JPH0668575B2 - Small zoom lens - Google Patents
Small zoom lensInfo
- Publication number
- JPH0668575B2 JPH0668575B2 JP59175387A JP17538784A JPH0668575B2 JP H0668575 B2 JPH0668575 B2 JP H0668575B2 JP 59175387 A JP59175387 A JP 59175387A JP 17538784 A JP17538784 A JP 17538784A JP H0668575 B2 JPH0668575 B2 JP H0668575B2
- Authority
- JP
- Japan
- Prior art keywords
- lens
- lens group
- zoom
- group
- wide
- 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
- G02B15/143—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 three groups only
- G02B15/1431—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 three groups only the first group being positive
- G02B15/143103—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 three 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】 本発明は小型のズームレンズに関し、特にレンズシヤツ
ターカメラ、ビデオカメラ等に有効なレンズ全長（第１
レンズ面から像面までの距離）の短い小型のズームレン
ズに関するものである。The present invention relates to a small-sized zoom lens, and particularly to a total lens length (first length) effective for a lens shutter camera, a video camera, etc.
The present invention relates to a compact zoom lens having a short distance from the lens surface to the image surface).
近年レンズシヤツターカメラ、ビデオカメラ等の小型化
に伴いレンズ全長の短いズームレンズが要求されてい
る。又レンズシヤツターカメラ等のレンズ交換を行なわ
ないカメラ分野でもズームレンズの装着が要求されてお
り、従来用いられていた単焦点レンズと同程度の長さの
小型のズームレンズが要求されている。2. Description of the Related Art In recent years, zoom lenses having a short overall lens length have been demanded with the downsizing of lens shutter cameras, video cameras and the like. Further, even in the field of cameras such as lens shutter cameras where the lenses are not exchanged, a zoom lens is required to be mounted, and a small zoom lens having a length about the same as that of a conventionally used single focus lens is required.
例えば特開昭56−128911号公報では第１図に示すように
正の屈折力の第１レンズ群Ｉと負の屈折力の第２レンズ
群IIの２つのレンズ群より構成し、両レンズ群の間隔を
変化させて変倍を行う小型の２群ズームレンズが提案さ
れている。For example, in Japanese Unexamined Patent Publication No. 56-128911, as shown in FIG. 1, the first lens unit I has a positive refractive power and the second lens unit II has a negative refractive power, and the two lens units are provided. There is proposed a small-sized two-group zoom lens that changes the distance by changing the distance.
同提案では物体側より順に正と負の屈折力のレンズ群構
成とすることによりバツクフオーカスの短い機構上簡単
な構成の小型のズームレンズを達成している。In this proposal, a compact zoom lens having a short back focus and a simple structure is achieved by forming a lens group having positive and negative refracting powers in order from the object side.
しかしながら前述の２群ズームレンズでは変倍による移
動するレンズ群が２群の為に比較的レンズ群の移動を多
くしなければ所定の変倍比を得ることが困難であり、又
後群より発生する収差変動が多く、このときの収差変動
を前群で補正するのが困難であつた。However, in the above-described two-group zoom lens, since the number of lens groups that move due to zooming is two, it is difficult to obtain a predetermined zoom ratio unless the lens groups are moved relatively, and it also occurs from the rear group. However, it is difficult to correct the aberration variation at this time by the front group.
一方特公昭58−224322号公報では第２図に示すように物
体側より順に正、正そして負の屈折力の第１、第２、第
３レンズ群の３つのレンズ群より構成し前記３つのレン
ズ群を移動させて変倍を行つた３群ズームレンズが提案
されている。On the other hand, in Japanese Patent Publication No. 58-224322, as shown in FIG. 2, it is composed of three lens groups of first, second and third lens groups having positive, positive and negative refractive powers in order from the object side. A three-group zoom lens has been proposed in which the lens group is moved to perform zooming.
この３群ズームレンズは変倍による収差変動を補正する
為に３つのレンズ群を移動させているが、望遠端のレン
ズ全長がやや長くなり又広角端で歪曲収差及び非点収差
が多く発生し望遠端で球面収差が補正過剰となる傾向が
あつた。In this three-group zoom lens, three lens groups are moved in order to correct the aberration variation due to zooming, but the total lens length at the telephoto end becomes slightly longer and more distortion and astigmatism occur at the wide-angle end. At the telephoto end, spherical aberration tended to be overcorrected.
本発明は全変倍範囲にわたり良好に収差補正を行つたレ
ンズ全長の短い小型のズームレンズの提供を目的とす
る。SUMMARY OF THE INVENTION It is an object of the present invention to provide a compact zoom lens having a short overall lens length, which is excellent in aberration correction over the entire zoom range.
本発明の目的を達成する為の小型のズームレンズの主た
る特徴は物体側より順に正の屈折力を有する第１レンズ
群、正の屈折力を有する第２レンズ群そして負の屈折力
を有する第３レンズ群を有し、広角端より望遠端のズー
ム位置への変倍に際し、前記第１レンズ群と前記第３レ
ンズ群を両レンズ群の間隔を単調に減少させながら物体
側へ移動させ、前記第２レンズ群を変倍による像面変動
を補正するようにかつ望遠端のズーム位置で前記第１レ
ンズ群と前記第３レンズ群に最も接近するように物体側
へ単調移動させたことである。The main characteristics of the small-sized zoom lens for achieving the object of the present invention are, in order from the object side, a first lens group having a positive refractive power, a second lens group having a positive refractive power, and a second lens group having a negative refractive power. When the zoom lens has three lens groups and zooms from the wide-angle end to the telephoto end, the first lens group and the third lens group are moved toward the object side while monotonically decreasing the distance between the two lens groups. The second lens group is monotonically moved to the object side so as to correct the image plane variation due to zooming and to be closest to the first lens group and the third lens group at the zoom position at the telephoto end. is there.
第３図に本発明の一実施例の光学配置の概略図を示す。
同図においてＩ，II，IIIは各々第１、第２、第３レン
ズ群であり、矢印は変倍の際の移動方向を示す。FIG. 3 shows a schematic view of an optical arrangement according to an embodiment of the present invention.
In the figure, reference numerals I, II, and III respectively denote the first, second, and third lens groups, and the arrows indicate the moving directions at the time of zooming.
本発明においては３つのレンズ群を前述の如く移動させ
ることにより変倍を効率良く行うと共に、変倍による収
差変動を補正している。又本発明においては広角端にお
いて第１レンズ群と第２レンズ群との間隔を適宜な量離
すことにより第２図に示す従来例に比べ第２レンズ群へ
の近軸軸上光線の入射高を高くし球面収差の補正を容易
にしている。この結果望遠端で球面収差が補正過剰とな
る傾向を和らげている。そして広角端及び望遠端におい
て前方が正の屈折力、後方が負の屈折力の望遠タイプの
レンズ構成とすることによりレンズ全長の短縮化を図つ
ている。In the present invention, the three lens groups are moved as described above to efficiently perform zooming, and to correct aberration fluctuations due to zooming. Further, in the present invention, the distance between the first lens group and the second lens group at the wide-angle end is separated by an appropriate amount so that the incident height of the paraxial ray on the second lens group becomes higher than that of the conventional example shown in FIG. To make it easier to correct spherical aberration. As a result, the tendency for spherical aberration to be overcorrected at the telephoto end is mitigated. At the wide-angle end and the telephoto end, the overall length of the lens is shortened by using a telephoto type lens configuration in which the front has a positive refractive power and the rear has a negative refractive power.
本発明において更に全変倍範囲にわたり良好なる収差補
正を達成しレンズ全長の短縮化を図るには次の諸条件を
満足するのが好ましい。In the present invention, it is preferable to satisfy the following conditions in order to achieve good aberration correction over the entire zoom range and to shorten the total lens length.
前記第１、第２レンズ群の焦点距離を各々ｆ1，ｆ2、広
角端のズーム位置での全系の焦点距離をｆW、前記第１
レンズ群と前記第２レンズ群の広角端と望遠端のズーム
位置での間隔を各々Ｄ12W，Ｄ12T、前記第２レンズ群と
前記第３レンズ群の広角端と望遠端のズーム位置での間
隔を各々Ｄ23W，Ｄ23Tとするとき １／ｆW＜１／ｆ1＋１／ｆ2＜２／ｆW……(1) ０＜Ｄ12W−Ｄ12T＜０．２ｆW……(2) ０＜Ｄ23W−Ｄ23T＜ｆW……(3) なる条件を満足することである。The focal lengths of the first and second lens groups are f 1 and f 2 , respectively, and the focal length of the entire system at the wide-angle end zoom position is f W ,
The distances between the wide-angle end and the telephoto end of the lens group and the second lens group at the zoom positions are D 12W and D 12T , respectively, and the distances between the wide-angle end and the telephoto end of the second lens group and the third lens group at the zoom positions are respectively. When the intervals are D 23W and D 23T respectively, 1 / f W <1 / f 1 + 1 / f 2 <2 / f W ...... (1) 0 <D 12W -D 12T <0.2f W ...... (2 ) 0 <is to satisfy D 23W -D 23T <f W ...... (3) becomes a condition.
条件式(1)は第１レンズ群と第２レンズ群の屈折力の和
に関するものでありズームレンズの前方レンズ群の正の
屈折力を適切に設定し、変倍の際の収差変動を少なくし
つつレンズ全長の短縮化を図る為のものである。Conditional expression (1) relates to the sum of the refracting powers of the first lens unit and the second lens unit, and the positive refracting power of the front lens unit of the zoom lens is appropriately set to reduce aberration fluctuation during zooming. While shortening the total length of the lens.
条件式(1)の下限値を越えると両レンズ群の屈折力の和
が小さすぎバツクフオーカスが長くなりレンズ全長を短
くするのが困難となる。If the lower limit of conditional expression (1) is exceeded, the sum of the refractive powers of both lens groups will be too small, and the back focus will become long, making it difficult to shorten the total lens length.
又上限値を越えると両レンズ群の和が強くなりすぎ望遠
端で高次の収差が多く発生し又十分な変倍比及び口径比
を大きくするのが難しくなつてくる。On the other hand, if the value exceeds the upper limit, the sum of both lens groups becomes too strong, and many high-order aberrations occur at the telephoto end, and it becomes difficult to increase the sufficient zoom ratio and aperture ratio.
条件式(2)は第１レンズ群と第２レンズ群との変倍によ
る間隔変化を適切に設定し広角端と望遠端での球面収差
及び非点収差を良好に補正する為のものである。Conditional expression (2) is for properly setting the change in the distance between the first lens group and the second lens group due to zooming, and favorably correcting spherical aberration and astigmatism at the wide-angle end and the telephoto end. .
条件式(2)の上限値を越えると広角端で高次の球面収差
及び非点収差が多く発生しこれを補正するのが難しくな
り又下限値を越えると望遠端でレンズ全長が長くなりす
ぎズームレンズの小型化を図るのが難しくなつている。If the upper limit of conditional expression (2) is exceeded, it will be difficult to correct high-order spherical aberration and astigmatism at the wide-angle end, and if the lower limit is exceeded, the total lens length will become too long at the telephoto end. It is becoming difficult to reduce the size of zoom lenses.
条件式(3)は第２レンズ群と第３レンズ群との変倍によ
る間隔変化を適切に設定し、変倍による収差変動、特に
歪曲収差と倍率色収差の変動を少なくする為のものであ
る。Conditional expression (3) is for appropriately setting the change in the distance between the second lens group and the third lens group due to zooming, and for reducing aberration fluctuations due to zooming, particularly distortion and lateral chromatic aberration fluctuations. .
条件式(3)の上限値を越えると変倍による収差変動が大
きくなり、特に歪曲収差と倍率色収差の変動が大きくな
り又下限値を越えると両レンズ群の間隔変化が少なくな
り変倍比を十分確保するのが難しくなる。If the upper limit of conditional expression (3) is exceeded, the variation of aberrations due to zooming will become large, and especially the variation of distortion and lateral chromatic aberration will become large, and if the lower limit is exceeded, the change in the distance between both lens groups will be small and the zoom ratio will be reduced. It will be difficult to secure enough.
尚本発明においてレンズ構成の簡素化を図りつつ良好な
る収差補正を達成するには物体側より順に第１レンズ群
を正、負そして正の屈折力の３つのレンズ、第２レンズ
群を両レンズ面が凸面の１つのレンズ、第３レンズ群を
像面側に凸面を向けた正の屈折力のメニスカス状のレン
ズと負の屈折力のレンズの２つのレンズで構成するのが
好ましい。In the present invention, in order to achieve good aberration correction while simplifying the lens structure, the first lens group is composed of three lenses having positive, negative, and positive refractive powers in order from the object side, and the second lens group is composed of both lenses. It is preferable that one lens having a convex surface and the third lens group be composed of two lenses, a meniscus lens having a positive refractive power and a lens having a negative refractive power, with the convex surface facing the image side.
又本発明においてフオーカシングは第１レンズ群を繰り
出して行うのが収差補正上好ましいが第１レンズ群と第
２レンズ群を一体的に移動させても、又第３レンズ群の
み移動させても又は全レンズ群を移動させて行つても良
い。In the present invention, focusing is preferably performed by extending the first lens group in order to correct aberrations. However, even if the first lens group and the second lens group are moved integrally, or only the third lens group is moved, or You may move by moving all the lens groups.
以上のように本発明によれば全変倍範囲にわたり良好に
収差補正を行つた小型のズームレンズを達成することが
できる。As described above, according to the present invention, it is possible to achieve a small-sized zoom lens that favorably corrects aberrations over the entire zoom range.
次に本発明の数値実施例を示す。数値実施例においてＲ
i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。Next, numerical examples of the present invention will be shown. R in numerical examples
i is the radius of curvature of the i-th lens surface in order from the object side, D i
Is the i-th lens thickness and air gap from the object side, and N i and ν i are the refractive index and the Abbe number of the glass of the i-th lens in order from the object side.
数値実施例１ 数値実施例２ 数値実施例３ Numerical Example 1 Numerical Example 2 Numerical Example 3
第１図、第２図は各々従来の２群ズームレンズと３群ズ
ームレンズの光学系の概略図、第３図は本発明のズーム
レンズの光学系の概略図、第４、第５、第６図は各々本
発明の数値実施例１、２、３のレンズ断面図、第７図
(A)，(B)，(C)、第８図(A)，(B)，(C)、第９図(A)，
(B)，(C)は各々本発明の数値実施例１、２、３の諸収差
図である。 図中Ｉ，II，IIIは各々第１、第２、第３レンズ群、
(A)，(B)，(C)は各々広角端、中間、望遠端での諸収差
図、ｄはｄ線、ｇはｇ線、ΔＳはサジタル、ΔＭはメリ
デイオナル像面を示す。FIGS. 1 and 2 are schematic diagrams of optical systems of conventional two-group zoom lens and three-group zoom lens, respectively, and FIG. 3 is a schematic diagram of the optical system of the zoom lens of the present invention. 6 is a lens cross-sectional view of Numerical Embodiments 1, 2, and 3 of the present invention, and FIG.
(A), (B), (C), FIG. 8 (A), (B), (C), FIG. 9 (A),
(B) and (C) are aberration diagrams of Numerical Examples 1, 2, and 3 of the present invention, respectively. In the figure, I, II, and III are the first, second, and third lens groups, respectively.
(A), (B), and (C) are various aberration diagrams at the wide-angle end, the middle, and the telephoto end, respectively, d is the d line, g is the g line, ΔS is the sagittal, and ΔM is the meridional image plane.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 中山 博喜 神奈川県川崎市高津区下野毛770番地 キ ヤノン株式会社玉川事業所内 (56)参考文献 特開 昭58−224322（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroki Nakayama 770 Shimonoge, Takatsu-ku, Kawasaki-shi, Kanagawa Canon Inc. Tamagawa Plant (56) Reference JP-A-58-224322 (JP, A)
Claims (1)
ンズ群、正の屈折力を有する第２レンズ群そして負の屈
折力を有する第３レンズ群の３つのレンズ群を有し、広
角端より望遠端のズーム位置への変倍に際し、前記第１
レンズ群と前記第３レンズ群を両レンズ群の間隔を単調
に減少させながら物体側へ移動させ、前記第２レンズ群
を変倍による像面変動を補正するようにかつ望遠端のズ
ーム位置で前記第１レンズ群と前記第３レンズ群に最も
接近するように物体側へ単調移動させており、前記第
１，第２レンズ群の焦点距離を各々ｆ1，ｆ2、広角端の
ズーム位置での全系の焦点距離をｆW、前記第１レンズ
群と前記第２レンズ群の広角端と望遠端のズーム位置で
の間隔を各々Ｄ12W，Ｄ12T、前記第２レンズ群と前記第
３レンズ群の広角端と望遠端のズーム位置での間隔を各
々Ｄ23W，Ｄ23Tとするとき １／ｆW＜１／ｆ1＋１／ｆ2＜２／ｆW ０＜Ｄ12W−Ｄ12T＜０．２ｆW ０＜Ｄ23W−Ｄ23T＜ｆW なる条件を満足することを特徴とする小型のズームレン
ズ。1. A first lens group having a positive refracting power, a second lens group having a positive refracting power, and a third lens group having a negative refracting power in order from the object side. When changing the zoom position from the wide-angle end to the telephoto end,
The lens group and the third lens group are moved toward the object side while monotonically decreasing the distance between the two lens groups, and the second lens group is corrected at the zoom position at the telephoto end so as to correct the image plane variation due to zooming. The first lens group and the third lens group are moved to the object side so that they are closest to each other, and the focal lengths of the first and second lens groups are f 1 and f 2 , respectively, and the zoom position at the wide-angle end. total focal distance f W of at, the respective D 12W apart at the zoom position of the wide-angle end and the telephoto end of the first lens and the second lens group and group, D 12T, the said second lens group first When the distances between the wide-angle end and the telephoto end of the three lens groups at the zoom position are D 23W and D 23T , respectively, 1 / f W <1 / f 1 + 1 / f 2 <2 / f W 0 <D 12W −D 12T <0.2f W 0 <D 23W -D 23T < compact zoom lens which satisfies the f W condition:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59175387A JPH0668575B2 (en) | 1984-08-23 | 1984-08-23 | Small zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59175387A JPH0668575B2 (en) | 1984-08-23 | 1984-08-23 | Small zoom lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6152620A JPS6152620A (en) | 1986-03-15 |
| JPH0668575B2 true JPH0668575B2 (en) | 1994-08-31 |
Family
ID=15995216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59175387A Expired - Fee Related JPH0668575B2 (en) | 1984-08-23 | 1984-08-23 | Small zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0668575B2 (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2619632B2 (en) * | 1986-12-25 | 1997-06-11 | オリンパス光学工業株式会社 | Compact high-magnification zoom lens |
| JP2791563B2 (en) * | 1987-11-13 | 1998-08-27 | オリンパス光学工業株式会社 | Compact high-magnification zoom lens |
| JP2798090B2 (en) * | 1988-02-10 | 1998-09-17 | オリンパス光学工業株式会社 | Focusing method of zoom lens |
| JP2817916B2 (en) * | 1988-03-25 | 1998-10-30 | 旭光学工業株式会社 | Zoom lens for high zoom ratio compact camera |
| JP2767804B2 (en) * | 1988-03-31 | 1998-06-18 | ミノルタ株式会社 | Compact high-magnification zoom lens system |
| JP2947474B2 (en) * | 1988-07-05 | 1999-09-13 | ミノルタ株式会社 | Compact high-magnification zoom lens system |
| JP2947473B2 (en) * | 1988-07-05 | 1999-09-13 | ミノルタ株式会社 | Compact high-magnification zoom lens system |
| JP2767805B2 (en) * | 1988-03-31 | 1998-06-18 | ミノルタ株式会社 | Compact high-magnification zoom lens system |
| JP2596796B2 (en) * | 1988-06-29 | 1997-04-02 | オリンパス光学工業株式会社 | Focusing method of zoom lens |
| US5424870A (en) * | 1990-07-20 | 1995-06-13 | Minolta Camera Kabushiki Kaisha | Compact zoom lens system |
| JP3060557B2 (en) * | 1991-02-15 | 2000-07-10 | オリンパス光学工業株式会社 | Compact 3-group zoom lens |
| JP3260798B2 (en) * | 1991-03-04 | 2002-02-25 | オリンパス光学工業株式会社 | Wide-angle zoom lens |
| JP3799738B2 (en) * | 1997-04-18 | 2006-07-19 | 株式会社ニコン | Zoom lens barrel |
| JP6971766B2 (en) * | 2017-10-16 | 2021-11-24 | キヤノン株式会社 | Optical system and image pickup device using it |
| JP6807139B2 (en) * | 2018-07-17 | 2021-01-06 | カンタツ株式会社 | Imaging lens |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5850327A (en) * | 1981-09-19 | 1983-03-24 | Kamizaki Kokyu Koki Seisakusho Kk | Speed change gear of moving working car |
| JPS58224322A (en) * | 1982-06-23 | 1983-12-26 | Konishiroku Photo Ind Co Ltd | Small-sized three-group zoom lens |
-
1984
- 1984-08-23 JP JP59175387A patent/JPH0668575B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6152620A (en) | 1986-03-15 |
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