JP4622210B2

JP4622210B2 - Camera and camera multiple flash photography system

Info

Publication number: JP4622210B2
Application number: JP2003143125A
Authority: JP
Inventors: 勝村松
Original assignee: Nikon Corp
Current assignee: Nikon Corp
Priority date: 2003-05-21
Filing date: 2003-05-21
Publication date: 2011-02-02
Anticipated expiration: 2023-05-21
Also published as: JP2004347757A

Description

【０００１】
【発明の属する技術分野】
本発明は、複数の増灯閃光発光装置を用いたカメラ及びカメラの増灯撮影システムに関するものである。
【０００２】
【従来の技術】
従来から、複数のフラッシュライト等の増灯照明光を用いて撮影を行うカメラの増灯撮影が行われている。従来の増灯撮影では、主閃光発光装置と増灯閃光発光装置を発光させながら、測光素子により閃光の測光を行い、被写体を適正に照明するのに必要な光量となる適正値に達したら主閃光発光装置と増灯閃光発光装置の発光を停止することにより、適正露出で撮影できるように制御を行っていた（例えば、特許文献１，２参照）。
【０００３】
【特許文献１】
特公昭５８−２１７９８号公報
【特許文献２】
特開平１１−２１２１４８号公報
【０００４】
【発明が解決しようとする課題】
しかし、従来のフラッシュライトによる増灯撮影では、主要被写体が被写界のどの位置にあっても、被写界全体を対象として調光を行うので、各フラッシュライトの最適な発光量をバランスよく決定するのは困難であった。特に、主要被写体と他の被写体との距離が離れているような状況では、適正露出が得られない場合があった。
【０００５】
本発明の課題は、どのような撮影条件であっても、簡単に主要被写体を適正露出で撮影することができ、また、主要被写体以外の照明効果の高いカメラ及びカメラの増灯撮影システムを提供することである。
【０００６】
【課題を解決するための手段】
本発明は、以下のような解決手段により、前記課題を解決する。なお、理解を容易にするために、本発明の実施形態に対応する符号を付して説明するが、これに限定されるものではない。すなわち、請求項１の発明は、被写体を照明する装置であって本発光に先立って主予備発光を行う主閃光発光装置（１０）と、前記主閃光発光装置とは別の位置から被写体を照明する装置であって本発光に先立って増灯予備発光を行う少なくとも１つの増灯閃光発光装置（２０）と、を制御して増灯撮影可能なカメラであって、被写界を複数の領域に分割した分割測光領域毎に測光値を出力する測光手段（５）と、前記主予備発光時に前記測光手段により得られた主予備測光値に基づいて前記主閃光発光装置の暫定的な発光予定量である暫定主発光予定量を演算する暫定主発光予定量演算手段（６，Ｓ７）と、前記増灯予備発光時に前記測光手段により得られた増灯予備測光値に基づいて前記増灯閃光発光装置の暫定的な発光予定量である暫定増灯発光予定量を演算する暫定増灯発光予定量演算手段（６，Ｓ１３）と、前記暫定主発光予定量及び前記暫定増灯発光予定量を合わせて前記分割測光領域毎の照明予定量を演算し、前記照明予定量が被写体を適正に照明するのに必要な光量となる適正値を超えるオーバー領域がある場合に、該オーバー領域に対応する前記照明予定量に前記主閃光発光装置と前記増灯閃光発光装置が寄与する割合に応じた前記暫定主発光予定量と前記暫定増灯発光予定量を減光する割合に基づいて、前記オーバー領域の照明予定量が前記適正値になるように、前記主閃光発光装置の本発光予定量である主本発光予定量、及び、前記増灯閃光発光装置の本発光予定量である増灯本発光予定量を演算する本発光量演算手段（６，Ｓ１４）と、を備えるカメラである。
【０００７】
請求項２の発明は、請求項１に記載のカメラにおいて、前記本発光量演算手段（６，Ｓ１４）は、前記オーバー領域が複数存在する場合には、照明予定量が最も大きい領域が前記適正値となるように前記主本発光予定量及び前記増灯本発光予定量を演算すること、を特徴とするカメラである。
【０００８】
請求項３の発明は、請求項１又は請求項２に記載のカメラにおいて、前記本発光量演算手段（６，Ｓ１４）は、前記オーバー領域が複数存在する場合には、前記主本発光予定量及び前記増灯本発光予定量を演算後に、その演算した前記主本発光予定量及び前記増灯本発光予定量を前記暫定主発光予定量及び暫定増灯発光予定量であるとして（Ｓ３８）前記主本発光予定量及び前記増灯本発光予定量を演算する動作を前記オーバー領域がなくなるまで繰り返し行うこと、を特徴とするカメラである。
【０００９】
請求項４の発明は、請求項１から請求項３までのいずれか１項に記載のカメラにおいて、前記暫定主発光予定量演算手段（６，Ｓ７）及び／又は前記暫定増灯発光予定量演算手段（６，Ｓ１３）は、前記主閃光発光装置（１０）及び／又は前記増灯閃光発光装置（２０）の発光能力が、それぞれ、前記暫定主発光予定量及び／又は暫定増灯発光予定量に対して不足である場合には、その不足度合いに応じて前記主予備測光値及び／又は前記増灯予備測光値を少なく見積もり、前記発光能力が不足している前記主閃光発光装置及び／又は前記増灯閃光発光装置の最大発光可能光量を前記暫定主発光予定量及び／又は暫定増灯発光予定量とすること、を特徴とするカメラである。
【００１０】
請求項５の発明は、被写体を照明する装置であって本発光に先立って主予備発光を行う主閃光発光装置（１０）と、前記主閃光発光装置とは別の位置から被写体を照明する装置であって本発光に先立って増灯予備発光を行う少なくとも１つの増灯閃光発光装置（２０）と、被写界を複数の領域に分割した分割測光領域毎に測光値を出力する測光手段（５）と、前記主予備発光時に前記測光手段により得られた主予備測光値に基づいて前記主閃光発光装置の暫定的な発光予定量である暫定主発光予定量を演算する暫定主発光予定量演算手段（６，Ｓ７）と、前記増灯予備発光時に前記測光手段により得られた増灯予備測光値に基づいて前記増灯閃光発光装置の暫定的な発光予定量である暫定増灯発光予定量を演算する暫定増灯発光予定量演算手段（６，Ｓ１３）と、前記暫定主発光予定量及び前記暫定増灯発光予定量を合わせて前記分割測光領域毎の照明予定量を演算し、前記照明予定量が被写体を適正に照明するのに必要な光量となる適正値を超えるオーバー領域がある場合に、前記暫定主発光予定量と前記暫定増灯発光予定量の内前記オーバー領域を照明する寄与率の高い側ほど発光予定量を多く減少させることにより前記オーバー領域の照明予定量が前記適正値になるように、前記主閃光発光装置の本発光予定量である主本発光予定量、及び、前記増灯閃光発光装置の本発光予定量である増灯本発光予定量を演算する本発光量演算手段（６，Ｓ１４）と、を備えるカメラの増灯撮影システムである。
【００１１】
請求項６の発明は、請求項５に記載のカメラの増灯撮影システムにおいて、前記本発光量演算手段（６，Ｓ１４）は、前記オーバー領域が複数存在する場合には、照明予定量が最も大きい領域が前記適正値となるように前記主本発光予定量及び前記増灯本発光予定量を演算すること、を特徴とするカメラの増灯撮影システムである。
【００１２】
請求項７の発明は、請求項５又は請求項６に記載のカメラの増灯撮影システムにおいて、前記本発光量演算手段（６，Ｓ１４）は、前記オーバー領域が複数存在する場合には、前記主本発光予定量及び前記増灯本発光予定量を演算後に、その演算した前記主本発光予定量及び前記増灯本発光予定量を前記暫定主発光予定量及び暫定増灯発光予定量であるとして（Ｓ３８）前記主本発光予定量及び前記増灯本発光予定量を演算する動作を前記オーバー領域がなくなるまで繰り返し行うこと、を特徴とするカメラの増灯撮影システムである。
【００１３】
請求項８の発明は、請求項５から請求項７までのいずれか１項に記載のカメラの増灯撮影システムにおいて、前記暫定主発光予定量演算手段（６，Ｓ７）及び／又は前記暫定増灯発光予定量演算手段（６，Ｓ１３）は、前記主閃光発光装置（１０）及び／又は前記増灯閃光発光装置（２０）の発光能力が、それぞれ、前記暫定主発光予定量及び／又は暫定増灯発光予定量に対して不足である場合には、その不足度合いに応じて前記主予備測光値及び／又は前記増灯予備測光値を少なく見積もり、前記発光能力が不足している前記主閃光発光装置及び／又は前記増灯閃光発光装置の最大発光可能光量を前記暫定主発光予定量及び／又は暫定増灯発光予定量とすること、を特徴とするカメラの増灯撮影システムである。
【００１４】
【発明の実施の形態】
以下、図面等を参照しながら、本発明の実施の形態について、さらに詳しく説明する。
（第１実施形態）
図１は、本発明によるカメラの実施形態の構成を示す図である。
本実施形態におけるカメラは、絞り２及び距離検出装置３を含む撮影レンズ１、クイックリターンミラー４、測光センサー５、制御装置６等を備え、主フラッシュライト１０及び増灯フラッシュライト２０を制御可能なカメラである。
距離検出装置３は、エンコーダ等で構成された撮影距離検出手段であり、撮影レンズ１の合焦時のレンズ位置をエンコーダにより検出し、撮影距離を検出する装置である。
測光センサー５は、撮影レンズ１を通した被写界を複数の領域に分割した分割測光領域毎に測光値を出力する測光手段である。
図２は、測光センサー５を用いた撮影画面の測光領域を示す図である。
測光センサー５は、被写界を領域５１〜５５に分割し、それぞれの領域毎の光量を測光し、制御装置６に伝える。
制御装置６は、マイクロプロセッサからなり、カメラの各種制御を行う部分であり、本実施形態では、暫定主発光予定量演算手段、暫定増灯発光予定量演算手段、本発光量演算手段等の役割を果たしている。
【００１５】
主フラッシュライト１０は、主発光管制御装置１１と主発光管１２とを有した主閃光発光装置であり、本実施形態では、カメラに直接接続されている。なお、本実施形態では、主フラッシュライト１０は、カメラに対して着脱自在な別ユニットであるが、予めカメラに設けられているフラッシュライトでもよい。
増灯フラッシュライト２０は、増灯発光管制御装置２１と増灯発光管２２とを有した増灯閃光発光装置であり、本実施形態では、増灯ケーブル１１を介してカメラと接続されており、主フラッシュライト１０とは別の位置から被写体を照明する。なお、増灯フラッシュライト２０は、増灯ケーブル１１を介してカメラと接続せずに、ワイヤレス制御とすることもできる。
【００１６】
次に、本実施形態におけるカメラの動作について説明する。
図３は、本実施形態におけるカメラの動作を示すフローチャートである。なお、特に示さない限り、図３に示す動作は、制御装置６の制御により行われ、各種演算は、制御装置６が実行する。
不図示のシャッターレリーズボタンの押下により撮影動作が開始されると以下のステップ（以下、Ｓとする）が実行される。
Ｓ１では、測光センサー５の５つの領域５１〜５５における定常光成分ａ１１〜ａ１５の測定と保存、及び、撮影距離Ｄの取得を行う。
Ｓ２では、測光センサー５により主フラッシュライト１０の主モニター発光の測光を開始する。
Ｓ３では、主フラッシュライト１０の主モニター発光（主予備発光）を行う。この主フラッシュライト１０の主モニター発光では、主発光管１２を所定の小さな発光量のガイドナンバーｐ１で発光させる。このガイドナンバーｐ１は、カメラ側から指定するか、又は、主フラッシュライト１０側で予め設定された値をカメラ側に伝達するようにする。
【００１７】
Ｓ４では、主モニター発光の測光完了とともに測光センサー５の５領域の一時的な測光値（主予備測光値）ｔ１１〜ｔ１５の取得を行う。
Ｓ５では、測光センサー５で主フラッシュライト１０のモニター発光の直前、又は、直後に測光した定常光成分をａ１１〜ａ１５とし、以下の数１に示すように、測光値ｔ１１〜ｔ１５から定常光成分ａ１１〜ａ１５を引くことにより、純粋な主フラッシュライト１０の主モニター発光での５個の領域の反射光量ｂ１１〜ｂ１５を演算する。
【００１８】
【数１】

【００１９】
Ｓ６では、主フラッシュライト１０の照射分布Ｉ１１〜Ｉ１５の演算を行う。
ここで、照射分布Ｉ１１〜Ｉ１５は、主フラッシュライト１０により最も明るく照明されている（反射光量が最大の）領域を基準とし、その領域の反射光量に対する各領域の反射光量の比率として求める。
まず、主要被写体は、最もカメラに近い場所に存在するとして、この中の最大値を返す領域を調光対象領域とし、最大反射光量ｂ１ｍａｘを以下のようにして得る。
【００２０】
【数２】

【００２１】
最大反射光量ｂ１ｍａｘが得られたら、調光領域を最大値で正規化し主フラッシュライト１０の各領域の照射分布Ｉ１１〜Ｉ１５を以下のように演算する。
【００２２】
【数３】

【００２３】
Ｓ７では、主フラッシュライト１０の暫定の撮影時発光量（暫定主発光予定量）となるガイドナンバーｔｇｎ１の演算を行う。具体的には、先に決定した調光対象領域に対して適性発光量となるように、主フラッシュライト１０のｔｇｎ１を以下の式により求める。
【００２４】
【数４】

【００２５】
Ｓ８では、増灯フラッシュライト２０の増灯モニター発光の測光を開始する。
Ｓ９では、増灯フラッシュライト２０の増灯モニター発光（増灯予備発光）を行う。この増灯モニター発光では、増灯発光管２２を所定の小さな発光量のガイドナンバーｐ２で発光させる。
Ｓ１０では、増灯モニター発光の測光を完了すると共に、測光センサー５の５領域の一時的な測光値（増灯予備測光値）ｔ２１〜ｔ２５を取得する。
Ｓ１１では、測光センサー５増灯フラッシュライト２０のモニター発光の直前、又は、直後に測光した定常光成分をａ２１〜ａ２５とし、以下の数５に示すように、測光値ｔ２１〜ｔ２５から定常光成分ａ２１〜ａ２５を引くことにより純粋な増灯モニター発光での５個の領域の増灯フラッシュライト２０の反射光量ｂ２１〜ｂ２５を得る。なお、主モニター発光を行うＳ３と増灯モニター発光を行うＳ９との間隔は、きわめて短い時間間隔で行われるので、定常光成分ａ２１〜ａ２５を新たに測定せずに、既に測定している定常光成分ａ１１〜ａ１５を定常光成分ａ２１〜ａ２５とみなして演算を行ってもよい。
【００２６】
【数５】

【００２７】
Ｓ１２では、増灯フラッシュライト２０の照射分布Ｉ２１〜Ｉ２５の演算を行う。
ここで、照射分布Ｉ２１〜Ｉ２５は、主フラッシュライト１０の場合と同様に、主要被写体は、最もカメラに近い場所に存在するとして、この中の最大値を返す領域を調光対象領域とし、最大反射光量ｂ２ｍａｘを以下のようにして得る。
【００２８】
【数６】

【００２９】
最大反射光量ｂ２ｍａｘが得られたら、調光領域を最大値で正規化し増灯フラッシュライト２０の各領域の照射分布Ｉ２１〜Ｉ２５を以下のように演算する。
【００３０】
【数７】

【００３１】
Ｓ１３では、増灯フラッシュライト２０の暫定の撮影時発光量（暫定増灯発光予定量）となるガイドナンバーｔｇｎ２の演算を行う。具体的には、先に決定した調光対象領域に対して適性発光量となるように、増灯フラッシュライト２０のｔｇｎ２を以下の式により求める。
【００３２】
【数８】

【００３３】
Ｓ１４では、本発光量の演算を行う。ここで行う本発光量の演算は、主フラッシュライト１０と増灯フラッシュライト２０が各調光対象領域でオーバーラップした（両フラッシュライトにより照明される領域が重なった）ときにも適正露光になるように前述の暫定ガイドナンバーの減光量の演算を行うことにより行われる。
図４は、第１実施形態における本発光量演算の動作の流れを示すフローチャートである。
Ｓ２１では、各領域において、主フラッシュライト１０と増灯フラッシュライト２０との照射分布を合計する。
【００３４】
【数９】

【００３５】
このようにして求めたＩｓｕｍ１〜Ｉｓｕｍ５の値は、上記ガイドナンバーｔｇｎ１，ｔｇｎ２で主フラッシュライト１０と増灯フラッシュライト２０とが本発光時に発光したときの照度分布を示すこととなる。Ｉｓｕｍ１〜Ｉｓｕｍ５の値が１となる領域があれば、その領域の露出は適正となる（主フラッシュライト１０と増灯フラッシュライト２０との照明量が適正値）ことを示し、１よりも大きければ露出オーバーを示し、１よりも小さければ露出アンダーを示す。
Ｓ２２では、Ｉｓｕｍ１〜Ｉｓｕｍ５の中の最大値Ｉｍａｘと最大値を返す領域ｍｐｏｓを求める。
【００３６】
【数１０】

【００３７】
Ｓ２３では、最大値Ｉｍａｘが１を超えるか否かを判断し、最大値Ｉｍａｘが１を超えるときにはＳ２４へ進み、最大値Ｉｍａｘが１を超えない場合はＳ２６へ進む。
Ｓ２４では、寄与率が高いフラッシュライトほど減光量が多くなるように減光量（減光する割合）を決定する。具体的には、まず、Ｓ２２において求めたＩｍａｘより以下に示すｄｎを演算する。
【００３８】
【数１１】

【００３９】
このｄｎより主フラッシュライト１０と増灯フラッシュライト２０を減光する割合を求める。合計が最大となる領域ｍｐｏｓに主フラッシュライト１０と増灯フラッシュライト２０が寄与する割合に応じて（寄与する割合が高いフラッシュライトほど減光量が多くなるように）減光する割合を求める。例えば領域ｍｐｏｓが中央部の５１なら、以下のようになる。
【００４０】
【数１２】

【００４１】
Ｓ２５では、Ｋｄｎ１、Ｋｄｎ２を用いて、先に求めた主フラッシュライト１０の暫定のガイドナンバーｔｇｎ１、増灯フラッシュライト２０の暫定のガイドナンバーｔｇｎ２を減光し、撮影時の（本発光時の）主フラッシュライト１０と増灯フラッシュライト２０のガイドナンバーｇｎ１，ｇｎ２を求める。
【００４２】
【数１３】

【００４３】
Ｓ２６では、ｔｇｎ１、ｔｇｎ２を撮影時のガイドナンバーｇｎ１，ｇｎ２とする。
図３に戻って、Ｓ１５では、シャッターを開放する。
Ｓ１６では、主フラッシュライト１０をガイドナンバーｇｎ１で、増灯フラッシュライト２０をガイドナンバーｇｎ２で発光する。
Ｓ１７では、シャッターを閉じて、増灯撮影を終了する。
【００４４】
ここで、本実施形態において、領域ｍｐｏｓに主フラッシュライト１０と増灯フラッシュライト２０が寄与する割合に応じて（寄与する割合が高いフラッシュライトほど減光量が多くなるように）減光する割合を求め、この割合に基づいてガイドナンバーｇｎ１，ｇｎ２を求めるようにした理由について説明する。
図５は、図２に示した撮影画面の測光領域を示す図に重ねて撮影画面の一例を示した図である。
主フラッシュライト１０は、主に人物１２を照明し、増灯フラッシュライト２０は、主に背景１３を照明し、それぞれの照明光（閃光）は、人物１２及び背景１３の両方を照明している場合を想定する。
【００４５】
ここで、主フラッシュライト１０の方が増灯フラッシュライト２０よりも、主要被写体である人物１２を照明する寄与率が高いとする。このとき、人物１２を適正露出にするために、先に求めた暫定のガイドナンバーｔｇｎ１，ｔｇｎ２のうち、増灯フラッシュライト２０のｔｇｎ２を多く減光したり、ｔｇｎ１，ｔｇｎ２を同量減光したり、ｔｇｎ１，ｔｇｎ２を同じ割合で減光したりして（本実施形態と異なる減光量の決め方を行って）、本発光のガイドナンバーを決めてしまったとすると、人物１２については、適正露出が得られるが、背景１３を照明している増灯フラッシュライト２０のガイドナンバーの減光量が大きいので、背景１３については、露出不足となってしまう。
【００４６】
そこで、本実施形態では、人物１２（主要被写体）の照明に寄与する割合に応じて（寄与する割合が高いフラッシュライトほど減光量が多くなるように）減光することとして、背景１３を主に照明する増灯フラッシュライト２０のガイドナンバーをなるべく大きな値とし、人物１２を適正露出としながらも、背景１３の照明光効果も十分に得るようにしている。
【００４７】
本実施形態によれば、複数のフラッシュライトを用いる増灯撮影において、どのような位置関係でフラッシュライトを配置しても自動的に最適な光量比で発光量が決定され、優れた増灯撮影の写真を容易に撮影することができる。
【００４８】
（第２実施形態）
第２実施形態は、第１実施形態におけるＳ１４（本発光量の演算動作）を改良した形態であるので、第１実施形態と同様の機能を果たす部分には、同一の符号を付して、重複する説明を適宜省略する。
図６は、第２実施形態における本発光量の演算動作の流れを示すフローチャートである。このフローチャートにおいて、Ｓ３１〜Ｓ３６は、第１実施形態におけるＳ２１〜Ｓ２６と同様な動作を行う。
【００４９】
Ｓ３７では、Ｓ３１において得られた照射分布の合計Ｉｓｕｍ１〜Ｉｓｕｍ５の値が１を超える領域が複数あるか否かを判断する。１を超える領域が複数ある場合には、Ｓ３８へ進み、１ヵ所のみの場合には、Ｓ１５（図３）へ戻る。
Ｉｓｕｍ１〜Ｉｓｕｍ５の値が１を超えている領域は、減光を行わないと露出オーバーとなる領域である。そこで、第１実施形態では、最大となる領域が１を超えているときに、その領域で適正露出が得られるように、減光を行った。
【００５０】
しかし、Ｉｓｕｍ１〜Ｉｓｕｍ５の値が１を超える領域が複数ある場合には、最大となる領域のみを適正値とする（Ｉｍａｘを１とする）だけでは、他の領域が必ず１を超えない（露出オーバーにならない）とは限らない。
そこで、本実施形態では、Ｉｓｕｍ１〜Ｉｓｕｍ５の値が１を超える領域が複数ある場合には、Ｓ３８へ進み、Ｓ３５において得られたｇｎ１，ｇｎ２を暫定のガイドナンバーのｔｇｎ１，ｔｇｎ２であるとして（ｔｇｎ１＝ｇｎ１，ｔｇｎ２＝ｇｎ２）、Ｓ３１からの動作を再度繰り返して行う。
この動作を繰り返して、１を超える領域がなくなれば、露出オーバーとなる領域が発生することを避けることができる。
【００５１】
本実施形態によれば、Ｉｓｕｍ１〜Ｉｓｕｍ５の値が１を超える領域が複数ある場合に、本発光量の演算動作を繰り返し行うので、露出オーバーとなる領域が発生せず、良好な撮影結果を得ることができる。
【００５２】
（第３実施形態）
第３実施形態は、第１実施形態をさらに改良した形態であるので、第１実施形態と同様の機能を果たす部分には、同一の符号を付して、重複する説明を適宜省略する。
図７は、第３実施形態におけるカメラの動作を示すフローチャートである。このフローチャートにおいて、Ｓ１０１〜Ｓ１０７，Ｓ１１１〜Ｓ１１６，Ｓ１２０〜Ｓ１２３は、それぞれ、第１実施形態におけるＳ１〜Ｓ７，Ｓ８〜Ｓ１３，Ｓ１２０〜Ｓ１２３と同様な動作を行うので、ここでは、第１実施形態と動作が異なるＳ１０８〜Ｓ１１０及びＳ１１７〜Ｓ１１９についてのみ説明を行う。
【００５３】
Ｓ１０８では、主フラッシュライト１０の発光能力限界である最大ガイドナンバーｇｎｍａｘ１と演算した暫定のガイドナンバーｔｇｎ１とを比較する。ｔｇｎ１がｇｎｍａｘ１よりも大きい場合には、Ｓ１０９へ進み、それ以外の場合には、Ｓ１１１へ進む。
【００５４】
Ｓ１０９では、主フラッシュライト１０の照射分布Ｉ１１〜Ｉ１５の修正を行う。このステップに進んできたと言うことは、主フラッシュライト１０では、演算した暫定のガイドナンバーｔｇｎ１を発光する能力が不足しているということである。したがって、ここで行う照射分布Ｉ１１〜Ｉ１５の修正とは、具体的には、以下の演算を行い、発光能力が不足している度合いに応じて照射分布Ｉ１１〜Ｉ１５を少なく見積もる。
【００５５】
【数１４】

【００５６】
このようにすることにより、主フラッシュライト１０の照射分布Ｉ１１〜Ｉ１５が発光能力に応じて適正な値となる。
Ｓ１１０では、ｔｇｎ１にｇｎｍａｘ１を代入し、暫定のガイドナンバーを主フラッシュライト１０の発光能力限界である最大ガイドナンバーとする。
以下、Ｓ１１１〜Ｓ１１６は、第１実施形態におけるＳ８〜Ｓ１３と同様な動作を行う。
【００５７】
Ｓ１１７では、増灯フラッシュライト２０の発光能力限界である最大ガイドナンバーｇｎｍａｘ２と演算した暫定のガイドナンバーｔｇｎ２とを比較する。ｔｇｎ２がｇｎｍａｘ２よりも大きい場合には、Ｓ１１８へ進み、それ以外の場合には、Ｓ１２０へ進む。
【００５８】
Ｓ１１８では、増灯フラッシュライト２０の照射分布Ｉ２１〜Ｉ２５の修正を行う。このステップに進んできたと言うことは、増灯フラッシュライト２０では、演算した暫定のガイドナンバーｔｇｎ２を発光する能力が不足しているということである。したがって、ここで行う照射分布Ｉ２１〜Ｉ２５の修正とは、具体的には、以下の演算を行い、発光能力が不足している度合いに応じて照射分布Ｉ２１〜Ｉ２５を少なく見積もる。
【００５９】
【数１５】

【００６０】
このようにすることにより、増灯フラッシュライト２０の照射分布Ｉ２１〜Ｉ２５が発光能力に応じて適正な値となる。
Ｓ１１９では、ｔｇｎ２にｇｎｍａｘ２を代入し、暫定のガイドナンバーを増灯フラッシュライト２０の発光能力限界である最大ガイドナンバーとする。
【００６１】
本実施形態によれば、フラッシュライトの発光能力に応じて照射分布を決めて（修正して）いる。つまり、演算された照射分布の合計ではなく、実際に照射可能な照射分布の合計に基づいて露出の判断を行っているので、主フラッシュライト１０又は増灯フラッシュライト２０の少なくとも一方の暫定ガイドナンバーが発光能力を超えてしまっている場合であっても、適正な発光量を得ることも可能になる。
【００６２】
（変形形態）
以上説明した実施形態に限定されることなく、種々の変形や変更が可能であって、それらも本発明の均等の範囲内である。
例えば、各実施形態において、主フラッシュライト１０と増灯フラッシュライト２０の２台のフラッシュライトを使用する例を示したが、これに限らず、例えば、増灯フラッシュライトの台数をさらに多くしてもよい。
【００６３】
【発明の効果】
以上詳しく説明したように、本発明によれば、以下の効果を奏することができる。
（１）暫定主発光予定量及び暫定増灯発光予定量を合わせて分割測光領域毎の照明予定量を演算し、照明予定量が被写体を適正に照明するのに必要な光量となる適正値を超えるオーバー領域がある場合に、暫定主発光予定量と暫定増灯発光予定量の内オーバー領域を照明する寄与率の高い側ほど発光予定量を多く減少させることによりオーバー領域の照明予定量が適正値になるように、主閃光発光装置の本発光予定量である主本発光予定量、及び、増灯閃光発光装置の本発光予定量である増灯本発光予定量を演算するので、複数のフラッシュライトを用いた撮影において、各フラッシュライトの配置を自由に行っても、自動的に最適な光量比により撮影を行うことができる。
【００６４】
（２）本発光量演算手段は、オーバー領域が複数存在する場合には、照明予定量が最も大きい領域が適正値となるように主本発光予定量及び増灯本発光予定量を演算するので、演算負荷を増加させることなく、簡単に最適な発光量を演算することができる。
【００６５】
（３）本発光量演算手段は、オーバー領域が複数存在する場合には、主本発光予定量及び増灯本発光予定量を演算後に、その演算した主本発光予定量及び増灯本発光予定量を暫定主発光予定量及び暫定増灯発光予定量であるとして主本発光予定量及び増灯本発光予定量を演算する動作をオーバー領域がなくなるまで繰り返し行うので、露出オーバーとなる領域が発生することを完全に防止することができる。
【００６６】
（４）暫定主発光予定量演算手段及び／又は暫定増灯発光予定量演算手段（６，Ｓ１３）は、前記主閃光発光装置（１０）及び／又は前記増灯閃光発光装置（２０）の発光能力が、それぞれ、前記暫定主発光予定量及び／又は暫定増灯発光予定量に対して不足である場合には、その不足度合いに応じて前記主予備測光値及び／又は前記増灯予備測光値を少なく見積もり、前記主閃光発光装置及び／又は前記増灯閃光発光装置の最大発光可能光量を前記暫定主発光予定量及び／又は暫定増灯発光予定量とするので、フラッシュライトから被写体までの距離が遠かったり、小型のフラッシュライトを使用したりしても、露出不足となることを避けることができる。したがって、フラッシュライトの発光能力、フラッシュライトから被写体までの距離等を気にしなくとも、簡単に適正露出の撮影を行うことができる。
【図面の簡単な説明】
【図１】本発明によるカメラの実施形態の構成を示す図である。
【図２】測光センサー５を用いた撮影画面の測光領域を示す図である。
【図３】本実施形態におけるカメラの動作を示すフローチャートである。
【図４】第１実施形態における本発光量演算の動作の流れを示すフローチャートである。
【図５】図２に示した撮影画面の測光領域を示す図に重ねて撮影画面の一例を示した図である。
【図６】第２実施形態における本発光量の演算動作の流れを示すフローチャートである。
【図７】第３実施形態における本発光量の演算動作の流れを示すフローチャートである。
【符号の説明】
１撮影レンズ
２絞り
３距離検出装置
４クイックリターンミラー
５測光センサー
６制御装置
１０主フラッシュライト
１１主発光管制御装置
１２主発光管
２０増灯フラッシュライト
２１増灯発光管制御装置
２２増灯発光管[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a camera using a plurality of flash-flash devices and a camera-multiple flash shooting system.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, multiple-flash photography has been performed on cameras that perform photography using multiple illumination lights such as a plurality of flashlights. In conventional multi-flash photography, the main flash light emitting device and the multiple flash light emitting device emit light, the flash metering is performed with the photometric element, and the main light is reached when the light intensity reaches the required level to properly illuminate the subject. The flash light emitting device and the flashlight flash light emitting device are stopped so as to be able to take a picture with appropriate exposure (for example, see Patent Documents 1 and 2).
[0003]
[Patent Document 1]
Japanese Patent Publication No.58-21798
[Patent Document 2]
JP-A-11-212148
[0004]
[Problems to be solved by the invention]
However, in conventional multiple flash photography with flashlight, dimming is performed for the entire subject regardless of the position of the main subject in the scene, so the optimal amount of light emitted by each flashlight is balanced. It was difficult to decide. In particular, in a situation where the distance between the main subject and another subject is large, there is a case where proper exposure cannot be obtained.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide a camera with a high lighting effect other than the main subject and a camera flashing system that can easily shoot the main subject with appropriate exposure under any shooting conditions. It is to be.
[0006]
[Means for Solving the Problems]
The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this. That is, the invention of claim 1 is a device for illuminating a subject, and illuminates the subject from a position different from the main flash light emitting device (10) that performs main preliminary light emission prior to the main light emission. And a camera capable of performing multiple-flash photography by controlling at least one flash-flash light-emitting device (20) that performs pre-flashes prior to the main flash, and the object field is divided into a plurality of areas. A metering means (5) for outputting a metered value for each of the divided metering areas, and a provisional light emission schedule of the main flash light emitting device based on the main preliminary metering value obtained by the photometric means during the main preliminary light emission Temporary main light emission scheduled amount calculation means (6, S7) for calculating a provisional main light emission scheduled amount, which is a quantity, and the light increase flash based on the light increase preliminary light measurement value obtained by the light measurement means during the light increase preliminary light emission Temporary scheduled light emission amount of the light emitting device A provisional light increase scheduled light emission amount calculation means (6, S13) for calculating a light increase scheduled light emission amount, and the provisional main light emission scheduled amount and the provisional light increase planned light emission amount are combined to calculate the illumination planned amount for each of the divided photometry areas. When there is an over area that exceeds the appropriate value that is the amount of light required to properly illuminate the subject, the main flash light emitting device and the main flash light emitting device and the planned illumination quantity corresponding to the over area Based on the ratio of the provisional main light emission scheduled amount and the provisional light increase light emission planned amount dimming according to the ratio contributed by the flashlight flash light emitting device, In order for the planned illumination amount in the over area to be the appropriate value, A main light emission amount calculation means (6, 6) that calculates a main main light emission scheduled amount that is a main light emission scheduled amount of the main flash light emitting device and an increased main light emission scheduled amount that is a main light emission scheduled amount of the additional flash light emitting device. S14).
[0007]
According to a second aspect of the present invention, in the camera according to the first aspect, the main light emission amount calculating means (6, S14) is configured such that when there are a plurality of the over regions, the region with the largest illumination amount is the appropriate The main main light emission scheduled amount and the additional lamp main light emission scheduled amount are calculated so as to be values.
[0008]
According to a third aspect of the present invention, in the camera according to the first or second aspect, the main light emission amount calculating means (6, S14) is configured to increase the main main light emission amount when there are a plurality of the over regions. And calculating the main light emission scheduled amount and the calculated main light emission scheduled amount as the provisional main light emission scheduled amount and the provisional light increase scheduled light amount (S38) The camera is characterized in that the operation of calculating a main main light emission scheduled amount and the increased lamp main light emission scheduled amount is repeatedly performed until the over region disappears.
[0009]
According to a fourth aspect of the present invention, in the camera according to any one of the first to third aspects, the provisional main light emission scheduled amount calculation means (6, S7) and / or the provisional light increase scheduled light emission amount calculation. The means (6, S13) is arranged such that the light emission capability of the main flash light emitting device (10) and / or the additional flash light emitting device (20) is the provisional main light emission scheduled amount and / or the provisional additional light emission scheduled amount, respectively. If the amount is insufficient, the main preliminary photometric value and / or the extra light preliminary photometric value are estimated to be small according to the degree of the shortage, The light-emitting ability is insufficient In the camera, the maximum amount of light that can be emitted from the main flash light-emitting device and / or the additional flash light-emitting device is set as the provisional main light emission scheduled amount and / or provisional additional light emission scheduled amount.
[0010]
The invention of claim 5 is an apparatus for illuminating a subject, which is a main flash light emitting device (10) that performs main preliminary light emission prior to main light emission, and an apparatus that illuminates the subject from a position different from the main flash light emitting device. And at least one additional flashlight emitting device (20) for performing preliminary light emission prior to the main light emission, and photometric means for outputting a photometric value for each divided photometric area obtained by dividing the object field into a plurality of areas ( 5) and a provisional main light emission scheduled amount for calculating a provisional main light emission scheduled amount that is a provisional light emission amount of the main flash light emitting device based on the main preliminary light measurement value obtained by the photometry means at the time of the main preliminary light emission. Temporary increase lamp emission schedule which is a provisional emission scheduled amount of the flashlight flash light emitting device based on the calculation lamp (6, S7) and the preliminary light increase metering value obtained by the photometry means at the time of preliminary increase lamp emission Calculates the amount of light that will be temporarily emitted in order to calculate the amount of light. (6, S13) and the provisional main light emission scheduled amount and the provisional additional light emission scheduled light amount are combined to calculate the illumination planned amount for each of the divided photometric areas, and the illumination planned amount appropriately illuminates the subject. When there is an over region that exceeds the appropriate value for the required amount of light, the planned amount of light emission decreases more as the contribution ratio that illuminates the over region out of the provisional main light emission scheduled amount and the provisional additional lamp light emission amount increases. So that the planned amount of illumination of the over flash region is the appropriate value, and the planned amount of main emission of light that is the scheduled amount of main emission of the main flash light emitting device, and the planned amount of main emission of the flashlight flash light emitting device. And a main light emission amount calculation means (6, S14) for calculating a light increase scheduled light emission amount.
[0011]
According to a sixth aspect of the present invention, in the multiple-flash photographing system for a camera according to the fifth aspect, the main light emission amount calculating means (6, S14) has the highest planned illumination amount when there are a plurality of the over regions. The main flash emission scheduled amount and the increased additional flash emission amount are calculated so that a large area becomes the appropriate value.
[0012]
According to a seventh aspect of the present invention, in the multiple-flash photographing system for a camera according to the fifth or sixth aspect, the main light emission amount calculating means (6, S14) is configured such that when there are a plurality of the over regions, After calculating the main light emission scheduled amount and the additional lamp main light emission scheduled amount, the calculated main main light emission scheduled amount and the additional lamp main light emission scheduled amount are the provisional main light emission scheduled amount and the provisional additional light emission scheduled amount. (S38) A camera multiple-flash photography system, characterized in that the operation of calculating the main main light emission scheduled amount and the increased main light emission scheduled amount is repeatedly performed until the over region disappears.
[0013]
According to an eighth aspect of the present invention, in the multiple-flash photographing system for a camera according to any one of the fifth to seventh aspects, the provisional main light emission scheduled amount calculating means (6, S7) and / or the temporary increase. The scheduled light emission amount calculation means (6, S13) is configured such that the light emission capability of the main flash light emitting device (10) and / or the additional flash light emitting device (20) is the provisional main light emission scheduled amount and / or provisional, respectively. If it is insufficient with respect to the scheduled increase amount of light emission, estimate the main preliminary photometry value and / or the preliminary increase light measurement value less according to the degree of the shortage, The light-emitting ability is insufficient A camera multiple-flash photographing system, characterized in that the maximum amount of light that can be emitted from the main flash light emitting device and / or the additional flash light emitting device is set as the provisional main light emission scheduled amount and / or provisional additional light emission scheduled amount. is there.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings.
(First embodiment)
FIG. 1 is a diagram showing the configuration of an embodiment of a camera according to the present invention.
The camera in this embodiment includes a photographing lens 1 including an aperture 2 and a distance detection device 3, a quick return mirror 4, a photometric sensor 5, a control device 6, and the like, and can control the main flashlight 10 and the additional flashlight 20. It is a camera.
The distance detection device 3 is a photographing distance detection means configured by an encoder or the like, and is a device that detects a photographing distance by detecting the lens position when the photographing lens 1 is in focus with the encoder.
The photometric sensor 5 is a photometric unit that outputs a photometric value for each divided photometric area obtained by dividing the object scene that has passed through the photographing lens 1 into a plurality of areas.
FIG. 2 is a diagram showing a photometric area of a photographing screen using the photometric sensor 5.
The photometric sensor 5 divides the object scene into regions 51 to 55, measures the amount of light for each region, and transmits the light to the control device 6.
The control device 6 includes a microprocessor and is a part that performs various control of the camera. In the present embodiment, the role of the provisional main light emission scheduled amount calculation means, the provisional light increase scheduled light emission amount calculation means, the main light emission amount calculation means, and the like. Plays.
[0015]
The main flashlight 10 is a main flash light emitting device having a main arc tube control device 11 and a main arc tube 12 and is directly connected to the camera in this embodiment. In the present embodiment, the main flashlight 10 is a separate unit that is detachable from the camera, but may be a flashlight provided in advance in the camera.
The flashlight flashlight 20 is a flashlight flashlight device having a flashlight tube controller 21 and a flashlight tube 22, and in this embodiment, is connected to a camera via a flashlight cable 11. The subject is illuminated from a position different from the main flashlight 10. Note that the additional flashlight 20 can be wirelessly controlled without being connected to the camera via the additional cable 11.
[0016]
Next, the operation of the camera in this embodiment will be described.
FIG. 3 is a flowchart showing the operation of the camera in this embodiment. Unless otherwise indicated, the operation shown in FIG. 3 is performed under the control of the control device 6, and various calculations are executed by the control device 6.
When a shooting operation is started by pressing a shutter release button (not shown), the following steps (hereinafter referred to as S) are executed.
In S <b> 1, measurement and storage of the steady light components a <b> 11 to a <b> 15 in the five regions 51 to 55 of the photometric sensor 5 and acquisition of the shooting distance D are performed.
In S2, photometry of the main monitor light emission of the main flashlight 10 is started by the photometry sensor 5.
In S3, main monitor light emission (main preliminary light emission) of the main flashlight 10 is performed. In the main monitor light emission of the main flashlight 10, the main arc tube 12 is caused to emit light with a guide number p1 having a predetermined small light emission amount. The guide number p1 is designated from the camera side, or a value preset on the main flashlight 10 side is transmitted to the camera side.
[0017]
In S4, temporary photometric values (main preliminary photometric values) t11 to t15 in five areas of the photometric sensor 5 are acquired upon completion of photometry of the main monitor light emission.
In S5, the steady light components measured immediately before or immediately after the monitor light emission of the main flashlight 10 by the photometric sensor 5 are a11 to a15, and the steady light components from the photometric values t11 to t15 as shown in Equation 1 below. By subtracting a11 to a15, the reflected light amounts b11 to b15 of the five regions in the main monitor light emission of the pure main flashlight 10 are calculated.
[0018]
[Expression 1]

[0019]
In S6, the irradiation distributions I11 to I15 of the main flashlight 10 are calculated.
Here, the irradiation distributions I11 to I15 are obtained as a ratio of the reflected light amount of each region to the reflected light amount of the region, with the region illuminated most brightly by the main flashlight 10 (the maximum reflected light amount) as a reference.
First, assuming that the main subject is located closest to the camera, an area that returns the maximum value is set as a dimming target area, and the maximum reflected light amount b1max is obtained as follows.
[0020]
[Expression 2]

[0021]
When the maximum reflected light amount b1max is obtained, the dimming area is normalized with the maximum value, and the irradiation distributions I11 to I15 of each area of the main flashlight 10 are calculated as follows.
[0022]
[Equation 3]

[0023]
In S7, a guide number tgn1 which is a provisional shooting-time emission amount (provisional main emission amount) of the main flashlight 10 is calculated. Specifically, tgn1 of the main flashlight 10 is obtained by the following formula so that the light emission amount is appropriate for the light control target region determined previously.
[0024]
[Expression 4]

[0025]
In S <b> 8, photometry of the additional monitor light emission of the additional flashlight 20 is started.
In S9, the additional flash monitor 20 performs the additional monitor light emission (preliminary additional light emission). In the light emission monitor light emission, the light emission lamp tube 22 emits light with a guide number p2 having a predetermined small light emission amount.
In S10, photometry of the light increase monitor light emission is completed, and temporary photometric values (light increase preliminary photometric values) t21 to t25 of the five areas of the photometric sensor 5 are acquired.
In S11, the constant light components measured immediately before or immediately after the monitor light emission of the photometric sensor 5 additional flashlight 20 are a21 to a25, and the steady light components from the photometric values t21 to t25 as shown in the following formula 5. By subtracting a21 to a25, the reflected light amounts b21 to b25 of the five areas of the flashlight flashlight 20 in the pure flashlight monitor emission are obtained. Note that the interval between S3 that performs main monitor light emission and S9 that performs light increase monitor light emission is performed at an extremely short time interval, so that the stationary light components a21 to a25 are not newly measured, and are already measured. The calculation may be performed by regarding the light components a11 to a15 as the steady light components a21 to a25.
[0026]
[Equation 5]

[0027]
In S12, the irradiation distributions I21 to I25 of the additional flashlight 20 are calculated.
Here, as in the case of the main flashlight 10, the irradiation distributions I21 to I25 are assumed that the main subject exists in the place closest to the camera, and the area where the maximum value is returned is the dimming target area. The amount of reflected light b2max is obtained as follows.
[0028]
[Formula 6]

[0029]
When the maximum reflected light amount b2max is obtained, the dimming area is normalized with the maximum value, and the irradiation distributions I21 to I25 of each area of the flashlight flashlight 20 are calculated as follows.
[0030]
[Expression 7]

[0031]
In S13, a guide number tgn2 that is a provisional light emission amount at the time of photographing (a provisional light increase amount of light) is calculated. Specifically, tgn2 of the additional flashlight 20 is obtained by the following formula so that the light emission amount is appropriate for the previously determined dimming target region.
[0032]
[Equation 8]

[0033]
In S14, the main light emission amount is calculated. The calculation of the main light emission amount performed here is appropriate exposure even when the main flashlight 10 and the additional flashlight 20 overlap each other in the light control target areas (the areas illuminated by both flashlights overlap). In this way, the above-mentioned provisional guide number is calculated by calculating the amount of light reduction.
FIG. 4 is a flowchart showing a flow of operation of the main light emission amount calculation in the first embodiment.
In S21, the irradiation distributions of the main flashlight 10 and the additional flashlight 20 are summed in each region.
[0034]
[Equation 9]

[0035]
The values of Isum1 to Isum5 obtained in this way indicate the illuminance distribution when the main flashlight 10 and the additional flashlight 20 emit light during the main light emission with the guide numbers tgn1 and tgn2. If there is a region where the values of Isum1 to Isum5 are 1, it indicates that the exposure of the region is appropriate (the illumination amount of the main flashlight 10 and the additional flashlight 20 is an appropriate value). Overexposure is indicated, and if it is less than 1, underexposure is indicated.
In S22, the maximum value Imax in Isum1 to Isum5 and the area mpos for returning the maximum value are obtained.
[0036]
[Expression 10]

[0037]
In S23, it is determined whether or not the maximum value Imax exceeds 1. When the maximum value Imax exceeds 1, the process proceeds to S24, and when the maximum value Imax does not exceed 1, the process proceeds to S26.
In S24, the amount of light reduction (the ratio of light reduction) is determined so that the amount of light reduction increases as the contribution rate of the flashlight increases. Specifically, first, dn shown below is calculated from Imax obtained in S22.
[0038]
## EQU11 ##

[0039]
From this dn, the ratio of dimming the main flashlight 10 and the additional flashlight 20 is obtained. The ratio of light reduction is obtained in accordance with the ratio of the main flashlight 10 and the increased flashlight 20 to the area mpos where the sum is maximized (so that the flashlight with a higher contribution ratio increases the amount of light reduction). For example, if the area mpos is 51 in the center, the following is performed.
[0040]
[Expression 12]

[0041]
In S25, using Kdn1 and Kdn2, the provisional guide number tgn1 of the main flashlight 10 and the provisional guide number tgn2 of the additional flashlight 20 previously obtained are dimmed and used at the time of shooting (during main light emission). Guide numbers gn1 and gn2 of the main flashlight 10 and the additional flashlight 20 are obtained.
[0042]
[Formula 13]

[0043]
In S26, tgn1 and tgn2 are set as guide numbers gn1 and gn2 at the time of photographing.
Returning to FIG. 3, in S15, the shutter is opened.
In S16, the main flashlight 10 emits light with the guide number gn1, and the additional flashlight 20 emits light with the guide number gn2.
In S17, the shutter is closed and the multiple-flash photography is finished.
[0044]
Here, in the present embodiment, the ratio of light reduction according to the ratio of the main flashlight 10 and the additional flashlight 20 to the area mpos (so that the flashlight with a higher contribution ratio increases the amount of light reduction) The reason why the guide numbers gn1 and gn2 are obtained based on this ratio will be described.
FIG. 5 is a diagram showing an example of the photographing screen superimposed on the diagram showing the photometric area of the photographing screen shown in FIG.
The main flashlight 10 mainly illuminates the person 12, the increased flashlight 20 mainly illuminates the background 13, and each illumination light (flash) illuminates both the person 12 and the background 13. Assume a case.
[0045]
Here, it is assumed that the main flashlight 10 has a higher contribution rate to illuminate the person 12 as the main subject than the flashlight flashlight 20. At this time, in order to make the person 12 have proper exposure, among the provisional guide numbers tgn1 and tgn2 obtained previously, tgn2 of the additional flashlight 20 is greatly reduced or tgn1 and tgn2 are reduced by the same amount. Or tgn1 and tgn2 are dimmed at the same rate (by determining how to reduce the amount of light different from the present embodiment) and determining the guide number of the main light emission, Although the light quantity of the guide number of the increased flashlight 20 that illuminates the background 13 is large, the background 13 is underexposed.
[0046]
Therefore, in the present embodiment, the background 13 is mainly used as the light is dimmed according to the rate of contribution to the illumination of the person 12 (main subject) (so that the amount of light reduction increases as the contribution rate increases). The guide number of the additional flashlight 20 to be illuminated is set as large as possible so that the person 12 is properly exposed and the illumination light effect of the background 13 is sufficiently obtained.
[0047]
According to the present embodiment, in the multiple flash photography using a plurality of flashlights, the light emission amount is automatically determined with the optimum light quantity ratio regardless of the positional relationship of the flashlight, and excellent multiple flash photography. Can be easily taken.
[0048]
(Second Embodiment)
Since the second embodiment is an improved version of S14 (the operation for calculating the actual light emission amount) in the first embodiment, the same reference numerals are given to the portions that perform the same functions as the first embodiment, A duplicate description will be omitted as appropriate.
FIG. 6 is a flowchart showing the flow of the calculation operation of the main light emission amount in the second embodiment. In this flowchart, S31 to S36 perform the same operations as S21 to S26 in the first embodiment.
[0049]
In S37, it is determined whether or not there are a plurality of regions in which the values of the sums Isum1 to Isum5 of the irradiation distribution obtained in S31 exceed 1. If there are a plurality of areas exceeding 1, the process proceeds to S38, and if there is only one area, the process returns to S15 (FIG. 3).
A region where the values of Isum1 to Isum5 exceed 1 is a region that is overexposed unless dimming is performed. Therefore, in the first embodiment, when the maximum region exceeds 1, the light is dimmed so that proper exposure can be obtained in that region.
[0050]
However, if there are a plurality of regions where the values of Isum1 to Isum5 exceed 1, only the maximum region is set to an appropriate value (Imax is set to 1), and other regions do not necessarily exceed 1 (exposure). It is not necessarily over).
Therefore, in the present embodiment, when there are a plurality of regions in which the values of Isum1 to Isum5 exceed 1, the process proceeds to S38, and gn1 and gn2 obtained in S35 are assumed to be the temporary guide numbers tgn1 and tgn2 (tgn1 = Gn1, tgn2 = gn2), the operation from S31 is repeated again.
If this operation is repeated and there is no more than one region, it is possible to avoid the occurrence of an overexposed region.
[0051]
According to the present embodiment, when there are a plurality of regions where the values of Isum1 to Isum5 exceed 1, the operation for calculating the light emission amount is repeatedly performed, so that an overexposed region does not occur and a favorable photographing result is obtained. be able to.
[0052]
(Third embodiment)
Since the third embodiment is a form obtained by further improving the first embodiment, portions having the same functions as those of the first embodiment are denoted by the same reference numerals, and redundant description is appropriately omitted.
FIG. 7 is a flowchart showing the operation of the camera in the third embodiment. In this flowchart, S101 to S107, S111 to S116, and S120 to S123 perform the same operations as S1 to S7, S8 to S13, and S120 to S123 in the first embodiment, respectively. Only S108 to S110 and S117 to S119, which are different in operation, will be described.
[0053]
In S108, the maximum guide number gnmax1 which is the light emission capacity limit of the main flashlight 10 is compared with the calculated temporary guide number tgn1. If tgn1 is larger than gnmax1, the process proceeds to S109, and otherwise, the process proceeds to S111.
[0054]
In S109, the irradiation distributions I11 to I15 of the main flashlight 10 are corrected. The fact that the process has proceeded to this step means that the main flashlight 10 has insufficient ability to emit the calculated temporary guide number tgn1. Therefore, the correction of the irradiation distributions I11 to I15 performed here is specifically performed by performing the following calculation, and the irradiation distributions I11 to I15 are estimated to be small according to the degree of lack of the light emission capability.
[0055]
[Expression 14]

[0056]
By doing in this way, irradiation distribution I11-I15 of the main flashlight 10 becomes an appropriate value according to light emission capability.
In S110, gnmax1 is substituted for tgn1, and the provisional guide number is set as the maximum guide number that is the light emission capacity limit of the main flashlight 10.
Hereinafter, S111 to S116 perform the same operations as S8 to S13 in the first embodiment.
[0057]
In S117, the maximum guide number gnmax2 which is the light emission capacity limit of the additional flashlight 20 is compared with the calculated temporary guide number tgn2. If tgn2 is larger than gnmax2, the process proceeds to S118, and otherwise, the process proceeds to S120.
[0058]
In S118, the irradiation distributions I21 to I25 of the additional flashlight 20 are corrected. The fact that the process has proceeded to this step means that the increased flashlight 20 has insufficient ability to emit the calculated temporary guide number tgn2. Therefore, the correction of the irradiation distributions I21 to I25 performed here is specifically performed by the following calculation, and the irradiation distributions I21 to I25 are estimated to be small according to the degree of lack of the light emission capability.
[0059]
[Expression 15]

[0060]
By doing so, the irradiation distributions I21 to I25 of the additional flashlight 20 become appropriate values according to the light emission capability.
In S119, gnmax2 is substituted for tgn2, and the provisional guide number is set as the maximum guide number that is the light emission capability limit of the additional flashlight 20.
[0061]
According to this embodiment, the irradiation distribution is determined (corrected) according to the light emission capability of the flashlight. That is, since the exposure is determined based on the total of irradiation distributions that can actually be irradiated, not the total of the calculated irradiation distributions, at least one provisional guide number of the main flashlight 10 or the additional flashlight 20 is used. Even if the light emission capacity exceeds the light emission capacity, it is possible to obtain an appropriate light emission amount.
[0062]
(Deformation)
The present invention is not limited to the embodiment described above, and various modifications and changes are possible, and these are also within the equivalent scope of the present invention.
For example, in each embodiment, an example in which two flashlights of the main flashlight 10 and the additional flashlight 20 are used has been described. However, the present invention is not limited to this. For example, the number of additional flashlights can be further increased. Also good.
[0063]
【The invention's effect】
As described above in detail, according to the present invention, the following effects can be obtained.
(1) The provisional main light emission scheduled amount and the provisional additional light emission scheduled amount are combined to calculate the planned illumination amount for each of the divided photometry areas, and an appropriate value is obtained for the planned illumination amount to be the amount of light necessary for properly illuminating the subject. When there is an over area that exceeds, the estimated amount of lighting in the over area is appropriate by decreasing the planned amount of light emission to the higher side of the provisional main flash scheduled amount and the provisional additional light emission scheduled amount of light that illuminates the over region. Since the main flash emission scheduled amount of the main flash emission device and the increase flash main emission scheduled amount of the flash increase flash light emission device are calculated so as to be a value, In shooting using a flashlight, even if each flashlight is freely arranged, it is possible to automatically perform shooting with an optimal light amount ratio.
[0064]
(2) When there are a plurality of over-areas, the main light emission amount calculation means calculates the main main light emission scheduled amount and the additional lamp main light emission scheduled amount so that the region having the largest planned illumination amount has an appropriate value. The optimal light emission amount can be calculated easily without increasing the calculation load.
[0065]
(3) When there are a plurality of over-areas, the main light emission amount calculation means calculates the main main light emission scheduled amount and the additional lamp main light emission scheduled amount, and then calculates the calculated main main light emission scheduled amount and the additional main light emission scheduled The operation of calculating the main main flash scheduled amount and the additional main flash scheduled amount is repeatedly performed until the over region disappears, assuming that the amount is the provisional main flash scheduled amount and the provisional additional light emission scheduled amount. Can be completely prevented.
[0066]
(4) The provisional main light emission scheduled amount calculation means and / or the provisional increase lamp emission amount calculation means (6, S13) emit light of the main flash light emission device (10) and / or the increase flash light emission device (20). When the capacity is insufficient with respect to the provisional main light emission scheduled amount and / or the provisional light increase light emission scheduled amount, respectively, the main preliminary light measurement value and / or the light increase preliminary light measurement value according to the degree of the shortage. And the maximum flashable light quantity of the main flash light emitting device and / or the additional flash light emitting device is set as the provisional main light emission scheduled amount and / or provisional additional light emission scheduled amount, so the distance from the flashlight to the subject Even if the distance is too long or a small flashlight is used, underexposure can be avoided. Therefore, it is possible to easily perform shooting with proper exposure without worrying about the light emission capability of the flashlight, the distance from the flashlight to the subject, and the like.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of an embodiment of a camera according to the present invention.
FIG. 2 is a diagram showing a photometric area of a shooting screen using the photometric sensor 5;
FIG. 3 is a flowchart showing the operation of the camera in the present embodiment.
FIG. 4 is a flowchart showing a flow of operation of the main light emission amount calculation in the first embodiment.
FIG. 5 is a diagram showing an example of a photographing screen superimposed on a diagram showing a photometric area of the photographing screen shown in FIG. 2;
FIG. 6 is a flowchart showing a flow of a calculation operation of a main light emission amount in the second embodiment.
FIG. 7 is a flowchart showing a flow of a calculation operation of a main light emission amount in the third embodiment.
[Explanation of symbols]
1 Photo lens
2 Aperture
3 Distance detector
4 Quick return mirror
5 Photometric sensor
6 Control device
10 Main flashlight
11 Main arc tube controller
12 Main arc tube
20 Additional flashlight
21 Light-intensifying arc tube controller
22 Additional lamp arc tube

Claims

An apparatus for illuminating a subject, which is a main flash light emitting device that performs main preliminary light emission prior to the main light emission, and an apparatus for illuminating the subject from a position different from the main flash light emitting device, and increasing the number of lights prior to the main light emission. At least one additional flash light emitting device for performing preliminary light emission;
Is a camera that can control multiple flashlights,
A photometric means for outputting a photometric value for each divided photometric area obtained by dividing the object scene into a plurality of areas;
Temporary main light emission scheduled amount calculating means for calculating a provisional main light emission scheduled amount that is a provisional light emission amount of the main flash light emitting device based on the main preliminary light measurement value obtained by the photometry means during the main preliminary light emission;
Temporary increase light emission schedule for calculating a provisional increase light emission scheduled amount, which is a provisional emission amount of the flash increase flash light emitting device, based on the light increase preliminary photometric value obtained by the light metering means during the light increase preliminary emission A quantity calculation means;
The provisional main light emission scheduled amount and the provisional additional lamp light emission scheduled amount are combined to calculate the planned illumination amount for each of the divided photometry areas, and the appropriate illumination value is the appropriate light amount necessary for properly illuminating the subject. When there is an over region exceeding the provisional main light emission amount and the provisional light increase depending on the ratio of the main flash light emitting device and the additional flash light emitting device to the planned illumination amount corresponding to the over region based on the percentage of dimming the light emission predetermined amount, as lighting schedule of the over area becomes the appropriate value, the main main light emission a predetermined amount is present emitting a predetermined amount of the main flash light emission device, and the increase A main light emission amount calculating means for calculating a main light emission expected amount of light that is a main light emission scheduled amount of the lamp flashlight device;
With a camera.

The camera of claim 1,
The main light emission amount calculating means calculates the main main light emission scheduled amount and the increased main light emission scheduled amount so that the region with the largest planned illumination amount becomes the appropriate value when there are a plurality of over regions. To do,
Camera characterized by.

The camera according to claim 1 or 2,
The main light emission amount calculation means calculates the main main light emission scheduled amount and the additional lamp after calculating the main main light emission scheduled amount and the additional lamp main light emission scheduled amount when there are a plurality of over regions. Repeatedly performing the operation of calculating the main light emission scheduled amount and the light increase main light emission scheduled amount as the provisional main light emission scheduled amount and the provisional additional light emission scheduled amount until the over region disappears,
Camera characterized by.

In the camera according to any one of claims 1 to 3,
The provisional main light emission scheduled amount calculation means and / or the provisional increase lamp light emission amount calculation means have the light emission capability of the main flash light emission device and / or the increase flash light emission device, respectively. If there is a shortage with respect to the provisional light increase scheduled light emission amount, the main preliminary light measurement value and / or the additional light preliminary light measurement value are estimated to be small according to the shortage degree, and the light emission capability is insufficient. The maximum light emission possible amount of the main flash light emitting device and / or the additional flash light emitting device is set as the provisional main light emission scheduled amount and / or provisional increased lamp light emission scheduled amount,
Camera characterized by.

A main flash light emitting device that illuminates the subject and performs main preliminary light emission prior to the main light emission;
An apparatus for illuminating a subject from a position different from the main flash light emitting apparatus, and at least one additional flash light emitting apparatus that performs preliminary increase light emission prior to the main light emission;
A photometric means for outputting a photometric value for each divided photometric area obtained by dividing the object scene into a plurality of areas;
Temporary main light emission scheduled amount calculating means for calculating a provisional main light emission scheduled amount that is a provisional light emission amount of the main flash light emitting device based on the main preliminary light measurement value obtained by the photometry means during the main preliminary light emission;
Temporary increase light emission schedule for calculating a provisional increase light emission scheduled amount, which is a provisional emission amount of the flash increase flash light emitting device, based on the light increase preliminary photometric value obtained by the light metering means during the light increase preliminary emission A quantity calculation means;
The provisional main light emission scheduled amount and the provisional additional lamp light emission scheduled amount are combined to calculate the planned illumination amount for each of the divided photometry areas, and the appropriate illumination value is the appropriate light amount necessary for properly illuminating the subject. When there is an over region exceeding the provisional main light emission amount and the provisional additional light emission scheduled light amount, the higher the contribution ratio that illuminates the over region, the more the light emission planned amount is reduced, the more the light emission planned amount is reduced. The main light emission scheduled amount that is the main light emission scheduled amount of the main flash light emitting device, and the increased light main light emission scheduled that is the main light emission scheduled amount of the additional flash light emitting device so that the planned illumination amount becomes the appropriate value. A main light emission amount calculating means for calculating the amount;
Camera flashlight shooting system equipped with.

In the multiple-flash photography system of the camera according to claim 5,
The main light emission amount calculating means calculates the main main light emission scheduled amount and the increased main light emission scheduled amount so that the region with the largest planned illumination amount becomes the appropriate value when there are a plurality of over regions. To do,
This is a camera flashlight shooting system.

In the multiple-flash photographing system for a camera according to claim 5 or 6,
The main light emission amount calculation means calculates the main main light emission scheduled amount and the additional lamp after calculating the main main light emission scheduled amount and the additional lamp main light emission scheduled amount when there are a plurality of over regions. Repeatedly performing the operation of calculating the main light emission scheduled amount and the light increase main light emission scheduled amount as the provisional main light emission scheduled amount and the provisional additional light emission scheduled amount until the over region disappears,
This is a camera flashlight shooting system.

In the multiple-flash photography system of the camera according to any one of claims 5 to 7,
The provisional main light emission scheduled amount calculation means and / or the provisional increase lamp light emission amount calculation means have the light emission capability of the main flash light emission device and / or the increase flash light emission device, respectively. If there is a shortage with respect to the provisional light increase scheduled light emission amount, the main preliminary light measurement value and / or the additional light preliminary light measurement value are estimated to be small according to the shortage degree, and the light emission capability is insufficient. The maximum light emission possible amount of the main flash light emitting device and / or the additional flash light emitting device is set as the provisional main light emission scheduled amount and / or provisional increased lamp light emission scheduled amount,
This is a camera flashlight shooting system.