JP2825593B2 - Lens barrel - Google Patents
Lens barrelInfo
- Publication number
- JP2825593B2 JP2825593B2 JP4604490A JP4604490A JP2825593B2 JP 2825593 B2 JP2825593 B2 JP 2825593B2 JP 4604490 A JP4604490 A JP 4604490A JP 4604490 A JP4604490 A JP 4604490A JP 2825593 B2 JP2825593 B2 JP 2825593B2
- Authority
- JP
- Japan
- Prior art keywords
- cam
- cam follower
- lens
- lens holder
- optical axis
- 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.)
- Expired - Fee Related
Links
Landscapes
- Lens Barrels (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、カム突起を有するカム部材の操作によって
レンズホルダを光軸方向に駆動するレンズ鏡筒に関し、
特にズームレンズのズーミング操作の際に変倍系レンズ
を保持するレンズホルダを駆動するのに適したレンズ鏡
筒に関するものである。The present invention relates to a lens barrel that drives a lens holder in an optical axis direction by operating a cam member having a cam projection.
In particular, the present invention relates to a lens barrel suitable for driving a lens holder that holds a zoom lens during zooming operation of a zoom lens.
［従来の技術］ ズームレンズ鏡筒のカム筒のカム部を凸状とし、変倍
レンズホルダのカムフォロア部と該変倍レンズホルダ上
に設けた板バネから成る押圧手段でカム部を挟み込む事
によりガタなしスムーズに変倍レンズを移動させるよう
にした可動レンズホルダは、本出願人によって特開昭63
−101923号公報として提案されている。[Prior Art] A cam portion of a cam barrel of a zoom lens barrel is formed in a convex shape, and the cam portion is sandwiched by pressing means including a cam follower portion of a variable power lens holder and a leaf spring provided on the variable power lens holder. The movable lens holder that moves the variable power lens smoothly without play is disclosed in
-101923.
上記可動ホルダは、第５、６図に示されているよう
に、略中心部に変倍系のレンズL2が保持されるようにな
っている。そして半径外方の一部に、カム筒６の内側に
設けられている光軸方向に変位した凸状カム部6aと協働
するカムフォロア部3cが設けられている。カム部6aは、
レンズホルダ３にねじ10によって取付けられた板ばね８
の弾性力により常時カムフォロア3cに当接され、上部に
設けた管部3aを貫通するガイドバー5a及び下部に設けた
Ｕ字状の切欠部3bと嵌合するガイドバー5bにより、カム
筒の回転に従い光軸方向に移動自在となっている。The movable holder, as shown in fifth and sixth drawing, the lens L 2 of the variable power system is adapted to be held in the substantially central portion. A cam follower portion 3c cooperating with a convex cam portion 6a displaced in the optical axis direction provided inside the cam cylinder 6 is provided at a part outside the radius. The cam portion 6a
Leaf spring 8 attached to lens holder 3 by screw 10
The rotation of the cam cylinder is caused by the guide bar 5a which is always in contact with the cam follower 3c by the elastic force of In the optical axis direction.
［発明が解決しようとする課題］ 上記可動レンズホルダは、カム筒のカム部6aとレンズ
ホルダ３のカムフォロア3cとが板ばね８により常時接す
るように押圧されているので、レンズをスムーズに光軸
方向に移動させることはできるが、レンズホルダ３に板
ばねを取付けるのにねじ10を使用し、又鏡筒内の迷光に
よるフレア域はゴーストを防止するため前記板ばねは艷
消し処理が必要である等部品点数、組立工数、加工工数
等を多く必要としている。[Problems to be Solved by the Invention] In the movable lens holder, since the cam portion 6a of the cam cylinder and the cam follower 3c of the lens holder 3 are constantly pressed by the leaf spring 8, the lens is smoothly moved along the optical axis. Although it can be moved in the direction, a screw 10 is used to attach a leaf spring to the lens holder 3, and the flare area due to stray light in the lens barrel needs to be subjected to an anti-glare treatment to prevent ghosting. It requires a large number of parts, assembly steps, processing steps, etc.
したがって、本発明はレンズをガタなくスムーズに移
動させることができると共に、艷消し処理が不要で、部
品点数、組立加工工数等も軽減されたレンズ鏡筒を提供
することを目的としている。Accordingly, it is an object of the present invention to provide a lens barrel that can move a lens smoothly without play, does not require an anti-glare process, and has a reduced number of parts and assembly man-hours.
［課題を解決するための手段］ 上記の目的を達成するために、本発明では、カムフォ
ロア部を有するレンズホルダと、前記カムフォロア部を
カム突起で押すことにより前記レンズホルダを光軸方向
に移動させるカム部材と、前記カムフォロア部を前記カ
ム突起に圧接させる板バネ等の弾性部材とを有するレン
ズ鏡筒において、前記レンズホルダに、前記カムフォロ
ア部と、このカムフォロア部と光軸方向に対面するカバ
ー部とを一体的に形成し、前記カム突起を前記カムフォ
ロア部と前記カバー部との間に位置させ、前記弾性部材
を前記カムフォロア部と前記カバー部の間に差し込んで
前記レンズホルダに係止させると共に光軸方向に関して
前記カバー部で覆うようにしている。Means for Solving the Problems To achieve the above object, according to the present invention, a lens holder having a cam follower, and the lens holder is moved in an optical axis direction by pushing the cam follower with a cam projection. In a lens barrel having a cam member and an elastic member such as a leaf spring that presses the cam follower portion against the cam projection, the lens follower has a cam follower portion, and a cover portion facing the cam follower portion in an optical axis direction. And the cam projection is positioned between the cam follower and the cover, and the elastic member is inserted between the cam follower and the cover to lock the lens holder. The cover portion covers the optical axis direction.
［作用］ 上記の構成によれば、弾性部材が光軸方向に関してカ
ムフォロア部やカバー部によって覆われるので、鏡筒内
に弾性部材によって迷光が生じることはない。したがっ
て、弾性部材を艷消し処理する必要がない。また、弾性
部材は、一体的に形成されたカムフォロア部とカバー部
との間に差し込まれることにより係止されるため、ネジ
等の取付手段が不要で、部品数も少なくて済む。[Operation] According to the above configuration, since the elastic member is covered by the cam follower and the cover in the optical axis direction, no stray light is generated by the elastic member in the lens barrel. Therefore, the elastic member does not need to be decolorized. In addition, since the elastic member is locked by being inserted between the cam follower unit and the cover unit formed integrally, no mounting means such as a screw is required, and the number of parts can be reduced.
［実 施 例］ 本発明の実施例においては、操作部材はカム筒とし
て、また押圧手段は板ばねとして実施した例が示されて
いる。[Embodiment] In the embodiment of the present invention, an example in which the operating member is a cam cylinder and the pressing means is a leaf spring is shown.
以下第１、２、３及び第４図によって、本発明の１実
施例を説明する。なお、第５、６図に関して述べた要素
と同じ要素には同じ符号が付されている。An embodiment of the present invention will be described below with reference to FIGS. The same elements as those described with reference to FIGS. 5 and 6 are denoted by the same reference numerals.
変倍レンズL2を保持するレンズ保持部３′は、レンズ
ホルダの略中心部に位置し、全体は筒状を呈している。
そしてこの保持部から光軸に直交するように半径外方へ
突出する円板状の鍔部3mが一体的に形成されている。鍔
部3mの上方部分にガイドバー5aに摺動自在に貫通する管
部3aが形成され、また下部にガイドバー5bに嵌合する切
欠凹部3bが形成され、更に、該管部3aの近傍に後記する
変倍系凸カム部6aの後面6mに接するカムフォロア部3cが
一体的に突出している。またカムフォロア部3cから円周
方向に所定距離をおいて穴すなわち透孔3fが穿設されて
いる。Lens holding portion 3 for holding the zooming lens L 2 'is positioned substantially at the center portion of the lens holder, whole and has a cylindrical shape.
A disc-shaped flange 3m protruding radially outward from the holding portion so as to be orthogonal to the optical axis is integrally formed. A pipe portion 3a is formed in an upper portion of the flange portion 3m so as to slidably penetrate the guide bar 5a, and a cutout concave portion 3b fitted to the guide bar 5b is formed in a lower portion, and further, in the vicinity of the tube portion 3a. A cam follower portion 3c that comes into contact with the rear surface 6m of the variable-power convex cam portion 6a described later protrudes integrally. Further, a hole, that is, a through hole 3f is formed at a predetermined distance in the circumferential direction from the cam follower portion 3c.
レンズ保持部には、更に鍔部3mに略平行に所定の間隔
をおいて、円弧状の鍔部（カバー部）3dが設けられてい
る。この鍔部は、第１図に示されているように、その端
部はカムフォロア部3cを覆う位置まで延びている、また
鍔部3dの鍔部3mに面した位置には突起3eが形成されてい
る。The lens holding portion is further provided with an arc-shaped flange (cover) 3d at a predetermined interval substantially parallel to the flange 3m. As shown in FIG. 1, the end of the flange extends to a position covering the cam follower 3c, and a protrusion 3e is formed at a position of the flange 3d facing the flange 3m. ing.
８は平面基本部が略円弧状に形成された板ばねでレン
ズホルダ３の鍔部3mと円弧状鍔部3dの隙間に側方から差
し込んでその鍔部に設けられたＵ字部8cがレンズホルダ
３の穴3fに落ち込み、又突起3eと折り曲げ突起8bにより
位置決め固定されると共に、平面逆Ｕ字形状に形成され
た頂部8aが弾性力をもって変倍系凸カム部6aに常時当接
させられるようになっている。Reference numeral 8 denotes a leaf spring having a plane basic part formed in a substantially arc shape, which is inserted into the gap between the flange 3m and the arc-shaped flange 3d of the lens holder 3 from the side, and a U-shaped part 8c provided on the flange has a lens. It falls into the hole 3f of the holder 3, is positioned and fixed by the projection 3e and the bending projection 8b, and the top 8a formed in a plane inverted U-shape is always brought into contact with the variable power convex cam portion 6a with elastic force. It has become.
また第２図に示すようにこの変倍レンズL2の後方に配
置される補正レンズL3のレンズホルダ４も、変倍レンズ
L2のレンズホルダ３と同様に形成されてガイドバー5a、
5bに取付けられている。The lens holder of the correcting lens L 3 which is arranged behind the zoom lens L 2 as shown in FIG. 2 4 also, the variable magnifying lens
Is formed similarly to the lens holder 3 of the L 2 by guide bars 5a,
Installed on 5b.
６はレンズ固定鏡筒２に内装されるカム筒で第４図に
示すように段差をもった円筒状に形成され、その内壁部
に変倍系凸カム部6aと径の大きい方の段差部端面に光軸
方向にリフトをつけた補正系カム部6bとが穿設されてい
る。Reference numeral 6 denotes a cam barrel provided inside the lens-fixed lens barrel 2, formed in a cylindrical shape having a step as shown in FIG. 4, and having a variable-magnification convex cam 6a and a step having a larger diameter on its inner wall. A correction system cam portion 6b having a lift in the optical axis direction is formed in the end face.
変倍系凸カム部6aはその後面6m（以下主カム面と称
す）にカムフォロア部3cが当接し、またその前面6nに
（以下補助カム面と称す）に板ばね８の頂部8aが当接し
て該凸カム部6aをカムフォロア部3cと板ばね８により挾
持するようになっている。板ばね８のばね力はカムフォ
ロア部が常に主カム面6mに当接しているような付勢する
だけの力で良い。In the variable magnification convex cam portion 6a, a cam follower portion 3c abuts a rear surface 6m (hereinafter, referred to as a main cam surface), and a top portion 8a of a leaf spring 8 abuts a front surface 6n thereof (hereinafter, referred to as an auxiliary cam surface). Thus, the convex cam portion 6a is sandwiched between the cam follower portion 3c and the leaf spring 8. The spring force of the leaf spring 8 may be a force enough to urge the cam follower portion to always contact the main cam surface 6m.
本実施例による可動レンズホルダは、上記のように構
成されているので、ズーム操作環７の回転に連動してカ
ム筒６が回転するとカムフォロア部3cが主カム面6mに常
時弾性的に当接しているので、カムフォロア部3cが主カ
ム面に沿って案内され、レンズホルダを光軸方向に移動
させてズーミングが行われる。勿論このときにも補正系
のレンズホルダ４もそのカムフォロア部4aが不図示のば
ねによりカム面6bに対して変倍レンズL2側へ付勢されて
いるので移動する。Since the movable lens holder according to the present embodiment is configured as described above, when the cam barrel 6 rotates in conjunction with the rotation of the zoom operation ring 7, the cam follower portion 3c always elastically contacts the main cam surface 6m. Therefore, the cam follower 3c is guided along the main cam surface, and the lens holder is moved in the optical axis direction to perform zooming. Of course the lens holder 4 is also the cam follower portion 4a of the correction system in this case is moved because it is biased to the variable power lens L 2 side with respect to the cam surface 6b by a spring (not shown).
またレンズホルダー３はカムフォロアー部3cが折り曲
げ突起8bによって×方向の振れが押えられるため、板ば
ね８の弾性力によって凸カム部6aの主カム面6mに常時安
定した状態で当接されるようになり、光軸方向における
ガタの発生が防止されズームピント移動、ピント姿勢差
を最小に抑えられる。Further, since the cam follower portion 3c is prevented from swinging in the X direction by the bending protrusion 8b, the lens holder 3 is always in stable contact with the main cam surface 6m of the convex cam portion 6a by the elastic force of the leaf spring 8. Thus, the occurrence of backlash in the optical axis direction is prevented, and the zoom focus movement and the focus attitude difference can be minimized.
［発明の効果］ 以上説明したように、本発明によれば、弾性部材が光
軸方向に関してカムフォロア部やカバー部によって覆わ
れるので、弾性部材に対する光反射防止用の表面処理を
不要とすることができる。しかも、弾性部材は、一体的
に形成されたカムフォロア部とカバー部との間に差し込
まれることにより係止されるため、部品数を減らしたり
ネジ等の取付手段を不要としたりして組み込み作業性を
向上させることができる。[Effects of the Invention] As described above, according to the present invention, since the elastic member is covered by the cam follower portion and the cover portion in the optical axis direction, the surface treatment for preventing light reflection on the elastic member is not required. it can. In addition, since the elastic member is locked by being inserted between the cam follower portion and the cover portion formed integrally, the number of parts can be reduced and mounting means such as screws are not required, so that the mounting workability is improved. Can be improved.
第１〜４図は、本発明の１実施例を示し、第１図はその
分解斜視図図、第２図は組立てた状態の断面図、第３図
は可動レンズホルダ部分の拡大側面図、第４図はカム筒
の斜視図、第５図は従来例を示す要部断面図、第６図は
第５図において矢視Ａ−Ａでみた側断面図である。 ３……可動レンズホルダ、３′……レンズ保持部、 3c……カムフォロア部、3d……鍔部（第１）、 3m……鍔部（第２）、ｃ……カム筒、 6a……カム部、８……板ばね。1 to 4 show an embodiment of the present invention, FIG. 1 is an exploded perspective view, FIG. 2 is a sectional view of an assembled state, FIG. 3 is an enlarged side view of a movable lens holder part, FIG. 4 is a perspective view of a cam cylinder, FIG. 5 is a sectional view of a main part showing a conventional example, and FIG. 6 is a sectional side view taken along line AA in FIG. 3 ... movable lens holder, 3 '... lens holder, 3c ... cam follower, 3d ... flange (first), 3m ... flange (second), c ... cam cylinder, 6a ... Cam part 8, leaf spring.
Claims (2)
前記カムフォロア部をカム突起で押すことにより前記レ
ンズホルダを光軸方向に移動させるカム部材と、前記カ
ムフォロア部を前記カム突起に圧接させる弾性部材とを
有するレンズ鏡筒であって、 前記レンズホルダには、前記カムフォロア部と、前記カ
ムフォロア部と光軸方向に対面するカバー部とが一体的
に形成されており、前記カム突起は前記カムフォロア部
と前記カバー部との間に位置し、前記弾性部材は前記カ
ムフォロア部と前記カバー部の間に差し込まれて前記レ
ンズホルダに係止されると共に光軸方向に関して前記カ
バー部で覆われることを特徴とするレンズ鏡筒。A lens holder having a cam follower;
A lens barrel having a cam member that moves the lens holder in the optical axis direction by pressing the cam follower portion with a cam protrusion, and an elastic member that presses the cam follower portion against the cam protrusion. The cam follower portion and a cover portion facing the cam follower portion in the optical axis direction are integrally formed, and the cam projection is located between the cam follower portion and the cover portion, and the elastic member A lens barrel which is inserted between the cam follower portion and the cover portion, is locked by the lens holder, and is covered by the cover portion in the optical axis direction.
する請求項１に記載のレンズ鏡筒。2. The lens barrel according to claim 1, wherein said elastic member is a leaf spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4604490A JP2825593B2 (en) | 1990-02-27 | 1990-02-27 | Lens barrel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4604490A JP2825593B2 (en) | 1990-02-27 | 1990-02-27 | Lens barrel |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10175754A Division JP3113231B2 (en) | 1998-06-23 | 1998-06-23 | Lens barrel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03248109A JPH03248109A (en) | 1991-11-06 |
| JP2825593B2 true JP2825593B2 (en) | 1998-11-18 |
Family
ID=12736031
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4604490A Expired - Fee Related JP2825593B2 (en) | 1990-02-27 | 1990-02-27 | Lens barrel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2825593B2 (en) |
-
1990
- 1990-02-27 JP JP4604490A patent/JP2825593B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03248109A (en) | 1991-11-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |