JP3141550B2 - Zoom lens - Google Patents
Zoom lensInfo
- Publication number
- JP3141550B2 JP3141550B2 JP04204491A JP20449192A JP3141550B2 JP 3141550 B2 JP3141550 B2 JP 3141550B2 JP 04204491 A JP04204491 A JP 04204491A JP 20449192 A JP20449192 A JP 20449192A JP 3141550 B2 JP3141550 B2 JP 3141550B2
- Authority
- JP
- Japan
- Prior art keywords
- zoom
- lens
- aperture stop
- zooming
- group
- 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 - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Lenses (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明はテレビカメラ、ビデオカ
メラ、写真用カメラ等に好適なズームレンズに関し、特
に開口絞りの光軸上の位置を変倍に伴い一定の条件下で
移動させることにより、変倍に伴う収差変動、例えば望
遠側における絞り径による倍率色収差の変動を抑制し、
全変倍範囲にわたり高い光学性能を有したＦ１．８、変
倍比１８．３の大口径比、高変倍比のズームレンズに関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom lens suitable for a television camera, a video camera, a photographic camera and the like, and more particularly to a zoom lens by moving a position of an aperture stop on an optical axis under a constant condition with zooming. Aberration fluctuation due to zooming, for example, to suppress fluctuation of lateral chromatic aberration due to the aperture diameter on the telephoto side,
The present invention relates to a zoom lens having high optical performance over the entire zoom range, F1.8, a large aperture ratio of 18.3, and a high zoom ratio.
【０００２】[0002]
【従来の技術】従来よりテレビカメラ等のズームレンズ
にはテレビカメラの小型化に伴い、レンズ系全体が小型
でしかも大口径比で高変倍比のものが要望されている。2. Description of the Related Art Conventionally, zoom lenses for television cameras and the like have been required to have a small lens system, a large aperture ratio, and a high zoom ratio in accordance with the miniaturization of television cameras.
【０００３】ズームレンズのうち物体側から順に合焦用
の正の屈折力の第１群（合焦レンズ群）、変倍用の負の
屈折力の第２群（変倍レンズ群）、変倍に伴って変動す
る像面を補正する為の正又は負の屈折力の第３群（補正
レンズ群）、開口絞り、そして結像用の正の屈折力の第
４群（リレーレンズ群）の４つのレンズ群より成る所謂
４群ズームレンズは比較的高変倍化及び大口径比化が容
易である為、テレビカメラに限らず各種のカメラに用い
られている。In the zoom lens, in order from the object side, a first group having a positive refractive power for focusing (focusing lens group), a second group having a negative refractive power for zooming (variable lens group), Third group of positive or negative refractive power for correcting an image plane that varies with magnification (correction lens group), aperture stop, and fourth group of positive refractive power for imaging (relay lens group) The so-called four-group zoom lens composed of the four lens groups described above is used for not only television cameras but also various other cameras because it is relatively easy to increase the magnification and increase the aperture ratio.
【０００４】４群ズームレンズのうち口径比１．４程
度、変倍比１２程度の大口径、高変倍の４群ズームレン
ズが、例えば特開昭５５−９５９２２号公報、特開昭５
９−７１０１５号公報等で提案されている。Among the four-group zoom lenses, a large-aperture, high-magnification four-group zoom lens having an aperture ratio of about 1.4 and a zoom ratio of about 12 is disclosed in, for example, JP-A-55-95922 and JP-A-5-95922.
It has been proposed in, for example, JP-A-9-71015.
【０００５】[0005]
【発明が解決しようとする課題】４群ズームレンズにお
いて、レンズ系全体の大きさを決定する一要因として、
前玉レンズ径の大きさがある。この前玉レンズ径の大き
さは多くの場合望遠端での開放Ｆナンバーと軸外光束に
よって決定される。In a four-unit zoom lens, one factor that determines the size of the entire lens system is as follows.
There is a size of the front lens diameter. The size of the front lens diameter is often determined by the open F number at the telephoto end and the off-axis light flux.
【０００６】望遠端における軸上光束に対する軸外光束
の比率、即ち周辺光量比は大きい方が望ましいが、周辺
光量比が大きくなると前玉レンズ径が増大してくる。こ
の為、実際には問題のない程度の周辺光量を制限して前
玉レンズ径の増大を防止している。It is desirable that the ratio of the off-axis light beam to the on-axis light beam at the telephoto end, that is, the peripheral light amount ratio be large. However, as the peripheral light amount ratio increases, the diameter of the front lens increases. For this reason, the peripheral light amount that does not actually cause a problem is limited to prevent an increase in the diameter of the front lens.
【０００７】望遠側において、周辺光量を制限すると、
軸外光束のうち下方光束が制限される為、軸外光束の開
口絞りの中心光線と光束の中心光線（主光線）とのずれ
が大きくなってくる。そうすると、軸外光束の主光線と
開口絞りの中心光線の光軸と交わる点が望遠端への変倍
に伴い物体側へ移動してくる。この結果、軸外光束に対
する収差変動が大きくなってくる。On the telephoto side, if the amount of peripheral light is limited,
Since the lower light beam among the off-axis light beams is restricted, the shift between the center light beam of the aperture stop of the off-axis light beam and the center light beam (principal light beam) of the light beam increases. Then, the point where the principal ray of the off-axis light beam and the optical axis of the central ray of the aperture stop intersect moves to the object side with zooming to the telephoto end. As a result, the fluctuation of the aberration with respect to the off-axis light flux increases.
【０００８】又、ズームレンズにおける収差補正の分担
としては変倍に伴い変動する収差を補正する変倍部（合
焦レンズ群、変倍レンズ群、補正レンズ群）と変倍に無
関係の収差を補正する固定部（リレーレンズ群）とに分
けられる。The zoom lens is responsible for aberration correction by a zooming unit (focusing lens group, zooming lens group, correction lens group) for correcting aberrations that fluctuate with zooming, and aberrations unrelated to zooming. It is divided into a fixed part (relay lens group) for correction.
【０００９】変倍に伴い変動する収差として、例えば倍
率色収差は主に合焦レンズ群から発生してくる。これは
基本的にズームレンズの開口絞りが変倍部の後方（像面
側）に配置されている為、入射瞳の位置が望遠端への変
倍に伴い後方に移動し、合焦レンズ群から離れてきて、
主光線の合焦レンズ群への入射高が高くなってくる。こ
の為、主光線の入射高に依存する倍率色収差の発生量が
大きくなってくる。このとき合焦レンズ群で発生した倍
率色収差は変倍部で拡大されてリレーレンズ群に入射す
る。For example, magnification chromatic aberration, which varies as the magnification changes, mainly occurs from the focusing lens group. This basically since the aperture stop of the zoom lens is arranged behind the magnification unit (image surface side), the position of the entrance pupil is moved rearward had accompanied the zooming to the telephoto end, a focusing lens Come away from the group,
The incident height of the chief ray to the focusing lens group increases. For this reason, the amount of chromatic aberration of magnification depending on the incident height of the principal ray increases. At this time, the chromatic aberration of magnification generated in the focusing lens group is magnified by the variable power unit and enters the relay lens group.
【００１０】一般にこのときの変動する倍率色収差を固
定のリレーレンズ群で補正するのは大変難しく、光学性
能が大きく低下してくるという問題点があった。In general, it is very difficult to correct the fluctuating chromatic aberration at this time with a fixed relay lens group, and there is a problem that the optical performance is greatly reduced.
【００１１】又、従来の４群ズームレンズで開口絞りの
絞り径を小さくしていくと上方光束が先に遮られ、この
結果主光線は下方に変位し、合焦レンズ群を通過する主
光線の入射高が高くなってくる。When the aperture diameter of the aperture stop is reduced by the conventional four-group zoom lens, the upper light beam is blocked first, and as a result, the principal ray is displaced downward, and the principal ray passing through the focusing lens group. Incident height becomes higher.
【００１２】この為、望遠側においては開口絞りの絞り
径によって倍率色収差が変化してきてしまうという問題
点があった。For this reason, on the telephoto side, there is a problem that the chromatic aberration of magnification changes depending on the diameter of the aperture stop.
【００１３】倍率色収差を補正する方法として、レンズ
の材質に異常分散ガラスを用いるのが有効であるが、こ
の方法は他の諸収差の補正が難しくなり、全変倍範囲に
わたり高い光学性能を得るのが難しいという問題点があ
る。As a method of correcting chromatic aberration of magnification, it is effective to use anomalous dispersion glass as a lens material. However, this method makes it difficult to correct other aberrations and obtains high optical performance over the entire zoom range. There is a problem that it is difficult.
【００１４】本発明は所謂４群ズームレンズにおいて、
変倍に伴い変動し、又開口絞りの絞り径によって変動す
る諸収差、例えば倍率色収差の変動を開口絞りを変倍に
伴い所定の条件で光軸上移動させることにより良好に補
正し、全変倍範囲にわたり、又全絞り値において高い光
学性能を有したズームレンズの提供を目的とする。The present invention relates to a so-called four-group zoom lens,
Various aberrations, such as chromatic aberration of magnification, which fluctuate with the magnification and fluctuate with the aperture diameter of the aperture stop, are well corrected by moving the aperture stop on the optical axis under predetermined conditions with the magnification change, and the entire variation is obtained. It is an object of the present invention to provide a zoom lens having high optical performance over a double range and at all aperture values.
【００１５】[0015]
【課題を解決するための手段】本発明のズームレンズは
物体側より順に合焦用の正の屈折力の第１群、変倍用の
負の屈折力の第２群、変倍に伴う像面変動を補正する正
の屈折力の第３群、開口絞り、そして変倍中固定の結像
作用を有する第４群とを有したズームレンズにおいて、
ズーム比をＺとし、望遠側への変倍時に、前記開口絞り
は、広角端からＺ 1/4 に相当するズーム位置において固
定であり、Ｚ 1/4 に相当するズーム位置から望遠端にお
いて物体側に移動し、Ｚ 1/4 に相当するズーム位置にお
ける前記開口絞りの位置を基準として、Ｚ 1/4 に相当す
るズーム位置からＺ 1/2 に相当するズーム位置までの前
記開口絞りの移動量をＶ b ，Ｚ 1/4 に相当するズーム位置
から望遠端までの前記開口絞りの移動量をＶ T としたと
き、 Ｖb≦ＶT／５ なる条件を満足することを特徴とするA zoom lens according to the present invention comprises, in order from the object side, a first group of positive refractive power for focusing, a second group of negative refractive power for zooming, and an image associated with zooming. In a zoom lens having a third unit having a positive refractive power for correcting a surface variation, an aperture stop, and a fourth unit having a fixed imaging function during zooming,
When the zoom ratio is Z, and when zooming to the telephoto side, the aperture stop
Is fixed at the zoom position equivalent to Z 1/4 from the wide-angle end.
From the zoom position corresponding to Z 1/4 to the telephoto end.
Move to the object side, and move to the zoom position equivalent to Z 1/4 .
Z 1/4 based on the position of the aperture stop
From the zoom position to the zoom position equivalent to Z1 / 2
Zoom position corresponding to the moving amount of the aperture stop corresponding to V b , Z 1/4
And the amount of movement of the aperture stop to the telephoto end was V T from
And the condition Vb ≦ VT / 5 is satisfied.
【００１６】[0016]
【実施例】図１（Ａ）、（Ｂ）は本発明の数値実施例１
の広角端と望遠端のレンズ断面図である。1A and 1B show a numerical example 1 of the present invention.
3 is a lens cross-sectional view at a wide-angle end and a telephoto end of FIG.
【００１７】図中Ｌ１は合焦用の正の屈折力の第１群
（合焦レンズ群）、Ｌ２は広角端から望遠端への変倍の
際、像面側へ単調移動する変倍用の負の屈折力の第２群
（変倍部）、Ｌ３は変倍に伴い変動する像面を一定位置
に維持する為に広角端から望遠端にかけて物体側に非直
線的に移動する正の屈折力の第３群（補正レンズ群）、
Ｌ４は固定の結像作用をする正の屈折力の第４群（リレ
ーレンズ群）、ＳＰは開口絞りであり、第３群と第４群
との間に配置されており、変倍に伴い所定の条件下で移
動している。矢印ＳＰａは開口絞りＳＰの広角端から望
遠端への変倍に伴い移動する移動軌跡を示している。In the drawing, L1 is a first lens unit (focusing lens group) having a positive refractive power for focusing, and L2 is a zoom lens which moves monotonously to the image plane side when zooming from the wide-angle end to the telephoto end. A second lens unit (magnification unit) having a negative refractive power, L3 is a positive lens which moves non-linearly to the object side from the wide-angle end to the telephoto end in order to maintain an image plane that fluctuates with magnification at a fixed position. Third group of refractive power (correction lens group),
L4 is a fourth group (relay lens group) having a positive refractive power that performs a fixed image-forming action, and SP is an aperture stop, which is arranged between the third and fourth groups. Moving under certain conditions. An arrow SPa indicates a moving trajectory that moves as the magnification of the aperture stop SP changes from the wide-angle end to the telephoto end.
【００１８】Ｇは色分解用プリズムやフィルター等のガ
ラスブロックである。第１群Ｌ１、第２群Ｌ２、第３群
Ｌ３で変倍系を構成している。G is a glass block such as a color separation prism and a filter. The first unit L1, the second unit L2, and the third unit L3 constitute a variable power system.
【００１９】図２は本実施例において開口絞りＳＰが変
倍と共に移動する状態を示した説明図である。図中、横
軸にズーム位置、縦軸に移動量を示している。同図では
物体側への移動を正として示している。FIG. 2 is an explanatory view showing a state in which the aperture stop SP moves with zooming in this embodiment. In the figure, the horizontal axis indicates the zoom position, and the vertical axis indicates the amount of movement. In the figure, the movement to the object side is shown as positive.
【００２０】後述する数値実施例１では焦点距離１２．
５〜２２８．９５でズーム比Ｚ＝１８．３、開口絞りの
広角端から望遠端への変倍に伴う最大移動量ＶT ＝２５
である。In Numerical Example 1 described later, the focal length is 12.
The zoom ratio Z = 18.3 at the range of 5 to 228.95, and the maximum movement amount V T = 25 for zooming the aperture stop from the wide-angle end to the telephoto end
It is.
【００２１】本実施例では図１、図２に示すように、開
口絞りを広角端から所定のズーム位置までは固定とし、
所定のズーム位置から望遠端への変倍に際して前方（物
体側）へ移動させている。そして光束の中心光線の光軸
との交点近傍に開口絞りが位置するようにしている。In this embodiment, as shown in FIGS. 1 and 2, the aperture stop is fixed from the wide-angle end to a predetermined zoom position.
When zooming from a predetermined zoom position to the telephoto end, the zoom lens is moved forward (object side). The aperture stop is located near the intersection of the central ray of the light beam with the optical axis.
【００２２】具体的には広角端から望遠端への変倍に際
して、第３群が物体側へ移動するのに対応させて、その
とき生じる空間を利用し、広角端からＺ 1/4 に相当する
ズーム位置（ｆ＝２６）までは固定とし、Ｚ 1/4 に相当
するズーム位置（ｆ＝２６）より望遠端にかけて開口絞
りを物体側へ移動させている。[0022] Specifically, upon zooming to the telephoto end from the wide angle end, the third group so as to correspond to move toward the object side, using a space formed at that time, considerable angle end to Z 1/4 Do
Fixed up to zoom position (f = 26) , equivalent to Z 1/4
The aperture stop is moved to the object side from the zoom position (f = 26) to the telephoto end.
【００２３】このときＺ 1/4 に相当するズーム位置（ｆ
＝２６）からＺ 1/2 に相当するズーム位置（ｆ＝５４）
までは移動量Ｖbが全移動量ＶT（２５）に対して前述の
如くＶb ≦ＶT ／５となるように少なく移動させてい
る。そしてＺ 1/2 に相当するズーム位置（ｆ＝５４）か
ら望遠端（ズーム比Ｚ、ｆ＝２２８．９５）にかけては
曲線的に大きく移動させている。At this time , the zoom position (f) corresponding to Z 1/4
= 26) to the zoom position corresponding to Z 1/2 (f = 54)
Up to this point, the moving amount Vb is moved less than the total moving amount V T (25) so that V b ≦ V T / 5. And are curved manner is greatly moved zoom position corresponding to Z 1/2 from (f = 54) to the telephoto end (zoom ratio Z, f = 228.95).
【００２４】そして最終的に開口絞りＳＰが広角端に比
べて望遠端で物体側に位置するようにしている。これに
より開口絞りを絞り込んだとき軸外光束のうち下方光束
が遮られるようにし、合焦レンズ群を通過する主光線の
光軸からの高さが低くなるようにして合焦レンズ群から
の倍率色収差の発生量を少なくしている。Finally, the aperture stop SP is located closer to the object side at the telephoto end than at the wide-angle end. Thus, when the aperture stop is stopped down, the lower beam among the off-axis beams is blocked, and the height of the principal ray passing through the focusing lens unit from the optical axis is reduced so that the magnification from the focusing lens unit is reduced. The amount of occurrence of chromatic aberration is reduced.
【００２５】本実施例ではこのような構成により開口絞
りを絞り込んだときの収差変動を少なくし、特に倍率色
収差の変動を少なくし、例えばテレビカメラ等に用いた
ときのレジストレーションエラーを少なくすると共に全
変倍範囲にわたり高い光学性能を得ている。In this embodiment, with such a configuration, variation in aberration when the aperture stop is stopped down is reduced, and especially, variation in chromatic aberration of magnification is reduced. For example, a registration error when used in a television camera or the like is reduced. High optical performance is obtained over the entire zoom range.
【００２６】本実施例のズームレンズでは所定のズーム
位置から望遠端への変倍に際して開口絞りを物体側へ移
動させてる為の空間を確保する為に広角端から望遠端へ
の変倍に際して第３群が前方へ移動するようなズームタ
イプとなるように、前述の如く各レンズ群の屈折力を設
定している。In the zoom lens according to the present embodiment, in order to secure a space for moving the aperture stop toward the object side at the time of zooming from a predetermined zoom position to the telephoto end, the zoom lens must be zoomed from the wide-angle end to the telephoto end. As described above, the refractive power of each lens group is set so as to be a zoom type in which the three groups move forward.
【００２７】図３、図４は数値実施例１の望遠端におけ
るＦナンバーがＦ２．２（開放）と、Ｆ５．６のときの
収差図である。3 and 4 are aberration diagrams of the numerical example 1 when the F-number at the telephoto end is F2.2 (open) and F5.6.
【００２８】本実施例のズームレンズは絞り中心と主光
線が略一致するように開口絞りを移動させている為に開
放時とＦ５．６の双方で絞り径によらず倍率色収差が良
好に補正されている。In the zoom lens according to the present embodiment, since the aperture stop is moved so that the center of the stop and the principal ray substantially coincide with each other, the chromatic aberration of magnification is favorably corrected both at the time of opening and at F5.6 regardless of the stop diameter. Have been.
【００２９】本発明において変倍に伴い開口絞りを前方
に移動させたときＦナンバーを決定する光束と軸外光束
の各レンズ群への入射高が変化するので、それに伴い絞
り径を変化させるのが良い。このときの絞り径の変化
は、例えばオートアイリス機構等を用いて行うのが良
い。In the present invention, when the aperture stop is moved forward with zooming, the incident height of the light beam for determining the F-number and the off-axis light beam to each lens group changes, so that the stop diameter is changed accordingly. Is good. The change in the aperture diameter at this time is preferably performed using, for example, an auto iris mechanism.
【００３０】又、開口絞りを前方に移動させたときの射
出瞳の変動を少なくする為にズームレンズを射出瞳の位
置が広角端でマイナス方向（前方）となり、望遠端でプ
ラス方向（後方）となるようなテレセントリック系より
構成している。これにより例えばテレビカメラ等に用い
たときのカラーシェーディングの発生量を少なくしてい
る。In order to reduce the fluctuation of the exit pupil when the aperture stop is moved forward, the position of the exit pupil of the zoom lens is set in the minus direction (front) at the wide-angle end and in the plus direction (rear) at the telephoto end. It is composed of a telecentric system as follows. This reduces the amount of color shading when used in, for example, a television camera.
【００３１】次に本発明の数値実施例を示す。数値実施
例においてＲｉは物体側より順に第ｉ番目のレンズ面の
曲率半径、Ｄｉは物体側より第ｉ番目のレンズ厚及び空
気間隔、Ｎｉとνｉは各々物体側より順に第ｉ番目のレ
ンズのガラスの屈折率とアッベ数である。Ｒ４６、Ｒ４
７は色分解プリズムや色フィルター等のガラスブロック
である。Next, numerical examples of the present invention will be described. In the numerical examples, Ri is the radius of curvature of the i-th lens surface in order from the object side, Di is the i-th lens thickness and air spacing from the object side, and Ni and νi are the i-th lens surfaces in order from the object side. The refractive index and Abbe number of glass. R46, R4
Reference numeral 7 denotes a glass block such as a color separation prism and a color filter.
【００３２】 数値実施例１ F=12.5〜228.95 FNO=1:2.2〜5.6 2ω=65.2 〜4.0 R 1= 2455.41 D 1= 5.40 N 1=1.69979 ν 1= 55.5 R 2= 271.91 D 2= 28.94 R 3= -267.58 D 3= 3.00 N 2=1.69979 ν 2= 55.5 R 4= -2503.19 D 4= 1.98 R 5= 9738.25 D 5= 3.00 N 3=1.64254 ν 3= 60.1 R 6= 224.83 D 6= 14.59 N 4=1.76168 ν 4= 27.5 R 7= 1879.70 D 7= 1.84 R 8= 1282.45 D 8= 13.52 N 5=1.62287 ν 5= 60.3 R 9= -242.57 D 9= 0.30 R10= 1074.61 D10= 4.50 N 6=1.81265 ν 6= 25.4 R11= 150.07 D11= 20.80 N 7=1.48915 ν 7= 70.2 R12= -401.90 D12= 0.30 R13= 160.26 D13= 16.10 N 8=1.48915 ν 8= 70.2 R14= 45982.92 D14= 0.30 R15= 148.13 D15= 12.92 N 9=1.62287 ν 9= 60.3 R16= 512.54 D16= 可変 R17= 95.44 D17= 2.40 N 10=1.77621 ν 10= 49.6 R18= 42.25 D18= 9.16 R19= -1689.53 D19= 2.20 N 11=1.77621 ν 11= 49.6 R20= 84.69 D20= 11.71 R21= -46.36 D21= 2.20 N 12=1.77621 ν 12= 49.6 R22= 779.13 D22= 5.58 N 13=1.93306 ν 13= 21.3 R23= -92.60 D23= 可変 R24= 1110.01 D24= 8.90 N 14=1.48915 ν 14= 70.2 R25= -82.86 D25= 0.30 R26= 325.37 D26= 12.18 N 15=1.64254 ν 15= 60.1 R27= -71.86 D27= 2.40 N 16=1.81265 ν 16= 25.4 R28= -222.32 D28= 0.30 R29= 84.97 D29= 9.95 N 17=1.48915 ν 17= 70.2 R30= -1089.44 D30= 可変 R31=(絞り) D31= 可変 R32= -47.08 D32= 1.40 N 18=1.62032 ν 18= 63.4 R33= 39.65 D33= 5.94 N 19=1.81265 ν 19= 25.4 R34= 65.31 D34= 9.57 R35= -38.40 D35= 1.50 N 20=1.64254 ν 20= 60.1 R36= -1105.33 D36= 9.77 N 21=1.69417 ν 21= 31.1 R37= -38.03 D37= 13.00 R38= 73.63 D38= 12.37 N 22=1.49845 ν 22= 81.6 R39= -88.22 D39= 0.20 R40= -3325.75 D40= 2.00 N 23=1.85501 ν 23= 23.9 R41= 56.24 D41= 2.72 R42= 105.85 D42= 8.04 N 24=1.45720 ν 24= 90.3 R43= -70.51 D43= 1.10 R44= 50.76 D44= 8.23 N 25=1.43985 ν 25= 95.0 R45= -3158.30 D45= 8.30 R46= ∞ D46= 69.20 N 26=1.51825 ν 26= 64.2 R47= ∞Numerical Example 1 F = 12.5 to 228.95 FNO = 1: 2.2 to 5.6 2ω = 65.2 to 4.0 R 1 = 2455.41 D 1 = 5.40 N 1 = 1.69979 ν 1 = 55.5 R 2 = 271.91 D 2 = 28.94 R 3 = -267.58 D 3 = 3.00 N 2 = 1.69979 ν 2 = 55.5 R 4 = -2503.19 D 4 = 1.98 R 5 = 9738.25 D 5 = 3.00 N 3 = 1.64254 ν 3 = 60.1 R 6 = 224.83 D 6 = 14.59 N 4 = 1.76168 ν 4 = 27.5 R 7 = 1879.70 D 7 = 1.84 R 8 = 1282.45 D 8 = 13.52 N 5 = 1.62287 ν 5 = 60.3 R 9 = -242.57 D 9 = 0.30 R10 = 1074.61 D10 = 4.50 N 6 = 1.81265 ν 6 = 25.4 R11 = 150.07 D11 = 20.80 N 7 = 1.48915 ν 7 = 70.2 R12 = -401.90 D12 = 0.30 R13 = 160.26 D13 = 16.10 N 8 = 1.48915 ν 8 = 70.2 R14 = 45982.92 D14 = 0.30 R15 = 148.13 D15 = 12.92 N 9 = 1.62287 ν 9 = 60.3 R16 = 512.54 D16 = Variable R17 = 95.44 D17 = 2.40 N 10 = 1.77621 ν 10 = 49.6 R18 = 42.25 D18 = 9.16 R19 = -1689.53 D19 = 2.20 N 11 = 1.77621 ν 11 = 49.6 R20 = 84.69 D20 = 11.71 R21 = -46.36 D21 = 2.20 N 12 = 1.77621 ν 12 = 49.6 R22 = 779.13 D22 = 5.58 N 13 = 1.93306 ν 13 = 21.3 R23 = -92.60 D23 = Variable R24 = 1110.01 D24 = 8.90 N 14 = 1.48915 ν 14 = 70.2 R25 = -82.86 D25 = 0.30 R26 = 325. 37 D26 = 12.18 N 15 = 1.64254 ν 15 = 60.1 R27 = -71.86 D27 = 2.40 N 16 = 1.81265 ν 16 = 25.4 R28 = -222.32 D28 = 0.30 R29 = 84.97 D29 = 9.95 N 17 = 1.48915 ν 17 = 70.2 R30 = -1089.44 D30 = Variable R31 = (Aperture) D31 = Variable R32 = -47.08 D32 = 1.40 N 18 = 1.62032 ν 18 = 63.4 R33 = 39.65 D33 = 5.94 N 19 = 1.81265 ν 19 = 25.4 R34 = 65.31 D34 = 9.57 R35 = -38.40 D35 = 1.50 N 20 = 1.64254 ν 20 = 60.1 R36 = -1105.33 D36 = 9.77 N 21 = 1.69417 ν 21 = 31.1 R37 = -38.03 D37 = 13.00 R38 = 73.63 D38 = 12.37 N 22 = 1.49845 ν 22 = 81.6 R39 = -88.22 D39 = 0.20 R40 = -3325.75 D40 = 2.00 N 23 = 1.85501 ν 23 = 23.9 R41 = 56.24 D41 = 2.72 R42 = 105.85 D42 = 8.04 N 24 = 1.45720 ν 24 = 90.3 R43 = -70.51 D43 = 1.10 R44 = 50.76 D44 = 8.23 N 25 = 1.43985 ν 25 = 95.0 R45 = -3158.30 D45 = 8.30 R46 = ∞ D46 = 69.20 N 26 = 1.51825 ν 26 = 64.2 R47 =
【００３３】[0033]
【表１】 [Table 1]
【００３４】[0034]
【発明の効果】本発明によれば以上のように、所謂４群
ズームレンズにおいて変倍に伴い変動し、又開口絞りの
絞り径によって変動する諸収差、例えば倍率色収差の変
動を開口絞りを変倍に伴い所定の条件で光軸上移動させ
ることにより良好に補正し、全変倍範囲にわたり、又全
絞り値において高い光学性能を有したズームレンズを達
成することができる。As described above, according to the present invention, in the so-called four-unit zoom lens, various aberrations that fluctuate with zooming and fluctuate depending on the aperture diameter of the aperture stop, for example, fluctuations in chromatic aberration of magnification are changed by changing the aperture stop. It is possible to achieve a zoom lens having high optical performance over the entire zoom range and at all aperture values by performing good correction by moving on the optical axis under predetermined conditions with magnification.
【図１】本発明の数値実施例１のレンズ断面図FIG. 1 is a sectional view of a lens according to a numerical example 1 of the present invention.
【図２】本発明に係る開口絞りの移動状態を表わす説明
図FIG. 2 is an explanatory diagram showing a moving state of an aperture stop according to the present invention.
【図３】本発明の数値実施例１のＦ２．２の横収差図FIG. 3 is a lateral aberration diagram of F2.2 in Numerical Example 1 of the present invention.
【図４】本発明の数値実施例１のＦ２．２の縦収差図FIG. 4 is a longitudinal aberration diagram of F2.2 in Numerical Example 1 of the present invention.
【図５】本発明の数値実施例１のＦ５．６の横収差図FIG. 5 is a lateral aberration diagram of F5.6 in Numerical Example 1 of the present invention.
【図６】本発明の数値実施例１のＦ５．６の縦収差図FIG. 6 is a longitudinal aberration diagram of F5.6 according to Numerical Embodiment 1 of the present invention.
Ｌ１ 第１群 Ｌ２ 第２群 Ｌ３ 第３群 Ｌ４ 第４群 ＳＰ 開口絞り ｄ ｄ線 ｇ ｇ線 Ｓ サジタル像面 Ｍ メリディオナル像面 Ｙ 像高 L1 First unit L2 Second unit L3 Third unit L4 Fourth unit SP Aperture stop d d-line g g-line S Sagittal image plane M Meridional image plane Y Image height
Claims (2)
１群、 変倍用の負の屈折力の第２群、 変倍に伴う像面変動を補正する正の屈折力の第３群、 開口絞り、そして変倍中固定の結像作用を有する第４群
とを有したズームレンズにおいて、ズーム比をＺとし、望遠側への変倍時に、前記開口絞り
は、広角端からＺ 1/4 に相当するズーム位置において固
定であり、Ｚ 1/4 に相当するズーム位置から望遠端にお
いて物体側に移動し、 Ｚ 1/4 に相当するズーム位置における前記開口絞りの位
置を基準として、Ｚ 1/4 に相当するズーム位置からＺ 1/2
に相当するズーム位置までの前記開口絞りの移動量をＶ
b ，Ｚ 1/4 に相当するズーム位置から望遠端までの前記開
口絞りの移動量をＶ T としたとき、 Ｖb≦ＶT／５ なる条件を満足することを特徴とするズームレンズ。1. A first lens unit having a positive refractive power for focusing, a second lens unit having a negative refractive power for zooming, and a positive lens having a positive refractive power for correcting an image plane variation caused by zooming in order from the object side. A zoom lens having a third group, an aperture stop, and a fourth group having a fixed image forming function during zooming, wherein the zoom ratio is Z, and when zooming to the telephoto side, the aperture stop is set.
Is fixed at the zoom position equivalent to Z 1/4 from the wide-angle end.
From the zoom position corresponding to Z 1/4 to the telephoto end.
And moves to the object side, and the position of the aperture stop at a zoom position corresponding to Z 1/4
Based on the location, Z 1/2 from the zoom position corresponding to Z 1/4
The amount of movement of the aperture stop up to the zoom position corresponding to
b , the opening from the zoom position corresponding to Z 1/4 to the telephoto end.
When the amount of movement of the mouth aperture was V T, the zoom lens satisfies the V b ≦ V T / 5 following condition.
角端でマイナス方向となり、望遠端でプラス方向となる
ようなテレセントリック系より構成していることを特徴
とする請求項１に記載のズームレンズ。Wherein said zoom lens becomes negative direction at the wide-angle end position of the exit pupil, zoom according to claim 1, characterized in that it is constituted by a telecentric system such that the positive direction at the telephoto end lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04204491A JP3141550B2 (en) | 1992-07-07 | 1992-07-07 | Zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04204491A JP3141550B2 (en) | 1992-07-07 | 1992-07-07 | Zoom lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0627380A JPH0627380A (en) | 1994-02-04 |
| JP3141550B2 true JP3141550B2 (en) | 2001-03-05 |
Family
ID=16491412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04204491A Expired - Fee Related JP3141550B2 (en) | 1992-07-07 | 1992-07-07 | Zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3141550B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000162501A (en) * | 1998-11-25 | 2000-06-16 | Tamron Co Ltd | Zoom lens |
| JP5540515B2 (en) * | 2009-01-30 | 2014-07-02 | 株式会社ニコン | Variable magnification optical system and optical apparatus having the variable magnification optical system |
| JP6003530B2 (en) * | 2012-10-25 | 2016-10-05 | リコーイメージング株式会社 | Zoom lens system |
-
1992
- 1992-07-07 JP JP04204491A patent/JP3141550B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0627380A (en) | 1994-02-04 |
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