JP2011039439A - Zoom lens - Google Patents
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- JP2011039439A JP2011039439A JP2009189203A JP2009189203A JP2011039439A JP 2011039439 A JP2011039439 A JP 2011039439A JP 2009189203 A JP2009189203 A JP 2009189203A JP 2009189203 A JP2009189203 A JP 2009189203A JP 2011039439 A JP2011039439 A JP 2011039439A
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Abstract
Description
この発明は、デジタルカメラなどの撮像装置に搭載するのに最適な、広角、高倍率のズームレンズに関する。 The present invention relates to a wide-angle, high-magnification zoom lens that is optimal for mounting on an imaging apparatus such as a digital camera.
近年、デジタルカメラなどにおいて、より一層の小型化とともに高変倍化が要求されている。この要求に応えるために、小型、高倍率のズームレンズが提案されている(たとえば、特許文献1、2を参照。)。
In recent years, digital cameras and the like are required to be further miniaturized and to have a high zoom ratio. In order to meet this requirement, a compact, high-magnification zoom lens has been proposed (see, for example,
特許文献1,2に記載のズームレンズは、物体側から順に、少なくとも、正、負、正、正の屈折力を有する4つのレンズ群が配置された高倍率ズームレンズである。特に、特許文献1に記載のズームレンズは、広角端において77°を超える画角と、約9.4倍の変倍を行うことを実現したものである。また、特許文献2に記載のズームレンズは、広角端において61°を超える画角と、約9.5倍の変倍を行うことを実現したものである。
The zoom lenses described in
特許文献1および特許文献2に記載されたズームレンズは、いずれも9倍以上の高変倍を実現するものであるが、レンズ径が比較的大きいため、より小型化が要求されている撮像装置に対応できないという問題がある。また、画角80°未満と狭く、不十分である。
The zoom lenses described in
この発明は、上述した従来技術による問題点を解消するため、小型でありながらも、広い画角の確保と、高変倍が可能なズームレンズを提供することを目的とする。 An object of the present invention is to provide a zoom lens that can secure a wide angle of view and can achieve a high zoom ratio, while being small in size, in order to solve the above-described problems caused by the prior art.
上述した課題を解決し、目的を達成するため、請求項1の発明にかかるズームレンズは、物体側から順に配置された、正の屈折力を有する第1レンズ群と、負の屈折力を有する第2レンズ群と、正の屈折力を有する第3レンズ群と、正の屈折力を有する第4レンズ群と、を含み構成され、広角端における、前記第2レンズ群を構成するレンズの最結像面側面と前記第3レンズ群を構成するレンズの最物体側面との間隔をD23W、広角端における光学全系の焦点距離(無限遠物点合焦時)をFWとするとき、以下の条件式を満足することを特徴とする。
(1) 2.0≦D23W/FW≦3.0
In order to solve the above-described problems and achieve the object, a zoom lens according to a first aspect of the present invention has a first lens group having a positive refractive power and a negative refractive power arranged in order from the object side. A second lens group, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power, and is configured to include the second lens group at the wide-angle end. When the distance between the imaging surface side surface and the most object side surface of the lens constituting the third lens group is D23W, and the focal length of the entire optical system at the wide-angle end (when focusing on an infinite object point) is FW, It satisfies the conditional expression.
(1) 2.0 ≦ D23W / FW ≦ 3.0
この請求項1に記載の発明によれば、特に光学系中最も大きくなりがちな前記第1レンズ群の口径を小さくすることで光学系全体の小型化を図り、しかも広角化を達成できる。 According to the first aspect of the present invention, it is possible to reduce the size of the entire optical system by reducing the aperture of the first lens group, which tends to be the largest in the optical system, and to achieve a wide angle.
また、請求項2の発明にかかるズームレンズは、請求項1に記載の発明において、前記第1レンズ群の焦点距離をF1、前記第2レンズ群の焦点距離をF2とするとき、以下の条件式を満足することを特徴とする。
(2) 5.7≦|F1/F2|≦10
A zoom lens according to a second aspect of the present invention is the zoom lens according to the first aspect, wherein the first lens group has a focal length F1 and the second lens group has a focal length F2. It is characterized by satisfying the formula.
(2) 5.7 ≦ | F1 / F2 | ≦ 10
この請求項2に記載の発明によれば、前記第1レンズ群の口径の小型化と、広角化を達成し、さらに全変倍域に亘り光学性能の向上を図ることができる。 According to the second aspect of the present invention, it is possible to achieve a reduction in the diameter and wide angle of the first lens group, and it is possible to improve the optical performance over the entire zooming range.
また、請求項3の発明にかかるズームレンズは、請求項1または2に記載の発明において、広角端における光学系の全長(最物体側面から結像面までの距離)をTaW、望遠端における光学系の全長(最物体側面から結像面までの距離)をTaT、広角端における光学系の半画角をωW、広角端における光学系の近軸最大像高をYmaxとするとき、以下の条件式を満足することを特徴とする。
(3) 15≦(TaW+TaT)/(tan(ωW)×Ymax)≦33
A zoom lens according to a third aspect of the present invention is the zoom lens according to the first or second aspect, wherein the total length of the optical system at the wide-angle end (the distance from the most object side surface to the imaging surface) is TaW, and the optical at the telephoto end. When the total length of the system (distance from the most object side surface to the imaging surface) is TaT, the half angle of view of the optical system at the wide angle end is ωW, and the paraxial maximum image height of the optical system at the wide angle end is Ymax, the following conditions are satisfied. It is characterized by satisfying the formula.
(3) 15 ≦ (TaW + TaT) / (tan (ωW) × Ymax) ≦ 33
この請求項3に記載の発明によれば、前記第1レンズ群の口径の小型化と、広角化を達成したうえで、より高変倍が可能になる。 According to the third aspect of the present invention, it is possible to achieve a higher zoom ratio while achieving a reduction in the diameter and a wide angle of the first lens group.
この発明によれば、小型、広角で、全変倍域において優れた光学性能を備え、高変倍が可能なズームレンズを提供することができるという効果を奏する。 According to the present invention, there is an effect that it is possible to provide a zoom lens that is small, wide-angle, has excellent optical performance in the entire zoom range, and is capable of high zooming.
以下、添付図面を参照して、この発明にかかるズームレンズの好適な実施の形態を詳細に説明する。 Preferred embodiments of a zoom lens according to the present invention will be described below in detail with reference to the accompanying drawings.
この実施の形態にかかるズームレンズは、物体側から順に配置された、正の屈折力を有する第1レンズ群と、負の屈折力を有する第2レンズ群と、正の屈折力を有する第3レンズ群と、正の屈折力を有する第4レンズ群と、を含み構成される。この実施の形態のズームレンズは、前記第1レンズ群〜前記第3レンズ群を光軸に沿って移動させることによって、広角端から望遠端への変倍を行う。また、前記第4レンズ群を光軸に沿って移動させることによって、変倍に伴う結像面変動(結像位置)の補正やフォーカシングを行う。 The zoom lens according to this embodiment includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens having a positive refractive power, which are arranged in order from the object side. It includes a lens group and a fourth lens group having a positive refractive power. The zoom lens according to this embodiment performs zooming from the wide-angle end to the telephoto end by moving the first to third lens groups along the optical axis. Further, by moving the fourth lens group along the optical axis, correction and focusing of an imaging plane variation (imaging position) accompanying zooming is performed.
この発明は、小型、広角で、高い光学性能を備え、高変倍が可能なズームレンズを提供することを目的としている。そこで、かかる目的を達成するため、以下に示すような各種条件を設定している。 An object of the present invention is to provide a zoom lens that is small, wide-angle, has high optical performance, and is capable of high zooming. Therefore, in order to achieve this purpose, various conditions as shown below are set.
まず、この実施の形態にかかるズームレンズは、広角端における、前記第2レンズ群を構成するレンズの最結像面側面と前記第3レンズ群を構成するレンズの最物体側面との間隔をD23W、広角端における光学全系の焦点距離(無限遠物点合焦時)をFWとするとき、次の条件式を満足することが好ましい。
(1) 2.0≦D23W/FW≦3.0
First, in the zoom lens according to this embodiment, the distance between the most image forming side surface of the lens constituting the second lens group and the most object side surface of the lens constituting the third lens group at the wide angle end is set to D23W. When the focal length of the entire optical system at the wide-angle end (when focusing on an object point at infinity) is FW, it is preferable that the following conditional expression is satisfied.
(1) 2.0 ≦ D23W / FW ≦ 3.0
条件式(1)は、広角端において80°以上の広い画角を確保したうえで、前記第1レンズ群の有効径を小さくするための条件を規定するための式である。この条件式(1)を満足することにより、80°以上の広角化と前記第1レンズ群の口径の小型化との両立が可能になる。条件式(1)においてその下限を下回ると、前記第1レンズ群の有効径を小さくすることで前記第1レンズ群の口径の小型化は達成できるが、80°以上の広い画角を確保することが困難になる。一方、条件式(1)においてその上限を超えると、広角端における前記第1レンズ群の有効径が大きくなってしまい、前記第1レンズ群の口径の小型化が困難になる。 Conditional expression (1) is an expression for defining a condition for reducing the effective diameter of the first lens group after securing a wide angle of view of 80 ° or more at the wide-angle end. By satisfying conditional expression (1), it is possible to achieve both a wide angle of 80 ° or more and a reduction in the diameter of the first lens group. If the lower limit of conditional expression (1) is not reached, the effective diameter of the first lens group can be reduced to reduce the diameter of the first lens group, but a wide angle of view of 80 ° or more is ensured. It becomes difficult. On the other hand, if the upper limit in conditional expression (1) is exceeded, the effective diameter of the first lens group at the wide angle end becomes large, and it becomes difficult to reduce the aperture of the first lens group.
また、この実施の形態にかかるズームレンズは、前記第1レンズ群の焦点距離をF1、前記第2レンズ群の焦点距離をF2とするとき、次の条件式を満足することが好ましい。
(2) 5.7≦|F1/F2|≦10
In the zoom lens according to this embodiment, it is preferable that the following conditional expression is satisfied when the focal length of the first lens group is F1 and the focal length of the second lens group is F2.
(2) 5.7 ≦ | F1 / F2 | ≦ 10
条件式(2)は、前記第1レンズ群の有効径の小型化、広角端における広角化、全変倍域における高い光学性能の維持のための条件を規定する式である。条件式(2)においてその下限を下回ると、光学性能は維持できるが、前記第1レンズ群の有効径の小型化と、広角端における広角化を実現することが困難になる。一方、条件式(2)においてその上限を超えると、前記第2レンズ群のパワーが強くなるため、前記第1レンズ群の口径の小型化、および広角化を実現することは容易になるが、諸収差の補正が困難になる。 Conditional expression (2) defines the conditions for reducing the effective diameter of the first lens group, widening the wide-angle end, and maintaining high optical performance over the entire zoom range. If the lower limit of conditional expression (2) is not reached, the optical performance can be maintained, but it becomes difficult to reduce the effective diameter of the first lens group and to widen the wide-angle end. On the other hand, if the upper limit of conditional expression (2) is exceeded, the power of the second lens group becomes strong, so that it is easy to reduce the diameter and widen the angle of the first lens group. Correction of various aberrations becomes difficult.
また、この実施の形態にかかるズームレンズは、広角端における光学系の全長(最物体側面から結像面までの距離)をTaW、望遠端における光学系の全長(最物体側面から結像面までの距離)をTaT、広角端における光学系の半画角をωW、広角端における光学系の近軸最大像高をYmaxとするとき、次の条件式を満足することが好ましい。
(3) 15≦(TaW+TaT)/(tan(ωW)×Ymax)≦33
In the zoom lens according to this embodiment, the total length of the optical system at the wide-angle end (distance from the most object side surface to the imaging surface) is TaW, and the total length of the optical system at the telephoto end (from the most object side surface to the imaging surface). It is preferable that the following conditional expression is satisfied, where TaT is TaT, the half angle of view of the optical system at the wide angle end is ωW, and the paraxial maximum image height of the optical system at the wide angle end is Ymax.
(3) 15 ≦ (TaW + TaT) / (tan (ωW) × Ymax) ≦ 33
条件式(3)は、前記第1レンズ群の口径の小型化と、広角端における80°以上の画角を確保しながら、8倍以上の高変倍を実現するための条件を示す式である。条件式(3)においてその下限を下回ると、前記第1レンズ群の口径の小型化と広角端での広角化は実現可能であるが、8倍以上の高変倍を実現することが困難になる。一方、条件式(3)においてその上限を超えると、8倍以上の高変倍を実現することは可能であるが、前記第1レンズ群の口径の小型化と広角端での広角化を実現することが困難になる。 Conditional expression (3) is an expression showing conditions for realizing a high zoom ratio of 8 times or more while ensuring a reduction in the aperture of the first lens group and a field angle of 80 ° or more at the wide angle end. is there. If the lower limit of conditional expression (3) is not reached, it is possible to reduce the aperture of the first lens group and to widen the wide-angle end, but it is difficult to achieve a high zoom ratio of 8 times or more. Become. On the other hand, if the upper limit in conditional expression (3) is exceeded, it is possible to realize a high zoom ratio of 8 times or more, but a reduction in the aperture of the first lens group and a wide angle at the wide-angle end are realized. It becomes difficult to do.
以上説明したように、この実施の形態にかかるズームレンズは、上記条件式(1)を満足することで、小型の口径でありながらも、80°以上の広い画角を確保できる。さらに、上記条件式(2)を満足することで、小型、広角でありながら、全変倍域において高い光学性能を維持することが可能になる。さらに、上記条件式(3)を満足することで、小型、広角化と、高変倍が可能になる。 As described above, the zoom lens according to the present embodiment satisfies the conditional expression (1), so that a wide angle of view of 80 ° or more can be ensured even with a small aperture. Furthermore, by satisfying the conditional expression (2), it is possible to maintain high optical performance in the entire zooming range while being compact and wide-angle. Furthermore, by satisfying the conditional expression (3), it is possible to reduce the size, widen the angle, and achieve high zooming.
なお、上記各条件式はそのいずれかひとつが満足されていれば優れた効果が期待できることはすでに述べた通りである。しかし、上記各条件式をひとつよりも複数満足することにより、より優れたズームレンズを提供できる。 As described above, an excellent effect can be expected if any one of the conditional expressions is satisfied. However, a more excellent zoom lens can be provided by satisfying more than one of the above conditional expressions.
図1は、実施例1にかかるズームレンズの構成を示す光軸に沿う断面図である。このズームレンズは、図示しない物体側から順に、正の屈折力を有する第1レンズ群G11、負の屈折力を有する第2レンズ群G12、正の屈折力を有する第3レンズ群G13、および正の屈折力を有する第4レンズ群G14が配置されて構成される。また、第2レンズ群G12と第3レンズ群G13との間には、絞りSTPが配置されている。第4レンズ群G14と結像面IMGとの間には、カバーガラスCG(またはフィルタ)が配置されている。カバーガラスCG(またはフィルタ)は必要に応じて配置されるものであり、不要な場合は省略可能である。また、結像面IMGには、CCDやCMOSなどの撮像素子の受光面が配置される。 FIG. 1 is a cross-sectional view along the optical axis showing the configuration of the zoom lens according to the first embodiment. The zoom lens includes a first lens group G 11 having a positive refractive power, a second lens group G 12 having a negative refractive power, and a third lens group G 13 having a positive refractive power in order from an object side (not shown). , and a positive fourth lens group G 14 having a refractive power are arranged. Further, the second lens group G 12 between the third lens group G 13, stop STP is disposed. Between the fourth lens group G 14 and the image plane IMG, a cover glass CG (or filter) is disposed. The cover glass CG (or filter) is arranged as necessary, and can be omitted if unnecessary. In addition, a light receiving surface of an image sensor such as a CCD or a CMOS is disposed on the imaging plane IMG.
第1レンズ群G11は、前記物体側から順に、負レンズL111、正レンズL112、および正レンズL113が配置されて構成される。負レンズL111と正レンズL112とは、接合されている。 The first lens group G 11 includes a negative lens L 111 , a positive lens L 112 , and a positive lens L 113 arranged in order from the object side. The negative lens L 111 and the positive lens L 112 are cemented.
第2レンズ群G12は、前記物体側から順に、負レンズL121、負レンズL122、および正レンズL123が配置されて構成される。負レンズL121の両面と正レンズL123の結像面IMG側の面には、それぞれ非球面が形成されている。また、負レンズL122と正レンズL123とは、接合されている。 The second lens group G 12 includes a negative lens L 121 , a negative lens L 122 , and a positive lens L 123 arranged in this order from the object side. Aspherical surfaces are formed on both surfaces of the negative lens L 121 and the surface of the positive lens L 123 on the imaging surface IMG side. Further, the negative lens L 122 and the positive lens L 123 are cemented.
第3レンズ群G13は、前記物体側から順に、正レンズL131、負レンズL132、および正レンズL133が配置されて構成される。正レンズL131の前記物体側面には、非球面が形成されている。また、正レンズL131と負レンズL132とは、接合されている。 The third lens group G 13 includes a positive lens L 131 , a negative lens L 132 , and a positive lens L 133 arranged in order from the object side. An aspheric surface is formed on the object side surface of the positive lens L 131 . Further, the positive lens L 131 and the negative lens L 132 are cemented.
第4レンズ群G14は、正レンズL141により構成される。正レンズL141の両面には、それぞれ非球面が形成されている。 The fourth lens group G 14 is constituted by a positive lens L 141. Aspheric surfaces are formed on both surfaces of the positive lens L 141 .
このズームレンズは、第1レンズ群G11、第2レンズ群G12、および第3レンズ群G13を光軸に沿って移動させることによって、広角端から望遠端への変倍を行う。また、第4レンズ群G14を光軸に沿って移動させることによって、変倍に伴う結像面変動(結像位置)の補正やフォーカシングを行う。 This zoom lens performs zooming from the wide-angle end to the telephoto end by moving the first lens group G 11 , the second lens group G 12 , and the third lens group G 13 along the optical axis. Further, by moving along the fourth lens group G 14 to the optical axis is corrected and focusing of the focal plane variation due to zooming (imaging position).
以下、実施例1にかかるズームレンズに関する各種数値データを示す。 Various numerical data related to the zoom lens according to Example 1 will be described below.
ズームレンズ全系の焦点距離=4.365(広角端)〜13.109(中間ズーム位置)〜41.178(望遠端)
Fナンバ=3.58(広角端)〜4.84(中間ズーム位置)〜5.75(望遠端)
画角(2ω)=87.6°(広角端)〜33.6°(中間ズーム位置)〜10.56°(望遠端)
Focal length of the entire zoom lens = 4.365 (wide-angle end) to 13.109 (intermediate zoom position) to 41.178 (telephoto end)
F number = 3.58 (wide-angle end) to 4.84 (intermediate zoom position) to 5.75 (telephoto end)
Angle of view (2ω) = 87.6 ° (wide-angle end) to 33.6 ° (intermediate zoom position) to 10.56 ° (telephoto end)
(条件式(1)に関する数値)
広角端における第2レンズ群G12を構成するレンズの最結像面側面と第3レンズ群G13を構成するレンズの最物体側面との間隔(D23W)=11.532
D23W/FW=2.64
(Numerical value for conditional expression (1))
Distance between the most object side surface of lenses constituting the outermost imaging plane side and the third lens group G 13 of the lenses constituting the second lens group G 12 in the wide-angle end (D23W) = 11.532
D23W / FW = 2.64
(条件式(2)に関する数値)
第1レンズ群G11の焦点距離(F1)=35.5194
第2レンズ群G12の焦点距離(F2)=-5.8942
|F1/F2|=6.03
(Numerical value related to conditional expression (2))
The focal length of the first lens group G 11 (F1) = 35.5194
Focal length of the second lens group G 12 (F2) = - 5.8942
| F1 / F2 | = 6.03
(条件式(3)に関する数値)
広角端における光学系の全長(TaW)=38.5991
望遠端における光学系の全長(TaT)=55.5311
広角端における光学系の半画角(ωW)=43.80
広角端における光学系の近軸最大像高(Ymax)=4.1858
(TaW+TaT)/(tan(ωW)×Ymax)=23.45
(Numerical values related to conditional expression (3))
Total length of optical system at wide angle end (TaW) = 38.5991
Total length of optical system at the telephoto end (TaT) = 55.5311
Half angle of view of optical system at the wide angle end (ωW) = 43.80
Maximum paraxial image height (Ymax) of the optical system at the wide angle end = 4.1858
(TaW + TaT) / (tan (ωW) × Ymax) = 23.45
r1=42.4567
d1=0.7000 nd1=1.92286 νd1=20.88
r2=23.7410
d2=2.8893 nd2=1.61800 νd2=63.39
r3=123.2525
d3=0.1500
r4=24.3075
d4=2.2214 nd3=1.88300 νd3=40.80
r5=72.0512
d5=0.5000(広角端)〜8.4947(中間ズーム位置)〜19.7731(望遠端)
r6=18.2902(非球面)
d6=0.8000 nd4=1.85135 νd4=40.10
r7=4.1413(非球面)
d7=2.6217
r8=-104.4554
d8=0.4500 nd5=1.74330 νd5=49.22
r9=8.5587
d9=1.6559 nd6=2.00170 νd6=19.32
r10=31.8881(非球面)
d10=11.1821(広角端)〜3.0587(中間ズーム位置)〜0.1871(望遠端)
r11=∞(絞り)
d11=0.3500
r12=4.4041(非球面)
d12=1.1356 nd7=1.80611 νd7=40.73
r13=8.7508
d13=1.4251 nd8=1.94595 νd8=17.98
r14=4.0934
d14=0.3433
r15=10.1848
d15=1.1959 nd9=1.61800 νd9=63.39
r16=-10.1848
d16=3.5000(広角端)〜5.7939(中間ズーム位置)〜13.5388(望遠端)
r17=15.7815(非球面)
d17=1.5000 nd10=1.55332 νd10=71.67
r18=-1000.0000(非球面)
d18=4.4707(広角端)〜7.8402(中間ズーム位置)〜3.0627(望遠端)
r19=∞
d19=0.5000 nd11=1.51680 νd11=64.20
r20=∞
d20=1.0081(広角端)〜1.0126(中間ズーム位置)〜1.0311(望遠端)
r21=∞(結像面)
r 1 = 42.4567
d 1 = 0.7000 nd 1 = 1.92286 νd 1 = 20.88
r 2 = 23.7410
d 2 = 2.8893 nd 2 = 1.61800 νd 2 = 63.39
r 3 = 123.2525
d 3 = 0.1500
r 4 = 24.3075
d 4 = 2.2214 nd 3 = 1.88300 νd 3 = 40.80
r 5 = 72.0512
d 5 = 0.5000 (wide-angle end) to 8.4947 (intermediate zoom position) to 19.7731 (telephoto end)
r 6 = 18.2902 (aspherical surface)
d 6 = 0.8000 nd 4 = 1.85135 νd 4 = 40.10
r 7 = 4.1413 (aspherical surface)
d 7 = 2.6217
r 8 = -104.4554
d 8 = 0.4500 nd 5 = 1.74330 νd 5 = 49.22
r 9 = 8.5587
d 9 = 1.6559 nd 6 = 2.00170 νd 6 = 19.32
r 10 = 31.8881 (aspherical surface)
d 10 = 11.1821 (wide-angle end) to 3.0587 (intermediate zoom position) to 0.1871 (telephoto end)
r 11 = ∞ (aperture)
d 11 = 0.3500
r 12 = 4.4041 (aspherical surface)
d 12 = 1.1356 nd 7 = 1.80611 νd 7 = 40.73
r 13 = 8.7508
d 13 = 1.4251 nd 8 = 1.99455 νd 8 = 17.98
r 14 = 4.0934
d 14 = 0.3433
r 15 = 10.1848
d 15 = 1.1959 nd 9 = 1.61800 νd 9 = 63.39
r 16 = -10.1848
d 16 = 3.5000 (wide-angle end) to 5.7939 (intermediate zoom position) to 13.5388 (telephoto end)
r 17 = 15.7815 (aspherical surface)
d 17 = 1.5000 nd 10 = 1.55332 νd 10 = 71.67
r 18 = -1000.0000 (aspherical surface)
d 18 = 4.4707 (wide-angle end) to 7.8402 (intermediate zoom position) to 3.0627 (telephoto end)
r 19 = ∞
d 19 = 0.5000 nd 11 = 1.51680 νd 11 = 64.20
r 20 = ∞
d 20 = 1.0081 (wide-angle end) to 1.0126 (intermediate zoom position) to 1.0311 (telephoto end)
r 21 = ∞ (imaging plane)
円錐係数(K)および非球面係数(A,B,C,D)
(第6面)
K=0,
A=1.16028×10-4, B=-4.00446×10-5,
C=9.99964×10-7, D=-7.76320×10-9
(第7面)
K=-0.1858,
A=6.53494×10-4, B=2.25949×10-5,
C=-7.88249×10-6, D=7.04313×10-8
(第10面)
K=0,
A=-5.92227×10-4, B=4.38745×10-6,
C=1.94199×10-7, D=-1.48702×10-8
(第12面)
K=-0.5353,
A=9.52249×10-6, B=4.17341×10-5,
C=-8.84871×10-6, D=1.17972×10-6
(第17面)
K=-1.6970,
A=-6.34973×10-4, B=3.53883×10-5,
C=-2.81373×10-6, D=3.86441×10-8
(第18面)
K=0,
A=-6.44317×10-4, B=1.51939×10-5,
C=-1.68208×10-6, D=1.60171×10-8
Cone coefficient (K) and aspheric coefficient (A, B, C, D)
(Sixth surface)
K = 0,
A = 1.16028 × 10 −4 , B = −4.000446 × 10 −5 ,
C = 9.99964 × 10 -7 , D = -7.76320 × 10 -9
(Seventh side)
K = -0.1858,
A = 6.53494 × 10 −4 , B = 2.25949 × 10 −5 ,
C = -7.88249 × 10 -6 , D = 7.04313 × 10 -8
(Tenth aspect)
K = 0,
A = -5.92227 × 10 -4 , B = 4.38745 × 10 -6 ,
C = 1.94199 × 10 −7 , D = -1.48702 × 10 −8
(Twelfth surface)
K = -0.5353,
A = 9.52249 × 10 −6 , B = 4.17341 × 10 −5 ,
C = -8.84871 × 10 -6 , D = 1.17972 × 10 -6
(Seventeenth surface)
K = -1.6970,
A = -6.34973 × 10 -4 , B = 3.53883 × 10 -5 ,
C = -2.81373 × 10 -6 , D = 3.86441 × 10 -8
(18th page)
K = 0,
A = -6.44317 × 10 −4 , B = 1.51939 × 10 −5 ,
C = 1.68208 × 10 −6 , D = 1.60171 × 10 −8
また、図2は、実施例1にかかるズームレンズの諸収差図である。図中、gはg線(λ=435.83nm)、dはd線(λ=587.56nm)、CはC線(λ=656.27nm)に相当する波長の収差を表す。そして、非点収差図におけるΔS,ΔMは、それぞれサジタル像面、メリディオナル像面に対する収差を表す。 FIG. 2 is a diagram illustrating various aberrations of the zoom lens according to the first example. In the figure, g represents g-line (λ = 435.83 nm), d represents d-line (λ = 587.56 nm), and C represents aberration at a wavelength corresponding to C-line (λ = 656.27 nm). In the astigmatism diagrams, ΔS and ΔM represent aberrations with respect to the sagittal image surface and the meridional image surface, respectively.
図3は、実施例2にかかるズームレンズの構成を示す光軸に沿う断面図である。このズームレンズは、図示しない物体側から順に、正の屈折力を有する第1レンズ群G21、負の屈折力を有する第2レンズ群G22、正の屈折力を有する第3レンズ群G23、および正の屈折力を有する第4レンズ群G24が配置されて構成される。また、第2レンズ群G22と第3レンズ群G23との間には、絞りSTPが配置されている。第4レンズ群G24と結像面IMGとの間には、カバーガラスCG(またはフィルタ)が配置されている。カバーガラスCG(またはフィルタ)は必要に応じて配置されるものであり、不要な場合は省略可能である。また、結像面IMGには、CCDやCMOSなどの撮像素子の受光面が配置される。 FIG. 3 is a cross-sectional view along the optical axis showing the configuration of the zoom lens according to the second embodiment. The zoom lens includes a first lens group G 21 having a positive refractive power, a second lens group G 22 having a negative refractive power, and a third lens group G 23 having a positive refractive power in order from an object side (not shown). , And a fourth lens group G 24 having a positive refractive power is arranged. A stop STP is disposed between the second lens group G 22 and the third lens group G 23 . A cover glass CG (or filter) is disposed between the fourth lens group G 24 and the imaging plane IMG. The cover glass CG (or filter) is arranged as necessary, and can be omitted if unnecessary. In addition, a light receiving surface of an image sensor such as a CCD or a CMOS is disposed on the imaging plane IMG.
第1レンズ群G21は、前記物体側から順に、負レンズL211、正レンズL212、および正レンズL213が配置されて構成される。負レンズL211と正レンズL212とは、接合されている。 The first lens group G 21 includes a negative lens L 211 , a positive lens L 212 , and a positive lens L 213 arranged in order from the object side. The negative lens L 211 and the positive lens L 212 are cemented.
第2レンズ群G22は、前記物体側から順に、負レンズL221、負レンズL222、および正レンズL223が配置されて構成される。負レンズL221の両面と正レンズL223の結像面IMG側の面には、それぞれ非球面が形成されている。また、負レンズL222と正レンズL223とは、接合されている。 The second lens group G 22 includes, in order from the object side, a negative lens L 221, configured negative lens L 222, and the positive lens L 223 are arranged. Aspherical surfaces are formed on both surfaces of the negative lens L 221 and the surface of the positive lens L 223 on the imaging surface IMG side. Further, the negative lens L 222 and the positive lens L 223 are cemented.
第3レンズ群G23は、前記物体側から順に、正レンズL231、負レンズL232、および正レンズL233が配置されて構成される。正レンズL231の前記物体側面には、非球面が形成されている。また、正レンズL231と負レンズL232とは、接合されている。 The third lens group G 23 is constituted from said object side, a positive lens L 231, a negative lens L 232, and the positive lens L 233 is disposed. An aspheric surface is formed on the object side surface of the positive lens L 231 . Further, the positive lens L 231 and the negative lens L 232 are cemented.
第4レンズ群G24は、正レンズL241により構成される。正レンズL241の両面には、それぞれ非球面が形成されている。 The fourth lens group G 24 is constituted by a positive lens L 241. Aspherical surfaces are formed on both surfaces of the positive lens L241 .
このズームレンズは、第1レンズ群G21、第2レンズ群G22、および第3レンズ群G23を光軸に沿って移動させることによって、広角端から望遠端への変倍を行う。また、第4レンズ群G24を光軸に沿って移動させることによって、変倍に伴う結像面変動(結像位置)の補正やフォーカシングを行う。 This zoom lens performs zooming from the wide-angle end to the telephoto end by moving the first lens group G 21 , the second lens group G 22 , and the third lens group G 23 along the optical axis. Further, by moving along the fourth lens group G 24 to the optical axis is corrected and focusing of the focal plane variation due to zooming (imaging position).
以下、実施例2にかかるズームレンズに関する各種数値データを示す。 Various numerical data related to the zoom lens according to Example 2 will be described below.
ズームレンズ全系の焦点距離=4.378(広角端)〜13.059(中間ズーム位置)〜40.991(望遠端)
Fナンバ=3.58(広角端)〜4.88(中間ズーム位置)〜5.66(望遠端)
画角(2ω)=87.4°(広角端)〜33.12°(中間ズーム位置)〜10.56°(望遠端)
Focal length of the entire zoom lens = 4.378 (wide-angle end) to 13.059 (intermediate zoom position) to 40.991 (telephoto end)
F number = 3.58 (wide-angle end) to 4.88 (intermediate zoom position) to 5.66 (telephoto end)
Angle of view (2ω) = 87.4 ° (wide-angle end) to 33.12 ° (intermediate zoom position) to 10.56 ° (telephoto end)
(条件式(1)に関する数値)
広角端における第2レンズ群G22を構成するレンズの最結像面側面と第3レンズ群G23を構成するレンズの最物体側面との間隔(D23W)=11.363
D23W/FW=2.60
(Numerical value for conditional expression (1))
Distance between the most object side surface of lenses constituting the outermost imaging plane side and the third lens group G 23 of the lenses constituting the second lens group G 22 in the wide-angle end (D23W) = 11.363
D23W / FW = 2.60
(条件式(2)に関する数値)
第1レンズ群G21の焦点距離(F1)=35.3573
第2レンズ群G22の焦点距離(F2)=-5.7182
|F1/F2|=6.18
(Numerical value related to conditional expression (2))
The focal length of the first lens group G 21 (F1) = 35.3573
Focal length of the second lens group G 22 (F2) = - 5.7182
| F1 / F2 | = 6.18
(条件式(3)に関する数値)
広角端における光学系の全長(TaW)=38.7179
望遠端における光学系の全長(TaT)=55.4904
広角端における光学系の半画角(ωW)=43.70
広角端における光学系の近軸最大像高(Ymax)=4.1839
(TaW+TaT)/(tan(ωW)×Ymax)=23.56
(Numerical values related to conditional expression (3))
Total length of optical system at wide angle end (TaW) = 38.7179
Total length of optical system at the telephoto end (TaT) = 55.4904
Half angle of view (ωW) of the optical system at the wide angle end = 43.70
Maximum paraxial image height (Ymax) of the optical system at the wide angle end = 4.1839
(TaW + TaT) / (tan (ωW) × Ymax) = 23.56
r1=35.3665
d1=0.7000 nd1=1.92286 νd1=20.88
r2=22.7365
d2=2.8303 nd2=1.61800 νd2=63.39
r3=94.1318
d3=0.1500
r4=22.1345
d4=2.1521 nd3=1.78800 νd3=47.49
r5=57.3854
d5=0.5000(広角端)〜8.0817(中間ズーム位置)〜19.4548(望遠端)
r6=19.8247(非球面)
d6=0.8000 nd4=1.85639 νd4=40.10
r7=4.0732(非球面)
d7=2.6721
r8=701.8212
d8=0.4500 nd5=1.77250 νd5=49.62
r9=8.1000
d9=1.6506 nd6=2.01390 νd6=19.32
r10=27.7772(非球面)
d10=11.0131(広角端)〜3.0593(中間ズーム位置)〜0.1500(望遠端)
r11=∞(絞り)
d11=0.3500
r12=4.6428(非球面)
d12=1.3959 nd7=1.80610 νd7=40.74
r13=9.1218
d13=1.2040 nd8=1.94595 νd8=17.98
r14=4.3311
d14=0.3125
r15=9.9065
d15=1.2138 nd9=1.61800 νd9=63.39
r16=-9.9065
d16=4.2017(広角端)〜7.1778(中間ズーム位置)〜13.6497(望遠端)
r17=16.9814(非球面)
d17=1.5000 nd10=1.55516 νd10=71.67
r18=-224.2761(非球面)
d18=4.1129(広角端)〜7.3262(中間ズーム位置)〜3.4643(望遠端)
r19=∞
d19=0.5000 nd11=1.51680 νd11=64.20
r20=∞
d20=1.0090(広角端)〜0.9591(中間ズーム位置)〜0.8904(望遠端)
r21=∞(結像面)
r 1 = 35.3665
d 1 = 0.7000 nd 1 = 1.92286 νd 1 = 20.88
r 2 = 22.7365
d 2 = 2.8303 nd 2 = 1.61800 νd 2 = 63.39
r 3 = 94.1318
d 3 = 0.1500
r 4 = 22.1345
d 4 = 2.1521 nd 3 = 1.78800 νd 3 = 47.49
r 5 = 57.3854
d 5 = 0.5000 (wide-angle end) to 8.0817 (intermediate zoom position) to 19.4548 (telephoto end)
r 6 = 19.8247 (aspherical surface)
d 6 = 0.8000 nd 4 = 1.85639 νd 4 = 40.10
r 7 = 4.0732 (aspherical surface)
d 7 = 2.6721
r 8 = 701.8212
d 8 = 0.4500 nd 5 = 1.77250 νd 5 = 49.62
r 9 = 8.1000
d 9 = 1.6506 nd 6 = 2.01390 νd 6 = 19.32
r 10 = 27.7772 (aspherical surface)
d 10 = 11.0131 (wide-angle end) to 3.0593 (intermediate zoom position) to 0.1500 (telephoto end)
r 11 = ∞ (aperture)
d 11 = 0.3500
r 12 = 4.6428 (aspherical surface)
d 12 = 1.3959 nd 7 = 1.80610 νd 7 = 40.74
r 13 = 9.1218
d 13 = 1.2040 nd 8 = 1.99455 νd 8 = 17.98
r 14 = 4.3311
d 14 = 0.3125
r 15 = 9.9065
d 15 = 1.2138 nd 9 = 1.61800 νd 9 = 63.39
r 16 = -9.9065
d 16 = 4.2017 (wide-angle end) to 7.1778 (intermediate zoom position) to 13.6497 (telephoto end)
r 17 = 16.9814 (aspherical surface)
d 17 = 1.5000 nd 10 = 1.55516 νd 10 = 71.67
r 18 = -224.2761 (aspherical surface)
d 18 = 4.1129 (wide-angle end) to 7.3262 (intermediate zoom position) to 3.4643 (telephoto end)
r 19 = ∞
d 19 = 0.5000 nd 11 = 1.51680 νd 11 = 64.20
r 20 = ∞
d 20 = 1.0090 (wide-angle end) to 0.9591 (intermediate zoom position) to 0.8904 (telephoto end)
r 21 = ∞ (imaging plane)
円錐係数(K)および非球面係数(A,B,C,D)
(第6面)
K=0,
A=1.09571×10-4, B=-2.97768×10-5,
C=6.21695×10-7, D=-3.72502×10-9
(第7面)
K=-0.1858,
A=7.30061×10-4, B=3.77662×10-6,
C=-3.03192×10-6, D=-1.86011×10-7
(第10面)
K=0,
A=-6.01399×10-4, B=3.30880×10-6,
C=1.07326×10-7, D=-4.56889×10-10
(第12面)
K=-0.5322,
A=2.34771×10-5, B=1.08796×10-5,
C=-1.60048×10-6, D=5.07288×10-7
(第17面)
K=-4.3209,
A=-6.78620×10-4, B=3.28433×10-5,
C=-1.41788×10-6, D=-9.87708×10-9
(第18面)
K=0,
A=-8.87070×10-4, B=3.42669×10-5,
C=-1.76375×10-6, D=3.39007×10-9
Cone coefficient (K) and aspheric coefficient (A, B, C, D)
(Sixth surface)
K = 0,
A = 1.09571 × 10 -4 , B = -2.97768 × 10 -5 ,
C = 6.21695 × 10 −7 , D = −3.72502 × 10 −9
(Seventh side)
K = -0.1858,
A = 7.30061 × 10 −4 , B = 3.77662 × 10 −6 ,
C = -3.03192 × 10 -6 , D = -1.86011 × 10 -7
(Tenth aspect)
K = 0,
A = -6.01399 × 10 -4 , B = 3.30880 × 10 -6 ,
C = 1.07326 × 10 -7 , D = -4.56889 × 10 -10
(Twelfth surface)
K = -0.5322,
A = 2.34771 × 10 −5 , B = 1.08796 × 10 −5 ,
C = -1.60048 × 10 -6 , D = 5.07288 × 10 -7
(Seventeenth surface)
K = -4.3209,
A = -6.78620 × 10 −4 , B = 3.28433 × 10 −5 ,
C = -1.41788 × 10 -6 , D = -9.87708 × 10 -9
(18th page)
K = 0,
A = -8.87070 × 10 −4 , B = 3.42669 × 10 −5 ,
C = -1.76375 × 10 −6 , D = 3.39007 × 10 −9
また、図4は、実施例2にかかるズームレンズの諸収差図である。図中、gはg線(λ=435.83nm)、dはd線(λ=587.56nm)、CはC線(λ=656.27nm)に相当する波長の収差を表す。そして、非点収差図におけるΔS,ΔMは、それぞれサジタル像面、メリディオナル像面に対する収差を表す。 FIG. 4 is a diagram illustrating various aberrations of the zoom lens according to the second example. In the figure, g represents g-line (λ = 435.83 nm), d represents d-line (λ = 587.56 nm), and C represents aberration at a wavelength corresponding to C-line (λ = 656.27 nm). In the astigmatism diagrams, ΔS and ΔM represent aberrations with respect to the sagittal image surface and the meridional image surface, respectively.
図5は、実施例3にかかるズームレンズの構成を示す光軸に沿う断面図である。このズームレンズは、図示しない物体側から順に、正の屈折力を有する第1レンズ群G31、負の屈折力を有する第2レンズ群G32、正の屈折力を有する第3レンズ群G33、および正の屈折力を有する第4レンズ群G34が配置されて構成される。また、第2レンズ群G32と第3レンズ群G33との間には、絞りSTPが配置されている。第4レンズ群G34と結像面IMGとの間には、カバーガラスCG(またはフィルタ)が配置されている。カバーガラスCG(またはフィルタ)は必要に応じて配置されるものであり、不要な場合は省略可能である。また、結像面IMGには、CCDやCMOSなどの撮像素子の受光面が配置される。 FIG. 5 is a cross-sectional view along the optical axis showing the configuration of the zoom lens according to the third embodiment. The zoom lens includes a first lens group G 31 having a positive refractive power, a second lens group G 32 having a negative refractive power, and a third lens group G 33 having a positive refractive power in order from an object side (not shown). , And a fourth lens group G 34 having a positive refractive power is arranged. A stop STP is disposed between the second lens group G 32 and the third lens group G 33 . Between the fourth lens group G 34 and the image plane IMG, a cover glass CG (or filter) is disposed. The cover glass CG (or filter) is arranged as necessary, and can be omitted if unnecessary. In addition, a light receiving surface of an image sensor such as a CCD or a CMOS is disposed on the imaging plane IMG.
第1レンズ群G31は、前記物体側から順に、負レンズL311、正レンズL312、および正レンズL313が配置されて構成される。負レンズL311と正レンズL312とは、接合されている。 The first lens group G 31 includes a negative lens L 311 , a positive lens L 312 , and a positive lens L 313 arranged in order from the object side. The negative lens L 311 and the positive lens L 312 are cemented.
第2レンズ群G32は、前記物体側から順に、負レンズL321、負レンズL322、および正レンズL323が配置されて構成される。負レンズL321の両面と正レンズL323の結像面IMG側の面には、それぞれ非球面が形成されている。また、負レンズL322と正レンズL323とは、接合されている。 The second lens group G 32 includes, in order from the object side, a negative lens L 321, configured negative lens L 322, and the positive lens L 323 are arranged. Aspherical surfaces are formed on both surfaces of the negative lens L 321 and the surface of the positive lens L 323 on the imaging surface IMG side. Further, the negative lens L 322 and the positive lens L 323 are cemented.
第3レンズ群G33は、前記物体側から順に、正レンズL331、負レンズL332、および正レンズL333が配置されて構成される。正レンズL331の前記物体側面には、非球面が形成されている。また、正レンズL331と負レンズL332とは、接合されている。 The third lens group G 33 includes a positive lens L 331 , a negative lens L 332 , and a positive lens L 333 arranged in order from the object side. An aspheric surface is formed on the object side surface of the positive lens L331 . Further, the positive lens L 331 and the negative lens L 332 are cemented.
第4レンズ群G34は、正レンズL341により構成される。正レンズL341の両面には、それぞれ非球面が形成されている。 The fourth lens group G 34 includes a positive lens L 341 . Aspherical surfaces are formed on both surfaces of the positive lens L341 .
このズームレンズは、第1レンズ群G31、第2レンズ群G32、および第3レンズ群G33を光軸に沿って移動させることによって、広角端から望遠端への変倍を行う。また、第4レンズ群G34を光軸に沿って移動させることによって、変倍に伴う結像面変動(結像位置)の補正やフォーカシングを行う。 This zoom lens performs zooming from the wide-angle end to the telephoto end by moving the first lens group G 31 , the second lens group G 32 , and the third lens group G 33 along the optical axis. Further, by moving along the fourth lens group G 34 to the optical axis is corrected and focusing of the focal plane variation due to zooming (imaging position).
以下、実施例3にかかるズームレンズに関する各種数値データを示す。 Various numerical data relating to the zoom lens according to Example 3 will be described below.
ズームレンズ全系の焦点距離=4.381(広角端)〜13.307(中間ズーム位置)〜41.113(望遠端)
Fナンバ=3.60(広角端)〜4.82(中間ズーム位置)〜5.71(望遠端)
画角(2ω)=87.4°(広角端)〜33.12°(中間ズーム位置)〜10.56°(望遠端)
Focal length of the entire zoom lens = 4.381 (wide-angle end) to 13.307 (intermediate zoom position) to 41.113 (telephoto end)
F number = 3.60 (wide-angle end) to 4.82 (intermediate zoom position) to 5.71 (telephoto end)
Angle of view (2ω) = 87.4 ° (wide-angle end) to 33.12 ° (intermediate zoom position) to 10.56 ° (telephoto end)
(条件式(1)に関する数値)
広角端における第2レンズ群G32を構成するレンズの最結像面側面と第3レンズ群G33を構成するレンズの最物体側面との間隔(D23W)=10.771
D23W/FW=2.50
(Numerical value for conditional expression (1))
Distance between the most object side surface of lenses constituting the outermost imaging plane side and the third lens group G 33 of the lenses constituting the second lens group G 32 in the wide-angle end (D23W) = 10.771
D23W / FW = 2.50
(条件式(2)に関する数値)
第1レンズ群G31の焦点距離(F1)=35.4149
第2レンズ群G32の焦点距離(F2)=-5.6003
|F1/F2|=6.32
(Numerical value related to conditional expression (2))
The focal length of the first lens group G 31 (F1) = 35.4149
Focal length of the second lens group G 32 (F2) = - 5.6003
| F1 / F2 | = 6.32
(条件式(3)に関する数値)
広角端における光学系の全長(TaW)=38.1391
望遠端における光学系の全長(TaT)=55.6475
広角端における光学系の半画角(ωW)=43.70
広角端における光学系の近軸最大像高(Ymax)=4.1861
(TaW+TaT)/(tan(ωW)×Ymax)=23.45
(Numerical values related to conditional expression (3))
Total length of optical system at the wide-angle end (TaW) = 38.1391
Total length of optical system at the telephoto end (TaT) = 55.6475
Half angle of view (ωW) of the optical system at the wide angle end = 43.70
Maximum paraxial image height (Ymax) of the optical system at the wide angle end = 4.1861
(TaW + TaT) / (tan (ωW) × Ymax) = 23.45
r1=33.2686
d1=0.8000 nd1=1.84666 νd1=23.78
r2=19.8000
d2=3.0214 nd2=1.61800 νd2=63.39
r3=80.0497
d3=0.1500
r4=24.5713
d4=2.2786 nd3=1.78800 νd3=47.49
r5=78.2687
d5=0.5000(広角端)〜9.5000(中間ズーム位置)〜19.6766(望遠端)
r6=25.2886(非球面)
d6=0.8000 nd4=1.85135 νd4=40.10
r7=4.1057(非球面)
d7=2.4507
r8=562.3556
d8=0.4500 nd5=1.77250 νd5=49.62
r9=8.5000
d9=1.5324 nd6=2.00170 νd6=19.32
r10=31.7164(非球面)
d10=10.4212(広角端)〜3.2143(中間ズーム位置)〜0.1500(望遠端)
r11=∞(絞り)
d11=0.3500
r12=4.6699(非球面)
d12=1.1969 nd7=1.80610 νd7=40.74
r13=9.2400
d13=1.3621 nd8=1.94595 νd8=17.98
r14=4.4271
d14=0.3144
r15=10.8758
d15=1.2266 nd9=1.61800 νd9=63.39
r16=-9.1157
d16=4.0000(広角端)〜7.1658(中間ズーム位置)〜13.6403(望遠端)
r17=17.2904(非球面)
d17=1.5000 nd10=1.59201 νd10=67.02
r18=-500.0000(非球面)
d18=3.6718(広角端)〜6.6915(中間ズーム位置)〜3.2000(望遠端)
r19=∞
d19=0.5000 nd11=1.51680 νd11=64.20
r20=∞
d20=1.6130(広角端)〜1.0391(中間ズーム位置)〜1.0475(望遠端)
r21=∞(結像面)
r 1 = 33.2686
d 1 = 0.8000 nd 1 = 1.84666 νd 1 = 23.78
r 2 = 19.8000
d 2 = 3.0214 nd 2 = 1.61800 νd 2 = 63.39
r 3 = 80.0497
d 3 = 0.1500
r 4 = 24.5713
d 4 = 2.2786 nd 3 = 1.78800 νd 3 = 47.49
r 5 = 78.2687
d 5 = 0.5000 (wide-angle end) to 9.5000 (intermediate zoom position) to 19.6766 (telephoto end)
r 6 = 25.2886 (aspherical surface)
d 6 = 0.8000 nd 4 = 1.85135 νd 4 = 40.10
r 7 = 4.1057 (aspherical surface)
d 7 = 2.4507
r 8 = 562.3556
d 8 = 0.4500 nd 5 = 1.77250 νd 5 = 49.62
r 9 = 8.5000
d 9 = 1.5324 nd 6 = 2.00170 νd 6 = 19.32
r 10 = 31.7164 (aspherical surface)
d 10 = 10.4212 (wide-angle end) to 3.2143 (intermediate zoom position) to 0.1500 (telephoto end)
r 11 = ∞ (aperture)
d 11 = 0.3500
r 12 = 4.6699 (aspherical surface)
d 12 = 1.1969 nd 7 = 1.80610 νd 7 = 40.74
r 13 = 9.2400
d 13 = 1.3621 nd 8 = 1.94595 νd 8 = 17.98
r 14 = 4.4271
d 14 = 0.3144
r 15 = 10.8758
d 15 = 1.2266 nd 9 = 1.61800 νd 9 = 63.39
r 16 = -9.1157
d 16 = 4.0000 (wide-angle end) to 7.1658 (intermediate zoom position) to 13.6403 (telephoto end)
r 17 = 17.2904 (aspherical surface)
d 17 = 1.5000 nd 10 = 1.59201 νd 10 = 67.02
r 18 = -500.0000 (aspherical surface)
d 18 = 3.6718 (wide-angle end) to 6.6915 (intermediate zoom position) to 3.2000 (telephoto end)
r 19 = ∞
d 19 = 0.5000 nd 11 = 1.51680 νd 11 = 64.20
r 20 = ∞
d 20 = 1.6130 (wide-angle end) to 1.0391 (intermediate zoom position) to 1.0475 (telephoto end)
r 21 = ∞ (imaging plane)
円錐係数(K)および非球面係数(A,B,C,D)
(第6面)
K=0,
A=1.70699×10-4, B=-3.32288×10-5,
C=7.95002×10-7, D=-6.27099×10-9
(第7面)
K=-0.1858,
A=8.43675×10-4, B=6.56293×10-6,
C=-2.00670×10-6, D=-2.29541×10-7
(第10面)
K=0,
A=-5.64411×10-4, B=-1.75974×10-5,
C=1.70798×10-6, D=-3.89949×10-8
(第12面)
K=-0.5973,
A=-1.92725×10-5, B=8.22671×10-5,
C=-2.28281×10-5, D=2.78115×10-6
(第17面)
K=1.6141,
A=-5.92164×10-4, B=1.68205×10-5,
C=-7.73392×10-7, D=-2.40077×10-8
(第18面)
K=0,
A=-6.47064×10-4, B=2.16671×10-5,
C=-1.42681×10-6, D=-6.03161×10-10
Cone coefficient (K) and aspheric coefficient (A, B, C, D)
(Sixth surface)
K = 0,
A = 1.70699 × 10 −4 , B = −3.332288 × 10 −5 ,
C = 7.95002 × 10 -7 , D = -6.27099 × 10 -9
(Seventh side)
K = -0.1858,
A = 8.443675 × 10 −4 , B = 6.56293 × 10 −6 ,
C = -2.00670 × 10 -6 , D = -2.29541 × 10 -7
(Tenth aspect)
K = 0,
A = -5.64411 × 10 -4 , B = -1.75974 × 10 -5 ,
C = 1.70798 × 10 −6 , D = −3.889949 × 10 −8
(Twelfth surface)
K = -0.5973,
A = -1.92725 × 10 −5 , B = 8.22671 × 10 −5 ,
C = -2.28281 × 10 −5 , D = 2.78115 × 10 −6
(Seventeenth surface)
K = 1.6141,
A = -5.92164 × 10 -4 , B = 1.68205 × 10 -5 ,
C = -7.73392 × 10 -7 , D = -2.40077 × 10 -8
(18th page)
K = 0,
A = -6.47064 × 10 −4 , B = 2.16671 × 10 −5 ,
C = -1.42681 × 10 −6 , D = −6.03161 × 10 −10
また、図6は、実施例3にかかるズームレンズの諸収差図である。図中、gはg線(λ=435.83nm)、dはd線(λ=587.56nm)、CはC線(λ=656.27nm)に相当する波長の収差を表す。そして、非点収差図におけるΔS,ΔMは、それぞれサジタル像面、メリディオナル像面に対する収差を表す。 FIG. 6 is a diagram illustrating various aberrations of the zoom lens according to the third example. In the figure, g represents g-line (λ = 435.83 nm), d represents d-line (λ = 587.56 nm), and C represents aberration at a wavelength corresponding to C-line (λ = 656.27 nm). In the astigmatism diagrams, ΔS and ΔM represent aberrations with respect to the sagittal image surface and the meridional image surface, respectively.
なお、上記各実施例中の数値データにおいて、r1,r2,・・・・は各レンズ、絞り面などの曲率半径、d1,d2,・・・・は各レンズ、絞りなどの肉厚またはそれらの面間隔、nd1,nd2,・・・・は各レンズなどのd線(λ=587.56nm)における屈折率、νd1,νd2,・・・・は各レンズなどのd線(λ=587.56nm)におけるアッベ数を示している。 In the numerical data in each of the above embodiments, r 1 , r 2 ,... Are the curvature radii of the respective lenses and diaphragm surfaces, and d 1 , d 2 ,. Thickness or distance between them, nd 1 , nd 2 ,... Is the refractive index at d-line (λ = 587.56 nm) of each lens, νd 1 , νd 2 ,. The Abbe number at d line (λ = 587.56 nm) is shown.
また、上記各非球面形状は、非球面の深さをZ、光軸からの高さをyとし、光の進行方向を正とするとき、以下に示す式により表される。 Each of the aspheric shapes is represented by the following formula, where the depth of the aspheric surface is Z, the height from the optical axis is y, and the light traveling direction is positive.
ただし、Rは近軸曲率半径、Kは円錐係数、A,B,C,D,はそれぞれ4次,6次,8次,10次の非球面係数である。 Here, R is a paraxial radius of curvature, K is a conical coefficient, and A, B, C, and D are fourth-order, sixth-order, eighth-order, and tenth-order aspheric coefficients, respectively.
以上説明したように、上記各実施例のズームレンズは、上記各条件式を満足することで、小型の口径でありながらも、広い画角(80°以上)を確保でき、全変倍域において優れた光学性能を維持し、高変倍(8倍以上)が可能なズームレンズになる。 As described above, the zoom lens according to each of the embodiments can satisfy a wide range of angle of view (80 ° or more) while satisfying the above-described conditional expressions, while maintaining a small aperture. A zoom lens that maintains excellent optical performance and is capable of high magnification (8x or more).
以上のように、この発明のズームレンズは、デジタルカメラなどの撮像装置に有用であり、特に、小型、広角、高変倍が要求される場合に最適である。 As described above, the zoom lens of the present invention is useful for an imaging apparatus such as a digital camera, and is particularly suitable when a small size, a wide angle, and a high zoom ratio are required.
G11,G21,G31 第1レンズ群
G12,G22,G32 第2レンズ群
G13,G23,G33 第3レンズ群
G14,G24,G34 第4レンズ群
IMG 結像面
STP 絞り
CG カバーガラス
G 11 , G 21 , G 31 1st lens group G 12 , G 22 , G 32 2nd lens group G 13 , G 23 , G 33 3rd lens group G 14 , G 24 , G 34 4th lens group IMG connection Image surface STP Aperture CG Cover glass
Claims (3)
広角端における、前記第2レンズ群を構成するレンズの最結像面側面と前記第3レンズ群を構成するレンズの最物体側面との間隔をD23W、広角端における光学全系の焦点距離(無限遠物点合焦時)をFWとするとき、以下の条件式を満足することを特徴とするズームレンズ。
(1) 2.0≦D23W/FW≦3.0 A first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a positive refractive power, which are arranged in order from the object side. A fourth lens group,
The distance between the most imaging surface side surface of the lens constituting the second lens group and the most object side surface of the lens constituting the third lens group at the wide angle end is D23W, and the focal length of the entire optical system at the wide angle end (infinite A zoom lens characterized by satisfying the following conditional expression when the far object point is in focus (FW):
(1) 2.0 ≦ D23W / FW ≦ 3.0
(2) 5.7≦|F1/F2|≦10 2. The zoom lens according to claim 1, wherein the following conditional expression is satisfied, where F1 is a focal length of the first lens group and F2 is a focal length of the second lens group.
(2) 5.7 ≦ | F1 / F2 | ≦ 10
(3) 15≦(TaW+TaT)/(tan(ωW)×Ymax)≦33 The total length of the optical system at the wide-angle end (distance from the most object side surface to the imaging surface) is TaW, the total length of the optical system at the telephoto end (distance from the most object side surface to the imaging surface) is TaT, and the optical system at the wide-angle end. 3. The zoom lens according to claim 1, wherein the following conditional expression is satisfied, where ωW is a half field angle and Ymax is a paraxial maximum image height of the optical system at the wide-angle end.
(3) 15 ≦ (TaW + TaT) / (tan (ωW) × Ymax) ≦ 33
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CN201210041511.9A CN102540432B (en) | 2009-08-18 | 2010-07-22 | Zoom lens |
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JP2006308957A (en) * | 2005-04-28 | 2006-11-09 | Ricoh Co Ltd | Zoom lens and information device |
JP2009115874A (en) * | 2007-11-02 | 2009-05-28 | Nikon Corp | Zoom lens and optical apparatus with the zoom lens |
JP2009150970A (en) * | 2007-12-19 | 2009-07-09 | Canon Inc | Zoom lens and imaging device provided with it |
JP2009163068A (en) * | 2008-01-08 | 2009-07-23 | Olympus Imaging Corp | Zoom lens and imaging apparatus using the same |
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JP2004212618A (en) * | 2002-12-27 | 2004-07-29 | Nikon Corp | Variable focal length lens system |
JP2006308957A (en) * | 2005-04-28 | 2006-11-09 | Ricoh Co Ltd | Zoom lens and information device |
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JP2009150970A (en) * | 2007-12-19 | 2009-07-09 | Canon Inc | Zoom lens and imaging device provided with it |
JP2009163068A (en) * | 2008-01-08 | 2009-07-23 | Olympus Imaging Corp | Zoom lens and imaging apparatus using the same |
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