JPS58137813A - Small-sized zoom lens - Google Patents
Small-sized zoom lensInfo
- Publication number
- JPS58137813A JPS58137813A JP57018901A JP1890182A JPS58137813A JP S58137813 A JPS58137813 A JP S58137813A JP 57018901 A JP57018901 A JP 57018901A JP 1890182 A JP1890182 A JP 1890182A JP S58137813 A JPS58137813 A JP S58137813A
- Authority
- JP
- Japan
- Prior art keywords
- lens group
- lens
- focal length
- groups
- optical axis
- 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
-
- 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)
- Nonlinear Science (AREA)
- Lenses (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、特にレンジファインダカメラのように携帯性
が間艶となるカメラに適した小型のズームレンズに関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compact zoom lens particularly suitable for cameras such as rangefinder cameras where portability is essential.
レンジファインダカメラの普及に伴って、ズームレンズ
を装着したレンジファインダカメラへの要望が高まって
きている。しかし、レンジファインダカメラは携帯性が
問題であり、従来のｌ眼しフカメラ用のズームレンズは
コンノくクト註に問題があった。With the spread of rangefinder cameras, the demand for rangefinder cameras equipped with zoom lenses has increased. However, rangefinder cameras have a problem with portability, and conventional zoom lenses for single-lens cameras have problems with their design.
すなわち、従来のズームレンズにおいては、正レンズ群
と負レンズ群の組合ぜで５倍分行うものが多いが、ズー
ムレンズ系に変倍のための骨
負のレンズ群ｉ含むことけレンズ系の全長を短かくする
のには不利であった。In other words, in many conventional zoom lenses, a combination of a positive lens group and a negative lens group performs 5x magnification. It was disadvantageous to shorten the overall length.
本発明は、２つの正の焦点距離を有するレンズ群の間隔
を変化させて変倍を行うことにより、レンズ系の津側主
点を第ルンズ群近傍に維持し、第ルンズ群から澹面まで
の距＠を、レンズ全系の焦点距離に近い長さとすること
が出来、小型のズームレンズを得ることが出来た。The present invention maintains the principal point on the side of the lens system in the vicinity of the lens group by changing the distance between two lens groups having positive focal lengths, and extends the distance from the lens group to the lens group. It was possible to make the distance @ close to the focal length of the entire lens system, and it was possible to obtain a compact zoom lens.
すなわち、ズームレンズけ３レンズ群によって構成され
るものとし、第ルンズ群の焦点距離をｆｌ、第２レンズ
群の焦点距離をｆ２、第３レンズ群の焦点距離をｆ、と
し、第ルンズ群と第２レンズ群の王点関距離をｔ４、第
２レンズ群と第３レンズ群の主点関距畦をｔ２、第３レ
ンズ群の摩側主点から摩面までの距離をｆ、 とする
と、全系の合成焦点距１１１１１ｆは
またＩ２ は
で与えられる。That is, the zoom lens is composed of three lens groups, and the focal length of the first lens group is fl, the focal length of the second lens group is f2, and the focal length of the third lens group is f. Assuming that the distance between the king points of the second lens group is t4, the principal point distance between the second and third lens groups is t2, and the distance from the principal point on the front side of the third lens group to the front surface is f. , the composite focal length 11111f of the entire system is also given by I2.
変ｆｉＦＶ１２つの正レンズ群の間隔を変化さぜること
によりて行なわれ、このズームレンズ系の変倍比をＭと
すると
Ｍミｆ１＋ｈ
２
でほぼ近似できる。This is done by changing the distance between the two positive lens groups.If the variable magnification ratio of this zoom lens system is M, it can be approximately approximated by Mmif1+h2.
すなわち、第２レンズ群の焦点距離ｆ２を小さくするｌ
ｉ五陪比を大きくすることが可能になる・しかし、本発
明の実施例のように、広角端のｍ角ｂｓｓｒ＊ｒｃ及ｒ
ｉ、ｆ倍比ｔｌ、５ｆｉ１ｍ変、！６うとすれば、第２
レンズ群の焦点距離ｆ２をかなり小さくとらざるを得な
くなる。したがって、第２レンズ群の移動による収差の
変動、特に望遠側での津面湾曲のアンダー化が顕著とな
る。That is, l decreases the focal length f2 of the second lens group.
However, as in the embodiment of the present invention, the m-angle bssr*rc and r
i, f multiplication ratio tl, 5fi1m change,! 6 If you try, the second
The focal length f2 of the lens group must be made quite small. Therefore, fluctuations in aberrations due to movement of the second lens group, especially under-curvature of the tsunami surface on the telephoto side, become noticeable.
これを補正する丸めに、第２レンズ群とほぼ同ＩＩの焦
点距離を持つ負の第３レンズ群を（１１面近傍に固定配
置した。To correct this, a negative third lens group having approximately the same focal length as the second lens group was fixedly arranged near the 11th surface.
上記のように、本発明のズームレンズは、物体側から順
に正の焦点距離を有する第ルンズ群、同じく正の焦点距
離を有する第２レンズ群、及び負の焦点距離を有する第
３レンズ群の３群によって構成され、第ルンズ詳は変倍
による焦点移動の補正のために光軸方向に移動し、第２
レンズ群は変倍のために光軸方向に移動する一方、第３
レンズ詳は津面近傍に固定されている。As described above, the zoom lens of the present invention includes, in order from the object side, a lens group having a positive focal length, a second lens group also having a positive focal length, and a third lens group having a negative focal length. Consisting of three groups, the first lens moves in the optical axis direction to compensate for focal shift due to zooming, and the second
While the lens group moves in the optical axis direction for zooming, the third
The lens details are fixed near the surface.
そして％次の条件を満すことが望ましい。It is desirable that the following conditions be satisfied.
３ ’ ２ （ｆ ｓ （ｓ ｆ ２ ・・
・ （１）Ｔｆｌ＜ｆ２＜３ｆ２ ・・・ Ｉ
２】ｕ ＜ｆＢ＜丁ｆ１ ・・・ （３
）条件（１）は、負の第３レンズ群の持つ前記の濠面湾
曲の補正効果を得るための条件で、上限を越えると縁面
が補正過剰となり、下限を越えると津面の補正作用が不
足する。3' 2 (f s (s f 2 . . .
・ (1) Tfl<f2<3f2...I
2] u < fB < Ding f1 ... (3
) Condition (1) is a condition for obtaining the above-mentioned effect of correcting the moat surface curvature of the negative third lens group.If the upper limit is exceeded, the edge surface will be overcorrected, and if the lower limit is exceeded, the correction effect of the edge surface will be affected. is in short supply.
条件り）は変＠（よる収差変動を抑えるための条件であ
る◎変倍は第ルンズ群と第２レンズ群を移動させること
によって行なうが、収差補正は第ルンズ群が主に分担し
ており、第ルンズ詳（比べ第２レンズ詳の焦点距離が短
くなりすぎると、変倍による収差変動が補正し切れなく
なる。条ｆ！＋１２）の上限を越えるとす１０式から明
らかなように充分な変倍比を得ることが困ＩＩ＆になる
。また下限を越えると＃！２レンズ群の発生する収篭を
第ルンズ群で補正することが困雌（なる。The condition) is a condition for suppressing aberration fluctuations caused by the change. ◎Magnification change is performed by moving the lens group and the second lens group, but aberration correction is mainly done by the lens group. , if the upper limit of the second lens detail (compared to the focal length of the second lens detail becomes too short, it becomes impossible to correct the aberration fluctuation due to zooming. article f! + 12), it is clear from equation 10 that the lens becomes insufficient. It becomes difficult to obtain a variable magnification ratio. Also, if the lower limit is exceeded, it becomes difficult to correct the convergence generated by the #!2 lens group with the second lens group.
条件町３）は第３レンズ群の位置に関する条件であり、
パックフォーカスｆＢ が零より大きいことは、実１
象をフィルム面上に作るための必要条件である。上限を
越えると、第２レンズ詳が変倍のために移動できる範囲
が制限され、充分な変倍比をとることが困難となる。Condition 3) is a condition regarding the position of the third lens group,
It is true that the pack focus fB is larger than zero.
This is a necessary condition for creating an image on the film surface. If the upper limit is exceeded, the range in which the second lens can move for zooming is limited, making it difficult to obtain a sufficient zoom ratio.
以下、本発明のズームレンズの実ｍガを示す。The actual zoom lens of the present invention will be shown below.
レンズ各群の移動色部を第１図に、実施例１のレンズ断
面を第２図に、実施例２のレンズ断面を第３図に示す。The moving color portion of each lens group is shown in FIG. 1, the lens cross section of Example 1 is shown in FIG. 2, and the lens cross section of Example 2 is shown in FIG. 3.
第４図１．第５図はそれぞれの □実施例の収差図
である。Figure 41. FIG. 5 is an aberration diagram of each □ Example.
実施例１
焦点距離 ｆ＝４０．３〜５８．８ Ｆナンバー
４０画 角 ２Ｗ＝５７．４〜３９．３１Ｊ
ｊｆ１冨５８．７６９ 、 ｆ２＝７８．２７２ 、
ｆ３＝−５４，１７６１Ｂツ２，０
実施例２
焦点距離 ｆ＝４０．６〜５８．５ Ｆナンバー４
．０画 角 ２Ｗ＝５７．４〜３９．２！ｌ
ｊｔ、−６８７１５ 、 ｔ２−７９２１１ 、
ｆ３−−４８１６３ｆＢｘｇ、０Example 1 Focal length f=40.3~58.8 F number 40 Angle of view 2W=57.4~39.31J
jf1 58.769, f2=78.272,
f3=-54,1761B2,0 Example 2 Focal length f=40.6-58.5 F number 4
．． 0 angle of view 2W=57.4~39.2! l
jt, -68715, t2-79211,
f3--48163fBxg, 0
第１図は本発明のズームレンズの各レンズ群の移動径路
図、第２ｒＡ、第３図はそれぞれ実施例１、実施例２の
レンズ断面図、第４図、第６図はそれぞれの実施例の収
差曲線図である。
特詐出願人 小西六写真工業床式脅社出願人代理人
升理士 佐 旙 文 男０１か１名）
第１図
第２図
第 ３ 図
第４図
球面収差 非点収差
Ｋ・曲数、工
第 ５ 図
歪曲・ｌｙ ７
２ ２ （劉FIG. 1 is a movement path diagram of each lens group of the zoom lens of the present invention, FIGS. 2rA and 3 are cross-sectional views of lenses of Example 1 and Example 2, respectively, and FIGS. 4 and 6 are respective examples. It is an aberration curve diagram of. Special fraud applicant: Roku Konishi Photo Industry Floor Type Intimidation Company Applicant's agent: Masu Physician, Mr. Satoshi Sa, 01 or 1 person) Fig. 1 Fig. 2 Fig. 3 Fig. 4 Spherical aberration Astigmatism K/Number of curves, Figure 5 Distortion・ly 7 2 2 (Liu
Claims (1)
じく正の焦点距離を有する第２レンズ群及び亀の焦点距
離を有する第３レンズ群の３Ｆ＃によって構成させ、第
ルンズ群は変倍による焦点移動の補正のために光軸方向
に移動し、第２レンズ群は変倍のため（光軸方向に移動
する一方、第３レンズ群は画面近傍に固定されているこ
とを特徴とする小型ズームレンズ[Claims] One ridge from the object side [consisting of 3F# of the first lens group having a positive focal length, the second lens group also having a positive focal length, and the third lens group having a tortoise focal length. , the second lens group moves in the optical axis direction to compensate for focal shift due to zooming, the second lens group moves in the optical axis direction for zooming, and the third lens group is fixed near the screen. A compact zoom lens characterized by
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57018901A JPS58137813A (en) | 1982-02-10 | 1982-02-10 | Small-sized zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57018901A JPS58137813A (en) | 1982-02-10 | 1982-02-10 | Small-sized zoom lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58137813A true JPS58137813A (en) | 1983-08-16 |
| JPH0358088B2 JPH0358088B2 (en) | 1991-09-04 |
Family
ID=11984481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57018901A Granted JPS58137813A (en) | 1982-02-10 | 1982-02-10 | Small-sized zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58137813A (en) |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4701033A (en) * | 1983-09-09 | 1987-10-20 | Minolta Camera Kabushiki Kaisha | Variable focal length lens system |
| US4773744A (en) * | 1986-12-18 | 1988-09-27 | Olympus Optical Co., Ltd. | Compact zoom lens system with a high zooming ratio |
| US4822152A (en) * | 1986-08-11 | 1989-04-18 | Olympus Optical Co., Ltd. | Compact high-vari-focal ratio zoom lens system |
| US4840467A (en) * | 1986-12-25 | 1989-06-20 | Olympus Optical Co., Ltd. | Compact zoom lens system with a high zooming ratio |
| US4854682A (en) * | 1987-11-13 | 1989-08-08 | Olympus Optical Co., Ltd. | Compact high vari-focal ratio zoom lens system |
| US5002373A (en) * | 1988-02-10 | 1991-03-26 | Olympus Optical Co., Ltd. | Zoom lens system of inner focus type |
| JPH03501416A (en) * | 1988-05-27 | 1991-03-28 | イーストマン・コダック・カンパニー | Compact wide-angle close-focus SLR camera zoom lens |
| JPH05264903A (en) * | 1991-03-04 | 1993-10-15 | Olympus Optical Co Ltd | Wide-angle zoom lens |
| US5283693A (en) * | 1990-06-13 | 1994-02-01 | Minolta Camera Kabushiki Kaisha | Compact zoom lens system |
| US5327290A (en) * | 1989-10-13 | 1994-07-05 | Minolta Camera Kabushiki Kaisha | Compact size zoom lens system |
| US5424870A (en) * | 1990-07-20 | 1995-06-13 | Minolta Camera Kabushiki Kaisha | Compact zoom lens system |
| JP2014038230A (en) * | 2012-08-17 | 2014-02-27 | Optical Logic Inc | Imaging lens |
| JP2015141306A (en) * | 2014-01-28 | 2015-08-03 | 株式会社リコー | Image-reading lens, image reading apparatus, and image forming apparatus |
| US10310236B2 (en) | 2014-08-01 | 2019-06-04 | Largan Precision Co., Ltd. | Photographing optical lens assembly, image capturing unit and electronic device |
| JP2020181071A (en) * | 2019-04-25 | 2020-11-05 | キヤノン株式会社 | Optical system and image capturing device having the same |
| JP2022017155A (en) * | 2020-07-13 | 2022-01-25 | エーエーシー オプティクス （チャンジョウ）カンパニーリミテッド | Image capturing optical lens |
-
1982
- 1982-02-10 JP JP57018901A patent/JPS58137813A/en active Granted
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4701033A (en) * | 1983-09-09 | 1987-10-20 | Minolta Camera Kabushiki Kaisha | Variable focal length lens system |
| US4822152A (en) * | 1986-08-11 | 1989-04-18 | Olympus Optical Co., Ltd. | Compact high-vari-focal ratio zoom lens system |
| US4773744A (en) * | 1986-12-18 | 1988-09-27 | Olympus Optical Co., Ltd. | Compact zoom lens system with a high zooming ratio |
| US4840467A (en) * | 1986-12-25 | 1989-06-20 | Olympus Optical Co., Ltd. | Compact zoom lens system with a high zooming ratio |
| US4854682A (en) * | 1987-11-13 | 1989-08-08 | Olympus Optical Co., Ltd. | Compact high vari-focal ratio zoom lens system |
| US5002373A (en) * | 1988-02-10 | 1991-03-26 | Olympus Optical Co., Ltd. | Zoom lens system of inner focus type |
| JPH03501416A (en) * | 1988-05-27 | 1991-03-28 | イーストマン・コダック・カンパニー | Compact wide-angle close-focus SLR camera zoom lens |
| US5327290A (en) * | 1989-10-13 | 1994-07-05 | Minolta Camera Kabushiki Kaisha | Compact size zoom lens system |
| US5283693A (en) * | 1990-06-13 | 1994-02-01 | Minolta Camera Kabushiki Kaisha | Compact zoom lens system |
| US5424870A (en) * | 1990-07-20 | 1995-06-13 | Minolta Camera Kabushiki Kaisha | Compact zoom lens system |
| JPH05264903A (en) * | 1991-03-04 | 1993-10-15 | Olympus Optical Co Ltd | Wide-angle zoom lens |
| JP2014038230A (en) * | 2012-08-17 | 2014-02-27 | Optical Logic Inc | Imaging lens |
| JP2015141306A (en) * | 2014-01-28 | 2015-08-03 | 株式会社リコー | Image-reading lens, image reading apparatus, and image forming apparatus |
| US10310236B2 (en) | 2014-08-01 | 2019-06-04 | Largan Precision Co., Ltd. | Photographing optical lens assembly, image capturing unit and electronic device |
| US11940605B2 (en) | 2014-08-01 | 2024-03-26 | Largan Precision Co., Ltd. | Photographing optical lens assembly, image capturing unit and electronic device |
| JP2020181071A (en) * | 2019-04-25 | 2020-11-05 | キヤノン株式会社 | Optical system and image capturing device having the same |
| JP2022017155A (en) * | 2020-07-13 | 2022-01-25 | エーエーシー オプティクス （チャンジョウ）カンパニーリミテッド | Image capturing optical lens |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0358088B2 (en) | 1991-09-04 |
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