JP4617760B2

JP4617760B2 - Autofocus actuator

Info

Publication number: JP4617760B2
Application number: JP2004225015A
Authority: JP
Inventors: 智彦大坂
Original assignee: Mitsumi Electric Co Ltd
Current assignee: Mitsumi Electric Co Ltd
Priority date: 2004-07-30
Filing date: 2004-07-30
Publication date: 2011-01-26
Anticipated expiration: 2024-07-30
Also published as: JP2006050694A

Description

本発明は、オートフォーカス用アクチュエータに関し、さらに詳しくは、デジタルカメラや携帯電話などのカメラ付き小型電子機器に用いることができるオートフォーカス用アクチュエータに関する。 The present invention relates to an autofocus actuator, and more particularly to an autofocus actuator that can be used in a small electronic device with a camera such as a digital camera or a mobile phone.

デジタルカメラなどにおいて、オートフォーカス及びズームを目的として、コイルに流れる電流と、磁石による磁界との相互作用によって、光軸方向にレンズを移動させることができるアクチュエータが使用されている。また、最近では、携帯電話に搭載されているカメラも、撮像素子の画素数が１００万画素以上のメガピクセル化するに伴い、オートフォーカス機能が要求されるようになってきている。 In a digital camera or the like, an actuator capable of moving a lens in the optical axis direction by the interaction between a current flowing through a coil and a magnetic field by a magnet is used for the purpose of autofocus and zoom. In recent years, cameras mounted on mobile phones are also required to have an autofocus function as the number of pixels of the image sensor becomes 1 million pixels or more.

従来のオートフォーカス用アクチュエータとしては、特許文献１に開示されているようなものが知られている。このアクチュエータは、前方レンズと、前方レンズを支持する前方支持枠と、前方支持枠に取り付けられた前方コイルと、前方支持枠に取り付けられた前方バネと、後方レンズと、後方レンズを支持する後方支持枠と、後方支持枠に取り付けられた後方コイルと、後方支持枠に取り付けられた後方バネと、マグネットと、マグネット支持体と、ヨークとを備え、前方コイルは、マグネットとヨーク間の外側ギャップに配置し、後方コイルは、マグネットとヨーク間の内側ギャップに配置し、前方コイルに電流を印加することによって、前方レンズを前方バネの弾性力と釣合う位置に移動させ、後方コイルに電流を印加することによって、後方レンズを後方バネの弾性力と釣合う位置に移動させるようになっている。 As a conventional autofocus actuator, one disclosed in Patent Document 1 is known. The actuator includes a front lens, a front support frame that supports the front lens, a front coil attached to the front support frame, a front spring attached to the front support frame, a rear lens, and a rear that supports the rear lens. A support frame, a rear coil attached to the rear support frame, a rear spring attached to the rear support frame, a magnet, a magnet support, and a yoke, and the front coil has an outer gap between the magnet and the yoke. The rear coil is disposed in the inner gap between the magnet and the yoke, and by applying a current to the front coil, the front lens is moved to a position that balances the elastic force of the front spring, and the current is applied to the rear coil. By applying this, the rear lens is moved to a position that balances the elastic force of the rear spring.

特開2003-295033号JP2003-295033

上記従来のアクチュエータでは、前方バネおよび後方バネを介してコイルに給電される構造となっている。したがって、前方バネおよび後方バネに、それぞれ、コイル用および電源用の電極部を設ける必要があり、そのための曲げ加工を行うため、バネの歩留まりが低下するという問題がある。 The conventional actuator has a structure in which power is supplied to the coil via a front spring and a rear spring. Therefore, it is necessary to provide the coil portions and the power source electrode portions on the front spring and the rear spring, respectively. Since bending is performed for this purpose, there is a problem in that the yield of the spring is lowered.

また、バネ自体にコイルや導線を直接はんだ付けして導通をとっているため、絶縁が必要な構造となっており、部品点数が増えるという問題もある。 In addition, since a coil or a conductive wire is directly soldered to the spring itself to establish conduction, there is a problem that the structure requires insulation and the number of parts increases.

さらに、前方バネと後方バネが異形状になっているため、部品コストがアップしてしまうという問題もある。 Furthermore, since the front spring and the rear spring have different shapes, there is a problem in that the cost of parts increases.

さらに、前方バネと後方バネは、２つのスプリングを円形に繋いだ形状で製作し、取付後に切断するとようになっており、組立工程が煩雑になるという問題もある。 Furthermore, the front spring and the rear spring are manufactured in a shape in which two springs are connected in a circular shape, and are cut after being attached, which causes a problem that the assembly process becomes complicated.

本発明は、これらの問題点に鑑みなされたものであり、その目的は、上記従来例の前方バネおよび後方バネのようなバネを導通させることなくコイルへ電力を供給することできるオートフォーカス用アクチュエータを提供することにある。 The present invention has been made in view of these problems, and an object of the present invention is to provide an autofocus actuator capable of supplying power to a coil without conducting the springs such as the front spring and the rear spring of the conventional example. Is to provide.

上記目的を達成するために、本発明のオートフォーカス用アクチュエータは、一端にレンズが取り付けられた筒状部と該筒状部の他端の外周に設けられたフランジ部とを有するホルダと、
前記ホルダのフランジ部に前記筒状部の周囲に位置するように固定されたコイルと、
前記ホルダの筒状部が挿通する挿通孔をなす内筒部と、該内筒部の外側に所定間隔をおいて設けられた外筒部と、前記内筒部と前記外筒部を前記ホルダのフランジ部と反対側で一体に連結する連結部とを有し、前記所定間隔のスペースに前記コイルを収容するように構成されたヨークと、
前記ヨークの外筒部の内周面の磁石取付面に前記コイルと間隔を置いて対向するように配置された永久磁石と、
前記ホルダの筒状部の光軸方向両側に設けられ、該ホルダを径方向に位置決めした状態で光軸方向に変位可能に支持する一対の上下板バネと、
前記上下板バネのそれぞれの外側に設けられ、該上下板バネを前記ヨークの光軸方向両側との間でそれぞれ挟持するとともに、少なくとも前記ホルダに取り付けられたレンズに対応する部分にそれぞれ開口を有する一対の上下支持枠と、を備え、前記コイルに通電することにより、前記ホルダに取り付けられたレンズを光軸方向に位置調節可能にするオートフォーカス用アクチュエータであって、
各板バネは、前記ホルダに接着される内環部と、該内環部と所定の間隔をおいて設けられ、前記ヨークに接着される外環部と、前記内環部と前記外環部とを接続する複数の連結部とを有しており、前記内環部に荷重がかかった際に、前記連結部が弾性変形することによって、前記ホルダを径方向に位置決めした状態で前記光軸方向に変位可能に支持するように構成されており、
前記ヨークは、前記下板バネの前記外環部が接着されている接着面を有し、該接着面は、前記外筒部の前記連結部とは反対側の端面と連続面をなした状態で、外側に延出するように形成されたタブ状部から構成されており、
前記下板バネの前記ホルダと反対側に、該下板バネと絶縁状態で該下板バネの内環部とともに変位しない外環部に前記コイルに電力を供給するための端子部を設けるとともに、前記ホルダのフランジ部の下板バネ側端面に突起を設け、前記コイルの巻き線の両側の引き出し部をそれぞれ前記突起に巻回するとともに前記ホルダの変位分を吸収可能なたるみを持たせた上で、該引き出し部の端部を前記端子部に接続したことを特徴とする。 To achieve the above object, an autofocus actuator of the present invention includes a holder having a cylindrical portion with a lens attached to one end and a flange portion provided on the outer periphery of the other end of the cylindrical portion;
A coil fixed to the flange portion of the holder so as to be positioned around the cylindrical portion;
An inner cylinder part forming an insertion hole through which the cylindrical part of the holder is inserted, an outer cylinder part provided at a predetermined interval on the outer side of the inner cylinder part, the inner cylinder part and the outer cylinder part being attached to the holder a flange portion and a connecting portion for connecting together the opposite side, and configured yoke to accommodate the coils in the space of the predetermined intervals,
A permanent magnet arranged to face the magnet mounting surface on the inner peripheral surface of the outer cylindrical portion of the yoke at a distance from the coil;
A pair of upper and lower leaf springs provided on both sides in the optical axis direction of the cylindrical portion of the holder, and supported so as to be displaceable in the optical axis direction with the holder positioned in the radial direction;
Provided in each of the outside of the upper and lower plate springs, with respectively sandwiched between the optical axis direction both sides of the said vertical plate spring yokes, each opening in a portion corresponding to a lens mounted at least on the holder A pair of upper and lower support frames, and an autofocus actuator that adjusts the position of the lens attached to the holder in the optical axis direction by energizing the coil,
Each leaf spring includes an inner ring portion bonded to the holder, an outer ring portion provided at a predetermined interval from the inner ring portion, and bonded to the yoke, and the inner ring portion and the outer ring portion. A plurality of connecting portions that connect the optical axis in a state where the holder is positioned in a radial direction by elastically deforming the connecting portions when a load is applied to the inner ring portion. Configured to support displacement in the direction,
The yoke has a bonding surface to which the outer ring portion of the lower leaf spring is bonded, and the bonding surface forms a continuous surface with an end surface of the outer tube portion opposite to the connecting portion. It is composed of a tab-shaped part formed so as to extend outward,
On the opposite side of the holder of the lower plate spring, provided with a terminal portion for supplying electric power to said coil on the outer ring portion which is not displaced together with the inner ring portion of the lower plate spring in an insulated state with the lower plate spring, A protrusion is provided on the lower plate spring side end surface of the flange portion of the holder, and the lead portions on both sides of the coil winding are wound around the protrusion, and a slack capable of absorbing the displacement of the holder is provided. The end of the lead-out portion is connected to the terminal portion.

以上のような構成を有する本発明のオートフォーカス用アクチュエータによれば、板バネに電極部用の折り曲げ加工などは必要なくなり、また板バネ自体を導通させていないので、板バネと他の部品との絶縁を考慮する必用もない。また、一対の板バネを同じ形状の板バネとすることもでき、コストダウンも可能となる他、組立ても簡単に行える。さらに、コイルの巻き線の引き出し部がホルダの変位に伴い引っ張られても、以上の引き出し部のたるみ分でそれを吸収でき、断線や接触不良を回避できるとともに、ホルダの安定した動作を実現することができる。 According to the autofocus actuator of the present invention having the above-described configuration, the leaf spring need not be bent for the electrode portion, and the leaf spring itself is not conducted. There is no need to consider the insulation. Further, the pair of leaf springs can be the same shape leaf springs, which can reduce the cost and can be easily assembled. Furthermore, even if the coil winding lead portion is pulled with the displacement of the holder, it can be absorbed by the slack of the lead portion described above, so that disconnection and poor contact can be avoided, and stable operation of the holder is realized. be able to.

本発明のオートフォーカス用アクチュエータでは、前記端子部は、前記下板バネと下側支持枠との間に配設されたシート状電極に設けられていることが好ましい。このような構成によれば、板バネと独立して設けたシート状電極を用いてコイルへの通電を行うようにしているので、端子部の設置が容易に行える。 The autofocus actuator of the present invention, the terminal portion is preferably provided in a sheet-like electrode that is disposed between the lower plate spring and the lower support frame. According to such a configuration, since the coil is energized using the sheet-like electrode provided independently of the leaf spring, the terminal portion can be easily installed.

また、本発明のオートフォーカス用アクチュエータでは、前記コイルの巻き線の前記引き出し部の前記ホルダの突起に巻回した部分および前記シート状電極の端子部との接続部の少なくともいずれか一方に、応力緩和剤を塗布することが好ましい。これにより、引き出し部のホルダの突起に巻回した部分や端子部との接続部の一部に応力が集中することを防ぐことができ、断線や接触不良をより確実に回避することができる。 In the autofocus actuator of the present invention, stress is applied to at least one of a portion of the coil winding wound around the protrusion of the holder and a connection portion between the terminal portion of the sheet-like electrode. It is preferable to apply a relaxation agent. Thereby, it can prevent that stress concentrates on the part wound around the protrusion of the holder of the drawer | drawing-out part, or a part of connection part with a terminal part, and can avoid a disconnection and a contact failure more reliably.

また、本発明のオートフォーカス用アクチュエータでは、前記突起を前記ホルダのフランジ部の下板バネ側端面にほぼ等間隔で少なくとも３つ以上設け、それらの突起の２つに前記コイルの引き出し部を巻回するとともに、残りの突起にバランス保持手段を設けることが好ましい。これにより、ホルダの変位を安定的に行うことができる。 In the autofocus actuator of the present invention, at least three or more projections are provided at substantially equal intervals on the lower plate spring side end surface of the flange portion of the holder, and the coil drawing portion is wound around the two projections. It is preferable to provide balance holding means on the remaining protrusions while turning. Thereby, the displacement of a holder can be performed stably.

この場合、前記バランス保持手段は、前記コイルの巻き線と同じワイヤーを用いたダミーワイヤーであることが好ましい。また、前記ダミーワイヤーは、前記コイルの巻き線の引き出し部と同様に、一端が前記突起に巻回され、他端が前記シート状電極に接続されていることが好ましい。このように巻き線と同じワイヤーを用いて、本来の通電用の巻き線の引き出し部と同じ構造をとることにより、簡単かつ確実なバランス保持手段を実現することができる。 In this case, it is preferable that the balance holding means is a dummy wire using the same wire as the coil winding. Moreover, it is preferable that one end of the dummy wire is wound around the protrusion and the other end is connected to the sheet-like electrode, similarly to the coil winding lead portion. Thus, by using the same wire as the winding and adopting the same structure as the lead portion of the original winding for energization, a simple and reliable balance holding means can be realized.

上述したおよび他の本発明の構成、作用および効果は、図面を参照して行う以下の好適実施形態の説明からより明らかとなるであろう。 The above-described and other configurations, operations, and effects of the present invention will become more apparent from the following description of preferred embodiments with reference to the drawings.

以下、本発明のオートフォーカス用アクチュエータについて添付図面に示す好適実施形態に基づいて詳細に説明する。 Hereinafter, the autofocus actuator of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.

図１は、本発明に係るオートフォーカス用アクチュエータの実施形態の外観を示す斜視図である。図２は、図１に示すオートフォーカス用アクチュエータの分解斜視図である。図３は、図１に示すオートフォーカス用アクチュエータの断面概略図である。 FIG. 1 is a perspective view showing an appearance of an embodiment of an autofocus actuator according to the present invention. FIG. 2 is an exploded perspective view of the autofocus actuator shown in FIG. FIG. 3 is a schematic cross-sectional view of the autofocus actuator shown in FIG.

本実施形態にかかるオートフォーカス用アクチュエータは、図１、図２および図３に示すように、一端にレンズ組立体１００が取り付けられる筒状部１１とその筒状部１１の他端の外周に設けられたフランジ部１２とを有するホルダ１０と；ホルダ１０のフランジ部１２に、筒状部１１の周囲に間隔をおいて設けられたコイル２０と；ホルダ１０の筒状部１１が挿通する挿通孔３５を有する内筒部３１と、内筒部３１の外側に所定間隔をおいて設けられた外筒部３２と、内筒部３１と外筒部３２のホルダ１０のフランジ部１２と反対側の端部が一体に連結する連結部３４とを有し、内筒部３１と外筒部３２との間にある所定間隔のスペースにコイル２０を収容するように構成された円形状のヨーク３０と；円形状のヨーク３０の外筒部３２の内周面の磁石取付面３３にコイル２０と間隔を置いて対向するように配置された複数の永久磁石４０と；永久磁石４０の円形状のヨーク３０の連結部３４と反対側の面に当接した状態で、複数の永久磁石４０を連結するように配置された磁性部材５０と；ホルダ１０の筒状部１１の光軸方向両側に設けられ、ホルダ１０を径方向に位置決めした状態で光軸方向に変位可能に支持する上側板バネ６０Ｕおよび下側板バネ６０Ｌから成る一対の板バネ６０と；上側板バネ６０Ｕを、ホルダ１０との間で挟持するように、ホルダ１０と嵌合するストッパ７０と；一対の板バネ６０のそれぞれの光軸方向外側に設けられ、板バネ６０をヨーク３０の光軸方向両端面との間でそれぞれ挟持するとともに、少なくともホルダ１０に取り付けられたレンズ組立体１００に対応する部分にそれぞれ開口８０ａ、８５ａを有する一対の支持枠をなすカバー８０およびベース８５と；下側板バネ６０Ｌとベース８５との間に、コイル２０に電力を供給するために設けられたシート状電極９０と；から構成されている。 As shown in FIGS. 1, 2, and 3, the autofocus actuator according to this embodiment is provided on the outer periphery of the cylindrical portion 11 to which the lens assembly 100 is attached at one end and the other end of the cylindrical portion 11. A holder 10 having a flange portion 12 formed; a coil 20 provided in the flange portion 12 of the holder 10 with a space around the tubular portion 11; and an insertion hole through which the tubular portion 11 of the holder 10 is inserted. 35, an outer cylinder part 32 provided at a predetermined interval on the outer side of the inner cylinder part 31, and the inner cylinder part 31 and the outer cylinder part 32 on the opposite side to the flange part 12 of the holder 10. A circular yoke 30 having a connecting portion 34 whose end portions are integrally connected, and configured to house the coil 20 in a predetermined space between the inner cylindrical portion 31 and the outer cylindrical portion 32; The outer cylindrical portion 32 of the circular yoke 30 A plurality of permanent magnets 40 arranged so as to face the magnet mounting surface 33 on the circumferential surface at a distance from each other; abutting against a surface of the permanent magnet 40 opposite to the connecting portion 34 of the circular yoke 30 In this state, the magnetic member 50 arranged to connect the plurality of permanent magnets 40; provided on both sides of the cylindrical portion 11 of the holder 10 in the optical axis direction, and the optical axis in a state where the holder 10 is positioned in the radial direction A pair of leaf springs 60 comprising an upper leaf spring 60 U and a lower leaf spring 60 L that are displaceably supported in the direction; and a stopper 70 that fits the holder 10 so as to sandwich the upper leaf spring 60 U with the holder 10. A lens set provided on the outer side in the optical axis direction of each of the pair of leaf springs 60, holding the leaf spring 60 between both end surfaces in the optical axis direction of the yoke 30, and attached to at least the holder 10. A cover 80 and a base 85 forming a pair of support frames having openings 80a and 85a at portions corresponding to the body 100; provided between the lower leaf spring 60L and the base 85 to supply power to the coil 20. Sheet-like electrode 90;

以下、各構成部材の詳細について説明する。なお、本明細書においては、上及び下の文言を適宜使用するが、各部材の説明において、図２に示す矢印の向きを上方向とし、この矢印の逆の向きを下方向とする。 Hereinafter, details of each component will be described. In the present specification, the terms “upper” and “lower” are used as appropriate. In the description of each member, the direction of the arrow shown in FIG. 2 is the upward direction, and the opposite direction of the arrow is the downward direction.

ホルダ１０は、合成樹脂からなる成型品であり、一端（上端）にレンズ組立体１００が取り付けられる円筒状の筒状部１１とその筒状部１１の他端（下端）の外周に一体に設けられた円形のフランジ部１２とを有する。図３に示すように、ホルダ１０の筒状部１１は、中空になっており、その上部の内周面には、レンズ組立体１００の外周に形成された雄ネジ部と螺合するための雌ネジ部が形成されている。また、フランジ部１２の上面（筒状部１１側の面）の周縁部には、コイル２０を位置決めした状態で接着するための段部１２ａが設けられている（図３参照）。また、フランジ部１２の下面には、下側板バネ６０を位置決めかつ装着するための、リング状の凸部（段部）１５が同心状に形成されている。この凸部１５には、光軸方向に延出する３本の細い突起１３が等間隔で該凸部１５と一体に形成されている。 The holder 10 is a molded product made of synthetic resin, and is integrally provided on the outer periphery of a cylindrical cylindrical portion 11 to which the lens assembly 100 is attached at one end (upper end) and the other end (lower end) of the cylindrical portion 11. And a circular flange portion 12 formed. As shown in FIG. 3, the cylindrical portion 11 of the holder 10 is hollow, and the upper inner peripheral surface thereof is screwed with a male screw portion formed on the outer periphery of the lens assembly 100. A female screw portion is formed. Further, a stepped portion 12a for bonding the coil 20 in a positioned state is provided on the peripheral portion of the upper surface of the flange portion 12 (the surface on the cylindrical portion 11 side) (see FIG. 3). Further, on the lower surface of the flange portion 12, a ring-shaped convex portion (step portion) 15 for positioning and mounting the lower leaf spring 60 is formed concentrically. On the convex portion 15, three thin protrusions 13 extending in the optical axis direction are formed integrally with the convex portion 15 at equal intervals.

コイル２０は、前述したように、ホルダ１０のフランジ部１２の上面の段部１２ａに、ホルダ１０の筒状部１１の周囲と間隔を置くようにして設けられている。本実施形態では、コイル２０は、銅線の表面に被覆したものを、１０回巻の層と９回巻の層を交互に積層する異数巻きによって形成され、その断面は円形状をなす空芯コイルである。また、このコイル２０は、その巻き線の両端の引き出し部２１がフランジ部１２側に位置するように巻かれている。このような空芯コイルがホルダ１０のフランジ部１２の上面の段部に接着剤により固定されている。なお、本発明ではコイル２０は、以上のような空芯コイルに限られず、筒状部１１に直接コイルを、巻回したものであってもよい。 As described above, the coil 20 is provided on the step portion 12 a on the upper surface of the flange portion 12 of the holder 10 so as to be spaced from the periphery of the cylindrical portion 11 of the holder 10. In the present embodiment, the coil 20 is formed by coating the surface of a copper wire with different numbers of turns in which a layer of 10 turns and a layer of 9 turns are alternately stacked, and the cross section is an empty space having a circular shape. It is a core coil. Further, the coil 20 is wound so that the leading portions 21 at both ends of the winding are positioned on the flange portion 12 side. Such an air core coil is fixed to the step on the upper surface of the flange portion 12 of the holder 10 with an adhesive. In the present invention, the coil 20 is not limited to the air core coil as described above, and may be a coil that is directly wound around the cylindrical portion 11.

図４に示されているように、ヨーク３０は、ホルダ１０の筒状部１１が挿通する挿通孔３５を有する円筒状の内筒部３１と、内筒部３１の外側に所定間隔をおいて設けられた円筒状の外筒部３２と、内筒部３１と外筒部３２のホルダ１０のフランジ部１２と反対側の端部が一体に連結する連結部３４とを有し、内筒部３１と外筒部３２との間にある所定間隔のスペースにコイル２０を収容するように構成されている。 As shown in FIG. 4, the yoke 30 includes a cylindrical inner cylinder portion 31 having an insertion hole 35 through which the cylindrical portion 11 of the holder 10 is inserted, and a predetermined interval on the outer side of the inner cylinder portion 31. A cylindrical outer tube portion 32 provided; and an inner tube portion 31 and a connecting portion 34 integrally connected to the end of the outer tube portion 32 opposite to the flange portion 12 of the holder 10. The coil 20 is accommodated in a space of a predetermined interval between the outer cylinder portion 31 and the outer cylinder portion 32.

このヨーク３０は、磁性材料である例えば鉄の表面をニッケルメッキしたものからなっている。ホルダ１０の筒状部１１を、光軸方向に移動可能な状態で内筒部３１の挿通孔３５に挿入するために、内筒部３１の挿通孔３５の直径は、ホルダ１０の筒状部１１の外周面の直径より大きく、ホルダ１０のフランジ部１２の周縁部の直径よりは小さくなるように形成されている。 The yoke 30 is made of a magnetic material, for example, an iron surface nickel-plated. In order to insert the cylindrical portion 11 of the holder 10 into the insertion hole 35 of the inner cylindrical portion 31 in a state where the cylindrical portion 11 is movable in the optical axis direction, the diameter of the insertion hole 35 of the inner cylindrical portion 31 is the cylindrical portion of the holder 10. 11 is larger than the diameter of the outer peripheral surface of the holder 10 and smaller than the diameter of the peripheral edge of the flange portion 12 of the holder 10.

また、図２ないし図４に示すように、連結部３４を基準とした内筒部３１の光軸方向の高さは外筒部３２の光軸方向の高さより低くなるように形成されている。 Further, as shown in FIGS. 2 to 4, the height in the optical axis direction of the inner cylinder portion 31 with respect to the connecting portion 34 is formed to be lower than the height in the optical axis direction of the outer cylinder portion 32. .

また、円形状のヨーク３０の外筒部３２の内周面の磁石取付面３３には、コイル２０と間隔を置いて対向するように複数（４片）の永久磁石４０が配置されている。これらの永久磁石４０は、それぞれ、円形の磁石取付面３３の形状に沿うように略９０度の円弧状に湾曲した永久磁石から形成されている。これらの永久磁石４０は、ネオジウム磁石からなり、例えば、磁石取付面３３に当接する側の曲面をＳ極、その曲面と略対向する曲面をＮ極となるように磁化されている。これらの円弧状に湾曲した永久磁石４０が円形状のヨーク３０に取り付けられることによって、ヨーク３０の内筒部３１の外周面はＳ極となり、円弧状に湾曲した永久磁石４０から内筒部３１に向かう磁界が形成される。この磁界により、永久磁石４０と内筒部外周面のスペースに位置するコイル２０に通電した際に、該コイルには前記磁界とコイルを流れる電流により発生する磁界との相互作用により、光軸方向の力が作用し、ホルダ１０を光軸方向に移動させることが可能になる。なお、永久磁石の個数は４片に限定されることなく、それ以外の複数個の磁石でもよく、また１個の例えばＣ字状の永久磁石を使用してもよい。 A plurality (four pieces) of permanent magnets 40 are arranged on the magnet mounting surface 33 on the inner peripheral surface of the outer cylindrical portion 32 of the circular yoke 30 so as to face the coil 20 with a space therebetween. Each of these permanent magnets 40 is formed of a permanent magnet that is curved in an arc shape of approximately 90 degrees along the shape of the circular magnet mounting surface 33. These permanent magnets 40 are made of neodymium magnets, and are magnetized so that, for example, the curved surface on the side contacting the magnet mounting surface 33 is an S pole, and the curved surface substantially opposite to the curved surface is an N pole. By attaching these arcuately curved permanent magnets 40 to the circular yoke 30, the outer peripheral surface of the inner cylinder part 31 of the yoke 30 becomes the S pole, and the arcuately curved permanent magnets 40 to the inner cylinder part 31. A magnetic field toward is formed. When the coil 20 located in the space between the permanent magnet 40 and the outer peripheral surface of the inner cylinder portion is energized by this magnetic field, the coil is caused to interact with the magnetic field and the magnetic field generated by the current flowing through the coil in the direction of the optical axis. Thus, the holder 10 can be moved in the optical axis direction. Note that the number of permanent magnets is not limited to four pieces, and a plurality of other magnets may be used, or one C-shaped permanent magnet may be used.

ところで、以上のような円形状のヨーク３０では、図５中に示されている矢印のように、円形状のヨーク３０の連結部３４と反対側の開放部において、隣接する永久磁石４０間の下方に磁束が漏れてしまう。この磁束の漏れを防ぐ防止手段を設けることによって、ホルダ１０の駆動力を増加させることができる。 By the way, in the circular yoke 30 as described above, between the adjacent permanent magnets 40 at the open portion opposite to the connecting portion 34 of the circular yoke 30 as indicated by the arrow shown in FIG. Magnetic flux leaks downward. By providing the prevention means for preventing the leakage of the magnetic flux, the driving force of the holder 10 can be increased.

本発明では、この磁束漏れの防止手段として、永久磁石４０の下側端面（円形状のヨーク３０の連結部３４と反対側の面）に当接した状態で複数の永久磁石４０を連結するように磁性部材５０を配置している。この磁性部材５０を設けることによって、図６に示すように、下方に漏れる磁束を減少させ、永久磁石４０から円形状のヨーク３０の内筒部３１に向かう磁束が増加するようにしている。図７に示すように、本実施形態では、円形リング状の磁性部材５０を永久磁石４０に吸着させた上でそれらと接着剤で固定されている。図６に示すように、リング形状を有する磁性部材５０の幅は、各円弧状に湾曲した永久磁石４０の半径方向の厚さに等しくなっている。それにより、ヨーク３０に収容されるコイル２０の配置を妨げることがない。また、リング形状を有する磁性部材５０の開放部側の面は、取り付けられた状態で、ヨーク３０の外筒部３２の端面より下側に位置するようになっている。 In the present invention, as a means for preventing the leakage of magnetic flux, a plurality of permanent magnets 40 are connected in contact with the lower end surface of the permanent magnet 40 (the surface opposite to the connecting portion 34 of the circular yoke 30). A magnetic member 50 is disposed on the surface. By providing the magnetic member 50, as shown in FIG. 6, the magnetic flux leaking downward is reduced, and the magnetic flux from the permanent magnet 40 toward the inner cylindrical portion 31 of the circular yoke 30 is increased. As shown in FIG. 7, in the present embodiment, a circular ring-shaped magnetic member 50 is adsorbed to a permanent magnet 40 and then fixed thereto with an adhesive. As shown in FIG. 6, the width of the ring-shaped magnetic member 50 is equal to the radial thickness of the permanent magnet 40 curved in an arc shape. Thereby, arrangement | positioning of the coil 20 accommodated in the yoke 30 is not prevented. Further, the surface on the open side of the magnetic member 50 having a ring shape is positioned below the end surface of the outer cylinder portion 32 of the yoke 30 in the attached state.

前記磁性材料は、鉄、ニッケル、コバルトおよびそれらの合金からなる磁性材料から形成され、本実施形態では冷間圧延鋼板を使用している。 The said magnetic material is formed from the magnetic material which consists of iron, nickel, cobalt, and those alloys, and the cold rolled steel plate is used in this embodiment.

図８に示すように、各板バネ（上側板バネ６０Ｕ、下側板バネ６０Ｌ）は、金属の薄板からなり、内環部６１と、内環部６１と所定の間隔をおいて設けられた外環部６２と、内環部６１と外環部６２とを接続する複数の連結部６３とを有するジンバルバネ状に形成されている。外環部６２が固定された状態で、内環部６１に荷重がかかった場合、連結部６３が弾性変形することによって、内環部６１が接着されるホルダ１０を径方向に位置決めした状態で光軸方向に変位可能に支持する。 As shown in FIG. 8, each leaf spring (upper leaf spring 60U, lower leaf spring 60L) is made of a thin metal plate and has an inner ring portion 61 and an outer ring portion provided at a predetermined interval from the inner ring portion 61. The ring portion 62 is formed in a gimbal spring shape having a plurality of connecting portions 63 that connect the inner ring portion 61 and the outer ring portion 62. When a load is applied to the inner ring part 61 in a state where the outer ring part 62 is fixed, the connecting part 63 is elastically deformed, and the holder 10 to which the inner ring part 61 is bonded is positioned in the radial direction. It is supported so that it can be displaced in the optical axis direction.

ホルダ１０の上面には、組立の際、上側板バネ６０Ｕを位置決めするための段部１６が形成されている。この段部１６の横断面形状は、内環部６１の内周とほぼ同じ形状を有している。ホルダ１０の上面に上側板バネ６０Ｕの内環部６１が段部１６と嵌合した状態で載置され、さらにその上にストッパ７０が取り付けられることによって、内環部６１はホルダ１０の上面とストッパの下面との間に挟持された状態でホルダ１０に接着される。また、外環部６２は、カバー８０の下面とヨーク３０の連結部３４の上面との間で挟持された状態でカバー８０およびヨーク３０に接着される。 On the upper surface of the holder 10, a step portion 16 is formed for positioning the upper leaf spring 60U during assembly. The cross-sectional shape of the step portion 16 has substantially the same shape as the inner periphery of the inner ring portion 61. The inner ring portion 61 of the upper leaf spring 60U is placed on the upper surface of the holder 10 in a state where the upper ring spring 60U is fitted to the step portion 16, and the stopper 70 is attached thereon, so that the inner ring portion 61 is connected to the upper surface of the holder 10. It is bonded to the holder 10 while being sandwiched between the lower surface of the stopper. Further, the outer ring portion 62 is bonded to the cover 80 and the yoke 30 while being sandwiched between the lower surface of the cover 80 and the upper surface of the connecting portion 34 of the yoke 30.

前述したように、ホルダ１０のフランジ側端部、すなわちフランジ部の下面にも、組立の際下側板バネ６０Ｌを位置決めするための段部１５が形成されており、その横断面形状は内環部６１の内周と同じ形状を有しており、内環部６１が位置決めされた状態で接着される。また外環部６２は、円形状のヨーク３０の外筒部３２の端面とベース８５の上面との間で挟持された状態でベース８５およびヨーク３０に接着される。 As described above, the flange-side end portion of the holder 10, that is, the lower surface of the flange portion is also formed with the step portion 15 for positioning the lower leaf spring 60 L during assembly, and the cross-sectional shape thereof is the inner ring portion. The inner ring 61 has the same shape as the inner periphery, and is bonded in a state where the inner ring portion 61 is positioned. The outer ring portion 62 is bonded to the base 85 and the yoke 30 while being sandwiched between the end surface of the outer cylindrical portion 32 of the circular yoke 30 and the upper surface of the base 85.

図９に示すように、下側板バネ６０Ｌとベース８５との間にコイル２０に電力を供給するために設けられたシート状電極９０は、ポリイミドのシート材からなる略円形リング状に形成したリング状部９１と、リング状部９１から径方向外側に延出する延出部９２とを有する。 As shown in FIG. 9, a sheet-like electrode 90 provided to supply power to the coil 20 between the lower leaf spring 60L and the base 85 is a ring formed in a substantially circular ring shape made of a polyimide sheet material. And a projecting portion 92 extending radially outward from the ring-shaped portion 91.

シート状電極９０の一面には、銅からなる端子部９３が延出部９２からリング状部９１にかけて２本設けられている。また、リング状部９１において、２本の端子部９３の先端間に、後述するダミーワイヤー２３をはんだ付けするためのダミー端子部９５が設けられている。 Two terminal portions 93 made of copper are provided on one surface of the sheet-like electrode 90 from the extending portion 92 to the ring-shaped portion 91. In the ring-shaped portion 91, a dummy terminal portion 95 for soldering a dummy wire 23 described later is provided between the tips of the two terminal portions 93.

さらにシート状電極９０の他面には、シート状電極９０を、下側板バネ６０Ｌの外環部６２の下面に接着するための粘着層（図示せず）が、リング状部９１と、延出部９２のリング状部との接続部近傍と、延出部９２の先端部近傍に設けられている。 Further, on the other surface of the sheet-like electrode 90, an adhesive layer (not shown) for bonding the sheet-like electrode 90 to the lower surface of the outer ring portion 62 of the lower leaf spring 60L is extended with the ring-shaped portion 91. It is provided in the vicinity of the connection portion of the portion 92 with the ring-shaped portion and in the vicinity of the distal end portion of the extension portion 92.

さらに、延出部９２は後述するベース８５の挿通孔８８を通して、支持枠の外部に延出し、センサー基板（図示せず）に接続される。挿通孔８８に延出部９２を挿通するために、リング状部９１に対して延出部９２を略９０度折り曲げる必要がある。この折り曲げによって、端子部９３が破損することを防ぐため、端子部９３の上にポリイミドからなるカバーフィルム９４が設けられている。 Further, the extending portion 92 extends to the outside of the support frame through an insertion hole 88 of the base 85 described later and is connected to a sensor substrate (not shown). In order to insert the extension 92 into the insertion hole 88, it is necessary to bend the extension 92 approximately 90 degrees with respect to the ring-shaped portion 91. In order to prevent the terminal part 93 from being damaged by this bending, a cover film 94 made of polyimide is provided on the terminal part 93.

シート状電極９０のリング部９１上に設けられた端子部９３にコイル２０の引き出し部２１の先端をはんだ付けすることでコイル２０に電力を供給することができる。しかし、ホルダ１０が変位することによって引き起こされる引き出し部２１と他の部材との好ましくない接触およびはんだ付けされた先端部の応力集中が生じる。そこで、図１０に示すようにコイル２０の巻き線の両側の引き出し部２１を、ホルダ１０のフランジ部１２の下面の段部１５に設けられた３本の細い突起１３に巻き付けた上で、引き出し部２１の先端がシート状電極９０の端子部９３にはんだ付けされる。 Electric power can be supplied to the coil 20 by soldering the leading end of the lead portion 21 of the coil 20 to the terminal portion 93 provided on the ring portion 91 of the sheet-like electrode 90. However, undesired contact between the drawer portion 21 and other members caused by the displacement of the holder 10 and stress concentration at the soldered tip end occur. Therefore, as shown in FIG. 10, the drawing portions 21 on both sides of the winding of the coil 20 are wound around the three thin protrusions 13 provided on the step portion 15 on the lower surface of the flange portion 12 of the holder 10 and then drawn out. The tip of the portion 21 is soldered to the terminal portion 93 of the sheet electrode 90.

これらの突起１３は、組立状態で、後述するベースの底板部８６の上面に接触しない程度の高さを有する円筒形状をなしている。 These projections 13 have a cylindrical shape having a height that does not contact the upper surface of the base plate 86 of the base, which will be described later, in the assembled state.

引き出し部２１は、コイル２０からフランジ部１２の縁部に設けられている凹部１４（図１２参照）を通して、フランジ部１２の下面側に延出され、突起１３に巻き付けられる。 The lead portion 21 extends from the coil 20 to the lower surface side of the flange portion 12 through a recess 14 (see FIG. 12) provided at the edge portion of the flange portion 12, and is wound around the protrusion 13.

突起１３とはんだ付け部２２との間にある引き出し部２１は、ホルダ１０の変位しても、引張応力が生じないように、たるみを持たせた状態で取り付けられている。 The lead-out portion 21 between the protrusion 13 and the soldering portion 22 is attached in a slack state so that no tensile stress is generated even when the holder 10 is displaced.

さらに、本実施形態では、図１１に示すように、ホルダ１０の突起１３に引き出し部２１が巻き付けられる部分と、シート状電極９０の端子部９３に引き出し部２１の先端がはんだ付けされたはんだ付け部２２とを包み込むように応力緩和剤２４が設けられており、引き出し部２１の一部に応力が集中することを防ぐことができる。 Furthermore, in the present embodiment, as shown in FIG. 11, a portion where the lead portion 21 is wound around the protrusion 13 of the holder 10 and soldering in which the tip of the lead portion 21 is soldered to the terminal portion 93 of the sheet electrode 90. The stress relaxation agent 24 is provided so as to wrap the portion 22, and stress can be prevented from concentrating on a part of the drawer portion 21.

さらに、図１２に示すように、突起１３は、フランジ部１２の下面にほぼ等間隔で３つ設けられており、それぞれ、フランジ部１２の下面に接着される下側板バネ６０Ｌの内環部６１の内縁にある略半円状の凹部６６（図８参照）の位置に挿入される。 Further, as shown in FIG. 12, three protrusions 13 are provided on the lower surface of the flange portion 12 at substantially equal intervals. Each of the inner ring portions 61 of the lower leaf spring 60 L bonded to the lower surface of the flange portion 12. Is inserted at the position of a substantially semicircular recess 66 (see FIG. 8) at the inner edge.

３つの突起１３のうち２つにコイル２０の引き出し部２１を巻き付けられている。残りの１つには、バランス保持手段を設けられている。 The lead portion 21 of the coil 20 is wound around two of the three protrusions 13. The remaining one is provided with balance holding means.

このバランス保持手段は、コイル２０の巻き線と同じワイヤーを用いたダミーワイヤー２３からなる。ダミーワイヤー２３の一端は突起１３に巻き付けられ、他端はシート状電極９０のダミー端子部９５にはんだ付けされる。これによって、ホルダ１０のバランスを保つことができ、安定した姿勢で動作可能となる。 This balance holding means includes a dummy wire 23 using the same wire as the winding of the coil 20. One end of the dummy wire 23 is wound around the protrusion 13, and the other end is soldered to the dummy terminal portion 95 of the sheet-like electrode 90. Thereby, the balance of the holder 10 can be maintained, and it becomes possible to operate in a stable posture.

ダミーワイヤー２３が突起１３に巻き付けられた部分とダミーワイヤー２３のはんだ付け部とを包み込むように応力緩和剤２４が設けられており、ダミーワイヤー２３の一部に応力が集中することを防ぐとともにホルダ１０のバランスを保つことができる。 A stress relieving agent 24 is provided so as to wrap the portion around which the dummy wire 23 is wound around the protrusion 13 and the soldered portion of the dummy wire 23, and prevents the stress from concentrating on a part of the dummy wire 23 and the holder. Ten balances can be maintained.

なお、本発明にあっては、以上のようなシート状電極９０を使用する代わりに、例えば、ホルダ１０の変位に伴って変位しない下側板バネ６０Ｌの外環部６２の下面（ホルダ１０と反対側の面）の変位しない部分（例えば、外環部６２）の一部に、絶縁材を介して、電源部と接続する端子部を形成し、そこにコイル２０の引き出し部２１の端部を接続するようにしてもよい。 In the present invention, instead of using the sheet electrode 90 as described above, for example, the lower surface of the outer ring portion 62 of the lower leaf spring 60L that does not displace with the displacement of the holder 10 (opposite to the holder 10). A terminal portion connected to the power supply portion is formed on a part of the non-displaceable portion (for example, the outer ring portion 62) of the side surface) via an insulating material, and the end portion of the lead portion 21 of the coil 20 is provided there. You may make it connect.

図１３に示すように、ストッパ７０はリング状に成形された合成樹脂からなり、上側板バネ６０Ｕの内環部６１をホルダ１０との間に挟持した状態で、内周縁はホルダ１０の上面部の段部１６と嵌合し接着される。 As shown in FIG. 13, the stopper 70 is made of a synthetic resin molded into a ring shape, and the inner peripheral edge is the upper surface portion of the holder 10 with the inner ring portion 61 of the upper leaf spring 60 U sandwiched between the holder 10. The step 16 is fitted and bonded.

３個の開口７１の縁部の一部は、上側板バネ６０Ｕの内環部６１の外縁にある略半円状の凹部６５（図８参照）の形状と一致するように位置決めされた状態で組み立てられる。したがって、上面側から開口７１および略半円状の凹部６５を通して、ホルダ１０の筒状部１１とヨーク３０の内筒部３１とのクリアランスを確認することができる。 A part of the edge of the three openings 71 is positioned so as to coincide with the shape of the substantially semicircular recess 65 (see FIG. 8) at the outer edge of the inner ring part 61 of the upper leaf spring 60U. Assembled. Therefore, the clearance between the cylindrical portion 11 of the holder 10 and the inner cylindrical portion 31 of the yoke 30 can be confirmed through the opening 71 and the substantially semicircular concave portion 65 from the upper surface side.

図２に示すように、上側板バネ６０Ｕの外環部６２の一部をヨーク３０の連結部３４との間に挟持するように組み立てられるカバー８０は、開口部８０ａを有する略長方形状の上板部８１とその上板部８１の角部に、上板部８１に対して垂直かつ下向きにそれぞれ設けられている柱部８２とを有する。 As shown in FIG. 2, the cover 80 assembled so as to sandwich a part of the outer ring portion 62 of the upper leaf spring 60U with the connecting portion 34 of the yoke 30 has a substantially rectangular upper shape having an opening 80a. The plate portion 81 and the column portion 82 provided at the corner portion of the upper plate portion 81 and perpendicular to the upper plate portion 81 and downward are provided.

下側板バネ６０Ｌの外環部６２の一部をヨーク３０の外筒部３２の端面との間に挟持するように組み立てられるベース８５は、開口部８５ａを有する略長方形状の底板部８６とその底板部８６の角部に、底板部８６に対して垂直かつ上向きにそれぞれ設けられている柱部８７とを有する。 The base 85 assembled so as to sandwich a part of the outer ring portion 62 of the lower leaf spring 60L between the end surface of the outer cylinder portion 32 of the yoke 30 includes a substantially rectangular bottom plate portion 86 having an opening 85a and the base plate portion 86. At the corners of the bottom plate portion 86, there are column portions 87 provided vertically and upward with respect to the bottom plate portion 86.

それぞれ対応する位置にあるカバー８０の柱部８２とベース８５の柱部８７は嵌合するようになっており、組立の際、容易に位置決めした状態で接着することができる。 The column portion 82 of the cover 80 and the column portion 87 of the base 85 are respectively fitted to each other, and can be bonded in an easily positioned state during assembly.

図１４に示すように、カバー８０の開口部８０ａの内縁には、３つの略三角形状の凸部２０１が設けられており、ストッパ７０の外縁に設けられた３つの略三角形状の凹部７２と隙間がある状態で嵌合するようにそれぞれ配置されている。これによって、ストッパ７０と接着されているホルダ１０の円周方向の回転を制限するため、板バネ６０の連結部６３の塑性変形、部材間の接着面のはく離、コイル２０の引き出し部２１の破断などといった問題を引き起こすことなく、レンズ組立体１００をホルダ１０に容易に螺合することができる。 As shown in FIG. 14, three substantially triangular convex portions 201 are provided on the inner edge of the opening 80 a of the cover 80, and three substantially triangular concave portions 72 provided on the outer edge of the stopper 70. Each is arranged so as to be fitted with a gap. Thereby, in order to limit the rotation of the holder 10 bonded to the stopper 70 in the circumferential direction, plastic deformation of the connecting portion 63 of the leaf spring 60, peeling of the bonding surface between the members, and breaking of the drawing portion 21 of the coil 20 are performed. The lens assembly 100 can be easily screwed into the holder 10 without causing problems such as.

また、ストッパ７０の外縁の上方には、開口部８０ａから径方向内向きに突出した突出部２０２が設けられており、衝撃などによりホルダ１０に大きな力が加わっても、この突出部２０２がストッパ７０に当接することによって、ホルダ１０の変位を制限し、ホルダ１０を支持している板バネ６０の連結部６３の塑性変形、部材間の接着面のはく離、コイル２０の引き出し部２１の破断などを防ぐことができる。 Further, a protrusion 202 protruding radially inward from the opening 80a is provided above the outer edge of the stopper 70. Even if a large force is applied to the holder 10 due to an impact or the like, the protrusion 202 is stopped by the stopper 70. 70, the displacement of the holder 10 is limited, plastic deformation of the connecting portion 63 of the leaf spring 60 supporting the holder 10, peeling of the adhesive surface between members, breakage of the drawing portion 21 of the coil 20, etc. Can be prevented.

図２に示すように、ベース８５の底板部８６には、組立の際に、シート状電極９０の延出部９２を挿通するための挿通孔８８が設けられている。 As shown in FIG. 2, the bottom plate portion 86 of the base 85 is provided with an insertion hole 88 through which the extension portion 92 of the sheet-like electrode 90 is inserted during assembly.

さらに、ベース８５の底板部８６の開口部８５ａ近傍に、突起８９がほぼ等間隔に３つ設けられており（図３参照）、組立状態では、その先端はホルダ１０のフランジ部１２の下面に接着されている下側板バネ６０Ｌの連結部６３に当接する。突起８９の高さは、ベース８５の底板部８６上面から下側板バネ６０Ｌまでの距離より長いため、ホルダ１０は上に変位した状態となり、支持している各板バネ６０には下向きの弾性力が働き、ホルダ１０には常にバックテンションが働いている状態となっている。 Further, three protrusions 89 are provided at almost equal intervals in the vicinity of the opening 85a of the bottom plate portion 86 of the base 85 (see FIG. 3), and in the assembled state, the tip is on the lower surface of the flange portion 12 of the holder 10. It contacts the connecting portion 63 of the bonded lower leaf spring 60L. Since the height of the protrusion 89 is longer than the distance from the upper surface of the bottom plate portion 86 of the base 85 to the lower leaf spring 60L, the holder 10 is displaced upward, and the supporting leaf springs 60 have a downward elastic force. The holder 10 is always in a back tension state.

また、ベースの底板部８６には、円形の開口８６ａがほぼ等間隔に３つ設けられており、これらの開口を通じて、シート状電極９０上のはんだ付け部２２の状態を検査することができる。 Further, the bottom plate portion 86 of the base is provided with three circular openings 86a at almost equal intervals, and the state of the soldered portion 22 on the sheet-like electrode 90 can be inspected through these openings.

以下、本発明のオートフォーカス用アクチュエータの組立手順について説明する。
[１] ホルダ１０のフランジ部１２の上面の段部１２ａにコイル２０を接着剤で固定する。 The assembly procedure of the autofocus actuator of the present invention will be described below.
[1] The coil 20 is fixed to the step 12a on the upper surface of the flange portion 12 of the holder 10 with an adhesive.

[２] 次に、ヨーク３０の外筒部３２の内周面の磁石取付面３３に４片の永久磁石４０を所定位置に位置決めした後、接着剤で固定する。その状態で、これらの永久磁石４０の下端面にマグネットスペーサを吸着させて接着剤で固定する。 [2] Next, the four permanent magnets 40 are positioned at predetermined positions on the magnet mounting surface 33 on the inner peripheral surface of the outer cylindrical portion 32 of the yoke 30, and then fixed with an adhesive. In this state, a magnet spacer is attracted to the lower end surfaces of these permanent magnets 40 and fixed with an adhesive.

[３] 次に、コイル２０が固定されたホルダ１０と、以上のマグネットスペーサが装着されたヨーク３０とを組み付ける。この際、ホルダ１０の筒状部１１は、ヨーク３０の内筒部３１の挿通孔３５に挿通され、コイル２０はヨーク３０の内筒部３１の外周面と永久磁石４０との間のスペースに収納されるように両者を組み付ける。 [3] Next, the holder 10 to which the coil 20 is fixed and the yoke 30 to which the above magnet spacer is attached are assembled. At this time, the cylindrical portion 11 of the holder 10 is inserted into the insertion hole 35 of the inner cylindrical portion 31 of the yoke 30, and the coil 20 is formed in a space between the outer peripheral surface of the inner cylindrical portion 31 of the yoke 30 and the permanent magnet 40. Assemble both so that they are stored.

[４] [３]の状態でホルダ１０の上下の段部１５および１６にそれぞれ各板バネ６０の内環部６１を嵌合させて接着剤で固定する。 [4] In the state of [3], the inner ring portions 61 of the respective leaf springs 60 are fitted to the upper and lower step portions 15 and 16 of the holder 10 and fixed with an adhesive.

[５] [４]で接着された上側板バネ６０Ｕの上面に、筒状部１１の上面との間で上板バネ６０の内環部６１を挟持した状態で段部１６と嵌合するストッパ７０を接着剤で固定する。 [5] A stopper that fits with the step portion 16 in a state where the inner ring portion 61 of the upper leaf spring 60 is sandwiched between the upper surface of the upper leaf spring 60U bonded in [4] and the upper surface of the cylindrical portion 11. 70 is fixed with an adhesive.

[６] [４]で接着された下側板バネ６０Ｌの外環部６２に、接着層を介してシート状電極９０のリング状部９１を接着する。 [6] The ring-shaped portion 91 of the sheet-like electrode 90 is bonded to the outer ring portion 62 of the lower leaf spring 60L bonded in [4] via an adhesive layer.

[７] コイル２０の引き出し部２１およびダミーワイヤー２３をホルダ１０の突起１３に巻き付けた上で、その先端を[６]で接着されたシート状電極の端子部９３およびダミー端子部９５にはんだ付けされる。また、突起１３に巻き付けた部分およびはんだ付け部には応力緩和剤を塗布する。 [7] After winding the lead portion 21 and the dummy wire 23 of the coil 20 around the protrusion 13 of the holder 10, the tips are soldered to the terminal portion 93 and the dummy terminal portion 95 of the sheet-like electrode bonded in [6]. Is done. Further, a stress relaxation agent is applied to the portion wound around the protrusion 13 and the soldered portion.

[８] 各板バネ６０の外環部６２をヨーク３０との間で挟持するように、[７]までに組み立てられた部品にカバー８０およびベース８５を取り付け、ヨーク３０とカバー８０とに上側板バネの外環部６２を、ヨーク３０の外筒部３２の下端面とベース８５とに下側板バネ６０Ｌの外環部６２をそれぞれ接着する。この時、シート状電極９０の延出部９２をベースの挿通孔８８を通して外部に延出させた状態となるようにする。 [8] The cover 80 and the base 85 are attached to the parts assembled up to [7] so that the outer ring portion 62 of each leaf spring 60 is clamped between the yoke 30 and the yoke 30 and the cover 80. The outer ring part 62 of the side leaf spring is bonded to the lower end surface of the outer cylinder part 32 of the yoke 30 and the base 85, respectively. At this time, the extending portion 92 of the sheet electrode 90 is extended to the outside through the insertion hole 88 of the base.

[９] [８]までに組み立てられた部品の一部であるホルダ１０のネジ部にレンズ組立体１００を螺合させる。 [9] The lens assembly 100 is screwed into the screw portion of the holder 10 which is a part of the parts assembled up to [8].

以下、上記実施形態のオートフォーカス用アクチュエータの作用について説明する。
図３において、磁界の向きが永久磁石からヨーク３０の内筒部３１方向とする。ホルダ１０が初期位置にある状態で、上方からコイル２０を見たときに反時計回りすなわち、図３の断面図において、コイル２０の右の断面では図面の表から裏方向に、左の断面では図面の裏から表方向に電流が流れると上向きの電磁力が生じる。この電磁力と、ホルダ１０の変位に応じて変化する板バネ６０の弾性力とがつりあう状態となるまで、ホルダ１０は変位する。電磁力はコイル２０に流れる電流の量によって制御されるので、ホルダ１０すなわちレンズ組立体１００を任意の位置に変位させることができる。本発明のオートフォーカス用アクチュエータ１のコイル２０に流れる電流の量から得られるレンズ組立体１００の位置情報と、オートフォーカス用アクチュエータ１の下方に位置する検出素子（図示せず）で検出される画像情報とを所定のオートフォーカスアルゴリズムを備える演算部で高速演算し、その結果に基づいてコイル２０に流れる電流を制御することによって、オートフォーカスが可能となる。 The operation of the autofocus actuator of the above embodiment will be described below.
In FIG. 3, the direction of the magnetic field is from the permanent magnet to the inner cylinder portion 31 of the yoke 30. When the coil 20 is viewed from above with the holder 10 in the initial position, that is, counterclockwise, that is, in the cross-sectional view of FIG. When current flows from the back of the drawing in the front direction, an upward electromagnetic force is generated. The holder 10 is displaced until the electromagnetic force and the elastic force of the leaf spring 60 that changes according to the displacement of the holder 10 are balanced. Since the electromagnetic force is controlled by the amount of current flowing through the coil 20, the holder 10, that is, the lens assembly 100 can be displaced to an arbitrary position. Position information of the lens assembly 100 obtained from the amount of current flowing in the coil 20 of the autofocus actuator 1 of the present invention and an image detected by a detection element (not shown) located below the autofocus actuator 1. By performing high-speed calculation of information with a calculation unit having a predetermined autofocus algorithm and controlling the current flowing through the coil 20 based on the result, autofocus can be performed.

以上説明した本発明の好適実施形態にかかるオートフォーカス用アクチュエータによれば、板バネに電極部用の折り曲げ加工などは必要なくなり、また板バネ自体を導通させていないので、板バネと他の部品との絶縁を考慮する必用もない。また、一対の板バネを同じ形状の板バネとすることもでき、コストダウンも可能となる他、組み立ても簡単に行える。さらに、コイルの巻き線の引き出し部がホルダの変位に伴い引っ張られても、以上の引き出し部のたるみ分でそれを吸収でき、断線や接触不良を回避できるとともに、ホルダの安定した動作を実現することができる。 According to the autofocus actuator according to the preferred embodiment of the present invention described above, the leaf spring is not required to be bent for the electrode portion, and the leaf spring itself is not conducted. There is no need to consider insulation. Further, the pair of leaf springs can be the same shape leaf springs, which can reduce the cost and can be easily assembled. Furthermore, even if the coil winding lead portion is pulled with the displacement of the holder, it can be absorbed by the slack of the lead portion described above, so that disconnection and poor contact can be avoided, and stable operation of the holder is realized. be able to.

本発明に係るオートフォーカス用アクチュエータは、以上の実施形態に限定されず、種々の改変や改良が可能である。以下、代表的な改良例について説明する。 The autofocus actuator according to the present invention is not limited to the above embodiment, and various modifications and improvements can be made. Hereinafter, typical improvements will be described.

例えば、以上の実施形態では、ヨークは、円形状の形状をなしており、永久磁石も円弧状の形状の磁石を使用しているが、そのような、円弧状の磁石は、価格が高い上、位置決めに特別な治具が必用となり、製造工程が複雑になるという問題がある。 For example, in the above embodiment, the yoke has a circular shape, and the permanent magnet also uses an arc-shaped magnet. However, such an arc-shaped magnet is expensive. There is a problem that a special jig is required for positioning and the manufacturing process is complicated.

直方体、すなわち平板状の永久磁石が使用可能な上、それらの永久磁石の位置決めおよび組み付けが容易なヨークの改良例として、図１５に示すように、外筒部３０２の断面形状が略正方ヨーク３００がある。 A rectangular parallelepiped, that is, a flat permanent magnet can be used, and as an improved example of a yoke that can easily position and assemble the permanent magnet, as shown in FIG. There is.

図１５に示すように、外筒部３０２の内周面には、４つの磁石取付面３０３が設けられており、それぞれ容易に製造することができる略平板状の永久磁石４１を、磁石取付面３０３に磁着した状態で取り付けることができる。 As shown in FIG. 15, four magnet mounting surfaces 303 are provided on the inner peripheral surface of the outer cylindrical portion 302, and the substantially flat permanent magnet 41 that can be easily manufactured is connected to the magnet mounting surface. 303 can be attached in a magnetically attached state.

また、図１５に示すように、外筒部３０２の４つの角部には、いずれも内側に向かって窪んだ凹陥部３０４が形成されている。一つの磁石取付面３０３の両側にある２つの凹陥部３０４の内表面同士の距離が、略平板状の永久磁石４１の幅とほぼ等しいため、凹陥部３０４の内表面は略平板状の永久磁石４１の側面に当接することによって、略平板状の永久磁石４１の位置決めを容易に行うことができる。 Further, as shown in FIG. 15, concave portions 304 that are recessed inward are formed at the four corners of the outer cylindrical portion 302. Since the distance between the inner surfaces of the two recessed portions 304 on both sides of one magnet mounting surface 303 is substantially equal to the width of the substantially flat plate-like permanent magnet 41, the inner surface of the recessed portion 304 is a substantially flat plate-shaped permanent magnet. By abutting on the side surface of 41, the substantially flat permanent magnet 41 can be easily positioned.

略平板状の永久磁石４１は、例えば、磁石取付面３０３に当接する側の側面をＳ極、その側面と略対向する面をＮ極となるように磁化されており、これらの略平板状の永久磁石４１が略正方形状のヨーク３０に取り付けられることによって、円形状のヨーク３００の内筒部３０１の外周面はＳ極となり、略平板の永久磁石４１から内筒部３０１に向かう磁界が形成される。 The substantially flat permanent magnet 41 is magnetized so that, for example, the side surface in contact with the magnet mounting surface 303 is an S pole and the surface substantially opposite to the side surface is an N pole. By attaching the permanent magnet 41 to the substantially square yoke 30, the outer peripheral surface of the inner cylindrical portion 301 of the circular yoke 300 becomes an S pole, and a magnetic field from the substantially flat permanent magnet 41 toward the inner cylindrical portion 301 is formed. Is done.

さらに、本改良例では、略正方形ヨーク３００の内筒部３０１も断面略正方形に形成されており、内筒部３０１および略平板状の永久磁石４１と所定間隔をおいて収納されるコイルも略正方形状に巻回されたものを使用することによって、コイルを流れる電流の向きと略正方形ヨーク３００の内部に形成される磁界の向きとが略直角になることから、十分な駆動力を得ることができる。 Further, in this improved example, the inner cylindrical portion 301 of the substantially square yoke 300 is also formed in a substantially square cross section, and the coil accommodated at a predetermined interval from the inner cylindrical portion 301 and the substantially flat permanent magnet 41 is also substantially omitted. By using a coil wound in a square shape, the direction of the current flowing through the coil and the direction of the magnetic field formed inside the substantially square yoke 300 are substantially perpendicular, so that a sufficient driving force can be obtained. Can do.

このような略正方形状のヨーク３００を使用する場合、図１７に示すように、４つの角部の外縁には、いずれも内側に向かって窪んだ凹陥部が形成されている略四角形リング状の磁性部材５１を使用する。凹陥部以外の部分の幅は、略平板状の永久磁石４１の厚さと等しくなっている。 When such a substantially square-shaped yoke 300 is used, as shown in FIG. 17, each of the outer edges of the four corners has a substantially rectangular ring shape in which concave portions that are recessed inward are formed. A magnetic member 51 is used. The width of the portion other than the recessed portion is equal to the thickness of the substantially flat permanent magnet 41.

また、平板状の永久磁石が使用可能な上に、それらの磁石の位置決めおよび組み付けが容易なヨークの改良例として、図１６に示すように、外筒部３１２の断面形状が六角形のヨーク３１０がある。 Further, as an improved example of a yoke in which a flat permanent magnet can be used and the magnets can be easily positioned and assembled, as shown in FIG. 16, a yoke 310 having a hexagonal cross section as shown in FIG. There is.

図１６に示すように、ヨーク３１０の外筒部３１２には、６つの磁石取付面３１３が設けられており、それぞれ容易に製造することができる、略平板状の永久磁石４２を磁石取付面３１３に磁着した状態で取り付けることができる。 As shown in FIG. 16, the outer cylindrical portion 312 of the yoke 310 is provided with six magnet mounting surfaces 313, and the substantially flat permanent magnet 42 that can be easily manufactured, is provided with the magnet mounting surface 313. It can be attached in a magnetically attached state.

また、図１６に示すように、磁石取付面３１３に取り付けられた６つの略平板状の永久磁石４２は、隣合う略平板状の永久磁石４２同士の一部が当接した状態となるように、磁石取付面３１３を設けることによって、容易に位置決めすることができる。 In addition, as shown in FIG. 16, the six substantially flat permanent magnets 42 attached to the magnet attachment surface 313 are in a state in which a part of the adjacent substantially flat permanent magnets 42 is in contact with each other. By providing the magnet attachment surface 313, positioning can be easily performed.

略平板状の永久磁石４２は、例えば、磁石取付面３１３に当接する側の側面をＳ極、その側面と略対向する面をＮ極となるように磁化されており、これらの略平板状の永久磁石４２が略六角形状のヨーク３１０に取り付けられることによって、六角形状のヨーク３１０の内筒部３１１の外周面はＳ極となり、略平板の永久磁石４２から内筒部３１１に向かう磁界が形成される。 The substantially flat permanent magnet 42 is magnetized so that, for example, the side surface in contact with the magnet mounting surface 313 is an S pole and the surface substantially opposite to the side surface is an N pole. When the permanent magnet 42 is attached to the substantially hexagonal yoke 310, the outer peripheral surface of the inner cylindrical portion 311 of the hexagonal yoke 310 becomes an S pole, and a magnetic field from the substantially flat permanent magnet 42 toward the inner cylindrical portion 311 is formed. Is done.

さらに、本改良例では、略正方形ヨーク３１０の内筒部３１１は略断面円形に形成されており、内筒部３０１および略平板状の永久磁石４１と所定間隔をおいて収納されるコイルも略円形に巻回されたものを使用することができる。略平板状の永久磁石が円形に近い略六角形状に取り付けられるため、略円形のコイルを使用しても、十分な駆動力を得ることができる。 Further, in this improved example, the inner cylinder portion 311 of the substantially square yoke 310 is formed in a substantially circular cross section, and the coil accommodated at a predetermined interval from the inner cylinder portion 301 and the substantially flat permanent magnet 41 is also substantially omitted. What was wound by the circle can be used. Since the substantially flat permanent magnet is attached in a substantially hexagonal shape close to a circle, a sufficient driving force can be obtained even if a substantially circular coil is used.

このような略六角形状のヨークを使用する場合には、前述した磁性部材として六角形リング状の磁性部材を使用する。六角リング形状の磁性部材の幅は、略平板状の永久磁石４２の厚さと等しくなっている。
以下、ヨークの別の変形例について説明する。 When such a substantially hexagonal yoke is used, a hexagonal ring-shaped magnetic member is used as the magnetic member described above. The width of the hexagonal ring-shaped magnetic member is equal to the thickness of the substantially flat permanent magnet 42.
Hereinafter, another modified example of the yoke will be described.

図４に示すような円形状のヨーク３０では、外筒部３２の下側端面で当接しているため、下側板バネ６０Ｌの外環部６２に当接する面積が小さく、十分な接着強度がえられないため衝撃に弱いという問題がある。 Since the circular yoke 30 as shown in FIG. 4 is in contact with the lower end surface of the outer cylindrical portion 32, the area of contact with the outer ring portion 62 of the lower leaf spring 60L is small, and sufficient adhesive strength is obtained. There is a problem that it is vulnerable to shocks.

ヨークの変形例として、図１８に示すような、下側板バネの外環部６２との接着面を有する接着面付きヨーク３２０がある。 As a modified example of the yoke, there is a yoke 320 with an adhesive surface having an adhesive surface with the outer ring portion 62 of the lower leaf spring as shown in FIG.

下側板バネの外環部６２との接着面は、接着面付きヨーク３２０の外筒部３２２の端面と連続面をなした状態で、外側に延出するように形成されたタブ状部３２５から構成されている。そのため一体成形による製造が容易に行うことができる。 A bonding surface of the lower leaf spring with the outer ring portion 62 is formed from a tab-shaped portion 325 formed so as to extend outward in a state of being continuous with the end surface of the outer cylindrical portion 322 of the yoke 320 with bonding surface. It is configured. Therefore, manufacture by integral molding can be performed easily.

タブ状部３２５の下側板バネ６０Ｌの外環部６２と当接する面は、接着面付きヨーク３２０の連結部３４の上面と略平行の関係にあり、外筒部３２２の端面に、略９０度間隔で４個設けられていることによって、円形状のヨーク３０よりの外筒部３２の下側端面より広い面積で当接するので、安定かつ確実に下側板バネ６０Ｌの外環部６２を接着することができる。 The surface of the lower leaf spring 60L of the tab-shaped portion 325 that contacts the outer ring portion 62 is substantially parallel to the upper surface of the connecting portion 34 of the yoke 320 with the adhesive surface, and is approximately 90 degrees to the end surface of the outer cylindrical portion 322. Since the four are provided at intervals, they come into contact with each other in a wider area than the lower end surface of the outer cylindrical portion 32 from the circular yoke 30, so that the outer ring portion 62 of the lower leaf spring 60L is bonded stably and securely. be able to.

さらに、タブ状部３２５の外縁は略直線状となっており、タブの幅方向中心部で外筒部３２２のなす円弧との接点３２６を有し、その接点３２６における外筒部３２２のなす円弧の接線とタブ状部３２５の外縁はほぼ一致している。したがって、円形状のヨーク３０の直径方向の幅と、接着面付きヨーク３２０の相対向するタブ状部３２５の接点３２６を結んだ幅が一致し、円形状のヨーク３０を用いた場合と比較して、外形寸法が変化することなく、下側板バネ６０Ｌの外環部６２との接着面を増やすことができる。 Further, the outer edge of the tab-shaped portion 325 is substantially linear, and has a contact point 326 with the arc formed by the outer tube portion 322 at the center in the width direction of the tab, and the arc formed by the outer tube portion 322 at the contact point 326. And the outer edge of the tab-like portion 325 substantially coincide with each other. Therefore, the width in the diameter direction of the circular yoke 30 and the width connecting the contact points 326 of the tab-like portions 325 of the yoke 320 with the adhesive surface coincide with each other, compared with the case where the circular yoke 30 is used. Thus, the adhesive surface of the lower leaf spring 60L with the outer ring portion 62 can be increased without changing the external dimensions.

さらに、４つのタブ状部３２５は隣接するタブ状部との間に凹部３２７を設けることによって、組立の際、凹部３２７に前述したカバー８０の柱部８２もしくはベース８５の柱部８７が配置され、接着面付きヨーク３２０を位置決めすることができる。 Further, the four tab-like portions 325 are provided with the recesses 327 between the adjacent tab-like portions, so that the column portion 82 of the cover 80 or the column portion 87 of the base 85 described above is disposed in the recess portion 327 during assembly. The yoke 320 with the adhesive surface can be positioned.

また、図１９に示すような、外筒部３３２の端面の外周囲にわたって端面と連続面をなした状態で、外側に延出するように形成されたフランジ部３３５を有する変形接着面付きヨーク３３０もある。この変形接着面付きヨーク３３０も、円形状のヨーク３０より安定かつ確実に下側板バネ６０Ｌの外環部６２を接着できるとともに、容易に製造することができる。 Further, as shown in FIG. 19, the yoke 330 with a deformable adhesive surface having a flange portion 335 formed so as to extend outward in a state of being continuous with the end surface over the outer periphery of the end surface of the outer cylinder portion 332. There is also. This yoke 330 with a deformable adhesion surface can also adhere to the outer ring portion 62 of the lower leaf spring 60L more stably and more reliably than the circular yoke 30 and can be easily manufactured.

本発明に係るオートフォーカス用アクチュエータの実施形態の全体構成の斜視図である。1 is a perspective view of an overall configuration of an embodiment of an autofocus actuator according to the present invention. 図１に示すオートフォーカス用アクチュエータの分解斜視図である。FIG. 2 is an exploded perspective view of the autofocus actuator shown in FIG. 1. 図１に示すオートフォーカス用アクチュエータの断面概略図である。FIG. 2 is a schematic cross-sectional view of the autofocus actuator shown in FIG. 1. 円形ヨークを示す斜視図である。It is a perspective view which shows a circular yoke. ヨークの断面図であって、永久磁石のみを取り付けた場合の磁界の様子を示す。It is sectional drawing of a yoke, Comprising: The mode of a magnetic field at the time of attaching only a permanent magnet is shown. ヨークの断面図であって、永久磁石および磁性材料を取り付けた場合の磁界の様子を示す。It is sectional drawing of a yoke, Comprising: The mode of the magnetic field at the time of attaching a permanent magnet and a magnetic material is shown. 円形リング状の磁性部材を示す斜視図である。It is a perspective view which shows a circular ring-shaped magnetic member. 板バネの平面図である。It is a top view of a leaf | plate spring. シート状電極の平面図である。It is a top view of a sheet-like electrode. オートフォーカス用アクチュエータの断面概略図の一部であって、コイルの引き出し部をシート状電極に接続した状態を示す。It is a part of schematic sectional drawing of the actuator for autofocus, Comprising: The state which connected the drawer | drawing-out part of the coil to the sheet-like electrode is shown. 図１０におけるＡの部分拡大図である。It is the elements on larger scale of A in FIG. ホルダのフランジ部と、コイルの引き出し部と、シート状電極の位置関係を示す平面図である。It is a top view which shows the positional relationship of the flange part of a holder, the drawer part of a coil, and a sheet-like electrode. ストッパの平面図である。It is a top view of a stopper. カバーの開口部とストッパの位置関係を示す平面図である。It is a top view which shows the positional relationship of the opening part of a cover, and a stopper. 略正方形ヨークの斜視図であって、略平板状の永久磁石を取り付けた状態を示す。It is a perspective view of a substantially square yoke, and shows a state where a substantially flat permanent magnet is attached. 略六角形ヨークの斜視図であって、略平板状の永久磁石を取り付けた状態を示す。It is a perspective view of a substantially hexagonal yoke, and shows a state where a substantially flat permanent magnet is attached. 略正方形リング状の磁性部材を示す斜視図である。It is a perspective view which shows a substantially square ring-shaped magnetic member. タブ付きヨークの斜視図である。It is a perspective view of a yoke with a tab. タブ付きヨーク変形例の斜視図である。It is a perspective view of the yoke modification with a tab.

Explanation of symbols

１オートフォーカス用アクチュエータ
１０ホルダ
１１筒状部
１２フランジ部
１２ａ段部
１３突起
１４凹部
１５凸部（段部）
１６段部
２０コイル
２１引き出し部
２２はんだ付け部
２３ダミーワイヤー
２４応力緩和剤
３０ヨーク
３１内筒部
３２外筒部
３３磁石取付面
３４連結部
３５挿通孔
４０円弧状に湾曲した永久磁石
４１平板状の永久磁石（略正方形状のヨーク用）
４２平板状の永久磁石（略六角形状のヨーク用）
５０円形リング状の磁性部材
５１略四角形リング状の磁性部材
６０板バネ
６０Ｕ上側板バネ
６０Ｌ下側板バネ
６１内環部
６２外環部
６３連結部
６５内環部外縁の凹部
６６内環部内縁の凹部
７０ストッパ
７１開口
７２略三角形状の凹部
８０カバー
８０ａ開口部
８１上板部
８２柱部
８５ベース
８５ａ開口部
８６底板部
８６ａ開口
８７柱部
８８挿通孔
８９突起
９０シート状電極
９１リング状部
９２延出部
９３端子部
９４カバーフィルム
９５ダミー端子部
１００レンズ組立体
２００開口部
２０１略三角形状の凸部
２０２突出部
３００略正方形状のヨーク
３０１内筒部
３０２外筒部
３０３磁石取付面
３０４凹陥部
３１０略六角形状のヨーク
３１１内筒部
３１２外筒部
３１３磁石取付面
３２０接着面付ヨーク
３２２外筒部
３２５タブ状部
３２６接点
３２７凹部
３３０変形接着面付ヨーク
３３２外筒部
３３５フランジ部 DESCRIPTION OF SYMBOLS 1 Autofocus actuator 10 Holder 11 Cylindrical part 12 Flange part 12a Step part 13 Protrusion 14 Concave part 15 Convex part (Step part)
16 step portion 20 coil 21 lead portion 22 soldering portion 23 dummy wire 24 stress relieving agent 30 yoke 31 inner cylinder portion 32 outer cylinder portion 33 magnet mounting surface 34 connecting portion 35 insertion hole 40 permanent magnet 41 curved in an arc shape 41 flat plate shape Permanent magnet (for nearly square yoke)
42 Flat permanent magnets (for nearly hexagonal yokes)
50 circular ring-shaped magnetic member 51 substantially square ring-shaped magnetic member 60 leaf spring 60U upper leaf spring 60L lower leaf spring 61 inner ring portion 62 outer ring portion 63 connecting portion 65 concave portion of inner ring portion outer edge 66 inner ring portion inner edge Concave part 70 Stopper 71 Opening 72 Substantially triangular concave part 80 Cover 80a Opening part 81 Upper plate part 82 Column part 85 Base 85a Opening part 86 Bottom plate part 86a Opening 87 Column part 88 Insertion hole 89 Projection 90 Sheet electrode 91 Ring-shaped part 92 Extension part 93 Terminal part 94 Cover film 95 Dummy terminal part 100 Lens assembly 200 Opening part 201 Substantially triangular convex part 202 Projecting part 300 Substantially square yoke 301 Inner cylinder part 302 Outer cylinder part 303 Magnet mounting surface 304 Concave Part 310 substantially hexagonal yoke 311 inner cylinder part 312 outer cylinder part 313 magnet mounting surface 320 with adhesive surface Yoke 322 Outer cylinder part 325 Tab-like part 326 Contact point 327 Concave part 330 Deformable bonding surface provided yoke 332 Outer cylinder part 335 Flange part

Claims

A holder having a cylindrical portion with a lens attached to one end and a flange portion provided on the outer periphery of the other end of the cylindrical portion;
A coil fixed to the flange portion of the holder so as to be positioned around the cylindrical portion;
An inner cylinder part forming an insertion hole through which the cylindrical part of the holder is inserted, an outer cylinder part provided at a predetermined interval on the outer side of the inner cylinder part, the inner cylinder part and the outer cylinder part being attached to the holder a flange portion and a connecting portion for connecting together the opposite side, and configured yoke to accommodate the coils in the space of the predetermined intervals,
A permanent magnet arranged to face the magnet mounting surface on the inner peripheral surface of the outer cylindrical portion of the yoke at a distance from the coil;
A pair of upper and lower leaf springs provided on both sides in the optical axis direction of the cylindrical portion of the holder, and supported so as to be displaceable in the optical axis direction with the holder positioned in the radial direction;
Provided in each of the outside of the upper and lower plate springs, with respectively sandwiched between the optical axis direction both sides of the said vertical plate spring yokes, each opening in a portion corresponding to a lens mounted at least on the holder A pair of upper and lower support frames, and an autofocus actuator that adjusts the position of the lens attached to the holder in the optical axis direction by energizing the coil,
Each leaf spring includes an inner ring portion bonded to the holder, an outer ring portion provided at a predetermined interval from the inner ring portion, and bonded to the yoke, and the inner ring portion and the outer ring portion. A plurality of connecting portions that connect the optical axis in a state where the holder is positioned in a radial direction by elastically deforming the connecting portions when a load is applied to the inner ring portion. Configured to support displacement in the direction,
The yoke has a bonding surface to which the outer ring portion of the lower leaf spring is bonded, and the bonding surface forms a continuous surface with an end surface of the outer tube portion opposite to the connecting portion. It is composed of a tab-shaped part formed so as to extend outward,
On the opposite side of the holder of the lower plate spring, provided with a terminal portion for supplying electric power to said coil on the outer ring portion which is not displaced together with the inner ring portion of the lower plate spring in an insulated state with the lower plate spring, A protrusion is provided on the lower plate spring side end surface of the flange portion of the holder, and the lead portions on both sides of the coil winding are wound around the protrusion, and a slack capable of absorbing the displacement of the holder is provided. An autofocus actuator, wherein an end portion of the drawer portion is connected to the terminal portion.

The terminal portion autofocus actuator according to claim 1, characterized in that provided in the sheet-like electrode that is disposed between the lower plate spring and the lower support frame.

The stress relaxation agent is applied to at least one of a portion of the coil winding wound around the protrusion of the holder and a connection portion between the terminal portion of the sheet-like electrode. Item 3. The autofocus actuator according to Item 2.

At least three or more projections are provided on the lower plate spring side end surface of the flange portion of the holder at substantially equal intervals, and the coil lead-out portion is wound around two of the projections, and the balance projection is held on the remaining projection The autofocus actuator according to any one of claims 1 to 3, wherein the actuator is provided.

5. The autofocus actuator according to claim 4, wherein the balance holding means is a dummy wire using the same wire as the coil winding.

6. The autofocus actuator according to claim 5, wherein the dummy wire has one end wound around the protrusion and the other end connected to the sheet-like electrode, similarly to the coil winding lead portion.