JPH0614176Y2 - Zoom lens barrel - Google Patents
Zoom lens barrelInfo
- Publication number
- JPH0614176Y2 JPH0614176Y2 JP1987128589U JP12858987U JPH0614176Y2 JP H0614176 Y2 JPH0614176 Y2 JP H0614176Y2 JP 1987128589 U JP1987128589 U JP 1987128589U JP 12858987 U JP12858987 U JP 12858987U JP H0614176 Y2 JPH0614176 Y2 JP H0614176Y2
- 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、上記カム孔に突入させたカムフォロア（ピ
ンの周囲にローラーを設けたもの）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 (having a roller around the pin) projected into the cam hole. It is provided with a movable barrel that is internally mounted and supports a variable-magnification lens and a correction lens, and by rotating the cam barrel, the movable barrel is moved in the optical axis direction for optical variable magnification. It is configured to do.
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.
また、上記したズームレンズ鏡胴はカム筒が周囲に沿っ
て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, the zoom lens barrel described above is formed of a metallic material because it is difficult to perform die-cutting processing using a synthetic resin material or the like because the cam cylinder is an elongated cam hole along the circumference. Therefore, not only the production efficiency is low, but also the cost is high.
そこで、この問題を解決するために、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号及び昭
和６２年実用新案登録願第４３５３号などして既に出願
してある。Therefore, in order to solve this problem, the inventors of the present application have developed a cam cylinder of this kind that can be produced by die cutting, and have applied for a utility model registration application No. 162178 in 1986 and a utility model registration application in 1987. No. 4353 has already been filed.
かかる出願のカム筒は、一端から筒軸方向に切込み形成
した一方側カム孔と、他端から筒軸方向に切込み、上記
一方側カム孔に対して筒周囲位置を換えて形成した他方
側カム孔とを備え、かつ、このカム筒の周囲には一方側
カム孔及び他方側カム孔の両方またはそれらの一方を被
う被板部を設けると共に、この被板部には上記カム孔の
カム面に圧接するカムフォロアと近接するようにしたカ
ム面平行壁を形成し、筒周囲から見ると、カム面とカム
面平行壁とで長孔を形成する構成となっており、また、
カム筒はバヨネット形式で固定枠に取り付けられるよう
になっている。The cam cylinder of this application has one side cam hole formed by cutting from one end in the cylinder axis direction and the other side cam hole formed by cutting from the other end in the cylinder axis direction and changing the cylinder peripheral position with respect to the one side cam hole. And a plate part that covers both or one of the one side cam hole and the other side cam hole is provided around the cam cylinder, and the cam of the cam hole is formed in the plate part. A cam surface parallel wall is formed so as to be close to the cam follower that is in pressure contact with the surface, and when viewed from the cylinder periphery, a long hole is formed by the cam surface and the cam surface parallel wall.
The cam barrel is attached to the fixed frame in a bayonet form.
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ことから、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 a synthetic resin material or the like is used. It is extremely advantageous that it can be formed by die cutting.
「考案が解決しようとする問題点」 上記したような型抜き形成したカム筒を使用したズーム
レンズ鏡胴は組み立ての自動化が可能になればなお効果
的である。"Problems to be solved by the invention" The above-mentioned zoom lens barrel using the die-cut cam barrel is still effective if the assembly can be automated.
しかし、このカム筒を使用したとしても、カム筒を取り
付けた後に、カムフォロアを長孔に差し入れるようにし
て移動筒に固着させなければならず、その作業能率が低
く、また、組み立ての自動化を困難としている。However, even if this cam barrel is used, after mounting the cam barrel, the cam follower must be fixed to the moving barrel by inserting it into the long hole, resulting in low work efficiency and automation of assembly. It's difficult.
「問題点を解決するための手段」 本考案は上記した問題点にかんがみ開発したもので、カ
ム筒のカム面に対接させたカムフォロアを備えた移動枠
がカム筒の回動に連動されて移動し、この移動枠に支持
されたレンズを位置変化させて光学的に変倍する構成の
ズームレンズ鏡胴において、上記カム筒を合成樹脂材で
形成すると共に、このカム筒には、筒状体の端部から筒
軸方向に切込み形成した形状で、切り込み縁壁部をカム
面としたカム孔と、上記カム面にばね勢力で対接させる
上記カムフォロアと当接自在とし、通常時はこのカムフ
ォロアに対し少ない間隔を保つようにしたカム面平行壁
を設けて上記カム孔の周囲に一体形成した被板部と、筒
状体の端部より上記被板部の内面に形成し、上記したカ
ム面とカム面平行壁とで形成される長孔の一端部に連通
させた細形の凹溝とを設け、上記移動枠に予め固着した
カムフォロアを上記凹溝を通して長孔一端部に移行させ
るようにしてカム筒内に移動枠を組み込んだ後、カム筒
のズーミング回動範囲を定めて上記したカムフォロアを
カム面に対接させる構成としたことを特徴とするズーム
レンズ鏡胴を提案する。"Means for solving the problems" The present invention was developed in view of the above problems. A moving frame having a cam follower that is in contact with the cam surface of the cam barrel is interlocked with the rotation of the cam barrel. In a zoom lens barrel configured to move and optically change the magnification of a lens supported by the moving frame, the cam barrel is formed of a synthetic resin material, and the cam barrel has a cylindrical shape. With a shape formed by cutting from the end of the body in the axial direction of the cylinder, the cam hole having the cut edge wall as the cam surface and the cam follower that is brought into contact with the cam surface by the spring force can freely come into contact with each other. The cam wall is formed on the inner surface of the plate portion from the end of the tubular body and the plate portion integrally formed around the cam hole by providing the cam surface parallel wall so as to keep a small distance from the cam follower. Long hole formed by cam surface and cam surface parallel wall After providing a narrow groove communicating with one end of the moving frame, the cam follower fixed in advance to the moving frame is moved to the one end of the long hole through the groove, and after incorporating the moving frame into the cam cylinder, A zoom lens barrel is proposed in which the zoom follower range of the cam barrel is defined and the above-mentioned cam follower is brought into contact with the cam surface.
「作用」 上記した本考案によればカムフォロアを移動枠に予め固
着する。そして、カムフォロアをカム筒の凹溝に合わせ
るようにしてこの移動枠をカム筒に内装する。移動枠に
対してカム筒を僅か回動させると、カムフォロアが長孔
一端部から長孔の他の部分に移るから、この組み込み状
態でカム筒を固定枠に取り付けると共に、ズーミング動
作に必要なカム筒の回動範囲をカムフォロアが長孔一端
部に移らない範囲で定める。[Operation] According to the present invention described above, the cam follower is fixed to the moving frame in advance. Then, the moving frame is installed in the cam barrel so that the cam follower is aligned with the concave groove of the cam barrel. When the cam cylinder is slightly rotated with respect to the moving frame, the cam follower moves from one end of the long hole to the other part of the long hole.In this assembled state, the cam cylinder is attached to the fixed frame and the cam required for zooming operation. The rotation range of the cylinder is determined within the range where the cam follower does not move to the one end of the long hole.
このズームレンズ鏡胴は、カム筒がズーミングによって
回動されているかぎり、カムフォロアが長孔に連通する
凹部に移らない。このことから、移動枠がカム筒より抜
け出して外れることはない。In this zoom lens barrel, the cam follower does not move into the recess communicating with the long hole as long as the cam barrel is rotated by zooming. Therefore, the moving frame does not come out of the cam barrel and come off.
上記のように、移動枠の組み込みが自動化されれば、カ
ム筒の取り付けはバヨネット形式などによって容易であ
るから、ズームレンズ鏡胴の組み立てを自動化すること
ができる。As described above, if the moving frame is automatically incorporated, the cam barrel can be easily attached by the bayonet type, so that the assembling of the zoom lens barrel can be automated.
「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図は同
ズームレンズ鏡胴の分解斜視図である。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。FIG. 1 is a vertical sectional side view of a zoom lens 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 zoom lens barrel. In these figures, 11 is a cylindrical fixed frame that is attached to the camera body or the like, 12 is a moving cylinder that moves on the outer surface of the fixed frame 11, and 13
Is a moving frame that moves within the fixed frame 11, and 14 is a cam barrel that is rotatably provided around the moving barrel 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
にレンズ支持部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、当該レンズ支持部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のストッパー杵１３ｃ、１３ｄが遊挿する。これ
については後述する。A lens support portion 11e is integrally provided in a partition shape at the tip of the fixed frame 11 slightly in the middle, and the lens holder 16 of the fixed lens unit L 1 is screwed to the support portion 11e. The lens supporting portion 11e is provided with an arc-shaped through hole 11f, which has a stopper punch 13c of a moving frame 13 to be described later for determining a 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はピンの周囲にローラーを
有するものであって、これらは移動筒内面に筒軸方向に
長く形成した凸条部１２ｃ、１２ｄに固着してあり、こ
れら凸条部１２ｃ、１２ｄが固定枠１１の案内溝１１
ａ、１１ｂ内を摺動する。また、上記した案内孔１２
ａ、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。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。The cam followers 17a, 17b have rollers around the pins, and these are fixed to the ridges 12c, 12d formed long on the inner surface of the moving cylinder in the cylinder axis direction. These ridges 12c, 12d are Guide groove 11 of fixed frame 11
It slides in a and 11b. In addition, the guide hole 12 described above
Reference numerals a and 12b guide a cam follower of a moving frame 13 described later. Further, a rotating cylinder 19 screwed with a helicoid screw is provided at the tip of the moving cylinder 12, and the lens holder 20 of the moving lens unit L 2 is attached to the rotating cylinder 19.
Is screwed on.
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
て突き出した旋回杵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 determined by a turning punch 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は固定枠１１に設けられた支
持枠に取り付けてあり、合焦用のモータに連動されて回
転駆動する。The focusing pinion 21 is attached to a support frame provided on the fixed frame 11, and is rotationally driven in conjunction with a focusing motor.
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の後端部内
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 notch holes 11c and 11d of the fixed frame 11 so that the inner peripheral surface of the rear end portion of the moving cylinder 12 , And is fixed via a bush by a small screw screwed from 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、各拡径部には光軸方向に設けた凸条部を有す
る円曲面部１３ａ、１３ｂを一体形成し、これら円曲面
部１３ａ、１３ｂの凸条部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。カムフォロア
２６ａ、２６ｂは第２図に示した如く、凸状部面に出没
自在に設けてあるが、常時拡圧スプリング２５ａ、２５
ｂによって突出勢力が与えてある。As can be seen from the perspective view of FIG. 3, the moving frame 13 is a disk-shaped member having circular arc-shaped expanded portions and a central hole formed on the left and right, and each expanded portion is provided in the optical axis direction. Circular curved surface portions 13a and 13b having convex ridge portions are integrally formed, and cam followers 26a and 26b, which are pin-shaped rollers, are provided on the convex ridge portions of the circular curved surface portions 13a and 13b. As shown in FIG. 2, the cam followers 26a and 26b are provided so as to be retractable on the surface of the convex portion.
The protruding force is given by b.
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、円曲面部に設けた凸条
部を移動筒１２内面に光軸方向に沿って形成した凹条溝
１２ｅ、１２ｆに嵌合し、また、カムフォロア２６ａ、
２６ｂを移動筒１２の案内孔１２ａ、１２ｂに遊挿自在
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.
While being loosely inserted into the c and 11d, the ridges provided on the circular curved surface are fitted into the groove ridges 12e and 12f formed on the inner surface of the movable barrel 12 along the optical axis direction, and the cam followers 26a,
26b is freely inserted into the guide holes 12a and 12b of the movable barrel 12 and is brought into contact with the cam surface of the cam barrel 14.
一方、移動枠１３には第３図の斜視図に示したように、
光軸方向に平行に張り出した２本のストッパー杵１３
ｃ、１３ｄが設けてある。これらストッパー杵１３ｃ、
１３ｄ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
囲を定める旋回杵２２の旋回領域に突出し、この旋回杵
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２
７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, as shown in the perspective view of FIG.
Two stopper punches 13 that extend parallel to the optical axis direction
c and 13d are provided. These stopper punches 13c,
13d 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 punch 22 defining the rotation range of the moving lens group L 2, the scope This pivoting punch 22 is given It comes into contact when turning. Further, the lens support frame 2 fixed to the moving frame 13
7 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 to the left in FIGS. 1 and 2, and the movable barrel 12 is moved to the right in FIG. A spring force that constantly pushes in the direction is given.
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１４
ａ、１４ｂが径方向に膨出してカム筒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。他方側カム孔３３、３４
についても同様の被板部１４ｉ、１４ｈが設けてある
が、これは必要に応じて設ける。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 and 32 provided on the front side and the other side cam holes 33 and 34 provided on the rear side. , The substantially triangular plate-like portion 14 that covers the one-sided cam holes 31 and 32
A and 14b are bulged in the radial direction and are 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. Other side cam holes 33, 34
The same plate parts 14i and 14h are also provided for, but these are provided as necessary.
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（第３図）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（第３図）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 FIG. 4, the cam holes 31 and 32 on one side are formed by cutting in the axial direction from the upper and lower portions (FIG. 3) of one end of the cylindrical body. It is composed of a notch hole, and its linear cutting slope sides 31a, 32a form a cam surface, and the other side cam holes 33, 34 are formed by cutting from the left and right portions (FIG. 3) of the other end of the tubular body in the tubular axial direction. The cutout hole is formed, and the curved inclined sides 33a and 34a form the 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、その傾斜部がカム面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。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 its inclined portion has a 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 located at positions where the heads of the cam followers 17a and 17b can come into contact with each other because the diameters of the cam surface parallel walls 14a 1 and 14b 1 are expanded in the cylinder circumferential direction as compared with the cam surfaces 31a and 32a.
なお、カム面平行壁１４ａ1とカムフォロア１７ａとの
間及びカム面平行壁１４ｂ1とカムフォロア１７ｂとの
間には僅かな間隔を設け、通常時にはカムフォロア１７
ａ、１７ｂがこれらカム面平行壁１４ａ1、１４ｂ1に接
触しないようにする。これらカム面平行壁１４ａ1、１
４ｂ1は、移動筒１２が手指などによって引出し力を受
けたときカムフォロア１７ａ、１７ｂを当接させ、移動
筒１２の前方向への引出し移動を阻止する。A slight gap is provided between the cam surface parallel wall 14a 1 and the cam follower 17a and between the cam surface parallel wall 14b 1 and the cam follower 17b.
The a and 17b are prevented from coming into contact with the cam surface parallel walls 14a 1 and 14b 1 . These cam surface parallel walls 14a 1 , 1
4b 1 abuts the cam followers 17a, 17b when the moving barrel 12 receives a pulling force by fingers or the like, and prevents the moving barrel 12 from pulling out in the forward direction.
また、一方側カム孔３１、３２の側方位置に当る被板部
１４ａ、１４ｂ各々の内面には、図示するような凹溝１
４ｊ、１４ｋが筒軸方向に沿って形成してある。凹溝１
４ｊはカム面３１ａとカム面平行壁１４ａ1とによって
形成された長孔に、凹溝１４ｋはカム面３２ａとカム面
平行壁１４ｂ1との間の長孔に各々連通させる。これら
凹溝１４ｊ、１４ｋは移動筒１２を組み込むときにカム
フォロア１７ａ、１７ｂを通すものである。Further, the recessed groove 1 as shown in the drawing is formed on the inner surface of each of the plate portions 14a and 14b that abuts on the side positions of the one side cam holes 31 and 32.
4j and 14k are formed along the cylinder axis direction. Groove 1
4j is a long hole which is formed by the cam surface 31a and cam surface parallel walls 14a 1, grooves 14k causes communicate each with the elongated hole between the parallel walls 14b 1 cam surfaces 32a and the cam surface. These recessed grooves 14j, 14k allow the cam followers 17a, 17b to pass through when the movable barrel 12 is assembled.
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に設け
た支持枠に取り付けてある。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 attached to a support frame provided on the attachment 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のカム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 barrel 14 in the cam axis direction is determined by joining the convex portions 14f and 14g integrally provided on the rear periphery of 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。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.
上記したズームレンズ鏡胴を組み立てるに際しては、移
動筒１２に予めカムフォロア１７ａ、１７ｂを固着する
と共に回動筒１９を螺合させる。次に、移動筒１２をカ
ム筒１４に内装させるが、この場合、第８図及び第９図
に示した如く、カムフォロア１７ａ、１７ｂを凹溝１４
ｊ、１４ｋに合わせるようにして移動筒１２を押し入
れ、カムフォロア１７ａ、１７ｂがカム面に突き当った
ときカム筒１４を回動しておく。When assembling the zoom lens barrel described above, the cam followers 17a and 17b are fixed to the movable barrel 12 in advance and the rotary barrel 19 is screwed. Next, the moving cylinder 12 is placed inside the cam cylinder 14. In this case, as shown in FIGS. 8 and 9, the cam followers 17a and 17b are provided with the concave groove 14
The movable barrel 12 is pushed in so as to be aligned with j and 14k, and the cam barrel 14 is rotated when the cam followers 17a and 17b hit the cam surface.
この回動により、カムフォロア１７ａがガイド孔部βの
領域からズーミングに必要なカム孔領域αに移る。By this rotation, the cam follower 17a moves from the area of the guide hole portion β to the cam hole area α required for zooming.
カムフォロア１７ｂも同様であり、これより、移動筒１
２が抜け止めされる（第１０図参照）。The same applies to the cam follower 17b.
2 is retained (see FIG. 10).
上記のように移動筒１２を組み込んだカム筒１４は固定
枠１１に取り付けるが、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１４ｂ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１
１ｈ、１１ｉに差し入れ、引き続いてこのカム筒１４を
左回動する。The cam cylinder 14 incorporating the moving cylinder 12 as described above is attached to the fixed frame 11. In this case, as shown by the chain double-dashed line in FIG. , The flange portion 14b is located between the stopper protrusion 11j and the locking claw 11m, and the rear end of the cam barrel 14 is fixed to the arc-shaped concave portion 1 of the fixed frame 11.
It is inserted into 1h and 11i, and then the cam barrel 14 is rotated to the left.
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、各々のストッパー凸部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。続いて、移動枠１３とレンズ支持枠１５をコイル
ばね３０を介材させて固定杵１１の後方より内装させ
る。この場合、カムフォロア２６ａ、２６ｂは一端没入
させて他方側カム孔３３、３４の位置で突出させるよう
にし、また、レンズ支持枠１５は移動筒１２の後端部に
ねじ止めする。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. Then, the movable frame 13 and the lens support frame 15 are internally mounted from the rear of the fixed punch 11 with the coil spring 30 interposed therebetween. In this case, the cam followers 26a and 26b are made to be retracted at one end so as to be projected at the positions of the other side cam holes 33 and 34, and the lens support frame 15 is screwed to the rear end portion of the movable barrel 12.
なお、上記したストッパー片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
他に、固定枠１１を固定させるカメラ本体側より弧状凹
形部１１ｈ、１１ｉ内に突出するストッパー部材などに
よって置き換えることができる。The stopper pieces 36a and 36b are fixed to the outer wall surfaces of the arcuate concave portions 11h and 11i with screws, adhesives, or the like, and are fixed inside the arcuate concave portions 11h and 11i from the camera body side to which the fixing frame 11 is fixed. It can be replaced by a stopper member or the like protruding inward.
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。すな
わち、カム筒１４の回動がズーミレングに必要な回動領
域αの範囲に定められる。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. That is, the rotation of the cam barrel 14 is set within the range of the rotation area α required for zooming.
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 spring 30 and move in the optical axis direction as the cam surfaces 33a, 34a of the other side cam holes 33, 34 rotate. It moves to the upper left in FIGS. 1 and 2.
上記の移動過程では、凸条部１２ｃ、１２ｄ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。In the above-mentioned movement process, the ridges 12c and 12d 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.
移動枠１３は、円曲面部１３ａ、１３ｂの凸条部が移動
筒１２の凹条溝１２ｅ、１２ｆに案内され、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１３
ａ、１３ｂが固定枠１１の切欠孔１１ｃ、１１ｄ内を移
動する。In the moving frame 13, the convex strip portions of the circular curved surface portions 13 a and 13 b are guided by the concave strip grooves 12 e and 12 f of the moving barrel 12, and the fixed frame 11
Sliding to the left in the inside without rotating,
a and 13b move in the notch holes 11c and 11d of the fixed frame 11.
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に突き当たりカム筒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、この過負荷を検出もしたスイッチがモ
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 also detects this overload shuts off the power supply to the motor.
第１１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. 11 shows a state in which the wide-angle position is changed to the telephoto position by the above-mentioned zooming. 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。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.
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１９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。On the other hand, the focusing pinion 21 is driven by a motor included in the automatic distance measuring mechanism to rotate the rotating barrel 19 according to the helicoid screw. The turning of the turning barrel 19 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
杵２２がストッパー杵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。Further, when the turning barrel 19 reaches a predetermined turning position, the turning punch 22 strikes either one of the stopper punches 13c and 13d, and the turning of the turning barrel 19 is stopped.
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１１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が共に押し
戻される。カム筒１４が広角位置まで回動されると、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.
11, 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. Both 12 and the moving frame 13 are pushed back. When the cam barrel 14 is rotated to the wide-angle position, the operating state shown in FIGS. 1 and 2 is obtained.
次に、第１２図は本考案の他の応用例を示すズームレン
ズ鏡胴の断面図は、基線Ｐより上側は縦断側面図を、基
端Ｐから下側が横断平面図を示している。Next, FIG. 12 is a cross-sectional view of a zoom lens barrel showing another application example of the present invention, showing a vertical side view above the base line P and a transverse plan view below the base end P.
この応用例はカム筒１４を変形したもので、その他の構
成は第１図及び第２図実施例と同様である。この実施例
のカム筒４０は、筒状体の一端から筒内面に筒軸方向に
切り込み形成し、その切り込み縁壁をカム面４２ａ、４
２ｂ（４２ｂ省略）とした一方側カム溝４１ａ、４１ｂ
（４１ｂ省略）と、筒状体の他端から筒内面に筒軸方向
に切り込み形成し、その切り込み縁壁をカム面４４ａ、
４４ｂとした他方側カム溝４３ａ、４３ｂとを有してい
る。In this application example, the cam cylinder 14 is modified, and other configurations are the same as those in the embodiment of FIGS. 1 and 2. The cam cylinder 40 of this embodiment is formed by cutting from the one end of the cylindrical body in the cylinder inner surface in the cylinder axial direction, and the cut edge walls are formed on the cam surfaces 42a, 4a.
2b (42b omitted) one side cam grooves 41a, 41b
(41b omitted), a cut is formed in the cylinder axial direction from the other end of the cylinder to the cylinder inner surface, and the cut edge wall is formed on the cam surface 44a,
The other side cam grooves 43a and 43b are formed as 44b.
そして、このカム筒４０では第１３図及び第１４図に詳
記した如く、一方側カム溝４１ａ、４１ｂ内にほぼ三角
形状の曲板４５ａ、４５ｂを固着し、この曲板４５ａ、
４５ｂの斜部をカム面平行壁４５ａ1、４５ｂ1として形
成すると共に、この曲板４５ａ、４５ｂの一部とカム溝
の切り込み縁壁の一部とでカムフォロア１７ａ、１７ｂ
を押し入れる凹溝４６ａ、４６ｂを形成している。な
お、これらの図において４７ａ、４７ｂはカム筒４０を
バヨネット構造で取り付けるためのフランジ部である。In this cam barrel 40, as described in detail in FIGS. 13 and 14, curved plates 45a and 45b having substantially triangular shapes are fixed in the cam grooves 41a and 41b on one side, and the curved plates 45a and 45b are fixed.
The inclined portion of 45b is formed as the cam surface parallel walls 45a 1 and 45b 1 , and the cam followers 17a and 17b are formed by a part of the curved plates 45a and 45b and a part of the cut edge wall of the cam groove.
The concave grooves 46a and 46b for pressing in are formed. In these figures, 47a and 47b are flanges for attaching the cam barrel 40 with a bayonet structure.
この応用例によれば、移動筒１２に予めカムフォロア１
７ａ、１７ｂを固着した後、これらカムフォロア１７
ａ、１７ｂを凹溝４６ａ、４６ｂに合わせるようにして
押し入れてからカム筒４０を回動させると、カムフォロ
ア１７ａ、１７ｂが各々のカム面４２ａ、４２ｂに当接
するようになる。したがって、予めカムフォロア１７
ａ、１７ｂを固着した状態で移動筒１２をカム筒４０内
に組み込むことができ、第１図及び第２図実施例と同様
に組み込みの自動化が可能になる。According to this application example, the cam follower 1 is previously attached to the moving barrel 12.
After fixing 7a and 17b, these cam followers 17
When the cam barrel 40 is rotated after pushing in the a and 17b so as to be aligned with the concave grooves 46a and 46b, the cam followers 17a and 17b come into contact with the respective cam surfaces 42a and 42b. Therefore, the cam follower 17 is previously
The movable barrel 12 can be incorporated into the cam barrel 40 in a state in which a and 17b are fixed, and the assembling can be automated as in the embodiment of FIGS. 1 and 2.
以上、本考案に係るズームレンズ鏡胴の実施例について
説明したが、カム筒１４に設けた一方側カム孔３１、３
２と他方側カム孔３３、３４或いは、カム筒４０に設け
た一方側カム溝４１ａ、４１ｂと他方側カム溝４３ａ、
４３ｂの個数などは任意に増減することができ、また、
上記カム孔３１〜３４を橋絡する被板部１４ａ、１４
ｂ、１４ｈ、１４ｉ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、被板部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。Although the embodiments of the zoom lens barrel according to the present invention have been described above, the one side cam holes 31, 3 provided in the cam barrel 14 have been described.
2 and the other side cam holes 33, 34, or the one side cam grooves 41a, 41b and the other side cam groove 43a provided in the cam barrel 40.
The number of 43b and the like can be arbitrarily increased or decreased.
Plated portions 14a, 14 bridging the cam holes 31 to 34
Since b, 14h, 14i and the flange portions 14c, 14d are advantageous in ensuring the circularity of the cam cylinder 14, the plate portions are continuously formed and provided around the entire cylinder. Good.
特に、カム筒１４、４０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、合成樹脂材などの材料を使用したローコ
ストの組み込み易いカム筒となる。In particular, the cam cylinders 14 and 40 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、本考案のズームレンズ鏡胴は、直線的に移動する
光学系と、非直線的に移動する光学系とを変位するカム
筒に適するから、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 zoom lens barrel of the present invention is suitable for a cam barrel that displaces a linearly moving optical system and a non-linearly moving optical system, so that the master lens and the focusing lens are fixed, A zoom lens barrel that has been widely known from the past and has a configuration in which a variable power lens and a correction lens are moved between these lenses can be easily implemented.
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 zoom lens barrel for a small-sized 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、本考案に係るズームレンズ鏡胴は、カム
フォロアを予め移動枠に固着した状態でこの移動枠をカ
ム筒内に組み込むことができ、カムフォロア及び移動枠
の組込みが簡単となり、その結果、ズームレンズ鏡胴の
組み立てを自動化する上に極めて有利となる。[Advantage of Invention] As described above, in the zoom lens barrel according to the present invention, the moving frame can be incorporated in the cam barrel in a state where the cam follower is fixed to the moving frame in advance, and the cam follower and the moving frame can be easily assembled. As a result, it is extremely advantageous for automating the assembly of the zoom lens barrel.
また、カム筒に設けたカム孔、長孔及び凹溝などがカム
筒の型抜き加工によって形成されるので、カム筒の生産
が難しく高価なものとなることがなく実用的となる。Further, since the cam hole, the long hole, the concave groove and the like provided in the cam barrel are formed by the die cutting process of the cam barrel, the production of the cam barrel is difficult and not expensive, and it is practical.
したがって、本考案はズームレンズ鏡胴の多くの各部品
を型抜き形成することができるようになるから、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。Therefore, according to the present invention, many parts of the zoom lens barrel can be formed by die-cutting, which makes it 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胴の横断平
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図はカム筒の正面図、第９図及び第１０図はカ
ムフォロア部分を示す部分図で、第９図はカムフォロア
がカム筒の凹溝を通ってガイド孔部に位置している状態
を、第１０図はカムフォロアがカム筒のカム孔に位置し
ている状態を各々示す断面図、第１１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１２図は他の応用例を示すズームレンズ
鏡胴の断面図、第１３図は第１２図応用例に備えたカム
筒の正面図、第１４図は第１３図上のＢ−Ｂ線断面図で
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 １４ｊ、１４ｋ……凹溝 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 ４０……カム筒The drawings show 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. 1 is a reduced sectional view taken along the line AA in FIG. 1, FIG. 8 is a front view of the cam barrel, FIGS. 9 and 10 are partial views showing the cam follower portion, and FIG. 9 is a concave groove of the cam barrel in the cam follower. 10 is a sectional view showing a state in which the cam follower is positioned in the cam hole of the cam barrel, and FIG. 11 is a state in which the cam follower is moved from the wide-angle position to the telephoto position. FIG. 12 is a vertical sectional side view of the zoom lens barrel, FIG. 12 is a cross-sectional view of the zoom lens barrel showing another application example, FIG. 13 is a front view of a cam barrel provided in FIG. 12 application example, and FIG. The drawing is a sectional view taken along line BB in FIG. 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 14j, 14k ... Recessed grooves 17a, 17b ... Cam followers 26a, 26b ... Cam followers 31 , 32 ...... One side cam hole 33, 34 ...... Other side cam hole 40 ...... Cam tube
───────────────────────────────────────────────────── フロントページの続き (72)考案者 武田 滋 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 酒井 宣宙 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 (56)参考文献 実開 昭58−141206（ＪＰ，Ｕ) 実開 昭61−34116（ＪＰ，Ｕ) 実開 昭52−124737（ＪＰ，Ｕ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shigeru Takeda Shigeru Okada 2800 Nagachi, Okaya City Nagano Prefecture Kyocera Stock Association President Nookaya Plant (72) Nobuhiro Sakai 2800, Okaya City Nagano Prefecture Kyocera Stock Association President Nookaya In the factory (56) References Open 58-141206 (JP, U) Open 61-34116 (JP, U) Open 52-124737 (JP, U)
Claims (1)
を備えた移動枠がカム筒の回動に連動されて移動し、こ
の移動枠に支持されたレンズを位置変化させて光学的に
変倍する構成のズームレンズ鏡胴において、上記カム筒
を合成樹脂材で形成すると共に、このカム筒には、筒状
体の端部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カム孔と、上記カム面にばね
勢力で対接させる上記カムフォロアと当接自在とし、通
常時はこのカムフォロアに対し少ない間隔を保つように
したカム面平行壁を設けて上記カム孔の周囲に一体形成
した被板部と、筒状体の端部より上記被板部の内面に形
成し、上記したカム面とカム面平行壁とで形成される長
孔の一端部に連通させた細形の凹溝とを設け、上記移動
枠に予め固着したカムフォロアを上記凹溝を通して長孔
一端部に移行させるようにしてカム筒内に移動枠を組み
込んだ後、カム筒のズーミング回動範囲を定めて上記し
たカムフォロアをカム面に対接させる構成としたことを
特徴とするズームレンズ鏡胴。1. A moving frame provided with a cam follower that is in contact with the cam surface of a cam barrel moves in conjunction with the rotation of the cam barrel, and the lens supported by this moving frame is changed in position optically. In a zoom lens barrel having a variable power structure, the cam barrel is formed of a synthetic resin material, and the cam barrel has a shape formed by cutting from the end of the tubular body in the axial direction of the barrel. The cam hole that has a cam surface and the cam follower that is brought into contact with the cam surface by a spring force can freely come into contact with each other, and a cam surface parallel wall that keeps a small gap with respect to the cam follower is normally provided. The plate part integrally formed around the hole and the end of the cylindrical body are formed on the inner surface of the plate part, and communicate with one end of the long hole formed by the cam surface and the cam surface parallel wall. It has a thin groove and it is fixed in advance to the moving frame. After the moving frame was installed in the cam barrel so as to move the mufollower to the one end of the elongated hole through the concave groove, the zooming rotation range of the cam barrel was set and the cam follower was brought into contact with the cam surface. This is a zoom lens barrel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987128589U JPH0614176Y2 (en) | 1987-08-26 | 1987-08-26 | Zoom lens barrel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987128589U JPH0614176Y2 (en) | 1987-08-26 | 1987-08-26 | Zoom lens barrel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6434607U JPS6434607U (en) | 1989-03-02 |
| JPH0614176Y2 true JPH0614176Y2 (en) | 1994-04-13 |
Family
ID=31382071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987128589U Expired - Lifetime JPH0614176Y2 (en) | 1987-08-26 | 1987-08-26 | Zoom lens barrel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0614176Y2 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5634881Y2 (en) * | 1976-03-18 | 1981-08-17 | ||
| JPS58141206U (en) * | 1982-03-19 | 1983-09-22 | 株式会社日立製作所 | zoom lens barrel |
| JPS6041533U (en) * | 1983-08-31 | 1985-03-23 | 日産自動車株式会社 | Internal combustion engine misfire detection device |
| JPS6134116U (en) * | 1984-07-31 | 1986-03-01 | 株式会社リコー | cam for zoom lens |
-
1987
- 1987-08-26 JP JP1987128589U patent/JPH0614176Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6434607U (en) | 1989-03-02 |
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