JPS6313536A - Transmission/reception system - Google Patents

Abstract

PURPOSE:To widen the location of communication enable range by providing plural antennas while keeping a distance and switching an antenna changeover device in a time width or over required for data sending having one significance. CONSTITUTION:The control circuit 8 of a main body side master set 1 outputs a control signal switching the antenna changeover device 7 for the interval of, e.g., 1 sec, and the antenna changeover device 7 allows antennas 6a, 6b alternately to connect to a reception circuit 3 in response to the control signal. The connection time of the antennas 6a, 6b is set to be a time width required for the sending of a transmission circuit 11 after the output signal of a signal source at a terminal side is generated and a sending data generating circuit 10 generates a data signal having a significance. On the other hand, the sending data of a terminal equipment slave set 2 is sent twice per second corresponding to the number of antennas of the master set 1. Thus, even if the electric field strength of the antenna 6b is weak, no missing information is caused and high reliability is obtained.

Description

【発明の詳細な説明】 ［技術分野１ 本発明は屋内に設けられ、受信若しくは送信或いは送受
信可能な本体側親器と、夫々センサや手動スイッチ等の
信号源を有し送信若しくは受信或いは送受イ８可能な複
数の端末側子離との間で通信を行う無線システムに用い
る送受信方式に関するものである。[Detailed Description of the Invention] [Technical Field 1] The present invention is directed to a device which is installed indoors and has a main body side main device capable of receiving or transmitting or transmitting and receiving, and a signal source such as a sensor or a manual switch. The present invention relates to a transmission/reception method used in a wireless system that communicates with a plurality of terminals capable of communicating with each other.

［″ＰＩ景技術１ 受信若しくは送信或いは送受信可能な本体側親器と、夫
々センサや手動スイッチ等の４８号源を有し複数の送信
若しくは受信或いは送受信可能な複数の端末側子離との
闇で通信を行う無線システムを屋内に設ｇした場合、例
えば屋内電波伝播特性のマルチパスによるデッドポイン
トが生じで、受信がうまく出来ないことがあって通信可
能範囲が限られるという問題がある。特にセキリュティ
システムを構成した場合アンテナの位置がデッドポイン
トに有れば失報等重大な欠陥が生じることになる。[''PI technology 1 The darkness between the main device that can receive or transmit, and the multiple terminal devices that each have a 48 signal source such as a sensor or manual switch and can transmit or receive multiple signals. When a wireless system that performs communication is installed indoors, for example, dead points may occur due to multipaths in the indoor radio wave propagation characteristics, which may cause poor reception and limit the communication range.In particular. When a security system is configured, if the antenna is located at a dead point, serious defects such as missed alarms will occur.

「発明の目的１ 本発明は上述の問題、αに鑑みて為されたもので、その
目的とするところは伝送損失の大きい伝送路についでこ
れを補償して通信可能範囲を広げイに頻性の高い信号伝
送を実現した送受信方式を提供するにある。``Object of the Invention 1 The present invention was made in view of the above-mentioned problem α, and its purpose is to expand the communication range by connecting a transmission line with large transmission loss and thereby increasing the frequency of communication. The object of the present invention is to provide a transmission/reception method that achieves high signal transmission.

［発明の開示１ 本発明は受信若しくは送信或いは送受信可能な本体側親
器と、夫々センサや手動スイッチ等の信号源を有し送信
若しくは受信或いは送受信可能な複数の端末側子離との
間で通信を行う無線システムにおいて、本体ＩＩＩ器に
互いにＭ［離を隔てて配置した複数のアンテナを有し、
前記複数のアンテナを切Ｑ換えるアンテナ切り換え器と
、このアンテナ切り換え器を一つの意味を持つデータの
送信に必要な時間幅以上で以て切り換えるための制御手
段とを備え、データ送信の周期を応してアンテナを切り
換えることにより、車等の移動体に用いられているダイ
パーシティ方式のように高速でアンテナを切り換える必
要も無く、簡単に通信可能範囲を広げることができるこ
とを特徴とする。[Disclosure of the Invention 1] The present invention provides a method for transmitting or transmitting information between a main unit that is capable of receiving or transmitting data, and a plurality of terminal units that each have a signal source such as a sensor or a manual switch and that is capable of transmitting, receiving, or transmitting and receiving. In a wireless system that performs communication, a main unit III has a plurality of antennas arranged at a distance of M [from each other],
An antenna switching device for switching the plurality of antennas, and a control means for switching the antenna switching device with a time width longer than that required for transmitting data having one meaning, and adjusting the period of data transmission. By switching the antenna, there is no need to switch the antenna at high speed unlike the diversity method used in moving objects such as cars, and the communication range can be easily expanded.

以下本発明を実施例により説明する。The present invention will be explained below with reference to Examples.

１ｉＪＩ上 第１図は本実施例に用いる本体側親器１と端末側子離２
との回路構成を示しており、本体側親器１は受信機能の
みを持つもので、同調、検波、復調等の必要な回路を持
つ受信回路３と、受信復調された受信データ識別回路４
と、識別された受信データに基づいて表示を行う表示器
５と、互いに離れた位Ｈで且つ本体側親器１とは離れた
位置に設けられた２本のアンテナ６　ａ、　６　ｂと、
これらのアンテナ６　ａｔ　Ｂ　ｂを切り換えて受信回
路３に接続するアンテナ切り換え′ｌＳ７と、このアン
テナ切り換え器７を制御する制御手段を構成する制御回
路８とから構成される。1iJI Figure 1 shows the main unit 1 and terminal unit 2 used in this example.
The figure shows the circuit configuration of the main unit 1, which has only a reception function, and a reception circuit 3 which has necessary circuits such as tuning, detection, and demodulation, and a received data identification circuit 4 which is received and demodulated.
, a display device 5 that performs display based on the identified received data, and two antennas 6 a and 6 b provided at positions H apart from each other and away from the main device 1 on the main body side.
It is composed of an antenna switching 'lS7 which switches these antennas 6 at B b and connects them to the receiving circuit 3, and a control circuit 8 which constitutes a control means for controlling this antenna switching device 7.

一方端末側子器２は防犯、防災等のセンサや、非常押釦
のような信号［９がらのｆｆ１号を入力して所定形式の
データ信号を作成する送信データ発生回路１０と、送信
データを搬送波に乗せて送信する送信回路１１と、送信
用のアンテナ１２とから構成される。　本体側親器１の
制御回路８はアンテナ切り換え器７を例えば１秒間隔で
第２図（、）に示すように切り換える制御信号を出力す
るものであり、アンテナ切り換え器７はこの制御信号に
対応してアンテナ６　ａ、　６　ｂを交互に受信回路３
に接続する。On the other hand, the terminal-side slave device 2 includes sensors for crime prevention, disaster prevention, etc., and a transmission data generation circuit 10 that inputs signals such as emergency push buttons and creates a data signal in a predetermined format by inputting ff1 from 9, and a transmission data generation circuit 10 that generates a data signal in a predetermined format. It is composed of a transmitting circuit 11 for transmitting data on a computer, and a transmitting antenna 12. The control circuit 8 of the main device 1 outputs a control signal to switch the antenna switch 7 at intervals of, for example, one second as shown in FIG. 2 (,), and the antenna switch 7 corresponds to this control signal. The antennas 6a and 6b are alternately connected to the receiving circuit 3.
Connect to.

このアンテナ６　ａ、　６　ｂの接続時間（Ｔ＝１秒）
は第２図（ｂ）に示すように端末側の信号源９の出方信
号が発生してから、第２図（ｃ）に示すように送信デー
タ発生回路１０が一つの意味を持つデータ信号を作成し
、送信回路１１が送信するのに必要な時間幅以」二と設
定される。Connection time of these antennas 6a and 6b (T=1 second)
As shown in FIG. 2(b), after the output signal of the signal source 9 on the terminal side is generated, the transmission data generation circuit 10 generates a data signal with one meaning as shown in FIG. 2(c). is set to be longer than the time width required for the transmission circuit 11 to create and transmit.

一方端末側子器２の送信データ送出は本体側親器１のア
ンテナ本数に対応して２回１秒間隔で行うようになって
いる。On the other hand, the terminal-side slave device 2 transmits data twice at 1-second intervals, corresponding to the number of antennas of the main body-side master device 1.

而して第３図に示すように防犯、防災等のセンサ或いは
非常押釦などの信号源９を備えた複数の端末測子器２１
・・・と本体側親器１との間でデータ伝送を行う場合、
本体側親器１のアンテナ６ａ、６ｂの場所と電界強度の
関係は第４図のようにアンテナ６ａの場合Ａと、アンテ
ナ６ｂの場合Ｂとで異なり、同じ場所でも伝送路が異な
ることにより、アンテナ６ａでは受信限界り以下の電界
強度しか得られなくても、アンテナ６ｂでは受信限界Ｉ
、を越える電界強度が得られる。またその逆も成立し、
いずれにおいても受信限界りを越える電界強度が得られ
るアンテナ６ａ又は６ｂの受信信号を採用（第４図のＣ
曲線）すればよいことになる分けで、本実施例ではアン
テナ６　ａ、　６　ｂを交互に切り換えるとともに送信
データはアンテナ６　ａ、　６　ｂの切り換えに対応し
て２回送出するから、第５図に示すようにアンテナ６ａ
の位置ａでは電界強度が受信限界りを越え、アンテナ６
ｂの位［ｂでは電界強度が受信限界り以下である場合、
受信回路３では第２図（ｄ）に示すようにアンテナ６ｂ
の接続時には電界強度が弱く復調データは異常なデータ
となるが、アンテナ６ａの接続時には電界強度が強いた
め復調データは正常なデータとなり、この正常なデータ
を第２図（ｅ）のように受信データ識別回路４が識別し
、その識別により表示器５を第２図（ｆ）に示すように
動作させることができるのである。つまり一方のアンテ
ナ６ｂの電界強度が弱くても失報することが無く、高い
信頼性を得ることができるのである。As shown in FIG. 3, a plurality of terminal probes 21 are equipped with a signal source 9 such as a crime prevention or disaster prevention sensor or an emergency push button.
When transmitting data between ... and the main device 1,
The relationship between the location of the antennas 6a and 6b of the main unit 1 and the electric field strength is different between A for the antenna 6a and B for the antenna 6b as shown in FIG. 4, and even at the same location, the transmission paths are different. Even if antenna 6a can only obtain an electric field strength below the reception limit, antenna 6b can obtain field strength below reception limit I.
An electric field strength exceeding , can be obtained. The reverse also holds true,
In either case, the received signal from the antenna 6a or 6b that can obtain an electric field strength exceeding the reception limit is adopted (C in Fig. 4).
In this embodiment, the antennas 6a and 6b are alternately switched, and the transmission data is sent out twice in correspondence with the switching of the antennas 6a and 6b. As shown in the antenna 6a
At position a, the electric field strength exceeds the reception limit, and antenna 6
Place b [If the electric field strength is below the reception limit at b,
In the receiving circuit 3, as shown in FIG. 2(d), the antenna 6b
When the antenna 6a is connected, the electric field strength is weak and the demodulated data becomes abnormal data, but when the antenna 6a is connected, the electric field strength is strong, so the demodulated data becomes normal data, and this normal data is received as shown in Figure 2 (e). The data identification circuit 4 makes the identification, and the identification allows the display 5 to operate as shown in FIG. 2(f). In other words, even if the electric field strength of one antenna 6b is weak, there will be no misreporting, and high reliability can be obtained.

実１１例１ 本実施例では端末測子器２及び本体側親器１に送受信機
能を夫々備えており、第６図に示すように本体側親器１
は実施例１で示した受信機能に対応する受信回路３、受
信データ識別回路４、表示器５以外に、操作器１３と、
この操作器１３の操作時に送信データを発生する送信デ
ータ発生回路１４と、送信データ発生回路１４の送信デ
ータを搬送波に乗せで送信する送信回路１５とを備えて
おり、これら受信系の回路と、送信系の回路とは送受切
換スイッチ１６により切り換えられる。Actual Example 11 In this example, the terminal probe 2 and the main unit 1 on the main body side are each equipped with transmitting and receiving functions, and as shown in FIG.
In addition to the reception circuit 3, reception data identification circuit 4, and display 5 corresponding to the reception function shown in the first embodiment, there is also an operation device 13,
It is equipped with a transmission data generation circuit 14 that generates transmission data when the operation device 13 is operated, and a transmission circuit 15 that transmits the transmission data of the transmission data generation circuit 14 on a carrier wave, and these reception system circuits, The transmission system circuit is switched by a transmission/reception changeover switch 16.

７一 端末測子器２には実施例１で示した送信機能に対応する
信号源９、送信データ発生回路１０．送信回路１１以外
に、本体側親器１がらの送信データを受信復調する受信
回路１７と、復調データよりデータ内容を識別し、識別
出力により信号源９を動作せる受信データ識別回路１８
と、待機中に於いて受信回路１７を間歇動作させる間歇
受信タイミング信号を発生する間歇受信タイミング信号
発生回路１９とを備えでいる。7 - The terminal probe 2 includes a signal source 9 and a transmission data generation circuit 10 corresponding to the transmission function shown in the first embodiment. In addition to the transmitting circuit 11, there is a receiving circuit 17 that receives and demodulates the transmitted data from the main device 1 on the main body side, and a received data identifying circuit 18 that identifies the data content from the demodulated data and operates the signal source 9 by outputting the identified data.
and an intermittent reception timing signal generation circuit 19 that generates an intermittent reception timing signal that causes the reception circuit 17 to operate intermittently during standby.

しかして本体側親器１の送受切換スイッチ１６を受信側
に投入している状態では上述した実施例１の動作と同じ
であって端末測子器２がらの送信データを確実に受信す
ることがでトる。However, when the transmitting/receiving switch 16 of the main device 1 on the main body side is set to the receiving side, the operation is the same as that in the first embodiment described above, and the data transmitted from the terminal probe 2 cannot be reliably received. Toru.

−力木体側親器１の送受切換スイッチ１６を送信側に切
り換え投入している状態で、第７図（ａ）に示すように
操作器１３を操作すると、第７図（ｂ）に示すように送
信データ発生回路１４がらは−っの意味を持つ送信デー
タを２回連続して出力する。- When the transmitting/receiving changeover switch 16 of the main device 1 on the strength wood body side is switched to the transmitting side and is turned on, if the operator 13 is operated as shown in FIG. 7(a), the result will be as shown in FIG. 7(b). The transmission data generation circuit 14 outputs transmission data having a meaning of - twice in succession.

この連続送出に同期するようにアンテナ切り換え器７は
切換スイッチ７ａを制御回路８の制御信号に基づいて送
信データの送信時間Ｔ毎に送信回路１５に接続するアン
テナ６　ａ、　６　ｂをｔＪＳ７図（ｅ）に示すように
交互に切り換える。この切換えに応じてアンテナ６ａ、
６ｂから交互に送信回路１５からの送信出力を発射し、
送信データを送信する。In synchronization with this continuous transmission, the antenna switch 7 connects the antennas 6 a and 6 b to the transmitter circuit 15 at every transmission time T of the transmit data based on the control signal of the control circuit 8 by switching the changeover switch 7 a (see FIG. 7). Switch alternately as shown in e). In response to this switching, the antenna 6a,
6b alternately emit the transmission output from the transmission circuit 15,
Send outgoing data.

他方端末測子器２では受信回路１７が間歇受信タイミン
グ発生回路１９により第７図（ｄ）に示すように間歇受
信動作を待機中に行っており、上記送信データが受信さ
れると第７図（ｅ）に示すように送信データが連続２回
受信できる期間中受信状態となり、その期間中に受信デ
ータを復調識別する。ここで端末測子器２のアンテナ１
２の位置Ｘと、本体側親器１のアンテナ６ａ、６ｂがら
発射される電波の電界強度の関係は第８図に示すような
関係にあり、アンテナ６ａの場合Ａ゛ではアンテナ１２
の位置の電界強度は受信限界■、より大きく、アンテナ
６ｂの場合Ｂ”ではアンテナ１２の位置の電界強度は受
信限界りより小さい。従って復調データはアンテナ６ａ
からの場合には第７図（ｆ）に示すように正常であるが
、アンテナ６ｂがらの場合には異常となり、第７図（ｇ
）に示すよ）に受信データ識別回路１８では正常なデー
タを識別して出力を発生することになる。On the other hand, in the terminal probe 2, the reception circuit 17 performs an intermittent reception operation by the intermittent reception timing generation circuit 19 as shown in FIG. As shown in (e), the receiving state is maintained during a period in which transmission data can be received twice in succession, and the received data is demodulated and identified during that period. Here, antenna 1 of terminal probe 2
The relationship between the position X of 2 and the electric field strength of the radio waves emitted from the antennas 6a and 6b of the main device 1 is as shown in FIG.
In the case of antenna 6b, the electric field strength at the position of antenna 12 is smaller than the reception limit.
If the antenna 6b is empty, it is normal as shown in Fig. 7(f), but if the antenna 6b is empty, it is abnormal, and as shown in Fig. 7(g).
), the received data identification circuit 18 identifies normal data and generates an output.

［発明の効果１ 本発明は上述のように構成し本体側視器に互いに距離を
隔てて配置した複数のアンテナを有し、前記複数のアン
テナを切り換えるアンテナ切り換え器と、このアンテナ
切り換え器を１つの意味を持つデータの送信に必要な時
間幅以−１−で以て切り換えるための制御手段とを備え
たので、いずれかのアンテナに受信限界レベル以下に電
界強度が下がるデッドポイントができても、残りのアン
テナによるグイパーシチ効果によりデータを受信するこ
とができ、結果通信可能範囲の場所を実使用上広げるこ
とがでかるものであり、しかもこのアンテナ切り換え器
を１つの意味を持つデータの送信に必要な時間幅以上で
以て切り換えるための制御手段を備えているものである
から、移動体通信のようにアンテナを高速に切り換える
必要が無く、簡易にスペースグイパーシチの利、αを生
かせる効果を奏する。[Effects of the Invention 1] The present invention has a plurality of antennas configured as described above and arranged at a distance from each other on the side viewing device of the main body, an antenna switching device for switching the plurality of antennas, and a single antenna switching device. Since the antenna is equipped with a control means for switching within the time width required for transmitting data with two meanings, even if there is a dead point in any antenna where the electric field strength drops below the reception limit level, , data can be received by the remaining antenna's guipersity effect, and as a result, the communication range can be expanded in practical use.Moreover, this antenna switcher can be used to transmit only meaningful data. Since it is equipped with a control means for switching over a required time span, there is no need to switch antennas at high speeds as in mobile communications, and the advantage of space wireless communication can be easily utilized. play.

【図面の簡単な説明】 第１図は本発明の実施例１の回路構成図、第２図は同上
の動作説明用タイムチャート、第３図は同上の使用説明
図、第４図は同上の本体側視器の使用アンテナの電界強
度と位置関係の説明図、第５図は同上の実動作中の本体
側視器の使用アンテナの電界強度を示す説明図、第６図
は本発明の実施例２の回路構成図、第７図は同上の動作
説明用タイムチャート、第８図は同上の実動作中の本体
側視器の使用アンテナの電界強度を示す説明図であり、
１は本体側視器、２は端末測子器、３は受信回路、４．
１８は受信データ識別回路、５は表示器、６ａ、６ｂ、
１２はアンテナ、７はアンテナ切り換え器、８は制御回
路、９は信号源、１０，１４は送信データ発生回路、１
１．１５は送信回路１．１６は送受切換スイッチ、１９
は間歇受信タイミング発生回路である。 代理人　弁理士　石　１）艮　七 第１し 本４木便１ｕ１ らｎ 第６図 第７図[Brief Description of the Drawings] Fig. 1 is a circuit configuration diagram of Embodiment 1 of the present invention, Fig. 2 is a time chart for explaining the operation of the same, Fig. 3 is a diagram for explaining the use of the same, and Fig. 4 is a diagram of the same as the above. An explanatory diagram of the electric field strength and positional relationship of the antenna used in the main body side viewing device, FIG. 5 is an explanatory diagram showing the electric field strength of the antenna used in the main body side viewing device during actual operation, and FIG. 6 is an illustration showing the implementation of the present invention. A circuit configuration diagram of Example 2, FIG. 7 is a time chart for explaining the operation of the above, and FIG. 8 is an explanatory diagram showing the electric field strength of the antenna used in the main body side viewing device during actual operation of the above.
1 is a main body side sight device, 2 is a terminal probe device, 3 is a receiving circuit, 4.
18 is a received data identification circuit, 5 is a display, 6a, 6b,
12 is an antenna, 7 is an antenna switcher, 8 is a control circuit, 9 is a signal source, 10 and 14 are transmission data generation circuits, 1
1.15 is the transmission circuit 1.16 is the transmission/reception switch, 19
is an intermittent reception timing generation circuit. Agent Patent Attorney Ishi 1) Ai 7th 1st Shimoto 4th Kibin 1u1 Ran Fig. 6 Fig. 7

Claims (4)

【特許請求の範囲】[Claims] （１）受信若しくは送信或いは送受信可能な本体側親器
と、夫々センサや手動スイッチ等の信号源を有し送信若
しくは受信或いは送受信可能な複数の端末側子器との間
で通信を行う無線システムにおいて、本体側親器には互
いに距離を隔てて配置した複数のアンテナを有し、前記
複数のアンテナを切り換えるアンテナ切り換え器と、こ
のアンテナ切り換え器を一つの意味を持つデータの送信
に必要な時間幅以上で以て切り換えるための制御手段と
を備えたことを特徴とする送受信方式。(1) A wireless system that performs communication between a main unit that can receive or transmit, and a plurality of terminal slave units that each have a signal source such as a sensor or manual switch and that can transmit or receive or transmit and receive. , the main device has a plurality of antennas arranged at a distance from each other, an antenna switcher for switching the plurality of antennas, and a time required for transmitting data having one meaning. A transmitting/receiving method characterized by comprising a control means for switching when the width is greater than or equal to the width. （２）本体側親器は受信機能を備えたものとし、端末側
子器は送信機能を備えたものとし、本体側親器には複数
のアンテナを切り換えて受信回路に接続するアンテナ切
り換え器と、アンテナ切り換え器を端末側子器の一つの
意味を持つデータの送信時間以上の幅の周期で切り換え
る制御手段と、前記受信回路の復調データを識別して表
示させる受信データ識別回路とを備えたことを特徴とす
る特許請求の範囲第１項記載の送受信方式。(2) The main unit on the main unit shall be equipped with a receiving function, the slave unit on the terminal side shall be equipped with a transmitting function, and the main unit on the main unit shall be equipped with an antenna switching device that switches multiple antennas and connects them to the receiving circuit. , comprising a control means for switching the antenna switching device at a period longer than the transmission time of data having one meaning of the terminal side slave device, and a received data identification circuit for identifying and displaying the demodulated data of the receiving circuit. A transmission/reception system according to claim 1, characterized in that: （３）本体側親器は送受信機能を備えたものとし、端末
側子器は送受信機能を備えたものとし、本体側親器には
複数のアンテナを送信回路又は受信回路のいずれかに接
続する送受切換手段と、複数のアンテナを送信回路又は
受信回路のいずれかに切換接続するアンテナ切り換え器
と、アンテナ切り換え器を切り換える周期を一つの意味
を持つ送信側データの送信時間以上の幅の周期で切り換
える制御手段とを備え、端末側子器には送信データ発生
回路と、この送信データ発生回路の出力データを入力し
て送信する送信回路と、端末側子器に設けたアンテナよ
り信号を入力して端末側子器に設けた受信データ識別回
路に復調データを出力する受信回路と、前記親器のアン
テナの切換え周期とほぼ同じ同一の周期で受信回路を間
歇受信動作させるための間歇受信タイミング信号を発生
させる間歇受信タイミング信号発生回路とを少なくとも
備えたことを特徴とする特許請求の範囲第１項記載の送
受信方式。(3) The main unit on the main unit shall be equipped with a transmitting and receiving function, the slave unit on the terminal side shall be equipped with a transmitting and receiving function, and the main unit on the main unit shall have multiple antennas connected to either the transmitting circuit or the receiving circuit. A transmitting/receiving switching means, an antenna switching device for switchingly connecting a plurality of antennas to either the transmitting circuit or the receiving circuit, and a period for switching the antenna switching device to a period having a width equal to or longer than the transmission time of data on the transmitting side having one meaning. The terminal side slave device includes a transmission data generation circuit, a transmission circuit that inputs and transmits the output data of the transmission data generation circuit, and a signal input from an antenna provided on the terminal side slave device. a receiving circuit that outputs demodulated data to a receiving data identification circuit provided in a slave unit on the terminal side; and an intermittent reception timing signal for causing the receiving circuit to perform intermittent reception operation at the same cycle that is almost the same as the switching cycle of the antenna of the main unit. 2. The transmitting/receiving system according to claim 1, further comprising: an intermittent reception timing signal generating circuit that generates an intermittent reception timing signal. （４）複数のアンテナを本体側親器から離れた位置に配
置したことを特徴とする特許請求の範囲第１項又は第２
項又は第３項記載の送受信方式。(4) Claim 1 or 2, characterized in that a plurality of antennas are arranged at a position away from the parent device on the main body side.
Transmission/reception method described in Section 3 or Section 3.