JP6409361B2 - Inner focusing type zoom lens - Google Patents
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本発明は、テレビカメラ、映画用カメラ、スチルカメラ、ビデオカメラ等の撮像装置に用いる撮影レンズに好適な光学系に関し、小型軽量、かつフォーカシングによる収差変動が少ないズームレンズに関するものである。 The present invention relates to an optical system suitable for a photographic lens used in an imaging apparatus such as a television camera, a movie camera, a still camera, and a video camera, and more particularly to a zoom lens that is small and light and has little aberration fluctuation due to focusing.
従来の４群ズームレンズにおいては、焦点調節時に第１レンズ群全体を移動する前玉フォーカス方式がよく知られているが、全体として正のパワーを有する第１レンズ群全体を移動して近距離物体に合焦しようとすると、第１レンズ群は物体側へ繰り出されることから、画面周辺の光束を確保するために、第１レンズ群の有効径はどうしても大きくなる。これは、広画角になるほど顕著となる。第１レンズ群の有効径が大きくなるとレンズ重量が増大するため、携帯用のテレビカメラに搭載するズームレンズとしては不都合であった。 In a conventional four-group zoom lens, a front lens focus system that moves the entire first lens group during focus adjustment is well known, but the entire first lens group having positive power as a whole is moved to a short distance. When trying to focus on the object, the first lens group is drawn out to the object side, so that the effective diameter of the first lens group inevitably increases in order to secure the light flux around the screen. This becomes more conspicuous as the angle of view becomes wider. When the effective diameter of the first lens group increases, the lens weight increases, which is inconvenient for a zoom lens mounted on a portable television camera.
この問題を解決するために、前記第１レンズ群を、３つのレンズ群に分割し、それらの内、像側に位置する２つのレンズ群を各々異なる速度で移動させることにより、物体距離無限遠から近距離物体まで収差変動を少なく合焦させる方法が提案されており特許文献１、２、３が開示されている。
In order to solve this problem, the first lens group is divided into three lens groups, and two lens groups located on the image side among them are moved at different speeds, so that the object distance is increased from infinity. Methods have been proposed for focusing on near-distance objects with little aberration fluctuation, and
特許文献１では、第１レンズ群が負のパワーの第Ａ群、正のパワーの第Ｂ１群、そして正のパワーの第Ｂ２群の３つのレンズ群を有し、無限遠物体から近距離物体へのフォーカスの際に該第Ｂ１群と第Ｂ２群とを異なる移動量で物体側へ移動させて行うフローティングを用いたインナーフォーカス方式を採用し、可動部の重量を軽量化しつつ良好なる光学性能を得ている。
In
また、特許文献２では、第１レンズ群が固定の負のパワーの第１ａレンズ群、正のパワーの第１ｂレンズ群、正のパワーの第１ｃ群から構成し、焦点調節時において互いに異なる方向に移動する、いわゆるフローティング方式を採用して、物体距離の変動による収差の変動を大幅に減少させるようにしている。 Also, in Patent Document 2, the first lens group is composed of a fixed negative power 1a lens group, a positive power 1b lens group, and a positive power 1c group, and different directions during focus adjustment. A so-called floating method is adopted to move the lens to a position where the aberration variation due to the object distance variation is greatly reduced.
また、特許文献３では、第１レンズ群が固定の正のパワーの第１１レンズ群、負のパワーの第１２レンズ群、正のパワーの第１３群からなり、該１３レンズ群は正のパワーを有する第１３ｆレンズ群を含み第１２レンズ群と第１３ｆレンズ群をそれぞれ物体側へ繰り出すことにより、フォーカスによる収差変動が少なく、さらにブリージング（画角変動）の少ないズームレンズを達成している。 In Patent Document 3, the first lens group includes an eleventh lens group having a fixed positive power, a twelfth lens group having a negative power, and a thirteenth group having a positive power. The 13 lens group has a positive power. By extending the twelfth lens group and the thirteenth lens group to the object side including the 13f lens group having a zoom lens, a zoom lens with less aberration fluctuation due to focus and less breathing (field angle fluctuation) is achieved.
テレビカメラ、映画用カメラ等に用いるズームレンズにおいては、機動性の確保と撮影自由度の向上のために、更なる高倍率と小型軽量化、および全ズーム領域、全フォーカス領域で、高い光学性能が求められている。更に映画撮影やＣＭ撮影に用いられるレンズにおいてはフォーカスによる被写体の大きさの変化（以下、ブリージングと呼ぶ）を抑制することが望まれている。
ここでブリージングの度合いをＢとし、Ｂを以下の式で定義する。
Ｂ（％）＝（ｆｍｏｄ−ｆｉｎｆ）／ｆｉｎｆ×１００
ｆｍｏｄ：任意の焦点距離の至近時におけるズームレンズ全系の焦点距離
ｆｉｎｆ：任意の焦点距離の無限遠時におけるズームレンズ全系の焦点距離
ズームレンズにおいて、ブリージングを少なくするためには、各レンズ群の屈折力やレンズ構成、そして収差分担等を適切に設定する必要がある。特に、ズームレンズ全体の小型・軽量化を達成しつつ、ブリージング及び望遠端におけるフォーカス時の収差変動を同時に抑制するためには、第１群内のフォーカス移動群の設定と屈折力配置、各部分系の構成等を適切に設定することが必要となる。
Zoom lenses used in TV cameras, movie cameras, etc. have higher optical performance in all zoom areas and all focus areas, as well as higher magnification, smaller size, and lighter weight to ensure mobility and improve shooting flexibility. Is required. Further, in lenses used for movie shooting and CM shooting, it is desired to suppress a change in the size of a subject due to focus (hereinafter referred to as breathing).
Here, the degree of breathing is defined as B, and B is defined by the following equation.
B (%) = (fmod−finf) / finf × 100
fmod: the focal length of the entire zoom lens system at an arbitrary focal length in the vicinity finf: the focal length of the entire zoom lens system at an arbitrary focal length at infinity In order to reduce breathing, each lens group It is necessary to appropriately set the refractive power, lens configuration, and aberration sharing. In particular, in order to simultaneously reduce aberrations during breathing and focusing at the telephoto end while achieving reduction in size and weight of the entire zoom lens, setting of the focus moving group in the first group, refractive power arrangement, and each part It is necessary to set the system configuration appropriately.
特許文献１のフォーカス方式ではブリージングを抑制することは困難であり、実施例1の広角端のブリージングの度合Ｂは１９％と非常に大きい。
In the focus method of
特許文献２のフォーカス方式では広角ズームレンズに適しているが、小型軽量化と高倍率化を両立することが困難であり、また望遠端での最至近時の性能低下が大きく、必ずしも物体距離の変動に伴う収差の変動を減少させ得るインナーフォーカシングタイプのズームレンズを開示しているとは言い難い。さらにこのパワー配置でのフォーカス方式ではブリージングを抑制することは困難であり、実施例1の広角端のブリージングの度合Ｂは７％であるものの、望遠端でのブリージングの度合Ｂは４０％と非常に大きい。 Although the focus method of Patent Document 2 is suitable for a wide-angle zoom lens, it is difficult to achieve both a reduction in size and weight and an increase in magnification, and the performance at the telephoto end is greatly reduced. It is difficult to say that an inner focusing type zoom lens that can reduce fluctuations in aberrations due to fluctuations is disclosed. Further, it is difficult to suppress breathing with the focus method with this power arrangement, and although the degree B of breathing at the wide-angle end in Example 1 is 7%, the degree B of breathing at the telephoto end is very low at 40%. Big.
特許文献３は、高倍率と小型軽量の両立が可能であり、かつ焦点調整による収差変動が少なく、更に広角端のブリージングの度合Ｂは−３％程度とブリージングが抑制されたフォーカス方式を有している。しかし先頭レンズ群が正レンズ群であるために広角側への余力に難を有する構成である。 Patent Document 3 has a focus method in which both high magnification and small size and light weight are possible, aberration fluctuation due to focus adjustment is small, and breathing degree B at the wide-angle end is about -3%. ing. However, since the leading lens group is a positive lens group, there is a difficulty in remaining power to the wide angle side.
そこで本発明は、上記課題を解決し、小型軽量であり、フォーカシングによる収差変動が少なく、広角化への余力を残した、更にブリージングの少ないインナーフォーカシングタイプのズームレンズを提供することを目的とする。 SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an inner focusing type zoom lens that solves the above-mentioned problems, is small and light, has little aberration fluctuation due to focusing, has a margin for widening, and has less breathing. .
上記課題を解決するために第１の発明のズームレンズは、物体側から順に正のパワーを有し変倍時固定の第１レンズ群と、第２レンズ群以降は、変倍時に移動する２つのレンズ群から成る変倍レンズ群と、開口絞りと正のパワーを有し変倍時固定のリレーレンズ群とからなり、該第１レンズ群は、物体側より順に負のパワーを有し、単レンズからなる第１１レンズ群と、負のパワーを有する第１２レンズ群と、正のパワーを有する第１３レンズ群とを有し、該１２レンズ群を物体側へ繰り出すことにより近距離物体へフォーカシングを行い、前記第２レンズ群から最終群までの望遠端での合成焦点距離とした時、以下の条件を満足する。
（１） ０．９０＜ｆ１１／ｆ１２＜１４．００
（２） −０．７５＜ｆ１／ｆ１１＜−０．０２
（３） ０．４５＜ｆｒｔ／ｆｔ
ただし、
ｆ１１：第１１レンズ群の焦点距離
ｆ１２：第１２レンズ群の焦点距離
ｆ１ ：第１レンズ群の焦点距離である。
ｆｒｔ：前記第２レンズ群から最終群までの望遠端での合成焦点距離
ｆｔ ：望遠端におけるズームレンズ全系の焦点距離
In order to solve the above-described problem, the zoom lens of the first invention has a first lens group having positive power in order from the object side and fixed at the time of zooming, and the second lens group and thereafter move at the time of zooming. a lens group consisting One lens group consists of a relay lens group during zooming has an aperture stop and a positive power fixed, the first lens group have a negative power in order from the object side, It has a first lens subunit that Do a single lens, a second lens unit having negative optical power, a third lens group having a positive power, short-distance object by moving the lens subunit on the object side When focusing is performed to obtain a composite focal length at the telephoto end from the second lens group to the final group, the following condition is satisfied.
(1) 0. 9 0 <f11 / f12 <14.00
(2) -0.75 <f1 / f11 <-0.02
(3) 0.45 <frt / ft
However,
f11: focal length of the eleventh lens group f12: focal length of the twelfth lens group f1: focal length of the first lens group.
frt: Composite focal length at the telephoto end from the second lens group to the final group
ft: focal length of the entire zoom lens at the telephoto end
本発明によれば、小型軽量であり、フォーカシングによる収差変動が少なく、広角化への余力を残した、更にブリージングの少ないインナーフォーカシングタイプのズームレンズを提供することができる。 According to the present invention, it is possible to provide an inner focusing type zoom lens that is small and light, has little fluctuation in aberration due to focusing, leaves a margin for widening, and has less breathing.
本発明に係るズームレンズは、第1の発明として、図１、図１４、図２７及び図４０に示す本発明の実施例のレンズ構成図からわかるように、物体側から順に正のパワーを有し変倍時固定の第１レンズ群と、変倍時に移動する２つのレンズ群から成る変倍レンズ群と、開口絞りと正のパワーを有し変倍時固定のリレーレンズ群とを有し、該第１レンズ群は、物体側より順に負のパワーを有する第１１レンズ群と、負のパワーを有する第１２レンズ群と、正のパワーを有する第１３レンズ群とを有し、該１２レンズ群を物体側へ繰り出すことにより近距離物体へフォーカシングを行う構成となっており、以下の条件式を満足することを特徴とする。
（１） ０．８０＜ｆ１１／ｆ１２＜１４．００
（２） −０．７５＜ｆ１／ｆ１１＜−０．０２
（３） ０．４５＜ｆｒｔ／ｆｔ
ただし、
ｆ１１：第１１レンズ群の焦点距離
ｆ１２：第１２レンズ群の焦点距離
ｆ１ ：第１レンズ群の焦点距離
ｆｒｔ：第２レンズ群から最終群までの望遠端の焦点距離
ｆｔ ：望遠端におけるズームレンズの全系の焦点距離
The zoom lens according to the present invention, as the first invention, has positive power in order from the object side, as can be seen from the lens configuration diagrams of the embodiments of the present invention shown in FIG. 1, FIG. 14, FIG. 27 and FIG. A first lens group fixed at the time of zooming, a zooming lens group composed of two lens groups that move at the time of zooming, and a relay lens group having an aperture stop and positive power and fixed at the time of zooming The first lens group includes an eleventh lens group having negative power in order from the object side, a twelfth lens group having negative power, and a thirteenth lens group having positive power. The lens group is configured to perform focusing on a short-distance object by extending the lens group toward the object side, and satisfies the following conditional expression.
(1) 0.80 <f11 / f12 <14.00
(2) -0.75 <f1 / f11 <-0.02
(3) 0.45 <frt / ft
However,
f11: Focal length of the eleventh lens group f12: Focal length of the twelfth lens group f1: Focal length of the first lens group frt: Focal length of the telephoto end from the second lens group to the final group ft: Zoom lens at the telephoto end Focal length of the entire system
本発明のズームレンズは、第１１レンズ群を負レンズにすることにより、フォーカス群である第１２レンズ群に入射する光線角を第１１レンズ群に入射する物体側入射角よりも緩和し、これによりフォーカス時の収差変動を減少させることを可能とした。
さらに、第１１レンズ群の負パワーにより、第１２レンズ群の繰り出し量が減少する、あるいは第１２レンズ群の負パワーを減らすことができ、フォーカス時の収差変動を緩和することが可能となる。なお、負パワーの減少と繰り出し量の増加は比例関係にあるため、フォーカス群の小型軽量化とフォーカス時の収差変動を両立させるためには、第１１レンズ群、第１２レンズ群、第１群のパワーを規定する必要がある。また、第１１レンズ群、第１２レンズ群を負のパワーで構成することにより広角化することが有利なパワー配置となる。さらに、第１１レンズ群を負の単レンズで構成することにより第１レンズ群の小型化を図ることができる。
In the zoom lens of the present invention, by making the eleventh lens group a negative lens, the ray angle incident on the twelfth lens group which is the focus group is relaxed more than the object side incident angle incident on the eleventh lens group. This makes it possible to reduce aberration fluctuations during focusing.
Furthermore, the amount of extension of the twelfth lens group can be reduced by the negative power of the eleventh lens group, or the negative power of the twelfth lens group can be reduced, and aberration variations during focusing can be mitigated. Since the decrease in the negative power and the increase in the feed amount are in a proportional relationship, the eleventh lens group, the twelfth lens group, and the first group can be used in order to achieve both a reduction in size and weight of the focus group and an aberration variation during focusing. It is necessary to regulate the power of In addition, it is advantageous to widen the angle by configuring the eleventh lens group and the twelfth lens group with negative power. Furthermore, the first lens group can be downsized by configuring the eleventh lens group with a negative single lens.
条件式（１）は、第１１レンズ群の焦点距離と第１２レンズ群の焦点距離の比を規定する。第１１レンズ群の焦点距離と第１２レンズ群の焦点距離を適切にすることでフォーカス群の移動量削減による合焦動作の高速化、第１レンズ群の全長および外径の小型化、および広角側の至近端での周辺光量確保、広角側のブリージングの抑制に寄与する。 Conditional expression (1) defines the ratio of the focal length of the eleventh lens group to the focal length of the twelfth lens group. By making the focal length of the eleventh lens group and the twelfth lens group appropriate, the focusing operation is speeded up by reducing the movement amount of the focus group, the total length and the outer diameter of the first lens group are reduced, and the wide angle. This contributes to securing the amount of peripheral light at the closest end on the side and suppressing breathing on the wide angle side.
条件式（１）の下限値を超えて、第１１レンズ群の負のパワーが強くなる、あるいは第１２レンズ群の負のパワーが弱くなると、フォーカス群である第１２レンズ群の移動量が大きくなり、第１レンズ群の小型化および高速な合焦動作、広角側での至近時の周辺光量の確保が困難になる。 If the lower limit of conditional expression (1) is exceeded and the negative power of the eleventh lens group becomes stronger or the negative power of the twelfth lens group becomes weaker, the amount of movement of the twelfth lens group that is the focus group becomes larger. Accordingly, it is difficult to reduce the size of the first lens unit, to perform high-speed focusing operation, and to secure the amount of peripheral light at the closest angle on the wide-angle side.
また、条件式（１）の上限値を超えて、第１１レンズ群の負のパワーが弱くなると、第１２レンズ群への周辺光線の入射角の緩和が行えなくなる、広角化への余力がなくなる。また第１２レンズ群の負のパワーが強くなると、フォーカシングに伴う高次収差が発生し、収差補正が困難になる。さらに、広角端でのブリージングの抑制が困難になる。 If the upper limit of conditional expression (1) is exceeded and the negative power of the eleventh lens group becomes weak, the incident angle of the peripheral rays on the twelfth lens group cannot be relaxed, and there is no room for widening the angle. . In addition, when the negative power of the twelfth lens group becomes strong, high-order aberrations accompanying focusing occur, making it difficult to correct aberrations. Furthermore, it becomes difficult to suppress breathing at the wide-angle end.
なお、条件式（１）について、その下限値をさらに０．９０に、また、上限値をさらに９．００とすることで、前述の効果をより確実にすることができる。 Regarding conditional expression (1), the lower limit value is further set to 0.90, and the upper limit value is further set to 9.00, whereby the above-described effect can be further ensured.
条件式（２）は第１レンズ群の焦点距離と第１１レンズ群の焦点距離の比を規定する。第１レンズ群の焦点距離と第１１レンズ群の焦点距離を適切にすることで物体距離の変化に対するフォーカス時の収差変動の抑制、および第１レンズ群、全系光学系の全長及び外径の大型化の抑制に寄与する。 Conditional expression (2) defines the ratio of the focal length of the first lens group to the focal length of the eleventh lens group. By adjusting the focal length of the first lens group and the focal length of the eleventh lens group, it is possible to suppress aberration fluctuations during focusing with respect to changes in the object distance, and to determine the total length and outer diameter of the first lens group and the entire optical system. Contributes to suppression of enlargement.
条件式（２）の下限値を超えて、第１１レンズ群の負のパワーが弱くなると、物体距離の変化に対するｆ１１レンズ群の像点偏移が大きくなり、フォーカス群である第１２レンズ群の物体距離変化に対する倍率変化が大きくなるためフォーカス時の収差変動が大きくなる。 When the lower limit of conditional expression (2) is exceeded and the negative power of the eleventh lens group becomes weak, the image point shift of the f11 lens group with respect to the change in object distance increases, and the twelfth lens group that is the focus group Since the change in magnification with respect to the change in object distance increases, the aberration variation during focusing increases.
また、条件式（２）の上限値を超えて、第１１レンズ群の負のパワーが強くなると、第１１レンズ群を少ない枚数で構成することができなくなるため、第１レンズ群の大型化ひいては全系光学系の大型化を誘引する。 If the negative power of the eleventh lens group is increased beyond the upper limit value of conditional expression (2), the eleventh lens group cannot be configured with a small number of lenses. Invite larger optical systems.
なお、条件式（２）について、その下限値をさらに−０．５５に、また、上限値をさらに−０．０５とすることで、前述の効果をより確実にすることができる。 For conditional expression (2), the lower limit value is further set to -0.55, and the upper limit value is further set to -0.05, whereby the above-described effect can be further ensured.
条件式（３）は第２レンズ群から最後群までの望遠端での合成焦点距離と望遠端の焦点距離の比を規定する。第２レンズ群から最終群までの望遠端での合成焦点距離と望遠端の焦点距離を適切にすることでに寄与する。 Conditional expression (3) defines the ratio of the combined focal length at the telephoto end from the second lens group to the last group and the focal length at the telephoto end. This contributes to making the combined focal length at the telephoto end from the second lens group to the final group and the focal length at the telephoto end appropriate.
条件式（３）の下限値を超え、望遠端での第２レンズ群から最後群までの合成群の合成焦点距離が短くなると、最至近時での望遠端の実効焦点距離での合成群の倍率偏移が大きくなり、望遠端でのブリージングの抑制ができない。これは、以下の理由による。第１２群の繰り出しに対する第１群の像点移動は、相対的に第２レンズ群から最後群までの合成群の物点の移動になる。そのため合成群の物点の移動に対する合成群の倍率の変化は、その合成群の焦点距離が短いほど顕著になる。この合成倍率の変化量が大きいと最至近での望遠端での全系の焦点距離の変化が大きくなりブリージングを抑制できない。このため第２レンズ群から最後群までの望遠端での合成焦点距離は上記条件が必要となる。 When the lower limit of conditional expression (3) is exceeded and the composite focal length of the composite group from the second lens group to the last group at the telephoto end becomes short, the composite group at the effective focal length of the telephoto end at the closest distance becomes shorter. The magnification shift becomes large and breathing cannot be suppressed at the telephoto end. This is due to the following reason. The image point movement of the first group relative to the extension of the twelfth group is relatively the movement of the object point of the composite group from the second lens group to the last group. Therefore, the change of the magnification of the composite group with respect to the movement of the object point of the composite group becomes more remarkable as the focal length of the composite group is shorter. If the amount of change in the combination magnification is large, the change in focal length of the entire system at the telephoto end at the closest distance becomes large, and breathing cannot be suppressed. For this reason, the above-mentioned condition is necessary for the combined focal length at the telephoto end from the second lens group to the last group.
なお、条件式（３）について、その下限値をさらに０．５０とすることで、前述の効果をより確実にすることができる。 In addition, regarding the conditional expression (3), when the lower limit value is further set to 0.50, the above-described effect can be further ensured.
次に、本発明のズームレンズに係る実施例のレンズ構成について説明する。なお、以下の説明ではレンズ構成を物体側から像側の順番で記載する。 Next, a lens configuration of an example according to the zoom lens of the present invention will be described. In the following description, the lens configuration is described in order from the object side to the image side.
以下に、前述した本発明のズームレンズの各実施例の具体的な数値データを示す。 Specific numerical data of each embodiment of the zoom lens of the present invention described above will be shown below.
［面データ］において、面番号は物体側から数えたレンズ面又は開口絞りの番号、ｒは各面の曲率半径、ｄは各面の間隔、ｎｄはｄ線（波長５８７．５６ｎｍ）に対する屈折率、ｖｄはｄ線に対するアッベ数を示している。 In [Surface data], the surface number is the number of the lens surface or aperture stop counted from the object side, r is the radius of curvature of each surface, d is the distance between the surfaces, nd is the refractive index with respect to the d-line (wavelength 587.56 nm). , Vd indicate Abbe numbers for the d line.
面番号に付した＊（アスタリスク）は、そのレンズ面形状が非球面であることを示している。また、ＢＦはバックフォーカスを表している。 The * (asterisk) attached to the surface number indicates that the lens surface shape is an aspherical surface. BF represents back focus.
面番号に付した（絞り）は、その位置に開口絞りＳが位置していることを示している。平面又は開口絞りＳに対する曲率半径には∞（無限大）を記入している。 The (diaphragm) attached to the surface number indicates that the aperture stop S is located at that position. ∞ (infinity) is entered in the radius of curvature for the plane or aperture stop S.
［非球面データ］には、［面データ］において＊を付したレンズ面の非球面形状を与える各係数値を示している。非球面の形状は、非球面の形状は、光軸に直行する方向への光軸からの変位をｙ、非球面と光軸の交点から光軸方向への変位（サグ量）をＺ、基準球面の曲率半径をｒ、コーニック係数をＫ、４、６、８、１０、１２、１４、１６次の非球面係数をそれぞれＡ４、Ａ６、Ａ８、Ａ１０、Ａ１２、Ａ１４、Ａ１６と置くとき、非球面の座標が以下の式で表されるものとする。
［各種データ］には、各焦点距離状態における焦点距離等の値を示している。 [Various data] shows values such as the focal length in each focal length state.
［可変間隔データ］には、各焦点距離状態における可変間隔及びＢＦ（バックフォーカス）の値を示している。 [Variable interval data] indicates the value of the variable interval and BF (back focus) in each focal length state.
［レンズ群データ］には、各レンズ群を構成する最も物体側の面番号及び群全体の合成焦点距離を示している。 [Lens Group Data] indicates the surface number of the most object side constituting each lens group and the combined focal length of the entire group.
なお、以下の全ての諸元の値において、記載している焦点距離ｆ、曲率半径ｒ、レンズ面間隔ｄ、その他の長さの単位は特記のない限りミリメートル（ｍｍ）を使用するが、光学系では比例拡大と比例縮小とにおいても同等の光学性能が得られるので、これに限られるものではない。 In all the values of the following specifications, the focal length f, the radius of curvature r, the lens surface interval d, and other length units described are in millimeters (mm) unless otherwise specified. In the system, the same optical performance can be obtained even in proportional expansion and proportional reduction, and the present invention is not limited to this.
また、各実施例に対応する収差図において、ｄ、ｇ、Ｃはそれぞれｄ線、ｇ線、Ｃ線を表しており、△Ｓ、△Ｍはそれぞれサジタル像面、メリジオナル像面を表している。 In the aberration diagrams corresponding to each example, d, g, and C represent d-line, g-line, and C-line, respectively, and ΔS and ΔM represent sagittal image plane and meridional image plane, respectively. .
さらに、図１、図１４、図２７及び図４０に示すレンズ構成図において、矢印は広角端から望遠端への変倍に際してのレンズ群の軌跡、Ｉは像面、中心を通る一点鎖線は光軸である。 Further, in the lens configuration diagrams shown in FIGS. 1, 14, 27, and 40, the arrow indicates the locus of the lens unit during zooming from the wide-angle end to the telephoto end, I indicates the image plane, and the alternate long and short dash line passes through the center. Is the axis.
図１は、本発明の実施例１のズームレンズのレンズ構成図である。実施例１のズームレンズは、物体側より順に正パワーの第１レンズ群Ｇ１、負パワーの第２レンズ群Ｇ２、負パワーの第３レンズ群Ｇ３、正パワーの第４レンズ群Ｇ４で構成され、広角端におけるブリージングの度合Ｂは−４．５％である。 FIG. 1 is a lens configuration diagram of a zoom lens according to Example 1 of the present invention. The zoom lens according to the first exemplary embodiment includes, in order from the object side, a first lens group G1 having a positive power, a second lens group G2 having a negative power, a third lens group G3 having a negative power, and a fourth lens group G4 having a positive power. The degree B of breathing at the wide-angle end is −4.5%.
第１レンズ群Ｇ１は、負のパワーを有する第１１レンズ群Ｇ１１と、負のパワーを有する第１２レンズ群Ｇ１２と、正のパワーを有する第１３レンズ群Ｇ１３とから成る。第１１レンズ群Ｇ１１は、物体側に凸面を向けた負メニスカスレンズから成り、第１２レンズ群Ｇ１２は、両凹の負レンズと、両凹レンズと正レンズから成る接合の負レンズとから成り、第１３レンズ群Ｇ１３は、像側の面が非球面形状の両凸レンズと、物体側に凸面を向けた負メニスカスレンズと両凸レンズから成る接合の正レンズと、両凸レンズと、物体側に凸面を向けた正メニスカスレンズとから成る。 The first lens group G1 includes an eleventh lens group G11 having negative power, a twelfth lens group G12 having negative power, and a thirteenth lens group G13 having positive power. The eleventh lens group G11 is composed of a negative meniscus lens having a convex surface directed toward the object side. The twelfth lens group G12 is composed of a biconcave negative lens and a cemented negative lens composed of a biconcave lens and a positive lens. The thirteen lens group G13 includes a biconvex lens having an aspheric surface on the image side, a negative positive meniscus lens having a convex surface facing the object side, a cemented positive lens composed of a biconvex lens, a biconvex lens, and a convex surface facing the object side. It consists of a positive meniscus lens.
第２レンズ群Ｇ２は、物体側に非球面形状の凸面を向ける負メニスカスレンズと、両凹レンズと、両凸レンズと、物体側に凹面を向けた負メニスカスレンズとから成る。第３レンズ群Ｇ３は、両凹レンズと両凸レンズから成る接合の負レンズとから成る。 The second lens group G2 includes a negative meniscus lens having an aspherical convex surface facing the object side, a biconcave lens, a biconvex lens, and a negative meniscus lens having a concave surface facing the object side. The third lens group G3 includes a biconcave lens and a cemented negative lens composed of a biconvex lens.
第４レンズ群Ｇ４は、開口絞りＳと、物体側に凹面を向けた正メニスカスレンズと、両凸レンズと、両凸レンズと両凹レンズから成る接合の負レンズと、両凸レンズと、両凹レンズと、両凸レンズと、両凹レンズと、両凸レンズと、両凸レンズと、両凸レンズとから成る。 The fourth lens group G4 includes an aperture stop S, a positive meniscus lens having a concave surface directed toward the object side, a biconvex lens, a cemented negative lens composed of a biconvex lens and a biconcave lens, a biconvex lens, a biconcave lens, It consists of a convex lens, a biconcave lens, a biconvex lens, a biconvex lens, and a biconvex lens.
また、実施例１に係るズームレンズは、無限遠物体から近距離物体へのフォーカシングに際し、第２レンズ群Ｇ２が、光軸に沿って物体側に移動する。広角端から望遠端への変倍に際して、第１レンズ群Ｇ１と第４レンズ群Ｇ４は固定であり、第１レンズ群Ｇ１と第２レンズ群Ｇ２との間隔は大きくなり、第２レンズ群Ｇ２と第３レンズ群Ｇ３との間隔は非線形に変化する。 In the zoom lens according to Example 1, the second lens group G2 moves toward the object side along the optical axis when focusing from an object at infinity to an object at a short distance. During zooming from the wide-angle end to the telephoto end, the first lens group G1 and the fourth lens group G4 are fixed, the distance between the first lens group G1 and the second lens group G2 is increased, and the second lens group G2 And the third lens group G3 change non-linearly.
続いて、以下に実施例１に係るズームレンズの諸元値を示す。
数値実施例1
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ (d0)
1 1000.0000 3.0000 1.51633 64.06
2 391.8597 （ｄ2）
3 -1465.5591 3.2000 1.88300 40.80
4 742.3004 9.5174
5 -259.5386 3.3000 1.77250 49.62
6 200.5809 7.0083 1.80810 22.76
7 10417.8212 （ｄ7）
8 172.4190 15.8627 1.60311 60.64
9* -286.0173 0.1500
10 202.8715 3.0000 2.00069 25.46
11 106.0788 0.2892
12 107.6858 18.6617 1.43385 95.23
13 -263.8648 0.1500
14 409.4214 5.1589 1.43385 95.23
15 -256717.9478 0.1500
16 97.0116 9.6200 1.49700 81.61
17 233.7938 （ｄ17）
18* 239.036 1.5000 1.81600 46.62
19 31.5683 9.8700
20 -48.9809 1.3000 1.61800 63.33
21 304.1380 0.1500
22 67.9519 8.5000 1.72047 34.71
23 -43.1187 1.1300
24 -34.1655 1.3000 1.61800 63.33
25 -290.2002 （ｄ25）
26 -82.7687 1.5000 1.83400 37.34
27 79.9092 4.0000 1.84666 23.78
28 -434.7743 （ｄ28）
29（絞り） ∞ 2.0000
30 -5985.8387 5.2501 1.62041 60.31
31 -77.6159 0.2000
32 136.2796 4.6491 1.62041 60.31
33 -353.1487 0.2000
34 78.3166 16.8430 1.49700 81.61
35 -79.0907 1.5000 2.00069 25.46
36 280.8171 0.1500
37 55.3073 6.7227 1.61800 63.33
38 -310.4864 28.2300
39 -108.7786 1.0000 1.90366 31.31
40 45.2570 3.8400
41 49.8688 4.8589 1.92286 18.90
42 -137.0932 11.7100
43 -71.4429 1.0000 2.00330 28.27
44 48.9206 2.5500
45 3785.3706 4.0283 1.51633 64.06
46 -52.9462 0.1500
47 100.8412 5.5944 1.51633 64.06
48 -190.3703 5.0100
49 56.0696 4.5000 1.48749 70.24
50 -348.2073 41.0001
像面 ∞
[非球面データ]
9面 18面
K 0.00000 0.00000
A4 5.64154E-08 1.09182E-06
A6 5.65076E-14 2.38258E-10
A8 3.77848E-16 5.97733E-12
A10 -3.66386E-19 -4.23736E-14
A12 1.26936E-22 1.70088E-16
A14 -1.60114E-26 -3.23951E-19
A16 0.00000E+00 2.51286E-22
[各種データ]
ズーム比 10.00
広角 中間 望遠
焦点距離 30.00 90.13 300.13
Fナンバー 2.83 2.83 3.53
全画角2ω 56.98 18.72 5.71
像高Y 15.55 15.55 15.55
レンズ全長 409.00 409.00 409.00
[可変間隔データ]
広角 中間 望遠
d0 無限遠 無限遠 無限遠
d2 27.3250 27.3250 27.3250
d7 6.5600 6.5600 6.5600
d17 1.7200 68.6400 106.8000
d25 108.0400 26.9300 7.1100
d28 6.0500 20.2400 1.9000
BF 41.0001 41.0004 41.0020
広角 中間 望遠
d0 1391.0000 1391.0000 1391.0000
d2 6.5587 6.5587 6.5587
d7 27.3263 27.3263 27.3263
d17 1.7200 68.6400 106.8000
d25 108.0400 26.9300 7.1100
d28 6.0500 20.2400 1.9000
BF 41.0001 41.0004 41.0020
[レンズ群データ]
群 始面 焦点距離
G1 1 149.91
G2 18 -38.54
G3 26 -126.40
G4 29 67.01
Subsequently, specification values of the zoom lens according to Example 1 are shown below.
Numerical example 1
Unit: mm
[Surface data]
Surface number rd nd vd
Object ∞ (d0)
1 1000.0000 3.0000 1.51633 64.06
2 391.8597 (d2)
3 -1465.5591 3.2000 1.88300 40.80
4 742.3004 9.5174
5 -259.5386 3.3000 1.77250 49.62
6 200.5809 7.0083 1.80810 22.76
7 10417.8212 (d7)
8 172.4190 15.8627 1.60311 60.64
9 * -286.0173 0.1500
10 202.8715 3.0000 2.00069 25.46
11 106.0788 0.2892
12 107.6858 18.6617 1.43385 95.23
13 -263.8648 0.1500
14 409.4214 5.1589 1.43385 95.23
15 -256717.9478 0.1500
16 97.0116 9.6200 1.49700 81.61
17 233.7938 (d17)
18 * 239.036 1.5000 1.81600 46.62
19 31.5683 9.8700
20 -48.9809 1.3000 1.61800 63.33
21 304.1380 0.1500
22 67.9519 8.5000 1.72047 34.71
23 -43.1187 1.1300
24 -34.1655 1.3000 1.61800 63.33
25 -290.2002 (d25)
26 -82.7687 1.5000 1.83400 37.34
27 79.9092 4.0000 1.84666 23.78
28 -434.7743 (d28)
29 (Aperture) ∞ 2.0000
30 -5985.8387 5.2501 1.62041 60.31
31 -77.6159 0.2000
32 136.2796 4.6491 1.62041 60.31
33 -353.1487 0.2000
34 78.3166 16.8430 1.49700 81.61
35 -79.0907 1.5000 2.00069 25.46
36 280.8171 0.1500
37 55.3073 6.7227 1.61800 63.33
38 -310.4864 28.2300
39 -108.7786 1.0000 1.90366 31.31
40 45.2570 3.8400
41 49.8688 4.8589 1.92286 18.90
42 -137.0932 11.7100
43 -71.4429 1.0000 2.00330 28.27
44 48.9206 2.5500
45 3785.3706 4.0283 1.51633 64.06
46 -52.9462 0.1500
47 100.8412 5.5944 1.51633 64.06
48 -190.3703 5.0100
49 56.0696 4.5000 1.48749 70.24
50 -348.2073 41.0001
Image plane ∞
[Aspherical data]
9th 18th
K 0.00000 0.00000
A4 5.64154E-08 1.09182E-06
A6 5.65076E-14 2.38258E-10
A8 3.77848E-16 5.97733E-12
A10 -3.66386E-19 -4.23736E-14
A12 1.26936E-22 1.70088E-16
A14 -1.60114E-26 -3.23951E-19
A16 0.00000E + 00 2.51286E-22
[Various data]
Zoom ratio 10.00
Wide angle Medium telephoto Focal length 30.00 90.13 300.13
F number 2.83 2.83 3.53
Full angle of view 2ω 56.98 18.72 5.71
Image height Y 15.55 15.55 15.55
Total lens length 409.00 409.00 409.00
[Variable interval data]
Wide angle Medium telephoto
d0 infinity infinity infinity infinity
d2 27.3250 27.3250 27.3250
d7 6.5600 6.5600 6.5600
d17 1.7200 68.6400 106.8000
d25 108.0400 26.9300 7.1100
d28 6.0500 20.2400 1.9000
BF 41.0001 41.0004 41.0020
Wide angle Medium telephoto
d0 1391.0000 1391.0000 1391.0000
d2 6.5587 6.5587 6.5587
d7 27.3263 27.3263 27.3263
d17 1.7200 68.6400 106.8000
d25 108.0400 26.9300 7.1100
d28 6.0500 20.2400 1.9000
BF 41.0001 41.0004 41.0020
[Lens group data]
Group Start surface Focal length
G2 18 -38.54
G3 26 -126.40
G4 29 67.01
図１４は、本発明の実施例２のズームレンズのレンズ構成図である。実施例２のズームレンズは、物体側より順に正パワーの第１レンズ群Ｇ１、負パワーの第２レンズ群Ｇ２、負パワーの第３レンズ群Ｇ３、正パワーの第４レンズ群Ｇ４で構成され、広角端におけるブリージングの度合Ｂは−３．３％である。 FIG. 14 is a lens configuration diagram of a zoom lens according to Example 2 of the present invention. The zoom lens according to the second exemplary embodiment includes, in order from the object side, a first lens group G1 having a positive power, a second lens group G2 having a negative power, a third lens group G3 having a negative power, and a fourth lens group G4 having a positive power. The degree B of breathing at the wide-angle end is −3.3%.
第１レンズ群Ｇ１は、負のパワーを有する第１１レンズ群Ｇ１１と、負のパワーを有する第１２レンズ群Ｇ１２と、正のパワーを有する第１３レンズ群Ｇ１３とから成る。第１１レンズ群Ｇ１１は、物体側に凸面を向けた負メニスカスレンズから成り、第１２レンズ群Ｇ１２は、物体側に凹面を向けた負メニスカスレンズと、両凹レンズと両凸レンズから成る接合の負レンズとから成り、第１３レンズ群Ｇ１３は、像側の面が非球面形状の両凸レンズと、物体側に凸面を向けた負メニスカスレンズと、両凸レンズと、物体側に凸面を向けた正メニスカスレンズとから成る。 The first lens group G1 includes an eleventh lens group G11 having negative power, a twelfth lens group G12 having negative power, and a thirteenth lens group G13 having positive power. The eleventh lens group G11 includes a negative meniscus lens having a convex surface directed toward the object side, and the twelfth lens group G12 includes a negative meniscus lens having a concave surface directed toward the object side, and a cemented negative lens including a biconcave lens and a biconvex lens. The thirteenth lens group G13 includes a biconvex lens having an aspheric surface on the image side, a negative meniscus lens having a convex surface directed toward the object side, a biconvex lens, and a positive meniscus lens having a convex surface directed toward the object side. It consists of.
第２レンズ群Ｇ２は、物体側に非球面形状の凸面を向ける負メニスカスレンズと、両凹レンズと、両凸レンズと、両凹レンズとから成る。第３レンズ群Ｇ３は、両凹レンズと両凸レンズから成る接合の負レンズとから成る。 The second lens group G2 includes a negative meniscus lens having an aspheric convex surface facing the object side, a biconcave lens, a biconvex lens, and a biconcave lens. The third lens group G3 includes a biconcave lens and a cemented negative lens composed of a biconvex lens.
第４レンズ群Ｇ４は、開口絞りＳと、両凸レンズと、両凸レンズと、両凸レンズと両凹レンズの接合から成る接合の負レンズと、両凸レンズと、物体側に凹面を向けた負メニスカスレンズと、両凸レンズと、両凹レンズと、両凸レンズと、両凸レンズとから成る。 The fourth lens group G4 includes an aperture stop S, a biconvex lens, a biconvex lens, a cemented negative lens formed by cementing a biconvex lens and a biconcave lens, a biconvex lens, and a negative meniscus lens having a concave surface facing the object side. It consists of a biconvex lens, a biconcave lens, a biconvex lens, and a biconvex lens.
また、実施例２に係るズームレンズは、無限遠物体から近距離物体へのフォーカシングに際し、第２レンズ群Ｇ２が、光軸に沿って物体側に移動する。広角端から望遠端への変倍に際して、第１レンズ群Ｇ１と第４レンズ群Ｇ４は固定であり、第１レンズ群Ｇ１と第２レンズ群Ｇ２との間隔は大きくなり、第２レンズ群Ｇ２と第３レンズ群Ｇ３との間隔は非線形に変化する。 In the zoom lens according to Example 2, the second lens group G2 moves toward the object side along the optical axis when focusing from an object at infinity to an object at a short distance. During zooming from the wide-angle end to the telephoto end, the first lens group G1 and the fourth lens group G4 are fixed, the distance between the first lens group G1 and the second lens group G2 is increased, and the second lens group G2 And the third lens group G3 change non-linearly.
続いて、以下に実施例２に係るズームレンズの諸元値を示す。
数値実施例2
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ (d0)
1 1194.8340 3.0000 1.51633 64.06
2 152.8513 （ｄ2）
3 -319.3858 3.2000 1.88300 40.80
4 -539.0024 7.4960
5 -186.1964 3.3000 1.77250 49.62
6 1199.5389 5.7057 1.80810 22.76
7 -357.4856 （ｄ7）
8 199.2302 17.3340 1.60311 60.64
9* -197.8151 0.1500
10 265.2209 3.0000 2.00069 25.46
11 121.4933 2.0987
12 144.0480 16.4737 1.43700 95.10
13 -270.6327 0.1500
14 98.2990 14.3060 1.49700 81.61
15 755.6793 （ｄ15）
16* 548.1555 1.5000 1.81600 46.62
17 40.3649 9.8700
18 -91.7065 1.3000 1.43700 95.10
19 108.1978 0.1500
20 54.5926 8.5000 1.72825 28.32
21 -107.7145 3.1953
22 -59.7179 1.3000 1.77250 49.62
23 209.4098 （ｄ23）
24 -91.7537 1.5000 1.83400 37.34
25 68.7059 4.5374 1.84666 23.78
26 -1126.1859 （ｄ26）
27（絞り） ∞ 2.0000
28 266.9170 6.0000 1.58913 61.25
29 -84.5400 0.2000
30 169.1570 5.0000 1.63854 55.45
31 -226.1210 0.2000
32 112.5831 7.1800 1.49700 81.61
33 -75.6500 1.5000 1.90366 31.31
34 282.1087 0.1500
35 39.6572 9.3991 1.49700 81.61
36 -795.9796 23.8340
37 -58.2208 1.0000 1.83481 42.72
38 -135.4139 25.4761
39 137.0640 3.2841 1.92286 18.90
40 -104.0522 2.2696
41 -35.6876 1.0000 2.00330 28.27
42 45.1771 3.5768
43 205.2646 4.1362 1.43700 95.10
44 -61.7875 0.1500
45 51.6623 6.6010 1.59270 35.45
46 -63.7084 41.1180
像面 ∞
[非球面データ]
9面 16面
K 0.00000 0.00000
A4 5.54979E-08 3.93973E-07
A6 2.84187E-13 5.57550E-11
A8 -2.59982E-16 -1.13663E-12
A10 8.98778E-20 4.92124E-15
A12 -1.24486E-23 -9.31726E-18
A14 0.00000E+00 6.92340E-21
[各種データ]
ズーム比 10.00
広角 中間 望遠
焦点距離 29.99 90.72 299.50
Fナンバー 2.91 2.91 3.62
全画角2ω 56.99 18.54 5.72
像高Y 15.55 15.55 15.55
レンズ全長 411.98 411.99 411.99
[可変間隔データ]
広角 中間 望遠
d0 無限遠 無限遠 無限遠
d2 37.4679 37.4679 37.4679
d7 6.5600 6.5600 6.5600
d15 1.7200 68.6400 106.8000
d23 108.0300 26.9200 7.1000
d26 6.0600 20.2500 1.9100
BF 41.1180 41.1285 41.1246
広角 中間 望遠
d0 1388.0204 1388.0099 1388.0138
d2 14.4563 14.4562 14.4562
d7 29.5716 29.5717 29.5717
d15 1.7200 68.6400 106.8000
d23 108.0300 26.9200 7.1000
d26 6.0600 20.2500 1.9100
BF 41.1180 41.1285 41.1246
[レンズ群データ]
群 始面 焦点距離
G1 1 136.70
G2 16 -38.56
G3 23 -123.00
G4 27 60.13
Subsequently, specification values of the zoom lens according to Example 2 are shown below.
Numerical example 2
Unit: mm
[Surface data]
Surface number rd nd vd
Object ∞ (d0)
1 1194.8340 3.0000 1.51633 64.06
2 152.8513 (d2)
3 -319.3858 3.2000 1.88300 40.80
4 -539.0024 7.4960
5 -186.1964 3.3000 1.77250 49.62
6 1199.5389 5.7057 1.80810 22.76
7 -357.4856 (d7)
8 199.2302 17.3340 1.60311 60.64
9 * -197.8151 0.1500
10 265.2209 3.0000 2.00069 25.46
11 121.4933 2.0987
12 144.0480 16.4737 1.43700 95.10
13 -270.6327 0.1500
14 98.2990 14.3060 1.49700 81.61
15 755.6793 (d15)
16 * 548.1555 1.5000 1.81600 46.62
17 40.3649 9.8700
18 -91.7065 1.3000 1.43700 95.10
19 108.1978 0.1500
20 54.5926 8.5000 1.72825 28.32
21 -107.7145 3.1953
22 -59.7179 1.3000 1.77250 49.62
23 209.4098 (d23)
24 -91.7537 1.5000 1.83400 37.34
25 68.7059 4.5374 1.84666 23.78
26 -1126.1859 (d26)
27 (Aperture) ∞ 2.0000
28 266.9170 6.0000 1.58913 61.25
29 -84.5400 0.2000
30 169.1570 5.0000 1.63854 55.45
31 -226.1210 0.2000
32 112.5831 7.1800 1.49700 81.61
33 -75.6500 1.5000 1.90366 31.31
34 282.1087 0.1500
35 39.6572 9.3991 1.49700 81.61
36 -795.9796 23.8340
37 -58.2208 1.0000 1.83481 42.72
38 -135.4139 25.4761
39 137.0640 3.2841 1.92286 18.90
40 -104.0522 2.2696
41 -35.6876 1.0000 2.00330 28.27
42 45.1771 3.5768
43 205.2646 4.1362 1.43700 95.10
44 -61.7875 0.1500
45 51.6623 6.6010 1.59270 35.45
46 -63.7084 41.1180
Image plane ∞
[Aspherical data]
9 faces 16 faces
K 0.00000 0.00000
A4 5.54979E-08 3.93973E-07
A6 2.84187E-13 5.57550E-11
A8 -2.59982E-16 -1.13663E-12
A10 8.98778E-20 4.92124E-15
A12 -1.24486E-23 -9.31726E-18
A14 0.00000E + 00 6.92340E-21
[Various data]
Zoom ratio 10.00
Wide angle Medium telephoto Focal length 29.99 90.72 299.50
F number 2.91 2.91 3.62
Full angle 2ω 56.99 18.54 5.72
Image height Y 15.55 15.55 15.55
Total lens length 411.98 411.99 411.99
[Variable interval data]
Wide angle Medium telephoto
d0 infinity infinity infinity infinity
d2 37.4679 37.4679 37.4679
d7 6.5600 6.5600 6.5600
d15 1.7200 68.6400 106.8000
d23 108.0300 26.9200 7.1000
d26 6.0600 20.2500 1.9100
BF 41.1180 41.1285 41.1246
Wide angle Medium telephoto
d0 1388.0204 1388.0099 1388.0138
d2 14.4563 14.4562 14.4562
d7 29.5716 29.5717 29.5717
d15 1.7200 68.6400 106.8000
d23 108.0300 26.9200 7.1000
d26 6.0600 20.2500 1.9100
BF 41.1180 41.1285 41.1246
[Lens group data]
Group Start surface Focal length
G2 16 -38.56
G3 23 -123.00
G4 27 60.13
図２７は、本発明の実施例３のズームレンズのレンズ構成図である。実施例３のズームレンズは、物体側より順に正パワーの第１レンズ群Ｇ１、負パワーの第２レンズ群Ｇ２、負パワーの第３レンズ群Ｇ３、正パワーの第４レンズ群Ｇ４で構成され、広角端におけるブリージングの度合Ｂは−３．８％である。第１レンズ群Ｇ１は、物体側に凸面を向けた負メニスカスレンズと、両凹の負レンズと、両凹レンズと両凸レンズから成る接合の負レンズと、両面が非球面形状の両凸レンズと、物体側に凸面を向けた負メニスカスレンズと、両凸レンズと、両凸レンズとから成る。 FIG. 27 is a lens configuration diagram of a zoom lens according to Example 3 of the present invention. The zoom lens according to the third exemplary embodiment includes, in order from the object side, a first lens group G1 having a positive power, a second lens group G2 having a negative power, a third lens group G3 having a negative power, and a fourth lens group G4 having a positive power. The degree B of breathing at the wide-angle end is −3.8%. The first lens group G1 includes a negative meniscus lens having a convex surface directed toward the object side, a biconcave negative lens, a cemented negative lens composed of a biconcave lens and a biconvex lens, a biconvex lens having both aspheric surfaces, It consists of a negative meniscus lens with a convex surface facing side, a biconvex lens, and a biconvex lens.
第２レンズ群Ｇ２は、物体側に非球面形状の凸面を向ける負メニスカスレンズと、両凹レンズと、両凸レンズと、両凹レンズとから成る。第３レンズ群Ｇ３は、両凹レンズと両凸レンズから成る接合の負レンズとから成る。 The second lens group G2 includes a negative meniscus lens having an aspheric convex surface facing the object side, a biconcave lens, a biconvex lens, and a biconcave lens. The third lens group G3 includes a biconcave lens and a cemented negative lens composed of a biconvex lens.
第４レンズ群Ｇ４は、開口絞りＳと、両凸レンズ、両凸レンズと、両凸レンズと物体側に凹面を向けた負メニスカスレンズの接合から成る接合の負レンズと、物体側に凸面を向けた正メニスカスレンズと、物体側に凹面を向けた負メニスカスレンズと、両凸レンズと、両凹レンズと、両凸レンズと、両凸レンズとから成る。 The fourth lens group G4 includes an aperture stop S, a biconvex lens, a biconvex lens, a cemented negative lens composed of a biconvex lens and a negative meniscus lens having a concave surface facing the object side, and a positive lens having a convex surface facing the object side. It consists of a meniscus lens, a negative meniscus lens with a concave surface facing the object side, a biconvex lens, a biconcave lens, a biconvex lens, and a biconvex lens.
また、実施例３に係るズームレンズは、無限遠物体から近距離物体へのフォーカシングに際し、第２レンズ群Ｇ２が、光軸に沿って物体側に移動する。広角端から望遠端への変倍に際して、第１レンズ群Ｇ１と第４レンズ群Ｇ４は固定であり、第１レンズ群Ｇ１と第２レンズ群Ｇ２との間隔は大きくなり、第２レンズ群Ｇ２と第３レンズ群Ｇ３との間隔は非線形に変化する。 In the zoom lens according to Example 3, the second lens group G2 moves toward the object side along the optical axis when focusing from an object at infinity to an object at a short distance. During zooming from the wide-angle end to the telephoto end, the first lens group G1 and the fourth lens group G4 are fixed, the distance between the first lens group G1 and the second lens group G2 is increased, and the second lens group G2 And the third lens group G3 change non-linearly.
続いて、以下に実施例３に係るズームレンズの諸元値を示す。
数値実施例3
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ (d0)
1 1194.8340 3.0000 1.48749 70.44
2 274.4944 （ｄ2）
3 -1648.6771 3.2000 1.88300 40.80
4 1674.8009 13.0011
5 -273.4802 3.3000 1.77250 49.62
6 237.6875 10.9160 1.80810 22.76
7 -33552.2972 （ｄ7）
8* 211.5352 19.1851 1.60311 60.64
9* -248.9219 0.1500
10 228.7933 3.0000 2.00069 25.46
11 111.9945 1.4555
12 122.2968 20.3185 1.43700 95.10
13 -358.3885 0.1500
14 97.2971 19.2378 1.49700 81.61
15 -22738.5955 （ｄ15）
16* 121.8485 1.5000 1.81600 46.62
17 27.6864 11.7708
18 -71.6586 1.3000 1.43700 95.10
19 77.2801 0.1500
20 42.9779 7.9279 1.71736 29.50
21 -96.4050 1.6538
22 -54.0548 1.3000 1.77250 49.62
23 222.0435 （ｄ23）
24 -72.9695 1.5000 1.83400 37.34
25 73.7216 3.8737 1.84666 23.78
26 -345.7096 （ｄ26）
27（絞り） ∞ 2.0000
28 198.7823 5.8473 1.60739 56.71
29 -68.8436 0.2000
30 152.2374 3.9238 1.62299 58.12
31 -301.2119 0.2000
32 492.6866 5.5552 1.49700 81.61
33 -50.2974 1.5000 1.90366 31.31
34 -1101.5196 0.1500
35 31.5243 8.9008 1.49700 81.61
36 370.1520 26.5760
37 -30.6248 1.0000 1.83481 42.72
38 -43.0102 10.6444
39 114.7625 3.2389 1.92286 18.90
40 -102.3271 1.5362
41 -32.4701 1.0000 2.00330 28.27
42 42.4627 3.5005
43 89.6102 4.3882 1.43700 95.10
44 -63.3212 0.1500
45 55.2943 5.9907 1.59270 35.45
46 -58.9703 41.1258
像面 ∞
[非球面データ]
8面 9面 16面
K 0.00000 0.00000 0.00000
A4 1.71212E-08 7.11689E-08 8.76055E-07
A6 -1.04009E-11 -1.00510E-11 -1.95036E-09
A8 1.47698E-15 1.02822E-15 6.61520E-12
A10 0.00000E+00 4.79082E-20 -3.02776E-15
A12 0.00000E+00 0.00000E+00 -2.44169E-17
A14 0.00000E+00 0.00000E+00 4.65468E-20
A16 0.00000E+00 0.00000E+00 -2.49823E-23
[各種データ]
ズーム比 12.46
広角 中間 望遠
焦点距離 24.00 75.48 298.96
Fナンバー 2.87 2.87 3.61
全画角2ω 68.57 22.13 5.78
像高Y 15.55 15.55 15.55
レンズ全長 412.02 412.02 412.01
[可変間隔データ]
広角 中間 望遠
d0 無限遠 無限遠 無限遠
d2 37.0929 37.0929 37.0929
d7 6.5600 6.5600 6.5600
d15 1.7400 66.0329 104.0383
d23 105.2585 26.0054 7.1100
d26 6.0500 21.0122 1.9000
BF 41.1258 41.1247 41.1192
広角 中間 望遠
d0 1387.9805 1387.9805 1387.9805
d2 12.6110 12.6110 12.6110
d7 31.0419 31.0419 31.0419
d15 1.7400 66.0329 104.0383
d23 105.2585 26.0054 7.1100
d26 6.0500 21.0122 1.9000
BF 41.1258 41.1247 41.1193
[レンズ群データ]
群 始面 焦点距離
G1 1 137.34
G2 16 -32.95
G3 24 -114.60
G4 27 54.20
Subsequently, specification values of the zoom lens according to Example 3 are shown below.
Numerical example 3
Unit: mm
[Surface data]
Surface number rd nd vd
Object ∞ (d0)
1 1194.8340 3.0000 1.48749 70.44
2 274.4944 (d2)
3 -1648.6771 3.2000 1.88300 40.80
4 1674.8009 13.0011
5 -273.4802 3.3000 1.77250 49.62
6 237.6875 10.9160 1.80810 22.76
7 -33552.2972 (d7)
8 * 211.5352 19.1851 1.60311 60.64
9 * -248.9219 0.1500
10 228.7933 3.0000 2.00069 25.46
11 111.9945 1.4555
12 122.2968 20.3185 1.43700 95.10
13 -358.3885 0.1500
14 97.2971 19.2378 1.49700 81.61
15 -22738.5955 (d15)
16 * 121.8485 1.5000 1.81600 46.62
17 27.6864 11.7708
18 -71.6586 1.3000 1.43700 95.10
19 77.2801 0.1500
20 42.9779 7.9279 1.71736 29.50
21 -96.4050 1.6538
22 -54.0548 1.3000 1.77250 49.62
23 222.0435 (d23)
24 -72.9695 1.5000 1.83400 37.34
25 73.7216 3.8737 1.84666 23.78
26 -345.7096 (d26)
27 (Aperture) ∞ 2.0000
28 198.7823 5.8473 1.60739 56.71
29 -68.8436 0.2000
30 152.2374 3.9238 1.62299 58.12
31 -301.2119 0.2000
32 492.6866 5.5552 1.49700 81.61
33 -50.2974 1.5000 1.90366 31.31
34 -1101.5196 0.1500
35 31.5243 8.9008 1.49700 81.61
36 370.1520 26.5760
37 -30.6248 1.0000 1.83481 42.72
38 -43.0102 10.6444
39 114.7625 3.2389 1.92286 18.90
40 -102.3271 1.5362
41 -32.4701 1.0000 2.00330 28.27
42 42.4627 3.5005
43 89.6102 4.3882 1.43700 95.10
44 -63.3212 0.1500
45 55.2943 5.9907 1.59270 35.45
46 -58.9703 41.1258
Image plane ∞
[Aspherical data]
8 faces 9 faces 16 faces
K 0.00000 0.00000 0.00000
A4 1.71212E-08 7.11689E-08 8.76055E-07
A6 -1.04009E-11 -1.00510E-11 -1.95036E-09
A8 1.47698E-15 1.02822E-15 6.61520E-12
A10 0.00000E + 00 4.79082E-20 -3.02776E-15
A12 0.00000E + 00 0.00000E + 00 -2.44169E-17
A14 0.00000E + 00 0.00000E + 00 4.65468E-20
A16 0.00000E + 00 0.00000E + 00 -2.49823E-23
[Various data]
Zoom ratio 12.46
Wide angle Medium telephoto Focal length 24.00 75.48 298.96
F number 2.87 2.87 3.61
Full angle of view 2ω 68.57 22.13 5.78
Image height Y 15.55 15.55 15.55
Total lens length 412.02 412.02 412.01
[Variable interval data]
Wide angle Medium telephoto
d0 infinity infinity infinity infinity
d2 37.0929 37.0929 37.0929
d7 6.5600 6.5600 6.5600
d15 1.7400 66.0329 104.0383
d23 105.2585 26.0054 7.1100
d26 6.0500 21.0122 1.9000
BF 41.1258 41.1247 41.1192
Wide angle Medium telephoto
d0 1387.9805 1387.9805 1387.9805
d2 12.6110 12.6110 12.6110
d7 31.0419 31.0419 31.0419
d15 1.7400 66.0329 104.0383
d23 105.2585 26.0054 7.1100
d26 6.0500 21.0122 1.9000
BF 41.1258 41.1247 41.1193
[Lens group data]
Group Start surface Focal length
G2 16 -32.95
G3 24 -114.60
G4 27 54.20
図１６は、本発明の実施例４のズームレンズのレンズ構成図である。実施例４のズームレンズは、物体側より順に正パワーの第１レンズ群Ｇ１、負パワーの第２レンズ群Ｇ２、負パワーの第３レンズ群Ｇ３、正パワーの第４レンズ群Ｇ４で構成され、広角端のブリージングの度合Ｂは−１．６％である。 FIG. 16 is a lens configuration diagram of a zoom lens according to Example 4 of the present invention. The zoom lens according to the fourth exemplary embodiment includes, in order from the object side, a first lens group G1 having a positive power, a second lens group G2 having a negative power, a third lens group G3 having a negative power, and a fourth lens group G4 having a positive power. The degree B of breathing at the wide-angle end is −1.6%.
第１レンズ群Ｇ１は、負のパワーを有する第１１レンズ群Ｇ１１と、負のパワーを有する第１２レンズ群Ｇ１２と、正のパワーを有する第１３レンズ群Ｇ１３とから成る。第１１レンズ群Ｇ１１は、物体側に凸面を向けた負メニスカスレンズから成り、第１２レンズ群Ｇ１２は、物体側に凹面を向けた負メニスカスレンズと、両凹レンズと正レンズから成る接合の負レンズとから成り、第１３レンズ群Ｇ１３は、両凸レンズと、物体側に凸面を向けた負メニスカスレンズと、両凸レンズと、両凸レンズと、物体側に凸面を向けた正メニスカスレンズとから成る。 The first lens group G1 includes an eleventh lens group G11 having negative power, a twelfth lens group G12 having negative power, and a thirteenth lens group G13 having positive power. The eleventh lens group G11 includes a negative meniscus lens having a convex surface directed toward the object side, and the twelfth lens group G12 includes a negative meniscus lens having a concave surface directed toward the object side, and a cemented negative lens including a biconcave lens and a positive lens. The thirteenth lens group G13 includes a biconvex lens, a negative meniscus lens having a convex surface directed toward the object side, a biconvex lens, a biconvex lens, and a positive meniscus lens having a convex surface directed toward the object side.
第２レンズ群Ｇ２は、物体側に非球面形状の凸面を向ける負メニスカスレンズと、両凹レンズと、両凸レンズと、両凹レンズとから成る。第３レンズ群Ｇ３は、両凹レンズと両凸レンズから成る接合の負レンズとから成る。 The second lens group G2 includes a negative meniscus lens having an aspheric convex surface facing the object side, a biconcave lens, a biconvex lens, and a biconcave lens. The third lens group G3 includes a biconcave lens and a cemented negative lens composed of a biconvex lens.
第４レンズ群Ｇ４は、開口絞りＳと、両凸レンズと、両凸レンズと、両凸レンズと両凹レンズの接合から成る接合の負レンズと、物体側に凸面を向けた正メニスカスレンズと、物体側に凹面を向けた負メニスカスレンズと、両凸レンズと、両凹レンズと、両凸レンズと、両凸レンズとから成る。 The fourth lens group G4 includes an aperture stop S, a biconvex lens, a biconvex lens, a cemented negative lens formed by cementing a biconvex lens and a biconcave lens, a positive meniscus lens having a convex surface facing the object side, and an object side. It consists of a negative meniscus lens with a concave surface, a biconvex lens, a biconcave lens, a biconvex lens, and a biconvex lens.
また、実施例４に係るズームレンズは、無限遠物体から近距離物体へのフォーカシングに際し、第２レンズ群Ｇ２が、光軸に沿って物体側に移動する。広角端から望遠端への変倍に際して、第１レンズ群Ｇ１と第４レンズ群Ｇ４は固定であり、第１レンズ群Ｇ１と第２レンズ群Ｇ２との間隔は大きくなり、第２レンズ群Ｇ２と第３レンズ群Ｇ３との間隔は非線形に変化する。 In the zoom lens according to Example 4, the second lens group G2 moves toward the object side along the optical axis during focusing from an object at infinity to an object at a short distance. During zooming from the wide-angle end to the telephoto end, the first lens group G1 and the fourth lens group G4 are fixed, the distance between the first lens group G1 and the second lens group G2 is increased, and the second lens group G2 And the third lens group G3 change non-linearly.
続いて、以下に実施例４に係るズームレンズの諸元値を示す。
数値実施例4
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ (d0)
1 1194.8340 3.0000 1.51633 64.06
2 163.5369 （ｄ2）
3 -364.1882 3.2000 1.88300 40.80
4 -988.0473 7.7499
5 -217.6429 3.3000 1.77250 49.62
6 385.8968 6.5381 1.80810 22.76
7 -575.8873 （ｄ7）
8 685.2397 13.3917 1.60311 60.64
9 -185.6194 0.1500
10 489.3498 3.0000 2.00069 25.46
11 156.3442 0.1500
12 150.4940 16.8225 1.43700 95.10
13 -277.1989 0.1500
14 174.9212 11.3403 1.49700 81.61
15 -1659.3693 0.1500
16 113.0889 14.5495 1.49700 81.61
17 478.1057 （ｄ17）
18* 142.9915 1.5000 1.81600 46.62
19 39.2958 9.8700
20 -60.4566 1.3000 1.43700 95.10
21 442.9868 0.1500
22 54.6268 8.5000 1.72825 28.32
23 -102.0035 3.4684
24 -49.5488 1.3000 1.77250 49.62
25 135.9574 （ｄ25）
26 -86.9358 1.5000 1.83400 37.34
27 84.5120 4.1800 1.84666 23.78
28 -613.2885 （ｄ28）
29（絞り） ∞ 2.0000
30 296.3861 6.1938 1.58913 61.25
31 -75.6243 0.2000
32 149.0657 4.0478 1.63854 55.45
33 -442.0041 0.2000
34 194.9172 6.8644 1.49700 81.61
35 -67.1529 1.5000 1.90366 31.31
36 8586.5865 0.1500
37 37.0163 9.9665 1.49700 81.61
38 946.2247 27.9198
39 -42.6784 1.0000 1.83481 42.72
40 -78.9172 18.1386
41 117.3945 3.3228 1.92286 18.90
42 -127.1489 1.6496
43 -37.7961 1.0000 2.00330 28.27
44 42.0840 4.4341
45 81.2002 5.4679 1.43700 95.10
46 -62.6934 0.1500
47 59.1877 6.7720 1.59270 35.45
48 -70.8327 41.1385
像面 ∞
[非球面データ]
18面
K 0.00000
A4 7.67513E-07
A6 4.89190E-10
A8 3.00994E-13
A10 1.04587E-15
A12 -9.32849E-18
A14 2.19255E-20
A16 -1.44571E-23
[各種データ]
ズーム比 9.99
広角 中間 望遠
焦点距離 30.00 89.49 299.80
Fナンバー 2.83 2.83 3.54
全画角2ω 56.50 18.88 5.75
像高Y 15.55 15.55 15.55
レンズ全長 412.00 411.99 412.00
[可変間隔データ]
広角 中間 望遠
d0 無限遠 無限遠 無限遠
d2 32.2536 32.2536 32.2536
d7 6.5600 6.5600 6.5600
d17 1.7200 67.7801 106.8000
d25 108.0400 27.0300 7.1100
d28 6.0500 21.0000 1.9000
BF 41.1385 41.1307 41.1396
広角 中間 望遠
d0 1388.0000 1388.0000 1387.9989
d2 13.5592 13.5592 13.5592
d7 25.2544 25.2544 25.2544
d17 1.7200 67.7801 106.8000
d25 108.0400 27.0300 7.1100
d28 6.0500 21.0000 1.9000
BF 41.1385 41.1307 41.1396
[レンズ群データ]
群 始面 焦点距離
G1 1 137.71
G2 18 -38.45
G3 26 -124.67
G4 29 63.23
Subsequently, specification values of the zoom lens according to Example 4 are shown below.
Numerical example 4
Unit: mm
[Surface data]
Surface number rd nd vd
Object ∞ (d0)
1 1194.8340 3.0000 1.51633 64.06
2 163.5369 (d2)
3 -364.1882 3.2000 1.88300 40.80
4 -988.0473 7.7499
5 -217.6429 3.3000 1.77250 49.62
6 385.8968 6.5381 1.80810 22.76
7 -575.8873 (d7)
8 685.2397 13.3917 1.60311 60.64
9 -185.6194 0.1500
10 489.3498 3.0000 2.00069 25.46
11 156.3442 0.1500
12 150.4940 16.8225 1.43700 95.10
13 -277.1989 0.1500
14 174.9212 11.3403 1.49700 81.61
15 -1659.3693 0.1500
16 113.0889 14.5495 1.49700 81.61
17 478.1057 (d17)
18 * 142.9915 1.5000 1.81600 46.62
19 39.2958 9.8700
20 -60.4566 1.3000 1.43700 95.10
21 442.9868 0.1500
22 54.6268 8.5000 1.72825 28.32
23 -102.0035 3.4684
24 -49.5488 1.3000 1.77250 49.62
25 135.9574 (d25)
26 -86.9358 1.5000 1.83400 37.34
27 84.5120 4.1800 1.84666 23.78
28 -613.2885 (d28)
29 (Aperture) ∞ 2.0000
30 296.3861 6.1938 1.58913 61.25
31 -75.6243 0.2000
32 149.0657 4.0478 1.63854 55.45
33 -442.0041 0.2000
34 194.9172 6.8644 1.49700 81.61
35 -67.1529 1.5000 1.90366 31.31
36 8586.5865 0.1500
37 37.0163 9.9665 1.49700 81.61
38 946.2247 27.9198
39 -42.6784 1.0000 1.83481 42.72
40 -78.9172 18.1386
41 117.3945 3.3228 1.92286 18.90
42 -127.1489 1.6496
43 -37.7961 1.0000 2.00330 28.27
44 42.0840 4.4341
45 81.2002 5.4679 1.43700 95.10
46 -62.6934 0.1500
47 59.1877 6.7720 1.59270 35.45
48 -70.8327 41.1385
Image plane ∞
[Aspherical data]
18 sides
K 0.00000
A4 7.67513E-07
A6 4.89190E-10
A8 3.00994E-13
A10 1.04587E-15
A12 -9.32849E-18
A14 2.19255E-20
A16 -1.44571E-23
[Various data]
Zoom ratio 9.99
Wide angle Medium telephoto Focal length 30.00 89.49 299.80
F number 2.83 2.83 3.54
Full angle of view 2ω 56.50 18.88 5.75
Image height Y 15.55 15.55 15.55
Total lens length 412.00 411.99 412.00
[Variable interval data]
Wide angle Medium telephoto
d0 infinity infinity infinity infinity
d2 32.2536 32.2536 32.2536
d7 6.5600 6.5600 6.5600
d17 1.7200 67.7801 106.8000
d25 108.0400 27.0300 7.1100
d28 6.0500 21.0000 1.9000
BF 41.1385 41.1307 41.1396
Wide angle Medium telephoto
d0 1388.0000 1388.0000 1387.9989
d2 13.5592 13.5592 13.5592
d7 25.2544 25.2544 25.2544
d17 1.7200 67.7801 106.8000
d25 108.0400 27.0300 7.1100
d28 6.0500 21.0000 1.9000
BF 41.1385 41.1307 41.1396
[Lens group data]
Group Start surface Focal length
G2 18 -38.45
G3 26 -124.67
G4 29 63.23
なお、本発明では第１１レンズ群を負のパワーを持つ単レンズで構成しているが、そのレンズの片面あるいは両面を非球面化し球面収差、非点収差等の補正能力を上げる、あるいは回折光学素子を付加し色収差補正能力を上げることも可能である。 In the present invention, the eleventh lens group is composed of a single lens having a negative power. However, one or both surfaces of the lens are made aspherical to improve the correction capability for spherical aberration, astigmatism, etc., or diffractive optics. It is also possible to increase the chromatic aberration correction capability by adding an element.
また、これらの各実施例における条件式の対応値の一覧を示す。 In addition, a list of corresponding values of the conditional expressions in each of these examples is shown.
[条件式対応値]
[条件式対応値]
条件式／実施例 1 2 3 4
(1) ０．８０＜ｆ１１／ｆ１２＜１４．００ 5.90 1.00 2.75 1.31
(2) −０．７５＜ｆ１／ｆ１１＜−０．０２ -0.12 -0.40 -0.19 -0.37
(3) ０．４５＜ｆｒｔ／ｆｔ 0.56 3.44 1.17 1.84
[Values for conditional expressions]
[Values for conditional expressions]
Conditional expression / Example 1 2 3 4
(1) 0.80 <f11 / f12 <14.00 5.90 1.00 2.75 1.31
(2) -0.75 <f1 / f11 <-0.02 -0.12 -0.40 -0.19 -0.37
(3) 0.45 <frt / ft 0.56 3.44 1.17 1.84
Ｇ１ 第１レンズ群
Ｇ２ 第２レンズ群
Ｇ３ 第３レンズ群
Ｇ４ 第４レンズ群
Ｇ１１ 第１１レンズ群
Ｇ１２ 第１２レンズ群
Ｇ１３ 第１３レンズ群
Ｓ 開口絞り
Ｉ 像面
G1 1st lens group G2 2nd lens group G3 3rd lens group G4 4th lens group G11 11th lens group G12 12th lens group G13 13th lens group S Aperture stop I Image surface
Claims (1)
（１） ０．９０＜ｆ１１／ｆ１２＜１４．００
（２） −０．７５＜ｆ１／ｆ１１＜−０．０２
（３） ０．４５＜ｆｒｔ／ｆｔ
ただし、
ｆ１１：前記第１１レンズ群の焦点距離
ｆ１２：前記第１２レンズ群の焦点距離
ｆ１ ：前記第１レンズ群の焦点距離
ｆｒｔ：前記第２レンズ群から最終群までの望遠端での合成焦点距離
ｆｔ ：望遠端におけるズームレンズ全系の焦点距離 A first lens unit having a positive power in order from the object side and fixed at the time of zooming, and a second lens unit and subsequent lenses are a zooming lens unit composed of two lens units that move at the time of zooming, an aperture stop, and a positive lens unit. consists of a relay lens group fixed upon zooming has power, said first lens group, have a negative power in order from the object side, comprises a first lens subunit that Do a single lens, a negative power A twelfth lens group and a thirteenth lens group having a positive power; focusing the lens on a short distance by extending the twelve lens group toward the object side; and telephoto from the second lens group to the final group A zoom lens that satisfies the following conditional expression when the combined focal length at the end is satisfied.
(1) 0. 9 0 <f11 / f12 <14.00
(2) -0.75 <f1 / f11 <-0.02
(3) 0.45 <frt / ft
However,
f11: focal length of the eleventh lens group f12: focal length of the twelfth lens group f1: focal length of the first lens group
frt: Composite focal length at the telephoto end from the second lens group to the final group
ft : focal length of the entire zoom lens at the telephoto end
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| CN112649952A (en) * | 2020-12-30 | 2021-04-13 | 广东奥普特科技股份有限公司 | High-resolution large-view-field industrial lens |
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| KR20090126817A (en) * | 2008-06-05 | 2009-12-09 | 삼성디지털이미징 주식회사 | Telescopic zoon lens |
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