JPH08254644A - Lens barrel and optical instrument using it - Google Patents

Lens barrel and optical instrument using it

Info

Publication number
JPH08254644A
JPH08254644A JP8315795A JP8315795A JPH08254644A JP H08254644 A JPH08254644 A JP H08254644A JP 8315795 A JP8315795 A JP 8315795A JP 8315795 A JP8315795 A JP 8315795A JP H08254644 A JPH08254644 A JP H08254644A
Authority
JP
Japan
Prior art keywords
cam
lens
cam ring
roller
ring
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
Application number
JP8315795A
Other languages
Japanese (ja)
Inventor
Futoshi Kai
太 甲斐
Shigeo Nakajima
中嶋  茂雄
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP8315795A priority Critical patent/JPH08254644A/en
Publication of JPH08254644A publication Critical patent/JPH08254644A/en
Pending legal-status Critical Current

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  • Lens Barrels (AREA)

Abstract

PURPOSE: To smoothly drive and control a lens frame by engaging a lens holding frame with a cam ring and driving and controlling the cam ring by using a cam roller engaging with a cam groove provided at the cam ring and preventing the cause of a damage due to hitting on the wall surface of the cam groove. CONSTITUTION: (A) shows a housing state and (B) shows the intermediate states of the movement of first and second lens groups at the time of moving from the housing state to a photographing state. Also, (C) shows the state where the focal distance of a photographing lens is at a wide end, and (D) shows the state where it is at a telephoto end. Then, the cross-sectional shape of a fixed cam roller 12 is made to be elliptical and the contact face of the wall surface of a cam part 32b and the cam roller 12 becomes large even if the force of impact or the like from an outside is added to the lens frame in the photographing state, so that the damage caused by being hit is not made on the wall surface of the cam groove 32. Also, it is set so as to cope with the shape of the cam part 32a and the cam roller 12, and the cam roller 12 abuts on the terminal of the cam part 32a at the time of the completion of collapsing operation, so that the cam part 32a is prevented from being damaged by receiving impact force from the lens frame with a part having a wide width.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明はレンズ鏡筒及びそれを用
いた光学機器に関し、特に物体を撮像したり、物体像を
観察系で観察する撮影時に物体側の第1レンズ群を固定
又は移動させるタイプのズームレンズや単焦点距離レン
ズ等の撮影レンズを収納するレンズ鏡筒において撮影時
以外の非撮影時のレンズ鏡筒全体の小型化を図った、例
えば携帯性に優れたビデオカメラ等に好適なものであ
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens barrel and an optical apparatus using the same, and more particularly to fixing or moving a first lens unit on the object side during image pickup of an object or observation of an object image with an observation system. In a lens barrel that houses a shooting lens such as a zoom lens or a fixed focal length lens, the overall size of the lens barrel is reduced when not shooting except when shooting, such as a video camera with excellent portability. It is suitable.

【0002】[0002]

【従来の技術】従来よりビデオカメラ等の光学機器にお
いては、撮影時、例えば変倍やフォーカスの時に物体側
の第1レンズ群を固定にした、所謂、前玉固定式のズー
ムレンズが種々と用いられている。この前玉固定式のズ
ームレンズを保持するレンズ鏡筒においては多くの場
合、第1レンズ群を保持する第1保持枠を固定部材(固
定筒)に固着している。この為レンズ鏡筒の全長は撮影
時及び非撮影時において常に一定であった。
2. Description of the Related Art Conventionally, in optical equipment such as video cameras, various so-called front lens fixed type zoom lenses in which a first lens unit on the object side is fixed at the time of photographing, for example, during zooming or focusing, have been widely used. It is used. In many cases, in the lens barrel that holds the fixed front lens type zoom lens, the first holding frame that holds the first lens group is fixed to the fixing member (fixed barrel). Therefore, the total length of the lens barrel was always constant during shooting and non-shooting.

【0003】これに対して本出願人は特願平7−376
71号において第1レンズ群を保持する第1保持枠と第
2レンズ群を保持する第2保持枠を同一のカム環に係合
させ、該カム環に設けたカム機構により変倍操作の際に
は該第1保持枠と第2保持枠の光軸方向の相対的間隔を
変化させ、変倍操作以外のとき、該第2保持枠に対して
設けた該カム機構のカムリフトが0となるようにして該
第1保持枠と該第2保持枠をその相対位置を一定にしつ
つ、光軸方向に移動できるようにした沈胴動作機構を有
したレンズ鏡筒を提案している。
On the other hand, the present applicant has filed Japanese Patent Application No. 7-376
In No. 71, when the first holding frame holding the first lens group and the second holding frame holding the second lens group are engaged with the same cam ring, and a zoom mechanism is operated by a cam mechanism provided on the cam ring. The relative distance between the first holding frame and the second holding frame in the optical axis direction is changed so that the cam lift of the cam mechanism provided for the second holding frame becomes 0 when the zooming operation is not performed. In this way, there is proposed a lens barrel having a collapsing operation mechanism that allows the first holding frame and the second holding frame to move in the optical axis direction while keeping their relative positions constant.

【0004】同公報ではこれにより非撮影時の光学機器
全体の小型化を図り、例えば携帯性を良くしたカメラ一
体型のビデオカメラ等に好適なレンズ鏡筒及びそれを用
いた光学機器を達成している。
According to this publication, the size of the optical device as a whole when not shooting is reduced, and a lens barrel and an optical device using the lens barrel suitable for a camera-integrated video camera having improved portability are achieved. ing.

【0005】一般に沈胴動作においてはカム環を回動さ
せて行っている。このとき移動用のレンズ群を保持する
レンズ保持枠と係合するカム環を固定筒に設けた断面形
状が円形のカムコロと該カム環のカム溝とを係合させる
ことにより駆動制御している。
Generally, in the collapsing operation, the cam ring is rotated. At this time, drive control is performed by engaging a cam roller having a circular cross-sectional shape, which is provided in the fixed cylinder, with a cam ring that engages with a lens holding frame that holds the moving lens group, and the cam groove of the cam ring. .

【0006】[0006]

【発明が解決しようとする課題】撮影状態において前玉
枠(第1保持枠)が物体側へ繰り出しているときに外部
から前玉枠に落下や衝撃等の力がかかる場合がある。
When the front lens frame (first holding frame) is extended toward the object side in a photographing state, a force such as a drop or a shock may be applied to the front lens frame from the outside.

【0007】このとき図7に示すように前玉枠に連結し
た円形の固定カムコロ71がカム環73に形成した前玉
枠移動用のカム溝74の壁面に衝打して打痕傷Paが生
じる。そうするとカム溝74の打痕傷Paが生じた領域
を固定カムコロ71が通過すると変倍中では結像位置の
ずれとなってきて、又固定カムコロ71が打痕傷Paを
領域を乗り越える際にカム環の作動負荷が変動して、円
滑なる駆動制御が難しくなってくるという問題点が生じ
てくる。
At this time, as shown in FIG. 7, the circular fixed cam roller 71 connected to the front lens frame hits the wall surface of the cam groove 74 for moving the front lens frame formed in the cam ring 73, and the dent scratch Pa is generated. Occurs. Then, when the fixed cam roller 71 passes through the area of the cam groove 74 in which the dent scratch Pa is generated, the image-forming position shifts during zooming, and when the fixed cam roller 71 crosses the dent scratch Pa over the area, the cam moves. The operating load of the ring fluctuates, which makes it difficult to perform smooth drive control.

【0008】本発明は、撮影状態において前玉枠が物体
側へ繰り出しているときに外部から前玉枠に落下や衝撃
等の力が加わっても、カムコロの形状又はカム機構を適
切に設定することによりカム溝の壁面に打痕傷が生じな
いようにし、前玉枠を円滑に駆動制御することのできる
レンズ鏡筒及びそれを用いた光学機器の提供を目的とす
る。
The present invention properly sets the shape of the cam roller or the cam mechanism even when a force such as a drop or an impact is applied to the front lens frame from the outside while the front lens frame is being extended toward the object side in the photographing state. Accordingly, it is an object of the present invention to provide a lens barrel and an optical device using the lens barrel, which can prevent the front wall of the front lens frame from being smoothly driven without causing a dent or scratch on the wall surface of the cam groove.

【0009】[0009]

【課題を解決するための手段】本発明のレンズ鏡筒は、 (1−1)レンズを保持する保持枠をカム環に係合さ
せ、該カム環を該カム環に設けたカム溝と係合する断面
形状が長円形のカムコロを利用して駆動制御しているこ
とを特徴としている。特に、前記カムコロの断面形状は
光軸と直交方向に長い長円形であることを特徴としてい
る。
A lens barrel according to the present invention comprises: (1-1) engaging a holding frame for holding a lens with a cam ring, the cam ring engaging with a cam groove provided in the cam ring. It is characterized in that drive control is performed using a cam roller having an oval cross section. In particular, the cam roller is characterized in that its cross-sectional shape is an ellipse elongated in the direction orthogonal to the optical axis.

【0010】(1−2)レンズを保持する保持枠をカム
環に係合させ、該カム環を該カム環に設けたカム溝と係
合するカムコロを利用して駆動制御する際、該カム環を
付勢部材で所定方向に付勢していることしている。特
に、前記付勢部材は前記カム環を光軸方向に付勢してい
ることや、前記カムコロは断面形状が長円形であること
等を特徴としている。
(1-2) When the holding frame for holding the lens is engaged with the cam ring, and the cam ring is engaged with the cam groove provided in the cam ring to drive and control the cam, The ring is biased in a predetermined direction by a biasing member. In particular, the urging member is urging the cam ring in the optical axis direction, and the cam roller has an oval cross section.

【0011】(1−3)物体側の第1レンズ群を保持す
る第1保持枠をカム環に係合させ、該カム環のカム溝に
係合する固定筒に設けた断面形状が長円形の固定カムコ
ロを利用して該第1保持枠を該固定筒に対して駆動制御
していることを特徴としている。特に、前記固定カムコ
ロの断面形状は光軸と直交する方向に長い長円形である
ことを特徴としている。
(1-3) The first holding frame for holding the first lens unit on the object side is engaged with the cam ring, and the fixed cylinder engaged with the cam groove of the cam ring has an oval cross section. The first holding frame is drive-controlled with respect to the fixed barrel by using the fixed cam roller. In particular, the cross section of the fixed cam roller is an ellipse elongated in the direction orthogonal to the optical axis.

【0012】(1−4)物体側の第1レンズ群を保持す
る第1保持枠をカム環に係合させ、該カム環に設けたカ
ム溝と該カム溝と係合する断面形状が長円形のカムコロ
を利用して、該カム環を変倍操作の際には光軸方向に固
定とし、変倍操作以外のときは光軸方向に駆動制御して
いることを特徴としている。特に、前記カムコロの断面
形状は光軸と直交方向に長い長円形であることを特徴と
している。
(1-4) The first holding frame for holding the first lens unit on the object side is engaged with the cam ring, and the cam groove provided in the cam ring and the cross-sectional shape engaging with the cam groove are long. It is characterized in that a circular cam roller is used to fix the cam ring in the optical axis direction during the magnification changing operation, and to drive and control the cam ring in the optical axis direction except during the magnification changing operation. In particular, the cam roller is characterized in that its cross-sectional shape is an ellipse elongated in the direction orthogonal to the optical axis.

【0013】本発明の光学機器は、 (2−1)レンズを保持する保持枠をカム環に係合さ
せ、該カム環を該カム環に設けたカム溝と係合する断面
形状が長円形のカムコロを利用して駆動制御するレンズ
鏡筒を有した光学機器により物体を所定面上に結像させ
ていることを特徴としている。
(2-1) The optical device of the present invention has (2-1) an oval-shaped cross section for engaging a holding frame for holding a lens with a cam ring and engaging the cam ring with a cam groove provided in the cam ring. It is characterized in that an object is imaged on a predetermined surface by an optical device having a lens barrel which is driven and controlled by using the cam roller.

【0014】(2−2)レンズを保持する保持枠をカム
環に係合させ、該カム環を該カム環に設けたカム溝と係
合するカムコロを利用して駆動制御する際、該カム環を
付勢部材で所定方向に付勢しているレンズ鏡筒を有した
光学機器により物体を所定面上に結像させていることを
特徴としている。
(2-2) When the holding frame for holding the lens is engaged with the cam ring and the cam ring is engaged with the cam groove provided in the cam ring for drive control, the cam is used. It is characterized in that an object is imaged on a predetermined surface by an optical device having a lens barrel for urging the ring in a predetermined direction by a urging member.

【0015】(2−3)物体側の第1レンズ群を保持す
る第1保持枠をカム環に係合させ、該カム環のカム溝に
係合する固定筒に設けた断面形状が長円形の固定カムコ
ロを利用して該第1保持枠を該固定筒に対して駆動制御
するレンズ鏡筒を有した光学機器により物体を所定面上
に結像させていることを特徴としている。
(2-3) The first holding frame for holding the first lens unit on the object side is engaged with the cam ring, and the fixed cylinder engaged with the cam groove of the cam ring has an oval cross section. It is characterized in that an object is imaged on a predetermined surface by an optical device having a lens barrel for driving and controlling the first holding frame with respect to the fixed barrel by utilizing the fixed cam roller.

【0016】(2−4)物体側の第1レンズ群を保持す
る第1保持枠をカム環に係合させ、該カム環に設けたカ
ム溝と該カム溝と係合する断面形状が長円形のカムコロ
を利用して、該カム環を変倍操作の際には光軸方向に固
定とし、変倍操作以外のときは光軸方向に駆動制御する
レンズ鏡筒を有した光学機器により物体を所定面上に結
像させていることを特徴としている。
(2-4) The first holding frame for holding the first lens unit on the object side is engaged with the cam ring, and the cam groove provided in the cam ring and the cross-sectional shape engaging with the cam groove are long. By using a circular cam roller, the cam ring is fixed in the direction of the optical axis during the magnification changing operation, and the object is provided by an optical device having a lens barrel for controlling the driving in the direction of the optical axis during the magnification changing operation. Is imaged on a predetermined surface.

【0017】[0017]

【実施例】図1,図2は各々本発明の実施例1の要部断
面図である。図1は撮影時、図2は非撮影時の鏡筒の収
納時(沈胴時)を示している。図3は図1の一部分の説
明図である。
1 and 2 are sectional views of the essential portions of Embodiment 1 of the present invention. FIG. 1 shows the time of photographing, and FIG. 2 shows the time of non-photographing when the lens barrel is stored (when retracted). FIG. 3 is an explanatory view of a part of FIG.

【0018】図中1は撮影時(変倍及びフォーカスや物
体の観察時)に固定の第1レンズ群、2は変倍用の第2
レンズ群、3は撮影時に固定の第3レンズ群、4は変倍
に伴う像面変動を補正する為、及びフォーカスの際に光
軸上移動する第4レンズ群である。
In the figure, 1 is a first lens group which is fixed during image pickup (magnification and focusing and observation of an object), and 2 is a second lens for zooming.
The lens group 3 is a third lens group which is fixed at the time of photographing, and the fourth lens group 4 is a fourth lens group which moves on the optical axis for correcting the image plane variation due to zooming and at the time of focusing.

【0019】5は前玉枠(第1保持枠)であり、第1レ
ンズ群1を保持している。6はカム環であり、前玉枠5
内で回動している。7はカム環インナーギアであり、カ
ム環6の内側に設けられている。11は前玉枠用直進キ
ー部であり、カム環6のスラスト方向の後からの押えを
兼ねた枠8と一体的に設けている。9は2群枠用直進溝
で、前玉枠5に形成している。10は前玉枠用直進溝で
あり、固定筒15に設けられている。
Reference numeral 5 denotes a front lens frame (first holding frame), which holds the first lens group 1. 6 is a cam ring, which is a front lens frame 5
It is rotating inside. Reference numeral 7 denotes a cam ring inner gear, which is provided inside the cam ring 6. Reference numeral 11 denotes a straight-movement key portion for the front lens frame, which is provided integrally with the frame 8 which also serves as a retainer from the rear in the thrust direction of the cam ring 6. 9 is a straight groove for the second group frame, which is formed in the front lens frame 5. 10 is a straight groove for the front lens frame, which is provided in the fixed cylinder 15.

【0020】16は第4レンズ駆動用のステップモー
タ、17は沈胴及び変倍の際の駆動用のズームモータ、
18は連動ギアであり、カム環インナーギア7と噛合し
ている。19はズームモータ17からの駆動力を伝える
出力軸である。12は断面形状が長円形の固定カムコロ
であり、固定筒15と一体となっており、カム環6に設
けたカム溝32に係合している。又固定カムコロ12は
光軸と直交方向に長い長円形となっている。
Reference numeral 16 is a stepping motor for driving the fourth lens, 17 is a zooming motor for driving when retracting and changing the magnification,
Reference numeral 18 denotes an interlocking gear, which meshes with the cam ring inner gear 7. An output shaft 19 transmits the driving force from the zoom motor 17. Reference numeral 12 is a fixed cam roller having an oval cross section, which is integrated with the fixed barrel 15 and is engaged with a cam groove 32 provided in the cam ring 6. The fixed cam roller 12 has an elliptical shape that is long in the direction orthogonal to the optical axis.

【0021】本実施例では3個以上の固定カムコロと3
本のカム溝をレンズ鏡筒の前方から見たとき、120度
おきに配置し、第1レンズ群1の倒れ偏心を防止してい
る。図では1か所のみを示している。13は2群カムコ
ロであり、2群移動枠(第2保持枠)14と一体的に設
けており、カム環6に設けたカム穴と係合し、更にその
先端部は2群枠用直進溝9に係合している。2群移動枠
14には3個以上の2群カムコロ13と3本のカム溝を
レンズ鏡筒の前方から見たとき120度おきに配置し、
第2レンズ群2の倒れ偏心を防止している。図では1か
所のみを示している。
In this embodiment, there are three or more fixed cam rollers and three fixed cam rollers.
The cam grooves of the book are arranged every 120 degrees when viewed from the front of the lens barrel to prevent the first lens group 1 from tilting and decentering. In the figure, only one place is shown. Reference numeral 13 denotes a second group cam roller, which is integrally provided with a second group moving frame (second holding frame) 14, engages with a cam hole provided in the cam ring 6, and further has a tip end thereof for a second group frame straight advance. It is engaged with the groove 9. In the second group moving frame 14, three or more second group cam rollers 13 and three cam grooves are arranged every 120 degrees when viewed from the front of the lens barrel,
The tilt decentering of the second lens group 2 is prevented. In the figure, only one place is shown.

【0022】20は2群移動枠14と一体的に設けた腕
部分である。21はステップモータ16の出力軸であ
り、その外周部にはオネジ加工をしている。22はラッ
ク部材、23はラックバネであり、ラック部材22のラ
ック歯を出力軸21のオネジ部に圧接する圧接力を発生
させている。ラック22はスラストがなく、4群移動枠
(第4保持枠)30に取着している。24は第4レンズ
群4の回り止めバー、25は第4レンズ群4の移動用の
案内バーであり、4群移動枠30と一体のスリーブと嵌
合し、第4レンズ群4の倒れ偏心を防止している。
Reference numeral 20 is an arm portion provided integrally with the second-group moving frame 14. Reference numeral 21 denotes an output shaft of the step motor 16, which has a male thread on its outer peripheral portion. Reference numeral 22 is a rack member, and 23 is a rack spring, which generates a pressing force for pressing the rack teeth of the rack member 22 to the male screw portion of the output shaft 21. The rack 22 has no thrust and is attached to the fourth group moving frame (fourth holding frame) 30. Reference numeral 24 denotes a detent bar of the fourth lens group 4, reference numeral 25 denotes a guide bar for moving the fourth lens group 4, which is fitted with a sleeve integral with the fourth group moving frame 30 to make the fourth lens group 4 fall eccentric. Is being prevented.

【0023】29はボリュームエンコーダユニットであ
り、ブラシ部28とブラシ部28と一体の連結部27を
有し、これらは腕部分20に連結している。ブラシ部2
8が図中、左右方向に移動し、抵抗体(不図示)上の接
触位置が変化し、これよりエンコーダ7からの出力値が
接触位置に応じて変化し、第2レンズ群2の光軸方向の
位置を検出している。26は絞り部である。
A volume encoder unit 29 has a brush portion 28 and a connecting portion 27 which is integral with the brush portion 28, and these are connected to the arm portion 20. Brush part 2
8 moves in the left-right direction in the figure, the contact position on the resistor (not shown) changes, and the output value from the encoder 7 changes accordingly, and the optical axis of the second lens group 2 changes. The direction position is detected. Reference numeral 26 is a diaphragm portion.

【0024】本実施例において撮影時に図1に示すよう
に2群移動枠14が実線の位置(テレ端)にあるとき、
ズームモータ17が所定方向に回動すると出力軸19及
び連動ギア18を介してカム環インナーギア部7に動力
が伝達され、カム環6が所定方向に回動する。このとき
固定カムコロ12はカム環6上のカム溝32のカムリフ
トを有していない(カムリフトが0)領域32bに位置
するようにしており(図3(D))、これによりカム環
6が回動しても第1レンズ群1が光軸方向に移動しない
ようにしている。
In this embodiment, when the second group moving frame 14 is at the position of the solid line (tele end) as shown in FIG.
When the zoom motor 17 rotates in a predetermined direction, power is transmitted to the cam ring inner gear portion 7 via the output shaft 19 and the interlocking gear 18, and the cam ring 6 rotates in a predetermined direction. At this time, the fixed cam roller 12 is positioned in the region 32b where the cam groove 32 on the cam ring 6 does not have a cam lift (cam lift is 0) (FIG. 3 (D)), whereby the cam ring 6 rotates. The first lens group 1 does not move in the optical axis direction even if it moves.

【0025】一方、2群カムコロ13はカム環6上のカ
ム溝31のカムリフトを持たせた領域31aに位置して
おり、これによりカム環6の回動に伴って第2レンズ群
2が2点鎖線で示した位置(ワイド端)まで光軸上を移
動するようにしている(図3(C))。このときボリュ
ームエンコーダ29によって第2レンズ群2の光軸方向
の位置を検出している。カム環6は前玉枠5と枠8によ
ってスラスト方向とラジアル方向とも嵌合ガタが所定量
以下に押えられた中で回動している。
On the other hand, the second group cam roller 13 is located in the area 31a provided with the cam lift of the cam groove 31 on the cam ring 6, so that the second lens group 2 is moved to the second group 2 as the cam ring 6 rotates. It is arranged to move on the optical axis to the position (wide end) indicated by the dotted line (FIG. 3 (C)). At this time, the volume encoder 29 detects the position of the second lens group 2 in the optical axis direction. The cam ring 6 is rotated in the thrust direction and the radial direction by the front lens frame 5 and the frame 8 while the fitting play is held below a predetermined amount.

【0026】この際、前玉枠5用の直進キー11と直進
溝10の係合により第1レンズ群1は回動せず静止して
おり、又、2群カムコロ13と2群枠用直進溝9の係合
により2群移動枠14も回動せずに直進移動している。
At this time, the first lens group 1 is stationary without rotating due to the engagement of the straight advance key 11 for the front lens frame 5 and the straight advance groove 10, and the second group cam roller 13 and the straight advance for the second group frame. Due to the engagement of the groove 9, the second group moving frame 14 also moves straight without rotating.

【0027】図2は図1の2点鎖線の2群移動枠14の
位置から(即ち撮影時から非撮影時となったときに)更
にズームモータ17を所定方向に回動することによって
第1レンズ群1の沈胴動作を行い、収納状態(非撮影状
態)としたときを示している。このときカム環6上の固
定カムコロ12と2群カムコロ13との関係は図3
(C),図3(B),そして図3(A)へと順次変位し
ている。
FIG. 2 shows the first movement by further rotating the zoom motor 17 in a predetermined direction from the position of the second group moving frame 14 indicated by the two-dot chain line in FIG. It shows a state in which the lens group 1 is retracted and brought into a stored state (non-photographing state). At this time, the relationship between the fixed cam roller 12 on the cam ring 6 and the second group cam roller 13 is shown in FIG.
(C), FIG. 3 (B), and FIG. 3 (A).

【0028】本実施例では図1の撮影状態から図2の収
納状態への過程では図3(C),(B),(A)に示す
ように2群移動枠14用の2群カムコロ13はカムリフ
トが0となる領域31bを移動させている。
In the present embodiment, in the process from the photographing state of FIG. 1 to the stored state of FIG. 2, as shown in FIGS. 3C, 3B and 3A, the second group cam roller 13 for the second group moving frame 14 is provided. Moves the area 31b where the cam lift is zero.

【0029】これにより第1レンズ群1と第2レンズ群
2の相対的位置関係は一定となり、固定カムコロ12と
係合したカム溝が所定のカムリフトを有する位置までカ
ム環6を回動させて前玉枠5を直進させながら沈胴し、
図2の収納状態に至るようにしている。
As a result, the relative positional relationship between the first lens group 1 and the second lens group 2 becomes constant, and the cam ring 6 is rotated until the cam groove engaged with the fixed cam roller 12 has a predetermined cam lift. While retracting while moving the front lens frame 5 straight,
The storage state of FIG. 2 is reached.

【0030】次に図3(A)〜(D)に示したカム環6
のカム機構の展開状態について説明する。同図において
左右方向はカム環6の回動角を示し、上下方向は光軸方
向の位置を示している。又、前述の説明のように実際に
は第1レンズ群1と第2レンズ群2は共に倒れ偏心の除
去の目的で3本以上のカム部を用いて位置決めしている
が、同図では簡単の為に1本のカム部についてのみ図示
している。
Next, the cam ring 6 shown in FIGS.
The deployed state of the cam mechanism will be described. In the figure, the left-right direction indicates the rotation angle of the cam ring 6, and the up-down direction indicates the position in the optical axis direction. Further, as described above, both the first lens group 1 and the second lens group 2 are actually positioned using three or more cam portions for the purpose of removing the tilt eccentricity, but in FIG. Therefore, only one cam portion is shown in the figure.

【0031】図3(A)は収納状態を示し(図2に相
当)、図3(B)は収納状態から撮影状態へ移動する際
の第1レンズ群1と第2レンズ群2の移動の中間状況を
示している。図3(C)は撮影レンズの焦点距離がワイ
ド端の状態を示し(図1の2点鎖線)、図3(D)はテ
レ端の状態(図1の実線)を示している。図3(C)と
図3(D)の中間状況で中間の焦点距離をとっている。
FIG. 3A shows the housed state (corresponding to FIG. 2), and FIG. 3B shows the movement of the first lens group 1 and the second lens group 2 when moving from the housed state to the photographing state. The intermediate situation is shown. 3C shows a state in which the focal length of the taking lens is at the wide end (two-dot chain line in FIG. 1), and FIG. 3D shows a state at the tele end (solid line in FIG. 1). The intermediate focal length is taken in the intermediate situation between FIG. 3 (C) and FIG. 3 (D).

【0032】図3において34は、例えばピント面上の
光軸の位置である。Aは固定カムコロ12を示し、Bは
2群カムコロ13を示している。固定カムコロ12と2
群カムコロ13は前述のように直進キー11と2群枠用
直進溝9により係合されているので、図3(A)〜図3
(D)とも紙面で光軸から左右方向の位置(相対距離)
は変わらない。
In FIG. 3, reference numeral 34 indicates the position of the optical axis on the focus plane, for example. A shows the fixed cam roller 12, and B shows the second group cam roller 13. Fixed cam rollers 12 and 2
Since the group cam roller 13 is engaged with the straight-moving key 11 and the second group frame straight-moving groove 9 as described above, FIGS.
In (D), the position in the left-right direction from the optical axis (relative distance)
Does not change.

【0033】カム環6には前玉枠用のカム部32と2群
移動枠用のカム部31が設けられており、それぞれのカ
ム部は図示したようにカムリフトが0のフラット部(0
カム部)31b,32bとカムリフトを有する部分(傾
きカム部)31a,32aとを合わせ持っている。
The cam ring 6 is provided with a cam portion 32 for the front lens frame and a cam portion 31 for the second group moving frame. Each cam portion has a flat portion (0
The cam portions 31b and 32b and the portions having the cam lift (tilt cam portions) 31a and 32a are held together.

【0034】又、固定カムコロ12は図3(C)と図3
(D)との間で、即ち撮影状態において前玉枠5が外部
から衝撃力を受けてもカム溝に打痕傷がつかないように
断面形状が長円形としている。この為それに係合するカ
ム部32りフラット部32bは通常の形状となっている
が収納時用の傾きカム部32aのカム溝は図3に示すよ
うに幅の広い形状となっている。
The fixed cam roller 12 is shown in FIG. 3 (C) and FIG.
Between (D), that is, in the photographing state, the front lens frame 5 has an oval cross section so that the cam groove is not dented even if an impact force is applied from the outside. For this reason, the flat portion 32b of the cam portion 32 that engages with it has a normal shape, but the cam groove of the tilted cam portion 32a for storage has a wide shape as shown in FIG.

【0035】図3(A)は収納状態であり、ピント面3
4からカム環6の後端部6aまでの距離はCであり最も
短い。2群カムコロ13はカムリフトが0でフラット部
31bの最奥位置にあるので、この状態から矢印33の
方向にカム環6が回動してもカム環6と第2レンズ群2
の間の相対位置関係は変わらない(即ち、第1レンズ群
1と第2レンズ群2との間の相対位置関係も変わらな
い)。
FIG. 3 (A) shows the state of storage and the focusing surface 3
The distance from 4 to the rear end 6a of the cam ring 6 is C, which is the shortest. Since the second group cam roller 13 has the cam lift 0 and is located at the deepest position of the flat portion 31b, even if the cam ring 6 rotates in the direction of the arrow 33 from this state, the cam ring 6 and the second lens group 2
Does not change (that is, the relative position relationship between the first lens group 1 and the second lens group 2 does not change).

【0036】一方、固定カムコロ12はカムリフトを有
する部分32aの最奥にあるので矢印33の方向にカム
環6を回動することにより前玉枠5は繰り出される(即
ち、第1レンズ群1と第2レンズ群2とが一体的に繰り
出す)。
On the other hand, since the fixed cam roller 12 is at the innermost part of the portion 32a having the cam lift, the front lens frame 5 is extended by rotating the cam ring 6 in the direction of the arrow 33 (that is, the first lens group 1 and The second lens group 2 is integrally extended).

【0037】図3(B)はこの中間状況でピント位置3
4からカム環の後端部6aまでの距離はB(B>C)と
なる。更に矢印33方向にカム環6が回動すると図3
(C)の状態となり、固定カムコロ12はフラット部3
2bに入り、逆に2群カムコロ13はカムリフトを有す
る傾きカム部31aの入口に配置される。この際、ピン
ト面34からカム環6の後端部6aまでの距離はAとな
る(A>B)。この状態が図1の2点鎖線の状態であ
る。ここから更に矢印33の方向にカム環6を回動させ
ると図3(D)の状態(テレ端の状態)になる。
FIG. 3B shows the focus position 3 in this intermediate situation.
The distance from 4 to the rear end 6a of the cam ring is B (B> C). When the cam ring 6 is further rotated in the direction of the arrow 33, FIG.
In the state of (C), the fixed cam roller 12 has the flat portion 3
2b, and conversely, the second group cam roller 13 is arranged at the entrance of the tilt cam portion 31a having a cam lift. At this time, the distance from the focusing surface 34 to the rear end portion 6a of the cam ring 6 is A (A> B). This state is the state of the chain double-dashed line in FIG. From here, when the cam ring 6 is further rotated in the direction of the arrow 33, the state shown in FIG.

【0038】本実施例では固定カムコロ12の断面形状
を長円形とし、撮影状態(図3(C)と図3(D)との
間)においてカメラが落下したり、外部からの衝撃等の
力が前玉枠5に加わってもカム部32bの壁面と固定カ
ムコロ12の接触面が大きくなるようにしてカム溝32
の壁面に打痕傷がつかないようにしている。又カム部3
2aの形状を固定カムコロ12に対応させて設定し、沈
胴動作の終了時(図3(A))には固定カムコロ12が
カム部32aの終端の平面部分に当接するようにし、前
玉枠5からの衝撃力を幅の広い部分で受けるようにして
カム部32aに傷が付かないようにしている。
In this embodiment, the fixed cam roller 12 has an oval cross-section, and the camera is dropped in the photographing state (between FIG. 3C and FIG. 3D) or a force such as an external impact is applied. Even if is added to the front lens frame 5, the contact surface between the wall surface of the cam portion 32b and the fixed cam roller 12 becomes large so that the cam groove 32
The wall surface of the is not scratched. Also cam part 3
The shape of 2a is set in correspondence with the fixed cam roller 12, and at the end of the collapsing operation (FIG. 3 (A)), the fixed cam roller 12 is brought into contact with the flat end portion of the cam portion 32a, and the front lens frame 5 The wider impact force is applied to the cam portion 32a so that the cam portion 32a is not damaged.

【0039】又、本実施例によれば唯一のカム環6と唯
一のモータ17により撮影状態の変倍時には固定されて
いる第1レンズ群を収納時には沈胴させている。
Further, according to this embodiment, the first cam group 6 and the only motor 17 retract the first lens group, which is fixed during zooming of the photographing state, during storage.

【0040】又、本実施例では第2レンズ群2がワイド
端にあるときの第1レンズ群1と第2レンズ群2の相対
位置関係を維持したまま第2レンズ群2の変倍時のスト
ロークと同じ量だけ第1レンズ群1を沈胴させている。
Further, in this embodiment, when the second lens group 2 is zoomed while maintaining the relative positional relationship between the first lens group 1 and the second lens group 2 when the second lens group 2 is at the wide end. The first lens group 1 is retracted by the same amount as the stroke.

【0041】一般に小型化の為にワイド端での第1レン
ズ群1と第2レンズ群2の間隔は各種の誤差を考慮して
もメカ的にぶつからない範囲での最短距離になるよう、
又、テレ端の絞りと第2レンズ群も最短距離になるよう
設計されることが多い。
Generally, in order to reduce the size, the distance between the first lens group 1 and the second lens group 2 at the wide end is set to be the shortest distance within a range in which mechanical collision does not occur even if various errors are taken into consideration.
Also, the aperture stop at the telephoto end and the second lens group are often designed to have the shortest distance.

【0042】本実施例では変倍での第2レンズ群の移動
量と収納時の沈胴量を一致させ、これにより最も効率の
良い沈胴効果を得ている。この為、図3のカム機構にお
いてカム部31とカム部32のリフト量を一致させてい
る。
In this embodiment, the amount of movement of the second lens unit during zooming and the amount of collapse of the lens unit during storage are made the same, thereby obtaining the most efficient collapse effect. Therefore, in the cam mechanism of FIG. 3, the lift amounts of the cam portion 31 and the cam portion 32 are made equal to each other.

【0043】図4は本実施例におけるズームレンズを構
成する第1,第2,第3,第4レンズ群の光軸方向の移
動軌跡を示す説明図である。図4(A),(C),
(D)の各レンズ群の位置が図3(A),(C),
(D)と各々対応している。
FIG. 4 is an explanatory diagram showing the loci of movement of the first, second, third and fourth lens groups constituting the zoom lens in this embodiment in the optical axis direction. 4 (A), (C),
The positions of the respective lens groups in (D) are shown in FIGS. 3 (A), (C),
Each corresponds to (D).

【0044】図5は本発明の実施例2の撮影時の要部概
略図である。図6は図5のカム環52の説明図である。
FIG. 5 is a schematic view of the essential portions of the second embodiment of the present invention during shooting. FIG. 6 is an explanatory diagram of the cam ring 52 of FIG.

【0045】本実施例は固定カムコロ61の断面形状は
従来と同様に円形とし(これに応じてカム溝62のカム
形状も従来通りである。)、新たに付勢部材として環状
のバネ部材51を設けてカム環52の付勢を行ってい
る。これにより図6に示すように固定カムコロ61がカ
ム溝62のカム部62bの打痕傷のつかない壁に当接す
るようにしている。これらの点が実施例1に比べて異な
っており、その他の構成は同じである。
In this embodiment, the fixed cam roller 61 has a circular cross-sectional shape as in the conventional case (the cam shape of the cam groove 62 is also the same as the conventional one), and an annular spring member 51 is newly added as a biasing member. Is provided to urge the cam ring 52. As a result, as shown in FIG. 6, the fixed cam roller 61 comes into contact with the wall of the cam portion 62b of the cam groove 62 which is not dented. These points are different from the first embodiment, and other configurations are the same.

【0046】本実施例ではこのような構成により固定カ
ムコロ61の断面形状が円形であってもカム溝62のカ
ム部62bに衝撃力による打痕傷が生じてもそれに影響
されないで円滑な駆動制御ができるようにしている。
According to this embodiment, even if the fixed cam roller 61 has a circular cross-sectional shape, even if the cam portion 62b of the cam groove 62 is dented or scratched by an impact force, it is not affected and the drive control is smoothly performed. I am able to

【0047】尚、本実施例において固定カムコロ61を
実施例1と同様に断面形状が長円形のものを用いても良
く、これによれば更に良好なる駆動制御が容易となる。
In this embodiment, the fixed cam roller 61 may have an oval cross-section as in the first embodiment, which facilitates better drive control.

【0048】[0048]

【発明の効果】本発明によれば以上のように、撮影状態
において前玉枠が物体側へ繰り出しているときに外部か
ら前玉枠に落下や衝撃等の力が加わっても、カムコロの
形状又はカム機構を適切に設定することによりカム溝の
壁面に打痕傷が生じないようにし、前玉枠を円滑に駆動
制御することのできるレンズ鏡筒及びそれを用いた光学
機器を達成することができる。
As described above, according to the present invention, even when a force such as a drop or an impact is applied to the front lens frame from the outside while the front lens frame is being extended to the object side in the photographing state, the shape of the cam roller is formed. Or, by properly setting the cam mechanism, it is possible to achieve a lens barrel and an optical device using the lens barrel, which can prevent the scratches from being formed on the wall surface of the cam groove and smoothly drive and control the front lens frame. You can

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

【図1】本発明の実施例1の撮影時の要部断面図FIG. 1 is a sectional view of an essential part of a first embodiment of the present invention at the time of shooting.

【図2】本発明の実施例1の非撮影時の要部断面図FIG. 2 is a cross-sectional view of essential parts of the first embodiment of the present invention during non-imaging

【図3】図1のカム環のカム機構の展開説明図FIG. 3 is a development explanatory view of a cam mechanism of the cam ring of FIG.

【図4】本発明の実施例1に係るズームレンズのレンズ
断面図
FIG. 4 is a lens cross-sectional view of the zoom lens according to Embodiment 1 of the present invention.

【図5】本発明の実施例2の撮影時の要部断面図FIG. 5 is a cross-sectional view of the essential parts at the time of shooting according to the second embodiment of the present invention.

【図6】本発明の実施例2のカム環のカム機構の展開説
明図
FIG. 6 is a development explanatory diagram of a cam mechanism of a cam ring according to a second embodiment of the present invention.

【図7】従来のカム環のカム機構の展開説明図FIG. 7 is an explanatory diagram showing the development of a conventional cam mechanism for a cam ring.

【符号の説明】[Explanation of symbols]

5 前玉枠(第1保持枠) 6,52 カム環 8 枠 9 2群枠用直進溝 10 前玉枠用直進溝 11 前玉枠用直進キー 12,61 固定カムコロ 13 2群カムコロ 14 2群移動枠(第2保持枠) 31,32,62 カム部 51 付勢部材 5 Front lens frame (1st holding frame) 6,52 Cam ring 8 Frame 9 2nd group Frame straight groove 10 Front lens frame straight groove 11 Front lens frame straight key 12,61 Fixed cam roller 13 2nd group cam roller 14 2nd group Moving frame (second holding frame) 31, 32, 62 Cam portion 51 Biasing member

Claims (13)

【特許請求の範囲】[Claims] 【請求項1】 レンズを保持する保持枠をカム環に係合
させ、該カム環を該カム環に設けたカム溝と係合する断
面形状が長円形のカムコロを利用して駆動制御している
ことを特徴とするレンズ鏡筒。
1. A holding frame for holding a lens is engaged with a cam ring, and drive control is performed by using a cam roller having an oval cross section for engaging the cam ring with a cam groove provided in the cam ring. A lens barrel characterized in that
【請求項2】 前記カムコロの断面形状は光軸と直交方
向に長い長円形であることを特徴とする請求項1のレン
ズ鏡筒。
2. The lens barrel according to claim 1, wherein the cam roller has an oval cross section that is long in a direction orthogonal to the optical axis.
【請求項3】 レンズを保持する保持枠をカム環に係合
させ、該カム環を該カム環に設けたカム溝と係合する断
面形状が長円形のカムコロを利用して駆動制御するレン
ズ鏡筒を有した光学機器により物体を所定面上に結像さ
せていることを特徴とする光学機器。
3. A lens which is driven and controlled by using a cam roller having an oval cross section for engaging a holding frame for holding the lens with a cam ring and engaging the cam ring with a cam groove provided in the cam ring. An optical device characterized in that an object is imaged on a predetermined surface by an optical device having a lens barrel.
【請求項4】 レンズを保持する保持枠をカム環に係合
させ、該カム環を該カム環に設けたカム溝と係合するカ
ムコロを利用して駆動制御する際、該カム環を付勢部材
で所定方向に付勢していることを特徴とするレンズ鏡
筒。
4. A cam ring is attached when a holding frame for holding a lens is engaged with a cam ring and the cam ring is engaged with a cam groove provided in the cam ring for drive control. A lens barrel characterized by being biased in a predetermined direction by a biasing member.
【請求項5】 前記付勢部材は前記カム環を光軸方向に
付勢していることを特徴とする請求項4のレンズ鏡筒。
5. The lens barrel according to claim 4, wherein the urging member urges the cam ring in the optical axis direction.
【請求項6】 前記カムコロは断面形状が長円形である
ことを特徴とする請求項4又は5のレンズ鏡筒。
6. The lens barrel according to claim 4, wherein the cam roller has an oval cross section.
【請求項7】 レンズを保持する保持枠をカム環に係合
させ、該カム環を該カム環に設けたカム溝と係合するカ
ムコロを利用して駆動制御する際、該カム環を付勢部材
で所定方向に付勢しているレンズ鏡筒を有した光学機器
により物体を所定面上に結像させていることを特徴とす
る光学機器。
7. A cam ring is attached when a holding frame for holding a lens is engaged with the cam ring and the cam ring is driven and controlled by using a cam roller engaged with a cam groove provided in the cam ring. An optical device, wherein an object is imaged on a predetermined surface by an optical device having a lens barrel that is biased in a predetermined direction by a biasing member.
【請求項8】 物体側の第1レンズ群を保持する第1保
持枠をカム環に係合させ、該カム環のカム溝に係合する
固定筒に設けた断面形状が長円形の固定カムコロを利用
して該第1保持枠を該固定筒に対して駆動制御している
ことを特徴とするレンズ鏡筒。
8. A fixed cam roller having an oval cross section provided on a fixed barrel that engages with a cam ring of a first holding frame that holds the first lens unit on the object side and engages with a cam groove of the cam ring. The lens barrel is characterized in that the first holding frame is drive-controlled with respect to the fixed barrel by utilizing.
【請求項9】 前記固定カムコロの断面形状は光軸と直
交する方向に長い長円形であることを特徴とする請求項
8のレンズ鏡筒。
9. The lens barrel according to claim 8, wherein a cross-sectional shape of the fixed cam roller is an ellipse elongated in a direction orthogonal to the optical axis.
【請求項10】 物体側の第1レンズ群を保持する第1
保持枠をカム環に係合させ、該カム環のカム溝に係合す
る固定筒に設けた断面形状が長円形の固定カムコロを利
用して該第1保持枠を該固定筒に対して駆動制御するレ
ンズ鏡筒を有した光学機器により物体を所定面上に結像
させていることを特徴とする光学機器。
10. A first lens unit for holding a first lens unit on the object side.
The holding frame is engaged with the cam ring, and the first holding frame is driven with respect to the fixed barrel by using a fixed cam roller having an oval cross section provided in the fixed barrel that engages with the cam groove of the cam ring. An optical device in which an object is imaged on a predetermined surface by an optical device having a lens barrel to be controlled.
【請求項11】 物体側の第1レンズ群を保持する第1
保持枠をカム環に係合させ、該カム環に設けたカム溝と
該カム溝と係合する断面形状が長円形のカムコロを利用
して、該カム環を変倍操作の際には光軸方向に固定と
し、変倍操作以外のときは光軸方向に駆動制御している
ことを特徴とするレンズ鏡筒。
11. A first lens unit for holding a first lens unit on the object side.
The holding frame is engaged with the cam ring, and a cam groove provided in the cam ring and a cam roller having an oval cross-section that engages with the cam ring are used. A lens barrel characterized in that it is fixed in the axial direction, and is driven and controlled in the optical axis direction except during zooming.
【請求項12】 前記カムコロの断面形状は光軸と直交
方向に長い長円形であることを特徴とする請求項11の
レンズ鏡筒。
12. The lens barrel according to claim 11, wherein a sectional shape of the cam roller is an ellipse elongated in a direction orthogonal to the optical axis.
【請求項13】 物体側の第1レンズ群を保持する第1
保持枠をカム環に係合させ、該カム環に設けたカム溝と
該カム溝と係合する断面形状が長円形のカムコロを利用
して、該カム環を変倍操作の際には光軸方向に固定と
し、変倍操作以外のときは光軸方向に駆動制御するレン
ズ鏡筒を有した光学機器により物体を所定面上に結像さ
せていることを特徴とする光学機器。
13. A first lens holding a first lens unit on the object side.
The holding frame is engaged with the cam ring, and a cam groove provided in the cam ring and a cam roller having an oval cross-section that engages with the cam ring are used. An optical device characterized in that an object is imaged on a predetermined surface by an optical device having a lens barrel which is fixed in the axial direction and is controlled to be driven in the optical axis direction except during zooming operation.
JP8315795A 1995-03-15 1995-03-15 Lens barrel and optical instrument using it Pending JPH08254644A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8315795A JPH08254644A (en) 1995-03-15 1995-03-15 Lens barrel and optical instrument using it

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8315795A JPH08254644A (en) 1995-03-15 1995-03-15 Lens barrel and optical instrument using it

Publications (1)

Publication Number Publication Date
JPH08254644A true JPH08254644A (en) 1996-10-01

Family

ID=13794419

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8315795A Pending JPH08254644A (en) 1995-03-15 1995-03-15 Lens barrel and optical instrument using it

Country Status (1)

Country Link
JP (1) JPH08254644A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004170961A (en) * 2002-11-01 2004-06-17 Pentax Corp Rotary ring support structure of lens barrel and rotary ring support structure
WO2009093475A1 (en) * 2008-01-25 2009-07-30 Panasonic Corporation Lens barrel
JP2011138079A (en) * 2009-12-30 2011-07-14 Sony Corp Lens barrel and imaging apparatus
US8373934B2 (en) 2010-06-14 2013-02-12 Panasonic Corporation Lens barrel

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004170961A (en) * 2002-11-01 2004-06-17 Pentax Corp Rotary ring support structure of lens barrel and rotary ring support structure
WO2009093475A1 (en) * 2008-01-25 2009-07-30 Panasonic Corporation Lens barrel
JPWO2009093475A1 (en) * 2008-01-25 2011-05-26 パナソニック株式会社 Lens barrel
US8223441B2 (en) 2008-01-25 2012-07-17 Panasonic Corporation Lens barrel
US8456755B2 (en) 2008-01-25 2013-06-04 Panasonic Corporation Lens barrel
JP2011138079A (en) * 2009-12-30 2011-07-14 Sony Corp Lens barrel and imaging apparatus
US8373934B2 (en) 2010-06-14 2013-02-12 Panasonic Corporation Lens barrel
US8526122B2 (en) 2010-06-14 2013-09-03 Panasonic Corporation Lens barrel

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