JP6093239B2 - Approach warning system - Google Patents
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Description
本発明は、フォークリフトやブルドーザなどの作業車両が作業する現場において、作業者が作業車両に接近したこと、クレーンなどの作業機械において作業者が所定距離内に入ったことなどを検知し、警告灯、警告音で知らせたり、ブレーキの制動などを行う作業者接近警報システム、あるいは、作業車両同士が一定距離以内に近づいたことを検知し、警告、ブレーキの制動などを行う作業車両（機器）接近警報システムに関するものである。 The present invention detects a worker approaching a work vehicle at a site where a work vehicle such as a forklift or a bulldozer works, and detects that a worker has entered a predetermined distance in a work machine such as a crane. , An approach warning system for workers approaching warning sounds, braking brakes, etc., or approaching work vehicles (equipment) for detecting warnings, braking brakes, etc. when work vehicles approach each other within a certain distance It relates to an alarm system.
なお、本発明において「機器」とは、作業車両やクレーンのように移動する機器のほか、移動しない機器を総称するものである。 In the present invention, “equipment” is a generic term for equipment that does not move, in addition to equipment that moves, such as work vehicles and cranes.
フォークリフトや重機などの移動する機器（以下、移動機器と称する。）に作業者が近づきすぎたことを検知する接近警報システムとして、特許文献１に開示されているように、誘導磁界（電磁誘導波）と電波を用いたものが知られている。具体的に特許文献１には、移動機器からの誘導磁界を作業者が携帯する子機が受信すると、その子機が電波を送信し、その電波を移動機器が受信すると警報を出力する接近警報システムが開示されている。 As an approach warning system for detecting that an operator has approached too much a moving device such as a forklift or heavy equipment (hereinafter referred to as a moving device), as disclosed in Patent Document 1, an induction magnetic field (electromagnetic induction wave) is disclosed. ) And radio waves are known. Specifically, Patent Document 1 discloses an approach alarm system in which when a slave unit carried by an operator receives an induction magnetic field from a mobile device, the slave unit transmits a radio wave and outputs a warning when the mobile device receives the radio wave. Is disclosed.
しかし、特許文献１の接近警報システムにおいて、誘導磁界の到達範囲は５ｍ程度であるのに対し、子機が送信する電波の到達範囲は２０〜１００ｍ程度と広いため、移動機器が複数台存在すると、子機が送信する電波が、警報を出力すべき移動機器以外の移動機器にまで到達し、関係のない移動機器においても警報（誤警報）が出力され、システムの信頼度が低下する。 However, in the approach warning system of Patent Document 1, the reach of the induction magnetic field is about 5 m, whereas the reach of the radio wave transmitted by the slave is as wide as about 20 to 100 m. The radio wave transmitted from the slave unit reaches a mobile device other than the mobile device to which an alarm is to be output, and an alarm (false alarm) is output even to an unrelated mobile device, thereby reducing the reliability of the system.
本発明が解決しようとする課題は、移動機器が複数台存在していたとしても、誤った接近警報が出力されることを防止できる接近警報システムを提供することにある。 The problem to be solved by the present invention is to provide an approach warning system that can prevent an erroneous approach warning from being output even if a plurality of mobile devices exist.
本発明の接近警報システムは、複数台の距離検知制御装置と少なくとも１個の磁界検知機能付きＲＦＩＤタグとの間の距離の接近を検知して接近警報を出力する接近警報システムであって、前記複数台の距離検知制御装置はそれぞれ、誘導磁界送信部と、電波受信部と、当該距離検知制御装置の固有ＩＤ電波を送信するＩＤ送信部と、前記接近警報を出力する警報出力部と、これらを制御する制御部とを備え、前記磁界検知機能付きＲＦＩＤタグは、前記誘導磁界送信部から送信される誘導磁界を検知する磁界センサ部と、当該磁界センサ部が前記誘導磁界を検知したときに磁界検知電波を送信する電波送信部とを備え、前記複数台の距離検知制御装置のうち一の距離検知制御装置の電波受信部が他の距離検知制御装置からの固有ＩＤ電波を受信すると、前記一の距離検知制御装置の制御部が、前記ＩＤ送信部からの固有ＩＤ電波及び前記誘導磁界送信部からの誘導磁界の送信を所定時間Ｔ延期すると共に、当該所定時間Ｔの間は前記電波受信部が前記磁界検知電波を受信したとしても接近警報は出力させず、前記所定時間Ｔを経過後に、前記ＩＤ送信部から固有ＩＤ電波及び前記誘導磁界送信部から誘導磁界を送信させると共に、前記電波受信部が前記磁界検知電波を受信したときに前記警報出力部から接近警報を出力させ、前記電波受信部が固有ＩＤ電波を受信した他の距離検知制御装置の台数をＮとすると、前記制御部は、前記所定時間ＴをＴ×Ｎに設定することを特徴とするものである。 An approach alarm system according to the present invention is an approach alarm system that detects the approach of a distance between a plurality of distance detection control devices and at least one RFID tag with a magnetic field detection function, and outputs an approach alarm. Each of the plurality of distance detection control devices includes an induction magnetic field transmission unit, a radio wave reception unit, an ID transmission unit that transmits a unique ID radio wave of the distance detection control device, an alarm output unit that outputs the approach warning, and The RFID tag with a magnetic field detection function includes a magnetic field sensor unit that detects an induction magnetic field transmitted from the induction magnetic field transmission unit, and when the magnetic field sensor unit detects the induction magnetic field. A radio wave transmission unit that transmits a magnetic field detection radio wave, and the radio wave reception unit of one distance detection control device among the plurality of distance detection control devices receives a unique ID radio wave from another distance detection control device. Then, the control unit of the one distance detection control device delays transmission of the unique ID radio wave from the ID transmission unit and the induction magnetic field from the induction magnetic field transmission unit for a predetermined time T, and during the predetermined time T Even if the radio wave receiving unit receives the magnetic field detection radio wave, an approach warning is not output, and after the predetermined time T has elapsed, a unique ID radio wave is transmitted from the ID transmitting unit and an induced magnetic field is transmitted from the induced magnetic field transmitting unit. In addition, when the radio wave reception unit receives the magnetic field detection radio wave, the alarm output unit outputs an approach alarm, and the number of other distance detection control devices that the radio wave reception unit has received the unique ID radio wave is N. The control unit sets the predetermined time T to T × N.
また本発明において、前記距離検知制御装置は機器に取り付け、前記磁界検知機能付きＲＦＩＤタグは作業者に取り付けることができる。あるいは、前記距離検知制御装置は第１の機器に取り付け、前記磁界検知機能付きＲＦＩＤタグは第２の機器（前記第１の機器とは別種類の機器）に取り付けることもできる。なお、前記の第１の機器及び第２の機器のうち少なくとも一方は移動機器である。 Moreover, in this invention, the said distance detection control apparatus can be attached to an apparatus, and the said RFID tag with a magnetic field detection function can be attached to an operator. Alternatively, the distance detection control device can be attached to a first device, and the RFID tag with a magnetic field detection function can be attached to a second device (a device different from the first device). Note that at least one of the first device and the second device is a mobile device.
本発明によれば、複数の距離検知制御装置のうち一の距離検知制御装置が他の距離検知制御装置からの固有ＩＤ電波を受信すると、当該一の距離検知制御装置からの固有ＩＤ電波及び誘導磁界の送信を所定時間延期する共に、当該所定時間Ｔの間は磁界検知電波を受信したとしても接近警報を出力しない。これにより、移動機器が複数台存在していたとしても、誤った接近警報が出力されることを防止でき、システムの信頼性を向上させることができる。 According to the present invention, when one distance detection control device among a plurality of distance detection control devices receives a unique ID radio wave from another distance detection control device, the unique ID radio wave and guidance from the one distance detection control device. While the transmission of the magnetic field is postponed for a predetermined time, even if the magnetic field detection radio wave is received during the predetermined time T, the approach warning is not output. As a result, even if there are a plurality of mobile devices, it is possible to prevent an erroneous approach warning from being output, and to improve the reliability of the system.
以下、図面に示す実施例に基づき、本発明の実施の形態を説明する。 Hereinafter, embodiments of the present invention will be described based on examples shown in the drawings.
図１は、本発明の一実施例による接近警報システムのブロック図である。本発明の接近警報システムは、複数台の距離検知制御装置１０と少なくとも１個の磁界検知機能付きＲＦＩＤタグ１１０からなる。 FIG. 1 is a block diagram of an approach warning system according to an embodiment of the present invention. The approach warning system of the present invention comprises a plurality of distance detection control devices 10 and at least one RFID tag 110 with a magnetic field detection function.
距離検知制御装置１０は、誘導磁界送信部１１と電波受信部１２とＩＤ送信部１３と警報出力部１４とこれらを制御する制御部１５を備え、磁界検知機能付きＲＦＩＤタグ２０は、磁界センサ部２１と電波送信部２２を備える。また、距離検知制御装置１０は、外部電源を距離検知制御装置１０の稼動に適した直流電圧（１２Ｖ）に変換する電圧変換部１６を備え、磁界検知機能付きＲＦＩＤタグ２０は、電源としてバッテリ２３を備える。 The distance detection control device 10 includes an induction magnetic field transmission unit 11, a radio wave reception unit 12, an ID transmission unit 13, an alarm output unit 14, and a control unit 15 that controls them. The RFID tag 20 with a magnetic field detection function includes a magnetic field sensor unit. 21 and a radio wave transmitter 22. In addition, the distance detection control device 10 includes a voltage conversion unit 16 that converts an external power source into a DC voltage (12 V) suitable for the operation of the distance detection control device 10, and the RFID tag 20 with a magnetic field detection function includes a battery 23 as a power source. Is provided.
まず、図１に示す接近警報システムの基本動作を説明すると、距離検知制御装置１０は、例えば移動機器であるフォークリフトの天板部分に取り付けられ、その誘導磁界送信部１１が長波帯周波数（例えば１２５ｋＨｚ）の誘導磁界を送信する。そして、例えば作業員のヘルメットに取り付けられた磁界検知機能付きＲＦＩＤタグ（以下、ＲＦＩＤタグとも称す。）２０の磁界センサ部２１が誘導磁界を検知すると、電波送信部２２が磁界検知電波（ＵＨＦ帯電波）を送信する。この磁界検知電波を距離検知制御装置１０側の電波受信部１２が受信すると、警報出力部１４が接近警報を出力する。これらの距離検知制御装置１０の各部の動作は全て制御部１４が制御する。なお、誘導磁界の到達範囲は５ｍ程度であり、磁界検知電波の到達範囲は２０〜１００ｍ程度である。 First, the basic operation of the approach warning system shown in FIG. 1 will be described. The distance detection control device 10 is attached to, for example, a top plate portion of a forklift that is a mobile device, and its induction magnetic field transmission unit 11 has a long-wave frequency (for example, 125 kHz). ) Induction magnetic field is transmitted. For example, when the magnetic field sensor unit 21 of an RFID tag with a magnetic field detection function (hereinafter also referred to as an RFID tag) 20 attached to a worker's helmet detects an induced magnetic field, the radio wave transmission unit 22 detects a magnetic field detection radio wave (UHF band). (Radio). When the radio wave receiving unit 12 on the distance detection control device 10 side receives this magnetic field detection radio wave, the alarm output unit 14 outputs an approach alarm. The operation of each part of these distance detection control devices 10 is controlled by the control unit 14. The reach of the induction magnetic field is about 5 m, and the reach of the magnetic field detection radio wave is about 20 to 100 m.
ここで、本発明の接近警報システムは、複数台の距離検知制御装置１０が存在することを前提としており、上述の基本動作のままでは、ＲＦＩＤタグ２０が一の距離検知制御装置１０の磁界検知範囲内（誘導磁界の到達範囲内）に入り、そのＲＦＩＤタグ２０が磁界検知電波を送信すると、その磁界検知電波が、当該一の距離検知制御装置１０だけでなく他の距離検知制御装置１０にまで到達し、関係のない距離検知制御装置１０においても警報（誤警報）が出力されることがある。そこで、本発明では、複数台の距離検知制御装置１０のそれぞれに、当該距離検知制御装置１０の固有ＩＤ電波を送信するＩＤ送信部１３を設け、一の距離検知制御装置１０からの固有ＩＤ電波を他の距離検知制御装置１０の電波受信部１１で受信し、上述のような誤警報が出力されることを防止するようにしている。そのための具体的な動作は、距離検知制御装置１０の制御部１５が各部の動作を制御することにより実行される。 Here, the approach warning system of the present invention is based on the premise that there are a plurality of distance detection control devices 10, and the magnetic field detection of the distance detection control device 10 with one RFID tag 20 is performed with the basic operation described above. When the RFID tag 20 transmits a magnetic field detection radio wave within the range (within the reach of the induction magnetic field), the magnetic field detection radio wave is transmitted not only to the one distance detection control device 10 but also to another distance detection control device 10. Even in the distance detection control device 10 that is irrelevant, an alarm (false alarm) may be output. Therefore, in the present invention, each of the plurality of distance detection control devices 10 is provided with an ID transmission unit 13 that transmits the unique ID radio wave of the distance detection control device 10, and the unique ID radio wave from one distance detection control device 10 is provided. Is received by the radio wave receiver 11 of the other distance detection control device 10 to prevent the false alarm as described above from being output. A specific operation for that purpose is executed by the control unit 15 of the distance detection control device 10 controlling the operation of each unit.
図２は、距離検知制御装置１０の制御部１５による制御フローの一実施例を示し、図３は、その制御による、２台の距離検知制御装置１０の動作フローを示す。ここで、本実施例において距離検知制御装置１０は所定の周期で間歇的に固有ＩＤ電波及び誘導磁界を送信するように構成されている。 FIG. 2 shows an example of a control flow by the control unit 15 of the distance detection control device 10, and FIG. 3 shows an operation flow of the two distance detection control devices 10 under the control. Here, in the present embodiment, the distance detection control device 10 is configured to intermittently transmit the unique ID radio wave and the induced magnetic field at a predetermined cycle.
図２を図１及び図３と共に参照しつつ説明すると、距離検知制御装置１０の電源がＯＮになると、制御部１５はその距離検知制御装置１０の周期タイマ及び警報許可タイマをスタートさせる。ここで、周期タイマは、上述した固有ＩＤ電波及び誘導磁界を送信する周期をカウントするためのタイマであり、周期タイマの初期値は８０ｍｓである。また、警報許可タイマは、その距離検知制御装置１０の電波受信部１２がＲＦＩＤタグ２０からの磁界検知電波を受信したときに、これに応答して警報出力部１４から接近警報を出力させることを許可する期間をカウントするためのタイマであり、警報許可タイマは８０ｍｓに設定（固定）されている。本実施例では、周期タイマの初期値と警報許可タイマの設定値を同一にしているが、警報許可タイマは、周期タイマの初期値以下の範囲で任意に設定することができる。 2 will be described with reference to FIGS. 1 and 3. When the power of the distance detection control device 10 is turned on, the control unit 15 starts the cycle timer and the alarm permission timer of the distance detection control device 10. Here, the period timer is a timer for counting the period for transmitting the above-described unique ID radio wave and induction magnetic field, and the initial value of the period timer is 80 ms. In addition, the alarm permission timer outputs an approach warning from the alarm output unit 14 in response to the reception of the magnetic field detection radio wave from the RFID tag 20 by the radio wave reception unit 12 of the distance detection control device 10. This is a timer for counting the permitted period, and the alarm permission timer is set (fixed) to 80 ms. In this embodiment, the initial value of the cycle timer and the set value of the alarm permission timer are made the same, but the alarm permission timer can be arbitrarily set within a range equal to or less than the initial value of the cycle timer.
周期タイマ及び警報許可タイマがスタートすると、制御部１５は「調整時間」が経過後、ＩＤ送信部１３から固有ＩＤ電波を送信させ、続いて誘導磁界送信部１１から誘導磁界を送信させる。次いで制御部１５は、電波受信部１２が電波（他の距離検知制御装置１０からの固有ＩＤ電波又はＲＦＩＤタグ２０からの磁界検知電波）を受信しているか否かをチェックする。 When the period timer and the alarm permission timer are started, the control unit 15 causes the ID transmission unit 13 to transmit the unique ID radio wave after the “adjustment time” has elapsed, and subsequently causes the induction magnetic field transmission unit 11 to transmit the induction magnetic field. Next, the control unit 15 checks whether or not the radio wave receiving unit 12 is receiving radio waves (unique ID radio waves from other distance detection control devices 10 or magnetic field detection radio waves from the RFID tag 20).
電波受信部１２が電波を受信していなければ、周期タイマが設定値になるまで電波受信部１２が電波を受信しているか否かのチェックを継続し、周期タイマが設定値になったら、次のサイクル（周期タイマ）をスタートする。 If the radio wave receiver 12 is not receiving radio waves, it continues to check whether or not the radio wave receiver 12 is receiving radio waves until the periodic timer reaches a set value. Cycle (period timer) is started.
電波受信部１２が電波を受信した場合、制御部１５はその電波が他の距離検知制御装置１０からの固有ＩＤ電波とＲＦＩＤタグ２０からの磁界検知電波のいずれであるかを判別する。その電波がＲＦＩＤタグ２０からの磁界検知電波である場合、制御部１５は警報許可タイマが設定値（８０ｍｓ）を超えているか否かを判断し、超えていなければ警報出力部１４に接近警報を出力させる。 When the radio wave receiving unit 12 receives the radio wave, the control unit 15 determines whether the radio wave is a unique ID radio wave from another distance detection control device 10 or a magnetic field detection radio wave from the RFID tag 20. When the radio wave is a magnetic field detection radio wave from the RFID tag 20, the control unit 15 determines whether or not the alarm permission timer exceeds a set value (80 ms). If not, the control unit 15 issues an approach alarm to the alarm output unit 14. Output.
電波受信部１２が受信した電波が他の距離検知制御装置１０からの固有ＩＤ電波である場合、制御部１５はその固有ＩＤ電波が既に受信済みのものであるか否かを判断し、受信済みでなければ、現在受信装置台数Ｎ（固有ＩＤ電波を受信した他の距離検知制御装置１０の台数Ｎ）を変更し、更に制御部１５は周期タイマの設定値を初期値（８０ｍｓ）×（Ｎ＋１）に変更する。 When the radio wave received by the radio wave receiving unit 12 is a unique ID radio wave from another distance detection control device 10, the control unit 15 determines whether or not the unique ID radio wave has already been received and has been received. If not, the number N of current receiving devices (the number N of other distance detection control devices 10 that have received the unique ID radio wave) is changed, and the control unit 15 sets the set value of the periodic timer to the initial value (80 ms) × (N + 1). ).
このように本発明では、複数の距離検知制御装置１０のうち一の距離検知制御装置１０の電波受信部１２が他の距離検知制御装置１０からの固有ＩＤ電波を受信すると、前記一の距離検知制御装置１０の制御部１５が、周期タイマの設定値を増加させることにより、そのＩＤ送信部１３からの固有ＩＤ電波及び誘導磁界送信部１１からの誘導磁界の送信を所定時間Ｔ延期する。この所定時間Ｔは、本実施例では、周期タイマの初期値（８０ｍｓ）×現在受信装置台数Ｎとなる。 As described above, in the present invention, when the radio wave receiving unit 12 of one distance detection control device 10 among the plurality of distance detection control devices 10 receives the unique ID radio wave from the other distance detection control device 10, the one distance detection control device 10. The control unit 15 of the control device 10 delays transmission of the unique ID radio wave from the ID transmission unit 13 and the induction magnetic field from the induction magnetic field transmission unit 11 by a predetermined time T by increasing the set value of the periodic timer. In this embodiment, the predetermined time T is the initial value of the periodic timer (80 ms) × the current number N of receiving devices.
例えば２台の距離検知制御装置１０が存在する場合、一方の距離検知制御装置１０が受信する他方の固有ＩＤ電波距離検知制御装置１０からの固有ＩＤ電波の数（現在受信装置台数Ｎ）は１であり、固有ＩＤ電波及び誘導磁界の送信が延期される所定時間Ｔは８０ｍｓとなる。 For example, when there are two distance detection control devices 10, the number of unique ID radio waves (current reception device number N) from the other unique ID radio wave distance detection control device 10 received by one distance detection control device 10 is 1. The predetermined time T for which the transmission of the unique ID radio wave and the induction magnetic field is postponed is 80 ms.
本実施例においてこの所定時間Ｔの間は、電波受信部１２がＲＦＩＤタグ２０からの磁界検知電波を受信したとしても接近警報は出力されない。所定時間Ｔの間は、上述の警報許可タイマが設定値（８０ｍｓ）を超えているからである。そして、所定時間Ｔを経過後は、図２の制御フローの初めに戻り、周期タイマ及び警報許可タイマがスタートする。 In this embodiment, during the predetermined time T, even if the radio wave receiving unit 12 receives the magnetic field detection radio wave from the RFID tag 20, no approach warning is output. This is because during the predetermined time T, the alarm permission timer described above exceeds the set value (80 ms). Then, after the predetermined time T has elapsed, the process returns to the beginning of the control flow of FIG. 2, and the cycle timer and the alarm permission timer are started.
図３は、２台の距離検知制御装置１０が存在する場合において図２の制御フローにより得られた、当該２台の距離検知制御装置１０（装置Ａ及び装置Ｂ）の動作フローを示す。図２の制御フローによれば、図３に示すように２台の距離検知制御装置１０（装置Ａ及び装置Ｂ）が所定の周期（８０ｍｓ）で交互に固有ＩＤ電波及び誘導磁界の送信を行い、装置Ａが固有ＩＤ電波及び誘導磁界の送信を行うサイクル（装置Ａ送受信許可）の間は、装置ＢがＲＦＩＤタグからの磁界検知電波を受信したとしても接近警報は出力されない。また、図３において装置Ｂが固有ＩＤ電波及び誘導磁界の送信を行うサイクル（装置Ｂ送受信許可）では、ＲＦＩＤタグから磁界検知電波が送信されていない（ＲＦＩＤタグが装置Ｂから送信される誘導磁界の到達範囲外にある）ので、装置Ｂで接近警報は出力されない。 FIG. 3 shows an operation flow of the two distance detection control devices 10 (device A and device B) obtained by the control flow of FIG. 2 when there are two distance detection control devices 10. According to the control flow of FIG. 2, as shown in FIG. 3, two distance detection control devices 10 (device A and device B) alternately transmit a unique ID radio wave and an induced magnetic field at a predetermined period (80 ms). During the cycle in which the device A transmits the unique ID radio wave and the induction magnetic field (device A transmission / reception permission), even if the device B receives the magnetic field detection radio wave from the RFID tag, the approach warning is not output. 3, in a cycle in which the device B transmits the unique ID radio wave and the induction magnetic field (device B transmission / reception permission), the magnetic field detection radio wave is not transmitted from the RFID tag (the induction magnetic field transmitted from the device B by the RFID tag). Therefore, the device B does not output an approach warning.
なお、図３に示すように、装置Ａ及び装置Ｂが交互に固有ＩＤ電波及び誘導磁界の送信を行うようになるのは、図２の制御フローで説明した「調整時間」の設定による。すなわち、装置Ａ及び装置Ｂが、それぞれ他方の固有ＩＤ電波を受信することで、その他方の装置の存在を検知できるので、「調整時間」の設定により、装置Ａ及び装置Ｂが交互に固有ＩＤ電波及び誘導磁界の送信を行うようにすることができる。この「調整時間」は０〜２２ｍｓ程度である。 As shown in FIG. 3, the devices A and B alternately transmit the unique ID radio wave and the induced magnetic field due to the “adjustment time” setting described in the control flow of FIG. 2. In other words, since the devices A and B can detect the presence of the other device by receiving the other unique ID radio wave, the devices A and B are alternately set to the unique ID by setting the “adjustment time”. Transmission of radio waves and induction magnetic fields can be performed. This “adjustment time” is about 0 to 22 ms.
また、図３では、２台の距離検知制御装置１０が存在する場合を示したが、例えば３台の距離検知制御装置１０（装置Ａ〜Ｃ）が存在する場合、図２の制御フローによれば、周期タイマが２４０ｍｓに変更され、また「調整時間」の設定により、装置Ａ〜Ｃが順番で固有ＩＤ電波及び誘導磁界の送信を行い、かつ、例えば装置Ａが固有ＩＤ電波及び誘導磁界の送信を行うサイクルでは、他の装置Ｂ，ＣがＲＦＩＤタグからの磁界検知電波を受信したとしても接近警報は出力されないようにすることができる。距離検知制御装置１０の台数が減少した場合も、その台数の減少を固有ＩＤ電波の受信の有無により検知できるので、図２の制御フローに準じて対応可能である。 Further, FIG. 3 shows a case where two distance detection control devices 10 exist. However, for example, when there are three distance detection control devices 10 (devices A to C), the control flow of FIG. For example, the period timer is changed to 240 ms, and by setting the “adjustment time”, the devices A to C transmit the unique ID radio wave and the induced magnetic field in order. In the transmission cycle, even when the other devices B and C receive the magnetic field detection radio wave from the RFID tag, it is possible to prevent the approach warning from being output. Even when the number of the distance detection control devices 10 decreases, the decrease in the number can be detected based on the presence / absence of reception of the unique ID radio wave, which can be dealt with according to the control flow of FIG.
１０ 距離検知制御装置
１１ 誘導磁界送信部
１２ 電波受信部
１３ ＩＤ送信部
１４ 警報出力部
１５ 制御部
１６ 電圧変換部
２０ 磁界検知機能付きＲＦＩＤタグ（ＲＦＩＤタグ）
２１ 磁界センサ部
２２ 電波送信部
２３ バッテリ
DESCRIPTION OF SYMBOLS 10 Distance detection control apparatus 11 Guidance magnetic field transmission part 12 Radio wave reception part 13 ID transmission part 14 Alarm output part 15 Control part 16 Voltage conversion part 20 RFID tag (RFID tag) with a magnetic field detection function
21 Magnetic field sensor part 22 Radio wave transmission part 23 Battery
Claims (3)
前記複数台の距離検知制御装置はそれぞれ、誘導磁界送信部と、電波受信部と、当該距離検知制御装置の固有ＩＤ電波を送信するＩＤ送信部と、前記接近警報を出力する警報出力部と、これらを制御する制御部とを備え、
前記磁界検知機能付きＲＦＩＤタグは、前記誘導磁界送信部から送信される誘導磁界を検知する磁界センサ部と、当該磁界センサ部が前記誘導磁界を検知したときに磁界検知電波を送信する電波送信部とを備え、
前記複数台の距離検知制御装置のうち一の距離検知制御装置の電波受信部が他の距離検知制御装置からの固有ＩＤ電波を受信すると、前記一の距離検知制御装置の制御部が、前記ＩＤ送信部からの固有ＩＤ電波及び前記誘導磁界送信部からの誘導磁界の送信を所定時間Ｔ延期すると共に、当該所定時間Ｔの間は前記電波受信部が前記磁界検知電波を受信したとしても接近警報は出力させず、前記所定時間Ｔを経過後に、前記ＩＤ送信部から固有ＩＤ電波及び前記誘導磁界送信部から誘導磁界を送信させると共に、前記電波受信部が前記磁界検知電波を受信したときに前記警報出力部から接近警報を出力させ、
前記電波受信部が固有ＩＤ電波を受信した他の距離検知制御装置の台数をＮとすると、前記制御部は、前記所定時間ＴをＴ×Ｎに設定する、接近警報システム。 An approach alarm system that detects an approach of a distance between a plurality of distance detection control devices and at least one RFID tag with a magnetic field detection function and outputs an approach alarm,
Each of the plurality of distance detection control devices includes an induction magnetic field transmission unit, a radio wave reception unit, an ID transmission unit that transmits a unique ID radio wave of the distance detection control device, an alarm output unit that outputs the approach alarm, A control unit for controlling these,
The RFID tag with a magnetic field detection function includes a magnetic field sensor unit that detects an induced magnetic field transmitted from the induction magnetic field transmission unit, and a radio wave transmission unit that transmits a magnetic field detection radio wave when the magnetic field sensor unit detects the induced magnetic field And
When the radio wave receiving unit of one distance detection control device among the plurality of distance detection control devices receives a unique ID radio wave from another distance detection control device, the control unit of the one distance detection control device receives the ID. The transmission of the unique ID radio wave from the transmission unit and the induction magnetic field from the induction magnetic field transmission unit is postponed for a predetermined time T, and even if the radio wave reception unit receives the magnetic field detection radio wave for the predetermined time T, an approach warning When the predetermined time T has elapsed, the ID transmission unit transmits the unique ID radio wave and the induction magnetic field transmission unit, and the radio wave reception unit receives the magnetic field detection radio wave. An approach alarm is output from the alarm output unit ,
An approach warning system in which the control unit sets the predetermined time T to T × N, where N is the number of other distance detection control devices that have received the unique ID radio wave .
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