JP5722730B2 - Image stabilization zoom lens - Google Patents
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- JP5722730B2 JP5722730B2 JP2011184438A JP2011184438A JP5722730B2 JP 5722730 B2 JP5722730 B2 JP 5722730B2 JP 2011184438 A JP2011184438 A JP 2011184438A JP 2011184438 A JP2011184438 A JP 2011184438A JP 5722730 B2 JP5722730 B2 JP 5722730B2
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Description
本発明は、Ｆ２．８と明るく、手振れ補正機構を組み込むことができる、広角域を含む標準画角の明るい手振れ補正ズームレンズに関する。 The present invention relates to a camera shake correction zoom lens having a standard angle of view including a wide angle region, which is bright as F2.8 and can incorporate a camera shake correction mechanism.
近年の光学設計及び製造技術の進歩により、広角域を含む標準画角のズームレンズは、Ｆナンバーが小さい以下のズームレンズが提案させている。ここで、広角域とは、一般に半画角３１°〜４５°を示す。望遠域とは、一般に半画角１０°〜１９°を示す。標準画角とは、一般的に半画角２０°〜３０°を示す。 Due to advances in optical design and manufacturing technology in recent years, zoom lenses with a small F number have been proposed as zoom lenses having a standard angle of view including a wide angle region. Here, the wide-angle region generally indicates a half angle of view of 31 ° to 45 °. The telephoto area generally indicates a half angle of view of 10 ° to 19 °. The standard angle of view generally indicates a half angle of view of 20 ° to 30 °.
従来のズームレンズの一つは、
物体側から順に、正第１レンズ群Ｇ１と負第２レンズ群Ｇ２と正又は負第３レンズ群Ｇ３と正第４レンズ群Ｇ４を有し、レンズ群Ｇ１とＧ２、及びＧ２とＧ３、及びＧ３とＧ４との空気間隔を変化させることによって変倍するズームレンズにおいて、第２レンズ群Ｇ２は物体側から順に像側に凹面を向けた負レンズを含む負レンズＬ２１、物体側に凹面を向けた負レンズを有する負レンズＬ２２、正レンズＬ２ｐと負レンズＬ２ｎの接合よりなり、物体側に対して凸面を向けた接合正レンズＬ２ｐｎを含む正レンズＬ２３、物体側に凹面を向けた負レンズＬ２４とを有し、第４レンズ群Ｇ４は物体側から順に正レンズＬ４１と少なくとも１枚の非球面レンズＬaspを備える負レンズＬ４２とを有し、非球面レンズＬaspは所定の条件を満足する（例えば、特許文献１参照）である。
One of the conventional zoom lenses is
In order from the object side, there are a positive first lens group G1, a negative second lens group G2, a positive or negative third lens group G3, and a positive fourth lens group G4, and lens groups G1 and G2, G2 and G3, and In the zoom lens that changes the magnification by changing the air gap between G3 and G4, the second lens group G2 includes a negative lens L21 including a negative lens with a concave surface facing the image side in order from the object side, and a concave surface facing the object side. A negative lens L22 having a negative lens, a positive lens L23 including a cemented positive lens L2pn having a convex surface facing the object side, and a negative lens L24 having a concave surface facing the object side. The fourth lens group G4 includes, in order from the object side, a positive lens L41 and a negative lens L42 including at least one aspheric lens Lasp, and the aspheric lens Lasp satisfies a predetermined condition ( Eg to a Patent Document 1).
従来技術の他のズームレンズとしては、
正、負、正、正の４群ズーム方式で、広角端での撮影画角が約７５度、全ズーム域でのＦナンバーが約２．８、変倍比が約２．５倍を実現し、尚且つ一眼レフレックスカメラの標準ズームレンズに近い大きさ（レンズ全長：９５ｍｍ前後、対物側フィルター径：φ６７ｍｍ）で、光学性能の優れた、特に一眼レフレックスカメラ等の標準ズームレンズとして好適な大口径ズームレンズ（例えば、特許文献２参照）である。
Other zoom lenses in the prior art include
A positive, negative, positive, and positive four-group zoom system that achieves a shooting angle of view of approximately 75 degrees at the wide-angle end, an F-number of approximately 2.8 in the entire zoom range, and a zoom ratio of approximately 2.5. However, it is close in size to a standard zoom lens of a single lens reflex camera (lens total length: around 95 mm, objective side filter diameter: φ67 mm), and excellent in optical performance, particularly suitable as a standard zoom lens for a single lens reflex camera or the like. A large-aperture zoom lens (see, for example, Patent Document 2).
従来技術の他のズームレンズとしては、
物体側から順に、正の屈折力を持つ第１レンズ群、負の屈折力をもつ第２レンズ群、正の屈折力を持つ第３レンズ群、正の屈折力をもつ第４レンズ群を有し、広角端から望遠端への変倍により第１レンズ群と第２レンズ群の間隔が広がり、第２レンズ群と第３レンズ群の間隔が狭まり、第３レンズ群と第４レンズ群の間隔が狭まるように移動し、前記第３レンズ群が、物体側から順に、正の屈折力を持つ第３前群と、負の屈折力を持つ第３後群とからなり、手振れ発生時の像面補正は第３後群のみを光軸と直交する方向へ移動させることで行い、前記第４レンズ群が最も物体側に凹レンズを有する大口径ズームレンズ（例えば、特許文献３参照）である。
Other zoom lenses in the prior art include
In order from the object side, there are a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power. The distance from the wide-angle end to the telephoto end increases the distance between the first lens group and the second lens group, the distance between the second lens group and the third lens group decreases, and the third lens group and the fourth lens group. The third lens group is composed of a third front group having a positive refractive power and a third rear group having a negative refractive power in order from the object side. Image plane correction is performed by moving only the third rear group in a direction orthogonal to the optical axis, and the fourth lens group is a large-aperture zoom lens having a concave lens closest to the object side (see, for example, Patent Document 3). .
特許文献１に開示されているズームレンズは、Ｆナンバーが２．８程度であって明るいが、手振れ補正機構を配置する空間を作ることが困難であるため、手振れ補正機構を有していない。 The zoom lens disclosed in Patent Document 1 has a F-number of about 2.8 and is bright, but does not have a camera shake correction mechanism because it is difficult to create a space for arranging the camera shake correction mechanism.
特許文献２に開示されたズームレンズは、焦点距離が２４からのズームレンズであり、広角である。しかし、このズームレンズも手振れ補正機構を配置する空間を作ることが困難であるため、手振れ補正機構を有していない。 The zoom lens disclosed in Patent Document 2 is a zoom lens having a focal length of 24 and has a wide angle. However, this zoom lens also has no camera shake correction mechanism because it is difficult to create a space for installing the camera shake correction mechanism.
特許文献３に開示されたズームレンズは、手振れ補正機構を有する。しかし、手振れ補正のために光軸と直交する方向に移動させるレンズの直径が大きく、手振れ補正機構の作動力を大きく、従って手振れ機構が大型で消費電力も大きいという問題がある。 The zoom lens disclosed in Patent Document 3 has a camera shake correction mechanism. However, there is a problem that the diameter of the lens that is moved in the direction orthogonal to the optical axis for camera shake correction is large, and the operating force of the camera shake correction mechanism is large, so that the camera shake mechanism is large and consumes large power.
（発明の目的）
本発明は、従来のズームレンズの上述した問題点に鑑みてなされたものであって、Ｆ２．８程度と明るく、手振れ補正機構を組み込むことができる、広角域を含む標準画角の明るい手振れ補正ズームレンズを提供することを目的とする。
(Object of invention)
The present invention has been made in view of the above-described problems of the conventional zoom lens, and is bright at about F2.8, and can be incorporated with a camera shake correction mechanism. An object is to provide a zoom lens.
本発明は、
被写体側から、正の第１レンズ群、負の第２レンズ群、正の第３レンズ群、正の第４レンズ群からなり、
広角端から望遠端への変倍時に第１レンズ群と第２レンズ群の間隔が広がり、第２レンズ群と第３レンズ群の間隔が狭まり、第３レンズ群と第４レンズ群の間隔が狭まるように移動し、
前記第３レンズ群は、物体側から順に、正の第３前レンズ群と、負の第３中レンズ群と、正の第３後レンズ群からなり、
手振れ補正を第３中レンズ群を光軸と垂直の方向へ移動させることで行い、下記の条件式（１）を満足する手振れ補正ズームレンズ。
0.7＜(F12W×F12T)/(F34W×F34T)＜1.2 ・・・・（１）
但し F12W： 広角端での第１レンズ群と第２レンズ群の合成焦点距離
F12T： 望遠端での第１レンズ群と第２レンズ群の合成焦点距離
F34W： 広角端での第３レンズ群と第４レンズ群の合成焦点距離
F34T： 望遠端での第３レンズ群と第４レンズ群の合成焦点距離
である。
The present invention
From the subject side, it consists of a positive first lens group, a negative second lens group, a positive third lens group, and a positive fourth lens group,
At the time of zooming from the wide angle end to the telephoto end, the distance between the first lens group and the second lens group increases, the distance between the second lens group and the third lens group decreases, and the distance between the third lens group and the fourth lens group decreases. Move to narrow,
The third lens group includes, in order from the object side, a positive third front lens group, a negative third middle lens group, and a positive third rear lens group.
A camera-shake correction zoom lens that performs camera shake correction by moving the third lens group in a direction perpendicular to the optical axis and satisfies the following conditional expression (1).
0.7 <(F12W × F12T) / (F34W × F34T) <1.2 (1)
F12W: Combined focal length of the first and second lens units at the wide-angle end
F12T: Composite focal length of the first and second lens units at the telephoto end
F34W: Combined focal length of the third and fourth lens units at the wide-angle end
F34T: The combined focal length of the third lens group and the fourth lens group at the telephoto end.
本発明の手振れ補正ズームレンズによれば、Ｆ２．８程度と明るく、広角域を含む標準画角で、手振れ補正機構を組み込むことができる手振れ補正ズームレンズを構成できる。 According to the camera shake correction zoom lens of the present invention, it is possible to configure a camera shake correction zoom lens that is bright as about F2.8 and can incorporate a camera shake correction mechanism with a standard angle of view including a wide angle region.
（本発明の実施態様１）
上述した本発明の手振れ補正ズームレンズおいて、さらに下記の条件式（２）〜（４）を満足することを特徴とする手振れ補正ズームレンズ。
0.5＜｜BX1/F3｜＜0.9 ・・・・（２）
BX1<0 ・・・・（３）
F3>0 ・・・・（４）
但し BX1； 防振群（第３中群）の焦点距離
F3 ； 第３群の焦点距離
(Embodiment 1 of the present invention)
The above-described camera shake correction zoom lens according to the present invention further satisfies the following conditional expressions (2) to (4).
0.5 <| BX1 / F3 | <0.9 (2)
BX1 <0 (3)
F3> 0 (4)
However, BX1; Focal length of anti-vibration group (third middle group)
F3: Focal length of the third group
（本発明の実施態様２）
上述した本発明の手振れ補正ズームレンズおいて、さらに下記の条件式（５）を満足することを特徴とする手振れ補正ズームレンズ。
3.2＜ST_W/Fw＜4 ・・・・（５）
但し ST_W： 広角端で絞りと結像面の距離
FW ： 広角端の全系焦点距離
(Embodiment 2 of the present invention)
The above-described camera shake correction zoom lens according to the present invention further satisfies the following conditional expression (5):
3.2 <ST_W / Fw <4 (5)
ST_W: Distance between aperture and image plane at wide-angle end
FW: Total focal length at the wide-angle end
（本発明の実施態様３）
上述した本発明の手振れ補正ズームレンズおいて、らに下記の条件式（６）を満足することを特徴とする手振れ補正ズームレンズ。
1.0＜F3/F4＜1.8 ・・・・（６）
但し F3： 第3レンズ群の焦点距離
F4： 第4レンズ群の焦点距離
(Embodiment 3 of the present invention)
The above-described camera shake correction zoom lens according to the present invention further satisfies the following conditional expression (6).
1.0 <F3 / F4 <1.8 (6)
F3: Focal length of the third lens group
F4: Focal length of the fourth lens group
（本発明の実施態様４）
上述した本発明の手振れ補正ズームレンズおいて、さらに下記の条件式（７）を満足することを特徴とする手振れ補正ズームレンズ。
0.9 ＜｜BX1/F34T｜＜ 1.3 ・・・・（７）
但し BX1 ： 第３中レンズ群の焦点距離
F34T： 望遠端での第３レンズ群と第４レンズ群の合成焦点距離
(Embodiment 4 of the present invention)
The above described camera shake correction zoom lens of the present invention further satisfies the following conditional expression (7):
0.9 <| BX1 / F34T | <1.3 (7)
BX1: Focal length of the third middle lens group
F34T: Combined focal length of the third and fourth lens units at the telephoto end
（条件式１の作用効果）
条件式（１）の上限を超えると、第１レンズ群と第２レンズ群の合成焦点距離が短くなって、第３レンズ群と第４レンズ群を小型化するためには有利であるが、第１レンズ群と第２レンズの有効径が大きくなり、鏡筒の被写体側部分の小径化が困難となる。
条件式（１）の下限を超えると、鏡筒の被写体側部分の小径化には有利であるが、第３レンズ群と第４レンズ群の有効径が大きくなり、さらに手振れ補正機構の小型化が困難となる。
(Operational effect of conditional expression 1)
If the upper limit of conditional expression (1) is exceeded, the combined focal length of the first lens group and the second lens group becomes short, which is advantageous for downsizing the third lens group and the fourth lens group. The effective diameters of the first lens group and the second lens are increased, and it is difficult to reduce the diameter of the subject side portion of the lens barrel.
Exceeding the lower limit of conditional expression (1) is advantageous for reducing the diameter of the subject side portion of the lens barrel, but the effective diameters of the third lens group and the fourth lens group are increased, and the camera shake correction mechanism is further downsized. It becomes difficult.
（条件式２〜４の作用効果）
手振れ補正のために第３中レンズ群を光軸と垂直の方向へ移動させるが、条件式（２）〜（４）は、第３中レンズ群を正のレンズ群で挟み、手振れ補正のために移動させる第３中レンズ群を小径化するための条件である。従って、条件式（２）〜（４）を外れると、手振れ補正のために移動させる第３中レンが大径化し、手振れ補正機構のために好ましくない。
(Operational effects of conditional expressions 2 to 4)
The third middle lens group is moved in the direction perpendicular to the optical axis for camera shake correction. However, conditional expressions (2) to (4) indicate that the third middle lens group is sandwiched between positive lens groups to correct camera shake. This is a condition for reducing the diameter of the third middle lens group to be moved to. Therefore, if the conditional expressions (2) to (4) are deviated, the third middle len that is moved for camera shake correction becomes large in diameter, which is not preferable for the camera shake correction mechanism.
（条件式５の作用効果）
条件式（５）の上限を超えると、第３レンズ群と第４レンズ群の半径方向のサイズを小さくできるが、絞りと結像面が近付くため、手振れ補正機構の駆動系、絞り駆動系、フォーカス駆動系を納める空間を形成することが困難になる。
条件式（５）の下限を超えると、絞りと結像面の間隔が大きくなり、第３レンズ群と第４レンズ群の有効径が大きくなり、手振れ補正機構が大型化する。
(Operational effect of conditional expression 5)
If the upper limit of conditional expression (5) is exceeded, the size of the third lens group and the fourth lens group in the radial direction can be reduced, but the diaphragm and the imaging surface are close to each other. It becomes difficult to form a space for housing the focus drive system.
When the lower limit of conditional expression (5) is exceeded, the distance between the aperture and the imaging surface increases, the effective diameter of the third lens group and the fourth lens group increases, and the camera shake correction mechanism increases in size.
（条件式６の作用効果）
条件式（６）の上限を超えると、広角端でレンズバック（バックフォーカス）が取り易いが、第４レンズ群の有効径が大きくなる。
条件式（６）の下限を超えると、第４レンズ群の小型化には有利だが、広角端でレンズバック（バックフォーカス）が小さくなる。
(Operational effect of conditional expression 6)
If the upper limit of conditional expression (6) is exceeded, lens back (back focus) can be easily obtained at the wide-angle end, but the effective diameter of the fourth lens group becomes large.
Exceeding the lower limit of conditional expression (6) is advantageous for reducing the size of the fourth lens unit, but the lens back (back focus) is reduced at the wide-angle end.
（条件式７の作用効果）
手振れ補正のために第３中レンズ群を光軸と垂直の方向へ移動させるが、条件式（７）の上限を超えると、第３中レンズ群の屈折力が小さくなり、手振れ補正のために移動させる第３中レンズ群を小径化できない。
条件式（７）の下限を超えると、手振れ補正のために移動させる第３中レンズ群を小径化できるが、第３中レンズ群を手振れ補正のために光軸直交方向へ移動させたときの収差補正が困難になる。
(Operational effect of conditional expression 7)
The third middle lens group is moved in the direction perpendicular to the optical axis for camera shake correction. However, if the upper limit of conditional expression (7) is exceeded, the refractive power of the third middle lens group becomes smaller, and camera shake correction is performed. The third middle lens group to be moved cannot be reduced in diameter.
If the lower limit of conditional expression (7) is exceeded, the diameter of the third middle lens group that is moved for camera shake correction can be reduced. However, when the third middle lens group is moved in the direction orthogonal to the optical axis for camera shake correction. Aberration correction becomes difficult.
前記球面収差図において、ｄはｄ線、ｆはｆ線、ｃはｃ線を示す。前記非点収差図において、ｓはサジタル、ｍはメリジオナルを示す。横色収差図において、ｆはｆ線、ｃはｃ線を示す。 In the spherical aberration diagram, d represents the d line, f represents the f line, and c represents the c line. In the graph showing astigmatism, s represents sagittal and m represents meridional. In the lateral chromatic aberration diagram, f indicates f-line and c indicates c-line.
（第１実施形態）
本発明の第１実施形態の手振れ補正ズームレンズは、正の第１レンズ群ＬＧ１、負の第２レンズ群ＬＧ２、正の第３レンズ群ＬＧ３、正の第４レンズ群ＬＧ４からなり、各レンズ面NSの曲率半径R（mm）、各レンズ中心厚及びレンズの空気間隔D（mm）、各レンズのｄ線における屈折率Nd及びアッベ数ABVの値を以下に示す。
NS R D Nd ABV
1 287.4507 1.5000 1.92286 20.88
2 119.1356 7.0000 1.77250 49.62
3 963.8287 0.2000
4 64.7537 7.0000 1.72916 54.67
5 158.5256 D( 5)
6 ASPH 1000.0000 0.2000 1.51409 49.72
7 80.0000 1.0000 1.80400 46.57
8 18.1865 7.5702
9 -73.3842 0.8000 1.77250 49.62
10 60.6123 0.1500
11 47.3950 4.2000 1.90366 31.32
12 -423.2752 3.8000
13 ASPH -21.8417 1.0000 1.58313 59.46
14 150.0793 3.0000 1.90366 31.32
15 -47.0962 D(15)
16 STOP INF 1.0000
17 ASPH 36.5643 0.3500 1.51409 49.72
18 35.0000 5.0000 1.48749 70.24
19 -55.5339 4.0000
20 73.3223 4.0000 1.49700 81.55
21 -93.2550 3.0000
22 ASPH -36.4863 0.8000 1.62263 58.16
23 73.6915 2.0000 1.84666 23.78
24 60.4001 1.5000
25 49.2634 6.0000 1.49700 81.55
26 -49.6333 0.8000 1.72825 28.32
27 246.0122 D(27)
28 27.4223 8.0000 1.49700 81.55
29 -101.2715 0.1000
30 102.0516 5.0000 1.54814 45.78
31 -63.6573 0.1000
32 ASPH 328.9319 1.7000 1.82080 42.71
33 ASPH 57.9834 D(33)
34 INF 2.0000 1.51633 64.14
(First embodiment)
The camera shake correction zoom lens according to the first embodiment of the present invention includes a positive first lens group LG1, a negative second lens group LG2, a positive third lens group LG3, and a positive fourth lens group LG4. The values of the radius of curvature R (mm) of the surface NS, the center thickness of each lens and the air spacing D (mm) of each lens, the refractive index Nd of each lens at the d-line, and the Abbe number ABV are shown below.
NS RD Nd ABV
1 287.4507 1.5000 1.92286 20.88
2 119.1356 7.0000 1.77250 49.62
3 963.8287 0.2000
4 64.7537 7.0000 1.72916 54.67
5 158.5256 D (5)
6 ASPH 1000.0000 0.2000 1.51409 49.72
7 80.0000 1.0000 1.80400 46.57
8 18.1865 7.5702
9 -73.3842 0.8000 1.77250 49.62
10 60.6123 0.1500
11 47.3950 4.2000 1.90366 31.32
12 -423.2752 3.8000
13 ASPH -21.8417 1.0000 1.58313 59.46
14 150.0793 3.0000 1.90366 31.32
15 -47.0962 D (15)
16 STOP INF 1.0000
17 ASPH 36.5643 0.3500 1.51409 49.72
18 35.0000 5.0000 1.48749 70.24
19 -55.5339 4.0000
20 73.3223 4.0000 1.49700 81.55
21 -93.2550 3.0000
22 ASPH -36.4863 0.8000 1.62263 58.16
23 73.6915 2.0000 1.84666 23.78
24 60.4001 1.5000
25 49.2634 6.0000 1.49700 81.55
26 -49.6333 0.8000 1.72825 28.32
27 246.0122 D (27)
28 27.4223 8.0000 1.49700 81.55
29 -101.2715 0.1000
30 102.0516 5.0000 1.54814 45.78
31 -63.6573 0.1000
32 ASPH 328.9319 1.7000 1.82080 42.71
33 ASPH 57.9834 D (33)
34 INF 2.0000 1.51633 64.14
上記数値表において、ASPHは、下記非球面式で示される非球面である。
非球面の式
Aspheric formula
非球面係数の値は、以下のとおりである。
ASPH κ Ａ4 Ａ6 Ａ8 Ａ10
6 1.0000 1.70512E-005 -5.38646E-008 2.28612E-010 -5.65148E-013
13 1.0768 -4.39419E-006 5.89726E-008 -4.31684E-010 8.79568E-013
17 0.8347 -4.74729E-006 -6.31485E-009 -6.82357E-012 1.91883E-013
22 1.0000 8.72905E-006 -2.71141E-008 2.96450E-010 -1.30281E-012
32 1.0000 -1.12207E-005 -1.71815E-008 5.59223E-011 -1.08265E-013
33 1.0000 8.51859E-006 -2.48782E-010 1.21200E-010 -1.26208E-013
The value of the aspheric coefficient is as follows.
ASPH κ A 4 A 6 A 8 A 10
6 1.0000 1.70512E-005 -5.38646E-008 2.28612E-010 -5.65148E-013
13 1.0768 -4.39419E-006 5.89726E-008 -4.31684E-010 8.79568E-013
17 0.8347 -4.74729E-006 -6.31485E-009 -6.82357E-012 1.91883E-013
22 1.0000 8.72905E-006 -2.71141E-008 2.96450E-010 -1.30281E-012
32 1.0000 -1.12207E-005 -1.71815E-008 5.59223E-011 -1.08265E-013
33 1.0000 8.51859E-006 -2.48782E-010 1.21200E-010 -1.26208E-013
ASPH Ａ12
6 6.22424E-016
13 4.77335E-016
17 -4.11272E-016
22 1.85418E-015
32 -1.49218E-016
33 -2.75597E-016
ASPH A 12
6 6.22424E-016
13 4.77335E-016
17 -4.11272E-016
22 1.85418E-015
32 -1.49218E-016
33 -2.75597E-016
ズーム作動の各焦点距離 F（ｍｍ）におけるレンズ間隔の変化は、以下の通りである。
F 24.5008 37.3628 69.0533
D( 5) 2.0361 18.0000 42.4804
D(15) 19.0515 10.0047 1.1691
D(27) 5.1612 2.6000 0.9308
D(33) 39.3200 47.0950 56.7130
The change in the lens interval at each focal length F (mm) of the zoom operation is as follows.
F 24.5008 37.3628 69.0533
D (5) 2.0361 18.0000 42.4804
D (15) 19.0515 10.0047 1.1691
D (27) 5.1612 2.6000 0.9308
D (33) 39.3200 47.0950 56.7130
条件式の値は、以下の通りである。
条件式（１） (F12W×F12T)/(F34W×F34T)＝1.104
条件式（２） ｜BX1/F3｜＝0.524
条件式（３） BX1＝-35.277
条件式（４） F3＝67.342
条件式（５） ST_W/Fw＝3.670
条件式（６） F3/F4＝1.713
条件式（７） ｜BX1/F34T｜＝1.005
The value of the conditional expression is as follows.
Conditional expression (1) (F12W × F12T) / (F34W × F34T) = 1.104
Conditional expression (2) | BX1 / F3 |
Conditional expression (3) BX1 = -35.277
Conditional expression (4) F3 = 67.342
Conditional expression (5) ST_W / Fw = 3.670
Conditional expression (6) F3 / F4 = 1.713
Conditional expression (7) | BX1 / F34T |
（第２実施形態）
本発明の第２実施形態の手振れ補正ズームレンズは、正の第１レンズ群ＬＧ１、負の第２レンズ群ＬＧ２、正の第３レンズ群ＬＧ３、正の第４レンズ群ＬＧ４からなり、各レンズ面NSの曲率半径R（mm）、各レンズ中心厚及びレンズの空気間隔D（mm）、各レンズのｄ線における屈折率Nd及びアッベ数ABVの値を以下に示す。
NS R D Nd ABV
1 223.1651 1.5000 1.92286 20.88
2 100.2046 7.0000 1.77250 49.62
3 339.8399 0.2000
4 56.7549 8.0000 1.72916 54.67
5 165.9540 D( 5)
6 ASPH 1000.0000 0.2000 1.51409 49.72
7 150.0000 1.0000 1.80400 46.57
8 17.9357 7.5702
9 942.9752 0.8000 1.77250 49.62
10 31.7530 0.1500
11 28.9203 4.2000 1.90366 31.32
12 113.5656 3.8000
13 ASPH -22.4782 1.0000 1.58313 59.46
14 58.9885 3.0000 1.90366 31.32
15 -69.1412 D(15)
16 STOP INF 1.0000
17 ASPH 32.8511 0.3500 1.51409 49.72
18 35.0000 5.0000 1.48749 70.24
19 -37.5800 3.0000
20 -133.2637 4.0000 1.49700 81.55
21 -42.0453 3.0000
22 ASPH -48.2790 0.8000 1.62263 58.16
23 70.5105 2.0000 1.84666 23.78
24 61.6089 1.5000
25 45.9605 6.0000 1.49700 81.55
26 -40.0659 0.8000 1.72825 28.32
27 231.4397 D(27)
28 36.3952 6.0000 1.49700 81.55
29 -103.3691 0.1000
30 70.3078 5.0000 1.71300 53.94
31 66.4761 2.0000
32 ASPH -493.0896 1.7000 1.82080 42.71
33 ASPH 406.6728 2.0000
34 -249.2405 4.0000 1.74330 49.22
35 -62.1510 D(35)
36 INF 2.0000 1.51633 64.14
(Second Embodiment)
The camera shake correction zoom lens according to the second embodiment of the present invention includes a positive first lens group LG1, a negative second lens group LG2, a positive third lens group LG3, and a positive fourth lens group LG4. The values of the radius of curvature R (mm) of the surface NS, the center thickness of each lens and the air spacing D (mm) of each lens, the refractive index Nd of each lens at the d-line, and the Abbe number ABV are shown below.
NS RD Nd ABV
1 223.1651 1.5000 1.92286 20.88
2 100.2046 7.0000 1.77250 49.62
3 339.8399 0.2000
4 56.7549 8.0000 1.72916 54.67
5 165.9540 D (5)
6 ASPH 1000.0000 0.2000 1.51409 49.72
7 150.0000 1.0000 1.80400 46.57
8 17.9357 7.5702
9 942.9752 0.8000 1.77250 49.62
10 31.7530 0.1500
11 28.9203 4.2000 1.90366 31.32
12 113.5656 3.8000
13 ASPH -22.4782 1.0000 1.58313 59.46
14 58.9885 3.0000 1.90366 31.32
15 -69.1412 D (15)
16 STOP INF 1.0000
17 ASPH 32.8511 0.3500 1.51409 49.72
18 35.0000 5.0000 1.48749 70.24
19 -37.5800 3.0000
20 -133.2637 4.0000 1.49700 81.55
21 -42.0453 3.0000
22 ASPH -48.2790 0.8000 1.62263 58.16
23 70.5105 2.0000 1.84666 23.78
24 61.6089 1.5000
25 45.9605 6.0000 1.49700 81.55
26 -40.0659 0.8000 1.72825 28.32
27 231.4397 D (27)
28 36.3952 6.0000 1.49700 81.55
29 -103.3691 0.1000
30 70.3078 5.0000 1.71300 53.94
31 66.4761 2.0000
32 ASPH -493.0896 1.7000 1.82080 42.71
33 ASPH 406.6728 2.0000
34 -249.2405 4.0000 1.74330 49.22
35 -62.1510 D (35)
36 INF 2.0000 1.51633 64.14
非球面係数の値は、以下のとおりである。
ASPH κ Ａ4 Ａ6 Ａ8 Ａ10
6 1.0000 1.33339E-005 -4.39872E-008 2.15884E-010 -5.49249E-013
13 1.1767 -1.23471E-007 -2.01656E-008 -5.96305E-010 8.93894E-012
17 -0.8625 -8.54206E-006 2.75687E-008 -7.79109E-011 -4.89326E-013
22 1.0000 3.60858E-006 -1.86711E-008 3.22380E-010 -1.15650E-012
32 1.0000 -4.29373E-006 6.09566E-010 5.44054E-011 -1.14750E-013
33 1.0000 7.77635E-006 -1.72392E-009 1.06308E-010 -2.40997E-013
The value of the aspheric coefficient is as follows.
ASPH κ A 4 A 6 A 8 A 10
6 1.0000 1.33339E-005 -4.39872E-008 2.15884E-010 -5.49249E-013
13 1.1767 -1.23471E-007 -2.01656E-008 -5.96305E-010 8.93894E-012
17 -0.8625 -8.54206E-006 2.75687E-008 -7.79109E-011 -4.89326E-013
22 1.0000 3.60858E-006 -1.86711E-008 3.22380E-010 -1.15650E-012
32 1.0000 -4.29373E-006 6.09566E-010 5.44054E-011 -1.14750E-013
33 1.0000 7.77635E-006 -1.72392E-009 1.06308E-010 -2.40997E-013
ASPH Ａ12
6 6.09401E-016
13 -4.76688E-014
17 -5.19705E-015
22 4.62677E-016
32 5.52462E-017
33 1.92308E-016
ASPH A 12
6 6.09401E-016
13 -4.76688E-014
17 -5.19705E-015
22 4.62677E-016
32 5.52462E-017
33 1.92308E-016
ズーム作動の各焦点距離 F（ｍｍ）におけるレンズ間隔の変化は、以下の通りである。
F 24.7010 38.9697 68.9013
D( 5) 3.9327 18.0000 35.0000
D(15) 19.8795 10.0047 1.1691
D(27) 4.9258 2.6000 1.8350
D(35) 33.0000 42.2290 54.0530
The change in the lens interval at each focal length F (mm) of the zoom operation is as follows.
F 24.7010 38.9697 68.9013
D (5) 3.9327 18.0000 35.0000
D (15) 19.8795 10.0047 1.1691
D (27) 4.9258 2.6000 1.8350
D (35) 33.0000 42.2290 54.0530
条件式の値は、以下の通りである。
条件式（１） (F12W×F12T)/(F34W×F34T)＝0.987
条件式（２） ｜BX1/F3｜＝0.828
条件式（３） BX1＝-42.242
条件式（４） F3＝51.032
条件式（５） ST_W/Fw＝3.570
条件式（６） F3/F4＝1.130
条件式（７） ｜BX1/F34T｜＝1.212
The value of the conditional expression is as follows.
Conditional expression (1) (F12W × F12T) / (F34W × F34T) = 0.987
Conditional expression (2) | BX1 / F3 | = 0.828
Conditional expression (3) BX1 = -42.242
Conditional expression (4) F3 = 51.032
Conditional expression (5) ST_W / Fw = 3.570
Conditional expression (6) F3 / F4 = 1.130
Conditional expression (7) | BX1 / F34T | = 1.212
（第３実施形態）
本発明の第３実施形態の手振れ補正ズームレンズは、正の第１レンズ群ＬＧ１、負の第２レンズ群ＬＧ２、正の第３レンズ群ＬＧ３、正の第４レンズ群ＬＧ４からなり、各レンズ面NSの曲率半径R（mm）、各レンズ中心厚及びレンズの空気間隔D（mm）、各レンズのｄ線における屈折率Nd及びアッベ数ABVの値を以下に示す。
NS R D Nd ABV
1 225.0268 1.5000 1.92286 20.88
2 99.4457 7.0000 1.77250 49.62
3 346.0720 0.2000
4 55.9284 8.0000 1.72916 54.67
5 162.0901 D( 5)
6 ASPH 1000.0000 0.2000 1.51409 49.72
7 150.0000 1.0000 1.80400 46.57
8 18.0777 7.5702
9 510.3727 0.8000 1.77250 49.62
10 27.7062 4.2000 1.90366 31.32
11 121.4131 3.8000
12 ASPH -22.0943 1.0000 1.58313 59.46
13 54.7665 3.0000 1.90366 31.32
14 -68.5400 D(14)
15 STOP INF 1.0000
16 ASPH 32.7486 0.3500 1.51409 49.72
17 35.0000 5.0000 1.48749 70.24
18 -37.6072 3.0000
19 -123.3617 4.0000 1.49700 81.55
20 -40.9128 3.0000
21 ASPH -48.4806 0.8000 1.62263 58.16
22 70.6648 2.0000 1.84666 23.78
23 61.6827 1.5000
24 45.8636 6.0000 1.49700 81.55
25 -40.1696 0.8000 1.72825 28.32
26 233.5844 D(26)
27 36.3963 6.0000 1.49700 81.55
28 -102.8223 0.1000
29 70.1580 5.0000 1.71300 53.94
30 66.7691 2.0000
31 ASPH -423.0056 1.7000 1.82080 42.71
32 ASPH 476.0939 2.0000
33 -320.8170 4.0000 1.74330 49.22
34 -64.9235 D(34)
35 INF 2.0000 1.51633 64.14
(Third embodiment)
The camera shake correction zoom lens according to the third embodiment of the present invention includes a positive first lens group LG1, a negative second lens group LG2, a positive third lens group LG3, and a positive fourth lens group LG4. The values of the radius of curvature R (mm) of the surface NS, the center thickness of each lens and the air spacing D (mm) of each lens, the refractive index Nd of each lens at the d-line, and the Abbe number ABV are shown below.
NS RD Nd ABV
1 225.0268 1.5000 1.92286 20.88
2 99.4457 7.0000 1.77250 49.62
3 346.0720 0.2000
4 55.9284 8.0000 1.72916 54.67
5 162.0901 D (5)
6 ASPH 1000.0000 0.2000 1.51409 49.72
7 150.0000 1.0000 1.80400 46.57
8 18.0777 7.5702
9 510.3727 0.8000 1.77250 49.62
10 27.7062 4.2000 1.90366 31.32
11 121.4131 3.8000
12 ASPH -22.0943 1.0000 1.58313 59.46
13 54.7665 3.0000 1.90366 31.32
14 -68.5400 D (14)
15 STOP INF 1.0000
16 ASPH 32.7486 0.3500 1.51409 49.72
17 35.0000 5.0000 1.48749 70.24
18 -37.6072 3.0000
19 -123.3617 4.0000 1.49700 81.55
20 -40.9128 3.0000
21 ASPH -48.4806 0.8000 1.62263 58.16
22 70.6648 2.0000 1.84666 23.78
23 61.6827 1.5000
24 45.8636 6.0000 1.49700 81.55
25 -40.1696 0.8000 1.72825 28.32
26 233.5844 D (26)
27 36.3963 6.0000 1.49700 81.55
28 -102.8223 0.1000
29 70.1580 5.0000 1.71300 53.94
30 66.7691 2.0000
31 ASPH -423.0056 1.7000 1.82080 42.71
32 ASPH 476.0939 2.0000
33 -320.8170 4.0000 1.74330 49.22
34 -64.9235 D (34)
35 INF 2.0000 1.51633 64.14
非球面係数の値は、以下のとおりである。
ASPH κ Ａ4 Ａ6 Ａ8 Ａ10
6 1.0000 1.28351E-005 -4.49291E-008 2.14600E-010 -5.50852E-013
12 1.1025 7.92379E-007 -1.71997E-008 -6.00310E-010 8.90481E-012
16 -0.8879 -8.63391E-006 2.69462E-008 -9.01939E-011 -5.13682E-013
21 1.0000 3.75402E-006 -1.74418E-008 3.20941E-010 -5.00000E-013
31 1.0000 -4.29111E-006 5.46940E-010 5.44506E-011 -1.50000E-013
32 1.0000 7.77216E-006 -1.72772E-009 1.05976E-010 -2.43316E-013
The value of the aspheric coefficient is as follows.
ASPH κ A 4 A 6 A 8 A 10
6 1.0000 1.28351E-005 -4.49291E-008 2.14600E-010 -5.50852E-013
12 1.1025 7.92379E-007 -1.71997E-008 -6.00310E-010 8.90481E-012
16 -0.8879 -8.63391E-006 2.69462E-008 -9.01939E-011 -5.13682E-013
21 1.0000 3.75402E-006 -1.74418E-008 3.20941E-010 -5.00000E-013
31 1.0000 -4.29111E-006 5.46940E-010 5.44506E-011 -1.50000E-013
32 1.0000 7.77216E-006 -1.72772E-009 1.05976E-010 -2.43316E-013
非球面係数の値は、以下のとおりである。
ASPH Ａ12
6 6.10862E-016
12 -4.68955E-014
16 -5.27721E-015
21 1.81374E-015
31 5.17611E-017
32 1.87768E-016
The value of the aspheric coefficient is as follows.
ASPH A 12
6 6.10862E-016
12 -4.68955E-014
16 -5.27721E-015
21 1.81374E-015
31 5.17611E-017
32 1.87768E-016
ズーム作動の各焦点距離 F（ｍｍ）におけるレンズ間隔の変化は、以下の通りである。
F 23.8334 37.2362 65.5157
D( 5) 4.0884 18.0000 35.0000
D(14) 20.8266 11.1313 2.3926
D(26) 5.1400 2.6000 1.6949
D(34) 32.0120 40.7710 51.4620
The change in the lens interval at each focal length F (mm) of the zoom operation is as follows.
F 23.8334 37.2362 65.5157
D (5) 4.0884 18.0000 35.0000
D (14) 20.8266 11.1313 2.3926
D (26) 5.1400 2.6000 1.6949
D (34) 32.0120 40.7710 51.4620
条件式の値は、以下の通りである。
条件式（１） (F12W×F12T)/(F34W×F34T)＝0.975
条件式（２） ｜BX1/F3｜＝0.827
条件式（３） BX1＝-42.147
条件式（４） F3＝50.988
条件式（５） ST_W/Fw＝3.605
条件式（６） F3/F4＝1.159
条件式（７） ｜BX1/F34T｜＝1.221
The value of the conditional expression is as follows.
Conditional expression (1) (F12W × F12T) / (F34W × F34T) = 0.975
Conditional expression (2) | BX1 / F3 | = 0.827
Conditional expression (3) BX1 = -42.147
Conditional expression (4) F3 = 50.988
Conditional expression (5) ST_W / Fw = 3.605
Conditional expression (6) F3 / F4 = 1.159
Conditional expression (7) ｜ BX1 / F34T ｜ = 1.221
S 絞り
GL１ 第１レンズ群
GL２ 第２レンズ群
GL３ 第３レンズ群
GL４ 第４レンズ群
１ 第１面
２ 第２面
３ 第３面
４ 第４面
５ 第５面
６ 第６面
７ 第７面
８ 第８面
９ 第９面
１０ 第１０面
１１ 第１１面
１２ 第１２面
１３ 第１３面
１４ 第１４面
１５ 第１５面
１６ 第１６面
１７ 第１７面
１８ 第１８面
１９ 第１９面
２０ 第２０面
２１ 第２１面
２２ 第２２面
２３ 第２３面
２４ 第２４面
２５ 第２５面
２５ 第２５面
２６ 第２６面
２７ 第２７面
２８ 第２８面
２９ 第２９面
３０ 第３０面
３１ 第３１面
３２ 第３２面
３３ 第３３面
３４ 第３４面
３５ 第３５面
S Aperture
GL1 first lens group
GL2 second lens group
GL3 Third lens group
GL4 4th lens group 1 1st surface 2 2nd surface 3 3rd surface 4
Claims (3)
広角端から望遠端への変倍時に第１レンズ群と第２レンズ群の間隔が広がり、第２レンズ群と第３レンズ群の間隔が狭まり、第３レンズ群と第４レンズ群の間隔が狭まるように移動し、
前記第３レンズ群は、物体側から順に、正の第３前レンズ群と、負の第３中レンズ群と、正の第３後レンズ群からなり、
手振れ補正を第３中レンズ群を光軸と垂直の方向へ移動させることで行い、下記の条件式（１）を満足し
0.7＜(F12W×F12T)/(F34W×F34T)＜1.2 ・・・・（１）
但し F12W： 広角端での第１レンズ群と第２レンズ群の合成焦点距離
F12T： 望遠端での第１レンズ群と第２レンズ群の合成焦点距離
F34T： 望遠端での第３レンズ群と第４レンズ群の合成焦点距離
また下記の条件式（２）〜（４）を満足し
0.5＜｜BX1/F3｜＜0.9 ・・・・（２）
BX1<0 ・・・・（３）
F3>0 ・・・・（４）
但し BX1； 防振群（第３中群）の焦点距離
F3 ； 第３群の焦点距離
さらに下記の条件式（５）を満足する
3.2＜ST_W/Fw＜4 ・・・・（５）
但し ST_W： 広角端で絞りと結像面の距離
FW ： 広角端の全系焦点距離
ことを特徴とする手振れ補正ズームレンズ。 From the subject side, it consists of a positive first lens group, a negative second lens group, a positive third lens group, and a positive fourth lens group,
At the time of zooming from the wide angle end to the telephoto end, the distance between the first lens group and the second lens group increases, the distance between the second lens group and the third lens group decreases, and the distance between the third lens group and the fourth lens group decreases. Move to narrow,
The third lens group includes, in order from the object side, a positive third front lens group, a negative third middle lens group, and a positive third rear lens group.
Image stabilization is performed by moving the third middle lens group in the direction perpendicular to the optical axis, and satisfies the following conditional expression (1)
0.7 <(F12W × F12T) / (F34W × F34T) <1.2 (1)
F12W: Combined focal length of the first and second lens units at the wide-angle end
F12T: Composite focal length of the first and second lens units at the telephoto end
F 34 T: Combined focal length of the third and fourth lens units at the telephoto end
Also, the following conditional expressions (2) to (4) are satisfied
0.5 <| BX1 / F3 | <0.9 (2)
BX1 <0 (3)
F3> 0 (4)
However, BX1; Focal length of anti-vibration group (third middle group)
F3: Focal length of the third group
Furthermore, the following conditional expression (5) is satisfied
3.2 <ST_W / Fw <4 (5)
ST_W: Distance between aperture and image plane at wide-angle end
FW: An image stabilization zoom lens characterized by the total focal length at the wide-angle end .
1.0＜F3/F4＜1.8 ・・・・（６）
但し F3： 第3レンズ群の焦点距離。
F4： 第4レンズ群の焦点距離 The camera shake correction zoom lens according to claim 1, further satisfying the following conditional expression (6):
1.0 <F3 / F4 <1.8 (6)
F3: Focal length of the third lens group.
F4: Focal length of the fourth lens group
0.9 ＜｜BX1/F34T｜＜ 1.3 ・・・・（７）
但し BX1 ： 第３中レンズ群の焦点距離。
F34T： 望遠端での第３レンズ群と第４レンズ群の合成焦点距離 The camera shake correction zoom lens according to claim 2, further satisfying the following conditional expression (7):
0.9 <| BX1 / F34T | <1.3 (7)
BX1: The focal length of the third middle lens group.
F34T: Combined focal length of the third and fourth lens units at the telephoto end
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| JP2011184438A JP5722730B2 (en) | 2011-08-26 | 2011-08-26 | Image stabilization zoom lens |
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| JP2011184438A JP5722730B2 (en) | 2011-08-26 | 2011-08-26 | Image stabilization zoom lens |
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| JP5722730B2 true JP5722730B2 (en) | 2015-05-27 |
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| JP2005148437A (en) * | 2003-11-17 | 2005-06-09 | Fujinon Corp | Variable power optical system |
| JP4949897B2 (en) * | 2007-03-09 | 2012-06-13 | 富士フイルム株式会社 | Zoom lens with image stabilization function and imaging device |
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