JP2004349905A - Spatial optical transmission apparatus - Google Patents

Spatial optical transmission apparatus Download PDF

Info

Publication number
JP2004349905A
JP2004349905A JP2003142860A JP2003142860A JP2004349905A JP 2004349905 A JP2004349905 A JP 2004349905A JP 2003142860 A JP2003142860 A JP 2003142860A JP 2003142860 A JP2003142860 A JP 2003142860A JP 2004349905 A JP2004349905 A JP 2004349905A
Authority
JP
Japan
Prior art keywords
light
plate
substrate
transmitting
transmitting plate
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.)
Granted
Application number
JP2003142860A
Other languages
Japanese (ja)
Other versions
JP4279047B2 (en
Inventor
Katsushi Shimamoto
勝史 島本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP2003142860A priority Critical patent/JP4279047B2/en
Publication of JP2004349905A publication Critical patent/JP2004349905A/en
Application granted granted Critical
Publication of JP4279047B2 publication Critical patent/JP4279047B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Landscapes

  • Optical Communication System (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To prevent return light from an own light projecting element from entering a light receiving element as a disturbance component and to perform stable transmission and reception even if the orientation angles of the light projecting element and light receiving element are changed corresponding to installation places and position relation with terminal equipment. <P>SOLUTION: This apparatus is provided with a transmitting and receiving substrate 2 where a light projecting element 3 and a light receiving element 4 are arranged, a light-transmission plate 10 for letting light that transmits it passes through at least the regions of the light emitted by the light projecting element 3 and light received by the light receiving element 4, a projection part 11 which is formed on the reverse surface of the light-transmission plate 10, a light blocking plate 12 which is fixed to the projection part 11 in contact with the reverse surface of the light transmission plate 10 and attenuates the light in the light emission area of the light projecting element 3, a cover 9 which holds the light transmission plate 10, and a chassis 1 which holds the transmitting and receiving substrate 2. The light blocking plate 12 is arranged between the light projecting element 3 and light receiving element 4 by fitting the cover 9 to the chassis 1, and a tip part of the light blocking plate 12 comes into contact with the surface of the transmitting and receiving plate 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、空間に放出された光によって信号を伝送する空間光伝送装置に関し、特に投光素子と受光素子の両方を備えて送受相互の信号を伝送する空間光伝送装置に関する。
【０００２】
【従来の技術】
従来の空間光伝送装置は、投光素子からの近赤外線の戻り光を受光するための自発光キャンセル用の受光素子と加算器とを設けて、受信信号から自発光による外乱成分を除去しながら、投光素子と受光素子の前方の近赤外線透過フィルタ内側の隔壁に対応した箇所に、断面半円状の溝を隔壁に沿って形成し、組み付けた状態で隔壁の先端部が半円断面状の溝に嵌入されて密着することで、良好なデータ伝送が得られるようにしている（例えば、特許文献１参照）。
【０００３】
また、従来の他の空間光伝送装置は、投光素子と受光素子を接近配備して送受ユニットを一体化し、これを回転させる機構を備えることで、外部機器との光通信が可能な領域を確保している（例えば、特許文献２参照）。
【０００４】
【特許文献１】
特開平１１−１６８４３５号公報（第３−６頁、図３）
【特許文献２】
特開２０００−２０１１０８号広報（第２−３頁、図１）
【０００５】
【発明が解決しようとする課題】
しかしながら、上記特許文献１に記載のような従来の空間光伝送装置では、近赤外線透過フィルタの厚みに応じて半円断面状の溝の深さが決まるため、フィルタの厚みが小さい場合は溝の深さも小さくなり、光の伝搬の抑制効果が低くなるという課題があった。特に、フィルタの溝と隔壁の先端部との密着面が投光素子および受光素子の指向性の強い前方側に位置しているため、小さな戻り光でも外乱成分となり、受光素子に到達しやすいという課題があった。
【０００６】
また、受光素子以外に自発光キャンセル用の受光素子を新たに設け、第２の基板上に自発光キャンセル回路新たに設けなければならず、部品点数の増加による製造コストの増大や省スペース化が図れないという課題があった。
【０００７】
また、上記特許文献２に記載のような従来の空間光伝送装置では、端末機器との位置関係に応じて送受ユニット全体を自由に回転できるようにすると、思わぬ誤操作によって配向状態が容易に変化してしまうという課題があった。
【０００８】
本発明は、このような課題を解決するためになされたものであり、自己の投光素子からの戻り光が外乱成分となって受光素子に侵入することを防止でき、かつ設置場所や端末機器との位置関係に応じて投光素子と受光素子の配向角を変更しても安定した送受信ができる空間光伝送装置を得ることを目的とするものである。
【０００９】
【課題を解決するための手段】
本発明の空間光伝送装置は、
投光素子および受光素子を配設した送受基板と、
少なくとも前記投光素子の発光する光および前記受光素子で受光される光の領域を透過する透光板と、
前記透光板の裏面に形成された突起部と、
前記透光板の裏面に密着して前記突起部に固定され、前記投光素子の発光領域の光を減衰させる遮光板と、
前記透光板が保持されるカバーと、
前記送受基板が保持されるシャーシと
を備え、
前記カバーを前記シャーシに取り付けることにより、前記遮光板が、前記投光素子と前記受光素子の間に配置され、前記遮光板の先端部が前記送受基板の表面に密着する
ことを特徴とするものである。
【００１０】
【発明の実施の形態】
実施の形態１．
図１は本発明の実施の形態１の空間光伝送装置の分解斜視図であり、図２および図３はその断面図である。この実施の形態１の空間光伝送装置は、シャーシ１と、送受基板２と、投光素子３と、受光素子４と、メイン基板７と、基板接続ケーブル８と、カバー９と、透光板１０と、遮光板１２とを備えている。
【００１１】
図１において、シャーシ１は、壁面などに本装置全体を据え付けて固定するためのもので、送受基板２が特定の傾斜角で固定されている。この送受基板２には、赤外発光ダイオード等の近赤外線を発光する投光素子３と、フォトダイオード等の光を電圧に変換する受光素子４とが実装されている。また、シャーシ１には、メイン基板７も固定されている。このメイン基板７は、投光素子３に送信信号を出力する送信回路部（図示しないが、以下の説明において符号「５」を付す）と、受光素子４からの受信信号が入力される受信回路部（図示しないが、以下の説明において符号「６」を付す）とが実装されている。
【００１２】
送受基板２とメイン基板７とは、基板接続ケーブル８で接続されている。また、メイン基板７には、外部のレコーダー１０１（図４参照）から映像信号を入力する映像入力信号ケーブル１０３、電源を供給するための電源供給ケーブル１０４、そしてレコーダー１０１を制御するための制御信号ケーブル１０５が接続されている。
【００１３】
一方、この実施の形態１の空間光伝送装置の前面に取り付けられるカバー９には、正面下部から底面にかけての一角に開口部が形成されており、そこに近赤外線などの特定の波長の光のみを透過するアクリル樹脂などの素材で成型された透光板１０が取り付けられている。
【００１４】
そして、図２および図３に示すように、透光板１０の裏側には、カバー９とシャーシ１を嵌合させた状態において投光素子３と受光素子４の間に位置する部分に突起部１１が成型されている。この突起部１１が投光素子３に向かい合う面には、特定の波長の光を遮光する遮光板１２が両面粘着材１３によって固定されている。
【００１５】
また、カバー９にはカバー固定ネジ穴１４が設けられており、カバー９をシャーシ１に嵌合させた状態でカバー固定ネジ１５をカバー固定ネジ穴１４に通し、シャーシ１側の４箇所に設けられたネジ取り付け部１６に結合させて、カバー９がシャーシ１に取り付けられる。
【００１６】
図４は本発明の実施の形態１の空間光伝送装置を用いて構成された伝送システムの斜視図である。この図４に示すシステムは、カメラユニット１０６で撮像された映像を記録するレコーダー１０１とこのレコーダー１０１を制御してその映像を監視する端末機器１０２との間の撮像映像信号や各種制御信号の遠隔的な送受信を、実施の形態１の空間光伝送装置１００によって中継するする監視システムの例であり、空間光伝送装置１００と端末機器１０２との間で、空間に放出された光によって信号の伝送がなされる。
【００１７】
次に、この実施の形態１の空間光伝送装置１００によって構成されるシステム全体の動作について、図４も用いて説明する。空間光伝送装置１００が設置される部屋の天井１１１に設置された通電状態のレコーダー１０１には、同室内に別に設置されているカメラユニット１０６で撮像されたコンポジット映像信号がカメラ映像ケーブル１０７による接続で入力されており、撮影された画像の映像信号の記録および再生が可能な状態となっている。また、このレコーダー１０１から電源供給ケーブル１０４にてメイン基板７に電源が供給されており、送信回路部５、受信回路部６などの各部に配電されている。
【００１８】
レコーダー１０１で記録後、再生された映像信号は、映像入力信号ケーブル１０３によってメイン基板７に入力され、送信回路部５に送られる。送信回路部５では、この入力映像信号をＦＭ変調し、その変調信号を基板接続ケーブル８によって送受基板２の投光素子３へ供給し、近赤外線に変換されて空間に放射される。
【００１９】
一方、投光素子３から放射された近赤外線は、システム操作者または端末機器保持台１０９への据え付けによって空間光伝送装置１００の投光素子３と受光素子４に対向するように向けられた端末機器１０２の受光素子で受信され、電気信号に変換された後に映像信号に復調されてモニタ画面１１２上に映し出される。従って、その映像を端末機器１０２において操作者が確認することで、レコーダー１０１で再生または記録された映像の状態を把握できる。
【００２０】
また、端末機器１０２に設けられた操作ボタン１１３からレコーダー１０１の操作コマンドを入力すると、コマンドデータが生成された後に振幅変調され、端末機器１０２の投光素子で近赤外線に変換されて空間に放射され、これを空間光伝送装置１００の受光素子４が受光して電気信号に変換する。そして、この受信信号を基板接続ケーブル８によってメイン基板７に送り、受信回路部６にてコマンドデータが復元され、制御信号ケーブル１０５でレコーダー１０１に送られ、レコーダー１０１がコマンドを受け付けると動作が実行される。
【００２１】
図５（ａ）は投光素子３および端末機器１０２の投光素子の光学特性図であり、図５（ｂ）は受光素子４の光学特性図である。図５（ａ）中の２０１は投光素子３の放射強度特性を、２０４および２０５は端末機器１０２の投光素子の放射強度特性を、それぞれ示している。また、図６（ａ）は投光素子３の放射指向性を示す図であり、図６（ｂ）は受光素子４の受光指向性を示す図である。また、図７は透光板１０および遮光板１２の光学特性図である。図７中の２０３は透光板１０の光の透過率を示した透過率曲線を、図７中の２０６は遮光板１２の透過率曲線を、それぞれ示している。
【００２２】
次に、カバー９をシャーシ１上に取り付け状態での伝送動作について、図５〜図７を用いて光学的に説明する。投光素子３が発光する近赤外線は、図５（ａ）に示す波長ｆ０をピークとする放射強度特性２０１を持っており、さらに図６（ａ）に示す投光指向曲線３０１に示すように放射中心軸方向で最大放射強度となる指向特性で放射される。そして、この投光素子３は、放射中心軸が送受基板２に対して垂直方向となるように実装されており、より強力な放射強度が得られるように複数個実装されている。
【００２３】
また、投光素子３から放射される近赤外線を受光する端末機器１０２の受光素子には、フォトダイオード等の光−電圧変換素子を用い、波長ｆ０で最大受光感度が得られる素子を選択して配設されている。
【００２４】
一方、受光素子４は、図５（ｂ）に示す受光感度曲線２０２のような波長ｆ０を含む広範囲の波長で感度の高い受光特性を持った汎用的な受光素子である。このように、受光素子４で波長の異なる複数の近赤外線に対して感度良く受光できるようにすることで、投光側の素子の発光する近赤外線の波長に選択性を持たせている。
【００２５】
例えば、端末機器１０２（図４参照）側の投光素子の発光波長が受光感度曲線２０２上の特定の受光感度以上となる範囲に含まれていれば、図５（ａ）に示す放射強度特性２０４のように波長ｆ１に選択する場合と、図５（ａ）に示す放射強度特性２０５のように他の波長ｆ２に選択する場合のいずれの場合にも、受光特性には大差が生じないため、放射強度と受光後の信号処理が同じであれば、異なる波長の近赤外線を発する複数の端末機器１０２からの操作を受け付けられることになる。
【００２６】
なお、受光素子４の指向性は、図６（ｂ）に示す受光指向曲線３０２のように受光中心軸方向で最大感度を持つが、端末機器１０２の操作位置に自由度が高くなるように相対感度の半値角が４５°以上の広指向特性となっており、受光素子４は、この受光中心軸が送受基板２に対して垂直方向となるように実装されている。
【００２７】
これに対して、透光板１０は、図７に示す透過率曲線２０３のような特性を持っており、投光素子３から放射される波長ｆ０にピーク波長を持った近赤外線や端末機器１０２の投光素子から放射される波長ｆ１にピーク波長を持った近赤外線を透過し、これより波長の短い光、例えば可視光などは吸収して透過しない性質を持つ。このように、透光板１０は、投光素子３から放射された近赤外線と、受光素子４の受光波長ｆ１に合わせて設定された端末機器１０２の投光素子から放射される近赤外線との両方を、他の可視光などの外乱光線から分光して効率良く透過する性質を持つ。
【００２８】
また、遮光板１２は、図７に示す透過率曲線２０６のような特性を持っており、特定の波長領域の光について大きな減衰の得られる特性を持ったアクリル樹脂等の素材で成型されている。このように、遮光板１２は、透光板１０とは異なり、投光素子３が発する波長ｆ０をピークとする近赤外線領域の光を減衰させて透過しない特性を持っている。
【００２９】
この遮光板１２は、図２および図３に示すように、透光板１０側に面した部分が透光板１０の裏面に密着するように、透光板１０の裏面の形状に応じて成型されており、さらにその先端部が、カバー９をシャーシ１に取り付けた際に送受基板２に密着するように、送受基板２のシャーシ１への取り付け角度に応じた形状に成型されている。そして、この遮光板１２を透光板１０の裏面に密着させ、送受基板２側の先端が突起部１１からせり出した状態となるように、突起部１１の投光素子３に面する側（以下、投光室側とする）に両面粘着材１３にて固定されている。
【００３０】
そして、このように遮光板１２が取り付けられた透光板１０をカバー９の開口部に取り付け、さらにこのカバー９をシャーシ１上に取り付けることにより、メイン基板７と送受基板２が覆われるとともに、送受基板２上の投光素子３と受光素子４の間に突起部１１に固定した遮光板１２が挿入され、カバー９とシャーシ１をカバー固定ネジ１５で固定させることにより、カバー９がシャーシ１に圧着されて、遮光板１２の先端部が送受基板２に密着する。これにより、カバー９、透光板１０、シャーシ１、および送受基板２によって構成された空間が、遮光板１２によって、投光素子３の配設空間である投光室と、受光素子４の配設空間である受光室とに分離される。
【００３１】
この状態で、投光素子３から放射された近赤外線は、透光板１０の裏側から入射して反対側の表面より放射されるが、投光室内で反射した近赤外線は、遮光板１２によって減衰し、突起部１１の受光素子４に対面する側（以下、受光室側とする）への侵入が抑制される。
【００３２】
以上のように実施の形態１によれば、透光板１０の裏面の形状に合わせて成型された遮光板１２を、透光板１０と一体成型した突起部１１の投光室側に、透光板１０の裏面に密着するように固定しておくことで、受光室側への投光素子３から放射された近赤外線の侵入光を阻止することができる。
【００３３】
なお、上記実施の形態１では、送信回路部５は周波数変調方式の信号を送信し、受信回路部６は振幅変調方式の信号を受信しているが、他の変調方式および復調方式であっても良い。この場合、双方を異なる変復調方式として透光板１０よりも外部の空間伝送経路における送受信信号の干渉を軽減しておくことが望ましい。
【００３４】
また、図８（ａ）に示すように、遮光板１２の表面や送受基板２上の投光室内に面する部分には、近赤外線領域の光を吸収する近赤外線吸収部材１７を塗布または貼り付けても良い。この場合、投光室内での不要な乱反射光や遮光板１２に照射される近赤外線の強度を抑え、受光室側への近赤外線の侵入を抑制することができる。
【００３５】
さらに、図８（ｂ）に示すように、送受基板２において投光素子３と受光素子４の間に空孔１８を設け、この空孔内に遮光板１２の先端部を貫通させても良い。この場合、カバー９とシャーシ１の嵌合力のばらつきによる投光室から受光室への近赤外線の侵入を防止することができる。
【００３６】
また、上記実施の形態１では、透光板１０および遮光板１２はともにアクリル樹脂素材にて成型しているが、所定の分光特性および遮光特性が満足できればガラス部材や金属部材などの異なる素材であっても良い。この場合、設置環境に応じて素材を選択することで耐候性の向上を図ることができる。
【００３７】
また、上記実施の形態１では、突起部１１への遮光板１２の固定に両面粘着材１３を用いているが、耐候性を持つ硬化型の接着剤を用いて固定されていても良い。この場合、時間経過に伴う固定力の低下を最小限に止めることができる。
【００３８】
実施の形態２．
図９は本発明の実施の形態２の空間光伝送装置の断面図である。なお、図９に示す実施の形態２の空間光伝送装置が図１〜図３に示す上記実施の形態１の空間光伝送装置に対して主に異なる点は、遮光板１２の形状、突起部１１にガイドレール２１を設けている点、および透光板１０の裏面の形状であり、投光素子３、受光素子４、および透光板１０の光学特性と端末機器１０２等の他の構成は上記実施の形態１と同じであるため、共通する部分には同じ符号を付してその説明を省略し、異なる点を重点的に説明する。
【００３９】
図９において、透光板１０の裏側に面した遮光板１２の先端部には、投光室側にＬ字状に傾斜する傾斜部１９が設けられ、透光板１０の投光室側の裏面には、段差部２０が形成されている。また、突起部１１の投光室側には、ガイドレール２１が形成されており、遮光板１２は、傾斜部１９の先端側からガイドレール２１に沿って挿入され、突起部１１と透光板１０に沿って保持されている。
【００４０】
遮光板１２をガイドレール２１に挿入する際に、傾斜部１９が押し広げられた状態でガイドレール２１内を進行し、傾斜部１９がガイドレール２１から突出した時点で、遮光板１２自体の復元力によって元のＬ字状の傾斜状態に戻る。さらに挿入してゆくと、傾斜部１９の先端が透光板１０の裏面の段差部２０に突き当たった状態で停止する。このとき、突起部１１の先端から遮光板１２の一部が突出した状態となっている。
【００４１】
次に、カバー９をシャーシ１上に取り付けることにより、送受基板２の投光素子３と受光素子４との間に突起部１１のガイドレール２１に係止された遮光板１２が挿入され、突起部１１から突出した部分が送受基板２の表面に圧着されることにより、ガイドレール２１に沿って遮光板１２が透光板１０の方向に移動し、傾斜部１９の段差部２０への密着度、つまり遮光板１２の透光板１０への密着度が増加する。
【００４２】
遮光板１２が透光板１０と送受基板２の両方に圧着された状態になると、傾斜部１９の屈折部分の角度が遮光板１２自体の弾力性によって変形し、カバー９の押圧力のばらつきが吸収されて密着性が保たれる。そして、シャーシ１の４箇所のネジ取り付け部１６にカバー固定ネジ穴１４よりカバー固定ネジ１５で固定することで、密着性がより強固なものとなる。
【００４３】
以上のように実施の形態２によれば、遮光板１２に傾斜部１９を設け、カバー９とシャーシ１の嵌合時に遮光板１２がガイドレール２１に沿って透光板１０側に押し出されるようにすることで、透光板１０への遮光板１２の密着度が向上し、投光室側から受光室側への近赤外線の侵入を効果的に防止し、安定した送受信を行うことができる。
【００４４】
なお、上記実施の形態２において、遮光板１２を一定の圧力で透光板１０に押し当てた状態で、接着材などによって固定しても良い。この場合、傾斜部１９が透光板１０に密着するために充分な押圧を印加しておくことで、送受基板２と遮光板１２の接触力が弱い場合でも透光板１０裏面における遮光状態を保持させることができる。
【００４５】
さらに、遮光板１２の傾斜部１９を透光板１０側と送受基板２側の両方に設けても良い。この場合、透光板１０と送受基板２の両方への押圧のばらつきが吸収され、さらに安定した遮光性が得られる。
【００４６】
また、図１０に示すように、遮光板１２は突起部１１の両面を囲むような形状であっても良い。この場合、突起部１１全体が遮光板１２で覆われることにより、突起部１１内部に侵入し、受光室側に放射される近赤外線も同時に遮光でき、より一層近赤外線の遮光性を向上することができる。
【００４７】
実施の形態３．
図１１は本発明の実施の形態３の空間光伝送装置の断面図である。なお、図１１に示す実施の形態３の空間光伝送装置が図１〜図３に示す上記実施の形態１の空間光伝送装置に対して主に異なる点は、透光板１０および突起部１１の光学的特性であり、投光素子３、受光素子４、および端末機器１０２等の他の構成は上記実施の形態１と同じであるため、共通する部分には同じ符号を付してその説明を省略し、異なる点を重点的に説明する。
【００４８】
図１１に示すように、カバー９をシャーシ１に嵌合させた状態において、突起部１１の先端部は、送受基板２の表面に達するまでの突出量を持たせて形成されており、透光板１０と突起部１１の接合部から突起部全体にかけては、連続的に近赤外線の透過率を変化させた投光室側領域の透光板１０ａ、受光室領域の透光板１０ｂ、および突起部領域の透光板１０ｃの各部分が一体成型されている。
【００４９】
図１２は透光板１０およびその突起部１１の光学特性図である。図１２（ａ）中の２０７は投光室側領域の透光板１０ａの光の透過率を示した透過率曲線を、２０８は受光室側領域の透光板１０ｂの透過率曲線を、２０９は突起部１１および突起部１１との接合部領域の透光板１０ｃの透過率曲線を、それぞれ示している。また、図１２（ｂ）は透光板１０の正面方向から見た各領域の位置と特定波長の光に対する透過率の関係を示したものであり、図１２（ｂ）中の２１０は投光素子３が放射する波長ｆ０の近赤外線に対する透過率曲線を、２１１は端末機器１０２側の投光素子から放射される波長ｆ１の近赤外線に対する透過率曲線を、それぞれ示している。
【００５０】
次に、カバー９をシャーシ１上に取り付けた状態における伝送動作について説明する。図１２（ａ）に示す透過率曲線２０７の特性を有する投光室側領域の透光板１０ａでは、投光素子３から放射される波長ｆ０の近赤外線が透過されるため、端末機器１０２（図４参照）側の受光素子として波長ｆ０に高い受光感度を持つ素子を備えることにより効率良く受光される。
【００５１】
投光素子３から放射される波長ｆ０の近赤外線の内で、特に放射中心軸より外れた方向に放射されたものについては、投光室内の隔壁に反射し、様々な入射角を持って透光板１０ａに侵入し、透光板１０ａの表側の空間に透過されるが、その一部は透光板１０ａの内部を反射しながら伝搬する。
【００５２】
この場合、受光室側領域の透光板１０ｂの方向に進む赤外線は、図１２（ｂ）に示す透過率曲線２１０の特性のような透過率の変化によって、途中の突起部領域である透光板１０ｃに近づくにつれて減衰し、最終的には遮蔽される。
【００５３】
また、投光素子３から直接突起部１１に入射した場合にも、反対側の受光室側の空間に透過されない状態となる。
【００５４】
また、受光室側領域の透光板１０ｂにおいては、波長ｆ０の近赤外線に対して透過率が低くなっており、透光板１０ａ側から放射された投光素子３からの波長ｆ０の近赤外線が外界の物体に当たって反射し、透光板１０ｂの正面から入射する場合であっても、受光室内の空間への透過が阻止される。
【００５５】
一方、図１２（ａ）に示す透過率曲線２０８の特性を有する受光室側領域の透光板１０ｂでは、波長ｆ１の近赤外線に対しては高い透過率となっており、端末装置１０２の投光素子から放射された近赤外線は、受光室内の受光素子４に到達することができる。
【００５６】
受光素子４が波長ｆ０およびｆ１の両方に対して受光可能な広い受光特性を持った場合でも、端末機器１０２側の投光素子が放射する赤外線の波長ｆ１に合わせて受光室側領域の透光板１０ｂの分光特性を選択し、カバー９への装着の組み合わせを変えるだけで、投光室側および外界からの波長ｆ０の近赤外線は、図１２（ｂ）に示す透過率曲線２１０の特性のような透過率の変化によって受光素子４に到達しなくなる。
【００５７】
逆に、端末機器１０２からの波長ｆ１の近赤外線は、図１２（ｂ）に示す透過率曲線２１１の特性のような透過率の変化によって受光素子４に到達することができるため、その結果受光素子４の受光面における波長ｆ０と波長ｆ１の放射強度の相対比は大きくなり、波長ｆ０の近赤外線による受光素子４の誤動作が抑制される。
【００５８】
以上のように実施の形態３によれば、受光素子４自身が特定の受光特性を備えている場合であっても、透光板１０の投光室側および受光室側さらにその間にある突起部領域に投光素子３と端末機器１０２の投光素子の発光波長に応じて異なった透過率を持たせて構成することにより、受光素子４自体の受光特性を補うことができ、端末機器１０２側投光素子と、投光素子３の２つの波長の組み合わせによる外乱光を減衰させて良好な受光が可能になる。
【００５９】
さらに、透光板１０が投光室領域１０ａ、受光室領域１０ｂ、突起部領域１０ｃの透過特性の異なる素材で一体成型されていることにより、透光板１０の表面に段差や隙間が生じないので埃の侵入や蓄積による透光板１０の光学的特性の劣化を防止できるとともに、カバー９への組み込み時の作業性を向上させることができる。
【００６０】
実施の形態４．
図１３は本発明の実施の形態４の空間光伝送装置の断面図である。なお、図１３に示す実施の形態４の空間光伝送装置が図１〜図３に示す上記実施の形態１の空間光伝送装置に対して主に異なる点は、受光素子４の上に補助透光板２２が設けられている点、透光板１０の光学的特性であり、投光素子３、受光素子４、および端末機器１０２等の他の構成は上記実施の形態１と同じであるため、共通する部分には同じ符号を付してその説明を省略し、異なる点を重点的に説明する。
【００６１】
図１３において、アクリル樹脂などの素材を用いて成型された補助透光板２２は、その先端部分に設けられた固定部２３を送受基板２上の切り欠き部２４にはめ込むことにより、固定部２３の先端の返り部２５が送受基板２に嵌合して係止され、受光素子４全体を送受基板２の表面まで覆うように配置されている。
【００６２】
図１４は透光板１０および補助透光板２２の光学特性図である。図１４中の２１２は波長ｆ０における透光板１０の透過率曲線を、２１３は同じく波長ｆ０における補助透光板２２の透過率曲線を、それぞれ示している。
【００６３】
まず、補助透光板２２の送受基板２への取り付け状態について説明する。補助透光板２２の送受基板２側の先端部分に設けられた固定部２３は、補助透光板２２の側面部分から内側方向に押力を加えることによって若干内側に変形し、押力を解除すると素材の弾性によって元の位置に復元する。この補助透光板２２の固定部２３に押力を加えた状態で、送受基板２の切り欠き部２４に挿入し、その後押力を解除することによって送受基板２に係止され、かつ自由に着脱することが可能になっている。
【００６４】
次に、カバー９をシャーシ１上に取り付けた状態における伝送動作について説明する。図１４に示す透過率曲線２１２の特性を有する透光板１０は、投光素子３から放射される波長ｆ０の近赤外線および端末機器１０２の投光素子から放射される波長ｆ１の近赤外線の両方の波長の光に対して透過率が高い。そのため、波長ｆ０の近赤外線は、透光板１０の投光室側裏面から表側に透過され、波長ｆ０に対して高い受光感度を持つ端末機器１０２（図２参照）の受信部にて受信される。
【００６５】
また、端末機器１０２の投光素子から放射される波長ｆ１の近赤外線は、透光板１０の表側より受光室内に透過されて補助透光板２２の透光板１０に面している表面に到達し、さらに補助透光板２２内部に入射する。このとき、図１４に示す透過率曲線２１３の特性を有する補助透光板２２の分光特性により、波長ｆ０付近の成分は、減衰して受光素子４に面している内側の表面に透過されないが、波長ｆ１付近の成分は、透過して受光素子４に面している内側へと透過して、受光素子４の受光面に到達する。
【００６６】
従って、受光素子４における波長ｆ０の付近の近赤外線が端末機器１０２の投光素子から放出される波長ｆ１の近赤外線の放射強度に比べて極めて小さくなり、その結果、受光素子４の受光面における波長ｆ０と波長ｆ１の放射強度の相対比が大きくなり、波長ｆ０の近赤外線による受光素子４の誤動作が抑制される。
【００６７】
また、透光板１０から投光室内に入射して投光室内の内壁や送受基板２の表面に乱反射した近赤外線は、補助透光板２２の側面側にも到達するが、補助透光板２２が受光素子４全体を覆うように送受基板４に取り付けられているために、これらの方向から到達した近赤外線に対しても、波長ｆ０付近の近赤外線は減衰し、波長ｆ１付近の近赤外線は透過される。
【００６８】
従って、受光素子４の受光中心軸から大きく外れた方向から受光面に到達する近赤外線の場合にも、波長ｆ１付近の放射強度に比べて波長ｆ０付近の放射強度が極めて小さくなる。
【００６９】
なお、受光素子４自体の持つ波長ｆ０に対する受光感度が波長ｆ１に対して極めて小さい場合は、補助透光板２２の上記取り付け構造により、補助透光板２２を容易に取り外して対応することができる。
【００７０】
以上のように実施の形態４によれば、投光室側と受光室側の両方に共通の分光特性を持つ素材で成型された透光板１０を配置し、投光素子３および端末機器１０２側の投光素子の各素子が放射する近赤外線に高い受光感度を示す受光素子４を用いる場合であっても、端末機器１０２側の投光素子の波長に合致した分光特性を補助透光板２２に持たせ、かつ送受基板２に着脱可能とすることで、透光板１０および受光素子４の汎用性が向上することによる部品および製造時のコストの低減が図れる。
【００７１】
また、固定部２３と返り部２５を送受基板２の切り欠き部２４から取り外すことで、補助透光板２２を脱着可能な構造としたため、端末機器１０２の投光素子の光学特性に合わせた補助透光板２２の分光特性の選択が可能となり、より良好な受光特性を得るための微調整が容易に行える。
【００７２】
なお、上記実施の形態４では、補助透光板２２の固定部２３を送受基板２上に係止させているが、固定部２３を受光素子４の本体に係止させる構造であっても良い。この場合、補助透光板２２の大きさを必要最小限にすることで材料の低コスト化を図れるだけでなく、送受基板２上の切り欠き部２４が不要となるので、部品配置可能な面積を増やすことができ、基板上のスペースを有効に利用することができる。
【００７３】
さらに、図１５に示すように、補助透光板２２と受光素子４の受光面の間において特定の電位となり、かつ受光面前方のみに開口部を設けた電磁遮蔽板２６を配置しても良い。この場合、送受基板２の面積が小さく、投光素子３と受光素子４の配置が近くても、投光素子３から発生する高周波電磁ノイズによる受光素子４への影響を軽減できる。特に、受光素子４に電気的な信号増幅回路を内蔵した素子を使用する場合にも、高周波電磁ノイズの流入を防ぐことができるだけでなく、受光室内に侵入した波長ｆ０の近赤外線が補助透光板２２の透過率曲線２１３によって電磁遮蔽板２６の表面に到達しないので、電磁遮蔽板２６の表面で近赤外線が反射されることによる受光室内での乱反射光の発生を軽減でき、受光素子４の受光面で安定した受光が行える。
【００７４】
また、上記実施の形態４の空間光伝送装置は、上記実施の形態１の空間光伝送装置に補助透光板２２を設けたものであるが、上記実施の形態２の空間光伝送装置に補助透光板２２を設けることも可能である。
【００７５】
実施の形態５．
図１６は本発明の実施の形態５の空間光伝送装置の断面図である。なお、図１６に示す実施の形態５の空間光伝送装置が図１〜図３に示す上記実施の形態１の空間光伝送装置に対して主に異なる点は、透光板１０裏面の突起部１１および遮光板１２の代わりに、近赤外線吸収部材１７を配設した点、スペーサー２７と成型遮光板２８が送受基板２に備えられている点であり、投光素子３、受光素子４、および端末機器１０２等の他の構成は上記実施の形態１と同じであるため、共通する部分には同じ符号を付してその説明を省略し、異なる点を重点的に説明する。
【００７６】
図１６において、投光素子３および受光素子４は、近赤外線領域の波長の光に対して低い透過率の素材で成型されたスペーサー２７を介して送受基板２に固定されている。スペーサー２７の投光素子３と受光素子４との間には、成型遮光板２８が一体成型されている。また、透光板１０裏面の成型遮光板２８に対向する部分には、近赤外線吸収部材１７が成型遮光板２８の先端面よりも広い面となるように貼り付けられている。
【００７７】
次に、カバー９をシャーシ１上に取り付けた状態における伝送動作について説明する。図１６に示すように、カバー９をシャーシ１に取り付けると、スペーサー２７から突出した成型遮光板２８の先端部と透光板１０裏面に貼り付けられた近赤外線吸収部材１７との間に間隙が生じる。この間隙の幅は、カバー９とシャーシ１との嵌合力のばらつきによって変化し得る状態となっている。
【００７８】
投光素子３の放射中心軸から外れた方向に放射される波長ｆ０の近赤外線は、受光室の内壁を反射しながら透光板１０に入射し、透光板１０の表側に透過され、外部の空間に放出されることで端末機器１０２（図４参照）で受信される。また、その一部は、透光板１０裏面で反射して投光室内に戻る。その場合、投光室と受光室を分離している成型遮光板２８に対向する部分では、透光板１０の裏側に取り付けられた近赤外線吸収部材１７に到達する反射光が吸収され、この間隙を通って受光室側に侵入する二次反射光が発生しなくなり、間隙付近での近赤外線が反射抑制される。
【００７９】
以上のように実施の形態５によれば、投光室と受光室の間に配置した成型遮光板２８と対向する透光板１０の裏側に近赤外線吸収部材１７を固定することで、カバー９とシャーシ１の嵌合状態やそのばらつきによって間隙の大きさが変化した場合でも、受光素子４の前方から到達する投光室側からの波長ｆ０の近赤外線の侵入を抑制でき、端末機器１０２からの波長ｆ１の近赤外線の受光性を向上させることができる。
【００８０】
なお、近赤外線吸収部材１７の投光室側および受光室側の両端の外周部は、図１７（ａ）に示すように、投光素子３の放射指向性および受光素子４の受光指向性に応じて、抉り取られた形状とすることで、近赤外線吸収部材１７による送信および受信の死角を最小限にすることができ、投光素子３から放射される近赤外線を効果的に吸収しつつ良好な送受信指向特性を得ることができる。なお、近赤外線吸収部材１７の投光室側または受光室側のいずれかの外周部のみを抉り取られた形状とすることも可能である。
【００８１】
また、近赤外線吸収部材１７は、透光板１０の裏側のみでなく、図１７（ｂ）に示すように、対向する成型遮光板２８の先端面にも固定すると、成型遮光板２８の先端面による二次反射がなくなり、各近赤外線吸収部材１７で近赤外線の吸収が行われることによって、受光室側への波長ｆ０の近赤外線の侵入を一層抑制することができる。
【００８２】
さらに、成型遮光板２８先端部に取り付ける近赤外線吸収部材１７は、図１７（ｃ）に示すように、Ｕ字状にして、成型遮光板２８の先端部分から側壁部分にかけて覆うように固定すると、成型遮光板２８の投光室側の面での近赤外線の不要な乱反射成分を相対的に抑制できるとともに、成型遮光板２８の厚さが薄い場合であっても近赤外線吸収部材１７の保持の安定化と組立時の作業性の向上を図ることができる。
【００８３】
実施の形態６．
図１８は本発明の実施の形態６の空間光伝送装置の断面図である。なお、図１８に示す実施の形態６の空間光伝送装置が図１〜図３に示す上記実施の形態１の空間光伝送装置に対して主に異なる点は、透光板１０の構造、光誘導部材３０を備えた点であり、投光素子３、受光素子４、および端末機器１０２等の他の構成は上記実施の形態１と同じであるため、共通する部分には同じ符号を付してその説明を省略し、異なる点を重点的に説明する。
【００８４】
図１８において、透光板１０の受光室側には、受光素子４と対向する部分に受光窓２９が設けられている。そして、この受光窓２９内を貫通するように光誘導部材３０が挿入され、光誘導部材３０の側面部に設けられた位置決め部３１が透光板１０の裏面の光誘導部材固定部３２に嵌合して固定されている。また、受光窓２９を形成する透光板１０の内壁に対向する部分を含む光誘導部材３０の外周全体には、遮光部材３３が塗布されている。
【００８５】
光誘導部材３０は、近赤外線領域の光に対して投光素子３が放射する波長ｆ０付近の近赤外線領域のみを特に減衰させるアクリル樹脂等の素材で成型されている。そして、この光誘導部材３０は、端末機器１０２（図４参照）の投光素子から放射された波長ｆ１を中心とする近赤外線を含んで受光素子４が受信可能範囲の波長の近赤外線を透過する特性を持っている。この特性の例としては、上記実施の形態４の図１４に示した補助透光板２２の透過率曲線２１３と同様の光学特性を持ったものである。
【００８６】
次に、光誘導部材３０の形状と透光板１０への取り付け状態について説明する。透光板１０の裏側から受光窓２９に光誘導部材３０の一端を挿入し、外周部分に形成された位置決め部３１が透光板１０の裏面に当てられると同時に、光誘導部材固定部３２が位置決め部３１の裏側に入り込んで嵌合することで固定されている。また、光誘導部材３０を透光板１０の側より引き抜いて嵌合が解除されることにより、自由に取り外しが可能な状態となっている。
【００８７】
光誘導部材３０の受光窓２９に挿入される側の端面は、透光板１０の表面の形状と同じ平坦な形状となっている。また、反対側の面は、受光素子４の受光面よりも広い口径となっており、さらに凹面状に成型されている。
【００８８】
次に、カバー９をシャーシ１上に取り付け状態での伝送動作について説明する。カバー９をシャーシ１に取り付けた後にカバー固定ネジ１５で締め付けることにより、カバー９とシャーシ１の嵌合力が増し、光誘導部材３０の凹面部の外周の先端部が送受基板２に密着して固定される。このとき、光誘導部材３０の凹面部は受光素子４の受光面の真上（受光面に対向する位置）に配置され、受光素子４全体が光誘導部材３０によって覆われた状態となっている。
【００８９】
端末機器１０２側の投光素子から放射される波長ｆ１の近赤外線を受光素子４の最大受光感度が得られる波長の範囲内に選択しておくと、この近赤外線が透光板１０の受光窓２９内の光誘導部材３０の先端面に到達した際に、先端面付近での光誘導部材３０の分光特性によって波長ｆ１付近の近赤外線のみが透過され、その内部を反射しながら侵入して受光室内側先端部の凹面形状部まで到達し、受光素子４の受光面の真上から放射されて受光素子４に到達する。
【００９０】
例えば、投光室内の投光素子３から放射されて外界の物体等に反射して戻って来た波長ｆ０の近赤外線などの外乱光は、光誘導部材３０内を伝搬する間に、その分光特性によって減衰し、受光素子４の受光面に到達した時点の光強度は端末機器１０２側から到達した波長ｆ１の近赤外線に比べて極めて小さくなっている。
【００９１】
また、透光板１０が投光素子３および受光素子４に接近している場合には、投光素子３から放射された近赤外線の一部が透光板１０の内部を伝搬し、受光室側の受光窓２９の内面より放出される。そして、光誘導部材３０と受光窓２９の内面との間隙より受光室内側に侵入した近赤外線は、光誘導部材３０表面の遮光部材３３によって光誘導部材３０内部への侵入が阻止され、また光誘導部材３０が受光素子４全体を覆っているために受光室内での受光素子４への到達も阻止される。
【００９２】
以上のように実施の形態６によれば、透光板１０に設けた受光窓２９の内側に特定の分光特性を持ち遮光部材３３で包囲した光誘導部材３０を固定するにより、受光素子４への投光素子３からの近赤外線の到達を防止して端末機器１０２からの近赤外線の受光精度を向上させるとともに、遮光板１２による受光素子４の受光指向性への影響を軽減できるので、良好な受光特性が得られる。
【００９３】
なお、図１９（ａ）に示すように、光誘導部材３０の受光窓２９側の端面を透光板１０表面よりも突出させて、透光板１０表面から放射された投光素子３からの近赤外線が、光誘導部材３０の透光板１０側の先端部から侵入するのを抑制することも可能である。この場合には、遮光部材３３を透光板１０から突出した光誘導部材３０の先端までも包囲して、投光素子３からの近赤外線の光誘導部材３０側面への入射を防止することが望ましい。
【００９４】
また、図１９（ｂ）に示すように、光誘導部材３０の透光板１０側の先端部に凹面形状部３０ａを形成して、端末機器１０２から到達する近赤外線の受光指向性を補っても良い。さらに、図１９（ｃ）に示すように、複数の凹面形状部３０ｂを形成しても良く、端末機器１０２から到達する近赤外線の受光指向性を補うことができる。
【００９５】
また、上記実施の形態６の空間光伝送装置は、上記実施の形態１の空間光伝送装置に光誘導部材３０を設けたものであるが、上記実施の形態２の空間光伝送装置に光誘導部材３０を設けることも可能である。
【００９６】
実施の形態７．
上記実施の形態１では、シャーシ１の筐体自体に送受基板２を固定するため、投光素子および受光素子の配向角度が一定の角度に固定されているが、以下に説明する実施の形態７では、カバー９の選択に応じた投光素子と受光素子の配向角度に送受基板２の取り付け角度が調節されるものである。
【００９７】
図２０は本発明の実施の形態７の空間光伝送装置の分解斜視図であり、図２１、図２２はその断面図である。また、図２３は本発明の実施の形態７の空間光伝送装置の設置例を示す図である。この実施の形態７の空間光伝送装置は、シャーシ１と、投光基板３５と、受光基板３６と、投光素子３と、受光素子４と、メイン基板７と、投光基板接続ケーブル３７と、受光基板接続ケーブル３８と、カバー９と、透光板１０と、遮光板１２と、回転軸３９と、基板支持部４０とを備えている。
【００９８】
なお、図２０〜図２２に示す実施の形態７の空間光伝送装置が図１〜図３に示す上記実施の形態１の空間光伝送装置に対して主に異なる点は、送受基板２の代わりにこれを分割して投光基板３５と受光基板３６を設けた点、回転軸３９による回転構造およびシャーシ１の構造、突起部１１と遮光板１２の形状であり、投光素子３、受光素子４、および透光板１０の光学特性と端末機器１０２等の他の構成は上記実施の形態１と同じであるため、共通する部分には同じ符号を付してその説明を省略し、異なる点を重点的に説明する。
【００９９】
図２０または図２１において、投光素子３を実装した投光基板３５と受光素子４を実装した受光基板３６は、ともに基板支持部４０によって回転軸３９に固定され、さらに回転軸３９を中心に一定範囲内で回転するようにシャーシ１に設けられた軸受け部４１に取り付けられている。
【０１００】
また、シャーシ１上のメイン基板７と投光基板３５および受光基板３６とは、投光基板接続ケーブル３７および受光基板接続ケーブル３８によってそれぞれ接続され、投光基板３５と受光基板３６の両基板の間隔は、カバー９をシャーシ１に装着した際に遮光板１２に対向する位置にあって、遮光板１２の厚み以上の間隔で取り付けられている。
【０１０１】
また、突起部１１の先端には、投光室側にせり出したストッパー部３４が設けられ、突起部１１の受光室側の側面には、遮光板１２が両面粘着材１３にて固定されている。
【０１０２】
図２２に示すように、遮光板１２には突起部１１の先端部から回転軸３９の直径よりも広い幅の軸溝４２が設けられ、カバー９をシャーシ１に取り付ける際に回転軸３９がこの軸溝４２内を貫通しながら移動するような形状で開けられており、その先端部には面取り部４３が形成されている。
【０１０３】
また、突起部１１の先端の形状は、カバー９に応じて決められた角度で成型されている。例えば、この実施の形態７の空間光伝送装置の設置場所として、図２３（ａ）に示すように壁面１１０に取り付けられる場合と、図２３（ｂ）に示すように室内の天井１１１に水平に下向きに取り付けられる場合のように、設置条件に応じて異なる形状のカバー９ａおよび９ｂがあらかじめ用意される場合において、それぞれ異なった角度の先端部形状の突起部１１が成型された透光板１０ａおよび１０ｂが取り付けられている。
【０１０４】
次に、カバー９をシャーシ１に取り付ける際の動作について説明する。遮光板１２の面取り部４３を投光基板３５と受光基板３６の間に位置するようにカバー９をシャーシ１に取り付けると、遮光板１２の軸溝４２に沿って回転軸３９が差し込まれる。このとき、突起部１１先端にあるストッパー部３４が受光基板３６に接触しながら押し当てられるために、投光基板３５と受光基板３６が互いの位置関係を保持したまま回転軸３９によって回転し、突起部１１の先端形状に応じたストッパー部３４の傾斜角で保持される。
【０１０５】
続いて、シャーシ１側面に設けられた４箇所のネジ取り付け部１６にカバー固定ネジ１５で固定することにより、カバー９のシャーシ１への圧着力が増し、ストッパー部３４と投光基板３５上への密着状態が保持され、遮光板１２が投光基板３５と受光基板３６の間隙に完全に挿入された状態となる。
【０１０６】
例えば、図２３（ａ）に示すようにシャーシ１が壁面１１０に取り付けられる場合には、壁面１１０への取り付けに適合するカバー９ａを使用することにより、端末機器１０２のある正面下方向に投光素子３および受光素子４が配向されるように投光基板３５と受光基板３６が回転し、投光素子３および受光素子４の送受信中心軸４０１ａが端末機器１０２の送受信部に配向され、送受信角４０２の範囲内での送受信が可能となる。
【０１０７】
また、図２３（ｂ）に示すように天井１１１に取り付けられる場合には、天井１１１への取り付けに適合するカバー９ｂを使用することにより、端末機器１０２のある真正面方向に投光素子３と受光素子４が配向され、送受信中心軸４０１ｂが端末機器１０２に配向され、カバー９ａを使用した場合と同じ送受信角４０２の範囲内での送受信が行えるようになる。
【０１０８】
そして、図２３（ａ）と図２３（ｂ）のいずれの場合にも、遮光板１２が投光基板３５と受光基板３６の間に挿入されているために、各基板の配向角が変化しても、投光室側から受光室側への波長ｆ０の近赤外線の侵入が阻止される。
【０１０９】
以上のように実施の形態７によれば、突起部１１の先端を傾斜角を持たせた形状とし、遮光板１２を投光基板３５と受光基板３６の間隙に挿入したまま傾斜角に応じて投光基板３５と受光基板３６を回転させることにより、受光素子４への投光素子３からの外乱光の侵入を防止しながら、カバー９の種類や端末機器１０２との位置関係に応じた投光素子３と受光素子４の配向角度が容易に調整することができるとともに、天井１１１や壁面１１０へのシャーシ１の設置時に行われる投光基板３５と受光基板３６の配向角度調整の作業性の向上が図れ、角度調整ミスを防止することができる。
【０１１０】
なお、上記実施の形態７において、突起部１１のストッパー部３４は、回転軸３９からできるだけ離れた受光基板３６の外周付近まで接触させることが望ましい。この場合、回転軸３９を中心に投光基板３５と受光基板３６が回転する際に必要となる押圧が小さくなり、カバー９をシャーシ１に取り付ける時に加える圧力が軽減でき、作業性がさらに向上できる。
【０１１１】
また、ストッパー部３４と受光基板３６とを点接触に近い数箇所の小さな接触部分で接触させても良い。この場合、突起部１１の先端と受光基板３６表面との間に間隙を確保できるので、受光基板３６上の部品実装や銅箔パターン引き回しの制約を緩和させることができ、部品実装度を向上させることができる。
【０１１２】
実施の形態８．
上記実施の形態７では、カバー９のシャーシ１への取り付け時に投光基板３５と受光基板３６が回転しながら配向角度が調節されるものであるが、以下に説明する実施の形態８は、カバー９をシャーシ１に取り付ける前にあらかじめ投光基板３５および受光基板３６の配向角度を微調整しておく必要がある場合に関するものである。
【０１１３】
図２４は本発明の実施の形態８の空間光伝送装置の分解斜視図であり、図２５および図２６はその断面図である。この実施の形態８の空間光伝送装置は、シャーシ１と、投光基板３５と、受光基板３６と、投光素子３と、受光素子４と、メイン基板７と、投光基板接続ケーブル３７と、受光基板接続ケーブル３８と、カバー９と、可動透光板４４と、遮光板１２と、回転軸３９と、基板支持部４０と、配向角固定ナット４７と、ドームカバー４８と、カメラユニット１０６とを備えている。
【０１１４】
なお、図２４〜図２６に示す空間光伝送装置が図２０〜図２２に示す上記実施の形態７の空間光伝送装置に対して主に異なる点は、透光板１０の代わりに可動透光板４４を設けている点、遮光板１２の形状カバー９とシャーシ１の構造および配向角固定ナット４７を設けている点、およびカメラユニット１０６がシャーシ１上に取り付けられている点であり、投光素子３、受光素子４、および透光板１０の光学特性と端末機器１０２等の他の構成は上記実施の形態７と同じであるため、共通する部分には同じ符号を付してその説明を省略し、異なる点を重点的に説明する。
【０１１５】
図２４において、カバー９の正面上部と正面下部の一角の２箇所に開口部が設けられている。正面下部の開口部には、赤外線のみを透過する素材で形成された可動透光板４４が、その左右両側に設けられたボス４５をカバー９の開口部両側に設けた透光板軸受け部４６に嵌合させることによって取り付けられている。また、可動透光板４４は、ボス４５を軸に一定範囲内での回転が可能となっている。
【０１１６】
また、可動透光板４４の裏側には突起部１１が設けられており、その先端には投光室側にせり出したストッパー部３４が設けられ、受光室側の側面には遮光板１２が両面粘着材１３で固定されている。
【０１１７】
また、投光素子３を実装した投光基板３５と受光素子４を実装した受光基板３６は、ともに基板支持部４０によって回転軸３９に固定され、さらに回転軸３９を中心に可動するようにシャーシ１に設けられた軸受け部４１に取り付けられ、配向角固定ナット４７を締め付けることにより任意の角度で固定される。
【０１１８】
また、カメラユニット１０６がシャーシ１上に取り付けられている。このカメラユニット１０６は、シャーシ１上で上下左右方向に一定範囲内で自由に向きが調整できるようになっており、カメラユニット１０６からの撮像映像信号は、カメラ映像ケーブル１０７にてレコーダー１０１（図４参照）に入力されている。
【０１１９】
また、カバー９の正面上部には、アクリル樹脂等で成型されたドームカバー４８が、カバー９をシャーシ１に取り付けた状態にてカメラユニット１０６の正面に配置されるような位置に設けられており、ドームカバー４８を通してカメラユニット１０６で撮影される。
【０１２０】
次に、カバー９をシャーシ１に取り付ける際の動作について説明する。シャーシ１が壁面等に取り付けられた後、カバー９をシャーシ１に装着しない状態で投光基板３５および受光基板３６を回転軸３９によって回転させ、投光素子３と受光素子４を端末機器１０２（図２３参照）の配置に応じた最適な角度に調節し、配向角固定ナット４７を締め付けて固定させる。
【０１２１】
これとともに、カメラユニット１０６の向きも最適な方向に向けられるように調整する。その場合、端末機器１０２の位置に応じて投光素子３と受光素子４の向きがすでに調整されており、レコーダー１０１から出力される映像信号をメイン基板７の送信回路部５（図示せず）に送ることにより、カメラユニット１０６での撮像状態が端末機器１０２のモニタ画面上に映し出されるので、調整者は、この画像を確認しながらカメラユニット１０６の向きを調整する。
【０１２２】
投光基板３５および受光基板３６とカメラユニット１０６の向きが調整された後、カバー９をシャーシ１に取り付けることにより、遮光板１２が投光基板３５と受光基板３６の間に挿入されるとともに、軸溝４２に回転軸３９が差し込まれる。このとき、突起部１１のストッパー部３４が投光基板３５の表面に押し当てられ、投光基板３５の傾斜角度に応じて可動透光板４４が回転し、突起部１１の先端形状に応じたストッパー部３４の傾斜角度に応じて保持される。
【０１２３】
続いて、シャーシ１側面に設けられた４箇所のネジ取り付け部１６にカバー固定ネジ１５で固定することにより、カバー９のシャーシ１への圧着力が増し、ストッパー部３４と投光基板３５上への密着状態が保持される。
【０１２４】
以上のように実施の形態８によれば、突起部１１の先端に傾斜を持たせ、遮光板１２を投光基板３５と受光基板３６の間隙に挿入したまま傾斜角に応じて可動透光板４４および遮光板１２を自動的に配向させることにより、投光素子３から受光素子４への外乱光の遮蔽を保持しつつ、投光基板３５と受光基板３６の傾きに応じた最適な方向に可動透光板４４を配向させることができる。
【０１２５】
また、シャーシ１の壁面への取り付け位置および端末機器１０２の位置関係に応じて配向角度が様々に調整された投光基板３５と受光基板３６に対しても、可動透光板４４と突起部１１のストッパー部３４および遮光板４の形状や構造を共通化することができ、製造コストの低減が図れる。
【０１２６】
さらに、カメラユニット１０６の向きの調整時などのカバー９をシャーシ１から取り外した状態でのみ配向角度が調整できるので、カバー９を装着した通常設置状態での可動透光板４４の誤操作を防止することもできる。
【０１２７】
なお、上記それぞれの実施の形態では、投光素子３が６個用いたものを図示して説明を行ったが、投光素子３の数はこれに限るものではなく、１個以上あれば何個あっても構わないのはいうまでもない。
【０１２８】
【発明の効果】
以上説明したように本発明によれば、透光板の裏面の形状に合わせて成型された遮光板を、透光板と一体成型された突起部の受光素子に面する側に配置し、かつ透光板裏面に密着するように固定しておくことにより、シャーシへのカバー固定時に透光板裏面に密着するさせることができるので、投光素子から放射されて透光板裏面で反射した近赤外線が外乱成分となって受光素子に侵入することを効率良く防止することができ、かつ投光素子と受光素子の配向角を変更しても安定した送受信ができるという効果がある。
【図面の簡単な説明】
【図１】本発明の実施の形態１の空間光伝送装置の分解斜視図である。
【図２】本発明の実施の形態１の空間光伝送装置の断面図である。
【図３】本発明の実施の形態１の空間光伝送装置の断面図である。
【図４】本発明の実施の形態１の空間光伝送装置を用いて構成された伝送システムの斜視図である。
【図５】本発明の実施の形態１の空間光伝送装置においての投光素子および受光素子の光学特性図である。
【図６】本発明の実施の形態１の空間光伝送装置においての投光素子の放射指向性および受光素子の受光指向性を示す図である。
【図７】本発明の実施の形態１の空間光伝送装置においての透光板および遮光板の光学特性図である。
【図８】本発明の実施の形態１の他の空間光伝送装置の断面図である。
【図９】本発明の実施の形態２の空間光伝送装置の断面図である。
【図１０】本発明の実施の形態２の他の空間光伝送装置の断面図である。
【図１１】本発明の実施の形態３の空間光伝送装置の断面図である。
【図１２】本発明の実施の形態３の空間光伝送装置においての透光板およびその突起部の光学特性図である。
【図１３】本発明の実施の形態４の空間光伝送装置の断面図である。
【図１４】本発明の実施の形態４の空間光伝送装置においての透光板および補助透光板の光学特性図である。
【図１５】本発明の実施の形態４の他の空間光伝送装置の断面図である。
【図１６】本発明の実施の形態５の空間光伝送装置の断面図である。
【図１７】本発明の実施の形態５の他の空間光伝送装置を示す図である。
【図１８】本発明の実施の形態６の空間光伝送装置の断面図である。
【図１９】本発明の実施の形態６の他の空間光伝送装置においての光誘導部材近傍の断面図である。
【図２０】本発明の実施の形態７の空間光伝送装置の分解斜視図である。
【図２１】本発明の実施の形態７の空間光伝送装置の断面図である。
【図２２】本発明の実施の形態７の空間光伝送装置の断面図である。
【図２３】本発明の実施の形態７の空間光伝送装置の設置例を示す図である。
【図２４】本発明の実施の形態８の空間光伝送装置の分解斜視図である。
【図２５】本発明の実施の形態８の空間光伝送装置の断面図である。
【図２６】本発明の実施の形態８の空間光伝送装置の断面図である。
【符号の説明】
１ シャーシ、 ２ 送受基板、 ３ 投光素子、 ４ 受光素子、 ５ 送信回路部、 ６ 受信回路部、 ７ メイン基板、 ８ 基板接続ケーブル、 ９ カバー、 １０ 透光板、 １１ 突起部、 １２ 遮光板、 １３ 両面粘着材、 １４ カバー固定ネジ穴、 １５ カバー固定ネジ、 １６ ネジ取り付け部、 １７ 近赤外線吸収部材、 １８ 空孔、 １９ 傾斜部、 ２０段差部、 ２１ ガイドレール、 ２２ 補助透光板、 ２３ 固定部、 ２４ 切り欠き部、 ２５ 返り部、 ２６ 電磁遮蔽板、 ２７ スペーサー、２８ 成型遮光板、 ２９ 受光窓、 ３０ 光誘導部材、 ３１ 位置決め部、 ３２ 光誘導部材固定部、 ３３ 遮光部材、 ３４ ストッパー部、 ３５ 投光基板、 ３６ 受光基板、 ３７ 投光基板接続ケーブル、 ３８ 受光基板接続ケーブル、 ３９ 回転軸、 ４０ 基板支持部、 ４１ 軸受け部、 ４２ 軸溝、 ４３ 面取り部、 ４４ 可動透光板、 ４５ ボス、 ４６ 透光板軸受け部、 ４７ 配向角固定ナット、 ４８ ドームカバー、 １００ 空間光伝送装置、 １０１ レコーダー、 １０２ 端末機器、 １０３ 映像入力信号ケーブル、 １０４ 電源供給ケーブル、 １０５ 制御信号ケーブル、 １０６ カメラユニット、 １０７ カメラ映像ケーブル、 １０８ カメラユニット固定具、 １０９ 端末機器保持台、 １１０ 壁面、 １１１ 天井、 １１２ モニタ画面、１１３ 操作ボタン、 ２０１ 投光素子３の放射強度特性、 ２０２ 受光素子４の受光感度曲線、 ２０３ 透光板１０の透過率曲線、 ２０４ 端末機器１０２側投光素子の放射強度特性、 ２０５ 端末機器１０２側投光素子の他の放射強度特性例、 ２０６ 遮光板１２の透過率曲線、 ２０７ 透光板１０ａの透過率曲線、 ２０８ 透光板１０ｂの透過率曲線、 ２０９ 透光板１０ｃの透過率曲線、 ２１０ 波長ｆ０に対する透過率曲線、 ２１１ 波長ｆ１に対する透過率曲線、 ２１２ 透光板１０の透過率曲線、 ２１３ 補助透光板２２の透過率曲線、 ３０１ 投光素子３の投光指向曲線、 ３０２ 受光素子４の受光指向曲線、 ４０１ 送受信中心軸、 ４０２ 送受信角。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a spatial light transmission device that transmits a signal by using light emitted to a space, and more particularly to a spatial light transmission device that includes both a light projecting element and a light receiving element and that transmits and receives a mutual signal.
[0002]
[Prior art]
A conventional spatial light transmission device is provided with a light-emitting element for canceling self-emission and an adder for receiving near-infrared return light from a light-emitting element, and removing a disturbance component due to self-emission from a received signal. At the location corresponding to the partition inside the near-infrared transmission filter in front of the light emitting element and the light receiving element, a groove having a semicircular cross section is formed along the partition, and the tip end of the partition is in a semicircular cross section in an assembled state. (See, for example, Patent Document 1).
[0003]
Another conventional spatial light transmission device has a light transmitting element and a light receiving element arranged close to each other to integrate a transmission / reception unit, and a mechanism for rotating the transmission / reception unit is provided, so that an area capable of optical communication with an external device is provided. (For example, see Patent Document 2).
[0004]
[Patent Document 1]
JP-A-11-168435 (page 3-6, FIG. 3)
[Patent Document 2]
Japanese Patent Laid-Open Publication No. 2000-201008 (Page 2-3, FIG. 1)
[0005]
[Problems to be solved by the invention]
However, in the conventional spatial light transmission device as described in Patent Document 1, the depth of the semicircular cross-sectional groove is determined according to the thickness of the near-infrared transmitting filter. There has been a problem that the depth is reduced and the effect of suppressing the propagation of light is reduced. In particular, since the contact surface between the groove of the filter and the tip of the partition is located on the front side where the directivity of the light emitting element and the light receiving element is strong, even a small return light becomes a disturbance component and easily reaches the light receiving element. There were challenges.
[0006]
In addition, a light-emitting element for canceling self-emission must be newly provided in addition to the light-receiving element, and a self-emission cancel circuit must be newly provided on the second substrate. This leads to an increase in manufacturing costs and space saving due to an increase in the number of components. There was a problem that could not be achieved.
[0007]
In the conventional spatial light transmission device as described in Patent Document 2, if the entire transmission / reception unit can be freely rotated in accordance with the positional relationship with the terminal device, the orientation state easily changes due to an unexpected erroneous operation. There was a problem of doing it.
[0008]
The present invention has been made in order to solve such a problem, and can prevent return light from its own light emitting element from entering a light receiving element as a disturbance component. It is an object of the present invention to obtain a spatial light transmission device capable of performing stable transmission and reception even when the orientation angles of the light projecting element and the light receiving element are changed in accordance with the positional relationship between them.
[0009]
[Means for Solving the Problems]
The spatial light transmission device of the present invention includes:
A transmitting and receiving substrate on which a light emitting element and a light receiving element are arranged,
A light-transmitting plate that transmits at least a region of light emitted by the light emitting element and light received by the light receiving element,
A protrusion formed on the back surface of the light-transmitting plate,
A light-shielding plate that is fixed to the protrusion in close contact with the back surface of the light-transmitting plate and attenuates light in a light-emitting area of the light-emitting element,
A cover on which the translucent plate is held,
A chassis on which the transmission / reception board is held;
With
By attaching the cover to the chassis, the light shielding plate is disposed between the light emitting element and the light receiving element, and the tip of the light shielding plate is in close contact with the surface of the transmission / reception substrate.
It is characterized by the following.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
FIG. 1 is an exploded perspective view of a spatial light transmission device according to Embodiment 1 of the present invention, and FIGS. 2 and 3 are sectional views thereof. The spatial light transmission device according to the first embodiment includes a chassis 1, a transmitting / receiving board 2, a light projecting element 3, a light receiving element 4, a main board 7, a board connecting cable 8, a cover 9, a light transmitting plate, 10 and a light shielding plate 12.
[0011]
In FIG. 1, a chassis 1 is used to mount and fix the entire apparatus on a wall or the like, and a transmission / reception board 2 is fixed at a specific inclination angle. On the transmitting / receiving board 2, a light emitting element 3 such as an infrared light emitting diode that emits near infrared light and a light receiving element 4 such as a photodiode that converts light into a voltage are mounted. The main board 7 is also fixed to the chassis 1. The main substrate 7 includes a transmission circuit unit (not shown, but denoted by reference numeral “5” in the following description) that outputs a transmission signal to the light emitting element 3, and a receiving circuit to which a reception signal from the light receiving element 4 is input. (Not shown, but denoted by reference numeral “6” in the following description).
[0012]
The transmission / reception board 2 and the main board 7 are connected by a board connection cable 8. The main board 7 has a video input signal cable 103 for inputting a video signal from an external recorder 101 (see FIG. 4), a power supply cable 104 for supplying power, and a control signal for controlling the recorder 101. The cable 105 is connected.
[0013]
On the other hand, in the cover 9 attached to the front surface of the spatial light transmission device of the first embodiment, an opening is formed at one corner from the lower front surface to the bottom surface, and only light of a specific wavelength such as near infrared rays is formed there. A light-transmitting plate 10 formed of a material such as an acrylic resin that transmits light is mounted.
[0014]
As shown in FIGS. 2 and 3, on the back side of the light-transmitting plate 10, a projection is provided on a portion located between the light-emitting element 3 and the light-receiving element 4 when the cover 9 and the chassis 1 are fitted. 11 is molded. A light-shielding plate 12 for blocking light of a specific wavelength is fixed to a surface of the projection 11 facing the light emitting element 3 with a double-sided adhesive 13.
[0015]
A cover fixing screw hole 14 is provided in the cover 9, and the cover fixing screw 15 is passed through the cover fixing screw hole 14 in a state where the cover 9 is fitted to the chassis 1, and provided at four positions on the chassis 1 side. The cover 9 is attached to the chassis 1 by being coupled to the screw attachment portion 16 thus provided.
[0016]
FIG. 4 is a perspective view of a transmission system configured using the spatial light transmission device according to the first embodiment of the present invention. The system shown in FIG. 4 includes a remote controller 101 for recording an image captured by the camera unit 106 and a terminal device 102 for controlling the recorder 101 and monitoring the image to remotely control captured image signals and various control signals. This is an example of a monitoring system in which spatial transmission and reception are relayed by the spatial light transmission device 100 according to the first embodiment, and transmission of a signal between the spatial light transmission device 100 and the terminal device 102 by light emitted into space. Is made.
[0017]
Next, the operation of the entire system constituted by the spatial light transmission device 100 of the first embodiment will be described with reference to FIG. A composite video signal imaged by a camera unit 106 separately installed in the room is connected to a recorder 101 in an energized state installed on a ceiling 111 of a room where the spatial light transmission device 100 is installed by a camera video cable 107. , And the recording and reproduction of the video signal of the captured image are possible. Further, power is supplied from the recorder 101 to the main board 7 via a power supply cable 104, and the power is distributed to each unit such as the transmission circuit unit 5 and the reception circuit unit 6.
[0018]
After being recorded by the recorder 101, the reproduced video signal is input to the main board 7 via the video input signal cable 103 and transmitted to the transmission circuit unit 5. In the transmission circuit section 5, this input video signal is FM-modulated, and the modulated signal is supplied to the light projecting element 3 of the transmission / reception board 2 via the board connection cable 8, converted into near-infrared rays and emitted to space.
[0019]
On the other hand, the near infrared rays emitted from the light projecting element 3 are directed to the light projecting element 3 and the light receiving element 4 of the spatial light transmission device 100 by being installed on the system operator or the terminal device holding stand 109. After being received by the light receiving element of the device 102 and converted into an electric signal, it is demodulated into a video signal and displayed on the monitor screen 112. Therefore, by confirming the video on the terminal device 102 by the operator, the status of the video reproduced or recorded by the recorder 101 can be grasped.
[0020]
When an operation command for the recorder 101 is input from the operation button 113 provided on the terminal device 102, command data is generated, amplitude-modulated, converted to near-infrared light by the light emitting element of the terminal device 102, and emitted to space. This is received by the light receiving element 4 of the spatial light transmission device 100 and converted into an electric signal. Then, the received signal is sent to the main board 7 by the board connecting cable 8, the command data is restored by the receiving circuit section 6, and sent to the recorder 101 by the control signal cable 105. When the recorder 101 receives the command, the operation is executed. Is done.
[0021]
FIG. 5A is an optical characteristic diagram of the light emitting element 3 and the light emitting element of the terminal device 102, and FIG. 5B is an optical characteristic diagram of the light receiving element 4. In FIG. 5A, 201 indicates the radiation intensity characteristic of the light emitting element 3, and 204 and 205 indicate the radiation intensity characteristics of the light emitting element of the terminal device 102, respectively. FIG. 6A is a diagram illustrating the radiation directivity of the light emitting element 3, and FIG. 6B is a diagram illustrating the light receiving directivity of the light receiving element 4. FIG. 7 is an optical characteristic diagram of the light transmitting plate 10 and the light shielding plate 12. Reference numeral 203 in FIG. 7 indicates a transmittance curve indicating the light transmittance of the light transmitting plate 10, and reference numeral 206 in FIG. 7 indicates a transmittance curve of the light shielding plate 12.
[0022]
Next, the transmission operation when the cover 9 is mounted on the chassis 1 will be described optically with reference to FIGS. The near-infrared light emitted by the light emitting element 3 has a radiation intensity characteristic 201 having a peak at the wavelength f0 shown in FIG. 5A, and further as shown in a light emitting directivity curve 301 shown in FIG. It is radiated with the directional characteristic which becomes the maximum radiation intensity in the direction of the radiation center axis. The light projecting elements 3 are mounted such that the radiation center axis is perpendicular to the transmission / reception board 2, and a plurality of light projecting elements 3 are mounted so as to obtain a stronger radiation intensity.
[0023]
In addition, a light-to-voltage conversion element such as a photodiode is used as a light receiving element of the terminal device 102 that receives near-infrared rays emitted from the light projecting element 3, and an element capable of obtaining the maximum light receiving sensitivity at the wavelength f0 is selected. It is arranged.
[0024]
On the other hand, the light receiving element 4 is a general-purpose light receiving element having high sensitivity light receiving characteristics over a wide range of wavelengths including the wavelength f0, such as a light receiving sensitivity curve 202 shown in FIG. In this way, by allowing the light receiving element 4 to receive a plurality of near infrared rays having different wavelengths with high sensitivity, the wavelength of the near infrared ray emitted by the light emitting element is given a selectivity.
[0025]
For example, if the emission wavelength of the light emitting element on the side of the terminal device 102 (see FIG. 4) is included in a range that is equal to or more than a specific light receiving sensitivity on the light receiving sensitivity curve 202, the radiation intensity characteristic shown in FIG. There is no large difference in light receiving characteristics between the case where the wavelength f1 is selected as in 204 and the case where another wavelength f2 is selected as in the radiation intensity characteristic 205 shown in FIG. If the radiation intensity and the signal processing after receiving light are the same, operations from a plurality of terminal devices 102 emitting near-infrared rays having different wavelengths can be accepted.
[0026]
The directivity of the light receiving element 4 has a maximum sensitivity in the direction of the light receiving central axis as shown by a light receiving directivity curve 302 shown in FIG. 6B, but the relative position is increased so that the operation position of the terminal device 102 has a high degree of freedom. The light-receiving element 4 is mounted such that its light-receiving central axis is perpendicular to the transmitting / receiving substrate 2.
[0027]
On the other hand, the light-transmitting plate 10 has characteristics such as a transmittance curve 203 shown in FIG. 7 and has a near infrared ray having a peak wavelength at the wavelength f0 radiated from the light projecting element 3 or the terminal device 102. Has a property of transmitting near-infrared light having a peak wavelength at the wavelength f1 emitted from the light projecting element, and absorbing and not transmitting light having a shorter wavelength, for example, visible light. As described above, the light transmitting plate 10 is configured to transmit near infrared rays emitted from the light emitting element 3 and near infrared rays emitted from the light emitting element of the terminal device 102 set according to the light receiving wavelength f1 of the light receiving element 4. Both have the property of being efficiently separated from other disturbance light such as visible light and transmitted efficiently.
[0028]
The light-shielding plate 12 has characteristics such as a transmittance curve 206 shown in FIG. 7, and is formed of a material such as an acrylic resin having a characteristic of obtaining a large attenuation with respect to light in a specific wavelength region. . As described above, unlike the light-transmitting plate 10, the light-shielding plate 12 has such a characteristic that light in the near-infrared region having a peak at the wavelength f0 emitted from the light projecting element 3 is attenuated and not transmitted.
[0029]
As shown in FIGS. 2 and 3, the light shielding plate 12 is molded according to the shape of the rear surface of the light transmitting plate 10 so that the portion facing the light transmitting plate 10 is in close contact with the rear surface of the light transmitting plate 10. Further, the tip of the cover 9 is formed in a shape corresponding to the mounting angle of the transmission / reception board 2 to the chassis 1 so that the cover 9 adheres to the transmission / reception board 2 when the cover 9 is attached to the chassis 1. Then, the light shielding plate 12 is brought into close contact with the back surface of the light transmitting plate 10, and the side of the projection 11 facing the light emitting element 3 (hereinafter, referred to as the following) so that the tip on the transmission / reception substrate 2 side protrudes from the projection 11. , The light emitting room side) with a double-sided adhesive 13.
[0030]
The light-transmitting plate 10 with the light-shielding plate 12 attached thereto is attached to the opening of the cover 9 and the cover 9 is attached on the chassis 1 so that the main substrate 7 and the transmitting / receiving substrate 2 are covered, A light-shielding plate 12 fixed to the projection 11 is inserted between the light-emitting element 3 and the light-receiving element 4 on the transmission / reception substrate 2, and the cover 9 is fixed to the chassis 1 with cover fixing screws 15, so that the cover 9 is attached to the chassis 1. The tip of the light shielding plate 12 is in close contact with the transmission / reception substrate 2. As a result, the space defined by the cover 9, the light transmitting plate 10, the chassis 1, and the transmitting / receiving substrate 2 is divided by the light shielding plate 12 into the light emitting chamber where the light emitting element 3 is arranged and the light receiving element 4. It is separated into a light receiving room, which is an installation space.
[0031]
In this state, near-infrared rays emitted from the light emitting element 3 enter from the back side of the light transmitting plate 10 and are emitted from the opposite surface, but near infrared rays reflected in the light emitting chamber are reflected by the light shielding plate 12. The light is attenuated, and the intrusion of the protrusion 11 into the side facing the light receiving element 4 (hereinafter referred to as the light receiving chamber side) is suppressed.
[0032]
As described above, according to the first embodiment, the light-shielding plate 12 molded according to the shape of the rear surface of the light-transmitting plate 10 is placed on the light-transmitting chamber side of the projection 11 integrally molded with the light-transmitting plate 10. By being fixed so as to be in close contact with the back surface of the light plate 10, it is possible to prevent intrusion of near-infrared light emitted from the light projecting element 3 toward the light receiving chamber.
[0033]
In the first embodiment, the transmission circuit unit 5 transmits a signal of the frequency modulation system and the reception circuit unit 6 receives a signal of the amplitude modulation system. Is also good. In this case, it is desirable to use different modulation and demodulation methods for both to reduce interference between transmitted and received signals in a spatial transmission path outside the light transmitting plate 10.
[0034]
As shown in FIG. 8A, a near-infrared absorbing member 17 that absorbs light in the near-infrared region is applied or adhered to the surface of the light-shielding plate 12 or the portion of the transmitting / receiving substrate 2 facing the light-emitting chamber. May be attached. In this case, it is possible to suppress the intensity of unnecessary irregularly reflected light in the light projecting chamber and the near infrared rays radiated to the light shielding plate 12, and to suppress the invasion of near infrared rays into the light receiving chamber side.
[0035]
Further, as shown in FIG. 8B, a hole 18 may be provided between the light projecting element 3 and the light receiving element 4 in the transmitting / receiving substrate 2, and the tip of the light-shielding plate 12 may penetrate the hole. . In this case, it is possible to prevent near-infrared rays from entering the light-receiving chamber from the light-emitting chamber due to a variation in the fitting force between the cover 9 and the chassis 1.
[0036]
Further, in the first embodiment, the light transmitting plate 10 and the light shielding plate 12 are both formed of an acrylic resin material. However, if predetermined spectral characteristics and light shielding characteristics can be satisfied, different materials such as a glass member and a metal member are used. There may be. In this case, weather resistance can be improved by selecting a material according to the installation environment.
[0037]
Further, in the first embodiment, the double-sided adhesive 13 is used for fixing the light-shielding plate 12 to the protruding portion 11, but may be fixed using a weather-resistant curable adhesive. In this case, it is possible to minimize the decrease in the fixing force over time.
[0038]
Embodiment 2 FIG.
FIG. 9 is a sectional view of the spatial light transmission device according to the second embodiment of the present invention. It should be noted that the spatial light transmission device according to the second embodiment shown in FIG. 9 is mainly different from the spatial light transmission device according to the first embodiment shown in FIGS. 11 is provided with a guide rail 21 and the shape of the back surface of the light transmitting plate 10. The optical characteristics of the light projecting element 3, the light receiving element 4, and the light transmitting plate 10 and other configurations such as the terminal device 102 are described below. Since the configuration is the same as that of the first embodiment, common portions are denoted by the same reference numerals, description thereof is omitted, and different points will be mainly described.
[0039]
In FIG. 9, an inclined portion 19 that is inclined in an L-shape toward the light projecting chamber side is provided at the tip end of the light shielding plate 12 facing the back side of the light transmitting panel 10, and A step portion 20 is formed on the back surface. A guide rail 21 is formed on the projection room side of the projection 11, and the light shielding plate 12 is inserted along the guide rail 21 from the tip end of the inclined portion 19, and the projection 11 and the light transmitting plate are formed. It is held along 10.
[0040]
When the light-shielding plate 12 is inserted into the guide rail 21, the light-shielding plate 12 itself is restored when the inclined portion 19 protrudes from the guide rail 21 while the inclined portion 19 is pushed out. The force returns to the original L-shaped inclined state. When the insertion is further performed, the inclined portion 19 stops in a state where the tip of the inclined portion 19 abuts the step portion 20 on the back surface of the light transmitting plate 10. At this time, a part of the light shielding plate 12 protrudes from the tip of the protrusion 11.
[0041]
Next, by attaching the cover 9 on the chassis 1, the light shielding plate 12 locked to the guide rail 21 of the projection 11 is inserted between the light emitting element 3 and the light receiving element 4 of the transmitting / receiving board 2, The portion protruding from the portion 11 is pressed against the surface of the transmitting / receiving substrate 2, so that the light shielding plate 12 moves in the direction of the light transmitting plate 10 along the guide rail 21, and the degree of adhesion of the inclined portion 19 to the step portion 20. That is, the degree of adhesion of the light shielding plate 12 to the light transmitting plate 10 increases.
[0042]
When the light-shielding plate 12 is pressed against both the light-transmitting plate 10 and the transmitting / receiving substrate 2, the angle of the bent portion of the inclined portion 19 is deformed by the elasticity of the light-shielding plate 12 itself, and the variation in the pressing force of the cover 9 is reduced. It is absorbed and the adhesion is maintained. Then, by fixing the cover fixing screws 15 to the four screw mounting portions 16 of the chassis 1 from the cover fixing screw holes 14, the adhesion is further enhanced.
[0043]
As described above, according to the second embodiment, the inclined portion 19 is provided on the light shielding plate 12 so that the light shielding plate 12 is pushed out toward the light transmitting plate 10 along the guide rail 21 when the cover 9 and the chassis 1 are fitted. By doing so, the degree of adhesion of the light-shielding plate 12 to the light-transmitting plate 10 is improved, intrusion of near-infrared rays from the light-emitting room side to the light-receiving room side can be effectively prevented, and stable transmission and reception can be performed. .
[0044]
In the second embodiment, the light shielding plate 12 may be fixed with an adhesive or the like while being pressed against the light transmitting plate 10 at a constant pressure. In this case, by applying sufficient pressure so that the inclined portion 19 is in close contact with the light transmitting plate 10, even if the contact force between the transmitting / receiving substrate 2 and the light shielding plate 12 is weak, the light shielding state on the rear surface of the light transmitting plate 10 is reduced. Can be held.
[0045]
Further, the inclined portions 19 of the light shielding plate 12 may be provided on both the light transmitting plate 10 side and the transmitting / receiving substrate 2 side. In this case, variations in pressure applied to both the light transmitting plate 10 and the transmitting / receiving substrate 2 are absorbed, and more stable light shielding properties are obtained.
[0046]
Further, as shown in FIG. 10, the light shielding plate 12 may have a shape surrounding both surfaces of the projection 11. In this case, since the entire projection 11 is covered with the light shielding plate 12, near-infrared rays that enter the interior of the projection 11 and radiate to the light receiving chamber side can be shielded at the same time, thereby further improving the light-shielding property of near-infrared rays. Can be.
[0047]
Embodiment 3 FIG.
FIG. 11 is a sectional view of the spatial light transmission device according to the third embodiment of the present invention. The spatial light transmission device according to the third embodiment shown in FIG. 11 is mainly different from the spatial light transmission device according to the first embodiment shown in FIGS. Since other configurations such as the light projecting element 3, the light receiving element 4, and the terminal device 102 are the same as those in the first embodiment, the same reference numerals are given to the common parts and the description thereof will be omitted. Are omitted, and different points are mainly described.
[0048]
As shown in FIG. 11, in a state where the cover 9 is fitted to the chassis 1, the distal end of the projection 11 is formed to have a protruding amount until reaching the surface of the transmission / reception board 2, and From the joint between the plate 10 and the protrusion 11 to the entire protrusion, the light-transmitting plate 10a in the light-emitting-room-side region, the light-transmitting plate 10b in the light-receiving-room region, and the protrusion in which the transmittance of near-infrared light is continuously changed. Each part of the light transmitting plate 10c in the partial region is integrally molded.
[0049]
FIG. 12 is an optical characteristic diagram of the light transmitting plate 10 and the protrusions 11 thereof. In FIG. 12A, reference numeral 207 denotes a transmittance curve indicating the light transmittance of the light transmitting plate 10a in the light emitting chamber side region, 208 denotes a transmittance curve of the light transmitting plate 10b in the light receiving chamber side region, and 209. Indicates the transmittance curve of the light-transmitting plate 10c in the region of the protrusion 11 and the joint portion with the protrusion 11, respectively. FIG. 12B shows the relationship between the position of each region as viewed from the front of the light transmitting plate 10 and the transmittance for light of a specific wavelength, and 210 in FIG. Reference numeral 211 denotes a transmittance curve for near-infrared light of the wavelength f0 emitted from the element 3, and 211 denotes a transmittance curve for near-infrared light of the wavelength f1 emitted from the light emitting element on the terminal device 102 side.
[0050]
Next, a transmission operation in a state where the cover 9 is mounted on the chassis 1 will be described. The near-infrared ray of wavelength f0 emitted from the light emitting element 3 is transmitted through the light transmitting plate 10a in the light emitting room side region having the characteristic of the transmittance curve 207 shown in FIG. Efficient light reception is achieved by providing an element having high light sensitivity at the wavelength f0 as the light receiving element on the side of FIG. 4).
[0051]
Of the near-infrared rays of wavelength f0 emitted from the light projecting element 3, those emitted in a direction deviating from the center axis of the radiation are reflected by the partition walls in the light projecting chamber and transmitted at various incident angles. The light penetrates into the light plate 10a and is transmitted to the space on the front side of the light transmission plate 10a, but a part of the light propagates while reflecting inside the light transmission plate 10a.
[0052]
In this case, the infrared light traveling in the direction of the light transmitting plate 10b in the light receiving chamber side region is transmitted through a light transmitting portion 210 on the way due to a change in the transmittance like the characteristic of the transmittance curve 210 shown in FIG. It attenuates as it approaches the plate 10c and is eventually shielded.
[0053]
Further, even when the light enters the projection 11 directly from the light emitting element 3, the light is not transmitted through the space on the opposite light receiving chamber side.
[0054]
In the light-transmitting plate 10b in the light-receiving-room-side region, the transmittance is low with respect to the near-infrared light having the wavelength f0. Is reflected on an object in the outside world, and is incident on the light-transmitting plate 10b in front of the light-transmitting plate 10b.
[0055]
On the other hand, in the light-transmitting plate 10b in the light-receiving-room-side region having the characteristic of the transmittance curve 208 shown in FIG. Near infrared rays emitted from the optical element can reach the light receiving element 4 in the light receiving chamber.
[0056]
Even when the light receiving element 4 has a wide light receiving characteristic capable of receiving light at both the wavelengths f0 and f1, the light transmission in the light receiving chamber side region is adjusted to the wavelength f1 of the infrared light emitted by the light emitting element on the terminal device 102 side. Only by selecting the spectral characteristic of the plate 10b and changing the combination of attachment to the cover 9, near-infrared light having the wavelength f0 from the light-emitting room side and the outside world can have the characteristic of the transmittance curve 210 shown in FIG. Such a change in transmittance prevents the light from reaching the light receiving element 4.
[0057]
Conversely, near-infrared light having the wavelength f1 from the terminal device 102 can reach the light receiving element 4 due to a change in transmittance as shown by the characteristic of the transmittance curve 211 shown in FIG. The relative ratio of the radiation intensity at the wavelength f0 to the wavelength f1 on the light receiving surface of the element 4 is increased, and the malfunction of the light receiving element 4 due to the near infrared ray having the wavelength f0 is suppressed.
[0058]
As described above, according to the third embodiment, even when the light receiving element 4 itself has a specific light receiving characteristic, the projecting portions on the light transmitting chamber side and the light receiving chamber side of the light transmitting plate 10 and between them. By configuring the region to have different transmittances according to the emission wavelengths of the light emitting element 3 and the light emitting element of the terminal device 102, the light receiving characteristics of the light receiving element 4 itself can be supplemented, and the terminal device 102 side Disturbance light due to the combination of the two wavelengths of the light emitting element and the light emitting element 3 is attenuated, and good light reception becomes possible.
[0059]
Further, since the light-transmitting plate 10 is integrally formed of materials having different transmission characteristics in the light-transmitting room region 10a, the light-receiving room region 10b, and the protruding portion region 10c, no steps or gaps are formed on the surface of the light-transmitting plate 10. Therefore, it is possible to prevent the optical characteristics of the light transmitting plate 10 from deteriorating due to intrusion and accumulation of dust, and it is possible to improve workability when the light transmitting plate 10 is incorporated into the cover 9.
[0060]
Embodiment 4 FIG.
FIG. 13 is a sectional view of the spatial light transmission device according to the fourth embodiment of the present invention. The spatial light transmission device of the fourth embodiment shown in FIG. 13 is different from the spatial light transmission device of the first embodiment shown in FIGS. The point where the light plate 22 is provided is an optical characteristic of the light transmitting plate 10, and other configurations such as the light emitting element 3, the light receiving element 4, and the terminal device 102 are the same as those in the first embodiment. The same reference numerals are given to the common parts, the description thereof will be omitted, and different points will be mainly described.
[0061]
In FIG. 13, an auxiliary light transmitting plate 22 formed by using a material such as an acrylic resin is provided with a fixing portion 23 provided at a front end portion of the auxiliary light transmitting plate 22 in a notch 24 on the transmission / reception substrate 2. The return portion 25 at the end of the light receiving element 2 is fitted and locked to the transmission / reception substrate 2, and is disposed so as to cover the entire light receiving element 4 up to the surface of the transmission / reception substrate 2.
[0062]
FIG. 14 is an optical characteristic diagram of the light transmitting plate 10 and the auxiliary light transmitting plate 22. In FIG. 14, reference numeral 212 denotes a transmittance curve of the light transmitting plate 10 at the wavelength f0, and reference numeral 213 denotes a transmittance curve of the auxiliary light transmitting plate 22 at the wavelength f0.
[0063]
First, the attachment state of the auxiliary light transmitting plate 22 to the transmission / reception substrate 2 will be described. The fixing portion 23 provided at the end portion of the auxiliary light transmitting plate 22 on the side of the transmission / reception substrate 2 is slightly inwardly deformed by applying a pressing force inward from the side surface portion of the auxiliary light transmitting plate 22 to release the pressing force. Then, the original position is restored by the elasticity of the material. In a state where a pressing force is applied to the fixing portion 23 of the auxiliary light transmitting plate 22, the auxiliary light transmitting plate 22 is inserted into the cutout portion 24 of the transmitting / receiving substrate 2 and then released by releasing the pressing force, thereby being locked to the transmitting / receiving substrate 2 and freely. It is possible to attach and detach.
[0064]
Next, a transmission operation in a state where the cover 9 is mounted on the chassis 1 will be described. The light transmitting plate 10 having the characteristic of the transmittance curve 212 shown in FIG. 14 has both the near-infrared light of the wavelength f0 radiated from the light projecting element 3 and the near-infrared light of the wavelength f1 radiated from the light projecting element of the terminal device 102. Is high for light of the wavelength Therefore, the near-infrared ray having the wavelength f0 is transmitted to the front side from the rear side of the light transmitting chamber of the light transmitting plate 10 and received by the receiving unit of the terminal device 102 (see FIG. 2) having a high light receiving sensitivity to the wavelength f0. You.
[0065]
Further, near-infrared light of the wavelength f1 emitted from the light emitting element of the terminal device 102 is transmitted from the front side of the light transmitting plate 10 into the light receiving chamber, and is transmitted to the surface of the auxiliary light transmitting plate 22 facing the light transmitting plate 10. Then, the light reaches the inside of the auxiliary light transmitting plate 22. At this time, due to the spectral characteristics of the auxiliary light transmitting plate 22 having the characteristics of the transmittance curve 213 shown in FIG. 14, the components near the wavelength f0 are attenuated and are not transmitted to the inner surface facing the light receiving element 4. The component near the wavelength f1 is transmitted and transmitted to the inside facing the light receiving element 4, and reaches the light receiving surface of the light receiving element 4.
[0066]
Accordingly, the near-infrared ray near the wavelength f0 in the light receiving element 4 is extremely smaller than the radiation intensity of the near-infrared ray having the wavelength f1 emitted from the light emitting element of the terminal device 102, and as a result, the light receiving surface of the light receiving element 4 The relative ratio between the radiation intensity of the wavelength f0 and the radiation intensity of the wavelength f1 is increased, and the malfunction of the light receiving element 4 due to the near infrared ray of the wavelength f0 is suppressed.
[0067]
The near-infrared light that enters the light-emitting chamber from the light-transmitting plate 10 and is irregularly reflected on the inner wall in the light-emitting chamber and the surface of the transmitting / receiving substrate 2 also reaches the side surface of the auxiliary light-transmitting plate 22. 22 is attached to the transmitting / receiving substrate 4 so as to cover the entire light receiving element 4, the near infrared rays near the wavelength f0 are attenuated, and the near infrared rays near the wavelength f1 are attenuated even for the near infrared rays arriving from these directions. Is transmitted.
[0068]
Therefore, even in the case of near-infrared rays reaching the light receiving surface from a direction largely deviated from the light receiving central axis of the light receiving element 4, the radiation intensity near the wavelength f0 is extremely smaller than the radiation intensity near the wavelength f1.
[0069]
When the light receiving sensitivity of the light receiving element 4 itself to the wavelength f0 is extremely small with respect to the wavelength f1, the auxiliary light transmitting plate 22 can be easily removed by the above-described mounting structure of the auxiliary light transmitting plate 22. .
[0070]
As described above, according to the fourth embodiment, the light-transmitting plate 10 formed of a material having a common spectral characteristic is disposed on both the light-emitting chamber side and the light-receiving chamber side, and the light-emitting element 3 and the terminal device 102 are arranged. Even when the light-receiving element 4 having a high light-receiving sensitivity to near-infrared rays emitted from each element of the light-emitting element on the side of the terminal device 102, the spectral characteristics matching the wavelength of the light-emitting element on the side of the terminal device 102 are used. By making the light-transmitting plate 22 and detachable from the transmission / reception substrate 2, the versatility of the light-transmitting plate 10 and the light-receiving element 4 is improved, thereby reducing parts and manufacturing costs.
[0071]
Further, since the auxiliary light transmitting plate 22 is detachable by removing the fixing portion 23 and the return portion 25 from the cutout portion 24 of the transmission / reception board 2, the auxiliary light transmitting device 22 of the terminal device 102 has an auxiliary characteristic matched to the optical characteristics of the light emitting element. The spectral characteristics of the light transmitting plate 22 can be selected, and fine adjustment for obtaining better light receiving characteristics can be easily performed.
[0072]
In the fourth embodiment, the fixing portion 23 of the auxiliary translucent plate 22 is locked on the transmitting / receiving substrate 2, but the fixing portion 23 may be locked on the main body of the light receiving element 4. . In this case, by reducing the size of the auxiliary light transmitting plate 22 to a necessary minimum, not only the cost of the material can be reduced, but also the notch 24 on the transmission / reception substrate 2 becomes unnecessary, so that the area in which components can be arranged. And the space on the substrate can be effectively used.
[0073]
Further, as shown in FIG. 15, an electromagnetic shielding plate 26 having a specific potential between the auxiliary light transmitting plate 22 and the light receiving surface of the light receiving element 4 and having an opening only in front of the light receiving surface may be arranged. . In this case, even if the area of the transmitting and receiving substrate 2 is small and the arrangement of the light projecting element 3 and the light receiving element 4 is close, the influence on the light receiving element 4 due to high frequency electromagnetic noise generated from the light projecting element 3 can be reduced. In particular, even when an element incorporating an electric signal amplifier circuit is used as the light receiving element 4, it is possible not only to prevent the inflow of high-frequency electromagnetic noise, but also to transmit near infrared rays having a wavelength of f0 into the light receiving chamber. Since the light does not reach the surface of the electromagnetic shielding plate 26 due to the transmittance curve 213 of the plate 22, the generation of irregularly reflected light in the light receiving chamber due to the reflection of near infrared rays on the surface of the electromagnetic shielding plate 26 can be reduced. Stable light reception can be performed on the light receiving surface.
[0074]
The spatial light transmission device of the fourth embodiment has the auxiliary light transmitting plate 22 provided in the spatial light transmission device of the first embodiment. However, the spatial light transmission device of the second embodiment has an auxiliary light transmission plate. It is also possible to provide a light transmitting plate 22.
[0075]
Embodiment 5 FIG.
FIG. 16 is a sectional view of the spatial light transmission device according to the fifth embodiment of the present invention. The main difference between the spatial light transmission device of the fifth embodiment shown in FIG. 16 and the spatial light transmission device of the first embodiment shown in FIGS. A point that a near-infrared absorbing member 17 is provided instead of the light-receiving element 11 and the light-shielding plate 12, a spacer 27 and a molded light-shielding plate 28 are provided on the transmission / reception substrate 2. Since other configurations of the terminal device 102 and the like are the same as those of the first embodiment, common portions are denoted by the same reference numerals, description thereof will be omitted, and different points will be mainly described.
[0076]
In FIG. 16, the light projecting element 3 and the light receiving element 4 are fixed to the transmission / reception substrate 2 via a spacer 27 molded of a material having a low transmittance for light having a wavelength in the near infrared region. Between the light emitting element 3 and the light receiving element 4 of the spacer 27, a molded light shielding plate 28 is integrally molded. The near-infrared absorbing member 17 is attached to a portion of the rear surface of the light-transmitting plate 10 facing the molded light-shielding plate 28 so as to be wider than the front end surface of the molded light-shielding plate 28.
[0077]
Next, a transmission operation in a state where the cover 9 is mounted on the chassis 1 will be described. As shown in FIG. 16, when the cover 9 is attached to the chassis 1, a gap is formed between the tip of the molded light shielding plate 28 protruding from the spacer 27 and the near-infrared absorbing member 17 attached to the back surface of the light transmitting plate 10. Occurs. The width of this gap is in a state where it can be changed due to variation in the fitting force between the cover 9 and the chassis 1.
[0078]
Near-infrared light of wavelength f0 emitted in a direction deviating from the emission center axis of the light projecting element 3 enters the light transmitting plate 10 while reflecting the inner wall of the light receiving chamber, is transmitted to the front side of the light transmitting plate 10, and is transmitted to the outside. And is received by the terminal device 102 (see FIG. 4). A part of the light is reflected by the back surface of the light transmitting plate 10 and returns to the light emitting chamber. In this case, at a portion facing the molded light shielding plate 28 that separates the light emitting chamber and the light receiving chamber, reflected light reaching the near infrared absorbing member 17 attached to the back side of the light transmitting plate 10 is absorbed. No secondary reflected light that enters the light receiving chamber through the light source is generated, and near-infrared light near the gap is suppressed from being reflected.
[0079]
As described above, according to the fifth embodiment, the near-infrared absorbing member 17 is fixed to the back side of the light transmitting plate 10 facing the molded light shielding plate 28 disposed between the light projecting chamber and the light receiving chamber, so that the cover 9 Even if the size of the gap changes due to the fitting state of the chassis 1 and the variation thereof, it is possible to suppress the intrusion of near-infrared light having the wavelength f0 from the light projecting chamber side that reaches from the front of the light receiving element 4. Of the near infrared ray having the wavelength f1 can be improved.
[0080]
The outer peripheral portions of both ends of the near-infrared absorbing member 17 on the light emitting chamber side and the light receiving chamber side have the radiation directivity of the light emitting element 3 and the light receiving directivity of the light receiving element 4 as shown in FIG. Accordingly, by making a shape that is cut away, the blind spot of transmission and reception by the near-infrared ray absorbing member 17 can be minimized, and the near-infrared ray emitted from the light emitting element 3 is effectively absorbed. Good transmission and reception directional characteristics can be obtained. It should be noted that it is also possible to make only the outer peripheral portion of the near-infrared absorbing member 17 on the light emitting chamber side or the light receiving chamber side into a shape that is cut away.
[0081]
When the near-infrared absorbing member 17 is fixed not only to the back side of the light-transmitting plate 10 but also to the leading end surface of the opposing molded light shielding plate 28 as shown in FIG. And the near-infrared ray is absorbed by each near-infrared ray absorbing member 17, so that the intrusion of near-infrared ray of wavelength f0 into the light receiving chamber side can be further suppressed.
[0082]
Further, as shown in FIG. 17 (c), the near-infrared absorbing member 17 attached to the tip of the molded light shielding plate 28 is formed in a U-shape and fixed so as to cover from the distal end portion to the side wall portion of the molded light shielding plate 28. Unnecessary irregular reflection components of near-infrared light on the surface of the light-shielding room of the molded light-shielding plate 28 can be relatively suppressed, and even when the thickness of the molded light-shielding plate 28 is small, the near-infrared absorbing member 17 can be held. Stabilization and improvement in workability during assembly can be achieved.
[0083]
Embodiment 6 FIG.
FIG. 18 is a sectional view of the spatial light transmission device according to the sixth embodiment of the present invention. The spatial light transmission device according to the sixth embodiment shown in FIG. 18 mainly differs from the spatial light transmission device according to the first embodiment shown in FIGS. The point that the guide member 30 is provided, and other configurations such as the light projecting element 3, the light receiving element 4, and the terminal device 102 are the same as those in the first embodiment. The description is omitted, and different points are mainly described.
[0084]
In FIG. 18, a light receiving window 29 is provided in a portion facing the light receiving element 4 on the light receiving chamber side of the light transmitting plate 10. Then, the light guide member 30 is inserted so as to penetrate through the light receiving window 29, and the positioning portion 31 provided on the side surface of the light guide member 30 is fitted to the light guide member fixing portion 32 on the back surface of the light transmitting plate 10. Are fixed together. Further, a light shielding member 33 is applied to the entire outer periphery of the light guide member 30 including a portion facing the inner wall of the light transmitting plate 10 forming the light receiving window 29.
[0085]
The light guiding member 30 is formed of a material such as an acrylic resin that attenuates only the near-infrared region near the wavelength f0 emitted by the light emitting element 3 with respect to light in the near-infrared region. The light guide member 30 transmits near-infrared rays having a wavelength within a receivable range of the light-receiving element 4 including near-infrared rays centered on the wavelength f1 radiated from the light emitting elements of the terminal device 102 (see FIG. 4). Have the property to do. As an example of this characteristic, it has the same optical characteristic as the transmittance curve 213 of the auxiliary light transmitting plate 22 shown in FIG. 14 of the fourth embodiment.
[0086]
Next, the shape of the light guiding member 30 and the state of attachment to the light transmitting plate 10 will be described. One end of the light guiding member 30 is inserted into the light receiving window 29 from the back side of the light transmitting plate 10, and the positioning portion 31 formed on the outer peripheral portion is applied to the rear surface of the light transmitting plate 10, and at the same time, the light guiding member fixing portion 32 is It is fixed by entering the back side of the positioning part 31 and fitting. Further, the light guiding member 30 is pulled out from the side of the light transmitting plate 10 to release the fitting, so that the light guiding member 30 can be freely removed.
[0087]
The end face of the light guide member 30 on the side inserted into the light receiving window 29 has the same flat shape as the shape of the surface of the light transmitting plate 10. The opposite surface has a larger diameter than the light receiving surface of the light receiving element 4 and is formed into a concave shape.
[0088]
Next, a transmission operation in a state where the cover 9 is mounted on the chassis 1 will be described. By tightening the cover 9 with the cover fixing screw 15 after attaching the cover 9 to the chassis 1, the fitting force between the cover 9 and the chassis 1 increases, and the distal end portion of the outer periphery of the concave portion of the light guide member 30 is fixed to the transmission / reception substrate 2 in close contact. Is done. At this time, the concave portion of the light guiding member 30 is disposed directly above the light receiving surface of the light receiving element 4 (a position facing the light receiving surface), and the entire light receiving element 4 is covered by the light guiding member 30. .
[0089]
If the near-infrared ray of the wavelength f1 radiated from the light-emitting element on the terminal device 102 side is selected within the range of the wavelength at which the maximum light-receiving sensitivity of the light-receiving element 4 can be obtained, the near-infrared ray is received in the light-receiving window of the light transmitting plate 10. When the light reaches the distal end surface of the light guiding member 30 in the inside 29, only near-infrared rays near the wavelength f1 are transmitted due to the spectral characteristics of the light guiding member 30 near the distal end surface, and enter while receiving the light while reflecting the inside. The light arrives at the concave portion at the front end on the indoor side, and is emitted from directly above the light receiving surface of the light receiving element 4 and reaches the light receiving element 4.
[0090]
For example, disturbance light, such as near-infrared light having a wavelength of f0, which is emitted from the light projecting element 3 in the light projecting chamber, is reflected by an external object, and returns, propagates through the light guiding member 30 while being dispersed. The light intensity is attenuated by the characteristics, and the light intensity at the time when the light reaches the light receiving surface of the light receiving element 4 is extremely smaller than the near infrared light of the wavelength f1 which has reached from the terminal device 102 side.
[0091]
When the light transmitting plate 10 is close to the light projecting element 3 and the light receiving element 4, a part of the near infrared rays emitted from the light projecting element 3 propagates inside the light transmitting plate 10, and It is emitted from the inner surface of the light receiving window 29 on the side. The near-infrared ray that has entered the light receiving chamber from the gap between the light guiding member 30 and the inner surface of the light receiving window 29 is prevented from entering the inside of the light guiding member 30 by the light shielding member 33 on the surface of the light guiding member 30. Since the guide member 30 covers the entire light receiving element 4, the light reaching the light receiving element 4 in the light receiving chamber is also prevented.
[0092]
As described above, according to the sixth embodiment, the light guide member 30 having specific spectral characteristics and surrounded by the light blocking member 33 is fixed inside the light receiving window 29 provided in the light transmitting plate 10, so that the light receiving element 4 can be connected to the light receiving element 4. In this case, the near-infrared rays from the light projecting element 3 can be prevented from reaching and the accuracy of receiving the near-infrared rays from the terminal device 102 can be improved, and the influence of the light shielding plate 12 on the light receiving directivity of the light receiving element 4 can be reduced. A good light receiving characteristic is obtained.
[0093]
As shown in FIG. 19A, the end surface of the light guide member 30 on the light receiving window 29 side is made to protrude from the surface of the light transmitting plate 10, and the light from the light emitting element 3 radiated from the surface of the light transmitting plate 10. It is also possible to suppress the near-infrared rays from entering from the front end of the light guide member 30 on the light transmitting plate 10 side. In this case, the light-shielding member 33 is also surrounded by the tip of the light guide member 30 protruding from the light transmitting plate 10 to prevent the near-infrared rays from the light emitting element 3 from entering the side surface of the light guide member 30. desirable.
[0094]
Also, as shown in FIG. 19B, a concave portion 30a is formed at the tip of the light guide member 30 on the side of the light-transmitting plate 10 to supplement the directivity of receiving near-infrared light reaching from the terminal device 102. Is also good. Further, as shown in FIG. 19 (c), a plurality of concave portions 30b may be formed, which can supplement the light receiving directivity of near-infrared rays arriving from the terminal device 102.
[0095]
Although the spatial light transmission device of the sixth embodiment has the light guide member 30 provided in the spatial light transmission device of the first embodiment, the spatial light transmission device of the second embodiment has a light guide member. It is also possible to provide a member 30.
[0096]
Embodiment 7 FIG.
In the first embodiment, in order to fix the transmission / reception board 2 to the housing itself of the chassis 1, the orientation angles of the light projecting element and the light receiving element are fixed at a fixed angle. Then, the mounting angle of the transmitting / receiving substrate 2 is adjusted to the orientation angle of the light emitting element and the light receiving element according to the selection of the cover 9.
[0097]
FIG. 20 is an exploded perspective view of a spatial light transmission device according to Embodiment 7 of the present invention, and FIGS. 21 and 22 are sectional views thereof. FIG. 23 is a diagram illustrating an installation example of the spatial light transmission device according to the seventh embodiment of the present invention. The spatial light transmission device according to the seventh embodiment includes a chassis 1, a light emitting board 35, a light receiving board 36, a light emitting element 3, a light receiving element 4, a main board 7, a light emitting board connecting cable 37, , A light-receiving substrate connection cable 38, a cover 9, a light-transmitting plate 10, a light-shielding plate 12, a rotating shaft 39, and a substrate support 40.
[0098]
The difference between the spatial light transmission device of the seventh embodiment shown in FIGS. 20 to 22 and the spatial light transmission device of the first embodiment shown in FIGS. The light-emitting element 3 and the light-receiving element 36 are divided into a light-emitting substrate 35 and a light-receiving substrate 36, a rotation structure using a rotating shaft 39, a structure of the chassis 1, and a shape of the projection 11 and the light-shielding plate 12. 4 and other configurations such as the optical characteristics of the light-transmitting plate 10 and the terminal device 102 are the same as those in the first embodiment. Therefore, common portions are denoted by the same reference numerals, and description thereof will be omitted, and different points will be described. Will be explained with emphasis.
[0099]
In FIG. 20 or FIG. 21, the light emitting substrate 35 on which the light emitting element 3 is mounted and the light receiving substrate 36 on which the light receiving element 4 is mounted are both fixed to a rotating shaft 39 by a substrate supporting portion 40. It is attached to a bearing 41 provided on the chassis 1 so as to rotate within a certain range.
[0100]
The main board 7 on the chassis 1 is connected to the light emitting board 35 and the light receiving board 36 by a light emitting board connecting cable 37 and a light receiving board connecting cable 38, respectively. The gap is located at a position facing the light shielding plate 12 when the cover 9 is mounted on the chassis 1, and is attached at an interval equal to or greater than the thickness of the light shielding plate 12.
[0101]
A stopper 34 protruding toward the light-emitting chamber is provided at the tip of the projection 11, and a light-shielding plate 12 is fixed to a side surface of the projection 11 on the light-receiving chamber side with a double-sided adhesive 13. .
[0102]
As shown in FIG. 22, the light shielding plate 12 is provided with a shaft groove 42 having a width wider than the diameter of the rotation shaft 39 from the tip of the protrusion 11. The rotation shaft 39 is attached to the cover 9 when attaching the cover 9 to the chassis 1. It is opened in such a shape as to move while penetrating the inside of the shaft groove 42, and a chamfered portion 43 is formed at the tip thereof.
[0103]
The shape of the tip of the projection 11 is formed at an angle determined according to the cover 9. For example, the spatial light transmission device according to the seventh embodiment is installed on a wall 110 as shown in FIG. 23A or horizontally on a ceiling 111 in a room as shown in FIG. When the covers 9a and 9b having different shapes are prepared in advance according to the installation conditions, such as when mounted downward, the light-transmitting plates 10a and 10a in which the protrusions 11 having different tip shapes are formed at different angles. 10b is attached.
[0104]
Next, an operation when the cover 9 is attached to the chassis 1 will be described. When the cover 9 is attached to the chassis 1 so that the chamfered portion 43 of the light shielding plate 12 is located between the light emitting substrate 35 and the light receiving substrate 36, the rotation shaft 39 is inserted along the axial groove 42 of the light shielding plate 12. At this time, since the stopper portion 34 at the tip of the protrusion 11 is pressed while contacting the light receiving substrate 36, the light emitting substrate 35 and the light receiving substrate 36 are rotated by the rotating shaft 39 while maintaining the mutual positional relationship, It is held at the inclination angle of the stopper part 34 according to the tip shape of the projection part 11.
[0105]
Subsequently, the cover 9 is fixed to the four screw mounting portions 16 provided on the side surface of the chassis 1 with the cover fixing screws 15 so that the pressing force of the cover 9 to the chassis 1 is increased, and the cover 9 is moved onto the stopper portion 34 and the light emitting board 35. Is maintained, and the light shielding plate 12 is completely inserted into the gap between the light emitting substrate 35 and the light receiving substrate 36.
[0106]
For example, when the chassis 1 is mounted on the wall surface 110 as shown in FIG. 23 (a), the cover 9a suitable for mounting on the wall surface 110 is used, so that the light is projected downward and in front of the terminal device 102. The light projecting substrate 35 and the light receiving substrate 36 rotate so that the element 3 and the light receiving element 4 are oriented, and the transmission / reception center axis 401a of the light projecting element 3 and the light receiving element 4 is oriented to the transmission / reception unit of the terminal device 102, and the transmission angle Transmission and reception within the range of 402 are possible.
[0107]
Further, when the terminal device 102 is mounted on the ceiling 111 as shown in FIG. 23B, the light emitting element 3 and the light receiving The element 4 is oriented, the transmission / reception center axis 401b is oriented to the terminal device 102, and transmission / reception can be performed within the same transmission / reception angle 402 as when the cover 9a is used.
[0108]
23 (a) and FIG. 23 (b), since the light shielding plate 12 is inserted between the light emitting substrate 35 and the light receiving substrate 36, the orientation angle of each substrate changes. Even so, the intrusion of near-infrared light having the wavelength f0 from the light-emitting room side to the light-receiving room side is prevented.
[0109]
As described above, according to the seventh embodiment, the tip of the protruding portion 11 is formed to have an inclined angle, and the light shielding plate 12 is inserted into the gap between the light projecting substrate 35 and the light receiving substrate 36 in accordance with the angle of inclination. By rotating the light projecting substrate 35 and the light receiving substrate 36, it is possible to prevent disturbance light from entering the light receiving element 4 from the light projecting element 3 and to project light according to the type of the cover 9 and the positional relationship with the terminal device 102. The orientation angle of the optical element 3 and the light receiving element 4 can be easily adjusted, and the workability of adjusting the orientation angle of the light projecting board 35 and the light receiving board 36 performed when the chassis 1 is installed on the ceiling 111 or the wall surface 110. Improvement can be achieved, and an angle adjustment error can be prevented.
[0110]
In the seventh embodiment, it is desirable that the stopper 34 of the protrusion 11 be brought into contact with the outer periphery of the light receiving substrate 36 as far as possible from the rotation shaft 39. In this case, the pressure required when the light emitting substrate 35 and the light receiving substrate 36 rotate around the rotation shaft 39 is reduced, and the pressure applied when the cover 9 is attached to the chassis 1 can be reduced, so that the workability can be further improved. .
[0111]
Further, the stopper portion 34 and the light receiving substrate 36 may be brought into contact with each other at several small contact portions near point contact. In this case, a gap can be ensured between the tip of the protrusion 11 and the surface of the light receiving substrate 36, so that restrictions on component mounting on the light receiving substrate 36 and routing of the copper foil pattern can be relaxed, and the degree of component mounting can be improved. be able to.
[0112]
Embodiment 8 FIG.
In the seventh embodiment, when the cover 9 is attached to the chassis 1, the orientation angle is adjusted while rotating the light-emitting substrate 35 and the light-receiving substrate 36, but in the eighth embodiment described below, This relates to a case where it is necessary to finely adjust the orientation angles of the light projecting substrate 35 and the light receiving substrate 36 before attaching 9 to the chassis 1.
[0113]
FIG. 24 is an exploded perspective view of a spatial light transmission device according to Embodiment 8 of the present invention, and FIGS. 25 and 26 are cross-sectional views thereof. The spatial light transmission device according to the eighth embodiment includes a chassis 1, a light emitting board 35, a light receiving board 36, a light emitting element 3, a light receiving element 4, a main board 7, a light emitting board connecting cable 37, , Light receiving substrate connection cable 38, cover 9, movable light transmitting plate 44, light shielding plate 12, rotating shaft 39, substrate supporting portion 40, orientation angle fixing nut 47, dome cover 48, camera unit 106 And
[0114]
The main difference between the spatial light transmission device shown in FIGS. 24 to 26 and the spatial light transmission device of the seventh embodiment shown in FIGS. 20 to 22 is that the movable light transmitting device is used instead of the light transmitting plate 10. The provision of the plate 44, the provision of the shape cover 9 of the light shielding plate 12 and the structure of the chassis 1, the provision of the orientation angle fixing nut 47, and the provision of the camera unit 106 on the chassis 1. The optical characteristics of the optical element 3, the light receiving element 4, and the light transmitting plate 10 and other configurations such as the terminal device 102 are the same as those in the above-described seventh embodiment. Are omitted, and different points are mainly described.
[0115]
In FIG. 24, openings are provided at two positions, one on the upper front side and one on the lower front side of the cover 9. A movable light-transmitting plate 44 formed of a material that transmits only infrared light is provided in an opening at the lower part of the front surface, and bosses 45 provided on both left and right sides of the movable light-transmitting plate 44 are provided on both sides of the opening of the cover 9. It is attached by fitting to. Further, the movable light transmitting plate 44 can rotate around a boss 45 within a certain range.
[0116]
A projection 11 is provided on the back side of the movable light transmitting plate 44, a stopper 34 protruding toward the light emitting chamber is provided at the tip thereof, and the light shielding plate 12 is provided on both sides on the light receiving chamber side. It is fixed with an adhesive 13.
[0117]
Further, the light projecting board 35 on which the light projecting element 3 is mounted and the light receiving board 36 on which the light receiving element 4 is mounted are both fixed to a rotating shaft 39 by a substrate supporting portion 40 and furthermore, the chassis is movable around the rotating shaft 39. 1 and fixed at an arbitrary angle by tightening an orientation angle fixing nut 47.
[0118]
Further, a camera unit 106 is mounted on the chassis 1. The direction of the camera unit 106 can be freely adjusted within a certain range in the up, down, left, and right directions on the chassis 1, and an imaged video signal from the camera unit 106 is transmitted to the recorder 101 (see FIG. 4).
[0119]
A dome cover 48 molded of acrylic resin or the like is provided at an upper position on the front of the cover 9 such that the dome cover 48 is disposed on the front of the camera unit 106 with the cover 9 attached to the chassis 1. The image is taken by the camera unit 106 through the dome cover 48.
[0120]
Next, an operation when the cover 9 is attached to the chassis 1 will be described. After the chassis 1 is mounted on a wall or the like, the light projecting substrate 35 and the light receiving substrate 36 are rotated by the rotation shaft 39 without the cover 9 being attached to the chassis 1, and the light projecting element 3 and the light receiving element 4 are connected to the terminal device 102 ( The angle is adjusted to an optimum value according to the arrangement of FIG. 23), and the orientation angle fixing nut 47 is tightened and fixed.
[0121]
At the same time, the direction of the camera unit 106 is adjusted so as to be directed in an optimal direction. In this case, the directions of the light emitting element 3 and the light receiving element 4 have already been adjusted according to the position of the terminal device 102, and the video signal output from the recorder 101 is transmitted to the transmission circuit unit 5 (not shown) of the main board 7. , The imaging state of the camera unit 106 is displayed on the monitor screen of the terminal device 102. The adjuster adjusts the orientation of the camera unit 106 while checking this image.
[0122]
After the directions of the light emitting board 35 and the light receiving board 36 and the camera unit 106 are adjusted, the light shielding plate 12 is inserted between the light emitting board 35 and the light receiving board 36 by attaching the cover 9 to the chassis 1. The rotating shaft 39 is inserted into the shaft groove 42. At this time, the stopper portion 34 of the projection 11 is pressed against the surface of the light projecting substrate 35, and the movable light transmitting plate 44 rotates according to the inclination angle of the light projecting substrate 35, and according to the tip shape of the projection 11. It is held according to the inclination angle of the stopper portion 34.
[0123]
Subsequently, the cover 9 is fixed to the four screw mounting portions 16 provided on the side surface of the chassis 1 with the cover fixing screws 15, so that the pressing force of the cover 9 to the chassis 1 increases, and the cover 9 is moved onto the stopper portion 34 and the light emitting board 35. Is kept in close contact.
[0124]
As described above, according to the eighth embodiment, the tip of the projection 11 is inclined, and the light-transmitting plate 12 is inserted into the gap between the light-emitting substrate 35 and the light-receiving substrate 36 in accordance with the inclination angle. By automatically orienting the light-shielding plate 44 and the light-shielding plate 12, it is possible to maintain the shielding of disturbance light from the light-emitting element 3 to the light-receiving element 4 while maintaining the optimal direction according to the inclination of the light-emitting substrate 35 and the light-receiving substrate 36. The movable light transmitting plate 44 can be oriented.
[0125]
In addition, the movable light transmitting plate 44 and the projection 11 can be mounted on the light projecting substrate 35 and the light receiving substrate 36 whose orientation angles are variously adjusted according to the mounting position on the wall surface of the chassis 1 and the positional relationship of the terminal device 102. The shape and structure of the stopper portion 34 and the light shielding plate 4 can be made common, and the manufacturing cost can be reduced.
[0126]
Furthermore, since the orientation angle can be adjusted only when the cover 9 is removed from the chassis 1 when adjusting the direction of the camera unit 106, etc., the erroneous operation of the movable translucent plate 44 in the normal installation state with the cover 9 attached is prevented. You can also.
[0127]
In each of the above embodiments, the case where six light emitting elements 3 are used has been illustrated and described. However, the number of light emitting elements 3 is not limited to this, and the number of light emitting elements 3 is not limited to one. It goes without saying that there may be individual ones.
[0128]
【The invention's effect】
As described above, according to the present invention, a light-shielding plate molded in accordance with the shape of the rear surface of the light-transmitting plate is arranged on the side facing the light-receiving element of the projection integrally molded with the light-transmitting plate, and When the cover is fixed to the rear surface of the light-transmitting plate, the cover can be adhered to the rear surface of the light-transmitting plate when the cover is fixed to the chassis. There is an effect that infrared rays can be efficiently prevented from entering the light receiving element as a disturbance component, and stable transmission and reception can be performed even when the orientation angle between the light emitting element and the light receiving element is changed.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a spatial light transmission device according to a first embodiment of the present invention.
FIG. 2 is a sectional view of the spatial light transmission device according to the first embodiment of the present invention.
FIG. 3 is a sectional view of the spatial light transmission device according to the first embodiment of the present invention.
FIG. 4 is a perspective view of a transmission system configured using the spatial light transmission device according to the first embodiment of the present invention.
FIG. 5 is an optical characteristic diagram of a light projecting element and a light receiving element in the spatial light transmission device according to the first embodiment of the present invention.
FIG. 6 is a diagram showing radiation directivity of a light projecting element and light receiving directivity of a light receiving element in the spatial light transmission device according to the first embodiment of the present invention.
FIG. 7 is an optical characteristic diagram of a light transmitting plate and a light shielding plate in the spatial light transmission device according to the first embodiment of the present invention.
FIG. 8 is a sectional view of another spatial light transmission device according to the first embodiment of the present invention.
FIG. 9 is a sectional view of a spatial light transmission device according to a second embodiment of the present invention.
FIG. 10 is a sectional view of another spatial light transmission device according to the second embodiment of the present invention.
FIG. 11 is a sectional view of a spatial light transmission device according to a third embodiment of the present invention.
FIG. 12 is an optical characteristic diagram of a light transmitting plate and its projections in the spatial light transmission device according to the third embodiment of the present invention.
FIG. 13 is a sectional view of a spatial light transmission device according to a fourth embodiment of the present invention.
FIG. 14 is an optical characteristic diagram of a light transmitting plate and an auxiliary light transmitting plate in a spatial light transmission device according to a fourth embodiment of the present invention.
FIG. 15 is a sectional view of another spatial light transmission device according to the fourth embodiment of the present invention.
FIG. 16 is a sectional view of a spatial light transmission device according to a fifth embodiment of the present invention.
FIG. 17 is a diagram showing another spatial light transmission device according to the fifth embodiment of the present invention.
FIG. 18 is a sectional view of a spatial light transmission device according to a sixth embodiment of the present invention.
FIG. 19 is a sectional view showing the vicinity of a light guiding member in another spatial light transmission device according to the sixth embodiment of the present invention.
FIG. 20 is an exploded perspective view of a spatial light transmission device according to a seventh embodiment of the present invention.
FIG. 21 is a sectional view of a spatial light transmission device according to a seventh embodiment of the present invention.
FIG. 22 is a sectional view of a spatial light transmission device according to a seventh embodiment of the present invention.
FIG. 23 is a diagram illustrating an installation example of a spatial light transmission device according to a seventh embodiment of the present invention.
FIG. 24 is an exploded perspective view of a spatial light transmission device according to an eighth embodiment of the present invention.
FIG. 25 is a sectional view of a spatial light transmission device according to an eighth embodiment of the present invention.
FIG. 26 is a sectional view of a spatial light transmission device according to an eighth embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Chassis, 2 Transmitting / receiving board, 3 Light emitting element, 4 Light receiving element, 5 Transmitting circuit section, 6 Receiving circuit section, 7 Main board, 8 Board connection cable, 9 Cover, 10 Translucent plate, 11 Projection section, 12 Shield plate , 13 double-sided adhesive material, 14 cover fixing screw hole, 15 cover fixing screw, 16 screw mounting part, 17 near infrared ray absorbing member, 18 void, 19 inclined part, 20 stepped part, 21 guide rail, 22 auxiliary translucent plate, 23 fixing portion, 24 cutout portion, 25 return portion, 26 electromagnetic shielding plate, 27 spacer, 28 molded light shielding plate, 29 light receiving window, 30 light guiding member, 31 positioning portion, 32 light guiding member fixing portion, 33 light shielding member, 34 stopper part, 35 light emitting board, 36 light receiving board, 37 light emitting board connecting cable, 38 light receiving board connecting cable, 39 rotation axis, 40 board support , 41 bearing portion, 42 shaft groove, 43 chamfered portion, 44 movable light transmitting plate, 45 boss, 46 light transmitting plate bearing portion, 47 orientation angle fixing nut, 48 dome cover, 100 spatial light transmission device, 101 recorder, 102 terminal Equipment, 103 video input signal cable, 104 power supply cable, 105 control signal cable, 106 camera unit, 107 camera video cable, 108 camera unit fixture, 109 terminal device holder, 110 wall surface, 111 ceiling, 112 monitor screen, 113 Operation buttons, 201 radiation intensity characteristic of light emitting element 3, 202 light receiving sensitivity curve of light receiving element 4, 203 transmittance curve of light transmitting plate 10, 204 radiation intensity characteristic of light emitting element on terminal device 102 side, 205 terminal device 102 side Example of other radiation intensity characteristics of the light emitting element, Transmittance curve, 207 transmittance curve of light-transmitting plate 10a, 208 transmittance curve of light-transmitting plate 10b, 209 transmittance curve of light-transmitting plate 10c, 210 transmittance curve for wavelength f0, 211 transmittance curve for wavelength f1, 212 213 transmittance curve of the light transmitting plate 10, 213 transmittance curve of the auxiliary light transmitting plate 22, 301 light emitting directivity curve of the light emitting element 3, 302 light receiving directivity curve of the light receiving element 4, 401 transmission / reception central axis, 402 transmission / reception angle.

Claims (19)

投光素子および受光素子が配設された送受基板と、
少なくとも前記投光素子の発光する光および前記受光素子で受光される光の領域を透過する透光板と、
前記透光板の裏面に形成された突起部と、
前記透光板の裏面に密着して前記突起部に固定され、前記投光素子の発光領域の光を減衰させる遮光板と、
前記透光板が保持されるカバーと、
前記送受基板が保持されるシャーシと
を備え、
前記カバーを前記シャーシに取り付けることにより、前記遮光板が前記投光素子と前記受光素子の間に配置され、前記遮光板の先端部が前記送受基板の表面に密着する
ことを特徴とする空間光伝送装置。A transmitting and receiving substrate on which a light emitting element and a light receiving element are arranged,
A light-transmitting plate that transmits at least a region of light emitted by the light emitting element and light received by the light receiving element,
A protrusion formed on the back surface of the light-transmitting plate,
A light-shielding plate that is fixed to the protrusion in close contact with the back surface of the light-transmitting plate and attenuates light in a light-emitting area of the light-emitting element,
A cover on which the translucent plate is held,
A chassis on which the transmission / reception board is held,
By attaching the cover to the chassis, the light-shielding plate is disposed between the light-emitting element and the light-receiving element, and a front end of the light-shielding plate is in close contact with the surface of the transmitting and receiving substrate. Transmission equipment. 前記遮光板が、前記透光板の裏面の形状および前記送受基板の配向角度に応じた形状に成型されていることを特徴とする請求項１記載の空間光伝送装置。2. The spatial light transmission device according to claim 1, wherein the light shielding plate is formed into a shape corresponding to a shape of a back surface of the light transmitting plate and an orientation angle of the transmission / reception substrate. 前記遮光板が、前記突起部の前記投光素子に面した側のみに固定されていることを特徴とする請求項１または２に記載の空間光伝送装置。The spatial light transmission device according to claim 1, wherein the light shielding plate is fixed only to a side of the projection that faces the light emitting element. 前記投光素子に対向する前記送受基板および前記遮光板の表面に、前記投光素子の発光する光を吸収する光吸収部材を設けたことを特徴とする請求項１から３までのいずれかに記載の空間光伝送装置。4. A light absorbing member for absorbing light emitted from the light emitting element is provided on a surface of the transmitting / receiving substrate and the light shielding plate facing the light emitting element. The spatial light transmission device according to claim 1. 前記送受基板に形成された空孔をさらに備え、
前記カバーを前記シャーシに取り付けることにより、前記遮光板の先端部が前記空孔を貫通する
ことを特徴とする請求項１から４までのいずれかに記載の空間光伝送装置。Further comprising a hole formed in the transmitting and receiving substrate,
The spatial light transmission device according to any one of claims 1 to 4, wherein when the cover is attached to the chassis, a tip portion of the light shielding plate penetrates the hole. 投光素子および受光素子が配設された送受基板と、
少なくとも前記投光素子の発光する光および前記受光素子で受光される光の領域を透過する透光板と、
前記透光板の裏面に形成された段差部と、
前記透光板の裏面に形成された突起部と、
前記突起部に形成されたガイドレールと、
前記ガイドレールに保持され、前記投光素子の発光領域の光を減衰させる遮光板と、
前記遮光板に形成され、前記段差部に密着する傾斜部と、
前記透光板が保持されるカバーと、
前記送受基板が保持されるシャーシと
を備え、
前記カバーを前記シャーシに取り付けることにより、前記遮光板が前記投光素子と前記受光素子の間に配置され、前記遮光板の先端部が前記送受基板の表面に密着する
ことを特徴とする空間光伝送装置。A transmitting and receiving substrate on which a light emitting element and a light receiving element are arranged,
A light-transmitting plate that transmits at least a region of light emitted by the light emitting element and light received by the light receiving element,
A step formed on the back surface of the light-transmitting plate,
A protrusion formed on the back surface of the light-transmitting plate,
A guide rail formed on the protrusion,
A light-shielding plate held by the guide rail and attenuating light in a light-emitting area of the light-emitting element,
An inclined portion formed on the light-shielding plate and in close contact with the step portion;
A cover on which the translucent plate is held,
A chassis on which the transmission / reception board is held,
By attaching the cover to the chassis, the light-shielding plate is disposed between the light-emitting element and the light-receiving element, and a front end of the light-shielding plate is in close contact with the surface of the transmitting and receiving substrate. Transmission equipment. 前記ガイドレールが突起部の両面に設けられ、前記透光板が前記突起部の両面に保持されていることを特徴とする請求項６記載の空間光伝送装置。The spatial light transmission device according to claim 6, wherein the guide rails are provided on both surfaces of the protrusion, and the light transmitting plate is held on both surfaces of the protrusion. 投光素子および受光素子が配設された送受基板と、
少なくとも前記投光素子の発光する光を透過する第１の領域、少なくとも前記受光素子で受光される光を透過する第２の領域、および前記投光素子の発光領域の光を減衰させる第３の領域を含む透光板と、
前記透光板の前記第３の領域の裏面に形成され、前記投光素子の発光領域の光を減衰させる突起部と、
前記透光板が保持されるカバーと、
前記送受基板が保持されるシャーシと
を備え、
前記カバーを前記シャーシに取り付けることにより、前記突起部が前記投光素子と前記受光素子の間に配置され、前記突起部の先端部が前記送受基板の表面に密着する
ことを特徴とする空間光伝送装置。A transmitting and receiving substrate on which a light emitting element and a light receiving element are arranged,
At least a first area for transmitting light emitted by the light emitting element, a second area for transmitting at least light received by the light receiving element, and a third area for attenuating light in the light emitting area of the light emitting element. A light-transmitting plate including an area;
A projection formed on the back surface of the third region of the light transmitting plate and attenuating light in a light emitting region of the light emitting element;
A cover on which the translucent plate is held,
A chassis on which the transmission / reception board is held,
By attaching the cover to the chassis, the projection is disposed between the light emitting element and the light receiving element, and the tip of the projection is in close contact with the surface of the transmission / reception substrate. Transmission equipment. 前記透光板とは異なる光透過率特性の補助透光板と、
前記補助透光板に設けられた固定部と、
前記送受基板上の前記受光素子の周囲に設けられた切り欠き部と
をさらに備え、
前記固定部を前記切り欠き部に嵌合することにより、前記補助透光板が前記送受基板上に着脱可能に保持されている
ことを特徴とする請求項１から７までのいずれかに記載の空間光伝送装置。An auxiliary light-transmitting plate having a light transmittance characteristic different from that of the light-transmitting plate,
A fixing portion provided on the auxiliary light transmitting plate,
A notch provided around the light receiving element on the transmission / reception substrate,
The said auxiliary | assistant translucent plate is hold | maintained so that attachment or detachment is possible by fitting the said fixing | fixed part to the said notch part, The transmission / reception board | substrate is characterized by the above-mentioned. Spatial light transmission equipment. 前記受光素子と前記補助透光板の間の空間に、電磁遮蔽板が挿入されていることを特徴とする請求項９記載の空間光伝送装置。The spatial light transmission device according to claim 9, wherein an electromagnetic shielding plate is inserted in a space between the light receiving element and the auxiliary light transmitting plate. 投光素子および受光素子がスペーサーを介して配設された送受基板と、
前記スペーサー上の前記投光素子と前記受光素子の間に形成され、前記投光素子が発光する光を減衰させる成形遮光板と、
少なくとも前記投光素子の発光する光および前記受光素子で受光される光の領域を透過する透光板と、
前記透光板の裏面に配置され、前記投光素子の発光する光を吸収する光吸収部材と、
前記透光板が保持されるカバーと、
前記送受基板が保持されるシャーシと
を備え、
前記カバーを前記シャーシに取り付けることにより、前記光吸収部材が前記成形遮光板の先端面に対向する位置に配置される
ことを特徴とする空間光伝送装置。A transmitting and receiving substrate on which a light emitting element and a light receiving element are arranged via a spacer,
A molded light shielding plate formed between the light emitting element and the light receiving element on the spacer and attenuating light emitted by the light emitting element,
A light-transmitting plate that transmits at least a region of light emitted by the light emitting element and light received by the light receiving element,
A light absorbing member that is arranged on the back surface of the light transmitting plate and absorbs light emitted by the light emitting element;
A cover on which the translucent plate is held,
A chassis on which the transmission / reception board is held,
The spatial light transmission device according to claim 1, wherein the cover is attached to the chassis so that the light absorbing member is disposed at a position facing a tip end surface of the molded light shielding plate. 前記光吸収部材の前記投光素子側または／および前記受光素子側の外周部が、前記投光素子の放射指向性または／および前記受光素子の受光指向性に応じて抉り取られた形状であることを特徴とする請求項１１記載の空間光伝送装置。An outer peripheral portion of the light absorbing member on the light projecting element side and / or the light receiving element side has a shape cut out according to the radiation directivity of the light projecting element and / or the light receiving directivity of the light receiving element. The spatial light transmission device according to claim 11, wherein: 前記成型遮光板の先端面にも、前記投光素子の発光する光を吸収する光吸収部材が設けられていることを特徴とする請求項１１または１２に記載の空間光伝送装置。13. The spatial light transmission device according to claim 11, wherein a light absorbing member that absorbs light emitted from the light projecting element is also provided on a front end surface of the molded light shielding plate. 前記成型遮光板の先端面に設けられた前記光吸収部材は、前記成型遮光板の前記受光素子側および前記投光素子側の両面で固定されていることを特徴とする請求項１３記載の空間光伝送装置。14. The space according to claim 13, wherein the light absorbing member provided on a tip end surface of the molded light shielding plate is fixed on both surfaces of the molded light shielding plate on the light receiving element side and the light emitting element side. Optical transmission device. 前記透光板に形成された受光窓と、
前記透光板に形成された光誘導部材固定部と、
前記受光窓に一端が挿入され、前記光誘導部材固定部に嵌合して、前記透光板に着脱可能に保持される光誘導部材と
をさらに備え、
前記カバーを前記シャーシに取り付けることにより、前記光誘導部材が前記受光素子全体を覆うように配置される
ことを特徴とする請求項１から７までのいずれかに記載の空間光伝送装置。A light receiving window formed in the light transmitting plate,
A light guiding member fixing portion formed on the light transmitting plate,
A light guiding member, one end of which is inserted into the light receiving window, which is fitted to the light guiding member fixing portion, and which is detachably held by the light transmitting plate;
The spatial light transmission device according to any one of claims 1 to 7, wherein the light guide member is disposed so as to cover the entire light receiving element by attaching the cover to the chassis. 前記光誘導部材の前記受光窓側の端面を前記透光板の表面よりも突出させたことを特徴とする請求項１５項記載の空間光伝送装置。16. The spatial light transmission device according to claim 15, wherein an end face of the light guide member on the light receiving window side protrudes from a surface of the light transmitting plate. 前記光誘導部材の前記受光窓側の端面に、１つまたは複数の凹面形状部を設けたことを特徴とする請求項１５または１６に項記載の空間光伝送装置。17. The spatial light transmission device according to claim 15, wherein one or a plurality of concave portions are provided on an end surface of the light guide member on the light receiving window side. 投光素子が配設された投光基板と、
受光素子が配設された受光基板と、
少なくとも前記投光素子の発光する光および前記受光素子で受光される光の領域を透過する透光板と、
前記透光板の裏面に形成された突起部と、
前記突起部の先端に形成されたストッパー部と、
前記透光板の裏面に密着して前記突起部に固定され、前記投光素子の発光領域の光を減衰させる遮光板と、
前記遮光板に形成された軸溝と、
前記透光板が保持されるカバーと、
前記投光基板および前記受光基板が固定された回転軸と、
前記回転軸が回転可能に保持されるシャーシと
を備え、
前記カバーを前記シャーシに取り付けることにより、前記遮光板が前記投光基板と前記受光基板の間に配置され、前記軸溝内に前記回転軸が配置され、前記ストッパー部が前記投光基板または前記受光基板に密着することによって前記投光基板および前記受光基板の配向角度が保持される
ことを特徴とする空間光伝送装置。A light emitting substrate on which the light emitting element is disposed,
A light receiving substrate on which the light receiving element is disposed,
A light-transmitting plate that transmits at least a region of light emitted by the light emitting element and light received by the light receiving element,
A protrusion formed on the back surface of the light-transmitting plate,
A stopper formed at the tip of the protrusion,
A light-shielding plate that is fixed to the protrusion in close contact with the back surface of the light-transmitting plate and attenuates light in a light-emitting area of the light-emitting element,
An axial groove formed in the light shielding plate,
A cover on which the translucent plate is held,
A rotating shaft to which the light emitting substrate and the light receiving substrate are fixed,
A chassis on which the rotating shaft is rotatably held,
By attaching the cover to the chassis, the light-shielding plate is disposed between the light-emitting substrate and the light-receiving substrate, the rotating shaft is disposed in the shaft groove, and the stopper portion is the light-emitting substrate or the light-emitting substrate. A spatial light transmission device wherein the orientation angles of the light projecting substrate and the light receiving substrate are maintained by being in close contact with the light receiving substrate. 投光素子が配設された投光基板と、
受光素子が配設された受光基板と、
少なくとも前記投光素子の発光する光および前記受光素子で受光される光の領域を透過する可動透光板と、
前記可動透光板の裏面に形成された突起部と、
前記突起部の先端に形成されたストッパー部と、
前記可動透光板の裏面に密着して前記突起部に固定され、前記投光素子の発光領域の光を減衰させる遮光板と、
前記遮光板に形成された軸溝と、
前記可動透光板が半可動状態で保持されるカバーと、
前記投光基板および前記受光基板が固定された回転軸と、
前記回転軸が回転可能に保持されるシャーシと、
前記シャーシに設けられ、前記回転軸の回転を固定する固定機構と
を備え、
前記回転軸の固定後に前記カバーを前記シャーシに取り付けることにより、前記遮光板が前記投光基板と前記受光基板の間に配置され、前記遮光板の軸溝内に前記回転軸が配置され、前記ストッパー部が前記投光基板または前記受光基板に密着することによって前記可動透光板の配向角度が保持される
ことを特徴とする空間光伝送装置。A light emitting substrate on which the light emitting element is disposed,
A light receiving substrate on which the light receiving element is disposed,
A movable light transmitting plate that transmits at least light emitted from the light emitting element and an area of light received by the light receiving element,
A protrusion formed on the back surface of the movable light transmitting plate,
A stopper formed at the tip of the protrusion,
A light-shielding plate that is fixed to the protrusion in close contact with the back surface of the movable light-transmitting plate and attenuates light in a light-emitting area of the light-emitting element;
An axial groove formed in the light shielding plate,
A cover in which the movable light-transmitting plate is held in a semi-movable state,
A rotating shaft to which the light emitting substrate and the light receiving substrate are fixed,
A chassis on which the rotating shaft is rotatably held;
A fixing mechanism provided on the chassis, for fixing rotation of the rotating shaft,
By attaching the cover to the chassis after fixing the rotating shaft, the light shielding plate is arranged between the light emitting substrate and the light receiving substrate, and the rotating shaft is arranged in an axial groove of the light shielding plate, The spatial light transmission device, wherein an orientation angle of the movable light transmitting plate is maintained by a stopper part being in close contact with the light projecting substrate or the light receiving substrate.
JP2003142860A 2003-05-21 2003-05-21 Spatial optical transmission equipment Expired - Fee Related JP4279047B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003142860A JP4279047B2 (en) 2003-05-21 2003-05-21 Spatial optical transmission equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003142860A JP4279047B2 (en) 2003-05-21 2003-05-21 Spatial optical transmission equipment

Publications (2)

Publication Number Publication Date
JP2004349905A true JP2004349905A (en) 2004-12-09
JP4279047B2 JP4279047B2 (en) 2009-06-17

Family

ID=33530802

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2003142860A Expired - Fee Related JP4279047B2 (en) 2003-05-21 2003-05-21 Spatial optical transmission equipment

Country Status (1)

Country Link
JP (1) JP4279047B2 (en)

Also Published As

Publication number Publication date
JP4279047B2 (en) 2009-06-17

Similar Documents

Publication Publication Date Title
US6359712B1 (en) Bidirectional optical communication apparatus and optical remote control apparatus
US20150215508A1 (en) Imaging apparatus
JPH07335917A (en) Light receiving unit
JP2018164190A (en) Imaging apparatus
JP4279047B2 (en) Spatial optical transmission equipment
US7244922B2 (en) Semiconductor device and electronic apparatus
EP1732248B1 (en) Infrared communication unit for relaying between a main unit and a terminal unit
JP2018173434A (en) Imaging device
JP2023083330A (en) camera
JP2018164189A (en) Imaging apparatus
JP2001094124A (en) Photoreception structure in electronic apparatus
JP5991256B2 (en) Image display light generator assembly of image display device and image display device
JP2004320304A (en) Case structure of remote control light receiving electronic apparatus
JPH09331075A (en) Infrared ray receiver
KR200237443Y1 (en) Structure of preamp
JP2009188491A (en) Goose neck type microphone
JPH08191493A (en) Light receiving device for remote control
JP4189351B2 (en) Infrared receiver
JPH07284178A (en) Remote controller
JP4157852B2 (en) Infrared emitting / receiving device
JP2001177117A (en) Electromagnetic shield structure of photodetecting part
JP3496377B2 (en) Lighting equipment
JPS63172593A (en) Remote operating device for air conditioner
JPS60194676A (en) Video camera
JP4044911B2 (en) Receiver

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20060220

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20080122

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20080129

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20080325

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20081224

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20090209

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20090310

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20090311

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120319

Year of fee payment: 3

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120319

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130319

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130319

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140319

Year of fee payment: 5

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

LAPS Cancellation because of no payment of annual fees