JPH0784307A - Extension tube - Google Patents
Extension tubeInfo
- Publication number
- JPH0784307A JPH0784307A JP25245893A JP25245893A JPH0784307A JP H0784307 A JPH0784307 A JP H0784307A JP 25245893 A JP25245893 A JP 25245893A JP 25245893 A JP25245893 A JP 25245893A JP H0784307 A JPH0784307 A JP H0784307A
- Authority
- JP
- Japan
- Prior art keywords
- contact pin
- movable contact
- intermediate ring
- movable
- camera body
- 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
Links
Landscapes
- Lens Barrels (AREA)
- Structure And Mechanism Of Cameras (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はオートフォーカスの一眼
レフカメラのカメラボディと交換レンズとの間に介在し
て、このカメラボディと交換レンズとの間で情報を伝達
したり、焦点距離変換やフランジバック変換などの機能
を有する中間リングに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is interposed between a camera body of an autofocus single-lens reflex camera and an interchangeable lens to transmit information between the camera body and the interchangeable lens and to convert focal length. The present invention relates to an intermediate ring having functions such as flange back conversion.
【０００２】[0002]
【従来の技術】図５は従来の中間リングの電気接点構造
を示す縦断面図であり、図５において、１０は一眼レフ
カメラのカメラボディ、２０は中間リング、３０は交換
レンズ鏡筒である。１１はカメラボディ１０の固定部
材、１２は中間リング２０を取付けるためのカメラマウ
ントであり、ビス１３で上記固定部材１１の端面に固定
されている。２１はカメラマウント１２とバヨネット爪
部等（図示せず）を介して係合固定される中間マウント
であり、ビス２２で中間リング本体２３の端面に固定さ
れている。2. Description of the Related Art FIG. 5 is a longitudinal sectional view showing a conventional electrical contact structure of an intermediate ring. In FIG. 5, 10 is a camera body of a single lens reflex camera, 20 is an intermediate ring, and 30 is an interchangeable lens barrel. . Reference numeral 11 is a fixing member of the camera body 10, and 12 is a camera mount for attaching the intermediate ring 20, which is fixed to the end surface of the fixing member 11 with a screw 13. Reference numeral 21 is an intermediate mount that is engaged and fixed to the camera mount 12 via bayonet claws and the like (not shown), and is fixed to the end surface of the intermediate ring body 23 with screws 22.
【０００３】また、この中間リング本体２３の交換レン
ズ側の端面には中間マウント２４がビス２５により固定
されている。３１は交換レンズ鏡筒固定部であり、中間
リング２０に対向する端面にレンズマウント３２がビス
３３により固定されており、このレンズマウント３２は
中間マウント２４とバヨネット爪等で係合固定される。An intermediate mount 24 is fixed by screws 25 to the end surface of the intermediate ring body 23 on the interchangeable lens side. Reference numeral 31 is an interchangeable lens barrel fixing portion, and a lens mount 32 is fixed to an end surface facing the intermediate ring 20 with a screw 33. The lens mount 32 is engaged and fixed to the intermediate mount 24 with a bayonet claw or the like.
【０００４】２６は固定接点であり、中間マウント２１
の内径部にビス２７や接着等により固定されている。こ
の固定接点２６の光軸Ａ−Ａ’方向に沿って交換レンズ
側端面は、光軸に対し垂直な平面部を有しており、カメ
ラボディ１０に光軸方向移動可能に設けた可動接点ピン
１４の端面を受けている。Reference numeral 26 denotes a fixed contact, which is an intermediate mount 21.
It is fixed to the inner diameter portion by screws 27 or adhesive. An end surface of the fixed contact 26 on the side of the interchangeable lens along the optical axis AA ′ has a flat surface portion perpendicular to the optical axis, and a movable contact pin provided on the camera body 10 so as to be movable in the optical axis direction. It receives 14 end faces.
【０００５】３４は固定接点であり、レンズマウント３
２の内径部にビス３５や接着等により固定されている。
この固定接点３４の光軸方向Ａ−Ａに沿った中間リング
本体側端面は、光軸に対し垂直な平面部を有しており、
中間リング本体２０に光軸方向移動可能に設けた可動接
点ピン２８の端面を受けている。Reference numeral 34 denotes a fixed contact, which is the lens mount 3
It is fixed to the inner diameter portion of 2 by a screw 35 or an adhesive.
An end surface of the fixed contact 34 on the side of the intermediate ring main body along the optical axis direction A-A has a flat surface portion perpendicular to the optical axis,
The intermediate ring body 20 receives an end face of a movable contact pin 28 provided so as to be movable in the optical axis direction.
【０００６】１５はカメラボディ内の電気回路からの信
号を可動接点ピン１４に伝えるリード線、２９は中間リ
ング本体２０内の固定接点２６と可動接点ピン２８とを
接続するリード線、３６は固定接点３４と交換レンズ鏡
筒内の電気回路等とを接続するリード線である。１４ａ
は可動接点ピン１４を固定接点２６に加圧接触させるコ
イルバネ、１６は可動接点ピン１４とコイルバネ１４ａ
とを支える可動接点カバー、２８ａは可動接点ピン２８
を固定接点３４に加圧接触させるコイルバネ、２３ａは
可動接点ピン２８とコイルバネ２８ａと支える可動接点
カバーである。Reference numeral 15 is a lead wire for transmitting a signal from an electric circuit in the camera body to the movable contact pin 14, 29 is a lead wire for connecting the fixed contact 26 and the movable contact pin 28 in the intermediate ring body 20, and 36 is a fixed wire. It is a lead wire that connects the contact point 34 to an electric circuit or the like in the interchangeable lens barrel. 14a
Is a coil spring that presses the movable contact pin 14 into contact with the fixed contact 26, and 16 is the movable contact pin 14 and the coil spring 14a.
And a movable contact cover 28a for supporting the movable contact pin 28a.
Is a coil spring that press-contacts the fixed contact 34, and 23a is a movable contact cover that supports the movable contact pin 28 and the coil spring 28a.
【０００７】いま、上記の構成においてカメラボディ１
０側から中間リング２０を介して交換レンズ鏡筒３０へ
電気信号を伝えようとすると、その伝達経路は、カメラ
ボディ内電気回路→リード線１５→可動接点ピン１４→
中間リング２０内の固定接点２６→リード線２９→可動
接点ピン２８→交換レンズ鏡筒３０内の固定接点３４→
リード線３６→交換レンズ内電気回路となる。Now, in the above structure, the camera body 1
When an electric signal is transmitted from the 0 side to the interchangeable lens barrel 30 via the intermediate ring 20, the transmission path is as follows: the electric circuit in the camera body → the lead wire 15 → the movable contact pin 14 →
Fixed contact 26 in the intermediate ring 20 → lead wire 29 → movable contact pin 28 → fixed contact 34 in the interchangeable lens barrel 30 →
The lead wire 36 becomes an electric circuit in the interchangeable lens.
【０００８】また、上記とは反対に交換レンズ鏡筒３０
からカメラボディ１０へ電気信号を伝える場合も上記の
信号伝達経路の逆順に行なわれる。Contrary to the above, the interchangeable lens barrel 30
The electric signal is transmitted from the camera body 10 to the camera body 10 in the reverse order of the signal transmission path.
【０００９】[0009]
【発明が解決しようとしている課題】しかしながら、上
記従来では、中間リング２０内に設けた電気接点構造が
複雑であり、コスト高であり、組立工程も多くなる。ま
た、中間リング２０の光軸方向の厚さを薄くしたい場
合、中間リング２０内の可動接点ピン２８の長さ、コイ
ルバネ２８ａの長さ、可動接点ピン２８のストローク、
固定接点２６の長さ等により制約があり、限界があっ
た。また、中間リング２０の内部で固定接点２６と可動
接点ピン２８をリード線２９で接続しているため、信頼
性が低く、耐久性がない等の問題点があった。However, in the above-mentioned prior art, the structure of the electric contact provided in the intermediate ring 20 is complicated, the cost is high, and the number of assembling steps is large. When it is desired to reduce the thickness of the intermediate ring 20 in the optical axis direction, the length of the movable contact pin 28 in the intermediate ring 20, the length of the coil spring 28a, the stroke of the movable contact pin 28,
There was a limitation due to the length of the fixed contact 26, etc. Further, since the fixed contact 26 and the movable contact pin 28 are connected by the lead wire 29 inside the intermediate ring 20, there are problems such as low reliability and no durability.
【００１０】本発明は上記のような問題点を解消した中
間リングを得ることを目的とする。An object of the present invention is to obtain an intermediate ring which solves the above problems.
【００１１】[0011]
【課題を解決するための手段】本発明によれば、交換レ
ンズ鏡筒とカメラボディとの間に介在して両者間で情報
を伝達する中間リングにおいて、前記交換レンズ鏡筒の
マウント部に設けた複数個のレンズ側接点とカメラボデ
ィに前記レンズ側接点に夫々対応して設けた複数個のカ
メラ接点との双方に接し光軸方向に移動可能に支持した
可動接点ピンを具備したことにより、電気接点構造を簡
略化し、信頼性の向上とコストダウン及び薄型化に対応
し得る中間リングを実現することができる。According to the present invention, an intermediate ring, which is interposed between an interchangeable lens barrel and a camera body to transmit information therebetween, is provided at a mount portion of the interchangeable lens barrel. By providing a movable contact pin that is in contact with both the plurality of lens side contacts and the plurality of camera contacts provided corresponding to the lens side contacts on the camera body, and is supported so as to be movable in the optical axis direction, It is possible to simplify the electrical contact structure and realize an intermediate ring that can improve reliability, reduce cost, and reduce thickness.
【００１２】[0012]
【実施例】図１は本発明の実施例を示し、本発明の特徴
を最もよく表わす図面であり、図１において、カメラボ
ディ１０、交換レンズ鏡筒３０は前記図５に示す従来例
と同一であるから、同一部分には同一符号を付して重複
説明を省略する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a view showing an embodiment of the present invention and is a drawing which best shows the features of the present invention. In FIG. Therefore, the same portions are denoted by the same reference numerals and duplicate description will be omitted.
【００１３】１はカメラボディ１０と交換レンズ鏡筒３
０の間に介在させた中間リング、２は略中央部に段差部
としての鍔部２ａを有する可動接点ピン、３は中間リン
グ内径に固定されている可動接点ピン２のガイドであ
り、このガイド３は絶縁体でできている。４は可動接点
ピン２が接点ピンガイド３から離脱しないための絶縁体
でできている接点ピンガイドカバー、５は中間リング本
体である。Reference numeral 1 denotes a camera body 10 and an interchangeable lens barrel 3
An intermediate ring 2 interposed between 0 and 2 is a movable contact pin having a flange portion 2a as a stepped portion at a substantially central portion, and 3 is a guide of the movable contact pin 2 fixed to the inner diameter of the intermediate ring. 3 is made of an insulator. Reference numeral 4 is a contact pin guide cover made of an insulator for preventing the movable contact pin 2 from coming off the contact pin guide 3, and 5 is an intermediate ring body.
【００１４】上記可動接点ピン２は接点ピンガイド３及
び接点ピンガイドカバー４により、光軸Ａ−Ａ’と平行
方向に多少移動可能に支持されている。The movable contact pin 2 is supported by the contact pin guide 3 and the contact pin guide cover 4 so as to be movable to some extent in the direction parallel to the optical axis AA '.
【００１５】上記の構成による中間リングの電気接点部
の動作を、その電気接点部を拡大して示す図２について
説明する。The operation of the electric contact portion of the intermediate ring having the above structure will be described with reference to FIG. 2 which shows the electric contact portion in an enlarged manner.
【００１６】図２において、交換レンズ鏡筒３０と中間
リング１とカメラボディ１０がマウント１２と中間リン
グ本体１、中間リング本体１の端面にビス６で固定され
ているマウント７とマウント３２の係合により相互に取
付けられており、この時の可動接点ピン２の位置を０と
する。また、カメラボディ１０側の可動接点ピン１４の
ストロークをａ、コイルバネ１４ａのバネ定数をｋとす
る。In FIG. 2, the interchangeable lens barrel 30, the intermediate ring 1, and the camera body 10 are mounted on the mount 12, the intermediate ring body 1, and the mount 7 and the mount 32 fixed to the end surface of the intermediate ring body 1 with screws 6. The movable contact pin 2 and the movable contact pin 2 are attached to each other at the same time. The stroke of the movable contact pin 14 on the camera body 10 side is a, and the spring constant of the coil spring 14a is k.
【００１７】また、上記の可動接点ピン２は光軸と平行
方向に移動可能に、δ1 、δ2 のすきまをもって支持さ
れており、これ等の値を用いて可動接点ピン２の動きを
まとめると下表のようになる。The movable contact pin 2 is supported so as to be movable in the direction parallel to the optical axis with a clearance of δ 1 and δ 2 , and these values are used to summarize the movement of the movable contact pin 2. And it becomes like the following table.
【００１８】[0018]
【表１】 上記の表より明らかなように、 中間リング１のみの場合、可動接点ピン２は光軸方向
にδ1 〜０〜δ2 の余裕をもって支持されているため、
位置は決定されない。[Table 1] As apparent from the above table, when only the intermediate ring 1, since the movable contact pin 2 is supported with a margin of [delta] 1 ～0～Deruta 2 in the optical axis direction,
The position is not determined.
【００１９】中間リングとカメラボディの場合、可動
接点ピン２はカメラボディ内の可動接点ピン１４とコイ
ルバネ１４ａにより光軸方向に押されて片寄せされ、鍔
部２ａが空間８の壁面に当接するすきまδ1 動いたとこ
ろでｋ・（Ａ−δ1 ）のチャージ力を受ける。この際、
（Ａ−δ1 ）＞０でなければならない。In the case of the intermediate ring and the camera body, the movable contact pin 2 is pushed in the optical axis direction by the movable contact pin 14 and the coil spring 14a in the camera body to be biased, and the collar portion 2a contacts the wall surface of the space 8. When the clearance δ 1 moves, it receives a charging force of k · (A-δ 1 ). On this occasion,
It must be (A-δ 1 )> 0.
【００２０】交換レンズ鏡筒と中間リングの場合、可
動接点ピン１６は光軸方向にすきまδ2 のガタを有し、
位置は決定されない。In the case of the interchangeable lens barrel and the intermediate ring, the movable contact pin 16 has a play of a clearance δ 2 in the optical axis direction,
The position is not determined.
【００２１】交換レンズ鏡筒と中間リング及びカメラ
ボディの場合、可動接点ピン２は鍔部２ａが空間８の中
間に位置するだけ移動して光軸方向０の位置に停止す
る。その際、チャージ圧ｋ・Ａを受けるが、このチャー
ジ圧ｋ・Ａは中間リング１のない状態と同条件になる。In the case of the interchangeable lens barrel, the intermediate ring and the camera body, the movable contact pin 2 is moved by the position where the collar portion 2a is located in the middle of the space 8 and stopped at the position in the optical axis direction 0. At that time, although the charge pressure k · A is received, this charge pressure k · A is the same as the condition without the intermediate ring 1.
【００２２】上記、の状態では可動接点ピン２の位
置は定まらないが、カメラボディ１０への取付けにより
該カメラボディ内の可動接点ピン１４及びバネ１４ａに
より、中間リング１内の可動接点ピン２の位置が決定さ
れる。In the above state, the position of the movable contact pin 2 is not fixed, but when the movable contact pin 2 is attached to the camera body 10, the movable contact pin 14 and the spring 14a in the camera body cause the movable contact pin 2 in the intermediate ring 1 to move. The position is determined.
【００２３】従来は前記図５に示すように、一対の接点
に対しそれぞれ接点圧発生用バネを用いているが、本実
施例では中間リング１内の可動接点ピン２の接点圧発生
用バネとして、カメラボディ１０内の可動接点ピン１４
を押圧するバネ１４ａを利用している。Conventionally, as shown in FIG. 5, a contact pressure generating spring is used for each of a pair of contacts, but in this embodiment, it is used as a contact pressure generating spring for the movable contact pin 2 in the intermediate ring 1. , The movable contact pin 14 in the camera body 10
The spring 14a that presses is used.
【００２４】なお、図４は本発明の中間リングを用いる
ことなく、カメラボディ１０に直接交換レンズ鏡筒３０
を連結した状態を示す。In FIG. 4, the interchangeable lens barrel 30 is directly attached to the camera body 10 without using the intermediate ring of the present invention.
Shows a state in which are connected.
【００２５】[0025]
【発明の効果】以上説明したように、本発明によれば、
交換レンズ鏡筒のマウント部に設けた固定接点と対応す
るカメラボディのマウント部に設けた可動接点ピンと
を、中間リングに光軸方向に移動可能に支持された可動
接点ピンを介して接続し、その接点圧発生用バネをカメ
ラボディのマウント部に設けた可動接点ピンに対するバ
ネのバネ力を利用するように構成したので、中間リング
内の接点構造が大幅に簡略化され、以下のような効果が
得られる。As described above, according to the present invention,
The fixed contact provided on the mount part of the interchangeable lens barrel and the movable contact pin provided on the mount part of the corresponding camera body are connected to the intermediate ring via the movable contact pin movably supported in the optical axis direction, Since the contact pressure generating spring is configured to utilize the spring force of the spring with respect to the movable contact pin provided on the mount part of the camera body, the contact structure in the intermediate ring is greatly simplified, and the following effects Is obtained.
【００２６】ａ）中間リング内の接点構造による光軸方
向長さの制約が小さくなり、中間リング自体の光軸方向
の長さを小さくでき、中間リングの薄型化を実現でき
る。A) The restriction on the length in the optical axis direction due to the contact structure in the intermediate ring is reduced, the length of the intermediate ring itself in the optical axis direction can be reduced, and the intermediate ring can be made thinner.
【００２７】ｂ）接点構造が簡素化されるため、部品点
数が少なくなり、組立性が向上し、かつ、コスト安にな
る。B) Since the contact structure is simplified, the number of parts is reduced, the assemblability is improved, and the cost is reduced.
【００２８】ｃ） 中間リング内における信頼性の低か
った接点同士の結線のためのリード線及びそのハンダ付
け等がなくなり、信頼性が向上する。C) The reliability of the intermediate ring is improved because the lead wires and the soldering for connecting the contacts, which have low reliability in the intermediate ring, are eliminated.
【図１】 本発明の実施例を示す中間リングの取付状態
の縦断面図FIG. 1 is a vertical cross-sectional view of an attached state of an intermediate ring showing an embodiment of the present invention.
【図２】 図１の中間リングの接点部の詳細図FIG. 2 is a detailed view of a contact portion of the intermediate ring of FIG.
【図３】 本発明の実施例を示す中間リングのカメラ側
からの正面図FIG. 3 is a front view from the camera side of an intermediate ring showing an embodiment of the present invention.
【図４】 中間リングを用いない時の通常の使用状態を
示した縦断面図FIG. 4 is a vertical cross-sectional view showing a normal use state when an intermediate ring is not used.
【図５】 従来の中間リングの取付状態を示す縦断面図FIG. 5 is a vertical cross-sectional view showing a mounting state of a conventional intermediate ring
１ 中間リング ２ 可動接点ピン ２ａ 鍔部（段差部） １０ カメラボディ １４ カメラ接点 ３０ 交換レンズ鏡筒 ３２ マウント部 ３４ レンズ側接点 1 Intermediate Ring 2 Movable Contact Pin 2a Collar (Step) 10 Camera Body 14 Camera Contact 30 Interchangeable Lens Barrel 32 Mount Part 34 Lens Side Contact
Claims (2)
介在して両者間で情報を伝達する中間リングにおいて、
前記交換レンズ鏡筒のマウント部に設けた複数個のレン
ズ側接点とカメラボディに該レンズ側接点に夫々対応し
て設けた複数個のカメラ接点との双方に接し光軸方向に
移動可能に支持した可動接点ピンを具備したことを特徴
とする中間リング。1. An intermediate ring, which is interposed between an interchangeable lens barrel and a camera body to transmit information therebetween,
A plurality of lens side contacts provided on the mount portion of the interchangeable lens barrel and a plurality of camera contacts provided on the camera body corresponding to the lens side contacts are supported so as to be movable in the optical axis direction. An intermediate ring having a movable contact pin.
移動量が規制される段差部を有することを特徴とする請
求項１記載の中間リング。2. The intermediate ring according to claim 1, wherein the movable contact pin has a stepped portion whose movement amount in the optical axis direction is regulated at a substantially central portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25245893A JPH0784307A (en) | 1993-09-14 | 1993-09-14 | Extension tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25245893A JPH0784307A (en) | 1993-09-14 | 1993-09-14 | Extension tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0784307A true JPH0784307A (en) | 1995-03-31 |
Family
ID=17237666
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25245893A Pending JPH0784307A (en) | 1993-09-14 | 1993-09-14 | Extension tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0784307A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3076237A2 (en) | 2015-03-31 | 2016-10-05 | Canon Kabushiki Kaisha | Apparatus body of image pickup apparatus and lens adapter for equipping interchangeable lens to apparatus body |
-
1993
- 1993-09-14 JP JP25245893A patent/JPH0784307A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3076237A2 (en) | 2015-03-31 | 2016-10-05 | Canon Kabushiki Kaisha | Apparatus body of image pickup apparatus and lens adapter for equipping interchangeable lens to apparatus body |
| EP3267250A1 (en) | 2015-03-31 | 2018-01-10 | Canon Kabushiki Kaisha | Lens adapter for equipping interchangeable lens to apparatus body |
| US10764477B2 (en) | 2015-03-31 | 2020-09-01 | Canon Kabushiki Kaisha | Apparatus body of image pickup apparatus and lens adapter for equipping interchangeable lens to apparatus body |
| US11323601B2 (en) | 2015-03-31 | 2022-05-03 | Canon Kabushiki Kaisha | Apparatus body of image pickup apparatus and lens adapter for equipping interchangeable lens to apparatus body |
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