JPH085913A - Rear focus type zoom lens - Google Patents

Rear focus type zoom lens

Info

Publication number
JPH085913A
JPH085913A JP6141499A JP14149994A JPH085913A JP H085913 A JPH085913 A JP H085913A JP 6141499 A JP6141499 A JP 6141499A JP 14149994 A JP14149994 A JP 14149994A JP H085913 A JPH085913 A JP H085913A
Authority
JP
Japan
Prior art keywords
lens
lens group
wide
angle end
focus type
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.)
Granted
Application number
JP6141499A
Other languages
Japanese (ja)
Other versions
JP3466711B2 (en
Inventor
Hiroki Nakayama
博喜 中山
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP14149994A priority Critical patent/JP3466711B2/en
Priority to US08/485,136 priority patent/US5847882A/en
Publication of JPH085913A publication Critical patent/JPH085913A/en
Priority to US09/121,093 priority patent/US6094312A/en
Application granted granted Critical
Publication of JP3466711B2 publication Critical patent/JP3466711B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • G02B15/16—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • G02B15/163—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
    • G02B15/167—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
    • G02B15/173—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +-+
    • 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
    • G02B15/145121—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 arranged +-+-+

Landscapes

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

Abstract

PURPOSE:To provide a zoom lens which is small in size although the zoom ratio is about 20 and the field angle at the wide-angle end is >=60 deg.C. CONSTITUTION:This rear focus type zoom lens has a 1st lens group I which is fixed and has positive refracting power, a 2nd lens group II with negative refracting power, a 3rd lens group III with positive refracting power, and a 4th lens group IV with negative refracting power in order from the object side; and zooming is performed by moving at least the 2nd lens group II and 4th lens group IV and focusing is performed by moving the 4th lens group IV.

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、インナーフォーカスも
しくはリヤフォーカス式のズームレンズに関し、特に広
角端における画角が広く（６０°以上）で、且つ約２０
倍という高変倍比を持ちながら全体として小型なリヤフ
ォーカス式ズームレンズに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner-focus or rear-focus type zoom lens, and in particular, it has a wide angle of view (60 ° or more) at the wide-angle end and about 20 degrees.
The present invention relates to a rear focus type zoom lens that has a high zoom ratio and is small as a whole.

【０００２】[0002]

【従来技術】最近、ホームビデオカメラ等の本体自体の
小型軽量化に伴い、撮影レンズとしてズームレンズにも
小型化が求められる一方で、高い変倍比を持つことが要
求されている。2. Description of the Related Art Recently, as the body itself such as a home video camera has become smaller and lighter, a zoom lens as a photographing lens has been required to have a smaller size, and also has a high zoom ratio.

【０００３】これらの要求に対してズームレンズ中の少
なくとも一部のレンズを移動させてフォーカシングを行
う所謂リヤフォーカス方式を採用することにより特に第
１レンズ群の有効径を小さくすることができると伴に、
近距離物体に対しても比較的容易に焦点調節が可能とな
る。In response to these requirements, it is possible to reduce the effective diameter of the first lens group especially by adopting a so-called rear focus system in which at least a part of the lenses in the zoom lens are moved for focusing. To
Focusing can be relatively easily performed even for a short-distance object.

【０００４】そして比較的高いズーム比を持った例とし
て特開平５−２１５９６７号公報がある。該公報によれ
ば、物体側より順の正の第１レンズ群、負の第２レンズ
群、正の第３レンズ群、負の第４レンズ群、正の第５レ
ンズ群を具備し、少なくとも第２、第５レンズ群を移動
させてズーミングを行い、第３〜第５レンズ群を移動さ
せてフォーカシングを行うリヤフォーカス式のズームレ
ンズを開示している。As an example having a relatively high zoom ratio, there is JP-A-5-215967. According to the publication, a positive first lens group, a negative second lens group, a positive third lens group, a negative fourth lens group, and a positive fifth lens group are provided in this order from the object side, and at least A rear focus type zoom lens is disclosed in which the second and fifth lens groups are moved for zooming, and the third to fifth lens groups are moved for focusing.

【０００５】[0005]

【発明が解決しようとする問題点】しかしながら、先の
公報では高いズーム比を持っているとはいえ、変倍比が
約１２倍程度となっており未だ十分とは言えなかった。
又、比較的重量が重い第５レンズ群をズーミング、及び
フォーカシング時に移動させているため、モータ等でこ
のレンズ群を移動させることを考えるとモーターへの負
荷を与えるとともに迅速なオートフォーカスを困難にし
ていた。However, even though the above publication has a high zoom ratio, the zoom ratio is about 12 times, which is not yet sufficient.
In addition, since the fifth lens group, which is relatively heavy, is moved during zooming and focusing, considering moving the lens group with a motor or the like imposes a load on the motor and makes quick autofocus difficult. Was there.

【０００６】本発明はかかる問題点に鑑みて、高い変倍
比（実施例では約２０倍）を持ちながらも小型なズーム
レンズの提供を第１の目的とする。In view of the above problems, a first object of the present invention is to provide a compact zoom lens having a high zoom ratio (about 20 times in the embodiment).

【０００７】又、迅速なフォーカシングを可能とするリ
ヤフォーカス式ズームレンズの提供を目的とする。It is another object of the present invention to provide a rear focus type zoom lens which enables quick focusing.

【０００８】更には、良好な光学性能を持ったリヤフォ
ーカス式のズームレンズの提供を目的とする。Another object of the present invention is to provide a rear focus type zoom lens having good optical performance.

【０００９】そして、本発明は物体側より順に、静止し
ており正の屈折力を有する第１レンズ群、負の屈折力を
有する第２レンズ群、正の屈折力を有する第３レンズ
群、負の屈折力を有する第４レンズ群、静止しており正
の屈折力を有する第５レンズ群を有し、前記第２レンズ
群と前記第４レンズ群を少なくとも移動させてズーミン
グを行うとともに、前記第４レンズ群を移動させてフォ
ーカシングを行うことを特徴としている。According to the present invention, in order from the object side, the first lens group that is stationary and has a positive refractive power, the second lens group that has a negative refractive power, the third lens group that has a positive refractive power, While having a fourth lens group having a negative refractive power, a fifth lens group that is stationary and has a positive refractive power, at least the second lens group and the fourth lens group are moved to perform zooming, It is characterized in that the fourth lens group is moved to perform focusing.

【００１０】又、特に第４レンズ群を広角端から望遠端
への移動に際して物体側に凹状の軌跡を描くようにして
移動させて、スペースの効率化そして第１レンズ群の径
が短縮されるようにしている。更に光学的諸条件を満足
させることにより、良好にフォーカスを可能ならしめる
とともに、良好な光学性能が得られるようにしている。Further, in particular, when the fourth lens group is moved from the wide-angle end to the telephoto end so as to draw a concave locus on the object side, space efficiency is improved and the diameter of the first lens group is shortened. I am trying. Further, by satisfying various optical conditions, good focusing can be achieved and good optical performance can be obtained.

【００１１】更なる本発明の特徴的事項は以後の実施例
から明らかとなるであろう。Further characteristic features of the present invention will be apparent from the following examples.

【００１２】[0012]

【実施例】図１は本発明の基本となるズームレンズの近
軸屈折力配置を示す図である。図２から図１４は本実施
例のレンズ断面、図１５〜図２７はその諸収差図を示
す。諸収差図において（Ａ）、（Ｂ）は各々広角端、望
遠端を示す。1 is a diagram showing a paraxial refractive power arrangement of a zoom lens, which is the basis of the present invention. 2 to 14 are lens cross sections of the present embodiment, and FIGS. 15 to 27 are aberration diagrams thereof. In the aberration diagrams, (A) and (B) show the wide-angle end and the telephoto end, respectively.

【００１３】Ｉは正の屈折力を有する第１レンズ群、Ｉ
Ｉは負の屈折力を有する第２レンズ群、ＩＩＩは正の屈
折力を有する第３レンズ群、ＩＶは負の屈折力を有する
第４レンズ群、Ｖは正の屈折力を有する第５レンズ群で
ある。ＩＭは像面で、ＣＣＤ等の固体撮像素子が配置さ
れている。ＳＰは絞りを示す。そして広角端から望遠端
へのズーミングを矢印に示す通り、即ち第２レンズ群Ｉ
Ｉを像面側へ、第４レンズ群を物体側に凹状の軌跡を描
くように移動させて行っている。尚実線は無限遠物体に
対する、破線は至近物体に対する各々の移動軌跡であ
る。そして、無限遠物体から至近物体に対するフォーカ
シングを第４レンズ群ＩＶを像側へ移動させることによ
って行っている。尚、少なくとも第１、第５レンズ群は
ズーミング中、常に静止している。I is the first lens group having a positive refractive power, I
I is a second lens group having a negative refractive power, III is a third lens group having a positive refractive power, IV is a fourth lens group having a negative refractive power, and V is a fifth lens having a positive refractive power. It is a group. IM is an image plane on which a solid-state image sensor such as a CCD is arranged. SP indicates a diaphragm. The zooming from the wide-angle end to the telephoto end is indicated by the arrow, that is, the second lens group I
I is moved to the image plane side, and the fourth lens group is moved to the object side so as to draw a concave trajectory. The solid line is the movement locus for an object at infinity, and the broken line is the movement locus for a near object. Then, focusing from an object at infinity to a near object is performed by moving the fourth lens group IV toward the image side. Note that at least the first and fifth lens groups are always stationary during zooming.

【００１４】このように第１レンズ群を繰り出してフォ
ーカシングを行う一般的な従来の方式に換えて第４レン
ズ群を移動させてフォーカスを行うことにより、前玉径
の短縮化を図るとともに近距離物体に対する焦点合せを
可能としている。As described above, by moving the fourth lens group to perform focusing instead of the general conventional method of extending the first lens group to perform focusing, the diameter of the front lens can be shortened and a short distance can be achieved. Focusing on an object is possible.

【００１５】又、本実施例におけるズームレンズの第２
レンズ群に、広角端から望遠端にかけてその横倍率β2
が等倍（β2 ＝−１）を越えるように移動させて高変倍
比が得られるようにする一方、これに伴う像面変動を前
述した通り第４レンズ群を物体側に凹状の軌跡を描くよ
うに移動させることで、スペース効率を高め、且つ、第
１レンズ群の径の短縮化を図りながら、高いズーム比
（多くの実施例で約２０倍）を得るよう工夫している。The second zoom lens according to the present embodiment is also provided.
The lateral magnification of the lens group from the wide-angle end to the telephoto end is β 2
Is moved so as to exceed the same magnification (β 2 = −1) so that a high zoom ratio can be obtained, while the image plane variation accompanying this is caused by the concave locus of the fourth lens group on the object side as described above. Is designed to obtain a high zoom ratio (about 20 times in many embodiments) while improving space efficiency and reducing the diameter of the first lens group.

【００１６】この時、鏡筒構造の簡素化を図るには第３
レンズ群を固定させることが望ましいが、第３レンズ群
を移動させてこの第３レンズ群に等倍分担させてもよ
い。そうすることでより小型化を図りつつ高いズーム比
を与えることが可能となる。At this time, the third method is to simplify the lens barrel structure.
It is desirable to fix the lens group, but it is also possible to move the third lens group and share the same magnification in the third lens group. By doing so, it becomes possible to provide a high zoom ratio while achieving further miniaturization.

【００１７】以上の構成を採用することにより、高いズ
ーム比を与えながら小型化を図ったズームレンズを提供
できるが、望ましくは以下の条件を満足させることが望
ましい。By adopting the above construction, it is possible to provide a zoom lens which is downsized while giving a high zoom ratio, but it is desirable to satisfy the following conditions.

【００１８】全系の広角端における焦点距離、第４レン
ズ群と第５レンズ群の無限遠物体に対するレンズ間隔を
各々ＦW 、Ｄ4Wとするとき、 １．８０＜Ｄ4W／ＦW ＜３．９ である。これはズーミングに伴う像面変動の補正とフォ
ーカス作用を果す第４レンズ群の移動範囲を規定するも
のである。下限値を越えると十分な至近距離物体に対し
てフォーカシングを行うことが困難となる。上限値を越
えるとフォーカシングは比較的容易に行うことができる
反面、レンズ全体が大型化し好ましくない。When the focal length at the wide-angle end of the entire system and the lens intervals of the fourth lens unit and the fifth lens unit with respect to an object at infinity are F W and D 4W , respectively, 1.80 <D 4W / F W <3 .9. This defines the movement range of the fourth lens group that corrects the image plane variation due to zooming and exerts the focusing action. When the value goes below the lower limit, it becomes difficult to perform focusing on a sufficiently close object. If the upper limit is exceeded, focusing can be performed relatively easily, but the entire lens becomes large, which is not preferable.

【００１９】ところでリヤフォーカス方式におけるズー
ムレンズではフォーカスレンズである第４レンズ群の繰
り出し量は広角端に比べて望遠側で大きくなる特性を有
している。特にこの傾向はズーム比が大きくなる程顕著
となる。これに対して本実施例では第２レンズ群と第３
レンズ群の広角端における無限遠物体に対する群間隔を
Ｄ2W、第４レンズ群と第５レンズ群の広角端における無
限遠物体に対する群間隔をＤ4Wとするとき、 １．５＜Ｄ2W／Ｄ4W＜３．５ なる条件を満足させて所望のズーム比を与えつつ良好な
フォーカスが実行できるようにしている。By the way, in the rear focus type zoom lens, the extension amount of the fourth lens group, which is the focus lens, is larger at the telephoto side than at the wide-angle end. In particular, this tendency becomes more remarkable as the zoom ratio increases. On the other hand, in this embodiment, the second lens group and the third lens group
When the group spacing for an object at infinity at the wide-angle end of the lens group is D 2W and the group spacing for an object at infinity at the wide-angle end of the fourth lens group and the fifth lens group is D 4W , 1.5 <D 2W / D By satisfying the condition of 4W <3.5, it is possible to perform a good focus while giving a desired zoom ratio.

【００２０】Ｄ2Wは主変倍レンズである第２レンズ群の
移動範囲を示し、Ｄ4Wはズーミングの際の像面変動補正
とフォーカス作用を果す第４レンズ群の移動範囲を示
す。この条件式下で各レンズ群の移動範囲を限定するこ
とで適正なズーム倍率と適正な至近距離の確保が容易と
なる。上限値を越えるとズーム比を稼ぐことが容易とな
るが、第４レンズ群のフォーカス時における移動量を確
保することが困難になってくる。一方下限値を越えると
所望のズーム比を確保することが困難となる。D 2W represents the moving range of the second lens group, which is the main variable power lens, and D 4W represents the moving range of the fourth lens group, which performs the image plane variation correction and the focusing action during zooming. By limiting the moving range of each lens group under this conditional expression, it becomes easy to secure a proper zoom magnification and a proper short distance. When the value exceeds the upper limit, it becomes easy to gain the zoom ratio, but it becomes difficult to secure the movement amount of the fourth lens group during focusing. On the other hand, when the value goes below the lower limit, it becomes difficult to secure a desired zoom ratio.

【００２１】特に又第４レンズ群の光学的パワーと関連
付けて以下の条件を満足させることが望ましい。Particularly, it is desirable to satisfy the following condition in association with the optical power of the fourth lens group.

【００２２】０．４＜｜Ｄ4W／Ｆ4 ｜＜１．０ 但しＦ4 は第４レンズ群の焦点距離である。この下限値
を越えるとフォーカスのための移動量を確保することが
困難となり至近距離物体に対するフォーカシングが困難
になる。上限値を越えるとフォーカシングは容易に行う
ことができるが、レンズ系全体の大型化してくるので好
ましくない。0.4 <| D 4W / F 4 | <1.0 where F 4 is the focal length of the fourth lens group. If the lower limit is exceeded, it becomes difficult to secure a movement amount for focusing, and it becomes difficult to focus on an object at a close range. If the upper limit is exceeded, focusing can be easily performed, but the size of the entire lens system becomes large, which is not preferable.

【００２３】特に望遠端ほど任意の至近距離でのフォー
カス量が大きい事は上述した通りであるが、特により高
倍化のズームレンズの場合は更に以下の範囲にある事が
好ましい。As described above, the focus amount at an arbitrary close-up distance is particularly large toward the telephoto end, but particularly in the case of a zoom lens with a higher magnification, it is preferably in the following range.

【００２４】０．６３＜｜Ｄ4W／Ｆ4 ｜＜１．０0.63 <| D 4W / F 4 | <1.0

【００２５】以上においては第４レンズ群を中心とした
説明を行ったが、一方で以下の条件式を満足させること
で前玉径の小型化、及び高いズーム比を与えつつ、良好
な収差補正、特に像面湾曲を補正することが可能とな
る。In the above description, the description was centered on the fourth lens group. On the other hand, by satisfying the following conditional expression, the front lens diameter can be reduced, and a high zoom ratio can be provided, while performing good aberration correction. In particular, it becomes possible to correct the field curvature.

【００２６】それは第１レンズ群と第２レンズ群の焦点
距離をＦ1 、Ｆ2 とした時 ５．７＜｜Ｆ1 ／Ｆ2 ｜＜７ なる条件である。The condition is 5.7 <| F 1 / F 2 | <7 when the focal lengths of the first lens group and the second lens group are F 1 and F 2 .

【００２７】この下限値を越えると高倍比のために第２
レンズ群の移動量を大きく取る必要があり大型化及び前
玉径が大きくなる。上限値をこえるとペッツバール和が
負の値で大きくなり像面が大きくプラス側に倒れる傾向
となり好ましくない。If the lower limit value is exceeded, the second ratio is required due to the high multiplication ratio.
It is necessary to take a large amount of movement of the lens group, resulting in a large size and a large front lens diameter. If the value exceeds the upper limit, the Petzval sum becomes large at a negative value, and the image surface tends to largely fall to the plus side, which is not preferable.

【００２８】ところで、本実施例では像面に固体撮像素
子が配置されたビデオカメラに適したズームレンズを提
供しているが、適当なバックフォーカスを保ちつつ固体
撮像素子に対する射出瞳位置の変動を小さくするため
に、第４レンズ群の無限遠物体に対する倍率β4 の符号
がズーミングに伴って変化しないように設定している。
倍率β4 がズーミング中符号を変えて変化してしまうと
最終レンズ群である固定の第５レンズ群への光の入射角
度の変化してしまうがこうすることで射出瞳位置が変動
することを抑制している。By the way, in the present embodiment, the zoom lens suitable for the video camera in which the solid-state image pickup device is arranged on the image plane is provided, but the fluctuation of the exit pupil position with respect to the solid-state image pickup device is maintained while maintaining an appropriate back focus. In order to reduce the size, the sign of the magnification β 4 of the fourth lens group with respect to an object at infinity is set so as not to change with zooming.
If the magnification β 4 changes by changing the sign during zooming, the incident angle of light to the fixed fifth lens group, which is the final lens group, will change. However, by doing so, it is possible that the exit pupil position changes. It's suppressed.

【００２９】そして更に望ましくは無限遠物体に対する
第４レンズ群の広角端と望遠端における近軸横倍率を各
々β4W、β4Tとした時 β4W×β4T＞０ となるように設定するとよい。More preferably, the paraxial lateral magnifications at the wide-angle end and the telephoto end of the fourth lens unit with respect to an object at infinity are β 4W and β 4T , respectively, and β 4W × β 4T > 0 may be set. .

【００３０】又、光学系の射出瞳を適当に設定しつつ、
レンズのバックフォーカスを適正に確保するためには常
に以下の条件を満たしているのが好ましい。While setting the exit pupil of the optical system appropriately,
In order to properly secure the back focus of the lens, it is preferable that the following conditions are always satisfied.

【００３１】０＜β5 ＜０．２５ この範囲を越えると、バックフォーカスが長くなり又、
レンズ系が大きくなるばかりでなく射出瞳が短くなり好
ましくない。0 <β 5 <0.25 Exceeding this range, the back focus becomes longer and
Not only the lens system becomes large, but also the exit pupil becomes short, which is not preferable.

【００３２】更には第ｉレンズ群の焦点距離距離をそれ
ぞれＦｉ、全系の広角端及び望遠端の焦点距離距離をそ
れぞれＦW 、Ｆt とすると以下の条件式を満たしている
のが好ましい。Further, if the focal length of the i-th lens unit is Fi and the focal lengths of the wide angle end and the telephoto end of the entire system are F W and F t , respectively, it is preferable that the following conditional expressions are satisfied.

【００３３】０．２５＜Ｆ2 ／Ｆ4 ＜０．７0.25 <F 2 / F 4 <0.7

【００３４】この式は、移動レンズ群の最適なパワー配
置を与えるものである。上限値を越えると所望の変倍比
を得るために第２レンズ群の移動量が大きくなり前玉径
及び全系が大型化して適当ではない。また下限値を越え
ると像面補正群でありフォーカス群である第４レンズ群
の移動量が大きくなり全系の大型化を招き適当ではな
い。この式は移動レンズ群の適正な移動量を与えるため
に必要な式である。具体的には変倍のために第２レンズ
群の適正な移動量を限定し、第４レンズ群を効率よく移
動させる、特に第４レンズ群が広角端より望遠端にかけ
て像面側に凸の軌跡で移動し、又特に略完全往復するた
めに必要なものである。This equation gives the optimum power arrangement for the moving lens group. If the value exceeds the upper limit, the amount of movement of the second lens group becomes large to obtain a desired zoom ratio, and the front lens diameter and the entire system become large, which is not suitable. On the other hand, if the value goes below the lower limit, the movement amount of the fourth lens group, which is the image plane correction group and the focus group, becomes large, which causes an increase in size of the entire system, which is not appropriate. This equation is an equation necessary for giving an appropriate amount of movement of the moving lens group. Specifically, the amount of movement of the second lens group is limited for zooming, and the fourth lens group is moved efficiently. In particular, the fourth lens group is convex toward the image plane side from the wide-angle end to the telephoto end. It is necessary for moving on a locus, and especially for almost complete round trips.

【００３５】又、広角端から望遠端にかけての第２レン
ズ群の倍率の比（β２Ｔ／β２W ）を、Ｚ２、全系の焦
点距離の比（ＦT ／ＦW ）をＺとすると、 ０．４＜Ｚ２／Ｚ＜１．３ を満足している事が好ましい。この式は全体の変倍に対
する第２レンズ群の変倍の割合を示すものである。この
上限値を越えるとレンズ系のどこかの群がズーミング中
減倍している事になり変倍効率が悪く大型化の原因とな
り適当でない。又下限値を越えると変倍に寄与するレン
ズ群が複数個有る事になりそれぞれの制御が難しくな
る。[0035] Further, the ratio of the magnification of the second lens group to the telephoto end from the wide-angle end (β2T / β2 W), Z2 , the ratio of the focal length of the entire system of (F T / F W) When Z, 0 It is preferable to satisfy the condition of 4 <Z2 / Z <1.3. This expression shows the ratio of the magnification variation of the second lens group to the overall magnification variation. If the value exceeds this upper limit, some lens group in the lens system is demagnified during zooming, resulting in poor variable power efficiency and an increase in size. On the other hand, when the value goes below the lower limit, there are a plurality of lens groups that contribute to zooming, and it becomes difficult to control each of them.

【００３６】[0036]

【外１】 この式は主変倍レンズ群である第２レンズ群のパワーに
関する式である。この範囲を適当に選択する事により有
効に高変倍化が達成できる。具体的には上式の下限値を
越えると第２レンズ群のパワーが強くなりすぎ、ペッツ
バール和が負に大きくなり像面がオーバー（補正過剰）
となるばかりでなく、敏感度が高くなりピントズレや、
像揺れが起こり安くなるため機構構成が複雑になり適当
ではない。又上限値を越えると第２レンズ群のパワーが
弱くなり所望の変倍比の達成のために第２レンズ群の移
動量が大きくなり大型化して適当ではない。[Outer 1] This equation is an equation relating to the power of the second lens group which is the main variable power lens group. By appropriately selecting this range, a high zoom ratio can be effectively achieved. Specifically, if the lower limit value of the above equation is exceeded, the power of the second lens group becomes too strong, the Petzval sum becomes negatively large, and the image plane becomes overcorrected (overcorrected).
Not only will it become more sensitive, but it will become more sensitive and out of focus,
Since the image shake occurs and becomes cheaper, the structure of the mechanism becomes complicated, which is not suitable. On the other hand, if the value exceeds the upper limit, the power of the second lens group becomes weak and the amount of movement of the second lens group becomes large in order to achieve a desired zoom ratio, which is not suitable because it becomes large.

【００３７】高倍化のためには更に以下の条件に入って
いる事が好ましい。In order to increase the magnification, it is preferable that the following conditions are further satisfied.

【００３８】[0038]

【外２】 [Outside 2]

【００３９】更に以下の式を満たしているのがよい。Further, it is preferable that the following formula is satisfied.

【００４０】１．５＜Ｆ3 ／ＦW ＜４．５ １．９＜｜Ｆ4 ／ＦW ｜＜５ １．６＜Ｆ5 ／ＦW ＜５ 以上の式は絞りから像面側に配したレンズ群のパワーに
関する式である。それぞれの範囲は本ズームレンズの射
出瞳位置を短くなりすぎないように設定し、更に上述し
た様に物体側からの斜光束が瞳に浅い角度で入射させ、
前玉径の小型化に寄与させるための条件である。1.5 <F 3 / F W <4.5 1.9 <| F 4 / F W | <5 1.6 <F 5 / F W <5 The above equation is from the diaphragm to the image plane side. It is an equation regarding the power of the arranged lens groups. Each range is set so that the exit pupil position of the zoom lens does not become too short, and as described above, the oblique light flux from the object side is incident on the pupil at a shallow angle,
This is a condition for contributing to the reduction of the front lens diameter.

【００４１】共に上限値を越えると上記斜光束が浅い角
度に設定できずに、前玉径の増大を招き、また下限値を
越えると射出瞳がプラス側に短くなりすぎ、固体撮像素
子に対してテレセントリックな光束を確保できず、又ズ
ーム、フォーカスに対して収差変動が大きくなり適当で
はない。この範囲に入っていれば距離合わせ（フォーカ
シング）に対しても大きな移動にならないように小型化
を達成するものである。このように範囲を逸脱すると前
玉径が大型化し全系も大型化して、更に撮像素子に対し
て適当な射出角度を設定できなくなる。If both values exceed the upper limit value, the oblique light flux cannot be set to a shallow angle, leading to an increase in the front lens diameter. It is not suitable because a telecentric luminous flux cannot be secured and the aberration variation becomes large for zooming and focusing. If it is within this range, downsizing is achieved so as not to make a great movement even for distance matching (focusing). If the diameter deviates from the range as described above, the diameter of the front lens becomes large and the entire system also becomes large, and it becomes impossible to set an appropriate emission angle for the image pickup device.

【００４２】特に射出瞳位置に関しては以下の条件も満
足しているのが好ましい。In particular, it is preferable that the following conditions are satisfied with respect to the exit pupil position.

【００４３】−１．５＜Ｆ4 ／Ｆ5 ＜−０．７５ この式の上限を越えると第４レンズ群の屈折力が強くな
りフォーカシングの距離変動が大きくなり適当でない。
また下限値を越えるとフォーカシングの移動量が大きく
なり大型化して適当でないばかりでなく固定の結像レン
ズである第５レンズ群の屈折力が強くなり射出瞳が短く
なり適当でない。-1.5 <F 4 / F 5 <-0.75 If the upper limit of this expression is exceeded, the refracting power of the fourth lens group becomes strong and the distance variation of focusing becomes large, which is not suitable.
On the other hand, if the value goes below the lower limit, the moving amount of focusing becomes large and the size becomes large, which is not suitable, and also the fifth lens group, which is a fixed imaging lens, has a strong refractive power and the exit pupil becomes short, which is not suitable.

【００４４】広角端の画角を広く設定するためには、広
角端において正の第１レンズ群と負の第２レンズ群の主
点間隔ｅｌが短ければ更に全系の焦点距離を短くでき広
角化が可能となる。但し第１レンズ群と第２レンズ群の
間には最低限の空気間隔が必要であり、相互にぶつかっ
ては適当ではない。そのため第１レンズ群の像側主点位
置が第２レンズ群よりに設定されているか、第２レンズ
群の物体側主点が第１レンズ群寄りに設定されているの
が好ましい。特に第１レンズ群においては前玉径の大き
さにも絡むので以下の条件式を満たすのが好ましい。In order to set a wide angle of view at the wide-angle end, if the principal point distance e1 between the positive first lens group and the negative second lens group at the wide-angle end is short, the focal length of the entire system can be further shortened. Can be realized. However, a minimum air gap is required between the first lens group and the second lens group, and it is not appropriate that they collide with each other. Therefore, it is preferable that the image-side principal point position of the first lens group is set closer to that of the second lens group, or the object-side principal point of the second lens group is set closer to the first lens group. In particular, in the first lens group, it is preferable that the following conditional expression is satisfied because it is also involved in the size of the front lens diameter.

【００４５】−０．２５＜Ｈ1 ′／Ｆ1 ＜−０．０５[0045] -0.25 <H 1 '/ F 1 <-0.05

【００４６】ここで、Ｈ1 ′は、第１レンズ群の最も像
側の面の頂点と第１レンズ群の像側主点の間隔（−は物
体側、＋は像側）で、Ｆ1 は、第１レンズ群の焦点距離
を表す。この式は、前述したように第１レンズ群と第２
レンズ群の主点間隔を短くするために必要なものであ
る。下限値を越えると、第１レンズ群の主点位置が物体
側に行き過ぎ前述したｅｌを短くできなくなり所望の広
角にならない。上限値をこえると、第１レンズ群と第２
レンズ群の間隔が広がり、前玉径が大きくなり適当でな
い。Here, H 1 ′ is the distance between the apex of the most image-side surface of the first lens group and the image-side principal point of the first lens group (-is the object side, + is the image side), and F 1 Represents the focal length of the first lens group. This formula is used for the first lens group and the second lens group as described above.
This is necessary in order to shorten the principal point interval of the lens group. When the value goes below the lower limit, the principal point position of the first lens unit goes too far toward the object side, and the above-mentioned el cannot be shortened, so that the desired wide angle cannot be obtained. If the upper limit is exceeded, the first lens group and the second lens group
The distance between the lens groups is widened and the diameter of the front lens is increased, which is not suitable.

【００４７】特に以下の範囲に設定するのが前玉径の小
型化には更に好ましい。In particular, it is more preferable to set the range below to reduce the diameter of the front lens.

【００４８】−０．１０＜Ｈ1 ′／Ｆ1 ＜−０．０５[0048] -0.10 <H 1 '/ F 1 <-0.05

【００４９】更に、全系を小型化にするときは、以下の
条件を満たすのが好ましい。Further, when the entire system is miniaturized, it is preferable to satisfy the following conditions.

【００５０】１．５＜ＢｆW／ＦW ＜４．０ ここで、ＢｆWは広角端での、物体距離無限遠時のバッ
クフォーカス（ガラスブロック、フィルター等実施例中
の“Ｇ”を除く）である。この式は、全系を効果的に小
型化するのに必要な式であり、下限値を越えると、フィ
ルター等のブロックを入れるのが無理になるばかりでな
く、射出瞳が短めとなり、撮像素子への結像がテレセン
トリック系からズレることになり不適当である。又上限
値を越えると大型化して不適当である。1.5 <Bf W / F W <4.0 where Bf W is the back focus at the wide-angle end when the object distance is infinity (glass block, filter, etc., except “G” in the examples). ). This formula is necessary to effectively downsize the entire system. If the lower limit is exceeded, it will not be possible to insert a block such as a filter, and the exit pupil will be shortened. It is unsuitable because the image formation on is deviated from the telecentric system. On the other hand, if it exceeds the upper limit, the size becomes large and it is inappropriate.

【００５１】又、前玉径を小型にするには以下の式を満
たすのが好ましい。Further, in order to make the front lens diameter small, it is preferable to satisfy the following formula.

【００５２】４．５＜Ｆ1 ／ＦW ＜１０4.5 <F 1 / F W <10

【００５３】この式は第２レンズ群に対する物点、即ち
倍率に係わる式である。全系を小さく設定するには、第
２レンズ群がズーミングに際して等倍を挟んでいるのが
好ましい。等倍を挟むと第４レンズ群のズーミングの軌
跡は略往復になり、最も効果的なスペース効率で高変倍
が可能となる。具体的には、この式の上限を越えると、
第２レンズ群に対する物点が遠くなり、第２レンズ群の
結像倍率が低くなり、効果的な小型化が難しくなる。更
に、第１レンズ群と第２レンズ群の間隔が大きくなり小
型化の達成が難しくなる。また下限値を越えると、第２
レンズ群の倍率が大きくなり、高倍化の達成が難しくな
る。This equation relates to the object point with respect to the second lens group, that is, the magnification. In order to set the whole system small, it is preferable that the second lens group sandwich the same magnification during zooming. When the same magnification is sandwiched, the locus of zooming of the fourth lens group becomes a substantially reciprocating movement, and high zooming is possible with the most effective space efficiency. Specifically, if the upper limit of this equation is exceeded,
The object point with respect to the second lens group becomes distant, the imaging magnification of the second lens group becomes low, and effective miniaturization becomes difficult. Furthermore, the distance between the first lens group and the second lens group becomes large, which makes it difficult to achieve miniaturization. If the lower limit is exceeded, the second
The magnification of the lens group becomes large, and it becomes difficult to achieve high magnification.

【００５４】高倍化の達成の為には更に以下の範囲には
いっていることが好ましい。In order to achieve high magnification, it is preferable that the ratio is further within the following range.

【００５５】７．５＜Ｆ1 ／ＦW ＜１０7.5 <F 1 / F W <10

【００５６】具体的なレンズ構成としては、第１レンズ
群は少なくとも１枚の負レンズを含む複数のレンズで構
成され、第２レンズ群は少なくとも１枚の正レンズを含
む複数のレンズで構成され、第３レンズ群は少なくとも
１枚の正レンズで構成され、第４レンズ群は少なくとも
１枚の負レンズで構成され、第５レンズ群は少なくとも
１枚の負レンズを含む複数のレンズで構成されているの
が好ましい。As a concrete lens configuration, the first lens group is composed of a plurality of lenses including at least one negative lens, and the second lens group is composed of a plurality of lenses including at least one positive lens. , The third lens group is composed of at least one positive lens, the fourth lens group is composed of at least one negative lens, and the fifth lens group is composed of a plurality of lenses including at least one negative lens. Is preferred.

【００５７】特に第１レンズ群は、物体側より順に、物
体側に凸面を有する負メニスカスレンズ、物体側に凸面
を有する正レンズ、物体側に凸面を有する正レンズの３
枚で構成、第２レンズ群は、物体側より順に、物体側に
凸面を有する負メニスカスレンズ、両凹レンズ、正レン
ズの順で構成すると良い。In particular, the first lens group includes, in order from the object side, a negative meniscus lens having a convex surface on the object side, a positive lens having a convex surface on the object side, and a positive lens having a convex surface on the object side.
It is preferable that the second lens group be made up of a single lens, and that the second lens group be composed of, in order from the object side, a negative meniscus lens having a convex surface on the object side, a biconcave lens, and a positive lens.

【００５８】又、第３レンズ群のいずれかの面に非球面
を持つことでより高度な収差補正が可能となる。特に第
３レンズ群を１枚で構成するときは非球面は物体側、像
面側いずれに配しても良い。特に非球面は、球面収差の
補正のためには物体側に施した方が比較的良好である。Further, by having an aspherical surface on any surface of the third lens group, it becomes possible to perform higher-level aberration correction. Especially when the third lens group is composed of one lens, the aspherical surface may be arranged on either the object side or the image plane side. In particular, the aspherical surface is relatively good on the object side in order to correct spherical aberration.

【００５９】特にフォーカシングに伴う収差変動、特に
色収差変動を押えるために正レンズと負レンズの２枚で
構成しこの際正レンズと負レンズは貼合せにしているの
が好ましい。またこの正レンズと負レンズのアッベ数を
それぞれν４ｐ、ν４ｎとすると ν４ｐ＜ν４ｎ を満たしているのが望ましい。この範囲を逸脱すると色
収差の距離変動が大きくなり適当ではない。In particular, in order to suppress aberration fluctuations due to focusing, especially chromatic aberration fluctuations, it is preferable that the positive lens and the negative lens are composed of two lenses, and the positive lens and the negative lens are bonded together. Further, when the Abbe numbers of the positive lens and the negative lens are respectively ν4p and ν4n, it is desirable that ν4p <ν4n is satisfied. If it deviates from this range, the variation of chromatic aberration in distance becomes large, which is not suitable.

【００６０】このように第４レンズ群を正レンズと負レ
ンズの２枚を貼合せにするとズーミングとフォーカシン
グで共に移動する第４レンズ群の構成が１ブロックとな
り簡易化し保持し易くなる。When the positive lens and the negative lens of the fourth lens group are cemented together in this way, the structure of the fourth lens group that moves together during zooming and focusing becomes one block, which simplifies and facilitates holding.

【００６１】更に、第４レンズ群を構成する正レンズ、
負レンズのアッベ数を、ν４ｐ、ν４ｎとするとき、以
下の式を満足するのが好ましい。Further, a positive lens which constitutes the fourth lens group,
When the Abbe numbers of the negative lens are ν4p and ν4n, it is preferable to satisfy the following formula.

【００６２】ν４ｎ−ν４ｐ＞１５Ν4n-ν4p> 15

【００６３】更に、ズーミング中の色収差の変動を有効
に行なうためには、以下の式を満たしている方が良い。Further, in order to effectively change the chromatic aberration during zooming, it is better to satisfy the following equation.

【００６４】ν４ｎ−ν４ｐ＞３０Ν4n-ν4p> 30

【００６５】第４レンズ群を構成するレンズが上述した
ように１ブロック化した場合、特に正レンズと負レンズ
の貼合せや負レンズ１枚で構成された場合、そのブロッ
クの物体像面は物体側に凹を向け、像側面は像側に凹面
をむけているのが好ましい。When the lenses constituting the fourth lens group are made into one block as described above, particularly when the positive lens and the negative lens are cemented together or when it is composed of one negative lens, the object image plane of the block is the object. It is preferable that the concave surface is directed toward the side and the image side surface is concave toward the image side.

【００６６】第５レンズ群はズーミング中固定の正レン
ズ群であり、球面収差が発生し易い。この球面収差を補
正するには、少なくとも１枚の正レンズと少なくとも１
枚の負レンズで構成するのが好ましい。特に第５レンズ
群に正レンズを１枚、負レンズを１枚の２枚で構成する
ときはいずれかの面に非球面を配するのが良い。これに
より良好に球面収差を補正できる。特に色収差の補正を
行なうために貼合せレンズを配しても良い。とくに第５
レンズ群でフォーカシングを行うときは負レンズと正レ
ンズの貼合せの一体構成の方がレンズも軽く構成も簡易
なので保持し易く好ましい。The fifth lens group is a positive lens group which is fixed during zooming, and spherical aberration easily occurs. To correct this spherical aberration, at least one positive lens and at least one
It is preferably composed of a single negative lens. In particular, when the fifth lens group includes one positive lens and one negative lens, it is preferable to dispose an aspherical surface on either surface. Thereby, spherical aberration can be corrected well. In particular, a cemented lens may be provided to correct chromatic aberration. Especially the fifth
When focusing is performed with a lens group, it is preferable to attach a negative lens and a positive lens integrally so that the lens is light and the structure is simple and easy to hold.

【００６７】ところで、広角化に第１レンズ群と第２レ
ンズ群の主点間隔ｅｌを広角端でいかに小さくできるか
は重要な点のひとつであることは既に述べた。そのため
には第１レンズ群の形状は具体的には以下のような構成
が好ましい。As described above, how to reduce the principal point distance e1 between the first lens group and the second lens group at the wide angle end is one of the important points for widening the angle. For that purpose, the shape of the first lens group is preferably specifically as follows.

【００６８】第１レンズ群の物体側より順に、物体側に
凸面を有する負メニスカスレンズＬ１１、空気間隔を空
けて、物体側に凸面を有する正レンズＬ１２、更に物体
側に凸面を有する正レンズＬ１３で構成され、前記Ｌ１
１、Ｌ１２で構成される空気レンズは、負の屈折力を有
することである。In order from the object side of the first lens group, a negative meniscus lens L11 having a convex surface on the object side, a positive lens L12 having a convex surface on the object side with an air gap, and a positive lens L13 having a convex surface on the object side. And the L1
The air lens composed of 1 and L12 is to have a negative refractive power.

【００６９】又、第２レンズ群においても、ｅｌを広角
端で短くするために、第２レンズ群の物体側主点を物体
側に設定するような構成にすることが、広角化には望ま
しい。Also in the second lens group, in order to shorten el at the wide-angle end, it is desirable to set the object side principal point of the second lens group to the object side for widening the angle. .

【００７０】具体的には、第２レンズ群の物体側より順
に、物体側に凸面を有する負メニスカスレンズＬ２１、
両凹の負レンズＬ２１、空気間隔を挟んで正レンズＬ２
３の順に配置することである。この空気間隔によって第
２レンズ群の物体側主点が第１レンズ寄りにより、広角
側におけるｅｌを短く取りやすくなり広角化に有効であ
る。また更にＬ２３の像面側に負レンズＬ２４を配して
も良い。このＬ２４により更に第２レンズ群の物体側主
点が第１レンズ寄りになり、またズーミングによる色収
差の変動も押えられるので有効である。Specifically, in order from the object side of the second lens group, a negative meniscus lens L21 having a convex surface on the object side,
Biconcave negative lens L21, positive lens L2 with an air gap in between
It is arranged in the order of 3. Due to this air gap, the object-side principal point of the second lens unit is closer to the first lens, and it is easy to obtain a short el on the wide-angle side, which is effective for widening the angle. Further, a negative lens L24 may be arranged on the image plane side of L23. This L24 is effective because the object-side principal point of the second lens unit is further closer to the first lens, and fluctuations in chromatic aberration due to zooming are suppressed.

【００７１】更に小型で広角のズームレンズの達成は、
上記の構成において、最も物体側のレンズの外径をφ
1 、広角端の全系の焦点距離をＦW とするとき、以下の
条件式を満足することで可能である。The achievement of a more compact and wide-angle zoom lens is as follows.
In the above configuration, the outer diameter of the lens closest to the object side is φ
1. When the focal length of the entire system at the wide-angle end is F W , it is possible to satisfy the following conditional expression.

【００７２】０．１０＜Ｆw ／φ1 ＜０．２０0.10 <F w / φ 1 <0.20

【００７３】一般に広角端の焦点距離ＦW が短くなる
と、前玉径φ1 は大きくなる。逆に広角端の焦点距離Ｆ
W が長めになると、レンズの望遠端の明るさにも寄るが
前玉径φ1 小さくなる。この式は、小型で広角のズーム
レンズを達成するための前玉径と広角端の焦点距離の適
切なバランスを掲示したものである。この上限・下限ど
ちらを逸脱しても小型で広角のズームレンズの提供はで
きなくなる。具体的には、上限を逸脱すると望遠寄りの
ズームレンズになり、下限を逸脱すると大型のズームレ
ンズになりがちとなる。Generally, as the focal length F W at the wide-angle end becomes shorter, the front lens diameter φ 1 becomes larger. On the contrary, the focal length F at the wide-angle end
When W becomes longer, the diameter of the front lens becomes smaller by 1 depending on the brightness at the telephoto end of the lens. This formula posts an appropriate balance between the front lens diameter and the focal length at the wide-angle end in order to achieve a compact and wide-angle zoom lens. If either the upper limit or the lower limit is deviated, it becomes impossible to provide a compact and wide-angle zoom lens. Specifically, if the upper limit is exceeded, the zoom lens will be closer to the telephoto side, and if the lower limit is exceeded, the zoom lens will be a large zoom lens.

【００７４】ここで論じている前玉径φ1 とは、第１レ
ンズの光学有効径に準ずるもので、実際のレンズ外径の
ことである。前玉径φ1 は、第１レンズの光学有効径よ
り０〜６％程度大きいものを示す。The front lens diameter φ 1 discussed here is based on the optical effective diameter of the first lens and is the actual lens outer diameter. The front lens diameter φ 1 is 0 to 6% larger than the optically effective diameter of the first lens.

【００７５】尚本実施例において第５レンズ群は、ズー
ミング中常に静止させたがフォーカスに際して移動させ
ることも可能である。In the present embodiment, the fifth lens group is always stationary during zooming, but it can be moved during focusing.

【００７６】以下に、本発明の数値実施例を記載する。Numerical examples of the present invention will be described below.

【００７７】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は物体側より順
に第ｉ番目のレンズ厚及び空気間隔、ｎｉとνｉはそれ
ぞれ物体側より順に第ｉ番目のレンズの屈折力とアッベ
数である。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 gap in order from the object side, and ni and νi are respectively in order from the object side. It is the refractive power and Abbe number of the i-th lens.

【００７８】非球面形状は、光軸方向にＸ軸、光軸と垂
直な方向にＹ軸、光の進行方向を正とし、レンズの頂点
とＸ軸の交点を原点に採り、ｒをレンズ面の近軸曲率半
径、ｋ，Ａ2 、Ａ3 、Ａ4 、Ａ5 を非球面係数とすると
き、The aspherical shape has an X axis in the optical axis direction, a Y axis in a direction perpendicular to the optical axis, a positive light traveling direction, an intersection point between the apex of the lens and the X axis as an origin, and r is a lens surface. When the paraxial radius of curvature of k, A 2 , A 3 , A 4 and A 5 are aspherical coefficients,

【００７９】[0079]

【外３】 [Outside 3]

【００８０】なる式で表されるものである。It is represented by the following equation.

【００８１】また例えば『Ｄ−０３』の表示は『１
０-3』を意味する。Ｇがフォースプレート等を示す。For example, the display of "D-03" is "1
It means 0 -3 ". G indicates a force plate or the like.

【００８２】[0082]

【外４】 [Outside 4]

【００８３】[0083]

【外５】 [Outside 5]

【００８４】[0084]

【外６】 [Outside 6]

【００８５】[0085]

【外７】 [Outside 7]

【００８６】[0086]

【外８】 [Outside 8]

【００８７】[0087]

【外９】 [Outside 9]

【００８８】[0088]

【外１０】 [Outside 10]

【００８９】[0089]

【外１１】 [Outside 11]

【００９０】[0090]

【外１２】 [Outside 12]

【００９１】[0091]

【外１３】 [Outside 13]

【００９２】[0092]

【外１４】 [Outside 14]

【００９３】[0093]

【外１５】 [Outside 15]

【００９４】[0094]

【外１６】 [Outside 16]

【００９５】[0095]

【表１】 [Table 1]

【００９６】[0096]

【表２】 [Table 2]

【００９７】[0097]

【表３】 [Table 3]

【００９８】[0098]

【表４】 [Table 4]

【００９９】[0099]

【発明の効果】以上説明した通り、ズーミングに伴う移
動レンズの移動を工夫することにより、小型で高変倍比
を持つリヤフォーカス式のズームレンズを提供すること
が可能となる。又特に負の第４レンズ群が広角端から望
遠端への移動に際して物体側に凹状の軌跡をとることで
スペース効率を図り第１レンズ群の径を小型化すること
が可能となる。更に、レンズの諸元を設定することで、
小型でありながら、良好に収差補正されたズームレンズ
を提供することができる。As described above, by devising the movement of the moving lens during zooming, it is possible to provide a compact rear focus type zoom lens having a high zoom ratio. Further, particularly when the negative fourth lens unit takes a concave locus on the object side when moving from the wide-angle end to the telephoto end, space efficiency can be achieved and the diameter of the first lens unit can be reduced. Furthermore, by setting the specifications of the lens,
It is possible to provide a zoom lens that is small in size but is well corrected for aberrations.

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

【図１】本発明に関するズームレンズの近軸屈折力配置
を示す図。FIG. 1 is a diagram showing a paraxial refractive power arrangement of a zoom lens according to the present invention.

【図２】本発明に関する数値実施例１の広角端における
レンズ断面図。FIG. 2 is a lens cross-sectional view at a wide-angle end according to Numerical Example 1 according to the present invention.

【図３】本発明に関する数値実施例２の広角端における
レンズ断面図。FIG. 3 is a lens cross-sectional view at a wide-angle end according to Numerical Example 2 according to the present invention.

【図４】本発明に関する数値実施例３の広角端における
レンズ断面図。FIG. 4 is a lens cross-sectional view at a wide-angle end according to Numerical Example 3 according to the present invention.

【図５】本発明に関する数値実施例４の広角端における
レンズ断面図。FIG. 5 is a lens cross-sectional view at a wide-angle end according to Numerical Example 4 according to the present invention.

【図６】本発明に関する数値実施例５の広角端における
レンズ断面図。FIG. 6 is a lens cross-sectional view at a wide-angle end according to Numerical Example 5 according to the present invention.

【図７】本発明に関する数値実施例６の広角端における
レンズ断面図。FIG. 7 is a lens cross-sectional view at a wide-angle end according to Numerical Example 6 according to the present invention.

【図８】本発明に関する数値実施例７の広角端における
レンズ断面図。FIG. 8 is a lens cross-sectional view at a wide-angle end according to Numerical Example 7 according to the present invention.

【図９】本発明に関する数値実施例８の広角端における
レンズ断面図。FIG. 9 is a lens cross-sectional view at a wide-angle end according to Numerical Example 8 according to the present invention.

【図１０】本発明に関する数値実施例９の広角端におけ
るレンズ断面図。FIG. 10 is a lens cross-sectional view at a wide-angle end according to Numerical Example 9 of the present invention.

【図１１】本発明に関する数値実施例１０の広角端にお
けるレンズ断面図。FIG. 11 is a lens cross-sectional view at a wide-angle end according to Numerical Example 10 according to the present invention.

【図１２】本発明に関する数値実施例１１の広角端にお
けるレンズ断面図。FIG. 12 is a lens cross-sectional view at a wide-angle end according to Numerical Example 11 according to the present invention.

【図１３】本発明に関する数値実施例１２の広角端にお
けるレンズ断面図。FIG. 13 is a lens cross-sectional view at a wide-angle end according to Numerical Example 12 according to the present invention.

【図１４】本発明に関する数値実施例１３の広角端にお
けるレンズ断面図。FIG. 14 is a lens cross-sectional view at a wide-angle end according to Numerical Example 13 of the present invention.

【図１５】本発明に関する数値実施例１の諸収差図。FIG. 15 is a diagram of various types of aberration of Numerical example 1 according to the present invention.

【図１６】本発明に関する数値実施例２の諸収差図。FIG. 16 is a diagram of various types of aberration of Numerical example 2 according to the present invention.

【図１７】本発明に関する数値実施例３の諸収差図。FIG. 17 is a diagram of various types of aberration of Numerical example 3 according to the present invention.

【図１８】本発明に関する数値実施例４の諸収差図。FIG. 18 is a diagram of various types of aberration of Numerical example 4 according to the present invention.

【図１９】本発明に関する数値実施例５の諸収差図。FIG. 19 is a diagram of various types of aberration of Numerical example 5 according to the present invention.

【図２０】本発明に関する数値実施例６の諸収差図。FIG. 20 is an aberration diagram of Numerical example 6 according to the present invention.

【図２１】本発明に関する数値実施例７の諸収差図。FIG. 21 is a diagram of various types of aberration of Numerical example 7 according to the present invention.

【図２２】本発明に関する数値実施例８の諸収差図。FIG. 22 is a diagram of various types of aberration of Numerical example 8 according to the present invention.

【図２３】本発明に関する数値実施例９の諸収差図。FIG. 23 is a diagram of various types of aberration of Numerical example 9 according to the present invention.

【図２４】本発明に関する数値実施例１０の諸収差図。FIG. 24 is a diagram of various types of aberration of Numerical example 10 according to the present invention.

【図２５】本発明に関する数値実施例１１の諸収差図。FIG. 25 is a diagram of various types of aberration of Numerical example 11 according to the present invention.

【図２６】本発明に関する数値実施例１２の諸収差図。FIG. 26 is a diagram of various types of aberration of Numerical Example 12 according to the present invention.

【図２７】本発明に関する数値実施例１３の諸収差図。FIG. 27 is a diagram of various types of aberration of Numerical Example 13 according to the present invention.

【符号の説明】[Explanation of symbols]

Ｉ 第１レンズ群 ＩＩ 第２レンズ群 ＩＩＩ 第３レンズ群 ＩＶ 第４レンズ群 Ｖ 第５レンズ群 ＳＰ 絞り ＩＭ 像面 ｄ ｄ線 ｇ ｇ線 ΔＳ サジタル像面 ΔＭ メリディオナル像面 I First lens group II Second lens group III Third lens group IV Fourth lens group V Fifth lens group SP Aperture IM Image plane d d line g g line ΔS Sagittal image plane ΔM Meridional image plane

Claims (7)

【特許請求の範囲】[Claims] 【請求項１】 物体側より順に静止しており、正の屈折
力を有する第１レンズ群、負の屈折力を有する第２レン
ズ群、正の屈折力を有する第３レンズ群、負の屈折力を
有する第４レンズ群、静止しており正の屈折力を有する
第５レンズ群を有し、前記第２レンズ群と前記第４レン
ズ群を少なくとも移動させてズーミングを行うととも
に、前記第４レンズ群を移動させてフォーカシングを行
うことを特徴とするリヤフォーカス式ズームレンズ。1. A first lens group having a positive refracting power, a second lens group having a negative refracting power, a third lens group having a positive refracting power, and a negative refracting, which are stationary in order from the object side. A fourth lens group having a power and a fifth lens group that is stationary and has a positive refracting power, at least the second lens group and the fourth lens group are moved to perform zooming, and A rear focus type zoom lens characterized by moving the lens group to perform focusing. 【請求項２】 前記第４レンズ群は広角端から望遠端へ
のズーミングに際して物体側に凹状の軌跡を描くことを
特徴とする請求項１のリヤフォーカス式ズームレンズ。2. The rear focus type zoom lens according to claim 1, wherein the fourth lens group draws a concave locus on the object side during zooming from the wide-angle end to the telephoto end. 【請求項３】 全系の広角端における焦点距離、無限遠
物体に対する前記第４レンズ群と前記第５レンズ群のレ
ンズ間隔を各々Ｆｗ、Ｄ4Wとするとき、１．８０＜Ｄ4W
／ＦW ＜３．９０なる条件式を満足することを特徴とす
る請求項１のリヤフォーカス式ズームレンズ。3. The focal length at the wide-angle end of the entire system, and when the lens spacings of the fourth lens unit and the fifth lens unit with respect to an object at infinity are Fw and D 4W , respectively, 1.80 <D 4W
The rear focus type zoom lens according to claim 1, wherein the conditional expression: / F W <3.90 is satisfied. 【請求項４】 広角端における、前記第２レンズ群と第
３レンズ群の無限遠物体に対する間隔、前記第４レンズ
群と第５レンズ群の無限遠物体に対する間隔を各々
Ｄ2W、Ｄ4Wとするとき、 １．５＜Ｄ2W／Ｄ4W＜３．５ なる条件式を満足することを特徴とする請求項１のリヤ
フォーカス式ズームレンズ。4. The distance between the second lens group and the third lens group with respect to an object at infinity and the distance between the fourth lens group and the fifth lens group with respect to an object at infinity at the wide-angle end are D 2W and D 4W , respectively. The rear focus type zoom lens according to claim 1, wherein the conditional expression 1.5 <D 2W / D 4W <3.5 is satisfied. 【請求項５】 広角端における前記第４レンズ群と前記
第５レンズ群の無限遠物体に対する間隔をＤ4W、第４レ
ンズ群の焦点距離をＦ4 とするとき、 ０．４＜｜Ｄ4W／Ｆ4 ｜＜１．０ なる条件式を満足することを特徴とする請求項１のリヤ
フォーカス式ズームレンズ。5. When the distance between the fourth lens group and the fifth lens group at the wide-angle end with respect to an object at infinity is D 4W and the focal length of the fourth lens group is F 4 , 0.4 <| D 4W The rear focus type zoom lens according to claim 1, wherein a conditional expression of / F 4 | <1.0 is satisfied. 【請求項６】 前記第１レンズ群と第２レンズ群の焦点
距離を各々Ｆ1 、Ｆ2 とするとき、 ５．７＜｜Ｆ1 ／Ｆ2 ｜＜７ なる条件式を満足することを特徴とする請求項１のリヤ
フォーカス式ズームレンズ。6. When the focal lengths of the first lens group and the second lens group are F 1 and F 2 , respectively, the conditional expression of 5.7 <| F 1 / F 2 | <7 is satisfied. The rear focus type zoom lens according to claim 1. 【請求項７】 前記第４レンズ群は正レンズと負レンズ
を有し該正レンズのアッベ数をν4P、ν4Nとするとき、 ν4N−ν4P＞１５ なる条件を満足することを特徴とする請求項１のリヤフ
ォーカス式ズームレンズ。7. The fourth lens group has a positive lens and a negative lens, and when the Abbe numbers of the positive lens are ν 4P and ν 4N , the condition of ν 4N −ν 4P > 15 is satisfied. The rear focus type zoom lens according to claim 1.
JP14149994A 1994-06-23 1994-06-23 Rear focus zoom lens Expired - Fee Related JP3466711B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP14149994A JP3466711B2 (en) 1994-06-23 1994-06-23 Rear focus zoom lens
US08/485,136 US5847882A (en) 1994-06-23 1995-06-07 Rear focusing zoom lens
US09/121,093 US6094312A (en) 1994-06-23 1998-07-23 Rear focusing zoom lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14149994A JP3466711B2 (en) 1994-06-23 1994-06-23 Rear focus zoom lens

Publications (2)

Publication Number Publication Date
JPH085913A true JPH085913A (en) 1996-01-12
JP3466711B2 JP3466711B2 (en) 2003-11-17

Family

ID=15293373

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14149994A Expired - Fee Related JP3466711B2 (en) 1994-06-23 1994-06-23 Rear focus zoom lens

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Country Link
JP (1) JP3466711B2 (en)

Cited By (41)

* Cited by examiner, † Cited by third party
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JPH095624A (en) * 1995-06-19 1997-01-10 Fuji Photo Optical Co Ltd Zoom lens
US5659426A (en) * 1995-03-31 1997-08-19 Nikon Corporation Zoom lens
JPH10161026A (en) * 1996-12-05 1998-06-19 Canon Inc Zoom lens
JPH11101941A (en) * 1997-09-26 1999-04-13 Canon Inc Rear focus type zoom lens
US6118593A (en) * 1998-09-09 2000-09-12 Canon Kabushiki Kaisha Zoom lens and optical apparatus having the same
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