JP2899019B2 - Zoom lens - Google Patents
Zoom lensInfo
- Publication number
- JP2899019B2 JP2899019B2 JP22663489A JP22663489A JP2899019B2 JP 2899019 B2 JP2899019 B2 JP 2899019B2 JP 22663489 A JP22663489 A JP 22663489A JP 22663489 A JP22663489 A JP 22663489A JP 2899019 B2 JP2899019 B2 JP 2899019B2
- Authority
- JP
- Japan
- Prior art keywords
- lens group
- lens
- object side
- refractive power
- telephoto end
- 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 - Lifetime
Links
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、ズームレンズに関し特に写真用カメラ、ビ
デオカメラ等に好適であって、高変倍比及び光学性能を
良好に保ちつつ小型化を図ったズームレンズに関する。Description: BACKGROUND OF THE INVENTION The present invention relates to a zoom lens, and is particularly suitable for a photographic camera, a video camera, and the like, and reduces the size while maintaining a high zoom ratio and good optical performance. It relates to the intended zoom lens.
従来より比較的高変倍比が得られるズームレンズとし
ては、ズームレンズ系を４つのレンズ群で構成し、ズー
ミングに際しては、第２レンズ群が光軸上を移動して変
倍を行い、第３レンズ群が光軸上を移動して像面補正を
行うズームレンズが知られている。一例として特公昭39
-6128号公報、特公昭39-13841号公報、USP2,847,907等
がある。これらは第1,2,3レンズ群で変倍により生じる
収差変動を除去しているが、変倍に依存しない収差、所
謂バイアス成分の収差は変倍に際して固定であって、主
に結像作用を果たす第４レンズ群により補正を行ってい
る。この様に４レンズ群構成のズームレンズは収差補正
を比較的容易に行うことができる反面、第４レンズ群で
像面を後方にリレーする為、全長が長くなると言う欠点
を有していた。また一般に第４レンズ群の前に絞りを配
置する為、前玉径も大型化する欠点を有していた。As a zoom lens capable of obtaining a relatively high zoom ratio compared to the conventional zoom lens system, the zoom lens system includes four lens groups. During zooming, the second lens group moves on the optical axis to perform zooming. There is known a zoom lens in which three lens groups move on the optical axis to perform image plane correction. As an example, Tokiko Sho 39
-6128, JP-B-39-13841, USP 2,847,907 and the like. These remove aberration fluctuations caused by zooming in the first, second, and third lens groups, but aberrations that do not depend on zooming, so-called bias component aberrations, are fixed at the time of zooming. The correction is performed by the fourth lens group which fulfills the above. As described above, the zoom lens having a four-lens group configuration can relatively easily perform aberration correction, but has a disadvantage that the total length is long because the fourth lens group relays the image plane backward. Further, in general, since the stop is arranged in front of the fourth lens group, the diameter of the front lens is disadvantageously increased.
一方、例えば特公昭58-32684号公報では、物体側より
順に正の屈折力を有する第１レンズ群、負の屈折力を有
する第２レンズ群、正の屈折力を有する第３レンズ群で
構成され、比較的に小型なズームレンズを開示してい
る。そして同公報で提案されているズームレンズは、変
倍比が2.5倍程度にとどまっている。On the other hand, for example, in Japanese Patent Publication No. 58-32684, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a positive refractive power are arranged in order from the object side. Discloses a relatively small zoom lens. The zoom lens proposed in the publication has a zoom ratio of only about 2.5.
本発明は、全体として３つのレンズ群より構成し、変
倍比３程度と高変倍化を図る際に、収差の変動が大きく
なるという問題点を解決し、レンズ系全体の小型化を図
りつつかつ変倍の際の収差変動を良好に補正して全変倍
範囲にわたり高い光学性能を維持したズームレンズの提
供を目的とする。The present invention is composed of three lens groups as a whole, and solves the problem that fluctuation of aberration becomes large when a high zoom ratio of about 3 is achieved, thereby reducing the size of the entire lens system. It is another object of the present invention to provide a zoom lens that maintains a high optical performance over the entire zooming range while favorably correcting aberration fluctuations during zooming.
本発明のズームレンズは、物体側より順に、正の屈折
力を有する第１レンズ群、負の屈折力を有する第２レン
ズ群、正の屈折力を有する第３レンズ群から成り、広角
側から望遠側への変倍に際し、第１レンズ群は固定であ
って、第２レンズ群を像面側へ、第３レンズ群を物体側
へ移動させ、第２レンズ群と第３レンズ群の望遠端に於
ける結像倍率をβ2T，β3Tしたとき、 0.7＜β2T／β3T＜1.25 …（１） −1.4＜β2T＜−0.7 …（２） なる条件式を満足したことを特徴としている。The zoom lens 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, and a third lens group having a positive refractive power. During zooming to the telephoto side, the first lens group is fixed, the second lens group is moved to the image plane side, and the third lens group is moved to the object side, so that the telephoto between the second lens group and the third lens group is performed. When the imaging magnification at the end is β 2T and β 3T , the following conditional expression is satisfied: 0.7 <β 2T / β 3T <1.25 (1) −1.4 <β 2T <−0.7 (2) And
以下図面に基づいて本発明の説明をする。 Hereinafter, the present invention will be described with reference to the drawings.
第１図は本発明に関するズームレンズの概略図を示
す。第１図において１は正の屈折力を有する第１レンズ
群、２は負の屈折力を有する第２レンズ群、Ｓは絞り、
３は正の屈折力を有する第３レンズ群、４はローパス効
果を果たす水晶フイルターや赤外カツトフイルターを含
む補正板、Ｆは像面を示す。FIG. 1 is a schematic view of a zoom lens according to the present invention. In FIG. 1, 1 is a first lens group having a positive refractive power, 2 is a second lens group having a negative refractive power, S is an aperture,
Reference numeral 3 denotes a third lens group having a positive refractive power, 4 denotes a correction plate including a quartz filter or an infrared cut filter that performs a low-pass effect, and F denotes an image plane.
そして本実施例に於いては、広角側から望遠側へのズ
ーミングに際して、負の屈折力を有する第２レンズ群と
正の屈折力を有する第３レンズ群３の移動軌跡が逆方向
に光軸上を描くように各レンズ群を移動させて各移動レ
ンズ群に変倍作用を分担させながら高変倍比を得てい
る。In the present embodiment, during zooming from the wide-angle side to the telephoto side, the moving trajectories of the second lens group having a negative refractive power and the third lens group 3 having a positive refractive power move in opposite directions along the optical axis. A high zoom ratio is obtained while each lens group is moved as described above to share the zooming action with each moving lens group.
そして本発明に於いては上述した条件式（１），
（２）を同時に満足させてズームレンズの小型化を図り
ながら第２レンズ群と第３レンズ群でズーミング時の収
差変動をバランスよく補正している。In the present invention, the above-mentioned conditional expression (1),
The second lens group and the third lens group correct aberration fluctuations during zooming in a well-balanced manner while simultaneously satisfying (2) and reducing the size of the zoom lens.
次に前述の条件式の技術的意味について説明する。 Next, the technical meaning of the above conditional expression will be described.
条件式（１），（２）は各々第2,第３レンズ群の望遠
端における結像倍率を適切に設定するものである。Conditional expressions (1) and (2) are for appropriately setting the imaging magnification at the telephoto end of the second and third lens units, respectively.
条件式（１）に示す通り望遠端における第２レンズ群
及び第３レンズ群の結像倍率β2T及び，β3Tをほぼ同等
とすることによって各々の群での収差発生量を分担さ
せ、これによりズーミングによる収差変動量を少なくし
ている。ここで条件式（１）の下限値を越えると、球面
収差が補正過剰傾向となり、さらに望遠端において、像
面湾曲が補正過剰傾向となり好ましくない。また条件式
（１）の上限値を越えると、ズーミングにおける歪曲収
差の変動が大きくなると共に、非点隔差の変動も大きく
なり好ましくない。As shown in conditional expression (1), the imaging magnifications β 2T and β 3T of the second lens unit and the third lens unit at the telephoto end are made substantially equal to share the amount of aberration generation in each unit. Thus, the amount of aberration variation due to zooming is reduced. If the lower limit of conditional expression (1) is exceeded, spherical aberration tends to be overcorrected, and at the telephoto end, field curvature tends to be overcorrected. When the value exceeds the upper limit of conditional expression (1), the fluctuation of the distortion during zooming increases, and the fluctuation of the astigmatic difference also increases.
また条件式（２）において、上限値を越えると、球面
収差が補正過剰になると共に像面湾曲が補正不足傾向と
なり好ましくない。さらに下限値を越えると、全長・前
玉共に大となり好ましくない。In conditional expression (2), if the value exceeds the upper limit, the spherical aberration becomes overcorrected and the field curvature tends to be undercorrected, which is not preferable. If the lower limit is exceeded, both the total length and the front lens become undesirably large.
以上、各レンズ群の結像倍率を設定することにより、
本発明の目的とするズームレンズを達成できるか、更に
望ましくは以下の諸条件を満足させるとよい。As described above, by setting the imaging magnification of each lens group,
It is desirable that the zoom lens aimed at by the present invention can be achieved, or more preferably, the following various conditions are satisfied.
つまり広角端に於ける全系の焦点距離をfW、第３レン
ズ群の焦点距離をfIIIとしたとき、 0.5＜fW／fIII＜0.7 …（３） なる条件式である。That is, when the focal length of the entire system at the wide-angle end is f W and the focal length of the third lens group is f III , the following conditional expression is satisfied: 0.5 <f W / f III <0.7 (3)
条件式（３）の上限を越えると特に広角側での像面湾
曲及びコマ収差が著しく発生する一方、下限値を越える
と球面収差の補正が困難となる。If the upper limit of conditional expression (3) is exceeded, remarkable field curvature and coma aberration will occur particularly on the wide-angle side, whereas if the lower limit is exceeded, it will be difficult to correct spherical aberration.
更に又、第３レンズ群のレンズ構成を物体側から順
に、両凸の第１レンズ、物体側に強い凸面を向けた正の
第２レンズ、像側に強い凹面を向けた負の第３レンズ、
両凸の第４レンズとする一方、第２レンズと第３レンズ
との空気間隔をdIII4、第２レンズの屈折率をnIII2とし
たとき ０＜dIII4／fIII＜0.15 …（４） 1.6＜nIII2 …（５） なる条件式を満足させるとよい。Further, the lens configuration of the third lens unit is, in order from the object side, a biconvex first lens, a positive second lens with a strong convex surface facing the object side, and a negative third lens with a strong concave surface facing the image side. ,
Assuming that a biconvex fourth lens is used, the air gap between the second lens and the third lens is d III4 , and the refractive index of the second lens is n III2 , 0 <d III4 / f III <0.15 (4) 1.6 <n III2 (5) It is preferable to satisfy the following conditional expression.
条件式（４）は軸上収差と軸外収差をバランス良く補
正する為の条件であり、上限を越えるとコマ収差の発生
が著しくなり、また下限値を越えると球面収差と像面湾
曲の両方の収差補正が困難となる。Conditional expression (4) is a condition for correcting the on-axis aberration and the off-axis aberration in a well-balanced manner. When the value exceeds the upper limit, the occurrence of coma becomes remarkable. When the value exceeds the lower limit, both the spherical aberration and the field curvature occur. Is difficult to correct.
条件式（５）は球面収差を良好に補正する為のもので
あり、下限値を越えると輪帯球面収差が増し、解像力が
低下してくる。Conditional expression (5) is for favorably correcting spherical aberration. If the lower limit value is exceeded, annular spherical aberration increases and the resolving power decreases.
尚、本実施例に関するズームレンズの第１レンズ群
は、レンズ系の小型化のためにズーミング時は固定して
おり、フオーカシングの際に移動する。The first lens group of the zoom lens according to the present embodiment is fixed during zooming to reduce the size of the lens system, and moves during focusing.
又、第２レンズ群は、物体側より順に本発明のズーム
レンズは３レンズ群構成と、少ないレンズ群数で、収差
補正を行わなければならない為、各レンズ群でのズーミ
ングによる収差変動量は出来るだけ小さく抑える必要が
ある。その為、本実施例においては、第２レンズ群を物
体側より順に像側に強い凹面を向けた凹メニスカスレン
ズ、凹レンズ、物体側に強い凸面を向けた凸レンズ、若
しくは凹レンズと物体側に強い凸面を向けた凸レンズの
貼り合わせレンズの３枚のレンズで構成すると主に歪曲
収差及びコマ収差の収差変動が抑えやすくなる。次に本
発明の数値実施例を示す。数値実施例においてRiは物体
側より順に第ｉ番目のレンズ面の曲率半径、Diは物体側
より第ｉ番目のレンズ厚及び空気間隔、Niとνｉは各々
物体側より順に第ｉ番目のレンズのガラスの屈折率とア
ツベ数である。In the second lens group, since the zoom lens of the present invention has a three-lens group configuration and aberration correction must be performed with a small number of lens groups in order from the object side, the amount of aberration variation due to zooming in each lens group is small. It must be kept as small as possible. Therefore, in the present embodiment, the second lens group is formed by forming a concave meniscus lens having a strong concave surface facing the image side in order from the object side, a concave lens, a convex lens having a strong convex surface facing the object side, or a concave lens having a strong convex surface facing the object side. When the lens is composed of three lenses, that is, a cemented lens of a convex lens, the variation in distortion and coma can be suppressed easily. Next, numerical examples of the present invention will be described. In the numerical examples, Ri is the radius of curvature of the i-th lens surface in order from the object side, Di is the i-th lens thickness and air space from the object side, and Ni and νi are the i-th lens in order from the object side. These are the refractive index of the glass and the Atsube number.
R20,R21,R22の∞は光学的ローパスフイルターやIRカ
ツトフイルター等である。R20, R21, and R22 are optical low-pass filters, IR cut filters, and the like.
又前述の各条件式と数値実施例における諸数値との関
係を表−１に示す。Table 1 shows the relationship between the above-described conditional expressions and various numerical values in the numerical examples.
以上説明した様に、物体側より順に正・負・正の屈折
力を持つ３レンズ群構成のズームレンズにおいて、変倍
作用を持つ第２レンズ群、第３レンズ群の屈折力配置及
びレンズ形状を適切にすることによって、変倍比３〜3.
5倍のズームレンズを高性能でかつ小型にまとめること
が可能となる。 As described above, in a zoom lens having a three-lens group configuration having positive, negative, and positive refractive powers in order from the object side, the refractive power arrangement and lens shape of the second lens group and the third lens group having a zooming action By changing the zoom ratio from 3 to 3.
This makes it possible to combine a 5x zoom lens with high performance and small size.
第１図は本発明における３群構成のズームレンズの概略
図、 第２図〜第４図は本発明の第１〜第３実施例のレンズ断
面図、 第５図〜第７図は第１〜第３実施例の縦収差図を示す。 尚、第５図〜第７図中、（Ａ）は広角端焦点距離、
（Ｂ）は中間焦点距離、（Ｃ）は望遠端焦点距離を示
し、また、d,gはｄ線,g線の球面収差、ΔＭはメリデイ
オナル像面、ΔＳはサジタル像面を示す。 １は第１レンズ群、２は第２レンズ群、Ｓは絞り、３は
第３レンズ群、４は補正板、Ｆは結像面である。FIG. 1 is a schematic view of a three-unit zoom lens according to the present invention, FIGS. 2 to 4 are lens cross-sectional views of the first to third embodiments of the present invention, and FIGS. 7 to 10 show longitudinal aberration diagrams of the third embodiment. In FIGS. 5 to 7, (A) is the focal length at the wide-angle end,
(B) shows the intermediate focal length, (C) shows the focal length at the telephoto end, d and g show the spherical aberration of the d-line and g-line, ΔM shows the meridional image plane, and ΔS shows the sagittal image plane. 1 is a first lens group, 2 is a second lens group, S is an aperture, 3 is a third lens group, 4 is a correction plate, and F is an image plane.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，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. 6 , DB name) G02B 9/00-17/08 G02B 21/02-21/04 G02B 25/00-25/04
Claims (3)
レンズ群、負の屈折力を有する第２レンズ群、正の屈折
力を有する第３レンズ群から成り、広角端から望遠端へ
の変倍に際して、前記第１レンズ群は固定であって、前
記第２レンズ群を物体側から像面側に移動させると共に
前記第３レンズ群を像面側から物体側に移動させるズー
ムレンズにおいて、前記第２レンズ群の望遠端の結像倍
率をβ2T、前記第３レンズ群の望遠端の結像倍率をβ3T
としたとき、 0.7＜β2T／β3T＜1.25 −1.4＜β2T＜−0.7 なる条件式を満足することを特徴とするズームレンズ。1. A first lens having a positive refractive power in order from the object side.
The first lens group includes a lens group, a second lens group having a negative refractive power, and a third lens group having a positive refractive power. When the magnification is changed from the wide-angle end to the telephoto end, the first lens group is fixed. In a zoom lens that moves the second lens group from the object side to the image plane side and moves the third lens group from the image plane side to the object side, an imaging magnification at the telephoto end of the second lens group is β 2T , The imaging magnification at the telephoto end of the third lens group is β 3T
Wherein the following conditional expression is satisfied: 0.7 <β 2T / β 3T <1.25 −1.4 <β 2T <−0.7.
レンズ群、負の屈折力を有する第２レンズ群、正の屈折
力を有する第３レンズ群から成り、広角端から望遠端へ
の変倍に際して、前記第２レンズ群を物体側から像面側
に移動させると共に前記第３レンズ群を像面側から物体
側に移動させるズームレンズにおいて、前記第２レンズ
群の望遠端の結像倍率をβ2T、前記第３レンズ群の望遠
端の結像倍率をβ3T、前記第３レンズ群の焦点距離をf
III、広角端における全系の焦点距離をfWとしたとき、 0.7＜β2T／β3T＜1.25 −1.4＜β2T＜−0.7 0.5＜fW／fIII＜0.7 なる条件式を満足することを特徴とするズームレンズ。2. A first lens having a positive refractive power in order from the object side.
The zoom lens includes a lens group, a second lens group having a negative refractive power, and a third lens group having a positive refractive power. In zooming from the wide-angle end to the telephoto end, the second lens group is moved from the object side to the image plane side. And the third lens group is moved from the image plane side to the object side. The zoom magnification at the telephoto end of the second lens group is β 2T , and the imaging at the telephoto end of the third lens group is The magnification is β 3T and the focal length of the third lens group is f
III, and a focal length of the entire system at the wide angle end is set to f W, 0.7 <β 2T / β 3T <1.25 -1.4 <β 2T <-0.7 0.5 < satisfies the f W / f III <0.7 conditional expression A zoom lens characterized by the following.
レンズ群、負の屈折力を有する第２レンズ群、正の屈折
力を有する第３レンズ群から成り、広角端から望遠端へ
の変倍に際して、前記第２レンズ群を物体側から像面側
に移動させると共に前記第３レンズ群を像面側から物体
側に移動させるズームレンズにおいて、前記第３レンズ
群は、物体側より順に、両凸の第１レンズ、物体側に強
い凸面を向け正の屈折力を有する第２レンズ、像面側に
強い凹面を向け負の屈折力を有する第３レンズ、両凸の
第４レンズから成り、前記第２レンズ群の望遠端の結像
倍率をβ2T、前記第３レンズ群の望遠端の結像倍率をβ
3T、前記第３レンズ群の焦点距離をfIII、広角端におけ
る全系の焦点距離をfW、前記第３レンズ群中の第２レン
ズと第３レンズとの間の空気間隔をdIII4、前記第３レ
ンズ群中の第２レンズの屈折率をnIII2とするとき、 としたとき、 0.7＜β2T／β3T＜1.25 −1.4＜β2T＜−0.7 0.5＜fW／fIII＜0.7 ０＜dIII4／fIII0.15 1.6＜nIII2 なる条件式を満足することを特徴とするズームレンズ。3. A first lens having a positive refractive power in order from the object side.
The zoom lens includes a lens group, a second lens group having a negative refractive power, and a third lens group having a positive refractive power. In zooming from the wide-angle end to the telephoto end, the second lens group is moved from the object side to the image plane side. And the third lens group is moved from the image plane side to the object side, and the third lens group is a biconvex first lens having a strong convex surface facing the object side in order from the object side. A third lens having a negative refractive power with a strong concave surface facing the image surface side, and a biconvex fourth lens. The imaging magnification at the telephoto end of the second lens group is β. 2T , the imaging magnification at the telephoto end of the third lens group is β
3T , the focal length of the third lens group is f III , the focal length of the entire system at the wide-angle end is f W , the air gap between the second and third lenses in the third lens group is d III4 , When the refractive index of the second lens in the third lens group is n III2 , where: 0.7 <β 2T / β 3T <1.25 -1.4 <β 2T <−0.7 0.5 <f W / f III <0.7 A zoom lens satisfying the following conditional expression: 0 <d III4 / f III 0.15 1.6 <n III2 .
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22663489A JP2899019B2 (en) | 1989-09-01 | 1989-09-01 | Zoom lens |
| US07/514,726 US4991942A (en) | 1989-05-02 | 1990-04-26 | Zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22663489A JP2899019B2 (en) | 1989-09-01 | 1989-09-01 | Zoom lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0389309A JPH0389309A (en) | 1991-04-15 |
| JP2899019B2 true JP2899019B2 (en) | 1999-06-02 |
Family
ID=16848258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22663489A Expired - Lifetime JP2899019B2 (en) | 1989-05-02 | 1989-09-01 | Zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2899019B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6924938B2 (en) | 2003-03-19 | 2005-08-02 | Ricoh Company, Ltd. | Zoom lens, camera, and mobile information terminal |
| US8670187B2 (en) | 2011-10-21 | 2014-03-11 | Tamron Co., Ltd. | Zoom lens |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3008580B2 (en) * | 1991-07-12 | 2000-02-14 | キヤノン株式会社 | Zoom lens |
| JP3554366B2 (en) * | 1994-07-29 | 2004-08-18 | ペンタックス株式会社 | High-magnification real-image finder |
| JP3767155B2 (en) | 1997-09-02 | 2006-04-19 | コニカミノルタホールディングス株式会社 | Zoom lens |
-
1989
- 1989-09-01 JP JP22663489A patent/JP2899019B2/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6924938B2 (en) | 2003-03-19 | 2005-08-02 | Ricoh Company, Ltd. | Zoom lens, camera, and mobile information terminal |
| US7031074B2 (en) | 2003-03-19 | 2006-04-18 | Ricoh Company, Ltd. | Zoom lens, camera, and mobile information terminal |
| US7064902B2 (en) | 2003-03-19 | 2006-06-20 | Ricoh Company, Ltd. | Zoom lens, camera, and mobile information terminal |
| US7164541B2 (en) | 2003-03-19 | 2007-01-16 | Ricoh Company, Ltd. | Zoom lens, camera, and mobile information terminal |
| US8670187B2 (en) | 2011-10-21 | 2014-03-11 | Tamron Co., Ltd. | Zoom lens |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0389309A (en) | 1991-04-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3606548B2 (en) | 3 group zoom lens | |
| JP3147167B2 (en) | Zoom lens | |
| JPH05173071A (en) | Wide angle zoom lens | |
| JPH09325274A (en) | Zoom lens | |
| JPH05173073A (en) | Three-group zoom lens | |
| JPH05188294A (en) | Inverse telephoto type large-aperture wide-angle lens | |
| JP2558138B2 (en) | Zoom lens | |
| JP3033149B2 (en) | Compact zoom lens | |
| JP3264949B2 (en) | Zoom lens with short overall length | |
| JPH1020193A (en) | Zoom lens | |
| JPH07140388A (en) | Zoom lens | |
| JPH0659192A (en) | Zoom lens | |
| JP3412908B2 (en) | Zoom lens | |
| JP3236037B2 (en) | High zoom lens | |
| US4364641A (en) | Wide angle zoom lens | |
| JP3029148B2 (en) | Rear focus zoom lens | |
| JP3391883B2 (en) | Zoom lens | |
| JP3268824B2 (en) | Small two-group zoom lens | |
| JP4536857B2 (en) | Wide angle zoom lens | |
| JP2899019B2 (en) | Zoom lens | |
| JPH05127082A (en) | Small-sized zoom lens | |
| JP4817551B2 (en) | Zoom lens | |
| JPH0527163A (en) | Telephoto lens | |
| JP2947475B2 (en) | Zoom lens | |
| JP2811828B2 (en) | Zoom lens having simple configuration and camera having the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080312 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090312 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Year of fee payment: 11 Free format text: PAYMENT UNTIL: 20100312 |
|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Year of fee payment: 11 Free format text: PAYMENT UNTIL: 20100312 |