JP2010249956A - Wide-angle zoom lens - Google Patents
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- JP2010249956A JP2010249956A JP2009097397A JP2009097397A JP2010249956A JP 2010249956 A JP2010249956 A JP 2010249956A JP 2009097397 A JP2009097397 A JP 2009097397A JP 2009097397 A JP2009097397 A JP 2009097397A JP 2010249956 A JP2010249956 A JP 2010249956A
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本発明は、広角ズームレンズ、さらに詳しくは、画角100°を超え、ズーム比2倍を超える一眼レフデジタルカメラ用の超広角、高ズーム比2以上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 having a super-wide angle and a high zoom ratio of 2 or more for a single-lens reflex digital camera having an angle of view exceeding 100 ° and a zoom ratio exceeding twice.
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。これらの従来の広角ズームレンズにおいては、広角端の画角が100°を超えると共に、2倍以上のズーム比を実現しようとしている。
すなわち、特許文献1は、広角端の画角が105.8°程度、ズーム比1.95〜2.36程度が開示されている。
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 these conventional wide-angle zoom lenses, the angle of view at the wide-angle end exceeds 100 °, and an attempt is made to realize a zoom ratio of 2 times or more.
That is,
これら従来の広角ズームレンズには、第1群内は複数非球面を用いることが一般的になっている。特に、例えば特許文献1のように、最も物体側のレンズを像面へ凹面を向けた非常に強い負の屈折力を持つメニスカスレンズとしている。これらのレンズは、物体側の第1面を非球面とすることにより、画角を広くし、第1群の小型化を図り、諸収差を補正している。
In these conventional wide-angle zoom lenses, it is common to use a plurality of aspheric surfaces in the first lens group. In particular, as in
上記文献1によって提案されているズームレンズは、最も物体側のレンズは負の屈折力を強く設定することにより、加工可能な硝材ガラスの表面を非球面とし、広角端の画角を105°程度とし、前枠の有効径を小さく抑えることができる等の利点を有している。しかし、広角端の画角をさらに大きくすることは困難である。
In the zoom lens proposed by the above-mentioned
また、広角端の画角を105°程度にするとともに、前枠有効径の小型化を実現するために、第1レンズの第1面の非球面形状は、光軸から有効径の3割前後まで、面の法線角度の変化度合いすなわち増加スピードが緩く、3割前後から10割まで面の法線角度の増加スピードが速くなる。その結果、広角端像高の3〜5割範囲の像面湾曲と非点収差を補正することが困難となっている。 In addition, the aspherical shape of the first surface of the first lens is about 30% of the effective diameter from the optical axis in order to reduce the angle of view at the wide angle end to about 105 ° and to reduce the effective diameter of the front frame. The degree of change of the normal angle of the surface, that is, the increasing speed is slow, and the increasing speed of the normal angle of the surface is increased from about 30% to 100%. As a result, it is difficult to correct field curvature and astigmatism in the range of 30 to 50% of the wide-angle end image height.
(発明の目的)
本発明は前記従来例を鑑みなされたもので、広角端の画角が110°を超えるズームレンズにおいて、2倍以上のズーム比を実現すると共に、第1群を小型化した広角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 conventional example, and provides a wide-angle zoom lens that realizes a zoom ratio of 2 times or more in a zoom lens having an angle of view at a wide-angle end of more than 110 ° and that has a reduced first group. The purpose is to do.
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、前記第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、負の屈折力の第1レンズ群の後群レンズ群で構成し、無限遠物体から近距離へのフォーカシングを第1レンズ群の後群レンズ群を物体側へ移動させて行い、第1レンズ群の最も物体側のレンズを像側へ凹面を向けた負メニスカスレンズとし、このレンズに両面非球面を設け、第1レンズ群の前群レンズ群と後群レンズ群の焦点距離が以下の条件式を満たすようにしたことを特徴とする広角ズームレンズ。
条件式(1)3.5 ≦ |f1b/f1a| ≦ 6.0
但し、
f1a:第1レンズ群の前群レンズ群の焦点距離
f1b:第1レンズ群の後群レンズ群の焦点距離
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. The first lens group is composed of a front lens group of the first lens group having a negative refractive power and a rear lens group of the first lens group having a negative refractive power, and is infinite. Focusing from a far object to a short distance is performed by moving the rear lens group of the first lens group toward the object side, and the lens closest to the object side of the first lens group is a negative meniscus lens with a concave surface facing the image side. A wide-angle zoom lens characterized in that a double-sided aspheric surface is provided on this lens, and the focal lengths of the front lens group and rear lens group of the first lens group satisfy the following conditional expression.
Conditional expression (1) 3.5 ≤ | f1b / f1a | ≤ 6.0
However,
f1a: Focal length of the front lens group of the first lens group
f1b: focal length of the rear lens group of the first lens group.
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、前記第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、負の屈折力の第1レンズ群の後群レンズ群で構成し、無限遠物体から近距離へのフォーカシングを第1レンズ群の後群レンズ群を物体側へ移動させて行い、第1レンズ群の最も物体側のレンズを像側へ凹面を向けた負メニスカスレンズとし、このレンズに両面非球面を設け、面形状が以下の条件式を満たすようにしたことを特徴とする広角ズームレンズ。
条件式(2)3.5 ≦ θ25 ≦ 6.5
条件式(3)4.5 ≦ θ100/θ25 ≦ 7.0
但し、
θ25:第1レンズの物体側の非球面有効径の2.5割の高さにおける面の法線角度
θ100:第1レンズの物体側の非球面有効径の10割の高さにおける面の法線角度
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. The first lens group is composed of a front lens group of the first lens group having a negative refractive power and a rear lens group of the first lens group having a negative refractive power, and is infinite. Focusing from a far object to a short distance is performed by moving the rear lens group of the first lens group toward the object side, and the lens closest to the object side of the first lens group is a negative meniscus lens with a concave surface facing the image side. A wide-angle zoom lens characterized in that a double-sided aspheric surface is provided on this lens so that the surface shape satisfies the following conditional expression.
Conditional expression (2) 3.5 ≤ θ25 ≤ 6.5
Conditional expression (3) 4.5 ≤ θ100 / θ25 ≤ 7.0
However,
θ25: Normal angle of the surface at the height of 2.5% of the effective aspheric diameter on the object side of the first lens θ100: Normal angle of the surface at the height of 100% of the effective diameter of the aspheric surface on the object side of the first lens It is.
本発明の実施態様は、以下のとおりである。
さらに、条件式(4) Ymax/Fw ≧ 1.3
を満たすようにしたことを特徴とする請求項1又は2記載の広角ズームレンズ。
但し、
Ymax: 最大像高(実像高)
Fw : 全系の広角端での焦点距離
Embodiments of the present invention are as follows.
Furthermore, conditional expression (4) Ymax / Fw ≧ 1.3
The wide-angle zoom lens according to
However,
Ymax: Maximum image height (real image height)
Fw: Focal length at the wide-angle end of the entire system
さらに、条件式(2)3.5 ≦ θ25 ≦ 6.5
条件式(3)4.5 ≦ θ100/θ25 ≦ 7.0
を満たすようにしたことを特徴とする請求項1に記載の広角ズームレンズ。
但し、
θ25:第1レンズの物体側の非球面有効径の2.5割の高さにおける面の法線角度
θ100:第1レンズの物体側の非球面有効径の10割の高さにおける面の法線角度
Furthermore, conditional expression (2) 3.5 ≦ θ25 ≦ 6.5
Conditional expression (3) 4.5 ≤ θ100 / θ25 ≤ 7.0
The wide-angle zoom lens according to
However,
θ25: Normal angle of the surface at the height of 2.5% of the effective aspheric diameter on the object side of the first lens θ100: Normal angle of the surface at the height of 100% of the effective diameter of the aspheric surface on the object side of the first lens
さらに、条件式(5)0.7 ≦ G1R2/F1 ≦ 0.9
を満たすようにしたことを特徴とする請求項1ないし4のうちの一項に記載の広角ズームレンズ。
但し、
G1R2:第1レンズの像面側の面の曲率半径
F1:第1レンズ群の焦点距離
Furthermore, conditional expression (5) 0.7 ≦ G1R2 / F1 ≦ 0.9
The wide-angle zoom lens according to
However,
G1R2: Radius of curvature of the image side of the first lens
F1: Focal length of the first lens group
(発明の条件式の説明)
広角端で110°以上の画角を確保し、第1群の有効径を小型化するため、条件式(1)を規定した。
条件式(1)の下限を超えると、第1レンズ群の前群レンズ群のパワーが(パワー=焦点距離の逆数)弱くなって、広角端の画角が110°を実現することが困難になる。条件式(1)の下限を超えると、さらに、第1群の有効径小型化が困難となり、また非点収差、像面湾曲等が発生する。
条件式(1)の上限を超えると、第1レンズ群の後群レンズ群のパワーが弱くなって、フォーカス移動量が大きくなる。条件式(1)の上限を超えると、さらに、第1レンズ群の前群レンズ群とフォーカス群が干渉しがちになり、また球面収差、色収差等が発生する。
条件式(1)を、4.0 ≦ |f1b/f1a| ≦ 5.0
とすることによって、本発明の効果をより確実なものとすることができる。
(Explanation of conditional expressions of the invention)
In order to secure an angle of view of 110 ° or more at the wide-angle end and to reduce the effective diameter of the first group, conditional expression (1) is defined.
When the lower limit of conditional expression (1) is exceeded, the power of the front lens group of the first lens group becomes weak (power = the reciprocal of the focal length), making it difficult to realize a field angle of 110 ° at the wide angle end. Become. If the lower limit of conditional expression (1) is exceeded, it will be difficult to reduce the effective diameter of the first group, and astigmatism, curvature of field, etc. will occur.
If the upper limit of conditional expression (1) is exceeded, the power of the rear lens group of the first lens group becomes weak and the amount of focus movement increases. When the upper limit of conditional expression (1) is exceeded, the front lens group and the focus group of the first lens group tend to interfere with each other, and spherical aberration, chromatic aberration, and the like occur.
Conditional expression (1) is changed to 4.0 ≤ | f1b / f1a | ≤ 5.0
By doing so, the effect of the present invention can be made more reliable.
条件式(2)と条件式(3)は、最も物体側の負メニスカスレンズの物体側の面の非球面形状を規定した。条件式(2)の下限を超えると、最も物体側の第1レンズの第1面の法線角度が光軸から2.5割まで小さくなって、広角端の3〜5割の像面湾曲と非点収差を抑えることが困難となる。
条件式(2)の上限を超えると、第1レンズのパワーが弱くなって、広角端で110°の画角を確保することが困難となる。条件式(2)の上限を超えると、さらに、球面収差、歪曲収差等が発生する。
条件式(2)を、3.8 ≦ θ25 ≦ 5.2
とすることによって、本発明の効果をより確実なものとすることができる。
Conditional expression (2) and conditional expression (3) define the aspherical shape of the object side surface of the negative meniscus lens closest to the object side. When the lower limit of conditional expression (2) is exceeded, the normal angle of the first surface of the first lens closest to the object side is reduced to 2.5% from the optical axis, and the curvature of field is 30 to 50% at the wide angle end. It becomes difficult to suppress astigmatism.
If the upper limit of conditional expression (2) is exceeded, the power of the first lens becomes weak, and it becomes difficult to secure a 110 ° field angle at the wide-angle end. If the upper limit of conditional expression (2) is exceeded, further spherical aberration, distortion, etc. occur.
Conditional expression (2) is expressed as 3.8 ≤ θ25 ≤ 5.2
By doing so, the effect of the present invention can be made more reliable.
条件式(3)の下限を超えると、広角端で、10割像高の非点収差と象面湾曲とディストーション収差を抑えることが困難となる。
条件式(3)の上限を超えると、第1負のメニスカス非球面ガラスモルトは、加工することが困難となる。条件式(3)の上限を超えると、さらに、非点収差、像面湾曲等が発生する。
条件式(3)を、5.3 ≦ θ100/θ25 ≦ 7.0
とすることによって、本発明の効果をより確実なものとすることができる。
When the lower limit of conditional expression (3) is exceeded, it becomes difficult to suppress astigmatism, quadratic curvature, and distortion aberration at a 10% image height at the wide angle end.
When the upper limit of conditional expression (3) is exceeded, it is difficult to process the first negative meniscus aspheric glass malt. If the upper limit of conditional expression (3) is exceeded, astigmatism, curvature of field, and the like further occur.
Conditional expression (3) is changed to 5.3 ≤ θ100 / θ25 ≤ 7.0
By doing so, the effect of the present invention can be made more reliable.
条件式(4)は、最大像高と全光学系の広角端での焦点距離の関係を規定する。条件式(4)の下限を超えると、像高が足りないあるいは110°の画角を達成できない等の問題が発生する。
条件式(4)を、1.35 ≦ Ymax/Fw ≦ 1.45
とすることによって、本発明の効果をより確実なものとすることができる。
Conditional expression (4) defines the relationship between the maximum image height and the focal length at the wide-angle end of the entire optical system. If the lower limit of conditional expression (4) is exceeded, problems such as insufficient image height or the inability to achieve a 110 ° field angle occur.
Conditional expression (4) is expressed as 1.35 ≤ Ymax / Fw ≤ 1.45
By doing so, the effect of the present invention can be made more reliable.
条件式(5)は、最も物体側の負メニスカスレンズの像面側の面の曲率半径と第1群の焦点距離の比を規定した。条件式(5)の下限を超えると、第1レンズの第2面の曲率半径が強くなって、ガラスモルトレンズすなわちガラス非球面の面形状が強すぎると、加工が困難となる。条件式(5)の下限を超えると、さらに、時点収差、歪曲収差等が発生する。
条件式(5)の上限を超えると、第1レンズは強いパワーを持つため、第1面の曲率半径が大きくなり、広角端の110°の画角を実現するため、第1面の法線角度は光軸から周辺まで、増加スピードが緩く、3割前後から面の法線角度の増加スピードが急に大きくなる。その結果、広角端の中間像高の像面湾曲と非点収差を補正することが困難となる。
条件式(5)を、0.835 ≦ G1R2/F1 ≦ 0.9
とすることによって、本発明の効果をより確実なものとすることができる。
Conditional expression (5) defines the ratio between the radius of curvature of the image side surface of the negative meniscus lens closest to the object side and the focal length of the first group. If the lower limit of conditional expression (5) is exceeded, the radius of curvature of the second surface of the first lens becomes strong, and if the surface shape of the glass malt lens, that is, the glass aspheric surface is too strong, processing becomes difficult. When the lower limit of conditional expression (5) is exceeded, further, time point aberration, distortion aberration and the like occur.
If the upper limit of conditional expression (5) is exceeded, the first lens has strong power, so the radius of curvature of the first surface becomes large, and the normal of the first surface is realized in order to realize a field angle of 110 ° at the wide angle end. The angle increases slowly from the optical axis to the periphery, and the increasing speed of the normal angle of the surface suddenly increases from around 30%. As a result, it becomes difficult to correct curvature of field and astigmatism at the intermediate image height at the wide-angle end.
Conditional expression (5) is changed to 0.835 ≤ G1R2 / F1 ≤ 0.9
By doing so, 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、広角端の画角が110°を超えると共に、像面湾曲と非点収差を良好に補正することができる。また、各条件式を満たすことにより、第1群の面形状と第1群内のレンズパワー配置を適切して、第1群とフォーカス群の小型化を実現することができる。 In the wide-angle zoom lens of the present invention, the field angle at the wide-angle end exceeds 110 °, and field curvature and astigmatism can be corrected well. Further, by satisfying each conditional expression, it is possible to realize the size reduction of the first group and the focus group by appropriately adjusting the surface shape of the first group and the lens power arrangement in the first group.
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 eleventh 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) |f1b/f1a|=4.783
条件式(2) θ25=4.22
条件式(3) θ100/θ25=6.142
条件式(4) Ymax/Fw=1.409
条件式(5) G1R2/F1=0.872
The values of the conditional expressions of the wide angle zoom lens of the first embodiment are as follows.
Conditional expression (1) | f1b / f1a | = 4.783
Conditional expression (2) θ25 = 4.22
Conditional expression (3) θ100 / θ25 = 6.142
Conditional expression (4) Ymax / Fw = 1.409
Conditional expression (5) G1R2 / F1 = 0.872
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 eleventh 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) |f1b/f1a|=4.875
条件式(2) θ25=3.978
条件式(3) θ100/θ25=6.769
条件式(4) Ymax/Fw=1.409
条件式(5) G1R2/F1=0.882
The values of the conditional expressions of the wide angle zoom lens of the second embodiment are as follows.
Conditional expression (1) | f1b / f1a | = 4.875
Conditional expression (2) θ25 = 3.978
Conditional expression (3) θ100 / θ25 = 6.769
Conditional expression (4) Ymax / Fw = 1.409
Conditional expression (5) G1R2 / F1 = 0.882
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 eleventh 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) |f1b/f1a|=4.989
条件式(2) θ25=4.203
条件式(3) θ100/θ25=6.179
条件式(4) Ymax/Fw=1.409
条件式(5) G1R2/F1=0.869
The values of the conditional expressions of the wide angle zoom lens of the third embodiment are as follows.
Conditional expression (1) | f1b / f1a | = 4.989
Conditional expression (2) θ25 = 4.203
Conditional expression (3) θ100 / θ25 = 6.179
Conditional expression (4) Ymax / Fw = 1.409
Conditional expression (5) G1R2 / F1 = 0.869
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 eleventh 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) |f1b/f1a|=4.439
条件式(2) θ25=5.077
条件式(3) θ100/θ25=5.448
条件式(4) Ymax/Fw=1.409
条件式(5) G1R2/F1=0.849
The values of the conditional expressions of the wide-angle zoom lens of the fourth embodiment are as follows.
Conditional expression (1) | f1b / f1a | = 4.439
Conditional expression (2) θ25 = 5.077
Conditional expression (3) θ100 / θ25 = 5.448
Conditional expression (4) Ymax / Fw = 1.409
Conditional expression (5) G1R2 / F1 = 0.849
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) |f1b/f1a|=1.349
条件式(2) θ25=2.853
条件式(3) θ100/θ25=9.742
条件式(4) Ymax/Fw=1.254
条件式(5) G1R2/F1=1.250
The values of the conditional expressions in the first embodiment of
Conditional expression (1) | f1b / f1a | = 1.349
Conditional expression (2) θ25 = 2.853
Conditional expression (3) θ100 / θ25 = 9.742
Conditional expression (4) Ymax / Fw = 1.254
Conditional expression (5) G1R2 / F1 = 1.250
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) |f1b/f1a|=1.707
条件式(2) θ25=1.146
条件式(3) θ100/θ25=25.204
条件式(4) Ymax/Fw=1.2708
条件式(5) G1R2/F1=1.280
The values of the conditional expressions in the second embodiment of
Conditional expression (1) | f1b / f1a | = 1.707
Conditional expression (2) θ25 = 1.146
Conditional expression (3) θ100 / θ25 = 25.204
Conditional expression (4) Ymax / Fw = 1.708
Conditional expression (5) G1R2 / F1 = 1.280
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) |f1b/f1a|=3.042
条件式(2) θ25=0.252
条件式(3) θ100/θ25=75.963
条件式(4) Ymax/Fw=1.256
条件式(5) G1R2/F1=1.104
The values of the conditional expressions in the third embodiment of
Conditional expression (1) | f1b / f1a | = 3.042
Conditional expression (2) θ25 = 0.552
Conditional expression (3) θ100 / θ25 = 75.963
Conditional expression (4) Ymax / Fw = 1.256
Conditional expression (5) G1R2 / F1 = 1.104
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) |f1b/f1a|=1.449
条件式(2) θ25=0.845
条件式(3) θ100/θ25=29.206
条件式(4) Ymax/Fw=1.261
条件式(5) G1R2/F1=1.155
The values of the conditional expressions in the fourth embodiment of
Conditional expression (1) | f1b / f1a | = 1.449
Conditional expression (2) θ25 = 0.845
Conditional expression (3) θ100 / θ25 = 29.206
Conditional expression (4) Ymax / Fw = 1.261
Conditional expression (5) G1R2 / F1 = 1.155
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) |f1b/f1a|=1.443
条件式(2) θ25=0.837
条件式(3) θ100/θ25=27.419
条件式(4) Ymax/Fw=1.288
条件式(5) G1R2/F1=1.146
The values of the conditional expressions in the fifth embodiment of
Conditional expression (1) | f1b / f1a | = 1.443
Conditional expression (2) θ25 = 0.837
Conditional expression (3) θ100 / θ25 = 27.419
Conditional expression (4) Ymax / Fw = 1.288
Conditional expression (5) G1R2 / F1 = 1.146
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) |f1b/f1a|=2.195
条件式(2) θ25=0.851
条件式(3) θ100/θ25=26.901
条件式(4) Ymax/Fw=1.258
条件式(5) G1R2/F1=1.176
。
The values of the conditional expressions in the sixth embodiment of
Conditional expression (1) | f1b / f1a | = 2.195
Conditional expression (2) θ25 = 0.851
Conditional expression (3) θ100 / θ25 = 26.901
Conditional expression (4) Ymax / Fw = 1.258
Conditional expression (5) G1R2 / F1 = 1.176
.
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 (5)
条件式(1)3.5 ≦ |f1b/f1a| ≦ 6.0
但し、
f1a:第1レンズ群の前群レンズ群の焦点距離
f1b:第1レンズ群の後群レンズ群の焦点距離 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. The first lens group is composed of a front lens group of the first lens group having a negative refractive power and a rear lens group of the first lens group having a negative refractive power, and is infinite. Focusing from a far object to a short distance is performed by moving the rear lens group of the first lens group to the object side, and the lens closest to the object side of the first lens group is a negative meniscus lens with a concave surface facing the image side, A wide-angle zoom lens characterized in that a double-sided aspheric surface is provided on this lens so that the focal lengths of the front lens group and rear lens group of the first lens group satisfy the following conditional expression.
Conditional expression (1) 3.5 ≤ | f1b / f1a | ≤ 6.0
However,
f1a: Focal length of the front lens group of the first lens group
f1b: Focal length of the rear lens group of the first lens group
条件式(2)3.5 ≦ θ25 ≦ 6.5
条件式(3)4.5 ≦ θ100/θ25 ≦ 7.0
但し、
θ25:第1レンズの物体側の非球面有効径の2.5割の高さにおける面の法線角度
θ100:第1レンズの物体側の非球面有効径の10割の高さにおける面の法線角度。 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. The first lens group is composed of a front lens group of the first lens group having a negative refractive power and a rear lens group of the first lens group having a negative refractive power, and is infinite. Focusing from a far object to a short distance is performed by moving the rear lens group of the first lens group toward the object side, and the lens closest to the object side of the first lens group is a negative meniscus lens with a concave surface facing the image side. A wide-angle zoom lens characterized in that a double-sided aspheric surface is provided on this lens so that the surface shape satisfies the following conditional expression.
Conditional expression (2) 3.5 ≤ θ25 ≤ 6.5
Conditional expression (3) 4.5 ≤ θ100 / θ25 ≤ 7.0
However,
θ25: Normal angle of the surface at the height of 2.5% of the effective aspheric diameter on the object side of the first lens θ100: Normal angle of the surface at the height of 100% of the effective diameter of the aspheric surface on the object side of the first lens .
を満たすようにしたことを特徴とする請求項1又は2記載の広角ズームレンズ。
但し、
Ymax: 最大像高(実像高)
Fw : 全光学系の広角端での焦点距離 Furthermore, conditional expression (4) Ymax / Fw ≧ 1.3
The wide-angle zoom lens according to claim 1, wherein:
However,
Ymax: Maximum image height (real image height)
Fw: Focal length at the wide-angle end of all optical systems
条件式(3)4.5 ≦ θ100/θ25 ≦ 7.0
を満たすようにしたことを特徴とする請求項1に記載の広角ズームレンズ。
但し、
θ25:第1レンズの物体側の非球面有効径の2.5割の高さにおける面の法線角度
θ100:第1レンズの物体側の非球面有効径の10割の高さにおける面の法線角度。 Furthermore, conditional expression (2) 3.5 ≦ θ25 ≦ 6.5
Conditional expression (3) 4.5 ≤ θ100 / θ25 ≤ 7.0
The wide-angle zoom lens according to claim 1, wherein:
However,
θ25: Normal angle of the surface at the height of 2.5% of the effective aspheric diameter on the object side of the first lens θ100: Normal angle of the surface at the height of 100% of the effective diameter of the aspheric surface on the object side of the first lens .
を満たすようにしたことを特徴とする請求項1ないし4のうちの一項に記載の広角ズームレンズ。
但し、
G1R2:第1レンズの像面側の面の曲率半径
F1:第1レンズ群の焦点距離 Furthermore, conditional expression (5) 0.7 ≦ G1R2 / F1 ≦ 0.9
The wide-angle zoom lens according to claim 1, wherein the zoom lens according to claim 1 is satisfied.
However,
G1R2: Radius of curvature of the image side of the first lens
F1: Focal length of the first lens group
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CN201410030706.2A CN103744170B (en) | 2009-04-13 | 2010-04-13 | Wide-angle zoom lens |
CN201010146463.0A CN101859019B (en) | 2009-04-13 | 2010-04-13 | Wide-angle zoom lens |
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JP2016126281A (en) * | 2015-01-08 | 2016-07-11 | 株式会社タムロン | Wide-angle zoom lens and imaging apparatus |
JP2016126280A (en) * | 2015-01-08 | 2016-07-11 | 株式会社タムロン | Wide-angle zoom lens and imaging apparatus |
JP2018097053A (en) * | 2016-12-09 | 2018-06-21 | 株式会社リコー | Zoom optical system |
JP2019003198A (en) * | 2018-08-01 | 2019-01-10 | 株式会社ニコン | Zoom lens and imaging apparatus |
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DE102014016653A1 (en) | 2013-11-13 | 2015-05-13 | Fujifilm Corporation | ZOOM LENS AND IMAGING DEVICE |
DE102014016741A1 (en) | 2013-11-13 | 2015-05-13 | Fujifilm Corporation | ZOOMOBJECTIVE AND PICTURE DEVICE |
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JP2019003198A (en) * | 2018-08-01 | 2019-01-10 | 株式会社ニコン | Zoom lens and imaging apparatus |
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