JPH04251207A - Lens moving device - Google Patents

Lens moving device

Info

Publication number
JPH04251207A
JPH04251207A JP106091A JP106091A JPH04251207A JP H04251207 A JPH04251207 A JP H04251207A JP 106091 A JP106091 A JP 106091A JP 106091 A JP106091 A JP 106091A JP H04251207 A JPH04251207 A JP H04251207A
Authority
JP
Japan
Prior art keywords
screw shaft
meshing
holding frame
lens
lens holding
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
Application number
JP106091A
Other languages
Japanese (ja)
Inventor
Hironobu Takano
高野裕宣
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to JP106091A priority Critical patent/JPH04251207A/en
Publication of JPH04251207A publication Critical patent/JPH04251207A/en
Pending legal-status Critical Current

Links

Landscapes

  • Lens Barrels (AREA)
  • Automatic Focus Adjustment (AREA)
  • Focusing (AREA)

Abstract

PURPOSE:To obtain a lens moving device which is driven at a high speed however a screw shaft is driven and which always accurately meshes even when it is driven to be normally or reversely rotated. CONSTITUTION:When a driving member is started, the screw shaft 8a is rotated in a specified direction at a specified speed. Therefore, the meshing part meshing with the shaft 8a moves in the axial direction. The meshing part is supported by a spring member, and the spring member is connected with a lens holding frame 2 through a connecting member, so that the lens holding frame 2 is also guided by a guiding mechanism and moved in the axial direction when the meshing part is moved in the axial direction. The meshing part is provided with a means for preventing the meshing part from extending, so that meshing height with the screw shaft 8a is kept at a specified value even though the screw shaft 8a is rotated at the high speed.

Description

【発明の詳細な説明】[Detailed description of the invention]

【0001】0001

【産業上の利用分野】本発明は、レンズ群を保持するレ
ンズ保持枠と、レンズ保持枠を光軸方向のみに移動可能
に支持しているガイド機構と、ガイド機構と平行になる
ように設けられたスクリュー軸を駆動する駆動手段と、
スクリュー軸に噛合する噛合部を有し、この噛合部に所
定の噛合圧を付与するバネ部材と、バネ部材とレンズ保
持枠とを連結支持する連結部材とから成るレンズ移動装
置に関するものである。
[Industrial Application Field] The present invention provides a lens holding frame that holds a lens group, a guide mechanism that supports the lens holding frame so that it can move only in the optical axis direction, and a guide mechanism that is provided parallel to the guide mechanism. a driving means for driving the screw shaft;
The present invention relates to a lens moving device that includes a spring member that has a meshing portion that meshes with a screw shaft and applies a predetermined meshing pressure to the meshing portion, and a connecting member that connects and supports the spring member and a lens holding frame.

【0002】0002

【従来の技術】従来、レンズ群を光軸方向に移動して微
小位置決めを行うリードスクリュー方式のレンズ移動装
置としては、例えば図3および図4に示すものが知られ
ている。図3において、4はレンズ群1の光軸と平行に
配置されたガイドバーである。このガイドバーをガイド
部材として、レンズ群1はレンズ保持枠2の側下部に設
けた軸受部3によって位置決めされている。さらに、6
はガイドバー4と同様に配置されたガイドバーであり、
レンズ保持枠2の側下部に設けた二又状の係合体5と係
合することによって、レンズ群1の回転を防止している
2. Description of the Related Art Conventionally, as a lead screw type lens moving device for performing fine positioning by moving a lens group in the optical axis direction, for example, those shown in FIGS. 3 and 4 are known. In FIG. 3, 4 is a guide bar arranged parallel to the optical axis of the lens group 1. In FIG. Using this guide bar as a guide member, the lens group 1 is positioned by a bearing 3 provided at the lower side of the lens holding frame 2. Furthermore, 6
is a guide bar arranged similarly to guide bar 4,
Rotation of the lens group 1 is prevented by engaging with a fork-shaped engaging body 5 provided at the lower side of the lens holding frame 2.

【0003】上記レンズ保持枠2の下部に突設された部
材7は、モータ10のスクリュー軸9と噛合う噛合部8
a,8bをもつバネ材8を支持する連結部材である。ま
た、モータ10はそのスクリュー軸9が上記ガイドバー
4、またはガイドバー6と平行にかつ上記噛合部8a、
8bと噛合うように配置されている。
The member 7 protruding from the lower part of the lens holding frame 2 has a meshing portion 8 that meshes with the screw shaft 9 of the motor 10.
This is a connecting member that supports the spring member 8 having the elements a and 8b. Further, the motor 10 has its screw shaft 9 parallel to the guide bar 4 or the guide bar 6, and the meshing portion 8a,
It is arranged so as to mesh with 8b.

【0004】モータ10の駆動によりその出力軸である
スクリュー軸9を回転すると、噛合部8a、8bがバネ
材8によってスクリュー軸9との噛合状態を維持しつつ
、かつ、スクリュー軸9に沿って移動する。さらに噛合
部8a、8bは連結部材7を介してその動きをレンズ保
持枠2に伝える。
When the screw shaft 9, which is the output shaft, is rotated by the drive of the motor 10, the meshing portions 8a and 8b maintain the meshing state with the screw shaft 9 by the spring material 8, and move along the screw shaft 9. Moving. Furthermore, the meshing parts 8a and 8b transmit their movements to the lens holding frame 2 via the connecting member 7.

【0005】レンズ保持枠2はガイドバー4によって位
置決めされながら、かつ、ガイドバー6によって回転を
防止されながら光軸方向に移動する。この時、例えばス
クリュー軸9のネジピッチが0.5mmならば、モータ
10の1回転によりレンズ保持枠2は0.5mm移動し
、また、モータ10が20パルスで1回転ならば、1パ
ルスで0.5/20mm単位の移動となる。
The lens holding frame 2 moves in the optical axis direction while being positioned by a guide bar 4 and prevented from rotating by a guide bar 6. At this time, for example, if the thread pitch of the screw shaft 9 is 0.5 mm, the lens holding frame 2 will move by 0.5 mm with one revolution of the motor 10, and if the motor 10 makes one revolution with 20 pulses, one pulse will move the lens holding frame 2 by 0.5 mm. .5/20mm unit movement.

【0006】また、従来、図4に示すレンズ移動装置も
知られている。この装置は前述した図3のレンズ移動装
置に対し、連結部7と軸受部3を一体構造としたもので
ある。
[0006] Also, a lens moving device shown in FIG. 4 is conventionally known. This device is different from the lens moving device of FIG. 3 described above, in which the connecting portion 7 and the bearing portion 3 are integrated.

【0007】[0007]

【発明が解決しようとする課題】しかしながら、上記従
来例ではモータ10が高速回転を行うと噛合部8a、8
bがバネ材で支持されているので、外側に逃げるため次
のような欠点があった。 (1)噛合部8a,8bとスクリュー軸9との噛合い高
さが減少する。 (2)(1)の状態でボディー本体に衝撃が加ると、そ
の後のレンズ位置制御に異常をきたす。 (3)噛合い高さが減少するのでガタが多くない正逆転
時にヒステリシスを発生する。
However, in the above conventional example, when the motor 10 rotates at high speed, the meshing portions 8a, 8
Since b is supported by a spring material, it escapes to the outside, which has the following drawback. (1) The height of engagement between the engagement portions 8a, 8b and the screw shaft 9 is reduced. (2) If an impact is applied to the body in the state of (1), subsequent lens position control will be abnormal. (3) Since the engagement height decreases, hysteresis occurs during forward and reverse rotation when there is not much play.

【0008】したがって、本発明は、スクリュー軸と噛
み合う噛合部材がバネ部材に支持されていて、スクリュ
ー軸がどのように駆動されても、すなわち高速で駆動さ
れ、また正逆転駆動されても、常に正しい噛み合いをす
るレンズ移動装置を提供することを目的としている。
Therefore, in the present invention, the meshing member that meshes with the screw shaft is supported by the spring member, and no matter how the screw shaft is driven, that is, whether it is driven at high speed or driven in the forward and reverse directions, the meshing member that meshes with the screw shaft is always The object of the present invention is to provide a lens moving device that provides correct meshing.

【0009】[0009]

【課題を解決するための手段】本発明は、上記目的を達
成するために、レンズ群を保持するレンズ保持枠と、該
レンズ保持枠を光軸方向のみに移動可能に支持している
ガイド機構と、該ガイド機構と平行になるように設けら
れたスクリュー軸を駆動する駆動手段と、前記スクリュ
ー軸に噛合する噛合部を有し、該噛合部に所定の噛合圧
を付与するバネ部材と、前記バネ部材と前記レンズ保持
枠とを連結支持する連結部材から成り、前記噛合部は、
前記スクリュー軸との噛み合い高さが、所定の高さ以上
となるように、噛合部広がり防止手段を備えるように構
成される。
[Means for Solving the Problems] In order to achieve the above object, the present invention provides a lens holding frame that holds a lens group, and a guide mechanism that supports the lens holding frame so as to be movable only in the optical axis direction. a driving means for driving a screw shaft provided parallel to the guide mechanism; a spring member having a meshing portion meshing with the screw shaft and applying a predetermined meshing pressure to the meshing portion; The meshing portion includes a connecting member that connects and supports the spring member and the lens holding frame;
It is configured to include means for preventing expansion of the meshing portion so that the meshing height with the screw shaft is equal to or higher than a predetermined height.

【0010】0010

【作用】本発明は、上記のように構成されているので、
今駆動部材を起動すると、スクリュー軸が所定の方向に
所定の速度で回転する。したがってこれに噛み合ってい
る噛み合部が軸方向に移動する。噛合部はバネ部材に支
持され、そしてバネ部材は連結部材を介してレンズ保持
枠に接続されているので、噛合部が軸方向に移動すると
、レンズ保持枠もガイド機構により案内されて軸方向に
移動する。このとき噛合部は噛合部広がり防止手段を備
えているので、スクリュー軸が例え高速で回転しても、
スクリュー軸との噛み合い高さは所定値に保たれる。
[Operation] Since the present invention is configured as described above,
When the drive member is activated now, the screw shaft rotates in a predetermined direction at a predetermined speed. Therefore, the meshing portion meshing with this moves in the axial direction. The engaging part is supported by the spring member, and the spring member is connected to the lens holding frame via the connecting member, so when the engaging part moves in the axial direction, the lens holding frame is also guided by the guide mechanism and moves in the axial direction. Moving. At this time, the meshing part is equipped with a means to prevent the meshing part from expanding, so even if the screw shaft rotates at high speed,
The height of engagement with the screw shaft is maintained at a predetermined value.

【0011】[0011]

【実施例】以下に本発明の実施例を図1,2を用いて説
明する。図1は、本発明の1実施例であり、図において
、バー4はレンズ群1の光軸と平行に配置されたガイド
機能を構成するガイド部材である。このガイド部材によ
って、レンズ群1はレンズ保持枠2の左部に設けられた
軸受部3によって位置決められている。さらに、バー6
はバー4と同様に配置されたガイドバーであり、レンズ
保持枠2の右部に設けた二又状の係合体5と係合するこ
とによってレンズ群1の回転を防止している。
[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 shows one embodiment of the present invention, and in the figure, a bar 4 is a guide member disposed parallel to the optical axis of the lens group 1 and forming a guide function. With this guide member, the lens group 1 is positioned by a bearing 3 provided on the left side of the lens holding frame 2. Furthermore, bar 6
A guide bar is arranged in the same manner as the bar 4, and prevents the lens group 1 from rotating by engaging with a forked engagement body 5 provided on the right side of the lens holding frame 2.

【0012】また、上記レンズ保持枠2の左部に突設さ
れた部材7は、モータ10のスクリュー軸9と噛合う噛
合部8a,8bをもつバネ材8を支持する連結部材であ
る。そして、モータ10はそのスクリュー軸9が上記ガ
イドバー4又はガイドバー6と平行にかつ上記噛合部8
a、8bと噛み合うように配置されている。さらに部材
11は噛合部8a,8bを覆うように設けられたキャッ
プを示している。
A member 7 protruding from the left side of the lens holding frame 2 is a connecting member that supports a spring member 8 having meshing portions 8a and 8b that mesh with the screw shaft 9 of the motor 10. The motor 10 has its screw shaft 9 parallel to the guide bar 4 or the guide bar 6 and the meshing portion 8.
It is arranged so as to mesh with a and 8b. Further, the member 11 represents a cap provided to cover the engaging portions 8a and 8b.

【0013】このキャップ11は、図1,2に示されて
いるように、全体は略立方形を呈し、その一方の面には
円弧状の凹部が形成されている。したがって側面的にみ
ると略コ字形をしている。そしてこのキャップ11の一
方の側片11aは、一方の板バネ8Cに例えば接着剤で
固着され、他方の側片11bは自由となっていて、他方
の板バネ8dと間隙lを有する。この間隙lは、スクリ
ュー軸9と噛合部8bとの噛合い高さが所定値以上とな
るように設定されている。
As shown in FIGS. 1 and 2, the cap 11 has a substantially cubic shape as a whole, and an arcuate recess is formed on one surface thereof. Therefore, when viewed from the side, it is approximately U-shaped. One side piece 11a of this cap 11 is fixed to one leaf spring 8C with, for example, an adhesive, and the other side piece 11b is free and has a gap l with the other leaf spring 8d. This gap 1 is set so that the engagement height between the screw shaft 9 and the engagement portion 8b is greater than or equal to a predetermined value.

【0014】したがって、スクリュー軸9が高速で回転
しても或は板バネ、スクリュー軸、本体等に振動が加わ
っても、スクリュー軸9と噛合部8a,8bとの噛み合
い高は、常に所定値に維持される。
Therefore, even if the screw shaft 9 rotates at high speed, or even if vibrations are applied to the leaf spring, screw shaft, main body, etc., the meshing height between the screw shaft 9 and the meshing parts 8a, 8b will always remain at a predetermined value. will be maintained.

【0015】[0015]

【発明の効果】以上のように本発明によると、レンズ保
持枠を移動させるためのスクリュー軸に噛み合っている
噛合部は、この噛合部が広がるのを防止する手段を備え
ているので、スクリュー軸が高速で回転しても、スクリ
ュー軸と噛合部との噛み合い高さは一定に保たれる。し
たがって、例えボディ或は本体に振動が加わっても、そ
の後のレンズ位置制御に異常をきたすようなことはない
。また噛み合い高さが減少するようなことがないので、
正逆転時にヒステリスを起こすようなこともない。
As described above, according to the present invention, the meshing portion that meshes with the screw shaft for moving the lens holding frame is provided with a means for preventing the meshing portion from widening. Even if the screw rotates at high speed, the engagement height between the screw shaft and the engagement portion remains constant. Therefore, even if vibration is applied to the body or main body, there will be no abnormality in subsequent lens position control. Also, since there is no reduction in the engagement height,
Hysteresis does not occur during forward and reverse rotation.

【図面の簡単な説明】[Brief explanation of the drawing]

【図1】本発明の1実施例の要部を示す斜視図である。FIG. 1 is a perspective view showing essential parts of an embodiment of the present invention.

【図2】その拡大側面図である。FIG. 2 is an enlarged side view thereof.

【図3】従来例を示す側面図である。FIG. 3 is a side view showing a conventional example.

【図4】他の従来例を示す側面図である。FIG. 4 is a side view showing another conventional example.

【符号の説明】[Explanation of symbols]

1…レンズ群            2…レンズ保持
枠4,6…ガイドバー        8…噛合部a…
スクリュー軸      10…モータ11…キャップ
1... Lens group 2... Lens holding frame 4, 6... Guide bar 8... Engaging portion a...
Screw shaft 10...Motor 11...Cap

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】  レンズ群を保持するレンズ保持枠と、
該レンズ保持枠を光軸方向のみに移動可能に支持してい
るガイド機構と、該ガイド機構と平行になるように設け
られたスクリュー軸を駆動する駆動手段と、前記スクリ
ュー軸に噛合する噛合部を有し、該噛合部に所定の噛合
圧を付与するバネ部材と、前記バネ部材と前記レンズ保
持枠とを連結支持する連結部材から成り、前記噛合部は
、前記スクリュー軸との噛み合い高さが、所定の高さ以
上となるように、噛合部広がり防止手段を備えているこ
とを特徴とするレンズ移動装置。
[Claim 1] A lens holding frame that holds a lens group;
A guide mechanism that supports the lens holding frame so as to be movable only in the optical axis direction, a driving means that drives a screw shaft provided parallel to the guide mechanism, and a meshing portion that meshes with the screw shaft. a spring member that applies a predetermined meshing pressure to the meshing portion, and a connecting member that connects and supports the spring member and the lens holding frame, and the meshing portion has a meshing height with the screw shaft. 1. A lens moving device comprising means for preventing expansion of a meshing portion so that the height of the lens is at least a predetermined height.
JP106091A 1991-01-09 1991-01-09 Lens moving device Pending JPH04251207A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP106091A JPH04251207A (en) 1991-01-09 1991-01-09 Lens moving device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP106091A JPH04251207A (en) 1991-01-09 1991-01-09 Lens moving device

Publications (1)

Publication Number Publication Date
JPH04251207A true JPH04251207A (en) 1992-09-07

Family

ID=11490997

Family Applications (1)

Application Number Title Priority Date Filing Date
JP106091A Pending JPH04251207A (en) 1991-01-09 1991-01-09 Lens moving device

Country Status (1)

Country Link
JP (1) JPH04251207A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012252288A (en) * 2011-06-07 2012-12-20 Canon Inc Lens drive device, and optical apparatus with the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012252288A (en) * 2011-06-07 2012-12-20 Canon Inc Lens drive device, and optical apparatus with the same

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