JP2010249958A - Wide-angle zoom lens - Google Patents
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- JP2010249958A JP2010249958A JP2009097399A JP2009097399A JP2010249958A JP 2010249958 A JP2010249958 A JP 2010249958A JP 2009097399 A JP2009097399 A JP 2009097399A JP 2009097399 A JP2009097399 A JP 2009097399A JP 2010249958 A JP2010249958 A JP 2010249958A
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Abstract
Description
本発明は、広角ズームレンズ、さらに詳しくは、画角105°、ズーム比2.2倍を超え、長いバックフォーカスを持つ一眼レフデジタルカメラ用の広角ズームレンズに関する。 The present invention relates to a wide-angle zoom lens, and more particularly to a wide-angle zoom lens for a single-lens reflex digital camera having an angle of view of 105 °, a zoom ratio exceeding 2.2 times, and a long back focus.
従来の一眼レフレックスカメラ用超広角ズームレンズとしては、物体側から像側へ順に、負の屈折力の第1レンズ群、正の屈折力の第2レンズ群、負の屈折力の第3レンズ群、正の屈折力の第4レンズ群を有し、広角端より望遠端へのズーミングに際し、前記第1レンズ群と第2レンズ群の間隔が減少し、前記第2レンズ群と第3レンズ群の間隔が増大し、前記第3レンズ群と第4レンズ群の間隔が減少するズームレンズであって、広角端におけるバックフォーカスをbfw、広角端における全系の焦点距離をfw、第2レンズ群と第4レンズ群の焦点距離を各々f2,f4とするとき、
2.9<bfw/fw<5.0
3.1<f4/fw<4.5
0.1<fw/f2<0.42
なる条件を満足することを特徴とするズームレンズが提案されている(例えば、特許文献1参照)。
As a conventional super wide-angle zoom lens for a single-lens reflex camera, in order from the object side to the image side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens having a negative refractive power And a fourth lens group having a positive refractive power, and during the zooming from the wide-angle end to the telephoto end, the distance between the first lens group and the second lens group decreases, and the second lens group and the third lens A zoom lens in which the distance between the groups is increased and the distance between the third lens group and the fourth lens group is decreased, wherein the back focus at the wide angle end is bfw, the focal length of the entire system at the wide angle end is fw, and the second lens When the focal lengths of the lens group and the fourth lens group are f2 and f4, respectively.
2.9 <bfw / fw <5.0
3.1 <f4 / fw <4.5
0.1 <fw / f2 <0.42
There has been proposed a zoom lens characterized by satisfying the following conditions (for example, see Patent Document 1).
これらの従来の広角ズームレンズは、負、正、負、正の屈折力を持つレンズ群からなる4群ズームレンズタイプである。特許文献1の従来の広角ズームレンズにおいては、広角端の画角が105°程度があり、前枠の有効径が小さく抑えることと長いバックフォーカスの利点を有しているが、しかしながら、2.2倍のズーム比実現し、広角端焦点距離の3.7倍以上のバックフォーカスの要望を満たすことが困難である。
These conventional wide-angle zoom lenses are a four-group zoom lens type composed of lens groups having negative, positive, negative, and positive refractive powers. In the conventional wide-angle zoom lens of
本発明は従来の広角ズームレンズの上述した問題点に鑑みなされたものである。本発明は、広角端の画角は105°を超えることを確保したズームレンズにおいて、2倍以上のズーム比を実現し、広角端の焦点距離の3.7倍以上のバックフォーカスを有する広角レンズを提供することを目的とする。 The present invention has been made in view of the above-described problems of the conventional wide-angle zoom lens. The present invention achieves a zoom ratio of 2 times or more and a wide angle lens having a back focus of 3.7 times or more of the focal length of the wide angle end in a zoom lens that ensures that the angle of view at the wide angle end exceeds 105 °. The purpose is to provide.
第1発明は、
物体から順に、負の屈折力の第1レンズ群、正の屈折力の第2レンズ群、負の屈折力の第3レンズ群、正の屈折力の第4レンズ群を有し、各レンズ群を移動させて変倍を行い、群間の間隔と各群の焦点距離と群の合成群の焦点距離が以下の条件式を満たす広角ズームレンズ。
条件式(1)1.03 ≦ BFw/(Fnow*Fw) ≦ 1.2
但し、
BFw :バックフォーカス
Fnow:広角端でのFナンバー
Fw :広角端での光学全系の焦点距離
である。
The first invention is
In order from the object, each lens group includes a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a fourth lens group having a positive refractive power. A wide-angle zoom lens that performs zooming by moving the lens, and the distance between groups, the focal length of each group, and the focal length of the combined group of the groups satisfy the following conditional expression.
Conditional expression (1) 1.03 ≤ BFw / (Fnow * Fw) ≤ 1.2
However,
BFw: Back focus
Fnow: F number at the wide-angle end
Fw: The focal length of the entire optical system at the wide-angle end.
第2発明は、
物体から順に、負の屈折力の第1レンズ群、正の屈折力の第2レンズ群、負の屈折力の第3レンズ群、正の屈折力の第4レンズ群を有し、各レンズ群を移動させて変倍を行い、群間の間隔と各群の焦点距離と群の合成群の焦点距離が以下の条件式を満たす広角ズームレンズ。
条件式(2)F23w/Fw ≧ 12
但し、
F23w:広角端での第2レンズ群と第3レンズ群の合成焦点距離
Fw :広角端での光学全系の焦点距離
である。
The second invention is
In order from the object, each lens group includes a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a fourth lens group having a positive refractive power. A wide-angle zoom lens that performs zooming by moving the lens, and the distance between groups, the focal length of each group, and the focal length of the combined group of the groups satisfy the following conditional expression.
Conditional expression (2) F23w / Fw ≧ 12
However,
F23w: Combined focal length of the second and third lens units at the wide-angle end
Fw: The focal length of the entire optical system at the wide-angle end.
第3発明は、
物体から順に、負の屈折力の第1レンズ群、正の屈折力の第2レンズ群、負の屈折力の第3レンズ群、正の屈折力の第4レンズ群を有し、各レンズ群を移動させて変倍を行い、群間の間隔と各群の焦点距離と群の合成群の焦点距離が以下の条件式を満たす広角ズームレンズ。
条件式(3)F234w/(D12w) ≧ 1.3
但し、
F234w:広角端での第2、3、4群の合成焦点距離
D12w :無限遠での広角端の第1レンズ群と第2レンズ群の間隔
である。
The third invention is
In order from the object, each lens group includes a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a fourth lens group having a positive refractive power. A wide-angle zoom lens that performs zooming by moving the lens, and the distance between groups, the focal length of each group, and the focal length of the combined group of the groups satisfy the following conditional expression.
Conditional expression (3) F234w / (D12w) ≧ 1.3
However,
F234w: Composite focal length of the 2nd, 3rd and 4th groups at the wide-angle end
D12w: Distance between the first lens unit and the second lens unit at the wide angle end at infinity.
本発明の実施態様は、以下のとおりである。
第1発明において、さらに、条件式(2)を満たすことを特徴とする。
Embodiments of the present invention are as follows.
The first invention is further characterized by satisfying conditional expression (2).
第1発明及び第2発明において、さらに、条件式(3)を満たすことを特徴とする。 In the first invention and the second invention, the condition expression (3) is further satisfied.
さらに、条件式(4)F234w/(D12w*Fw) ≧ 0.13
を満たすことを特徴とする。
但し、
F234w:広角端での第2、3、4群の合成焦点距離
D12w :無限遠での広角端の第1レンズ群と第2レンズ群の間隔
Fw :広角端での光学全系の焦点距離
Furthermore, conditional expression (4) F234w / (D12w * Fw) ≧ 0.13
It is characterized by satisfying.
However,
F234w: Composite focal length of the 2nd, 3rd and 4th groups at the wide-angle end
D12w: Distance between the first and second lens units at the wide-angle end at infinity
Fw: Focal length of the entire optical system at the wide-angle end
さらに、条件式(5) |F23w/F23t| ≧ 2.0
を満たすことを特徴とする。
但し、
F23w:広角端で第2レンズ群と第3レンズ群の合成焦点距離
F23t:望遠端で第2レンズ群と第3レンズ群の合成焦点距離
Furthermore, conditional expression (5) | F23w / F23t | ≧ 2.0
It is characterized by satisfying.
However,
F23w: Combined focal length of the second and third lens units at the wide-angle end
F23t: Combined focal length of the second and third lens units at the telephoto end
負の屈折力の第1レンズ群は、負の屈折力の第1レンズ群の前群レンズ群及び負の屈折力の第1レンズ群の後群レンズ群からなり、無限遠物体から近距離へのフォーカシングを前記第1レンズ群の後群レンズ群を物体側へ移動させることを特徴とする。 The first lens unit having a negative refractive power is composed of a front lens unit of the first lens unit having a negative refractive power and a rear lens unit of the first lens unit having a negative refractive power. In this focusing, the rear lens unit of the first lens unit is moved to the object side.
(発明の条件式の説明)
条件式(1)は、バックフォーカスと広角端でのFナンバーの関係を規定する。条件式(1)の上限を超えると、球面収差、非点収差等が発生する。条件式(1)の下限を超えると、バックフォーカス、画角、明るさ等のバランスをとることが困難になる。
条件式(1)を、1.03 ≦ BFw/(Fnow*Fw) ≦ 1.1
とすると、本発明の効果をより確実のものとすることができる。
(Explanation of conditional expressions of the invention)
Conditional expression (1) defines the relationship between the back focus and the F number at the wide angle end. If the upper limit of conditional expression (1) is exceeded, spherical aberration, astigmatism, etc. occur. When the lower limit of conditional expression (1) is exceeded, it becomes difficult to balance back focus, angle of view, brightness, and the like.
Conditional expression (1) is changed to 1.03 ≤ BFw / (Fnow * Fw) ≤ 1.1
Then, the effect of the present invention can be made more reliable.
条件式(2)は、広角端で第2群と第3群の合成群の焦点距離と広角端の全系焦点距離の比率を規定する。条件式(2)の下限を超えると、第2群と第3群の合成群のパワー(パワー=焦点距離の逆数)が強くなる。その結果、広角端で長いバックフォーカスを実現することが困難となる。条件式(2)の下限を超えると、さらに、球面収差、非点収差等が発生する。
条件式(2)を、13 ≦ F23w/Fw ≦ 15
とすると、本発明の効果をより確実のものとすることができる。
Conditional expression (2) defines the ratio between the focal length of the combined group of the second group and the third group at the wide angle end and the total focal length at the wide angle end. When the lower limit of conditional expression (2) is exceeded, the power of the combined group of the second group and the third group (power = reciprocal of focal length) increases. As a result, it becomes difficult to realize a long back focus at the wide-angle end. If the lower limit of conditional expression (2) is exceeded, further spherical aberration, astigmatism, etc. occur.
Conditional expression (2) is expressed as 13 ≤ F23w / Fw ≤ 15
Then, the effect of the present invention can be made more reliable.
条件式(3)は、広角端での第2、3、4群の合成焦点距離と広角端での第1レンズ群と第2レンズ群の間隔の関係を規定する。条件式(2)の下限を超えると、球面収差、コマ収差等が発生する。
条件式(3)を、 1.3 ≦ F234w/(D12w) ≦ 1.5
とすると、本発明の効果をより確実のものとすることができる。
Conditional expression (3) defines the relationship between the combined focal length of the second, third, and fourth groups at the wide-angle end and the distance between the first lens group and the second lens group at the wide-angle end. If the lower limit of conditional expression (2) is exceeded, spherical aberration, coma, etc. will occur.
Conditional expression (3) is expressed as 1.3 ≤ F234w / (D12w) ≤ 1.5
Then, the effect of the present invention can be made more reliable.
条件式(4)は、広角端での第2、3、4群の合成群の焦点距離と第1群と第2群の間隔及び広角端の全系の焦点距離の関係式である。条件式(4)の下限を超えると、広角端の焦点距離の3.7倍以上の長いバックフォーカスを実現することが困難となる。条件式(4)の下限を超えると、さらに、球面収差、コマ収差等が発生する。
条件式(4)を、 0.13 ≦ F234w/(D12w*Fw) ≦ 0.15
とすると、本発明の効果をより確実のものとすることができる。
Conditional expression (4) is a relational expression of the focal length of the second, third, and fourth group composites at the wide angle end, the distance between the first group and the second group, and the focal length of the entire system at the wide angle end. If the lower limit of conditional expression (4) is exceeded, it will be difficult to achieve a long back focus that is at least 3.7 times the focal length at the wide-angle end. When the lower limit of conditional expression (4) is exceeded, spherical aberration, coma aberration, and the like further occur.
Conditional expression (4) is expressed as 0.13 ≤ F234w / (D12w * Fw) ≤ 0.15
Then, the effect of the present invention can be made more reliable.
条件式(5)は、広角端でと望遠端での第2群と第3群の合成群の焦点距離の比率を規定した。条件式(5)の下限を超えると、小型化と2.2倍以上のズーム変倍を両立することが困難となる。条件式(5)の下限を超えると、さらに、球面収差、非点収差等が発生する。
条件式(5)を、 2.0 ≦ |F23w/F23t| ≦ 3.0
とすると、本発明の効果をより確実のものとすることができる。
Conditional expression (5) defines the ratio of the focal lengths of the combined groups of the second group and the third group at the wide-angle end and at the telephoto end. If the lower limit of conditional expression (5) is exceeded, it will be difficult to achieve both downsizing and zoom magnification of 2.2 times or more. When the lower limit of conditional expression (5) is exceeded, spherical aberration, astigmatism and the like further occur.
Conditional expression (5) is changed to 2.0 ≦ | F23w / F23t | ≦ 3.0
Then, the effect of the present invention can be made more reliable.
本発明の広角ズームレンズにおいては、広角端の画角は105°を超えることを確保したズームレンズにおいて、2倍以上のズーム比を実現し、広角端の焦点距離の3.7倍以上のバックフォーカスを有する広角レンズを構成することができる。 In the wide-angle zoom lens of the present invention, a zoom lens that ensures that the angle of view at the wide-angle end exceeds 105 ° achieves a zoom ratio of 2 times or more and a back of 3.7 times or more the focal length at the wide-angle end. A wide-angle lens having a focus can be configured.
以下に、本発明の広角ズームレンズの実施形態及びその収差状況を説明する。
(第1実施形態)
第1実施形態にかかる広角ズームレンズは、図1に示す構成を有する。各レンズ面の曲率半径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の値は、以下のとおりである。
In the following, embodiments of the wide-angle zoom lens of the present invention and aberrations thereof will be described.
(First embodiment)
The wide-angle zoom lens according to the first embodiment has the configuration shown in FIG. The values of the radius of curvature R (mm) of each lens surface, the center thickness of each lens and the air space D (mm) of each lens, the refractive index Nd of each lens d-line and the Abbe number ABV are as follows.
焦点距離:10.29〜15.5952〜23.3915
FNO:3.6〜4.15〜4.6
2ω:111.4〜85.4〜62.6
S R D Nd ABV
1 ASPH 90.9531 3.0000 1.74690 49.22
2 ASPH 13.3000 17.4155
3 -347.3422 1.1000 1.83944 42.72
4 27.7720 0.2500 1.51700 49.96
5 ASPH 32.9778 0.8225
6 20.1105 4.8835 1.70444 30.05
7 45.1356 D7
絞り 0.0000 1.6767
9 -70.4744 2.4522 1.69416 31.16
10 -14.1708 0.8000 1.88815 40.80
11 -37.7808 0.1500
12 33.1737 3.7557 1.59142 61.25
13 -14.2611 0.8000 1.81184 33.27
14 -28.6675 D14
15 -29.8948 0.8000 1.80831 46.50
16 23.7239 2.5836 1.93325 20.88
17 240.6296 D17
18 40.3874 4.8044 1.49845 81.61
19 -35.6422 0.1500
20 49.4590 0.8000 1.91048 31.31
21 17.3129 11.6398 1.49845 81.61
22 -14.5130 0.8000 1.91048 31.31
23 -20.5428 0.2000
24 ASPH -34.8009 0.2000 1.51700 49.96
25 -31.4677 1.3000 1.83930 37.34
26 -38.5550
Focal length: 10.29 ~ 15.5952 ~ 23.3915
FNO: 3.6-4.15-4.6
2ω: 111.4-85.4-62.6
SRD Nd ABV
1 ASPH 90.9531 3.0000 1.74690 49.22
2 ASPH 13.3000 17.4155
3 -347.3422 1.1000 1.83944 42.72
4 27.7720 0.2500 1.51700 49.96
5 ASPH 32.9778 0.8225
6 20.1105 4.8835 1.70444 30.05
7 45.1356 D7
Aperture 0.0000 1.6767
9 -70.4744 2.4522 1.69416 31.16
10 -14.1708 0.8000 1.88815 40.80
11 -37.7808 0.1500
12 33.1737 3.7557 1.59142 61.25
13 -14.2611 0.8000 1.81184 33.27
14 -28.6675 D14
15 -29.8948 0.8000 1.80831 46.50
16 23.7239 2.5836 1.93325 20.88
17 240.6296 D17
18 40.3874 4.8044 1.49845 81.61
19 -35.6422 0.1500
20 49.4590 0.8000 1.91048 31.31
21 17.3129 11.6398 1.49845 81.61
22 -14.5130 0.8000 1.91048 31.31
23 -20.5428 0.2000
24 ASPH -34.8009 0.2000 1.51700 49.96
25 -31.4677 1.3000 1.83930 37.34
26 -38.5550
焦点距離:10.2935 15.5952 23.3915
可変間隔
D7 21.974 11.228 4.641
D14 1.000 7.723 14.519
D17 10.742 5.812 0.900
Focal length: 10.2935 15.5952 23.3915
Variable interval
D7 21.974 11.228 4.641
D14 1.000 7.723 14.519
D17 10.742 5.812 0.900
ASPHは、非球面を示し、以下の式(式1)で示される。
(式1)
z:非球面深さ
y:高さ
R:近軸曲率半径
K、A、B、C、D:非球面係数
ASPH indicates an aspherical surface and is represented by the following equation (Equation 1).
(Formula 1)
z: aspheric depth y: height R: paraxial radius of curvature K, A, B, C, D: aspheric coefficient
非球面係数
面1
K : -21.703831
A :0.137414E-04 B :-.284986E-07 C :0.473022E-10 D :-.418229E-13
E :0.157785E-16
面2
K : -0.864034
A :0.743621E-06 B :0.628016E-07 C :-.187456E-09 D :0.315824E-12
E :0.773230E-15
面5
K : 1.512115
A :0.292118E-04 B :-.127860E-06 C :0.842074E-09 D :-.326732E-11
E :0.634290E-14
面24
K : -0.150085
A :-.101962E-04 B :0.106224E-07 C :0.235188E-10 D :0.177170E-12
K: -21.703831
A: 0.137414E-04 B:-. 284986E-07 C: 0.473022E-10 D:-. 418229E-13
E: 0.157785E-16
Surface 2
K: -0.864034
A: 0.743621E-06 B: 0.628016E-07 C:-. 187456E-09 D: 0.315824E-12
E: 0.773230E-15
K: 1.512115
A: 0.292118E-04 B:-. 127860E-06 C: 0.842074E-09 D:-. 326732E-11
E: 0.634290E-14
Surface 24
K: -0.150085
A:-. 101962E-04 B: 0.106224E-07 C: 0.235188E-10 D: 0.177170E-12
第1実施形態の広角ズームレンズの各レンズの焦点距離は、以下のとおりである。
群の焦点距離
第1群: -15.253
第2群: 32.183
第3群: -38.7101
第4群: 32.558
Gr1a: -21.94
Gr1b: -104.94
The focal length of each lens of the wide-angle zoom lens of the first embodiment is as follows.
Group focal length Group 1: -15.253
Second group: 32.183
Group 3: -38.7101
Group 4: 32.558
Gr1a: -21.94
Gr1b: -104.94
広角端で
第2,3群合成焦点距離: 148.639
第2,3,4群合成焦点距離:31.483
第1,2,3群合成群焦点距離:-23.355
第1,2,3群合成群と4群の主点位置間間隔:83.074
レンズ全長:94.1
望遠端で
第2、3群の合成焦点距離:56.887
2nd and 3rd group focal length at wide angle end: 148.639
2nd, 3rd, 4th group composite focal length: 31.483
1st, 2nd and 3rd group composite focal length: -23.355
The distance between the principal points of the 1st, 2nd, 3rd group and 4th group: 83.074
Total lens length: 94.1
Combined focal length of groups 2 and 3 at telephoto end: 56.887
第1実施形態の広角ズームレンズの第11面の形状は、以下のとおりである。
有効径 法線角度
The shape of the first surface of the wide-angle zoom lens of the first embodiment is as follows.
Effective diameter Normal angle
第1実施形態の広角ズームレンズの条件式の値は、以下のとおりである。
条件式(1) BFw/(Fnow*Fw) =1.05
条件式(2) F23w/Fw=14.44
条件式(3) F234w/(D12w) =1.433
条件式(4) F234w/(D12w*Fw)=0.139
条件式(5) F23w/F23t=2.613
The values of the conditional expressions of the wide angle zoom lens of the first embodiment are as follows.
Conditional expression (1) BFw / (Fnow * Fw) = 1.05
Conditional expression (2) F23w / Fw = 14.44
Conditional expression (3) F234w / (D12w) = 1.433
Conditional expression (4) F234w / (D12w * Fw) = 0.139
Conditional expression (5) F23w / F23t = 2.613
第1実施形態の広角ズームレンズの広角端の球面収差、非点収差、歪曲収差及び倍率色収差を図2を示す。第1実施形態の広角ズームレンズの望遠端の球面収差、非点収差、歪曲収差及び倍率色収差を図3を示す。 FIG. 2 shows spherical aberration, astigmatism, distortion and lateral chromatic aberration at the wide angle end of the wide angle zoom lens according to the first embodiment. FIG. 3 shows spherical aberration, astigmatism, distortion, and lateral chromatic aberration at the telephoto end of the wide-angle zoom lens according to the first embodiment.
(第2実施形態)
第2実施形態の広角ズームレンズは、図4に示す構成を有する。各レンズ面の曲率半径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は、以下のとおりである。
(Second Embodiment)
The wide-angle zoom lens of the second embodiment has the configuration shown in FIG. The radius of curvature R (mm) of each lens surface, the center thickness of each lens and the air space D (mm) of the lens, the refractive index Nd and the Abbe number ABV in the d-line of each lens are as follows.
焦点距離:10.29〜15.60〜23.39
FNO:3.6〜4.15〜4.6
2ω:111.36〜85.71〜62.88
S R D Nd ABV
1 ASPH 98.2835 3.0000 1.74330 49.22
2 ASPH 13.3000 17.0621
3 -375.8017 1.1000 1.83481 42.72
4 26.2992 0.2500 1.51460 49.96
5 ASPH 31.3128 0.8586
6 19.4744 4.2180 1.69895 30.05
7 44.8215 D7
8 0.0000 1.6811
9 -69.6742 2.4945 1.68893 31.16
10 -13.8558 0.8000 1.88300 40.80
11 -37.5514 0.1500
12 33.6029 3.7863 1.58913 61.25
13 -14.1772 0.8000 1.80610 33.27
14 -28.4616 D14
15 -31.0253 0.8000 1.80420 46.50
16 23.9527 2.5703 1.92286 20.88
17 237.9034 D17
18 41.0664 4.5125 1.49700 81.61
19 -35.8367 0.1500
20 49.9837 0.9000 1.90366 31.31
21 17.1665 11.7603 1.49700 81.61
22 -14.5000 1.1000 1.90366 31.31
23 -21.0822 0.2000
24 ASPH -50.4122 0.2000 1.51460 49.96
25 -44.1195 1.8000 1.83400 37.34
26 -53.8351
Focal length: 10.29-15.60-23.39
FNO: 3.6-4.15-4.6
2ω: 111.36 ~ 85.71 ~ 62.88
SRD Nd ABV
1 ASPH 98.2835 3.0000 1.74330 49.22
2 ASPH 13.3000 17.0621
3 -375.8017 1.1000 1.83481 42.72
4 26.2992 0.2500 1.51460 49.96
5 ASPH 31.3128 0.8586
6 19.4744 4.2180 1.69895 30.05
7 44.8215 D7
8 0.0000 1.6811
9 -69.6742 2.4945 1.68893 31.16
10 -13.8558 0.8000 1.88300 40.80
11 -37.5514 0.1500
12 33.6029 3.7863 1.58913 61.25
13 -14.1772 0.8000 1.80610 33.27
14 -28.4616 D14
15 -31.0253 0.8000 1.80420 46.50
16 23.9527 2.5703 1.92286 20.88
17 237.9034 D17
18 41.0664 4.5125 1.49700 81.61
19 -35.8367 0.1500
20 49.9837 0.9000 1.90366 31.31
21 17.1665 11.7603 1.49700 81.61
22 -14.5000 1.1000 1.90366 31.31
23 -21.0822 0.2000
24 ASPH -50.4122 0.2000 1.51460 49.96
25 -44.1195 1.8000 1.83400 37.34
26 -53.8351
焦点距離:10.29 15.60 23.40
可変間隔
D7 22.0922 11.2672 4.7266
D14 0.9588 7.5245 14.2504
D17 10.8553 5.8392 0.800
Focal length: 10.29 15.60 23.40
Variable interval
D7 22.0922 11.2672 4.7266
D14 0.9588 7.5245 14.2504
D17 10.8553 5.8392 0.800
非球面係数
面1
K : -30.868200
A :0.147706E-04 B :-.260370E-07 C :0.377473E-10 D :-.300023E-13
E :0.107463E-16
面2
K : -1.240297
A :0.207897E-04 B :0.298769E-07 C :0.267684E-09 D :-.163367E-11
E :0.372598E-14
面5
K : 2.187192
A :0.313924E-04 B :-.202309E-06 C :0.158321E-08 D :-.733956E-11
E :0.139279E-13
面24
K : -0.780042
A :-.942956E-05 B :0.141825E-07 C :0.244817E-10 D :0.194500E-12
K: -30.868200
A: 0.147706E-04 B:-. 260370E-07 C: 0.377473E-10 D:-. 300023E-13
E: 0.107463E-16
Surface 2
K: -1.240297
A: 0.207897E-04 B: 0.298769E-07 C: 0.267684E-09 D:-. 163367E-11
E: 0.372598E-14
K: 2.187192
A: 0.313924E-04 B:-. 202309E-06 C: 0.158321E-08 D:-. 733956E-11
E: 0.139279E-13
Surface 24
K: -0.780042
A:-. 942956E-05 B: 0.141825E-07 C: 0.244817E-10 D: 0.194500E-12
第2実施形態の広角ズームレンズの各レンズの焦点距離は、以下のとおりである。
群の焦点距離
第1群: -15.085
第2群: 32.5574
第3群: -40.0929
第4群: 33.0051
Gr1a: -21.0097
Gr1b: -102.427
The focal length of each lens of the wide-angle zoom lens of the second embodiment is as follows.
Group focal length Group 1: -15.085
Second group: 32.5574
Group 3: -40.0929
Group 4: 33.0051
Gr1a: -21.0097
Gr1b: -102.427
広角端で
第2,3群合成焦点距離: 140.206
第2,3,4群合成焦点距離:31.626
第1,2,3群合成群焦点距離:-24.033
第1,2,3群合成群と4群の主点位置間間隔:86.032
レンズ全長:94.1
望遠端で
第2、3群の合成焦点距離:57.754
2nd and 3rd group focal length at wide angle end: 140.206
2nd, 3rd, 4th group composite focal length: 31.626
1st, 2nd, 3rd group composite focal length: -24.033
Interval between principal points of the 1st, 2nd, 3rd group and 4th group: 86.032
Total lens length: 94.1
Combined focal length of groups 2 and 3 at the telephoto end: 57.754
第2実施形態の広角ズームレンズの第11面の形状は、以下のとおりである。
有効径 法線角度
The shape of the first surface of the wide-angle zoom lens of the second embodiment is as follows.
Effective diameter Normal angle
第2実施形態の広角ズームレンズの条件式の値は、以下のとおりである。
条件式(1) BFw/(Fnow*Fw) =1.05
条件式(2) F23w/Fw=13.621
条件式(3) F234w/(D12w) =1.432
条件式(4) F234w/(D12w*Fw)=0.139
条件式(5) F23w/F23t=2.428
The values of the conditional expressions of the wide angle zoom lens of the second embodiment are as follows.
Conditional expression (1) BFw / (Fnow * Fw) = 1.05
Conditional expression (2) F23w / Fw = 13.621
Conditional expression (3) F234w / (D12w) = 1.432
Conditional expression (4) F234w / (D12w * Fw) = 0.139
Conditional expression (5) F23w / F23t = 2.428
第2実施形態の広角ズームレンズの広角端の球面収差、非点収差、歪曲収差及び倍率色収差を図5を示す。第2実施形態の広角ズームレンズの望遠端の球面収差、非点収差、歪曲収差及び倍率色収差を図6を示す。 FIG. 5 shows spherical aberration, astigmatism, distortion and lateral chromatic aberration at the wide angle end of the wide angle zoom lens according to the second embodiment. FIG. 6 shows spherical aberration, astigmatism, distortion, and lateral chromatic aberration at the telephoto end of the wide-angle zoom lens according to the second embodiment.
(第3実施形態)
第1実施形態にかかる広角ズームレンズは、図7に示す構成を有する。各レンズ面の曲率半径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の値は、以下のとおりである。
(Third embodiment)
The wide-angle zoom lens according to the first embodiment has the configuration shown in FIG. The values of the radius of curvature R (mm) of each lens surface, the center thickness of each lens and the air space D (mm) of each lens, the refractive index Nd of each lens d-line and the Abbe number ABV are as follows.
焦点距離:10.29〜15.60〜23.39
FNO:3.6〜4.15〜4.6
2ω:111.38〜85.4〜62.63
S R D Nd ABV
1 ASPH 91.2892 3.0000 1.74330 49.22
2 ASPH 13.3000 17.1746
3 -550.1946 1.1000 1.83481 42.72
4 26.8414 0.2500 1.51460 49.96
5 ASPH 31.7796 0.8380
6 19.6685 4.8948 1.69895 30.05
7 43.3886 D7
8 0.0000 1.6759
9 -70.7449 2.4534 1.68893 31.16
10 -14.1775 0.8000 1.88300 40.80
11 -37.9248 0.1500
12 33.1085 3.7574 1.58913 61.25
13 -14.2673 0.7937 1.80610 33.27
14 -28.7457 D14
15 -29.9856 0.8000 1.80420 46.50
16 23.8293 2.5887 1.92286 20.88
17 241.4124 D17
18 40.5319 4.7504 1.49700 81.61
19 -35.4136 0.1500
20 49.8255 0.9000 1.90366 31.31
21 17.3000 11.4746 1.49700 81.61
22 -14.5000 0.9000 1.90366 31.31
23 -20.5448 0.2000
24 ASPH -34.3632 0.2000 1.51460 49.96
25 -31.0708 1.3000 1.83400 37.34
26 -37.8865
Focal length: 10.29-15.60-23.39
FNO: 3.6-4.15-4.6
2ω: 111.38 ~ 85.4 ~ 62.63
SRD Nd ABV
1 ASPH 91.2892 3.0000 1.74330 49.22
2 ASPH 13.3000 17.1746
3 -550.1946 1.1000 1.83481 42.72
4 26.8414 0.2500 1.51460 49.96
5 ASPH 31.7796 0.8380
6 19.6685 4.8948 1.69895 30.05
7 43.3886 D7
8 0.0000 1.6759
9 -70.7449 2.4534 1.68893 31.16
10 -14.1775 0.8000 1.88300 40.80
11 -37.9248 0.1500
12 33.1085 3.7574 1.58913 61.25
13 -14.2673 0.7937 1.80610 33.27
14 -28.7457 D14
15 -29.9856 0.8000 1.80420 46.50
16 23.8293 2.5887 1.92286 20.88
17 241.4124 D17
18 40.5319 4.7504 1.49700 81.61
19 -35.4136 0.1500
20 49.8255 0.9000 1.90366 31.31
21 17.3000 11.4746 1.49700 81.61
22 -14.5000 0.9000 1.90366 31.31
23 -20.5448 0.2000
24 ASPH -34.3632 0.2000 1.51460 49.96
25 -31.0708 1.3000 1.83400 37.34
26 -37.8865
焦点距離:10.29 15.60 23.40
可変間隔
D7 22.252 11.5339 4.8871
D14 1.000 7.8478 14.5915
D17 10.6954 5.7013 0.800
Focal length: 10.29 15.60 23.40
Variable interval
D7 22.252 11.5339 4.8871
D14 1.000 7.8478 14.5915
D17 10.6954 5.7013 0.800
非球面係数
面1
K : -23.358778
A :0.138306E-04 B :-.284728E-07 C :0.473046E-10 D :-.418342E-13
E :0.157340E-16
面2
K : -0.865462
A :0.617175E-06 B :0.624054E-07 C :-.184300E-09 D :0.328276E-12
E :0.773908E-15
面5
K : 1.536049
A :0.293177E-04 B :-.126814E-06 C :0.844851E-09 D :-.324948E-11
E :0.634290E-14
面24
K : -0.133768 KC : 100
A :-.102523E-04 B :0.105589E-07 C :0.225709E-10 D :0.159981E-12
K: -23.358778
A: 0.138306E-04 B:-. 284728E-07 C: 0.473046E-10 D:-. 418342E-13
E: 0.157340E-16
Surface 2
K: -0.865462
A: 0.617175E-06 B: 0.624054E-07 C:-. 184300E-09 D: 0.328276E-12
E: 0.773908E-15
K: 1.536049
A: 0.293177E-04 B:-. 126814E-06 C: 0.844851E-09 D:-. 324948E-11
E: 0.634290E-14
Surface 24
K: -0.133768 KC: 100
A:-. 102523E-04 B: 0.105589E-07 C: 0.225709E-10 D: 0.159981E-12
第3実施形態の広角ズームレンズの各レンズの焦点距離は、以下のとおりである。
群の焦点距離
第1群: -15.297
第2群: 32.268
第3群: -38.818
第4群: 32.560
Gr1a: -21.294
Gr1b: -106.239
The focal length of each lens of the wide-angle zoom lens according to the third embodiment is as follows.
Group focal length Group 1: -15.297
Second group: 32.268
Group 3: -38.818
Group 4: 32.560
Gr1a: -21.294
Gr1b: -106.239
広角端で
第2,3群合成焦点距離: 148.971
第2,3,4群合成焦点距離:31.486
第1,2,3群合成群焦点距離:-23.429
第1,2,3群合成群と4群の主点位置間間隔:83.241
レンズ全長:94.0988
望遠端で
第2、3群の合成焦点距離:56.936
2nd and 3rd group focal length at wide angle end: 148.971
2nd, 3rd and 4th lens groups: 31.486
1st, 2nd, 3rd group composite focal length: -23.429
The distance between the principal points of the 1st, 2nd, 3rd group and 4th group
Total lens length: 94.0988
Combined focal length of groups 2 and 3 at telephoto end: 56.936
第3実施形態の広角ズームレンズの第11面の形状は、以下のとおりである。
有効径 法線角度
The shape of the first surface of the wide-angle zoom lens of the third embodiment is as follows.
Effective diameter Normal angle
第3実施形態の広角ズームレンズの条件式の値は、以下のとおりである。
条件式(1) BFw/(Fnow*Fw) =1.05
条件式(2) F23w/Fw=14.472
条件式(3) F234w/(D12w) =1.415
条件式(4) F234w/(D12w*Fw)=0.137
条件式(5) F23w/F23t=2.616
The values of the conditional expressions of the wide angle zoom lens of the third embodiment are as follows.
Conditional expression (1) BFw / (Fnow * Fw) = 1.05
Conditional expression (2) F23w / Fw = 14.472
Conditional expression (3) F234w / (D12w) = 1.415
Conditional expression (4) F234w / (D12w * Fw) = 0.137
Conditional expression (5) F23w / F23t = 2.616
第3実施形態の広角ズームレンズの広角端の球面収差、非点収差、歪曲収差及び倍率色収差を図8を示す。第1実施形態の広角ズームレンズの望遠端の球面収差、非点収差、歪曲収差及び倍率色収差を図9を示す。 FIG. 8 shows spherical aberration, astigmatism, distortion and lateral chromatic aberration at the wide angle end of the wide angle zoom lens according to the third embodiment. FIG. 9 shows spherical aberration, astigmatism, distortion, and lateral chromatic aberration at the telephoto end of the wide-angle zoom lens according to the first embodiment.
(第4実施形態)
第4実施形態にかかる広角ズームレンズは、図10に示す構成を有する。各レンズ面の曲率半径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の値は、以下のとおりである。
(Fourth embodiment)
The wide-angle zoom lens according to the fourth embodiment has the configuration shown in FIG. The values of the radius of curvature R (mm) of each lens surface, the center thickness of each lens and the air space D (mm) of each lens, the refractive index Nd of each lens d-line and the Abbe number ABV are as follows.
焦点距離:10.295〜15.598〜23.393
FNO:3.6〜4.15〜4.6
2ω:111.42〜85.5〜62.84
S R D Nd ABV
1 ASPH 72.8710 3.0000 1.74330 49.22
2 ASPH 12.9000 16.2015
3 770.1839 1.1000 1.88300 40.80
4 26.0522 0.3000 1.53610 41.21
5 ASPH 30.6791 1.1966
6 20.4544 4.7353 1.69895 30.05
7 43.9685 D7
8 0.0000 1.5074
9 -68.4574 2.5124 1.68893 31.16
10 -12.6110 1.7924 1.88300 40.80
11 -37.3079 0.1500
12 34.8661 3.7882 1.58913 61.25
13 -13.8945 0.8000 1.80610 33.27
14 -26.8129 D14
15 -30.4122 0.8000 1.77250 49.62
16 20.1071 2.8524 1.84666 23.78
17 292.4999 D17
18 45.2832 4.3580 1.49700 81.61
19 -36.2850 0.1500
20 48.9769 0.9000 1.90366 31.31
21 17.4000 12.2843 1.49700 81.61
22 -14.3000 1.1000 1.90366 31.31
23 -20.2760 0.2000
24 ASPH -37.3436 0.3500 1.51460 49.96
25 -32.4182 1.5000 1.58144 40.89
26 -44.7821
Focal length: 10.295-15.598-23.393
FNO: 3.6-4.15-4.6
2ω: 111.42〜85.5〜62.84
SRD Nd ABV
1 ASPH 72.8710 3.0000 1.74330 49.22
2 ASPH 12.9000 16.2015
3 770.1839 1.1000 1.88300 40.80
4 26.0522 0.3000 1.53610 41.21
5 ASPH 30.6791 1.1966
6 20.4544 4.7353 1.69895 30.05
7 43.9685 D7
8 0.0000 1.5074
9 -68.4574 2.5124 1.68893 31.16
10 -12.6110 1.7924 1.88300 40.80
11 -37.3079 0.1500
12 34.8661 3.7882 1.58913 61.25
13 -13.8945 0.8000 1.80610 33.27
14 -26.8129 D14
15 -30.4122 0.8000 1.77250 49.62
16 20.1071 2.8524 1.84666 23.78
17 292.4999 D17
18 45.2832 4.3580 1.49700 81.61
19 -36.2850 0.1500
20 48.9769 0.9000 1.90366 31.31
21 17.4000 12.2843 1.49700 81.61
22 -14.3000 1.1000 1.90366 31.31
23 -20.2760 0.2000
24 ASPH -37.3436 0.3500 1.51460 49.96
25 -32.4182 1.5000 1.58144 40.89
26 -44.7821
焦点距離:10.295 15.598 23.393
可変間隔
D7 21.1006 10.4692 3.7599
D14 0.8270 7.7520 14.2056
D17 11.0939 5.8381 0.800
Focal length: 10.295 15.598 23.393
Variable interval
D7 21.1006 10.4692 3.7599
D14 0.8270 7.7520 14.2056
D17 11.0939 5.8381 0.800
非球面係数
面1
K : -4.855874
A :0.147578E-04 B :-.354016E-07 C :0.454072E-10 D :-.116025E-13
E :0.227158E-16 F :-.308920E-19 G :-.677424E-22 H :-.335578E-25
J :0.137873E-27
面2
K : -1.110553
A :0.277891E-04 B :0.404370E-07 C :0.612679E-10 D :0.362235E-12
E :-.110342E-13 F :0.528104E-17 G :0.320816E-18 H :0.145731E-21
J :-.347259E-23
面5
K : 0.335030
A :0.226449E-04 B :-.966072E-07 C :0.176373E-09 D :0.114032E-12
E :0.138279E-14
面24
K : -0.608663
A :-.983362E-05 B :0.214587E-07 C :-.114789E-09 D :0.130510E-11
E :-.267583E-14
K: -4.855874
A: 0.147578E-04 B:-. 354016E-07 C: 0.454072E-10 D:-. 116025E-13
E: 0.227158E-16 F:-. 308920E-19 G:-. 677424E-22 H:-. 335578E-25
J: 0.137873E-27
Surface 2
K: -1.110553
A: 0.277891E-04 B: 0.404370E-07 C: 0.612679E-10 D: 0.362235E-12
E:-. 110342E-13 F: 0.528104E-17 G: 0.320816E-18 H: 0.145731E-21
J:-. 347259E-23
K: 0.335030
A: 0.226449E-04 B:-. 966072E-07 C: 0.176373E-09 D: 0.114032E-12
E: 0.138279E-14
Surface 24
K: -0.608663
A:-. 983362E-05 B: 0.214587E-07 C:-. 114789E-09 D: 0.130510E-11
E:-. 267583E-14
第4実施形態の広角ズームレンズの各レンズの焦点距離は、以下のとおりである。
群の焦点距離
第1群: -15.199
第2群: 32.3369
第3群: -40.4942
第4群: 33.2409
Gr1a: -21.5478
Gr1b: -95.6574
The focal length of each lens of the wide-angle zoom lens of the fourth embodiment is as follows.
Group focal length Group 1: -15.199
Second group: 32.3369
Group 3: -40.4942
Group 4: 33.2409
Gr1a: -21.5478
Gr1b: -95.6574
広角端で
第2,3群合成焦点距離: 143.052
第2,3,4群合成焦点距離:31.312
第1,2,3群合成群焦点距離:-24.561
第1,2,3群合成群と4群の主点位置間間隔:87.987
レンズ全長:94.6
望遠端で
第2、3群の合成焦点距離:58.115
At the wide-angle end, 2nd and 3rd group combined focal length: 143.052
2nd, 3rd and 4th lens groups: 31.312
1st, 2nd, 3rd group composite focal length: -24.561
The distance between the principal points of the 1st, 2nd, 3rd group and 4th group: 87.987
Total lens length: 94.6
Combined focal length of groups 2 and 3 at telephoto end
第4実施形態の広角ズームレンズの第11面の形状は、以下のとおりである。
有効径 法線角度
The shape of the first surface of the wide-angle zoom lens of the fourth embodiment is as follows.
Effective diameter Normal angle
第4実施形態の広角ズームレンズの条件式の値は、以下のとおりである。
条件式(1) BFw/(Fnow*Fw) =1.05
条件式(2) F23w/Fw=13.895
条件式(3) F234w/(D12w) =1.484
条件式(4) F234w/(D12w*Fw)=0.144
条件式(5) F3w/F23t=2.462
The values of the conditional expressions of the wide-angle zoom lens of the fourth embodiment are as follows.
Conditional expression (1) BFw / (Fnow * Fw) = 1.05
Conditional expression (2) F23w / Fw = 13.895
Conditional expression (3) F234w / (D12w) = 1.484
Conditional expression (4) F234w / (D12w * Fw) = 0.144
Conditional expression (5) F3w / F23t = 2.462
第4実施形態の広角ズームレンズの広角端の球面収差、非点収差、歪曲収差及び倍率色収差を図11を示す。第1実施形態の広角ズームレンズの望遠端の球面収差、非点収差、歪曲収差及び倍率色収差を図12を示す。 FIG. 11 shows spherical aberration, astigmatism, distortion and lateral chromatic aberration at the wide angle end of the wide angle zoom lens according to the fourth embodiment. FIG. 12 shows spherical aberration, astigmatism, distortion, and lateral chromatic aberration at the telephoto end of the wide-angle zoom lens according to the first embodiment.
特許文献1の第1実施形態の条件式の値は以下のとおりである。
条件式(1) BFw/(Fnow*Fw) =0.865
条件式(2) F23w/Fw=6.528
条件式(3) F234w/(D12w) =1.135
条件式(4) F234w/(D12w*Fw)=0.110
条件式(5) F23w/F23t=1.392
The values of the conditional expressions in the first embodiment of
Conditional expression (1) BFw / (Fnow * Fw) = 0.865
Conditional expression (2) F23w / Fw = 6.528
Conditional expression (3) F234w / (D12w) = 1.135
Conditional expression (4) F234w / (D12w * Fw) = 0.110
Conditional expression (5) F23w / F23t = 1.392
特許文献1の第2実施形態の条件式の値は以下のとおりである。
条件式(1) BFw/(Fnow*Fw) =1.013
条件式(2) F23w/Fw=7.651
条件式(3) F234w/(D12w) =1.316
条件式(4) F234w/(D12w*Fw)=0.128
条件式(5) F23w/F23t=1.340
The values of the conditional expressions in the second embodiment of
Conditional expression (1) BFw / (Fnow * Fw) = 1.013
Conditional expression (2) F23w / Fw = 7.651
Conditional expression (3) F234w / (D12w) = 1.316
Conditional expression (4) F234w / (D12w * Fw) = 0.128
Conditional expression (5) F23w / F23t = 1.340
特許文献1の第3実施形態の条件式の値は以下のとおりである。
条件式(1) BFw/(Fnow*Fw) =0.867
条件式(2) F23w/Fw=9.655
条件式(3) F234w/(D12w) =1.231
条件式(4) F234w/(D12w*Fw)=0.120
条件式(5) F23w/F23t=1.284
The values of the conditional expressions in the third embodiment of
Conditional expression (1) BFw / (Fnow * Fw) = 0.867
Conditional expression (2) F23w / Fw = 9.655
Conditional expression (3) F234w / (D12w) = 1.231
Conditional expression (4) F234w / (D12w * Fw) = 0.120
Conditional expression (5) F23w / F23t = 1.284
特許文献1の第4実施形態の条件式の値は以下のとおりである。
条件式(1) BFw/(Fnow*Fw) =1.013
条件式(2) F23w/Fw=9.074
条件式(3) F234w/(D12w) =1.189
条件式(4) F234w/(D12w*Fw)=0.115
条件式(5) F23w/F23t=1.327
The values of the conditional expressions in the fourth embodiment of
Conditional expression (1) BFw / (Fnow * Fw) = 1.013
Conditional expression (2) F23w / Fw = 9.074
Conditional expression (3) F234w / (D12w) = 1.189
Conditional expression (4) F234w / (D12w * Fw) = 0.115
Conditional expression (5) F23w / F23t = 1.327
特許文献1の第5実施形態の条件式の値は以下のとおりである。
条件式(1) BFw/(Fnow*Fw) =0.978
条件式(2) F23w/Fw=9.641
条件式(3) F234w/(D12w) =1.227
条件式(4) F234w/(D12w*Fw)=0.119
条件式(5) F23w/F23t=1.457
The values of the conditional expressions in the fifth embodiment of
Conditional expression (1) BFw / (Fnow * Fw) = 0.978
Conditional expression (2) F23w / Fw = 9.641
Conditional expression (3) F234w / (D12w) = 1.227
Conditional expression (4) F234w / (D12w * Fw) = 0.119
Conditional expression (5) F23w / F23t = 1.457
特許文献1の第6実施形態の条件式の値は以下のとおりである。
条件式(1) BFw/(Fnow*Fw) =1.015
条件式(2) F23w/Fw=9.764
条件式(3) F234w/(D12w) =1.190
条件式(4) F234w/(D12w*Fw)=0.116
条件式(5) F23w/F23t=1.427
The values of the conditional expressions in the sixth embodiment of
Conditional expression (1) BFw / (Fnow * Fw) = 1.015
Conditional expression (2) F23w / Fw = 9.764
Conditional expression (3) F234w / (D12w) = 1.190
Conditional expression (4) F234w / (D12w * Fw) = 0.116
Conditional expression (5) F23w / F23t = 1.427
Gr1A 第1レンズ群の前群
Gr1B 第1レンズ群の後群
Gr1A Front group of the first lens group Gr1B Rear group of the first lens group
Claims (8)
条件式(1)1.03 ≦ BFw/(Fnow*Fw) ≦ 1.2
但し、
BFw :バックフォーカス
Fnow:広角端でのFナンバー
Fw :広角端での光学全系の焦点距離 In order from the object, each lens group includes a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a fourth lens group having a positive refractive power. A wide-angle zoom lens that performs zooming by moving the lens, and the distance between groups, the focal length of each group, and the focal length of the combined group of the groups satisfy the following conditional expression.
Conditional expression (1) 1.03 ≤ BFw / (Fnow * Fw) ≤ 1.2
However,
BFw: Back focus
Fnow: F number at the wide-angle end
Fw: Focal length of the entire optical system at the wide-angle end
条件式(2)F23w/Fw ≧ 12
但し、
F23w:広角端での第2レンズ群と第3レンズ群の合成焦点距離
Fw :広角端での光学全系の焦点距離 In order from the object, each lens group includes a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a fourth lens group having a positive refractive power. A wide-angle zoom lens that performs zooming by moving the lens, and the distance between groups, the focal length of each group, and the focal length of the combined group of the groups satisfy the following conditional expression.
Conditional expression (2) F23w / Fw ≧ 12
However,
F23w: Combined focal length of the second and third lens units at the wide-angle end
Fw: Focal length of the entire optical system at the wide-angle end
条件式(3)F234w/(D_12w) ≧ 1.3
但し、
F234w:広角端での第2、3、4群の合成焦点距離
D12w :無限遠での広角端の第1レンズ群と第2レンズ群の間隔 In order from the object, each lens group includes a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a fourth lens group having a positive refractive power. A wide-angle zoom lens that performs zooming by moving the lens, and the distance between groups, the focal length of each group, and the focal length of the combined group of the groups satisfy the following conditional expression.
Conditional expression (3) F234w / (D_12w) ≧ 1.3
However,
F234w: Composite focal length of the 2nd, 3rd and 4th groups at the wide-angle end
D12w: Distance between the first and second lens units at the wide-angle end at infinity
を満たすことを特徴とする請求項1ないし5のいずれか一項に記載の広角ズームレンズ。
但し、
F234w:広角端での第2、3、4群の合成焦点距離
D12w :無限遠での広角端の第1レンズ群と第2レンズ群の間隔
Fw :広角端で光学全系の焦点距離 Furthermore, conditional expression (4) F234w / (D12w * Fw) ≧ 0.13
The wide-angle zoom lens according to claim 1, wherein:
However,
F234w: Composite focal length of the 2nd, 3rd and 4th groups at the wide-angle end
D12w: Distance between the first and second lens units at the wide-angle end at infinity
Fw: Focal length of the entire optical system at the wide angle end
を満たすことを特徴とする請求項1ないし6のいずれか一項に記載の広角ズームレンズ。
但し、
F23w:広角端で第2レンズ群と第3レンズ群の合成焦点距離
F23t:望遠端で第2レンズ群と第3レンズ群の合成焦点距離 Furthermore, conditional expression (5) | F23w / F23t | ≧ 2.0
The wide-angle zoom lens according to claim 1, wherein:
However,
F23w: Combined focal length of the second and third lens units at the wide-angle end
F23t: Combined focal length of the second and third lens units at the telephoto end
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CN201410031012.0A CN103744171B (en) | 2009-04-13 | 2010-04-13 | wide-angle zoom lens |
US12/662,355 US8169718B2 (en) | 2009-04-13 | 2010-04-13 | Wide-angle zoom lens |
CN201410030706.2A CN103744170B (en) | 2009-04-13 | 2010-04-13 | Wide-angle zoom lens |
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