JPH0618767A - Lens barrel - Google Patents
Lens barrelInfo
- Publication number
- JPH0618767A JPH0618767A JP3206428A JP20642891A JPH0618767A JP H0618767 A JPH0618767 A JP H0618767A JP 3206428 A JP3206428 A JP 3206428A JP 20642891 A JP20642891 A JP 20642891A JP H0618767 A JPH0618767 A JP H0618767A
- Authority
- JP
- Japan
- Prior art keywords
- optical axis
- diaphragm
- axis direction
- focusing
- lens barrel
- 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
Links
Landscapes
- Lens Barrels (AREA)
- Diaphragms For Cameras (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、レンズ鏡筒に関し、特
に絞り径補正装置を改良したレンズ鏡筒に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens barrel, and more particularly to a lens barrel having an improved diaphragm diameter correcting device.
【０００２】[0002]
【従来の技術】従来のレンズ鏡筒においてズーミングに
よって絞り径が変化する際に行っていた絞り径補正方法
を図３、及び図４により説明する。図３は、従来の鏡筒
の一例を示す縦断面図である。なお、理解を容易にする
ためズーミング機構、フォーカシング機構等本発明の要
旨に直接関係ない部分は省略してある。2. Description of the Related Art A conventional method of correcting a diaphragm diameter when a diaphragm diameter changes due to zooming in a lens barrel will be described with reference to FIGS. FIG. 3 is a vertical sectional view showing an example of a conventional lens barrel. For easy understanding, parts such as a zooming mechanism and a focusing mechanism that are not directly related to the gist of the present invention are omitted.
【０００３】図３において、レンズ群Ｉａ及びＩｂでレ
ンズ群Ｉを構成し、このレンズ群Ｉは合焦時及びズーミ
ング時に光軸方向に移動する。レンズ群IIはレンズ群Ｉ
より後方（カメラボディ側）に位置し、ズーミング時の
み光軸方向に移動する。レンズ群Ｉａは羽根室環５に、
レンズ群Ｉｂは保持環３に、レンズ群IIは保持環４にそ
れぞれ固着、保持されている。In FIG. 3, a lens group Ia and Ib constitute a lens group I, and this lens group I moves in the optical axis direction during focusing and zooming. Lens group II is lens group I
It is located further back (on the camera body side) and moves along the optical axis only during zooming. The lens group Ia is in the vane chamber ring 5,
The lens group Ib is fixed and held to the holding ring 3, and the lens group II is fixed and held to the holding ring 4.
【０００４】保持環３はズーミング時及び合焦時に光軸
方向に移動し、その内周面には羽根室環５が一体に保持
されている。この羽根室環５には、絞り羽根６、光軸回
りに回動可能な絞り板７、及び押え板１２が設けられ絞
り装置を構成している。この絞り装置は公知のものであ
り説明は省略するが、絞り板７を光軸回りに回転させる
ことにより絞り羽根６を回転させて絞り径を変化させる
構造となっている。絞り板７には光軸と平行に折り曲げ
部７ａ、及び係合部７ｂが設けられている。The holding ring 3 moves in the optical axis direction during zooming and focusing, and the blade chamber ring 5 is integrally held on its inner peripheral surface. The blade chamber ring 5 is provided with diaphragm blades 6, a diaphragm plate 7 rotatable around the optical axis, and a holding plate 12 to form a diaphragm device. Although this diaphragm device is publicly known and its description is omitted, the diaphragm blade 7 is rotated by rotating the diaphragm plate 7 around the optical axis to change the diaphragm diameter. The diaphragm plate 7 is provided with a bent portion 7a and an engaging portion 7b parallel to the optical axis.
【０００５】保持環４は、保持環３の内周面に光軸方向
の移動が可能なように嵌合している。なお、保持環３と
保持環４は独立に作動する。The holding ring 4 is fitted on the inner peripheral surface of the holding ring 3 so as to be movable in the optical axis direction. The holding ring 3 and the holding ring 4 operate independently.
【０００６】固定鏡筒１は、その後端部に不図示のカメ
ラボディとの結合のためのマウント２が一体に設けられ
ている。固定鏡筒１の内周側には光軸回りに回動可能な
絞り連動部材９が配置されている。この絞り連動部材９
の一端部には折り曲げ部９ａ形成されており、この折り
曲げ部９ａと絞り板７の係合部７ｂとが係合している。
図４に折り曲げ部９ａと係合部７ａとの係合状態を示す
が、係合部７ｂには先端ほど断面積が減少するような勾
配面７ｃが形成されている。なお、図４中の矢印は光軸
方向を示す。絞り連動部材９の他端部には、不図示のカ
メラボディ側絞り連動部材と係合するための曲げ板８が
一体に設けられている。The fixed lens barrel 1 is integrally provided at its rear end with a mount 2 for coupling with a camera body (not shown). A diaphragm interlocking member 9 rotatable around the optical axis is arranged on the inner peripheral side of the fixed barrel 1. This diaphragm interlocking member 9
A bent portion 9a is formed at one end of the bent portion 9a, and the bent portion 9a and the engaging portion 7b of the diaphragm plate 7 are engaged with each other.
FIG. 4 shows the engaged state between the bent portion 9a and the engaging portion 7a. The engaging portion 7b is formed with a sloped surface 7c whose cross-sectional area decreases toward the tip. The arrow in FIG. 4 indicates the optical axis direction. A bending plate 8 for engaging with a camera body side diaphragm interlocking member (not shown) is integrally provided at the other end of the diaphragm interlocking member 9.
【０００７】図４において、図中実線はワイド状態にお
ける係合状態を示している。この状態からズーミングを
行いテレ側に移行する。すなわち、保持環３が光軸方向
前方（図３中左方向）に移動すると絞り板７はこれに追
従し、絞り板７の係合部７ｂは図４の２点鎖線で示す位
置に移動する。この移動にともない、絞り板７は光軸回
りにθで示す量だけ回転する。したがって、絞り羽根６
が回転し、絞り径補正が行われる。In FIG. 4, the solid line in the drawing shows the engaged state in the wide state. From this state, zooming is performed and the camera moves to the tele side. That is, when the holding ring 3 moves forward in the optical axis direction (leftward in FIG. 3), the diaphragm plate 7 follows this, and the engaging portion 7b of the diaphragm plate 7 moves to the position shown by the chain double-dashed line in FIG. . Along with this movement, the diaphragm plate 7 rotates about the optical axis by an amount indicated by θ. Therefore, the diaphragm blade 6
Rotates, and the aperture diameter is corrected.
【０００８】[0008]
【発明が解決しようとする課題】近年、自動合焦方式に
対応するために、レンズ鏡筒においてはその駆動負荷を
軽くするため内焦方式を採用することが多くなってい
る。この内焦方式を採用した場合には、ズーミングによ
って絞り径が変化するときに、前述の方法と同様な方法
で絞り径を補正するのみでは不十分である。すなわち、
内焦方式の場合には、保持環３が合焦時にも光軸方向に
移動するので、同時に絞り板７も移動、回転し、本来、
絞り径補正の必要ない合焦時にも絞り径が変化してしま
うという問題があった。In recent years, in order to cope with the automatic focusing method, the internal focusing method is often adopted in the lens barrel to reduce the driving load thereof. When this internal focusing method is adopted, when the aperture diameter changes due to zooming, it is not sufficient to simply correct the aperture diameter by the same method as that described above. That is,
In the case of the internal focusing method, since the holding ring 3 moves in the optical axis direction even during focusing, the diaphragm plate 7 also moves and rotates at the same time, and originally,
There is a problem that the aperture diameter changes even at the time of focusing without the need for aperture diameter correction.
【０００９】そこで本発明は、ズーミング時は従来通り
絞り径補正を行うが、合焦時には絞り径を変化させるこ
とのない内焦方式を採用したレンズ鏡筒を提供すること
を目的とする。Therefore, it is an object of the present invention to provide a lens barrel which employs an internal focusing method in which the aperture diameter is corrected in the conventional manner during zooming, but the aperture diameter is not changed during focusing.
【００１０】[0010]
【課題を解決するための手段】上記課題を解決のため
に、本発明によるレンズ鏡筒は、ズーミング時及び合焦
時には光軸方向に移動しない絞り連動部材（９）と、前
記絞り連動部材と係合し、ズーミング時には光軸方向に
移動し合焦時には光軸方向に移動しない光軸回りに回動
可能な中継部材（１０）と、前記中継部材と係合し、ズ
ーミング時及び合焦時に光軸方向に移動する光軸回りに
回動可能な絞り部材（７）とを設け、前記中継部材の前
記絞り連動部材との係合面を勾配面とした構成としてあ
る。In order to solve the above problems, the lens barrel according to the present invention comprises an aperture interlocking member (9) that does not move in the optical axis direction during zooming and focusing, and the aperture interlocking member. A relay member (10) that is engaged and moves in the optical axis direction during zooming, and is rotatable around the optical axis that does not move in the optical axis direction during focusing, and engages with the relay member, and during zooming and focusing. A diaphragm member (7) rotatable about an optical axis that moves in the optical axis direction is provided, and an engaging surface of the relay member with the diaphragm interlocking member is a sloped surface.
【００１１】この場合に、前記絞り連動部材（９）が固
定鏡筒に、前記中継部材（１０）がズーミング時には光
軸方向に移動し合焦時には光軸方向に移動しないレンズ
保持環に、前記絞り部材（７）がズーミング時及び合焦
時に光軸方向に移動するレンズ保持環にそれぞれ設けら
れる。In this case, the diaphragm interlocking member (9) is a fixed lens barrel, and the relay member (10) is a lens holding ring which moves in the optical axis direction during zooming but does not move in the optical axis direction during focusing. A diaphragm member (7) is provided on each lens holding ring that moves in the optical axis direction during zooming and focusing.
【００１２】[0012]
【作用】本発明では、ズーミング時においては、中継部
材は光軸方向に移動するとともに絞り連動部材との係合
面が勾配面となっているので、光軸回りにも回転する。
中継部材が回転するため、これと係合する絞り部材も同
様に回転して絞り径を補正する。しかし、合焦時には中
継部材は光軸方向に移動しないため光軸回りに回転する
こともない。したがって、絞り部材も回転せず絞り径は
変化しない。In the present invention, during zooming, the relay member moves in the optical axis direction, and since the engaging surface with the diaphragm interlocking member is a sloped surface, it also rotates about the optical axis.
Since the relay member rotates, the diaphragm member engaging with the relay member also rotates to correct the diaphragm diameter. However, since the relay member does not move in the optical axis direction during focusing, it does not rotate around the optical axis. Therefore, the diaphragm member also does not rotate and the diaphragm diameter does not change.
【００１３】[0013]
【実施例】以下、本発明を実施例に基づき説明する。図
１は本発明によるレンズ鏡筒の一実施例を示す縦断面図
である。なお、図３と同様に理解を容易にするためズー
ミング機構、フォーカシング機構等本発明の要旨に直接
関係ない部分は省略してある。また図３と同一部分に
は、同一符号を付してしてある。EXAMPLES The present invention will be described below based on examples. FIG. 1 is a vertical sectional view showing an embodiment of a lens barrel according to the present invention. As in FIG. 3, parts such as a zooming mechanism and a focusing mechanism that are not directly related to the gist of the present invention are omitted for easy understanding. The same parts as those in FIG. 3 are designated by the same reference numerals.
【００１４】保持環４には、その内周に中継部材１０が
保持され、中継部材１０は光軸回りに回動可能である。
中継部材１０には、切り欠き部１０ｂが設けられ、この
切り欠き部１０ｂは、絞り板７の折り曲げ部７ａと係合
している。なお、折り曲げ部７ａは真直であり断面積は
一定である。A relay member 10 is held on the inner circumference of the holding ring 4, and the relay member 10 is rotatable around the optical axis.
The relay member 10 is provided with a cutout portion 10b, and the cutout portion 10b is engaged with the bent portion 7a of the diaphragm plate 7. The bent portion 7a is straight and has a constant cross-sectional area.
【００１５】また、絞り連動部材９の一端部には折り曲
げ部９ａが形成されており、この折り曲げ部９ａと中継
部材１０の折り曲げ部１０ａが係合している。折り曲げ
部９ａと中継部材１０の折り曲げ部１０ａとの係合部を
図２に示すが、中継部材１０の折り曲げ部１０ａは、先
端ほど断面積が減少するごとく勾配面１０ｃが形成され
ている。絞り連動部材９の他端部には、不図示のカメラ
ボディ側絞り連動部材と係合するための曲げ板８が一体
に設けられている。A bent portion 9a is formed at one end of the diaphragm interlocking member 9, and the bent portion 9a and the bent portion 10a of the relay member 10 are engaged with each other. The engaging portion between the bent portion 9a and the bent portion 10a of the relay member 10 is shown in FIG. 2. The bent portion 10a of the relay member 10 is formed with a sloped surface 10c as the cross-sectional area decreases toward the tip. A bending plate 8 for engaging with a camera body side diaphragm interlocking member (not shown) is integrally provided at the other end of the diaphragm interlocking member 9.
【００１６】以上の構成を有するレンズ鏡筒における絞
り径の補正方法を説明する。絞り径の制御は、不図示の
ボディ側連動部材と曲げ板８の係合、絞り連動部材９の
折り曲げ部９ａと中継部材１０の折り曲げ部１０ａとの
係合、及び中継部材１０の切り欠き部１０ｂと絞り板７
の折り曲げ部７ａとの係合を介し、カメラボディ側より
絞り装置に伝達されることにより行われる。A method of correcting the aperture diameter in the lens barrel having the above structure will be described. The aperture diameter is controlled by engaging the body-side interlocking member (not shown) with the bending plate 8, engaging the bent portion 9a of the aperture interlocking member 9 with the bent portion 10a of the relay member 10, and the cutout portion of the relay member 10. 10b and diaphragm plate 7
It is performed by being transmitted to the diaphragm device from the camera body side through the engagement with the bent portion 7a.
【００１７】ズーミング時には、保持環３及び保持環４
の双方ともに光軸方向に移動する。この際の絞り径の補
正方法を図２を用いて説明する。図２は前述のように絞
り連動部材９の折り曲げ部９ａと中継部材１０の折り曲
げ部１０ａとの係合部を示し、実線はワイド状態におけ
る係合状態を示している。At the time of zooming, the retaining ring 3 and the retaining ring 4
Both of them move in the optical axis direction. A method of correcting the aperture diameter in this case will be described with reference to FIG. FIG. 2 shows the engaging portion between the bent portion 9a of the diaphragm interlocking member 9 and the bent portion 10a of the relay member 10 as described above, and the solid line shows the engaged state in the wide state.
【００１８】この状態からテレ側に移行する、すなわち
保持環４が光軸方向前方( 図１中左方向) に移動する
と、中継部材１０はこれに追従し、中継部材１０の折り
曲げ部１０ａは図２の２点鎖線で示す位置に移動する。
この移動にともない、中継部材１０は光軸回りにθで示
す量だけ回転する。この回転は、中継部材１０の切り欠
き部１０ｂと絞り板７の折り曲げ部７ａとの係合を介し
て絞り板７に伝達され、絞り板７は光軸回りに回転す
る。この回転に伴い絞り径が補正される。When the state moves from this state to the tele side, that is, when the holding ring 4 moves forward in the optical axis direction (to the left in FIG. 1), the relay member 10 follows this, and the bent portion 10a of the relay member 10 becomes Move to the position indicated by the two-dot chain line in 2.
With this movement, the relay member 10 rotates about the optical axis by an amount indicated by θ. This rotation is transmitted to the diaphragm plate 7 through engagement between the cutout portion 10b of the relay member 10 and the bent portion 7a of the diaphragm plate 7, and the diaphragm plate 7 rotates about the optical axis. With this rotation, the aperture diameter is corrected.
【００１９】合焦時には、保持環３は光軸方向に移動す
るが、保持環４は光軸方向に移動せず、絞り連動部材９
の折り曲げ部９ａと中継部材１０の折り曲げ部１０ａと
の係合状態に変化は生じない。従って、中継部材１０は
光軸回りに回転することがなく、このため絞り板７も光
軸回りに回転せず、絞り径も変化しない。At the time of focusing, the holding ring 3 moves in the optical axis direction, but the holding ring 4 does not move in the optical axis direction, and the diaphragm interlocking member 9
There is no change in the engagement state between the bent portion 9a and the bent portion 10a of the relay member 10. Therefore, the relay member 10 does not rotate around the optical axis, so that the diaphragm plate 7 also does not rotate around the optical axis and the diaphragm diameter does not change.
【００２０】[0020]
【発明の効果】以上詳しく説明したように本発明によれ
ば、ズーミング時には絞り径が補正されるが合焦時には
絞り径が保持され変化しない、という利点がある。As described above in detail, according to the present invention, there is an advantage that the aperture diameter is corrected during zooming, but the aperture diameter is held and does not change during focusing.
【図１】本発明によるレンズ鏡筒の一実施例の要部断面
図である。FIG. 1 is a sectional view of an essential part of an embodiment of a lens barrel according to the present invention.
【図２】本発明によるレンズ鏡筒の一実施例の絞り連動
部材と中継部材との係合状態を示す図である。FIG. 2 is a view showing an engaged state of a diaphragm interlocking member and a relay member of an embodiment of a lens barrel according to the present invention.
【図３】従来のレンズ鏡筒の要部断面図である。FIG. 3 is a sectional view of a main part of a conventional lens barrel.
【図４】従来のレンズ鏡筒の絞り連動部材と絞り部材と
の係合状態を示す図である。FIG. 4 is a diagram showing an engagement state between a diaphragm interlocking member and a diaphragm member of a conventional lens barrel.
７ 絞り板 ９ 絞り連動部材 １０ 中継部材 7 Drawing plate 9 Drawing interlocking member 10 Relay member
Claims (2)
移動しない絞り連動部材と、 前記絞り連動部材と係合し、ズーミング時には光軸方向
に移動し合焦時には光軸方向に移動しない光軸回りに回
動可能な中継部材と、 前記中継部材と係合し、ズーミング時及び合焦時に光軸
方向に移動する光軸回りに回動可能な絞り部材とを設
け、 前記中継部材の前記絞り連動部材との係合面を勾配面と
したことを特徴とするレンズ鏡筒。1. An aperture interlocking member that does not move in the optical axis direction during zooming and focusing, and an optical axis that engages with the aperture interlocking member, moves in the optical axis direction during zooming, and does not move in the optical axis direction during focusing. A relay member rotatable about the optical axis, and a diaphragm member engaged with the relay member and rotatable around an optical axis that moves in the optical axis direction during zooming and focusing are provided, the diaphragm of the relay member A lens barrel having an inclined surface as an engagement surface with an interlocking member.
時には光軸方向に移動しないレンズ保持環に、 前記絞り部材がズーミング時及び合焦時に光軸方向に移
動するレンズ保持環にそれぞれ設けられることを特徴と
する請求項１記載のレンズ鏡筒。2. The diaphragm interlocking member is a fixed lens barrel, the relay member is a lens holding ring that moves in the optical axis direction during zooming and does not move in the optical axis direction during focusing, and the diaphragm member during zooming and focusing. The lens barrel according to claim 1, wherein the lens barrel is provided on each of the lens holding rings that sometimes move in the optical axis direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20642891A JP2936184B2 (en) | 1991-07-23 | 1991-07-23 | Lens barrel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20642891A JP2936184B2 (en) | 1991-07-23 | 1991-07-23 | Lens barrel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0618767A true JPH0618767A (en) | 1994-01-28 |
| JP2936184B2 JP2936184B2 (en) | 1999-08-23 |
Family
ID=16523218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20642891A Expired - Fee Related JP2936184B2 (en) | 1991-07-23 | 1991-07-23 | Lens barrel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2936184B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011040101A (en) * | 2010-11-10 | 2011-02-24 | Seiko Epson Corp | Recording medium, display control method, printer control device, and printer |
| JP2011039107A (en) * | 2009-08-06 | 2011-02-24 | Canon Inc | Optical apparatus |
| US10139587B2 (en) | 2015-11-26 | 2018-11-27 | Canon Kabushiki Kaisha | Lens barrel and optical apparatus |
| US10255884B2 (en) | 2011-09-23 | 2019-04-09 | Manufacturing Resources International, Inc. | System and method for environmental adaptation of display characteristics |
-
1991
- 1991-07-23 JP JP20642891A patent/JP2936184B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011039107A (en) * | 2009-08-06 | 2011-02-24 | Canon Inc | Optical apparatus |
| JP2011040101A (en) * | 2010-11-10 | 2011-02-24 | Seiko Epson Corp | Recording medium, display control method, printer control device, and printer |
| US10255884B2 (en) | 2011-09-23 | 2019-04-09 | Manufacturing Resources International, Inc. | System and method for environmental adaptation of display characteristics |
| US10139587B2 (en) | 2015-11-26 | 2018-11-27 | Canon Kabushiki Kaisha | Lens barrel and optical apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2936184B2 (en) | 1999-08-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |