JPH0614175Y2 - Cam barrel of zoom lens barrel - Google Patents
Cam barrel of zoom lens barrelInfo
- Publication number
- JPH0614175Y2 JPH0614175Y2 JP1987004353U JP435387U JPH0614175Y2 JP H0614175 Y2 JPH0614175 Y2 JP H0614175Y2 JP 1987004353 U JP1987004353 U JP 1987004353U JP 435387 U JP435387 U JP 435387U JP H0614175 Y2 JPH0614175 Y2 JP H0614175Y2
- Authority
- JP
- Japan
- Prior art keywords
- cam
- barrel
- moving
- cylinder
- hole
- 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 - Lifetime
Links
Landscapes
- Lens Barrels (AREA)
Description
【考案の詳細な説明】 「産業上の利用分野」 この考案は、写真撮影用カメラ、小形撮影機、ビデオカ
メラ、複写機、引伸機などの光学機器に利用するところ
のズームレンズ鏡胴に関する。DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention relates to a zoom lens barrel used in optical equipment such as a camera for photographing, a small-sized photographing machine, a video camera, a copying machine, and an enlarger.
「従来の技術」 ズームレンズ鏡胴は、周囲に沿った細長いカム孔を有す
るカム筒と、上記カム孔に嵌入させたカムフォロア（ピ
ン状のローラー）を備え、上記カム筒に内装させて変倍
用レンズと補正用レンズとを支持させた移動筒とを備え
ており、上記カム筒を回動駆動することによって上記移
動筒を光軸方向に移動させ光学的な変倍を行なう構成と
なっている。“Prior Art” A zoom lens barrel includes a cam barrel having a long and narrow cam hole along the circumference and a cam follower (pin-shaped roller) fitted in the cam hole, and is mounted inside the cam barrel to change the magnification. And a moving lens supporting a correction lens, and by rotating the cam barrel, the moving barrel is moved in the optical axis direction to perform optical scaling. There is.
実際には、複数の移動筒がカム筒に内装され、これら移
動筒の各々が固定筒に案内されながらカム筒に連動され
て移動する構成のものが多い。In many cases, a plurality of moving barrels are actually installed in the cam barrel, and each of these moving barrels moves in conjunction with the cam barrel while being guided by the fixed barrel.
「考案が解決しようとする問題点」 上記したズームレンズ鏡胴に備えられたカム筒は、筒軸
方向に定めたΔと筒周囲方向に定めたΔθとの設計値
にもとづいて順次加工した細長いカム孔を有し、多くの
場合、対称位置に設けた２つのカム孔に一つの移動筒か
ら突設した各カムフォロアを突入させる構成となってい
る。そして、一般には、複数の移動筒を備えているた
め、各々の移動筒のカムフォロアに対応させた多数のカ
ム孔を備えたものとなっている。“Problems to be solved by the invention” The cam barrel provided in the zoom lens barrel described above is a long and narrow machined one after another based on the design values of Δ defined in the axial direction of the cylinder and Δθ defined in the circumferential direction of the cylinder. It has a cam hole, and in many cases, each cam follower protruding from one moving cylinder is inserted into two cam holes provided at symmetrical positions. Further, in general, since a plurality of moving barrels are provided, a large number of cam holes corresponding to the cam followers of each moving barrel are provided.
このことから、上記したようなカム筒は多くのカム孔の
ために光軸方向に長くなり、これが、ズームレンズ鏡胴
の短縮化を計る上に問題となっている。For this reason, the above-mentioned cam barrel becomes long in the optical axis direction due to many cam holes, which becomes a problem in shortening the zoom lens barrel.
また、上記したカム筒は周囲に沿った細長いカム孔とな
っている関係で、合成樹脂材などを使って型抜き加工す
ることが困難で、金属性材によって構成されているた
め、生産能率が低いばかりでなく、コスト高の部品とな
る。Further, since the above-mentioned cam cylinder is a long and narrow cam hole along the circumference, it is difficult to perform die cutting using a synthetic resin material or the like, and since it is made of a metal material, the production efficiency is improved. Not only low cost but also high cost parts.
上記のような問題を解決するため、本出願の考案者等は
型抜き加工によって生産できるこの種のカム筒を開発
し、昭和６１年実用新案登録願第１６２１７８号として
既に出願してある。In order to solve the above problems, the inventors of the present application have developed a cam cylinder of this type that can be produced by die cutting, and have already filed it as a utility model registration application No. 162178 in 1986.
かかる出願のカム筒は、一端から筒軸方向に切り込み形
成した一方側カム孔と、他端から筒軸方向に切り込み、
上記一方側カム孔に対して筒周囲位置を変えて形成した
他方側カム孔とを備える構成となっている。The cam cylinder of this application has one side cam hole formed by cutting from one end in the cylinder axial direction and the other end cut in the cylinder axial direction by the other end.
The other side cam hole is formed by changing the cylinder peripheral position with respect to the one side cam hole.
このカム筒は、一方側カム孔と他方側カム孔とが筒周囲
方向に交互に配置されることになるから、筒長の短縮化
が可能になり、また、合成樹脂材等を使って型抜き形成
することができて極めて有利である。In this cam barrel, the one side cam hole and the other side cam hole are alternately arranged in the circumferential direction of the cylinder, so that the length of the cylinder can be shortened, and the mold is made by using a synthetic resin material or the like. It is extremely advantageous that it can be formed by punching.
ただ、上記したカム筒の場合、カムフォロアをばね勢力
によってカム面に圧接させる構成となる関係で、移動枠
に手動力が加わる構成とすると、カムフォロアがカム面
から離れることがあり、この場合、移動枠がカム筒と関
係なく動くことになると言う問題がある。However, in the case of the above-mentioned cam barrel, if the cam follower is pressed against the cam surface by the spring force, and if a manual force is applied to the moving frame, the cam follower may separate from the cam surface. There is a problem that the frame will move regardless of the cam barrel.
すなわち、各レンズを支持させた各々の移動枠をカメラ
の外表面よりはみ出させないようにすれば問題がない
が、例えば、前玉レンズ群を支持させた移動枠（或いは
レンズ支持枠）をカメラ前方に突き出させる構成とする
と、この移動枠が手指によってカメラ前方向に引き出さ
れることがあり、この場合、カムフォロアがばね勢力に
抗してカム面から離れてカム孔内を移動するようにな
る。このときには、移動枠がカム筒の回動駆動とは関係
のない移動位置となる結果、ピンボケの写真となってし
まうことがある。That is, there is no problem as long as each moving frame supporting each lens does not extend beyond the outer surface of the camera. For example, the moving frame supporting the front lens group (or the lens supporting frame) is placed in front of the camera. With this configuration, the moving frame may be pulled out in the front direction of the camera by fingers, and in this case, the cam follower moves in the cam hole away from the cam surface against the spring force. At this time, as a result of the moving frame being at a moving position that is unrelated to the rotational driving of the cam barrel, an out-of-focus photograph may result.
「問題点を解決するための手段」 本考案は、カム筒の光軸方向の長さを充分に短縮するこ
とができ、かつ、型抜き加工によって容易に生産するこ
とができると共に、上記した問題点を解決したズームレ
ンズ鏡胴のカム筒を開発することを目的とする。"Means for Solving Problems" The present invention can sufficiently reduce the length of the cam barrel in the optical axis direction, can be easily produced by die cutting, and has the above-mentioned problems. The objective is to develop a cam barrel for a zoom lens barrel that solves the problem.
しかして、本考案では、筒状体の前端から筒軸方向に切
り込み形成した形状で、切り込み縁壁部をカム面とした
一方側カム孔と、その後端から筒軸方向に切り込み形成
した形状をなし、上記一方側カム孔に対して筒周囲位置
を変えて形成し、切り込み縁壁部をカム面とした他方側
カム孔とを有するカム筒と、後方向に移動勢力を与える
ようにして前玉レンズを支持させた第１移動枠と、前方
向に移動勢力を与えた第２移動枠とを備え、第１移動枠
のカムフォロアをカム筒の一方側カム孔のカム面に、第
２移動枠のカムフォロアをその他方側カム孔のカム面に
各々対接させ、これら第１、第２移動枠をカム筒の回動
に連動させて移動させ、移動枠各々に支持させたレンズ
の位置変化により光学的に変倍する構成のズームレンズ
鏡胴において、上記したカム筒には、一方側カム孔と他
方側カム孔の外周囲または一方向側カム孔の外周囲にな
るようにして、カム面と平行させたカム面平行壁を設け
た被板部を一体形成し、カム面平行壁とカム面に対接し
たカムフォロアとを少ない間隔に設定する構成としたこ
とを特徴とするズームレンズ鏡胴のカム筒を提案する。Therefore, in the present invention, a shape is formed by cutting from the front end of the cylindrical body in the cylinder axis direction, and one side cam hole having the cut edge wall portion as the cam surface and a shape formed by cutting from the rear end in the cylinder axis direction are formed. None, a cam cylinder that is formed by changing the cylinder peripheral position with respect to the one side cam hole and has the other side cam hole with the cut edge wall portion as the cam surface, and a moving force in the rear direction. A first moving frame that supports the ball lens and a second moving frame that applies a moving force to the front direction are provided, and the cam follower of the first moving frame is moved to the cam surface of the one side cam hole of the cam barrel by the second movement. The cam followers of the frame are brought into contact with the cam surfaces of the other side cam holes, respectively, and the first and second moving frames are moved in conjunction with the rotation of the cam barrel to change the position of the lens supported by each of the moving frames. With a zoom lens barrel that is configured to optically change the The cam cylinder has a plate part provided with a cam surface parallel wall parallel to the cam surface so as to be the outer circumference of the one side cam hole and the other side cam hole or the outer circumference of the one direction side cam hole. We propose a cam barrel for a zoom lens barrel, characterized in that it is integrally formed and a wall parallel to the cam surface and a cam follower that is in contact with the cam surface are set at a small interval.
「作用」 本考案に係るカム筒は、前端より切り込み形成した一方
側カム孔と、後端から切り込み形成した他方側カム孔と
を備えると共に、これらカム孔の両方または一方側カム
孔にはカム面平行壁を形成した被板部を設けたので、合
成樹脂材などを使って型抜き加工することができ、ま
た、移動枠に引き出し手動力が加わると、カムフォロア
が被板部のカム面平行壁に当接し、移動枠の不用意な引
き出し移動が阻止される。[Operation] The cam barrel according to the present invention has one side cam hole formed by cutting from the front end and the other side cam hole formed by cutting from the rear end. Since the plate part with the plane parallel wall is provided, it is possible to perform die-cutting processing using a synthetic resin material, etc. Also, when the moving frame is pulled out and a manual force is applied, the cam follower makes the plate parallel to the cam face of the plate part. It abuts against the wall and prevents the moving frame from being unintentionally pulled out.
さらに、一方側カム孔と他方側カム孔とは筒周囲位置を
ずらして形成してあり、例えば、筒周囲に沿って設けた
複数の一方側カム孔に対して、他方側カム孔はこれら一
方側カム孔の各々の間に形成することができ、これよ
り、カム筒の筒軸方向の長さを充分に短縮させることが
でき、鏡胴長を可能なるかぎり短縮化したコンパクトな
ズームレンズ鏡胴の設計、生産に極めて有利となる。Further, the one-side cam hole and the other-side cam hole are formed so that the cylinder peripheral position is displaced, and for example, the other-side cam hole is one of the plurality of one-side cam holes provided along the cylinder periphery. A compact zoom lens mirror can be formed between each of the side cam holes, whereby the length of the cam barrel in the barrel axis direction can be sufficiently shortened and the barrel length can be shortened as much as possible. It is extremely advantageous for the design and production of the body.
「実施例」 次に、本考案の実施例について図面に沿って説明する。[Example] Next, an example of the present invention will be described with reference to the drawings.
第１図は本考案に係るカム筒を備えたズームレンズ鏡胴
の縦断側面図、第２図は同ズームレンズ鏡胴の横断平面
図、第３図は胴ズームレンズ鏡胴の分解斜視図である。FIG. 1 is a vertical sectional side view of a zoom lens barrel having a cam barrel according to the present invention, FIG. 2 is a cross-sectional plan view of the zoom lens barrel, and FIG. 3 is an exploded perspective view of the barrel zoom lens barrel. is there.
これらの図において、１１はカメラ本体などに取り付け
られる筒状の固定枠、１２は固定枠１１の外面を移動す
る移動筒、１３は固定枠１１内で移動する移動枠、１４
は移動筒１２の周囲に回動自在に設けたカム筒である。In these figures, 11 is a cylindrical fixed frame that is attached to the camera body, 12 is a moving cylinder that moves on the outer surface of the fixed frame 11, 13 is a moving frame that moves within the fixed frame 11, and 14 is a moving frame.
Is a cam cylinder rotatably provided around the movable cylinder 12.
また、Ｌ1は固定枠１１に支持させた固定レンズ群、
Ｌ2、Ｌ3は移動筒１２の先端と後端とに支持させた移動
レンズ群、Ｌ4は移動枠１３に支持させた移動レンズ群
であり、Ｌ2は合焦用レンズとして、Ｌ1、Ｌ3、Ｌ4は変
倍用レンズとして各々機能するが、特に、Ｌ4は補正用
レンズとして働く。L 1 is a fixed lens group supported by the fixed frame 11,
L 2 and L 3 are moving lens groups supported by the front and rear ends of the moving barrel 12, L 4 is a moving lens group supported by the moving frame 13, and L 2 is a focusing lens, L 1 , L 3 and L 4 each function as a variable power lens, and in particular, L 4 functions as a correction lens.
上記固定枠１１は、上方と下方とに光軸方向（筒軸方
向）に沿って細長く直線的に延びた案内溝１１ａ、１１
ｂと、その左方と右方には後端側を開放させた筒軸方向
に延びた幅広の切欠孔１１ｃ、１１ｄ（第２図、第３図
参照）とを備えている。案内溝１１ａ、１１ｂは移動筒
１２を光軸方向に非回動として案内し、切欠孔１１ｃ、
１１ｄは移動枠１３とレンズ支持枠１５とを筒軸方向に
移動可能にする切欠孔である。The fixed frame 11 has guide grooves 11a, 11 extending upward and downward linearly along the optical axis (cylindrical axis).
b, and left and right sides thereof are provided with wide cutouts 11c and 11d (see FIGS. 2 and 3) which are open at the rear end side and extend in the cylinder axis direction. The guide grooves 11a and 11b guide the movable barrel 12 in a non-rotatable manner in the optical axis direction, and the cutout holes 11c and 11c
Reference numeral 11d is a notch hole that allows the movable frame 13 and the lens support frame 15 to move in the cylinder axis direction.
そして、この固定枠１１の先端やや中寄りには中仕切状
のレンズ支持部１１ｅが一体に設けてあって、この支持
部１１ｅに固定レンズ群Ｌ1のレンズホルダー１６がね
じ止めしてある。なお、当接レンズ支持部１１ｅには弧
状の貫通孔１１ｆが設けてあるが、これには合焦用の移
動レンズ群Ｌ2の回動範囲を定めるための後述する移動
枠１３のストッパー杆１３ｃ、１３ｄが遊挿する。これ
については後述する。A lens support portion 11e in the form of a partition is integrally provided at the tip of the fixed frame 11 slightly in the middle, and the lens holder 16 of the fixed lens group L 1 is screwed to the support portion 11e. The contact lens support portion 11e is provided with an arc-shaped through hole 11f, which has a stopper rod 13c of a moving frame 13 which will be described later for determining the turning range of the moving lens group L 2 for focusing. , 13d is loosely inserted. This will be described later.
一方、上記固定枠１１の後端部には、第５図及び第６図
より分かる如く、取付板部１１ｇとの間に弧状凹形部１
１ｈ、１１ｉが対称的に設けてあり、さらに、これら凹
形部１１ｈ、１１ｉ各々の外壁にストッパー凸部１１
ｊ、１１ｋが、また、この外壁に続くように係止爪１１
、１１ｍが各々対称位置に設けてある。On the other hand, at the rear end of the fixed frame 11, as can be seen from FIGS. 5 and 6, the arcuate concave portion 1 is provided between the fixed frame 11 and the mounting plate portion 11g.
1h and 11i are provided symmetrically, and further, the stopper protrusion 11 is formed on the outer wall of each of the concave portions 11h and 11i.
j and 11k are also engaged with the locking claws 11 so as to continue to this outer wall.
, 11 m are provided at symmetrical positions.
係止爪１１、１１ｍは後述するカム筒をバヨネット構
造として取り付けるもので、ストッパー凸部１１ｊ、１
１ｋはカム筒の回動範囲を定めるものである。なお、第
５図は移動筒１２及びカム筒１４を省略して示した第１
図上のＡ−Ａ線縮小断面図で、第６図は固定枠１１の部
分的な斜視図である。The locking claws 11 and 11m are for attaching a cam cylinder, which will be described later, as a bayonet structure.
1k defines the turning range of the cam barrel. It should be noted that FIG. 5 shows the first cylinder without the moving cylinder 12 and the cam cylinder 14.
6 is a partial cross-sectional view of the fixed frame 11, which is a reduced cross-sectional view taken along the line AA in the figure.
上記した移動筒１２は、その上方と下方とにカムフォロ
ア１７ａ、１７ｂを、その左方と右方とに光軸方向に細
長く直線的に延びた案内孔１２ａ、１２ｂ（第２図参
照）とを備えている。The moving cylinder 12 has cam followers 17a and 17b above and below, and guide holes 12a and 12b (see FIG. 2) linearly elongated in the optical axis direction on its left and right sides. I have it.
カムフォロア１７ａ、１７ｂはピン状のローラーであっ
て、これらの移動筒内側にはキーカラー１８ａ、１８ｂ
が固着してあり、これらキーカラー１８ａ、１８ｂが固
定枠１１の案内溝１１ａ、１１ｂ内を移動する。また、
上記した案内孔１２ａ、１２ｂは後述する移動枠１３の
カムフォロアを案内するものである。The cam followers 17a and 17b are pin-shaped rollers, and the key collars 18a and 18b are provided inside the moving cylinders.
Are fixed, and these key collars 18a and 18b move in the guide grooves 11a and 11b of the fixed frame 11. Also,
The guide holes 12a and 12b described above guide the cam followers of the moving frame 13 described later.
また、この移動筒１２の先端部にはヘリコイドねじによ
って螺合させた回動筒１９を設け、この回動筒１９に移
動レンズ群Ｌ2のレンズホルダー２０がねじ止めしてあ
る。Further, a rotating barrel 19 screwed with a helicoid screw is provided at the tip of the moving barrel 12, and a lens holder 20 of the moving lens unit L 2 is screwed to the rotating barrel 19.
この回動筒１９には合焦用ピニオン２１と噛合させた歯
車１９ａが一体形成してあって、この回動により移動レ
ンズ群Ｌ2を位置変化させるようになっている。回動筒
１９はレンズホルダー２０より固定枠１１内部に向かっ
て突き出た旋回杆２２によって回動限界が定められる。A gear 19a meshed with the focusing pinion 21 is integrally formed on the rotating barrel 19, and the position of the moving lens unit L 2 is changed by this rotation. The turning limit of the turning barrel 19 is set by a turning rod 22 protruding from the lens holder 20 toward the inside of the fixed frame 11.
なお、合焦用ピニオン２１はカム筒１４のカム孔を通し
て移動筒１２に固定させた支持腕２３に設けて移動筒１
２と一体的に移動する構成としてある。The focusing pinion 21 is provided on the support arm 23 fixed to the moving barrel 12 through the cam hole of the cam barrel 14 and is attached to the moving barrel 1.
It is configured to move integrally with 2.
上記移動筒１２の後端部には、上記したレンズ支持枠１
５がねじ止めされ、この支持枠１５に移動レンズ群Ｌ3
のレンズホルダー２４がねじ止めしてある。At the rear end of the movable barrel 12, the lens support frame 1 described above is provided.
5 is screwed, and the moving lens group L 3 is attached to the support frame 15.
The lens holder 24 is fixed with screws.
レンズ支持枠１５は、第３図及び第７図に示した如く、
左右に円弧状の拡径部１５ａ、１５ｂを有する円盤状の
もので、これら拡径部１５ａ、１５ｂを固定枠１１の切
欠孔１１ｃ、１１ｄに遊挿させて移動筒１２の内周面に
嵌合させ、移動筒１２に設けた小孔１２ｃよりねじ込ん
だ小ねじ２５（第２図参照）によってブッシュを介して
固定してある。The lens support frame 15 is, as shown in FIGS. 3 and 7,
A disk-shaped member having circular arc-shaped enlarged diameter portions 15a and 15b on the left and right sides, and these enlarged diameter portions 15a and 15b are loosely inserted into the cutout holes 11c and 11d of the fixed frame 11 and fitted to the inner peripheral surface of the movable barrel 12. They are joined together and fixed via a bush by a small screw 25 (see FIG. 2) screwed into a small hole 12c provided in the moving barrel 12.
なお、第７図は第１図上のＡ−Ａ線縮小断面図である。Note that FIG. 7 is a reduced cross-sectional view taken along the line AA in FIG.
上記移動枠１３は、第３図の斜視図より分かる如く、左
右に形成した円弧形の拡径部と中央孔とを有する円盤状
のもので、各拡径部には円曲面部１３ａ、１３ｂを一体
形成し、これら円曲面部１３ａ、１３ｂにピン状のロー
ラーであるカムフォロア２６ａ、２６ｂが設けてある。As can be seen from the perspective view of FIG. 3, the movable frame 13 is a disk-shaped member having a circular arc-shaped expanded portion formed in the left and right and a central hole, and each expanded portion has a circular curved surface portion 13a, 13b are integrally formed, and cam followers 26a and 26b, which are pin-shaped rollers, are provided on the circular curved surface portions 13a and 13b.
また、この移動枠１３の円曲面部側の板面には円形のレ
ンズ支持枠２７をねじ止めし、この支持枠２７の中央部
に移動レンズ群Ｌ4のレンズホルダー部２８が設けてあ
る。A circular lens support frame 27 is screwed to the plate surface of the movable frame 13 on the side of the circular curved surface, and a lens holder portion 28 of the movable lens group L 4 is provided at the center of the support frame 27.
上記構成の移動枠１３は第１図及び第２図より分かる通
り、円曲面部１３ａ、１３ｂを固定枠１１の切欠孔１１
ｃ、１１ｄに遊挿させると共に、カムフォロア２６ａ、
２６ｂを移動筒１２の案内孔１２ａ、１２ｂに嵌合させ
摺動自在に通してカム筒１４のカム面に対接させてあ
る。As can be seen from FIG. 1 and FIG. 2, the movable frame 13 having the above-described structure has the circular curved surface portions 13 a and 13 b and the cutout hole 11 of the fixed frame 11.
The cam followers 26a,
26b is fitted into the guide holes 12a and 12b of the movable barrel 12 and slidably inserted so as to be in contact with the cam surface of the cam barrel 14.
一方、移動枠１３には第３図の斜視図に示すように、光
軸方向に平行に張り出した２本のストッパー杆１３ｃ、
１３ｄが設けてある。これらストッパー杆１３ｃ、１３
ｄは固定枠１１のレンズ支持部１１ｅに設けた弧状の貫
通孔１１ｆを通り貫け、移動レンズ群Ｌ2の回動範囲を
定める旋回杆２２の旋回領域に突出し、この旋回杆２２
が所定の範囲で旋回したとき当接するようになってい
る。また、この移動枠１３に固着したレンズ支持枠２７
と移動筒１２に固定したレンズ支持枠１５との間に拡圧
作用のコイルばね３０を設け、移動枠１３を第１図及び
第２図上左方向に、移動筒１２を同図上右方向に常時押
動するばね勢力が与えてある。On the other hand, on the moving frame 13, as shown in the perspective view of FIG. 3, two stopper rods 13c extending in parallel with the optical axis direction,
13d is provided. These stopper rods 13c, 13
d is Tsuranuke through an arcuate through hole 11f formed in the lens supporting portion 11e of the fixed frame 11 protrudes turning area of the turning rod 22 defining the rotation range of the moving lens group L 2, the pivot rod 22
The abutting contact is made when the vehicle turns within a predetermined range. Further, the lens support frame 27 fixed to the moving frame 13
And a lens support frame 15 fixed to the movable barrel 12, a coil spring 30 for expanding the pressure is provided, the movable frame 13 is moved leftward in FIGS. 1 and 2, and the movable barrel 12 is moved rightward in FIG. The spring force that constantly pushes is given to.
なお、本実施例では、移動枠１３とレンズ支持枠２７と
の間に僅かな空間を形成するようになっており、この空
間にシヤッタ羽根（図示省略）を組み込む。In this embodiment, a slight space is formed between the moving frame 13 and the lens support frame 27, and a shutter blade (not shown) is incorporated in this space.
シヤッタ駆動装置は図示仮線２９で示したように円曲面
部１３ａ、１３ｂの内側に位置させるようにして上記レ
ンズ支持枠２７に取り付ける。The shutter drive device is attached to the lens support frame 27 so as to be positioned inside the circular curved surface portions 13a and 13b as shown by a phantom line 29 in the figure.
上記したカム筒１４は、第３図の斜視図より分かる通
り、前側に設けた一方側カム孔３１、３２と後側に設け
た他方側カム孔３３、３４とを備えた筒状体で、一方側
カム孔３１、３２を被うほぼ三角形状の被板部１４ａ、
１４ｂが径方向に形成型が摺動してカム筒１４の周囲に
一体に形成してある。そして、被板部１４ａ、１４ｂに
はカム面３１ａ、３２ａに平行させたカム面平行壁１４
ａ1、１４ｂ1が形成してある。As can be seen from the perspective view of FIG. 3, the above-mentioned cam barrel 14 is a tubular body having one side cam holes 31, 32 provided on the front side and the other side cam holes 33, 34 provided on the rear side, A substantially triangular plate-like portion 14a covering the one-side cam holes 31, 32,
The forming die slides 14b in the radial direction and is integrally formed around the cam cylinder 14. And, the cam surface parallel wall 14 parallel to the cam surfaces 31a and 32a is provided on the plate portions 14a and 14b.
a 1 and 14 b 1 are formed.
第４図は上記カム筒１４の展開図を示し、この図に示す
ように、一方側カム孔３１、３２は筒状体一端の上下部
所から筒軸方向に切り込み形成した切欠孔からなり、そ
の直線的な切り込み傾斜辺３１ａ、３２ａがカム面をな
し、他方側カム孔３３、３４は筒状体他端の左右部所か
ら筒軸方向に切り込み形成した切欠孔からなり、その曲
線的な傾斜辺３３ａ、３４ａがカム面を形成している。FIG. 4 is a development view of the cam cylinder 14, and as shown in the drawing, the one-side cam holes 31 and 32 are notched holes formed in the cylinder axial direction from the upper and lower portions of one end of the cylindrical body, The linear cut sloped sides 31a, 32a form a cam surface, and the other side cam holes 33, 34 are notched holes formed by cutting in the cylinder axis direction from the left and right portions of the other end of the cylindrical body, and have a curved shape. The inclined sides 33a and 34a form a cam surface.
そして、このカム筒１４には、一方側カム孔３１、３２
を被うようにした被板部１４ａ、１４ｂがカム筒１４の
外周に一体に形成してあり、他方側カム孔３３、３４に
ついてはフランジ部１４ｃ、１４ｄがカム筒１４の後端
外周に一体形成してある。上記した被板部１４ａ、１４
ｂはほぼ三角形状をなし、その斜辺部がカム面３１ａ、
３２ａに平行にしたカム面平行壁１４ａ1、１４ｂ1を形
成している。このカム面平行壁１４ａ1、１４ｂ1は第８
図に示した如く、カム面３１ａ、３２ａに比べて筒周囲
方向に拡径としてカムフォロア１７ａ、１７ｂの頭部が
当接できる位置となっている。なお、カム面平行壁１４
ａ1とカムフォロア１７ａとの間及びカム面平行壁１４
ｂ1とカムフォロア１７ｂとの間に僅かな間隔を設け、
通常時にはカムフォロア１７ａ、１７ｂがこれらカム面
平行壁１４ａ1、１４ｂ1に接触しないようにする。例え
ば、カム面平行壁とカムフォロアとの間は第８図のΔＸ
で示すように０〜０．２mmに定める。また、カム面平行
壁とカムフォロアとの間隔ΔＸは、第９図に示したよう
に、カムフォロアの止めねじの頭部径を適当に定めて調
整するようにしてもよい。このようにすると、カム面平
行壁の全長にわたってΔＸを極力“０”に近づけること
が可能になって有利である。The cam barrel 14 has one side cam holes 31, 32.
Plate portions 14a, 14b that cover the cam cylinder 14 are integrally formed on the outer circumference of the cam cylinder 14, and the flange portions 14c, 14d of the other side cam holes 33, 34 are integrally formed on the outer circumference of the rear end of the cam cylinder 14. Has been formed. The plate portions 14a, 14 described above
b has a substantially triangular shape, and the hypotenuse thereof is the cam surface 31a,
The cam surface parallel walls 14a 1 and 14b 1 which are parallel to 32a are formed. The cam surface parallel walls 14a 1 and 14b 1 are the eighth
As shown in the drawing, the heads of the cam followers 17a and 17b are in a position where the heads of the cam followers 17a and 17b can come into contact with each other by expanding the diameter in the cylinder circumferential direction as compared with the cam surfaces 31a and 32a. The cam surface parallel wall 14
a 1 and the cam follower 17 a and the cam surface parallel wall 14
A small gap is provided between b 1 and the cam follower 17b,
Normally, the cam followers 17a and 17b are prevented from coming into contact with the cam surface parallel walls 14a 1 and 14b 1 . For example, between the cam surface parallel wall and the cam follower, ΔX in FIG.
Set to 0 to 0.2 mm as shown in. Further, as shown in FIG. 9, the gap ΔX between the cam surface parallel wall and the cam follower may be adjusted by appropriately setting the head diameter of the set screw of the cam follower. This is advantageous because ΔX can be made as close as possible to “0” over the entire length of the cam surface parallel wall.
一方、上記カム筒１４にはその後端よりやや中寄りの周
囲に歯車部１４ｅが設けてあって、ズーミング用ピニオ
ン３５が第１図に示すように噛合させてある。ズーミン
グ用ピニオン３５は固定枠１１の取付板部１１ｇに支持
させてある。On the other hand, the cam barrel 14 is provided with a gear portion 14e around the rear end of the cam barrel 14 slightly, and a zooming pinion 35 is meshed as shown in FIG. The zooming pinion 35 is supported by the mounting plate portion 11g of the fixed frame 11.
上記カム筒１４はフランジ部１４ｃ、１４ｄを固定枠１
１の係止爪１１、１１ｍに係止させるように弧状凹形
部１１ｈ、１１ｉに嵌合させ、既に述べたように、バヨ
ネット形式で固定枠１１に取り付けるが、このカム筒１
４の後方周囲に一体に設けた凸状部１４ｆ、１４ｇを上
記係止爪１１、１１ｍの表面に接合させるようにして
カム筒１４の筒軸方向の位置が定められる。The cam cylinder 14 has the flange portions 14c and 14d fixed to the fixed frame 1.
1 is fitted to the arcuate concave portions 11h and 11i so as to be locked to the locking claws 11 and 11m, and is attached to the fixed frame 11 in the bayonet form as described above.
The position of the cam cylinder 14 in the cylinder axis direction is determined by joining the convex portions 14f and 14g integrally provided on the rear periphery of the cam cylinder 4 to the surfaces of the locking claws 11 and 11m.
なお、第４図に仮線で示したように、上記した一方側カ
ム孔３１、３２のカム面３１ａ、３２ａには移動筒１２
のカムフォロア１７ａ、１７ｂが対接し、他方側カム孔
３３、３４のカム面３３ａ、３４ａには移動枠１３のカ
ムフォロア２６ａ、２６ｂが対接するように組み付け
る。一方側カム孔３１内にカムフォロア１７ａと共に示
した円形仮線は上記したところの合焦用ピニオン２１の
支持腕２３である。As indicated by a phantom line in FIG. 4, the moving barrel 12 is provided on the cam surfaces 31a and 32a of the one-side cam holes 31 and 32 described above.
The cam followers 17a and 17b of the moving frame 13 are attached to each other, and the cam followers 26a and 26b of the moving frame 13 are attached to the cam surfaces 33a and 34a of the other side cam holes 33 and 34, respectively. The circular temporary line shown together with the cam follower 17a in the one side cam hole 31 is the support arm 23 of the focusing pinion 21 as described above.
上記したズームレンズ鏡胴を組み立てるに際しては、移
動枠１３とレンズ支持枠１５とをコイルばね３０を介在
させながら固定枠１１に内装させた後に、移動筒１２を
固定枠１１の外周に嵌め合せて、この移動筒１２にレン
ズ支持枠１５を小ねじ２５によって固着する。When assembling the zoom lens barrel described above, the movable frame 13 and the lens support frame 15 are housed in the fixed frame 11 with the coil spring 30 interposed therebetween, and then the movable barrel 12 is fitted to the outer periphery of the fixed frame 11. The lens support frame 15 is fixed to the moving barrel 12 with machine screws 25.
次に、カム筒１４を移動筒１２の外周に嵌め合せるが、
この場合、第５図に二点鎖線をもって示したように、フ
ランジ部１４ｃがストッパー凸部１１ｋと係止爪１１
との間に、フランジ部１４ｄがストッパー凸部１１ｊと
係止爪１１ｍとの間になるようにしてカム筒１４の後端
部を固定枠１１の弧状凹形部１１ｈ、１１ｉに差し入
れ、引き続いてカム筒１４を左回動する。Next, the cam cylinder 14 is fitted on the outer periphery of the movable cylinder 12,
In this case, as shown by the chain double-dashed line in FIG. 5, the flange portion 14c includes the stopper protrusion 11k and the locking claw 11.
, The rear end of the cam barrel 14 is inserted into the arcuate concave portions 11h and 11i of the fixed frame 11 so that the flange portion 14d is located between the stopper convex portion 11j and the locking claw 11m. The cam barrel 14 is rotated counterclockwise.
この操作でフランジ部１４ｃが係止爪１１の下側に、
フランジ部１４ｄが係止爪１１ｍの下側に入り込み、各
フランジ部１４ｃ、１４ｄが係止される状態となる。By this operation, the flange portion 14c is below the locking claw 11,
The flange portion 14d enters the lower side of the locking claw 11m, and the flange portions 14c and 14d are locked.
このように係止させた後に、各々ストッパー凸部１１
ｊ、１１ｋに接近させてストッパー片３６ａ、３６ｂを
固着し、各フランジ部１４ｃ、１４ｄの抜け出しを防止
する。なお、ストッパー片３６ａ、３６ｂは弧状凹形部
１１ｈ、１１ｉの外壁面にねじ、接着剤等で固定する。After locking in this way, each stopper protrusion 11
The stopper pieces 36a and 36b are fixed close to j and 11k to prevent the flange portions 14c and 14d from coming off. The stopper pieces 36a, 36b are fixed to the outer wall surfaces of the arcuate concave portions 11h, 11i with screws, adhesives or the like.
上記の如く取り付けられたカム筒１４は、第７図によっ
て分かる通り、フランジ部１４ｃがストッパー凸部１１
ｊとストッパー片３６ａの間で、フランジ部１４ｄがス
トッパー凸部１１ｋとストッパー片３６ｂとの間で各々
回動するようになってその回動範囲が定められる。As can be seen from FIG. 7, in the cam cylinder 14 attached as described above, the flange portion 14c has the stopper protrusion 11
Between the j and the stopper piece 36a, the flange portion 14d is rotated between the stopper convex portion 11k and the stopper piece 36b, and the rotation range is defined.
カムフォロア１７ａ、１７ｂ及び２６ａ、２６ｂはカム
筒１４を取り付けてから移動筒１２と移動枠１３との各
々に固着すると共に回動筒１９を移動筒１２に螺合させ
るように組み立てる。The cam followers 17a, 17b and 26a, 26b are assembled so that the cam barrel 14 is attached and then fixed to each of the moving barrel 12 and the moving frame 13 and the rotating barrel 19 is screwed into the moving barrel 12.
次に、上記したズームレンズ鏡胴の動作について説明す
る。Next, the operation of the zoom lens barrel described above will be described.
なお、移動筒１２が押し戻された第１図及び第２図に示
す広角状態にあると仮定すれば、各カムフォロア１７
ａ、１７ｂ、２６ａ、２６ｂはカム筒１４に対して第４
図に示す対接関係となっている。ズーム操作のためスイ
ッチを投入すると、モータの回転によってズーミング用
ピニオン３５が駆動される。これより、このピニオン３
５に連動されたカム筒１４が正面（第１図上左側）から
見て右回動し、これより、カムフォロア１７ａ、１７ｂ
が一方側カム孔３１、３２のカム面３１ａ、３２ａに押
動され、移動筒１２がコイルばね３０の拡圧作用に抗し
て第１図及び第２図上左方向に移動する。また、カムフ
ォロア２６ａ、２６ｂはコイルばね３０の押動勢力を受
けて他方側カム孔３３、３４のカム面３３ａ、３４ａの
回動にしたがって光軸方向に移動し、このことから、移
動枠１３が第１図及び第２図上左方向に移動する。Assuming that the movable barrel 12 is pushed back and is in the wide-angle state shown in FIGS. 1 and 2, each cam follower 17 is moved.
a, 17b, 26a, 26b are fourth with respect to the cam barrel 14.
The contact relationship shown in the figure is established. When the switch is turned on for the zoom operation, the zooming pinion 35 is driven by the rotation of the motor. From this, this pinion 3
The cam barrel 14 which is interlocked with 5 rotates rightward when viewed from the front (left side in FIG. 1), from which the cam followers 17a, 17b
Is pushed by the cam surfaces 31a, 32a of the one-sided cam holes 31, 32, and the movable barrel 12 moves in the leftward direction in FIGS. 1 and 2 against the pressure expanding action of the coil spring 30. Further, the cam followers 26a, 26b receive the pushing force of the coil springs 30 and move in the optical axis direction as the cam surfaces 33a, 34a of the other side cam holes 33, 34 rotate, whereby the moving frame 13 moves. It moves to the upper left in FIGS. 1 and 2.
上記の移動過程では、カムフォロア１７ａ、１７ｂと一
体的となっているキーカラー１８ａ、１８ｂが固定枠１
１の案内溝１１ａ、１１ｂに案内され、移動筒１２が固
定枠１１とカム筒１４との間を非回動のまま移動し、ま
た、この移動筒１２の先端に螺合した回動筒１９の歯車
１９ａは合焦用ピニオン２１と噛合した状態で左方向に
移動する。移動枠１３は、カムフォロア２６ａ、２６ｂ
か移動筒１２の案内孔１２ａ、１２ｂが案内され、固定
枠１１内を非回動のまま左方向に摺動し、その円曲面部
１３ａ、１３ｂが固定枠１１の切欠孔１１ｃ、１１ｄ内
を移動する。During the above movement process, the key collars 18a and 18b, which are integrated with the cam followers 17a and 17b, are fixed to the fixed frame 1.
1 is guided by the guide grooves 11a and 11b, the movable barrel 12 moves between the fixed frame 11 and the cam barrel 14 without rotating, and the rotating barrel 19 screwed to the tip of the movable barrel 12. The gear 19a moves to the left while meshing with the focusing pinion 21. The moving frame 13 includes cam followers 26a and 26b.
The guide holes 12a and 12b of the movable barrel 12 are guided to slide to the left in the fixed frame 11 while not rotating, and the circular curved surface portions 13a and 13b are guided in the cutout holes 11c and 11d of the fixed frame 11. Moving.
カム筒１４の回動に伴って、そのフランジ部１４ｃ、１
４ｄが第７図上右旋し、カム筒１４が所定の回動位置に
達すると、これらフランジ部１４ｃ、１４ｄの端部がス
トッパー片３６ａ、３６ｂに突き当りカム筒１４が回動
が停止する。As the cam barrel 14 rotates, its flange portions 14c, 1
When 4d turns right in FIG. 7 and the cam cylinder 14 reaches a predetermined rotation position, the ends of the flange portions 14c and 14d hit the stopper pieces 36a and 36b, and the rotation of the cam cylinder 14 is stopped.
これより、ズーミング用ピニオン３５を駆動するモータ
が過負荷となり、この過負荷を検出したスイッチがモー
タの給電を遮断する。As a result, the motor that drives the zooming pinion 35 becomes overloaded, and the switch that detects this overload shuts off the power supply to the motor.
第１０図は上記したズーミングによって広角位置から望
遠位置に移行した状態を示す。この図から分かる如く、
移動レンズ群Ｌ２、Ｌ３は移動筒１２の移動によって一
緒に変位し、これらの移動距離が同じものとなるが、移
動枠１３の移動によって変位した移動レンズ群Ｌ４は独
自に変位し、上記移動レンズ群Ｌ２、Ｌ３に比べて少な
い移動距離となる。FIG. 10 shows a state in which the zoom lens is moved from the wide-angle position to the telephoto position. As you can see from this figure,
The moving lens groups L 2 and L 3 are displaced together by the movement of the moving barrel 12 and have the same moving distance, but the moving lens group L 4 displaced by the movement of the moving frame 13 is independently displaced, The moving distance is smaller than that of the moving lens groups L 2 and L 3 .
移動レンズ群Ｌ４の移動はカム筒１４に設けた他方側カ
ム孔３３、３４のカム面３３ａ、３４ａの形状を変える
ことで任意に定めることができるが、実際には、関数的
な条件によって移動距離が定まるように上記カム面３３
ａ、３４ａを形成する。一方、合焦用ピニオン２１は自
動測距機構に含むモータによって駆動され、回動筒１９
をヘリコイドねじにしたがって回動する。この回動筒１
９の回動は移動レンズ群Ｌ２のみの位置を光軸方向に変
位させて合焦制御する。The movement of the moving lens unit L 4 can be arbitrarily determined by changing the shapes of the cam surfaces 33a and 34a of the other side cam holes 33 and 34 provided in the cam barrel 14, but in practice, depending on the functional conditions. The cam surface 33 is set so that the moving distance is determined.
a and 34a are formed. On the other hand, the focusing pinion 21 is driven by a motor included in the automatic distance measuring mechanism,
Rotate according to the helicoid screw. This rotating cylinder 1
The rotation of 9 displaces only the position of the moving lens unit L 2 in the optical axis direction to control focusing.
また、回動筒１９が所定の回動位置に達したとき、旋回
杆２２がストッパー杆１３ｃ、１３ｄのいづれか一方に
突き当り、回動筒１９の回動が停止される。When the rotary cylinder 19 reaches a predetermined rotary position, the rotary rod 22 abuts either one of the stopper rods 13c and 13d, and the rotary barrel 19 is stopped from rotating.
これより、合焦用ピニオン２１を駆動するモータが過負
荷となり、この過負荷を検出したスイッチがモータを停
止し、或いは、このモータを逆転制御する。As a result, the motor that drives the focusing pinion 21 becomes overloaded, and the switch that detects this overload stops the motor or reversely controls this motor.
望遠位置から広角位置へ移行させる場合には、ズーミン
グ用ピニオン３５を上記とは逆方向に回転駆動する。こ
の回転駆動により、カムフォロア１７ａ、１７ｂがコイ
ルばね３０の拡圧勢力を受けて一方側カム孔３１、３２
のカム面３１ａ、３２ａにしたがい第１０図上右方向に
移動すると共に、カムフォロア２６ａ、２６ｂが他方側
カム孔３３、３４のカム面３３ａ、３４ａに押動されて
同方向に移動し、移動筒１２及び移動枠１３が第１図及
び第２図に示す動作状態となる。When shifting from the telephoto position to the wide-angle position, the zooming pinion 35 is rotationally driven in the opposite direction to the above. By this rotational drive, the cam followers 17a and 17b receive the expanding force of the coil spring 30 and the one-side cam holes 31 and 32.
10, the cam followers 26a, 26b are pushed by the cam surfaces 33a, 34a of the other side cam holes 33, 34 to move in the same direction, and move in the same direction. 12 and the moving frame 13 are in the operating state shown in FIG. 1 and FIG.
以上、本考案に係るカム筒の一実施例について説明した
が、一方側カム孔３１、３２と他方側カム孔３３、３４
の個数などは任意に増減することができ、また、これら
カム孔３１〜３４を橋絡する被板部１４ａ、１４ｂとフ
ランジ部１４ｃ、１４ｄはカム筒１４の真円度を確保す
る上に有利となるものであるから、一方側カム孔３１、
３２を被う被板部１４ａ、１４ｂについてはこれらを連
続形成し筒周囲全体に設けるようにしてもよい。さら
に、第１１図及び第１２図に示したように、カム面平行
壁１４ａ1、１４ｂ1を形成した被板部１４ａ、１４ｂを
四辺形に引き延し形成してもよい。Although the embodiment of the cam barrel according to the present invention has been described above, the cam holes 31, 32 on the one side and the cam holes 33, 34 on the other side are described.
The number and the like of the cams can be arbitrarily increased or decreased, and the plate portions 14a and 14b and the flange portions 14c and 14d bridging the cam holes 31 to 34 are advantageous for ensuring the roundness of the cam cylinder 14. Therefore, one side cam hole 31,
The plate portions 14a and 14b covering 32 may be continuously formed and provided around the entire cylinder. Further, as shown in FIGS. 11 and 12, the plate portions 14a and 14b formed with the cam surface parallel walls 14a 1 and 14b 1 may be formed in a quadrangular shape by extending.
合成樹脂材の成形条件によってはカム筒１４の真円度を
確保するために極力カム孔３１〜３４の切欠面積を減ら
すことが有利となるから、フランジ部１４ｃ、１４ｄの
幅（筒軸方向の幅）を拡張し、上記被板部１４ａ、１４
ｂ同様のものを他方側カム孔３３、３４に設けてもよ
い。Depending on the molding conditions of the synthetic resin material, it is advantageous to reduce the notch area of the cam holes 31 to 34 as much as possible in order to secure the roundness of the cam cylinder 14, so that the width of the flange portions 14c and 14d (in the cylinder axis direction). (Width) is expanded, and the plate portions 14a, 14
You may provide the thing similar to b in the cam holes 33 and 34 of the other side.
さらに、上記実施例のカム筒１４は、ズーミング用ピニ
オン３５を噛合させる歯車部１４ｅを設けた関係で、一
方側カム孔３１、３２の形成領域よりかなり長い筒長と
なっているが、このような歯車部１４ｅを設けない場合
には、上記カム孔３１、３２の形成領域に比べて多少長
い筒長のカム筒として実施することができ、カム筒１４
の筒軸方向の長さを極力短縮し得る。Further, the cam cylinder 14 of the above-described embodiment has a cylinder length considerably longer than the formation region of the one side cam holes 31 and 32 due to the provision of the gear portion 14e for meshing the zooming pinion 35. If the gear portion 14e is not provided, it can be implemented as a cam cylinder having a cylinder length slightly longer than the area where the cam holes 31 and 32 are formed.
The length of the cylinder in the cylinder axis direction can be shortened as much as possible.
特に、カム筒１４は型抜き形成することができて有利で
ある。例えば、このカム筒１４は筒軸方向と筒周囲方向
に型抜きする形成型によって容易に生産することができ
るので、合成樹脂材などの資材を使用したローコストの
組み込み易いカム筒となる。Particularly, the cam barrel 14 can be formed by die cutting, which is advantageous. For example, the cam cylinder 14 can be easily produced by a forming die that is die-cut in the cylinder axis direction and the cylinder peripheral direction, so that the cam cylinder is made of a material such as a synthetic resin material and can be easily incorporated at low cost.
また、本考案のカム筒は、直線的に移動する光学径と、
非直線的に移動する光学系とを変位するカム筒に達する
から、マスターレンズと合焦用レンズとを固定し、これ
らレンズの間で変倍用レンズと補正用レンズとを移動さ
せる構成の従来から広く知られているズームレンズ鏡胴
についても容易に実施することができる。Further, the cam barrel of the present invention has an optical diameter that moves linearly,
Since it reaches the cam barrel that displaces the non-linearly moving optical system, the master lens and the focusing lens are fixed, and the zoom lens and the correction lens are moved between these lenses. It can be easily implemented for a zoom lens barrel that is widely known from.
本考案は写真撮影用のカメラにかぎらず、小形撮影機
や、ビデオカメラなどのズームレンズ鏡胴のカム筒とし
て利用することができる。INDUSTRIAL APPLICABILITY The present invention can be used not only as a camera for taking photographs, but also as a cam barrel of a zoom lens barrel such as a compact photographing device or a video camera.
なお、上記実施例のズームレンズ鏡胴をビデオカメラ用
として利用する場合には、移動枠１３とレンズ支持枠２
７との間の空間にはシヤッタ羽根に換えて絞り羽根を設
ければよい。When the zoom lens barrel of the above embodiment is used for a video camera, the moving frame 13 and the lens support frame 2 are used.
A diaphragm blade may be provided instead of the shutter blade in a space between the shutter blade 7 and the shutter blade 7.
また、本考案はピニオン３５に連動させた自動ズーミン
グ制御機構、ピニオン２１に連動させた自動合焦制御機
構とすることなく、カム筒１４または回動筒１９を手動
操作するズームレンズ鏡胴として実施してもよい。Further, the present invention is implemented as a zoom lens barrel in which the cam barrel 14 or the rotating barrel 19 is manually operated without the automatic zooming control mechanism linked to the pinion 35 and the automatic focusing control mechanism linked to the pinion 21. You may.
「考案の効果」 上記した通り、本考案に係るカム筒は、筒状体の前端か
ら筒軸方向に切り込み形成した形状の一方側カム孔と、
上記一方側カム孔に対して筒周囲位置をずらせた他方側
カム孔とを備え、かつ、一方側カム孔と他方側カム孔と
の外周囲または一方側カム孔の外周囲となるように被板
部を設けて、この被板部にカムフォロアに接地させたカ
ム面平行壁を形成する構成としたので、前玉レンズを支
持させた移動枠が手動力で前方向に引き出されるような
場合には、カムフォロアがカム面平行壁に突き当るた
め、移動枠が手指などによって加わる手動力で不用意に
移動したりすることがなく、また、カム筒の筒軸方向の
長さが短縮されるので、鏡銅長さを縮小化するズームレ
ンズ鏡銅の設計、生産に極めて有利となる。"Effect of the Invention" As described above, the cam cylinder according to the present invention has one side cam hole formed by cutting in the axial direction of the cylinder from the front end of the cylindrical body,
The other side cam hole whose cylinder peripheral position is displaced from the one side cam hole is provided, and the outer circumference of the one side cam hole and the other side cam hole or the outer circumference of the one side cam hole is covered. Since a plate part is provided and a cam surface parallel wall grounded to the cam follower is formed on this plate part, when the moving frame supporting the front lens is pulled forward by manual force. Since the cam follower hits the wall parallel to the cam surface, the moving frame does not move carelessly by manual force applied by fingers, etc., and the length of the cam cylinder in the cylinder axis direction is shortened. , Zoom lens that reduces the mirror copper length, which is extremely advantageous for the design and production of mirror copper.
特に、上記したカム筒はズームレンズ鏡胴の他の各部品
と共に型抜き形成することができるから、組み込み易
く、コストの低廉化したズームレンズ鏡胴の提供が可能
になる。In particular, since the above-mentioned cam barrel can be formed by die-cutting together with other components of the zoom lens barrel, it is possible to provide a zoom lens barrel which is easy to assemble and whose cost is low.
図面は本考案の実施例を示し、第１図はズームレンズ鏡
胴の縦断側面図、第２図は同ズームレンズ鏡同の横断平
面図、第３図は同ズームレンズ鏡胴の分解斜視図、第４
図はカム筒の展開図、第５図は移動筒とカム筒を省略し
た第１図上のＡ−Ａ線縮小断面図、第６図は固定枠の部
分的な斜視図、第７図は第１図上のＡ−Ａ線縮小断面
図、第８図はカムフォロア部分を拡大して示した第１図
上の部分的な拡大図、第９図は変形例を示す第８図同様
の拡大図、第１０図は広角位置から望遠位置に移行した
状態を示す上記ズームレンズ鏡胴の縦断側面図、第１１
図は他の実施例を示す第４図同様のカム筒の展開図、第
１２図は第１１図に示すカム筒を組付けた状態のカムフ
ォロア部分を示す第８図同様の拡大図である。 １１……固定枠 １１ａ、１１ｂ……案内溝 １１ｃ、１１ｄ……切欠孔 １２……移動筒 １２ａ、１２ｂ……案内孔 １３……移動枠 １３ａ、１３ｂ……円曲面部 １４……カム筒 １４ａ、１４ｂ……被板部 １４ａ1、１４ｂ1……カム面平行壁 １４ｃ、１４ｄ……フランジ部 １４ｅ……歯車部 １７ａ、１７ｂ……カムフォロア ２６ａ、２６ｂ……カムフォロア ３１、３２……一方側カム孔 ３３、３４……他方側カム孔FIG. 1 shows an embodiment of the present invention. FIG. 1 is a vertical sectional side view of a zoom lens barrel, FIG. 2 is a cross-sectional plan view of the zoom lens barrel, and FIG. 3 is an exploded perspective view of the zoom lens barrel. , 4th
FIG. 5 is a developed view of the cam barrel, FIG. 5 is a sectional view taken along the line AA in FIG. 1 in which the moving barrel and the cam barrel are omitted, FIG. 6 is a partial perspective view of the fixed frame, and FIG. Fig. 1 is a sectional view taken along the line AA in Fig. 1, Fig. 8 is a partially enlarged view of Fig. 1 showing an enlarged cam follower portion, and Fig. 9 is an enlarged view similar to Fig. 8 showing a modified example. FIG. 10 and FIG. 10 are longitudinal side views of the zoom lens barrel showing a state in which the zoom lens is moved from the wide-angle position to the telephoto position.
FIG. 12 is a development view of a cam cylinder similar to FIG. 4 showing another embodiment, and FIG. 12 is an enlarged view similar to FIG. 8 showing a cam follower portion in a state where the cam cylinder shown in FIG. 11 is assembled. 11 ... Fixed frame 11a, 11b ... Guide groove 11c, 11d ... Notch hole 12 ... Moving barrel 12a, 12b ... Guide hole 13 ... Moving frame 13a, 13b ... Circular curved surface portion 14 ... Cam barrel 14a , 14b ... Plated parts 14a 1 , 14b 1 ... Cam surface parallel walls 14c, 14d ... Flange part 14e ... Gear parts 17a, 17b ... Cam followers 26a, 26b ... Cam followers 31, 32 ... One side cam Holes 33, 34 ... Cam holes on the other side
───────────────────────────────────────────────────── フロントページの続き (72)考案者 松尾 栄樹 長野県岡谷市長地2800番地 京セラ株式会 社長野岡谷工場内 (72)考案者 新沢 二三男 東京都渋谷区神宮前６丁目27番８号 京セ ラ株式会社東京原宿事業所内 (56)参考文献 特開 昭49−74934（ＪＰ，Ａ) 実開 昭57−14113（ＪＰ，Ｕ) 実開 昭49−137536（ＪＰ，Ｕ) 実開 昭62−30221（ＪＰ，Ｕ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Eiki Matsuo 2800 Nagachi, Okaya City, Nagano Kyocera Stock Company President, Nookaya Plant (72) Creator Fumio Niizawa 6-27-8, Jingumae, Shibuya-ku, Tokyo Kyocera Tokyo Harajuku office (56) References JP-A-49-74934 (JP, A) Actual-open Sho-57-14113 (JP, U) Actual-open Sho-49-137536 (JP, U) Actual-open Sho-62-30221 (JP, U)
Claims (1)
した形状で、切り込み縁壁部をカム面とした一方側カム
孔と、その後端から筒軸方向に切り込み形成した形状を
なし、上記一方側カム孔に対して筒周囲位置を変えて形
成し、切り込み縁壁部をカム面とした他方側カム孔とを
有するカム筒と、後方向に移動勢力を与えるようにして
前玉レンズを支持させた第１移動枠と、前方向に移動勢
力を与えた第２移動枠とを備え、第１移動枠のカムフォ
ロアをカム筒の一方側カム孔のカム面に、第２移動枠の
カムフォロアをその他方側カム孔のカム面に各々対接さ
せ、これら第１、第２移動枠をカム筒の回動に連動させ
て移動させ、移動枠各々に支持させたレンズの位置変化
により光学的に変倍する構成のズームレンズ鏡胴におい
て、上記したカム筒には、一方側カム孔と他方側カム孔
の外周囲または一方側カム孔の外周囲になるようにし
て、カム面と平行させたカム面平行壁を設けた被板部を
一体形成し、カム面平行壁とカム面に対接したカムフォ
ロアとを少ない間隔に設定する構成としたことを特徴と
するズームレンズ鏡胴のカム筒。1. A shape formed by cutting from a front end of a cylindrical body in a cylinder axis direction, wherein one side cam hole having a cut edge wall portion as a cam surface and a shape cut from the rear end in the cylinder axis direction are formed. A cam cylinder having different cam peripheral positions with respect to the one-side cam hole and having the other-side cam hole having a cut edge wall portion as a cam surface, and a front lens for giving a moving force to the rear direction. Is provided, and a second moving frame that gives a moving force in the forward direction. The cam follower of the first moving frame is attached to the cam surface of the cam hole on one side of the cam barrel. The cam followers are brought into contact with the cam surfaces of the other side cam holes, respectively, and the first and second moving frames are moved in association with the rotation of the cam barrel, and the optical movement is achieved by changing the position of the lens supported by each moving frame. In the zoom lens barrel configured to dynamically change the magnification, the above-mentioned cam Is integrally formed with a plate portion provided with a cam surface parallel wall parallel to the cam surface so as to be the outer periphery of the one side cam hole and the other side cam hole or the one side cam hole. A cam barrel for a zoom lens barrel, comprising a parallel wall of the cam surface and a cam follower that is in contact with the cam surface with a small interval.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987004353U JPH0614175Y2 (en) | 1987-01-14 | 1987-01-14 | Cam barrel of zoom lens barrel |
| US07/102,102 US4834514A (en) | 1986-09-30 | 1987-09-29 | Zoom lens mount assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987004353U JPH0614175Y2 (en) | 1987-01-14 | 1987-01-14 | Cam barrel of zoom lens barrel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63113109U JPS63113109U (en) | 1988-07-21 |
| JPH0614175Y2 true JPH0614175Y2 (en) | 1994-04-13 |
Family
ID=30784943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987004353U Expired - Lifetime JPH0614175Y2 (en) | 1986-09-30 | 1987-01-14 | Cam barrel of zoom lens barrel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0614175Y2 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5220136B2 (en) * | 1972-11-18 | 1977-06-01 | ||
| JPS5236571Y2 (en) * | 1973-03-23 | 1977-08-20 | ||
| JPS6041533Y2 (en) * | 1980-06-30 | 1985-12-18 | 株式会社リコー | zoom lens barrel |
-
1987
- 1987-01-14 JP JP1987004353U patent/JPH0614175Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63113109U (en) | 1988-07-21 |
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