the time series of signal transmission). This fixed time (described as “fixed” in FIG. 25) is shorter than the repetition interval of receiving the tag HF signal (that is, fixed <γ = 1 sec), for example, set to 0.25 sec. When the portable HF signal is received by the portable HF transmitter 6 in the process of receiving the tag HF signal, the wireless IC tag transmits the tag UHF signal after a predetermined time from receiving the portable HF signal (tag UHF signal). A signal rectangle extending downward in the time series of transmission). The method shown in FIG. 25 is a typical example in which the transmission timing of the tag UHF signal is performed after a certain time from the reception of the HF signal, but there are several other examples of setting the transmission timing of the UHF signal. Another example of the transmission timing of the UHF signal will be described below.

FIG. 26 is a diagram illustrating a second example of the transmission timing of the tag UHF signal according to the second embodiment.
In FIG. 26, similarly to FIG. 25, the arrow on the left side from the center of the figure indicates the time zone when the library 3 closed the door, and the arrow on the right side indicates the time zone when the library 3 opened the door. . Also in FIG. 26, the process of receiving the tag HF signal in the wireless IC tag is repeated at regular intervals for each of the time widths β [sec] (= 1 msec) and γ [sec] (= 1 sec). Further, when the door of the library 3 is closed, the library HF signal transmission processing or the portable HF signal transmission processing is performed with weak wireless and αγ [sec] (= 1.2 sec, 1 <α <2). Is done. Note that the processing of the library HF signal transmission is stopped in a state where the door of the library 3 is open, but the portable HF transmitter 6 is irrelevant to the open / closed state of the door of the library 3, and is based on the user's operation. It shall be possible to transmit a signal. This HF signal is received by the wireless IC tag by the process of receiving the HF signal. The operation of each device described above is the same in both the example of FIG. 25 and FIG. However, the difference from the operation of the device in FIG. 25 is that the wireless IC tag immediately transmits the UHF signal after receiving the HF signal from the HF transmitter. The tag UHF signal transmission timing setting method according to the second embodiment shown in FIG. 26 is the same as the tag UHF signal transmission timing setting method according to the first embodiment shown in FIG. 8, and the wireless IC tag receives the HF signal. The processing procedure for transmitting the UHF signal after that is the same.

  The advantage of the UHF signal transmission timing of FIG. 26 due to this difference is that it is not necessary to count the interval until the transmission timing of the UHF signal, so that the processing in the wireless IC tag is simple operation control. The operation control of FIG. 26, that is, the process of transmitting the UHF signal immediately after the reception of the HF signal from the HF transmitter is simpler than the process of transmitting the UHF signal after a certain time from the reception of the HF signal shown in FIG. It is processing. Simpler operation control makes it possible to manufacture and control wireless IC tags at low cost, and is suitable for using a large number of IC tags 31 for archives and IC tags 41 for files. Conversely, a disadvantage of the UHF signal transmission timing in FIG. 26 is that the tag UHF transmission is most likely to be performed when the HF transmission is not completed. That is, in the case of the portable HF transmitter 6, the portable HF from the file IC tag 41 or the library IC tag 31 triggered by the HF signal transmission from the portable HF transmitter 6 and the reception of the HF signal transmission. The process of receiving the tag UHF signal in the transmitter 6 overlaps in time. Therefore, the performance of the portable HF transmitter 6 needs to be able to process these two operations simultaneously. Incidentally, in the method of FIG. 25, the file IC tag 41 and the library IC tag 31 transmit the UHF signal after a certain time (for example, fixed = 0.25 sec) after the reception of the HF signal transmitted from the portable HF transmitter 6. Therefore, the possibility that the file IC tag 41 and the archive IC tag 31 transmit the UHF signal at a timing slightly before the HF signal transmission from the portable HF transmitter 6 is completed is low.

  Another disadvantage of the transmission timing of the tag UHF signal in FIG. 26 is that when a large number of files 4 are stored in the same archive 3, if a plurality of tag UHF signal transmissions occur at the same time, the tag UHF signal Collide, and the UHF signal cannot be received in the device that receives the signal. That is, a large number of file IC tags 41 in the archive 3 receive a certain archive HF signal, and a plurality of tag UHF signals may be simultaneously transmitted at a certain ratio, so that signal collision occurs. This UHF signal collision also occurs in the method of FIG. The number of files stored in the same library 3 for avoiding the collision of the tag UHF signal is related to the ratio of the time width β [sec] of the tag HF signal reception and the repetition interval γ [sec]. That is, in FIG. 26, the tag HF signal reception time width is 1 msec and the tag HF signal reception repetition interval is 1 sec. Therefore, the ratio is 1000 times, and the number of files stored in the same library 3 is 200 to 200. If it is about 300, collision of a plurality of tag UHF signals can be largely avoided. This number of files is realistic as the number of files stored in one archive 3, and can also be used in the method shown in FIG.

FIG. 27 is a diagram illustrating a third example of the transmission timing of the tag UHF signal according to the second embodiment.
In FIG. 27, as in FIGS. 25 and 26, the left arrow from the center of the figure indicates the time zone when the library 3 closed the door, and the right arrow indicates the time zone when the library 3 opened the door. Show. Also in FIG. 27, the process of receiving the tag HF signal in the wireless IC tag is repeated at regular intervals for each of the time widths β [sec] (= 1 msec) and γ [sec] (= 1 sec). Further, when the door of the library 3 is closed, the library HF signal transmission processing or the portable HF signal transmission processing is performed with weak wireless and αγ [sec] (= 1.2 sec, 1 <α <2). Is done. Note that the processing of the library HF signal transmission is stopped in a state where the door of the library 3 is open, but the portable HF transmitter 6 is irrelevant to the open / closed state of the door of the library 3, and is based on the user's operation. It shall be possible to transmit a signal. This HF signal is received by the process of receiving the HF signal of the wireless IC tag. The operation of each device described above is the same as that in FIG. However, the difference between the UHF signal transmission timing in FIG. 25 and FIG. 26 and FIG. 27 is that the tag UHF signal transmission processing in the file IC tag 41 or the archive IC tag 31 is the library HF signal transmission or the portable HF signal transmission. After the reception of the HF signal, the transmission timing of the tag UHF signal is set immediately before the timing of performing the next HF signal reception process. The tag UHF signal transmission timing setting method according to the second embodiment shown in FIG. 27 is the same as the tag UHF signal transmission timing setting method according to the first embodiment shown in FIG. 9, and the wireless IC tag receives the HF signal. The processing procedure for transmitting the UHF signal after that is the same.

  The merit of the method for setting the tag UHF signal transmission timing according to FIG. 27 is that after the HF signal transmission from the portable HF transmitter 6 or the like is completed, the file IC tag 41 or the library IC tag 31 outputs the tag UHF signal. The possibility of sending is high. In particular, in the case of the portable HF transmitter 6, there is a low possibility that two operations for receiving the HF signal transmission and the tag UHF signal transmission overlap in time. Therefore, as a performance of the portable HF transmitter 6, there is a point that these two operations may not be processed simultaneously in parallel. Incidentally, the tag UHF signal transmission timing setting method (method for transmitting a UHF signal immediately after reception of the HF signal) shown in FIG. 26 is performed while the wireless IC tag transmits UHF signals while the portable HF transmitter 6 transmits HF signals. The method of setting the tag UHF signal transmission timing (method of transmitting the UHF signal after a lapse of a certain time from the reception of the HF signal) shown in FIG. 25 is also used by the portable HF transmitter 6 to transmit the HF signal. There is a low possibility that the wireless IC tag transmits the UHF signal during transmission. However, in the setting method of the tag UHF signal transmission timing shown in FIG. 27, the wireless IC tag is transmitted while the portable HF transmitter 6 is transmitting the HF signal more than the processing of the setting method of the tag UHF signal transmission timing shown in FIG. Is less likely to transmit a UHF signal.

  Note that a disadvantage of the tag UHF signal transmission timing setting method shown in FIG. 27 is that the operation control of the wireless IC tag is slightly complicated. The method for setting the tag UHF signal transmission timing shown in FIG. 26 (method for transmitting the UHF signal immediately after receiving the HF signal) is a simple operation control, and the method for setting the tag UHF signal transmission timing shown in FIG. The operation control is also somewhat simple in a system in which a UHF signal is transmitted after a certain time (for example, fixed = 0.25 sec) has elapsed since signal reception. However, the tag UHF signal transmission timing setting method shown in FIG. 27 cannot be said to be simple in operation control as compared with FIGS. That is, in the file management system of the present application, since many wireless IC tags are used, it is necessary to be able to construct the manufacturing / control settings of the wireless IC tags at a low cost. However, when the tag UHF signal transmission timing setting method shown in FIG. 27, which requires non-simple operation control, is used, it is difficult to reduce the manufacturing / control setting of the wireless IC tag.

  Further, the demerit of the tag UHF signal transmission timing setting method described in FIG. 27 is similar to the tag UHF signal transmission timing setting method (method of transmitting tag UHF signal immediately after receiving the HF signal) in FIG. When a large number of files 4 are stored in the same library 3, there is a high possibility that the signals collide due to the transmission of a plurality of tag UHF signals at the same time and the signals cannot be read on the receiving side. However, if the file 3 of about 200 to 300 is stored in the archive 3, the tag HF signal reception time width is 1 msec, and the tag HF signal reception repetition interval is 1 sec. The ratio is 1000 times, and it is possible to largely avoid collision of a plurality of tag UHF signals. This number of files is realistic as the number of files stored in one archive 3, and can also be used in the method shown in FIG.

FIG. 28 is a diagram illustrating a fourth example of the transmission timing of the tag UHF signal according to the second embodiment.
In FIG. 28, as in FIGS. 25 to 27, the left side from the center of the figure indicates the time zone when the library 3 closed the door, and the right side arrow indicates the time zone when the library 3 opened the door. Show. Also in FIG. 28, the process of receiving the tag HF signal in the wireless IC tag is repeated at regular intervals for each of the time widths β [sec] (= 1 msec) and γ [sec] (= 1 sec). Further, when the door of the library 3 is closed, the library HF signal transmission processing or the portable HF signal transmission processing is performed with weak wireless and αγ [sec] (= 1.2 sec, 1 <α <2). Is done. Note that the processing of the library HF signal transmission is stopped in a state where the door of the library 3 is open, but the portable HF transmitter 6 is irrelevant to the open / closed state of the door of the library 3, and is based on the user's operation. A signal shall be transmitted.
This HF signal is received by the process of receiving the HF signal of the wireless IC tag. The operation of each device described above is the same as in the examples of FIGS. However, the difference between the UHF signal transmission timings in FIGS. 25 to 27 and FIG. 28 is that the processing of tag UHF signal transmission in the file IC tag 41 or the archive IC tag 31 is the library HF signal transmission or the portable HF signal transmission. This is a point that is performed after a lapse of a random time after receiving the HF signal. The tag UHF signal transmission timing setting method according to the second embodiment shown in FIG. 28 is the same as the tag UHF signal transmission timing setting method according to the first embodiment shown in FIG. 10, and the wireless IC tag receives the HF signal. The processing procedure for transmitting the UHF signal after that is the same.

  The advantage of the method for setting the tag UHF signal transmission timing according to FIG. 28 is that a larger number of files 4 can be accommodated in the archive 3. That is, in the method of setting the tag UHF signal transmission timing according to FIGS. 25 to 27, when a large number of files 4 are stored in the archive 3, the plurality of file IC tags 41 and the archive IC tags 31 receive the HF signal. Later, UHF signals are transmitted at the same time, and these signals collide with each other, making it difficult to read the signals on the receiving side of the signals. That is, in the method for setting the tag UHF signal transmission timing according to FIGS. Here, in order to practically avoid the collision of the tag UHF signal transmission, the number of files that can be stored in the same library is the tag HF signal reception time width β [sec] (= 1 msec) and the transmission of the signal. This is related to the ratio of the repetition interval γ [sec] (= 1 sec). In any of the cases of FIGS. 25 to 27, the ratio is 1000 times, and the archive 3 that stores about 200 to 300 files can sufficiently avoid the collision in the transmission of the tag UHF signal. And in the system for setting the tag UHF signal transmission timing according to FIG. 21, the collision in the transmission of the tag UHF signal can be avoided more than the system of FIGS. That is, in the case where there are a plurality of wireless IC tags that receive the same HF signal at exactly the same timing, the transmission of the tag UHF signal necessarily occurs at the same timing and collides with any of the systems shown in FIGS. However, in the method of setting the tag UHF signal transmission timing shown in FIG. 28, even if the reception of the HF signal in a plurality of wireless IC tags is the same timing, the UHF signal is transmitted after a lapse of random time. The collision of UHF signals of the wireless IC tags can be avoided.

  Another advantage of the tag UHF signal transmission timing setting method according to FIG. 28 is that the tag UHF signal is highly likely to be transmitted when transmission of the HF signal is completed. That is, by using the tag UHF signal transmission timing setting method according to FIG. 28, two operations, in particular, transmission of the HF signal in the portable HF transmitter 6 and reception of the UHF signal of the wireless IC tag based on reception of the HF signal. Are less likely to overlap in time. Therefore, there is an advantage that the high performance for simultaneously processing these two operations at the same time is not required as the performance required for the portable HF transmitter 6. Incidentally, the tag UHF signal transmission timing setting method (method for transmitting a UHF signal immediately after receiving the next HF signal after receiving the HF signal) shown in FIG. 27 is highly likely to be performed by the portable HF transmitter 6. When the transmission of the HF signal is completed, the wireless IC tag transmits the tag UHF signal. 26 is a method for setting the tag UHF signal transmission timing (method for transmitting a UHF signal immediately after reception of the HF signal), and the wireless IC tag transmits the UHF signal at the transmission timing of the HF signal in the portable HF transmitter 6. The possibility of sending is high. The tag UHF signal transmission timing setting method (method in which the wireless IC tag transmits a UHF signal after a certain time (for example, fixed = 0.25 sec) from the reception of the HF signal) shown in FIG. 25 includes the portable HF transmitter 6 It is considered that the possibility that the wireless IC tag transmits the UHF signal at the timing of transmitting the HF signal is low to some extent. However, in contrast to these systems, the tag UHF signal transmission timing setting system shown in FIG. 28 (a system in which a UHF signal is transmitted after a lapse of a random time after receiving the HF signal) is used at the transmission timing of the HF signal. The possibility of transmitting UHF signals is suppressed to a fairly low level.

  On the other hand, a disadvantage of the tag UHF signal transmission timing setting method shown in FIG. 28 is that the wireless IC tag requires complicated operation control. Even in the tag UHF signal transmission timing setting method shown in FIG. 27, the operation control of the wireless IC tag is slightly complicated. Note that the tag UHF signal transmission timing setting method shown in FIG. 26 is simple operation control. Also, the operation control of the tag UHF signal transmission timing setting method shown in FIG. 25 is somewhat simple. However, the tag UHF signal transmission timing setting method shown in FIG. 28 is more complicated in operation control than the tag UHF signal transmission timing setting methods shown in FIGS. The wireless IC tags (archive IC tag 31 and file IC tag 41) required for the file management system in the present embodiment are used by attaching to a large number of files. Therefore, it is necessary to make the manufacturing and control settings of the wireless IC tag simple and inexpensive. However, the tag UHF signal transmission timing setting method shown in FIG. Is difficult.

FIG. 29 is a diagram illustrating a fifth example of the transmission timing of the tag UHF signal according to the second embodiment.
In FIG. 29, as in FIGS. 25 to 28, the left side from the center of the figure shows the time zone when the library 3 closed the door, and the right side arrow shows the time zone when the library 3 opened the door. Show. Also in FIG. 29, the process of receiving the tag HF signal in the wireless IC tag is repeated at regular intervals for each of the time widths β [sec] (= 1 msec) and γ [sec] (= 1 sec). Further, when the door of the library 3 is closed, the library HF signal transmission processing or the portable HF signal transmission processing is performed with weak wireless and αγ [sec] (= 1.2 sec, 1 <α <2). Is done. Note that the processing of the library HF signal transmission is stopped in a state where the door of the library 3 is open, but the portable HF transmitter 6 is irrelevant to the open / closed state of the door of the library 3, and is based on the user's operation. A signal shall be transmitted. This HF signal is received by the process of receiving the HF signal of the wireless IC tag. The operation of each device described above is the same as in the examples of FIGS. However, the difference between the UHF signal transmission timing in FIGS. 25 to 28 and FIG. 29 is that the tag UHF signal transmission processing in the file IC tag 41 or the archive IC tag 31 is performed on the transmitter side that transmits the HF signal. This is a point that is performed after the transmission of the HF signal is completely completed. The tag UHF signal transmission timing setting method according to the second embodiment shown in FIG. 29 is the same as the tag UHF signal transmission timing setting method according to the first embodiment shown in FIG. 11, and the wireless IC tag receives the HF signal. The processing procedure for transmitting the UHF signal after that is the same.

  Here, as the details of the merit by the transmission timing setting method of the tag UHF signal according to the second embodiment shown in FIG. 29, the process of transmitting the HF signal and the HF signal are received particularly in the portable HF transmitter 6. The two operations of receiving the tag UHF signal from the wireless IC tag are separated in terms of time, and the performance required for the portable HF transmitter 6 at the same time requires a high performance to simultaneously process these two operations. It is not done. In the other tag UHF signal transmission timing setting methods described so far, first, the tag UHF signal transmission timing setting method shown in FIG. 25 (the UHF signal after a certain time (for example, fixed = 0.25 sec) from the reception of the HF signal). The method of transmitting the UHF signal is somewhat low at the transmission timing of the HF signal. In addition, in the tag UHF signal transmission timing setting method (method in which the UHF signal is transmitted immediately after reception of the HF signal) shown in FIG. 26, there is a possibility that the wireless IC tag transmits the UHF signal at the transmission timing of the HF signal. high. In addition, the tag UHF signal transmission timing setting method shown in FIG. 27 (method of transmitting a UHF signal after receiving an HF signal and immediately before receiving the next HF signal) completes the transmission of the HF signal with high possibility. At that time, the tag UHF signal is transmitted from the wireless IC tag that has received the HF signal. In addition, in the tag UHF signal transmission timing setting method shown in FIG. 28, the radio IC tag that has received the HF signal transmits the UHF signal after the HF signal is received after a lapse of a random time. When the transmission of the HF signal is completed on the side, there is a high possibility that the wireless IC tag transmits the tag UHF signal UHF. The tag UHF signal transmission timing setting method (method of transmitting a UHF signal after a lapse of a random time after receiving the HF signal) shown in FIG. 28 has a possibility of transmitting the UHF signal at the timing of transmission of the HF signal. Remarkably low. Regardless of the method, the tag UHF signal transmission timing setting method in FIGS. 25 to 28 described so far has the possibility that the wireless IC tag transmits the UHF signal at the timing of transmission of the HF signal on the HF transmitter side. There are not a few.

In contrast to these methods, the tag UHF signal transmission timing setting method shown in FIG. 29 is first performed at the time of HF signal transmission processing with a time width of αγ [sec] (an HF transmitter 32 for library, portable HF transmission). In addition to the ID of the machine 6) being repeatedly included, for example, the ID is transmitted with a count value λ indicating how many times the ID is repeated. When the wireless IC tag receives this HF signal, the wireless IC tag can know the completion timing of the HF signal from the counter value. As a specific example, the library HF transmitter 32 or the portable HF transmitter 6 repeats ID transmission 1800 times during a time width of 1.2 sec in one HF signal transmission. Then, the counter λ ₂₉ is stored in the transmission of one ID, and λ ₂₉ is updated by one each time the ID is transmitted. The count information at the very beginning of this HF signal transmission process is “1”, and the count information at the last ID transmission in the same HF signal transmission is “1800” (λ _max ). For example, if the wireless IC tag receives the HF signal in which the counter information “280” is stored, as shown in FIG.
τ ₂₉ = αγ (1-λ ₂₉ / λ _max ) = 1.2 sec × (1-780 / 1800) = 0.68 sec
It can be determined that HF signal transmission is completed after 0.68 sec. Then, after the calculation time τ ₂₉ (= 0.68 sec), the wireless IC tag transmits a UHF signal. By doing so, the UHF signal is transmitted in the wireless IC tag after the transmission of the HF signal on the HF transmitter side is completed. Therefore, there is no need for the portable HF transmitter 6 to have high performance to operate the transmission of the HF signal and the reception of the tag UHF signal in parallel.

  On the other hand, the disadvantage of the tag UHF signal transmission timing setting method shown in FIG. 29 is that collision of the tag UHF signal transmitted from the wireless IC tag is more likely to occur. That is, in the tag UHF signal transmission timing setting method of FIGS. 25 to 28 described so far, when a large number of files 4 are stored in a certain archive 3, a plurality of tag UHF signals collide at the same timing, and UHF It becomes difficult for the transceiver 2 and the portable HF transmitter 6 to read the UHF signal. Regarding the collision of UHF signals, any tag UHF signal transmission timing setting method shown in FIGS. 25 to 27 occurs probabilistically according to the number of stored files in the library 3. However, the number of files that can actually avoid the collision of the tag UHF signal and can be stored in the same library is the reception time width β [sec] (= 1 msec) of the tag HF signal and the repetition interval γ of the transmission of the HF signal. It is related to the ratio of [sec] (= 1 sec). In the case of FIGS. 25 to 27, the ratio is 1000 times, and in the archive 3 that stores about 200 to 300 files 4, collision of the tag UHF signal can be sufficiently avoided.

  In addition to these, the method of FIG. 28 can avoid the collision of the tag UHF signal from FIGS. When a plurality of wireless IC tags receive a certain HF signal at exactly the same timing, the transmission of the tag UHF signal necessarily occurs at the same timing in FIGS. 25 to 27, but in FIG. Since the UHF signal is transmitted after a lapse of time, collision of UHF signals by a plurality of wireless IC tags can be avoided. That is, in the tag UHF signal transmission timing setting method of FIG. 28, a large number of files can be accommodated in the archive 3. However, in the tag UHF signal transmission timing setting method of FIG. 29, even if a plurality of wireless IC tags receive a single transmission of an HF signal at different timings, the timing at which the wireless IC tag transmits the UHF signal is When the HF signal transmission process is completed, the file IC tag attached to the file stored in the library 3 is increased more than the case of FIGS. Becomes difficult to read.

Another disadvantage of the tag UHF signal transmission timing setting method shown in FIG. 29 is that it is difficult to suppress the manufacturing price because the wireless IC tag performs more complicated operation control. The tag UHF signal transmission timing setting method (method of transmitting a tag UHF signal after a lapse of a random time after receiving the HF signal) shown in FIG. 28 is an HF before the transmission of the UHF signal in the operation control of the wireless IC tag. It is necessary to measure a random time lapse from the reception of the signal, and the processing is complicated in this respect. In addition, even in the tag UHF signal transmission timing setting method shown in FIG. 27 (a method in which a tag UHF signal is transmitted immediately after reception of the next HF signal after reception of the HF signal), the operation control of the wireless IC tag is slightly performed. It was complicated. Also, the tag UHF signal transmission timing setting method (method of transmitting a tag UHF signal immediately after receiving the HF signal) shown in FIG. 26 is simple operation control. The operation control of the tag UHF signal transmission timing setting method (method of transmitting a UHF signal after a certain interval from the reception of the HF signal) shown in FIG. 25 is somewhat simple. However, the tag UHF signal transmission timing setting method shown in FIG. 29 is more complicated in operation control than the tag UHF signal transmission timing setting method shown in FIGS. That is, the reason is based on the number of times λ (<λ _max ) that the ID of the HF transmitter is repeatedly transmitted in one transmission of the HF signal, for example, in order to know the time for completing the transmission of the HF signal in the HF transmitter. Thus, it is necessary to obtain the elapsed time τ for completing the transmission processing of the HF signal. As a wireless IC tag required for this file management system, the library IC tag 31 and the file IC tag 41, particularly the file IC tag 41 attached to a large number of files, can be easily and inexpensively manufactured and controlled. However, it is difficult to reduce the cost of the transmission timing setting method for the UHF signal having such complicated operation control.

  The file management system according to the second embodiment has been described above. According to this, as in the first embodiment, the active wireless IC tag is used, and the wireless IC tag reader is used. There is no need to pay attention when storing the file 4 with the action of holding the ID card or the IC tag. Further, compared with a passive wireless IC tag system, the power for driving the system is significantly less. In addition, since the ID transmitted from the archive HF transmitter 32 by the HF signal and the ID of the IC tag 31 itself are stored and transmitted in the UHF signal, which file 4 is stored in which archive. I can grasp it. Further, when the user who has the portable HF transmitter 6 approaches, the portable HF transmitter 6 can receive the UHF signal of the library IC tag 31 that responds to the HF signal, so that there is a desired file near the user. Can be provided.

  Further, as another effect of the second embodiment, unlike the first embodiment, the HF signal is transmitted from the library HF transmitter 32 with the door of the library 3 closed, and the file IC tag is used. The transmission of the HF signal is stopped when the UHF signal is transmitted and the door of the library is closed. Therefore, if radio waves are blocked by the door or wall of the archive, an effect of preventing the tag outside the archive 3 from being activated unnecessarily can be obtained. In addition, when the door of the library 3 is closed, a periodic HF signal of 60 sec intervals is transmitted from the library HF transmitter 32, and the UHF signal is transmitted to the file IC tag 41 or the library IC tag 31. ing. Through this series of operations, it is possible to continuously know which file exists in which archive. The reason why the library HF transmitter 32 and the library IC tag 31 are installed and operated inside the library 3 is that the UHF signal is a signal that can penetrate the door, unlike the electric field strength of the weak radio HF signal. Therefore, even when the door in the library 3 is closed, it is possible to receive and read the UHF transmission from the file IC tag 41 by the UHF transceiver 2 without any problem.

  The file management system described above is a file management system having at least a library wireless transmission device attached to a library, a file wireless transmission device attached to a file stored in the library, and a file management device. . In each of the above-described embodiments, the function is divided into the library HF transmitter 32 and the library IC tag 31 as the library wireless transmission device. Further, the file IC tag 41 is used as the file wireless transmission device. Then, the library wireless transmission device, based on the opening or closing of the library door, the activation request signal storing the identification information of the library in the file wireless transmission device (in the embodiment, from the library HF transmitter 32). HF signal). Also, the file wireless transmission device, upon receipt of the activation request signal, stores an activation signal (in the embodiment, a file IC tag in which the identification information of the archive included in the activation request signal and the identification information of the own device are stored). UHF signal from 41) is transmitted to the file management apparatus. When the file management device receives the activation signal, the file management device detects the identification information of the archive stored in the activation signal and the identification information of the wireless transmission device for the file, and the identification information of the archive and the wireless transmission device for the file A file management table (in the above embodiment, a device ID table) in which the identification information is stored in association with each other is generated.

  The file management apparatus 1 described above has a computer system inside. Each process described above is stored in a computer-readable recording medium in the form of a program, and the above process is performed by the computer reading and executing the program. Here, the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program.

  The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

It is a block diagram which shows the structure of a file management system. It is a functional block diagram of a file IC tag. It is a functional block diagram of an IC tag for library. It is a functional block diagram of the HF transmitter for library. It is a functional block diagram of a portable HF transmitter. It is a functional block diagram of a UHF transceiver. It is a figure which shows the process outline | summary of the file management system in 1st Embodiment. It is a figure which shows the 2nd example of the transmission timing of the tag UHF signal by 1st Embodiment. It is a figure which shows the 3rd example of the transmission timing of the tag UHF signal by 1st Embodiment. It is a figure which shows the 4th example of the transmission timing of the tag UHF signal by 1st Embodiment. It is a figure which shows the 5th example of the transmission timing of the tag UHF signal by 1st Embodiment. It is a figure which shows the outline | summary of the determination process of the transmission timeout of a UHF signal. It is a figure which shows the outline | summary of a process of a file management system. It is a figure which shows the example of the signal which each apparatus installed in the library and the apparatus transmits. It is a figure which shows the apparatus ID table which a file management apparatus memorize | stores. It is a figure which shows a UHF transmitter / receiver reception information table (1). It is a figure which shows a UHF transmitter / receiver reception information table (2). It is a figure which shows a UHF transmitter / receiver reception information table (3). It is a figure which shows the process outline | summary at the time of the file borrowing by a user. It is a figure which shows a UHF transmitter / receiver reception information table (4). It is a figure which shows a UHF transmitter / receiver reception information table (5). It is a figure which shows the apparatus ID table after a change. It is a figure which shows the flowchart of an apparatus ID table production | generation process. It is a figure which shows the process outline | summary in the file management system in 2nd Embodiment. It is a figure which shows the 1st example of the transmission timing of the tag UHF signal by 2nd Embodiment. It is a figure which shows the 2nd example of the transmission timing of the tag UHF signal by 2nd Embodiment. It is a figure which shows the 3rd example of the transmission timing of the tag UHF signal by 2nd Embodiment. It is a figure which shows the 4th example of the transmission timing of the tag UHF signal by 2nd Embodiment. It is a figure which shows the 5th example of the transmission timing of the tag UHF signal by 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... File management apparatus 2 ... UHF transmitter / receiver 3 ... Library 4 ... File 5 ... Wireless base station apparatus 6 ... Portable HF transmitter 31 ... IC tag for library 32. ..HF transmitter 33 for archives ... Open / close switch 41 ... IC tag for file

Claims (12)

A file management system having at least a library wireless transmission device attached to a library, a file wireless transmission device attached to a file stored in the library, and a file management device,
The library wireless transmission device is:
Based on the opening or closing of the door of the archive, it comprises an activation request signal transmission means for transmitting an activation request signal storing the identification information of the archive to the wireless transmission device for files,
The file wireless transmission device is:
Upon receipt of the activation request signal, the apparatus includes an activation signal transmission means for transmitting an activation signal storing the identification information of the archive included in the activation request signal and the identification information of the own device to the file management device,
The file management device includes:
An activation signal receiving means for receiving the activation signal;
Identification information detecting means for detecting identification information of the archive stored in the activation signal and identification information of the wireless transmission device for files;
File management table generating means for generating a file management table in which the identification information of the archive and the identification information of the wireless transmission device for files are stored in association with each other;
A file management system comprising: The file management table generating means of the file management device comprises:
A combination of the identification information of the archive already recorded in the file management table and the identification information of the wireless transmission device for file, the identification information of the archive stored in the newly received activation signal, and the file When the combination with the identification information of the wireless transmission device is compared, and the combination does not match, the combination of the identification information of the archive already recorded in the file management table and the identification information of the wireless transmission device for the file Information is deleted, and a combination of the identification information of the archive stored in the newly received activation signal and the identification information of the wireless transmission device for file is associated and recorded in the file management table. The file management system according to claim 1, wherein: The file wireless transmission device is:
Reception processing means for receiving and processing the activation request signal with a β time length and a γ time period (β <γ);
After the first transmission of the activation signal after receiving the activation request signal, activation signal transmission control means for controlling transmission of the activation signal for the second and subsequent times in a random cycle;
The archive radio transmission device includes an activation request signal transmission control means for periodically transmitting the activation request signal with an αγ (1 <α <2) time length;
The file management system according to claim 1 or 2, further comprising: The library wireless transmission device is configured to detect the opening or closing of the door of the library, a signal value indicating opening or closing from the opening / closing switch that detects the opening or closing, or an illuminance detection device that detects the illuminance of the library. Open / close detection means for detecting based on any one of illuminance values;
The file management system according to any one of claims 1 to 3, further comprising: 5. The activation signal transmission control means of the file wireless transmission device transmits the first activation signal after a predetermined time has elapsed since the reception of the activation request signal. The file management system described in any one. The activation signal transmission control means of the file wireless transmission device transmits the first activation signal immediately after receiving the activation request signal. File management system described in. The activation signal transmission control means of the file radio transmission device receives the first activation signal after the activation request signal reception process triggered by the activation signal transmission start process. The file management system according to claim 3, wherein the file management system is performed immediately before processing. 4. The activation signal transmission control means of the file wireless transmission device performs the first activation signal transmission after a lapse of random time after receiving the activation request signal. 5. The file management system according to any one of 4. The activation signal transmission control means of the file radio transmission device transmits the first activation signal in the archive radio transmission device of the activation request signal triggered by the transmission signal transmission start processing. 5. The file management system according to claim 3, wherein the file management system is performed after transmission is completed. A file management method in a file management system having at least a library wireless transmission device attached to a library, a file wireless transmission device attached to a file stored in the library, and a file management device,
The archive wireless transmission device transmits an activation request signal storing identification information of the archive to the file wireless transmission device based on the opening or closing of the library door,
Upon receipt of the activation request signal, the file wireless transmission device transmits an activation signal storing the identification information of the library and the identification information of the device itself to the file management device. And
The file management apparatus receives the activation signal, detects the identification information of the archive stored in the activation signal, and the identification information of the wireless transmission device for files, and identifies the identification information of the archive and the A file management method for generating a file management table in which identification information of a file wireless transmission device is stored in association with each other. The file management device includes:
A combination of the identification information of the archive already recorded in the file management table and the identification information of the wireless transmission device for file, the identification information of the archive stored in the newly received activation signal, and the file When the combination with the identification information of the wireless transmission device is compared, and the combination does not match, the combination of the identification information of the archive already recorded in the file management table and the identification information of the wireless transmission device for the file Information is deleted, and a combination of the identification information of the archive stored in the newly received activation signal and the identification information of the wireless transmission device for file is associated and recorded in the file management table. The file management method according to claim 10, wherein: The wireless transmission device for file receives the activation request signal in a β time length and a γ time period (β <γ), and after the first transmission of the activation signal after receiving the activation request signal, The transmission of the activation signal after the second time is controlled at a random cycle,
The file management method according to claim 10 or 11, wherein the archive radio transmission device periodically transmits the activation request signal with a time length of αγ (1 <α <2).

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