JP2001228395A - Rear focus type zoom lens and optical equipment using the same - Google Patents
Rear focus type zoom lens and optical equipment using the sameInfo
- Publication number
- JP2001228395A JP2001228395A JP2000041671A JP2000041671A JP2001228395A JP 2001228395 A JP2001228395 A JP 2001228395A JP 2000041671 A JP2000041671 A JP 2000041671A JP 2000041671 A JP2000041671 A JP 2000041671A JP 2001228395 A JP2001228395 A JP 2001228395A
- Authority
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- Japan
- Prior art keywords
- lens
- group
- object side
- refractive power
- rear focus
- 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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Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
- G02B15/1441—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive
- G02B15/144113—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive arranged +-++
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、リヤーフォーカス
式のズームレンズ及びそれを用いた光学機器に関し、特
にビデオカメラやフィルムカメラ、そして放送用カメラ
等に好適に用いられる高変倍比でありながら、大口径比
であり、構成するレンズ枚数が比較的少ないリヤーフォ
ーカス式のズームレンズ及びそれを用いた光学機器に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear focus type zoom lens and an optical apparatus using the same, and more particularly to a rear focus type zoom lens having a high zoom ratio suitably used for a video camera, a film camera, a broadcast camera, and the like. The present invention relates to a rear focus type zoom lens having a large aperture ratio and a relatively small number of constituent lenses, and an optical apparatus using the same.
【０００２】[0002]
【従来の技術】従来よりビデオカメラや写真カメラ等の
光学機器に用いられるズームレンズにおいて、物体側の
第１レンズ群以外のレンズ群を移動させてフォーカスを
行なう所謂リヤーフォーカス式を採用したものが種々提
案されている。一般にリヤーフォーカス式ズームレンズ
は比較的小型軽量のレンズ群を移動させて焦点合せを行
なう為にフォーカスレンズ群の駆動力が小さくなり、迅
速な焦点合せが出来る等の特長がある。2. Description of the Related Art Conventionally, a zoom lens used for an optical apparatus such as a video camera or a photographic camera employs a so-called rear focus type in which a lens group other than a first lens group on the object side is moved to perform focusing. Various proposals have been made. In general, a rear focus type zoom lens has a feature that a relatively small and lightweight lens group is moved to perform focusing, so that the driving force of the focus lens group is small, and quick focusing is possible.
【０００３】例えば、特開昭６２−２４２１３号公報、
特開平２−４８６２１号公報、そして特開平４−４３３
１１号公報などでは、物体側より順に正の屈折力の第１
レンズ群、変倍作用の負の屈折力の第２レンズ群、正の
屈折力の第３レンズ群、そして正の第４レンズ群の４つ
のレンズ群を有し、前記第１、第３レンズ群の各レンズ
群を固定とし、前記第２レンズ群を光軸に沿って移動さ
せて変倍を行い、前記第４レンズ群を変倍に伴う像面位
置変動を補正するように光軸に沿って移動させるととも
に、該第４レンズ群を移動させて合焦を行うリヤーフォ
ーカス式ズームレンズが提案されている。[0003] For example, JP-A-62-24233,
JP-A-2-48621 and JP-A-4-433
In Japanese Patent Publication No. 11 and the like, the first positive refractive power in
The first and third lenses include four lens groups, a lens group, a second lens group having a negative refractive power for zooming, a third lens group having a positive refractive power, and a positive fourth lens group. Each lens group of the group is fixed, the second lens group is moved along the optical axis to perform zooming, and the fourth lens group is moved along the optical axis so as to correct the image plane position variation accompanying zooming. A rear focus zoom lens has been proposed which moves the fourth lens group along and moves the fourth lens group for focusing.
【０００４】又、特開昭６３−２９７１８号公報では、
物体側より順に正の屈折力の第１群と、負レンズ、負レ
ンズ、正レンズの３枚のレンズにて構成され、全体とし
て負の屈折力で変倍時に可動であって主として変倍をつ
かさどる第２群と、正の屈折力を有し非球面を含む第３
群と、少し大きな空気間隔をあけて正の屈折力を有し変
倍に伴う像面変動を補正し、合焦のために移動する第４
群より構成したズームレンズを開示している。In Japanese Patent Application Laid-Open No. 63-29718,
The first lens unit has a positive refractive power and a negative lens, a negative lens, and a positive lens in order from the object side. A second group that controls the first group and a third group that has a positive refractive power and includes an aspheric surface.
A fourth lens unit having a positive refracting power with a slightly large air gap between the lens unit and the image surface to correct for image plane fluctuation due to zooming, and moving for focusing.
A zoom lens composed of a group is disclosed.
【０００５】又、特開平５−７２４７２号公報では、物
体側より順に正の屈折力で固定の第１群、負の屈折力で
変倍のための第２群、固定で集光作用を有し正の屈折力
の第３群、像面位置を維持するために光軸上を移動する
正の屈折力の第４群を有する非球面を用いたズームレン
ズを開示している。これは、第２群はメニスカス状の負
レンズと両凹レンズと正レンズを配し、第３群は１面以
上の非球面である単レンズから構成され、第４群は１面
以上の非球面を有するレンズで構成されている。In Japanese Patent Application Laid-Open No. 5-72472, a first lens unit having a positive refractive power and a second lens unit for zooming with a negative refractive power are arranged in order from the object side. A zoom lens using an aspheric surface having a third lens unit having a positive refractive power and a fourth lens unit having a positive refractive power that moves on the optical axis to maintain the image plane position is disclosed. The second group includes a meniscus negative lens, a biconcave lens, and a positive lens, the third group includes a single lens having one or more aspheric surfaces, and the fourth group includes one or more aspheric surfaces. .
【０００６】[0006]
【発明が解決しようとする課題】一般にズームレンズに
おいてリヤーフォーカス方式を採用するとレンズ系全体
が小型化され、又、迅速なるフォーカスが可能となり、
更に近接撮影が容易になる等の特長が得られる。In general, when a rear focus system is employed in a zoom lens, the entire lens system is reduced in size, and quick focusing becomes possible.
Further, features such as easy close-up photography can be obtained.
【０００７】しかしながら反面、フォーカスの際の収差
変動が大きくなり、無限遠物体から近距離物体に至る物
体距離全般に渡り高い光学性能を得るのが大変難しくな
ってくる。[0007] On the other hand, however, aberration fluctuation at the time of focusing becomes large, and it becomes very difficult to obtain high optical performance over the entire object distance from an object at infinity to an object at a short distance.
【０００８】特に大口径比で高変倍比のズームレンズで
は機構の簡素化を図りつつ、全変倍範囲にわたり、又、
物体距離全般にわたり高い光学性能を得るのが大変難し
くなってくる。In particular, in a zoom lens having a large aperture ratio and a high zoom ratio, the mechanism is simplified, over the entire zoom range, and
It becomes very difficult to obtain high optical performance over the entire object distance.
【０００９】例えば、先の特開昭６２−２４２１３号公
報で提案されているリヤーフォーカス式のズームレンズ
の実施例をみると、変倍の機能を有する第２レンズ群
は、物体側より順に物体側に凸面を向けたメニスカス状
の負の単レンズ、両レンズ面が凹面の負レンズと正レン
ズとを接合した貼合せレンズより構成されている。該貼
合せレンズは主に軸上の色収差、球面収差および軸外の
コマ収差の補正を行なっている。For example, in the embodiment of the rear focus type zoom lens proposed in Japanese Patent Application Laid-Open No. Sho 62-24213, the second lens group having the function of zooming is arranged in the order from the object side to the object side. It is composed of a meniscus negative single lens with the convex surface facing the side, and a cemented lens in which a negative lens and a positive lens whose both lens surfaces are concave are joined. The laminated lens mainly corrects axial chromatic aberration, spherical aberration, and off-axis coma.
【００１０】前記ズームタイプにおいて更に小型化、高
変倍化を図ろうとして第２レンズ群の屈折力を強める
と、該第２レンズ群の貼合せレンズ面での収差補正の負
担が大きくなり過ぎ、全ズーム域で高性能を実現するの
が困難となる。If the refractive power of the second lens group is increased in order to further reduce the size and increase the zoom ratio of the zoom type, the burden of aberration correction on the cemented lens surface of the second lens group becomes too large. It is difficult to achieve high performance in the entire zoom range.
【００１１】また、該第２レンズ群の屈折力を強める
と、該第２レンズ群を構成する各レンズの曲率が小さく
なると伴に高次の収差発生量が増加し、ズーム全域で良
好に収差補正を行うことが困難になってくる。Further, when the refractive power of the second lens group is increased, the curvature of each lens constituting the second lens group is reduced, and the amount of higher-order aberrations is increased. It becomes difficult to make corrections.
【００１２】本発明は、レンズ系全体を小型化し、高変
倍比であるにもかかわらず高い光学性能を有し、かつレ
ンズの構成枚数を減らした簡易な構成のレンズ全長の短
いズームレンズ及びそれを用いた光学機器の提供を目的
とする。SUMMARY OF THE INVENTION The present invention provides a zoom lens having a short overall lens length and a simple configuration in which the entire lens system is reduced in size, has high optical performance despite a high zoom ratio, and has a reduced number of lenses. It is intended to provide an optical device using the same.
【００１３】[0013]
【課題を解決するための手段】請求項１の発明のズーム
レンズは、物体側より順に正の屈折力の第１群、負の屈
折力の第２群、絞り正の屈折力の第３群、そして正の屈
折力の第４群の４つのレンズ群を有し、広角端から望遠
端への変倍の際には、該第２群を像面側へ移動させると
共に第４群を物体側に凸状の軌跡を有するように移動さ
せ、合焦の際には該第４群を移動させて行い、該第２群
を物体側から順に、物体側に凸面を向けたメニスカス状
の負の第２１レンズ、両レンズ面が凹面の負の第２２レ
ンズ、両レンズ面が凸面の正の第２３レンズと負の第２
４レンズとを接合した貼合わせレンズより構成し、該第
３群は非球面を有する正の１枚のレンズにより構成した
ことを特徴としている。According to a first aspect of the present invention, there is provided a zoom lens having a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a third lens unit having a positive refractive power. And a fourth lens unit having a positive refractive power. In zooming from the wide-angle end to the telephoto end, the second unit is moved to the image plane side and the fourth unit is moved to the object side. The lens is moved so as to have a convex locus on the side, and the focusing is performed by moving the fourth lens group. The second lens group is sequentially moved from the object side to a negative meniscus shape having a convex surface facing the object side. The 21st lens, the negative 22nd lens with both lens surfaces concave, the positive 23rd lens with both lens surfaces convex, and the negative 2nd lens
The third lens unit is composed of a cemented lens in which four lenses are joined, and the third group is composed of one positive lens having an aspheric surface.
【００１４】請求項２の発明は請求項１の発明におい
て、前記第２２レンズの像側のレンズ面の曲率半径をＲ
２２２、前記第２３レンズの物体側のレンズ面の曲率半
径をＲ２３１とするときAccording to a second aspect of the present invention, in the first aspect, the radius of curvature of the image-side lens surface of the 22nd lens is R.
222, when the radius of curvature of the object-side lens surface of the 23rd lens is R231
【００１５】[0015]
【数３】 (Equation 3)
【００１６】なる条件を満足することを特徴としてい
る。It is characterized by satisfying the following conditions.
【００１７】請求項３の発明は請求項１又は２の発明に
おいて、前記第２３レンズの材質のアッベ数をν２３、
前記第２４レンズの材質のアッベ数をν２４とするとき １５＜（ν２４−ν２３）＜３０…(2) なる条件を満足することを特徴としている。According to a third aspect of the present invention, in the first or second aspect, the Abbe number of the material of the 23rd lens is ν23,
When the Abbe number of the material of the twenty-fourth lens is ν24, the following condition is satisfied: 15 <(ν24−ν23) <30 (2)
【００１８】請求項４の発明は請求項１，２又は３の発
明において、前記第２レンズ群の焦点距離をｆ２、前記
第２３レンズと前記第２４レンズとの接合レンズ面の曲
率半径をＲ２３４とするときAccording to a fourth aspect of the present invention, in the first, second, or third aspect, the focal length of the second lens group is f2, and the radius of curvature of the cemented lens surface between the 23rd lens and the 24th lens is R234. And when
【００１９】[0019]
【数４】 (Equation 4)
【００２０】なる条件を満足することを特徴としてい
る。It is characterized by satisfying the following conditions.
【００２１】請求項５の発明の光学機器は請求項１から
４のいずれか１項のリヤーフォーカス式のズームレンズ
を有することを特徴としている。According to a fifth aspect of the present invention, there is provided an optical apparatus including the rear focus type zoom lens according to any one of the first to fourth aspects.
【００２２】[0022]
【発明の実施の形態】図１は本発明のリヤーフォーカス
式のズームレンズの実施形態１の要部断面図、図２，図
３，図４は実施形態１の広角端，中間，望遠端のズーム
位置における収差図である。FIG. 1 is a sectional view of an essential part of a rear focus type zoom lens according to a first embodiment of the present invention, and FIGS. 2, 3 and 4 show a wide angle end, a middle position and a telephoto end of the first embodiment. FIG. 7 is an aberration diagram at a zoom position.
【００２３】図５は本発明のリヤーフォーカス式のズー
ムレンズの実施形態２の要部断面図、図６，図７，図８
は実施形態２の広角端，中間，望遠端のズーム位置にお
ける収差図である。FIG. 5 is a sectional view of a main part of a rear focus type zoom lens according to a second embodiment of the present invention, and FIGS.
9A is an aberration diagram at a zoom position at a wide-angle end, a middle position, and a telephoto end according to the second embodiment.
【００２４】図９は本発明のリヤーフォーカス式のズー
ムレンズの実施形態３の要部断面図、図１０，図１１，
図１２は実施形態３の広角端，中間，望遠端のズーム位
置における収差図である。FIG. 9 is a sectional view of a principal part of a rear focus type zoom lens according to a third embodiment of the present invention, and FIGS.
FIG. 12 is an aberration diagram at a zoom position at a wide angle end, a middle position, and a telephoto end according to the third embodiment.
【００２５】図１３は本発明のリヤーフォーカス式のズ
ームレンズの実施形態４の要部断面図、図１４，図１
５，図１６は実施形態４の広角端，中間，望遠端のズー
ム位置における収差図である。FIG. 13 is a sectional view of a principal part of a rear focus type zoom lens according to a fourth embodiment of the present invention, and FIGS.
5 and FIG. 16 are aberration diagrams of the fourth embodiment at zoom positions at the wide-angle end, the middle position, and the telephoto end.
【００２６】図１７は本発明のリヤーフォーカス式のズ
ームレンズの実施形態５の要部断面図、図１８，図１
９，図２０は実施形態５の広角端，中間，望遠端のズー
ム位置における収差図である。FIG. 17 is a sectional view of a main portion of a rear focus type zoom lens according to a fifth embodiment of the present invention, and FIGS.
9 and 20 are aberration diagrams of the fifth embodiment at zoom positions at the wide-angle end, the middle position, and the telephoto end.
【００２７】図２１は本発明のリヤーフォーカス式のズ
ームレンズの実施形態６の要部断面図、図２２，図２
３，図２４は実施形態６の広角端，中間，望遠端のズー
ム位置における収差図である。FIG. 21 is a sectional view of a main part of a rear focus type zoom lens according to a sixth embodiment of the present invention, and FIGS.
3 and FIG. 24 are aberration diagrams at the wide-angle end, a middle position, and a telephoto end according to the sixth embodiment.
【００２８】図２５は本発明のリヤーフォーカス式のズ
ームレンズの実施形態７の要部断面図、図２６，図２
７，図２８は実施形態７の広角端，中間，望遠端のズー
ム位置における収差図である。FIG. 25 is a sectional view of a main part of a rear focus type zoom lens according to a seventh embodiment of the present invention, and FIGS.
7 and 28 are aberration diagrams of the seventh embodiment at zoom positions at the wide-angle end, the middle position, and the telephoto end.
【００２９】図中Ｌ１は正の屈折力の第１群、Ｌ２は負
の屈折力の第２群、Ｌ３は正の屈折力の第３群、Ｌ４は
正の屈折力の第４群である。ＳＰは開口絞りであり、第
３群Ｌ３の前方に配置している。Ｇは色分解プリズムや
フェースプレートやフィルター等のガラスブロックであ
る。ＩＰは像面であり、ＣＣＤ等の撮像素子が配置され
ている。In the figure, L1 is a first group having a positive refractive power, L2 is a second group having a negative refractive power, L3 is a third group having a positive refractive power, and L4 is a fourth group having a positive refractive power. . SP denotes an aperture stop, which is arranged in front of the third lens unit L3. G is a glass block such as a color separation prism, a face plate, and a filter. IP is an image plane on which an image sensor such as a CCD is arranged.
【００３０】本実施形態では広角端から望遠端への変倍
に際して矢印のように第２群を像面側へ移動させると共
に、変倍に伴う像面変動を第４群の一部又は全部（本実
施形態では全部）を物体側に凸状の軌跡を有しつつ移動
させて補正している。In this embodiment, when zooming from the wide-angle end to the telephoto end, the second lens unit is moved to the image plane side as indicated by an arrow, and the image plane fluctuation due to zooming is partly or entirely included in the fourth lens unit. In the present embodiment, all of them are corrected while moving along a convex locus toward the object side.
【００３１】又、第４群の一部又は全部（本実施形態で
は全部）を光軸上移動させてフォーカスを行うリヤーフ
ォーカス式を採用している。同図に示す第４群の実線の
曲線４ａと点線の曲線４ｂは各々無限遠物体と近距離物
体にフォーカスしているときの広角端から望遠端への変
倍に伴う際の像面変動を補正するための移動軌跡を示し
ている。尚、第１群と第３群は変倍及びフォーカスの際
固定である。Also, a rear focus system is employed in which a part or the whole (all in the present embodiment) of the fourth group is moved on the optical axis to perform focusing. A solid line curve 4a and a dotted line curve 4b of the fourth lens group shown in the same figure show the image plane fluctuation caused by zooming from the wide-angle end to the telephoto end when focusing on an object at infinity and an object at a short distance, respectively. The movement locus for correction is shown. The first and third units are fixed during zooming and focusing.
【００３２】本実施例においては第４群を移動させて変
倍に伴う像面変動の補正を行うと共に第４群を移動させ
てフォーカスを行うようにしている。特に同図の曲線４
ａ，４ｂに示すように広角端から望遠端への変倍に際し
て物体側へ凸状の軌跡を有するように移動させている。
これにより第３群と第４群との空間の有効利用を図りレ
ンズ全長の短縮化を効果的に達成している。In the present embodiment, the fourth lens unit is moved to correct the image plane fluctuation caused by zooming, and the fourth lens unit is moved to perform focusing. In particular, curve 4 in FIG.
When zooming from the wide-angle end to the telephoto end, the lens is moved so as to have a convex trajectory toward the object side as shown in FIGS.
Thereby, the space between the third and fourth units is effectively used, and the overall length of the lens is effectively reduced.
【００３３】本実施例において、例えば望遠端において
無限遠物体から近距離物体へフォーカスを行う場合は同
図の直線４ｃに示すように第４群を前方へ繰り出すこと
により行っている。In this embodiment, for example, when focusing from an object at infinity to an object at a short distance at the telephoto end, the fourth unit is moved forward as shown by a straight line 4c in FIG.
【００３４】本発明において最も特徴的な点は、第２群
Ｌ２を前述したレンズ形状の３枚の負レンズと１枚の正
レンズの３群４枚のレンズより構成し、更に第３群Ｌ３
を構成する１つの正レンズに非球面を用いている点にあ
る。The most characteristic point of the present invention is that the second lens unit L2 is composed of three negative lenses and one positive lens having the above-mentioned lens shape, and four lenses of the third lens unit L3.
Is that an aspherical surface is used for one positive lens.
【００３５】高変倍比のズームレンズにおいて、小型で
ズーム全域に渡り良好に収差補正するためには、主に変
倍作用を担うバリエータと呼ばれる該第２レンズ群（以
下バリエータとも呼ぶ）での収差変動を小さく押さえる
事が重要である。しかし、小型で高変倍のレンズ仕様を
満たすためには変倍作用を担うバリエータに強い負の屈
折力を設定する必要があり、収差補正には不利な条件と
なる。In a zoom lens having a high zoom ratio, in order to correct aberrations compactly and satisfactorily over the entire zoom range, the second lens group (hereinafter also referred to as a variator) mainly called a variator that performs a zooming action. It is important to minimize aberration fluctuations. However, in order to satisfy the specifications of a small-sized and high-magnification lens, it is necessary to set a strong negative refractive power to a variator that performs a magnification function, which is disadvantageous for aberration correction.
【００３６】従来のバリエータは例えば特開平４−８８
３０９号公報実施例に見られるような負レンズ、負レン
ズと正レンズの接合レンズの２群３枚構成のレンズタイ
プが主流であった、このタイプのバリエータで高変倍比
のズームレンズを実現しようとすると、バリエーターの
負の屈折力が強くなるに伴い、バリエータ内の負レンズ
と正レンズの接合レンズの接合レンズ面の曲率がきつく
なり、この接合レンズ面での高次収差の発生がズーム全
域での収差変動を大きくする原因となっていた。A conventional variator is disclosed, for example, in Japanese Patent Laid-Open No. 4-88.
The mainstream is a lens type having two groups and three lenses of a negative lens and a cemented lens of a negative lens and a positive lens as seen in the embodiment of Japanese Patent Publication No. 309. A variator of this type realizes a zoom lens with a high zoom ratio. If this is attempted, as the negative refractive power of the variator becomes stronger, the curvature of the cemented lens surface of the cemented lens of the negative lens and the positive lens in the variator becomes tight, and the occurrence of higher-order aberrations on this cemented lens surface will zoom. This causes the aberration fluctuation in the entire region to be large.
【００３７】そこで本発明のズームレンズにおいては、
変倍に大きく寄与する第２レンズ群Ｌ２を上記のような
レンズ構成にすることにより、各レンズのパワーの分担
を減らしペッツバール和の低減を図っている。これによ
って、高変倍比にしてもズーミングによる像面の変動を
少なくしている。更に該第２レンズ群から発散で入って
くる光束を受け止める第３レンズ群の正レンズに非球面
を配することにより光学性能の向上も図っている。各実
施形態においては、第３レンズ群Ｌ３の物体側のレンズ
面に非球面を用いている。Therefore, in the zoom lens of the present invention,
By configuring the second lens unit L2, which greatly contributes to zooming, to the above-described lens configuration, the sharing of power of each lens is reduced, and the Petzval sum is reduced. As a result, even at a high zoom ratio, fluctuations in the image plane due to zooming are reduced. Further, the optical performance is improved by arranging an aspherical surface on the positive lens of the third lens group that receives the divergent light beam from the second lens group. In each embodiment, an aspheric surface is used for the lens surface on the object side of the third lens unit L3.
【００３８】又、各数値実施例では、第１群を物体側に
凸面を向けたメニスカス状の負の第１１レンズ、両レン
ズ面が凸面の正レンズ、そしてメニスカス状の正レンズ
より構成している。又、第４群を両レンズ面が凹面の負
レンズ、両レンズ面が凸面の正レンズ、そして両レンズ
面が凸面の正レンズより構成している。In each numerical example, the first lens unit includes a negative meniscus eleventh lens having a convex surface facing the object side, a positive lens having both lens surfaces convex, and a positive meniscus lens. I have. The fourth lens unit is composed of a negative lens having both lens surfaces concave, a positive lens having both lens surfaces convex, and a positive lens having both lens surfaces convex.
【００３９】本実施形態では以上のようにレンズ構成を
設定することにより、全変倍範囲にわたり、又、物体距
離全体にわたり高い光学性能を得ている。In this embodiment, by setting the lens configuration as described above, high optical performance is obtained over the entire zoom range and over the entire object distance.
【００４０】本発明のリヤーフォーカス式のズームレン
ズは、以上のような構成を満足することにより実現され
るが、更に高変倍比を維持しつつ光学性能を良好に維持
する為には、以下の条件のうち少なくとも１つを満足す
ることが望ましい。The rear focus type zoom lens according to the present invention can be realized by satisfying the above-described configuration. To maintain the optical performance satisfactorily while maintaining a high zoom ratio, the following is required. It is desirable that at least one of the conditions is satisfied.
【００４１】(ア-1)前記第２２レンズの像側のレンズ面
の曲率半径をＲ２２２、前記第２３レンズの物体側のレ
ンズ面の曲率半径をＲ２３１とするとき(A-1) When the radius of curvature of the lens surface on the image side of the 22nd lens is R222, and the radius of curvature of the lens surface on the object side of the 23rd lens is R231
【００４２】[0042]
【数５】 (Equation 5)
【００４３】なる条件を満足することである。The following condition must be satisfied.
【００４４】バリエータ（第２レンズ群）を物体側から
順に、負レンズ、負レンズ、正レンズと負レンズの接合
レンズとし、従来タイプのバリエータでは接合レンズで
あった第２負レンズと第３正レンズの間に空気層を設け
空隙レンズ作用をもたせた。この空隙レンズを積極的に
活用し条件式(1)を満足することで従来、接合レンズ面
であったバリエータの第２負レンズと第３正レンズの向
き合ったレンズ面の曲率を緩くすることを可能としてい
る。このレンズ面の曲率を緩くすることにより、高次の
球面収差や高次のコマ収差発生を少なくしている。The variator (second lens group) is, in order from the object side, a negative lens, a negative lens, a cemented lens of a positive lens and a negative lens, and the second negative lens and the third positive lens, which were cemented lenses in the conventional type variator. An air layer was provided between the lenses to provide a gap lens function. By actively utilizing the gap lens and satisfying the conditional expression (1), the curvature of the facing lens surface of the second negative lens and the third positive lens of the variator, which was conventionally a cemented lens surface, is reduced. It is possible. By reducing the curvature of the lens surface, occurrence of higher-order spherical aberration and higher-order coma aberration is reduced.
【００４５】条件式(1)の下限を超えると、空隙レンズ
自体で発生する高次球面収差が増大し収差補正困難とな
る、上限の０．５を超え１に近づくと空隙レンズ作用の
効果が薄れる。If the lower limit of conditional expression (1) is exceeded, higher-order spherical aberration occurring in the gap lens itself will increase, making it difficult to correct aberrations. If it exceeds the upper limit of 0.5 and approaches 1, the effect of the gap lens effect will be lost. Fades.
【００４６】(ア-2)前記第２３レンズの材質のアッベ数
をν２３、前記第２４レンズの材質のアッベ数をν２４
とするとき １５＜（ν２４−ν２３）＜３０…(2) なる条件を満足することである。(A-2) The Abbe number of the material of the 23rd lens is ν23, and the Abbe number of the material of the 24th lens is ν24.
The condition 15 <(ν24−ν23) <30 (2) is to be satisfied.
【００４７】(ア-3) 前記第２レンズ群の焦点距離をｆ
２、前記第２３レンズと前記第２４レンズとの接合レン
ズ面の曲率半径をＲ２３４とするとき(A-3) The focal length of the second lens group is f
2. When the radius of curvature of the cemented lens surface of the 23rd lens and the 24th lens is R234
【００４８】[0048]
【数６】 (Equation 6)
【００４９】なる条件を満足することである。前述の条
件式(1)で第２２レンズの像面側のレンズ面と第２３レ
ンズの物体側のレンズ面の曲率を緩くしたため色収差が
補正不足となる場合がある。そこでバリエータの色収差
をバランスよく補正するために、バリエータの第３レン
ズの後ろに第４レンズを接合し、条件式(2)及び(3)を満
足することで、ズーム全域に渡り色収差変動を少なく押
さえ、良好な収差補正を可能にしている。The following condition must be satisfied. Since the curvature of the lens surface on the image surface side of the 22nd lens and the lens surface on the object side of the 23rd lens in the above-mentioned conditional expression (1) are reduced, chromatic aberration may be insufficiently corrected. Therefore, in order to correct the chromatic aberration of the variator in a well-balanced manner, a fourth lens is cemented behind the third lens of the variator, and by satisfying conditional expressions (2) and (3), chromatic aberration fluctuation is reduced over the entire zoom range. Hold down and good aberration correction are possible.
【００５０】条件式(2)の下限を超えると色収差補正が
不足になり、上限を超えると現存する硝材では屈折率の
低いものとなり高次球面収差や高次コマ収差の発生が問
題になる。If the lower limit of conditional expression (2) is exceeded, chromatic aberration correction will be insufficient. If the upper limit is exceeded, the refractive index of existing glass materials will be low, and high-order spherical aberration and high-order coma aberration will occur.
【００５１】条件式(3)の下限を超えると色収差補正に
は有利となるが、この接合レンズ面での高次球面収差、
コマ収差の発生が問題となる、下限を超えると色収差補
正が不足となり、ズーム広角端から望遠端での色収差変
動が困難となる。If the lower limit of conditional expression (3) is surpassed, it is advantageous for chromatic aberration correction.
If the coma aberration is a problem, and if the lower limit is exceeded, chromatic aberration correction becomes insufficient, and chromatic aberration variation from the zoom wide-angle end to the telephoto end becomes difficult.
【００５２】上記条件を満たし第２レンズ群であるバリ
エータでの高次収差発生量と収差変動を少なく押さえる
ことにより、第３レンズ群を１枚の非球面レンズ構成で
収差補正を可能にしている。By satisfying the above conditions and suppressing the amount of high-order aberrations and aberration fluctuations in the variator as the second lens unit to a small extent, the third lens unit can be corrected with a single aspherical lens. .
【００５３】次に本発明のリヤーフォーカス式のズーム
レンズを撮影光学系として用いたビデオカメラ（光学機
器）の実施形態を図２９を用いて説明する。Next, an embodiment of a video camera (optical apparatus) using the rear focus type zoom lens of the present invention as a photographic optical system will be described with reference to FIG.
【００５４】図２９において、１０はビデオカメラ本
体、１１は本発明のズームレンズによって構成された撮
影光学系、１２は撮影光学系１１によって被写体像を受
光するＣＣＤ等の撮像素子、１３は撮像素子１２が受光
した被写体像を記録する記録手段、１４は不図示の表示
素子に表示された被写体像を観察するためのファインダ
ーである。上記表示素子は液晶パネル等によって構成さ
れ、撮像素子１２上に形成された被写体像が表示され
る。In FIG. 29, 10 is a video camera body, 11 is a photographing optical system constituted by the zoom lens of the present invention, 12 is an image pickup device such as a CCD for receiving a subject image by the photographing optical system 11, and 13 is an image pickup device Reference numeral 12 denotes a recording unit for recording the received subject image, and reference numeral 14 denotes a finder for observing the subject image displayed on a display element (not shown). The display element includes a liquid crystal panel or the like, and displays a subject image formed on the image sensor 12.
【００５５】このように本発明のズームレンズをビデオ
カメラ等の光学機器に適用することにより、小型で高い
光学性能を有する光学機器を実現している。As described above, by applying the zoom lens of the present invention to an optical device such as a video camera, an optical device having a small size and high optical performance is realized.
【００５６】以下に本発明の数値実施例を記載する。Hereinafter, numerical examples of the present invention will be described.
【００５７】各数値実施例においてＲｉは物体側より順
に第ｉ番目の面の曲率半径、Ｄｉは物体側より順に第ｉ
番目の面と第（ｉ＋１）番目の面の間隔、Ｎｉとνｉは
各々物体側より順に第ｉ番目の光学部材のガラスの屈折
率とアッベ数である。In each numerical example, Ri is the radius of curvature of the i-th surface in order from the object side, and Di is i-th surface in order from the object side.
The distance between the i-th surface and the (i + 1) -th surface, Ni and νi, are the refractive index and Abbe number of the glass of the i-th optical member in order from the object side.
【００５８】非球面形状は光軸方向にＸ軸、光軸と垂直
方向にＨ軸、光の進行方向を正とし、Ｒを近軸曲率半
径、各非球面係数をＫ，Ｂ，Ｃ，Ｄ，Ｅ，Ｆとしたと
き、The aspherical surface has an X axis in the optical axis direction, an H axis in a direction perpendicular to the optical axis, a positive traveling direction of light, R represents a paraxial radius of curvature, and each aspherical coefficient represents K, B, C, D. , E, F,
【００５９】[0059]
【数７】 (Equation 7)
【００６０】なる式で表している。This is represented by the following equation.
【００６１】また、例えば「ｅ−Ｚ」の表示は「１
０-Z」を意味する。For example, the display of “eZ” is “1”.
0- Z ".
【００６２】数値実施例において最終の２つのレンズ面
はフェースプレートやフィルター等のガラスブロックで
ある。又、前述の各条件式と数値実施例における諸数値
との関係を表１に示す。In the numerical examples, the last two lens surfaces are glass blocks such as a face plate and a filter. Table 1 shows the relationship between the above-described conditional expressions and various numerical values in the numerical examples.
【００６３】 数値実施例１ f=5.90〜57.80 fno=1:2.89〜2.95 2ω=60.6°〜6.4° r1=73.290 d1=1.30 n1=1.84666 ν1=23.9 r2=27.358 d2=5.00 n2=1.48749 ν2=70.2 r3=-185.356 d3=0.20 r4=26.768 d4=3.10 n3=1.88300 ν3=40.8 r5=98.007 d5=可変 r6=51.122 d6=0.80 n4=1.88300 ν4=40.8 r7=6.964 d7=2.83 r8=-31.195 d8=0.70 n5=1.88300 ν5=40.8 r9=36.000 d9=0.60 r10=14.590 d10=2.40 n6=1.84666 ν6=23.9 r11=-37.403 d11=0.60 n7=1.77250 ν7=49.6 r12=64.852 d12=可変 r13=（絞り） d13=2.20 ＊r14=50.190 d14=1.80 n8=1.58313 ν8=59.4 r15=-29.216 d15=可変 r16=-40.597 d16=0.70 n9=1.84666 ν9=23.8 r17=20.155 d17=2.80 n10=1.67790 ν10=54.9 ＊r18=-19.748 d18=0.50 r19=22.173 d19=1.60 n11=1.77250 ν11=49.6 r20=-154.454 d20=可変 r21=∞ d21=3.17 n12=1.51680 ν12=64.9 r22=∞ 非球面係数 r14面 r=5.01902D+01 k=-4.28770D+01 B=-2.56450D-07 C=1.20645D-07 D=1.59659D-08 E=1.63563D-09 F=-2.00233D-10 r18面 r=-1.97484D+01 k=1.79416D-01 B=2.42450D-06 C=1.88915D-07 D=-3.15899D-10 E=-1.16563D-10 F=7.84552D-13Numerical Example 1 f = 5.90 to 57.80 fno = 1: 2.89 to 2.95 2ω = 60.6 ° to 6.4 ° r1 = 73.290 d1 = 1.30 n1 = 1.84666 ν1 = 23.9 r2 = 27.358 d2 = 5.00 n2 = 1.48749 ν2 = 70.2 r3 = -185.356 d3 = 0.20 r4 = 26.768 d4 = 3.10 n3 = 1.88300 ν3 = 40.8 r5 = 98.007 d5 = variable r6 = 51.122 d6 = 0.80 n4 = 1.88300 ν4 = 40.8 r7 = 6.964 d7 = 2.83 r8 = -31.195 d8 = 0.70 n5 = 1.88300 ν5 = 40.8 r9 = 36.000 d9 = 0.60 r10 = 14.590 d10 = 2.40 n6 = 1.84666 ν6 = 23.9 r11 = -37.403 d11 = 0.60 n7 = 1.77250 ν7 = 49.6 r12 = 64.852 d12 = variable r13 = (aperture) d13 = 2.20 * r14 = 50.190 d14 = 1.80 n8 = 1.58313 ν8 = 59.4 r15 = -29.216 d15 = variable r16 = -40.597 d16 = 0.70 n9 = 1.84666 ν9 = 23.8 r17 = 20.155 d17 = 2.80 n10 = 1.67790 ν10 = 54.9 * r18 =- 19.748 d18 = 0.50 r19 = 22.173 d19 = 1.60 n11 = 1.77250 ν11 = 49.6 r20 = -154.454 d20 = variable r21 = ∞ d21 = 3.17 n12 = 1.51680 ν12 = 64.9 r22 = ∞ Aspheric coefficient r14 surface r = 5.01902D + 01 k = -4.28770D + 01 B = -2.56450D-07 C = 1.20645D-07 D = 1.59659D-08 E = 1.63563D-09 F = -2.00233D-10 r18 surface r = -1.97484D + 01 k = 1.79416 D-01 B = 2.42450D-06 C = 1.88915D-07 D = -3.15899D-10 E = -1.16563D-10 F = 7.84552D- 13
【００６４】[0064]
【表１】 [Table 1]
【００６５】 数値実施例２ f=5.91〜57.84 fno=1:2.90〜2.93 2ω=60.4°〜6.4° r1=69.352 d1=1.30 n1=1.84666 ν1=23.9 r2=27.986 d2=5.10 n2=1.49700 ν2=81.5 r3=-177.475 d3=0.20 r4=26.474 d4=3.15 n3=1.88300 ν3=40.8 r5=86.929 d5=可変 r6=46.955 d6=0.80 n4=1.88300 ν4=40.8 r7=6.790 d7=2.89 r8=-34.381 d8=0.70 n5=1.88300 ν5=40.8 r9=51.533 d9=0.60 r10=12.882 d10=2.70 n6=1.84666 ν6=23.9 r11=-36.547 d11=0.60 n7=1.83481 ν7=42.7 r12=29.002 d12=可変 r13=（絞り） d13=2.20 ＊r14=39.181 d14=1.80 n8=1.58313 ν8=59.4 r15=-32.638 d15=可変 r16=-40.263 d16=0.70 n9=1.84666 ν9=23.9 r17=19.663 d17=2.80 n10=1.67790 ν10=54.9 ＊r18=-19.463 d18=0.50 r19=21.386 d19=1.85 n11=1.77250 ν11=49.6 r20=-195.606 d20=可変 r21=∞ d21=3.17 n12=1.51680 ν12=64.2 r22=∞ 非球面係数 r14面 r=3.91813D+01 k=-3.29956D+01 B=3.11655D-05 C=-2.69492D-07 D=-2.37202D-08 E=3.10037D-09 F=-1.59613D-10 r18面 r=-1.94634D+01 k=2.36307D-01 B=7.95708D-06 C=1.41805D-07 D=-7.93131D-09 E=1.43526D-10 F=3.95032D-13Numerical Example 2 f = 5.91 to 57.84 fno = 1: 2.90 to 2.93 2ω = 60.4 ° to 6.4 ° r1 = 69.352 d1 = 1.30 n1 = 1.84666 ν1 = 23.9 r2 = 27.986 d2 = 5.10 n2 = 1.49700 ν2 = 81.5 r3 = -177.475 d3 = 0.20 r4 = 26.474 d4 = 3.15 n3 = 1.88300 ν3 = 40.8 r5 = 86.929 d5 = variable r6 = 46.955 d6 = 0.80 n4 = 1.88300 ν4 = 40.8 r7 = 6.790 d7 = 2.89 r8 = -34.381 d8 = 0.70 n5 = 1.88300 ν5 = 40.8 r9 = 51.533 d9 = 0.60 r10 = 12.882 d10 = 2.70 n6 = 1.84666 ν6 = 23.9 r11 = -36.547 d11 = 0.60 n7 = 1.83481 ν7 = 42.7 r12 = 29.002 d12 = variable r13 = (aperture) d13 = 2.20 * r14 = 39.181 d14 = 1.80 n8 = 1.58313 ν8 = 59.4 r15 = -32.638 d15 = variable r16 = -40.263 d16 = 0.70 n9 = 1.84666 ν9 = 23.9 r17 = 19.663 d17 = 2.80 n10 = 1.67790 ν10 = 54.9 * r18 =- 19.463 d18 = 0.50 r19 = 21.386 d19 = 1.85 n11 = 1.77250 ν11 = 49.6 r20 = -195.606 d20 = variable r21 = ∞ d21 = 3.17 n12 = 1.51680 ν12 = 64.2 r22 = ∞ Aspheric coefficient r14 surface r = 3.91813D + 01 k = -3.29956D + 01 B = 3.11655D-05 C = -2.69492D-07 D = -2.37202D-08 E = 3.10037D-09 F = -1.59613D-10 r18 surface r = -1.94634D + 01 k = 2.36307D-01 B = 7.95708D-06 C = 1.41805D-07 D = -7.93131D-09 E = 1.43526D-10 F = 3.95032D- 13
【００６６】[0066]
【表２】 [Table 2]
【００６７】 数値実施例３ f=5.91〜57.79 fno=1:2.90〜3.01 2ω=59.2°〜6.02° r1=68.270 d1=1.35 n1=1.84666 ν1=23.9 r2=27.077 d2=5.60 n2=1.48749 ν2=70.2 r3=-127.735 d3=0.20 r4=25.006 d4=3.35 n3=1.83481 ν3=42.7 r5=84.576 d5=可変 r6=39.094 d6=0.80 n4=1.88300 ν4=40.8 r7=6.603 d7=2.92 r8=-34.526 d8=0.70 n5=1.88300 ν5=40.8 r9=38.104 d9=0.60 r10=12.977 d10=2.70 n6=1.84666 ν6=23.9 r11=-36.129 d11=0.60 n7=1.83481 ν7=42.7 r12=35.704 d12=可変 r13=（絞り） d13=2.20 ＊r14=44.157 d14=1.80 n8=1.58313 ν8=59.4 r15=-28.817 d15=可変 r16=-37.417 d16=0.70 n9=1.84666 ν9=23.9 r17=18.709 d17=2.80 n10=1.67790 ν10=54.9 ＊r18=-20.373 d18=0.50 r19=20.715 d19=1.80 n11=1.77250 ν11=49.6 r20=-92.038 d20=可変 r21=∞ d21=3.17 n12=1.51680 ν12=64.2 r22=∞ 非球面係数 r14面 r=4.41567D+01 k=-3.79319D+01 B=1.28884D-05 C=-2.45252D-08 D=3.55930D-08 E=7.85890D-10 F=-2.43503D-10 r18面 r=-2.03734D+01 k=-1.30631D-01 B=3.41480D-06 C=1.83231D-07 D=-2.36926D-09 E=-2.35948D-11 F=3.24000D-13Numerical Example 3 f = 5.91 to 57.79 fno = 1: 2.90 to 3.01 2ω = 59.2 ° to 6.02 ° r1 = 68.270 d1 = 1.35 n1 = 1.84666 ν1 = 23.9 r2 = 27.077 d2 = 5.60 n2 = 1.48749 ν2 = 70.2 r3 = -127.735 d3 = 0.20 r4 = 25.006 d4 = 3.35 n3 = 1.83481 ν3 = 42.7 r5 = 84.576 d5 = variable r6 = 39.094 d6 = 0.80 n4 = 1.88300 ν4 = 40.8 r7 = 6.603 d7 = 2.92 r8 = -34.526 d8 = 0.70 n5 = 1.88300 ν5 = 40.8 r9 = 38.104 d9 = 0.60 r10 = 12.977 d10 = 2.70 n6 = 1.84666 ν6 = 23.9 r11 = -36.129 d11 = 0.60 n7 = 1.83481 ν7 = 42.7 r12 = 35.704 d12 = variable r13 = (aperture) d13 = 2.20 * r14 = 44.157 d14 = 1.80 n8 = 1.58313 ν8 = 59.4 r15 = -28.817 d15 = variable r16 = -37.417 d16 = 0.70 n9 = 1.84666 ν9 = 23.9 r17 = 18.709 d17 = 2.80 n10 = 1.67790 ν10 = 54.9 * r18 =- 20.373 d18 = 0.50 r19 = 20.715 d19 = 1.80 n11 = 1.77250 ν11 = 49.6 r20 = -92.038 d20 = variable r21 = ∞ d21 = 3.17 n12 = 1.51680 ν12 = 64.2 r22 = ∞ Aspheric coefficient r14 surface r = 4.41567D + 01 k = -3.79319D + 01 B = 1.28884D-05 C = -2.45252D-08 D = 3.55930D-08 E = 7.85890D-10 F = -2.43503D-10 r18 surface r = -2.03734D + 01 k =- 1.30631D-01 B = 3.41480D-06 C = 1.83231D-07 D = -2.36926D-09 E = -2.35948D-11 F = 3.24000D -13
【００６８】[0068]
【表３】 [Table 3]
【００６９】 数値実施例４ f=6.00〜58.83 fno=1:2.89〜3.00 2ω=58.2°〜6.4° r1=70.307 d1=1.30 n1=1.84666 ν1=23.9 r2=26.658 d2=5.10 n2=1.48749 ν2=70.2 r3=-175.593 d3=0.20 r4=26.160 d4=3.15 n3=1.88300 ν3=40.8 r5=93.149 d5=可変 r6=30.946 d6=0.80 n4=1.88300 ν4=40.8 r7=6.518 d7=2.99 r8=-36.767 d8=0.70 n5=1.88300 ν5=40.8 r9=38.324 d9=0.60 r10=12.527 d10=2.70 n6=1.84666 ν6=23.9 r11=-65.030 d11=0.60 n7=1.83481 ν7=42.7 r12=29.726 d12=可変 r13=（絞り） d13=2.20 ＊r14=42.592 d14=1.80 n8=1.58313 ν8=59.4 r15=-24.975 d15=可変 r16=-40.384 d16=0.70 n9=1.84666 ν9=23.9 r17=18.252 d17=2.80 n10=1.67790 ν10=54.9 ＊r18=-19.890 d18=0.50 r19=20.267 d19=1.80 n11=1.77250 ν11=49.6 r20=-199.591 d20=5.00 r21=∞ d21=3.17 n12=1.51680 ν12=64.2 r22=∞ 非球面係数 r14面 r=4.25924D+01 k=-3.51255D+01 B=1.27254D-05 C=-2.17513D-07 D=2.57324D-08 E=1.69969D-09 F=-2.13852D-10 r18面 r=-1.98900D+01 k=-1.17923D-01 B=1.39270D-07 C=9.06409D-08 D=2.70260D-09 E=-1.94211D-10 F=1.65295D-12Numerical Example 4 f = 6.00 to 58.83 fno = 1: 2.89 to 3.00 2ω = 58.2 ° to 6.4 ° r1 = 70.307 d1 = 1.30 n1 = 1.84666 ν1 = 23.9 r2 = 26.658 d2 = 5.10 n2 = 1.48749 ν2 = 70.2 r3 = -175.593 d3 = 0.20 r4 = 26.160 d4 = 3.15 n3 = 1.88300 ν3 = 40.8 r5 = 93.149 d5 = variable r6 = 30.946 d6 = 0.80 n4 = 1.88300 ν4 = 40.8 r7 = 6.518 d7 = 2.99 r8 = -36.767 d8 = 0.70 n5 = 1.88300 ν5 = 40.8 r9 = 38.324 d9 = 0.60 r10 = 12.527 d10 = 2.70 n6 = 1.84666 ν6 = 23.9 r11 = -65.030 d11 = 0.60 n7 = 1.83481 ν7 = 42.7 r12 = 29.726 d12 = variable r13 = (aperture) d13 = 2.20 * r14 = 42.592 d14 = 1.80 n8 = 1.58313 ν8 = 59.4 r15 = -24.975 d15 = variable r16 = -40.384 d16 = 0.70 n9 = 1.84666 ν9 = 23.9 r17 = 18.252 d17 = 2.80 n10 = 1.67790 ν10 = 54.9 * r18 =- 19.890 d18 = 0.50 r19 = 20.267 d19 = 1.80 n11 = 1.77250 ν11 = 49.6 r20 = -199.591 d20 = 5.00 r21 = ∞ d21 = 3.17 n12 = 1.51680 ν12 = 64.2 r22 = ∞ Aspheric coefficient r14 surface r = 4.25924D + 01 k = -3.51255D + 01 B = 1.27254D-05 C = -2.17513D-07 D = 2.57324D-08 E = 1.69969D-09 F = -2.13852D-10 r18 surface r = -1.98900D + 01 k =- 1.17923D-01 B = 1.39270D-07 C = 9.06409D-08 D = 2.70260D-09 E = -1.94211D-10 F = 1.65295D-12
【００７０】[0070]
【表４】 [Table 4]
【００７１】 数値実施例５ f=6.01〜59.01 fno=1:2.89〜2.89 2ω=59.8°〜6.4° r1=64.967 d1=1.30 n1=1.84666 ν1=23.9 r2=29.027 d2=5.15 n2=1.48749 ν2=70.2 r3=-177.652 d3=0.20 r4=25.154 d4=3.05 n3=1.88481 ν3=42.7 r5=61.808 d5=可変 r6=34.762 d6=0.80 n4=1.88300 ν4=40.8 r7=6.432 d7=2.85 r8=-27.224 d8=0.70 n5=1.88300 ν5=40.8 r9=41.608 d9=0.60 r10=13.918 d10=2.70 n6=1.84666 ν6=23.9 r11=-28.983 d11=0.60 n7=1.83481 ν7=42.7 r12=53.374 d12=可変 r13=（絞り） d13=2.20 ＊r14=36.600 d14=1.80 n8=1.58313 ν8=59.4 r15=-28.083 d15=可変 r16=-44.150 d16=0.70 n9=1.84666 ν9=23.9 r17=20.380 d17=2.80 n10=1.67790 ν10=54.9 r18=-22.314 d18=0.50 r19=29.859 d19=1.95 n11=1.77250 ν11=49.6 r20=-94.191 d20=5.00 r21=∞ d21=3.17 n12=1.51680 ν12=64.2 r22=∞ 非球面係数 r14面 r=3.66003D+01 k=-2.21824D+01 B=1.91217D-05 C=-9.28714D-07 D=3.22454D-08 E=1.31625D-09 F=-8.90730D-1Numerical Example 5 f = 6.01 to 59.01 fno = 1: 2.89 to 2.89 2ω = 59.8 ° to 6.4 ° r1 = 64.967 d1 = 1.30 n1 = 1.84666 ν1 = 23.9 r2 = 29.027 d2 = 5.15 n2 = 1.48749 ν2 = 70.2 r3 = -177.652 d3 = 0.20 r4 = 25.154 d4 = 3.05 n3 = 1.88481 ν3 = 42.7 r5 = 61.808 d5 = variable r6 = 34.762 d6 = 0.80 n4 = 1.88300 ν4 = 40.8 r7 = 6.432 d7 = 2.85 r8 = -27.224 d8 = 0.70 n5 = 1.88300 ν5 = 40.8 r9 = 41.608 d9 = 0.60 r10 = 13.918 d10 = 2.70 n6 = 1.84666 ν6 = 23.9 r11 = -28.983 d11 = 0.60 n7 = 1.83481 ν7 = 42.7 r12 = 53.374 d12 = variable r13 = (aperture) d13 = 2.20 * r14 = 36.600 d14 = 1.80 n8 = 1.58313 ν8 = 59.4 r15 = -28.083 d15 = variable r16 = -44.150 d16 = 0.70 n9 = 1.84666 ν9 = 23.9 r17 = 20.380 d17 = 2.80 n10 = 1.67790 ν10 = 54.9 r18 = -22.314 d18 = 0.50 r19 = 29.859 d19 = 1.95 n11 = 1.77250 ν11 = 49.6 r20 = -94.191 d20 = 5.00 r21 = ∞ d21 = 3.17 n12 = 1.51680 ν12 = 64.2 r22 = ∞ Aspheric coefficient r14 surface r = 3.66003D + 01 k = -2.21824D + 01 B = 1.91217D-05 C = -9.28714D-07 D = 3.22454D-08 E = 1.31625D-09 F = -8.90730D-1
【００７２】[0072]
【表５】 [Table 5]
【００７３】 数値実施例６ f=6.01〜59.00 fno=1:2.89〜2.93 2ω=59.2°〜6.4° r1=70.577 d1=1.30 n1=1.84666 ν1=23.9 r2=28.102 d2=5.25 n2=1.48749 ν2=70.2 r3=-135.912 d3=0.20 r4=25.710 d4=3.20 n3=1.83481 ν3=42.7 r5=85.671 d5=可変 r6=48.172 d6=0.80 n4=1.88300 ν4=40.8 r7=6.784 d7=2.81 r8=-34.302 d8=0.70 n5=1.88300 ν5=40.8 r9=41.261 d9=0.60 r10=13.312 d10=2.70 n6=1.84666 ν6=23.9 r11=-35.939 d11=0.60 n7=1.83481 ν7=42.7 r12=36.888 d12=可変 r13=（絞り） d13=2.20 ＊r14=41.177 d14=1.80 n8=1.58313 ν8=59.4 r15=-29.537 d15=可変 r16=-39.851 d16=0.70 n9=1.84666 ν9=23.9 r17=19.986 d17=2.80 n10=1.67790 ν10=54.9 ＊r18=-20.589 d18=0.50 r19=22.582 d19=1.95 n11=1.77250 ν11=49.6 r20=-116.734 d20=5.00 r21=∞ d21=3.17 n12=1.51680 ν12=64.2 r22=∞ 非球面係数 r14面 r=4.11772D+01 k=-3.06458D+01 B=1.49123D-05 C=-9.25985D-08 D=1.59599D-08 E=1.57343D-09 F=-1.66189D-10 r18面 r=-2.05892D+01 k=-1.61879D-01 B=2.46942D-07 C=2.33996D-07 D=-6.83658D-09 E=2.80776D-11 F=1.30665D-12Numerical Example 6 f = 6.01 to 59.00 fno = 1: 2.89 to 2.93 2ω = 59.2 ° to 6.4 ° r1 = 70.577 d1 = 1.30 n1 = 1.84666 ν1 = 23.9 r2 = 28.102 d2 = 5.25 n2 = 1.48749 ν2 = 70.2 r3 = -135.912 d3 = 0.20 r4 = 25.710 d4 = 3.20 n3 = 1.83481 ν3 = 42.7 r5 = 85.671 d5 = variable r6 = 48.172 d6 = 0.80 n4 = 1.88300 ν4 = 40.8 r7 = 6.784 d7 = 2.81 r8 = -34.302 d8 = 0.70 n5 = 1.88300 ν5 = 40.8 r9 = 41.261 d9 = 0.60 r10 = 13.312 d10 = 2.70 n6 = 1.84666 ν6 = 23.9 r11 = -35.939 d11 = 0.60 n7 = 1.83481 ν7 = 42.7 r12 = 36.888 d12 = variable r13 = (aperture) d13 = 2.20 * r14 = 41.177 d14 = 1.80 n8 = 1.58313 ν8 = 59.4 r15 = -29.537 d15 = variable r16 = -39.851 d16 = 0.70 n9 = 1.84666 ν9 = 23.9 r17 = 19.986 d17 = 2.80 n10 = 1.67790 ν10 = 54.9 * r18 =- 20.589 d18 = 0.50 r19 = 22.582 d19 = 1.95 n11 = 1.77250 ν11 = 49.6 r20 = -116.734 d20 = 5.00 r21 = ∞ d21 = 3.17 n12 = 1.51680 ν12 = 64.2 r22 = ∞ Aspheric coefficient r14 surface r = 4.11772D + 01 k = -3.06458D + 01 B = 1.49123D-05 C = -9.25985D-08 D = 1.59599D-08 E = 1.57343D-09 F = -1.66189D-10 r18 surface r = -2.05892D + 01 k =- 1.61879D-01 B = 2.46942D-07 C = 2.33996D-07 D = -6.83658D-09 E = 2.80776D-11 F = 1.30665D-12
【００７４】[0074]
【表６】 [Table 6]
【００７５】 数値実施例７ f=6.03〜59.02 fno=1:2.87〜2.89 2ω=59.0°〜6.4° r1=62.095 d1=1.30 n1=1.84666 ν1=23.9 r2=28.268 d2=4.70 n2=1.48749 ν2=70.2 r3=-228.219 d3=0.20 r4=25.507 d4=2.95 n3=1.83481 ν3=42.7 r5=67.193 d5=可変 r6=26.771 d6=0.80 n4=1.88300 ν4=40.8 r7=6.365 d7=3.15 r8=-23.692 d8=0.70 n5=1.88300 ν5=40.8 r9=74.962 d9=0.60 r10=13.790 d10=2.50 n6=1.84666 ν6=23.9 r11=-49.225 d11=0.60 n7=1.77250 ν7=49.6 r12=33.632 d12=可変 r13=（絞り） d13=3.00 ＊r14=41.241 d14=2.00 n8=1.58313 ν8=59.4 r15=-25.592 d15=可変 r16=-29.471 d16=0.70 n9=1.84666 ν9=23.9 r17=25.818 d17=2.85 n10=1.67790 ν10=54.9 r18=-17.943 d18=0.50 r19=28.075 d19=1.80 n11=1.77250 ν11=49.6 r20=-137.571 d20=5.00 r21=∞ d21=3.17 n12=1.51680 ν12=64.2 r22=∞ 非球面係数 r14面 r=4.12412D+01 k=-2.09653D+01 B=-9.81742D-06 C=-2.33933D-07 D=7.49268D-09 E=2.16763D-09 F=-1.21645D-10Numerical Example 7 f = 6.03-59.02 fno = 1: 2.87-2.89 2ω = 59.0 ° -6.4 ° r1 = 62.095 d1 = 1.30 n1 = 1.84666 ν1 = 23.9 r2 = 28.268 d2 = 4.70 n2 = 1.48749 ν2 = 70.2 r3 = -228.219 d3 = 0.20 r4 = 25.507 d4 = 2.95 n3 = 1.83481 ν3 = 42.7 r5 = 67.193 d5 = variable r6 = 26.771 d6 = 0.80 n4 = 1.88300 ν4 = 40.8 r7 = 6.365 d7 = 3.15 r8 = -23.692 d8 = 0.70 n5 = 1.88300 ν5 = 40.8 r9 = 74.962 d9 = 0.60 r10 = 13.790 d10 = 2.50 n6 = 1.84666 ν6 = 23.9 r11 = -49.225 d11 = 0.60 n7 = 1.77250 ν7 = 49.6 r12 = 33.632 d12 = variable r13 = (aperture) d13 = 3.00 * r14 = 41.241 d14 = 2.00 n8 = 1.58313 ν8 = 59.4 r15 = -25.592 d15 = variable r16 = -29.471 d16 = 0.70 n9 = 1.84666 ν9 = 23.9 r17 = 25.818 d17 = 2.85 n10 = 1.67790 ν10 = 54.9 r18 = -17.943 d18 = 0.50 r19 = 28.075 d19 = 1.80 n11 = 1.77250 ν11 = 49.6 r20 = -137.571 d20 = 5.00 r21 = ∞ d21 = 3.17 n12 = 1.51680 ν12 = 64.2 r22 = ∞ Aspheric coefficient r14 surface r = 4.12412D + 01 k = -2.09653D + 01 B = -9.81742D-06 C = -2.33933D-07 D = 7.49268D-09 E = 2.16763D-09 F = -1.21645D-10
【００７６】[0076]
【表７】 [Table 7]
【００７７】[0077]
【表８】 [Table 8]
【００７８】[0078]
【発明の効果】本発明によれば、レンズ系全体を小型化
し、高変倍比であるにもかかわらず高い光学性能を有
し、かつレンズの構成枚数を減らした簡易な構成のレン
ズ全長の短いズームレンズ及びそれを用いた光学機器を
達成することができる。According to the present invention, the entire lens system is reduced in size, has a high optical performance in spite of a high zoom ratio, and has a simple total lens length with a reduced number of lenses. A short zoom lens and an optical device using the same can be achieved.
【００７９】この他、本発明によれば変倍比１０倍に及
ぶ高変倍比でありながら、小型軽量の全変倍範囲に渡り
良好に収差補正を行った高い光学性能を有したリアーフ
ォーカス式ズームレンズを達成する事ができる。In addition, according to the present invention, a rear focus having a high zoom ratio as high as 10 times, and having a high optical performance which is excellent in correcting aberrations over the entire zoom range with a small size and light weight. Type zoom lens can be achieved.
【図１】 本発明の数値実施例１のレンズ断面図FIG. 1 is a sectional view of a lens according to a numerical example 1 of the present invention.
【図２】 本発明の数値実施例１の広角端の収差図FIG. 2 is an aberration diagram at a wide-angle end according to Numerical Embodiment 1 of the present invention.
【図３】 本発明の数値実施例１の中間の収差図FIG. 3 is an intermediate aberration diagram of the numerical example 1 of the present invention.
【図４】 本発明の数値実施例１の望遠端の収差図FIG. 4 is an aberration diagram at a telephoto end in Numerical Embodiment 1 of the present invention.
【図５】 本発明の数値実施例２のレンズ断面図FIG. 5 is a sectional view of a lens according to a numerical example 2 of the present invention.
【図６】 本発明の数値実施例２の広角端の収差図FIG. 6 is an aberration diagram at a wide angle end according to Numerical Example 2 of the present invention.
【図７】 本発明の数値実施例２の中間の収差図FIG. 7 is an intermediate aberration diagram of the numerical example 2 of the present invention.
【図８】 本発明の数値実施例２の望遠端の収差図FIG. 8 is an aberration diagram at a telephoto end in Numerical Example 2 of the present invention.
【図９】 本発明の数値実施例３のレンズ断面図FIG. 9 is a sectional view of a lens according to a numerical example 3 of the present invention.
【図１０】 本発明の数値実施例３の広角端の収差図FIG. 10 is an aberration diagram at a wide angle end according to Numerical Example 3 of the present invention.
【図１１】 本発明の数値実施例３の中間の収差図FIG. 11 is an intermediate aberration diagram of the numerical example 3 of the present invention.
【図１２】 本発明の数値実施例３の望遠端の収差図FIG. 12 is an aberration diagram at a telephoto end in Numerical Example 3 of the present invention.
【図１３】 本発明の数値実施例４のレンズ断面図FIG. 13 is a sectional view of a lens according to a numerical example 4 of the present invention.
【図１４】 本発明の数値実施例４の広角端の収差図FIG. 14 is an aberration diagram at a wide angle end according to Numerical Example 4 of the present invention.
【図１５】 本発明の数値実施例４の中間の収差図FIG. 15 is an intermediate aberration diagram of the numerical example 4 of the present invention.
【図１６】 本発明の数値実施例４の望遠端の収差図FIG. 16 is an aberration diagram at a telephoto end in Numerical Example 4 of the present invention.
【図１７】 本発明の数値実施例５のレンズ断面図FIG. 17 is a lens sectional view of a numerical example 5 of the present invention;
【図１８】 本発明の数値実施例５の広角端の収差図FIG. 18 is an aberration diagram at a wide angle end according to Numerical Example 5 of the present invention.
【図１９】 本発明の数値実施例５の中間の収差図FIG. 19 is an intermediate aberration diagram of the numerical example 5 of the present invention.
【図２０】 本発明の数値実施例５の望遠端の収差図FIG. 20 is an aberration diagram at a telephoto end in Numerical Example 5 of the present invention.
【図２１】 本発明の数値実施例６のレンズ断面図FIG. 21 is a sectional view of a lens according to a numerical example 6 of the present invention.
【図２２】 本発明の数値実施例６の広角端の収差図FIG. 22 is an aberration diagram at a wide angle end according to Numerical Example 6 of the present invention.
【図２３】 本発明の数値実施例６の中間の収差図FIG. 23 is an intermediate aberration diagram of the numerical example 6 of the present invention.
【図２４】 本発明の数値実施例６の望遠端の収差図FIG. 24 is an aberration diagram at a telephoto end in Numerical Example 6 of the present invention.
【図２５】 本発明の数値実施例７のレンズ断面図FIG. 25 is a sectional view of a lens according to a numerical example 7 of the present invention.
【図２６】 本発明の数値実施例７の広角端の収差図FIG. 26 is an aberration diagram at a wide angle end according to Numerical Example 7 of the present invention.
【図２７】 本発明の数値実施例７の中間の収差図FIG. 27 is an intermediate aberration diagram of the numerical example 7 of the present invention.
【図２８】 本発明の数値実施例７の望遠端の収差図FIG. 28 is an aberration diagram at a telephoto end in Numerical Example 7 of the present invention.
【図２９】 本発明の光学機器の要部概略図FIG. 29 is a schematic diagram of a main part of the optical apparatus of the present invention.
Ｌ１ 第１群 Ｌ２ 第２群 Ｌ３ 第３群 Ｌ４ 第４群 ＳＰ 絞り Ｇ ガラスブロック ＩＰ 像面 ｄ ｄ線 ｇ ｇ線 ΔＭ メリディオナル像面 ΔＳ サジタル像面 L1 First group L2 Second group L3 Third group L4 Fourth group SP Aperture G Glass block IP Image plane d d line g g line ΔM Meridional image plane ΔS Sagittal image plane
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 2H087 KA02 KA03 MA15 PA08 PA20 PB11 QA02 QA07 QA17 QA21 QA25 QA34 QA41 QA46 RA05 RA12 RA13 RA32 RA41 RA42 RA43 SA23 SA27 SA29 SA32 SA63 SA65 SA72 SA74 SB04 SB15 SB22 SB34 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H087 KA02 KA03 MA15 PA08 PA20 PB11 QA02 QA07 QA17 QA21 QA25 QA34 QA41 QA46 RA05 RA12 RA13 RA32 RA41 RA42 RA43 SA23 SA27 SA29 SA32 SA63 SA65 SA72 SA74 SB04 SB15 SB22 SB34
Claims (5)
の屈折力の第２群、絞り正の屈折力の第３群、そして正
の屈折力の第４群の４つのレンズ群を有し、広角端から
望遠端への変倍の際には、該第２群を像面側へ移動させ
ると共に第４群を物体側に凸状の軌跡を有するように移
動させ、合焦の際には該第４群を移動させて行い、該第
２群を物体側から順に、物体側に凸面を向けたメニスカ
ス状の負の第２１レンズ、両レンズ面が凹面の負の第２
２レンズ、両レンズ面が凸面の正の第２３レンズと負の
第２４レンズとを接合した貼合わせレンズより構成し、
該第３群は非球面を有する正の１枚のレンズにより構成
したことを特徴とするリヤーフォーカス式のズームレン
ズ。1. Four lenses of a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a fourth lens unit having a positive refractive power in order from the object side. When zooming from the wide-angle end to the telephoto end, the second unit is moved to the image plane side, and the fourth unit is moved to have a locus convex toward the object side. In focusing, the fourth unit is moved, and the second unit is sequentially moved from the object side to the negative second meniscus lens having a convex surface facing the object side, and both lens surfaces having a concave concave surface. 2
Two lenses, each composed of a cemented lens in which a positive twenty-third lens and a negative twenty-fourth lens whose both lens surfaces are convex are joined;
A rear focus type zoom lens, wherein the third group is constituted by a single positive lens having an aspheric surface.
率半径をＲ２２２、前記第２３レンズの物体側のレンズ
面の曲率半径をＲ２３１とするとき 【数１】 なる条件を満足することを特徴とする請求項１のリヤー
フォーカス式のズームレンズ。2. When the radius of curvature of the lens surface on the image side of the 22nd lens is R222, and the radius of curvature of the lens surface on the object side of the 23rd lens is R231. 2. The rear focus type zoom lens according to claim 1, wherein the following condition is satisfied.
２３、前記第２４レンズの材質のアッベ数をν２４とす
るとき １５＜（ν２４−ν２３）＜３０ なる条件を満足することを特徴とする請求項１又は２の
リヤーフォーカス式のズームレンズ。3. The Abbe number of the material of the 23rd lens is ν.
23. The rear focus type zoom lens according to claim 1, wherein a condition of 15 <(ν24−ν23) <30 is satisfied when an Abbe number of a material of the 24th lens is ν24.
記第２３レンズと前記第２４レンズとの接合レンズ面の
曲率半径をＲ２３４とするとき 【数２】 なる条件を満足することを特徴とする請求項１，２又は
３のリヤーフォーカス式のズームレンズ。4. When the focal length of the second lens group is f2 and the radius of curvature of the cemented lens surface between the 23rd lens and the 24th lens is R234. 4. The rear focus type zoom lens according to claim 1, wherein the following condition is satisfied.
フォーカス式のズームレンズを有することを特徴とする
光学機器。5. An optical apparatus comprising the rear focus type zoom lens according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000041671A JP4593716B2 (en) | 2000-02-18 | 2000-02-18 | Rear focus zoom lens and optical apparatus using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000041671A JP4593716B2 (en) | 2000-02-18 | 2000-02-18 | Rear focus zoom lens and optical apparatus using the same |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2001228395A true JP2001228395A (en) | 2001-08-24 |
| JP2001228395A5 JP2001228395A5 (en) | 2010-07-08 |
| JP4593716B2 JP4593716B2 (en) | 2010-12-08 |
Family
ID=18564869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000041671A Expired - Fee Related JP4593716B2 (en) | 2000-02-18 | 2000-02-18 | Rear focus zoom lens and optical apparatus using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4593716B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7106521B2 (en) | 2001-09-28 | 2006-09-12 | Canon Kabushiki Kaisha | Zoom lens and camera with the zoom lens |
| JP2010066661A (en) * | 2008-09-12 | 2010-03-25 | Fujinon Corp | Zoom lens and imaging apparatus |
| US7715113B2 (en) | 2007-11-15 | 2010-05-11 | Fujinon Corporation | Zoom lens and imaging apparatus |
| CN114624869A (en) * | 2022-03-10 | 2022-06-14 | 长春通视光电技术有限公司 | High-resolution and large-zoom-ratio optical system and zoom lens adopting same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04208912A (en) * | 1990-12-03 | 1992-07-30 | Nikon Corp | High magnifying power zoom lens |
| JPH1144845A (en) * | 1997-07-25 | 1999-02-16 | Canon Inc | Rear focus type zoom lens provided with vibration-proof function and image pickup device using the same |
| JPH11258502A (en) * | 1998-03-10 | 1999-09-24 | Canon Inc | Zoom lens and optical unit using the same |
-
2000
- 2000-02-18 JP JP2000041671A patent/JP4593716B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04208912A (en) * | 1990-12-03 | 1992-07-30 | Nikon Corp | High magnifying power zoom lens |
| JPH1144845A (en) * | 1997-07-25 | 1999-02-16 | Canon Inc | Rear focus type zoom lens provided with vibration-proof function and image pickup device using the same |
| JPH11258502A (en) * | 1998-03-10 | 1999-09-24 | Canon Inc | Zoom lens and optical unit using the same |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7106521B2 (en) | 2001-09-28 | 2006-09-12 | Canon Kabushiki Kaisha | Zoom lens and camera with the zoom lens |
| US7715113B2 (en) | 2007-11-15 | 2010-05-11 | Fujinon Corporation | Zoom lens and imaging apparatus |
| JP2010066661A (en) * | 2008-09-12 | 2010-03-25 | Fujinon Corp | Zoom lens and imaging apparatus |
| CN114624869A (en) * | 2022-03-10 | 2022-06-14 | 长春通视光电技术有限公司 | High-resolution and large-zoom-ratio optical system and zoom lens adopting same |
| CN114624869B (en) * | 2022-03-10 | 2024-03-29 | 长春通视光电技术股份有限公司 | High-resolution and large-zoom-ratio optical system and zoom lens adopting same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4593716B2 (en) | 2010-12-08 |
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