JPH028282B2 - - Google Patents
Info
- Publication number
- JPH028282B2 JPH028282B2 JP56054672A JP5467281A JPH028282B2 JP H028282 B2 JPH028282 B2 JP H028282B2 JP 56054672 A JP56054672 A JP 56054672A JP 5467281 A JP5467281 A JP 5467281A JP H028282 B2 JPH028282 B2 JP H028282B2
- Authority
- JP
- Japan
- Prior art keywords
- group
- lens
- focal length
- groups
- refractive power
- 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
- 230000004075 alteration Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 201000009310 astigmatism Diseases 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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
- G02B15/143105—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
本発明は、スチルカメラ用の広角域を含む、高
変倍率のズームレンズ系に関する。
従来より広角域を含むズームレンズとしては、
負・正の２群で構成される、所謂２成分ズーム型
が提供されてきた。しかしながら、F3.5クラスの
大口径で、長焦点距離側（テレ端）の焦点距離が
85mmを越える場合は、特に間隔誤差による球面収
差の変動量が極めて大となり、実用に供し得なか
つた。一方、フオーカス部、バリエーター、コン
ペンセーター、リレー部で構成される所謂４成分
ズーム型では、広角域を含む高変倍率にすると、
コンパクト化をはかり、かつ、第１群（フオカス
部で）フオーカシング可能にするには、短焦点距
離側（ワイド端）の焦点距離が40mm以下だと、フ
オーカス部、バリエーター部の焦点距離が極めて
短かくなり、諸収差の補正が困難であつた。本発
明は、35mm判を想定した場合、可変焦点距離範囲
が35−105mmに対応するズーム比３程度で、しか
もF3.5クラスの大口経ズームレンズをコンパクト
な形で提供することを目的としたものである。
本発明の特徴は、物体側より順に、正屈折力の
第１群、負屈折力の第２群及び正屈折力の第３群
を有し、この第３群を正屈折力の前群及び正屈折
力の後群の２群に分けるとともに、少くとも前記
第１群及び第３群の前群、後群をそれぞれ移動さ
せ、前記第１、第２群間、前記第２、第３群間及
び前記第３群の前群、後群間の空気間隔をそれぞ
れ変化させることによりズーミングを行い、か
つ、前記第２群が物体側から順に、像側より強い
曲率を有する第１負レンズL1、像側により強い
曲率を有する第２負レンズL2、物体側により強
い曲率を有する第３正レンズL3、及び物体側に
より強い曲率を有する第４負レンズL4を有し、
更に以下の条件を満足することを特徴とする広角
域を含む高変倍率ズームレンズ系にある。
0.4＜fW／f〓＜0.6
0.1＜fT／（fW・｜f〓｜）＜0.2
但し、ここで、
fW：最広角端における全系の焦点距離；
fT：最望遠端における全系の焦点距離；
f〓：第１群の焦点距離；
f〓：第２群の焦点距離。
以上の様に、本発明ではズーム系を基本的に
正・負・正の３群で構成し、ズーミングに際し
て、少くとも第１群及び第３群の前群、後群をそ
れぞれ光軸に沿つて移動させることによつて、変
倍効果を分担させており、各群の可動範囲が小さ
く、コンパクトな高変倍率ズームレンズ系が可能
となつた。
さらに上記条件式(1)は、第１群（）の屈折力
を規定する条件で、その上限を越えると、特に最
望遠端での歪曲が大きくなり、一方、その下限を
越えると、第１群でフオーカシングする場合、実
用上の最近接撮影距離が確保できなくなる。
次に条件式(2)は、第２群（）の屈折力を規定
する条件で、その上限を越えると、特に最望遠端
での球面収差の補正が困難となり、その下限を越
えると、本発明の目的とするズームレンズ系のコ
ンパクト化が実現できなくなる。
さらに、条件式(2)の範囲において、ズーミング
中の諸収差の変動、特に球面収差の変動を極力抑
えるために、第２群が、上記に示したごとき４つ
のレンズで構成されるのが望ましい。
また、本発明において、第３群をそれぞれ正屈
折力の前群（−１）と後群（−２）に分割
し、その間の光束がほぼ平行になつている空気間
隔をズーミング中に変化させることは、所謂、レ
トロフオーカスタイプ・広角レンズの近接撮影に
おけるフローテイング効果と同様に、ズーミング
中の非点収差の変動を小さくする効果をもつ。
以下具体的に本発明の実施例について述べる。
The present invention relates to a zoom lens system with a high variable magnification including a wide-angle range for still cameras. As a conventional zoom lens that includes a wide-angle range,
A so-called two-component zoom type camera, which is composed of two negative and positive groups, has been provided. However, with a large aperture of F3.5 class, the focal length on the long focal length side (tele edge) is
If it exceeds 85 mm, the amount of variation in spherical aberration due to spacing error becomes extremely large, making it impossible to put it to practical use. On the other hand, in the so-called four-component zoom type, which consists of a focus section, variator, compensator, and relay section, when a high magnification including a wide-angle range is used,
In order to achieve compactness and enable focusing in the first group (at the focus section), if the focal length on the short focal length side (wide end) is 40 mm or less, the focal length at the focus section and variator section must be extremely short. As a result, it was difficult to correct various aberrations. The present invention aims to provide a compact F3.5 class large aperture zoom lens with a zoom ratio of about 3, which corresponds to a variable focal length range of 35-105mm, assuming a 35mm format. It is something. The present invention is characterized by having, in order from the object side, a first group with positive refractive power, a second group with negative refractive power, and a third group with positive refractive power, and this third group is connected to a front group with positive refractive power and a third group with positive refractive power. It is divided into two groups, a rear group with positive refractive power, and at least the front and rear groups of the first and third groups are moved, respectively, and between the first and second groups, and between the second and third groups. A first negative lens L that performs zooming by changing the air distance between the front group and the rear group of the third group, respectively, and in which the second group has a stronger curvature than the image side in order from the object side. 1 , a second negative lens L 2 having a stronger curvature on the image side, a third positive lens L 3 having a stronger curvature on the object side, and a fourth negative lens L 4 having a stronger curvature on the object side,
Furthermore, the present invention provides a high-power zoom lens system including a wide-angle range, which satisfies the following conditions. 0.4＜f W /f〓＜0.6 0.1＜f T /(f W・｜f〓｜)＜0.2 However, where, f W : Focal length of the entire system at the widest angle end; f T : At the maximum telephoto end Focal length of the entire system; f〓: Focal length of the first group; f〓: Focal length of the second group. As described above, in the present invention, the zoom system basically consists of three groups, positive, negative, and positive, and during zooming, at least the front and rear groups of the first and third groups are moved along the optical axis. By moving the lens, the variable magnification effect is shared, and the movable range of each group is small, making it possible to create a compact, high variable magnification zoom lens system. Furthermore, the above conditional expression (1) is a condition that defines the refractive power of the first lens group (2), and when the upper limit is exceeded, the distortion becomes large, especially at the maximum telephoto end.On the other hand, when the lower limit is exceeded, the first lens group When focusing in groups, it becomes impossible to ensure a practical closest shooting distance. Next, conditional expression (2) is a condition that defines the refractive power of the second group (2).If the upper limit is exceeded, it becomes difficult to correct spherical aberration, especially at the maximum telephoto end, and if the lower limit is exceeded, the This makes it impossible to make the zoom lens system compact, which is the objective of the invention. Furthermore, within the range of conditional expression (2), in order to suppress fluctuations in various aberrations during zooming, especially fluctuations in spherical aberration, it is desirable that the second group be composed of four lenses as shown above. . In addition, in the present invention, the third group is divided into a front group (-1) and a rear group (-2) each having a positive refractive power, and the air gap between which the light beams are almost parallel is changed during zooming. This has the effect of reducing fluctuations in astigmatism during zooming, similar to the floating effect in close-up photography with a so-called retrofocus type wide-angle lens. Examples of the present invention will be specifically described below.
【表】【table】
【表】【table】
【表】【table】
【表】【table】
【表】【table】
【表】
第１図は、上記実施例１の最短焦点距離（Ｓ）
でのレンズ構成を示す。又その下方の直線又は曲
線は、ズーミングにおける各レンズ群の移動形式
を示したものである。第２図は、上記実施例１に
おいて、物体距離無限遠における、最長焦点距離
Ｌ、中間焦点距離（Ｍ）、最短焦点距離（Ｓ）で
の各収差図を示す。
第３図は、上記実施例２の最短焦点距離（Ｓ）
におけるレンズ構成を示す。又その下方の直線又
は曲線は、ズーミングにおけるレンズ群の移動形
式を示したものである。第４図は、物体距離無限
遠における、最長焦点距離(L)、中間焦点距離
（Ｍ）、最短焦点距離（Ｓ）での各収差図を示す。
本実施例においては、第２群の最も像側に近いレ
ンズL4を接合レンズにすることによつて、特に
(L)から（Ｍ）にかけての像面性と倍率色収差を小
さく抑えている。
第５図は、上記実施例３の最短焦点距離（Ｓ）
でのレンズ構成を示す。又その下方の直線又は曲
線は、ズーミングにおけるレンズ群の移動形式を
示したものである。第６図は、物体距離無限遠に
おける、最長焦点距離(L)、中間焦点距離（Ｍ）、
最短焦点距離（Ｓ）での各収差図を示す。本実施
例は、実施例２との同様の構成であるが、ズーミ
ング中に第２群を固定にした場合の実施例で、こ
のように第２群が固定であつても本発明の意図か
ら何んら逸脱するものではない。
以上の如く、本発明の実施の態様においては、
レンズ系の第１群（）は１枚の負レンズエレメ
ントと２枚の正レンズエレメントより構成されて
いる。また、第３群は共に正屈折力の前群（−
１）と後群（−２）に分割され、その前群（
１）は２枚の正レンズで構成され、少なくとも一
方は正・負エレメントを接合してなる接合レンズ
となつている。一方、後群（−２）は物体側よ
り順に正レンズ、両凹レンズ、及び２枚の正レン
ズより構成されている。
以上から明らかなように、本発明においては、
広角域を含む高変倍率ズームレンズにもかかわら
ず、コンパクトでかつ高性能なレンズ系が提供で
きた。特に実施例２、実施例３においては、55φ
フイルターが可能である。[Table] Figure 1 shows the shortest focal length (S) of Example 1 above.
This shows the lens configuration. Further, the straight line or curved line below indicates the movement type of each lens group during zooming. FIG. 2 shows aberration diagrams at the longest focal length L, intermediate focal length (M), and shortest focal length (S) at an infinite object distance in the first embodiment. Figure 3 shows the shortest focal length (S) of Example 2 above.
The lens configuration shown in FIG. Further, the straight line or curved line below indicates the movement type of the lens group during zooming. FIG. 4 shows aberration diagrams at the longest focal length (L), intermediate focal length (M), and shortest focal length (S) at an infinite object distance.
In this example, by making the lens L4 closest to the image side of the second group a cemented lens,
Image quality and chromatic aberration of magnification from (L) to (M) are kept small. FIG. 5 shows the shortest focal length (S) of Example 3 above.
This shows the lens configuration. Further, the straight line or curved line below indicates the movement type of the lens group during zooming. Figure 6 shows the longest focal length (L), intermediate focal length (M), and
Each aberration diagram at the shortest focal length (S) is shown. This example has the same configuration as Example 2, but is an example in which the second group is fixed during zooming. This is not a deviation in any way. As described above, in the embodiments of the present invention,
The first group ( ) of the lens system is composed of one negative lens element and two positive lens elements. In addition, both the third group and the front group (−
1) and the rear group (-2), and the front group (
1) is composed of two positive lenses, at least one of which is a cemented lens formed by cementing positive and negative elements. On the other hand, the rear group (-2) is composed of, in order from the object side, a positive lens, a biconcave lens, and two positive lenses. As is clear from the above, in the present invention,
Despite being a zoom lens with a high zoom ratio that includes a wide-angle range, we were able to provide a compact and high-performance lens system. Especially in Example 2 and Example 3, 55φ
Filters are possible.
第１図は、本発明の第１実施例のレンズ構成及
びレンズ移動形式を示す断面図、第２図は、その
収差図、第３図は、本発明の第２実施例のレンズ
構成及びレンズ移動形式を示す断面図、第４図
は、その収差図、第５図は、本発明の第３実施例
のレンズ構成及びレンズ移動形式を示す断面図、
第６図は、その収差図である。
……第１群、……第２群、……第３群、
−１……第３群前群、−２……第３群後群。
FIG. 1 is a sectional view showing the lens configuration and lens movement type of the first embodiment of the present invention, FIG. 2 is an aberration diagram thereof, and FIG. 3 is a lens configuration and lens movement type of the second embodiment of the present invention. 4 is an aberration diagram thereof; FIG. 5 is a sectional view showing the lens configuration and lens movement type of a third embodiment of the present invention;
FIG. 6 is an aberration diagram. ...First group, ...Second group, ...Third group,
-1...3rd group front group, -2...3rd group rear group.
Claims (1)
力の第２群及び正屈折力の第３群を有し、この第
３群を正屈折力の前群及び正屈折力の後群の２群
に分けるとともに、少くとも前記第１群及び前記
第３群の前群、後群をそれぞれ移動させ、前記第
１、第２群間、前記第２、第３群間及び前記第３
群の前群、後群間の空気間隔をそれぞれ変化させ
ることによりズーミングを行い、かつ、前記第２
群が物体側から順に、像側より強い曲率を有する
第１負レンズL1、像側により強い曲率を有する
第２負レンズL2、物体側により強い曲率を有す
る第３正レンズL3、及び物体側により強い曲率
を有する第４負レンズL4を有し、更に以下の条
件を満足することを特徴とする広角域を含む高変
倍率ズームレンズ系： 0.4＜fW／f〓＜0.6 0.1＜fT／（fW・｜f〓｜）＜0.2 但し、ここで、 fW：最広角端における全系の焦点距離、 fT：最望遠端における全系の焦点距離、 f〓：第１群の焦点距離、 f〓：第２群の焦点距離、 である。 ２ 前記第２群の第４負レンズL4が接合レンズ
あることを特徴とする特許請求の範囲第１項記載
のズームレンズ系。[Claims] 1. In order from the object side, it has a first group with positive refractive power, a second group with negative refractive power, and a third group with positive refractive power, and this third group is a front group with positive refractive power. and a rear group with positive refractive power, and at least the front and rear groups of the first group and the third group are moved respectively, and between the first and second groups, between the second and second groups. Between the three groups and the third
Zooming is performed by changing the air spacing between the front group and the rear group, and the second
The groups, in order from the object side, include a first negative lens L 1 having a stronger curvature than the image side, a second negative lens L 2 having a stronger curvature on the image side, a third positive lens L 3 having a stronger curvature on the object side, and A high variable magnification zoom lens system including a wide-angle range, which has a fourth negative lens L4 having a stronger curvature on the object side and further satisfies the following conditions: 0.4<f W /f〓<0.6 0.1 <f T / (f W · | f〓 |) <0.2 However, where, f W : Focal length of the entire system at the widest angle end, f T : Focal length of the entire system at the most telephoto end, f〓: The focal length of the entire system at the maximum telephoto end. Focal length of the first group, f〓: Focal length of the second group. 2. The zoom lens system according to claim 1, wherein the fourth negative lens L4 of the second group is a cemented lens.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56054672A JPS57169716A (en) | 1981-04-10 | 1981-04-10 | Zoom lens system of high variable magnification including wide angle region |
| US06/366,673 US4494828A (en) | 1981-04-09 | 1982-04-08 | Zoom lens system of relatively high zoom ratio ranging to wide angle photography |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56054672A JPS57169716A (en) | 1981-04-10 | 1981-04-10 | Zoom lens system of high variable magnification including wide angle region |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57169716A JPS57169716A (en) | 1982-10-19 |
| JPH028282B2 true JPH028282B2 (en) | 1990-02-23 |
Family
ID=12977266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56054672A Granted JPS57169716A (en) | 1981-04-09 | 1981-04-10 | Zoom lens system of high variable magnification including wide angle region |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57169716A (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58116509A (en) * | 1981-12-29 | 1983-07-11 | Canon Inc | Zoom lens |
| JPS6014213A (en) * | 1983-07-06 | 1985-01-24 | Nippon Kogaku Kk <Nikon> | Zoom lens of high variable power including wide view angle |
| JPH073506B2 (en) * | 1985-08-17 | 1995-01-18 | キヤノン株式会社 | Zoom lenses |
| US4917482A (en) * | 1987-12-29 | 1990-04-17 | Asahi Kogaku Kogyo Kabushiki Kaisha | Compact zoom lens system capable of high zoom ratio and having coverage of a wide visual field |
| JPH0894933A (en) * | 1994-09-26 | 1996-04-12 | Nikon Corp | High magnifying power zoom lens |
| US5737129A (en) * | 1994-12-26 | 1998-04-07 | Nikon Corporation | Wide-angle zoom lens |
| JPH08220424A (en) * | 1995-02-10 | 1996-08-30 | Nikon Corp | Gauss type lens having vibration proof function |
| JPH08234106A (en) * | 1995-02-23 | 1996-09-13 | Nikon Corp | Zoom lens |
| JPH08248305A (en) * | 1995-03-10 | 1996-09-27 | Nikon Corp | Long focus microlens |
| JPH08278445A (en) * | 1995-04-04 | 1996-10-22 | Nikon Corp | Zoom lens having vibration-isolating function |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52146620A (en) * | 1976-06-01 | 1977-12-06 | Canon Inc | Gauss type lens |
| JPS53134425A (en) * | 1977-04-28 | 1978-11-24 | Nippon Chemical Ind | Large aperture ratio telescopic lens |
| JPS55111915A (en) * | 1979-02-22 | 1980-08-29 | Canon Inc | Zoom lens |
| US4256381A (en) * | 1980-01-31 | 1981-03-17 | Vivitar Corporation | Zoom lens |
| JPS57168209A (en) * | 1981-04-09 | 1982-10-16 | Minolta Camera Co Ltd | Zoom lens system |
-
1981
- 1981-04-10 JP JP56054672A patent/JPS57169716A/en active Granted
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52146620A (en) * | 1976-06-01 | 1977-12-06 | Canon Inc | Gauss type lens |
| JPS53134425A (en) * | 1977-04-28 | 1978-11-24 | Nippon Chemical Ind | Large aperture ratio telescopic lens |
| JPS55111915A (en) * | 1979-02-22 | 1980-08-29 | Canon Inc | Zoom lens |
| US4256381A (en) * | 1980-01-31 | 1981-03-17 | Vivitar Corporation | Zoom lens |
| JPS57168209A (en) * | 1981-04-09 | 1982-10-16 | Minolta Camera Co Ltd | Zoom lens system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57169716A (en) | 1982-10-19 |
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| US5054899A (en) | Medium telephoto lens system | |
| JPH0514247B2 (en) | ||
| JPH0545001B2 (en) | ||
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