JP6180554B2 - Lens drive device - Google Patents
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- JP6180554B2 JP6180554B2 JP2016000371A JP2016000371A JP6180554B2 JP 6180554 B2 JP6180554 B2 JP 6180554B2 JP 2016000371 A JP2016000371 A JP 2016000371A JP 2016000371 A JP2016000371 A JP 2016000371A JP 6180554 B2 JP6180554 B2 JP 6180554B2
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Description
本発明は、光軸に対して直交する方向に撮像光学系を移動させて像振れを補正するレンズ駆動装置に関する。 The present invention relates to a lens driving device that corrects image blur by moving an imaging optical system in a direction orthogonal to an optical axis.
従来、このような分野の技術として特許文献１がある。特許文献１には、コンパクトデジタルスチルカメラといったレンズ一体型の撮像装置などに適用可能な光学防振装置が開示されている。この光学防振装置は、防振レンズを保持するレンズ保持枠と、レンズ保持枠を光軸に直交する方向へ移動可能に支持するベース部材と、を備えている。レンズ保持枠とベース部材とにはそれぞれ、凹部としてのボール受け部が形成され、この凹部内にはレンズ保持枠の移動に伴って転動するボールが配置されている。 Conventionally, there is Patent Document 1 as a technology in such a field. Patent Document 1 discloses an optical image stabilizer that can be applied to a lens-integrated imaging device such as a compact digital still camera. This optical image stabilizer includes a lens holding frame that holds an anti-vibration lens and a base member that supports the lens holding frame so as to be movable in a direction perpendicular to the optical axis. Each of the lens holding frame and the base member is formed with a ball receiving portion as a recess, and a ball that rolls along with the movement of the lens holding frame is disposed in the recess.
特許文献１のようにボールでレンズ保持枠を支持する光学防振装置では、レンズ保持枠が中立位置にあるとき、ボールは凹部の略中央に位置している。このボールの中立位置は、ボールとベース部材又はボールとレンズ保持枠の間に生じる滑りや、光学防振装置の外部から加わる振動や衝撃などによりずれることがある。そして、ボールの中立位置がずれた状態でレンズ保持枠が移動すると、ボール保持部の内壁にボールが当接する場合がある。 In an optical vibration isolator that supports a lens holding frame with a ball as in Patent Document 1, when the lens holding frame is in a neutral position, the ball is positioned substantially at the center of the recess. The neutral position of the ball may be shifted due to slippage between the ball and the base member or between the ball and the lens holding frame, or vibration or impact applied from the outside of the optical image stabilizer. When the lens holding frame moves with the neutral position of the ball shifted, the ball may come into contact with the inner wall of the ball holding portion.
内壁にボールが接触した状態では、内壁とボールと間の摩擦力が大きくなる。摩擦力が大きくなるとレンズ保持枠を滑らかに動かすためには大きい駆動力を必要とするが、小型化された光学防振装置では、駆動力が小さく目標移動量に対して実際の移動量が相違することがある。従って、追従ずれが大きくなるおそれがある。 When the ball is in contact with the inner wall, the frictional force between the inner wall and the ball is increased. When the frictional force increases, a large driving force is required to move the lens holding frame smoothly. However, in the miniaturized optical image stabilizer, the driving force is small and the actual moving amount differs from the target moving amount. There are things to do. Therefore, there is a possibility that the tracking deviation becomes large.
そこで、本発明は、追従ずれを低減可能なレンズ駆動装置を提供することを目的とする。 SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a lens driving device that can reduce the tracking error.
本発明に係るレンズ駆動装置は、枠体と、枠体に配置され、光軸に対して直交する平面内で移動する可動部材と、枠体と可動部材とに配置され、光軸に対して直交する方向に可動部材を移動させる可動部材用駆動手段と、枠体に対して可動部材を平面内で移動可能に支持する支持手段と、を備え、支持手段は、可動部材を支持する球状体と、枠体又は可動部材に配置され、球状体を取り囲んで、平面内での球状体の移動を規制する筒状部材と、を有し、筒状部材の内周面には、潤滑めっき層が形成されている。 A lens driving device according to the present invention is disposed on a frame, a movable member that is disposed on the frame and moves in a plane orthogonal to the optical axis, and the frame and the movable member. The movable member driving means for moving the movable member in the orthogonal direction and the support means for movably supporting the movable member in a plane with respect to the frame body, the support means is a spherical body that supports the movable member. And a cylindrical member that is disposed on the frame body or the movable member, surrounds the spherical body, and restricts the movement of the spherical body in a plane, and a lubricating plating layer is formed on the inner peripheral surface of the cylindrical member. Is formed.
本発明に係るレンズ駆動装置では、可動部材を支持する球状体が筒状部材に取り囲まれ、可動部材の移動に伴って転動した球状体が筒状部材の内周面に当接することにより、球状体の移動が規制される。 In the lens driving device according to the present invention, the spherical body that supports the movable member is surrounded by the cylindrical member, and the spherical body that rolls along with the movement of the movable member abuts on the inner peripheral surface of the cylindrical member, The movement of the spherical body is restricted.
球状体が当接する筒状部材は、枠体及び可動部材とは別体であるため、枠体及び可動部材の構成材料とは別の特性を有する材料を選択して筒状部材を構成することができる。これによって、より硬質な樹脂材や金属材を選択することができ、衝撃等により球状体が筒状部材に衝突したとき、筒状部材の内周面に凹みが発生することを抑制できる。これにより、内周面の状態が平滑に保たれるため、内周面上における球状体の転がり抵抗の増加を抑制できる。従って、目標移動量に対して実際の移動量の減少が抑制され、追従ずれを低減することができる。 Since the cylindrical member with which the spherical body abuts is separate from the frame and the movable member, the cylindrical member is configured by selecting a material having characteristics different from those of the frame and the movable member. Can do. Thereby, a harder resin material or metal material can be selected, and when the spherical body collides with the cylindrical member due to impact or the like, it is possible to suppress the occurrence of a dent on the inner peripheral surface of the cylindrical member. Thereby, since the state of an inner peripheral surface is kept smooth, the increase in rolling resistance of the spherical body on an inner peripheral surface can be suppressed. Accordingly, a decrease in the actual movement amount with respect to the target movement amount is suppressed, and the tracking deviation can be reduced.
また、球状体が当接する筒状部材の内周面には、潤滑めっき層が形成されている。この潤滑めっき層によれば、内周面の摩擦係数が小さくなるため、球状体が筒状部材の内周面に対して滑るように転動する状態において、すべり抵抗の増加を抑制できる。従って、目標移動量に対する実際の移動量の減少が抑制され、追従ずれを低減することができる。 In addition, a lubricating plating layer is formed on the inner peripheral surface of the cylindrical member with which the spherical body abuts. According to this lubricating plating layer, since the friction coefficient of the inner peripheral surface becomes small, an increase in slip resistance can be suppressed in a state where the spherical body rolls so as to slide relative to the inner peripheral surface of the cylindrical member. Therefore, a decrease in the actual movement amount with respect to the target movement amount is suppressed, and the follow-up deviation can be reduced.
また、球状体と筒状部材とは、非磁性材料からなる。 The spherical body and the cylindrical member are made of a nonmagnetic material.
この構成によれば、可動部材駆動手段の影響を受け難くなり、可動部材及び球状体をより滑らかに動かすことが可能となる。従って、追従ずれを一層低減することができる。 According to this structure, it becomes difficult to receive the influence of a movable member drive means, and it becomes possible to move a movable member and a spherical body more smoothly. Accordingly, the tracking error can be further reduced.
また、筒状部材の外周面には、周方向に凹状の抜け止め部が形成されている。 Further, a concave retaining portion is formed in the circumferential direction on the outer peripheral surface of the cylindrical member.
この構成によれば、抜け止め部に接着剤あるいは樹脂材料を保持できるため、枠体又は可動部材に対する筒状部材の取付強度を高めることができる。 According to this configuration, since the adhesive or the resin material can be held in the retaining portion, the attachment strength of the tubular member to the frame body or the movable member can be increased.
本発明によれば、レンズ駆動装置の追従ずれを低減することができる。 According to the present invention, it is possible to reduce the tracking deviation of the lens driving device.
レンズ駆動装置は、デジタルスチルカメラや携帯電話機或いはスマートフォン等に適用される装置であり、レンズを有する撮像光学系と光が結像される撮像素子との間の相対位置を変化させて手振れを補正する。以下の説明では、固定された撮像素子に対して撮像光学系を移動させる方式を採用したレンズ駆動装置を例に説明する。 A lens driving device is a device applied to a digital still camera, a mobile phone, a smartphone, or the like, and corrects camera shake by changing the relative position between an imaging optical system having a lens and an imaging element on which light is imaged. To do. In the following description, a lens driving device that employs a method of moving an imaging optical system with respect to a fixed imaging element will be described as an example.
図１に示されるように、レンズ駆動装置１は、撮像素子（不図示）であるＣＣＤ［Charge Coupled Device］イメージセンサや、ＣＭＯＳ［Complementary Metal Oxide Semiconductor］イメージセンサの前方に配置されて利用される。手振れ補正機能を有するレンズ駆動装置１は、枠体をなすボックス状のベース部材２と、レンズ（不図示）の焦点調整を行う撮像光学系３と、撮像光学系３を収容したベース部材２を閉鎖させる蓋部材４と、を備えている。 As shown in FIG. 1, the lens driving device 1 is disposed and used in front of a CCD (Charge Coupled Device) image sensor or a CMOS (Complementary Metal Oxide Semiconductor) image sensor, which is an image sensor (not shown). . A lens driving device 1 having a camera shake correction function includes a box-shaped base member 2 that forms a frame, an imaging optical system 3 that performs focus adjustment of a lens (not shown), and a base member 2 that houses the imaging optical system 3. And a lid member 4 to be closed.
ベース部材２は、直方体箱状の部材であり、レンズの光軸Ｃを中心とする矩形の開口部２ａと、光軸Ｃに直交して延在する支持面２ｂとを有している。この支持面２ｂには、レンズを透過した光が通過する開口部２ｃが光軸Ｃを中心にして設けられている。 The base member 2 is a rectangular parallelepiped box-like member, and has a rectangular opening 2a centered on the optical axis C of the lens and a support surface 2b extending perpendicular to the optical axis C. The support surface 2b is provided with an opening 2c through which light transmitted through the lens passes, with the optical axis C as the center.
撮像光学系３は、レンズを光軸Ｃの方向に移動させる焦点調整機構６と、焦点調整機構６を光軸Ｃと直交する平面内で移動させる手振れ補正機構７とを有している。焦点調整機構６は、単一又は複数のレンズ群（不図示）を保持するためのレンズ保持枠８と、レンズ保持枠８を光軸Ｃの方向に付勢する板バネ（不図示）と、レンズ保持枠８を光軸Ｃの方向に駆動する４個のレンズ枠用駆動手段１１とを有している。焦点調整機構６は、レンズ枠用駆動手段１１によりレンズ保持枠８を光軸Ｃの方向に移動させて、レンズの焦点を調整する。なお、焦点調整機構６は、画角を決定するズーム機構とすることもできる。 The imaging optical system 3 includes a focus adjustment mechanism 6 that moves the lens in the direction of the optical axis C, and a camera shake correction mechanism 7 that moves the focus adjustment mechanism 6 in a plane orthogonal to the optical axis C. The focus adjustment mechanism 6 includes a lens holding frame 8 for holding a single lens group or a plurality of lens groups (not shown), a plate spring (not shown) for urging the lens holding frame 8 in the direction of the optical axis C, Four lens frame driving means 11 for driving the lens holding frame 8 in the direction of the optical axis C are provided. The focus adjusting mechanism 6 adjusts the focus of the lens by moving the lens holding frame 8 in the direction of the optical axis C by the lens frame driving means 11. The focus adjustment mechanism 6 may be a zoom mechanism that determines the angle of view.
手振れ補正機構７は、焦点調整機構６を保持して光軸Ｃに対して直交する平面内で移動する可動部材１２と、ベース部材２内における可動部材１２の移動を規制する規制手段１３（図２参照）と、可動部材１２を移動させる可動部材用駆動手段１４と、ベース部材２に対して可動部材１２を移動可能に支持する支持手段１６と、を有している。手振れ補正機構７は、可動部材用駆動手段１４により焦点調整機構６を光軸Ｃと直交する平面内で移動させて手振れを補正する。 The camera shake correction mechanism 7 holds the focus adjustment mechanism 6 and moves in a plane orthogonal to the optical axis C, and a restricting means 13 that restricts movement of the movable member 12 in the base member 2 (FIG. 2), a movable member driving means 14 for moving the movable member 12, and a support means 16 for movably supporting the movable member 12 with respect to the base member 2. The camera shake correction mechanism 7 corrects camera shake by moving the focus adjustment mechanism 6 in a plane orthogonal to the optical axis C by the movable member driving means 14.
図３に示されるように、可動部材１２は、焦点調整機構６を保持するものであり、支持手段１６により支持された状態でベース部材２の内部に収容されている。可動部材１２は、光軸Ｃを中心とする円形の開口部１２ａを有する直方体状の部材である。 As shown in FIG. 3, the movable member 12 holds the focus adjustment mechanism 6 and is accommodated inside the base member 2 in a state of being supported by the support means 16. The movable member 12 is a rectangular parallelepiped member having a circular opening 12a centered on the optical axis C.
図２に示されるように、規制手段１３は、光軸Ｃに対して直交する平面内で可動部材１２の移動を規制するものであり、光軸Ｃに対して直交する方向に移動する直線移動軌跡Ｔ１と、直線移動軌跡Ｔ１上の点を回転中心ＲＣとして回転する回転移動軌跡Ｔ２との２個の移動軌跡により可動部材１２の移動を規制する。 As shown in FIG. 2, the regulating means 13 regulates the movement of the movable member 12 in a plane orthogonal to the optical axis C, and moves linearly in a direction orthogonal to the optical axis C. The movement of the movable member 12 is restricted by two movement loci, a trajectory T1 and a rotational movement trajectory T2 that rotates about a point on the linear movement trajectory T1 as the rotation center RC.
規制手段１３は、ベース部材２に固定されたピン１７と、可動部材１２に設けられた長溝１８とを有している。ピン１７は、光軸Ｃの方向に延びる円柱状の部材である。ピン１７の基端は、支持面２ｂの隅部に取り付けられている。 The restricting means 13 has a pin 17 fixed to the base member 2 and a long groove 18 provided in the movable member 12. The pin 17 is a columnar member extending in the direction of the optical axis C. The base end of the pin 17 is attached to the corner of the support surface 2b.
可動部材１２の長溝１８は、直線移動軌跡Ｔ１の方向を設定するものであり、対角線Ｌ１に沿って延びた断面矩形状をなす凹部である。長溝１８は、ピン１７が取り付けられた位置に対応するように形成されている。長溝１８の長手方向と直交する方向の幅は、ピン１７が長溝１８の側面に対して摺動可能な幅に設定されている。また、長溝１８は、長溝１８の底面にピン１７の上端面が接触しない深さになっている。 The long groove 18 of the movable member 12 sets the direction of the linear movement locus T1, and is a recess having a rectangular cross section extending along the diagonal line L1. The long groove 18 is formed so as to correspond to the position where the pin 17 is attached. The width in the direction orthogonal to the longitudinal direction of the long groove 18 is set to a width that allows the pin 17 to slide with respect to the side surface of the long groove 18. Further, the long groove 18 has such a depth that the upper end surface of the pin 17 does not contact the bottom surface of the long groove 18.
規制手段１３によれば、可動部材１２は、直線移動軌跡Ｔ１の方向へ案内されて直線移動できると共に、直線移動軌跡Ｔ１上に配置されるピン１７を回転中心ＲＣとする回転移動軌跡Ｔ２に沿って回転できる。つまり、可動部材１２の位置は、１個の動径と１個の偏角とに基づく円座標系で表現されていることに相当する。この直線移動と回転との組み合わせによれば、支持面２ｂ上の意図しない点を回転中心ＲＣとした不要な回転の発生を抑制できるので、精度のよい手振れ補正を行うことができる。更に、規制手段１３によれば、不要な回転による可動部材１２の移動を補正するためのアクチュエータなどが不要であるため、レンズ駆動装置１の部品点数を増やすことなく小型化に寄与する。 According to the restricting means 13, the movable member 12 is guided in the direction of the linear movement locus T1 and can move linearly, and along the rotational movement locus T2 having the pin 17 arranged on the linear movement locus T1 as the rotation center RC. Can be rotated. That is, the position of the movable member 12 corresponds to being expressed in a circular coordinate system based on one moving radius and one declination. According to this combination of linear movement and rotation, it is possible to suppress the occurrence of unnecessary rotation with an unintended point on the support surface 2b as the rotation center RC, so that accurate camera shake correction can be performed. Furthermore, according to the restricting means 13, an actuator for correcting the movement of the movable member 12 due to unnecessary rotation is not necessary, which contributes to downsizing without increasing the number of parts of the lens driving device 1.
なお、規制手段１３の長溝１８の断面は矩形状であるが、Ｖ字状であってもよい。また、ピン１７が挿入される部分は溝に限定されず、断面矩形状をなす貫通穴であってもよい。さらに、ピン１７は、ベース部材２と一体に成形されてもよく、ピン１７に代えてベース部材２の支持面２ｂに設けられた断面半球状の凸部であってもよい。 In addition, although the cross section of the long groove 18 of the control means 13 is rectangular, it may be V-shaped. Further, the portion into which the pin 17 is inserted is not limited to the groove, and may be a through hole having a rectangular cross section. Further, the pin 17 may be formed integrally with the base member 2 or may be a hemispherical cross section provided on the support surface 2 b of the base member 2 instead of the pin 17.
可動部材用駆動手段１４は、光軸Ｃと直交する方向に可動部材１２を駆動するための第１〜第３のアクチュエータ１９Ａ〜１９Ｃを有している。第１のアクチュエータ１９Ａは、対角線Ｌ１上において、長溝１８に対して光軸Ｃを挟んで対向するように配置されている。第１のアクチュエータ１９Ａは、対角線Ｌ１に沿った方向成分を有する駆動力を可動部材１２に印加している。 The movable member driving means 14 has first to third actuators 19A to 19C for driving the movable member 12 in a direction orthogonal to the optical axis C. The first actuator 19A is disposed on the diagonal line L1 so as to face the long groove 18 with the optical axis C interposed therebetween. The first actuator 19A applies a driving force having a directional component along the diagonal line L1 to the movable member 12.
第２のアクチュエータ１９Ｂと第３のアクチュエータ１９Ｃとは、対角線Ｌ１と直交する別の対角線Ｌ２上に配置されている。第２のアクチュエータ１９Ｂと第３のアクチュエータ１９Ｃとは、光軸Ｃを挟んで互いに対向して配置されている。第２のアクチュエータ１９Ｂと第３のアクチュエータ１９Ｃとは、対角線Ｌ２に沿った方向成分を有する駆動力を可動部材１２に印加している。 The second actuator 19B and the third actuator 19C are disposed on another diagonal line L2 orthogonal to the diagonal line L1. The second actuator 19B and the third actuator 19C are arranged to face each other with the optical axis C interposed therebetween. The second actuator 19B and the third actuator 19C apply a driving force having a directional component along the diagonal L2 to the movable member 12.
第１〜第３のアクチュエータ１９Ａ〜１９Ｃは、それぞれ同様の構成を有するため、以下、第１のアクチュエータ１９Ａの構成を例に説明する。第１のアクチュエータ１９Ａは、可動部材１２に配置されたマグネット２１と、ベース部材２に配置されたコイル２２とを有している。マグネット２１とコイル２２とは、互いに対面するように配置されている。 Since the first to third actuators 19A to 19C have the same configuration, the configuration of the first actuator 19A will be described below as an example. The first actuator 19 </ b> A includes a magnet 21 disposed on the movable member 12 and a coil 22 disposed on the base member 2. The magnet 21 and the coil 22 are arranged so as to face each other.
なお、第１のアクチュエータ１９Ａは、一方がマグネット２１側に配置され、他方がコイル２２側に配置された一対のヨーク板（不図示）を有していてもよい。このような構成によれば、マグネット２１及びコイル２２の磁路が確保される。また、コイル２２が無通電状態であっても、マグネット２１とヨーク板との間で磁気的引力が作用するため、可動部材１２の位置が定位置に維持される。 Note that the first actuator 19A may have a pair of yoke plates (not shown) in which one is disposed on the magnet 21 side and the other is disposed on the coil 22 side. According to such a structure, the magnetic path of the magnet 21 and the coil 22 is ensured. Even when the coil 22 is in a non-energized state, a magnetic attractive force acts between the magnet 21 and the yoke plate, so that the position of the movable member 12 is maintained at a fixed position.
支持手段１６は、光軸Ｃと直交する方向に可動部材１２を移動可能に支持するための３個の第１〜第３の支持部２３Ａ〜２３Ｃを有している。第１〜第３の支持部２３Ａ〜２３Ｃは、ベース部材２の開口部２ｃを囲むように９０°以上の位相角をもって配置され、可動部材１２を三点支持している。より詳細には、第１及び第２の支持部２３Ａ，２３Ｂは、対角線Ｌ１を挟んで略線対称となるように、第１の支持部２３Ａが第１のアクチュエータ１９Ａと第３のアクチュエータ１９Ｃとの間に配置され、第２の支持部２３Ｂが第１のアクチュエータ１９Ａと第２のアクチュエータ１９Ｂとの間に配置されている。また、第３の支持部２３Ｃは、対角線Ｌ１上において、開口部１２ａと規制手段１３との間に配置されている。 The support means 16 has three first to third support portions 23A to 23C for supporting the movable member 12 so as to be movable in a direction orthogonal to the optical axis C. The first to third support portions 23A to 23C are arranged with a phase angle of 90 ° or more so as to surround the opening 2c of the base member 2, and support the movable member 12 at three points. More specifically, the first support portion 23A includes the first actuator 19A and the third actuator 19C so that the first and second support portions 23A and 23B are substantially line symmetrical with respect to the diagonal line L1. The second support portion 23B is disposed between the first actuator 19A and the second actuator 19B. Further, the third support portion 23C is disposed between the opening 12a and the restricting means 13 on the diagonal line L1.
第１〜第３の支持部２３Ａ〜２３Ｃは、互いに同様の構成を有するため、第１の支持部２３Ａを例に具体的な構成を説明する。 Since the first to third support portions 23A to 23C have the same configuration, a specific configuration will be described by taking the first support portion 23A as an example.
図３に示されるように、第１の支持部２３Ａは、一方が可動部材１２に取り付けられ他方がベース部材２に取り付けられた一対の滑り板２４と、一対の滑り板２４に挟み込まれた球状体２６と、球状体２６を取り囲む断面円形の筒状部材２７とを有している。 As shown in FIG. 3, the first support portion 23 </ b> A includes a pair of sliding plates 24, one attached to the movable member 12 and the other attached to the base member 2, and a spherical shape sandwiched between the pair of sliding plates 24. It has a body 26 and a cylindrical member 27 having a circular cross section surrounding the spherical body 26.
滑り板２４は、オーステナイト系ステンレス鋼といった非磁性の金属製の板状部材である。滑り板２４は、可動部材１２又はベース部材２に接着固定される取付面２４ａと、取付面２４ａの反対側であり球状体２６と接触する接触面２４ｂとを有している。この接触面２４ｂには、摩擦係数を低減し、且つ帯電を防止するためのフッ素を含む潤滑めっき層Ｍ１が形成されている。接触面２４ｂの表面粗さは、算術平均粗さで０．１５μｍ未満である。この接触面２４ｂの表面粗さと球状体２６の表面粗さとを比較すると、球状体２６の表面粗さが接触面２４ｂの表面粗さよりも小さくなっている。 The sliding plate 24 is a non-magnetic metal plate-like member such as austenitic stainless steel. The sliding plate 24 has a mounting surface 24 a that is bonded and fixed to the movable member 12 or the base member 2, and a contact surface 24 b that is opposite to the mounting surface 24 a and contacts the spherical body 26. On this contact surface 24b, a lubricating plating layer M1 containing fluorine for reducing the friction coefficient and preventing charging is formed. The surface roughness of the contact surface 24b is an arithmetic average roughness of less than 0.15 μm. When the surface roughness of the contact surface 24b is compared with the surface roughness of the spherical body 26, the surface roughness of the spherical body 26 is smaller than the surface roughness of the contact surface 24b.
球状体２６は、タングステンといった非磁性の金属製の球体である。球状体２６は、ＪＩＳ Ｂ １５０１に規定されている等級Ｇ２０に対応し、真球度が０．５μｍである。球状体２６の表面粗さは、算術平均粗さで０．１μｍ以下であり、より好ましくは０．０１μｍ以下である。 The spherical body 26 is a spherical body made of a nonmagnetic metal such as tungsten. The spherical body 26 corresponds to the grade G20 defined in JIS B 1501, and has a sphericity of 0.5 μm. The surface roughness of the spherical body 26 is an arithmetic average roughness of 0.1 μm or less, more preferably 0.01 μm or less.
図３及び図４に示されるように、筒状部材２７は、球状体２６を取り囲んで、光軸Ｃに直交する平面内での球状体２６の移動を規制するものである。筒状部材２７は、ベース部材２の支持面２ｂに形成された凹部２ｄにはめ込まれて、ベース部材２に対して接着剤ＡＨにより接着固定されている。筒状部材２７は、内径が球状体２６の直径よりも大きくなっており、軸方向の長さが球状体２６の直径よりも短くなっているため、筒状部材２７内において球状体２６が滑り板２４上で転動可能になっている。また、筒状部材２７は、初期状態において、光軸Ｃの方向における筒状部材２７の中央が、光軸Ｃの方向における球状体２６の中央と略一致するように配置されている。 As shown in FIGS. 3 and 4, the cylindrical member 27 surrounds the spherical body 26 and restricts the movement of the spherical body 26 in a plane orthogonal to the optical axis C. The cylindrical member 27 is fitted into a recess 2 d formed on the support surface 2 b of the base member 2, and is bonded and fixed to the base member 2 with an adhesive AH. Since the cylindrical member 27 has an inner diameter larger than the diameter of the spherical body 26 and an axial length shorter than the diameter of the spherical body 26, the spherical body 26 slips in the cylindrical member 27. It can roll on the plate 24. In addition, the cylindrical member 27 is disposed so that the center of the cylindrical member 27 in the direction of the optical axis C substantially coincides with the center of the spherical body 26 in the direction of the optical axis C in the initial state.
筒状部材２７は、タングステンといった非磁性でありベース部材２を構成する樹脂材料よりも硬質な金属製の部材である。この筒状部材２７の内周面２７ａ及び外周面２７ｂには、滑り板２４と同様に、摩擦係数を低減し且つ帯電を防止するためのフッ素を含む潤滑めっき層Ｍ２が形成されている。また、筒状部材２７の外周面２７ｂには、接着剤ＡＨを保持するための溝状の接着剤溜まり（抜け止め部）ＡＣが形成されている。筒状部材２７は、凹部２ｄへのはめ込みと、接着剤溜まりＡＣに保持された接着剤ＡＨとによりベース部材２に対して固定されている。 The tubular member 27 is a non-magnetic metal member such as tungsten that is harder than the resin material constituting the base member 2. On the inner peripheral surface 27a and the outer peripheral surface 27b of the cylindrical member 27, similarly to the sliding plate 24, a lubricating plating layer M2 containing fluorine for reducing the friction coefficient and preventing charging is formed. Further, on the outer peripheral surface 27b of the cylindrical member 27, a groove-like adhesive reservoir (a retaining portion) AC for holding the adhesive AH is formed. The cylindrical member 27 is fixed to the base member 2 by fitting into the recess 2d and the adhesive AH held in the adhesive reservoir AC.
図１に示されるように、蓋部材４は、ベース部材２の開口側の縁部に固定され、光軸Ｃを中心とする円形の開口部を有する板状の部材である。蓋部材４には、磁場検出素子であるホール素子２８が配置されている。ホール素子２８は、可動部材１２に配置されたレンズ枠用駆動手段１１のマグネットの磁界を検知する。これらのホール素子２８は互いに９０度の位相角をもって配置されているので、光軸Ｃと直交する平面内における可動部材１２の位置を検出できる。 As shown in FIG. 1, the lid member 4 is a plate-like member that is fixed to the edge of the base member 2 on the opening side and has a circular opening centered on the optical axis C. The lid member 4 is provided with a hall element 28 that is a magnetic field detection element. The hall element 28 detects the magnetic field of the magnet of the lens frame driving means 11 disposed on the movable member 12. Since these Hall elements 28 are arranged with a phase angle of 90 degrees, the position of the movable member 12 in the plane orthogonal to the optical axis C can be detected.
次に、レンズ駆動装置１の動作について説明する。レンズ駆動装置１が組み込まれた機器（例えば携帯電話機のカメラ）で撮影しているときに手振れが発生すると、光軸Ｃの位置が変化することがある。 Next, the operation of the lens driving device 1 will be described. If camera shake occurs when photographing with a device (for example, a camera of a mobile phone) in which the lens driving device 1 is incorporated, the position of the optical axis C may change.
この場合、ジャイロセンサなどのセンサが手振れを検知し、制御手段（不図示）は、撮像素子上における光軸Ｃの位置が所定の位置に維持されるように手振れ補正機構７を駆動させるための制御信号を第１〜第３のアクチュエータ１９Ａ〜１９Ｃに出力する。この場合、図２に示されるように、第１のアクチュエータ１９Ａは、制御信号を受信すると駆動力を発生させ、可動部材１２を直線移動軌跡Ｔ１の方向に直線移動させる。第２のアクチュエータ１９Ｂと第３のアクチュエータ１９Ｃは、制御信号を受信すると駆動力を発生させ、可動部材１２を回転移動軌跡Ｔ２の方向に回転させる。 In this case, a sensor such as a gyro sensor detects camera shake, and a control unit (not shown) drives the camera shake correction mechanism 7 so that the position of the optical axis C on the image sensor is maintained at a predetermined position. A control signal is output to the first to third actuators 19A to 19C. In this case, as shown in FIG. 2, when the first actuator 19A receives the control signal, the first actuator 19A generates a driving force and linearly moves the movable member 12 in the direction of the linear movement locus T1. The second actuator 19B and the third actuator 19C generate a driving force when receiving the control signal, and rotate the movable member 12 in the direction of the rotational movement locus T2.
この直線移動及び回転により、光軸Ｃの位置が所定の位置に移動する。このとき、可動部材１２は、規制手段１３により移動が規制され、直線移動による１個の自由度と、回転による１個の自由度とを合計した２個の自由度を有している。このため、可動部材１２は、光軸Ｃの位置を所定範囲内の所望の位置に移動させることができる。この移動により、撮像素子（例えばＣＭＯＳ）上における光軸Ｃの位置が所定の位置に維持され、手振れが補正される。 By this linear movement and rotation, the position of the optical axis C moves to a predetermined position. At this time, the movement of the movable member 12 is restricted by the restricting means 13, and has two degrees of freedom that is a total of one degree of freedom by linear movement and one degree of freedom by rotation. For this reason, the movable member 12 can move the position of the optical axis C to a desired position within a predetermined range. By this movement, the position of the optical axis C on the image sensor (for example, CMOS) is maintained at a predetermined position, and camera shake is corrected.
手振れ補正中における支持手段１６の動作について、第１の支持部２３Ａを例に説明する。図３に示されるように、初期状態において球状体２６は、筒状部材２７の略中央に配置され、球状体２６と筒状部材２７の内周面２７ａの間には所定の隙間が形成されている。ここで、レンズ駆動装置１の外部から振動や衝撃が印加された場合等に、球状体２６が筒状部材２７の中央からずれた位置にあり、内周面２７ａに接触することがある。 The operation of the support means 16 during camera shake correction will be described using the first support portion 23A as an example. As shown in FIG. 3, in the initial state, the spherical body 26 is disposed substantially at the center of the cylindrical member 27, and a predetermined gap is formed between the spherical body 26 and the inner peripheral surface 27 a of the cylindrical member 27. ing. Here, when a vibration or impact is applied from the outside of the lens driving device 1, the spherical body 26 is located at a position shifted from the center of the cylindrical member 27 and may come into contact with the inner peripheral surface 27 a.
図５（ａ）に示されるように、球状体２６が内周面２７ａに接触した状態からさらに可動部材１２が、光軸Ｃに直交する矢印Ｒ１の方向に移動する状態が想定し得る。 As shown in FIG. 5A, it can be assumed that the movable member 12 further moves in the direction of the arrow R1 perpendicular to the optical axis C from the state in which the spherical body 26 is in contact with the inner peripheral surface 27a.
図５（ａ）に示される状態では、可動部材１２側の滑り板２４上を球状体２６が滑らずに移動する場合、換言すると可動部材１２側の滑り板２４上を球状体２６が転がるように移動する場合がある。転がり移動における抵抗力は、球状体２６及び滑り板２４の表面形状や、表面粗さ及び硬さ等に基づく転がり抵抗による。 In the state shown in FIG. 5A, when the spherical body 26 moves without sliding on the sliding plate 24 on the movable member 12 side, in other words, the spherical body 26 rolls on the sliding plate 24 on the movable member 12 side. May move to. The resistance force in rolling movement depends on the rolling resistance based on the surface shape of the spherical body 26 and the sliding plate 24, the surface roughness, the hardness, and the like.
また、図５（ａ）に示される状態では、可動部材１２側の滑り板２４が球状体２６上を滑るように移動する場合がある。滑り移動による抵抗力は、球状体２６及び滑り板２４の接触面２４ｂ表面形状、表面粗さ及び摩擦係数等に基づく球状体２６に対する滑り板２４の滑り抵抗による。 Further, in the state shown in FIG. 5A, the sliding plate 24 on the movable member 12 side may move so as to slide on the spherical body 26. The resistance force due to the sliding movement is due to the sliding resistance of the sliding plate 24 against the spherical body 26 based on the surface shape, surface roughness, friction coefficient, and the like of the spherical body 26 and the sliding plate 24.
さらに、別の状態として、図５（ｂ）に示されるように、球状体２６が内周面２７ａに接触した状態において、可動部材１２側の滑り板２４の移動に伴い、球状体２６が内周面２７ａに沿って円弧状の軌跡を描くように矢印Ｒ２の方向へ移動する状態が想定し得る。 Furthermore, as another state, as shown in FIG. 5B, in a state where the spherical body 26 is in contact with the inner peripheral surface 27a, the spherical body 26 is moved along with the movement of the sliding plate 24 on the movable member 12 side. A state of moving in the direction of the arrow R2 so as to draw an arc-shaped trajectory along the peripheral surface 27a can be assumed.
この状態では、球状体２６が内周面２７ａ上を転がるように移動する場合がある。転がり移動における抵抗力は、球状体２６及び内周面２７ａの表面形状や表面粗さ等に基づく転がり抵抗による。 In this state, the spherical body 26 may move so as to roll on the inner peripheral surface 27a. The resistance force in the rolling movement is due to the rolling resistance based on the surface shape and surface roughness of the spherical body 26 and the inner peripheral surface 27a.
また、球状体２６が内周面２７ａ上を滑るように移動する場合がある。滑り移動における抵抗力は、球状体２６及び内周面２７ａの表面形状、表面粗さ及び摩擦係数等に基づく滑り抵抗による。 Further, the spherical body 26 may move so as to slide on the inner peripheral surface 27a. The resistance force in the sliding movement is due to the sliding resistance based on the surface shape, surface roughness, friction coefficient, and the like of the spherical body 26 and the inner peripheral surface 27a.
上述のレンズ駆動装置１では、可動部材１２を支持する球状体２６が筒状部材２７に取り囲まれ、可動部材１２の移動に伴って転動した球状体２６が筒状部材２７の内周面２７ａに当接することにより、球状体２６の移動が規制される。 In the lens driving device 1 described above, the spherical body 26 that supports the movable member 12 is surrounded by the cylindrical member 27, and the spherical body 26 that rolls as the movable member 12 moves is the inner peripheral surface 27 a of the cylindrical member 27. The movement of the spherical body 26 is restricted.
球状体２６が当接する筒状部材２７は、ベース部材２及び可動部材１２とは別体であるため、ベース部材２及び可動部材１２の構成材料とは別の特性を有する材料を選択して筒状部材２７を構成することができる。これによって、より硬質なタングステンといった金属材を選択することができ、衝撃等により球状体２６が筒状部材２７に衝突したとき、筒状部材２７の内周面２７ａに凹みが発生することを抑制できる。これにより、内周面２７ａの状態が平滑に保たれるため、内周面２７ａ上における球状体２６の転がり抵抗の増加を抑制できる。従って、目標移動量に対する実際の移動量の減少が抑制され、追従ずれを低減することができる。 Since the cylindrical member 27 with which the spherical body 26 abuts is a separate body from the base member 2 and the movable member 12, a material having characteristics different from those of the constituent materials of the base member 2 and the movable member 12 is selected. The shaped member 27 can be configured. As a result, a harder metal material such as tungsten can be selected, and when the spherical body 26 collides with the cylindrical member 27 due to an impact or the like, it is possible to prevent the inner peripheral surface 27a of the cylindrical member 27 from being depressed. it can. Thereby, since the state of the inner peripheral surface 27a is kept smooth, an increase in the rolling resistance of the spherical body 26 on the inner peripheral surface 27a can be suppressed. Therefore, a decrease in the actual movement amount with respect to the target movement amount is suppressed, and the follow-up deviation can be reduced.
また、球状体２６が当接する筒状部材２７の内周面２７ａには、潤滑めっき層Ｍ２が形成されている。この潤滑めっき層Ｍ２によれば、内周面２７ａの摩擦係数が小さくなるため、球状体２６が筒状部材２７の内周面２７ａに対して滑るように転動する状態において、すべり抵抗の増加を抑制できる。従って、目標移動量に対する実際の移動量の減少が抑制され、追従ずれを低減することができる。 A lubricating plating layer M2 is formed on the inner peripheral surface 27a of the cylindrical member 27 with which the spherical body 26 abuts. According to this lubricating plating layer M2, since the friction coefficient of the inner peripheral surface 27a is reduced, the slip resistance is increased in a state where the spherical body 26 rolls so as to slide relative to the inner peripheral surface 27a of the cylindrical member 27. Can be suppressed. Therefore, a decrease in the actual movement amount with respect to the target movement amount is suppressed, and the follow-up deviation can be reduced.
また、球状体２６と筒状部材２７とは、非磁性材料であるタングステンからなる。この構成によれば、可動部材用駆動手段１４が有するマグネット２１の影響を受け難くなり、可動部材１２及び球状体２６をより滑らかに動かすことが可能となる。従って、追従ずれを一層低減することができる。 The spherical body 26 and the cylindrical member 27 are made of tungsten, which is a nonmagnetic material. According to this structure, it becomes difficult to receive the influence of the magnet 21 which the drive means 14 for movable members has, and it becomes possible to move the movable member 12 and the spherical body 26 more smoothly. Accordingly, the tracking error can be further reduced.
また、筒状部材２７の外周面２７ｂには、周方向に凹状の接着剤溜まりＡＣが形成されている。フッ素を含む潤滑めっき層Ｍ２は接着剤ＡＨとの密着性が低い場合があるが、この構成によれば、接着剤溜まりＡＣに接着剤ＡＨを確実に保持できるため、ベース部材２に対する筒状部材２７の取付強度を高めることができる。 Further, an adhesive reservoir AC that is concave in the circumferential direction is formed on the outer peripheral surface 27 b of the cylindrical member 27. The lubricating plating layer M2 containing fluorine may have low adhesion to the adhesive AH. However, according to this configuration, the adhesive AH can be reliably held in the adhesive reservoir AC, so that the cylindrical member with respect to the base member 2 The mounting strength of 27 can be increased.
また、筒状部材２７は円筒形状であるため、球状体２６の中心を筒状部材２７の中心軸上に合せる原点復帰を容易に実施できる。 In addition, since the cylindrical member 27 has a cylindrical shape, it is possible to easily perform the return to origin that aligns the center of the spherical body 26 with the central axis of the cylindrical member 27.
より詳細には、例えば、球状体２６が筒状部材２７の内周面２７ａに当接するまで可動部材１２を所定の方向に移動させた後に、可動部材１２を筒状部材２７の半径だけ逆の方向に移動させる。続いて、球状体２６が筒状部材２７の内周面２７ａに当接するまで可動部材１２を所定の方向と直交する別の方向に移動させた後に、可動部材１２を筒状部材２７の半径だけ逆の方向に移動させる。この場合、筒状部材２７が円筒形状であるため、筒状部材２７の中心軸から内周面２７ａまでの距離は、所定の方向と別の方向とのいずれにおいても互いに等しい。従って、上記工程を実施することにより球状体２６の中心を筒状部材２７の中心軸上に合せることができる。 More specifically, for example, after the movable member 12 is moved in a predetermined direction until the spherical body 26 contacts the inner peripheral surface 27a of the cylindrical member 27, the movable member 12 is reversed by the radius of the cylindrical member 27. Move in the direction. Subsequently, after the movable member 12 is moved in another direction orthogonal to a predetermined direction until the spherical body 26 contacts the inner peripheral surface 27 a of the cylindrical member 27, the movable member 12 is moved by the radius of the cylindrical member 27. Move in the opposite direction. In this case, since the cylindrical member 27 has a cylindrical shape, the distance from the central axis of the cylindrical member 27 to the inner peripheral surface 27a is equal to each other in both the predetermined direction and the other direction. Therefore, the center of the spherical body 26 can be aligned with the central axis of the cylindrical member 27 by performing the above process.
また、筒状部材２７は、より剛性の高いベース部材２に取り付けられているため、筒状部材２７に対してレンズ駆動装置１に印加される衝撃や振動により長い減衰振動が作用することを抑制できる。従って、筒状部材２７が受ける衝撃や振動の影響を抑制できる。 Moreover, since the cylindrical member 27 is attached to the base member 2 having higher rigidity, it is possible to suppress a long damping vibration from acting on the cylindrical member 27 due to an impact or vibration applied to the lens driving device 1. it can. Accordingly, it is possible to suppress the influence of the shock and vibration that the cylindrical member 27 receives.
本発明は、前述した実施形態に限定されるものではない。 The present invention is not limited to the embodiment described above.
支持手段１６は、３個の第１〜第３の支持部２３Ａ〜２３Ｃを有していたが、４個以上の支持部を有していてもよい。 The support means 16 has the three first to third support portions 23A to 23C, but may have four or more support portions.
また、筒状部材２７は、円筒形状を有していたが、断面が六角形や八角形といった多角形の筒形状であってもよい。 The cylindrical member 27 has a cylindrical shape, but may have a polygonal cylindrical shape such as a hexagonal or octagonal cross section.
また、手振れ補正機構７の可動部材１２は、ベース部材２に支持されてベース部材２に対して移動するようになっていたが、この構成に限定されることはない。図示しないが、レンズ駆動装置１では、ベース部材２に焦点調整機構６を介して光軸Ｃ方向に移動する枠体が保持されていてもよい。この枠体には、支持手段１６を介して、可動部材１２が光軸Ｃに対して直交する平面内で移動可能に配置されている。可動部材１２には、レンズが取り付けられている。 Further, the movable member 12 of the camera shake correction mechanism 7 is supported by the base member 2 and moves relative to the base member 2, but is not limited to this configuration. Although not shown, in the lens driving device 1, a frame that moves in the direction of the optical axis C via the focus adjustment mechanism 6 may be held on the base member 2. The movable member 12 is arranged on the frame so as to be movable in a plane orthogonal to the optical axis C via the support means 16. A lens is attached to the movable member 12.
また、可動部材用駆動手段１４は、ベース部材２にコイル２２を配置し、可動部材１２にマグネット２１を配置していたが、ベース部材２にマグネット２１を配置し、可動部材１２にコイル２２を配置してもよい。 Further, the movable member driving means 14 has the coil 22 disposed on the base member 2 and the magnet 21 disposed on the movable member 12, but the magnet 21 is disposed on the base member 2 and the coil 22 disposed on the movable member 12. You may arrange.
また、可動部材１２は規制手段１３によって移動を規制されていたが、規制手段１３による特定の移動軌跡を有することに限定されない。 Further, although the movement of the movable member 12 is restricted by the restriction means 13, the movable member 12 is not limited to having a specific movement locus by the restriction means 13.
筒状部材２７は、抜け止め部ＡＣに保持された接着剤を用いてベース部材２に取り付けられていたが、ベース部材２と一体成型してもよい。この場合であっても、ベース部材２の樹脂材料が筒状部材２７の抜け止め部ＡＣに入り込んで保持できるので、ベース部材２に対する筒状部材２７の取付強度を高めることができる。筒状部材２７と可動部材１２との一体成型であってもよい。 The cylindrical member 27 is attached to the base member 2 using the adhesive held in the retaining portion AC, but may be integrally formed with the base member 2. Even in this case, since the resin material of the base member 2 can enter and hold the retaining portion AC of the cylindrical member 27, the mounting strength of the cylindrical member 27 with respect to the base member 2 can be increased. The cylindrical member 27 and the movable member 12 may be integrally formed.
１…レンズ駆動装置、
２…ベース部材（枠体）、
１２…可動部材、
１４…可動部材用駆動手段、
１６…支持手段、
２１…マグネット、
２２…コイル、
２３Ａ…第１の支持部、
２３Ｂ…第２の支持部、
２３Ｃ…第３の支持部、
２６…球状体、
２７…筒状部材、
ＡＣ…接着剤溜まり（抜け止め部）、
Ｃ…光軸、
Ｍ１，Ｍ２…潤滑めっき層。
1 ... Lens driving device,
2 ... Base member (frame),
12 ... movable member,
14 ... Driving means for the movable member,
16 ... support means,
21 ... Magnet,
22 ... Coil,
23A ... 1st support part,
23B ... second support,
23C ... third support,
26 ... spherical body,
27 ... cylindrical member,
AC ... Adhesive reservoir (preventing part),
C: Optical axis,
M1, M2 ... Lubricating plating layer.
Claims (2)
前記枠体に配置され、光軸に対して直交する平面内で移動する可動部材と、
前記枠体と前記可動部材とに配置され、前記光軸に対して直交する方向に前記可動部材を移動させる可動部材用駆動手段と、
前記枠体に対して前記可動部材を前記平面内で移動可能に支持する支持手段と、
を備え、
前記支持手段は、
前記可動部材を支持する球状体と、
前記枠体又は前記可動部材に配置され、前記球状体を取り囲んで、前記平面内での前記球状体の移動を規制する筒状部材と、
を有し、
前記筒状部材は、外周面が前記枠体の支持面によって支持され、内周面が前記球状体と当接可能な、レンズ駆動装置。 A frame,
A movable member disposed on the frame and moving in a plane perpendicular to the optical axis;
Movable member driving means arranged on the frame body and the movable member and moving the movable member in a direction orthogonal to the optical axis;
Support means for supporting the movable member so as to be movable in the plane with respect to the frame;
With
The support means is
A spherical body that supports the movable member;
A cylindrical member that is disposed on the frame body or the movable member, surrounds the spherical body, and restricts movement of the spherical body in the plane;
Have
The cylindrical member is a lens driving device in which an outer peripheral surface is supported by a support surface of the frame body, and an inner peripheral surface can be in contact with the spherical body .
前記筒状部材の前記内周面には、摩擦係数を低減し、かつ帯電を防止するためのめっき層が形成され、
前記筒状部材の前記外周面には、周方向に凹状の抜け止め部が形成され、
前記球状体と前記筒状部材とは、非磁性材料からなる請求項１に記載のレンズ駆動装置。 The lens driving device is a lens driving device for a portable terminal,
On the inner peripheral surface of the cylindrical member, a plating layer for reducing a friction coefficient and preventing charging is formed,
The outer peripheral surface of the tubular member, retaining portion of the concave is formed in the circumferential direction,
Wherein the spherical member and the tubular member, the lens driving device according to claim 1 ing of a non-magnetic material.
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