JP2784942B2 - Compact high-magnification 4-group zoom lens - Google Patents
Compact high-magnification 4-group zoom lensInfo
- Publication number
- JP2784942B2 JP2784942B2 JP22177789A JP22177789A JP2784942B2 JP 2784942 B2 JP2784942 B2 JP 2784942B2 JP 22177789 A JP22177789 A JP 22177789A JP 22177789 A JP22177789 A JP 22177789A JP 2784942 B2 JP2784942 B2 JP 2784942B2
- Authority
- JP
- Japan
- Prior art keywords
- lens
- lens group
- group
- positive
- object side
- 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.)
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Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、コンパクトカメラ等に使用される構造の簡
単な高倍率４群ズームレンズに関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-magnification four-unit zoom lens having a simple structure used for a compact camera or the like.
近年、携帯性の良好なコンパクトカメラ等においても
ズームレンズの使用により広角から望遠にわたる映像を
撮影できることが要望されており、これに従ってコンパ
クトカメラ用の各種のズームレンズが開発されている。
このズームレンズとしては、先ず構造が簡単になるた
め、２群形式あるいは３群形式のズームレンズが開発さ
れているが、高倍率に得にくいのみならず、ズーミング
にさいしての諸収差の補正が困難であるという欠点があ
った。そこで、コンパクトカメラに対する高級化の要望
が高まるにつれ、４群ズームレンズが広く採用されるに
至っている。しかし、４群ズームレンズでは収差を良好
に補正して高倍率を得ることができるという利点はある
が、構造が複雑となり、大型化してしまい、コンパクト
カメラ本来の利点が損なわれてしまいかねないという問
題点があった。In recent years, it has been demanded that a wide-angle to telephoto image can be captured by using a zoom lens even in a compact camera or the like having good portability, and various zoom lenses for the compact camera have been developed accordingly.
As this zoom lens, a two-group type or three-group type zoom lens has been developed because its structure is simplified. However, it is not only difficult to obtain a high magnification, but it is also necessary to correct various aberrations for zooming. There was a drawback that it was difficult. Therefore, as the demand for higher-grade compact cameras increases, four-group zoom lenses have been widely adopted. However, although the four-group zoom lens has the advantage that aberrations can be satisfactorily corrected and a high magnification can be obtained, the structure becomes complicated, the size becomes large, and the advantages inherent in a compact camera may be impaired. There was a problem.
本発明は、かかる現状に鑑み、物体側から順に正の屈
折力の第１レンズ群、正の屈折力の第２レンズ群、正の
屈折力の第３レンズ群、負の屈折力の第４レンズ群で構
成し、広角端から望遠端へのズーミングにさいし、第１
レンズ群と第４レンズ群は物体側へ一体に移動させ、第
２レンズ群は像面変動を補正するように移動させ、第３
レンズ群は物体側へ移動させるようにしたズームレンズ
であって、第１レンズ群は少なくとも１つの正レンズと
１つの負レンズとからなり、第２レンズ群は少なくとも
１つの物体側に凸面を向けた正のメニスカスレンズから
なり、第３レンズ群は少なくとも１つの正レンズと１つ
の負レンズとからなり、第４レンズ群は少なくとも１つ
の物体側に凹面を向けた負レンズからなることを特徴と
するコンパクトな高倍率４群ズームレンズである。In view of the current situation, the present invention provides, in order from the object side, a first lens group having a positive refractive power, a second lens group having a positive refractive power, a third lens group having a positive refractive power, and a fourth lens group having a negative refractive power. For zooming from the wide-angle end to the telephoto end, the first
The lens group and the fourth lens group are moved integrally to the object side, the second lens group is moved so as to correct the image plane variation, and the third lens group is moved.
The first lens group includes at least one positive lens and one negative lens, and the second lens group has a convex surface facing at least one object side. The third lens group comprises at least one positive lens and one negative lens, and the fourth lens group comprises at least one negative lens having a concave surface facing the object side. This is a compact, high-magnification four-group zoom lens.
本発明においては、ズーミングのさいに正の第１レン
ズ群と正の第２レンズ群と正の第３レンズ群と負の第４
レンズ群を光軸に沿って移動させることにより、広角か
ら望遠まで焦点距離を連続的に変化させることができる
とともに、第２レンズ群を像面変動を補正するように移
動させるとともに、第１レンズ群と第４レンズ群のズー
ミングによる移動量を同じとすることができるので、構
造を簡略化することができる。In the present invention, the positive first lens unit, the positive second lens unit, the positive third lens unit, and the negative fourth lens unit are used during zooming.
By moving the lens group along the optical axis, the focal length can be continuously changed from wide angle to telephoto, and the second lens group is moved so as to correct the image plane fluctuation, and the first lens group is moved. Since the amount of movement of the group and the fourth lens group by zooming can be the same, the structure can be simplified.
本発明に係るズームレンズ系の移動態様図を示す第１
図において、１は合成の焦点距離が正の第１レンズ群、
２は合成の焦点距離が正の第２レンズ群、３は合成焦点
距離が正の第３レンズ群、４は合成焦点距離が負の第４
レンズ群、Ｘは光軸、Ｐ′は結像位置である。FIG. 1 is a diagram illustrating a movement mode diagram of a zoom lens system according to the present invention.
In the figure, reference numeral 1 denotes a first lens group having a positive combined focal length,
2 is a second lens group having a positive combined focal length, 3 is a third lens group having a positive combined focal length, and 4 is a fourth lens group having a negative combined focal length.
A lens group, X is an optical axis, and P 'is an image forming position.
第１レンズ群１は、特に望遠側の球面収差を補正する
ためのレンズ群であって、少なくとも１つの正レンズと
少なくとも１つの負のレンズからなる。The first lens group 1 is a lens group for correcting spherical aberration particularly on the telephoto side, and includes at least one positive lens and at least one negative lens.
第２レンズ群は、ズーミングによる像面湾曲変動の補
正をするレンズ群であって、少なくとも１つの正のメニ
スカスレンズからなる。The second lens group is a lens group for correcting a variation in curvature of field due to zooming, and includes at least one positive meniscus lens.
第３レンズ群３は、フォーカシングによる収差変動、
特に像面湾曲収差の補正をするレンズ群であって、絞り
Ｓを挟んで前方に少なくとも１つの正のレンズと少なく
とも１つの負のレンズ、後方に少なくとも１つの正のレ
ンズと少なくとも１つの負のレンズとからなる。The third lens group 3 includes an aberration variation due to focusing,
In particular, this is a lens group for correcting field curvature aberration, wherein at least one positive lens and at least one negative lens are located forward and at least one positive lens and at least one negative lens are located behind the stop S. Consists of a lens.
第４レンズ群４は、少なくとも１つの正のレンズと少
なくとも１つの負のレンズからなる。The fourth lens group 4 includes at least one positive lens and at least one negative lens.
第１図において、広角端（Ｗ）から望遠端（Ｔ）への
ズーミングに際しては、第１レンズ群１と第３レンズ群
３、第４レンズ群４を物体側へ単調に移動させ、第２レ
ンズ群２を像面変動を補正するように物体側に向けて単
調に移動させる。このさい第１レンズ群１と第４レンズ
群４とは同一の移動量として、一体的に移動させる。こ
の移動は直線移動のほか、他の移動でも良い。このた
め、４群ズームレンズ系としては構造が簡略化できるこ
ととなる。In FIG. 1, during zooming from the wide-angle end (W) to the telephoto end (T), the first lens unit 1, the third lens unit 3, and the fourth lens unit 4 are monotonously moved to the object side, and The lens group 2 is monotonously moved toward the object side so as to correct the image plane fluctuation. At this time, the first lens group 1 and the fourth lens group 4 are integrally moved with the same amount of movement. This movement may be other than linear movement. Therefore, the structure of the four-unit zoom lens system can be simplified.
広角端（Ｗ）から望遠端（Ｔ）へのズーミングにおい
て、第１レンズ群１と第２レンズ群２との間隔D1は一旦
増大してから減少し、第２レンズ群２と第３レンズ群３
との間の間隔D2は増大し、第３レンズ群３と第４レンズ
群４との間の間隔D3は減少する。During zooming from the wide-angle end (W) to the telephoto end (T), spacing D 1 of the first lens group 1 and the second lens group 2 is reduced after increasing once, the second lens group 2 and the third lens Group 3
Spacing D 2 is increased between, and the third lens group 3 distance D 3 between the fourth lens group 4 decreases.
このさい、フォーカシングは第１レンズ群１、第３レ
ンズ群３、第４レンズ群４のいずれで行ってもよい。At this time, focusing may be performed by any of the first lens group 1, the third lens group 3, and the fourth lens group 4.
本発明においては、以下の条件を満足することが望ま
しい。In the present invention, it is desirable to satisfy the following conditions.
（１） 0.3＜fW/f2＜0.45 この条件式は、ズーミングの際に生ずる像面湾曲収差
等を補正するためのものであって、fWは広角端（Ｗ）で
の全系焦点距離、f2は第２レンズ群２の焦点距離であ
る。(1) 0.3 <f W / f 2 <0.45 This conditional expression is for correcting a field curvature aberration or the like generated during zooming, where f W is the focal point of the entire system at the wide-angle end (W). distance, f 2 is the focal length of the 2 second lens group.
この条件式の下限を満足しない場合には、中間焦点距
離における球面収差がアンダーになり、前記条件式の上
限を満足しない場合には、球面収差がオーバーとなる。When the lower limit of the conditional expression is not satisfied, the spherical aberration at the intermediate focal length is under. When the upper limit of the conditional expression is not satisfied, the spherical aberration is over.
以下、第２図に示したレンズ構成基本形を備えた本発
明の数値実施例を示す。Hereinafter, numerical examples of the present invention having the basic lens configuration shown in FIG. 2 will be described.
なお、第２図のレンズ構成は、以下のとおりである。 The lens configuration in FIG. 2 is as follows.
第１レンズ群１は、物体側に凸面を向けた負のメニス
カスレンズL1と両凸の正レンズL2とからなる。第２レン
ズ群２は、物体側に凸面を向けた正のメニスカスレンズ
L3からなる。第３レンズ群３は、両凹の負レンズL4と、
両凸の正レンズL5と像側に凸面を向けた負のメニスカス
レンズL6との接合レンズL5＋L6、物体側に凸面を向けた
負のメニスカスレンズL7と、両凸の正レンズL8と、物体
側に凸面を向けた負のメニスカスレンズL9と両凸の正レ
ンズL10との接合レンズL9＋L10とからなる。第４レンズ
群４は、物体側に凹面を向けた正のメニスカスレンズL
11と、両凹の負レンズL12とからなる。第３レンズ群３
のレンズL7とレンズL8との間に絞りＳが配設されてい
る。The first lens group 1 is composed of a negative meniscus lens L 1 and the biconvex positive lens L 2 Metropolitan having a convex surface facing the object. The second lens group 2 includes a positive meniscus lens having a convex surface facing the object side.
Consisting of L 3. The third lens group 3 is composed of a negative lens L 4 biconcave,
A cemented lens L 5 + L 6, a negative meniscus lens L 7 having a convex surface directed toward the object side and a negative meniscus lens L 6 having a convex surface directed toward the positive lens L 5 and the image side of the biconvex, biconvex positive lens and L 8, a cemented lens L 9 + L 10 Metropolitan of a negative meniscus lens L 9 having a convex surface on the object side and a positive lens L 10 of a biconvex. The fourth lens unit 4 includes a positive meniscus lens L having a concave surface facing the object side.
11, a negative lens L 12 and a bi-concave. Third lens group 3
Stop S is disposed between the the lens L 7 and the lens L 8.
以下の数値実施例の説明において、 ｍ ：物体側より順次数えた面番号 ri ：物体側から数えて第ｉ番目のレンズ面の曲率半径 di ：物体側から数えて第ｉ番目のレンズ成分の厚みま
たは空気間隔 ni ：物体側から数えて第ｉ番目のレンズ成分のｄ線に
対する屈折率 νi :物体側から数えて第ｉ番目のレンズ成分のアツベ
数 ｆ′：全系の合成焦点距離 Bf′：バックフォーカス とする。In the following description of the numerical examples, m: surface number sequentially counted from the object side r i : radius of curvature of the i-th lens surface counted from the object side d i : i-th lens component counted from the object side N i : the refractive index of the i-th lens component counted from the object side with respect to the d-line ν i : the Abbe number of the i-th lens component counted from the object side f ′: composite focal point of the whole system Distance Bf ': Back focus.
第１実施例の具体的構成は下表のとおりである。 The specific configuration of the first embodiment is as shown in the table below.
ｆ′ Bf′ 画角 Ｗ 39.20 8.73 58.0゜ Ｎ 60.00 25.85 38.6゜ Ｔ 111.40 57.31 21.4゜ d4 d6 d18 Ｗ 1.03 4.32 18.13 Ｎ 6.19 6.67 10.62 Ｔ 4.37 17.06 2.05 この具体的構成による収差曲線は第３図の如くなる。 f 'Bf' angle W 39.20 8.73 58.0 ° N 60.00 25.85 38.6 ° T 111.40 57.31 21.4 ° d 4 d 6 d 18 W 1.03 4.32 18.13 N 6.19 6.67 10.62 T 4.37 17.06 2.05 aberration curves FIG. 3 according to the specific structure It looks like
次に、第２実施例の具体的構成は、下表のとおりであ
る。Next, the specific configuration of the second embodiment is as shown in the table below.
ｆ′ Bf′ 画角 Ｗ 39.26 8.66 59.2゜ Ｎ 60.00 25.92 39.0゜ Ｔ 111.40 57.40 21.6゜ d4 d6 d18 Ｗ 1.04 4.65 18.08 Ｎ 6.01 7.13 10.63 Ｔ 4.30 17.32 2.15 この具体的構成による収差曲線は第４図の如くなる。 f 'Bf' angle W 39.26 8.66 59.2 ° N 60.00 25.92 39.0 ° T 111.40 57.40 21.6 ° d 4 d 6 d 18 W 1.04 4.65 18.08 N 6.01 7.13 10.63 T 4.30 17.32 2.15 aberration curves Figure 4 according to the specific structure It looks like
上記第１ないし第２の各実施例の収差曲線図である第
3,4図における各収差は、充分に実用に供されるもので
あることを示している。FIG. 12 is an aberration curve diagram of each of the first and second embodiments.
Each of the aberrations in FIGS. 3 and 4 indicate that they are sufficiently practical.
以上の説明から明らかなように、本発明によれば、第
１レンズ群ないし第４レンズ群を凸凸凸凹の構成にして
第１レンズ群と第４レンズ群を光軸に沿って物体側へ一
体に移動させ、少なくとも１つの物体側に凸面を向けた
正のメニスカスレンズで構成した第２レンズ群を像面変
動を補正するように光軸に沿って移動させる如くなした
ので、高倍率で、収差を良好に補正したコンパクトな４
群ズームレンズの提供が可能となった。As is apparent from the above description, according to the present invention, the first lens unit to the fourth lens unit are formed to have a convex-convex structure, and the first lens unit and the fourth lens unit are moved toward the object side along the optical axis. The second lens group, which is made of a positive meniscus lens having at least one convex surface facing the object side, is moved along the optical axis so as to correct the image plane fluctuation. , Compact 4 with good correction of aberration
It became possible to provide a group zoom lens.
第１図は本発明におけるコンパクトな高倍率４群ズーム
レンズの移動態様図、第２図は本発明のレンズ構成基本
形の各レンズ群を広角、望遠となしたときの各レンズの
配置図、第３図は第１実施例の収差曲線図、第４図は第
２実施例の収差曲線図である。 L1,L12:第１レンズないし第12レンズ X:光軸、S:絞り Ｐ′：結像位置 r1,r2,…r22:各レンズ面の曲率半径 d1,d2,…d21:各レンズの厚みまたは空気間隔FIG. 1 is a view showing the movement of a compact high-magnification four-unit zoom lens according to the present invention. FIG. 3 is an aberration curve diagram of the first embodiment, and FIG. 4 is an aberration curve diagram of the second embodiment. L 1 , L 12 : first to twelfth lenses X: optical axis, S: stop P ′: imaging position r 1 , r 2 ,... R 22 : radius of curvature d 1 , d 2 ,. d 21 : Thickness of each lens or air gap
Claims (1)
群、正の屈折力の第２レンズ群、正の屈折力の第３レン
ズ群、負の屈折力の第４レンズ群で構成し、広角端から
望遠端へのズーミングにさいし、第１レンズ群と第４レ
ンズ群は物体側へ一体に移動させ、第２レンズ群は像面
変動を補正するように移動させ、第３レンズ群は物体側
へ移動させるようにしたズームレンズであって、第１レ
ンズ群は少なくとも１つの正レンズと１つの負レンズと
からなり、第２レンズ群は少なくとも１つの物体側に凸
面を向けた正のメニスカスレンズからなり、第３レンズ
群は少なくとも１つの正レンズと１つの負レンズとから
なり、第４レンズ群は少なくとも１つの物体側に凹面を
向けた負レンズからなることを特徴とするコンパクトな
高倍率４群ズームレンズ。1. A first lens group having a positive refractive power, a second lens group having a positive refractive power, a third lens group having a positive refractive power, and a fourth lens group having a negative refractive power are arranged in this order from the object side. In zooming from the wide-angle end to the telephoto end, the first lens unit and the fourth lens unit are integrally moved toward the object side, and the second lens unit is moved so as to correct image plane variation. The first lens group includes at least one positive lens and one negative lens, and the second lens group has a convex surface facing at least one object side. The third lens group includes at least one positive lens and one negative lens, and the fourth lens group includes at least one negative lens having a concave surface facing the object side. Compact high-magnification 4-group zoom lens 'S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22177789A JP2784942B2 (en) | 1989-08-30 | 1989-08-30 | Compact high-magnification 4-group zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22177789A JP2784942B2 (en) | 1989-08-30 | 1989-08-30 | Compact high-magnification 4-group zoom lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0385508A JPH0385508A (en) | 1991-04-10 |
| JP2784942B2 true JP2784942B2 (en) | 1998-08-13 |
Family
ID=16772038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22177789A Expired - Fee Related JP2784942B2 (en) | 1989-08-30 | 1989-08-30 | Compact high-magnification 4-group zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2784942B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3260798B2 (en) * | 1991-03-04 | 2002-02-25 | オリンパス光学工業株式会社 | Wide-angle zoom lens |
| JP3262398B2 (en) * | 1993-02-25 | 2002-03-04 | キヤノン株式会社 | Small zoom lens |
| JPH0772392A (en) * | 1993-09-03 | 1995-03-17 | Olympus Optical Co Ltd | Highly variable power four-group zoom lens |
| JP4733361B2 (en) * | 2000-02-24 | 2011-07-27 | 新日本製鐵株式会社 | Engagement status confirmation method |
-
1989
- 1989-08-30 JP JP22177789A patent/JP2784942B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0385508A (en) | 1991-04-10 |
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