JP6452405B2 - Zoom lens and imaging apparatus having the same - Google Patents
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Description
本発明はズームレンズに関するものであり、例えばデジタルスチルカメラ、ビデオカメラ、監視カメラ、放送用カメラ、銀塩フィルム用カメラ等の撮像装置に用いる撮像光学系として好適なものである。 The present invention relates to a zoom lens, and is suitable as an imaging optical system used in an imaging apparatus such as a digital still camera, a video camera, a surveillance camera, a broadcast camera, and a silver salt film camera.
近年、固体撮像素子を用いた撮像装置は、固体撮像素子が大型化し、それに伴い撮像装置が高機能化され、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明るく、広角端の画角が広く、高ズーム比で、しかも全ズーム範囲にわたり高い光学性能を有したズームレンズであること等が要求されている。これらの要求を満足するズームレンズの1つとして、物体側より像側へ順に、正、負、正、負、正の屈折力の第1レンズ群乃至第5レンズ群よりなる5群ズームレンズが知られている(特許文献1,2)。 In recent years, an image pickup apparatus using a solid-state image pickup element has a large solid-state image pickup element, and accordingly, the function of the image pickup apparatus has been enhanced, and the entire apparatus has been downsized. As an imaging optical system used therefor, there is a demand for a zoom lens having a bright, wide angle of view at the wide-angle end, a high zoom ratio, and high optical performance over the entire zoom range. As one of the zoom lenses that satisfy these requirements, there is a five-unit zoom lens including first to fifth lens units having positive, negative, positive, negative, and positive refractive powers in order from the object side to the image side. Known (Patent Documents 1 and 2).
特許文献1ではズーミングに際して第1レンズ群乃至第3レンズ群、第5レンズ群が移動するズーム比10程度のズームレンズを開示している。特許文献2ではズーミングに際して各レンズ群が移動し、フォーカシングに際して第4レンズ群が移動するズーム比5程度の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 10 in which the first to third lens groups and the fifth lens group move during zooming. Patent Document 2 discloses a zoom lens having a zoom ratio of about 5 in which each lens group moves during zooming and a fourth lens group moves during focusing.
前述した屈折力配置の5群ズームレンズは全系の小型化を図りつつ、大口径比化、広画角化、高ズーム比化を図りつつ高い光学性能を得ることが比較的容易である。しかしながら大口径比化を図りつつ望遠端での焦点距離を長くし、更なる高ズーム比化を図ろうとすると球面収差、非点収差、そして色収差等の諸収差が増大してきて、高い光学性能を維持するのが難しくなってくる。特にFナンバーを小さくして、明るくしようとすると、望遠端において球面収差、コマ収差等の諸収差の発生が増大してくる。また、広画角化しようとすると、広角端において非点収差、倍率色収差等の諸収差の発生が増大すると共に前玉径が増大してくる。 The above-described five-group zoom lens having a refractive power arrangement is relatively easy to obtain high optical performance while achieving a large aperture ratio, a wide angle of view, and a high zoom ratio while reducing the size of the entire system. However, increasing the focal length at the telephoto end while increasing the aperture ratio, and further increasing the zoom ratio, increases various aberrations such as spherical aberration, astigmatism, and chromatic aberration, resulting in high optical performance. It becomes difficult to maintain. In particular, when the F-number is made small and brighter, various aberrations such as spherical aberration and coma increase at the telephoto end. Further, when attempting to widen the angle of view, the occurrence of various aberrations such as astigmatism and lateral chromatic aberration increases at the wide-angle end and the front lens diameter increases.
5群ズームレンズにおいて、全系の小型化を図りつつ、大口径比化、広画角化、高ズーム比化を図り、全ズーム範囲にわたり高い光学性能を得るには、各レンズ群の屈折力やレンズ構成を適切に設定する。そして各レンズ群のズーミングに伴う移動条件等を適切に設定することが重要となる。例えば、ズーミングの際の第1レンズ群の移動量や正の屈折力の第3レンズ群の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。これらの要素を適切に設定しないと全系の小型化を図り、大口径比、広画角かつ高ズーム比で、全ズーム範囲で高い光学性能を得るのが大変困難になってくる。 In order to obtain high optical performance over the entire zoom range by reducing the size of the entire system while achieving a large aperture ratio, a wide angle of view, and a high zoom ratio in a 5-group zoom lens, the refractive power of each lens group Set the lens configuration appropriately. It is important to appropriately set the movement conditions associated with zooming of each lens group. For example, it is important to appropriately set the amount of movement of the first lens unit during zooming and the lens configuration of the third lens unit having a positive refractive power. If these elements are not set appropriately, the entire system will be reduced in size, and it will be very difficult to obtain high optical performance over the entire zoom range with a large aperture ratio, wide angle of view and high zoom ratio.
特許文献1のズームレンズでは沈胴鏡筒を想定して第1レンズ群の移動量を軽減しているため、大口径比化、広画角化を図ろうとすると、前玉有効径が増大し、全系が大型化してくる。特許文献2のズームレンズは広角端の撮影画角が30度程度の望遠型であるため、広画角化及び高ズーム比化を図ろうとすると前玉有効径が増大し、全系が大型化してくる。 In the zoom lens of Patent Document 1, since the amount of movement of the first lens group is reduced assuming a retractable lens barrel, an attempt to increase the aperture ratio and wide angle of view increases the effective diameter of the front lens, The whole system becomes larger. Since the zoom lens of Patent Document 2 is a telephoto type whose shooting angle of view at the wide-angle end is about 30 degrees, when trying to widen the angle of view and increase the zoom ratio, the effective diameter of the front lens increases and the entire system becomes larger. Come.
本発明は、高ズーム比で全ズーム範囲にわたり高い光学性能が容易に得られる全系が小型の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 in which the entire system can be easily obtained with a high zoom ratio and high optical performance over the entire zoom range, and an image pickup apparatus having the zoom lens.
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、正の屈折力の第3レンズ群、負の屈折力の第4レンズ群、正又は負の屈折力の第5レンズ群からなり、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であって、
前記第3レンズ群は4枚以上のレンズを有し、
前記第3レンズ群において、最も像側に配置されたレンズ、像側から数えて2番目のレンズ、像側から数えて3番目のレンズの夫々は、互いに空気を隔てて配置されており、望遠端における全系の焦点距離をft、広角端における全系の焦点距離をfw、前記第4レンズ群の焦点距離をf4、広角端から望遠端へのズーミングにおける前記第1レンズ群の移動量をM1、広角端に比べて望遠端においてレンズ群が物体側に位置するときの移動量の符号を負、像側に位置するときの移動量の符号を正、前記第3レンズ群において、最も像側に配置されたレンズの物体側のレンズ面及び像側から数えて2番目のレンズの像側のレンズ面の曲率半径を各々Ro31及びRi32とするとき、
−0.8<M1/ft<−0.4
−15.00<f4/fw<−2.50
−0.08<(Ro31−Ri32)/(Ro31+Ri32)<0.05
なる条件式を満足することを特徴としている。
The zoom lens according to the present invention includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, arranged in order from the object side to the image side. A zoom lens comprising a fourth lens group having a refractive power and a fifth lens group having a positive or negative refractive power, wherein the distance between adjacent lens groups changes during zooming,
The third lens group has four or more lenses.
In the third lens group, the lens arranged closest to the image side, the second lens counted from the image side, and the third lens counted from the image side are arranged with air separated from each other. The focal length of the entire system at the end is ft, the focal length of the entire system at the wide-angle end is fw, the focal length of the fourth lens group is f4, and the amount of movement of the first lens group in zooming from the wide-angle end to the telephoto end is M1, the sign of the amount of movement when the lens group is located on the object side at the telephoto end compared to the wide-angle end is negative, the sign of the amount of movement when the lens group is located on the image side is positive, and the most image in the third lens group When the curvature radii of the lens surface on the object side of the lens arranged on the side and the lens surface on the image side of the second lens counted from the image side are Ro31 and Ri32, respectively .
−0.8 <M1 / ft <−0.4
-15.00 <f4 / fw <-2.50
−0.08 <(Ro31−Ri32) / (Ro31 + Ri32) <0.05
It satisfies the following conditional expression.
本発明によれば、大口径比、広画角で全ズーム範囲にわたり高い光学性能が容易に得られる全系が小型のズームレンズが得られる。 According to the present invention, it is possible to obtain a zoom lens having a small overall size, which can easily obtain high optical performance over a full zoom range with a large aperture ratio and a wide angle of view.
以下に、本発明の好ましい実施の形態を、添付の図面に基づいて詳細に説明する。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、正の屈折力の第3レンズ群、負の屈折力の第4レンズ群、正又は負の屈折力の第5レンズ群からなる。そして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。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The zoom lens according to the present invention includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, arranged in order from the object side to the image side. The lens unit includes a fourth lens unit having a refractive power and a fifth lens unit having a positive or negative refractive power. The distance between adjacent lens units changes during zooming.
図1は本発明での実施例1のズームレンズの広角端(短焦点距離端)におけるレンズ断面図、図2(A)、(B)、(C)はそれぞれ実施例1のズームレンズの広角端、中間のズーム位置、望遠端(長焦点距離端)における収差図である。実施例1のズームレンズはズーム比9.64、Fナンバー2.88〜5.77である。 FIG. 1 is a lens cross-sectional view at the wide-angle end (short focal length end) of the zoom lens according to Embodiment 1 of the present invention, and FIGS. 2A, 2B, and 2C are respectively the wide-angle of the zoom lens according to Embodiment 1. FIG. 6 is an aberration diagram at an end, an intermediate zoom position, and a telephoto end (long focal length end). The zoom lens of Example 1 has a zoom ratio of 9.64 and an F number of 2.88 to 5.77.
図3は本発明での実施例2のズームレンズの広角端におけるレンズ断面図、図4(A)、(B)、(C)はそれぞれ実施例2のズームレンズの広角端、中間のズーム位置、望遠端における収差図である。実施例2のズームレンズはズーム比9.56、Fナンバー2.88〜5.77である。 3 is a lens cross-sectional view at the wide-angle end of the zoom lens according to the second embodiment of the present invention. FIGS. 4A, 4B, and 4C are respectively the wide-angle end and the intermediate zoom position of the zoom lens according to the second embodiment. FIG. 6 is an aberration diagram at the telephoto end. The zoom lens of Example 2 has a zoom ratio of 9.56 and an F number of 2.88 to 5.77.
図5は本発明での実施例3のズームレンズの広角端におけるレンズ断面図、図6(A)、(B)、(C)はそれぞれ実施例3のズームレンズの広角端、中間のズーム位置、望遠端における収差図である。実施例3のズームレンズはズーム比3.80、Fナンバー2.40〜3.84である。 5 is a lens cross-sectional view at the wide-angle end of the zoom lens according to Embodiment 3 of the present invention. FIGS. 6A, 6B, and 6C are respectively the wide-angle end and intermediate zoom position of the zoom lens according to Embodiment 3. FIG. 6 is an aberration diagram at the telephoto end. The zoom lens of Example 3 has a zoom ratio of 3.80 and an F number of 2.40 to 3.84.
図7は本発明での実施例4のズームレンズの広角端におけるレンズ断面図、図8(A)、(B)、(C)はそれぞれ実施例4のズームレンズの広角端、中間のズーム位置、望遠端における収差図である。実施例4のズームレンズはズーム比3.80、Fナンバー2.88〜4.86である。 7 is a lens cross-sectional view at the wide-angle end of the zoom lens according to Embodiment 4 of the present invention. FIGS. 8A, 8B, and 8C are zoom positions at the wide-angle end and intermediate position of the zoom lens according to Embodiment 4, respectively. FIG. 6 is an aberration diagram at the telephoto end. The zoom lens of Example 4 has a zoom ratio of 3.80 and an F number of 2.88 to 4.86.
図9(A)、(B)、(C)は実施例3のズームレンズの広角端と中間のズーム位置、望遠端における光路図である。図10は本発明の撮像装置の要部概略図である。 FIGS. 9A, 9B, and 9C are optical path diagrams at the wide-angle end and the intermediate zoom position and the telephoto end of the zoom lens according to the third exemplary embodiment. FIG. 10 is a schematic view of the main part of the imaging 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、監視用カメラ、TV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、L1は正の屈折力(光学的パワー=焦点距離の逆数)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は正又は負の屈折力の第5レンズ群である。 The zoom lens of each embodiment is an imaging optical system used in an imaging apparatus such as a video camera, a digital camera, a surveillance camera, and a TV camera. In the lens cross-sectional view, 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, L1 is a first lens group having a positive refractive power (optical power = reciprocal of focal length), L2 is a second lens group having a negative refractive power, and L3 is a third lens group having a positive refractive power. , L4 is a fourth lens group having a negative refractive power, and L5 is a fifth lens group having a positive or negative refractive power.
実施例1、2、4は第5レンズ群L5の屈折力は正である。実施例3は第5レンズ群L5の屈折力は負である。各実施例のレンズ断面図において、SPは解放Fナンバーの光束を決定する開口絞りであり、第3レンズ群L3の物体側又は第3レンズ群L3中に位置している。Pは光学フィルター、フェースプレート等に相当する光学ブロックである。Iは像面であり、ビデオカメラやデジタルカメラの撮像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)の撮像面に相当し、銀塩フィルム用カメラの撮像光学系として使用する際にはフィルム面に相当する。 In Examples 1, 2, and 4, the refractive power of the fifth lens unit L5 is positive. In Example 3, the refractive power of the fifth lens unit L5 is negative. In the lens cross-sectional views of the respective embodiments, SP is an aperture stop that determines the light flux of the open F number, and is located on the object side of the third lens unit L3 or in the third lens unit L3. P is an optical block corresponding to an optical filter, a face plate, or the like. I denotes an image plane, which corresponds to an imaging plane of a solid-state imaging device (photoelectric conversion device) such as a CCD sensor or a CMOS sensor when used as an imaging optical system of a video camera or a digital camera. When used as an imaging optical system, it corresponds to a film surface.
収差図において、FnoはFナンバー、ωは半画角(度)である。球面収差において、dはd線(実線)、gはg線(点線)を表示し、非点収差において、ΔMはd線におけるメリジオナル像面、ΔSはサジタル像面ΔSを表示し、歪曲収差においてはd線を表示し、倍率色収差においてはd線に対するg線の収差を表示している。 In the aberration diagrams, Fno is the F number, and ω is the half angle of view (degrees). In spherical aberration, d represents the d line (solid line), g represents the g line (dotted line), astigmatism, ΔM represents the meridional image plane at the d line, ΔS represents the sagittal image plane ΔS, and distortion aberration Indicates the d-line, and the chromatic aberration of magnification indicates the aberration of the g-line with respect to the d-line.
レンズ断面図において矢印は広角端から望遠端へのズーミングに際しての各レンズ群と無限遠物体から近距離物体へのフォーカシングをするときの移動方向を示している。尚、以下の各実施例において広角端と望遠端は変倍レンズ群が機構上光軸上移動可能な範囲の両端に位置したときのズーム位置をいう。 In the lens cross-sectional view, the arrows indicate the moving directions when focusing from an infinitely distant object to a close object during zooming from the wide-angle end to the telephoto end. In each of the following embodiments, the wide-angle end and the telephoto end are zoom positions when the variable power lens unit is positioned at both ends of the range in which the zoom lens unit can be moved on the optical axis due to the mechanism.
実施例1、2では、ズーミングに際して矢印のように、第1レンズ群L1乃至第4レンズ群L4が移動する。第5レンズ群L5は不動である。実施例3、4ではズーミングに際して矢印のように第1レンズ群L1乃至第5レンズ群L5が移動する。 In the first and second embodiments, the first lens unit L1 to the fourth lens unit L4 move as indicated by arrows during zooming. The fifth lens unit L5 is stationary. In Examples 3 and 4, the first lens unit L1 to the fifth lens unit L5 move as indicated by arrows during zooming.
実施例1乃至実施例4では、第4レンズ群L4を光軸上、移動させてフォーカシングを行うリアフォーカス式を採用している。第4レンズ群L4に関する実線の曲線4aと点線の曲線4bは、各々無限遠物体と近距離物体にフォーカスしているときの変倍に伴う像面変動を補正するための移動軌跡である。また、望遠端において無限遠物体から近距離物体へフォーカスを行う場合には、矢印4cに示すように第4レンズ群L4を像側に繰り込むことで行っている。 In the first to fourth embodiments, a rear focus type is employed in which focusing is performed by moving the fourth lens unit L4 on the optical axis. A solid curve 4a and a dotted curve 4b relating to the fourth lens unit L4 are movement trajectories for correcting image plane fluctuations accompanying zooming when focusing on an object at infinity and an object at close distance, respectively. Further, when focusing from an infinitely distant object to a close object at the telephoto end, the fourth lens unit L4 is retracted to the image side as indicated by an arrow 4c.
本発明のズームレンズでは、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、正の屈折力の第3レンズ群、負の屈折力の第4レンズ群、正又は負の屈折力の第5レンズ群より構成されている。このような構成により、全系の小型化と高ズーム比を達成している。 In the zoom lens of the present invention, in order from the object side to the image side, the first lens group having a positive refractive power, the second lens group having a negative refractive power, the third lens group having a positive refractive power, and a negative lens having a negative refractive power. The fourth lens group includes a fifth lens group having positive or negative refractive power. With this configuration, the entire system is downsized and a high zoom ratio is achieved.
ズーミングに際し各レンズ群の間隔を変化させている。ズーミングに際して、第1レンズ群L1を不動にすると、第2レンズ群L2以降のレンズ群の移動が規制されてしまう。その結果、第1レンズ群の正の屈折力を強くして、第1レンズ群L1と第2レンズ群L2の間隔変化で主に変倍を行なう事になる。一方で、第1レンズ群L1の正の屈折力が強い場合、少ない構成レンズ枚数では望遠端において軸上色収差と球面収差の補正が困難になる。 The distance between the lens groups is changed during zooming. If the first lens unit L1 is not moved during zooming, movement of the lens units after the second lens unit L2 is restricted. As a result, the positive refracting power of the first lens group is strengthened, and magnification is mainly changed by changing the distance between the first lens group L1 and the second lens group L2. On the other hand, when the positive refractive power of the first lens unit L1 is strong, it is difficult to correct axial chromatic aberration and spherical aberration at the telephoto end with a small number of constituent lenses.
そこで、本発明ではズーミングに際し第1レンズ群L1を移動させる事により、第1レンズ群L1と同じ正の屈折力を有する第3レンズ群L3に正の屈折力を分担している。そして第1レンズ群L1と第2レンズ群L2の間隔変化と、第2レンズ群L2と第3レンズ群L3の間隔変化の両方で効率的に変倍を行なっている。また、全系の小型化の為には全体的に各レンズ群の屈折力を強くするのが効果的であるが、収差補正の為に構成レンズ枚数が増加してくる。特に、有効径が大きいレンズ群では大きさや質量が増大してくる。 Therefore, in the present invention, by moving the first lens unit L1 during zooming, the positive refractive power is shared by the third lens unit L3 having the same positive refractive power as that of the first lens unit L1. The zooming is efficiently performed by both the change in the distance between the first lens unit L1 and the second lens unit L2 and the change in the interval between the second lens unit L2 and the third lens unit L3. Further, in order to reduce the size of the entire system, it is effective to increase the refractive power of each lens group as a whole, but the number of constituent lenses increases to correct aberrations. In particular, in a lens group having a large effective diameter, the size and mass increase.
そこで本発明では、レンズ有効径が比較的小さい第3レンズ群L3の構成レンズ枚数を4枚以上とし、大きさや質量の増大を抑制しながら諸収差の補正を良好に行なっている。そして第3レンズ群L3の像側の3枚のレンズは互いに空気を挟んで配置している。即ち第3レンズ群L3の中で、最も像側に配置されたレンズ、像側から数えて2番目に配置されたレンズ、像側から数えて3番目に配置されたレンズは互いに空気間隔を隔てて配置されて第3レンズ群L3中の像側に位置するレンズでは像面湾曲の補正を行なう。 Therefore, in the present invention, the number of constituent lenses of the third lens unit L3 having a relatively small effective lens diameter is set to four or more, and various aberrations are favorably corrected while suppressing an increase in size and mass. The three lenses on the image side of the third lens unit L3 are arranged with air interposed therebetween. That is, in the third lens unit L3, the lens arranged closest to the image side, the lens arranged second from the image side, and the lens arranged third from the image side are spaced apart from each other by an air space. And the lens located on the image side in the third lens unit L3 corrects curvature of field.
それと共に、第3レンズ群L3中の物体側に位置するレンズで補正が十分でなかった球面収差を補正している。より少ない構成レンズ枚数で良好に収差を補正する為にも第3レンズ群L3中の像側から3枚のレンズは空気を挟んで配し、収差を補正するレンズ面の数を増やしている。また、第3レンズ群L3中の物体側に位置するレンズは製造誤差で球面収差が増加し易いが、第3レンズ群L3中の像側から3枚の空気間隔を調整する事で球面収差の補正を容易にしている。 At the same time, spherical aberration that was not sufficiently corrected by the lens located on the object side in the third lens unit L3 is corrected. In order to correct aberrations satisfactorily with a smaller number of constituent lenses, the three lenses from the image side in the third lens unit L3 are arranged with air in between, and the number of lens surfaces for correcting aberrations is increased. Further, although the lens located on the object side in the third lens unit L3 tends to increase in spherical aberration due to a manufacturing error, the spherical aberration can be reduced by adjusting the three air intervals from the image side in the third lens unit L3. It makes correction easy.
第3レンズ群L3の像側から数えた2枚のレンズは物体側から像側へ順に、正レンズ、負レンズ、または、物体側から像側へ順に負レンズ、正レンズより構成している。第3レンズ群L3で軸外光線の入射高さが高くなる像側から1枚目のレンズまたは2枚目のレンズには負レンズを配して倍率色収差を補正している。但し、第3レンズ群L3で像側に負の屈折力のレンズを配置すると、第3レンズ群L3の物体側で正の屈折力が強くなり球面収差やコマ収差が増大してくる。 The two lenses counted from the image side of the third lens unit L3 are composed of a positive lens and a negative lens in order from the object side to the image side, or a negative lens and a positive lens in order from the object side to the image side. In the third lens unit L3, a negative lens is arranged on the first lens or the second lens from the image side where the incident height of the off-axis light beam is increased to correct the lateral chromatic aberration. However, when a lens having a negative refractive power is disposed on the image side in the third lens unit L3, the positive refractive power is increased on the object side of the third lens unit L3, and spherical aberration and coma aberration increase.
そこで本発明では、第3レンズ群L3の像側の2枚のレンズは正レンズと負レンズとし、第3レンズ群L3で物体側に正の屈折力が寄るのを抑制している。 Therefore, in the present invention, the two lenses on the image side of the third lens unit L3 are a positive lens and a negative lens, and the third lens unit L3 prevents the positive refractive power from shifting toward the object side.
図9の光路図における各光線は、実施例3を例としてとったときの軸上光束と最軸外光束を表している。光束を示す各線は光束の最周辺の光線と光束中心の光線である。図9から、本発明のズームレンズでは第3レンズ群L3に入射する軸上光束はズーム全域で太く、第3レンズ群L3中の物体側のレンズは球面収差やコマ収差の補正に大きく寄与するのが分かる。 Each light ray in the optical path diagram of FIG. 9 represents an on-axis light beam and an off-axis light beam when Example 3 is taken as an example. Each line indicating the luminous flux is the outermost ray of the luminous flux and the central ray of the luminous flux. From FIG. 9, in the zoom lens of the present invention, the axial light beam incident on the third lens unit L3 is thick throughout the zoom range, and the lens on the object side in the third lens unit L3 greatly contributes to correction of spherical aberration and coma. I understand.
その為、第3レンズ群L3中で像側に負の屈折力のレンズを配置して第3レンズ群L3中の物体側で正の屈折力が強くなると、球面収差やコマ収差の補正が困難となる。また、第3レンズ群L3から像側に行く程、軸上光束と軸外光束が分離されて軸外光束の光線の入射高さが高くなる為、倍率色収差への寄与率が上がるのが分かる。 Therefore, if a lens having a negative refractive power is disposed on the image side in the third lens unit L3 and the positive refractive power is increased on the object side in the third lens unit L3, it is difficult to correct spherical aberration and coma aberration. It becomes. It can also be seen that as the distance from the third lens unit L3 toward the image side, the axial light beam and the off-axis light beam are separated and the incident height of the off-axis light beam increases, so that the contribution ratio to the lateral chromatic aberration increases. .
本発明のズームレンズでは前述の如く構成して、第3レンズ群L3中の負の屈折力が像側に配置されるのを抑制しながら倍率色収差を良好に補正している。また第3レンズ群L3中の像側から数えた2番目のレンズと3番目のレンズを空気を挟んで離して倍率色収差を有効に補正している。 The zoom lens according to the present invention is configured as described above, and corrects the lateral chromatic aberration well while suppressing the negative refractive power in the third lens unit L3 from being arranged on the image side. Further, the second lens and the third lens counted from the image side in the third lens unit L3 are separated with air interposed therebetween to effectively correct the lateral chromatic aberration.
以上の理由により、本発明のズームレンズは、第3レンズ群L3は4枚以上のレンズからなり、第3レンズ群L3の像側の3枚のレンズは互いに空気間隔をあけて配置している。そして望遠端における全系の焦点距離をftとする。広角端から望遠端へのズーミングにおける第1レンズ群L1の移動量をM1(移動量の符号は広角端に比べて望遠端においてレンズ群が物体側に位置するときを負、像側に位置するときを正とする。)とする。このとき、
−0.8<M1/ft<−0.4 ・・・(1)
なる条件式を満足するようにしている。
For the above reasons, in the zoom lens according to the present invention, the third lens unit L3 includes four or more lenses, and the three lenses on the image side of the third lens unit L3 are arranged with an air gap therebetween. . Let ft be the focal length of the entire system at the telephoto end. The amount of movement of the first lens unit L1 during zooming from the wide-angle end to the telephoto end is M1 (the sign of the amount of movement is negative when the lens unit is located on the object side at the telephoto end compared to the wide-angle end, and located on the image side) Time is positive.) At this time,
−0.8 <M1 / ft <−0.4 (1)
The following conditional expression is satisfied.
次に前述の条件式の技術的意味について説明する。条件式(1)は望遠端における全系の焦点距離と広角端から望遠端までのズーミングに際しての第1レンズ群L1の移動量の比を規定する。条件式(1)の上限値を超えると、高ズーム比を保つ為に第1レンズ群L1の正の屈折力が強くなり、望遠端において軸上色収差と球面収差の補正が困難になる。もしくは第2レンズ群L2と第3レンズ群L3との間隔が広がり、広角端の入射瞳位置が長くなり、広画角化を図ったとき前玉有効径が増大してくる。 Next, the technical meaning of the above conditional expression will be described. Conditional expression (1) defines the ratio of the focal length of the entire system at the telephoto end to the amount of movement of the first lens unit L1 during zooming from the wide-angle end to the telephoto end. When the upper limit of conditional expression (1) is exceeded, the positive refractive power of the first lens unit L1 becomes strong in order to maintain a high zoom ratio, and it becomes difficult to correct axial chromatic aberration and spherical aberration at the telephoto end. Or the space | interval of the 2nd lens group L2 and the 3rd lens group L3 spreads, the entrance pupil position of a wide angle end becomes long, and when aiming at a wide angle of view, the front lens effective diameter increases.
逆に下限値を超えると、望遠端においてレンズ全長(第1レンズ面から最終レンズ面までの距離に空気換算のバックフォーカスを加えた値)が長くなり好ましくない。もしくは、広角端において第2レンズ群L2と第3レンズ群L3との間隔を短くしながら所望の画角を得る為に、第1レンズ群L1の正の屈折力に対する第2レンズ群L2の負の屈折力が強くなり、広角端において像面湾曲や倍率色収差の補正が困難となる。 On the other hand, if the lower limit is exceeded, the total lens length (the value obtained by adding a back focus in terms of air to the distance from the first lens surface to the final lens surface) at the telephoto end is undesirably long. Alternatively, in order to obtain a desired angle of view while shortening the distance between the second lens unit L2 and the third lens unit L3 at the wide-angle end, the second lens unit L2 is negative with respect to the positive refractive power of the first lens unit L1. This increases the refractive power, making it difficult to correct curvature of field and lateral chromatic aberration at the wide-angle end.
本発明のズームレンズにおいて更に好ましくは次の条件式のうち1つ以上を満足するのが良い。第2レンズ群L2の焦点距離をf2とする。第3レンズ群L3の焦点距離をf3とする。第4レンズ群L4の焦点距離をf4とする。第3レンズ群L3の最も像側に配置されたレンズの物体側のレンズ面と第3レンズ群L3の中で像側から数えて2番目に配置されたレンズの像側のレンズ面の曲率半径を各々Ro31、Ri32とする。広角端における全系の焦点距離をfwとする。 In the zoom lens according to the present invention, it is more preferable to satisfy one or more of the following conditional expressions. Let the focal length of the second lens unit L2 be f2. Let the focal length of the third lens unit L3 be f3. Let the focal length of the fourth lens unit L4 be f4. The radius of curvature of the lens surface on the object side of the lens arranged closest to the image side of the third lens unit L3 and the lens surface on the image side of the lens arranged second from the image side in the third lens unit L3 Are Ro31 and Ri32. Let fw be the focal length of the entire system at the wide-angle end.
このとき、次の条件式のうち1つを満足するのが良い。
−0.08<(Ro31−Ri32)/(Ro31+Ri32)<0.05・・・(2)
−1.9<f3/f2<−1.2 ・・・(3)
1.5<f3/fw<2.3 ・・・(4)
−1.5<f2/fw<−0.9 ・・・(5)
−15.00<f4/fw<−2.50 ・・・(6)
次に前述の各条件式の技術的意味について説明する。
At this time, it is preferable to satisfy one of the following conditional expressions.
−0.08 <(Ro31−Ri32) / (Ro31 + Ri32) <0.05 (2)
-1.9 <f3 / f2 <-1.2 (3)
1.5 <f3 / fw <2.3 (4)
-1.5 <f2 / fw <-0.9 (5)
-15.00 <f4 / fw <-2.50 (6)
Next, the technical meaning of each conditional expression will be described.
条件式(2)は第3レンズ群中の像側から1枚目のレンズと2枚目のレンズと間の空気のシェイプファクター(空気レンズ)を規定している。条件式(2)の上限値を超えた場合、又は下限値も越えた場合、空気レンズの屈折力が強くなる為、第3レンズ群L3中の像側から1枚目のレンズと2枚目のレンズ間の空気間隔の変化による球面収差の変化が大きくなる。この結果、製造誤差で低下した球面収差の調整がし難くなる。 Conditional expression (2) defines an air shape factor (air lens) between the first lens and the second lens from the image side in the third lens group. When the upper limit value of conditional expression (2) is exceeded or when the lower limit value is exceeded, the refractive power of the air lens increases, so the first lens and the second lens from the image side in the third lens unit L3. The change in spherical aberration due to the change in the air spacing between the lenses increases. As a result, it becomes difficult to adjust the spherical aberration that has been reduced due to manufacturing errors.
条件式(3)は第2レンズ群L2の焦点距離と第3レンズ群L3の焦点距離の比を規定する。条件式(3)の上限を超えると、ズーム全域で主に球面収差の補正が困難となる。逆に下限値を超えると、広角端において非点収差の補正が困難となる。 Conditional expression (3) defines the ratio between the focal length of the second lens unit L2 and the focal length of the third lens unit L3. If the upper limit of conditional expression (3) is exceeded, it will be difficult to correct spherical aberration mainly in the entire zoom range. Conversely, when the lower limit is exceeded, it is difficult to correct astigmatism at the wide-angle end.
条件式(4)は第3レンズ群L3の焦点距離と広角端における全系の焦点距離の比を規定する。条件式(4)の上限値を超えると、ズーミングに際して第3レンズ群L3の移動量が大きくなり、レンズ全長が増加してくる。逆に下限値を超えると、ズーム全域で主に球面収差を良好に補正するのが困難となる。 Conditional expression (4) defines the ratio between the focal length of the third lens unit L3 and the focal length of the entire system at the wide-angle end. When the upper limit of conditional expression (4) is exceeded, the amount of movement of the third lens unit L3 increases during zooming, and the total lens length increases. Conversely, if the lower limit is exceeded, it will be difficult to satisfactorily correct mainly spherical aberration over the entire zoom range.
条件式(5)は第2レンズ群L2の焦点距離と広角端における全系の焦点距離の比を規定する。条件式(5)の上限値を超えると、広角端において非点収差の補正が困難となる。逆に下限値を超えると、広角端において撮影画角を広くする為に第2レンズ群L2と第3レンズ群L3との間隔が広がり易く、入射瞳が長くなり、第1レンズ群L1と第2レンズ群L2の有効径が大きくなってくる。 Conditional expression (5) defines the ratio of the focal length of the second lens unit L2 to the focal length of the entire system at the wide angle end. If the upper limit of conditional expression (5) is exceeded, it will be difficult to correct astigmatism at the wide-angle end. On the contrary, if the lower limit is exceeded, the distance between the second lens unit L2 and the third lens unit L3 tends to increase in order to widen the shooting angle of view at the wide angle end, the entrance pupil becomes longer, and the first lens unit L1 and the first lens unit L1. The effective diameter of the two lens unit L2 increases.
条件式(6)は第4レンズ群L4の焦点距離と広角端における全系の焦点距離の比を規定する。条件式(6)の上限値を超えると、望遠側において歪曲収差が増大し、この収差の補正が困難となる。逆に下限値を超えると、変倍に伴う像面変動の補正の為に第4レンズ群L4が移動する量が大きくなりレンズ全長が増大してくる。 Conditional expression (6) defines the ratio of the focal length of the fourth lens unit L4 to the focal length of the entire system at the wide angle end. If the upper limit of conditional expression (6) is exceeded, distortion will increase on the telephoto side, and correction of this aberration will be difficult. On the other hand, when the lower limit is exceeded, the amount by which the fourth lens unit L4 moves to correct the image plane variation accompanying zooming increases and the total lens length increases.
なお、条件式(1)乃至(6)の数値範囲は以下の如く特定するのが更に望ましい。
−0.73<M1/ft<−0.4 ・・・(1a)
−0.040<(Ro31−Ri32)/(Ro31+Ri32)<0.045
・・・(2a)
−1.90<f3/f2<−1.24 ・・・(3a)
1.62<f3/fw<2.06 ・・・(4a)
−1.38<f2/fw<−1.00 ・・・(5a)
−14.60<f4/fw<−2.67 ・・・(6a)
It is more desirable to specify the numerical ranges of conditional expressions (1) to (6) as follows.
−0.73 <M1 / ft <−0.4 (1a)
−0.040 <(Ro31−Ri32) / (Ro31 + Ri32) <0.045
... (2a)
-1.90 <f3 / f2 <−1.24 (3a)
1.62 <f3 / fw <2.06 (4a)
-1.38 <f2 / fw <-1.00 (5a)
-14.60 <f4 / fw <-2.67 (6a)
本発明のズームレンズにおいて第4レンズ群L4と第5レンズ群L4はいずれも2枚以下のレンズより構成する事が望ましい。第4レンズ群L4より像側のレンズ群の有効径は第3レンズ群L3の有効径より大きくなり易く、構成レンズ枚数が増加し、質量が増大してくる。また第4レンズ群L4と第5レンズ群L5は第2レンズ群L2に比べズーミングに際しての収差変動への寄与率が小さい。このため2枚以下のレンズでも収差補正を良好に行なう事が容易となる。また、本発明のズームレンズにおいて、第1レンズ群L1は4枚以下のレンズより構成する事が望ましい。 In the zoom lens of the present invention, it is desirable that both the fourth lens unit L4 and the fifth lens unit L4 are composed of two or less lenses. The effective diameter of the lens group on the image side with respect to the fourth lens group L4 tends to be larger than the effective diameter of the third lens group L3, the number of constituent lenses increases, and the mass increases. Further, the fourth lens unit L4 and the fifth lens unit L5 have a smaller contribution ratio to the aberration variation during zooming than the second lens unit L2. Therefore, it is easy to satisfactorily correct aberrations even with two or less lenses. In the zoom lens of the present invention, it is desirable that the first lens unit L1 is composed of four or less lenses.
第1レンズ群L1は諸収差の補正において重要であるが、最も有効径が大きなレンズ群である。この為、明るいレンズでも4枚以下に抑えないと、全系の小型化が困難となる。また、本発明のズームレンズにおいて、第3レンズ群L3の最も像側に配置されたレンズと、像側から数えて2番目に配置されたレンズを光軸に対して垂直方向の成分を持つ方向に移動させて手振れ補正(像ぶれ補正)をするのが望ましい。 The first lens unit L1 is important in correcting various aberrations, but is the lens unit having the largest effective diameter. For this reason, it is difficult to reduce the size of the entire system unless the bright lens is limited to four or less. In the zoom lens according to the present invention, the lens disposed closest to the image side of the third lens unit L3 and the lens disposed second from the image side have a component perpendicular to the optical axis. It is preferable to move the lens to the position and perform camera shake correction (image blur correction).
手持ちでも高画質な撮影結果を得る為には手振れ補正を行なうのが望ましいが、撮像素子が大きいカメラではレンズ系全体も大きくなり、手振れ補正用のレンズが重くなってしまう。第3レンズ群L3の有効径は小さくなり易く、また、第3レンズ群L3の像側の2枚のレンズは正レンズと負レンズからなっている。このため手振れ補正時の偏芯による倍率色収差の変化が抑制できる最少構成のレンズ枚数としている。また、本発明のズームレンズにおいてフォーカシングに際して第4レンズ群L4が移動する。 Although it is desirable to perform camera shake correction in order to obtain a high-quality shooting result even if it is held by hand, the camera system with a large image sensor increases the overall lens system, and the camera shake correction lens becomes heavy. The effective diameter of the third lens unit L3 tends to be small, and the two lenses on the image side of the third lens unit L3 are composed of a positive lens and a negative lens. For this reason, the minimum number of lenses that can suppress a change in lateral chromatic aberration due to eccentricity during camera shake correction is set. In the zoom lens of the present invention, the fourth lens unit L4 moves during focusing.
本発明のズームレンズではフォーカシングの為だけに移動するレンズ群は設けず、変倍時の像面移動を補正するレンズ群と兼ねて、機構を簡略化している。また、フォーカシングに際して撮影画角の変化が小さい方が好ましく、本発明のズームレンズでは、変倍作用が小さい第3レンズ群L3より像側に配されるレンズ群でフォーカスを行なうのが良い。フォーカスレンズ群の軽量化も考えれば、第3レンズ群L3に近いと有効径が小さくなり易い為、第4レンズ群L4でフォーカスを行なうのが望ましい。 In the zoom lens according to the present invention, a lens group that moves only for focusing is not provided, and the mechanism is simplified by also serving as a lens group that corrects image plane movement during zooming. Further, it is preferable that the change of the shooting angle of view is small at the time of focusing. In the zoom lens of the present invention, it is preferable to perform focusing with a lens group disposed on the image side from the third lens group L3 having a small zooming action. Considering weight reduction of the focus lens group, the effective diameter tends to be small near the third lens group L3. Therefore, it is desirable to perform focusing with the fourth lens group L4.
また、製造誤差で第3レンズ群L3中の物体側に位置するレンズの球面収差が増大し、第3レンズ群L3中の像側から3枚のレンズの空気間隔を調整する事で球面収差の補正した場合、焦点位置が変化する。そこで、球面収差に影響が小さい第4レンズ群L4で焦点位置を合わせており、これにより焦点位置調整後も球面収差を良好に保っている。 In addition, the spherical aberration of the lens located on the object side in the third lens unit L3 increases due to a manufacturing error, and the spherical aberration is reduced by adjusting the air spacing of the three lenses from the image side in the third lens unit L3. When corrected, the focal position changes. Therefore, the focal position is adjusted by the fourth lens unit L4 having a small influence on the spherical aberration, so that the spherical aberration is kept good even after the focal position is adjusted.
次に本発明のズームレンズを撮像光学系として用いたデジタルスチルカメラの実施例を図10を用いて説明する。図10において、10はカメラ本体、11は実施例1〜4で説明したいずれか1つのズームレンズによって構成された撮像光学系である。12はカメラ本体に内蔵され、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)である。 Next, an embodiment of a digital still camera using the zoom lens of the present invention as an imaging optical system will be described with reference to FIG. In FIG. 10, reference numeral 10 denotes a camera body, and 11 denotes an imaging optical system configured by any one zoom lens described in the first to fourth embodiments. Reference numeral 12 denotes a solid-state imaging device (photoelectric conversion device) such as a CCD sensor or a CMOS sensor that receives a subject image formed by the imaging optical system 11 and is built in the camera body.
13は固体撮像素子12によって光電変換された被写体像に対応する情報を記録するメモリである。14は液晶ディスプレイパネル等によって構成され、固体撮像素子12上に形成された被写体像を観察するためのファインダである。 Reference numeral 13 denotes a memory for recording information corresponding to the subject image photoelectrically converted by the solid-state imaging device 12. Reference numeral 14 denotes a finder for observing a subject image formed on the solid-state imaging device 12, which includes a liquid crystal display panel or the like.
本発明のズームレンズを撮像光学系として用いたビデオカメラ(撮像装置)にも同様に適用することができる。このように本発明のズームレンズをデジタルスチルカメラやビデオカメラ等の撮像装置に適用することにより、小型で高い光学性能を有する撮像装置を実現している。なお、撮像素子にCCD等の電子撮像素子を用いれば、電子的に収差補正をする事で出力画像を更に高画質化する事ができる。 The present invention can be similarly applied to a video camera (imaging apparatus) using the zoom lens of the present invention as an imaging optical system. Thus, by applying the zoom lens of the present invention to an imaging apparatus such as a digital still camera or a video camera, an imaging apparatus having a small size and high optical performance is realized. If an electronic image sensor such as a CCD is used as the image sensor, the output image can be further improved in image quality by electronically correcting aberrations.
以下に本発明の各実施例に対応する数値実施例を示す。各数値実施例においてiは物体側からの光学面の順序を示す。riは第i番目の光学面の曲率半径、diは第i番目の面間隔、ndiとνdiはそれぞれd線に対する第i番目の光学部材の材料の屈折率とアッベ数を示す。バックフォーカス(BF)は、最終レンズ面から近軸像面までの空気換算での距離である。レンズ全長は、第1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(BF)を加えた値である。 Numerical examples corresponding to the respective embodiments of the present invention will be shown below. In each numerical example, i indicates the order of the optical surfaces from the object side. ri is the radius of curvature of the i-th optical surface, di is the i-th surface interval, and ndi and νdi are the refractive index and Abbe number of the material of the i-th optical member with respect to the d line, respectively. The back focus (BF) is a distance in terms of air from the final lens surface to the paraxial image surface. The total lens length is a value obtained by adding back focus (BF) to the distance from the first lens surface to the final lens surface.
数値実施例において最後の2つの面はフィルター、フェースプレート等の光学ブロックの面である。またKを離心率、A4、A6、A8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、非球面形状は、 In the numerical example, the last two surfaces are surfaces of an optical block such as a filter and a face plate. Further, when K is an eccentricity, A4, A6, and A8 are aspherical coefficients, and the displacement in the optical axis direction at the position of the height H from the optical axis is x with respect to the surface vertex, the aspherical shape is
[数値実施例1]
単位 mm
面データ
面番号 r d nd νd
1 60.515 1.40 1.90366 31.3
2 33.620 4.81 1.59522 67.7
3 213.334 0.17
4 39.550 3.95 1.59522 67.7
5 344.053 (可変)
6 428.645 0.80 1.88300 40.8
7 9.873 4.70
8 -27.499 0.70 1.62299 58.2
9 37.697 0.39
10 19.346 2.11 1.95906 17.5
11 91.549 0.65 1.83481 42.7
12 42.465 (可変)
13* 9.580 2.37 1.69350 53.2
14* 493.816 1.49
15 27.070 0.70 1.85478 24.8
16 8.227 0.55
17 14.036 1.17 1.91082 35.3
18 31.141 2.86
19(絞り) ∞ 5.99
20* 21.347 2.70 1.58313 59.4
21 -13.971 0.20
22 -14.044 0.60 1.69895 30.1
23 -43.495 (可変)
24 -27.858 0.60 1.49700 81.5
25 67.925 (可変)
26 15.819 3.66 1.49700 81.5
27 112.668 3.09
28 ∞ 2.39 1.51633 64.1
29 ∞ 1.00
像面 ∞
[Numerical Example 1]
Unit mm
Surface data surface number rd nd νd
1 60.515 1.40 1.90366 31.3
2 33.620 4.81 1.59522 67.7
3 213.334 0.17
4 39.550 3.95 1.59522 67.7
5 344.053 (variable)
6 428.645 0.80 1.88300 40.8
7 9.873 4.70
8 -27.499 0.70 1.62299 58.2
9 37.697 0.39
10 19.346 2.11 1.95906 17.5
11 91.549 0.65 1.83481 42.7
12 42.465 (variable)
13 * 9.580 2.37 1.69350 53.2
14 * 493.816 1.49
15 27.070 0.70 1.85478 24.8
16 8.227 0.55
17 14.036 1.17 1.91082 35.3
18 31.141 2.86
19 (Aperture) ∞ 5.99
20 * 21.347 2.70 1.58313 59.4
21 -13.971 0.20
22 -14.044 0.60 1.69895 30.1
23 -43.495 (variable)
24 -27.858 0.60 1.49700 81.5
25 67.925 (variable)
26 15.819 3.66 1.49700 81.5
27 112.668 3.09
28 ∞ 2.39 1.51633 64.1
29 ∞ 1.00
Image plane ∞
非球面データ
第13面
K =-3.80870e-001 A 4=-1.93618e-005
第14面
K = 3.79865e+003 A 4= 7.61748e-006
第20面
K =-4.63980e+000 A 4= 3.70395e-005
各種データ
ズーム比 9.64
広角 中間 望遠
焦点距離 9.17 35.39 88.38
Fナンバー 2.88 4.95 5.77
半画角(度) 41.5 12.6 5.05
像高 6.68 8.00 8.00
レンズ全長 76.89 97.29 113.20
BF 5.66 5.66 5.66
d 5 0.65 18.71 33.11
d12 20.00 5.24 0.32
d23 4.57 11.69 11.79
d25 3.43 13.41 19.73
ズームレンズ群データ
群 始面 焦点距離
1 1 61.90
2 6 -9.80
3 13 18.01
4 24 -39.67
5 26 36.57
6 28 ∞
Aspherical data 13th surface
K = -3.80870e-001 A 4 = -1.93618e-005
14th page
K = 3.79865e + 003 A 4 = 7.61748e-006
20th page
K = -4.63980e + 000 A 4 = 3.70395e-005
Various data Zoom ratio 9.64
Wide angle Medium telephoto focal length 9.17 35.39 88.38
F number 2.88 4.95 5.77
Half angle of view (degrees) 41.5 12.6 5.05
Image height 6.68 8.00 8.00
Total lens length 76.89 97.29 113.20
BF 5.66 5.66 5.66
d 5 0.65 18.71 33.11
d12 20.00 5.24 0.32
d23 4.57 11.69 11.79
d25 3.43 13.41 19.73
Zoom lens group data group Start surface Focal length
1 1 61.90
2 6 -9.80
3 13 18.01
4 24 -39.67
5 26 36.57
6 28 ∞
[数値実施例2]
単位 mm
面データ
面番号 r d nd νd
1 57.406 1.38 1.90366 31.3
2 34.849 4.71 1.49700 81.5
3 337.524 0.17
4 38.962 3.96 1.59522 67.7
5 347.617 (可変)
6 25449.906 0.79 1.83481 42.7
7 9.857 4.70
8 -25.748 0.60 1.59522 67.7
9 27.610 0.17
10 18.412 1.80 1.95906 17.5
11 52.779 (可変)
12* 13.033 1.96 1.76802 49.2
13* -602.983 0.42
14 8.828 2.16 1.49700 81.5
15 39.399 0.72 1.69895 30.1
16 7.024 3.38
17(絞り) ∞ 5.44
18* 19.947 2.55 1.58313 59.4
19 -14.028 0.17
20 -13.916 0.60 2.00100 29.1
21 -24.185 (可変)
22 -25.187 0.61 1.49700 81.5
23 153.490 (可変)
24 16.153 3.56 1.49700 81.5
25 127.840 2.60
26 ∞ 2.93 1.51633 64.1
27 ∞ 1.00
像面 ∞
[Numerical Example 2]
Unit mm
Surface data surface number rd nd νd
1 57.406 1.38 1.90366 31.3
2 34.849 4.71 1.49700 81.5
3 337.524 0.17
4 38.962 3.96 1.59522 67.7
5 347.617 (variable)
6 25449.906 0.79 1.83481 42.7
7 9.857 4.70
8 -25.748 0.60 1.59522 67.7
9 27.610 0.17
10 18.412 1.80 1.95906 17.5
11 52.779 (variable)
12 * 13.033 1.96 1.76802 49.2
13 * -602.983 0.42
14 8.828 2.16 1.49700 81.5
15 39.399 0.72 1.69895 30.1
16 7.024 3.38
17 (Aperture) ∞ 5.44
18 * 19.947 2.55 1.58313 59.4
19 -14.028 0.17
20 -13.916 0.60 2.00 100 29.1
21 -24.185 (variable)
22 -25.187 0.61 1.49700 81.5
23 153.490 (variable)
24 16.153 3.56 1.49700 81.5
25 127.840 2.60
26 ∞ 2.93 1.51633 64.1
27 ∞ 1.00
Image plane ∞
非球面データ
第12面
K =-8.50368e-001 A 4= 1.36385e-005
第13面
K =-1.00382e+004 A 4= 4.51561e-006
第18面
K =-3.72187e+000 A 4= 4.33347e-005
各種データ
ズーム比 9.56
広角 中間 望遠
焦点距離 9.47 36.56 90.54
Fナンバー 2.88 4.86 5.77
半画角(度) 40.5 12.2 4.94
像高 6.72 8.00 8.00
レンズ全長 74.29 95.50 110.83
BF 5.53 5.53 5.53
d 5 0.88 19.91 33.41
d11 19.84 5.65 0.35
d21 4.48 10.71 11.23
d23 3.71 13.87 20.47
ズームレンズ群データ
群 始面 焦点距離
1 1 62.23
2 6 -10.05
3 12 17.77
4 22 -43.49
5 24 36.81
6 26 ∞
Aspheric data 12th surface
K = -8.50368e-001 A 4 = 1.36385e-005
Side 13
K = -1.00382e + 004 A 4 = 4.51561e-006
18th page
K = -3.72187e + 000 A 4 = 4.33347e-005
Various data Zoom ratio 9.56
Wide angle Medium telephoto focal length 9.47 36.56 90.54
F number 2.88 4.86 5.77
Half angle of view (degrees) 40.5 12.2 4.94
Image height 6.72 8.00 8.00
Total lens length 74.29 95.50 110.83
BF 5.53 5.53 5.53
d 5 0.88 19.91 33.41
d11 19.84 5.65 0.35
d21 4.48 10.71 11.23
d23 3.71 13.87 20.47
Zoom lens group data group Start surface Focal length
1 1 62.23
2 6 -10.05
3 12 17.77
4 22 -43.49
5 24 36.81
6 26 ∞
[数値実施例3]
単位 mm
面データ
面番号 r d nd νd
1 61.699 1.29 2.00069 25.5
2 48.638 2.22 1.49700 81.5
3 115.615 0.17
4 39.550 3.44 1.49700 81.5
5 345.681 (可変)
6 -530.324 0.80 2.00330 28.3
7 12.541 4.90
8 -28.125 0.68 1.53775 74.7
9 41.668 0.29
10 25.897 2.27 1.95906 17.5
11 -1354.956 (可変)
12(絞り) ∞ 2.55
13* 14.421 2.60 1.88300 40.8
14* 124.769 3.35
15 37.704 0.60 1.84666 23.8
16 10.974 0.30
17 13.112 2.88 1.56907 71.3
18 -24.623 0.17
19 -56.698 0.75 1.54814 45.8
20 17.421 0.81
21* 73.621 1.49 1.88300 40.8
22 71.695 1.51
23 16.259 3.32 1.56907 71.3
24 -12.559 0.34
25 -11.758 0.75 1.78590 44.2
26 -29.598 (可変)
27 679.067 0.60 1.75700 47.8
28 21.577 1.59
29 46.498 1.37 1.90366 31.3
30 -141.491 (可変)
31 -174.010 0.58 1.69895 30.1
32 711.809 (可変)
33 ∞ 3.80 1.51633 64.1
34 ∞ 1.00
像面 ∞
[Numerical Example 3]
Unit mm
Surface data surface number rd nd νd
1 61.699 1.29 2.00069 25.5
2 48.638 2.22 1.49700 81.5
3 115.615 0.17
4 39.550 3.44 1.49700 81.5
5 345.681 (variable)
6 -530.324 0.80 2.00330 28.3
7 12.541 4.90
8 -28.125 0.68 1.53775 74.7
9 41.668 0.29
10 25.897 2.27 1.95906 17.5
11 -1354.956 (variable)
12 (Aperture) ∞ 2.55
13 * 14.421 2.60 1.88300 40.8
14 * 124.769 3.35
15 37.704 0.60 1.84666 23.8
16 10.974 0.30
17 13.112 2.88 1.56907 71.3
18 -24.623 0.17
19 -56.698 0.75 1.54814 45.8
20 17.421 0.81
21 * 73.621 1.49 1.88300 40.8
22 71.695 1.51
23 16.259 3.32 1.56907 71.3
24 -12.559 0.34
25 -11.758 0.75 1.78590 44.2
26 -29.598 (variable)
27 679.067 0.60 1.75700 47.8
28 21.577 1.59
29 46.498 1.37 1.90366 31.3
30 -141.491 (variable)
31 -174.010 0.58 1.69895 30.1
32 711.809 (variable)
33 ∞ 3.80 1.51633 64.1
34 ∞ 1.00
Image plane ∞
非球面データ
第13面
K = 3.97031e-001 A 4=-2.96707e-005 A 6= 7.00951e-008 A 8=-2.29304e-009
第14面
K = 1.63357e+001 A 4= 2.62704e-005 A 6= 2.77825e-007 A 8=-2.52376e-009
第21面
K =-7.55889e+001 A 4= 2.32380e-006 A 6= 2.61899e-007 A 8=-6.88004e-009
各種データ
ズーム比 3.80
広角 中間 望遠
焦点距離 10.31 22.74 39.16
Fナンバー 2.40 3.33 3.84
半画角(度) 38.9 19.8 11.5
像高 6.80 8.00 8.00
レンズ全長 79.06 82.15 96.51
BF 6.52 10.89 19.45
d 5 0.85 12.05 26.34
d11 23.17 7.01 2.53
d26 1.82 2.64 1.82
d30 5.08 7.94 4.74
d32 3.01 7.39 15.95
ズームレンズ群データ
群 始面 焦点距離
1 1 78.66
2 6 -14.03
3 12 17.96
4 27 -149.42
5 31 -200.00
6 33 ∞
Aspherical data 13th surface
K = 3.97031e-001 A 4 = -2.96707e-005 A 6 = 7.00951e-008 A 8 = -2.29304e-009
14th page
K = 1.63357e + 001 A 4 = 2.62704e-005 A 6 = 2.77825e-007 A 8 = -2.52376e-009
21st page
K = -7.55889e + 001 A 4 = 2.32380e-006 A 6 = 2.61899e-007 A 8 = -6.88004e-009
Various data Zoom ratio 3.80
Wide angle Medium Tele focal length 10.31 22.74 39.16
F number 2.40 3.33 3.84
Half angle of view (degrees) 38.9 19.8 11.5
Image height 6.80 8.00 8.00
Total lens length 79.06 82.15 96.51
BF 6.52 10.89 19.45
d 5 0.85 12.05 26.34
d11 23.17 7.01 2.53
d26 1.82 2.64 1.82
d30 5.08 7.94 4.74
d32 3.01 7.39 15.95
Zoom lens group data group Start surface Focal length
1 1 78.66
2 6 -14.03
3 12 17.96
4 27 -149.42
5 31 -200.00
6 33 ∞
[数値実施例4]
単位 mm
面データ
面番号 r d nd νd
1 58.520 1.38 1.95906 17.5
2 49.486 2.26 1.49700 81.5
3 106.201 0.17
4 40.287 4.14 1.45600 90.3
5 -2204.520 (可変)
6 -385.783 0.72 1.95375 32.3
7 11.428 5.05
8 -24.555 0.62 1.59282 68.6
9 33.755 0.18
10 24.025 2.00 1.95906 17.5
11 1298.567 (可変)
12(絞り) ∞ 2.55
13* 14.471 2.28 1.88300 40.8
14* 168.057 2.98
15 25.340 0.75 1.92286 20.9
16 11.049 0.63
17 14.154 2.21 1.56907 71.3
18 -20.386 0.28
19 -71.292 0.75 1.54814 45.8
20 22.603 1.00
21* 101.998 1.47 1.74100 52.6
22 83.394 1.97
23 25.039 0.75 1.72000 50.2
24 13.723 1.43
25 14.865 2.30 1.59282 68.6
26 -140.605 (可変)
27 -51.718 0.75 1.60323 42.5
28 30.730 0.52
29 76.990 0.98 2.00100 29.1
30 239.026 (可変)
31 15.854 3.45 1.49700 81.5
32 64.949 (可変)
33 ∞ 3.80 1.51633 64.1
34 ∞ 1.00
像面 ∞
[Numerical Example 4]
Unit mm
Surface data surface number rd nd νd
1 58.520 1.38 1.95906 17.5
2 49.486 2.26 1.49700 81.5
3 106.201 0.17
4 40.287 4.14 1.45600 90.3
5 -2204.520 (variable)
6 -385.783 0.72 1.95375 32.3
7 11.428 5.05
8 -24.555 0.62 1.59282 68.6
9 33.755 0.18
10 24.025 2.00 1.95906 17.5
11 1298.567 (variable)
12 (Aperture) ∞ 2.55
13 * 14.471 2.28 1.88300 40.8
14 * 168.057 2.98
15 25.340 0.75 1.92286 20.9
16 11.049 0.63
17 14.154 2.21 1.56907 71.3
18 -20.386 0.28
19 -71.292 0.75 1.54814 45.8
20 22.603 1.00
21 * 101.998 1.47 1.74 100 52.6
22 83.394 1.97
23 25.039 0.75 1.72000 50.2
24 13.723 1.43
25 14.865 2.30 1.59282 68.6
26 -140.605 (variable)
27 -51.718 0.75 1.60323 42.5
28 30.730 0.52
29 76.990 0.98 2.00 100 29.1
30 239.026 (variable)
31 15.854 3.45 1.49700 81.5
32 64.949 (variable)
33 ∞ 3.80 1.51633 64.1
34 ∞ 1.00
Image plane ∞
非球面データ
第13面
K =-4.49467e-001 A 4= 6.36803e-006 A 6=-9.68889e-008 A 8=-5.42751e-009
第14面
K = 4.92473e+002 A 4= 3.10116e-005 A 6=-3.11498e-007 A 8=-8.48583e-009
第21面
K = 2.38764e+000 A 4=-3.00330e-005 A 6= 2.04655e-007 A 8=-8.87921e-009
各種データ
ズーム比 3.80
広角 中間 望遠
焦点距離 10.19 29.64 38.73
Fナンバー 2.88 4.35 4.86
半画角(度) 39.6 15.5 11.7
像高 6.80 8.00 8.00
レンズ全長 77.00 94.15 101.38
BF 7.83 9.46 8.63
d 5 1.50 18.66 23.15
d11 18.41 4.78 3.24
d26 2.85 8.27 8.82
d30 2.83 9.40 13.96
d32 4.33 5.96 5.12
ズームレンズ群データ
群 始面 焦点距離
1 1 72.26
2 6 -11.41
3 12 18.07
4 27 -44.58
5 31 41.24
6 33 ∞
Aspherical data 13th surface
K = -4.49467e-001 A 4 = 6.36803e-006 A 6 = -9.68889e-008 A 8 = -5.42751e-009
14th page
K = 4.92473e + 002 A 4 = 3.10116e-005 A 6 = -3.11498e-007 A 8 = -8.48583e-009
21st page
K = 2.38764e + 000 A 4 = -3.00330e-005 A 6 = 2.04655e-007 A 8 = -8.87921e-009
Various data Zoom ratio 3.80
Wide angle Medium Telephoto focal length 10.19 29.64 38.73
F number 2.88 4.35 4.86
Half angle of view (degrees) 39.6 15.5 11.7
Image height 6.80 8.00 8.00
Total lens length 77.00 94.15 101.38
BF 7.83 9.46 8.63
d 5 1.50 18.66 23.15
d11 18.41 4.78 3.24
d26 2.85 8.27 8.82
d30 2.83 9.40 13.96
d32 4.33 5.96 5.12
Zoom lens group data group Start surface Focal length
1 1 72.26
2 6 -11.41
3 12 18.07
4 27 -44.58
5 31 41.24
6 33 ∞
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 SP 絞り
P フィルター類 I 像面
L1 1st lens group L2 2nd lens group L3 3rd lens group L4 4th lens group L5 5th lens group SP Aperture P Filters I Image surface
Claims (9)
前記第3レンズ群は4枚以上のレンズを有し、
前記第3レンズ群において、最も像側に配置されたレンズ、像側から数えて2番目のレンズ、像側から数えて3番目のレンズの夫々は、互いに空気を隔てて配置されており、
望遠端における全系の焦点距離をft、広角端における全系の焦点距離をfw、前記第4レンズ群の焦点距離をf4、広角端から望遠端へのズーミングにおける前記第1レンズ群の移動量をM1、広角端に比べて望遠端においてレンズ群が物体側に位置するときの移動量の符号を負、像側に位置するときの移動量の符号を正、前記第3レンズ群において、最も像側に配置されたレンズの物体側のレンズ面及び像側から数えて2番目のレンズの像側のレンズ面の曲率半径を各々Ro31及びRi32とするとき、
−0.8<M1/ft<−0.4
−15.00<f4/fw<−2.50
−0.08<(Ro31−Ri32)/(Ro31+Ri32)<0.05
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 first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group having a negative refractive power, which are arranged in order from the object side to the image side. A zoom lens composed of a fifth lens group having a positive or negative refractive power, wherein the interval between adjacent lens groups changes during zooming,
The third lens group has four or more lenses.
In the third lens group, the lens arranged closest to the image side, the second lens counted from the image side, and the third lens counted from the image side are arranged with air separated from each other.
The focal length of the entire system at the telephoto end is ft, the focal length of the entire system at the wide-angle end is fw, the focal length of the fourth lens group is f4, and the amount of movement of the first lens group during zooming from the wide-angle end to the telephoto end the M1, negative movement amount of the code when the lens unit is positioned on the object side at the telephoto end than at the wide-angle end, a positive movement amount of the code when located at the image side, in the third lens group, and most When the curvature radii of the lens surface on the object side of the lens arranged on the image side and the lens surface on the image side of the second lens counted from the image side are Ro31 and Ri32, respectively .
−0.8 <M1 / ft <−0.4
-15.00 <f4 / fw <-2.50
−0.08 <(Ro31−Ri32) / (Ro31 + Ri32) <0.05
A zoom lens satisfying the following conditional expression:
−1.9<f3/f2<−1.2
なる条件式を満足することを特徴とする請求項1または2に記載のズームレンズ。 When the focal length of the second lens group is f2, and the focal length of the third lens group is f3,
-1.9 <f3 / f2 <-1.2
The zoom lens according to claim 1 or 2, characterized by satisfying the conditional expression.
1.5<f3/fw<2.3
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 focal length of the third lens group is f3,
1.5 <f3 / fw <2.3
The zoom lens according to any one of claims 1 to 3, characterized by satisfying the conditional expression.
−1.5<f2/fw<−0.9
なる条件式を満足することを特徴とする請求項1乃至4のいずれか1項に記載のズームレンズ。 When the focal length of the second lens group is f2,
−1.5 <f2 / fw <−0.9
The zoom lens according to any one of claims 1 to 4, characterized by satisfying the conditional expression.
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JP2014240827A JP6452405B2 (en) | 2014-11-28 | 2014-11-28 | Zoom lens and imaging apparatus having the same |
EP15003219.1A EP3026480A1 (en) | 2014-11-28 | 2015-11-11 | Zoom lens and image pickup apparatus including the same |
US14/945,929 US9880376B2 (en) | 2014-11-28 | 2015-11-19 | Zoom lens and image pickup apparatus including the same |
CN201510831576.7A CN105652423B (en) | 2014-11-28 | 2015-11-25 | Zoom lens and the camera device including zoom lens |
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