JP5082431B2 - Magnification optical system having image stabilization function, imaging device, and magnifying method - Google Patents
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本発明は、防振機能を有する変倍光学系に関し、特に、写真用カメラや電子スチルカメラ、ビデオカメラ等に適した防振機能を有する変倍光学系、撮像装置、変倍光学系の変倍方法に関する。 The present invention relates to a variable magnification optical system having an image stabilization function, and in particular, a variable magnification optical system, an imaging apparatus, and a variable magnification optical system having an image stabilization function suitable for a photographic camera, an electronic still camera, a video camera, and the like. About the fold method.
従来、防振機能を有する変倍光学系が提案されている(例えば、特許文献1、および2)。
しかしながら、従来の防振機能を有する変倍光学系は変倍比が2倍程度であるため、高変倍比の要求を十分に満足できるものでは無いという問題があった。 However, the conventional variable magnification optical system having the image stabilization function has a problem that the variable magnification ratio is about two times, so that the requirement for a high variable magnification ratio cannot be sufficiently satisfied.
本発明は、上記問題点に鑑みてなされたものであり、防振機能、高変倍比を有する良好な光学性能を持った変倍光学系、撮像装置、変倍光学系の変倍方法の提供を目的とする。 The present invention has been made in view of the above-described problems, and is provided with a variable power optical system, an image pickup apparatus, and a variable power method for a variable power optical system having an anti-vibration function and good optical performance with a high variable power ratio. For the purpose of provision.
上記課題を解決するため、本発明は、物体側から順に、負の屈折力を持つ第1レンズ群と、正の屈折力を持つ第2レンズ群と、負の屈折力を持つ第3レンズ群と、正の屈折力を持つ第4レンズ群の実質的に4個のレンズ群からなり、広角端状態から望遠端状態まで変倍を行う際に、前記第2レンズ群と前記第3レンズ群との間隔が変化し、前記第3レンズ群と前記第4レンズ群との間隔が変化するようにレンズ群が移動し、前記第3レンズ群の少なくとも一部を光軸と直交方向にシフトさせることで像ブレ発生時の像面補正を行う防振レンズ群とし、前記防振レンズ群は少なくとも1つ以上の非球面を有し、下記の条件式を満足することを特徴とする防振機能を有する変倍光学系を提供する。
1.52 ≦ f2/fw < 2.50
−2.10 < f3/fw ≦ −2.04
ただし、
f2:第2レンズ群の焦点距離、
f3:第3レンズ群の焦点距離、
fw:広角端での焦点距離。
また、本発明は、物体側から順に、負の屈折力を持つ第1レンズ群と、正の屈折力を持つ第2レンズ群と、負の屈折力を持つ第3レンズ群と、正の屈折力を持つ第4レンズ群の実質的に4個のレンズ群からなり、広角端状態から望遠端状態まで変倍を行う際に、前記第2レンズ群と前記第3レンズ群との間隔が変化し、前記第3レンズ群と前記第4レンズ群との間隔が変化するようにレンズ群が移動し、前記第3レンズ群の少なくとも一部を光軸と直交方向にシフトさせることで像ブレ発生時の像面補正を行う防振レンズ群とし、前記防振レンズ群は少なくとも1つ以上の非球面を有し、前記第1レンズ群は、3枚以下のレンズで構成され、少なくとも1つ以上の非球面を有し、前記第4レンズ群は、3枚以下のレンズで構成され、少なくとも1つの非球面を有し、下記の条件式を満足することを特徴とする防振機能を有する変倍光学系を提供する。
1.52 ≦ f2/fw < 2.50
−2.10 < f3/fw <−0.80
ただし、
f2:第2レンズ群の焦点距離、
f3:第3レンズ群の焦点距離、
fw:広角端での焦点距離。
In order to solve the above-described problems, the present invention provides, in order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a negative refractive power. And the fourth lens group having a positive refractive power, and the second lens group and the third lens group when zooming from the wide-angle end state to the telephoto end state. And the lens group is moved so that the distance between the third lens group and the fourth lens group changes, and at least a part of the third lens group is shifted in a direction orthogonal to the optical axis. An anti-vibration lens group that performs image plane correction when an image blur occurs, and the anti-vibration lens group has at least one aspheric surface and satisfies the following conditional expression: A variable magnification optical system is provided.
1.52 ≦ f2 / fw <2.50
-2.10 <f3 / fw ≦ −2.04
However,
f2: focal length of the second lens group,
f3: focal length of the third lens group,
fw: focal length at the wide-angle end.
Further, according to the present invention, in order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a positive refraction. The fourth lens group having power substantially consists of four lens groups. When zooming from the wide-angle end state to the telephoto end state, the distance between the second lens group and the third lens group changes. Then, the lens group moves so that the distance between the third lens group and the fourth lens group changes, and at least a part of the third lens group is shifted in a direction orthogonal to the optical axis, thereby generating image blurring. An anti-vibration lens group that performs image surface correction at the time, the anti-vibration lens group has at least one aspheric surface, and the first lens group includes three or less lenses, and at least one or more has an aspheric surface of the fourth lens group is composed of three or less lenses, less the Having one aspheric surface, to provide a variable magnification optical system having a vibration reduction function that satisfies the following conditional expression.
1.52 ≦ f2 / fw <2.50
-2.10 <f3 / fw <-0.80
However,
f2: focal length of the second lens group,
f3: focal length of the third lens group,
fw: focal length at the wide-angle end.
また、本発明は、本発明に係る防振機能を有する変倍光学系を備えた撮像装置を提供する。 In addition, the present invention provides an imaging apparatus including a variable magnification optical system having a vibration isolation function according to the present invention.
本発明によれば、防振機能、高変倍比を有する良好な光学性能を持った変倍光学系、撮像装置、変倍光学系の変倍方法を提供することができる。 According to the present invention, it is possible to provide a variable magnification optical system, an image pickup apparatus, and a variable magnification method for the variable magnification optical system, which have an anti-vibration function and good optical performance with a high variable magnification ratio.
以下、本願の実施形態に係る防振機能を有する変倍光学系について説明する。 Hereinafter, a variable magnification optical system having an image stabilization function according to an embodiment of the present application will be described.
本実施形態に係る防振機能を有する変倍光学系は、物体側から順に、負の屈折力を持つ第1レンズ群と、正の屈折力を持つ第2レンズ群と、負の屈折力を持つ第3レンズ群と、正の屈折力を持つ第4レンズ群を有し、広角端状態から望遠端状態まで変倍を行う際に、前記第2レンズ群と前記第3レンズ群との間隔が変化し、前記第3レンズ群と前記第4レンズ群との間隔が変化するようにレンズ群が移動し、前記第3レンズ群の少なくとも一部を光軸と直交方向にシフトさせることで像ブレ発生時の像面補正を行う防振レンズ群とし、前記防振レンズ群は少なくとも1つ以上の非球面を有し、下記の条件式(1)、および(2)を満足することを特徴とする。
(1) 1.20 < f2/fw < 2.50
(2) −2.10 < f3/fw <−0.80
ただし、
f2:前記第2レンズ群の焦点距離
f3:前記第3レンズ群の焦点距離
fw:広角端状態における全系の焦点距離
条件式(1)は、第2レンズ群の屈折力を規定したものであり、これによって、所定の変倍比を効果的に確保し、良好な光学性能を確保しながら、防振時にも良好な光学性能を実現している。
The variable magnification optical system having the image stabilization function according to this embodiment includes, in order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a negative refractive power. A third lens group having a positive refractive power, and a distance between the second lens group and the third lens group when zooming is performed from the wide-angle end state to the telephoto end state. Changes, the lens group moves so that the distance between the third lens group and the fourth lens group changes, and at least a part of the third lens group is shifted in a direction orthogonal to the optical axis, thereby generating An anti-vibration lens group that performs image surface correction when blurring occurs, the anti-vibration lens group has at least one aspheric surface, and satisfies the following conditional expressions (1) and (2): And
(1) 1.20 <f2 / fw <2.50
(2) -2.10 <f3 / fw <-0.80
However,
f2: focal length of the second lens group f3: focal length of the third lens group fw: focal length of the entire system in the wide-angle end state Conditional expression (1) defines the refractive power of the second lens group. With this, a predetermined zoom ratio is effectively secured, and good optical performance is achieved even during vibration isolation while ensuring good optical performance.
条件式(1)の下限値を下回ると第2レンズ群の屈折力が強くなりすぎ、防振時の偏心収差、すなわちコマ収差または非点収差が悪化してしまう。また、条件式(1)の上限値を超えると第2レンズ群の屈折力が弱くなりすぎ、変倍時に各群の移動量が増加し、広角端状態から望遠端状態までの変倍の際に、像面湾曲収差や色収差の補正が困難になる。なお、本願の効果を確実にするためには、条件式(1)の上限値を1.80にすることが望ましい。また、本願の効果を確実にするためには、条件式(1)の下限値を1.30にすることが望ましい。 If the lower limit value of conditional expression (1) is not reached, the refractive power of the second lens group becomes too strong, and decentration aberrations during image stabilization, that is, coma aberration or astigmatism will deteriorate. If the upper limit of conditional expression (1) is exceeded, the refractive power of the second lens group becomes too weak, and the amount of movement of each group increases during zooming, and zooming from the wide-angle end state to the telephoto end state is performed. In addition, it becomes difficult to correct field curvature aberration and chromatic aberration. In order to secure the effect of the present application, it is desirable to set the upper limit of conditional expression (1) to 1.80. In order to secure the effect of the present application, it is desirable to set the lower limit of conditional expression (1) to 1.30.
条件式(2)は第3レンズ群の屈折力を規定したものであり、これにより、所定の変倍比を効果的に確保しつつ、防振時にも良好な光学性能を実現している。 Conditional expression (2) defines the refracting power of the third lens group, thereby realizing a good optical performance even during image stabilization while effectively securing a predetermined zoom ratio.
条件式(2)の下限値を下回ると第3レンズ群の屈折力が弱くなり過ぎて、変倍時の第3レンズ群の移動量が増加するので、変倍時の像面湾曲収差の変動が大きくなり、この補正が困難になる。また、条件式(2)の上限値を超えると第3レンズ群の屈折力が強くなり過ぎて、防振時の偏心収差、特に球面収差が悪化してしまう。なお、本発明の効果をさらに確実にするためには、条件式(2)の下限値を−1.50にすることが望ましい。 If the lower limit value of conditional expression (2) is not reached, the refractive power of the third lens group becomes too weak and the amount of movement of the third lens group at the time of zooming increases, so that the variation in field curvature at the time of zooming varies. Becomes larger and this correction becomes difficult. If the upper limit of conditional expression (2) is exceeded, the refractive power of the third lens group becomes too strong, and decentration aberrations, particularly spherical aberrations, during image stabilization are deteriorated. In order to further secure the effect of the present invention, it is desirable to set the lower limit of conditional expression (2) to -1.50.
また、前記第2レンズ群と前記第3レンズ群との間隔が増大し、前記第3レンズ群と前記第4レンズ群との間隔が減少することにより、高変倍比を達成することができ、変倍時の球面収差の変動を少なくすることができるので好ましい。 In addition, a high zoom ratio can be achieved by increasing the distance between the second lens group and the third lens group and decreasing the distance between the third lens group and the fourth lens group. This is preferable because the variation of spherical aberration during zooming can be reduced.
また、前記第3レンズ群中の少なくとも1つの非球面は、近軸曲率半径を有する球面に比べて光軸から周辺に向かって正の屈折力が強くなるか、あるいは負の屈折力が弱くなるように形成された形状で、さらに以下の条件式を満足することを特徴とする。
(3) 0.00001<|ASPd0.5|/(H/2)<0.01
(4) 0.0001<|ASPd1.0|/(H/2)<0.01
(5) |ASPd0.5|/|ASPd1.0|<1
ただし、Hは非球面レンズの有効径、ASPd0.5は非球面有効径の5割の高さにおける近軸曲率半径と非球面形状との偏差量、ASPd1.0は非球面有効径の10割の高さにおける近軸曲率半径と非球面形状との偏差量を示す。
In addition, at least one aspheric surface in the third lens group has a positive refracting power or a negative refracting power that is stronger from the optical axis toward the periphery than a spherical surface having a paraxial radius of curvature. The shape thus formed further satisfies the following conditional expression.
(3) 0.00001 <| ASPd0.5 | / (H / 2) <0.01
(4) 0.0001 <| ASPd1.0 | / (H / 2) <0.01
(5) | ASPd0.5 | / | ASPd1.0 | <1
Where H is the effective diameter of the aspherical lens, ASPd0.5 is the deviation between the paraxial curvature radius and the aspherical shape at 50% of the aspherical effective diameter, and ASPd1.0 is 100% of the effective aspherical diameter. The amount of deviation between the paraxial radius of curvature and the aspherical shape at the height of.
条件式(3)、(4)、(5)は、防振レンズ群である第3レンズ群を光軸と直交方向に移動した際の結像性能の劣化を小さく抑える為の非球面形状を規定する。条件式(3)及び条件式(4)の下限値を越えると非球面の補正効果を発揮出来ず、諸収差補正の為にレンズ枚数が増加し望ましくない。または、コマ収差が悪化するので望ましくない。条件式(3)及び条件式(4)の上限値を越えると球面収差など諸収差の補正が過剰になりすぎ、同時に防振レンズを移動させた際の結像性能の劣化をまねく。また、前記非球面は近軸曲率半径を有する球面に比べて光軸から周辺に向かって正の屈折力が徐々に強くなるか、あるいは負の屈折力が弱くなるように形成された構成によって、防振用レンズが移動の際、軸上光束及び軸外光束の諸収差を効率良く補正できる。条件式(5)の上限値を越えると防振レンズを移動させる際に防振レンズ群内で球面収差、およびコマ収差の高次の収差が発生し、移動後の結像性能の劣化を招く事となる。 Conditional expressions (3), (4), and (5) are aspherical shapes for minimizing degradation of imaging performance when the third lens group, which is an anti-vibration lens group, is moved in a direction orthogonal to the optical axis. Stipulate. If the lower limit values of the conditional expressions (3) and (4) are exceeded, the effect of correcting the aspherical surface cannot be achieved, and the number of lenses increases for correcting various aberrations. Or, it is not desirable because coma becomes worse. If the upper limit values of the conditional expressions (3) and (4) are exceeded, correction of various aberrations such as spherical aberration becomes excessive, and at the same time, the imaging performance is deteriorated when the vibration-proof lens is moved. Further, the aspherical surface is configured such that the positive refractive power gradually increases from the optical axis toward the periphery as compared with the spherical surface having a paraxial radius of curvature, or the negative refractive power is weakened. When the vibration-proof lens moves, various aberrations of the on-axis light beam and off-axis light beam can be corrected efficiently. If the upper limit value of conditional expression (5) is exceeded, high-order aberrations such as spherical aberration and coma aberration occur in the anti-vibration lens group when the anti-vibration lens is moved, and the imaging performance after the movement is deteriorated. It will be a thing.
また、本防振機能を有する変倍光学系では、第3レンズ群に接合レンズを有することが望ましい。このような構成にすることで、防振時の倍率色収差を良好に保つことができる。 In the variable magnification optical system having the present image stabilization function, it is desirable to have a cemented lens in the third lens group. By adopting such a configuration, it is possible to maintain good lateral chromatic aberration during image stabilization.
また、本防振機能を有する変倍光学系では、前記第1レンズ群は少なくとも1つの非球面を有し、3枚以下のレンズで構成されていることが望ましい。このような構成にする事でレンズ全長を短縮させ、かつ像面湾曲を良好に補正できる。 In the variable magnification optical system having the present image stabilization function, it is desirable that the first lens group has at least one aspheric surface and is constituted by three or less lenses. By adopting such a configuration, the overall lens length can be shortened, and the curvature of field can be favorably corrected.
また、本防振機能を有する変倍光学系では、前記第1レンズ群の最も物体側のレンズは像側面に非球面を配した負レンズで構成されていることが望ましい。このような構成にする事で像面湾曲と広角側のコマ収差を良好に補正できる。 In the variable magnification optical system having the present image stabilizing function, it is desirable that the lens closest to the object side in the first lens group is a negative lens having an aspheric surface on the image side surface. With such a configuration, it is possible to satisfactorily correct field curvature and wide-angle coma.
また、本防振機能を有する変倍光学系では、前記第4レンズ群は3枚以下のレンズで構成され、少なくとも1つの非球面を有していることが望ましい。このような構成にする事でレンズ全長を短縮させ、かつコマ収差を良好に補正できる。 In the variable magnification optical system having the present image stabilization function, it is desirable that the fourth lens group is composed of three or less lenses and has at least one aspherical surface. With such a configuration, the total lens length can be shortened, and coma can be corrected well.
また、本防振機能を有する変倍光学系では、前記第2レンズ群から第4レンズ群の各群に少なくとも1つの接合レンズを有することが望ましい。このような構成にする事で変倍時に発生する色収差、特に倍率色収差を良好に保つことができる。 In the variable magnification optical system having the present image stabilization function, it is desirable that each of the second lens group to the fourth lens group has at least one cemented lens. With such a configuration, it is possible to maintain good chromatic aberration, particularly lateral chromatic aberration, that occurs during zooming.
また、本防振機能を有する変倍光学系では、最も像面側のレンズ面が像面に向かって凸面となることが望ましい。このような構成にすることで、像面湾曲が良好に補正され、像面からの反射光によるゴーストを軽減することが可能となる。 In the variable magnification optical system having the image stabilization function, it is desirable that the lens surface closest to the image surface is convex toward the image surface. With such a configuration, curvature of field can be corrected well, and ghosts caused by reflected light from the image surface can be reduced.
また、前記第3レンズ群の近傍に開口絞りを配置することで球面収差等の諸収差が良好に補正できる。 Further, by arranging an aperture stop in the vicinity of the third lens group, various aberrations such as spherical aberration can be favorably corrected.
また、前記開口絞りは、広角端状態から望遠端状態への変倍を行う際に、前記第3レンズ群と一体に移動することで、変倍時に球面収差等の諸収差の変動を少なくすることができる。 The aperture stop moves integrally with the third lens group when zooming from the wide-angle end state to the telephoto end state, thereby reducing variations in various aberrations such as spherical aberration during zooming. be able to.
以下、各数値実施例に係る防振機能を有する変倍光学系を添付図面に基づいて説明する。なお、以降の記載において、第1実施例を参考例、第2実施例を第1実施例、第3実施例を第2実施例と読み替えることとする。 Hereinafter, a variable magnification optical system having an image stabilization function according to each numerical example will be described with reference to the accompanying drawings. In the following description, the first embodiment will be read as a reference example, the second embodiment as a first embodiment, and the third embodiment as a second embodiment.
(第1実施例)
図1は、第1実施例に係る防振機能を有する変倍光学系の広角端状態におけるレンズ構成を示す断面図である。
(First embodiment)
FIG. 1 is a cross-sectional view showing a lens configuration in a wide-angle end state of a variable magnification optical system having an image stabilization function according to the first example.
第1実施例に係る防振機能を有する変倍光学系は、図1に示すように、物体側より順に、負の屈折力を持つ第1レンズ群G1、正の屈折力を持つ第2レンズ群G2、開口絞りSP、負の屈折力を持つ第3レンズ群G3、正の屈折力を持つ第4レンズ群G4で構成されている。 As shown in FIG. 1, the variable magnification optical system according to the first example includes a first lens group G1 having a negative refractive power and a second lens having a positive refractive power in order from the object side. It includes a group G2, an aperture stop SP, a third lens group G3 having a negative refractive power, and a fourth lens group G4 having a positive refractive power.
第1レンズ群G1は、物体側より順に、物体側に凸面を向けた負メニスカスレンズと、両凹形状の負レンズと、物体側に凸面を向けた正メニスカスレンズとからなり、最も物体側の負メニスカスレンズは像面I側のガラスレンズ面に樹脂層を設けて非球面を形成した非球面レンズである。 The first lens group G1 includes, in order from the object side, a negative meniscus lens having a convex surface facing the object side, a biconcave negative lens, and a positive meniscus lens having a convex surface facing the object side. The negative meniscus lens is an aspherical lens in which an aspherical surface is formed by providing a resin layer on the glass lens surface on the image plane I side.
第2レンズ群G2は、物体側より順に、物体側に凸面を向けた負メニスカスレンズと両凸形状の正レンズとの接合レンズと、物体側に凸面を向けた正メニスカスレンズとからなる。 The second lens group G2 includes, in order from the object side, a cemented lens of a negative meniscus lens having a convex surface facing the object side and a biconvex positive lens, and a positive meniscus lens having a convex surface facing the object side.
第3レンズ群G3は、物体側より順に、物体側に凹面を向けた正メニスカスレンズと両凹形状の負レンズとの接合レンズからなる。 The third lens group G3 is composed of a cemented lens of a positive meniscus lens having a concave surface directed toward the object side and a biconcave negative lens in order from the object side.
第4レンズ群G4は、物体側より順に、両凸形状の正レンズと、両凸形状の正レンズと像面I側に凸面を向けた負メニスカスレンズとの接合レンズとからなる。 The fourth lens group G4 is composed of, in order from the object side, a biconvex positive lens, and a cemented lens of a biconvex positive lens and a negative meniscus lens having a convex surface directed to the image plane I side.
開口絞りSPは、第2レンズ群G2と第3レンズ群G3との間に配置され、広角端状態から望遠端状態への変倍の際に、第3レンズ群G3と共に移動する。 The aperture stop SP is disposed between the second lens group G2 and the third lens group G3, and moves together with the third lens group G3 when zooming from the wide-angle end state to the telephoto end state.
広角端状態から望遠端状態への変倍の際に、第1レンズ群G1は像面Iに向かって凸の軌跡で移動し、第2レンズ群G2、第3レンズ群G3、第4レンズ群G4は物体側に移動する。 During zooming from the wide-angle end state to the telephoto end state, the first lens group G1 moves along a convex locus toward the image plane I, and the second lens group G2, the third lens group G3, and the fourth lens group. G4 moves to the object side.
また、本実施例に係る防振機能を有する変倍光学系では、第3レンズ群G3を光軸と直交する方向にシフトさせることで撮影画像のブレを補正している。 Further, in the variable magnification optical system having the image stabilization function according to the present embodiment, the blur of the photographed image is corrected by shifting the third lens group G3 in the direction orthogonal to the optical axis.
また、変倍光学系全系の焦点距離がfで、防振係数(手ブレ補正時の防振レンズ群の移動量に対する結像面I上での像の移動量の比)をKとするとき、角度θの回転ブレを補正するには、手ブレ補正用のレンズ群を(f・tanθ)/Kだけ光軸と直交方向に移動させればよい。本第1実施例の広角端状態において、防振係数Kは1.155であり、焦点距離は18.7(mm)であるので、0.731°の回転ブレを補正するための第3レンズ群の移動量は0.207(mm)である。本実施例の望遠端状態において、防振係数Kは1.845であり、焦点距離は53.3(mm)であるので、0.433°の回転ブレを補正するための第3レンズ群の移動量は0.218(mm)である。 The focal length of the entire zoom optical system is f, and the image stabilization coefficient (the ratio of the image movement amount on the image plane I to the movement amount of the image stabilization lens group during camera shake correction) is K. At this time, in order to correct the rotational shake of the angle θ, the camera shake correction lens group may be moved in the direction orthogonal to the optical axis by (f · tan θ) / K. In the first embodiment, in the wide-angle end state, the image stabilization coefficient K is 1.155 and the focal length is 18.7 (mm). Therefore, the third lens for correcting the rotation blur of 0.731 °. The amount of movement of the group is 0.207 (mm). In the telephoto end state of this embodiment, the image stabilization coefficient K is 1.845, and the focal length is 53.3 (mm). Therefore, the third lens group for correcting the rotational blur of 0.433 ° is used. The amount of movement is 0.218 (mm).
以下の表1に、第1実施例に係る防振機能を有する変倍光学系の諸元値を示す。
[全体諸元]において、fは焦点距離、FNOはFナンバー、Wは広角端状態、Mは中間焦点距離状態、Tは望遠端状態を表す。[レンズデータ]において、第1列Nは物体側から数えたレンズ面の順番、第2列rはレンズ面の曲率半径、第3列dはレンズ面の間隔、第4列νdはd線(波長λ=587.6nm)に対するアッベ数、第5列ndはd線(波長λ=587.6nm)に対する屈折率を表す。また、r=0.000は平面を表し、Bfはバックフォーカスを示し、空気の屈折率nd=1.0000は、その記載を省略する。
[非球面データ]には、面番号N、非球面の形状を次式で表した場合の非球面係数、円錐定数を表す。
x=(h2/r)/[1+{1−κ(h/r)2}1/2]+C4h4+C6h6+C8h8+C10h10+C12h12
Table 1 below shows specification values of the variable magnification optical system having the image stabilization function according to the first example.
In [Overall Specifications], f represents a focal length, FNO represents an F number, W represents a wide-angle end state, M represents an intermediate focal length state, and T represents a telephoto end state. In [Lens data], the first column N is the order of the lens surfaces counted from the object side, the second column r is the radius of curvature of the lens surfaces, the third column d is the distance between the lens surfaces, and the fourth column νd is the d line ( The Abbe number for the wavelength λ = 587.6 nm) and the fifth column nd represent the refractive index for the d-line (wavelength λ = 587.6 nm). Further, r = 0.000 represents a plane, Bf represents back focus, and the refractive index nd = 1.0000 of air is omitted from the description.
[Aspherical data] represents the surface number N, the aspherical coefficient and the conic constant when the aspherical shape is expressed by the following equation.
x = (h 2 / r) / [1+ {1-κ (h / r) 2 } 1/2 ] + C4h 4 + C6h 6 + C8h 8 + C10h 10 + C12h 12
なお、xは、面の頂点を基準としたときの光軸からの高さhの位置での光軸方向の変位であり、κは円錐定数、C4、C6、C8、C10、C12は非球面係数であり、rは基準球面の曲率半径(近軸曲率半径)である。なお、「E−n」は「×10−n」を示し、例えば、「1.234E−05」は「1.234×10−5」を示す。[可変間隔データ]には、焦点距離fと、可変間隔の値を示す。[条件式対応値]は、各条件式の対応値を示す。 Note that x is the displacement in the optical axis direction at the position of the height h from the optical axis with respect to the vertex of the surface, κ is the conic constant, and C4, C6, C8, C10, and C12 are aspherical surfaces. R is a curvature radius (paraxial curvature radius) of the reference spherical surface. “E-n” indicates “× 10 −n ”, for example, “1.234E-05” indicates “1.234 × 10 −5 ”. [Variable interval data] indicates the focal length f and the value of the variable interval. [Conditional Expression Corresponding Value] indicates the corresponding value of each conditional expression.
なお、以下の全ての実施例の諸元値において、掲載されている焦点距離f、曲率半径r、面間隔d、その他の長さ等は、特記のない場合一般に「mm」が使われるが、光学系は、比例拡大又は比例縮小しても同等の光学性能が得られるので、これに限られるものではない。また、単位は「mm」に限定されること無く他の適当な単位を用いることもできる。さらに、これらの記号の説明は、以降の各実施例の諸元値においても同様とし、重複した説明を省略する。 In addition, in the specification values of all the following examples, “mm” is generally used as the focal length f, the radius of curvature r, the surface interval d, and other lengths, etc. unless otherwise specified. The optical system is not limited to this because an equivalent optical performance can be obtained even when proportional expansion or proportional reduction is performed. Further, the unit is not limited to “mm”, and other appropriate units may be used. Further, the description of these symbols is the same in the specification values of the following embodiments, and the duplicate description is omitted.
(表1)
[全体諸元]
W T
f= 18.7 53.3
FNO= 3.70 5.88
[レンズデータ]
N r d νd nd
1) 109.000 1.90 64.12 1.5168
2) 15.000 0.17 38.09 1.5539
3) 12.800 10.40
4) -95.070 1.70 61.18 1.5891
5) 36.608 0.40
6) 28.725 3.40 27.51 1.7552
7) 100.883 D7
8) 31.555 1.10 23.78 1.8467
9) 17.803 4.30 59.4 1.5400
10) -35.066 0.10
11) 23.456 2.30 70.45 1.4875
12) 56.371 D12
13) 0.000 2.60 開口絞りSP
14) -46.798 3.00 32.35 1.8503
15) -11.046 0.90 46.63 1.8160
16) 69.497 D16
17) 2543.571 3.20 64.12 1.5168
18) -25.206 0.10
19) 188.439 5.00 70.45 1.4875
20) -16.411 1.40 32.35 1.8503
21) -39.355 Bf
[非球面データ]
N= 3面
κ= 0
C4= 3.0295E-05
C6= 4.4581E-08
C8= 3.8221E-10
C10= -1.7489E-12
C12= 6.8147E-15
N= 14面
有効径H= 6.00
κ= 13.8934
C4= -2.9312E-05
C6= 2.4670E-08
C8= 0.0000E+00
C10= 0.0000E+00
C12= 0.0000E+00
N= 16面
有効径H= 6.49
κ= 12.5281
C4= -6.1184E-06
C6= -3.5034E-08
C8= 0.0000E+00
C10= 0.0000E+00
C12= 0.0000E+00
[可変間隔データ]
W M T
D7 31.87 9.65 2.18
D12 2.60 7.96 12.19
D16 16.54 11.18 6.95
Bf 37.67 54.02 72.46
[条件式対応値]
(1):f2/fW= 1.49
(2):f3/fW= -1.60
(3):|ASPd0.5|/(H/2)= 0.000307 (14面)
= 0.000391(16面)
(4):|ASPd1.0|/(H/2)= 0.00527 (14面)
= 0.00677 (16面)
(5):|ASPd0.5|/|ASPd1.0|= 0.058
(Table 1)
[Overall specifications]
W T
f = 18.7 53.3
FNO = 3.70 5.88
[Lens data]
N r d νd nd
1) 109.000 1.90 64.12 1.5168
2) 15.000 0.17 38.09 1.5539
3) 12.800 10.40
4) -95.070 1.70 61.18 1.5891
5) 36.608 0.40
6) 28.725 3.40 27.51 1.7552
7) 100.883 D7
8) 31.555 1.10 23.78 1.8467
9) 17.803 4.30 59.4 1.5400
10) -35.066 0.10
11) 23.456 2.30 70.45 1.4875
12) 56.371 D12
13) 0.000 2.60 Aperture stop SP
14) -46.798 3.00 32.35 1.8503
15) -11.046 0.90 46.63 1.8160
16) 69.497 D16
17) 2543.571 3.20 64.12 1.5168
18) -25.206 0.10
19) 188.439 5.00 70.45 1.4875
20) -16.411 1.40 32.35 1.8503
21) -39.355 Bf
[Aspherical data]
N = 3 sides κ = 0
C4 = 3.0295E-05
C6 = 4.4581E-08
C8 = 3.8221E-10
C10 = -1.7489E-12
C12 = 6.8147E-15
N = 14 faces Effective diameter H = 6.00
κ = 13.8934
C4 = -2.9312E-05
C6 = 2.4670E-08
C8 = 0.0000E + 00
C10 = 0.0000E + 00
C12 = 0.0000E + 00
N = 16 surfaces Effective diameter H = 6.49
κ = 12.5281
C4 = -6.1184E-06
C6 = -3.5034E-08
C8 = 0.0000E + 00
C10 = 0.0000E + 00
C12 = 0.0000E + 00
[Variable interval data]
W M T
D7 31.87 9.65 2.18
D12 2.60 7.96 12.19
D16 16.54 11.18 6.95
Bf 37.67 54.02 72.46
[Conditional expression values]
(1): f2 / fW = 1.49
(2): f3 / fW = -1.60
(3): | ASPd0.5 | / (H / 2) = 0.000307 (14 faces)
= 0.000391 (16 faces)
(4): | ASPd1.0 | / (H / 2) = 0.00527 (14th surface)
= 0.00677 (16 sides)
(5): | ASPd0.5 | / | ASPd1.0 | = 0.058
図2は、第1実施例に係る防振機能を有する変倍光学系の無限遠合焦時の広角端状態における収差図を示し、(a)は画像ブレ補正をおこなわない状態での諸収差図を、(b)は画像ブレ補正をおこなった時のメリディオナル横収差図を示す。図3は、第1実施例に係る防振機能を有する変倍光学系の無限遠合焦時の中間焦点距離状態での諸収差図を示す。図4は、第1実施例に係る防振機能を有する変倍光学系の無限遠合焦時の望遠端状態における収差図を示し、(a)は画像ブレ補正をおこなわない状態での諸収差図を、(b)は画像ブレ補正をおこなった時のメリディオナル横収差図を示す。 FIG. 2 is an aberration diagram in the wide-angle end state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the first example. FIG. 2A illustrates various aberrations in a state where image blur correction is not performed. FIG. 4B shows a meridional transverse aberration diagram when image blur correction is performed. FIG. 3 shows various aberration diagrams in the intermediate focal length state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the first example. FIG. 4 is an aberration diagram in the telephoto end state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the first example. FIG. 4A shows various aberrations in a state where image blur correction is not performed. FIG. 4B shows a meridional transverse aberration diagram when image blur correction is performed.
各収差図においてFNOはFナンバー、Yは像高、dはd線(波長λ=587.6nm)、およびgはg線(波長λ=435.8nm)をそれぞれ示す。なお、これらの符号は、以降の他の実施例においても同様であり、重複する説明を省略する。 In each aberration diagram, FNO is the F number, Y is the image height, d is the d-line (wavelength λ = 587.6 nm), and g is the g-line (wavelength λ = 435.8 nm). Note that these symbols are the same in the following other embodiments, and redundant description is omitted.
各諸収差図より第1実施例に係る防振機能を有する変倍光学系は、広角端状態から望遠端状態にわたって諸収差を良好に補正し、優れた結像性能を有していることがわかる。 From the various aberration diagrams, the variable magnification optical system having the anti-vibration function according to the first example is excellent in correcting various aberrations from the wide-angle end state to the telephoto end state and having excellent imaging performance. Recognize.
(第2実施例)
図5は、第2実施例に係る防振機能を有する変倍光学系の広角端状態におけるレンズ構成を示す断面図である。
(Second embodiment)
FIG. 5 is a cross-sectional view illustrating a lens configuration in the wide-angle end state of the variable magnification optical system having the image stabilization function according to the second example.
第2実施例に係る防振機能を有する変倍光学系は、図5に示すように、物体側より順に、負の屈折力を持つ第1レンズ群G1、正の屈折力を持つ第2レンズ群G2、開口絞りSP、負の屈折力を持つ第3レンズ群G3、正の屈折力を持つ第4レンズ群G4で構成されている。 As shown in FIG. 5 , the variable magnification optical system according to the second example has a first lens group G1 having negative refractive power and a second lens having positive refractive power in order from the object side. It includes a group G2, an aperture stop SP, a third lens group G3 having a negative refractive power, and a fourth lens group G4 having a positive refractive power.
第1レンズ群G1は、物体側より順に、物体側に凸面を向けた負メニスカスレンズと、両凹形状の負レンズと、物体側に凸面を向けた正メニスカスレンズとからなり、最も物体側の負メニスカスレンズは像面I側のガラスレンズ面に樹脂層を設けて非球面を形成した非球面レンズである。 The first lens group G1 includes, in order from the object side, a negative meniscus lens having a convex surface facing the object side, a biconcave negative lens, and a positive meniscus lens having a convex surface facing the object side. The negative meniscus lens is an aspherical lens in which an aspherical surface is formed by providing a resin layer on the glass lens surface on the image plane I side.
第2レンズ群G2は、物体側より順に、両凸形状の正レンズと、両凸形状の正レンズと両凹形状の負レンズとの接合レンズとからなる。 The second lens group G2 includes, in order from the object side, a biconvex positive lens, and a cemented lens of a biconvex positive lens and a biconcave negative lens.
第3レンズ群G3は、物体側より順に、物体側に凹面を向けた正メニスカスレンズと両凹形状の負レンズとの接合レンズからなる。 The third lens group G3 is composed of a cemented lens of a positive meniscus lens having a concave surface directed toward the object side and a biconcave negative lens in order from the object side.
第4レンズ群G4は、両凸形状の正レンズと像面I側に凸面を向けた負メニスカスレンズとの接合レンズからなり、接合レンズは物体側のガラスレンズ面に樹脂層を設けて非球面を形成した非球面レンズである。 The fourth lens group G4 includes a cemented lens of a biconvex positive lens and a negative meniscus lens having a convex surface directed toward the image plane I. The cemented lens is aspherical by providing a resin layer on the glass lens surface on the object side. Is an aspheric lens.
開口絞りSPは、第2レンズ群G2と第3レンズ群G3との間に位置し、広角端状態Wから望遠端状態Tへの変倍の際に、第3レンズ群G3と共に移動する。 The aperture stop SP is located between the second lens group G2 and the third lens group G3, and moves together with the third lens group G3 when zooming from the wide-angle end state W to the telephoto end state T.
広角端状態Wから望遠端状態Tへの変倍の際、第1レンズ群G1は像面Iに向かって凸の軌跡で移動し、第2レンズ群G2、第3レンズ群G3、第4レンズ群G4は物体側に移動する。 During zooming from the wide-angle end state W to the telephoto end state T, the first lens group G1 moves along a convex locus toward the image plane I, and the second lens group G2, the third lens group G3, and the fourth lens. Group G4 moves to the object side.
また、変倍光学系全系の焦点距離がfで、防振係数(手ブレ補正時の防振レンズ群の移動量に対する結像面I上での像の移動量の比)をKとするとき、角度θの回転ブレを補正するには、手ブレ補正用のレンズ群を(f・tanθ)/Kだけ光軸と直交方向に移動させればよい。本第2実施例の広角端状態において、防振係数Kは1.024であり、焦点距離は19.0(mm)であるので、0.725°の回転ブレを補正するための第3レンズ群の移動量は0.234(mm)である。本実施例の望遠端状態において、防振係数Kは1.785であり、焦点距離は54.0(mm)であるので、0.430°の回転ブレを補正するための第3レンズ群の移動量は0.227(mm)である。 The focal length of the entire zoom optical system is f, and the image stabilization coefficient (the ratio of the image movement amount on the image plane I to the movement amount of the image stabilization lens group during camera shake correction) is K. At this time, in order to correct the rotational shake of the angle θ, the camera shake correction lens group may be moved in the direction orthogonal to the optical axis by (f · tan θ) / K. In the wide-angle end state of the second embodiment, the image stabilization coefficient K is 1.024, and the focal length is 19.0 (mm). Therefore, the third lens for correcting rotational blur of 0.725 °. The amount of movement of the group is 0.234 (mm). In the telephoto end state of the present embodiment, since the image stabilization coefficient K is 1.785 and the focal length is 54.0 (mm), the third lens group for correcting the rotation blur of 0.430 ° is used. The amount of movement is 0.227 (mm).
以下の表2に、第2実施例に係る防振機能を有する変倍光学系の諸元値を示す。
(表2)
[全体諸元]
W T
f= 19.0 54.0
FNO= 3.65 5.88
[レンズデータ]
N r d νd nd
1) 110.000 1.70 64.12 1.5168
2) 17.200 0.10 38.09 1.5539
3) 14.913 9.50
4) -97.315 1.00 64.12 1.5168
5) 36.219 1.00
6) 33.516 2.90 27.51 1.7552
7) 114.806 D7
8) 35.379 3.00 64.12 1.5168
9) -40.809 0.10
10) 25.811 3.50 64.12 1.5168
11) -29.800 1.00 35.04 1.7495
12) 82.862 D12
13) 0.000 1.78 開口絞りSP
14) -46.332 2.00 32.35 1.8503
15) -14.027 1.00 46.58 1.8040
16) 62.280 D16
17) 69.419 0.07 38.09 1.5539
18) 69.419 5.50 65.47 1.6030
19) -14.809 1.50 25.43 1.8052
20) -22.287 Bf
[非球面データ]
N= 3面
κ= 0
C4= 1.6377E-05
C6= 2.4342E-08
C8= -1.5364E-11
C10= 2.1684E-13
N= 16面
有効径H= 5.56
κ= 17.882
C4= -1.1191E-05
C6= 0.0000E+00
C8= 0.0000E+00
C10= 0.0000E+00
N= 17面
κ= 32.566
C4= -3.2797E-05
C6= -6.0249E-08
C8= 9.8569E-10
C10= -1.0180E-11
[可変間隔データ]
W M T
D7 28.74 9.04 1.72
D12 3.64 9.50 15.34
D16 12.59 6.73 0.89
Bf 39.37 51.65 68.44
[条件式対応値]
(1):f2/fW= 1.52
(2):f3/fW= -1.88
(3):|ASPd0.5|/(H/2)= 0.0000492
(4):|ASPd1.0|/(H/2)= 0.000604
(5):|ASPd0.5|/|ASPd1.0|= 0.081
Table 2 below shows specification values of the variable magnification optical system having the image stabilization function according to the second example.
(Table 2)
[Overall specifications]
W T
f = 19.0 54.0
FNO = 3.65 5.88
[Lens data]
N r d νd nd
1) 110.000 1.70 64.12 1.5168
2) 17.200 0.10 38.09 1.5539
3) 14.913 9.50
4) -97.315 1.00 64.12 1.5168
5) 36.219 1.00
6) 33.516 2.90 27.51 1.7552
7) 114.806 D7
8) 35.379 3.00 64.12 1.5168
9) -40.809 0.10
10) 25.811 3.50 64.12 1.5168
11) -29.800 1.00 35.04 1.7495
12) 82.862 D12
13) 0.000 1.78 Aperture stop SP
14) -46.332 2.00 32.35 1.8503
15) -14.027 1.00 46.58 1.8040
16) 62.280 D16
17) 69.419 0.07 38.09 1.5539
18) 69.419 5.50 65.47 1.6030
19) -14.809 1.50 25.43 1.8052
20) -22.287 Bf
[Aspherical data]
N = 3 sides κ = 0
C4 = 1.6377E-05
C6 = 2.4342E-08
C8 = -1.5364E-11
C10 = 2.1684E-13
N = 16 faces Effective diameter H = 5.56
κ = 17.882
C4 = -1.1191E-05
C6 = 0.0000E + 00
C8 = 0.0000E + 00
C10 = 0.0000E + 00
N = 17 surface κ = 32.566
C4 = -3.2797E-05
C6 = -6.0249E-08
C8 = 9.8569E-10
C10 = -1.0180E-11
[Variable interval data]
W M T
D7 28.74 9.04 1.72
D12 3.64 9.50 15.34
D16 12.59 6.73 0.89
Bf 39.37 51.65 68.44
[Conditional expression values]
(1): f2 / fW = 1.52
(2): f3 / fW = -1.88
(3): | ASPd0.5 | / (H / 2) = 0.0000492
(4): | ASPd1.0 | / (H / 2) = 0.000604
(5): | ASPd0.5 | / | ASPd1.0 | = 0.081
図6は、第2実施例に係る防振機能を有する変倍光学系の無限遠合焦時の広角端状態における収差図を示し、(a)は画像ブレ補正をおこなわない状態での諸収差図を、(b)は画像ブレ補正をおこなった時のメリディオナル横収差図を示す。図7は、第2実施例に係る防振機能を有する変倍光学系の無限遠合焦時の中間焦点距離状態での諸収差図を示す。図8は、第2実施例に係る防振機能を有する変倍光学系の無限遠合焦時の望遠端状態における収差図を示し、(a)は画像ブレ補正をおこなわない状態での諸収差図を、(b)は画像ブレ補正をおこなった時のメリディオナル横収差図を示す。 FIG. 6 is an aberration diagram in the wide-angle end state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the second example, and FIG. 6A shows various aberrations in a state where image blur correction is not performed. FIG. 4B shows a meridional transverse aberration diagram when image blur correction is performed. FIG. 7 shows various aberration diagrams in the intermediate focal length state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the second example. FIG. 8 is an aberration diagram in the telephoto end state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the second example. FIG. 8A shows various aberrations in a state where image blur correction is not performed. FIG. 4B shows a meridional transverse aberration diagram when image blur correction is performed.
各諸収差図より第2実施例に係る防振機能を有する変倍光学系は、広角端状態から望遠端状態にわたって諸収差を良好に補正し、優れた結像性能を有していることがわかる。 From the various aberration diagrams, the variable magnification optical system having the anti-vibration function according to the second example has excellent imaging performance by properly correcting various aberrations from the wide-angle end state to the telephoto end state. Recognize.
(第3実施例)
図9は、第3実施例に係る防振機能を有する変倍光学系の広角端状態におけるレンズ構成を示す断面図である。
(Third embodiment)
FIG. 9 is a cross-sectional view showing a lens configuration in the wide-angle end state of the variable magnification optical system having the image stabilization function according to the third example.
第3実施例に係る防振機能を有する変倍光学系は、図9に示すように、物体側より順に、負の屈折力を持つ第1レンズ群G1、正の屈折力を持つ第2レンズ群G2、開口絞りSP、負の屈折力を持つ第3レンズ群G3、正の屈折力を持つ第4レンズ群G4で構成されている。 As shown in FIG. 9, the variable magnification optical system according to the third example includes a first lens group G1 having a negative refractive power and a second lens having a positive refractive power in order from the object side. It includes a group G2, an aperture stop SP, a third lens group G3 having a negative refractive power, and a fourth lens group G4 having a positive refractive power.
第1レンズ群G1は、物体側より順に、物体側に凸面を向けた負メニスカスレンズと、両凹形状の負レンズと、物体側に凸面を向けた正メニスカスレンズとからなり、最も物体側の負メニスカスレンズは像面I側のガラスレンズ面に樹脂層を設けて非球面を形成した非球面レンズである。 The first lens group G1 includes, in order from the object side, a negative meniscus lens having a convex surface facing the object side, a biconcave negative lens, and a positive meniscus lens having a convex surface facing the object side. The negative meniscus lens is an aspherical lens in which an aspherical surface is formed by providing a resin layer on the glass lens surface on the image plane I side.
第2レンズ群G2は、物体側より順に、物体側に凸面を向けた負メニスカスレンズと両凸形状の正レンズとの接合レンズと、物体側に凸面を向けた正メニスカスレンズとからなる。 The second lens group G2 includes, in order from the object side, a cemented lens of a negative meniscus lens having a convex surface facing the object side and a biconvex positive lens, and a positive meniscus lens having a convex surface facing the object side.
第3レンズ群G3は、物体側より順に、物体側に凹面を向けた正メニスカスレンズと両凹形状の負レンズとの接合レンズからなる。 The third lens group G3 is composed of a cemented lens of a positive meniscus lens having a concave surface directed toward the object side and a biconcave negative lens in order from the object side.
第4レンズ群G4は、物体側より順に、両凸形状の正レンズと、両凸形状の正レンズと像面I側に凸面を向けた負メニスカスレンズとの接合レンズとからなる。 The fourth lens group G4 is composed of, in order from the object side, a biconvex positive lens, and a cemented lens of a biconvex positive lens and a negative meniscus lens having a convex surface directed to the image plane I side.
開口絞りSPは、第2レンズ群G2と第3レンズ群G3との間に配置され、広角端状態から望遠端状態への変倍の際に、第3レンズ群G3と共に移動する。 The aperture stop SP is disposed between the second lens group G2 and the third lens group G3, and moves together with the third lens group G3 when zooming from the wide-angle end state to the telephoto end state.
広角端状態から望遠端状態への変倍の際に、第1レンズ群G1は像面Iに向かって凸の軌跡で移動し、第2レンズ群G2、第3レンズ群G3、第4レンズ群G4は物体側に移動する。 During zooming from the wide-angle end state to the telephoto end state, the first lens group G1 moves along a convex locus toward the image plane I, and the second lens group G2, the third lens group G3, and the fourth lens group. G4 moves to the object side.
また、本実施例に係る防振機能を有する変倍光学系では、第3レンズ群G3を光軸と直交する方向にシフトさせることで撮影画像のブレを補正している。 Further, in the variable magnification optical system having the image stabilization function according to the present embodiment, the blur of the photographed image is corrected by shifting the third lens group G3 in the direction orthogonal to the optical axis.
また、変倍光学系全系の焦点距離がfで、防振係数(手ブレ補正時の防振レンズ群の移動量に対する結像面I上での像の移動量の比)をKとするとき、角度θの回転ブレを補正するには、手ブレ補正用のレンズ群を(f・tanθ)/Kだけ光軸と直交方向に移動させればよい。本第3実施例の広角端状態において、防振係数Kは1.162であり、焦点距離は18.5(mm)であるので、0.734°の回転ブレを補正するための第3レンズ群の移動量は0.204(mm)である。本実施例の望遠端状態において、防振係数Kは2.037であり、焦点距離は53.5(mm)であるので、0.432°の回転ブレを補正するための第3レンズ群の移動量は0.198(mm)である。 The focal length of the entire zoom optical system is f, and the image stabilization coefficient (the ratio of the image movement amount on the image plane I to the movement amount of the image stabilization lens group during camera shake correction) is K. At this time, in order to correct the rotational shake of the angle θ, the camera shake correction lens group may be moved in the direction orthogonal to the optical axis by (f · tan θ) / K. In the third embodiment, in the wide-angle end state, the image stabilization coefficient K is 1.162, and the focal length is 18.5 (mm). Therefore, the third lens for correcting the rotation blur of 0.734 °. The amount of movement of the group is 0.204 (mm). In the telephoto end state of the present embodiment, since the image stabilization coefficient K is 2.037 and the focal length is 53.5 (mm), the third lens group for correcting the rotation blur of 0.432 ° is used. The amount of movement is 0.198 (mm).
以下の表3に、第3実施例に係る防振機能を有する変倍光学系の諸元値を示す。
(表3)
[全体諸元]
W T
f= 18.5 53.5
FNO= 3.6 5.8
[レンズデータ]
N r d νd nd
1) 116.280 1.9 58.9 1.51823
2) 16.299 0.2 38.09 1.55389
3) 13.699 10.0
4) -713.443 1.3 64.12 1.51680
5) 32.842 1.2
6) 26.928 2.9 27.51 1.75520
7) 55.608 D7
8) 26.524 1.0 27.51 1.75520
9) 15.327 4.1 64.12 1.51680
10) -59.620 0.1
11) 25.800 2.2 64.12 1.51680
12) 82.059 D12
13> 0.000 2.6 開口絞りSP
14) -38.072 2.1 28.69 1.79504
15) -13.274 1.4 50.24 1.71999
16) 63.523 D16
17) 253.480 3.0 64.12 1.51680
18) -22.683 0.2
19) 135.687 3.7 64.12 1.51680
20) -18.552 1.0 28.69 1.79504
21) -70.947 Bf
[非球面データ]
N= 3面
κ= 0
C4= 2.3519E-05
C6= 4.6561E-08
C8= -1.0850E-10
C10= 6.4207E-13
N= 14面
有効径H= 6.11
κ= 0
C4= -9.0304E-07
C6= -6.8311E-09
C8= 0.00E+00
C10= 0.00E+00
N= 17面
κ= 1
C4= -9.1652E-06
C6= -3.3073E-08
C8= 2.4437E-10
C10= 1.3217E-13
[可変間隔データ]
W M T
D7 32.98 20.45 1.20
D12 1.89 3.84 10.08
D16 12.20 10.26 4.01
Bf 37.79 42.86 69.35
[条件式対応値]
(1):f2/fW= 1.55
(2):f3/fW= -2.04
(3):|ASPd0.5|/(H/2)= 0.0000373
(4):|ASPd1.0|/(H/2)= 0.000517
(5):|ASPd0.5|/|ASPd1.0|= 0.072
Table 3 below shows specification values of the variable magnification optical system having the image stabilization function according to the third example.
(Table 3)
[Overall specifications]
W T
f = 18.5 53.5
FNO = 3.6 5.8
[Lens data]
N r d νd nd
1) 116.280 1.9 58.9 1.51823
2) 16.299 0.2 38.09 1.55389
3) 13.699 10.0
4) -713.443 1.3 64.12 1.51680
5) 32.842 1.2
6) 26.928 2.9 27.51 1.75520
7) 55.608 D7
8) 26.524 1.0 27.51 1.75520
9) 15.327 4.1 64.12 1.51680
10) -59.620 0.1
11) 25.800 2.2 64.12 1.51680
12) 82.059 D12
13> 0.000 2.6 Aperture stop SP
14) -38.072 2.1 28.69 1.79504
15) -13.274 1.4 50.24 1.71999
16) 63.523 D16
17 ) 253.480 3.0 64.12 1.51680
18 ) -22.683 0.2
19 ) 135.687 3.7 64.12 1.51680
20 ) -18.552 1.0 28.69 1.79504
21 ) -70.947 Bf
[Aspherical data]
N = 3 sides κ = 0
C4 = 2.3519E-05
C6 = 4.6561E-08
C8 = -1.0850E-10
C10 = 6.4207E-13
N = 14 faces Effective diameter H = 6.11
κ = 0
C4 = -9.0304E-07
C6 = -6.8311E-09
C8 = 0.00E + 00
C10 = 0.00E + 00
N = 17 surface κ = 1
C4 = -9.1652E-06
C6 = -3.3073E-08
C8 = 2.4437E-10
C10 = 1.3217E-13
[Variable interval data]
W M T
D7 32.98 20.45 1.20
D12 1.89 3.84 10.08
D16 12.20 10.26 4.01
Bf 37.79 42.86 69.35
[Conditional expression values]
(1): f2 / fW = 1.55
(2): f3 / fW = −2.04
(3): | ASPd0.5 | / (H / 2) = 0.0000373
(4): | ASPd1.0 | / (H / 2) = 0.000517
(5): | ASPd0.5 | / | ASPd1.0 | = 0.072
図10は、第3実施例に係る防振機能を有する変倍光学系の無限遠合焦時の広角端状態における収差図を示し、(a)は画像ブレ補正をおこなわない状態での諸収差図を、(b)は画像ブレ補正をおこなった時のメリディオナル横収差図を示す。図11は、第3実施例に係る防振機能を有する変倍光学系の無限遠合焦時の中間焦点距離状態での諸収差図を示す。図12は、第3実施例に係る防振機能を有する変倍光学系の無限遠合焦時の望遠端状態における収差図を示し、(a)は画像ブレ補正をおこなわない状態での諸収差図を、(b)は画像ブレ補正をおこなった時のメリディオナル横収差図を示す。 FIG. 10 is an aberration diagram in the wide-angle end state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the third example. FIG. 10A shows various aberrations in a state where image blur correction is not performed. FIG. 4B shows a meridional transverse aberration diagram when image blur correction is performed. FIG. 11 shows various aberration diagrams in the intermediate focal length state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the third example. FIG. 12 is an aberration diagram in the telephoto end state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the third example. FIG. 12A illustrates various aberrations in a state where image blur correction is not performed. FIG. 4B shows a meridional transverse aberration diagram when image blur correction is performed.
各諸収差図より第3実施例に係る防振機能を有する変倍光学系は、広角端状態から望遠端状態にわたって諸収差を良好に補正し、優れた結像性能を有していることがわかる。 From the various aberration diagrams, the variable magnification optical system having the anti-vibration function according to the third example is excellent in correcting various aberrations from the wide-angle end state to the telephoto end state and having excellent imaging performance. Recognize.
以上の各実施例によれば、高変倍比を有しながら、振動や手ブレなどによる撮影画像のブレを補正することができ、良好な光学性能を持った防振機能を備えた変倍光学系を提供することができる。 According to each of the embodiments described above, a zooming ratio that has a high zoom ratio, can correct blurring of a photographed image due to vibration, camera shake, and the like, and has a vibration proof function with good optical performance. An optical system can be provided.
なお、本防振機能を有する変倍光学系の数値実施例として4群構成のものを示したが、本変倍光学系の群構成はこれに限られず、5群等の他の群構成にも適用可能である。 Although a four-group configuration is shown as a numerical example of the variable magnification optical system having the image stabilization function, the group configuration of the variable magnification optical system is not limited to this, and other group configurations such as five groups are used. Is also applicable.
また、本防振機能を有する変倍光学系において、無限遠物体から近距離物体への合焦を行うために、レンズ群の一部、1つのレンズ群、又は複数のレンズ群を合焦レンズ群として光軸方向へ移動させる構成としてもよい。この合焦レンズ群は、オートフォーカスに適用することも可能であり、オートフォーカス用のモータ、例えば超音波モータ等による駆動にも適している。なお、本変倍光学系においては、特に第1レンズ群全体又はその一部を合焦レンズ群とすることが好ましい。 Further, in the variable magnification optical system having the present image stabilization function, in order to focus from an object at infinity to an object at a short distance, a part of the lens group, one lens group, or a plurality of lens groups is a focusing lens. It is good also as a structure which moves to an optical axis direction as a group. This focusing lens group can also be applied to autofocus, and is also suitable for driving by an autofocus motor, such as an ultrasonic motor. In the variable magnification optical system, it is particularly preferable that the entire first lens group or a part thereof is a focusing lens group.
また、上記各実施例では、第3レンズ群G3の全体又は一部を防振レンズ群として光軸に垂直な方向にシフトさせる変倍光学系を例示しているが、他のレンズ群全体又はその一部、特に第2レンズ群G2や第4レンズ群を防振レンズ群とすることもできる。 In each of the above-described embodiments, the variable power optical system that shifts the whole or a part of the third lens group G3 as a vibration-proof lens group in a direction perpendicular to the optical axis is illustrated. Some of them, in particular, the second lens group G2 and the fourth lens group can be used as an anti-vibration lens group.
また、本防振機能を有する変倍光学系を構成するレンズのレンズ面を非球面としてもよい。この非球面は、研削加工による非球面、ガラスを型で非球面形状に成型したガラスモールド非球面、又はガラス面に設けた樹脂を非球面形状に形成した複合型非球面のいずれでもよい。 The lens surface of the lens constituting the variable magnification optical system having the image stabilization function may be an aspherical surface. This aspherical surface may be any one of an aspherical surface by grinding, a glass mold aspherical surface formed by molding glass into an aspherical shape, or a composite aspherical surface in which a resin provided on the glass surface is formed into an aspherical shape.
また、本防振機能を有する変倍光学系を構成するレンズのレンズ面に、広い波長域で高い透過率を有する反射防止膜を施してもよい。これにより、フレアやゴーストを軽減し、高コントラストで高い光学性能を達成することができる。 Further, an antireflection film having a high transmittance in a wide wavelength range may be provided on the lens surface of the lens constituting the variable magnification optical system having the present image stabilizing function. Thereby, flare and ghost can be reduced, and high optical performance can be achieved with high contrast.
以下、本願にかかる防振機能を有するズームレンズを搭載した撮像装置(一眼レフカメラ)に関し説明する。 Hereinafter, an image pickup apparatus (single-lens reflex camera) equipped with a zoom lens having an image stabilization function according to the present application will be described.
図13は、上述した本実施例に係る防振機能を有するズームレンズを搭載した撮像装置(一眼レフカメラ)の概略構成図である。 FIG. 13 is a schematic configuration diagram of an imaging apparatus (single-lens reflex camera) equipped with the zoom lens having the image stabilization function according to the above-described embodiment.
図13において、不図示の被写体からの光は、上述した防振機能を有するズームレンズ11で集光され、クイックリターンミラー12で反射されて焦点板13に結像される。焦点板13に結像された被写体像は、ペンタプリズム14で複数回反射されて接眼レンズ15を介して撮影者に正立像として観察可能に構成されている。
In FIG. 13, light from a subject (not shown) is collected by the
撮影者は、不図示のレリーズ釦を半押ししながら接眼レンズ15を介して被写体像を観察して撮影構図を決めた後、レリーズ釦を全押しする。レリーズ釦を全押しした時、クイックリターンミラー12が上方に跳ね上げられ被写体からの光は撮像素子16で受光され撮影画像が取得され、不図示のメモリに記録される。
The photographer presses the release button fully after observing the subject image through the
レリーズ釦を全押しした時、撮像装置(一眼レフカメラ)10に内蔵されているセンサー17(例えば、角度センサーなど)でカメラ10の傾きが検出されてCPU18に伝達され、CPU18で回転ブレ量が検出され手ブレ補正用レンズ群を光軸に直交方向に駆動するレンズ駆動手段19が駆動され、手ブレ発生時の撮像素子16上における像ブレが補正される。このようにして、上述した防振機能を有するズームレンズ11を具備する撮像装置10が構成されている。
When the release button is fully pressed, the tilt of the
なお、上記各実施例は本発明の一具体例を示しているものであり、本発明はこれらに限定されるものではない。 In addition, each said Example has shown one specific example of this invention, and this invention is not limited to these.
10: 撮像装置(カメラ)
11: 防振機能を有する変倍光学系(ズームレンズ)
12: クイックリターンミラー
13: 焦点板
14: ペンタプリズム
15: 接眼レンズ
16: 撮像素子
17: センサー(角度センサー)
18: CPU
19: レンズ駆動手段
G1: 第1レンズ群
G2: 第2レンズ群
G3: 第3レンズ群
G4: 第4レンズ群
SP: 開口絞り
I: 像面
10: Imaging device (camera)
11: Variable magnification optical system (zoom lens) with image stabilization function
12: Quick return mirror 13: Focus plate 14: Penta prism 15: Eyepiece 16: Image sensor 17: Sensor (angle sensor)
18: CPU
19: Lens driving means G1: First lens group G2: Second lens group G3: Third lens group G4: Fourth lens group SP: Aperture stop I: Image plane
Claims (11)
1.52 ≦ f2/fw < 2.50
−2.10 < f3/fw <−0.80
ただし、
f2:第2レンズ群の焦点距離
f3:第3レンズ群の焦点距離
fw:広角端での焦点距離 In order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a fourth lens having a positive refractive power When the zooming is performed from the wide-angle end state to the telephoto end state, the distance between the second lens group and the third lens group changes, and the third lens The lens group is moved so that the distance between the group and the fourth lens group changes, and at least a part of the third lens group is shifted in a direction orthogonal to the optical axis to correct the image plane when an image blur occurs. An anti-vibration lens group is provided, wherein the anti-vibration lens group has at least one aspheric surface, and the first lens group includes three or less lenses, and has at least one aspheric surface. , the fourth lens group is composed of three or less lenses, at least one aspherical surface And, the variable magnification optical system having a vibration reduction function that satisfies the following conditional expression.
1.52 ≦ f2 / fw <2.50
-2.10 <f3 / fw <-0.80
However,
f2: Focal length of the second lens group
f3: focal length of the third lens unit
fw: Focal length at the wide-angle end
1.52 ≦ f2/fw < 2.50
−2.10 < f3/fw ≦ −2.04
ただし、
f2:第2レンズ群の焦点距離
f3:第3レンズ群の焦点距離
fw:広角端での焦点距離 In order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a fourth lens having a positive refractive power When the zooming is performed from the wide-angle end state to the telephoto end state, the distance between the second lens group and the third lens group changes, and the third lens The lens group is moved so that the distance between the group and the fourth lens group changes, and at least a part of the third lens group is shifted in a direction orthogonal to the optical axis to correct the image plane when an image blur occurs. A variable magnification optical system having an anti-vibration function, wherein the anti-vibration lens group includes at least one aspherical surface and satisfies the following conditional expression.
1.52 ≦ f2 / fw <2.50
-2.10 <f3 / fw ≦ −2.04
However,
f2: Focal length of the second lens group
f3: focal length of the third lens unit
fw: Focal length at the wide-angle end
0.00001<|ASPd0.5|/(H/2)<0.01
0.0001<|ASPd1.0|/(H/2)<0.01
|ASPd0.5|/|ASPd1.0|<1
ただし、Hは非球面レンズの有効径、ASPd0.5は非球面有効径の5割の高さにおける近軸曲率半径と非球面形状との偏差量、ASPd1.0は非球面有効径の10割の高さにおける近軸曲率半径と非球面形状との偏差量を示す。 At least one aspheric surface in the third lens group is formed so that the positive refractive index increases from the optical axis toward the periphery or the negative refractive power decreases compared to a spherical surface having a paraxial radius of curvature. shape has a variable magnification optical system having a vibration reduction function according to any one of claims 1 5, characterized by satisfying the following conditional expression.
0.00001 <| ASPd0.5 | / (H / 2) <0.01
0.0001 <| ASPd1.0 | / (H / 2) <0.01
| ASPd0.5 | / | ASPd1.0 | <1
Where H is the effective diameter of the aspherical lens, ASPd0.5 is the deviation between the paraxial curvature radius and the aspherical shape at 50% of the aspherical effective diameter, and ASPd1.0 is 100% of the effective aspherical diameter. The amount of deviation between the paraxial radius of curvature and the aspherical shape at the height of is shown.
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JP2006347841A JP5082431B2 (en) | 2006-12-25 | 2006-12-25 | Magnification optical system having image stabilization function, imaging device, and magnifying method |
US12/303,305 US20090231708A1 (en) | 2006-07-21 | 2007-07-12 | Zoom lens system, imaging apparatus, and method for zooming the zoom lens system |
EP07791042A EP2045639A4 (en) | 2006-07-21 | 2007-07-12 | Variable power optical system, imaging device, method of varying magnification of variable power optical system |
PCT/JP2007/064300 WO2008010563A1 (en) | 2006-07-21 | 2007-07-12 | Variable power optical system, imaging device, method of varying magnification of variable power optical system |
CN2012100553814A CN102608736A (en) | 2006-07-21 | 2007-07-12 | Zoom lens system, imaging apparatus, and method for zooming the zoom lens system |
CN200780027520XA CN101490594B (en) | 2006-07-21 | 2007-07-12 | Variable power optical system, imaging device, method of varying magnification of variable power optical system |
US13/090,936 US20110194191A1 (en) | 2006-07-21 | 2011-04-20 | Zoom lens system, imaging apparatus, and method for zooming the zoom lens system |
US13/545,651 US20120275032A1 (en) | 2006-07-21 | 2012-07-10 | Zoom lens system, imaging apparatus, and method for zooming the zoom lens system |
US14/092,748 US10437026B2 (en) | 2006-07-21 | 2013-11-27 | Zoom lens system, imaging apparatus, and method for zooming the zoom lens system |
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KR101782994B1 (en) | 2010-09-07 | 2017-09-28 | 삼성전자주식회사 | Compact zoom lens |
JP5915437B2 (en) * | 2012-07-27 | 2016-05-11 | ソニー株式会社 | Variable focal length lens system and imaging apparatus |
JP2015121768A (en) | 2013-11-21 | 2015-07-02 | 株式会社ニコン | Zoom lens, optical apparatus and method for manufacturing the zoom lens |
JP6609412B2 (en) * | 2015-02-17 | 2019-11-20 | 株式会社タムロン | Optical system and imaging apparatus |
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JPH04235514A (en) * | 1991-01-11 | 1992-08-24 | Nikon Corp | Super-wide angle zoom lens |
JP3042107B2 (en) * | 1991-11-13 | 2000-05-15 | ミノルタ株式会社 | Zoom lens |
JPH09113808A (en) * | 1995-10-20 | 1997-05-02 | Nikon Corp | Zoom lens |
JP3926411B2 (en) * | 1996-07-09 | 2007-06-06 | リコー光学株式会社 | Zoom lens for color projector |
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US5805351A (en) * | 1997-03-13 | 1998-09-08 | Nikon Corporation | High speed wide angle zoom lens system |
JPH11174329A (en) * | 1997-12-15 | 1999-07-02 | Canon Inc | Variable power optical system having vibration-proof function |
JP4378008B2 (en) * | 1999-12-22 | 2009-12-02 | キヤノン株式会社 | Anti-shake zoom lens |
JP4672827B2 (en) * | 2000-01-28 | 2011-04-20 | 株式会社栃木ニコン | Zoom lens and projection display device including the zoom lens |
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