JP2603280B2 - High zoom lens - Google Patents
High zoom lensInfo
- Publication number
- JP2603280B2 JP2603280B2 JP63017564A JP1756488A JP2603280B2 JP 2603280 B2 JP2603280 B2 JP 2603280B2 JP 63017564 A JP63017564 A JP 63017564A JP 1756488 A JP1756488 A JP 1756488A JP 2603280 B2 JP2603280 B2 JP 2603280B2
- Authority
- JP
- Japan
- Prior art keywords
- lens
- lens group
- refractive power
- zoom
- lens unit
- 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.)
- Expired - Fee Related
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/145—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only
- G02B15/1451—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive
- G02B15/145121—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive arranged +-+-+
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Description
【発明の詳細な説明】 ＜産業上の利用分野＞ 本発明は、５群構成でコンパクトでありながら、高変
倍比が得られるズームレンズに関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a zoom lens which has a five-unit configuration and is compact, and which can obtain a high zoom ratio.
＜従来の技術＞ 従来より、ステイルカメラ、ビデオカメラ等のズーム
レンズとして、広角域を含み高変倍が得ることができる
レンズが要求されている。そして広角を含み、高変倍可
能であり、しかも比較的コンパクト化が可能なズームレ
ンズとして順に正，負，正，負，正の屈折力から成る５
群構成のズームレンズがある。例えば、特開昭57−1647
10号公報、特開昭60−39613号公報そして特開昭59−934
11号公報のものが知られている。特開昭57−164710号や
特開昭60−39613号公報では、ズーム比がおよそ３〜５
倍程度のズームレンズを開示している。特開昭59−9341
1号公報に変倍比10倍程度のズームレンズを開示してい
るが、広角端でのテレ比が1.35程度であり、レンズ系が
大型化する傾向にあった。<Conventional Technology> Conventionally, as a zoom lens for a stale camera, a video camera, or the like, a lens that includes a wide angle range and can obtain high zoom ratio has been demanded. As a zoom lens that includes a wide angle, is capable of high zooming, and is relatively compact, the zoom lens has positive, negative, positive, negative, and positive refractive power in order.
There is a zoom lens with a group configuration. For example, JP-A-57-1647
No. 10, JP-A-60-39613 and JP-A-59-934
No. 11 is known. In JP-A-57-164710 and JP-A-60-39613, the zoom ratio is about 3-5.
A zoom lens of about double magnification is disclosed. JP-A-59-9341
No. 1 discloses a zoom lens with a zoom ratio of about 10 times, but the telephoto ratio at the wide-angle end is about 1.35, and the lens system tends to be large.
＜発明が解決しようとする問題点＞ 本発明の目的は、変倍比の増大を図りつつ、コンパク
トなズームレンズを提供することにある。また、移動レ
ンズ群を極力少なくして、レンズ鏡筒の簡素化を図るこ
とにある。<Problems to be Solved by the Invention> An object of the present invention is to provide a compact zoom lens while increasing the zoom ratio. Another object is to simplify the lens barrel by minimizing the number of moving lens groups.
そして本発明の構成は、物体側より順に、正の屈折力
の第１レンズ群、負の屈折力の第２レンズ群、正の屈折
力の第３レンズ群、負の屈折力の第４レンズ群、正の屈
折力の第５レンズ群の５つのレンズ群を有し、広角端か
ら望遠端への変倍に際し前記第２レンズ群，前記第５レ
ンズ群を固定で、前記第１レンズ群及び前記第３レンズ
群を物体側へ移動させ、前記第４レンズ群を像面側へ移
動させて行い、第１レンズ群，第２レンズ群，第３レン
ズ群の焦点距離を各々f1,f2,f3、望遠端における全系の
焦点距離をFTとしたとき、 0.22＜f1/FT＜0.6 0.046＜|f2/FT|＜0.093 1.8＜|f3/f2|＜3.0 なる条件式を満足している。The configuration of the present invention includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group having a negative refractive power. A fifth lens group having a positive refractive power, the second lens group and the fifth lens group being fixed during zooming from the wide-angle end to the telephoto end; And moving the third lens group toward the object side, and moving the fourth lens group toward the image plane, so that the focal lengths of the first lens group, the second lens group, and the third lens group are respectively f 1 , f 2, f 3, when the focal length of the entire system at the telephoto end was F T, 0.22 <f 1 / F T <0.6 0.046 <| f 2 / F T | <0.093 1.8 <| f 3 / f 2 | <3.0 is satisfied.
＜実施例＞ 以下図面に基づいて実施例を説明する。An embodiment will be described below with reference to the drawings.
第１図は、本発明に関するズームレンズの断面を示
す。同図に於いて、１乃至５は物体側より順に、正，
負，正，負，正の屈折力を有する第１レンズ群，第２レ
ンズ群，第３レンズ群，第４レンズ群，第５レンズ群で
ある。FIG. 1 shows a cross section of a zoom lens according to the present invention. In the figure, 1 to 5 are positive, positive in order from the object side.
These are a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group having negative, positive, negative, and positive refractive power.
本実施例では、広角端から望遠端への変倍に際してレ
ンズの鏡筒構造の簡素化を図るために、第２レンズ群２
と第５レンズ群５とを固定し、第１レンズ群１と第３レ
ンズ群３を共に物体側へ、第４レンズ群４を像面側へ移
動させている。つまり、望遠側になるに従い第１レンズ
群１を物体側に移動させ、第２レンズ群２に大きな変倍
作用をもたせることで、広角側に於けるレンズ全長を短
くすると共に、広角端での軸外光線確保のために前五レ
ンズ径が増大することを防止している。In the present embodiment, in order to simplify the lens barrel structure during zooming from the wide-angle end to the telephoto end, the second lens unit 2
And the fifth lens group 5 are fixed, the first lens group 1 and the third lens group 3 are both moved to the object side, and the fourth lens group 4 is moved to the image plane side. In other words, the first lens unit 1 is moved toward the object side as the distance from the telephoto side increases, and the second lens unit 2 has a large zooming effect, thereby shortening the overall length of the lens on the wide-angle side and at the wide-angle end. To prevent off-axis rays, the diameter of the first five lenses is prevented from increasing.
そして、第３レンズ群３を物体側に移動させて、第３
レンズ群３にも変倍作用を分担させて、ズーム比が８〜
10倍程度の高変倍比ズームレンズを達成している。Then, the third lens group 3 is moved to the object side,
The lens unit 3 is also assigned a variable power function so that a zoom ratio of 8 to
A zoom lens with a high zoom ratio of about 10x has been achieved.
尚、本実施例に於いては前述のレンズ構成において、
第３群及び第４群との２群を移動させてフオーカシング
を行うことにより、収差変動を少なくしつつレンズ全長
の短縮化を図っている。In this embodiment, in the above-described lens configuration,
Focusing is performed by moving the second lens unit including the third lens unit and the fourth lens unit, thereby reducing the aberration variation and shortening the overall lens length.
そして、フオーカシングレンズの結像倍率βを１以上
に設定することで、無限遠物体から至近物体へのフオー
カシングに際して、フオーカシングレンズ群の像面側へ
移動させると共に、フオーカシングレンズにも増倍させ
る作用を持たせている。又、フオーカシングレンズの像
面側に正の屈折力を有し、固定の第５レンズ群を配置す
ることにより、フオーカシングの際の敏感度を適切な大
きさに設定することができる。尚、フオーカシングは第
３図の図面の波線に示す通り第３レンズ群及び第４レン
ズ群を一体的に移動させて行っている。By setting the imaging magnification β of the focusing lens to be 1 or more, the focusing lens is moved to the image plane side of the focusing lens group when focusing from an object at infinity to a close object, and the focusing lens is moved to the focusing lens. Also has the effect of multiplying. In addition, by disposing a fixed fifth lens group having a positive refractive power on the image plane side of the focusing lens, the sensitivity at the time of focusing can be set to an appropriate size. Focusing is performed by integrally moving the third lens unit and the fourth lens unit as shown by a broken line in the drawing of FIG.
本実施例に於いて高変倍比を有しつつ高い光学性能の
ズームレンズを達成するには次の諸条件を満足させるこ
とが好ましい。In order to achieve a zoom lens having a high zoom ratio and a high optical performance in this embodiment, it is preferable to satisfy the following conditions.
第１レンズ群，第２レンズ群，第３レンズ群の焦点距
離を各々f1,f2,f3、望遠端における全系の焦点距離をFT
としたとき、 0.22＜f1/FT＜0.6 （１） 0.046＜|f2/FT|＜0.093 （２） 1.8＜|f3/f2|＜3.0 （３） 以下各条件式の上限値および下限値の意味について説
明する。The focal lengths of the first lens unit, the second lens unit, and the third lens unit are respectively f 1 , f 2 , and f 3 , and the focal length of the entire system at the telephoto end is F T
0.22 <f 1 / F T <0.6 (1) 0.046 <| f 2 / F T | <0.093 (2) 1.8 <| f 3 / f 2 | <3.0 (3) The meaning of the value and the lower limit will be described.
条件式（１）は望遠端における全系の焦点距離に対す
る第１レンズ群の屈折力の比に関するものである。条件
式（１）の上限値を越えて第１レンズ群の屈折力が弱く
なりすぎると所定の変倍比を得る為の第１レンズ群の移
動量が増加し望遠端でのレンズ全長が長くなってくる。
又フオーカスの際の第３レンズ群及び第４レンズ群の移
動量が小さくなりすぎて機械的な制御がむずかしくなっ
てくる。一方、条件式（１）の下限値を越えて第１レン
ズ群の屈折力が強くなりすぎるとフオーカスの際の第３
レンズ群及び第４レンズ群の移動量が大きくなり、その
為、予めレンズ系中に余分な空気間隔をあけておかねば
ならなくなり、この結果広角端及び望遠端でレンズ全長
が長くなるので好ましくない。Conditional expression (1) relates to the ratio of the refractive power of the first lens unit to the focal length of the entire system at the telephoto end. If the refractive power of the first lens unit becomes too weak beyond the upper limit of conditional expression (1), the amount of movement of the first lens unit for obtaining a predetermined zoom ratio increases, and the overall length of the lens at the telephoto end increases. It is becoming.
In addition, the amount of movement of the third lens unit and the fourth lens unit during focusing becomes too small, so that mechanical control becomes difficult. On the other hand, if the refractive power of the first lens unit becomes too strong beyond the lower limit value of the conditional expression (1), the third lens at the time of focusing will fail.
The amount of movement of the lens group and the fourth lens group becomes large, so that an extra air space must be provided in the lens system in advance, and as a result, the overall length of the lens becomes long at the wide-angle end and the telephoto end, which is not preferable. .
条件式（２）は第２レンズ群の屈折力に関し、主に第
２レンズ群の変倍効果を充分に発揮させ所定の変倍比を
得つつレンズ全系の小型化を図るためのものである。条
件式（２）の上限値を越えて第２レンズ群の屈折力が弱
くなってくると所定の変倍比を得るために第１レンズ群
の移動量を増加させねばならずレンズ全長が増大すると
共に、第１レンズ群の有効径が大きくなってくるので好
ましくない。更に所定の変倍比を得る為に第３レンズ群
の移動量を増加させる必要があり、その為広角端におい
て予め第２レンズ群と第３レンズ群との空気間隔を広く
とっておかねばならず、この結果軸外光束を所定量確保
する為の第１レンズ群の有効径が増大してくるので良く
ない。一方、条件式（２）の下限値を越えて第２レンズ
群の屈折力が強くなりすぎると、レンズ全長は短くなる
がパツツバール和の負の方向に増大し、像面特性を良好
に維持するのが難しくなるとともに変倍に際して第２レ
ンズ群より球面収差が多く発生し、この球面収差の変動
を良好に補正するのが難しくなってくる。Conditional expression (2) relates to the refracting power of the second lens unit, and is mainly used to sufficiently exhibit the zooming effect of the second lens unit and obtain a predetermined zooming ratio while miniaturizing the entire lens system. is there. If the refractive power of the second lens unit becomes weaker than the upper limit of conditional expression (2), the amount of movement of the first lens unit must be increased in order to obtain a predetermined zoom ratio, and the overall length of the lens increases. At the same time, the effective diameter of the first lens group increases, which is not preferable. Further, in order to obtain a predetermined zoom ratio, it is necessary to increase the amount of movement of the third lens unit. Therefore, it is necessary to widen the air gap between the second lens unit and the third lens unit in advance at the wide angle end. However, as a result, the effective diameter of the first lens group for securing a predetermined amount of off-axis light flux increases, which is not good. On the other hand, if the refractive power of the second lens group becomes too strong beyond the lower limit value of the conditional expression (2), the overall length of the lens is shortened, but increases in the negative direction of the Patzval sum, and the image surface characteristic is maintained well. Becomes more difficult, and more spherical aberration occurs in the second lens group during zooming, and it becomes difficult to satisfactorily correct the fluctuation of the spherical aberration.
条件式（３）は、第２レンズ群の屈折力と第３レンズ
群の屈折力との比に関するものである。条件式（３）の
上限値を越えて第３レンズ群の屈折力が弱くなってくる
と所定の変倍比を得る為に第３レンズ群の移動量を増大
させねばならず、この結果、広角端で第２レンズ群と第
３レンズ群との間隔を予めとっておく必要があり、その
分レンズ全長が長くなる。又、軸外光束を確保する為の
第１レンズ群の有効径が増大し、更に第３レンズ群と第
４レンズ群の望遠端における間隔も増大し遠望端におけ
るレンズ全長が増大してくるので好ましくない。条件式
（３）の下限式を越えて第３レンズ群の屈折力が強くな
りすぎると収差補正の為に各レンズ群の屈折力を強めな
ければならず、この結果ペツツバール和を良好に維持す
るのが難しくなる。又変倍における球面収差の変動を良
好に補正するのが難しくなってくる。Conditional expression (3) relates to the ratio between the refractive power of the second lens group and the refractive power of the third lens group. If the refractive power of the third lens unit becomes weaker than the upper limit of conditional expression (3), the amount of movement of the third lens unit must be increased in order to obtain a predetermined zoom ratio. At the wide-angle end, the distance between the second lens group and the third lens group needs to be set in advance, and the overall length of the lens becomes longer. Further, the effective diameter of the first lens unit for securing the off-axis light flux increases, and the distance between the third lens unit and the fourth lens unit at the telephoto end also increases, so that the total length of the lens at the telephoto end increases. Not preferred. If the refractive power of the third lens group becomes too strong beyond the lower limit of conditional expression (3), the refractive power of each lens group must be increased for aberration correction. As a result, the Petzval sum is favorably maintained. It becomes difficult. Also, it becomes difficult to satisfactorily correct the fluctuation of the spherical aberration during zooming.
さらに、高速倍比を保ちつつコンパクトなズームレン
ズを達成するには、次の条件を満足させるのが好まし
い。Further, in order to achieve a compact zoom lens while maintaining a high speed ratio, it is preferable to satisfy the following conditions.
第１レンズ群，第３レンズ群の広角端から望遠端への
移動量を各々M1,M3としたとき、 １M1/M3＜1.8 （４） なる条件を満足させることである。When the amounts of movement of the first lens unit and the third lens unit from the wide-angle end to the telephoto end are respectively M 1 and M 3 , the following condition is satisfied: 1M 1 / M 3 <1.8 (4)
本実施例においては、主に第２レンズ群及び第３レン
ズ群で変倍を行っているが、条件式（４）はこの時の変
倍比の分担に関するものである。条件式（４）の上限値
を越えて第１レンズ群の移動量が第３レンズ群の移動量
に対して大きくなると、第１レンズ群及び第２レンズ群
で発生する収差の変動が大きくなり、その補正が困難と
なる。また比較的重量の大きな第１レンズ群が大きく移
動することはズーミングのトルクの増大につながり好ま
しくない。条件式（４）の下限値を越えて第３レンズ群
の移動量が第１レンズ群の移動量に対して大きくなる
と、第３レンズ群の移動のための間隔を確保するため
に、広角端におけるレンズ全長が増大し好ましくない。In the present embodiment, the zooming is mainly performed by the second lens unit and the third lens unit, but the conditional expression (4) relates to the sharing of the zooming ratio at this time. If the amount of movement of the first lens group exceeds the upper limit of conditional expression (4) with respect to the amount of movement of the third lens group, the fluctuation of aberration occurring in the first lens group and the second lens group increases. , It becomes difficult to correct it. Also, a large movement of the first lens group having a relatively large weight is undesirable because it leads to an increase in zooming torque. When the movement amount of the third lens group becomes larger than the movement amount of the first lens group beyond the lower limit value of conditional expression (4), the wide-angle end is set in order to secure an interval for the movement of the third lens group. Is unfavorable because the total lens length increases.
次に本発明の数値実施例を示す。数値実施例1,2に於
いてRiは物体側より第ｉ番目のレンズ面の曲率半径、Di
は物体側より第ｉ番目のレンズ厚又は空気間隔、Niとν
ｉは各々物体側より第ｉ番目のガラス屈折率とアツベ数
である。Next, numerical examples of the present invention will be described. In Numerical Examples 1 and 2, Ri is the radius of curvature of the i-th lens surface from the object side, Di
Is the i-th lens thickness or air gap from the object side, Ni and ν
i is the i-th glass refractive index and the Abbe number, respectively, from the object side.
以上、説明した通り本発明によれば、コンパクトであ
りながら変倍比がおよそ８〜10倍程度のズームレンズを
提供することができた。 As described above, according to the present invention, a compact zoom lens having a zoom ratio of about 8 to 10 times can be provided.
第１図、第２図は、夫々数値実施例1,2に示すレンズ断
面図である。 第３図は、本発明のズームレンズの移動軌跡を示す図で
ある。 第４図（ａ），（ｂ），（ｃ）は順に数値実施例１に示
すズームレンズであって物体距離無限遠の時の広角端、
中望遠、望遠端の収差図、 第５図（ａ），（ｂ），（ｃ）は順に数値実施例１に示
すズームレンズであって物体距離1.5mの時の広角端、中
望遠の収差図、物体距離3mの時の望遠端の収差図であ
る。 第６図（ａ），（ｂ），（ｃ）は順に数値実施例２に示
すズームレンズであって物体距離無限遠の時の広角端、
中望遠、望遠端の収差図、 第７図（ａ），（ｂ），（ｃ）は、順に数値実施例２に
示すズームレンズであって物体距離1.5mの時の広角端、
中望遠の収差図、物体距離3mの時の望遠端の収差図であ
る。 図中Ｍはメリデイオナル焦線、Ｓはサジタル焦線、ｄは
ｄ線、ｇはｇ線である。FIG. 1 and FIG. 2 are lens cross-sectional views shown in Numerical Examples 1 and 2, respectively. FIG. 3 is a diagram showing a movement locus of the zoom lens of the present invention. FIGS. 4 (a), (b), and (c) show the zoom lens shown in numerical example 1 in order at the wide-angle end when the object distance is infinite.
5A, 5B, and 5C are aberration diagrams of the zoom lens shown in Numerical Example 1 at the wide-angle end and the medium telephoto end when the object distance is 1.5 m, respectively. FIG. 3 is an aberration diagram at a telephoto end when the object distance is 3 m. FIGS. 6 (a), (b) and (c) show the zoom lens shown in numerical example 2 in order at the wide-angle end when the object distance is infinity.
7A, 7B, and 7C show the zoom lens shown in Numerical Example 2 in order at the wide-angle end when the object distance is 1.5 m,
FIG. 7 is an aberration diagram at a medium telephoto end, and an aberration diagram at a telephoto end at an object distance of 3 m. In the figure, M is a meridional focal line, S is a sagittal focal line, d is a d line, and g is a g line.
Claims (2)
群、負の屈折力の第２レンズ群、正の屈折力の第３レン
ズ群、負の屈折力の第４レンズ群、正の屈折力の第５レ
ンズ群の５つのレンズ群を有し、広角端から望遠端への
変倍に際し前記第２レンズ群，前記第５レンズ群を固定
で前記第１レンズ群及び前記第３レンズ群を物体側へ移
動させ、前記第４レンズ群を像面側へ移動させて、第１
レンズ群，第２レンズ群，第３レンズ群の焦点距離を各
々f1,f2,f3、望遠端における全系の焦点距離をFTとした
とき、 0.22＜f1/FT＜0.6 0.046＜|f2/FT|＜0.093 1.8＜|f3/f2|＜3.0 なる条件式を満足することを特徴とする高変倍ズームレ
ンズ。A first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a negative refractive power, and It has five lens groups, a fifth lens group having a positive refractive power, and the first lens group and the fifth lens group are fixed with the second lens group and the fifth lens group fixed during zooming from the wide-angle end to the telephoto end. The third lens group is moved to the object side, and the fourth lens group is moved to the image plane side.
When the focal lengths of the lens group, the second lens group, and the third lens group are respectively f 1 , f 2 , and f 3 , and the focal length of the entire system at the telephoto end is F T , 0.22 <f 1 / F T <0.6 A high-magnification zoom lens characterized by satisfying the following conditional expression: 0.046 <| f 2 / F T | <0.093 1.8 <| f 3 / f 2 | <3.0
角端から遠望端へのズーミングのための移動量を各々
M1,M3とした時、 １≦M1/M3＜1.8 なる条件式を満足することを特徴とする特許請求の範囲
第１項記載の高変倍ズームレンズ。2. The moving amounts of the first lens unit and the third lens unit for zooming from a wide-angle end to a telephoto end are respectively set.
2. The zoom lens according to claim 1 , wherein, when M 1 and M 3 , the following conditional expression is satisfied: 1 ≦ M 1 / M 3 <1.8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63017564A JP2603280B2 (en) | 1988-01-28 | 1988-01-28 | High zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63017564A JP2603280B2 (en) | 1988-01-28 | 1988-01-28 | High zoom lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01191819A JPH01191819A (en) | 1989-08-01 |
| JP2603280B2 true JP2603280B2 (en) | 1997-04-23 |
Family
ID=11947408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63017564A Expired - Fee Related JP2603280B2 (en) | 1988-01-28 | 1988-01-28 | High zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2603280B2 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2791162B2 (en) * | 1990-01-31 | 1998-08-27 | キヤノン株式会社 | Rear focus zoom lens |
| US5189557A (en) * | 1990-11-20 | 1993-02-23 | Canon Kabushiki Kaisha | High variable magnification range zoom lens |
| US5978150A (en) * | 1995-06-01 | 1999-11-02 | Nikon Corporation | Zoom lens |
| JP4051731B2 (en) * | 1996-09-04 | 2008-02-27 | 株式会社ニコン | High magnification zoom lens |
| JP2003066334A (en) | 2001-08-29 | 2003-03-05 | Pentax Corp | High variable power zoom lens system |
| JP4731834B2 (en) * | 2004-06-04 | 2011-07-27 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
| JP2009098449A (en) * | 2007-10-17 | 2009-05-07 | Olympus Imaging Corp | Zoom lens and imaging apparatus having the same |
| US8339713B2 (en) * | 2009-11-04 | 2012-12-25 | Nikon Corporation | Zoom optical system, optical apparatus and method for manufacturing zoom optical system |
| JP5521496B2 (en) * | 2009-11-04 | 2014-06-11 | 株式会社ニコン | Variable magnification optical system, optical device |
| JP5159843B2 (en) * | 2010-08-27 | 2013-03-13 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
| JP5465289B2 (en) * | 2012-08-23 | 2014-04-09 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
| JP5592925B2 (en) * | 2012-11-28 | 2014-09-17 | オリンパスイメージング株式会社 | Zoom lens and image pickup apparatus including the same |
-
1988
- 1988-01-28 JP JP63017564A patent/JP2603280B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01191819A (en) | 1989-08-01 |
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