JPS5842005A - Zoom lens barrel - Google Patents
Zoom lens barrelInfo
- Publication number
- JPS5842005A JPS5842005A JP13982381A JP13982381A JPS5842005A JP S5842005 A JPS5842005 A JP S5842005A JP 13982381 A JP13982381 A JP 13982381A JP 13982381 A JP13982381 A JP 13982381A JP S5842005 A JPS5842005 A JP S5842005A
- Authority
- JP
- Japan
- Prior art keywords
- cam
- cam groove
- groove
- cylinder
- lens barrel
- 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.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 claims abstract description 14
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 7
- 239000000057 synthetic resin Substances 0.000 claims abstract description 7
- 239000007769 metal material Substances 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000000465 moulding Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lens Barrels (AREA)
- Transmission Devices (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は、ズームレンズ−胴におけるカム筒に形成し
たカム溝及び該カム溝に保合するカムピンの改良に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in a cam groove formed in a cam barrel of a zoom lens barrel and a cam pin fitted in the cam groove.
この種の従来構造の一例を第１図乃至！３図について簡
単に説明する。An example of this type of conventional structure is shown in Figure 1. Figure 3 will be briefly explained.
第１図において、１はカム筒で、カム筒１に所望のカム
１１２．２’を形成する。３はカム筒１を回動自在に嵌
合した固定胴、４．４′は固定胴３内で例えば直線カム
溝３ａに案内されて光軸Ｏ−０′方向に移動自在に支持
されるレンズ保持枠で、レンズ保持枠４．４′の外周面
に円筒形状のカムピン５．５′を設け、カムピン５．５
′はカム溝２．２′に係合している。In FIG. 1, 1 is a cam cylinder, and a desired cam 112.2' is formed on the cam cylinder 1. 3 is a fixed barrel into which the cam cylinder 1 is rotatably fitted, and 4.4' is a lens supported within the fixed barrel 3 so as to be movable in the direction of the optical axis O-0' by being guided by, for example, a linear cam groove 3a. In the holding frame, a cylindrical cam pin 5.5' is provided on the outer peripheral surface of the lens holding frame 4.4'.
' is engaged with the cam groove 2.2'.
したがって、ズーム環６を回動させると該ズーム環６に
連結されたカム筒１は光軸０−０′の周りに回動し、カ
ム筒１のカム＃１１２．２’に沿いカムピン５．５′が
摺動するため、レンズ保持枠４．４′が光軸Ｏ−０′方
向に移動しズーミングが行われる。Therefore, when the zoom ring 6 is rotated, the cam barrel 1 connected to the zoom ring 6 rotates around the optical axis 0-0', and the cam pin 5. 5' slides, the lens holding frame 4.4' moves in the direction of the optical axis O-0' and zooming is performed.
このように従来構造のズームレンズ鏡胴におけるカム筒
１のカム溝２．２′は、光軸Ｏ−０′を回動中心とする
レンズ保持枠４．４′に設けたカムピン５．５′が係合
するようになっているから、第２図、第３図に示すとお
り、カム溝２．２′の溝巾の中心は全ての位置で常に光
軸０−０’に向いているように形成しなければならない
。In this way, the cam groove 2.2' of the cam barrel 1 in the zoom lens barrel of the conventional structure is connected to the cam pin 5.5' provided in the lens holding frame 4.4' with the optical axis O-0' as the center of rotation. As shown in Figures 2 and 3, the center of the groove width of the cam groove 2.2' always faces the optical axis 0-0' at all positions. must be formed.
そこで、従来構造のアルミニウムなどの金属材料のカム
溝の場合は、カム溝の内外径寸法精度及びカム溝寸法精
度を出すために、ブランク取り、熱処理、内径切削、カ
ム溝荒仕上げ、カム溝仕上加工、カム溝パリ取９、ホー
ニング、アルマイト加工、外径仕上けなどという多工程
を必要とし、生産コストが高くなる欠点があった。Therefore, in the case of conventional cam grooves made of metal materials such as aluminum, blanking, heat treatment, inner diameter cutting, cam groove rough finishing, and cam groove finishing are required to achieve the dimensional accuracy of the inner and outer diameters of the cam grooves and the dimensional accuracy of the cam grooves. It requires multiple steps such as machining, cam groove deburring9, honing, alumite processing, and outer diameter finishing, which has the disadvantage of increasing production costs.
更に、このような欠点を避ける丸めに、実開昭５３−１
３３６３８号公報に示すように、薄板のしぼり成形によ
りカム溝を形成した力太筒も公知であるが、この場合、
レンズ重量がかなりムくなると、強度及びカム溝の寸法
精度、円筒度、内外径寸法精度などで性能上安定した精
度の高いカム筒を作ることはできない
又、実開昭５３−１５２６２９号公報に示すように合成
樹脂によシ成蓋した有底のカム溝を有するカム溝も公知
であるが、有底のカム溝をカム筒内径側から成形しよう
とすると、金型は割数にする必要がありカム溝の寸法精
度に限度があった。Furthermore, in order to avoid such drawbacks, Utility Model Application No. 53-1
As shown in Japanese Patent No. 33638, a thick cylinder in which a cam groove is formed by squeezing a thin plate is also known, but in this case,
If the lens weight becomes considerably heavy, it is not possible to make a highly accurate cam cylinder with stable performance in terms of strength, dimensional accuracy of the cam groove, cylindricity, and dimensional accuracy of the inner and outer diameters. As shown in the figure, cam grooves with bottomed cam grooves covered with synthetic resin are also known, but if a bottomed cam groove is to be molded from the inner diameter side of the cam cylinder, the mold needs to be divided into parts. There was a limit to the dimensional accuracy of the cam groove.
この発明は、上記した従来構造及び公知技術のもつ欠点
を解消しようとするもので、その目的とするところは、
カム溝を形成したカム溝と該カム溝に係合するカムビン
を設けたレンズ保持枠とを有し、カム筒の回動によシレ
ンズ保持枠を光軸方向に移動させるズームレンズ鏡胴に
おいて、前記カム溝の溝巾の中心を常に光軸を含む所定
平面に直交するような向きに形成し、前記カムピンの前
記カム溝保合部分を球状に形成したことを特徴とするズ
ームレンズ鏡胴を提供することＫある。又、合成樹脂に
より成截したカム筒を有する前記ズームレンズ鏡胴、更
に、カム溝をプレス加工によシ形成したカム筒を有する
前記ズームレンズ鏡胴をそれぞれ提供することにある。This invention attempts to eliminate the drawbacks of the conventional structure and known technology described above, and its purpose is to:
A zoom lens barrel having a cam groove in which a cam groove is formed and a lens holding frame provided with a cam bin that engages with the cam groove, and in which the lens holding frame is moved in the optical axis direction by rotation of the cam barrel, A zoom lens barrel characterized in that the center of the groove width of the cam groove is always oriented perpendicular to a predetermined plane containing the optical axis, and the cam groove retaining portion of the cam pin is formed in a spherical shape. I have a lot to offer. Another object of the present invention is to provide the zoom lens barrel having a cam barrel made of synthetic resin, and the zoom lens barrel having a cam barrel having a cam groove formed by press working.
以下、この発明の一実施例を第４図乃至第７図について
説明する。An embodiment of the present invention will be described below with reference to FIGS. 4 to 7.
なお、第４図は全体の部分を省略し要部のみを示した断
面図であり、同図に示されない部分は第１図に示された
部分と同様である
第４図乃至第６図において、カム筒１に形成したカム溝
２の溝巾の中心を、常に一平面例えば光軸０−０′を含
む所定平面即ち第５図々示の水平面ｘ−ｘ’に直交する
ような向きに形成する。In addition, FIG. 4 is a cross-sectional view showing only the main parts with the whole part omitted, and the parts not shown in the same figure are the same as the parts shown in FIG. 1. , the center of the groove width of the cam groove 2 formed in the cam cylinder 1 is always oriented perpendicularly to one plane, for example, a predetermined plane including the optical axis 0-0', that is, the horizontal plane x-x' shown in FIG. Form.
又、カム溝２に係合するカムピン５のカム溝保合部分を
球状に形成する。Further, the cam groove retaining portion of the cam pin 5 that engages with the cam groove 2 is formed into a spherical shape.
これを第８図によシ詳しく説明するとカム鍔２の両側壁
２−１１．２−２の中心線ｔが水平面Ｘ−Ｘと直角にな
るよう形成する、
このことがＡ％Ｂ、Ｃを含めて、カム＃ＩＩ２の全長に
わたって成り立つようにカム溝を形成する。To explain this in detail with reference to FIG. 8, the center line t of both side walls 2-11, 2-2 of the cam flange 2 is formed to be perpendicular to the horizontal plane X-X. A cam groove is formed so as to extend over the entire length of cam #II2.
この様に、カム溝２の溝巾の中心が常に光軸０−０′を
通る水平ｄ［１ｘ−ｘ’４ｃ直交するような向きに形成
されている結果、カム筒５の外径側より金型をスライド
構成することによりカム溝２を構成でき、合成樹脂の成
型加工によるカム筒を製作できる・
又、金属材料のカム溝の場合呟、カム筒５の外径側より
プレス加工でカム溝を形成することができる。In this way, the center of the groove width of the cam groove 2 is always perpendicular to the horizontal d[1x-x'4c passing through the optical axis 0-0', and as a result, The cam groove 2 can be formed by sliding the mold, and the cam cylinder can be manufactured by molding synthetic resin.Also, in the case of a cam groove made of metal material, the cam can be formed by press working from the outer diameter side of the cam cylinder 5. Grooves can be formed.
−そして、カムピン５０力ム溝保合部分を球状に形成し
ているから、従来構造のように、カム溝の溝巾の中心が
全ての位置で常に光軸０−０′に向いているように形成
されていなくても、球状のカム婢保合部分はカム溝に容
易、に係合追従してカム溝内を摺動できる〇
更に又、第７図に示すように、円弧状の薄板１１１にカ
ム溝２をプレス加工により形成し、該薄板１ａを軸方向
開口を有するカム溝に固定する３ともできる。-The cam pin 50 force groove retaining portion is formed into a spherical shape, so that the center of the cam groove width always faces the optical axis 0-0' at all positions, unlike the conventional structure. The spherical cam volume retaining portion can easily engage and follow the cam groove and slide within the cam groove even if it is not formed in the shape of a circular arc thin plate as shown in Figure 7. It is also possible to form a cam groove 2 in 111 by press working, and fix the thin plate 1a to the cam groove having an axial opening.
この発明は１、前記Ｌ７た構成により次の効果を有する
・
（１） 合成樹脂材料のカム溝の場合、金属材料のカム
溝に比較して工程も一縮でき、大巾にコストダウンでき
る。This invention has the following effects due to the above-mentioned L7 configuration. (1) In the case of a cam groove made of a synthetic resin material, the process can be shortened in comparison to a cam groove made of a metal material, and the cost can be significantly reduced.
（２） 金属材料のカム筒の場合、カム溝をプレス加
工できるので従来技術におけるＮＣ機又はカム溝専用機
などによる工数の多いカム溝加工工程を短輸でき、コス
トダウンできる０（３） 円弧状の薄板にカム溝をプ
レス加工により形成し、該薄板を軸方向開口を有するカ
ム筒に固定し、ズームレンズ間で交換可能とする場合は
、共通化となりコストダウンに多大の効果がある。(2) In the case of cam cylinders made of metal materials, the cam grooves can be press-processed, so the cam groove machining process, which requires a lot of man-hours using conventional technology such as an NC machine or a special machine for cam grooves, can be shortened and costs can be reduced by 0 (3) yen. If a cam groove is formed in an arc-shaped thin plate by press working, and the thin plate is fixed to a cam cylinder having an axial opening, so that it can be exchanged between zoom lenses, it becomes common and has a great effect on cost reduction.
（４） 合成樹脂材料のカム筒の場合、又は円弧状の
薄板にカム溝をプレス加工により形成し該薄１ｆｋＬを
軸方向開口を有するカム筒に固定した場合、軽瀘化に寄
与できる。(4) In the case of a cam cylinder made of synthetic resin material, or in the case where a cam groove is formed in an arcuate thin plate by press working and the thin 1fkL is fixed to a cam cylinder having an axial opening, it can contribute to light filtering.
（５） カム筒の外径側から金型又はプレス加工によ
りカム溝を形成できるので、製作が容易で高い寸法桔度
のカム筒を得ることができる０（６） カム溝の溝巾
の中心が光軸に向いていないカム溝においても、カムピ
ンの球状カム壽係会部分は摺動可能であるＯ(5) Since the cam groove can be formed from the outer diameter side of the cam cylinder by molding or press working, it is easy to manufacture and a cam cylinder with high dimensions can be obtained.0 (6) Center of the groove width of the cam groove Even in the cam groove where the cam pin is not facing the optical axis, the spherical cam head portion of the cam pin can slide.
第１図は従来のズームレンズ鏡胴の−ＰＩ Ｆ） ＩＩ
Ｉ断面図中、カム機構部分を示す説明図、第２図はＩＪ
Ｉ図に示すカム筒の斜視図、第３図は第１図に示すカム
筒、カムピン、固定胴などの説明概念図、第４図はこの
発明のズームレンズ鏡胴の一実施的の要部の与を示す縦
断面図、第５図は第４図に示すカム筒の斜視図、第６図
は８８４図に示すカム−筒、カムピン、固定胴などの断
面を示す説明概念図、＠７図はこの発明のズームレンズ
鏡胴の一実施例に使用される円弧状薄板の斜視図、第８
図はこの発明のカム溝の形状を示す拡大説明図である■Figure 1 shows the -PIF) II of a conventional zoom lens barrel.
In the I cross-sectional view, an explanatory diagram showing the cam mechanism part, Figure 2 is IJ
Figure I is a perspective view of the cam barrel shown in Figure I, Figure 3 is an explanatory conceptual diagram of the cam barrel, cam pin, fixed barrel, etc. shown in Figure 1, and Figure 4 is an exemplary main part of the zoom lens barrel of the present invention. FIG. 5 is a perspective view of the cam cylinder shown in FIG. 4, and FIG. 6 is an explanatory conceptual diagram showing a cross section of the cam cylinder, cam pin, fixed cylinder, etc. shown in FIG. The figure is a perspective view of an arcuate thin plate used in an embodiment of the zoom lens barrel of the present invention.
The figure is an enlarged explanatory view showing the shape of the cam groove of this invention.■
Claims (1)
ピンを設けたレンズ保持枠とを有し、カム筒の回動によ
りレンズ保持枠を光軸方向に移動させるズームレンイ鏡
胴において、前記カム溝の溝巾の中心線を常に所定の一
平面に直交するような向きに形成し、前記カムピンの前
記カム溝保合部分を球状に形成したことを特徴とするズ
ームレンズ鏡胴。 ２ 合成樹脂により成型したカム筒を有することを特徴
とする特許請求の範囲第１項ｇＱ載のズームレンズ鏡胴
。 ３ カム溝をプレス加工により、形成したカム筒を有す
ることを特徴とする特許請求の範囲第１項記献のズーム
レンズ鏡胴。[Scope of Claims] 1. A lens holding frame having a cam cylinder formed with a cam groove and a cam pin that engages with the cam groove, and moving the lens holding frame in the optical axis direction by rotation of the cam cylinder. A zoom lens barrel, characterized in that the center line of the groove width of the cam groove is always orthogonal to a predetermined plane, and the cam groove retaining portion of the cam pin is formed in a spherical shape. lens barrel. 2. A zoom lens barrel according to claim 1, gQ, characterized in that it has a cam barrel molded from synthetic resin. 3. The zoom lens barrel according to claim 1, characterized in that it has a cam tube in which a cam groove is formed by press working.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13982381A JPS5842005A (en) | 1981-09-07 | 1981-09-07 | Zoom lens barrel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13982381A JPS5842005A (en) | 1981-09-07 | 1981-09-07 | Zoom lens barrel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5842005A true JPS5842005A (en) | 1983-03-11 |
| JPS6216409B2 JPS6216409B2 (en) | 1987-04-13 |
Family
ID=15254297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13982381A Granted JPS5842005A (en) | 1981-09-07 | 1981-09-07 | Zoom lens barrel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5842005A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6166252U (en) * | 1984-10-05 | 1986-05-07 | ||
| JPS6250107A (en) * | 1985-06-21 | 1987-03-04 | Toyo Seikan Kaisha Ltd | Apparatus for supplying resin |
| US5245476A (en) * | 1989-03-14 | 1993-09-14 | Asahi Kogaku Kogyo Kabushiki Kaisha | Zoom lens barrel |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB961483A (en) * | 1961-08-04 | 1964-06-24 | Angenieux Pierre | Improvements in or relating to guide means permitting the longitudinal displacement of a barrel carrying lens |
-
1981
- 1981-09-07 JP JP13982381A patent/JPS5842005A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB961483A (en) * | 1961-08-04 | 1964-06-24 | Angenieux Pierre | Improvements in or relating to guide means permitting the longitudinal displacement of a barrel carrying lens |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6166252U (en) * | 1984-10-05 | 1986-05-07 | ||
| JPS6250107A (en) * | 1985-06-21 | 1987-03-04 | Toyo Seikan Kaisha Ltd | Apparatus for supplying resin |
| US5245476A (en) * | 1989-03-14 | 1993-09-14 | Asahi Kogaku Kogyo Kabushiki Kaisha | Zoom lens barrel |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6216409B2 (en) | 1987-04-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS5842005A (en) | Zoom lens barrel | |
| US5221993A (en) | Annular optical member | |
| JPS5921362Y2 (en) | zoom lens barrel | |
| US5191482A (en) | Lens driving apparatus | |
| JP2643284B2 (en) | Cam device for lens movement | |
| US6594088B2 (en) | Method for molding cam ring with convex cams, molding die assembly, and molded cam ring | |
| JPS5810707A (en) | Lens barrel having moving mechanism for lens group | |
| JPH03129912U (en) | ||
| JPH0529013U (en) | Lens barrel | |
| JP4104906B2 (en) | Guide tube, lens barrel and projector | |
| US6714359B2 (en) | Lens barrel and cam ring | |
| JPH0417923Y2 (en) | ||
| JPS6241289Y2 (en) | ||
| JPS62112109A (en) | Device for energizing cam pin of zoom lens | |
| JPS639201B2 (en) | ||
| JPH026915A (en) | Lens barrel | |
| JPS6120842B2 (en) | ||
| JPH0231363B2 (en) | RENZUKYOTONOIDOKIKO | |
| JPS6234112A (en) | Lens barrel with cam mechanism | |
| JPS62156607A (en) | lens barrel | |
| JPH071609Y2 (en) | Cam barrel of zoom lens barrel | |
| JPS61190515U (en) | ||
| JPH03145611A (en) | Zoom lens | |
| JPH04125605A (en) | lens moving device | |
| US4676600A (en) | Sound preventing means in sliding lens barrel and method of manufacture thereof |