JP2004117399A

JP2004117399A - Camera

Info

Publication number: JP2004117399A
Application number: JP2002276367A
Authority: JP
Inventors: Yoshimi Ono; 大野　好美; Katsuhiko Funo; 布野　勝彦
Original assignee: Ricoh Co Ltd
Current assignee: Ricoh Co Ltd
Priority date: 2002-09-20
Filing date: 2002-09-20
Publication date: 2004-04-15
Anticipated expiration: 2022-09-20
Also published as: JP4188650B2

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the occurrence of flare or the like by reducing disturbing light caused by reflection in a lens barrel not only in the case of performing wide-angle photography but also in the case of performing telephotography. <P>SOLUTION: When a 1st disturbing light eliminating member 35 and a 2nd disturbing light eliminating member 36 are arranged in front of the incident surface of a variable power optical system 1 consisting of a plurality of lens groups and photography is performed by setting the optical system 1 in a telephoto state, the member 35 is rotated by 30° in a CCW direction, and also the member 36 is rotated by 30° in a CW direction so as to change the shape of an aperture in front of the incident surface and eliminate luminous flux disturbing to the telephotography. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、変倍光学系を持つカメラに係わり、特に広角撮影を行うときにも、また望遠撮影を行うときにも、フレアが発生しないようにしたカメラに関する。
【０００２】
【従来の技術】
カメラに取り付けられる変倍光学系として、従来、図１３に示すものが知られている。
この図に示す変倍光学系１００は、６枚のレンズ１０１〜１０６によって構成される６群６枚構成の光学系であり、図１４、図１５に示す如くレンズ１０１〜１０４からなる第１群レンズ１０７と、レンズ１０５と１０６からなる第２群レンズ１０８との間隔を変化させて、倍率を変更させることにより、広角撮影でも、望遠撮影でも行えるようになっている。
そして、このような変倍光学系１００では、広角撮影時、望遠時に、光軸に入射する光線束（中心光束）、３５ｍｍフィルムに対応するアパーチャサイズが２４×３６のとき、短辺（＝２４）に入射する光線束（短辺光束）、アパーチャサイズが２４×３６のとき、長辺（＝３６）に入射する光線束（長辺光束）、アパーチャサイズが２４×３６のとき、対角に入射する光線束（対角光束）など、撮影に必要な光束（以下、これらを必要光束と呼ぶ）の内側に、各レンズ１０１〜１０６を支持する部材、変倍させるための部材などが入らないように、これら各部材を配置しなければならない。
【０００３】
【発明が解決しようとする課題】
ところで、近年、各レンズ１０１〜１０６などを支持している鏡胴などを小型化させて、カメラ全体を小型化させることが多く、鏡胴の先端部分にフードなどを取り付けることが難しい。
このため、変倍光学系１００を望遠にさせて、太陽光などのような強烈な光源側にある被写体を撮影しているとき、これらの強烈な光がファインダ内に入らないようにしているときでも、太陽光がレンズ端面、鏡胴内壁などに反射して、その反射光がフィルムに到達し、フレアが発生してしまうという問題があった。
そこで、このような変倍光学系１００では、図１６に示す如く鏡胴１０９内部のうち、対角光束の外側となる各部分（フレア発生源部分１１０）に凹凸を付けさせるとともに、無反射塗料を塗布させて反射率を低減させることにより、反射光を拡散させる方法、図１７に示す如く望遠撮影時における短辺光束の外側に有害光カットシート１１１を配置させて有害光束をカットさせる方法などで、フレアの発生を防止させている。
しかしながら、これらの各フレア防止方法では、図１７に示す如く短辺光束については、鏡胴１０９内部への入射光、あるいは鏡胴１０９内部からの反射光を有効にカットさせることができるものの、図１６に示す如く望遠撮影時の対角光束については、端面部分１１２で、有害光束を完全に取り除くことが難しく、フレアを完全に防止させることができないという問題があった。
本発明は上記の事情に鑑み、請求項１では、倍率などが変更されたとき、倍率などに対応させて入射開口形状を変更させ、広角撮影を行うときにも、また望遠撮影を行うときにも、鏡胴内等の反射に起因する有害光を減少させて、フレアなどの発生を防止させることができるカメラを提供することを目的としている。
【０００４】
また、請求項２では、倍率などが変更されたとき、倍率などに対応させて入射開口形状を電気的に変更させ、機械的な機構部分を簡素化させながら、広角撮影を行うときにも、また望遠撮影を行うときにも、鏡胴内等の反射に起因する有害光を減少させて、フレアなどの発生を防止させることができるカメラを提供することを目的としている。
また、請求項３では、倍率などが変更されて、レリーズ操作されたとき、倍率などの変更内容に対応させて、入射開口形状を電気的に変更させ、機械的な機構部分を簡素化させながら、広角撮影を行うときにも、また望遠撮影を行うときにも、遅滞なく鏡胴内等の反射に起因する有害光を減少させて、フレアなどの発生を防止させることができるカメラを提供することを目的としている。
また、請求項４では、倍率などが変更されたとき、倍率などに対応させて、２枚の部材を相異なる方向へ回転させることにより、入射開口形状を変更させ、機械的な機構部分を簡素化させながら、広角撮影を行うときにも、また望遠撮影を行うときにも、鏡胴内等の反射に起因する有害光を減少させて、フレアなどの発生を防止させることができるカメラを提供することを目的としている。
また、請求項５では、倍率などが変更されたとき、倍率などに対応させて、焦点調節用レンズの駆動源と同じ駆動源の力で、入射開口形状を変更させ、部品点数を低減させるとともに、機械的な機構部分を簡素化させながら、広角撮影を行うときにも、また望遠撮影を行うときにも、鏡胴内等の反射に起因する有害光を減少させて、フレアなどの発生を防止させることができるカメラを提供することを目的としている。
また、請求項６では、解除用のアクチュエータ等を不要にさせながら、倍率などが変更されたとき、倍率などに対応させて、入射開口形状の変更、保持、解除を行わせ、機械的な機構部分を簡素化させながら、広角撮影を行うときにも、また望遠撮影を行うときにも、鏡胴内等の反射に起因する有害光を減少させて、フレアなどの発生を防止させることができるカメラを提供することを目的としている。
【０００５】
また、請求項７では、倍率などが変更されたとき、倍率が予め設定された倍率範囲内に入っているかどうかに基づき、有害光カット保持機構、有害光カット解除機構を動作させて、入射開口形状の変更、保持、解除を行わせ、機械的な機構部分を簡素化させながら、有害光カット解除操作などの特別な操作を行わせることなく、広角撮影を行うときにも、また望遠撮影を行うときにも、鏡胴内等の反射に起因する有害光を減少させて、フレアなどの発生を防止させることができるカメラを提供することを目的としている。
また、請求項８では、倍率などが変更されたとき、倍率などに対応させて、簡単な制御手順で、焦点調節用レンズの駆動源を動作させて、入射開口形状を変更させ、広角撮影を行うときにも、また望遠撮影を行うときにも、鏡胴内等の反射に起因する有害光を減少させて、フレアなどの発生を防止させることができるカメラを提供することを目的としている。
また、請求項９では、倍率などが変更されたとき、倍率などに対応させて、入射開口形状を変更させ、広角撮影を行うときにも、また望遠撮影を行うときにも、鏡胴内等の反射に起因する有害光を減少させて、フレアなどの発生を防止させることができるとともに、入射開口形状を変更させるとき、何らかの異常が発生しても、正常な状態に復帰させることができるカメラを提供することを目的としている。
また、請求項１０では、倍率などが変更されたとき、倍率などに対応させて、入射開口形状を変更させ、広角撮影を行うときにも、また望遠撮影を行うときにも、鏡胴内等の反射に起因する有害光を減少させて、フレアなどの発生を防止させることができるとともに、入射開口形状を変更させるとき、何らかの異常が発生しても、簡単な制御手順で、正常な状態に復帰させることができるカメラを提供することを目的としている。
【０００６】
また、請求項１１では、撮影開始が指示されたとき、簡単な制御手順で、光学系などの各部を連続的に動作させながら、倍率などに対応させて、入射開口形状を変更させ、広角撮影を行うときにも、また望遠撮影を行うときにも、鏡胴内等の反射に起因する有害光を減少させて、フレアなどの発生を防止させるカメラを提供することを目的としている。
また、請求項１２では、倍率などが変更されたとき、倍率などに対応させて、請求項８の制御手順と異なる簡単な制御手順で、焦点調節用レンズの駆動源を動作させて、入射開口形状を変更させ、広角撮影を行うときにも、また望遠撮影を行うときにも、鏡胴内等の反射に起因する有害光を減少させて、フレアなどの発生を防止させることができるカメラを提供することを目的としている。
また、請求項１３では、電源投入時などに、光学系を初期状態にセットさせた後、倍率などが変更されたとき、倍率などに対応させて、入射開口を変更させ、広角撮影を行うときにも、また望遠撮影を行うときにも、鏡胴内等の反射に起因する有害光を減少させて、フレアなどの発生を防止させるカメラを提供することを目的としている。
また、請求項１４では、電源投入時などに、簡単な制御手順で、光学系を初期状態にセットさせた後、倍率などが変更されたとき、倍率などに対応させて、入射開口を変更させ、広角撮影を行うときにも、また望遠撮影を行うときにも、鏡胴内等の反射に起因する有害光を減少させて、フレアなどの発生を防止させるカメラを提供することを目的としている。
また、請求項１５では、撮影開始が指示されたとき、簡単な制御手順で、光学系などの各部を連続的に動作させながら、倍率などに対応させて、入射開口形状を変更させ、広角撮影を行うときにも、また望遠撮影を行うときにも、鏡胴内等の反射に起因する有害光を減少させて、フレアなどの発生を防止させるカメラを提供することを目的としている。
【０００７】
【課題を解決するための手段】
上記の目的を達成するために本発明は、請求項１のカメラでは、複数のレンズ群からなる変倍光学系と、変倍光学系への入射面の前に配置され、変倍に伴い開口形状を変化させる有害光カット手段とを備えたことを特徴としている。
また、請求項２では、請求項１に記載のカメラにおいて、前記変倍光学系を光軸に沿って変位させる事により、変倍動作させる変倍動作駆動部材と、変倍動作駆動部材の変倍動作に伴い変位する量を検出する変倍量検出手段と、前記有害光カット手段を電気的に駆動する有害光カット駆動手段と、前記変倍量検出手段からの出力に基づき前記有害光カット駆動手段の有害光カット量を制御する光学系制御手段とを備えたことを特徴としている。
また、請求項３では、請求項２に記載のカメラにおいて、カメラ制御手段とカメラの撮影開始を指示するレリーズ手段を持ち、このレリーズ手段により、撮影開始が指示されたとき、カメラ制御手段からの出力に基づき、前記光学系制御手段を動作させて、前記変倍量検出手段の出力を読み取らせ、この出力と、予め設定された関係とに基づき、前記有害光カット駆動手段の変位量を制御させることを特徴としている。
また、請求項４では、請求項３に記載のカメラにおいて、前記有害光カット手段は、広角時の開口形状を持つ２枚の有害光カット部材からなり、これら各有害光カット部材の相異なる方向へ回転させて、望遠時に発生する有害光をカットさせるようにしたことを特徴としている。
また、請求項５では、請求項４に記載のカメラにおいて、前記有害光カット駆動手段は、駆動モータと有害光カット駆動伝達手段からなり、前記駆動モータは前記有害光カット手段の駆動と前記変倍光学系内の焦点調節用レンズの駆動との両方の駆動源となっていることを特徴としている。
【０００８】
また、請求項６では、請求項５に記載のカメラにおいて、前記有害光カット手段として、前記有害光カット駆動伝達手段の移動量が、予め設定された領域Ａに属するとき、前記有害光カット駆動伝達手段によって移動した位置を保持する有害光カット保持手段と、前記領域Ａとは別の予め設定された領域Ｂに属するとき、前記有害光カット保持手段による保持を解除する有害光カット解除手段とを含むことを特徴としている。
また、請求項７では、請求項６に記載のカメラにおいて、前記有害光カット保持手段と前記有害光カット解除手段は、設定された角度範囲の円周上に爪部が設けられた回転自在なリングと、このリングを一回転方向に引張るリングスプリングと、このリングスプリングによって一方向に回転付勢されている前記リングの回転を阻止する回転自在な係止爪と、この係止爪を前記爪部方向に向ける係止爪スプリングとを備え、前記リングが設定角度範囲内にあるとき、前記係止爪によって、前記リングの回転を阻止させ、前記リングが前記設定角度範囲以上に回転したとき、前記係止爪による回転阻止を解除させることを特徴としている。
また、請求項８では、請求項６に記載のカメラにおいて、前記焦点調節用レンズを作動させる焦点調節用レンズ駆動手段を持ち、前記光学系制御手段によって、駆動モータが駆動されて、初期位置（レリーズ手段により撮影開始が指示される前の状態）から、予め設定された回転方向（例えば、ＣＷ）に回転させられているとき、前記有害光カット駆動伝達手段が前記領域Ａに入り、この後前記駆動モータが同一方向に回転駆動されたとき、前記有害光カット駆動伝達手段が前記領域Ｂに入り、また、光学系制御手段によって、前記駆動モータが駆動されて、初期位置から、前記回転方向と逆方向（例えば、ＣＣＷ）に回転されているとき、前記焦点調節用レンズ駆動手段によって、前記焦点調節用レンズの移動が開始されて、初期位置から所定移動量だけ移動させられ、この後前記駆動モータが前述とは逆方向（ＣＷ）に回転駆動されたとき、焦点調節用レンズが初期位置方向に移動することを特徴としている。
また、請求項９では、請求項７に記載のカメラにおいて、前記カメラの電源投入時／電源ＯＮ時に、前記光学系制御手段に指示を出して、前記駆動モータを初期リセットさせる初期リセット動作指示手段を持つことを特徴としている。
【０００９】
また、請求項１０では、請求項９に記載のカメラにおいて、前記領域Ｂ内に前記駆動モータの回転を阻止する駆動モータストップ部材を持ち、前記初期リセット動作指示手段による初期リセット動作として、前記駆動モータの初期位置から領域Ｂ内の駆動モータストップ部材まで到る量だけ、前記駆動モータを予め設定された回転方向（ＣＷ）に回転させた後、前記駆動モータを予め設定された回転方向（ＣＣＷ）に、予め設定された量だけ、回転させるという動作を行わせることを特徴としている。
また、請求項１１では、請求項８に記載のカメラにおいて、前記レリーズ手段により撮影開始が指示されたとき、前記カメラ制御手段は、前記光学系制御手段に指示を出して、前記変倍量検出手段の出力を読み取らせ、この出力と予め設定された関係とに基づき、前記領域Ａ内の初期位置に対する、前記有害光カット駆動手段の変位量／駆動モータの累積回転数を算出させ、前記カメラの測距手段から算出された値と前記変位量／駆動モータの累積回転数と予め設定された関係とに基づき、前記駆動モータの焦点調節用累積回転数を算出させ、前記カメラの測距手段から算出された値と初期位置から前記領域Ｂに至るまでの値と予め設定された関係とに基づき、解除累積回転数を算出させ、前記光学系制御手段から前記駆動モータに予め設定された回転方向（ＣＷ）と前記変位量／駆動モータの累積回転数とを指示させ、前記駆動モータが停止した後、前記光学系制御手段から前記駆動モータに前記回転方向とは逆になる回転方向（ＣＣＷ）と前記焦点調節用累積回転数とを指示させ、シャッタ動作等カメラの撮影動作完了後、前記光学系制御手段から前記駆動モータに予め設定された回転方向（ＣＷ）と前記解除累積回転数とを指示させ、前記駆動モータが停止した後、前記光学系制御手段から前記駆動モータに回転方向（ＣＣＷ）と、前記領域Ｂから初期位置までの前記累積回転数を指示させることを特徴としている。
また、請求項１２では、請求項６に記載のカメラにおいて、前記焦点調節用レンズを作動させる焦点調節用レンズ駆動手段を持ち、前記駆動モータが初期位置（レリーズ手段により撮影開始が指示される前の状態）にあるとき、前記有害光カット駆動伝達手段が前記領域Ｂにあり、前記光学系制御手段によって、前記駆動モータを駆動されて、予め設定された回転方向（ＣＣＷ）に回転させられているとき、前記有害光カット駆動伝達手段が前記領域Ａに入り、この後前記駆動モータが同一方向に回転駆動されたとき、前記焦点調節用レンズ駆動手段によって、前記焦点調節用レンズが初期位置から移動させられ、所定量だけ移動させられた後、前記駆動モータが前述とは逆方向（ＣＷ）に回転させられたとき、焦点調節用レンズが初期位置方向に移動することを特徴としている。
【００１０】
また、請求項１３では、請求項１２に記載のカメラにおいて、前記カメラの電源投入時／電源ＯＮ時に、前記光学系制御手段に指示を出して、前記駆動モータを初期リセットさせる初期リセット動作指示手段を持つことを特徴としている。また、請求項１４では、請求項１３に記載のカメラにおいて、前記領域Ｂ内に前記駆動モータの回転を阻止する駆動モータストップ部材を持ち、前記初期リセット動作指示手段による初期リセット動作として、前記駆動モータの初期位置から領域Ｂ内の駆動モータストップ部材まで到る量だけ、前記駆動モータを予め設定された回転方向（ＣＷ）に回転させるという動作を行わせることを特徴としている。
また、請求項１５では、請求項１２に記載のカメラにおいて、前記レリーズ手段により撮影開始が指示されたとき、前記カメラ制御手段は、前記光学系制御手段に指示を出して、前記変倍量検出手段の出力を読み取らせ、この出力と予め設定された関係とに基づき、前記領域Ａ内の設定位置に対する前記有害光カット駆動手段の変位量／駆動モータの累積回転数を算出させ、前記カメラの測距手段から算出された値と前記変位量／駆動モータの累積回転数と予め設定された関係とに基づき、前記駆動モータの焦点調節用累積回転数を算出させ、前記カメラの測距手段から算出された値と初期位置から前記領域Ｂに至るまでの値と予め設定された関係とに基づき、解除累積回転数を算出させ、前記光学系制御手段から前記駆動モータに予め設定された回転方向（ＣＣＷ）を指示させるとともに、前記領域Ｂと前記焦点調節用レンズを作動させる領域との間に設定された累積回転数を指示させ、前記駆動モータが停止した後、前記光学系制御手段から前記駆動モータに予め設定された回転方向（ＣＷ）と前記変位量／駆動モータの累積回転数を指示させ、前記駆動モータが停止した後、前記光学系制御手段から前記駆動モータに前記回転方向とは逆の回転方向（ＣＣＷ）と前記焦点調節用累積回転数を指示させ、シャッタ動作等カメラの撮影動作完了後、前記光学系制御手段から前記駆動モータに回転方向（ＣＷ）と、前記解除累積回転数とを指示させることを特徴としている。
【００１１】
【発明の実施の形態】
図１、図２は本発明によるカメラの一形態の効果を示す模式図であり、図１には、図１７に示すＡ位置（入射面）における、広角撮影時の必要光束範囲３と、望遠撮影時の必要光束範囲４と、望遠撮影時における有害光カット範囲（斜線部分）２とが示され、図２には図１７のＡ位置における、広角撮影時の必要光束範囲３と、望遠撮影時の必要光束範囲４と、広角撮影時の必要光束の範囲３を時計方向（ＣＷ）、反時計方向（ＣＣＷ）に各々、３０°回転させたものが示されている。
これらのことから明らかなように、広角撮影時の必要光束範囲３から、広角撮影時の必要光束範囲３をＣＷ方向に３０°回転させた範囲と、広角撮影時の必要光束範囲３をＣＣＷに３０°回転させた範囲とを取り除くと、望遠撮影時の対角方向にある有害光をカットすることができる。
以上、説明したように、変倍光学系１の入射面前に、変倍に伴い開口を変化させる有害光カット手段を配置させることにより、望遠撮影時において、主に鏡胴内面で発生するフレアを防止させることができる。
【００１２】
図３は本発明によるカメラの制御構成例を示すブロック図である。
図中の変倍光学系１とは、レンズ６〜９によって構成される第１群レンズ１０と、レンズ１１、１２によって構成される第２レンズ群１３とによって構成される光学系のことをいう。
また、変倍動作駆動部材１４とは、変倍用モータ、ギヤ等の伝達系、および鏡胴などで構成されており、変倍用モータが駆動されたとき、変倍光学系１の光軸方向に沿って、第２レンズ群１３の位置を変化させる部材のことをいう。
また、変倍量検出手段１５とは、上記変倍用モータにより変化した第２レンズ群１３の位置を検出する手段であり、ポテンショメータ、エンコーダ等が使用される。
また、光学系制御手段１６は、上記変倍量検出手段１５からの出力（変倍位置情報）を読み取り、この値と、予め設定された関係量とに基づき、駆動電圧などを発生する手段であり、カメラ等ではカメラ内のＣＰＵ（マイクロコンピュータ）、アクチュエータを駆動制御するＤＲＩＣ（ドライブＩＣ）等から構成される。
また、有害光カット駆動手段１７は、駆動源であるアクチュエータと、その力を伝達する伝達系とから構成されており、駆動源としては、ＤＣモータ、パルスモータが使用される。
また、有害光カット手段１８は変倍光学系１の入射面前に配置された複数の羽根（図８に示す第１有害光カット部材３５、第２有害光カット部材３６）によって構成されている。
【００１３】
図４〜図８（ｃ）は各々、本発明によるカメラで使用される合焦駆動機構１９、有害光カット駆動手段１８部分の機構図である。
図４には、合焦駆動機構１９を構成する各部材のうち、駆動源となるモータ２０と、ギヤ等による減速系２１から駆動リング２２までの構成図とが示されている。ここでは、モータ２０がＣＷ方向に回転した時、駆動リング２２がＣＣＷ方向に回転するものとし、この状態（駆動リング２２上の駆動ピン２３が図の状態）にあるときを初期位置とする。
また、図５は本発明によるカメラで使用される変倍光学系１、合焦駆動機構１９部分の断面図である。
図５中の第１群レンズ１０を構成するフォーカス用レンズ群２４は、フォーカス用のレンズ６、７などと、これらレンズ６、７などを支持するセルからなり、フォーカス用レンズ群案内部材２５により回転を阻止され、光軸方向への直進自在となっている。さらにフォーカス用レンズ群２４の外周にはヘリコイド２６がきられており、フォーカス駆動リング２７の回転により、フォーカス用レンズ群２４が光軸方向に直進する。
また、カメラとしては、図示していない自動合焦装置（ＡＦ）により、被写体までの距離を検出して、フォーカス用レンズ群２４の移動量を算出し、フォーカス用レンズ群２４を移動させ、その後シャッタを切り、シャッタが閉じた後、フォーカス用レンズ群２４を元の位置（初期位置）に戻すようになっている。
【００１４】
また、図６（ａ）、（ｂ）は各々、合焦駆動機構１９の動作例を示す図であり、図６（ａ）は初期位置を示し、図６（ｂ）は焦点合わせ時を示している。
また、図６（ａ）、（ｂ）中の駆動ピン２３は、駆動リング２２上の駆動ピンである。フォーカス駆動リング２７は、フォーカス駆動リングスプリング２８により、ＣＣＷ方向に付勢されており、フォーカス用レンズ群案内部材２５上のストッパ２９により回転を阻止されている。
また、モータ２０がＣＣＷ、駆動リング２２がＣＷ方向に回転すると、駆動ピン２３によりフォーカス駆動リングスプリング２８に抗してフォーカス駆動リング２７がＣＷ方向に回転する。また、フォーカス駆動リング２７の内周面には、ヘリコイド（メス）２６がきられており、フォーカス用レンズ群案内部材２５により回転案内されている。
図６（ｂ）は、前述のフォーカス用レンズ群２４を移動させ、その後シャッタを切っている状態である。
【００１５】
また、図７（ａ）、（ｂ）、（ｃ）は各々、有害光カット駆動手段１７を示し、図７（ａ）は初期位置を示し、また図７（ｂ）は有害光カット手段１７が保持されている状態を示し、また図７（ｃ）は有害光カット手段１７の保持が解除された状態を示している。
図７（ａ）中の駆動ピン２３は駆動リング２２上の駆動ピンである。ギヤ３７が形成されたリング３０はリングスプリング３１により、ＣＷ方向に付勢されており、フォーカス用レンズ群案内部材２５上のストッパ２９により回転が阻止されている。図示したように、リング３０の外周外には、リング３０の外周部に形成された爪部３２と係合するように、係止爪３３が配置されており、係止爪３３には係止爪スプリング３４が掛けられている。
また、係止爪３３は、係止爪スプリング３４により自由状態時に、係止爪３３の爪部が略光軸方向に向くようになっている。モータ２０がＣＷ方向、すなわちフォーカス用レンズ群２４に合焦動作を行わせる方向と逆の方向に回転して、駆動リング２２がＣＣＷ方向に回転すると、駆動ピン２３により、リング３０がリングスプリング３１に抗してＣＣＷ方向に回転する。
そして、リング３０が所定量回転すると、係止爪３３とリング３０の爪部３２の働きにより、図７（ｂ）のような状態（有害光カット手段保持状態）となり、駆動ピン２３がＣＷ方向に回転しても、リング３０が有害光カット手段保持状態に保持される。
この後、図７（ｂ）より、さらに駆動リング２２が回転すると、図７（ｃ）に示した状態となり、有害光カット手段保持状態が解除され、駆動ピン２３がＣＷ方向に回転したとき、リングスプリング３１により、リング３０がＣＷ方向に回転する。
なお、本発明では、係止爪３３と、リング３０の爪部３２との働きにより、図７（ｂ）のような状態（有害光カット手段保持状態）となり、駆動ピン２３がＣＷ方向に回転しても、リング３０が有害光をカットしている状態に保持される領域を領域Ａと呼び、また図７（ｂ）よりさらに駆動リング２２が回転させられて、図７（ｃ）に示した状態となり、有害光カット手段保持の状態が解除される領域を領域Ｂと呼んでいる。
【００１６】
図８（ａ）〜図８（ｃ）は各々、有害光カット手段１８を示し、図８（ａ）は初期位置を示し、また図８（ｂ）は中央部分に広角撮影時の必要光束範囲３に対応する開口が形成された、１枚目の有害光カット部材（第１有害光カット部材）３５がＣＣＷ方向に３０°回転した状態を示し、また図８（ｃ）は中央部分に広角撮影時の必要光束範囲３に対応する開口が形成された、２枚目の有害光カット部材（第２有害光カット部材）３６がＣＷ方向に３０°回転した状態を示している。
また、第１有害光カット部材３５、第２有害光カット部材３６には、図示したように外周に各々、ギヤ３８、３９がきられており、図８（ｂ）に示すように、リング３０がＣＣＷ方向に回転し、リング３０の外周に形成されているギヤ３７によって、第１連結ギヤ４０がＣＷ方向に回転させられたとき、第１連結ギヤ４０と噛合しているギヤ３８がＣＣＷ方向に回転させられて、第１有害光カット部材３５がＣＣＷ方向に回転させられ、図１に示す４つの有害光カット範囲２のうち、対角関係にある２つの有害光カット範囲２を実現する。
また、このとき、図８（ｃ）に示すように、リング３０の外周に形成されているギヤ３７によって、第２連結ギヤ４１がＣＷ方向に回転させられ、この第２連結ギヤ４１に噛合させられている第３連結ギヤ４２がＣＣＷ方向に回転させられる。これにより、第３連結ギヤ４２と噛合しているギヤ３９がＣＷ方向に回転させられて、第２有害光カット部材３６がＣＷ方向に回転させられ、図１に示す４つの有害光カット範囲２のうち、対角関係にある、残り２つの有害光カット範囲２を実現する。
【００１７】
図９は、初期位置として、図７（ａ）、図８（ａ）に示す位置を採用したときのシーケンス図である。
この図に示す如く、まずカメラのシーケンスのスタートは、図示していないレリーズ手段で始まり、測光、ＡＦ等の一連のシーケンス後、図中の下のスタート位置に来る。ここから図の左方にシーケンスが進み（駆動リング２２がＣＣＷ方向に回転）、変倍量検出手段１５からの出力（変倍位置情報）を読み取り、この値をもとに、変倍光学系１が望遠撮影状態にされているとき、有害光カット駆動手段１７を駆動制御し、駆動リング２２を領域Ａ内で停止させる。
この後、図の右方にシーケンスが進み（リング３０は保持状態で駆動リング２２がＣＷ方向に回転）、フォーカス駆動リング２７をＣＷ方向に回転させ、フォーカス用レンズ群２４を図示していない自動合焦装置（ＡＦ）により求まった位置で停止させる。
この状態でシャッタを開閉させ、その後図の左方にシーケンスが進みフォーカス用レンズ群２４を元の位置（初期位置）に戻すようになっている。
さらに、シーケンスは左方に進み、領域Ｂまで進む。ここで、リング３０の保持状態を解除する。その後、図の右方にシーケンスが進み（駆動リング２２がＣＷ方向に回転）、初期位置で停止する。
【００１８】
図１０は、図９に示すシーケンスに対する、リセットシーケンス図である。図９のシーケンスの途中で電源等がなくなった場合等異常が発生した場合のリセット方法である。
一般に、フォーカス用レンズ群２４を目標位置に停止させるために、駆動源として使用されるモータなどとして、パルスモータを使用するか、ＤＣモータを使用して、フォトインタラプタ等で回転数を読み取る方法が採られている。このような場合、固定系に対して絶対位置情報がないために、途中で停止した場合、その検出方法がない。そこで、このようなリセットシーケンスが必要となる。
また、初期位置として、図７（ｃ）に示す有害光カット手段保持解除位置を採用したときには、図９に示すシーケンス図に代えて、図１１に示すシーケンス図を使用する。
この図に示す如く、まずカメラのシーケンスのスタートは図示していないレリーズ手段で始まり、測光、ＡＦ等の一連のシーケンス後、図中の下のスタート位置に来る。ここから図の右方にシーケンスが進み（駆動リング２２がＣＷ方向に回転）、図中の広角撮影とｎｅａｒの間の設定された位置で停止する。その後、図の左方にシーケンスが進み（駆動リング２２がＣＣＷ方向に回転）、変倍量検出手段１５からの出力（変倍位置情報）を読み取り、この値をもとに、変倍光学系１が望遠撮影状態にされているとき、有害光カット駆動手段１７を駆動制御し、駆動リング２２を領域Ａ内で停止させる。
この後、図の右方にシーケンスが進み（リング３０は保持状態で駆動リング２２がＣＷ方向に回転）、フォーカス駆動リング２７をＣＷ方向に回転させ、フォーカス用レンズ群２４を図示していない自動合焦装置（ＡＦ）により求まった位置で停止させる。
この状態で、シャッタを開閉させ、その後図の左方にシーケンスが進み、フォーカス用レンズ群２４を元の位置（初期位置）に戻すようになっている。
さらに、シーケンスは左方に進み、領域Ｂ内に設けられた初期位置で停止する。
図１２は、図１１に示すシーケンスに対する、リセットシーケンス図である。図１１のシーケンスの途中で電源等がなくなった場合等異常が発生した場合のリセット方法である。
言うまでもないが、図９〜図１２のフォーカシングはｎｅａｒ、ｉｎｆ位置は逆でもよい。
【００１９】
【発明の効果】
以上説明したように本発明によれば、請求項１のカメラでは、倍率などが変更されたとき、倍率などに対応させて入射開口形状を変更させ、広角撮影を行うときにも、また望遠撮影を行うときにも、鏡胴内等の反射に起因する有害光を減少させて、フレアなどの発生を防止させることができる。
また、請求項２のカメラでは、倍率などが変更されたとき、倍率などに対応させて入射開口形状を電気的に変更させ、機械的な機構部分を簡素化させながら、広角撮影を行うときにも、また望遠撮影を行うときにも、鏡胴内等の反射に起因する有害光を減少させて、フレアなどの発生を防止させることができる。
また、請求項３のカメラでは、倍率などが変更されて、レリーズ操作されたとき、倍率などの変更内容に対応させて、入射開口形状を電気的に変更させ、機械的な機構部分を簡素化させながら、広角撮影を行うときにも、また望遠撮影を行うときにも、遅滞なく鏡胴内等の反射に起因する有害光を減少させて、フレアなどの発生を防止させることができる。
また、請求項４のカメラでは、倍率などが変更されたとき、倍率などに対応させて、２枚の部材を相異なる方向へ回転させることにより、入射開口形状を変更させ、機械的な機構部分を簡素化させながら、広角撮影を行うときにも、また望遠撮影を行うときにも、鏡胴内等の反射に起因する有害光を減少させて、フレアなどの発生を防止させることができる。
また、請求項５のカメラでは、倍率などが変更されたとき、倍率などに対応させて、焦点調節用レンズの駆動源と同じ駆動源の力で、入射開口形状を変更させ、部品点数を低減させるとともに、機械的な機構部分を簡素化させながら、広角撮影を行うときにも、また望遠撮影を行うときにも、鏡胴内等の反射に起因する有害光を減少させて、フレアなどの発生を防止させることができる。
また、請求項６のカメラでは、解除用のアクチュエータ等を不要にさせながら、倍率などが変更されたとき、倍率などに対応させて、入射開口形状の変更、保持、解除を行わせ、機械的な機構部分を簡素化させながら、広角撮影を行うときにも、また望遠撮影を行うときにも、鏡胴内等の反射に起因する有害光を減少させて、フレアなどの発生を防止させることができる。
【００２０】
また、請求項７のカメラでは、倍率などが変更されたとき、倍率が予め設定された倍率範囲内に入っているかどうかに基づき、有害光カット保持機構、有害光カット解除機構を動作させて、入射開口形状の変更、保持、解除を行わせ、機械的な機構部分を簡素化させながら、有害光カット解除操作などの特別な操作を行わせることなく、広角撮影を行うときにも、また望遠撮影を行うときにも、鏡胴内等の反射に起因する有害光を減少させて、フレアなどの発生を防止させることができる。
また、請求項８のカメラでは、倍率などが変更されたとき、倍率などに対応させて、簡単な制御手順で、焦点調節用レンズの駆動源を動作させて、入射開口形状を変更させ、広角撮影を行うときにも、また望遠撮影を行うときにも、鏡胴内等の反射に起因する有害光を減少させて、フレアなどの発生を防止させることができる。
また、請求項９のカメラでは、倍率などが変更されたとき、倍率などに対応させて、入射開口形状を変更させ、広角撮影を行うときにも、また望遠撮影を行うときにも、鏡胴内等の反射に起因する有害光を減少させて、フレアなどの発生を防止させることができるとともに、入射開口形状を変更させるとき、何らかの異常が発生しても、正常な状態に復帰させることができる。
また、請求項１０のカメラでは、倍率などが変更されたとき、倍率などに対応させて、入射開口形状を変更させ、広角撮影を行うときにも、また望遠撮影を行うときにも、鏡胴内等の反射に起因する有害光を減少させて、フレアなどの発生を防止させることができるとともに、入射開口形状を変更させるとき、何らかの異常が発生しても、簡単な制御手順で、正常な状態に復帰させることができる。また、請求項１１のカメラでは、撮影開始が指示されたとき、簡単な制御手順で、光学系などの各部を連続的に動作させながら、倍率などに対応させて、入射開口形状を変更させ、広角撮影を行うときにも、また望遠撮影を行うときにも、鏡胴内等の反射に起因する有害光を減少させて、フレアなどの発生を防止させる。
【００２１】
また、請求項１２のカメラでは、倍率などが変更されたとき、倍率などに対応させて、請求項８の制御手順と異なる簡単な制御手順で、焦点調節用レンズの駆動源を動作させて、入射開口形状を変更させ、広角撮影を行うときにも、また望遠撮影を行うときにも、鏡胴内等の反射に起因する有害光を減少させて、フレアなどの発生を防止させることができる。
また、請求項１３のカメラでは、電源投入時などに、光学系を初期状態にセットさせた後、倍率などが変更されたとき、倍率などに対応させて、入射開口を変更させ、広角撮影を行うときにも、また望遠撮影を行うときにも、鏡胴内等の反射に起因する有害光を減少させて、フレアなどの発生を防止させる。
また、請求項１４のカメラでは、電源投入時などに、簡単な制御手順で、光学系を初期状態にセットさせた後、倍率などが変更されたとき、倍率などに対応させて、入射開口を変更させ、広角撮影を行うときにも、また望遠撮影を行うときにも、鏡胴内等の反射に起因する有害光を減少させて、フレアなどの発生を防止させる。
また、請求項１５のカメラでは、撮影開始が指示されたとき、簡単な制御手順で、光学系などの各部を連続的に動作させながら、倍率などに対応させて、入射開口形状を変更させ、広角撮影を行うときにも、また望遠撮影を行うときにも、鏡胴内等の反射に起因する有害光を減少させて、フレアなどの発生を防止させる。
【図面の簡単な説明】
【図１】本発明によるカメラの一形態の効果を示す模式図である。
【図２】本発明によるカメラの一形態の効果を示す模式図である。
【図３】本発明によるカメラの制御構成例を示すブロック図である。
【図４】本発明によるカメラで使用される合焦駆動機構、有害光カット駆動手段部分の機構図である。
【図５】本発明によるカメラで使用される変倍光学系、合焦駆動機構部分の断面図である。
【図６】本発明によるカメラで使用される合焦駆動機構の動作例を示す模式図である。
【図７】本発明によるカメラで使用される有害光カット駆動手段の動作例を示す模式図である。
【図８】本発明によるカメラで使用される有害光カット手段の動作例を示す模式図である。
【図９】本発明によるカメラで使用されるシーケンス例を示す図である。
【図１０】図９に示すシーケンスに対するリセットシーケンスを示す図である。
【図１１】本発明によるカメラで使用される他のシーケンス例を示す図である。
【図１２】図１１に示すシーケンスに対するリセットシーケンスを示す図である。
【図１３】一般的に変倍光学系の一例を示す概略構成図である。
【図１４】図１３に示す変倍光学系の各光束例を示す模式図である。
【図１５】図１３に示す変倍光学系の各光束例を示す模式図である。
【図１６】図１３に示す変倍光学係を使用したカメラで採用されるフレア防止方法の一例を示す要部断面図である。
【図１７】図１３に示す変倍光学係を使用したカメラで採用されるフレア防止方法の他の一例を示す要部断面図である。
【符号の説明】
１：変倍光学系、２：望遠撮影時における有害光カット範囲、３：広角撮影時の必要光束範囲、４：望遠撮影時の必要光束範囲、６：レンズ、７：レンズ、８：レンズ、９：レンズ、１０：第１群レンズ、１１：レンズ、１２：レンズ、１３：第２レンズ群、１４：変倍動作駆動部材、１５：変倍量検出手段、１６：光学系制御手段、１７：有害光カット駆動手段、１８：有害光カット手段、１９：合焦駆動機構、２０：モータ、２１：減速系、２２：駆動リング、２３：駆動ピン、２４：フォーカス用レンズ群、２５：フォーカス用レンズ群案内部材、２６：ヘリコイド、２７：フォーカス駆動リング、２８：フォーカス駆動リングスプリング、２９：ストッパ、３０：リング、３１：リングスプリング、３２：爪部、３３：係止爪、３４：係止爪スプリング、３５：第１有害光カット部材、３６：第２有害光カット部材、３７：ギヤ、３８：ギヤ、３９：ギヤ、４０：第１連結ギヤ、４１：第２連結ギヤ、４２：第３連結ギヤ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a camera having a variable power optical system, and more particularly to a camera that prevents flare from occurring even when performing wide-angle shooting or telephoto shooting.
[0002]
[Prior art]
As a variable power optical system attached to a camera, the one shown in FIG. 13 is conventionally known.
The variable power optical system 100 shown in this figure is an optical system having six groups and six lenses composed of six lenses 101 to 106, and a first group composed of lenses 101 to 104 as shown in FIGS. By changing the magnification by changing the distance between the lens 107 and the second group lens 108 including the lenses 105 and 106, it is possible to perform both wide-angle shooting and telephoto shooting.
In such a variable power optical system 100, when wide-angle shooting or telephoto, the light beam incident on the optical axis (center light beam), and when the aperture size corresponding to the 35 mm film is 24 × 36, the short side (= 24 ), The light beam (long side light beam) incident on the long side (= 36) when the aperture size is 24 × 36, and the diagonal light beam when the aperture size is 24 × 36. A member supporting each of the lenses 101 to 106, a member for changing the magnification, and the like do not enter inside a light beam necessary for photographing (hereinafter, referred to as a necessary light beam) such as an incident light beam (diagonal light beam). As such, each of these members must be arranged.
[0003]
[Problems to be solved by the invention]
By the way, in recent years, the lens barrel supporting each of the lenses 101 to 106 and the like is often downsized to reduce the size of the entire camera, and it is difficult to attach a hood or the like to the tip of the lens barrel.
For this reason, when the variable power optical system 100 is telephoto, and when an object on the side of an intense light source such as sunlight is being photographed, such intense light is prevented from entering the viewfinder. However, there is a problem in that sunlight is reflected on the lens end face, the inner wall of the lens barrel, and the like, and the reflected light reaches the film, thereby causing flare.
Accordingly, in such a variable power optical system 100, as shown in FIG. 16, in the inside of the lens barrel 109, each part (the flare source part 110) outside the diagonal light beam is provided with irregularities, A method of diffusing the reflected light by applying a light to reduce the reflectance, a method of arranging the harmful light cut sheet 111 outside the short side light beam at the time of telephoto shooting to cut the harmful light beam as shown in FIG. This prevents flare from occurring.
However, in each of these flare prevention methods, as shown in FIG. 17, for the short side luminous flux, incident light into the lens barrel 109 or reflected light from the lens barrel 109 can be effectively cut. As shown in FIG. 16, with respect to the diagonal light beam at the time of telephoto shooting, there is a problem that it is difficult to completely remove the harmful light beam at the end face portion 112, and it is impossible to completely prevent flare.
In view of the above circumstances, the present invention, in claim 1, when the magnification or the like is changed, the entrance aperture shape is changed in accordance with the magnification or the like, and when performing wide-angle shooting or when performing telephoto shooting. Another object of the present invention is to provide a camera capable of reducing harmful light due to reflection in a lens barrel or the like and preventing occurrence of flare or the like.
[0004]
According to the second aspect, when the magnification or the like is changed, the shape of the entrance aperture is electrically changed in accordance with the magnification or the like, and when performing wide-angle imaging while simplifying a mechanical mechanism, It is another object of the present invention to provide a camera capable of reducing harmful light caused by reflection in a lens barrel or the like when performing telephoto shooting, thereby preventing occurrence of flare or the like.
According to the third aspect, when the magnification or the like is changed and a release operation is performed, the entrance aperture shape is electrically changed in accordance with the content of the change or the like to simplify the mechanical mechanism. Provided is a camera capable of reducing harmful light caused by reflection in a lens barrel or the like without delay even when performing wide-angle shooting or telephoto shooting, thereby preventing occurrence of flare or the like. It is aimed at.
According to the fourth aspect, when the magnification or the like is changed, the two members are rotated in different directions in accordance with the magnification or the like, thereby changing the shape of the entrance aperture and simplifying the mechanical mechanism. Provide a camera that can reduce harmful light caused by reflection in the lens barrel and the like to prevent occurrence of flare even when performing wide-angle shooting and telephoto shooting while It is intended to be.
According to a fifth aspect of the present invention, when the magnification or the like is changed, the shape of the entrance aperture is changed with the force of the same driving source as the driving source of the focusing lens in accordance with the magnification or the like, and the number of parts is reduced. The simplicity of the mechanical mechanism reduces harmful light caused by reflections inside the lens barrel and reduces flare during wide-angle shooting and telephoto shooting. It is an object of the present invention to provide a camera capable of preventing such a situation.
According to a sixth aspect of the present invention, when the magnification or the like is changed, the shape of the entrance aperture is changed, held, or released in accordance with the magnification or the like, while eliminating the need for an actuator or the like for release. While simplifying the part, it is possible to reduce harmful light caused by reflection in the lens barrel and the like and prevent occurrence of flare when performing wide-angle shooting or telephoto shooting. It aims to provide a camera.
[0005]
According to a seventh aspect, when the magnification or the like is changed, the harmful light cut holding mechanism and the harmful light cut release mechanism are operated based on whether or not the magnification is within a preset magnification range, and the entrance aperture is changed. When performing wide-angle shooting without changing the shape, holding and releasing the shape, simplifying the mechanical mechanism, and performing special operations such as harmful light cut release operation, you can also use telephoto shooting. It is an object of the present invention to provide a camera which can reduce harmful light caused by reflection in a lens barrel or the like even when performing the operation, thereby preventing occurrence of flare or the like.
According to the present invention, when the magnification or the like is changed, the driving source of the focus adjusting lens is operated by a simple control procedure in accordance with the magnification or the like to change the shape of the entrance aperture, and wide-angle shooting is performed. An object of the present invention is to provide a camera capable of reducing harmful light caused by reflection in a lens barrel or the like and preventing occurrence of a flare or the like when performing a telephoto shooting.
According to the ninth aspect, when the magnification or the like is changed, the shape of the entrance aperture is changed in accordance with the magnification or the like, so that when performing wide-angle shooting or telephoto shooting, the inside of the lens barrel or the like is changed. A camera that can reduce harmful light caused by the reflection of light, prevent flare and the like, and return to the normal state even if some abnormality occurs when changing the shape of the entrance aperture. It is intended to provide.
According to the tenth aspect, when the magnification or the like is changed, the shape of the entrance aperture is changed in accordance with the magnification or the like, so that when performing wide-angle shooting or telephoto shooting, the inside of the lens barrel or the like is changed. In addition to reducing harmful light caused by the reflection of light, it is possible to prevent the occurrence of flares and the like. It is intended to provide a camera that can be returned.
[0006]
According to the eleventh aspect, when the start of imaging is instructed, the shape of the entrance aperture is changed in accordance with the magnification and the like while continuously operating the components such as the optical system by a simple control procedure, and the wide-angle imaging is performed. It is an object of the present invention to provide a camera that reduces harmful light caused by reflection in the lens barrel or the like and prevents occurrence of flare or the like even when performing zooming or telephoto shooting.
According to a twelfth aspect, when the magnification or the like is changed, the drive source of the focus adjusting lens is operated by a simple control procedure different from the control procedure of the eighth aspect in accordance with the magnification or the like, and the entrance aperture is changed. A camera that can change its shape and reduce harmful light caused by reflections inside the lens barrel, etc., when performing wide-angle shooting or telephoto shooting, to prevent the occurrence of flare etc. It is intended to provide.
According to the thirteenth aspect, when the magnification is changed after the optical system is set to the initial state, for example, when the power is turned on, the entrance aperture is changed in accordance with the magnification to perform wide-angle shooting. Another object of the present invention is to provide a camera that reduces harmful light caused by reflection in a lens barrel or the like when performing telephoto shooting, thereby preventing occurrence of flare or the like.
According to a fourteenth aspect, when the power is turned on, the optical system is set to the initial state by a simple control procedure, and when the magnification or the like is changed, the entrance aperture is changed in accordance with the magnification or the like. It is an object of the present invention to provide a camera that reduces harmful light caused by reflection inside a lens barrel or the like and prevents occurrence of flare even when performing wide-angle shooting and telephoto shooting. .
According to a fifteenth aspect, when the start of imaging is instructed, wide-angle imaging is performed by changing the shape of the entrance aperture in accordance with the magnification and the like while continuously operating each unit such as the optical system by a simple control procedure. It is an object of the present invention to provide a camera that reduces harmful light caused by reflection in the lens barrel or the like and prevents occurrence of flare or the like even when performing zooming or telephoto shooting.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, in the camera according to the first aspect, a variable power optical system including a plurality of lens groups is disposed before an entrance surface to the variable power optical system, And harmful light cutting means for changing the shape.
According to a second aspect of the present invention, in the camera according to the first aspect, the variable magnification optical drive system is displaced along the optical axis, so that the variable magnification operation driving member and the variable magnification operation driving member are operated. Zooming amount detecting means for detecting an amount of displacement caused by the doubling operation; harmful light cut driving means for electrically driving the harmful light cutting means; and the harmful light cutting based on an output from the scaling amount detecting means. Optical system control means for controlling the amount of harmful light cut by the driving means.
According to a third aspect of the present invention, there is provided the camera according to the second aspect, further comprising a camera control unit and a release unit for instructing the camera to start photographing. Based on the output, the optical system control means is operated to read the output of the variable power detection means, and the displacement of the harmful light cut drive means is controlled based on the output and a preset relationship. It is characterized by having
According to a fourth aspect of the present invention, in the camera according to the third aspect, the harmful light cutting unit includes two harmful light cutting members having an opening shape at a wide angle, and different directions of the harmful light cutting members. It is characterized by being rotated to cut off harmful light generated at telephoto.
According to a fifth aspect of the present invention, in the camera according to the fourth aspect, the harmful light cut drive unit includes a drive motor and a harmful light cut drive transmission unit, and the drive motor is configured to change the drive of the harmful light cut unit. It is characterized in that it serves as both a driving source for driving a focus adjusting lens in the magnification optical system.
[0008]
According to a sixth aspect of the present invention, in the camera according to the fifth aspect, when the amount of movement of the harmful light cut drive transmitting means belongs to a predetermined area A, the harmful light cut drive is performed. Harmful light cut holding means for holding the position moved by the transmitting means, and harmful light cut release means for releasing the harmful light cut holding means when belonging to a predetermined area B different from the area A; It is characterized by including.
According to a seventh aspect of the present invention, in the camera according to the sixth aspect, the harmful light cut holding unit and the harmful light cut release unit are rotatable with a claw provided on a circumference of a set angle range. A ring, a ring spring that pulls the ring in one rotation direction, a rotatable locking claw that prevents rotation of the ring that is urged to rotate in one direction by the ring spring, and A locking pawl spring directed to the part direction, wherein when the ring is within a set angle range, the locking pawl prevents rotation of the ring, and when the ring rotates beyond the set angle range, The rotation inhibition by the locking claw is released.
According to an eighth aspect of the present invention, in the camera according to the sixth aspect, the camera further includes a focus adjustment lens driving unit that operates the focus adjustment lens, and a driving motor is driven by the optical system control unit to set the initial position ( When the camera is rotated in a preset rotation direction (for example, CW) from a state before the photographing start is instructed by the release unit, the harmful light cut drive transmitting unit enters the area A, and When the drive motor is driven to rotate in the same direction, the harmful light cut drive transmitting means enters the area B, and the drive motor is driven by the optical system control means to move the drive motor from the initial position to the rotational direction. When the lens is rotated in the opposite direction (for example, CCW), the movement of the focus adjustment lens is started by the focus adjustment lens driving unit, and the focus adjustment lens is moved from the initial position. It is moved by a constant amount of movement, the drive motor after this when rotated in the reverse direction (CW) to the aforementioned, the focusing lens is thus being moved toward its initial position.
According to a ninth aspect of the present invention, in the camera according to the seventh aspect, when the power of the camera is turned on / the power is turned on, an instruction is issued to the optical system control means to perform an initial reset of the drive motor. It is characterized by having.
[0009]
According to a tenth aspect of the present invention, in the camera according to the ninth aspect, a drive motor stop member for preventing rotation of the drive motor is provided in the area B, and the driving is performed as an initial reset operation by the initial reset operation instruction means. After the drive motor is rotated in a predetermined rotation direction (CW) by an amount from the initial position of the motor to the drive motor stop member in the area B, the drive motor is rotated in a predetermined rotation direction (CCW). ) Performs an operation of rotating by a predetermined amount.
According to claim 11, in the camera according to claim 8, when the photographing start is instructed by the release means, the camera control means issues an instruction to the optical system control means to detect the magnification change amount. The output of the means is read, and the amount of displacement of the harmful light cut drive means / the cumulative number of rotations of the drive motor with respect to the initial position in the area A is calculated based on the output and a preset relationship. Calculating the cumulative rotational speed for focus adjustment of the drive motor based on the value calculated by the distance measuring means and the relationship between the amount of displacement / the cumulative rotational speed of the drive motor and a preset relationship; Based on the value calculated from the above and the value from the initial position to the area B and the preset relationship, the release cumulative rotation number is calculated, and the optical system control means presets the drive motor. The rotation direction (CW) and the amount of displacement / accumulated rotation speed of the drive motor, and after the drive motor stops, the optical system control means causes the drive motor to rotate the drive motor in a direction opposite to the rotation direction. A direction (CCW) and the cumulative number of rotations for focus adjustment are instructed, and after the photographing operation of the camera, such as a shutter operation, is completed, the rotation direction (CW) preset by the optical system control means for the drive motor and the release cumulative number. The optical system control means instructs the drive motor to indicate the direction of rotation (CCW) and the cumulative number of revolutions from the area B to the initial position after the drive motor is stopped. And
According to a twelfth aspect of the present invention, in the camera according to the sixth aspect, there is provided a focusing lens driving unit for operating the focusing lens, and the driving motor is moved to an initial position (before the photographing start is instructed by the release unit). State), the harmful light cut drive transmission means is in the area B, and the drive motor is driven by the optical system control means to be rotated in a preset rotation direction (CCW). When the harmful light cut drive transmission means enters the area A, and thereafter the drive motor is driven to rotate in the same direction, the focus adjustment lens drive means causes the focus adjustment lens to move from the initial position. After being moved and moved by a predetermined amount, when the drive motor is rotated in the opposite direction (CW), the focusing lens is moved to the initial position. It is characterized by moving the direction.
[0010]
According to a thirteenth aspect, in the camera according to the twelfth aspect, when the power of the camera is turned on or when the power is turned on, an instruction is issued to the optical system control means to initialize the drive motor. It is characterized by having. According to a fourteenth aspect, in the camera according to the thirteenth aspect, a drive motor stop member for preventing rotation of the drive motor is provided in the area B, and the drive is performed as an initial reset operation by the initial reset operation instruction means. An operation of rotating the drive motor in a preset rotation direction (CW) by an amount from the initial position of the motor to the drive motor stop member in the area B is performed.
According to a fifteenth aspect, in the camera according to the twelfth aspect, when the photographing start is instructed by the release means, the camera control means issues an instruction to the optical system control means to detect the magnification change amount. Means for reading the output of the means and calculating the displacement amount of the harmful light cut drive means with respect to the set position in the area A / the cumulative number of rotations of the drive motor based on the output and a preset relationship. Based on the value calculated by the distance measuring means, the displacement amount / accumulated rotation number of the drive motor, and a preset relationship, the focus adjustment cumulative number of rotations of the drive motor is calculated, and the distance measurement means of the camera is used. Based on the calculated value, the value from the initial position to the area B, and the preset relationship, the release cumulative rotation speed is calculated, and the optical system control unit sets the release motor in advance. And the accumulated rotation number set between the region B and the region for operating the focusing lens. After the drive motor stops, the optical system is controlled. The control means instructs the drive motor to set a preset rotation direction (CW) and the displacement / accumulated rotation speed of the drive motor. After the drive motor stops, the optical system control means sends a signal to the drive motor. A direction of rotation (CCW) opposite to the direction of rotation and the cumulative number of rotations for focus adjustment are instructed, and after completion of a photographing operation of a camera such as a shutter operation, a rotation direction (CW) is transmitted from the optical system control means to the drive motor. The release cumulative number of rotations is instructed.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
FIGS. 1 and 2 are schematic diagrams showing the effect of one embodiment of the camera according to the present invention. FIG. 1 shows a necessary light beam range 3 for wide-angle shooting at a position A (incident surface) shown in FIG. A required luminous flux range 4 at the time of photographing and a harmful light cut range (shaded area) 2 at the time of telephoto photography are shown. FIG. 2 shows a required luminous flux range 3 at the time of position A in FIG. The required luminous flux range 4 at the time and the required luminous flux range 3 at the time of wide-angle shooting are respectively rotated by 30 ° in the clockwise (CW) and counterclockwise (CCW) directions.
As is apparent from the above, from the required luminous flux range 3 at the time of wide-angle photography, the required luminous flux range 3 at the time of wide-angle photography is rotated by 30 ° in the CW direction, and the required luminous flux range 3 at the time of wide-angle photography is changed to CCW. By removing the range rotated by 30 °, harmful light in the diagonal direction at the time of telephoto shooting can be cut.
As described above, by placing the harmful light cutting means for changing the aperture with zooming in front of the entrance surface of the zoom optical system 1, the flare mainly generated on the inner surface of the lens barrel during telephoto shooting is reduced. Can be prevented.
[0012]
FIG. 3 is a block diagram showing a control configuration example of the camera according to the present invention.
The variable magnification optical system 1 in the drawing refers to an optical system configured by a first lens group 10 including lenses 6 to 9 and a second lens group 13 including lenses 11 and 12. .
The variable power driving member 14 includes a variable power motor, a transmission system such as gears, and a lens barrel. When the variable power motor is driven, the optical axis of the variable power optical system 1 is controlled. A member that changes the position of the second lens group 13 along the direction.
The zooming amount detecting means 15 is a means for detecting the position of the second lens group 13 changed by the zooming motor, and uses a potentiometer, an encoder or the like.
The optical system control means 16 reads the output (magnification position information) from the magnification change detection means 15 and generates a drive voltage or the like based on this value and a preset relation amount. A camera or the like includes a CPU (microcomputer) in the camera, a DRIC (drive IC) for driving and controlling an actuator, and the like.
The harmful light cut drive unit 17 is composed of an actuator as a drive source and a transmission system for transmitting the power, and a DC motor or a pulse motor is used as the drive source.
Further, the harmful light cutting means 18 is constituted by a plurality of blades (a first harmful light cut member 35 and a second harmful light cut member 36 shown in FIG. 8) arranged in front of the incident surface of the variable power optical system 1.
[0013]
FIGS. 4 to 8C are mechanical diagrams of the focusing drive mechanism 19 and the harmful light cut drive means 18 used in the camera according to the present invention.
FIG. 4 shows a motor 20 serving as a drive source among components constituting the focus drive mechanism 19 and a configuration diagram from a reduction system 21 using gears and the like to a drive ring 22. Here, it is assumed that when the motor 20 rotates in the CW direction, the drive ring 22 rotates in the CCW direction, and this state (the state of the drive pin 23 on the drive ring 22 in the figure) is set as the initial position.
FIG. 5 is a sectional view of the variable power optical system 1 and the focusing drive mechanism 19 used in the camera according to the present invention.
A focusing lens group 24 constituting the first group lens 10 in FIG. 5 includes focusing lenses 6, 7 and the like and cells supporting the lenses 6, 7 and the like. Rotation is prevented, and it is possible to move straight in the optical axis direction. Further, a helicoid 26 is provided on the outer periphery of the focusing lens group 24, and the rotation of the focus driving ring 27 causes the focusing lens group 24 to move straight in the optical axis direction.
In addition, as a camera, a distance to a subject is detected by an automatic focusing device (AF) (not shown), a movement amount of the focusing lens group 24 is calculated, and the focusing lens group 24 is moved. After the shutter is released and the shutter is closed, the focus lens group 24 is returned to the original position (initial position).
[0014]
6A and 6B are diagrams each showing an operation example of the focusing drive mechanism 19, FIG. 6A shows an initial position, and FIG. 6B shows a state at the time of focusing. ing.
The drive pins 23 in FIGS. 6A and 6B are drive pins on the drive ring 22. The focus drive ring 27 is urged in the CCW direction by a focus drive ring spring 28, and is prevented from rotating by a stopper 29 on the focus lens group guide member 25.
When the motor 20 rotates in the CCW direction and the drive ring 22 rotates in the CW direction, the drive pin 23 rotates the focus drive ring 27 in the CW direction against the focus drive ring spring 28. A helicoid (female) 26 is formed on the inner peripheral surface of the focus drive ring 27, and is rotationally guided by a focus lens group guide member 25.
FIG. 6B shows a state in which the focus lens group 24 is moved, and then the shutter is released.
[0015]
7 (a), 7 (b) and 7 (c) show the harmful light cut drive means 17, respectively. FIG. 7 (a) shows the initial position, and FIG. 7 (c) shows a state where the holding of the harmful light cutting means 17 has been released.
The drive pins 23 in FIG. 7A are drive pins on the drive ring 22. The ring 30 on which the gear 37 is formed is urged in the CW direction by the ring spring 31, and its rotation is prevented by the stopper 29 on the focusing lens group guide member 25. As shown in the drawing, a locking claw 33 is disposed outside the outer circumference of the ring 30 so as to engage with a claw 32 formed on the outer circumference of the ring 30. A pawl spring 34 is engaged.
Further, when the locking claw 33 is in a free state by the locking claw spring 34, the claw portion of the locking claw 33 is oriented substantially in the optical axis direction. When the motor 20 rotates in the CW direction, that is, the direction opposite to the direction in which the focusing lens group 24 performs the focusing operation, and the drive ring 22 rotates in the CCW direction, the ring 30 Rotate in the CCW direction against
When the ring 30 rotates by a predetermined amount, the locking claw 33 and the claw portion 32 of the ring 30 function to bring about a state as shown in FIG. , The ring 30 is held in the harmful light cutting means holding state.
7B, when the drive ring 22 further rotates, the state shown in FIG. 7C is reached, and the harmful light cutting means holding state is released, and when the drive pin 23 rotates in the CW direction, The ring spring 31 rotates the ring 30 in the CW direction.
According to the present invention, the operation of the locking claw 33 and the claw portion 32 of the ring 30 results in a state as shown in FIG. 7B (a state of holding the harmful light cutting means), and the drive pin 23 rotates in the CW direction. Even so, the area where the ring 30 is kept in a state where harmful light is cut is referred to as area A, and the driving ring 22 is further rotated than in FIG. The area in which the state of holding the harmful light cut means is released is called an area B.
[0016]
8 (a) to 8 (c) show the harmful light cutting means 18, FIG. 8 (a) shows the initial position, and FIG. 8 (b) shows the required luminous flux range at the time of wide-angle shooting at the center. FIG. 8C shows a state in which the first harmful light cut member (first harmful light cut member) 35 in which the opening corresponding to No. 3 is formed is rotated by 30 ° in the CCW direction, and FIG. This shows a state in which the second harmful light cut member (second harmful light cut member) 36 in which an opening corresponding to the necessary light flux range 3 at the time of shooting is formed is rotated by 30 ° in the CW direction.
The first harmful light cut member 35 and the second harmful light cut member 36 are provided with gears 38 and 39 on the outer circumference as shown in the figure, respectively, and as shown in FIG. When the first connecting gear 40 is rotated in the CW direction by the gear 37 formed on the outer periphery of the ring 30 while rotating in the CCW direction, the gear 38 meshing with the first connecting gear 40 is moved in the CCW direction. By rotating, the first harmful light cut member 35 is rotated in the CCW direction to realize two harmful light cut ranges 2 having a diagonal relationship among the four harmful light cut ranges 2 shown in FIG.
At this time, as shown in FIG. 8C, the second connecting gear 41 is rotated in the CW direction by the gear 37 formed on the outer periphery of the ring 30, and meshes with the second connecting gear 41. The third connection gear 42 is rotated in the CCW direction. As a result, the gear 39 meshing with the third connecting gear 42 is rotated in the CW direction, and the second harmful light cutting member 36 is rotated in the CW direction, and the four harmful light cutting ranges 2 shown in FIG. Among them, the remaining two harmful light cut ranges 2 having a diagonal relationship are realized.
[0017]
FIG. 9 is a sequence diagram when the positions shown in FIGS. 7A and 8A are adopted as the initial positions.
As shown in the figure, first, the sequence of the camera is started by a release means (not shown), and after a series of sequences such as photometry and AF, the camera comes to a lower start position in the figure. From here, the sequence proceeds to the left of the figure (the drive ring 22 rotates in the CCW direction), and the output (magnification position information) from the magnification change amount detecting means 15 is read. When the camera 1 is in the telephoto shooting state, the drive of the harmful light cut drive unit 17 is controlled, and the drive ring 22 is stopped in the area A.
Thereafter, the sequence proceeds to the right in the figure (the drive ring 22 rotates in the CW direction while the ring 30 is held), the focus drive ring 27 is rotated in the CW direction, and the focusing lens group 24 is automatically moved (not shown). Stop at the position determined by the focusing device (AF).
In this state, the shutter is opened and closed, and then the sequence proceeds to the left in the figure to return the focusing lens group 24 to the original position (initial position).
Further, the sequence proceeds to the left and proceeds to region B. Here, the holding state of the ring 30 is released. Thereafter, the sequence proceeds to the right in the drawing (the drive ring 22 rotates in the CW direction) and stops at the initial position.
[0018]
FIG. 10 is a reset sequence diagram for the sequence shown in FIG. This is a reset method when an abnormality occurs, such as when the power supply or the like is lost during the sequence of FIG.
Generally, in order to stop the focusing lens group 24 at the target position, a method of using a pulse motor or a DC motor as a motor used as a driving source and reading the rotation speed with a photo interrupter or the like is known. Has been adopted. In such a case, since there is no absolute position information with respect to the fixed system, there is no detection method when the vehicle stops halfway. Therefore, such a reset sequence is required.
When the harmful light cutting unit holding release position shown in FIG. 7C is adopted as the initial position, the sequence diagram shown in FIG. 11 is used instead of the sequence diagram shown in FIG.
As shown in the figure, the start of the sequence of the camera starts with release means (not shown), and after a series of sequences such as photometry and AF, the camera comes to the lower start position in the figure. From here, the sequence proceeds to the right in the figure (the drive ring 22 rotates in the CW direction), and stops at the set position between wide-angle shooting and near in the figure. Thereafter, the sequence proceeds to the left of the figure (the drive ring 22 rotates in the CCW direction), reads the output (magnification position information) from the magnification change amount detecting means 15, and based on this value, the magnification optical system When the camera 1 is in the telephoto shooting state, the drive of the harmful light cut drive unit 17 is controlled, and the drive ring 22 is stopped in the area A.
Thereafter, the sequence proceeds to the right in the figure (the driving ring 22 rotates in the CW direction while the ring 30 is held), the focus driving ring 27 is rotated in the CW direction, and the focusing lens group 24 is automatically moved (not shown). Stop at the position determined by the focusing device (AF).
In this state, the shutter is opened and closed, and then the sequence proceeds to the left in the figure to return the focusing lens group 24 to the original position (initial position).
Further, the sequence proceeds to the left and stops at the initial position provided in the area B.
FIG. 12 is a reset sequence diagram for the sequence shown in FIG. This is a reset method when an abnormality occurs, such as when the power supply or the like is lost during the sequence of FIG.
Needless to say, the focusing in FIGS. 9 to 12 may be reversed in the near and inf positions.
[0019]
【The invention's effect】
As described above, according to the present invention, when the magnification or the like is changed, the shape of the entrance aperture is changed in accordance with the magnification or the like, and even when performing wide-angle shooting, telephoto shooting is also possible. When performing the above, it is also possible to reduce harmful light caused by reflection inside the lens barrel or the like, thereby preventing occurrence of flare or the like.
Further, in the camera of claim 2, when the magnification or the like is changed, the shape of the entrance aperture is electrically changed in accordance with the magnification or the like, and the wide-angle shooting is performed while simplifying the mechanical mechanism. Also, when performing telephoto shooting, it is possible to reduce harmful light due to reflection inside the lens barrel or the like, thereby preventing occurrence of flare or the like.
Further, in the camera according to the third aspect, when the magnification or the like is changed and the release operation is performed, the entrance aperture shape is electrically changed in accordance with the content of the change or the like to simplify the mechanical mechanism. While performing wide-angle shooting and telephoto shooting, it is possible to reduce harmful light caused by reflection in the lens barrel and the like without delay, thereby preventing flare and the like.
In the camera according to the fourth aspect, when the magnification or the like is changed, the shape of the entrance aperture is changed by rotating the two members in different directions in accordance with the magnification or the like, thereby providing a mechanical mechanism. Simplicity, harmful light due to reflections in the lens barrel and the like can be reduced in both wide-angle shooting and telephoto shooting to prevent flare and the like.
Further, in the camera according to the fifth aspect, when the magnification or the like is changed, the entrance aperture shape is changed with the same driving source as the driving source of the focusing lens in accordance with the magnification or the like, thereby reducing the number of parts. In addition to simplifying the mechanical mechanism, when performing wide-angle shooting and telephoto shooting, it reduces harmful light caused by reflection inside the lens barrel and reduces flare. Generation can be prevented.
Further, in the camera according to the sixth aspect, when the magnification or the like is changed while eliminating the need for an actuator or the like for release, the shape of the entrance aperture is changed, held, or released in accordance with the magnification or the like, and mechanically. To reduce harmful light caused by reflections inside the lens barrel and to prevent flare during wide-angle shooting and telephoto shooting, while simplifying the essential mechanical parts. Can be.
[0020]
In the camera according to claim 7, when the magnification or the like is changed, the harmful light cut holding mechanism and the harmful light cut release mechanism are operated based on whether the magnification is within a preset magnification range, Even when performing wide-angle shooting without changing the shape of the entrance aperture, simplifying the mechanical mechanism, and performing special operations such as harmful light cut release operation, it is also telephoto. Even when photographing, it is possible to reduce harmful light caused by reflection in the lens barrel or the like, thereby preventing occurrence of flare or the like.
Further, in the camera according to the present invention, when the magnification or the like is changed, the driving source of the focus adjusting lens is operated by a simple control procedure in accordance with the magnification or the like to change the shape of the entrance aperture, and the wide angle Both when taking a picture and when taking a telephoto picture, it is possible to reduce harmful light caused by reflection in the lens barrel or the like, thereby preventing occurrence of flare or the like.
Further, in the camera according to the ninth aspect, when the magnification or the like is changed, the shape of the entrance aperture is changed in accordance with the magnification or the like, so that the lens barrel can be used for both wide-angle shooting and telephoto shooting. By reducing harmful light caused by internal reflection, it is possible to prevent the occurrence of flares and the like, and when changing the shape of the entrance aperture, it is possible to return to the normal state even if any abnormality occurs. it can.
Further, in the camera according to the tenth aspect, when the magnification or the like is changed, the shape of the entrance aperture is changed in accordance with the magnification or the like, so that the lens barrel can be used for both wide-angle shooting and telephoto shooting. By reducing harmful light caused by internal reflections, it is possible to prevent the occurrence of flare and the like. It can be returned to the state. Further, in the camera according to the eleventh aspect, when the start of photographing is instructed, the shape of the entrance aperture is changed in accordance with the magnification and the like while continuously operating each unit such as the optical system by a simple control procedure, When performing wide-angle shooting or telephoto shooting, harmful light due to reflection inside the lens barrel or the like is reduced to prevent flare or the like.
[0021]
In the camera according to the twelfth aspect, when the magnification or the like is changed, the drive source of the focusing lens is operated by a simple control procedure different from the control procedure of the eighth aspect in accordance with the magnification or the like, By changing the shape of the entrance aperture, it is possible to reduce harmful light caused by reflection in the lens barrel or the like and prevent flare from occurring even when performing wide-angle shooting or telephoto shooting. .
Further, in the camera according to the thirteenth aspect, when the power is turned on, the optical system is set to the initial state, and when the magnification or the like is changed, the entrance aperture is changed in accordance with the magnification or the like to perform wide-angle shooting. Both when performing the telephoto shooting and when performing the telephoto shooting, the harmful light due to the reflection inside the lens barrel or the like is reduced to prevent the occurrence of flare or the like.
Further, in the camera according to the fourteenth aspect, when the optical system is set to the initial state by a simple control procedure at the time of power-on or the like, when the magnification or the like is changed, the entrance aperture is set in accordance with the magnification or the like. When performing wide-angle photographing and telephoto photographing, harmful light caused by reflection inside the lens barrel or the like is reduced to prevent occurrence of flare or the like.
Further, in the camera according to claim 15, when the start of shooting is instructed, the shape of the entrance aperture is changed in accordance with the magnification and the like while continuously operating each unit such as the optical system by a simple control procedure, When performing wide-angle shooting or telephoto shooting, harmful light due to reflection inside the lens barrel or the like is reduced to prevent flare or the like.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an effect of one embodiment of a camera according to the present invention.
FIG. 2 is a schematic diagram illustrating an effect of one embodiment of a camera according to the present invention.
FIG. 3 is a block diagram illustrating a control configuration example of a camera according to the present invention.
FIG. 4 is a mechanism diagram of a focusing drive mechanism and a harmful light cut drive unit used in the camera according to the present invention.
FIG. 5 is a sectional view of a variable power optical system and a focusing drive mechanism used in the camera according to the present invention.
FIG. 6 is a schematic diagram showing an operation example of a focusing drive mechanism used in the camera according to the present invention.
FIG. 7 is a schematic diagram showing an operation example of a harmful light cut drive unit used in the camera according to the present invention.
FIG. 8 is a schematic diagram showing an operation example of the harmful light cutting means used in the camera according to the present invention.
FIG. 9 is a diagram showing an example of a sequence used in the camera according to the present invention.
FIG. 10 is a diagram showing a reset sequence for the sequence shown in FIG. 9;
FIG. 11 is a diagram showing another sequence example used in the camera according to the present invention.
FIG. 12 is a diagram showing a reset sequence for the sequence shown in FIG. 11;
FIG. 13 is a schematic configuration diagram generally illustrating an example of a variable power optical system.
14 is a schematic diagram showing an example of each light beam of the variable power optical system shown in FIG.
15 is a schematic diagram showing an example of each light beam of the variable power optical system shown in FIG.
FIG. 16 is a sectional view of a main part showing an example of a flare preventing method employed in a camera using the variable power optical system shown in FIG.
FIG. 17 is a cross-sectional view of a main part showing another example of a flare prevention method adopted in a camera using the variable power optical system shown in FIG.
[Explanation of symbols]
1: variable magnification optical system, 2: harmful light cut range at telephoto shooting, 3: necessary luminous flux range at wide-angle shooting, 4: necessary luminous flux range at telephoto shooting, 6: lens, 7: lens, 8: lens, 9: lens, 10: first group lens, 11: lens, 12: lens, 13: second lens group, 14: variable power driving member, 15: variable power detection means, 16: optical system control means, 17 : Harmful light cut drive means, 18: harmful light cut means, 19: focusing drive mechanism, 20: motor, 21: deceleration system, 22: drive ring, 23: drive pin, 24: focus lens group, 25: focus Lens group guide member, 26: helicoid, 27: focus drive ring, 28: focus drive ring spring, 29: stopper, 30: ring, 31: ring spring, 32: claw portion, 33: locking claw, 34 Locking claw spring, 35: first harmful light cutting member, 36: second harmful light cutting member, 37: gear, 38: gear, 39: gear, 40: first connecting gear, 41: second connecting gear, 42 : 3rd connecting gear

Claims

A camera, comprising: a variable power optical system including a plurality of lens groups; .

2. A variable power driving member for performing a variable power operation by displacing the variable power optical system along an optical axis, and a variable power detector for detecting an amount of displacement of the variable power driving member accompanying the variable power operation. Amount detecting means, a harmful light cut driving means for electrically driving the harmful light cutting means, and an optical system for controlling a harmful light cut amount of the harmful light cut driving means based on an output from the variable power detecting means. A camera comprising: control means.

In claim 2, having a camera control means and a release means for instructing the start of shooting of the camera, when the start of shooting is instructed by the release means, operating the optical system control means based on the output from the camera control means, A camera which reads an output of said zooming amount detecting means and controls a displacement amount of said harmful light cut driving means based on this output and a preset relationship.

The harmful light cutting means according to claim 3, wherein the harmful light cutting means comprises two harmful light cutting members having an opening shape at a wide angle, and rotating each harmful light cutting member in a different direction to reduce harmful light generated at telephoto. A camera characterized by being cut.

5. The harmful light cut drive unit according to claim 4, wherein the harmful light cut drive unit includes a drive motor and a harmful light cut drive transmission unit, and the drive motor drives the harmful light cut unit and the focus adjustment lens in the variable magnification optical system. A camera characterized in that it is a driving source for both.

6. The harmful light cut holding unit according to claim 5, wherein the harmful light cut driving means holds a position moved by the harmful light cut drive transmitting means when a moving amount of the harmful light cut drive transmitting means belongs to a preset area A. And a harmful light cut canceling means for canceling holding by the harmful light cut holding means when belonging to a predetermined area B different from the area A.

7. The harmful light cut holding means and the harmful light cut release means according to claim 6, wherein the harmful light cut release means has a rotatable ring provided with a claw portion on a circumference of a set angle range, and pulls the ring in one rotation direction. A ring spring, a rotatable locking claw that prevents rotation of the ring that is rotationally biased in one direction by the ring spring, and a locking claw spring that directs the locking claw toward the claw portion. When the ring is within a set angle range, the rotation of the ring is prevented by the locking claw, and when the ring rotates beyond the set angle range, rotation prevention by the locking claw is released. And the camera.

7. The camera according to claim 6, further comprising a focus adjusting lens driving unit that operates the focus adjusting lens, wherein a driving motor is driven by the optical system control unit, and an initial position (a start of shooting is instructed by the release unit). The state before rotation), the harmful light cut drive transmitting means enters the area A when the drive motor is rotated in the same direction. Light cut drive transmitting means enters the area B,
Further, when the drive motor is driven by the optical system control means and is rotated in the direction opposite to the rotation direction from the initial position, the movement of the focus adjustment lens is started by the focus adjustment lens drive means. Wherein the focus adjusting lens is moved in the direction of the initial position when the drive motor is further rotated in the opposite direction from the initial position.

8. The camera according to claim 7, further comprising: an initial reset operation instructing unit that issues an instruction to the optical system control unit when the power of the camera is turned on / power is turned on, and performs an initial reset of the drive motor.

10. The drive motor according to claim 9, further comprising a drive motor stop member for preventing rotation of the drive motor in the area B, and performing an initial reset operation by the initial reset operation instruction means from an initial position of the drive motor to the area B. After the drive motor is rotated in a predetermined rotation direction by an amount reaching a stop member, an operation of rotating the drive motor in a predetermined rotation direction by a predetermined amount is performed. A camera characterized in that:

In Claim 8, when the photographing start is instructed by the release means,
The camera control means issues an instruction to the optical system control means to read the output of the variable power detection means, and the harmful light with respect to the initial position in the area A based on this output and a preset relationship. The amount of displacement of the cut drive means / the cumulative number of rotations of the drive motor is calculated,
Based on a value calculated from the distance measuring means of the camera, the displacement amount / accumulated rotation speed of the drive motor, and a preset relationship, a cumulative focus adjustment rotation speed of the drive motor is calculated,
Based on the value calculated from the distance measuring means of the camera and the value from the initial position to the area B and a preset relationship, the release cumulative rotation number is calculated,
The optical system control means instructs the drive motor to indicate a preset rotation direction (CW) and the displacement / accumulated rotation speed of the drive motor;
After the drive motor is stopped, the optical system control means instructs the drive motor to indicate a rotation direction opposite to the rotation direction and the cumulative rotational speed for focus adjustment,
After the photographing operation of the camera such as a shutter operation is completed, the drive system is instructed by the optical system control unit to the preset rotation direction and the release cumulative rotation speed,
A camera, wherein after the drive motor is stopped, the optical system control means instructs the drive motor to indicate a rotation direction and the cumulative number of rotations from the area B to an initial position.

7. The image forming apparatus according to claim 6, further comprising a focusing lens driving unit that operates the focusing lens.
When the drive motor is at the initial position, the harmful light cut drive transmission unit is in the area B,
When the drive motor is driven by the optical system control means and is rotated in a preset rotation direction, the harmful light cut drive transmission means enters the area A, after which the drive motor is driven to the same position. When driven in the direction
After the focus adjusting lens is moved from the initial position by the focus adjusting lens driving unit and moved by a predetermined amount,
A camera wherein the focus adjusting lens moves in the direction of the initial position when the drive motor is rotated in the opposite direction.

The camera according to claim 12,
A camera comprising an initial reset operation instructing means for issuing an instruction to the optical system control means when the power of the camera is turned on / powered on to initialize the drive motor.

The camera according to claim 13,
A drive motor stop member for preventing rotation of the drive motor is provided in the area B, and an initial reset operation by the initial reset operation instruction means is performed from the initial position of the drive motor to the drive motor stop member in the area B. A camera for performing an operation of rotating the drive motor in a predetermined rotation direction (CW) by an amount.

In claim 12,
When the start of shooting is instructed by the release means,
The camera control unit issues an instruction to the optical system control unit to read the output of the variable power detection unit, and based on this output and a preset relationship, the harmful position with respect to a set position in the area A. The amount of displacement of the light cut drive means / the cumulative number of rotations of the drive motor is calculated,
Based on a value calculated from the distance measuring means of the camera, the displacement amount / accumulated rotation speed of the drive motor, and a preset relationship, a cumulative focus adjustment rotation speed of the drive motor is calculated,
Based on the value calculated from the distance measuring means of the camera and the value from the initial position to the area B and a preset relationship, the release cumulative rotation number is calculated,
While instructing the drive motor from the optical system control means a preset rotation direction, and instructing the cumulative rotation number set between the region B and the region for operating the focus adjustment lens,
After the drive motor is stopped, the optical system control means instructs the drive motor to set a preset rotation direction and the displacement / accumulated rotation speed of the drive motor,
After the drive motor is stopped, the optical system control means instructs the drive motor to indicate a rotational direction opposite to the rotational direction and the cumulative rotational speed for focus adjustment,
A camera, wherein after the photographing operation of the camera, such as a shutter operation, is completed, the optical system control means instructs the drive motor to indicate a rotation direction and the release cumulative rotation speed.