JP2006243320A - Lens drive device - Google Patents

Lens drive device Download PDF

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JP2006243320A
JP2006243320A JP2005058485A JP2005058485A JP2006243320A JP 2006243320 A JP2006243320 A JP 2006243320A JP 2005058485 A JP2005058485 A JP 2005058485A JP 2005058485 A JP2005058485 A JP 2005058485A JP 2006243320 A JP2006243320 A JP 2006243320A
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holder
leaf spring
lens
outer peripheral
inner peripheral
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Kokichi Terajima
厚吉 寺嶋
Kunio Ko
國雄 黄
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ARIMA DEVICE KK
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ARIMA DEVICE KK
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Abstract

<P>PROBLEM TO BE SOLVED: To improve durability of a lens drive device by relieving stresses acting on the connecting parts of a plate spring with a holder and fixing members, the plate spring being used to elastically support a holder holding a lens, thereby preventing buckling of the plate spring. <P>SOLUTION: The holder for holding the lens, to which an annular drive coil is attached, and the upper and lower fixing members are movably supported by the plate spring 15, in which the connection parts 15p with an internal circumference part 15a formed by three notches 15k surrounded by two arcuate gentle curves provided every 120° and the connection parts 15q with an external circumferential part 15 are connected by gentle curves. This distributes stresses applied to an area in the vicinity of each connecting part 15p of the plate spring 15 with the holder and an area in the vicinity of each connecting part 15q of the plate spring 15 with the upper and lower fixing members. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、カメラ等の対物レンズの駆動装置に関するもので、特に、耐久性に優れたレンズ駆動装置に関する。   The present invention relates to a drive device for an objective lens such as a camera, and more particularly to a lens drive device with excellent durability.

近年、携帯電話等に搭載されるカメラは画素数が増大されるとともに、ズーム処理やマクロ処理等の高機能化が進んでいることから、搭載されるレンズ系についても、従来の固定焦点のものだけでなく、可動焦点のものも投入されてきている。この可動焦点のレンズ系の駆動方式としては、圧電素子を動力源に用いたもの（例えば、特許文献１参照）や、ステッピングモータを動力源に用いたもの（例えば、特許文献２参照）、あるいは、ボイスコイルモータを動力源に用いたもの等が提案されている（例えば、特許文献３参照）。
図６（ａ）は、ボイスコイルモータを用いたレンズ駆動装置の一構成例を示す図で、このレンズ駆動装置５０は、軟鉄等の磁性体から成るコの字型円筒形状ヨーク５１と、上記ヨーク５１の外壁に取付けられるリング状のマグネット５２と、中央位置にレンズ５３を保持するキャリア（レンズホルダー）５４と、このキャリア５４に装着される駆動用コイル５５と、上記ヨーク５１が装着されるベース５６と、上記ベース５６を支えるフレーム５７と、上記キャリア５４を上下で支持する２個のスプリング５８Ａ，５８Ｂと、このスプリング５８Ａ，５８Ｂの上下を覆う２個のキャップ５９Ａ，５９Ｂとを備えている。
上記駆動用コイル５５は、上記ヨーク５１と上記マグネット５２とにより印加される、コイル周りに放射状に分布する磁界中に設置されているので、上記駆動用コイル５５に通電すると、図６（ｂ）に示すように、上記駆動用コイル５５に被写体の方向へ向けたローレンツ力が発生して、上記キャリア５４を上記スプリング５８Ａ，５８Ｂの復元力と釣り合った位置に移動させることができる。したがって、上記駆動用コイル５５に通電する電流値を制御することにより、上記キャリア５４の移動量を制御して、上記レンズ５３の位置を制御することができる。 In recent years, cameras mounted on mobile phones and the like have increased the number of pixels, and advanced functions such as zoom processing and macro processing have been advanced. Not only that, but those with movable focus have been introduced. As a driving system for the movable focus lens system, a piezoelectric element is used as a power source (for example, refer to Patent Document 1), a stepping motor is used as a power source (for example, refer to Patent Document 2), or A device using a voice coil motor as a power source has been proposed (see, for example, Patent Document 3).
FIG. 6A is a diagram showing a configuration example of a lens driving device using a voice coil motor. The lens driving device 50 includes a U-shaped cylindrical yoke 51 made of a magnetic material such as soft iron, and the above-described lens driving device 50. A ring-shaped magnet 52 attached to the outer wall of the yoke 51, a carrier (lens holder) 54 holding the lens 53 at the center position, a driving coil 55 attached to the carrier 54, and the yoke 51 are attached. A base 56, a frame 57 that supports the base 56, two springs 58A and 58B that support the carrier 54 above and below, and two caps 59A and 59B that cover the top and bottom of the springs 58A and 58B are provided. Yes.
Since the driving coil 55 is installed in a magnetic field applied by the yoke 51 and the magnet 52 and distributed radially around the coil, when the driving coil 55 is energized, FIG. As shown, a Lorentz force directed toward the subject is generated in the driving coil 55, and the carrier 54 can be moved to a position balanced with the restoring force of the springs 58A and 58B. Therefore, the position of the lens 53 can be controlled by controlling the amount of movement of the carrier 54 by controlling the value of the current supplied to the driving coil 55.

下側のスプリング５８Ｂは、詳細には、上記キャリア５４の底部とベース５６との間に固定され、上側のスプリング５８Ａは、上記キャリア５４の最上部とフレーム５７との間に固着される。上記２個のスプリング５８Ａ，５８Ｂは、同一の形状を有するリン青銅等の金属性の板バネから成る同一品であり、図７に示すように、板バネの内周側に形成された１２０°毎の切り欠き溝５８ｋにより、内周部５８ａと外周部５８ｂと、内周部５８ａと外周部５８ｂとを連結する３つの連結部５８ｃとに分けられ、この連結部５８ｃが可動部である上記キャリア５４と固定部であるフレーム５７及びベース５６とを可動支持するバネ部材の機能を有する。なお、上記スプリング５８Ａ，５８Ｂは、詳細には、その内周側において、上記キャリア５４に勘合し、熱カシメ等により固定され、その外周部５８ｂは、フレーム５７及びベース５６に接着及び熱カシメ等により固定され、その上部及び下部には、それぞれ、キャップ５９Ａ及びキャップ５９Ｂが取付けられる。
特開２００２−１８９１６５号公報 特開２００４−２５８１１１号公報 特開２００４−２８００３１号公報 Specifically, the lower spring 58B is fixed between the bottom portion of the carrier 54 and the base 56, and the upper spring 58A is fixed between the uppermost portion of the carrier 54 and the frame 57. The two springs 58A and 58B are the same product made of a metallic leaf spring such as phosphor bronze having the same shape, and are 120 ° formed on the inner peripheral side of the leaf spring as shown in FIG. Each notch groove 58k is divided into an inner peripheral portion 58a and an outer peripheral portion 58b, and three connecting portions 58c that connect the inner peripheral portion 58a and the outer peripheral portion 58b, and the connecting portion 58c is a movable portion. It has a function of a spring member that movably supports the carrier 54 and the frame 57 and the base 56 which are fixed portions. More specifically, the springs 58A and 58B are fitted to the carrier 54 on the inner peripheral side and fixed by heat caulking or the like, and the outer peripheral part 58b is bonded to the frame 57 and the base 56, heat caulking or the like. The cap 59A and the cap 59B are attached to the upper part and the lower part, respectively.
JP 2002-189165 A JP 2004-258111 A JP 2004-280031 A

ところで、上記従来のスプリング５８Ａ，５８Ｂは、図８（ａ），（ｂ）に示すように、上記連結部５８ｃが、板バネの径方向に突出する接続部５８ｐ，５８ｑと、上記板バネの周方向に沿った帯状のバネ部である連結部５８ｚとから構成されており、かつ、上記接続部５８ｐ，５８ｑが上記連結部５８ｚとも直交しているような形態となっている。このため、上記スプリング５８Ａ，５８Ｂが、キャリア５４の移動に伴って、上に凸または下に凸な状態に変形する際に、上記スプリング５８Ａ，５８Ｂと上記キャリア５４との接続点Ｐ、及び、上記フレーム５７及びベース５６との接続点Ｑには、板バネの復元力によるモーメントｍがそれぞれ作用するが、上記スプリング５８Ａ，５８Ｂでは、上記のように、上記キャリア５４と上記連結部５８ｚ及び上記フレーム５７及びベース５６とが板バネの径方向に突出する接続部５８ｐ，５８ｑにより連結されているため、上記接続部５８ｐ，５８ｑに上記モーメントｍによる応力が集中してしまい、上記接続部５８ｐ，５８ｑが座屈してしまう恐れがあった。   By the way, as shown in FIGS. 8 (a) and 8 (b), the conventional springs 58A and 58B are configured so that the connecting portion 58c is connected to the connecting portions 58p and 58q projecting in the radial direction of the leaf spring and the leaf spring. The connecting portion 58z is a belt-like spring portion along the circumferential direction, and the connecting portions 58p and 58q are orthogonal to the connecting portion 58z. For this reason, when the springs 58A and 58B are deformed upward or downward as the carrier 54 moves, the connection point P between the springs 58A and 58B and the carrier 54, and The moment m due to the restoring force of the leaf spring acts on the connection point Q between the frame 57 and the base 56, but in the springs 58A and 58B, as described above, the carrier 54, the connecting portion 58z, and the Since the frame 57 and the base 56 are connected by the connecting portions 58p and 58q protruding in the radial direction of the leaf spring, stress due to the moment m is concentrated on the connecting portions 58p and 58q, and the connecting portions 58p and 58p, There was a risk that 58q would buckle.

本発明は、従来の問題点に鑑みてなされたもので、レンズを保持するホルダーを弾性支持する板バネの、ホルダーや固定部材との接続部に作用する応力を緩和して上記板バネの座屈を防止し、レンズ駆動装置の耐久性を向上させることを目的とする。   The present invention has been made in view of the conventional problems. The leaf spring seat is formed by relieving the stress acting on the connection portion between the holder and the fixing member of the leaf spring that elastically supports the holder that holds the lens. The object is to prevent bending and improve the durability of the lens driving device.

本発明者らは、鋭意検討を重ねた結果、板バネとホルダーや固定部材との接続部の形状を滑らかな曲線として、上記接続部に作用する応力を分散させるようにすれば、上記接続部の座屈を防止することができることを見出し、本発明に到ったものである。
すなわち、本発明の請求項１に記載の発明は、レンズを保持するホルダーと、内周部が上記ホルダーに固定され、外周部が固定部材に固定され、上記内周部と上記外周部とが、複数の切り欠き溝により形成された複数の連結部により連結された板バネと、上記ホルダーに装着された環状の駆動用コイルと、上記コイルに放射状の駆動用磁界を印加する磁界発生手段とを備え、上記駆動用コイルに通電する電流値と上記各板バネの復元力とにより上記レンズの移動量を制御するレンズ駆動装置であって、少なくとも、上記連結部の外周側と上記内周部の外周側、及び、上記連結部の内周側と上記外周部の内周側とが滑らかに連結されるように、上記切り欠き溝を設けたことを特徴とするものである。 As a result of intensive studies, the present inventors have made the connection portion between the leaf spring and the holder or the fixing member a smooth curve, and if the stress acting on the connection portion is dispersed, the connection portion As a result, the inventors have found that buckling can be prevented.
That is, according to the first aspect of the present invention, the holder for holding the lens, the inner peripheral portion is fixed to the holder, the outer peripheral portion is fixed to the fixing member, and the inner peripheral portion and the outer peripheral portion are connected to each other. A leaf spring connected by a plurality of connecting portions formed by a plurality of cutout grooves, an annular driving coil mounted on the holder, and a magnetic field generating means for applying a radial driving magnetic field to the coil A lens driving device that controls the amount of movement of the lens by a current value energized to the driving coil and a restoring force of each leaf spring, and at least the outer peripheral side of the connecting portion and the inner peripheral portion The notch groove is provided so that the outer peripheral side of the connecting portion and the inner peripheral side of the connecting portion and the inner peripheral side of the outer peripheral portion are smoothly connected.

請求項２に記載の発明は、請求項１に記載のレンズ駆動装置において、上記複数の連結部を上記板バネの中心に対して互いに点対称な位置に設けたものである。
請求項３に記載の発明は、請求項２に記載のレンズ駆動装置において、上記切り欠き溝の本数をＮとし、この切り欠き溝の、上記板バネ中心とホルダーとの接続箇所を結ぶ線分と、板バネ中心と固定部材との接続箇所とを結ぶ線分とのなす角を（２π／Ｎ）よりも大きくしたものである。
請求項４に記載の発明は、請求項１〜請求項３のいずれかに記載のレンズ駆動装置において、上記各連結部の幅を一様にしたものである。
また、請求項５に記載の発明は、請求項１〜請求項４のいずれかに記載のレンズ駆動装置において、上記ホルダーと上記板バネとの接続箇所近傍及び上記固定部材と上記板バネとの接続箇所近傍のいずれか一方または両方に緩衝部材を配設したものである。 According to a second aspect of the present invention, in the lens driving device according to the first aspect, the plurality of connecting portions are provided at positions that are point-symmetric with respect to the center of the leaf spring.
According to a third aspect of the present invention, in the lens driving device according to the second aspect of the present invention, the number of the notch grooves is N, and a line segment connecting the connection portion between the leaf spring center and the holder of the notch groove is N. And the angle formed by the line segment connecting the center of the leaf spring and the connecting portion of the fixing member is larger than (2π / N).
According to a fourth aspect of the present invention, in the lens driving device according to any one of the first to third aspects, the width of each of the connecting portions is made uniform.
According to a fifth aspect of the present invention, in the lens driving device according to any one of the first to fourth aspects, the vicinity of the connection portion between the holder and the leaf spring, and the fixing member and the leaf spring. A buffer member is disposed in one or both of the vicinity of the connection location.

本発明によれば、環状の駆動用コイルを装着した、レンズを保持するホルダーと、固定部材とを、その内周部が上記ホルダーに連結され、その外周部が上記固定部材に連結され、上記内周部と上記外周部とが複数の連結部により連結された板バネにより連結する構成のレンズ駆動装置において、上記板バネの連結部の外周側と上記内周部の外周側、及び、上記連結部の内周側と上記外周部の内周側とを滑らかな曲線で連結するようにしたので、上記接続部に作用する応力を分散させることができ、上記接続部の座屈を防止することができる。このとき、上記複数の連結部を上記板バネの中心に対して互いに点対称な位置に配置するとともに、各連結部の幅を一様にすれば、板バネの動きを更にスムースにすることができ、ホルダーに保持されたレンズを一層滑らかに駆動することができる。
また、上記切り欠き溝の本数をＮとし、この切り欠き溝の、上記板バネ中心とホルダーとの接続箇所を結ぶ線分と、板バネ中心と固定部材との接続箇所とを結ぶ線分とのなす角を（２π／Ｎ）よりも大きく設定すれば、レンズホルダーを大きなストロークにて移動させることができる。
また、上記ホルダーと上記板バネとの接続箇所近傍及び上記固定部材と上記板バネとの接続箇所近傍のいずれか一方または両方に緩衝部材を配設すれば、接続部に作用する応力を緩和することができるので、耐久性を更に向上させることができる。更に、外部からの不要な振動が上記緩衝部材により吸収されるので、レンズの振動を抑制することができる。 According to the present invention, the holder for holding the lens, which is mounted with the annular driving coil, and the fixing member, the inner peripheral part thereof is connected to the holder, the outer peripheral part is connected to the fixing member, In the lens driving device configured to connect the inner peripheral portion and the outer peripheral portion by a leaf spring connected by a plurality of connecting portions, the outer peripheral side of the connecting portion of the plate spring, the outer peripheral side of the inner peripheral portion, and the above Since the inner peripheral side of the connecting portion and the inner peripheral side of the outer peripheral portion are connected with a smooth curve, the stress acting on the connecting portion can be dispersed and buckling of the connecting portion is prevented. be able to. At this time, if the plurality of connecting portions are arranged at points symmetrical to each other with respect to the center of the plate spring, and the width of each connecting portion is made uniform, the movement of the plate spring can be further smoothed. The lens held by the holder can be driven more smoothly.
Further, the number of the notch grooves is N, and a line segment connecting the connection point between the leaf spring center and the holder, and a line segment connecting the leaf spring center and the connection point of the notch groove. If the angle formed by is set larger than (2π / N), the lens holder can be moved with a large stroke.
Further, if a buffer member is disposed in the vicinity of the connection portion between the holder and the leaf spring and in the vicinity of the connection portion between the fixing member and the leaf spring, the stress acting on the connection portion is relieved. Therefore, durability can be further improved. Furthermore, since unnecessary vibrations from the outside are absorbed by the buffer member, lens vibration can be suppressed.

以下、本発明の最良の形態について、図面に基づき説明する。
図１は、本発明の最良の形態に係るレンズ駆動装置１０の構成を示す模式図で、同図において、１１はレンズ、１２はこのレンズ１１を保持するホルダー、１３は上記ホルダーに装着される環状の駆動用コイルで、この駆動用コイル１３は、図示しない磁界発生手段により印可される、コイル周りに放射状に分布する磁界Ｈ中に設置されている。また、１５Ａ，１５Ｂは、その外周部１５ｂが上記上部及び下部の固定部材１４Ａ，１４Ｂに固定され、その内周部１５ａが上記ホルダー１２に固定された、上記ホルダー１２を上記固定部材１４Ａ，１４Ｂに可動支持する板バネである。
図２は上記板バネ１５（１５Ａ，１５Ｂ）の平面図で、本発明による板バネ１５は、リン青銅等から成る円板状のバネ部材に、２本の円弧状の滑らかな曲線で囲まれた３つの切り欠き溝１５ｋを、上記板バネの中心に対して互いに点対称な位置に設けたもので、これにより、上記板バネ１５は、上記ホルダー１２の上部側及び下部側に固定される内周部１５ａと、上記固定部材１４Ａ，１４Ｂに連結される外周部１５ｂと、上記内周部１５ａと外周部１５ｂとを連結する、それぞれが所定の角度間隔で配置された３つの連結部１５ｃが形成される。本例の板バネ１５に設けた３つの切り欠き溝１５ｋは２本の円弧状の滑らかな曲線で囲まれた形状であるので、上記板バネ１５の上記ホルダー１２との接続箇所となる、上記連結部１５ｃと上記内周部１５ａとの接続部１５ｐと、上記板バネ１５の上記固定部材１４Ａ，１４Ｂとの接続箇所となる、上記連結部１５ｃと上記外周部１５ｂとの接続部１５ｑとは、ともに滑らかな曲線で連結されることになる。
また、本例では、各連結部１５ｃの幅を一様にするとともに、上記切り欠き溝１５ｋを形成する範囲、すなわち、上記板バネ１５の中心とホルダー１２との接続部１５ｐとを結ぶ線分と、板バネ１５の中心と上記固定部材１４Ａ，１４Ｂとの接続部１５ｑとを結ぶ線分とのなす角度を、上記切り欠き溝１５ｋ，１５ｋ間の角度θ＝１２０°よりも大きくして、板バネ１５の径方向に、上記切り欠き溝１５ｋが２個ある部分を設けている。 Hereinafter, the best mode of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram showing a configuration of a lens driving device 10 according to the best mode of the present invention, in which 11 is a lens, 12 is a holder for holding the lens 11, and 13 is mounted on the holder. The driving coil 13 is an annular driving coil, and is installed in a magnetic field H distributed radially around the coil, which is applied by a magnetic field generating means (not shown). 15A, 15B has an outer peripheral portion 15b fixed to the upper and lower fixing members 14A, 14B, and an inner peripheral portion 15a fixed to the holder 12. The holder 12 is fixed to the fixing members 14A, 14B. It is a leaf spring that is movably supported.
FIG. 2 is a plan view of the leaf spring 15 (15A, 15B). The leaf spring 15 according to the present invention is surrounded by a circular spring member made of phosphor bronze or the like with two arc-shaped smooth curves. The three notch grooves 15k are provided at positions symmetrical with respect to the center of the leaf spring, whereby the leaf spring 15 is fixed to the upper side and the lower side of the holder 12. Three connecting portions 15c that connect the inner peripheral portion 15a, the outer peripheral portion 15b connected to the fixing members 14A and 14B, and the inner peripheral portion 15a and the outer peripheral portion 15b, each arranged at a predetermined angular interval. Is formed. Since the three notch grooves 15k provided in the leaf spring 15 of this example have a shape surrounded by two circular arc-like smooth curves, the leaf spring 15 is connected to the holder 12 above. A connecting portion 15p between the connecting portion 15c and the inner peripheral portion 15a, and a connecting portion 15q between the connecting portion 15c and the outer peripheral portion 15b, which is a connecting portion between the fixing members 14A and 14B of the leaf spring 15. Both are connected with a smooth curve.
Further, in this example, the width of each connecting portion 15c is made uniform and the range in which the notch groove 15k is formed, that is, a line segment connecting the center of the leaf spring 15 and the connecting portion 15p of the holder 12 is used. And the angle formed by the line connecting the center of the leaf spring 15 and the connecting portion 15q of the fixing members 14A and 14B is larger than the angle θ = 120 ° between the notch grooves 15k and 15k, In the radial direction of the leaf spring 15, a portion having two notch grooves 15k is provided.

図３は、上記板バネ１５の取付方法を示す図で、上側の板バネ１５Ａは上部の固定部材１４Ａと上記ホルダー１２の頂部側とに取付けられ、下側の板バネ１５Ｂは下部の固定部材１４Ｂと上記ホルダー１２の底部側に取付けられる。なお、同図の符号１２ｍ，１２ｎは、上記ホルダー１２の頂部側と底部側にそれぞれ設けられた、上記ホルダー１２と板バネ１５とを接着するための接着層で、符号１４ｍ，１４ｎは、上記固定部材１４Ａ，１４Ｂと板バネ１５とをそれぞれ接着するための接着層である。
これにより、上記連結部１５ｃの内周側の各接続部１５ｐが上記ホルダー１２の各接続部１２ｐにおいて接続され、外周側の各接続部１５ｑが上記固定部材１４Ａ，１４Ｂの各接続部１４ｑにおいて接続される。すなわち、上記ホルダー１２は、帯状のバネ部材である上記板バネの連結部１５ｃにより、上記固定部材１４Ａ，１４Ｂに可動支持される。
なお、本例では、上側の板バネ１５Ａでは接続部１５ｐから接続部１５ｑへ向かう方向が上記板バネ１５Ａの中心から見て時計周りとし、下側の板バネ１５Ｂでは反時計回りとすることにより、上側の板バネ１５Ａの接続箇所と下側の板バネ１５Ｂの接続箇所とを、上記板バネ１５Ａ，１５Ｂの中心、すなわち、上記レンズ１１の光軸に対して対角の位置になるようにしているが、上側の板バネを反時計周りとし、下側の板バネを時計周りにしてもよいし、上下の板バネをともに上記板バネ１５Ａまたは板バネ１５Ｂとしてもよい。
また、本例では、図２に示すように、上記ホルダー１２と板バネ１５との接続部、及び、上記固定部材１４Ａ，１４Ｂと上記板バネ１５との上記接続部（接続部１５ｐまたは、接続部１５ｑ）近傍に、例えば、弾性を有する樹脂などを塗布して、これを緩衝部材１６としている。 FIG. 3 is a view showing a method of attaching the plate spring 15. The upper plate spring 15A is attached to the upper fixing member 14A and the top side of the holder 12, and the lower plate spring 15B is the lower fixing member. 14B and the bottom side of the holder 12 are attached. Reference numerals 12m and 12n in the figure are adhesive layers for bonding the holder 12 and the leaf spring 15 provided on the top side and bottom side of the holder 12, respectively. It is an adhesive layer for bonding the fixing members 14A and 14B and the leaf spring 15 respectively.
Thereby, each connection part 15p of the inner periphery side of the said connection part 15c is connected in each connection part 12p of the said holder 12, and each connection part 15q of outer periphery side is connected in each connection part 14q of said fixing member 14A, 14B. Is done. That is, the holder 12 is movably supported by the fixing members 14A and 14B by the plate spring connecting portion 15c which is a belt-like spring member.
In this example, in the upper leaf spring 15A, the direction from the connecting portion 15p to the connecting portion 15q is clockwise when viewed from the center of the leaf spring 15A, and the lower leaf spring 15B is counterclockwise. The connection location of the upper leaf spring 15A and the connection location of the lower leaf spring 15B are set to be diagonal with respect to the centers of the leaf springs 15A and 15B, that is, the optical axis of the lens 11. However, the upper leaf spring may be counterclockwise, the lower leaf spring may be clockwise, and both the upper and lower leaf springs may be the leaf spring 15A or the leaf spring 15B.
Further, in this example, as shown in FIG. 2, the connecting portion between the holder 12 and the leaf spring 15 and the connecting portion (the connecting portion 15p or the connecting portion between the fixing members 14A, 14B and the leaf spring 15). In the vicinity of the portion 15q), for example, an elastic resin or the like is applied to form the buffer member 16.

次に、本発明による板バネ１５の作用について説明する。
上記構成のレンズ駆動装置１０において、駆動用コイル１３に駆動電流を流すと、図４に示すように、ローレンツ力によりホルダー１２が上方または下方に移動する。このとき、上記板バネ１５と上記ホルダー１２との接続点である接続部１５ｐ近傍、及び、上記固定部材１４Ａ，１４Ｂとの接続点である接続部１５ｐ近傍に応力ｆが作用する。しかしながら、本例では、上記連結部１５ｃの接続部１５ｐ，１５ｑ近傍は、ホルダー１２及び上下の固定部材１４Ａ，１４Ｂと滑らかな曲線で連結されており、かつ、各連結部１５ｃの幅を一様にしているので、上記従来例のスプリング５８Ａ，５８Ｂとは異なり、上記接続部１５ｐ，１５ｑ近傍に応力が集中することがない。更に、本例では、上記接続部１５ｐ，１５ｑ近傍には樹脂などを塗布した緩衝部材１６が配置されているので、上記接続部１５ｐ，１５ｑ近傍に作用する応力を緩和することができる。したがって、上記ホルダー１２が繰返し上下しても、上記各接続部１５ｐ，１５ｑが座屈する恐れがないので、レンズ駆動装置１０の耐久性を大幅に向上させることができる。
更に、本例では、上記切り欠き溝１５ｋの範囲を、上記切り欠き溝１５ｋを配置する角θ＝１２０°よりも大きくして、上記連結部１５ｃの長さを長く設定しているので、連結部１５ｃのバネの形状効果と相俟って、レンズ１１を保持する上記ホルダー１２を大きなストロークにて移動させることができる。 Next, the operation of the leaf spring 15 according to the present invention will be described.
In the lens driving device 10 configured as described above, when a driving current is passed through the driving coil 13, the holder 12 moves upward or downward by Lorentz force as shown in FIG. At this time, the stress f acts in the vicinity of the connection portion 15p, which is a connection point between the plate spring 15 and the holder 12, and in the vicinity of the connection portion 15p, which is a connection point between the fixing members 14A and 14B. However, in this example, the vicinity of the connecting portions 15p and 15q of the connecting portion 15c is connected to the holder 12 and the upper and lower fixing members 14A and 14B with a smooth curve, and the width of each connecting portion 15c is uniform. Therefore, unlike the conventional springs 58A and 58B, stress does not concentrate in the vicinity of the connecting portions 15p and 15q. Furthermore, in this example, since the buffer member 16 coated with resin or the like is disposed in the vicinity of the connection portions 15p and 15q, the stress acting on the vicinity of the connection portions 15p and 15q can be relaxed. Therefore, even if the holder 12 is repeatedly moved up and down, the connection portions 15p and 15q are not likely to buckle, so that the durability of the lens driving device 10 can be greatly improved.
Further, in this example, the range of the notch groove 15k is set larger than the angle θ = 120 ° at which the notch groove 15k is arranged, and the length of the connecting portion 15c is set to be long. Combined with the shape effect of the spring of the portion 15c, the holder 12 holding the lens 11 can be moved with a large stroke.

このように、本最良の形態によれば、環状の駆動用コイル１３を装着した、レンズ１１を保持するホルダー１２と、上下の固定部材１４Ａ，１４Ｂとを、１２０°毎に設けられた、２本の円弧状の滑らかな曲線で囲まれた３つの切り欠き溝１５ｋにより形成された、内周部１５ａとの接続部１５ｐと外周部１５ｂとの接続部１５ｑとがともに滑らかな曲線で連結された連結部１５ｃを備えた板バネ１５で可動支持することにより、上記板バネ１５の上記ホルダー１２との接続部１５ｐ近傍及び上記上下の固定部材１４Ａ，１４Ｂとの接続部１５ｑ近傍に作用する応力を分散させるようにしたので、板バネ１５の耐久性を向上させることができ、レンズ駆動装置１０の耐久性を大幅に向上させることができる。
また、上記連結部１５ｃを上記板バネ１５の中心に対して互いに点対称な位置に配置したので、ホルダー１２に保持されたレンズ１１を滑らかに駆動することができる。
更に、上記板バネ１５の連結部１５ｃと内周部１５ａ及び外周部１５ｂとの接続部１５ｐ，１５ｑ近傍に緩衝部材１６を配設して、上記接続部１５ｐ，１５ｑに作用する応力を緩和するようにしたので、板バネ１５の耐久性を更に向上させることができる。 As described above, according to the best mode, the holder 12 that holds the lens 11 and the upper and lower fixing members 14A and 14B, to which the annular driving coil 13 is attached, are provided every 120 °. A connecting portion 15p connected to the inner peripheral portion 15a and a connecting portion 15q connected to the outer peripheral portion 15b, which are formed by three notched grooves 15k surrounded by a circular arc-like smooth curve, are connected together by a smooth curve. By being movably supported by the leaf spring 15 having the connecting portion 15c, the stress acting on the leaf spring 15 in the vicinity of the connection portion 15p with the holder 12 and in the vicinity of the connection portion 15q with the upper and lower fixing members 14A and 14B. Therefore, the durability of the leaf spring 15 can be improved, and the durability of the lens driving device 10 can be greatly improved.
Further, since the connecting portion 15c is disposed at a point-symmetrical position with respect to the center of the leaf spring 15, the lens 11 held by the holder 12 can be driven smoothly.
Further, a buffer member 16 is disposed in the vicinity of the connecting portions 15p and 15q between the connecting portion 15c of the leaf spring 15 and the inner peripheral portion 15a and the outer peripheral portion 15b to relieve stress acting on the connecting portions 15p and 15q. Since it did in this way, durability of the leaf | plate spring 15 can be improved further.

なお、上記最良の形態では、板バネ１５のホルダー１２との接続箇所となる、上記連結部１５ｃと上記内周部１５ａとの接続部１５ｐと、上記固定部材１４Ａ，１４Ｂとの接続箇所となる、上記連結部１５ｃと上記外周部１５ｂとの接続部１５ｑとを、ともに滑らかな曲線で連結したが、図５に示すように、上記内周部１５ａとの接続部１５ｐの外周側と板バネ１５の内周部１５ａの外周側、及び、上記外周部１５ｂとの接続部１５ｑの内周側と上記外周部１５ｂの内周側とが滑らかに連結されていれば、十分に上記接続部１５ｐ，１５ｑの座屈を防止することができる。
また、上記各連結部１５ｃの幅は、必ずしも一様である必要はなく、板バネ１５がホルダー１２と板バネ１５とに滑らかに連結されていれば、中央部の幅を狭くした形態など、他の形態であっても、十分にその効果を発揮することができる。
また、上記例では、切り欠き溝１５ｋの本数を３本としたが、これに限るものではなく、上記切り欠き溝１５ｋの本数は、板バネ１５の寸法や必要とされるバネ定数の値などにより適宜決定されるものである。上記切り欠き溝１５ｋの本数をＮとした場合には、上記切り欠き溝１５ｋをθ＝（２π／Ｎ）毎に配置するとともに、上記切り欠き溝１５ｋの板バネ中心とホルダー１２との接続箇所を結ぶ線分と、板バネ中心と固定部材１４Ａ，１４Ｂとの接続箇所とを結ぶ線分との成す角を上記θよりも大きく設定すれば、ホルダー１２を大きなストロークにて移動させることができる。 In the best mode, the connection portion 15p between the connecting portion 15c and the inner peripheral portion 15a, which is a connection portion between the leaf spring 15 and the holder 12, and the connection portion between the fixing members 14A and 14B. The connecting part 15c and the connecting part 15q between the outer peripheral part 15b are connected with a smooth curve, but as shown in FIG. 5, the outer peripheral side of the connecting part 15p with the inner peripheral part 15a and the leaf spring As long as the outer peripheral side of the inner peripheral portion 15a of 15 and the inner peripheral side of the connecting portion 15q with the outer peripheral portion 15b are smoothly connected to the inner peripheral side of the outer peripheral portion 15b, the connecting portion 15p is sufficient. , 15q can be prevented from buckling.
In addition, the width of each connecting portion 15c is not necessarily uniform. If the leaf spring 15 is smoothly connected to the holder 12 and the leaf spring 15, a configuration in which the width of the central portion is narrowed, etc. Even if it is another form, the effect can fully be exhibited.
In the above example, the number of the notch grooves 15k is three. However, the number of the notch grooves 15k is not limited to this, and the number of the notch grooves 15k is the size of the leaf spring 15 or the value of the required spring constant. Is appropriately determined. When the number of the notch grooves 15k is N, the notch grooves 15k are arranged at every θ = (2π / N), and the plate spring center of the notch groove 15k is connected to the holder 12 If the angle formed by the line connecting the line spring and the line connecting the leaf spring center and the connecting portion of the fixing members 14A and 14B is set to be larger than θ, the holder 12 can be moved with a large stroke. .

以上説明したように、本発明によれば、簡単な構成で板バネの接続部に作用する応力を緩和することができるので、耐久性に優れたレンズ駆動装置を得ることができる。   As described above, according to the present invention, since the stress acting on the connecting portion of the leaf spring can be relieved with a simple configuration, a lens driving device having excellent durability can be obtained.

本発明の最良の形態に係るレンズ駆動装置の構成を示す模式図である。It is a schematic diagram which shows the structure of the lens drive device which concerns on the best form of this invention. 本発明による板バネの一例を示す平面図である。It is a top view which shows an example of the leaf | plate spring by this invention. 本発明の最良の形態に係る板バネの取付方法を示す図である。It is a figure which shows the attachment method of the leaf | plate spring which concerns on the best form of this invention. 本発明による板バネの動作を説明するための図である。It is a figure for demonstrating operation | movement of the leaf | plate spring by this invention. 本発明による板バネの他の例を示す平面図である。It is a top view which shows the other example of the leaf | plate spring by this invention. 従来のレンズ駆動装置の構成を示す図である。It is a figure which shows the structure of the conventional lens drive device. 従来の板バネ（スプリング）を示す平面図である。It is a top view which shows the conventional leaf | plate spring (spring). 従来の板バネの動作を説明するための図である。It is a figure for demonstrating operation | movement of the conventional leaf | plate spring.

符号の説明Explanation of symbols

１０ レンズ駆動装置、１１ レンズ、１２ ホルダー、１３ 駆動用コイル、
１４Ａ，１４Ｂ 固定部材、１５，１５Ａ，１５Ｂ 板バネ、１５ａ 内周部、
１５ｂ 外周部、１５ｃ 連結部、１５ｋ 切り欠き溝、１６ 緩衝部材。 10 lens driving device, 11 lens, 12 holder, 13 driving coil,
14A, 14B fixing member, 15, 15A, 15B leaf spring, 15a inner periphery,
15b outer peripheral part, 15c connection part, 15k notch groove, 16 buffer member.

Claims (5)

レンズを保持するホルダーと、内周部が上記ホルダーに固定され、外周部が固定部材に固定され、上記内周部と上記外周部とが、複数の切り欠き溝により形成された複数の連結部により連結された板バネと、上記ホルダーに装着された環状の駆動用コイルと、上記コイルに放射状の駆動用磁界を印加する磁界発生手段とを備え、上記駆動用コイルに通電する電流値と上記板バネの復元力とにより上記レンズの移動量を制御するレンズ駆動装置において、少なくとも、上記連結部の外周側と上記内周部の外周側、及び、上記連結部の内周側と上記外周部の内周側とが滑らかに連結されるように、上記切り欠き溝を設けたことを特徴とするレンズ駆動装置。   A holder for holding a lens, an inner peripheral portion is fixed to the holder, an outer peripheral portion is fixed to a fixing member, and the inner peripheral portion and the outer peripheral portion are formed by a plurality of cutout grooves. A plate spring coupled to the holder, an annular drive coil mounted on the holder, and a magnetic field generating means for applying a radial drive magnetic field to the coil, and a current value for energizing the drive coil and the In the lens driving device that controls the moving amount of the lens by the restoring force of the leaf spring, at least the outer peripheral side of the connecting portion and the outer peripheral side of the inner peripheral portion, and the inner peripheral side of the connecting portion and the outer peripheral portion. A lens driving device comprising the cutout groove so that the inner peripheral side of the lens is smoothly connected. 上記複数の連結部を上記板バネの中心に対して互いに点対称な位置に設けたことを特徴とする請求項１に記載のレンズ駆動装置。   The lens driving device according to claim 1, wherein the plurality of connecting portions are provided at positions symmetrical with respect to the center of the leaf spring. 上記切り欠き溝の本数をＮとし、この切り欠き溝の、上記板バネ中心とホルダーとの接続箇所を結ぶ線分と、板バネ中心と固定部材との接続箇所とを結ぶ線分とのなす角を（２π／Ｎ）よりも大きくしたことを特徴とする請求項２に記載のレンズ駆動装置。   The number of the notch grooves is N, and a line segment connecting the connection point between the leaf spring center and the holder and a line segment connecting the plate spring center and the connection point of the fixing member is formed. The lens driving device according to claim 2, wherein the angle is larger than (2π / N). 上記各連結部の幅を一様にしたことを特徴とする請求項１〜請求項３のいずれかに記載のレンズ駆動装置。   The lens driving device according to any one of claims 1 to 3, wherein the width of each connecting portion is uniform. 上記ホルダーと上記板バネとの接続箇所近傍及び上記固定部材と上記板バネとの接続箇所近傍のいずれか一方または両方に緩衝部材を配設したことを特徴とする請求項１〜請求項４のいずれかに記載のレンズ駆動装置。
The buffer member is disposed in one or both of the vicinity of the connection portion between the holder and the leaf spring and the vicinity of the connection portion between the fixing member and the leaf spring. The lens driving device according to any one of the above.
JP2005058485A 2005-03-03 2005-03-03 Lens drive device Pending JP2006243320A (en)

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Cited By (6)

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JP2008112128A (en) * 2006-10-04 2008-05-15 Nidec Sankyo Corp Lens drive device
JP2010276850A (en) * 2009-05-28 2010-12-09 Nidec Sankyo Corp Lens drive device
CN102135656A (en) * 2010-01-26 2011-07-27 日本电产三协株式会社 Lens driving device
JP2017102444A (en) * 2015-12-01 2017-06-08 台湾東電化股▲ふん▼有限公司 Lens drive device
JP2020193687A (en) * 2019-05-30 2020-12-03 日本電産サンキョー株式会社 Spring member, actuator and lens driving device
EP4215967A1 (en) * 2014-07-24 2023-07-26 LG Innotek Co., Ltd. Lens moving apparatus

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* Cited by examiner, † Cited by third party
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JP2008112128A (en) * 2006-10-04 2008-05-15 Nidec Sankyo Corp Lens drive device
JP4495741B2 (en) * 2006-10-04 2010-07-07 日本電産サンキョー株式会社 Lens drive device
JP2010276850A (en) * 2009-05-28 2010-12-09 Nidec Sankyo Corp Lens drive device
CN102135656A (en) * 2010-01-26 2011-07-27 日本电产三协株式会社 Lens driving device
JP2011154121A (en) * 2010-01-26 2011-08-11 Nidec Sankyo Corp Lens drive device
EP4215967A1 (en) * 2014-07-24 2023-07-26 LG Innotek Co., Ltd. Lens moving apparatus
JP2017102444A (en) * 2015-12-01 2017-06-08 台湾東電化股▲ふん▼有限公司 Lens drive device
JP2020193687A (en) * 2019-05-30 2020-12-03 日本電産サンキョー株式会社 Spring member, actuator and lens driving device
JP7330761B2 (en) 2019-05-30 2023-08-22 ニデックインスツルメンツ株式会社 Spring members, actuators, and lens drivers

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