JP2000162501A - Zoom lens - Google Patents
Zoom lensInfo
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- JP2000162501A JP2000162501A JP10333706A JP33370698A JP2000162501A JP 2000162501 A JP2000162501 A JP 2000162501A JP 10333706 A JP10333706 A JP 10333706A JP 33370698 A JP33370698 A JP 33370698A JP 2000162501 A JP2000162501 A JP 2000162501A
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- Prior art keywords
- group
- lens
- refractive power
- zoom lens
- telephoto
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Abstract
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、高倍率望遠ズームレン
ズに関し、さらに詳しくは、３５mmフィルム用の写真用
カメラやビデオカメラ、電子スチルカメラ、そして放送
用カメラ等に用いる望遠用ズームレンズにおいて、広角
端の焦点距離が約１００mmで、ズーム比が約５倍である
にものかかわらず、テレ比が0.７５以内のコンパクト性
をもったズームレンズに関する。
【０００２】
【従来技術】従来より３５mm一眼フレックスカメラ等に
使用される望遠ズームレンズでは、物体側より順に変倍
中固定の正の屈折力を持つ第１群、負の屈折力を持つ変
倍レンズ群である第２群、正の屈折力を持つ補正レンズ
群である第３群、および正の屈折力を持つリレーレンズ
群からなる第４群からなる４群構成のズームレンズ群が
実用化されている。レンズ全長を小さくするために、多
群で構成された多群移動方式のズームレンズ群も実用化
されている。
【０００３】
【発明が解決しようとする課題】上述した前者のズーム
レンズにおいては、ズーム比を大きくすると、変倍作用
を持つ第２群の移動量が増加するため、レンズ全長は大
きくなってしまい、テレ比も小さくすることができな
い。変倍中の移動量を減少させるために第２群の屈折力
を強くすると、変倍により収差の変動が大きくなり、収
差の補正が困難となる。上述した後者のズームレンズに
おいては、広角端の焦点距離が約１００mm、ズーム比が
約５倍の高倍率のものは実用化されていない。
【０００４】
【発明の目的】本発明の目的は、広角端の焦点距離が約
１００mm、ズーム比が約５倍の高倍率ズームレンズにも
かかわらず、テレ比0.７５以内のコンパス性を持ち、レ
ンズ径の拡大化を招くことなしに十分な周辺光量を確保
でき、ズーミングの全域にわたり高い光学性能を有する
遠望のズームレンズを提供することを目的にする。
【０００５】
【課題を解決するための手段】本発明は、物体側から順
に正の屈折力を持つ第１レンズ群Ｌ１、負の屈折力を持
つ第２群Ｌ２、負の屈折力を持つ第３群Ｌ３、正の屈折
力を持つ第４群Ｌ４、絞りで構成される第５群Ｌ５、正
の屈折力を持つ第６群Ｌ６、負の屈折力を持つ第７群Ｌ
７を有し、第１群、第２群、第４群、第５群、第６群を
物体側へ移動させて広角端から望遠端へ変倍を行い、変
倍に伴う像面移動を第７群を移動させて行う望遠ズーム
レンズにおいて、第１群の焦点距離をｆ1 、全系の望遠
端における焦点距離をｆT とした時、
0.４＜ｆ1 ／ｆT ＜0.６ (1)
第１群の移動量をｍ、第４群の移動量をｍ4 とした時、
0.４＜ｍ4 ／ｍ1 ＜0.７ (2)
第５群の移動量をｍ5 とした時
0.５＜ｍ5 ／ｍ4 ＜1.０ (3)
であることを特徴とするコンパクトズームレンズであ
る。
【０００６】
【作用】第１群の焦点距離をｆ1 、全系の望遠端におけ
る焦点距離をｆT とした時、
0.４＜ｆ1 ／ｆT ＜0.６ (1)
とすることにより、望遠ズームレンズをテレ比0.７５以
内にコンパクトに構成し、第１レンズ群の屈折力を適切
に設定することができる。条件式(1) の下限を越える
と、第１レンズ群の屈折力が強くなるため、ズーミング
による移動量は小さくできるが第１レンズ群で発生する
球面収差が大きくなり、第１レンズ群より像面側のレン
ズ群での補正が困難となる。逆に(1) 式の上限をはずれ
ると、第１レンズ群の屈折力が弱くなるためにズーミン
グによる移動量が大きくなり、コンパクト化が困難にな
る。
【０００７】第１群の移動量をｍ、第４群の移動量をｍ
4 とした時、
0.４＜ｍ4 ／ｍ1 ＜0.７ (2)
とすることにより、広角端におけるレンズ全長と、望遠
端におけるレンズ全長の変動を規制することができる。
条件式(2) の下限を越えると、第１レンズ群のズーミン
グによる移動量が大きくなるためにコンパクト化が困難
になる。逆に(2)式の上限をはずれると、広角側での球
面収差の補正が困難となる。絞りである第５群の移動量
をｍ5 とした時
0.５＜ｍ5 ／ｍ4 ＜1.０ (3)
とすることにより、レンズ鏡筒径に影響する絞りの径を
適切に決めることができる。条件式(3) の下限を越える
と、絞り径が小さくできるが、広角側のＦナンバーが暗
くなってしまう。逆に条件式(3) の上限を越えると、絞
り径が大きくなり広角側の球面収差の補正が困難とな
る。
【０００８】
【発明の効果】本発明によれば、広角端の焦点距離が約
１００mm、ズーム比が約５倍の高倍率ズームレンズにも
かかわらず、テレ比0.７５以内のコンパス性を持ち、レ
ンズ径の拡大化を招くことなしに十分な周辺光量を確保
でき、ズーミングの全域にわたり高い光学性能を有する
遠望のコンパクトズームレンズを構成することができ
る。
【０００９】
【発明の実施の形態】［第１実施例］第１実施例のコン
パクトズームレンズは、図１及び図２に示すように、
焦点距離 ｆ＝102.0 〜222.7 〜490.0 mm
開口数 Ｆno＝5.01〜6.05〜6.32
バックフォーカス ＢＦ＝４２．５mm
以下に第１実施例の緒元を示す。第１カラムＮＳは物体
側からのレンズ面の番号、第２カラムＲはレンズ曲率半
径(mm)、第３カラムＤは各レンズ面の間隔(mm)、第４カ
ラムＮｄは各レンズのｄ線（λ＝587.6nm)に対する屈折
率、第５カラムνは各レンズのアッベ数を示す。STOPは
絞り、ＦＳはフレア絞りを表わす。
【００１０】
ＮＳ Ｒ Ｄ Ｎｄ ν
1 387.5497 7.0 1.48749 70.21
2 −387.5497 0.2
3 155.6791 8.5 1.49700 81.61
4 −480.7183 2.5
5 −431.3691 4.0 1.83400 37.17
6 389.9144 2.0
7 304.7566 5.0 1.49700 81.61
8 -2501.4226 D(B)
9 -2818.4233 2.0 1.77250 49.60
10 80.2019 5.0 1.71736 29.51
11 224.5318 D(11)
12 − 77.1609 5.0 1.75520 27.51
13 − 43.4425 2.5
14 − 36.7324 2.0 1.77250 49.60
15 −138.4914 D(15)
16 −111.5964 2.5 1.75520 27.51
17 890.6644 2.0
18 133.772 6.0 1.51633 64.15
19 − 44.7196 D(19)
20 STOP D(20)
21 144.8189 6.0 1.51633 64.15
22 − 32.7986 2.0 1.74400 44.79
23 −140.254 0.2
24 60.6175 4.0 1.48749 70.21
25 −469.4821 D(25)
26 79.4164 2.0 1.71300 53.84
27 40.086 2.0
28 868.3316 1.5 1.72000 50.25
29 27.2208 3.5 1.75520 27.51
30 66.2276 D(30)
31 FS
焦点距離 102.0 222.7 490.0
可変間隔
Ｄ(8) 4.749 52.810 93.752
Ｄ(11) 27.941 34.806 40.655
Ｄ(15) 53.360 26.393 2.501
Ｄ(19) 3.228 10.970 18.485
Ｄ(20) 2.842 7.838 13.014
Ｄ(25) 34.533 23.829 2.036
Ｄ(30) 0.390 25.323 58.317
第１実施例の条件式に関する値は、
ｆ1 ／ｆT ＝ 0.45
ｍ4 ／ｍ1 ＝ 0.5
ｍ5 ／ｍ4 ＝ 0.7
である。
【００１１】第１実施例のコンパクトズームレンズの収
差を、図３、図４、図５にグラフで示す。球面収差・正
弦条件グラフにおいて、実線は球面収差を示し、点線は
正弦条件を示す。非点収差グラフにおいて、実線はサジ
タル像面を示し、点線はメリデイオナル像面を示す。各
グラフにおいて、１はｄ線（５８７．５６nm）を示し、
２はｇ線（４３５．８４nm）を示す。図３は、物点が無
限遠である広角端のコンパクトズームレンズの収差図で
ある。図４は、物点が無限遠であるズーム中間状態のコ
ンパクトズームレンズの収差図である。図５は、物点が
無限遠である広角端のコンパクトズームレンズの収差図
である。
【００１２】
【第２実施例】第２実施例のコンパクトズームレンズ
は、図６及び図７に示すように、
焦点距離 ｆ＝102.0 〜222.7 〜490.0 mm
開口数 ＦNo＝4.55〜5.66〜6.30
バックフォーカス ＢＦ＝４２．５mm
以下に第２実施例の緒元を示す。
ＮＳ Ｒ Ｄ Ｎｄ ν
1 393.2283 7.0 1.48749 70.21
2 −393.2283 0.2
3 154.8552 8.5 1.49700 81.61
4 −467.2884 2.5
5 −426.1859 4.0 1.83400 37.17
6 391.0741 2.0
7 304.715 5.0 1.49700 81.61
8 -2413.4558 D(8)
9 -2795.6899 2.0 1.77250 49.60
10 80.2035 5.0 1.71736 29.51
11 224.6892 D(11)
12 − 77.3514 5.0 1.75520 27.51
13 − 43.3449 2.5
14 − 36.6691 2.0 1.77250 49.60
15 −139.2209 D(15)
16 −112.4116 2.5 1.75520 27.51
17 880.8016 2.0
18 134.0859 6.0 1.51633 64.15
19 − 44.8191 D(19)
20 STOP D(20)
21 145.9918 6.0 1.51633 64.15
22 − 32.9411 2.0 1.74400 44.79
23 −140.3313 0.2
24 60.6661 4.0 1.48749 70.21
25 −466.0133 D(25)
26 79.3776 2.0 1.71300 53.84
27 40.0895 2.0
28 859.1386 1.5 1.72000 50.25
29 27.2264 3.5 1.75520 27.51
30 66.1411 D(30)
31 FS
焦点距離 102.0 222.7 490.0
可変間隔
Ｄ(8) 4.804 52.865 93.807
Ｄ(11) 27.903 34.769 40.618
Ｄ(15) 53.423 26.456 2.564
Ｄ(19) 3.196 5.445 8.282
Ｄ(20) 2.831 13.319 23.174
Ｄ(25) 34.542 23.838 2.045
Ｄ(30) 0.394 25.326 58.320
第２実施例の条件式に関する値は、
ｆ1 ／ｆT ＝ 0.45
ｍ4 ／ｍ1 ＝ 0.5
ｍ5 ／ｍ4 ＝ 0.9
である。
【００１３】第２実施例のコンパクトズームレンズの収
差を、図８、図９、図１０のグラフで示す。球面収差・
正弦条件グラフにおいて、実線は球面収差を示し、点線
は正弦条件を示す。非点収差グラフにおいて、実線はサ
ジタル像面を示し、点線はメリデイオナル像面を示す。
各グラフにおいて、１はｄ線（５８７．５６nm）を示
し、２はｇ線（４３５．８４nm）を示す。図８は、物点
が無限遠である広角端のコンパクトズームレンズの収差
図である。図９は、物点が無限遠であるズーム中間状態
のコンパクトズームレンズの収差図である。図１０は、
物点が無限遠である望遠端のコンパクトズームレンズの
収差図である。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-magnification telephoto zoom lens, and more particularly to a photographic camera, video camera, electronic still camera, and broadcast camera for 35 mm film. The present invention relates to a telephoto zoom lens used for a camera or the like, which has a focal length of about 100 mm at a wide-angle end and a compactness of a telephoto ratio of 0.75 or less regardless of a zoom ratio of about 5 times. 2. Description of the Related Art Conventionally, in a telephoto zoom lens used for a 35 mm single-lens flex camera or the like, a first lens unit having a fixed positive refractive power and a variable refractive power having a negative refractive power are fixed in order from the object side during zooming. Practical use of a four-group zoom lens group including a second group as a lens group, a third group as a correction lens group having a positive refractive power, and a fourth group including a relay lens group having a positive refractive power. Have been. In order to reduce the overall length of the lens, a zoom lens group of a multi-group moving system composed of multiple groups has been put to practical use. [0003] In the former zoom lens described above, when the zoom ratio is increased, the moving distance of the second lens unit having a zooming action increases, and the overall length of the lens increases. Also, the telephoto ratio cannot be reduced. If the refractive power of the second lens unit is increased in order to reduce the amount of movement during zooming, the zoom will cause a large variation in aberrations, making it difficult to correct aberrations. In the latter zoom lens described above, a lens having a high magnification with a focal length at the wide angle end of about 100 mm and a zoom ratio of about 5 has not been put to practical use. An object of the present invention is to provide a compass having a telephoto ratio of 0.75 or less despite a high magnification zoom lens having a focal length of about 100 mm at the wide-angle end and a zoom ratio of about 5 times. It is another object of the present invention to provide a long-distance zoom lens that can secure a sufficient amount of peripheral light without increasing the lens diameter and has high optical performance over the entire zooming range. According to the present invention, there is provided a first lens unit L1 having a positive refractive power, a second lens unit L2 having a negative refractive power, and a second lens unit having a negative refractive power. A third unit L3, a fourth unit L4 having a positive refractive power, a fifth unit L5 including a stop, a sixth unit L6 having a positive refractive power, and a seventh unit L having a negative refractive power.
The first, second, fourth, fifth, and sixth units are moved toward the object side to perform zooming from the wide-angle end to the telephoto end, and perform image plane movement accompanying zooming. In a telephoto zoom lens that is moved by moving the seventh unit, when the focal length of the first unit is f 1 and the focal length at the telephoto end of the entire system is f T , 0.4 <f 1 / f T <0. 6 (1) When the moving amount of the first group is m and the moving amount of the fourth group is m 4 , 0.4 <m 4 / m 1 <0.7 (2) The moving amount of the fifth group is m 5 that the the time is 0.5 <m 5 / m 4 < 1.0 (3) is a compact zoom lens according to claim. When the focal length of the first lens unit is f 1 and the focal length at the telephoto end of the entire system is f T , 0.4 <f 1 / f T <0.6 (1) Accordingly, the telephoto zoom lens can be configured to be compact within the telephoto ratio of 0.75, and the refractive power of the first lens group can be set appropriately. If the lower limit of conditional expression (1) is exceeded, the refractive power of the first lens group becomes strong, so that the amount of movement due to zooming can be reduced, but the spherical aberration generated in the first lens group becomes large, and the image quality becomes larger than that of the first lens group. Correction by the lens unit on the surface side becomes difficult. Conversely, if the value is outside the upper limit of the expression (1), the refractive power of the first lens group becomes weak, so that the moving amount by zooming becomes large, and it is difficult to make the zoom lens compact. The amount of movement of the first group is m, and the amount of movement of the fourth group is m
4 and then when he, by a 0.4 <m 4 / m 1 < 0.7 (2), it is possible to regulate the total lens length at the wide angle end, the variation of the total lens length at the telephoto end.
If the lower limit of conditional expression (2) is exceeded, the amount of movement of the first lens unit due to zooming becomes large, making it difficult to make the first lens unit compact. Conversely, if the upper limit of the expression (2) is deviated, it becomes difficult to correct spherical aberration on the wide-angle side. Determining the amount of movement of the fifth group of a diaphragm by 0.5 when the m 5 <m 5 / m 4 <1.0 (3), the diameter of the aperture that affect lens barrel diameter appropriately be able to. If the lower limit of conditional expression (3) is exceeded, the aperture diameter can be reduced, but the F-number on the wide-angle side becomes dark. On the other hand, when the value exceeds the upper limit of the conditional expression (3), the stop diameter becomes large and it becomes difficult to correct spherical aberration on the wide-angle side. According to the present invention, despite having a high magnification zoom lens having a focal length of about 100 mm at the wide angle end and a zoom ratio of about 5 times, it has a compass property within a telephoto ratio of 0.75. In addition, a sufficient peripheral light amount can be secured without increasing the lens diameter, and a long-distance compact zoom lens having high optical performance over the entire zooming range can be configured. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment A compact zoom lens according to a first embodiment has a focal length f = 102.0 to 222.7 to 490.0 mm and a numerical aperture Fno = as shown in FIGS. 5.01 to 6.05 to 6.32 Back focus BF = 42.5 mm The specifications of the first embodiment are shown below. The first column NS is the number of the lens surface from the object side, the second column R is the lens radius of curvature (mm), the third column D is the distance (mm) between the lens surfaces, and the fourth column Nd is the d line of each lens. (Λ = 587.6 nm) and the fifth column ν shows the Abbe number of each lens. STOP indicates a stop and FS indicates a flare stop. NS RD Nd ν 1 387.5497 7.0 1.48749 70.21 2 −387.5497 0.2 3 155.6791 8.5 1.49700 81.61 4 −480.7183 2.5 5 −431.3691 4.0 1.83400 37.17 6 389.9144 2.0 7 304.7566 5.0 1.49700 81.61 8 -2501.4226 D (B) 9 -2818.4233 2.0 1.77250 49.60 10 80.2019 5.0 1.71736 29.51 11 224.5318 D (11) 12 − 77.1609 5.0 1.75520 27.51 13 − 43.4425 2.5 14 − 36.7324 2.0 1.77250 49.60 15 −138.4914 D (15) 16 −111.5964 2.5 1.75520 27.51 17 890.6644 2.0 18 133.772 6.0 1.51633 64.15 19 − 44.7196 D (19) 20 STOP D (20) 21 144.8189 6.0 1.51633 64.15 22 − 32.7986 2.0 1.74400 44.79 23 −140.254 0.2 24 60.6175 4.0 1.48749 70.21 25 −469.4821 D (25) 26 79.4164 2.0 1.71300 53.84 27 40.086 2.0 28 868.3316 1.5 1.72000 50.25 29 27.2208 3.5 1.75520 27.51 30 66.2276 D (30) 31 FS Focal length 102.0 222.7 490.0 Variable spacing D (8) 4.749 52.810 93.752 D (11) 27.941 34.806 40.655 D (15) 53.360 26.393 2.501 D (19) 3.228 10.970 18.485 D (20) 2.842 7.838 13.014 D (25) 34.533 23.829 2.036 D ( 30) 0.390 25.323 58.317 values regarding conditional expressions of the first embodiment is f 1 / f T = 0.45 m 4 / m 1 = 0.5 m 5 / m 4 = 0.7. The aberrations of the compact zoom lens of the first embodiment are shown in graphs in FIGS. 3, 4 and 5. FIG. In the spherical aberration / sine condition graph, a solid line indicates a spherical aberration, and a dotted line indicates a sine condition. In the astigmatism graph, a solid line indicates a sagittal image plane, and a dotted line indicates a meridional image plane. In each graph, 1 indicates a d-line (587.56 nm),
2 indicates a g-line (435.84 nm). FIG. 3 is an aberration diagram of the compact zoom lens at the wide-angle end where the object point is at infinity. FIG. 4 is an aberration diagram of the compact zoom lens in the intermediate zoom state where the object point is at infinity. FIG. 5 is an aberration diagram of the compact zoom lens at the wide-angle end where the object point is at infinity. Second Embodiment A compact zoom lens according to a second embodiment has a focal length f = 102.0 to 222.7 to 490.0 mm and a numerical aperture F No = 4.55 to 5.66 to 6.30 as shown in FIGS. Focus BF = 42.5 mm The specifications of the second embodiment are shown below. NS R D Nd ν 1 393.2283 7.0 1.48749 70.21 2 −393.2283 0.2 3 154.8552 8.5 1.49700 81.61 4 −467.2884 2.5 5 −426.1859 4.0 1.83400 37.17 6 391.0741 2.0 7 304.715 5.0 1.49700 81.61 8 -2413.4558 D (8) 9 -2795.6899 2.0 1.77250 49.60 10 80.2035 5.0 1.71736 29.51 11 224.6892 D (11) 12 − 77.3514 5.0 1.75520 27.51 13 − 43.3449 2.5 14 − 36.6691 2.0 1.77250 49.60 15 −139.2209 D (15) 16 −112.4116 2.5 1.75520 27.51 17 880.8016 2.0 18 134.0859 6.0 1.51633 64.15 19 − 44.8191 D (19) 20 STOP D (20) 21 145.9918 6.0 1.51633 64.15 22 − 32.9411 2.0 1.74400 44.79 23 −140.3313 0.2 24 60.6661 4.0 1.48749 70.21 25 −466.0133 D (25) 26 79.3776 2.0 1.71300 53.84 27 40.0895 2.0 28 859.1386 1.5 1.72000 50.25 29 27.2264 3.5 1.75520 27.51 30 66.1411 D (30) 31 FS Focal length 102.0 222.7 490.0 Variable spacing D (8) 4.804 52.865 93.807 D (11) 27.903 34.769 40.618 D (15) 53.423 26.456 2.564 D (19) 3.196 5.445 8.282 D (20) 2.831 13.319 23.174 D (25) 34.542 23.838 2.045 D (30) 0.394 25.326 5 8.320 values for conditional expressions in the second embodiment is f 1 / f T = 0.45 m 4 / m 1 = 0.5 m 5 / m 4 = 0.9. The aberrations of the compact zoom lens of the second embodiment are shown by graphs in FIGS. 8, 9 and 10. Spherical aberration
In the sine condition graph, a solid line indicates a spherical aberration, and a dotted line indicates a sine condition. In the astigmatism graph, a solid line indicates a sagittal image plane, and a dotted line indicates a meridional image plane.
In each graph, 1 indicates a d-line (587.56 nm), and 2 indicates a g-line (435.84 nm). FIG. 8 is an aberration diagram of the compact zoom lens at the wide-angle end where the object point is at infinity. FIG. 9 is an aberration diagram of the compact zoom lens in the intermediate zoom state where the object point is at infinity. FIG.
FIG. 4 is an aberration diagram of a compact zoom lens at a telephoto end in which an object point is at infinity.
【図面の簡単な説明】
【図１】本発明の第１実施例のコンパクトズームレンズ
の広角端のレンズ断面図である。
【図２】本発明の第１実施例のコンパクトズームレンズ
の望遠端のレンズ断面図である。
【図３】本発明の第１実施例のコンパクトズームレンズ
において物点が無限遠である広角端の収差図である。
【図４】本発明の第１実施例のコンパクトズームレンズ
において物点が無限遠であるズーム中間状態の収差図で
ある。
【図５】本発明の第１実施例のコンパクトズームレンズ
において物点が無限遠である望遠端の収差図である。
【図６】本発明の第２実施例のコンパクトズームレンズ
の広角端のレンズ断面図である。
【図７】本発明の第２実施例のコンパクトズームレンズ
の望遠端のレンズ断面図である。
【図８】本発明の第２実施例のコンパクトズームレンズ
において物点が無限遠である広角端の収差図である。
【図９】本発明の第２実施例のコンパクトズームレンズ
において物点が無限遠であるズーム中間状態の収差図で
ある。
【図１０】本発明の第２実施例のコンパクトズームレン
ズにおいて物点が無限遠である望遠端の収差図である。
【符号の説明】
STOP 絞り
FS フレア絞り
Ｌ１ 第１群レンズ
Ｌ２ 第２群レンズ
Ｌ３ 第３群レンズ
Ｌ４ 第４群レンズ
Ｌ５ 第５群レンズ
Ｌ６ 第６群レンズ
Ｌ７ 第７群レンズBRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a lens cross-sectional view at a wide-angle end of a compact zoom lens according to a first embodiment of the present invention. FIG. 2 is a lens sectional view at a telephoto end of a compact zoom lens according to a first embodiment of the present invention. FIG. 3 is an aberration diagram at a wide-angle end where an object point is at infinity in the compact zoom lens according to the first embodiment of the present invention. FIG. 4 is an aberration diagram of the compact zoom lens according to the first embodiment of the present invention in a zoom intermediate state where the object point is at infinity. FIG. 5 is an aberration diagram at a telephoto end where an object point is at infinity in the compact zoom lens according to the first embodiment of the present invention. FIG. 6 is a sectional view of a compact zoom lens according to a second embodiment of the present invention at the wide-angle end. FIG. 7 is a lens sectional view at a telephoto end of a compact zoom lens according to a second embodiment of the present invention. FIG. 8 is an aberration diagram at a wide-angle end where an object point is at infinity in a compact zoom lens according to a second embodiment of the present invention. FIG. 9 is an aberration diagram of a compact zoom lens according to a second embodiment of the present invention in a zoom intermediate state where the object point is at infinity. FIG. 10 is an aberration diagram at a telephoto end where an object point is at infinity in a compact zoom lens according to a second embodiment of the present invention. [Description of Signs] STOP Stop FS Flare Stop L1 First Group Lens L2 Second Group Lens L3 Third Group Lens L4 Fourth Group Lens L5 Fifth Group Lens L6 Sixth Group Lens L7 Seventh Group Lens
Claims (1)
ンズ群、負の屈折力を持つ第２群、負の屈折力を持つ第
３群、正の屈折力を持つ第４群、絞りで構成される第５
群、正の屈折力を持つ第６群、負の屈折力を持つ第７群
を有し、第１群、第２群、第４群、第５群、第６群を物
体側へ移動させて広角端から望遠端へ変倍を行い、変倍
に伴う像面移動を第７群を移動させて行う望遠ズームレ
ンズにおいて、 第１群の焦点距離をｆ1 、全系の望遠端における焦点距
離をｆT とした時、 0.４＜ｆ1 ／ｆT ＜0.６ (1) 第１群の移動量をｍ、第４群の移動量をｍ4 とした時、 0.４＜ｍ4 ／ｍ1 ＜0.７ (2) 第５群の移動量をｍ5 とした時 0.５＜ｍ5 ／ｍ4 ＜1.０ (3) であることを特徴とするズームレンズ。Claims 1. A first lens group having a positive refractive power, a second group having a negative refractive power, a third group having a negative refractive power, and a positive refractive power in order from the object side. 4th group with aperture, 5th group consisting of aperture
Group, a sixth group having a positive refractive power, and a seventh group having a negative refractive power. The first group, the second group, the fourth group, the fifth group, and the sixth group are moved to the object side. In the telephoto zoom lens, zooming is performed from the wide-angle end to the telephoto end, and image plane movement accompanying zooming is performed by moving the seventh unit, the focal length of the first unit is f 1 , and the focal point of the entire system at the telephoto end is When the distance is f T , 0.4 <f 1 / f T <0.6 (1) When the movement amount of the first group is m and the movement amount of the fourth group is m 4 , 0.4 <f m 4 / m 1 <0.7 (2) A zoom lens characterized by satisfying 0.5 <m 5 / m 4 <1.0 (3) when the amount of movement of the fifth lens unit is m 5 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10333706A JP2000162501A (en) | 1998-11-25 | 1998-11-25 | Zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10333706A JP2000162501A (en) | 1998-11-25 | 1998-11-25 | Zoom lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000162501A true JP2000162501A (en) | 2000-06-16 |
| JP2000162501A5 JP2000162501A5 (en) | 2006-01-19 |
Family
ID=18269063
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10333706A Pending JP2000162501A (en) | 1998-11-25 | 1998-11-25 | Zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000162501A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107255861A (en) * | 2017-08-10 | 2017-10-17 | 福建福光股份有限公司 | A kind of subminaturization, big multiple proportions, the airborne pick-up lens of high definition zoom |
| JP2019158961A (en) * | 2018-03-08 | 2019-09-19 | キヤノン株式会社 | Zoom lens and image capturing device |
| JP2020020948A (en) * | 2018-07-31 | 2020-02-06 | 株式会社シグマ | Zoom imaging optical system |
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|---|---|---|---|---|
| JPS60117209A (en) * | 1983-11-29 | 1985-06-24 | Canon Inc | Zoom lens having stopper |
| JPS61259217A (en) * | 1985-05-14 | 1986-11-17 | Canon Inc | Magnification varying method for zoom lens |
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| JPH06186477A (en) * | 1992-12-18 | 1994-07-08 | Canon Inc | Zoom lens with flare diaphragm |
| JPH0868941A (en) * | 1994-08-30 | 1996-03-12 | Nikon Corp | High-magnification zoom lens |
| JPH0882741A (en) * | 1994-09-13 | 1996-03-26 | Canon Inc | Zoom lens having flare diaphragm |
| JPH095626A (en) * | 1995-06-19 | 1997-01-10 | Nikon Corp | Variable power optical system |
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1998
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60117209A (en) * | 1983-11-29 | 1985-06-24 | Canon Inc | Zoom lens having stopper |
| JPS61259217A (en) * | 1985-05-14 | 1986-11-17 | Canon Inc | Magnification varying method for zoom lens |
| JPH0470709A (en) * | 1990-07-11 | 1992-03-05 | Minolta Camera Co Ltd | Zoom lens |
| JPH0627380A (en) * | 1992-07-07 | 1994-02-04 | Canon Inc | Zoom lens |
| JPH06186477A (en) * | 1992-12-18 | 1994-07-08 | Canon Inc | Zoom lens with flare diaphragm |
| JPH0868941A (en) * | 1994-08-30 | 1996-03-12 | Nikon Corp | High-magnification zoom lens |
| JPH0882741A (en) * | 1994-09-13 | 1996-03-26 | Canon Inc | Zoom lens having flare diaphragm |
| JPH095626A (en) * | 1995-06-19 | 1997-01-10 | Nikon Corp | Variable power optical system |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107255861A (en) * | 2017-08-10 | 2017-10-17 | 福建福光股份有限公司 | A kind of subminaturization, big multiple proportions, the airborne pick-up lens of high definition zoom |
| JP2019158961A (en) * | 2018-03-08 | 2019-09-19 | キヤノン株式会社 | Zoom lens and image capturing device |
| JP7123579B2 (en) | 2018-03-08 | 2022-08-23 | キヤノン株式会社 | Zoom lens and imaging device |
| JP2020020948A (en) * | 2018-07-31 | 2020-02-06 | 株式会社シグマ | Zoom imaging optical system |
| JP7080483B2 (en) | 2018-07-31 | 2022-06-06 | 株式会社シグマ | Variable magnification imaging optical system |
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