【0001】[0001]
【産業上の利用分野】この発明は大口径のズームレンズ
に関する。この発明のズームレンズは、レンズシャッタ
カメラ用ズームレンズとして利用できる。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large-aperture zoom lens. The zoom lens of the present invention can be used as a zoom lens for a lens shutter camera.
【0002】[0002]
【従来の技術】近来、レンズシャッタカメラはズームレ
ンズを搭載したものが主流と成りつつあり、搭載された
ズームレンズの変倍比も3倍程度のものが増えてきてい
る。2. Description of the Related Art In recent years, a lens shutter camera equipped with a zoom lens has become mainstream, and the zoom ratio of the mounted zoom lens has been increased to about three times.
【0003】しかし、変倍比:3倍程度のズームレンズ
は、望遠におけるF/Noが8〜10と暗いものが大部
分であり、望遠での撮影の際のシャッタスピードが遅く
なり、「手ぶれ」を起こしやすい。[0003] However, most zoom lenses having a zoom ratio of about 3 are as dark as 8 to 10 in F / No at telephoto, and the shutter speed at the time of photographing at telephoto becomes slow. ”.
【0004】また、望遠側である焦点距離:100mm
前後は「ポートレート」に適しているが、F/Noが大
きいと前後の「ぼけ効果」が少なく、主題を強調する撮
影ができない。The focal length on the telephoto side is 100 mm.
 The front and rear are suitable for “portrait”, but if the F / No is large, the front and rear “blurring effect” is small, and it is not possible to take a picture that emphasizes the subject.
【0005】特開平5−150161号公報には、F/
No=3.5〜5.5/f=36〜102のズームレン
ズが開示されているが、大口径化で特に発生しやすいコ
マ収差をコントロールする条件が開示されておらず、実
施例においてもコマ収差が多量に残存しており、実用性
能に到っていない。[0005] Japanese Patent Application Laid-Open No. 5-150161 discloses F /
 Although a zoom lens with No = 3.5-5.5 / f = 36-102 is disclosed, a condition for controlling coma aberration that is particularly likely to occur with a large aperture is not disclosed. A large amount of coma remains, and has not reached practical performance.
【0006】また、従来知られたズームレンズで変倍
比:3倍程度のものは、レンズ構成枚数が10枚を超え
るものが多く、コンパクト化・低コスト化が困難であ
る。[0006] Many of the conventionally known zoom lenses having a zoom ratio of about 3 times have more than 10 lenses, and it is difficult to reduce the size and cost.
【0007】[0007]
【発明が解決しようとする課題】この発明は上述した事
情に鑑みてなされたものであって、変倍比が略3倍あ
り、レンズ枚数が7枚と少なくコンパクトであり、望遠
端でのF/No.が6以下と明るい大口径のズームレン
ズの提供を目的としている。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a zoom ratio of approximately three times, a small number of seven lenses, and is compact. / No. The objective is to provide a large-diameter zoom lens that is as bright as 6 or less.
【0008】[0008]
【課題を解決するための手段】この発明の「大口径のズ
ームレンズ」は、図1に示すように、物体側(図の左
方)から像側(右方)へ向かって順次、第1〜第3群を
配して成る。As shown in FIG. 1, a "large-aperture zoom lens" according to the present invention comprises a first zoom lens which is arranged in order from an object side (left side in the figure) to an image side (right side). ~ 3rd group is arranged.
【0009】第1群Iおよび第2群IIは「正の焦点距
離」を有し、第3群は「負の焦点距離」を有する。従っ
て、全体のパワー配分は「正・正・負」である。The first group I and the second group II have a "positive focal length", and the third group has a "negative focal length". Therefore, the overall power distribution is “positive / positive / negative”.
【0010】図1の上の図に示すように、広角端では
「第1群Iと第2群IIとが近接」し、第2群IIと第
3群IIIとの間の間隔が開いている。As shown in the upper part of FIG. 1, at the wide-angle end, "the first group I and the second group II are close to each other", and the distance between the second group II and the third group III is increased. I have.
【0011】また、図1の下の図に示すように、望遠端
では「第2群IIと第3群IIIとが近接し、第1群I
と第2群IIとの間隔が開いている。As shown in the lower part of FIG. 1, at the telephoto end, "the second group II and the third group III are close to each other and the first group I
 And the distance between the second lens group II is wide.
【0012】広角端から望遠端へのズーミングの際に
は、図1に示すように、第1〜第3群が何れも、物体側
へ移動するが、第1群Iおよび第3群IIIに比して、
第2群IIの移動速度が遅いため、ズーミングに従い、
第2群IIと第3群IIIとの間隔が「次第に狭まる」
ことになる。During zooming from the wide-angle end to the telephoto end, as shown in FIG. 1, all of the first to third units move toward the object side. In comparison,
 Since the moving speed of the second group II is slow, following the zooming,
 The distance between the second group II and the third group III is "gradually reduced"
 Will be.
【0013】第1群Iは、1枚の正レンズと1枚の負レ
ンズとにより構成される。第2群IIは、物体側から像
側へ向かって順次、物体側に強い凹面を向けたメニスカ
ス負レンズ、正レンズ、両凸の正レンズを配してなる。
第3群IIIは、1枚の正レンズと1枚の負レンズとで
構成される。従って、全系は3群7枚構成である。ま
た、望遠端でのF/No.は6以下である。The first group I is composed of one positive lens and one negative lens. The second group II includes, in order from the object side to the image side, a meniscus negative lens having a strong concave surface facing the object side, a positive lens, and a biconvex positive lens.
 The third group III includes one positive lens and one negative lens. Therefore, the whole system is composed of three groups and seven elements. Also, F / No. Is 6 or less.
【0014】第2群IIの焦点距離をf2、広角端にお
ける全系の合成焦点距離をfWとするとき、これらは条
件: (1) 0.7<f2/fW<0.8 を満足する。When the focal length of the second lens group II is f2 and the combined focal length of the entire system at the wide-angle end is fW , these conditions are as follows: (1) 0.7 <f2 / fW <0.8 To be satisfied.
【0015】第2群IIの2面以上と、第3群IIIの
1面以上とが非球面である。第2群IIに採用される2
面以上に非球面のうちの、少なくとも1面は「周辺に行
くほど正の屈折力が弱まる」形状である。Two or more surfaces of the second group II and one or more surfaces of the third group III are aspherical surfaces. 2 adopted for the second group II
 At least one of the aspherical surfaces has a shape that “the positive refractive power decreases toward the periphery”.
【0016】第2群IIは上記の如く2面以上に非球面
が採用されるが、第2群における最も像側の「両凸の正
レンズ」の両面を非球面とすることができる(請求項
2)。As described above, the second group II employs two or more aspheric surfaces, but both surfaces of the "biconvex positive lens" closest to the image side in the second group can be made aspheric. Item 2).
【0017】第1群Iは、正レンズ1枚と負レンズ1枚
とで構成されるが、「正レンズと負レンズの接合」によ
り第1群を構成することができる(請求項3)。The first group I is composed of one positive lens and one negative lens, but the first group can be constituted by "joining the positive lens and the negative lens".
【0018】第3群IIIは、1面以上に非球面が採用
されるが、第3群IIIの「物体側に配備される正レン
ズの少なくとも一方の面」を非球面とすることができる
(請求項4)。The third group III employs one or more aspheric surfaces. However, the "at least one surface of the positive lens disposed on the object side" of the third group III may be an aspheric surface ( Claim 4).
【0019】上記請求項1〜4記載のズームレンズにお
いて「第2群IIを物体側へ移動させて合焦を行う」こ
とができる(請求項5)。この場合、第2群IIに前置
して、即ち、第1群Iと第2群IIとの間に、絞りSを
配備し、この絞りSをズーミングの際に、第2群IIと
一体として移動させることができる(請求項6)。In the zoom lens according to the first to fourth aspects, it is possible to "focus by moving the second group II to the object side" (claim 5). In this case, a stop S is provided in front of the second unit II, that is, between the first unit I and the second unit II, and the stop S is integrated with the second unit II during zooming. (Claim 6).
【0020】このように絞りSを設ける場合、「合焦
時」即ち、第2群を物体側に移動させて合焦の動作を行
うとき、「絞りSを固定し、第2群IIを物体側へ移動
させて絞りSと第2群IIとの間隔を狭める」ことがで
きる(請求項7)。In the case where the aperture S is provided in this manner, when the focusing operation is performed by moving the second lens unit to the object side during focusing, that is, when the aperture S is fixed and the second lens unit II is moved Side to reduce the distance between the stop S and the second lens group II "(claim 7).
【0021】[0021]
【作用】上記の如く、この発明の大口径のズームレンズ
は、「正・正・負」の3群構成であり、主として第2群
が「結像作用」を荷なっている。As described above, the large-aperture zoom lens according to the present invention has a three-group configuration of "positive, positive and negative", and the second group mainly carries the "imaging operation".
【0022】変倍比の高いズームレンズでは、ズーミン
グに伴い移動する群の単位で基本収差を補正しておくこ
とが重要であり、この観点から、この発明においても、
第1群および第3群を、正レンズ1枚と負レンズ1枚と
で構成している。In a zoom lens having a high zoom ratio, it is important to correct the basic aberration in units of a group that moves during zooming.
 Each of the first and third units includes one positive lens and one negative lens.
【0023】第1群が正の焦点距離を持つところから、
第1群により光束が絞られるが、望遠では、第1群と第
2群との間隔が開くので、光束幅が狭くなって第2群に
入射する。Since the first unit has a positive focal length,
 The luminous flux is narrowed by the first group, but at telephoto, the distance between the first and second groups is widened, so that the luminous flux width is narrow and the light enters the second group.
【0024】第2群の最初の面を、メニスカス負レンズ
の「強い凹面」とすることにより、広角側の歪曲収差と
下光線の持つ集束性のコマ収差の補正を可能とする。ま
た第2群の「正レンズ成分」を2枚の正レンズ(物体側
の正レンズ、像側の両凸の正レンズ)で構成することに
より、球面収差係数の分担を軽減させ、これら2枚の正
レンズの物体側に置かれる負レンズ(メニスカス負レン
ズ)と共働して、第2群の球面収差係数の和を小さく設
定する。By making the first surface of the second lens unit a "strong concave surface" of the negative meniscus lens, it is possible to correct distortion on the wide-angle side and coma of the focusing property of the lower ray. The “positive lens component” of the second group is composed of two positive lenses (a positive lens on the object side and a positive biconvex lens on the image side), thereby reducing the sharing of spherical aberration coefficient. Cooperates with a negative lens (meniscus negative lens) placed on the object side of the positive lens of (1) to set a small sum of spherical aberration coefficients of the second group.
【0025】このようにすることにより「ズーミングに
おける球面収差の変動、合焦における球面収差の変動」
を小さく抑えることができる。By doing so, "variation in spherical aberration during zooming, variation in spherical aberration during focusing"
 Can be kept small.
【0026】条件(1)は、上記の如きレンズ構成にお
ける第2群の焦点距離の適正な範囲を規定するものであ
る。条件(1)のパラメータ:f2/fWが小さくなる
と、第2群の正のパワーが相対的に強くなり、ズームレ
ンズの小型化には有利であるが、(1)の下限を超える
と「広角側の球面収差が補正不足」になる。このような
広角側の補正不足を取り除くためにはレンズ枚数を増大
させる必要があり、何れにしても不具合である。The condition (1) defines an appropriate range of the focal length of the second lens unit in the above-described lens configuration. Parameter (1): When f2 / fW is small, the positive power of the second lens unit is relatively strong, which is advantageous for reducing the size of the zoom lens. "The spherical aberration on the wide-angle side is insufficiently corrected". In order to remove such insufficient correction on the wide-angle side, it is necessary to increase the number of lenses.
【0027】条件(1)の上限を超えると、軸上光の集
束力が不足し、バックフォーカスが大きくなるので「ズ
ーム全域での小型化の達成が困難」になる。When the value exceeds the upper limit of the condition (1), the focusing power of the on-axis light is insufficient, and the back focus becomes large, so that it is difficult to achieve the miniaturization over the entire zoom range.
【0028】条件(1)を満足することにより、ズーム
レンズを「少ない構成枚数で小型且つ十分な実用性能で
実現する」ことが可能になる。By satisfying the condition (1), the zoom lens can be "realized with a small number of components and with sufficient practical performance".
【0029】さらに、条件(1)を満足することによ
り、後述の実施例からも明らかなように、極めて良好な
性能の実現が可能になる。Further, by satisfying the condition (1), it becomes possible to realize extremely good performance, as is clear from the examples described later.
【0030】第2群は、群内収差の和を小さく抑えるた
め、上述の如く「物体側から像側へ向かって順次、物体
側に強い凹面を向けたメニスカス負レンズ、正レンズ、
両凸の正レンズを配し」た構成としたが、大口径・高性
能を実現するには、非球面の使用が必要である。In order to reduce the sum of intra-group aberrations, the second lens group includes, as described above, "a meniscus negative lens, a positive lens having a strong concave surface facing the object side sequentially from the object side to the image side,
 Although a biconvex positive lens is provided, it is necessary to use an aspheric surface in order to achieve a large aperture and high performance.
【0031】第2群では2面以上に非球面が採用される
が、少なくとも1面の非球面は「周辺に行くほど正の屈
折力が弱まる」形状とし、第2群でアンダーに発生しや
すい球面収差を減少させる。In the second lens unit, two or more aspherical surfaces are employed, but at least one aspherical surface has a shape such that the positive refractive power decreases toward the periphery, and the second lens unit is likely to generate an undersurface. Reduce spherical aberration.
【0032】第2群の像側の面(両凸レンズの像側面)
では、軸上における周辺光の屈折角が大きいので、この
面に非球面を用いることは特に有効である(請求項
2)。また、第2群の物体側の面(メニスカス負レンズ
の強い凹面)は下光線を大きく屈折させるため、この面
に非球面を採用することも有効である。Image-side surface of second group (image side surface of biconvex lens)
 In this case, since the refraction angle of the peripheral light on the axis is large, it is particularly effective to use an aspheric surface for this surface (claim 2). In addition, since the object-side surface of the second lens unit (the strong concave surface of the meniscus negative lens) refracts the lower ray largely, it is also effective to adopt an aspheric surface for this surface.
【0033】広角側では、第2群と第3群の間隔が開
き、軸外光線は互いに分離した状態で第3群を通過する
ため、第3群に非球面を採用すると「個々の画角に応じ
て像面湾曲を制御でき、且つ、広角側で正に大きくなり
がちな歪曲収差の補正を行う」ことが可能となる。On the wide-angle side, the distance between the second lens unit and the third lens unit increases, and off-axis rays pass through the third lens unit in a state where they are separated from each other. , And the distortion which tends to become large positively on the wide-angle side can be corrected ".
【0034】この場合、「第3群の物体側の正レンズの
少なくとも一方の面」は、有効径が小さく、この面を非
球面とする(請求項4)と、レンズ径が小さいため加工
性が良い。In this case, "at least one surface of the positive lens on the object side of the third group" has a small effective diameter, and if this surface is an aspheric surface (claim 4), since the lens diameter is small, the workability is small. Is good.
【0035】上記の如く、第2群のレンズ構成と非球面
の採用により、第2群内の各収差係数の和を小さくでき
るので、第2群により「合焦」を行えば(請求項5)、
合焦に伴う収差変動を極小にできる。As described above, the sum of the aberration coefficients in the second group can be reduced by adopting the lens configuration of the second group and the aspherical surface. ),
 Aberration fluctuation due to focusing can be minimized.
【0036】また、「絞り」は結像群である第2群の近
傍に配備されるのが好ましいが、第2群内に設けること
は、絞りの両側にレンズを設けるための機構が複雑化す
るし、第2群の像側に置くと、周辺光量を維持するため
に前玉径が大きくなる。The "aperture" is preferably provided in the vicinity of the second group which is an image forming group. However, providing the "aperture" in the second group complicates a mechanism for providing lenses on both sides of the aperture. Then, when the lens unit is placed on the image side of the second lens unit, the diameter of the front lens becomes large in order to maintain the peripheral light amount.
【0037】さらに、合焦時に絞り(シャッタ)を固定
した構造にすると、合焦群である第2群をシャッタユニ
ットに背負わせたフォーカスモータで移動させることが
できるため、フォーカスリングを不要にできる。Further, if the aperture (shutter) is fixed at the time of focusing, the second group, which is the focusing group, can be moved by the focus motor mounted on the shutter unit, so that the focus ring is not required. .
【0038】[0038]
【実施例】以下、具体的な実施例を5例挙げる。The following are five specific examples.
【0039】図1に示すように、物体側から数えて第i
番目の面(絞り面を含む)の曲率半径をRi(非球面に
関しては光軸上の曲率半径)、第i番目と第i+1番目
の面の光軸上の間隔をDi、物体側から数えて第j番目
のレンズの材質の、d線に対する屈折率およびアッベ数
をそれぞれNj,νjで表わす。また、fは全系の焦点距
離、Bfはバックフォーカス、F/Noは明るさ、ωは
半画角を表わす。As shown in FIG. 1, the i-th counting from the object side
 The radius of curvature of thei -th surface (including the stop surface) is Ri (the radius of curvature on the optical axis for an aspheric surface), the distance on the optical axis between the i-th and (i + 1) -th surfaces is Di , counting the j-th lens material, refractive index and the d-line Abbe number, respectively Nj, represented by [nuj. F is the focal length of the entire system, Bf is the back focus, F / No is the brightness, and ω is the half angle of view.
【0040】非球面は、光軸に合致させてZ軸を取り、
光軸に直交させてY軸を設定するとき、光軸上の近軸曲
率半径:R、円錐定数:K、高次の非球面係数:A,
B,C,Dを用いて、 Z=(1/R)2Y2/[1+√{1−(1+K)(Y/
R)2}]+A・Y4+B・Y6+C・Y8+D・Y10 で表わされる曲線を、光軸の周りに回転して得られる曲
面であり、光軸上の近軸曲率半径Rと、円錐定数:K、
非球面係数:A,B,C,Dを与えて形状を特定する。
なお、非球面の表示において「Eとそれに続く数字」と
は「べき乗」を表わす。例えば、「E−9」とあれば、
これは「10~9」を表わし、この数字が、その直前の数
値に掛かるのである。The aspherical surface takes the Z axis in accordance with the optical axis,
 When the Y axis is set perpendicular to the optical axis, the paraxial radius of curvature on the optical axis: R, the conic constant: K, the higher order aspherical coefficient: A,
 Using B, C, and D, Z = (1 / R)2 Y2 / [1 + √ {1- (1 + K) (Y /
 R)2 }] + A · Y4 + B · Y6 + C · Y8 + D · Y10 is a curved surface obtained by rotating the curve around the optical axis, and has a paraxial radius of curvature R on the optical axis. And the conic constant: K,
 Aspherical surface coefficients: A, B, C, and D are given to specify the shape.
 In the display of the aspherical surface, “E followed by a numeral” indicates “power”. For example, if it is "E-9",
 This represents "10 to9 ", and this number is multiplied by the numerical value immediately before it.
【0041】実施例1 f=39.134〜111.517,F/No=4.2〜5.9 i Ri Di j Nj νj 1 20.111 4.5 1 1.84666 23.78 2 14.535 2.866 2 1.51454 54.54 3 35.283 可変 4 ∞(絞り) 3.964 5 −9.325 0.7 3 1.58590 48.86 6 −90.02 0.1 7 179.208 2.817 4 1.48749 70.44 8 −15.498 0.1 9 56.528 3.181 5 1.48749 40.44 10 −13.541 可変 11 −14.629 2.708 6 1.84666 23.78 12 −12.977 0.3 13 −16.991 1.6 7 1.69680 55.46 14 −789.366 。Example 1 f = 39.134 to 111.517, F / No = 4.2 to 5.9 i Ri Di ij Nj vj 1 20.111 4.5 1 1.866666 78 2 14.535 2.866 2 1.51454 54.54 3 35.283 Variable 4 ° (aperture) 3.964 5 -9.325 0.73 1.58590 48.86 6 -90.02 0.0. 17 179.208 2.817 4 1.48749 70.448 to 15.498 0.19 56.528 3.181 5 1.48749 40.44 10 to 13.541 Variable 11 to 14.629 2. 708 6 1.84666 23.78 12 -12.977 0.313 -16.991 1.67 1.66980 55.46 14 -789.366.
【0042】 非球面 第5面: K=−0.16225, A= 1.66929E−5,B= 9.98605E−7, C=−1.35942E−8,D= 1.42480E−10 第10面: K=−0.37403, A= 6.75499E−5,B= 5.63113E−7, C=−7.87490E−9,D= 4.41710E−11 第11面: K=−1.65911, A= 6.29761E−6,B= 3.70790E−7, C=−4.48256E−10,D=−2.87261E−12 第12面: K=−1.42928, A=−2.14110E−5,B= 1.63875E−7, C= 1.49530E−9,D=−7.29855E−12 。Aspheric Surface Fifth Surface: K = −0.16225, A = 1.66929E−5, B = 9.96605E−7, C = −1.35942E−8, D = 1.4480E−10 Tenth Surface: K = -0.37403, A = 6.75499E-5, B = 5.63113E-7, C = -8.787490E-9, D = 4.41710E-11 Eleventh surface: K = -1. 65911, A = 6.29761E-6, B = 3.707790E-7, C = -4.48256E-10, D = -2.87261E-12 12th surface: K = -1.42928, A = -2 .14110E-5, B = 1.63875E-7, C = 1.49530E-9, D = -7.255855E-12.
【0043】 可変量 広角端 中間焦点距離 望遠端 f 39.134 66.062 111.517 D3 1.646 13.547 22.826 D10 19.11 9.805 3.172 Bf 7.0 29.0 63.642 F/No 4.2 5.0 5.9 ω 28.22 17.67 10.81 。Variable amount Wide-angle end Intermediate focal length Telephoto end f 39.134 66.06 111.517 D3 1.646 13.547 22.826 D10 19.11 9.805 3.172 Bf 7.0 29. 0 633.642 F / No 4.2 5.0 5.9 ω 28.22 17.67 10.81.
【0044】条件式のパラメータの値 f2/fW=0.76 図1(a)(b)(c)に実施例1に関する広角端、中
間焦点距離および望遠端におけるレンズ配置を示す。ま
た、実施例1に関する広角端に於ける収差図を図6に、
中間焦点距離における収差図を図7に、望遠端における
収差図を図8に示す。球面収差の図におけるSA
(d),SA(g)はd線およびg線に対する球面収
差、SCは正弦条件、非点収差の図におけるDS
(d),DS(g)はd線およびg線に対するサジタル
像面、DM(d),DM(g)はd線およびg線に対す
るメリディオナル像面を表わす。The value of the condition equation parameters f2 / fW = 0.76 FIG. 1 (a) (b) wide angle end for Example 1 (c), the shows a lens arrangement at the intermediate focal length and the telephoto end. FIG. 6 shows aberration diagrams at the wide-angle end according to the first embodiment.
 FIG. 7 shows an aberration diagram at the intermediate focal length, and FIG. 8 shows an aberration diagram at the telephoto end. SA in the figure of spherical aberration
 (D), SA (g) are spherical aberrations for the d-line and g-line, SC is a sine condition, and DS in the astigmatism diagram.
 (D) and DS (g) represent sagittal image planes for d-line and g-line, and DM (d) and DM (g) represent meridional image planes for d-line and g-line.
【0045】実施例2 f=39.141〜111.549,F/No=4.2〜5.9 i Ri Di j Nj νj 1 20.006 5.55 1 1.84666 23.78 2 14.126 3.12 2 1.51680 64.20 3 33.962 可変 4 ∞(絞り) 3.71 5 −10.388 1.51 3 1.83500 42.98 6 −28.373 0.1 7 240.042 3.30 4 1.48749 70.44 8 −14.170 0.1 9 148.087 2.81 5 1.58313 59.46 10 −18.143 可変 11 −12.162 2.68 6 1.80518 25.46 12 −11.757 0.74 13 −16.030 1.6 7 1.62041 60.34 14 −742.849 。Example 2 f = 39.141 to 111.549, F / No = 4.2 to 5.9 i Ri Di ij Nj vj 1 20.006 5.55 1 1.86666 23. 78 2 14.126 3.12 2 1.51680 64.20 3 33.962 Variable 4 ° (aperture) 3.715-10.388 1.51 3 1.83500 42.986-28.373 0. 17 240.042 3.30 4 1.48749 70.44 8 -14.170 0.19 148.087 2.81 5 1.583313 59.46 10 -18.143 Variable 11-12.162 2. 686 1.80518 25.46 12 -11.57 0.74 13 -16.030 1.67 1.62041 60.34 14 -742.849.
【0046】 非球面 第9面: K= 0.0 , A= 2.52343E−5,B= 4.86988E−7, C=−5.49378E−9,D= 1.57781E−10 第10面: K=−0.35713, A= 5.99652E−5,B= 4.97286E−7, C=−3.72441E−9,D= 1.43817E−10 第11面: K=−1.67133, A= 2.57263E−5,B= 6.20233E−7, C=−2.65283E−9,D= 3.83586E−12 第12面: K=−1.49651, A=−9.04572E−6,B= 4.03925E−7, C=−3.72942E−10,D=−2.20656E−12 。Aspheric surface ninth surface: K = 0.0, A = 2.52343E-5, B = 4.886988E-7, C = -5.37878E-9, D = 1.57781E-10 tenth surface : K = -0.35713, A = 5.996652E-5, B = 4.97286E-7, C = -3.72441E-9, D = 1.43817E-10 Eleventh surface: K = -1.671133 , A = 2.57263E-5, B = 6.0233E-7, C = -2.65283E-9, D = 3.883586E-12, twelfth surface: K = -1.49651, A = -9.04572E. −6, B = 4.003925E-7, C = −3.72942E-10, D = −2.2656E-12.
【0047】 可変量 広角端 中間焦点距離 望遠端 f 39.141 66.079 111.549 D3 2.0 12.932 33.962 D10 17.745 9.136 3.0 Bf 7.049 28.313 63.056 F/No 4.2 5.0 5.9 ω 28.63 17.68 10.8 。Variable amount Wide-angle end Intermediate focal length Telephoto end f 39.141 66.079 111.549 D3 2.0 12.932 33.962 D10 17.745 9.136 3.0 Bf 7.049 28. 313 63.056 F / No 4.2 5.0 5.9 ω 28.63 17.68 10.8.
【0048】条件式のパラメータの値 f2/fW=0.71 図2に実施例2に関する広角端におけるレンズ配置を示
す。実施例2に関する広角端に於ける収差図を図9に、
中間焦点距離における収差図を図10に、望遠端におけ
る収差図を図11に示す。[0048] Condition value f2 / fW = 0.71 Figure 2 parameters of equation showing a lens arrangement at the wide angle end for Example 2. FIG. 9 shows aberration diagrams at the wide angle end according to the second embodiment.
 FIG. 10 is an aberration diagram at the intermediate focal length, and FIG. 11 is an aberration diagram at the telephoto end.
【0049】実施例3 f=39.149〜111.59,F/No=4.0〜6.0 i Ri Di j Nj νj 1 20.664 4.50 1 1.84666 23.80 2 13.321 0.10 3 13.087 3.029 2 1.65825 42.22 4 28.604 可変 5 ∞(絞り) 3.908 6 −8.990 0.7 3 1.70780 44.60 7 −27.452 0.10 8 −128.474 2.522 4 1.48749 70.44 9 −14.898 0.10 10 65.099 3.093 5 1.48749 70.44 11 −12.725 可変 12 −29.356 2.605 6 1.84666 23.80 13 −19.552 0.50 14 −19.483 1.60 7 1.66460 56.86 15 51.849 。Example 3 f = 39.149 to 111.59, F / No = 4.0 to 6.0 i Ri Di ij Nj vj 1 20.664 4.50 1 1.86666 23. 80 2 13.321 0.10 3 13.087 3.029 2 1.65825 42.22 4 28.604 Variable 5 ° (aperture) 3.908 6 -8.990 0.73 1.707780 44.60 7 -27.452 0.108 -128.474 2.522 4 1.48749 70.449-14.898 0.10 10 65.099 3.093 5 1.48749 70.44 11 -12.725 Variable 12-29.356 2.605 6 1.86666 23.80 13 -19.552 0.50 14 -19.483 1.60 7 1.66460 56.86 15 51.849.
【0050】 非球面 第6面: K=−0.12323, A= 4.64403E−5,B=−4.82754E−7, C= 4.03037E−8,D=−4.54852E−10 第11面: K=−0.55683, A= 8.46036E−5,B=−1.16346E−7, C= 3.80708E−9,D=−4.64408E−11 第13面: K=−0.31593, A= 2.03291E−5,B=−4.87759E−7, C= 5.17506E−9,D=−1.59706E−11 第15面: K=−85.76145, A= 2.29936E−5,B=−1.08112E−7, C=−2.18335E−10,D= 1.19264E−12 。Aspheric Surface Sixth Surface: K = −0.12323, A = 4.64043E-5, B = −4.82754E-7, C = 4.03037E−8, D = −4.55482E−10 11th surface: K = -0.55683, A = 8.46036E-5, B = -1.16346E-7, C = 3.80708E-9, D = -4.64408E-11 13th surface: K =- 0.31593, A = 2.03291E-5, B = −4.87759E-7, C = 5.17506E-9, D = −1.59706E-11 15th surface: K = −85.76145, A = 2.29936E-5, B = -1.08112E-7, C = -2.183335E-10, D = 1.19264E-12.
【0051】 可変量 広角端 中間焦点距離 望遠端 f 39.149 66.094 111.59 D4 1.753 11.852 18.3 D11 17.077 8.192 1.976 Bf 8.505 30.005 65.79 F/No 4.0 4.9 6.0 ω 28.34 17.64 10.83 。Variable amount Wide-angle end Intermediate focal length Telephoto end f 39.149 66.0911.59 D4 1.753 11.852 18.3 D11 17.077 8.192 1.976 Bf 8.505 30. 005 65.79 F / No 4.0 4.9 6.0 ω 28.34 17.64 10.83.
【0052】条件式のパラメータの値 f2/fW=0.75 図3に実施例3に関する広角端におけるレンズ配置を示
す。実施例3に関する広角端に於ける収差図を図12
に、中間焦点距離における収差図を図13に、望遠端に
おける収差図を図14に示す。[0052] the value f2 / fW = 0.75 Figure 3 of the condition parameters showing a lens arrangement at the wide angle end for Example 3. FIG. 12 shows aberration diagrams at the wide-angle end according to the third embodiment.
 FIG. 13 shows an aberration diagram at the intermediate focal length, and FIG. 14 shows an aberration diagram at the telephoto end.
【0053】実施例4 f=39.154〜111.618,F/No=3.7〜6.0 i Ri Di j Nj νj 1 19.349 4.50 1 1.84666 23.80 2 14.525 2.804 2 1.51222 67.52 3 31.499 可変 4 ∞(絞り) 3.977 5 −9.285 0.7 3 1.69206 46.03 6 −33.672 0.1 7 −1301.072 2.667 4 1.48749 70.44 8 −15.893 0.1 9 62.963 3.216 5 1.48749 70.44 10 −12.863 可変 11 −30.193 2.464 6 1.84666 23.80 12 −20.561 0.5 13 −20.546 1.6 7 1.64761 57.66 14 47.970 。[0053] Example 4 f = 39.154~111.618, F / No = 3.7~6.0 i R i D i j N j ν j 1 19.349 4.50 1 1.84666 23. 80 2 14.525 2.804 2 1.51222 67.52 3 31.499 Variable 4 ° (aperture) 3.977 5 -9.285 0.73 1.69206 46.03 6 -33.672 0. 17 -1301.072 2.667 4 1.48749 70.48-15.893 0.19 62.963 3.216 5 1.48749 70.44 10-12.863 Variable 11-30.193 2 .464 6 1.84666 23.80 12 -20.561 0.513 -20.546 1.67 1.664761 57.66 14 47.970.
【0054】 非球面 第5面: K=−0.13525, A= 4.11071E−5,B=−3.92581E−7, C= 3.51089E−8,D=−3.62064E−10 第10面: K=−0.57203, A= 8.34273E−5,B=−7.18623E−8, C= 3.71880E−9,D=−4.66675E−11 第12面: K=−0.09495, A= 2.04990E−5,B=−3.79364E−7, C= 3.85309E−9,D=−1.04658E−11 第14面: K=−63.64590, A= 2.36156E−5,B=−1.17437E−7, C=−2.56071E−11,D= 5.82982E−13 。Aspheric surface 5th surface: K = −0.13525, A = 4.111071E-5, B = −3.92581E-7, C = 3.51089E-8, D = −3.62064E-10 10th surface: K = -0.57203, A = 8.334273E-5, B = -7.18623E-8, C = 3.771880E-9, D = -4.66675E-11 12th surface: K =- 0.09495, A = 2.04990E-5, B = -3.794364E-7, C = 3.853309E-9, D = -1.04658E-11 Surface 14: K = -63.664590, A = 2.36156E-5, B = -1.17437E-7, C = -2.56071E-11, D = 5.82982E-13.
【0055】 可変量 広角端 中間焦点距離 望遠端 f 39.154 66.105 111.618 D3 1.774 12.395 19.422 D10 17.328 8.286 1.926 Bf 8.508 30.027 65.554 F/No 3.7 4.67 6.0 ω 28.18 17.63 10.82 。Variable amount Wide-angle end Intermediate focal length Telephoto end f 39.154 66.105 111.618 D3 1.774 12.395 19.422 D10 17.328 8.286 1.926 Bf 8.508 30. 027 65.554 F / No 3.7 4.67 6.0 ω 28.18 17.63 10.82.
【0056】条件式のパラメータの値 f2/fW=0.76 図4に実施例4に関する広角端におけるレンズ配置を示
す。実施例4に関する広角端に於ける収差図を図15
に、中間焦点距離における収差図を図16に、望遠端に
おける収差図を図17に示す。FIG. 4 shows the lens arrangement of the fourth embodiment at the wide-angle end, where f2 / fW = 0.76. FIG. 15 shows aberration diagrams at the wide angle end according to the fourth embodiment.
 FIG. 16 shows aberration diagrams at the intermediate focal length, and FIG. 17 shows aberration diagrams at the telephoto end.
【0057】実施例5 f=39.143〜111.469,F/No=4.2〜5.9 i Ri Di j Nj νj 1 20.860 4.455 1 1.84666 23.78 2 13.368 0.287 3 13.446 3.099 2 1.59686 40.76 4 32.947 可変 5 ∞(絞り) 3.801 6 −9.670 0.7 3 1.60096 47.95 7 −48.882 0.1 8 337.796 3.112 4 1.48749 70.44 9 −12.383 0.1 10 1296.865 2.582 5 1.48749 70.44 11 −15.621 可変 12 −34.297 3.437 6 1.81838 29.59 13 −21.541 1.43 14 −16.356 1.6 7 1.69680 55.46 15 269.140 。Example 5 f = 39.143 to 111.469, F / No = 4.2 to 5.9 i Ri Di ij Nj vj 1 20.860 4.455 1 1.86666 23. 78 2 13.368 0.287 3 13.446 3.099 2 1.59686 40.76 4 32.947 Variable 5 ° (aperture) 3.801 6-9.670 0.73 1.6006 96 47.95 7-48.882 0.18 337.7796 3.112 4 1.48749 70.449 9-12.383 0.1 10 1296.865 2.582 5 1.48749 70.44 11-15.621 Variable 12-34.297 3.437 6 1.81838 29.59 13 -21.541 1.43 14 -16.356 1.6 7 1.69680 55.46 15 269.140.
【0058】 非球面 第6面: K=−0.23538, A= 3.50393E−5,B= 5.81822E−7, C=−1.89349E−8,D=−6.74816E−11 第7面: K=−81.790881, A= 3.62887E−5,B= 9.77226E−8, C=−3.62239E−9,D= 5.51733E−11 第10面: K= 32915.75194, A= 3.35648E−5,B=−9.63915E−7, C=−1.89736E−9,D= 3.31658E−11 第11面: K= 0.19656, A= 4.60605E−5,B= 1.10709E−7, C=−1.89108E−8,D= 1.21098E−10 第13面: K=−0.12169, A=−2.04834E−5,B=−2.48543E−8, C= 2.63102E−10,D=−1.59087E−12 。Aspheric Surface Sixth Surface: K = −0.23538, A = 3.503393E-5, B = 5.818222E-7, C = −1.89349E-8, D = −6.774816E-11 Seventh surface: K = -81.790881, A = 3.62887E-5, B = 9.777226E-8, C = -3.622239E-9, D = 5.517333E-11 Tenth surface: K = 32915. 75194, A = 3.3648E-5, B = -9.63915E-7, C = -1.897736E-9, D = 3.36586E-11 Eleventh surface: K = 0.19656, A = 4.606005E −5, B = 1.10709E−7, C = −1.89108E−8, D = 1.21098E−10, thirteenth surface: K = −0.12169, A = −2.04834E−5, B = − .48543E-8, C = 2.63102E-10, D = -1.59087E-12.
【0059】 可変量 広角端 中間焦点距離 望遠端 f 39.143 66.064 111.469 D4 1.673 13.487 27.713 D11 17.701 8.032 1.4 Bf 7.58 29.728 60.1 F/No 4.2 5.0 5.9 ω 28.19 18.0 11.0 。Variable amount Wide-angle end Intermediate focal length Telephoto end f 39.143 66.064 111.469 D4 1.673 13.487 27.713 D11 17.701 8.032 1.4 Bf 7.58 29. 728 60.1 F / No 4.2 5.0 5.9 ω 28.19 18.0 11.0.
【0060】条件式のパラメータの値 f2/fW=0.79 図5に実施例5に関する広角端におけるレンズ配置を示
す。実施例5に関する広角端に於ける収差図を図18
に、中間焦点距離における収差図を図19に、望遠端に
おける収差図を図20に示す。[0060] the value f2 / fW = 0.79 Figure 5 of the condition parameters showing a lens arrangement at the wide angle end for Example 5. FIG. 18 shows aberration diagrams at the wide-angle end according to the fifth embodiment.
 19 shows an aberration diagram at the intermediate focal length, and FIG. 20 shows an aberration diagram at the telephoto end.
【0061】図6〜図20の各収差図に明らかなよう
に、各実施例とも性能良好である。As is clear from the aberration diagrams in FIGS. 6 to 20, each of the embodiments has good performance.
【0062】[0062]
【発明の効果】以上に説明したように、この発明によれ
ば新規な大口径のズームレンズを提供できる(請求項1
〜7)。As described above, according to the present invention, a novel large-aperture zoom lens can be provided.
 ~ 7).
【0063】この発明のズームレンズは、上記の如き構
成となっているので、7枚構成と構成枚数が少ないから
コンパクト且つ低コストで実現でき、しかも性能が良好
であり、望遠端においてもF/No:6以下と明るい。Since the zoom lens according to the present invention has the above-described configuration, it can be realized compactly and at low cost because the number of components is small and the number of components is seven, and the performance is good. No: Bright as 6 or less.
【0064】請求項2記載の発明のように、第2レンズ
群の最も像側の正レンズの両面を非球面にすると、この
正レンズ以外の2枚のレンズは研磨法により作製できる
ので、性能維持と低コスト化を両立させることができ
る。負・正・正の構成を持つ第2群では、最も像側の両
凸レンズの両面を非球面にするのが最も効果的である。If both surfaces of the positive lens closest to the image in the second lens group are made aspherical as in the second aspect of the present invention, the other two lenses can be manufactured by a polishing method. Both maintenance and cost reduction can be achieved. In the second group having negative, positive, and positive configurations, it is most effective to make both surfaces of the biconvex lens closest to the image side aspherical.
【0065】請求項3記載の発明のように、第1群を正
・負レンズの接合レンズとすると、第1群内の偏心の影
響が極小と成るから、組付け性が向上し、内面反射の軽
減により性能劣化を有効に防止できる。また接合面の公
差が拡がり、加工性が向上する。If the first lens unit is a cemented lens of positive and negative lenses, the influence of the eccentricity in the first lens unit is minimized, so that the assemblability is improved and the internal reflection is improved. Thus, the performance can be effectively prevented from being reduced by the reduction of the number. In addition, the tolerance of the joining surface is increased, and the workability is improved.
【0066】請求項4記載の発明のように、第3群の物
体側の正レンズの面に非球面を採用すると、レンズの径
が小さくなるため、非球面形成のコストの低減化を計る
ことができる。If an aspherical surface is used as the surface of the positive lens on the object side of the third lens unit, the diameter of the lens becomes small, so that the cost of forming the aspherical surface can be reduced. Can be.
【0067】請求項5記載の発明のように、第2群の移
動により合焦を行うことにより、合焦に伴う収差変動を
極小にできる。また第2群は有効径が最も小さいので、
合焦のためのメカニズムをコンパクトに構成できる。As in the fifth aspect of the present invention, by performing focusing by moving the second lens unit, aberration fluctuations due to focusing can be minimized. Also, the second group has the smallest effective diameter,
 The mechanism for focusing can be made compact.
【0068】請求項6記載の発明のように、絞りを第2
群に前置すると、絞りを第2群内に配備する場合に生じ
る絞り前後にレンズを配置することに伴う機構の複雑化
を招来することも無く、絞りを第2群に後置することに
よる前玉径の増大の問題も無い。According to the sixth aspect of the present invention, the aperture is set to the second
 When the stop is provided in front of the group, the arrangement of the lenses before and after the stop which occurs when the stop is disposed in the second group does not cause the mechanism to be complicated, and the stop is provided in the second group. There is no problem of an increase in the front lens diameter.
【0069】請求項7記載の発明のように合焦時に絞り
を固定することにより、前述の如くフォーカスリングを
省略でき、ズームレンズ搭載カメラをさらに小型化でき
る。By fixing the aperture at the time of focusing as in the invention of claim 7, the focus ring can be omitted as described above, and the camera with the zoom lens can be further miniaturized.
【図面の簡単な説明】[Brief description of the drawings]
【図1】この発明の大口径のズームレンズのレンズ構成
とズーミングに伴う各群の移動を説明するための図であ
る。FIG. 1 is a diagram for explaining a lens configuration of a large-diameter zoom lens according to the present invention and movement of each group due to zooming.
【図2】実施例2のズームレンズの広角端に於けるレン
ズ配置を示す図である。FIG. 2 is a diagram illustrating a lens arrangement at a wide-angle end of a zoom lens according to a second embodiment.
【図3】実施例3のズームレンズの広角端に於けるレン
ズ配置を示す図である。FIG. 3 is a diagram illustrating a lens arrangement at a wide-angle end of a zoom lens according to a third embodiment.
【図4】実施例4のズームレンズの広角端に於けるレン
ズ配置を示す図である。FIG. 4 is a diagram showing a lens arrangement at a wide-angle end of a zoom lens according to a fourth embodiment.
【図5】実施例5のズームレンズの広角端に於けるレン
ズ配置を示す図である。FIG. 5 is a diagram showing a lens arrangement at a wide-angle end of a zoom lens according to a fifth embodiment.
【図6】実施例1の広角端に関する収差図である。FIG. 6 is an aberration diagram relating to a wide-angle end according to the first embodiment.
【図7】実施例1の中間焦点距離に関する収差図であ
る。FIG. 7 is an aberration diagram relating to an intermediate focal length of the first embodiment.
【図8】実施例1の望遠端に関する収差図である。FIG. 8 is an aberration diagram relating to a telephoto end in the first embodiment.
【図9】実施例2の広角端に関する収差図である。FIG. 9 is an aberration diagram relating to a wide-angle end according to the second embodiment.
【図10】実施例2の中間焦点距離に関する収差図であ
る。FIG. 10 is an aberration diagram relating to an intermediate focal length of the second embodiment.
【図11】実施例2の望遠端に関する収差図である。FIG. 11 is an aberration diagram relating to a telephoto end in the second embodiment.
【図12】実施例3の広角端に関する収差図である。FIG. 12 is an aberration diagram relating to a wide-angle end according to the third embodiment.
【図13】実施例3の中間焦点距離に関する収差図であ
る。FIG. 13 is an aberration diagram relating to an intermediate focal length of the third embodiment.
【図14】実施例3の望遠端に関する収差図である。FIG. 14 is an aberration diagram relating to a telephoto end in Example 3.
【図15】実施例4の広角端に関する収差図である。FIG. 15 is an aberration diagram relating to a wide-angle end according to the fourth embodiment.
【図16】実施例4の中間焦点距離に関する収差図であ
る。FIG. 16 is an aberration diagram relating to an intermediate focal length of the fourth embodiment.
【図17】実施例4の望遠端に関する収差図である。FIG. 17 is an aberration diagram relating to a telephoto end in Example 4.
【図18】実施例5の広角端に関する収差図である。FIG. 18 is an aberration diagram relating to a wide-angle end according to the fifth embodiment.
【図19】実施例5の中間焦点距離に関する収差図であ
る。FIG. 19 is an aberration diagram relating to an intermediate focal length in Example 5.
【図20】実施例5の望遠端に関する収差図である。FIG. 20 is an aberration diagram relating to a telephoto end in Example 5.
I 第1群 II 第2群 III 第3群 I First group II Second group III Third group
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7,DB名) G02B 9/00 - 17/08 G02B 21/02 - 21/04 G02B 25/00 - 25/04──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl.7 , DB name) G02B 9/00-17/08 G02B 21/02-21/04 G02B 25/00-25/04
| Application Number | Priority Date | Filing Date | Title | 
|---|---|---|---|
| JP6283801AJP3032126B2 (en) | 1994-11-17 | 1994-11-17 | Large aperture zoom lens | 
| Application Number | Priority Date | Filing Date | Title | 
|---|---|---|---|
| JP6283801AJP3032126B2 (en) | 1994-11-17 | 1994-11-17 | Large aperture zoom lens | 
| Publication Number | Publication Date | 
|---|---|
| JPH08146297A JPH08146297A (en) | 1996-06-07 | 
| JP3032126B2true JP3032126B2 (en) | 2000-04-10 | 
| Application Number | Title | Priority Date | Filing Date | 
|---|---|---|---|
| JP6283801AExpired - Fee RelatedJP3032126B2 (en) | 1994-11-17 | 1994-11-17 | Large aperture zoom lens | 
| Country | Link | 
|---|---|
| JP (1) | JP3032126B2 (en) | 
| Publication number | Priority date | Publication date | Assignee | Title | 
|---|---|---|---|---|
| JP3412939B2 (en)* | 1994-12-22 | 2003-06-03 | キヤノン株式会社 | Zoom lens | 
| JPH08262325A (en)* | 1995-03-20 | 1996-10-11 | Minolta Co Ltd | Zoom lens | 
| JP3936625B2 (en)* | 2002-05-27 | 2007-06-27 | オリンパス株式会社 | Zoom lens for Greenough-type stereomicroscope | 
| JP2012173299A (en)* | 2011-02-17 | 2012-09-10 | Sony Corp | Imaging lens and imaging apparatus | 
| TWI570467B (en) | 2012-07-06 | 2017-02-11 | 大立光電股份有限公司 | Optical image pickup system group | 
| TWI449947B (en) | 2012-08-13 | 2014-08-21 | Largan Precision Co Ltd | Image lens assembly system | 
| TWI507723B (en) | 2014-08-01 | 2015-11-11 | Largan Precision Co Ltd | Imaging optical lens group, image capturing device and electronic device | 
| TWI595261B (en) | 2016-02-04 | 2017-08-11 | 大立光電股份有限公司 | Optical lens group for imaging, image capturing device, and electronic device | 
| US10578834B2 (en)* | 2017-12-29 | 2020-03-03 | AAC Technologies Pte. Ltd. | Camera optical lens | 
| JP7123383B2 (en)* | 2018-06-12 | 2022-08-23 | 株式会社シグマ | Imaging optical system | 
| JP7576231B2 (en)* | 2021-04-09 | 2024-10-31 | 株式会社ニコン | Optical systems and optical instruments | 
| Publication number | Publication date | 
|---|---|
| JPH08146297A (en) | 1996-06-07 | 
| Publication | Publication Date | Title | 
|---|---|---|
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| Date | Code | Title | Description | 
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |