JPH0933812A - Zoom lens - Google Patents
Zoom lensInfo
- Publication number
- JPH0933812A JPH0933812A JP7207756A JP20775695A JPH0933812A JP H0933812 A JPH0933812 A JP H0933812A JP 7207756 A JP7207756 A JP 7207756A JP 20775695 A JP20775695 A JP 20775695A JP H0933812 A JPH0933812 A JP H0933812A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- lens group
- group
- object side
- zoom
- 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
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
- G02B15/1441—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive
- G02B15/144109—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive arranged +--+
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、小型軽量で、大口
径、広画角、大ズーム比を持つ、シネマトグフィー等に
用いられる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 which is small and lightweight, has a large aperture, a wide angle of view, and a large zoom ratio and is used for cinema toggies and the like.
【０００２】[0002]
【発明が解決しようとする課題】従来より、大口径かつ
広画角かつ大ズーム比のズームレンズの多くのものは、
物体側より順に、正、負、負、正または正、負、正、正
の屈折力を有する４群構成であり、第２レンズ群及び第
３レンズ群を移動させることにより、ズーミングを行う
ことが知られている。近年、大口径で広画角、しかも大
ズーム比でありながら、小型軽量で、かつ高性能のズー
ムレンズに対する要望が更に強まっている。一般に、ズ
ームレンズの更なる小型軽量化、あるいは小型軽量を維
持しつつ、更なる高仕様化を図る手段として、各レンズ
群のパワーを強める方法が用いられているが、そのため
に諸収差が犠牲となり性能上の問題が発生する。この発
明は、かかる点に鑑みてなされたものであり、小型軽量
で、かつ高仕様で、かつ高性能なズームレンズを提供す
ることを課題とするものである。Conventionally, many zoom lenses having a large aperture, a wide angle of view and a large zoom ratio have been
A four-group structure having positive, negative, negative, positive or positive, negative, positive, positive refractive power in order from the object side, and zooming is performed by moving the second lens group and the third lens group. It has been known. In recent years, there has been an increasing demand for a compact, lightweight, and high-performance zoom lens having a large aperture, a wide angle of view, and a large zoom ratio. Generally, a method of strengthening the power of each lens group is used as a means of further increasing the specifications while further reducing the size and weight of the zoom lens, or maintaining the size and weight, but for that reason various aberrations are sacrificed. Will cause performance problems. The present invention has been made in view of the above points, and an object thereof is to provide a compact and lightweight zoom lens having high specifications and high performance.
【０００３】[0003]
【課題を解決するための手段】本発明は、物体側より順
に、ズーミング中固定で正屈折力を有する第１レンズ群
Ｇ1と、ズーミングに際し共に可動で共に負屈折力を有
する第２レンズ群Ｇ2及び第３レンズ群Ｇ3と、ズーミン
グ中固定で正屈折力を有する第４レンズ群Ｇ4とを有
し、広角端から望遠端へのズーミングに際して、第２レ
ンズ群Ｇ2は光軸に沿って物体側から像側に単調に移動
し、第３レンズ群Ｇ3は、広角端と望遠端との間の中間
位置までは光軸に沿って像側から物体側に移動し、中間
位置から望遠端までは光軸に沿って物体側から像側に移
動するズームレンズにおいて、第１レンズ群Ｇ1は少な
くとも４つのレンズ群からなり、第２レンズ群Ｇ2は少
なくとも４つのレンズ群からなり、第４レンズ群Ｇ4は
少なくとも６つのレンズ群からなり、且つ、 ０．７＜（ＦT）1/2・ｆ1／ｆT＜１．１ （１） １．１＜｜β2W・Ｖ1/2｜＜１．５ （２） Ａ4／Ｄ4＜０．１５ （３） なる各条件を満足することにより、上記課題を解決し
た。According to the present invention, in order from the object side, a first lens group G 1 having a fixed positive refractive power during zooming and a second lens group G 1 both movable during zooming and both having a negative refractive power are provided. and G 2 and the third lens group G 3, and a fourth lens group G 4 having a positive refractive power in zooming fixed during zooming from the wide-angle end to the telephoto end, the second lens group G 2 is the optical axis Along the optical axis from the object side to the image side, the third lens group G 3 moves from the image side to the object side along the optical axis up to the intermediate position between the wide-angle end and the telephoto end, In the zoom lens that moves from the object side to the image side along the optical axis from the position to the telephoto end, the first lens group G 1 includes at least four lens groups, and the second lens group G 2 includes at least four lens groups. made, the fourth lens group G 4 is at least six lenses Made, and, 0.7 <(F T) 1/2 · f 1 / f T <1.1 (1) 1.1 <| β 2W · V 1/2 | <1.5 (2) A The above problem was solved by satisfying each condition of 4 / D 4 <0.15 (3).
【０００４】但し、 ｆT：望遠端における全系の合成焦点距離 ＦT：望遠端におけるＦナンバー ｆ1：第１レンズ群Ｇ1の焦点距離 β2W：第２レンズ群Ｇ2の広角端における倍率 Ｖ：ズーム比 Ａ4：第４レンズ群Ｇ4中の最大空気間隔 Ｄ4：第４レンズ群Ｇ4のうち、最も物体側のレンズ面か
ら最も像側のレンズ面までの距離 である。However, f T : Composite focal length of the entire system at the telephoto end F T : F number at the telephoto end f 1 : Focal length of the first lens group G 1 β 2W : At the wide-angle end of the second lens group G 2 . magnification V: zoom ratio a 4: fourth lens group G 4 in the maximum air gap D 4 of: of the fourth lens group G 4, is the distance from the lens surface closest to the object side to the lens surface on the most image side.
【０００５】上記条件（１）は、結像性能を維持しつつ
ズームレンズの変倍部の小型化を図るために、変倍部の
最適なパワーを規定するものである。これにより、ズー
ムレンズのズーム比及び最大口径比による最適な変倍部
のパワー範囲を規定することができる。条件（１）の上
限を越える場合には、変倍部の小型化を達成することが
困難となる。また、下限を越える場合には、小型化には
効果的であるが、これに伴う諸収差の悪化が著しくな
る。特に、第２レンズ群Ｇ2と第３レンズ群Ｇ3のパワー
が強くなることによるペッツバール和の劣化を招き、ま
た第１レンズ群Ｇ1の望遠端における見掛けのＦナンバ
ーが小さくなり過ぎるために、望遠端での球面収差が補
正困難となる。そして、製造上の公差も厳しくなり、各
レンズの偏心による画質の劣化も著しくなってしまう。The condition (1) defines the optimum power of the zooming portion in order to downsize the zooming portion of the zoom lens while maintaining the imaging performance. With this, it is possible to define the optimum power range of the zooming unit according to the zoom ratio and the maximum aperture ratio of the zoom lens. If the upper limit of the condition (1) is exceeded, it will be difficult to achieve miniaturization of the variable power portion. On the other hand, when the value goes below the lower limit, it is effective for downsizing, but aggravation of various aberrations accompanying this is remarkable. In particular, the Petzval sum is deteriorated due to the stronger powers of the second lens group G 2 and the third lens group G 3 , and the apparent F number of the first lens group G 1 at the telephoto end becomes too small. , It becomes difficult to correct the spherical aberration at the telephoto end. Then, manufacturing tolerances become strict and deterioration of image quality due to decentering of each lens becomes remarkable.
【０００６】本発明においては、さらに、ペッツバール
和を良好に保つための条件（２）を課している。これに
より、条件（１）で変倍部の小型化を図っているにも拘
らず、比較的第２レンズ群Ｇ2のパワーを小さくして、
ペッツバール和の悪化を防止している。すなわち本発明
の如きタイプのズームレンズにおいては、第２レンズ群
Ｇ2のパワーが各レンズ群中最も強いため、第２レンズ
群Ｇ2の負のパワーをできるだけ弱くすることが、ペッ
ツバール和を適正な値に保つための最も効果的な方法で
ある。図７に第２レンズ群Ｇ2による変倍の様子を示し
た。同図中、Ｐは第１レンズ群Ｇ1による像点位置、す
なわち第２レンズ群Ｇ2に対する物点位置を示し、Ｑは
第２レンズ群Ｇ2によって形成される像点の軌跡を示
す。第２レンズ群Ｇ2による変倍率をｖとすると、第２
レンズ群Ｇ2の広角端及び望遠端での倍率を、それぞれ
−１／ｖ1/2及び−ｖ1/2になるような範囲Ｗ0−Ｔ0を基
準変倍域として選ぶと、像点Ｑの位置が広角端と望遠端
とで一致し、したがって第３レンズ群Ｇ3の位置も両端
で一致する。また、第２レンズ群Ｇ2の変倍率ｖはズー
ム比Ｖに等しくなる。第１レンズ群Ｇ1と第２レンズ群
Ｇ2が最も接近する広角端において、各レンズ群が機械
的に干渉するのを防ぐために必要な空間をΔとすると、
広角端における第２レンズ群Ｇ2の倍率β2Wとその焦点
距離ｆ2との間に、 ｆ2＝（ｆ1−Δ）・β2W／（１−β2W） なる関係がある。In the present invention, the condition (2) for keeping the Petzval sum in good condition is further imposed. As a result, the power of the second lens group G 2 can be made relatively small in spite of the miniaturization of the variable power portion under the condition (1).
It prevents the deterioration of Petzval sum. That is, in the zoom lens of the type according to the present invention, since the power of the second lens group G 2 is the strongest among the lens groups, it is appropriate to make the negative power of the second lens group G 2 as weak as possible for the Petzval sum. Is the most effective way to keep the value. FIG. 7 shows the manner of zooming by the second lens group G 2 . In FIG, P is the image point position of the first lens group G 1, i.e., shows the object point position on the second lens group G 2, Q denotes the trajectory of the image point formed by the second lens group G 2. When the magnification ratio of the second lens group G 2 and v, second
The wide-angle end of the lens group G 2 and the magnification at the telephoto end, choose the range W 0 -T 0 as each becomes -1 / v 1/2 and -v 1/2 based zoom range, the image point The position of Q coincides with the wide-angle end and the telephoto end, and therefore the position of the third lens group G 3 also coincides with both ends. Further, the magnification ratio v of the second lens group G 2 becomes equal to the zoom ratio V. At the wide-angle end where the first lens group G 1 and the second lens group G 2 are closest to each other, Δ is a space required to prevent mechanical interference between the lens groups.
There is a relationship of f 2 = (f 1 −Δ) · β 2W / (1−β 2W ) between the magnification β 2W of the second lens group G 2 and its focal length f 2 at the wide-angle end.
【０００７】この式より明らかに、β2Wを−１／Ｖ1/2
よりも大きくすれば｜ｆ2｜は大きくなり、第２レンズ
群Ｇ2のパワーは弱くなる。これは図７中では、第２レ
ンズ群Ｇ2の変倍域として、基準変倍域Ｗ0−Ｔ0よりも
下側の領域Ｗ−Ｔを選ぶことに相当する。本発明では、
第２レンズ群Ｇ2の変倍域を条件（２）で規定される領
域に限定している。条件（２）の下限を越える場合に
は、第２レンズ群Ｇ2のパワーが強くなり、ペッツバー
ル和の悪化を免れない。上限を越える場合には、第２レ
ンズ群Ｇ2の変倍に必要な可動スペースが大きくなり、
レンズ系の全長及び前玉径が増大してしまう。また、望
遠端の近傍において、ズーミング時の第２レンズ群Ｇ2
の移動量に対する第３レンズ群Ｇ3の移動量の比が極め
て大きくなり、両群を移動させるための鏡筒の機構に不
都合を生ずる。From this equation, it is clear that β 2W is -1 / V 1/2
If larger than that, | f 2 | becomes larger, and the power of the second lens group G 2 becomes weaker. This corresponds to selecting the area WT below the reference zoom area W 0 -T 0 as the zoom area of the second lens group G 2 in FIG. 7. In the present invention,
The variable power range of the second lens group G 2 is limited to the range defined by the condition (2). When the value goes below the lower limit of the condition (2), the power of the second lens group G 2 becomes strong, and the Petzval sum is unavoidably deteriorated. If the upper limit is exceeded, the movable space required for zooming the second lens group G 2 becomes large,
The total length of the lens system and the front lens diameter increase. Also, in the vicinity of the telephoto end, the second lens group G 2 during zooming
The ratio of the amount of movement of the third lens group G 3 to the amount of movement of the lens group becomes extremely large, which causes inconvenience in the mechanism of the lens barrel for moving both groups.
【０００８】また、本発明においては、大口径かつ大ズ
ーム比を有しながらも、高性能化を図るために、第１レ
ンズ群Ｇ1が少なくとも４つのレンズ群からなり、第２
レンズ群Ｇ2も少なくとも４つのレンズ群からなり、第
４レンズ群Ｇ4は少なくとも６つのレンズ群からなる構
成としている。また、結像部である第４レンズ群Ｇ4の
コンパクト化を図るために、条件（３）を課している。
条件（３）の上限を越える場合には、結像部の小型化を
達成することが困難となる。According to the present invention, the first lens group G 1 is composed of at least four lens groups in order to achieve high performance while having a large aperture and a large zoom ratio.
The lens group G 2 is also composed of at least four lens groups, and the fourth lens group G 4 is composed of at least six lens groups. Further, the condition (3) is imposed in order to make the fourth lens group G 4 which is the image forming unit compact.
When the value exceeds the upper limit of the condition (3), it becomes difficult to reduce the size of the image forming unit.
【０００９】また第４レンズ群Ｇ4としては、まず、第
３レンズ群Ｇ3から出射される強い発散光束を収束光束
に変換するために、物体側より順に、少なくとも３つの
正レンズ群Ｌ41、Ｌ42、Ｌ43を配置することが適切であ
り、続いて、補正不足の傾向になる球面収差を良好に補
正するために、１つの負レンズ群Ｌ44を配置し、続い
て、コマ収差を良好に補正するために、少なくとも２つ
の正レンズ群Ｌ45、Ｌ46を配置することが望ましい。そ
の際、少なくとも３つの正レンズ群Ｌ41、Ｌ42、Ｌ
43と、少なくとも２つの正レンズ群Ｌ45、Ｌ46のうち、
少なくとも２つの正レンズ群は、貼り合わせレンズであ
ることが望ましく、それによって、色収差の補正を図る
ことができ、またペッツバール和を適正な値に保持する
ことができる。また負レンズ群Ｌ44は、像側に強い凹面
を有するメニスカスレンズであることが望ましく、それ
によって、直前の正レンズ群からの収束光束を無理なく
受けることができ、収差補正上、有利である。As the fourth lens group G 4 , first, in order to convert the strong divergent light flux emitted from the third lens group G 3 into a convergent light flux, at least three positive lens groups L 41 are arranged in order from the object side. , L 42 , L 43 are appropriately arranged, and subsequently, in order to satisfactorily correct spherical aberration that tends to be undercorrected, one negative lens group L 44 is arranged, and subsequently, coma aberration is set. It is desirable to dispose at least two positive lens groups L 45 and L 46 in order to satisfactorily correct. At that time, at least three positive lens groups L 41 , L 42 , and L
43 and at least two positive lens groups L 45 and L 46 ,
At least two positive lens groups are desirably cemented lenses, whereby chromatic aberration can be corrected, and Petzval sum can be held at an appropriate value. The negative lens group L 44 is preferably a meniscus lens having a strong concave surface on the image side, whereby the convergent light flux from the immediately preceding positive lens group can be reasonably received, which is advantageous in aberration correction. .
【００１０】[0010]
【発明の実施の形態】以下、本発明の実施の形態につい
て説明する。図１、図３及び図５はそれぞれ第１、第２
及び第３実施例のレンズ構成図を示す。各実施例は、物
体側より順に、ズーミング中固定で正屈折力を有する第
１レンズ群Ｇ1と、ズーミングに際し可動で負屈折力を
有する第２レンズ群Ｇ2と、同じくズーミングに際し可
動で負屈折力を有する第３レンズ群Ｇ3と、ズーミング
中固定で正屈折力を有する第４レンズ群Ｇ4とからな
る。広角端から望遠端へのズーミングに際しては、第２
レンズ群Ｇ2は光軸に沿って物体側から像側に単調に移
動する。他方、第３レンズ群Ｇ3は、広角端と望遠端と
の間の中間位置までは、光軸に沿って像側から物体側に
移動し、中間位置から望遠端までは、光軸に沿って物体
側から像側に移動する。すなわち第３レンズ群Ｇ3は、
広角端から望遠端へのズーミングに際して、物体側に凸
を描くように往復動する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. 1, 3 and 5 are respectively the first and second
3A and 3B show a lens configuration diagram of a third embodiment. In each of the embodiments, in order from the object side, the first lens group G 1 having a fixed refractive power during zooming, the second lens group G 2 having a negative refractive power movable during zooming, and the second lens group G 2 having a negative refractive power movable during zooming are also sequentially arranged. It includes a third lens group G 3 having a refractive power and a fourth lens group G 4 having a positive refractive power which is fixed during zooming. When zooming from the wide-angle end to the telephoto end,
The lens group G 2 monotonously moves from the object side to the image side along the optical axis. On the other hand, the third lens group G 3 moves from the image side to the object side along the optical axis up to the intermediate position between the wide-angle end and the telephoto end, and along the optical axis from the intermediate position to the telephoto end. And moves from the object side to the image side. That is, the third lens group G 3
When zooming from the wide-angle end to the telephoto end, it reciprocates so as to draw a convex on the object side.
【００１１】以下の表１、表２及び表３に、それぞれ第
１、第２及び第３実施例の諸元を示す。各表のうちの
［レンズ諸元］中、第１カラムは物体側からのレンズ面
の番号、第２カラムはレンズ面の曲率半径ｒ、第３カラ
ムはレンズ面間隔ｄ、第４カラムは屈折率ｎのｄ線（λ
＝５８７．６ｎｍ）に対する値、第５カラムはアッベ数
νのｄ線に対する値、第６カラムはレンズ群番号を表
す。また各表のうちの［レンズ群間隔］中、ｆは全系の
焦点距離、Ｂ．ｆはバックフォーカスを表す。なお［レ
ンズ群間隔］中、中間位置とは、必ずしもその位置にて
第３群Ｇ3の移動方向が反転するという位置を意味する
ものではない。また以下の表４に、各実施例の各条件
（１）〜（３）におけるパラメータの値を示す。Table 1, Table 2 and Table 3 below show the specifications of the first, second and third embodiments, respectively. In [Lens Specifications] in each table, the first column is the number of the lens surface from the object side, the second column is the radius of curvature r of the lens surface, the third column is the lens surface distance d, and the fourth column is the refraction. D line of rate n (λ
= 587.6 nm), the fifth column shows the Abbe number ν for the d-line, and the sixth column shows the lens group number. In addition, in the [lens group interval] in each table, f is the focal length of the entire system, and B. f represents the back focus. In the [lens group interval], the intermediate position does not necessarily mean a position at which the moving direction of the third group G 3 is reversed. Table 4 below shows parameter values under the conditions (1) to (3) of each example.
【００１２】[0012]
【表１】 ［レンズ諸元］ ｒ ｄ ｎd νd 1 130.55574 2.00000 1.796681 45.372 Ｇ1 2 35.07945 16.10000 3 -519.33439 2.00000 1.796681 45.372 Ｇ1 4 119.91854 6.40000 5 -155.00380 2.00000 1.796681 45.372 Ｇ1 6 -7741.53760 0.10000 7 75.71310 7.80000 1.805180 25.432 Ｇ1 8 -3969.95585 12.12254 9 -150.09447 2.10000 1.796681 45.372 Ｇ1 10 4704.77313 3.64531 11 -328.21948 8.40000 1.518601 69.977 Ｇ1 12 -60.00590 0.10000 13 89.29587 2.00000 1.805180 25.432 Ｇ1 14 43.00099 14.20000 1.518601 69.977 Ｇ1 15 -228.66965 0.10000 16 60.27235 8.50000 1.497820 82.516 Ｇ1 17 1459.90100 0.10000 18 62.97685 5.30000 1.640000 60.032 Ｇ1 19 168.90277 ｄ19 20 31.40424 0.90000 1.902650 35.724 Ｇ2 21 12.95768 5.20000 22 53.53564 0.90000 1.869940 39.816 Ｇ2 23 24.62623 4.00000 24 -51.10068 1.00000 1.869940 39.816 Ｇ2 25 204.81120 0.10000 26 29.86116 5.70000 1.755200 27.613 Ｇ2 27 -24.98903 1.00000 1.840421 43.347 Ｇ2 28 -100.34912 ｄ28 29 -26.71573 1.00000 1.796310 40.897 Ｇ3 30 57.91678 3.70000 1.805180 25.432 Ｇ3 31 -57.98842 ｄ31 32 138.02179 4.00000 1.805182 25.406 Ｇ4（Ｌ41） 33 -121.32380 0.10000 34 36.85093 10.50000 1.548139 45.869 Ｇ4（Ｌ42） 35 -34.67484 1.60000 1.805182 25.346 Ｇ4（Ｌ42） 36 128.71939 0.20000 37 27.46290 7.00000 1.595071 35.510 Ｇ4（Ｌ43） 38 -173.83806 0.20000 39 32.51620 1.50000 1.805182 25.346 Ｇ4（Ｌ44） 40 16.90704 4.16480 41 37.20312 7.00000 1.497820 82.516 Ｇ4（Ｌ45） 42 -18.70933 1.50000 1.840421 43.347 Ｇ4（Ｌ45） 43 682.80505 0.30000 44 96.97765 5.00000 1.497820 82.516 Ｇ4（Ｌ46） 45 -32.33482 B.f ［レンズ群間隔］ 広角端 中間位置 望遠端 ｆ 7.5 30.0 65.4 ｄ19 1.70143 36.00894 45.31336 ｄ28 40.53352 3.83202 8.15266 ｄ31 18.98332 21.37731 7.75224 B.f 45.94306 45.94306 45.94306[Table 1] [Lens specifications] r d n d ν d 1 130.55574 2.00000 1.796681 45.372 G 1 2 35.07945 16.10000 3 -519.33439 2.00000 1.796681 45.372 G 1 4 119.91854 6.40000 5 -155.00380 2.00000 1.796681 45.372 G 1 6 -7741.53760 0.10000 7 75.713 7.80000 1.805180 25.432 G 1 8 -3969.95585 12.12254 9 -150.09447 2.10000 1.796681 45.372 G 1 10 4704.77313 3.64531 11 -328.21948 8.40000 1.518601 69.977 G 1 12 -60.00590 0.10000 13 89.29587 2.00000 1.805180 25.432 G 1 14 43.00099 14.20000 1.518601 69.977 G 1 15 -228.66965 0.10000 16 60.27235 8.50000 1.497820 82.516 G 1 17 1459.90100 0.10000 18 62.97685 5.30000 1.640000 60.032 G 1 19 168.90277 d 19 20 31.40424 0.90000 1.902650 35.724 G 2 21 12.95768 5.20000 22 53.53564 0.90000 1.869940 39.816 G 2 23 24.62623 4.00000 24 -51.10068 1.00000 1.869940 39.816 G 2 25 204.81120 0.10000 26 29.86116 5.70000 1.755200 27.613 G 2 27 -24.98903 1.00000 1.840421 43.347 G 2 28 -100.34912 d 28 29 -26.71573 1.00000 1.796310 40.89 7 G 3 30 57.91678 3.70000 1.805180 25.432 G 3 31 -57.98842 d 31 32 138.02179 4.00000 1.805182 25.406 G 4 (L 41 ) 33 -121.32380 0.10000 34 36.85093 10.50000 1.548139 45.869 G 4 (L 42 ) 35 -34.67484 1.60000 1.805182 25.346 G 4 L 42 ) 36 128.71939 0.20000 37 27.46290 7.00000 1.595071 35.510 G 4 (L 43 ) 38 -173.83806 0.20000 39 32.51620 1.50000 1.805182 25.346 G 4 (L 44 ) 40 16.90704 4.16480 41 37.20312 7.00000 1.497820 82.516 G 4 (L 45 ) 42 -18.70933 1.50000 1.840421 43.347 G 4 (L 45 ) 43 682.80505 0.30000 44 96.97765 5.00000 1.497820 82.516 G 4 (L 46 ) 45 -32.33482 Bf [Lens group spacing] Wide angle end Intermediate position Telephoto end f 7.5 30.0 65.4 d 19 1.70143 36.00894 45.31336 d 28 40.53352 3.8320 8.15266 d 31 18.98332 21.37731 7.75224 Bf 45.94306 45.94306 45.94306
【００１３】[0013]
【表２】 ［レンズ諸元］ ｒ ｄ ｎd νd 1 130.74752 2.00000 1.796681 45.372 Ｇ1 2 34.62333 16.10000 3 -532.32793 2.00000 1.796681 45.372 Ｇ1 4 121.74926 6.40000 5 -155.92181 2.00000 1.796681 45.372 Ｇ1 6 -4321.20770 0.10000 7 75.80600 7.80000 1.805180 25.432 Ｇ1 8 -4132.28178 11.74529 9 -152.21513 2.10000 1.796681 45.372 Ｇ1 10 3280.58492 3.66466 11 -324.92390 8.40000 1.518601 69.977 Ｇ1 12 -59.93529 0.10000 13 90.49783 2.00000 1.805180 25.432 Ｇ1 14 43.05886 14.20000 1.518601 69.977 Ｇ1 15 -228.30401 0.10000 16 60.36171 8.50000 1.497820 82.516 Ｇ1 17 -1727.19500 0.10000 18 63.46304 5.30000 1.640000 60.032 Ｇ1 19 149.73486 ｄ19 20 27.75464 0.90000 1.902650 35.724 Ｇ2 21 12.57032 5.20000 22 92.20506 0.90000 1.869940 39.816 Ｇ2 23 24.42891 4.00000 24 -46.13576 1.00000 1.869940 39.816 Ｇ2 25 -1257.83820 0.10000 26 31.20117 5.70000 1.755200 27.613 Ｇ2 27 -24.98903 1.00000 1.840421 43.347 Ｇ2 28 -83.56594 ｄ28 29 -25.73517 1.00000 1.796310 40.897 Ｇ3 30 57.91678 3.70000 1.805180 25.432 Ｇ3 31 -54.05873 ｄ31 32 146.10701 4.00000 1.805182 25.406 Ｇ4（Ｌ41） 33 -119.24850 0.10000 34 40.47284 10.50000 1.548139 45.869 Ｇ4（Ｌ42） 35 -39.54173 1.60000 1.805182 25.346 Ｇ4（Ｌ42） 36 128.91160 0.20000 37 24.34180 7.00000 1.575010 41.421 Ｇ4（Ｌ43） 38 -440.78716 0.20000 39 31.08239 1.50000 1.795040 28.565 Ｇ4（Ｌ44） 40 17.18011 5.82892 41 31.54858 7.00000 1.497820 82.516 Ｇ4（Ｌ45） 42 -18.46039 1.50000 1.840421 43.347 Ｇ4（Ｌ45） 43 -3739.78830 0.10000 44 61.17731 1.50000 1.840421 43.347 Ｇ4（Ｌ46） 45 28.35109 6.00000 1.497820 82.516 Ｇ4（Ｌ46） 46 -36.52912 B.f ［レンズ群間隔］ 広角端 中間位置 望遠端 ｆ 7.5 30.0 65.4 ｄ19 1.99626 36.31277 45.61143 ｄ28 39.96300 3.25662 7.58904 ｄ31 18.98507 21.37494 7.74386 B.f 42.83487 42.83487 42.83487[Table 2] [Lens specifications] r d n d ν d 1 130.74752 2.00000 1.796681 45.372 G 1 2 34.62333 16.10000 3 -532.32793 2.00000 1.796681 45.372 G 1 4 121.74926 6.40000 5 -155.92181 2.00000 1.796681 45.372 G 1 6 -4321.20770 0.10000 7 75.80 7.80000 1.805180 25.432 G 1 8 -4132.28178 11.74529 9 -152.21513 2.10000 1.796681 45.372 G 1 10 3280.58492 3.66466 11 -324.92390 8.40000 1.518601 69.977 G 1 12 -59.93529 0.10000 13 90.49783 2.00000 1.805180 25.432 G 1 14 43.05886 14.20000 1.518601 69.977 G 1 15 -228.30401 0.10000 16 60.36171 8.50000 1.497820 82.516 G 1 17 -1727.19500 0.10000 18 63.46304 5.30000 1.640000 60.032 G 1 19 149.73486 d 19 20 27.75464 0.90000 1.902650 35.724 G 2 21 12.57032 5.20000 22 92.20506 0.90000 1.869940 39.816 G 2 23 24.42891 4.00000 24 -46.13576 1.00000 1.869940 39.816 G 2 25 -1257.83820 0.10000 26 31.20117 5.70000 1.755200 27.613 G 2 27 -24.98903 1.00000 1.840421 43.347 G 2 28 -83.56594 d 28 29 -25.73517 1.00000 1.796310 40. 897 G 3 30 57.91678 3.70000 1.805180 25.432 G 3 31 -54.05873 d 31 32 146.10701 4.00000 1.805182 25.406 G 4 (L 41) 33 -119.24850 0.10000 34 40.47284 10.50000 1.548139 45.869 G 4 (L 42) 35 -39.54173 1.60000 1.805182 25.346 G 4 ( L 42 ) 36 128.91160 0.20000 37 24.34180 7.00000 1.575010 41.421 G 4 (L 43 ) 38 -440.78716 0.20000 39 31.08239 1.50000 1.795040 28.565 G 4 (L 44 ) 40 17.18011 5.82892 41 31.54858 7.00000 1.497820 82.516 G 4 (L 45 ) 42 -18.46039 1.50000 1.840421 43.347 G 4 (L 45 ) 43 -3739.78830 0.10000 44 61.17731 1.50000 1.840421 43.347 G 4 (L 46 ) 45 28.35109 6.00000 1.497820 82.516 G 4 (L 46 ) 46 -36.52912 Bf [Lens group distance] Wide angle end Mid position Telephoto end f 7.5 30.0 65.4 d 19 1.99626 36.31277 45.61143 d 28 39.96300 3.25662 7.58904 d 31 18.98507 21.37494 7.74386 Bf 42.83487 42.83487 42.83487
【００１４】[0014]
【表３】 ［レンズ諸元］ ｒ ｄ ｎd νd 1 130.46168 2.00000 1.796681 45.372 Ｇ1 2 34.91686 16.10000 3 -522.62187 2.00000 1.796681 45.372 Ｇ1 4 119.99893 6.40000 5 -155.19804 2.00000 1.796681 45.372 Ｇ1 6 -6909.98880 0.10000 7 75.71141 7.80000 1.805180 25.432 Ｇ1 8 -3404.55759 11.97305 9 -150.07130 2.10000 1.796681 45.372 Ｇ1 10 4727.52016 3.59087 11 -330.00042 8.40000 1.518601 69.977 Ｇ1 12 -60.06636 0.10000 13 90.30983 2.00000 1.805180 25.432 Ｇ1 14 43.00077 14.20000 1.518601 69.977 Ｇ1 15 -228.70754 0.10000 16 60.26225 8.50000 1.497820 82.516 Ｇ1 17 3013.42510 0.10000 18 63.01631 5.30000 1.640000 60.032 Ｇ1 19 165.66323 ｄ19 20 28.43204 0.90000 1.902650 35.724 Ｇ2 21 12.54813 5.20000 22 59.34553 0.90000 1.869940 39.816 Ｇ2 23 26.04182 4.00000 24 -48.19237 1.00000 1.869940 39.816 Ｇ2 25 195.33909 0.10000 26 29.93173 5.70000 1.755200 27.613 Ｇ2 27 -24.98903 1.00000 1.840421 43.347 Ｇ2 28 -96.32006 ｄ28 29 -26.69799 1.00000 1.796310 40.897 Ｇ3 30 57.91678 3.70000 1.805180 25.432 Ｇ3 31 -57.91482 ｄ31 32 146.27618 4.00000 1.805182 25.406 Ｇ4（Ｌ41） 33 -119.21327 0.10000 34 40.56956 10.50000 1.548139 45.869 Ｇ4（Ｌ42） 35 -41.00497 1.60000 1.805182 25.346 Ｇ4（Ｌ42） 36 128.76895 0.20000 37 24.49054 7.00000 1.575010 41.421 Ｇ4（Ｌ43） 38 -585.12358 0.20000 39 31.10311 1.50000 1.795040 28.565 Ｇ4（Ｌ44） 40 17.16962 5.82892 41 31.48902 7.00000 1.497820 82.516 Ｇ4（Ｌ45） 42 -18.78555 1.50000 1.840421 43.347 Ｇ4（Ｌ45） 43 9602.94930 0.10000 44 60.70814 1.50000 1.840421 43.347 Ｇ4（Ｌ46） 45 30.24329 6.00000 1.497820 82.516 Ｇ4（Ｌ46） 46 -37.61969 B.f ［レンズ群間隔］ 広角端 中間位置 望遠端 ｆ 7.51532 30.00000 65.40000 ｄ19 1.61428 35.92694 45.22731 ｄ28 40.72322 4.02303 8.35569 ｄ31 18.98327 21.37080 7.73777 B.f 42.91843 42.91843 42.91843[Table 3] [Lens specifications] r d n d ν d 1 130.46168 2.00000 1.796681 45.372 G 1 2 34.91686 16.10000 3 -522.62187 2.00000 1.796681 45.372 G 1 4 119.99893 6.40000 5 -155.19804 2.00000 1.796681 45.372 G 1 6 -6909.98880 0.10000 7 75.71 7.80000 1.805180 25.432 G 1 8 -3404.55759 11.97305 9 -150.07130 2.10000 1.796681 45.372 G 1 10 4727.52016 3.59087 11 -330.00042 8.40000 1.518601 69.977 G 1 12 -60.06636 0.10000 13 90.30983 2.00000 1.805180 25.432 G 1 14 43.00077 14.20000 1.518601 69.977 G 1 15 -228.70754 0.10000 16 60.26225 8.50000 1.497820 82.516 G 1 17 3013.42510 0.10000 18 63.01631 5.30000 1.640000 60.032 G 1 19 165.66323 d 19 20 28.43204 0.90000 1.902650 35.724 G 2 21 12.54813 5.20000 22 59.34553 0.90000 1.869940 39.816 G 2 23 26.04182 4.00000 24 -48.19237 1.00000 1.869940 39.816 G 2 25 195.33909 0.10000 26 29.93173 5.70000 1.755200 27.613 G 2 27 -24.98903 1.00000 1.840421 43.347 G 2 28 -96.32006 d 28 29 -26.69799 1.00000 1.796310 40.897 G 3 30 57.91678 3.70000 1.805180 25.432 G 3 31 -57.91482 d 31 32 146.27618 4.00000 1.805182 25.406 G 4 (L 41 ) 33 -119.21327 0.10000 34 40.56956 10.50000 1.548139 45.869 G 4 (L 42 ) 35 -41.00497 1.60000 1.805182 25.346 G 4 42 ) 36 128.76895 0.20000 37 24.49054 7.00000 1.575010 41.421 G 4 (L 43 ) 38 -585.12358 0.20000 39 31.10311 1.50000 1.795040 28.565 G 4 (L 44 ) 40 17.16962 5.82892 41 31.48902 7.00000 1.497820 82.516 1.5 G 4 (L 45 ) 42 -18.78555 1.50000 43.347 G 4 (L 45 ) 43 9602.94930 0.10000 44 60.70814 1.50000 1.840421 43.347 G 4 (L 46 ) 45 30.24329 6.00000 1.497820 82.516 G 4 (L 46 ) 46 -37.61969 Bf [Lens group interval] Wide angle end Mid position Telephoto end f 7.51532 30.00000 65.40000 d 19 1.61428 35.92694 45.22731 d 28 40.72322 4.02303 8.35569 d 31 18.98327 21.37080 7.73777 Bf 42.91843 42.91843 42.91843
【００１５】[0015]
【表４】 実施例番号 １ ２ ３ ｆT 65.4 65.4 65.4 ＦT 2.56 2.57 2.56 ｆ1 35.81 35.81 35.81 β2W -0.45 -0.45 -0.45 Ｖ 8.72 8.72 8.72 Ａ4 4.1648 5.82892 5.82892 Ｄ4 43.0648 47.02892 47.02892 （１）（ＦT）1/2・ｆ1／ｆT 0.88 0.88 0.88 （２）｜β2W・Ｖ1/2｜ 1.33 1.33 1.33 （３）Ａ4／Ｄ4 0.097 0.124 0.124[Table 4] Example No. 1 2 3 3 f T 65.4 65.4 65.4 F T 2.56 2.57 2.56 f 1 35.81 35.81 35.81 β 2W -0.45 -0.45 -0.45 V 8.72 8.72 8.72 A 4 4.1648 5.82892 5.82892 D 4 43.0648 47.02892 47.02892 (1) (F T ) 1/2・ f 1 / f T 0.88 0.88 0.88 (2) ｜ β 2W・ V 1/2 ｜ 1.33 1.33 1.33 (3) A 4 / D 4 0.097 0.124 0.124
【００１６】図２、図４及び図６に、それぞれに第１、
第２及び第３実施例の球面収差と非点収差と歪曲収差を
示す。各収差はｄ線に対する収差を表す。球面収差図
中、点線は正弦条件を表し、非点収差図中、破線はメリ
ジオナル像面を表し、実線はサジタル像面を表す。各図
中ＦNOはＦナンバー、Ｙは像高を表す。各収差図より明
らかなように、各実施例ともに諸収差が良好に補正され
ていることが判る。すなわち各実施例では前述のレンズ
系の構成をとり、且つ各条件（１）〜（３）を満足する
構成をとることにより、小型軽量で、高仕様且つ高性能
なズームレンズを実現している。In FIGS. 2, 4 and 6, the first,
The spherical aberration, astigmatism, and distortion of the second and third examples are shown. Each aberration represents an aberration for the d line. In the spherical aberration diagram, the dotted line represents the sine condition, the broken line represents the meridional image plane, and the solid line represents the sagittal image plane in the astigmatism diagram. In each figure, F NO represents the F number and Y represents the image height. As is clear from each aberration diagram, it is understood that various aberrations are satisfactorily corrected in each of the examples. That is, in each embodiment, by adopting the above-described lens system configuration and satisfying the respective conditions (1) to (3), a compact and lightweight zoom lens having high specifications and high performance is realized. .
【００１７】[0017]
【発明の効果】以上の如く、本発明によれば、広画角か
つ大ズーム比であって、しかも明るく小型でありなが
ら、諸収差が良好に補正された高性能のズームレンズが
実現される。As described above, according to the present invention, it is possible to realize a high-performance zoom lens which has a wide angle of view and a large zoom ratio, is bright, is compact, and has various aberrations well corrected. .
【図１】本発明による第１実施例のレンズ構成図FIG. 1 is a lens configuration diagram of a first embodiment according to the present invention.
【図２】第１実施例の各焦点距離状態における諸収差図FIG. 2 is a diagram of various types of aberration in each focal length state of the first example.
【図３】第２実施例のレンズ構成図FIG. 3 is a lens configuration diagram of a second embodiment.
【図４】第２実施例の各焦点距離状態における諸収差図FIG. 4 is a diagram of various types of aberration in each focal length state of the second example.
【図５】第３実施例のレンズ構成図FIG. 5 is a lens configuration diagram of a third embodiment.
【図６】第３実施例の各焦点距離状態における諸収差図FIG. 6 is a diagram of various types of aberration in each focal length state of the third example.
【図７】本発明によるズームレンズの第２レンズ群Ｇ2
の作用を示す説明図FIG. 7 is a second lens group G 2 of the zoom lens according to the present invention.
Explanatory diagram showing the action of
Ｇ1…第１レンズ群 Ｇ2…第２レンズ群 Ｇ3…第３レンズ群 Ｇ4…第４レンズ群 Ｌ41〜Ｌ46…第４レンズ群中のレンズ群G 1 ... lens group of the first lens group G 2 ... the second lens group G 3 ... third lens group G 4 ... fourth lens group L 41 ~L 46 ... in the fourth lens group
Claims (3)
折力を有する第１レンズ群Ｇ1と、ズーミングに際し共
に可動で共に負屈折力を有する第２レンズ群Ｇ2及び第
３レンズ群Ｇ3と、ズーミング中固定で正屈折力を有す
る第４レンズ群Ｇ4とを有し、広角端から望遠端へのズ
ーミングに際して、前記第２レンズ群Ｇ2は光軸に沿っ
て物体側から像側に単調に移動し、前記第３レンズ群Ｇ
3は、前記広角端と望遠端との間の中間位置までは光軸
に沿って像側から物体側に移動し、前記中間位置から望
遠端までは光軸に沿って物体側から像側に移動するズー
ムレンズにおいて、 前記第１レンズ群Ｇ1は少なくとも４つのレンズ群から
なり、前記第２レンズ群Ｇ2は少なくとも４つのレンズ
群からなり、前記第４レンズ群Ｇ4は少なくとも６つの
レンズ群からなり、且つ次の各条件を満足することを特
徴とするズームレンズ。 ０．７＜（ＦT）1/2・ｆ1／ｆT＜１．１ （１） １．１＜｜β2W・Ｖ1/2｜＜１．５ （２） Ａ4／Ｄ4＜０．１５ （３） 但し、 ｆT：望遠端における全系の合成焦点距離 ＦT：望遠端におけるＦナンバー ｆ1：第１レンズ群Ｇ1の焦点距離 β2W：第２レンズ群Ｇ2の広角端における倍率 Ｖ：ズーム比 Ａ4：第４レンズ群Ｇ4中の最大空気間隔 Ｄ4：第４レンズ群Ｇ4のうち、最も物体側のレンズ面か
ら最も像側のレンズ面までの距離 である。1. A first lens group G 1 which is fixed during zooming and has a positive refractive power, and a second lens group G 2 and a third lens group G 2 which are both movable during zooming and have a negative refractive power in order from the object side. 3 and a fourth lens group G 4 having a positive refracting power which is fixed during zooming, and at the time of zooming from the wide-angle end to the telephoto end, the second lens group G 2 forms an image from the object side along the optical axis. To the third lens group G
3 moves from the image side to the object side along the optical axis up to an intermediate position between the wide-angle end and the telephoto end, and from the object side to the image side along the optical axis from the intermediate position to the telephoto end. In the moving zoom lens, the first lens group G 1 includes at least four lens groups, the second lens group G 2 includes at least four lens groups, and the fourth lens group G 4 includes at least six lenses. A zoom lens comprising a group and satisfying the following conditions. 0.7 <( FT ) 1/2 · f 1 / f T <1.1 (1) 1.1 <| β 2W · V 1/2 | <1.5 (2) A 4 / D 4 < 0.15 (3) where f T : composite focal length of the entire system at the telephoto end F T : F number at the telephoto end f 1 : focal length of the first lens group G 1 β 2W : of the second lens group G 2 magnification at the wide-angle end V: zoom ratio a 4: fourth lens group G 4 in the maximum air gap D 4 of: of the fourth lens group G 4, the distance from the lens surface closest to the object side to the lens surface on the most image side Is.
少なくとも３つの正レンズ群Ｌ41、Ｌ42及びＬ43と、１
つの負レンズ群Ｌ44と、少なくとも２つの正レンズ群Ｌ
45及びＬ46とからなる、請求項１記載のズームレンズ。2. The fourth lens group G 4 comprises, in order from the object side,
At least three positive lens groups L 41 , L 42 and L 43 , and 1
One negative lens unit L 44 and at least two positive lens unit L
The zoom lens according to claim 1, comprising 45 and L 46 .
正レンズ群Ｌ41、Ｌ42及びＬ43と、前記少なくとも２つ
の正レンズ群Ｌ45及びＬ46とのうち、少なくとも２つの
正レンズ群は貼り合わせレンズであり、且つ前記負レン
ズ群Ｌ44は像側に凹面を向けたメニスカスレンズであ
る、請求項２記載のズームレンズ。3. At least two positive lenses among the at least three positive lens groups L 41 , L 42 and L 43 of the fourth lens group G 4 and the at least two positive lens groups L 45 and L 46. The zoom lens according to claim 2, wherein the group is a cemented lens, and the negative lens group L 44 is a meniscus lens having a concave surface facing the image side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7207756A JPH0933812A (en) | 1995-07-20 | 1995-07-20 | Zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7207756A JPH0933812A (en) | 1995-07-20 | 1995-07-20 | Zoom lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0933812A true JPH0933812A (en) | 1997-02-07 |
Family
ID=16545031
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7207756A Pending JPH0933812A (en) | 1995-07-20 | 1995-07-20 | Zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0933812A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6038082A (en) * | 1997-11-05 | 2000-03-14 | Fuji Photo Optical Co., Ltd. | Wide-angle zoom lens |
| EP2048531A1 (en) * | 2007-10-09 | 2009-04-15 | Fujinon Corporation | Rear-focusing type zoom lens and imaging apparatus |
| EP2048532A1 (en) * | 2007-10-09 | 2009-04-15 | Fujinon Corporation | Rear-focusing type zoom lens and imaging apparatus |
| EP2124083A1 (en) * | 2008-05-21 | 2009-11-25 | Canon Kabushiki Kaisha | Telephoto-type zoom lens comprising four lens groups |
-
1995
- 1995-07-20 JP JP7207756A patent/JPH0933812A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6038082A (en) * | 1997-11-05 | 2000-03-14 | Fuji Photo Optical Co., Ltd. | Wide-angle zoom lens |
| EP2048531A1 (en) * | 2007-10-09 | 2009-04-15 | Fujinon Corporation | Rear-focusing type zoom lens and imaging apparatus |
| EP2048532A1 (en) * | 2007-10-09 | 2009-04-15 | Fujinon Corporation | Rear-focusing type zoom lens and imaging apparatus |
| US7589909B2 (en) | 2007-10-09 | 2009-09-15 | Fujinon Corporation | Rear-focusing type zoom lens and imaging apparatus |
| EP2124083A1 (en) * | 2008-05-21 | 2009-11-25 | Canon Kabushiki Kaisha | Telephoto-type zoom lens comprising four lens groups |
| US7929222B2 (en) | 2008-05-21 | 2011-04-19 | Canon Kabushiki Kaisha | Zoom lens system and camera including the same |
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