JP2000321477A - Lens barrel - Google Patents

Lens barrel

Info

Publication number
JP2000321477A
JP2000321477A JP12784699A JP12784699A JP2000321477A JP 2000321477 A JP2000321477 A JP 2000321477A JP 12784699 A JP12784699 A JP 12784699A JP 12784699 A JP12784699 A JP 12784699A JP 2000321477 A JP2000321477 A JP 2000321477A
Authority
JP
Japan
Prior art keywords
cylinder
balls
lens barrel
manual adjustment
power
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
Application number
JP12784699A
Other languages
Japanese (ja)
Other versions
JP3498006B2 (en
Inventor
Takao Ogawa
隆夫 小川
Masaru Yamamoto
勝 山本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sigma Corp
Original Assignee
Sigma Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sigma Corp filed Critical Sigma Corp
Priority to JP12784699A priority Critical patent/JP3498006B2/en
Publication of JP2000321477A publication Critical patent/JP2000321477A/en
Application granted granted Critical
Publication of JP3498006B2 publication Critical patent/JP3498006B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Lens Barrels (AREA)

Abstract

PROBLEM TO BE SOLVED: To obtain a lens barrel which is switched in focus-free mode in the operating direction of a manual adjusting cylinder and can manually be adjusted only when a manual force as 2nd power is obtained. SOLUTION: An interlocking part 11a of the manual adjustment cylinder is arranged in a gap 10a of a clutch ring 10 and springs 12a and 12b and balls 13a and 13b are inserted into the gap at both its ends in the circumferential direction. A slope is so formed that as the balls 13a and 13b move in the spring- side circumferential directions, the gap becomes narrower. When the manual adjustment cylinder is not operated, the balls 13a and 13b are pressed against the end surface of the interlocking part 11a with nearly equal energizing forces by the springs 12a and 12b and then the lens barrel is composed of the outer peripheral surface 9b of a driving cylinder, the elastic forces of the springs 12a and 12b, the diameter of the balls, the slope shape, and the slide resistance between a hold cylinder 7 and the clutch ring 10 so that the balls do not intrude in the tilt surface of the gap 10a and the outer peripheral surface 9b.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明はシステムカメラ、特
に一眼レフカメラの交換レンズの鏡筒に関し、さらに詳
しくは手動による距離環調整が可能なAF一眼レフカメ
ラのレンズ鏡筒に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system camera, and more particularly to a lens barrel of an interchangeable lens of a single-lens reflex camera, and more particularly to a lens barrel of an AF single-lens reflex camera capable of manually adjusting a distance ring.

【0002】[0002]

【従来の技術】第1動力であるモータで距離調整筒を駆
動する、いわゆる自動焦点調整(以下AFとする)カメ
ラにおいて、第2動力である手動での焦点調整(以下M
Fとする)を行う場合、AFとMFの切替機構が具備さ
れていて、これを操作して手動調整を行うことが一般的
である。このような鏡筒は第1動力のモータで駆動して
いる時、距離調整筒は第1動力によって回動するため、
撮影者が不用意に当該調整筒に触れ、焦点作動に影響を
与えることや、該調整筒に対して、撮影状態でのカメラ
と鏡筒の保持に問題があった。このため手動調整筒と距
離調整筒を分離し、手動調整筒を鏡筒の光軸方向にスラ
イドさせるか、あるいは別途切替クラッチを設置して、
AF作動時には手動調整筒を距離調整筒から遮断し、距
離調整筒が作動しても手動調整筒は回動しない方法(こ
れをフォーカスフリーと称して商品化している)が提案
されている。
2. Description of the Related Art In a so-called automatic focus adjustment (hereinafter referred to as AF) camera in which a distance adjusting cylinder is driven by a motor which is a first power, manual focus adjustment (hereinafter referred to as an M) which is a second power.
When performing F), a switching mechanism for AF and MF is provided, and it is common to operate this to perform manual adjustment. When such a lens barrel is driven by a motor of the first power, the distance adjustment barrel is rotated by the first power.
There is a problem that the photographer carelessly touches the adjusting cylinder and affects the focusing operation, and there is a problem in holding the camera and the lens barrel in the photographing state with respect to the adjusting cylinder. For this reason, the manual adjustment cylinder and the distance adjustment cylinder are separated, and the manual adjustment cylinder is slid in the optical axis direction of the lens barrel, or a separate switching clutch is installed,
A method has been proposed in which the manual adjustment cylinder is shut off from the distance adjustment cylinder at the time of AF operation, and the manual adjustment cylinder does not rotate even when the distance adjustment cylinder operates (this is called a focus-free and commercialized).

【0003】[0003]

【発明が解決しようとする課題】しかし、前記フォーカ
スフリーの何れの方式においても切替方向が手動調整筒
の操作方向と異なるため切替操作上円滑さを欠いてい
た。このため、これらの切替操作に対して、第2動力で
ある手動力が得られた時のみ、該手動調整が可能なレン
ズ鏡筒が望まれていた。
However, in any of the above-mentioned focus-free systems, the switching direction is different from the operation direction of the manual adjustment cylinder, so that the switching operation lacks smoothness. For this reason, a lens barrel that can be manually adjusted only when a manual force, which is the second power, is obtained for these switching operations has been desired.

【0004】[0004]

【課題を解決するための手段】そこで本発明では、距離
調整筒に連動した駆動筒と手動調整筒の間に中間リング
およびその付属物からなるクラッチ機構を設け、該手動
調整筒非作動時においては該中間リングは該付属物によ
り、該手動調整筒に対して中立位置に保持され、駆動リ
ングは付属物に対して空転するが、該手動調整筒作動時
は、該手動調整筒が該付属物に作用する事により中間リ
ング、付属物、駆動筒は連結し一体化するため、手動調
整筒が作用するように構成した。
Therefore, in the present invention, a clutch mechanism comprising an intermediate ring and its accessories is provided between a drive cylinder and a manual adjustment cylinder interlocked with a distance adjustment cylinder, and when the manual adjustment cylinder is not operated. The intermediate ring is held in a neutral position with respect to the manual adjustment barrel by the accessory, and the drive ring idles with respect to the accessory. The intermediate ring, accessory and drive cylinder are connected and integrated by acting on the object, so that the manual adjustment cylinder is configured to operate.

【0005】[0005]

【発明の実施の形態】手動調整筒を回転させない時はク
ラッチ機構が解除の状態にあり、AFモードの時AF動
作が行われても手動調整筒は回転しない。そして、MF
モードの時、手動操作動力が手動調整筒に加わった場
合、その手動力でクラッチ機構が連結され、回転力が駆
動筒を回転し、その結果、焦点調整が行われる。
DESCRIPTION OF THE PREFERRED EMBODIMENTS When the manual adjustment cylinder is not rotated, the clutch mechanism is in the released state. In the AF mode, the manual adjustment cylinder does not rotate even if the AF operation is performed. And MF
In the mode, when manual operation power is applied to the manual adjustment cylinder, the clutch mechanism is connected by the manual force, and the rotational force rotates the drive cylinder, and as a result, focus adjustment is performed.

【0006】[0006]

【実施例】以下、図面等を参照して本発明の最も良好な
実施形態を説明する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The best embodiments of the present invention will be described below with reference to the drawings.

【0007】図1は本発明のクラッチ機構を搭載する鏡
筒断面図で、図2はA−A断面における本クラッチ機構
の要部断面図である。図において同じ部材は同じ符号で
示す。
FIG. 1 is a cross-sectional view of a lens barrel on which the clutch mechanism of the present invention is mounted, and FIG. 2 is a cross-sectional view of a main part of the clutch mechanism taken along line AA. In the drawings, the same members are denoted by the same reference numerals.

【0008】図1の鏡筒断面図において、光軸L0を中
心に前部レンズ群L1と後部レンズ群L2が有り、後部
レンズ群L2に対して前部レンズ群L1を直進移動せし
めることにより、焦点調整が可能なレンズ鏡筒の例を示
している。
In the sectional view of the lens barrel shown in FIG. 1, there are a front lens unit L1 and a rear lens unit L2 centered on the optical axis L0, and by moving the front lens unit L1 straight with respect to the rear lens unit L2, 3 shows an example of a lens barrel capable of adjusting focus.

【0009】前部レンズ群L1は保持枠1に、後部レン
ズ群L2は保持枠2で保持されていて、前部レンズ群L
1の保持枠1が固定されている距離調整筒3のヘリコイ
ド部3aと移動筒4のヘリコイド部4aが噛み合ってい
て、固定筒5に対して移動筒4と距離調整筒3は一体で
直進移動出来るようになっている。また内歯筒6は、固
定筒5に対して固定されている保持筒7の突起部7aに
より光軸方向に動きが規制されているが、回転自由に支
持されている。内歯筒6には内径側に内歯6aが形成さ
れており、不図示のカメラ内モータあるいはレンズ内モ
ータより回転力を受けて回転するギヤ列を介して回転す
るピニオン8に噛合している。なお、不図示のギヤ列に
はAF時は動力伝動、MF時は切断する機構が含まれて
いる。そして、該内歯筒6と一体化した駆動筒9には、
内側直進レバー溝9aに、距離調整筒3の固設された連
動レバー3bがはまっているため、内歯筒6の回転を距
離調整筒3に伝えることができ、移動筒4と距離調整筒
3の相対角度の変化により、移動筒4に対する距離調整
筒3、および保持枠1の前部レンズ群L1の直進位置が
変化し、本鏡筒の焦点調整が可能となっている。
The front lens unit L1 is held by a holding frame 1, and the rear lens unit L2 is held by a holding frame 2.
The helicoid portion 3a of the distance adjusting cylinder 3 to which the first holding frame 1 is fixed is engaged with the helicoid portion 4a of the moving cylinder 4, and the moving cylinder 4 and the distance adjusting cylinder 3 move straight with the fixed cylinder 5 integrally. You can do it. The movement of the inner tooth tube 6 in the optical axis direction is restricted by the protrusion 7a of the holding tube 7 fixed to the fixed tube 5, but the inner tooth tube 6 is freely rotatably supported. Internal teeth 6a are formed with internal teeth 6a on the inner diameter side, and mesh with a pinion 8 that rotates via a gear train that rotates by receiving a rotational force from a motor in the camera or a motor in the lens (not shown). . The gear train (not shown) includes a mechanism for transmitting power during AF and a mechanism for disconnecting during MF. The drive cylinder 9 integrated with the inner tooth tube 6 includes:
Since the interlocking lever 3b on which the distance adjusting cylinder 3 is fixed is fitted into the inner straight lever groove 9a, the rotation of the internal tooth tube 6 can be transmitted to the distance adjusting cylinder 3 and the moving cylinder 4 and the distance adjusting cylinder 3 can be transmitted. Changes the relative angle of the distance adjustment barrel 3 with respect to the movable barrel 4 and the straight-moving position of the front lens unit L1 of the holding frame 1 to adjust the focus of the lens barrel.

【0010】さらに、クラッチリング10と嵌合してい
る手動調整筒11は突起部7bにより光軸方向に動きが
規制されつつ回転自由に支持されている。クラッチリン
グ10の外周部には摺動材10gが貼着され、保持筒7
と適度な摺動関係が保たれている。
The manual adjustment cylinder 11 fitted to the clutch ring 10 is supported by the projection 7b so as to be freely rotatable while its movement in the optical axis direction is restricted. A sliding member 10 g is adhered to the outer periphery of the clutch ring 10,
And an appropriate sliding relationship is maintained.

【0011】そして、図2には駆動筒9、クラッチリン
グ10、手動調整筒11の軸方向より見た配置構造が示
されている。クラッチリング10の空隙10aには手動
調整筒11の連動部11aが配設され、その両端の空隙
には周方向にバネ12a,12b、ボール13a,13
bが挿入されている。それぞれのボールがバネ側周方向
に進むにつれ空隙が狭くなるように、傾斜が形成されて
いる。手動調整筒11の非作動時には、バネによる付勢
力でボール13a,13bは連動部11aの端面にそれ
ぞれ同程度の付勢力で押圧することにより、空隙10a
の傾斜面と外周面9bにボールが食い込まないように、
駆動筒9の外周面9b、バネ12a,12bの弾性力、
ボールの径、傾斜形状、保持筒7とクラッチリング10
の摺動抵抗等が構成されている。
FIG. 2 shows the arrangement of the drive cylinder 9, the clutch ring 10, and the manual adjustment cylinder 11 as viewed from the axial direction. An interlocking portion 11a of the manual adjustment cylinder 11 is disposed in a gap 10a of the clutch ring 10, and springs 12a, 12b, balls 13a, 13
b is inserted. The inclination is formed so that the gap becomes narrower as each ball advances in the spring-side circumferential direction. When the manual adjustment cylinder 11 is not operated, the balls 13a and 13b are pressed against the end surfaces of the interlocking portion 11a by the same urging force by the urging force of the springs, respectively.
So that the ball does not cut into the inclined surface and the outer peripheral surface 9b,
The outer peripheral surface 9b of the drive cylinder 9, the elastic force of the springs 12a and 12b,
Ball diameter, inclined shape, holding cylinder 7 and clutch ring 10
And the like.

【0012】次に、作用を説明する。AF時は手動調整
筒11が手で保持されており、バネの付勢力のため、ク
ラッチリング10の傾斜面と外周面9bにボールが食い
込まないような位置に、クラッチリング10が保たれて
いる。そのため、ボールと外周面9bの間には保持力が
働かず、駆動筒9はボールに対して滑動する。
Next, the operation will be described. At the time of AF, the manual adjustment cylinder 11 is held by hand, and the clutch ring 10 is held at a position where the ball does not bite into the inclined surface and the outer peripheral surface 9b of the clutch ring 10 due to the urging force of the spring. . Therefore, no holding force acts between the ball and the outer peripheral surface 9b, and the driving cylinder 9 slides with respect to the ball.

【0013】MF時、手動調整筒11を矢印方向に回す
と、バネ12a、ボール13aを介して端面10bを付
勢する事によりクラッチリング10は回転力を受ける
が、この時クラッチリング10自身の慣性力およびクラ
ッチリング10と保持筒7の摺動抵抗により、クラッチ
リング10はボールに対して遅れ気味に動く。その結
果、ボール13aは空隙10aの傾斜面および外周面9
bに食い込むことになり、クラッチリング10と駆動筒
9は一体化し、矢印の方向に回される。そして、手動調
整筒11の回転を止めると、慣性力によりクラッチリン
グ10と駆動筒9は遅れて停止する。その結果、ボール
13aと連動部11aは離間することになり、バネ12
aにより、ボールの食い込み状態が解除される。なお、
MF時は不図示のギヤユニットにおいて、モータとピニ
オン8の連動が遮断されているため、内歯筒6が回転し
ても、モータは回転せず、負荷にはならない。
At the time of MF, when the manual adjustment cylinder 11 is turned in the direction of the arrow, the clutch ring 10 receives a rotational force by urging the end face 10b via the spring 12a and the ball 13a. Due to the inertial force and the sliding resistance between the clutch ring 10 and the holding cylinder 7, the clutch ring 10 moves slightly behind the ball. As a result, the ball 13a is inclined by the inclined surface
As a result, the clutch ring 10 and the driving cylinder 9 are integrated and turned in the direction of the arrow. When the rotation of the manual adjustment cylinder 11 is stopped, the clutch ring 10 and the driving cylinder 9 stop with a delay due to the inertial force. As a result, the ball 13a and the interlocking portion 11a are separated from each other, and the spring 12
By a, the biting state of the ball is released. In addition,
At the time of MF, in the gear unit (not shown), the interlock between the motor and the pinion 8 is interrupted. Therefore, even if the internal tooth tube 6 rotates, the motor does not rotate and does not become a load.

【0014】また、図3及び図4は本発明の別の実施例
の斜視図と断面図を示したもので、クラッチリングと手
動調整筒を変形したものである。
FIGS. 3 and 4 are a perspective view and a sectional view of another embodiment of the present invention, in which a clutch ring and a manual adjustment cylinder are modified.

【0015】図3において、クラッチリング10dに
は、突起10e、10fが形成されている。そして、手
動調整筒11bには2つのクラッチ板11c、11dが
一体形成されており、構成材料と形状の関係で弾性を有
する。
In FIG. 3, projections 10e and 10f are formed on the clutch ring 10d. The two clutch plates 11c and 11d are formed integrally with the manual adjustment cylinder 11b, and have elasticity in relation to the constituent material and the shape.

【0016】このクラッチ機構は図4に示すように構成
され、手動操作力が加わらない場合、底面11f,11
gは駆動筒9cの外周面9bと若干の空隙を有してい
る。手動調整筒11bを矢印12の方向に回転させる
と、クラッチリング10dの慣性およびクラッチリング
と固定筒5との摺動抵抗により、突起10eの抵抗を受
けるため、矢印13の方向に力を受け変位する。そのた
め突起10eの底面11fが駆動筒9cの外周面を押圧
して、摩擦結合し、駆動筒9cと手動調整筒11bが一
体回転する。次に回転を停止した場合、クラッチリング
10dは若干遅れて停止する。そのため、弾性力により
手動調整筒11bには矢印13の方向とは逆向きに復元
力が働き、外周面9bの押圧力が解除される。
This clutch mechanism is configured as shown in FIG. 4, and when no manual operation force is applied, the bottom surfaces 11f, 11
g has a slight gap with the outer peripheral surface 9b of the driving cylinder 9c. When the manual adjustment cylinder 11b is rotated in the direction of the arrow 12, the inertia of the clutch ring 10d and the sliding resistance between the clutch ring and the fixed cylinder 5 receive the resistance of the projection 10e. I do. Therefore, the bottom surface 11f of the projection 10e presses the outer peripheral surface of the driving cylinder 9c to be frictionally coupled, and the driving cylinder 9c and the manual adjustment cylinder 11b rotate integrally. Next, when the rotation is stopped, the clutch ring 10d stops with a slight delay. Therefore, a restoring force acts on the manual adjustment cylinder 11b in the direction opposite to the direction of the arrow 13 due to the elastic force, and the pressing force on the outer peripheral surface 9b is released.

【0017】以上説明したように、クラッチリングと駆
動筒の間を連結させるものにはボールを用いているが、
もちろん円筒コロ等でも構わないし、転動体でなくて
も、くさび等であっても構わない。さらに、説明には1
組のクラッチユニットのみを示しているが、複数あって
も構わない。
As described above, the ball is used to connect the clutch ring and the drive cylinder.
Of course, it may be a cylindrical roller or the like, and may not be a rolling element, but may be a wedge or the like. In addition, 1
Although only a set of clutch units is shown, a plurality of clutch units may be provided.

【0018】また、説明にはクラッチの押圧方向が径方
向に働くように構成したが、光軸方向でも構わないし、
クラッチリングと手動調整筒の機構関係を逆にしても構
わない。
In the description, the clutch is pressed so as to act in the radial direction. However, the clutch may be pressed in the optical axis direction.
The mechanical relationship between the clutch ring and the manual adjustment cylinder may be reversed.

【0019】[0019]

【発明の効果】以上説明したように本発明の構成によれ
ば、任意の角度方向でのクラッチの連動、分離が可能な
他、手動調整筒等を光軸方向に前後させたりする必要も
無くなるため、コンパクトな構成にすることも可能とな
る。
As described above, according to the structure of the present invention, the clutch can be interlocked and disengaged in any angle direction, and it is not necessary to move the manual adjustment cylinder back and forth in the optical axis direction. Therefore, a compact configuration can be achieved.

【図面の簡単な説明】[Brief description of the drawings]

【図1】実施例の鏡筒断面図である。FIG. 1 is a sectional view of a lens barrel according to an embodiment.

【図2】実施例のA−A断面図である。FIG. 2 is a sectional view taken along line AA of the embodiment.

【図3】別の実施例のクラッチ機構を示す斜視図であ
る。
FIG. 3 is a perspective view showing a clutch mechanism of another embodiment.

【図4】図3のクラッチ機構の断面図である。FIG. 4 is a sectional view of the clutch mechanism shown in FIG. 3;

【符号の説明】[Explanation of symbols]

1 保持枠 2 保持枠 3 距離調整筒 3b 連動レバー 4 移動筒 5 固定筒 6 内歯筒 7 保持筒 8 ピニオン 9 駆動筒 10 クラッチリング 11 手動調整筒 DESCRIPTION OF SYMBOLS 1 Holding frame 2 Holding frame 3 Distance adjusting cylinder 3b Interlocking lever 4 Moving cylinder 5 Fixed cylinder 6 Internal tooth tube 7 Holding cylinder 8 Pinion 9 Drive cylinder 10 Clutch ring 11 Manual adjustment cylinder

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 第1動力であるモータ動力によって光軸
のレンズ位置を移動可能にした距離調整筒を有するレン
ズ鏡筒において、前記第1動力による該距離調整筒の駆
動に対しては無関係であり、第2動力が得られた時のみ
距離調整筒に連結し、前記第2動力による距離調整筒の
駆動を可能にするクラッチ機構を具備したことを特徴と
するレンズ鏡筒。
1. A lens barrel having a distance adjustment barrel whose lens position on the optical axis can be moved by a motor power as a first power, regardless of the driving of the distance adjustment cylinder by the first power. A lens barrel having a clutch mechanism that is connected to the distance adjusting cylinder only when the second power is obtained and enables the distance adjusting cylinder to be driven by the second power.
【請求項2】 前記クラッチ機構は、前記第2動力が得
られた時、当該動力の起動力で作動せしめ、その起動方
向に従って距離調整が可能となることを特徴とする請求
項1に記載のレンズ鏡筒。
2. The method according to claim 1, wherein when the second power is obtained, the clutch mechanism is operated by a starting force of the power, and the distance can be adjusted in accordance with the starting direction. Lens barrel.
JP12784699A 1999-05-10 1999-05-10 Lens barrel Expired - Lifetime JP3498006B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12784699A JP3498006B2 (en) 1999-05-10 1999-05-10 Lens barrel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12784699A JP3498006B2 (en) 1999-05-10 1999-05-10 Lens barrel

Publications (2)

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JP2000321477A true JP2000321477A (en) 2000-11-24
JP3498006B2 JP3498006B2 (en) 2004-02-16

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002311323A (en) * 2001-04-17 2002-10-23 Sigma Corp Lens barrel
US11243373B2 (en) 2019-02-08 2022-02-08 Panasonic Intellectual Property Management Co., Ltd. Lens barrel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002311323A (en) * 2001-04-17 2002-10-23 Sigma Corp Lens barrel
US11243373B2 (en) 2019-02-08 2022-02-08 Panasonic Intellectual Property Management Co., Ltd. Lens barrel

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