JP2010249958A - Wide-angle zoom lens - Google Patents

Wide-angle zoom lens Download PDF

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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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wide
lens
group
focal length
refractive power
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Masaki Harada
Daiyu Ri
Hiroshi Yamamoto
壮基 原田
浩史 山本
大勇 李
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Nikon Corp
Tamron Co Ltd
株式会社タムロン
株式会社ニコン
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Priority to JP2009097399A priority Critical patent/JP2010249958A/en
Priority claimed from US12/662,355 external-priority patent/US8169718B2/en
Publication of JP2010249958A publication Critical patent/JP2010249958A/en
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Abstract

PROBLEM TO BE SOLVED: To provide a wide-angle zoom lens that ensures an angle of view as wide as 105° or even wider at the wide-angle end and provides a zoom ratio more than 2 and a back focus 3.7 or more times as long as the focal length at the wide-angle end.
SOLUTION: The wide-angle zoom lens includes a first lens group of negative refractive power, a second lens group of positive refractive power, a third lens group of negative refractive power, and a fourth lens group of positive refractive power in the order from an object side, and moves each lens group to vary optical power. The intervals between the lens groups adjacent to each other, a focal length of each lens group, and the focal length of a composite lens unit(s) of some of the lens groups meet requirements defined by following conditional formula (1): 1.03≤BFw/(Fnow*Fw)≤1.2, where BFw is a back focus, Fnow is an F-number at the wide-angle end, and Fw is a focal length of the entire optics at the wide-angle end.
COPYRIGHT: (C)2011,JPO&INPIT

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 is a wide-angle zoom lens, and more particularly, angle 105 °, greater than 2.2 times zoom ratio relates SLR wide-angle zoom lens for a digital camera having 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、 As a conventional SLR super wide-angle zoom lens for flex camera, in order from the object side to the image side, a first lens unit having a negative refractive power, a second lens unit having positive refractive power, a third lens having a negative refractive power group, and a fourth lens unit having positive refractive power, upon zooming to the telephoto end than at the wide-angle end, the distance between the first lens group and the second lens group decreases, the second lens group and the third lens interval groups is increased, a third lens group and the zoom lens distance of the fourth lens group decreases, BFW back focus at the wide-angle end, the focal length of the entire system at the wide angle end fw, the second lens when the group and the focal length of the fourth lens group with each f2, f4,
2.9<bfw/fw<5.0 2.9 <bfw / fw <5.0
3.1<f4/fw<4.5 3.1 <f4 / fw <4.5
0.1<fw/f2<0.42 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)。 Zoom lens satisfies the following condition has been proposed (e.g., see Patent Document 1).

特開2006−039531号広報 JP 2006-039531 public relations

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。 These conventional wide-angle zoom lens, negative, positive, negative, a four-unit zoom lens type comprising a lens group having positive refractive power. 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。 In the conventional wide-angle zoom lens of Patent Document 1, there are about 105 ° angle of view at the wide-angle end, the effective diameter of the front frame has the advantage of a long back focus to suppress, however, 2. twice to achieve a zoom ratio, it is difficult to meet the demands of 3.7 times or more the back focus of the wide-angle end focal length.

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。 The present invention has been made in view of the aforementioned problems of the conventional wide-angle zoom lens. 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 provides a zoom lens which ensures that more than angle is 105 ° at the wide angle end, to achieve a zoom ratio of more than 2 times, a wide-angle lens having a focal 3.7 times more back focus length at the wide angle end an object of the present invention is to provide a.

第1発明は、 A first aspect of the present invention,
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。 In order from an object, a first lens unit having a negative refractive power, a second lens unit having positive refractive power, a third lens unit having a negative refractive power, a fourth lens unit having positive refractive power, the lens groups the move perform zooming, wide-angle zoom lens focal length synthesis group spacing and the focal length and the group of each group between groups satisfies the following conditional expression.
条件式(1)1.03 ≦ BFw/(Fnow*Fw) ≦ 1.2 Conditional expressions (1) 1.03 ≦ BFw / (Fnow * Fw) ≦ 1.2
但し、 However,
BFw :バックフォーカス BFw: back focus
Fnow:広角端でのFナンバー Fnow: F-number at the wide-angle end
Fw :広角端での光学全系の焦点距離である。 Fw: the focal length of the overall optical system at the wide-angle end.

第2発明は、 The second aspect of the present invention,
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。 In order from an object, a first lens unit having a negative refractive power, a second lens unit having positive refractive power, a third lens unit having a negative refractive power, a fourth lens unit having positive refractive power, the lens groups the move perform zooming, wide-angle zoom lens focal length synthesis group spacing and the focal length and the group of each group between groups satisfies the following conditional expression.
条件式(2)F23w/Fw ≧ 12 Conditional expression (2) F23w / Fw ≧ 12
但し、 However,
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 F23w: second lens unit at the wide angle end and the composite focal length of the third lens group
Fw :広角端での光学全系の焦点距離である。 Fw: the focal length of the overall optical system at the wide-angle end.

第3発明は、 The third aspect of the present invention,
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。 In order from an object, a first lens unit having a negative refractive power, a second lens unit having positive refractive power, a third lens unit having a negative refractive power, a fourth lens unit having positive refractive power, the lens groups the move perform zooming, wide-angle zoom lens focal length synthesis group spacing and the focal length and the group of each group between groups satisfies the following conditional expression.
条件式(3)F234w/(D12w) ≧ 1.3 The conditional expression (3) F234w / (D12w) ≧ 1.3
但し、 However,
F234w:広角端での第2、3、4群の合成焦点距離 F234w: composite focal length of the second, third, and fourth groups at the wide-angle end
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。 D12w: a distance between the first lens group and the second lens unit at the wide angle end in infinity.

本発明の実施態様は、以下のとおりである。 Embodiments of the present invention is as follows.
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。 In the first invention, further, characterized by satisfying the 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 and second aspects of the invention, further characterized by satisfying the conditional expression (3).

さらに、条件式(4)F234w/(D12w*Fw) ≧ 0.13 In addition, the conditional expression (4) F234w / (D12w * Fw) ≧ 0.13
を満たすことを特徴とする。 And it satisfies the.
但し、 However,
F234w:広角端での第2、3、4群の合成焦点距離 F234w: composite focal length of the second, third, and fourth groups at the wide-angle end
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 D12w: infinity first lens unit at the wide angle end in the interval between the second lens group
Fw :広角端での光学全系の焦点距離 Fw: focal length of the overall optical system at the wide-angle end

さらに、条件式(5) |F23w/F23t| ≧ 2.0 In addition, the conditional expression (5) | F23w / F23t | ≧ 2.0
を満たすことを特徴とする。 And it satisfies the.
但し、 However,
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 F23w: the second lens group at the wide angle end and the composite focal length of the third lens group
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 F23t: the second lens group at the telephoto end and the composite focal length of the third lens group

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 consists of the group lens group of the first lens group of negative front lens group of the first lens group refractive power and the negative refractive power, from an infinity object to a close characterized by a focusing moving the group rear lens group of the first lens group toward the object side.

(発明の条件式の説明) (Description of the condition of the invention)
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。 Condition (1) defines the F-number of relationships in the back focus and the wide-angle end. 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。 If the upper limit of condition (1), spherical aberration, astigmatism and the like are generated. 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。 When the lower limit of the conditional expression (1), the back focus, angle, it is difficult to balance the brightness or the like.
条件式(1)を、1.03 ≦ BFw/(Fnow*Fw) ≦ 1.1 Conditional expression (1), 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。 When, it is possible to make the effect of the present invention more reliably ones.

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。 Condition (2) defines the ratio of the focal length of the second group and the third group of synthetic groups focal distance and a wide angle end in the wide-angle end. 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。 If the lower limit of condition (2), second and third lens groups synthesis group power (power = inverse number of focal length) is increased. 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。 As a result, it is difficult to realize the long back focus at the wide-angle end. 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。 If the lower limit of condition (2), further, the spherical aberration, astigmatism and the like are generated.
条件式(2)を、13 ≦ F23w/Fw ≦ 15 Conditional expression (2), 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。 When, it is possible to make the effect of the present invention more reliably ones.

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。 Condition (3) defines the relationship of the second, third, and fourth groups combined focal length and the first lens group at the wide angle end interval of the second lens group at the wide-angle end. 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。 If the lower limit of condition (2), spherical aberration, coma aberration, etc. are generated.
条件式(3)を、 1.3 ≦ F234w/(D12w) ≦ 1.5 Conditional expression (3), 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。 When, it is possible to make the effect of the present invention more reliably ones.

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。 Condition (4) is a relational expression of the focal length of the entire system second, third and fourth group composite focal length of the group of the first group and the spacing and the wide-angle end of the second group at the wide angle end. 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。 When the lower limit of the conditional expression (4), it is difficult to realize the long back focus of 3.7 times the focal length at the wide angle end. 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。 When the lower limit of the conditional expression (4), further, spherical aberration, coma aberration, etc. are generated.
条件式(4)を、 0.13 ≦ F234w/(D12w*Fw) ≦ 0.15 Conditional expression (4), 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。 When, it is possible to make the effect of the present invention more reliably ones.

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。 Condition (5) defines the ratio of the focal length of the second group and the synthesis unit of the third group at the telephoto end and the wide-angle end. 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。 If the lower limit of condition (5), it becomes difficult to achieve both miniaturization and 2.2 times more zooming. 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。 If the lower limit of condition (5), further, the spherical aberration, astigmatism and the like are generated.
条件式(5)を、 2.0 ≦ |F23w/F23t| ≦ 3.0 The conditional expression (5), 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。 When, it is possible to make the effect of the present invention more reliably ones.

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, in a zoom lens which ensures that more than angle is 105 ° at the wide angle end, it achieves more than twice the zoom ratio, 3.7 times the focal length at the wide angle end back it is possible to construct a wide-angle lens having a focus.

第1実施形態の広角ズームレンズの光学構成図である。 It is an optical diagram of a wide-angle zoom lens of the first embodiment. 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示す収差図である。 Spherical aberration of the wide-angle end of the wide-angle zoom lens of the first embodiment, astigmatism is an aberration diagram showing the distortion and chromatic aberration of magnification. 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示す収差図である。 Spherical aberration at the telephoto end of the wide-angle zoom lens of the first embodiment, astigmatism is an aberration diagram showing the distortion and chromatic aberration of magnification. 第2実施形態の広角ズームレンズの光学構成図である。 It is an optical diagram of a wide-angle zoom lens of the second embodiment. 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示す収差図である。 Spherical aberration of the wide-angle end of the wide-angle zoom lens of the second embodiment, astigmatism is an aberration diagram showing the distortion and chromatic aberration of magnification. 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示す収差図である。 Spherical aberration at the telephoto end of the wide-angle zoom lens of the second embodiment, astigmatism is an aberration diagram showing the distortion and chromatic aberration of magnification. 第3実施形態の広角ズームレンズの光学構成図である。 It is an optical diagram of a wide-angle zoom lens of the third embodiment. 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示す収差図である。 Spherical aberration of the wide-angle end of the wide-angle zoom lens of the third embodiment, astigmatism is an aberration diagram showing the distortion and chromatic aberration of magnification. 第3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示す収差図である。 Spherical aberration at the telephoto end of the wide-angle zoom lens of the third embodiment, astigmatism is an aberration diagram showing the distortion and chromatic aberration of magnification. 第4実施形態の広角ズームレンズの光学構成図である。 It is an optical diagram of a wide-angle zoom lens in the fourth embodiment. 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示す収差図である。 Spherical aberration of the wide-angle end of the wide-angle zoom lens in the fourth embodiment, astigmatism is an aberration diagram showing the distortion and chromatic aberration of magnification. 第4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示す収差図である。 Spherical aberration at the telephoto end of the wide-angle zoom lens in the fourth embodiment, astigmatism is an aberration diagram showing the distortion and chromatic aberration of magnification.

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。 Hereinafter, an embodiment and the aberration condition of the wide-angle zoom lens of the present invention.
(第1実施形態) (First Embodiment)
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。 Wide-angle zoom lens according to the first embodiment has a structure shown in FIG. 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。 Radius of curvature R (mm), an air spacing D of each lens center thickness and lens (mm), the value of the refractive index Nd and the Abbe number ABV at the d-line of each lens is as follows.

焦点距離:10.29〜15.5952〜23.3915 Focal length: 10.29~15.5952~23.3915
FNO:3.6〜4.15〜4.6 FNO: 3.6~4.15~4.6
2ω:111.4〜85.4〜62.6 2ω: 111.4~85.4~62.6

SRD Nd ABV SRD Nd ABV
1 ASPH 90.9531 3.0000 1.74690 49.22 1 ASPH 90.9531 3.0000 1.74690 49.22
2 ASPH 13.3000 17.4155 2 ASPH 13.3000 17.4155
3 -347.3422 1.1000 1.83944 42.72 3 -347.3422 1.1000 1.83944 42.72
4 27.7720 0.2500 1.51700 49.96 4 27.7720 0.2500 1.51700 49.96
5 ASPH 32.9778 0.8225 5 ASPH 32.9778 0.8225
6 20.1105 4.8835 1.70444 30.05 6 20.1105 4.8835 1.70444 30.05
7 45.1356 D7 7 45.1356 D7
絞り 0.0000 1.6767 Iris 0.0000 1.6767
9 -70.4744 2.4522 1.69416 31.16 9 -70.4744 2.4522 1.69416 31.16
10 -14.1708 0.8000 1.88815 40.80 10 -14.1708 0.8000 1.88815 40.80
11 -37.7808 0.1500 11 -37.7808 0.1500
12 33.1737 3.7557 1.59142 61.25 12 33.1737 3.7557 1.59142 61.25
13 -14.2611 0.8000 1.81184 33.27 13 -14.2611 0.8000 1.81184 33.27
14 -28.6675 D14 14 -28.6675 D14
15 -29.8948 0.8000 1.80831 46.50 15 -29.8948 0.8000 1.80831 46.50
16 23.7239 2.5836 1.93325 20.88 16 23.7239 2.5836 1.93325 20.88
17 240.6296 D17 17 240.6296 D17
18 40.3874 4.8044 1.49845 81.61 18 40.3874 4.8044 1.49845 81.61
19 -35.6422 0.1500 19 -35.6422 0.1500
20 49.4590 0.8000 1.91048 31.31 20 49.4590 0.8000 1.91048 31.31
21 17.3129 11.6398 1.49845 81.61 21 17.3129 11.6398 1.49845 81.61
22 -14.5130 0.8000 1.91048 31.31 22 -14.5130 0.8000 1.91048 31.31
23 -20.5428 0.2000 23 -20.5428 0.2000
24 ASPH -34.8009 0.2000 1.51700 49.96 24 ASPH -34.8009 0.2000 1.51700 49.96
25 -31.4677 1.3000 1.83930 37.34 25 -31.4677 1.3000 1.83930 37.34
26 -38.5550 26 -38.5550

焦点距離:10.2935 15.5952 23.3915 Focal Length: 10.2935 15.5952 23.3915
可変間隔 Variable interval
D7 21.974 11.228 4.641 D7 21.974 11.228 4.641
D14 1.000 7.723 14.519 D14 1.000 7.723 14.519
D17 10.742 5.812 0.900 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。 ASPH represents an aspherical surface is expressed by the following equation (Equation 1).
(式1) (Equation 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 z: depth of aspheric surface y: Height R: paraxial radius of curvature K, A, B, C, D: aspheric coefficient

非球面係数 面1 Aspherical coefficient surface 1
K : -21.703831 K: -21.703831
A :0.137414E-04 B :-.284986E-07 C :0.473022E-10 D :-.418229E-13 A: 0.137414E-04 B: -. 284986E-07 C: 0.473022E-10 D: -. 418229E-13
E :0.157785E-16 E: 0.157785E-16
面2 Surface 2
K : -0.864034 K: -0.864034
A :0.743621E-06 B :0.628016E-07 C :-.187456E-09 D :0.315824E-12 A: 0.743621E-06 B: 0.628016E-07 C: -. 187456E-09 D: 0.315824E-12
E :0.773230E-15 E: 0.773230E-15
面5 Surface 5
K : 1.512115 K: 1.512115
A :0.292118E-04 B :-.127860E-06 C :0.842074E-09 D :-.326732E-11 A: 0.292118E-04 B: -. 127860E-06 C: 0.842074E-09 D: -. 326732E-11
E :0.634290E-14 E: 0.634290E-14
面24 Surface 24
K : -0.150085 K: -0.150085
A :-.101962E-04 B :0.106224E-07 C :0.235188E-10 D :0.177170E-12 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。 Focal length of each lens in the wide-angle zoom lens of the first embodiment is as follows.
群の焦点距離 第1群: -15.253 Focal length first group of the group: -15.253
第2群: 32.183 The second group: 32.183
第3群: -38.7101 Third group: -38.7101
第4群: 32.558 Fourth group: 32.558
Gr1a: -21.94 Gr1a: -21.94
Gr1b: -104.94 Gr1b: -104.94

広角端で 第2,3群合成焦点距離: 148.639 Second and third group combined focal length at the wide angle end: 148.639
第2,3,4群合成焦点距離:31.483 Second, third and fourth group combined focal length: 31.483
第1,2,3群合成群焦点距離:-23.355 First, second, and third group combining unit focal length: -23.355
第1,2,3群合成群と4群の主点位置間間隔:83.074 Principal point spacing of the first, second, and third group combining group and 4 groups: 83.074
レンズ全長:94.1 Overall length of the lens: 94.1
望遠端で 第2、3群の合成焦点距離:56.887 Composite focal length of the second and third group at the 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。 The shape of the eleventh surface of the wide-angle zoom lens of the first embodiment is as follows.
有効径 法線角度 The 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。 The value of the conditional expression of a wide-angle zoom lens of the first embodiment is as follows.
条件式(1) BFw/(Fnow*Fw) =1.05 Conditional expressions (1) BFw / (Fnow * Fw) = 1.05
条件式(2) F23w/Fw=14.44 Conditional expression (2) F23w / Fw = 14.44
条件式(3) F234w/(D12w) =1.433 The conditional expression (3) F234w / (D12w) = 1.433
条件式(4) F234w/(D12w*Fw)=0.139 Conditional expression (4) F234w / (D12w * Fw) = 0.139
条件式(5) F23w/F23t=2.613 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。 Spherical aberration of the wide-angle end of the wide-angle zoom lens of the first embodiment, astigmatism, distortion and lateral chromatic aberration shown to FIG. 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。 Spherical aberration at the telephoto end of the wide-angle zoom lens of the first embodiment, astigmatism, distortion and lateral chromatic aberration shown to FIG.

(第2実施形態) (Second Embodiment)
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。 Wide-angle zoom lens of the second embodiment has a structure shown in FIG. 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。 Radius of curvature R (mm), an air spacing D of each lens center thickness and lens (mm), at the d-line of each lens, the refractive index Nd and the Abbe number ABV is as follows.

焦点距離:10.29〜15.60〜23.39 Focal length: 10.29~15.60~23.39
FNO:3.6〜4.15〜4.6 FNO: 3.6~4.15~4.6
2ω:111.36〜85.71〜62.88 2ω: 111.36~85.71~62.88

SRD Nd ABV SRD Nd ABV
1 ASPH 98.2835 3.0000 1.74330 49.22 1 ASPH 98.2835 3.0000 1.74330 49.22
2 ASPH 13.3000 17.0621 2 ASPH 13.3000 17.0621
3 -375.8017 1.1000 1.83481 42.72 3 -375.8017 1.1000 1.83481 42.72
4 26.2992 0.2500 1.51460 49.96 4 26.2992 0.2500 1.51460 49.96
5 ASPH 31.3128 0.8586 5 ASPH 31.3128 0.8586
6 19.4744 4.2180 1.69895 30.05 6 19.4744 4.2180 1.69895 30.05
7 44.8215 D7 7 44.8215 D7
8 0.0000 1.6811 8 0.0000 1.6811
9 -69.6742 2.4945 1.68893 31.16 9 -69.6742 2.4945 1.68893 31.16
10 -13.8558 0.8000 1.88300 40.80 10 -13.8558 0.8000 1.88300 40.80
11 -37.5514 0.1500 11 -37.5514 0.1500
12 33.6029 3.7863 1.58913 61.25 12 33.6029 3.7863 1.58913 61.25
13 -14.1772 0.8000 1.80610 33.27 13 -14.1772 0.8000 1.80610 33.27
14 -28.4616 D14 14 -28.4616 D14
15 -31.0253 0.8000 1.80420 46.50 15 -31.0253 0.8000 1.80420 46.50
16 23.9527 2.5703 1.92286 20.88 16 23.9527 2.5703 1.92286 20.88
17 237.9034 D17 17 237.9034 D17
18 41.0664 4.5125 1.49700 81.61 18 41.0664 4.5125 1.49700 81.61
19 -35.8367 0.1500 19 -35.8367 0.1500
20 49.9837 0.9000 1.90366 31.31 20 49.9837 0.9000 1.90366 31.31
21 17.1665 11.7603 1.49700 81.61 21 17.1665 11.7603 1.49700 81.61
22 -14.5000 1.1000 1.90366 31.31 22 -14.5000 1.1000 1.90366 31.31
23 -21.0822 0.2000 23 -21.0822 0.2000
24 ASPH -50.4122 0.2000 1.51460 49.96 24 ASPH -50.4122 0.2000 1.51460 49.96
25 -44.1195 1.8000 1.83400 37.34 25 -44.1195 1.8000 1.83400 37.34
26 -53.8351 26 -53.8351

焦点距離:10.29 15.60 23.40 Focal length: 10.29 15.60 23.40
可変間隔 Variable interval
D7 22.0922 11.2672 4.7266 D7 22.0922 11.2672 4.7266
D14 0.9588 7.5245 14.2504 D14 0.9588 7.5245 14.2504
D17 10.8553 5.8392 0.800 D17 10.8553 5.8392 0.800

非球面係数 面1 Aspherical coefficient surface 1
K : -30.868200 K: -30.868200
A :0.147706E-04 B :-.260370E-07 C :0.377473E-10 D :-.300023E-13 A: 0.147706E-04 B: -. 260370E-07 C: 0.377473E-10 D: -. 300023E-13
E :0.107463E-16 E: 0.107463E-16
面2 Surface 2
K : -1.240297 K: -1.240297
A :0.207897E-04 B :0.298769E-07 C :0.267684E-09 D :-.163367E-11 A: 0.207897E-04 B: 0.298769E-07 C: 0.267684E-09 D: -. 163367E-11
E :0.372598E-14 E: 0.372598E-14
面5 Surface 5
K : 2.187192 K: 2.187192
A :0.313924E-04 B :-.202309E-06 C :0.158321E-08 D :-.733956E-11 A: 0.313924E-04 B: -. 202309E-06 C: 0.158321E-08 D: -. 733956E-11
E :0.139279E-13 E: 0.139279E-13
面24 Surface 24
K : -0.780042 K: -0.780042
A :-.942956E-05 B :0.141825E-07 C :0.244817E-10 D :0.194500E-12 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。 Focal length of each lens in the wide-angle zoom lens of the second embodiment is as follows.
群の焦点距離 第1群: -15.085 Focal length first group of the group: -15.085
第2群: 32.5574 The second group: 32.5574
第3群: -40.0929 Third group: -40.0929
第4群: 33.0051 Fourth group: 33.0051
Gr1a: -21.0097 Gr1a: -21.0097
Gr1b: -102.427 Gr1b: -102.427

広角端で 第2,3群合成焦点距離: 140.206 Second and third group combined focal length at the wide angle end: 140.206
第2,3,4群合成焦点距離:31.626 Second, third and fourth group combined focal length: 31.626
第1,2,3群合成群焦点距離:-24.033 First, second, and third group combining unit focal length: -24.033
第1,2,3群合成群と4群の主点位置間間隔:86.032 Principal point spacing of the first, second, and third group combining group and 4 groups: 86.032
レンズ全長:94.1 Overall length of the lens: 94.1
望遠端で 第2、3群の合成焦点距離:57.754 Composite focal length of the second and third group 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。 The shape of the eleventh surface of the wide-angle zoom lens of the second embodiment is as follows.
有効径 法線角度 The 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。 The value of the conditional expression of a wide-angle zoom lens of the second embodiment is as follows.
条件式(1) BFw/(Fnow*Fw) =1.05 Conditional expressions (1) BFw / (Fnow * Fw) = 1.05
条件式(2) F23w/Fw=13.621 Conditional expression (2) F23w / Fw = 13.621
条件式(3) F234w/(D12w) =1.432 The conditional expression (3) F234w / (D12w) = 1.432
条件式(4) F234w/(D12w*Fw)=0.139 Conditional expression (4) F234w / (D12w * Fw) = 0.139
条件式(5) F23w/F23t=2.428 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。 Spherical aberration of the wide-angle end of the wide-angle zoom lens of the second embodiment, astigmatism, distortion and lateral chromatic aberration shown to FIG. 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。 Spherical aberration at the telephoto end of the wide-angle zoom lens of the second embodiment, astigmatism, distortion and lateral chromatic aberration shown to FIG.

(第3実施形態) (Third Embodiment)
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。 Wide-angle zoom lens according to the first embodiment has a structure shown in FIG. 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。 Radius of curvature R (mm), an air spacing D of each lens center thickness and lens (mm), the value of the refractive index Nd and the Abbe number ABV at the d-line of each lens is as follows.

焦点距離:10.29〜15.60〜23.39 Focal length: 10.29~15.60~23.39
FNO:3.6〜4.15〜4.6 FNO: 3.6~4.15~4.6
2ω:111.38〜85.4〜62.63 2ω: 111.38~85.4~62.63
SRD Nd ABV SRD Nd ABV
1 ASPH 91.2892 3.0000 1.74330 49.22 1 ASPH 91.2892 3.0000 1.74330 49.22
2 ASPH 13.3000 17.1746 2 ASPH 13.3000 17.1746
3 -550.1946 1.1000 1.83481 42.72 3 -550.1946 1.1000 1.83481 42.72
4 26.8414 0.2500 1.51460 49.96 4 26.8414 0.2500 1.51460 49.96
5 ASPH 31.7796 0.8380 5 ASPH 31.7796 0.8380
6 19.6685 4.8948 1.69895 30.05 6 19.6685 4.8948 1.69895 30.05
7 43.3886 D7 7 43.3886 D7
8 0.0000 1.6759 8 0.0000 1.6759
9 -70.7449 2.4534 1.68893 31.16 9 -70.7449 2.4534 1.68893 31.16
10 -14.1775 0.8000 1.88300 40.80 10 -14.1775 0.8000 1.88300 40.80
11 -37.9248 0.1500 11 -37.9248 0.1500
12 33.1085 3.7574 1.58913 61.25 12 33.1085 3.7574 1.58913 61.25
13 -14.2673 0.7937 1.80610 33.27 13 -14.2673 0.7937 1.80610 33.27
14 -28.7457 D14 14 -28.7457 D14
15 -29.9856 0.8000 1.80420 46.50 15 -29.9856 0.8000 1.80420 46.50
16 23.8293 2.5887 1.92286 20.88 16 23.8293 2.5887 1.92286 20.88
17 241.4124 D17 17 241.4124 D17
18 40.5319 4.7504 1.49700 81.61 18 40.5319 4.7504 1.49700 81.61
19 -35.4136 0.1500 19 -35.4136 0.1500
20 49.8255 0.9000 1.90366 31.31 20 49.8255 0.9000 1.90366 31.31
21 17.3000 11.4746 1.49700 81.61 21 17.3000 11.4746 1.49700 81.61
22 -14.5000 0.9000 1.90366 31.31 22 -14.5000 0.9000 1.90366 31.31
23 -20.5448 0.2000 23 -20.5448 0.2000
24 ASPH -34.3632 0.2000 1.51460 49.96 24 ASPH -34.3632 0.2000 1.51460 49.96
25 -31.0708 1.3000 1.83400 37.34 25 -31.0708 1.3000 1.83400 37.34
26 -37.8865 26 -37.8865

焦点距離:10.29 15.60 23.40 Focal length: 10.29 15.60 23.40
可変間隔 Variable interval
D7 22.252 11.5339 4.8871 D7 22.252 11.5339 4.8871
D14 1.000 7.8478 14.5915 D14 1.000 7.8478 14.5915
D17 10.6954 5.7013 0.800 D17 10.6954 5.7013 0.800

非球面係数 面1 Aspherical coefficient surface 1
K : -23.358778 K: -23.358778
A :0.138306E-04 B :-.284728E-07 C :0.473046E-10 D :-.418342E-13 A: 0.138306E-04 B: -. 284728E-07 C: 0.473046E-10 D: -. 418342E-13
E :0.157340E-16 E: 0.157340E-16
面2 Surface 2
K : -0.865462 K: -0.865462
A :0.617175E-06 B :0.624054E-07 C :-.184300E-09 D :0.328276E-12 A: 0.617175E-06 B: 0.624054E-07 C: -. 184300E-09 D: 0.328276E-12
E :0.773908E-15 E: 0.773908E-15
面5 Surface 5
K : 1.536049 K: 1.536049
A :0.293177E-04 B :-.126814E-06 C :0.844851E-09 D :-.324948E-11 A: 0.293177E-04 B: -. 126814E-06 C: 0.844851E-09 D: -. 324948E-11
E :0.634290E-14 E: 0.634290E-14
面24 Surface 24
K : -0.133768 KC : 100 K: -0.133768 KC: 100
A :-.102523E-04 B :0.105589E-07 C :0.225709E-10 D :0.159981E-12 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。 Focal length of each lens in the wide-angle zoom lens of the third embodiment is as follows.
群の焦点距離 第1群: -15.297 Focal length first group of the group: -15.297
第2群: 32.268 The second group: 32.268
第3群: -38.818 Third group: -38.818
第4群: 32.560 Fourth group: 32.560
Gr1a: -21.294 Gr1a: -21.294
Gr1b: -106.239 Gr1b: -106.239

広角端で 第2,3群合成焦点距離: 148.971 Second and third group combined focal length at the wide angle end: 148.971
第2,3,4群合成焦点距離:31.486 Second, third and fourth group combined focal length: 31.486
第1,2,3群合成群焦点距離:-23.429 First, second, and third group combining unit focal length: -23.429
第1,2,3群合成群と4群の主点位置間間隔:83.241 Principal point spacing of the first, second, and third group combining group and 4 groups: 83.241
レンズ全長:94.0988 Overall length of the lens: 94.0988
望遠端で 第2、3群の合成焦点距離:56.936 Composite focal length of the second and third group at the 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。 The shape of the eleventh surface of the wide-angle zoom lens of the third embodiment is as follows.
有効径 法線角度 The 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。 The value of the conditional expression of a wide-angle zoom lens of the third embodiment is as follows.
条件式(1) BFw/(Fnow*Fw) =1.05 Conditional expressions (1) BFw / (Fnow * Fw) = 1.05
条件式(2) F23w/Fw=14.472 Conditional expression (2) F23w / Fw = 14.472
条件式(3) F234w/(D12w) =1.415 The conditional expression (3) F234w / (D12w) = 1.415
条件式(4) F234w/(D12w*Fw)=0.137 Conditional expression (4) F234w / (D12w * Fw) = 0.137
条件式(5) F23w/F23t=2.616 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。 Spherical aberration of the wide-angle end of the wide-angle zoom lens of the third embodiment, astigmatism, distortion and lateral chromatic aberration shown to FIG. 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。 Spherical aberration at the telephoto end of the wide-angle zoom lens of the first embodiment, astigmatism, distortion and lateral chromatic aberration shown Figure 9.

(第4実施形態) (Fourth Embodiment)
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。 Wide-angle zoom lens according to the fourth embodiment has a structure shown in FIG. 10. 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。 Radius of curvature R (mm), an air spacing D of each lens center thickness and lens (mm), the value of the refractive index Nd and the Abbe number ABV at the d-line of each lens is as follows.

焦点距離:10.295〜15.598〜23.393 Focal length: 10.295~15.598~23.393
FNO:3.6〜4.15〜4.6 FNO: 3.6~4.15~4.6
2ω:111.42〜85.5〜62.84 2ω: 111.42~85.5~62.84

SRD Nd ABV SRD Nd ABV
1 ASPH 72.8710 3.0000 1.74330 49.22 1 ASPH 72.8710 3.0000 1.74330 49.22
2 ASPH 12.9000 16.2015 2 ASPH 12.9000 16.2015
3 770.1839 1.1000 1.88300 40.80 3 770.1839 1.1000 1.88300 40.80
4 26.0522 0.3000 1.53610 41.21 4 26.0522 0.3000 1.53610 41.21
5 ASPH 30.6791 1.1966 5 ASPH 30.6791 1.1966
6 20.4544 4.7353 1.69895 30.05 6 20.4544 4.7353 1.69895 30.05
7 43.9685 D7 7 43.9685 D7
8 0.0000 1.5074 8 0.0000 1.5074
9 -68.4574 2.5124 1.68893 31.16 9 -68.4574 2.5124 1.68893 31.16
10 -12.6110 1.7924 1.88300 40.80 10 -12.6110 1.7924 1.88300 40.80
11 -37.3079 0.1500 11 -37.3079 0.1500
12 34.8661 3.7882 1.58913 61.25 12 34.8661 3.7882 1.58913 61.25
13 -13.8945 0.8000 1.80610 33.27 13 -13.8945 0.8000 1.80610 33.27
14 -26.8129 D14 14 -26.8129 D14
15 -30.4122 0.8000 1.77250 49.62 15 -30.4122 0.8000 1.77250 49.62
16 20.1071 2.8524 1.84666 23.78 16 20.1071 2.8524 1.84666 23.78
17 292.4999 D17 17 292.4999 D17
18 45.2832 4.3580 1.49700 81.61 18 45.2832 4.3580 1.49700 81.61
19 -36.2850 0.1500 19 -36.2850 0.1500
20 48.9769 0.9000 1.90366 31.31 20 48.9769 0.9000 1.90366 31.31
21 17.4000 12.2843 1.49700 81.61 21 17.4000 12.2843 1.49700 81.61
22 -14.3000 1.1000 1.90366 31.31 22 -14.3000 1.1000 1.90366 31.31
23 -20.2760 0.2000 23 -20.2760 0.2000
24 ASPH -37.3436 0.3500 1.51460 49.96 24 ASPH -37.3436 0.3500 1.51460 49.96
25 -32.4182 1.5000 1.58144 40.89 25 -32.4182 1.5000 1.58144 40.89
26 -44.7821 26 -44.7821

焦点距離:10.295 15.598 23.393 Focal length: 10.295 15.598 23.393
可変間隔 Variable interval
D7 21.1006 10.4692 3.7599 D7 21.1006 10.4692 3.7599
D14 0.8270 7.7520 14.2056 D14 0.8270 7.7520 14.2056
D17 11.0939 5.8381 0.800 D17 11.0939 5.8381 0.800

非球面係数 面1 Aspherical coefficient surface 1
K : -4.855874 K: -4.855874
A :0.147578E-04 B :-.354016E-07 C :0.454072E-10 D :-.116025E-13 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 E: 0.227158E-16 F: -. 308920E-19 G: -. 677424E-22 H: -. 335578E-25
J :0.137873E-27 J: 0.137873E-27
面2 Surface 2
K : -1.110553 K: -1.110553
A :0.277891E-04 B :0.404370E-07 C :0.612679E-10 D :0.362235E-12 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 E: -. 110342E-13 F: 0.528104E-17 G: 0.320816E-18 H: 0.145731E-21
J :-.347259E-23 J: -. 347259E-23
面5 Surface 5
K : 0.335030 K: 0.335030
A :0.226449E-04 B :-.966072E-07 C :0.176373E-09 D :0.114032E-12 A: 0.226449E-04 B: -. 966072E-07 C: 0.176373E-09 D: 0.114032E-12
E :0.138279E-14 E: 0.138279E-14
面24 Surface 24
K : -0.608663 K: -0.608663
A :-.983362E-05 B :0.214587E-07 C :-.114789E-09 D :0.130510E-11 A: -. 983362E-05 B: 0.214587E-07 C: -. 114789E-09 D: 0.130510E-11
E :-.267583E-14 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。 Focal length of each lens in the wide-angle zoom lens of the fourth embodiment is as follows.
群の焦点距離 第1群: -15.199 Focal length first group of the group: -15.199
第2群: 32.3369 The second group: 32.3369
第3群: -40.4942 Third group: -40.4942
第4群: 33.2409 Fourth group: 33.2409
Gr1a: -21.5478 Gr1a: -21.5478
Gr1b: -95.6574 Gr1b: -95.6574

広角端で 第2,3群合成焦点距離: 143.052 Second and third group combined focal length at the wide angle end: 143.052
第2,3,4群合成焦点距離:31.312 Second, third and fourth group combined focal length: 31.312
第1,2,3群合成群焦点距離:-24.561 First, second, and third group combining unit focal length: -24.561
第1,2,3群合成群と4群の主点位置間間隔:87.987 Principal point spacing of the first, second, and third group combining group and 4 groups: 87.987
レンズ全長:94.6 Overall length of the lens: 94.6
望遠端で 第2、3群の合成焦点距離:58.115 Composite focal length of the second and third group at the telephoto end: 58.115

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。 The shape of the eleventh surface of the wide-angle zoom lens in the fourth embodiment is as follows.
有効径 法線角度 The 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。 The value of the conditional expression of a wide-angle zoom lens in the fourth embodiment is as follows.
条件式(1) BFw/(Fnow*Fw) =1.05 Conditional expressions (1) BFw / (Fnow * Fw) = 1.05
条件式(2) F23w/Fw=13.895 Conditional expression (2) F23w / Fw = 13.895
条件式(3) F234w/(D12w) =1.484 The conditional expression (3) F234w / (D12w) = 1.484
条件式(4) F234w/(D12w*Fw)=0.144 Conditional expression (4) F234w / (D12w * Fw) = 0.144
条件式(5) F3w/F23t=2.462 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。 Spherical aberration of the wide-angle end of the wide-angle zoom lens in the fourth embodiment, astigmatism, distortion and lateral chromatic aberration shown to FIG. 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。 Spherical aberration at the telephoto end of the wide-angle zoom lens of the first embodiment, astigmatism, distortion and lateral chromatic aberration shown to FIG.

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。 The value of the conditional expression of the first embodiment of Patent Document 1 is as follows.
条件式(1) BFw/(Fnow*Fw) =0.865 Conditional expressions (1) BFw / (Fnow * Fw) = 0.865
条件式(2) F23w/Fw=6.528 Conditional expression (2) F23w / Fw = 6.528
条件式(3) F234w/(D12w) =1.135 The conditional expression (3) F234w / (D12w) = 1.135
条件式(4) F234w/(D12w*Fw)=0.110 Conditional expression (4) F234w / (D12w * Fw) = 0.110
条件式(5) F23w/F23t=1.392 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。 The value of the conditional expression of a second embodiment of Patent Document 1 is as follows.
条件式(1) BFw/(Fnow*Fw) =1.013 Conditional expressions (1) BFw / (Fnow * Fw) = 1.013
条件式(2) F23w/Fw=7.651 Conditional expression (2) F23w / Fw = 7.651
条件式(3) F234w/(D12w) =1.316 The conditional expression (3) F234w / (D12w) = 1.316
条件式(4) F234w/(D12w*Fw)=0.128 Conditional expression (4) F234w / (D12w * Fw) = 0.128
条件式(5) F23w/F23t=1.340 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。 The value of the conditional expression of the third embodiment of Patent Document 1 is as follows.
条件式(1) BFw/(Fnow*Fw) =0.867 Conditional expressions (1) BFw / (Fnow * Fw) = 0.867
条件式(2) F23w/Fw=9.655 Conditional expression (2) F23w / Fw = 9.655
条件式(3) F234w/(D12w) =1.231 The conditional expression (3) F234w / (D12w) = 1.231
条件式(4) F234w/(D12w*Fw)=0.120 Conditional expression (4) F234w / (D12w * Fw) = 0.120
条件式(5) F23w/F23t=1.284 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。 The value of the conditional expression in the fourth embodiment of Patent Document 1 is as follows.
条件式(1) BFw/(Fnow*Fw) =1.013 Conditional expressions (1) BFw / (Fnow * Fw) = 1.013
条件式(2) F23w/Fw=9.074 Conditional expression (2) F23w / Fw = 9.074
条件式(3) F234w/(D12w) =1.189 The conditional expression (3) F234w / (D12w) = 1.189
条件式(4) F234w/(D12w*Fw)=0.115 Conditional expression (4) F234w / (D12w * Fw) = 0.115
条件式(5) F23w/F23t=1.327 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。 The value of the conditional expression of the fifth embodiment of Patent Document 1 is as follows.
条件式(1) BFw/(Fnow*Fw) =0.978 Conditional expressions (1) BFw / (Fnow * Fw) = 0.978
条件式(2) F23w/Fw=9.641 Conditional expression (2) F23w / Fw = 9.641
条件式(3) F234w/(D12w) =1.227 The conditional expression (3) F234w / (D12w) = 1.227
条件式(4) F234w/(D12w*Fw)=0.119 Conditional expression (4) F234w / (D12w * Fw) = 0.119
条件式(5) F23w/F23t=1.457 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。 The value of the conditional expression of the sixth embodiment of Patent Document 1 is as follows.
条件式(1) BFw/(Fnow*Fw) =1.015 Conditional expressions (1) BFw / (Fnow * Fw) = 1.015
条件式(2) F23w/Fw=9.764 Conditional expression (2) F23w / Fw = 9.764
条件式(3) F234w/(D12w) =1.190 The conditional expression (3) F234w / (D12w) = 1.190
条件式(4) F234w/(D12w*Fw)=0.116 Conditional expression (4) F234w / (D12w * Fw) = 0.116
条件式(5) F23w/F23t=1.427 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 rear group of the front group Gr1B first lens group of the first lens group

Claims (8)

  1. 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。 In order from an object, a first lens unit having a negative refractive power, a second lens unit having positive refractive power, a third lens unit having a negative refractive power, a fourth lens unit having positive refractive power, the lens groups the move perform zooming, wide-angle zoom lens focal length synthesis group spacing and the focal length and the group of each group between groups satisfies the following conditional expression.
    条件式(1)1.03 ≦ BFw/(Fnow*Fw) ≦ 1.2 Conditional expressions (1) 1.03 ≦ BFw / (Fnow * Fw) ≦ 1.2
    但し、 However,
    BFw :バックフォーカス BFw: back focus
    Fnow:広角端でのFナンバー Fnow: F-number at the wide-angle end
    Fw :広角端での光学全系の焦点距離 Fw: focal length of the overall optical system at the wide-angle end
  2. 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。 In order from an object, a first lens unit having a negative refractive power, a second lens unit having positive refractive power, a third lens unit having a negative refractive power, a fourth lens unit having positive refractive power, the lens groups the move perform zooming, wide-angle zoom lens focal length synthesis group spacing and the focal length and the group of each group between groups satisfies the following conditional expression.
    条件式(2)F23w/Fw ≧ 12 Conditional expression (2) F23w / Fw ≧ 12
    但し、 However,
    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 F23w: second lens unit at the wide angle end and the composite focal length of the third lens group
    Fw :広角端での光学全系の焦点距離 Fw: focal length of the overall optical system at the wide-angle end
  3. 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。 In order from an object, a first lens unit having a negative refractive power, a second lens unit having positive refractive power, a third lens unit having a negative refractive power, a fourth lens unit having positive refractive power, the lens groups the move perform zooming, wide-angle zoom lens focal length synthesis group spacing and the focal length and the group of each group between groups satisfies the following conditional expression.
    条件式(3)F234w/(D_12w) ≧ 1.3 The conditional expression (3) F234w / (D_12w) ≧ 1.3
    但し、 However,
    F234w:広角端での第2、3、4群の合成焦点距離 F234w: composite focal length of the second, third, and fourth groups at the wide-angle end
    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 D12w: infinity first lens unit at the wide angle end in the interval between the second lens group
  4. さらに、条件式(2)を満たすことを特徴とする請求項1に記載の広角ズームレンズ。 Further, wide-angle zoom lens according to claim 1, characterized by satisfying the conditional expression (2).
  5. さらに、条件式(3)を満たすことを特徴とする請求項1又は2に記載の広角ズームレンズ。 Further, wide-angle zoom lens according to claim 1 or 2, characterized by satisfying the conditional expression (3).
  6. さらに、条件式(4)F234w/(D12w*Fw) ≧ 0.13 In addition, the conditional expression (4) F234w / (D12w * Fw) ≧ 0.13
    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。 Claims 1 and satisfies the to wide-angle zoom lens according to any one of 5.
    但し、 However,
    F234w:広角端での第2、3、4群の合成焦点距離 F234w: composite focal length of the second, third, and fourth groups at the wide-angle end
    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 D12w: infinity first lens unit at the wide angle end in the interval between the second lens group
    Fw :広角端で光学全系の焦点距離 Fw: focal length of an overall optical system at the wide angle end
  7. さらに、条件式(5) |F23w/F23t| ≧ 2.0 In addition, the conditional expression (5) | F23w / F23t | ≧ 2.0
    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。 Claims 1 and satisfies the to wide-angle zoom lens according to any one of 6.
    但し、 However,
    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 F23w: the second lens group at the wide angle end and the composite focal length of the third lens group
    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 F23t: the second lens group at the telephoto end and the composite focal length of the third lens group
  8. 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請求項1ないし7のいずれか一項に記載の広角ズームレンズ。 The first lens unit having a negative refractive power consists of the group lens group of the first lens group of negative front lens group of the first lens group refractive power and the negative refractive power, from an infinity object to a close wide-angle zoom lens according to any one of claims 1 to 7 for focusing, characterized in that moving the group rear lens group of the first lens group toward the object side.
JP2009097399A 2009-04-13 2009-04-13 Wide-angle zoom lens Pending JP2010249958A (en)

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JP2009097399A JP2010249958A (en) 2009-04-13 2009-04-13 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
CN201410031012.0A CN103744171B (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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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000221403A (en) * 1999-02-03 2000-08-11 Minolta Co Ltd Lens optical system
JP2001215410A (en) * 2000-01-28 2001-08-10 Nikon Corp Zoom lens and projection type display device provided with the same
JP2002244044A (en) * 2001-02-19 2002-08-28 Canon Inc Zoom lens and optical instrument using it
JP2004240038A (en) * 2003-02-04 2004-08-26 Canon Inc Zoom lens
JP2005049843A (en) * 2003-07-17 2005-02-24 Nikon Corp Zoom lens
JP2005107036A (en) * 2003-09-29 2005-04-21 Nikon Corp Zoom lens
JP2005157097A (en) * 2003-11-27 2005-06-16 Olympus Corp Zoom lens and imaging apparatus equipped with same
JP2006039531A (en) * 2004-06-25 2006-02-09 Canon Inc Zoom lens and imaging apparatus equipped with the same
JP2010060612A (en) * 2008-09-01 2010-03-18 Canon Inc Zoom lens and image pickup device including the same

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000221403A (en) * 1999-02-03 2000-08-11 Minolta Co Ltd Lens optical system
JP2001215410A (en) * 2000-01-28 2001-08-10 Nikon Corp Zoom lens and projection type display device provided with the same
JP2002244044A (en) * 2001-02-19 2002-08-28 Canon Inc Zoom lens and optical instrument using it
JP2004240038A (en) * 2003-02-04 2004-08-26 Canon Inc Zoom lens
JP2005049843A (en) * 2003-07-17 2005-02-24 Nikon Corp Zoom lens
JP2005107036A (en) * 2003-09-29 2005-04-21 Nikon Corp Zoom lens
JP2005157097A (en) * 2003-11-27 2005-06-16 Olympus Corp Zoom lens and imaging apparatus equipped with same
JP2006039531A (en) * 2004-06-25 2006-02-09 Canon Inc Zoom lens and imaging apparatus equipped with the same
JP2010060612A (en) * 2008-09-01 2010-03-18 Canon Inc Zoom lens and image pickup device including the same

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