JPS5944611B2 - Zoom lens structure - Google Patents
Zoom lens structureInfo
- Publication number
- JPS5944611B2 JPS5944611B2 JP2493481A JP2493481A JPS5944611B2 JP S5944611 B2 JPS5944611 B2 JP S5944611B2 JP 2493481 A JP2493481 A JP 2493481A JP 2493481 A JP2493481 A JP 2493481A JP S5944611 B2 JPS5944611 B2 JP S5944611B2
- Authority
- JP
- Japan
- Prior art keywords
- aperture
- ring
- cam
- lens
- preset
- 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.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lens Barrels (AREA)
- Diaphragms For Cameras (AREA)
- Mechanical Light Control Or Optical Switches (AREA)
Description
【発明の詳細な説明】
本発明はTTL開放測光方式の露光計を有する一眼レフ
レツクスカメラ用の交換レンズとして使用されるズーム
レンズに関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a zoom lens used as an interchangeable lens for a single-lens reflex camera having a TTL aperture metering type exposure meter.
従来知られているズームレンズに於ては一般には絞りの
開放口径が一定である。が、ズーム域の一部或いは全域
で口径の変化するものがある。このようなズームレンズ
をTTL開放測光方式の露光計と組合せた場合焦点距離
、絞り口径の変化に応じて露光値の補正を行う必要が生
ずる。又受光素子の配置される位置によつて、特にペン
タプリズムの周辺に受光素子を配置した様なカメラに於
ては光路のケラレ等によつて受光素子に入射する光量の
誤差もレンズの焦点距離絞り開口によつて変化するもの
で、これ等の誤差の補正も考慮する必要がある。In conventionally known zoom lenses, the aperture aperture is generally constant. However, some lenses have apertures that change over part or the entire zoom range. When such a zoom lens is combined with a TTL aperture metering type exposure meter, it becomes necessary to correct the exposure value in accordance with changes in focal length and aperture aperture. Also, depending on the position of the light receiving element, errors in the amount of light incident on the light receiving element due to vignetting of the optical path, etc., especially in cameras where the light receiving element is placed around a pentaprism, can also affect the focal length of the lens. It changes depending on the diaphragm aperture, and it is necessary to consider correction of these errors.
本発明はズーム動作に応じて絞り開口を変化させる様な
ズームレンズに於て、上記の様な補正を行い得る交換可
能なレンズ構体を提供することを目的とするもので、そ
の特徴とする処はズーム動作に応じて絞りユニット、プ
リセット装置等の絞り補正手段によつて絞り口径又は絞
り口径比を補正し、その補正した情報又は絞り値の情報
をレンズ側からカメラ側に入力し露光計に対する補正手
段として役立たせるためズームレンズ構体にその情報を
表わす信号手段を配設し露光演算を補正する様にした点
に存するものである。An object of the present invention is to provide an interchangeable lens structure capable of performing the above-mentioned correction in a zoom lens whose aperture aperture is changed in accordance with zoom operation. Corrects the aperture aperture or aperture ratio according to the zoom operation using an aperture correction means such as an aperture unit or preset device, inputs the corrected information or aperture value information from the lens side to the camera side, and inputs it to the exposure meter. In order to serve as a correction means, a signal means representing the information is provided in the zoom lens structure, and the exposure calculation is corrected.
以下本発明実施例を図について説明する。Embodiments of the present invention will be described below with reference to the drawings.
図において1は鏡胴固定部、2はレンズ鏡胴をカメラ本
体に固定するための締付環、3は固定部1に一体的に結
合された摺動案内筒で第1レンズ群I及び第2レンズ群
■を保持する移動筒4、5がその内側に摺動し得るよう
に嵌合している。In the figure, 1 is a lens barrel fixing part, 2 is a tightening ring for fixing the lens barrel to the camera body, and 3 is a sliding guide tube integrally connected to the fixing part 1 for the first lens group I and the lens barrel. The movable barrels 4 and 5 that hold the second lens group (2) are slidably fitted inside the movable barrels 4, 5.
案内筒3は公知のように直線案内溝3a、3bを有し、
各移動筒に設けたキー6、Tが夫々嵌入J し、キー6
、7に固設したピン8、9がズーム操作環10と一体の
カム筒11に設けたカム溝Ila、Ilbに嵌入して、
操作環10の回動によつて各移動筒4、5を案内筒3内
で夫々前後に摺動して焦点距離の調節が行なわれる。S
第1レンズ群Iは保持枠12によつて保持され、該保
持枠12はその外周に設けたヘリコイドネジ12aによ
つて移動筒に螺合し、且つその前端に固設したピン15
が距離操作環14の直線溝14aに嵌入し、該操作環1
4の回動によつてヘリコイ0 ドネジ4a、12aの作
用で移動筒4内で前後に移動しフォーカシングが行われ
る。The guide tube 3 has linear guide grooves 3a and 3b as is known,
The keys 6 and T provided on each movable tube are inserted into the keys 6 and 6, respectively.
, 7 are fitted into cam grooves Ila and Ilb provided in a cam cylinder 11 integrated with the zoom operation ring 10,
By rotating the operation ring 10, the movable barrels 4 and 5 are slid back and forth within the guide barrel 3, thereby adjusting the focal length. S
The first lens group I is held by a holding frame 12, which is screwed into the movable tube by a helicoid screw 12a provided on its outer periphery, and has a pin 15 fixed at its front end.
is fitted into the straight groove 14a of the distance operation ring 14, and the operation ring 1
By the rotation of the helicoid 4, the helicoid 0 moves back and forth within the movable cylinder 4 by the action of the screws 4a and 12a, and focusing is performed.
距離操作環14は摺動案内筒3に固着した円筒部材16
に螺合し回動可能に保持される。The distance operation ring 14 is a cylindrical member 16 fixed to the sliding guide cylinder 3.
It is screwed together and held rotatably.
第2レンズ群■は絞りユニット17を挟んで枠155a
、5bによつて分担保持され、絞りユニット17及びプ
リセットカム18と一体となつて摺動案内筒3内を前後
に摺動し得るように構成される。The second lens group ■ has a frame 155a with the aperture unit 17 in between.
, 5b, and is configured to be able to slide back and forth within the sliding guide cylinder 3 integrally with the aperture unit 17 and preset cam 18.
絞りユニツト17は枠5に固定した保持環5と之に対し
て回動可能な作動環17aとの間に絞り羽根を保持する
公知の構造で、枠5に回動可能に保持されたプリセツト
カムリング18のカム部18aに係合するピン19a及
び作動環17aの係合部17bにストツパ一として働く
ピン19bを有するベルクランクレバ一19が枠5に軸
19cで枢着されており、作動環17aはその上に植設
されたピン17dに係止された弱いばね20で絞り込方
向へ付勢されている。21は絞り操作環22と一体的に
連結されたプリセツト部材で鏡胴内で光軸の周りに回動
し得る如く支承され、その前方へ伸びる腕21aは第3
図に示す様なカム溝21bを有し、該カム溝にはプリセ
ツトカムリング18の腕18cに固植したピン18bが
嵌入している。The diaphragm unit 17 has a known structure in which the diaphragm blades are held between a retaining ring 5 fixed to the frame 5 and an operating ring 17a that is rotatable relative to the holding ring 5, and has a preset blade rotatably held in the frame 5. A bell crank lever 19, which has a pin 19a that engages with the cam portion 18a of the cam ring 18 and a pin 19b that acts as a stopper on the engaging portion 17b of the operating ring 17a, is pivotally connected to the frame 5 by a shaft 19c, and the lever 19 is pivotally connected to the frame 5 by a shaft 19c. 17a is biased in the narrowing direction by a weak spring 20 that is engaged with a pin 17d implanted thereon. Reference numeral 21 denotes a preset member integrally connected to the diaphragm operation ring 22, which is supported within the lens barrel so as to be rotatable around the optical axis.
It has a cam groove 21b as shown in the figure, and a pin 18b fixed to the arm 18c of the preset cam ring 18 is fitted into the cam groove.
プリセツトリング21の後方へ伸びる腕21cはカメラ
内に設けた露光計に係合する。絞り操作環22は鏡胴固
定部との間にクリツクストツプ機構を有し、ばね20に
抗してセツト位置に静止する。A rearwardly extending arm 21c of the preset ring 21 engages with an exposure meter provided within the camera. The aperture operating ring 22 has a click stop mechanism between it and the lens barrel fixing portion, and rests at the set position against the force of the spring 20.
23は絞り作動環17aとカメラ側の絞り,駆動レバー
とを連動させるための連動部材で光軸を中心に回動し得
る如く支承されその前方へ伸びる腕23aが絞り作動環
17aの突起17cに係合し、強いばね24に付勢され
て常時は作動環17aをばね20に抗して絞り全開の位
置に保持する。Reference numeral 23 denotes an interlocking member for interlocking the diaphragm operating ring 17a, the diaphragm on the camera side, and the drive lever.It is supported so as to be rotatable around the optical axis, and an arm 23a extending forward is connected to the protrusion 17c of the diaphragm operating ring 17a. The actuating ring 17a is normally held in the fully open aperture position against the spring 20 by being engaged and biased by the strong spring 24.
又該部材23から後方へ伸びる腕23bはカメラ側の絞
り駆動レバー(図示せず)に係合し得る様に設けられる
。前記連動部材23の腕23aの作動環17に対する係
合面には第4図に示すようなカム面23cが形成されて
いる。An arm 23b extending rearward from the member 23 is provided so as to be able to engage with an aperture drive lever (not shown) on the camera side. A cam surface 23c as shown in FIG. 4 is formed on the engagement surface of the arm 23a of the interlocking member 23 with the operating ring 17. As shown in FIG.
第5図に於て26はカム板で連結杆25を介してカム筒
11に取り付けられズーム操作環10と一体的に回動し
得るように設けられる。In FIG. 5, a cam plate 26 is attached to the cam cylinder 11 via a connecting rod 25 so that it can rotate integrally with the zoom operation ring 10.
27は鏡胴後端に光軸方向へ摺動可能に支承された補正
ピンでばね28によつてカム板26のカム面26aにそ
の先端が常時係合するように付勢され、後端は鏡胴後端
から突出しカメラ側の露光計に係合する。Reference numeral 27 denotes a correction pin supported slidably in the optical axis direction at the rear end of the lens barrel, and is biased by a spring 28 so that its tip always engages with the cam surface 26a of the cam plate 26. It protrudes from the rear end of the lens barrel and engages with the exposure meter on the camera side.
土述の様な構成のズームレンズ構体に於てズーム操作環
10を回動させると、カム筒11が一体的に回動してそ
のカム溝11a,11bと、ピンノ8,9によつて移動
筒4,5は摺動案内筒3内で夫々直進移動し、焦点距離
の調節によりズーミング作用が行なわれる。When the zoom operation ring 10 is rotated in a zoom lens structure configured as described above, the cam barrel 11 rotates integrally and is moved by its cam grooves 11a, 11b and pins 8, 9. The tubes 4 and 5 each move linearly within the sliding guide tube 3, and a zooming effect is performed by adjusting the focal length.
その際絞りユニツカ7はレンズ報持枠5bと共に移動し
、絞り作動環17aの突起17cは連動環の腕23aの
カム面23cに沿つて回動するから絞り羽根が作動して
開放時に於ける絞り口径がズーミングに応じて規正され
図示しない受光素子に入射する光量が変化し、従つて露
光計のメーター指針の振れも変化する。この時プリセツ
トカムリング18も移動筒5と共に移動しその腕18c
上のピン18bはプリセツトリングの腕21aのカム溝
21bに沿つて回動するからカムリングのカム面18a
に係合するピン19aによつてベルクランクレバ一19
が回動し、絞り作動環17aの突起17cに対するピン
19bの位置は絞り作動環17aと該ピン19bの当接
によつて絞り口径の変化に応じて補正される。この状態
で絞り操作環22を回動させるとプリセツト部材21が
一体に回つて腕21cによつてその回動をカメラ内の露
光計に伝えると共にカム溝21b、ピン18bを介して
プリセツトカムリング18を回動させ露光計の指示に従
う適正な絞り値がプリセツトされる。続いてカメラのシ
ヤツターレリーズ動作に連動して絞り駆動レバーが連動
環23の腕23bをばね24に抗して押し一定量移動さ
せると絞り作動環17aはばね20に引かれて絞り込方
向に回動し、係合部17bがピン19bに当つた位置で
絞り口径が決定する。第5図に示す信号手段27はズー
ム操作環10の回動によつて前記の様な絞り開放口径の
変化とこれに応じたプリセツト位置の補正が行われると
共に、カム板26が回動して之に接する信号手段27が
光軸方向に移動する。信号手段27の突出量は開放口径
に応じた受光素子の受光量の誤差に対応して変化するよ
うにカム面26aが設計されているので露光計の指針或
は追針等がピン27の突出量Ll,L2・・・・・・に
応じて移動し、絞り操作環を操作したとき受光誤差が補
正された適当な絞り値がプリセツトされる。At this time, the diaphragm unit 7 moves together with the lens support frame 5b, and the protrusion 17c of the diaphragm operating ring 17a rotates along the cam surface 23c of the arm 23a of the interlocking ring, so the diaphragm blades operate and the diaphragm changes when the aperture is opened. The aperture is regulated according to zooming, and the amount of light incident on a light-receiving element (not shown) changes, and accordingly, the deflection of the meter pointer of the exposure meter also changes. At this time, the preset cam ring 18 also moves together with the movable cylinder 5, and its arm 18c
Since the upper pin 18b rotates along the cam groove 21b of the arm 21a of the preset ring, the cam surface 18a of the cam ring
The bell crank lever 19 is
rotates, and the position of the pin 19b relative to the protrusion 17c of the aperture operating ring 17a is corrected in accordance with changes in the aperture diameter due to the abutment between the aperture operating ring 17a and the pin 19b. When the aperture operation ring 22 is rotated in this state, the preset member 21 rotates as a unit, and the arm 21c transmits the rotation to the exposure meter in the camera, and the preset cam ring 18 is transmitted via the cam groove 21b and the pin 18b. The appropriate aperture value is preset according to the exposure meter's instructions. Next, in conjunction with the shutter release operation of the camera, the aperture drive lever pushes the arm 23b of the interlocking ring 23 against the spring 24 and moves it a certain amount, and the aperture operation ring 17a is pulled by the spring 20 and moves in the aperture direction. The aperture diameter is determined at the position where the engaging portion 17b contacts the pin 19b. The signal means 27 shown in FIG. 5 changes the aperture opening aperture as described above and corrects the preset position accordingly by rotating the zoom operation ring 10, and also by rotating the cam plate 26. The signal means 27 in contact with this moves in the optical axis direction. The cam surface 26a is designed so that the amount of protrusion of the signal means 27 changes in accordance with the error in the amount of light received by the light receiving element depending on the open aperture. When the aperture operation ring is operated, an appropriate aperture value is preset with the light reception error corrected.
以上のように本発明はズームレンズのズーミングによつ
てズームレンズ内の絞り装置が光軸に沿つて移動し絞り
口径又は絞り口径比が変化しカメラ側の露出計に入力す
るレンズ側の開放絞り値情報を補正する場合に、ズーミ
ング操作に応じて前記レンズの鏡胴後端に設けた信号手
段27を光軸に沿つて可動に構成し、信号手段27の移
動量L1〜L2を前記カム板26のカム26aによつて
ズーミングに応じて変化させ、該信号手段27を不図示
のカメラ側の露出計に連動させてレンズ側の開放絞り値
情報を伝達するものであり、ズーミングに応じたレンズ
側の情報を確実にカメラ側に伝達することができる。As described above, in the present invention, when the zoom lens is zoomed, the aperture device inside the zoom lens moves along the optical axis, and the aperture aperture or aperture ratio changes, and the maximum aperture on the lens side is inputted to the exposure meter on the camera side. When correcting value information, the signal means 27 provided at the rear end of the lens barrel is configured to be movable along the optical axis in response to a zooming operation, and the amount of movement L1 to L2 of the signal means 27 is adjusted by the amount of movement L1 to L2 on the cam plate. The aperture value is changed according to zooming by the cam 26a of 26, and the signal means 27 is linked to an exposure meter on the camera side (not shown) to transmit information on the aperture value on the lens side. information can be reliably transmitted to the camera side.
第1図乃至第5図は本発明の実施例を示し第1図は本発
明実施例のレンズ構体の要部断面図、第2図は第1図の
A−X断面矢視図、第3図は第2図のB−汀矢視展開図
、第4図は第2図のC−C′矢視展開図、第5図はレン
ズ側の信号手段27の具体的構成例を示す断面図、第6
図は第5図のカム板の斜視図である。
1・・・・・・鏡胴固定部、2・・・・・・締付リング
、3・・・・・・摺動案内筒、4,5・・・・・・移動
筒、10・・・・・・ズーム操作環、11・・・・・・
カム筒、12・・・・・ルンズ保持枠、14・・・・・
・距離操作環、17・・・・・・絞りユニツト、18・
・・・・・プリセツトカム、21・・・・・・プリセツ
ト部材、22・・・・・・絞り操作環、23・・・・・
・連動部材、26・・・・・・カム板、27・・・・・
・信号手段、I・・・・・・第1レンズ群、・・・・・
・第2レンズ群。1 to 5 show embodiments of the present invention. FIG. 1 is a cross-sectional view of a main part of a lens structure according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line A-X in FIG. The figure is a developed view of FIG. 2 taken along line B, FIG. 4 is a developed view taken along line C-C' of FIG. 2, and FIG. , 6th
The figure is a perspective view of the cam plate of FIG. 5. 1... Lens barrel fixed part, 2... Tightening ring, 3... Sliding guide tube, 4, 5... Moving tube, 10... ...Zoom operation ring, 11...
Cam tube, 12... Luns holding frame, 14...
・Distance operation ring, 17... Aperture unit, 18.
...Preset cam, 21 ... Preset member, 22 ... Aperture operation ring, 23 ...
・Interlocking member, 26...Cam plate, 27...
・Signal means, I...First lens group,...
-Second lens group.
Claims (1)
せズーミングによる絞り装置の露出情報の補正信号を被
装着側に伝達するように構成したことを特徴とするズー
ムレンズ構体。[Claims] 1. A movable signal means is provided at the rear end of the lens barrel, and the amount of movement of the signal means is changed in accordance with a zooming operation to transmit a correction signal of exposure information of an aperture device due to zooming to the attached side. A zoom lens structure characterized by being configured as follows.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2493481A JPS5944611B2 (en) | 1981-02-24 | 1981-02-24 | Zoom lens structure |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2493481A JPS5944611B2 (en) | 1981-02-24 | 1981-02-24 | Zoom lens structure |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6381072A Division JPS5640802B2 (en) | 1972-06-26 | 1972-06-26 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS56155908A JPS56155908A (en) | 1981-12-02 |
JPS5944611B2 true JPS5944611B2 (en) | 1984-10-31 |
Family
ID=12151906
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2493481A Expired JPS5944611B2 (en) | 1981-02-24 | 1981-02-24 | Zoom lens structure |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5944611B2 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4540262A (en) * | 1982-03-05 | 1985-09-10 | Minolta Camera | Camera accessory with data producer |
US4673275A (en) * | 1982-03-26 | 1987-06-16 | Minolta Camera Kabushiki Kaisha | Camera system operable by carrying data from a camera accessory to a camera body |
US4560267A (en) * | 1982-03-26 | 1985-12-24 | Minolta Camera Kabushiki Kaisha | Camera system operable by carrying data from a camera accessory to a camera body |
US4912498A (en) * | 1982-03-26 | 1990-03-27 | Minolta Camera Kabushiki Kaisha | Camera system capable of interchanging its objective lens |
US5311245A (en) * | 1982-03-26 | 1994-05-10 | Minolta Camera Kabushiki Kaisha | Camera system operable by carrying data from a camera accessory to a camera body |
JPH077172B2 (en) * | 1985-01-14 | 1995-01-30 | ミノルタ株式会社 | Aperture setting device |
-
1981
- 1981-02-24 JP JP2493481A patent/JPS5944611B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS56155908A (en) | 1981-12-02 |
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