JPH09159902A - Lens barrel - Google Patents

Lens barrel

Info

Publication number
JPH09159902A
JPH09159902A JP7345021A JP34502195A JPH09159902A JP H09159902 A JPH09159902 A JP H09159902A JP 7345021 A JP7345021 A JP 7345021A JP 34502195 A JP34502195 A JP 34502195A JP H09159902 A JPH09159902 A JP H09159902A
Authority
JP
Japan
Prior art keywords
holding frame
envelope
forms
clearance hole
cave
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
JP7345021A
Other languages
Japanese (ja)
Inventor
Hiroshi Okano
宏 岡野
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.)
Nikon Corp
Original Assignee
Nikon 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 Nikon Corp filed Critical Nikon Corp
Priority to JP7345021A priority Critical patent/JPH09159902A/en
Publication of JPH09159902A publication Critical patent/JPH09159902A/en
Pending legal-status Critical Current

Links

Landscapes

  • Lens Barrels (AREA)

Abstract

PROBLEM TO BE SOLVED: To prevent light from being leaked from space between cylindrical members fitted with each other in a multipoint contact method by providing a holding frame member with a step part formed to be projected from an envelope and providing the step part with a through-hole opened at a position forming a step difference from the envelope. SOLUTION: A 3rd holding frame 6 is provided with the step part 6b and a clearance hole 6d formed at a position where the step difference 6c of the step part 6b intervenes in between, and its inside diameter forms an octagonal pole, its surface forms a projection part 28 and a part abutting on a ridge forms a cave-in part 29. The projection part 28 forms the envelope 27 of the cylindrical surface and the clearance hole 6d is arranged at an angular position overlapped on the projection part 28 in the direction of an optical axis O. When the light enters, it reaches the step part 6b because the cave-in part 29 forms a gap, but it is prevented from straight advancing by the step part 6b and straight advancing light can not reach the entrance of the clearance hole 6d. Stray light in the cave-in part 29 happens to enter the step part 6b but it can not advance in the clearance hole 6b because of directional deviation between the cave-in part 29 and the optical axis O. The stray light does not enter the clearance hole 6d because of the height of the step difference 6c.

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、レンズ鏡筒に関す
る。なかでもレンズ鏡筒の円筒部材の形状に関する。
TECHNICAL FIELD The present invention relates to a lens barrel. Above all, it relates to the shape of the cylindrical member of the lens barrel.

【0002】[0002]

【従来の技術】レンズ鏡筒にはそれぞれの機能を有する
複数の光軸を中心軸とする円筒部材が設けられている。
相互に嵌合している2本の円筒部材の一方に、駆動機構
による駆動力が伝達されると、一方の円筒部材は他方の
円筒部材の内径又は外径と接触しながら回転運動又は直
進運動をする。従来、円筒部材は金属材料を旋盤により
切削加工して製作されていたから、形状精度が良く、充
分な真円度が確保されていた。従って相互に嵌合する2
個の円筒部材の接触面は、互いに面による良好な接触状
況にあった。しかし近年レンズ鏡筒を大量且つ廉価に生
産するため、部品のプラスチック化が進み、円筒部材に
もプラスチック材料が多用されるようになっている。プ
ラスチック材料の円筒部材は一般にモールド成形法によ
り製作され、その表面の形状精度は、切削加工により製
作される金属製の円筒部材の表面の形状精度と比較して
劣っている。特に充分な真円度の確保は困難である。そ
のため、一方又は双方がプラスチック製の円筒部材が相
互に嵌合するとき、相互の接触状況は必ずしも良好では
なく、摺動、回転運動が円滑に行われないことが起こっ
た。プラスチック材料の円筒部材の真円度を改善するた
めに、モールドの修正を行うが、円筒形状に修正するの
は実際上困難である。そこで、モールドの修正を容易に
行い得る形状にして、いわゆる多点接触法を採用し、接
触状況の向上を図っている。これは、一方又は双方がプ
ラスチック製の円筒部材が相互に嵌合するとき、一方の
プラスチック製の円筒部材の嵌合する面を、例えば多数
の平面からなる多角柱状に形成して、多角柱を多数の稜
で円筒面と接触させる接触法である。この多点接触法に
より、回転運動が円滑に行われるようになった。
2. Description of the Related Art A lens barrel is provided with a cylindrical member having a plurality of optical axes as respective central axes.
When the driving force from the driving mechanism is transmitted to one of the two cylindrical members fitted to each other, the one cylindrical member makes a rotational motion or a rectilinear motion while being in contact with the inner diameter or the outer diameter of the other cylindrical member. do. Conventionally, the cylindrical member has been manufactured by cutting a metal material with a lathe, so that the shape accuracy is good and sufficient roundness is ensured. Therefore they fit together 2
The contact surfaces of the individual cylindrical members were in good contact with each other. However, in recent years, in order to mass-produce lens barrels at low cost, plastic parts have been developed, and plastic materials are often used for cylindrical members. A cylindrical member made of a plastic material is generally manufactured by a molding method, and its surface shape accuracy is inferior to that of a metal cylindrical member manufactured by cutting. In particular, it is difficult to secure sufficient roundness. Therefore, when one or both of the plastic cylindrical members are fitted to each other, the mutual contact condition is not always good, and sliding and rotating motions may not be performed smoothly. In order to improve the roundness of the cylindrical member made of a plastic material, the mold is modified, but it is practically difficult to modify it into a cylindrical shape. Therefore, the so-called multi-point contact method is adopted so that the mold can be easily modified to improve the contact condition. This is because when one or both plastic cylindrical members are fitted to each other, the fitting surface of one plastic cylindrical member is formed into, for example, a polygonal columnar shape composed of a large number of flat surfaces to form a polygonal columnar shape. This is a contact method in which a large number of edges are in contact with a cylindrical surface. By this multi-point contact method, the rotational movement has become smooth.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、いわゆ
る多点接触法では、全円筒面による接触でなく、接触は
部分的な面や、多数の線、又は多数の点で行なわれるた
めに、相互に嵌合する2個の円筒部材の間に光の通過可
能な隙間が形成される。この隙間を漏出してレンズ鏡筒
に入射した光がフィルム到達すると、漏光による画像の
劣化が生起するという問題があった。
However, in the so-called multi-point contact method, the contact is not made by an all-cylindrical surface, but the contact is made at a partial surface, a large number of lines, or a large number of points. A gap through which light can pass is formed between the two cylindrical members that are fitted together. When the light leaking through this gap and entering the lens barrel reaches the film, there is a problem that image deterioration due to the light leak occurs.

【0004】本発明は上記の課題に鑑み、多点接触法に
より相互に嵌合する2個の円筒部材の間からの漏光がな
いレンズ鏡筒を提供することを目的とする。
SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a lens barrel in which light is not leaked between two cylindrical members fitted to each other by the multipoint contact method.

【0005】[0005]

【課題を解決するための手段】本発明は、光軸を中心軸
とする円筒面を有する第1の部材と、突起部を有し、前
記突起部の包絡面が円筒面を形成する第2の部材とを具
備し、前記第1の部材と前記第2の部材が、前記円筒面
と前記包絡面とで相互に嵌合するレンズ鏡筒において、
前記第2の部材は、前記包絡面より突出して形成された
段部を有し、前記段部は、前記突起部に対し前記光軸方
向の重複する角度位置に開口する貫通孔を具備するレン
ズ鏡筒を構成した。又、光軸を中心軸とする円筒面を有
する第1の部材と、突起部を有し、前記突起部の包絡面
が円筒面を形成する第2の部材とを具備し、前記第1の
部材と前記第2の部材が、前記円筒面と前記包絡面で相
互に嵌合するレンズ鏡筒において、前記第2の部材は、
前記包絡面より突出して形成された段部を有し、前記段
部は、前記包絡面より段差を設けた位置に開口する貫通
孔を具備するレンズ鏡筒を構成した。
According to the present invention, there is provided a first member having a cylindrical surface having an optical axis as a central axis, a protrusion, and an envelope surface of the protrusion forming a cylindrical surface. A lens barrel in which the first member and the second member are fitted to each other at the cylindrical surface and the envelope surface,
The second member has a step portion formed so as to project from the envelope surface, and the step portion has a through hole that opens at an overlapping angular position in the optical axis direction with respect to the protrusion portion. The lens barrel was constructed. Also, the first member having a cylindrical surface having the optical axis as a central axis and the second member having a protrusion and having an envelope surface of the protrusion forming a cylindrical surface are provided. In the lens barrel in which the member and the second member are fitted to each other at the cylindrical surface and the envelope surface, the second member is
The lens barrel has a step portion that is formed so as to project from the envelope surface, and the step portion has a through hole that opens to a position where a step is provided from the envelope surface.

【0006】[0006]

【発明の実施の形態】単焦点、多焦点及びズームレンズ
鏡筒に実施される。
DETAILED DESCRIPTION OF THE INVENTION Implemented in monofocal, multifocal and zoom lens barrels.

【0007】本発明の実施の一形態を図1により説明す
る。図1に示すズームレンズ鏡筒の光学系は第1レンズ
群L1、第2レンズ群L2、第3レンズ群L3、及び第
4レンズ群L4から構成されている。第1レンズ群L
1、第2レンズ群L2、第3レンズ群L3、及び第4レ
ンズ群L4は変倍用のレンズ群であり、更に第2レンズ
群L2は合焦用を兼ねるレンズ群である。
An embodiment of the present invention will be described with reference to FIG. The optical system of the zoom lens barrel shown in FIG. 1 includes a first lens unit L1, a second lens unit L2, a third lens unit L3, and a fourth lens unit L4. First lens group L
The first, second lens group L2, third lens group L3, and fourth lens group L4 are lens groups for zooming, and the second lens group L2 is also a lens group for focusing.

【0008】固定筒1は後部にカメラボディ(不図示)
と結合するバヨネットマウント2を備え、逃げ溝1a、
逃げ孔1b、直進溝1c、孔1dが形成されている。又
合焦用のエンコーダパターン3が設けられている。カム
筒4は固定筒1の内径に回動可能に嵌合し、直進溝4
a、カム溝4b、カム溝4c、カム溝4d、逃げ孔4
e、逃げ孔4fが形成されている。第4保持枠5は第4
レンズ群L4を保持し、カム筒4の内周に保持され、逃
げ孔5a、逃げ孔5bが形成されている。第3保持枠6
は第3レンズ群L3を保持し、第4保持枠5の内周に保
持されるプラスチック成形部材である。第3保持枠6に
は逃げ孔6aが形成されている。又、内径側に段部6b
が設けられ、又段部6bの段差6cを隔てた位置に、光
軸に平行な方向に貫通する逃げ孔6dが設けられてい
る。第2保持枠7は第2レンズ群L2を保持し、第3保
持枠6の内周に保持されている。第1保持枠8は第1レ
ンズ群L1を保持し、第3保持枠6及びカム筒4の外周
に保持され、カム溝8a、逃げ孔8bが形成されてい
る。前側にフィルタ取付ねじ8c及び付属品取付部8d
が備えられている。フォーカス連動環9はカム筒4の内
径に回動可能に嵌合し、直進溝9a、貫通溝9bが形成
されている。ズーム操作環10は固定筒1の外周に保持
され、直進溝10aが形成されている。フォーカス操作
環11は固定筒1の外周に保持され、連動部11aが後
方に延びている。連動部11aには直進溝11bが形成
され、先端部11cが設けられている。
The fixed barrel 1 has a camera body (not shown) at the rear.
Equipped with bayonet mount 2 for coupling with, escape groove 1a,
An escape hole 1b, a rectilinear groove 1c, and a hole 1d are formed. Further, an encoder pattern 3 for focusing is provided. The cam cylinder 4 is rotatably fitted into the inner diameter of the fixed cylinder 1 and is provided with a straight groove 4
a, cam groove 4b, cam groove 4c, cam groove 4d, escape hole 4
e, an escape hole 4f is formed. The fourth holding frame 5 is the fourth
The lens group L4 is held and held on the inner circumference of the cam barrel 4, and escape holes 5a and escape holes 5b are formed. Third holding frame 6
Is a plastic molding member that holds the third lens unit L3 and is held on the inner circumference of the fourth holding frame 5. An escape hole 6 a is formed in the third holding frame 6. Also, the step portion 6b is provided on the inner diameter side.
Is provided, and an escape hole 6d penetrating in a direction parallel to the optical axis is provided at a position separated from the step 6c of the stepped portion 6b. The second holding frame 7 holds the second lens group L2 and is held on the inner circumference of the third holding frame 6. The first holding frame 8 holds the first lens group L1, is held on the outer periphery of the third holding frame 6 and the cam barrel 4, and has a cam groove 8a and an escape hole 8b. Filter mounting screw 8c and accessory mounting portion 8d on the front side
Is provided. The focus interlocking ring 9 is rotatably fitted in the inner diameter of the cam barrel 4, and has a rectilinear groove 9a and a through groove 9b. The zoom operation ring 10 is held on the outer periphery of the fixed barrel 1 and has a straight groove 10a. The focus operation ring 11 is held on the outer periphery of the fixed barrel 1, and the interlocking portion 11a extends rearward. A linear groove 11b is formed in the interlocking portion 11a, and a tip portion 11c is provided.

【0009】ピン12はカム筒4に植設され、逃げ溝1
aを貫通し、直進溝10aに係合している。ピン13は
第4保持枠5に植設され、カム溝4dに係合している。
ピン14は第3保持枠6に植設され、カム溝8aに係合
している。ピン15は第3保持枠6に植設され、逃げ孔
5bを貫通し、カム溝4c、直進溝1cに係合してい
る。ピン16は第2保持枠7に植設され、逃げ孔6a、
逃げ孔5a、逃げ孔1bを貫通し、カム溝4b、直進溝
9aに係合している。ピン17は第1保持枠8に植設さ
れ、直進溝4aに係合している。ピン18は直進溝11
bに係合し、逃げ孔4f、逃げ孔8b、逃げ孔4eを貫
通している。
The pin 12 is planted in the cam cylinder 4 and the escape groove 1
It penetrates through a and engages with the straight groove 10a. The pin 13 is planted in the fourth holding frame 5 and engaged with the cam groove 4d.
The pin 14 is planted in the third holding frame 6 and engaged with the cam groove 8a. The pin 15 is planted in the third holding frame 6, penetrates the escape hole 5b, and engages with the cam groove 4c and the rectilinear groove 1c. The pin 16 is planted in the second holding frame 7, and the escape hole 6a,
It penetrates through the escape hole 5a and the escape hole 1b, and engages with the cam groove 4b and the rectilinear groove 9a. The pin 17 is planted in the first holding frame 8 and is engaged with the rectilinear groove 4a. Pin 18 is straight groove 11
It engages with b and penetrates the escape hole 4f, the escape hole 8b, and the escape hole 4e.

【0010】ギア部材19は固定筒1の内周に設けられ
た孔1dに保持され、カプラー(不図示)、小ギア(不
図示)と係合し、又連動部11aの先端部11cと係合
している。内周部にブラシ部材20が設けられ、エンコ
ーダパターン3上を摺動して合焦用の第2レンズ群L2
の位置検出が可能となっている。ばね部材22は第2保
持枠7と第3保持枠6との間に設けられた、がたつき防
止用の部材であり、ばね部材22は保持枠23により保
持されている。
The gear member 19 is held in a hole 1d provided in the inner circumference of the fixed barrel 1, engages with a coupler (not shown) and a small gear (not shown), and engages with the tip portion 11c of the interlocking portion 11a. I am fit. The brush member 20 is provided on the inner peripheral portion and slides on the encoder pattern 3 to focus the second lens group L2.
The position can be detected. The spring member 22 is a member for preventing rattling provided between the second holding frame 7 and the third holding frame 6, and the spring member 22 is held by the holding frame 23.

【0011】絞り駆動板24、絞り環25、絞り連動板
26は絞り機構を構成し、絞り連動板26はカメラボデ
ィ側の連動板(不図示)と連結可能となっている。絞り
連動板26は逃げ孔6dを貫通している。
The diaphragm drive plate 24, the diaphragm ring 25, and the diaphragm interlocking plate 26 constitute an aperture mechanism, and the diaphragm interlocking plate 26 can be connected to an interlocking plate (not shown) on the camera body side. The diaphragm interlocking plate 26 penetrates the escape hole 6d.

【0012】次に変倍動作について説明する。ズーム操
作環10を回転すると、直進溝10aに沿いピン12を
介してカム筒4が回転する。カム筒4が回転すると、カ
ム溝4d及びピン13を介して第4保持枠5が、カム溝
4cに沿いピン14及び逃げ孔5bを介して第3保持枠
6が、又カム溝4bに沿いピン16を介して第2保持枠
7がそれぞれ光軸方向に直進移動する。このとき、ばね
部材22により第2保持枠7と第3保持枠6との間のが
たつきは防止され、両者は円滑に移動する。一方、直進
溝4aに沿いピン17を介して第1保持枠8が回転し、
カム溝8a及びピン14を介して第1保持枠8は回転し
ながら光軸方向に直進移動する。第1保持枠8の固定筒
1に対する移動量は、カム溝8aによる移動量とカム溝
4cによる第3保持枠6の移動量との合成量である。こ
のようにして、全4レンズ群が所定の位置に移動し、変
倍が行われる。
Next, the scaling operation will be described. When the zoom operation ring 10 is rotated, the cam barrel 4 is rotated along the rectilinear groove 10a via the pin 12. When the cam barrel 4 rotates, the fourth holding frame 5 moves along the cam groove 4d and the pin 13, along the cam groove 4c, the third holding frame 6 moves through the pin 14 and the escape hole 5b, and along the cam groove 4b. The second holding frames 7 move linearly in the optical axis direction via the pins 16. At this time, the spring member 22 prevents rattling between the second holding frame 7 and the third holding frame 6, and both of them move smoothly. On the other hand, the first holding frame 8 rotates along the straight groove 4a via the pin 17,
The first holding frame 8 moves linearly in the optical axis direction while rotating via the cam groove 8a and the pin 14. The amount of movement of the first holding frame 8 with respect to the fixed cylinder 1 is a combined amount of the amount of movement of the cam groove 8a and the amount of movement of the third holding frame 6 by the cam groove 4c. In this way, all four lens groups are moved to predetermined positions, and zooming is performed.

【0013】次に合焦動作について説明する。オートフ
ォーカシングのときは、合焦のための駆動力がカメラボ
ディ側からレンズ鏡筒側のカプラー(不図示)、小ギア
(不図示)を介してギア部材19に伝達される。ギア部
材19が回転すると、ギア部材19に先端部11cが係
合している連動部11aが円周方向に移動し、直進溝1
1bに係合するピン18を押圧する。ピン18は、逃げ
孔4f、逃げ孔4e、逃げ孔8bを貫通して、フォーカ
ス連動環9に植設されているから、フォーカス連動環9
が回転する。直進溝9aに係合しているピン16と一体
に第2保持枠7は回転しながら、カム溝4bに沿って光
軸方向に移動し、所定の位置に至り合焦が行われる。こ
の際、ブラシ部材20とエンコーダパターン3により第
2レンズ群L2の位置が検出される。
Next, the focusing operation will be described. During auto focusing, the driving force for focusing is transmitted from the camera body side to the gear member 19 via a coupler (not shown) on the lens barrel side and a small gear (not shown). When the gear member 19 rotates, the interlocking portion 11a with which the tip portion 11c is engaged with the gear member 19 moves in the circumferential direction, and the rectilinear groove 1
The pin 18 engaging with 1b is pressed. The pin 18 penetrates through the escape hole 4f, the escape hole 4e, and the escape hole 8b and is planted in the focus interlocking ring 9.
Rotates. The second holding frame 7 moves in the optical axis direction along the cam groove 4b while rotating integrally with the pin 16 engaged with the straight groove 9a, and reaches a predetermined position for focusing. At this time, the position of the second lens unit L2 is detected by the brush member 20 and the encoder pattern 3.

【0014】マニュアルフォーカシングのときは、フォ
ーカス操作環11を回転すると、連動部11aが円周方
向に移動し、直進溝11bに係合するピン18を押圧す
る。以後の動作は、オートフォーカシングのときと同様
であるから説明を省略する。
During manual focusing, when the focus operation ring 11 is rotated, the interlocking portion 11a moves in the circumferential direction and presses the pin 18 that engages with the rectilinear groove 11b. Subsequent operations are the same as those in the case of autofocusing, and therefore description thereof will be omitted.

【0015】次に第3保持枠について詳述する。図2は
図1のA−A矢視断面図で第3保持枠のみを示す断面図
であり、点線で内径の包絡面を示している。図3は第2
保持枠と第3保持枠との一部展開図である。第3保持枠
6には段部6bが設けられ、又段部6bの段差6cを隔
てた位置に、逃げ孔6dが設けられている。内径は稜除
した正八角柱の形状をなし、面が突起部28、稜に当た
る部分が陥没部29を形成している。8個所の突起部2
8は円筒面の包絡面27を形成して、この面で図1に示
すように第2保持枠7と嵌合している。逃げ孔6dは突
起部28と光軸Oの方向に重複する角度位置に配置され
ている。
Next, the third holding frame will be described in detail. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1 and showing only the third holding frame, and the dotted line shows the envelope surface of the inner diameter. FIG. 3 shows the second
It is a partially expanded view of a holding frame and a third holding frame. The third holding frame 6 is provided with a step portion 6b, and an escape hole 6d is provided at a position separated from the step 6c of the step portion 6b. The inner diameter is in the shape of a regular octagonal prism with the ridge removed, and the surface forms the protrusion 28 and the portion corresponding to the ridge forms the depression 29. 8 protrusions 2
Reference numeral 8 forms an envelope surface 27 having a cylindrical surface, and this surface is engaged with the second holding frame 7 as shown in FIG. The escape hole 6d is arranged at an angular position that overlaps the protrusion 28 in the direction of the optical axis O.

【0016】光は入射すると、第1レンズ群L1及び第
2レンズ群L2を透過し、第2保持枠7と第3保持枠6
との間に到達する。入射光の一部は陥没部29が隙間と
なっているから、第2保持枠7と第3保持枠6の間を通
過して、段部6bに到達するが、段部6bにより直進が
妨げられ、直進する光は逃げ孔6dの入口に到達できな
い。陥没部29での反射による迷光は、段部6bに斜め
に入射する場合があるが、逃げ孔6dは陥没部29と光
軸Oの方向にずれた角度位置に配置されているから、逃
げ孔6dに進入することができない。又この迷光は、段
差6cが充分な大きさで設けられているから、逃げ孔6
dに進入することができない。
When light enters, it passes through the first lens group L1 and the second lens group L2, and the second holding frame 7 and the third holding frame 6
To reach between. A part of the incident light passes through between the second holding frame 7 and the third holding frame 6 and reaches the stepped portion 6b because the depressed portion 29 forms a gap, but the stepped portion 6b prevents the straight traveling. Therefore, the light that travels straight cannot reach the entrance of the escape hole 6d. The stray light reflected by the recess 29 may enter the step 6b at an angle, but the escape hole 6d is arranged at an angular position deviated from the recess 29 in the optical axis O direction. You cannot enter 6d. Further, this stray light is provided with the step 6c having a sufficient size.
You cannot enter d.

【0017】本実施の形態においては突起部は多数の線
であったが、多数の部分的な面、多数の点、又はこれら
の組合せであってもよい。又、突起部を有する面を持つ
円筒部材の内径を使用したが、2本の円筒部材の組合せ
の内外関係は何れであってもよい。又、逃げ孔は絞り連
動板を通すためのものに限られず、例えば実装部品用の
ものであってもよい。
In the present embodiment, the protrusion is a large number of lines, but it may be a large number of partial surfaces, a large number of points, or a combination thereof. Further, although the inner diameter of the cylindrical member having the surface having the protrusion is used, the combination of the two cylindrical members may have any internal / external relationship. Further, the escape hole is not limited to the one through which the diaphragm interlocking plate is passed, and may be for a mounting component, for example.

【0018】[0018]

【発明の効果】本発明により、円筒部材の表面に形成さ
れる隙間による漏光が発生しないレンズ鏡筒が提供でき
る。
According to the present invention, it is possible to provide a lens barrel in which light leakage does not occur due to a gap formed on the surface of a cylindrical member.

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

【図1】実施の形態の光軸を含む面による断面図。FIG. 1 is a sectional view taken along a plane including an optical axis according to an embodiment.

【図2】実施の形態の第3保持枠のみを示す図1のA−
A矢視断面図であり、点線で内径の包絡面を示す。
2 is an A- of FIG. 1 showing only the third holding frame of the embodiment.
It is a sectional view taken along the arrow A, and shows the envelope surface of the inner diameter by a dotted line.

【図3】実施の形態の第2保持枠と第3保持枠との一部
展開図である。
FIG. 3 is a partial development view of a second holding frame and a third holding frame of the embodiment.

【符号の説明】[Explanation of symbols]

1・・・・固定筒 4・・・・カム筒 5・・・・第4保持枠 6・・・・第3保持枠 6b・・・・段部 6c・・・・段差 6d・・・・逃げ孔 7・・・・第2保持枠 8・・・・第1保持枠 27・・・・包絡面 28・・・・突起部 29・・・・陥没部 1 ... Fixed tube 4 ... Cam tube 5 ... 4th holding frame 6 ... 3rd holding frame 6b ... Step 6c ... Step 6d ... Escape hole 7 ... 2nd holding frame 8 ... 1st holding frame 27 ... Envelope surface 28 ... Protrusion 29 ... Depression

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 光軸を中心軸とする円筒面を有する第1
の部材と、突起部を有し、前記突起部の包絡面が円筒面
を形成する第2の部材とを具備し、前記第1の部材と前
記第2の部材が、前記円筒面と前記包絡面とで相互に嵌
合するレンズ鏡筒において、前記第2の部材は、前記包
絡面より突出して形成された段部を有し、前記段部は、
前記突起部に対し前記光軸方向の重複する角度位置に開
口する貫通孔を具備することを特徴とするレンズ鏡筒。
1. A first having a cylindrical surface having an optical axis as a central axis.
And a second member having a protrusion and an envelope surface of the protrusion forming a cylindrical surface, wherein the first member and the second member include the cylindrical surface and the envelope. In the lens barrel that is fitted to each other at the surface, the second member has a step portion formed so as to project from the envelope surface, and the step portion is
A lens barrel comprising: a through hole that opens at an overlapping angular position in the optical axis direction with respect to the protrusion.
【請求項2】 光軸を中心軸とする円筒面を有する第1
の部材と、突起部を有し、前記突起部の包絡面が円筒面
を形成する第2の部材とを具備し、前記第1の部材と前
記第2の部材が、前記円筒面と前記包絡面で相互に嵌合
するレンズ鏡筒において、前記第2の部材は、前記包絡
面より突出して形成された段部を有し、前記段部は、前
記包絡面より段差を設けた位置に開口する貫通孔を具備
することを特徴とするレンズ鏡筒。
2. A first having a cylindrical surface having an optical axis as a central axis
And a second member having a protrusion and an envelope surface of the protrusion forming a cylindrical surface, wherein the first member and the second member include the cylindrical surface and the envelope. In a lens barrel that is fitted to each other in a surface, the second member has a step portion formed so as to project from the envelope surface, and the step portion is opened at a position provided with a step from the envelope surface. A lens barrel comprising: a through hole.
JP7345021A 1995-12-08 1995-12-08 Lens barrel Pending JPH09159902A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7345021A JPH09159902A (en) 1995-12-08 1995-12-08 Lens barrel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7345021A JPH09159902A (en) 1995-12-08 1995-12-08 Lens barrel

Publications (1)

Publication Number Publication Date
JPH09159902A true JPH09159902A (en) 1997-06-20

Family

ID=18373756

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7345021A Pending JPH09159902A (en) 1995-12-08 1995-12-08 Lens barrel

Country Status (1)

Country Link
JP (1) JPH09159902A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019053336A (en) * 2019-01-11 2019-04-04 キヤノン電子株式会社 Rotary member and holding member for light volume adjustment device, light volume adjustment device, and optical device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019053336A (en) * 2019-01-11 2019-04-04 キヤノン電子株式会社 Rotary member and holding member for light volume adjustment device, light volume adjustment device, and optical device

Similar Documents

Publication Publication Date Title
JP3238610B2 (en) Lens support structure
US6747807B2 (en) Lens barrel
JP3379721B2 (en) Lens barrel
US5446593A (en) Lens advancing mechanism
JP2001209102A (en) Shielding device and camera with it
CN110095927B (en) Projection lens and projector
JPH09159902A (en) Lens barrel
JPH09203842A (en) Lens barrel
JP2643284B2 (en) Cam device for lens movement
JP2009036874A (en) Cam cylinder, lens barrel, and optical equipment
JPH01306808A (en) Lens barrel
JPH08211277A (en) Zoom lens barrel and method for adjusting flange back of zoom lens barrel
JPS6120842B2 (en)
US6785059B2 (en) Lens barrel
JPS6032654Y2 (en) Internal reflection prevention device for zoom interchangeable lenses for cameras
JP5349855B2 (en) Lens barrel
JP3793438B2 (en) Lens movement mechanism for zoom lens system switching group
JP3733048B2 (en) Lens group for switching group of zoom lens system having switching group
JP2000066079A (en) Lens barrel
JP3629230B2 (en) Eccentricity prevention device for relative rotation lens holding ring
JP2017120309A (en) Lens barrel and optical device
JP2584878Y2 (en) Zoom lens barrel
JP3733046B2 (en) Lens group for switching group of zoom lens system having switching group
JPS5834407Y2 (en) Distance adjustment device for zoom interchangeable lenses for cameras
JP4641132B2 (en) Lens drive mechanism