JP4419417B2

JP4419417B2 - Optical equipment capable of image stabilization and interchangeable lenses for cameras

Info

Publication number: JP4419417B2
Application number: JP2003098222A
Authority: JP
Inventors: 隆利芦沢
Original assignee: Nikon Corp
Current assignee: Nikon Corp
Priority date: 2003-04-01
Filing date: 2003-04-01
Publication date: 2010-02-24
Anticipated expiration: 2023-04-01
Also published as: JP2004302376A

Description

【０００１】
【発明の属する技術分野】
本発明は、振動波モータを内蔵しかつ像振れ補正が可能な光学装置およびカメラ用交換レンズに関する。
【０００２】
【従来の技術】
超音波モータに代表される振動波モータは、圧電体の伸縮を利用して弾性体の駆動面に進行波を発生させ、この進行波によって移動子を駆動するものである（例えば、特許文献１）。この種の振動波モータは、低回転でも高トルクを発生することから、モータと被駆動部材との間のギアを省略できる。したがって、振動波モータを焦点調節用の駆動源としてカメラの交換レンズに搭載した場合、ギア騒音のない静粛な焦点調節動作を実現できる。また応答性がよいことから合焦レンズの位置決め精度が高いという利点もある。
【０００３】
一方、カメラの像振れ補正装置として、例えば特許文献２に開示されたものが知られている。この装置は、手振れ等に起因して発生するカメラの角速度をジャイロを用いて検出し、この角速度に基づいて補正レンズを光軸と直交する方向に駆動することで、結像面における像振れを補正する。これによれば、被写界が暗いときや絞り込んだときのようにシャッタスピードが低速であっても手振れに起因する像振れを最小限に抑制できる。
【０００４】
【特許文献１】
特公平１−１７３５４公報
【特許文献２】
特開平８−６０８９号公報
【特許文献３】
特開平７−２７０８７９号公報
【０００５】
【発明が解決しようとする課題】
上記像振れ補正装置と振動波モータの双方を搭載した交換レンズを考える。振れ検出用のジャイロは、自身が超音波振動することでコリオリ効果を利用して角速度を得るものである。このジャイロと振動波モータとが同時に駆動されるとき（像振れ補正動作と焦点調節動作を同時に行うとき）には、ジャイロに振動波モータの超音波振動が加わって振動の干渉が起こり得る。つまりジャイロの発振周波数と振動波モータの発振周波数との差の振動がうなりとして発生し、うなりの振動が手振れによる振動として誤検出されるおそれがある。その誤検出の結果に基づいて像振れ補正が行われると、満足な像振れ補正効果が得られないばかりか、逆に像振れを助長することにもなりかねない。
【０００６】
例えば特許文献３には、振動波モータ（超音波モータ）の振動が像振れ補正装置の検出部に伝達されないよう工夫したものが開示されている。これは、レンズの構成部品が振動波モータと共振しないように設計したり、緩衝材を用いて振動を減衰させるものである。しかし、超音波振動は周波数が高いために振幅の割には振動エネルギーが大きく、それをジャイロに誤検出されないレベルまで減衰させるのは困難である。また超音波モータの振動が空気中に放射され、これがジャイロに検出されることもあり、これは緩衝材等では防止できない。
【０００７】
本発明の目的は、振動波モータから像振れ補正装置への振動伝達を防ぐことなく両者の振動干渉による不具合をなくすことが可能な像振れ補正が可能な光学機器およびカメラ用交換レンズを提供することにある。
【０００８】
【課題を解決するための手段】
請求項１の発明は、像面における像の振れを補正するために駆動される補正光学系と、光学機器の振動に応じた振れ量情報を検出する像振れ検出装置と、振れ量情報に基づいて補正光学系を駆動する補正駆動装置と、振動波モータとを備えた像振れ補正が可能な光学機器に適用される。
そして、振動波モータの駆動速度に関する情報を検出する速度検出装置と、該速度検出装置の検出結果に基づいて補正駆動装置による補正光学系の駆動を許容／禁止する制御手段とを具備し、制御手段は、振動波モータの速度が、該振動波モータの振動と像振れ検出装置が発する振動とが干渉するおそれのない所定速度未満のときに補正駆動装置による補正光学系の駆動を許容し、速度が所定速度以上のときに補正駆動装置による補正光学系の駆動を禁止することを特徴とする。
請求項２の像振れ補正が可能な光学機器は、焦点調節のために駆動される焦点調節光学系、および像面における像の振れを補正するために駆動される補正光学系を含む光学系と、焦点調節光学系を駆動する振動波モータと、自身が振動を発することで光学機器の振動に応じた振れ量情報を検出する像振れ検出装置と、振れ量情報に基づいて補正光学系を駆動する補正駆動装置とを備えた光学機器において、焦点調節光学系が被写体の移動に追従するように焦点調節を繰り返し行う追尾モードが設定されている場合には、振動波モータの駆動時に補正駆動装置による補正光学系の駆動を許容するとともに、振動波モータの駆動速度の上限値を、振動波モータの振動と像振れ検出装置が発する振動とが干渉するおそれのない所定速度に制限し、追尾モードが設定されていない場合には、振動波モータの駆動時に補正駆動装置による補正光学系の駆動を禁止する制御手段を具備することを特徴とする。
請求項６の像振れ補正が可能な光学機器は、焦点調節のために駆動される焦点調節光学系、および像面における像の振れを補正するために駆動される補正光学系を含む光学系と、焦点調節光学系を駆動する振動波モータと、自身が振動を発することで光学機器の振動に応じた振れ量情報を検出する像振れ検出装置と、振れ量情報に基づいて補正光学系を駆動する補正駆動装置とを備えた光学機器において、振動波モータの駆動速度に関する情報を検出する速度検出装置と、焦点調節光学系が被写体の移動に追従するように焦点調節を繰り返し行う追尾モードの設定の有無、および速度検出装置の検出結果に基づいて補正駆動装置による補正光学系の駆動を許容／禁止する制御手段とを具備し、制御手段は、追尾モードが設定されている場合に、振動波モータの駆動速度が、振動波モータの振動と像振れ検出装置が発する振動とが干渉するおそれのない所定速度未満であるときに補正駆動装置による補正光学系の駆動を許容し、振動波モータの駆動速度が所定速度以上であるときに補正駆動装置による補正光学系の駆動を禁止することを特徴とする。
請求項７の像振れ補正が可能なカメラ用交換レンズは、像面における像の振れを補正するために駆動される補正光学系と、交換レンズの振動に応じた振れ量情報を検出する像振れ検出装置と、振れ量情報に基づいて補正光学系を駆動する補正駆動装置と、振動波モータとを備えたカメラ用交換レンズにおいて、振動波モータの駆動速度に関する情報を検出する速度検出装置と、該速度検出装置の検出結果に基づいて補正駆動装置による補正光学系の駆動を許容／禁止する制御手段とを具備し、制御手段は、振動波モータの速度が、該振動波モータの振動と像振れ検出装置が発する振動とが干渉するおそれのない所定速度未満のときに補正駆動装置による補正光学系の駆動を許容することを特徴とする。
請求項８の像振れ補正が可能なカメラ用交換レンズは、焦点調節のために駆動される焦点調節光学系、および像面における像の振れを補正するために駆動される補正光学系を含む撮影光学系と、焦点調節光学系を駆動する振動波モータと、自身が振動を発することで光学機器の振動に応じた振れ量情報を検出する像振れ検出装置と、振れ量情報に基づいて補正光学系を駆動する補正駆動装置とを備えたカメラ用交換レンズにおいて、焦点調節光学系が被写体の移動に追従するように焦点調節を繰り返し行う追尾モードが設定されている場合には、振動波モータの駆動時に補正駆動装置による補正光学系の駆動を許容するとともに、振動波モータの駆動速度の上限値を、振動波モータの振動と像振れ検出装置が発する振動とが干渉するおそれのない所定速度に制限し、追尾モードが設定されていない場合には、振動波モータの駆動時に補正駆動装置による前記補正光学系の駆動を禁止する制御手段を具備することを特徴とする。
請求項９の像振れ補正が可能なカメラ用交換レンズは、焦点調節のために駆動される焦点調節光学系、および像面における像の振れを補正するために駆動される補正光学系を含む撮影光学系と、自身が振動を発することで交換レンズの振動に応じた振れ量情報を検出する像振れ検出装置と、振れ量情報に基づいて補正光学系を駆動する補正駆動装置と、焦点調節光学系を駆動する振動波モータとを備えたカメラ用交換レンズにおいて、振動波モータの駆動速度に関する情報を検出する速度検出装置と、焦点調節光学系が被写体の移動に追従するように焦点調節を繰り返し行う追尾モードの設定の有無、および速度検出装置の検出結果に基づいて補正駆動装置による補正光学系の駆動を許容／禁止する制御手段とを具備し、制御手段は、前記追尾モードが設定されている場合に、振動波モータの駆動速度が、振動波モータの振動と像振れ検出装置が発する振動とが干渉するおそれのない所定速度未満であるときに補正駆動装置による補正光学系の駆動を許容し、振動波モータの駆動速度が所定速度以上であるときに補正駆動装置による補正光学系の駆動を禁止することを特徴とする。
請求項１０の光学機器の使用方法は、像振れ検出装置を用いて光学機器の振動に応じた振れ量情報を検出し、振れ量情報に基づいて、光学機器の像面における像の振れを補正するように光学部品を駆動し、光学機器に用いられる振動波モータの速度に関する情報を検出し、振動波モータの速度が、振動波モータの振動と像振れ検出装置が発する振動とが干渉するおそれのない所定速度未満であるときに光学部品の駆動を許容するように制御し、振動波モータの速度が、所定速度以上であるときに光学部品の駆動を禁止するように制御することを特徴とする。
【０００９】
【発明の実施の形態】
−第１の実施形態−
図１〜図６により本発明をカメラの交換レンズに適用した場合の第１の実施形態を説明する。
図１は本実施形態における交換レンズの断面図である。外筒１には固定筒２が連結され、固定筒２の内周面側に固定レンズ群３が保持されている。固定レンズ群３の後部には焦点調節のための合焦レンズ群４が配置され、更にその後部に振れ補正のための補正レンズ群５が配置されている。これらのレンズ群３〜５が撮影光学系を構成する。交換レンズはバヨネット爪部６を介して不図示のカメラボディに装着される。
【００１０】
以下、合焦レンズ群４による焦点調節および補正レンズ群５による振れ補正について詳述する。
合焦レンズ群４は、交換レンズ内に設けられた超音波モータ１０を駆動源とする。超音波モータ１０は、図２に示すように振動子１１と移動子１２とを有し、振動子１１は、圧電素子や電歪素子から成る電気−機械変換素子（以下、圧電体と呼ぶ）１１ａと、この圧電体１１ａが接合される弾性体１１ｂとから構成される。弾性体１１ｂは、共振先鋭度が大きな円環状の金属材料から成り、圧電体１１ａが接合される面と反対側の面には複数の径方向の溝が形成されている。そして、溝の間部分（突起部分）の先端面が駆動面として移動子１２に加圧接触される。なお、溝を形成するのは進行波の中立面をできる限り圧電体１１ａ側に近づけることで進行波の振幅を増幅させるためである。
【００１１】
圧電体１１ａは、円周方向に沿って２つの相（Ａ相，Ｂ相）に分かれており、各相には１／２波長ごとに交互に分極された要素が並べられ、Ａ相とＢ相との間には１／４波長分間隔が空くようにしてある。圧電体１１ａの下面には、不織布１３を挟んで加圧板１４が配置され、更にその下に加圧部材１５が配置されている。加圧部材１５は例えば皿ばねから成り、その加圧力が加圧板１４および不織布１３を介して振動子１１を移動子１２に加圧接触させる。不織布１３は振動子１１の振動が加圧板１４や加圧部材１５に伝達されるのを抑えるためのもので、例えばフェルトから成る。なお、加圧部材１５は皿ばねに限定されず、コイルばねやウェーブばねでもよい。
【００１２】
移動子１２は円環状のアルミニウムなどの軽金属から成り、下部摺動面には耐摩耗性向上のための表面処理が施されている。移動子１２の上部には、移動子１２の縦方向の振動を吸収するために振動吸収部材（例えばゴム）１６が配置され、その上部にベアリング回転部材１７が配置される。
【００１３】
図１に示すように、ベアリング回転部材１７はベアリング玉２１を介してベアリング固定部材２２に回転可能に支持されるとともに、ベアリング回転部材１７の周面にははカムリング２３が一体に連結されている。したがって、移動子１２が回転すると、ベアリング回転部材１７およびカムリング２３が一体に回転し、カムリング２３の回転に伴って合焦レンズ群４がフォーカシング駆動される。すなわち、合焦レンズ群４を保持するレンズ保持部材２４にはカムピン２４ａが突設され、このカムピン２４ａが固定筒２の光軸方向の直進溝２ａを貫通してカムリング２３のカム溝２３ａに係合されている。カムリング２３が回転すると、カム溝２３ａがカムピン２４ａを直進溝２ａに沿って駆動し、これによりレンズ保持部材２４、つまり合焦レンズ群４が光軸方向に移動する。
【００１４】
一方、像振れ補正用の補正レンズ群５は像振れ補正機構３０により駆動される。図３に示すように、像振れ補正機構３０は電磁アクチュエータ５３と検出部５４とを有する。電磁アクチュエータ５３は、光軸に対して垂直方向に着磁されたマグネット３１と、上下板３５Ａ，３５Ｂに嵌め込まれた上下ヨーク３２，３３と、マグネット３１と上側ヨーク３２との間に配置されたコイル３４とを有し、補正レンズ群５を保持するレンズ保持部材３６がコイル３４に連結されている。コイル３４に電流が流れると、フレミングの左手の法則に従って電流方向および磁力線方向と垂直な方向に電磁力が生じ、これに伴ってレンズ保持部材３６、つまり補正レンズ群５が光軸と垂直な方向に移動する。
上記補正レンズ群５の駆動は、交換レンズの振れ量を検出するジャイロ５１（図４）の出力に基づいてなされるが、ジャイロ５１については後述する。
【００１５】
一方、検出部５４は、上板３５Ａに固着されたＬＥＤ３７と、レンズ保持部材３６に結合されたスリット板３８と、下板３５Ｂに設けられたＰＳＤ３９とを有する。ＬＥＤ３７からの光はスリット板３８に形成されたスリットを通過することで光線の幅を絞られ、ＰＳＤ３９に受光される。ＰＳＤ３９はその受光面上の受光位置に応じた信号を出力する。スリット板３８は補正レンズ群５と一体のため、補正レンズ群５の動きがスリットの動きとなり、ＰＳＤ３９の受光面上の光の動きとなる。したがって、ＰＳＤ３９の受光面上の光の位置が補正レンズ群５の位置と等価となり、ＰＳＤ３ａの出力から補正レンズ群５の位置が判明する。
なお、図３では電磁アクチュエータ５３および検出部５４をそれぞれ１つのみ示したが、実際にはＸ，Ｙ方向（互いに直交しかつ光軸と直交する方向）のぞれぞれに対して設けられるものとする。
【００１６】
さらに図３には示されていないが、補正レンズ群５を所定の基準位置（通常は補正レンズ群５の光軸が撮影光学系の光軸と一致する位置）に機械的に固定するロック部５５（図４）が設けられている。ロック部５５は、例えばレンズ保持部材３６の所定位置にピン孔を設けておき、このピン孔に固定ピンを挿抜する機構が用いられる。像振れ補正動作を行わないときにはロックピンを挿通して補正レンズ群５を上記基準位置でロックし、像振れ補正動作の開始に伴ってロックピンを抜いてロックを解除する。
【００１７】
図４は交換レンズに設けられた制御回路のブロック図であり、本発明に関わる部分のみ示している。
ＣＰＵ６１は、カメラボディ側からの指令に応じて超音波モータ駆動制御部４０および像振れ補正装置駆動制御部５０の各制御部４１，５２に指示を出す。また必要に応じてカメラボディ側に信号を出力する。超音波モータ駆動制御部４０は、超音波モータ１０によって合焦レンズ群４を目標位置まで駆動制御するものであり、その制御の詳細を以下に説明する。
【００１８】
制御部４１にはＣＰＵ６１から合焦レンズ群４の目標位置が伝達される。これに応じて制御部４１は発振部４２を作動させ、所定周波数の駆動信号を発生せしめる。発生した駆動信号は位相部４３において位相が９０度異なる２つの駆動信号に分けられ、分けられた２つの駆動信号は増幅部４４Ａ，４４Ｂにてそれぞれ所定の電圧に昇圧される。
【００１９】
昇圧された電圧信号は、超音波モータ１０を構成する圧電体１１ａのＡ相およびＢ相にそれぞれ印加される。Ａ相から発生する９次曲げ振動と、Ｂ相から発生する９次曲げ振動とは位置的な位相が１／４波長ずれるようになっており、また、Ａ相駆動信号とＢ相駆動信号は９０度位相がずれているため、２つの曲げ振動は合成されて９次の進行波となる。進行波の波頭には楕円運動が生じており、振動子１１の駆動面に加圧接触された移動子１２は、楕円運動によって摩擦的に駆動される。
【００２０】
検出部４５は光学式リニアエンコーダ等を含み、移動子１２によって駆動される物体（例えば、ベアリング回転部材１７）の回転に応じたパルス信号を出力する。制御部４２は検出部４５からの検出信号に基づいてレンズ位置情報および速度情報を演算する。例えば所定時間におけるエンコーダパルス数を計測することで速度を求めることができる。この速度情報は移動子１２の回転速度、つまり超音波モータ１０の駆動速度に応じた情報である。制御部は４１は上記位置情報や速度情報に基づいて、合焦レンズ群４が目標位置に位置決めされるように発信部４２の周波数をフィードバック制御する。
【００２１】
次に、像振れ補正機構駆動制御部５０について説明する。
ジャイロ５１は振れセンサを構成し、交換レンズ内の所定位置に設けられる。超音波振動しているジャイロ５１に角速度が加わると、その角速度に応じたコリオリ力が発生し、このコリオリ力を検出することで交換レンズの手振れ等に起因する角速度が得られる。この角速度は制御部１２に入力される。
【００２２】
制御部１２は、ＣＰＵ６１から駆動指令が出されると、ジャイロ５１からの振れ検出量と、上述した検出部５４から入力される補正レンズ５の現在位置とに基づいて電磁アクチュエータ５３を駆動制御し、振れを打ち消す方向に補正レンズ群５をシフトさせる。その結果、手振れに起因する像振れを軽減できる。
【００２３】
本実施形態の交換レンズは、ジャイロ５１と超音波モータ１０といういずれも振動を発する機構を内蔵しているため、両者が同時に駆動された場合に超音波モータ１０の振動がジャイロに伝わり、振動の干渉（うなり）が発生するおそれがある。そして、前述したように振動の干渉は像振れ補正に重大な悪影響を及ぼす。
【００２４】
このような振動の干渉に起因する問題を解決する方法として、ジャイロ５１と超音波モータ１０を同時に駆動しない、換言すれば像振れ補正動作と焦点調節動作とを同時に行わないようにすることが考えられる。しかし、例えば焦点調節において追尾制御を行う場合などには、焦点調節動作と同時に像振れ補正動作を行う利点は大きい。追尾制御とは、被写体の移動に合焦レンズ群４が追従するように、つまり動体であっても合焦状態が維持されるように焦点調節を繰り返し行う制御である。この制御モードでは、撮影者が被写体の移動に伴ってカメラを振ることが多いため像振れが発生し易い。加えてレリーズタイミングが少しでも遅れるとピンぼけの写真になるため、焦点調節後に像振れ補正動作を開始していたのでは間に合わない。したがって、ピンぼけと手振れの双方を防止するには、焦点調節と像振れ補正を同時に行い、レリーズ操作で直ぐに撮影が行えるようにしておく必要がある。また追尾制御でなくとも、焦点調節動作の後に像振れ補正動作を開始するようにすると、同時に行った場合と比べてシャッタレリーズのタイミングが遅れる。そこで、でき得る限り焦点調節と像振れ補正を同時に行えるようにしたい。以下、その方法について説明する。
【００２５】
今、２つの振動
【数１】

を考えた場合、これらを合成すると、
【数２】

となる。振動の振幅がほぼ等しい（ａ１≒ａ２）と仮定した場合、
【数３】

となり、低い周波数成分ｃｏｓ（（ω１−ω２）ｔ／２）がうなりとして表れる。このように、うなりは２つの振動の振幅がほぼ等しく周波数が近い場合に発生するものであり、したがって、２つの振動の周波数を大きく離すか、振幅を変えるかすればうなりは生じないということになる。
【００２６】
図５（ａ）は、本実施形態における超音波モータ１０の曲げ９次モードの振動とジャイロ５１の振動とが干渉する（うなりが生ずる）例を示している。曲げ９次モードは駆動に用いる振動モードである。この場合、ジャイロ５１の振動周波数と超音波モータ１０の振動周波数とを大きく離せば上記干渉は避けられる。しかし、超音波モータでは、駆動に用いる振動モードとは次数の異なる振動モードの振動が発生する場合もあり、図５（ｂ）に示すようにその次数の異なる振動モードの振動とジャイロ５１の振動とが干渉してしまうおそれがある。このため振動の周波数を変える方法は得策ではない。
【００２７】
次に振動の振幅であるが、超音波モータ１０が高速で駆動されているときには、超音波モータ１０からジャイロ５１に伝達される振動振幅は大きく、ジャイロ自身の振動振幅と一致する可能性があり、振動の干渉が起こる可能性は高い。しかし、超音波モータ１０が比較的低速で駆動されているときには、ジャイロ５１に伝達される振動振幅はジャイロ５１の振動振幅よりも小さく、振動の干渉は生じない。そして、超音波モータ１０は、焦点調節の際に常に高速で駆動されているわけではない。
【００２８】
そこで本実施形態では、焦点調節時における超音波モータ１０の速度を逐次判定し、所定速度Ｖｕ以上であれば補正レンズ群５の駆動を禁止するが、所定速度Ｖｕ未満であれば補正レンズ群５の駆動を許容するようにした。この場合、閾値である所定速度Ｖｕは、ジャイロ５１の発振周波数や使用する超音波モータ１０の特性、特に超音波モータ１０の速度と振幅の関係や、撮影光学系の特性（焦点距離など）、鏡筒構成部材の材質（振動伝達率）等を加味して決定される。要は上記振動干渉が起こるか起こらないかの境界値に設定すればよいが、大事をとって境界値よりも若干遅い速度としてもよい。これによれば、上記振動の干渉が起こり得る場合は補正レンズ群５の駆動は確実に禁止されるので、干渉に起因する不具合が防止される。また干渉が起こり得ないときには焦点調節途中であっても補正レンズ群５の駆動が並行して行われるので、レリーズタイミングを遅らせることなく像振れのない写真が得られる。
【００２９】
さらに、上述した追尾動作時に像振れ補正動作を同時に行うことを考慮すれば、追尾時における超音波モータ１０の駆動速度の上限値を上記所定速度Ｖｕに制限すればよい。これによれば、追尾動作時には上記振動の干渉は発生しないから、焦点調節途中であっても補正レンズ群５の駆動を並行して行うことができる。
【００３０】
図６のフローチャートも参照して本実施形態の動作をより具体的に説明する。なお、交換レンズは既にカメラボディ（不図示）に装着されているものとする。
例えばカメラボディにてレリーズボタンの半押し操作がなされると、ボディ側のＣＰＵからレンズ側のＣＰＵ６１に合焦指令と防振指令が伝達される。また合焦レンズ群４の現時点の位置と目標位置との差に関する情報も伝達される。この差に関する情報は、ボディ側に設けられた焦点検出装置の出力に基づいてボディ側ＣＰＵが演算したものである。レンズ側ＣＰＵ６１は、超音波モータ１０の制御部４１に上記差の情報を伝え、制御部４１はその差に基づいて超音波モータ１０の駆動制御を開始する。
【００３１】
一方、ＣＰＵ６１は、上記防振指令を受けて像振れ補正機構３０の制御部５２に補正レンズ駆動指令を伝達する。制御部５２は、この補正レンズ駆動指令を受けて図６に示す処理を開始する（ステップＳ１）。
【００３２】
図６において、超音波モータ駆動制御部４０の制御部４１は、検出部４５の検出結果によって演算された超音波モータ１０の駆動速度をＣＰＵ６１に入力し、ＣＰＵ６１はその速度情報を制御部５２に送る。制御部５２は、入力された駆動速度Ｖと予め決められた所定速度Ｖｕとを比較する（ステップＳ２）。ここで、所定速度Ｖｕの決定方法は上述したとおりである。
【００３３】
Ｖ＜Ｖｕ、つまり超音波モータ１０の駆動速度Ｖが所定値Ｖｕ未満であれば、上記振動の干渉は発生しないと判断し、ジャイロ５１にて検出された振れ量情報（角速度）を像振れ補正用の角速度として設定する（ステップＳ３）。一方、Ｖ≧Ｖｕ、つまり駆動速度Ｖが所定値Ｖｕ以上であれば、振動の完了が発生する可能性があると判断し、像振れ補正用の角速度を強制的に０とする（ステップＳ７）。
【００３４】
次いで検出部５４から補正レンズ群５の現在の位置を入力し（ステップＳ４）、上記ステップＳ３あるいはＳ７で設定された角速度およびステップＳ４で入力した位置情報とに基づいて補正レンズ群５の駆動量を演算し、その演算結果に基づいて電磁アクチュエータ５３を作動せしめる（ステップＳ５）。これにより像振れ補正動作が行われる。ただし、補正レンズ群５が実際に駆動されるのは駆動速度Ｖが所定値Ｖｕ未満のときのみである。すなわち、駆動速度Ｖが所定値Ｖｕ以上のときには、ステップＳ７で角速度が強制的に０とされるので、演算される補正レンズ駆動量は０であり、補正レンズ群５は基準位置に留まったままである。また補正レンズ群５が基準位置以外にあった場合には、基準位置に駆動された後にその位置に保持される。つまり補正レンズ５の駆動が実質的に禁止される。
【００３５】
ステップＳ５の後、上述した防振指令が継続してなされているか否かを判定する（ステップＳ６）。例えば撮影完了あるいは撮影中止によって半押し操作が解除された場合には、防振指令が断たれるのでステップＳ６が否定され、像振れ補正動作を停止する（ステップＳ８）。一方、半押し操作が継続しているときにはステップＳ２に戻り、上述の処理を繰り返す。
【００３６】
以上の実施形態において、合焦レンズ群４が焦点調節光学系を、補正レンズ群５が補正光学系を、超音波モータ１０が振動波モータを、ジャイロ５１が像振れ検出装置を、像振れ補正機構３０および像振れ補正機構駆動制御部５０が補正駆動装置を、検出部４５が速度検出装置を、ＣＰＵ６１が制御手段をそれぞれ構成する。
【００３７】
図６の処理では、振れ補正制御に用いる角速度を強制的に０にすることで補正レンズ群５の駆動を禁止したが、例えば図７に示すように、電磁アクチュエータ５３を非作動状態にすることで補正レンズ群５の駆動を禁止するようにしてもよい。すなわち、ステップＳ２で駆動速度Ｖが所定値Ｖｕ以上と判定された場合には、ステップＳ１１で電磁アクチュエータ５３への駆動信号を断って像振れ補正動作を停止し、上記ステップＳ３〜Ｓ５をスキップしてステップＳ６に進む。なおステップＳ１１では、補正レンズ群５が基準位置にない場合に限ってこれを基準位置に駆動する動作を行う。それ以降は補正レンズ群５が基準位置に保持される。
このように電磁アクチュエータ５３を非作動状態にして補正レンズ群５の駆動を禁止するようにすれば、電磁アクチュエータ５３を作動させながら駆動禁止する場合（図６）と比べて省電力が図れる。
【００３８】
また図８に示すように、ロック部５５を用いて補正レンズ群５の駆動を禁止するようにしてもよい。すなわち、ステップＳ２で駆動速度Ｖが所定値Ｖｕ以上と判定された場合には、ステップＳ２１でロック部５５により機械的に補正レンズ群５を基準位置に固定し、上記ステップＳ３〜Ｓ５をスキップしてステップＳ６に進む。ロック後は電磁アクチュエータ５３への駆動信号を解除することが望ましいが、解除しなくてもよい。
【００３９】
−第２の実施形態−
図９により本発明の第２の実施形態を説明する。なお、ハードウェアの構成は実質的に先の実施形態と同一であるものとする。また図９において、図６と同様のステップには同一のステップ番号を付す。
【００４０】
先の実施形態では、超音波モータ１０の駆動速度に応じて補正レンズ群５の駆動を許容／禁止するようにしたが、本実施形態では追尾動作の有無により補正レンズ群５の駆動を許容／禁止する。追尾動作とは、上述したように合焦レンズ群４が被写体の移動に追従するように焦点調節を繰り返し行う動作である。この追尾動作を行う追尾モードは、撮影者が手動で設定するものであってもよいし、被写体が動体と判定したときにカメラが自動設定するものでもよい。一般に追尾モードにおける超音波モータの駆動速度は通常モードと比べて遅いが、本実施形態では、追尾時における超音波モータ１０の速度の上限値が上述した所定速度Ｖｕで制限されるものとする。
【００４１】
図９において、ＣＰＵ６１は、カメラボディから合焦指令，防振指令，レンズ位置情報等に加えて、追尾モードの設定の有無の情報も受け取る。ステップ３１では、超音波モータ１０が駆動されているか否か、つまり焦点調節動作が行われているか否かを判定する。超音波モータ１０が駆動されていなければステップ３〜Ｓ５の像振れ補正動作を行い、駆動されている場合にはステップ３２に進む。ステップ３２では追尾モードが設定されているか否かを判定し、設定されていればステップ３に進む。一方、追尾モードが設定されていなければステップ１１で電磁アクチュエータ５３への駆動信号を断って像振れ補正動作を停止する。
【００４２】
このように追尾動作が行われているときには像振れ補正動作が許容されるので、撮影応答性を犠牲にすることなく像振れおよびピンぼけのない写真が撮影できる。追尾動作時のモータ駆動速度の上限値は上記所定速度Ｖｕ未満であるから、超音波モータ１０とジャイロ５１の振動が干渉せず、補正光学系が誤動作することはない。一方、追尾動作を行っていないときには振動波モータ１０の駆動時に像振れ補正動作が全面的に禁止されるので、振動干渉による補正レンズ群５の誤動作は起こり得ない。
【００４３】
図１０は追尾動作の有無と超音波モータ１０の駆動速度の双方を加味して像振れ補正動作を許容／禁止するようにした例を示す。ここでは追尾動作時のモータ駆動速度の上限値が上記所定速度Ｖｕに一致するものとする。
【００４４】
図１０において、ステップ３２で追尾モードと判定されると、ステップ４１で超音波モータ１０の駆動速度Ｖが上記所定値Ｖｕ以上か否かを判定する。所定値Ｖｕ未満であればステップ３以下の像振れ補正動作を行い、所定値Ｖｕ以上であればステップ１１で電磁アクチュエータ５３への駆動信号を断ち、像振れ補正動作を停止する。
【００４５】
一方、追尾モードでない場合には、ステップ４２で超音波モータ１０の駆動速度Ｖが所定値Ｖａ以上か否かを判定する。ここで、超音波モータ１０が高速で動いているとき、つまり焦点調節が高速で行われているときには、像振れ補正動作が行われているか否かをファインダ画面で確認するのは難しい。Ｖａは、像振れ補正動作の有無を確認できるか否かの境界速度程度であり、上記Ｖｕよりも小さな（低速の）値とされる。駆動速度Ｖが所定値Ｖａ未満であればステップ３以下の像振れ補正動作を行い、所定値Ｖａ以上であれば、つまり像振れ補正動作が行われているか否かをファインダ画面で確認できないようなときには、ステップ１１で電磁アクチュエータ５３への駆動信号を断ち、像振れ補正動作を停止する。
【００４６】
以上では、超音波モータとジャイロ振動の干渉について説明したが、例えば焦点調節と像振れ補正とを別々の超音波モータで行うことが考えられる。この場合も超音波モータの振動同士が干渉して上述と同様の問題が起こり得るので、本発明を適用できる。
【００４７】
なお、超音波モータの速度検出は実施形態に限定されず、例えば発振部の周波数から検出することもできる。また手振れ検出手段としてジャイロを用いたが、振動を発することでその振動を検出できるものであればジャイロ以外のセンサでもよい。さらに上述した実施形態では、９波の進行波が発生する超音波モータを用いたが、他の波数の超音波モータでもよい。また、超音波モータ以外の振動波モータを用いてもよい。例えば第１次モード振動とねじり２次振動を利用したモード縮退型振動子でもよい。
【００４８】
像振れ補正機構の構成も図３のものに限定されず、電磁アクチュエータ以外のアクチュエータ（例えば、ＤＣモータ）を用いて振れ補正レンズを駆動するものでもよい。またカメラの交換レンズにて説明したが、例えばレンズ一体型のスチルカメラやビデオカメラ等、振動波モータと像振れ補正機構を備えた他の光学機器にも本発明を適用できる。
【００４９】
【発明の効果】
請求項１，９の発明によれば、振動波モータの駆動速度に関する情報に基づいて像振れ補正装置による補正光学系の駆動を許容／禁止するようにしたので、振動の干渉が発生し得る場合に補正光学系の駆動を禁止するようにでき、振動の干渉による補正光学系の誤動作を回避できる。一方、振動の干渉のおそれがないときには、像振れ補正動作を行うことで像振れのない写真が得られる。
請求項４，１１の発明によれば、焦点調節光学系が被写体の移動に追従するように焦点調節を繰り返し行う追尾モードが設定されている場合には、振動波モータの駆動時に補正駆動装置による補正光学系の駆動を許容し、追尾モードが設定されていない場合には、振動波モータの駆動時に補正光学系の駆動を禁止するようにしたので、追尾を行いながら像振れ補正動作をも行え、撮影応答性を犠牲にすることなく像振れおよびピンぼけのない写真が撮影できる。追尾モード時のモータ駆動速度は遅いので、振動波モータおよび像振れ検出装置の振動が干渉せず、補正光学系が誤動作することはない。一方、追尾モードでないときには振動波モータの駆動時に補正光学系の駆動が禁止されるので、補正光学系の誤動作は起こり得ない。
【図面の簡単な説明】
【図１】本発明の実施形態に係る交換レンズの断面図。
【図２】超音波モータの構成を示す断面図。
【図３】像振れ補正機構の構成を示す断面図。
【図４】交換レンズの制御系を示すブロック図であり、像振れ補正および超音波モータ駆動に関わる部分を示す。
【図５】超音波モータの振動とジャイロの振動との干渉を説明する図。
【図６】第１の実施形態の動作を説明するフローチャート。
【図７】他の実施形態の動作を説明するフローチャート。
【図８】他の実施形態の動作を説明するフローチャート。
【図９】第２の実施形態の動作を説明するフローチャート。
【図１０】他の実施形態の動作を説明するフローチャート。
【符号の説明】
３固定レンズ群
４合焦レンズ群
５補正レンズ群
１０超音波モータ
３０像振れ補正機構
４０超音波モータ駆動制御部
４１，５２制御部
５０像振れ補正装置駆動制御部
５１ジャイロ
５３電磁アクチュエータ
５４検出部
６１ＣＰＵ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical device having a built-in vibration wave motor and capable of correcting image blur and an interchangeable lens for a camera.
[0002]
[Prior art]
A vibration wave motor typified by an ultrasonic motor generates a traveling wave on a driving surface of an elastic body by utilizing expansion and contraction of a piezoelectric body, and drives a moving element by the traveling wave (for example, Patent Document 1). ). Since this type of vibration wave motor generates a high torque even at a low rotation, the gear between the motor and the driven member can be omitted. Therefore, when the vibration wave motor is mounted on the interchangeable lens of the camera as a focus adjustment drive source, a quiet focus adjustment operation without gear noise can be realized. Further, since the responsiveness is good, there is an advantage that the focusing lens positioning accuracy is high.
[0003]
On the other hand, as an image blur correction device for a camera, for example, one disclosed in Patent Document 2 is known. This device detects the angular velocity of the camera caused by camera shake using a gyro, and drives the correction lens in a direction perpendicular to the optical axis based on this angular velocity, thereby reducing image blur on the imaging plane. to correct. According to this, image blur due to camera shake can be suppressed to a minimum even when the shutter speed is low, such as when the object scene is dark or when the aperture is narrowed down.
[0004]
[Patent Document 1]
Japanese Patent Publication No. 1-17354
[Patent Document 2]
JP-A-8-6089
[Patent Document 3]
JP-A-7-270879
[0005]
[Problems to be solved by the invention]
Consider an interchangeable lens equipped with both the image blur correction device and the vibration wave motor. The shake detection gyro obtains an angular velocity by utilizing the Coriolis effect by ultrasonic vibration itself. When the gyro and the vibration wave motor are driven at the same time (when the image blur correction operation and the focus adjustment operation are performed simultaneously), the ultrasonic vibration of the vibration wave motor is applied to the gyro, and vibration interference may occur. In other words, the vibration of the difference between the oscillation frequency of the gyro and the oscillation frequency of the vibration wave motor may occur as a beat, and the beat vibration may be erroneously detected as a vibration due to hand shake. If image blur correction is performed based on the erroneous detection result, a satisfactory image blur correction effect cannot be obtained, and conversely, image blur may be promoted.
[0006]
For example, Patent Document 3 discloses a device that is devised so that vibration of a vibration wave motor (ultrasonic motor) is not transmitted to a detection unit of an image shake correction apparatus. This is designed so that the lens component does not resonate with the vibration wave motor, or the vibration is attenuated by using a buffer material. However, since the ultrasonic vibration has a high frequency, the vibration energy is large for the amplitude, and it is difficult to attenuate it to a level that is not erroneously detected by the gyro. Further, the vibration of the ultrasonic motor is radiated into the air, and this may be detected by the gyro, which cannot be prevented by a cushioning material or the like.
[0007]
An object of the present invention is to provide an optical apparatus and an interchangeable lens for a camera that can perform image blur correction that can eliminate problems due to vibration interference between the vibration wave motor and the image blur correction apparatus without preventing vibration transmission from the vibration wave motor. There is.
[0008]
[Means for Solving the Problems]
The invention according to claim 1 is based on a correction optical system that is driven to correct image shake on the image plane, an image shake detection device that detects shake amount information according to vibration of the optical device, and the shake amount information. The present invention is applied to an optical apparatus capable of image blur correction, which includes a correction driving device that drives a correction optical system and a vibration wave motor.
And a speed detection device for detecting information related to the driving speed of the vibration wave motor, and a control means for permitting / prohibiting driving of the correction optical system by the correction drive device based on the detection result of the speed detection device. The means allows the correction optical system to be driven by the correction drive device when the speed of the vibration wave motor is less than a predetermined speed at which the vibration of the vibration wave motor and the vibration generated by the image shake detection device do not interfere with each other. The driving of the correction optical system by the correction driving device is prohibited when the speed is equal to or higher than a predetermined speed.
An optical apparatus capable of image blur correction according to claim 2 includes: a focus adjustment optical system driven for focus adjustment; and an optical system including a correction optical system driven to correct image shake in an image plane; , A vibration wave motor that drives the focus adjustment optical system, an image shake detection device that detects vibration amount information corresponding to the vibration of the optical device by itself, and a correction optical system based on the shake amount information When the tracking mode in which the focus adjustment is repeatedly performed so that the focus adjustment optical system follows the movement of the subject is set in the optical device including the correction drive device, the correction drive device is driven when the vibration wave motor is driven. The correction optical system is allowed to be driven by the control unit, and the upper limit of the driving speed of the vibration wave motor is limited to a predetermined speed at which the vibration of the vibration wave motor and the vibration generated by the image shake detection device do not interfere with each other. Mode when not set, characterized by comprising a control means for prohibiting the driving of the correction optical system according to the corrective driver when driving the vibration wave motor.
An optical apparatus capable of image shake correction according to claim 6 includes: a focus adjustment optical system driven for focus adjustment; and an optical system including a correction optical system driven to correct image shake in an image plane; , A vibration wave motor that drives the focus adjustment optical system, an image shake detection device that detects vibration amount information corresponding to the vibration of the optical device by itself, and a correction optical system based on the shake amount information In an optical device having a correction drive device that performs a setting, a speed detection device that detects information related to the drive speed of the vibration wave motor and a tracking mode that repeatedly performs focus adjustment so that the focus adjustment optical system follows the movement of the subject And a control means for permitting / prohibiting driving of the correction optical system by the correction drive device based on the detection result of the speed detection device, and the control means when the tracking mode is set The drive speed of the vibration wave motor Degree , A predetermined speed at which the vibration of the vibration wave motor and the vibration generated by the image shake detection device do not interfere with each other Less than Allow corrective optical system to be driven by corrective drive when However, when the driving speed of the vibration wave motor is equal to or higher than the predetermined speed, driving of the correction optical system by the correction driving device is prohibited. It is characterized by doing.
The interchangeable lens for a camera capable of correcting image blur according to claim 7 includes a correction optical system that is driven to correct image blur on the image plane, and image blur that detects shake amount information corresponding to the vibration of the interchangeable lens. A detection device, a correction drive device that drives a correction optical system based on shake amount information, and a speed detection device that detects information related to the drive speed of the vibration wave motor in an interchangeable lens for a camera including the vibration wave motor; Control means for permitting / prohibiting driving of the correction optical system by the correction drive device based on the detection result of the speed detection device, and the control means determines the speed of the vibration wave motor and the vibration of the vibration wave motor. The correction optical system is allowed to drive the correction optical system when the speed is less than a predetermined speed at which there is no possibility of interference with vibration generated by the shake detection apparatus.
The interchangeable lens for a camera capable of image blur correction according to claim 8 includes a focus adjustment optical system that is driven for focus adjustment, and a correction optical system that is driven to correct image shake in the image plane. An optical system, a vibration wave motor that drives the focus adjustment optical system, an image shake detection device that detects vibration amount information corresponding to the vibration of the optical device by itself, and correction optics based on the shake amount information In an interchangeable lens for a camera equipped with a correction drive device that drives the system, when a tracking mode in which focus adjustment is repeatedly performed so that the focus adjustment optical system follows the movement of the subject is set, While driving the correction optical system by the correction drive device during driving, the upper limit of the driving speed of the vibration wave motor may interfere with the vibration of the vibration wave motor and the vibration generated by the image shake detection device. There was limited to a predetermined speed, when the tracking mode is not set, characterized by comprising a control means for inhibiting driving of said correction optical system according to the corrective driver when driving the vibration wave motor.
The interchangeable lens for a camera capable of image blur correction according to claim 9 includes a focus adjustment optical system that is driven for focus adjustment, and a correction optical system that is driven to correct image shake in an image plane. An optical system, an image shake detection device that detects vibration amount information according to vibration of the interchangeable lens by itself, a correction drive device that drives a correction optical system based on the shake amount information, and focus adjustment optics In a camera interchangeable lens equipped with a vibration wave motor that drives the system, a speed detection device that detects information related to the drive speed of the vibration wave motor and focus adjustment so that the focus adjustment optical system follows the movement of the subject. Control means for permitting / prohibiting driving of the correction optical system by the correction drive device based on the presence / absence of setting of the tracking mode to be performed and the detection result of the speed detection device. If the mode is set, the driving speed of the vibration wave motor Degree , A predetermined speed at which the vibration of the vibration wave motor and the vibration generated by the image shake detection device do not interfere with each other Less than Allow corrective optical system to be driven by corrective drive when However, when the driving speed of the vibration wave motor is equal to or higher than the predetermined speed, driving of the correction optical system by the correction driving device is prohibited. It is characterized by doing.
According to a tenth aspect of the present invention, there is provided a method of using an optical device that detects shake amount information corresponding to vibrations of the optical device using an image shake detection device, and corrects image shake on an image plane of the optical device based on the shake amount information. The optical component is driven to detect information on the speed of the vibration wave motor used in the optical device, and the vibration of the vibration wave motor interferes with the vibration of the vibration wave motor and the vibration generated by the image shake detection device. It is less than the predetermined speed without fear Sometimes driving optical components Acceptable The speed of the vibration wave motor is controlled to It is more than a predetermined speed Sometimes driving optical components Ban It controls to do.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
-First embodiment-
A first embodiment when the present invention is applied to an interchangeable lens of a camera will be described with reference to FIGS.
FIG. 1 is a cross-sectional view of an interchangeable lens in the present embodiment. A fixed cylinder 2 is connected to the outer cylinder 1, and a fixed lens group 3 is held on the inner peripheral surface side of the fixed cylinder 2. A focusing lens group 4 for focus adjustment is disposed at the rear of the fixed lens group 3, and a correction lens group 5 for shake correction is disposed at the rear thereof. These lens groups 3 to 5 constitute a photographing optical system. The interchangeable lens is attached to a camera body (not shown) via a bayonet claw portion 6.
[0010]
Hereinafter, the focus adjustment by the focusing lens group 4 and the shake correction by the correction lens group 5 will be described in detail.
The focusing lens group 4 uses an ultrasonic motor 10 provided in the interchangeable lens as a drive source. As shown in FIG. 2, the ultrasonic motor 10 includes a vibrator 11 and a moving element 12. The vibrator 11 is an electro-mechanical conversion element (hereinafter referred to as a piezoelectric body) composed of a piezoelectric element or an electrostrictive element. 11a and an elastic body 11b to which the piezoelectric body 11a is joined. The elastic body 11b is made of an annular metal material having a high resonance sharpness, and a plurality of radial grooves are formed on the surface opposite to the surface to which the piezoelectric body 11a is bonded. The tip surface of the portion between the grooves (protrusion portion) is brought into pressure contact with the moving element 12 as a driving surface. The groove is formed in order to amplify the amplitude of the traveling wave by bringing the neutral surface of the traveling wave as close to the piezoelectric body 11a as possible.
[0011]
The piezoelectric body 11a is divided into two phases (A phase and B phase) along the circumferential direction. In each phase, elements alternately polarized every ½ wavelength are arranged. An interval of 1/4 wavelength is left between the phases. A pressure plate 14 is disposed on the lower surface of the piezoelectric body 11a with the nonwoven fabric 13 interposed therebetween, and a pressure member 15 is disposed therebelow. The pressurizing member 15 is made of, for example, a disc spring, and the pressurizing force brings the vibrator 11 into pressure contact with the moving element 12 via the pressurizing plate 14 and the nonwoven fabric 13. The nonwoven fabric 13 is for suppressing the vibration of the vibrator 11 from being transmitted to the pressure plate 14 and the pressure member 15, and is made of felt, for example. The pressing member 15 is not limited to a disc spring, and may be a coil spring or a wave spring.
[0012]
The mover 12 is made of a light metal such as annular aluminum, and the lower sliding surface is subjected to a surface treatment for improving wear resistance. A vibration absorbing member (for example, rubber) 16 is disposed on the upper part of the moving element 12 to absorb vibrations in the vertical direction of the moving element 12, and a bearing rotating member 17 is disposed on the upper part.
[0013]
As shown in FIG. 1, the bearing rotating member 17 is rotatably supported by a bearing fixing member 22 via a bearing ball 21, and a cam ring 23 is integrally connected to the peripheral surface of the bearing rotating member 17. . Therefore, when the movable element 12 rotates, the bearing rotating member 17 and the cam ring 23 rotate together, and the focusing lens group 4 is driven to focus as the cam ring 23 rotates. That is, a cam pin 24 a is projected from the lens holding member 24 that holds the focusing lens group 4, and the cam pin 24 a passes through the rectilinear groove 2 a in the optical axis direction of the fixed cylinder 2 and engages with the cam groove 23 a of the cam ring 23. Are combined. When the cam ring 23 rotates, the cam groove 23a drives the cam pin 24a along the rectilinear groove 2a, whereby the lens holding member 24, that is, the focusing lens group 4 moves in the optical axis direction.
[0014]
On the other hand, the correction lens group 5 for image blur correction is driven by the image blur correction mechanism 30. As shown in FIG. 3, the image blur correction mechanism 30 includes an electromagnetic actuator 53 and a detection unit 54. The electromagnetic actuator 53 is disposed between the magnet 31 magnetized in the direction perpendicular to the optical axis, the upper and

lower yokes

32 and 33 fitted in the upper and

lower plates

35A and 35B, and the magnet 31 and the upper yoke 32. A lens holding member 36 having a coil 34 and holding the correction lens group 5 is connected to the coil 34. When a current flows through the coil 34, an electromagnetic force is generated in a direction perpendicular to the current direction and the direction of the line of magnetic force in accordance with Fleming's left-hand rule. Along with this, the lens holding member 36, that is, the correction lens group 5 is perpendicular to the optical axis. Move to.
The correction lens group 5 is driven based on the output of the gyro 51 (FIG. 4) that detects the shake amount of the interchangeable lens. The gyro 51 will be described later.
[0015]
On the other hand, the detection unit 54 includes an LED 37 fixed to the upper plate 35A, a slit plate 38 coupled to the lens holding member 36, and a PSD 39 provided on the lower plate 35B. The light from the LED 37 passes through a slit formed in the slit plate 38 to reduce the width of the light beam and is received by the PSD 39. The PSD 39 outputs a signal corresponding to the light receiving position on the light receiving surface. Since the slit plate 38 is integrated with the correction lens group 5, the movement of the correction lens group 5 becomes the movement of the slit, and the movement of the light on the light receiving surface of the PSD 39. Therefore, the position of the light on the light receiving surface of the PSD 39 is equivalent to the position of the correction lens group 5, and the position of the correction lens group 5 is determined from the output of the PSD 3a.
In FIG. 3, only one electromagnetic actuator 53 and one detection unit 54 are shown, but in actuality, they are provided for each of the X and Y directions (directions orthogonal to each other and orthogonal to the optical axis). Shall.
[0016]
Further, although not shown in FIG. 3, a lock unit that mechanically fixes the correction lens group 5 at a predetermined reference position (usually a position where the optical axis of the correction lens group 5 coincides with the optical axis of the photographing optical system). 55 (FIG. 4) is provided. For the lock portion 55, for example, a pin hole is provided at a predetermined position of the lens holding member 36, and a mechanism for inserting and removing a fixed pin into the pin hole is used. When the image blur correction operation is not performed, the lock pin is inserted to lock the correction lens group 5 at the reference position, and the lock pin is removed and the lock is released with the start of the image blur correction operation.
[0017]
FIG. 4 is a block diagram of a control circuit provided in the interchangeable lens, and shows only the part related to the present invention.
The CPU 61 issues instructions to the

control units

41 and 52 of the ultrasonic motor drive control unit 40 and the image blur correction device drive control unit 50 in response to a command from the camera body side. Also outputs a signal to the camera body as required. The ultrasonic motor drive control unit 40 controls the driving of the focusing lens group 4 to the target position by the ultrasonic motor 10, and details of the control will be described below.
[0018]
The target position of the focusing lens group 4 is transmitted from the CPU 61 to the control unit 41. In response to this, the control unit 41 operates the oscillation unit 42 to generate a drive signal having a predetermined frequency. The generated drive signal is divided into two drive signals having a phase difference of 90 degrees in the phase unit 43, and the two divided drive signals are boosted to predetermined voltages by the

amplification units

44A and 44B, respectively.
[0019]
The boosted voltage signal is applied to the A phase and the B phase of the piezoelectric body 11a constituting the ultrasonic motor 10, respectively. The positional difference between the 9th order bending vibration generated from the A phase and the 9th order bending vibration generated from the B phase is ¼ wavelength, and the A phase drive signal and the B phase drive signal are Since the phase is shifted by 90 degrees, the two bending vibrations are combined into a ninth-order traveling wave. An elliptical motion is generated at the wavefront of the traveling wave, and the movable element 12 in pressure contact with the driving surface of the vibrator 11 is frictionally driven by the elliptical motion.
[0020]
The detection unit 45 includes an optical linear encoder and the like, and outputs a pulse signal corresponding to the rotation of an object (for example, the bearing rotating member 17) driven by the moving element 12. The control unit 42 calculates lens position information and speed information based on the detection signal from the detection unit 45. For example, the speed can be obtained by measuring the number of encoder pulses in a predetermined time. This speed information is information corresponding to the rotational speed of the moving element 12, that is, the driving speed of the ultrasonic motor 10. Based on the position information and speed information, the control unit 41 feedback-controls the frequency of the transmission unit 42 so that the focusing lens group 4 is positioned at the target position.
[0021]
Next, the image blur correction mechanism drive control unit 50 will be described.
The gyro 51 constitutes a shake sensor and is provided at a predetermined position in the interchangeable lens. When an angular velocity is applied to the ultrasonically vibrating gyro 51, a Coriolis force corresponding to the angular velocity is generated. By detecting this Coriolis force, an angular velocity resulting from hand shake or the like of the interchangeable lens can be obtained. This angular velocity is input to the control unit 12.
[0022]
When a drive command is issued from the CPU 61, the control unit 12 drives and controls the electromagnetic actuator 53 based on the shake detection amount from the gyro 51 and the current position of the correction lens 5 input from the detection unit 54 described above. The correction lens group 5 is shifted in a direction to cancel out the shake. As a result, image blur due to camera shake can be reduced.
[0023]
Since the interchangeable lens of this embodiment has a built-in mechanism for generating vibration, both the gyro 51 and the ultrasonic motor 10, when both are driven simultaneously, the vibration of the ultrasonic motor 10 is transmitted to the gyro, and the vibration is reduced. There is a risk of interference. As described above, vibration interference has a serious adverse effect on image blur correction.
[0024]
As a method for solving such a problem caused by vibration interference, it is considered that the gyro 51 and the ultrasonic motor 10 are not driven simultaneously, in other words, the image blur correction operation and the focus adjustment operation are not performed simultaneously. It is done. However, for example, when tracking control is performed in the focus adjustment, the advantage of performing the image blur correction operation simultaneously with the focus adjustment operation is great. The tracking control is control in which focus adjustment is repeatedly performed so that the focusing lens group 4 follows the movement of the subject, that is, the focused state is maintained even if the object is a moving object. In this control mode, since the photographer often shakes the camera as the subject moves, image blur tends to occur. In addition, if the release timing is delayed a little, the photograph will be out of focus, so it would be too late to start the image blur correction operation after the focus adjustment. Therefore, in order to prevent both out-of-focus and camera shake, it is necessary to perform focus adjustment and image shake correction at the same time so that shooting can be performed immediately by a release operation. Even if tracking control is not performed, if the image blur correction operation is started after the focus adjustment operation, the shutter release timing is delayed as compared with the case where the image blur correction operation is performed simultaneously. Therefore, we want to be able to perform focus adjustment and image blur correction at the same time as much as possible. The method will be described below.
[0025]
Now two vibrations
[Expression 1]

When combining these,
[Expression 2]

It becomes. Assuming that the amplitude of vibration is almost equal (a1≈a2),
[Equation 3]

Thus, a low frequency component cos ((ω1-ω2) t / 2) appears as a beat. In this way, the beat is generated when the amplitudes of the two vibrations are approximately equal and close to each other in frequency, and therefore, no beat is generated if the frequencies of the two vibrations are greatly separated or the amplitude is changed. .
[0026]
FIG. 5A shows an example in which the vibration of the bending 9th-order mode of the ultrasonic motor 10 and the vibration of the gyro 51 in this embodiment interfere with each other. The bending ninth mode is a vibration mode used for driving. In this case, the interference can be avoided if the vibration frequency of the gyro 51 and the vibration frequency of the ultrasonic motor 10 are greatly separated. However, in the ultrasonic motor, there is a case where vibration of a vibration mode having a different order from the vibration mode used for driving occurs, and vibration of a vibration mode having a different order and vibration of the gyro 51 as shown in FIG. May interfere. For this reason, changing the frequency of vibration is not a good idea.
[0027]
Next, regarding the amplitude of vibration, when the ultrasonic motor 10 is driven at high speed, the vibration amplitude transmitted from the ultrasonic motor 10 to the gyro 51 is large and may coincide with the vibration amplitude of the gyro itself. The possibility of vibration interference is high. However, when the ultrasonic motor 10 is driven at a relatively low speed, the vibration amplitude transmitted to the gyro 51 is smaller than the vibration amplitude of the gyro 51 and no vibration interference occurs. The ultrasonic motor 10 is not always driven at high speed during focus adjustment.
[0028]
Therefore, in this embodiment, the speed of the ultrasonic motor 10 at the time of focus adjustment is sequentially determined. If the speed is equal to or higher than the predetermined speed Vu, the driving of the correction lens group 5 is prohibited. Was allowed to drive. In this case, the predetermined speed Vu, which is a threshold value, indicates the oscillation frequency of the gyro 51, the characteristics of the ultrasonic motor 10 to be used, particularly the relationship between the speed and amplitude of the ultrasonic motor 10, the characteristics of the imaging optical system (focal length, etc.), It is determined in consideration of the material (vibration transmission rate) of the lens barrel component. In short, it may be set to a boundary value indicating whether or not the vibration interference occurs, but it may be set to a speed slightly slower than the boundary value. According to this, when the vibration interference can occur, the driving of the correction lens group 5 is surely prohibited, so that a problem caused by the interference is prevented. When no interference can occur, the correction lens group 5 is driven in parallel even during the focus adjustment, so that a photograph free from image blur can be obtained without delaying the release timing.
[0029]
Furthermore, considering that the image blur correction operation is performed simultaneously during the tracking operation described above, the upper limit value of the driving speed of the ultrasonic motor 10 during tracking may be limited to the predetermined speed Vu. According to this, since the vibration interference does not occur during the tracking operation, the correction lens group 5 can be driven in parallel even during the focus adjustment.
[0030]
The operation of this embodiment will be described more specifically with reference to the flowchart of FIG. It is assumed that the interchangeable lens is already attached to the camera body (not shown).
For example, when the release button is half-pressed on the camera body, a focusing command and an image stabilization command are transmitted from the CPU on the body side to the CPU 61 on the lens side. Information about the difference between the current position of the focusing lens group 4 and the target position is also transmitted. Information on this difference is calculated by the body side CPU based on the output of the focus detection device provided on the body side. The lens side CPU 61 transmits the difference information to the control unit 41 of the ultrasonic motor 10, and the control unit 41 starts driving control of the ultrasonic motor 10 based on the difference.
[0031]
On the other hand, the CPU 61 receives the image stabilization command and transmits a correction lens drive command to the control unit 52 of the image blur correction mechanism 30. The control unit 52 receives the correction lens drive command and starts the process shown in FIG. 6 (step S1).
[0032]
In FIG. 6, the control unit 41 of the ultrasonic motor drive control unit 40 inputs the drive speed of the ultrasonic motor 10 calculated based on the detection result of the detection unit 45 to the CPU 61, and the CPU 61 sends the speed information to the control unit 52. send. The controller 52 compares the input driving speed V with a predetermined speed Vu that is determined in advance (step S2). Here, the method for determining the predetermined speed Vu is as described above.
[0033]
If V <Vu, that is, if the driving speed V of the ultrasonic motor 10 is less than the predetermined value Vu, it is determined that the vibration interference does not occur, and the shake amount information (angular velocity) detected by the gyro 51 is corrected for image blur. Is set as the angular velocity for use (step S3). On the other hand, if V ≧ Vu, that is, if the driving speed V is equal to or higher than the predetermined value Vu, it is determined that the vibration may be completed, and the angular velocity for image blur correction is forcibly set to 0 (step S7). .
[0034]
Next, the current position of the correction lens group 5 is input from the detection unit 54 (step S4), and the driving amount of the correction lens group 5 is based on the angular velocity set in step S3 or S7 and the position information input in step S4. And the electromagnetic actuator 53 is operated based on the calculation result (step S5). As a result, an image blur correction operation is performed. However, the correction lens group 5 is actually driven only when the driving speed V is less than the predetermined value Vu. That is, when the driving speed V is equal to or higher than the predetermined value Vu, the angular speed is forcibly set to 0 in step S7, so that the calculated correction lens driving amount is 0 and the correction lens group 5 remains at the reference position. is there. If the correction lens group 5 is located at a position other than the reference position, it is held at that position after being driven to the reference position. That is, the driving of the correction lens 5 is substantially prohibited.
[0035]
After step S5, it is determined whether or not the above-described image stabilization command is continuously issued (step S6). For example, when the half-press operation is canceled due to the completion of photographing or the suspension of photographing, the image stabilization command is interrupted, so step S6 is denied and the image blur correction operation is stopped (step S8). On the other hand, when the half-press operation is continued, the process returns to step S2 and the above-described processing is repeated.
[0036]
In the above embodiment, the focusing lens group 4 is the focus adjustment optical system, the correction lens group 5 is the correction optical system, the ultrasonic motor 10 is the vibration wave motor, the gyro 51 is the image shake detection device, and the image shake correction. The mechanism 30 and the image blur correction mechanism drive control unit 50 constitute a correction drive device, the detection unit 45 constitutes a speed detection device, and the CPU 61 constitutes a control means.
[0037]
In the process of FIG. 6, the driving of the correction lens group 5 is prohibited by forcibly setting the angular velocity used for shake correction control to 0. However, as shown in FIG. 7, for example, the electromagnetic actuator 53 is inactivated. Thus, the driving of the correction lens group 5 may be prohibited. That is, if it is determined in step S2 that the driving speed V is equal to or higher than the predetermined value Vu, in step S11, the drive signal to the electromagnetic actuator 53 is turned off to stop the image blur correction operation, and the above steps S3 to S5 are skipped. Then, the process proceeds to step S6. In step S11, an operation of driving the correction lens group 5 to the reference position is performed only when the correction lens group 5 is not at the reference position. Thereafter, the correction lens group 5 is held at the reference position.
Thus, if the electromagnetic actuator 53 is deactivated and the driving of the correction lens group 5 is prohibited, power saving can be achieved as compared with the case where the driving is prohibited while the electromagnetic actuator 53 is operated (FIG. 6).
[0038]
Further, as shown in FIG. 8, the driving of the correction lens group 5 may be prohibited by using a lock portion 55. That is, if it is determined in step S2 that the driving speed V is equal to or higher than the predetermined value Vu, the correction lens group 5 is mechanically fixed to the reference position by the lock unit 55 in step S21, and the above steps S3 to S5 are skipped. Then, the process proceeds to step S6. Although it is desirable to release the drive signal to the electromagnetic actuator 53 after locking, it does not have to be released.
[0039]
-Second Embodiment-
A second embodiment of the present invention will be described with reference to FIG. Note that the hardware configuration is substantially the same as in the previous embodiment. In FIG. 9, the same steps as those in FIG.
[0040]
In the previous embodiment, the driving of the correction lens group 5 is permitted / prohibited according to the driving speed of the ultrasonic motor 10, but in the present embodiment, the driving of the correction lens group 5 is permitted / prohibited depending on the presence or absence of the tracking operation. Ban. The tracking operation is an operation of repeatedly performing focus adjustment so that the focusing lens group 4 follows the movement of the subject as described above. The tracking mode for performing this tracking operation may be set manually by the photographer, or may be automatically set by the camera when the subject is determined to be a moving object. In general, the driving speed of the ultrasonic motor in the tracking mode is slower than that in the normal mode. However, in this embodiment, the upper limit value of the speed of the ultrasonic motor 10 at the time of tracking is limited by the predetermined speed Vu described above.
[0041]
In FIG. 9, the CPU 61 receives information on whether or not the tracking mode is set in addition to the focusing command, the image stabilization command, the lens position information, and the like from the camera body. In step 31, it is determined whether or not the ultrasonic motor 10 is being driven, that is, whether or not a focus adjustment operation is being performed. If the ultrasonic motor 10 is not driven, the image blur correction operation in steps S3 to S5 is performed. If it is driven, the process proceeds to step 32. In step 32, it is determined whether or not the tracking mode is set. If it is set, the process proceeds to step 3. On the other hand, if the tracking mode is not set, the drive signal to the electromagnetic actuator 53 is turned off in step 11 to stop the image blur correction operation.
[0042]
Since the image blur correction operation is allowed when the tracking operation is performed in this way, a photograph free from image blur and blur can be taken without sacrificing the shooting response. Since the upper limit value of the motor driving speed during the tracking operation is less than the predetermined speed Vu, the vibrations of the ultrasonic motor 10 and the gyro 51 do not interfere with each other, and the correction optical system does not malfunction. On the other hand, when the tracking operation is not performed, the image blur correction operation is completely prohibited when the vibration wave motor 10 is driven, and therefore the malfunction of the correction lens group 5 due to vibration interference cannot occur.
[0043]
FIG. 10 shows an example in which the image blur correction operation is allowed / prohibited taking into account both the presence / absence of the tracking operation and the driving speed of the ultrasonic motor 10. Here, it is assumed that the upper limit value of the motor drive speed during the tracking operation matches the predetermined speed Vu.
[0044]
In FIG. 10, when the tracking mode is determined in step 32, it is determined in step 41 whether the driving speed V of the ultrasonic motor 10 is equal to or higher than the predetermined value Vu. If it is less than the predetermined value Vu, the image blur correction operation in step 3 and thereafter is performed. If it is greater than the predetermined value Vu, the drive signal to the electromagnetic actuator 53 is cut off in step 11 and the image blur correction operation is stopped.
[0045]
On the other hand, if not in the tracking mode, it is determined in step 42 whether or not the driving speed V of the ultrasonic motor 10 is equal to or higher than a predetermined value Va. Here, when the ultrasonic motor 10 is moving at high speed, that is, when focus adjustment is performed at high speed, it is difficult to check on the finder screen whether or not the image blur correction operation is being performed. Va is about the boundary speed indicating whether or not the image blur correction operation can be confirmed, and is a value smaller (lower speed) than Vu. If the drive speed V is less than the predetermined value Va, the image blur correction operation in step 3 and subsequent steps is performed. If the drive speed V is equal to or higher than the predetermined value Va, that is, whether the image blur correction operation is being performed cannot be confirmed on the finder screen. Sometimes, in step 11, the drive signal to the electromagnetic actuator 53 is cut off, and the image blur correction operation is stopped.
[0046]
In the above description, the interference between the ultrasonic motor and the gyro vibration has been described. For example, it is conceivable to perform focus adjustment and image blur correction using separate ultrasonic motors. Also in this case, the vibrations of the ultrasonic motor interfere with each other and the same problem as described above may occur, so that the present invention can be applied.
[0047]
The speed detection of the ultrasonic motor is not limited to the embodiment, and can be detected from the frequency of the oscillation unit, for example. Further, although the gyro is used as the camera shake detection means, a sensor other than the gyro may be used as long as the vibration can be detected by generating the vibration. Furthermore, in the above-described embodiment, an ultrasonic motor that generates nine traveling waves is used, but an ultrasonic motor having another wave number may be used. Further, a vibration wave motor other than the ultrasonic motor may be used. For example, a mode-degenerate type vibrator using a primary mode vibration and a torsional secondary vibration may be used.
[0048]
The configuration of the image shake correction mechanism is not limited to that shown in FIG. 3, and the shake correction lens may be driven using an actuator (for example, a DC motor) other than the electromagnetic actuator. Although described with an interchangeable lens of a camera, the present invention can also be applied to other optical devices including a vibration wave motor and an image blur correction mechanism, such as a lens-integrated still camera and a video camera.
[0049]
【The invention's effect】
According to the first and ninth aspects of the present invention, since the drive of the correction optical system by the image blur correction device is permitted / prohibited based on the information on the drive speed of the vibration wave motor, vibration interference can occur. In addition, the driving of the correction optical system can be prohibited, and malfunction of the correction optical system due to vibration interference can be avoided. On the other hand, when there is no risk of vibration interference, a photo with no image blur can be obtained by performing an image blur correction operation.
According to the fourth and eleventh aspects of the present invention, when the tracking mode in which the focus adjustment optical system repeatedly repeats the focus adjustment so as to follow the movement of the subject is set, the correction drive device operates when the vibration wave motor is driven. When the correction optical system is allowed to drive and the tracking mode is not set, the correction optical system is prohibited from driving when the vibration wave motor is driven. It is possible to take a picture free from image blur and blur without sacrificing the shooting response. Since the motor drive speed in the tracking mode is slow, the vibrations of the vibration wave motor and the image blur detection device do not interfere with each other, and the correction optical system does not malfunction. On the other hand, when not in the tracking mode, the correction optical system is prohibited from driving when the vibration wave motor is driven, so that the correction optical system cannot malfunction.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an interchangeable lens according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a configuration of an ultrasonic motor.
FIG. 3 is a cross-sectional view illustrating a configuration of an image shake correction mechanism.
FIG. 4 is a block diagram showing a control system of an interchangeable lens, showing a part related to image blur correction and ultrasonic motor driving.
FIG. 5 is a diagram for explaining interference between the vibration of an ultrasonic motor and the vibration of a gyro.
FIG. 6 is a flowchart for explaining the operation of the first embodiment;
FIG. 7 is a flowchart for explaining the operation of another embodiment.
FIG. 8 is a flowchart for explaining the operation of another embodiment.
FIG. 9 is a flowchart for explaining the operation of the second embodiment;
FIG. 10 is a flowchart for explaining the operation of another embodiment.
[Explanation of symbols]
3 fixed lens group
4 Focusing lens group
5 Correction lens group
10 Ultrasonic motor
30 Image blur correction mechanism
40 Ultrasonic motor drive controller
41, 52 control unit
50 Image shake correction device drive controller
51 Gyro
53 Electromagnetic actuator
54 detector
61 CPU

Claims

A correction optical system that is driven to correct image shake on the image plane;
An image shake detection device that detects shake amount information according to vibrations of the optical device;
A correction driving device that drives the correction optical system based on the shake amount information;
In optical equipment equipped with a vibration wave motor,
A speed detecting device for detecting information on the driving speed of the vibration wave motor;
Control means for permitting / prohibiting driving of the correction optical system by the correction driving device based on a detection result of the speed detection device,
When the speed of the vibration wave motor is less than a predetermined speed at which the vibration of the vibration wave motor and the vibration generated by the image shake detection device do not interfere with each other, the control means performs the correction optical system using the correction drive device. An optical apparatus capable of image blur correction, wherein the driving of the correction optical system by the correction driving device is prohibited when the speed is equal to or higher than the predetermined speed.

An optical system including a focus adjustment optical system driven for focus adjustment and a correction optical system driven to correct image shake in the image plane;
A vibration wave motor for driving the focusing optical system;
An image shake detection device that detects shake amount information according to the vibration of the optical device by itself vibrating;
In an optical apparatus comprising a correction drive device that drives the correction optical system based on the shake amount information,
When a tracking mode in which focus adjustment is repeatedly performed so that the focus adjustment optical system follows the movement of the subject is set, the correction optical system is allowed to be driven by the correction drive device when the vibration wave motor is driven. In addition, the upper limit value of the driving speed of the vibration wave motor is limited to a predetermined speed at which the vibration of the vibration wave motor and the vibration generated by the image shake detection device do not interfere with each other, and the tracking mode is set. An optical apparatus capable of correcting image blur, comprising control means for prohibiting driving of the correction optical system by the correction driving device when the vibration wave motor is driven when not present.

3. The image blur correction according to claim 1, wherein the control unit prohibits the movement of the correction optical system by providing the correction drive device with shake amount information indicating that the shake is zero. 4. Optical equipment that can be used.

3. The optical apparatus capable of image blur correction according to claim 1, wherein the control unit prohibits driving of the correction optical system by disabling the correction driving device.

The optical apparatus according to claim 1, wherein the control unit prohibits driving of the correction optical system by mechanically blocking movement of the correction optical system.

An optical system including a focus adjustment optical system driven for focus adjustment and a correction optical system driven to correct image shake in the image plane;
A vibration wave motor for driving the focusing optical system;
An image shake detection device that detects shake amount information according to the vibration of the optical device by itself vibrating;
In an optical apparatus comprising a correction drive device that drives the correction optical system based on the shake amount information,
A speed detecting device for detecting information on the driving speed of the vibration wave motor;
Allowing the correction optical system to be driven by the correction drive unit based on the presence or absence of a tracking mode in which focus adjustment is repeatedly performed so that the focus adjustment optical system follows the movement of the subject and the detection result of the speed detection device / Control means to prohibit,
Wherein, when the tracking mode is set, the driving speed of the vibration wave motor is a predetermined speed vibration and is unlikely to cause interference vibration to the image shake detecting device emits the vibration wave motor The correction optical system is allowed to be driven by the correction drive device when the drive speed is less than the predetermined value, and the drive of the correction optical system by the correction drive device is prohibited when the drive speed of the vibration wave motor is equal to or higher than the predetermined speed. An optical apparatus capable of correcting image blur.

A correction optical system that is driven to correct image shake on the image plane;
An image shake detection device that detects shake amount information according to the vibration of the interchangeable lens;
A correction driving device that drives the correction optical system based on the shake amount information;
In an interchangeable lens for a camera equipped with a vibration wave motor,
A speed detecting device for detecting information on the driving speed of the vibration wave motor;
Control means for permitting / prohibiting driving of the correction optical system by the correction driving device based on a detection result of the speed detection device,
When the speed of the vibration wave motor is less than a predetermined speed at which the vibration of the vibration wave motor and the vibration generated by the image shake detection device do not interfere with each other, the control means performs the correction optical system using the correction drive device. An interchangeable lens for a camera capable of image blur correction, characterized by permitting driving of the camera.

A photographing optical system including a focusing optical system that is driven for focus adjustment, and a correction optical system that is driven to correct image shake in the image plane;
A vibration wave motor for driving the focusing optical system;
An image shake detection device that detects shake amount information according to the vibration of the optical device by itself vibrating;
In an interchangeable lens for a camera provided with a correction driving device that drives the correction optical system based on the shake amount information.
When a tracking mode in which focus adjustment is repeatedly performed so that the focus adjustment optical system follows the movement of the subject is set, the correction optical system is allowed to be driven by the correction drive device when the vibration wave motor is driven. In addition, the upper limit value of the driving speed of the vibration wave motor is limited to a predetermined speed at which the vibration of the vibration wave motor and the vibration generated by the image shake detection device do not interfere with each other, and the tracking mode is set. An interchangeable lens for a camera capable of image blur correction, comprising control means for prohibiting driving of the correction optical system by the correction driving device when the vibration wave motor is driven.

A photographing optical system including a focusing optical system that is driven for focus adjustment, and a correction optical system that is driven to correct image shake in the image plane;
An image blur detection device that detects vibration amount information according to the vibration of the interchangeable lens by itself generating vibrations;
A correction driving device that drives the correction optical system based on the shake amount information;
In an interchangeable lens for a camera provided with a vibration wave motor that drives the focus adjustment optical system,
A speed detecting device for detecting information on the driving speed of the vibration wave motor;
Allowing the correction optical system to be driven by the correction drive unit based on the presence or absence of a tracking mode in which focus adjustment is repeatedly performed so that the focus adjustment optical system follows the movement of the subject and the detection result of the speed detection device / Control means to prohibit,
Wherein, when the tracking mode is set, the driving speed of the vibration wave motor is a predetermined speed vibration and is unlikely to cause interference vibration to the image shake detecting device emits the vibration wave motor The correction optical system is allowed to be driven by the correction drive device when the drive speed is less than the predetermined value, and the drive of the correction optical system by the correction drive device is prohibited when the drive speed of the vibration wave motor is equal to or higher than the predetermined speed. An interchangeable lens for a camera capable of correcting image blur.

Detect shake amount information according to the vibration of the optical device using an image shake detection device,
Based on the shake amount information, the optical component is driven to correct the shake of the image on the image plane of the optical device,
Detecting information about the speed of the vibration wave motor used in the optical instrument;
Controlling the speed of the vibration wave motor to permit driving of the optical component when the vibration of the vibration wave motor and the vibration generated by the image shake detection device are less than a predetermined speed at which interference does not occur , A method of using an optical apparatus, wherein control is performed to prohibit driving of the optical component when a speed of the vibration wave motor is equal to or higher than the predetermined speed .