JP2020101736A - Zoom imaging optical system - Google Patents
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Abstract
Description
本発明は、デジタルカメラ、ビデオカメラ等の撮像装置に用いられる防振機能を有する変倍結像光学系に関する。 The present invention relates to a variable power imaging optical system having an image stabilizing function used in an image pickup apparatus such as a digital camera or a video camera.
従来、写真用カメラやビデオカメラ等で、変倍時に全長が固定であり、防振機能を有した変倍結像光学系が特許文献1および2に開示されている。
一般的に長い焦点距離の光学系(望遠レンズ)は、大型で、高重量のものが多く、全長の小型化が望まれている。なぜなら、フォーカシングレンズ群の重量、および径が大きくなるためであり、合焦速度の高速化や径の小型化に支障をきたしていた。 Generally, many optical systems (telephoto lenses) having a long focal length are large and heavy, and miniaturization of the entire length is desired. This is because the weight and diameter of the focusing lens group become large, which hinders high focusing speed and small diameter.
また、望遠端の画角が狭い変倍結像光学系においては、手ぶれなどの振動の影響による撮影画像のぶれが発生しやすいため、光学系の一部のレンズ群(防振レンズ群)を光軸に対して垂直方向に変位させることにより撮影画像のぶれを補正する防振機能を有することが要求されている。さらに、変倍結像光学系において防振機能を有する場合には、防振レンズ群を駆動するためのアクチュエータの大型化を避けるため、防振レンズ群は径が小さく、重量が軽いことが要求される。 Also, in a variable-magnification imaging optical system with a narrow angle of view at the telephoto end, blurring of the shot image is likely to occur due to the effects of vibration such as camera shake, so some lens groups (anti-vibration lens groups) in the optical system It is required to have an anti-vibration function for correcting the blur of a captured image by displacing it in the direction perpendicular to the optical axis. Further, when the variable magnification imaging optical system has an image stabilizing function, it is required that the image stabilizing lens group has a small diameter and a small weight in order to avoid an increase in size of an actuator for driving the image stabilizing lens group. To be done.
加えて、望遠系では、変倍時に重量バランスが変わることは、撮影時の不具合になるため、可能な限り全長固定型であることが望まれている。従来の全長固定型の変倍結像光学系では、光学系の小型化を図るためには、各レンズ群の屈折力を強めることが考えられる。特に変倍をメインに司る第2レンズ群は、その屈折力により変倍移動量が増減するため、全長の小型化を左右する。しかし小型化のために屈折力を高めると、製造誤差敏感度の悪化を伴うため、屈折力を高めた状態で、実際の製品の光学性能を担保するには、高い加工精度、組み立て調整が必要となり製造コストが上昇する課題が残る。 In addition, in the telephoto system, changing the weight balance during zooming causes a problem during shooting, so it is desired that the length be fixed as much as possible. In the conventional fixed-length variable-magnification imaging optical system, it is conceivable to increase the refractive power of each lens group in order to downsize the optical system. In particular, the second lens group, which mainly controls zooming, increases or decreases the amount of zooming movement due to the refractive power of the second lens group. However, if the refracting power is increased for downsizing, the sensitivity to manufacturing error is deteriorated.Therefore, high processing accuracy and assembly adjustment are required to secure the optical performance of the actual product with the refracting power increased. Therefore, there remains a problem that the manufacturing cost increases.
また、近年では、デジタルスチルカメラを用いた動画撮影が一般的になっている。動画撮影において、被写体に対する合焦状態を維持するために、フォーカスレンズ群を光軸方向に常に微小振動(ウオブリング)させ続けることによりコントラストの変化を常時検出してフォーカスレンズ群の移動方向を決定する方法が多く採用されている。ウオブリングによりフォーカスレンズ群を駆動する場合、フォーカスレンズ群の重量が大きいとフォーカスレンズ群を駆動するためのアクチュエータが大型化し、撮影レンズの小型化・軽量化が困難となってしまう。また、アクチュエータを大型化させずに重量の大きいフォーカスレンズ群を無理にウオブリング駆動させようとすると、アクチュエータから発生する駆動音雑音が動画撮影において音声として記録されてしまうため問題となる。したがって、動画撮影に適応する変倍結像光学系はフォーカスレンズ群の軽量化が要求されている。 In recent years, moving image shooting using a digital still camera has become common. In moving image shooting, the focus lens group is constantly vibrated (wobbling) in the optical axis direction in order to maintain the in-focus state with respect to the subject, thereby constantly detecting a change in contrast and determining the moving direction of the focus lens group. Many methods have been adopted. When the focus lens group is driven by the wobbling, if the weight of the focus lens group is large, the actuator for driving the focus lens group becomes large, and it becomes difficult to reduce the size and weight of the taking lens. In addition, if the focus lens group having a large weight is forcibly driven by the wobbling drive without increasing the size of the actuator, driving sound noise generated from the actuator is recorded as sound in moving image shooting, which causes a problem. Therefore, it is required to reduce the weight of the focus lens group in the variable-magnification imaging optical system adapted for shooting moving images.
さらに、このようなフォーカス方式では、ウオブリング時の像高変化率が大きいと、鑑賞者が画面に映る被写体の倍率変動を認識して目障りに感じてしまう問題がある。そのためウオブリング時の像高変化率が小さいフォーカス方式が望まれている。 Further, in such a focus method, if the rate of change in image height at the time of wobbling is large, there is a problem that the viewer recognizes the variation in magnification of the subject on the screen and feels uncomfortable. Therefore, a focus method is desired in which the rate of change in image height during wobbling is small.
特許文献1に開示された光学系は、物体側から順に正、負、正、正の屈折力で構成され、変倍時、フォーカス時に全長固定型の変倍光学系である。また第4レンズ群内を正、負、正の3つの群に分け、中央の負レンズ群を光軸に直行方向に変位させることにより防振機能を実現している。しかしフォーカス方式が、最も口径が大きな第1レンズ群内部を移動させるインナーフォーカス構成としているため、合焦速度の高速化や径の小型化に支障をきたしている。また広角端でのフォーカス時の像高変化率が大きいという課題を有している。さらに変倍を主に司る第2レンズ群の屈折力が高いため、第2レンズ群の残存収差が大きく、製造誤差敏感度が高いという課題を有している。
The optical system disclosed in
特許文献2に開示された光学系は、物体側から順に正、負、正、正の屈折力で構成され、変倍時、フォーカス時に全長固定型の変倍光学系である。また第4レンズ群内は正の屈折力を持つ第1部分群、負の屈折力を持つ第2部分群、正または負の屈折力を持つ第3部分群に分かれ、第2部分群はフォーカス群であり、無限遠物体から近距離物体へのフォーカス時に像方向へ移動する。さらに第3部分群の最も物体側に、光軸に対して垂直方向に移動することで光学系が振動した際の像のぶれを補正する、正の屈折力の像ぶれ補正レンズ群を有している。フォーカス群に前記第4レンズ群内の第2部分群である負群を用いているため、特にテレ側の至近時の歪曲収差が正方向に悪化するという課題を有している。また変倍を主に司る第2レンズ群の屈折力が高いため、第2レンズ群の残存収差が大きく、製造誤差敏感度が高いという課題を有している。
The optical system disclosed in
本発明は上記問題点に鑑みてなされたものであり、変倍時、フォーカス時に全長固定型であり、製造誤差敏感度を抑え、ウオブリング時の像高変化率が少なく、変倍時、フォーカス時全域にわたり、良好な光学性能を備え、防振機能を有し、防振レンズ群及びフォーカスレンズ群の重量を抑制した、変倍結像光学系を提供することを目的とする。 The present invention has been made in view of the above problems, and is a fixed length type during zooming and focusing, suppressing manufacturing error sensitivity, reducing the image height change rate during wobbling, and zooming and focusing. An object of the present invention is to provide a variable power imaging optical system that has good optical performance over the entire area, has a vibration isolation function, and suppresses the weight of the vibration isolation lens group and the focus lens group.
上記課題を解決するための第1の発明は、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、正の屈折力の第4レンズ群、負の屈折力の第5レンズ群とからなり、変倍時に、前記第1レンズ群と第5レンズ群とが像面に対し固定であり、無限遠物体から近距離物体へのフォーカシングに際して、前記第4レンズ群が光軸に沿って物体側に移動することを特徴とする変倍結像光学系とした。 A first aspect of the invention for solving the above-mentioned problems is, in order from the object side to the image side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a positive refractive power. , A fourth lens unit having a positive refracting power and a fifth lens unit having a negative refracting power, and at the time of zooming, the first lens unit and the fifth lens unit are fixed with respect to the image plane, and at infinity. In the variable power imaging optical system, the fourth lens group moves toward the object side along the optical axis during focusing from the object to the short-distance object.
また、第2の発明は、前記第2レンズ群は、物体側から像側へ順に、物体側に凸の負の単レンズからなる第2aレンズ群と負の屈折力の第2bレンズ群から構成され、前記第2aレンズ群と前記第2bレンズ群の空気間隔が前記第2レンズ群を構成する空気間隔の内、最も大きくなり、前記第2aレンズ群の焦点距離と前記第2レンズ群の焦点距離が以下の条件式を満足することを特徴とする第1の発明に記載の変倍結像光学系とした。
(1)0.35<G2at/G2t<0.80
(2)1.40<G2af/G2f<4.40
ただし
G2t:第2レンズ群の合成厚
G2at:第2aレンズ群と第2bレンズ群に挟まれた空気間隔
G2f:第2レンズ群の焦点距離
G2af:第2aレンズ群の焦点距離
In a second aspect of the present invention, the second lens group includes, in order from the object side to the image side, a second lens group consisting of a negative single lens convex to the object side and a second lens group having a negative refractive power. The air distance between the 2a lens group and the 2b lens group is the largest among the air distances that form the second lens group, and the focal length of the 2a lens group and the focal point of the 2nd lens group are The variable power imaging optical system according to the first invention is characterized in that the distance satisfies the following conditional expression.
(1) 0.35<G2at/G2t<0.80
(2) 1.40<G2af/G2f<4.40
However, G2t: combined thickness of the second lens group G2at: air gap between the 2a lens group and the 2b lens group G2f: focal length of the 2nd lens group G2af: focal length of the 2a lens group
また、第3の発明は、前記第4レンズ群は、無限遠物体から近距離物体へのフォーカシングの際、物体方向へ移動し、以下の条件式を満足することを特徴とする第1または第2の発明に記載の変倍結像光学系とした。
ただし
(3)0.19<f4/ft<0.75
(4)1.20<MR^2×(1−M4^2)<6.00
(5)0.15<M4<0.80
ft:望遠端における物体距離無限遠時の焦点距離
f4:前記第4レンズ群G4の焦点距離
M4:物体距離無限遠時の前記第4レンズ群G4の横倍率
MR:物体距離無限遠時の前記第5レンズ群G5の横倍率
The third invention is characterized in that the fourth lens group moves toward the object at the time of focusing from an object at infinity to a near object and satisfies the following conditional expression: The variable power imaging optical system described in the second aspect of the invention is used.
However, (3) 0.19<f4/ft<0.75
(4) 1.20<MR^2*(1-M4^2)<6.00
(5) 0.15<M4<0.80
ft: focal length when the object distance is infinity at the telephoto end f4: focal length of the fourth lens group G4 M4: lateral magnification of the fourth lens group G4 when the object distance is infinity MR: the object distance at infinity Lateral magnification of fifth lens group G5
また、第4の発明は、前記第5レンズ群は、以下の条件式を満足することを特徴とする第1乃至第3の発明のいずれかに記載の変倍結像光学系とした。
(6)−0.85<f5/ft<−0.15
ただし
f5:前記第5レンズ群の焦点距離
ft:望遠端における物体距離無限遠時の焦点距離
A fourth invention is the variable power imaging optical system according to any one of the first to third inventions, characterized in that the fifth lens group satisfies the following conditional expression.
(6) -0.85<f5/ft<-0.15
Here, f5: focal length of the fifth lens group ft: object distance at the telephoto end, focal length at infinity
また、第5の発明は、前記第5レンズ群は、物体側から像側へ順に、負の屈折力からなる第5aレンズ群と正の屈折力の第5bレンズ群から構成され、前記第5aレンズ群を光軸に対して垂直方向に変位させることによって防振を行うことを特徴とする第1乃至第4の発明のいずれかに記載の変倍結像光学系とした。 According to a fifth aspect of the present invention, the fifth lens group comprises, in order from the object side to the image side, a 5a lens group having negative refracting power and a 5b lens group having positive refracting power. The variable-magnification imaging optical system according to any one of the first to fourth inventions is characterized in that image stabilization is performed by displacing the lens group in a direction perpendicular to the optical axis.
また、第6の発明は、前記第2aレンズ群は、以下の条件式を満足することを特徴とする第2乃至第5の発明のいずれかに記載の変倍結像光学系とした。
(7)−7.50<(G2a2+G2a1)/(G2a2−G2a1)<−1.05
ただし
G2a1:前記第2aレンズ群の物体側の曲率半径
G2a2:前記第2aレンズ群の像側の曲率半径
A sixth aspect of the invention is the variable power imaging optical system according to any one of the second to fifth aspects, wherein the second lens group satisfies the following conditional expression.
(7) −7.50<(G2a2+G2a1)/(G2a2-G2a1)<−1.05
Where G2a1 is the radius of curvature of the second lens group on the object side G2a2 is the radius of curvature of the second lens group on the image side
本発明によれば、変倍時、フォーカス時に全長固定型であり、製造誤差敏感度を抑え、ウオブリング時の像高変化率が少なく、変倍時、フォーカス時全域にわたり、良好な光学性能を備え、防振機能を有し、防振レンズ群及びフォーカスレンズ群の重量を抑制した、変倍光学系を提供することが可能となる。 According to the present invention, the total length is fixed during zooming and focusing, the sensitivity to manufacturing error is suppressed, the rate of change in image height during wobbling is small, and good optical performance is provided throughout zooming and focusing. Thus, it becomes possible to provide a variable power optical system having an image stabilizing function and suppressing the weight of the image stabilizing lens group and the focus lens group.
本発明に係る変倍結像光学系は、図1、図14、図27、図40の各実施例のレンズ構成図に示されるとおり、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、正の屈折力の第4レンズ群、負の屈折力の第5レンズ群からなり、開口絞りは第3レンズ群内、あるいは第3レンズ群に隣接し、変倍時に、前記第1レンズ群と前記5レンズ群が像面に対し固定であり、無限遠物体から近距離物体へのフォーカシングに際して、前記第4レンズ群が光軸に沿って物体側に移動する。 The variable power imaging optical system according to the present invention, as shown in the lens configuration diagrams of the respective embodiments of FIGS. 1, 14, 27, and 40, has a positive refracting power first in order from the object side to the image side. One lens group, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a positive refractive power, and a fifth lens group having a negative refractive power. In the third lens group or adjacent to the third lens group, the first lens group and the fifth lens group are fixed with respect to the image plane during zooming, and when focusing from an object at infinity to a near object, The fourth lens group moves to the object side along the optical axis.
正の屈折力の前記第1レンズ群と負の屈折力の前記第2レンズ群は、広角端から望遠端への変倍時に、その間隔を増加させることにより変倍結像光学系の主な変倍効果を得ている。 The first lens group having a positive refractive power and the second lens group having a negative refractive power increase the distance between the wide-angle end and the telephoto end, thereby increasing the distance between them. It has a scaling effect.
正の屈折力の前記第3レンズ群は、負の屈折力の前記第2レンズ群で発散された光束を収斂光として射出し、フォーカスレンズ群に入射させる。これにより後述のフォーカス時の球面収差の変動を抑制することができる。 The third lens group having a positive refracting power emits the light flux diverged by the second lens group having a negative refracting power as convergent light and makes it enter the focus lens group. As a result, it is possible to suppress the variation of spherical aberration during focusing, which will be described later.
正の屈折力の前記第4レンズ群は、フォーカスレンズ群として機能する。また広角端から望遠端への変倍時に、像面補償作用も担っている。さらに前記第4レンズ群に収斂光が入射することにより、フォーカス時の球面収差の変動を抑えることができる。また無限遠物体から近距離物体へのフォーカシングに際して、前記第4レンズ群が光軸に沿って物体側に移動する。絞りを前記第4レンズ群の物点に見立てた場合、至近時にフォーカスする際に物点が前記第4レンズ群に近づく。これにより前記第4レンズ群に入射する主光線入射角が大きくなる。3次の歪曲収差係数は、近軸主光線入射角の3乗で大きくなる為、前記第4レンズ群自身の負の歪曲収差が増加し、これにより物体距離無限遠時の望遠端全系の正の歪曲収差は、至近時にフォーカスする際に補正される方向になる。さらに、後続するレンズ群に収斂光を入射させることにより、後続レンズ群の先頭にある防振群の径を小さくすることが可能となる。 The fourth lens group having a positive refractive power functions as a focus lens group. It also plays a role of compensating the image surface during zooming from the wide-angle end to the telephoto end. Further, by making the convergent light incident on the fourth lens group, it is possible to suppress variation in spherical aberration during focusing. When focusing from an object at infinity to a near object, the fourth lens group moves toward the object side along the optical axis. When the diaphragm is regarded as the object point of the fourth lens group, the object point approaches the fourth lens group when focusing at a close distance. This increases the incident angle of the chief ray incident on the fourth lens group. Since the third-order distortion aberration coefficient increases with the cube of the paraxial chief ray incident angle, the negative distortion aberration of the fourth lens group itself increases, which causes the entire telephoto end system at the infinite object distance. Positive distortion is in a direction to be corrected when focusing is performed at a close distance. Further, by making the convergent light incident on the subsequent lens group, it becomes possible to reduce the diameter of the image stabilizing group at the head of the subsequent lens group.
負の屈折力の前記第5レンズ群は、拡大系の倍率負担にすることにより、全系を望遠タイプにし、全長を短縮することが可能となる。さらに物体側から像側へ順に、負の屈折力からなる前記第5aレンズ群と正の屈折力の前記第5bレンズ群から構成し、前記第5aレンズ群を光軸に対して垂直方向に変位させることによって防振を行っている。 The fifth lens group having a negative refracting power makes it possible to shorten the total length by making the entire system a telephoto type by giving a magnification load to the magnifying system. Further, in order from the object side to the image side, it is composed of the 5a lens group having a negative refractive power and the 5b lens group having a positive refractive power, and the 5a lens group is displaced in the direction perpendicular to the optical axis. By doing so, it is performing anti-vibration.
また、本発明に係る変倍結像光学系は、以下に示す条件式を満足することを特徴とする。すなわち、前記第2レンズ群は、物体側から像側へ順に、物体側に凸の負の単レンズからなる前記第2aレンズ群と負の屈折力の前記第2bレンズ群から構成され、前記第2aレンズ群と前記第2bレンズ群の空気間隔が前記第2レンズ群を構成する空気間隔の内、最も大きくなり、前記第2aレンズ群の焦点距離と前記第2レンズ群の焦点距離が以下の条件式を満足することを特徴とする。
(1)0.35<G2at/G2t<0.80
(2)1.40<G2af/G2f<4.40
ただし
G2t:前記第2レンズ群の合成厚
G2at:前記第2aレンズ群と前記第2bレンズ群に挟まれた空気間隔
G2f:前記第2レンズ群の焦点距離
G2af:前記第2aレンズ群の焦点距離
The variable power imaging optical system according to the present invention is characterized by satisfying the following conditional expression. That is, the second lens group is composed of, in order from the object side to the image side, the 2a lens group consisting of a negative single lens convex to the object side and the 2b lens group having a negative refractive power, and The air distance between the 2a lens group and the second b lens group is the largest of the air distances forming the second lens group, and the focal length of the second a lens group and the focal length of the second lens group are as follows. It is characterized in that the conditional expression is satisfied.
(1) 0.35<G2at/G2t<0.80
(2) 1.40<G2af/G2f<4.40
However, G2t: combined thickness of the second lens group G2at: air gap between the second a lens group and the second b lens group G2f: focal length of the second lens group G2af: focal length of the second lens group
条件式(1)は、変倍を主に司る前記第2レンズ群の合成厚と前記第2aレンズ群と前記第2bレンズ群に挟まれた空気間隔の比について好ましい範囲を規定するものである。前記第2レンズ群は光学系全体の中で、比較的屈折力が大きく、さらに変倍時の移動が大きいため、この前記第2レンズ群の構造を規定することは、前記第2レンズ群の収差負担を減らし、製造誤差敏感度を抑えるために重要である。 Conditional expression (1) defines a preferable range for the ratio of the combined thickness of the second lens group that mainly controls zooming and the air gap sandwiched between the second-a lens group and the second-b lens group. .. Since the second lens group has a relatively large refracting power in the entire optical system and a large movement at the time of zooming, defining the structure of the second lens group is not limited to that of the second lens group. This is important for reducing the burden of aberration and suppressing the sensitivity to manufacturing errors.
この理由は概略すると以下の通りである。二つのレンズ群で構成される光学系の近軸屈折力は、第1レンズ群の屈折力をφ1、第2レンズ群の屈折力をφ2、第1レンズ群と第2レンズ群の間隔をt、全系の屈折力をφと置くと、
φ=φ1+φ2−t・φ1・φ2 参考式(1)
であるので、φ1、φ2<0の時、tを大きくすると、φは大きくなる。すなわちφを一定とすると、各レンズ群の屈折力φ1、φ2を小さくでき、収差発生量、および製造誤差感度の低減が可能となる。
The reason for this is as follows. The paraxial refracting power of an optical system composed of two lens groups is such that the refracting power of the first lens group is φ1, the refracting power of the second lens group is φ2, and the distance between the first lens group and the second lens group is t. , If the refractive power of the entire system is φ,
φ=φ1+φ2-t・φ1・φ2 Reference formula (1)
Therefore, when φ1 and φ2<0, φ increases when t is increased. That is, if φ is constant, the refracting powers φ1 and φ2 of each lens group can be reduced, and the amount of aberration generation and the sensitivity to manufacturing error can be reduced.
また、前記第2aレンズ群を物体側に凸の負の単レンズとすることにより、前記第2aレンズ群への入射角を緩和することが可能となり、収差発生量、製造誤差敏感度を減らすことが可能となる。 Further, by forming the second-a lens group as a negative single lens convex toward the object side, it becomes possible to reduce the incident angle to the second-a lens group, and reduce the amount of aberration generation and the sensitivity to manufacturing error. Is possible.
条件式(1)の上限値を超えて、相対的に前記第2aレンズ群と前記第2bレンズ群に挟まれた空気間隔が大きくなると、前記第2レンズ群の製造誤差敏感度が小さくなり、前記第2レンズ群の残存収差を減らすことが可能となり、製造しやすい光学系を達成することが可能であるが、前記第2レンズ群の合成厚が大きくなる為、コンパクト化には不利になる。 When the upper limit of conditional expression (1) is exceeded and the air gap between the second a lens group and the second b lens group becomes relatively large, the manufacturing error sensitivity of the second lens group becomes small, It is possible to reduce the residual aberration of the second lens group, and it is possible to achieve an optical system that is easy to manufacture. However, since the combined thickness of the second lens group becomes large, it is disadvantageous in making it compact. ..
一方、条件式(1)の下限値を超えて、相対的に前記第2aレンズ群と前記第2bレンズ群に挟まれた空気間隔が小さくなると、前記第2レンズ群の合成厚が小さくなる為、変倍のための前記第2レンズ群の移動スペースを少なくでき、光学系全長をコンパクト化しやすくなるが、前記第2aレンズ群、前記第2bレンズ群各々の屈折力が強まるため、前記第2レンズ群の残存収差の増加、製造誤差感度が大きくなる等の課題を解決できない。 On the other hand, if the air gap between the second-a lens group and the second-b lens group becomes relatively smaller than the lower limit of conditional expression (1), the combined thickness of the second lens group becomes small. , The moving space of the second lens group for zooming can be reduced, and the overall length of the optical system can be easily made compact. However, since the refracting power of each of the 2a lens group and the 2b lens group is strengthened, Problems such as an increase in residual aberration of the lens group and an increase in manufacturing error sensitivity cannot be solved.
なお、条件式(1)について、望ましくはその上限値を0.75に、また、下限値を0.37とすることで、前述の効果をより確実にすることができる。 It is to be noted that, with regard to the conditional expression (1), it is desirable to set the upper limit value to 0.75 and the lower limit value to 0.37, so that the above-described effect can be further ensured.
また、条件式(2)は、条件式(1)と相俟って、前記第2aレンズ群の屈折力と前記第2レンズ群の屈折力の比について好ましい範囲を規定するものであり、前記第2レンズ群の残存収差、製造誤差感度に影響する。前記第2レンズ群に入射する光線は、前記第1レンズ群が正の屈折力であるために、収斂光線となるが、前記第2レンズ群は負の屈折力を持つため、前記第2レンズ群への入射角がきつくなりやすい。本発明は前記第2レンズ群の屈折力を弱め、特に前記第2aレンズ群の屈折力を弱めることにより、前記第2aレンズ群への入射角を緩和して収差発生量、製造誤差敏感度を減らすことができた。 The conditional expression (2), together with the conditional expression (1), defines a preferable range for the ratio of the refractive power of the second-a lens group and the refractive power of the second-lens group. The residual aberration of the second lens group and the manufacturing error sensitivity are affected. The light beam that is incident on the second lens group is a convergent light beam because the first lens group has a positive refractive power, but the second lens group has a negative refractive power and therefore the second lens group has a negative refractive power. The angle of incidence on the group tends to be tight. The present invention weakens the refracting power of the second lens group, and in particular, weakens the refracting power of the 2a lens group, thereby relaxing the incident angle to the 2a lens group to reduce the amount of aberration and manufacturing error sensitivity. I was able to reduce it.
条件式(2)の上限値を超えて、前記第2aレンズ群の屈折力が相対的に弱くなると、前記第2レンズ群の屈折力を所定の値に保つには、前記第2レンズ群の製造誤差敏感度が小さくなり、前記第2レンズ群の残存収差を減らすことが可能となり、製造しやすい光学系を達成することが可能であるが、前記第2aレンズ群と前記第2bレンズ群に挟まれた空気間隔が大きくなり、前記第2レンズ群の合成厚が大きくなる為、コンパクト化には不利になる。 When the upper limit of conditional expression (2) is exceeded and the refracting power of the second lens group becomes relatively weak, in order to keep the refracting power of the second lens group at a predetermined value, Manufacturing error sensitivity is reduced, residual aberrations of the second lens group can be reduced, and an optical system that is easy to manufacture can be achieved. However, the second a lens group and the second b lens group have The distance between the sandwiched air becomes large, and the combined thickness of the second lens group becomes large, which is disadvantageous for compactness.
一方、条件式(2)の下限値を超えて、前記第2aレンズ群の屈折力が相対的に強くなると、前記第2レンズ群の残存収差が大きくなり、製造誤差感度が大きくなる課題を解決できない。あるいは前記第2レンズ群の屈折力が弱くなる場合は、変倍による前記第2レンズ群の移動量が増えるため、全長が大型化する。 On the other hand, if the lower limit of conditional expression (2) is exceeded and the refracting power of the second lens group becomes relatively strong, the residual aberration of the second lens group becomes large and the manufacturing error sensitivity becomes large. Can not. Alternatively, when the refracting power of the second lens group becomes weak, the amount of movement of the second lens group due to zooming increases, so that the overall length becomes large.
なお、条件式(2)について、望ましくはその上限値を3.67に、また、下限値を1.55とすることで、前述の効果をより確実にすることができる。 It is to be noted that, with regard to the conditional expression (2), it is desirable to set the upper limit value to 3.67 and the lower limit value to 1.55, so that the above-described effect can be further ensured.
また、前記第4レンズ群は、無限遠物体から近距離物体へのフォーカシングの際、物体方向へ移動し、以下の条件式を満足することが望ましい。
(3)0.19<f4/ft<0.75
(4)1.20<MR^2×(1−M4^2)<6.00
(5)0.15<M4<0.80
ft:望遠端における物体距離無限遠時の焦点距離
f4:前記第4レンズ群G4の焦点距離
M4:物体距離無限遠時の前記第4レンズ群G4の横倍率
MR:物体距離無限遠時の前記第5レンズ群G5の横倍率
Further, it is desirable that the fourth lens group moves toward the object at the time of focusing from an object at infinity to a near object, and satisfies the following conditional expression.
(3) 0.19<f4/ft<0.75
(4) 1.20<MR^2*(1-M4^2)<6.00
(5) 0.15<M4<0.80
ft: focal length when the object distance is infinity at the telephoto end f4: focal length of the fourth lens group G4 M4: lateral magnification of the fourth lens group G4 when the object distance is infinity MR: the object distance at infinity Lateral magnification of fifth lens group G5
条件式(3)は、フォーカスレンズ群である前記第4レンズ群の焦点距離を規定し、高速な合焦動作、光学系の小型化を実現するための条件である。 Conditional expression (3) defines the focal length of the fourth lens group, which is the focus lens group, and is a condition for realizing high-speed focusing operation and downsizing of the optical system.
条件式(3)の上限値を超えて、前記第4レンズ群G4の焦点距離f4が長くなると、フォーカスのための繰出し量が長くなり、至近に近づく能力が弱くなる。また繰り出し量を確保する空間が必要となり全長の大型化につながり好ましくない。 When the focal length f4 of the fourth lens group G4 becomes longer than the upper limit value of the conditional expression (3), the amount of extension for focusing becomes long, and the ability to approach the closest point becomes weak. In addition, a space for securing the amount of payout is required, which leads to an increase in the total length, which is not preferable.
条件式(3)の下限値を超えて、前記第4レンズ群G4の焦点距離f4が短くなると、フォーカスのための繰出し量が短くなりすぎ、正確な合焦位置でフォーカスレンズ群を停止させることが困難になる、さらにはフォーカス時の球面収差変動を抑えることが困難になる。 If the focal length f4 of the fourth lens group G4 becomes shorter than the lower limit value of the conditional expression (3), the extension amount for focusing becomes too short, and the focus lens group is stopped at an accurate focus position. Becomes difficult, and it becomes difficult to suppress the fluctuation of spherical aberration during focusing.
なお、条件式(3)について、その上限値をさらに0.63に、また、下限値をさらに0.23とすることで、前述の効果をより確実にすることができる。 In conditional expression (3), the upper limit value is further set to 0.63, and the lower limit value is further set to 0.23, whereby the above-described effect can be further ensured.
条件式(4)は、AF時に合焦範囲内にフォーカスレンズ群である第4レンズ群G4を駆動制御するため、前記第4レンズ群G4、および、前記第4レンズ群G4以降の倍率負担を規制する条件であり、前記第4レンズ群G4がフォーカス時に移動した時の結像面の敏感度を規定する。この敏感度を適切に規定することにより、AF時に合焦範囲内にフォーカスレンズ群を駆動制御することが可能になる。 Conditional expression (4) drives and controls the fourth lens group G4, which is a focus lens group, within the in-focus range during AF, so that the fourth lens group G4 and the magnification burden on and after the fourth lens group G4 are applied. This is a regulation condition, and defines the sensitivity of the image plane when the fourth lens group G4 moves during focusing. By properly defining this sensitivity, it becomes possible to drive and control the focus lens group within the focusing range during AF.
条件式(4)の上限値を超え、結像面の敏感度が大きくなると、フォーカスレンズ群の移動量が少なくなるため、フォーカスレンズ群の微少な動きで結像面が大きく動き、AF合焦範囲内にフォーカスレンズ群である前記第4レンズ群G4を駆動制御することが困難になる。 When the upper limit of conditional expression (4) is exceeded and the sensitivity of the image forming surface increases, the amount of movement of the focus lens group decreases, so a slight movement of the focus lens group causes a large movement of the image forming surface, resulting in AF focusing. It becomes difficult to drive and control the fourth lens group G4 which is the focus lens group within the range.
条件式(4)の下限値を超え、結像面の敏感度が小さくなると、フォーカスレンズ群の移動量が大きくなり、フォーカシングのための第3レンズ群G3と第5レンズ群G5とのスペースを確保しなければならず、レンズ光学系をコンパクトにすることが困難になる。またウオブリングによる合焦レンズ群の主光線高の変動が大きくなる為、像高変動を抑制する効果が弱くなり、ウオブリング時の像高変動を抑えることが困難になる。 If the lower limit of conditional expression (4) is exceeded and the sensitivity of the image forming surface decreases, the amount of movement of the focus lens group increases and the space between the third lens group G3 and the fifth lens group G5 for focusing is increased. It must be ensured, and it becomes difficult to make the lens optical system compact. Further, since the chief ray height of the focusing lens unit changes greatly due to the wobbling, the effect of suppressing the image height fluctuation becomes weak, and it becomes difficult to suppress the image height fluctuation during the wobbling.
なお、条件式(4)について、その上限値をさらに4.70、また、下限値をさらに1.54とすることで、前述の効果をより確実にすることができる。 In conditional expression (4), the upper limit value is further set to 4.70, and the lower limit value is further set to 1.54, whereby the above-described effect can be further ensured.
条件式(5)は、フォーカスレンズ群である前記第4レンズ群のG4の無限遠時の横倍率を規定し、フォーカス時の収差変動の抑制およびフォーカス群の繰り出し量を規定するための条件である。 Conditional expression (5) is a condition for defining the lateral magnification of G4 of the fourth lens group that is the focus lens group at infinity, suppressing the aberration variation during focusing, and defining the amount of extension of the focus group. is there.
条件式(5)の上限値を超えて、前記第4レンズ群G4の無限遠時の横倍率が1に近づくと、フォーカスのための繰出し量が大きくなり、繰り出し量を確保する空間が必要となり全長の大型化につながり好ましくない。 When the lateral magnification of the fourth lens group G4 at infinity approaches 1 beyond the upper limit of conditional expression (5), the amount of extension for focusing increases, and a space for securing the amount of extension is required. This is not preferable because it leads to an increase in the total length.
一方、条件式(5)の下限値を超えて、前記第4レンズ群G4の無限遠時の横倍率が小さくなると、フォーカス群に入射する光線がアフォーカルに近づく、さらにゼロを超え負になると、フォーカス群が実像系になるため、全系が至近距離にフォーカスする際のフォーカス群である前記第4レンズ群G4の物点の移動が大きくなる為、無限遠から至近に変動した時の収差変動を抑えることが困難になる。 On the other hand, if the lateral magnification of the fourth lens group G4 at infinity is decreased below the lower limit of conditional expression (5), the light beam entering the focus group approaches afocal, and further exceeds zero and becomes negative. Since the focus group becomes a real image system, the movement of the object point of the fourth lens group G4, which is the focus group when the whole system focuses at a close distance, becomes large, so that the aberration fluctuation when changing from infinity to a close distance It becomes difficult to suppress.
なお、条件式(5)について、その上限値をさらに0.68に、また、下限値をさらに0.23とすることで、前述の効果をより確実にすることができる。 In conditional expression (5), the upper limit value is further set to 0.68, and the lower limit value is further set to 0.23, whereby the above-described effect can be further ensured.
また、前記第5レンズ群は、以下の条件式を満足することが望ましい。
(6)−0.85<f5/ft<−0.15
ただし
f5:前記第5レンズ群の焦点距離
ft:望遠端における物体距離無限遠時の焦点距離
Further, it is desirable that the fifth lens group satisfies the following conditional expression.
(6) -0.85<f5/ft<-0.15
Here, f5: focal length of the fifth lens group ft: object distance at the telephoto end, focal length at infinity
条件式(6)は、固定群である前記第5レンズ群の焦点距離を規定し、拡大系の倍率負担とすることにより、全系を望遠タイプにし、全長を短縮するための条件である。 Conditional expression (6) is a condition for defining the focal length of the fifth lens group, which is a fixed group, and making the magnification system burden the magnifying system, thereby making the entire system a telephoto type and shortening the overall length.
条件式(6)の上限値を超えて、前記第5レンズ群の負の屈折力が強くなると、固定群である共役長が短くなる為、全長が小型化するが、球面収差、像面湾曲がプラスに過度に発生し、さらに正の歪曲収差が増大し、それらの補正が困難になる。 If the upper limit of conditional expression (6) is exceeded and the negative refracting power of the fifth lens group becomes strong, the conjugate length of the fixed group becomes short, so the overall length becomes small, but spherical aberration and field curvature are reduced. Excessively occur, and positive distortion aberration increases, which makes it difficult to correct them.
一方、条件式(6)の下限値を超えて、前記第5レンズ群の負の屈折力が弱くなると、固定群である共役長が長くなる為、全長が大型化し好ましくない。またフォーカス群である前記第4レンズ群との間隔を保持することができなくなる。 On the other hand, when the lower limit of conditional expression (6) is exceeded and the negative refractive power of the fifth lens group becomes weak, the conjugate length of the fixed group becomes long, which undesirably increases the overall length. Further, it becomes impossible to maintain the distance from the fourth lens group, which is the focus group.
なお、条件式(6)について、その上限値をさらに−0.18に、また、下限値をさらに−0.73とすることで、前述の効果をより確実にすることができる。 In conditional expression (6), if the upper limit value is further set to −0.18 and the lower limit value is further set to −0.73, the above effect can be further ensured.
また、前記第2aレンズ群は、以下の条件式を満足することが望ましい。
(7)−7.50<(G2a2+G2a1)/(G2a2−G2a1)<−1.05
ただし
G2a1:前記第2aレンズ群の物体側の曲率半径
G2a2:前記第2aレンズ群の像側の曲率半径
Further, it is desirable that the second-a lens group satisfies the following conditional expression.
(7) −7.50<(G2a2+G2a1)/(G2a2-G2a1)<−1.05
Where G2a1 is the radius of curvature of the second lens group on the object side G2a2 is the radius of curvature of the second lens group on the image side
条件式(7)は前記第2aレンズ群のレンズ形状、いわゆるシェイプファクターを定義するものである。前記第2レンズ群に入射する光線は、前記第1レンズ群が正の屈折力であるために、収斂光線となるが、前記第2aレンズ群は負の屈折力を持つため、前記第2aレンズ群の物体側の曲率半径がマイナスの場合、入射角がきつくなる。その入射角を緩和するには前記第2aレンズ群の物体側の曲率半径がプラスであることが必須になる。 Conditional expression (7) defines the lens shape of the 2a lens group, that is, the so-called shape factor. The light beam incident on the second lens group is a convergent light beam because the first lens group has a positive refractive power, but the second a lens group has a negative refractive power, and thus the second a lens element has a negative refractive power. When the radius of curvature on the object side of the group is negative, the incident angle becomes tight. In order to reduce the incident angle, it is essential that the radius of curvature of the second-a lens unit on the object side is positive.
条件式(7)の上限値を超えて、前記第2aレンズ群のシェイプファクターが−1に近づくとレンズ形状が平凹レンズに近づくため、前記第2aレンズ群への入射角がきつくなり、好ましくない。 If the shape factor of the second-a lens group approaches -1 beyond the upper limit of conditional expression (7), the lens shape approaches a plano-concave lens, and the incident angle to the second-a lens group becomes tight, which is not preferable. ..
一方、条件式(7)の下限値を超えて、前記第2aレンズ群のシェイプファクターが負の方向に大きくなると、条件式(2)と相俟って、前記第2aレンズ群の負の屈折力が弱くなるため、前記第2aレンズ群と第2bレンズ群の空気間隔が広がりすぎ、全長が大型化するため好ましくない。 On the other hand, when the shape factor of the second-a lens group becomes large in the negative direction beyond the lower limit of the conditional expression (7), the negative refraction of the second-a lens group is combined with the conditional expression (2). Since the power becomes weak, the air gap between the second-a lens group and the second-b lens group becomes too wide, and the total length becomes large, which is not preferable.
なお、条件式(7)について、その上限値をさらに−1.23に、また、下限値をさらに−6.30とすることで、前述の効果をより確実にすることができる。 In conditional expression (7), the upper limit value is further set to −1.23, and the lower limit value is further set to −6.30, whereby the above-described effect can be further ensured.
次に、本発明に係る変倍結像光学系の各実施例のレンズ構成について説明する。以下の説明において、レンズ構成を物体側から像側の順番で記載する。Lnは物体側から順番にレンズを数えたときのレンズ番号nに対応するレンズを示す記号であり、接合レンズの場合にはこれを構成するそれぞれのレンズ1枚ごとに記号を示すこととする。 Next, the lens configuration of each embodiment of the variable power imaging optical system according to the present invention will be described. In the following description, the lens configurations will be described in order from the object side to the image side. Ln is a symbol indicating the lens corresponding to the lens number n when the lenses are sequentially counted from the object side, and in the case of a cemented lens, the symbol is indicated for each of the lenses constituting the lens.
次に、本発明に係る変倍結像光学系の各実施例の数値実施例と条件式対応値について説明する。 Next, numerical examples of each embodiment of the variable power imaging optical system according to the present invention and the values corresponding to the conditional expressions will be described.
[面データ]において、面番号は物体側から順番に数えたレンズ面または開口絞りの番号、rはレンズ面の曲率半径、dはレンズ面の間隔、ndはd線(波長587.56nm)に対する屈折率、νdはd線(波長587.56nm)に対するアッベ数を示している。 In [Surface data], the surface number is the number of the lens surface or aperture stop counted from the object side, r is the radius of curvature of the lens surface, d is the distance between the lens surfaces, and nd is for the d line (wavelength 587.56 nm). The refractive index, νd, represents the Abbe number for the d-line (wavelength 587.56 nm).
面番号に付した*(アスタリスク)は、そのレンズ面形状が非球面であることを示している。また、BFはバックフォーカスを表している。 The * (asterisk) attached to the surface number indicates that the lens surface shape is an aspherical surface. In addition, BF represents the back focus.
面番号に付した(絞り)は、その位置に開口絞りが位置していることを示している。平面又は開口絞りに対する曲率半径には∞(無限大)を記入している。 The (aperture) attached to the surface number indicates that the aperture stop is located at that position. ∞ (infinity) is entered in the radius of curvature for a plane or an aperture stop.
[非球面データ]には、[面データ]において*を付したレンズ面の非球面形状を与える各係数の値を示している。非球面の形状は、下記の式で表される。以下の式において、光軸に直行する方向への光軸からの変位をy、非球面と光軸の交点から光軸方向へのへに(サグ量)をz、基準球面の曲率半径をr、コーニック係数をKで表している。また、4、6、8、10次の非球面係数をそれぞれA4、A6、A8、A10で表している。
In [Aspherical surface data], the value of each coefficient giving the aspherical shape of the lens surface marked with * in [Surface data] is shown. The shape of the aspherical surface is represented by the following formula. In the following equation, y is the displacement from the optical axis in the direction orthogonal to the optical axis, z is the amount (sag amount) from the intersection of the aspherical surface and the optical axis in the optical axis direction, and the radius of curvature of the reference spherical surface is r. , The conic coefficient is represented by K. The fourth, sixth, eighth, and tenth-order aspherical coefficients are represented by A4, A6, A8, and A10, respectively.
[各種データ]において、ズーム比及び各焦点距離状態における焦点距離等の値を示している。 [Various data] shows values such as the zoom ratio and the focal length in each focal length state.
[可変間隔データ]において、各焦点距離状態における可変間隔及びBFの値を示している。 In [Variable distance data], the variable distance and the value of BF in each focal length state are shown.
[レンズ群データ]において、各レンズ群を構成する最も物体側のレンズ面の面番号及びレンズ群全体の焦点距離を示している。 In [lens group data], the surface number of the lens surface closest to the object that constitutes each lens group and the focal length of the entire lens group are shown.
各実施例に対応する各収差図において、d、g、Cはそれぞれd線、g線、C線を表しており、△S、△Mはそれぞれサジタル像面、メリジオナル像面を表している。 In each aberration diagram corresponding to each example, d, g, and C represent d line, g line, and C line, respectively, and ΔS and ΔM represent sagittal image plane and meridional image plane, respectively.
なお、以下の全ての諸元の値において、記載している焦点距離f、曲率半径r、レンズ面間隔d、その他の長さの単位は特記のない限りミリメートル(mm)を使用するが、光学系では比例拡大と比例縮小とにおいても同等の光学性能が得られるので、これに限られるものではない。 It should be noted that, in the values of all the following specifications, the focal length f, the radius of curvature r, the lens surface distance d, and other units of the length used are millimeters (mm) unless otherwise specified. The same optical performance can be obtained in the system even in the case of proportional enlargement and proportional reduction, so the present invention is not limited to this.
図1は、本発明の実施例1の結像光学系のレンズ構成図である。 First Embodiment FIG. 1 is a lens configuration diagram of an image forming optical system according to a first embodiment of the present invention.
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、正の屈折力の第4レンズ群、負の屈折力の第5レンズ群からなり、開口絞りは第3レンズ群内にあり、変倍時に、前記第1、5レンズ群が像面に対し固定であり、無限遠物体から近距離物体へのフォーカシングに際して、前記第4レンズ群が光軸に沿って物体側に移動する。 In order from the object side to the image side, the first lens group having positive refractive power, the second lens group having negative refractive power, the third lens group having positive refractive power, the fourth lens group having positive refractive power, and the negative lens group It consists of a fifth lens group having a refractive power, an aperture stop is inside the third lens group, and at the time of zooming, the first and fifth lens groups are fixed with respect to the image plane, and from an infinite object to a short-distance object. At the time of focusing, the fourth lens group moves toward the object side along the optical axis.
第1レンズ群G1は、物体側に凸面を向けた負メニスカスレンズL1と両凸レンズL2からなる接合レンズと、物体側に凸面を向けた正メニスカスレンズL3から構成される。 The first lens group G1 includes a cemented lens including a negative meniscus lens L1 having a convex surface directed toward the object side and a biconvex lens L2, and a positive meniscus lens L3 having a convex surface directed toward the object side.
第2レンズ群G2は、物体側より順に負の屈折力の第2aレンズ群G2aと負の屈折力の第2bレンズ群G2bから構成され、第2aレンズ群G2aは、物体側に凸面を向けた負メニスカスレンズL4で構成される。第2bレンズ群G2bは、両凹レンズL5と物体側に凸面を向けた正メニスカスレンズからなるL6接合レンズと、両凹レンズL7から構成される。 The second lens group G2 is composed of, in order from the object side, a second lens group G2a having a negative refractive power and a second lens group G2b having a negative refractive power, and the second lens group G2a has a convex surface directed toward the object side. It is composed of a negative meniscus lens L4. The second-b lens group G2b includes a biconcave lens L5, an L6 cemented lens including a positive meniscus lens having a convex surface directed toward the object side, and a biconcave lens L7.
第3レンズ群G3は、両凸レンズL8と、物体側に凸面を向けた負メニスカスレンズL9と両凸レンズL10からなる接合レンズと、物体側に凹面を向けた負メニスカスレンズL11から構成される。 The third lens group G3 includes a biconvex lens L8, a cemented lens including a negative meniscus lens L9 having a convex surface facing the object side and a biconvex lens L10, and a negative meniscus lens L11 having a concave surface facing the object side.
開口絞りは第3レンズ群G3内に備えられる。 The aperture stop is provided in the third lens group G3.
第4レンズ群G4は、両凸レンズL12と物体側に凹面を向けた負メニスカスレンズL13からなる接合レンズから構成される。 The fourth lens group G4 is composed of a cemented lens including a biconvex lens L12 and a negative meniscus lens L13 having a concave surface facing the object side.
第5レンズ群G5は、物体側より順に負の屈折力の第5aレンズ群G5aと正の屈折力の第5bレンズ群G5bから構成され、第5aレンズ群G5aは、物体側に凹面を向けた正メニスカスレンズL14と両凹レンズL15からなる接合レンズと、両凹レンズL16から構成され、第5bレンズ群G5bは、両凸レンズL17、両凸レンズL18と物体側に凹面を向けた負メニスカスレンズL19からなる接合レンズ、両凹レンズL20、物体側に凹面を向けた負メニスカスレンズL21、物体側が非球面の物体側に凸面を向けた正メニスカスレンズL22から構成される。さらに第5aレンズ群G5aを光軸に対して垂直方向に変位させることによって防振を行う。 The fifth lens group G5 is composed of, in order from the object side, a 5a lens group G5a having a negative refractive power and a 5b lens group G5b having a positive refractive power, and the 5a lens group G5a has a concave surface facing the object side. It is composed of a cemented lens composed of a positive meniscus lens L14 and a biconcave lens L15, and a biconcave lens L16. The fifth-b lens group G5b is composed of a biconvex lens L17, a biconvex lens L18, and a negative meniscus lens L19 having a concave surface facing the object side. The lens includes a biconcave lens L20, a negative meniscus lens L21 having a concave surface facing the object side, and a positive meniscus lens L22 having an aspherical object surface facing the object side. Further, the fifth-a lens group G5a is displaced in the direction perpendicular to the optical axis to perform image stabilization.
続いて、以下に実施例1に係る変倍結像光学系の諸元値を示す。
数値実施例1
単位:mm
[面データ]
面番号 r d nd vd
物面 ∞ ∞
1 104.1435 1.7044 1.75520 27.53
2 70.7378 10.5774 1.49700 81.61
3 -393.0210 0.1504
4 63.0371 6.4166 1.43700 95.10
5 162.4050 (d5)
6 48.8767 0.9023 1.80610 33.27
7 30.8150 18.0978
8 -62.0705 0.9023 1.48749 70.44
9 35.1993 3.3109 1.84666 23.78
10 193.7738 1.7399
11 -107.6795 0.9023 1.77250 49.62
12 129.7430 (d12)
13 90.0200 3.1382 1.80450 39.64
14 -209.9745 1.0026
15(絞り) ∞ 1.5066
16 53.3823 0.9023 2.00100 29.13
17 29.0180 4.0328 1.59282 68.62
18 -213.9557 1.2257
19 -67.7684 0.9023 1.80000 29.84
20 -101.8975 (d20)
21 64.1705 14.4940 1.48749 70.44
22 -30.4353 0.8021 1.69895 30.05
23 -58.6639 (d23)
24 -541.7863 2.8254 1.84666 23.78
25 -35.5372 0.8021 1.59349 67.00
26 27.2703 4.1555
27 -51.1925 0.8021 1.80100 34.97
28 80.4006 1.4437
29 35.7054 8.5565 1.49700 81.61
30 -34.3847 0.1504
31 54.3906 9.6386 1.69895 30.05
32 -22.6991 0.9023 1.84666 23.78
33 -136.9668 0.9838
34 -85.4243 0.9023 1.72916 54.67
35 925.3006 9.3045
36 -23.7134 0.9023 1.83481 42.72
37 -43.7140 0.1504
38* 38.5065 3.6767 1.58913 61.25
39 60.6067 19.9969
40 ∞ 2.1000 1.51680 64.17
41 ∞ (BF)
像面 ∞
[非球面データ]
38面
K 0.00000
A4 -6.45721E-07
A6 9.56314E-10
A8 1.34043E-12
A10 -2.08943E-15
[各種データ]
ズーム比 2.67
広角 中間 望遠
焦点距離 72.54 115.69 193.35
Fナンバー 4.06 4.00 3.92
全画角2ω 33.43 20.86 12.40
像高Y 21.63 21.63 21.63
レンズ全長 198.38 198.38 198.38
[可変間隔データ]
広角 中間 望遠
d0 ∞ ∞ ∞
d5 0.7620 20.0411 36.7236
d12 36.9420 20.6286 1.2232
d20 11.0165 7.2774 18.4187
d23 9.1462 9.9197 1.5012
BF 0.5075 0.5075 0.5075
広角 中間 望遠
d0 801.6213 801.6213 801.6213
d5 0.7620 20.0411 36.7236
d12 36.9420 20.6286 1.2232
d20 8.5502 1.3610 1.5074
d23 11.6125 15.8361 18.4125
BF 0.5075 0.5076 0.5074
[レンズ群データ]
群 始面 焦点距離
G1 1 110.02
G2 6 -36.12
G3 13 61.10
G4 21 82.04
G5 24 -57.82
G2a 6 -105.81
G2b 8 -65.88
G5a 24 -22.91
G5b 29 33.56
Next, the following are the specifications of the variable power imaging optical system according to the first example.
Numerical Example 1
Unit: mm
[Surface data]
Surface number rd nd vd
Object ∞ ∞
1 104.1435 1.7044 1.75520 27.53
2 70.7378 10.5774 1.49700 81.61
3 -393.0210 0.1504
4 63.0371 6.4166 1.43700 95.10
5 162.4050 (d5)
6 48.8767 0.9023 1.80610 33.27
7 30.8150 18.0978
8 -62.0705 0.9023 1.48749 70.44
9 35.1993 3.3109 1.84666 23.78
10 193.7738 1.7399
11 -107.6795 0.9023 1.77250 49.62
12 129.7430 (d12)
13 90.0200 3.1382 1.80450 39.64
14 -209.9745 1.0026
15 (aperture) ∞ 1.5066
16 53.3823 0.9023 2.00100 29.13
17 29.0180 4.0328 1.59282 68.62
18 -213.9557 1.2257
19 -67.7684 0.9023 1.80000 29.84
20 -101.8975 (d20)
21 64.1705 14.4940 1.48749 70.44
22 -30.4353 0.8021 1.69895 30.05
23 -58.6639 (d23)
24 -541.7863 2.8254 1.84666 23.78
25 -35.5372 0.8021 1.59349 67.00
26 27.2703 4.1555
27 -51.1925 0.8021 1.80100 34.97
28 80.4006 1.4437
29 35.7054 8.5565 1.49700 81.61
30 -34.3847 0.1504
31 54.3906 9.6386 1.69895 30.05
32 -22.6991 0.9023 1.84666 23.78
33 -136.9668 0.9838
34 -85.4243 0.9023 1.72916 54.67
35 925.3006 9.3045
36 -23.7134 0.9023 1.83481 42.72
37 -43.7 140 0.1504
38* 38.5065 3.6767 1.58913 61.25
39 60.6067 19.9969
40 ∞ 2.1000 1.51680 64.17
41 ∞ (BF)
Image plane ∞
[Aspherical data]
38 sides
K 0.00000
A4 -6.45721E-07
A6 9.56314E-10
A8 1.34043E-12
A10 -2.08943E-15
[Various data]
Zoom ratio 2.67
Wide-angle mid-telephoto focal length 72.54 115.69 193.35
F number 4.06 4.00 3.92
Full angle of view 2ω 33.43 20.86 12.40
Image height Y 21.63 21.63 21.63
Total lens length 198.38 198.38 198.38
[Variable interval data]
Wide-angle mid-telephoto
d0 ∞ ∞ ∞
d5 0.7620 20.0411 36.7236
d12 36.9420 20.6286 1.2232
d20 11.0165 7.2774 18.4187
d23 9.1462 9.9197 1.5012
BF 0.5075 0.5075 0.5075
Wide-angle mid-telephoto
d0 801.6213 801.6213 801.6213
d5 0.7620 20.0411 36.7236
d12 36.9420 20.6286 1.2232
d20 8.5502 1.3610 1.5074
d23 11.6125 15.8361 18.4125
BF 0.5075 0.5076 0.5074
[Lens group data]
Focal length of group start surface
G2 6 -36.12
G4 21 82.04
G5 24 -57.82
G2a 6 -105.81
G2b 8 -65.88
G5a 24 -22.91
G5b 29 33.56
図14は、本発明の実施例2の結像光学系のレンズ構成図である。 FIG. 14 is a lens configuration diagram of an image forming optical system according to a second embodiment of the present invention.
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、正の屈折力の第4レンズ群、負の屈折力の第5レンズ群からなり、開口絞りは第3レンズ群内にあり、変倍時に、前記第1、5レンズ群が像面に対し固定であり、無限遠物体から近距離物体へのフォーカシングに際して、前記第4レンズ群が光軸に沿って物体側に移動する。 In order from the object side to the image side, the first lens group having positive refractive power, the second lens group having negative refractive power, the third lens group having positive refractive power, the fourth lens group having positive refractive power, and the negative lens group It consists of a fifth lens group having a refractive power, an aperture stop is inside the third lens group, and at the time of zooming, the first and fifth lens groups are fixed with respect to the image plane, and from an infinite object to a short-distance object. At the time of focusing, the fourth lens group moves toward the object side along the optical axis.
第1レンズ群G1は、物体側に凸面を向けた負メニスカスレンズL1と両凸レンズL2からなる接合レンズと、物体側に凸面を向けた正メニスカスレンズL3から構成される。 The first lens group G1 includes a cemented lens including a negative meniscus lens L1 having a convex surface directed toward the object side and a biconvex lens L2, and a positive meniscus lens L3 having a convex surface directed toward the object side.
第2レンズ群G2は、物体側より順に負の屈折力の第2aレンズ群G2aと負の屈折力の第2bレンズ群G2bから構成され、第2aレンズ群G2aは、物体側に凸面を向けた負メニスカスレンズL4で構成される。第2bレンズ群G2bは、両凹レンズL5と物体側に凸面を向けた正メニスカスレンズL6からなる接合レンズ、物体側に凹面を向けた負メニスカスレンズL7から構成される。 The second lens group G2 is composed of, in order from the object side, a second lens group G2a having a negative refractive power and a second lens group G2b having a negative refractive power, and the second lens group G2a has a convex surface directed toward the object side. It is composed of a negative meniscus lens L4. The 2b-th lens group G2b includes a cemented lens including a biconcave lens L5, a positive meniscus lens L6 having a convex surface directed toward the object side, and a negative meniscus lens L7 having a concave surface directed toward the object side.
第3レンズ群G3は、両凸レンズL8と、物体側に凸面を向けた負メニスカスレンズL9と物体側に凸面を向けた正メニスカスレンズL10からなる接合レンズと、物体側に凸面を向けた正メニスカスレンズL11から構成される。 The third lens group G3 includes a biconvex lens L8, a cemented lens including a negative meniscus lens L9 having a convex surface directed toward the object side and a positive meniscus lens L10 having a convex surface directed toward the object side, and a positive meniscus surface having a convex surface directed toward the object side. It is composed of a lens L11.
開口絞りは第3レンズ群G3内に備えられる。 The aperture stop is provided in the third lens group G3.
第4レンズ群G4は、両凸レンズL12と物体側に凹面を向けた負メニスカスレンズL13からなる接合レンズから構成される。 The fourth lens group G4 is composed of a cemented lens including a biconvex lens L12 and a negative meniscus lens L13 having a concave surface facing the object side.
第5レンズ群G5は、物体側より順に負の屈折力の第5aレンズ群G5aと正の屈折力の第5bレンズ群G5bから構成され、第5aレンズ群G5aは、物体側に凹面を向けた正メニスカスレンズL14と両凹レンズL15からなる接合レンズ、両凹レンズL16から構成され、第5bレンズ群G5bは、両凸レンズL17、両凸レンズL18と物体側に凹面を向けた負メニスカスレンズL19からなる接合レンズ、物体側に凹面を向けた負メニスカスレンズL20、物体側に凸面を向けた正メニスカスレンズL21から構成される。さらに第5aレンズ群G5aを光軸に対して垂直方向に変位させることによって防振を行う。 The fifth lens group G5 is composed of, in order from the object side, a 5a lens group G5a having a negative refractive power and a 5b lens group G5b having a positive refractive power, and the 5a lens group G5a has a concave surface facing the object side. The cemented lens includes a positive meniscus lens L14 and a biconcave lens L15, and a biconcave lens L16. The fifth-b lens group G5b includes a biconvex lens L17, a biconvex lens L18, and a negative meniscus lens L19 having a concave surface facing the object side. , A negative meniscus lens L20 having a concave surface facing the object side, and a positive meniscus lens L21 having a convex surface facing the object side. Further, the fifth-a lens group G5a is displaced in the direction perpendicular to the optical axis to perform image stabilization.
続いて、以下に実施例2に係る変倍結像光学系の諸元値を示す。
数値実施例2
単位:mm
[面データ]
面番号 r d nd vd
物面 ∞ ∞
1 95.1533 1.7040 1.75520 27.53
2 64.6683 10.5748 1.49700 81.61
3 -648.3346 0.1504
4 70.2935 6.4151 1.43700 95.10
5 244.6238 (d5)
6 52.5486 0.9021 1.63854 55.45
7 29.0322 17.9554
8 -61.0163 0.9021 1.48749 70.44
9 35.7265 2.5995 1.84666 23.78
10 95.8768 2.2167
11 -84.3778 0.9021 1.77250 49.62
12 -1565.9201 (d12)
13 80.4027 2.3555 1.80450 39.64
14 -255.2669 1.0024
15(絞り) ∞ 1.5602
16 46.9150 0.9021 2.00100 29.13
17 23.6716 5.1120 1.59282 68.62
18 489.0889 0.1500
19 19.8763 3.3040 1.77250 49.62
20 18.5929 (d20)
21 53.1497 5.4628 1.48749 70.44
22 -38.9117 0.8019 1.69895 30.05
23 -80.4712 (d23)
24 -160.0169 2.8066 1.84666 23.78
25 -29.4947 0.8019 1.59349 67.00
26 32.1959 3.6804
27 -52.8580 0.8019 1.80100 34.97
28 62.0369 1.4434
29 42.4419 7.7427 1.49700 81.61
30 -32.0999 0.1504
31 91.4035 9.5352 1.69895 30.05
32 -21.2766 0.9021 1.84666 23.78
33 -95.0816 4.7539
34 -33.7844 0.9021 1.72916 54.67
35 -97.6852 5.2367
36 41.0628 4.1027 1.58913 61.25
37 72.8524 22.6332
38 ∞ 2.1000 1.51680 64.17
39 ∞ (BF)
像面 ∞
[各種データ]
ズーム比 2.65
広角 中間 望遠
焦点距離 72.98 114.89 193.37
Fナンバー 4.09 4.05 3.89
全画角2ω 33.15 20.97 12.39
像高Y 21.63 21.63 21.63
レンズ全長 199.23 199.23 199.23
[可変間隔データ]
広角 中間 望遠
d0 ∞ ∞ ∞
d5 0.6745 19.1181 37.6050
d12 35.1842 19.1515 1.2229
d20 18.5117 14.0929 22.8308
d23 8.7869 10.7949 1.4987
BF 3.5107 3.5107 3.5107
広角 中間 望遠
d0 800.7657 800.7657 800.7657
d5 0.6745 19.1181 37.6050
d12 35.1842 19.1515 1.2229
d20 15.7128 7.6415 4.1995
d23 11.5858 17.2463 20.1300
BF 3.5107 3.5106 3.5106
[レンズ群データ]
群 始面 焦点距離
G1 1 110.28
G2 6 -35.33
G3 13 56.33
G4 21 81.32
G5 24 -117.85
G2a 6 -103.14
G2b 8 -64.36
G5a 24 -22.13
G5b 29 33.41
Next, the following are the specifications of the variable power imaging optical system according to the second embodiment.
Numerical Example 2
Unit: mm
[Surface data]
Surface number rd nd vd
Object ∞ ∞
1 95.1533 1.7040 1.75520 27.53
2 64.6683 10.5748 1.49700 81.61
3 -648.3346 0.1504
4 70.2935 6.4151 1.43700 95.10
5 244.6238 (d5)
6 52.5486 0.9021 1.63854 55.45
7 29.0322 17.9554
8 -61.0163 0.9021 1.48749 70.44
9 35.7265 2.5995 1.84666 23.78
10 95.8768 2.2167
11 -84.3778 0.9021 1.77250 49.62
12 -1565.9201 (d12)
13 80.4027 2.3555 1.80450 39.64
14 -255.2669 1.0024
15 (aperture) ∞ 1.5602
16 46.9150 0.9021 2.00100 29.13
17 23.6716 5.1120 1.59282 68.62
18 489.0889 0.1500
19 19.8763 3.3040 1.77250 49.62
20 18.5929 (d20)
21 53.1497 5.4628 1.48749 70.44
22 -38.9117 0.8019 1.69895 30.05
23 -80.4712 (d23)
24 -160.0169 2.8066 1.84666 23.78
25 -29.4947 0.8019 1.59349 67.00
26 32.1959 3.6804
27 -52.8580 0.8019 1.80100 34.97
28 62.0369 1.4434
29 42.4419 7.7427 1.49700 81.61
30 -32.0999 0.1504
31 91.4035 9.5352 1.69895 30.05
32 -21.2766 0.9021 1.84666 23.78
33 -95.0816 4.7539
34 -33.7844 0.9021 1.72916 54.67
35 -97.6852 5.2367
36 41.0628 4.1027 1.58913 61.25
37 72.8524 22.6332
38 ∞ 2.1000 1.51680 64.17
39 ∞ (BF)
Image plane ∞
[Various data]
Zoom ratio 2.65
Wide-angle mid-telephoto focal length 72.98 114.89 193.37
F number 4.09 4.05 3.89
Full angle of view 2ω 33.15 20.97 12.39
Image height Y 21.63 21.63 21.63
Total lens length 199.23 199.23 199.23
[Variable interval data]
Wide-angle mid-telephoto
d0 ∞ ∞ ∞
d5 0.6745 19.1181 37.6050
d12 35.1842 19.1515 1.2229
d20 18.5117 14.0929 22.8308
d23 8.7869 10.7949 1.4987
BF 3.5107 3.5107 3.5107
Wide-angle mid-telephoto
d0 800.7657 800.7657 800.7657
d5 0.6745 19.1181 37.6050
d12 35.1842 19.1515 1.2229
d20 15.7128 7.6415 4.1995
d23 11.5858 17.2463 20.1300
BF 3.5107 3.5106 3.5106
[Lens group data]
Focal length of group start surface
G2 6 -35.33
G4 21 81.32
G5 24 -117.85
G2a 6 -103.14
G2b 8 -64.36
G5a 24 -22.13
G5b 29 33.41
図27は、本発明の実施例3の結像光学系のレンズ構成図である。 FIG. 27 is a lens configuration diagram of the image forming optical system according to the third embodiment of the present invention.
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、正の屈折力の第4レンズ群、負の屈折力の第5レンズ群からなり、開口絞りは第3レンズ群内にあり、変倍時に、前記第1、5レンズ群が像面に対し固定であり、無限遠物体から近距離物体へのフォーカシングに際して、前記第4レンズ群が光軸に沿って物体側に移動する。 In order from the object side to the image side, the first lens group having positive refractive power, the second lens group having negative refractive power, the third lens group having positive refractive power, the fourth lens group having positive refractive power, and the negative lens group It consists of a fifth lens group having a refractive power, an aperture stop is inside the third lens group, and at the time of zooming, the first and fifth lens groups are fixed with respect to the image plane, and from an infinite object to a short-distance object. At the time of focusing, the fourth lens group moves toward the object side along the optical axis.
第1レンズ群G1は、物体側に凸面を向けた負メニスカスレンズL1と両凸レンズL2からなる接合レンズと、物体側に凸面を向けた正メニスカスレンズL3から構成される。 The first lens group G1 includes a cemented lens including a negative meniscus lens L1 having a convex surface directed toward the object side and a biconvex lens L2, and a positive meniscus lens L3 having a convex surface directed toward the object side.
第2レンズ群G2は、物体側より順に負の屈折力の第2aレンズ群G2aと負の屈折力の第2bレンズ群G2bから構成され、第2aレンズ群G2aは、物体側に凸面を向けた負メニスカスレンズL4で構成される。第2bレンズ群G2bは、両凹レンズL5と物体側に凸面を向けた正メニスカスレンズL6からなる接合レンズ、物体側に凹面を向けた負メニスカスレンズL7から構成される。 The second lens group G2 is composed of, in order from the object side, a second lens group G2a having a negative refractive power and a second lens group G2b having a negative refractive power, and the second lens group G2a has a convex surface directed toward the object side. It is composed of a negative meniscus lens L4. The 2b-th lens group G2b includes a cemented lens including a biconcave lens L5, a positive meniscus lens L6 having a convex surface directed toward the object side, and a negative meniscus lens L7 having a concave surface directed toward the object side.
第3レンズ群G3は、両凸レンズL8と、物体側に凸面を向けた負メニスカスレンズL9と両凸レンズL10からなる接合レンズと、両凸レンズL11と、物体側に凹面を向けた負メニスカスレンズL12から構成される。 The third lens group G3 includes a biconvex lens L8, a cemented lens including a negative meniscus lens L9 having a convex surface facing the object side and a biconvex lens L10, a biconvex lens L11, and a negative meniscus lens L12 having a concave surface facing the object side. Composed.
開口絞りは第3レンズ群G3の像側に隣接して備えられる。 The aperture stop is provided adjacent to the image side of the third lens group G3.
第4レンズ群G4は、両凸レンズL13と物体側に凹面を向けた負メニスカスレンズL14からなる接合レンズから構成される。 The fourth lens group G4 is composed of a cemented lens including a biconvex lens L13 and a negative meniscus lens L14 having a concave surface facing the object side.
第5レンズ群G5は、物体側より順に負の屈折力の第5aレンズ群G5aと正の屈折力の第5bレンズ群G5bから構成され、第5aレンズ群G5aは、物体側に凹面を向けた凸メニスカスレンズL15と両凹レンズL16からなる接合レンズ、両凹レンズL17から構成され、第5bレンズ群G5bは、両凸レンズL18、両凸レンズL19と物体側に凹面を向けた負メニスカスレンズL20からなる接合レンズ、両凹レンズL21、両凹レンズL22、物体側が非球面の物体側に凸面を向けた正メニスカスレンズL23から構成される。さらに第5aレンズ群G5aを光軸に対して垂直方向に変位させることによって防振を行う。 The fifth lens group G5 is composed of, in order from the object side, a 5a lens group G5a having a negative refractive power and a 5b lens group G5b having a positive refractive power, and the 5a lens group G5a has a concave surface facing the object side. It is composed of a cemented lens composed of a convex meniscus lens L15 and a biconcave lens L16, and a biconcave lens L17. The fifth-b lens group G5b is composed of a biconvex lens L18, a biconvex lens L19, and a negative meniscus lens L20 having a concave surface facing the object side. , A biconcave lens L21, a biconcave lens L22, and a positive meniscus lens L23 whose object side is an aspherical surface and whose convex surface faces the object side. Further, the fifth-a lens group G5a is displaced in the direction perpendicular to the optical axis to perform image stabilization.
続いて、以下に実施例3に係る変倍結像光学系の諸元値を示す。
数値実施例3
単位:mm
[面データ]
面番号 r d nd vd
物面 ∞ ∞
1 125.0338 1.7040 1.75520 27.53
2 74.6823 10.5748 1.49700 81.61
3 -284.3886 0.1504
4 61.3585 6.4151 1.43700 95.10
5 410.2227 (d5)
6 183.7988 0.9021 1.63854 55.45
7 30.8530 6.5811
8 -54.0888 0.9021 1.48749 70.44
9 45.5011 3.2127 1.84666 23.78
10 285.0459 3.2403
11 -43.8783 2.2095 1.77250 49.62
12 -69.6336 (d12)
13 61.4500 4.9761 1.80450 39.64
14 -563.4548 2.5626
15 79.1279 0.9021 2.00100 29.13
16 29.4247 5.1120 1.59282 68.62
17 -831.6372 0.4883
18 155.8655 3.3579 1.91082 35.25
19 -221.7380 1.2369
20 -81.8941 0.9021 1.80000 29.84
21 -326.2223 1.0000
22(絞り) ∞ (d22)
23 66.1095 5.4628 1.48749 70.44
24 -48.8102 0.8019 1.69895 30.05
25 -98.2301 (d25)
26 -193.7031 4.5593 1.84666 23.78
27 -33.5108 0.8019 1.59349 67.00
28 43.6971 2.9670
29 -233.3669 0.8019 1.80100 34.97
30 47.0624 1.4434
31 35.4679 7.0666 1.49700 81.61
32 -34.7971 0.1504
33 363.2947 7.5610 1.69895 30.05
34 -19.0534 0.9021 1.84666 23.78
35 -38.6143 0.1504
36 -57.8786 0.9021 1.72916 54.67
37 5645.6988 6.0360
38 -27.2043 0.9021 1.83481 42.72
39 369.3131 0.1504
40* 26.9621 4.2690 1.58913 61.25
41 92.3433 29.2985
42 ∞ 2.1000 1.51680 64.17
43 ∞ (BF)
像面 ∞
[非球面データ]
40面
K 0.00000
A4 -1.44116E-05
A6 1.47374E-08
A8 -3.67808E-11
A10 3.02638E-14
[各種データ]
ズーム比 2.70
広角 中間 望遠
焦点距離 71.73 118.03 193.35
Fナンバー 4.21 4.10 3.98
全画角2ω 34.70 20.67 12.46
像高Y 21.63 21.63 21.63
レンズ全長 198.61 198.61 198.61
[可変間隔データ]
広角 中間 望遠
d0 ∞ ∞ ∞
d5 0.6745 21.6381 36.4473
d12 34.8570 18.8152 1.2229
d22 18.6981 12.3060 25.1679
d25 10.9675 12.4378 2.3590
BF 0.6603 0.6605 0.6604
広角 中間 望遠
d0 801.3857 801.3856 801.3857
d5 0.6745 21.6381 36.4473
d12 34.8570 18.8152 1.2229
d22 15.8949 5.2403 5.7388
d25 13.7707 19.5035 21.7882
BF 0.6603 0.6603 0.6604
[レンズ群データ]
群 始面 焦点距離
G1 1 97.39
G2 6 -34.31
G3 13 59.90
G4 23 99.29
G5 26 -64.72
G2a 6 -58.20
G2b 8 -96.07
G5a 26 -31.43
G5b 31 49.11
Subsequently, the various specifications of the variable power imaging optical system according to the third embodiment are shown below.
Numerical Example 3
Unit: mm
[Surface data]
Surface number rd nd vd
Object ∞ ∞
1 125.0338 1.7040 1.75520 27.53
2 74.6823 10.5748 1.49700 81.61
3 -284.3886 0.1504
4 61.3585 6.4151 1.43700 95.10
5 410.2227 (d5)
6 183.7988 0.9021 1.63854 55.45
7 30.8530 6.5811
8 -54.0888 0.9021 1.48749 70.44
9 45.5011 3.2127 1.84666 23.78
10 285.0459 3.2403
11 -43.8783 2.2095 1.77250 49.62
12 -69.6336 (d12)
13 61.4500 4.9761 1.80450 39.64
14 -563.4548 2.5626
15 79.1279 0.9021 2.00100 29.13
16 29.4247 5.1120 1.59282 68.62
17 -831.6372 0.4883
18 155.8655 3.3579 1.91082 35.25
19 -221.7380 1.2369
20 -81.8941 0.9021 1.80000 29.84
21 -326.2223 1.0000
22 (Aperture) ∞ (d22)
23 66.1095 5.4628 1.48749 70.44
24 -48.8102 0.8019 1.69895 30.05
25 -98.2301 (d25)
26 -193.7031 4.5593 1.84666 23.78
27 -33.5108 0.8019 1.59349 67.00
28 43.6971 2.9670
29 -233.3669 0.8019 1.80100 34.97
30 47.0624 1.4434
31 35.4679 7.0666 1.49700 81.61
32 -34.7971 0.1504
33 363.2947 7.5610 1.69895 30.05
34 -19.0534 0.9021 1.84666 23.78
35 -38.6143 0.1504
36 -57.8786 0.9021 1.72916 54.67
37 5645.6988 6.0360
38 -27.2043 0.9021 1.83481 42.72
39 369.3131 0.1504
40* 26.9621 4.2690 1.58913 61.25
41 92.3433 29.2985
42 ∞ 2.1000 1.51680 64.17
43 ∞ (BF)
Image plane ∞
[Aspherical data]
40 sides
K 0.00000
A4 -1.44116E-05
A6 1.47374E-08
A8 -3.67808E-11
A10 3.02638E-14
[Various data]
Zoom ratio 2.70
Wide-angle mid-telephoto focal length 71.73 118.03 193.35
F number 4.21 4.10 3.98
Full angle of view 2ω 34.70 20.67 12.46
Image height Y 21.63 21.63 21.63
Total lens length 198.61 198.61 198.61
[Variable interval data]
Wide-angle mid-telephoto
d0 ∞ ∞ ∞
d5 0.6745 21.6381 36.4473
d12 34.8570 18.8152 1.2229
d22 18.6981 12.3060 25.1679
d25 10.9675 12.4378 2.3590
BF 0.6603 0.6605 0.6604
Wide-angle mid-telephoto
d0 801.3857 801.3856 801.3857
d5 0.6745 21.6381 36.4473
d12 34.8570 18.8152 1.2229
d22 15.8949 5.2403 5.7388
d25 13.7707 19.5035 21.7882
BF 0.6603 0.6603 0.6604
[Lens group data]
Focal length of group start surface
G2 6 -34.31
G4 23 99.29
G5 26 -64.72
G2a 6 -58.20
G2b 8 -96.07
G5a 26 -31.43
G5b 31 49.11
図40は、本発明の実施例4の結像光学系のレンズ構成図である。 FIG. 40 is a lens configuration diagram of the image forming optical system according to the fourth embodiment of the present invention.
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、正の屈折力の第4レンズ群、負の屈折力の第5レンズ群からなり、開口絞りは第3レンズ群内にあり、変倍時に、前記第1、3、5レンズ群が像面に対し固定であり、無限遠物体から近距離物体へのフォーカシングに際して、前記第4レンズ群が光軸に沿って物体側に移動する。 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, the fourth lens group having a positive refractive power, and the negative lens group It consists of a fifth lens group having a refractive power, an aperture stop is inside the third lens group, and the first, third, and fifth lens groups are fixed with respect to the image plane at the time of zooming. The fourth lens group moves toward the object side along the optical axis during the focusing on.
第1レンズ群G1は、物体側に凸面を向けた負メニスカスレンズL1と両凸レンズL2からなる接合レンズと、物体側に凸面を向けた正メニスカスレンズL3から構成される。 The first lens group G1 includes a cemented lens including a negative meniscus lens L1 having a convex surface directed toward the object side and a biconvex lens L2, and a positive meniscus lens L3 having a convex surface directed toward the object side.
第2レンズ群G2は、物体側より順に負の屈折力の第2aレンズ群G2aと負の屈折力の第2bレンズ群G2bから構成され、第2aレンズ群G2aは、物体側に凸面を向けた負メニスカスレンズL4で構成される。第2bレンズ群G2bは、両凹レンズL5と物体側に凸面を向けた正メニスカスレンズL6からなる接合レンズ、両凹レンズL7から構成される。 The second lens group G2 is composed of, in order from the object side, a second lens group G2a having a negative refractive power and a second lens group G2b having a negative refractive power, and the second lens group G2a has a convex surface directed toward the object side. It is composed of a negative meniscus lens L4. The second-b lens group G2b is composed of a biconcave lens L5 and a cemented lens composed of a positive meniscus lens L6 having a convex surface facing the object side, and a biconcave lens L7.
第3レンズ群G3は、両凸レンズL8と、物体側に凸面を向けた負メニスカスレンズL9と両凸レンズL10からなる接合レンズと、物体側に凹面を向けた負メニスカスレンズL11とから構成される。 The third lens group G3 includes a biconvex lens L8, a cemented lens including a negative meniscus lens L9 having a convex surface facing the object side and a biconvex lens L10, and a negative meniscus lens L11 having a concave surface facing the object side.
開口絞りは第3レンズ群G3の像側に隣接して備えられる。 The aperture stop is provided adjacent to the image side of the third lens group G3.
第4レンズ群G4は、両凸レンズL12と物体側に凹面を向けた負メニスカスレンズL13からなる接合レンズから構成される。 The fourth lens group G4 is composed of a cemented lens including a biconvex lens L12 and a negative meniscus lens L13 having a concave surface facing the object side.
第5レンズ群G5は、物体側より順に負の屈折力の第5aレンズ群G5aと正の屈折力の第5bレンズ群G5bから構成され、第5aレンズ群G5aは、両凸レンズL14と両凹レンズL15からなる接合レンズ、両凹レンズL16から構成され、第5bレンズ群G5bは、両凸レンズL17、両凸レンズL18と物体側に凹面を向けた負メニスカスレンズL19からなる接合レンズ、物体側に凸面を向けた負メニスカスレンズL20、物体側に凹面を向けた負メニスカスレンズL21、物体側が非球面で両凸レンズL22から構成される。さらに第5aレンズ群G5aを光軸に対して垂直方向に変位させることによって防振を行う。 The fifth lens group G5 is composed of, in order from the object side, a 5a lens group G5a having a negative refractive power and a 5b lens group G5b having a positive refractive power, and the 5a lens group G5a includes a biconvex lens L14 and a biconcave lens L15. The fifth-b lens unit G5b includes a biconvex lens L17, a biconvex lens L18, and a negative meniscus lens L19 having a concave surface facing the object side, and a convex surface facing the object side. It is composed of a negative meniscus lens L20, a negative meniscus lens L21 having a concave surface facing the object side, and a biconvex lens L22 having an aspherical surface on the object side. Further, the fifth-a lens group G5a is displaced in the direction perpendicular to the optical axis to perform image stabilization.
続いて、以下に実施例4に係る変倍結像光学系の諸元値を示す。
数値実施例4
単位:mm
[面データ]
面番号 r d nd vd
物面 ∞ ∞
1 95.3929 1.7044 1.75520 27.53
2 66.7118 10.5774 1.49700 81.61
3 -544.7168 0.1504
4 69.1282 6.4166 1.43700 95.10
5 192.6601 (d5)
6 43.3457 0.9023 1.80610 33.27
7 29.1376 16.5841
8 -69.6585 0.9023 1.48749 70.44
9 34.0491 2.9588 1.84666 23.78
10 136.8983 1.7842
11 -111.2917 0.9023 1.77250 49.62
12 154.5857 (d12)
13 127.2799 2.9949 1.80450 39.64
14 -98.4063 2.5092
15 61.7884 0.9023 2.00100 29.13
16 33.5992 3.4085 1.59282 68.62
17 -213.9557 1.3262
18 -57.8192 0.9023 1.80000 29.84
19 -175.9753 1.0000
20(絞り) ∞ (d20)
21 53.8148 5.8668 1.69680 55.46
22 -26.9365 0.8021 1.95150 29.83
23 -58.5023 (d23)
24 304.1544 3.1769 1.84666 23.78
25 -40.0449 0.8021 1.59349 67.00
26 23.2750 4.6814
27 -48.9683 0.8021 1.87071 40.73
28 68.3951 1.4437
29 34.4735 8.1736 1.49700 81.61
30 -33.9592 0.1504
31 35.8269 10.1373 1.68893 31.16
32 -23.7722 0.9023 1.84666 23.78
33 -631.9900 1.5564
34 483.0590 0.9023 1.80420 46.50
35 59.8426 6.8351
36 -22.2647 0.9023 1.83481 42.72
37 -82.9777 0.1504
38* 45.6600 4.8128 1.58913 61.25
39 -344.4059 19.9990
40 ∞ 2.1000 1.51680 64.17
41 ∞ (BF)
像面 ∞
[非球面データ]
38面
K 0.00000
A4 -5.48677E-06
A6 1.10428E-08
A8 -1.27385E-11
A10 6.40074E-15
[各種データ]
ズーム比 2.68
広角 中間 望遠
焦点距離 72.17 115.82 193.34
Fナンバー 4.18 4.11 3.99
全画角2ω 34.01 21.06 12.46
像高Y 21.63 21.63 21.63
レンズ全長 198.12 198.12 198.12
[可変間隔データ]
広角 中間 望遠
d0 ∞ ∞ ∞
d5 0.7620 20.7774 37.9099
d12 38.0763 21.0194 1.2232
d20 20.3894 17.8650 26.8410
d23 8.2498 7.8155 1.5034
BF 0.5191 0.5192 0.5192
広角 中間 望遠
d0 801.8801 801.8801 801.8800
d5 0.7620 20.7774 37.9099
d12 38.0763 21.0194 1.2232
d20 18.7544 13.8479 15.8976
d23 9.8847 11.8326 12.4468
BF 0.5192 0.5192 0.5192
[レンズ群データ]
群 始面 焦点距離
G1 1 111.49
G2 6 -38.62
G3 13 78.10
G4 21 51.48
G5 24 -41.34
G2a 6 -113.49
G2b 8 -68.59
G5a 24 -20.44
G5b 29 31.69
Subsequently, the various specifications of the variable power imaging optical system according to Example 4 are shown below.
Numerical Example 4
Unit: mm
[Surface data]
Surface number rd nd vd
Object ∞ ∞
1 95.3929 1.7044 1.75520 27.53
2 66.7118 10.5774 1.49700 81.61
3 -544.7168 0.1504
4 69.1282 6.4166 1.43700 95.10
5 192.6601 (d5)
6 43.3457 0.9023 1.80610 33.27
7 29.1376 16.5841
8 -69.6585 0.9023 1.48749 70.44
9 34.0491 2.9588 1.84666 23.78
10 136.8983 1.7842
11 -111.2917 0.9023 1.77250 49.62
12 154.5857 (d12)
13 127.2799 2.9949 1.80450 39.64
14 -98.4063 2.5092
15 61.7884 0.9023 2.00100 29.13
16 33.5992 3.4085 1.59282 68.62
17 -213.9557 1.3262
18 -57.8192 0.9023 1.80000 29.84
19 -175.9753 1.0000
20 (Aperture) ∞ (d20)
21 53.8148 5.8668 1.69680 55.46
22 -26.9365 0.8021 1.95150 29.83
23 -58.5023 (d23)
24 304.1544 3.1769 1.84666 23.78
25 -40.0449 0.8021 1.59349 67.00
26 23.2750 4.6814
27 -48.9683 0.8021 1.87071 40.73
28 68.3951 1.4437
29 34.4735 8.1736 1.49700 81.61
30 -33.9592 0.1504
31 35.8269 10.1373 1.68893 31.16
32 -23.7722 0.9023 1.84666 23.78
33 -631.9900 1.5564
34 483.0590 0.9023 1.80420 46.50
35 59.8426 6.8351
36 -22.2647 0.9023 1.83481 42.72
37 -82.9777 0.1504
38* 45.6600 4.8128 1.58913 61.25
39 -344.4059 19.9990
40 ∞ 2.1000 1.51680 64.17
41 ∞ (BF)
Image plane ∞
[Aspherical data]
38 sides
K 0.00000
A4 -5.48677E-06
A6 1.10428E-08
A8 -1.27385E-11
A10 6.40074E-15
[Various data]
Zoom ratio 2.68
Wide-angle mid-telephoto focal length 72.17 115.82 193.34
F number 4.18 4.11 3.99
Full angle of view 2ω 34.01 21.06 12.46
Image height Y 21.63 21.63 21.63
Total lens length 198.12 198.12 198.12
[Variable interval data]
Wide-angle mid-telephoto
d0 ∞ ∞ ∞
d5 0.7620 20.7774 37.9099
d12 38.0763 21.0194 1.2232
d20 20.3894 17.8650 26.8410
d23 8.2498 7.8155 1.5034
BF 0.5191 0.5192 0.5192
Wide-angle mid-telephoto
d0 801.8801 801.8801 801.8800
d5 0.7620 20.7774 37.9099
d12 38.0763 21.0194 1.2232
d20 18.7544 13.8479 15.8976
d23 9.8847 11.8326 12.4468
BF 0.5192 0.5192 0.5192
[Lens group data]
Focal length of group start surface
G2 6 -38.62
G4 21 51.48
G5 24 -41.34
G2a 6 -113.49
G2b 8 -68.59
G5a 24 -20.44
G5b 29 31.69
以下に各実施例に対応する条件式対応値を示す。
条件式/実施例 ex1 ex2 ex3 ex4
(1) 0.35<G2at/G2t<0.80 0.70 0.70 0.39 0.69
(2) 1.40<G2af/G2f<4.40 2.93 2.92 1.70 2.94
(3) 0.19<f4/ft<0.75 0.42 0.42 0.51 0.27
(4) 1.20<MR^2×(1−M4^2)<6.00 2.18 1.92 1.89 3.39
(5) 0.15<M4<0.80 0.50 0.54 0.56 0.32
(6) −0.85<F5/ft<−0.15 -0.30 -0.61 -0.33 -0.21
(7) 下記参照 -4.41 -3.47 -1.40 -5.10
※条件式(7) −7.50< (G2a2+G2a1)/(G2a2−G2a1)<−1.05
The values corresponding to the conditional expressions corresponding to the respective examples are shown below.
Conditional expression/Example ex1 ex2 ex3 ex4
(1) 0.35<G2at/G2t<0.80 0.70 0.70 0.39 0.69
(2) 1.40<G2af/G2f<4.40 2.93 2.92 1.70 2.94
(3) 0.19<f4/ft<0.75 0.42 0.42 0.51 0.27
(4) 1.20<MR^2×(1-M4^2)<6.00 2.18 1.92 1.89 3.39
(5) 0.15<M4<0.80 0.50 0.54 0.56 0.32
(6) -0.85<F5/ft<-0.15 -0.30 -0.61 -0.33 -0.21
(7) See below -4.41 -3.47 -1.40 -5.10
* Conditional expression (7) −7.50<(G2a2+G2a1)/(G2a2-G2a1)<−1.05
G1 第1レンズ群
G2 第2レンズ群
G2a 第2aレンズ群
G2b 第2bレンズ群
G3 第3レンズ群
G4 第4レンズ群
G5 第5レンズ群
G5a 第5aレンズ群
G5b 第5bレンズ群
S 開口絞り
F フィルター
I 像面
G1 1st lens group G2 2nd lens group G2a 2a lens group G2b 2b lens group G3 3rd lens group G4 4th lens group G5 5th lens group G5a 5a lens group G5b 5b lens group S aperture stop F filter I image plane
Claims (6)
変倍時に、前記第1レンズ群と前記第5レンズ群とが像面に対し固定であり、
無限遠物体から近距離物体へのフォーカシングに際して、前記第4レンズ群が光軸に沿って物体側に移動することを特徴とする変倍結像光学系 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 the fourth lens group having a positive refractive power. And a fifth lens unit having a negative refractive power,
At the time of zooming, the first lens group and the fifth lens group are fixed with respect to the image plane,
A variable power imaging optical system, wherein the fourth lens group moves toward the object side along the optical axis when focusing from an object at infinity to a near object.
前記第2aレンズ群と前記第2bレンズ群の空気間隔が前記第2レンズ群を構成する空気間隔の内、最も大きくなり、
前記第2aレンズ群の焦点距離と前記第2レンズ群の焦点距離が以下の条件式を満足することを特徴とする請求項1に記載の変倍結像光学系。
(1)0.35<G2at/G2t<0.80
(2)1.40<G2af/G2f<4.40
ただし
G2t:前記第2レンズ群の合成厚
G2at:前記第2aレンズ群と前記第2bレンズ群に挟まれた空気間隔
G2f:前記第2レンズ群の焦点距離
G2af:第2aレンズ群の焦点距離 The second lens group comprises, in order from the object side to the image side, a second lens group consisting of a negative single lens convex to the object side and a second lens group having a negative refractive power,
The air distance between the second-a lens group and the second-b lens group is the largest of the air distances forming the second lens group,
2. The variable power imaging optical system according to claim 1, wherein the focal length of the second-a lens unit and the focal length of the second-lens unit satisfy the following conditional expression.
(1) 0.35<G2at/G2t<0.80
(2) 1.40<G2af/G2f<4.40
However, G2t: combined thickness of the second lens group G2at: air gap between the 2a lens group and the 2b lens group G2f: focal length of the second lens group G2af: focal length of the 2a lens group
ただし
(3)0.19<f4/ft<0.75
(4)1.20<MR^2×(1−M4^2)<6.00
(5)0.15<M4<0.80
ft:望遠端における物体距離無限遠時の焦点距離
f4:前記第4レンズ群G4の焦点距離
M4:物体距離無限遠時の前記第4レンズ群G4の横倍率
MR:物体距離無限遠時の前記第5レンズ群G5の横倍率 The variable power imaging according to claim 1 or 2, wherein the fourth lens group moves toward an object at the time of focusing from an object at infinity to a near object, and satisfies the following conditional expression. Optical system.
However, (3) 0.19<f4/ft<0.75
(4) 1.20<MR^2*(1-M4^2)<6.00
(5) 0.15<M4<0.80
ft: focal length when the object distance is infinity at the telephoto end f4: focal length of the fourth lens group G4 M4: lateral magnification of the fourth lens group G4 when the object distance is infinity MR: the object distance at infinity Lateral magnification of fifth lens group G5
(6)−0.85<f5/ft<−0.15
ただし
f5:前記第5レンズ群の焦点距離
ft:望遠端における物体距離無限遠時の焦点距離 4. The variable power imaging optical system according to claim 1, wherein the fifth lens group satisfies the following conditional expression.
(6) -0.85<f5/ft<-0.15
Here, f5: focal length of the fifth lens group ft: object distance at the telephoto end, focal length at infinity
(7)−7.50<(G2a2+G2a1)/(G2a2−G2a1)<−1.05
ただし
G2a1:前記第2aレンズ群の物体側の曲率半径
G2a2:前記第2aレンズ群の像側の曲率半径 6. The variable power imaging optical system according to claim 2, wherein the second-a lens group satisfies the following conditional expression.
(7) −7.50<(G2a2+G2a1)/(G2a2-G2a1)<−1.05
Where G2a1 is the radius of curvature of the second lens group on the object side G2a2 is the radius of curvature of the second lens group on the image side
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CN113985589A (en) * | 2021-10-29 | 2022-01-28 | 中山联合光电科技股份有限公司 | Zoom lens and optical system |
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