JPH087377Y2 - Lens barrel - Google Patents

Description

【考案の詳細な説明】 〔産業上の利用分野〕 本考案は、カメラのフィルム面への撮影像の向きを横
位置と縦位置とに変換するための像位置変換機構を有す
るレンズ鏡筒の改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a lens barrel having an image position conversion mechanism for converting the orientation of a captured image on the film surface of a camera into a horizontal position and a vertical position. Regarding improvement.

〔従来の技術〕[Conventional technology]

写真撮影時において撮影対象である撮影像やその撮影
状況などによってカメラの向きを変え、フィルム面への
像の写し込み方向を横位置から縦位置、あるいは縦位置
から横位置というように像位置を変換することが一般に
行なわれている。When taking a picture, change the direction of the camera depending on the image to be shot and the shooting conditions, and change the image position on the film surface from horizontal position to vertical position or from vertical position to horizontal position. Converting is commonly done.

ところで、長焦点のレンズ鏡筒を使用して撮影を行な
う場合において従来一般には、レンズ鏡筒の外周部に対
し光軸回りに回転可能な状態で三脚座を付設するととも
に、この三脚座を三脚に固定することで、レンズ鏡筒お
よびカメラ本体を保持するように構成されていた。そし
て、上述したような像位置の変換に関しては、レンズ鏡
筒とカメラ本体とを、三脚座に対し光軸回りで相対的に
回転させ、レンズ鏡筒を三脚座に対して所定位置で固定
するという操作を必要とするものであった。しかし、長
焦点のレンズ鏡筒は外形や口径等が大きくなるに伴なっ
て重量も重くなるために、上述したような三脚座に対し
てレンズ鏡筒を手動で回転操作するに際して多大な労力
を必要とし、迅速な操作を行なうことは困難で、撮影者
にとって大きな負担となるものであった。By the way, in the case of shooting using a long-focus lens barrel, conventionally, a tripod mount is attached to the outer periphery of the lens barrel so as to be rotatable about the optical axis, and the tripod mount is used as a tripod. It was configured to hold the lens barrel and the camera body by fixing the lens barrel and the camera body. Then, regarding the conversion of the image position as described above, the lens barrel and the camera body are relatively rotated around the optical axis with respect to the tripod seat, and the lens barrel is fixed at a predetermined position with respect to the tripod seat. That was the operation that was required. However, since the long-focus lens barrel becomes heavier as the outer shape and aperture increase, a great deal of labor is required when manually rotating the lens barrel with respect to the tripod mount as described above. It is necessary and quick to operate, which is a heavy burden on the photographer.

勿論、このような問題は、長焦点のレンズ鏡筒以外に
も、鏡筒自体が大型でしかも重量が重くなり、撮影者が
手持ち撮影を行ない難いタイプのレンズ鏡筒においても
同様に生じるものであり、何らかの対策が必要とされて
いる。Of course, such a problem occurs not only in the long focus lens barrel but also in the lens barrel of a type in which the lens barrel itself is large and heavy, which makes it difficult for the photographer to perform handheld shooting. Yes, some measure is required.

このため、大型でしかも重量が重いために三脚で支持
することが望ましいレンズ鏡筒において、像位置の横位
置と縦位置との変換を容易に行なえるように、レンズ鏡
筒を、三脚側に固定される三脚座を有する前部鏡筒とこ
の前部鏡筒に対し回動可能な状態で連結されかつ後端側
のマウント部にカメラ本体が装着される後部鏡筒とに分
割して構成し、前部鏡筒に対し後部鏡筒をカメラ本体と
共に相対的に回動させ得るように構成してなるレンズ鏡
筒が、たとえば実開昭56−60912号公報等により従来か
ら提案されていた。For this reason, in a lens barrel that is large and heavy, and therefore it is desirable to support it on a tripod, place the lens barrel on the tripod side so that the horizontal position and the vertical position of the image position can be easily converted. A front lens barrel having a fixed tripod mount and a rear lens barrel that is rotatably connected to the front lens barrel and has a camera body mounted on a mount portion on the rear end side. However, a lens barrel configured such that the rear lens barrel can be rotated relative to the front lens barrel together with the camera body has been conventionally proposed by, for example, Japanese Utility Model Publication No. 56-60912. .

〔考案が解決しようとする課題〕[Problems to be solved by the device]

しかしながら、上述した従来のレンズ鏡筒は、前部鏡
筒内に焦点調節を行なう光学レンズ系を可動調節可能に
保持させるとともに、その焦点調節用操作つまみも、こ
の前部鏡筒側に付設しており、また後部鏡筒側には、レ
ンズ開口の開口量を制御する絞り調整機構を設け、かつ
この絞り調整機構にカメラ本体側の絞り制御手段からの
絞り制御信号の伝達を行なう絞り信号伝達手段を付設し
てなる構成を有しているもので、次のような問題点をも
つものであった。However, in the conventional lens barrel described above, the optical lens system for performing focus adjustment is movably held in the front barrel, and the focus adjustment operation knob is also attached to the front barrel side. The rear lens barrel side is provided with an aperture adjustment mechanism for controlling the aperture amount of the lens aperture, and the aperture signal transmission for transmitting the aperture control signal from the aperture control means on the camera body side. It has a structure in which means is attached, and has the following problems.

すなわち、上述したようなレンズ鏡筒においてレンズ
開口の絞り位置は、カメラ本体に近ければ近い程、後部
鏡筒が短くてよく、前述した横位置と縦位置との像位置
変換は比較的簡単に行なえ、しかも前部鏡筒側に設けら
れる焦点調節つまみを撮影者に近づけて位置させること
ができ、焦点調節等の操作性を向上させることが可能と
なる。しかし、光学設計にあたってレンズ開口の絞り位
置を必要以上にカメラ本体側に近づけると、周辺光量が
少なくなる。非点収差を補正することが難しくなる、倍
率の色収差の曲りは強くなり補正が難しくなる等の不具
合を生じる。That is, in the lens barrel as described above, the closer the aperture position of the lens aperture is to the camera body, the shorter the rear lens barrel may be, and the image position conversion between the horizontal position and the vertical position described above is relatively easy. In addition, the focus adjustment knob provided on the front lens barrel side can be positioned closer to the photographer, and operability such as focus adjustment can be improved. However, in optical design, if the diaphragm position of the lens aperture is brought closer than necessary to the camera body side, the amount of peripheral light decreases. It is difficult to correct astigmatism, and the chromatic aberration of magnification becomes more curved, which causes problems such as difficulty in correction.

そして、これらの点を考慮し、優れた光学性能を得る
ために、設計上でレンズ開口絞り調整機構をカメラ本体
からできるだけ遠い位置に配設しようとした場合、上述
した従来構造では焦点調節つまみを撮影者から遠く離れ
たところに位置させることが必要となり、この焦点調節
つまみが使用頻度の高い操作部材であるだけに長時間に
わたっての撮影時には支障をきたすものであった。In consideration of these points, if the lens aperture stop adjusting mechanism is designed to be arranged at a position as far as possible from the camera body in order to obtain excellent optical performance, in the conventional structure described above, the focus adjusting knob is used. It is necessary to position the lens far away from the photographer, and this focus adjustment knob is an operating member that is frequently used, which causes a problem when photographing for a long time.

このような問題を解決するために、前部鏡筒と後部鏡
筒との連結部を、カメラ本体近傍に位置させたままで、
後部鏡筒のレンズ開口絞り調整機構を組込んだ前端側
を、前部鏡筒内部に延出させて形成し、絞り調整機構を
カメラ本体からできるだけ離して保持させる構成とする
ことが考えられるが、この延出させた部分だけ鏡筒が二
重構造となり重量が増加する結果となるもので、このレ
ンズ鏡胴を持ち運ぶ際やセッティングする際により一層
の多大の労力が必要とされるもので、このような点を考
慮し何らの対策を講じることが望まれている。In order to solve such a problem, with the connecting portion between the front lens barrel and the rear lens barrel being positioned near the camera body,
It is conceivable that the front end side of the rear lens barrel in which the lens aperture diaphragm adjusting mechanism is incorporated is formed to extend inside the front lens barrel, and the diaphragm adjusting mechanism is held as far as possible from the camera body. As a result, the lens barrel has a double structure only in this extended portion, which results in an increase in weight, which requires much more effort when carrying or setting this lens barrel, It is desired to take some measures in consideration of such points.

〔課題を解決するための手段〕[Means for solving the problem]

このような要請に応えるために本考案に係るレンズ鏡
筒は、前部鏡筒内に光学レンズ系を光軸方向に可動調節
する焦点調節機構を設けるとともに、前部鏡筒に対し光
軸回りに回動可能な状態で連結されている後部鏡筒の後
端側に焦点調節操作部材を配設し、かつこれら前部鏡筒
内の焦点調節機構と後部鏡筒側の焦点調節操作部材と
を、光軸回りで相対的に回転変位可能な状態で連結する
ようにしたものである。In order to meet such demands, the lens barrel according to the present invention is provided with a focus adjusting mechanism for movably adjusting the optical lens system in the optical axis direction in the front lens barrel, and at the same time, rotating the optical axis with respect to the front lens barrel. A focus adjustment operation member is provided on the rear end side of the rear lens barrel connected to the rear lens barrel in a rotatable manner, and a focus adjustment mechanism inside the front lens barrel and a focus adjustment operation member on the rear lens barrel side. Are connected so that they can be relatively rotationally displaced about the optical axis.

〔作用〕[Action]

本考案によれば、焦点調節操作部材を、前部鏡筒と後
部鏡筒との連結部よりもカメラ本体側に配設しているこ
とから、前部鏡筒と後部鏡筒の連結部と焦点調節操作部
材との配設関係を独立させて考慮でき、優れた光学性能
が得られる位置にレンズ開口絞り調整機構を配設するこ
とを可能とし、しかもこの配設位置によって焦点調節操
作性を維持するためにレンズ鏡筒での重量増加などを招
くといった問題を一掃し得るものである。According to the present invention, since the focus adjusting operation member is disposed closer to the camera body than the connecting portion between the front lens barrel and the rear lens barrel, the connecting portion between the front lens barrel and the rear lens barrel is provided. The arrangement relationship with the focus adjustment operating member can be considered independently, and it becomes possible to arrange the lens aperture stop adjustment mechanism at a position where excellent optical performance is obtained. This can eliminate the problem of increasing the weight of the lens barrel in order to maintain it.

〔実施例〕〔Example〕

以下、本考案を図面に示した実施例を用いて詳細に説
明する。Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings.

第１図および第２図は本考案に係るレンズ鏡筒の一実
施例を示すものであり、図において、符号１はレンズ鏡
筒、２はこのレンズ鏡筒１の後端側のマウント部に装着
されるカメラ本体である。1 and 2 show an embodiment of a lens barrel according to the present invention. In the drawings, reference numeral 1 is a lens barrel, and 2 is a mount portion on the rear end side of the lens barrel 1. It is the camera body to be mounted.

前記レンズ鏡筒１は、前部鏡筒1aと後部鏡筒1bとから
なり、前部鏡筒1aの外側には三脚取付けねじ穴3aを有す
る三脚座３が設けられ、また内部には、焦点調節用の光
学レンズ系４とそのレンズ駆動機構部（詳細は図示せ
ず）とからなる焦点調節機構５が、光学レンズ系４を光
軸方向に可動調整可能に設けられている。ここで、4aは
レンズ枠である。The lens barrel 1 includes a front lens barrel 1a and a rear lens barrel 1b, a tripod mount 3 having a tripod mounting screw hole 3a is provided outside the front lens barrel 1a, and a focus is provided inside the lens barrel 1. A focus adjusting mechanism 5 including an adjusting optical lens system 4 and a lens driving mechanism section (details thereof are not shown) is provided so that the optical lens system 4 can be moved and adjusted in the optical axis direction. Here, 4a is a lens frame.

一方、前記後部鏡筒1bにおいてその後端側マウント部
にカメラ本体２が装着されるとともに、この後部鏡筒1b
の内部には、レンズ開口量を制御するレンズ開口絞り調
整機構６が前端側に設けられ、かつこの絞り調整機構６
にカメラ本体２側の絞り制御手段（図示せず）からの絞
り制御信号を伝達する絞り信号伝達部材７がこの鏡筒1b
の内壁部近くを光軸方向に沿って配設されている。ま
た、この後部鏡筒1bの前端側外周部には、環状突部1cが
形成され、この環状突部1cが前部鏡筒1aの後端側内周部
に突設された二重の環状突部1d,1eにより形成される環
状溝1f内に嵌込まれて光軸回りに回動可能な状態でしか
も光軸方向への移動を規制されて保持されている。さら
に、これら前部鏡筒1aと後部鏡筒1bとの連結部には、ク
ランプ手段として調整用ビス８が螺合して設けられ、そ
の先端部をねじ込みで後部鏡筒1bの環状突部1cに圧接さ
せて係止することで、これら前部鏡筒1aと後部鏡筒1bと
の相対的な回転変位を所定の位置で結合固定するように
なっている。On the other hand, while the camera body 2 is mounted on the rear end side mount portion of the rear barrel 1b, the rear barrel 1b
A lens aperture diaphragm adjustment mechanism 6 for controlling the lens aperture amount is provided on the front end side inside the lens, and this diaphragm adjustment mechanism 6
An aperture signal transmitting member 7 for transmitting an aperture control signal from an aperture control means (not shown) on the camera body 2 side is attached to the lens barrel 1b.
Is disposed along the optical axis near the inner wall of the. Further, an annular protrusion 1c is formed on the outer peripheral portion on the front end side of the rear lens barrel 1b, and the annular protrusion 1c is a double annular protrusion projecting on the inner peripheral portion on the rear end side of the front lens barrel 1a. It is fitted in an annular groove 1f formed by the protrusions 1d, 1e and is held in a state of being rotatable around the optical axis and restricted in movement in the optical axis direction. Further, an adjusting screw 8 is provided as a clamping means at a connecting portion between the front lens barrel 1a and the rear lens barrel 1b by screwing, and a tip end of the adjusting screw 8 is screwed into the annular protrusion 1c of the rear lens barrel 1b. By pressing and locking the front lens barrel 1a and the rear lens barrel 1a, the relative rotational displacement between the front lens barrel 1a and the rear lens barrel 1b is fixedly coupled at a predetermined position.

10は前記後部鏡筒1bの外周部で後端寄りの部分に回動
操作可能に設けられた焦点調節操作部材としての焦点調
節操作リングで、この操作リング10は、後部鏡筒1bに対
し光軸回りに回転可能でかつ光軸方向には移動できない
ように嵌合して保持されている。そして、この操作リン
グ10の内周面には、螺旋状リード溝10aが形成されると
ともに、これに対応して後部鏡筒1bには光軸方向に向っ
て直進溝1gが形成されている。Reference numeral 10 denotes a focus adjusting operation ring as a focus adjusting operation member rotatably provided in a portion near the rear end on the outer peripheral portion of the rear lens barrel 1b. It is fitted and held so that it can rotate about its axis and cannot move in the direction of the optical axis. A spiral lead groove 10a is formed on the inner peripheral surface of the operation ring 10, and a rectilinear groove 1g is formed correspondingly to the rear lens barrel 1b in the optical axis direction.

また、この操作リング10に対応して後部鏡筒1bの内周
部には、円筒部材11が嵌合して保持され、この円筒部材
11には、前記直進溝1gを貫通して螺旋状リード溝10aに
係合する係合ガイドピン12が外周面に植設して設けられ
ている。そして、このような構成によって、この円筒部
材11は、前記操作リング10の回転操作に伴ない、ガイド
ピン12のリード溝10aと直進溝1gとの係合によって、後
部鏡筒1b内で光軸方向に可動されることになる。さら
に、円筒部材11には、後部鏡筒1bの内壁部に沿って光軸
方向に延びた腕11aが設けられ、この腕11aは、後部鏡筒
1bの前端側に設けられている絞り調整機構６を保持する
保持部に穿設されている貫通孔1hを通り、前記前部鏡筒
1a内に臨むように設けられている。なお、この円筒部材
11の内周部分で前記絞り信号伝達部材７の支持部7aに干
渉する部分には切欠き11bが形成されている。Further, a cylindrical member 11 is fitted and held on the inner peripheral portion of the rear lens barrel 1b corresponding to the operation ring 10.
An engagement guide pin 12 is provided on the outer peripheral surface of the member 11 so as to penetrate the straight groove 1g and engage with the spiral lead groove 10a. With such a configuration, the cylindrical member 11 has an optical axis in the rear barrel 1b due to the engagement of the lead groove 10a of the guide pin 12 and the rectilinear groove 1g with the rotation operation of the operation ring 10. It will be movable in the direction. Further, the cylindrical member 11 is provided with an arm 11a extending in the optical axis direction along the inner wall portion of the rear barrel 1b, and the arm 11a is a rear barrel.
The front lens barrel is passed through a through hole 1h formed in a holding portion for holding the diaphragm adjusting mechanism 6 provided on the front end side of 1b.
It is provided so as to face the inside of 1a. In addition, this cylindrical member
A notch 11b is formed in a portion of the inner peripheral portion of 11 that interferes with the support portion 7a of the diaphragm signal transmission member 7.

一方、前記前部鏡筒1a内で可動可能に支持されている
焦点調節機構５側のレンズ枠4aには、上述した円筒部材
11からの腕11aと対向して光軸方向を後端側に向って延
設される腕4bが設けられている。そして、この腕4bは、
前部鏡筒1aと後部鏡筒1bとの連結部よりも前端側におい
て、前記後部鏡筒1b前端部に突設された円筒部1i内部に
可動可能な状態で嵌合保持されるリング状部材13の配設
部分まで延設され、その先端がこのリング状部材13の内
周部にビス14で固定されている。On the other hand, in the lens frame 4a on the side of the focus adjusting mechanism 5 which is movably supported in the front lens barrel 1a, the above-mentioned cylindrical member is provided.
An arm 4b is provided which faces the arm 11a from 11 and extends in the optical axis direction toward the rear end side. And this arm 4b
A ring-shaped member that is movably fitted and held inside a cylindrical portion 1i projecting from the front end portion of the rear lens barrel 1b on the front end side of the connecting portion between the front lens barrel 1a and the rear lens barrel 1b. The ring-shaped member 13 is fixed to the inner peripheral portion of the ring-shaped member 13 with a screw 14 so as to extend to the portion where the 13 is disposed.

このリング状部材13は、前部鏡筒1a側の焦点調節機構
５と後部鏡筒1b側に設けた円筒部材11とを、光軸回りで
相対的な回動変位を可能な状態で光軸方向への動きを伝
達する伝達手段として機能するところである。すなわ
ち、このリング状部材13は、第２図からも明らかなよう
に、レンズ枠4a側の腕部4bに連結されるとともに、その
後端寄り内周部に環状溝13aが形成され、この環状溝13a
内の一部に前記後部鏡筒1b側から延設されている腕11a
の先端部に設けたガイドピン15が係合し、これにより前
部鏡筒1aと後部鏡筒1bとの光軸回りでの相対的な位置関
係がどのような状態であったとしても、腕11a,4bを介し
て操作リング10側での操作量を光軸方向への動きとして
焦点調節機構５に伝達し得るように構成されている。The ring-shaped member 13 is configured such that the focus adjusting mechanism 5 on the front lens barrel 1a side and the cylindrical member 11 provided on the rear lens barrel 1b side can be rotated relative to each other around the optical axis. It functions as a transmission means for transmitting the movement in the direction. That is, as is apparent from FIG. 2, the ring-shaped member 13 is connected to the arm portion 4b on the lens frame 4a side, and the annular groove 13a is formed in the inner peripheral portion near the rear end. 13a
An arm 11a extending from the rear lens barrel 1b side in a part thereof.
The guide pin 15 provided at the tip end of the arm engages with the arm, regardless of the relative positional relationship between the front lens barrel 1a and the rear lens barrel 1b about the optical axis. The operation amount on the side of the operation ring 10 can be transmitted to the focus adjustment mechanism 5 as a movement in the optical axis direction via 11a and 4b.

このような構成によれば、焦点調節操作を、後部鏡筒
1b側に設けられる操作リング10の回動操作により行なえ
る。そして、この回動操作は、前記螺旋状リード溝10
a、直進溝1gに係合するガイドピン12によって円筒部材1
1の光軸方向への動きに変換され、その動きが上述した
ように腕部11a,4bとこれらを連結するリング状部材13を
介して焦点調節機構５側に伝達され、所定の焦点調節動
作が行なわれることは、容易に理解されよう。According to this structure, the focus adjustment operation is performed on the rear lens barrel.
This can be done by rotating the operation ring 10 provided on the 1b side. Then, this rotation operation is performed by the spiral lead groove 10
a, the cylindrical member 1 by the guide pin 12 engaging with the straight groove 1g
1 is converted to a movement in the optical axis direction, and the movement is transmitted to the focus adjusting mechanism 5 side via the arm portions 11a, 4b and the ring-shaped member 13 connecting these as described above, and a predetermined focus adjusting operation is performed. It is easy to understand that is done.

一方、このようなレンズ鏡胴１を、前部鏡筒1aの三脚
座３により三脚に取付けて支持させた状態で撮影を行な
っているときに、像位置を横位置から縦位置等に変換し
ようとする必要が生じたときには、前、後部鏡筒1a,1b
の連結部を固定しているビス８を緩め、前部鏡筒1aに対
して後部鏡筒1bおよびカメラ本体２を相対的に光軸回り
で回転変位させ、希望する像位置を得られるまで回転さ
せた後、再度ビス８で固定することで前、後部鏡筒1a,1
bを連結し相対的な回転を阻止するとよい。On the other hand, when taking a picture with such a lens barrel 1 mounted and supported on a tripod by the tripod mount 3 of the front lens barrel 1a, let's change the image position from the horizontal position to the vertical position. When the need arises, the front and rear lens barrels 1a, 1b
Loosen the screw 8 that fixes the connecting part of the, and relatively rotate the rear lens barrel 1b and the camera body 2 around the optical axis with respect to the front lens barrel 1a, and rotate until the desired image position is obtained. Then, fix it with the screw 8 again, and the front and rear lens barrels 1a, 1
B may be connected to prevent relative rotation.

そして、このような構成によれば、像位置変換機構と
焦点調節操作部材（操作リング10）との配設位置関係を
独立して別々に配慮することが可能となり、光学設計上
で指定されたレンズ開口絞り部近傍に像位置変換機構を
配設することで、絞り調整機構６を保持する延設部によ
る重量増加問題を防ぎ、また絞り部がカメラ本体２側に
近い位置に設けられ、像位置変換機構を絞り部近傍に配
設できない場合でも、絞り調整機構６は後部鏡筒1b内に
位置し、この機構６を保持する延設部を全く必要とせ
ず、重量増加には全く無関係であり、レンズ開口絞りの
許容設定域を広範囲とし、自由に設定することができ
る。さらに、この設定に関して焦点調整操作部材の配設
位置は何ら関与せず、操作者の操作性のみを考慮すれば
よく、その利点は明らかであろう。すなわち、従来構造
では操作性を考慮するために、焦点調節つまみの配設位
置が限定され、これに伴なって像位置変換機構の配設位
置が限定され、さらにこれに伴なってレンズ鏡筒１の重
量を考慮することによりレンズ開口絞り制御機構の配設
位置も限定されることから、光学設計上での自由度が少
なく、充分な光学性能を引き出せない可能性を生じてい
たが、本考案によれば、このような問題点を一掃し得る
ものである。With such a configuration, the positional relationship between the image position conversion mechanism and the focus adjustment operation member (operation ring 10) can be considered separately and separately, which is specified in the optical design. By disposing the image position conversion mechanism in the vicinity of the lens aperture stop, the problem of weight increase due to the extended portion holding the diaphragm adjustment mechanism 6 is prevented, and the stop is provided at a position close to the camera body 2 side. Even if the position conversion mechanism cannot be arranged in the vicinity of the diaphragm, the diaphragm adjusting mechanism 6 is located in the rear lens barrel 1b, does not require any extension for holding the mechanism 6, and has no relation to an increase in weight. Therefore, the allowable setting range of the lens aperture diaphragm can be widened and can be freely set. Furthermore, the position of the focus adjustment operating member is not involved in this setting, and only the operability of the operator needs to be considered, and the advantage thereof will be clear. That is, in the conventional structure, in order to take operability into consideration, the disposition position of the focus adjustment knob is limited, and accordingly, the disposition position of the image position conversion mechanism is limited, and accordingly, the lens barrel is also restricted. Since the arrangement position of the lens aperture stop control mechanism is also limited by considering the weight of 1, the degree of freedom in optical design is small, and there is a possibility that sufficient optical performance cannot be obtained. According to the invention, such a problem can be eliminated.

なお、上述した実施例において、焦点調節操作部材と
して操作リング10を用いたのは、前、後部鏡筒1a,1bを
相対的に回動調整したときに、操作部材の操作性に影響
を与えないようにするためである。In the above-described embodiment, the operation ring 10 is used as the focus adjustment operation member because it affects the operability of the operation member when the front and rear lens barrels 1a and 1b are relatively rotationally adjusted. This is to prevent it from happening.

また、本考案によれば、前部鏡筒1aと後部鏡筒1bとの
間での焦点調節系の連結にあたって、円周方向に相対的
な回転が可能となる空回り機構を設けているので、像位
置変換操作に伴ない後部鏡筒1b側での焦点調節系である
円筒部材11や腕11aの回転に伴ない、前部鏡筒1a側に設
けられた焦点調節機構５との相対的な回転変位により生
じるモーメントが前、後部鏡筒1a,1bに設けられたそれ
ぞれの腕4b,11aに生じることがなく、これらの腕4b,11a
は焦点調節のための光軸方向での進退動作の際に生じる
引張り、圧縮力に耐えられる太さとすればよく、モーメ
ントが腕に生じる場合に比べると非常に細くてよいの
で、焦点調節系を離間して設けることによる重量増加を
問題とする必要はない。Further, according to the present invention, when connecting the focus adjustment system between the front lens barrel 1a and the rear lens barrel 1b, the idle rotation mechanism that enables relative rotation in the circumferential direction is provided. Along with the rotation of the cylindrical member 11 and the arm 11a, which are the focus adjustment system on the rear lens barrel 1b side due to the image position conversion operation, the relative movement to the focus adjustment mechanism 5 provided on the front lens barrel 1a side is performed. The moment generated by the rotational displacement is not generated in the arms 4b and 11a provided on the front and rear lens barrels 1a and 1b, respectively.
Is a thickness that can withstand the tension and compression forces that occur during the forward / backward movement in the optical axis direction for focus adjustment, and can be extremely thin compared to the case where a moment is generated in the arm, so use a focus adjustment system. There is no need to consider the increase in weight due to the provision of the separate members.

ここで、レンズ開口絞りの設定位置により前、後部鏡
筒1a,1bを連結結合するビス８が、撮影者から遠い位置
に設けられる場合もあるが、像位置変換使用頻度は、焦
点調節に比べて非常に少なく、要はカメラ本体２のファ
インダを覗いて像位置を確認しながら操作可能な位置に
あればよいもので、焦点調節操作部材のような使用頻度
の高いものとは比較にならず、実用上問題のないもので
ある。なお、このようなビス８の操作が行ない難い場合
でも、たとえば像位置変換機構の係止手段にクリック方
式を採用すれば、操作性の問題は解決できる。Here, the screw 8 that connects and connects the front and rear lens barrels 1a and 1b may be provided at a position far from the photographer depending on the setting position of the lens aperture stop. The number is very small, and the point is that the camera can be operated while checking the image position by looking into the viewfinder of the camera body 2, which is not comparable to a frequently used one such as a focus adjustment operation member. , Practically no problem. Even if it is difficult to operate the screw 8 as described above, the operability problem can be solved by adopting a click method for the locking means of the image position conversion mechanism, for example.

また、像位置変換機構がカメラ本体２から離れる程、
後部鏡筒1bが長くなり、操作部の重量が増大するが、長
焦点のレンズ鏡筒の重量は、通常、合焦用の光学レンズ
系など、被写体側にある前側光学系とそれを保持する部
材が、その殆どを占めているので、操作性に関しての問
題とはならない量である。Further, the farther the image position conversion mechanism is from the camera body 2,
Although the rear lens barrel 1b becomes long and the weight of the operation unit increases, the weight of the long focus lens barrel normally holds the front optical system on the subject side and the same, such as an optical lens system for focusing. Since the member occupies most of it, the amount is not a problem in terms of operability.

なお、本考案は上述した実施例構造に限定されず、レ
ンズ鏡筒１各部の形状、構造等を、適宜変形、変更する
ことは自由で、種々の変形例が考えられよう。It should be noted that the present invention is not limited to the structure of the embodiment described above, and the shape, structure, etc. of each part of the lens barrel 1 can be appropriately modified and changed, and various modified examples can be considered.

〔考案の効果〕[Effect of device]

以上説明したように本考案に係るレンズ鏡筒によれ
ば、前部鏡筒内に光学レンズ系を光軸方向に可動調節す
る焦点調節機構を設けるとともに、前部鏡筒に対し光軸
回りに回動可能な状態で連結される後部鏡筒の後端側に
焦点調節操作部材を配設し、かつこれら前部鏡筒内の焦
点調節機構と後部鏡筒側の焦点調節操作部材とを、光軸
回りで相対的に回転変位可能な状態で連結するようにし
たので、簡単な構成にもかかわらず、焦点調節操作部材
を後部鏡筒のカメラ本体側に設けることで、前、後部鏡
筒の連結部と焦点調節操作部材との配設関係を独立させ
て考慮でき、優れた光学性能が得られる位置にレンズ開
口絞り調整機構を配設することを可能とし、しかもこの
配設位置によって焦点調節操作性を維持するためにレン
ズ鏡筒での重量増加などを招くといった問題を一掃し得
る等の実用上種々優れた効果がある。As described above, according to the lens barrel of the present invention, the focus adjustment mechanism for movably adjusting the optical lens system in the optical axis direction is provided in the front lens barrel, and the front lens barrel is provided around the optical axis. A focus adjustment operation member is provided on the rear end side of the rear barrel that is rotatably connected, and the focus adjustment mechanism inside the front barrel and the focus adjustment member on the rear barrel side are Despite the simple structure, the focus adjustment operation member is provided on the camera body side of the rear lens barrel, so that the front and rear lens barrels can be relatively rotated about the optical axis. It is possible to independently consider the arrangement relationship between the connecting portion of the lens and the focus adjustment operation member, and it is possible to arrange the lens aperture stop adjustment mechanism at a position where excellent optical performance is obtained. To maintain adjustment operability, do not increase the weight of the lens barrel. There are practically various excellent effects such as may wipe out problem leads to.

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

第１図は本考案に係るレンズ鏡筒の一実施例を示す要部
を断面した概略側面図、第２図は本考案を特徴づける
前、後部鏡筒での焦点調節系の連結部構造を拡大して示
す拡大図である。 １……レンズ鏡筒、1a……前部鏡筒、1b……後部鏡筒、
1c……環状突部、1f……環状溝、1g……直進溝、1i……
円筒部、２……カメラ本体、３……三脚座、４……光学
レンズ系、4b……腕、５……焦点調節機構、６……レン
ズ開口絞り調整機構、８……調整用ビス、10……焦点調
節用操作リング、10a……螺旋状リード溝、11……円筒
部材、11a……腕、12……ガイドピン、13……リング状
部材、13a……環状溝、15……ガイドピン。FIG. 1 is a schematic side view of an essential part showing an embodiment of a lens barrel according to the present invention, and FIG. 2 shows a connecting structure of a focus adjusting system in a rear lens barrel before characterizing the present invention. It is an enlarged view which expands and shows. 1 ... Lens barrel, 1a ... Front barrel, 1b ... Rear barrel,
1c …… annular protrusion, 1f …… annular groove, 1g …… straight groove, 1i ……
Cylindrical part, 2 ... Camera body, 3 ... Tripod seat, 4 ... Optical lens system, 4b ... Arm, 5 ... Focus adjustment mechanism, 6 ... Lens aperture stop adjustment mechanism, 8 ... Adjustment screw, 10 …… Focus adjustment operation ring, 10a …… Spiral lead groove, 11 …… Cylindrical member, 11a …… Arm, 12 …… Guide pin, 13 …… Ring member, 13a …… Annular groove, 15 …… guide pin.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項１】前部鏡筒とこの前部鏡筒に対し光軸回りに
回動可能な状態で連結されている後部鏡筒とを備えてな
るレンズ鏡筒において、 前記前部鏡筒内に光学レンズ系を光軸方向に可動調節す
る焦点調節機構を設けるとともに、 前記後部鏡筒の前部鏡筒との連結部よりも後端側に焦点
調節操作部材を配設し、 かつこれら前部鏡筒内の焦点調節機構と後部鏡筒側の焦
点調節操作部材とを、光軸回りで相対的に回転変位可能
な状態で連結したことを特徴とするレンズ鏡筒。1. A lens barrel comprising a front lens barrel and a rear lens barrel rotatably connected to the front lens barrel about an optical axis, wherein: Is provided with a focus adjustment mechanism for moving the optical lens system in the optical axis direction, and a focus adjustment operation member is provided on the rear end side of the connecting portion of the rear lens barrel with the front lens barrel, and A lens barrel, wherein a focus adjusting mechanism in the rear lens barrel and a focus adjusting operation member on the rear lens barrel side are connected in a state capable of relative rotational displacement about the optical axis.