JP2008209435A - Camera-shake correcting device and optical device - Google Patents

Camera-shake correcting device and optical device Download PDF

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JP2008209435A
JP2008209435A JP2007043301A JP2007043301A JP2008209435A JP 2008209435 A JP2008209435 A JP 2008209435A JP 2007043301 A JP2007043301 A JP 2007043301A JP 2007043301 A JP2007043301 A JP 2007043301A JP 2008209435 A JP2008209435 A JP 2008209435A
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moving member
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JP5012085B2 (en
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Kenichi Kitano
賢一 北野
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Nikon Corp
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<P>PROBLEM TO BE SOLVED: To provide a camera-shake correction device for stably controlling shake correction even when a movable part rotates around the center of gravity of the movable part, and to provide an optical device having the camera-shake correction device. <P>SOLUTION: The camera-shake correction device includes: a first member 110 and a second member 120 which are relatively movable; a first detection part 150 for detecting the relative movement of the first member 110 and the second member 120 along a first direction; and a second detection part 160 for detecting the relative movement of the first member 110 and the second member 120 along a second direction crossing the first direction. An intersection point C1 of the first direction β1 and the second direction β2 is provided on the center of gravity G1 of the first member 110 or the second member 120, or provided near the center of gravity G1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、ブレ補正装置と、そのブレ補正装置を有する光学装置に関する。   The present invention relates to a shake correction apparatus and an optical apparatus having the shake correction apparatus.

手振れなどによる撮像画像のブレを抑制することができるブレ補正装置としては、種々のものが知られている。たとえば、下記の特許文献１〜３に示すように、光軸Ｚに垂直なＸ−Ｙ平面内で、補正レンズを、検出されたカメラのブレに合わせて、Ｘ軸およびＹ軸の双方にシフト移動させる光学式のブレ補正装置が知られている。   Various types of blur correction apparatuses that can suppress blurring of a captured image due to camera shake or the like are known. For example, as shown in Patent Documents 1 to 3 below, in the XY plane perpendicular to the optical axis Z, the correction lens is shifted to both the X axis and the Y axis in accordance with the detected camera shake. 2. Description of the Related Art An optical blur correction device that moves is known.

このような光学式のブレ補正装置においては、各軸方向のブレを検出するためのセンサにより規定される制御中心位置と、アクチュエータなどによりシフト移動させられる可動部の重心位置とが異なる場合がある。特に、カメラの小型化に伴い、ブレ補正装置において、制御中心位置と可動部の重心位置とを合わせにくい場合がある。   In such an optical shake correction apparatus, the control center position defined by the sensor for detecting the shake in each axial direction may be different from the center of gravity position of the movable part shifted by an actuator or the like. . In particular, as the camera is downsized, it may be difficult to match the control center position and the gravity center position of the movable part in the shake correction apparatus.

ところが、このように制御中心位置と可動部の重心位置とが異なる場合には、可動部をシフト移動させるためのＶＣＭなどのアクチュエータの力により可動部に回転が生じる場合がある。そのような場合には、Ｘ軸の駆動によりＹ軸の出力が変化してしまうために、制御が不安定になることがあった。
特開２００１−２２８４９８号公報 特開２００２−１９６３８２号公報 特開平３−３７６１５号公報 However, when the control center position and the gravity center position of the movable part are different as described above, the movable part may be rotated by the force of an actuator such as a VCM for shifting the movable part. In such a case, since the output of the Y axis changes due to the driving of the X axis, the control may become unstable.
JP 2001-228498 A JP 2002-196382 A JP-A-3-37615

本発明は、このような実状に鑑みてなされ、その目的は、可動部の重心回りに可動部が回転したとしても、安定してブレ補正制御を行うことができるブレ補正装置と、そのブレ補正装置を具備する光学装置を提供することである。   The present invention has been made in view of such a situation, and an object of the present invention is to provide a shake correction device that can stably perform shake correction control even when the movable portion rotates around the center of gravity of the movable portion, and the shake correction thereof. An optical device comprising the device is provided.

上記目的を達成するために、本発明の第１の観点に係るブレ補正装置は、
固定部材（１１０）に対向する平面上を前記固定部材に対して相対移動可能な移動部材（１２０）と、
前記移動部材（１２０）に備えられ、前記移動部材の重心、又は、前記重心に近接した位置を通り前記平面と平行な第１方向に沿った磁界を形成する第１の磁石（１５１）と、
前記移動部材に備えられ、前記移動部材の重心、又は、前記重心に近接した位置を通り前記平面と平行な第２方向に沿った磁界を形成する第２の磁石（１６１）と、
前記固定部材に備えられ、前記第１の磁石の磁界を検出する第１の磁気検出素子（１５２）と、
前記固定部材に備えられ、前記第２の磁石の磁界を検出する第２の磁気検出素子（１６２）とを含むことを特徴とする。 In order to achieve the above object, a shake correction apparatus according to the first aspect of the present invention provides:
A moving member (120) movable relative to the fixing member on a plane facing the fixing member (110);
A first magnet (151) provided in the moving member (120), which forms a magnetic field along a first direction parallel to the plane passing through a center of gravity of the moving member or a position close to the center of gravity;
A second magnet (161) provided in the moving member and forming a magnetic field along a second direction parallel to the plane passing through the center of gravity of the moving member or a position close to the center of gravity;
A first magnetic detection element (152) provided on the fixing member for detecting a magnetic field of the first magnet;
And a second magnetic detection element (162) that is provided in the fixing member and detects a magnetic field of the second magnet.

本発明の第２の観点に係るブレ補正装置は、
固定部材（１１０）に対向する平面上を前記固定部材に対して相対移動可能な移動部材（１２０）と、
前記移動部材（１２０）の重心、又は、前記重心に近接した位置を通り前記平面と平行な第１方向に沿った前記固定部材と前記移動部材との相対移動を検出する第１の検出部（１５０）と、
前記第１方向（β１）と交差し、前記移動部材の重心、又は、前記重心に近接した位置を通り前記平面と平行な第２方向（β２）に沿った前記固定部材と前記移動部材との相対移動を検出する第２の検出部（１６０）とを含むことを特徴とする。
上記のブレ補正装置は、好ましくは、
前記平面と平行な第３方向（α１）に沿って前記固定部材と前記移動部材とを相対移動させる第１の駆動部（１３０）と、
前記第３方向と交差し、前記平面と平行な第４方向（α２）に沿って前記固定部材と前記移動部材とを相対移動させる第２の駆動部（１４０）とを含み、
前記第１方向と前記第２方向との交差角（θ１）は、前記第３方向と前記第４方向との交差角（θ２）とは異なる。 The blur correction apparatus according to the second aspect of the present invention is:
A moving member (120) movable relative to the fixing member on a plane facing the fixing member (110);
A first detection unit that detects a relative movement between the fixed member and the moving member along a first direction parallel to the plane passing through the position of the center of gravity of the moving member (120) or in the vicinity of the center of gravity; 150),
Crossing the first direction (β1) and passing through the center of gravity of the moving member or a position close to the center of gravity, the fixed member and the moving member along the second direction (β2) parallel to the plane And a second detector (160) for detecting relative movement.
The blur correction device described above is preferably
A first drive unit (130) for relatively moving the fixed member and the moving member along a third direction (α1) parallel to the plane;
A second drive unit (140) that crosses the third direction and relatively moves the fixed member and the moving member along a fourth direction (α2) parallel to the plane;
The intersection angle (θ1) between the first direction and the second direction is different from the intersection angle (θ2) between the third direction and the fourth direction.

好ましくは、前記第３方向と前記第４方向との交差角（θ２）は、９０度である。   Preferably, an intersection angle (θ2) between the third direction and the fourth direction is 90 degrees.

好ましくは、前記固定部材又は前記移動部材は、前記第１方向と前記第２方向との交点を制御中心（Ｃ１）として相対移動する。   Preferably, the fixed member or the moving member relatively moves with an intersection of the first direction and the second direction as a control center (C1).

好ましくは、前記移動部材は、像ブレを補正するための光学系を含む。あるいは、前記移動部材は、光学系による像を撮像する撮像素子を含んでもよい。   Preferably, the moving member includes an optical system for correcting image blur. Alternatively, the moving member may include an image sensor that captures an image by an optical system.

好ましくは、前記第１の検出部は、前記第１方向に沿って形成された磁場を用いて前記固定部材と前記移動部材との相対移動を検出し、
前記第２の検出部は、前記第２方向に沿って形成された磁場を用いて前記固定部材と前記移動部材との相対移動を検出する。 Preferably, the first detection unit detects a relative movement between the fixed member and the moving member using a magnetic field formed along the first direction,
The second detection unit detects a relative movement between the fixed member and the moving member using a magnetic field formed along the second direction.

本発明に係る光学装置は、上記されたブレ補正装置を備えたことを特徴とする光学装置である。   An optical device according to the present invention is an optical device including the above-described blur correction device.

以下、本発明を、図面に示す実施形態に基づき説明する。
図１は本発明の一実施形態に係るブレ補正装置を具備するカメラの概略断面図、
図２は図１に示すカメラ内におけるブレ補正装置のII−II線に沿う平面図、
図３は図２に示すIII−III線に沿う概略断面図、
図４は図３に示すIV−IV線に沿う概略断面図、
図５（Ａ）および図５（Ｂ）は制御中心位置と重心位置とが一致している場合における回転により生じる変位を示す概略図、図５（Ｃ）および図５（Ｄ）は制御中心位置と重心位置とが一致していない場合における回転により生じる変位を示す概略図である。 Hereinafter, the present invention will be described based on embodiments shown in the drawings.
FIG. 1 is a schematic cross-sectional view of a camera including a shake correction apparatus according to an embodiment of the present invention.
FIG. 2 is a plan view taken along line II-II of the shake correction apparatus in the camera shown in FIG.
FIG. 3 is a schematic sectional view taken along line III-III shown in FIG.
4 is a schematic cross-sectional view taken along line IV-IV shown in FIG.
5 (A) and 5 (B) are schematic diagrams showing displacement caused by rotation when the control center position and the gravity center position coincide with each other, and FIGS. 5 (C) and 5 (D) show the control center position. It is the schematic which shows the displacement which arises by rotation in case a gravity center position does not correspond.

図１に示すように、本発明の一実施形態に係るカメラ１は、いわゆるコンパクトカメラであり、カメラボディ１ａ内にレンズ鏡筒２を有する。レンズ鏡筒２は、対物側から順に、第１レンズ群Ｌ１、プリズムＰ、第２レンズ群Ｌ２、第３レンズ群Ｌ３、ブレ補正レンズ群（第４レンズ群）Ｌ４、第５レンズ群Ｌ５を配列して構成された撮像光学系を備えている。また、この実施形態のカメラ１では、第５レンズ群Ｌ５の背後（像面側）に、ローパスフィルタ４およびＣＣＤなどの撮像素子３を具備してある。また、第３レンズ群Ｌ３と第４レンズ群Ｌ４との間には、シャッタ絞りユニット５を備えている。   As shown in FIG. 1, a camera 1 according to an embodiment of the present invention is a so-called compact camera, and has a lens barrel 2 in a camera body 1a. The lens barrel 2 includes a first lens unit L1, a prism P, a second lens unit L2, a third lens unit L3, a blur correction lens unit (fourth lens unit) L4, and a fifth lens unit L5 in order from the objective side. An imaging optical system configured in an array is provided. In the camera 1 of this embodiment, the low-pass filter 4 and the image sensor 3 such as a CCD are provided behind the fifth lens unit L5 (on the image plane side). A shutter aperture unit 5 is provided between the third lens unit L3 and the fourth lens unit L4.

第１レンズ群Ｌ１は、撮像光学系のうち最も対物側に設けられた対物レンズである。プリズムＰは、第１レンズ群Ｌ１が射出した被写体の光を全反射させてその進行方向を９０度曲げる直角プリズムである。以下、この撮像光学系におけるプリズムＰの入射側の光軸、射出側の光軸に、それぞれ符号 Ａ１、Ａ２を付して説明する。   The first lens unit L1 is an objective lens provided on the most object side in the imaging optical system. The prism P is a right-angle prism that totally reflects the light of the subject emitted by the first lens unit L1 and bends its traveling direction by 90 degrees. Hereinafter, the optical axis on the incident side and the optical axis on the exit side of the prism P in this imaging optical system will be described with reference numerals A1 and A2, respectively.

光軸Ａ２は、通常撮影時において、プリズムＰに対して鉛直方向に配置され、第２レンズ群Ｌ２よりも像側の各レンズ群は、プリズムＰに対して下側に順次配列されている。ここで、本明細書において「通常撮影時」とは、対物側の光軸Ａ１を略水平とし、表示部１２の長辺方向を略水平としたカメラの姿勢を指すものとする。   The optical axis A2 is arranged in the vertical direction with respect to the prism P during normal photographing, and the lens groups on the image side with respect to the second lens group L2 are sequentially arranged below the prism P. In this specification, “during normal shooting” refers to the posture of the camera in which the optical axis A1 on the objective side is substantially horizontal and the long side direction of the display unit 12 is substantially horizontal.

第２レンズ群Ｌ２は、プリズムＰの射出側に設けられている。第２レンズ群Ｌ２は、プリズムＰに対する位置が固定されている。第３レンズ群Ｌ３は、第２レンズ群Ｌ２の射出側に設けられ、光軸Ａ２上での位置が固定されている。また、第３レンズ群Ｌ３は、図示しないレンズ駆動モータによって、光軸Ａ２上を移動する。   The second lens group L2 is provided on the exit side of the prism P. The position of the second lens group L2 with respect to the prism P is fixed. The third lens group L3 is provided on the exit side of the second lens group L2, and its position on the optical axis A2 is fixed. The third lens unit L3 moves on the optical axis A2 by a lens driving motor (not shown).

ブレ補正レンズ群（第４レンズ群）Ｌ４は、第３レンズ群Ｌ３の射出側に設けられ、ブレ補正装置１００の一部を構成するものである。このブレ補正装置１００の構成、機能については後に詳しく説明する。ブレ補正レンズ群Ｌ４は、他のレンズ群に対して、光軸Ａ２と直交する面内でシフト変位することによって、カメラの動きに起因する像ブレを低減する。   The blur correction lens group (fourth lens group) L4 is provided on the exit side of the third lens group L3 and constitutes a part of the blur correction apparatus 100. The configuration and function of the shake correction apparatus 100 will be described in detail later. The blur correction lens unit L4 shifts and shifts in the plane orthogonal to the optical axis A2 with respect to the other lens units, thereby reducing image blur due to camera movement.

第５レンズ群Ｌ５は、ブレ補正レンズ群Ｌ４の射出側に設けられ、光軸Ａ２上の位置が固定されている。また、第５レンズ群Ｌ５は、図示しないレンズ駆動モータによって、光軸Ａ２上を移動する。   The fifth lens unit L5 is provided on the exit side of the blur correction lens unit L4, and the position on the optical axis A2 is fixed. The fifth lens unit L5 moves on the optical axis A2 by a lens drive motor (not shown).

撮像素子３は、第５レンズ群Ｌ５の射出側に設けられたＣＣＤなどの固体撮像素子である。撮像素子３は、撮像光学系が撮像面上に結像する被写体像の光に基づいて、電気的な画像出力信号を生成する。ローパスフィルタ（ＬＰＦ）４は、第５レンズ群Ｌ５と撮像素子３との間に設けられ、撮像素子３が出力する画像出力信号におけるモアレの発生を防止するものである。   The image sensor 3 is a solid-state image sensor such as a CCD provided on the exit side of the fifth lens unit L5. The imaging element 3 generates an electrical image output signal based on the light of the subject image formed on the imaging surface by the imaging optical system. The low-pass filter (LPF) 4 is provided between the fifth lens unit L5 and the image sensor 3, and prevents the occurrence of moire in the image output signal output from the image sensor 3.

シャッタ絞りユニット５は、ブレ補正レンズ群Ｌ４の入射側に設けられ、撮像光学系を通過する像光の光量を規制する絞り部と、像光が撮像素子３に露光する露光時間を調整するシャッタ部とを備えている。   The shutter aperture unit 5 is provided on the incident side of the blur correction lens group L4, and has a diaphragm portion that regulates the amount of image light that passes through the imaging optical system, and a shutter that adjusts the exposure time during which the image light is exposed to the imaging device 3. Department.

以下、カメラ１のレンズ鏡筒２に内蔵してあるブレ補正装置１００について、詳細に説明する。ブレ補正装置１００は、図２〜図４に示すように、固定部１１０と可動部１２０とを有する。固定部１１０は、光軸Ａ２に対するその位置が固定された部分である。可動部１２０は、固定部１１０に対して、光軸Ａ２に直交するＸ軸−Ｙ軸平面内で移動可能に支持されている。可動部１２０には、上述したブレ補正レンズ群Ｌ４が、Ｘ軸方向の略中央部に固定されている。   Hereinafter, the blur correction device 100 built in the lens barrel 2 of the camera 1 will be described in detail. As shown in FIGS. 2 to 4, the shake correction apparatus 100 includes a fixed portion 110 and a movable portion 120. The fixed portion 110 is a portion whose position with respect to the optical axis A2 is fixed. The movable part 120 is supported so as to be movable with respect to the fixed part 110 within an X-axis-Y-axis plane orthogonal to the optical axis A2. In the movable portion 120, the above-described blur correction lens group L4 is fixed at a substantially central portion in the X-axis direction.

図２に示すように、固定部１１０および可動部１２０は、光軸Ａ２方向から見ると、光軸Ａ１と平行な方向（図２におけるＹ方向）の寸法よりも、光軸Ａ１および光軸Ａ２に直交する方向（図２におけるＸ方向）の寸法のほうが大きい略矩形状に形成されている。   As shown in FIG. 2, when viewed from the optical axis A2 direction, the fixed portion 110 and the movable portion 120 have an optical axis A1 and an optical axis A2 that are larger than the dimension in the direction parallel to the optical axis A1 (the Y direction in FIG. 2). 2 is formed in a substantially rectangular shape having a larger dimension in the direction orthogonal to (the X direction in FIG. 2).

固定部１１０に対して可動部１２０をＸ軸−Ｙ軸平面内で滑らかに移動させるために、これらの間には、図３および図４に示すように、鋼球などで構成された転がり軸受１７０が配置してある。また、図２に示すように、固定部１１０に対して可動部１２０を、光軸Ａ２と直交するＸ軸−Ｙ軸平面内において駆動移動させるために、電磁アクチュエータとしてのボイスコイルモータ（ＶＣＭ）１３０，１４０が、固定部１１０と可動部１２０との間に装着してある。   In order to smoothly move the movable unit 120 in the X-axis-Y-axis plane with respect to the fixed unit 110, a rolling bearing composed of a steel ball or the like is interposed between them as shown in FIGS. 170 is arranged. Further, as shown in FIG. 2, a voice coil motor (VCM) as an electromagnetic actuator is used to drive and move the movable portion 120 with respect to the fixed portion 110 in an X-axis-Y-axis plane orthogonal to the optical axis A2. 130 and 140 are mounted between the fixed portion 110 and the movable portion 120.

ＶＣＭ１３０は、図３に示すように、コイル１３１、マグネット１３２、ヨーク１３３を備えている。コイル１３１は、可動部１２０に対向した状態で固定部１１０に固定された電気子巻線である。また、コイル１３１は、第１駆動方向α１と直交する方向を長軸とする長円状に形成されている。マグネット１３２は、コイル１３１に対向した状態で可動部１２０に固定される。ヨーク１３３は、たとえば鉄系金属等によってプレート状に形成された磁性体であり、コイル１３１のマグネット１３２とは反対側の可動部１２０の表面に配置されている。   As shown in FIG. 3, the VCM 130 includes a coil 131, a magnet 132, and a yoke 133. The coil 131 is an electric winding fixed to the fixed portion 110 in a state of facing the movable portion 120. The coil 131 is formed in an oval shape having a major axis in a direction orthogonal to the first drive direction α1. The magnet 132 is fixed to the movable unit 120 in a state of facing the coil 131. The yoke 133 is a magnetic body formed of, for example, iron-based metal in a plate shape, and is disposed on the surface of the movable portion 120 on the opposite side of the coil 131 from the magnet 132.

ＶＣＭ１４０は、ＶＣＭ１３０と同様な構成であり、図４に示すように、コイル１４１、マグネット１４２、ヨーク１４３を備えている。コイル１４１は、可動部１２０に対向した状態で固定部１１０に固定された電気子巻線である。また、コイル１４１は、第２駆動方向α２と直交する方向を長軸とする長円状に形成されている。マグネット１４２は、コイル１４１に対向した状態で可動部１２０に固定される。ヨーク１４３は、たとえば鉄系金属等によってプレート状に形成された磁性体であり、コイル１４１のマグネット１４２とは反対側の可動部１２０の表面に配置されている。   The VCM 140 has the same configuration as the VCM 130, and includes a coil 141, a magnet 142, and a yoke 143, as shown in FIG. The coil 141 is an electric coil fixed to the fixed unit 110 in a state of facing the movable unit 120. The coil 141 is formed in an oval shape having a major axis in a direction orthogonal to the second drive direction α2. The magnet 142 is fixed to the movable unit 120 in a state of facing the coil 141. The yoke 143 is a magnetic body formed of, for example, a ferrous metal in a plate shape, and is disposed on the surface of the movable portion 120 on the opposite side of the coil 141 from the magnet 142.

これらＶＣＭ１３０および１４０は、たとえば角速度センサなどによって検出されたカメラ１の傾き角に応じて、固定部１１０に対して可動部１２０を駆動し、補正レンズ群Ｌ４の光軸Ａ２０を、その他のレンズ群Ｌ２，Ｌ３，Ｌ５の光軸Ａ２に対して移動制御することにより、像ブレを低減する。   These VCMs 130 and 140 drive the movable unit 120 with respect to the fixed unit 110 according to the tilt angle of the camera 1 detected by, for example, an angular velocity sensor, and set the optical axis A20 of the correction lens group L4 to other lens groups. Image blurring is reduced by controlling movement relative to the optical axis A2 of L2, L3, and L5.

また、Ｘ軸−Ｙ軸平面内で固定部１１０に対して可動部１２０の移動量を検出して、ＶＣＭ１３０および１４０による駆動移動量を制御するために、固定部１１０と可動部１２０との間には、第１位置センサ１５０および第２位置センサ１６０が装着してある。   Further, in order to detect the amount of movement of the movable unit 120 with respect to the fixed unit 110 in the X-axis-Y-axis plane and to control the amount of drive movement by the VCMs 130 and 140, between the fixed unit 110 and the movable unit 120. Are equipped with a first position sensor 150 and a second position sensor 160.

第１位置センサ１５０は、図４に示すように、マグネット１５１、ホール素子１５２を備えている。マグネット１５１は、固定部１１０に対向した状態で可動部１２０に固定された永久磁石である。ホール素子１５２は、マグネット１５１に対向した状態で固定部１１０に固定された磁気センサである。このホール素子１５２は、可動部１２０の固定部１１０に対する変位に応じたマグネット１５１の磁界の変化を検出するものである。この第１位置センサ１５０は、図２において、第１センサ方向β１に沿った固定部１１０に対する可動部１２０の相対移動量を検出することが可能になっている。   As shown in FIG. 4, the first position sensor 150 includes a magnet 151 and a hall element 152. The magnet 151 is a permanent magnet fixed to the movable unit 120 in a state of facing the fixed unit 110. The Hall element 152 is a magnetic sensor fixed to the fixing unit 110 in a state of facing the magnet 151. The Hall element 152 detects a change in the magnetic field of the magnet 151 according to the displacement of the movable part 120 relative to the fixed part 110. The first position sensor 150 can detect the relative movement amount of the movable portion 120 with respect to the fixed portion 110 along the first sensor direction β1 in FIG.

また、第２位置センサ１６０は、第１位置センサ１５０と同様な構成であり、図３に示すように、マグネット１６１、ホール素子１６２を備えている。マグネット１６１は、固定部１１０に対向した状態で可動部１２０に固定された永久磁石である。ホール素子１６２は、マグネット１６１に対向した状態で固定部１１０に固定された磁気センサである。このホール素子１６２は、可動部１２０の固定部１１０に対する変位に応じたマグネット１６１の磁界の変化を検出するものである。この第２位置センサ１６０は、図２において、第２センサ方向β２に沿った固定部１１０に対する可動部１２０の相対移動量を検出することが可能になっている。   The second position sensor 160 has the same configuration as the first position sensor 150, and includes a magnet 161 and a hall element 162 as shown in FIG. The magnet 161 is a permanent magnet fixed to the movable part 120 in a state of facing the fixed part 110. The hall element 162 is a magnetic sensor fixed to the fixing unit 110 in a state of facing the magnet 161. The Hall element 162 detects a change in the magnetic field of the magnet 161 according to the displacement of the movable part 120 relative to the fixed part 110. The second position sensor 160 can detect the relative movement amount of the movable portion 120 with respect to the fixed portion 110 along the second sensor direction β2 in FIG.

本実施形態では、図２に示すように、補正レンズ群Ｌ４の光軸Ａ２０に対して、Ｘ軸およびＹ軸平面上での可動部１２０の全体の重心Ｇ１が一致するように、可動部１２０の形状、永久磁石１３２，１４２，１５１，１６１およびヨーク１３３，１４３の重量や位置などが調整してある。しかも本実施形態では、第１センサ方向β１と第２センサ方向β２との交点である制御中心Ｃ１が、重心Ｇ１に一致するように、第１センサ方向β１と第２センサ方向β２とのセンサ交差角度θ１が調整してある。なお、本明細書では、「一致する」とは、「所定範囲内で近接する」意味も含んで用いられる。その場合における所定範囲内とは、例えば組立誤差や製造誤差の範囲内である。   In the present embodiment, as shown in FIG. 2, the movable portion 120 is arranged such that the entire center of gravity G1 of the movable portion 120 on the X-axis and Y-axis planes coincides with the optical axis A20 of the correction lens group L4. And the weights and positions of the permanent magnets 132, 142, 151, 161 and the yokes 133, 143 are adjusted. Moreover, in the present embodiment, the sensor intersection between the first sensor direction β1 and the second sensor direction β2 so that the control center C1 that is the intersection of the first sensor direction β1 and the second sensor direction β2 coincides with the center of gravity G1. The angle θ1 is adjusted. In the present specification, “match” includes the meaning of “adjacent within a predetermined range”. The predetermined range in that case is, for example, within a range of assembly error or manufacturing error.

一眼レフカメラなどでは、センサ交差角度θ１を９０度に設定することが一般的である。可動部１２０におけるＸ軸−Ｙ軸平面形状が限定されるコンパクトカメラなどにおいても、従来では、センサ交差角度θ１を９０度に設定することが一般的である。しかしながら、従来では、センサ交差角度θ１を９０度に設定すると、図５（Ｃ）に示すように、制御中心Ｃ１が、可動部１２０の重心Ｇ１に一致しないことがあった。   In a single-lens reflex camera or the like, the sensor crossing angle θ1 is generally set to 90 degrees. Even in a compact camera or the like in which the X-axis-Y-axis planar shape of the movable unit 120 is limited, conventionally, the sensor crossing angle θ1 is generally set to 90 degrees. However, conventionally, when the sensor crossing angle θ1 is set to 90 degrees, the control center C1 may not coincide with the center of gravity G1 of the movable portion 120 as shown in FIG.

そのため、従来では、図５（Ｄ）に示すようにＶＣＭ駆動力等により、可動部１２０が重心Ｇ１の回りに所定角度θで回転すると、第１位置センサ１５０および第２位置センサ１６０には第１センサ方向β１及び第２センサ方向β２方向の並進移動が無くても、回転による移動量誤差δＫａおよびδＫｂが生じ、センサ出力誤差となる。   Therefore, conventionally, as shown in FIG. 5D, when the movable portion 120 is rotated around the center of gravity G1 by a predetermined angle θ by the VCM driving force or the like, the first position sensor 150 and the second position sensor 160 are Even if there is no translational movement in the one sensor direction β1 and the second sensor direction β2, movement amount errors δKa and δKb are generated due to rotation, resulting in a sensor output error.

従来では、回転による所定角度θを０．７度とし、制御中心Ｃ１からホール素子１５２，１６２までの距離を７mmとし、重心Ｇ１と制御中心Ｃ１とのズレ量を１．０mmとした場合には、この回転による移動量誤差δＫａおよびδＫｂは、約９．２μｍほどになり、ブレ補正制御の精度が不安定になる一因になっていた。そのため、ブレ補正制御の精度が低下するおそれがあった。   Conventionally, when the predetermined angle θ due to rotation is 0.7 degrees, the distance from the control center C1 to the Hall elements 152, 162 is 7 mm, and the deviation amount between the center of gravity G1 and the control center C1 is 1.0 mm. The movement amount errors δKa and δKb due to this rotation are about 9.2 μm, which is one factor that makes the accuracy of blur correction control unstable. For this reason, there is a possibility that the accuracy of the blur correction control is lowered.

これに対して本実施形態では、図５（Ａ）および図５（Ｂ）に示すように、たとえば可動部１２０が重心Ｇ１の回りに所定角度θで回転した場合でも、この回転による移動量誤差δＫａは小さい。すなわち、本実施形態では、回転による所定角度θを０．７度とし、制御中心Ｃ１からホール素子１５２，１６２までの距離を７mmとした場合には、この回転による移動量誤差δＫａおよびδＫｂは、約０．５μｍほどに小さい。そのため、ブレ補正制御が不安定になるおそれは少ない。   On the other hand, in the present embodiment, as shown in FIGS. 5A and 5B, even when the movable portion 120 rotates around the center of gravity G1 at a predetermined angle θ, for example, the movement amount error due to this rotation. δKa is small. That is, in this embodiment, when the predetermined angle θ due to rotation is 0.7 degrees and the distance from the control center C1 to the Hall elements 152 and 162 is 7 mm, the movement amount errors δKa and δKb due to this rotation are: As small as about 0.5 μm. Therefore, there is little possibility that the blur correction control becomes unstable.

すなわち、本実施形態では、重心Ｇ１と制御中心Ｃ１とを一致させることで、可動部１２０の回転による移動量誤差δＫａおよびδＫｂを極力小さくすることができ、センサ１５０および１６０からのセンサ出力に基づく制御が不安定になることを防止することができる。   That is, in this embodiment, by making the center of gravity G1 coincide with the control center C1, the movement amount errors δKa and δKb due to the rotation of the movable portion 120 can be minimized, and based on sensor outputs from the sensors 150 and 160. It is possible to prevent the control from becoming unstable.

なお、本実施形態においては、図２に示すように、制御中心Ｃ１が、重心Ｇ１に一致するように、第１センサ方向β１と第２センサ方向β２とのセンサ交差角度θ１が調整してあるので、センサ交差角度θ１は、必ずしも９０度である必要はない。ただし、センサ交差角度θ１は、９０度±（２〜３）度程度の範囲で変化することが好ましい。   In the present embodiment, as shown in FIG. 2, the sensor intersection angle θ1 between the first sensor direction β1 and the second sensor direction β2 is adjusted so that the control center C1 coincides with the center of gravity G1. Therefore, the sensor crossing angle θ1 is not necessarily 90 degrees. However, the sensor crossing angle θ1 is preferably changed in a range of about 90 ° ± (2-3) °.

また、本実施形態では、図２において、第１ＶＣＭ１３０による第１駆動方向α１と、第２ＶＣＭ１４０による第２駆動方向α２との駆動交差角度θ２は、９０度であり、センサ交差角度θ１とは必ずしも一致しない。駆動交差角度θ２を９０度とするのは、可動部１２０を固定部１１０に対してＸ軸−Ｙ軸平面内で自由な方向に効率的に移動させるためである。   Further, in the present embodiment, in FIG. 2, the driving crossing angle θ2 between the first driving direction α1 by the first VCM 130 and the second driving direction α2 by the second VCM 140 is 90 degrees, and does not necessarily coincide with the sensor crossing angle θ1. do not do. The reason why the driving intersection angle θ2 is 90 degrees is to move the movable unit 120 efficiently in a free direction within the X-axis-Y-axis plane with respect to the fixed unit 110.

ＶＣＭ１３０，１４０は、図２に示すように、Ｘ軸およびＹ軸平面において、補正レンズ群Ｌ４の光軸Ａ２０を通るＹ軸に対して、線対称な位置であって、これらの駆動方向α１およびα２とのそれぞれの交差角度θ３が、それぞれ駆動交差角度θ２の１／２となる位置に配置してある。このような配置関係にすることで、可動部１２０を固定部１１０に対してＸ軸−Ｙ軸平面内で自由な方向に効率的に素早く移動させることができる。   As shown in FIG. 2, the VCMs 130 and 140 are in a line-symmetrical position with respect to the Y-axis passing through the optical axis A20 of the correction lens unit L4 on the X-axis and Y-axis planes. Each intersection angle θ3 with α2 is arranged at a position that is half of the driving intersection angle θ2. With such an arrangement relationship, the movable unit 120 can be efficiently and quickly moved in a free direction within the X-axis-Y-axis plane with respect to the fixed unit 110.

ただし、この実施形態では、駆動交差角度θ２をセンサ交差角度θ１と略同じにしても良い。すなわち、第１ＶＣＭ１３０による第１駆動方向α１への可動部１２０の相対移動量をダイレクトに検出するためには、第１駆動方向α１と第１センサ方向β１とが略平行であることが好ましい。また、第２ＶＣＭ１４０による第２駆動方向α２への可動部１２０の相対移動量をダイレクトに検出するためには、第２駆動方向α２と第２センサ方向β２とが略平行であることが好ましい。そのため、駆動交差角度θ２は、センサ交差角度θ１と略同じにしても良い。   However, in this embodiment, the drive intersection angle θ2 may be substantially the same as the sensor intersection angle θ1. That is, in order to directly detect the relative movement amount of the movable unit 120 in the first drive direction α1 by the first VCM 130, it is preferable that the first drive direction α1 and the first sensor direction β1 are substantially parallel. In order to directly detect the relative movement amount of the movable unit 120 in the second drive direction α2 by the second VCM 140, it is preferable that the second drive direction α2 and the second sensor direction β2 are substantially parallel. Therefore, the drive intersection angle θ2 may be substantially the same as the sensor intersection angle θ1.

また、本実施形態では、図２に示すように、光軸Ａ２０と重心Ｇ１とが一致しているが、カメラ１の設計によっては困難な場合がある。そのような場合にも、本実施形態では、制御中心Ｃ１が、重心Ｇ１に一致するように、第１センサ方向β１と第２センサ方向β２とのセンサ交差角度θ１が調整してある。   In the present embodiment, as shown in FIG. 2, the optical axis A20 and the center of gravity G1 coincide with each other, but it may be difficult depending on the design of the camera 1. Even in such a case, in the present embodiment, the sensor intersection angle θ1 between the first sensor direction β1 and the second sensor direction β2 is adjusted so that the control center C1 coincides with the center of gravity G1.

なお、本発明では、光軸Ａ２０と重心Ｇ１とが一致していない場合において、制御中心Ｃ１が、光軸Ａ２０に一致するように、第１センサ方向β１と第２センサ方向β２とのセンサ交差角度θ１を調整してもよい。さらに本発明では、固定部１１０に対して可動部１２０が回転することを防止する機構を具備させても良い。   In the present invention, when the optical axis A20 and the center of gravity G1 do not coincide with each other, the sensor intersection between the first sensor direction β1 and the second sensor direction β2 so that the control center C1 coincides with the optical axis A20. The angle θ1 may be adjusted. Furthermore, in the present invention, a mechanism for preventing the movable portion 120 from rotating with respect to the fixed portion 110 may be provided.

また、上述した実施形態では、ホール素子１５２および１６２を具備するセンサ１５０および１６０で検出部を構成したが、それに限定されず、その他の位置センサであっても良い。さらに、上述した実施形態において、固定部１１０と可動部１２０とは逆でも良い。すなわち、固定部１１０に対して、マグネット１３２，１４２，１５１，１６１およびヨーク１３３，１４３を装着すると共に、可動部１２０に対して、コイル１３１，１４１およびホール素子１５２，１６２を装着しても良い。   In the above-described embodiment, the detection unit is configured by the sensors 150 and 160 including the Hall elements 152 and 162, but is not limited thereto, and other position sensors may be used. Furthermore, in the embodiment described above, the fixed portion 110 and the movable portion 120 may be reversed. That is, the magnets 132, 142, 151, 161 and the yokes 133, 143 may be attached to the fixed part 110, and the coils 131, 141 and the Hall elements 152, 162 may be attached to the movable part 120. .

さらに、本発明に係るブレ補正装置は、レンズ駆動方式のみでなく、ＣＣＤ駆動方式にも適用することができる。すなわち、補正レンズ群Ｌ４を固定部１１０に対して移動させるのではなく、ＣＣＤなどの撮像素子を、カメラのブレに応じて、固定部に対して移動させることによりタイプのブレ補正装置にも適用が可能である。そのようなＣＣＤ駆動方式のブレ補正装置でも、固定部と可動部とが設けられ、位置検出センサも具備されるからである。   Furthermore, the shake correction apparatus according to the present invention can be applied not only to the lens driving method but also to the CCD driving method. That is, instead of moving the correction lens group L4 with respect to the fixed portion 110, the image pickup device such as a CCD is also moved with respect to the fixed portion in accordance with the camera shake. Is possible. This is because even such a CCD driving type blur correction apparatus is provided with a fixed portion and a movable portion, and is also provided with a position detection sensor.

また、本発明のブレ補正装置は、レンズ鏡筒１ａを有するカメラ１のみでなく、レンズ鏡筒自体、スチルカメラ、ビデオカメラ、望遠鏡、顕微鏡などのその他の光学装置にも適用することができる。   The blur correction device of the present invention can be applied not only to the camera 1 having the lens barrel 1a but also to other optical devices such as the lens barrel itself, a still camera, a video camera, a telescope, and a microscope.

図１は本発明の一実施形態に係るブレ補正装置を具備するカメラの概略断面図である。FIG. 1 is a schematic cross-sectional view of a camera including a shake correction apparatus according to an embodiment of the present invention. 図２は図１に示すカメラ内におけるブレ補正装置のII−II線に沿う平面図である。FIG. 2 is a plan view taken along line II-II of the shake correction apparatus in the camera shown in FIG. 図３は図２に示すIII−III線に沿う概略断面図である。3 is a schematic cross-sectional view taken along the line III-III shown in FIG. 図４は図３に示すIV−IV線に沿う概略断面図である。4 is a schematic cross-sectional view taken along line IV-IV shown in FIG. 図５（Ａ）および図５（Ｂ）は制御中心位置と重心位置とが一致している場合における回転により生じる変位を示す概略図、図５（Ｃ）および図５（Ｄ）は制御中心位置と重心位置とが一致していない場合における回転により生じる変位を示す概略図である。5 (A) and 5 (B) are schematic diagrams showing displacement caused by rotation when the control center position and the gravity center position coincide with each other, and FIGS. 5 (C) and 5 (D) show the control center position. It is the schematic which shows the displacement which arises by rotation in case a gravity center position does not correspond.

符号の説明Explanation of symbols

１… カメラ
２… レンズ鏡筒
１１０… 固定部
１２０… 可動部
１３０，１４０… ボイスコイルモータ
１５０，１６０… 位置センサ
Ｇ１… 重心
Ｃ１… 制御中心 DESCRIPTION OF SYMBOLS 1 ... Camera 2 ... Lens barrel 110 ... Fixed part 120 ... Movable part 130,140 ... Voice coil motor 150,160 ... Position sensor G1 ... Center of gravity C1 ... Control center

Claims (9)

固定部材に対向する平面上を前記固定部材に対して相対移動可能な移動部材と、
前記移動部材に備えられ、前記移動部材の重心、又は、前記重心に近接した位置を通り前記平面と平行な第１方向に沿った磁界を形成する第１の磁石と、
前記移動部材に備えられ、前記移動部材の重心、又は、前記重心に近接した位置を通り前記平面と平行な第２方向に沿った磁界を形成する第２の磁石と、
前記固定部材に備えられ、前記第１の磁石の磁界を検出する第１の磁気検出素子と、
前記固定部材に備えられ、前記第２の磁石の磁界を検出する第２の磁気検出素子とを含むことを特徴とするブレ補正装置。 A moving member movable relative to the fixing member on a plane facing the fixing member;
A first magnet that is provided in the moving member and that forms a magnetic field along a first direction parallel to the plane passing through the center of gravity of the moving member or a position close to the center of gravity;
A second magnet that is provided in the moving member and that forms a magnetic field along a second direction that passes through the center of gravity of the moving member or a position close to the center of gravity and is parallel to the plane;
A first magnetic detection element provided in the fixing member for detecting a magnetic field of the first magnet;
A shake correction apparatus comprising: a second magnetic detection element that is provided in the fixing member and detects a magnetic field of the second magnet. 固定部材に対向する平面上を前記固定部材に対して相対移動可能な移動部材と、 前記移動部材の重心、又は、前記重心に近接した位置を通り前記平面と平行な第１方向に沿った前記固定部材と前記移動部材との相対移動を検出する第１の検出部と、
前記第１方向と交差し、前記移動部材の重心、又は、前記重心に近接した位置を通り前記平面と平行な第２方向に沿った前記固定部材と前記移動部材との相対移動を検出する第２の検出部とを含むことを特徴とするブレ補正装置。 A movable member that can move relative to the fixed member on a plane facing the fixed member; and a center of gravity of the movable member or a position close to the center of gravity along a first direction parallel to the plane. A first detector for detecting relative movement between the fixed member and the moving member;
A first detection unit that detects a relative movement between the fixed member and the moving member along a second direction that intersects the first direction and passes through the position of the center of gravity of the moving member or the position close to the center of gravity and parallel to the plane. And a blur correction device. 請求項１又は２に記載されたブレ補正装置であって、
前記平面と平行な第３方向に沿って前記固定部材と前記移動部材とを相対移動させる第１の駆動部と、
前記第３方向と交差し、前記平面と平行な第４方向に沿って前記固定部材と前記移動部材とを相対移動させる第２の駆動部とを含み、
前記第１方向と前記第２方向との交差角は、前記第３方向と前記第４方向との交差角とは異なることを特徴とするブレ補正装置。 The blur correction device according to claim 1 or 2,
A first drive unit that relatively moves the fixed member and the moving member along a third direction parallel to the plane;
A second drive unit that crosses the third direction and moves the fixed member and the moving member relative to each other along a fourth direction parallel to the plane;
The blur correction device according to claim 1, wherein an intersection angle between the first direction and the second direction is different from an intersection angle between the third direction and the fourth direction. 請求項１から請求項３までの何れか１項に記載されたブレ補正装置であって、
前記第３方向と前記第４方向との交差角は、９０度であることを特徴とするブレ補正装置。 The blur correction device according to any one of claims 1 to 3, wherein
The blur correction device according to claim 1, wherein an intersection angle between the third direction and the fourth direction is 90 degrees. 請求項１から請求項４までの何れか１項に記載されたブレ補正装置であって、
前記固定部材又は前記移動部材は、前記第１方向と前記第２方向との交点を制御中心として相対移動することを特徴とするブレ補正装置。 The blur correction device according to any one of claims 1 to 4, wherein
The shake correction apparatus according to claim 1, wherein the fixed member or the moving member relatively moves with an intersection of the first direction and the second direction as a control center. 請求項１から請求項５までの何れか１項に記載されたブレ補正装置であって、
前記移動部材は、像振れを補正するための光学系を含むことを特徴とするブレ補正装置。 The blur correction device according to any one of claims 1 to 5, wherein
The blur correction apparatus, wherein the moving member includes an optical system for correcting image blur. 請求項１から請求項５までの何れか１項に記載されたブレ補正装置であって、
前記移動部材は、光学系による像を撮像する撮像素子を含むことを特徴とするブレ補正装置。 The blur correction device according to any one of claims 1 to 5, wherein
The blur correction apparatus according to claim 1, wherein the moving member includes an image sensor that captures an image by an optical system. 請求項１から請求項７までの何れか１項に記載されたブレ補正装置であって、
前記第１の検出部は、前記第１方向に沿って形成された磁場を用いて前記固定部材と前記移動部材との相対移動を検出し、
前記第２の検出部は、前記第２方向に沿って形成された磁場を用いて前記固定部材と前記移動部材との相対移動を検出することを特徴とするブレ補正装置。 The blur correction device according to any one of claims 1 to 7, wherein
The first detection unit detects a relative movement between the fixed member and the moving member using a magnetic field formed along the first direction,
The blur correction device, wherein the second detection unit detects a relative movement between the fixed member and the moving member using a magnetic field formed along the second direction. 請求項１から請求項８までの何れか１項に記載されたブレ補正装置を備えたことを特徴とする光学装置。   An optical apparatus comprising the shake correction apparatus according to any one of claims 1 to 8.
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