JPS59222806A - Zoom lens - Google Patents
Zoom lensInfo
- Publication number
- JPS59222806A JPS59222806A JP58097178A JP9717883A JPS59222806A JP S59222806 A JPS59222806 A JP S59222806A JP 58097178 A JP58097178 A JP 58097178A JP 9717883 A JP9717883 A JP 9717883A JP S59222806 A JPS59222806 A JP S59222806A
- Authority
- JP
- Japan
- Prior art keywords
- lens group
- lens
- refractive power
- zooming
- object side
- 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.)
- Granted
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
- G02B15/16—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/177—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
-
- 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
- G02B15/144—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 four groups only
- G02B15/1445—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 four groups only the first group being negative
- G02B15/144511—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 four groups only the first group being negative arranged -+-+
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Lenses (AREA)
Abstract
Description
【発明の詳細な説明】
本発明はズームレンズに関し、特に物体側の第１レンズ
群が負の屈折力である’ｒ Ｔ Ｌ ３ ５ ミ！ｊ
一眼し’７カメラ用ズームレンズの主に標準レンズもし
くはそれより短い焦点距離から始まりズーム倍率が２〜
３クラスのズームレンズに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a zoom lens, and in particular, the first lens group on the object side has a negative refractive power. j
Zoom lenses for single-lens '7 cameras mainly start with standard lenses or shorter focal lengths with zoom magnifications of 2 to 2.
Regarding 3 class zoom lenses.
従来、物体側より順に、負の屈折力の第１レンズ群、正
の屈折力の第２レンズ群および負の屈折力の第３レンズ
群で構成され、それらのレンズ群が、独立に移動してズ
ーミングを行うズームレンズがＢＰ ３９８３０７，特
開昭５ ４−２６７５４特開昭５７−５０２３ など
で提案されている。これらのタイプのズームレンズは負
の屈折力と正の屈折力の２つのレンズ群で構成されるズ
ームレンズに比べ高倍率に出来、しかもある程度コンパ
クトにすることが容易となる利点がある。Conventionally, in order from the object side, it is composed of a first lens group with negative refractive power, a second lens group with positive refractive power, and a third lens group with negative refractive power, and these lens groups move independently. Zoom lenses that perform zooming have been proposed in BP 398307, Japanese Patent Application Laid-Open No. 5-4-26754, Japanese Patent Application Laid-Open No. 57-5023, and the like. These types of zoom lenses have the advantage that they can have higher magnification than zoom lenses that are composed of two lens groups, one with negative refractive power and the other with positive refractive power, and can be made more compact to some extent.
しかしながら、さらにコンパクト化を進め、もしくは広
角端のズーム位置で大画角化を図った場合、各レンズ群
の屈折力が強くなるためズーミングもしくはフォーカシ
ング（第ルンズ群でフォーカシングを行う場合）による
諸収差の変動が大きくなり高性能化もしくは大口径化を
実現することは極めて困雌とされていた。特に第ルンズ
群の屈折力が強くなると、フォーカシングとズーミング
による収差変動、第２レンズ群の屈折力が強くなるとズ
ーミングによる収差変動が犬きくなる傾向がある。However, when further downsizing or increasing the angle of view at the wide-angle end zoom position, the refractive power of each lens group becomes stronger, resulting in various aberrations due to zooming or focusing (when focusing is performed with the 1st lens group). It was considered extremely difficult to achieve higher performance or a larger diameter due to the large fluctuations in the diameter. In particular, when the refractive power of the second lens group becomes strong, aberration fluctuations due to focusing and zooming tend to become sharper, and when the refractive power of the second lens group becomes strong, aberration fluctuations due to zooming tend to become sharper.
本発明は、上記従来例の欠点である、コンパクト化と広
角端のズーム位置での大画角化による性能劣化を防いだ
高性能のズームレンズの提供を目的とする。An object of the present invention is to provide a high-performance zoom lens that prevents performance deterioration due to compactness and a large angle of view at the wide-angle end zoom position, which are the drawbacks of the conventional example.
本発明のズームレンズの主たる特徴は、物体側より順に
負の屈折力の第１【メンズ群、正の屈折力の第２レンズ
群、負の屈折力の第３レンズ群そして正の屈折力の第４
レンズ群の４つのレンズ群を有し、ズーミングに際し、
第ルンズ群、第２レンズ群、第３レンズ群をそれぞれ独
立に移動させることである。そして更に好ましくは第ル
ンズ群と第２レンズｌ洋は望遠端で最も接近し、第３レ
ンズ群は広角端で第４レンズ群に最も接近する配置にす
ることである。そしてより良好なる収差補正を達成する
為には第ルンズ群から第４レンズ群までの焦点距離と望
遠端での全系の焦点距離をそれぞれ／、 、 ／２．
ｆ、。The main features of the zoom lens of the present invention are that, in order from the object side, the first lens group has a negative refractive power; the second lens group has a positive refractive power; the third lens group has a negative refractive power; Fourth
It has four lens groups, and when zooming,
This is to move the first lens group, second lens group, and third lens group independently. More preferably, the lens group and the second lens group are closest to each other at the telephoto end, and the third lens group is closest to the fourth lens group at the wide-angle end. In order to achieve better aberration correction, the focal length from the 4th lens group to the 4th lens group and the focal length of the entire system at the telephoto end should be set to /, , /2, respectively.
f.
ｆ−、ｆｒとした時、
（１） １ ＜ Ｌ ／ ｆＴ ＜ ８■ ０．５
＜ １ｆ１１ ／ Ｌｒ ＜ １．２■ ｆｔ＜
＋ｆ＋＋ ＜ ＋ｆｓ＋ ＜ ｆ＜の各条件を満たすこ
とである。When f-, fr, (1) 1 < L / fT < 8 ■ 0.5
<1f11/Lr<1.2■ ft<
This is to satisfy the following conditions: +f++ < +fs+ <f<.
本発明の主たる特徴はまず、ズーミング中固定の正の屈
折力の第４レンズ群が配されていることである。この為
第ルンズ群から第３レンズ群までは正の屈折力を持つた
め、その屈折力は第ルンズ群から第４レンズ群（全系）
の正の屈折力に比べて弱くなっている。このことは第ル
ンズ群から第３レンズ群までの屈折力を従来に対し、弱
くすることが出来、この結果高性能化がより容易となる
。また、第ルンズ群と第２レンズ群の屈折力を従来と同
じにした場合、第３レンズ群の負の屈折力は従来より強
くすることが出来、ズーミングによる各レンズ群の少な
い移動量でズーム倍率をかせぐことが可能となり、より
コンパクト化が実現出来る。この効果を最大限出すため
には広角端と望遠端での各レンズ群の配ＩＦ’Ｑを上記
４７１４成にするのが好ましい。つまり、広角端から望
遠端へズーミングする時、第２レンズ群が物体側方向へ
移動し、この時、第３レンズ群は第２レンズ群と同じ物
体側方向へ移動させることである。この第２レンズ？１
〔に対する第３レンズ群の移動量の比を制御することに
よりコンパクト化と高性能化を両立させることが容易と
なる。この移動量の比を大きくして行くと、ズーミング
による収差変動は減る傾向になるが、望遠端での全長（
第１面からフィルム面一までの距離）が長くなり、さら
に進めると広角端での全長より長くなってしまう。また
、移動量の比を小さくして行くと、上記と逆の傾向とな
る。従って望遠端の全長が広角端の全長より長くならな
い範囲（コンパクト化の限界）で高性能化を図るのが最
も好ましい。The main feature of the present invention is that a fourth lens group having a positive refractive power that is fixed during zooming is provided. For this reason, the lens group from the 1st lens group to the 3rd lens group has positive refractive power, so the refractive power is
Its positive refractive power is weaker than that of . This allows the refractive power from the first lens group to the third lens group to be made weaker than in the past, making it easier to improve performance. In addition, if the refractive power of the 1st lens group and the 2nd lens group are kept the same as before, the negative refractive power of the 3rd lens group can be made stronger than before, allowing zooming with less movement of each lens group. It becomes possible to increase the magnification and achieve more compactness. In order to maximize this effect, it is preferable to set the arrangement IF'Q of each lens group at the wide-angle end and the telephoto end to the above-mentioned 4714 configuration. That is, when zooming from the wide-angle end to the telephoto end, the second lens group moves in the object side direction, and at this time, the third lens group moves in the same direction as the second lens group. This second lens? 1
By controlling the ratio of the amount of movement of the third lens group to [, it becomes easy to achieve both compactness and high performance. As the ratio of this movement amount increases, aberration fluctuations due to zooming tend to decrease, but the overall length at the telephoto end (
The distance from the first surface to the plane of the film becomes longer, and if it is further advanced, it becomes longer than the total length at the wide-angle end. Furthermore, when the ratio of the moving amounts is decreased, the opposite tendency to the above occurs. Therefore, it is most preferable to achieve high performance within a range where the total length at the telephoto end is not longer than the total length at the wide-angle end (the limit of compactness).
この時、ズーム倍率を最も効率良く行っているのは第２
レンズ群であり、コンパクト化を保つには、２９２レン
ズ群を効率良く移動させる必要があり、少なくとも望遠
端において、第ルンズｆｉｌと第２レンズ群ｆ：最も接
近させておくのが好祉しい。At this time, the second zoom magnification is the most efficient.
In order to keep the lens group compact, it is necessary to move the 292 lens group efficiently, and it is preferable to make the 2nd lens fil and the 2nd lens group f closest to each other at least at the telephoto end.
また、第３レンズ群および第４レンズ群はそれ稈屑折力
が強くないので、広角端においてレンズ全長の短縮およ
びバックフォーカスを必要量確保するため、第３レンズ
群と第４レンズ群は広角端で最も接近させることが好ま
しい。この場合第３レンズ群と第４レンズ群はどのよう
な動きをしてもよく、広角端で最も接近する移動軌跡を
描くようなものであればよい。尚、第２レンズ群を物体
側へ移動させるかわりに、像面側に移動させ、それと共
［第３レンズを洋も像面側へ移動させても良い。In addition, the third and fourth lens groups do not have strong culm refracting power, so in order to shorten the overall lens length and secure the necessary amount of back focus at the wide-angle end, the third and fourth lens groups are used at the wide-angle end. Closest proximity at the edges is preferred. In this case, the third lens group and the fourth lens group may move in any manner as long as they draw a movement trajectory that approaches them most at the wide-angle end. Incidentally, instead of moving the second lens group toward the object side, it may be moved toward the image plane side, and at the same time, the third lens group may also be moved toward the image plane side.
次にφ件の、■、Ｏについて述べる。Next, we will discuss φ items, ■, and O.
条件■・■・■は各レンズ群の屈折力を制限するもので
あり、特にＴＴＬ３５ミリ−〇艮しフカメラ用ズームレ
ンズを実現する時にコンパクト化と高性能化の双方を良
好に達成する為のものである。条件■の下限値以下では
第４レンズ群を単純なレンズ淘成にすることが困帷とな
り、大型化してしまい父上限値以上では第４レンズ群の
屈折力が弱く成り過ぎ、コンパクト・高性能の効果→；
うすれて来る。条件■の下限値以下では、広角端より望
遠端の方が全長が長くなる傾向となり、さらに望遠端で
大口径化もしくは球面収差を良好に補正することが…娯
となる。Conditions ■・■・■ limit the refractive power of each lens group, and are particularly important for achieving both compactness and high performance when realizing a zoom lens for a TTL 35mm camera. It is something. Below the lower limit of condition (2), it becomes difficult to make the 4th lens group a simple lens, making it large, and above the upper limit, the refractive power of the 4th lens group becomes too weak, making it compact and high-performance. The effect of →;
It's starting to fade. Below the lower limit of condition (2), the overall length tends to be longer at the telephoto end than at the wide-angle end, and it would be interesting to increase the aperture or better correct spherical aberration at the telephoto end.
上限値以上では広角端の全長の短縮化がもの足りなくな
る。また、第２レンズ群は倍率をかせぐ働きをするため
最も屈折力を強くする必要があり、第ルンズ群ｄ：前玉
径もしくはフォーカシングによる繰出批を制御するため
第２レンズ群の次に屈折力が強く、第：３レンズ群は倍
率とズーミングによる収差変動、第４レンズ群は主にズ
ーミングによる収差変動を除去する働きのため屈折力は
第１．第２レンズ群よりも弱くするのが好ましい。これ
が条件■である。If the value exceeds the upper limit, the overall length at the wide-angle end will not be shortened enough. In addition, the second lens group must have the strongest refractive power because it works to increase magnification, and the second lens group d: has the next highest refractive power after the second lens group in order to control the front lens diameter or the extension due to focusing. The refractive power of the 3rd lens group is strong, and the 3rd lens group works to eliminate aberration fluctuations due to magnification and zooming, and the 4th lens group mainly works to remove aberration fluctuations due to zooming, so the refractive power is the 1st. It is preferable to make it weaker than the second lens group. This is condition (■).
次に正の屈折力の第４レンズ群の収差論的作用効果につ
いて述べる。Next, the aberrational effects of the fourth lens group having positive refractive power will be described.
表１に見る如く、第４レンズ群はズーミング中球面収差
（ＳＡ）は一定であるが、一定でない収差も多くあり、
コマ収差（ＣＭ）は広角端で最も多く外向性のコマを発
生している。〜般［負の屈折力が先行するズーノ・タイ
プにおいて広角端を大画角とし、しかもコンパクトしよ
うとすると広角端付近の軸外光束の主光線近傍では内向
性のコマが出やすい傾向を持っている。この為に本実施
例のズームレンズでは従来多く発生しがちな内向性のコ
マを打ち消すのにこの外向性のコマは非常に有効となる
。また望遠側では小さい値となっており、悪影響は少な
い。このように本発明の実施例のズームレンズにおいて
は第４レンズ群は、第１〜第３レンズ群から発生する交
流成分の収差（ズーミングにより異なるけ）を打ち消す
作用効果を持っている。従って従来の３群第１９成のズ
ームレンズ（全系で収差が除去されている）と像面の間
にいわゆるリア・アタッチメントレンズ（これのみで収
差が除去されている）を装着したレンズ系に対し、本発
明は根本的に作用効果を異にし、ている。As shown in Table 1, the spherical aberration (SA) of the fourth lens group is constant during zooming, but there are many aberrations that are not constant.
Comatic aberration (CM) causes extroverted coma most often at the wide-angle end. ~General [Zoono type, which has a negative refractive power, has a large angle of view at the wide-angle end, and if you try to make it compact, there is a tendency for inward coma to appear near the chief ray of the off-axis beam near the wide-angle end. There is. For this reason, in the zoom lens of this embodiment, this extroverted coma is very effective in canceling out the introverted coma that tends to occur conventionally. Furthermore, the value is small on the telephoto side, so there is little negative effect. As described above, in the zoom lens according to the embodiment of the present invention, the fourth lens group has the effect of canceling out the aberration (which varies depending on zooming) of the AC component generated from the first to third lens groups. Therefore, a lens system with a so-called rear attachment lens (aberrations removed only by this lens) between a conventional zoom lens with 3 groups and 19 components (aberrations are removed in the entire system) and the image plane. In contrast, the present invention has fundamentally different effects.
また、通常は第ルンズｊトを繰り出すことにより異なる
′肉体距離に対しフォーカシングを行うが、自動焦点合
せ（幾４ｉｊ＜を備えたレンズもしくはカメラに対して
は第３レンズ群もしく ６ｓｔ弔４レンズ群でフォーカ
シングを行うこともｒｊＪ能である。In addition, focusing is normally performed at different physical distances by extending the lens, but for lenses or cameras equipped with automatic focusing (a lens or camera with an automatic focus), the third lens group or the 6th lens is used. Focusing in groups is also an rjj ability.
次に本発明の数値実施例を示す。数値実施例１〆ζおい
て１員は物体側より順に第１番目のレンズ面の曲率半径
、Ｄｉは物体側より順に第１番目のレンズ厚及び空気間
隔、Ｎｉとνｉは夫々物体側より順に第ｉ？ｔν目のレ
ンズのガラスの屈折率とアツベ数である。Next, numerical examples of the present invention will be shown. Numerical Example 1 In ζ, the first member is the radius of curvature of the first lens surface in order from the object side, Di is the first lens thickness and air distance in order from the object side, and Ni and νi are respectively in order from the object side. The ith? These are the refractive index and Abbe number of the glass of the tν-th lens.
実施例１はズーム倍率２．８２で画角７２゜３°〜２９
°、ＦＮＯ４の仕様であり開口絞りはＧ６とＧ７の間に
備えている。Example 1 has a zoom magnification of 2.82 and an angle of view of 72°3° to 29°.
°, FNO4 specification, and the aperture diaphragm is provided between G6 and G7.
実施例２はズーム倍率１．９２で画角４７．６°〜２６
°、ＦＮＯ４〜４．５の仕様であり開［」収りはＧ７と
Ｇ８の間の■（１５である。Example 2 has a zoom magnification of 1.92 and an angle of view of 47.6° to 26°.
°, FNO 4 to 4.5 specifications, and the opening range is 15 between G7 and G8.
数ｎｕ実施例Ｉ
Ｐｍ２Ｏ３−２８２，４Ｆ’Ｎ０＝１：４ ２（ｌｌ
＝７２．３°〜２９．０゜数値実施例２
Ｐｍ１Ｏ０−１９２ＦＮＯ＝１：４〜４．５ ２（ｌＪ
＝４７．６°〜２６８１２Ｂ＝ −３３４，０２
（実施例１の３次収差係数）
開口絞りは第２レンズ群内（Ｇ６とＧ７の中間）に置い
である、
Ｌ：軸上色収差 ＳＡ：球面収差
Ｔ：倍率色収差 ＣＭ二コマ収差
ＡＳ：非点収差
ＰＴ：ペッツバール和
ＤＳ：歪曲収差Number nu Example I Pm2O3-282,4F'N0=1:4 2(ll
=72.3°~29.0° Numerical Example 2 Pm1O0-192FNO=1:4~4.5 2(lJ
=47.6°~26812B= -334,02 (Third-order aberration coefficient of Example 1) The aperture stop is placed in the second lens group (between G6 and G7), L: Axial chromatic aberration SA: Spherical surface Aberration T: Lateral chromatic aberration CM dicoma aberration AS: Astigmatism PT: Petzval sum DS: Distortion aberration
第１図、第２図は本発明のズームレンズの数値実施例１
，２のレンズ断面図、
第３図、第４図は本発明のズームレンズの数値実施例１
．２の諸収差図である。
図中、６Ｍはメリデイオナル作面、△Ｓはサジタル隊面
である。
代理人 丸島義−！・・ｆ
ｋ・１、−・、ｉｊFigures 1 and 2 are numerical example 1 of the zoom lens of the present invention.
, 2, and 3 and 4 are numerical example 1 of the zoom lens of the present invention.
．． FIG. 2 is a diagram showing various aberrations of No. 2. In the figure, 6M is the meridional plane and ΔS is the sagittal plane. Agent Yoshi Marushima!・・f k・1, −・, ij
Claims (3)
群そして正の屈折力の第４レンズ群の４つのレンズ群を
有し、ズーミングに際し、前記第ルンズ群第２レンズ群
および第３レンズ群がそれぞれ独立に移動することを特
徴とするズームレンズ。(1) A lens group with negative refractive power in order from the object side. It has four lens groups: a second lens group with positive refractive power, a third lens group with negative refractive power, and a fourth lens group with positive refractive power. A zoom lens characterized in that each third lens group moves independently.
で最も接近し、第３レンズ群は広角端で第４レンズ群に
最も接近することを特徴とする特許請求の範囲第１項記
載のズームレンズ。(2) The first lens group and the second lens 11'' are closest to each other at the telephoto end, and the third lens group is closest to the fourth lens group at the wide-angle end. zoom lens.
距離をそれぞれｆ、、 ｆ２． ｆ３． ｆ、とし望遠
端における全系の焦点距離をｆｒとした時、■ １
＜ ｆ＋ ／ ｆｒ ＜ ８■ ０．５ ＜ ｌＪ’＋
ｌ ／ ｆＴ ＜ １．２■ ｆ２ ＜ １ｆ１１
＜ １ｆｓｌ ＜ ｆ４なる条件を満足することを特徴
とする特許求の範囲第２項記載のズームレンズ。(3) Let the focal lengths from the fourth lens group to the fourth lens group be f, f2, . f3. f, and the focal length of the entire system at the telephoto end is fr, then ■ 1
< f+ / fr < 8 ■ 0.5 <lJ'+
l / fT < 1.2 ■ f2 < 1f11
A zoom lens according to claim 2, characterized in that it satisfies the following condition: <1 fsl < f4.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58097178A JPS59222806A (en) | 1983-06-01 | 1983-06-01 | Zoom lens |
| US06/903,901 US4687302A (en) | 1983-06-01 | 1986-09-04 | Zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58097178A JPS59222806A (en) | 1983-06-01 | 1983-06-01 | Zoom lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59222806A true JPS59222806A (en) | 1984-12-14 |
| JPH0248088B2 JPH0248088B2 (en) | 1990-10-24 |
Family
ID=14185326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58097178A Granted JPS59222806A (en) | 1983-06-01 | 1983-06-01 | Zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59222806A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4818082A (en) * | 1988-05-27 | 1989-04-04 | Eastman Kodak Company | Compact wide-angle close-focus SLR zoom lens |
| US4828372A (en) * | 1987-10-09 | 1989-05-09 | Eastman Kodak Company | Wide-angle zoom lens |
| JPH0392808A (en) * | 1989-09-05 | 1991-04-18 | Canon Inc | Zoom lens |
| JP2011150289A (en) * | 2009-12-22 | 2011-08-04 | Canon Inc | Zoom lens |
| WO2012086155A1 (en) * | 2010-12-22 | 2012-06-28 | パナソニック株式会社 | Zoom lens system, interchangeable lens device, and camera system |
| JP2014026211A (en) * | 2012-07-30 | 2014-02-06 | Canon Inc | Zoom lens and image capturing device having the same |
| JP2015172694A (en) * | 2014-03-12 | 2015-10-01 | 株式会社ニコン | Zoom lens, optical device, and method for manufacturing zoom lens |
| JP2019204114A (en) * | 2019-07-29 | 2019-11-28 | キヤノン株式会社 | Optical system and image capturing device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS492312A (en) * | 1972-04-24 | 1974-01-10 | ||
| JPS5334539A (en) * | 1976-09-13 | 1978-03-31 | Tokina Optical | Wide angle high zoom ratio zoom system |
-
1983
- 1983-06-01 JP JP58097178A patent/JPS59222806A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS492312A (en) * | 1972-04-24 | 1974-01-10 | ||
| JPS5334539A (en) * | 1976-09-13 | 1978-03-31 | Tokina Optical | Wide angle high zoom ratio zoom system |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4828372A (en) * | 1987-10-09 | 1989-05-09 | Eastman Kodak Company | Wide-angle zoom lens |
| US4818082A (en) * | 1988-05-27 | 1989-04-04 | Eastman Kodak Company | Compact wide-angle close-focus SLR zoom lens |
| JPH0392808A (en) * | 1989-09-05 | 1991-04-18 | Canon Inc | Zoom lens |
| JP2011150289A (en) * | 2009-12-22 | 2011-08-04 | Canon Inc | Zoom lens |
| WO2012086155A1 (en) * | 2010-12-22 | 2012-06-28 | パナソニック株式会社 | Zoom lens system, interchangeable lens device, and camera system |
| US8611019B2 (en) | 2010-12-22 | 2013-12-17 | Panasonic Corporation | Zoom lens system, interchangeable lens apparatus and camera system |
| JP5891452B2 (en) * | 2010-12-22 | 2016-03-23 | パナソニックＩｐマネジメント株式会社 | Zoom lens system, interchangeable lens device and camera system |
| JP2014026211A (en) * | 2012-07-30 | 2014-02-06 | Canon Inc | Zoom lens and image capturing device having the same |
| JP2015172694A (en) * | 2014-03-12 | 2015-10-01 | 株式会社ニコン | Zoom lens, optical device, and method for manufacturing zoom lens |
| JP2019204114A (en) * | 2019-07-29 | 2019-11-28 | キヤノン株式会社 | Optical system and image capturing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0248088B2 (en) | 1990-10-24 |
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