JPH07107577B2 - Zoom lenses - Google Patents
Zoom lensesInfo
- Publication number
- JPH07107577B2 JPH07107577B2 JP17272286A JP17272286A JPH07107577B2 JP H07107577 B2 JPH07107577 B2 JP H07107577B2 JP 17272286 A JP17272286 A JP 17272286A JP 17272286 A JP17272286 A JP 17272286A JP H07107577 B2 JPH07107577 B2 JP H07107577B2
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- negative
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Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明はズームレンズに関するもので、ビデオカメラ用
に好ましい構成になつているズームレンズに関するもの
である。The present invention relates to a zoom lens, and more particularly to a zoom lens having a preferable configuration for a video camera.
ビデオカメラは、従来の銀塩スチールカメラに比べて高
価で重量が重いためにそれ程普及していなかつたが、最
近大幅な小型軽量化，低価格化が進み、一般ユーザーに
急速に普及しつつある。特にカメラ部とデツキ部が一体
となつたポータブルなカメラも出はじめている。これは
主に回路系のLSI化が要因となつており、その中の一つ
として撮像デバイスが従来の2/3インチのチユーブから1
/2インチのCCD等の固体撮像素子へ移行したことも一役
買つている。Video cameras were not so popular because they were more expensive and heavier than conventional silver-salt steel cameras, but they have been rapidly becoming popular with general users due to recent significant size reduction, weight reduction, and price reduction. . In particular, portable cameras, which have a camera unit and a deck unit, are beginning to appear. This is mainly due to the fact that the circuit system is made into an LSI, and one of them is that the imaging device is one of the conventional 2 / 3-inch tubes.
The fact that it has moved to a solid-state image sensor such as a 1 / 2-inch CCD also plays a role.
このようにビデオカメラにおいて電気系が大幅にコンパ
クト化，ローコスト化が進むなかでレンズ系の小型軽量
化，低コスト化は電気系ほどは進展していないのが現状
である。特にレンズ系の全長，前玉径の大きさ，構成枚
数の点で不十分である。In this way, in the video camera, the electrical system has become much more compact and the cost has been reduced, but the lens system has not been made smaller, lighter and less costly than the electrical system. In particular, the total length of the lens system, the size of the front lens diameter, and the number of components are insufficient.
1/2インチイメージサイズ用でズーム比が約６倍のズー
ムレンズの従来例として特開昭60−123817号，特開昭60
−126618号，特開昭60−126619号等がある。これら従来
例は、非球面を使用したもので全長の広角端焦点距離が
11.7〜11.8と短く構成枚数も11枚〜12枚と少なく前玉径
も40ミリ近辺で小さく性能も良好である。しかし広角端
でのＦナンバーは、1.33乃至1.45であり1/2インチイメ
ージサイズのCCDではF/1.2クラスの明るさが必要なこと
を考えると物足らない。またこのＦナンバーの割には全
長や前玉径も満足出来る小ささではない。さらに従来の
前玉フオーカシング方式は、重量の大きい前玉を繰り出
すことによつているため、オートフオーカスやパワーフ
オーカスを行なうで電力消費が大になり、また近距離側
において軸外光線のけられが大きく前玉径を大きくしな
い限り近距離側にフオーカスすることが困難である。As a conventional example of a zoom lens having a zoom ratio of about 6 times for a 1/2 inch image size, there are JP-A-60-123817 and JP-A-60.
-126618 and JP-A-60-126619. These conventional examples use aspherical surfaces and have a wide-angle end focal length of the entire length.
It is as short as 11.7 to 11.8, and the number of components is as small as 11 to 12, and the front diameter is also around 40 mm and the performance is good. However, the F-number at the wide-angle end is 1.33 to 1.45, which is unsatisfactory considering that a 1 / 2-inch image size CCD requires F / 1.2 class brightness. Moreover, the total length and the front lens diameter are not small enough for this F number. Furthermore, since the conventional front lens focusing system relies on feeding out a heavy front lens, power consumption is increased by performing auto focus and power focus, and off-axis rays are blocked at the short distance side. It is difficult to focus on the short distance side unless the front lens diameter is increased.
本発明はズーム比が６程度で、広角端のＦナンバーが1.
2程度で、全長の広角端での焦点距離に対する比が11程
度の前玉径が小さく構成枚数が10〜12枚程度のズーム比
の大きい超コンパクトな低コストのズームレンズを提供
することを目的とするものである。In the present invention, the zoom ratio is about 6, and the F number at the wide-angle end is 1.
The objective is to provide an ultra-compact, low-cost zoom lens with a zoom ratio of about 2 and a front lens diameter of about 11 to the focal length at the wide-angle end and a small diameter of the front lens with about 10 to 12 components. It is what
本発明は、前記の目的を達成するために非球面を用いる
と共にリレー系にコンペンセーターとしての役割をもた
せさらにはフオーカシング機能を持たせることも可能に
したものである。即ち本発明のズームレンズは、物体側
から順に負レンズ，正レンズ，正レンズの３枚のレンズ
にて構成され全体として正の焦点距離を有する第１群
と、負レンズ，負レンズ，正レンズの３枚のレンズにて
構成され全体として負の焦点距離を有し変倍時に可動で
あつて主として変倍作用をする第２群と、１枚,2枚又は
３枚のレンズにて構成され全体として正の焦点距離を有
し常時固定であつて射出側でほぼアフオーカルにする役
割をなし非球面を含む第３群と、第３群より少し大きく
空気間隔をあけて負レンズ，正レンズ，正レンズ又は正
レンズ，負レンズ，負レンズの３枚にて構成され全体と
して正の焦点距離を有し変倍時に生ずる焦点位置の変動
をなくすいわゆるコンペンセーターの役割を有すると共
に合焦のために可動である第４群とより構成されてい
る。In order to achieve the above-mentioned object, the present invention makes it possible to use an aspherical surface and to make the relay system function as a compensator and further to have a focusing function. That is, the zoom lens according to the present invention includes a first lens group having a positive focal length as a whole, which includes a negative lens, a positive lens, and a positive lens in order from the object side, and a negative lens, a negative lens, and a positive lens. Is composed of three lenses, has a negative focal length as a whole, is movable during zooming, and is mainly configured to perform zooming, and is composed of one, two, or three lenses. The third lens group, which has a positive focal length as a whole and is always fixed, plays a role of making almost afocal on the exit side, and includes an aspherical surface, and a negative lens, a positive lens with an air gap slightly larger than the third lens group, It consists of three lenses, positive lens or positive lens, negative lens, and negative lens, has a positive focal length as a whole, and has a role of a so-called compensator for eliminating the fluctuation of the focal position caused at the time of zooming and for focusing. The fourth group is movable It is configured.
このように本発明は、焦点位置の移動の補正とフオーカ
シングとは同様のものであることに着目し、変倍時に生
ずる焦点位置の移動の補正と合焦とを僅か３枚のレンズ
にて構成されている第４群のリレーレンズ系に集中して
持たせたことと、第３群固定群の一部に非球面を用いた
ことを特徴とするものである。As described above, in the present invention, focusing on the fact that the correction of the movement of the focal position and the focusing are the same, the correction of the movement of the focal position generated at the time of zooming and the focusing are configured by only three lenses. The present invention is characterized in that the relay lens system of the fourth lens group is provided with a concentrated light and that an aspherical surface is used as a part of the third lens group.
このように群の偏芯による影響のでやすい第１群を固定
することによつて偏芯による性能の劣化を小さくするこ
とが出来、さらにオートフオーカスを採用した場合、こ
れを大きくて重い第１群で行なうのではなく軽量な第４
群で行なうことにより応答性を良好にし、又消費電力を
少なくする等が可能となる。また第１群によるフオーカ
シングの欠点である近距離物点にフオーカシングした時
の軸外光束のけられにより最至近距離をより近くするこ
とが出来ない点や、それを近くするために前玉径を大き
くしなければならない点をこの第４群によるフオーカシ
ング方式を用いることによつて解消し得る。By fixing the first group, which is apt to be affected by the eccentricity of the group, it is possible to reduce the performance deterioration due to the eccentricity. Furthermore, when the autofocus is adopted, the large and heavy first group is used. Lighter than the group 4
By performing them in groups, it is possible to improve the responsiveness and reduce the power consumption. Also, the shortest distance cannot be made closer due to the off-axis light flux when focusing on a short-distance object point, which is a drawback of focusing by the first group, and the front lens diameter is set to make it closer. The need to increase the size can be eliminated by using the focusing method according to the fourth group.
また従来例においては、変倍時の焦点位置の変動の補正
をバリエーターのすぐ次のレンズによつて行なつている
が、本発明においてはこの補正機能をも第４群に併せ持
たせるようにして機能集中型にすることによつて低コス
ト化をはかつている。このように第４群にフオーカシン
グと焦点位置補正機能を集中して持たせることによつて
多くのメリツトが得られる。しかしこれによつて第４群
の移動によつて生ずる収差の変動による結像性能の劣化
を考慮しなければならない。この第４群の移動による収
差変動は、球面収差において著しい。この球面収差の変
動を防ぐには一定の条件が必要である。この条件を示し
たのが次の条件（１）である。Further, in the conventional example, the fluctuation of the focal position at the time of zooming is corrected by the lens immediately following the variator, but in the present invention, this correction function is also provided in the fourth group. The cost has been reduced by making the functions centralized. In this way, many advantages can be obtained by concentrating the focusing and focus position correcting functions in the fourth lens group. However, due to this, it is necessary to consider the deterioration of the imaging performance due to the fluctuation of the aberration caused by the movement of the fourth lens unit. Aberration variation due to the movement of the fourth lens group is remarkable in spherical aberration. Certain conditions are necessary to prevent the fluctuation of the spherical aberration. The following condition (1) shows this condition.
（１）｜fT／fAT｜＜0.6 ただしfTは望遠端における全系の焦点距離、fATは望遠
端における第１群から第３群までの合成焦点距離であ
る。(1) | f T / f AT | <0.6 where f T is the focal length of the entire system at the telephoto end, and f AT is the combined focal length of the first to third lens groups at the telephoto end.
第４群の移動による球面収差の変動を小さくするために
は、この第４群の移動による軸上光線高の変動を少なく
すればよい。つまり第１群から第３群までがほぼアフオ
ーカルになればよい。このアフオーカル度を示したのが
条件（１）である。この条件（１）より外れると望遠端
における球面収差がフオーカシングにより著しく変動す
るので好ましくない。In order to reduce the fluctuation of the spherical aberration due to the movement of the fourth lens unit, the fluctuation of the axial ray height due to the movement of the fourth lens unit may be reduced. That is, it suffices if the first group to the third group become almost aquacal. The condition (1) shows the degree of affaucal. If the condition (1) is not satisfied, spherical aberration at the telephoto end fluctuates remarkably due to focusing, which is not preferable.
本発明のズームレンズは、レンズ構成枚数を10〜12枚に
とどめている。現在実用化されているズームレンズのう
ち最も代表的なズームレンズでは、コンペンセーターと
エレクターとリレーレンズのうちの前群つまり絞りの近
くに配置されているレンズが合わせて６枚のレンズを使
用している。しかし本発明のズームレンズはこれを１枚
〜３枚のレンズにとどめ構成枚数を大幅に削減してい
る。In the zoom lens of the present invention, the number of lens components is limited to 10 to 12. The most representative zoom lens currently in practical use is a compensator, an erector, and a relay lens. ing. However, in the zoom lens of the present invention, this is limited to one to three lenses, and the number of constituent elements is greatly reduced.
従来のズームレンズが前述のように絞りの近辺に６枚も
の多くのレンズを配置したのは、その中にコンペンセー
ターが独立して含まれていることに加えて大口径比を保
ちつつ球面収差を良好に補正しなければならないためで
ある。したがつて本発明のズームレンズのように、この
部分のレンズを大幅に減らして３〜５枚のレンズにて構
成した場合当然球面収差が補正不足になる。In the conventional zoom lens, as many lenses as six lenses are arranged in the vicinity of the diaphragm as described above, in addition to the fact that the compensator is independently included in it, spherical aberration while maintaining a large aperture ratio. This is because it must be corrected well. Therefore, as in the zoom lens of the present invention, when the lens in this portion is greatly reduced to be composed of 3 to 5 lenses, the spherical aberration is naturally undercorrected.
したがつてこの部分のレンズ枚数を大幅に減少させるた
めには、この部分に非球面を導入する必要がある。その
場合に用いる非球面としてはその面が発散面の場合、光
軸上での曲率半径よりも径の外側へ向かうにしたがつて
強い発散力を有する面逆にその面が収斂面である場合
は、光軸上での曲率半径よりも径の外側へ向かうにした
がつて弱い収斂面を有する面にすればよい。このように
することによつて負の大きな球面収差を補正又は緩和す
ることが出来る。Therefore, in order to significantly reduce the number of lenses in this portion, it is necessary to introduce an aspherical surface in this portion. As the aspherical surface used in that case, if the surface is a diverging surface, the surface that has a strong diverging force toward the outside of the radius of curvature on the optical axis is a converging surface. May be a surface having a weaker converging surface along the outer side of the radius of curvature on the optical axis. By doing so, large negative spherical aberration can be corrected or mitigated.
前述のようにズームレンズ系全体としては負の球面収差
が発生しやすい傾向がある。そしてレンズ系全体のうち
第３群の正レンズが特に大きな球面収差を発生する。し
たがつて本発明では後に述べる各実施例のようにこの第
３群中の正レンズに非球面を設けるようにした。又実施
例６のようにこの正レンズの前に球面レンズを設ければ
ベツツバール和の補正にとつて有効である。As described above, negative spherical aberration tends to occur in the entire zoom lens system. The positive lens of the third lens group in the entire lens system produces particularly large spherical aberration. Therefore, in the present invention, the positive lens in the third lens group is provided with an aspherical surface as in each of the embodiments described later. If a spherical lens is provided in front of this positive lens as in the sixth embodiment, it is effective for correcting the Betz-Val sum.
本発明のズームレンズは、以上のようにして従来例では
少なくとも13枚のレンズを必要としていたものを更に減
少させて10枚〜12枚のレンズにて構成ししかも小型軽量
化高性能化を大口径比、高変倍比を保ちながら行ない得
た。更にリアーフオーカスを採用することによつてフオ
ーカシングの軽量化、前群の偏芯量の軽減、クローズア
ツプフオーカシングの容易化も実現したものである。As described above, the zoom lens of the present invention further comprises at least 13 lenses in the conventional example, and is composed of 10 to 12 lenses. It was possible to maintain the aperture ratio and the high zoom ratio. Furthermore, by adopting the rear focus, the weight of focusing is reduced, the eccentricity of the front group is reduced, and the close-up focusing is facilitated.
本発明のズームレンズは、更に次の条件（２）〜条件
（６）を満足せしめることによつてより高性能になし得
る。The zoom lens of the present invention can have higher performance by satisfying the following conditions (2) to (6).
（２）0.53＜（e2W−e2T）／e2W＜0.77 （４）n4T1又はn4T2＞1.55 （５）ν4T1又はν4T2＞45 （６）光軸からの高さｙ＝fIII/4において ただしfWは広角端における全系の合成焦点距離、fTは望
遠端における全系の合成焦点距離、fIIIは第３群の合成
焦点距離、fIVは第４群の合成焦点距離、e2Wは第２群と
第３群の広角端における主点間隔、e2Tは第２群と第３
群の望遠端における主点間隔、n4T1は第４群の物体側か
ら１番目の正レンズの屈折率、n4T2は第４群の物体側か
ら２番目の正レンズの屈折率、ν4T1は第４群の物体側
から１番目の正レンズのアツベ数、ν4T2は第４群の物
体側から２番目の正レンズのアツベ数である。又ΔＸは
上記非球面を光軸方向をｘ軸、これと垂直方向をｙ軸に
し、光軸上での曲率半径をｒとした時に次の式にて表わ
した場合のEy4＋Fy6＋Gy8＋Hy10の値である。(2) 0.53 <(e 2W −e 2T ) / e 2W <0.77 (4) In the n 4T1 or n 4T2> 1.55 (5) ν 4T1 or [nu 4T2> 45 (6) height y = f III / 4 from the optical axis Where f W is the combined focal length of the entire system at the wide-angle end, f T is the combined focal length of the entire system at the telephoto end, f III is the combined focal length of the third group, f IV is the combined focal length of the fourth group, e 2W is the distance between the principal points at the wide-angle end of the second group and the third group, and e 2T is the second group and the third group.
The main point interval at the telephoto end of the group, n 4T1 is the refractive index of the first positive lens from the object side of the fourth group, n 4T2 is the refractive index of the second positive lens from the object side of the fourth group, [nu 4T1 is The Abbbe number of the first positive lens from the object side of the fourth group, ν 4T2 is the Abbé number of the second positive lens from the object side of the fourth group. Further, Δ X is Ey 4 + Fy 6 + Gy in the case of being expressed by the following equation when the above-mentioned aspherical surface has the optical axis direction as the x-axis, the vertical direction as the y-axis, and the radius of curvature on the optical axis is r. It is a value of 8 + Hy 10 .
条件（２）はバリエーターである第２群の可動範囲を規
定したものである。バリエーターの可動範囲を大きくと
る程ズーミングによる収差変動は少なくなり好ましいが
バリエーターのパワーが弱くなる程又バリエーターが第
３群に近づく程全系のペツツバール和が正の大きな値を
とるようになり好ましくない。それは、バリエーターの
負のパワーが弱くなることのほかに第３群，第４群の正
のパワーが強くなるためである。したがつてこの条件
（２）の上限を越えるとペツツバール和が正の大きな値
をとり易く、下限を越えるとバリエーターのパワーが強
くなりズーミングによる収差変動が大きくなり易い。 The condition (2) defines the movable range of the second group which is the variator. The larger the movable range of the variator, the smaller the fluctuation of aberration due to zooming, which is preferable, but the weaker the power of the variator and the closer the variator to the third group, the larger the Petzval sum of the entire system becomes, which is not preferable. . This is because the negative power of the variator becomes weak and the positive power of the third and fourth groups becomes strong. Therefore, when the upper limit of this condition (2) is exceeded, the Petzval sum tends to take a large positive value, and when the lower limit is exceeded, the power of the variator becomes strong and the aberration variation due to zooming tends to increase.
条件（３）は第４群の合成焦点距離を規定したものであ
る。この条件の上限を越えると第４群のレンズ径が増大
しフオーカシング移動量も増大するので好ましくない。
また条件（３）の下限を越えると全系のペツツバール和
が正方向に増大し好ましくない。The condition (3) defines the combined focal length of the fourth lens unit. If the upper limit of this condition is exceeded, the lens diameter of the fourth lens unit increases and the focusing movement amount also increases, which is not preferable.
If the lower limit of the condition (3) is exceeded, the Petzval sum of the entire system will increase in the positive direction, which is not preferable.
条件（４），（５）はフオーカシング群の正レンズの屈
折率とアツベ数を規定したものである。Conditions (4) and (5) define the refractive index and the Abbe number of the positive lens of the focusing group.
条件（４）の下限を越えると負の球面収差や正のペツツ
バール和が増大したりフオーカシングによる球面収差の
変動量が望遠端において大きくなりやすく好ましくな
い。When the value goes below the lower limit of the condition (4), negative spherical aberration and positive Petzval's sum increase, and the amount of fluctuation of spherical aberration due to focusing becomes large at the telephoto end, which is not preferable.
又条件（５）の下限を越えると倍率の色収差が補正不足
になりやすく好ましくない。If the lower limit of the condition (5) is exceeded, chromatic aberration of magnification will be insufficiently corrected, which is not preferable.
条件（６）は第３群に導入した非球面の光軸上での曲率
半径の球面からの偏奇量を規定したものである。先に述
べたように球面系のみの場合負の大きな球面収差になる
ところをこの非球面で補正又は緩和している。The condition (6) defines the amount of deviation of the radius of curvature on the optical axis of the aspherical surface introduced into the third group from the spherical surface. As described above, this aspherical surface corrects or alleviates a large negative spherical aberration in the case of only a spherical system.
条件（６）の下限を越えると球面収差が補正不足になり
やすく、上限を越えると逆に補正過剰になり易くまた非
球面レンズの製造上の偏芯が性能劣化をきたしやすくな
る。If the lower limit of the condition (6) is exceeded, the spherical aberration is likely to be undercorrected, and if the upper limit is exceeded, the overcorrection is likely to occur, and decentering in manufacturing the aspherical lens is likely to cause performance deterioration.
尚本発明のズームレンズは第４群によるリアーフオーカ
スを採用しているが、第４群をコンペンセーターの役割
にのみとどめて、フオーカシングを第１群にて行なうよ
うにすることもできる。Although the zoom lens of the present invention employs the rear focus of the fourth group, it is also possible to limit the function of the fourth group to the role of a compensator and perform focusing by the first group.
次に本発明ズームレンズの各実施例を示す。 Next, examples of the zoom lens of the present invention will be shown.
実施例１ ｆ＝９〜54、F/1.2〜F/1.6、ω＝24.0°〜4.2° r1＝136.4522 d1＝1.2000 n1＝1.78472 ν１＝25.68 r2＝45.5412 d2＝0.4300 r3＝52.0966 d3＝5.2000 n2＝1.60311 ν２＝60.70 r4＝−110.7151 d4＝0.3000 r5＝28.1126 d5＝4.6000 n3＝1.60311 ν３＝60.70 r6＝94.9491 d6＝D1 r7＝32.1699 d7＝1.0000 n4＝1.83400 ν４＝37.16 r8＝11.7760 d8＝4.4000 r9＝−16.2664 d9＝1.0000 n5＝1.69350 ν５＝53.23 r10＝19.2228 d10＝3.0000 n6＝1.84666 ν６＝23.78 r11＝−130.9153 d11＝D2 r12＝∞（絞り） d12＝3.5000 r13＝−188.7770 d13＝2.2000 n7＝1.49216 ν７＝57.50 r14＝−32.2986（非球面） d14＝0.3000 r15＝16.7325 d15＝3.2000 n8＝1.69680 ν８＝55.52 r16＝25.4294 d16＝D3 r17＝122.5929 d17＝1.0500 n9＝1.84666 ν９＝23.78 r18＝15.8541 d18＝0.3000 r19＝17.2257 d19＝5.7000 n10＝1.69680 ν10＝55.52 r20＝−43.0442 d20＝0.1500 r21＝21.0260 d21＝3.0000 n11＝1.69680 ν11＝55.52 r22＝102.2181 d22＝D4 r23＝∞ d23＝5.5500 n12＝1.51633 ν12＝64.15 r24＝∞ r14の非球面係数 Ｂ＝０、Ｅ＝0.19065×10-4、 Ｆ＝0.18593×10-7、Ｇ＝0.86718×10-9 Ｈ＝−0.20441×10-11、 fT／fAT＝0.3989、（e2W−e2T）／e2W＝0.5851 n4T2＝1.69680 n4T3＝1.69680、ν4T2＝55.52、ｙ＝6.447 ν4T3＝55.52、 実施例２ ｆ＝8.5〜51、F/1.2〜F/1.4、ω＝25.2°〜4.5° r1＝130.1757 d1＝1.2000 n1＝1.80518 ν１＝25.43 r2＝46.8946 d2＝0.4500 r3＝54.0384 d3＝5.7000 n2＝1.60311 ν２＝60.70 r4＝−105.5816 d4＝0.2000 r5＝29.1893 d5＝4.6000 n3＝1.60311 ν３＝60.70 r6＝94.3091 d6＝D1 r7＝25.8482 d7＝1.0000 n4＝1.83400 ν４＝37.16 r8＝11.2014 d8＝4.6000 r9＝−15.1580 d9＝1.0000 n5＝1.69350 ν５＝53.23 r10＝15.7923 d10＝3.1000 n6＝1.84666 ν６＝23.78 r11＝−838.4934 d11＝D2 r12＝∞（絞り） d12＝1.5000 r13＝18.8920（非球面） d13＝5.4000 n7＝1.51728 ν７＝69.56 r14＝−96.3186 d14＝D3 r15＝235.4475 d15＝1.2000 n8＝1.84666 ν８＝23.78 r16＝19.3020 d16＝0.4200 r17＝22.2480 d17＝4.6000 n9＝1.72916 ν９＝54.68 r18＝−38.6677 d18＝0.1500 r19＝20.9264 d19＝5.4000 n10＝1.72916 ν10＝54.68 r20＝50.5497 d20＝D4 r21＝∞ d21＝5.5500 n11＝1.51633 ν11＝64.15 r22＝∞ r13の非球面係数 Ｂ＝０、Ｅ＝−0.19894×10-4 Ｆ＝−0.39811×10-6、Ｇ＝0.43252×10-8 Ｈ＝−0.16404×10-10 fT／fAT＝0.3727、（e2W−e2T）／e2W＝0.6178 n4T2＝1.72916 n4T3＝1.72916、ν4T2＝54.68 ν4T3＝54.68、ｙ＝6.983 実施例３ ｆ＝8.5〜51、F/1.2〜F/1.4、ω＝25.2°〜4.5° r1＝128.1179 d1＝1.2000 n1＝1.80518 ν１＝25.43 r2＝46.5119 d2＝0.4500 r3＝53.1820 d3＝5.7000 n2＝1.60311 ν２＝60.70 r4＝−105.7320 d4＝0.2000 r5＝28.6610 d5＝4.6000 n3＝1.60311 ν３＝60.70 r6＝86.8570 d6＝D1 r7＝24.2229 d7＝1.0000 n4＝1.83400 ν４＝37.16 r8＝10.8691 d8＝4.6000 r9＝−15.0869 d9＝1.0000 n5＝1.69350 ν５＝53.23 r10＝15.9116 d10＝3.1000 n6＝1.84666 ν６＝23.78 r11＝−2549.8318 d11＝D2 r12＝∞（絞り） d12＝1.5000 r13＝22.1812（非球面） d13＝5.4000 n7＝1.72916 ν７＝54.68 r14＝−110.7192 d14＝0.5000 r15＝79.6360 d15＝1.0000 n8＝1.80518 ν８＝25.43 r16＝47.6688 d16＝D3 r17＝224.7020 d17＝1.2000 n9＝1.84666 ν９＝23.78 r18＝18.9080 d18＝0.3000 r19＝21.4060 d19＝4.6000 n10＝1.72916 ν10＝54.68 r20＝−52.2858 d20＝0.1500 r21＝22.1507 d21＝5.4000 n11＝1.72916 ν11＝54.68 r22＝141.6138 d22＝D4 r23＝∞ d23＝5.5500 n12＝1.51633 ν12＝64.15 r24＝∞ r13の非球面係数 Ｂ＝０、Ｅ＝0.17403×10-4 Ｆ＝−0.72256×10-7、Ｇ＝0.70790×10-9 Ｈ＝−0.26270×10-11 fT／fAT＝0.3724、（e2W−e2T）／e2W＝0.6342 n4T2＝1.72916 n4T3＝1.72916、ν4T2＝54.68 ν4T3＝54.68、ｙ＝7.513 実施例４ ｆ＝９〜54、F/1.2〜F/1.6、ω＝24.0°〜4.2° r1＝105.8705 d1＝1.2000 n1＝1.78472 ν１＝25.68 r2＝40.4395 d2＝0.5500 r3＝46.8292 d3＝6.3000 n2＝1.60311 ν２＝60.70 r4＝−73.5457 d4＝0.3000 r5＝23.6316 d5＝4.0000 n3＝1.60311 ν３＝60.70 r6＝43.7477 d6＝D1 r7＝28.0453 d7＝1.0000 n4＝1.83400 ν４＝37.16 r8＝11.2710 d8＝4.2000 r9＝−13.8917 d9＝1.0000 n5＝1.69350 ν５＝53.23 r10＝15.7009 d10＝3.0000 n6＝1.84666 ν６＝23.78 r11＝825.0468 d11＝D2 r12＝∞（絞り） d12＝2.5000 r13＝298.9361 d13＝3.8000 n7＝1.69680 ν７＝55.52 r14＝−25.6723 d14＝0.3000 r15＝11.6132（非球面） d15＝4.2000 n8＝1.49216 ν８＝57.50 r16＝17.2213 d16＝4.0000 r17＝−32.6196 d17＝1.0000 n9＝1.80518 ν９＝25.43 r18＝−517.4649 d18＝D3 r19＝70.1106 d19＝1.0500 n10＝1.84666 ν10＝23.78 r20＝16.3288 d20＝0.8000 r21＝22.9930 d21＝4.3000 n11＝1.69680 ν11＝55.52 r22＝−63.0904 d22＝0.1500 r23＝20.0540 d23＝4.4000 n12＝1.69680 ν12＝55.52 r24＝−117.5507 d24＝D4 d25＝∞ d25＝5.5500 n13＝1.51633 ν13＝64.15 r26＝∞ r15の非球面係数 Ｂ＝０、Ｅ＝−0.16980×10-4 Ｆ＝−0.22166×10-6、Ｇ＝0.13650×10-8 Ｈ＝−0.18169×10-10 fT／fAT＝0.3050、（e2W−e2T）／e2W＝0.6930 n4T2＝1.69680 n4T3＝1.69680、ν4T2＝55.52 ν4T3＝55.52、ｙ＝7.1515 実施例５ ｆ＝９〜54、F/1.2〜F/1.6、ω＝24.0°〜4.2° r1＝108.1833 d1＝1.2000 n1＝1.78472 ν１＝25.68 r2＝43.4391 d2＝0.7300 r3＝54.1589 d3＝6.2000 n2＝1.60311 ν２＝60.70 r4＝−74.8773 d4＝0.2500 r5＝24.6775 d5＝3.8000 n3＝1.60311 ν３＝60.70 r6＝42.2293 d6＝D1 r7＝36.4655 d7＝1.0000 n4＝1.83400 ν４＝37.16 r8＝12.5593 d8＝4.3000 r9＝−15.2604 d9＝1.0000 n5＝1.69350 ν５＝53.23 r10＝20.9528 d10＝2.7000 n6＝1.84666 ν６＝23.78 r11＝−96.7933 d11＝D2 r12＝∞（絞り） d12＝4.0000 r13＝18.1716 d13＝4.4000 n7＝1.69680 ν７＝55.52 r14＝126.5183（非球面） d14＝1.2500 r15＝−235.3575 d15＝1.0000 n8＝1.80518 ν８＝25.43 r16＝75.4923 d16＝D3 r17＝293.7727 d17＝3.2000 n9＝1.77250 ν９＝49.66 r18＝−31.7027 d18＝0.1500 r19＝22.0291 d19＝6.9000 n10＝1.56873 ν10＝63.16 r20＝−16.1350 d20＝1.0000 n11＝1.80518 ν11＝25.43 r21＝−305.8576 d21＝D4 r22＝∞ d22＝5.5500 n12＝1.51633 ν12＝64.15 r23＝∞ r14の非球面係数 Ｂ＝０、Ｅ＝0.32548×10-4 Ｆ＝−0.51728×10-7、Ｇ＝0.97062×10-9 Ｈ＝−0.46200×10-11 fT／fAT＝0.1256、（e2W−e2T）／e2W＝0.6895 n4T1＝1.77250 n4T2＝1.56873、ν4T1＝49.66 ν4T2＝63.16、ｙ＝11.6455 実施例６ ｆ＝９〜54、F/1.2〜F/1.6、ω＝24.0°〜4.2° r1＝110.7213 d1＝1.2000 n1＝1.78472 ν１＝25.68 r2＝42.8471 d2＝0.8000 r3＝53.8324 d3＝6.2000 n2＝1.60311 ν２＝60.70 r4＝−71.6879 d4＝0.2500 r5＝24.0417 d5＝4.0500 n3＝1.60311 ν３＝60.70 r6＝41.7658 d6＝D1 r7＝36.8293 d7＝1.0000 n4＝1.83400 ν４＝37.16 r8＝12.3933 d8＝4.3000 r9＝−14.7862 d9＝1.0000 n5＝1.69350 ν４＝53.23 r10＝21.0272 d10＝2.7000 n6＝1.84666 ν６＝23.78 r11＝−97.7741 d11＝D2 r12＝37.9953 d12＝1.3000 n7＝1.49216 ν７＝57.50 r13＝27.7833 d13＝4.6000 r14＝∞（絞り） d14＝3.0000 r15＝18.2296 d15＝5.1000 n8＝1.69680 ν８＝55.52 r16＝418.6369（非球面） d16＝1.2000 r17＝−190.6035 d17＝1.0000 n9＝1.80518 ν９＝25.43 r18＝107.8231 d18＝D3 r19＝−401.8114 d19＝3.1000 n10＝1.77250 ν10＝49.66 r20＝−29.7770 d20＝0.1500 r21＝20.1366 d21＝6.9000 n11＝1.56873 ν11＝63.16 r22＝−15.5800 d22＝1.0000 n12＝1.80518 ν12＝25.43 r23＝−632.9448 d23＝D4 r24＝∞ d24＝5.5500 n13＝1.51633 ν13＝64.15 r25＝∞ r16の非球面係数 Ｂ＝０、Ｅ＝0.35082×10-4 Ｆ＝−0.12934×10-6、Ｇ＝0.18842×10-8 Ｈ＝−0.77299×10-11 fT／fAT＝0.1580、（e2W−e2T）／e2W＝0.6555 n4T1＝1.77250 n4T2＝1.56873、ν4T1＝49.66 ν4T2＝63.16、ｙ＝10.9365 実施例７ ｆ＝９〜54、F/1.2〜F/1.6、ω＝24.0°〜4.2° r1＝81.1943 d1＝1.2000 n1＝1.84666 ν１＝23.78 r2＝41.3496 d2＝1.0000 r3＝54.2560 d3＝6.0000 n2＝1.60311 ν２＝60.70 r4＝−73.0831 d4＝0.1500 r5＝23.2215 d5＝3.6000 n3＝1.60311 ν３＝60.70 r6＝36.7678 d6＝D1 r7＝40.1769 d7＝1.0000 n4＝1.83400 ν４＝37.16 r8＝12.9522 d8＝4.6000 r9＝−15.4899 d9＝1.0000 n5＝1.69350 ν４＝53.23 r10＝23.5602 d10＝2.7000 n6＝1.84666 ν６＝23.78 r11＝−116.1034 d11＝D2 r12＝∞（絞り） d12＝1.5000 r13＝20.4629（非球面） d13＝3.6000 n7＝1.51728 ν７＝69.56 r14＝279.8324 d14＝D3 r15＝29.6757 d15＝4.5000 n8＝1.69680 ν８＝55.52 r16＝−45.8108 d16＝0.1500 r17＝21.7633 d17＝5.7000 n9＝1.56873 ν９＝63.16 r18＝−18.5093 d13＝1.0000 n10＝1.84666 ν10＝23.78 r19＝62.6025 d10＝D4 r20＝∞ d23＝5.5500 n11＝1.51633 ν11＝64.15 r21＝∞ r13の非球面係数 Ｂ＝０、Ｅ＝−0.29540×10-4 Ｆ＝0.22548×10-5、Ｇ＝−0.35008×10-5 Ｈ＝0.14454×10-10 fT／fTA＝0.1639、（e2W−e2T）／e2W＝0.6659 n4T1＝1.69680 n4T2＝1.56873、ν4T1＝55.52 ν4T2＝63.16、ｙ＝10.6198 実施例８ ｆ＝９〜54、F/1.2〜F/1.6、ω＝24.0°〜4.2° r1＝113.4947 d1＝1.2000 n1＝1.78472 ν１＝25.68 r2＝42.8581 d2＝0.5000 r3＝49.2608 d3＝6.2000 n2＝1.60311 ν２＝60.70 r4＝−81.1903 d4＝0.2500 r5＝24.9378 d5＝4.0500 n3＝1.60311 ν３＝60.70 r6＝48.4677 d6＝D1 r7＝32.0153 d7＝1.0000 n4＝1.83400 ν４＝37.17 r8＝11.6817 d8＝4.6000 r9＝−14.4459 d9＝1.0000 n5＝1.69350 ν５＝53.23 r10＝18.9976 d10＝2.7000 n6＝1.84666 ν６＝23.78 r11＝−130.4590 d11＝D2 r12＝∞（絞り） d12＝1.0000 r13＝30.2067 d13＝1.3000 n7＝1.69895 ν７＝30.12 r14＝18.4716 d14＝1.5000 r15＝16.4313（非球面） d15＝5.0000 n8＝1.69680 ν８＝55.52 r16＝309.6987 d16＝D3 r17＝−70.3155 d17＝2.7000 n9＝1.77250 ν９＝49.66 r18＝−27.3036 d18＝0.1500 r19＝19.6565 d19＝7.3000 n10＝1.56873 ν10＝63.16 r20＝−14.1118 d20＝1.000 n11＝1.80518 ν11＝25.43 r21＝−148.9617 d21＝D4 r22＝∞ d22＝5.5500 n12＝1.51633 ν12＝64.15 r23＝∞ r15の非球面係数 Ｂ＝０、Ｅ＝−0.25317×10-4 Ｆ＝0.14214×10-7、Ｇ＝−0.64436×10-9 Ｈ＝0.84177×10-12 fT／fAT＝0.2382、（e2W−e2T）／e2W＝0.6065 n4T1＝1.77250 n4T2＝1.56873、ν4T1＝49.66 ν4T2＝63.16、ｙ＝9.4520 ただしr1，r2，…はレンズ各面の曲率半径、d1，d2，…
は各レンズの肉厚およびレンズ間隔、n1，n2，…は各レ
ンズの屈折率、ν１，ν２，…は各レンズのアツベ数で
ある。Example 1 f = 9 to 54, F / 1.2 to F / 1.6, ω = 24.0 ° to 4.2 ° r 1 = 13.64522 d 1 = 1.2000 n 1 = 1.78472 ν 1 = 25.68 r 2 = 45.5412 d 2 = 0.4300 r 3 ＝ 52.0966 d 3 ＝ 5.2000 n 2 ＝ 1.60311 ν 2 ＝ 60.70 r 4 ＝ －110.7151 d 4 ＝ 0.3000 r 5 ＝ 28.1126 d 5 ＝ 4.6000 n 3 ＝ 1.60311 ν 3 ＝ 60.70 r 6 ＝ 94.9491 d 6 ＝ D 1 r 7 ＝ 32.1699 d 7 = 1.0000 n 4 = 1.83400 ν 4 ＝ 37.16 r 8 = 11.7760 d 8 ＝ 4.4000 r 9 ＝ −16.2664 d 9 = 1.0000 n 5 = 1.69350 ν 5 ＝ 53.23 r 10 = 19.2228 d 10 ＝ 3.0000 n 6 ＝ 1.84666 ν 6 = 23.78 r 11 = -130.9153 d 11 = D 2 r 12 = ∞ (aperture) d 12 = 3.5000 r 13 = -188.7770 d 13 = 2.2000 n 7 = 1.49216 v 7 = 57.50 r 14 = -32.2986 (non Spherical surface) d 14 = 0.3000 r 15 = 16.7325 d 15 ＝ 3.200 n 8 = 1.69680 ν 8 ＝ 55.52 r 16 ＝ 25.4294 d 16 ＝ D 3 r 17 ＝ 122.5929 d 17 ＝ 1.0500 n 9 ＝ 1.84666 ν 9 ＝ 23.78 r 18 ＝ 15.8541 d 18 = 0.3000 r 19 = 17.2257 d 19 = 5.7000 n 10 = 1.69680 ν 10 = 55.52 r 20 = −43.0442 d 20 ＝ 0.1500 r 21 ＝ 21.0260 d 21 ＝ 3.0000 n 11 ＝ 1.69680 ν 11 ＝ 55.52 r 22 ＝ 102.2181 d 22 ＝ D 4 r 23 ＝ ∞ d 23 ＝ 5.5500 n 12 ＝ 1.51633 ν 12 ＝ 64.15 r 24 ＝ ∞ Aspherical coefficient of r 14 B = 0, E = 0.19065 × 10 −4 , F = 0.18593 × 10 −7 , G = 0.86718 × 10 −9 H = −0.20441 × 10 −11 , f T / f AT = 0.3989, (E 2W −e 2T ) / e 2W = 0.5851 n 4T2 = 1.69680 n 4T3 = 1.69680, ν 4T2 = 55.52, y = 6.447 ν 4T3 = 55.52, Example 2 f = 8.5 to 51, F / 1.2 to F / 1.4, ω = 25.2 ° to 4.5 ° r 1 = 1300.1757 d 1 = 1.2000 n 1 = 1.80518 ν 1 ＝ 25.43 r 2 ＝ 46.8946 d 2 ＝ 0.4500 r 3 ＝ 54.0384 d 3 ＝ 5.7000 n 2 ＝ 1.60311 ν 2 ＝ 60.70 r 4 ＝ －105.5816 d 4 ＝ 0.2000 r 5 ＝ 29.1893 d 5 ＝ 4.6000 n 3 ＝ 1.60311 ν 3 ＝ 60.70 r 6 ＝ 94.3091 d 6 ＝ D 1 r 7 ＝ 25.8482 d 7 = 1.0000 n 4 ＝ 1.83400 ν 4 ＝ 37.16 r 8 ＝ 11.2014 d 8 ＝ 4.6000 r 9 ＝ −15.1580 d 9 ＝ 1.0000 n 5 ＝ 1.69350 ν 5 ＝ 53.23 r 10 = 15.7923 d 10 ＝ 3.1000 n 6 ＝ 1.84666 ν 6 = 23.78 r 11 = -838.4934 d 11 = D 2 r 12 = ∞ (aperture) d 12 = 1.5000 r 13 = 18.8920 (aspheric) d 13 = 5.4000 n 7 = 1.57 28 ν 7 = 69.56 r 14 =- 96.3186 d 14 ＝ D 3 r 15 ＝ 235.4475 d 15 = 1.2000 n 8 = 1.84666 ν 8 ＝ 23.78 r 16 ＝ 19.3020 d 16 ＝ 0.4200 r 17 ＝ 22.2480 d 17 ＝ 4.6000 n 9 ＝ 1.72916 ν 9 ＝ 54.68 r 18 ＝ － 38.6677 d 18 = 0.1500 r 19 = 20.9264 d 19 = 5.4000 n 10 = 1.72916 ν 10 = 54.68 r 20 = 50.5497 d 20 ＝ D 4 r 21 ＝ ∞ d 21 ＝ 5.5500 n 11 ＝ 1.51633 ν 11 ＝ 64.15 r 22 ＝ ∞ Aspherical coefficient of r 13 B = 0, E = −0.19894 × 10 −4 F = −0.39811 × 10 −6 , G = 0.43252 × 10 −8 H = −0.16404 × 10 −10 f T / f AT = 0.3727, (E 2W −e 2T ) / e 2W = 0.6178 n 4T2 = 1.72916 n 4T3 = 1.72916, ν 4T2 = 54.68 ν 4T3 = 54.68, y = 6.983 Example 3 f = 8.5 to 51, F / 1.2 to F / 1.4, ω = 25.2 ° to 4.5 ° r 1 = 12.81.1179 d 1 = 1.2000 n 1 = 1.80518 ν 1 ＝ 25.43 r 2 ＝ 46.5119 d 2 ＝ 0.4500 r 3 ＝ 53.1820 d 3 ＝ 5.7000 n 2 ＝ 1.60311 ν 2 ＝ 60.70 r 4 ＝ －105.7320 d 4 ＝ 0.2000 r 5 ＝ 28.6610 d 5 ＝ 4.6000 n 3 ＝ 1.60311 ν 3 ＝ 60.70 r 6 ＝ 86.8570 d 6 ＝ D 1 r 7 ＝ 24.2229 d 7 = 1.0000 n 4 = 1.83400 ν 4 ＝ 37.16 r 8 ＝ 10.8691 d 8 ＝ 4.6000 r 9 ＝ -15.0869 d 9 = 1.0000 n 5 = 1.69350 ν 5 ＝ 53.23 r 10 = 15.9116 d 10 ＝ 3.1000 n 6 ＝ 1.84666 ν 6 = 23.78 r 11 = -2549.8318 d 11 = D 2 r 12 = ∞ (aperture) d 12 = 1.5000 r 13 = 22.1812 (aspherical surface) d 13 = 5.4000 n 7 = 1.72916 ν 7 = 54.68 r 14 =- 110.7192 d 14 ＝ 0.5000 r 15 ＝ 79.6360 d 15 = 1.0000 n 8 = 1.80518 ν 8 ＝ 25.43 r 16 ＝ 47.6688 d 16 ＝ D 3 r 17 ＝ 224.7020 d 17 = 1.2000 n 9 ＝ 1.84666 ν 9 ＝ 23.78 r 18 ＝ 18.9080 d 18 = 0.3000 r 19 = 21.4060 d 19 = 4.6000 n 10 = 1.72916 ν 10 = 54.68 r 20 = −52.2858 d 20 = 0.1500 r 21 = 22.1507 d 21 = 5.4000 n 11 = 1.72916 ν 11 = 54.68 r 22 = 141.6138 d 22 = D 4 r 23 = ∞ d 23 = 5.5500 n 12 = 1.51633 ν 12 = 64.15 r 24 = ∞ Aspherical coefficient of r 13 B = 0, E = 0.17403 × 10 −4 F = −0.72256 × 10 −7 , G = 0.70790 × 10 −9 H = −0.26270 × 10 −11 f T / f AT = 0.3724, ( e 2W −e 2T ) / e 2W = 0.6342 n 4T2 = 1.72916 n 4T3 = 1.72916, ν 4T2 = 54.68 ν 4T3 = 54.68, y = 7.513 Example 4 f = 9 to 54, F / 1.2 to F / 1.6, ω = 24.0 ° to 4.2 ° r 1 ＝ 105.8705 d 1 = 1.2000 n 1 = 1.78472 ν 1 ＝ 25.68 r 2 ＝ 40.4395 d 2 ＝ 0.5500 r 3 ＝ 46.8292 d 3 ＝ 6.3000 n 2 ＝ 1.60311 ν 2 ＝ 60.70 r 4 ＝ －73.5457 d 4 ＝ 0.3000 r 5 ＝ 23.6316 d 5 ＝ 4.0000 n 3 ＝ 1.60311 ν 3 ＝ 60.70 r 6 ＝ 43.7477 d 6 ＝ D 1 r 7 ＝ 28.0453 d 7 = 1.0000 n 4 = 1.83400 ν 4 ＝ 37.16 r 8 = 11.2710 d 8 ＝ 4.2000 r 9 ＝ -13.8917 d 9 = 1.0000 n 5 = 1.69350 ν 5 ＝ 53.23 r 10 = 15.700 9 d 10 ＝ 3.0000 n 6 ＝ 1.84666 ν 6 ＝ 23.78 r 11 ＝ 825.0468 d 11 ＝ D 2 r 12 ＝ ∞ (aperture) d 12 ＝ 2.5000 r 13 ＝ 298.9361 d 13 ＝ 3.8000 n 7 ＝ 1.69680 ν 7 ＝ 55.52 r 14 ＝ −25.6723 d 14 = 0.3000 r 15 = 11.6132 (aspherical) d 15 = 4.2000 n 8 = 1.49216 ν 8 = 57.50 r 16 = 17.2213 d 16 = 4.0000 r 17 = -32.6196 d 17 = 1.0000 n 9 = 1.80518 ν 9 = 25.43 r 18 = -517.4649 d 18 = D 3 r 19 = 70.1106 d 19 = 1.0500 n 10 = 1.84666 ν 10 = 23.78 r 20 = 16.3288 d 20 ＝ 0.8000 r 21 ＝ 22.9930 d 21 ＝ 4.3000 n 11 ＝ 1.69680 ν 11 ＝ 55.52 r 22 ＝ －63.0904 d 22 ＝ 0.1500 r 23 ＝ 20.0540 d 23 ＝ 4.4000 n 12 ＝ 1.69680 ν 12 ＝ 55.52 r 24 ＝ －117.5507 d 24 ＝ D 4 d 25 ＝ ∞ d 25 ＝ 5.5500 n 13 ＝ 1.51633 ν 13 ＝ 64.15 r 26 ＝ ∞ Aspherical coefficient of r 15 B = 0, E = −0.16980 × 10 −4 F = −0.22166 × 10 −6 , G = 0.13650 × 10 −8 H = −0.18169 × 10 −10 f T / f AT = 0.3050, (E 2W −e 2T ) / e 2W = 0.6930 n 4T2 = 1.9680 n 4T3 = 1.69680, ν 4T2 ＝ 55.52 ν 4T3 ＝ 55.52, y ＝ 7.1515 Example 5 f = 9~54, F / 1.2~F / 1.6, ω = 24.0 ° ~4.2 ° r 1 = 108.1833 d 1 = 1.2000 n 1 = 1.78472 ν 1 = 25.68 r 2 = 43.4391 d 2 = 0.7300 r 3 ＝ 54.1589 d 3 ＝ 6.2000 n 2 = 1.60311 ν 2 ＝ 60.70 r 4 ＝ －74.8773 d 4 ＝ 0.2500 r 5 ＝ 24.6775 d 5 ＝ 3.8000 n 3 ＝ 1.60311 ν 3 ＝ 60.70 r 6 ＝ 42.2293 d 6 ＝ D 1 r 7 ＝ 36.4655 d 7 = 1.0000 n 4 = 1.83400 ν 4 ＝ 37.16 r 8 = 12.559 3 d 8 ＝ 4.3000 r 9 ＝ −15.2604 d 9 = 1.0000 n 5 = 1.69350 ν 5 ＝ 53.23 r 10 ＝ 20.9528 d 10 ＝ 2.7000 n 6 ＝ 1.84666 ν 6 ＝ 23.78 r 11 ＝ −96.7933 d 11 ＝ D 2 r 12 ＝ ∞ (aperture) d 12 ＝ 4.0000 r 13 ＝ 18.1716 d 13 ＝ 4.4000 n 7 ＝ 1.69680 ν 7 ＝ 55.52 r 14 ＝ 126.5183 (aspheric) d 14 = 1.2500 r 15 = −235.3575 d 15 = 1.0000 n 8 = 1.80518 ν 8 ＝ 25.43 r 16 ＝ 75.4923 d 16 ＝ D 3 r 17 ＝ 293.7727 d 17 ＝ 3.2000 n 9 = 1.77250 ν 9 ＝ 49.66 r 18 ＝ － 31.7027 d 18 = 0.1500 r 19 = 22.0291 d 19 = 6.9000 n 10 = 1.56873 ν 10 = 63.16 r 20 = -16.1350 d 20 = 1.0000 n 11 = 1.80518 ν 11 ＝ 25.43 r 21 ＝ −305.8576 d 21 ＝ D 4 r 22 ＝ ∞ d 22 ＝ 5.5500 n 12 ＝ 1.51633 ν 12 ＝ 64.15 r 23 ＝ ∞ Aspherical coefficient of r 14 B = 0, E = 0.32548 × 10 −4 F = −0.51728 × 10 −7 , G = 0.97062 × 10 −9 H = −0.46200 × 10 −11 f T / f AT = 0.1256, ( e 2W −e 2T ) / e 2W = 0.6895 n 4T1 = 1.77250 n 4T2 = 1.56873 , ν 4T1 = 49.66 ν 4T2 = 63.16, y = 11.6455 Example 6 f = 9 to 54, F / 1.2 to F / 1.6, ω = 24.0 ° to 4.2 ° r 1 = 1110.7213 d 1 = 1.2000 n 1 = 1.78472 ν 1 ＝ 25.68 r 2 ＝ 42.8471 d 2 = 0.8000 r 3 ＝ 53.8324 d 3 ＝ 6.2000 n 2 ＝ 1.60311 ν 2 ＝ 60.70 r 4 ＝ －71.6879 d 4 ＝ 0.2500 r 5 ＝ 24.0417 d 5 ＝ 4.0500 n 3 ＝ 1.60311 ν 3 ＝ 60.70 r 6 ＝ 41.7658 d 6 ＝ D 1 r 7 ＝ 36.8293 d 7 = 1.0000 n 4 = 1.83400 ν 4 ＝ 37.16 r 8 = 12.3933 d 8 ＝ 4.3000 r 9 ＝ －14.7862 d 9 = 1.0000 n 5 = 1.69350 ν 4 ＝ 53.23 r 10 ＝ 21.0272 d 10 ＝ 2.7000 n 6 ＝ 1.84666 ν 6 ＝ 23.78 r 11 ＝ －97.7741 d 11 ＝ D 2 r 12 ＝ 37.9953 d 12 ＝ 1.3000 n 7 ＝ 1.49216 ν 7 ＝ 57.50 r 13 ＝ 27.7833 d 13 ＝ 4.6000 r 14 ＝ ∞ (aperture) d 14 ＝ 3.0000 r 15 = 18.2296 d 15 = 5.1000 n 8 = 1.69680 ν 8 = 55.52 r 16 = 418.6369 ( aspherical) d 16 = 1.2000 r 17 = -190.6035 d 17 = 1.0000 n 9 = 1.80518 ν 9 = 25.43 r 18 = 107.8231 d 18 = D 3 r 19 = -401.8114 d 19 = 3.1000 n 10 = 1.77250 ν 10 = 49.66 r 20 = -29.7770 d 20 = 0.1500 r 21 = 20.1366 d 21 = 6.9000 n 11 = 1.56873 ν 11 = 63.16 r 22 = -15.5800 d 22 = 1.0000 n 12 = 1.80518 ν 12 = 25.43 r 23 = -632.9448 d 23 = D 4 r 24 = ∞ d 24 = 5.5500 n 13 = 1.51633 ν 13 = 64.15 r 25 = ∞ Aspherical coefficient of r 16 B = 0, E = 0.35082 × 10 −4 F = −0.12934 × 10 −6 , G = 0.18842 × 10 −8 H = −0.77299 × 10 −11 f T / f AT = 0.1580, ( e 2W −e 2T ) / e 2W = 0.6555 n 4T1 = 1.77250 n 4T2 = 1.56873 , ν 4T1 = 49.66 ν 4T2 = 63.16, y = 10.9365 Example 7 f = 9 to 54, F / 1.2 to F / 1.6, ω = 24.0 ° to 4.2 ° r 1 = 81.1943 d 1 = 1.2000 n 1 = 1.84666 ν 1 ＝ 23.78 r 2 = 14.13496 d 2 = 1.0000 r 3 ＝ 54.2560 d 3 ＝ 6.0000 n 2 = 1.60311 ν 2 ＝ 60.70 r 4 ＝ －73.0831 d 4 ＝ 0.1500 r 5 ＝ 23.2215 d 5 ＝ 3.6000 n 3 ＝ 1.60311 ν 3 ＝ 60.70 r 6 ＝ 36.7678 d 6 ＝ D 1 r 7 ＝ 40.1769 d 7 = 1.0000 n 4 = 1.83400 ν 4 ＝ 37.16 r 8 = 12.9522 d 8 ＝ 4.6000 r 9 ＝ -15.4899 d 9 = 1.0000 n 5 ＝ 1.69350 ν 4 ＝ 53.23 r 10 ＝ 23.5602 d 10 ＝ 2.7000 n 6 ＝ 1.84666 ν 6 ＝ 23.78 r 11 ＝ －116.1034 d 11 ＝ D 2 r 12 ＝ ∞ (aperture) d 12 ＝ 1.5000 r 13 ＝ 20.4629 (aspherical surface) d 13 ＝ 3.6000 n 7 ＝ 1.51728 ν 7 ＝ 69.56 r 14 ＝ 279.8324 d 14 = D 3 r 15 ＝ 29.6757 d 15 ＝ 4.5000 n 8 = 1.69680 ν 8 ＝ 55.52 r 16 ＝ －45.8108 d 16 ＝ 0.1500 r 17 ＝ 21.7633 d 17 ＝ 5.7000 n 9 ＝ 1.56873 ν 9 ＝ 63.16 r 18 ＝ － 18.5093 d 13 = 1.0000 n 10 = 1.84666 ν 10 ＝ 23.78 r 19 ＝ 62.6025 d 10 ＝ D 4 r 20 ＝ ∞ d 23 ＝ 5.550 0 n 11 = 1.51633 ν 11 = 64.15 r 21 = ∞ Aspherical coefficient of r 13 B = 0, E = −0.29540 × 10 −4 F = 0.22548 × 10 −5 , G = −0.35008 × 10 −5 H = 0.14454 × 10 −10 f T / f TA = 0.1639, ( e 2W −e 2T ) / e 2W = 0.6659 n 4T1 = 1.69680 n 4T2 = 1.56873 , ν 4T1 = 55.52 ν 4T2 = 63.16, y = 10.6198 Example 8 f = 9 to 54, F / 1.2 to F / 1.6, ω = 24.0 ° to 4.2 ° r 1 = 1113.4947 d 1 = 1.2000 n 1 = 1.84772 ν 1 ＝ 25.68 r 2 ＝ 42.8581 d 2 = 0.5000 r 3 ＝ 49.2608 d 3 ＝ 6.2000 n 2 ＝ 1.60311 ν 2 ＝ 60.70 r 4 ＝ －81.1903 d 4 ＝ 0.2500 r 5 ＝ 24.9378 d 5 ＝ 4.0500 n 3 ＝ 1.60311 ν 3 ＝ 60.70 r 6 ＝ 48.4677 d 6 ＝ D 1 r 7 ＝ 32.0153 d 7 = 1.0000 n 4 = 1.83400 ν 4 ＝ 37.17 r 8 = 11.6817 d 8 ＝ 4.6000 r 9 ＝ -14.4459 d 9 = 1.0000 n 5 = 1.69350 ν 5 ＝ 53.23 r 10 = 18.99976 d 10 ＝ 2.7000 n 6 ＝ 1.84666 ν 6 ＝ 23.78 r 11 ＝ －130.4590 d 11 ＝ D 2 r 12 ＝ ∞ (aperture) d 12 ＝ 1.0000 r 13 ＝ 30.2067 d 13 = 1.3000 n 7 ＝ 1.69895 ν 7 ＝ 30.12 r 14 = 18.4716 d 14 = 1.5000 r 15 = 16.4313 (aspherical) d 15 = 5.0000 n 8 = 1.69680 ν 8 = 55.52 r 16 = 309.6987 d 16 = D 3 r 17 = -70.3155 d 17 = 2.7000 n 9 = 1.77250 ν 9 = 49.66 r 18 = - 27.3036 d 18 = 0.1500 r 19 = 19.6565 d 19 = 7.3000 n 10 = 1.56873 ν 10 = 63.16 r 20 = -14.1118 d 20 = 1.000 n 11 = 1.80518 ν 11 = 25.43 r 21 = −148.9617 d 21 ＝ D 4 r 22 ＝ ∞ d 22 ＝ 5.5500 n 12 ＝ 1.51633 ν 12 ＝ 64.15 r 23 ＝ ∞ Aspherical coefficient of r 15 B = 0, E = −0.25317 × 10 −4 F = 0.14214 × 10 −7 , G = −0.64436 × 10 −9 H = 0.84177 × 10 −12 f T / f AT = 0.2382, ( e 2W −e 2T ) / e 2W = 0.6065 n 4T1 = 1.77250 n 4T2 = 1.56873 , ν 4T1 = 49.66 ν 4T2 = 63.16, y = 9.4520 However, r 1 , r 2 , ... Are the radii of curvature of the lens surfaces, d 1 , d 2 ,.
Is the wall thickness and the lens spacing of each lens, n 1 , n 2 , ... Is the refractive index of each lens, and ν 1 , ν 2 , ... Is the Abbe number of each lens.
上記実施例のうち、実施例１は第１図に示すレンズ構成
で第３群が２枚の正レンズよりなりレンジ系全体で11枚
のレンズよりなつている。尚非球面は第３群の物体側の
正レンズの像側面（r14）に設けてある。又Ｆはフイル
ターである。この実施例のｆ＝9,31.5,54の各収差は第
９図，第10図，第11図に、又望遠端で近距離に合焦した
時の収差は第12図に示す通りである。Of the above-described embodiments, the first embodiment has the lens configuration shown in FIG. 1 in which the third group is composed of two positive lenses and the entire range system is composed of eleven lenses. The aspherical surface is provided on the image side surface (r 14 ) of the positive lens on the object side in the third lens unit. F is a filter. The aberrations of f = 9, 31.5, and 54 in this embodiment are as shown in FIGS. 9, 10, and 11, and the aberrations when focusing on a short distance at the telephoto end are as shown in FIG. .
実施例２は第２図に示すレンズ構成で第３群が１枚の正
レンズよりなり、レンズ系全体は10枚のレンズよりなつ
ている。又非球面は、第３群の物体側の面（r13）に設
けてある。この実施例のｆ＝8.5,29.75,51の収差は、夫
々第13図，第14図，第15図に、望遠端で近距離合焦時の
収差は第16図に示してある。The second embodiment has a lens configuration shown in FIG. 2 in which the third group is composed of one positive lens, and the entire lens system is composed of ten lenses. The aspherical surface is provided on the object-side surface (r 13 ) of the third lens unit. Aberrations of f = 8.5, 29.75 and 51 of this embodiment are shown in FIGS. 13, 14 and 15, respectively, and aberrations at the telephoto end when focused at a short distance are shown in FIG.
実施例３は、第３群が正レンズと負レンズの２枚のレン
ズよりなり全体で11枚のレンズよりなる。非球面は第３
群正レンズの物体側の面（r13）に設けられている。こ
の実施例のｆ＝8.5,29.75,51の収差は第17図，第18図，
第19図に、望遠端で近距離合焦時の収差は第20図に示し
てある。In the third embodiment, the third group includes two lenses, a positive lens and a negative lens, and has a total of 11 lenses. The aspherical surface is the third
It is provided on the object-side surface (r 13 ) of the group positive lens. The aberrations of f = 8.5, 29.75, 51 in this embodiment are shown in FIGS.
FIG. 19 shows aberrations at the telephoto end when focusing on a short distance, and FIG. 20.
実施例４は第４図の通りで第３群が２枚の正レンズと１
枚の負レンズの３枚よりなり全体で12枚よりなつてい
る。又非球面は、第３群の２枚目の正レンズの物体側の
面（r15）に設けられている。この実施例のｆ＝9,31.5,
54の収差は、第21図，第22図，第23図に、望遠端で近距
離合焦時の収差は第24図に示してある。The fourth embodiment is as shown in FIG. 4, and the third lens unit has two positive lenses
It consists of 3 negative lenses and 12 lenses in total. The aspherical surface is provided on the object-side surface (r 15 ) of the second positive lens in the third group. F = 9,31.5 in this example,
The aberration of 54 is shown in FIGS. 21, 22, and 23, and the aberration at the telephoto end at a short distance is shown in FIG.
実施例５は第５図の通りで第３群は正レンズと負レンズ
の２枚からなり全体で11枚からなる。又非球面は正レン
ズの像側面（r14）に設けられている。この実施例のｆ
＝9,31.5,54の収差は第25図、第26図、第27図に、望遠
端で近距離合焦時の収差は第28図に示す通りである。The fifth embodiment is as shown in FIG. 5, and the third lens group is composed of two lenses, a positive lens and a negative lens, and 11 lenses in total. The aspherical surface is provided on the image side surface (r 14 ) of the positive lens. F in this embodiment
The aberrations of = 9,31.5,54 are as shown in FIGS. 25, 26 and 27, and the aberrations at the telephoto end when focusing on a short distance are as shown in FIG.
実施例６は第６図のように第３群が負レンズ，正レン
ズ，負レンズの３枚からなり全体で12枚よりなる。又非
球面は正レンズの像側の面（r16）に設けられている。
この実施例のｆ＝9,31.5,54の収差は第29図，第30図，
第31図に、望遠端で近距離合焦時の収差は第32図に示す
通りである。In the sixth embodiment, as shown in FIG. 6, the third lens group has three lenses, that is, a negative lens, a positive lens, and a negative lens. The aspherical surface is provided on the image side surface (r 16 ) of the positive lens.
The aberrations of f = 9,31.5,54 in this embodiment are shown in FIGS.
FIG. 31 shows aberrations when focusing on a short distance at the telephoto end, as shown in FIG.
実施例７は第７図の通りで第３群が１枚の正レンズより
なり全体で10枚のレンズである。非球面は第３群の正レ
ンズの物体側の面（r13）に設けられている。この実施
例のｆ＝9,31.5,54の収差は第33図，第34図，第35図
に、望遠端で近距離合焦時の収差は第36図に示す通りで
ある。The seventh embodiment is as shown in FIG. 7, and the third lens group is composed of one positive lens, and there are a total of ten lenses. The aspherical surface is provided on the object-side surface (r 13 ) of the positive lens in the third group. The aberrations of f = 9, 31.5, 54 in this embodiment are as shown in FIGS. 33, 34 and 35, and the aberrations at the telephoto end when focusing on a short distance are as shown in FIG.
実施例８は第３群が負レンズと正レンズの２枚のレンズ
よりなり、全体では11枚よりなる。非球面は第３群の正
レンズの物体側の面（r15）に設けてある。この実施例
のｆ＝9,31.5,54の収差は第37図、第38図、第39図に、
望遠端で近距離合焦時の収差は第40図に示してある。In the eighth embodiment, the third lens group is composed of two lenses, a negative lens and a positive lens, and 11 lenses in total. The aspherical surface is provided on the object-side surface (r 15 ) of the positive lens in the third group. The aberrations of f = 9, 31.5, 54 of this embodiment are shown in FIGS. 37, 38 and 39.
Aberrations when focusing at a short distance at the telephoto end are shown in FIG.
本発明のズームレンズは、非球面を用いると共に従来の
ズームレンズのコンペンセーターをなくして第４群（リ
レーレンズ）にコンペンセーターの役割をもたせること
によつて従来は少なくとも13枚のレンズを必要としたも
のを10〜12枚のレンズ構成とし小型で、軽量で、大口径
高変倍比でしかも高性になし得た。また第４群によるリ
アーフオーカスをも可能にしフオーカシングの軽量化、
前玉の偏芯量の軽減や容易にクローズアツプフオーカシ
ングが可能である等の効果をも有している。The zoom lens of the present invention requires at least 13 lenses in the related art by using an aspherical surface and eliminating the compensator of the conventional zoom lens to allow the fourth group (relay lens) to serve as a compensator. The lens has a structure of 10 to 12 lenses, is compact, lightweight, and has a large aperture, high zoom ratio, and high performance. In addition, the rear focusing by the 4th group is also possible and the weight of focusing is reduced,
It also has the effects of reducing the amount of eccentricity of the front lens and enabling easy close-up focusing.
第１図乃至第８図は夫々本発明の実施例１乃至実施例８
の断面図、第９図乃至第12図は実施例１の収差曲線図、
第13図乃至第16図は実施例２の収差曲線図、第17図乃至
第20図は実施例３の収差曲線図、第21図乃至第24図は実
施例４の収差曲線図、第25図乃至第28図は実施例５の収
差曲線図、第29図乃至第32図は実施例６の収差曲線図、
第33図乃至第36図は実施例７の収差曲線図、第37図乃至
第40図は実施例８の収差曲線図である。1 to 8 show Embodiments 1 to 8 of the present invention, respectively.
9 is a sectional view of the aberration curve of Example 1, and FIG.
FIGS. 13 to 16 are aberration curve diagrams of Example 2, FIGS. 17 to 20 are aberration curve diagrams of Example 3, and FIGS. 21 to 24 are aberration curve diagrams of Example 4 and 25, respectively. FIGS. 28 to 28 are aberration curve diagrams of Example 5, FIGS. 29 to 32 are aberration curve diagrams of Example 6,
33 to 36 are aberration curve diagrams of Example 7, and FIGS. 37 to 40 are aberration curve diagrams of Example 8.
Claims (4)
ンズの３枚のレンズにて構成され全体として正の焦点距
離を有する第１群と、負レンズ，負レンズ，正レンズの
３枚のレンズにて構成され全体として負の焦点距離を有
し変倍時に可動であって主として変倍をつかさどる第２
群と、１枚のレンズにて構成され全体として正の焦点距
離を有し常時固定であって射出側でほぼアフォーカルに
する役割をなし、該レンズの物体側の面が非球面である
第３群と、少し大きな空気間隔をあけて負レンズ，正レ
ンズ，正レンズ又は正レンズ，正レンズ，負レンズの３
枚のレンズにて構成され全体として正の焦点距離を有し
変倍時に発生する焦点位置の変動をなくすいわゆるコン
ペンセーターの役割をすると共に合焦のために可動であ
る第４群とより構成され、次の条件（１）を満足するズ
ームレンズ。 （１）｜fT／fAT｜＜0.6 ただしfTは望遠端における全系の合成焦点距離、fATは
望遠端における第１群から第３群までの合成焦点距離で
ある。1. A first group composed of three lenses, a negative lens, a positive lens, and a positive lens in order from the object side and having a positive focal length as a whole, and a negative lens, a negative lens, and a positive lens. Second lens that has a negative focal length as a whole and is movable during zooming and mainly controls zooming.
A lens having a positive focal length as a whole and having a positive focal length as a whole, is fixed at all times, plays a role of being substantially afocal on the exit side, and has an aspherical surface on the object side of the lens; Negative lens, positive lens, positive lens or positive lens, positive lens, negative lens
It is composed of a fourth lens group, which is composed of a single lens, has a positive focal length as a whole, and serves as a so-called compensator for eliminating the fluctuation of the focal position generated at the time of zooming and is movable for focusing. , A zoom lens satisfying the following condition (1). (1) | f T / f AT | <0.6 where f T is the combined focal length of the entire system at the telephoto end, and f AT is the combined focal length of the first to third lens units at the telephoto end.
特許請求の範囲（１）のズームレンズ。 （２）0.53＜（e2W−e2T）／e2W＜0.77 （４）n4T1又はn4T2＞1.55 （５）ν4T1又はν4T2＞45 （６）光軸からの高さｙ＝fIII/4において ただしfWは広角端における全系の焦点距離、fTは望遠端
における全系の焦点距離、fIIIは第３群の焦点距離、f
IVは第４群の合成焦点距離、e2Wは第２群と第３群との
広角端における主点間隔、e2Tは第２群と第３群との望
遠端における主点間隔、n4T1，ν4T1は夫々第４群の物
体側から１番目の正レンズの屈折率とアッベ数、n4T2，
ν4T2は夫々第４群の物体側から２番目の正レンズの屈
折率とアッベ数、ΔＸは非球面が にて表わされる時のEy4＋Fy6＋Gy8＋Hy10の値である。2. A zoom lens according to claim 1, which satisfies the following conditions (2) to (6). (2) 0.53 <(e 2W −e 2T ) / e 2W <0.77 (4) In the n 4T1 or n 4T2> 1.55 (5) ν 4T1 or [nu 4T2> 45 (6) height y = f III / 4 from the optical axis Where f W is the focal length of the entire system at the wide-angle end, f T is the focal length of the entire system at the telephoto end, f III is the focal length of the third lens group, and f
IV is the composite focal length of the fourth lens group, e 2W is the principal point distance between the second lens group and the third lens group at the wide-angle end, e 2T is the principal point distance between the second lens group and the third lens group at the telephoto end, and n 4T1 , [nu 4T1 is the refractive index of the first positive lens from each object side of the fourth group and the Abbe number, n 4T2,
ν 4T2 is the refractive index and Abbe number of the second positive lens from the object side in the fourth group, and Δ X is the aspherical surface. It is the value of Ey 4 + Fy 6 + Gy 8 + Hy 10 when expressed by.
ンズの３枚のレンズにて構成され全体として正の焦点距
離を有する第１群と、負レンズ，負レンズ，正レンズの
３枚のレンズにて構成され全体として負の焦点距離を有
し変倍時に可動であって主として変倍をつかさどる第２
群と、２枚又は３枚のレンズにて構成され全体として正
の焦点距離を有し常時固定であって射出側でほぼアフォ
ーカルにする役割をなし非球面を含んでいる第３群と、
少し大きな空気間隔をあけて負レンズ，正レンズ，正レ
ンズ又は正レンズ，正レンズ，負レンズの３枚のレンズ
にて構成され全体として正の焦点距離を有し変倍時に発
生する焦点位置の変動をなくすいわゆるコンペンセータ
ーの役割をすると共に合焦のために可動である第４群と
より構成され、次の条件（１）を満足するズームレン
ズ。 （１）｜fT／fAT｜＜0.6 ただしfTは望遠端における全系の合成焦点距離、fATは
望遠端における第１群から第３群までの合成焦点距離で
ある。3. A first group consisting of three lenses, a negative lens, a positive lens, and a positive lens, having a positive focal length as a whole from the object side, and a negative lens, a negative lens, and a positive lens. Second lens that has a negative focal length as a whole and is movable during zooming and mainly controls zooming.
And a third group including two or three lenses, which has a positive focal length as a whole, is fixed at all times, has a role of making the lens substantially afocal on the exit side, and includes an aspherical surface,
It consists of three lenses, negative lens, positive lens, positive lens or positive lens, positive lens and negative lens, with a large air gap, and has a positive focal length as a whole, A zoom lens configured to include a fourth group that functions as a so-called compensator for eliminating fluctuations and that is movable for focusing, and satisfies the following condition (1). (1) | f T / f AT | <0.6 where f T is the combined focal length of the entire system at the telephoto end, and f AT is the combined focal length of the first to third lens units at the telephoto end.
特許請求の範囲（３）のズームレンズ。 （２）0.53＜（e2W−e2T）／e2W＜0.77 （４）n4T1又はn4T2＞1.55 （５）ν4T1又はν4T2＞45 （６）光軸からの高さｙ＝fIII/4において ただしfWは広角端における全系の焦点距離、fTは望遠端
における全系の焦点距離、fIIIは第３群の焦点距離、f
IVは第４群の合成焦点距離、e2Wは第２群と第３群との
広角端における主点間隔、e2Tは第２群と第３群との望
遠端における主点間隔、n4T1，ν4T1は夫々第４群の物
体側から１番目の正レンズの屈折率とアッベ数、n4T2，
ν4T2は夫々第４群の物体側から２番目の正レンズの屈
折率とアッベ数、ΔＸは非球面が にて表わされる時のEy4＋Fy6＋Gy8＋Hy10の値である。4. A zoom lens according to claim 3, which satisfies the following conditions (2) to (6). (2) 0.53 <(e 2W −e 2T ) / e 2W <0.77 (4) In the n 4T1 or n 4T2> 1.55 (5) ν 4T1 or [nu 4T2> 45 (6) height y = f III / 4 from the optical axis Where f W is the focal length of the entire system at the wide-angle end, f T is the focal length of the entire system at the telephoto end, f III is the focal length of the third lens group, and f
IV is the composite focal length of the fourth lens group, e 2W is the principal point distance between the second lens group and the third lens group at the wide-angle end, e 2T is the principal point distance between the second lens group and the third lens group at the telephoto end, and n 4T1 , [nu 4T1 is the refractive index of the first positive lens from each object side of the fourth group and the Abbe number, n 4T2,
ν 4T2 is the refractive index and Abbe number of the second positive lens from the object side in the fourth group, and Δ X is the aspherical surface. It is the value of Ey 4 + Fy 6 + Gy 8 + Hy 10 when expressed by.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17272286A JPH07107577B2 (en) | 1986-07-24 | 1986-07-24 | Zoom lenses |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17272286A JPH07107577B2 (en) | 1986-07-24 | 1986-07-24 | Zoom lenses |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6329718A JPS6329718A (en) | 1988-02-08 |
| JPH07107577B2 true JPH07107577B2 (en) | 1995-11-15 |
Family
ID=15947116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17272286A Expired - Fee Related JPH07107577B2 (en) | 1986-07-24 | 1986-07-24 | Zoom lenses |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07107577B2 (en) |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2502754B2 (en) * | 1989-06-29 | 1996-05-29 | 松下電器産業株式会社 | Aspherical zoom lens |
| JP3123747B2 (en) * | 1990-06-08 | 2001-01-15 | オリンパス光学工業株式会社 | Zoom lens |
| US5189558A (en) * | 1990-06-11 | 1993-02-23 | Olympus Optical Co., Ltd. | Vari-focal system having short total length |
| JP2744336B2 (en) * | 1990-07-20 | 1998-04-28 | キヤノン株式会社 | Rear focus zoom lens |
| JP2832075B2 (en) * | 1990-07-20 | 1998-12-02 | キヤノン株式会社 | Rear focus zoom lens |
| JP2876823B2 (en) * | 1991-06-07 | 1999-03-31 | キヤノン株式会社 | Rear focus zoom lens |
| US5359457A (en) * | 1991-10-03 | 1994-10-25 | Minolta Camera Co., Ltd. | Wide-angle zoom lens system |
| US5963378A (en) * | 1994-03-30 | 1999-10-05 | Canon Kabushiki Kaisha | Zoom lens |
| JP3686178B2 (en) * | 1996-08-23 | 2005-08-24 | オリンパス株式会社 | Zoom lens |
| US6751028B1 (en) | 1998-03-10 | 2004-06-15 | Canon Kabushiki Kaisha | Zoom lens and optical apparatus using the same |
| US6344932B1 (en) | 1999-01-19 | 2002-02-05 | Canon Kabushiki Kaisha | Zoom lens and optical apparatus having the same |
| JP4153640B2 (en) | 1999-03-09 | 2008-09-24 | オリンパス株式会社 | Zoom lens and imaging device |
| JP4379957B2 (en) | 1999-07-26 | 2009-12-09 | キヤノン株式会社 | Rear focus zoom lens and optical apparatus using the same |
| JP4447703B2 (en) | 1999-10-20 | 2010-04-07 | キヤノン株式会社 | Zoom lens and optical apparatus using the same |
| JP5129520B2 (en) | 2007-06-29 | 2013-01-30 | 株式会社エルモ社 | Zoom lens |
| JP5305177B2 (en) * | 2010-12-07 | 2013-10-02 | 株式会社ニコン | Zoom lens, imaging apparatus, and zoom lens manufacturing method |
| US8730587B2 (en) | 2011-06-08 | 2014-05-20 | Olympus Corporation | Zoom lens and image pickup apparatus using the same |
| JP5932541B2 (en) | 2011-09-30 | 2016-06-08 | オリンパス株式会社 | Zoom lens, imaging device using the same, video transmission device, and video transmission system |
| JP6720231B2 (en) | 2018-02-06 | 2020-07-08 | キヤノン株式会社 | Zoom lens and imaging device having the same |
-
1986
- 1986-07-24 JP JP17272286A patent/JPH07107577B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6329718A (en) | 1988-02-08 |
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