JPS61234635A - Optical communication system - Google Patents
Optical communication systemInfo
- Publication number
- JPS61234635A JPS61234635A JP60075306A JP7530685A JPS61234635A JP S61234635 A JPS61234635 A JP S61234635A JP 60075306 A JP60075306 A JP 60075306A JP 7530685 A JP7530685 A JP 7530685A JP S61234635 A JPS61234635 A JP S61234635A
- Authority
- JP
- Japan
- Prior art keywords
- slave station
- station
- receiving
- transmitting
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H04B10/22—
Landscapes
- Optical Communication System (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は１位置を固定しかつその送信光および光受信特
性が無指向性である親局と、送受信ともに指向特性を有
する子局とからなる光通信システムに関するものである
。[Detailed Description of the Invention] [Field of Industrial Application] The present invention consists of a master station that is fixed at one position and whose transmission light and optical reception characteristics are omnidirectional, and a slave station that has directional characteristics for both transmission and reception. The present invention relates to an optical communication system.
親局と子局の間で双方向の光通信が成立するには各々の
送信光がそれぞれ相手局に受信されなければならない。In order to establish bidirectional optical communication between a master station and a slave station, each transmitted light must be received by the other station.
そのためには、子局の送信光線が親局に当り、かつ子局
の受信視野内に親局が存在しなければガらない。In order to do this, the transmitting beam of the slave station must hit the master station and the master station must be within the field of view of the slave station.
上の条件を満たすのに考えられる一つの方式は。What is one possible method to meet the above conditions?
ハーフミラ−とレンズを用いて送信と受信の光軸を一致
させる方式であるが、完全に一致させるには機構的に精
度を要し、経済的ではない。This method uses a half mirror and a lens to align the transmitting and receiving optical axes, but achieving perfect alignment requires mechanical precision and is not economical.
しかし送信光軸と受信光軸を別個の光学系を用いても両
軸を一致させることが出来ない。例えば第１図のように
、光源１とレンズ２から成る送信光軸と受光素子３とレ
ンズ４より成る受信光軸を角度を持たせること゛により
、交叉する部分においては送信光線と受信視野を一致さ
せることができるが、他の部分においては送信光が親局
に受信されている時に親局の送信光が光検出器３以外の
点に集光して受信不能である場合、及びその逆の場合が
しばしば発生する。However, even if separate optical systems are used for the transmission optical axis and the reception optical axis, it is not possible to make the two axes coincident. For example, as shown in Figure 1, by making the transmitting optical axis consisting of the light source 1 and lens 2 and the receiving optical axis consisting of the light receiving element 3 and lens 4 at an angle, the transmitting light beam and the receiving field of view can be adjusted at the intersection. However, in other parts, when the transmitted light is being received by the master station, the transmitted light from the master station is focused on a point other than the photodetector 3 and cannot be received, and vice versa. cases often occur.
子局の送信光の拡がり角と受信視野角を共に太きくシ、
第２図のように両者の重なる部分５を大きくすることに
より前記のような好捷しくない事態の発生を減少させる
ことが可能であるが、６０部分に親局が存在する場合に
は、子局は親局の光を受信できても親局に子局の送信光
が到達しない。Both the spread angle of the transmitted light and the receiving viewing angle of the slave station are widened.
It is possible to reduce the occurrence of the above-mentioned undesirable situation by enlarging the overlapping area 5 of the two as shown in Fig. 2, but if the master station exists in the area 60, Even if the station can receive the light from the master station, the transmitted light from the slave station does not reach the master station.
従って交叉する部分以外では使用できない。また第２図
５の部分に親局が存在するように子局の方向を調整しよ
うとすると、子局で親局の受信状態を知るには親局から
本来の伝送十べき信号以外に親局の受信状態を表わす情
報を信号光に乗せなければならず、電気回路が複雑とな
る。Therefore, it cannot be used anywhere other than where it intersects. Also, if you try to adjust the direction of the slave station so that the master station is in the area shown in Figure 2, 5, the slave station will need to receive signals from the master station in addition to the signals that should be transmitted from the master station. It is necessary to carry information indicating the reception status of the signal light on the signal light, which makes the electric circuit complicated.
本発明の目的は上記のような特別な電気回路を親局の受
信状態の表示のために備えなくとも、簡単に子局の方向
調整が行える光通信システムを提供しようとすることに
ある。SUMMARY OF THE INVENTION An object of the present invention is to provide an optical communication system in which the direction of a slave station can be easily adjusted without the need for a special electric circuit as described above to display the reception status of the master station.
以下余白
〔問題点を解決するための手段〕
本発明は上記の目的を達成するために、子局の送信光の
指向特性を受信指向特性よりも広くなるようにしたもの
である。[Means for solving the problem] In order to achieve the above-mentioned object, the present invention makes the directional characteristic of the transmitted light of the slave station wider than the receiving directional characteristic.
い、前記親局の送信光および受信晃の指向特性が前記子
局の移動範囲を冷で包含するように広く構成された光通
信システムにおいて、少くとも前記親局と子局の実用的
な距離の範囲内においては子局の受信視野が送信光の拡
がりの範囲内に含まれるよう送信指向特性を受信指向特
性よりも広く構成したことを特徴とする光通信システム
が得られる。In an optical communication system configured so that the directivity of the transmitting light and receiving light of the master station is wide enough to cover the moving range of the slave station, at least a practical distance between the master station and the slave station is provided. An optical communication system is obtained in which the transmission directional characteristic is configured to be wider than the reception directional characteristic so that the receiving field of the slave station is included within the spread range of the transmitted light within the range of .
第３図は本発明を適用した子局の一実施例における送信
光線と受信視野を示す図である。送信光線７の拡がり角
は受信視野８よりも広く設定されており１両者の光軸は
平行でなく交叉するように保持されている。図中の縦線
は受信視野８と送信光線７の共通部分を示す。第３図か
ら明らかなように９点９〜点１０の距離においては、受
信視野８は送信光ａ７の拡がり角に包含されている。点
９〜点１０の距離は実際に使用する場合の子局−親局間
距離の変化範囲より大と々るよう、送信。FIG. 3 is a diagram showing a transmission light beam and a reception field of view in an embodiment of a slave station to which the present invention is applied. The spread angle of the transmitting light beam 7 is set wider than that of the receiving field of view 8, and the optical axes of both are held so that they are not parallel but intersect. Vertical lines in the figure indicate common parts of the receiving field of view 8 and the transmitting light beam 7. As is clear from FIG. 3, at the distance between points 9 and 10, the receiving field of view 8 is included in the spread angle of the transmitted light a7. Transmission is made so that the distance between points 9 and 10 is greater than the variation range of the distance between the slave station and the master station in actual use.
受信レンズの焦点距離、光源の発光部寸法、受光素子の
アクティブエリア（感度を有する部分）の寸法および送
受光軸の角度によって設定する。このことは極めて容易
である。It is set based on the focal length of the receiving lens, the dimensions of the light emitting part of the light source, the dimensions of the active area (portion with sensitivity) of the light receiving element, and the angle of the transmitting and receiving optical axis. This is extremely easy.
上記のような設定状態においては、子局が親局の信号光
を受信できれば子局の送信光は必ず親局に到達する。し
たがって子局側で親局の受信状態を判別する手段が々く
とも、子局−親局相互の通信を成立させることが可能と
なる。また子局の方向調整は子局の受信状態のみをモニ
タしながら行えばよく、親局の受信状態をも同時にモニ
タしながら行うよりもはるかに容易に行える。In the above setting state, if the slave station can receive the signal light from the master station, the transmitted light from the slave station will definitely reach the master station. Therefore, if the slave station side has a means for determining the receiving state of the master station, it becomes possible to establish mutual communication between the slave station and the master station. Furthermore, the direction adjustment of the slave station can be carried out while only monitoring the reception status of the slave station, which is much easier than adjusting the direction of the slave station while simultaneously monitoring the reception status of the master station.
第４図はハーフミラ−１１を用いて送受を共通べたよう
に経済的でない。そこでこの本発′明の実施例では送信
光線７の拡がり角を受信視野８よりも広く設定したもの
で、これにより多少の機構的誤差があっても、子局が親
局の信号光を受信できるよう方向調整を行えば、子局の
送信した信号光は親局で必ず受信できる。FIG. 4 uses a half mirror 11 for common transmission and reception, which is not economical. Therefore, in this embodiment of the present invention, the spread angle of the transmitting light beam 7 is set wider than the receiving field of view 8, so that even if there is some mechanical error, the slave station can receive the signal light from the master station. If the direction is adjusted so that the signal light transmitted by the slave station can be received by the master station.
以上述べたように、送信光の拡がり角を受信視野角より
も広く設定することによって、子局の方向調整が、親局
の受信状態を子局側でチェックすることなく子局が親局
の信号光を受信するように行うのみで達成できるので容
易であり、また親局の受信状態を子局へ伝送する手段が
不要なため経済的であるという効果を発揮するものであ
る。As described above, by setting the spread angle of the transmitted light to be wider than the receiving viewing angle, the direction adjustment of the slave station can be performed without the slave station checking the reception status of the master station. This is easy to achieve as it can be achieved by simply receiving the signal light, and is economical since no means for transmitting the receiving status of the master station to the slave stations is required.
第１図は従来の方式で送受信光軸を交叉させた □
場合の光線の状態を示す図、第２図は従来の、方式で単
に送信光拡がり角と受信視野角を拡げた場合の状態を示
す図、第３図は本発明の方式を適用した一実施例の構成
を示す図、第４図は本発明の方式を送受同一光軸のシス
テムに適用した他の実施例の構成を示す図である。
記号の説明＝１は光源、２はレンズ、３は受光素子、４
はレンズ、７は送信光線、８は受信視野。
１１・けハーフミラ−９１２はレンズをそれぞれあられ
している。Figure 1 shows a conventional method in which the transmitting and receiving optical axes are crossed □
Figure 2 is a diagram showing the state of the light beam when the transmitting light spread angle and receiving viewing angle are simply widened using the conventional method, and Figure 3 is an example of an implementation using the method of the present invention. FIG. 4 is a diagram showing the configuration of another embodiment in which the method of the present invention is applied to a system having the same optical axis for transmitting and receiving. Explanation of symbols = 1 is the light source, 2 is the lens, 3 is the light receiving element, 4
is the lens, 7 is the transmitting beam, and 8 is the receiving field of view. 11. Half mirrors 912 each have a mirrored lens.
Claims (1)
空間伝搬による通信を行い、前記親局の送信光および受
信光の指向特性が前記子局の移動範囲を全て包含するよ
うに広く構成された光通信システムにおいて、少くとも
前記親局と子局の実用的な距離の範囲内においては子局
の受信視野が送信光の拡がりの範囲内に含まれるよう送
信指向特性を受信指向特性よりも広く構成したことを特
徴とする光通信システム。1. Communication is performed by optical space propagation between a fixed master station and a movable slave station, and the directional characteristics of the transmitted light and received light of the master station cover the entire movement range of the slave station. In an optical communication system with such a wide configuration, the transmission directivity characteristics are set so that the receiving field of the slave station is included within the spread of the transmitted light at least within the practical distance between the master station and the slave station. An optical communication system characterized by having a configuration that has a wider receiving directional characteristic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60075306A JPS61234635A (en) | 1985-04-11 | 1985-04-11 | Optical communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60075306A JPS61234635A (en) | 1985-04-11 | 1985-04-11 | Optical communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61234635A true JPS61234635A (en) | 1986-10-18 |
Family
ID=13572432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60075306A Pending JPS61234635A (en) | 1985-04-11 | 1985-04-11 | Optical communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61234635A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6453640A (en) * | 1987-05-18 | 1989-03-01 | Koito Kogyo Kk | Mobile body optical communication control system |
| JPH0314850U (en) * | 1989-06-28 | 1991-02-14 | ||
| JP2002094458A (en) * | 2000-09-19 | 2002-03-29 | Nakayo Telecommun Inc | Optical radio transmission system |
-
1985
- 1985-04-11 JP JP60075306A patent/JPS61234635A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6453640A (en) * | 1987-05-18 | 1989-03-01 | Koito Kogyo Kk | Mobile body optical communication control system |
| JPH0314850U (en) * | 1989-06-28 | 1991-02-14 | ||
| JP2002094458A (en) * | 2000-09-19 | 2002-03-29 | Nakayo Telecommun Inc | Optical radio transmission system |
| JP4542250B2 (en) * | 2000-09-19 | 2010-09-08 | 株式会社ナカヨ通信機 | Optical wireless transmission system |
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