JP5718020B2 - Zoom lens and imaging device - Google Patents
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- JP5718020B2 JP5718020B2 JP2010243942A JP2010243942A JP5718020B2 JP 5718020 B2 JP5718020 B2 JP 5718020B2 JP 2010243942 A JP2010243942 A JP 2010243942A JP 2010243942 A JP2010243942 A JP 2010243942A JP 5718020 B2 JP5718020 B2 JP 5718020B2
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/177—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/142—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only
- G02B15/1425—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only the first group being negative
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0087—Simple or compound lenses with index gradient
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
- G02B3/04—Simple or compound lenses with non-spherical faces with continuous faces that are rotationally symmetrical but deviate from a true sphere, e.g. so called "aspheric" lenses
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/02—Bodies
- G03B17/12—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B2003/0093—Simple or compound lenses characterised by the shape
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Description
本発明は、ズームレンズ及び撮像装置に関する。 The present invention relates to a zoom lens and an imaging apparatus.
従来、監視カメラやビデオカメラ、電子スチルカメラなどの撮像装置に用いられる撮像光学系として、物体側から順に、負の屈折力を有する第1レンズ群と、正の屈折力を有する第2レンズ群とを備え、第2レンズ群を光軸に沿って移動させることにより変倍(ズーミング)を行い、この変倍に伴う像面変動の補正と合焦(フォーカシング)を第1レンズ群の移動により行う2群方式のズームレンズが知られている(例えば、特許文献1〜4を参照。)。
Conventionally, as an imaging optical system used in an imaging apparatus such as a surveillance camera, a video camera, and an electronic still camera, in order from the object side, a first lens group having a negative refractive power and a second lens group having a positive refractive power And zooming is performed by moving the second lens unit along the optical axis, and correction and focusing of image plane variation accompanying the zooming are performed by moving the first lens unit. A two-group zoom lens is known (see, for example,
近年、昼でも夜間でも稼動できる監視カメラが開発されている。これに伴って、監視カメラに適する可視域・近赤外域両用のズームレンズの需要が高まってきている。このような監視カメラ用のズームレンズでは、特に色収差が良好に維持されることが求められる。また、低照度での撮影に対応するため、大口径比で明るいズームレンズが求められている。 In recent years, surveillance cameras have been developed that can operate day or night. Along with this, there is an increasing demand for zoom lenses for both visible and near infrared regions suitable for surveillance cameras. In such a zoom lens for a surveillance camera, it is particularly required that chromatic aberration be maintained well. In addition, a zoom lens that is bright with a large aperture ratio is required in order to support shooting at low illuminance.
しかしながら、従来のように可視域用に設計されたズームレンズでは、特に近赤外領域において色収差が発生してしまい、夜間の近赤外領域での撮影の際にピントずれを起こしてしまうといった問題があった。 However, in the conventional zoom lens designed for the visible range, chromatic aberration occurs particularly in the near-infrared region, which causes a focus shift when photographing in the near-infrared region at night. was there.
本発明は、このような従来の事情に鑑みて提案されたものであり、可視域から近赤外域まで高い光学性能が得られる小型の大口径ズームレンズ、並びにそのようなズームレンズを備えた撮像装置を提供することを目的とする。 The present invention has been proposed in view of such a conventional situation, and is a small-sized large-diameter zoom lens capable of obtaining high optical performance from the visible range to the near-infrared range, and an imaging provided with such a zoom lens. An object is to provide an apparatus.
上記目的を達成するために、本発明に係るズームレンズは、物体側から順に、全体として負の屈折力を有する第1レンズ群と、全体として正の屈折力を有する第2レンズ群とを備え、第1レンズ群と第2レンズ群との間に絞りが配置され、第1レンズ群と第2レンズ群との間隔を変化させることにより変倍を行うズームレンズであって、第2レンズ群は、少なくとも4枚以上のレンズから構成されており、このうち、最も物体側に位置するレンズの少なくとも一方のレンズ面が非球面とされ、最も像面側に位置するレンズの少なくとも一方のレンズ面が非球面とされ、物体側から3番目に位置するレンズの物体側のレンズ面が凸面とされ、物体側から2番目に位置するレンズのアッベ数をνd22、物体側のレンズ面の曲率半径をR22a、像面側のレンズ面の曲率半径をR22bとしたときに、65<νd22、R22a/R22b<0の関係を満足する。 In order to achieve the above object, a zoom lens according to the present invention includes, in order from the object side, a first lens group having a negative refractive power as a whole and a second lens group having a positive refractive power as a whole. A zoom lens in which a diaphragm is disposed between the first lens group and the second lens group, and zooming is performed by changing an interval between the first lens group and the second lens group. Is composed of at least four or more lenses, of which at least one lens surface of the lens located closest to the object side is an aspherical surface, and at least one lens surface of the lens positioned closest to the image plane side Is an aspherical surface, the lens surface on the object side of the lens located third from the object side is a convex surface, the Abbe number of the lens located second from the object side is νd 22 , and the radius of curvature of the lens surface on the object side is a R 22a The curvature radius of the lens surface on the image plane side is taken as R 22b, satisfy the relation: 65 <νd 22, R 22a / R 22b <0.
以上のように、本発明によれば、可視域から近赤外域まで高い光学性能が得られる小型の大口径ズームレンズ、並びにそのようなズームレンズを備えた撮像装置を提供することが可能である。 As described above, according to the present invention, it is possible to provide a small-sized large-aperture zoom lens capable of obtaining high optical performance from the visible range to the near-infrared range, and an imaging apparatus including such a zoom lens. .
以下、本発明の実施の形態について、図面を参照して詳細に説明する。
なお、以下の説明において例示されるレンズデータ等は一例であって、本発明はそれらに必ずしも限定されるものではなく、その要旨を変更しない範囲で適宜変更して実施することが可能である。
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Note that the lens data and the like exemplified in the following description are merely examples, and the present invention is not necessarily limited thereto, and can be appropriately modified and implemented without changing the gist thereof.
本発明を適用したズームレンズは、例えば図1に示すように、物体側から順に、全体として負の屈折力を有する第1レンズ群L1と、全体として正の屈折力を有する第2レンズ群L2とを備えている。また、第1レンズ群L1と第2レンズ群L2との間には、絞りSPが配置され、第2レンズ群L2と像面IPとの間には、光学フィルタやフェースプレート等に相当する光学ブロックGが配置されている。 The zoom lens to which the present invention is applied includes, for example, as shown in FIG. 1, in order from the object side, a first lens unit L1 having a negative refractive power as a whole and a second lens group L2 having a positive refractive power as a whole. And. An aperture stop SP is disposed between the first lens unit L1 and the second lens unit L2, and an optical filter, a face plate, or the like is provided between the second lens unit L2 and the image plane IP. Block G is arranged.
そして、このズームレンズでは、第2レンズ群L2を光軸に沿って図1中の矢印a方向に移動させることにより変倍(ズーミング)を行うと同時に、第1レンズ群L1を光軸に沿って図1中の矢印b,c方向に移動させることにより、変倍に伴う像面変動の補正と合焦(フォーカシング)とを行う。これにより、第1レンズ群L1と第2レンズ群L2との間の空間の有効利用を図り、このズームレンズの全長を短縮することが可能となっている。 In this zoom lens, zooming is performed by moving the second lens unit L2 along the optical axis in the direction of arrow a in FIG. 1, and at the same time, the first lens unit L1 is moved along the optical axis. By moving in the directions of arrows b and c in FIG. 1, the correction of the image plane variation due to zooming and focusing are performed. As a result, the space between the first lens unit L1 and the second lens unit L2 can be effectively used, and the overall length of the zoom lens can be shortened.
なお、図1中に実線で示す矢印aは、広角端から望遠端にズーミングしているときの第2レンズ群L2の移動軌跡(直線的な軌跡)を示し、図1中に実線で示す矢印bと破線で示す矢印cとは、それぞれ無限遠物体と近距離物体とにフォーカッシングしているときの変倍に伴う像面変動を補正するための第1レンズ群L1の移動軌跡(像面IP側に凸となる軌跡)を示す。 An arrow a indicated by a solid line in FIG. 1 indicates a movement locus (linear locus) of the second lens unit L2 during zooming from the wide-angle end to the telephoto end, and an arrow indicated by a solid line in FIG. b and an arrow c indicated by a broken line indicate movement trajectories (image planes) of the first lens unit L1 for correcting image plane fluctuations accompanying zooming when focusing on an object at infinity and an object at short distance, respectively. (Trajectory convex on the IP side).
また、図1では、物体側から順に、第1レンズ群L1を構成する3枚のレンズ1〜3と、第2レンズ群L2を構成する4枚のレンズ4〜7とを例示しているが、本発明を適用したズームレンズは、本実施形態のものに必ずしも限定されるものではなく、本発明の要旨を変更しない範囲で適宜変更して実施することが可能である。
FIG. 1 illustrates three
ところで、可視域から近赤外域まで高い光学性能が得られる小型の大口径ズームレンズを得るためには、球面収差と色収差とを適切に補正し、なお且つ、小型化に伴う移動レンズ群の収差発生量を抑制する必要がある。 By the way, in order to obtain a small large-aperture zoom lens that can obtain high optical performance from the visible range to the near-infrared range, the spherical aberration and the chromatic aberration are corrected appropriately, and the aberration of the moving lens group accompanying the miniaturization is reduced. It is necessary to suppress the generation amount.
このような課題を解決するために、本発明を適用したズームレンズを構成するレンズ群L1,L2のうち、第2レンズ群L2は、少なくとも4枚以上のレンズ4〜7から構成し、このうち、最も物体側に位置するレンズ4の少なくとも一方のレンズ面を非球面とし、最も像面側に位置するレンズ7の少なくとも一方のレンズ面を非球面とし、物体側から3番目に位置するレンズ6の物体側のレンズ面が凸面としている。これにより、レンズ周辺部における収差を抑制し、変倍に伴う球面収差の変動を補正している。
In order to solve such a problem, among the lens groups L1 and L2 constituting the zoom lens to which the present invention is applied, the second lens group L2 is composed of at least four or
また、本発明を適用したズームレンズでは、物体側から2番目に位置するレンズ5のアッベ数をνd22、物体側のレンズ面の曲率半径をR22a[mm]、像面側のレンズ面の曲率半径をR22b[mm]としたときに、下記式(1),(2)の関係を満足している。
65<νd22 …(1)
R22a/R22b<0 …(2)
In the zoom lens to which the present invention is applied, the Abbe number of the
65 <νd 22 (1)
R 22a / R 22b <0 (2)
本発明では、上記式(1)の条件を満足することによって、可視領域から近赤外領域における軸上色収差を補正することができる。また、上記式(2)の条件を満足することによって、正の屈折力を維持しながら、可視領域から近赤外領域における軸上色収差を補正することができる。 In the present invention, the axial chromatic aberration from the visible region to the near infrared region can be corrected by satisfying the condition of the above formula (1). Further, by satisfying the condition of the above formula (2), it is possible to correct axial chromatic aberration from the visible region to the near infrared region while maintaining positive refractive power.
本発明を適用したズームレンズでは、第1レンズ群L1の合成焦点距離をf1[mm]、第2レンズ群L2の合成焦点距離をf2[mm]としたときに、下記式(3)の関係を満足することが好ましい。
1.0 <|f2/f1|<1.5 …(3)
In the zoom lens to which the present invention is applied, when the combined focal length of the first lens unit L1 is f 1 [mm] and the combined focal length of the second lens unit L2 is f 2 [mm], the following formula (3) It is preferable to satisfy this relationship.
1.0 <| f 2 / f 1 | <1.5 (3)
本発明では、上記式(3)の下限値を下回ると、第1レンズ群L1の負の屈折力が弱まり、広角化が困難になる。また、第2レンズ群L2の正の屈折力が強くなり、球面収差が補正過剰になり、大口径化が困難になる。一方、上記式(3)の上限値を上回ると、第2レンズ群L2の正の屈折力が弱まり、広角端から望遠端状態まで変倍時の移動量が増えてしまい全長が長くなる。 In the present invention, when the value falls below the lower limit of the above formula (3), the negative refractive power of the first lens unit L1 is weakened, and it is difficult to widen the angle. Further, the positive refractive power of the second lens unit L2 becomes strong, the spherical aberration is overcorrected, and it is difficult to increase the diameter. On the other hand, when the value exceeds the upper limit of the above formula (3), the positive refractive power of the second lens unit L2 is weakened, the amount of movement during zooming from the wide-angle end to the telephoto end state is increased, and the total length is increased.
そして、本発明では、下記式(3)’の関係を満足することが更に好ましい。
1.05 <|f2/f1|<1.3 …(3)’
And in this invention, it is still more preferable to satisfy the relationship of following formula (3) '.
1.05 <| f 2 / f 1 | <1.3 (3) ′
本発明を適用したズームレンズでは、広角端における全系の焦点距離をfw[mm]としたときに、下記式(4)の関係を満足することが好ましい。
0.2<fw/f2 <0.4 …(4)
In the zoom lens to which the present invention is applied, it is preferable that the relationship of the following formula (4) is satisfied when the focal length of the entire system at the wide angle end is fw [mm].
0.2 <f w / f 2 <0.4 (4)
本発明では、上記式(4)の下限値を下回ると、球面収差が補正過剰になり、コマ収差が補正不足になる。一方、上記式(4)の上限値を上回ると、球面収差と軸上色収差が補正不足になり、コマ収差が補正過剰になる。 In the present invention, if the value falls below the lower limit of the above equation (4), the spherical aberration is overcorrected and the coma aberration is undercorrected. On the other hand, when the value exceeds the upper limit of the above formula (4), the spherical aberration and the longitudinal chromatic aberration are undercorrected, and the coma aberration is overcorrected.
そして、本発明では、下記式(4)’の関係を満足することが更に好ましい。
0.25<fw/f2 <0.35 …(4)’
In the present invention, it is more preferable to satisfy the relationship of the following formula (4) ′.
0.25 <f w / f 2 <0.35 (4) ′
本発明を適用したズームレンズでは、第1レンズ群L1の最も像側に位置するレンズ3が正の屈折力を有し、且つ、当該レンズ3のアッベ数をνd 13 としたときに、下記式(5)の関係を満足することが好ましい。
25>νd 13 …(5)
In the zoom lens according to the present invention, a
25> νd 13 (5)
本発明では、上記式(5)の上限値を上回ると、可視領域から近赤外領域における軸上色収差の補正が困難になる。 In the present invention, when the value exceeds the upper limit of the above formula (5), it is difficult to correct axial chromatic aberration from the visible region to the near infrared region.
本発明を適用したズームレンズでは、望遠端における第2レンズ群L2の近軸結像倍率をβt2としたときに、下記式(6)の関係を満足することが好ましい。
−1.5<βt2<−1.0 …(6)
In the zoom lens according to the present invention, a paraxial imaging magnification of the second lens unit L2 at the telephoto end when the [beta] t 2, it is preferable to satisfy a relationship represented by the following formula (6).
−1.5 <β t2 <−1.0 (6)
本発明では、上記式(6)の下限値を下回ると、広角端における歪曲収差の補正が困難になる。一方、上記式(6)の上限値を上回ると、広角端から望遠端状態まで変倍時の移動量が増えてしまい全長が長くなる。 In the present invention, when the value falls below the lower limit of the above formula (6), it becomes difficult to correct distortion at the wide angle end. On the other hand, when the value exceeds the upper limit value of the above formula (6), the amount of movement during zooming from the wide-angle end to the telephoto end state increases and the total length becomes longer.
そして、本発明では、下記式(6)’の関係を満足することが更に好ましい。
−1.3<βt2<−1.1 …(6)’
And in this invention, it is still more preferable to satisfy the relationship of following formula (6) '.
−1.3 <β t2 <−1.1 (6) ′
本発明を適用したズームレンズでは、第1レンズ群L1の最も物体側に位置するレンズ1の物体側の頂点から像面IPまでの光軸上の距離をΣd[mm]、望遠端における全系の焦点距離をft[mm]としたときに、下記式(7)の関係を満足することが好ましい。
4.0<Σd/ft<6.5 …(7)
In the zoom lens to which the present invention is applied, the distance on the optical axis from the vertex on the object side of the
4.0 <Σ d / f t <6.5 (7)
本発明では、上記式(7)の下限値を超えてズームレンズの小型化を図ろうとすると、像面湾曲の補正が困難になる。一方、上記式(7)の上限値を超えると、収差補正が容易となるものの、ズームレンズの全長が長くなってしまう。 In the present invention, if it is attempted to reduce the size of the zoom lens beyond the lower limit of the above formula (7), it becomes difficult to correct the curvature of field. On the other hand, if the upper limit value of the equation (7) is exceeded, aberration correction is easy, but the total length of the zoom lens becomes long.
そして、本発明では、下記式(7)’の関係を満足することが更に好ましい。
4.5<Σd/ft<6.0 …(7)’
In the present invention, it is more preferable to satisfy the relationship of the following formula (7) ′.
4.5 <Σ d / f t <6.0 (7) ′
本発明を適用したズームレンズでは、第1レンズ群L1と第2レンズ群L2との間に、変倍時に移動しないように像面IPまでの距離を固定して絞りSPを配置し、広角端における絞りSPから第2レンズ群L2の第1主点(物体側主点)までの距離をDw[mm]、第2レンズ群L2の合成焦点距離をf2[mm]としたときに、下記式(8)の関係を満足することが好ましい。
0.8<Dw/f2<1.3 …(8)
In the zoom lens to which the present invention is applied, a diaphragm SP is disposed between the first lens unit L1 and the second lens unit L2 so that the distance to the image plane IP is fixed so as not to move at the time of zooming. When the distance from the stop SP to the first principal point (object side principal point) of the second lens unit L2 is D w [mm] and the combined focal length of the second lens unit L2 is f 2 [mm], It is preferable that the relationship of the following formula (8) is satisfied.
0.8 <D w / f 2 <1.3 (8)
本発明では、上記式(8)の下限値を下回ると、射出瞳距離を十分に確保できなくなり、像面IPに垂直入射することが困難になる。一方、上記式(8)の上限値を上回ると、第2レンズ群L2の径が大きくなり、ズームレンズの全長が長くなってしまう。 In the present invention, when the value falls below the lower limit value of the above formula (8), it is not possible to secure a sufficient exit pupil distance, and it becomes difficult to make vertical incidence on the image plane IP. On the other hand, when the value exceeds the upper limit of the above formula (8), the diameter of the second lens unit L2 becomes large and the entire length of the zoom lens becomes long.
そして、本発明では、下記式(8)’の関係を満足することが更に好ましい。
0.9<Dw/f2<1.2 …(8)’
In the present invention, it is more preferable that the relationship of the following formula (8) ′ is satisfied.
0.9 <D w / f 2 <1.2 (8) ′
以上のような条件を満足する本発明を適用したズームレンズでは、可視域から近赤外域まで諸収差を良好に補正することができ、広角端から望遠端に至るまで良好な光学性能を得ると共に、その全長を短くすることによって、更なる小型化を図ることが可能である。 In the zoom lens to which the present invention that satisfies the above conditions is applied, various aberrations can be favorably corrected from the visible range to the near infrared range, and excellent optical performance is obtained from the wide-angle end to the telephoto end. It is possible to further reduce the size by shortening the total length.
そして、この高い光学性能が得られる小型の大口径ズームレンズは、例えば、監視カメラや、デジタルビデオカメラ、デジタルスチルカメラなどの撮像装置の撮像光学系として使用することができる。その中でも特に、昼でも夜間でも稼動できる監視カメラに適用した場合には、近赤外領域における色収差を良好に維持すると共に、変倍に伴う球面収差の変動を容易に補正することができ、また、低照度での撮影に対応するため、大口径比で明るい可視域・近赤外域両用のズームレンズを実現できる。 The small large-aperture zoom lens capable of obtaining this high optical performance can be used as an imaging optical system of an imaging apparatus such as a surveillance camera, a digital video camera, or a digital still camera. In particular, when applied to a surveillance camera that can be operated day or night, chromatic aberration in the near-infrared region can be maintained well, and fluctuations in spherical aberration associated with zooming can be easily corrected. In order to support shooting at low illuminance, it is possible to realize a zoom lens that has a large aperture ratio and is bright for both the visible and near infrared regions.
本発明を適用したズームレンズを備える撮像装置は、このズームレンズの物体側から入射した光が最終的に像面IPに配置される、例えばCCD(Charge Coupled Device)やCMOS(Complementary Mental-Oxide Semiconductor device)センサなどの固体撮像素子(光電変換素子)の撮像面に結像するようになされている。そして、撮像装置は、この固体撮像素子が受像した光を光電変換して電気信号として出力し、被写体の像に対応したデジタル画像を生成して、例えばHDD(Hard Disk Drive)やメモリカード、光ディスク、磁気テープなどの記録媒体に記録することになる。なお、撮像装置が銀塩フィルムカメラのときは、像面IPがフィルム面に相当する。 An image pickup apparatus including a zoom lens to which the present invention is applied has a light incident from the object side of the zoom lens finally disposed on an image plane IP, for example, a CCD (Charge Coupled Device) or a CMOS (Complementary Mental-Oxide Semiconductor). device) is imaged on an imaging surface of a solid-state imaging device (photoelectric conversion device) such as a sensor. The imaging device photoelectrically converts the light received by the solid-state imaging device and outputs it as an electrical signal to generate a digital image corresponding to the image of the subject, for example, an HDD (Hard Disk Drive), a memory card, an optical disk, etc. Recording is performed on a recording medium such as a magnetic tape. When the imaging device is a silver salt film camera, the image plane IP corresponds to the film plane.
以下、実施例により本発明の効果をより明らかなものとする。なお、本発明は、以下の実施例に限定されるものではなく、その要旨を変更しない範囲で適宜変更して実施することができる。 Hereinafter, the effects of the present invention will be made clearer by examples. In addition, this invention is not limited to a following example, In the range which does not change the summary, it can change suitably and can implement.
(実施例1)
実施例1の設計データに基づくズームレンズの構成を図2に示す。なお、図2に示す実施例1のズームレンズは、上記図1に示すズームレンズと同様の構成であり、このズームレンズの設計データについては、以下の表1に示すとおりである。
Example 1
The configuration of the zoom lens based on the design data of Example 1 is shown in FIG. The zoom lens of Example 1 shown in FIG. 2 has the same configuration as the zoom lens shown in FIG. 1, and the design data of this zoom lens is as shown in Table 1 below.
なお、表1中に示す面番号「i(iは自然数を表す。)は、ズームレンズを構成する各レンズのうち、最も物体側に位置するレンズのレンズ面を1番目として、像面側に向かうに従い順次増加するレンズ面の番号を示している。
また、表1中に示すレンズ「GjRk(jは自然数、kは1又は2を表す。)」のうち、Gは、ズームレンズを構成する各レンズのうち、最も物体側に位置するレンズを1番目として、像面側に向かうに従い順次増加するレンズの番号を示している。一方、Rは、各レンズの物体側のレンズ面を1とし、像面側のレンズ面を2として示している。なお、「絞り」と「光学ブロック(平面)」についても併せて表記する。
また、表1中に示す「R」は、各面番号に対応したレンズ面の曲率半径[mm](但し、Rの値が∞となる面は、その面が平面であることを示す。)を示している。
また、表1中に示す「D」は、物体側からi番目のレンズ面とi+1番目のレンズ面との軸上面間隔[mm]を示し、可変となる場合は、広角端、中間焦点位置、望遠端での軸上面間隔[mm]を示している。なお、広角端、中間焦点位置、望遠端での「焦点距離」と「Fナンバー」を併せて表記する。
また、表1中に示す「Nd」は、各レンズの屈折率を示している。
また、表1中に示す「νd」は、各レンズのアッベ数を示している。
また、表1には、(1)「νd22」、(2)「R22a/R22b」、(3)「|f2/f1|」、(4)「fw/f2 」、(5)「νd 13 」、(6)「βt2」、(7)「Σd/ft」、(8)「Dw/f2」の各条件式を示している。
また、表1には、非球面とされたレンズの面番号と、その非球面係数を示している。なお、非球面は、以下の非球面式xにより表すことができる。
The surface number “i” (i represents a natural number) shown in Table 1 indicates that the lens surface of the lens closest to the object side among the lenses constituting the zoom lens is the first lens surface, and is on the image surface side. The number of the lens surface which increases sequentially as it goes is shown.
Further, among the lenses “GjRk (j is a natural number, k represents 1 or 2)” shown in Table 1, G is a lens that is located closest to the object among the lenses that constitute the zoom lens. As the second, the numbers of the lenses that sequentially increase toward the image plane side are shown. On the other hand, R indicates that the lens surface on the object side of each lens is 1, and the lens surface on the image plane side is 2. “Aperture” and “optical block (plane)” are also described together.
In addition, “R” shown in Table 1 is the curvature radius [mm] of the lens surface corresponding to each surface number (however, a surface where the value of R is ∞ indicates that the surface is a plane). Is shown.
“D” shown in Table 1 indicates an axial upper surface distance [mm] between the i-th lens surface and the i + 1-th lens surface from the object side, and when variable, the wide-angle end, the intermediate focal position, The axial upper surface distance [mm] at the telephoto end is shown. Note that “focal length” and “F number” at the wide-angle end, the intermediate focal position, and the telephoto end are also described together.
Further, “Nd” shown in Table 1 indicates the refractive index of each lens.
“Νd” shown in Table 1 indicates the Abbe number of each lens.
Table 1 also shows (1) “νd 22 ”, (2) “R 22a / R 22b ”, (3) “| f 2 / f 1 |”, (4) “f w / f 2 ”, (5) “ νd 13 ”, (6) “β t2 ”, (7) “Σ d / f t ”, (8) “D w / f 2 ”.
Table 1 shows the surface numbers of the aspherical lenses and their aspherical coefficients. The aspheric surface can be represented by the following aspheric expression x.
以上のように構成される実施例1のズームレンズによる球面収差図、非点収差図、歪曲収差図、倍率色収差図を図3、図4及び図5に示す。 FIG. 3, FIG. 4 and FIG. 5 show spherical aberration diagrams, astigmatism diagrams, distortion aberration diagrams, and lateral chromatic aberration diagrams by the zoom lens of Example 1 configured as described above.
なお、図3は、広角端での諸収差図、図4は、中間焦点位置での諸収差図、図5は、望遠端での諸収差図を示す。
球面収差図は、d線(波長587.56nm)における球面収差を実線、近赤外域(波長850nm)における球面収差を1点鎖線で示している。
非点収差図は、各波長におけるサジタル光線ΔS及びメジオナル光線ΔMに対する非点収差を示している。
歪曲収差図は、d線(波長587.56nm)における歪曲収差(ディストーション)を示している。
倍率色収差図は、g線(波長435.84nm)における色収差を示している。
3 shows various aberrations at the wide-angle end, FIG. 4 shows various aberrations at the intermediate focal position, and FIG. 5 shows various aberrations at the telephoto end.
In the spherical aberration diagram, the spherical aberration in the d-line (wavelength 587.56 nm) is indicated by a solid line, and the spherical aberration in the near infrared region (wavelength 850 nm) is indicated by a one-dot chain line.
The astigmatism diagram shows astigmatism with respect to sagittal ray ΔS and median ray ΔM at each wavelength.
The distortion diagram shows the distortion (distortion) at the d-line (wavelength 587.56 nm).
The lateral chromatic aberration diagram shows the chromatic aberration at the g-line (wavelength 435.84 nm).
実施例1のズームレンズは、表1に示すように、上記本発明の条件を満たすものである。そして、この実施例1のズームレンズについては、図3、図4及び図5に示すように、各収差が良好に補正されていることがわかる。 As shown in Table 1, the zoom lens of Example 1 satisfies the above-described conditions of the present invention. In the zoom lens of Example 1, it can be seen that each aberration is well corrected as shown in FIGS.
(実施例2)
実施例2の設計データに基づくズームレンズの構成を図6に示す。なお、図6に示す実施例2のズームレンズは、上記図1に示すズームレンズと同様の構成であり、この実施例2に示すズームレンズの設計データについては、以下の表2に示すとおりである。なお、表2の表記方法については、表1の場合と同様である。
(Example 2)
The configuration of the zoom lens based on the design data of Example 2 is shown in FIG. The zoom lens of Example 2 shown in FIG. 6 has the same configuration as the zoom lens shown in FIG. 1. The design data of the zoom lens shown in Example 2 is as shown in Table 2 below. is there. The notation method in Table 2 is the same as in Table 1.
以上のように構成される実施例2のズームレンズによる球面収差図、非点収差図、歪曲収差図、倍率色収差図を図7、図8及び図9に示す。なお、図7〜図9の表記方法については、図3〜図5の場合と同様である。 FIGS. 7, 8 and 9 show spherical aberration diagrams, astigmatism diagrams, distortion aberration diagrams, and magnification chromatic aberration diagrams of the zoom lens according to the second embodiment configured as described above. In addition, about the description method of FIGS. 7-9, it is the same as that of the case of FIGS.
実施例2のズームレンズは、表2に示すように、上記本発明の条件を満たすものである。そして、この実施例2のズームレンズについては、図7、図8及び図9に示すように、各収差が良好に補正されていることがわかる。 As shown in Table 2, the zoom lens of Example 2 satisfies the above-described conditions of the present invention. In the zoom lens of Example 2, it can be seen that each aberration is well corrected as shown in FIGS.
(実施例3)
実施例3の設計データに基づくズームレンズの構成を図10に示す。なお、図10に示す実施例3のズームレンズは、上記図1に示すズームレンズと同様の構成であり、この実施例3に示すズームレンズの設計データについては、以下の表3に示すとおりである。なお、表3の表記方法については、表1の場合と同様である。
(Example 3)
The configuration of the zoom lens based on the design data of Example 3 is shown in FIG. The zoom lens of Example 3 shown in FIG. 10 has the same configuration as the zoom lens shown in FIG. 1. The design data of the zoom lens shown in Example 3 is as shown in Table 3 below. is there. The notation in Table 3 is the same as in Table 1.
以上のように構成される実施例3のズームレンズによる球面収差図、非点収差図、歪曲収差図、倍率色収差図を図11、図12及び図13に示す。なお、図11〜図13の表記方法については、図3〜図5の場合と同様である。 FIG. 11, FIG. 12 and FIG. 13 show spherical aberration diagrams, astigmatism diagrams, distortion diagrams, and lateral chromatic aberration diagrams by the zoom lens of Example 3 configured as described above. In addition, about the description method of FIGS. 11-13, it is the same as that of the case of FIGS.
実施例3のズームレンズは、表3に示すように、上記本発明の条件を満たすものである。そして、この実施例3のズームレンズについては、図11、図12及び図13に示すように、各収差が良好に補正されていることがわかる。 As shown in Table 3, the zoom lens of Example 3 satisfies the above-described conditions of the present invention. As for the zoom lens of Example 3, it can be seen that each aberration is corrected well, as shown in FIGS.
(実施例4)
実施例4の設計データに基づくズームレンズの構成を図14に示す。なお、図14に示す実施例4のズームレンズは、上記図1に示すズームレンズと同様の構成であり、この実施例4に示すズームレンズの設計データについては、以下の表4に示すとおりである。なお、表4の表記方法については、表1の場合と同様である。
Example 4
The configuration of the zoom lens based on the design data of Example 4 is shown in FIG. The zoom lens of Example 4 shown in FIG. 14 has the same configuration as the zoom lens shown in FIG. 1, and the design data of the zoom lens shown in Example 4 is as shown in Table 4 below. is there. The notation in Table 4 is the same as in Table 1.
以上のように構成される実施例4のズームレンズによる球面収差図、非点収差図、歪曲収差図、倍率色収差図を図15、図16及び図17に示す。なお、図15〜図17の表記方法については、図3〜図5の場合と同様である。 FIGS. 15, 16, and 17 show spherical aberration diagrams, astigmatism diagrams, distortion diagrams, and lateral chromatic aberration diagrams of the zoom lens according to Example 4 configured as described above. In addition, about the description method of FIGS. 15-17, it is the same as that of the case of FIGS.
実施例4のズームレンズは、表4に示すように、上記本発明の条件を満たすものである。そして、この実施例4のズームレンズについては、図15、図16及び図17に示すように、各収差が良好に補正されていることがわかる。 As shown in Table 4, the zoom lens of Example 4 satisfies the above-described conditions of the present invention. In the zoom lens of Example 4, it can be seen that each aberration is well corrected as shown in FIGS.
(実施例5)
実施例5の設計データに基づくズームレンズの構成を図18に示す。なお、図18に示す実施例5のズームレンズは、上記第2のレンズ群L2を5枚のレンズ4〜8で構成したものであり、この実施例5に示すズームレンズの設計データについては、以下の表5に示すとおりである。なお、表5の表記方法については、表1の場合と同様である。
(Example 5)
The configuration of the zoom lens based on the design data of Example 5 is shown in FIG. In the zoom lens of Example 5 shown in FIG. 18, the second lens group L2 is composed of five
以上のように構成される実施例5のズームレンズによる球面収差図、非点収差図、歪曲収差図、倍率色収差図を図19、図20及び図21に示す。なお、図19〜図21の表記方法については、図3〜図5の場合と同様である。 FIG. 19, FIG. 20 and FIG. 21 show spherical aberration diagrams, astigmatism diagrams, distortion diagrams, and magnification chromatic aberration diagrams by the zoom lens of Example 5 configured as described above. In addition, about the description method of FIGS. 19-21, it is the same as that of the case of FIGS.
実施例5のズームレンズは、表5に示すように、上記本発明の条件を満たすものである。そして、この実施例5のズームレンズについては、図19、図20及び図21に示すように、各収差が良好に補正されていることがわかる。 As shown in Table 5, the zoom lens of Example 5 satisfies the above-described conditions of the present invention. In the zoom lens of Example 5, as shown in FIGS. 19, 20, and 21, it can be seen that each aberration is corrected satisfactorily.
L1…第1レンズ群 L2…第2レンズ群 1〜3…第1レンズ群を構成するレンズ 4〜7…第2レンズ群を構成するレンズ SP…絞り G…光学ブロック IP…像面 L1 ... 1st lens group L2 ... 2nd lens group 1-3 ... Lens which comprises 1st lens group 4-7 ... Lens which comprises 2nd lens group SP ... Diaphragm G ... Optical block IP ... Image plane
Claims (8)
前記第1レンズ群は、3枚のレンズから構成され、前記第2レンズ群は、少なくとも4枚以上のレンズから構成されており、
前記第2レンズ群において、最も物体側に位置するレンズの少なくとも一方のレンズ面が非球面とされ、
像側レンズ面が正の曲率半径を有し、前記第2レンズ群の最も像面側に位置するレンズの少なくとも一方のレンズ面が非球面とされ、
像側レンズ面が正の曲率半径を有し、前記第2レンズ群の物体側から3番目に位置するレンズの物体側のレンズ面が凸面とされ、
前記第2レンズ群の物体側から2番目に位置するレンズのアッベ数をνd22、物体側のレンズ面の曲率半径をR22a、像側レンズ面の曲率半径をR22bとしたときに、
65<νd22、
R22a/R22b<0
の関係を満足することを特徴とするズームレンズ。 In order from the object side, a first lens group having a negative refractive power as a whole and a second lens group having a positive refractive power as a whole are provided between the first lens group and the second lens group. A zoom lens in which an aperture is disposed and zooming is performed by changing an interval between the first lens group and the second lens group,
The first lens group is composed of three lenses, and the second lens group is composed of at least four or more lenses ,
In the second lens group, at least one lens surface of the lens located closest to the object side is an aspherical surface,
The image side lens surface has a positive radius of curvature, and at least one lens surface of the lens located closest to the image plane of the second lens group is an aspherical surface;
The image side lens surface has a positive radius of curvature, and the lens surface on the object side of the lens located third from the object side of the second lens group is a convex surface,
When the Abbe number of the lens located second from the object side of the second lens group is νd 22 , the radius of curvature of the lens surface on the object side is R 22a , and the radius of curvature of the image side lens surface is R 22b ,
65 <νd 22 ,
R 22a / R 22b <0
A zoom lens characterized by satisfying the above relationship.
1.0 <|f2/f1|<1.5
の関係を満足することを特徴とする請求項1に記載のズームレンズ。 When the combined focal length of the first lens group is f 1 and the combined focal length of the second lens group is f 2 ,
1.0 <| f 2 / f 1 | <1.5
The zoom lens according to claim 1, wherein the following relationship is satisfied.
0.2<fw/f2 <0.4
の関係を満足することを特徴とする請求項1又は2に記載のズームレンズ。 When the focal length of the entire system at the wide angle end is f w and the combined focal length of the second lens group is f 2 ,
0.2 <f w / f 2 <0.4
The zoom lens according to claim 1, wherein the zoom lens satisfies the following relationship.
25>νd13
の関係を満足することを特徴とする請求項1〜3の何れか一項に記載のズームレンズ。 It has a refractive power lens is positive positioned closest to the image side of the first lens group, and the Abbe number of the lens when the [nu] d 13,
25> νd 13
The zoom lens according to claim 1, wherein the zoom lens satisfies the following relationship.
−1.5<βt2<−1.0
の関係を満足することを特徴とする請求項1〜4の何れか一項に記載のズームレンズ。 When the paraxial imaging magnification of the second lens group at the telephoto end is β t2 ,
−1.5 <β t2 <−1.0
The zoom lens according to claim 1, wherein the following relationship is satisfied.
4.0<Σd/ft<6.5
の関係を満足することを特徴とする請求項1〜5の何れか一項に記載のズームレンズ。 The distance sigma d on the optical axis from the vertex of the object side to the image plane of the first lens lens position most on the object side of the group, the focal length of the entire system at the telephoto end when a f t,
4.0 <Σ d / f t <6.5
The zoom lens according to claim 1, wherein the following relationship is satisfied.
広角端における前記絞りから前記第2レンズ群の第1主点までの距離をDw、前記第2レンズ群の合成焦点距離をf2としたときに、
0.8<Dw/f2<1.3
の関係を満足することを特徴とする請求項1〜6の何れか一項に記載のズームレンズ。 The diaphragm is disposed between the first lens group and the second lens group with a fixed distance to the image plane so as not to move during zooming.
When the distance from the stop at the wide angle end to the first principal point of the second lens group is D w , and the combined focal length of the second lens group is f 2 ,
0.8 <D w / f 2 <1.3
The zoom lens according to claim 1, wherein the zoom lens satisfies the following relationship.
前記ズームレンズにより結像された像を撮像する固体撮像素子とを備えた撮像装置。 The zoom lens according to any one of claims 1 to 7,
An image pickup apparatus comprising: a solid-state image pickup device that picks up an image formed by the zoom lens.
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JP2010243942A JP5718020B2 (en) | 2010-10-29 | 2010-10-29 | Zoom lens and imaging device |
KR1020110095820A KR101314329B1 (en) | 2010-10-29 | 2011-09-22 | Zoom lens and photographing apparatus using the same |
US13/285,117 US8724232B2 (en) | 2010-10-29 | 2011-10-31 | Zoom lens and photographing apparatus including the same |
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JP2010243942A JP5718020B2 (en) | 2010-10-29 | 2010-10-29 | Zoom lens and imaging device |
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JP6325772B2 (en) * | 2013-03-29 | 2018-05-16 | キヤノン株式会社 | Imaging lens and imaging apparatus having the same |
KR102092319B1 (en) | 2014-05-26 | 2020-03-23 | 한화테크윈 주식회사 | Zoom lens system |
KR102422126B1 (en) | 2015-06-09 | 2022-07-18 | 한화테크윈 주식회사 | Zoom lens system |
CN110426816B (en) * | 2019-08-02 | 2024-04-30 | 佛山科学技术学院 | Miniaturized panorama day night confocal optical system |
CN113376802B (en) * | 2021-06-16 | 2022-10-14 | 嘉兴中润光学科技股份有限公司 | DV lens and image pickup device |
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JP4596418B2 (en) * | 2004-09-27 | 2010-12-08 | 富士フイルム株式会社 | Variable magnification optical system |
JP2006119574A (en) * | 2004-09-27 | 2006-05-11 | Fujinon Corp | Variable magnification optical system |
JP4859178B2 (en) | 2005-09-21 | 2012-01-25 | オリンパスイメージング株式会社 | Two-group zoom lens, interchangeable lens having the same, and electronic imaging apparatus having the same |
JP4905779B2 (en) * | 2006-09-07 | 2012-03-28 | 富士フイルム株式会社 | Zoom lens |
JP2008310035A (en) | 2007-06-14 | 2008-12-25 | Konica Minolta Opto Inc | Variable power optical system, imaging apparatus and digital equipment |
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