JP2016024341A - Zoom lens and image capturing device having the same - Google Patents
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Abstract
【課題】有限距離における変倍比低下の抑制と、高性能化を両立したズームレンズ及びそれを有する撮像装置を提供することである。
【解決手段】物体側から順に、変倍中固定で正の屈折力の第１レンズ群、変倍に際し可動で負の屈折力の第２レンズ群、変倍に際し可動又は固定で負の屈折力の第３レンズ群、変倍に際し可動で正の屈折力の第４レンズ群、変倍中固定で正の屈折力の第５レンズ群から構成されるズームレンズにおいて、無限端から至近端に向けてフォーカシングを行う際、第２レンズ群、第３レンズ群、第４レンズ群が像側に移動する。
【選択図】図３A zoom lens and an image pickup apparatus having the zoom lens satisfying both suppression of a reduction in zoom ratio at a finite distance and high performance.
In order from the object side, a first lens unit having a positive refractive power that is fixed during zooming, a second lens unit having a negative power that is movable during zooming, and a negative refractive power that is movable or fixed during zooming. In the zoom lens composed of the third lens group, the fourth lens group movable and having a positive refractive power during zooming, and the fifth lens group having a positive refractive power fixed during zooming, from the infinite end to the close end When focusing toward the image, the second lens group, the third lens group, and the fourth lens group move to the image side.
[Selection] Figure 3
Description
本発明は、ズームレンズ及びそれを有する撮像装置に関する。特に、ズームレンズとしては、テレビカメラやビデオカメラ及び写真用カメラ、デジタルカメラに好適なズームレンズに関し、広角、高倍率且つ小型軽量なズームレンズに関するものである。 The present invention relates to a zoom lens and an imaging apparatus having the same. In particular, the zoom lens relates to a zoom lens suitable for a television camera, a video camera, a photographic camera, and a digital camera, and relates to a zoom lens having a wide angle, a high magnification, a small size and a light weight.
近年、テレビカメラ、銀塩フィルム用カメラ、デジタルカメラ、ビデオカメラ等の撮像装置には、広画角、高ズーム比でしかも高い光学性能を有したズームレンズが要望されている。広画角、高ズーム比のズームレンズとして、最も物体側に正の屈折力のレンズ群を配置した５つのレンズ群より成るポジティブリード型の５群ズームレンズが知られている。このポジティブリード型のズームレンズで更なる小型化を目的として、変倍機能を有する可動レンズ群がフォーカシング機能も併せ持った、特にテレビカメラに好適な５群ズームレンズが知られている（特許文献１、２）。 2. Description of the Related Art In recent years, zoom lenses having a wide angle of view, a high zoom ratio, and high optical performance have been demanded for imaging devices such as television cameras, silver salt film cameras, digital cameras, and video cameras. As a zoom lens having a wide angle of view and a high zoom ratio, a positive lead type five-unit zoom lens including five lens units in which a lens unit having a positive refractive power is disposed closest to the object side is known. In order to further reduce the size of this positive lead type zoom lens, there is known a 5-group zoom lens particularly suitable for a TV camera, in which a movable lens group having a zooming function also has a focusing function (Patent Document 1). 2).
特許文献１では、正の屈折力の第１レンズ群、変倍およびフォーカシング用の負の屈折力の第２レンズ群、負の屈折力の第３レンズ群、像面補正およびフォーカシング用の正の屈折力の第４レンズ群、結像用の正の屈折力の第５レンズ群から構成されたズームレンズが提案されている。 In Patent Document 1, a first lens group having a positive refractive power, a second lens group having a negative refractive power for zooming and focusing, a third lens group having a negative refractive power, and a positive lens for correcting image plane and focusing. There has been proposed a zoom lens including a fourth lens group having a refractive power and a fifth lens group having a positive refractive power for image formation.
また特許文献２では、正の屈折力の第１レンズ群、変倍用の負の屈折力の第２レンズ群、変倍用の負の屈折力の第３レンズ群、像面補正およびフォーカシング用の正の屈折力の第４レンズ群、結像用の正の屈折力の第５レンズ群から構成されたズームレンズが提案されている。 In Patent Document 2, a first lens group having a positive refractive power, a second lens group having a negative refractive power for zooming, a third lens group having a negative refractive power for zooming, and an image surface correcting and focusing lens. A zoom lens composed of a fourth lens group having a positive refractive power and a fifth lens group having a positive refractive power for image formation has been proposed.
従来、放送用ズームレンズの更なる小型軽量化を達成するために、リアフォーカス式が提案されている。しかしながら、放送用ズームレンズでは一般的に結像用の最終レンズ群の内部に焦点距離変換光学系が装脱可能な状態で配置されるため、焦点距離変換光学系装着時の望遠、物体距離至近側における繰り出し量が増大してしまう問題点があった。 Conventionally, a rear focus type has been proposed in order to achieve further reduction in size and weight of a broadcast zoom lens. However, in a broadcast zoom lens, the focal length conversion optical system is generally disposed inside the final lens group for image formation in a detachable state. There is a problem that the amount of feeding on the side increases.
特許文献１において、変倍用の第２レンズ群と像面補正用の第４レンズ群とでフォーカシングすることで焦点距離変換光学系装着時の望遠、物体距離至近側における繰り出し量の増大の抑制と、至近距離における変倍比の低下を抑制しているが、物体距離の変化による収差変動を十分に抑制できないという課題があった。 In Japanese Patent Laid-Open No. 2004-260688, focusing by the second lens unit for zooming and the fourth lens unit for correcting the image surface suppresses an increase in the amount of extension at the telephoto and object distance closest side when the focal length conversion optical system is mounted. Although the reduction of the zoom ratio at the close distance is suppressed, there is a problem that the aberration fluctuation due to the change of the object distance cannot be sufficiently suppressed.
また特許文献２において、像面補正用の第４レンズ群でフォーカシングを行い、焦点距離変換光学系装着時の望遠、物体距離至近側における繰り出し量の増大の抑制と高性能化は達成しているが、至近距離における変倍比が大きく低下するという課題があった。 Further, in Patent Document 2, focusing is performed by the fourth lens group for image plane correction, and the increase in the amount of extension at the telephoto and object distance closest side when the focal length conversion optical system is mounted and high performance are achieved. However, there is a problem that the zoom ratio at a close distance is greatly reduced.
本発明の目的は、第２レンズ群、第３レンズ群、第４レンズ群をフォーカシングに伴って移動させる構成とすることで、至近距離における変倍比低下の抑制と、高性能化を両立したズームレンズ及びそれを有する撮像装置を提供することである。 An object of the present invention is to achieve both the suppression of a reduction in zoom ratio at a close distance and high performance by moving the second lens group, the third lens group, and the fourth lens group with focusing. A zoom lens and an imaging apparatus having the same are provided.
上記目的を達成するために、本発明に係るズームレンズ及びそれを有する撮像装置は、物体側から順に、変倍中固定で正の屈折力の第１レンズ群、変倍に際し可動で負の屈折力の第２レンズ群、変倍に際し可動又は固定で負の屈折力の第３レンズ群、変倍に際し可動で正の屈折力の第４レンズ群、変倍中固定で正の屈折力の第５レンズ群から構成されるズームレンズにおいて、無限端から至近端に向けてフォーカシングを行う際、前記第２レンズ群、前記第３レンズ群、前記第４レンズ群が像側に移動し、前記第２レンズ群及び前記第３レンズ群の物体距離無限遠から至近距離にかけての繰り出し量をそれぞれｄｘ２、ｄｘ３とし、前記第２レンズ群の焦点距離をｆ２とするとき、
０．２０＜｜ｄｘ２／ｆ２｜＜０．７０
０．１５＜ｄｘ３／ｄｘ２＜２．００
を満足することを特徴とする。
In order to achieve the above object, a zoom lens according to the present invention and an image pickup apparatus having the zoom lens include, in order from the object side, a first lens unit having a positive refractive power that is fixed during zooming, and is movable and negatively refracted during zooming. The second lens group of force, the third lens group of negative refractive power that is movable or fixed during zooming, the fourth lens group that is movable and positive of refractive power during zooming, the first positive refractive power that is fixed during zooming, In a zoom lens composed of five lens groups, when performing focusing from the infinite end toward the close end, the second lens group, the third lens group, and the fourth lens group move to the image side, When the amount of extension from the infinite object distance to the closest distance of the second lens group and the third lens group is dx2 and dx3, respectively, and the focal length of the second lens group is f2.
0.20 <| dx2 / f2 | <0.70
0.15 <dx3 / dx2 <2.00
It is characterized by satisfying.
本発明によれば、無限端から至近端に向けてフォーカシングを行う際、第２レンズ群、第３レンズ群、第４レンズ群が像側に繰り出す構成とすることで、至近距離における変倍比低下の抑制と、高性能化を両立したズームレンズ及びそれを有する撮像装置を提供することができる。 According to the present invention, when performing focusing from the infinite end toward the close end, the second lens group, the third lens group, and the fourth lens group are extended to the image side, so that zooming at a close distance is achieved. It is possible to provide a zoom lens and an image pickup apparatus having the zoom lens that achieve both reduction in the ratio and high performance.
以下に、本発明の実施の形態を添付の図面に基づいて詳細に説明する。図１は本発明のズームレンズの構成と、ズーミング及びフォーカシングに伴う各レンズ群の移動軌跡についての概念図である。 Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a conceptual diagram of the configuration of a zoom lens according to the present invention and the movement trajectory of each lens group associated with zooming and focusing.
物体側から像側へ順に、変倍中に固定の正の屈折力の第１レンズ群Ｇ１、変倍に際し可動で負の屈折力の第２レンズ群Ｇ２、変倍に際し可動又は固定で負の屈折力の第３レンズ群Ｇ３、変倍に際し可動で正の屈折力の第４レンズ群Ｇ４、変倍中に固定の正の屈折力の第５レンズ群Ｇ５から構成されている。尚、ＩＭＧは撮像面を表している。 In order from the object side to the image side, the first lens unit G1 having a fixed positive refractive power during zooming, the second lens unit G2 having a negative refractive power that is movable during zooming, and movable or fixed and negative during zooming. A third lens group G3 having a refractive power, a fourth lens group G4 having a positive refractive power movable during zooming, and a fifth lens group G5 having a positive refractive power fixed during zooming. Note that IMG represents an imaging surface.
本発明における広角端から望遠端にかけての第２レンズ群Ｇ２、第３レンズ群Ｇ３、第４レンズ群Ｇ４の物体距離無限遠における移動軌跡を実線で、物体距離至近における移動軌跡を破線で示している。 In the present invention, the movement locus at the object distance infinity of the second lens group G2, the third lens group G3, and the fourth lens group G4 from the wide-angle end to the telephoto end is indicated by a solid line, and the movement locus at the closest object distance is indicated by a broken line. Yes.
広角端（短焦点距離端）から望遠端（長焦点距離端）へのズーミングに際して第２レンズ群Ｇ２は像側に移動する。第３レンズ群Ｇ３はズーミングに際し不動であってもよいが、可動の場合には物体側に凸状の軌跡を描くように移動する。 During zooming from the wide-angle end (short focal length end) to the telephoto end (long focal length end), the second lens group G2 moves to the image side. The third lens group G3 may be stationary during zooming, but when it is movable, it moves so as to draw a convex locus on the object side.
フォーカシングに際しては、広角端から望遠端にかけて第２レンズ群Ｇ２、第３レンズ群Ｇ３及び第４レンズ群Ｇ４がそれぞれ物体側から像側に繰り出す。 During focusing, the second lens group G2, the third lens group G3, and the fourth lens group G4 extend from the object side to the image side from the wide-angle end to the telephoto end.
また、本発明のズームレンズにおいては、変倍群の第２レンズ群Ｇ２、第３レンズ群Ｇ３、変倍群の第４レンズ群Ｇ４がフォーカシングを行うことを規定しており、これらのレンズ群は焦点距離変換光学系よりも物体側に配置されるため、焦点距離変換光学系の挿脱によりフォーカシング時の繰り出し量が変わることはない。 In the zoom lens of the present invention, it is specified that the second lens group G2, the third lens group G3, and the fourth lens group G4 of the variable power group perform focusing, and these lens groups Is disposed closer to the object side than the focal length conversion optical system, the amount of feeding during focusing does not change due to the insertion / removal of the focal length conversion optical system.
次に、上述した各ズームレンズを撮像光学系として用いた撮像装置について説明する。図２は各実施例のズームレンズを撮影光学系として用いた撮像装置（テレビカメラシステム）の要部概略図である。図２において１０１は実施例１〜３のいずれか１つのズームレンズである。 Next, an image pickup apparatus using each of the zoom lenses described above as an image pickup optical system will be described. FIG. 2 is a schematic diagram of a main part of an image pickup apparatus (television camera system) using the zoom lens of each embodiment as a photographing optical system. In FIG. 2, reference numeral 101 denotes any one zoom lens of the first to third embodiments.
１２４はカメラである。ズームレンズ１０１はカメラ１２４に対して着脱可能になっている。１２５はカメラ１２４にズームレンズ１０１を装着することにより構成される撮像装置である。ズームレンズ１０１は第１レンズ群１１４、変倍及びフォーカシング時に光軸上を移動する第２、第３、第４レンズ群を含む変倍部（兼フォーカス部）１１５、結像用の第５レンズ群１１６を有している。ＳＰは開口絞りである。変倍並びにフォーカシング中に固定の第５レンズ群１１６は、光路中より挿抜可能な変倍光学系ＩＥを有している。 Reference numeral 124 denotes a camera. The zoom lens 101 can be attached to and detached from the camera 124. An imaging apparatus 125 is configured by attaching the zoom lens 101 to the camera 124. The zoom lens 101 includes a first lens group 114, a zoom unit (also a focus unit) 115 including second, third, and fourth lens groups that move on the optical axis during zooming and focusing, and a fifth lens for imaging. Group 116 is included. SP is an aperture stop. The fifth lens group 116 fixed during zooming and focusing has a zoom optical system IE that can be inserted and removed from the optical path.
変倍部１１５には、光軸方向に駆動される為の駆動機構が備わっている。１１７、１１８は変倍部１１５及び開口絞りＳＰを電動駆動するモータ等の駆動手段である。１１９、１２０は、変倍部１１５中の各レンズ群の光軸上の位置と、開口絞りＳＰの絞り径を検出する為のエンコーダやポテンショメータ、あるいはフォトセンサ等の検出器である。尚、変倍部１１５中の各レンズ群の駆動軌跡は、ヘリコイドやカムなどの機械的軌跡や、超音波モータなどによる電気的軌跡のどちらであっても構わない。 The zoom unit 115 includes a drive mechanism for driving in the optical axis direction. Reference numerals 117 and 118 denote driving means such as a motor for electrically driving the zooming unit 115 and the aperture stop SP. Reference numerals 119 and 120 denote detectors such as an encoder, a potentiometer, or a photosensor for detecting the position on the optical axis of each lens group in the zoom unit 115 and the aperture diameter of the aperture stop SP. The driving locus of each lens group in the zoom unit 115 may be either a mechanical locus such as a helicoid or a cam, or an electrical locus such as an ultrasonic motor.
カメラ１２４において、１０９はカメラ１２４内の光学フィルタや色分解プリズムに相当するガラスブロック、１１０はズームレンズ１０１によって形成された被写体像を受光するＣＣＤセンサやＣＭＯＳセンサ等の固体撮像素子（光電変換素子）である。また、１１１、１２２はカメラ１２４及びズームレンズ本体１０１の各種の駆動を制御するＣＰＵである。このように本発明のズームレンズをテレビカメラに適用することにより、高い光学性能を有する撮像装置を実現している。 In the camera 124, 109 is a glass block corresponding to an optical filter or color separation prism in the camera 124, and 110 is a solid-state imaging device (photoelectric conversion device) such as a CCD sensor or a CMOS sensor that receives a subject image formed by the zoom lens 101. ). Reference numerals 111 and 122 denote CPUs that control various types of driving of the camera 124 and the zoom lens body 101. Thus, by applying the zoom lens of the present invention to a television camera, an imaging device having high optical performance is realized.
（実施例１）
以下、本発明の実施例１（数値実施例１）について詳細に説明する。図３は、実施例１の広角端、物体距離無限遠におけるレンズ断面図である。物体側から順に、変倍中固定の正の屈折力の第１レンズ群Ｇ１、変倍に際し可動で負の屈折力の第２レンズ群Ｇ２、変倍に際し可動又は固定の負の屈折力の第３レンズ群Ｇ３、変倍に際し可動で正の屈折力の第４レンズ群Ｇ４、変倍中固定で正の屈折力の第５レンズ群Ｇ５から構成されている。ＳＰは開口絞り、Ｐは色分解光学プリズム、ＩＭＧは結像面である。
Example 1
Hereinafter, Example 1 (Numerical Example 1) of the present invention will be described in detail. 3 is a lens cross-sectional view at the wide-angle end and at an object distance of infinity in Example 1. FIG. In order from the object side, the first lens unit G1 having a positive refractive power that is fixed during zooming, the second lens unit G2 having a negative power that is movable during zooming, and the first lens unit G2 that is movable or fixed during zooming. The third lens group G3 includes a fourth lens group G4 having a positive refractive power that is movable during zooming, and a fifth lens group G5 having a positive refractive power that is fixed during zooming. SP is an aperture stop, P is a color separation optical prism, and IMG is an image plane.
また、第２レンズ群、第３レンズ群、第４レンズ群が物体距離無限遠から至近にかけて物体側から像側に繰り出すようにフォーカシングを行い、第２レンズ群の物体距離無限遠から至近距離にかけての繰り出し量をそれぞれｄｘ２とし、第２レンズ群の焦点距離をｆ２とするとき、条件式（１）を満足する。
０．２０＜｜ｄｘ２／ｆ２｜＜０．７０ ・・・（１）
条件式（１）は、第２レンズ群の至近端における繰り出し量ｄｘ２の範囲を規定するものである。第２レンズ群の繰り出し量を大きく取ると増倍効果が得られ、至近距離における変倍比低下を抑制する事ができる。条件式（１）の上限を上回ると、物体距離無限遠時に対する至近端での変倍比が大きくなり過ぎ、至近端での収差補正が困難となる。条件式（１）の下限を下回ると、至近距離における変倍比の低下が顕著になり許容できない。
Further, focusing is performed so that the second lens group, the third lens group, and the fourth lens group are extended from the object side to the image side from the object distance infinity to the close distance, and the second lens group is extended from the object distance infinity to the close distance. When the amount is dx2 and the focal length of the second lens group is f2, conditional expression (1) is satisfied.
0.20 <| dx2 / f2 | <0.70 (1)
Conditional expression (1) defines the range of the feeding amount dx2 at the closest end of the second lens group. If the amount of extension of the second lens group is increased, a multiplication effect can be obtained, and a reduction in zoom ratio at a close distance can be suppressed. If the upper limit of conditional expression (1) is exceeded, the zoom ratio at the close end with respect to infinity at the object distance becomes too large, and it becomes difficult to correct the aberration at the close end. If the lower limit of conditional expression (1) is not reached, the reduction in zoom ratio at a close distance becomes remarkable, which is unacceptable.
尚、条件式（１）は、
０．３５＜｜ｄｘ２／ｆ２｜＜０．５５ ・・・（１ａ）
を満足すると更に好ましい。
Conditional expression (1) is
0.35 <| dx2 / f2 | <0.55 (1a)
Is more preferable.
本発明のズームレンズは、第３レンズ群の物体距離無限遠から至近距離にかけての繰り出し量をｄｘ３としたとき、条件式（２）を満足する。
０．１５＜ｄｘ３／ｄｘ２＜２．００ ・・・（２）
条件式（２）は、第２レンズ群の至近端における繰り出し量ｄｘ２に対する第３レンズ群の至近端における繰り出し量ｄｘ３の範囲を規定するものである。特許文献１及び２の５群ズームレンズにおいては、特に望遠端の物体距離無限端から至近端にかけて、球面収差、像面湾曲及び非点収差の距離による変動が大きい。本発明のズームレンズにおいては、第２レンズ群が繰り出すことにより物体距離至近側での変倍比低下を抑制しているが、変倍比が大きくなるに従い、つまり繰り出し量が大きくなるに従い収差変動も増大する。
The zoom lens of the present invention satisfies the conditional expression (2) when the amount of extension of the third lens group from the infinite object distance to the close distance is dx3.
0.15 <dx3 / dx2 <2.00 (2)
Conditional expression (2) defines the range of the feed amount dx3 at the closest end of the third lens group to the feed amount dx2 at the close end of the second lens group. In the five-group zoom lens of Patent Documents 1 and 2, there is a large variation due to the distance of spherical aberration, field curvature, and astigmatism, particularly from the infinite object distance end to the close end at the telephoto end. In the zoom lens of the present invention, the reduction in the zoom ratio at the object distance closest side is suppressed by the second lens group being extended, but the aberration fluctuations as the zoom ratio increases, that is, as the extension amount increases. Will also increase.
これに対し、フォーカシングに際して第３レンズ群が像側に繰り出すことで、各レンズ群で発生する収差が打ち消し合い、無限端から至近端への諸収差の変動を抑制する事ができる。 On the other hand, when the third lens group is extended to the image side during focusing, aberrations occurring in the respective lens groups cancel each other, and fluctuations in various aberrations from the infinite end to the closest end can be suppressed.
条件式（２）の上限を上回ると、第３レンズ群の移動量が大きくなり過ぎ、小型軽量化並びに高性能化が困難となる。条件式（２）の下限を下回ると、物体距離変化による収差変動補正に十分な効果を得ることが困難となる。 If the upper limit of conditional expression (2) is exceeded, the amount of movement of the third lens group becomes too large, making it difficult to reduce the size and weight and to improve the performance. If the lower limit of conditional expression (2) is not reached, it will be difficult to obtain a sufficient effect for correcting aberration fluctuations due to changes in object distance.
尚、条件式（２）は、
０．４５＜ｄｘ３／ｄｘ２＜１．４０ ・・・（２ａ）
を満足すると更に好ましい。
Conditional expression (2) is
0.45 <dx3 / dx2 <1.40 (2a)
Is more preferable.
本発明のズームレンズにおいて、第１レンズ群の焦点距離をｆ１、第２レンズ群の焦点距離をｆ２、第３レンズ群の焦点距離をｆ３、第４レンズ群の焦点距離をｆ４としたとき、条件式（３）〜（５）を満足する。
４．０＜|ｆ１／ｆ２|＜８．０ ・・・（３）
０．８＜|ｆ１／ｆ３|＜３．０ ・・・（４）
０．８＜|ｆ１／ｆ４|＜４．５ ・・・（５）
各レンズ群の屈折力は各レンズ群の焦点距離の逆数で定義される。
In the zoom lens of the present invention, when the focal length of the first lens group is f1, the focal length of the second lens group is f2, the focal length of the third lens group is f3, and the focal length of the fourth lens group is f4, Conditional expressions (3) to (5) are satisfied.
4.0 <| f1 / f2 | <8.0 (3)
0.8 <| f1 / f3 | <3.0 (4)
0.8 <| f1 / f4 | <4.5 (5)
The refractive power of each lens group is defined by the reciprocal of the focal length of each lens group.
条件式（３）の上限を上回ると、第２レンズ群の屈折力が第１レンズ群の屈折力に対して相対的に強くなり過ぎ、諸収差の変動が増大し、補正が困難となる。条件式（３）の下限を下回ると、第２レンズ群の屈折力が第１レンズ群の屈折力に対して相対的に弱くなり過ぎ、高倍率化を達成することが困難となる。 If the upper limit of conditional expression (3) is exceeded, the refractive power of the second lens group becomes too strong relative to the refractive power of the first lens group, and variations in various aberrations increase, making correction difficult. If the lower limit of conditional expression (3) is not reached, the refractive power of the second lens group becomes too weak relative to the refractive power of the first lens group, making it difficult to achieve high magnification.
条件式（４）の上限を上回ると、第３レンズ群の屈折力が第１レンズ群の屈折力に対して相対的に強くなり過ぎ、球面収差、コマ収差の変動が増大し、補正が困難となる。条件式（４）の下限を下回ると、第３レンズ群の屈折力が第１レンズ群の屈折力に対して相対的に弱くなり過ぎ、距離変化による収差変動の補正が困難となる。 If the upper limit of conditional expression (4) is exceeded, the refractive power of the third lens group becomes too strong relative to the refractive power of the first lens group, and variations in spherical aberration and coma increase, making correction difficult. It becomes. If the lower limit of conditional expression (4) is not reached, the refractive power of the third lens group becomes too weak relative to the refractive power of the first lens group, making it difficult to correct aberration variations due to distance changes.
条件式（５）の上限を上回ると、第４レンズ群の屈折力が第１レンズ群の屈折力に対して相対的に強くなり過ぎ、球面収差、コマ収差の変動が増大し、補正が困難となる。条件式（５）の下限を下回ると、第４レンズ群の屈折力が第１レンズ群の屈折力に対して相対的に弱くなり過ぎ、像点補正のための移動量が増大し、小型軽量化を達成することが困難となる。 If the upper limit of conditional expression (5) is exceeded, the refractive power of the fourth lens group becomes too strong relative to the refractive power of the first lens group, and fluctuations in spherical aberration and coma increase, making correction difficult. It becomes. If the lower limit of conditional expression (5) is not reached, the refractive power of the fourth lens group becomes too weak relative to the refractive power of the first lens group, and the amount of movement for image point correction increases, making it compact and lightweight. It becomes difficult to achieve the conversion.
尚、条件式（３）、（４）、（５）は、
４．５＜|ｆ１／ｆ２|＜７．５ ・・・（３ａ）
１．０＜|ｆ１／ｆ３|＜２．５ ・・・（４ａ）
１．０＜|ｆ１／ｆ４|＜４．２ ・・・（５ａ）
を満足すると更に好ましい。
Conditional expressions (3), (4), (5)
4.5 <| f1 / f2 | <7.5 (3a)
1.0 <| f1 / f3 | <2.5 (4a)
1.0 <| f1 / f4 | <4.2 (5a)
Is more preferable.
本発明のズームレンズは物体距離無限遠時の変倍比をＺｉｎｆ、至近距離時の変倍比をＺｍｏｄとするとき、
０．６＜Ｚｍｏｄ／Ｚｉｎｆ≦１．０ ・・・（６）
を満たしていることが好ましい。
The zoom lens according to the present invention has a zoom ratio of Zinf at an object distance of infinity, and Zmod at a close distance.
0.6 <Zmod / Zinf ≦ 1.0 (6)
Is preferably satisfied.
尚、下記数値実施例におけるｒは曲率半径、ｄはレンズ厚またはレンズ間隔、ｎｄは波長５４６nmにおける屈折率、νdはアッベ数、*は非球面を示す。非球面は次式で定義される。 In the following numerical examples, r is a radius of curvature, d is a lens thickness or a lens interval, nd is a refractive index at a wavelength of 546 nm, νd is an Abbe number, and * is an aspherical surface. An aspheric surface is defined by the following equation.
但し、ｃは曲率(1/ｒ)、ｙは光軸からの高さ、Ｋは円錐係数、Ａ３、Ａ４、Ａ５、Ａ６・・・は各次数の非球面係数である。 Where c is the curvature (1 / r), y is the height from the optical axis, K is the conic coefficient, A3, A4, A5, A6... Are aspherical coefficients of the respective orders.
図４（Ａ）は実施例１の広角端で物体距離３．５ｍにおける縦収差図、図４（Ｂ）は望遠端で物体距離３．５ｍにおける縦収差図である。図５（Ａ）は実施例１の望遠端で無限遠物体に合焦しているときの縦収差図、図５（Ｂ）は望遠端で至近物体に合焦しているときの縦収差図である。 4A is a longitudinal aberration diagram at the wide-angle end of Example 1 at an object distance of 3.5 m, and FIG. 4B is a longitudinal aberration diagram at the telephoto end at an object distance of 3.5 m. FIG. 5A is a longitudinal aberration diagram when focusing on an object at infinity at the telephoto end in Example 1, and FIG. 5B is a longitudinal aberration diagram when focusing on a close object at the telephoto end. It is.
収差図中にて、軸上色収差図及び倍率色収差図中のｅ線、ｇ線はそれぞれの波長５４６ｎｍ、４３６ｎｍに対する収差である。ΔＳはサジタル、ΔＭはメリディオナルである。図中のＦｎｏはＦナンバー、ωは半画角（°）を示す。 In the aberration diagrams, the e-line and the g-line in the longitudinal chromatic aberration diagram and the magnification chromatic aberration diagram are aberrations with respect to the respective wavelengths of 546 nm and 436 nm. ΔS is sagittal and ΔM is meridional. In the figure, Fno represents an F number, and ω represents a half angle of view (°).
本実施例の各条件式対応値を表１に示す。本数値実施例はいずれの条件式も満足しており、物体距離至近側における変倍比低下を抑制しながら、良好な光学性能を達成している。 Table 1 shows values corresponding to the conditional expressions of this example. This numerical example satisfies all the conditional expressions, and achieves good optical performance while suppressing a reduction in zoom ratio on the object distance closest side.
（数値実施例１）
単位 mm
面データ
面番号 r d nd vd 有効径
1 -1000.706 2.54 2.00330 28.3 73.37
2 136.817 5.17 70.68
3 153.237 9.49 1.43387 95.1 71.07
4 -184.588 3.34 71.18
5 157.146 7.00 1.43387 95.1 70.31
6 -381.936 0.14 70.18
7 107.146 6.72 1.59240 68.3 68.61
8 1975.028 0.23 68.09
9 67.740 5.58 1.75500 52.3 63.39
10 145.021 (可変) 62.50
11* 102.700 0.95 1.88300 40.8 28.24
12 14.743 6.46 22.16
13 -60.723 6.64 1.80809 22.8 21.91
14 -14.024 0.71 1.88300 40.8 21.62
15 91.601 0.17 21.53
16 30.024 2.72 1.66680 33.0 21.83
17 103.058 (可変) 21.58
18 -32.202 0.71 1.75700 47.8 18.87
19 45.128 2.69 1.84649 23.9 20.13
20 3357.035 (可変) 20.67
21 -128.067 3.31 1.64000 60.1 25.54
22 -40.704 0.14 26.38
23 110.555 3.30 1.51633 64.1 27.47
24 -102.470 (可変) 27.68
25(絞り) ∞ 1.90 28.37
26 48.140 5.56 1.51742 52.4 28.64
27 -44.468 0.95 1.83400 37.2 28.47
28 4118.574 36.00 28.40
29 269.243 3.15 1.53172 48.8 27.35
30 -54.524 0.10 27.29
31 159.370 0.76 1.83400 37.2 26.40
32 24.493 4.47 1.50127 56.5 25.50
33 459.692 0.10 25.59
34 39.223 6.04 1.49700 81.5 25.92
35 -31.231 0.81 1.88300 40.8 25.78
36 252.063 0.10 26.11
37 53.343 4.39 1.56732 42.8 26.48
38 -53.156 4.28 26.45
39 ∞ 33.00 1.60859 46.4 40.00
40 ∞ 13.20 1.51633 64.1 40.00
41 ∞ 40.00
像面 ∞
非球面データ
第11面
K =-2.39810e+002 A 4= 3.08801e-005 A 6=-2.32121e-007 A 8=-5.87930e-010 A10=-4.94138e-012 A12= 1.62325e-014
A 3=-1.67594e-006 A 5=-3.66312e-007 A 7= 1.17893e-008 A 9= 1.25562e-010 A11=-3.11522e-013
各種データ
ズーム比 21.20
広角 中間 望遠
焦点距離 7.90 33.12 167.52
Fナンバー 1.86 1.86 2.70
画角 34.84 9.43 1.88
像高 5.50 5.50 5.50
レンズ全長 268.54 268.54 268.54
BF 9.33 9.33 9.33
d10 0.69 37.33 54.57
d17 58.17 9.71 7.79
d20 8.02 14.93 2.10
d24 9.52 14.43 11.94
入射瞳位置 45.08 187.48 832.48
射出瞳位置 -1565.60 -1565.60 -1565.60
前側主点位置 52.94 219.91 982.18
後側主点位置 1.43 -23.79 -158.18
ズームレンズ群データ
群 始面 焦点距離 レンズ構成長 前側主点位置 後側主点位置
1 1 72.97 40.20 25.75 -0.23
2 11 -14.77 17.65 1.76 -10.59
3 18 -45.90 3.40 -0.02 -1.87
4 21 48.58 6.75 3.08 -1.24
5 25 52.14 114.80 50.41 -49.80
（実施例２）
図６は、実施例２の広角端、物体距離無限遠におけるレンズ断面図である。物体側から順に、変倍中固定の正の屈折力の第１レンズ群Ｇ１、変倍に際し可動で負の屈折力の第２レンズ群Ｇ２、変倍に際し可動又は固定の負の屈折力の第３レンズ群Ｇ３、変倍に際し可動で正の屈折力の第４レンズ群Ｇ４、変倍中固定で正の屈折力の第５レンズ群Ｇ５から構成されている。ＳＰは開口絞り、Ｐは色分解光学プリズム、ＩＭＧは結像面である。
(Numerical example 1)
Unit mm
Surface data surface number rd nd vd Effective diameter
1 -1000.706 2.54 2.00330 28.3 73.37
2 136.817 5.17 70.68
3 153.237 9.49 1.43387 95.1 71.07
4 -184.588 3.34 71.18
5 157.146 7.00 1.43387 95.1 70.31
6 -381.936 0.14 70.18
7 107.146 6.72 1.59240 68.3 68.61
8 1975.028 0.23 68.09
9 67.740 5.58 1.75500 52.3 63.39
10 145.021 (variable) 62.50
11 * 102.700 0.95 1.88300 40.8 28.24
12 14.743 6.46 22.16
13 -60.723 6.64 1.80809 22.8 21.91
14 -14.024 0.71 1.88300 40.8 21.62
15 91.601 0.17 21.53
16 30.024 2.72 1.66680 33.0 21.83
17 103.058 (variable) 21.58
18 -32.202 0.71 1.75700 47.8 18.87
19 45.128 2.69 1.84649 23.9 20.13
20 3357.035 (variable) 20.67
21 -128.067 3.31 1.64000 60.1 25.54
22 -40.704 0.14 26.38
23 110.555 3.30 1.51633 64.1 27.47
24 -102.470 (variable) 27.68
25 (Aperture) ∞ 1.90 28.37
26 48.140 5.56 1.51742 52.4 28.64
27 -44.468 0.95 1.83400 37.2 28.47
28 4118.574 36.00 28.40
29 269.243 3.15 1.53172 48.8 27.35
30 -54.524 0.10 27.29
31 159.370 0.76 1.83400 37.2 26.40
32 24.493 4.47 1.50 127 56.5 25.50
33 459.692 0.10 25.59
34 39.223 6.04 1.49700 81.5 25.92
35 -31.231 0.81 1.88300 40.8 25.78
36 252.063 0.10 26.11
37 53.343 4.39 1.56732 42.8 26.48
38 -53.156 4.28 26.45
39 ∞ 33.00 1.60859 46.4 40.00
40 ∞ 13.20 1.51633 64.1 40.00
41 ∞ 40.00
Image plane ∞
Aspheric data 11th surface
K = -2.39810e + 002 A 4 = 3.08801e-005 A 6 = -2.32121e-007 A 8 = -5.87930e-010 A10 = -4.94138e-012 A12 = 1.62325e-014
A 3 = -1.67594e-006 A 5 = -3.66312e-007 A 7 = 1.17893e-008 A 9 = 1.25562e-010 A11 = -3.11522e-013
Various data Zoom ratio 21.20
Wide angle Intermediate Telephoto focal length 7.90 33.12 167.52
F number 1.86 1.86 2.70
Angle of view 34.84 9.43 1.88
Image height 5.50 5.50 5.50
Total lens length 268.54 268.54 268.54
BF 9.33 9.33 9.33
d10 0.69 37.33 54.57
d17 58.17 9.71 7.79
d20 8.02 14.93 2.10
d24 9.52 14.43 11.94
Entrance pupil position 45.08 187.48 832.48
Exit pupil position -1565.60 -1565.60 -1565.60
Front principal point position 52.94 219.91 982.18
Rear principal point position 1.43 -23.79 -158.18
Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 72.97 40.20 25.75 -0.23
2 11 -14.77 17.65 1.76 -10.59
3 18 -45.90 3.40 -0.02 -1.87
4 21 48.58 6.75 3.08 -1.24
5 25 52.14 114.80 50.41 -49.80
(Example 2)
FIG. 6 is a lens cross-sectional view of Embodiment 2 at the wide-angle end and at an object distance of infinity. In order from the object side, the first lens unit G1 having a positive refractive power that is fixed during zooming, the second lens unit G2 having a negative power that is movable during zooming, and the first lens unit G2 that is movable or fixed during zooming. The third lens group G3 includes a fourth lens group G4 having a positive refractive power that is movable during zooming, and a fifth lens group G5 having a positive refractive power that is fixed during zooming. SP is an aperture stop, P is a color separation optical prism, and IMG is an image plane.
図７（Ａ）は実施例２の広角端で物体距離２．５ｍにおける縦収差図、図７（Ｂ）は望遠端で物体距離２．５ｍにおける縦収差図である。図８（Ａ）は実施例２の望遠端で無限遠物体に合焦しているときの縦収差図、図８（Ｂ）は望遠端で至近物体に合焦しているときの縦収差図である。 7A is a longitudinal aberration diagram at the wide-angle end of Example 2 at an object distance of 2.5 m, and FIG. 7B is a longitudinal aberration diagram at the telephoto end at an object distance of 2.5 m. FIG. 8A is a longitudinal aberration diagram when focusing on an object at infinity at the telephoto end of Example 2, and FIG. 8B is a longitudinal aberration diagram when focusing on a close object at the telephoto end. It is.
本実施例の各条件式対応値を表１に示す。本数値実施例はいずれの条件式も満足しており、物体距離至近側における変倍比低下を抑制しながら、良好な光学性能を達成している。 Table 1 shows values corresponding to the conditional expressions of this example. This numerical example satisfies all the conditional expressions, and achieves good optical performance while suppressing a reduction in zoom ratio on the object distance closest side.
（数値実施例２）
単位 mm
面データ
面番号 r d nd vd 有効径
1 -150.466 2.30 1.75520 27.5 104.19
2 266.335 6.88 99.67
3 412.335 16.19 1.43875 94.9 98.71
4 -119.298 0.40 98.77
5 170.435 12.97 1.43387 95.1 93.97
6 -235.096 8.01 93.67
7 105.563 9.91 1.59240 68.3 84.49
8 1375.859 0.15 83.48
9 55.108 7.23 1.75500 52.3 72.53
10 86.856 (可変) 71.10
11 61.914 1.00 1.88300 40.8 31.92
12 15.037 8.14 24.30
13 -70.751 8.52 1.80809 22.8 23.58
14 -13.955 0.75 1.88300 40.8 22.77
15 49.984 0.18 22.05
16 27.024 2.89 1.66680 33.0 22.37
17 60.582 (可変) 22.04
18 -40.866 0.75 1.74320 49.3 20.97
19 55.892 2.50 1.84649 23.9 22.12
20 428.122 (可変) 22.60
21 156.571 4.56 1.77250 49.6 28.81
22 -53.135 (可変) 29.29
23(絞り) ∞ 1.50 29.65
24 78.366 3.87 1.53172 48.8 29.73
25 -202.387 0.40 29.51
26 128.885 6.39 1.48749 70.2 29.05
27 -33.944 1.00 1.88300 40.8 28.45
28 -312.517 36.00 28.47
29 -206.709 3.45 1.48749 70.2 26.02
30 -39.032 6.14 26.02
31 -159.177 1.00 1.83489 42.6 23.07
32 19.735 7.13 1.48749 70.2 22.99
33 -63.933 0.15 23.86
34 42.702 6.89 1.49700 81.5 25.03
35 -27.679 1.00 1.88300 40.8 25.10
36 298.737 0.30 26.10
37 50.338 6.25 1.57501 41.5 27.10
38 -32.698 4.50 27.25
39 ∞ 33.00 1.60859 46.4 40.00
40 ∞ 13.20 1.51633 64.1 40.00
41 ∞ 40.00
像面 ∞
各種データ
ズーム比 15.02
広角 中間 望遠
焦点距離 8.00 38.99 120.17
Fナンバー 1.90 1.90 1.93
画角 34.51 8.03 2.62
像高 5.50 5.50 5.50
レンズ全長 319.12 319.12 319.12
BF 6.99 6.99 6.99
d10 0.98 37.39 47.15
d17 66.44 24.29 20.23
d20 9.00 14.56 8.31
d22 10.19 10.37 10.92
入射瞳位置 63.01 279.97 774.78
射出瞳位置 187.26 187.26 187.26
前側主点位置 71.37 327.40 975.06
後側主点位置 -1.01 -32.00 -113.17
ズームレンズ群データ
群 始面 焦点距離 レンズ構成長 前側主点位置 後側主点位置
1 1 69.50 64.05 37.72 -2.23
2 11 -13.20 21.48 3.75 -10.23
3 18 -54.40 3.25 0.15 -1.62
4 21 51.60 4.56 1.94 -0.66
5 23 57.99 132.16 76.04 -57.10
（実施例３）
図９は、実施例３の広角端、物体距離無限遠におけるレンズ断面図である。物体側から順に、変倍中固定の正の屈折力の第１レンズ群Ｇ１、変倍に際し可動で負の屈折力の第２レンズ群Ｇ２、変倍に際し可動又は固定の負の屈折力の第３レンズ群Ｇ３、変倍に際し可動で正の屈折力の第４レンズ群Ｇ４、変倍中固定で正の屈折力の第５レンズ群Ｇ５から構成されている。ＳＰは開口絞り、Ｐは色分解光学プリズム、ＩＭＧは結像面である。
(Numerical example 2)
Unit mm
Surface data surface number rd nd vd Effective diameter
1 -150.466 2.30 1.75520 27.5 104.19
2 266.335 6.88 99.67
3 412.335 16.19 1.43875 94.9 98.71
4 -119.298 0.40 98.77
5 170.435 12.97 1.43387 95.1 93.97
6 -235.096 8.01 93.67
7 105.563 9.91 1.59240 68.3 84.49
8 1375.859 0.15 83.48
9 55.108 7.23 1.75500 52.3 72.53
10 86.856 (variable) 71.10
11 61.914 1.00 1.88300 40.8 31.92
12 15.037 8.14 24.30
13 -70.751 8.52 1.80809 22.8 23.58
14 -13.955 0.75 1.88300 40.8 22.77
15 49.984 0.18 22.05
16 27.024 2.89 1.66680 33.0 22.37
17 60.582 (variable) 22.04
18 -40.866 0.75 1.74320 49.3 20.97
19 55.892 2.50 1.84649 23.9 22.12
20 428.122 (variable) 22.60
21 156.571 4.56 1.77250 49.6 28.81
22 -53.135 (variable) 29.29
23 (Aperture) ∞ 1.50 29.65
24 78.366 3.87 1.53172 48.8 29.73
25 -202.387 0.40 29.51
26 128.885 6.39 1.48749 70.2 29.05
27 -33.944 1.00 1.88300 40.8 28.45
28 -312.517 36.00 28.47
29 -206.709 3.45 1.48749 70.2 26.02
30 -39.032 6.14 26.02
31 -159.177 1.00 1.83489 42.6 23.07
32 19.735 7.13 1.48749 70.2 22.99
33 -63.933 0.15 23.86
34 42.702 6.89 1.49700 81.5 25.03
35 -27.679 1.00 1.88300 40.8 25.10
36 298.737 0.30 26.10
37 50.338 6.25 1.57501 41.5 27.10
38 -32.698 4.50 27.25
39 ∞ 33.00 1.60859 46.4 40.00
40 ∞ 13.20 1.51633 64.1 40.00
41 ∞ 40.00
Image plane ∞
Various data Zoom ratio 15.02
Wide angle Medium Telephoto focal length 8.00 38.99 120.17
F number 1.90 1.90 1.93
Angle of view 34.51 8.03 2.62
Image height 5.50 5.50 5.50
Total lens length 319.12 319.12 319.12
BF 6.99 6.99 6.99
d10 0.98 37.39 47.15
d17 66.44 24.29 20.23
d20 9.00 14.56 8.31
d22 10.19 10.37 10.92
Entrance pupil position 63.01 279.97 774.78
Exit pupil position 187.26 187.26 187.26
Front principal point 71.37 327.40 975.06
Rear principal point position -1.01 -32.00 -113.17
Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 69.50 64.05 37.72 -2.23
2 11 -13.20 21.48 3.75 -10.23
3 18 -54.40 3.25 0.15 -1.62
4 21 51.60 4.56 1.94 -0.66
5 23 57.99 132.16 76.04 -57.10
(Example 3)
FIG. 9 is a lens cross-sectional view at a wide-angle end and an object distance of infinity in Example 3. In order from the object side, the first lens unit G1 having a positive refractive power that is fixed during zooming, the second lens unit G2 having a negative power that is movable during zooming, and the first lens unit G2 that is movable or fixed during zooming. The third lens group G3 includes a fourth lens group G4 having a positive refractive power that is movable during zooming, and a fifth lens group G5 having a positive refractive power that is fixed during zooming. SP is an aperture stop, P is a color separation optical prism, and IMG is an image plane.
図１０（Ａ）は実施例３の広角端で物体距離６．０ｍにおける縦収差図、図１０（Ｂ）は望遠端で物体距離６．０ｍにおける縦収差図である。図１１（Ａ）は実施例３の望遠端で無限遠物体に合焦しているときの縦収差図、図１１（Ｂ）は望遠端で至近物体に合焦しているときの縦収差図である。 FIG. 10A is a longitudinal aberration diagram at the wide-angle end of Example 3 at an object distance of 6.0 m, and FIG. 10B is a longitudinal aberration diagram at the telephoto end at an object distance of 6.0 m. FIG. 11A is a longitudinal aberration diagram when focusing on an object at infinity at the telephoto end in Example 3, and FIG. 11B is a longitudinal aberration diagram when focusing on a close object at the telephoto end. It is.
本実施例の各条件式対応値を表１に示す。本数値実施例はいずれの条件式も満足しており、物体距離至近側における変倍比低下を抑制しながら、良好な光学性能を達成している。 Table 1 shows values corresponding to the conditional expressions of this example. This numerical example satisfies all the conditional expressions, and achieves good optical performance while suppressing a reduction in zoom ratio on the object distance closest side.
（数値実施例３）
単位 mm
面データ
面番号 r d nd vd 有効径
1 3414.004 3.00 1.80610 40.9 112.56
2 198.618 1.01 112.24
3 194.852 16.03 1.43387 95.1 112.81
4 -283.430 0.58 113.03
5 181.381 12.40 1.43387 95.1 112.81
6 -1113.827 0.20 112.40
7 136.980 9.84 1.43387 95.1 108.03
8 451.022 0.20 107.08
9 100.582 5.64 1.43387 95.1 100.66
10 127.805 (可変) 99.03
11 222.102 1.00 1.88300 40.8 34.48
12 20.975 8.97 29.21
13 -42.217 0.90 1.81600 46.6 29.20
14 -275.680 0.70 30.16
15 42.781 5.45 1.80809 22.8 32.21
16 -126.877 0.16 32.06
17 1208.240 1.10 1.81600 46.6 31.50
18 67.155 (可変) 30.80
19 -52.813 1.30 1.71700 47.9 28.55
20 59.709 2.92 1.84649 23.9 30.37
21 400.114 (可変) 30.72
22 -476.592 4.72 1.60738 56.8 38.88
23 -54.642 0.15 39.47
24 51.675 8.59 1.51823 58.9 41.11
25 -85.617 0.35 40.81
26 38.995 9.65 1.48749 70.2 36.81
27 -57.561 1.50 1.83400 37.2 35.21
28 53.943 (可変) 32.46
29(絞り) ∞ 1.00 25.92
30 2760.925 3.24 1.48749 70.2 25.69
31 -49.081 1.50 1.88300 40.8 25.45
32 219.902 40.35 25.43
33 519.462 5.00 1.51742 52.4 29.25
34 -41.231 0.15 29.58
35 537.796 1.20 1.77250 49.6 29.10
36 129.740 3.99 1.51742 52.4 28.89
37 -243.972 0.40 28.64
38 48.427 7.59 1.51742 52.4 28.05
39 -40.471 1.20 1.88300 40.8 26.97
40 89.350 0.15 26.42
41 37.095 5.48 1.48749 70.2 26.47
42 -2261.197 3.80 25.79
43 ∞ 33.00 1.60859 46.4 40.00
44 ∞ 13.20 1.51680 64.2 40.00
45 ∞ 40.00
像面 ∞
各種データ
ズーム比 37.84
広角 中間 望遠
焦点距離 10.50 46.55 397.29
Fナンバー 1.99 2.00 3.58
画角 27.65 6.74 0.79
像高 5.50 5.50 5.50
レンズ全長 390.80 390.80 390.80
BF 10.00 10.00 10.00
d10 1.26 77.88 124.41
d18 130.82 32.96 10.44
d21 11.05 22.32 2.22
d28 20.09 30.05 26.14
入射瞳位置 68.26 373.08 3643.00
射出瞳位置 -1962.61 -1962.61 -1962.61
前側主点位置 78.71 418.53 3960.28
後側主点位置 -0.50 -36.55 -387.29
ズームレンズ群データ
群 始面 焦点距離 レンズ構成長 前側主点位置 後側主点位置
1 1 165.00 48.89 20.60 -12.89
2 11 -24.30 18.28 1.15 -12.93
3 19 -73.70 4.22 0.24 -2.08
4 22 43.60 24.96 -3.67 -16.67
5 29 51.54 121.25 50.21 -18.74
以上、本発明の好ましい実施例について説明したが、本発明はこれらの実施例に限定されないことは云うまでもなく、その要旨の範囲内で種々の変形及び変更が可能である。
(Numerical Example 3)
Unit mm
Surface data surface number rd nd vd Effective diameter
1 3414.004 3.00 1.80610 40.9 112.56
2 198.618 1.01 112.24
3 194.852 16.03 1.43387 95.1 112.81
4 -283.430 0.58 113.03
5 181.381 12.40 1.43387 95.1 112.81
6 -1113.827 0.20 112.40
7 136.980 9.84 1.43387 95.1 108.03
8 451.022 0.20 107.08
9 100.582 5.64 1.43387 95.1 100.66
10 127.805 (variable) 99.03
11 222.102 1.00 1.88300 40.8 34.48
12 20.975 8.97 29.21
13 -42.217 0.90 1.81600 46.6 29.20
14 -275.680 0.70 30.16
15 42.781 5.45 1.80809 22.8 32.21
16 -126.877 0.16 32.06
17 1208.240 1.10 1.81600 46.6 31.50
18 67.155 (variable) 30.80
19 -52.813 1.30 1.71700 47.9 28.55
20 59.709 2.92 1.84649 23.9 30.37
21 400.114 (variable) 30.72
22 -476.592 4.72 1.60738 56.8 38.88
23 -54.642 0.15 39.47
24 51.675 8.59 1.51823 58.9 41.11
25 -85.617 0.35 40.81
26 38.995 9.65 1.48749 70.2 36.81
27 -57.561 1.50 1.83400 37.2 35.21
28 53.943 (variable) 32.46
29 (Aperture) ∞ 1.00 25.92
30 2760.925 3.24 1.48749 70.2 25.69
31 -49.081 1.50 1.88300 40.8 25.45
32 219.902 40.35 25.43
33 519.462 5.00 1.51742 52.4 29.25
34 -41.231 0.15 29.58
35 537.796 1.20 1.77250 49.6 29.10
36 129.740 3.99 1.51742 52.4 28.89
37 -243.972 0.40 28.64
38 48.427 7.59 1.51742 52.4 28.05
39 -40.471 1.20 1.88300 40.8 26.97
40 89.350 0.15 26.42
41 37.095 5.48 1.48749 70.2 26.47
42 -2261.197 3.80 25.79
43 ∞ 33.00 1.60859 46.4 40.00
44 ∞ 13.20 1.51680 64.2 40.00
45 ∞ 40.00
Image plane ∞
Various data Zoom ratio 37.84
Wide angle Medium Telephoto focal length 10.50 46.55 397.29
F number 1.99 2.00 3.58
Angle of view 27.65 6.74 0.79
Image height 5.50 5.50 5.50
Total lens length 390.80 390.80 390.80
BF 10.00 10.00 10.00
d10 1.26 77.88 124.41
d18 130.82 32.96 10.44
d21 11.05 22.32 2.22
d28 20.09 30.05 26.14
Entrance pupil position 68.26 373.08 3643.00
Exit pupil position -1962.61 -1962.61 -1962.61
Front principal point position 78.71 418.53 3960.28
Rear principal point position -0.50 -36.55 -387.29
Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 165.00 48.89 20.60 -12.89
2 11 -24.30 18.28 1.15 -12.93
3 19 -73.70 4.22 0.24 -2.08
4 22 43.60 24.96 -3.67 -16.67
5 29 51.54 121.25 50.21 -18.74
The preferred embodiments of the present invention have been described above, but the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the gist thereof.
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、
ＳＰ 絞り、Ｇ５ 第５レンズ群、Ｐ ガラスブロック、ＩＭＧ 撮像面
G1 first lens group, G2 second lens group, G3 third lens group, G4 fourth lens group,
SP stop, G5 fifth lens group, P glass block, IMG imaging surface
Claims (3)
無限端から至近端に向けてフォーカシングを行う際、前記第２レンズ群、前記第３レンズ群、前記第４レンズ群が像側に移動し、前記第２レンズ群及び前記第３レンズ群の物体距離無限遠から至近距離にかけての繰り出し量をそれぞれｄｘ２、ｄｘ３とし、前記第２レンズ群の焦点距離をｆ２とするとき、
０．２０＜｜ｄｘ２／ｆ２｜＜０．７０
０．１５＜ｄｘ３／ｄｘ２＜２．００
であることを特徴とするズームレンズ。 In order from the object side, a first lens unit having a positive refractive power that is fixed during zooming, a second lens unit that is movable and has a negative refractive power during zooming, and a third lens having a negative refractive power that is movable or fixed during zooming. In a zoom lens composed of a fourth lens group having a positive refractive power, movable during zooming, and a fifth lens group having a positive refractive power fixed during zooming,
When performing focusing from the infinite end toward the close end, the second lens group, the third lens group, and the fourth lens group move to the image side, and the second lens group and the third lens group When the amounts of extension from the infinite object distance to the close distance are dx2 and dx3, respectively, and the focal length of the second lens group is f2,
0.20 <| dx2 / f2 | <0.70
0.15 <dx3 / dx2 <2.00
The zoom lens characterized by being.
４．０＜|ｆ１／ｆ２|＜８．０
０．８＜|ｆ１／ｆ３|＜３．０
０．８＜|ｆ１／ｆ４|＜４．５
であることを特徴とする請求項１に記載のズームレンズ。 When the focal length of the first lens group is f1, the focal length of the second lens group is f2, the focal length of the third lens group is f3, and the focal length of the fourth lens group is f4,
4.0 <| f1 / f2 | <8.0
0.8 <| f1 / f3 | <3.0
0.8 <| f1 / f4 | <4.5
The zoom lens according to claim 1, wherein:
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| Application Number | Priority Date | Filing Date | Title |
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| JP2014148421A JP2016024341A (en) | 2014-07-22 | 2014-07-22 | Zoom lens and image capturing device having the same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014148421A JP2016024341A (en) | 2014-07-22 | 2014-07-22 | Zoom lens and image capturing device having the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2016024341A true JP2016024341A (en) | 2016-02-08 |
Family
ID=55271124
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2014148421A Pending JP2016024341A (en) | 2014-07-22 | 2014-07-22 | Zoom lens and image capturing device having the same |
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| Country | Link |
|---|---|
| JP (1) | JP2016024341A (en) |
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| CN108398773A (en) * | 2017-02-08 | 2018-08-14 | 佳能株式会社 | Zoom lens and image pick-up device with zoom lens |
| JP2018132731A (en) * | 2017-02-17 | 2018-08-23 | 富士フイルム株式会社 | Zoom lens and imaging apparatus |
| CN109425973A (en) * | 2017-08-22 | 2019-03-05 | 富士胶片株式会社 | Zoom lens and photographic device |
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| JPWO2021131370A1 (en) * | 2019-12-23 | 2021-07-01 | ||
| CN113341550A (en) * | 2021-07-29 | 2021-09-03 | 成都极米科技股份有限公司 | Zoom lens applied to projection |
| WO2025203893A1 (en) * | 2024-03-27 | 2025-10-02 | キヤノン株式会社 | Zoom lens and imaging device |
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2014
- 2014-07-22 JP JP2014148421A patent/JP2016024341A/en active Pending
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| CN108398773B (en) * | 2017-02-08 | 2021-04-09 | 佳能株式会社 | Zoom lens and image pickup apparatus having the same |
| EP3361301A1 (en) * | 2017-02-08 | 2018-08-15 | Canon Kabushiki Kaisha | Zoom lens and image pickup apparatus having the same |
| CN108398773A (en) * | 2017-02-08 | 2018-08-14 | 佳能株式会社 | Zoom lens and image pick-up device with zoom lens |
| US10670845B2 (en) | 2017-02-08 | 2020-06-02 | Canon Kabushiki Kaisha | Zoom lens and image pickup apparatus having the same |
| JP2018132731A (en) * | 2017-02-17 | 2018-08-23 | 富士フイルム株式会社 | Zoom lens and imaging apparatus |
| CN109425973A (en) * | 2017-08-22 | 2019-03-05 | 富士胶片株式会社 | Zoom lens and photographic device |
| CN109425973B (en) * | 2017-08-22 | 2022-02-25 | 富士胶片株式会社 | Zoom lens and imaging device |
| JP2020106577A (en) * | 2018-12-26 | 2020-07-09 | キヤノン株式会社 | Zoom lens and image capturing device |
| JPWO2021131370A1 (en) * | 2019-12-23 | 2021-07-01 | ||
| CN115151852A (en) * | 2019-12-23 | 2022-10-04 | 株式会社尼康 | Variable magnification optical system, optical apparatus, and method for manufacturing variable magnification optical system |
| JP7322974B2 (en) | 2019-12-23 | 2023-08-08 | 株式会社ニコン | Variable Magnification Optical System and Optical Equipment |
| CN115151852B (en) * | 2019-12-23 | 2023-10-03 | 株式会社尼康 | Variable magnification optical systems and optical equipment |
| CN113341550A (en) * | 2021-07-29 | 2021-09-03 | 成都极米科技股份有限公司 | Zoom lens applied to projection |
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| WO2025203893A1 (en) * | 2024-03-27 | 2025-10-02 | キヤノン株式会社 | Zoom lens and imaging device |
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