JP3292510B2 - Zoom lens - Google Patents

Zoom lens

Info

Publication number
JP3292510B2
JP3292510B2 JP21468492A JP21468492A JP3292510B2 JP 3292510 B2 JP3292510 B2 JP 3292510B2 JP 21468492 A JP21468492 A JP 21468492A JP 21468492 A JP21468492 A JP 21468492A JP 3292510 B2 JP3292510 B2 JP 3292510B2
Authority
JP
Japan
Prior art keywords
lens
lens group
focal length
zoom
wide
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
Application number
JP21468492A
Other languages
Japanese (ja)
Other versions
JPH0634885A (en
Inventor
誠二 清水
法彦 青木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Olympus Corp
Original Assignee
Olympus Optic Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Olympus Optic Co Ltd filed Critical Olympus Optic Co Ltd
Priority to JP21468492A priority Critical patent/JP3292510B2/en
Publication of JPH0634885A publication Critical patent/JPH0634885A/en
Application granted granted Critical
Publication of JP3292510B2 publication Critical patent/JP3292510B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • G02B15/145—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 five groups only
    • G02B15/1451—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 five groups only the first group being positive

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【産業上の利用分野】本発明は、広角から望遠までの広
い変倍域を有する小型な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 compact zoom lens having a wide zoom range from a wide angle to a telephoto.

【０００２】[0002]

【従来の技術】近年ズームレンズに対する需要がますま
す増大している。中でも広角から望遠までの広い変倍域
を有するズームレンズにおける需要が増え、更にこのよ
うなズームレンズに対する小型化の要求が強くなってい
る。2. Description of the Related Art In recent years, demand for zoom lenses has been increasing. In particular, the demand for a zoom lens having a wide zoom range from a wide angle to a telephoto is increasing, and the demand for miniaturization of such a zoom lens is increasing.

【０００３】小型化に関しては、不使用時に光学系を沈
胴させる等してレンズ系の全長を短くするメカ的手法が
多く用いられるが、レンズ系の外径に関してはこのよう
なメカ的手法を用いることが出来ず、そのため光学設計
によってレンズ系自体を小型化することが望まれる。In order to reduce the size, a mechanical method for shortening the overall length of the lens system by, for example, collapsing the optical system when not in use is often used. For the outer diameter of the lens system, such a mechanical method is used. Therefore, it is desired to reduce the size of the lens system itself by optical design.

【０００４】広角から望遠までの広い変倍域を有するズ
ームレンズの従来例として特公昭６１−４４２８８号公
報、特開昭６３−２９４５０６号公報に記載されたもの
が知られている。As conventional examples of zoom lenses having a wide zoom range from a wide angle to a telephoto, those described in JP-B-61-44288 and JP-A-63-294506 are known.

【０００５】上記従来例のうち、前者のズームレンズ
は、物体側より順に正，負，負，正，正の屈折力を有す
る五つのレンズ群にて構成されており、又後者のズーム
レンズは、物体側より順に正，負，正，正の屈折力を有
する四つのレンズ群にて構成されている。[0005] Among the above conventional examples, the former zoom lens is composed of five lens groups having positive, negative, negative, positive and positive refractive powers in order from the object side. And four lens groups having positive, negative, positive, and positive refractive powers in order from the object side.

【０００６】[0006]

【発明が解決しようとする課題】上記の従来例のうち、
特公昭６１−４４２８８号公報に記載されたズームレン
ズは、全系の焦点距離に対して絞りより前方に位置する
レンズ群（正，負，負の屈折力を有する三つのレンズ
群）の合成焦点距離の値（絶対値）が大でありこれらレ
ンズ群の合成のパワーが弱く、そのためにレンズ第１面
から入射瞳位置までの距離が遠くなり、その結果前玉径
が大きくなる。SUMMARY OF THE INVENTION Among the above conventional examples,
The zoom lens described in JP-B-61-44288 has a combined focus of a lens group (three lens groups having positive, negative, and negative refractive powers) located forward of the stop with respect to the focal length of the entire system. The value of the distance (absolute value) is large, and the combined power of these lens groups is weak, so that the distance from the first surface of the lens to the entrance pupil position is long, and as a result, the front lens diameter is large.

【０００７】また特開昭６３−２９４５０６号公報に記
載されたズームレンズは、負のレンズ群が一つしかない
ために、レンズ系を高変倍率にするためには、第２レン
ズ群である負のレンズ群のパワーを非常に強くしなけれ
ばならない。そのために、レンズ第１面から入射瞳位置
までの距離を近づけるために、全系の焦点距離に対して
絞りより前のレンズ群（正，負の屈折力を有する二つの
レンズ群）の合成焦点距離の値（絶対値）を更に小にし
てこれらレンズ群の合成のパワーを強くすることは出来
ない。更に第２レンズ群の負のパワーが非常に強いため
にペッツバール和を良好に補正することも困難になる。The zoom lens described in Japanese Patent Application Laid-Open No. 63-294506 has only one negative lens group. Therefore, in order to make the lens system have a high magnification, the zoom lens is a second lens group. The power of the negative lens group must be very strong. Therefore, in order to shorten the distance from the first lens surface to the entrance pupil position, the combined focal point of the lens units (two lens units having positive and negative refractive powers) before the stop with respect to the focal length of the entire system. It is not possible to further reduce the distance value (absolute value) to increase the combined power of these lens groups. Further, since the negative power of the second lens group is very strong, it is difficult to satisfactorily correct the Petzval sum.

【０００８】本発明は、第２レンズ群と第３レンズ群を
負の屈折力を有するレンズ群とすることによって、全系
の焦点距離に対しての絞りより前のレンズ群である第１
レンズ群，第２レンズ群，第３レンズ群の合成焦点距離
の値（絶対値）を小さくしてこれらレンズ群の合成のパ
ワーを強くしてレンズ第１面から入射瞳位置までの距離
を近くして前玉径を小さくしてレンズ系を小型としかつ
広角から望遠までの広い変倍域を有するズームレンズを
提供することを目的としている。According to the present invention, the second lens group and the third lens group are lens groups having a negative refractive power, so that the first lens group is located before the stop with respect to the focal length of the entire system.
The value (absolute value) of the combined focal length of the lens group, the second lens group, and the third lens group is reduced to increase the combined power of these lens groups, and the distance from the first lens surface to the entrance pupil position is reduced. It is another object of the present invention to provide a zoom lens having a small front lens diameter and a small lens system, and having a wide zoom range from wide angle to telephoto.

【０００９】[0009]

【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、正の屈折力を有する第１レンズ群
と、負の屈折力を有する第２レンズ群と、負の屈折力を
有する第３レンズ群と、前記第３レンズ群に続くレンズ
群が少なくとも一つの正のレンズ群とよりなり、第３レ
ンズ群よりも像側に明るさ絞りを有していて、次の条件
（１），（２）を満足する、広角端の焦点距離がイメー
ジサイズの対角線の長さよりも短い値であることを特徴
としている。 （１） ０．４＜｜ｆ123 ／ｆW ｜＜０．７ （２） ０．５＜ｆ2 ／ｆ3 ＜２．５ ただしｆW は広角端における全系の焦点距離、ｆ123 は
広角端における第１レンズ群，第２レンズ群，第３レン
ズ群の合成焦点距離、ｆ2 ，ｆ3 は夫々第２レンズ群，
第３レンズ群の焦点距離である。A zoom lens according to the present invention comprises, in order from the object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a negative refractive power. A third lens group, and a lens group following the third lens group include at least one positive lens group. The third lens group has a brightness stop closer to the image side than the third lens group. A feature is that the focal length at the wide-angle end that satisfies 1) and (2) is a value shorter than the length of the diagonal line of the image size. (1) 0.4 <| f 123 / f W | <0.7 (2) 0.5 <f 2 / f 3 <2.5 where f W is the focal length of the entire system at the wide-angle end, and f 123 is The combined focal length of the first lens group, the second lens group, and the third lens group at the wide angle end, f 2 and f 3 are the second lens group, respectively.
This is the focal length of the third lens group.

【００１０】条件（１）は、第１レンズ群から第３レン
ズ群までの広角端における合成焦点距離に関する条件
で、この条件（１）の上限を越えると収差補正上は有利
であるが、レンズ系の全長を維持しようとするとレンズ
第１面から入射瞳位置までの距離が遠くなり、前玉径が
大になり又レンズ系をコンパクトになし得ない。又下限
を越えると第１レンズ群から第３レンズ群までで発生す
る収差が大になり他のレンズ群では補正しきれなくな
る。The condition (1) is a condition relating to the combined focal length at the wide-angle end from the first lens unit to the third lens unit. If the upper limit of the condition (1) is exceeded, it is advantageous for aberration correction. In order to maintain the overall length of the system, the distance from the first surface of the lens to the entrance pupil position becomes long, the diameter of the front lens becomes large, and the lens system cannot be made compact. On the other hand, if the lower limit is exceeded, the aberration generated in the first lens unit to the third lens unit becomes large, and the other lens units cannot correct the aberration.

【００１１】条件（２）は、第２レンズ群と第３レンズ
群の焦点距離に関する条件で、下限を越えると収差補正
上は有利であるが条件（１）と同様に前玉径が大になり
レンズ系をコンパクトに出来ない。又上限を越えるとペ
ッツバール和の補正にとって好ましくなく負に大きくな
ってしまう。Condition (2) is a condition relating to the focal length of the second lens unit and the third lens unit. If the lower limit is exceeded, it is advantageous for aberration correction, but as in condition (1), the diameter of the front lens becomes large. The lens system cannot be made compact. On the other hand, if the value exceeds the upper limit, it becomes unfavorable for correction of Petzval sum and becomes negatively large.

【００１２】明るさ絞りは、像側に近くなる程前玉径の
増大をまねくため、本発明のレンズ系においては、第３
レンズ群に続くレンズ群（第４レンズ群）の物体側に位
置せしめることが望ましい。Since the aperture stop increases the diameter of the front lens as it approaches the image side, the lens system of the present invention has a third lens aperture.
It is desirable to position the lens group (fourth lens group) following the lens group on the object side.

【００１３】本発明において、第２レンズ群を少なくと
も２枚の負レンズと少なくとも１枚の正レンズで構成
し、又第３レンズ群を少なくとも１枚の負レンズで構成
することが好ましい。それは、前述のように広角から望
遠までの広い変倍域を有していて、かつコンパクトにす
るためには、第２レンズ群と第３レンズ群に比較的強い
パワーを持たせることが必要である。そこで前記のよう
に、第２レンズ群を負レンズ，負レンズ，正レンズを基
本にした構成とし、第３レンズ群を負レンズ１枚もしく
は負レンズと正レンズの接合レンズで構成することによ
り、必要以上にパワーを強くすることなしに高変倍率で
コンパクトになし得るパワー配置が可能になる。In the present invention, it is preferable that the second lens group comprises at least two negative lenses and at least one positive lens, and the third lens group comprises at least one negative lens. It has a wide zoom range from wide-angle to telephoto as described above, and in order to make it compact, it is necessary that the second lens group and the third lens group have relatively strong power. is there. Therefore, as described above, the second lens group is configured based on a negative lens, a negative lens, and a positive lens, and the third lens group is configured by one negative lens or a cemented lens of a negative lens and a positive lens. A power arrangement that can be made compact at a high magnification ratio without increasing the power more than necessary becomes possible.

【００１４】本発明において、第２レンズ群を３枚のレ
ンズにて構成し又第３レンズ群を１枚又は２枚のレンズ
にて構成して必要以上にレンズ枚数を増やすことをさけ
ているが、必ずしもレンズ枚数を制限するものではな
く、条件（１），（２）を満足するパワー配置であれば
よい。In the present invention, the second lens group is constituted by three lenses, and the third lens group is constituted by one or two lenses to avoid increasing the number of lenses more than necessary. However, the number of lenses is not necessarily limited, and any power arrangement that satisfies the conditions (1) and (2) may be used.

【００１５】次に本発明のレンズ系において下記の条件
（３），（４）を満足すれば更に望ましい。 （３） ０．８＜｜ｆ2 ／ｆW ｜＜２．０ （４） ０．５＜｜ｆ3 ／ｆW ｜＜１．５ 条件（３）は第２レンズ群の焦点距離に関するものであ
り、この条件の上限を越えると第２レンズ群の構成長が
長くなり、レンズ系のコンパクト化に反する。又下限を
越えると第２レンズ群で発生する収差が大になり他の群
で補正しきれなくなる。Next, it is more desirable that the following conditions (3) and (4) be satisfied in the lens system of the present invention. (3) 0.8 <| f 2 / f W | <2.0 (4) 0.5 <| f 3 / f W | <1.5 Condition (3) is related to the focal length of the second lens group If the upper limit of this condition is exceeded, the configuration length of the second lens unit becomes long, which is against the compactness of the lens system. On the other hand, if the lower limit is exceeded, the aberration generated in the second lens group becomes so large that it cannot be corrected by other groups.

【００１６】条件（４）は、第３レンズ群の焦点距離に
関する条件であり、上限を越えると収差補正上は有利で
あるがレンズ系のコンパクト化にとっては好ましくな
い。又下限を越えると第３レンズ群で発生する収差が大
になり、他のレンズ群で補正しきれなくなり好ましくな
く、又ペッツバール和の補正にとっても好ましくない。The condition (4) is a condition relating to the focal length of the third lens unit. Exceeding the upper limit is advantageous for aberration correction but is not preferable for downsizing the lens system. If the lower limit is exceeded, the aberration generated in the third lens group becomes too large to be corrected by the other lens groups, which is not preferable, and is also not preferable for correcting Petzval sum.

【００１７】尚本発明のズームレンズは、第１レンズ群
と第２レンズ群と、第３レンズ群の夫々が広角端より望
遠端にかけて像面からの距離が遠くなるように移動す
る。In the zoom lens of the present invention, each of the first lens unit, the second lens unit, and the third lens unit moves from the wide-angle end to the telephoto end such that the distance from the image plane increases.

【００１８】[0018]

【実施例】本発明のズームレンズの各実施例を示すと次
の通りである。 実施例１ ｆ＝36.2〜72.0〜144.7(mm) ，Ｆナンバー＝4.65〜5.2 〜5.82 ２ω＝64.4°〜16.4° ｒ1 ＝135.0634 ｄ1 ＝1.800 ｎ1 ＝1.80518 ν1 ＝25.43 ｒ2 ＝57.5717 ｄ2 ＝5.176 ｎ2 ＝1.51454 ν2 ＝54.69 ｒ3 ＝-146.9974 ｄ3 ＝0.150 ｒ4 ＝37.8394 ｄ4 ＝3.500 ｎ3 ＝1.48749 ν3 ＝70.20 ｒ5 ＝103.2220 ｄ5 ＝（可変） ｒ6 ＝114.8204 ｄ6 ＝1.126 ｎ4 ＝1.78590 ν4 ＝44.18 ｒ7 ＝16.9157 ｄ7 ＝5.054 ｒ8 ＝-44.8023 ｄ8 ＝1.000 ｎ5 ＝1.72000 ν5 ＝50.25 ｒ9 ＝89.0898 ｄ9 ＝0.150 ｒ10＝30.0706 ｄ10＝3.200 ｎ6 ＝1.84666 ν6 ＝23.78 ｒ11＝-79.4034 ｄ11＝（可変） ｒ12＝-28.5476 ｄ12＝0.938 ｎ7 ＝1.72000 ν7 ＝50.25 ｒ13＝184.5187 ｄ13＝（可変） ｒ14＝∞（絞り） ｄ14＝1.264 ｒ15＝64.2344 （非球面）ｄ15＝3.067 ｎ8 ＝1.51823 ν8 ＝58.96 ｒ16＝-65.4067 ｄ16＝0.150 ｒ17＝21.0508 ｄ17＝5.368 ｎ9 ＝1.51823 ν9 ＝58.96 ｒ18＝-29.8957 ｄ18＝0.675 ｒ19＝-37.9839 ｄ19＝1.100 ｎ10＝1.75520 ν10＝27.51 ｒ20＝52.9432 ｄ20＝（可変） ｒ21＝165.8021 ｄ21＝3.700 ｎ11＝1.53172 ν11＝48.90 ｒ22＝-25.4081 ｄ22＝0.150 ｒ23＝53.3261 ｄ23＝3.714 ｎ12＝1.53172 ν12＝48.90 ｒ24＝-53.8729 ｄ24＝1.864 ｒ25＝-20.3310 ｄ25＝1.000 ｎ13＝1.74400 ν13＝44.73 ｒ26＝320.4548 非球面係数 Ｅ＝-0.16080×10-4，Ｆ＝-0.35191×10-7，Ｇ＝-0.513
25×10-10 Ｈ＝-0.17305×10-11 ｆ 36.2 72.0 144.7 ｄ5 1.0000 16.5161 31.5705 ｄ11 3.6532 3.0000 2.1000 ｄ13 16.6385 8.9035 1.6206 ｄ20 12.4603 10.0254 9.2782 ｆ123 ／ｆW ＝-0.684，ｆ2 ／ｆ3 ＝1.472 ，ｆ2 ／ｆ
W ＝-1.393 ｆ3 ／ｆW ＝-0.946DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the zoom lens according to the present invention are as follows. Example 1 f = 36.2 to 72.0 to 144.7 (mm), F-number = 4.65 to 5.2 to 5.82 2ω = 64.4 ° to 16.4 ° r 1 = 135.0634 d 1 = 1.800 n 1 = 1.805518 ν 1 = 25.43 r 2 = 57.5717 d 2 = 5.176 n 2 = 1.51454 ν 2 = 54.69 r 3 = -146.9974 d 3 = 0.150 r 4 = 37.8394 d 4 = 3.500 n 3 = 1.48749 ν 3 = 70.20 r 5 = 103.2220 d 5 = ( variable) r 6 = 114.8204 d 6 = 1.126 n 4 = 1.78590 ν 4 = 44.18 r 7 = 16.9157 d 7 = 5.054 r 8 = −44.8023 d 8 = 1.000 n 5 = 1.72000 ν 5 = 50.25 r 9 = 89.0898 d 9 = 0.150 r 10 = 30.0706 d 10 = 3.200 n 6 = 1.84666 v 6 = 23.78 r 11 = -79.4034 d 11 = (variable) r 12 = -28.5476 d 12 = 0.938 n 7 = 1.72000 v 7 = 50.25 r 13 = 184.5187 d 13 = (variable) r 14 = ∞ (aperture) d 14 = 1.264 r 15 = 64.2344 (aspherical surface) d 15 = 3.067 n 8 = 1.51823 ν 8 = 58.96 r 16 = -65.4067 d 16 = 0.150 r 17 = 21.0508 d 17 = 5.368 n 9 = 1.51823 ν 9 = 58.96 r 18 = -29.8957 d 18 = 0.675 r 19 = -37.9839 d 19 = 1.100 n 10 = 1.75520 ν 10 = 27.51 r 20 = 52.9432 d 20 = ( Variable) r 21 = 165.8021 d 21 = 3.700 n 11 = 1.53172 ν 11 = 48.90 r 22 = -25.4081 d 22 = 0.150 r 23 = 53.3261 d 23 = 3.714 n 12 = 1.53172 v 12 = 48.90 r 24 = -53.8729 d 24 = 1.864 r 25 = -20.3310 d 25 = 1.000 n 13 = 1.74400 v 13 = 44.73 r 26 = 320.4548 Aspherical surface coefficient E = -0.16080 × 10 -4 , F = -0.35191 × 10 -7 , G = -0.513
25 × 10 −10 H = −0.17305 × 10 −11 f 36.2 72.0 144.7 d 5 1.0000 16.5161 31.5705 d 11 3.6532 3.0000 2.1000 d 13 16.6385 8.9035 1.6206 d 20 12.4603 10.0254 9.2782 f 123 / f W = -0.684, f 2 / f 3 = 1.472, f 2 / f
W = -1.393 f 3 / f W = -0.946

【００１９】実施例２ ｆ＝36.2〜72.0〜144.7(mm) ，Ｆナンバー＝4.65〜5.23〜5.82 ２ω＝64.8°〜16.4° ｒ1 ＝136.2298 ｄ1 ＝1.800 ｎ1 ＝1.80518 ν1 ＝25.43 ｒ2 ＝60.8927 ｄ2 ＝6.452 ｎ2 ＝1.51823 ν2 ＝58.96 ｒ3 ＝-199.1070 ｄ3 ＝0.150 ｒ4 ＝38.4778 ｄ4 ＝4.650 ｎ3 ＝1.48749 ν3 ＝70.20 ｒ5 ＝158.4838 ｄ5 ＝（可変） ｒ6 ＝92.9655 ｄ6 ＝1.126 ｎ4 ＝1.78590 ν4 ＝44.18 ｒ7 ＝14.5214 ｄ7 ＝4.503 ｒ8 ＝-37.0792 ｄ8 ＝1.009 ｎ5 ＝1.72916 ν5 ＝54.68 ｒ9 ＝470.0604 ｄ9 ＝0.150 ｒ10＝23.4576 ｄ10＝3.200 ｎ6 ＝1.84666 ν6 ＝23.78 ｒ11＝-277.1253 ｄ11＝（可変） ｒ12＝-27.5292 ｄ12＝0.938 ｎ7 ＝1.72916 ν7 ＝54.68 ｒ13＝66.9858 ｄ13＝（可変） ｒ14＝∞（絞り） ｄ14＝1.264 ｒ15＝20.1832 （非球面）ｄ15＝7.800 ｎ8 ＝1.51633 ν8 ＝64.15 ｒ16＝-17.1385 ｄ16＝0.489 ｒ17＝-16.2233 ｄ17＝1.100 ｎ9 ＝1.84666 ν9 ＝23.78 ｒ18＝-28.8900 ｄ18＝（可変） ｒ19＝108.8942 ｄ19＝4.209 ｎ10＝1.54814 ν10＝45.78 ｒ20＝-24.9808 ｄ20＝0.150 ｒ21＝38.3388 ｄ21＝2.789 ｎ11＝1.51823 ν11＝58.96 ｒ22＝-69.0829 ｄ22＝1.724 ｒ23＝-21.4624 ｄ23＝1.000 ｎ12＝1.74400 ν12＝44.73 ｒ24＝66.0427 非球面係数 Ｅ＝-0.23923×10-4，Ｆ＝0.20560 ×10-7，Ｇ＝-0.708
43×10-10 Ｈ＝-0.81297×10-13 ｆ 36.2 72.0 144.7 ｄ5 1.0000 16.1506 30.1437 ｄ11 5.3190 3.0000 2.1000 ｄ13 12.0020 6.7427 1.7000 ｄ18 12.1450 8.7288 8.4515 ｆ123 ／ｆW ＝-0.545，ｆ2 ／ｆ3 ＝1.721 ，ｆ2 ／ｆ
W ＝-1.267 ｆ3 ／ｆW ＝-0.736Example 2 f = 36.2 to 72.0 to 144.7 (mm), F-number = 4.65 to 5.23 to 5.82 2ω = 64.8 ° to 16.4 ° r 1 = 136.2298 d 1 = 1.800 n 1 = 1.80518 ν 1 = 25.43 r 2 = 60.8927 d 2 = 6.452 n 2 = 1.51823 v 2 = 58.96 r 3 = -199.1070 d 3 = 0.150 r 4 = 38.4778 d 4 = 4.650 n 3 = 1.48749 v 3 = 70.20 r 5 = 158.4838 d 5 = (variable) r 6 = 92.9655 d 6 = 1.126 n 4 = 1.78590 ν 4 = 44.18 r 7 = 14.5214 d 7 = 4.503 r 8 = -37.0792 d 8 = 1.009 n 5 = 1.72916 ν 5 = 54.68 r 9 = 470.0604 d 9 = 0.150 r 10 = 23.4576 d 10 = 3.200 n 6 = 1.84666 ν 6 = 23.78 r 11 = -277.1253 d 11 = ( variable) r 12 = -27.5292 d 12 = 0.938 n 7 = 1.72916 ν 7 = 54.68 r 13 = 66.9858 d 13 = ( Variable) r 14 = 14 (aperture) d 14 = 1.264 r 15 = 20.1832 (aspherical surface) d 15 = 7.800 n 8 = 1.51633 ν 8 = 64.15 r 16 = -17.1385 d 16 = 0.489 r 17 = -16.2233 d 17 = 1.100 n 9 = 1.8 4666 v 9 = 23.78 r 18 = -28.8900 d 18 = (variable) r 19 = 108.8942 d 19 = 4.209 n 10 = 1.54814 v 10 = 45.78 r 20 = -24.9808 d 20 = 0.150 r 21 = 38.3388 d 21 = 2.789 n 11 = 1.51823 ν 11 = 58.96 r 22 = -69.0829 d 22 = 1.724 r 23 = -21.4624 d 23 = 1.000 n 12 = 1.74400 ν 12 = 44.73 r 24 = 66.0427 Aspheric coefficient E = -0.23923 × 10 -4 , F = 0.20560 × 10 -7 , G = -0.708
43 × 10 −10 H = −0.81297 × 10 −13 f 36.2 72.0 144.7 d 5 1.0000 16.1506 30.1437 d 11 5.3190 3.0000 2.1000 d 13 12.0020 6.7427 1.7000 d 18 12.1450 8.7288 8.4515 f 123 / f W = −0.545, f 2 / f 3 = 1.721, f 2 / f
W = -1.267 f 3 / f W = -0.736

【００２０】実施例３ ｆ＝36.0〜69.0〜132.0(mm) ，Ｆナンバー＝4.64〜5.17〜5.77 ２ω＝64.8°〜18.2° ｒ1 ＝110.8320 ｄ1 ＝1.841 ｎ1 ＝1.84666 ν1 ＝23.78 ｒ2 ＝60.4142 ｄ2 ＝6.670 ｎ2 ＝1.56873 ν2 ＝63.16 ｒ3 ＝-248.3924 ｄ3 ＝0.150 ｒ4 ＝36.7380 ｄ4 ＝4.968 ｎ3 ＝1.48749 ν3 ＝70.20 ｒ5 ＝85.1195 ｄ5 ＝（可変） ｒ6 ＝61.0088 ｄ6 ＝1.100 ｎ4 ＝1.74400 ν4 ＝44.73 ｒ7 ＝13.4686 ｄ7 ＝3.867 ｒ8 ＝-53.5337 ｄ8 ＝1.009 ｎ5 ＝1.72916 ν5 ＝54.68 ｒ9 ＝45.4434 ｄ9 ＝0.150 ｒ10＝22.6679 ｄ10＝3.500 ｎ6 ＝1.84666 ν6 ＝23.78 ｒ11＝8661.6505 ｄ11＝（可変） ｒ12＝-21.4579 ｄ12＝0.938 ｎ7 ＝1.61272 ν7 ＝58.75 ｒ13＝1176.9408 ｄ13＝（可変） ｒ14＝∞（絞り） ｄ14＝1.264 ｒ15＝21.6237 （非球面）ｄ15＝5.451 ｎ8 ＝1.51823 ν8 ＝58.96 ｒ16＝-18.4111 ｄ16＝0.489 ｒ17＝-16.9059 ｄ17＝1.081 ｎ9 ＝1.80518 ν9 ＝25.43 ｒ18＝-28.7266 ｄ18＝（可変） ｒ19＝2050.2215 ｄ19＝3.823 ｎ10＝1.56873 ν10＝63.16 ｒ20＝-24.3052 ｄ20＝0.150 ｒ21＝54.6882 ｄ21＝2.589 ｎ11＝1.51454 ν11＝54.69 ｒ22＝-42.5542 ｄ22＝1.386 ｒ23＝-20.9442 ｄ23＝1.000 ｎ12＝1.79952 ν12＝42.24 ｒ24＝-2308.3645 非球面係数 Ｅ＝-0.19817×10-4，Ｆ＝0.26588 ×10-7，Ｇ＝-0.215
89×10-10 Ｈ＝0.63785 ×10-12 ｆ 36.0 69.0 132.0 ｄ5 1.0000 15.8333 29.8505 ｄ11 4.5301 3.0000 2.0000 ｄ13 10.7221 5.7096 1.0000 ｄ18 13.6725 11.0762 9.7159 ｆ123 ／ｆW ＝-0.561，ｆ2 ／ｆ3 ＝0.890 ，ｆ2 ／ｆ
W ＝-0.850 ｆ3 ／ｆW ＝-0.955Example 3 f = 36.0 to 69.0 to 132.0 (mm), F number = 4.64 to 5.17 to 5.77 2ω = 64.8 ° to 18.2 ° r 1 = 110.8320 d 1 = 1.841 n 1 = 1.84666 ν 1 = 23.78 r 2 = 60.4142 d 2 = 6.670 n 2 = 1.56873 ν 2 = 63.16 r 3 = -248.3924 d 3 = 0.150 r 4 = 36.7380 d 4 = 4.968 n 3 = 1.48749 ν 3 = 70.20 r 5 = 85.1195 d 5 = ( variable) r 6 = 61.0088 d 6 = 1.100 n 4 = 1.74400 ν 4 = 44.73 r 7 = 13.4686 d 7 = 3.867 r 8 = -53.5337 d 8 = 1.009 n 5 = 1.72916 ν 5 = 54.68 r 9 = 45.4434 d 9 = 0.150 r 10 = 22.6679 d 10 = 3.500 n 6 = 1.84666 ν 6 = 23.78 r 11 = 8661.6505 d 11 = ( variable) r 12 = -21.4579 d 12 = 0.938 n 7 = 1.61272 ν 7 = 58.75 r 13 = 1176.9408 d 13 = ( variable ) R 14 = ∞ (aperture) d 14 = 1.264 r 15 = 21.6237 (aspheric surface) d 15 = 5.451 n 8 = 1.51823 ν 8 = 58.96 r 16 = -18.4111 d 16 = 0.489 r 17 = -16.9059 d 17 = 1.081 n 9 = 1.8 Ν 9 = 25.43 r 18 = -28.7266 d 18 = (variable) r 19 = 2050.2215 d 19 = 3.823 n 10 = 1.56873 ν 10 = 63.16 r 20 = -24.3052 d 20 = 0.150 r 21 = 54.6882 d 21 = 2.589 n 11 = 1.51454 ν 11 = 54.69 r 22 = -42.5542 d 22 = 1.386 r 23 = -20.9442 d 23 = 1.000 n 12 = 1.79952 ν 12 = 42.24 r 24 = -2308.3645 aspherical coefficient E = -0.19817 × 10 -4, F = 0.26588 × 10 -7 , G = -0.215
89 × 10 −10 H = 0.63785 × 10 −12 f 36.0 69.0 132.0 d 5 1.0000 15.8333 29.8505 d 11 4.5301 3.0000 2.0000 d 13 10.7221 5.7096 1.0000 d 18 13.6725 11.0762 9.7159 f 123 / f W = -0.561, f 2 / f 3 = 0.890, f 2 / f
W = -0.850 f 3 / f W = -0.955

【００２１】実施例４ ｆ＝36.0〜68.9〜132.3(mm) ，Ｆナンバー＝4.57〜4.99〜5.63 ２ω＝64.2°〜18.2° ｒ1 ＝162.0377 ｄ1 ＝1.800 ｎ1 ＝1.75520 ν1 ＝27.51 ｒ2 ＝63.4918 ｄ2 ＝6.204 ｎ2 ＝1.56873 ν2 ＝63.16 ｒ3 ＝-229.7188 ｄ3 ＝0.150 ｒ4 ＝37.5943 ｄ4 ＝4.835 ｎ3 ＝1.49700 ν3 ＝81.61 ｒ5 ＝144.3417 ｄ5 ＝（可変） ｒ6 ＝150.3454 ｄ6 ＝1.500 ｎ4 ＝1.74400 ν4 ＝44.73 ｒ7 ＝16.4889 ｄ7 ＝5.145 ｒ8 ＝-70.3042 ｄ8 ＝1.000 ｎ5 ＝1.71300 ν5 ＝53.84 ｒ9 ＝82.4222 ｄ9 ＝0.150 ｒ10＝26.0475 ｄ10＝2.801 ｎ6 ＝1.75520 ν6 ＝27.51 ｒ11＝-499.8712 ｄ11＝（可変） ｒ12＝-27.0142 ｄ12＝1.000 ｎ7 ＝1.72916 ν7 ＝54.68 ｒ13＝32.3365 ｄ13＝1.804 ｎ8 ＝1.80518 ν8 ＝25.43 ｒ14＝134.1453 ｄ14＝（可変） ｒ15＝∞（絞り） ｄ15＝1.001 ｒ16＝28.2861 ｄ16＝2.803 ｎ9 ＝1.71300 ν9 ＝53.84 ｒ17＝-79.4593 ｄ17＝0.150 ｒ18＝33.5308 ｄ18＝2.735 ｎ10＝1.50378 ν10＝66.81 ｒ19＝-66.5243 ｄ19＝0.800 ｒ20＝-36.6832 ｄ20＝1.006 ｎ11＝1.80518 ν11＝25.43 ｒ21＝135.1219 ｄ21＝（可変） ｒ22＝26.9611 ｄ22＝5.132 ｎ12＝1.48749 ν12＝70.20 ｒ23＝-23.4070 ｄ23＝0.255 ｒ24＝-135.2773(非球面）ｄ24＝0.200 ｎ13＝1.52538 ν13＝51.51 ｒ25＝-82.5891 ｄ25＝2.391 ｎ14＝1.74100 ν14＝52.68 ｒ26＝33.0527 ｄ26＝（可変） ｒ27＝29.7751 ｄ27＝3.600 ｎ15＝1.59270 ν15＝35.29 ｒ28＝41.2971 ｄ28＝3.000 ｒ29＝-64.4458 ｄ29＝1.250 ｎ16＝1.74100 ν16＝52.68 ｒ30＝∞ 非球面係数 Ｅ＝-0.68628×10-4，Ｆ＝-0.15067×10-6，Ｇ＝0.4242
4 ×10-9 Ｈ＝-0.15769×10-11 ｆ 36.0 68.9 132.3 ｄ5 0.7000 15.1180 25.3410 ｄ11 5.0000 1.5000 2.0000 ｄ14 13.6069 7.5540 1.1010 ｄ21 8.3798 5.4210 3.7620 ｄ26 0.6001 11.4350 25.3450 ｆ123 ／ｆW ＝-0.630，ｆ2 ／ｆ3 ＝1.239 ，ｆ2 ／ｆ
W ＝-1.116 ｆ3 ／ｆW ＝-0.900Example 4 f = 36.0 to 68.9 to 132.3 (mm), F number = 4.57 to 4.99 to 5.63 2ω = 64.2 ° to 18.2 ° r 1 = 162.0377 d 1 = 1.800 n 1 = 1.75520 ν 1 = 27.51 r 2 = 63.4918 d 2 = 6.204 n 2 = 1.56873 ν 2 = 63.16 r 3 = -229.7188 d 3 = 0.150 r 4 = 37.5943 d 4 = 4.835 n 3 = 1.49700 ν 3 = 81.61 r 5 = 144.3417 d 5 = ( variable) r 6 = 150.3454 d 6 = 1.500 n 4 = 1.74400 ν 4 = 44.73 r 7 = 16.4889 d 7 = 5.145 r 8 = -70.3042 d 8 = 1.000 n 5 = 1.71300 ν 5 = 53.84 r 9 = 82.4222 d 9 = 0.150 r 10 = 26.0475 d 10 = 2.801 n 6 = 1.75520 ν 6 = 27.51 r 11 = -499.8712 d 11 = ( variable) r 12 = -27.0142 d 12 = 1.000 n 7 = 1.72916 ν 7 = 54.68 r 13 = 32.3365 d 13 = 1.804 n 8 = 1.80518 ν 8 = 25.43 r 14 = 134.1453 d 14 = ( variable) r 15 = ∞ (stop) d 15 = 1.001 r 16 = 28.2861 d 16 = 2.803 n 9 = 1.71300 ν 9 = 53.84 r 17 = -79.4593 d 17 = 0. 150 r 18 = 33.5308 d 18 = 2.735 n 10 = 1.50378 v 10 = 66.81 r 19 = -66.5243 d 19 = 0.800 r 20 = -36.6832 d 20 = 1.006 n 11 = 1.805518 v 11 = 25.43 r 21 = 135.1219 d 21 = (variable) r 22 = 26.9611 d 22 = 5.132 n 12 = 1.48749 ν 12 = 70.20 r 23 = -23.4070 d 23 = 0.255 r 24 = -135.2773 ( aspherical) d 24 = 0.200 n 13 = 1.52538 ν 13 = 51.51 r 25 = -82.5891 d 25 = 2.391 n 14 = 1.74100 v 14 = 52.68 r 26 = 33.0527 d 26 = (variable) r 27 = 29.7751 d 27 = 3.600 n 15 = 1.59270 v 15 = 35.29 r 28 = 41.2971 d 28 = 3.000 r 29 = -64.4458 d 29 = 1.250 n 16 = 1.74100 ν 16 = 52.68 r 30 = ∞ Aspherical coefficient E = −0.68628 × 10 −4 , F = −0.15067 × 10 −6 , G = 0.4242
4 × 10 −9 H = −0.15769 × 10 −11 f 36.0 68.9 132.3 d 5 0.7000 15.1180 25.3410 d 11 5.0000 1.5000 2.0000 d 14 13.6069 7.5540 1.1010 d 21 8.3798 5.4210 3.7620 d 26 0.6001 11.4350 25.3450 f 123 / f W = −0.630 , f 2 / f 3 = 1.239 , f 2 / f
W = -1.116 f 3 / f W = -0.900

【００２２】実施例５ ｆ＝36.0〜68.9〜132.3(mm) ，Ｆナンバー＝4.57〜4.99〜5.63 ２ω＝64.2°〜18.2° ｒ1 ＝144.3570 ｄ1 ＝1.800 ｎ1 ＝1.80518 ν1 ＝25.43 ｒ2 ＝60.0074 ｄ2 ＝6.204 ｎ2 ＝1.56873 ν2 ＝63.16 ｒ3 ＝-200.8299 ｄ3 ＝0.150 ｒ4 ＝34.9463 ｄ4 ＝5.153 ｎ3 ＝1.48749 ν3 ＝70.20 ｒ5 ＝88.5294 ｄ5 ＝（可変） ｒ6 ＝68.8923 ｄ6 ＝1.500 ｎ4 ＝1.74400 ν4 ＝44.73 ｒ7 ＝15.7680 ｄ7 ＝5.195 ｒ8 ＝-47.8179 ｄ8 ＝1.000 ｎ5 ＝1.71300 ν5 ＝53.84 ｒ9 ＝71.9770 ｄ9 ＝0.150 ｒ10＝25.6867 ｄ10＝2.801 ｎ6 ＝1.84666 ν6 ＝23.78 ｒ11＝-133.7183 ｄ11＝（可変） ｒ12＝-27.5856 ｄ12＝1.000 ｎ7 ＝1.72916 ν7 ＝54.68 ｒ13＝74.8095 ｄ13＝（可変） ｒ14＝∞（絞り） ｄ14＝1.001 ｒ15＝28.4032 ｄ15＝2.803 ｎ8 ＝1.71300 ν8 ＝53.84 ｒ16＝-85.7466 ｄ16＝0.150 ｒ17＝33.5006 ｄ17＝2.736 ｎ9 ＝1.50378 ν9 ＝66.81 ｒ18＝-61.2293 ｄ18＝0.800 ｒ19＝-35.8214 ｄ19＝1.006 ｎ10＝1.80518 ν10＝25.43 ｒ20＝103.3033 ｄ20＝（可変） ｒ21＝27.5770 ｄ21＝5.085 ｎ11＝1.51823 ν11＝58.96 ｒ22＝-23.6102 ｄ22＝0.251 ｒ23＝-127.7557(非球面）ｄ23＝0.200 ｎ12＝1.52538 ν12＝51.51 ｒ24＝-87.0349 ｄ24＝1.649 ｎ13＝1.74100 ν13＝52.68 ｒ25＝44.5426 ｄ25＝（可変） ｒ26＝-57.0987 ｄ26＝1.250 ｎ14＝1.72916 ν14＝54.68 ｒ27＝-155.1928 非球面係数 Ｅ＝-0.65304×10-4，Ｆ＝-0.13248×10-6，Ｇ＝0.1713
6 ×10-9 Ｈ＝-0.50521×10-12 ｆ 36.0 68.9 132.3 ｄ5 0.5506 14.7860 25.3890 ｄ11 2.8927 2.0430 2.0320 ｄ13 15.3541 7.7780 1.1010 ｄ21 8.3919 5.4260 3.7440 ｄ25 8.0325 18.2950 30.8150 ｆ123 ／ｆW ＝-0.660，ｆ2 ／ｆ3 ＝2.093 ，ｆ2 ／ｆ
W ＝-1.600 ｆ3 ／ｆW ＝-0.764 ただしｒ1 ，ｒ2 ，・・・ は各レンズ面の曲率半径、ｄ
1 ，ｄ2 ，・・・ は各レンズの肉厚およびレンズ間隔、ｎ
1 ，ｎ2 ，・・・ は各レンズの屈折率、ν1 ，ν2 ，・・・
は各レンズのアッベ数である。Example 5 f = 36.0 to 68.9 to 132.3 (mm), F number = 4.57 to 4.99 to 5.63 2ω = 64.2 ° to 18.2 ° r 1 = 144.3570 d 1 = 1.800 n 1 = 1.80518 ν 1 = 25.43 r 2 = 60.0074 d 2 = 6.204 n 2 = 1.56873 ν 2 = 63.16 r 3 = -200.8299 d 3 = 0.150 r 4 = 34.9463 d 4 = 5.153 n 3 = 1.48749 ν 3 = 70.20 r 5 = 88.5294 d 5 = ( variable) r 6 = 68.8923 d 6 = 1.500 n 4 = 1.74400 ν 4 = 44.73 r 7 = 15.7680 d 7 = 5.195 r 8 = -47.8179 d 8 = 1.000 n 5 = 1.71300 ν 5 = 53.84 r 9 = 71.9770 d 9 = 0.150 r 10 = 25.6867 d 10 = 2.801 n 6 = 1.84666 ν 6 = 23.78 r 11 = -133.7183 d 11 = ( variable) r 12 = -27.5856 d 12 = 1.000 n 7 = 1.72916 ν 7 = 54.68 r 13 = 74.8095 d 13 = ( Variable) r 14 = ∞ (aperture) d 14 = 1.001 r 15 = 28.4032 d 15 = 2.803 n 8 = 1.71300 ν 8 = 53.84 r 16 = -85.7466 d 16 = 0.150 r 17 = 33.5006 d 17 = 2.736 n 9 = 1.50378 ν 9 = 66.81 r 18 = -61.2293 d 18 = 0.800 r 19 = -35.8214 d 19 = 1.006 n 10 = 1.80518 ν 10 = 25.43 r 20 = 103.3033 d 20 = ( Variable) r 21 = 27.5770 d 21 = 5.085 n 11 = 1.51823 ν 11 = 58.96 r 22 = -23.6102 d 22 = 0.251 r 23 = -127.7557 (aspherical surface) d 23 = 0.200 n 12 = 1.52538 ν 12 = 51.51 r 24 = -87.0349 d 24 = 1.649 n 13 = 1.74100 ν 13 = 52.68 r 25 = 44.5426 d 25 = (variable) r 26 = -57.0987 d 26 = 1.250 n 14 = 1.72916 ν 14 = 54.68 r 27 = -155.1928 aspherical coefficient E = -0.65304 × 10 -4, F = -0.13248 × 10 - 6 , G = 0.1713
6 × 10 -9 H = -0.50521 × 10 -12 f 36.0 68.9 132.3 d 5 0.5506 14.7860 25.3890 d 11 2.8927 2.0430 2.0320 d 13 15.3541 7.7780 1.1010 d 21 8.3919 5.4260 3.7440 d 25 8.0325 18.2950 30.8150 f 123 / f W = -0.660 , F 2 / f 3 = 2.093, f 2 / f
W = −1.600 f 3 / f W = −0.764 where r 1 , r 2 ,... Are the radius of curvature of each lens surface, d
.. , D 2 ,...
1 , n 2 ,... Are the refractive indices of each lens, ν 1 , ν 2 ,.
Is the Abbe number of each lens.

【００２３】前記実施例１〜５は夫々図１〜５にて示す
通りの構成である。The first to fifth embodiments have the constructions as shown in FIGS.

【００２４】実施例１および実施例２は第４レンズ群と
第５レンズ群が一体に移動してフォーカシングを行なう
が、第１レンズ群，第２レンズ群，第３レンズ群を一体
に移動させてフォーカシングを行なうことも可能であ
る。In the first and second embodiments, the fourth lens unit and the fifth lens unit move together to perform focusing, but the first lens unit, the second lens unit, and the third lens unit are moved together. Focusing is also possible.

【００２５】又実施例３，実施例４，実施例５は、第１
レンズ群，第２レンズ群，第３レンズ群を一体に移動さ
せてフォーカシングを行なう。しかし第４レンズ群と第
５レンズ群とを一体に移動させてフォーカシングを行な
うことも可能である。The third, fourth, and fifth embodiments are similar to the first embodiment.
Focusing is performed by moving the lens group, the second lens group, and the third lens group together. However, it is also possible to perform focusing by moving the fourth lens group and the fifth lens group integrally.

【００２６】又これら実施例で用いる非球面形状は、光
軸方向をｘ軸、光軸に垂直な方向をｙ軸とした時、次の
式で表わされる。 The aspherical shape used in these embodiments is represented by the following equation when the optical axis direction is the x axis and the direction perpendicular to the optical axis is the y axis.

【００２７】ただしｒは基準球面の屈折率半径、Ｅ，
Ｆ，Ｇ，Ｈ，・・・は非球面係数である。Where r is the refractive index radius of the reference spherical surface, E,
F, G, H,... Are aspherical coefficients.

【００２８】[0028]

【発明の効果】本発明は、広角端での画角が広くしかも
広角端から望遠端までの変倍域が広く、前玉径の小さい
小型なズームレンズを達成し得るものである。According to the present invention, a compact zoom lens having a wide angle of view at the wide-angle end, a wide zoom range from the wide-angle end to the telephoto end, and a small front lens diameter can be achieved.

【図面の簡単な説明】[Brief description of the drawings]

【図１】実施例１の断面図FIG. 1 is a cross-sectional view of a first embodiment.

【図２】実施例２の断面図FIG. 2 is a sectional view of a second embodiment.

【図３】実施例３の断面図FIG. 3 is a cross-sectional view of a third embodiment.

【図４】実施例４の断面図FIG. 4 is a sectional view of a fourth embodiment.

【図５】実施例５の断面図FIG. 5 is a sectional view of a fifth embodiment.

【図６】実施例１の広角端における収差曲線図FIG. 6 is an aberration curve diagram at the wide angle end according to the first embodiment.

【図７】実施例１の中間焦点距離における収差曲線図FIG. 7 is an aberration curve diagram at the intermediate focal length according to the first embodiment.

【図８】実施例１の望遠端における収差曲線図FIG. 8 is an aberration curve diagram at the telephoto end according to the first embodiment.

【図９】実施例２の広角端における収差曲線図FIG. 9 is an aberration curve diagram at the wide angle end according to the second embodiment.

【図１０】実施例２の中間焦点距離における収差曲線図FIG. 10 is an aberration curve diagram at the intermediate focal length according to the second embodiment.

【図１１】実施例２の望遠端における収差曲線図FIG. 11 is an aberration curve diagram at the telephoto end according to the second embodiment.

【図１２】実施例３の広角端における収差曲線図FIG. 12 is an aberration curve diagram at the wide angle end according to the third embodiment.

【図１３】実施例３の中間焦点距離における収差曲線図FIG. 13 is an aberration curve diagram at the intermediate focal length according to the third embodiment.

【図１４】実施例３の望遠端における収差曲線図FIG. 14 is an aberration curve diagram at a telephoto end according to a third embodiment.

【図１５】実施例４の広角端における収差曲線図FIG. 15 is an aberration curve diagram at the wide angle end according to the fourth embodiment.

【図１６】実施例４の中間焦点距離における収差曲線図FIG. 16 is an aberration curve diagram at the intermediate focal length according to the fourth embodiment.

【図１７】実施例４の望遠端における収差曲線図FIG. 17 is an aberration curve diagram at the telephoto end in Example 4.

【図１８】実施例５の広角端における収差曲線図FIG. 18 is an aberration curve diagram at the wide angle end according to the fifth embodiment.

【図１９】実施例５の中間焦点距離における収差曲線図FIG. 19 is an aberration curve diagram at the intermediate focal length according to the fifth embodiment.

【図２０】実施例５の望遠端における収差曲線図FIG. 20 is an aberration curve diagram at the telephoto end according to a fifth embodiment.

フロントページの続き (56)参考文献 特開 平３−6508（ＪＰ，Ａ) 特開 平２−294608（ＪＰ，Ａ) 特開 平２−285312（ＪＰ，Ａ) 特開 平２−232613（ＪＰ，Ａ) 特開 平２−208620（ＪＰ，Ａ) 特開 平２−165113（ＪＰ，Ａ) 特開 平２−123315（ＪＰ，Ａ) 特開 平２−118510（ＪＰ，Ａ) 特開 平２−106711（ＪＰ，Ａ) 特開 平３−181909（ＪＰ，Ａ) 特開 昭63−27809（ＪＰ，Ａ) 特開 昭63−34505（ＪＰ，Ａ) 特開 昭60−175020（ＪＰ，Ａ) 特開 平４−309913（ＪＰ，Ａ) 特開 昭63−157119（ＪＰ，Ａ) 特開 昭59−13211（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G02B 9/00 - 17/08 G02B 21/02 - 21/04 G02B 25/00 - 25/04 Continuation of the front page (56) References JP-A-3-6508 (JP, A) JP-A-2-294608 (JP, A) JP-A-2-285312 (JP, A) JP-A-2-232613 (JP) JP-A-2-208620 (JP, A) JP-A-2-165113 (JP, A) JP-A-2-123315 (JP, A) JP-A-2-118510 (JP, A) JP 2-106711 (JP, A) JP-A-3-181909 (JP, A) JP-A-63-27809 (JP, A) JP-A-63-34505 (JP, A) JP-A-60-175020 (JP, A) A) JP-A-4-309913 (JP, A) JP-A-63-157119 (JP, A) JP-A-59-13211 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) G02B 9/00-17/08 G02B 21/02-21/04 G02B 25/00-25/04

Claims (5)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】物体側より順に、正の屈折力を有する第１
レンズ群と、負の屈折力を有する第２レンズ群と、負の
屈折力を有する第３レンズ群と、前記第３レンズ群に続
くレンズ群が少なくとも一つの正のレンズ群とよりな
り、第３レンズ群よりも像側に明るさ絞りを有してい
て、次の条件（１），（２）を満足するズームレンズ。 （１） ０．４＜｜ｆ123 ／ｆW ｜＜０．７ （２） ０．５＜ｆ2 ／ｆ3 ＜２．５ ただしｆW は広角端における全系の焦点距離、ｆ123は
広角端における第１レンズ群，第２レンズ群，第３レン
ズ群の合成焦点距離、ｆ2 ，ｆ3は夫々第２レンズ群，
第３レンズ群の焦点距離である。1. A first lens having a positive refractive power in order from the object side.
A lens group, a second lens group having a negative refractive power, a third lens group having a negative refractive power, and a lens group following the third lens group comprising at least one positive lens group, A zoom lens that has a brightness stop on the image side of the three lens groups and satisfies the following conditions (1) and (2). (1) 0.4 <| f 123 / f W | <0.7 (2) 0.5 <f 2 / f 3 <2.5 where f W is the focal length of the entire system at the wide-angle end, and f 123 is The combined focal length of the first lens group, the second lens group, and the third lens group at the wide angle end, f 2 and f 3 are the second lens group, respectively.
This is the focal length of the third lens group. 【請求項２】前記明るさ絞りは、前記第３レンズ群に続
くレンズ群の物体側に位置する請求項１のズームレン
ズ。2. The zoom lens according to claim 1, wherein said aperture stop is located on the object side of a lens group following said third lens group. 【請求項３】前記第２レンズ群を少なくとも２枚の負レ
ンズと少なくとも１枚の正レンズで構成し、前記第３レ
ンズ群を少なくとも１枚の負レンズで構成する請求項１
のズームレンズ。3. The system according to claim 1, wherein said second lens group comprises at least two negative lenses and at least one positive lens, and said third lens group comprises at least one negative lens.
Zoom lens. 【請求項４】下記の条件（３），（４）を満足する請求
項１のズームレンズ。 （３） ０．８＜｜ｆ2 ／ｆW ｜＜２．０ （４） ０．５＜｜ｆ3 ／ｆW ｜＜１．５ ただしｆW は広角端における全系の焦点距離、ｆ2 ，ｆ
3は夫々第２レンズ群，第３レンズ群の焦点距離であ
る。4. The zoom lens according to claim 1, wherein the following conditions (3) and (4) are satisfied. (3) 0.8 <| f 2 / f W | <2.0 (4) 0.5 <| f 3 / f W | <1.5 However f W is the focal length of the entire system at the wide angle end, f 2 , f
3 respectively second lens group, the focal length of the third lens group. 【請求項５】前記第１レンズ群と前記第２レンズ群と前
記第３レンズ群の夫々が広角端より望遠端にかけて像面
からの距離が大になるように移動する請求項１のズーム
レンズ。5. The zoom lens according to claim 1, wherein each of said first lens group, said second lens group, and said third lens group moves from the wide-angle end to the telephoto end such that the distance from the image plane increases. .
JP21468492A 1992-07-21 1992-07-21 Zoom lens Expired - Fee Related JP3292510B2 (en)

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JP21468492A JP3292510B2 (en) 1992-07-21 1992-07-21 Zoom lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21468492A JP3292510B2 (en) 1992-07-21 1992-07-21 Zoom lens

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JPH0634885A JPH0634885A (en) 1994-02-10
JP3292510B2 true JP3292510B2 (en) 2002-06-17

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ID=16659875

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JP (1) JP3292510B2 (en)

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JPH0868941A (en) * 1994-08-30 1996-03-12 Nikon Corp High-magnification zoom lens
KR100382001B1 (en) * 1995-12-28 2003-08-21 삼성테크윈 주식회사 Real-image zoom finder
US6055114A (en) * 1997-06-18 2000-04-25 Nikon Corporation Zoom lens optical system
JP4315450B2 (en) 2005-03-11 2009-08-19 ソニー株式会社 Zoom lens system and imaging apparatus
JP5416980B2 (en) 2009-01-30 2014-02-12 パナソニック株式会社 Zoom lens system, interchangeable lens device, and camera system
JP5416982B2 (en) 2009-01-30 2014-02-12 パナソニック株式会社 Zoom lens system, interchangeable lens device, and camera system
US8023814B2 (en) 2009-01-30 2011-09-20 Panasonic Corporation Zoom lens system, interchangeable lens apparatus and camera system
JP5530105B2 (en) 2009-01-30 2014-06-25 パナソニック株式会社 Zoom lens system, interchangeable lens device, and camera system
JP5416981B2 (en) 2009-01-30 2014-02-12 パナソニック株式会社 Zoom lens system, interchangeable lens device, and camera system
JP5708040B2 (en) * 2011-03-02 2015-04-30 株式会社リコー Zoom lens and camera and information device
US9025035B2 (en) 2011-03-08 2015-05-05 Konica Minolta, Inc. Zoom lens, imaging optical device, and digital device
JP5668543B2 (en) * 2011-03-11 2015-02-12 株式会社リコー Zoom lens and camera and information device
JP5668544B2 (en) * 2011-03-15 2015-02-12 株式会社リコー Zoom lens and camera and information device
JP5928875B2 (en) * 2012-02-22 2016-06-01 株式会社リコー Zoom lens, information device, and portable information terminal device
JP5906998B2 (en) * 2012-08-24 2016-04-20 ソニー株式会社 Variable focal length lens system and imaging apparatus
JP6146871B2 (en) * 2014-04-25 2017-06-14 富士フイルム株式会社 Zoom lens and imaging device
JP6146870B2 (en) * 2014-04-25 2017-06-14 富士フイルム株式会社 Zoom lens and imaging device

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