JPH06164825A

JPH06164825A - Optical coupler and optical coupling method

Info

Publication number: JPH06164825A
Application number: JP5136390A
Authority: JP
Inventors: Masayuki Yamamoto; 山本　　政行
Original assignee: Oki Electric Industry Co Ltd
Current assignee: Oki Electric Industry Co Ltd
Priority date: 1993-04-28
Filing date: 1993-04-28
Publication date: 1994-06-10

Abstract

PURPOSE:To make the size of a light emitting and a light receiving section, to reduce the manufacture cost and to simplify the circuit configuration. CONSTITUTION:Drive circuits 35, 37 emit an infrared ray L32 and a red light L33 altrenately from light emitting element arrays 32, 33. A multiplexer circuit 38 selects sequentially the infrared ray L32 or the red light L33 synchronously with the drive circuits 35, 37, a light receiving element array 34 receives the selected light and 1st and 2nd output signals are outputted to a selection circuit 40. The selection circuit 40 selects the 1st or the 2nd output signal sequentially synchronously with the drive circuits 35, 37 and outputs the selected signal to output terminals 43, 44.

Description

【発明の詳細な説明】（産業上の利用分野）本発明は、反射型ホトインタラプ
タ等のように発光素子アレイ及び受光素子アレイを有す
る光結合装置及びその光結合方法に関するものである。（従来の技術）従来、このような分野の技術としては、
例えば第２図に示すようなものがあった。以下、その構
成を図を用いて説明する。第２図は、従来の光結合装置
を示すもので、反射型ホトインタラプタの構成ブロック
図である。この光結合装置は、例えば銀行等における自
動預金支払い機（ＡｕｔｏｍａｔｉｃＴｅｌｌｅｒ’
ｓＭａｃｈｉｎｅ：以下ＡＴＭという）等において、
紙幣等の識別を行うセンサとして用いられるものであ
り、２個の受発光部１，１１を有している。一方の受発
光部１は、赤外光を発光及び受光する機能を有し、赤外
発光用の発光素子アレイ２と、受光素子アレイ３で構成
されている。発光素子アレイ２は、電源電圧Ｖｃｃに接
続されると共に、発光素子アレイ２を駆動するドライブ
回路４に接続され、そのドライブ回路４がクロック回路
５に接続されている。受光素子アレイ３は、電源電圧Ｖ
ｃｃに接続されると共に、受光素子アレイ３を駆動する
マルチプレクサ回路６に接続されて、そのマルチプレク
サ回路６が増幅器７を介して出力端子８に接続されてい
る。他方の受発光部１１は、赤色光を発光及び受光する
機能を有し、赤色発光用の発光素子アレイ１２と、受光
素子アレイ１３で構成されている。発光素子アレイ１２
は、電源電圧Ｖｃｃに接続されると共に、発光素子アレ
イ１２を駆動するドライブ回路１４に接続され、そのド
ライブ回路１４がクロック回路１５に接続されている。
受光素子アレイ１３は、電源電圧Ｖｃｃに接続されると
共に、受光素子アレイ１３を駆動するマルチプレクサ回
路１６に接続され、そのマルチプレクサ回路１６が増幅
器１７を介して出力端子１８に接続されている。第３図
は、第２図中の２個の受発光部１，１１の概略の外観図
である。一方の受発光部１は基板２１を有し、その基板
２１上には、赤外発光用の発光素子２−１，２−２，
…，２−ｎがアレイ状に配列された発光素子アレイ２が
形成されている。発光素子２−１〜２−ｎに隣接して、
受光素子３−１，３−２，…，３−ｎがアレイ状に配列
された受光素子アレイ３が形成されている。これらの発
光素子アレイ２及び受光素子アレイ３は、光路用の透明
窓等が設けられたパッケージ２２内に収納されている。
他方の受発光部１１は基板２３を有し、その基板２３上
には、受発光部１と同様に、赤色発光用の発光素子１２
−１，１２−２，…，１２−ｎからなる発光素子アレイ
１２、受光素子１３−１，１３−２，…，１３−ｎから
なる受光素子アレイ１３とが形成され、パッケージ２４
内に収納されている。以上のように構成される光結合装
置及びその光結合方法の動作を説明する。受発光部１，
１１上に、図示しない送り装置等によって、例えば紙幣
のような複数の色からなる模様が印刷された被測定物２
５を送る。被測定物２５が受発光部１上に送られてくる
と、クロック回路５からのクロック信号に基づき、ドラ
イブ回路４の制御によって発光素子アレイ２から赤外光
Ｌ２が発光され、被測定物２５に照射される。被測定物
２５に照射された赤外光Ｌ２は、その被測定物２５によ
って反射され、反射光Ｌ３になる。この反射光Ｌ３は、
マルチプレクサ回路６で制御される受光素子アレイ３に
よって受光される。反射光Ｌ３の受光によってマルチプ
レクサ回路６は、被測定物２５に印刷された模様のデー
タを示す出力信号を出力するので、その出力信号が増幅
器７を介して出力端子８へ出力される。出力端子８に出
力された出力信号は、図示しないが、次段に接続される
信号処理回路等によって処理され、被測定物２５の模様
が識別される。同様に、被測定物２５が受発光部１１上
に送られてくると、発光素子アレイ１２は、赤色光Ｌ１
２を発光する。この赤色光Ｌ１２が被測定物２５に反射
して反射光Ｌ１３となり、その反射光Ｌ１３が受光素子
アレイ１３によって受光され、受発光部１の場合と同様
に、被測定物２５の色についての識別が行われる。（発明が解決しようとする課題）しかしながら、上記構
成の光結合装置及びその光結合方法では、次のような課
題があった。従来、赤外光用の受発光部１と赤色光用の
受発光部１１とが、それぞれ別個のパッケージ２２，２
４内に収納され、それらのパッケージ２２，２４が間隔
を隔てて配置されている。そのため、受発光部が大型化
すると共に、部材コスト及び組み立てコスト等の製造コ
ストが高くなってしまう。さらに、各受発光部１，１１
毎にマルチプレクサ回路６，１６及び増幅器７，１７を
設けなければならず、その分、回路構成が複雑化すると
いう問題があった。この問題を解決するため、例えば、
受発光部１，１１を同一のパッケージ内に収納すること
で、受発光部の小型化を図ることが考えられる。ところ
が、受発光部１と１１がそれぞれ発光する赤外光Ｌ２と
赤色光Ｌ１２の発光波長は、それぞれの識別対象の相違
によって異なっている。そのため、受発光部１と１１を
同一パッケージ内に収納すると、赤外光Ｌ２、赤色光Ｌ
１２及び反射光Ｌ３，Ｌ１３が相互干渉を起こすおそれ
がある。相互干渉が起きると、受光素子アレイ３，１３
による受光が精度良く行われなくなり、模様及び色の識
別精度が劣化する。この識別精度の劣化を防止するた
め、同一パッケージ内に収納した受発光部１と１１の間
に遮蔽物を設けることも考えられる。しかし、遮蔽物を
設けると、かえって回路規模が大きくなり、製造コスト
がかさんでしまう。又、受発光部１と１１を同一パッケ
ージ内に収納しても、依然として回路構成は複雑であ
る。このように、受発光部１と１１を同一パッケージ内
に収納しても、技術的に十分満足のいく光結合装置及び
光結合方法が得られない。本発明は、前記従来技術が持
っていた課題として、受発光部が大型化する、製造コス
トが高くなる、及び回路構成が複雑になる点について解
決した光結合装置及び光結合方法を提供するものであ
る。（課題を解決するための手段）第１の発明は、前記課題
を解決するために、光結合装置において、第１の発光波
長を有する第１の光を発光する第１の発光素子と、第２
の発光波長を有する第２の光を発光する第２の発光素子
と、第１及び第２の制御信号に応答して前記第１及び第
２の発光素子の出力を順次切換える第１及び第２の回路
と、前記第１及び第２の光を受光する受光素子と、第３
及び第４の回路とを、備えている。第３の回路は、前記
第１及び第２の制御信号に同期した第３の制御信号に応
答して前記第１及び第２の光の受光を順次切換え、かつ
前記第１の光を受光すると第１の出力信号を出力し、前
記第２の光を受光すると第２の出力信号を出力する回路
である。第４の回路は、前記第１及び第２の制御信号に
同期させ、前記第１及び第２の出力信号を順次切換えて
出力端子へ転送する回路である。第２の発明では、光結
合装置において、第１の発光波長を有する第１の光を発
光する第１の発光素子と、第２の発光波長を有する第２
の光を発光する第２の発光素子と、前記第１及び第２の
光を受光する受光素子とを、同一基板上に設けた受発光
素子を備えている。第３の発明では、第２の発明の第１
及び第２の発光素子を、これらから発光される前記第１
及び第２の光を受光する前記受光素子を挟むように配置
している。第４の発明では、第２の発明の第１及び第２
の発光素子を交互に複数個配置し、前記第１及び第２の
発光素子から発光される前記第１及び第２の光を受光す
る前記受光素子を前記第１及び第２の発光素子と対にな
るように配置している。第５の発明では、第１、第２、
第３又は第４の発明において、第１の光として赤外光、
第２の光として赤色光を用いている。第６の発明では、
光結合方法において、第１及び第２の制御信号に応答し
て第１の発光波長を有する第１の光及び第２の発光波長
を有する第２の光を交互に被測定物へ発光し、前記第１
及び第２の制御信号に同期した第３の制御信号に応答し
て前記第１及び第２の光を交互に受光する。そして、前
記第１及び第２の制御信号に同期させ、前記第１及び第
２の光の受光による出力信号を交互に出力端子へ転送す
るようにしている。第７の発明では、光結合方法におい
て、第１の期間で、第１のレベルの第１の制御信号に応
答して、第１の発光素子から第１の発光波長を有する第
１の光を被測定物へ発光すると共に、第１のレベルの第
２の制御信号に応答して、第２の発光素子における第２
の発光波長を有する第２の光の発光を禁止し、次に第２
の期間で、第２のレベルの前記第２の制御信号に応答し
て、前記第２の発光素子から前記被測定物へ前記第２の
光を発光し、第２のレベルの前記第１の制御信号に応答
して、前記第１の発光素子における前記第１の光の発光
を禁止する。前記第１の期間で、前記第１の制御信号に
同期した第１のレベルの第３の制御信号に応答して、前
記第１の光を受光し、この受光により第１の出力信号を
出力し、次に前記第２の期間で、前記第１のレベルの前
記第３の制御信号に応答して、前記第２の光を受光し、
この受光により第２の出力信号を出力する。そして、前
記第１の期間で、前記第１のレベルの前記第１の制御信
号に同期させ、前記第１の出力信号を出力端子へ転送
し、次に前記第２の期間で、前記第１のレベルの前記第
２の制御信号に同期させ、前記第２の出力信号を前記出
力端子へ転送するようにしている。第８の発明では、第
６又は第７の発明において、第１の光として赤外光、第
２の光として赤色光を用いている。（作用）第１の発明によれば、以上のように光結合装
置を構成したので、第１及び第２の回路によって第１と
第２の発光素子から交互に第１の光と第２の光が発光さ
れる。第３の回路では、第１及び第２の回路に同期して
第１と第２の光を順次切換えて受光し、その第１と第２
の出力信号を第４の回路へ出力する。第４の回路では、
第１及び第２の回路と同期して第１及び第２の出力信号
を順次切換えて出力端子へ転送する。第２の発明によれ
ば、第１及び第２の発光素子と受光素子とを同一基板上
に設けた受発光素子は、受発光部の小型化を図る働きが
ある。第３及び第４の発明によれば、第１及び第２の発
光素子と受光素子とを最小面積で同一基板上に形成させ
る働きがある。第５の発明によれば、第１の光として赤
外光、第２の光として赤色光を用いることは、それらの
相互干渉を抑制する働きがある。第６の発明によれば、
第１と第２の制御信号に基づき、第１と第２の光が交互
に被測定物へ照射される。これらの第１と第２の光は、
交互に受光され、それらの出力信号が交互に出力端子へ
転送される。第７の発明によれば、第１の期間で、第１
の発光素子から第１の光が被測定物へ照射され、それが
受光されて第１の出力信号が出力されて出力端子へ転送
される。次に、第２の期間では、第２の発光素子から被
測定物へ第２の光が照射され、それが受光され、第２の
出力信号が出力されて出力端子へ転送される。第８の発
明によれば、第５の発明と同様に、第１の光の赤外光、
及び第２の光の赤色光は、それらの相互干渉を防止する
働きがある。従って、前記課題を解決できるのである。（実施例）第１図は、本発明の実施例の光結合装置を示
すもので、反射型ホトインタラプタの構成ブロック図で
ある。この光結合装置は、例えば銀行等におけるＡＴＭ
等において、紙幣等の識別を行うセンサとして用いられ
るものであり、受発光部３１を有している。受発光部３
１は、２個の発光素子アレイ３２，３３、及び１つの受
光素子アレイ３４を有している。一方の発光素子アレイ
３２は、赤外光Ｌ３２を発光する機能を有し、電源電圧
Ｖｃｃ及びドライブ回路（第１の回路）３５にそれぞれ
接続されている。ドライブ回路３５は、発光素子アレイ
３２をオン・オフ制御するための回路であり、該ドライ
ブ回路３５には、クロック信号（制御信号）発生用のク
ロック回路３６が接続されている。クロック回路３６
は、それぞれ所定のタイミングで、クロック信号（第１
の制御信号）φ１、クロック信号（第２の制御信号）φ
２、クロック信号（第３の制御信号）φ３、及びクロッ
ク信号φ４，φ５をそれぞれ出力する回路である。他方
の発光素子アレイ３３は、赤色光Ｌ３３を発光する機能
を有し、電源電圧Ｖｃｃ及びドライブ回路（第２の回
路）３７にそれぞれ接続されている。ドライブ回路３７
は、発光素子アレイ３３をオン・オフ制御するための回
路であり、該ドライブ回路３７にはクロック回路３６が
接続されている。受光素子アレイ３４は、赤外光Ｌ３２
の反射光Ｌ３２−１、及び赤色光Ｌ３３の反射光Ｌ３３
−１をそれぞれ受光する機能を有し、電源電圧Ｖｃｃ及
びマルチプレクサ回路（第３の回路）３８にそれぞれ接
続されている。マルチプレクサ回路３８は、受光素子ア
レイ３４をオン・オフ制御する回路であり、クロック回
路３６に接続されると共に、該マルチプレクサ回路３８
の出力を増幅する増幅器３９の入力側に接続されてい
る。増幅器３９の出力側は、選択回路（第４の回路）４
０に接続されている。選択回路４０は、増幅器３９で増
幅されたマルチプレクサ回路３８の出力を、反射光Ｌ３
２−１による出力（第１の出力信号）と、反射光Ｌ３３
−１による出力（第２の出力信号）とに選別し、それら
を選択的に出力する回路であり、２つの２入力ＡＮＤゲ
ート４１，４２で構成されている。一方のＡＮＤゲート
４１の入力側は、増幅器３９の出力側及びクロック回路
３６に接続され、該ＡＮＤゲート４１の出力側が、反射
光Ｌ３２−１によるマルチプレクサ回路３８の出力信号
を出力する出力端子４３に接続されている。ＡＮＤゲー
ト４２の入力側は、増幅器３９の出力側及びクロック回
路３６に接続され、該ＡＮＤゲート４２の出力側が、反
射光Ｌ３３−１によるマルチプレクサ回路３８の出力信
号を出力する出力端子４４に接続されている。第４図
は、第１図中の受発光部３１の概略を示す外観図であ
る。この受発光部３１は基板４５を有し、その基板４５
上には、例えば発光ダイオード（以下、ＬＥＤという）
からなる赤外発光用の発光素子３２−１，３２−２，
…，３２−ｎがアレイ状に配列された発光素子アレイ３
２が形成されている。これらの発光素子３２−１〜３２
−ｎに隣接して、例えばＬＥＤからなる赤色発光用の発
光素子３３−１，３３−２，…，３３−ｎがアレイ状に
配列された発光素子アレイ３３が形成されている。さら
に、発光素子３２−１〜３２−ｎと発光素子３３−１〜
３３−ｎとの間には、例えばホトダイオードからなる受
光素子３４−１，３４−２，…，３４−ｎがアレイ状に
配列された受光素子アレイ３４が形成されている。これ
らの発光素子アレイ３２，３３及び受光素子アレイ３４
は、赤外光Ｌ３２、赤色光Ｌ３３及び反射光Ｌ３２−
１，Ｌ３３−１の光路となる透明窓等が設けられたパッ
ケージ４６内に収納されている。第５図は、第１図の光
結合装置の回路図である。一方の発光素子アレイ３２
は、その複数の発光素子３２−１〜３２−ｎのアノード
側が電源電圧Ｖｃｃに共通接続され、そのカソード側が
ドライブ回路３５に接続されている。ドライブ回路３５
は、２個のトランジスタをダーリントン接続して形成さ
れる複数のスイッチ３５−１，３５−２，…，３５−ｎ
と、各スイッチ３５−１〜３５−ｎをクロック信号φ１
に基づきオン・オフ制御するシフトレジスタ３５ａと
で、構成されている。各スイッチ３５−１〜３５−ｎの
コレクタは、発光素子３２−１〜３２−ｎのカソード側
に接続され、エミッタが接地電位ＧＮＤに共通接続さ
れ、ベースがシフトレジスタ３５ａに接続されている。
他方の発光素子アレイ３３は、その複数の発光素子３３
−１〜３３−ｎのアノード側が電源電圧Ｖｃｃに共通接
続され、カソード側がドライブ回路３７に接続されてい
る。ドライブ回路３７は、２個のトランジスタをダーリ
ントン接続して構成される複数のスイッチ３７−１，３
７−２，…，３７−ｎと、各スイッチ３７−１〜３７−
ｎをクロック信号φ２に基づきオン・オフ制御するシフ
トレジスタ３７ａとで、構成されている。各スイッチ３
７−１〜３７−ｎのコレクタは、発光素子３３−１〜３
３−ｎのカソードに、エミッタが接地電位ＧＮＤに、ベ
ースがシフトレジスタ３７ａに、それぞれ接続されてい
る。受光素子アレイ３４は、その複数の受光素子３４−
１〜３４−ｎのカソード側が電源電圧Ｖｃｃに共通接続
され、アノード側がマルチプレクサ回路３８に接続され
ている。マルチプレクサ回路３８は、複数のＮチャネル
型ＭＯＳトランジスタ（以下、ＮＭＯＳという）３８−
１，３８−２，…，３８−ｎと、各ＮＭＯＳ３８−１〜
３８−ｎをクロック信号φ３に基づきオン・オフ制御す
るシフトレジスタ３８ａとで、構成されている。各ＮＭ
ＯＳ３８−１〜３８−ｎのソースは各受光素子３４−１
〜３４−ｎのアノードに、ドレインが増幅器３９に、ゲ
ートがシフトレジスタ３８ａに、サブストレートが接地
電位ＧＮＤに、それぞれ接続されている。以上のように
構成される光結合装置及びその光結合方法の動作を、第
６図を参照しつつ説明する。第６図は、第１図の光結合
装置及びその光結合方法の動作タイミング図である。こ
こで、クロック信号φ１及びφ２は、交互に活性化され
る信号（例えば、ハイレベル又はローレベルになる信
号）である。クロック信号φ３はクロック信号φ１，φ
２に同期した信号、２つのクロック信号φ４，φ５はそ
れぞれクロック信号φ１，φ２に同期した信号である。
受発光部３１上に、図示しない送り装置等によって、例
えば紙幣のような複数の色からなる模様が印刷された被
測定物４７を送る。被測定物４７が受発光部３１上に送
られてくると、第１の期間で、クロック信号φ１がハイ
レベル（以下、“Ｈ”という）になり、クロック信号φ
２がローレベル（以下、“Ｌ”という）、クロツク信号
φ３が“Ｈ”、クロック信号φ４が“Ｈ”、クロック信
号φ５が“Ｌ”になる。クロック信号φ１が第１の期間
で“Ｈ”，第２の期間で“Ｌ”を繰り返して入力される
と、“Ｈ”の時にスイッチ３５−１〜３５−ｎが順次オ
ンする。スイッチ３５−１〜３５−ｎが順次オンする
と、発光素子３２−１〜３２−ｎに順次電流が流れ、そ
れらの発光素子３２−１〜３２−ｎが順次赤外光Ｌ３２
を発光する。クロック信号φ３が“Ｈ”，“Ｌ”を繰り
返して入力されると、“Ｈ”の時に、シフトレジスタ３
８ａはＮＭＯＳ３８−１〜３８−ｎのゲートに順次電圧
を印加するので、それらのＮＭＯＳ３８−１〜３８−ｎ
が順次オンする。ＮＭＯＳ３８−１〜３８−ｎが順次オ
ンすると、受光素子３４−１〜３４−ｎは、順次受光可
能（オン）状態になる。この場合、例えば発光素子３２
−１がオンすると、受光素子３４−１のみがオンし、そ
れ以外の発光及び受光素子はすべてオフしている。次
に、発光素子３２−２がオンすると、受光素子３４−２
のみがオンし、他はすべてオフしている。以下、発光素
子３２−３〜３２−ｎ及び受光素子３４−３〜３４−ｎ
についても同様である。発光素子３２−１〜３２−ｎか
ら順次発光された赤外光Ｌ３２は、被測定物４７に照射
される。被測定物４７に照射された赤外光Ｌ３２は、そ
の被測定物４７によって反射され、反射光Ｌ３２−１と
して受光素子３４−１〜３４−ｎによって順次受光され
る。受光素子３４−１〜３４−ｎが反射光Ｌ３２−１を
順次受光すると、受光素子３４−１〜３４−ｎに順次電
流が流れる。この電流は増幅器３９で増幅され、ＡＮＤ
ゲート４１，４２に入力される。この時、クロック信号
φ４が“Ｈ”、クロック信号φ５が“Ｌ”なので、出力
端子４３のみに被測定物４７に印刷された模様について
のデータを示す出力信号が順次出力される。クロック信
号φ１が“Ｌ”に反転し、さらにクロック信号φ２が
“Ｈ”、クロック信号φ３が“Ｈ”、クロック信号φ４
が“Ｌ”、クロック信号φ５が“Ｈ”になると、発光素
子アレイ３２がオフすると共に、シフトレジスタ３７ａ
がスイッチ３７−１〜３７−ｎを順次オンする。スイッ
チ３７−１〜３７−ｎが順次オンすると、発光素子３３
−１〜３３−ｎに順次電流が流れ、発光素子３３−１〜
３３−ｎが順次赤色光Ｌ３３を発光する。クロック信号
φ３が“Ｈ”の時に、シフトレジスタ３８ａはＮＭＯＳ
３８−１〜３８−ｎのゲートに順次電圧を印加するの
で、それらのＮＭＯＳ３８−１〜３８−ｎが順次オンす
る。ＮＭＯＳ３８−１〜３８−ｎが順次オンすると、受
光素子３５−１〜３８−ｎは、順次受光可能（オン）状
態になる。この場合、例えば発光素子３３−１がオンす
ると、受光素子３４−１のみがオンし、他の発光及び受
光素子はすべてオフしている。次に、発光素子３３−２
がオンすると、受光素子３４−２のみがオンし、他はす
べてオフしている。以下、発光素子３３−３〜３３−ｎ
及び受光素子３４−３〜３４−ｎについても同様であ
る。発光素子３３−１〜３３−ｎから順次発光された赤
色光Ｌ３３は、被測定物４７に照射される。被測定物４
７に照射された赤色光Ｌ３３は、その被測定物４７によ
って反射され、反射光Ｌ３３−１として受光素子３４−
１〜３４−ｎによって受光される。受光素子３４−１〜
３４−ｎが順次反射光Ｌ３３−１を受光すると、それら
の受光素子３４−１〜３４−ｎに順次電流が流れる。こ
の電流は増幅器３９で増幅され、ＡＮＤゲート４１，４
２に入力される。この時、クロック信号φ４が“Ｌ”、
クロック信号φ５が“Ｈ”なので、出力端子４４のみに
被測定物４７に印刷された色についてのデータを示す出
力信号が順次出力される。以下、同様にして発光素子ア
レイ３２と３３が交互に発光し、発光素子３２−１〜３
２−ｎが順次発光している時には、発光素子アレイ３３
はオフしており、マルチプレクサ回路３８の出力は出力
端子４３のみに順次出力される。発光素子３３−１〜３
３−ｎが順次発光している時には、発光素子アレイ３２
はオフしており、マルチプレクサ回路３８の出力は出力
端子４４のみに順次出力される。このようにして、出力
端子４３，４４に出力された、それぞれ被測定物４７の
模様及び色についてのデータを示す出力信号は、次段に
接続される図示しない信号処理回路等によって処理さ
れ、その被測定物４７の模様及び色の識別が行われる。
本実施例では、次のような利点を有している。（Ａ）受光素子アレイ３４を単一のもので構成し、発
光素子アレイ３２，３３及び受光素子アレイ３４を同一
パッケージ内に収納したので、受発光部３１の小型化が
図れる。（Ｂ）交互に“Ｈ”又は“Ｌ”となるクロック信号φ
１，φ２によって発光素子アレイ３２と３３を交互に発
光させるようにしたので、赤外光Ｌ３２、赤色光Ｌ３
３、及び反射光Ｌ３２−１，Ｌ３３−１間の相互干渉を
排斥できる。そのため、信頼性の高い受光精度が得ら
れ、識別精度を向上できる。（Ｃ）クロック信号φ１，φ２に同期したクロック信
号φ３に基づき、マルチプレクサ回路３８が受光素子３
４−１〜３４−ｎをオン・オフ制御する。これにより、
受光素子アレイ３４は、発光素子アレイ３２及び３３か
らの反射光Ｌ３２−１，Ｌ３３−１を異なるタイミング
で受光できる。そのため、発光素子アレイ３２，３３に
対して１個の受光素子アレイ３４を設ければよく、その
受光素子アレイ３４に対してマルチプレクサ回路３８及
び増幅器３９をそれぞれ１個ずつ設ければよい。従っ
て、光結合装置の回路構成を簡略化できる。（Ｄ）選択回路４０を設けたので、発光素子アレイ３
２及び３３からの光を受光したマルチプレクサ回路３８
の出力信号を、それぞれ発光素子アレイ３２あるいは３
３によるものに選別して出力できる。そのため、受発光
部３１を単一の受光素子アレイ３４で構成することが可
能になる。（Ｅ）受発光部３１を小型化し、かつマルチプレクサ
回路３８及び増幅器３９を１個ずつ省略したので、光結
合装置全体を小型化できると共に、製造コストを大幅に
削減できる。なお、本発明は図示の実施例に限定され
ず、種々の変形が可能である。その変形例としては、例
えば次のようなものがある。（ａ）受発光部３１は、その発光素子３２−１〜３２
−ｎ，３３−１〜３３−ｎ、及び受光素子３４−１〜３
４−ｎの配列を種々に変形して構成することが可能であ
る。例えば、第７図に示すように、同一直線上に、発光
素子３２−１〜３２−ｎと３３−１〜３３−ｎを交互に
配列したりなどしてもよい。この場合、受光素子３４−
１〜３４−ｎは、それぞれ順に発光素子３２−１及び３
３−１間、発光素子３２−２及び３３−２間、……発光
素子３２−ｎ及び３３−ｎ間に隣接配置される。第７図
のような構成にした場合には、第４図に比べてさらに受
発光部の小型化が図れる。（ｂ）上記実施例では、発光素子アレイ３２，３３を
ＬＥＤで、受光素子アレイ３４をホトダイオードでそれ
ぞれ構成したが、これらは他の素子で構成してもよい。
例えば、受光素子アレイ３４をホトトランジスタ等で構
成してもよい。（ｃ）ドライブ回路３５，３７は、その回路構成の変
更が可能である。例えば、特性向上のために、ラッチ回
路やゲート回路等を付加して構成してもよい。（ｄ）マルチプレクサ回路３８の構成は、種々の変形
が可能である。例えば、スイッチ３８−１〜３８−ｎを
バイポーラトランジスタ等で構成してもよい。（ｅ）選択回路４０は、ＡＮＤゲート以外にも他の論
理ゲート等で構成してもよい。（ｆ）発光素子３２−１〜３２−ｎ，３３−１〜３３
−ｎの点灯（発光）方法は、種々の変形が可能である。
上記実施例では、発光素子３２−１〜３２−ｎを順次全
て点灯させた後、発光素子３３−１〜３３−ｎを順次全
て点灯させたが、発光素子３２−１、３３−１、３２−
２、３３−２、……３２−ｎ、３３−ｎという順に点灯
させるようにしてもよい。この場合、発光素子３２−１
あるいは３３−１が点灯している間は、受光素子３４−
１のみがオンし、発光素子３２−２あるいは３３−２が
オンしている間は、受光素子３４−２のみがオンし、以
下同様にして受光素子３４−３〜３４−ｎまで順次オン
する。これらの点灯方法の変形は、前記（ａ）の第７図
等の受発光部にも適用される。（ｇ）発光素子アレイ３２，３３は、それぞれ赤外光
Ｌ３２と赤色光Ｌ３３を発光するようにしたが、発光素
子アレイ３２，３３は、赤外発光用と赤色発光用に限定
されず、これ以外にも互いに発光波長の異なる発光素子
で構成することができる。（ｈ）上記実施例では、反射型ホトインタラプタにつ
いて説明したが、本発明は透過型ホトインタラプタ等の
他の光結合装置にも幅広く適用が可能である。又、上記
実施例では、第１図の光結合装置をＡＴＭ等に設けて紙
幣等の模様及び色の識別を行うものとして説明したが、
本発明はこの用途に限定されず、種々の用途に応用が可
能である。（発明の効果）以上詳細に説明したように、第１の発明
によれば、第１と第２の発光素子を交互に発光させ、そ
れを交互に受光素子で受光するようにしたので、第１の
発光素子から発光される第１の光と第２の発光素子から
発光される第２の光との相互干渉を防止できる。そのた
め、第１，第２の発光素子と受光素子とを同一のパッケ
ージ内に収納することが可能になり、受発光部を小型化
できる。さらに、受光素子で受光した出力信号を第３の
回路によって選択的に出力し、それを第４の回路によっ
て選択的に出力端子へ転送できる。そのため、受光素子
を単一化でき、それによって回路構成を簡単化できる。
従って、光結合装置全体を小型化できると共に、該装置
の製造コストを大幅に低減できる。第２の発明によれ
ば、第１，第２の発光素子と受光素子とを同一基板上に
設けて受発光素子を構成したので、受発光部をより小型
化できる。第３の発明によれば、受光素子を挟むように
第１と第２の発光素子を配置したので、それらの形成面
積のより縮小化が可能となる。第４の発明によれば、第
１と第２の発光素子を交互に配置し、それらと対になる
ように受光素子を配置したので、それらの形成面積をよ
り小さくできる。第５の発明によれば、第１の光として
赤外光、第２の光として赤色光を用いているので、それ
らの相互干渉をより的確に防止できる。第６の発明によ
れば、第１の光と第２の光を交互に被測定物へ照射し、
それらの第１と第２の光を交互に受光して該出力信号を
交互に出力端子へ転送するようにしたので、第１と第２
の光の相互干渉を防止し、それらを受光した出力信号を
的確に出力端子へ出力できる。従って、精度の高い光結
合が行え、的確に被測定物の検出が可能となる。第７の
発明によれば、第１の期間において第１の発光素子から
被測定物へ第１の光を照射し、それを受光して出力端子
へ出力し、第２の期間において第２の発光素子から発光
した第２の光で被測定物を照射し、それを受光して前記
出力端子へ出力するようにしたので、より簡単に光結合
が行え、第１と第２の光信号間の相互干渉を防止して被
測定物を高精度で検出できる。第８の発明によれば、第
５の発明と同様に、第１の光として赤外光、第２の光と
して赤色光を用いているので、それらの相互干渉をより
的確に防止できる。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a reflective photointerrupt.
It has a light emitting element array and a light receiving element array such as
The present invention relates to an optical coupling device and an optical coupling method thereof. (Prior Art) Conventionally, as a technology in such a field,
For example, there is one as shown in FIG. Below, the structure
The composition will be described with reference to the drawings. FIG. 2 shows a conventional optical coupling device.
Is a building block of a reflective photointerrupter.
It is a figure. This optical coupling device is used, for example, in a bank or the like.
Automatic deposit teller machine (Automatic Teller '
s Machine: hereinafter referred to as ATM), etc.,
It is used as a sensor to identify bills, etc.
It has two light emitting and receiving parts 1 and 11. Incoming one
The light unit 1 has a function of emitting and receiving infrared light,
Consists of a light emitting element array 2 for light emission and a light receiving element array 3
Has been done. The light emitting element array 2 is connected to the power supply voltage Vcc.
Drive that drives the light emitting element array 2 while continuing
The drive circuit 4 connected to the circuit 4 is a clock circuit.
Connected to 5. The light receiving element array 3 has a power supply voltage V
It is connected to cc and drives the light receiving element array 3
It is connected to the multiplexer circuit 6 and its multiplex
Circuit 6 is connected to output terminal 8 via amplifier 7.
It The other light emitting / receiving unit 11 emits and receives red light.
Light emitting element array 12 for red light emission and light reception
It is composed of an element array 13. Light emitting element array 12
Is connected to the power supply voltage Vcc and
B is connected to the drive circuit 14 for driving
The live circuit 14 is connected to the clock circuit 15.
When the light receiving element array 13 is connected to the power supply voltage Vcc,
Both are multiplexer times for driving the light receiving element array 13.
Connected to line 16 and its multiplexer circuit 16 amplifies
It is connected to the output terminal 18 via the device 17. Fig. 3
Is a schematic external view of the two light emitting / receiving sections 1 and 11 in FIG.
Is. One of the light emitting / receiving unit 1 has a substrate 21, and the substrate
21, the light emitting elements 2-1, 2-2 for infrared light emission,
The light emitting element array 2 in which 2-n are arranged in an array is
Has been formed. Adjacent to the light emitting elements 2-1 to 2-n,
Light receiving elements 3-1, 3-2, ..., 3-n are arranged in an array
The light receiving element array 3 is formed. From these
The optical element array 2 and the light receiving element array 3 are transparent for the optical path.
It is housed in a package 22 provided with windows and the like.
The other light emitting / receiving unit 11 has a substrate 23, and on the substrate 23
In the same manner as the light emitting / receiving unit 1, the light emitting element 12 for red light emission is included.
, 12-2, ..., 12-n light emitting element array
12, from the light receiving elements 13-1, 13-2, ..., 13-n
And the light receiving element array 13 is formed, and the package 24
It is stored inside. Optical coupling device configured as above
The operation of the apparatus and its optical coupling method will be described. Light emitting / receiving unit 1,
11, a bill, for example, by a feeding device (not shown)
To be measured 2 with a pattern consisting of multiple colors such as
Send 5. The device under test 25 is sent to the light emitting / receiving unit 1.
And the clock signal from the clock circuit 5,
Infrared light from the light emitting element array 2 is controlled by the Eve circuit 4.
L2 is emitted and irradiates the DUT 25. DUT
The infrared light L2 radiated on the object 25 is measured by the device under test 25.
Is reflected and becomes reflected light L3. This reflected light L3 is
In the light receiving element array 3 controlled by the multiplexer circuit 6,
Therefore, the light is received. Multiply by receiving the reflected light L3
The lexer circuit 6 is a pattern data printed on the DUT 25.
Output signal that indicates that the output signal is amplified
It is output to the output terminal 8 via the device 7. Output to output terminal 8
The output signal applied is connected to the next stage (not shown).
The pattern of the DUT 25 processed by the signal processing circuit, etc.
Are identified. Similarly, the DUT 25 is placed on the light emitting / receiving unit 11.
To the red light L1.
Emits 2. This red light L12 is reflected by the object to be measured 25.
To become reflected light L13, and the reflected light L13 is the light receiving element.
Light is received by the array 13 and is similar to the case of the light emitting / receiving unit 1.
Then, the color of the DUT 25 is identified. (Problems to be solved by the invention)
In the optical coupling device and its optical coupling method, the following
There was a problem. Conventionally, the light emitting and receiving unit 1 for infrared light and the red light
The light emitting / receiving unit 11 and the packages 22 and 2 are separate from each other.
4 and their packages 22, 24 are spaced apart
Are separated from each other. As a result, the light emitting and receiving unit becomes larger.
Manufacturing costs such as material costs and assembly costs.
The strike will be high. Furthermore, each light emitting / receiving unit 1, 11
Multiplexer circuits 6, 16 and amplifiers 7, 17 for each
Must be provided, and if the circuit configuration becomes complicated accordingly
There was a problem saying. To solve this problem, for example,
Housing the light emitting and receiving parts 1 and 11 in the same package
Therefore, it is possible to reduce the size of the light emitting / receiving unit. By the way
Is the infrared light L2 emitted by the light emitting / receiving units 1 and 11, respectively.
The emission wavelength of the red light L12 is different for each identification target.
Depends on Therefore, the light receiving and emitting parts 1 and 11
Infrared light L2 and red light L when stored in the same package
12 and the reflected lights L3 and L13 may cause mutual interference.
There is. When mutual interference occurs, the light receiving element arrays 3, 13
Light will not be received accurately due to
Another accuracy deteriorates. To prevent this deterioration of identification accuracy
Between the light emitting / receiving parts 1 and 11 housed in the same package.
It is also conceivable to provide a shield on the. But the shield
If it is provided, the circuit scale will be rather large, and the manufacturing cost will increase.
I'm sick. In addition, the light emitting and receiving parts 1 and 11 are packaged in the same package.
The circuit configuration is still complicated
It In this way, the light emitting and receiving parts 1 and 11 are packaged in the same package.
And an optical coupling device that is technically satisfactory even when stored in
No optical coupling method is available. The present invention has the above-mentioned conventional technology.
One of the problems that was facing
Solution to the problem of high cost and complicated circuit configuration.
An optical coupling device and an optical coupling method are provided.
It (Means for Solving the Problem) The first aspect of the present invention provides the above-mentioned object.
In order to solve the above, in the optical coupling device,
A first light emitting element which emits a first light having a length;
Second light-emitting element that emits second light having an emission wavelength of
And in response to the first and second control signals, the first and second control signals.
First and second circuits for sequentially switching the outputs of the second light emitting element
A light receiving element for receiving the first and second light, and a third
And a fourth circuit. The third circuit is
Responsive to a third control signal synchronized with the first and second control signals.
In response, the light reception of the first and second light is sequentially switched, and
When the first light is received, a first output signal is output,
Circuit that outputs a second output signal when receiving the second light
Is. The fourth circuit receives the first and second control signals.
Synchronize and sequentially switch the first and second output signals
It is a circuit that transfers to the output terminal. In the second invention,
Emits a first light having a first emission wavelength in the combination device.
A first light emitting element that emits light, and a second light emitting element that has a second emission wavelength
A second light emitting element that emits the light of
Receiving and emitting light on the same substrate as the light receiving element that receives light
Equipped with elements. In the third invention, the first invention of the second invention
And a second light emitting element, the first light emitted from these
And arranged so as to sandwich the light receiving element for receiving the second light
is doing. In a fourth invention, the first and second inventions of the second invention are provided.
A plurality of light emitting elements are alternately arranged, and the first and second
Receiving the first and second light emitted from the light emitting element
Pairing the light receiving element with the first and second light emitting elements.
Are arranged so that In the fifth invention, the first, second,
In the third or fourth invention, infrared light is used as the first light,
Red light is used as the second light. In the sixth invention,
In the optical coupling method, in response to the first and second control signals,
A first light having a first emission wavelength and a second emission wavelength
Alternately emits second light having a value of
And in response to a third control signal synchronized with the second control signal.
And alternately receives the first and second lights. And before
It is synchronized with the first and second control signals, and
Alternately transfer the output signal by receiving the light of 2 to the output terminal
I am trying to do it. In the seventh invention, the optical coupling method
In response to the first control signal of the first level during the first period.
In response, the first light emitting device emits the first light having the first emission wavelength.
The first light is emitted to the DUT, and the first level
In response to the second control signal of the second light emitting element,
Emission of a second light having an emission wavelength of
Responsive to the second control signal at a second level for
From the second light emitting element to the object to be measured.
Emits light and responds to the first control signal at a second level
Then, the first light emitting element emits the first light.
Prohibit In the first period, the first control signal
In response to the synchronized first level third control signal,
The first light is received, and the first output signal is received by this light reception.
Output, and then in the second period, before the first level
Receiving the second light in response to the third control signal,
A second output signal is output by this light reception. And before
In the first period, the first control signal at the first level is
Signal, and transfers the first output signal to the output terminal
And then in the second period, the first level of the first
The second output signal in synchronization with the second control signal.
I am trying to transfer to the input terminal. In the eighth invention,
In the sixth or seventh invention, the first light is infrared light,
Red light is used as the second light. (Operation) According to the first invention, as described above, the optical coupling device is provided.
Since the first and second circuits are configured as
The first light and the second light are emitted alternately from the second light emitting element.
Be done. In the third circuit, in synchronization with the first and second circuits
The first and second lights are sequentially switched and received, and the first and second lights are received.
To output to the fourth circuit. In the fourth circuit,
First and second output signals in synchronization with the first and second circuits
Are sequentially switched and transferred to the output terminal. According to the second invention
For example, the first and second light emitting elements and the light receiving element are on the same substrate.
The light emitting and receiving element provided in
is there. According to the third and fourth inventions, the first and second
The optical element and the light receiving element are formed on the same substrate with the minimum area.
There is a function to work. According to the fifth invention, red is used as the first light.
Using red light as outside light, the second light is
It works to suppress mutual interference. According to the sixth invention,
Alternate between the first and second light based on the first and second control signals
Is irradiated to the object to be measured. These first and second lights are
Lights are received alternately and their output signals are alternately output.
Transferred. According to the seventh aspect, in the first period, the first
The first light is emitted from the light emitting element of
Receives light and outputs the first output signal and transfers it to the output terminal
To be done. Next, in the second period, the second light-emitting element is exposed.
The second light is applied to the measurement object, and the second light is received and the second light is received.
The output signal is output and transferred to the output terminal. 8th departure
According to Ming, like the fifth invention, the infrared light of the first light,
And the red light of the second light prevents their mutual interference
It has a function. Therefore, the above problem can be solved. (Embodiment) FIG. 1 shows an optical coupling device according to an embodiment of the present invention.
In the block diagram of the configuration of the reflection type photo interrupter,
is there. This optical coupling device is used, for example, in an ATM in a bank or the like.
Used as a sensor to identify bills, etc.
It has a light emitting and receiving portion 31. Light emitting and receiving unit 3
1 is two light emitting element arrays 32 and 33 and one light receiving element array.
It has an optical element array 34. One light emitting element array
32 has a function of emitting infrared light L32, and has a power supply voltage
Vcc and drive circuit (first circuit) 35 respectively
It is connected. The drive circuit 35 is a light emitting element array
This is a circuit for controlling the on / off of 32.
The clock circuit 35 has a clock for generating a clock signal (control signal).
The lock circuit 36 is connected. Clock circuit 36
Are clock signals (first signal) at predetermined timings.
Control signal) φ1, clock signal (second control signal) φ
2, clock signal (third control signal) φ3, and clock
It is a circuit for outputting the black signals φ4 and φ5, respectively. The other
The light emitting element array 33 has a function of emitting red light L33.
With a power supply voltage Vcc and a drive circuit (second circuit).
Roads 37, respectively. Drive circuit 37
Is a circuit for controlling ON / OFF of the light emitting element array 33.
The drive circuit 37 has a clock circuit 36
It is connected. The light receiving element array 34 is an infrared light L32.
Reflected light L32-1 and reflected light L33 of red light L33
-1 has the function of receiving light respectively, and the power supply voltage Vcc and
And the multiplexer circuit (third circuit) 38, respectively.
Has been continued. The multiplexer circuit 38 includes a light receiving element
It is a circuit that controls on / off of ray 34,
The multiplexer circuit 38 is connected to the path 36 and
Connected to the input side of an amplifier 39 that amplifies the output of
It The output side of the amplifier 39 has a selection circuit (fourth circuit) 4
It is connected to 0. The selection circuit 40 is increased by the amplifier 39.
The output of the widened multiplexer circuit 38 is reflected by the reflected light L3.
Output by 2-1 (first output signal) and reflected light L33
-1 output (second output signal) and
Is a circuit that selectively outputs
It is composed of the terminals 41 and 42. One AND gate
The input side of 41 is the output side of the amplifier 39 and the clock circuit.
36, and the output side of the AND gate 41 reflects
Output signal of the multiplexer circuit 38 by the light L32-1
Is connected to the output terminal 43 for outputting. AND game
The input side of the amplifier 42 is connected to the output side of the amplifier 39 and the clock circuit.
The output side of the AND gate 42 connected to the path 36 is
Output signal of the multiplexer circuit 38 by the light L33-1
Signal is output to the output terminal 44. Fig. 4
3 is an external view showing an outline of the light emitting / receiving unit 31 in FIG.
It The light emitting / receiving unit 31 has a substrate 45, and the substrate 45
Above, for example, a light emitting diode (hereinafter referred to as LED)
Infrared light emitting elements 32-1, 32-2,
The light emitting element array 3 in which 32-n are arranged in an array
2 is formed. These light emitting elements 32-1 to 32
-Adjacent to -n, a red light-emitting
The optical elements 33-1, 33-2, ..., 33-n are arrayed.
An array of light emitting element arrays 33 is formed. Furthermore
In addition, the light emitting elements 32-1 to 32-n and the light emitting elements 33-1 to
33-n, for example, a receiving device composed of a photodiode.
The optical elements 34-1, 34-2, ..., 34-n are arranged in an array.
The arrayed light receiving element array 34 is formed. this
Light emitting element arrays 32 and 33 and light receiving element array 34
Is infrared light L32, red light L33, and reflected light L32-
1, L33-1 is provided with a transparent window or the like that serves as an optical path.
It is stored in the cage 46. FIG. 5 shows the light of FIG.
It is a circuit diagram of a coupling device. One light emitting element array 32
Is an anode of the plurality of light emitting elements 32-1 to 32-n
Side is commonly connected to the power supply voltage Vcc, and its cathode side is
It is connected to the drive circuit 35. Drive circuit 35
Is formed by connecting two transistors in a Darlington connection.
A plurality of switches 35-1, 35-2, ..., 35-n
And switches 35-1 to 35-n to clock signal φ1
And a shift register 35a that controls on / off based on
It is composed of Of each switch 35-1 to 35-n
The collector is on the cathode side of the light emitting elements 32-1 to 32-n.
And the emitter is commonly connected to ground potential GND.
The base is connected to the shift register 35a.
The other light emitting element array 33 has a plurality of light emitting elements 33.
The anode side of -1 to 33-n is commonly connected to the power supply voltage Vcc.
And the cathode side is connected to the drive circuit 37.
It The drive circuit 37 has two transistors
A plurality of switches 37-1, 3 that are configured by connecting them together.
7-2, ..., 37-n and switches 37-1 to 37-
A shifter that controls ON / OFF of n based on the clock signal φ2.
Register 37a. Each switch 3
The collectors of 7-1 to 37-n are light emitting elements 33-1 to 3-3.
The cathode of 3-n, the emitter to the ground potential GND,
Are connected to the shift register 37a.
It The light receiving element array 34 includes a plurality of light receiving elements 34-
The cathode side of 1 to 34-n is commonly connected to the power supply voltage Vcc
And the anode side is connected to the multiplexer circuit 38.
ing. The multiplexer circuit 38 has a plurality of N channels.
Type MOS transistor (hereinafter referred to as NMOS) 38-
, 38-2, ..., 38-n, and each NMOS 38-1.
38-n is controlled on / off based on the clock signal φ3.
Shift register 38a. Each NM
The sources of the OSs 38-1 to 38-n are the light receiving elements 34-1.
~ 34-n anode, drain to amplifier 39,
To the shift register 38a and the substrate to ground
Each is connected to the potential GND. As above
The operation of the configured optical coupling device and the optical coupling method thereof will be described below.
This will be described with reference to FIG. FIG. 6 shows the optical coupling of FIG.
FIG. 7 is an operation timing chart of the device and the optical coupling method thereof. This
Here, the clock signals φ1 and φ2 are alternately activated.
Signal (for example, a signal that goes high or low)
No.). The clock signal φ3 is the clock signals φ1 and φ
The signal synchronized with 2 and the two clock signals φ4 and φ5 are
These signals are synchronized with the clock signals φ1 and φ2, respectively.
On the light emitting / receiving unit 31, for example, by a feeding device (not shown)
For example, an object with a pattern of multiple colors, such as a banknote, is printed.
Send the measurement object 47. The measured object 47 is sent to the light emitting / receiving unit 31.
The clock signal φ1 goes high during the first period.
It becomes the level (hereinafter referred to as “H”), and the clock signal φ
2 is low level (hereinafter referred to as "L"), clock signal
φ3 is “H”, clock signal φ4 is “H”, clock signal
The signal φ5 becomes "L". Clock signal φ1 is in the first period
Is repeatedly input as "H" in the second period and "L" in the second period.
Then, when it is "H", the switches 35-1 to 35-n are sequentially turned on.
To Switches 35-1 to 35-n are sequentially turned on
Then, a current sequentially flows through the light emitting elements 32-1 to 32-n,
These light emitting elements 32-1 to 32-n are sequentially connected to the infrared light L32.
Emits light. Clock signal φ3 repeats "H" and "L"
When it is returned and input, when it is "H", the shift register 3
8a sequentially applies voltage to the gates of the NMOSs 38-1 to 38-n.
Are applied to these NMOSs 38-1 to 38-n.
Turn on sequentially. NMOS 38-1 to 38-n are turned on sequentially
Then, the light receiving elements 34-1 to 34-n can sequentially receive light.
Noh (on) state. In this case, for example, the light emitting element 32
When -1 is turned on, only the light receiving element 34-1 is turned on.
All other light emitting and light receiving elements are off. Next
When the light emitting element 32-2 is turned on, the light receiving element 34-2
Only on, all others off. Below, the luminescent element
Child 32-3 to 32-n and light receiving elements 34-3 to 34-n
Is also the same. Light emitting elements 32-1 to 32-n
The infrared light L32 sequentially emitted from the above is applied to the DUT 47.
To be done. The infrared light L32 emitted to the DUT 47 is
Reflected by the object to be measured 47 and reflected light L32-1
And are sequentially received by the light receiving elements 34-1 to 34-n.
It The light receiving elements 34-1 to 34-n reflect the reflected light L32-1.
When light is sequentially received, the light receiving elements 34-1 to 34-n are sequentially charged.
The flow flows. This current is amplified by the amplifier 39 and ANDed
It is input to the gates 41 and 42. At this time, the clock signal
Since φ4 is “H” and clock signal φ5 is “L”, output
About the pattern printed on the DUT 47 only at the terminal 43
The output signals indicating the data are sequentially output. Clock signal
Signal φ1 is inverted to "L", and clock signal φ2 is
“H”, clock signal φ3 is “H”, clock signal φ4
Is “L” and the clock signal φ5 is “H”, the light emitting element
The child array 32 turns off, and the shift register 37a
Sequentially turns on the switches 37-1 to 37-n. Switch
When the switches 37-1 to 37-n are sequentially turned on, the light emitting element 33
A current sequentially flows to the light emitting elements 33-1 to 33-n and the light emitting elements 33-1 to 3-3
33-n sequentially emit red light L33. Clock signal
When φ3 is “H”, the shift register 38a is NMOS
The voltage is sequentially applied to the gates of 38-1 to 38-n.
Then, those NMOSs 38-1 to 38-n are sequentially turned on.
It When the NMOS 38-1 to 38-n are sequentially turned on, the reception
The optical elements 35-1 to 38-n are capable of sequentially receiving light (ON)
It becomes a state. In this case, for example, the light emitting element 33-1 is turned on.
Then, only the light receiving element 34-1 is turned on, and other light emission and light reception are performed.
All light elements are off. Next, the light emitting element 33-2
When is turned on, only the light receiving element 34-2 is turned on, and the others are turned on.
It's all off. Hereinafter, the light emitting elements 33-3 to 33-n
The same applies to the light receiving elements 34-3 to 34-n.
It Red sequentially emitted from the light emitting elements 33-1 to 33-n
The color light L33 is applied to the DUT 47. DUT 4
The red light L33 radiated to 7 is emitted by the device under test 47.
Are reflected by the light receiving element 34-3 as reflected light L33-1.
The light is received by 1 to 34-n. Light receiving element 34-1 to
When 34-n receives the reflected light L33-1 sequentially,
Current sequentially flows through the light receiving elements 34-1 to 34-n. This
Is amplified by the amplifier 39, and AND gates 41, 4
Entered in 2. At this time, the clock signal φ4 is “L”,
Since the clock signal φ5 is “H”, only output terminal 44
Output showing data about the color printed on the DUT 47.
Force signals are sequentially output. Thereafter, the light emitting element
Rays 32 and 33 alternately emit light, and light emitting elements 32-1 to 32-1
When 2-n sequentially emit light, the light emitting element array 33
Is off, and the output of the multiplexer circuit 38 is an output.
It is sequentially output only to the terminal 43. Light emitting elements 33-1 to 3-3
When 3-n sequentially emit light, the light emitting element array 32
Is off, and the output of the multiplexer circuit 38 is an output.
It is sequentially output only to the terminal 44. In this way, the output
Of the DUT 47 output to the terminals 43 and 44, respectively.
The output signal showing the data about the pattern and color is
Processed by a signal processing circuit (not shown) connected
Then, the pattern and color of the DUT 47 are identified.
The present embodiment has the following advantages. (A) The light receiving element array 34 is composed of a single element, and
The optical element arrays 32 and 33 and the light receiving element array 34 are the same.
Since it is housed in the package, the size of the light emitting / receiving unit 31 can be reduced.
Can be achieved. (B) Clock signal φ that alternately becomes “H” or “L”
Light emitting element arrays 32 and 33 are alternately emitted by 1 and φ2.
Since it was made to illuminate, infrared light L32, red light L3
3 and the mutual interference between the reflected lights L32-1, L33-1
Can be excluded. Therefore, it is possible to obtain highly reliable light receiving accuracy.
Therefore, the identification accuracy can be improved. (C) Clock signal synchronized with clock signals φ1 and φ2
Based on the signal φ3, the multiplexer circuit 38 causes the light receiving element 3
4-1 to 34-n are turned on / off. This allows
The light receiving element array 34 is the light emitting element arrays 32 and 33.
Reflected light L32-1, L33-1 from the different timing
Can receive light. Therefore, in the light emitting element arrays 32 and 33,
It is sufficient to provide one light receiving element array 34 for the
A multiplexer circuit 38 and a light receiving element array 34
It suffices to provide one each and one amplifier 39. Obey
Thus, the circuit configuration of the optical coupling device can be simplified. (D) Since the selection circuit 40 is provided, the light emitting element array 3
Multiplexer circuit 38 that receives the light from 2 and 33
Output signals of the light emitting element array 32 or 3 respectively.
3 can be selected and output. Therefore, it receives and emits light
The part 31 can be configured by a single light receiving element array 34.
Become Noh. (E) The light emitting / receiving unit 31 is downsized, and the multiplexer
Since the circuit 38 and the amplifier 39 are omitted one by one,
The overall manufacturing device can be downsized and the manufacturing cost can be significantly increased.
Can be reduced. The present invention is not limited to the illustrated embodiment.
Instead, various modifications are possible. As a modification,
For example, there are the following. (A) The light emitting / receiving unit 31 has the light emitting elements 32-1 to 32.
-N, 33-1 to 33-n, and light receiving elements 34-1 to 34-3
The 4-n array can be variously modified and configured.
It For example, as shown in FIG. 7, light emission on the same straight line
Alternating elements 32-1 to 32-n and 33-1 to 33-n
They may be arranged or the like. In this case, the light receiving element 34-
1 to 34-n are light emitting elements 32-1 and 3 in order, respectively.
3-1 between the light emitting elements 32-2 and 33-2, ...
Adjacently arranged between the elements 32-n and 33-n. Fig. 7
In the case of the configuration as shown in FIG.
The light emitting unit can be downsized. (B) In the above embodiment, the light emitting element arrays 32 and 33 are
It is an LED, and the light receiving element array 34 is a photodiode.
Although they are configured respectively, they may be configured by other elements.
For example, the light receiving element array 34 may be configured by a phototransistor or the like.
May be done. (C) The drive circuits 35 and 37 have a modified circuit configuration.
It is possible to change. For example, in order to improve the characteristics,
It may be configured by adding a path or a gate circuit. (D) The multiplexer circuit 38 has various modifications.
Is possible. For example, the switches 38-1 to 38-n
It may be composed of a bipolar transistor or the like. (E) The selection circuit 40 is not limited to AND gates
It may be configured by a logic gate or the like. (F) Light emitting elements 32-1 to 32-n, 33-1 to 33
Various modifications can be made to the lighting (light emission) method of -n.
In the above embodiment, all the light emitting elements 32-1 to 32-n are sequentially arranged.
The light-emitting elements 33-1 to 33-n in order.
The light emitting elements 32-1, 33-1 and 32-
2, 33-2, ... 32-n, 33-n light in this order
You may allow it. In this case, the light emitting element 32-1
Alternatively, while 33-1 is lit, the light receiving element 34-
Only 1 turns on and the light emitting element 32-2 or 33-2
While it is turned on, only the light receiving element 34-2 is turned on.
Similarly, the light receiving elements 34-3 to 34-n are turned on in the same manner as below.
To do. A modification of these lighting methods is shown in FIG.
It is also applied to the light emitting and receiving parts such as. (G) The light emitting element arrays 32 and 33 are infrared light
L32 and red light L33 are emitted.
The child arrays 32 and 33 are limited to infrared light emission and red light emission
In addition to this, light-emitting elements having different emission wavelengths from each other
Can be composed of (H) In the above embodiment, only the reflection type photo interrupter is used.
However, the present invention is not limited to the transparent photointerrupter and the like.
It can be widely applied to other optical coupling devices. Also, above
In the embodiment, the optical coupling device shown in FIG.
Although it has been explained that the patterns and colors of bills and the like are identified,
The present invention is not limited to this application and can be applied to various applications.
Noh. (Effects of the Invention) As described in detail above, the first invention
According to the method, the first and second light emitting elements are caused to emit light alternately, and
Since these are alternately received by the light receiving element, the first
From the first light emitted from the light emitting element and the second light emitting element
Mutual interference with the emitted second light can be prevented. That
Therefore, the first and second light emitting elements and the light receiving element are packaged in the same package.
It becomes possible to store it inside the package
it can. Furthermore, the output signal received by the light receiving element
Output selectively by the circuit and output by the fourth circuit.
Can be selectively transferred to the output terminal. Therefore, the light receiving element
Can be unified, thereby simplifying the circuit configuration.
Therefore, the entire optical coupling device can be downsized, and the device can be downsized.
Can significantly reduce the manufacturing cost. According to the second invention
For example, the first and second light emitting elements and the light receiving element are on the same substrate.
Since the light emitting and receiving element is provided, the light receiving and emitting section is smaller.
Can be converted. According to the third invention, the light receiving element is sandwiched.
Since the first and second light emitting elements are arranged, their forming surface
It is possible to further reduce the product. According to the fourth invention,
1 and 2 light emitting elements are arranged alternately and paired with them
Since the light receiving elements are arranged like
Can be made smaller. According to the fifth invention, as the first light
Since infrared light and red light are used as the second light,
Mutual interference between them can be prevented more accurately. According to the sixth invention
Then, the first light and the second light are alternately emitted to the object to be measured,
Alternately receive the first and second light and output the output signal.
Since the data is transferred to the output terminals alternately, the first and second
The mutual interference of the light of the
Can be accurately output to the output terminal. Therefore, high-precision light
Therefore, the object to be measured can be accurately detected. 7th
According to the invention, from the first light emitting element in the first period
Irradiates the DUT with the first light, receives it, and outputs it.
Output from the second light emitting element in the second period.
Irradiate the DUT with the second light,
Since it is output to the output terminal, optical coupling is easier
It is possible to prevent mutual interference between the first and second optical signals, and
The measurement object can be detected with high accuracy. According to the eighth invention,
Similarly to the invention of 5, the infrared light and the second light are used as the first light.
The red light is used to prevent mutual interference between them.
Can be accurately prevented.

【図面の簡単な説明】第１図は本発明の実施例の光結合装置を示す反射型ホト
インタラプタの構成ブロック図、第２図は従来の光結合
装置の構成ブロック図、第３図は第２図中の受発光部の
概略の外観図、第４図は第１図中の受発光部の概略の外
観図、第５図は第１図の回路図、第６図は第１図の動作
タイミング図、第７図は第４図の変形例を示す受発光部
の概略の外観図である。３１…受発光部、３２，３３…発光素子アレイ、３２−
１〜３２−ｎ，３３−１〜３３−ｎ…発光素子、３４…
受光素子アレイ、３４−１〜３４−ｎ…受光素子、３
５，３７…ドライブ回路、３６…クロック回路、３８…
マルチプレクサ回路、３９…増幅器、４０…選択回路、
φ１〜φ５…クロック信号。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a structural block diagram of a reflective photointerrupter showing an optical coupling device according to an embodiment of the present invention, FIG. 2 is a structural block diagram of a conventional optical coupling device, and FIG. 2 is a schematic external view of the light emitting / receiving unit, FIG. 4 is a schematic external view of the light receiving / emitting unit in FIG. 1, FIG. 5 is a circuit diagram of FIG. 1, and FIG. 6 is of FIG. FIG. 7 is an operation timing chart, and FIG. 7 is a schematic external view of a light emitting / receiving unit showing a modification of FIG. 31 ... Receiving and emitting section, 32, 33 ... Light emitting element array, 32-
1 to 32-n, 33-1 to 33-n ... Light emitting element, 34 ...
Light receiving element array, 34-1 to 34-n ... Light receiving element, 3
5, 37 ... Drive circuit, 36 ... Clock circuit, 38 ...
Multiplexer circuit, 39 ... amplifier, 40 ... selection circuit,
φ1 to φ5 ... Clock signals.

Claims

[Claims] 1. A first light emitting first light having a first emission wavelength
A light emitting element and a second light emission for emitting a second light having a second emission wavelength
An element and the first and second control signals in response to the first and second control signals.
First and second circuits that sequentially switch the output of the light emitting element, a light receiving element that receives the first and second light, and a third control signal that is synchronized with the first and second control signals.
In response to, the light reception of the first and second light is sequentially switched,
And when it receives the first light, it outputs a first output signal.
Then, when the second light is received, a second output signal is output.
A third circuit for synchronizing the first and second control signals with the first and second control signals.
A fourth output signal that is sequentially switched and transferred to an output terminal
And an optical coupling device. 2. A first light emitting first light having a first emission wavelength
The light emitting element emits a second light having a second emission wavelength.
A second light emitting element for receiving the first and second light
A light receiving element and a light emitting element provided on the same substrate are provided.
Optical coupling device. 3. The first and second light emitting elements emit light from these.
The light receiving element for receiving the first and second light
3. The optical connection according to claim 2, wherein the optical connection is arranged so that
Combination device. 4. A plurality of the first and second light emitting elements are alternately arranged.
The first and second light emitting elements emit light.
The light receiving element for receiving the first and second light is connected to the first and second light receiving elements.
Characterized in that it is arranged so as to form a pair with the second light emitting element.
The optical coupling device according to claim 2. 5. The first light is infrared light and the second light is red
It is light, The statement of Claim 1, 2, 3, or 4 characterized by the above-mentioned.
On-board optical coupling device. 6. A first emission wavelength in response to the first and second control signals
And a second light having a second emission wavelength
Alternately emits light to the DUT, and is a third control signal synchronized with the first and second control signals.
In response to alternately receiving the first and second light, synchronizing with the first and second control signals,
Alternately transfer the output signal by receiving the second light to the output terminal
An optical coupling method comprising: 7. Responsive to the first control signal of the first level in the first period.
In response, the first light emitting device emits the first light having the first emission wavelength.
The first light is emitted to the DUT, and the first level
In response to the second control signal of the second light emitting element,
Emission of a second light having an emission wavelength of
Responsive to the second control signal at a second level for
From the second light emitting element to the object to be measured.
Emits light and responds to the first control signal at a second level
Then, the first light emitting element emits the first light.
And prohibiting the first control signal synchronized with the first control signal in the first period.
The first light in response to a third control signal at a level of
Receives light, outputs the first output signal by this light reception, and then
In the second period, the third control of the first level
In response to the signal, the second light is received, and the second light is received.
Outputs a second output signal, and controls the first level at the first level during the first period.
Transfers the first output signal to the output terminal in synchronization with the signal
And then in the second period, the first level of the first
The second output signal in synchronization with the second control signal.
An optical coupling method characterized by transferring to an input terminal. 8. The first light is infrared light and the second light is red
The optical coupling according to claim 6 or 7, which is light.
Method.