JPS615218A - Zoom lens barrel - Google Patents
Zoom lens barrelInfo
- Publication number
- JPS615218A JPS615218A JP12514584A JP12514584A JPS615218A JP S615218 A JPS615218 A JP S615218A JP 12514584 A JP12514584 A JP 12514584A JP 12514584 A JP12514584 A JP 12514584A JP S615218 A JPS615218 A JP S615218A
- Authority
- JP
- Japan
- Prior art keywords
- cam ring
- zoom lens
- correction system
- optical axis
- axis direction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
- G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lens Barrels (AREA)
Abstract
Description
【発明の詳細な説明】 〔発明の利用分野〕 不発明は、ズームレンズ鏡筒に関するもので。[Detailed description of the invention] [Field of application of the invention] The non-invention relates to zoom lens barrels.
特に、固定筒にグラスチック材を使用した場合のズーム
部の光軸方向のガタによる焦点面の位置ズレを防止する
ものである。In particular, this is intended to prevent displacement of the focal plane due to backlash in the optical axis direction of the zoom section when a plastic material is used for the fixed barrel.
従来のズームレンズ鏡筒は、 実開ｍ ５ｓ−１５０８
２４号公報に示されるよう［固定筒とカム環との光軸方
向の長さの差によるガタ蓋を坑合也立により管理してい
たので、このガタ蓋は約１０〜３０μｍしか許容されて
いない。そのため、固定筒にプラスチック材、カム環に
アルミ材を通用した場合、ズームレンズの使用温度範囲
一１０℃〜５０℃に対するプラスチック材とアルは材と
の膨張係数の差から生ずる固定筒とカム環との光軸方向
の長さの変化の差約４０μｍにより、固定筒とカム環と
のガタ蓋がある使用温度において０μｍとなってしまう
。その結果、カム環の回動か不可能となることから、ｔ
ｉ！ｉ１足前とカム環とに膨張係数の異なる材質が適用
できず、固定筒にグラスチック材を適用してコストダウ
ンを計ることができｒｘかつ良。The conventional zoom lens barrel is actual open m5s-1508.
As shown in Publication No. 24, the backlash due to the difference in length in the optical axis direction between the fixed tube and the cam ring was controlled by a shaft, so this backlash was only allowed to be about 10 to 30 μm. do not have. Therefore, when plastic material is used for the fixed barrel and aluminum material is used for the cam ring, the difference in expansion coefficient between the plastic material and the aluminum material in the operating temperature range of the zoom lens - 10°C to 50°C will cause the difference between the fixed barrel and the cam ring. Due to the difference in length in the optical axis direction of about 40 μm, the difference becomes 0 μm at the operating temperature where there is play between the fixed cylinder and the cam ring. As a result, the cam ring cannot be rotated, so t
i! Since it is not possible to use materials with different expansion coefficients for the i1 front leg and the cam ring, it is possible to reduce costs by using a plastic material for the fixed cylinder, which is both rx and good.
筐だ、両者をプラスチック材と丁れば膨張係数の差を問
題とすることはな＾が、カム環においてカム溝を楕度良
ぐ切削することがグラスチック材では不可能であるため
、固定筒、カム環共にプラスチック材を適用することは
できない。Regarding the housing, if both are made of plastic material, the difference in expansion coefficients will not be a problem, but since it is impossible to cut the cam groove with a good oval in the cam ring with plastic material, it is not possible to fix the cam ring. Plastic materials cannot be used for both the cylinder and the cam ring.
本発明の目的は、固定筒にグラスチック材を適用しＬは
コスト、軽重のズームレンズヲ提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a zoom lens that uses a glass material for a fixed barrel and is low in cost and light in weight.
固定筒にプラスチック材を適用した場合、アルミ材のカ
ム環との光軸方向の貴さの差は、使用温度−１０℃〜５
０℃の範囲内でカム域を回動させるために、固定筒とカ
ム環との熱膨張係数の違いによる。長さの変化の屋約４
０μｍ以上であることが必要で１部品精度も考嵐すると
約５０〜７０μｍとなる。すると、固定筒とカム環との
光軸方向のガタ量も５０〜７０μｍとなり、ズームレン
ズの焦点位置ズレが増大する。本発明は、この点を解消
するため、コイルはね等により、ズームレンズの補正系
を常に一方向に押し西てて。When a plastic material is used for the fixed tube, the difference in stiffness in the optical axis direction from the aluminum cam ring is between -10°C and 5°C at the operating temperature.
In order to rotate the cam area within a range of 0°C, the difference in thermal expansion coefficients between the fixed cylinder and the cam ring is used. Change in length about 4
It needs to be 0 μm or more, and when considering the accuracy of one part, it is about 50 to 70 μm. Then, the amount of backlash between the fixed barrel and the cam ring in the optical axis direction also becomes 50 to 70 μm, increasing the focal position shift of the zoom lens. In order to solve this problem, the present invention constantly pushes the correction system of the zoom lens in one direction using a coil spring or the like.
前記固定筒とカム環とのガタによる補正系のガタつきを
低減して、焦点位置すれの間瓶を解消するものである。This is intended to reduce the wobbling of the correction system due to the wobbling between the fixed barrel and the cam ring, and eliminate the bottleneck caused by the focus position.
０発例の実施例〕 以下１本発明の一失施例を図に訳り説明する。Example of 0 cases] Hereinafter, one embodiment of the present invention will be explained with reference to the drawings.
図において、１は固定筒、２（エカム堀、３はコンペン
セーター（補正系）、４はロッド、５をエコイルはね、
６ｔ１押さえ似％ ７＆ｓ力ムンオロワー、８ｔエカム
酵である。In the figure, 1 is a fixed cylinder, 2 (ecam moat), 3 is a compensator (correction system), 4 is a rod, 5 is an echo coil,
It is 6t1 press similar%, 7&s force moon lower, 8t ekam yeast.
カム環２をアルミ材で２０℃での長さ３６．０００〜５
６０１５勲り、固定筒１をｐ Ｃ’ Ｇ （３０％）
で、２０℃でのカム堀入り部の長さ３ａ０４５〜５６．
０６０ｙｎｍと丁レバ、常温２０℃でのカム環２と固定
筒１とのガタ蓋は［Ｊ、０３〜０．０６ｍｍとなる。低
′＠時−１０℃では。Cam ring 2 is made of aluminum and has a length of 36,000 to 5 at 20℃.
6015, fixed cylinder 1 p C' G (30%)
So, the length of the cam drilling part at 20°C is 3a045~56.
The backlash between the cam ring 2 and the fixed cylinder 1 at room temperature of 20° C. is [J, 03 to 0.06 mm. At low temperature -10℃.
ｐＣ−Ｇ（３０チ）の固定筒１の収紬菫かアルミ材のカ
ム域２よりも０．０２ｚｘ大きいので、カム環２と固定
１１とのガタ量は０．０１〜０．０４ｍηＬとなる。Since it is 0.02zx larger than the cam area 2 of the fixed tube 1 of pC-G (30 inches) made of violet or aluminum material, the amount of play between the cam ring 2 and the fixed tube 11 is 0.01 to 0.04 mηL. .
高温時５０℃では、同僚にして前記ガタｆは０．０５〜
０．０８Ｂとなる。通常このガタ蓋は０．０１〜０．０
４ｍｍであり、この範囲Ｐ３ならば焦点位置ずれも許容
範囲内である。よって本発明におい′Ｃは、常温〜高温
の直置範囲に′Ｍいて、８１Ｊ記カタ虚が許容レベルを
超えるため、ロッド４のまわりに。At a high temperature of 50℃, the play f is 0.05~
It becomes 0.08B. Usually this rattling lid is 0.01 to 0.0
4 mm, and within this range P3, the focal position shift is also within the allowable range. Therefore, in the present invention, C is placed around the rod 4 in the direct position range of room temperature to high temperature, and the katakaku described in 81J exceeds the permissible level.
押すえ板６とコンペンセーター３この間ニ、コイルはね
５を介在させ、カムフォロワー７が。A cam follower 7 is placed between the pressing plate 6 and the compensator 3, with a coil spring 5 interposed between them.
カム溝８の図における右ＨＶＣ押しつけられるよ５１Ｃ
ｆることで、コンペンセーター３ガタつきを防止した。The right HVC in the diagram of cam groove 8 is pressed 51C
This prevents the compensator 3 from rattling.
なお、附言すれば１本発明にｇいては、変倍系のガタつ
きについては河木されておらず、常温、高温において、
従来より％ガタは大となるが、ズーミングの広角近傍で
は変倍系のガタによる焦点位置ずれは、補正系のガタつ
きＫＪ、’る焦点位置ずれの約１ＡＤ 程度であり１間
過７．Ｃい。It should be noted that in the present invention, the rattling of the variable power system has not been addressed, and at room temperature and high temperature,
Although the % wobble is larger than before, near the wide angle of zooming, the focus position shift due to the play in the variable magnification system is about 1 AD of the focus position shift caused by the play in the correction system, which is about 1 AD. C.
また、ズーミングの望遠近傍においては、に倍系のガタ
つきによる焦点位置ずれは、補正系のガタつきによるも
のとほぼ同等となるが、望遠近傍においては被写界深度
が洩くなることから距離環を回すことにより使用者が容
易にビ／トを合わせられるので問題ない。In addition, when zooming near telephoto, the focal position shift due to rattling in the magnification system is almost the same as that due to rattling in the correction system, but near telephoto, the depth of field is leaked, so There is no problem because the user can easily adjust the beats by turning the ring.
以上のように、本芙施例によれは、ズームレンズの固定
筒にグラスチレク材、カム環にアルミ材を使用しても、
低温時のカム環回動がスムーズに行なわれ、常温、高温
時の焦点位置ずれを許容レベル内におさえろことかでき
るという効果がある。As mentioned above, according to this embodiment, even if the fixed barrel of the zoom lens is made of glass-tilek material and the cam ring is made of aluminum material,
The cam ring rotates smoothly at low temperatures, and the focus position shift at normal and high temperatures can be kept within an allowable level.
また、Ｉｉ！ｊ足閘１とカム域２との長ざの差を更に大
きく（約１〜２ｍｍ）Ｌ、カム域２の左側又は右側に＆
ばね等を介在さ゛せることでも本発明はｏＪ能である。Also, Ii! j Increase the difference in length between foot lock 1 and cam area 2 by an even larger length (approximately 1 to 2 mm) L, and place it on the left or right side of cam area 2.
The present invention can also be ojed by intervening a spring or the like.
本発明によれば、グラ２チツク材の固定筒が使用できる
ので、＠ｔ、低コストのズームレンズ鏡胴が製作できる
という効果がある。According to the present invention, since a fixed barrel made of glass material can be used, there is an effect that a zoom lens barrel can be manufactured at a low cost.
図は本発明によるズームレンズ鏡筒の−’ＡＭ例のズー
ム部の要部断面図である。The figure is a sectional view of a main part of a zoom portion of a -'AM example of a zoom lens barrel according to the present invention.
Claims (1)
ロツドと、前記変倍系、補正系の位置を制御する溝を有
するカム環と、前記カム環を回動可能に保持する固定筒
とで構成され、前記カム環の回動により、前記変倍系と
補正系を移動させて望遠から広角までズーミングさせる
ようにしたズームレンズ鏡筒において、前記カム環にア
ルミ材、前記固定筒にプラスチツク材を使用して、前記
カム環と固定筒との光軸方向の長さの差が、ズームレン
ズの使用温度範囲内の温度変化による前記カム環と固定
筒との光軸方向の長さの変化の差よりも大きくするとと
もに、前記補正系を摺動させるロツド部のまわりに、前
記補正系を一方向に押しつけるためのばね材を設けて、
前記補正系の光軸方向のガタが低減されていることを特
徴とするズームレンズ鏡部。A variable power system, a correction system, a rod for moving these in the optical axis direction, a cam ring having a groove for controlling the positions of the variable power system and correction system, and a fixing member for rotatably holding the cam ring. In the zoom lens barrel, the cam ring is made of aluminum and the fixed cylinder is made of aluminum, and the cam ring is rotated to move the variable power system and the correction system to zoom from telephoto to wide angle. The difference in length in the optical axis direction between the cam ring and the fixed barrel is determined by the difference in length in the optical axis direction between the cam ring and the fixed barrel due to temperature changes within the operating temperature range of the zoom lens. a spring material for pressing the correction system in one direction around a rod portion on which the correction system slides;
A zoom lens mirror unit, wherein play in the optical axis direction of the correction system is reduced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12514584A JPS615218A (en) | 1984-06-20 | 1984-06-20 | Zoom lens barrel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12514584A JPS615218A (en) | 1984-06-20 | 1984-06-20 | Zoom lens barrel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS615218A true JPS615218A (en) | 1986-01-11 |
Family
ID=14902976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12514584A Pending JPS615218A (en) | 1984-06-20 | 1984-06-20 | Zoom lens barrel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS615218A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62168174U (en) * | 1986-03-06 | 1987-10-24 | ||
| JPH026915A (en) * | 1988-06-27 | 1990-01-11 | Hitachi Ltd | Lens barrel |
| JPH02188708A (en) * | 1989-01-17 | 1990-07-24 | Minolta Camera Co Ltd | Camera with zoom lens |
| JPH0416407U (en) * | 1990-05-30 | 1992-02-10 |
-
1984
- 1984-06-20 JP JP12514584A patent/JPS615218A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62168174U (en) * | 1986-03-06 | 1987-10-24 | ||
| JPH0538446Y2 (en) * | 1986-03-06 | 1993-09-29 | ||
| JPH026915A (en) * | 1988-06-27 | 1990-01-11 | Hitachi Ltd | Lens barrel |
| JPH02188708A (en) * | 1989-01-17 | 1990-07-24 | Minolta Camera Co Ltd | Camera with zoom lens |
| JPH0416407U (en) * | 1990-05-30 | 1992-02-10 |
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