JP6164901B2 - Leaf spring for lens driving device - Google Patents

Leaf spring for lens driving device Download PDF

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JP6164901B2
JP6164901B2 JP2013080065A JP2013080065A JP6164901B2 JP 6164901 B2 JP6164901 B2 JP 6164901B2 JP 2013080065 A JP2013080065 A JP 2013080065A JP 2013080065 A JP2013080065 A JP 2013080065A JP 6164901 B2 JP6164901 B2 JP 6164901B2
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spring
leaf spring
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pieces
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泰宏 澤本
泰宏 澤本
浩介 武冨
浩介 武冨
篤人 堀野
篤人 堀野
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Molex LLC
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Description

本発明は、ＡＦ（オートフォーカス）カメラモジュール等に設けられるレンズ駆動装置用板バネに関する。   The present invention relates to a leaf spring for a lens driving device provided in an AF (autofocus) camera module or the like.

カメラ付き携帯電話機等に搭載されるＡＦカメラモジュールには、レンズを光軸方向に変位駆動させるレンズ駆動装置が設けられている。このようなレンズ駆動装置は、レンズをレンズ光軸方向に移動可能に支持する板バネを有しており、板バネは、固定部材に固定される環状のフレーム部と、フレーム部から内周側に延出し、フレーム部の中央部に配置されるレンズをフレーム部の中心軸方向（レンズ光軸方向）に変位可能に支持するバネ部とを備える（例えば、特許文献１参照）。   An AF camera module mounted on a camera-equipped cellular phone or the like is provided with a lens driving device that drives the lens to move in the optical axis direction. Such a lens driving device includes a leaf spring that supports the lens so as to be movable in the lens optical axis direction. The leaf spring includes an annular frame portion fixed to a fixing member, and an inner peripheral side from the frame portion. And a spring portion that supports the lens disposed at the center of the frame portion so as to be displaceable in the central axis direction (lens optical axis direction) of the frame portion (see, for example, Patent Document 1).

一般に、この種の板バネは、エッチング工法（化学反応切削加工）またはプレス工法（塑性加工）により製造されている。エッチング工法では、最終形状と同様のマスクを用いて、マスク以外の部分を化学反応切削するが、化学反応切削では、マスク部が切削されないという保証がないだけでなく、製造に時間がかかり、コストが上昇するという問題がある。   In general, this type of leaf spring is manufactured by an etching method (chemical reaction cutting) or a pressing method (plastic processing). The etching method uses the same mask as the final shape to cut parts other than the mask by chemical reaction, but chemical reaction cutting not only guarantees that the mask part will not be cut, but also takes time to manufacture and costs. There is a problem of rising.

特開２０１１−１６９４４６号公報JP 2011-169446 A

一方、プレス工法では、エッチング工法に比べて板バネの製造時間を短縮することが可能であるが、プレス工法により製造される板バネの寸法精度は、加工パーツの寸法精度に依存するため、要求される寸法精度を達成することが困難な場合がある。例えば、プレス工法で一枚の板バネに同一形状のバネ部をＮ本加工する場合、加工パーツにはＮ本分のバネ部加工箇所が必要となるが、これらのバネ部加工箇所が同寸法で製作されるという保証がないので、すべてのバネ部の形状が一定にならず、バネ部の性能にばらつきが生じる惧れがあった。   On the other hand, in the press method, it is possible to shorten the manufacturing time of the leaf spring compared to the etching method, but the dimensional accuracy of the leaf spring manufactured by the press method depends on the dimensional accuracy of the processed part, so it is required. It may be difficult to achieve the desired dimensional accuracy. For example, when N pieces of spring parts with the same shape are machined on a single leaf spring by the press method, N parts of the spring parts are required for the machined parts. Since there is no guarantee that it will be manufactured, the shape of all the spring parts is not constant, and the performance of the spring parts may vary.

そこで、本発明は、上記の問題点に鑑みなされたものであって、エッチング工法に比べて製造時間を短縮できるプレス工法で製造しても、Ｎ本のバネ部を同寸法とし、安定した性能が得られるレンズ駆動装置用板バネを提供することを目的とする。   Therefore, the present invention has been made in view of the above problems, and even when manufactured by a press method that can reduce the manufacturing time compared to the etching method, the N spring portions have the same dimensions and have stable performance. It is an object of the present invention to provide a leaf spring for a lens driving device from which the above can be obtained.

本発明は上記目的を達成するために提案されたものであり、固定部材に固定される環状のフレーム部と、前記フレーム部から内周側に延出し、前記フレーム部の中央部に配置されるレンズを前記フレーム部の中心軸方向に変位可能に支持するＮ本のバネ部を、を備えるレンズ駆動装置用板バネであって、同一形状に形成されるＮ枚の分割板バネ片を備え、
Ｎ枚の前記分割板バネ片は、それぞれ、前記フレーム部の一部を形成する分割フレーム片と、該分割フレーム片から内周側に延出する１本の前記バネ部とからなり、前記分割フレーム片は、互いに一部が重なり合う状態で周方向に並ぶことにより環状の前記フレーム部を形成するとともに、前記バネ部を延出する領域と前記バネ部を延出しない領域とを備え、その二つの領域の間に、互いに一部が重なり合ってもＮ本の前記バネ部を同一平面状に位置させるための段差部を有することを特徴とする。 The present invention has been proposed in order to achieve the above object, and includes an annular frame portion fixed to a fixing member, an inner peripheral side extending from the frame portion, and disposed at a central portion of the frame portion. A leaf spring for a lens driving device comprising N spring portions for supporting the lens so as to be displaceable in the direction of the central axis of the frame portion, comprising N divided leaf spring pieces formed in the same shape;
Each of the N divided leaf spring pieces includes a divided frame piece that forms a part of the frame portion, and one spring portion that extends from the divided frame piece toward the inner peripheral side. The frame pieces are arranged in the circumferential direction so as to partially overlap each other to form the annular frame portion, and include a region extending the spring portion and a region not extending the spring portion. Between the two regions, there is a step portion for positioning the N spring portions on the same plane even if part of them overlap each other.

また、前記分割フレーム片は、互いに重なり合う領域に位置決め孔を備え、互いに重なり合う前記分割フレーム片同士の位置決め孔に位置決め部材を貫通させることにより位置決めされることを特徴とする。   In addition, the divided frame pieces are provided with positioning holes in areas where they are overlapped with each other, and are positioned by passing a positioning member through the positioning holes of the overlapping divided frame pieces.

また、前記分割フレーム片は、異なる組み合せで３枚以上が重なり合う領域を複数備え、これらの領域にそれぞれ前記位置決め孔を備えることを特徴とする。   In addition, the divided frame piece includes a plurality of regions in which three or more sheets are overlapped in different combinations, and each of the regions includes the positioning hole.

本発明によれば、エッチング工法に比べて製造時間を短縮できるプレス工法で製造しても、Ｎ本のバネ部を同寸法とし、安定した性能が得られるレンズ駆動装置用板バネを提供することができる。   According to the present invention, there is provided a leaf spring for a lens driving device in which N spring portions have the same dimensions and stable performance can be obtained even when manufactured by a press method that can reduce the manufacturing time as compared with an etching method. Can do.

本発明の第１実施形態に係るレンズ駆動装置用板バネを示す斜視図である。It is a perspective view which shows the leaf | plate spring for lens drive devices which concerns on 1st Embodiment of this invention. 本発明の第１実施形態に係るレンズ駆動装置用板バネを示す図であり、（ａ）はレンズ駆動装置用板バネの平面図、（ｂ）はレンズ駆動装置用板バネの正面図である。It is a figure which shows the leaf | plate spring for lens drive devices which concerns on 1st Embodiment of this invention, (a) is a top view of the leaf | plate spring for lens drive devices, (b) is a front view of the leaf | plate spring for lens drive devices. . 本発明の第１実施形態に係るレンズ駆動装置用板バネを構成する分割板バネ片を示す斜視図である。It is a perspective view which shows the division | segmentation leaf | plate spring piece which comprises the leaf | plate spring for lens drive devices which concerns on 1st Embodiment of this invention. 本発明の第１実施形態に係るレンズ駆動装置用板バネを構成する分割板バネ片を示す図であり、（ａ）は分割板バネ片の平面図、（ｂ）は分割板バネ片の正面図、（ｃ）は分割板バネ片の左側面図、（ｄ）は分割板バネ片の右側面図である。It is a figure which shows the division | segmentation leaf | plate spring piece which comprises the leaf | plate spring for lens drive devices which concerns on 1st Embodiment of this invention, (a) is a top view of a division | segmentation leaf | plate spring piece, (b) is the front of a division | segmentation leaf | plate spring piece. FIG. 4C is a left side view of the split leaf spring piece, and FIG. 4D is a right side view of the split leaf spring piece. 本発明の第１実施形態に係るレンズ駆動装置用板バネを構成する分割板バネ片を示す要部拡大図であり、（ａ）は図４のＡ部拡大図、（ｂ）は図４のＢ部拡大図、（ｃ）は図４のＣ部拡大図である。It is a principal part enlarged view which shows the division | segmentation leaf | plate spring piece which comprises the leaf | plate spring for lens drive devices which concerns on 1st Embodiment of this invention, (a) is the A section enlarged view of FIG. 4, (b) is FIG. B part enlarged view and (c) are C part enlarged views of FIG. 本発明の第１実施形態に係るレンズ駆動装置用板バネの組み立て工程を示す斜視図である。It is a perspective view which shows the assembly process of the leaf | plate spring for lens drive devices which concerns on 1st Embodiment of this invention. 本発明の第１実施形態に係るレンズ駆動装置用板バネの高さ関係を示す斜視図である。It is a perspective view which shows the height relationship of the leaf | plate spring for lens drive devices which concerns on 1st Embodiment of this invention. 本発明の第２実施形態に係るレンズ駆動装置用板バネを示す斜視図である。It is a perspective view which shows the leaf | plate spring for lens drive devices which concerns on 2nd Embodiment of this invention. 本発明の第２実施形態に係るレンズ駆動装置用板バネを示す図であり、（ａ）はレンズ駆動装置用板バネの平面図、（ｂ）はレンズ駆動装置用板バネの正面図である。It is a figure which shows the leaf | plate spring for lens drive devices which concerns on 2nd Embodiment of this invention, (a) is a top view of the leaf | plate spring for lens drive devices, (b) is a front view of the leaf | plate spring for lens drive devices. . 本発明の第２実施形態に係るレンズ駆動装置用板バネを構成する分割板バネ片を示す斜視図である。It is a perspective view which shows the division | segmentation leaf | plate spring piece which comprises the leaf | plate spring for lens drive devices which concerns on 2nd Embodiment of this invention. 本発明の第２実施形態に係るレンズ駆動装置用板バネを構成する分割板バネ片を示す図であり、（ａ）は分割板バネ片の平面図、（ｂ）は分割板バネ片の正面図、（ｃ）は分割板バネ片の左側面図、（ｄ）は分割板バネ片の右側面図である。It is a figure which shows the division | segmentation leaf | plate spring piece which comprises the leaf | plate spring for lens drive devices which concerns on 2nd Embodiment of this invention, (a) is a top view of a division | segmentation leaf | plate spring piece, (b) is the front of a division | segmentation leaf | plate spring piece. FIG. 4C is a left side view of the split leaf spring piece, and FIG. 4D is a right side view of the split leaf spring piece. 本発明の第２実施形態に係るレンズ駆動装置用板バネを構成する分割板バネ片を示す要部拡大図であり、（ａ）は図１１のＤ部拡大図、（ｂ）は図１１のＥ部拡大図である。It is a principal part enlarged view which shows the division | segmentation leaf | plate spring piece which comprises the leaf | plate spring for lens drive devices which concerns on 2nd Embodiment of this invention, (a) is the D section enlarged view of FIG. 11, (b) is FIG. It is an E section enlarged view. 本発明の第２実施形態に係るレンズ駆動装置用板バネの組み立て工程を示す斜視図である。It is a perspective view which shows the assembly process of the leaf | plate spring for lens drive devices which concerns on 2nd Embodiment of this invention. 本発明の第２実施形態に係るレンズ駆動装置用板バネの高さ関係を示す斜視図である。It is a perspective view which shows the height relationship of the leaf | plate spring for lens drive devices which concerns on 2nd Embodiment of this invention.

以下、本発明に係る好適な実施形態について、図面を参照しながら詳細に説明する。なお、実施形態の説明の全体を通じて同じ要素には同じ符号を付して説明する。   DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the drawings. Note that the same reference numerals are given to the same elements throughout the description of the embodiment.

図１は、本発明の第１実施形態に係るレンズ駆動装置用板バネを示す斜視図、図２は、本発明の第１実施形態に係るレンズ駆動装置用板バネを示す図であり、（ａ）はレンズ駆動装置用板バネの平面図、（ｂ）はレンズ駆動装置用板バネの正面図である。   FIG. 1 is a perspective view showing a leaf spring for a lens driving device according to a first embodiment of the present invention, and FIG. 2 is a view showing a leaf spring for a lens driving device according to the first embodiment of the present invention. (a) is a plan view of a leaf spring for a lens driving device, and (b) is a front view of the leaf spring for a lens driving device.

これらの図に示すように、本発明の第１実施形態に係るレンズ駆動装置用板バネ１は、環状のフレーム部２と、フレーム部２から内周側に延出する４本のバネ部３とを備える。なお、バネ部の本数は４本に限定されず、２本以上であれば任意の本数とすることができる。   As shown in these drawings, the leaf spring 1 for a lens driving device according to the first embodiment of the present invention includes an annular frame portion 2 and four spring portions 3 extending from the frame portion 2 toward the inner peripheral side. With. Note that the number of spring portions is not limited to four, and can be any number as long as it is two or more.

フレーム部２は、平板状の略方形の形状をしており、レンズ駆動装置の固定部材（図示せず）に固定される。例えば、本実施形態のフレーム部２は、周方向の角部に所定の間隔を存して並ぶ４つの固定孔２ａを備えており、これらの固定孔２ａに貫通されるピンなどの固定部材（図示せず）を介して、レンズ駆動装置の固定部材に固定される。   The frame part 2 has a flat, substantially rectangular shape, and is fixed to a fixing member (not shown) of the lens driving device. For example, the frame portion 2 of the present embodiment includes four fixing holes 2a arranged at predetermined intervals at corners in the circumferential direction, and a fixing member such as a pin that penetrates the fixing holes 2a ( It is fixed to a fixing member of the lens driving device via a not-shown).

バネ部３は、フレーム部２の中央部に配置されるレンズ（図示せず）をフレーム部２の中心軸方向Ｚ（レンズ光軸方向）に変位可能に支持する。例えば、本実施形態のバネ部３は、フレーム部２の内周側に沿う円弧形状の第１腕部３ａと、第１腕部３ａの端部から第１腕部３ａが沿う方向と反対方向の内周側に沿って折返し状に形成される円弧形状の第２腕部３ｂとを備え、第２腕部３ｂで保持したレンズを、主に第１腕部３ａの弾性変形によりレンズ光軸方向に変位させる。なお、本実施形態のバネ部３は、隣接するバネ部３と一部が重なり合い、図２（ａ）に示されるように、切れ目のない連続した略環状の形状を備えるものとして説明するが、バネ部３同士が重ならない形状としてもよい。   The spring portion 3 supports a lens (not shown) disposed at the center portion of the frame portion 2 so as to be displaceable in the central axis direction Z (lens optical axis direction) of the frame portion 2. For example, the spring portion 3 according to the present embodiment includes an arc-shaped first arm portion 3a along the inner peripheral side of the frame portion 2, and a direction opposite to the direction along which the first arm portion 3a extends from the end of the first arm portion 3a. The second arm portion 3b having an arc shape formed in a folded shape along the inner peripheral side of the lens, and the lens held by the second arm portion 3b is used as a lens optical axis mainly by elastic deformation of the first arm portion 3a. Displace in the direction. In addition, although the spring part 3 of this embodiment overlaps with the adjacent spring part 3, and demonstrates as shown in FIG.2 (a) as what is provided with the continuous substantially cyclic | annular shape without a cut | interruption, It is good also as a shape where the spring parts 3 do not overlap.

図３は、本発明の第１実施形態に係るレンズ駆動装置用板バネを構成する分割板バネ片を示す斜視図、図４は、本発明の第１実施形態に係るレンズ駆動装置用板バネを構成する分割板バネ片を示す図であり、（ａ）は分割板バネ片の平面図、（ｂ）は分割板バネ片の正面図、（ｃ）は分割板バネ片の左側面図、（ｄ）は分割板バネ片の右側面図、図５は、本発明の第１実施形態に係るレンズ駆動装置用板バネを構成する分割板バネ片を示す要部拡大図であり、（ａ）は図４のＡ部拡大図、（ｂ）は図４のＢ部拡大図、（ｃ）は図４のＣ部拡大図である。
これらの図に示すように、レンズ駆動装置用板バネ１は、プレス工法により同一形状に形成される４枚の分割板バネ片１１を備え、これらの分割板バネ片１１を組み合せることにより構成される。このようなレンズ駆動装置用板バネ１によれば、エッチング工法に比べて製造時間を短縮できるプレス工法で製造されるものでありながら、４本のバネ部３を同寸法とし、安定した性能が得られる。具体的には、プレス工法では、同一の金型を用いて分割板バネ片用の金属板を打ち抜くことによって分割板バネ片１１が形成されるため、同寸法のバネ部３を備えるＮ本の分割板バネ片１１を作製することができる。以下、分割板バネ片１１の具体的な形状について説明する。 FIG. 3 is a perspective view showing a divided leaf spring piece constituting the leaf spring for the lens driving device according to the first embodiment of the present invention, and FIG. 4 is a leaf spring for the lens driving device according to the first embodiment of the present invention. (A) is a plan view of the split leaf spring piece, (b) is a front view of the split leaf spring piece, (c) is a left side view of the split leaf spring piece, (D) is a right side view of the split leaf spring piece, and FIG. 5 is an enlarged view of a main part showing the split leaf spring piece constituting the leaf spring for the lens driving device according to the first embodiment of the present invention. ) Is an enlarged view of part A in FIG. 4, (b) is an enlarged view of part B in FIG. 4, and (c) is an enlarged view of part C in FIG.
As shown in these drawings, the leaf spring 1 for a lens driving device includes four divided leaf spring pieces 11 formed in the same shape by a press method, and is configured by combining these divided leaf spring pieces 11. Is done. According to such a leaf spring 1 for a lens driving device, although it is manufactured by a press method that can reduce the manufacturing time as compared with an etching method, the four spring portions 3 have the same dimensions and have stable performance. can get. Specifically, in the press method, since the split leaf spring pieces 11 are formed by punching out a metal plate for the split leaf spring pieces using the same mold, N pieces of spring portions 3 having the same dimensions are formed. The divided leaf spring piece 11 can be produced. Hereinafter, a specific shape of the divided leaf spring piece 11 will be described.

４枚の分割板バネ片１１は、それぞれ、フレーム部２の一部を形成する分割フレーム片１２と、該分割フレーム片１２から内周側に延出するバネ片１３とからなる。バネ片１３は、バネ部３と同一形状であり、そのままバネ部３を構成する。一方、分割フレーム片１２は、互いに一部が重なり合う状態で周方向に並ぶことにより環状のフレーム部２を形成する。   Each of the four divided leaf spring pieces 11 includes a divided frame piece 12 that forms a part of the frame portion 2 and a spring piece 13 that extends from the divided frame piece 12 to the inner peripheral side. The spring piece 13 has the same shape as the spring part 3 and constitutes the spring part 3 as it is. On the other hand, the divided frame pieces 12 form an annular frame portion 2 by being arranged in the circumferential direction in a state where a part thereof overlaps each other.

本実施形態の分割フレーム片１２は、平面視でＬ字形状を有しており、フレーム部２の中心点Ｏを中心として９０゜ずつ回転させ、順次隣接する分割フレーム片１２に重ね合わせることによりフレーム部２を形成することができる。これにより、各分割フレーム片１２では、異なる組み合せで互いに重なり合う第１〜第３の領域１２ａ、１２ｂ、１２ｃが生じる。例えば、３枚が重なり合う状態で、中間層となる領域を第１領域１２ａ、上層となる領域を第２領域１２ｂ、下層となる領域を第３領域１２ｃとする。なお、図面においては、各領域１２ａ〜１２ｃを明確にするためにハッチングを付与する。   The divided frame piece 12 of the present embodiment has an L shape in plan view, and is rotated by 90 ° about the center point O of the frame portion 2 and sequentially overlaps the adjacent divided frame pieces 12. The frame part 2 can be formed. Thereby, in each divided frame piece 12, the 1st-the 3rd field 12a, 12b, and 12c which mutually overlap with a different combination arise. For example, in a state where three sheets are overlapped, a region serving as an intermediate layer is referred to as a first region 12a, a region serving as an upper layer is referred to as a second region 12b, and a region serving as a lower layer is referred to as a third region 12c. In the drawing, hatching is given to clarify each of the regions 12a to 12c.

４枚の分割板バネ片１１が備える分割フレーム片１２は、互いに一部が重なり合う状態で周方向に並んで環状のフレーム部２を形成した場合、分割フレーム片１２同士が重なりによって相対的に傾斜し、または、高低差を生じさせ、４本のバネ部３間に位置誤差が生じる惧れがある。そこで、本発明の分割フレーム片１２には、互いに一部が重なり合っても４本のバネ部３を同一平面上に位置させるための段差部１２ｄ、１２ｅが形成される。   The divided frame pieces 12 included in the four divided leaf spring pieces 11 are relatively inclined due to the overlapping of the divided frame pieces 12 when the annular frame portions 2 are formed side by side in the circumferential direction so as to partially overlap each other. Alternatively, a height difference may be caused, and a position error may occur between the four spring portions 3. Therefore, the divided frame pieces 12 of the present invention are formed with stepped portions 12d and 12e for positioning the four spring portions 3 on the same plane even if they partially overlap each other.

重ね合わせ時に中間層となる第１領域１２ａからバネ部３を延出させる場合、中間層となる第１領域１２ａと上層となる第２領域１２ｂとの間に、立上がり状の第１段差部１２ｄを設けるとともに、中間層となる第１領域１２ａと下層となる第３領域１２ｃとの間に、立下がり状の第２段差部１２ｅを設ける。このようにすると、分割フレーム片１２同士を相対的に傾斜させることなく重ね合わせることが可能になるので、４本のバネ部３を同一平面上（中間層）に位置させることができる。また、本実施形態では、バネ片１３同士も一部が重なり合うので、バネ部３の第１腕部３ａの端部には、第５領域１３ｂを備え、中間層となる第４領域１３ａと上層となる第５領域１３ｂとの間に、立上がり状の第３段差部１３ｃが設けられる。さらに、第３段差部１３ｃによって、第５領域１３ｂは、第２領域１２ｂと同一平面状に位置させることができる。なお、４本のバネ部３を同一平面上により精度よく位置させるためには、左記の立ち上がり状の段差部１２ｄ、１３ｄや立ち下がり状の段差部１２ｅの高さ方向の寸法は、バネ片の板厚と同程度の寸法が望ましい。   When the spring portion 3 is extended from the first region 12a serving as the intermediate layer at the time of overlapping, the first step portion 12d having a rising shape is formed between the first region 12a serving as the intermediate layer and the second region 12b serving as the upper layer. And a second stepped portion 12e having a falling shape is provided between the first region 12a serving as an intermediate layer and the third region 12c serving as a lower layer. In this way, the divided frame pieces 12 can be overlapped without being relatively inclined, so that the four spring portions 3 can be positioned on the same plane (intermediate layer). Moreover, in this embodiment, since the spring pieces 13 also partially overlap each other, the end portion of the first arm portion 3a of the spring portion 3 includes the fifth region 13b, and the fourth region 13a serving as an intermediate layer and the upper layer A rising third step 13c is provided between the fifth region 13b. Further, the fifth step 13c allows the fifth region 13b to be positioned in the same plane as the second region 12b. In order to position the four spring portions 3 more precisely on the same plane, the height-wise stepped portions 12d and 13d and the falling stepped portion 12e shown in the left are dimensioned in the height direction of the spring piece. A size comparable to the plate thickness is desirable.

また、分割フレーム片１２は、互いに重なり合う領域１２ａ〜１２ｃに加え、位置決め孔１２ｆ〜１２ｈを備えており、互いに重なり合う分割フレーム片１２同士の位置決め孔１２ｆ〜１２ｈにピンなどの位置決め部材（図示せず）を貫通させることにより位置決めされる。本実施形態の分割フレーム片１２は、異なる組み合せで３枚が重なり合う領域１２ａ〜１２ｃを３つ備え、これらの領域１２ａ〜１２ｃにそれぞれ位置決め孔１２ｆ〜１２ｈを備える。この構成によれば、４枚の分割板バネ片１１を組み合わせて構成されるものでありながら、各分割板バネ片１１を精度良く位置決めすることができる。なお、本実施形態では、位置決め孔１２ｆを固定孔２ａに兼用するが、位置決め孔１２ｆと固定孔２ａは別々に形成されるものであってもよい。
なお、段差部１２ｄ，１２ｅ，１３ｄと位置決め孔１２ｆ〜１２ｈは、分割板バネ片１１とともに、プレス工法によって形成される。 The divided frame pieces 12 include positioning holes 12f to 12h in addition to the overlapping areas 12a to 12c, and positioning members (not shown) such as pins are provided in the positioning holes 12f to 12h of the divided frame pieces 12 that overlap each other. ). The divided frame piece 12 according to the present embodiment includes three regions 12a to 12c in which three pieces overlap each other in different combinations, and the regions 12a to 12c include positioning holes 12f to 12h, respectively. According to this configuration, each of the divided leaf spring pieces 11 can be accurately positioned while being configured by combining the four divided leaf spring pieces 11. In this embodiment, the positioning hole 12f is also used as the fixing hole 2a. However, the positioning hole 12f and the fixing hole 2a may be formed separately.
The step portions 12d, 12e, 13d and the positioning holes 12f to 12h are formed together with the divided leaf spring pieces 11 by a press method.

つぎに、本発明の第１実施形態に係るレンズ駆動装置用板バネ１の組み立て工程および段差部１２ｄ、１２ｅの作用について、図６および図７を参照して説明する。   Next, an assembling process of the leaf spring 1 for a lens driving device according to the first embodiment of the present invention and an operation of the step portions 12d and 12e will be described with reference to FIGS.

図６は、本発明の第１実施形態に係るレンズ駆動装置用板バネの組み立て工程を示す斜視図、図７は、本発明の第１実施形態に係るレンズ駆動装置用板バネの高さ関係を示す斜視図である。
これらの図に示すように、本実施形態のレンズ駆動装置用板バネ１は、プレス工程により同一形状に形成された４枚の分割板バネ片１１を９０゜ずつ回転させながら順次重ね合わせることにより組み立てられる。図６は、１枚目の分割板バネ片１１に２枚目の分割板バネ片１１を上方から重ね合わせる場合を示しており、このとき１枚目の分割板バネ片１１の第１領域１２ａ（第４領域１３ａ）上に２枚目の分割板バネ片１１の第２領域１２ｂ（第５領域１３ｂ）が重なり、１枚目の分割板バネ片１１の第３領域１２ｃ上に２枚目の分割板バネ片１１の第１領域１２ａが重なるようにする。 FIG. 6 is a perspective view showing an assembly process of the leaf spring for the lens driving device according to the first embodiment of the present invention, and FIG. 7 is the height relationship of the leaf spring for the lens driving device according to the first embodiment of the present invention. FIG.
As shown in these drawings, the leaf spring 1 for the lens driving device according to the present embodiment is obtained by sequentially superimposing four divided leaf spring pieces 11 formed in the same shape by a press process while rotating each 90 °. Assembled. FIG. 6 shows a case where the second divided leaf spring piece 11 is superposed on the first divided leaf spring piece 11 from above. At this time, the first region 12a of the first divided leaf spring piece 11 is shown. The second region 12b (fifth region 13b) of the second divided leaf spring piece 11 overlaps on the (fourth region 13a), and the second piece on the third region 12c of the first divided leaf spring piece 11 overlaps. The first region 12a of the divided leaf spring piece 11 is overlapped.

このようにすると、分割板バネ片１１の各領域１２ａ〜１２ｃ（１３ａ、１３ｂ）は、各領域１２ａ〜１２ｃ（１３ａ、１３ｂ）間に形成される段差部１２ｄ、１２ｅ（１３ｃ）の作用により、相対的に傾斜したり、高低差を生じさせることなく重なり合う。これにより、各分割板バネ片１１の同じ領域１２ａ〜１２ｃ（１３ａ、１３ｂ）同士を同一平面上に位置させることができる。図７は、１枚目と２枚目の第２領域１２ｂ（第５領域１３ｂ）が同一平面上に位置することを示している。   If it does in this way, each area | region 12a-12c (13a, 13b) of the division | segmentation leaf | plate spring piece 11 will be by the effect | action of level | step-difference part 12d, 12e (13c) formed between each area | region 12a-12c (13a, 13b). They overlap without tilting or causing a height difference. Thereby, the same area | regions 12a-12c (13a, 13b) of each division | segmentation leaf | plate spring piece 11 can be located on the same plane. FIG. 7 shows that the first and second second regions 12b (fifth regions 13b) are located on the same plane.

また、３枚目、４枚目も同様に重ねていくが、３枚目を重ねるときは、３枚目の分割板バネ片１１の第３領域１２ｃが１枚目の分割板バネ片１１の第２領域１２ｂの下側に入り込むようにする。また、４枚目を重ねるときは、４枚目の分割板バネ片１１の第１領域１２ａ（第４領域１３ａ）が１枚目の分割板バネ片１１の第２領域１２ｂの下側で３枚目の分割板バネ片１１の第３領域１２ｃ上に重なり、４枚目の分割板バネ片１１の第３領域１２ｃが１枚目の分割板バネ片１１の第１領域１２ａの下側に重なるようにする。その結果、すべての分割板バネ片１１が相対的に傾斜することなく重なり合って環状のフレーム部２を形成するとともに、４本のバネ部３が同一平面上に位置するレンズ駆動装置用板バネ１が得られる。また、バネ部３の第５領域１３ｂが、隣接する他のバネ部３の第２腕部の端部に重なり合うことによって、環状を形成し、平面側を基準として位置決め精度を向上させることができる。   The third and fourth sheets are similarly stacked. When the third sheet is stacked, the third region 12c of the third divided leaf spring piece 11 is replaced by the first divided leaf spring piece 11. It enters into the lower side of the 2nd field 12b. When the fourth sheet is stacked, the first region 12a (fourth region 13a) of the fourth divided leaf spring piece 11 is 3 below the second region 12b of the first divided leaf spring piece 11. It overlaps on the third area 12c of the first divided leaf spring piece 11, and the third area 12c of the fourth divided leaf spring piece 11 is below the first area 12a of the first divided leaf spring piece 11. Make sure they overlap. As a result, all the divided leaf spring pieces 11 are overlapped without being inclined relatively to form an annular frame portion 2 and the four spring portions 3 are located on the same plane. Is obtained. Further, the fifth region 13b of the spring part 3 overlaps with the end part of the second arm part of the other adjacent spring part 3, thereby forming a ring and improving the positioning accuracy with reference to the plane side. .

つぎに、本発明の第２実施形態に係るレンズ駆動装置用板バネについて、図８〜図１４を参照して説明する。なお、第１実施形態と共通する部分については、第１実施形態と同じ符号を付与することにより、第１実施形態の説明を援用する。   Next, a leaf spring for a lens driving device according to a second embodiment of the present invention will be described with reference to FIGS. In addition, about the part which is common in 1st Embodiment, the description of 1st Embodiment is used by providing the same code | symbol as 1st Embodiment.

図８は、本発明の第２実施形態に係るレンズ駆動装置用板バネを示す斜視図、図９は、本発明の第２実施形態に係るレンズ駆動装置用板バネを示す図であり、（ａ）はレンズ駆動装置用板バネの平面図、（ｂ）はレンズ駆動装置用板バネの正面図である。
これらの図に示すように、本発明の第２実施形態に係るレンズ駆動装置用板バネ１Ｂは、第１実施形態のレンズ駆動装置用板バネ１と平面形状は略同様であるが、第１実施形態のレンズ駆動装置用板バネ１が３層構成であるのに対し、２層構成である点が相違している。 FIG. 8 is a perspective view showing a leaf spring for a lens driving device according to a second embodiment of the present invention, and FIG. 9 is a view showing a leaf spring for a lens driving device according to the second embodiment of the present invention. (a) is a plan view of a leaf spring for a lens driving device, and (b) is a front view of the leaf spring for a lens driving device.
As shown in these drawings, the leaf spring 1B for a lens driving device according to the second embodiment of the present invention has substantially the same planar shape as the leaf spring 1 for a lens driving device of the first embodiment. The lens driving device leaf spring 1 of the embodiment has a three-layer structure, but differs in that it has a two-layer structure.

図１０は、本発明の第２実施形態に係るレンズ駆動装置用板バネを構成する分割板バネ片を示す斜視図、図１１は、本発明の第２実施形態に係るレンズ駆動装置用板バネを構成する分割板バネ片を示す図であり、（ａ）は分割板バネ片の平面図、（ｂ）は分割板バネ片の正面図、（ｃ）は分割板バネ片の左側面図、（ｄ）は分割板バネ片の右側面図、図１２は、本発明の第２実施形態に係るレンズ駆動装置用板バネを構成する分割板バネ片を示す要部拡大図であり、（ａ）は図１１のＤ部拡大図、（ｂ）は図１１のＥ部拡大図である。
これらの図に示すように、第２実施形態のレンズ駆動装置用板バネ１Ｂは、第１実施形態のレンズ駆動装置用板バネ１と同様に、プレス工法により同一形状に形成される４枚の分割板バネ片１１Ｂを備え、これらの分割板バネ片１１Ｂを組み合せることにより構成されるが、分割板バネ片１１Ｂの分割フレーム片１２Ｂの形状が第１実施形態と相違している。 FIG. 10 is a perspective view showing a split leaf spring piece constituting the leaf spring for the lens driving device according to the second embodiment of the present invention, and FIG. 11 is a leaf spring for the lens driving device according to the second embodiment of the present invention. (A) is a plan view of the split leaf spring piece, (b) is a front view of the split leaf spring piece, (c) is a left side view of the split leaf spring piece, (D) is a right side view of the split leaf spring piece, and FIG. 12 is an enlarged view of a main part showing the split leaf spring piece constituting the leaf spring for the lens driving device according to the second embodiment of the present invention. ) Is an enlarged view of part D in FIG. 11, and (b) is an enlarged view of part E in FIG. 11.
As shown in these figures, the leaf spring 1B for the lens driving device according to the second embodiment is similar to the leaf spring 1 for the lens driving device according to the first embodiment. Although it comprises the division leaf | plate spring piece 11B and comprised by combining these division | segmentation leaf | plate spring pieces 11B, the shape of the division | segmentation frame piece 12B of the division | segmentation leaf | plate spring piece 11B is different from 1st Embodiment.

具体的に説明すると、第２実施形態の分割フレーム片１２Ｂは、第１実施形態の分割フレーム片１２の第３領域１２ｃを省いた形状であるが、第１実施形態と同様に、フレーム部２の中心点Ｏを中心として９０゜ずつ回転させ、順次隣接する分割フレーム片１２に重ね合わせることによりフレーム部２を形成することができる。ただし、第２実施形態の各分割フレーム片１２Ｂでは、第３領域１２ｃが省かれているので、重なり合う状態で、第１領域１２ａが下層、第２領域１２ｂが上層となる。   More specifically, the divided frame piece 12B of the second embodiment has a shape in which the third region 12c of the divided frame piece 12 of the first embodiment is omitted, but the frame portion 2 is the same as the first embodiment. The frame portion 2 can be formed by rotating by 90 ° around the center point O and sequentially overlapping the adjacent divided frame pieces 12. However, in each divided frame piece 12B of the second embodiment, since the third region 12c is omitted, the first region 12a is the lower layer and the second region 12b is the upper layer in an overlapping state.

つぎに、本発明の第２実施形態に係るレンズ駆動装置用板バネ１Ｂの組み立て工程について、図１３および図１４を参照して説明する。   Next, an assembly process of the leaf spring 1B for a lens driving device according to the second embodiment of the present invention will be described with reference to FIGS.

図１３は、本発明の第２実施形態に係るレンズ駆動装置用板バネの組み立て工程を示す斜視図、図１４は、本発明の第２実施形態に係るレンズ駆動装置用板バネの高さ関係を示す斜視図である。
これらの図に示すように、第２実施形態のレンズ駆動装置用板バネ１Ｂは、プレス工程により同一形状に形成された４枚の分割板バネ片１１Ｂを９０゜ずつ回転させながら順次重ね合わせることにより組み立てられる。図１３は、１枚目の分割板バネ片１１Ｂに２枚目の分割板バネ片１１Ｂを上方から重ね合わせる場合を示しており、このとき１枚目の分割板バネ片１１の第１領域１２ａ（第４領域１３ａ）上に２枚目の分割板バネ片１１の第２領域１２ｂ（第５領域１３ｂ）が重なるようにする。 FIG. 13 is a perspective view showing an assembly process of a leaf spring for a lens driving device according to the second embodiment of the present invention, and FIG. 14 is a height relationship of the leaf spring for the lens driving device according to the second embodiment of the present invention. FIG.
As shown in these drawings, the leaf spring 1B for the lens driving device according to the second embodiment sequentially superimposes the four divided leaf spring pieces 11B formed in the same shape by the press process while rotating by 90 °. Assembled by. FIG. 13 shows a case where the second divided leaf spring piece 11B is superposed on the first divided leaf spring piece 11B from above. At this time, the first region 12a of the first divided leaf spring piece 11 is shown. The second region 12b (fifth region 13b) of the second divided leaf spring piece 11 is overlapped on the (fourth region 13a).

このようにすると、分割板バネ片１１Ｂの各領域１２ａ、１２ｂ（１３ａ、１３ｂ）は、各領域１２ａ、１２ｂ（１３ａ、１３ｂ）間に形成される段差部１２ｄ（１３ｃ）の作用により、相対的に傾斜することなく重なり合う。これにより、各分割板バネ片１１Ｂの同じ領域１２ａ、１２ｂ（１３ａ、１３ｂ）同士を同一平面上に位置させることができる。図１４は、１枚目と２枚目の第２領域１２ｂ（第５領域１３ｂ）が同一平面上に位置することを示している。   Thus, the regions 12a and 12b (13a and 13b) of the split leaf spring piece 11B are relatively moved by the action of the step portion 12d (13c) formed between the regions 12a and 12b (13a and 13b). Overlapping without tilting. Thereby, the same area | regions 12a and 12b (13a, 13b) of each division | segmentation leaf | plate spring piece 11B can be located on the same plane. FIG. 14 shows that the first and second second regions 12b (fifth regions 13b) are located on the same plane.

また、３枚目、４枚目も同様に重ねていくが、４枚目を重ねるときは、４枚目の分割板バネ片１１Ｂの第１領域１２ａ（第４領域１３ａ）を１枚目の分割板バネ片１１Ｂの第２領域１２ｂの下側に入り込ませる。その結果、すべての分割板バネ片１１Ｂが相対的に傾斜することなく重なり合って環状のフレーム部２とバネ部３を形成するとともに、４本のバネ部３が同一平面上に位置するレンズ駆動装置用板バネ１Ｂが得られる。   In addition, the third and fourth sheets are similarly stacked. When the fourth sheet is stacked, the first area 12a (fourth area 13a) of the fourth divided leaf spring piece 11B is replaced with the first sheet. It is made to enter the lower side of the 2nd field 12b of division leaf spring piece 11B. As a result, all the divided leaf spring pieces 11B overlap with each other without being inclined relatively to form the annular frame portion 2 and the spring portion 3, and the lens driving device in which the four spring portions 3 are located on the same plane. A plate spring 1B is obtained.

このように、本実施形態において、同一形状に形成されるＮ枚の分割板バネ片を組み合わせてレンズ駆動装置用板バネを構成するので、エッチング工法に比べて製造時間を短縮できるプレス工法で製造しても、Ｎ本のバネ部を同寸法とし、安定した性能が得られる。しかも、Ｎ枚の分割板バネ片は、互いに重なり合う状態で組み合わされても、Ｎ本のバネ部を同一平面上に位置させるための段差部を有するので、各バネ部の位置誤差に起因する性能の低下も回避できる。 In this way, in this embodiment, since the leaf spring for the lens driving device is configured by combining N divided leaf spring pieces formed in the same shape, it is manufactured by a press method that can reduce the manufacturing time compared to the etching method. Even so, the N spring portions have the same dimensions, and stable performance can be obtained. Moreover, even if the N divided leaf spring pieces are combined in an overlapping state, the N divided leaf spring pieces have a step portion for positioning the N spring portions on the same plane, so that the performance caused by the position error of each spring portion. It is possible to avoid the decrease of

以上、本発明の好ましい実施形態について詳述したが、本発明は上述した実施形態に限定されるものではなく、特許請求の範囲に記載された本発明の要旨の範囲内において、種々の変形、変更が可能である。
例えば、組み合わせる分割板バネ片の枚数、バネ部の本数、バネ部の形状、フレーム部の形状などが前記実施形態のものに限定されないことは勿論である。 The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments, and various modifications may be made within the scope of the gist of the present invention described in the claims. It can be changed.
For example, the number of divided leaf spring pieces to be combined, the number of spring portions, the shape of the spring portion, the shape of the frame portion, and the like are of course not limited to those of the above embodiment.

１、１Ｂ…レンズ駆動装置用板バネ、２…フレーム部、２ａ…固定孔、３…バネ部、３ａ…第１腕部、３ｂ…第２腕部、１１、１１Ｂ…分割板バネ片、１２、１２Ｂ…分割フレーム片、１２ａ…第１領域、１２ｂ…第２領域、１２ｃ…第３領域、１２ｄ…第１段差部、１２ｅ…第２段差部、１２ｆ…位置決め孔、１３…バネ片、１３ａ…第４領域、１３ｂ…第５領域、１３ｃ…段差部   DESCRIPTION OF SYMBOLS 1, 1B ... Leaf spring for lens driving devices, 2 ... Frame portion, 2a ... Fixing hole, 3 ... Spring portion, 3a ... First arm portion, 3b ... Second arm portion, 11, 11B ... Split leaf spring piece, 12 , 12B ... divided frame pieces, 12a ... first region, 12b ... second region, 12c ... third region, 12d ... first step portion, 12e ... second step portion, 12f ... positioning hole, 13 ... spring piece, 13a ... 4th area | region, 13b ... 5th area | region, 13c ... level | step-difference part

Claims (3)

固定部材に固定される環状のフレーム部と、
前記フレーム部から内周側に延出し、前記フレーム部の中央部に配置されるレンズを前記フレーム部の中心軸方向に変位可能に支持するＮ本のバネ部を、を備えるレンズ駆動装置用板バネであって、
同一形状に形成されるＮ枚の分割板バネ片を備え、
Ｎ枚の前記分割板バネ片は、それぞれ、前記フレーム部の一部を形成する分割フレーム片と、該分割フレーム片から内周側に延出する１本の前記バネ部とからなり、
前記分割フレーム片は、互いに一部が重なり合う状態で周方向に並ぶことにより環状の前記フレーム部を形成するとともに、前記バネ部を延出する領域と前記バネ部を延出しない領域とを備え、その二つの領域の間に、互いに一部が重なり合ってもＮ本の前記バネ部を同一平面状に位置させるための段差部を有する
ことを特徴とするレンズ駆動装置用板バネ。 An annular frame portion fixed to the fixing member;
A plate for a lens driving device, comprising: N spring portions that extend from the frame portion to the inner peripheral side and support a lens disposed at a central portion of the frame portion so as to be displaceable in a central axis direction of the frame portion. A spring,
Comprising N split leaf spring pieces formed in the same shape,
Each of the N divided leaf spring pieces is composed of a divided frame piece that forms a part of the frame portion, and one spring portion that extends from the divided frame piece to the inner peripheral side,
The divided frame piece forms an annular frame portion by being arranged in the circumferential direction in a state where a part of the divided frame pieces overlaps , and includes a region extending the spring portion and a region not extending the spring portion, A plate spring for a lens driving device, comprising a step portion for positioning the N spring portions on the same plane even when part of the two regions overlap each other. 前記分割フレーム片は、互いに重なり合う領域に位置決め孔を備え、互いに重なり合う前記分割フレーム片同士の位置決め孔に位置決め部材を貫通させることにより位置決めされることを特徴とする請求項１に記載のレンズ駆動装置用板バネ。   2. The lens driving device according to claim 1, wherein the divided frame pieces are provided with positioning holes in regions where they are overlapped with each other, and are positioned by penetrating a positioning member through the positioning holes of the overlapping divided frame pieces. Leaf spring for use. 前記分割フレーム片は、異なる組み合わせて３枚以上が重なり合う領域を複数備え、これらの領域にそれぞれ前記位置決め孔を備えることを特徴とする請求項２に記載のレンズ駆動装置用板バネ。
3. The plate spring for a lens driving device according to claim 2, wherein the divided frame pieces include a plurality of regions in which three or more pieces overlap each other in different combinations, and each of the regions includes the positioning hole.
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