JP2003066332A - Zoom lens - Google Patents
Zoom lensInfo
- Publication number
- JP2003066332A JP2003066332A JP2001252017A JP2001252017A JP2003066332A JP 2003066332 A JP2003066332 A JP 2003066332A JP 2001252017 A JP2001252017 A JP 2001252017A JP 2001252017 A JP2001252017 A JP 2001252017A JP 2003066332 A JP2003066332 A JP 2003066332A
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- Japan
- Prior art keywords
- lens
- refractive power
- lens group
- positive
- object side
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ズームレンズ、詳
細にはＣＣＤ等の固体撮像素子を用いた小型カメラなど
に好適なズームレンズ、特に３群からなるズームレンズ
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 suitable for a small camera using a solid-state image pickup device such as a CCD, and more particularly to a zoom lens composed of three groups.
【０００２】[0002]
【従来の技術】従来より、固体撮像素子に好適なズーム
レンズとして、例えば特開平１１−２３９６７号公報に
負レンズ群先行のズームレンズが提案されている。ま
た、特開平６−２７３７７号公報や特開平８−２７８４
４４号公報には、正レンズ群先行型のレンズが提案され
ている。2. Description of the Related Art Conventionally, as a zoom lens suitable for a solid-state image pickup device, for example, Japanese Patent Laid-Open No. 11-23967 proposes a zoom lens preceding a negative lens group. Further, JP-A-6-27377 and JP-A-8-2784.
Japanese Laid-Open Patent Publication No. 44-44 proposes a positive lens group type lens.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、正レン
ズ群先行タイプのズームレンズは、前玉径が大きくなり
やすいため、鏡筒が太くなってしまうという問題があ
る。また、レンズ全長が長くなりやすい。さらに、複雑
な構成になりやすく、小型化や沈胴厚(レンズ群間隔を
最小にした収納時のレンズ全長)を小さくするのが困難
であるという問題がある。However, the zoom lens of the positive lens group preceding type tends to have a large front lens diameter, which causes a problem that the lens barrel becomes thick. In addition, the total lens length tends to be long. Furthermore, there is a problem that the structure tends to be complicated, and it is difficult to reduce the size and the collapse thickness (lens total length when housed with a minimum lens group interval).
【０００４】また、負レンズ群先行タイプのズームレン
ズは、広角端状態での歪曲収差が目立ってしまう。さら
に、色収差を良好に補正するために、１群のレンズは接
合しないことが望ましいが、独立して配置させることに
よって、製造時の公差が厳しくなるという問題を有す
る。Further, in the zoom lens of the negative lens group preceding type, the distortion aberration in the wide-angle end state becomes conspicuous. Further, it is desirable that the lenses of the first group are not cemented in order to satisfactorily correct the chromatic aberration, but if they are arranged independently, there is a problem that the manufacturing tolerance becomes strict.
【０００５】そこで、本発明は上記問題に鑑みてなされ
たものであり、固体撮像素子等を用いたビデオカメラ、
電子スチルカメラ等に適し、小型で、ズーム比が３倍程
度で、広角端状態で６０°程度の画角を有し、諸収差、
特に歪曲収差が良好に補正され、高い生産性により容易
に量産できる、沈胴可能なズームレンズを提供すること
を目的とする。Therefore, the present invention has been made in view of the above problems, and a video camera using a solid-state image pickup device,
It is suitable for electronic still cameras, etc., is compact, has a zoom ratio of about 3 times, has an angle of view of about 60 ° in the wide-angle end state, and has various aberrations.
In particular, it is an object of the present invention to provide a retractable zoom lens in which distortion is satisfactorily corrected and mass production can be easily performed with high productivity.
【０００６】[0006]
【課題を解決するための手段】上記課題を解決するため
に、本発明は、物体側から順に、負屈折力の第１レンズ
群Ｇ１と、正屈折力の第２レンズ群Ｇ２と、正屈折力の
第３レンズ群Ｇ３とを有するズームレンズにおいて、前
記第１レンズ群Ｇ１は、物体側から順に、少なくとも、
第１の正屈折力のレンズと、負屈折力のレンズと、第２
の正屈折力のレンズとを含み、前記第２レンズ群Ｇ２
は、物体側から順に、開口絞りと、少なくとも、第１の
正屈折力のレンズと、第２の正屈折力のレンズと、負屈
折力のレンズとを含み、前記第３レンズ群Ｇ３は、少な
くとも１枚の正屈折力のレンズを含むことを特徴とする
ズームレンズを提供する。また本発明は、物体側から順
に、負屈折力の第１レンズ群Ｇ１と、正屈折力の第２レ
ンズ群Ｇ２と、正屈折力の第３レンズ群Ｇ３とを有する
ズームレンズにおいて、前記第１レンズ群Ｇ１は、物体
側から順に、少なくとも、第１の正屈折力のレンズと、
負屈折力のレンズと、第２の正屈折力のレンズとを含
み、前記第１レンズ群中の、前記第１の正屈折力のレン
ズと、前記負屈折力のレンズと、第２の正屈折力のレン
ズとは他のレンズと接合されておらず、前記第２レンズ
群Ｇ２は、物体側から順に、開口絞りと、少なくとも、
第１の正屈折力のレンズと、第２の正屈折力のレンズ
と、負屈折力のレンズとを含み、前記第３レンズ群Ｇ３
は、少なくとも１枚の、正屈折力のレンズを含むことを
特徴とするズームレンズを提供する。また本発明は、物
体側から順に、負屈折力の第１レンズ群Ｇ１と、正屈折
力の第２レンズ群Ｇ２と、正屈折力の第３レンズ群Ｇ３
とを有するズームレンズにおいて、前記第１レンズ群Ｇ
１は、物体側から順に、少なくとも、第１の正屈折力の
レンズと、負屈折力のレンズと、第２の正屈折力のレン
ズとを含み、前記第２レンズ群Ｇ２は、物体側から順
に、開口絞りと、少なくとも１枚の正屈折力のレンズ
と、負屈折力のレンズとを含み、前記正屈折力のレンズ
の中で最も厚い正屈折力のレンズは、物体側に凸面を向
けた正メニスカスレンズであり、前記第３レンズ群Ｇ３
は、少なくとも１枚の正屈折力のレンズとを含むことを
特徴とするズームレンズを提供する。In order to solve the above-mentioned problems, according to the present invention, in order from the object side, a first lens group G1 having a negative refractive power, a second lens group G2 having a positive refractive power, and a positive refractive power are provided. In the zoom lens having the third lens group G3 of power, the first lens group G1 includes at least one of, in order from the object side,
A first positive power lens, a negative power lens, and a second
And a lens having a positive refracting power,
Includes, in order from the object side, an aperture stop, at least a lens having a first positive refractive power, a lens having a second positive refractive power, and a lens having a negative refractive power, and the third lens group G3 is Provided is a zoom lens including at least one lens having a positive refractive power. According to the present invention, in the zoom lens having, in order from the object side, a first lens group G1 having negative refractive power, a second lens group G2 having positive refractive power, and a third lens group G3 having positive refractive power, The first lens group G1 includes, in order from the object side, at least a lens having a first positive refractive power,
A lens having a negative refracting power and a lens having a second positive refracting power, wherein the lens having the first positive refracting power, the lens having the negative refracting power, and the second positive refracting power in the first lens group; The lens having a refractive power is not cemented to another lens, and the second lens group G2 includes an aperture stop and at least an aperture stop in order from the object side.
The third lens group G3 includes a first positive refractive power lens, a second positive refractive power lens, and a negative refractive power lens.
Provides a zoom lens including at least one lens having a positive refractive power. Further, according to the present invention, the first lens group G1 having a negative refractive power, the second lens group G2 having a positive refractive power, and the third lens group G3 having a positive refractive power are sequentially arranged from the object side.
In the zoom lens having, the first lens group G
1 includes, in order from the object side, at least a lens having a first positive refractive power, a lens having a negative refractive power, and a lens having a second positive refractive power, and the second lens group G2 is arranged from the object side. In order, an aperture stop, at least one lens having a positive refracting power, and a lens having a negative refracting power are included, and the lens having the thickest positive refracting power among the lenses having the positive refracting power has a convex surface facing the object side. Positive meniscus lens, and the third lens group G3
Provides at least one lens of positive refracting power.
【０００７】[0007]
【発明の実施の形態】以下に、本発明の実施の形態につ
いて説明する。図1は、本発明にかかるズームレンズの
断面構成を示す図である。物体側から順に、負の屈折力
を有する第１レンズ群Ｇ１と、物体側に開口絞りＳとを
有し、正の屈折力を有する第２レンズ群Ｇ２と、正の屈
折力を有する第３レンズ群Ｇ３とを有する構成である。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. FIG. 1 is a diagram showing a cross-sectional configuration of a zoom lens according to the present invention. In order from the object side, the first lens group G1 having a negative refractive power, the aperture stop S on the object side, a second lens group G2 having a positive refractive power, and the third lens group G3 having a positive refractive power. This is a configuration including a lens group G3.
【０００８】本発明にかかるズームレンズは、沈胴時の
小型化を図る上では、第２レンズ群の小型化が重要であ
るという認識のもとで設計されている。このため、第２
レンズ群全体でのレンズの中心厚およびレンズ間の空気
間隔を抑えながら構成している。この結果、沈胴式のズ
ームレンズで問題となるレンズの総厚を最小に抑え、全
系の小型化を図りながら、諸収差を良好に補正すること
ができる。The zoom lens according to the present invention is designed with the recognition that it is important to reduce the size of the second lens group in order to reduce the size of the zoom lens when retracted. Therefore, the second
It is configured while suppressing the center thickness of the lens in the entire lens group and the air gap between the lenses. As a result, the total thickness of the lens, which is a problem in the retractable zoom lens, can be minimized, and various aberrations can be corrected well while the overall system is downsized.
【０００９】また、本発明の好ましい態様では、前記第
１レンズ群Ｇ１の前記第１の正屈折力のレンズＬ１は最
も物体側に設けられ、前記第１の正屈折力のレンズＬ１
の焦点距離をｆＬ１、前記第１レンズ群Ｇ１の焦点距離
をｆＧ１とそれぞれしたとき、以下の条件式（１）を満
足することが望ましい。Further, in a preferred aspect of the present invention, the lens L1 having the first positive refractive power of the first lens group G1 is provided closest to the object side, and the lens L1 having the first positive refractive power is provided.
It is desirable that the following conditional expression (1) is satisfied, where fL1 is the focal length of f1 and fG1 is the focal length of the first lens group G1.
【００１０】 (１) １．５＜ｆＬ１／｜ｆＧ１｜＜１２[0010] (1) 1.5 <fL1 / | fG1 | <12
【００１１】条件式（１）は、正の第１レンズ群Ｇ１の
焦点距離と前記レンズ群の最も物体側に配設された正の
屈折力を有するレンズＬ１との比を規定するものであ
る。条件式（１）の上限を上回ると、第１の正屈折力の
レンズＬ１の屈折力が非常に弱いため、広角端状態での
負の歪曲収差の補正が困難となる。また、広角端状態で
の画角を確保するために、前玉が大きくなったり、全長
の短縮が困難になる。Conditional expression (1) defines the ratio between the focal length of the first positive lens group G1 and the lens L1 disposed on the most object side of the lens group and having a positive refractive power. . When the value exceeds the upper limit of the conditional expression (1), the refractive power of the lens L1 having the first positive refractive power is very weak, so that it becomes difficult to correct the negative distortion in the wide-angle end state. Further, in order to secure the angle of view in the wide-angle end state, the front lens becomes large and it is difficult to shorten the total length.
【００１２】逆に、条件式（１）の下限を下回る場合
は、第１の正屈折力のレンズＬ１の屈折率が高い場合
と、曲率半径が小さい場合とが考えられる。第１の正屈
折力のレンズＬ１の屈折率が高い場合、画角が狭くなり
がちで、高いズーム比を確保することができない。ま
た、曲率半径が小さい場合は、球面収差など諸収差が良
好に補正できなくなる。On the other hand, if the lower limit of conditional expression (1) is not reached, it is considered that the lens L1 having the first positive refractive power has a high refractive index and the radius of curvature is small. When the refractive index of the lens L1 having the first positive refractive power is high, the angle of view tends to be narrow, and it is not possible to secure a high zoom ratio. Further, when the radius of curvature is small, it becomes impossible to satisfactorily correct various aberrations such as spherical aberration.
【００１３】また、本発明の好ましい態様では、前記第
１レンズ群Ｇ１に含まれる少なくとも１枚の前記負屈折
力のレンズは、前記第１レンズ群Ｇ１中の前記負屈折力
のレンズの物体側のレンズ面の曲率半径をｒ１、前記第
１レンズ群Ｇ１中の前記負屈折力のレンズの像側のレン
ズ面の曲率半径をｒ２とそれぞれしたとき、以下の条件
式（２）を満足することが望ましい。Further, in a preferred aspect of the present invention, at least one lens having the negative refracting power included in the first lens group G1 is an object side of the lens having the negative refracting power in the first lens group G1. Where r1 is the radius of curvature of the lens surface, and r2 is the radius of curvature of the image-side lens surface of the lens having the negative refractive power in the first lens group G1, the following conditional expression (2) must be satisfied. Is desirable.
【００１４】 (２) −１．４＜（ｒ２＋ｒ１）／（ｒ２−ｒ１）＜−０．１[0014] (2) -1.4 <(r2 + r1) / (r2-r1) <-0.1
【００１５】条件式（２）は、前記第１レンズ群Ｇ１中
の負屈折力のレンズのシェイプファクターを規定する条
件である。第１レンズ群Ｇ１は、第１レンズ群Ｇ１で発
生する色収差を補正するために、接合しないことが望ま
しい。しかし、独立して配置させると製造上の公差が厳
しくなり、量産時の歩留まりを悪くしてしまう。そこ
で、組立て時の偏芯を許容するために、少なくとも１枚
の負屈折力のレンズは、ゆるやかな曲率をもった負レン
ズであることが望ましい。すなわち、条件式（２）の上
限を上回る場合及び下限を下回る場合の何れの場合で
も、製造時の組立て公差が厳しくなってしまうため好ま
しくない。ここで、下限値は−０．８がより好ましい。Conditional expression (2) is a condition for defining the shape factor of the lens of negative refractive power in the first lens group G1. It is desirable that the first lens group G1 is not cemented in order to correct the chromatic aberration generated in the first lens group G1. However, if they are arranged independently, the manufacturing tolerance becomes strict, and the yield in mass production deteriorates. Therefore, in order to allow eccentricity at the time of assembly, it is desirable that at least one lens having a negative refractive power is a negative lens having a gentle curvature. That is, in either case where the upper limit of conditional expression (2) is exceeded or when the lower limit of conditional expression (2) is exceeded, the assembly tolerance during manufacturing becomes strict, which is not preferable. Here, the lower limit value is more preferably -0.8.
【００１６】また、本発明の好ましい態様では、前記第
２レンズ群Ｇ２に含まれる前記負屈折力のレンズは、前
記第２レンズ群Ｇ２中の前記負屈折力のレンズのｄ線
（λ＝５８７．６ｎｍ）に対する屈折率をｎｄ、前記第
２レンズ群Ｇ２中の前記負屈折力のレンズの像側のレン
ズ面の曲率半径をｒ３、前記第２レンズ群Ｇ２の焦点距
離をｆＧ２とそれぞれしたとき、以下の条件を満足する
ことが望ましい。Further, in a preferred aspect of the present invention, the lens having the negative refracting power included in the second lens group G2 is d line (λ = 587) of the lens having the negative refracting power in the second lens group G2. .6 nm) is nd, the radius of curvature of the image-side lens surface of the lens having the negative refractive power in the second lens group G2 is r3, and the focal length of the second lens group G2 is fG2. It is desirable that the following conditions be satisfied.
【００１７】(３) ｎｄ＞１．７ (４) １．５＜ｆＧ２（ｎｄ−１)／ｒ３＜５(3) nd> 1.7 (4) 1.5 <fG2 (nd-1) / r3 <5
【００１８】条件式（３）、（４）は、第２レンズ群Ｇ
２に含まれる負屈折力のレンズに関する条件を規定して
いる。条件式（３）の下限を下回ると、ペッツバール和
の補正が困難になる。The conditional expressions (3) and (4) are defined by the second lens group G
The conditions concerning the lens of negative refractive power included in 2 are defined. If the lower limit of conditional expression (3) is exceeded, it will be difficult to correct the Petzval sum.
【００１９】また、条件式（４）は、前記負屈折力のレ
ンズの像側の面の屈折力を第２レンズ群の屈折力で規格
化したものである。条件式（４）の下限を下回ると、ペ
ッツバール和の補正が困難になる。また、第２レンズ群
Ｇ２の屈折力が過大であるため、諸収差の補正が困難と
なる上、射出瞳が近くなりがちで、無限遠系を推奨する
ＣＣＤカメラに搭載できなくなってしまう。逆に、条件
式（４）の上限を上回ると、第２レンズ群Ｇ２の焦点距
離が長く、諸収差の補正には有利であるが、第２レンズ
群Ｇ２と第３レンズ群Ｇ３の間隔が離れてしまうため、
全系の大型化を招いてしまう。In the conditional expression (4), the refractive power of the image-side surface of the lens having the negative refractive power is standardized by the refractive power of the second lens group. If the lower limit of conditional expression (4) is exceeded, it becomes difficult to correct Petzval sum. Further, since the refracting power of the second lens group G2 is too large, it becomes difficult to correct various aberrations, the exit pupil tends to be close, and the CCD camera that recommends the infinity system cannot be mounted. On the other hand, if the upper limit of conditional expression (4) is exceeded, the focal length of the second lens group G2 is long, which is advantageous for correction of various aberrations, but the distance between the second lens group G2 and the third lens group G3 is small. Because they will be separated
This leads to an increase in the size of the entire system.
【００２０】なお、本発明にかかるズームレンズは、前
記正の第２レンズ群の像側にさらに正の第３レンズ群を
有する構成が望ましい。正の第３レンズ群は、全系の射
出瞳をコントロールする作用を持ち、固体撮像素子に対
して効率よく光を導くことができる。また、第３レンズ
群は縮小光学系の働きもするため、全系の収差を良好に
補正するために有効である。It is desirable that the zoom lens according to the present invention further has a positive third lens group on the image side of the positive second lens group. The positive third lens group has a function of controlling the exit pupil of the entire system, and can efficiently guide light to the solid-state image sensor. Further, the third lens group also functions as a reduction optical system, which is effective in favorably correcting aberrations of the entire system.
【００２１】以下、添付図面に基づいて本発明の数値実
施例について説明する。各実施例とも、広角端状態から
望遠端状態へのズーミングに際して、負屈折力の第１レ
ンズ群Ｇ１は、第２レンズ群Ｇ２に対して非線形に移動
する。これにより、焦点距離を変化させる際に像面位置
を一定に保つ作用を担っている。また、最も物体側に正
の屈折力を有するレンズＬ１を配置することにより、物
体側から第１レンズ群Ｇ１に入射する光軸の幅を広げす
ぎない働きを持つとともに、広角端状態で発生する、負
の歪曲収差を補正することができる。Numerical embodiments of the present invention will be described below with reference to the accompanying drawings. In each of the examples, the first lens group G1 having negative refractive power moves non-linearly with respect to the second lens group G2 during zooming from the wide-angle end state to the telephoto end state. This serves to keep the image plane position constant when changing the focal length. Further, by disposing the lens L1 having a positive refracting power on the most object side, it has a function of not excessively widening the optical axis incident on the first lens group G1 from the object side, and is generated in the wide-angle end state. , Negative distortion can be corrected.
【００２２】正の屈折力の第２レンズ群Ｇ２は、物体側
から像側に移動することによって全系の焦点距離を変化
させる役割を担う。正屈折力の第３レンズ群Ｇ３は、ズ
ーミングには関与せず、射出瞳位置を適正に保つ作用を
担っている。The second lens group G2 having a positive refractive power plays a role of changing the focal length of the entire system by moving from the object side to the image side. The third lens group G3 having a positive refractive power does not participate in zooming and has a function of appropriately maintaining the exit pupil position.
【００２３】（第１実施例）図１は、第１実施例にかか
るズームレンズのレンズ構成を示す図である。物体側か
ら順に、負の屈折力を有する第１レンズ群Ｇ１と、正の
屈折力を有する第２レンズ群Ｇ２と、正の屈折力を有す
る第３レンズ群Ｇ３とから構成される。第１レンズ群Ｇ
１は、物体側から順に、両凸形状の正レンズと、物体側
に凸面を向けた負メニスカスレンズと、両凹形状の負レ
ンズと、物体側に凸面を向けた正メニスカスレンズとの
４枚のレンズから成る。(First Example) FIG. 1 is a diagram showing a lens configuration of a zoom lens according to the first example. The first lens group G1 having a negative refractive power, the second lens group G2 having a positive refractive power, and the third lens group G3 having a positive refractive power are arranged in this order from the object side. First lens group G
1 is, in order from the object side, a biconvex positive lens, a negative meniscus lens having a convex surface facing the object side, a biconcave negative lens, and a positive meniscus lens having a convex surface facing the object side. Composed of a lens.
【００２４】第２レンズ群Ｇ２は、物体側から順に、物
体側に非球面を有する両凸形状の正レンズと、物体側に
凸面を向けた正メニスカスレンズと像側に凹面を向けた
負メニスカスレンズとの接合負レンズと、両凸形状の正
レンズとの４枚のレンズから成る。第３レンズ群Ｇ３
は、両凸形状の正レンズ１枚から成る。また、開口絞り
Ｓは第２レンズ群Ｇ２の物体側に配置され、第２レンズ
群Ｇ２と一体に動く。また、本実施例及び以下に示す全
実施例は、第３レンズ群Ｇ３と像面Ｉとの間に、像面に
配設されたＣＣＤ等の個体撮像素子の限界解像以上の空
間周波数をカットするためのローパスフィルタＰ１と、
撮像素子を保護するカバー硝子Ｐ２とを有する。The second lens group G2 includes, in order from the object side, a biconvex positive lens having an aspherical surface on the object side, a positive meniscus lens having a convex surface on the object side, and a negative meniscus having a concave surface on the image side. It consists of four lenses, a cemented negative lens and a biconvex positive lens. Third lens group G3
Consists of one biconvex positive lens. The aperture stop S is arranged on the object side of the second lens group G2 and moves integrally with the second lens group G2. In addition, in this embodiment and all of the following embodiments, a spatial frequency higher than the limit resolution of the solid-state image sensor such as CCD arranged on the image plane is provided between the third lens group G3 and the image plane I. A low-pass filter P1 for cutting,
And a cover glass P2 that protects the image sensor.
【００２５】以下の表１に本実施例の諸元値を掲げる。
（全体諸元）中のｆは焦点距離、Ｂｆはバックフォーカ
ス、ＦNOはＦナンバー、2ωは画角をそれぞれ表す。な
お、像高Ｙは４．７である。また、（レンズデータ）
の、第１カラムは物体側からのレンズ面の番号、第２カ
ラムｒはレンズ面の曲率半径、第３カラムｄはレンズ面
間隔、第４カラムνは媒質のアッベ数、第５カラムｎは
媒質のｄ線（λ=587.6nm）に対する屈折率をそれぞれ表
す。また、ｒ＝０は平面を示す。（非球面データ）に
は、以下の式で非球面を表現した場合の非球面係数を示
す。Table 1 below lists the specifications of this embodiment.
In the (overall specifications), f is the focal length, Bf is the back focus, FNO is the F number, and 2ω is the angle of view. The image height Y is 4.7. Also (lens data)
, The first column is the number of the lens surface from the object side, the second column r is the radius of curvature of the lens surface, the third column d is the lens surface spacing, the fourth column ν is the Abbe number of the medium, and the fifth column n is The refractive index for the d-line (λ = 587.6 nm) of the medium is shown. Further, r = 0 indicates a plane. (Aspherical surface data) shows an aspherical surface coefficient when the aspherical surface is expressed by the following equation.
【００２６】Ｘ（ｙ）＝ｙ2／［ｒ・｛１＋（１−Ｋ・
ｙ2／ｒ2）1/2｝］＋Ｃ４・ｙ4＋Ｃ６・ｙ6＋Ｃ８・ｙ8
＋Ｃ１０・ｙ10 X (y) = y 2 / [r · {1+ (1-K ·
y 2 / r 2 ) 1/2 }] + C4 · y 4 + C6 · y 6 + C8 · y 8
+ C10 · y 10
【００２７】但し、Ｘ（ｙ）は非球面の頂点における接
平面から高さｙにおける非球面上の位置までの光軸方向
に沿った距離、ｒは近軸の曲率半径、Ｋは円錐定数、Ｃ
iは第ｉ次の非球面係数である。また、「Ｅ−ｎ」
（ｎ：整数）は、「×１０-n」を示す。さらに、（可変
間隔データ）には、広角端状態、中間焦点距離状態、望
遠端状態の各状態での焦点距離、可変間隔の値を示す。
ここで、諸元表の焦点距離、曲率半径、面間隔その他の
長さの単位は一般に「ｍｍ」が使われるが、光学系は比
例拡大又は比例縮小しても同等の光学性能が得られるの
で、これに限られるものではない。なお、全実施例の諸
元値において、上述の非球面式、符号と同一のものを用
いる。Here, X (y) is the distance along the optical axis from the tangent plane at the apex of the aspherical surface to the position on the aspherical surface at the height y, r is the paraxial radius of curvature, and K is the conic constant. C
i is the i-th aspherical coefficient. Also, "E-n"
(N: integer) indicates “× 10 −n ”. Further, (variable distance data) shows the focal length and the value of the variable distance in each of the wide-angle end state, the intermediate focal length state, and the telephoto end state.
Here, “mm” is generally used as the unit of the focal length, the radius of curvature, the surface distance and other lengths in the specification table, but since the optical system can obtain the same optical performance even if it is proportionally enlarged or proportionally reduced. , But is not limited to this. The same aspherical expressions and symbols as those described above are used in the specification values of all the examples.
【００２８】[0028]
【表１】 （全体諸元） ｆ＝ 8.24〜13.86〜23.3 Ｂｆ＝ 0.99 ＦNO＝ 2.88〜 3.72〜 5.19 2ω＝61.57〜37.96〜23° （レンズデータ） ｒ ｄ ν ｎ 1 115.9747 2 60.21 1.64 2 -68.982 0.1 1 3 100.0798 1 42.97 1.835 4 8.8788 3.2 1 5 -99.6193 1 64.2 1.5168 6 26.1734 0.6 1 7 14.2994 2 23.78 1.84666 8 36.0022 18.6699 1 9 0 0.7 1 開口絞り 10 15.6122 1.8 57.44 1.60602 非球面 11 -31.6056 0.1 1 12 6.5431 3 55.52 1.6779 13 13.371 0.9 23.78 1.84666 14 4.7498 1.1 1 15 579.5187 1.3 60.21 1.64 16 -38.5526 6.8159 1 17 24.722 2.6 70.45 1.48749 18 -22.2994 1.6874 1 19 0 2.76 64.2 1.5168 20 0 0.5 1 21 0 0.5 64.1 1.5168 22 0 0.99 1 （非球面データ） （１０面） Ｋ＝ 1.6443 Ｃ４＝ -1.04298E-4 Ｃ６＝ 3.26656E-7 Ｃ８＝ -6.34410E-8 Ｃ１０＝ 1.02560E-9 （可変間隔データ） 広角端状態 中間焦点距離状態 望遠端状態 f 8.24000 13.86000 23.30000 d8 18.66993 8.47628 2.42097 d16 6.81587 12.83904 22.95625[Table 1] (Overall specifications) f = 8.24 ~ 13.86 ~ 23.3 Bf = 0.99 FNO = 2.88 ~ 3.72 ~ 5.19 2ω = 61.57〜37.96〜23 ° (Lens data) rd ν n 1 115.9747 2 60.21 1.64 2 -68.982 0.1 1 3 100.0798 1 42.97 1.835 4 8.8788 3.2 1 5 -99.6193 1 64.2 1.5168 6 26.1734 0.6 1 7 14.2994 2 23.78 1.84666 8 36.0022 18.6699 1 9 0 0.7 1 Aperture stop 10 15.6 122 1.8 57.44 1.60602 Aspheric surface 11 -31.6056 0.1 1 12 6.5431 3 55.52 1.6779 13 13.371 0.9 23.78 1.84666 14 4.7498 1.1 1 15 579.5187 1.3 60.21 1.64 16 -38.5526 6.8159 1 17 24.722 2.6 70.45 1.48749 18 -22.2994 1.6874 1 19 0 2.76 64.2 1.5168 20 0 0.5 1 21 0 0.5 64.1 1.5168 22 0 0.99 1 (Aspherical data) (10 sides) K = 1.6443 C4 = -1.04298E-4 C6 = 3.26656E-7 C8 = -6.34410E-8 C10 = 1.02560E-9 (Variable interval data) Wide-angle end state Intermediate focal length state Telephoto end state f 8.24000 13.86000 23.30000 d8 18.66993 8.47628 2.42097 d16 6.81587 12.83904 22.95625
【００２９】図２，図３，図４はそれぞれ、第１実施例
にかかるズームレンズの広角端状態、中間焦点距離状
態、望遠端状態における諸収差図を示している。各収差
図において、ＦＮＯはＦナンバー、ＣはＣ線（λ＝６５
６．３ｎｍ）,ｄはｄ線（λ＝５８７．６ｎｍ）,ＦはＦ
線（λ＝４８６．１ｎｍ）,ｇはｇ線（λ＝４３５．８
ｎｍ）の収差曲線をそれぞれ表している。また、非点収
差図において、実線はサジタル像面、破線はメリジオナ
ル像面をそれぞれ示している。なお、以下の全実施例の
収差図において、本実施例と同様の符号を用いる。各収
差図から、本実施例において広角端状態から望遠端状態
にわたって諸収差、特に歪曲収差が良好に補正され、優
れた結像性能を有していることがわかる。FIGS. 2, 3 and 4 show various aberration diagrams of the zoom lens according to Example 1 in the wide-angle end state, the intermediate focal length state and the telephoto end state, respectively. In each aberration diagram, FNO is an F number, C is a C line (λ = 65
6.3 nm), d is d-line (λ = 587.6 nm), F is F
Line (λ = 486.1 nm), g is g line (λ = 435.8)
nm) aberration curves. In the astigmatism diagram, the solid line shows the sagittal image plane and the broken line shows the meridional image plane. In the aberration diagrams of all the examples below, the same reference numerals as those in this example are used. From each aberration diagram, it can be seen that various aberrations, particularly distortion aberration, are satisfactorily corrected and excellent imaging performance is obtained from the wide-angle end state to the telephoto end state in the present embodiment.
【００３０】（第２実施例）図５は、第２実施例にかか
るズームレンズのレンズ構成を示す図である。物体側か
ら順に、負の屈折力を有する第１レンズ群Ｇ１と、正の
屈折力を有する第２レンズ群Ｇ２と、正の屈折力を有す
る第３レンズ群Ｇ３とから構成される。(Second Embodiment) FIG. 5 is a view showing the lens arrangement of a zoom lens according to the second embodiment. The first lens group G1 having a negative refractive power, the second lens group G2 having a positive refractive power, and the third lens group G3 having a positive refractive power are arranged in this order from the object side.
【００３１】第１レンズ群Ｇ１は、物体側から順に、物
体側が平面の平凸形状の正レンズと、物体側に凸面を向
けた負メニスカスレンズと、両凹形状の負レンズと、物
体側に凸面を向けた正メニスカスレンズの４枚から成
る。第２レンズ群Ｇ２は、物体側から順に、両凸形状の
正レンズと、物体側に凸面を向けた正メニスカスレンズ
と像側に凹面を向けた負メニスカスレンズとの接合負レ
ンズと、物体側に非球面を有し像側に凹面を向けた正メ
ニスカスレンズとの４枚から成る。第３レンズ群Ｇ３
は、両凸形状の正レンズ１枚から成る。開口絞りＳは第
２レンズ群Ｇ２の物体側に配置され、第２レンズ群Ｇ２
と一体に動く。表２に本実施例の諸元値を掲げる。The first lens group G1 includes, in order from the object side, a plano-convex positive lens having a flat object side, a negative meniscus lens having a convex surface facing the object side, a biconcave negative lens, and an object side lens. It consists of four positive meniscus lenses with their convex surfaces facing. The second lens group G2 includes, in order from the object side, a biconvex positive lens, a cemented negative lens of a positive meniscus lens having a convex surface facing the object side and a negative meniscus lens having a concave surface facing the image side, and an object side. And a positive meniscus lens having an aspherical surface on the concave side facing the image side. Third lens group G3
Consists of one biconvex positive lens. The aperture stop S is disposed on the object side of the second lens group G2, and the second lens group G2
Moves together with. Table 2 lists the specifications of this embodiment.
【００３２】[0032]
【表２】 （全体諸元） ｆ＝ 8.24〜13.8 〜23.4 Ｂｆ＝ 1.41 ＦNO＝ 2.9 〜 3.77〜 5.36 2ω＝61.6 〜38.3 〜23.2° （レンズデータ） ｒ ｄ ν ｎ 1 0 2.2 70.24 1.48749 2 -40.5128 0.1 1 3 539.1365 1 42.72 1.83481 4 9.785 2.7 1 5 -125.574 1 60.09 1.64 6 36.0955 1 1 7 16.2323 2.1 23.78 1.84666 8 51.1411 18.9727 1 9 0 0.7 1 開口絞り 10 13.242 1.8 44.2 1.7859 11 231.6479 0.1 1 12 6.0744 2.7 53.22 1.6935 13 19.0798 0.9 23.78 1.84666 14 4.5282 1 1 15 19.571 1.4 57.44 1.60602 非球面 16 38.9314 7.0417 1 17 40 2.6 60.09 1.64 18 -19.7275 1 1 19 0 2.76 67.85 1.458504 20 0 0.5 1 21 0 0.5 64.1 1.5168 22 0 1.411 1 （非球面データ） （１５面） Ｋ＝ 1.0000 Ｃ４＝ -4.93610E-4 Ｃ６＝ -6.65630E-6 Ｃ８＝ -9.95720E-7 Ｃ１０＝ 1.00000E-16 （可変間隔データ） 広角端状態 中間焦点距離状態 望遠端状態 f 8.24000 13.80000 23.40000 d8 18.97267 8.69001 2.43809 d16 7.04166 12.99033 23.26143[Table 2] (Overall specifications) f = 8.24 ~ 13.8 ~ 23.4 Bf = 1.41 FNO = 2.9 ~ 3.77 ~ 5.36 2ω = 61.6 ~ 38.3 ~ 23.2 ° (Lens data) rd ν n 1 0 2.2 70.24 1.48749 2 -40.5 128 0.1 1 3 539.1365 1 42.72 1.83481 4 9.785 2.7 1 5 -125.574 1 60.09 1.64 6 36.0955 1 1 7 16.2323 2.1 23.78 1.84666 8 51.1411 18.9727 1 9 0 0.7 1 Aperture stop 10 13.242 1.8 44.2 1.7859 11 231.6479 0.1 1 12 6.0744 2.7 53.22 1.6935 13 19.0798 0.9 23.78 1.84666 14 4.5282 1 1 15 19.571 1.4 57.44 1.60602 Aspheric surface 16 38.9314 7.0417 1 17 40 2.6 60.09 1.64 18 -19.7275 1 1 19 0 2.76 67.85 1.458504 20 0 0.5 1 21 0 0.5 64.1 1.5168 22 0 1.411 1 (Aspherical data) (15 sides) K = 1.0000 C4 = -4.93610E-4 C6 = -6.65630E-6 C8 = -9.95720E-7 C10 = 1.00000E-16 (Variable interval data) Wide-angle end state Intermediate focal length state Telephoto end state f 8.24000 13.80000 23.40000 d8 18.97267 8.69001 2.43809 d16 7.04166 12.99033 23.26143
【００３３】図６（ａ）,（ｂ）,（ｃ）は、それぞれ第
２実施例にかかるズームレンズの広角端状態、中間焦点
距離状態、望遠端状態における諸収差図を示している。
各収差図から、本実施例において広角端状態から望遠端
状態にわたって諸収差、特に歪曲収差が良好に補正さ
れ、優れた結像性能を有していることがわかる。FIGS. 6A, 6B, and 6C are graphs showing various aberrations of the zoom lens according to the second embodiment in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively.
From each aberration diagram, it can be seen that various aberrations, particularly distortion aberration, are satisfactorily corrected and excellent imaging performance is obtained from the wide-angle end state to the telephoto end state in the present embodiment.
【００３４】（第３実施例）図７は、第３実施例にかか
るズームレンズのレンズ構成を示す図である。物体側か
ら順に、負の屈折力を有する第１レンズ群Ｇ１と、正の
屈折力を有する第２レンズ群Ｇ２と、正の屈折力を有す
る第３レンズ群Ｇ３とから構成される。(Third Embodiment) FIG. 7 is a diagram showing the lens arrangement of a zoom lens according to the third embodiment. The first lens group G1 having a negative refractive power, the second lens group G2 having a positive refractive power, and the third lens group G3 having a positive refractive power are arranged in this order from the object side.
【００３５】第１レンズ群Ｇ１は、物体側から順に、両
凸形状の正レンズと、物体側に凸面を向けた負メニスカ
スレンズと、両凹形状の負レンズと、物体側に凸面を向
けた正メニスカスレンズとの４枚のレンズから成る。第
２レンズ群Ｇ２は、物体側から順に、物体側に非球面を
有する両凸形状の正レンズと、物体側に凸面を向けた正
メニスカスレンズと像側に凹面を向けた負メニスカスレ
ンズとの接合負レンズと、両凸形状の正レンズとの４枚
のレンズから成る。第３レンズ群Ｇ３は、両凸形状の正
レンズ１枚から成る。また、開口絞りＳは第２レンズ群
Ｇ２の物体側に配置され、第２レンズ群Ｇ２と一体に動
く。表３に本実施例の諸元値を掲げる。The first lens group G1 has, in order from the object side, a biconvex positive lens, a negative meniscus lens having a convex surface directed toward the object side, a biconcave negative lens, and a convex surface directed toward the object side. It consists of four lenses, a positive meniscus lens. The second lens group G2 includes, in order from the object side, a biconvex positive lens having an aspherical surface on the object side, a positive meniscus lens having a convex surface on the object side, and a negative meniscus lens having a concave surface on the image side. It consists of four lenses, a cemented negative lens and a biconvex positive lens. The third lens group G3 is composed of one biconvex positive lens. The aperture stop S is arranged on the object side of the second lens group G2 and moves integrally with the second lens group G2. Table 3 lists the specifications of this embodiment.
【００３６】[0036]
【表３】 （全体諸元） ｆ＝ 8.24〜13.86〜23.3 Ｂｆ＝ 1.47 ＦNO＝ 2.91〜 3.78〜 5.31 2ω＝61.73〜38.01〜23.03° （レンズデータ） ｒ ｄ ν ｎ 1 135.9391 2 60.09 1.64 2 -76.6259 0.1 1 3 70.5561 1 42.72 1.83481 4 8.8045 3.2 1 5 -46.9 1 61.18 1.58913 6 38.5355 0.6 1 7 15.6452 2.1 23.78 1.84666 8 50.7656 18.7842 1 9 0 0.7 1 開口絞り 10 15.4387 1.8 57.44 1.60602 非球面 11 -33.2945 0.1 1 12 6.5675 3 54.84 1.691 13 13.504 0.9 23.78 1.84666 14 4.7184 1.3 1 15 101.7599 1.4 61.18 1.58913 16 -49.0325 6.4981 1 17 24.856 3 70.24 1.48749 18 -22.0813 1 1 19 0 2.76 67.85 1.458504 20 0 0.5 1 21 0 0.5 64.1 1.5168 22 0 1.4714 1 （非球面データ） （１０面） Ｋ＝ -0.0063 Ｃ４＝ -3.94150E-5 Ｃ６＝ -3.26220E-6 Ｃ８＝ 4.43290E-7 Ｃ１０＝ -1.87880E-8 （可変間隔データ） 広角端状態 中間焦点距離状態 望遠端状態 f 8.24000 13.86000 23.30000 d8 18.78424 8.50822 2.40397 d16 6.49812 12.55348 22.72475[Table 3] (Overall specifications) f = 8.24 ~ 13.86 ~ 23.3 Bf = 1.47 FNO = 2.91 ~ 3.78 ~ 5.31 2ω = 61.73〜38.01〜23.03 ° (Lens data) rd ν n 1 135.9391 2 60.09 1.64 2 -76.6259 0.1 1 3 70.5561 1 42.72 1.83481 4 8.8045 3.2 1 5 -46.9 1 61.18 1.58913 6 38.5355 0.6 1 7 15.6452 2.1 23.78 1.84666 8 50.7656 18.7842 1 9 0 0.7 1 Aperture stop 10 15.4387 1.8 57.44 1.60602 Aspheric surface 11 -33.2945 0.1 1 12 6.5675 3 54.84 1.691 13 13.504 0.9 23.78 1.84666 14 4.7184 1.3 1 15 101.7599 1.4 61.18 1.58913 16 -49.0325 6.4981 1 17 24.856 3 70.24 1.48749 18 -22.08 13 1 1 19 0 2.76 67.85 1.458504 20 0 0.5 1 21 0 0.5 64.1 1.5168 22 0 1.4714 1 (Aspherical data) (10 sides) K = -0.0063 C4 = -3.94150E-5 C6 = -3.26220E-6 C8 = 4.43290E-7 C10 = -1.87880E-8 (Variable interval data) Wide-angle end state Intermediate focal length state Telephoto end state f 8.24000 13.86000 23.30000 d8 18.78424 8.50822 2.40397 d16 6.49812 12.55348 22.72475
【００３７】図８（ａ）,（ｂ）,（ｃ）は、それぞれ第
３実施例にかかるズームレンズの広角端状態、中間焦点
距離状態、望遠端状態における諸収差図を示している。
各収差図から、本実施例において広角端状態から望遠端
状態にわたって諸収差、特に歪曲収差が良好に補正さ
れ、優れた結像性能を有していることがわかる。FIGS. 8A, 8B, and 8C are aberration diagrams of the zoom lens according to the third example in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively.
From each aberration diagram, it can be seen that various aberrations, particularly distortion aberration, are satisfactorily corrected and excellent imaging performance is obtained from the wide-angle end state to the telephoto end state in the present embodiment.
【００３８】（第４実施例）図９は、第４実施例にかか
るズームレンズのレンズ構成を示す図である。物体側か
ら順に、負の屈折力を有する第１レンズ群Ｇ１と、正の
屈折力を有する第２レンズ群Ｇ２と、正の屈折力を有す
る第３レンズ群Ｇ３とから構成される。(Fourth Embodiment) FIG. 9 is a view showing the lens arrangement of a zoom lens according to the fourth embodiment. The first lens group G1 having a negative refractive power, the second lens group G2 having a positive refractive power, and the third lens group G3 having a positive refractive power are arranged in this order from the object side.
【００３９】第１レンズ群Ｇ１は、物体側から順に、物
体側に非球面を有し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
接合負レンズと、両凹形状の負レンズと両凸形状の正レ
ンズとの接合正レンズの４枚から成る。第２レンズ群Ｇ
２は、物体側から順に、両凸形状の正レンズと、両凸形
状の正レンズと両凹形状の負レンズとの接合負レンズ
と、両凸形状の正レンズとの４枚から成る。第３レンズ
群Ｇ３は、両凸形状の正レンズ１枚から成る。開口絞り
Ｓは第２レンズ群Ｇ２の物体側に配置され、第２レンズ
群Ｇ２と一体に動く。表４に本実施例の諸元値を掲げ
る。The first lens group G1 is, in order from the object side, a cemented negative lens composed of a positive meniscus lens having an aspherical surface on the object side and having a convex surface facing the object side, and a negative meniscus lens having a convex surface facing the object side. , A double-concave negative lens and a double-convex positive lens, which are cemented positive lenses. Second lens group G
Reference numeral 2 denotes, in order from the object side, a biconvex positive lens, a negative lens cemented with a biconvex positive lens and a biconcave negative lens, and a biconvex positive lens. The third lens group G3 is composed of one biconvex positive lens. The aperture stop S is arranged on the object side of the second lens group G2 and moves integrally with the second lens group G2. Table 4 lists the specifications of this example.
【００４０】[0040]
【表４】 （全体諸元） ｆ＝ 8.24〜13.8 〜23.4 Ｂｆ＝ 0.57 ＦNO＝ 2.9 〜 3.77〜 5.27 2ω＝62.29〜37.91〜22.51° （レンズデータ） ｒ ｄ ν ｎ 1 500 1.8 56.82 1.60738 非球面 2 3174.371 1 23.78 1.84666 3 9.2418 2.8 1 4 -60.583 1 70.24 1.48749 5 11.5 3 23.78 1.84666 6 -154.269 19.6174 1 7 0 0.7 1 開口絞り 8 20.1843 1.8 49.32 1.7432 9 -34.6771 0.1 1 10 7.355 4.5 43.73 1.60562 11 -18.9962 0.9 23.78 1.84666 12 5.7429 0.8 1 13 107.5153 1.6 37.17 1.834 14 -49.7431 7.3128 1 15 12.8057 2.8 61.18 1.58913 16 -335.457 1 1 17 0 2.76 67.85 1.458504 18 0 0.5 1 19 0 0.5 64.1 1.5168 20 0 0.5691 1 （非球面データ） （１面） Ｋ＝ 1.0000 Ｃ４＝ 8.16380E-5 Ｃ６＝ -1.11550E-6 Ｃ８＝ 1.80080E-8 Ｃ１０＝ -1.05940E-10 （可変間隔データ） 広角端状態 中間焦点距離状態 望遠端状態 f 8.24000 13.80000 23.40000 d6 19.61739 8.98837 2.52587 d14 7.31276 13.53719 24.28440[Table 4] (Overall specifications) f = 8.24 ~ 13.8 ~ 23.4 Bf = 0.57 FNO = 2.9 ~ 3.77 ~ 5.27 2ω = 62.29〜37.91〜22.51 ° (Lens data) rd ν n 1 500 1.8 56.82 1.60738 Aspheric 2 3174.371 1 23.78 1.84666 3 9.2418 2.8 1 4 -60.583 1 70.24 1.48749 5 11.5 3 23.78 1.84666 6 -154.269 19.6174 1 7 0 0.7 1 Aperture stop 8 20.1843 1.8 49.32 1.7432 9 -34.6771 0.1 1 10 7.355 4.5 43.73 1.60562 11 -18.9962 0.9 23.78 1.84666 12 5.7429 0.8 1 13 107.5153 1.6 37.17 1.834 14 -49.7431 7.3128 1 15 12.8057 2.8 61.18 1.58913 16 -335.457 1 1 17 0 2.76 67.85 1.458504 18 0 0.5 1 19 0 0.5 64.1 1.5168 20 0 0.5691 1 (Aspherical data) (One side) K = 1.0000 C4 = 8.16380E-5 C6 = -1.11550E-6 C8 = 1.80080E-8 C10 = -1.05940E-10 (Variable interval data) Wide-angle end state Intermediate focal length state Telephoto end state f 8.24000 13.80000 23.40000 d6 19.61739 8.98837 2.52587 d14 7.31276 13.53719 24.28440
【００４１】図１０,図１１,図１２は、それぞれ第４実
施例にかかるズームレンズの広角端状態、中間焦点距離
状態、望遠端状態における諸収差図を示している。各収
差図から、本実施例において広角端状態から望遠端状態
にわたって諸収差、特に歪曲収差が良好に補正され、優
れた結像性能を有していることがわかる。FIG. 10, FIG. 11 and FIG. 12 are graphs showing various aberrations of the zoom lens according to the fourth embodiment in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively. From each aberration diagram, it can be seen that various aberrations, particularly distortion aberration, are satisfactorily corrected and excellent imaging performance is obtained from the wide-angle end state to the telephoto end state in the present embodiment.
【００４２】（第５実施例）図１３は、第５実施例にか
かるズームレンズのレンズ構成を示す図である。物体側
から順に、負の屈折力を有する第１レンズ群Ｇ１と、正
の屈折力を有する第２レンズ群Ｇ２と、正の屈折力を有
する第３レンズ群Ｇ３とから構成される。(Fifth Embodiment) FIG. 13 is a view showing the lens arrangement of a zoom lens according to the fifth embodiment. The first lens group G1 having a negative refractive power, the second lens group G2 having a positive refractive power, and the third lens group G3 having a positive refractive power are arranged in this order from the object side.
【００４３】第１レンズ群Ｇ１は、物体側から順に、物
体側が平面の平凸形状の正レンズと、物体側に凸面を向
けた負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、物体側に凸面を向けた正メニスカス
レンズとの４枚から成る。第２レンズ群Ｇ２は、物体側
から順に、両凸形状の正レンズと、物体側に凸面を向け
た正メニスカスレンズと像側に凹面を向けた負メニスカ
スレンズとの接合負レンズと、物体側に非球面を有し像
側に凹面を向けた正メニスカスレンズとの４枚から成
る。第３レンズ群Ｇ３は、両凸形状の正レンズ１枚から
成る。開口絞りＳは第２レンズ群Ｇ２の物体側に配置さ
れ、第２レンズ群Ｇ２と一体に動く。表５に本実施例の
諸元値を掲げる。The first lens group G1 includes, in order from the object side, a plano-convex positive lens having a flat object side, a negative meniscus lens having a convex surface facing the object side, and a negative meniscus lens having a convex surface facing the object side. , And a positive meniscus lens having a convex surface facing the object side. The second lens group G2 includes, in order from the object side, a biconvex positive lens, a cemented negative lens of a positive meniscus lens having a convex surface facing the object side and a negative meniscus lens having a concave surface facing the image side, and an object side. And a positive meniscus lens having an aspherical surface on the concave side facing the image side. The third lens group G3 is composed of one biconvex positive lens. The aperture stop S is arranged on the object side of the second lens group G2 and moves integrally with the second lens group G2. Table 5 lists the specifications of this embodiment.
【００４４】[0044]
【表５】 （全体諸元） ｆ＝ 8.24〜13.8 〜23.4 Ｂｆ＝ 1.41 ＦNO＝ 2.88〜 3.76〜 5.33 2ω＝61.55〜38.28〜23.18° （レンズデータ） ｒ ｄ ν ｎ 1 0 2.2 70.24 1.48749 2 -39.5478 0.1 1 3 935.6862 1 42.72 1.83481 4 9.7689 2.7 1 5 152.2699 1 60.09 1.64 6 23.8592 1 1 7 14.6448 2.1 23.78 1.84666 8 39.079 18.9261 1 9 0 0.7 1 開口絞り 10 13.7502 1.8 44.2 1.7859 11 215.0156 0.1 1 12 6.0308 2.7 53.22 1.6935 13 19.0615 0.9 23.78 1.84666 14 4.5771 1 1 15 19.4093 1.4 57.44 1.60602 非球面 16 44.4594 7.1497 1 17 40 2.6 60.09 1.64 18 -19.7275 1 1 19 0 2.76 67.85 1.458504 20 0 0.5 1 21 0 0.5 64.1 1.5168 22 0 1.411 1 （非球面データ） （１５面） Ｋ＝ 1.0000 Ｃ４＝ -5.05430E-4 Ｃ６＝ -7.88060E-6 Ｃ８＝ -8.22530E-8 Ｃ１０＝ -1.09930E-7 （可変間隔データ） 広角端状態 中間焦点距離状態 望遠端状態 f 8.24000 13.80000 23.40000 d8 18.92611 8.64345 2.39153 d16 7.14967 13.09834 23.36944[Table 5] (Overall specifications) f = 8.24 ~ 13.8 ~ 23.4 Bf = 1.41 FNO = 2.88 ~ 3.76 ~ 5.33 2ω = 61.55〜38.28〜23.18 ° (Lens data) rd ν n 1 0 2.2 70.24 1.48749 2 -39.5478 0.1 1 3 935.6862 1 42.72 1.83481 4 9.7 689 2.7 1 5 152.2699 1 60.09 1.64 6 23.8592 1 1 7 14.6448 2.1 23.78 1.84666 8 39.079 18.9261 1 9 0 0.7 1 Aperture stop 10 13.7502 1.8 44.2 1.7859 11 215.0156 0.1 1 12 6.0308 2.7 53.22 1.6935 13 19.0615 0.9 23.78 1.84666 14 4.5771 1 1 15 19.4093 1.4 57.44 1.60602 Aspheric surface 16 44.4594 7.1497 1 17 40 2.6 60.09 1.64 18 -19.7275 1 1 19 0 2.76 67.85 1.458504 20 0 0.5 1 21 0 0.5 64.1 1.5168 22 0 1.411 1 (Aspherical data) (15 sides) K = 1.0000 C4 = -5.05430E-4 C6 = -7.88060E-6 C8 = -8.22530E-8 C10 = -1.09930E-7 (Variable interval data) Wide-angle end state Intermediate focal length state Telephoto end state f 8.24000 13.80000 23.40000 d8 18.92611 8.64345 2.39153 d16 7.14967 13.09834 23.36944
【００４５】図１４（ａ）,（ｂ）,（ｃ）は、それぞれ
第５実施例にかかるズームレンズの広角端状態、中間焦
点距離状態、望遠端状態における諸収差図を示してい
る。各収差図から、本実施例において広角端状態から望
遠端状態にわたって諸収差、特に歪曲収差が良好に補正
され、優れた結像性能を有していることがわかる。FIGS. 14A, 14B, and 14C are aberration diagrams of the zoom lens according to the fifth example in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively. From each aberration diagram, it can be seen that various aberrations, particularly distortion aberration, are satisfactorily corrected and excellent imaging performance is obtained from the wide-angle end state to the telephoto end state in the present embodiment.
【００４６】（第６実施例）図１５は、第６実施例にか
かるズームレンズのレンズ構成を示す図である。物体側
から順に、負の屈折力を有する第１レンズ群Ｇ１と、正
の屈折力を有する第２レンズ群Ｇ２と、正の屈折力を有
する第３レンズ群Ｇ３とから構成される。(Sixth Embodiment) FIG. 15 shows the lens arrangement of a zoom lens according to the sixth embodiment. The first lens group G1 having a negative refractive power, the second lens group G2 having a positive refractive power, and the third lens group G3 having a positive refractive power are arranged in this order from the object side.
【００４７】第１レンズ群Ｇ１は、物体側から順に、両
凸形状の正レンズと、両凹形状の負レンズと、両凹形状
の負レンズと物体側に凸面を向けた正メニスカスレンズ
との接合正レンズとの４枚から成る。第２レンズ群Ｇ２
は、物体側から順に、物体側に凸面を向けた正メニスカ
スレンズと、両凸形状の正レンズと両凹形状の負レンズ
との接合負レンズと、物体側に非球面を有し像側に凹面
を向けた正メニスカスレンズとの４枚から成る。第３レ
ンズ群Ｇ３は、両凸形状の正レンズ１枚から構成され
る。開口絞りＳは第２レンズ群Ｇ２の物体側に配置さ
れ、第２レンズ群Ｇ２と一体に動く。表６に本実施例の
諸元値を掲げる。The first lens group G1 includes, in order from the object side, a biconvex positive lens, a biconcave negative lens, a biconcave negative lens, and a positive meniscus lens having a convex surface directed toward the object side. It consists of 4 lenses with a cemented positive lens. Second lens group G2
Is a positive meniscus lens with a convex surface facing the object side in order from the object side, a cemented negative lens of a biconvex positive lens and a biconcave negative lens, and an aspherical surface on the object side, Consists of 4 lenses with a positive meniscus lens with the concave surface facing. The third lens group G3 is composed of one biconvex positive lens. The aperture stop S is arranged on the object side of the second lens group G2 and moves integrally with the second lens group G2. Table 6 lists the specifications of this embodiment.
【００４８】[0048]
【表６】 （全体諸元） ｆ＝ 8.24〜15.82〜23.4 Ｂｆ＝ 0.88 ＦNO＝ 2.89〜 3.99〜 5.13 2ω＝62.04〜33.42〜22.9° （レンズデータ） ｒ ｄ ν ｎ 1 40 2.5 46.58 1.804 2 -82.1854 0.2 1 3 -128.875 1 26.3 1.7847 4 8.5 4.5 1 5 -40.8363 1 70.24 1.48749 6 10.5313 2.7 23.78 1.84666 7 60.4216 19.8312 1 8 0 0.7 1 開口絞り 9 10.5748 1.8 34.96 1.801 10 84.9544 0.1 1 11 6.3735 3 59.47 1.53996 12 -226.157 0.8 23.78 1.84666 13 5 0.8 1 14 13.721 1.4 57.44 1.60602 非球面 15 500 7.3037 1 16 193.9953 2.4 61.18 1.58913 17 -19.3563 1 1 18 0 2.76 67.85 1.458504 19 0 0.5 1 20 0 0.5 64.1 1.5168 21 0 0.8751 1 （非球面データ） （１４面） Ｋ＝-14.4251 Ｃ４＝ 4.48120E-4 Ｃ６＝ -3.70640E-5 Ｃ８＝ 1.83090E-6 Ｃ１０＝ -6.18790E-8 （可変間隔データ） 広角端状態 中間焦点距離状態 望遠端状態 f 8.24000 15.82000 23.39999 d7 19.83122 6.80588 2.21919 d15 7.30369 14.22340 21.14311[Table 6] (Overall specifications) f = 8.24 ~ 15.82 ~ 23.4 Bf = 0.88 FNO = 2.89 ~ 3.99 ~ 5.13 2ω = 62.04 ~ 33.42 ~ 22.9 ° (Lens data) rd ν n 1 40 2.5 46.58 1.804 2 -82.1854 0.2 1 3 -128.875 1 26.3 1.7847 4 8.5 4.5 1 5 -40.8363 1 70.24 1.48749 6 10.5313 2.7 23.78 1.84666 7 60.4216 19.8312 1 8 0 0.7 1 Aperture stop 9 10.5748 1.8 34.96 1.801 10 84.9544 0.1 1 11 6.3735 3 59.47 1.53996 12 -226.157 0.8 23.78 1.84666 13 5 0.8 1 14 13.721 1.4 57.44 1.60602 Aspheric surface 15 500 7.3037 1 16 193.9953 2.4 61.18 1.58913 17 -19.3 563 1 1 18 0 2.76 67.85 1.458504 19 0 0.5 1 20 0 0.5 64.1 1.5168 21 0 0.8751 1 (Aspherical data) (14 sides) K = -14.4251 C4 = 4.48120E-4 C6 = -3.70640E-5 C8 = 1.83090E-6 C10 = -6.18790E-8 (Variable interval data) Wide-angle end state Intermediate focal length state Telephoto end state f 8.24000 15.82000 23.39999 d7 19.83122 6.80588 2.21919 d15 7.30369 14.22340 21.14311
【００４９】図１６,図１７,図１８は、それぞれ第６実
施例にかかるズームレンズの広角端状態、中間焦点距離
状態、望遠端状態における諸収差図を示している。各収
差図から、本実施例において広角端状態から望遠端状態
にわたって諸収差、特に歪曲収差が良好に補正され、優
れた結像性能を有していることがわかる。FIG. 16, FIG. 17, and FIG. 18 show various aberration diagrams of the zoom lens according to the sixth example in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively. From each aberration diagram, it can be seen that various aberrations, particularly distortion aberration, are satisfactorily corrected and excellent imaging performance is obtained from the wide-angle end state to the telephoto end state in the present embodiment.
【００５０】（第７実施例）図１９は、第７実施例にか
かるズームレンズのレンズ構成を示す図である。物体側
から順に、負の屈折力を有する第１レンズ群Ｇ１と、正
の屈折力を有する第２レンズ群Ｇ２と、正の屈折力を有
する第３レンズ群Ｇ３とから構成される。(Seventh Embodiment) FIG. 19 is a view showing the lens arrangement of a zoom lens according to the seventh embodiment. The first lens group G1 having a negative refractive power, the second lens group G2 having a positive refractive power, and the third lens group G3 having a positive refractive power are arranged in this order from the object side.
【００５１】第１レンズ群Ｇ１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と、物体側に凸面
を向けた負メニスカスレンズと、両凹形状の負レンズと
物体側に凸面を向けた正メニスカスレンズとの接合正レ
ンズの４枚から成る。第２レンズ群Ｇ２は、物体側から
順に、物体側に凸面を向けた正メニスカスレンズと、両
凸形状の正レンズと両凹形状の負レンズとの接合負レン
ズと、物体側に非球面を有し像側に凹面を向けた正メニ
スカスレンズとの４枚から成る。第３レンズ群Ｇ３は、
両凸形状の正レンズ１枚から成る。開口絞りＳは第２レ
ンズ群Ｇ２の物体側に配置され、第２レンズ群Ｇ２と一
体に動く。表７に本実施例の諸元値を掲げる。The first lens group G1 includes, in order from the object side, a positive meniscus lens having a convex surface facing the image side, a negative meniscus lens having a convex surface facing the object side, a biconcave negative lens and a convex surface facing the object side. It is composed of four cemented positive lenses with a positive meniscus lens facing the lens. The second lens group G2 includes, in order from the object side, a positive meniscus lens having a convex surface directed toward the object side, a cemented negative lens of a biconvex positive lens and a biconcave negative lens, and an aspheric surface on the object side. It has four lenses, a positive meniscus lens having a concave surface facing the image side. The third lens group G3 includes
It consists of one biconvex positive lens. The aperture stop S is arranged on the object side of the second lens group G2 and moves integrally with the second lens group G2. Table 7 lists the specifications of this example.
【００５２】[0052]
【表７】 （全体諸元） ｆ＝ 8.24〜13.8 〜23.4 Ｂｆ＝ 1.32 ＦNO＝ 2.89〜 3.77〜 5.31 2ω＝64.39〜38.45〜23.02° （レンズデータ） ｒ ｄ ν ｎ 1 -128.997 2.4 60.09 1.64 2 -67.3301 0.1 1 3 618.8541 1 25.43 1.80518 4 10.1223 4 1 5 -187.356 1 70.24 1.48749 6 10.9914 2.9 23.78 1.84666 7 57.2877 18.067 1 8 0 0.7 1 開口絞り 9 10.32 1.9 46.63 1.816 10 256.4155 0.1 1 11 7.7996 3.5 40.75 1.58144 12 -23.744 0.9 23.78 1.84666 13 5.3246 0.7 1 14 11.326 1.4 59.38 1.58313 非球面 15 25.1649 5.6461 1 16 36.3243 3 61.18 1.58913 17 -20.6301 1 1 18 0 2.76 67.85 1.458504 19 0 0.5 1 20 0 0.5 64.1 1.5168 21 0 1.3203 1 （非球面データ） （１４面） Ｋ＝ -4.1247 Ｃ４＝ 1.00000E-10 Ｃ６＝ -1.65720E-5 Ｃ８＝ 1.41910E-7 Ｃ１０＝ 1.00000E-16 （可変間隔データ） 広角端状態 中間焦点距離状態 望遠端状態 f 8.24000 13.80000 23.40000 d7 18.06701 8.28561 2.33846 d15 5.64605 11.41448 21.37437[Table 7] (Overall specifications) f = 8.24 ~ 13.8 ~ 23.4 Bf = 1.32 FNO = 2.89 ~ 3.77 ~ 5.31 2ω = 64.39〜38.45〜23.02 ° (Lens data) rd ν n 1 -128.997 2.4 60.09 1.64 2 -67.3301 0.1 1 3 618.8541 1 25.43 1.80518 4 10.1223 4 1 5 -187.356 1 70.24 1.48749 6 10.9914 2.9 23.78 1.84666 7 57.2877 18.067 1 8 0 0.7 1 Aperture stop 9 10.32 1.9 46.63 1.816 10 256.4155 0.1 1 11 7.7996 3.5 40.75 1.58144 12 -23.744 0.9 23.78 1.84666 13 5.3 246 0.7 1 14 11.326 1.4 59.38 1.58313 Aspheric surface 15 25.1649 5.6461 1 16 36.3243 3 61.18 1.58913 17 -20.6301 1 1 18 0 2.76 67.85 1.458504 19 0 0.5 1 20 0 0.5 64.1 1.5168 21 0 1.3203 1 (Aspherical data) (14 sides) K = -4.1247 C4 = 1.00000E-10 C6 = -1.65720E-5 C8 = 1.41910E-7 C10 = 1.00000E-16 (Variable interval data) Wide-angle end state Intermediate focal length state Telephoto end state f 8.24000 13.80000 23.40000 d7 18.06701 8.28561 2.33846 d15 5.64605 11.41448 21.37437
【００５３】図２０,図２１,図２２は、それぞれ第７実
施例にかかるズームレンズの広角端状態、中間焦点距離
状態、望遠端状態における諸収差図を示している。各収
差図から、本実施例において広角端状態から望遠端状態
にわたって諸収差、特に歪曲収差が良好に補正され、優
れた結像性能を有していることがわかる。また、表８に
各実施例の条件式対応値を掲げる。20, 21, and 22 are aberration diagrams of the zoom lens according to the seventh example in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively. From each aberration diagram, it can be seen that various aberrations, particularly distortion aberration, are satisfactorily corrected and excellent imaging performance is obtained from the wide-angle end state to the telephoto end state in the present embodiment. Table 8 shows the values corresponding to the conditional expressions of each example.
【００５４】[0054]
【表８】 （１）ｆＬ１／｜ｆＧ１｜ （２）（ｒ２＋ｒ１）／（ｒ２−ｒ１） （３）ｎｄ （４）ｆＧ２（ｎｄ−１）／ｒ３ 実施例１ 実施例２ 実施例３ 実施例４ 実施例５ 実施例６ 実施例７ （１） 3.65 4.33 4.13 50.10 4.23 1.82 11.68 （２） -0.58 -0.55 -0.10 -0.68 -1.37 -0.59 -0.89 （３） 1.84666 1.84666 1.84666 1.84666 1.84666 1.84666 1.84666 （４） 2.66 2.80 2.69 2.30 2.77 2.42 2.29[Table 8] (1) fL1 / | fG1 | (2) (r2 + r1) / (r2-r1) (3) nd (4) fG2 (nd-1) / r3 Example 1 Example 2 Example 3 Example 4 Example 4 Example 5 Example 6 Example 7 (1) 3.65 4.33 4.13 50.10 4.23 1.82 11.68 (2) -0.58 -0.55 -0.10 -0.68 -1.37 -0.59 -0.89 (3) 1.84666 1.84666 1.84666 1.84666 1.84666 1.84666 1.84666 (4) 2.66 2.80 2.69 2.30 2.77 2.42 2.29
【００５５】なお、上記各実施例では、第１レンズ群Ｇ
１又は第３レンズ群Ｇ３の移動によってフォーカスが可
能である。、また、第１レンズＧ１から第３レンズＧ３
まで全てのレンズを移動させて行う全体繰出しでも良
い。In each of the above embodiments, the first lens group G
Focusing is possible by moving the first or third lens group G3. , The first lens G1 to the third lens G3
It is also possible to carry out the whole feeding by moving all the lenses up to.
【００５６】[0056]
【発明の効果】以上説明したように、本発明によれば、
固体撮像素子等を用いたビデオカメラ、電子スチルカメ
ラ等に適し、小型で、ズーム比が３倍程度で、広角端状
態で６０°の画角を有し、諸収差、特に歪曲収差が良好
に補正され、高い生産性により容易に量産できる、沈胴
可能なズームレンズを提供できる。As described above, according to the present invention,
It is suitable for video cameras, electronic still cameras, etc. that use solid-state image pickup devices, etc., is compact, has a zoom ratio of about 3 times, has an angle of view of 60 ° in the wide-angle end state, and is excellent in various aberrations, especially distortion. It is possible to provide a retractable zoom lens that is corrected and can be easily mass-produced with high productivity.
【図１】本発明の第１実施例の広角端状態におけるレン
ズ断面図である。FIG. 1 is a lens sectional view in a wide-angle end state according to a first example of the present invention.
【図２】上記第１実施例の広角端状態における収差図で
ある。FIG. 2 is an aberration diagram in the wide-angle end state of the first example.
【図３】上記第１実施例の中間焦点距離状態における収
差図である。FIG. 3 is an aberration diagram in the intermediate focal length state of the first example.
【図４】上記第１実施例の望遠端状態における収差図で
ある。FIG. 4 is an aberration diagram in the telephoto end state of the first example.
【図５】本発明の第２実施例の広角端状態におけるレン
ズ断面図である。FIG. 5 is a lens sectional view in a wide-angle end state according to a second example of the present invention.
【図６】（ａ）,（ｂ）,（ｃ）は、それぞれ上記第２実
施例の広角端状態,中間焦点距離状態,望遠端状態におけ
る収差図である。6A, 6B, and 6C are aberration diagrams in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the second embodiment, respectively.
【図７】本発明の第３実施例の広角端状態におけるレン
ズ断面図である。FIG. 7 is a lens sectional view in a wide-angle end state according to a third example of the present invention.
【図８】（ａ）,（ｂ）,（ｃ）は、それぞれ上記第３実
施例の広角端状態,中間焦点距離状態,望遠端状態におけ
る収差図である。8A, 8B, and 8C are aberration diagrams in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the third embodiment, respectively.
【図９】本発明の第４実施例の広角端状態におけるレン
ズ断面図である。FIG. 9 is a lens sectional view in a wide-angle end state according to a fourth example of the present invention.
【図１０】上記第４実施例の広角端状態における収差図
である。FIG. 10 is an aberration diagram in a wide-angle end state of the fourth example.
【図１１】上記第４実施例の中間焦点距離状態における
収差図である。FIG. 11 is an aberration diagram in the intermediate focal length state of the fourth example.
【図１２】上記第４実施例の望遠端状態における収差図
である。FIG. 12 is an aberration diagram in a telephoto end state of the fourth example.
【図１３】本発明の第５実施例の広角端状態におけるレ
ンズ断面図である。FIG. 13 is a lens sectional view in a wide-angle end state according to a fifth example of the present invention.
【図１４】（ａ）,（ｂ）,（ｃ）は、それぞれ上記第５
実施例の広角端状態,中間焦点距離状態,望遠端状態にお
ける収差図である。14 (a), (b), and (c) are respectively the above-mentioned fifth.
FIG. 9 is an aberration diagram in a wide-angle end state, an intermediate focal length state, and a telephoto end state of Example.
【図１５】本発明の第６実施例の広角端状態におけるレ
ンズ断面図である。FIG. 15 is a lens sectional view in a wide-angle end state of a sixth embodiment of the present invention.
【図１６】上記第６実施例の広角端状態における収差図
である。FIG. 16 is an aberration diagram in a wide-angle end state of the sixth example.
【図１７】上記第６実施例の中間焦点距離状態における
収差図である。FIG. 17 is an aberration diagram in the intermediate focal length state of the sixth example.
【図１８】上記第６実施例の望遠端状態における収差図
である。FIG. 18 is an aberration diagram in a telephoto end state of the sixth example.
【図１９】本発明の第７実施例の広角端状態におけるレ
ンズ断面図である。FIG. 19 is a lens sectional view in a wide-angle end state according to a seventh example of the present invention.
【図２０】上記第７実施例の広角端状態における収差図
である。FIG. 20 is an aberration diagram in a wide-angle end state of the seventh example.
【図２１】上記第７実施例の中間焦点距離状態における
収差図である。FIG. 21 is an aberration diagram in the intermediate focal length state of the seventh example.
【図２２】上記第７実施例の望遠端状態における収差図
である。FIG. 22 is an aberration diagram in a telephoto end state of the seventh example.
Ｇ１ 第１レンズ群 Ｇ２ 第２レンズ群 Ｇ３ 第３レンズ群 Ｌ１ 第１レンズ群の最も物体側のレンズ Ｓ 開口絞り Ｐ１ ローパスフィルタ Ｐ２ カバー硝子 Ｉ 像面 G1 first lens group G2 Second lens group G3 Third lens group L1 lens closest to the object in the first lens group S aperture stop P1 low pass filter P2 cover glass I image plane
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Claims (7)
Ｇ１と、正屈折力の第２レンズ群Ｇ２と、正屈折力の第
３レンズ群Ｇ３とを有するズームレンズにおいて、 前記第１レンズ群Ｇ１は、物体側から順に、少なくと
も、第１の正屈折力のレンズと、負屈折力のレンズと、
第２の正屈折力のレンズとを含み、 前記第２レンズ群Ｇ２は、物体側から順に、開口絞り
と、少なくとも、第１の正屈折力のレンズと、第２の正
屈折力のレンズと、負屈折力のレンズとを含み、 前記第３レンズ群Ｇ３は、少なくとも１枚の正屈折力の
レンズを含むことを特徴とするズームレンズ。1. A zoom lens comprising, in order from the object side, a first lens group G1 having negative refractive power, a second lens group G2 having positive refractive power, and a third lens group G3 having positive refractive power, The first lens group G1 includes at least a first positive refractive power lens, a negative refractive power lens, and
The second lens group G2 includes, in order from the object side, an aperture stop, at least a lens having a first positive refractive power, and a lens having a second positive refractive power. , A lens having a negative refracting power, and the third lens group G3 includes at least one lens having a positive refracting power.
力のレンズＬ１は最も物体側に設けられ、 前記第１の正屈折力のレンズＬ１の焦点距離をｆＬ１、 前記第１レンズ群Ｇ１の焦点距離をｆＧ１とそれぞれし
たとき、 以下の条件を満足することを特徴とする請求項１に記載
のズームレンズ。 (１) １．５＜ｆＬ１／｜ｆＧ１｜＜１２2. The lens L1 having the first positive refracting power of the first lens group G1 is provided closest to the object side, and the focal length of the lens L1 having the first positive refracting power is fL1. The zoom lens according to claim 1, wherein the following conditions are satisfied when the focal length of the group G1 is fG1. (1) 1.5 <fL1 / | fG1 | <12
も１枚の前記負屈折力のレンズは、 前記第１レンズ群Ｇ１中の前記負屈折力のレンズの物体
側のレンズ面の曲率半径をｒ１、 前記第１レンズ群Ｇ１中の前記負屈折力のレンズの像側
のレンズ面の曲率半径をｒ２とそれぞれしたとき、以下
の条件を満足することを特徴とする請求項１又は２に記
載のズームレンズ。 (２) −１．４＜（ｒ２＋ｒ１）／（ｒ２−ｒ１）＜−０．１3. The at least one lens having the negative refracting power included in the first lens group G1 has a radius of curvature of a lens surface on the object side of the lens having the negative refracting power in the first lens group G1. r1, the following condition is satisfied, when the radius of curvature of the lens surface on the image side of the lens having the negative refractive power in the first lens group G1 is r2, respectively. Zoom lens. (2) -1.4 <(r2 + r1) / (r2-r1) <-0.1
折力のレンズは、 前記第２レンズ群Ｇ２中の前記負屈折力のレンズのｄ線
（λ＝５８７．６ｎｍ）に対する屈折率をｎｄ、 前記第２レンズ群Ｇ２中の前記負屈折力のレンズの像側
のレンズ面の曲率半径をｒ３、 前記第２レンズ群Ｇ２の焦点距離をｆＧ２とそれぞれし
たとき、以下の条件を満足することを特徴とする請求項
１乃至３のいずれか１項に記載のズームレンズ。 (３) ｎｄ＞１．７ (４) １．５＜ｆＧ２（ｎｄ−１)／ｒ３＜５4. The lens having the negative refracting power included in the second lens group G2 has a refractive index with respect to a d-line (λ = 587.6 nm) of the lens having the negative refracting power in the second lens group G2. nd, the radius of curvature of the image-side lens surface of the lens having the negative refractive power in the second lens group G2 is r3, and the focal length of the second lens group G2 is fG2, the following conditions are satisfied. The zoom lens according to claim 1, wherein the zoom lens is a zoom lens. (3) nd> 1.7 (4) 1.5 <fG2 (nd-1) / r3 <5
第１の正屈折力のレンズは、物体側のレンズ面は非球面
であり、像側のレンズ面には負屈折力のレンズが接合さ
れていることを特徴とする請求項２乃至４のいずれか１
項に記載のズームレンズ。5. The lens having the first positive refracting power closest to the object side in the first lens group G1 has an aspherical lens surface on the object side, and has a negative refracting power on the lens surface on the image side. 5. The structure according to any one of claims 2 to 4, characterized in that
The zoom lens according to item.
Ｇ１と、正屈折力の第２レンズ群Ｇ２と、正屈折力の第
３レンズ群Ｇ３とを有するズームレンズにおいて、 前記第１レンズ群Ｇ１は、物体側から順に、少なくと
も、第１の正屈折力のレンズと、負屈折力のレンズと、
第２の正屈折力のレンズとを含み、 前記第１レンズ群中の、前記第１の正屈折力のレンズ
と、前記負屈折力のレンズと、第２の正屈折力のレンズ
とは他のレンズと接合されておらず、 前記第２レンズ群Ｇ２は、物体側から順に、開口絞り
と、少なくとも、第１の正屈折力のレンズと、第２の正
屈折力のレンズと、負屈折力のレンズとを含み、 前記第３レンズ群Ｇ３は、少なくとも１枚の、正屈折力
のレンズを含むことを特徴とするズームレンズ。6. A zoom lens having, in order from the object side, a first lens group G1 having negative refractive power, a second lens group G2 having positive refractive power, and a third lens group G3 having positive refractive power, The first lens group G1 includes at least a first positive refractive power lens, a negative refractive power lens, and
A lens having a second positive refracting power, and the lens having the first positive refracting power, the lens having the negative refracting power, and the lens having the second positive refracting power in the first lens group are different from each other. The second lens group G2 includes, in order from the object side, an aperture stop, at least a lens having a first positive refracting power, a lens having a second positive refracting power, and a negative refracting power. A zoom lens, characterized in that the third lens group G3 includes at least one lens having a positive refractive power.
Ｇ１と、正屈折力の第２レンズ群Ｇ２と、正屈折力の第
３レンズ群Ｇ３とを有するズームレンズにおいて、 前記第１レンズ群Ｇ１は、物体側から順に、少なくと
も、第１の正屈折力のレンズと、負屈折力のレンズと、
第２の正屈折力のレンズとを含み、 前記第２レンズ群Ｇ２は、物体側から順に、開口絞り
と、少なくとも１枚の正屈折力のレンズと、負屈折力の
レンズとを含み、 前記正屈折力のレンズの中で最も厚い正屈折力のレンズ
は、物体側に凸面を向けた正メニスカスレンズであり、 前記第３レンズ群Ｇ３は、少なくとも１枚の正屈折力の
レンズとを含むことを特徴とするズームレンズ。7. A zoom lens comprising, in order from the object side, a first lens group G1 having negative refractive power, a second lens group G2 having positive refractive power, and a third lens group G3 having positive refractive power, The first lens group G1 includes at least a first positive refractive power lens, a negative refractive power lens, and
The second lens group G2 includes, in order from the object side, an aperture stop, at least one positive refractive power lens, and a negative refractive power lens. The thickest lens of positive refractive power among the lenses of positive refractive power is a positive meniscus lens having a convex surface facing the object side, and the third lens group G3 includes at least one lens of positive refractive power. This is a zoom lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001252017A JP2003066332A (en) | 2001-08-22 | 2001-08-22 | Zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001252017A JP2003066332A (en) | 2001-08-22 | 2001-08-22 | Zoom lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003066332A true JP2003066332A (en) | 2003-03-05 |
Family
ID=19080563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001252017A Withdrawn JP2003066332A (en) | 2001-08-22 | 2001-08-22 | Zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003066332A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1605291A2 (en) | 2004-06-10 | 2005-12-14 | Sony Corporation | Retrofocus-type zoom lens |
| JP2006011096A (en) * | 2004-06-25 | 2006-01-12 | Konica Minolta Opto Inc | Variable power optical system, imaging lens device and digital equipment |
| JP2015138120A (en) * | 2014-01-22 | 2015-07-30 | キヤノン株式会社 | Optical system and imaging device having the same |
| CN110196487A (en) * | 2019-06-17 | 2019-09-03 | 上海帆声图像科技有限公司 | A kind of telecentric lens |
-
2001
- 2001-08-22 JP JP2001252017A patent/JP2003066332A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1605291A2 (en) | 2004-06-10 | 2005-12-14 | Sony Corporation | Retrofocus-type zoom lens |
| US7133215B2 (en) | 2004-06-10 | 2006-11-07 | Sony Corporation | Varifocal zoom lens and camera system |
| JP2006011096A (en) * | 2004-06-25 | 2006-01-12 | Konica Minolta Opto Inc | Variable power optical system, imaging lens device and digital equipment |
| JP2015138120A (en) * | 2014-01-22 | 2015-07-30 | キヤノン株式会社 | Optical system and imaging device having the same |
| CN110196487A (en) * | 2019-06-17 | 2019-09-03 | 上海帆声图像科技有限公司 | A kind of telecentric lens |
| CN110196487B (en) * | 2019-06-17 | 2021-01-12 | 上海帆声图像科技有限公司 | Telecentric lens |
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