JP6942490B2 - Zoom lens and imaging device with it - Google Patents
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本発明はズームレンズ及びそれを有する撮像装置に関し、例えばビデオカメラ、電子スチルカメラ、放送用カメラ、監視カメラ等のように固体撮像素子を用いた撮像装置、或いは銀塩フィルムを用いたカメラ等の撮像装置に好適なものである。 The present invention relates to a zoom lens and an image pickup device having the same, for example, an image pickup device using a solid-state image pickup element such as a video camera, an electronic still camera, a broadcasting camera, a surveillance camera, or a camera using a silver salt film. It is suitable for an image pickup device.
近年、撮像装置は高機能化され、又装置全体が小型化されている。そしてそれに用いる撮像光学系としてはレンズ全長が短く、コンパクト（小型）で、高ズーム比（高変倍比）のズームレンズであること等が要求されている。これらの要求に応えるズームレンズとして、最も物体側に正の屈折力のレンズ群を配置したポジティブリード型のズームレンズが知られている（特許文献１乃至３）。 In recent years, the imaging device has become more sophisticated and the entire device has been miniaturized. The imaging optical system used for this is required to have a short overall lens length, a compact (small size), and a zoom lens having a high zoom ratio (high magnification ratio). As a zoom lens that meets these demands, a positive lead type zoom lens in which a lens group having a positive refractive power is arranged on the most object side is known (Patent Documents 1 to 3).
特許文献１では物体側より像側へ順に、正、負、正、負、正の屈折力の第１レンズ群ないし第５レンズ群より成るズーム比４７程度の５群構成のズームレンズを開示している。特許文献２では物体側より像側へ順に、正、負、正、負、正、負の屈折力の第１レンズ群ないし第６レンズ群より成る６群ズームレンズを開示している。特許文献３では物体側より像側へ順に、正、負、正、負、負、正の屈折力の第１レンズ群ないし第６レンズ群からなる６群ズームレンズを開示している。
Patent Document 1 discloses a zoom lens having a zoom ratio of about 47, which is composed of a first lens group to a fifth lens group having positive, negative, positive, negative, and positive refractive powers in order from the object side to the image side. ing.
ポジティブリード型のズームレンズは全系の小型化を図りつつ、高ズーム比化を図ることが比較的容易である。物体側から像側へ順に、正の屈折力の第１レンズ群、負の屈折力の第２レンズ群、それに続く１つ以上のレンズ群を含む後群よりなるポジティブリード型のズームレンズでは、第２レンズ群が主たる変倍作用をする。また第１レンズ群の有効径や第１レンズ群のレンズ群厚等の大きさがズームレンズ全体の大きさに大きく影響する。 It is relatively easy to achieve a high zoom ratio while reducing the size of the entire positive lead type zoom lens. In a positive lead type zoom lens consisting of a first lens group with a positive refractive power, a second lens group with a negative refractive power, and a rear group including one or more lens groups following it in order from the object side to the image side. The second lens group has the main scaling effect. Further, the size of the effective diameter of the first lens group, the thickness of the lens group of the first lens group, and the like greatly affects the size of the entire zoom lens.
このため、ポジティブリード型のズームレンズにおいて、全系の小型化を図りつつ、高ズーム比で全ズーム範囲にわたり高い光学性能を得るには、第１レンズ群と第２レンズ群の屈折力やレンズ構成等を適切に設定することが重要になってくる。特に全系の小型化を図りつつ、高ズーム比化を達成するには、ズーミングに際しての第１レンズ群や第２レンズ群の移動方向や移動量等の移動条件を適切に設定することが重要になってくる。これらの構成を適切に設定しないと、全系の小型化を図りつつ、高ズーム比で、しかも全ズーム範囲で高い光学性能のズームレンズを得るのが難しくなってくる。 For this reason, in order to obtain high optical performance over the entire zoom range with a high zoom ratio while reducing the size of the entire system in a positive lead type zoom lens, the refractive power of the first lens group and the second lens group and the lens It is important to properly set the configuration and so on. In particular, in order to achieve a high zoom ratio while reducing the size of the entire system, it is important to appropriately set the movement conditions such as the movement direction and movement amount of the first lens group and the second lens group during zooming. It becomes. If these configurations are not set appropriately, it will be difficult to obtain a zoom lens with a high zoom ratio and high optical performance over the entire zoom range while reducing the size of the entire system.
本発明は、高ズーム比でズーム全域で良好な光学特性が得られるズームレンズ及びそれを有する撮像装置の提供を目的とする。 An object of the present invention is to provide a zoom lens capable of obtaining good optical characteristics over the entire zoom range at a high zoom ratio and an image pickup apparatus having the same.
本発明のズームレンズは、物体側から像側へ順に配置された、正の屈折力の第１レンズ群、負の屈折力の第２レンズ群、１つ以上のレンズ群を含む全体として正の屈折力の後群より構成され、広角端から望遠端へのズーミングに際して、前記第１レンズ群が物体側に移動し、ズーミングに際して隣り合うレンズ群の間隔が変化するズームレンズにおいて、前記第２レンズ群は３枚以上の負レンズと２枚以上の正レンズを有し、前記第２レンズ群に含まれる負レンズの材料の屈折率の平均値をＮｎａ、前記第２レンズ群に含まれる正レンズの材料の屈折率の平均値をＮｐａ、望遠端における全系の焦点距離をｆｔ、前記第２レンズ群の焦点距離をｆ２、前記第１レンズ群の焦点距離をｆ１、広角端における全系の焦点距離をｆｗ、前記第２レンズ群に含まれる正レンズの焦点距離の平均値をｆｐａとするとき、
１．０＜Ｎｎａ／Ｎｐａ＜２．０
０．０１＜｜ｆ２／ｆｔ｜＜０．１０
１０．０＜ｆ１／ｆｗ＜４０．０
０．５＜｜ｆｐａ／ｆ２｜＜６．０
なる条件式を満足することを特徴としている。
また、本発明の他のズームレンズは、物体側から像側へ順に配置された、正の屈折力の第１レンズ群、負の屈折力の第２レンズ群、１つ以上のレンズ群を含む全体として正の屈折力の後群より構成され、広角端から望遠端へのズーミングに際して、前記第１レンズ群が物体側に移動し、ズーミングに際して隣り合うレンズ群の間隔が変化するズームレンズにおいて、前記後群は、物体側から像側へ順に配置された、正の屈折力の第３レンズ群、負の屈折力の第４レンズ群、負の屈折力の第５レンズ群から構成され、前記第２レンズ群は３枚以上の負レンズと２枚以上の正レンズを有し、前記第２レンズ群に含まれる負レンズの材料の屈折率の平均値をＮｎａ、前記第２レンズ群に含まれる正レンズの材料の屈折率の平均値をＮｐａ、前記第２レンズ群に含まれる正レンズの焦点距離の平均値をｆｐａ、前記第２レンズ群の焦点距離をｆ２とするとき、
１．０＜Ｎｎａ／Ｎｐａ＜２．０
０．５＜｜ｆｐａ／ｆ２｜＜６．０
なる条件式を満足することを特徴とする。
また、本発明の他のズームレンズは、物体側から像側へ順に配置された、正の屈折力の第１レンズ群、負の屈折力の第２レンズ群、１つ以上のレンズ群を含む全体として正の屈折力の後群より構成され、広角端から望遠端へのズーミングに際して、前記第１レンズ群が物体側に移動し、ズーミングに際して隣り合うレンズ群の間隔が変化するズームレンズにおいて、前記後群は、物体側から像側へ順に配置された、正の屈折力の第３レンズ群、負の屈折力の第４レンズ群、負の屈折力の第５レンズ群、正の屈折力の第６レンズ群から構成され、前記第２レンズ群は３枚以上の負レンズと２枚以上の正レンズを有し、前記第２レンズ群に含まれる負レンズの材料の屈折率の平均値をＮｎａ、前記第２レンズ群に含まれる正レンズの材料の屈折率の平均値をＮｐａ、前記第２レンズ群に含まれる正レンズの焦点距離の平均値をｆｐａ、前記第２レンズ群の焦点距離をｆ２とするとき、
１．０＜Ｎｎａ／Ｎｐａ＜２．０
０．５＜｜ｆｐａ／ｆ２｜＜６．０
なる条件式を満足することを特徴とする。
The zoom lens of the present invention is positive as a whole including a first lens group having a positive refractive force, a second lens group having a negative refractive force, and one or more lens groups arranged in order from the object side to the image side. consists Ri by the group after refractive power, upon zooming from the wide-angle end to the telephoto end, the first lens group moves toward the object side, a zoom lens system distance lens units vary adjacent zooming, the second The lens group has three or more negative lenses and two or more positive lenses, and the average value of the refractive index of the negative lens material included in the second lens group is Nna, and the positive lens group included in the second lens group. The average value of the refractive index of the lens material is Npa , the focal distance of the entire system at the telephoto end is ft, the focal distance of the second lens group is f2, the focal distance of the first lens group is f1, and the entire system at the wide-angle end. When the focal distance of is fw and the average value of the focal distances of the positive lenses included in the second lens group is fpa ,
1.0 <Nna / Npa <2.0
0.01 << | f2 / ft | <0.10
10.0 <f1 / fw <40.0
0.5 << | fpa / f2 | <6.0
It is characterized by satisfying the conditional expression.
Further, the other zoom lens of the present invention includes a first lens group having a positive refractive force, a second lens group having a negative refractive force, and one or more lens groups arranged in order from the object side to the image side. In a zoom lens that is composed of a rear group of positive refractive force as a whole, the first lens group moves to the object side during zooming from the wide-angle end to the telescopic end, and the distance between adjacent lens groups changes during zooming. The rear group is composed of a third lens group having a positive refractive force, a fourth lens group having a negative refractive force, and a fifth lens group having a negative refractive force arranged in order from the object side to the image side. The second lens group has three or more negative lenses and two or more positive lenses, and the average value of the refractive index of the negative lens material included in the second lens group is Nna, which is included in the second lens group. When the average value of the refractive index of the material of the positive lens is Npa, the average value of the focal distances of the positive lenses included in the second lens group is fpa, and the focal distance of the second lens group is f2.
1.0 <Nna / Npa <2.0
0.5 << | fpa / f2 | <6.0
It is characterized in that it satisfies the conditional expression.
Further, the other zoom lens of the present invention includes a first lens group having a positive refractive force, a second lens group having a negative refractive force, and one or more lens groups arranged in order from the object side to the image side. In a zoom lens that is composed of a rear group of positive refractive force as a whole, the first lens group moves to the object side during zooming from the wide-angle end to the telescopic end, and the distance between adjacent lens groups changes during zooming. The rear group includes a third lens group having a positive refractive force, a fourth lens group having a negative refractive force, a fifth lens group having a negative refractive force, and a positive refractive force arranged in order from the object side to the image side. The second lens group has three or more negative lenses and two or more positive lenses, and the average value of the refractive index of the material of the negative lens included in the second lens group. Nna, the average value of the refractive index of the material of the positive lens included in the second lens group is Npa, the average value of the focal distances of the positive lenses included in the second lens group is fpa, and the focal point of the second lens group. When the distance is f2,
1.0 <Nna / Npa <2.0
0.5 << | fpa / f2 | <6.0
It is characterized in that it satisfies the conditional expression.
本発明によれば、高ズーム比でズーム全域で良好な光学特性が得られるズームレンズ及びそれを有する撮像装置が得られる。 According to the present invention, it is possible to obtain a zoom lens capable of obtaining good optical characteristics over the entire zoom range at a high zoom ratio and an imaging device having the same.
本発明のズームレンズは、物体側より像側へ順に配置された、正の屈折力の第１レンズ群、負の屈折力の第２レンズ群、その後に続く１つ以上のレンズ群を含む全ズーム範囲にわたり全体として正の屈折力の後群を有している。広角端から望遠端へのズーミングの際に第１レンズ群が光軸上を物体側へ移動する。またズーミングに際して隣り合うレンズ群の間隔が変化する。 The zoom lens of the present invention includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, and one or more lens groups following the lens group arranged in order from the object side to the image side. It has a rear group of positive refractive power as a whole over the zoom range. When zooming from the wide-angle end to the telephoto end, the first lens group moves toward the object on the optical axis. In addition, the distance between adjacent lens groups changes during zooming.
図１は本発明の実施例１のズームレンズの広角端（単焦点距離端）におけるレンズ断面図である。図２（Ａ）、（Ｂ）はそれぞれ実施例１のズームレンズの広角端、望遠端（長焦点距離端）における収差図である。実施例１はズーム比９４．２４、Ｆナンバー２．８８〜６．６９のズームレンズである。 FIG. 1 is a cross-sectional view of a zoom lens according to a first embodiment of the present invention at a wide-angle end (single focal length end). 2 (A) and 2 (B) are aberration diagrams at the wide-angle end and the telephoto end (long focal length end) of the zoom lens of the first embodiment, respectively. The first embodiment is a zoom lens having a zoom ratio of 94.24 and an F number of 2.88 to 6.69.
図３は本発明の実施例２のズームレンズの広角端におけるレンズ断面図である。図４（Ａ）、（Ｂ）はそれぞれ実施例２のズームレンズの広角端、望遠端における収差図である。実施例２はズーム比９４．２４、Ｆナンバー２．８８〜６．６９のズームレンズである。図５は本発明の実施例３のズームレンズの広角端におけるレンズ断面図である。図６（Ａ）、（Ｂ）はそれぞれ実施例３のズームレンズの広角端、望遠端における収差図である。実施例３はズーム比３９．０４、Ｆナンバー２．８８〜６．４９のズームレンズである。 FIG. 3 is a cross-sectional view of the lens at the wide-angle end of the zoom lens according to the second embodiment of the present invention. 4 (A) and 4 (B) are aberration diagrams at the wide-angle end and the telephoto end of the zoom lens of the second embodiment, respectively. The second embodiment is a zoom lens having a zoom ratio of 94.24 and an F number of 2.88 to 6.69. FIG. 5 is a cross-sectional view of the lens at the wide-angle end of the zoom lens according to the third embodiment of the present invention. 6 (A) and 6 (B) are aberration diagrams at the wide-angle end and the telephoto end of the zoom lens of the third embodiment, respectively. Example 3 is a zoom lens having a zoom ratio of 39.04 and an F number of 2.88 to 6.49.
図７は本発明の実施例４のズームレンズの広角端におけるレンズ断面図である。図８（Ａ）、（Ｂ）はそれぞれ実施例４のズームレンズの広角端、望遠端における収差図である。実施例４はズーム比３９．０４、Ｆナンバー２．８８〜６．４９のズームレンズである。図９は本発明の撮像装置の要部概略図である。 FIG. 7 is a cross-sectional view of the lens at the wide-angle end of the zoom lens according to the fourth embodiment of the present invention. 8 (A) and 8 (B) are aberration diagrams at the wide-angle end and the telephoto end of the zoom lens of the fourth embodiment, respectively. Example 4 is a zoom lens having a zoom ratio of 39.04 and an F number of 2.88 to 6.49. FIG. 9 is a schematic view of a main part of the image pickup apparatus of the present invention.
各実施例のズームレンズはビデオカメラ、デジタルカメラ、ＴＶカメラ、監視用カメラ、そして銀塩フィルムカメラ等の撮像装置に用いられる撮像光学系である。レンズ断面図において、左方が被写体側（物体側）（前方）で、右方が像側（後方）である。レンズ断面図において、ｉは物体側からのレンズ群の順番を示し、Ｌｉは第ｉレンズ群である。ＬＢは１つ以上のレンズ群を含む後群である。 The zoom lens of each embodiment is an imaging optical system used in an imaging device such as a video camera, a digital camera, a TV camera, a surveillance camera, and a silver halide film camera. In the lens cross section, the left side is the subject side (object side) (front), and the right side is the image side (rear). In the lens cross-sectional view, i indicates the order of the lens groups from the object side, and Li is the i-th lens group. LB is a posterior group that includes one or more lens groups.
レンズ断面図において、ＳＰは開口絞りであり、第２レンズ群Ｌ２と第３レンズ群Ｌ３の間に配置している。レンズ断面図においてＩＰは像面であり、ビデオカメラやデジタルスチルカメラの撮影光学系として使用する際にはＣＣＤセンサやＣＭＯＳセンサ等の固体撮像素子（光電変換素子）が像面に銀塩フィルム用カメラのときはフィルム面に相当する感光面が置かれる。 In the lens cross-sectional view, SP is an aperture diaphragm and is arranged between the second lens group L2 and the third lens group L3. In the lens sectional view, IP is an image plane, and when used as a photographing optical system for a video camera or a digital still camera, a solid-state image sensor (photoelectric conversion element) such as a CCD sensor or CMOS sensor is used for the silver salt film on the image plane. In the case of a camera, a photosensitive surface corresponding to the film surface is placed.
矢印は広角端から望遠端へのズーミング（変倍）に際して、各レンズ群と開口絞りＳＰの移動軌跡を示している。フォーカシングは第４レンズ群Ｌ４を移動させて行っている。無限遠から至近へのフォーカシングに際して第４レンズ群Ｌ４は像側へ移動する。収差図のうち球面収差において、実線のｄはｄ線（波長５８７．６ｎｍ）、２点鎖線のｇはｇ線（波長４３５．８ｎｍ）である。非点収差図において点線のＭはｄ線のメリディオナル像面、実線のＳはｄ線のサジタル像面である。倍率色収差はｇ線によって表している。ωは半画角（撮影画角の半分の値）（度）、ＦｎｏはＦナンバーである。 The arrow indicates the movement locus of each lens group and aperture aperture SP during zooming (magnification) from the wide-angle end to the telephoto end. Focusing is performed by moving the fourth lens group L4. When focusing from infinity to close range, the fourth lens group L4 moves to the image side. In the aberration diagram, in spherical aberration, the solid line d is the d line (wavelength 587.6 nm), and the two-dot chain line g is the g line (wavelength 435.8 nm). In the astigmatism diagram, the dotted line M is the meridional image plane of the d line, and the solid line S is the sagittal image plane of the d line. Chromatic aberration of magnification is represented by the g-line. ω is a half angle of view (half the angle of view taken) (degrees), and Fno is an F number.
ポジティブリード型のズームレンズにおいては、高ズーム比化と全系の小型化を図りつつ、物体距離全般にわたり良好な光学性能を得ることが重要な課題となっている。この課題を解決するためには、各レンズ群の屈折力やレンズ構成、そして各レンズ群のズーミングに伴う移動条件を適切に設定することが重要となる。 In the positive lead type zoom lens, it is an important issue to obtain good optical performance over the entire object distance while achieving a high zoom ratio and downsizing of the entire system. In order to solve this problem, it is important to appropriately set the refractive power of each lens group, the lens configuration, and the movement conditions associated with zooming of each lens group.
本発明のズームレンズは、物体側から像側へ順に配置された、正の屈折力の第１レンズ群Ｌ１、負の屈折力の第２レンズ群Ｌ２、１つ以上のレンズ群を含む全体として正の屈折力の後群ＬＢより構成されている。広角端から望遠端へのズーミングに際して、第１レンズ群Ｌ１が物体側に移動し、ズーミングに際して隣り合うレンズ群の間隔が変化する。第２レンズ群Ｌ２は３枚以上の負レンズと２枚以上の正レンズを有している。第２レンズ群Ｌ２に含まれる負レンズの材料の屈折率の平均値をＮｎａ、第２レンズ群Ｌ２に含まれる正レンズの材料の屈折率の平均値をＮｐａとする。 The zoom lens of the present invention includes a first lens group L1 having a positive refractive power, a second lens group L2 having a negative refractive power, and one or more lens groups arranged in order from the object side to the image side. It is composed of the rear group LB of positive refractive power. When zooming from the wide-angle end to the telephoto end, the first lens group L1 moves to the object side, and the distance between adjacent lens groups changes during zooming. The second lens group L2 has three or more negative lenses and two or more positive lenses. Let Nna be the average value of the refractive index of the material of the negative lens included in the second lens group L2, and Npa be the average value of the refractive index of the material of the positive lens included in the second lens group L2.
このとき、
１．０＜Ｎｎａ／Ｎｐａ＜２．０ ・・・（１）
なる条件式を満足する。
At this time,
1.0 <Nna / Npa <2.0 ... (1)
Satisfies the conditional expression.
次に前述の各条件式の技術的意味について説明する。条件式（１）は第２レンズ群Ｌ２に含まれる正レンズの材料の屈折率と負レンズの材料の屈折率の比を規定する。条件式（１）を満足することで、第２レンズ群Ｌ２の負の屈折力を強くしても（負の屈折力の絶対値を大きくしても）全ズーム範囲にわたり像面湾曲の変動を少なくしつつ、高ズーム比化を図りつつ、高い光学性能を得ている。 Next, the technical meaning of each of the above conditional expressions will be described. Conditional expression (1) defines the ratio of the refractive index of the material of the positive lens and the refractive index of the material of the negative lens included in the second lens group L2. By satisfying the conditional equation (1), even if the negative refractive power of the second lens group L2 is increased (even if the absolute value of the negative refractive power is increased), the curvature of field can be changed over the entire zoom range. High optical performance is obtained while reducing the number and increasing the zoom ratio.
条件式（１）の上限を超えて第２レンズ群Ｌ２に含まれる負レンズの材料の屈折率と正レンズの材料の屈折率の比が大きくなりすぎると、第２レンズ群Ｌ２に含まれる負レンズの材料のアッベ数と正レンズの材料のアッベ数の比を大きくすることが困難になる。この結果、第２レンズ群Ｌ２での色収差の補正が困難となる。このためズーミングに伴う軸上色収差、倍率色収差の変動を小さくすることが困難となる。 If the ratio of the refractive index of the negative lens material and the refractive index of the positive lens material included in the second lens group L2 becomes too large beyond the upper limit of the conditional expression (1), the negative lens group L2 included in the second lens group L2. It becomes difficult to increase the ratio of the Abbe number of the lens material to the Abbe number of the positive lens material. As a result, it becomes difficult to correct the chromatic aberration in the second lens group L2. Therefore, it is difficult to reduce fluctuations in axial chromatic aberration and chromatic aberration of magnification due to zooming.
条件式（１）の下限を超えて、第２レンズ群Ｌ２に含まれる正レンズの材料の屈折率が負レンズの材料の屈折率より高くなると、第２レンズ群Ｌ２でのペッツバール和の補正が困難となる。このためズーミングに伴う像面湾曲の変動を小さくすることが困難となる。 When the refractive index of the material of the positive lens included in the second lens group L2 becomes higher than the refractive index of the material of the negative lens beyond the lower limit of the conditional expression (1), the correction of the Petzval sum in the second lens group L2 is performed. It will be difficult. Therefore, it is difficult to reduce the fluctuation of curvature of field due to zooming.
好ましくは条件式（１）の数値範囲を次の如く設定するのが良い。
１．０３＜Ｎｎａ／Ｎｐａ＜１．２０ ・・・（１ａ）
It is preferable to set the numerical range of the conditional expression (1) as follows.
1.03 <Nna / Npa <1.20 ... (1a)
各実施例のズームレンズにおいて、好ましくは次の条件式のうち１以上を満足するのが良い。望遠端における全系の焦点距離をｆｔ、第２レンズ群Ｌ２の焦点距離をｆ２とする。第１レンズ群Ｌ１の焦点距離をｆ１、広角端における全系の焦点距離をｆｗとする。第２レンズ群Ｌ２に含まれる正レンズの焦点距離の平均値をｆｐａとする。第２レンズ群Ｌ２に含まれる正レンズの材料の屈折率の平均値をＮｐａとする。広角端から望遠端へのズーミングにおける第２レンズ群Ｌ２の移動量をｍ２とする。 In the zoom lens of each embodiment, it is preferable that one or more of the following conditional expressions are satisfied. Let ft be the focal length of the entire system at the telephoto end, and f2 be the focal length of the second lens group L2. The focal length of the first lens group L1 is f1, and the focal length of the entire system at the wide-angle end is fw. Let fpa be the average value of the focal lengths of the positive lenses included in the second lens group L2. Let Npa be the average value of the refractive indexes of the materials of the positive lens included in the second lens group L2. Let m2 be the amount of movement of the second lens group L2 in zooming from the wide-angle end to the telephoto end.
ここでレンズ群の移動量とは広角端におけるレンズ群の光軸上の位置と望遠端におけるレンズ群の光軸上の位置の差をいう。移動量の符号は広角端に比べて望遠端において像側に位置するときを正、物体側に位置するときを負とする。 Here, the amount of movement of the lens group means the difference between the position of the lens group on the optical axis at the wide-angle end and the position of the lens group on the optical axis at the telephoto end. The sign of the amount of movement is positive when it is located on the image side at the telephoto end and negative when it is located on the object side compared to the wide-angle end.
このとき、次の条件式のうち１つ以上を満足するのが良い。
０．０１＜｜ｆ２／ｆｔ｜＜０．１０ ・・・（２）
５．０＜ｆ１／ｆｗ＜４０．０ ・・・（３）
０．５＜｜ｆｐａ／ｆ２｜＜６．０ ・・・（４）
１．６０＜Ｎｐａ＜１．９５ ・・・（５）
０．０＜ｍ２／ｆｔ＜３．０ ・・・（６）
At this time, it is preferable to satisfy one or more of the following conditional expressions.
0.01 << | f2 / ft | <0.10 ... (2)
5.0 <f1 / fw <40.0 ... (3)
0.5 << | fpa / f2 | <6.0 ... (4)
1.60 <Npa <1.95 ... (5)
0.0 <m2 / ft <3.0 ... (6)
次に前述の各条件式の技術的意味について説明する。条件式（２）は第２レンズ群Ｌ２の焦点距離を規定する。条件式（２）を満足することで、広角端におけるレトロフォーカス型の屈折力配置（パワー配置）とすることが容易となる。この結果、広角端の広画角化と、全ズーム範囲にわたり諸収差の変動が少なく、画面全体にわたり高い光学性能を得ることが容易となる。 Next, the technical meaning of each of the above conditional expressions will be described. The conditional expression (2) defines the focal length of the second lens group L2. By satisfying the conditional expression (2), it becomes easy to adopt a retrofocus type refractive power arrangement (power arrangement) at the wide-angle end. As a result, it becomes easy to widen the angle of view at the wide-angle end, reduce fluctuations in various aberrations over the entire zoom range, and obtain high optical performance over the entire screen.
条件式（２）の下限を超えて第２レンズ群Ｌ２の負の屈折力が強くなりすぎると、ズーミングに伴う球面収差、倍率色収差の変動を小さくするのが困難となる。又、第２レンズ群Ｌ２による軸上光束の発散作用が大きくなり過ぎるために後続レンズ群の小型化が困難になってくる。条件式（２）の上限を超えて第２レンズ群Ｌ２の負の屈折力が弱くなりすぎると広角端においてレトロフォーカス型の屈折力配置とするのが難しくなり、広角端における撮像画角を広くすることが困難となる。 If the negative refractive power of the second lens group L2 becomes too strong beyond the lower limit of the conditional expression (2), it becomes difficult to reduce fluctuations in spherical aberration and chromatic aberration of magnification due to zooming. Further, since the divergence action of the axial luminous flux by the second lens group L2 becomes too large, it becomes difficult to reduce the size of the subsequent lens group. If the negative refractive power of the second lens group L2 becomes too weak beyond the upper limit of the conditional expression (2), it becomes difficult to make a retrofocus type refractive power arrangement at the wide-angle end, and the imaging angle of view at the wide-angle end is widened. It becomes difficult to do.
条件式（３）は第１レンズ群Ｌ１の焦点距離を規定する。条件式（３）の上限を超えて第１レンズ群Ｌ１の正の屈折力が弱くなりすぎると、変倍のために第１レンズ群Ｌ１の移動量を大きくしなければならず、この結果、望遠端においてレンズ全長が長くなってくるので良くない。又、前玉有効径の小型化が難しくなる。条件式（３）の下限を超えて第１レンズ群Ｌ１の正の屈折力が強くなりすぎると、高ズーム比化は容易となるが、望遠端において球面収差の補正が困難となる。 The conditional expression (3) defines the focal length of the first lens group L1. If the positive refractive power of the first lens group L1 becomes too weak beyond the upper limit of the conditional expression (3), the amount of movement of the first lens group L1 must be increased for scaling, and as a result, the amount of movement of the first lens group L1 must be increased. It is not good because the total length of the lens becomes long at the telephoto end. In addition, it becomes difficult to reduce the effective diameter of the front lens. If the positive refractive power of the first lens group L1 becomes too strong beyond the lower limit of the conditional expression (3), it becomes easy to increase the zoom ratio, but it becomes difficult to correct the spherical aberration at the telephoto end.
条件式（４）は第２レンズ群Ｌ２に含まれる正レンズの屈折力の平均値を規定する。条件式（４）を満足することで、第２レンズ群Ｌ２の負の屈折力を強くしても全ズーム範囲にわたり像面湾曲の変動を少なくしつつ、高ズーム比化を図りつつ、高い光学性能を得ている。 The conditional expression (4) defines the average value of the refractive powers of the positive lenses included in the second lens group L2. By satisfying the conditional expression (4), even if the negative refractive power of the second lens group L2 is strengthened, the fluctuation of the curvature of field over the entire zoom range is reduced, the zoom ratio is increased, and the optics is high. I'm getting performance.
条件式（４）の上限を超えて第２レンズ群Ｌ２に含まれる正レンズの屈折力の平均値が弱くなりすぎると、第２レンズ群Ｌ２でのペッツバール和の補正が困難となる。このためズーミングに伴う像面湾曲の変動を小さくすることが困難となる。条件式（４）の下限を超えて第２レンズ群Ｌ２に含まれる正レンズの屈折力の平均値が強くなりすぎると、広角端において歪曲収差の補正、望遠端において球面収差の補正が困難となる。 If the average value of the refractive powers of the positive lenses included in the second lens group L2 becomes too weak beyond the upper limit of the conditional expression (4), it becomes difficult to correct the Petzval sum in the second lens group L2. Therefore, it is difficult to reduce the fluctuation of curvature of field due to zooming. If the average value of the refractive power of the positive lens included in the second lens group L2 exceeds the lower limit of the conditional equation (4) and becomes too strong, it becomes difficult to correct the distortion at the wide-angle end and the spherical aberration at the telephoto end. Become.
条件式（５）は第２レンズ群Ｌ２に含まれる正レンズの材料の屈折率の平均値を規定する。条件式（５）を満足することで、第２レンズ群Ｌ２の負の屈折力を強くしても全ズーム範囲にわたり像面湾曲の変動を少なくしつつ、高ズーム比化を図りつつ、高い光学性能を得ている。条件式（５）の上限を超えて第２レンズ群Ｌ２に含まれる正レンズの材料の屈折率の平均値が高くなりすぎると、第２レンズ群Ｌ２でのペッツバール和の補正が困難となる。このためズーミングに伴う像面湾曲の変動を小さくすることが困難となる。 The conditional expression (5) defines the average value of the refractive indexes of the materials of the positive lens included in the second lens group L2. By satisfying the conditional expression (5), even if the negative refractive power of the second lens group L2 is strengthened, the fluctuation of the curvature of field is reduced over the entire zoom range, the zoom ratio is increased, and the optics is high. I'm getting performance. If the average value of the refractive indexes of the materials of the positive lens included in the second lens group L2 becomes too high beyond the upper limit of the conditional expression (5), it becomes difficult to correct the Petzval sum in the second lens group L2. Therefore, it is difficult to reduce the fluctuation of curvature of field due to zooming.
条件式（５）の下限を超えて第２レンズ群Ｌ２に含まれる正レンズの材料の屈折率が低くなりすぎると、第２レンズ群Ｌ２に含まれる負レンズの材料のアッベ数と正レンズの材料のアッベ数の比を大きくすることが困難となる。この結果、第２レンズ群Ｌ２での色収差の補正が困難となる。このためズーミングに伴う軸上色収差、倍率色収差の変動を小さくすることが困難となる。 If the refractive index of the positive lens material included in the second lens group L2 becomes too low beyond the lower limit of the conditional expression (5), the Abbe number of the negative lens material included in the second lens group L2 and the positive lens It becomes difficult to increase the ratio of Abbe numbers of materials. As a result, it becomes difficult to correct the chromatic aberration in the second lens group L2. Therefore, it is difficult to reduce fluctuations in axial chromatic aberration and chromatic aberration of magnification due to zooming.
条件式（６）は広角端から望遠端へのズーミングにおける第２レンズ群Ｌ２の移動量を適切に設定するものである。条件式（６）の上限を超え、第２レンズ群Ｌ２の移動量が大きくなりすぎると、ズーミングに伴う球面収差、倍率色収差の変動を小さくするのが困難となる。又、広角端でのレンズ全長が長くなり、前玉有効径の小型化が困難となる。条件式（６）の下限を超え、第２レンズ群Ｌ２の移動量が小さくなりすぎると、所定のズーム比を確保するため第１レンズ群Ｌ１の移動量が大きくなり、望遠端におけるレンズ全長の短縮が困難となる。 Conditional expression (6) appropriately sets the amount of movement of the second lens group L2 in zooming from the wide-angle end to the telephoto end. If the upper limit of the conditional expression (6) is exceeded and the amount of movement of the second lens group L2 becomes too large, it becomes difficult to reduce fluctuations in spherical aberration and chromatic aberration of magnification due to zooming. In addition, the total length of the lens at the wide-angle end becomes long, and it becomes difficult to reduce the effective diameter of the front lens. If the lower limit of the conditional expression (6) is exceeded and the amount of movement of the second lens group L2 becomes too small, the amount of movement of the first lens group L1 becomes large in order to secure a predetermined zoom ratio, and the total length of the lens at the telephoto end becomes large. It becomes difficult to shorten.
尚、各実施例において更に好ましくは前述の条件式（２）乃至（６）の数値範囲を以下の如く設定するのが良い。
０．０２＜｜ｆ２／ｆｔ｜＜０．０５ ・・・（２ａ）
１０．０＜ｆ１／ｆｗ＜３５．０ ・・・（３ａ）
１．０＜｜ｆｐａ／ｆ２｜＜５．０ ・・・（４ａ）
１．６５＜Ｎｐａ＜１．９０ ・・・（５ａ）
０．００＜ｍ２／ｆｔ＜０．０５ ・・・（６ａ）
In each embodiment, it is more preferable to set the numerical range of the above-mentioned conditional expressions (2) to (6) as follows.
0.02 << | f2 / ft | <0.05 ... (2a)
10.0 <f1 / fw <35.0 ... (3a)
1.0 << | fpa / f2 | <5.0 ... (4a)
1.65 <Npa <1.90 ... (5a)
0.00 <m2 / ft <0.05 ... (6a)
以上のように各実施例によれば、高い結像性能を有し、高変倍比を実現すると共に、小型のズームレンズ及びそれを有する撮像装置を提供することができる。 As described above, according to each embodiment, it is possible to provide a small zoom lens and an imaging device having the same, while having high imaging performance and achieving a high magnification ratio.
各実施例において第２レンズ群Ｌ２は像側に凸面を向けた接合レンズ面を有するのが良い。これによれば色収差の補正が容易になる。 In each embodiment, the second lens group L2 preferably has a bonded lens surface with a convex surface facing the image side. This facilitates the correction of chromatic aberration.
各実施例において後群ＬＢは次の構成よりなっている。後群ＬＢは、物体側から像側へ順に、正の屈折力の第３レンズ群Ｌ３、負の屈折力の第４レンズ群Ｌ４、正の屈折力の第５レンズ群Ｌ５から構成される。この他、後群ＬＢは、物体側から像側へ順に、正の屈折力の第３レンズ群Ｌ３、負の屈折力の第４レンズ群Ｌ４、正の屈折力の第５レンズ群Ｌ５、負の屈折力の第６レンズ群Ｌ６から構成される。 In each example, the rear group LB has the following configuration. The rear group LB is composed of a third lens group L3 having a positive refractive power, a fourth lens group L4 having a negative refractive power, and a fifth lens group L5 having a positive refractive power in this order from the object side to the image side. In addition, in the rear group LB, in order from the object side to the image side, the third lens group L3 having a positive refractive power, the fourth lens group L4 having a negative refractive power, the fifth lens group L5 having a positive refractive power, and negative. It is composed of the sixth lens group L6 having the refractive power of.
この他、後群ＬＢは、物体側から像側へ順に、正の屈折力の第３レンズ群Ｌ３、負の屈折力の第４レンズ群Ｌ４、負の屈折力の第５レンズ群Ｌ５、負の屈折力の第６レンズ群Ｌ６から構成される。この他、後群ＬＢは、物体側から像側へ順に、正の屈折力の第３レンズ群Ｌ３、負の屈折力の第４レンズ群Ｌ４、負の屈折力の第５レンズ群Ｌ５、から構成される。 In addition, in the rear group LB, in order from the object side to the image side, the third lens group L3 with a positive refractive power, the fourth lens group L4 with a negative refractive power, the fifth lens group L5 with a negative refractive power, and negative It is composed of the sixth lens group L6 having the refractive power of. In addition, the rear group LB starts from the third lens group L3 with a positive refractive power, the fourth lens group L4 with a negative refractive power, and the fifth lens group L5 with a negative refractive power in order from the object side to the image side. It is composed.
次に各実施例にレンズ構成について説明する。図１の実施例１のレンズ断面図においてＬ１は正の屈折力の第１レンズ群、Ｌ２は負の屈折力の第２レンズ群、Ｌ３は正の屈折力の第３レンズ群、Ｌ４は負の屈折力の第４レンズ群、Ｌ５は正の屈折力の第５レンズ群である。第３レンズ群Ｌ３乃至第５レンズ群Ｌ５は全体として正の屈折力の後群ＬＢを構成している。 Next, the lens configuration will be described in each embodiment. In the lens sectional view of Example 1 of FIG. 1, L1 is a first lens group having a positive refractive power, L2 is a second lens group having a negative refractive power, L3 is a third lens group having a positive refractive power, and L4 is a negative lens group. The fourth lens group of the refractive power of L5 is the fifth lens group of the positive refractive power. The third lens group L3 to the fifth lens group L5 together constitute a rear group LB having a positive refractive power.
実施例１では広角端から望遠端へのズーミングに際して矢印の如く第１レンズ群Ｌ１は物体側へ移動している。第２レンズ群Ｌ２は第１レンズ群Ｌ１との間隔を大にしつつ像側へ移動している。第３レンズ群Ｌ３は第２レンズ群Ｌ２との間隔を小にしつつ物体側へ移動している。第４レンズ群Ｌ４は第３レンズ群Ｌ３との間隔を大にしつつ物体側へ移動している。第５レンズ群Ｌ５は第４レンズ群Ｌ４との間隔を大にしつつ物体側へ移動している。開口絞りＳＰは第３レンズ群Ｌ３との間隔を小にしつつ物体側へ移動している。 In the first embodiment, the first lens group L1 moves toward the object side as shown by the arrow when zooming from the wide-angle end to the telephoto end. The second lens group L2 moves toward the image side while increasing the distance from the first lens group L1. The third lens group L3 moves toward the object while keeping the distance from the second lens group L2 small. The fourth lens group L4 moves toward the object while increasing the distance from the third lens group L3. The fifth lens group L5 moves toward the object while increasing the distance from the fourth lens group L4. The aperture diaphragm SP moves toward the object while keeping the distance from the third lens group L3 small.
図３の実施例２のレンズ断面図においてＬ１は正の屈折力の第１レンズ群、Ｌ２は負の屈折力の第２レンズ群、Ｌ３は正の屈折力の第３レンズ群、Ｌ４は負の屈折力の第４レンズ群、Ｌ５は正の屈折力の第５レンズ群、Ｌ６は負の屈折力の第６レンズ群である。第３レンズ群Ｌ３乃至第６レンズ群Ｌ６は正の屈折力の後群ＬＢを構成している。 In the lens sectional view of Example 2 of FIG. 3, L1 is a first lens group having a positive refractive power, L2 is a second lens group having a negative refractive power, L3 is a third lens group having a positive refractive power, and L4 is a negative lens group. The fourth lens group of the refractive power, L5 is the fifth lens group of the positive refractive power, and L6 is the sixth lens group of the negative refractive power. The third lens group L3 to the sixth lens group L6 constitute a rear group LB having a positive refractive power.
実施例２では広角端から望遠端へのズーミングに際して矢印の如く第１レンズ群Ｌ１は物体側へ移動している。第２レンズ群Ｌ２は第１レンズ群Ｌ１との間隔を大にしつつ像側へ移動している。第３レンズ群Ｌ３は第２レンズ群Ｌ２との間隔を小にしつつ物体側へ移動している。第４レンズ群Ｌ４は第３レンズ群Ｌ３との間隔を大にしつつ物体側へ移動している。第５レンズ群Ｌ５は第４レンズ群Ｌ４との間隔を大にしつつ物体側へ移動している。第６レンズ群Ｌ６は像面に対して不動である。開口絞りＳＰは第３レンズ群Ｌ３との間隔を小にしつつ物体側へ移動している。 In the second embodiment, the first lens group L1 moves to the object side as shown by the arrow when zooming from the wide-angle end to the telephoto end. The second lens group L2 moves toward the image side while increasing the distance from the first lens group L1. The third lens group L3 moves toward the object while keeping the distance from the second lens group L2 small. The fourth lens group L4 moves toward the object while increasing the distance from the third lens group L3. The fifth lens group L5 moves toward the object while increasing the distance from the fourth lens group L4. The sixth lens group L6 is immovable with respect to the image plane. The aperture diaphragm SP moves toward the object while keeping the distance from the third lens group L3 small.
図５の実施例３のレンズ断面図においてＬ１は正の屈折力の第１レンズ群、Ｌ２は負の屈折力の第２レンズ群、Ｌ３は正の屈折力の第３レンズ群、Ｌ４は負の屈折力の第４レンズ群、Ｌ５は負の屈折力の第５レンズ群である。第３レンズ群Ｌ３乃至第５レンズ群Ｌ５は正の屈折力の後群ＬＢを構成している。 In the lens sectional view of Example 3 of FIG. 5, L1 is a first lens group having a positive refractive power, L2 is a second lens group having a negative refractive power, L3 is a third lens group having a positive refractive power, and L4 is a negative lens group. The fourth lens group of the refractive power of L5 is the fifth lens group of the negative refractive power. The third lens group L3 to the fifth lens group L5 constitute a rear group LB having a positive refractive power.
実施例３では広角端から望遠端へのズーミングに際して矢印の如く第１レンズ群Ｌ１は物体側へ移動している。第２レンズ群Ｌ２は第１レンズ群Ｌ１との間隔を大にしつつ像側へ移動している。第３レンズ群Ｌ３は第２レンズ群Ｌ２との間隔を小にしつつ物体側へ移動している。第４レンズ群Ｌ４は第３レンズ群Ｌ３との間隔を大にしつつ物体側へ移動している。第５レンズ群Ｌ５は第４レンズ群Ｌ４との間隔を大にしつつ物体側へ移動している。開口絞りＳＰは第３レンズ群Ｌ３との間隔を小にしつつ物体側へ移動している。 In the third embodiment, the first lens group L1 moves to the object side as shown by the arrow when zooming from the wide-angle end to the telephoto end. The second lens group L2 moves toward the image side while increasing the distance from the first lens group L1. The third lens group L3 moves toward the object while keeping the distance from the second lens group L2 small. The fourth lens group L4 moves toward the object while increasing the distance from the third lens group L3. The fifth lens group L5 moves toward the object while increasing the distance from the fourth lens group L4. The aperture diaphragm SP moves toward the object while keeping the distance from the third lens group L3 small.
図７の実施例４のレンズ断面図においてＬ１は正の屈折力の第１レンズ群、Ｌ２は負の屈折力の第２レンズ群、Ｌ３は正の屈折力の第３レンズ群、Ｌ４は負の屈折力の第４レンズ群、Ｌ５は負の屈折力の第５レンズ群、Ｌ６は正の屈折力の第６レンズ群である。第３レンズ群Ｌ３乃至第６レンズ群Ｌ６は正の屈折力の後群ＬＢを構成している。 In the lens sectional view of Example 4 of FIG. 7, L1 is a first lens group having a positive refractive power, L2 is a second lens group having a negative refractive power, L3 is a third lens group having a positive refractive power, and L4 is a negative lens group. The fourth lens group of the refractive power, L5 is the fifth lens group of the negative refractive power, and L6 is the sixth lens group of the positive refractive power. The third lens group L3 to the sixth lens group L6 constitute a rear group LB having a positive refractive power.
実施例４では広角端から望遠端へのズーミングに際して矢印の如く第１レンズ群Ｌ１は物体側へ移動している。第２レンズ群Ｌ２は第１レンズ群Ｌ１との間隔を大にしつつ像側へ移動している。第３レンズ群Ｌ３は第２レンズ群Ｌ２との間隔を小にしつつ物体側へ移動している。第４レンズ群Ｌ４は第３レンズ群Ｌ３との間隔を大にしつつ物体側へ移動している。第５レンズ群Ｌ５は第４レンズ群Ｌ４との間隔を大にしつつ物体側へ移動している。第６レンズ群Ｌ６は像面に対して不動である。開口絞りＳＰは第３レンズ群Ｌ３との間隔を小にしつつ物体側へ移動している。 In the fourth embodiment, the first lens group L1 moves toward the object side as shown by the arrow when zooming from the wide-angle end to the telephoto end. The second lens group L2 moves toward the image side while increasing the distance from the first lens group L1. The third lens group L3 moves toward the object while keeping the distance from the second lens group L2 small. The fourth lens group L4 moves toward the object while increasing the distance from the third lens group L3. The fifth lens group L5 moves toward the object while increasing the distance from the fourth lens group L4. The sixth lens group L6 is immovable with respect to the image plane. The aperture diaphragm SP moves toward the object while keeping the distance from the third lens group L3 small.
各実施例においてフォーカシングは、第４レンズ群Ｌ４を光軸方向に移動させて行っているが、ズームレンズ全体又は任意の１つのレンズ群を移動させて行っても良い。 In each embodiment, the focusing is performed by moving the fourth lens group L4 in the optical axis direction, but the focusing may be performed by moving the entire zoom lens or any one lens group.
各実施例において、第３レンズ群Ｌ３は、光軸に対して垂直方向の成分を持つように移動して、ズームレンズ全体が振動したときの像ぶれを補正している。即ち防振を行っている。 In each embodiment, the third lens group L3 moves so as to have a component in the direction perpendicular to the optical axis to correct image blur when the entire zoom lens vibrates. That is, vibration isolation is performed.
次に本発明のズームレンズを撮像光学系として用いた実施例を図９を用いて説明する。図９において、１０は撮像装置の一例としての図、１１は本発明のズ−ムレンズによって構成された撮像光学系、１２は撮像光学系１１によって形成された被写体像を受光するＣＣＤセンサやＣＭＯＳセンサ等の固体撮像素子（光電変換素子）を示す。又、１３は撮像素子１２が受光した被写体像を記録する記録手段、１４は不図示の表示素子に表示された被写体像を観察するためのファインダ−である。上記表示素子は液晶パネル等によって構成され、撮像素子１２上に形成された披写体像が表示される。
Next, an example in which the zoom lens of the present invention is used as an imaging optical system will be described with reference to FIG. In FIG. 9, 10 is a diagram as an example of an image pickup device, 11 is an image pickup optical system configured by the zoom lens of the present invention, and 12 is a CCD sensor or CMOS sensor that receives a subject image formed by the image pickup
このように本発明のズームレンズをデジタルカメラ等の撮像装置に適用することにより、高い光学性能を有した撮像装置を実現している。尚、本発明はクイックリターンミラーのないＳＬＲ（Ｓｉｎｇｌｅ ｌｅｎｓ Ｒｅｆｌｅｘ）カメラにも同様に適用することができる。尚、本発明のズームレンズはビデオカメラにも同様に適用することができる。 By applying the zoom lens of the present invention to an imaging device such as a digital camera in this way, an imaging device having high optical performance is realized. The present invention can be similarly applied to an SLR (Single lens Reflex) camera without a quick return mirror. The zoom lens of the present invention can be similarly applied to a video camera.
次に、実施例１乃至４に対応する数値データ１乃至４を示す。数値データにおいて、ｉは物体側から数えた面の順序を示す。ｒｉはレンズ面の曲率半径、ｄｉは第ｉ面と第ｉ＋１面との間のレンズ肉厚および空気間隔、ｎｄｉ、νｄｉはそれぞれｄ線に対する第ｉ番目のレンズの材料の屈折率、アッベ数を示す。 Next, numerical data 1 to 4 corresponding to Examples 1 to 4 are shown. In the numerical data, i indicates the order of the faces counted from the object side. ri is the radius of curvature of the lens surface, di is the lens wall thickness and air spacing between the i-th plane and the i + 1-th plane, and ndi and νdi are the refractive index of the material of the i-th lens with respect to the d line and the Abbe number, respectively. show.
また非球面形状はＲを近軸曲率半径、ｋを離心率、Ａ４、Ａ６、Ａ８、Ａ１０を非球面係数、光軸からの高さｈの位置での光軸方向の変位を面頂点を基準にしてｘとするとき、
ｘ＝（ｈ２／Ｒ）／［１＋［１−（１＋ｋ）（ｈ／Ｒ）２］１／２］＋Ａ４ｈ４＋Ａ６ｈ６＋Ａ８ｈ８＋Ａ１０ｈ１０
で表示される。
For the aspherical shape, R is the paraxial radius of curvature, k is the eccentricity, A4, A6, A8, and A10 are the aspherical coefficients, and the displacement in the optical axis direction at the position of height h from the optical axis is based on the surface apex. When it is set to x
x = (h 2 / R) / [1 + [1- (1 + k) (h / R) 2 ] 1/2 ] + A4h 4 + A6h 6 + A8h 8 + A10h 10
Is displayed.
各実施例において、バックフォーカス（ＢＦ）はレンズ最終面から近軸像面までの距離である。レンズ全長は最も物体側のレンズ面から最終レンズ面までの距離にバックフォーカスを加えた値である。また、各実施例における上述した各条件式との対応を表１に示す。 In each embodiment, the back focus (BF) is the distance from the final surface of the lens to the paraxial image plane. The total length of the lens is the value obtained by adding the back focus to the distance from the lens surface on the most object side to the final lens surface. Table 1 shows the correspondence with each of the above-mentioned conditional expressions in each embodiment.
[数値データ１]
単位 mm
面データ
面番号 r d nd νd 有効径
1 343.797 1.90 1.83481 42.7 51.98
2 87.984 5.24 1.49700 81.5 51.65
3 -812.146 0.10 51.70
4 100.004 4.00 1.43875 94.9 51.89
5 1235.196 0.10 51.78
6 75.761 4.17 1.49700 81.5 51.07
7 285.400 (可変) 50.77
8 39.835 0.65 2.00100 29.1 16.56
9 8.135 4.44 12.53
10 -22.209 3.18 1.95906 17.5 12.00
11 -8.890 0.50 1.95375 32.3 11.85
12 46.968 0.10 11.57
13 19.848 4.37 1.76182 26.5 11.61
14 -12.852 0.18 11.10
15 -11.860 0.50 1.95375 32.3 10.87
16 -60.590 (可変) 10.78
17(絞り) ∞ (可変) 8.1918
18* 10.924 4.22 1.49710 81.6 8.64
19* -24.540 6.48 8.38
20 55.902 0.60 1.95375 32.3 6.80
21 7.639 3.31 1.49700 81.5 6.67
22 497.956 1.23 7.09
23 15.132 2.60 1.51742 52.4 7.52
24 -28.072 (可変) 7.50
25 -63.050 0.45 1.80400 46.6 6.97
26 6.661 2.70 1.83400 37.2 6.91
27 31.302 (可変) 6.80
28 17.352 2.35 1.72047 34.7 6.92
29 -17.073 0.45 1.91082 35.3 6.72
30 33.541 (可変) 6.65
像面 ∞
[Numerical data 1]
Unit mm
Surface data Surface number rd nd νd Effective diameter
1 343.797 1.90 1.83481 42.7 51.98
2 87.984 5.24 1.49700 81.5 51.65
3 -812.146 0.10 51.70
4 100.004 4.00 1.43875 94.9 51.89
5 1235.196 0.10 51.78
6 75.761 4.17 1.49700 81.5 51.07
7 285.400 (variable) 50.77
8 39.835 0.65 2.00100 29.1 16.56
9 8.135 4.44 12.53
10 -22.209 3.18 1.95906 17.5 12.00
11 -8.890 0.50 1.95375 32.3 11.85
12 46.968 0.10 11.57
13 19.848 4.37 1.76182 26.5 11.61
14 -12.852 0.18 11.10
15 -11.860 0.50 1.95375 32.3 10.87
16 -60.590 (variable) 10.78
17 (Aperture) ∞ (Variable) 8.1918
18 * 10.924 4.22 1.49710 81.6 8.64
19 * -24.540 6.48 8.38
20 55.902 0.60 1.95375 32.3 6.80
21 7.639 3.31 1.49700 81.5 6.67
22 497.956 1.23 7.09
23 15.132 2.60 1.51742 52.4 7.52
24-28.072 (variable) 7.50
25 -63.050 0.45 1.80400 46.6 6.97
26 6.661 2.70 1.83400 37.2 6.91
27 31.302 (variable) 6.80
28 17.352 2.35 1.72047 34.7 6.92
29 -17.073 0.45 1.91082 35.3 6.72
30 33.541 (variable) 6.65
Image plane ∞
非球面データ
第18面
K = 0.00000e+000 A 4=-1.01400e-004 A 6=-1.26876e-006 A 8= 2.85674e-009 A10=-1.76987e-010
第19面
K = 0.00000e+000 A 4= 5.37987e-005 A 6=-1.12580e-006
各種データ
ズーム比 94.24
広角 中間 望遠
焦点距離 3.69 10.56 347.74
Fナンバー 2.88 5.00 6.69
半画角（度） 41.98 20.16 0.64
像高 3.32 3.88 3.88
レンズ全長 101.29 110.40 195.00
BF 2.99 10.34 14.99
d 7 0.89 19.14 105.33
d16 33.36 6.97 0.78
d17 5.63 12.01 0.31
d24 3.21 2.38 4.86
d27 1.37 5.73 14.92
d30 2.99 10.34 14.99
レンズ群データ
群 始面 焦点距離
1 1 123.68
2 8 -7.36
3 18 17.31
4 25 -28.34
5 28 178.94
Aspherical data surface 18
K = 0.00000e + 000 A 4 = -1.01400
Page 19
K = 0.00000e + 000 A 4 = 5.37987
Various data Zoom ratio 94.24
Wide-angle medium telephoto focal length 3.69 10.56 347.74
F number 2.88 5.00 6.69
Half angle of view (degrees) 41.98 20.16 0.64
Image height 3.32 3.88 3.88
Lens overall length 101.29 110.40 195.00
BF 2.99 10.34 14.99
d 7 0.89 19.14 105.33
d16 33.36 6.97 0.78
d17 5.63 12.01 0.31
d24 3.21 2.38 4.86
d27 1.37 5.73 14.92
d30 2.99 10.34 14.99
Lens group data group Start surface focal length
1 1 123.68
2 8 -7.36
3 18 17.31
4 25 -28.34
5 28 178.94
[数値データ２]
単位 mm
面データ
面番号 r d nd νd 有効径
1 360.211 1.90 1.83481 42.7 51.98
2 90.202 5.16 1.49700 81.5 51.67
3 -785.099 0.10 51.72
4 102.095 3.98 1.43875 94.9 51.91
5 1424.570 0.10 51.80
6 77.150 4.08 1.49700 81.5 51.10
7 287.213 (可変) 50.81
8 38.718 0.65 2.00100 29.1 17.69
9 8.418 4.47 13.29
10 -26.485 2.67 1.95906 17.5 12.96
11 -10.069 0.50 1.95375 32.3 12.83
12 48.916 0.10 12.46
13 18.506 5.21 1.76182 26.5 12.47
14 -9.546 0.50 1.95375 32.3 11.86
15 -112.329 (可変) 11.64
16(絞り) ∞ (可変) 8.36
17* 11.285 3.38 1.49710 81.6 8.71
18* -26.330 7.08 8.58
19 63.199 0.60 1.95375 32.3 6.82
20 7.946 1.78 1.49700 81.5 6.71
21 498.745 2.58 6.89
22 16.452 1.68 1.51742 52.4 7.68
23 -25.329 (可変) 7.69
24 -59.283 0.45 1.80400 46.6 6.98
25 6.610 2.62 1.83400 37.2 6.94
26 31.700 (可変) 6.85
27 17.554 2.90 1.72047 34.7 6.99
28 -16.365 0.45 1.91082 35.3 6.77
29 33.999 (可変) 6.75
30 34.620 0.40 1.48749 70.2 7.81
31 26.861 1.30 7.82
像面 ∞
[Numerical data 2]
Unit mm
Surface data Surface number rd nd νd Effective diameter
1 360.211 1.90 1.83481 42.7 51.98
2 90.202 5.16 1.49700 81.5 51.67
3 -785.099 0.10 51.72
4 102.095 3.98 1.43875 94.9 51.91
5 1424.570 0.10 51.80
6 77.150 4.08 1.49700 81.5 51.10
7 287.213 (variable) 50.81
8 38.718 0.65 2.00100 29.1 17.69
9 8.418 4.47 13.29
10 -26.485 2.67 1.95906 17.5 12.96
11 -10.069 0.50 1.95375 32.3 12.83
12 48.916 0.10 12.46
13 18.506 5.21 1.76182 26.5 12.47
14 -9.546 0.50 1.95375 32.3 11.86
15 -112.329 (variable) 11.64
16 (Aperture) ∞ (Variable) 8.36
17 * 11.285 3.38 1.49710 81.6 8.71
18 * -26.330 7.08 8.58
19 63.199 0.60 1.95375 32.3 6.82
20 7.946 1.78 1.49700 81.5 6.71
21 498.745 2.58 6.89
22 16.452 1.68 1.51742 52.4 7.68
23 -25.329 (variable) 7.69
24-59.283 0.45 1.80400 46.6 6.98
25 6.610 2.62 1.83400 37.2 6.94
26 31.700 (variable) 6.85
27 17.554 2.90 1.72047 34.7 6.99
28 -16.365 0.45 1.91082 35.3 6.77
29 33.999 (variable) 6.75
30 34.620 0.40 1.48749 70.2 7.81
31 26.861 1.30 7.82
Image plane ∞
非球面データ
第17面
K = 0.00000e+000 A 4=-8.01992e-005 A 6=-1.20378e-006 A 8= 2.19514e-009 A10=-1.37429e-010
第18面
K = 0.00000e+000 A 4= 6.16236e-005 A 6=-1.10629e-006
各種データ
ズーム比 94.24
広角 中間 望遠
焦点距離 3.69 11.71 347.74
Fナンバー 2.88 5.00 6.69
半画角（度） 41.98 18.31 0.64
像高 3.32 3.88 3.88
レンズ全長 104.13 118.82 196.70
BF 1.30 1.30 1.30
d 7 0.75 26.44 106.88
d15 36.61 7.89 1.30
d16 5.77 12.60 0.30
d23 4.45 3.64 5.96
d26 1.42 6.23 15.39
d29 0.50 7.40 12.25
ズームレンズ群データ
群 始面 焦点距離
1 1 125.94
2 8 -7.79
3 17 17.91
4 24 -27.98
5 27 182.84
6 30 -250.08
17th surface of aspherical data
K = 0.00000e + 000 A 4 = -8.01992
Page 18
K = 0.00000e + 000 A 4 = 6.16236
Various data Zoom ratio 94.24
Wide-angle medium telephoto focal length 3.69 11.71 347.74
F number 2.88 5.00 6.69
Half angle of view (degrees) 41.98 18.31 0.64
Image height 3.32 3.88 3.88
Lens total length 104.13 118.82 196.70
BF 1.30 1.30 1.30
d 7 0.75 26.44 106.88
d15 36.61 7.89 1.30
d16 5.77 12.60 0.30
d23 4.45 3.64 5.96
d26 1.42 6.23 15.39
d29 0.50 7.40 12.25
Zoom lens group Data group Start surface Focal length
1 1 125.94
2 8 -7.79
3 17 17.91
4 24 -27.98
5 27 182.84
6 30 -250.08
[数値データ３]
単位 mm
面データ
面番号 r d nd νd 有効径
1 496.874 1.95 1.83481 42.7 54.60
2 87.578 6.23 1.49700 81.5 54.25
3 -405.741 0.10 54.33
4 86.814 5.08 1.43387 95.1 54.67
5 1477.517 0.10 54.53
6 74.474 4.69 1.49700 81.5 53.52
7 273.193 (可変) 53.13
8* 202.743 1.00 1.61881 63.9 21.96
9* 13.375 6.26 16.58
10 -15.558 1.41 1.59270 35.3 12.89
11 -10.960 0.70 1.65160 58.5 12.57
12 56.444 0.09 11.65
13 36.703 3.65 1.75211 25.1 11.55
14 -10.083 0.60 2.00100 29.1 11.13
15 -46.495 (可変) 11.73
16(絞り) ∞ (可変) 12.12
17* 15.041 7.06 1.61881 63.9 19.30
18* -43.054 5.41 18.89
19 64.734 0.60 2.00100 29.1 15.84
20 10.652 7.54 1.49700 81.5 14.77
21 -64.864 1.00 15.43
22 21.503 1.99 1.66680 33.0 15.78
23 100.104 (可変) 15.59
24 115.635 1.91 1.80518 25.4 14.56
25 -48.282 0.60 1.85135 40.1 14.31
26* 29.558 (可変) 13.90
27 19.583 0.60 1.91082 35.3 14.00
28 8.792 8.16 1.63980 34.5 13.20
29 -12.028 0.60 1.85135 40.1 13.00
30* 109.484 (可変) 13.23
像面 ∞
[Numerical data 3]
Unit mm
Surface data Surface number rd nd νd Effective diameter
1 496.874 1.95 1.83481 42.7 54.60
2 87.578 6.23 1.49700 81.5 54.25
3 -405.741 0.10 54.33
4 86.814 5.08 1.43387 95.1 54.67
5 1477.517 0.10 54.53
6 74.474 4.69 1.49700 81.5 53.52
7 273.193 (variable) 53.13
8 * 202.743 1.00 1.61881 63.9 21.96
9 * 13.375 6.26 16.58
10 -15.558 1.41 1.59270 35.3 12.89
11 -10.960 0.70 1.65160 58.5 12.57
12 56.444 0.09 11.65
13 36.703 3.65 1.75211 25.1 11.55
14 -10.083 0.60 2.00100 29.1 11.13
15 -46.495 (variable) 11.73
16 (Aperture) ∞ (Variable) 12.12
17 * 15.041 7.06 1.61881 63.9 19.30
18 * -43.054 5.41 18.89
19 64.734 0.60 2.00100 29.1 15.84
20 10.652 7.54 1.49700 81.5 14.77
21 -64.864 1.00 15.43
22 21.503 1.99 1.66680 33.0 15.78
23 100.104 (variable) 15.59
24 115.635 1.91 1.80518 25.4 14.56
25 -48.282 0.60 1.85135 40.1 14.31
26 * 29.558 (variable) 13.90
27 19.583 0.60 1.91082 35.3 14.00
28 8.792 8.16 1.63980 34.5 13.20
29 -12.028 0.60 1.85135 40.1 13.00
30 * 109.484 (variable) 13.23
Image plane ∞
非球面データ
第8面
K = 0.00000e+000 A 4= 1.37866e-005 A 6= 2.28356e-007 A 8=-1.26460e-009 A10= 6.06650e-012
第9面
K = 0.00000e+000 A 4=-1.31993e-005 A 6= 1.59962e-007
第17面
K = 0.00000e+000 A 4=-3.55446e-005 A 6=-7.70996e-008 A 8= 4.64465e-013 A10=-2.50852e-012
第18面
K = 0.00000e+000 A 4= 2.00653e-005 A 6=-3.04950e-008
第26面
K = 0.00000e+000 A 4=-3.53416e-006 A 6= 3.48731e-008 A 8=-3.08236e-010 A10=-1.77215e-012
第30面
K = 0.00000e+000 A 4=-6.51631e-005 A 6=-2.36081e-007 A 8=-3.22579e-009 A10= 1.29720e-011
各種データ
ズーム比 39.04
広角 中間 望遠
焦点距離 9.06 32.81 353.84
Fナンバー 2.88 5.00 6.49
半画角（度） 36.82 13.13 1.28
像高 6.79 7.65 7.89
レンズ全長 116.63 156.59 200.00
BF 4.00 18.40 11.95
d 7 1.78 39.55 87.81
d15 13.65 2.87 0.70
d16 22.05 19.00 0.30
d23 3.56 1.03 5.87
d26 4.25 8.41 26.05
d30 4.00 18.40 11.95
レンズ群データ
群 始面 焦点距離
1 1 115.16
2 8 -11.09
4 17 21.37
5 24 -44.40
6 27 -146.54
Aspherical data surface 8
K = 0.00000e + 000 A 4 = 1.37866
Side 9
K = 0.00000e + 000 A 4 = -1.31993
17th page
K = 0.00000e + 000 A 4 = -3.55446
Page 18
K = 0.00000e + 000 A 4 = 2.00653
26th page
K = 0.00000e + 000 A 4 = -3.53416
30th page
K = 0.00000e + 000 A 4 = -6.51631
Various data Zoom ratio 39.04
Wide-angle medium telephoto focal length 9.06 32.81 353.84
F number 2.88 5.00 6.49
Half angle of view (degrees) 36.82 13.13 1.28
Image height 6.79 7.65 7.89
Lens overall length 116.63 156.59 200.00
BF 4.00 18.40 11.95
d 7 1.78 39.55 87.81
d15 13.65 2.87 0.70
d16 22.05 19.00 0.30
d23 3.56 1.03 5.87
d26 4.25 8.41 26.05
d30 4.00 18.40 11.95
Lens group data group Start surface focal length
1 1 115.16
2 8 -11.09
4 17 21.37
5 24 -44.40
6 27 -146.54
[数値データ４]
単位 mm
面データ
面番号 r d nd νd 有効径
1 483.310 1.95 1.83481 42.7 54.61
2 82.593 6.46 1.49700 81.5 54.22
3 -431.920 0.10 54.32
4 89.191 4.99 1.43387 95.1 54.74
5 1745.214 0.10 54.61
6 68.659 5.25 1.49700 81.5 53.62
7 320.110 (可変) 53.25
8* -900.033 1.00 1.61881 63.9 25.48
9* 14.400 7.11 18.90
10 -18.143 1.40 1.59270 35.3 16.64
11 -14.205 0.70 1.65160 58.5 16.44
12 52.384 0.08 15.69
13 41.276 5.14 1.75211 25.1 15.66
14 -12.182 0.60 2.00100 29.1 15.27
15 -44.601 (可変) 15.29
16(絞り) ∞ (可変) 15.75
17* 20.308 5.78 1.61881 63.9 18.21
18* -51.865 7.41 18.12
19 63.106 0.60 2.00100 29.1 16.00
20 14.632 6.44 1.49700 81.5 15.43
21 -132.649 1.01 15.73
22 34.133 2.06 1.57099 50.8 15.84
23 -113.273 (可変) 15.72
24 92.152 1.42 1.74077 27.8 15.19
25 -59.618 0.60 1.85135 40.1 15.04
26* 41.286 (可変) 14.67
27 31.800 0.60 1.91082 35.3 13.72
28 8.916 10.64 1.67270 32.1 13.02
29 -9.720 0.60 1.85135 40.1 12.96
30* 105.099 (可変) 13.45
31 30.346 5.19 1.67270 32.1 15.79
32 -19.082 0.60 1.92286 18.9 15.69
33 174.720 1.16 15.88
像面 ∞
[Numerical data 4]
Unit mm
Surface data Surface number rd nd νd Effective diameter
1 483.310 1.95 1.83481 42.7 54.61
2 82.593 6.46 1.49700 81.5 54.22
3-431.920 0.10 54.32
4 89.191 4.99 1.43387 95.1 54.74
5 1745.214 0.10 54.61
6 68.659 5.25 1.49700 81.5 53.62
7 320.110 (variable) 53.25
8 * -900.033 1.00 1.61881 63.9 25.48
9 * 14.400 7.11 18.90
10 -18.143 1.40 1.59270 35.3 16.64
11 -14.205 0.70 1.65160 58.5 16.44
12 52.384 0.08 15.69
13 41.276 5.14 1.75211 25.1 15.66
14 -12.182 0.60 2.00100 29.1 15.27
15 -44.601 (variable) 15.29
16 (Aperture) ∞ (Variable) 15.75
17 * 20.308 5.78 1.61881 63.9 18.21
18 * -51.865 7.41 18.12
19 63.106 0.60 2.00100 29.1 16.00
20 14.632 6.44 1.49700 81.5 15.43
21 -132.649 1.01 15.73
22 34.133 2.06 1.57099 50.8 15.84
23 -113.273 (variable) 15.72
24 92.152 1.42 1.74077 27.8 15.19
25 -59.618 0.60 1.85135 40.1 15.04
26 * 41.286 (variable) 14.67
27 31.800 0.60 1.91082 35.3 13.72
28 8.916 10.64 1.67270 32.1 13.02
29 -9.720 0.60 1.85135 40.1 12.96
30 * 105.099 (variable) 13.45
31 30.346 5.19 1.67270 32.1 15.79
32 -19.082 0.60 1.92286 18.9 15.69
33 174.720 1.16 15.88
Image plane ∞
非球面データ
第8面
K = 0.00000e+000 A 4= 3.30836e-005 A 6=-1.08998e-007 A 8= 2.97468e-010 A10= 4.99427e-013
第9面
K = 0.00000e+000 A 4= 1.36483e-005 A 6=-3.48677e-008
第17面
K = 0.00000e+000 A 4=-1.66389e-005 A 6=-1.69780e-008 A 8=-6.55396e-011 A10= 1.32419e-013
第18面
K = 0.00000e+000 A 4= 1.01754e-005 A 6=-1.62144e-008
第26面
K = 0.00000e+000 A 4=-2.19021e-006 A 6= 9.06439e-009 A 8=-6.22324e-010 A10= 4.47339e-012
第30面
K = 0.00000e+000 A 4=-7.17992e-005 A 6=-2.39316e-007 A 8=-3.02598e-010 A10=-2.85114e-011
各種データ
ズーム比 39.04
広角 中間 望遠
焦点距離 9.06 44.96 353.84
Fナンバー 2.88 5.00 6.49
半画角（度） 37.14 9.95 1.28
像高 6.86 7.89 7.89
レンズ全長 141.87 182.91 206.96
BF 1.16 1.16 1.16
d 7 0.99 46.04 78.47
d15 25.37 5.72 0.69
d16 25.19 22.23 0.28
d23 1.16 1.06 9.87
d26 9.68 12.16 23.64
d30 0.49 16.71 15.01
d33 1.16 1.16 1.16
レンズ群データ
群 始面 焦点距離
1 1 108.93
2 8 -12.55
4 17 24.41
5 24 -70.19
6 27 -42.12
7 31 197.71
Aspherical data surface 8
K = 0.00000e + 000 A 4 = 3.30836
Side 9
K = 0.00000e + 000 A 4 = 1.36483
17th page
K = 0.00000e + 000 A 4 = -1.66389
Page 18
K = 0.00000e + 000 A 4 = 1.01754
26th page
K = 0.00000e + 000 A 4 = -2.190121
30th page
K = 0.00000e + 000 A 4 = -7.17992
Various data Zoom ratio 39.04
Wide-angle medium telephoto focal length 9.06 44.96 353.84
F number 2.88 5.00 6.49
Half angle of view (degrees) 37.14 9.95 1.28
Image height 6.86 7.89 7.89
Lens overall length 141.87 182.91 206.96
BF 1.16 1.16 1.16
d 7 0.99 46.04 78.47
d15 25.37 5.72 0.69
d16 25.19 22.23 0.28
d23 1.16 1.06 9.87
d26 9.68 12.16 23.64
d30 0.49 16.71 15.01
d33 1.16 1.16 1.16
Lens group data group Start surface focal length
1 1 108.93
2 8 -12.55
4 17 24.41
5 24 -70.19
6 27 -42.12
7 31 197.71
Ｌ１：第１レンズ群 Ｌ２：第２レンズ群 Ｌ３：第３レンズ群
Ｌ４：第４レンズ群 Ｌ５：第５レンズ群 Ｌ６：第６レンズ群
ＬＢ：後群 ＳＰ：開口絞り
L1: 1st lens group L2: 2nd lens group L3: 3rd lens group L4: 4th lens group L5: 5th lens group L6: 6th lens group LB: Rear group SP: Aperture aperture
Claims (12)
前記第２レンズ群は３枚以上の負レンズと２枚以上の正レンズを有し、前記第２レンズ群に含まれる負レンズの材料の屈折率の平均値をＮｎａ、前記第２レンズ群に含まれる正レンズの材料の屈折率の平均値をＮｐａ、望遠端における全系の焦点距離をｆｔ、前記第２レンズ群の焦点距離をｆ２、前記第１レンズ群の焦点距離をｆ１、広角端における全系の焦点距離をｆｗ、前記第２レンズ群に含まれる正レンズの焦点距離の平均値をｆｐａとするとき、
１．０＜Ｎｎａ／Ｎｐａ＜２．０
０．０１＜｜ｆ２／ｆｔ｜＜０．１０
１０．０＜ｆ１／ｆｗ＜４０．０
０．５＜｜ｆｐａ／ｆ２｜＜６．０
なる条件式を満足することを特徴とするズームレンズ。 Disposed in order from the object side to the image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, Ri by the group after a positive refractive power as a whole comprising one or more lens groups In a zoom lens that is configured, the first lens group moves to the object side during zooming from the wide-angle end to the telephoto end, and the distance between adjacent lens groups changes during zooming.
The second lens group has three or more negative lenses and two or more positive lenses, and the average value of the refractive index of the negative lens material included in the second lens group is Nna, and the second lens group is used. The average value of the refractive index of the material of the positive lens included is Npa , the focal distance of the entire system at the telephoto end is ft, the focal distance of the second lens group is f2, the focal distance of the first lens group is f1, and the wide-angle end. When the focal distance of the entire system is fw and the average value of the focal distances of the positive lenses included in the second lens group is fpa ,
1.0 <Nna / Npa <2.0
0.01 << | f2 / ft | <0.10
10.0 <f1 / fw <40.0
0.5 << | fpa / f2 | <6.0
A zoom lens characterized by satisfying the conditional expression.
なる条件式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 . 60 <Npa <1.95
The zoom lens according to claim 1, wherein the zoom lens satisfies the conditional expression.
０．０＜ｍ２／ｆｔ＜３．０
なる条件式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。 When the amount of movement of the second lens group during zooming to the telephoto end from the wide angle end and m2,
0.0 <m2 / ft <3.0
The zoom lens according to any one of claims 1 to 3, wherein the zoom lens satisfies the conditional expression.
前記後群は、物体側から像側へ順に配置された、正の屈折力の第３レンズ群、負の屈折力の第４レンズ群、負の屈折力の第５レンズ群から構成され、The rear group is composed of a third lens group having a positive refractive power, a fourth lens group having a negative refractive power, and a fifth lens group having a negative refractive power arranged in order from the object side to the image side.
前記第２レンズ群は３枚以上の負レンズと２枚以上の正レンズを有し、前記第２レンズ群に含まれる負レンズの材料の屈折率の平均値をＮｎａ、前記第２レンズ群に含まれる正レンズの材料の屈折率の平均値をＮｐａ、前記第２レンズ群に含まれる正レンズの焦点距離の平均値をｆｐａ、前記第２レンズ群の焦点距離をｆ２とするとき、The second lens group has three or more negative lenses and two or more positive lenses, and the average value of the refractive index of the negative lens material included in the second lens group is Nna, and the second lens group is used. When the average value of the refractive index of the material of the positive lens included is Npa, the average value of the focal distances of the positive lenses included in the second lens group is fpa, and the focal distance of the second lens group is f2.
１．０＜Ｎｎａ／Ｎｐａ＜２．０1.0 <Nna / Npa <2.0
０．５＜｜ｆｐａ／ｆ２｜＜６．０0.5 << | fpa / f2 | <6.0
なる条件式を満足することを特徴とするズームレンズ。A zoom lens characterized by satisfying the conditional expression.
前記後群は、物体側から像側へ順に配置された、正の屈折力の第３レンズ群、負の屈折力の第４レンズ群、負の屈折力の第５レンズ群、正の屈折力の第６レンズ群から構成され、The rear group includes a third lens group having a positive refractive power, a fourth lens group having a negative refractive power, a fifth lens group having a negative refractive power, and a positive refractive power arranged in order from the object side to the image side. Consists of the 6th lens group of
前記第２レンズ群は３枚以上の負レンズと２枚以上の正レンズを有し、前記第２レンズ群に含まれる負レンズの材料の屈折率の平均値をＮｎａ、前記第２レンズ群に含まれる正レンズの材料の屈折率の平均値をＮｐａ、前記第２レンズ群に含まれる正レンズの焦点距離の平均値をｆｐａ、前記第２レンズ群の焦点距離をｆ２とするとき、The second lens group has three or more negative lenses and two or more positive lenses, and the average value of the refractive index of the negative lens material included in the second lens group is Nna, and the second lens group is used. When the average value of the refractive index of the material of the positive lens included is Npa, the average value of the focal distances of the positive lenses included in the second lens group is fpa, and the focal distance of the second lens group is f2.
１．０＜Ｎｎａ／Ｎｐａ＜２．０1.0 <Nna / Npa <2.0
０．５＜｜ｆｐａ／ｆ２｜＜６．０0.5 << | fpa / f2 | <6.0
なる条件式を満足することを特徴とするズームレンズ。A zoom lens characterized by satisfying the conditional expression.
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| JPS63205628A (en) * | 1987-02-20 | 1988-08-25 | Canon Inc | High variable power ratio zoom lens |
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| JPH11352402A (en) * | 1998-06-10 | 1999-12-24 | Nikon Corp | Zoom lens |
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| JP5201809B2 (en) * | 2006-07-06 | 2013-06-05 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
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