JP2792790B2 - Lens barrel - Google Patents
Lens barrelInfo
- Publication number
- JP2792790B2 JP2792790B2 JP4183831A JP18383192A JP2792790B2 JP 2792790 B2 JP2792790 B2 JP 2792790B2 JP 4183831 A JP4183831 A JP 4183831A JP 18383192 A JP18383192 A JP 18383192A JP 2792790 B2 JP2792790 B2 JP 2792790B2
- Authority
- JP
- Japan
- Prior art keywords
- cam
- lens
- optical axis
- guide
- axis direction
- 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
【０００１】[0001]
【産業上の利用分野】本発明はレンズ鏡筒に係り、ズー
ムカメラ等における、撮影レンズ駆動機構に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens barrel and, more particularly, to a photographic lens driving mechanism in a zoom camera or the like.
【０００２】[0002]
【従来の技術】従来のズームレンズの撮影レンズ駆動機
構は、撮影レンズを保持するレンズ枠の外周に直進ガイ
ド筒、更にその外周にカム筒を配し、前記レンズ枠の外
周に固着したカムフォロワを前記直進ガイド筒の撮影光
軸に平行な直進溝と、前記カム筒のカム溝にカン合させ
ることで撮影レンズの保持を行なわせ、前記直進ガイド
筒に対して前記カム筒を撮影光軸を軸にして相対的に回
動させることで撮影レンズの光軸方向への移動を行なわ
せるものが多かった。2. Description of the Related Art A photographing lens driving mechanism of a conventional zoom lens has a straight guide tube on the outer periphery of a lens frame for holding a photographing lens, and a cam tube on the outer periphery of the guide tube, and a cam follower fixed to the outer periphery of the lens frame. The straight-moving groove parallel to the photographing optical axis of the straight guide cylinder and the cam groove of the cam cylinder are engaged with each other to hold the photographing lens. In many cases, the photographing lens is moved in the optical axis direction by relatively rotating about the axis.
【０００３】[0003]
【発明が解決しよとする課題】しかしながら前記従来の
レンズ鏡筒では、前記直進ガイド筒は、撮影光路内に進
入しない直径に設定しなければならず、ズームレンズ鏡
筒の小型化、ひいてはズームカメラの小型化の妨げにな
っていた。However, in the conventional lens barrel, the diameter of the straight guide tube must be set so as not to enter the photographing optical path. This hindered camera miniaturization.
【０００４】本発明はこのような従来の問題点を解決
し、直進ガイド等の設計の自由度を多くし、小型化、ひ
いてはカメラの小型化に寄与できるレンズ鏡筒を提供す
ることを目的とする。An object of the present invention is to solve such a conventional problem and to provide a lens barrel capable of increasing the degree of freedom in designing a straight guide and the like, and contributing to downsizing and further downsizing of a camera. I do.
【０００５】[0005]
【課題を解決するための手段（及び作用）】本出願に係
る発明の目的を実現する構成は、レンズを保持し、外周
にカムフォロアを有するレンズ枠と、前記カムフォロア
に係合するガイド部を有し、該ガイド部によって前記レ
ンズ枠を光軸方向へガイドするガイド筒と、前記カムフ
ォロアに係合するカム部を有し、該カム部によって前記
レンズを光軸方向へ移動させるカム筒とを有するレンズ
鏡筒において、前記ガイド部と前記カムフォロアのそれ
ぞれを光軸方向から見て撮影画面の対角方向をさけた位
置に配置し、且つ前記ガイド筒の後端の光軸方向から見
て撮影画面の対角方向の箇所に切欠きを設けたものであ
る。 この構成により、ガイド筒及びカム筒の径を小さく
しても撮影光路をけることはなく、レンズ鏡筒の小型化
が可能となった。 SUMMARY OF (and effects)] engaged in this application
In order to achieve the object of the invention, the lens holding and the outer periphery
A lens frame having a cam follower, and the cam follower
A guide portion that engages with
A guide tube for guiding the lens frame in the optical axis direction,
A cam portion for engaging the follower, and the cam portion
Lens having a cam barrel for moving the lens in the optical axis direction
In the lens barrel, the guide portion and the cam follower
When viewed from the direction of the optical axis,
From the optical axis direction of the rear end of the guide tube.
Notch in the diagonal direction of the shooting screen
You. With this configuration, the diameter of the guide cylinder and the cam cylinder can be reduced.
Even without taking the shooting optical path, miniaturization of the lens barrel
Became possible.
【０００６】[0006]
【実施例】図１から図４は本発明の実施例を示してお
り、図１は、ズームレンズ保持部を後方から見た図で、
図２は断面ＡＡ、図３は側面図で、図４は直進ガイド筒
の展開図である。１は６本のカム溝１ａを有するカム筒
で、撮影光軸を中心にして回動可能に保持されている。
２は、撮影光軸に平行な６本の直進溝２ｅを有する直進
ガイド筒でカメラ本体８に固着されており、外周にはカ
ム筒１が嵌合している。３は第１の撮影レンズ６を保持
する第１のレンズ枠で、外周にはカムフォロワ３ａ，３
ｂ，３ｃが固着されており、該カムフォロワ３ａ，３
ｂ，３ｃはそれぞれ直進ガイド筒２の直進溝２ｅとカム
筒１のカム溝１ａに嵌合し、第１のレンズ枠３は所定の
位置に保持されている。４は第２の撮影レンズ７を保持
する第２のレンズ枠で、外周にはカムフォロワ４ａ，４
ｂ，４ｃが固着され、該カムフォロワ４ａ，４ｂ，４ｃ
は直進ガイド筒２の直進溝２ｅとカム筒１のカム溝１ａ
にカン合し、第２のレンズ枠４は所定の位置に保持され
ている。５は撮影画面枠、９はフィルム、１０は撮影光
路である。1 to 4 show an embodiment of the present invention. FIG. 1 is a view of a zoom lens holding portion viewed from the rear.
FIG. 2 is a sectional view taken along the line AA, FIG. 3 is a side view, and FIG. 4 is a developed view of a straight guide cylinder. Reference numeral 1 denotes a cam cylinder having six cam grooves 1a, which is rotatably held about a photographing optical axis.
Reference numeral 2 denotes a rectilinear guide tube having six rectilinear grooves 2e parallel to the photographing optical axis, which is fixed to the camera body 8, and the cam tube 1 is fitted on the outer periphery. Reference numeral 3 denotes a first lens frame for holding the first photographing lens 6, and cam followers 3a, 3
b, 3c are fixed, and the cam followers 3a, 3c
b and 3c are fitted in the rectilinear groove 2e of the rectilinear guide cylinder 2 and the cam groove 1a of the cam cylinder 1, respectively, and the first lens frame 3 is held at a predetermined position. Reference numeral 4 denotes a second lens frame for holding the second photographing lens 7, and cam followers 4a, 4
b, 4c are fixed, and the cam followers 4a, 4b, 4c
Is a straight groove 2e of the straight guide tube 2 and a cam groove 1a of the cam tube 1.
The second lens frame 4 is held at a predetermined position. Reference numeral 5 denotes a shooting screen frame, 9 denotes a film, and 10 denotes a shooting optical path.
【０００７】図１に示すように第１のレンズ枠３のカム
フォロワ３ａ，３ｂ，３ｃと第２のレンズ枠４のカムフ
ォロワ４ａ，４ｂ，４ｃは撮影画面枠５の対角方向をさ
けた位置に配置され、したがってカムフォロワ３ａ，３
ｂ，３ｃ，４ａ，４ｂ，４ｃの嵌合する直進ガイド筒２
の直進溝２ｅも撮影画面枠５の対角方向をさけた位置に
設けられている。直進ガイド筒２の、撮影画面枠５の対
角方向には、切欠き２ａ，２ｂ，２ｃ，２ｄが設けられ
ており、図２に示すように撮影光路８をけらないように
なっている。As shown in FIG. 1, the cam followers 3a, 3b, 3c of the first lens frame 3 and the cam followers 4a, 4b, 4c of the second lens frame 4 are located at positions diagonal to the photographing screen frame 5. And thus the cam followers 3a, 3
b, 3c, 4a, 4b, 4c
The rectilinear groove 2e is also provided at a position away from the diagonal direction of the photographing screen frame 5. Notches 2a, 2b, 2c, and 2d are provided in the rectilinear guide cylinder 2 in diagonal directions of the photographing screen frame 5, so that the photographing optical path 8 is not cut off as shown in FIG.
【０００８】カム筒１には図示せぬ公知のズーム駆動機
構が連結しており、該ズーム駆動機構により、カム筒１
は撮影光軸を中心にして回動し、第１のレンズ枠３、第
２のレンズ枠４はそれぞれ直進ガイド筒２の直進溝２ｅ
にガイドされながらカム筒１のカム溝１ａに従って所定
量撮影光軸方向に移動し、撮影レンズのズーミングが行
なわれる。ズーミングによりいかなる焦点距離において
も撮影光路８をけらないように直進ガイド筒２の切欠き
２ａ，２ｂ，２ｃ，２ｄの切欠き量がきめられている。A known zoom drive mechanism (not shown) is connected to the cam barrel 1, and the zoom drive mechanism causes the cam barrel 1 to move.
Is rotated about the photographing optical axis, and the first lens frame 3 and the second lens frame 4 are respectively provided in the rectilinear grooves 2 e of the rectilinear guide cylinder 2.
Is moved in the direction of the photographing optical axis by a predetermined amount in accordance with the cam groove 1a of the cam cylinder 1 while being guided by the camera, so that the photographing lens is zoomed. The notches 2a, 2b, 2c, and 2d of the straight guide tube 2 have predetermined cutout amounts so as not to cut the photographing optical path 8 at any focal length by zooming.
【０００９】[0009]
【発明の効果】以上説明したように本発明によれば、レ
ンズを保持し、外周にカムフォロアを有するレンズ枠
と、前記カムフォロアに係合するガイド部を有し、該ガ
イド部によって前記レンズ枠を光軸方向へガイドするガ
イド筒と、前記カムフォロアに係合するカム部を有し、
該カム部によって前記レンズを光軸方向へ移動させるカ
ム筒とを有するレンズ鏡筒において、前記ガイド部と前
記カムフォロアのそれぞれを光軸方向から見て撮影画面
の対角方向をさけた位置に配置し、且つ前記ガイド筒の
後端の光軸方向から見て撮影画面の対角方向の箇所に切
欠きを設けたので、ガイド筒及びカム筒の径を小さくし
ても撮影光路をけることはなく、レンズ鏡筒の小型化が
可能となった。 According to the present invention as described above, according to the present invention, Les
Lens frame that holds the lens and has a cam follower on the outer circumference
And a guide portion that engages with the cam follower.
A guide for guiding the lens frame in the optical axis direction by a guide portion.
An id cylinder, having a cam portion engaged with the cam follower,
A cam for moving the lens in the optical axis direction by the cam portion.
A lens barrel having a lens barrel,
Shooting screen when viewing each of the cam followers from the optical axis direction
And at a position away from the diagonal direction of
Cut to the diagonal part of the shooting screen when viewed from the rear end optical axis direction.
Is provided with the lack is not also takes the photographing optical path by reducing the diameter of the guide tube and the cam tube, has enabled miniaturization of lenses barrel.
【図１】本発明によるレンズ鏡筒の一実施例を示し、レ
ンズ鏡筒を後方から見た図。FIG. 1 shows an embodiment of a lens barrel according to the present invention, and is a view of the lens barrel viewed from the rear.
【図２】図１のＡ−Ａ線断面図。FIG. 2 is a sectional view taken along line AA of FIG.
【図３】図１のカム筒の側面図。FIG. 3 is a side view of the cam cylinder of FIG. 1;
【図４】図１の直進ガイド筒の展開図。FIG. 4 is an exploded view of the straight guide cylinder of FIG. 1;
１ カム筒 ２ 直進ガイド筒 ３ 第１のレンズ枠 ４ 第２のレンズ枠 ５ 撮影画面 ６ 第１のレンズ ７ 第２のレンズ ８ 本体 ９ フィルム １０ 撮影光路 REFERENCE SIGNS LIST 1 cam cylinder 2 straight guide cylinder 3 first lens frame 4 second lens frame 5 shooting screen 6 first lens 7 second lens 8 body 9 film 10 shooting optical path
Claims (1)
有するレンズ枠と、前記カムフォロアに係合するガイド
部を有し、該ガイド部によって前記レンズ枠を光軸方向
へガイドするガイド筒と、前記カムフォロアに係合する
カム部を有し、該カム部によって前記レンズを光軸方向
へ移動させるカム筒とを有するレンズ鏡筒において、前記ガイド部と前記カムフォロアのそれぞれを光軸方向
から見て撮影画面の対角方向をさけた位置に配置し、且
つ前記ガイド筒の後端の光軸方向から見て撮影画面の対
角方向の箇所に切欠きを設けた ことを特徴とするレンズ
鏡筒。1. A lens frame that holds a lens and has a cam follower on the outer periphery, and a guide that engages with the cam follower.
Part, and the lens frame is moved in the optical axis direction by the guide part.
Engages with the guide cylinder that guides the cam follower and the cam follower
A cam portion for moving the lens in the optical axis direction by the cam portion.
A lens barrel having a cam barrel for moving the guide section and the cam follower in the optical axis direction.
From the diagonal direction of the shooting screen as viewed from above, and
When viewed from the optical axis direction at the rear end of the guide tube,
A lens barrel characterized in that a notch is provided in a corner portion .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4183831A JP2792790B2 (en) | 1992-07-10 | 1992-07-10 | Lens barrel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4183831A JP2792790B2 (en) | 1992-07-10 | 1992-07-10 | Lens barrel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0627361A JPH0627361A (en) | 1994-02-04 |
| JP2792790B2 true JP2792790B2 (en) | 1998-09-03 |
Family
ID=16142612
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4183831A Expired - Fee Related JP2792790B2 (en) | 1992-07-10 | 1992-07-10 | Lens barrel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2792790B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2691562B2 (en) * | 1988-06-03 | 1997-12-17 | 旭光学工業株式会社 | Lens barrel |
-
1992
- 1992-07-10 JP JP4183831A patent/JP2792790B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0627361A (en) | 1994-02-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |