JP2001066501A - Zoom lens - Google Patents
Zoom lensInfo
- Publication number
- JP2001066501A JP2001066501A JP23778199A JP23778199A JP2001066501A JP 2001066501 A JP2001066501 A JP 2001066501A JP 23778199 A JP23778199 A JP 23778199A JP 23778199 A JP23778199 A JP 23778199A JP 2001066501 A JP2001066501 A JP 2001066501A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- group
- lens group
- refractive power
- object side
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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- Lenses (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はズームレンズに関し、さ
らに詳しくはそのフォーカシング動作に好適な構成を有
するズームレンズに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom lens, and more particularly, to a zoom lens having a structure suitable for its focusing operation.
【０００２】[0002]
【従来の技術】ズームレンズのフォーカシングの方式と
しては、第１レンズ群を繰り出す、いわゆる１群繰り出
し方式が一般的である。この１群繰り出し方式は、同一
距離の物体へのフォーカシングに要する第１レンズ群の
繰り出し量が、ズームポジションに依存しないと云う利
点があり、広く用いられている。また、モーター駆動に
よりフォーカシングをおこなう場合、移動するレンズ群
を小型化するため、第１レンズ群を分割し、第１レンズ
群の一部を移動する方式が提案されている。例えば、特
開平２−２０１３１０号公報には、第１レンズ群を、負
屈折力の第１レンズ群前群と負屈折力の第１レンズ群後
群とに分割し、フォーカシングに際して第１レンズ群後
群を移動させる方式が提案されている。また、特開平７
−１４０３８８号公報には、第１レンズ群を負屈折力の
第１レンズ群前群と正屈折力の第１レンズ群後群とに分
割し、フォーカシングに際して第１レンズ群後群を移動
させる方式が提案されている。さらに、特開平１０−８
２９５５号公報には、第１レンズ群を負屈折力の第１レ
ンズ群前群と正屈折力の第１レンズ群後群とに分割し、
フォーカシングに際して第１レンズ群前群を移動させる
方式が提案されている。2. Description of the Related Art As a focusing system of a zoom lens, a so-called one-group extending system in which a first lens group is extended is generally used. The one-group extension method is widely used because it has an advantage that the extension amount of the first lens group required for focusing on an object at the same distance does not depend on the zoom position. In addition, when focusing is performed by driving a motor, a method of dividing the first lens group and moving a part of the first lens group has been proposed in order to reduce the size of the moving lens group. For example, Japanese Patent Application Laid-Open No. Hei 2-201310 discloses that the first lens group is divided into a front lens group having a negative refractive power and a rear lens group having a negative refractive power. A method of moving the rear group has been proposed. Also, Japanese Patent Application Laid-Open
JP-A-140388 discloses a method in which the first lens group is divided into a front lens group having a negative refractive power and a rear lens group having a positive refractive power, and the rear group of the first lens group is moved during focusing. Has been proposed. Further, JP-A-10-8
Japanese Patent No. 2955 discloses that the first lens group is divided into a front lens group having a negative refractive power and a rear lens group having a positive refractive power.
A method of moving the front group of the first lens group during focusing has been proposed.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、特開平
１０−８２９５５号公報に記載のズームレンズは、第１
レンズ群を分割したにもかかわらず、フォーカシングに
際して移動する第１レンズ群前群の大きさが大きかっ
た。そして、特開平２−２０１３１０号公報および特開
平７−１４０３８８号公報に記載のズームレンズもま
た、第１レンズ群前群を負屈折力としているため、第１
レンズ群を通過した光束が発散され、フォーカシングに
際して移動する第１レンズ群後群の有効径を小さくでき
ず、小型化の効果が少なかった。さらに、特開平２−２
０１３１０号公報に記載のズームレンズは、第１レンズ
群後群が物体側へ移動するため、第１レンズ群前群と第
１レンズ群後群との間隔を確保しなければならず、最短
合焦距離を短くすることが困難であった。However, the zoom lens described in Japanese Patent Application Laid-Open No. H10-82955 has
Despite the division of the lens unit, the size of the front group of the first lens unit that moves during focusing is large. The zoom lenses described in JP-A-2-201310 and JP-A-7-140388 also use the first lens unit front group as a negative refracting power.
The luminous flux passing through the lens group is diverged, and the effective diameter of the rear group of the first lens group, which moves during focusing, cannot be reduced, and the effect of miniaturization is small. Further, Japanese Patent Laid-Open No. 2-2
In the zoom lens described in JP-A-01310, since the rear group of the first lens group moves to the object side, an interval between the front group of the first lens group and the rear group of the first lens group must be ensured. It was difficult to shorten the focal length.
【０００４】本発明においては、同一距離の物体へのフ
ォーカシングに際して移動するレンズ群の移動量を一定
としながらも、フォーカシングに際して移動するレンズ
群、特にその有効径が小さいズームレンズを提供するこ
とを目的としている。It is an object of the present invention to provide a zoom lens having a small effective diameter, particularly a lens group which moves during focusing while keeping the amount of movement of the lens group which moves when focusing on an object at the same distance. And
【０００５】[0005]
【課題を解決するための手段】上述の目的を達成するた
めに、本発明では、物体側から順に、負の屈折力を有す
る第１レンズ群と正の屈折力を有する第２レンズ群とか
らなり、ズーミングに際して、前記第１レンズ群と前記
第２レンズ群との間隔が変化するズームレンズであっ
て、前記第１レンズ群が、ズーミングに際して互いの間
隔が変化しない、正の屈折力を有する第１レンズ群前群
と負の屈折力を有する第１レンズ群後群とからなり、フ
ォーカシングに際して、前記第１レンズ群後群のみが移
動することを特徴とするズームレンズを構成する。In order to achieve the above object, according to the present invention, a first lens unit having a negative refractive power and a second lens unit having a positive refractive power are sequentially arranged from the object side. A zoom lens in which the distance between the first lens group and the second lens group changes during zooming, wherein the first lens group has a positive refractive power such that the distance between the first lens group and the second lens group does not change during zooming. A zoom lens system includes a front lens group of the first lens group and a rear lens group of the first lens group having a negative refractive power, wherein only the rear lens group of the first lens group moves during focusing.
【０００６】[0006]
【発明の実施の形態】本発明のズームレンズは、物体側
から順に、負の屈折力を有する第１レンズ群と正の屈折
力を有する第２レンズ群からなり、広角端から望遠端へ
のズーミングに際して、前記第１レンズ群と前記第２レ
ンズ群との間隔が変化するズームレンズにおいて、前記
第１レンズ群は正の屈折力を有する第１レンズ群前群、
負の屈折力を有する第１レンズ群後群からなり、フォー
カシングに際して、前記第１レンズ群後群が移動するこ
とを特徴としている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A zoom lens according to the present invention comprises, in order from an object side, a first lens unit having a negative refractive power and a second lens unit having a positive refractive power. In a zoom lens in which a distance between the first lens group and the second lens group changes during zooming, the first lens group is a front lens group having a positive refractive power;
The first lens unit includes a rear group having a negative refractive power, and the rear group of the first lens group moves during focusing.
【０００７】そして、負の屈折力を有する第１レンズ群
において、第１レンズ群前群に正の屈折力を与えること
で、第１レンズ群前群を通過した光束は収斂されるた
め、第１レンズ群後群の有効径を小さくすることができ
る。また、第１レンズ群前群と第１レンズ群後群とに異
なる符号の屈折力を与えることにより、第１レンズ群後
群の負屈折力を、第１レンズ群全体の負屈折力よりも強
くすることができ、結果として第１レンズ群後群のフォ
ーカシング移動量を小さくすることができる。そしてこ
のとき、第１レンズ群前群および第１レンズ群後群の屈
折力については、以下の条件式を満足することが望まし
い。 （１） ｜ｆ１Ｆ／ｆ１｜ ＜ ０．７ （２） ０．２ ＜ ｆ１Ｒ／ｆ１ ＜ ０．５ ただし、ｆ１Ｆ：第１レンズ群前群の焦点距離、 ｆ１：無限遠合焦時における第１レンズ群の合成焦点距
離、 ｆ１Ｒ：第１レンズ群後群の焦点距離である。In the first lens group having a negative refractive power, by giving a positive refractive power to the front group of the first lens group, the light beam passing through the front group of the first lens group is converged. The effective diameter of the rear group of one lens group can be reduced. Further, by giving different refractive powers to the front group of the first lens group and the rear group of the first lens group, the negative refractive power of the rear group of the first lens group is made smaller than the negative refractive power of the entire first lens group. As a result, the focusing movement amount of the rear group of the first lens group can be reduced. At this time, it is desirable that the refractive powers of the first lens group front group and the first lens group rear group satisfy the following conditional expressions. (1) | f1F / f1 | <0.7 (2) 0.2 <f1R / f1 <0.5, where f1F is the focal length of the front group of the first lens unit, f1: the first at the time of focusing on infinity. F1R: the focal length of the rear group of the first lens group.
【０００８】条件式（１）は第１レンズ群前群の第１レ
ンズ群全体に対する適切な焦点距離（すなわち屈折力の
逆数）の比を示している。条件式（１）の上限を超える
と、第１レンズ群前群の屈折力が弱まり、第１レンズ群
後群のフォーカシング移動量が増大するので好ましくな
い。また、第１レンズ群後群の小型化も困難となるので
好ましくない。[0008] Conditional expression (1) indicates an appropriate ratio of the focal length (ie, the reciprocal of the refractive power) of the front group of the first lens unit to the entire first lens unit. Exceeding the upper limit of conditional expression (1) is not preferable because the refractive power of the front group of the first lens unit is weakened and the amount of focusing movement of the rear unit of the first lens unit is increased. Also, it is difficult to reduce the size of the rear group of the first lens group, which is not preferable.
【０００９】条件式（２）は第１レンズ群後群の第１レ
ンズ群に対する適切な焦点距離（すなわち屈折力の逆
数）の比を示している。条件式（２）の上限を超える
と、第１レンズ群後群のフォーカシング移動量が大きく
なり好ましくない。一方、条件式（２）の下限を下回る
と、第１レンズ群後群の屈折力が強くなり過ぎ、フォー
カシングによる収差変動の補正が困難になり好ましくな
い。Conditional expression (2) shows an appropriate ratio of the focal length (ie, the reciprocal of the refractive power) of the rear group of the first lens group to the first lens group. If the upper limit of conditional expression (2) is exceeded, the amount of focusing movement of the rear group of the first lens unit will be undesirably large. On the other hand, when the value goes below the lower limit of conditional expression (2), the refractive power of the rear group of the first lens group becomes too strong, and it becomes difficult to correct aberration fluctuations by focusing.
【００１０】次に、レンズ全系の屈折力構成としては、
前記第２レンズ群が、ズーミングに際して互いの間隔が
変化する、正の屈折力を有する第２レンズ群前群と、正
または負の屈折力を有する第２レンズ群後群とからなる
ことが望ましい。さらに、前記第２レンズ群後群は、ズ
ーミングに際して互いの間隔が変化する、負の屈折力を
有する第２レンズ群後群前群、正の屈折力を有する第２
レンズ群後群後群からなることが望ましい。つまり、全
体として、負の屈折力を有する第１レンズ群、正の屈折
力を有する第２レンズ前群、負の屈折力を有する第２レ
ンズ群後群前群、正の屈折力を有する第２レンズ群後群
後群からなることが望ましい。そして、第１レンズ群を
正の第１レンズ群前群と負の第１レンズ群後群とで構成
することによって、全体の屈折力配置を「正負正負正」
として対称性を持たせることができ、本質的に歪曲収差
が生じ難い構成とすることができる。Next, as the refractive power configuration of the entire lens system,
It is preferable that the second lens group includes a front lens group having a positive refractive power and a rear lens group having a positive or negative refractive power. . Further, the second lens group rear group has a negative refractive power, the second lens group front group has a negative refractive power, and the second lens group has a positive refractive power.
It is desirable that the lens group includes a rear group and a rear group. That is, as a whole, the first lens group having a negative refractive power, the second lens front group having a positive refractive power, the second lens group front group having a negative refractive power, and the second lens group having a positive refractive power. It is desirable to include a rear group of two lens groups and a rear group. The first lens group is composed of a positive first lens group front group and a negative first lens group rear group, so that the entire refractive power arrangement is “positive, negative, positive, negative, positive”.
, And a configuration in which distortion is essentially unlikely to occur.
【００１１】次に、第１レンズ群はズーミングに際して
静止していることが好ましい。第１レンズ群がズーミン
グに際して移動すると、ズームポジションによってフォ
ーカシング群の移動量に変化が生じることがあるので好
ましくない。また、モーター駆動でズーミングをおこな
う場合、可動群は少なくて小さいことが好ましいが、大
型の第１レンズ群が移動すると、モーターへの負荷が増
大するとともに、鏡筒全体の重心が大きく移動するので
好ましくない。さらに、ズーミングに際しても、フォー
カシングに際しても、最も物体側の第１レンズ群前群が
静止しレンズ全長が変化しないことは、鏡筒を防水・防
滴あるいは防塵構造とするのに好都合である。Next, the first lens group is preferably stationary during zooming. If the first lens group moves during zooming, the amount of movement of the focusing group may change depending on the zoom position, which is not preferable. When zooming is performed by motor driving, the movable group is preferably small and small. However, when the large first lens group moves, the load on the motor increases and the center of gravity of the entire lens barrel moves greatly. Not preferred. In addition, in zooming and focusing, the fact that the front group of the first lens unit closest to the object side is stationary and the overall length of the lens does not change is advantageous for making the lens barrel a waterproof, drip-proof or dust-proof structure.
【００１２】[0012]
【実施例】以下、各実施例について添付図に基づいて説
明する。図１乃至４はそれぞれ実施例１乃至４の広角端
におけるレンズ配置図である。例えば第１図に示すよう
に、すべての実施例は物体側（図中左側）から順に、負
屈折力の第１レンズ群、正屈折力の第２レンズ群前群、
負屈折力の第２レンズ群後群前群、正屈折力の第２レン
ズ群後群後群からなるズームレンズであり、広角端から
望遠端へのズーミングに際しては、第２レンズ群後群前
群と第２レンズ群後群後群が、互いに間隔を変化させな
がら物体側に移動する。また、第１レンズ群は、正屈折
力の第１レンズ群前群と負屈折力の第１レンズ群後群か
らなり、無限遠物体から近距離物体へのフォーカシング
に際しては、第１レンズ群後群が像側に移動する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Each embodiment will be described below with reference to the accompanying drawings. FIGS. 1 to 4 are lens arrangement diagrams at the wide-angle end in Examples 1 to 4, respectively. For example, as shown in FIG. 1, all the embodiments have, in order from the object side (left side in the figure), a first lens group having a negative refractive power, a front lens group having a positive refractive power,
A zoom lens comprising a rear group of the second lens group having a negative refractive power and a rear group of the second lens group having a positive refractive power. When zooming from the wide-angle end to the telephoto end, the zoom lens is formed of a front lens group and a rear group. The rear group of the group and the rear group of the second lens group move to the object side while changing the distance from each other. The first lens unit includes a front lens unit having a positive refractive power and a rear lens unit having a negative refractive power. When focusing from an object at infinity to an object at a short distance, the first lens unit is disposed behind the first lens unit. The group moves to the image side.
【００１３】［実施例１］図１に示す実施例１のズーム
レンズにおいて、第１レンズ群前群Ｇ１Ｆは、物体側か
ら順に、物体側に凸面を向けた負メニスカスレンズと両
凸レンズとの接合正レンズ、物体側に凸面を向けた正メ
ニスカスレンズの２群３枚からなる。第１レンズ群後群
Ｇ１Ｒは、物体側から順に、物体側に凸面を向けた負メ
ニスカスレンズ、両凹レンズと物体側に凸面を向けた正
メニスカスレンズとの接合負レンズの２群３枚からな
る。第２レンズ群前群Ｇ２Ｆは、物体側から順に、両凸
レンズ、物体側に凸面を向けた正メニスカスレンズ、物
体側に凸面を向けた正メニスカスレンズと物体側に凸面
を向けた負メニスカスレンズとの接合正レンズの３群４
枚からなる。第２レンズ群後群前群Ｇ２ＲＦは、物体側
に凸面を向けた負メニスカスレンズ１枚からなる。第２
レンズ群後群後群Ｇ２ＲＲは、物体側から順に、像側に
凸面を向けた負メニスカスレンズと像側に凸面を向けた
正メニスカスレンズとの接合負レンズ、像側に凸面を向
けた正メニスカスレンズ、両凸レンズの３群４枚からな
る。[Embodiment 1] In the zoom lens according to Embodiment 1 shown in FIG. 1, the front group G1F of the first lens group includes, in order from the object side, a cemented negative meniscus lens having a convex surface facing the object side and a biconvex lens. It consists of a positive lens and a positive meniscus lens having a convex surface facing the object side. The rear group G1R of the first lens group includes, in order from the object side, a negative meniscus lens having a convex surface facing the object side, and a cemented negative lens composed of a biconcave lens and a positive meniscus lens having a convex surface facing the object side. . The front group G2F of the second lens group includes, in order from the object side, a biconvex lens, a positive meniscus lens having a convex surface facing the object side, a positive meniscus lens having a convex surface facing the object side, and a negative meniscus lens having a convex surface facing the object side. Group 4 of cemented positive lens
Consists of sheets. The second lens group rear group front group G2RF includes one negative meniscus lens having a convex surface facing the object side. Second
The rear group G2RR includes, in order from the object side, a cemented negative lens composed of a negative meniscus lens having a convex surface facing the image side and a positive meniscus lens having a convex surface facing the image side, and a positive meniscus having a convex surface facing the image side. It consists of four lenses in three groups: a lens and a biconvex lens.
【００１４】［実施例２］図２に示す実施例２のズーム
レンズにおいて、第１レンズ群前群Ｇ１Ｆは、物体側か
ら順に、物体側に凸面を向けた負メニスカスレンズと両
凸レンズとの接合正レンズ、物体側に凸面を向けた正メ
ニスカスレンズの２群３枚からなる。第１レンズ群後群
Ｇ１Ｒは、物体側から順に、両凹レンズ、両凹レンズと
物体側に凸面を向けた正メニスカスレンズとの接合負レ
ンズの２群３枚からなる。第２レンズ群前群Ｇ２Ｆは、
物体側から順に、両凸レンズ、物体側に凸面を向けた正
メニスカスレンズ、両凸レンズと像側に凸面を向けた負
メニスカスレンズとの接合正レンズの３群４枚からな
る。第２レンズ群後群前群Ｇ２ＲＦは、物体側に凸面を
向けた負メニスカスレンズ１枚からなる。第レンズ群後
群後群Ｇ２ＲＲは、物体側から順に、像側に凸面を向け
た負メニスカスレンズと像側に凸面を向けた正メニスカ
スレンズとの接合負レンズ、両凸レンズの２群３枚から
なる。[Embodiment 2] In the zoom lens of Embodiment 2 shown in FIG. 2, the front group G1F of the first lens unit is composed of a negative meniscus lens having a convex surface facing the object side and a biconvex lens in order from the object side. It consists of a positive lens and a positive meniscus lens having a convex surface facing the object side. The rear subgroup G1R of the first lens group includes, in order from the object side, a biconcave lens, and a negative two-group cemented lens of a biconcave lens and a positive meniscus lens having a convex surface facing the object side. The front group G2F of the second lens group is
In order from the object side, there are three groups of four lenses: a biconvex lens, a positive meniscus lens having a convex surface facing the object side, and a cemented positive lens of a biconvex lens and a negative meniscus lens having a convex surface facing the image side. The second lens group rear group front group G2RF includes one negative meniscus lens having a convex surface facing the object side. The rear group G2RR of the rear group G2RR includes, in order from the object side, a cemented negative lens of a negative meniscus lens having a convex surface facing the image side and a positive meniscus lens having a convex surface facing the image side, and a bi-convex lens consisting of three lenses. Become.
【００１５】［実施例３］図３に示す実施例３のズーム
レンズにおいて、第１レンズ群前群Ｇ１Ｆは、物体側か
ら順に、物体側に凸面を向けた負メニスカスレンズと両
凸レンズとの接合正レンズ、物体側に凸面を向けた正メ
ニスカスレンズの２群３枚からなる。第１レンズ群後群
Ｇ１Ｒは、物体側から順に、両凹レンズ、両凹レンズと
両凸レンズとの接合負レンズの２群３枚からなる。第２
レンズ群前群Ｇ２Ｆは、物体側から順に、像側に凸面を
向けた正メニスカスレンズ、両凸レンズ、両凸レンズと
両凹レンズとの接合正レンズの３群４枚からなる。第２
レンズ群後群前群Ｇ２ＲＦは、物体側に凸面を向けた負
メニスカスレンズ１枚からなる。第２レンズ群Ｇ２ＲＲ
は、物体側から順に、像側に凸面を向けた負メニスカス
レンズと像側に凸面を向けた正メニスカスレンズとの接
合負レンズ、像側に凸面を向けた正メニスカスレンズ、
物体側に凸面を向けた正メニスカスレンズの３群４枚か
らなる。[Embodiment 3] In the zoom lens of Embodiment 3 shown in FIG. 3, the front group G1F of the first lens group is composed of a negative meniscus lens having a convex surface facing the object side and a biconvex lens in order from the object side. It consists of a positive lens and a positive meniscus lens having a convex surface facing the object side. The first lens group rear group G1R is composed of, in order from the object side, a biconcave lens, and two groups of three cemented negative lenses each comprising a biconcave lens and a biconvex lens. Second
The front lens group G2F includes, in order from the object, a positive meniscus lens having a convex surface facing the image side, a biconvex lens, and a cemented positive lens composed of a biconvex lens and a biconcave lens. Second
The lens group rear group front group G2RF includes one negative meniscus lens having a convex surface facing the object side. Second lens group G2RR
Is, in order from the object side, a cemented negative lens of a negative meniscus lens having a convex surface facing the image side and a positive meniscus lens having a convex surface facing the image side, a positive meniscus lens having a convex surface facing the image side,
It consists of four groups of three positive meniscus lenses with the convex surface facing the object side.
【００１６】［実施例４］図４に示す実施例４のズーム
レンズにおいて、第１レンズ群前群Ｇ１Ｆは、物体側か
ら順に、物体側に凸面を向けた負メニスカスレンズと両
凸レンズとの接合正レンズ、物体側に凸面を向けた正メ
ニスカスレンズの２群３枚からなる。第１レンズ群後群
Ｇ１Ｒは、物体側から順に、両凹レンズ、両凹レンズと
物体側に凸面を向けた正メニスカスレンズとの接合負レ
ンズの２群３枚からなる。第２レンズ群前群Ｇ２Ｆは、
物体側から順に、両凸レンズ、物体側に凸面を向けた正
メニスカスレンズ、両凸レンズと像側に凸面を向けた負
メニスカスレンズとの接合正レンズの３群４枚からな
る。第２レンズ群後群前群Ｇ２ＲＦは、物体側に凸面を
向けた負メニスカスレンズ１枚からなる。第２レンズ群
後群後群Ｇ２ＲＲは、物体側から順に、像側に凸面を向
けた負メニスカスレンズと像側に凸面を向けた正メニス
カスレンズとの接合負レンズ、両凸レンズの２群３枚か
らなる。[Embodiment 4] In the zoom lens of Embodiment 4 shown in FIG. 4, the front group G1F of the first lens unit is composed of a negative meniscus lens having a convex surface facing the object side and a biconvex lens in order from the object side. It consists of a positive lens and a positive meniscus lens having a convex surface facing the object side. The rear subgroup G1R of the first lens group includes, in order from the object side, a biconcave lens, and a negative two-group cemented lens of a biconcave lens and a positive meniscus lens having a convex surface facing the object side. The front group G2F of the second lens group is
In order from the object side, there are three groups of four lenses: a biconvex lens, a positive meniscus lens having a convex surface facing the object side, and a cemented positive lens of a biconvex lens and a negative meniscus lens having a convex surface facing the image side. The second lens group rear group front group G2RF includes one negative meniscus lens having a convex surface facing the object side. The rear group G2RR of the second lens group and the rear group G2RR are, in order from the object side, a cemented negative lens of a negative meniscus lens having a convex surface facing the image side and a positive meniscus lens having a convex surface facing the image side; Consists of
【００１７】以下の表１乃至表４に、それぞれ実施例１
乃至実施例４のレンズ諸元を示す。各表中において、ｆ
は焦点距離、βは撮像倍率、ＦはＦナンバー、２ωは画
角、Ｄ０は物体からレンズ第１面までの距離、Ｂｆはバ
ックフォーカスすなわちレンズ最終面から像面までの距
離を表す。また、左端の数字は面番号を物体側からの順
序で表し、ｒは曲率半径を、Ｄは面間隔を、ｎおよびν
は輝線スペクトルｄ線（基準波長λ＝587.6nm）に対す
る屈折率とアッベ数をそれぞれ表している。Tables 1 to 4 below show Examples 1 and 2, respectively.
9 shows lens specifications of Examples 4 to 10. In each table, f
Is the focal length, β is the imaging magnification, F is the F number, 2ω is the angle of view, D0 is the distance from the object to the first surface of the lens, and Bf is the back focus, that is, the distance from the last lens surface to the image plane. Further, the leftmost numeral represents the surface number in the order from the object side, r is the radius of curvature, D is the surface interval, n and ν
Represents the refractive index and Abbe number for the bright line spectrum d-line (reference wavelength λ = 587.6 nm).
【００１８】[0018]
【表１】 ［実施例１］ ｆ＝180.0〜250.0mm Ｆ＝ 2.0〜 2.8 ２ω＝ 20.8〜 15.1° Ｂｆ＝104.3mm r D ν n 1 203.2304 7.000 25.3 1.80518 2 111.3690 32.000 58.5 1.65160 3 -566.6884 0.500 4 116.8369 12.000 55.6 1.69680 5 142.5310 (D 5) 6 205.1176 7.000 55.6 1.69680 7 102.7315 15.000 8 -158.8916 5.000 55.6 1.69680 9 71.7597 11.000 25.3 1.80518 10 180.9492 20.000 11 (絞り) (D11) 12 1392.5237 9.000 67.9 1.59319 13 -166.4637 0.500 14 130.9250 10.000 67.9 1.59319 15 652.1610 0.500 16 74.4923 15.000 67.9 1.59319 17 407.8590 5.000 35.2 1.74950 18 110.4620 (D18) 19 146.8548 10.000 33.9 1.80384 20 59.2015 (D20) 21 -49.1931 8.000 33.9 1.80384 22 -189.0961 11.000 49.5 1.77279 23 -74.4403 0.500 24 -157.5120 12.000 58.5 1.61272 25 -75.7458 0.500 26 142.4139 11.000 58.5 1.61272 27 -2033.5841 Ｂｆ （可変間隔表） f 180.000 215.000 250.000 D 0 ∞ ∞ ∞ D 5 18.496 18.496 18.496 D11 68.906 41.631 19.025 D18 14.710 15.682 17.679 D20 25.000 51.303 71.912 β -0.0198 -0.0237 -0.0276 -0.0582 -0.0695 -0.0808 D 0 9564.252 9564.251 9564.251 3564.255 3564.255 3564.255 D 5 24.210 24.210 24.210 34.106 34.106 34.106 D11 63.192 35.917 13.311 53.297 26.022 3.415 D18 14.710 15.682 17.679 14.710 15.682 17.679 D20 25.000 51.303 71.912 25.000 51.303 71.912 （条件対応値） ｆ１Ｆ／ｆ１＝ -0.511 ｆ１Ｒ／ｆ１＝ 0.230[Table 1] [Example 1] f = 180.0 to 250.0 mm F = 2.0 to 2.8 2ω = 20.8 to 15.1 ° Bf = 104.3 mm r D ν n 1 203.2304 7.000 25.3 1.80518 2 111.3690 32.000 58.5 1.65160 3 -566.6884 0.500 4 116.8369 12.000 55.6 1.69680 5 142.5310 (D 5) 6 205.1176 7.000 55.6 1.69680 7 102.7315 15.000 8 -158.8916 5.000 55.6 1.69680 9 71.7597 11.000 25.3 1.80518 10 180.9492 20.000 11 (Aperture) (D11) 12 1392.5237 9.000 67.9 1.59319 13 -166.4637 0.500 14 130.9250 10.000 67.9 1.59319 15 652.1610 0.500 16 74.4923 15.000 67.9 1.59319 17 407.8590 5.000 35.2 1.74950 18 110.4620 (D18) 19 146.8548 10.000 33.9 1.80384 20 59.2015 (D20) 21 -49.1931 8.000 33.9 1.80384 22 -189.0961 11.000 49.5 1.77279 23 -74.4403 0.500 24 -157.5 58.5 1.61272 25 -75.7458 0.500 26 142.4139 11.000 58.5 1.61272 27 -2033.5841 Bf (variable spacing table) f 180.000 215.000 250.000 D 0 ∞ ∞ ∞ D 5 18.496 18.496 18.496 D11 68.906 41.631 19.025 D18 14.710 15.682 17.679 D20 25.000 51.303 71.912 β-0.0198 0.0237 -0.027 6 -0.0582 -0.0695 -0.0808 D 0 9564.252 9564.251 9564.251 3564.255 3564.255 3564.255 D 5 24.210 24.210 24.210 34.106 34.106 34.106 D11 63.192 35.917 13.311 53.297 26.022 3.415 D18 14.710 15.682 17.679 14.710 15.682 17.679 D20 25.000 51.000 / F1 = -0.511 f1R / f1 = 0.230
【００１９】[0019]
【表２】 ［実施例２］ ｆ＝169.8〜237.8mm Ｆ＝ 2.3〜 3.2 ２ω＝ 20.8〜 14.9° Ｂｆ＝ 41.3mm r D ν n 1 821.1497 6.000 25.3 1.80518 2 147.6374 16.500 49.5 1.77279 3 -1127.5431 0.500 4 187.8223 10.500 49.5 1.77279 5 1451.7269 (D 5) 6 -2391.1719 4.500 60.1 1.62041 7 160.0000 30.000 8 -208.3715 5.000 60.0 1.64000 9 70.7247 8.000 25.3 1.80518 10 151.9846 10.000 11 (絞り) (D11) 12 1369.2091 5.000 49.5 1.77279 13 -314.4964 0.500 14 191.2886 5.000 49.5 1.77279 15 975.1372 0.500 16 95.4052 12.500 82.5 1.49782 17 -258.3855 4.000 35.2 1.74950 18 ∞ (D18) 19 163.0000 10.000 25.3 1.80518 20 61.9968 (D20) 21 -45.0000 8.000 25.3 1.80518 22 -77.0000 9.000 49.5 1.77279 23 -55.4053 0.500 24 267.9159 9.500 49.5 1.77279 25 -200.9943 20.000 26 ∞ 60.000 64.1 1.51680 27 ∞ Ｂｆ （可変間隔表） f 169.829 200.965 237.761 D 0 ∞ ∞ ∞ D 5 27.229 27.229 27.229 D11 74.419 49.679 25.536 D18 25.415 26.198 28.357 D20 33.125 57.083 79.067 β -0.0180 -0.0213 -0.0252 -0.0451 -0.0533 -0.0631 D 0 10000.000 10000.000 10000.000 4300.000 4300.000 4300.000 D 5 33.242 33.242 33.242 41.274 41.274 41.274 D11 68.407 43.666 19.523 60.374 35.634 11.491 D18 25.415 26.198 28.357 25.415 26.198 28.357 D20 33.125 57.083 79.067 33.125 57.083 79.067 （条件対応値） ｆ１Ｆ／ｆ１＝ -0.578 ｆ１Ｒ／ｆ１＝ 0.260[Table 2] [Example 2] f = 169.8 to 237.8 mm F = 2.3 to 3.2 2ω = 20.8 to 14.9 ° Bf = 41.3 mm r D ν n 1 821.1497 6.000 25.3 1.80518 2 147.6374 16.500 49.5 1.77279 3 -1127.5431 0.500 4 187.8223 10.500 49.5 1.77279 5 1451.7269 (D 5) 6 -2391.1719 4.500 60.1 1.62041 7 160.0000 30.000 8 -208.3715 5.000 60.0 1.64000 9 70.7247 8.000 25.3 1.80518 10 151.9846 10.000 11 (Aperture) (D11) 12 1369.2091 5.000 49.5 1.77279 13 -314.4964 0.500 14 191.2886 5.000 49.5 1.77279 15 975.1372 0.500 16 95.4052 12.500 82.5 1.49782 17 -258.3855 4.000 35.2 1.74950 18 ∞ (D18) 19 163.0000 10.000 25.3 1.80518 20 61.9968 (D20) 21 -45.0000 8.000 25.3 1.80518 22 -77.0000 9.000 49.5 1.77279 23 -55.4053 0.500 26 9.500 49.5 1.77279 25 -200.9943 20.000 26 ∞ 60.000 64.1 1.51680 27 Ｂ Bf (variable interval table) f 169.829 200.965 237.761 D 0 ∞ ∞ 5 D 5 27.229 27.229 27.229 D11 74.419 49.679 25.536 D18 25.415 26.198 28.357 D20 33.125 57.0180 79.0 0.0213 -0.0252 -0.0451 -0.053 3 -0.0631 D 0 10000.000 10000.000 10000.000 4300.000 4300.000 4300.000 D5 33.242 33.242 33.242 41.274 41.274 41.274 D11 68.407 43.666 19.523 60.374 35.634 11.491 D18 25.415 26.198 28.357 25.415 26.198 28.357 D20 33.125 57.083 77.0 77.033 / 33 0.578 f1R / f1 = 0.260
【００２０】[0020]
【表３】 ［実施例３］ ｆ＝160.0〜260.0mm Ｆ＝ 2.0〜 3.3 ２ω＝ 21.4〜 13.2° Ｂｆ＝ 75.9mm r D ν n 1 180.0656 5.000 25.3 1.80518 2 94.8717 28.000 58.5 1.65160 3 -526.5972 0.500 4 121.4807 12.000 55.6 1.69680 5 141.6869 (D 5) 6 -3418.3425 7.000 55.6 1.69680 7 101.2493 15.000 8 -125.6165 5.000 55.6 1.69680 9 95.6654 11.000 25.3 1.80518 10 -696.8007 10.000 11 (絞り) (D11) 12 -1017.6233 9.000 60.0 1.64000 13 -218.2518 0.500 14 244.2384 10.000 67.9 1.59319 15 -558.4431 0.500 16 89.6400 15.000 60.0 1.64000 17 -237.7614 5.000 31.6 1.75692 18 331.7797 (D18) 19 162.8909 10.000 28.6 1.79504 20 61.5140 (D20) 21 -54.7842 8.000 31.6 1.75692 22 -147.7641 13.000 47.5 1.78797 23 -83.9803 0.500 24 -236.0083 12.000 60.1 1.62041 25 -87.3046 0.500 26 134.9659 11.000 60.1 1.62041 27 2285.3146 Ｂｆ （可変間隔表） f 160.000 210.000 260.000 D 0 ∞ ∞ ∞ D 5 19.941 19.941 19.941 D11 92.789 51.281 18.413 D18 22.606 20.140 20.581 D20 47.800 91.775 124.202 β -0.0176 -0.0231 -0.0286 -0.0513 -0.0673 -0.0834 D 0 9554.632 9554.632 9554.632 3554.632 3554.632 3554.632 D 5 25.310 25.310 25.310 34.685 34.685 34.685 D11 87.420 45.912 13.045 78.045 36.537 3.669 D18 22.606 20.140 20.581 22.606 20.140 20.581 D20 47.800 91.775 124.202 47.800 91.775 124.202 （条件対応値） ｆ１Ｆ／ｆ１＝ -0.500 ｆ１Ｒ／ｆ１＝ 0.244[Table 3] [Example 3] f = 160.0 to 260.0 mm F = 2.0 to 3.3 2ω = 21.4 to 13.2 ° Bf = 75.9 mm r D ν n 1 180.0656 5.000 25.3 1.80518 2 94.8717 28.000 58.5 1.65160 3 -526.5972 0.500 4 121.4807 12.000 55.6 1.69680 5 141.6869 (D 5) 6 -3418.3425 7.000 55.6 1.69680 7 101.2493 15.000 8 -125.6165 5.000 55.6 1.69680 9 95.6654 11.000 25.3 1.80518 10 -696.8007 10.000 11 (Aperture) (D11) 12 -1017.6233 9.000 60.0 1.64000 13 -218.2518 0.500 14 244.2384 10.000 67.9 1.59319 15 -558.4431 0.500 16 89.6400 15.000 60.0 1.64000 17 -237.7614 5.000 31.6 1.75692 18 331.7797 (D18) 19 162.8909 10.000 28.6 1.79504 20 61.5140 (D20) 21 -54.7842 8.000 31.6 1.75692 22 -147.7641 13.000 47.5 1.78797 23 -8803 0.500 24 -236.0083 12.000 60.1 1.62041 25 -87.3046 0.500 26 134.9659 11.000 60.1 1.62041 27 2285.3146 Bf (variable interval table) f 160.000 210.000 260.000 D 0 ∞ ∞ 5 D 5 19.941 19.941 19.941 D11 92.789 51.281 18.413 D18 22.606 20.140 20.581 D. β -0.0176 -0.0231- 0.0286 -0.0513 -0.0673 -0.0834 D 0 9554.632 9554.632 9554.632 3554.632 3554.632 3554.632 D 5 25.310 25.310 25.310 34.685 34.685 34.685 D11 87.420 45.912 13.045 78.045 36.537 3.669 D18 22.606 20.140 20.581 22.606 20.140. / F1 = -0.500 f1R / f1 = 0.244
【００２１】[0021]
【表４】 ［実施例４］ ｆ＝150.0〜220.0mm Ｆ＝ 2.5〜 3.7 ２ω＝ 22.9〜 15.6° Ｂｆ＝ 43.8mm r D ν n 1 4822.8178 6.000 25.3 1.80518 2 147.1804 16.500 49.5 1.77279 3 -375.7512 0.500 4 165.7061 9.000 49.5 1.77279 5 673.9784 (D 5) 6 -474.5748 4.500 60.1 1.62041 7 160.0000 10.000 8 -235.4340 5.000 60.0 1.64000 9 69.9370 8.000 25.3 1.80518 10 159.0043 (D10) 11 (絞り) (D11) 12 1258.0758 6.000 49.5 1.77279 13 -344.4097 0.500 14 179.2530 7.000 49.5 1.77279 15 961.5497 0.500 16 100.7934 15.000 82.5 1.49782 17 -221.2618 4.000 35.2 1.74950 18 -1731.5377 (D18) 19 163.0000 10.000 25.3 1.80518 20 61.9968 (D20) 21 -45.0000 8.000 25.3 1.80518 22 -77.0000 9.000 49.5 1.77279 23 -55.9562 0.500 24 292.2436 9.500 49.5 1.77279 25 -183.2566 20.000 26 ∞ 60.000 64.1 1.51680 27 ∞ Ｂｆ （可変間隔表） f 150.000 185.000 220.000 D 0 ∞ ∞ ∞ D 5 18.655 18.655 18.655 D10 26.262 26.262 26.262 D11 62.000 31.448 7.131 D18 23.075 24.927 28.126 D20 33.820 62.519 83.637 β -0.0176 -0.0218 -0.0259 -0.0426 -0.0525 -0.0624 D 0 9000.000 9000.000 9000.000 4000.000 4000.000 4000.000 D 5 24.382 24.382 24.382 31.533 31.533 31.533 D10 20.535 20.535 20.535 13.384 13.384 13.384 D11 62.000 31.448 7.131 62.000 31.448 7.131 D18 23.075 24.927 28.126 23.075 24.927 28.126 D20 33.820 62.519 83.637 33.820 62.519 83.637 （条件対応値） ｆ１Ｆ／ｆ１＝ -0.611 ｆ１Ｒ／ｆ１＝ 0.306 また、図５乃至図６には、実施例１のズームレンズの広
角端における諸収差図および望遠端における諸収差図
を、図７乃至図８には、実施例１のズームレンズのｄ０
＝3564.255mmのときの広角端における諸収差図および望
遠端における諸収差図をそれぞれ示す。図９乃至図１０
には、実施例２のズームレンズの広角端における諸収差
図および望遠端における諸収差図を、図１１乃至図１２
には、実施例２のズームレンズのｄ０＝4300mmのときの
広角端における諸収差図および望遠端における諸収差図
をそれぞれ示す。図１３乃至図１４には、実施例３のズ
ームレンズの広角端における諸収差図および望遠端にお
ける諸収差図を、図１５、図１６は実施例３のズームレ
ンズのｄ０＝3554.632mmのときの広角端における諸収差
図および望遠端における諸収差図をそれぞれ示す。図１
７、図１８は実施例４のズームレンズの広角端における
諸収差図および望遠端における諸収差図を、図１９、図
２０は実施例４のズームレンズのｄ０＝4000mmのときの
広角端における諸収差図および望遠端における諸収差図
をそれぞれ示す。Example 4 f = 150.0 to 220.0 mm F = 2.5 to 3.7 2ω = 22.9 to 15.6 ° Bf = 43.8 mm r D ν n 1 4822.8178 6.000 25.3 1.80518 2 147.1804 16.500 49.5 1.77279 3 -375.7512 0.500 4 165.7061 9.000 49.5 1.77279 5 673.9784 (D 5) 6 -474.5748 4.500 60.1 1.62041 7 160.0000 10.000 8 -235.4340 5.000 60.0 1.64000 9 69.9370 8.000 25.3 1.80518 10 159.0043 (D10) 11 (Aperture) (D11) 12 1258.0758 6.000 49.5 1.77279 13 -344.4097 0.500 14 179.2530 7.000 49.5 1.77279 15 961.5497 0.500 16 100.7934 15.000 82.5 1.49782 17 -221.2618 4.000 35.2 1.74950 18 -1731.5377 (D18) 19 163.0000 10.000 25.3 1.80518 20 61.9968 (D20) 21 -45.0000 8.000 25.3 1.80518 22 -77.0000 9.000 49.5 1.77279 23 -55.9 0.500 24 292.2436 9.500 49.5 1.77279 25 -183.2566 20.000 26 ∞ 60.000 64.1 1.51680 27 Ｂ Bf (variable interval table) f 150.000 185.000 220.000 D 0 ∞ ∞ ∞ D 5 18.655 18.655 18.655 D10 26.262 26.262 26.262 D11 62.000 31.448 7.131 D18 23.012624.927 33.820 62.519 83.637 β -0.0176 -0 .0218 -0.0259 -0.0426 -0.0525 -0.0624 D 0 9000.000 9000.000 9000.000 4000.000 4000.000 4000.000 D 5 24.382 24.382 24.382 31.533 31.533 31.533 D10 20.535 20.535 20.535 13.384 13.384 13.384 D11 62.000 31.448 7.131 62.000 31.448 2.131 D18 23.0 28.127 83.637 33.820 62.519 83.637 (Conditional value) f1F / f1 = −0.611 f1R / f1 = 0.306 FIGS. 5 to 6 show various aberration diagrams at the wide-angle end and at the telephoto end of the zoom lens according to the first embodiment. 7 and 8 show d0 of the zoom lens of the first embodiment.
The various aberration diagrams at the wide-angle end and the various aberration diagrams at the telephoto end when = 3564.255 mm are shown, respectively. 9 and 10
FIGS. 11 and 12 show various aberration diagrams at the wide-angle end and at the telephoto end of the zoom lens according to the second embodiment.
9 shows various aberration diagrams at the wide-angle end and at the telephoto end of the zoom lens of Example 2 when d0 = 4300 mm, respectively. FIGS. 13 and 14 show various aberration diagrams at the wide-angle end and at the telephoto end of the zoom lens according to the third embodiment. FIGS. 15 and 16 show the zoom lens according to the third embodiment when d0 = 3554.632 mm. Various aberration diagrams at the wide-angle end and various aberration diagrams at the telephoto end are shown, respectively. FIG.
7 and 18 show various aberration diagrams at the wide-angle end and a telephoto end of the zoom lens according to the fourth embodiment. FIGS. 19 and 20 show various aberrations at the wide-angle end when the d0 = 4000 mm of the zoom lens according to the fourth embodiment. An aberration diagram and various aberration diagrams at the telephoto end are shown, respectively.
【００２２】また、各図において、ＦＮＯはＦナンバ
ー、ＮＡは開口数、Ｙは像高、ｄはｄ線、ｇはｇ線（λ
＝435.8nm）をそれぞれ表している。非点収差図におけ
る実線はサジタル像面を、破線はメリジオナル像面をそ
れぞれ表している。収差図から明らかなように、すべて
の実施例は優れた性能を有している。特にフォーカシン
グによる収差の変動は良好に補正されている。さらに、
各収差図から明らかなように、すべての実施例は充分な
周辺光量を有している。In each of the figures, FNO is the F number, NA is the numerical aperture, Y is the image height, d is the d line, and g is the g line (λ
= 435.8 nm). A solid line in the astigmatism diagram represents a sagittal image plane, and a broken line represents a meridional image plane. As is clear from the aberration diagrams, all the examples have excellent performance. In particular, aberration fluctuation due to focusing is well corrected. further,
As is clear from the aberration diagrams, all the embodiments have a sufficient peripheral light amount.
【００２３】[0023]
【発明の効果】このように本発明によれば、同一距離の
物体へのフォーカシングレンズ群の移動量を一定としな
がらも、フォーカシングに際して移動するレンズ群、特
にその有効径が小さいズームレンズを実現できる。As described above, according to the present invention, it is possible to realize a lens group that moves during focusing, particularly a zoom lens whose effective diameter is small, while keeping the amount of movement of the focusing lens group to an object at the same distance constant. .
【図１】本発明の実施例１の広角端の無限遠合焦時にお
けるレンズ配置図FIG. 1 is a diagram illustrating a lens arrangement when focusing on infinity at a wide-angle end according to a first embodiment of the present invention.
【図２】本発明の実施例２の広角端の無限遠合焦時にお
けるレンズ配置図FIG. 2 is a lens arrangement diagram at the time of focusing on infinity at a wide-angle end according to a second embodiment of the present invention.
【図３】本発明の実施例３の広角端の無限遠合焦時にお
けるレンズ配置図FIG. 3 is a diagram illustrating a lens arrangement when focusing on infinity at the wide-angle end according to a third embodiment of the present invention.
【図４】本発明の実施例４の広角端の無限遠合焦時にお
けるレンズ配置図FIG. 4 is a lens arrangement diagram when focusing on infinity at a wide-angle end according to a fourth embodiment of the present invention.
【図５】本発明の実施例１の広角端における諸収差図FIG. 5 is a diagram illustrating various aberrations at the wide-angle end according to the first embodiment of the present invention.
【図６】本発明の実施例１の望遠端における諸収差図FIG. 6 is a diagram illustrating various aberrations at the telephoto end according to the first embodiment of the present invention.
【図７】本発明の実施例１のＤ０＝3564.255mmのときの
広角端における諸収差図FIG. 7 is a diagram illustrating various aberrations at the wide-angle end when D0 = 3564.255 mm according to the first embodiment of the present invention.
【図８】本発明の実施例１のＤ０＝3564.255mmのときの
望遠端における諸収差図FIG. 8 is a diagram illustrating various aberrations at the telephoto end when D0 = 3564.255 mm according to the first embodiment of the present invention.
【図９】本発明の実施例２の広角端における諸収差図FIG. 9 is a diagram illustrating various aberrations at the wide-angle end according to the second embodiment of the present invention.
【図１０】本発明の実施例２の望遠端における諸収差図FIG. 10 is a diagram showing various aberrations at the telephoto end according to the second embodiment of the present invention.
【図１１】本発明の実施例２のＤ０＝4300mmのときの広
角端における諸収差図FIG. 11 is a diagram illustrating various aberrations at the wide-angle end when D0 = 4300 mm according to the second embodiment of the present invention.
【図１２】本発明の実施例２のＤ０＝4300mmのときの望
遠端における諸収差図FIG. 12 is a diagram illustrating various aberrations at the telephoto end when D0 = 4300 mm according to the second embodiment of the present invention.
【図１３】本発明の実施例３の広角端における諸収差図FIG. 13 is a diagram showing various aberrations at the wide-angle end according to a third embodiment of the present invention.
【図１４】本発明の実施例３の望遠端における諸収差図FIG. 14 is a diagram illustrating various aberrations at the telephoto end according to the third embodiment of the present invention.
【図１５】本発明の実施例３のＤ０＝3554.632mmのとき
の広角端における諸収差図FIG. 15 is a diagram illustrating various aberrations at the wide-angle end when D0 = 3554.632 mm according to the third embodiment of the present invention.
【図１６】本発明の実施例３のＤ０＝3554.632mmのとき
の望遠端における諸収差図FIG. 16 is a diagram illustrating various aberrations at the telephoto end when D0 = 3554.632 mm according to the third embodiment of the present invention.
【図１７】本発明の実施例４の広角端における諸収差図FIG. 17 is a diagram showing various aberrations at the wide-angle end according to a fourth embodiment of the present invention.
【図１８】本発明の実施例４の望遠端における諸収差図FIG. 18 is a diagram showing various aberrations at the telephoto end according to a fourth embodiment of the present invention.
【図１９】本発明の実施例４のＤ０＝4000mmのときの広
角端における諸収差図FIG. 19 is a diagram illustrating various aberrations at the wide-angle end when D0 = 4000 mm according to the fourth embodiment of the present invention.
【図２０】本発明の実施例４のＤ０＝4000mmのときの望
遠端における諸収差図FIG. 20 is a diagram showing various aberrations at the telephoto end when D0 = 4000 mm in Embodiment 4 of the present invention.
Ｇ１：第１レンズ群 Ｇ１Ｆ：第１レンズ群前群 Ｇ１Ｒ：第１レンズ群後群 Ｇ２Ｆ：第２レンズ群前群 Ｇ３ＲＦ：第２レンズ群後群前群 Ｇ４ＲＲ：第２レンズ群後群後群 Ｓ：絞り G1: First lens group G1F: First lens group front group G1R: First lens group rear group G2F: Second lens group front group G3RF: Second lens group rear group front group G4RR: Second lens group rear group rear group S: Aperture
───────────────────────────────────────────────────── フロントページの続き (72)発明者 福田 充 栃木県大田原市実取770番地 株式会社栃 木ニコン内 (72)発明者 田中 要司 栃木県大田原市実取770番地 株式会社栃 木ニコン内 Ｆターム(参考） 2H087 MA18 PA10 PA11 PA16 PB14 PB15 QA02 QA06 QA07 QA17 QA21 QA25 QA32 QA34 QA41 QA45 QA46 RA32 RA42 SA24 SA26 SA30 SA32 SA63 SA64 SA72 SA75 SB07 SB15 SB22 SB34 SB35 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mitsuru Fukuda 770, Mitatori, Otawara-shi, Tochigi Pref. Inside the Toshigi Nikon Corporation (72) Inventor Yoji Tanaka 770, Mitori, Otawara-shi, Tochigi Pref. F-term (reference) 2H087 MA18 PA10 PA11 PA16 PB14 PB15 QA02 QA06 QA07 QA17 QA21 QA25 QA32 QA34 QA41 QA45 QA46 RA32 RA42 SA42 SA24 SA26 SA30 SA32 SA63 SA64 SA72 SA75 SB07 SB15 SB22 SB34 SB35
Claims (4)
レンズ群と正の屈折力を有する第２レンズ群とからな
り、ズーミングに際して、前記第１レンズ群と前記第２
レンズ群との間隔が変化するズームレンズにおいて、 前記第１レンズ群が、ズーミングに際して互いの間隔が
変化しない、正の屈折力を有する第１レンズ群前群と負
の屈折力を有する第１レンズ群後群とからなり、 フォーカシングに際して、前記第１レンズ群後群のみが
移動することを特徴とするズームレンズ。1. A first lens having a negative refractive power in order from the object side.
A second lens group having a positive refractive power; and the first lens group and the second lens group during zooming.
A zoom lens in which the distance from the lens group changes, wherein the first lens group does not change in distance during zooming, and the first lens group has a positive refractive power and the first lens group has a negative refractive power. A zoom lens comprising a rear group, wherein only the rear group of the first lens group moves during focusing.
互いの間隔が変化する、正の屈折力を有する第２レンズ
群前群と正または負の屈折力を有する第２レンズ群後群
とからなることを特徴とする請求項１に記載のズームレ
ンズ。2. The second lens group comprises a front lens group having a positive refractive power and a rear lens group having a positive or negative refractive power, the distance between which changes during zooming. The zoom lens according to claim 1, wherein:
して互いの間隔が変化する、負の屈折力を有する第２レ
ンズ群後群前群と正の屈折力を有する第２レンズ群後群
後群とからなることを特徴とする請求項２に記載のズー
ムレンズ。3. The rear group of the second lens group having a negative refractive power and the rear group of a second lens group having a positive refractive power, wherein the rear group of the second lens group changes in distance during zooming. The zoom lens according to claim 2, comprising a rear group.
ていることを特徴とする請求項１乃至請求項３のいずれ
か１項に記載のズームレンズ。4. The zoom lens according to claim 1, wherein the first lens group is stationary during zooming.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23778199A JP2001066501A (en) | 1999-08-25 | 1999-08-25 | Zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23778199A JP2001066501A (en) | 1999-08-25 | 1999-08-25 | Zoom lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001066501A true JP2001066501A (en) | 2001-03-16 |
Family
ID=17020348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23778199A Pending JP2001066501A (en) | 1999-08-25 | 1999-08-25 | Zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001066501A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006234893A (en) * | 2005-02-22 | 2006-09-07 | Canon Inc | Zoom lens and image projection device having the same |
| WO2016017725A1 (en) * | 2014-07-30 | 2016-02-04 | 株式会社ニコン | Variable-power optical system, optical device, and method for manufacturing variable-power optical system |
| US9599801B2 (en) | 2015-04-01 | 2017-03-21 | Fujifilm Corporation | Projection zoom lens and projection type display device |
| US9684157B2 (en) | 2015-04-01 | 2017-06-20 | Fujifilm Corporation | Projection zoom lens and projection type display device |
-
1999
- 1999-08-25 JP JP23778199A patent/JP2001066501A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006234893A (en) * | 2005-02-22 | 2006-09-07 | Canon Inc | Zoom lens and image projection device having the same |
| WO2016017725A1 (en) * | 2014-07-30 | 2016-02-04 | 株式会社ニコン | Variable-power optical system, optical device, and method for manufacturing variable-power optical system |
| CN106687848A (en) * | 2014-07-30 | 2017-05-17 | 株式会社尼康 | Variable-power optical system, optical device, and method for manufacturing variable-power optical system |
| JPWO2016017725A1 (en) * | 2014-07-30 | 2017-05-18 | 株式会社ニコン | Variable-magnification optical system, optical device, and variable-magnification optical system manufacturing method |
| EP3176622A4 (en) * | 2014-07-30 | 2018-03-28 | Nikon Corporation | Variable-power optical system, optical device, and method for manufacturing variable-power optical system |
| JP2019049725A (en) * | 2014-07-30 | 2019-03-28 | 株式会社ニコン | Variable power optical system, optical device, and method for manufacturing variable power optical system |
| US10254519B2 (en) | 2014-07-30 | 2019-04-09 | Nikon Corporation | Variable-power optical system, optical device, and method for manufacturing variable-power optical system |
| CN106687848B (en) * | 2014-07-30 | 2019-11-01 | 株式会社尼康 | Variable-power optical system and Optical devices |
| US9599801B2 (en) | 2015-04-01 | 2017-03-21 | Fujifilm Corporation | Projection zoom lens and projection type display device |
| US9684157B2 (en) | 2015-04-01 | 2017-06-20 | Fujifilm Corporation | Projection zoom lens and projection type display device |
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