JP2004226102A - Quality evaluation device of fruits and vegetables - Google Patents

Quality evaluation device of fruits and vegetables Download PDF

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Publication number
JP2004226102A
JP2004226102A JP2003011091A JP2003011091A JP2004226102A JP 2004226102 A JP2004226102 A JP 2004226102A JP 2003011091 A JP2003011091 A JP 2003011091A JP 2003011091 A JP2003011091 A JP 2003011091A JP 2004226102 A JP2004226102 A JP 2004226102A
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light
measured
light receiving
measurement
charge
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JP2003011091A
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JP3923018B2 (en
Inventor
Shinichi Kawabata
真一 河端
Kenichi Iwami
憲一 石見
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Kubota Corp
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Kubota Corp
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Priority to JP2003011091A priority Critical patent/JP3923018B2/en
Priority to US10/540,742 priority patent/US7316322B2/en
Priority to AU2003296077A priority patent/AU2003296077B2/en
Priority to KR1020057011826A priority patent/KR100798518B1/en
Priority to PCT/JP2003/016536 priority patent/WO2004059300A1/en
Priority to CN2003801076012A priority patent/CN1732379B/en
Publication of JP2004226102A publication Critical patent/JP2004226102A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a quality evaluation device of fruits and vegetables capable of avoiding error generation in internal quality information of a measuring object by acquiring light receiving information for quality evaluation in the proper state to the utmost by reducing the remaining charge in a light receiving sensor. <P>SOLUTION: This device is constituted so that the internal quality information of the measuring object M is acquired based on the light receiving information for quality evaluation acquired by receiving transmitted light from the measuring object M by the charge accumulation type light receiving sensor 23. The charge is accumulated in the light receiving sensor 23 from accumulation start timing until elapse of an accumulation setting time, and then a charge accumulation discharge processing for discharging the charge accumulated in the light receiving sensor 23 is executed repeatedly until elapse of a discharge setting time. When the measuring object M reaches a measuring spot, the accumulated charge is discharged, and then a measuring charge accumulation processing for accumulating the charge used for the light receiving information for quality evaluation is executed. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、計測箇所に位置する被計測物としての果菜類に対して光を投射する投光部と、前記被計測物からの透過光又は反射光を電荷蓄積型の受光センサにて受光して品質評価用の受光情報を得る受光部と、前記被計測物を前記計測箇所を経由して搬送する搬送手段と、前記受光部の前記受光情報に基づいて被計測物の内部品質情報を求めるとともに各部の動作を制御する制御手段とを備えて構成されている果菜類の品質評価装置に関する。
【０００２】
【従来の技術】
上記果菜類の品質評価装置は、被計測物として例えば蜜柑や林檎等の果菜類における品質、例えば糖度や酸度等の内部品質を非破壊状態で計測するためのものであるが、このような品質評価装置として、従来では、次のような構成のものがあった。
【０００３】
すなわち、前記搬送手段にて搬送される被計測物が前記計測箇所よりも少し搬送方向上手側に位置する箇所に至ると、具体的には、投光部から投射されて受光部に向かう光が通過する光通過箇所に被計測物の搬送方向先頭位置が到達すると、受光センサに蓄積された電荷を放出させる電荷放出動作を２回繰り返して行うようになっており、その電荷放出動作を行った後において被計測物が前記計測箇所に至ると、計測用設定時間としての電荷蓄積時間が経過するまで受光センサに電荷を蓄積させる計測用の電荷蓄積処理を実行して、その蓄積された電荷を取り出して品質評価用の受光情報として用いて被計測物の内部品質情報を求める構成となっている。そして、被計測物の搬送方向先頭位置が前記光通過箇所に到達していない状態においては、受光センサに対して外部からの光が入らないようにシャッター機構を閉じ状態に維持しながら、受光センサが電荷蓄積動作を継続して行う構成となっている（例えば、特許文献１参照。）。
【０００４】
【特許文献１】
特開２００２―１０７２９４号公報（第５−６頁、図５、図６）
【０００５】
【発明が解決しようとする課題】
上記従来構成は、前記搬送手段にて搬送される被計測物が前記計測箇所よりも少し搬送方向上手側に位置する箇所に至ると、計測用の電荷蓄積処理に先立って電荷の放出動作を実行することにより、受光センサに残留電荷が極力残らないようにしたものである。説明を加えると、受光センサは被計測物からの透過光又は反射光を受光して電荷を蓄積する構成であるが、蓄積された電荷を取り出す処理を行った後においても蓄積された電荷の一部が受光センサ内部に残留することがある。このように残留電荷が存在している状態で新たに被計測物からの透過光又は反射光を受光すると、その受光情報に誤差が発生して、受光センサの受光情報に基づく被計測物の内部品質情報にも誤差が生じることになるから、計測用の電荷蓄積処理に先立って電荷の放出動作を実行することにより、このような残留電荷が極力残らないようにしているのである。
【０００６】
しかし、上記従来構成では、搬送手段によって搬送される複数の被計測物が短い時間間隔で計測箇所に到達する状態が継続しているときには、上記したような残留電荷が極力残らないようにして計測処理を行うことができるが、例えば、搬送手段により被計測物が搬送されてくるタイミングが不定期になっており、被計測物が計測箇所に搬送されてくるまでの時間間隔が長くなるような場合があると、被計測物の搬送方向先頭位置が前記光通過箇所に到達していない間は受光センサが電荷蓄積動作を継続して行う構成となっていることから蓄積される電荷が大きくなるおそれがある。
【０００７】
説明を加えると、上述した如く、被計測物の搬送方向先頭位置が前記光通過箇所に到達していない間においては、シャッター機構を閉じ状態にして受光センサに対して外部からの光が入らないようにしているが、このような無光状態においても受光センサにおいては暗電流が発生するものであり、このような暗電流が長い時間にわたって蓄積されると蓄積電荷が大きくなりサチレーションを起こすおそれもある。
【０００８】
しかも、上記従来構成においては、被計測物の搬送方向先頭位置が前記光通過箇所に到達したときから計測用の電荷蓄積処理を実行するまでの短い時間の間に電荷の放出動作を実行する必要があるが、上記したようにサチレーションを起こしていると電荷を充分に放出させることが難しく残留電荷が残る場合がある。そうすると、そのような状況において、受光センサの検出結果に基づいて被計測物の内部品質情報を求めるようにすると内部品質情報に誤差が生じるおそれがあった。
【０００９】
本発明はかかる点に着目してなされたものであり、その目的は、受光センサにおける残留電荷を少なくして極力適正な状態で品質評価用の受光情報を得ることにより、被計測物の内部品質情報に誤差が生じることを回避させることが可能となる果菜類の品質評価装置を提供する点にある。
【００１０】
【課題を解決するための手段】
請求項１に記載の果菜類の品質評価装置は、計測箇所に位置する被計測物としての果菜類に対して光を投射する投光部と、前記被計測物からの透過光又は反射光を電荷蓄積型の受光センサにて受光して品質評価用の受光情報を得る受光部と、前記被計測物を前記計測箇所を経由して搬送する搬送手段と、前記受光部の前記受光情報に基づいて被計測物の内部品質情報を求めるとともに各部の動作を制御する制御手段とを備えて構成されているものであって、前記制御手段が、被計測物が前記計測箇所に存在しないとき及び被計測物が前記計測箇所に存在しても前記品質評価用の受光情報の取得が終了しているときは、蓄電開始タイミングから蓄電用設定時間が経過するまで前記受光センサに電荷を蓄積させ、その後、放電用設定時間が経過するまで前記受光センサに蓄積された電荷を放出させる電荷蓄積放電処理を繰り返し実行し、且つ、前記搬送手段にて搬送される前記被計測物が前記計測箇所に至ると、そのときから放電用設定時間が経過するまで前記受光センサに蓄積された電荷を放出させ、その後、計測用設定時間が経過するまで前記受光センサに前記品質評価用の受光情報として用いるための電荷を蓄積させる計測用電荷蓄積処理を実行するように構成されていることを特徴とする。
【００１１】
すなわち、被計測物は搬送手段によって計測箇所を経由する状態で搬送され、計測箇所に位置するときに前記品質評価用の受光情報が取得されて、その受光情報に基づいて被計測物の内部品質情報が求められることになるのであるが、制御手段は、被計測物が計測箇所に存在しないとき及び被計測物が計測箇所に存在しても品質評価用の受光情報の取得が終了しているときは、蓄電開始タイミングから蓄電用設定時間が経過するまで受光センサに電荷を蓄積させ、その後、放電用設定時間が経過するまで受光センサに蓄積された電荷を放出させる電荷蓄積放電処理を繰り返し実行することになる。つまり、前記計測用電荷蓄積処理を実行していないときには常に電荷蓄積放電処理を繰り返し実行することになるから、蓄積された電荷を放出させる動作が所定の時間間隔をあけて繰り返し行われるので、受光センサに蓄積されている電荷を充分に放出させることができ、電荷を放出させる動作が終了した後においては受光センサの内部に電荷が残留するおそれは少ないものになる。
【００１２】
そして、制御手段は、搬送手段にて搬送される被計測物が計測箇所に至ると、そのときから放電用設定時間が経過するまで受光センサに蓄積された電荷を放出させ、その後、計測用設定時間が経過するまで受光センサに品質評価用の受光情報として用いるための電荷を蓄積させる計測用電荷蓄積処理を実行することになる。この計測用電荷蓄積処理によって蓄積された電荷を品質評価用の受光情報として用いて被計測物の内部品質情報を求めるのである。
【００１３】
又、上述したように電荷蓄積放電処理を繰り返し実行しているときには、電荷を放出させる動作が終了した後においては受光センサの内部に電荷が残留するおそれは少ないので、前記計測用電荷蓄積処理において電荷を放出させる動作を実行した後には、受光センサの内部に電荷が残留するおそれは少なく、被計測物からの透過光又は反射光を受光して受光情報を得る場合に、その受光情報に残留電荷に起因した誤差は少ないものになる。
【００１４】
従って、受光センサにおける残留電荷を少なくして極力適正な状態で品質評価用の受光情報を得ることにより、被計測物の内部品質情報の誤差を少なくすることが可能となる果菜類の品質評価装置を提供できるに至った。
【００１５】
請求項２に記載の果菜類の品質評価装置は、請求項１において、前記被計測物からの透過光又は反射光が前記受光センサにて受光されることを許容する開放状態と受光されることを阻止する遮蔽状態とに切り換え自在な入射状態切換手段が備えられ、前記制御手段が、前記被計測物が前記計測箇所に至ると、前記遮蔽状態から前記開放状態に切り換え、且つ、その開放状態を前記計測用設定時間が経過するまで維持した後に前記遮蔽状態に戻すように前記入射状態切換手段の動作を制御するよう構成されていることを特徴とする。
【００１６】
すなわち、搬送手段にて搬送される被計測物が計測箇所に至ると、入射状態切換手段が透過光又は反射光が受光センサにて受光されることを阻止する遮蔽状態から被計測物からの透過光又は反射光が前記受光センサにて受光されることを許容する開放状態に切り換えられるので、被計測物からの透過光又は反射光を受光センサにて受光することが可能な状態となって前記計測用電荷蓄積処理を適切に実行することができる。そして、前記開放状態に切り換えてから計測用設定時間が経過するまでその開放状態を維持した後に遮蔽状態に戻すことになるから、前記計測用電荷蓄積処理を実行していない状態においては、入射状態切換手段は遮蔽状態が維持されることになる。
【００１７】
従って、前記計測用電荷蓄積処理を実行する間だけ被計測物からの透過光又は反射光が受光センサにて受光され、前記計測用電荷蓄積処理を適切に実行することが可能となり、しかも、電荷蓄積放電処理を繰り返し実行している間においては、被計測物からの透過光又は反射光が受光センサにて受光されることがないので、受光センサの内部に残留電荷が発生することを防止することができる。
【００１８】
請求項３記載の果菜類の品質評価装置は、請求項１又は２において、前記搬送手段が、前記被計測物を受皿上の特定位置に位置させる状態で前記受皿に載置した状態で搬送するように構成され、前記制御手段が、前記受皿の搬送方向の先頭位置が設定位置に到達したことを検出する受皿検出手段を備えて構成され、この受皿検出手段の検出情報に基づいて前記被計測物が前記計測箇所に至ったことを判別するように構成されていることを特徴とする。
【００１９】
すなわち、被計測物は受皿上の特定位置に位置させる状態で前記受皿に載置した状態で搬送される。そして、このように受皿に載置した状態で被計測物が搬送される場合に、受皿の搬送方向の先頭位置が設定位置に到達したことを受皿検出手段によって検出するようにして、この受皿検出手段の検出情報に基づいて被計測物が前記計測箇所に至ったことを判別するようにしている。
【００２０】
例えば、前記設定位置と前記計測箇所との相対位置関係と、受皿の先頭位置と前記特定位置との間の相対位置関係とを対応付けておくと、受皿検出手段にて受皿の搬送方向の先頭位置が設定位置に到達したことが検出されるに伴って、直ちに被計測物が前記計測箇所に至ったことを判別する構成としたり、又、受皿検出手段にて受皿の搬送方向の先頭位置が設定位置に到達したことが検出されてから、前記計測箇所に搬送されるまでの所要時間が経過した後に被計測物が前記計測箇所に至ったことを判別する構成等がある。
【００２１】
このように受皿上での被計測物の載置位置が特定されるので、受皿の先頭位置と被計測物との相対位置関係は被計測物の大きさにかかわらずほぼ一定となる。つまり、被計測物が小さい場合であっても受皿の先頭位置と被計測物との相対位置関係は同じであるから、受皿検出手段により受皿の搬送方向の先頭位置が設定位置に到達したことを検出したときの被計測物の位置は、被計測物の大きさにかかわらず常に同じ相対位置関係になる。従って、受皿検出手段の検出情報に基づいて被計測物が計測箇所に至ったことを判別することが可能となるのであり、しかも、被計測物が小さい場合であっても被計測物が計測箇所に至ったことを適正に判別することが可能となる。
【００２２】
請求項４記載の果菜類の品質評価装置は、請求項１又は２において、前記制御手段が、前記搬送手段にて搬送される被計測物の搬送方向の先頭位置が前記計測箇所よりも搬送方向上手側に位置する手前側位置に到達したことを検出する被計測物検出手段と、前記搬送手段による前記被計測物の搬送距離を計測する搬送距離計測手段とを備えて構成され、前記被計測物検出手段の検出情報に基づいて前記被計測物の前記先頭位置が前記手前側位置に到達したことを検出してから前記搬送距離計測手段の検出情報に基づいて前記被計測物が前記計測箇所に至ったことを判別するように構成されていることを特徴とする。
【００２３】
すなわち、被計測物の先頭位置が前記手前側位置に到達したことを検出してから、搬送距離計測手段の検出情報に基づいて被計測物が手前側位置から計測箇所にまで搬送されたことが検出されると、被計測物が計測箇所に至ったものと判別するようにしている。説明を加えると、搬送手段にて搬送される被計測物の搬送方向の先頭位置が計測箇所よりも搬送方向上手側に位置する手前側位置に到達したことが被計測物検出手段により検出されると、その時点から以降の被計測物の搬送距離が、手前側位置から計測箇所に至るまでの距離に相当する距離であることが搬送距離計測手段の検出情報に基づいて判別されると、その判別結果に基づいて被計測物が計測箇所に至ったことを判別するようにしているのである。従って、受皿に載置しない状態で搬送される被計測物であっても適切に計測箇所に至ったことを判別することが可能となる。
【００２４】
【発明の実施の形態】
【００２５】
（第１実施形態）
以下、本発明に係る果菜類の品質評価装置の第１実施形態を図面に基づいて説明する。
本発明に係る果菜類の品質評価装置は、被計測物として例えば蜜柑等の果菜類の品質としての糖度や酸度を計測するための装置であり、計測箇所に位置する被計測物としての果菜類に対して光を投射する投光部と、前記被計測物からの透過光を電荷蓄積型の受光センサにて受光して品質評価用の受光情報を得る受光部と、被計測物を計測箇所を経由して搬送する搬送手段と、受光部の受光情報に基づいて被計測物の内部品質情報を求めるとともに各部の動作を制御する制御手段とを備えて構成されている。
【００２６】
詳述すると、図１に示すように、品質評価装置は、被計測物Ｍに光を照射する投光部１と、被計測物Ｍを透過した光を受光し、その受光した光を計測する受光部２と、各種の制御処理を実行するマイクロコンピュータ利用の制御部３等を備えて構成され、被計測物Ｍは、搬送手段としての搬送コンベア４により一列で縦列状に載置搬送される構成となっており、本装置による計測箇所を順次、通過していくように構成されている。そして、計測箇所に位置する被計測物Ｍに対して、投光部１から投射した光が被計測物Ｍを透過した後に受光部２にて受光される状態で、投光部１と受光部２とが、計測個所の左右両側部に、すなわち、搬送コンベア４の搬送横幅方向の両側部に振り分けて配置される構成となっている。
【００２７】
次に、前記投光部１の構成について説明する。
この投光部１は、２個の光源を備えるとともに、その２個の光源からの光を互いに異なる照射用の光軸にて計測箇所に位置する被計測物に照射するように構成されている。又、各光源による２本の照射用の光軸が計測箇所に位置する被計測物の表面部又はその近傍にて交差するように構成されている。
すなわち、図４及び図８に示すように、搬送コンベア４による搬送方向に沿って離間させた２個のハロゲンランプからなる光源５が設けられ、これら２個の光源５の夫々に対応させて次のような光学系が備えられている。つまり、光源５が発光する光を反射させて被計測物Ｍの表面に焦点を合わせるための集光手段としての凹面形状の光反射板６が備えられ、この光反射板６にて集光される光の焦点位置近くに対応するように位置させて、大きめの絞り孔７ａを通過させることで集光された後の光の径方向外方側への広がりを抑制する絞り板７、絞り板７を通過した光を通過させる状態、小さめの絞り孔８ａを通して通過させる状態、及び、光を遮断する状態の夫々に切り換え自在な光量調節板８、集光された光源５からの光を並行光に変更させるコリメータレンズ９、並行光に変化した光を反射して屈曲させる反射板１０、この反射板１０にて反射された光を集光させる集光レンズ１１の夫々が１個の光源５に対する光学系として備えられている。前記各光量調節板８は、投光量調整用モータ１２によって一体的に揺動操作され、前記各状態に切り換え自在に構成されている。
【００２８】
そして、この投光部１は上記したような各部材がケーシング１３に内装されてユニット状に組み立てられた構成となっている。又、計測箇所に位置する被計測物に対して斜め下方に向かう状態で光を照射するように、投光部１が斜め姿勢で備えられており、外形寸法が小さい被計測物であっても受光部２に直接光が入らないようにしている。
【００２９】
次に、受光部２の構成について説明する。
この受光部２は、図４に示すように、被計測物Ｍを透過した光を集光する集光レンズ１４、並行光に変化した光のうち近赤外域である波長領域６８０〜９９０ナノメートル（ｎｍ）の範囲の光だけを上向きに反射し、それ以外の波長の光をそのまま通過させるバンドパスミラー１５、バンドパスミラー１５により上向きに反射された計測対象光を集光させる集光レンズ１６、集光レンズ１６を通過した光をそのまま通過させて受光センサにて受光されることを許容する開放状態と受光されることを阻止する遮蔽状態とに切り換え自在な入射状態切換手段としてのシャッター機構１７、開放状態のシャッター機構１７を通過した光が入射されると、その光を分光して前記分光スペクトルデータを計測する分光器１８等を備えて構成されている。尚、シャッター機構１７の下方側、つまり光入射方向上手側箇所には、分光器に入射される光に対して作用する光量調整用の複数の各種のフィルターを切り換えるフィルター切り換え機構Ｅが備えられている。
【００３０】
前記分光器１８は、図６に示すように、受光位置である入光口２０から入射した計測対象光を反射する反射鏡２１と、反射された計測対象光を複数の波長の光に分光する分光手段としての凹面回折格子２２と、凹面回折格子２２によって分光された計測対象光における各波長毎の光量を検出することにより分光スペクトルデータを計測する受光センサ２３とが、外部からの光を遮光する遮光性材料からなる暗箱２４内に配置される構成となっている。前記受光センサ２３は、凹面回折格子２２にて分光反射された光を同時に各波長毎に受光するとともに波長毎の信号に変換して出力する、１０２４の単位受光部を備えた電荷蓄積型のＣＣＤラインセンサにて構成されている。このラインセンサは、詳述はしないが、各単位受光部毎に光量を電気信号（電荷）に変換する光電変換部と、その光電変換部にて得られた電荷を蓄積する電荷蓄積部、及び、その蓄積電荷を外部に出力させるための駆動回路等が備えた半導体基板上に形成されている。
【００３１】
又、前記シャッター機構１７は、図６、図７に示すように、放射状に複数のスリット２５が形成された円板１７Ａを、パルスモータ１７Ｂによって縦軸芯周りで回転操作される状態で備えて構成され、前記暗箱２４の入光口２０には前記各スリット２５が上下に重なると光を通過させる開放状態となり、スリット２５の位置がずれると光を遮断する遮断状態となるように、スリット２５とほぼ同じ形状の透過孔２７が形成されており、光の漏洩がないように暗箱の入光口２０に対して円板１７Ａを密接状態で摺動する状態で配備して構成されている。すなわち、このシャッター機構１７は凹面回折格子２２に対する入光口２０に近接する状態で設けられている。この受光部２も投光部１と同様にして、上記したような各部材がケーシング２８に内装されてユニット状に組み立てられた構成となっている。
【００３２】
そして、投光部１及び受光部２の夫々が、投光用箇所及び受光用箇所の夫々に対して各別に着脱自在に取り付け可能なユニット状に構成されており、投光部１と受光部２とが着脱自在に取付けられる装置枠体Ｆが、計測箇所における搬送コンベア４の左右両側に相当する箇所を投光用箇所及び受光用箇所とするように、投光部１と受光部２に対する一対の取付部を備える状態で設けられている。
更には、前記装置枠体Ｆには、投光部１及び受光部２を一体的に上下方向に位置調節自在な上下位置調節手段としての上下位置調節機構２９、及び、投光部１及び受光部２の夫々を各別に装置枠体Ｆに対して計測箇所に位置する被計測物に接近並びに離間する方向、すなわち、水平方向であって搬送コンベア４の搬送方向と直交する方向に沿って位置調節自在な水平位置調節手段としての水平位置調節機構３０が備えられている。
【００３３】
次に、前記上下位置調節機構２９について説明する。図１〜図５に示すように、品質評価装置の外周部を囲うように矩形枠状に組み付けられた装置枠体Ｆが備えられ、その装置枠体Ｆの上部側箇所から位置固定状態で４本の固定支持棒３１が垂下される状態で設けられ、これら４本の固定支持棒３１の下端部には後述する品質評価装置校正用の被計測体Ａを載置支持するための支持台３２が取り付けられている。そして、この４本の固定支持棒３１に対して４箇所の摺動支持部３３により上下方向にスライド移動自在に昇降台３４が支持されている。又、装置枠体Ｆの上部側箇所から垂下状態に支持された送りネジ３５が電動モータ３６にて回動自在に設けられ、昇降台３４に備えられた雌ネジ部材３７がこの送りネジ３５に螺合しており、送りネジ３５を電動モータ３６にて回動操作することで昇降台３４が任意の位置に上下移動調節可能な構成となっている。尚、送りネジ３５は手動操作ハンドル３８でも回動自在に構成されている。
又、前記昇降台３４には、品質評価装置校正用の被計測体Ａが支持台３２に載置支持された状態でも昇降操作可能なように品質評価装置校正用の被計測体Ａが上下方向に通過することを許容する挿通孔３４ａが形成されている。
【００３４】
次に、水平位置調節機構３０について説明する。
前記昇降台３４には、図３に示すように、投光部１と受光部２との並び方向に沿って延びる２本のガイド棒３９が設けられており、ユニット状に組み付けられた投光部１並びに受光部２の夫々が着脱自在に取付けられる前記一対の取付部としての支持部材４０、４１が各ガイド棒３９にスライド移動自在に支持される構成となっている。前記各ガイド棒３９は長手方向両端側で連結具３９ａにて連結されている。又、前記昇降台３４には、投光部１と受光部２との並び方向に沿って延びる２本の送りネジ４２、４３が夫々電動モータ４４、４５によって回動操作可能に設けられ、各支持部材４０、４１に備えられた雌ネジ部４６、４７が各送りネジ４２、４３に螺合しており、電動モータ４４、４５にて前記各送りネジ４２、４３を各別に正逆回動させることで、前記各支持部材４０、４１が各別に搬送コンベア４の搬送方向と直交する水平方向に沿って位置調節可能な構成となっている。従って、各支持部材４０、４１に夫々各別に取付けられる投光部１及び受光部２は電動モータ４４、４５にて前記各送りネジ４２、４３を各別に正逆回動させることで前記水平方向、すなわち、計測箇所に対して接近並びに離間する方向での相対位置を変更調節することが可能となる。
【００３５】
従って、電動モータ３６にて送りネジ３５を回動操作させると昇降台３４が上下移動調節されるが、それに伴って昇降台３４に支持されている投光部１及び受光部２を一体的に上下移動調節することができ、前記各電動モータ４４、４５を回動操作させることで投光部１及び受光部２が各別に搬送コンベア４の搬送方向と直交する水平方向に沿って位置調節することができる。
【００３６】
前記各支持部材４０、４１に対する投光部１及び受光部２の取付けの構成について説明を加えると、前記各支持部材４０、４１の下端部における取付け用の台座部分４０ａ，４１ａには、水平方向に適宜間隔をあけて横向きに突出する複数の位置決め用突起４０ｂ，４１ｂが形成され、ユニット状に設けられた投光部１及び受光部２に夫々、それらの位置決め用突起４０ｂ，４１ｂに対応する位置決め孔が設けられ、各支持部材４０、４１に対して投光部１及び受光部２を取付けるときは、図５、図６に示すように、位置決め用突起４０ｂ，４１ｂを位置決め孔に嵌め合わせて位置決めした状態でその近くの適宜箇所をボルト止めすることで投光部１及び受光部２を取付ける構成となっている。従って、この装置においては、投光部１及び受光部２が夫々取付けられた状態においては、投光部１が位置する投光用箇所、計測箇所、及び、受光部２が位置する受光用箇所の夫々が一直線状に位置する形態で投光部１及び受光部２が配置される状態となる。但し、支持部材４０、４１の下端部における取付け用の台座部分４０ａ，４１ａは、投光部１及び受光部２の上下方向の長さに対応するように左右で少し長さが異なるものを用いるようにしている。又、投光部１の取付け部には、投射方向が少し斜め下方となるように傾斜用の姿勢規制具４０ｃを設けている。
【００３７】
搬送コンベア４における被計測物Ｍの計測箇所の上方側に位置させて、前記支持台３２から下方側に延設した支持アーム４８により支持される状態でリファレンスフィルター４９が設けられている。このリファレンスフィルター４９は、所定の吸光度特性を有する光学フィルターで構成され、具体的には、一対のオパールガラスを備えて構成されている。
【００３８】
上下位置調節機構２９によって投光部１及び受光部２を一体的に上下移動調節することによって、図１に示すように、投光部１からの光が搬送コンベア４に載置される被計測物Ｍを透過した後に受光部２にて受光される通常計測状態と、図４の仮想線にて示すように、各投光部１からの光が前記リファレンスフィルター４９を透過した後に受光部２にて受光されるリファレンス計測状態、及び、図３の実線にて示すような校正用計測状態の夫々に切り換えることができるように構成されている。
尚、詳述はしないが、この品質評価装置の外周部は、被計測物の搬送に伴う通過箇所を除いて装置枠体Ｆに備えられた壁体によって囲われて外部から光が入り込まないようになっている。
【００３９】
そして、この品質評価装置には、前記支持台３２に被計測物の光透過特性とほぼ同じような特性を有する擬似計測体Ａを取り外し自在に装着できる構成となっている。尚、被計測体Ａは支持台３２にそのまま位置決めした状態で載置させる構成であり、容易に着脱可能な構成となっており、校正を行わないときには、被計測体Ａを支持台３２から取り外しておくことができる。
【００４０】
この品質評価装置校正用の被計測体Ａについて簡単に説明すると、図４に示すように、非透光性の部材で構成された略四角柱状の外側ケーシング５２によって外周部が覆われ、この外側ケーシング５２内部の下方側に位置する箇所に品質評価対象としての純水Ｊを封入状態で収納する収納部５１が設けられ、この収納部５１と外側ケーシング５２との間に空気層が形成されている。そして、この空気層の温度が、品質評価装置によって品質が評価されるときの被計測物の温度又はそれに近い温度である設定温度（例えば、３０℃）に維持されるようにペルチェ素子５５を作用させる構成となっている。そして、外側ケーシング５２における収納部５１の左右両側箇所に対応する位置に夫々、光通過部６１と光通過部６２とが形成され、非透光性の部材で構成された外側ケーシング５２の入光側光通過部６１及び出光側光通過部６２に対応する位置に通過孔が形成されるとともに、拡散体としてのオパールガラスＧが気密状態に保持される状態で装着されている。
【００４１】
そして、図１０に示すように、前記搬送コンベア４は無端回動帯４ａを電動モータ４ｂによって駆動する構成となっており、その無端回動帯４ａを巻回する回転体４ｃの回転軸の回転状態にて搬送コンベアによる搬送距離を検出する搬送距離計測手段としてのロータリーエンコーダ１９が備えられ、このロータリーエンコーダ１９の検出情報も制御部３に入力される構成となっており、更に、搬送コンベア４による計測箇所の搬送方向上手側箇所には、搬送コンベア４にて搬送される被計測物の搬送方向の先頭位置が計測箇所よりも搬送方向上手側に位置する手前側位置に到達したか否かを検出する被計測物検出手段としての光学式の通過検出センサ５０が備えられている。この通過検出センサ５０は、光を発する発光器５０ａと、その光を受光する受光器５０ｂとが、搬送コンベア４による搬送経路の左右両側部に振り分け配置され、発光器５０ａから発する光が被検出物で遮断されて受光器５０ｂにて受光できなくなると被検出物が存在していると判別することができる構成となっている。
【００４２】
前記制御部３は、マイクロコンピュータを利用して構成してあり、図９に示すように、前記通過検出センサ５０、受光センサ２３の検出情報に基づいて被計測物の内部品質を求めるとともに各部の動作を制御する構成となっている。この制御部３は、後述するような公知技術である分光分析手法を用いて被計測物Ｍの内部品質を解析する演算処理を実行するとともに、受光センサ２３、シャッター機構１７、投光量調整用モータ１２、上下位置調節用モータ３６、水平位置調節用モータ４４、４５の動作の管理等の各部の動作を制御する構成となっている。
【００４３】
次に、制御部３による制御動作について説明する。
制御部３は、投光部１からの光を被計測物Ｍに代えて前記リファレンスフィルター４９に照射して、そのリファレンスフィルター４９からの透過光を、受光部２にて分光してその分光した光を受光して得られた分光スペクトルデータを基準分光スペクトルデータとして求める基準データ計測処理、搬送コンベア４により搬送される被計測物Ｍに対して、投光部１から光を照射して計測分光スペクトルデータを得て、この計測分光スペクトルデータと前記基準分光スペクトルデータとに基づいて、被計測物Ｍの内部品質を解析する通常データ計測処理の夫々を実行するように構成されている。
【００４４】
前記基準データ計測処理について説明する。
搬送コンベア４による被計測物Ｍの搬送を停止させている状態で、上下位置調節機構２９によって前記リファレンス計測状態に切り換え、シャッター機構１７を開放状態に切り換えて、投光部１からの光を被計測物Ｍに代えて前記リファレンスフィルター４９に照射して、そのリファレンスフィルター４９からの透過光を、受光部２にて分光してその分光した光を受光して得られた分光スペクトルデータを基準分光スペクトルデータとして計測する。又、受光部２への光が遮断された無光状態での受光センサ１８の検出値（暗電流データ）も計測される。すなわち、前記受光部２のシャッター機構１７を遮蔽状態に切り換えて、そのときの受光センサ１８の単位画素毎における検出値を暗電流データとして求めるようにしている。
【００４５】
次に、通常データ計測処理について説明する。
この通常データ計測処理においては、上下位置調節機構２９、具体的には上下位置調整用電動モータ３６を操作して昇降台３４を通常計測状態に切り換えて、搬送コンベア４による被計測物Ｍの搬送を行う。そして、被計測物が計測箇所に存在しないとき及び被計測物が前記計測箇所に存在しても後述するような品質評価用の受光情報の取得が終了しているときは、蓄電開始タイミングから蓄電用設定時間が経過するまで受光センサ２３に電荷を蓄積させ、その後、放電用設定時間が経過するまで受光センサ２３に蓄積された電荷を放出させる電荷蓄積放電処理を繰り返し実行し、且つ、搬送コンベア４にて搬送される被計測物が計測箇所に至ると、そのときから放電用設定時間が経過するまで受光センサ２３に蓄積された電荷を放出させ、その後、計測用設定時間が経過するまで受光センサ２３に品質評価用の受光情報として用いるための電荷を蓄積させる計測用電荷蓄積処理を実行するように構成されている。
【００４６】
つまり、制御部３は、図１２に示すように、被計測物が計測箇所に存在しないとき及び被計測物が前記計測箇所に存在しても後述するような品質評価用の受光情報の取得が終了しているときは、常に、蓄電開始タイミングから蓄電用設定時間（約４０ｍｓｅｃ）が経過するまで受光センサ２３に電荷を蓄積させ、その後、放電用設定時間（約１０ｍｓｅｃ）が経過するまで受光センサ２３に蓄積された電荷を放出させる電荷蓄積放電処理を設定周期Ｔ１（約５０ｍｓｅｃ）毎に繰り返し実行するように受光センサ２３の動作を制御するように構成されている。
【００４７】
そして、制御部３は、通過検出センサ５０の検出情報に基づいて被計測物の先頭位置が手前側位置に到達したことを検出してから、前記ロータリーエンコーダ１９の検出情報に基づいて被計測物が計測箇所に至ったことを判別するように構成されている。説明を加えると、通過検出センサ５０にて被計測物Ｍの搬送方向先頭位置が通過検出センサ５０の検出位置である手前側箇所に来たことが検出されると、ロータリーエンコーダ１９の検出情報に基づいて、その時点からの被計測物の搬送距離が前記手前側箇所から計測箇所に至るまでの搬送距離になったか否かを判別する。そして、その搬送距離になると被計測物Ｍが計測箇所に至ったものと判別することになる。
【００４８】
このように被計測物Ｍが計測箇所に至ったものと判別すると、図１２に示すように、前記電荷蓄積放電処理を繰り返し実行するのではなく、その時点から放電用設定時間が経過するまで受光センサ２３に蓄積された電荷を放出させ、その後、計測用設定時間が経過するまで受光センサ２３に品質評価用の受光情報として用いるための電荷を蓄積させる計測用電荷蓄積処理を実行することになる。又、制御部３は、このような受光センサ２３の動作切り換えと併行して、被計測物が前記計測箇所に至るとシャッター機構１７を遮蔽状態から開放状態に切り換え、且つ、その開放状態を電荷蓄積を行うためのシャッター開放時間Ｔ２が経過するまで維持した後に遮蔽状態に戻すようにシャッター機構１７の動作を制御するよう構成されている。このようにシャッター機構１７が開放されている間において、前記計測用設定時間が経過するまで投光部１から照射され被計測物を透過した光を受光部２にて分光した光を受光センサ２３にて受光して電荷を蓄積することができる。つまり、シャッター機構１７は、放電用設定時間と計測用設定時間とを合せた時間であり、図１２に示す例では、放電用設定時間としては、被計測物が計測箇所に至った後に投光部１からの回り込み光が受光部２に直接入射しない程度の位置まで被計測物が移動するのに要する時間、例えば、約１０ｍｓｅｃに設定される。又、計測用設定時間は約４０ｍｓｅｃであり、シャッター開放時間Ｔ２は約５０ｍｓｅｃの例を示している。そして、このシャッター開放時間Ｔ２が経過した後に、蓄積された電荷を取り出して品質評価用の受光情報としての計測分光スペクトルデータを得ることになる。
【００４９】
尚、前記計測用設定時間は、被計測物の品種の違い等に応じて変更されることになる。説明を加えると、例えば、林檎等であれば光が透過し難いので長めの時間（上記したように４０ｍｓｅｃ程度）に設定する。又、温州蜜柑などのように光が比較的透過しやすいものであれば比較的短い時間（１０ｍｓｅｃ程度）に設定する。尚、搬送コンベア４の搬送速度は被計測物の大きさや上記したような計測用の時間等を考慮して適宜設定される。つまり、林檎の場合には、蓄電用設定時間（約４０ｍｓｅｃ）が電荷蓄積放電処理の蓄電用設定時間とほぼ同じであり蓄積可能な最大の時間が設定され、温州蜜柑の場合にはそれよりも短い時間が設定される。
【００５０】
このような品種の違いによる動作条件の設定は、手動による切り換えを行うのではなく自動的に行う構成となっている。つまり、この実施形態では、図１０に示すように、この品質評価装置とは別に、搬送コンベア４の搬送方向上手側箇所に、搬送されてくる被計測物の外観を検査する外観検査装置ＧＫが配備されており、この外観検査装置ＧＫの検出結果を利用して品種を判別して自動的に品種の違いによる動作条件の設定を行うようにしている。前記外観検査装置ＧＫは、図１１に示すように、遮蔽カバー８０の内部に被計測物を撮像するカラー式ビデオカメラＶＣが備えられており、そのビデオカメラＶＣにて撮像した画像情報に対して周知の画像処理手法を用いて、外形寸法や色ムラ等の外観異常の有無などを判別する構成となっており、これらの情報も品質評価装置の評価結果と合わせて果菜類のランク分けに利用される構成となっている。尚、被計測物を間接的に照明する照明装置８１や被計測物の側面を撮影するための反射鏡８２も備えられている。そして、制御部３は、外観検査装置ＧＫからの計測結果を受信して品種を判別して、判別結果に基づいて計測用設定時間を変更調整する構成となっている。
【００５１】
そして、このようにして得られた基準分光スペクトルデータ、暗電流データ及び計測分光スペクトルデータに基づいて公知技術である分光分析手法を用いて被計測物Ｍの内部品質を解析する演算処理を実行するように構成されている。
つまり、上記したようにして得られた、前記基準データ計測モードにて求められた基準分光スペクトルデータ、及び、暗電流データを用いて正規化して、分光された各波長毎の吸光度スペクトルデータを得るとともに、その吸光度スペクトルデータの二次微分値を求める。具体的には、受光センサ２３の単位受光部毎に得られた受光情報に対応する吸光度スペクトルデータを得ることになる。このように求められた吸光度スペクトルデータの二次微分値のうち成分を算出するための特定波長の二次微分値と予め設定されている検量式とにより、被計測物Ｍに含まれる糖度に対応する成分量や酸度に対応する品質評価値としての成分量を算出する品質評価処理を実行するように構成されている。
【００５２】
従って、この実施形態では、前記制御部３、通過検出センサ５０及びロータリーエンコーダ１９により、受光部２の前記受光情報に基づいて被計測物の内部品質情報を求めるとともに各部の動作を制御する制御手段Ｈが構成されることになる。
【００５３】
前記吸光度スペクトルデータｄは、基準分光スペクトルデータをＲｄ、計測分光スペクトルデータをＳｄとし、暗電流データをＤａとすると、
【００５４】
【数１】
ｄ＝ｌｏｇ［（Ｒｄ−Ｄａ）／（Ｓｄ−Ｄａ）］
【００５５】
という演算式にて求められる。そして、このようにして得られた吸光度スペクトルデータｄを二次微分した値のうち特定波長の値と、下記の数２に示されるような検量式とを用いて、被計測物Ｍに含まれる糖度や酸度に対応する成分量を算出するための検量値を求めるのである。
【００５６】
【数２】
Ｙ＝Ｋ０＋Ｋ１・Ａ（λ１）＋Ｋ２・Ａ（λ２）
【００５７】
但し、
Ｙ ；成分量に対応する検量値
Ｋ０，Ｋ１，Ｋ２ ；係数
Ａ（λ１ ），Ａ（λ２ ） ；特定波長λにおける吸光度スペクトルの二次微分値
【００５８】
尚、成分量を算出する成分毎に、特定の検量式、特定の係数Ｋ０，Ｋ１，Ｋ２、及び、波長λ１，λ２等が予め設定されて記憶されており、演算手段１００は、この成分毎に特定の検量式を用いて各成分の検量値（成分量）を算出する構成となっている。
【００５９】
次に検量式を作成する手順について説明する。
検量式は、被計測物に対する計測処理に先立って、予め、計測対象である被計測物と同じようなサンプルを実測したデータに基づいて装置毎に個別に設定されることになる。つまり、上述したような複数の品種の果菜類を計測対象としている場合には、異なる品種毎に夫々各別に検量式を作成して、夫々を記憶させておくことになる。
【００６０】
先ず、前記サンプルとして数十個〜数百個の被計測物を用意して、各サンプルについて前記分光分析装置を用いて各波長毎の分光スペクトルデータを求め、さらに、その分光スペクトルデータから上記したような吸光度スペクトルデータを求める。このようにして求められた吸光度スペクトルデータは、受光センサ２３の１０２４個の単位受光部毎に得られたデータである。そして、前記各サンプルについて、例えば破壊分析等に基づいて被計測物の化学成分を特別な検査装置によって精度よく検出する実成分量の検出処理を実行して、被計測物の実成分量を得る。そして、上記したようにして得られた各サンプル毎の吸光度スペクトルデータを用いて、前記実成分量の検出結果と対比させながら、重回帰分析の手法を用いて、吸光度スペクトルデータと特定の成分についての成分量との関係を示す前記検量式を求めるのである。
上記したように複数の品種に応じて複数の検量式が記憶されている場合、制御部３が計測処理に際してどの検量式を利用するかについては、上記したような外観検査装置からの計測結果に基づく計測用設定時間Ｔ４の変更調整と同様にそれに合わせて自動で行われることになる。
【００６１】
〔第２実施形態〕
次に、本発明に係る第２実施形態について説明する。
この実施形態の品質評価装置は、投光部１と受光部２との配置構成、受光部２に対する光の通過経路構成、搬送コンベアの構成、受光センサ２３の計測方法が異なる他は、第１実施形態の品質評価装置の構成と同じであるから、異なる構成についてのみ説明し、同じ構成については説明は省略する。又、投光部１及び受光部２は、夫々、ユニット状に組み立てられる構成であり、第１実施形態に使用されるものとほぼ同じ構成のものを使用する構成となっている。
【００６２】
図１３に示すように、第１実施形態における投光部１と同じ構成のユニット状の投光部１が２台備えられ、それら２台の投光部１が計測箇所の左右両側部、すなわち、搬送コンベア４ａの搬送横幅方向の両側部に振り分けて配置され、各投光部１は光の照射方向がほぼ水平方向となるように構成されている。すなわち、前記各支持部材４０、４１と同様な支持部材４０、４１にユニット状の２台の投光部１が夫々取付けられる。但し、支持部材４０、４１の下端部における取付け用の台座部分４０ａ，４１ａは、投光部１の上下長さに対応するように左右で同じものを用いるようにしている。又、各投光部１の光の照射方向がほぼ水平方向となるように、上記品質評価装置にて用いた傾斜用の姿勢規制具４０ｃは使用しない構成となっている。
【００６３】
搬送コンベア４Ａは、被計測物を中央部に挿通孔７０が形成された受皿７１に載置した状態で搬送される構成となっており、この受皿７１は、計測箇所の下方側には、前記投光部１から照射されて被計測物を透過して受皿７１の挿通孔７０を通して下方側に透過する光を受光する光ファイバー７２の受光側端部が配置されている。その光ファイバー７２の他端側には、前記受光部２とほぼ同じ構成のユニット状の受光部２が接続されて光が受光されることになる。この受光部２による受光情報に基づく制御部３での内部品質の解析処理については第１実施形態の場合と同様である。
【００６４】
この品質評価装置においては、計測箇所に位置する被計測物に対して、その左右両側部に位置する各投光部１から光がほぼ水平方向に対向するように投射され、被計測物内部で散乱して下方側に透過して出て来た光を光ファイバー７２にて受光して受光部２に導く構成となっている。
【００６５】
そして、前記搬送コンベア４Ａは、被計測物Ｍを受皿７１上の特定位置に位置させる状態で受皿７１に載置した状態で搬送するように構成されている。つまり、受皿７１はゴム等の軟質材からなり、図１４に示すように、外形形状が平面視で円筒形であり中央部に円形の挿通孔７０が形成され、挿通孔７０の外周側の上面側部分は中心側ほど下方に位置する斜め形状になるように構成され、計測対象となる被計測物Ｍである桃、梨、林檎等の略球形状の果菜類が、受皿７１上に載置されると自重でその軸芯が平面視で中央部の挿通孔７０とほぼ同じ軸芯上に位置する状態で載置されることになる。つまり、受皿７１上の中心位置が前記特定位置に対応するものとなる。
前記受皿７１は搬送コンベア４Ａの無端回動帯４ｄ上に載置されるフリーキャリア式の受皿であり、無端回動帯４ｄに搬送方向に所定間隔をあけて設けられた押し具４ｅにより押し操作しながら搬送するようになっており、搬送横幅方向の両端部は搬送方向に配備された規制具４ｆにより案内される構成となっている。又、無端回動帯４ｄの幅方向中央部の受皿７１の下方側部分は、投光部１から照射されて被計測物Ｍを透過した光を光ファイバー７２の受光側端部にて受光可能なように開放される構成となっている。
【００６６】
この実施形態では、図１５に示すように、受皿７１の搬送方向の先頭位置が設定位置に到達したことを検出する受皿検出手段としての光学式の受皿検出センサ７３が設けられている。この受皿検出センサ７３は、第１実施形態の通過検出センサ５０と同様に、光を発する発光器７３ａと、その光を受光する受光器７３ｂとが、搬送コンベア４Ａによる搬送経路の左右両側部に振り分け配置され、発光器７３ａから発する光が被検出物としての受皿７１により遮断されて受光器７３ｂにて受光できなくなると、受皿７１の搬送方向の先頭位置が設定位置に到達したことを検出する構成となっている。
【００６７】
そして、前記制御部３が、この受皿検出センサ７３の検出情報に基づいて被計測物Ｍが計測箇所に至ったことを判別するように構成されている。すなわち、受皿検出センサ７３が受皿７１の搬送方向の先頭位置が設定位置に到達したことを検出すると、被計測物Ｍが計測箇所に至ったものと判別して、直ちに、上記第１実施形態における計測用電荷蓄積処理と同じ計測用電荷蓄積処理を実行するように構成されている。
【００６８】
説明を加えると、受皿検出センサ７３にて受皿の搬送方向の先頭位置が設定位置に到達したことが検出されたときには、光ファイバー７２の受光側端部が平面視にて挿通孔７０の搬送方向上手側箇所に位置するように、受皿検出センサ７３と光ファイバー７２の受光側端部との位置関係が予め設定されている。因みに、前記各投光部１は光ファイバー７２の受光側端部に対して搬送横幅方向にほぼ直線状に並ぶように配置させる構成となっている。
受皿検出センサ７３にて受皿の搬送方向の先頭位置が設定位置に到達したことが検出されると、直ちに計測用電荷蓄積処理を実行することで、被計測物からの透過光を光ファイバー７２の受光側端部にて適正に受光することができるのである。
【００６９】
そして、制御部３は、図１６のタイムチャートに示すように、前記受皿検出センサ７３にて受皿７１の搬送方向の先頭位置が設定位置に到達したことが検出されると、直ちに、前記計測用電荷蓄積処理を実行するとともに、それと併行して、前記シャッター機構１７を遮蔽状態から開放状態に切り換え、且つ、その開放状態をシャッター開放時間Ｔ４が経過するまで維持した後に遮蔽状態に戻すようにシャッター機構１７の動作を制御する構成となっている。
この構成においては、受皿検出センサ７３にて受皿７１の搬送方向の先頭位置が設定位置に到達したことが検出されると、直ちに、前記計測用電荷蓄積処理を実行する構成であるから、搬送コンベア４Ａの搬送速度の変動等の影響を受けることなく搬送コンベアのスベリや揺らぎに起因した計測誤差を少なくして被計測物が計測箇所に至ったことを精度よく検出できる利点がある。
【００７０】
この実施形態においては、制御部３と受皿検出センサ７３とにより、受光部２の前記受光情報に基づいて被計測物の内部品質情報を求めるとともに各部の動作を制御する制御手段Ｈが構成されることになる。
【００７１】
尚、この実施形態においても、第１実施形態と同様に、制御部３は、図１６に示すように、被計測物が計測箇所に存在しないとき及び被計測物が前記計測箇所に存在しても上述したような品質評価用の受光情報の取得が終了しているときは、常に、蓄電開始タイミングから蓄電用設定時間が経過するまで受光センサ２３に電荷を蓄積させ、その後、放電用設定時間が経過するまで受光センサに蓄積された電荷を放出させる電荷蓄積放電処理を設定周期Ｔ３毎に繰り返し実行するように受光センサ２３の動作を制御するように構成されている。
【００７２】
〔別実施形態〕
以下、別実施形態を列記する。
【００７３】
（１）上記第１実施形態では、前記被計測物検出手段としての通過検出センサの検出情報に基づいて被計測物の先頭位置が手前側位置に到達したことを検出してから搬送距離計測手段としてのロータリーエンコーダの検出情報に基づいて被計測物が計測箇所に至ったことを判別する構成としたが、このような構成に代えて次のように構成するものでもよい。
つまり、前記通過検出センサによって被計測物が計測箇所に至ったか否かを直接検出する構成としてもよい。つまり、通過検出センサにて被計測物の搬送方向上手側箇所を検出する検出位置を、受光センサによる受光箇所よりも少しだけ搬送方向上手側に位置させて、通過検出センサによって被計測物の搬送方向上手側箇所が検出されると、直ちに、前記計測用電荷蓄積処理を実行する構成である。
【００７４】
（２）上記第１実施形態では、前記被計測物検出手段としての通過検出センサを備えて被計測物を直接検出して、その検出結果に基づいて被計測物が計測箇所に至ったことを判別するようにしたが、このような構成に限らず、例えば、搬送距離計測手段としてのロータリーエンコーダの検出情報のみに基づいて、例えば、搬送コンベアが設定距離移動する毎に被計測物が計測箇所に至ったものと判別するようにする等各種の構成で実施してもよい。
【００７５】
（３）上記第１実施形態では、前記計測用設定時間を被計測物の品種の違いに応じて変更させるために、外観検査装置の検出結果を利用して品種を判別して自動的に品種の違いによる動作条件の設定を行うようにしたが、このような構成に代えて、例えば、受光部にて計測される計測分光スペクトルデータの計測結果に基づいて、品種を判別して自動的に品種の違いによる動作条件の設定を行うようにしてもよい。例えば、予め、計測対象となる複数の果菜類について計測分光スペクトルデータを計測してその特徴を調べておき、被計測物を計測する際にその特徴に基づいて品種を判別するようにしてもよい。
【００７６】
（４）上記第２実施形態では、受皿検出手段としての受皿検出センサを備えて、この受皿検出センサが受皿の搬送方向の先頭位置が設定位置に到達したことを検出すると、直ちに、前記計測用電荷蓄積処理を実行する構成としたが、このような構成に代えて、第１実施形態と同様に、受皿検出センサが受皿の搬送方向の先頭位置が手前側位置に到達したことを検出してからロータリーエンコーダの検出情報に基づいて被計測物が計測箇所に至ったことを判別する構成としてもよい。
【００７７】
（５）上記第２実施形態では、受皿が無端回動帯に載置されるフリーキャリア式に構成したが、無端回動帯に設定ピッチ毎に連結される構成としてもよい。
【００７８】
（６）上記第１実施形態では、投光部と受光部とが計測箇所の左右両側部に振り分けて配置される構成のものを例示したが、このような構成に代えて、投光部と受光部とが計測箇所の上下両側部に振り分けて配置される構成としてもよい。
【００７９】
（７）上記第２実施形態では、計測箇所の左右両側部に一対の投光部を振り分けて配置し、計測箇所の下側に出てくる光を光ファイバーで受光して受光部に導く構成のものを例示したが、このような構成に代えて、計測箇所の横一側箇所に１つの投光部を配置する構成としてもよく、光ファイバーで受光するものに代えて、計測箇所の下側に受光部を備えて受光部にて透過光を直接受光する構成としてもよい。又、投光部と受光部とを計測箇所の例えば横一側箇所に並べて配置して光投射方向に対してほぼそれを反対方向に出てくる光を受光するようにしてもよい。
【００８０】
（９）上記各実施形態では、投光部の光源としてハロゲンランプを用いたが、これに限らず、水銀灯、Ｎｅ放電管等の各種の光源を用いてもよく、受光部における受光センサは、ＣＣＤ型ラインセンサに限らずＭＯＳ型ラインセンサ等の他の検出手段を用いるようにしてもよい。
【００８１】
（１０）上記各実施形態では、被計測物Ｍの内部品質として、糖度や酸度を例示したが、これに限らず、食味の情報等、それ以外の内部品質を計測してもよい。
【図面の簡単な説明】
【図１】品質評価装置の正面図
【図２】品質評価装置の側面図
【図３】品質評価装置の正面図
【図４】品質評価装置の一部切欠正面図
【図５】品質評価装置の平面図
【図６】分光器の構成図
【図７】シャッター機構を示す図
【図８】投光部の切欠平面図
【図９】制御ブロック図
【図１０】設置状態を示す平面図
【図１１】外観検査装置を示す図
【図１２】計測作動のタイミングチャート
【図１３】第２実施形態の品質評価装置の正面図
【図１４】第２実施形態の受皿を示す図
【図１５】第２実施形態の被計測物の検出状態を示す図
【図１６】第２実施形態の計測作動のタイミングチャート
【符号の説明】
１ 投光部
２ 受光部
４、４Ａ 搬送手段
１７ 入射状態切換手段
１９ 搬送距離計測手段
２３ 受光センサ
５０ 被計測物検出手段
７３ 受皿検出手段
Ｈ 制御手段
Ｍ 被計測物[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is a light projecting unit that projects light on fruits and vegetables as an object located at a measurement location, and receives transmitted light or reflected light from the object by a charge accumulation type light receiving sensor. A light receiving unit that obtains light receiving information for quality evaluation, a conveying unit that conveys the object to be measured via the measurement location, and obtains internal quality information of the object to be measured based on the light receiving information of the light receiving unit. And a control means for controlling the operation of each part.
[0002]
[Prior art]
The quality evaluation device for fruits and vegetables described above is for measuring the quality of fruits and vegetables such as tangerines and apples as objects to be measured, for example, the internal quality such as sugar content and acidity in a non-destructive state. Conventionally, an evaluation device has the following configuration.
[0003]
In other words, when the object to be measured conveyed by the conveyance means reaches a position slightly closer to the conveyance direction than the measurement position, specifically, light projected from the light projection unit and traveling toward the light receiving unit is emitted. When the leading position in the transport direction of the measured object reaches the light passing point, the charge discharging operation for discharging the charge accumulated in the light receiving sensor is repeated twice, and the charge discharging operation is performed. When the object to be measured reaches the measurement location later, a charge accumulation process for measurement for accumulating charge in the light receiving sensor is performed until a charge accumulation time as a set time for measurement elapses, and the accumulated charge is calculated. The internal quality information of the object to be measured is obtained by taking out and using it as light reception information for quality evaluation. When the head position in the transport direction of the object to be measured has not reached the light passing point, the shutter mechanism is kept closed so that external light does not enter the light receiving sensor. Are configured to continuously perform the charge accumulation operation (for example, see Patent Document 1).
[0004]
[Patent Document 1]
JP-A-2002-107294 (pages 5 to 6, FIGS. 5 and 6)
[0005]
[Problems to be solved by the invention]
In the above-described conventional configuration, when the object to be measured conveyed by the conveyance unit reaches a position slightly upstream in the conveyance direction from the measurement position, the charge discharging operation is performed prior to the charge accumulation process for measurement. By doing so, residual charge is prevented from remaining on the light receiving sensor as much as possible. To add an explanation, the light receiving sensor is configured to receive the transmitted light or the reflected light from the object to be measured and accumulate the electric charge. The part may remain inside the light receiving sensor. If the transmitted light or the reflected light from the measurement object is newly received in the state where the residual charge exists, an error occurs in the reception light information, and an error occurs in the measurement object based on the reception information of the light receiving sensor. Since errors also occur in the quality information, such residual charges are minimized by performing a charge discharging operation prior to the charge storage process for measurement.
[0006]
However, in the above-described conventional configuration, when a plurality of objects to be measured conveyed by the conveyance unit continue to reach the measurement location at short time intervals, the measurement is performed such that the residual electric charge as described above does not remain as much as possible. Although the processing can be performed, for example, the timing at which the object to be measured is conveyed by the conveyance means is irregular, and the time interval until the object to be measured is conveyed to the measurement location becomes long. In some cases, while the head position in the transport direction of the object to be measured does not reach the light passing point, the light receiving sensor is configured to continuously perform the charge storing operation, so that the stored charge increases. There is a risk.
[0007]
In addition, as described above, while the head position in the transport direction of the object to be measured has not reached the light passing point, the shutter mechanism is closed to prevent external light from entering the light receiving sensor. However, even in such a non-light state, a dark current is generated in the light receiving sensor, and if such a dark current is accumulated for a long time, the accumulated charge becomes large, and there is a possibility that saturation occurs. is there.
[0008]
Moreover, in the above-described conventional configuration, it is necessary to execute the charge discharging operation in a short time from when the head position in the transport direction of the object to be measured reaches the light passing point to when the charge accumulation process for measurement is executed. However, as described above, when the saturation occurs, it is difficult to sufficiently release the charge, and a residual charge may remain. Then, in such a situation, if the internal quality information of the measured object is obtained based on the detection result of the light receiving sensor, an error may occur in the internal quality information.
[0009]
The present invention has been made in view of such a point, and its object is to reduce the residual charge in the light receiving sensor and obtain light receiving information for quality evaluation in an optimal state as much as possible to thereby improve the internal quality of the measured object. It is an object of the present invention to provide a fruit and vegetable quality evaluation device that can prevent an error from occurring in information.
[0010]
[Means for Solving the Problems]
The fruit and vegetable quality evaluation device according to claim 1, wherein a light projecting unit that projects light onto fruit and vegetables as an object located at a measurement location, and transmits light or reflected light from the object to be measured. A light receiving unit that receives light by a charge accumulation type light receiving sensor and obtains light receiving information for quality evaluation, a conveying unit that conveys the object to be measured through the measurement location, and a light receiving unit based on the light receiving information of the light receiving unit Control means for determining the internal quality information of the object to be measured and controlling the operation of each part. Even if the measurement object is present at the measurement location, when the acquisition of the light reception information for the quality evaluation has been completed, the charge is accumulated in the light reception sensor until the set time for the power storage has elapsed from the power storage start timing, and thereafter, , Set time for discharge elapses Until the object to be measured conveyed by the conveyance means reaches the measurement location, from which time the discharge set time has elapsed. The charge accumulated in the light-receiving sensor is released until the time elapses, and thereafter, the charge accumulation process for measurement is performed in which the light-receiving sensor accumulates the charge to be used as the light-receiving information for quality evaluation until the measurement set time elapses. Is performed.
[0011]
That is, the object to be measured is transported by the transporting means in a state of passing through the measurement point, and when the object is located at the measurement point, the received light information for the quality evaluation is obtained. Although the information is required, the control means has completed the acquisition of the light reception information for quality evaluation when the object to be measured does not exist at the measurement location and even when the object to be measured exists at the measurement location. In this case, the charge storage and discharge process is repeatedly performed in which the charge is accumulated in the light receiving sensor from the power storage start timing until the set time for power storage elapses, and thereafter, the charge accumulated in the light receiving sensor is released until the set time for discharge elapses. Will do. That is, when the measurement charge accumulation process is not executed, the charge accumulation and discharge process is always executed repeatedly. Therefore, the operation of releasing the accumulated electric charge is repeatedly performed at a predetermined time interval. The charge accumulated in the sensor can be sufficiently released, and the possibility that the charge remains in the light receiving sensor after the operation of releasing the charge is reduced.
[0012]
When the object to be measured conveyed by the conveyance means reaches the measurement location, the control means discharges the electric charge accumulated in the light receiving sensor until the set time for discharge has elapsed from that time. Until time elapses, measurement charge accumulation processing for accumulating charges to be used as light reception information for quality evaluation in the light receiving sensor is executed. The internal quality information of the object to be measured is obtained by using the charges accumulated by the measurement charge accumulation process as light reception information for quality evaluation.
[0013]
Further, when the charge accumulation and discharge processing is repeatedly performed as described above, there is little possibility that charges remain inside the light receiving sensor after the operation of discharging the charges is completed. After performing the operation of discharging electric charge, there is little possibility that the electric charge remains inside the light receiving sensor, and when receiving the transmitted light or reflected light from the measured object to obtain the received light information, the remaining light remains in the received light information. Errors due to charges are small.
[0014]
Therefore, the quality evaluation apparatus for fruit and vegetables can reduce errors in the internal quality information of the object to be measured by reducing the residual charge in the light receiving sensor and obtaining light receiving information for quality evaluation in the most appropriate state. Can be provided.
[0015]
According to a second aspect of the present invention, in the fruit quality evaluation apparatus according to the first aspect, the transmitted light or the reflected light from the measured object is received in an open state that allows the light receiving sensor to receive the light. Incident state switching means that can be switched to a shielded state for preventing the object, the control means switches from the shielded state to the open state when the object to be measured reaches the measurement location, and the open state The operation of the incident state switching means is controlled so as to return to the shielding state after maintaining the measurement set time until the elapsed time.
[0016]
That is, when the object to be measured conveyed by the conveyance unit reaches the measurement location, the incident state switching unit prevents the transmitted light or the reflected light from being received by the light receiving sensor, and the transmission state from the object to be measured changes from the blocking state. Since the light or the reflected light is switched to an open state that allows the light to be received by the light receiving sensor, the transmitted light or the reflected light from the object to be measured can be received by the light receiving sensor. The measurement charge accumulation process can be appropriately performed. Then, after switching to the open state, the open state is maintained until the set time for measurement elapses, and then the state is returned to the shielded state. Therefore, when the charge accumulation processing for measurement is not performed, the incident state The switching means is kept in the shielded state.
[0017]
Therefore, transmitted light or reflected light from the object to be measured is received by the light receiving sensor only during the execution of the measurement charge accumulation process, and the measurement charge accumulation process can be appropriately executed. Since the transmitted light or the reflected light from the object to be measured is not received by the light receiving sensor during the repeated execution of the accumulation and discharge processing, it is possible to prevent the generation of residual charges inside the light receiving sensor. be able to.
[0018]
According to a third aspect of the present invention, in the fruit and vegetable quality evaluating apparatus according to the first or second aspect, the transporting unit transports the object to be measured in a state of being placed on the tray while being positioned at a specific position on the tray. Wherein the control means includes a tray detecting means for detecting that the leading position of the tray in the transport direction has reached a set position, and the measured object is measured based on the detection information of the tray detecting means. The apparatus is configured to determine that an object has reached the measurement location.
[0019]
That is, the object to be measured is conveyed while being placed on the tray while being positioned at a specific position on the tray. When the object to be measured is conveyed while being placed on the pan in this way, the pan detection means detects that the leading position of the pan in the conveying direction has reached the set position. Based on the detection information of the means, it is determined that the measured object has reached the measurement location.
[0020]
For example, when the relative positional relationship between the set position and the measurement location is associated with the relative positional relationship between the head position of the pan and the specific position, the pan detecting means detects the head in the transport direction of the pan. With the detection that the position has reached the set position, it is possible to immediately determine that the object to be measured has reached the measurement location. There is a configuration in which it is determined that an object to be measured has reached the measurement location after a required time from the detection of reaching the set position to the transport to the measurement location has elapsed.
[0021]
Since the mounting position of the object to be measured on the pan is specified in this manner, the relative positional relationship between the head position of the pan and the object to be measured is substantially constant regardless of the size of the object to be measured. In other words, even when the object to be measured is small, the relative positional relationship between the head position of the pan and the object to be measured is the same, so that the pan detection unit detects that the head position in the transport direction of the pan has reached the set position. The position of the measured object at the time of detection always has the same relative positional relationship regardless of the size of the measured object. Therefore, it is possible to determine that the measured object has reached the measurement location based on the detection information of the pan detection means, and even if the measured object is small, Can be properly determined.
[0022]
According to a fourth aspect of the present invention, in the fruit quality evaluation apparatus according to the first or second aspect, the control unit may be configured such that a head position of the measurement object transported by the transport unit in the transport direction is more than the measurement location in the transport direction. An object detection means for detecting arrival at a near side position located on the upper side; and a conveyance distance measurement means for measuring a conveyance distance of the object to be measured by the conveyance means, wherein the measurement After detecting that the head position of the measured object has reached the near side position based on the detection information of the object detecting means, the measured object is positioned at the measurement point based on the detection information of the transport distance measuring means. Characterized in that it is configured to determine that the condition has been reached.
[0023]
That is, after detecting that the head position of the measured object has reached the near side position, the measured object has been conveyed from the near side position to the measurement location based on the detection information of the conveying distance measuring means. When detected, it is determined that the measured object has reached the measurement location. In addition, it is detected by the measured object detecting means that the leading position in the conveying direction of the measured object conveyed by the conveying means has reached the near side position located on the upper side in the conveying direction from the measurement point. And, when it is determined based on the detection information of the transport distance measuring means that the transport distance of the object to be measured from that point in time is a distance corresponding to the distance from the near position to the measurement location, That is, it is determined that the object to be measured has reached the measurement location based on the determination result. Therefore, it is possible to appropriately determine that the measurement object has been properly conveyed without being placed on the pan.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
[0025]
(1st Embodiment)
Hereinafter, a first embodiment of a fruit and vegetable quality evaluation apparatus according to the present invention will be described with reference to the drawings.
The fruit and vegetable quality evaluation device according to the present invention is a device for measuring the sugar content and the acidity as the quality of fruit and vegetables such as tangerine as an object to be measured, and the fruit and vegetable as the object to be measured located at the measurement point A light projecting unit for projecting light to the object, a light receiving unit for receiving transmitted light from the object to be measured by a charge accumulation type light receiving sensor to obtain light receiving information for quality evaluation, and a measuring unit for measuring the object to be measured. And control means for obtaining internal quality information of the object to be measured based on the light receiving information of the light receiving section and controlling the operation of each section.
[0026]
More specifically, as shown in FIG. 1, the quality evaluation device receives the light transmitted through the object M, and the light projecting unit 1 that irradiates the object M with light, and measures the received light. It is configured to include a light receiving unit 2 and a control unit 3 using a microcomputer for executing various control processes. The object to be measured M is placed and conveyed in a line in a line by a conveyor 4 as a conveying means. It is configured so as to sequentially pass through measurement points by the present apparatus. Then, in a state where the light projected from the light projecting unit 1 passes through the object M and is received by the light receiving unit 2 with respect to the object M located at the measurement location, the light projecting unit 1 and the light receiving unit 2 are arranged on the left and right sides of the measurement location, that is, on both sides in the transport width direction of the transport conveyor 4.
[0027]
Next, the configuration of the light emitting unit 1 will be described.
The light projecting unit 1 includes two light sources, and is configured to irradiate light from the two light sources to an object to be measured located at a measurement location with mutually different optical axes for irradiation. . Further, it is configured such that two optical axes for irradiation by each light source intersect at or near the surface portion of the object to be measured located at the measurement location.
That is, as shown in FIG. 4 and FIG. 8, a light source 5 composed of two halogen lamps separated in the transport direction by the transport conveyor 4 is provided, and a light source 5 corresponding to each of these two light sources 5 is provided. Is provided. In other words, a concave light reflector 6 is provided as a light collecting means for reflecting light emitted from the light source 5 to focus on the surface of the object M to be measured. Plate 7, which is positioned so as to correspond to the vicinity of the focal position of the light, and suppresses the spread of the condensed light to the radially outward side by passing through a large stop hole 7 a. 7, a light amount adjusting plate 8 that can be switched between a state in which light passes through, a state in which light passes through a small aperture 8a, and a state in which light is blocked. A collimator lens 9 that changes the light into parallel light, a reflector 10 that reflects and bends the light converted into parallel light, and a condenser lens 11 that collects the light reflected by the reflector 10 for one light source 5. It is provided as an optical system. Each of the light amount adjusting plates 8 is integrally rocked by a projection light amount adjusting motor 12, and is configured to be freely switchable to each of the above states.
[0028]
The light projecting unit 1 has a configuration in which the above-described members are housed in a casing 13 and assembled into a unit. Further, the light projecting unit 1 is provided in an oblique posture so as to irradiate light to an object to be measured located at a measurement location in an obliquely downward direction, and even if the object to be measured has a small external dimension. Light is prevented from directly entering the light receiving section 2.
[0029]
Next, the configuration of the light receiving section 2 will be described.
As shown in FIG. 4, the light receiving unit 2 includes a condensing lens 14 for condensing light transmitted through the object to be measured M, and a wavelength region 680 to 990 nanometers in the near infrared region of light converted into parallel light. A bandpass mirror 15 that reflects only light in the range of (nm) upward and allows light of other wavelengths to pass through as it is, and a condenser lens 16 that collects measurement target light reflected upward by the bandpass mirror 15. A shutter mechanism as an incident state switching means capable of switching between an open state in which light passing through the condenser lens 16 is passed as it is and received by the light receiving sensor and a blocked state in which light is prevented from being received; 17, when the light that has passed through the shutter mechanism 17 in the open state is incident, the spectroscope 18 and the like are configured to disperse the light and measure the spectral data. A filter switching mechanism E for switching a plurality of various filters for adjusting the amount of light acting on the light incident on the spectroscope is provided below the shutter mechanism 17, that is, at a position on the upper side in the light incident direction. I have.
[0030]
As shown in FIG. 6, the spectroscope 18 reflects the measurement target light incident from the light entrance 20 which is the light receiving position, and separates the reflected measurement target light into light of a plurality of wavelengths. A concave diffraction grating 22 serving as a spectral unit and a light receiving sensor 23 for measuring spectral data by detecting the amount of light at each wavelength in the light to be measured spectrally separated by the concave diffraction grating 22 shield light from outside. It is arranged in a dark box 24 made of a light-shielding material. The light receiving sensor 23 is a charge storage type CCD having 1024 unit light receiving units that simultaneously receives light spectrally reflected by the concave diffraction grating 22 for each wavelength and converts and outputs a signal for each wavelength. It is composed of a line sensor. Although not described in detail, the line sensor includes a photoelectric conversion unit that converts a light amount into an electric signal (electric charge) for each unit light receiving unit, a charge accumulation unit that accumulates electric charge obtained by the photoelectric conversion unit, and Are formed on a semiconductor substrate provided with a drive circuit and the like for outputting the accumulated charges to the outside.
[0031]
As shown in FIGS. 6 and 7, the shutter mechanism 17 includes a disk 17A having a plurality of radially formed slits 25 in a state where the disk 17A is rotated around a vertical axis by a pulse motor 17B. The slits 25 are formed in the light entrance 20 of the dark box 24 such that the slits 25 are in an open state in which light passes when the slits 25 are vertically overlapped, and in a blocking state in which the light is blocked when the position of the slits 25 is shifted. A transmission hole 27 having substantially the same shape as that of FIG. 1 is formed, and the disk 17A is arranged so as to slide in close contact with the light entrance 20 of the dark box so as not to leak light. That is, the shutter mechanism 17 is provided in a state of being close to the light entrance 20 for the concave diffraction grating 22. Similarly to the light projecting section 1, the light receiving section 2 has a configuration in which the above-described members are housed in the casing 28 and assembled into a unit.
[0032]
Each of the light projecting unit 1 and the light receiving unit 2 is configured as a unit that can be detachably attached to each of the light projecting location and the light receiving location, respectively. The device frame F to which the light-receiving unit 2 is detachably attached to the light-transmitting unit 1 and the light-receiving unit 2 such that the positions corresponding to the left and right sides of the conveyor 4 at the measurement position are the light-transmitting and light-receiving positions. It is provided with a pair of mounting portions.
Further, the device frame F is provided with an up / down position adjusting mechanism 29 as up / down position adjusting means capable of vertically adjusting the position of the light projecting unit 1 and the light receiving unit 2 integrally, and the light projecting unit 1 and the light receiving unit. Each of the parts 2 is separately moved toward and away from the object to be measured located at the measurement point with respect to the apparatus frame F, that is, in a horizontal direction and a direction orthogonal to the transport direction of the transport conveyor 4. A horizontal position adjusting mechanism 30 as adjustable horizontal position adjusting means is provided.
[0033]
Next, the vertical position adjusting mechanism 29 will be described. As shown in FIGS. 1 to 5, a device frame F assembled in a rectangular frame shape so as to surround an outer peripheral portion of the quality evaluation device is provided. The four fixed support rods 31 are provided in a suspended state, and the lower ends of these four fixed support rods 31 are provided with support stands 32 for placing and supporting a measurement object A for calibration of a quality evaluation device described later. Is attached. An elevating table 34 is slidably supported in the up and down direction by four sliding support portions 33 with respect to the four fixed support bars 31. Further, a feed screw 35 supported in a hanging state from an upper side portion of the apparatus frame F is rotatably provided by an electric motor 36, and a female screw member 37 provided on an elevating table 34 is attached to the feed screw 35. The lifting table 34 can be vertically moved to an arbitrary position by rotating the feed screw 35 with an electric motor 36. Note that the feed screw 35 is also configured to be rotatable with a manual operation handle 38.
The object to be measured A for calibration of the quality evaluation device is placed on the elevation table 34 so that the object to be measured A for calibration of the quality evaluation device can be moved up and down even when the object to be measured A for calibration of the quality evaluation device is mounted and supported on the support 32. An insertion hole 34a is formed so as to allow the passage.
[0034]
Next, the horizontal position adjustment mechanism 30 will be described.
As shown in FIG. 3, the lifting table 34 is provided with two guide rods 39 extending along the direction in which the light projecting unit 1 and the light receiving unit 2 are arranged. The support members 40 and 41 as the pair of attachment portions to which the portion 1 and the light receiving portion 2 are detachably attached are supported by the guide bars 39 so as to be slidable. The guide bars 39 are connected at both ends in the longitudinal direction by connecting members 39a. In addition, two feed screws 42 and 43 extending along the direction in which the light projecting unit 1 and the light receiving unit 2 are arranged are provided on the elevating table 34 so as to be rotatable by electric motors 44 and 45, respectively. Female screw portions 46 and 47 provided on the support members 40 and 41 are screwed into the respective feed screws 42 and 43, and the respective feed screws 42 and 43 are respectively rotated forward and reverse by the electric motors 44 and 45. By doing so, each of the support members 40 and 41 can be separately adjusted in position in a horizontal direction orthogonal to the transport direction of the transport conveyor 4. Therefore, the light projecting unit 1 and the light receiving unit 2 respectively attached to the support members 40 and 41 are respectively rotated by the electric motors 44 and 45 by rotating the feed screws 42 and 43 forward and backward respectively. That is, it is possible to change and adjust the relative position in the direction of approaching and separating from the measurement location.
[0035]
Therefore, when the feed screw 35 is rotated by the electric motor 36, the elevating table 34 is vertically moved and adjusted, and accordingly, the light emitting unit 1 and the light receiving unit 2 supported by the elevating table 34 are integrated. Up and down movement can be adjusted, and by turning each of the electric motors 44 and 45, the light emitting unit 1 and the light receiving unit 2 are individually adjusted in position in a horizontal direction orthogonal to the transport direction of the transport conveyor 4. be able to.
[0036]
In addition to the description of the configuration of attaching the light projecting unit 1 and the light receiving unit 2 to the support members 40 and 41, the mounting pedestal portions 40a and 41a at the lower ends of the support members 40 and 41 have horizontal directions. Are formed with a plurality of positioning projections 40b and 41b projecting laterally at appropriate intervals, and correspond to the projections 40b and 41b, respectively, of the light projecting unit 1 and the light receiving unit 2 provided in a unit shape. When positioning holes are provided and the light projecting unit 1 and the light receiving unit 2 are mounted on the support members 40 and 41, the positioning projections 40b and 41b are fitted into the positioning holes as shown in FIGS. The light projecting unit 1 and the light receiving unit 2 are mounted by bolting an appropriate part near the position in a state where they are positioned. Therefore, in this device, when the light projecting unit 1 and the light receiving unit 2 are respectively attached, the light projecting position where the light projecting unit 1 is located, the measurement position, and the light receiving position where the light receiving unit 2 is located Are in a state where the light projecting unit 1 and the light receiving unit 2 are arranged in a form where each of them is located in a straight line. However, the mounting pedestal portions 40a, 41a at the lower end portions of the support members 40, 41 have slightly different lengths on the left and right so as to correspond to the vertical lengths of the light projecting unit 1 and the light receiving unit 2. Like that. The mounting portion of the light projecting unit 1 is provided with a tilting posture restricting tool 40c so that the projection direction is slightly obliquely downward.
[0037]
A reference filter 49 is provided above the measurement location of the object M on the conveyor 4 and supported by a support arm 48 extending downward from the support table 32. The reference filter 49 is configured by an optical filter having a predetermined absorbance characteristic, and specifically includes a pair of opal glasses.
[0038]
By vertically moving and adjusting the light projecting unit 1 and the light receiving unit 2 by the vertical position adjusting mechanism 29, the light from the light projecting unit 1 is measured on the transport conveyor 4 as shown in FIG. The normal measurement state in which the light is received by the light receiving unit 2 after passing through the object M, and the light from each light projecting unit 1 is transmitted through the reference filter 49 as shown by the phantom line in FIG. , And a calibration measurement state as indicated by a solid line in FIG. 3.
Although not described in detail, the outer peripheral portion of the quality evaluation device is surrounded by a wall provided on the device frame F except for a passing portion accompanying the transport of the measured object so that light does not enter from the outside. It has become.
[0039]
The quality evaluation device is configured such that a pseudo measurement object A having substantially the same characteristics as the light transmission characteristics of the object to be measured can be detachably mounted on the support table 32. The measurement object A is placed on the support 32 in a state where it is positioned as it is, and is configured to be easily detachable. When calibration is not performed, the measurement object A is detached from the support 32. Can be kept.
[0040]
The measuring object A for calibration of the quality evaluation device will be briefly described. As shown in FIG. 4, the outer peripheral portion is covered by a substantially square pillar-shaped outer casing 52 made of a non-translucent member. A storage part 51 for storing pure water J as a quality evaluation target in a sealed state is provided at a position located on the lower side inside the casing 52, and an air layer is formed between the storage part 51 and the outer casing 52. I have. The Peltier device 55 is operated so that the temperature of the air layer is maintained at a set temperature (for example, 30 ° C.) which is a temperature of the object to be measured when the quality is evaluated by the quality evaluation device or a temperature close thereto. It is a configuration to make it. A light-passing portion 61 and a light-passing portion 62 are formed at positions corresponding to the left and right sides of the storage portion 51 in the outer casing 52, respectively, so that light can enter the outer casing 52 made of a non-translucent member. A passage hole is formed at a position corresponding to the side light passage portion 61 and the light exit side light passage portion 62, and an opal glass G as a diffuser is mounted in a state of being kept in an airtight state.
[0041]
As shown in FIG. 10, the conveyor 4 has a configuration in which an endless rotating band 4a is driven by an electric motor 4b, and the rotation of a rotating shaft of a rotating body 4c that winds the endless rotating band 4a. In this state, a rotary encoder 19 is provided as a transport distance measuring means for detecting a transport distance by the transport conveyor, and detection information of the rotary encoder 19 is also inputted to the control unit 3. Whether the leading position in the transport direction of the object to be measured transported by the transport conveyor 4 has reached the near side position located on the upstream side in the transport direction from the measurement location at the location on the upstream side in the transport direction of the measurement point according to An optical passage detection sensor 50 is provided as an object to be measured detecting means for detecting the detection. In the passage detection sensor 50, a light emitting device 50a that emits light and a light receiving device 50b that receives the light are arranged on both right and left sides of a transport path by the transport conveyor 4, and light emitted from the light emitting device 50a is detected. When the light is blocked by the object and cannot be received by the light receiving device 50b, it can be determined that the object to be detected exists.
[0042]
The control unit 3 is configured using a microcomputer. As shown in FIG. 9, the control unit 3 obtains the internal quality of the object to be measured based on the detection information of the passage detection sensor 50 and the light receiving sensor 23. The operation is controlled. The control unit 3 executes an arithmetic process for analyzing the internal quality of the measurement object M using a spectroscopic analysis technique, which is a known technique as described later, and also includes a light receiving sensor 23, a shutter mechanism 17, 12, the operation of each part such as the management of the operation of the vertical position adjusting motor 36 and the horizontal position adjusting motors 44 and 45 is controlled.
[0043]
Next, a control operation by the control unit 3 will be described.
The control unit 3 irradiates the reference filter 49 with the light from the light projecting unit 1 instead of the object to be measured M, and separates the transmitted light from the reference filter 49 by the light receiving unit 2 to separate the light. Reference data measurement processing for obtaining spectral spectrum data obtained by receiving light as reference spectral spectrum data, and irradiating the object M conveyed by the conveyor 4 with light from the light projecting unit 1 for measurement and spectroscopy. The spectrum data is obtained, and each of the normal data measurement processes for analyzing the internal quality of the measured object M is executed based on the measured spectrum data and the reference spectrum data.
[0044]
The reference data measurement processing will be described.
While the transport of the object M by the transport conveyor 4 is stopped, the vertical position adjustment mechanism 29 switches to the reference measurement state, the shutter mechanism 17 switches to the open state, and receives light from the light projecting unit 1. The reference filter 49 is irradiated in place of the measurement object M, the transmitted light from the reference filter 49 is separated by the light receiving unit 2, and the spectral light data obtained by receiving the separated light is used as the reference spectral data. Measure as spectral data. Further, the detection value (dark current data) of the light receiving sensor 18 in a non-light state in which light to the light receiving unit 2 is blocked is also measured. That is, the shutter mechanism 17 of the light receiving unit 2 is switched to the shielded state, and the detection value of each unit pixel of the light receiving sensor 18 at that time is obtained as dark current data.
[0045]
Next, the normal data measurement processing will be described.
In the normal data measurement process, the vertical position adjusting mechanism 29, specifically, the vertical position adjusting electric motor 36 is operated to switch the elevator 34 to the normal measurement state, and the transport of the workpiece M by the transport conveyor 4 is performed. I do. Then, when the object to be measured does not exist at the measurement location and when acquisition of light reception information for quality evaluation as described later is completed even when the object to measure Charge storage and discharge processing for accumulating charge in the light receiving sensor 23 until the set time for use has elapsed, and then discharging the charge stored in the light receiving sensor 23 until the set time for discharge has elapsed. When the object to be measured conveyed at step 4 reaches the measurement location, the electric charge accumulated in the light receiving sensor 23 is released until the set time for discharge has elapsed from that time, and then the light is received until the set time for measurement elapses. The sensor 23 is configured to execute a measurement charge accumulation process for accumulating charges to be used as light reception information for quality evaluation.
[0046]
That is, as shown in FIG. 12, the control unit 3 acquires light reception information for quality evaluation as described below when the object to be measured does not exist at the measurement location and even when the object to measure is present at the measurement location. When the charging is completed, the charge is always accumulated in the light receiving sensor 23 until a set time for power storage (about 40 msec) elapses from the start timing of power storage, and thereafter, the light receiving sensor 23 until the set time for discharge (about 10 msec) elapses The operation of the light receiving sensor 23 is controlled so that the charge storage and discharge process for discharging the charge stored in the storage 23 is repeatedly performed at every set period T1 (about 50 msec).
[0047]
The control unit 3 detects that the head position of the measured object has reached the near side position based on the detection information of the passage detection sensor 50, and then detects the measured object based on the detection information of the rotary encoder 19. Is configured to determine that the measurement point has been reached. In addition, when the passage detection sensor 50 detects that the leading position of the measured object M in the transport direction has come to a position on the near side that is the detection position of the passage detection sensor 50, the detection information of the rotary encoder 19 Based on this, it is determined whether or not the transport distance of the object to be measured from that point has reached the transport distance from the near side location to the measurement location. Then, when the transport distance is reached, it is determined that the measured object M has reached the measurement location.
[0048]
When it is determined that the object to be measured M has reached the measurement location in this way, as shown in FIG. 12, instead of repeatedly executing the charge accumulation and discharge process, light reception is performed until the set time for discharge has elapsed from that time. The charge accumulated in the sensor 23 is released, and thereafter, a charge accumulation process for measurement is performed to cause the light receiving sensor 23 to accumulate charges for use as light reception information for quality evaluation until the set time for measurement elapses. . The control unit 3 switches the shutter mechanism 17 from the closed state to the open state when the object reaches the measurement location in parallel with the operation switching of the light receiving sensor 23, and changes the open state to the electric charge. The operation of the shutter mechanism 17 is controlled so as to return to the blocking state after maintaining the shutter opening time T2 for performing the accumulation until the shutter opening time T2 elapses. As described above, while the shutter mechanism 17 is open, the light emitted from the light projecting unit 1 and transmitted through the object to be measured by the light receiving unit 2 until the measurement set time elapses is converted into light by the light receiving sensor 23. And accumulates charges. That is, the shutter mechanism 17 is a time obtained by adding the set time for discharge and the set time for measurement. In the example shown in FIG. 12, the set time for discharge is the light emission after the object reaches the measurement location. The time required for the measured object to move to a position where the wraparound light from the unit 1 does not directly enter the light receiving unit 2 is set to, for example, about 10 msec. Also, the measurement set time is about 40 msec, and the shutter open time T2 is about 50 msec. Then, after the shutter open time T2 has elapsed, the accumulated electric charge is taken out to obtain measured spectral data as light reception information for quality evaluation.
[0049]
Note that the measurement set time is changed in accordance with the type of the object to be measured or the like. To add an explanation, for example, an apple or the like has a long time (about 40 msec as described above) since light is difficult to transmit. If the light is relatively easy to transmit, such as Unshu mandarin orange, a relatively short time (about 10 msec) is set. The transfer speed of the transfer conveyor 4 is appropriately set in consideration of the size of the object to be measured, the measurement time as described above, and the like. That is, in the case of apple, the set time for power storage (about 40 msec) is almost the same as the set time for power storage in the charge storage and discharge processing, and the maximum time that can be stored is set. A short time is set.
[0050]
The setting of the operating condition according to the difference of the kind is performed not automatically but manually. That is, in this embodiment, as shown in FIG. 10, apart from this quality evaluation device, a visual inspection device GK that inspects the external appearance of the object to be transported is provided at a location on the upper side in the transport direction of the transport conveyor 4. The type is determined by using the detection result of the visual inspection device GK, and the operating condition is automatically set according to the type difference. As shown in FIG. 11, the visual inspection apparatus GK includes a color video camera VC for capturing an image of an object to be measured inside a shielding cover 80. Using a well-known image processing method, it is configured to determine the presence or absence of external abnormalities such as external dimensions and color unevenness, etc., and use this information together with the evaluation results of the quality evaluation device to rank fruits and vegetables It is configured to be. An illumination device 81 for indirectly illuminating the measured object and a reflecting mirror 82 for photographing the side surface of the measured object are also provided. The control unit 3 receives the measurement result from the visual inspection device GK, determines the type, and changes and adjusts the measurement set time based on the determination result.
[0051]
Then, based on the thus obtained reference spectral data, dark current data and measured spectral data, a calculation process for analyzing the internal quality of the measurement object M is performed by using a known spectral analysis method. It is configured as follows.
In other words, the reference spectral spectrum data obtained in the reference data measurement mode, obtained as described above, and the normalized using the dark current data are used to obtain the absorbance spectrum data for each wavelength that has been separated. At the same time, a second derivative of the absorbance spectrum data is obtained. Specifically, absorbance spectrum data corresponding to the received light information obtained for each unit light receiving unit of the light receiving sensor 23 is obtained. The second derivative of the specific wavelength for calculating the component among the second derivative of the absorbance spectrum data obtained in this way corresponds to the sugar content contained in the measurement object M by the preset calibration formula and the second derivative. It is configured to execute a quality evaluation process of calculating a component amount as a quality evaluation value corresponding to the component amount or acidity to be performed.
[0052]
Therefore, in this embodiment, the control unit 3, the passage detection sensor 50, and the rotary encoder 19 determine the internal quality information of the object to be measured based on the light receiving information of the light receiving unit 2 and control the operation of each unit. H will be constructed.
[0053]
When the absorbance spectrum data d is Rd for the reference spectral data, Sd for the measured spectral data, and Da for the dark current data,
[0054]
(Equation 1)
d = log [(Rd-Da) / (Sd-Da)]
[0055]
It is calculated by the following arithmetic expression. Then, the absorbance spectrum data d obtained in this manner is included in the measurement object M using the value of the specific wavelength among the values obtained by secondarily differentiating the value and the calibration formula as shown in the following Expression 2. The calibration value for calculating the component amount corresponding to the sugar content or acidity is determined.
[0056]
(Equation 2)
Y = K0 + K1 · A (λ1) + K2 · A (λ2)
[0057]
However,
Y: Calibration value corresponding to component amount
K0, K1, K2; coefficient
A (λ1), A (λ2); second derivative of absorbance spectrum at specific wavelength λ
[0058]
Note that a specific calibration equation, specific coefficients K0, K1, K2, wavelengths λ1, λ2, and the like are preset and stored for each component for which the component amount is calculated. The calibration value (component amount) of each component is calculated using a specific calibration formula.
[0059]
Next, a procedure for creating a calibration equation will be described.
The calibration equation is individually set for each device based on data obtained by actually measuring a sample similar to the measurement target object before the measurement processing on the measurement target object. In other words, when a plurality of varieties of fruits and vegetables as described above are to be measured, a calibration formula is created for each of different varieties, and the respective formulas are stored.
[0060]
First, several tens to several hundreds of DUTs are prepared as the samples, spectral data for each wavelength is obtained for each sample using the spectral analyzer, and the above-described spectral data is used to obtain the spectral data. Such absorbance spectrum data is obtained. The absorbance spectrum data obtained in this manner is data obtained for each of the 1024 unit light receiving units of the light receiving sensor 23. Then, for each of the samples, a real component amount detection process for accurately detecting a chemical component of the measured object by a special inspection device based on, for example, destructive analysis or the like is performed to obtain a real component amount of the measured object. . Then, using the absorbance spectrum data of each sample obtained as described above, while comparing with the detection result of the actual component amount, using a method of multiple regression analysis, for the absorbance spectrum data and specific components The above-mentioned calibration equation showing the relationship with the component amount is obtained.
When a plurality of calibration formulas are stored according to a plurality of types as described above, which calibration formula is used by the control unit 3 in the measurement process is determined by the measurement result from the visual inspection device as described above. As in the case of the change adjustment of the measurement set time T4 based on the above, the adjustment is automatically performed in accordance with the change adjustment.
[0061]
[Second embodiment]
Next, a second embodiment according to the present invention will be described.
The quality evaluation apparatus of this embodiment is different from the first embodiment in that the arrangement configuration of the light projecting unit 1 and the light receiving unit 2, the configuration of the light passing path to the light receiving unit 2, the configuration of the conveyor, and the measuring method of the light receiving sensor 23 are different. Since the configuration is the same as that of the quality evaluation device of the embodiment, only different configurations will be described, and description of the same configurations will be omitted. Further, the light projecting unit 1 and the light receiving unit 2 are each configured to be assembled in a unit shape, and have substantially the same configuration as that used in the first embodiment.
[0062]
As shown in FIG. 13, two unit-shaped light projecting units 1 having the same configuration as the light projecting unit 1 in the first embodiment are provided, and these two light projecting units 1 are on the left and right sides of the measurement location, that is, The light projecting units 1 are arranged so that the light irradiation direction is substantially horizontal. That is, two unit-shaped light projecting units 1 are respectively attached to the support members 40 and 41 similar to the support members 40 and 41, respectively. However, the mounting base portions 40a, 41a at the lower ends of the support members 40, 41 are the same on the left and right so as to correspond to the vertical length of the light projecting portion 1. Further, the inclination restricting tool 40c used in the above-described quality evaluation device is not used so that the light irradiation direction of each light projecting unit 1 is substantially horizontal.
[0063]
The transport conveyor 4A is configured to be transported in a state where an object to be measured is placed on a tray 71 having an insertion hole 70 formed in the center thereof. A light receiving side end of an optical fiber 72 that receives light emitted from the light projecting unit 1 and transmitted through the object to be measured and transmitted downward through the insertion hole 70 of the tray 71 is arranged. The other end of the optical fiber 72 is connected to a unit-shaped light receiving section 2 having substantially the same configuration as the light receiving section 2, and receives light. The process of analyzing the internal quality in the control unit 3 based on the light receiving information by the light receiving unit 2 is the same as in the first embodiment.
[0064]
In this quality evaluation device, light is projected from each of the light projecting units 1 located on both left and right sides of the measured object located at the measurement location so as to substantially horizontally oppose each other, and inside the measured object. The light scattered and transmitted downward is received by the optical fiber 72 and guided to the light receiving unit 2.
[0065]
The transport conveyor 4 </ b> A is configured to transport the object to be measured M placed on the tray 71 in a state of being positioned at a specific position on the tray 71. That is, the receiving tray 71 is made of a soft material such as rubber, and as shown in FIG. 14, the outer shape is a cylindrical shape in a plan view, and a circular insertion hole 70 is formed in the center, and the upper surface on the outer peripheral side of the insertion hole 70 is formed. The side portion is configured so as to have an oblique shape positioned lower toward the center, and substantially spherical fruits such as peaches, pears, and apples to be measured are placed on the saucer 71. Then, it is placed under its own weight with its axis centered on the same axis as the insertion hole 70 at the center in plan view. That is, the center position on the receiving tray 71 corresponds to the specific position.
The tray 71 is a free carrier type tray placed on the endless rotating band 4d of the conveyor 4A, and is pressed by a pusher 4e provided at a predetermined interval in the conveying direction on the endless rotating band 4d. In this case, both ends in the width direction of the conveyance are guided by the regulating tools 4f arranged in the conveyance direction. The lower part of the receiving tray 71 at the center in the width direction of the endless rotating band 4d can receive the light emitted from the light projecting unit 1 and transmitted through the object M at the light receiving side end of the optical fiber 72. Open.
[0066]
In this embodiment, as shown in FIG. 15, an optical tray detection sensor 73 is provided as tray detection means for detecting that the leading position of the tray 71 in the transport direction has reached the set position. As with the passage detection sensor 50 of the first embodiment, the tray detection sensor 73 includes a light emitter 73a that emits light and a light receiver 73b that receives the light on both left and right sides of the transport path by the transport conveyor 4A. When the light emitted from the light emitter 73a is distributed and arranged and is blocked by the tray 71 as an object to be detected and cannot be received by the light receiver 73b, it is detected that the leading position of the tray 71 in the transport direction has reached the set position. It has a configuration.
[0067]
The control unit 3 is configured to determine that the measurement target M has reached the measurement location based on the detection information of the tray detection sensor 73. That is, when the tray detection sensor 73 detects that the leading position of the tray 71 in the transport direction has reached the set position, it is determined that the object to be measured M has reached the measurement location, and immediately, in the first embodiment, It is configured to execute the same measurement charge accumulation process as the measurement charge accumulation process.
[0068]
In addition, when the tray detection sensor 73 detects that the leading position of the tray in the transport direction has reached the set position, the light receiving side end of the optical fiber 72 is positioned in the transport direction of the insertion hole 70 in the transport direction in plan view. The positional relationship between the tray detection sensor 73 and the light receiving side end of the optical fiber 72 is set in advance so as to be located at the side position. Incidentally, each of the light projecting units 1 is arranged so as to be substantially linearly arranged in the conveying width direction with respect to the light receiving side end of the optical fiber 72.
As soon as the tray detection sensor 73 detects that the leading position of the tray in the transport direction has reached the set position, the electric charge for processing is immediately executed, and the transmitted light from the object is received by the optical fiber 72. The light can be appropriately received at the side end.
[0069]
Then, as shown in the time chart of FIG. 16, when the tray detection sensor 73 detects that the leading position of the tray 71 in the transport direction has reached the set position, the control unit 3 immediately executes the measurement. In addition to executing the charge accumulation process, the shutter mechanism 17 switches the shutter mechanism 17 from the closed state to the open state, and maintains the open state until the shutter open time T4 elapses, and then returns to the closed state. The operation of the mechanism 17 is controlled.
In this configuration, as soon as the tray detection sensor 73 detects that the leading position of the tray 71 in the transport direction has reached the set position, the measurement charge accumulation process is executed immediately. There is an advantage that the measurement error caused by the slip or fluctuation of the conveyor can be reduced and the arrival of the object to be measured can be accurately detected without being affected by the fluctuation of the conveyance speed of 4A.
[0070]
In this embodiment, the control section H is configured by the control section 3 and the pan detection sensor 73 to obtain internal quality information of the object to be measured based on the received light information of the light receiving section 2 and to control the operation of each section. Will be.
[0071]
In this embodiment, similarly to the first embodiment, the control unit 3 determines whether the object to be measured does not exist at the measurement location and the object to be measured exists at the measurement location, as shown in FIG. Also, when the acquisition of the light reception information for quality evaluation as described above has been completed, the charge is always accumulated in the light receiving sensor 23 until the set time for power storage elapses from the power storage start timing. The operation of the light receiving sensor 23 is controlled so as to repeatedly execute the charge storage and discharge processing for releasing the charge stored in the light receiving sensor until the time elapses at every set period T3.
[0072]
[Another embodiment]
Hereinafter, other embodiments will be listed.
[0073]
(1) In the first embodiment, the transport distance measuring unit detects that the leading position of the measured object has reached the near side position based on the detection information of the passage detection sensor as the measured object detecting unit. Although it is configured to determine that the measured object has reached the measurement location based on the detection information of the rotary encoder as described above, the following configuration may be used instead of such a configuration.
That is, a configuration may be employed in which the passage detection sensor directly detects whether or not the measured object has reached the measurement location. In other words, the detection position at which the passage detection sensor detects the position on the upper side in the transport direction of the object to be measured is located slightly upstream of the light receiving position of the light receiving sensor in the transport direction, and the transport of the object to be measured is performed by the passage detection sensor. The configuration is such that the charge accumulation process for measurement is executed immediately upon detection of a position on the upper side in the direction.
[0074]
(2) In the first embodiment, the measurement object is directly detected by providing the passage detection sensor as the measurement object detection means, and based on the detection result, the measurement object reaches the measurement location. The determination is not limited to such a configuration. For example, based on only the detection information of the rotary encoder serving as the transport distance measuring means, for example, every time the transport conveyor moves a set distance, the measurement target is moved to the measurement position. The present invention may be implemented in various configurations, such as determining that the condition has been reached.
[0075]
(3) In the first embodiment, in order to change the setting time for measurement in accordance with the type of the object to be measured, the type is determined by using the detection result of the visual inspection device, and the type is automatically determined. The operating conditions are set according to the difference between the two types. However, instead of such a configuration, for example, based on the measurement result of the measured spectral data measured by the light receiving unit, the type is determined and automatically determined. Operation conditions may be set according to the type of product. For example, measurement spectral data may be measured in advance for a plurality of fruits and vegetables to be measured to check their characteristics, and when measuring an object to be measured, a variety may be determined based on the characteristics. .
[0076]
(4) In the second embodiment, the pan detection sensor is provided as a pan detection means, and when the pan detection sensor detects that the leading position of the pan in the transport direction has reached the set position, the pan detection sensor immediately detects the measurement. Although the configuration is such that the charge accumulation process is performed, instead of such a configuration, similarly to the first embodiment, the tray detection sensor detects that the leading position of the tray in the transport direction has reached the near side position. May be configured to determine that the object to be measured has reached the measurement location based on the detection information of the rotary encoder.
[0077]
(5) In the second embodiment, the receiving tray is configured as a free carrier type placed on the endless rotating band, but may be connected to the endless rotating band at every set pitch.
[0078]
(6) In the above-described first embodiment, a configuration in which the light projecting unit and the light receiving unit are arranged separately on the left and right sides of the measurement location is exemplified. A configuration in which the light receiving unit and the light receiving unit are separately arranged on both upper and lower sides of the measurement location may be adopted.
[0079]
(7) In the above-described second embodiment, a pair of light projecting units are separately arranged on both right and left sides of the measurement location, and light coming out below the measurement location is received by an optical fiber and guided to the light receiving unit. However, instead of such a configuration, a configuration may be adopted in which one light projecting unit is arranged at one lateral side of the measurement location. A configuration may be adopted in which a light receiving unit is provided and the transmitted light is directly received by the light receiving unit. Further, the light projecting unit and the light receiving unit may be arranged side by side, for example, at one side of the measurement location, and may receive light that exits almost in the opposite direction to the light projection direction.
[0080]
(9) In each of the above embodiments, a halogen lamp was used as the light source of the light projecting unit. However, the present invention is not limited to this, and various light sources such as a mercury lamp and a Ne discharge tube may be used. Not only the CCD type line sensor but also other detecting means such as a MOS type line sensor may be used.
[0081]
(10) In each of the above embodiments, the sugar content and the acidity are exemplified as the internal quality of the measured object M. However, the present invention is not limited to this, and other internal quality such as taste information may be measured.
[Brief description of the drawings]
FIG. 1 is a front view of a quality evaluation device.
FIG. 2 is a side view of the quality evaluation device.
FIG. 3 is a front view of the quality evaluation device.
FIG. 4 is a partially cutaway front view of the quality evaluation device.
FIG. 5 is a plan view of a quality evaluation device.
FIG. 6 is a configuration diagram of a spectroscope.
FIG. 7 shows a shutter mechanism.
FIG. 8 is a cutaway plan view of the light emitting unit.
FIG. 9 is a control block diagram.
FIG. 10 is a plan view showing an installation state.
FIG. 11 is a diagram showing a visual inspection device.
FIG. 12 is a timing chart of a measurement operation.
FIG. 13 is a front view of a quality evaluation device according to a second embodiment.
FIG. 14 is a view showing a saucer according to the second embodiment;
FIG. 15 is a diagram illustrating a detection state of an object to be measured according to the second embodiment.
FIG. 16 is a timing chart of a measurement operation according to the second embodiment.
[Explanation of symbols]
1 Emitter
2 Receiver
4, 4A transport means
17 Incident state switching means
19 Transport distance measuring means
23 Light receiving sensor
50 Measured object detection means
73 saucer detection means
H control means
M object to be measured

Claims (4)

計測箇所に位置する被計測物としての果菜類に対して光を投射する投光部と、前記被計測物からの透過光又は反射光を電荷蓄積型の受光センサにて受光して品質評価用の受光情報を得る受光部と、前記被計測物を前記計測箇所を経由して搬送する搬送手段と、前記受光部の前記受光情報に基づいて被計測物の内部品質情報を求めるとともに各部の動作を制御する制御手段とを備えて構成されている果菜類の品質評価装置であって、
前記制御手段が、
被計測物が前記計測箇所に存在しないとき及び被計測物が前記計測箇所に存在しても前記品質評価用の受光情報の取得が終了しているときは、蓄電開始タイミングから蓄電用設定時間が経過するまで前記受光センサに電荷を蓄積させ、その後、放電用設定時間が経過するまで前記受光センサに蓄積された電荷を放出させる電荷蓄積放電処理を繰り返し実行し、
且つ、前記搬送手段にて搬送される前記被計測物が前記計測箇所に至ると、そのときから放電用設定時間が経過するまで前記受光センサに蓄積された電荷を放出させ、その後、計測用設定時間が経過するまで前記受光センサに前記品質評価用の受光情報として用いるための電荷を蓄積させる計測用電荷蓄積処理を実行するように構成されている果菜類の品質評価装置。A light projecting unit that projects light on fruits and vegetables as an object to be measured located at a measurement location, and a transmitted light or a reflected light from the object to be measured is received by a charge accumulation type light receiving sensor for quality evaluation. A light receiving unit that obtains light receiving information of the object, a conveying unit that conveys the object to be measured via the measurement location, and an operation of each unit while obtaining internal quality information of the object to be measured based on the light receiving information of the light receiving unit. And a control means for controlling the quality evaluation device for fruits and vegetables,
The control means,
When the object to be measured does not exist at the measurement location and when the acquisition of the light reception information for the quality evaluation has been completed even when the object to measure is present at the measurement location, the power storage set time starts from the power storage start timing. The charge is accumulated in the light-receiving sensor until the lapse of time, and thereafter, the charge accumulation and discharge process of discharging the charge accumulated in the light-receiving sensor until the discharge set time has elapsed is repeatedly executed,
Further, when the object to be measured conveyed by the conveyance means reaches the measurement location, the electric charge accumulated in the light receiving sensor is discharged until a set time for discharge has elapsed from that time, and then the measurement setting is performed. A fruit and vegetable quality evaluation device configured to execute a measurement charge accumulation process for accumulating charge for use as light reception information for the quality evaluation in the light reception sensor until time elapses. 前記被計測物からの透過光又は反射光が前記受光センサにて受光されることを許容する開放状態と受光されることを阻止する遮蔽状態とに切り換え自在な入射状態切換手段が備えられ、
前記制御手段が、
前記被計測物が前記計測箇所に至ると、前記遮蔽状態から前記開放状態に切り換え、且つ、その開放状態を前記計測用設定時間が経過するまで維持した後に前記遮蔽状態に戻すように前記入射状態切換手段の動作を制御するよう構成されている請求項１記載の果菜類の品質評価装置。Included is an incident state switching means that can be switched between an open state that allows transmitted light or reflected light from the object to be received by the light receiving sensor and a shielded state that prevents light from being received,
The control means,
When the object reaches the measurement point, the shielding state is switched to the open state, and the opened state is maintained until the set time for measurement elapses, and then the incident state is returned to the shielded state. The fruit and vegetable quality evaluation device according to claim 1, wherein the device is configured to control an operation of a switching unit. 前記搬送手段が、前記被計測物を受皿上の特定位置に位置させる状態で前記受皿に載置した状態で搬送するように構成され、
前記制御手段が、
前記受皿の搬送方向の先頭位置が設定位置に到達したことを検出する受皿検出手段を備えて構成され、この受皿検出手段の検出情報に基づいて前記被計測物が前記計測箇所に至ったことを判別するように構成されている請求項１又は２記載の果菜類の品質評価装置。The transport means is configured to transport the object to be measured placed on the tray in a state where the measured object is located at a specific position on the tray,
The control means,
It is provided with a tray detection means for detecting that the leading position of the tray in the transport direction has reached the set position, and based on the detection information of the tray detection means, the measurement object has reached the measurement location. 3. The apparatus for evaluating the quality of fruit and vegetables according to claim 1, wherein the apparatus is configured to determine. 前記制御手段が、
前記搬送手段にて搬送される被計測物の搬送方向の先頭位置が前記計測箇所よりも搬送方向上手側に位置する手前側位置に到達したことを検出する被計測物検出手段と、前記搬送手段による前記被計測物の搬送距離を計測する搬送距離計測手段とを備えて構成され、
前記被計測物検出手段の検出情報に基づいて前記被計測物の前記先頭位置が前記手前側位置に到達したことを検出してから前記搬送距離計測手段の検出情報に基づいて前記被計測物が前記計測箇所に至ったことを判別するように構成されている請求項１又は２記載の果菜類の品質評価装置。The control means,
A measuring object detecting means for detecting that a leading position in the conveying direction of the measuring object conveyed by the conveying means has reached a near side position located on a conveying direction upper side than the measuring point; and the conveying means Transport distance measuring means for measuring the transport distance of the object to be measured,
After detecting that the head position of the measured object has reached the near side position based on the detection information of the measured object detecting means, the measured object is detected based on the detection information of the transport distance measuring means. The fruit and vegetable quality evaluation apparatus according to claim 1 or 2, wherein the apparatus is configured to determine that the measurement point has been reached.
JP2003011091A 2002-12-24 2003-01-20 Fruit and vegetable quality evaluation equipment Expired - Fee Related JP3923018B2 (en)

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JP2003011091A JP3923018B2 (en) 2003-01-20 2003-01-20 Fruit and vegetable quality evaluation equipment
US10/540,742 US7316322B2 (en) 2002-12-24 2003-12-24 Quality evaluation apparatus for fruits and vegetables
AU2003296077A AU2003296077B2 (en) 2002-12-24 2003-12-24 Fruit-vegetable quality evaluation device
KR1020057011826A KR100798518B1 (en) 2002-12-24 2003-12-24 Fruit-vegetable quality evaluation device
PCT/JP2003/016536 WO2004059300A1 (en) 2002-12-24 2003-12-24 Fruit-vegetable quality evaluation device
CN2003801076012A CN1732379B (en) 2002-12-24 2003-12-24 Fruit-vegetable quality evaluation device

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016138789A (en) * 2015-01-27 2016-08-04 地方独立行政法人北海道立総合研究機構 Spectral imaging system
WO2019130777A1 (en) * 2017-12-29 2019-07-04 シャープ株式会社 Inspection device, inspection method, manufacturing device, control program, and recording medium

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016138789A (en) * 2015-01-27 2016-08-04 地方独立行政法人北海道立総合研究機構 Spectral imaging system
WO2019130777A1 (en) * 2017-12-29 2019-07-04 シャープ株式会社 Inspection device, inspection method, manufacturing device, control program, and recording medium

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