JP2005352233A - Lens driving device - Google Patents

Lens driving device Download PDF

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Publication number
JP2005352233A
JP2005352233A JP2004173623A JP2004173623A JP2005352233A JP 2005352233 A JP2005352233 A JP 2005352233A JP 2004173623 A JP2004173623 A JP 2004173623A JP 2004173623 A JP2004173623 A JP 2004173623A JP 2005352233 A JP2005352233 A JP 2005352233A
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Japan
Prior art keywords
magnet
lens holder
lens
coil
gap
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Pending
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JP2004173623A
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Japanese (ja)
Inventor
Manabu Shiraki
白木　　学
Yoshiaki Takano
義明 高野
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Shicoh Engineering Co Ltd
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Shicoh Engineering Co Ltd
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Priority to JP2004173623A priority Critical patent/JP2005352233A/en
Priority to KR1020050018048A priority patent/KR100681607B1/en
Publication of JP2005352233A publication Critical patent/JP2005352233A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/023—Mountings, adjusting means, or light-tight connections, for optical elements for lenses permitting adjustment
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/09—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted for automatic focusing or varying magnification
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B5/00—Adjustment of optical system relative to image or object surface other than for focusing
    • G03B5/04—Vertical adjustment of lens; Rising fronts
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
    • H02N2/0005—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing non-specific motion; Details common to machines covered by H02N2/02 - H02N2/16
    • H02N2/005—Mechanical details, e.g. housings
    • H02N2/0055—Supports for driving or driven bodies; Means for pressing driving body against driven body
    • H02N2/006—Elastic elements, e.g. springs
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
    • H02N2/02—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a lens driving device which can move a lens holder at a stable moving velocity, which can be made smaller in size and which hardly causes displacement of a lens by external shock. <P>SOLUTION: The lens driving device 1 is equipped with a lens holder 4 to hold a lens 2, shafts 5, 6 to guide the movement of the lens holder 4, a coil 15, and a magnet 7, and the device is characterized in that: the coil 15 is fixed to the outer periphery of the lens holder 4; insertion holes for the shafts are formed in the lens holder 4; the magnet 7 is disposed in the periphery of the coil 15 and has a gap formed by lacking a part of the coil in the circumference direction; the lens holder 4 has a hooking member 27 made of a magnetic material; the hooking member 27 is protruding outward in the radial direction and located in the gap of the magnet 7; the hooking member 27 is attracted by magnetic force to one of the ends of the magnet 7 opposing through the gap of the magnet 7; and the outer peripheries of the shafts 5, 6 are in contact with the inner surface of the insertion holes. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、デジタルカメラや携帯電話等に内蔵される携帯型小型カメラ等に用いられるズームレンズ及びオートフォーカスレンズを駆動させるレンズ駆動装置に関する。   The present invention relates to a lens driving device that drives a zoom lens and an autofocus lens used in a portable small camera or the like built in a digital camera, a cellular phone, or the like.

特許文献１には、レンズを保持するレンズホルダと、コイルと、マグネットとレンズホルダを支持する板ばねとを備え、コイルに電流を流すことで、板ばねの付勢力に抗してレンズホルダがレンズの光軸方向に移動する技術が開示されている。   Patent Document 1 includes a lens holder that holds a lens, a coil, a leaf spring that supports the magnet and the lens holder, and a lens holder that resists the urging force of the leaf spring by flowing current through the coil. A technique for moving in the optical axis direction of the lens is disclosed.

特開２００３−７５７１２号公報JP 2003-75712 A

しかし、特許文献１に記載の従来技術は、レンズホルダが板ばねの付勢力に抗して移動するので、レンズホルダの移動量に応じて付勢力が異なる為、レンズホルダの移動経路内で、安定した移動速度を得られ難いという問題がある。   However, in the prior art described in Patent Document 1, since the lens holder moves against the urging force of the leaf spring, the urging force varies depending on the amount of movement of the lens holder. There is a problem that it is difficult to obtain a stable moving speed.

また、レンズホルダの外側に突設して板ばねを設けているため、板ばねがじゃまになって装置の小型化が図り難いという問題がある。   Further, since the leaf spring is provided so as to protrude from the outside of the lens holder, there is a problem that it is difficult to reduce the size of the apparatus because the leaf spring is obstructed.

さらに、携帯型小型カメラ等は、携帯時にレンズ駆動装置が揺れや衝撃を受けることがある。このような揺れや衝撃に対して、レンズホルダががたついてレンズの位置ズレが生じるおそれがある。   Further, in a portable small camera or the like, the lens driving device may be shaken or shocked when being carried. The lens holder may rattle against such shaking or impact, and the lens may be misaligned.

本発明は、レンズホルダが安定した移動速度で移動でき、且つ装置の小型化を図るとともに、外部からの衝撃によってレンズの位置ズレが生じ難いレンズ駆動装置を得ることを目的とする。   It is an object of the present invention to obtain a lens driving device in which a lens holder can move at a stable moving speed and the size of the device can be reduced and the lens position is hardly displaced by an external impact.

前記課題を解決するために、請求項１に記載された発明は、レンズを保持するレンズホルダと、レンズホルダの移動を案内するシャフトと、コイルと、マグネットとを備え、コイルに通電してレンズホルダをレンズの光軸方向に移動させるレンズ駆動装置であって、コイルはレンズホルダの外周に固定されており、レンズホルダにはシャフトの挿通孔が形成されており、マグネットはコイルの外周側に配置され且つ周方向の一部を欠如した隙間が形成されており、レンズホルダは磁性体でできた引き寄せ部材を備え、引き寄せ部材は半径方向外側に突出してマグネットの隙間に位置しており、マグネットの隙間を介して対向するマグネットの両端部の何れか一方に引き寄せ部材が磁力により引き付けられて、挿通孔の内周面にシャフトの外周が当接していることを特徴とする。   In order to solve the above-mentioned problem, the invention described in claim 1 includes a lens holder that holds a lens, a shaft that guides the movement of the lens holder, a coil, and a magnet. A lens driving device for moving the holder in the direction of the optical axis of the lens, wherein the coil is fixed to the outer periphery of the lens holder, a shaft insertion hole is formed in the lens holder, and the magnet is disposed on the outer peripheral side of the coil. A gap that is arranged and lacks a part in the circumferential direction is formed, the lens holder includes a drawing member made of a magnetic material, and the drawing member protrudes radially outward and is located in the gap of the magnet. The attracting member is attracted by magnetic force to either one of the opposite ends of the magnet through the gap of the outer periphery of the shaft on the inner peripheral surface of the insertion hole And wherein the abutting.

請求項２に記載された発明は、レンズを保持するレンズホルダと、コイルと、マグネットとを備え、コイルに通電してレンズホルダをレンズの光軸方向に移動させるレンズ駆動装置であって、コイルはレンズホルダの外周に固定されており、マグネットはコイルの外周側に配置され且つ周方向の一部を欠如した隙間が形成されており、レンズホルダは磁性体でできた引き寄せ部材を備え、引き寄せ部材は半径方向外側に突出してマグネットの隙間に位置しており、マグネットの隙間を介して対向するマグネットの両端部の何れか一方に引き寄せ部材が磁力により引き付けられて、マグネットに引き寄せ部材が当接することを特徴とする。   The invention described in claim 2 is a lens driving device comprising a lens holder for holding a lens, a coil, and a magnet, and energizing the coil to move the lens holder in the optical axis direction of the lens. Is fixed to the outer periphery of the lens holder, the magnet is disposed on the outer peripheral side of the coil, and a gap lacking a part of the circumferential direction is formed. The lens holder includes an attracting member made of a magnetic material, and is attracted. The member protrudes radially outward and is located in the gap of the magnet, and the attracting member is attracted to either one of the opposite ends of the magnet via the magnet gap, and the attracting member contacts the magnet. It is characterized by that.

請求項３に記載された発明は、レンズを保持するレンズホルダと、コイルと、マグネットと、内側ヨークとを備え、コイルに通電してレンズを光軸方向に移動させるレンズ駆動装置であって、コイルはレンズホルダの外周に固定されており、レンズホルダとコイルとの間には内側ヨークの案内孔が形成されており、マグネットはコイルの外周側に配置され且つ周方向の一部を欠如した隙間が形成されており、レンズホルダは磁性体でできた引き寄せ部材を備え、マグネットの隙間を介して対向するマグネットの両端部の何れか一方に引き寄せ部材が磁力により引き付けられて、案内孔の内周面に内側ヨークが当接することを特徴とする。   The invention described in claim 3 is a lens driving device including a lens holder for holding a lens, a coil, a magnet, and an inner yoke, and energizing the coil to move the lens in the optical axis direction. The coil is fixed to the outer periphery of the lens holder, a guide hole of the inner yoke is formed between the lens holder and the coil, and the magnet is disposed on the outer peripheral side of the coil and lacks a part in the circumferential direction. A gap is formed, and the lens holder includes a drawing member made of a magnetic material, and the drawing member is attracted to one of both end portions of the magnet facing each other through the gap of the magnet by the magnetic force, so that the inside of the guide hole is The inner yoke is in contact with the peripheral surface.

請求項１に記載の発明によれば、レンズホルダは引き寄せ部材がマグネットの隙間を介して対抗するマグネットの両端部の何れか一方に引き付けられて、挿通孔の内周面にシャフトの外周が当接するので、レンズホルダの移動中にレンズホルダとシャフトとの間で一定の摩擦抵抗を得ることができ、レンズホルダが安定した移動速度で移動できる。   According to the first aspect of the present invention, the lens holder is attracted to either end of the magnet that the attracting member opposes through the gap of the magnet, and the outer periphery of the shaft contacts the inner peripheral surface of the insertion hole. Since it contacts, a fixed frictional resistance can be obtained between the lens holder and the shaft during the movement of the lens holder, and the lens holder can move at a stable moving speed.

また、挿通孔とシャフトの外周との当接によりレンズホルダとシャフトとの間で一定の摩擦抵抗を得るので、例えばレンズホルダの外側に板ばねを設ける場合に比べて、スペースを小さくでき、装置の小型化を図ることができる。   Further, since a constant frictional resistance is obtained between the lens holder and the shaft by abutment between the insertion hole and the outer periphery of the shaft, for example, the space can be reduced compared to the case where a leaf spring is provided outside the lens holder, and the device Can be miniaturized.

マグネットの磁力により、引き寄せ部材がマグネットの両端部の何れか一方に引き付けられて、挿通孔の内周面にシャフトの外周が当接して摩擦力が付与されているので、揺れや衝撃に対して、レンズホルダががたつかず、レンズの位置ズレが生じ難い。   The attracting member is attracted to either one of both ends of the magnet by the magnetic force of the magnet, and the outer periphery of the shaft is in contact with the inner peripheral surface of the insertion hole, so that a frictional force is applied. The lens holder does not rattle, and it is difficult for the lens to be displaced.

請求項２に記載された発明によれば、レンズホルダは引き寄せ部材がマグネットの隙間を介して対抗するマグネットの両端部の何れか一方に引き付けられて、引き寄せ部材がマグネットに当接するので、レンズホルダの移動中にレンズホルダとマグネットとの間で一定の摩擦抵抗を得ることができ、レンズホルダが安定した移動速度で移動できる。   According to the second aspect of the present invention, the lens holder is attracted to either one of the opposite ends of the magnet that the attracting member opposes through the gap of the magnet, and the attracting member contacts the magnet. During the movement, a constant frictional resistance can be obtained between the lens holder and the magnet, and the lens holder can move at a stable moving speed.

また、引き寄せ部材とマグネットとの当接により、レンズホルダとマグネットとの間で一定の摩擦抵抗を得るので、例えばレンズホルダの外側に板ばねを設ける場合に比べて、スペースを小さくでき、装置の小型化を図ることができる。   In addition, since a constant frictional resistance is obtained between the lens holder and the magnet by the contact between the attracting member and the magnet, the space can be reduced as compared with the case where a leaf spring is provided outside the lens holder, for example. Miniaturization can be achieved.

マグネットの磁力により、引き寄せ部材がマグネットの両端部の何れか一方に当接して摩擦力が付与されているので、揺れや衝撃に対して、レンズホルダががたつかず、レンズの位置ズレが生じ難い。   Because the magnet's magnetic force causes the attracting member to abut against one of both ends of the magnet to apply a frictional force, the lens holder does not rattle against shaking or shock, and the lens is less likely to be misaligned. .

請求項３に記載された発明によれば、レンズホルダは引き寄せ部材がマグネットの隙間を介して対抗するマグネットの両端部の何れか一方に引き付けられて、案内孔の内周面に内側ヨークが当接するので、レンズホルダの移動中にレンズホルダと内側ヨークとの間で一定の摩擦抵抗を受けることができ、レンズホルダが安定した移動速度で移動できる。   According to the third aspect of the present invention, the lens holder is attracted to either one of the opposite ends of the magnet that the attracting member opposes through the gap of the magnet, and the inner yoke is applied to the inner peripheral surface of the guide hole. Therefore, the lens holder can receive a certain frictional resistance between the lens holder and the inner yoke during the movement of the lens holder, and the lens holder can move at a stable moving speed.

また、内側ヨークと案内孔の内周面との当接により、レンズホルダと内側ヨークとの間で一定の摩擦抵抗を得るので、例えばレンズホルダの外側に板ばねを設ける場合に比べて、スペースを小さくでき、装置の小型化を図ることができる。   In addition, the contact between the inner yoke and the inner peripheral surface of the guide hole provides a constant frictional resistance between the lens holder and the inner yoke, so that, for example, a space is greater than when a leaf spring is provided outside the lens holder. The size of the apparatus can be reduced.

マグネットの磁力により、引き寄せ部材がマグネットの両端部の何れか一方に引き付けられて、案内孔の内周面に内側ヨークが当接して摩擦力が付与されているので、揺れや衝撃に対して、レンズホルダががたつかず、レンズの位置ズレが生じ難い。   The attracting member is attracted to either one of both ends of the magnet by the magnetic force of the magnet, and the inner yoke abuts against the inner peripheral surface of the guide hole to apply a frictional force. The lens holder does not rattle, and it is difficult for the lens to be displaced.

以下に、添付図面を参照して、本発明の実施の形態を詳細に説明する。図１〜図３には、本発明の第１の実施形態が示されている。尚、図１は本実施形態のレンズ駆動装置を示す横断面図、図２は図１のＡ−Ａ断面図、図３は本実施の形態に係るレンズ駆動装置の分解斜視図をそれぞれ示している。   Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 3 show a first embodiment of the present invention. 1 is a cross-sectional view illustrating the lens driving device of the present embodiment, FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, and FIG. 3 is an exploded perspective view of the lens driving device according to the present embodiment. Yes.

本実施形態に係るレンズ駆動装置１は、コイル可動型のレンズ駆動装置であり、レンズ２を保持するレンズホルダ４と、レンズホルダ４に固定された円筒状のコイル１５と、レンズホルダ４の移動を案内する一対のシャフト５、６と、外側ヨーク３と、外側ヨーク３の内周に設けた円筒状のマグネット７と、コイル１５の内周側には横断面円弧状からなる一対の内側ヨーク１１、１３を設けている。   The lens drive device 1 according to the present embodiment is a coil movable type lens drive device. The lens holder 4 that holds the lens 2, the cylindrical coil 15 fixed to the lens holder 4, and the movement of the lens holder 4. A pair of shafts 5 and 6, an outer yoke 3, a cylindrical magnet 7 provided on the inner periphery of the outer yoke 3, and a pair of inner yokes having a circular arc cross section on the inner peripheral side of the coil 15. 11 and 13 are provided.

レンズホルダ４は、その中央に円形状の孔を形成しており、係る孔にレンズ２が保持されている。レンズホルダ４には横断面が円形のシャフト５、６の挿通孔１７、１９が形成されている。尚、シャフト５、６は挿通孔１７、１９に対して遊嵌状態で挿通されている。また、レンズホルダ４はコイル１５の内周との間で円弧状の案内孔２１、２３を形成しており、案内孔２１、２３内で円弧状の内側ヨーク１１、１３を保持している。   The lens holder 4 has a circular hole formed in the center thereof, and the lens 2 is held in the hole. The lens holder 4 is formed with insertion holes 17 and 19 for shafts 5 and 6 having a circular cross section. The shafts 5 and 6 are inserted into the insertion holes 17 and 19 in a loosely fitted state. In addition, the lens holder 4 forms arcuate guide holes 21 and 23 between the inner periphery of the coil 15, and holds the arcuate inner yokes 11 and 13 in the guide holes 21 and 23.

外側ヨーク３は円筒状であり、外側ヨーク３の一端側開口部３ａにはヨーク固定部９が配設されている。ヨーク固定部９は磁性体からなり、内側ヨーク１１、１３の軸方向の一端部が支持される一対の円弧状のスリット９ａ、９ｂと、一対のシャフト５、６の軸方向の一端部を支持する一対の円形の支持孔９ｃ、９ｄと、ヨーク固定部９の中央に形成された円形状の貫通孔９ｅとを有している。尚、外側ヨーク３の他端側開口部３ｂにも、ヨーク固定部１０が配設されており、かかるヨーク固定部１０に、内側ヨーク１１、１３の軸方向の他端部が支持される一対の円弧状のスリット１０ａ、１０ｂと、一対のシャフト５、６の軸方向の他端部を支持する一対の円形の支持孔１０ｃ、１０ｄと、ヨーク固定部１０の中央に形成された円形状の貫通孔１０ｅとを有している。   The outer yoke 3 has a cylindrical shape, and a yoke fixing portion 9 is disposed in one end side opening 3 a of the outer yoke 3. The yoke fixing portion 9 is made of a magnetic material, and supports a pair of arc-shaped slits 9a and 9b in which one end portions of the inner yokes 11 and 13 in the axial direction are supported, and one end portion in the axial direction of the pair of shafts 5 and 6. A pair of circular support holes 9c, 9d and a circular through hole 9e formed in the center of the yoke fixing portion 9. Note that a yoke fixing portion 10 is also provided in the other end side opening 3b of the outer yoke 3, and a pair of axial end portions of the inner yokes 11 and 13 supported by the yoke fixing portion 10 is supported. Arc-shaped slits 10 a and 10 b, a pair of circular support holes 10 c and 10 d for supporting the other axial end of the pair of shafts 5 and 6, and a circular shape formed in the center of the yoke fixing portion 10. And a through hole 10e.

マグネット７は、軸方向の両端部（軸方向の一端部７ｃ、軸方向の他端部７ｄ）がヨーク固定部９、１０に当接している。またマグネット７は、周方向の一部に隙間２５を形成しており、外側ヨーク３の内周面が露出した状態となっている。   The magnet 7 has both end portions in the axial direction (one end portion 7 c in the axial direction and the other end portion 7 d in the axial direction) in contact with the yoke fixing portions 9 and 10. Further, the magnet 7 has a gap 25 formed in a part in the circumferential direction, and the inner peripheral surface of the outer yoke 3 is exposed.

コイル１５は、レンズホルダ４の外周に沿って設けられており、レンズホルダ４に固定されてレンズホルダ４と一体となって、光軸方向に移動するようになっている。コイル１５の外周面には横断面円弧状の磁性体でできた引き寄せ部材２７が固着されており、引き寄せ部材２７は半径方向外側に突出して隙間２５内に位置している。引き寄せ部材２７はマグネット７の隙間２５を介して対抗するマグネット７の両端部の何れか一方の端部７ａ側に引き付けられるようになっている。そして、レンズホルダ４の一方の挿通孔１９の内周面１９ａの一端に一方のシャフト６の外周が当接し、他方の挿通孔１７の内周面１７ａの他端にシャフト５の外周５ａが当接するようになっている。   The coil 15 is provided along the outer periphery of the lens holder 4 and is fixed to the lens holder 4 so as to be integrated with the lens holder 4 and move in the optical axis direction. An attracting member 27 made of a magnetic material having an arc-shaped cross section is fixed to the outer peripheral surface of the coil 15, and the attracting member 27 protrudes radially outward and is located in the gap 25. The attracting member 27 is attracted to one end 7 a side of the opposite ends of the magnet 7 through the gap 25 of the magnet 7. The outer periphery of one shaft 6 abuts one end of the inner peripheral surface 19 a of one insertion hole 19 of the lens holder 4, and the outer periphery 5 a of the shaft 5 contacts the other end of the inner peripheral surface 17 a of the other insertion hole 17. It comes to touch.

次に、本実施の形態に係る作用を説明する。レンズホルダ４は、マグネット７の磁力により引き寄せ部材２７がマグネット７の隙間２５を介して対抗するマグネット７の両端部の何れか一方の端部７ａ側に引き付けられ、挿通孔１７、１９の内周面１７ａ、１９ａにシャフト５、６の外周５ａ、６ａが当接している。そして、コイル１５に電流を流すと、その電流とマグネット７が形成する磁界とにより誘起される電磁力により、レンズホルダ４がシャフト５、６の軸方向に移動する。引き寄せ部材２７がマグネット７の隙間２５を介して対抗するマグネット７の両端部の何れか一方の端部７ａ側に引き付けられ、挿通孔１７、１９の内周面１７ａ、１９ａにシャフト５、６の外周５ａ、６ａが当接するので、レンズホルダ４の移動中にレンズホルダ４とシャフト５、６との間で一定の摩擦抵抗を得ることができ、レンズホルダ４が安定した移動速度で移動できる。   Next, the effect | action which concerns on this Embodiment is demonstrated. The lens holder 4 is attracted to one end 7 a side of both ends of the magnet 7 that the attracting member 27 opposes through the gap 25 of the magnet 7 by the magnetic force of the magnet 7, and the inner periphery of the insertion holes 17 and 19. The outer circumferences 5a and 6a of the shafts 5 and 6 are in contact with the surfaces 17a and 19a. When a current is passed through the coil 15, the lens holder 4 moves in the axial direction of the shafts 5 and 6 by an electromagnetic force induced by the current and the magnetic field formed by the magnet 7. The attracting member 27 is attracted to one end 7a side of both ends of the magnet 7 facing each other through the gap 25 of the magnet 7, and the shafts 5 and 6 are attached to the inner peripheral surfaces 17a and 19a of the insertion holes 17 and 19 respectively. Since the outer circumferences 5a and 6a come into contact with each other, a certain frictional resistance can be obtained between the lens holder 4 and the shafts 5 and 6 during the movement of the lens holder 4, and the lens holder 4 can move at a stable moving speed.

挿通孔１７、１９とシャフト５、６の外周との当接により、レンズホルダ４とシャフト５、６との間で一定の摩擦抵抗を得るので、例えばレンズホルダ４の外側に板ばねを設ける場合に比べて、スペースを小さくでき、装置の小型化を図ることができる。   A constant frictional resistance is obtained between the lens holder 4 and the shafts 5 and 6 by contact between the insertion holes 17 and 19 and the outer circumferences of the shafts 5 and 6, for example, when a leaf spring is provided outside the lens holder 4 Compared to the above, the space can be reduced and the apparatus can be miniaturized.

マグネット７の磁力により引き寄せ部材２７がマグネット７の一方の端部７ａ側に引き付けられ、挿通孔１７、１９の内周面にシャフト５、６の外周が当接して摩擦力が付与されているので、揺れや衝撃に対して、レンズホルダ４ががたつかず、レンズ２の位置ズレも生じ難い。   The attracting member 27 is attracted to the one end 7 a side of the magnet 7 by the magnetic force of the magnet 7, and the outer peripheral surfaces of the shafts 5, 6 are brought into contact with the inner peripheral surfaces of the insertion holes 17, 19 so that a frictional force is applied. The lens holder 4 does not rattle against shaking or impact, and the lens 2 is less likely to be misaligned.

また、マグネット７の周方向の一部分に隙間２５を形成して、この隙間２５に引き寄せ部材２７が位置するようにしたので、マグネット７を外側ヨーク３の内周の全体に渡って設ける場合に比べて、外形を小さくできる。   In addition, since the gap 25 is formed in a part of the circumferential direction of the magnet 7 and the attracting member 27 is positioned in the gap 25, the magnet 7 is provided over the entire inner circumference of the outer yoke 3. The outer shape can be reduced.

次に図４において、本発明の第２実施の形態について説明する。尚、以下の説明において、上述した第１実施の形態と同一の作用効果を奏する部分には同一の符号を付することにより、その部分の詳細な説明を省略し、以下の説明では上述の第１実施の形態と異なる点を主に説明する。   Next, referring to FIG. 4, a second embodiment of the present invention will be described. In the following description, parts having the same functions and effects as those of the first embodiment described above are denoted by the same reference numerals, and detailed description thereof will be omitted. Differences from the first embodiment will be mainly described.

第２の実施形態に係るレンズ駆動装置１は、マグネット７の隙間２５を介して対向するマグネット７の一方の端部７ａ側に引き寄せ部材２７が磁力により引き付けられて、引き寄せ部材２７の周方向の一端部２７ａがマグネット７の一方の端部７ａに当接している点が第１実施の形態と異なる。レンズホルダ４は、引き寄せ部材２７がマグネット７の隙間２５を介して対抗するマグネット７の一端部７ａ側に引き付けられて、引き寄せ部材２７がマグネット７に当接するので、レンズホルダ４の移動中にレンズホルダ４とマグネット７との間で一定の摩擦抵抗を得ることができ、レンズホルダ４が安定した移動速度で移動できる。   In the lens driving device 1 according to the second embodiment, the attracting member 27 is attracted to the one end 7 a side of the magnet 7 facing through the gap 25 of the magnet 7 by the magnetic force. The point which the one end part 27a contact | abuts to the one edge part 7a of the magnet 7 differs from 1st Embodiment. The lens holder 4 is attracted to the one end 7 a side of the magnet 7 that the attracting member 27 opposes through the gap 25 of the magnet 7, and the attracting member 27 contacts the magnet 7, so that the lens holder 4 moves while the lens holder 4 is moving. A constant frictional resistance can be obtained between the holder 4 and the magnet 7, and the lens holder 4 can move at a stable moving speed.

また、引き寄せ部材２７とマグネット７の一端部７ａとの当接により、レンズホルダ４とマグネット７との間で一定の摩擦抵抗を得るので、例えばレンズホルダ４の外側に板ばねを設ける場合に比べて、スペースを小さくでき、装置の小型化を図ることができる。   In addition, since a constant frictional resistance is obtained between the lens holder 4 and the magnet 7 by the contact between the attracting member 27 and the one end portion 7a of the magnet 7, for example, compared to a case where a leaf spring is provided outside the lens holder 4. Thus, the space can be reduced and the apparatus can be miniaturized.

マグネット７の磁力により引き寄せ部材２７がマグネット７の一端部７ａに当接して摩擦力が付与されているので、揺れや衝撃に対して、レンズホルダ４ががたつかず、レンズ２の位置ズレも生じ難い。   Since the attracting member 27 abuts against the one end portion 7a of the magnet 7 due to the magnetic force of the magnet 7 and a frictional force is applied, the lens holder 4 does not rattle and the position of the lens 2 is displaced due to shaking or impact. hard.

次に図５において、第３の実施形態に係るレンズ駆動装置１について説明する。第３の実施形態に係るレンズ駆動装置１は、マグネット７の磁力により引き寄せ部材２７が隙間２５を挟むマグネット７の一方の端部７ａ側に引き付けられて、レンズホルダ４が周方向に移動し、一方の内側ヨーク１１の外周面１１ａの一部分とコイルの内周面１５ａとが当接している。また、一方の内側ヨーク１１とコイルの内周面１５ａとが当接する部分に対向する位置においても、他方の内側ヨーク１３の一部分とコイルの内周面１５ａとが当接している。   Next, referring to FIG. 5, a lens driving device 1 according to a third embodiment will be described. In the lens driving device 1 according to the third embodiment, the attracting member 27 is attracted to the one end 7a side of the magnet 7 sandwiching the gap 25 by the magnetic force of the magnet 7, and the lens holder 4 moves in the circumferential direction. A part of the outer peripheral surface 11a of one inner yoke 11 is in contact with the inner peripheral surface 15a of the coil. Further, even at a position opposite to a portion where one inner yoke 11 and the inner peripheral surface 15a of the coil are in contact, a part of the other inner yoke 13 and the inner peripheral surface 15a of the coil are in contact.

レンズホルダ４は、マグネット７の磁力により引き寄せ部材２７が隙間２５を挟むマグネット７の一方の端部７ａ側に引き付けられ、案内孔２１、２３の内周面に内側ヨーク１１、１３が当接するので、レンズホルダ４の移動中にレンズホルダ４と内側ヨーク１１、１３との間で一定の摩擦抵抗を受けることができ、レンズホルダ４が安定した移動速度で移動できる。   In the lens holder 4, the attracting member 27 is attracted to the one end 7 a side of the magnet 7 sandwiching the gap 25 by the magnetic force of the magnet 7, and the inner yokes 11, 13 abut on the inner peripheral surfaces of the guide holes 21, 23. During the movement of the lens holder 4, a certain frictional resistance can be received between the lens holder 4 and the inner yokes 11 and 13, and the lens holder 4 can move at a stable moving speed.

また、内側ヨーク１１、１３と案内孔２１、２３の内周面との当接により、レンズホルダ４と内側ヨーク１１、１３との間で一定の摩擦抵抗を得るので、例えばレンズホルダ４の外側に板ばねを設ける場合に比べて、スペースを小さくでき、装置の小型化を図ることができる。   In addition, since a certain frictional resistance is obtained between the lens holder 4 and the inner yokes 11 and 13 by contact between the inner yokes 11 and 13 and the inner peripheral surfaces of the guide holes 21 and 23, for example, the outer side of the lens holder 4. Compared with the case where a leaf spring is provided, the space can be reduced and the apparatus can be miniaturized.

マグネット７の磁力により引き寄せ部材２７がマグネット７の一方の端部７ａ側に引き付けられ、案内孔２１、２３の内周面に内側ヨーク１１、１３が当接して摩擦が生じているので、揺れや衝撃に対して、レンズホルダ４ががたつかず、レンズ２の位置ズレも生じ難い。   The attracting member 27 is attracted to the one end 7 a side of the magnet 7 by the magnetic force of the magnet 7, and the inner yokes 11, 13 are brought into contact with the inner peripheral surfaces of the guide holes 21, 23 to generate friction. The lens holder 4 does not rattle against the impact, and the lens 2 is not easily displaced.

尚、本発明は、前述した実施形態に限定されることなく、その要旨を逸脱しない範囲で種々変形して実施できることは言うまでもない。例えば、マグネット７は隙間２５以外の部分は周方向に連続して設けているが、これに限定されず、外側ヨーク３の内周面に引き寄せ部材２７が位置する分だけスペースを開けて、複数のマグネットを間隔を開けて配置しても良い。   Needless to say, the present invention is not limited to the above-described embodiment, and can be variously modified without departing from the scope of the invention. For example, the magnet 7 is continuously provided in the circumferential direction except for the gap 25, but the present invention is not limited to this, and a plurality of spaces are provided by the amount of the attracting member 27 located on the inner circumferential surface of the outer yoke 3. The magnets may be arranged at intervals.

引き寄せ部材２７はマグネットであっても良い。   The attracting member 27 may be a magnet.

本実施形態のレンズ駆動装置を示す横断面図である。It is a cross-sectional view which shows the lens drive device of this embodiment. 図１のＡ−Ａ断面図である。It is AA sectional drawing of FIG. 本実施の形態に係るレンズ駆動装置の分解斜視図である。It is a disassembled perspective view of the lens drive device concerning this embodiment. 第２実施の形態に係るレンズ駆動装置を示す横断面図である。It is a cross-sectional view showing a lens driving device according to a second embodiment. 第３実施の形態に係るレンズ駆動装置を示す横断面図である。It is a cross-sectional view showing a lens driving device according to a third embodiment.

符号の説明Explanation of symbols

１ レンズ駆動装置
２ レンズ
４ レンズホルダ
５、６ シャフト
７ マグネット
１１、１３ 内側ヨーク
１５ コイル
１７、１９ シャフトの挿通孔
２１、２３ 案内孔
２５ 隙間
２７ 引き寄せ部材

DESCRIPTION OF SYMBOLS 1 Lens drive device 2 Lens 4 Lens holder 5, 6 Shaft 7 Magnet 11, 13 Inner yoke 15 Coil 17, 19 Shaft insertion hole 21, 23 Guide hole 25 Gap 27 Pulling member

Claims (3)

レンズを保持するレンズホルダと、レンズホルダの移動を案内するシャフトと、コイルと、マグネットとを備え、コイルに通電してレンズホルダをレンズの光軸方向に移動させるレンズ駆動装置であって、コイルはレンズホルダの外周に固定されており、レンズホルダにはシャフトの挿通孔が形成されており、マグネットはコイルの外周側に配置され且つ周方向の一部を欠如した隙間が形成されており、レンズホルダは磁性体でできた引き寄せ部材を備え、引き寄せ部材は半径方向外側に突出してマグネットの隙間に位置しており、マグネットの隙間を介して対向するマグネットの両端部の何れか一方に引き寄せ部材が磁力により引き付けられて、挿通孔の内周面にシャフトの外周が当接していることを特徴とするレンズ駆動装置。   A lens driving device including a lens holder for holding a lens, a shaft for guiding the movement of the lens holder, a coil, and a magnet, and energizing the coil to move the lens holder in the optical axis direction of the lens. Is fixed to the outer periphery of the lens holder, the lens holder is formed with a shaft insertion hole, the magnet is disposed on the outer peripheral side of the coil and a gap lacking a part in the circumferential direction is formed, The lens holder includes an attracting member made of a magnetic material, and the attracting member protrudes radially outward and is located in the gap of the magnet, and is attracted to either one of the opposite end portions of the magnet through the magnet gap. Is attracted by a magnetic force, and the outer periphery of the shaft is in contact with the inner peripheral surface of the insertion hole. レンズを保持するレンズホルダと、コイルと、マグネットとを備え、コイルに通電してレンズホルダをレンズの光軸方向に移動させるレンズ駆動装置であって、コイルはレンズホルダの外周に固定されており、マグネットはコイルの外周側に配置され且つ周方向の一部を欠如した隙間が形成されており、レンズホルダは磁性体でできた引き寄せ部材を備え、引き寄せ部材は半径方向外側に突出してマグネットの隙間に位置しており、マグネットの隙間を介して対向するマグネットの両端部の何れか一方に引き寄せ部材が磁力により引き付けられて、マグネットに引き寄せ部材が当接することを特徴とするレンズ駆動装置。   A lens driving device including a lens holder for holding a lens, a coil, and a magnet, and energizing the coil to move the lens holder in the optical axis direction of the lens. The coil is fixed to the outer periphery of the lens holder. The magnet is disposed on the outer peripheral side of the coil and has a gap that lacks a part in the circumferential direction. The lens holder includes a pulling member made of a magnetic material, and the pulling member protrudes radially outward to protrude from the magnet. A lens driving device, wherein the attracting member is attracted by a magnetic force to either one of both end portions of the magnet facing each other through the gap of the magnet, and the attracting member contacts the magnet. レンズを保持するレンズホルダと、コイルと、マグネットと、内側ヨークとを備え、コイルに通電してレンズを光軸方向に移動させるレンズ駆動装置であって、コイルはレンズホルダの外周に固定されており、レンズホルダとコイルとの間には内側ヨークの案内孔が形成されており、マグネットはコイルの外周側に配置され且つ周方向の一部を欠如した隙間が形成されており、レンズホルダは磁性体でできた引き寄せ部材を備え、マグネットの隙間を介して対向するマグネットの両端部の何れか一方に引き寄せ部材が磁力により引き付けられて、案内孔の内周面に内側ヨークが当接することを特徴とするレンズ駆動装置。


















A lens driving device including a lens holder for holding a lens, a coil, a magnet, and an inner yoke, and energizing the coil to move the lens in the optical axis direction. The coil is fixed to the outer periphery of the lens holder. The guide hole of the inner yoke is formed between the lens holder and the coil, the magnet is disposed on the outer peripheral side of the coil, and a gap lacking a part in the circumferential direction is formed. A drawing member made of a magnetic material is provided, and the drawing member is attracted by magnetic force to either one of the opposite ends of the magnet through a gap between the magnets so that the inner yoke abuts against the inner peripheral surface of the guide hole. A lens driving device.


















JP2004173623A 2004-06-11 2004-06-11 Lens driving device Pending JP2005352233A (en)

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JP2008129111A (en) * 2006-11-17 2008-06-05 Sanyo Electric Co Ltd Lens driving device and lens driving method
WO2009142149A1 (en) * 2008-05-20 2009-11-26 ミツミ電機株式会社 Lens driving device
WO2010058639A1 (en) * 2008-11-18 2010-05-27 三洋電機株式会社 Lens drive device and camera module having lens drive module mounted therein
WO2011024805A1 (en) * 2009-08-25 2011-03-03 三洋電機株式会社 Lens drive device and camera module with same
JP2016186522A (en) * 2015-03-27 2016-10-27 アルプス電気株式会社 Lens drive device
WO2018062367A1 (en) * 2016-09-30 2018-04-05 日本電産コパル株式会社 Blade driving device
WO2020136802A1 (en) * 2018-12-27 2020-07-02 オリンパス株式会社 Optical device and endoscope

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008129111A (en) * 2006-11-17 2008-06-05 Sanyo Electric Co Ltd Lens driving device and lens driving method
WO2009142149A1 (en) * 2008-05-20 2009-11-26 ミツミ電機株式会社 Lens driving device
WO2010058639A1 (en) * 2008-11-18 2010-05-27 三洋電機株式会社 Lens drive device and camera module having lens drive module mounted therein
WO2011024805A1 (en) * 2009-08-25 2011-03-03 三洋電機株式会社 Lens drive device and camera module with same
JP2016186522A (en) * 2015-03-27 2016-10-27 アルプス電気株式会社 Lens drive device
WO2018062367A1 (en) * 2016-09-30 2018-04-05 日本電産コパル株式会社 Blade driving device
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JPWO2020136802A1 (en) * 2018-12-27 2021-10-21 オリンパス株式会社 Optics and endoscopes
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