JP2000056208A - Camera lens driving device - Google Patents
Camera lens driving deviceInfo
- Publication number
- JP2000056208A JP2000056208A JP21950798A JP21950798A JP2000056208A JP 2000056208 A JP2000056208 A JP 2000056208A JP 21950798 A JP21950798 A JP 21950798A JP 21950798 A JP21950798 A JP 21950798A JP 2000056208 A JP2000056208 A JP 2000056208A
- Authority
- JP
- Japan
- Prior art keywords
- shape memory
- memory alloy
- driving device
- lens
- plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Lens Barrels (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、カメラの小型化に
適した動力部材を備えているカメラ用レンズ駆動装置に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera lens driving device provided with a power member suitable for downsizing a camera.
【０００２】[0002]
【従来の技術】最近は、カメラの小型化と電動化に対す
る要請が一段と大きくなり、それに答えるべく種々の提
案が行われ且つ実施されている。その内、電動化に関し
ては、フィルムの巻き上げ作動をモータによって自動的
に行う様になった他、レンズもパルスモータやＤＣモー
タを用いて駆動し、焦点調節を自動的に行う様になって
きた。2. Description of the Related Art Recently, demands for downsizing and motorization of cameras have been further increased, and various proposals have been made and implemented to respond to the demands. Among them, regarding motorization, the film winding operation has been automatically performed by a motor, and the lens has also been driven by using a pulse motor or a DC motor to automatically perform focus adjustment. .
【０００３】[0003]
【発明が解決しようとする課題】他方、小型化に対する
要求も極めて強く、特にアドバンストフォトシステムフ
ィルムの出現によって一段と拍車がかかってきた。しか
しながら、上記の様にしてレンズの自動焦点調節を電動
化すると、必然的にカメラが大型化してしまい、小型化
の要請には逆行することになる。即ち、レンズの自動焦
点調節にはパルスモータやＤＣモータを用いるのが普通
であるが、これらの部品は、例え小さいものであっても
カメラ部品としてはかなり大きく、又立体的な形状をし
ていることから他の部品と共にコンパクトに収納するこ
とが非常に難しい。又、パルスモータやＤＣモータを用
いた駆動方式だと、構成上連結ギヤなどが必要になる為
小型化に反すると共に部品点数が多くなる為カメラの価
格が高くなるという不都合があった。On the other hand, there is an extremely strong demand for miniaturization, especially with the advent of the advanced photo system film. However, if the automatic focusing of the lens is motorized as described above, the size of the camera is inevitably increased, which goes against the demand for downsizing. That is, a pulse motor or a DC motor is usually used for automatic focusing of a lens, but these parts are considerably large as camera parts even if they are small, and they have a three-dimensional shape. It is very difficult to store compactly with other parts. In addition, a drive system using a pulse motor or a DC motor disadvantageously requires a connecting gear due to its configuration, which is contrary to miniaturization and increases the number of parts, thereby increasing the price of the camera.
【０００４】[0004]
【課題を解決する為の手段】本発明は、上述した課題を
解決する為に成されたものであり、その目的とするとこ
ろは、ＤＣモータやパルスモータを用いることなく、形
状記憶合金を動力源として、レンズの駆動を行う様にし
た、小型化及び電動化に最適なカメラ用レンズ駆動装置
を提供することである。この目的を達成する為に、本発
明に係るカメラ用レンズ駆動装置は、基本的に、開口を
有する地板と、該開口の中心を通る光軸に沿って駆動可
能に該地板の上に配されたレンズ部と、通電に応じて該
レンズ部を駆動する動力部材とから構成されている。特
徴事項として、前記動力部材は、通電により変形して該
レンズ部に作用する形状記憶合金からなる。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to use a shape memory alloy as a power source without using a DC motor or a pulse motor. An object of the present invention is to provide a lens driving device for a camera which drives a lens and is optimal for miniaturization and motorization as a source. In order to achieve this object, a camera lens driving device according to the present invention basically includes a base plate having an opening, and is disposed on the base plate so as to be drivable along an optical axis passing through the center of the opening. And a power member for driving the lens unit in response to energization. As a characteristic feature, the power member is made of a shape memory alloy that is deformed by energization and acts on the lens portion.
【０００５】好ましくは、前記動力部材は、形状記憶合
金の板材からなり通電により変形して該レンズ部を駆動
する。前記形状記憶合金の板材は、一端が該地板に架か
り他端が該レンズ部に係合している。前記形状記憶合金
の板材は、該地板のほぼ中央に形成された該開口の内周
縁と該地板の外周縁とで挟まれた平面領域に配置されて
いる。前記形状記憶合金の板材は、該平面領域に対して
平行に配されており、変形に応じて該板材の他端が該平
面領域と垂直に変位して該レンズ部を駆動する。前記形
状記憶合金の板材は、ほぼ円形の該開口の内周縁とほぼ
円盤状の該地板の外周縁とで挟まれた環状の平面領域に
合った形状を有する。好ましくは、前記形状記憶合金の
板材は、通電により変形を起こす一方の形状記憶合金片
と、通電により変形を起こす他方の形状記憶合金片と、
互いに貼り合わされた両方の形状記憶合金片の間に介在
する中間絶縁層とを含み、各形状記憶合金片に対する通
電の切り替えに応じ双方向に変形する。好ましくは、前
記レンズ部は該光軸に沿って一方向に付勢されていると
共に、前記動力部材は該光軸に沿って他方向に該レンズ
部を駆動する。[0005] Preferably, the power member is made of a plate material of a shape memory alloy and is deformed by energization to drive the lens portion. One end of the plate material of the shape memory alloy is connected to the base plate and the other end is engaged with the lens portion. The plate material of the shape memory alloy is disposed in a plane region sandwiched between an inner peripheral edge of the opening formed substantially at the center of the base plate and an outer peripheral edge of the base plate. The plate member of the shape memory alloy is arranged in parallel with the plane region, and the other end of the plate member is displaced perpendicular to the plane region in response to deformation to drive the lens unit. The plate material of the shape memory alloy has a shape conforming to an annular plane region sandwiched between an inner peripheral edge of the substantially circular opening and an outer peripheral edge of the substantially disk-shaped base plate. Preferably, the plate material of the shape memory alloy, one shape memory alloy piece deformed by energization, and the other shape memory alloy piece deformed by energization,
An intermediate insulating layer interposed between the two shape memory alloy pieces bonded to each other, and deformed bidirectionally in response to switching of energization to each shape memory alloy piece. Preferably, the lens unit is urged in one direction along the optical axis, and the power member drives the lens unit in the other direction along the optical axis.
【０００６】本発明によれば、形状記憶合金の板材から
なる動力部材が地板に組み込まれる。この形状記憶合金
板材に通電すると自己発熱して変形し、レンズ部に作用
して自動焦点調節を行う。形状記憶合金の板材は偏平形
状を有し、地板に極めてコンパクトに実装できる。According to the present invention, a power member made of a sheet material of a shape memory alloy is incorporated in a main plate. When the shape memory alloy plate is energized, it self-heats and deforms, acting on the lens portion to perform automatic focus adjustment. The shape memory alloy plate has a flat shape and can be mounted extremely compactly on the main plate.
【０００７】[0007]
【発明の実施の形態】以下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は本発明に係るカメラ用
レンズ駆動装置の全体構成を示す模式的な斜視図であ
る。図示する様に、本カメラ用レンズ駆動装置は基本的
に、地板１とレンズ部２と動力部材４とを備えている。
地板１はそのほぼ中央部に開口１１が形成されている。
レンズ部２は開口１１の中心を通る光軸に沿って駆動可
能に地板１の上に配されている。なお、図示しないが地
板１にはレンズ部２に加えシャッタ部なども組み込まれ
ている。動力部材４は通電に応じてレンズ部２を駆動
し、撮影に先立って被写体に対する自動焦点調節を行
う。特徴事項として、動力部材４は通電による自己発熱
で変形してレンズ部２に作用する形状記憶合金からな
る。具体的には、動力部材４は形状記憶合金の板材から
なり通電に応じて反り変形してレンズ部２を駆動する。
図示する様に、形状記憶合金の板材は、一端が保持部材
３により地板１に係止され、他端がレンズ部２に係合し
ている。レンズ部２は鏡胴２１とレンズ２２とからな
る。鏡胴２１の側面には作動ピン２３が取り付けられて
いる。形状記憶合金の板材からなる動力部材４の自由端
はこの作動ピン２３と係合している。鏡胴２１の側面か
ら直径方向に一対の突起２４が形成されている。地板１
には一対の案内柱１２が植設されており、鏡胴２１は一
対の突起２４を介して一対の案内柱１２に係合してい
る。なお、各案内柱12には、バネ６が装着され、さらに
押え板が係合する。Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic perspective view showing the entire configuration of a camera lens driving device according to the present invention. As shown in the figure, the camera lens driving device basically includes a base plate 1, a lens unit 2, and a power member 4.
The base plate 1 has an opening 11 formed at a substantially central portion thereof.
The lens unit 2 is disposed on the main plate 1 so as to be drivable along an optical axis passing through the center of the opening 11. Although not shown, a shutter unit and the like are incorporated in the base plate 1 in addition to the lens unit 2. The power member 4 drives the lens unit 2 in accordance with the energization, and performs automatic focus adjustment on the subject prior to photographing. As a characteristic feature, the power member 4 is made of a shape memory alloy which is deformed by self-heating by energization and acts on the lens portion 2. Specifically, the power member 4 is made of a plate material of a shape memory alloy, and warps and deforms in response to energization to drive the lens unit 2.
As shown in the figure, the shape memory alloy plate has one end locked to the base plate 1 by the holding member 3 and the other end engaged with the lens portion 2. The lens unit 2 includes a lens barrel 21 and a lens 22. An operation pin 23 is attached to a side surface of the lens barrel 21. The free end of the power member 4 made of a shape memory alloy plate is engaged with the operating pin 23. A pair of protrusions 24 are formed in the diameter direction from the side surface of the lens barrel 21. Ground plate 1
, A pair of guide columns 12 is implanted, and the lens barrel 21 is engaged with the pair of guide columns 12 via a pair of protrusions 24. A spring 6 is mounted on each guide post 12, and a pressing plate is further engaged.
【０００８】形状記憶合金の板材からなる動力部材４
は、地板１のほぼ中央に形成された開口１１の内周縁と
地板１の外周縁とで挟まれた平面領域に配置されてい
る。形状記憶合金の板材は、この平面領域に対して平行
に配されており、反り変形に応じて板材の自由端が平面
領域と垂直に変位して作動ピン２３に作用し、レンズ部
２を駆動する。通電により動力部材４の自由端が上方に
反り変形すると、レンズ部２は一対の案内柱１２に案内
されながら垂直上方向に変位する。動力部材４に供給す
る通電量を被写体距離情報に応じて制御することによ
り、レンズ部２の移動距離を調節し、所望の自動焦点調
節を実行する。形状記憶合金の板材は、ほぼ円形の開口
１１の内周縁とほぼ円盤状の地板１の外周縁とで挟まれ
た環状の平面領域に合った形状を有する。図示の例では
形状記憶合金の板材は円弧形状となっている。但し、本
発明はこれに限られるものではなく環形状としてもよ
い。形状記憶合金の板材の面積が大きくなる程、より多
くの駆動力が得られる。Power member 4 made of a sheet material of shape memory alloy
Are arranged in a plane region sandwiched between an inner peripheral edge of an opening 11 formed substantially at the center of the main plate 1 and an outer peripheral edge of the main plate 1. The plate material of the shape memory alloy is arranged in parallel to this plane region, and the free end of the plate material is displaced perpendicularly to the plane region in response to the warp deformation and acts on the operating pin 23 to drive the lens unit 2. I do. When the free end of the power member 4 is deformed upward by current flow, the lens portion 2 is displaced vertically upward while being guided by the pair of guide columns 12. By controlling the amount of current supplied to the power member 4 according to the subject distance information, the moving distance of the lens unit 2 is adjusted, and desired automatic focus adjustment is performed. The shape memory alloy plate material has a shape conforming to an annular plane area sandwiched between the inner peripheral edge of the substantially circular opening 11 and the outer peripheral edge of the substantially disk-shaped base plate 1. In the illustrated example, the plate material of the shape memory alloy has an arc shape. However, the present invention is not limited to this, and may have a ring shape. As the area of the shape memory alloy plate increases, more driving force can be obtained.
【０００９】ある種の金属に、塑性変形の様な大きな変
形を与えても、加熱すると変形前の形を記憶している様
に、形状を回復する現象を形状記憶効果と呼び、この様
な性質を持つ金属を形状記憶合金と言う。形状記憶効果
は、熱弾性型マルテンサイトと呼ばれる金属の固相変態
に伴う現象である。この固相変態では、限られた範囲内
ではあるが、熱エネルギーと弾性エネルギーの交換が可
能である。気体を閉じ込めたシリンダに似た振る舞いか
ら形状記憶合金は、固体状態のスターリングエンジンの
様な動力部材（アクチュエータ）と考えることができ
る。アクチュエータとして実際に利用できるのは、多結
晶体で使用できること、回復歪量、疲労特性、使用温度
域、安全性、耐久性などの理由から、Ｔｉ−Ｎｉ系とＣ
ｕ−Ｚｎ−Ａｌ系の形状記憶合金が挙げられる。特に、
Ｔｉ−Ｎｉ系の形状記憶合金の板材は、金属として比較
的大きな電気抵抗を持ち、通電で容易に加熱できる。こ
のことは、形状記憶合金板材に電線をつなぐだけで運動
を取り出せるアクチュエータを作れることを示す。形状
や形がシンプルなことは、マイクロアクチュエータに取
って有利なことである。形状記憶合金の板材は電気的に
ほぼ抵抗成分と見なせ、通電電流は、交流でも直流でも
パルスでも構わない。板状の形状記憶合金は形も単純で
通電時に電流密度や応力が均一で電流や力の計算がやり
易く、温度分布も均一になり易い為通電加熱に適してい
る。形状記憶合金の板材は通電加熱で収縮により反り変
形し、冷却で弛緩伸長する電流駆動型の素子と言える。Even when a certain kind of metal is subjected to a large deformation such as plastic deformation, a phenomenon of recovering the shape as if the shape before deformation is remembered when heated is called a shape memory effect. A metal having properties is called a shape memory alloy. The shape memory effect is a phenomenon associated with solid-state transformation of a metal called thermoelastic martensite. In this solid state transformation, it is possible to exchange heat energy and elastic energy within a limited range. The shape memory alloy can be considered as a power member (actuator) such as a solid-state Stirling engine because of its behavior similar to a gas-confined cylinder. Actuators that can be actually used as Ti-Ni-based and C-based actuators can be used because of their ability to be used in polycrystalline form, the amount of recovery strain, fatigue characteristics, operating temperature range, safety, and durability.
A u-Zn-Al-based shape memory alloy may be used. In particular,
The plate material of the Ti-Ni-based shape memory alloy has a relatively large electric resistance as a metal and can be easily heated by energization. This indicates that it is possible to make an actuator capable of extracting motion simply by connecting an electric wire to the shape memory alloy plate. The simplicity of the shape and shape is advantageous for a microactuator. The plate material of the shape memory alloy can be considered to be electrically almost a resistance component, and the energizing current may be AC, DC or pulse. The plate-shaped shape memory alloy has a simple shape, has a uniform current density and stress during energization, facilitates calculation of current and force, and has a uniform temperature distribution, and thus is suitable for energization heating. It can be said that the sheet material of the shape memory alloy is a current-driven type element that warps and deforms due to contraction by heating and relaxes and expands by cooling.
【００１０】図２は、本発明に係るカメラ用レンズ駆動
装置の模式的な平面図である。図示する様に円盤状の地
板１のほぼ中央に開口１１が形成されている。地板１に
は一対の案内柱１２が植設されている。地板１の開口１
１に整合してレンズ部２が搭載されている。レンズ部２
は鏡胴２１とその内部に組み込まれたレンズ２２とから
なる。鏡胴２１の外周面から直径方向に一対の突起２４
が形成されている。各突起２４には案内穴が形成されて
おり、対応する案内柱１２が挿通する様になっている。
鏡胴２１の側面から作動ピン２３も径方向外側に突出し
ている。地板１の周方向に沿って円弧状の形状記憶合金
の板材からなる動力部材４が配されている。動力部材４
の一端は保持部材３により地板１に係止されていると共
に、他端はレンズ部２の作動ピン２３と係合している。
本例では動力部材４は円弧状であるが、これに代えて環
形状の形状記憶合金の板材を用いてもよい。なお、地板
１に植設された一対の案内柱１２には、レンズ部２を光
軸の一方向に沿って付勢する様に、バネ６が装着されて
いる。FIG. 2 is a schematic plan view of a camera lens driving device according to the present invention. As shown in the figure, an opening 11 is formed at substantially the center of the disc-shaped base plate 1. A pair of guide columns 12 are planted on the main plate 1. Opening 1 of main plate 1
1, a lens unit 2 is mounted. Lens part 2
Consists of a lens barrel 21 and a lens 22 incorporated therein. A pair of protrusions 24 are arranged in the diameter direction
Are formed. A guide hole is formed in each protrusion 24 so that the corresponding guide column 12 is inserted therethrough.
The operating pin 23 also projects radially outward from the side surface of the lens barrel 21. A power member 4 made of an arcuate shape memory alloy plate is arranged along the circumferential direction of the main plate 1. Power member 4
Has one end locked to the base plate 1 by the holding member 3 and the other end engaged with the operating pin 23 of the lens unit 2.
In this example, the power member 4 has an arc shape, but an annular shape memory alloy plate may be used instead. Note that a spring 6 is mounted on the pair of guide columns 12 implanted on the main plate 1 so as to bias the lens unit 2 along one direction of the optical axis.
【００１１】図３は、図２に示したカメラ用レンズ駆動
装置のIII−III線に沿った模式的な断面図である。図示
する様に、形状記憶合金の板材からなる動力部材４が保
持部材３により地板１に組み付けられている。レンズ部
２は鏡胴２１とレンズ２２とから構成されており、開口
１１と整合して配されている。鏡胴２１から径方向に突
出した作動ピン２３に、形状記憶合金の板材からなる動
力部材４の自由端が係合している。レンズ部２は地板１
に植設された案内柱１２に案内されつつ、開口１１の中
心線と一致する光軸に沿って双方向に移動可能である。
実際には、レンズ部２の鏡胴２１の側面から延設された
突起２４が案内柱１２に係合している。地板１の上方に
は押さえ板７が配されており、レンズ部２は地板１と押
さえ板７の間に組み込まれる様になっている。バネ６が
案内柱１２に装着されている。バネ６の一端は押さえ板
７に当接し、他端は鏡胴２１の突起２４に当接してい
る。バネ６はレンズ部２を下方向に付勢している。動力
部材４はバネ６の付勢力に抗してレンズ部２を上方向に
駆動する。形状記憶合金の板材からなる動力部材４に通
電を開始すると、自己発熱し反り変形を生じる。動力部
材４の自由端が反り変形により光軸上方向に変位し、作
動ピン２３を介してレンズ部２を光軸上方向に駆動し、
所望の自動焦点調節を行う。撮影が終わった段階で動力
部材４に対する通電がオフになり、冷却過程に移って反
り変形が消滅する。これにより、レンズ部２はバネ６の
付勢力により初期位置に復帰する。FIG. 3 is a schematic sectional view taken along the line III-III of the camera lens driving device shown in FIG. As shown in the figure, a power member 4 made of a plate material of a shape memory alloy is assembled to a main plate 1 by a holding member 3. The lens unit 2 includes a lens barrel 21 and a lens 22, and is arranged in alignment with the opening 11. A free end of a power member 4 made of a shape memory alloy plate is engaged with an operating pin 23 that projects radially from the lens barrel 21. The lens part 2 is the main plate 1
While being guided by the guide column 12 implanted in the opening 11, it can move bidirectionally along the optical axis coincident with the center line of the opening 11.
Actually, a projection 24 extending from the side surface of the lens barrel 21 of the lens unit 2 is engaged with the guide column 12. A holding plate 7 is arranged above the main plate 1, and the lens unit 2 is incorporated between the main plate 1 and the holding plate 7. A spring 6 is mounted on the guide post 12. One end of the spring 6 is in contact with the holding plate 7, and the other end is in contact with the projection 24 of the lens barrel 21. The spring 6 urges the lens unit 2 downward. The power member 4 drives the lens unit 2 upward against the urging force of the spring 6. When energization of the power member 4 made of a shape memory alloy plate is started, the power member 4 generates heat and warps. The free end of the power member 4 is displaced in the upward direction of the optical axis due to the warp deformation, and drives the lens unit 2 in the upward direction of the optical axis via the operating pin 23.
Perform the desired automatic focus adjustment. At the stage when the photographing is completed, the power supply to the power member 4 is turned off, and the process proceeds to the cooling process to eliminate the warpage deformation. Thereby, the lens unit 2 returns to the initial position by the urging force of the spring 6.
【００１２】図３に示した動力部材４は、通電加熱によ
り反り変形すると共に、通電を遮断した後の自然冷却に
より自己復帰する。しかしながら通電による加熱過程に
比べ自然放熱による冷却過程は時間がかかるので、応答
性に難点がある。図３に示した実施例では、初期状態へ
の復帰を補助する為にバネ６が用いられている。更に応
答性を高める為、通電により双方向に反り変形可能な形
状記憶合金の板材を動力部材４に用いることも可能であ
り、その例を図４に示す。（Ａ）に示す様に、形状記憶
合金板材４０は、通電に応じて発熱し反り変形を起こす
一方の形状記憶合金片４１と、通電に応じて発熱し反り
変形を起こす他方の形状記憶合金片４２と、互いに貼り
合わされた両方の形状記憶合金片４１，４２の間に介在
する中間絶縁層４３とを含み、各形状記憶合金片に対す
る通電の切り替えに応じ双方向に反り変形する。（Ａ）
は、何れの形状記憶合金片４１，４２も通電されていな
い状態を表わしてある。この時、形状記憶合金の積層板
材４０は初期状態であり、偏平形状となっている。
（Ｂ）は、一方の形状記憶合金片４１に通電した時の変
形状態を表わしている。形状記憶合金の板材４０は一方
向に反り変形する。（Ｃ）は、形状記憶合金片４１への
通電を遮断すると共に、他方の形状記憶合金片４２への
通電を開始した状態を表わしている。一方の形状記憶合
金片４１は通電を遮断することで冷却過程に入り、初期
状態に復帰していく。この時、他方の形状記憶合金片４
２が発熱過程に入る為、他方向に反り変形する。形状記
憶合金片４１の冷却過程における反り変形の復帰方向と
他方の形状記憶合金片４２の発熱過程における反り変形
の方向が一致する為、形状記憶合金の板材４０は全体と
して速やかに初期状態に復帰し、応答速度が改善でき
る。The power member 4 shown in FIG. 3 is warped and deformed by energized heating and self-recovers by natural cooling after the energization is cut off. However, since the cooling process by natural heat dissipation takes longer time than the heating process by energization, there is a problem in response. In the embodiment shown in FIG. 3, a spring 6 is used to assist in returning to the initial state. In order to further enhance the responsiveness, a plate member of a shape memory alloy that can be deformed in both directions by energization can be used for the power member 4, and an example is shown in FIG. As shown in (A), the shape memory alloy plate material 40 has one shape memory alloy piece 41 that generates heat and undergoes warp deformation when energized, and the other shape memory alloy piece that generates heat and undergoes warp deformation when energized. 42, and an intermediate insulating layer 43 interposed between the two shape memory alloy pieces 41, 42 bonded to each other, and deforms bidirectionally in response to switching of energization to each shape memory alloy piece. (A)
Represents a state in which none of the shape memory alloy pieces 41 and 42 are energized. At this time, the laminate 40 of the shape memory alloy is in an initial state and has a flat shape.
(B) shows a deformed state when one of the shape memory alloy pieces 41 is energized. The plate member 40 of the shape memory alloy is warped and deformed in one direction. (C) shows a state in which the energization of the shape memory alloy piece 41 is interrupted and the energization of the other shape memory alloy piece 42 is started. The shape memory alloy piece 41 enters a cooling process by cutting off the current, and returns to the initial state. At this time, the other shape memory alloy piece 4
Since 2 enters a heating process, it is warped in the other direction. Since the direction of return of the warp deformation in the cooling process of the shape memory alloy piece 41 and the direction of the warp deformation in the heat generation process of the other shape memory alloy piece 42 match, the plate material 40 of the shape memory alloy quickly returns to the initial state as a whole. And the response speed can be improved.
【００１３】[0013]
【発明の効果】以上説明したように、本発明によれば、
開口部を有する地板と、光軸に沿って駆動可能に地板の
上に配されたレンズ部と、通電に応じてレンズ部を駆動
する動力部材とからなるカメラ用レンズ駆動装置におい
て、動力部材は通電による自己発熱で変形してレンズ部
に作用する形状記憶合金からなる。係る構成により、非
常に薄型及び小型化で部品点数も極めて少なく低価格で
設計の自由度の極めて高いカメラ用レンズ駆動装置を実
現できる。As described above, according to the present invention,
In a camera lens driving device including a ground plate having an opening, a lens portion disposed on the ground plate so as to be drivable along the optical axis, and a power member for driving the lens portion in accordance with energization, the power member is It is made of a shape memory alloy that is deformed by self-heating due to energization and acts on the lens portion. With such a configuration, it is possible to realize a camera lens driving device that is extremely thin and small, has a very small number of parts, is inexpensive, and has a very high degree of freedom in design.
【図１】本発明に係るカメラ用レンズ駆動装置を示す模
式的な斜視図である。FIG. 1 is a schematic perspective view showing a camera lens driving device according to the present invention.
【図２】本発明に係るカメラ用レンズ駆動装置を示す平
面図である。FIG. 2 is a plan view showing a camera lens driving device according to the present invention.
【図３】本発明に係るカメラ用レンズ駆動装置を示す模
式的な断面図である。FIG. 3 is a schematic sectional view showing a camera lens driving device according to the present invention.
【図４】本発明に係るカメラ用レンズ駆動装置に組み込
まれる形状記憶合金の板材の実施例を示す模式図であ
る。FIG. 4 is a schematic view illustrating an embodiment of a shape memory alloy plate material incorporated in the camera lens driving device according to the present invention.
１・・・地板、２・・・レンズ部、３・・・保持部材、
４・・・動力部材、６・・・バネ、７・・・押さえ板、
１１・・・開口、１２・・・案内柱、２１・・・鏡胴、
２２・・・レンズ、２３・・・作動ピン、２４・・・突
起、４０・・・形状記憶合金の板材DESCRIPTION OF SYMBOLS 1 ... Ground plate, 2 ... Lens part, 3 ... Holding member,
4 ... power member, 6 ... spring, 7 ... holding plate,
11 ... opening, 12 ... guide pillar, 21 ... lens barrel,
Reference numeral 22: lens, 23: operating pin, 24: projection, 40: plate material of shape memory alloy
Claims (8)
る光軸に沿って駆動可能に該地板の上に配されたレンズ
部と、通電に応じて該レンズ部を駆動する動力部材とか
らなるカメラ用レンズ駆動装置において、 前記動力部材は、通電により変形して該レンズ部に作用
する形状記憶合金からなることを特徴とするカメラ用レ
ンズ駆動装置。1. A base plate having an opening, a lens portion disposed on the base plate so as to be drivable along an optical axis passing through the center of the opening, and a power member for driving the lens portion in response to energization. The lens drive device for a camera according to claim 1, wherein the power member is made of a shape memory alloy that is deformed by energization and acts on the lens portion.
らなり通電により変形して該レンズ部を駆動することを
特徴とする請求項１記載のカメラ用レンズ駆動装置。2. The camera lens driving device according to claim 1, wherein the power member is made of a plate material of a shape memory alloy and is deformed by energization to drive the lens unit.
板に架かり他端が該レンズ部に係合することを特徴とす
る請求項２記載のカメラ用レンズ駆動装置。3. The lens driving device for a camera according to claim 2, wherein one end of the plate member of the shape memory alloy is connected to the base plate and the other end is engaged with the lens portion.
ぼ中央に形成された該開口の内周縁と該地板の外周縁と
で挟まれた平面領域に配置されていることを特徴とする
請求項３記載のカメラ用レンズ駆動装置。4. The plate material of the shape memory alloy is arranged in a plane area sandwiched between an inner peripheral edge of the opening formed substantially at the center of the base plate and an outer peripheral edge of the base plate. The camera lens driving device according to claim 3.
に対して平行に配されており、変形に応じて該板材の他
端が該平面領域と垂直に変位して該レンズ部を駆動する
ことを特徴とする請求項４記載のカメラ用レンズ駆動装
置。5. The plate member of the shape memory alloy is disposed parallel to the plane region, and the other end of the plate member is displaced perpendicular to the plane region in response to deformation to drive the lens unit. 5. The camera lens driving device according to claim 4, wherein:
該開口の内周縁とほぼ円盤状の該地板の外周縁とで挟ま
れた環状の平面領域に合った形状を有することを特徴と
する請求項５記載のカメラ用レンズ駆動装置。6. The shape memory alloy plate material has a shape conforming to an annular plane region sandwiched between an inner peripheral edge of the substantially circular opening and an outer peripheral edge of the substantially disk-shaped base plate. The camera lens driving device according to claim 5.
変形を起こす一方の形状記憶合金片と、通電により変形
を起こす他方の形状記憶合金片と、互いに貼り合わされ
た両方の形状記憶合金片の間に介在する中間絶縁層とを
含み、各形状記憶合金片に対する通電の切り替えに応じ
双方向に変形することを特徴とする請求項２記載のカメ
ラ用レンズ駆動装置。7. The shape memory alloy plate material includes a shape memory alloy piece that deforms when energized, another shape memory alloy piece that deforms when energized, and both shape memory alloy pieces bonded to each other. 3. The camera lens driving device according to claim 2, further comprising an intermediate insulating layer interposed therebetween, wherein the lens driving device is bidirectionally deformed in accordance with switching of energization to each shape memory alloy piece.
付勢されていると共に、前記動力部材は該光軸に沿って
他方向に該レンズ部を駆動することを特徴とする請求項
１記載のカメラ用レンズ駆動装置。8. The apparatus according to claim 1, wherein the lens unit is urged in one direction along the optical axis, and the power member drives the lens unit in another direction along the optical axis. Item 2. A camera lens driving device according to Item 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21950798A JP2000056208A (en) | 1998-08-04 | 1998-08-04 | Camera lens driving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21950798A JP2000056208A (en) | 1998-08-04 | 1998-08-04 | Camera lens driving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000056208A true JP2000056208A (en) | 2000-02-25 |
Family
ID=16736550
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21950798A Pending JP2000056208A (en) | 1998-08-04 | 1998-08-04 | Camera lens driving device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000056208A (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002090655A (en) * | 2000-09-12 | 2002-03-27 | Olympus Optical Co Ltd | Intermediate lens barrel |
| JP2002130114A (en) * | 2000-10-20 | 2002-05-09 | Toshiba Corp | Actuator device |
| EP1251381A2 (en) * | 2001-04-20 | 2002-10-23 | Conti Temic microelectronic GmbH | Adjusting element, especially a component of an adjustment device of an image pickup system |
| WO2005001539A1 (en) * | 2003-06-27 | 2005-01-06 | Nokia Corporation | Camera lens-positioning device using shape memory alloy and camera using the device |
| KR100703201B1 (en) | 2005-10-24 | 2007-04-06 | 삼성전기주식회사 | Device for lens transfer |
| KR100748243B1 (en) * | 2005-11-17 | 2007-08-09 | 삼성전기주식회사 | Lens driving device and camera module |
| JP2007333792A (en) * | 2006-06-12 | 2007-12-27 | Fujifilm Corp | Lens-driving apparatus |
| WO2008117958A1 (en) * | 2007-03-27 | 2008-10-02 | Hyoung-Chan Kim | Auto focus camera module |
| KR100867530B1 (en) * | 2007-01-03 | 2008-11-06 | 삼성전기주식회사 | Auto focusing camera module |
| US7561202B2 (en) | 2003-08-21 | 2009-07-14 | Konica Minolta Opto, Inc. | Image device with lens adjustment for various environmental conditions |
| JP2009251373A (en) * | 2008-04-08 | 2009-10-29 | Konica Minolta Holdings Inc | Driving device |
| TWI459069B (en) * | 2011-11-04 | 2014-11-01 | Altek Corp | Camera lens with improved focus accuracy and image pickup device using the same |
| KR101460263B1 (en) | 2013-01-23 | 2014-11-10 | (주)옵티스 | Camera module |
| CN108445599A (en) * | 2018-03-27 | 2018-08-24 | 瑞声科技(新加坡)有限公司 | Lens driving apparatus |
| JP2021043319A (en) * | 2019-09-11 | 2021-03-18 | 新思考電機有限公司 | Lens drive device, camera device and electronic equipment |
-
1998
- 1998-08-04 JP JP21950798A patent/JP2000056208A/en active Pending
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002090655A (en) * | 2000-09-12 | 2002-03-27 | Olympus Optical Co Ltd | Intermediate lens barrel |
| JP4663084B2 (en) * | 2000-09-12 | 2011-03-30 | オリンパス株式会社 | Intermediate tube |
| JP2002130114A (en) * | 2000-10-20 | 2002-05-09 | Toshiba Corp | Actuator device |
| EP1251381A2 (en) * | 2001-04-20 | 2002-10-23 | Conti Temic microelectronic GmbH | Adjusting element, especially a component of an adjustment device of an image pickup system |
| EP1251381A3 (en) * | 2001-04-20 | 2004-01-14 | Conti Temic microelectronic GmbH | Adjusting element, especially a component of an adjustment device of an image pickup system |
| WO2005001540A1 (en) * | 2003-06-27 | 2005-01-06 | Nokia Corporation | Camera lens-positioning device using shape memory alloy and camera using the same |
| US7177539B2 (en) | 2003-06-27 | 2007-02-13 | Nokia Corporation | Camera lens positioning device using shape memory alloy and camera using the positioning device |
| CN100359355C (en) * | 2003-06-27 | 2008-01-02 | 诺基亚公司 | Camera lens-positioning device using shape memory alloy and camera using the same |
| WO2005001539A1 (en) * | 2003-06-27 | 2005-01-06 | Nokia Corporation | Camera lens-positioning device using shape memory alloy and camera using the device |
| US7561202B2 (en) | 2003-08-21 | 2009-07-14 | Konica Minolta Opto, Inc. | Image device with lens adjustment for various environmental conditions |
| KR100703201B1 (en) | 2005-10-24 | 2007-04-06 | 삼성전기주식회사 | Device for lens transfer |
| KR100748243B1 (en) * | 2005-11-17 | 2007-08-09 | 삼성전기주식회사 | Lens driving device and camera module |
| JP2007333792A (en) * | 2006-06-12 | 2007-12-27 | Fujifilm Corp | Lens-driving apparatus |
| KR100867530B1 (en) * | 2007-01-03 | 2008-11-06 | 삼성전기주식회사 | Auto focusing camera module |
| WO2008117958A1 (en) * | 2007-03-27 | 2008-10-02 | Hyoung-Chan Kim | Auto focus camera module |
| JP2009251373A (en) * | 2008-04-08 | 2009-10-29 | Konica Minolta Holdings Inc | Driving device |
| TWI459069B (en) * | 2011-11-04 | 2014-11-01 | Altek Corp | Camera lens with improved focus accuracy and image pickup device using the same |
| KR101460263B1 (en) | 2013-01-23 | 2014-11-10 | (주)옵티스 | Camera module |
| CN108445599A (en) * | 2018-03-27 | 2018-08-24 | 瑞声科技(新加坡)有限公司 | Lens driving apparatus |
| JP2021043319A (en) * | 2019-09-11 | 2021-03-18 | 新思考電機有限公司 | Lens drive device, camera device and electronic equipment |
| JP7189852B2 (en) | 2019-09-11 | 2022-12-14 | 新思考電機有限公司 | Lens driving device, camera device and electronic device |
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