JPH0478965B2 - - Google Patents
Info
- Publication number
- JPH0478965B2 JPH0478965B2 JP57172730A JP17273082A JPH0478965B2 JP H0478965 B2 JPH0478965 B2 JP H0478965B2 JP 57172730 A JP57172730 A JP 57172730A JP 17273082 A JP17273082 A JP 17273082A JP H0478965 B2 JPH0478965 B2 JP H0478965B2
- Authority
- JP
- Japan
- Prior art keywords
- lens barrel
- helicoid screw
- helicoid
- focus lens
- guide portion
- 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
- 230000003287 optical effect Effects 0.000 claims description 16
- 230000005484 gravity Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 description 3
- 230000007257 malfunction Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 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
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lens Barrels (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明はビデオカメラなどに使用して有効なフ
オーカスレンズ群を具備したレンズ鏡胴に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a lens barrel equipped with a focus lens group that is useful for use in video cameras and the like.
従来例の構成とその問題点
レンズ鏡胴に具現されたフオーカス構構におい
て一般的なものはカメラ本体のレンズ取付部に保
持される固定鏡筒、フオーカスレンズ群を保持し
たフオーカスレンズ鏡筒を摺動可能にし、固定鏡
筒に対しフオーカスレンズ鏡筒を回転させて光軸
方向にレンズ群の進退移動を行う機構である。こ
の撮影距離を回転角で調整するためにはヘリコイ
ド環が使われている。このヘリコイドを用いたレ
ンズ鏡胴は、光軸の傾きやずれを防止するために
はヘリコイドのラジアル方向のクリアランスを小
さくすれば良いが、クリアランスを小さくすると
ヘリコイドの回転トルクが増加するため、モータ
等の駆動手段を用いたオートフオーカス機構を付
付た場合はモータの負荷が増加し、出力トルクが
大きい大型のモータを使用しなければ動作不良が
発生する可能性があつた。従つて、消費電力が増
大し、小型のモータを使用した場合は動作が不安
定になり、信頼性が低下する問題があつた。ま
た、ヘリコイドのクリアランスを広げるとヘリコ
イドの摩擦力が小さくなつて回転トルクが減少す
るため、モータ動作の問題は解決することができ
るが、ヘリコイドのラジアルガタによりフオーカ
スレンズ群の傾きやずれのため光学性能が劣化す
る問題があつた。Conventional configurations and their problems A typical focus structure implemented in a lens barrel is a fixed lens barrel that is held in the lens mounting part of the camera body, and a focus lens barrel that holds a group of focus lenses. This is a mechanism that allows the lens group to move forward and backward in the optical axis direction by rotating the focus lens barrel relative to a fixed lens barrel. A helicoid ring is used to adjust the shooting distance using the rotation angle. In lens barrels using helicoids, in order to prevent the optical axis from tilting or shifting, it is sufficient to reduce the clearance in the radial direction of the helicoid, but if the clearance is reduced, the rotational torque of the helicoid increases, so motors, etc. When an autofocus mechanism using a drive means of 1 is attached, the load on the motor increases, and unless a large motor with a large output torque is used, malfunction may occur. Therefore, there are problems in that power consumption increases, and when a small motor is used, operation becomes unstable and reliability decreases. In addition, increasing the clearance of the helicoid reduces the frictional force of the helicoid and reduces the rotational torque, which can solve the motor operation problem, but the radial play of the helicoid causes the focus lens group to tilt or shift There was a problem with performance deterioration.
発明の目的
本発明は上記欠陥を排除し、フオーカスレンズ
群の傾きやずれを防止し、オートフオーカス等の
駆動装置を用いた場合でも円滑な動作が得られる
ようなレンズ鏡胴を提供することを目的としたも
のである。Purpose of the Invention The present invention provides a lens barrel that eliminates the above defects, prevents the focus lens group from tilting or shifting, and allows smooth operation even when using a drive device such as autofocus. It is intended for this purpose.
発明の構成
本発明は、フオーカシングを行うために光軸方
向にレンズが移動可能なフオーカスレンズ群と、
第１のヘリコイドネジと、前記第１のヘリコイ
ドネジと光軸方向に所定の間隔を有し略同心で構
成したリング状の第１のガイド部とを具備し、前
記第１のヘリコイドネジと前記第１のガイド部と
が円筒の同一面側に一体的に形成され、かつ前記
フオーカスレンズ群を保持するフオーカスレンズ
鏡筒と、
前記第１のヘリコイドネジに螺合する第２のヘ
リコイドネジと、前記第１のガイド部と摺接し前
記フオーカスレンズ鏡筒のラジアル方向のガタを
規制するための第２のガイド部とを具備し、前記
第２のヘリコイドネジと前記第２のガイド部とが
一体的に形成された固定鏡筒とを備えたものであ
る。Composition of the Invention The present invention includes a focus lens group whose lenses are movable in the optical axis direction to perform focusing, a first helicoid screw, and a predetermined interval from the first helicoid screw in the optical axis direction. and a ring-shaped first guide section configured substantially concentrically, the first helicoid screw and the first guide section being integrally formed on the same side of a cylinder, and the focus A focus lens barrel that holds a lens group; a second helicoid screw that is screwed into the first helicoid screw; and a second helicoid screw that is in sliding contact with the first guide portion to prevent backlash in the radial direction of the focus lens barrel. and a fixed lens barrel in which the second helicoid screw and the second guide part are integrally formed.
実施例の説明
以下、本発明に係るレンズ鏡胴の一実施例につ
いて図面を参照して詳述する。DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of the lens barrel according to the present invention will be described in detail with reference to the drawings.
図面において、固定鏡筒１はカメラ本体２に固
定されており、固定鏡筒１にはズームレンズ群
L1を光軸に沿つて進退移動させるように回動自
在に装着されたズームリング３および本発明の主
部を成すフオーカスレンズ群L2を保持したフオ
ーカスレンズ鏡筒４が装着されている。このフオ
ーカスレンズ鏡筒４にはヘリコイド雌ネジ（第１
のヘリコイドネジ）４ａが設けられており、固定
鏡筒１に形成されたヘリコイド雄ネジ（第２のヘ
リコイドネジ）１ａと螺合し、光軸方向にフオー
カシング操作が行われるようになつている。この
時、従来のレンズ鏡筒の構成ではヘリコイドネジ
の精度が悪いとフオーカスレンズ鏡筒４のラジア
ル方向のガタは規制できない、また、フオーカス
レンズ群L2の重量が大きい場合はヘリコイドネ
ジ部を支点として光軸がずれる方向にモーメント
がかかつてしまう。 In the drawing, a fixed lens barrel 1 is fixed to a camera body 2, and a zoom lens group is attached to the fixed lens barrel 1.
A zoom ring 3 is rotatably mounted to move L 1 forward and backward along the optical axis, and a focus lens barrel 4 holding a focus lens group L 2 which forms the main part of the present invention is mounted. There is. This focus lens barrel 4 has a helicoid female screw (first
A helicoid screw (second helicoid screw) 4a is provided, and is screwed together with a helicoid male screw (second helicoid screw) 1a formed on the fixed lens barrel 1 to perform a focusing operation in the optical axis direction. At this time, in the conventional lens barrel configuration, if the precision of the helicoid screw is poor, the radial play of the focus lens barrel 4 cannot be controlled, and if the weight of the focus lens group L 2 is large, the helicoid screw A moment is generated in the direction in which the optical axis shifts from the fulcrum.
本発明では、フオーカスレンズ鏡筒４にはヘリ
コイド雌ネジ４ａと光軸方向に所定の間隔を有
し、略同心で構成したリング状の第１のガイド部
４ｂをヘリコイド雌ネジ４ａと同一方向の円周面
上で一体的に有しており、第１のガイド部４ｂは
ヘリコイド雌ネジ４ａよりもフオーカスレンズ鏡
筒４の重心とみなし得る位置に近い側に設けられ
ている。固定鏡筒１には、第１のガイド部４ｂと
摺接し、フオーカスレンズ鏡筒４のラジアル方向
のガタを規制するための第２のガイド部１ｂをヘ
リコイド雄ネジ１ａと一体的に備えており、第２
のガイド部１ｂのガイド幅は第１のガイド部４ｂ
のガイド幅より広く構成され、フオーカシング操
作によつてフオーカスレンズ鏡筒４が光軸方向に
くり出された場合でも、お互いのガイド部がはず
れることなく常に接触しガタを規制できるよう構
成されている。 In the present invention, the focus lens barrel 4 has a ring-shaped first guide portion 4b that has a predetermined distance in the optical axis direction from the helicoid female thread 4a and is substantially concentric with the helicoid female thread 4a. The first guide portion 4b is provided closer to the center of gravity of the focus lens barrel 4 than the helicoid female thread 4a. The fixed lens barrel 1 is integrally provided with a helicoid male screw 1a and a second guide portion 1b that is in sliding contact with the first guide portion 4b and for regulating play in the radial direction of the focus lens barrel 4. Ori, second
The guide width of the guide portion 1b is the same as that of the first guide portion 4b.
The guide width is wider than the width of the guide, and even when the focus lens barrel 4 is extended in the direction of the optical axis due to a focusing operation, the guide parts are always in contact with each other without coming off, thereby preventing play. There is.
また、第１のガイド部４ｂと第２のガイド部１
ｂの接触部はフオーカスレンズ鏡筒の内部に設け
られているため外観上の問題も発生せず、ガイド
部の形状も加工の容易なリング状であるため、精
度を高めることができラジアルガタの防止効果を
高めることができる。 Moreover, the first guide part 4b and the second guide part 1
Since the contact part b is provided inside the focus lens barrel, there are no problems with the appearance, and the shape of the guide part is a ring shape that is easy to process, so accuracy can be improved and radial backlash can be avoided. The prevention effect can be enhanced.
なお、第１のガイド部４ｂは、図面の４ｃの位
置に設けてもよく、この時はICが第２のガイド
部となり、同様の機能を発揮する。 Note that the first guide part 4b may be provided at the position 4c in the drawing, and in this case, the IC becomes the second guide part and performs the same function.
発明の効果
以上の説明から明らかなように、本発明はフオ
ーカシングを行うために光軸方向にレンズが移動
可能なフオーカスレンズ群と、第１のヘリコイド
ネジと、前記第１のヘリコイドネジと光軸方向に
所定の間隔を有し略同心で構成したリング状の第
１のガイド部とを具備し、前記第１のヘリコイド
ネジと前記第１のガイド部とが円筒の同一面側に
一体的に形成され、かつ前記フオーカスレンズ群
を保持するフオーカスレンズ鏡筒と、前記第１の
ヘリコイドネジに螺合する第２のヘリコイドネジ
と、前記第１のガイド部と摺接し前記フオーカス
レンズ鏡筒のラジアル方向のガタを規制するため
の第２のガイド部とを具備し、前記第２のヘリコ
イドネジと前記第２のガイド部とが一体的に形成
された固定鏡筒とを備えているため、ヘリコイド
のラジアル方向のガタがあつてもレンズの光軸の
傾きやずれが防止でき、光学性能を劣化させずに
レンズ群の進退移動が可能になる。また、樹脂成
形で部品を構成した場合でも、金型修正の容易な
リング状のガイド部は精度を高めることができる
ため、金型修正の困難なヘリコイドネジ部の精度
を高めることなく、光軸の傾きやずれを防止でき
る。ヘリコイドのネジ部にはラジアル方向に充分
なクリアランスを設けることで回転トルクを低減
することも可能になり、オートフオーカスに使用
した場合、動作不良を防止でき信頼性を向上でき
る。さらに小型の駆動モータが使用できるため消
費電力・寸法・重量共低減できる。Effects of the Invention As is clear from the above description, the present invention includes a focus lens group whose lenses are movable in the optical axis direction for focusing, a first helicoid screw, and an optical a ring-shaped first guide section that is substantially concentric with a predetermined interval in the axial direction, and the first helicoid screw and the first guide section are integrally formed on the same side of a cylinder. a focus lens barrel that is formed in a shape and holds the focus lens group; a second helicoid screw that is screwed into the first helicoid screw; and a focus lens barrel that is in sliding contact with the first guide portion and that holds the focus lens group. a second guide portion for regulating play in the radial direction of the lens barrel, and a fixed lens barrel in which the second helicoid screw and the second guide portion are integrally formed. Therefore, even if there is play in the radial direction of the helicoid, tilting or shifting of the optical axis of the lens can be prevented, and the lens group can be moved forward and backward without deteriorating optical performance. In addition, even when parts are made of resin molding, the ring-shaped guide part, which is easy to modify the mold, can improve precision, so the optical axis can be adjusted without increasing the precision of the helicoid thread, which is difficult to modify the mold. This prevents tilting and shifting. By providing sufficient clearance in the radial direction for the threaded part of the helicoid, it is also possible to reduce rotational torque, which prevents malfunctions and improves reliability when used for autofocus. Furthermore, since a smaller drive motor can be used, power consumption, size, and weight can be reduced.
また、第１のガイド部と第２のガイド部の摺接
部分は、第１のヘリコイドネジと第２のヘリコイ
ドネジの螺合部よりもフオーカスレンズ鏡筒の重
心に近い側にあり、フオーカスレンズ鏡筒の内周
部で固定鏡筒と摺動するように構成したため、カ
メラアングラの方向がどの様な場合でもレンズの
自重によるラジアルガタを効果的に防止でき、ガ
イド部がレンズ鏡胴の外観に出ないため、操作性
および美観をそこねることがないなどすぐれた効
果が得られる。 Furthermore, the sliding contact portion between the first guide portion and the second guide portion is located closer to the center of gravity of the focus lens barrel than the threaded portion between the first helicoid screw and the second helicoid screw. Since the inner circumference of the cast lens barrel slides against the fixed lens barrel, it is possible to effectively prevent radial wobbling due to the lens' own weight no matter what direction the camera is tilted. Since it does not appear on the outside, excellent effects such as operability and aesthetics are not impaired.
図面は本発明に係るレンズ鏡胴の一実施例を示
す要部側断面図である。
１……固定鏡筒、１ａ……ヘリコイド雄ネジ
（第２のヘリコイドネジ）、１ｂ……第２のガイド
部、４……フオーカスレンズ鏡筒、４ａ……ヘリ
コイド雌ネジ（第１のヘリコイドネジ）、４ｂ…
…第１のガイド部、L2……フオーカスレンズ群。
The drawing is a sectional side view of a main part showing an embodiment of a lens barrel according to the present invention. DESCRIPTION OF SYMBOLS 1... Fixed lens barrel, 1a... Helicoid male screw (second helicoid screw), 1b... Second guide section, 4... Focus lens barrel, 4a... Helicoid female screw (first helicoid screw) screw), 4b...
...first guide section, L 2 ...focus lens group.
Claims (1)
ズが移動可能なフオーカスレンズ群と、 第１のヘリコイドネジと、前記第１のヘリコイ
ドネジと光軸方向に所定の間隔を有し略同心で構
成したリング状の第１のガイド部とを具備し、前
記第１のヘリコイドネジと前記第１のガイド部と
が円筒の同一面側に一体的に形成され、かつ前記
フオーカスレンズ群を保持するフオーカスレンズ
鏡筒と、 前記第１のヘリコイドネジに螺合する第２のヘ
リコイドネジと、前記第１のガイド部と摺接し前
記フオーカスレンズ鏡筒のラジアル方向のガタを
規制するための第２のガイド部とを具備し、前記
第２のヘリコイドネジと前記第２のガイド部とが
一体的に形成された固定鏡筒とを備えたレンズ鏡
胴。 ２ 第１のガイド部と第２のガイド部の摺接部分
は、第１のヘリコイドネジと第２のヘリコイドネ
ジの螺合部よりもフオーカスレンズ鏡筒の重心に
近い側にあり、前記フオーカスレンズ鏡筒の内周
部で固定鏡筒と摺動するように構成した特許請求
の範囲第１項記載のレンズ鏡胴。[Scope of Claims] 1. A focus lens group whose lenses are movable in the optical axis direction to perform focusing, a first helicoid screw, and a focus lens group having a predetermined distance from the first helicoid screw in the optical axis direction. and a ring-shaped first guide section configured substantially concentrically, the first helicoid screw and the first guide section being integrally formed on the same side of a cylinder, and the focus A focus lens barrel that holds a lens group; a second helicoid screw that is screwed into the first helicoid screw; and a second helicoid screw that is in sliding contact with the first guide portion to prevent backlash in the radial direction of the focus lens barrel. What is claimed is: 1. A lens barrel comprising: a fixed lens barrel including a second guide portion for regulating the lens; and a fixed lens barrel in which the second helicoid screw and the second guide portion are integrally formed. 2 The sliding contact portion between the first guide portion and the second guide portion is located closer to the center of gravity of the focus lens barrel than the threaded portion between the first helicoid screw and the second helicoid screw, and The lens barrel according to claim 1, wherein the lens barrel is configured to slide on the fixed lens barrel at an inner peripheral portion of the cast lens barrel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17273082A JPS5961804A (en) | 1982-09-30 | 1982-09-30 | Lens barrel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17273082A JPS5961804A (en) | 1982-09-30 | 1982-09-30 | Lens barrel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5961804A JPS5961804A (en) | 1984-04-09 |
| JPH0478965B2 true JPH0478965B2 (en) | 1992-12-14 |
Family
ID=15947252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17273082A Granted JPS5961804A (en) | 1982-09-30 | 1982-09-30 | Lens barrel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5961804A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107111099B (en) * | 2015-01-27 | 2019-11-22 | 精工爱普生株式会社 | Projector optical apparatus and projector |
| JP6036895B2 (en) * | 2015-03-27 | 2016-11-30 | セイコーエプソン株式会社 | Projection optical device and projector |
| JP6036861B2 (en) * | 2015-01-27 | 2016-11-30 | セイコーエプソン株式会社 | Projection optical device and projector |
| JP6083440B2 (en) * | 2015-01-27 | 2017-02-22 | セイコーエプソン株式会社 | Projection optical device and projector |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5477132A (en) * | 1977-12-01 | 1979-06-20 | Konishiroku Photo Ind Co Ltd | Lens structure |
| JPS55133006A (en) * | 1979-04-04 | 1980-10-16 | Asahi Optical Co Ltd | Close-up photographing changeover device of zoom lens barrel |
-
1982
- 1982-09-30 JP JP17273082A patent/JPS5961804A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5477132A (en) * | 1977-12-01 | 1979-06-20 | Konishiroku Photo Ind Co Ltd | Lens structure |
| JPS55133006A (en) * | 1979-04-04 | 1980-10-16 | Asahi Optical Co Ltd | Close-up photographing changeover device of zoom lens barrel |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5961804A (en) | 1984-04-09 |
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