JP2016024340A - Zoom lens and image capturing device having the same - Google Patents

Zoom lens and image capturing device having the same Download PDF

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JP2016024340A
JP2016024340A JP2014148420A JP2014148420A JP2016024340A JP 2016024340 A JP2016024340 A JP 2016024340A JP 2014148420 A JP2014148420 A JP 2014148420A JP 2014148420 A JP2014148420 A JP 2014148420A JP 2016024340 A JP2016024340 A JP 2016024340A
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lens
refractive power
zoom
distance
zooming
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毅 若園
Takeshi Wakazono
毅 若園
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キヤノン株式会社
Canon Inc
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Abstract

PROBLEM TO BE SOLVED: To provide a zoom lens that has a wide view angle and high magnification, features both reduced size/weight and a high performance, and offers suppressed reduction in a zoom ratio when focusing on proximity, and to provide an image capturing device having the same.SOLUTION: A zoom lens comprises a first lens group that is stationary while zooming and has positive refractive power, a second lens group that is movable while zooming and has negative refractive power, a third lens group that is movable while zooming and has negative refractive power, and a fourth lens group that is stationary while zooming and has positive refractive power. Focusing is done over an object distance range of infinity to proximity by moving the second lens group and third lens group toward the object side. The zoom lens satisfies conditional expressions below.SELECTED DRAWING: 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(例えば半画角35度〜45度程度)、高倍率(例えば20〜40倍程度)、小型軽量且つ高性能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, as a zoom lens, it relates to a zoom lens suitable for a TV camera, a video camera, a photographic camera, and a digital camera. The present invention relates to a compact, lightweight and high-performance zoom lens.
従来のテレビカメラ用の所謂4群ズームレンズにおいて、広角、高倍率且つ高性能を達成するための構成として、例えば特許文献1では、第1レンズ群を物体側から順に負レンズ群G11、第1の正レンズ群G12、第2の正レンズ群G13に分割し、第1の正レンズ群G12を光軸上で移動することにより、フォーカシングを行うインナーフォーカス式のズームレンズが提案されている(特許文献1)。   As a configuration for achieving a wide angle, high magnification, and high performance in a so-called four-group zoom lens for a conventional television camera, for example, in Patent Document 1, the first lens group is arranged in order from the object side to the negative lens group G11, the first lens group. An inner focus type zoom lens that performs focusing by dividing the first positive lens group G12 into a second positive lens group G13 and moving the first positive lens group G12 on the optical axis has been proposed (patent). Reference 1).
また、近年において第1レンズ群以外でフォーカシングを行う所謂リヤフォーカス方式のズームレンズが種々提案されている(特許文献2、3)。特許文献2では、正の屈折力の第1レンズ群、変倍用に移動の負の屈折力の第2レンズ群、変倍用の負の屈折力の第3レンズ群、変倍に伴って変動する像面を補正するための正の屈折力を有する第4レンズ群、結像用の正の屈折力を有する第5レンズ群において、第4レンズ群でフォーカシングを行う方式が提案されている。   In recent years, various so-called rear focus zoom lenses that perform focusing other than the first lens group have been proposed (Patent Documents 2 and 3). In Patent Document 2, a first lens group having a positive refractive power, a second lens group having a negative refractive power moved for zooming, a third lens group having a negative refractive power for zooming, and accompanying the zooming In the fourth lens group having positive refracting power for correcting the fluctuating image surface and the fifth lens group having positive refracting power for imaging, a method of performing focusing with the fourth lens group has been proposed. .
特許文献3では、正の屈折力の第1レンズ群、変倍用に移動の負の屈折力の第2レンズ群、負の屈折力の第3レンズ群、変倍に伴って変動する像面を補正するための正の屈折力を有する第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、第2レンズ群と第4レンズ群でフォーカシングを行う方式が提案されている。   In Patent Document 3, a first lens group having a positive refractive power, a second lens group having a negative refractive power moved for zooming, a third lens group having a negative refractive power, and an image plane that varies with zooming. A fourth lens group having a positive refractive power for correcting light and a fifth lens group having a positive refractive power for image formation, and a method of performing focusing with the second lens group and the fourth lens group has been proposed. ing.
特開2005−227494号公報JP 2005-227494 A 特開2011−107693号公報JP 2011-107693 A 特開平09−15495号公報Japanese Patent Laid-Open No. 09-15495
特許文献1においては第1レンズ群の枚数が12枚と多く、小型軽量化に課題があった。特許文献2、3においては、第1レンズ群がフォーカシングにおいて固定であるため、第1レンズ群の構成が簡略化でき、小型軽量化が可能となるが、第4レンズ群でフォーカシングを行う場合、望遠側、至近側において変倍比が低下してしまう課題があった。   In Patent Document 1, the number of first lens units is as large as 12, and there is a problem in reducing the size and weight. In Patent Documents 2 and 3, since the first lens group is fixed in focusing, the configuration of the first lens group can be simplified and the size and weight can be reduced. However, when focusing with the fourth lens group, There has been a problem that the zoom ratio decreases on the telephoto side and the close side.
特許文献3においては、至近距離における変倍比が物体距離無限遠における変倍比と同一となるように第4レンズ群の繰り出しに連動して第2レンズ群を像側に繰り出しているが、至近距離でのフォーカシングによる収差変動が増大するという課題があった。   In Patent Document 3, the second lens group is extended toward the image side in conjunction with the extension of the fourth lens group so that the zoom ratio at the closest distance is the same as the zoom ratio at infinity at the object distance. There has been a problem that aberration fluctuation due to focusing at a close distance increases.
そこで、本発明の目的は、4群ズームレンズにおいて、第1レンズ群がフォーカシングにおいて固定であり、第2レンズ群、第3レンズ群でフォーカシングを行い、第2レンズ群、第3レンズ群の繰り出し量を規定することで、第1レンズ群の枚数が6〜8枚と少なく、広角、高倍率小型軽量、高性能且つ至近距離における変倍比の低下が少ない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。   Accordingly, an object of the present invention is to focus the second lens group and the third lens group in the four-group zoom lens, in which the first lens group is fixed during focusing, and to extend the second lens group and the third lens group. By defining the amount, a zoom lens having a small number of first lens groups of 6 to 8, a wide angle, a high magnification, a small size, a high performance, and a low zoom ratio at a close distance, and an image pickup apparatus having the same Is to provide.
上記目的を達成するために、本発明の構成は、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、変倍に際し可動で負の屈折力の第2レンズ群、変倍に際し可動で負の屈折力の第3レンズ群、変倍中固定で正の屈折力の第4レンズ群から構成されるズームレンズにおいて、
前記第2レンズ群、前記第3レンズ群が物体距離無限遠から至近端にかけて繰り出すことによりフォーカシングを行い、前記第2レンズ群及び前記第3レンズ群の望遠端、至近端における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、
0.08<|dx2/f2|<0.70
−1.50<dx2/dx3<−0.08
であることを特徴とする。
In order to achieve the above object, the configuration of the present invention includes, 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 refractive power that is movable during zooming, In a zoom lens composed of a third lens unit having a negative refractive power that is movable during magnification and a fourth lens unit having a positive refractive power that is fixed during zooming,
The second lens group and the third lens group perform focusing by extending from the infinite object distance to the close end, and the payout amounts at the telephoto end and the close end of the second lens group and the third lens group are respectively set. When dx2 and dx3 and the focal length of the second lens group is f2,
0.08 <| dx2 / f2 | <0.70
-1.50 <dx2 / dx3 <-0.08
It is characterized by being.
本発明の更なる目的又はその他の特徴は、以下、添付の図面を参照して説明される好ましい実施例等によって明らかにされるであろう。   Further objects and other features of the present invention will be made clear by the preferred embodiments described below with reference to the accompanying drawings.
本発明によれば、4群ズームレンズにおいて、第1レンズ群がフォーカシングにおいて固定であり、第2レンズ群、第3レンズ群でフォーカシングを行い、第2レンズ群、第3レンズ群の繰り出し量を規定することで、第1レンズ群の枚数が6〜8枚と少なく、広角、高倍率小型軽量、高性能且つ至近距離における変倍比の低下が少ない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, in the four-group zoom lens, the first lens group is fixed during focusing, the second lens group and the third lens group perform focusing, and the extension amounts of the second lens group and the third lens group are set. By defining the zoom lens, there are provided a zoom lens having a small number of first lens groups of 6 to 8, a wide angle, a high magnification and a light weight, a high performance and a low zoom ratio at a close distance, and an image pickup apparatus having the zoom lens. be able to.
本発明のズームレンズの概略構成と移動軌跡Schematic configuration and movement locus of zoom lens of the present invention 本発明の撮像装置Imaging device of the present invention 実施例1の広角端のレンズ断面図Cross-sectional view of the lens at the wide-angle end in Example 1 実施例1の広角端、物体距離無限での収差図Aberration diagram of Example 1 at the wide-angle end and infinite object distance 実施例1の望遠端、物体距離無限での収差図Aberration diagram at Example 1 with the telephoto end and the object distance infinite 実施例1の望遠端、至近距離(0.6m)での収差図Aberration diagram at telephoto end and close distance (0.6 m) in Example 1 実施例2の広角端のレンズ断面図である。6 is a lens cross-sectional view at a wide angle end according to Embodiment 2. FIG. 実施例2の広角端、物体距離無限での収差図Aberration diagram of Example 2 at the wide-angle end and infinite object distance 実施例2の望遠端、物体距離無限での収差図Aberration diagram of Example 2 at the telephoto end with an infinite object distance 実施例2の望遠端、至近距離(0.6m)での収差図Aberration diagram at telephoto end and close distance (0.6 m) in Example 2 実施例3の広角端のレンズ断面図である。6 is a lens cross-sectional view at a wide angle end according to Embodiment 3. FIG. 実施例3の広角端、物体距離無限での収差図Aberration diagram of Example 3 at the wide-angle end and infinite object distance 実施例3の望遠端、物体距離無限での収差図Aberration diagram at telephoto end and object distance infinite in Example 3 実施例3の望遠端、至近距離(0.6m)での収差図Aberration diagram at telephoto end and close distance (0.6 m) in Example 3
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表している。   Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows the configuration of the zoom lens according to the present invention and the movement locus of each lens group associated with zooming and focusing.
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、変倍用の負の屈折力の第2レンズ群G2、像面補正用の負の屈折力の第3レンズ群G3、変倍中固定の正の屈折力を有する第4レンズ群G4から構成されている。尚、SPは絞り、IMGは撮像面を表している。第2レンズ群G2、第3レンズ群G3の物体距離無限遠における移動軌跡を実線で、至近端における移動軌跡を点線で示している。物体距離無限遠から至近端に掛けて、第2レンズ群G2は像側に繰り出し、第3レンズ群G3は物体側に繰り出す。繰り出し量は望遠端で最大となる。   In order from the object side, a first lens group G1 having a positive refractive power that is fixed during zooming, a second lens group G2 having a negative refractive power for zooming, and a third lens group having a negative refractive power for correcting the image plane G3 is composed of a fourth lens group G4 having a positive refractive power fixed during zooming. Note that SP represents an aperture, and IMG represents an imaging surface. The movement trajectories at the object distance infinity of the second lens group G2 and the third lens group G3 are indicated by solid lines, and the movement trajectories at the closest end are indicated by dotted lines. The second lens group G2 extends toward the image side and the third lens group G3 extends toward the object side from the infinite object distance to the closest end. The feeding amount is maximum at the telephoto end.
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レンズ群を含む変倍部(兼フォーカス部)115、結像用の第4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4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 and third lens groups that move on the optical axis during zooming and focusing, and a fourth lens group 116 for image formation. Have. SP is an aperture stop. The fourth 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、変倍用の負の屈折力の第2レンズ群G2、像面補正用の負の屈折力の第3レンズ群G3、変倍中固定で正の屈折力の第4レンズ群G4から構成されている。本実施例では、物体距離無限遠から至近端に掛けて第2レンズ群G2を像側に、第3レンズ群G3を物体側に繰り出すことによりフォーカシングを行なっている。SPは絞り、Pは色分解光学系、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. FIG. 3 is a lens cross-sectional view of the first embodiment at the wide-angle end and at an object distance of infinity. In order from the object side, a first lens unit having a positive refractive power that is fixed during zooming, a second lens unit G2 having a negative refractive power for zooming, and a third lens unit G3 having a negative refractive power for correcting image plane The fourth lens unit G4 is fixed during zooming and has a positive refractive power. In this embodiment, focusing is performed by extending the second lens group G2 toward the image side and the third lens group G3 toward the object side from the infinite object distance to the closest end. SP is a stop, P is a color separation optical system, and IMG is an image plane.
第2レンズ群の望遠端、至近端における繰り出し量を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。
0.08<|dx2/f2|<0.70 ・・・(1)
条件式(1)は、第2レンズ群の望遠端、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、至近距離での収差変動が増大し、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。
When the amount of extension at the telephoto end and the close end of the second lens group is dx2, and the focal length of the second lens group is f2, conditional expression (1) is satisfied.
0.08 <| dx2 / f2 | <0.70 (1)
Conditional expression (1) defines the range of the feed amount dx2 at the telephoto end and the close 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 the conditional expression (1) is exceeded, the zoom ratio at the closest end with respect to the object distance at infinity becomes too large, aberration fluctuations at the close distance increase, and correction becomes difficult. 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、
0.10<|dx2/f2|<0.52 ・・・(1a)
を満足すると更に好ましい。
Conditional expression (1) is
0.10 <| dx2 / f2 | <0.52 (1a)
Is more preferable.
また、第3レンズ群の望遠端、至近端における繰り出し量をdx3とするとき、条件式(2)を満足する。
−1.50<dx2/dx3<−0.08 ・・・(2)
条件式(2)は、第3レンズ群の望遠端、至近端における繰り出し量dx3に対する第2レンズ群の望遠端、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。条件式(2)の上限を上回ると、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。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。また、第2レンズ群と第3レンズ群の繰り出し量の総和が増大し、繰り出しのためのデッドスペースが増大するため小型軽量化が困難となる。
Further, when the amount of extension at the telephoto end and the close end of the third lens group is dx3, the conditional expression (2) is satisfied.
-1.50 <dx2 / dx3 <-0.08 (2)
Conditional expression (2) defines the range of the extension amount dx2 at the telephoto end and the close end of the second lens group with respect to the extension amount dx3 at the telephoto end and the close end of the third lens group. If the upper limit of conditional expression (2) is exceeded, the reduction in the zoom ratio at a close distance becomes remarkable, which is unacceptable. 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. In addition, the total amount of extension of the second lens group and the third lens group increases, and the dead space for extension increases, making it difficult to reduce the size and weight.
尚、条件式(2)は、
−0.90<dx3/dx2<−0.12 ・・・(2a)
を満足すると更に好ましい。
Conditional expression (2) is
−0.90 <dx3 / dx2 <−0.12 (2a)
Is more preferable.
また、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とするとき、条件式(3)〜(4)を満足する。
3.0<|f1/f2|<6.0 ・・・(3)
0.5<|f1/f3|<2.8 ・・・(4)
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。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。
When the focal length of the first lens group is f1, the focal length of the second lens group is f2, and the focal length of the third lens group is f3, the conditional expressions (3) to (4) are satisfied.
3.0 <| f1 / f2 | <6.0 (3)
0.5 <| f1 / f3 | <2.8 (4)
The refractive power of each lens group is defined by the reciprocal of the focal length of each lens group. 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、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 (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, 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)は、
3.5<|f1/f2|<5.5 ・・・(3a)
1.2<|f1/f3|<1.8 ・・・(4a)
を満足すると更に好ましい。
Conditional expressions (3) and (4) are
3.5 <| f1 / f2 | <5.5 (3a)
1.2 <| f1 / f3 | <1.8 (4a)
Is more preferable.
また、第1レンズ群の後側主点位置をOk1‘、第1レンズ群の全長をD1とするとき、条件式(5)を満足する。
1<Ok1‘/D1<0.3 ・・・(5)
尚、第1レンズ群の後側主点位置Ok1‘は、第1レンズ群最終面の頂点から後側主点位置までの距離とし、物体側から像側を正の方向として定義する。また、第1レンズ群の全長D1は、第1レンズ群の最も物体側の面の頂点から第1レンズ群最終面の頂点までの長さとする。
Further, when the rear principal point position of the first lens group is Ok1 ′ and the total length of the first lens group is D1, the conditional expression (5) is satisfied.
1 <Ok1 ′ / D1 <0.3 (5)
The rear principal point position Ok1 ′ of the first lens group is defined as the distance from the vertex of the final surface of the first lens group to the rear principal point position, and the image side to the image side is defined as the positive direction. The total length D1 of the first lens group is the length from the vertex of the most object side surface of the first lens group to the vertex of the final surface of the first lens group.
条件式(5)の上限を上回ると、第1レンズ群の後側主点位置をより像側に配置するために第1レンズ群内の各レンズの屈折力が増大し、諸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、広角側における第1レンズ群への軸外光線入射高さが増大し、第1レンズ群の有効径が増大するため、小型軽量化が困難となる。   If the upper limit of conditional expression (5) is exceeded, the refractive power of each lens in the first lens group increases in order to place the rear principal point position of the first lens group closer to the image side, and variations in various aberrations occur. Increases and makes correction difficult. If the lower limit of conditional expression (5) is not reached, the off-axis ray incident height on the first lens group on the wide angle side increases and the effective diameter of the first lens group increases, making it difficult to reduce the size and weight.
また、広角端焦点距離をfw、撮像素子の有効径をISとしたとき、条件式(6)を満足する。
0.7<D1×fw/(f1×IS)< 1.4 ・・・(6)
条件式(6)の上限を上回ると、第1レンズ群の全長D1が増大し、小型軽量化が困難となる。条件式(6)の下限を下回ると、第1レンズ群内の各レンズの屈折力が増大し、諸収差の補正が困難となる。
Further, when the wide-angle end focal length is fw and the effective diameter of the image sensor is IS, the conditional expression (6) is satisfied.
0.7 <D1 × fw / (f1 × IS) <1.4 (6)
If the upper limit of conditional expression (6) is exceeded, the total length D1 of the first lens group will increase, making it difficult to reduce the size and weight. If the lower limit of conditional expression (6) is not reached, the refractive power of each lens in the first lens group will increase, making it difficult to correct various aberrations.
図4aは実施例1の広角端、物体距離無限遠における縦収差図、図4bは望遠端、物体距離無限遠における縦収差図、図4cは望遠端、至近端0.6mにおける縦収差図である。球面収差は0.4mm、非点収差は0.4mm、歪曲は5%、倍率色収差は、0.05mmのスケールで描かれている。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。   4a is a longitudinal aberration diagram at the wide-angle end and at an object distance of infinity in Example 1, FIG. 4b is a longitudinal aberration diagram at the telephoto end and at an object distance of infinity, and FIG. 4c is a longitudinal aberration diagram at the telephoto end and the near end of 0.6m. It is. The spherical aberration is 0.4 mm, the astigmatism is 0.4 mm, the distortion is 5%, and the lateral chromatic aberration is drawn on a scale of 0.05 mm. 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 (°).
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はアッベ数を示している。   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, and νd is an Abbe number.

(数値実施例1)
単位 mm

面データ
面番号 r d nd vd 有効径
1 1336.314 5.30 1.72916 54.7 171.65
2 119.524 44.96 147.07
3 -583.132 4.80 1.61800 63.3 139.97
4 3217.680 5.85 140.77
5 -5316.864 17.32 1.43387 95.1 142.60
6 -207.910 1.20 144.00
7 143.829 29.95 1.43387 95.1 147.17
8 -524.659 0.20 146.22
9 132.827 4.50 1.80518 25.4 138.15
10 100.278 6.11 131.37
11 125.980 28.31 1.49700 81.5 131.37
12 -450.179 0.20 129.45
13 152.316 10.29 1.59240 68.3 116.95
14 429.217 (可変) 115.00
15 77.487 2.50 2.00330 28.3 42.67
16 21.841 9.82 33.56
17 -89.033 2.00 2.00330 28.3 33.42
18 122.898 0.20 33.48
19 39.808 7.90 1.92286 18.9 34.39
20 -74.813 1.57 33.77
21 -44.124 2.00 1.72916 54.7 33.52
22 107.099 (可変) 32.19
23 -51.686 2.00 1.78590 44.2 30.56
24 50.553 4.82 1.84666 23.8 33.18
25 1467.999 (可変) 33.87
26(絞り) ∞ 2.00 36.16
27 215.545 5.91 1.62041 60.3 38.00
28 -75.689 0.20 38.80
29 56.115 11.18 1.51633 64.1 39.97
30 -42.364 2.00 1.88300 40.8 39.61
31 -713.352 60.00 40.24
32 121.648 2.50 1.88300 40.8 48.35
33 52.004 14.54 1.50137 56.4 47.64
34 -50.232 17.22 47.93
35 65.232 11.83 1.49700 81.5 37.26
36 -40.541 2.00 1.88300 40.8 35.28
37 267.087 0.20 35.01
38 30.898 6.26 1.62041 60.3 35.20
39 64.599 14.40 33.75
40 ∞ 33.00 1.60859 46.4 40.00
41 ∞ 13.20 1.51633 64.2 40.00
42 ∞ 40.00
像面 ∞

各種データ
ズーム比 25.00

焦点距離 7.00 15.68 35.00 91.00 175.00
Fナンバー 1.70 1.70 1.70 1.70 1.95
画角 38.16 19.33 8.93 3.46 1.80
像高 5.50 5.50 5.50 5.50 5.50
レンズ全長 540.10 540.10 540.10 540.10 540.10
BF 10.00 10.00 10.00 10.00 10.00

d14 1.51 50.35 80.50 100.99 108.52
d22 136.73 83.01 49.22 30.36 31.23
d25 3.60 8.49 12.12 10.49 2.09

入射瞳位置 102.43 182.70 329.79 678.17 1093.39
射出瞳位置 190.29 190.29 190.29 190.29 190.29
前側主点位置 109.70 199.74 371.59 815.11 1438.26
後側主点位置 3.00 -5.68 -25.00 -81.00 -165.00

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 1 113.00 159.00 103.53 27.74
2 15 -23.19 25.99 4.93 -12.07
3 23 -68.52 6.82 0.05 -3.66
4 26 93.36 196.44 124.54 -182.58

本実施例の各条件式対応値を表1に示す。

(Numerical example 1)
Unit mm

Surface data surface number rd nd vd Effective diameter
1 1336.314 5.30 1.72916 54.7 171.65
2 119.524 44.96 147.07
3 -583.132 4.80 1.61800 63.3 139.97
4 3217.680 5.85 140.77
5 -5316.864 17.32 1.43387 95.1 142.60
6 -207.910 1.20 144.00
7 143.829 29.95 1.43387 95.1 147.17
8 -524.659 0.20 146.22
9 132.827 4.50 1.80518 25.4 138.15
10 100.278 6.11 131.37
11 125.980 28.31 1.49700 81.5 131.37
12 -450.179 0.20 129.45
13 152.316 10.29 1.59240 68.3 116.95
14 429.217 (variable) 115.00
15 77.487 2.50 2.00330 28.3 42.67
16 21.841 9.82 33.56
17 -89.033 2.00 2.00330 28.3 33.42
18 122.898 0.20 33.48
19 39.808 7.90 1.92286 18.9 34.39
20 -74.813 1.57 33.77
21 -44.124 2.00 1.72916 54.7 33.52
22 107.099 (variable) 32.19
23 -51.686 2.00 1.78590 44.2 30.56
24 50.553 4.82 1.84666 23.8 33.18
25 1467.999 (variable) 33.87
26 (Aperture) ∞ 2.00 36.16
27 215.545 5.91 1.62041 60.3 38.00
28 -75.689 0.20 38.80
29 56.115 11.18 1.51633 64.1 39.97
30 -42.364 2.00 1.88300 40.8 39.61
31 -713.352 60.00 40.24
32 121.648 2.50 1.88300 40.8 48.35
33 52.004 14.54 1.50137 56.4 47.64
34 -50.232 17.22 47.93
35 65.232 11.83 1.49700 81.5 37.26
36 -40.541 2.00 1.88300 40.8 35.28
37 267.087 0.20 35.01
38 30.898 6.26 1.62041 60.3 35.20
39 64.599 14.40 33.75
40 ∞ 33.00 1.60859 46.4 40.00
41 ∞ 13.20 1.51633 64.2 40.00
42 ∞ 40.00
Image plane ∞

Various data Zoom ratio 25.00

Focal length 7.00 15.68 35.00 91.00 175.00
F number 1.70 1.70 1.70 1.70 1.95
Angle of view 38.16 19.33 8.93 3.46 1.80
Image height 5.50 5.50 5.50 5.50 5.50
Total lens length 540.10 540.10 540.10 540.10 540.10
BF 10.00 10.00 10.00 10.00 10.00

d14 1.51 50.35 80.50 100.99 108.52
d22 136.73 83.01 49.22 30.36 31.23
d25 3.60 8.49 12.12 10.49 2.09

Entrance pupil position 102.43 182.70 329.79 678.17 1093.39
Exit pupil position 190.29 190.29 190.29 190.29 190.29
Front principal point position 109.70 199.74 371.59 815.11 1438.26
Rear principal point position 3.00 -5.68 -25.00 -81.00 -165.00

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 113.00 159.00 103.53 27.74
2 15 -23.19 25.99 4.93 -12.07
3 23 -68.52 6.82 0.05 -3.66
4 26 93.36 196.44 124.54 -182.58

Table 1 shows values corresponding to the conditional expressions of this example.
数値実施例1において、いずれの条件式も満足しており、広角端半画角38.2度、変倍比25倍を達成している。また、望遠端、至近端0.6mにおける変倍比15倍を達成しており、至近距離における変倍比の低下を抑制している。また、第1レンズ群のレンズ枚数は7枚であり、少ないレンズ枚数で高仕様、高性能を達成している。   In Numerical Example 1, all the conditional expressions are satisfied, and the wide angle end half angle of view is 38.2 degrees and the zoom ratio is 25 times. In addition, the zoom ratio at the telephoto end and the close end of 0.6 m is 15 times, and the reduction of the zoom ratio at the close distance is suppressed. The number of lenses in the first lens group is 7, and high specifications and high performance are achieved with a small number of lenses.
(実施例2)
図5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、変倍用の負の屈折力の第2レンズ群G2、像面補正用の負の屈折力の第3レンズ群G3、変倍中固定で正の屈折力の第4レンズ群G4から構成されている。本実施例では、物体距離無限遠から至近に掛けて第2レンズ群G2を像側に、第3レンズ群G3を物体側に繰り出すことによりフォーカシングを行なっている。SPは絞り、Pは色分解光学系、IMGは結像面である。
(Example 2)
FIG. 5 is a lens cross-sectional view at a wide-angle end and an object distance of infinity in Example 2. In order from the object side, a first lens unit having a positive refractive power that is fixed during zooming, a second lens unit G2 having a negative refractive power for zooming, and a third lens unit G3 having a negative refractive power for correcting image plane The fourth lens unit G4 is fixed during zooming and has a positive refractive power. In this embodiment, focusing is performed by extending the second lens group G2 to the image side and the third lens group G3 to the object side from the infinite distance to the object distance. SP is a stop, P is a color separation optical system, and IMG is an image plane.
図6aは実施例2の広角端、物体距離無限遠における縦収差図、図6bは望遠端、物体距離無限遠における縦収差図、図6cは望遠端、至近端0.6mにおける縦収差図である。   6a is a longitudinal aberration diagram at the wide-angle end and at an object distance of infinity in Example 2, FIG. 6b is a longitudinal aberration diagram at the telephoto end and at an object distance of infinity, and FIG. 6c is a longitudinal aberration diagram at the telephoto end and the near end of 0.6m. It is.

(数値実施例2)
単位 mm

面データ
面番号 r d nd vd 有効径
1 -1229.859 5.10 1.77250 49.6 153.33
2 109.663 43.22 132.31
3 152.764 30.88 1.49700 81.5 139.60
4 -261.360 0.20 139.36
5 175.372 4.80 1.72047 34.7 131.14
6 100.939 3.09 123.89
7 114.277 27.35 1.43875 94.9 123.93
8 -472.027 0.20 123.22
9 195.140 19.85 1.43875 94.9 118.86
10 -319.130 0.20 116.68
11 105.961 7.37 1.61800 63.3 101.61
12 173.663 (可変) 100.25
13 49.640 2.50 2.00330 28.3 41.01
14 19.191 10.60 31.61
15 -66.386 2.00 2.00330 28.3 31.40
16 95.568 0.20 31.43
17 37.122 8.26 1.92286 18.9 32.36
18 -52.436 2.29 31.77
19 -35.245 2.00 1.88300 40.8 29.09
20 179.585 (可変) 28.29
21 -47.452 2.00 1.78590 44.2 29.66
22 55.031 4.60 1.84666 23.8 32.38
23 -2760.561 (可変) 33.14
24(絞り) ∞ 2.00 35.53
25 239.339 6.50 1.62041 60.3 37.40
26 -58.183 0.20 38.26
27 64.263 10.16 1.48749 70.2 39.07
28 -44.191 2.00 1.88300 40.8 38.73
29 -212.457 65.00 39.33
30 302.949 2.50 1.88300 40.8 41.84
31 59.143 11.53 1.50137 56.4 41.59
32 -45.113 10.08 41.94
33 59.046 9.06 1.49700 81.5 36.23
34 -46.000 2.00 1.88300 40.8 35.44
35 343.240 0.20 35.11
36 31.910 5.31 1.62041 60.3 35.06
37 64.403 14.40 33.92
38 ∞ 33.00 1.60859 46.4 40.00
39 ∞ 13.20 1.51633 64.2 40.00
40 ∞ 40.00
像面 ∞

各種データ
ズーム比 25.00

焦点距離 7.00 15.68 35.00 91.00 175.00
Fナンバー 1.70 1.70 1.70 1.70 2.20
画角 38.16 19.33 8.93 3.46 1.80
像高 5.50 5.50 5.50 5.50 5.50
レンズ全長 494.11 494.11 494.11 494.11 494.11
BF 10.00 10.00 10.00 10.00 10.00

d12 1.59 43.95 70.09 87.96 94.54
d20 115.21 67.67 37.59 21.42 23.75
d23 3.46 8.65 12.59 10.89 1.97

入射瞳位置 89.79 160.67 289.18 590.17 946.69
射出瞳位置 154.89 154.89 154.89 154.89 154.89
前側主点位置 97.13 178.05 332.63 738.33 1333.06
後側主点位置 3.00 -5.68 -25.00 -81.00 -165.00

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 99.23 142.27 89.73 25.67
2 13 -20.09 27.85 6.69 -11.10
3 21 -66.13 6.60 -0.16 -3.76
4 24 107.61 187.13 151.43 -217.04

本実施例の各条件式対応値を表1に示す。

(Numerical example 2)
Unit mm

Surface data surface number rd nd vd Effective diameter
1 -1229.859 5.10 1.77250 49.6 153.33
2 109.663 43.22 132.31
3 152.764 30.88 1.49700 81.5 139.60
4 -261.360 0.20 139.36
5 175.372 4.80 1.72047 34.7 131.14
6 100.939 3.09 123.89
7 114.277 27.35 1.43875 94.9 123.93
8 -472.027 0.20 123.22
9 195.140 19.85 1.43875 94.9 118.86
10 -319.130 0.20 116.68
11 105.961 7.37 1.61800 63.3 101.61
12 173.663 (variable) 100.25
13 49.640 2.50 2.00330 28.3 41.01
14 19.191 10.60 31.61
15 -66.386 2.00 2.00330 28.3 31.40
16 95.568 0.20 31.43
17 37.122 8.26 1.92286 18.9 32.36
18 -52.436 2.29 31.77
19 -35.245 2.00 1.88300 40.8 29.09
20 179.585 (variable) 28.29
21 -47.452 2.00 1.78590 44.2 29.66
22 55.031 4.60 1.84666 23.8 32.38
23 -2760.561 (variable) 33.14
24 (Aperture) ∞ 2.00 35.53
25 239.339 6.50 1.62041 60.3 37.40
26 -58.183 0.20 38.26
27 64.263 10.16 1.48749 70.2 39.07
28 -44.191 2.00 1.88300 40.8 38.73
29 -212.457 65.00 39.33
30 302.949 2.50 1.88300 40.8 41.84
31 59.143 11.53 1.50137 56.4 41.59
32 -45.113 10.08 41.94
33 59.046 9.06 1.49700 81.5 36.23
34 -46.000 2.00 1.88300 40.8 35.44
35 343.240 0.20 35.11
36 31.910 5.31 1.62041 60.3 35.06
37 64.403 14.40 33.92
38 ∞ 33.00 1.60859 46.4 40.00
39 ∞ 13.20 1.51633 64.2 40.00
40 ∞ 40.00
Image plane ∞

Various data Zoom ratio 25.00

Focal length 7.00 15.68 35.00 91.00 175.00
F number 1.70 1.70 1.70 1.70 2.20
Angle of view 38.16 19.33 8.93 3.46 1.80
Image height 5.50 5.50 5.50 5.50 5.50
Total lens length 494.11 494.11 494.11 494.11 494.11
BF 10.00 10.00 10.00 10.00 10.00

d12 1.59 43.95 70.09 87.96 94.54
d20 115.21 67.67 37.59 21.42 23.75
d23 3.46 8.65 12.59 10.89 1.97

Entrance pupil position 89.79 160.67 289.18 590.17 946.69
Exit pupil position 154.89 154.89 154.89 154.89 154.89
Front principal point position 97.13 178.05 332.63 738.33 1333.06
Rear principal point position 3.00 -5.68 -25.00 -81.00 -165.00

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 99.23 142.27 89.73 25.67
2 13 -20.09 27.85 6.69 -11.10
3 21 -66.13 6.60 -0.16 -3.76
4 24 107.61 187.13 151.43 -217.04

Table 1 shows values corresponding to the conditional expressions of this example.
数値実施例2において、いずれの条件式も満足しており、広角端半画角38.2度、変倍比25倍を達成している。また、望遠端、至近端0.6mにおける変倍比11倍を達成しており、至近距離における変倍の低下を抑制している。また、第1レンズ群のレンズ枚数は6枚であり、少ないレンズ枚数で高仕様、高性能を達成している。   In Numerical Example 2, all the conditional expressions are satisfied, and the wide angle end half angle of view is 38.2 degrees and the zoom ratio is 25 times. In addition, the zoom ratio at the telephoto end and the close end of 0.6 m is 11 times, and the reduction in zooming at the close distance is suppressed. Further, the number of lenses in the first lens group is 6, and high specifications and high performance are achieved with a small number of lenses.
(実施例3)
図7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、変倍用の負の屈折力の第2レンズ群G2、像面補正用の負の屈折力の第3レンズ群G3、変倍中固定で正の屈折力の第4レンズ群G4から構成されている。本実施例では、物体距離無限遠から至近に掛けて第2レンズ群G2を像側に、第3レンズ群G3を物体側に繰り出すことによりフォーカシングを行なっている。SPは絞り、Pは色分解光学系、IMGは結像面である。
(Example 3)
FIG. 7 is a lens cross-sectional view of Embodiment 3 at the wide-angle end and at an object distance of infinity. In order from the object side, a first lens unit having a positive refractive power that is fixed during zooming, a second lens unit G2 having a negative refractive power for zooming, and a third lens unit G3 having a negative refractive power for correcting image plane The fourth lens unit G4 is fixed during zooming and has a positive refractive power. In this embodiment, focusing is performed by extending the second lens group G2 to the image side and the third lens group G3 to the object side from the infinite distance to the object distance. SP is a stop, P is a color separation optical system, and IMG is an image plane.
図8aは実施例3の広角端、物体距離無限遠における縦収差図、図8bは望遠端、物体距離無限遠における縦収差図、図8cは望遠端、至近端0.6mにおける縦収差図である。   8a is a longitudinal aberration diagram at the wide-angle end and at an object distance of infinity in Example 3, FIG. 8b is a longitudinal aberration diagram at the telephoto end and at an object distance of infinity, and FIG. 8c is a longitudinal aberration diagram at the telephoto end and the near end of 0.6m. It is.

(数値実施例3)
単位 mm

面データ
面番号 r d nd vd 有効径
1 260.064 5.10 1.77250 49.6 179.12
2 90.946 76.11 145.32
3 -144.175 4.00 1.49700 81.5 133.39
4 2349.392 0.20 139.78
5 289.127 28.30 1.59240 68.3 143.79
6 -190.861 0.20 144.28
7 380.277 16.18 1.43387 95.1 139.86
8 -523.891 0.20 138.61
9 221.343 4.50 1.80518 25.4 131.81
10 130.194 3.81 126.45
11 160.724 19.13 1.43387 95.1 126.43
12 -731.022 0.20 125.49
13 256.668 16.51 1.43387 95.1 120.90
14 -318.416 0.20 120.15
15 115.015 10.36 1.61800 63.3 110.36
16 229.429 (可変) 108.41
17 115.281 2.00 2.00330 28.3 39.88
18 21.557 11.06 32.02
19 -79.013 4.53 1.92286 18.9 31.62
20 -38.471 0.70 31.92
21 -43.717 1.50 1.88300 40.8 30.94
22 70.775 0.40 31.04
23 42.448 4.94 1.92286 18.9 31.84
24 196.227 (可変) 31.41
25 -48.469 1.60 1.75500 52.3 28.60
26 46.847 5.05 1.80518 25.4 30.91
27 3761.604 (可変) 31.72
28(絞り) ∞ 2.00 40.14
29 1625.521 7.17 1.51633 64.1 41.46
30 -57.614 0.20 42.61
31 1288.307 5.21 1.51633 64.1 43.44
32 -158.016 1.07 43.83
33 176.759 8.92 1.49700 81.5 43.93
34 -50.269 2.00 1.88300 40.8 43.76
35 -123.755 68.42 44.48
36 -83.579 5.70 1.48749 70.2 41.03
37 -51.067 0.53 41.54
38 868.628 2.00 1.83400 37.2 40.27
39 61.738 7.28 1.50127 56.5 39.49
40 -127.974 0.53 39.40
41 70.526 9.78 1.49700 81.5 38.36
42 -42.146 2.00 1.88300 40.8 37.45
43 6271.623 0.86 37.16
44 65.824 8.22 1.51823 58.9 36.89
45 -83.069 14.40 35.98
46 ∞ 33.00 1.60859 46.4 40.00
47 ∞ 13.20 1.51633 64.2 40.00
48 ∞ 40.00
像面 ∞

各種データ
ズーム比 30.00

焦点距離 6.00 19.80 63.60 108.00 180.00
Fナンバー 1.60 1.60 1.60 1.60 2.40
画角 42.51 15.52 4.94 2.92 1.75
像高 5.50 5.50 5.50 5.50 5.50
レンズ全長 555.73 555.73 555.73 555.73 555.73
BF 9.99 9.99 9.99 9.99 9.99

d16 2.90 65.04 94.74 102.00 106.32
d24 120.10 51.09 21.62 20.46 26.90
d27 13.50 20.37 20.14 14.04 3.29

入射瞳位置 102.46 202.83 446.16 654.97 929.10
射出瞳位置 136.91 136.91 136.91 136.91 136.91
前側主点位置 108.75 225.72 541.63 854.88 1364.38
後側主点位置 3.99 -9.81 -53.61 -98.01 -170.01

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 93.57 185.00 115.34 40.50
2 17 -24.38 25.12 1.69 -17.02
3 25 -68.02 6.65 -0.02 -3.71
4 28 118.63 192.47 177.19 -222.01

本実施例の各条件式対応値を表1に示す。

(Numerical Example 3)
Unit mm

Surface data surface number rd nd vd Effective diameter
1 260.064 5.10 1.77250 49.6 179.12
2 90.946 76.11 145.32
3 -144.175 4.00 1.49700 81.5 133.39
4 2349.392 0.20 139.78
5 289.127 28.30 1.59240 68.3 143.79
6 -190.861 0.20 144.28
7 380.277 16.18 1.43387 95.1 139.86
8 -523.891 0.20 138.61
9 221.343 4.50 1.80518 25.4 131.81
10 130.194 3.81 126.45
11 160.724 19.13 1.43387 95.1 126.43
12 -731.022 0.20 125.49
13 256.668 16.51 1.43387 95.1 120.90
14 -318.416 0.20 120.15
15 115.015 10.36 1.61800 63.3 110.36
16 229.429 (variable) 108.41
17 115.281 2.00 2.00330 28.3 39.88
18 21.557 11.06 32.02
19 -79.013 4.53 1.92286 18.9 31.62
20 -38.471 0.70 31.92
21 -43.717 1.50 1.88300 40.8 30.94
22 70.775 0.40 31.04
23 42.448 4.94 1.92286 18.9 31.84
24 196.227 (variable) 31.41
25 -48.469 1.60 1.75500 52.3 28.60
26 46.847 5.05 1.80518 25.4 30.91
27 3761.604 (variable) 31.72
28 (Aperture) ∞ 2.00 40.14
29 1625.521 7.17 1.51633 64.1 41.46
30 -57.614 0.20 42.61
31 1288.307 5.21 1.51633 64.1 43.44
32 -158.016 1.07 43.83
33 176.759 8.92 1.49700 81.5 43.93
34 -50.269 2.00 1.88300 40.8 43.76
35 -123.755 68.42 44.48
36 -83.579 5.70 1.48749 70.2 41.03
37 -51.067 0.53 41.54
38 868.628 2.00 1.83400 37.2 40.27
39 61.738 7.28 1.50 127 56.5 39.49
40 -127.974 0.53 39.40
41 70.526 9.78 1.49700 81.5 38.36
42 -42.146 2.00 1.88300 40.8 37.45
43 6271.623 0.86 37.16
44 65.824 8.22 1.51823 58.9 36.89
45 -83.069 14.40 35.98
46 ∞ 33.00 1.60859 46.4 40.00
47 ∞ 13.20 1.51633 64.2 40.00
48 ∞ 40.00
Image plane ∞

Various data Zoom ratio 30.00

Focal length 6.00 19.80 63.60 108.00 180.00
F number 1.60 1.60 1.60 1.60 2.40
Angle of View 42.51 15.52 4.94 2.92 1.75
Image height 5.50 5.50 5.50 5.50 5.50
Total lens length 555.73 555.73 555.73 555.73 555.73
BF 9.99 9.99 9.99 9.99 9.99

d16 2.90 65.04 94.74 102.00 106.32
d24 120.10 51.09 21.62 20.46 26.90
d27 13.50 20.37 20.14 14.04 3.29

Entrance pupil position 102.46 202.83 446.16 654.97 929.10
Exit pupil position 136.91 136.91 136.91 136.91 136.91
Front principal point position 108.75 225.72 541.63 854.88 1364.38
Rear principal point position 3.99 -9.81 -53.61 -98.01 -170.01

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 93.57 185.00 115.34 40.50
2 17 -24.38 25.12 1.69 -17.02
3 25 -68.02 6.65 -0.02 -3.71
4 28 118.63 192.47 177.19 -222.01

Table 1 shows values corresponding to the conditional expressions of this example.
数値実施例3において、いずれの条件式も満足しており、広角端半画角42.5度、変倍比30倍を達成している。また、望遠端、至近端0.6mにおける変倍比11倍を達成しており、至近距離における変倍の低下を抑制している。また、第1レンズ群のレンズ枚数は8枚であり、少ないレンズ枚数で高仕様、高性能を達成している。   In Numerical Example 3, all the conditional expressions are satisfied, and the wide angle end half angle of view is 42.5 degrees and the zoom ratio is 30 times. In addition, the zoom ratio at the telephoto end and the close end of 0.6 m is 11 times, and the reduction in zooming at the close distance is suppressed. The number of lenses in the first lens group is 8, and high specifications and high performance are achieved with a small number of lenses.
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。   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、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 aperture, P glass block, IMG imaging surface

Claims (5)

  1. 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、変倍に際し可動で負の屈折力の第2レンズ群、変倍に際し可動で負の屈折力の第3レンズ群、変倍中固定で正の屈折力の第4レンズ群から構成されるズームレンズにおいて、
    前記第2レンズ群、前記第3レンズ群が物体距離無限遠から至近端にかけて繰り出すことによりフォーカシングを行い、前記第2レンズ群及び前記第3レンズ群の望遠端、至近端における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、
    0.08<|dx2/f2|<0.70
    −1.50<dx2/dx3<−0.08
    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 having a negative refractive power that is movable during zooming, and a third lens group having a negative refractive power that is movable during zooming, In a zoom lens composed of a fourth lens unit having a positive refractive power that is fixed during zooming,
    The second lens group and the third lens group perform focusing by extending from the infinite object distance to the close end, and the payout amounts at the telephoto end and the close end of the second lens group and the third lens group are respectively set. When dx2 and dx3 and the focal length of the second lens group is f2,
    0.08 <| dx2 / f2 | <0.70
    -1.50 <dx2 / dx3 <-0.08
    The zoom lens characterized by being.
  2. 前記第1レンズ群の焦点距離をf1、前記第2レンズ群の焦点距離をf2、前記第3レンズ群の焦点距離をf3とするとき、
    3.0<|f1/f2|<6.0
    0.5<|f1/f3|<2.8
    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, and the focal length of the third lens group is f3,
    3.0 <| f1 / f2 | <6.0
    0.5 <| f1 / f3 | <2.8
    The zoom lens according to claim 1, wherein:
  3. 前記第1レンズ群の後側主点位置をOk1‘、前記第1レンズ群の全長をD1とするとき、
    0.1<Ok1‘/D1<0.3
    であることを特徴とする請求項1又は請求項2に記載のズームレンズ。
    When the rear principal point position of the first lens group is Ok1 ′ and the total length of the first lens group is D1,
    0.1 <Ok1 ′ / D1 <0.3
    The zoom lens according to claim 1, wherein the zoom lens is a zoom lens.
  4. 請求項1乃至請求項3の何れか一項に記載のズームレンズと、該ズームレンズによって形成した像を受光する固体撮像素子とを有していることを特徴とする撮像装置。   An imaging apparatus comprising: the zoom lens according to any one of claims 1 to 3; and a solid-state imaging device that receives an image formed by the zoom lens.
  5. 広角端焦点距離をfw、撮像素子の有効径をISとするとき、
    0.7<D1×fw/(f1×IS)<1.4
    であることを特徴とする請求項4に記載の撮像装置。
    When the wide-angle end focal length is fw and the effective diameter of the image sensor is IS,
    0.7 <D1 × fw / (f1 × IS) <1.4
    The imaging apparatus according to claim 4, wherein:
JP2014148420A 2014-07-22 2014-07-22 Zoom lens and image capturing device having the same Pending JP2016024340A (en)

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