JP2013101238A - Zoom lens and imaging apparatus including the same - Google Patents
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Abstract
Description
本発明はデジタルスチルカメラ、ビデオカメラ等に好適な小型で高ズーム比のズームレンズに関する。特に非撮影時に撮影装置全体の小型化が容易な携帯性に優れたズームレンズに関する。 The present invention relates to a compact zoom lens having a high zoom ratio suitable for a digital still camera, a video camera, or the like. In particular, the present invention relates to a zoom lens excellent in portability in which the entire photographing apparatus can be easily downsized when not photographing.
最近、撮像装置に用いられる撮影光学系は、高ズーム比で、全体が小型であることが求められており、特にカメラに適用したときカメラの厚みを薄くできるズームレンズであることが求められている。カメラの小型化とズームレンズの高ズーム比化を図るため、非撮影時に各レンズ群の間隔を撮影状態と異なる間隔まで縮小してカメラ筐体内に収納する、所謂沈胴式のズームレンズが知られている。またカメラの厚みを薄くするために、撮影光学系の光軸を９０°折り曲げる反射部材を光路中に配置した、所謂屈曲式のズームレンズが知られている（特許文献１）。 Recently, a photographing optical system used in an image pickup apparatus is required to have a high zoom ratio and to be small overall, and in particular, to be a zoom lens that can reduce the thickness of the camera when applied to a camera. Yes. In order to reduce the size of the camera and increase the zoom ratio of the zoom lens, a so-called collapsible zoom lens is known in which the distance between the lens groups is reduced to a different distance from the shooting state and stored in the camera case when not shooting. ing. In order to reduce the thickness of the camera, a so-called bending zoom lens is known in which a reflecting member that bends the optical axis of the photographing optical system by 90 ° is disposed in the optical path (Patent Document 1).
特許文献１では物体側より像側へ順に、正、負、正、正の屈折力の第１乃至第４レンズ群からなり第２レンズ群と第３レンズ群の間に折り曲げ用の反射部材を配したズーム比６程度のズームレンズを開示している。 In Patent Document 1, in order from the object side to the image side, a reflecting member for bending is formed between the second lens group and the third lens group, which includes first to fourth lens groups having positive, negative, positive, and positive refractive powers. A zoom lens having a zoom ratio of about 6 is disclosed.
また沈胴式の屈曲式の両方式を複合した方式として、非撮影時には反射部材が移動し、反射部材が移動することによって生じた空間に、反射部材の物体側に位置するレンズ群を沈胴収納するようにした、所謂屈曲沈胴式のズームレンズが知られている（特許文献２）。特許文献２では物体側から像側へ順に、正、負、正、正、負、正の屈折力の第１乃至第６レンズ群からなり、第３レンズ群に光路を略９０度に折り曲げる反射部材を配したズーム比１０程度のズームレンズを開示している。 In addition, as a method combining both the retractable and bent types, the reflecting member moves during non-photographing, and the lens group located on the object side of the reflecting member is retracted and accommodated in the space created by the moving reflecting member. A so-called bent-collapse zoom lens is known (Patent Document 2). In Patent Document 2, in order from the object side to the image side, the first to sixth lens groups having positive, negative, positive, positive, negative, and positive refractive powers are reflected, and the third lens group reflects the optical path by approximately 90 degrees. A zoom lens having a zoom ratio of about 10 with members disposed therein is disclosed.
撮影光学系の光路を折り曲げる反射部材を備えると共に沈胴式を利用したズームレンズであれば高ズーム比化が容易で、またカメラに適用したときカメラの厚みを薄くすることが容易になる。しかしながら、これらの効果を得るためにはズームレンズのレンズ構成を適切に設定し、かつ反射部材の光路中の配置等を適切に設定することが重要になってくる。例えば、レンズ群の数、各レンズ群の屈折力配置、ズーミングの際の各レンズ群の移動条件等のレンズ構成や反射部材を光路中に配置するときの位置等を適切に設定することが重要になってくる。これらの構成が適切でないと、上記の効果を得ることが難しい。 A zoom lens that includes a reflecting member that bends the optical path of the photographic optical system and uses a retractable lens can easily achieve a high zoom ratio, and when applied to a camera, it is easy to reduce the thickness of the camera. However, in order to obtain these effects, it is important to appropriately set the lens configuration of the zoom lens and appropriately set the arrangement of the reflecting member in the optical path. For example, it is important to appropriately set the number of lens groups, the refractive power arrangement of each lens group, the lens configuration such as the moving condition of each lens group during zooming, and the position when the reflecting member is arranged in the optical path. It becomes. If these configurations are not appropriate, it is difficult to obtain the above effects.
特許文献１では第２レンズ群と第３レンズ群の間に反射部材を配した広角端における撮影半画角が３３度程度、ズーム比６程度のズームレンズを開示している。また特許文献２では第３レンズ群に反射部材を配した、広角端における撮影半画角４０度程度、ズーム比１０程度のズームレンズを開示している。特許文献１、２のズームレンズにおいて更に高ズーム比化を図ろうとすると変倍用のレンズ群の移動量が増大し、また前玉有効径も増大し、レンズ径全体が大型化する傾向となる。 Patent Document 1 discloses a zoom lens in which a reflection member is disposed between the second lens group and the third lens group, the photographing half angle of view at the wide angle end is about 33 degrees, and the zoom ratio is about 6. Patent Document 2 discloses a zoom lens in which a third lens group is provided with a reflecting member and has a shooting half angle of view of about 40 degrees at the wide angle end and a zoom ratio of about 10. If an attempt is made to further increase the zoom ratio in the zoom lenses disclosed in Patent Documents 1 and 2, the amount of movement of the lens group for zooming increases, the effective diameter of the front lens also increases, and the overall lens diameter tends to increase. .
例えばズーム比１５〜２０程度の高ズーム比化を図ろうとすると、反射部材よりも物体側の各レンズ群のズーミングに際しての移動量が増大し、レンズ系全体が大型化してくる傾向がある。 For example, if a high zoom ratio of about 15 to 20 is to be achieved, the amount of movement of each lens unit on the object side relative to the reflecting member during zooming tends to increase, and the entire lens system tends to increase in size.
本発明は、高ズーム比で良好なる画像を容易に得ることができ、しかもカメラに適用したときカメラ等の厚みを薄くすることができるズームレンズ及びそれを用いた撮像装置を提供することを目的とする。 An object of the present invention is to provide a zoom lens capable of easily obtaining a good image at a high zoom ratio and reducing the thickness of the camera or the like when applied to a camera, and an imaging apparatus using the zoom lens. And
本発明のズームレンズは、物体側から像側へ順に、正の屈折力の第１レンズ群、負の屈折力の第２レンズ群、光路を折り曲げる反射部材を含む第３レンズ群、複数のレンズ群よりなる後続レンズ群からなり、
前記後続レンズ群は、物体側から像側へ順に、負の屈折力の第Ｎレンズ群、正の屈折力の第Ｐ１レンズ群、正の屈折力の第Ｐ２レンズ群を有し、前記第Ｎレンズ群は負レンズと正レンズよりなり、ズーミングに際して前記第１レンズ群、前記第２レンズ群、前記第Ｐ１レンズ群、前記第Ｐ２レンズ群が移動し、
前記第３レンズ群はズーミングにためには不動であり、前記第１レンズ群の焦点距離をｆ１、望遠端における全系の焦点距離をｆｔとするとき、
０．２＜ｆ１／ｆｔ＜０．５
なる条件を満足することを特徴としている。
The zoom lens according to the present invention includes, in order from the object side to the image side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group including a reflecting member that bends an optical path, and a plurality of lenses. It consists of a subsequent lens group consisting of a group,
The succeeding lens group includes, in order from the object side to the image side, an Nth lens group having a negative refractive power, a P1 lens group having a positive refractive power, and a P2 lens group having a positive refractive power. The lens group includes a negative lens and a positive lens, and the first lens group, the second lens group, the P1 lens group, and the P2 lens group move during zooming,
The third lens group does not move for zooming. When the focal length of the first lens group is f1, and the focal length of the entire system at the telephoto end is ft,
0.2 <f1 / ft <0.5
It is characterized by satisfying the following conditions.
本発明によれば、高ズーム比で良好なる画像を容易に得ることができ、しかもカメラに適用したときカメラ等の厚みを薄くすることができるズームレンズが得られる。 According to the present invention, it is possible to obtain a zoom lens capable of easily obtaining a good image with a high zoom ratio and reducing the thickness of the camera or the like when applied to the camera.
以下に、本発明の好ましい実施の形態を、添付の図面に基づいて説明する。本発明のズームレンズは、物体側から像側へ順に、正の屈折力の第１レンズ群、負の屈折力の第２レンズ群、光路を折り曲げる反射プリズムや反射ミラー等からなる反射部材を含む第３レンズ群、複数のレンズ群よりなる後続レンズ群からなる。 Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. The zoom lens according to the present invention includes, in order from the object side to the image side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a reflecting member including a reflecting prism or a reflecting mirror that bends the optical path. The third lens group includes a subsequent lens group including a plurality of lens groups.
後続レンズ群は、物体側から像側へ順に、負の屈折力の第Ｎレンズ群、正の屈折力の第Ｐ１レンズ群、正の屈折力の第Ｐ２レンズ群を有している。そして第Ｎレンズ群は負レンズと正レンズよりなる。ズーミングに際して第１レンズ群、第２レンズ群、第Ｐ１レンズ群、第Ｐ２レンズ群が移動し、第３レンズ群はズーミングにためには不動である。 The subsequent lens group includes, in order from the object side to the image side, an Nth lens group having a negative refractive power, a P1 lens group having a positive refractive power, and a P2 lens group having a positive refractive power. The Nth lens group includes a negative lens and a positive lens. During zooming, the first lens group, the second lens group, the P1 lens group, and the P2 lens group move, and the third lens group does not move for zooming.
図１（Ａ）、（Ｂ）、（Ｃ）は本発明の実施例１のズームレンズの光路を展開したときの広角端（短焦点距離端）、中間のズーム位置、望遠端（長焦点距離端）におけるレンズ断面図である。図２（Ａ）、（Ｂ）、（Ｃ）はそれぞれ実施例１のズームレンズの広角端、中間のズーム位置、望遠端における収差図である。実施例１はズーム比１８．９９、Ｆナンバー３．６７〜６．０７である。 1A, 1B, and 1C show the wide-angle end (short focal length end), the intermediate zoom position, and the telephoto end (long focal length) when the optical path of the zoom lens according to the first embodiment of the present invention is developed. It is lens sectional drawing in an end. 2A, 2B, and 2C are aberration diagrams at the wide-angle end, the intermediate zoom position, and the telephoto end, respectively, of the zoom lens of Example 1. FIGS. Example 1 has a zoom ratio of 18.99 and an F number of 3.67 to 6.07.
図３（Ａ）、（Ｂ）、（Ｃ）は本発明の実施例２のズームレンズの光路を展開したときの広角端、中間のズーム位置、望遠端におけるレンズ断面図である。図４（Ａ）、（Ｂ）、（Ｃ）はそれぞれ実施例２のズームレンズの広角端、中間のズーム位置、望遠端における収差図である。実施例２はズーム比１９．０３、Ｆナンバー３．６５〜６．０７である。 3A, 3B, and 3C are lens cross-sectional views at the wide-angle end, the intermediate zoom position, and the telephoto end when the optical path of the zoom lens according to Embodiment 2 of the present invention is developed. 4A, 4B, and 4C are aberration diagrams at the wide-angle end, the intermediate zoom position, and the telephoto end, respectively, of the zoom lens according to the second embodiment. In Example 2, the zoom ratio is 19.03 and the F number is 3.65 to 6.07.
図５（Ａ）、（Ｂ）、（Ｃ）は本発明の実施例３のズームレンズの光路を展開したときの広角端、中間のズーム位置、望遠端におけるレンズ断面図である。図６（Ａ）、（Ｂ）、（Ｃ）はそれぞれ実施例３のズームレンズの広角端、中間のズーム位置、望遠端における収差図である。実施例３はズーム比１８．９７、Ｆナンバー２．９４〜６．０７である。 5A, 5B, and 5C are lens cross-sectional views at the wide-angle end, the intermediate zoom position, and the telephoto end when the optical path of the zoom lens according to Embodiment 3 of the present invention is developed. FIGS. 6A, 6B, and 6C are aberration diagrams at the wide-angle end, the intermediate zoom position, and the telephoto end, respectively, of the zoom lens according to the third exemplary embodiment. In Example 3, the zoom ratio is 18.97 and the F number is 2.94 to 6.07.
図７（Ａ）、（Ｂ）、（Ｃ）は本発明の実施例４のズームレンズの光路を展開したときの広角端、中間のズーム位置、望遠端におけるレンズ断面図である。図８（Ａ）、（Ｂ）、（Ｃ）はそれぞれ実施例４のズームレンズの広角端、中間のズーム位置、望遠端における収差図である。実施例４はズーム比１８．９８、Ｆナンバー３．７５〜６．０７である。 7A, 7B, and 7C are lens cross-sectional views at the wide-angle end, the intermediate zoom position, and the telephoto end when the optical path of the zoom lens according to Embodiment 4 of the present invention is developed. 8A, 8B, and 8C are aberration diagrams at the wide-angle end, the intermediate zoom position, and the telephoto end, respectively, of the zoom lens according to the fourth exemplary embodiment. In Example 4, the zoom ratio is 18.98 and the F number is 3.75 to 6.07.
図９（Ａ）、（Ｂ）、（Ｃ）は本発明の実施例５のズームレンズの光路を展開したときの広角端、中間のズーム位置、望遠端におけるレンズ断面図である。図１０（Ａ）、（Ｂ）、（Ｃ）はそれぞれ実施例５のズームレンズの広角端、中間のズーム位置、望遠端における収差図である。実施例５はズーム比１８．９９、Ｆナンバー３．６６〜６．０７である。 FIGS. 9A, 9B, and 9C are lens cross-sectional views at the wide-angle end, the intermediate zoom position, and the telephoto end when the optical path of the zoom lens according to Embodiment 5 of the present invention is developed. FIGS. 10A, 10B, and 10C are aberration diagrams of the zoom lens of Example 5 at the wide-angle end, the intermediate zoom position, and the telephoto end, respectively. In Example 5, the zoom ratio is 18.99, and the F number is 3.66 to 6.07.
図１１（Ａ）、（Ｂ）、（Ｃ）は本発明の実施例６のズームレンズの光路を展開したときの広角端、中間のズーム位置、望遠端におけるレンズ断面図である。図１２（Ａ）、（Ｂ）、（Ｃ）はそれぞれ実施例６のズームレンズの広角端、中間のズーム位置、望遠端における収差図である。実施例６はズーム比２３．６４、Ｆナンバー３．７５〜６．８９である。 FIGS. 11A, 11B, and 11C are lens cross-sectional views at the wide-angle end, the intermediate zoom position, and the telephoto end when the optical path of the zoom lens according to the sixth exemplary embodiment of the present invention is developed. 12A, 12B, and 12C are aberration diagrams at the wide-angle end, the intermediate zoom position, and the telephoto end of the zoom lens according to Embodiment 6, respectively. In Example 6, the zoom ratio is 23.64 and the F number is 3.75 to 6.89.
図１３（Ｗ）、（Ｔ）は実施例１のズームレンズの広角端と望遠端において反射部材で光軸を折り曲げた撮影状態の説明図である。図１４は本発明のズームレンズをカメラ本体に収納したときの収納状態（沈胴状態）（非撮影時）の説明図である。図１５は本発明のズームレンズを備えるデジタルカメラ（撮像装置）の要部概略図である。 FIGS. 13W and 13T are explanatory views of a photographing state in which the optical axis is bent by a reflecting member at the wide-angle end and the telephoto end of the zoom lens according to the first exemplary embodiment. FIG. 14 is an explanatory diagram of a storage state (collapsed state) (when not photographing) when the zoom lens of the present invention is stored in the camera body. FIG. 15 is a schematic diagram of a main part of a digital camera (image pickup apparatus) including the zoom lens according to the present invention.
各実施例のズームレンズは撮像装置に用いられる撮影光学系であり、光路を展開したレンズ断面図において、左方が物体側（前方）で、右方が像側（後方）である。尚、各実施例のズームレンズをプロジェクター等の投射レンズとして用いるときは、光路を展開したレンズ断面図において、左方がスクリーン、右方が被投射画像となる。レンズ断面図において、ｉは物体側からのレンズ群の順番を示し、Ｌｉは第ｉレンズ群である。ＬＲは複数のレンズ群を含む後続レンズ群である。ＳＰは絞りである。 The zoom lens according to each embodiment is a photographing optical system used in the imaging apparatus. In the lens cross-sectional view in which the optical path is developed, the left side is the object side (front) and the right side is the image side (rear). When the zoom lens of each embodiment is used as a projection lens such as a projector, the left side is the screen and the right side is the projected image in the lens cross-sectional view in which the optical path is developed. In the lens cross-sectional view, i indicates the order of the lens groups from the object side, and Li is the i-th lens group. LR is a subsequent lens group including a plurality of lens groups. SP is an aperture.
ＰＲは光学系の光軸を９０度（９０度±１０度以内）折り曲げる反射面を含む反射プリズムや反射ミラー等からなる反射部材である。矢印は広角端から望遠端へのズーミングにおける各レンズ群の移動軌跡を示している。収差図において、ＦｎｏはＦナンバー、ωは撮影半画角（度）である。球面収差図において実線はｄ線、２点鎖線はｇ線である。非点収差図において実線はｄ線のサジタル像面、点線はｄ線のメリディオナル像面である。倍率色収差はｇ線によって表している。 PR is a reflecting member composed of a reflecting prism, a reflecting mirror, and the like including a reflecting surface that bends the optical axis of the optical system by 90 degrees (within 90 degrees ± 10 degrees). The arrows indicate the movement trajectory of each lens unit during zooming from the wide-angle end to the telephoto end. In the aberration diagrams, Fno is the F number, and ω is the shooting half angle of view (degrees). In the spherical aberration diagram, the solid line is the d line, and the two-dot chain line is the g line. In the astigmatism diagram, the solid line is the d-line sagittal image plane, and the dotted line is the d-line meridional image plane. Lateral chromatic aberration is represented by the g-line.
レンズ断面図において、Ｌ１は正の屈折力（光学的パワー＝焦点距離の逆数）の第１レンズ群である。Ｌ２は負の屈折力の第２レンズ群である。Ｌ３は光路を折り曲げる反射部材ＰＲを有する負の屈折力の第３レンズ群である。ＬＲは複数のレンズ群を有する後続レンズ群である。後続レンズ群ＬＲは正の屈折力の第４レンズ群Ｌ４、負の屈折力の第５レンズ群Ｌ５、正の屈折力の第６レンズ群Ｌ６、正の屈折力の第７レンズ群Ｌ７より成っている。図５の実施例３では、更に正の屈折力の第８レンズ群Ｌ８を有している。 In the lens cross-sectional view, L1 is a first lens unit having a positive refractive power (optical power = reciprocal of focal length). L2 is a second lens unit having a negative refractive power. L3 is a third lens unit having a negative refractive power and having a reflecting member PR that bends the optical path. LR is a subsequent lens group having a plurality of lens groups. The succeeding lens unit LR includes a fourth lens unit L4 having a positive refractive power, a fifth lens unit L5 having a negative refractive power, a sixth lens unit L6 having a positive refractive power, and a seventh lens unit L7 having a positive refractive power. ing. In Example 3 of FIG. 5, the eighth lens unit L8 having a positive refractive power is further provided.
各実施例では第５レンズ群が第Ｎレンズ群に、第６レンズ群が第Ｐ１レンズ群に、第７レンズ群が第Ｐ２レンズ群に相当している。 In each embodiment, the fifth lens group corresponds to the Nth lens group, the sixth lens group corresponds to the P1 lens group, and the seventh lens group corresponds to the P2 lens group.
反射部材ＰＲは反射面ＰＲａを含む反射プリズムよりなり、第３レンズ群Ｌ３に含まれており、光軸上の光線を入射方向に対し９０度反射させている。ＳＰは開口絞りであり、第４レンズ群Ｌ４に配置されている。ＧＢは光学フィルター、フェースプレート等に相当する光学ブロックである。ＩＰは像面であり、ビデオカメラやデジタルカメラの撮影光学系として使用する際にはＣＣＤセンサやＣＭＯＳセンサ等の固体撮像素子（光電変換素子）の撮像面に相当し、銀塩フィルム用カメラの撮像光学系として使用する際にはフィルム面に相当する。 The reflecting member PR is made of a reflecting prism including the reflecting surface PRa, is included in the third lens unit L3, and reflects light on the optical axis by 90 degrees with respect to the incident direction. SP is an aperture stop, which is disposed in the fourth lens unit L4. GB is an optical block corresponding to an optical filter, a face plate, or the like. IP is an image plane, which corresponds to an imaging plane of a solid-state imaging device (photoelectric conversion device) such as a CCD sensor or a CMOS sensor when used as a photographing optical system for a video camera or a digital camera. When used as an imaging optical system, it corresponds to a film surface.
広角端より望遠端へのズーミングに際し、第１レンズ群Ｌ１は物体側へ凸状の軌跡を描いて移動し、第２レンズ群Ｌ２は像側へ移動し、第３レンズ群Ｌ３は像面に対して固定である。第４レンズ群Ｌ４は物体側へ移動し、第５レンズ群Ｌ５は像面に対して固定されている。尚、第５レンズ群Ｌ５は必要に応じて移動しても良い。第６レンズ群Ｌ６は物体側へ移動し、第７レンズ群Ｌ７は物体側へ凸の軌跡を描いて移動する。 During zooming from the wide-angle end to the telephoto end, the first lens unit L1 moves along a locus convex toward the object side, the second lens unit L2 moves to the image side, and the third lens unit L3 moves to the image plane. It is fixed to it. The fourth lens unit L4 moves toward the object side, and the fifth lens unit L5 is fixed with respect to the image plane. The fifth lens unit L5 may be moved as necessary. The sixth lens unit L6 moves toward the object side, and the seventh lens unit L7 moves along a locus that is convex toward the object side.
図５の実施例３ではズーミングに際して第８レンズ群Ｌ８は不動である。このとき広角端に比べて望遠端において、第１レンズ群Ｌ１と第２レンズ群Ｌ２の間隔が増大し、第２レンズ群Ｌ２と第３レンズ群Ｌ３の間隔が減少し、第３レンズ群Ｌ３と第４レンズ群Ｌ４の間隔が減少する。また第４レンズ群Ｌ４と第５レンズ群Ｌ５の間隔が増大し、第５レンズ群Ｌ５と第６レンズ群Ｌ６の間隔が減少し、第６レンズ群Ｌ６と第７レンズ群Ｌ７の間隔は増大する。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７レンズ群は物体側に移動する。 In Example 3 of FIG. 5, the eighth lens unit L8 does not move during zooming. At this time, the distance between the first lens unit L1 and the second lens unit L2 is increased at the telephoto end compared to the wide-angle end, the interval between the second lens unit L2 and the third lens unit L3 is decreased, and the third lens unit L3. And the distance between the fourth lens unit L4 decreases. Further, the distance between the fourth lens group L4 and the fifth lens group L5 increases, the distance between the fifth lens group L5 and the sixth lens group L6 decreases, and the distance between the sixth lens group L6 and the seventh lens group L7 increases. To do. During focusing from an infinitely distant object to a close object, the seventh lens group moves to the object side.
各実施例のズームレンズは、撮影光学系内部に物体側からの光を折り曲げる反射部材ＰＲを含むことで、カメラの厚み方向を薄くすることを容易にしている。 The zoom lens of each embodiment includes a reflecting member PR that bends light from the object side inside the photographing optical system, thereby facilitating a reduction in the thickness direction of the camera.
各実施例では、第１レンズ群Ｌ１の屈折力を強くすることで、ズーミングの際の第１レンズ群Ｌ１の移動量を小さくして、カメラの厚みを薄くしている。さらに、撮影状態（図１３（Ｗ）、（Ｔ））から収納状態（図１４）へ移る際は、第３レンズ群Ｌ３乃至第７レンズ群Ｌ７が第１、第２レンズ群Ｌ１、Ｌ２の光軸に対し垂直方向で像側に移動する。更に第３レンズ群Ｌ３が移動することによって生じた空間に第１レンズ群Ｌ１及び第２レンズ群Ｌ２の少なくとも一部が沈胴収納されるようにしている。このような屈曲沈胴式のズームレンズを採用することによって、カメラの更なる薄型化を実現している。 In each embodiment, by increasing the refractive power of the first lens unit L1, the amount of movement of the first lens unit L1 during zooming is reduced, and the thickness of the camera is reduced. Further, when moving from the shooting state (FIGS. 13 (W) and (T)) to the storage state (FIG. 14), the third lens unit L3 to the seventh lens unit L7 are in the first and second lens units L1 and L2. Move to the image side in a direction perpendicular to the optical axis. Further, at least a part of the first lens unit L1 and the second lens unit L2 is retracted and accommodated in a space generated by the movement of the third lens unit L3. By adopting such a retractable zoom lens, the camera can be made thinner.
本実施例ではカメラの電源をｏｆｆし収納状態に移行する時に、反射部材ＰＲを含む第３レンズ群Ｌ３が像側の方向に退避し、その退避したスペースに第１レンズ群Ｌ１、第２レンズ群Ｌ２が沈胴して、収納される構成となっている。各実施例のズームレンズはズーム比２０程度の高ズーム比である。そして高ズーム比を確保しつつ、カメラに適用したときのカメラの厚み方向、及び横幅方向共にコンパクトに収納する為に、光路中に光路折り曲げ用の反射部材ＰＲを設け、反射部材ＰＲの前後における各レンズ群の変倍分担をバランス良く配置させている。 In this embodiment, when the camera power is turned off to shift to the storage state, the third lens unit L3 including the reflecting member PR is retracted in the image side direction, and the first lens unit L1 and the second lens are retracted in the retracted space. The group L2 is retracted and stored. The zoom lens of each embodiment has a high zoom ratio of about 20 zoom ratio. In order to store the camera in a compact manner in both the thickness direction and the width direction of the camera when applied to the camera while ensuring a high zoom ratio, a reflection member PR for bending the optical path is provided in the optical path, and before and after the reflection member PR. The variable magnification sharing of each lens group is arranged in a well-balanced manner.
特に反射部材ＰＲの物体側に配される正の屈折力の第１レンズ群Ｌ１と負の屈折力の第２レンズ群Ｌ２において、主変倍レンズ群となる第２レンズ群Ｌ２の変倍負担を適切に設定しつつ、前玉有効径の小型化を図っている。このとき、第２レンズ群Ｌ２に所望の変倍分担を担わせる為には、第１レンズ群Ｌ１の焦点距離を適切に設定する必要がある。 In particular, in the first lens unit L1 having a positive refractive power and the second lens unit L2 having a negative refractive power arranged on the object side of the reflecting member PR, a variable magnification burden of the second lens unit L2 serving as a main variable power lens unit. The effective diameter of the front lens is being reduced while appropriately setting. At this time, it is necessary to appropriately set the focal length of the first lens unit L1 in order to make the second lens unit L2 share the desired variable magnification.
そこで各実施例では、第１レンズ群Ｌ１の焦点距離をｆ１、望遠端における全系の焦点距離をｆｔとする。このとき、
０．２＜ｆ１／ｆｔ＜０．５ ・・・（１）
なる条件式を満足している。条件式（１）は第１レンズ群Ｌ１の焦点距離を望遠端における全系の焦点距離で規格化したものである。
Therefore, in each embodiment, the focal length of the first lens unit L1 is f1, and the focal length of the entire system at the telephoto end is ft. At this time,
0.2 <f1 / ft <0.5 (1)
The following conditional expression is satisfied. Conditional expression (1) is obtained by normalizing the focal length of the first lens unit L1 with the focal length of the entire system at the telephoto end.
主変倍レンズ群である第２レンズ群Ｌ２の変倍の負担は大きい。前玉有効径を小型に維持しつつ第２レンズ群Ｌ２に所望の変倍分担を担わせる為には、第１レンズ群Ｌ１の焦点距離を適切に設定する必要がある。条件式（１）の上限値を超えて第１レンズ群Ｌ１の焦点距離が大きくなりすぎると第２レンズ群Ｌ２で充分な変倍分担を得ることが困難になる。この結果、所望の変倍比を得る為に反射部材ＰＲより像側のレンズ群の負担が大きくなり、カメラの横幅が大型化してくるので良くない。 The burden of zooming on the second lens unit L2, which is the main zooming lens unit, is large. In order to allow the second lens unit L2 to share a desired variable magnification while maintaining the effective diameter of the front lens small, it is necessary to appropriately set the focal length of the first lens unit L1. If the upper limit of conditional expression (1) is exceeded and the focal length of the first lens unit L1 becomes too large, it will be difficult to obtain sufficient variable magnification sharing in the second lens unit L2. As a result, in order to obtain a desired zoom ratio, the burden on the lens group on the image side relative to the reflecting member PR is increased, and the lateral width of the camera is increased, which is not good.
条件式（１）の下限値を超えて第１レンズ群Ｌ１の焦点距離が小さくなりすぎると、第１レンズ群Ｌ１と第２レンズ群Ｌ２の偏心敏感度が増大し、レンズの組み付けに際して片ボケが増大し良好な性能を確保する事が困難となってくる。 If the lower limit of conditional expression (1) is exceeded and the focal length of the first lens unit L1 becomes too small, the decentering sensitivity of the first lens unit L1 and the second lens unit L2 increases, and one-sided blurring occurs when the lens is assembled. It becomes difficult to secure good performance.
以上のように第１レンズ群Ｌ１の焦点距離を条件式（１）を満足するように適切に設定する事により、第１レンズ群Ｌ１、第２レンズ群Ｌ２のズーミングに際しての移動量を少なく維持しつつも第２レンズ群Ｌ２に所望の変倍分担をさせている。更に好ましくは条件式（１）は次の如く設定するのが良い。 As described above, by appropriately setting the focal length of the first lens unit L1 so as to satisfy the conditional expression (1), the movement amount during zooming of the first lens unit L1 and the second lens unit L2 is kept small. However, the second lens unit L2 is made to share the desired variable magnification. More preferably, conditional expression (1) should be set as follows.
０．２３＜ｆ１／ｆｔ＜０．４０ ・・・（１ａ）
この様に第１レンズ群Ｌ１、第２レンズ群Ｌ２のズーミングに際しての移動量を少なくする事によって、沈胴収納時には少ない沈胴段数で、反射部材を含む第３レンズ群Ｌ３が退避したスペースに第１レンズ群Ｌ１、第２レンズ群Ｌ２の一部を沈胴させている。
0.23 <f1 / ft <0.40 (1a)
In this way, by reducing the amount of movement of the first lens unit L1 and the second lens unit L2 during zooming, the first lens unit L3 including the reflecting member is retracted with a small number of retracting steps when retracted. Part of the lens unit L1 and the second lens unit L2 is retracted.
上記構成により携帯時のカメラの厚み方向をコンパクトにしている。光路折り曲げ用の反射部材の像側は正の屈折力の第４レンズ群Ｌ４、負の屈折力の第５レンズ群Ｌ５、正の屈折力の第６レンズ群Ｌ６、正の屈折力の第７レンズ群Ｌ７を配している。これにより、反射部材ＰＲの外径及び反射部材ＰＲから像面までの長さをコンパクトに維持しつつも所望の変倍を効果的に得ている。 With the above configuration, the thickness direction of the camera when carried is made compact. The image side of the reflecting member for bending the optical path is a fourth lens unit L4 having a positive refractive power, a fifth lens unit L5 having a negative refractive power, a sixth lens unit L6 having a positive refractive power, and a seventh lens unit having a positive refractive power. A lens unit L7 is arranged. As a result, the desired variable magnification is effectively obtained while maintaining the outer diameter of the reflecting member PR and the length from the reflecting member PR to the image plane compact.
第４レンズ群Ｌ４は開口絞りＳＰを含み、広角端より望遠端へのズーミングに際して物体側へ移動し反射部材ＰＲよりも像側の主たる変倍分担を担う。第４レンズ群Ｌ４はズーミングに際しての移動量の絶対値が大きい。このとき、あまり大きな変倍分担を第４レンズ群Ｌ４に持たせるとズーミングに際しての移動量が増大する。そうすると、広角端における第３レンズ群Ｌ３と第４レンズ群Ｌ４の空気間隔が大きくなり、反射部材ＰＲが大型化してくる。 The fourth lens unit L4 includes an aperture stop SP, moves to the object side during zooming from the wide-angle end to the telephoto end, and is responsible for the main magnification change on the image side relative to the reflecting member PR. The fourth lens unit L4 has a large absolute value of the amount of movement during zooming. At this time, if the fourth lens unit L4 has a very large variable magnification share, the amount of movement during zooming increases. If it does so, the air space | interval of the 3rd lens group L3 and the 4th lens group L4 in a wide-angle end will become large, and the reflecting member PR will enlarge.
そこで、各実施例では負の屈折力の第５レンズ群（第Ｎレンズ群）Ｌ５の像側にズーミングに際して移動する正の屈折力の２つのレンズ群（第Ｐ１レンズ群と第Ｐ２レンズ群）を配置して変倍分担を分散させている。これによりレンズ径の増大を抑えると共に、反射部材ＰＲから像面までの長さを短く維持しつつ所望の変倍比が得られるようにしている。これらの構成においてはズーミング中の倍率色収差の変動を良好に補正する為に第５レンズ群Ｌ５は正レンズと負レンズで構成し色消しを行っている。 Therefore, in each embodiment, two lens groups having positive refractive power (the P1 lens group and the P2 lens group) moving during zooming to the image side of the fifth lens group (Nth lens group) L5 having negative refractive power. To distribute the variable magnification. As a result, an increase in the lens diameter is suppressed, and a desired zoom ratio is obtained while the length from the reflecting member PR to the image plane is kept short. In these configurations, the fifth lens unit L5 is constituted by a positive lens and a negative lens and is achromatic in order to satisfactorily correct fluctuations in lateral chromatic aberration during zooming.
以上の構成により所望の変倍比を有しつつカメラの厚み方向及び横幅方向共にコンパクトにしている。次に各実施例における更に好ましい構成について説明する。 With the above configuration, both the thickness direction and the width direction of the camera are made compact while having a desired zoom ratio. Next, a more preferable configuration in each embodiment will be described.
物体側から像側へ順に、後続レンズ群ＬＲが正の屈折力の第４レンズ群Ｌ４、負の屈折力の第５レンズ群Ｌ５、正の屈折力の第６レンズ群Ｌ６、正の屈折力の第７レンズ群Ｌ７を有しているときは、次の諸条件のうち１以上を満足するのが良い。そして第５レンズ群Ｌ５は負レンズと正レンズよりなり、第５レンズ群Ｌ５の負レンズと正レンズの材料のアッベ数を各々ν５ｎ、ν５ｐとする。第５レンズ群Ｌ５の負レンズの焦点距離をｆ５ｎ、第５レンズ群Ｌ５の焦点距離をｆ５、広角端と望遠端における全系の焦点距離を各々ｆｗ、ｆｔとする。 In order from the object side to the image side, the subsequent lens unit LR includes a fourth lens unit L4 having a positive refractive power, a fifth lens unit L5 having a negative refractive power, a sixth lens unit L6 having a positive refractive power, and a positive refractive power. When the seventh lens unit L7 is included, it is preferable to satisfy one or more of the following conditions. The fifth lens unit L5 includes a negative lens and a positive lens, and the Abbe numbers of the negative lens and the positive lens of the fifth lens unit L5 are ν5n and ν5p, respectively. The focal length of the negative lens of the fifth lens unit L5 is f5n, the focal length of the fifth lens unit L5 is f5, and the focal lengths of the entire system at the wide-angle end and the telephoto end are fw and ft, respectively.
広角端から望遠端へのズーミングに際しての第ｉレンズ群の移動量をｍｉとする。ここでｉはｉ＝１、３乃至７である。移動量の符号は物体側への移動を正、像側への移動を負とする。 Let mi be the amount of movement of the i-th lens group during zooming from the wide-angle end to the telephoto end. Here, i is i = 1, 3 to 7. The sign of the amount of movement is positive for movement toward the object side and negative for movement toward the image side.
−５．０＜ｆ５／ｆｗ＜−２．０ ・・・（２）
０．３＜ｆ５ｎ／ｆ５＜１．１ ・・・（３）
１２＜ν５ｐ−ν５ｎ＜２８ ・・・（４）
０．６＜ｍ１／ｍ４＜１．１ ・・・（５）
０．５＜ｍ６／ｆｗ＜１．７ ・・・（６）
１．６＜ｍ４／（ｍ６−ｍ５）＜３．５・・・（７）
−１．３＜ｍ６／ｍ７＜−０．４ ・・・（８）
１５＜ｆｔ／ｆｗ＜３０ ・・・（９）
次に前述の各条件式の技術的意味について説明する。
−5.0 <f5 / fw <−2.0 (2)
0.3 <f5n / f5 <1.1 (3)
12 <ν5p−ν5n <28 (4)
0.6 <m1 / m4 <1.1 (5)
0.5 <m6 / fw <1.7 (6)
1.6 <m4 / (m6-m5) <3.5 (7)
−1.3 <m6 / m7 <−0.4 (8)
15 <ft / fw <30 (9)
Next, the technical meaning of each conditional expression will be described.
条件式（２）は第６レンズ群Ｌ６以降に所望の変倍分担を持たせる為、第５群レンズ群Ｌ５の焦点距離を適切に設定するためのものである。条件式（２）は第５レンズ群Ｌ５の焦点距離を広角端における全系の焦点距離で規格化している。条件式（２）の上限値を超えて第５レンズ群Ｌ５の焦点距離が短くなり過ぎると、第５レンズ群Ｌ５以降のレンズ群でのズーミングによる倍率色収差の変動を補正するのが困難となってくる。 Conditional expression (2) is for appropriately setting the focal length of the fifth lens unit L5 so that the sixth lens unit L6 and subsequent lenses have a desired variable magnification. Conditional expression (2) normalizes the focal length of the fifth lens unit L5 with the focal length of the entire system at the wide-angle end. If the upper limit of conditional expression (2) is exceeded and the focal length of the fifth lens unit L5 becomes too short, it will be difficult to correct variations in lateral chromatic aberration due to zooming in the lens units after the fifth lens unit L5. Come.
条件式（２）の下限値を超えて第５レンズ群Ｌ５の焦点距離が長くなり過ぎると、第５レンズ群Ｌ５以降のレンズに所望の変倍分担を持たせる事が難しくなり、第４レンズ群Ｌ４の変倍の負担が大きくなってくる。このため、反射部材ＰＲの有効径が増大し、レンズ系全体が大型化してくる。 If the lower limit of conditional expression (2) is exceeded and the focal length of the fifth lens unit L5 becomes too long, it becomes difficult to give the desired magnification sharing to the lenses after the fifth lens unit L5. The burden of zooming on the group L4 increases. For this reason, the effective diameter of the reflecting member PR is increased, and the entire lens system is enlarged.
条件式（３）、（４）はズーミングにおける倍率色収差の変動を良好に補正する為に第５レンズ群Ｌ５内の負レンズの焦点距離と、第５レンズ群Ｌ５内の負レンズと、正レンズの材料のアッベ数を適切に設定するためのものである。このうち条件式（３）は第５レンズ群Ｌ５内の負レンズの焦点距離を第５レンズ群Ｌ５の焦点距離で規格化している。条件式（３）の上限値を超えて負レンズの焦点距離が長くなりすぎると第５レンズ群Ｌ５より発生する色収差が増大する。この為、ズーミングに際して倍率色収差の変動を良好に補正する事が困難となってくる。 Conditional expressions (3) and (4) indicate the focal length of the negative lens in the fifth lens unit L5, the negative lens in the fifth lens unit L5, and the positive lens in order to satisfactorily correct the variation in lateral chromatic aberration during zooming. This is for appropriately setting the Abbe number of the material. Conditional expression (3) standardizes the focal length of the negative lens in the fifth lens unit L5 with the focal length of the fifth lens unit L5. When the upper limit of conditional expression (3) is exceeded and the focal length of the negative lens becomes too long, chromatic aberration generated from the fifth lens unit L5 increases. For this reason, it becomes difficult to satisfactorily correct the variation in lateral chromatic aberration during zooming.
条件式（３）の下限値を超えて負レンズの焦点距離が短くなりすぎると、第５レンズ群Ｌ５中の正レンズの焦点距離も短くなり第５レンズ群Ｌ５全体の厚みが増大する。この結果、反射部材ＰＲより像側のレンズ群の長さが増大してくるので良くない。 If the lower limit of conditional expression (3) is exceeded and the focal length of the negative lens becomes too short, the focal length of the positive lens in the fifth lens unit L5 also becomes short, and the thickness of the entire fifth lens unit L5 increases. As a result, the length of the lens group on the image side from the reflecting member PR increases, which is not good.
条件式（４）は第５レンズ群Ｌ５を構成する正レンズと負レンズの材料のアッベ数の差を特定している。条件式（４）の上限値を超えてアッベ数の差が大きくなりすぎる又は下限値を超えてアッベ数の差が小さくなりすぎると第５レンズ群Ｌ５で発生する倍率色収差の補正が困難となる。この為ズーミングによる倍率色収差の変動を補正する事が困難となってくる。 Conditional expression (4) specifies the difference between the Abbe numbers of the materials of the positive lens and the negative lens constituting the fifth lens unit L5. When the upper limit of conditional expression (4) is exceeded and the Abbe number difference is too large, or when the lower limit is exceeded and the Abbe number difference is too small, it is difficult to correct lateral chromatic aberration generated in the fifth lens unit L5. . For this reason, it becomes difficult to correct fluctuations in lateral chromatic aberration due to zooming.
条件式（５）、（６）は反射部材ＰＲの前後での変倍分担をバランス良く配置させる為に、第１レンズ群Ｌ１、第４レンズ群Ｌ４、第６レンズ群Ｌ６のズーミングに際しての移動量を適切に設定するためのものである。条件式（５）はズーミングに際しての第１レンズ群Ｌ１と第４レンズ群Ｌ４の移動量の比に関する。条件式（５）の上限値を超えて第４レンズ群Ｌ４の移動量に対して第１レンズ群Ｌ１の移動量が大きくなりすぎると第１レンズ群を沈胴させる為のメカ機構が複雑になってくる。このため沈胴時にカメラ厚の薄型化を図るのが困難になってくる。 Conditional expressions (5) and (6) are used to move the first lens unit L1, the fourth lens unit L4, and the sixth lens unit L6 during zooming in order to arrange the variable power distribution before and after the reflecting member PR in a balanced manner. This is to set the amount appropriately. Conditional expression (5) relates to the ratio of the amount of movement of the first lens unit L1 and the fourth lens unit L4 during zooming. If the amount of movement of the first lens unit L1 is too large with respect to the amount of movement of the fourth lens unit L4 exceeding the upper limit value of the conditional expression (5), the mechanical mechanism for retracting the first lens unit becomes complicated. Come. This makes it difficult to reduce the thickness of the camera when retracted.
条件式（５）の下限値を超えて第１レンズ群Ｌ１の移動量に対して第４レンズ群Ｌ４の移動量が大きくなりすぎると広角端において開口絞りを有する第４レンズ群Ｌ４と第３レンズ群の距離を大きくとらなければならない。この為、反射部材ＰＲの有効径が大きくなりレンズ系全体が大型化してくる。 If the amount of movement of the fourth lens unit L4 exceeds the amount of movement of the first lens unit L1 beyond the lower limit value of the conditional expression (5), the fourth lens unit L4 and the third lens unit having the aperture stop at the wide angle end. The distance between the lens groups must be large. For this reason, the effective diameter of the reflecting member PR is increased, and the entire lens system is enlarged.
条件式（６）は第６レンズ群Ｌ６のズーミングに際しての移動量を広角端における全系の焦点距離で規格化したものである。条件式（６）の上限値を超えて第６レンズ群Ｌ６の移動量が大きくなりすぎると、反射部材ＰＲから像面までの長さが長くなりカメラの横幅が大型化してくる。条件式（６）の下限値を超えて第６レンズ群Ｌ６の移動量が小さくなりすぎると所望の変倍を得る為、第２レンズ群Ｌ２、第４レンズ群Ｌ４の変倍負担が大きくなりレンズ系全体が大型化してくる。 Conditional expression (6) is obtained by normalizing the amount of movement of the sixth lens unit L6 during zooming with the focal length of the entire system at the wide-angle end. If the upper limit of conditional expression (6) is exceeded and the amount of movement of the sixth lens unit L6 becomes too large, the length from the reflecting member PR to the image plane becomes long, and the lateral width of the camera increases. If the lower limit of conditional expression (6) is exceeded and the amount of movement of the sixth lens unit L6 becomes too small, the desired zooming ratio is obtained, and the zooming burden on the second lens unit L2 and the fourth lens unit L4 increases. The entire lens system becomes larger.
以上のように条件式（５）、（６）を満足させることによって、所望の変倍を確保しつつレンズ系全体の小型化を達成している。 By satisfying conditional expressions (5) and (6) as described above, the entire lens system can be reduced in size while ensuring a desired zooming ratio.
特に各実施例のズームレンズでは広角端の撮影画角として３６°以上を確保している。そして第２レンズ群Ｌ２で所望の変倍比を得る為に第１レンズ群Ｌ１と第２レンズ群Ｌ２の間隔変化を十分確保しつつ、前玉有効径を抑える為に第１レンズ群Ｌ１と反射部材ＰＲの広角端での距離を短くしている。 In particular, in the zoom lens of each embodiment, a photographing field angle of 36 ° or more is secured at the wide angle end. Then, in order to obtain a desired zoom ratio in the second lens unit L2, the first lens unit L1 and the first lens unit L1 are suppressed in order to suppress the effective diameter of the front lens while ensuring a sufficient change in the distance between the first lens unit L1 and the second lens unit L2. The distance at the wide-angle end of the reflecting member PR is shortened.
条件式（７）、（８）は変倍比を全レンズ群で担いつつ反射部材ＰＲの有効径と長さの増大を抑える為にズーミングに際しての第３レンズ群Ｌ３乃至第７レンズ群Ｌ７の移動量を適切に設定することによって変倍分担を分散させるものである。条件式（７）は第４レンズ群Ｌ４と第３レンズ群Ｌ３のズーミングに際しての移動量の差を第６レンズ群Ｌ６と第５レンズ群Ｌ５のズーミングに際しての移動量の差で割ったものである。 Conditional expressions (7) and (8) are used for the third lens unit L3 to the seventh lens unit L7 during zooming in order to suppress an increase in the effective diameter and length of the reflecting member PR while maintaining the zoom ratio in all the lens units. By appropriately setting the movement amount, the variable power sharing is dispersed. Conditional expression (7) is obtained by dividing the difference in movement amount during zooming between the fourth lens unit L4 and the third lens unit L3 by the difference in movement amount during zooming between the sixth lens unit L6 and the fifth lens unit L5. is there.
条件式（７）の上限値を超えて、第４レンズ群Ｌ４のズーミングに際しての移動量が大きくなりすぎると広角端において開口絞りを有する第４レンズ群Ｌ４と反射部材ＰＲを含む第３レンズ群Ｌ３の距離を大きくとらなければならない。この結果、反射部材ＰＲの有効径が大きくなりレンズ系全体が大型化してくる。条件式（７）の下限値を超えて、第４レンズ群Ｌ４のズーミングに際しての移動量が小さくなりすぎると反射部材ＰＲより物体側の第２レンズ群Ｌ２の変倍負担が大きくなり前玉有効径が増大してくる。 If the amount of movement during zooming of the fourth lens unit L4 exceeds the upper limit value of conditional expression (7), the fourth lens unit L4 having an aperture stop at the wide angle end and the third lens unit including the reflecting member PR The distance of L3 must be taken large. As a result, the effective diameter of the reflecting member PR is increased and the entire lens system is enlarged. If the lower limit of conditional expression (7) is exceeded and the amount of movement of the fourth lens unit L4 during zooming becomes too small, the magnification burden on the second lens unit L2 on the object side with respect to the reflecting member PR increases and the front lens is effective. The diameter increases.
条件式（８）は第６レンズ群Ｌ６と第７レンズ群Ｌ７のズーミングに際しての移動量の比に関するものである。条件式（８）の上限値を超えて第６レンズ群Ｌ６の移動量が大きくなりすぎると、反射部材ＰＲから像面までの長さが長くなりカメラの横幅が大型化してくる。条件式（８）の下限値を超えて第６レンズ群Ｌ６の移動量が小さくなりすぎると所望の変倍を得る為、第２レンズ群Ｌ２と第４レンズ群Ｌ４の変倍負担が大きくなりレンズ系全体が大型化してくる。 Conditional expression (8) relates to the ratio of the amount of movement during zooming of the sixth lens unit L6 and the seventh lens unit L7. If the upper limit value of conditional expression (8) is exceeded and the amount of movement of the sixth lens unit L6 becomes too large, the length from the reflecting member PR to the image plane becomes long, and the lateral width of the camera becomes large. If the lower limit of conditional expression (8) is exceeded and the amount of movement of the sixth lens unit L6 becomes too small, the desired zooming ratio is obtained, and the zooming burden on the second lens unit L2 and the fourth lens unit L4 increases. The entire lens system becomes larger.
条件式（９）は望遠端における全系の焦点距離と広角端における全系の焦点距離の比に関し、所望の変倍比の範囲を示すものである。条件式（９）は条件式（７）、（８）と同時に満足させると好ましい。条件式（９）の上限値をこえて変倍比が大きくなりすぎると、レンズ系全体が大型化してくる。条件式（９）の下限値を超えて変倍比が小さくなると、高ズーム比化が困難となる。更に好ましくは、条件式（２）乃至（９）を次の如く設定するのが良い。 Conditional expression (9) indicates the range of the desired zoom ratio with respect to the ratio of the focal length of the entire system at the telephoto end to the focal length of the entire system at the wide-angle end. Conditional expression (9) is preferably satisfied simultaneously with conditional expressions (7) and (8). If the zoom ratio becomes too large beyond the upper limit value of conditional expression (9), the entire lens system becomes large. If the zoom ratio is reduced beyond the lower limit value of conditional expression (9), it is difficult to achieve a high zoom ratio. More preferably, conditional expressions (2) to (9) should be set as follows.
−４．５＜ｆ５／ｆｗ＜−２．５ ・・・（２ａ）
０．４＜ｆ５ｎ／ｆ５＜０．８ ・・・（３ａ）
１３＜ν５ｐ−ν５ｎ＜２５ ・・・（４ａ）
０．７＜ｍ１／ｍ４＜１．０ ・・・（５ａ）
０．７＜ｍ６／ｆｗ＜１．６ ・・・（６ａ）
１．７＜ｍ４／（ｍ６−ｍ５）＜３．０ ・・・（７ａ）
−１．２＜ｍ６／ｍ７＜−０．５ ・・・（８ａ）
１７＜ｆｔ／ｆｗ＜２６ ・・・（９ａ）
次に各実施例のレンズ構成について説明する。
−4.5 <f5 / fw <−2.5 (2a)
0.4 <f5n / f5 <0.8 (3a)
13 <ν5p−ν5n <25 (4a)
0.7 <m1 / m4 <1.0 (5a)
0.7 <m6 / fw <1.6 (6a)
1.7 <m4 / (m6-m5) <3.0 (7a)
-1.2 <m6 / m7 <-0.5 (8a)
17 <ft / fw <26 (9a)
Next, the lens configuration of each example will be described.
以下、物体側より像側へ次のとおりである。実施例１において、第１レンズ群Ｌ１は負レンズと正レンズの接合レンズ、正レンズの３つのレンズ、第２レンズ群Ｌ２は負レンズ、負レンズ、正レンズの３つのレンズ、第３レンズ群Ｌ３は反射部材ＰＲと負レンズよりなっている。 Hereinafter, the operation from the object side to the image side is as follows. In Example 1, the first lens group L1 is a cemented lens of a negative lens and a positive lens, three lenses of a positive lens, the second lens group L2 is a negative lens, a negative lens, three lenses of a positive lens, and a third lens group L3 includes a reflecting member PR and a negative lens.
第４レンズ群Ｌ４は正レンズ、開口絞り、像側の面が凹のメニスカス形状の負レンズ、両凸形状の正レンズと負レンズを接合した接合レンズの４つのレンズよりなっている。このとき、接合レンズを光軸と垂直方向の成分を持つようにシフトさせて手ぶれによる画像ぶれを補正している。第５レンズ群Ｌ５は負レンズと正レンズを接合した接合レンズからなり、第６レンズ群Ｌ６は正レンズからなり、第７レンズ群Ｌ７は両凸形状の正レンズと負レンズを接合した接合レンズからなる。 The fourth lens unit L4 includes four lenses: a positive lens, an aperture stop, a meniscus negative lens having a concave image side surface, and a cemented lens in which a biconvex positive lens and a negative lens are cemented. At this time, image blur due to camera shake is corrected by shifting the cemented lens so as to have a component perpendicular to the optical axis. The fifth lens unit L5 is composed of a cemented lens in which a negative lens and a positive lens are cemented, the sixth lens unit L6 is composed of a positive lens, and the seventh lens unit L7 is a cemented lens in which a biconvex positive lens and a negative lens are cemented. Consists of.
ズーミングに際して、第３レンズ群Ｌ３と第５レンズ群Ｌ５は像面に対して固定されている。実施例２、４乃至６においてレンズ構成、ズーミングにおける各レンズ群の移動、各レンズ群のレンズ構成は実施例１と同様である。実施例３は実施例１に比べて、第７レンズ群Ｌ７の像側に正の屈折力の第８レンズ群Ｌ８を有すること、第６レンズ群Ｌ６と第７レンズ群Ｌ７のレンズ構成が異なっている。第１レンズ群Ｌ１乃至第５レンズ群Ｌ５のレンズ構成、ズーミングにおける各レンズ群の移動軌跡等は実施例１と同じである。 During zooming, the third lens unit L3 and the fifth lens unit L5 are fixed with respect to the image plane. In Examples 2, 4 to 6, the lens configuration, the movement of each lens group during zooming, and the lens configuration of each lens group are the same as those in Example 1. The third embodiment has an eighth lens unit L8 having positive refractive power on the image side of the seventh lens unit L7, and the lens configurations of the sixth lens unit L6 and the seventh lens unit L7 are different from those of the first example. ing. The lens configurations of the first lens unit L1 to the fifth lens unit L5, the movement locus of each lens unit during zooming, and the like are the same as those in the first embodiment.
実施例３において、第６レンズ群Ｌ６は両凸形状の正レンズと負レンズを接合した接合レンズからなる。また第７レンズ群Ｌ７は両凸形状の単レンズからなり、第８レンズ群Ｌ８は１つの正レンズからなる。実施例１乃至６において無限遠物体から近距離物体へのフォーカスは第７レンズ群Ｌ７を物体側へ繰り出す事により行っている。フォーカシングを第２レンズ群Ｌ２、第５レンズ群Ｌ５、第６レンズ群Ｌ６、若しくは第４レンズ群Ｌ４の一部で行っても良い。 In Example 3, the sixth lens unit L6 includes a cemented lens in which a biconvex positive lens and a negative lens are cemented. The seventh lens unit L7 is composed of a biconvex single lens, and the eighth lens unit L8 is composed of one positive lens. In Examples 1 to 6, focusing from an infinitely distant object to a close object is performed by extending the seventh lens unit L7 toward the object side. Focusing may be performed on part of the second lens unit L2, the fifth lens unit L5, the sixth lens unit L6, or the fourth lens unit L4.
実施例１乃至６においては第３レンズ群Ｌ３の反射部材ＰＲで光路を折り曲げ、第４レンズ群Ｌ４以降のレンズ群の光軸はカメラボディ内の横方向に展開される構成を想定している。 In Examples 1 to 6, it is assumed that the optical path is bent by the reflecting member PR of the third lens unit L3, and the optical axes of the lens units after the fourth lens unit L4 are developed in the lateral direction in the camera body. .
以上のように、各実施例によれば広角端における撮影半画角が３６°程度以上の広画角を有しつつ、１５〜２５倍程度のズーム比を有しカメラの厚み方向と横幅方向共にコンパクトで携帯性に優れたズームレンズが得られる。 As described above, according to each embodiment, the photographing half angle of view at the wide angle end has a wide angle of view of about 36 ° or more, and has a zoom ratio of about 15 to 25 times, and has a thickness direction and a width direction of the camera. A zoom lens that is both compact and highly portable can be obtained.
次に本発明のズームレンズを撮影光学系として用いたデジタルカメラ（光学機器）の実施形態を図１５を用いて説明する。図１５において、２０はデジタルカメラ本体、２１は上述の実施例のズームレンズによって構成された撮影光学系である。ＰＲは反射部材（反射プリズム）である。撮影光学系２１は被写体の像をＣＣＤ等の固体撮像素子上（光電変換素子上）２２に形成している。２３は撮像素子２２が受光した被写体の像を記録する記録手段、２４は不図示の表示素子に表示された画像を観察するためのファインダーである。 Next, an embodiment of a digital camera (optical apparatus) using the zoom lens of the present invention as a photographing optical system will be described with reference to FIG. In FIG. 15, 20 is a digital camera body, and 21 is a photographing optical system constituted by the zoom lens of the above-described embodiment. PR is a reflecting member (reflecting prism). The photographing optical system 21 forms an image of a subject on a solid-state image pickup device (on a photoelectric conversion device) 22 such as a CCD. Reference numeral 23 denotes recording means for recording an image of a subject received by the image sensor 22, and reference numeral 24 denotes a finder for observing an image displayed on a display element (not shown).
上記表示素子は液晶パネル等によって構成され、撮像素子２２上に形成された画像が表示される。このように本発明のズームレンズをデジタルカメラ等に適用することにより、小型で高い光学性能を有する撮像装置を実現している。 The display element is composed of a liquid crystal panel or the like, and an image formed on the image sensor 22 is displayed. Thus, by applying the zoom lens of the present invention to a digital camera or the like, a small-sized image pickup apparatus having high optical performance is realized.
次に、本発明の各実施例に対応する数値実施例を示す。数値実施例において、ｉは物体側からの面の順序を示す。ｒｉはレンズ面の曲率半径、ｄｉは第ｉ面と第ｉ＋１面との間のレンズ肉厚および空気間隔である。ｎｄｉ、νｄｉはそれぞれｄ線に対する屈折率、アッベ数を表す。ｒ１２、ｒ１３は反射プリズムＰＲの光学面である。また、ｋ、Ａ４、Ａ６、Ａ８、Ａ１０、Ａ１２は非球面係数である。非球面形状は光軸からの高さｈの位置での光軸方向の変位を、面頂点を基準にしてｘとするとき以下の式で定義される。 Next, numerical examples corresponding to the respective embodiments of the present invention will be shown. In the numerical examples, i indicates the order of the surfaces from the object side. ri is the radius of curvature of the lens surface, and di is the lens thickness and the air spacing between the i-th surface and the (i + 1) -th surface. ndi and νdi represent the refractive index and Abbe number for the d-line, respectively. r12 and r13 are optical surfaces of the reflecting prism PR. K, A4, A6, A8, A10, and A12 are aspheric coefficients. The aspherical shape is defined by the following expression when the displacement in the optical axis direction at the position of the height h from the optical axis is x with respect to the surface vertex.
ｘ＝（ｈ2／Ｒ）／［１＋｛１−（１＋ｋ）（ｈ／Ｒ）2｝1/2］
＋A4ｈ4＋A6ｈ6＋A8ｈ8＋A10ｈ10＋A12ｈ12
但し、ここでＲは曲率半径である。又、前述の各条件式と各実施例との関係を表１に示す。
x = (h 2 / R) / [1+ {1− (1 + k) (h / R) 2 } 1/2 ]
+ A4h 4 + A6h 6 + A8h 8 + A10h 10 + A12h 12
Here, R is a radius of curvature. Table 1 shows the relationship between the above-described conditional expressions and the respective examples.
［数値実施例１］
単位 mm
面データ
面番号 r d nd νd
1 29.025 1.10 1.85478 24.8
2 18.526 4.20 1.49700 81.5
3 165.478 0.10
4 21.107 2.30 1.69680 55.5
5 98.086 (可変)
6 -111.165 0.50 1.84954 40.1
7* 6.305 3.68
8 -20.120 0.50 1.83481 42.7
9 37.197 0.09
10 18.431 2.10 1.95906 17.5
11 -43.500 (可変)
12 ∞ 8.00 1.83481 42.7
13 ∞ 0.84
14 -16.566 0.60 1.88300 40.8
15 -37.124 (可変)
16* 8.382 2.50 1.55332 71.7
17* -25.554 1.00
18(絞り) ∞ 0.00
19 ∞ 1.00
20 9.813 0.60 2.00069 25.5
21 6.796 1.59
22 27.707 2.50 1.48749 70.2
23 -11.397 0.50 1.88300 40.8
24 -20.659 (可変)
25 -31.923 0.50 1.88300 40.8
26 16.481 1.00 1.95906 17.5
27 25.798 (可変)
28* 21.298 1.30 1.55332 71.7
29 2981.040 (可変)
30* 18.670 2.30 1.74330 49.3
31 -24.469 0.40 2.00272 19.3
32 -50.650 (可変)
33 ∞ 0.80 1.51633 64.1
34 ∞ 1.80
像面 ∞
非球面データ
第7面
K =-3.41695e-001 A 4= 2.52255e-005 A 6=-2.61809e-006 A 8=-7.30747e-009 A10= 9.35342e-010 A12=-4.44237e-011
第16面
K =-1.80834e+000 A 4= 1.54618e-004 A 6=-6.59289e-007 A 8= 1.17724e-009
第17面
K =-8.37502e-001 A 4= 5.79250e-005 A 6=-2.19491e-008
第28面
K = 9.01266e-001 A 4=-3.98994e-005 A 6=-3.80944e-008
第30面
K =-8.78268e-001 A 4= 3.07582e-005 A 6=-2.50845e-007
各種データ
ズーム比 18.99
広角 中間 望遠
焦点距離 5.15 7.17 97.80
Fナンバー 3.67 3.89 6.07
半画角（度） 36.95 28.40 2.27
像高 3.88 3.88 3.88
レンズ全長 79.53 78.40 90.57
BF 11.28 10.93 3.62
d 5 0.70 1.64 17.54
d11 6.70 4.63 0.90
d15 13.72 10.94 0.80
d24 1.34 4.11 14.26
d27 5.81 4.37 1.03
d29 0.80 2.59 13.24
d32 8.96 8.61 1.30
ズームレンズ群データ
群 始面 焦点距離
1 1 30.62
2 6 -8.40
3 12 -34.35
4 16 13.70
5 25 -16.42
6 28 38.76
7 30 20.66
8 33 ∞
[Numerical Example 1]
Unit mm
Surface data surface number rd nd νd
1 29.025 1.10 1.85478 24.8
2 18.526 4.20 1.49700 81.5
3 165.478 0.10
4 21.107 2.30 1.69680 55.5
5 98.086 (variable)
6 -111.165 0.50 1.84954 40.1
7 * 6.305 3.68
8 -20.120 0.50 1.83481 42.7
9 37.197 0.09
10 18.431 2.10 1.95906 17.5
11 -43.500 (variable)
12 ∞ 8.00 1.83481 42.7
13 ∞ 0.84
14 -16.566 0.60 1.88300 40.8
15 -37.124 (variable)
16 * 8.382 2.50 1.55332 71.7
17 * -25.554 1.00
18 (Aperture) ∞ 0.00
19 ∞ 1.00
20 9.813 0.60 2.00069 25.5
21 6.796 1.59
22 27.707 2.50 1.48749 70.2
23 -11.397 0.50 1.88300 40.8
24 -20.659 (variable)
25 -31.923 0.50 1.88300 40.8
26 16.481 1.00 1.95906 17.5
27 25.798 (variable)
28 * 21.298 1.30 1.55332 71.7
29 2981.040 (variable)
30 * 18.670 2.30 1.74330 49.3
31 -24.469 0.40 2.00272 19.3
32 -50.650 (variable)
33 ∞ 0.80 1.51633 64.1
34 ∞ 1.80
Image plane ∞
Aspheric data 7th surface
K = -3.41695e-001 A 4 = 2.52255e-005 A 6 = -2.61809e-006 A 8 = -7.30747e-009 A10 = 9.35342e-010 A12 = -4.44237e-011
16th page
K = -1.80834e + 000 A 4 = 1.54618e-004 A 6 = -6.59289e-007 A 8 = 1.17724e-009
17th page
K = -8.37502e-001 A 4 = 5.79250e-005 A 6 = -2.19491e-008
28th page
K = 9.01266e-001 A 4 = -3.98994e-005 A 6 = -3.80944e-008
30th page
K = -8.78268e-001 A 4 = 3.07582e-005 A 6 = -2.50845e-007
Various data Zoom ratio 18.99
Wide angle Medium Telephoto focal length 5.15 7.17 97.80
F number 3.67 3.89 6.07
Half angle of view (degrees) 36.95 28.40 2.27
Image height 3.88 3.88 3.88
Total lens length 79.53 78.40 90.57
BF 11.28 10.93 3.62
d 5 0.70 1.64 17.54
d11 6.70 4.63 0.90
d15 13.72 10.94 0.80
d24 1.34 4.11 14.26
d27 5.81 4.37 1.03
d29 0.80 2.59 13.24
d32 8.96 8.61 1.30
Zoom lens group data group Start surface Focal length
1 1 30.62
2 6 -8.40
3 12 -34.35
4 16 13.70
5 25 -16.42
6 28 38.76
7 30 20.66
8 33 ∞
［数値実施例２］
単位 mm
面データ
面番号 r d nd νd
1 29.216 1.10 1.85478 24.8
2 18.382 4.50 1.49700 81.5
3 169.276 0.10
4 20.722 2.40 1.69680 55.5
5 90.419 (可変)
6 -93.045 0.50 1.84954 40.1
7* 5.864 3.68
8 -18.214 0.50 1.59282 68.6
9 35.315 0.09
10 18.232 2.30 1.95906 17.5
11 -59.144 (可変)
12 ∞ 8.00 1.83481 42.7
13 ∞ 0.84
14 -16.566 0.60 1.88300 40.8
15 -37.124 (可変)
16* 8.313 2.50 1.55332 71.7
17* -26.156 1.00
18(絞り) ∞ 0.00
19 ∞ 1.00
20 10.257 0.60 2.00330 28.3
21 6.899 1.56
22 22.721 2.50 1.48749 70.2
23 -12.147 0.50 2.00330 28.3
24 -20.506 (可変)
25 -36.118 0.50 1.88300 40.8
26 10.175 1.30 1.85478 24.8
27 23.838 (可変)
28* 19.118 1.30 1.55332 71.7
29 167.210 (可変)
30* 19.030 2.30 1.74330 49.3
31 -26.860 0.40 2.00272 19.3
32 -46.358 (可変)
33 ∞ 0.50 1.51633 64.1
34 ∞ 1.99
像面 ∞
非球面データ
第7面
K =-3.69593e-001 A 4=-6.13848e-005 A 6=-4.98232e-006 A 8=-1.35481e-008 A10= 1.09873e-009 A12=-6.65912e-011
第16面
K =-1.94758e+000 A 4= 2.09076e-004 A 6=-1.42158e-006 A 8= 8.33041e-010
第17面
K = 5.33799e-001 A 4= 8.72011e-005 A 6=-6.08488e-007
第28面
K = 5.01847e-001 A 4=-5.12721e-005 A 6= 6.07526e-008
第30面
K =-2.82238e-001 A 4= 1.77862e-005 A 6=-3.04446e-007
各種データ
ズーム比 19.03
広角 中間 望遠
焦点距離 5.14 7.46 97.80
Fナンバー 3.65 4.15 6.07
画角 37.01 27.45 2.27
像高 3.88 3.88 3.88
レンズ全長 80.05 79.32 91.33
BF 11.65 11.28 3.62
d 5 0.70 2.00 17.69
d11 6.61 4.59 0.90
d15 13.66 10.51 0.80
d24 1.21 4.37 14.08
d27 5.35 4.05 1.00
d29 0.80 2.47 13.18
d32 9.33 8.96 1.30
ズームレンズ群データ
群 始面 焦点距離
1 1 30.84
2 6 -8.60
3 12 -34.35
4 16 13.73
5 25 -15.62
6 28 38.89
7 30 19.89
8 33 ∞
[Numerical Example 2]
Unit mm
Surface data surface number rd nd νd
1 29.216 1.10 1.85478 24.8
2 18.382 4.50 1.49700 81.5
3 169.276 0.10
4 20.722 2.40 1.69680 55.5
5 90.419 (variable)
6 -93.045 0.50 1.84954 40.1
7 * 5.864 3.68
8 -18.214 0.50 1.59282 68.6
9 35.315 0.09
10 18.232 2.30 1.95906 17.5
11 -59.144 (variable)
12 ∞ 8.00 1.83481 42.7
13 ∞ 0.84
14 -16.566 0.60 1.88300 40.8
15 -37.124 (variable)
16 * 8.313 2.50 1.55332 71.7
17 * -26.156 1.00
18 (Aperture) ∞ 0.00
19 ∞ 1.00
20 10.257 0.60 2.00 330 28.3
21 6.899 1.56
22 22.721 2.50 1.48749 70.2
23 -12.147 0.50 2.00 330 28.3
24 -20.506 (variable)
25 -36.118 0.50 1.88300 40.8
26 10.175 1.30 1.85478 24.8
27 23.838 (variable)
28 * 19.118 1.30 1.55332 71.7
29 167.210 (variable)
30 * 19.030 2.30 1.74330 49.3
31 -26.860 0.40 2.00272 19.3
32 -46.358 (variable)
33 ∞ 0.50 1.51633 64.1
34 ∞ 1.99
Image plane ∞
Aspheric data 7th surface
K = -3.69593e-001 A 4 = -6.13848e-005 A 6 = -4.98232e-006 A 8 = -1.35481e-008 A10 = 1.09873e-009 A12 = -6.65912e-011
16th page
K = -1.94758e + 000 A 4 = 2.09076e-004 A 6 = -1.42158e-006 A 8 = 8.33041e-010
17th page
K = 5.33799e-001 A 4 = 8.72011e-005 A 6 = -6.08488e-007
28th page
K = 5.01847e-001 A 4 = -5.12721e-005 A 6 = 6.07526e-008
30th page
K = -2.82238e-001 A 4 = 1.77862e-005 A 6 = -3.04446e-007
Various data Zoom ratio 19.03
Wide angle Medium Telephoto focal length 5.14 7.46 97.80
F number 3.65 4.15 6.07
Angle of view 37.01 27.45 2.27
Image height 3.88 3.88 3.88
Total lens length 80.05 79.32 91.33
BF 11.65 11.28 3.62
d 5 0.70 2.00 17.69
d11 6.61 4.59 0.90
d15 13.66 10.51 0.80
d24 1.21 4.37 14.08
d27 5.35 4.05 1.00
d29 0.80 2.47 13.18
d32 9.33 8.96 1.30
Zoom lens group data group Start surface Focal length
1 1 30.84
2 6 -8.60
3 12 -34.35
4 16 13.73
5 25 -15.62
6 28 38.89
7 30 19.89
8 33 ∞
［数値実施例３］
単位 mm
面データ
面番号 r d nd νd
1 31.191 1.10 1.85478 24.8
2 18.246 4.28 1.49700 81.5
3 139.401 0.10
4 20.943 2.30 1.77250 49.6
5 102.345 (可変)
6 -201.900 1.05 1.84954 40.1
7* 6.012 3.68
8 -19.697 0.60 1.88300 40.8
9 25.426 0.09
10 17.372 2.21 1.94595 18.0
11 -31.838 (可変)
12 ∞ 8.00 1.83400 37.2
13 ∞ 0.84
14 -16.566 0.60 1.88300 40.8
15 -37.124 (可変)
16* 9.630 2.50 1.55332 71.7
17* -34.992 1.00
18(絞り) ∞ 1.00
19 9.487 0.60 1.91809 33.6
20 7.030 1.67
21 16.215 3.50 1.48749 70.2
22 -11.396 0.60 2.00330 28.3
23 -19.120 (可変)
24 -60.286 0.50 1.80400 46.6
25 6.349 1.00 1.80610 33.3
26 16.478 (可変)
27 20.220 1.70 1.49700 81.5
28 -43.977 0.50 1.85478 24.8
29 1094.596 (可変)
30* 14.397 2.60 1.55332 71.7
31 -58.458 (可変)
32 23.757 1.04 1.85478 24.8
33 44.813 2.00
34 ∞ 0.80 1.51633 64.1
35 ∞ 0.29
像面 ∞
非球面データ
第7面
K =-2.25214e-001 A 4=-4.08166e-005 A 6=-6.66455e-006 A 8= 6.05668e-008 A10= 8.50626e-010 A12=-9.00224e-011
第16面
K =-1.27172e+000 A 4= 8.73763e-005 A 6=-2.13428e-006 A 8=-5.69547e-008 A10= 7.22877e-010
第17面
K =-1.16189e+000 A 4= 7.03186e-005 A 6=-3.61622e-006
第30面
K = 0.00000e+000 A 4=-2.61725e-005
各種データ
ズーム比 18.97
広角 中間 望遠
焦点距離 5.15 8.86 97.80
Fナンバー 2.94 3.42 6.07
画角 36.94 23.63 2.27
像高 3.88 3.88 3.88
レンズ全長 89.13 89.47 99.60
BF 3.24 3.24 3.24
d 5 0.59 3.17 16.70
d11 6.53 4.29 0.90
d15 15.10 11.61 0.80
d23 0.87 4.36 15.18
d26 8.87 6.52 1.03
d29 4.00 8.91 18.96
d31 7.91 5.36 0.80
ズームレンズ群データ
群 始面 焦点距離
1 1 30.08
2 6 -7.85
3 12 -34.35
4 16 13.61
5 24 -16.01
6 27 62.83
7 30 21.15
8 32 57.83
9 34 ∞
[Numerical Example 3]
Unit mm
Surface data surface number rd nd νd
1 31.191 1.10 1.85478 24.8
2 18.246 4.28 1.49700 81.5
3 139.401 0.10
4 20.943 2.30 1.77250 49.6
5 102.345 (variable)
6 -201.900 1.05 1.84954 40.1
7 * 6.012 3.68
8 -19.697 0.60 1.88300 40.8
9 25.426 0.09
10 17.372 2.21 1.94595 18.0
11 -31.838 (variable)
12 ∞ 8.00 1.83400 37.2
13 ∞ 0.84
14 -16.566 0.60 1.88300 40.8
15 -37.124 (variable)
16 * 9.630 2.50 1.55332 71.7
17 * -34.992 1.00
18 (Aperture) ∞ 1.00
19 9.487 0.60 1.91809 33.6
20 7.030 1.67
21 16.215 3.50 1.48749 70.2
22 -11.396 0.60 2.00330 28.3
23 -19.120 (variable)
24 -60.286 0.50 1.80 400 46.6
25 6.349 1.00 1.80610 33.3
26 16.478 (variable)
27 20.220 1.70 1.49700 81.5
28 -43.977 0.50 1.85478 24.8
29 1094.596 (variable)
30 * 14.397 2.60 1.55332 71.7
31 -58.458 (variable)
32 23.757 1.04 1.85478 24.8
33 44.813 2.00
34 ∞ 0.80 1.51633 64.1
35 ∞ 0.29
Image plane ∞
Aspheric data 7th surface
K = -2.25214e-001 A 4 = -4.08166e-005 A 6 = -6.66455e-006 A 8 = 6.05668e-008 A10 = 8.50626e-010 A12 = -9.00224e-011
16th page
K = -1.27172e + 000 A 4 = 8.73763e-005 A 6 = -2.13428e-006 A 8 = -5.69547e-008 A10 = 7.22877e-010
17th page
K = -1.16189e + 000 A 4 = 7.03186e-005 A 6 = -3.61622e-006
30th page
K = 0.00000e + 000 A 4 = -2.61725e-005
Various data Zoom ratio 18.97
Wide angle Medium Telephoto focal length 5.15 8.86 97.80
F number 2.94 3.42 6.07
Angle of view 36.94 23.63 2.27
Image height 3.88 3.88 3.88
Total lens length 89.13 89.47 99.60
BF 3.24 3.24 3.24
d 5 0.59 3.17 16.70
d11 6.53 4.29 0.90
d15 15.10 11.61 0.80
d23 0.87 4.36 15.18
d26 8.87 6.52 1.03
d29 4.00 8.91 18.96
d31 7.91 5.36 0.80
Zoom lens group data group Start surface Focal length
1 1 30.08
2 6 -7.85
3 12 -34.35
4 16 13.61
5 24 -16.01
6 27 62.83
7 30 21.15
8 32 57.83
9 34 ∞
［数値実施例４］
単位 mm
面データ
面番号 r d nd νd
1 28.847 1.10 1.85478 24.8
2 18.520 4.30 1.49700 81.5
3 367.400 0.10
4 20.867 2.30 1.69680 55.5
5 92.328 (可変)
6 -108.853 0.50 1.84954 40.1
7* 6.155 3.81
8 -19.925 0.50 1.83481 42.7
9 32.687 0.09
10 18.281 2.20 1.95906 17.5
11 -45.746 (可変)
12 ∞ 8.00 1.83481 42.7
13 ∞ 0.84
14 -16.566 0.60 1.88300 40.8
15 -37.124 (可変)
16* 8.129 2.50 1.49700 81.5
17* -18.843 1.00
18(絞り) ∞ 0.00
19 ∞ 1.00
20 9.276 0.60 2.00069 25.5
21 6.781 1.67
22 38.087 2.50 1.48749 70.2
23 -12.307 0.50 1.88300 40.8
24 -20.646 (可変)
25 -28.912 0.50 1.88300 40.8
26 13.543 1.00 1.95906 17.5
27 24.165 (可変)
28* 34.310 1.30 1.55332 71.7
29 -60.656 (可変)
30* 18.330 2.40 1.76802 49.2
31 -21.195 0.40 1.95906 17.5
32 -52.153 (可変)
33 ∞ 0.80 1.51633 64.1
34 ∞ 1.78
像面 ∞
非球面データ
第7面
K =-3.88896e-001 A 4= 2.72804e-005 A 6=-1.27015e-006 A 8=-4.96261e-008 A10= 1.86482e-009 A12=-5.55864e-011
第16面
K =-1.66980e+000 A 4= 1.31192e-004 A 6=-2.41725e-006 A 8=-7.08056e-009
第17面
K =-3.77427e+000 A 4= 5.16959e-005 A 6=-2.45772e-006
第28面
K = 6.07793e+000 A 4=-5.48847e-005 A 6= 5.00162e-007
第30面
K =-9.34293e-001 A 4= 4.44699e-005 A 6=-4.50415e-007
各種データ
ズーム比 18.98
広角 中間 望遠
焦点距離 5.15 7.04 97.80
Fナンバー 3.75 3.96 6.07
画角 36.94 28.82 2.27
像高 3.88 3.88 3.88
レンズ全長 79.54 78.48 89.93
BF 11.21 10.92 3.61
d 5 0.70 1.39 16.61
d11 6.42 4.67 0.90
d15 12.97 10.24 0.80
d24 1.62 4.35 13.79
d27 5.39 4.11 1.12
d29 1.53 3.10 13.41
d32 8.90 8.61 1.30
ズームレンズ群データ
群 始面 焦点距離
1 1 29.10
2 6 -7.78
3 12 -34.35
4 16 13.39
5 25 -15.29
6 28 39.80
7 30 19.76
8 33 ∞
[Numerical Example 4]
Unit mm
Surface data surface number rd nd νd
1 28.847 1.10 1.85478 24.8
2 18.520 4.30 1.49700 81.5
3 367.400 0.10
4 20.867 2.30 1.69680 55.5
5 92.328 (variable)
6 -108.853 0.50 1.84954 40.1
7 * 6.155 3.81
8 -19.925 0.50 1.83481 42.7
9 32.687 0.09
10 18.281 2.20 1.95906 17.5
11 -45.746 (variable)
12 ∞ 8.00 1.83481 42.7
13 ∞ 0.84
14 -16.566 0.60 1.88300 40.8
15 -37.124 (variable)
16 * 8.129 2.50 1.49700 81.5
17 * -18.843 1.00
18 (Aperture) ∞ 0.00
19 ∞ 1.00
20 9.276 0.60 2.00069 25.5
21 6.781 1.67
22 38.087 2.50 1.48749 70.2
23 -12.307 0.50 1.88300 40.8
24 -20.646 (variable)
25 -28.912 0.50 1.88300 40.8
26 13.543 1.00 1.95906 17.5
27 24.165 (variable)
28 * 34.310 1.30 1.55332 71.7
29 -60.656 (variable)
30 * 18.330 2.40 1.76802 49.2
31 -21.195 0.40 1.95906 17.5
32 -52.153 (variable)
33 ∞ 0.80 1.51633 64.1
34 ∞ 1.78
Image plane ∞
Aspheric data 7th surface
K = -3.88896e-001 A 4 = 2.72804e-005 A 6 = -1.27015e-006 A 8 = -4.96261e-008 A10 = 1.86482e-009 A12 = -5.55864e-011
16th page
K = -1.66980e + 000 A 4 = 1.31192e-004 A 6 = -2.41725e-006 A 8 = -7.08056e-009
17th page
K = -3.77427e + 000 A 4 = 5.16959e-005 A 6 = -2.45772e-006
28th page
K = 6.07793e + 000 A 4 = -5.48847e-005 A 6 = 5.00162e-007
30th page
K = -9.34293e-001 A 4 = 4.44699e-005 A 6 = -4.50415e-007
Various data Zoom ratio 18.98
Wide angle Medium Telephoto focal length 5.15 7.04 97.80
F number 3.75 3.96 6.07
Angle of view 36.94 28.82 2.27
Image height 3.88 3.88 3.88
Total lens length 79.54 78.48 89.93
BF 11.21 10.92 3.61
d 5 0.70 1.39 16.61
d11 6.42 4.67 0.90
d15 12.97 10.24 0.80
d24 1.62 4.35 13.79
d27 5.39 4.11 1.12
d29 1.53 3.10 13.41
d32 8.90 8.61 1.30
Zoom lens group data group Start surface Focal length
1 1 29.10
2 6 -7.78
3 12 -34.35
4 16 13.39
5 25 -15.29
6 28 39.80
7 30 19.76
8 33 ∞
［数値実施例５］
単位 mm
面データ
面番号 r d nd νd
1 28.934 1.10 1.85478 24.8
2 18.576 4.20 1.49700 81.5
3 190.531 0.10
4 21.116 2.30 1.69680 55.5
5 97.669 (可変)
6 -105.715 0.50 1.84954 40.1
7* 6.366 3.68
8 -19.957 0.50 1.83481 42.7
9 36.449 0.09
10 18.136 2.10 1.95906 17.5
11 -44.498 (可変)
12 ∞ 8.00 1.83481 42.7
13 ∞ 0.84
14 -16.566 0.60 1.88300 40.8
15 -37.124 (可変)
16* 8.342 2.50 1.55332 71.7
17* -25.623 1.00
18(絞り) ∞ 0.00
19 ∞ 1.00
20 10.072 0.60 2.00069 25.5
21 6.798 1.50
22 28.661 2.50 1.48749 70.2
23 -11.133 0.50 1.88300 40.8
24 -21.572 (可変)
25 -42.602 0.50 1.88300 40.8
26 16.828 1.00 1.95906 17.5
27 30.924 (可変)
28* 19.520 1.30 1.55332 71.7
29 185.397 (可変)
30* 21.980 2.30 1.74330 49.3
31 -18.813 0.40 2.00272 19.3
32 -38.462 (可変)
33 ∞ 0.80 1.51633 64.1
34 ∞ 1.80
像面 ∞
非球面データ
第7面
K =-3.25008e-001 A 4= 2.02349e-005 A 6=-2.02643e-006 A 8=-5.52252e-008 A10= 1.00641e-009 A12=-3.14473e-011
第16面
K =-1.78084e+000 A 4= 1.07830e-004 A 6=-6.33286e-007 A 8=-6.36902e-009
第17面
K =-8.22510e-001 A 4=-7.42991e-007 A 6= 1.25564e-007
第28面
K =-2.99681e-003 A 4=-3.47298e-005 A 6= 1.06592e-007
第30面
K =-2.82638e-001 A 4= 1.81962e-005 A 6=-2.76482e-007
各種データ
ズーム比 18.99
広角 中間 望遠
焦点距離 5.15 7.20 97.80
Fナンバー 3.66 3.83 6.07
画角 36.96 28.30 2.27
像高 3.88 3.88 3.88
レンズ全長 80.69 79.62 91.68
BF 10.79 10.79 4.02
d 5 0.70 1.81 17.39
d11 6.61 4.42 0.90
d15 13.96 11.08 0.80
d24 1.26 4.15 14.42
d27 7.47 5.67 1.48
d29 0.80 2.60 13.56
d32 8.46 8.46 1.70
ズームレンズ群データ
群 始面 焦点距離
1 1 30.18
2 6 -8.41
3 12 -34.35
4 16 14.28
5 25 -21.00
6 28 39.32
7 30 22.01
8 33 ∞
[Numerical Example 5]
Unit mm
Surface data surface number rd nd νd
1 28.934 1.10 1.85478 24.8
2 18.576 4.20 1.49700 81.5
3 190.531 0.10
4 21.116 2.30 1.69680 55.5
5 97.669 (variable)
6 -105.715 0.50 1.84954 40.1
7 * 6.366 3.68
8 -19.957 0.50 1.83481 42.7
9 36.449 0.09
10 18.136 2.10 1.95906 17.5
11 -44.498 (variable)
12 ∞ 8.00 1.83481 42.7
13 ∞ 0.84
14 -16.566 0.60 1.88300 40.8
15 -37.124 (variable)
16 * 8.342 2.50 1.55332 71.7
17 * -25.623 1.00
18 (Aperture) ∞ 0.00
19 ∞ 1.00
20 10.072 0.60 2.00069 25.5
21 6.798 1.50
22 28.661 2.50 1.48749 70.2
23 -11.133 0.50 1.88 300 40.8
24 -21.572 (variable)
25 -42.602 0.50 1.88300 40.8
26 16.828 1.00 1.95906 17.5
27 30.924 (variable)
28 * 19.520 1.30 1.55332 71.7
29 185.397 (variable)
30 * 21.980 2.30 1.74330 49.3
31 -18.813 0.40 2.00272 19.3
32 -38.462 (variable)
33 ∞ 0.80 1.51633 64.1
34 ∞ 1.80
Image plane ∞
Aspheric data 7th surface
K = -3.25008e-001 A 4 = 2.02349e-005 A 6 = -2.02643e-006 A 8 = -5.52252e-008 A10 = 1.00641e-009 A12 = -3.14473e-011
16th page
K = -1.78084e + 000 A 4 = 1.07830e-004 A 6 = -6.33286e-007 A 8 = -6.36902e-009
17th page
K = -8.22510e-001 A 4 = -7.42991e-007 A 6 = 1.25564e-007
28th page
K = -2.99681e-003 A 4 = -3.47298e-005 A 6 = 1.06592e-007
30th page
K = -2.82638e-001 A 4 = 1.81962e-005 A 6 = -2.76482e-007
Various data Zoom ratio 18.99
Wide angle Medium Telephoto focal length 5.15 7.20 97.80
F number 3.66 3.83 6.07
Angle of view 36.96 28.30 2.27
Image height 3.88 3.88 3.88
Total lens length 80.69 79.62 91.68
BF 10.79 10.79 4.02
d 5 0.70 1.81 17.39
d11 6.61 4.42 0.90
d15 13.96 11.08 0.80
d24 1.26 4.15 14.42
d27 7.47 5.67 1.48
d29 0.80 2.60 13.56
d32 8.46 8.46 1.70
Zoom lens group data group Start surface Focal length
1 1 30.18
2 6 -8.41
3 12 -34.35
4 16 14.28
5 25 -21.00
6 28 39.32
7 30 22.01
8 33 ∞
［数値実施例６］
単位 mm
面データ
面番号 r d nd νd
1 28.887 1.10 1.85478 24.8
2 18.595 4.35 1.49700 81.5
3 178.495 0.10
4 21.249 2.40 1.69680 55.5
5 97.329 (可変)
6 -125.028 0.50 1.84954 40.1
7* 6.250 4.09
8 -19.992 0.50 1.83481 42.7
9 35.566 0.09
10 18.461 2.20 1.95906 17.5
11 -44.682 (可変)
12 ∞ 8.00 1.83481 42.7
13 ∞ 0.84
14 -16.566 0.60 1.88300 40.8
15 -37.124 (可変)
16* 8.442 2.50 1.55332 71.7
17* -26.523 1.00
18(絞り) ∞ 0.00
19 ∞ 1.00
20 9.816 0.60 2.00069 25.5
21 6.762 1.40
22 28.360 2.50 1.48749 70.2
23 -11.720 0.50 1.88300 40.8
24 -20.343 (可変)
25 -20.507 0.50 1.88300 40.8
26 17.453 1.00 1.95906 17.5
27 32.849 (可変)
28* 27.183 1.30 1.55332 71.7
29 -117.100 (可変)
30* 16.535 2.50 1.58313 59.4
31 -18.122 0.40 2.00272 19.3
32 -25.677 (可変)
33 ∞ 0.80 1.51633 64.1
34 ∞ 0.75
像面 ∞
非球面データ
第7面
K =-2.99122e-001 A 4= 3.39049e-005 A 6=-1.45190e-006 A 8=-2.53443e-007 A10= 1.18334e-008 A12=-2.05586e-010
第16面
K =-1.80490e+000 A 4= 1.88604e-004 A 6=-8.19104e-007 A 8= 1.58539e-009
第17面
K =-9.49948e-001 A 4= 8.49721e-005 A 6=-2.46334e-007
第28面
K = 1.42218e+000 A 4=-1.93602e-005 A 6= 2.06920e-007
第30面
K =-9.34401e-001 A 4= 3.29907e-006 A 6=-3.39966e-007
各種データ
ズーム比 23.64
広角 中間 望遠
焦点距離 5.16 7.30 121.90
Fナンバー 3.75 4.00 6.89
画角 36.92 27.96 1.82
像高 3.88 3.88 3.88
レンズ全長 83.63 82.56 94.84
BF 13.43 13.45 3.57
d 5 0.70 1.77 17.81
d11 6.84 4.69 0.93
d15 13.39 10.61 0.80
d24 1.40 4.19 14.00
d27 7.11 5.28 1.00
d29 0.80 2.62 16.77
d32 12.16 12.17 2.30
ズームレンズ群データ
群 始面 焦点距離
1 1 30.49
2 6 -8.22
3 12 -34.35
4 16 13.86
5 25 -14.54
6 28 40.00
7 30 19.93
8 33 ∞
[Numerical Example 6]
Unit mm
Surface data surface number rd nd νd
1 28.887 1.10 1.85478 24.8
2 18.595 4.35 1.49700 81.5
3 178.495 0.10
4 21.249 2.40 1.69680 55.5
5 97.329 (variable)
6 -125.028 0.50 1.84954 40.1
7 * 6.250 4.09
8 -19.992 0.50 1.83481 42.7
9 35.566 0.09
10 18.461 2.20 1.95906 17.5
11 -44.682 (variable)
12 ∞ 8.00 1.83481 42.7
13 ∞ 0.84
14 -16.566 0.60 1.88300 40.8
15 -37.124 (variable)
16 * 8.442 2.50 1.55332 71.7
17 * -26.523 1.00
18 (Aperture) ∞ 0.00
19 ∞ 1.00
20 9.816 0.60 2.00069 25.5
21 6.762 1.40
22 28.360 2.50 1.48749 70.2
23 -11.720 0.50 1.88300 40.8
24 -20.343 (variable)
25 -20.507 0.50 1.88300 40.8
26 17.453 1.00 1.95906 17.5
27 32.849 (variable)
28 * 27.183 1.30 1.55332 71.7
29 -117.100 (variable)
30 * 16.535 2.50 1.58313 59.4
31 -18.122 0.40 2.00272 19.3
32 -25.677 (variable)
33 ∞ 0.80 1.51633 64.1
34 ∞ 0.75
Image plane ∞
Aspheric data 7th surface
K = -2.99122e-001 A 4 = 3.39049e-005 A 6 = -1.45190e-006 A 8 = -2.53443e-007 A10 = 1.18334e-008 A12 = -2.05586e-010
16th page
K = -1.80490e + 000 A 4 = 1.88604e-004 A 6 = -8.19104e-007 A 8 = 1.58539e-009
17th page
K = -9.49948e-001 A 4 = 8.49721e-005 A 6 = -2.46334e-007
28th page
K = 1.42218e + 000 A 4 = -1.93602e-005 A 6 = 2.06920e-007
30th page
K = -9.34401e-001 A 4 = 3.29907e-006 A 6 = -3.39966e-007
Various data Zoom ratio 23.64
Wide angle Medium telephoto focal length 5.16 7.30 121.90
F number 3.75 4.00 6.89
Angle of view 36.92 27.96 1.82
Image height 3.88 3.88 3.88
Total lens length 83.63 82.56 94.84
BF 13.43 13.45 3.57
d 5 0.70 1.77 17.81
d11 6.84 4.69 0.93
d15 13.39 10.61 0.80
d24 1.40 4.19 14.00
d27 7.11 5.28 1.00
d29 0.80 2.62 16.77
d32 12.16 12.17 2.30
Zoom lens group data group Start surface Focal length
1 1 30.49
2 6 -8.22
3 12 -34.35
4 16 13.86
5 25 -14.54
6 28 40.00
7 30 19.93
8 33 ∞
Ｌ１ 第１レンズ群、Ｌ２ 第２レンズ群、Ｌ３ 第３レンズ群、Ｌ４ 第４レンズ群、
Ｌ５ 第５レンズ群、Ｌ６ 第６レンズ群、Ｌ７ 第７レンズ群 ＰＲ 反射部材、
ＬＲ 後続レンズ群
L1 first lens group, L2 second lens group, L3 third lens group, L4 fourth lens group,
L5 5th lens group, L6 6th lens group, L7 7th lens group PR reflecting member,
LR Subsequent lens group
Claims (8)
０．２＜ｆ１／ｆｔ＜０．５
なる条件式を満足することを特徴とするズームレンズ。 In order from the object side to the image side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group including a reflecting member that bends the optical path, and a subsequent lens group including a plurality of lens groups. The subsequent lens group has, in order from the object side to the image side, an Nth lens group having a negative refractive power, a P1 lens group having a positive refractive power, and a P2 lens group having a positive refractive power, The Nth lens group includes a negative lens and a positive lens. During zooming, the first lens group, the second lens group, the P1 lens group, and the P2 lens group move, and the third lens group zooms. Therefore, when the focal length of the first lens unit is f1, and the focal length of the entire system at the telephoto end is ft,
0.2 <f1 / ft <0.5
A zoom lens satisfying the following conditional expression:
−５．０＜ｆ５／ｆｗ＜−２．０
０．３＜ｆ５ｎ／ｆ５＜１．１
１２＜ν５ｐ−ν５ｎ＜２８
なる条件式を満足することを特徴とする請求項１に記載のズームレンズ。 The succeeding lens group includes, in order from the object side to the image side, a fourth lens group having a positive refractive power, a fifth lens group having a negative refractive power, a sixth lens group having a positive refractive power, and a sixth lens group having a positive refractive power. The fifth lens group includes a negative lens and a positive lens, the focal length of the fifth lens group is f5, the focal length of the entire system at the wide angle end is fw, and the negative lens of the fifth lens group is negative. When the focal length of the lens is f5n, and the Abbe numbers of the negative lens and positive lens materials of the fifth lens group are ν5n and ν5p, respectively.
−5.0 <f5 / fw <−2.0
0.3 <f5n / f5 <1.1
12 <ν5p−ν5n <28
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.
０．６＜ｍ１／ｍ４＜１．１
０．５＜ｍ６／ｆｗ＜１．７
なる条件式を満足することを特徴とする請求項２に記載のズームレンズ。 When the amount of movement of the i-th lens group (i = 1, 4, 6) during zooming from the wide-angle end to the telephoto end is mi,
0.6 <m1 / m4 <1.1
0.5 <m6 / fw <1.7
The zoom lens according to claim 2, wherein the following conditional expression is satisfied.
１．６＜ｍ４／（ｍ６−ｍ５）＜３．５
−１．３＜ｍ６／ｍ７＜−０．４
１５＜ｆｔ／ｆｗ＜３０
なる条件式を満足することを特徴とする請求項２又は３に記載のズームレンズ。 When the amount of movement of the i-th lens group (i = 4, 5, 6, 7) during zooming from the wide-angle end to the telephoto end is mi,
1.6 <m4 / (m6-m5) <3.5
−1.3 <m6 / m7 <−0.4
15 <ft / fw <30
The zoom lens according to claim 2, wherein the following conditional expression is satisfied.
広角端から望遠端へのズーミングに際して、前記第１レンズ群は物体側へ凸状の軌跡を描いて移動し、前記第２レンズ群は像側へ移動し、前記第４レンズ群は物体側へ移動し、前記第５レンズ群は像面に対して固定され、前記第６レンズ群は物体側へ移動し、前記第７レンズ群は物体側へ凸の軌跡を描いて移動し、
該ズームレンズの沈胴収納に際して、前記第３レンズ群は前記第１、第２レンズ群の光軸に対して垂直方向へ移動し、前記第３レンズ群の移動によって生じた空間に前記第１、第２レンズ群の少なくとも一部が沈胴収納されることを特徴とする請求項１乃至５のいずれか１項に記載のズームレンズ。 The third lens group has a negative refractive power, and the succeeding lens group includes a fourth lens group having a positive refractive power, a fifth lens group having a negative refractive power, and a positive lens in order from the object side to the image side. A sixth lens group having a refractive power and a seventh lens group having a positive refractive power;
During zooming from the wide-angle end to the telephoto end, the first lens group moves along a convex locus toward the object side, the second lens group moves toward the image side, and the fourth lens group moves toward the object side. The fifth lens group is fixed with respect to the image plane, the sixth lens group moves toward the object side, the seventh lens group moves along a locus convex toward the object side,
When the zoom lens is retracted, the third lens group moves in a direction perpendicular to the optical axes of the first and second lens groups, and the first and second lenses move into a space generated by the movement of the third lens group. The zoom lens according to any one of claims 1 to 5, wherein at least a part of the second lens group is retracted.
広角端から望遠端へのズーミングに際して、前記第１レンズ群は物体側へ凸状の軌跡を描いて移動し、前記第２レンズ群は像側へ移動し、前記第４レンズ群は物体側へ移動し、前記第５レンズ群は像面に対して固定され、前記第６レンズ群は物体側へ移動し、前記第７レンズ群は物体側へ凸の軌跡を描いて移動し、前記第８レンズ群はズーミングのためには不動であることを特徴とする請求項１乃至６のいずれか１項に記載のズームレンズ。 The succeeding lens group includes, in order from the object side to the image side, a fourth lens group having a positive refractive power, a fifth lens group having a negative refractive power, a sixth lens group having a positive refractive power, and a sixth lens group having a positive refractive power. 7 lens groups and an 8th lens group with positive refractive power,
During zooming from the wide-angle end to the telephoto end, the first lens group moves along a convex locus toward the object side, the second lens group moves toward the image side, and the fourth lens group moves toward the object side. The fifth lens group is fixed with respect to the image plane, the sixth lens group moves toward the object side, the seventh lens group moves along a locus convex toward the object side, and the eighth lens group moves toward the object side. The zoom lens according to claim 1, wherein the lens group does not move for zooming.
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| JP2011245228A JP5825983B2 (en) | 2011-11-09 | 2011-11-09 | Zoom lens and imaging apparatus having the same |
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| JP2013101238A5 JP2013101238A5 (en) | 2014-12-11 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014186306A (en) * | 2013-02-22 | 2014-10-02 | Panasonic Corp | Zoom lens system, interchangeable lens device, and camera system |
| JP5855793B2 (en) * | 2013-08-22 | 2016-02-09 | オリンパス株式会社 | Endoscope objective optical system |
| US9715097B2 (en) | 2014-06-24 | 2017-07-25 | Carl Zeiss Meditec Ag | Stereomicroscope having a main observer beam path and a co-observer beam path |
| JP2020086328A (en) * | 2018-11-30 | 2020-06-04 | 株式会社タムロン | Zoom lens and image capturing device |
| JPWO2021131369A1 (en) * | 2019-12-23 | 2021-07-01 | ||
| JP7423044B2 (en) | 2019-11-26 | 2024-01-29 | 株式会社シグマ | Optical system |
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| TWI778776B (en) * | 2021-08-13 | 2022-09-21 | 大立光電股份有限公司 | Optical lens module and electronic device |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014186306A (en) * | 2013-02-22 | 2014-10-02 | Panasonic Corp | Zoom lens system, interchangeable lens device, and camera system |
| JP5855793B2 (en) * | 2013-08-22 | 2016-02-09 | オリンパス株式会社 | Endoscope objective optical system |
| JPWO2015025843A1 (en) * | 2013-08-22 | 2017-03-02 | オリンパス株式会社 | Endoscope objective optical system |
| US10101575B2 (en) | 2013-08-22 | 2018-10-16 | Olympus Corporation | Endoscope objective optical system |
| US10670854B2 (en) | 2013-08-22 | 2020-06-02 | Olympus Corporation | Endoscope objective optical system |
| US9715097B2 (en) | 2014-06-24 | 2017-07-25 | Carl Zeiss Meditec Ag | Stereomicroscope having a main observer beam path and a co-observer beam path |
| JP2020086328A (en) * | 2018-11-30 | 2020-06-04 | 株式会社タムロン | Zoom lens and image capturing device |
| JP7157641B2 (en) | 2018-11-30 | 2022-10-20 | 株式会社タムロン | Zoom lens and imaging device |
| JP7423044B2 (en) | 2019-11-26 | 2024-01-29 | 株式会社シグマ | Optical system |
| JPWO2021131369A1 (en) * | 2019-12-23 | 2021-07-01 | ||
| WO2021131369A1 (en) * | 2019-12-23 | 2021-07-01 | 株式会社ニコン | Variable-power optical system, optical instrument, and method for manufacturing variable-power optical system |
| CN114868067A (en) * | 2019-12-23 | 2022-08-05 | 株式会社尼康 | Variable magnification optical system, optical apparatus, and method for manufacturing variable magnification optical system |
| JP7318739B2 (en) | 2019-12-23 | 2023-08-01 | 株式会社ニコン | Variable Magnification Optical System and Optical Equipment |
| CN114868067B (en) * | 2019-12-23 | 2024-03-22 | 株式会社尼康 | Variable magnification optical system and optical device |
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| JP5825983B2 (en) | 2015-12-02 |
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