JP4825148B2 - Lens moving device - Google Patents

Lens moving device Download PDF

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JP4825148B2
JP4825148B2 JP2007035928A JP2007035928A JP4825148B2 JP 4825148 B2 JP4825148 B2 JP 4825148B2 JP 2007035928 A JP2007035928 A JP 2007035928A JP 2007035928 A JP2007035928 A JP 2007035928A JP 4825148 B2 JP4825148 B2 JP 4825148B2
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sliding contact
lens
moving device
moving frame
cylinder
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JP2008203302A (en
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和広 佐藤
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Cosina Co Ltd
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Cosina Co Ltd
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Description

本発明は、レンズを移動させるフォーカシング機構やズーミング機構などに用いて好適なレンズ移動装置に関する。   The present invention relates to a lens moving device suitable for use in a focusing mechanism or a zooming mechanism for moving a lens.

一般に、レンズユニットに搭載するフォーカシング機構やズーミング機構には、所定のレンズ群を光軸方向に移動させるレンズ移動装置を備えており、この種のレンズ移動装置は、通常、位置を固定し、かつ光軸方向のガイド溝を有する中胴と、この中胴の外側に回動可能に配し、かつカム溝を有するカム筒と、中胴の内側に移動自在に配し、かつ所定のレンズ群を保持するとともに、ガイド溝及びカム溝の双方に係合する係合突起部を有する移動枠とを備えている。   In general, a focusing mechanism and a zooming mechanism mounted on a lens unit are provided with a lens moving device that moves a predetermined lens group in the optical axis direction. This type of lens moving device usually has a fixed position, and An inner cylinder having a guide groove in the optical axis direction, a cam cylinder having a cam groove which is rotatably arranged on the outer side of the inner cylinder, and a movable lens arranged on the inner side of the inner cylinder, and a predetermined lens group And a moving frame having an engaging protrusion that engages with both the guide groove and the cam groove.

従来、この種のレンズ移動装置としては、特開2000−193862号公報で開示される光学系位置調整可能な鏡枠が知られている。この光学系位置調整可能な鏡枠(レンズ移動装置)は、レンズを保持する内枠,第一の調整ネジが螺着される中枠,第二の調整ネジが螺着される外枠とで構成され、互いに平行バネで連結され、さらに、第一の調整ネジをX軸方向にねじ込むことによって、内枠をX軸方向に変位させるとともに、第二の調整ネジをY軸方向にねじ込むことによって、中枠を介して内枠をY軸方向に変位させ、レンズの光軸の位置調整を光軸の傾きのない状態で行うことができるようにして、光学部材の光学系位置調整(芯出し)を容易に行えるようにしたものである。
特開2000−193862号
Conventionally, as this type of lens moving device, an optical system position-adjustable lens frame disclosed in Japanese Patent Laid-Open No. 2000-193862 is known. This optical system position adjustable lens frame (lens moving device) includes an inner frame for holding a lens, an inner frame to which a first adjustment screw is screwed, and an outer frame to which a second adjustment screw is screwed. And are connected to each other by parallel springs, and further, the first adjustment screw is screwed in the X-axis direction to displace the inner frame in the X-axis direction, and the second adjustment screw is screwed in the Y-axis direction. The position of the optical axis of the lens can be adjusted without tilting the optical axis by displacing the inner frame in the Y-axis direction via the middle frame. ) Can be easily performed.
JP 2000-193862 A

しかし、上述した従来のレンズ移動装置(光学系位置調整可能な鏡枠)は、次のような問題点があった。   However, the above-described conventional lens moving device (a lens frame capable of adjusting the optical system position) has the following problems.

第一に、光学系位置調整(芯出し)機構を、レンズを光軸方向に移動させるレンズ移動装置に対して別途独立して構成するとともに、光学系位置調整機構は、X軸方向に変位させる調整機構の外側にY軸方向に変位させる調整機構を配する構成を採用するなど、光学系全体の大型化(大径化)を招く。   First, the optical system position adjustment (centering) mechanism is configured separately from the lens moving device that moves the lens in the optical axis direction, and the optical system position adjustment mechanism is displaced in the X axis direction. Adopting a configuration in which an adjusting mechanism for displacing in the Y-axis direction is provided outside the adjusting mechanism, leading to an increase in the size (large diameter) of the entire optical system.

第二に、X軸方向に変位させる調整機構とY軸方向に変位させる調整機構は、それぞれ調整ネジと平行バネの組合わせにより構成するため、平行バネの弾性力が常に調整ネジの軸方向に付加されるなど、使用による振動や衝撃によって初期調整に狂いを生じやすく、信頼性に難がある。   Secondly, since the adjusting mechanism for displacing in the X-axis direction and the adjusting mechanism for displacing in the Y-axis direction are each composed of a combination of an adjusting screw and a parallel spring, the elastic force of the parallel spring is always in the axial direction of the adjusting screw. The initial adjustment is likely to be distorted due to vibration and shock due to use, and there is a difficulty in reliability.

本発明は、このような背景技術に存在する課題を解決したレンズ移動装置の提供を目的とするものである。   An object of the present invention is to provide a lens moving device that solves the problems existing in the background art.

本発明は、上述した課題を解決するため、位置を固定し、かつ光軸Fc方向のガイド溝2gを有する中胴2と、中胴2の外側に回動可能に配し、かつカム溝3cを有するカム筒3と、中胴2の内側に移動自在に配し、かつ所定のレンズ群Lを保持するとともに、ガイド溝2g及びカム溝3cの双方に係合する係合突起部4s…を有する移動枠4とを備えるレンズ移動装置1を構成するに際して、係合突起部4s…を一つ用いるとともに、移動枠4に螺合した複数の摺接突起部5…及び各摺接突起部5…を少なくとも中胴2に設けた孔部6…から所定の治具Tにより回動させて移動枠4の外周面4fからの突出長Dpを変更可能な突出長変更手段7からなる芯出調整機構Mを備えてなることを特徴とする。   In order to solve the above-described problems, the present invention fixes the position and has an inner cylinder 2 having a guide groove 2g in the direction of the optical axis Fc, and is rotatably disposed on the outer side of the intermediate cylinder 2, and a cam groove 3c. , A cam cylinder 3 that is movably disposed inside the middle barrel 2 and holds a predetermined lens group L, and engages with both the guide groove 2g and the cam groove 3c. When the lens moving device 1 including the moving frame 4 is configured, one engaging protrusion 4s is used, and a plurality of sliding contact protrusions 5 screwed to the moving frame 4 and each sliding contact protrusion 5 are used. Is adjusted by a projection length changing means 7 which can change the projection length Dp from the outer peripheral surface 4f of the moving frame 4 by rotating at least through a hole 6 provided in the inner cylinder 2 with a predetermined jig T. A mechanism M is provided.

この場合、発明の好適な態様により、摺接突起部5…は、中胴2の内周面2iに当接する合成樹脂により形成した当接部11…を設けて構成できる。また、摺接突起部5…は、移動枠4の光軸Fc方向における異なる位置に二列に配することができる。さらに、中胴2の内周面2iにおける摺接突起部5…が摺接する面には、摺接突起部5…の移動方向(光軸Fc方向)に沿った挽目部12…を設けることができる。   In this case, according to a preferred aspect of the invention, the sliding contact projections 5 can be configured by providing contact portions 11 formed of a synthetic resin that contacts the inner peripheral surface 2 i of the inner drum 2. The sliding contact protrusions 5 can be arranged in two rows at different positions in the optical axis Fc direction of the moving frame 4. Further, on the surface of the inner peripheral surface 2i of the inner drum 2 where the sliding contact projections 5 ... are in sliding contact, the grind portions 12 along the moving direction (optical axis Fc direction) of the sliding contact projections 5 ... are provided. Can do.

このような構成を有する本発明に係るレンズ移動装置1によれば、次のような顕著な効果を奏する。   According to the lens moving device 1 according to the present invention having such a configuration, the following remarkable effects can be obtained.

(1) 係合突起部4s…を一つ用いるとともに、移動枠4に螺合した複数の摺接突起部5…及び各摺接突起部5…を少なくとも中胴2に設けた孔部6…から所定の治具Tにより回動させて移動枠4の外周面4fからの突出長Dpを変更可能な突出長変更手段7からなる芯出調整機構Mを備えるため、芯出調整機構Mは、レンズ移動装置の基本構成を利用し、この基本構成に含む状態で付設することができ、光学系全体の小型コンパクト化(小径化)を実現できる。   (1) A single engaging projection 4s is used, and a plurality of sliding contact projections 5 screwed to the moving frame 4 and the sliding contact projections 5 are provided at least in the inner cylinder 2. Provided with a centering adjustment mechanism M comprising a protrusion length changing means 7 that can be rotated by a predetermined jig T to change the protrusion length Dp from the outer peripheral surface 4f of the moving frame 4. The basic configuration of the lens moving device can be used and attached in a state included in this basic configuration, and the entire optical system can be made compact and compact (small diameter).

(2) 中胴2と移動枠4間の隙間に複数の摺接突起部5…を介在させることによりレンズ群Lに対するX軸方向とY軸方向の位置調整(芯出し)を行うため、バネ等による弾性力は付加されない。したがって、使用による振動や衝撃によっても初期調整に狂いが生じにくく、信頼性をより高めることができる。   (2) In order to adjust the position (centering) of the lens group L in the X-axis direction and the Y-axis direction by interposing a plurality of sliding contact projections 5... The elastic force by etc. is not added. Therefore, the initial adjustment is less likely to be distorted due to vibration or shock caused by use, and the reliability can be further improved.

(3) 好適な態様により、摺接突起部5…を、中胴2の内周面2iに当接する合成樹脂により形成した当接部11…を設けて構成すれば、中胴2に対する移動枠4の円滑な摺動(滑り)を確保できる。   (3) If the sliding contact projections 5 are provided with a contact portion 11 formed of a synthetic resin that is in contact with the inner peripheral surface 2i of the inner cylinder 2 according to a preferred embodiment, a moving frame for the inner cylinder 2 is provided. 4 smooth sliding (sliding) can be secured.

(4) 好適な態様により、摺接突起部5…を、移動枠4の光軸Fc方向における異なる位置に二列に配すれば、中胴2に対する移動枠4の円滑な平行移動を確保できる。   (4) If the sliding contact projections 5 are arranged in two rows at different positions in the optical axis Fc direction of the moving frame 4 according to a preferred embodiment, smooth parallel movement of the moving frame 4 with respect to the inner cylinder 2 can be ensured. .

(5) 好適な態様により、中胴2の内周面2iにおける摺接突起部5…が摺接する面には、摺接突起部5…の移動方向に沿った挽目部12…を設ければ、中胴2に対する移動枠4の円滑な摺動を確保しつつ摺動音を低減することができる。   (5) According to a preferred embodiment, the surface of the inner peripheral surface 2i of the inner cylinder 2 where the sliding contact projections 5 ... are in sliding contact is provided with a grind portion 12 along the moving direction of the sliding contact projections 5 .... In this case, it is possible to reduce the sliding noise while ensuring smooth sliding of the moving frame 4 with respect to the inner drum 2.

次に、本発明に係る最良の実施形態を挙げ、図面に基づき詳細に説明する。   Next, the best embodiment according to the present invention will be given and described in detail with reference to the drawings.

まず、本実施形態に係るレンズ移動装置1の構成について、図1〜図7を参照して説明する。   First, the configuration of the lens moving device 1 according to the present embodiment will be described with reference to FIGS.

図1は、スチルカメラに用いる交換レンズAの概要を示し、特に、交換レンズAの一部を構成するレンズ移動装置1を明示する。交換レンズAは、不図示のカメラ本体(カメラボディ)に着脱するリング形のレンズマウント部21を備え、このレンズマウント部21にレンズ移動装置1が支持される。このレンズ移動装置1は、レンズマウント部21の前端面に固定した中胴2と、中胴2の外側に配したカム筒3と、中胴2の内側に配した移動枠4を備える。   FIG. 1 shows an outline of an interchangeable lens A used for a still camera, and particularly shows a lens moving device 1 constituting a part of the interchangeable lens A. The interchangeable lens A includes a ring-shaped lens mount portion 21 that is attached to and detached from a camera body (camera body) (not shown), and the lens moving device 1 is supported by the lens mount portion 21. The lens moving device 1 includes a middle cylinder 2 fixed to the front end surface of the lens mount portion 21, a cam cylinder 3 disposed outside the middle cylinder 2, and a moving frame 4 disposed inside the middle cylinder 2.

この場合、中胴2は、図3に示すように、光軸Fc方向に沿い、かつ図2に示すように、周方向へ120゜間隔で配した三つのガイド溝2g…を有する。また、カム筒3は、中胴2に対して光軸Fc方向の変位が規制され、かつ中胴2の外周面に回動可能に装填する。このカム筒3は、図3に示すように、螺旋方向に沿い、かつ図2に示すように、周方向へ120゜間隔で配した三つのカム溝3c…を有する。さらに、カム筒3には、このカム筒3よりも大径となるフォーカスリング22を取付ける。このフォーカスリング22は、交換レンズAの最外郭に位置する。一方、移動枠4は、中胴2の内周面に対して光軸Fc方向へ移動自在に装填する。この移動枠4は、所定のレンズ群Lを保持するとともに、移動枠4の外周面には、ガイド溝2g…及びカム溝3c…の双方に係合し、かつ図2に示すように、周方向へ120゜間隔で配した三つの係合突起部4s…(4sa,4sb,4sc)を突設する。   In this case, the inner cylinder 2 has three guide grooves 2g... Arranged along the optical axis Fc direction as shown in FIG. 3 and at intervals of 120 ° in the circumferential direction as shown in FIG. Further, the cam cylinder 3 is mounted so as to be able to rotate on the outer peripheral surface of the middle cylinder 2 while the displacement in the optical axis Fc direction is restricted with respect to the middle cylinder 2. This cam cylinder 3 has three cam grooves 3c arranged along the spiral direction as shown in FIG. 3 and at intervals of 120 ° in the circumferential direction as shown in FIG. Further, a focus ring 22 having a larger diameter than that of the cam cylinder 3 is attached to the cam cylinder 3. The focus ring 22 is located on the outermost contour of the interchangeable lens A. On the other hand, the moving frame 4 is loaded so as to be movable in the direction of the optical axis Fc with respect to the inner peripheral surface of the middle barrel 2. The moving frame 4 holds a predetermined lens group L, and the outer peripheral surface of the moving frame 4 is engaged with both the guide grooves 2g and the cam grooves 3c, and as shown in FIG. Three engaging protrusions 4s... (4sa, 4sb, 4sc) are provided to protrude in the direction at intervals of 120 °.

以上がレンズ移動装置1の基本構成となり、フォーカスリング22を手で回すことにより一体のカム筒3が回動し、これにより、カム溝3c…が周方向へ変位する。この結果、カム溝3c…とガイド溝2g…の交点に位置する係合突起部4s…がガイド溝2g…に沿って変位するとともに、係合突起部4s…が設けられた移動枠4が変位する。そして、この移動枠4に保持されたレンズ群Lが光軸Fc方向に移動することによりフォーカシングが行われる。   The above is the basic configuration of the lens moving device 1, and when the focus ring 22 is turned by hand, the integral cam cylinder 3 is rotated, whereby the cam grooves 3c are displaced in the circumferential direction. As a result, the engaging protrusions 4s located at the intersections of the cam grooves 3c and the guide grooves 2g are displaced along the guide grooves 2g, and the moving frame 4 provided with the engaging protrusions 4s is displaced. To do. Then, focusing is performed by moving the lens group L held in the moving frame 4 in the direction of the optical axis Fc.

他方、本実施形態に係るレンズ移動装置1は、上述した基本構成に対して芯出調整機構Mを付設して構成する。芯出調整機構Mは、移動枠4に螺合する複数(例示は六つ)の摺接突起部5…を備えるとともに、各摺接突起部5…を少なくとも中胴2に設けた孔部6…から所定の治具Tにより回動させて移動枠4の外周面4fからの突出長Dp…を変更可能な突出長変更手段7を備える。   On the other hand, the lens moving device 1 according to the present embodiment is configured by adding a centering adjustment mechanism M to the basic configuration described above. The centering adjustment mechanism M includes a plurality of (six for example) sliding contact projections 5 that are screwed into the moving frame 4, and each of the sliding contact projections 5. Is provided with a protrusion length changing means 7 that can be rotated by a predetermined jig T to change the protrusion length Dp from the outer peripheral surface 4f of the moving frame 4.

この場合、摺接突起部5は、図6及び図7に示すように、偏平円柱形の基部31とこの基部31に組付けることにより中胴2の内周面2iに当接する当接部11を有する。基部31は精密性を確保するため、例えば、ステンレス等の金属素材により形成し、外周面にはネジ部31nを設ける。このネジ部31nは、図7に示すように、移動枠4に形成したネジ孔部32に螺合する。また、基部31の上面には凹形のリング溝31sを形成し、このリング溝31sに、筒形に形成した当接部11を嵌着(圧入)する。この当接部11は摩擦係数が比較的小さいポリアセタール樹脂(POM)やABS樹脂等の合成樹脂素材により形成し、上端面が中胴2の内周面2iに当接する当接面11sとなる。さらに、リング溝31sよりも中心側に位置する基部31の上面には、所定の治具Tが係合する治具係合部31cを設ける。例示の治具係合部31cは、マイナスドライバTrが係合するマイナス形の係合凹部31crである。   In this case, as shown in FIG. 6 and FIG. 7, the sliding contact projection portion 5 includes a flat cylindrical base 31 and a contact portion 11 that contacts the inner peripheral surface 2 i of the inner cylinder 2 by being assembled to the base 31. Have In order to ensure the precision, the base 31 is made of, for example, a metal material such as stainless steel, and a screw portion 31n is provided on the outer peripheral surface. As shown in FIG. 7, the screw portion 31 n is screwed into a screw hole portion 32 formed in the moving frame 4. Further, a concave ring groove 31s is formed on the upper surface of the base 31, and the abutting portion 11 formed in a cylindrical shape is fitted (press-fitted) into the ring groove 31s. The abutment portion 11 is formed of a synthetic resin material such as polyacetal resin (POM) or ABS resin having a relatively small friction coefficient, and the upper end surface serves as an abutment surface 11s that abuts against the inner peripheral surface 2i of the inner cylinder 2. Further, a jig engaging portion 31c with which a predetermined jig T is engaged is provided on the upper surface of the base portion 31 located on the center side of the ring groove 31s. The illustrated jig engaging portion 31c is a minus-shaped engaging recess 31cr with which the minus driver Tr is engaged.

このように構成する摺接突起部5…は、図1及び図2に示すように、移動枠4の光軸Fc方向における異なる位置に二列に配するとともに、各列においては周方向へ120゜間隔で三つ(計六つ)配する。この際、各摺接突起部5…は、図2に示すように、各係合突起部4s…の相互間における中央位置にそれぞれ配する。摺接突起部5…を、移動枠4の光軸Fc方向における異なる位置に二列に配することにより、中胴2に対する移動枠4の円滑な平行移動を確保できる利点がある。   As shown in FIGS. 1 and 2, the sliding contact projections 5 configured in this way are arranged in two rows at different positions in the optical axis Fc direction of the moving frame 4, and in each row, 120 in the circumferential direction. Distribute three (six in total) at intervals of ゜. At this time, as shown in FIG. 2, the sliding contact projections 5 are arranged at the center positions between the engagement projections 4 s. By arranging the sliding contact projections 5 in two rows at different positions in the optical axis Fc direction of the moving frame 4, there is an advantage that a smooth parallel movement of the moving frame 4 with respect to the inner cylinder 2 can be ensured.

一方、当接部11が当接する中胴2の内周面2iには、摺接プレート35を設ける。この摺接プレート35における当接面11sの摺接する面には、摺接突起部5の移動方向(光軸Fc方向)に沿った挽目部12をプレス加工等により形成する。これにより、中胴2に対する移動枠4の円滑な摺動を確保しつつ摺動音を低減することができる。なお、この挽目部12は、摺接プレート35を用いることなく、中胴2の内周面2iに直接形成することも可能である。   On the other hand, a slidable contact plate 35 is provided on the inner peripheral surface 2i of the middle barrel 2 with which the contact portion 11 contacts. On the surface of the slidable contact plate 35 slidably contacted with the contact surface 11 s, a grind portion 12 is formed by pressing or the like along the moving direction of the slidable contact protruding portion 5 (optical axis Fc direction). Thereby, a sliding sound can be reduced, ensuring the smooth sliding of the moving frame 4 with respect to the inner cylinder 2. FIG. In addition, this grind part 12 can also be directly formed on the inner peripheral surface 2 i of the inner drum 2 without using the sliding contact plate 35.

さらに、摺接プレート35を含む中胴2には、マイナスドライバTr(所定の治具T)が挿通する孔部6…を形成する。この場合、孔部6の内径は、少なくとも当接部11における当接面11sの最外径よりも小さくなるように選定する。これにより、マイナスドライバTrを中胴2の外側から孔部6を通して係合凹部31crに係合させ、摺接突起部5を右方向又は左方向に回すことができる。この構成は、摺接突起部5が移動枠4の外周面4fから突出する突出長Dpを変更可能な突出長変更手段7となり、また、摺接突起部5…と突出長変更手段7は本発明の要部となる芯出調整機構Mを構成する。   Furthermore, the inner cylinder 2 including the sliding contact plate 35 is formed with holes 6 through which the minus driver Tr (predetermined jig T) is inserted. In this case, the inner diameter of the hole 6 is selected so as to be at least smaller than the outermost diameter of the contact surface 11 s in the contact part 11. Thereby, the minus driver Tr can be engaged with the engagement recess 31cr through the hole 6 from the outside of the middle barrel 2, and the sliding contact projection 5 can be rotated rightward or leftward. In this configuration, the slidable contact protrusion 5 is a protrusion length changing means 7 that can change the protrusion length Dp protruding from the outer peripheral surface 4f of the moving frame 4, and the slidable protrusion 5 ... and the protrusion length changing means 7 are A centering adjustment mechanism M which is a main part of the invention is configured.

他方、レンズ移動装置1は、このような芯出調整機構Mを備えるため、前述した三つの係合突起部4s…のうち、一つの係合突起部4s(4sa)のみを本来の係合突起部として機能させる。即ち、一つの係合突起部4saをガイド溝2g及びカム溝3cに対して比較的小さいクリアランスを介して係合させる。この係合突起部4saを図4に示す。この場合、係合突起部4sは、支軸を兼ねるネジ部41と、このネジ部41により回動自在に支持される、例えば、POM等の合成樹脂素材により形成したローラ部42xを備える。したがって、移動枠4の外周面4fには、ネジ部41が螺着するネジ孔43を形成するとともに、ローラ部42xが図4に示すようにガイド溝2g及びカム溝3cに対して比較的小さいクリアランスにより係合する。   On the other hand, since the lens moving device 1 includes such a centering adjustment mechanism M, only one engagement protrusion 4s (4sa) of the above-described three engagement protrusions 4s. Function as a part. That is, one engagement protrusion 4sa is engaged with the guide groove 2g and the cam groove 3c through a relatively small clearance. This engagement protrusion 4sa is shown in FIG. In this case, the engagement protrusion 4s includes a screw portion 41 that also serves as a support shaft, and a roller portion 42x that is rotatably supported by the screw portion 41 and is formed of a synthetic resin material such as POM, for example. Therefore, the outer peripheral surface 4f of the moving frame 4 is formed with a screw hole 43 into which the screw portion 41 is screwed, and the roller portion 42x is relatively small with respect to the guide groove 2g and the cam groove 3c as shown in FIG. Engage with clearance.

さらに、他の二つの係合突起部4s…(4sb,4sc)は、ガイド溝2g…に対して比較的大きクリアランスC…を介して係合させるとともに、カム溝2c…に対して比較的小さいクリアランスにより係合させる。係合突起部4sb(他の係合突起部4scも同じ)を図5に示す。係合突起部4sbも基本的な構成は、上述した係合突起部4saと同じであるが、図5に示すように、外径を上述したローラ部42xの外径よりも小さくした細目のローラ部42yを用いる。このような係合突起部4sb(4sc)を用いることにより、移動枠4の径方向への変位(逃げ)を確保できる。よって、芯出調整機構Mを実質的に機能させることができ、本来のレンズ移動装置1の機能を確保しつつ光学系位置調整(芯出し)を確実に行うことができる。   Further, the other two engaging projections 4s (4sb, 4sc) are engaged with the guide grooves 2g through a relatively large clearance C, and are relatively small with respect to the cam grooves 2c. Engage with clearance. FIG. 5 shows the engaging protrusion 4sb (the same applies to the other engaging protrusions 4sc). The engagement protrusion 4sb is basically the same as the engagement protrusion 4sa described above, but as shown in FIG. 5, a fine roller whose outer diameter is smaller than the outer diameter of the roller part 42x described above. Part 42y is used. By using such engagement protrusions 4sb (4sc), the displacement (escape) of the moving frame 4 in the radial direction can be ensured. Therefore, the centering adjustment mechanism M can be substantially functioned, and the optical system position adjustment (centering) can be reliably performed while ensuring the original function of the lens moving device 1.

なお、一つのレンズ群Lについて説明したが、通常、図1に示すように、他のレンズ群Leも異なる角度のカム溝(3c)によリ同時に移動する構成を備えている。この場合、上述した芯出調整機構Mは、特に、精密調整が要求される所定のレンズ群Lに適用すれば足りるが、他のレンズ群Leに対しても同様に適用することができる。図1中、4seは、他のレンズ群Leを移動させるための係合突起部を示している。   Although one lens group L has been described, normally, as shown in FIG. 1, the other lens groups Le are also configured to move simultaneously by cam grooves (3c) of different angles. In this case, the centering adjustment mechanism M described above may be applied to the predetermined lens group L that requires precise adjustment, but can be similarly applied to other lens groups Le. In FIG. 1, 4se indicates an engaging protrusion for moving the other lens group Le.

次に、本実施形態に係るレンズ移動装置1の組付手順を含む機能について、図1〜図7を参照して説明する。   Next, functions including an assembling procedure of the lens moving device 1 according to the present embodiment will be described with reference to FIGS.

まず、移動枠4の各ネジ孔部32…に摺接突起部5…をそれぞれ螺合させる。この際、移動枠4の外周面4fから摺接突起部5…が突出しない状態に螺合させる。移動枠4に全て(六つ)の摺接突起部5…を螺合するとともに、レンズ群L等の他の部品の組付が終了したなら、移動枠4を中胴2の内部に挿入し、さらに、不図示の芯出調整装置にセットする。芯出調整装置は、レンズ群Lの光軸中心を確認できる機能を備えており、セットした中胴2の移動枠4をスプリング等の付勢機能により径方向一方に付勢しながら芯出調整を行う。具体的には、図7に示すように、中胴2に設けた孔部6の位置に摺接突起部5の位置を合わせるとともに、この孔部6に外側からマイナスドライバTrを挿入し、係合凹部31crに係合させることにより摺接突起部5を右方向又は左方向に回し操作する。これにより、各摺接突起部5…を移動枠4の外周面4fから突出させて内筒2の内周面2iに当接させるとともに、全摺接突起部5…を内筒2の内周面2iに当接させた状態において、レンズ群Lの光軸が正規の光軸Fcに一致し、かつ平行になるように、各摺接突起部5…の突出長Dp…を変更する芯出調整を行う。   First, the sliding contact projections 5 are screwed into the screw hole portions 32 of the moving frame 4, respectively. At this time, the sliding contact projections 5 are screwed into a state where they do not protrude from the outer peripheral surface 4f of the moving frame 4. When all (six) sliding contact projections 5 are screwed onto the moving frame 4 and other parts such as the lens group L are assembled, the moving frame 4 is inserted into the inner barrel 2. Further, it is set in a centering adjusting device (not shown). The centering adjustment device has a function of confirming the center of the optical axis of the lens group L, and the centering adjustment is performed while urging the moving frame 4 of the set inner cylinder 2 in one radial direction by an urging function such as a spring. I do. Specifically, as shown in FIG. 7, the position of the sliding contact projection 5 is aligned with the position of the hole 6 provided in the inner cylinder 2, and a minus driver Tr is inserted into the hole 6 from the outside. By engaging with the mating recess 31cr, the sliding contact projection 5 is operated to rotate rightward or leftward. As a result, the sliding contact projections 5 are projected from the outer peripheral surface 4 f of the moving frame 4 to be brought into contact with the inner peripheral surface 2 i of the inner cylinder 2, and the entire sliding contact projections 5 are made to contact the inner periphery of the inner cylinder 2. The centering for changing the projection length Dp of each sliding contact projection 5 so that the optical axis of the lens group L coincides with and is parallel to the normal optical axis Fc in the state of being in contact with the surface 2i. Make adjustments.

芯出調整が終了したなら、中胴2の外周面にカム筒3を装着し、カム筒3のカム溝3c…及び中胴2のガイド溝2g…の各位置を一致させた状態で、各係合突起部4s…をカム筒3の外側からネジ孔部43…に螺着する。これにより、レンズ移動装置1の組付が終了する。この後、中胴2に対するレンズマウント部21の取付やカム筒3に対するフォーカスリング22の取付などを行うことにより交換レンズAを組立てることができる。   When the centering adjustment is completed, the cam cylinder 3 is mounted on the outer peripheral surface of the middle cylinder 2, and the cam grooves 3c of the cam cylinder 3 and the guide grooves 2g of the middle cylinder 2 are aligned with each other, The engaging protrusions 4 s are screwed into the screw holes 43 from the outside of the cam cylinder 3. Thereby, the assembly | attachment of the lens moving apparatus 1 is complete | finished. Thereafter, the interchangeable lens A can be assembled by attaching the lens mount portion 21 to the middle barrel 2 and attaching the focus ring 22 to the cam barrel 3.

よって、このような本実施形態に係るレンズ移動装置1によれば、係合突起部4s…を一つ用いるとともに、移動枠4に螺合した複数の摺接突起部5…及び各摺接突起部5…を少なくとも中胴2に設けた孔部6…から所定の治具Tにより回動させて移動枠4の外周面4fからの突出長Dpを変更可能な突出長変更手段7からなる芯出調整機構Mを備えるため、芯出調整機構Mは、レンズ移動装置の基本構成を利用し、この基本構成に含む状態で付設することができ、光学系全体の小型コンパクト化(小径化)を実現できる。また、中胴2と移動枠4間の隙間に複数の摺接突起部5…を介在させることによりレンズ群Lに対するX軸方向とY軸方向の位置調整(芯出し)を行うため、バネ等による弾性力は付加されない。したがって、使用による振動や衝撃によっても初期調整に狂いが生じにくく、信頼性をより高めることができる。   Therefore, according to the lens moving device 1 according to the present embodiment, a single engaging protrusion 4s is used, and a plurality of sliding contact protrusions 5 screwed to the moving frame 4 and the sliding protrusions are used. A core composed of projecting length changing means 7 capable of changing the projecting length Dp from the outer peripheral surface 4f of the moving frame 4 by rotating the parts 5 ... at least from a hole 6 provided in the inner cylinder 2 with a predetermined jig T. Since the adjusting mechanism M is provided, the centering adjusting mechanism M uses the basic structure of the lens moving device and can be attached in a state included in the basic structure, thereby reducing the size and size of the optical system as a whole. realizable. In addition, a plurality of sliding contact projections 5 are interposed in the gap between the middle barrel 2 and the moving frame 4 to adjust the position (centering) in the X-axis direction and the Y-axis direction with respect to the lens group L. The elastic force by is not added. Therefore, the initial adjustment is less likely to be distorted due to vibration or shock caused by use, and the reliability can be further improved.

以上、最良の実施形態について詳細に説明したが、本発明は、このような実施形態に限定されるものではなく、細部の構成,形状,素材,数量等において、本発明の要旨を逸脱しない範囲で、任意に変更,追加,削除することができる。   Although the best embodiment has been described in detail above, the present invention is not limited to such an embodiment, and the scope of the present invention is not deviated from the gist of the present invention in the detailed configuration, shape, material, quantity, and the like. It can be changed, added, or deleted arbitrarily.

例えば、レンズ移動装置1は、フォーカシング機構に適用した場合を示したが、ズーミング機構など、レンズ(レンズ群)を移動させる各種機構に適用できる。また、摺接突起部5…は、二つの部品の組合わせにより構成する場合を示したが、合成樹脂等により一体形成し、一つの部品により構成する場合を排除するものではない。なお、本発明に係るレンズ移動装置1は、例示したスチルカメラ(銀塩フィルムカメラ,デジタルカメラ)をはじめ、ビデオカメラやプロジェクタ等の各種映像機器や光学機器等のレンズユニットに利用できる。   For example, the lens moving device 1 has been described as applied to a focusing mechanism, but can be applied to various mechanisms that move a lens (lens group) such as a zooming mechanism. Moreover, although the case where the sliding contact protrusions 5 are constituted by a combination of two parts is shown, the case where they are integrally formed of a synthetic resin or the like and constituted by one part is not excluded. The lens moving device 1 according to the present invention can be used for lens units of various video devices such as video cameras and projectors, optical devices, and the like, as well as the exemplified still cameras (silver film camera, digital camera).

本発明の最良の実施形態に係るレンズ移動装置を明示する交換レンズの断面側面図、Sectional side view of an interchangeable lens clearly showing a lens moving device according to the best embodiment of the present invention, 同レンズ移動装置の主要部を明示する断面正面図、Sectional front view clearly showing the main part of the lens moving device, 同レンズ移動装置の主要部を明示する外観側面図、Appearance side view clearly showing the main part of the lens moving device, 同レンズ移動装置に用いる一つの係合突起部の一部断面側面図、A partial cross-sectional side view of one engaging protrusion used in the lens moving device, 同レンズ移動装置に用いる他の係合突起部の側面図、Side view of another engaging projection used for the lens moving device, 同レンズ移動装置に用いる摺接突起部の斜視図、A perspective view of a sliding contact projection used for the lens moving device, 同レンズ移動装置に用いる摺接突起部を移動枠に螺合した状態を示す断面側面図、A cross-sectional side view showing a state in which a sliding contact projection used for the lens moving device is screwed to a moving frame

1:レンズ移動装置,2:中胴,2g:ガイド溝,2i:中胴の内周面,3:カム筒,3c:カム溝,4:移動枠,4s…:係合突起部,4f:移動枠の外周面,5:摺接突起部,6…:孔部,7:突出長変更手段,11…:当接部,12:挽目部,Fc:光軸,L:レンズ群,T:治具,Dp:突出長,M:芯出調整機構,C:比較的大きいクリアランス   DESCRIPTION OF SYMBOLS 1: Lens moving device, 2: Middle cylinder, 2g: Guide groove, 2i: Inner peripheral surface of middle cylinder, 3: Cam cylinder, 3c: Cam groove, 4: Moving frame, 4s ...: Engagement protrusion part, 4f: Outer peripheral surface of moving frame, 5: sliding contact projection, 6 ...: hole, 7: protrusion length changing means, 11 ...: contact portion, 12: grind portion, Fc: optical axis, L: lens group, T : Jig, Dp: Projection length, M: Centering adjustment mechanism, C: Relatively large clearance

Claims (4)

位置を固定し、かつ光軸方向のガイド溝を有する中胴と、前記中胴の外側に回動可能に配し、かつカム溝を有するカム筒と、前記中胴の内側に移動自在に配し、かつ所定のレンズ群を保持するとともに、前記ガイド溝及び前記カム溝の双方に係合する係合突起部を有する移動枠とを備えるレンズ移動装置において、前記係合突起部を一つ用いるとともに、前記移動枠に螺合した複数の摺接突起部及び各摺接突起部を少なくとも前記中胴に設けた孔部から所定の治具により回動させて前記移動枠の外周面からの突出長を変更可能な突出長変更手段からなる芯出調整機構を備えてなることを特徴とするレンズ移動装置。   A middle cylinder having a fixed position and having a guide groove in the optical axis direction, a cam cylinder having a cam groove provided rotatably on the outer side of the middle cylinder, and a movable cylinder arranged on the inner side of the middle cylinder. And a moving frame having an engaging protrusion that engages with both the guide groove and the cam groove and holds the predetermined lens group, and uses one of the engaging protrusions. In addition, a plurality of sliding contact projections screwed into the moving frame and the sliding contact protruding portions are rotated from at least a hole provided in the inner cylinder by a predetermined jig to protrude from the outer peripheral surface of the moving frame. A lens moving device comprising a centering adjusting mechanism comprising a protruding length changing means capable of changing a length. 前記摺接突起部は、前記中胴の内周面に当接する合成樹脂により形成した当接部を有することを特徴とする請求項1記載のレンズ移動装置。   The lens moving device according to claim 1, wherein the sliding contact protrusion includes a contact portion formed of a synthetic resin that contacts the inner peripheral surface of the inner drum. 前記摺接突起部は、前記移動枠の光軸方向における異なる位置に二列に配することを特徴とする請求項1又は2記載のレンズ移動装置。   3. The lens moving device according to claim 1, wherein the sliding contact protrusions are arranged in two rows at different positions in the optical axis direction of the moving frame. 前記中胴の内周面における前記摺接突起部が摺接する面には、前記摺接突起部の移動方向に沿った挽目部を設けてなることを特徴とする請求項1,2又は3記載のレンズ移動装置。   The ground surface along the moving direction of the said sliding contact protrusion part is provided in the surface which the said sliding contact protrusion part in the inner peripheral surface of the said inner trunk slidably contacts, The Claim 1, 2, or 3 characterized by the above-mentioned. The lens moving device described.
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