JP4669294B2 - A zoom lens and an image pickup apparatus having the same - Google Patents

A zoom lens and an image pickup apparatus having the same Download PDF

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JP4669294B2
JP4669294B2 JP2005022561A JP2005022561A JP4669294B2 JP 4669294 B2 JP4669294 B2 JP 4669294B2 JP 2005022561 A JP2005022561 A JP 2005022561A JP 2005022561 A JP2005022561 A JP 2005022561A JP 4669294 B2 JP4669294 B2 JP 4669294B2
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大介 伊藤
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キヤノン株式会社
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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B15/00Optical objectives with means for varying the magnification
    • G02B15/14Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/16Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • G02B15/177Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses

Description

本発明はズームレンズに関し、例えば、デジタルスチルカメラ等の撮影光学系に好適なズームレンズに関するものである。 The present invention relates to a zoom lens, for example, to a zoom lens suitable imaging optical system such as a digital still camera.

最近、固体撮像素子を用いたビデオカメラ、デジタルスチルカメラ等、撮像装置(カメラ)の高機能化にともない、それに用いる光学系には広い撮影画角を包含した大口径比のズームレンズが求められている。 Recently, a video camera using a solid-state imaging device, a digital still camera or the like, with the sophistication of the imaging apparatus (camera), the zoom lens of a large aperture ratio is obtained which encompasses a wide photographic angle in the optical system used therefor ing.

更にこの種のカメラには、レンズ最後部と撮像素子との間に、ローパスフィルターや色補正フィルターなどの各種光学部材を配置するため、それに用いる光学系には、比較的バックフォーカスの長いレンズ系が要求される。 More of this type of camera, between the lens rearmost portion and an image pickup element, for positioning the various optical members such as a low-pass filter and a color correction filter, the optical system used therein, a relatively back focus long lens system There is required. この他、カラー画像用の撮像素子を用いたカメラの場合、色シェーディングを避けるため、それに用いる光学系には像側のテレセントリック特性の良いものが望まれている。 In addition, if a camera using an image sensor for color images, in order to avoid color shading, is desired good telecentricity on the image side in the optical system used therein.

従来、負の屈折力の第1レンズ群と正の屈折力の第2レンズ群の2つのレンズ群より成り、双方のレンズ間隔を変えてズーミングを行う、所謂ショートズームタイプの2群ズームレンズが種々提案されている。 Conventionally, it consists of two lens groups of negative refractive power first lens group and positive refractive power second lens group, and performs zooming by changing both the lens interval, the 2-group zoom lens of a so-called short zoom type various proposals have been made. これらのショートズームタイプの光学系では、正の屈折力の第2レンズ群を移動することで変倍を行い、負の屈折力の第1レンズ群を移動することで変倍に伴って変動する像位置の補償を行っている。 These short zoom type of optical system performs zooming by moving the second lens unit having a positive refractive power, varies with zooming by moving the first lens unit having a negative refractive power It is performed to compensate for image position. これらの2つのレンズ群よりなるレンズ構成においては、ズーム比は2倍程度である。 In the lens arrangement consisting of the two lens groups, the zoom ratio is about 2 times.

2倍以上のズーム比を有しつつ、レンズ全体をコンパクトな形状にまとめるため、2群ズームレンズの像側に負または正の屈折力の第3レンズ群を配置し、高ズーム比化を図った、所謂3群ズームレンズも提案されている(例えば特許文献1、2)。 While having more than twice the zoom ratio, to put together the entire lens into a compact shape, arranged third lens unit having a negative or positive refractive power on the image side of the two-unit zoom lens, aiming a high zoom ratio and a so-called three-unit zoom lens has also been proposed (e.g. Patent documents 1 and 2).

また、3群ズームレンズとして長いバックフォーカスを有し、かつテレセントリック特性を満足する3群ズームレンズ系も知られている(例えば特許文献3、4)。 Also has a long back focus as three-group zoom lens, and is also known zoom lens system satisfying the telecentric characteristic (for example, Patent Documents 3 and 4).

又、負、正、正の屈折力のレンズ群より成る3群ズームレンズにおいて、負の屈折力の第1レンズ群をズーミングに際して、固定とし、正の屈折力の第2レンズ群と正の屈折力の第3レンズ群を移動させてズーミングを行う3群ズームレンズが知られている(例えば特許文献5)。 Further, negative, positive, in the three-unit zoom lens composed of lens unit having positive refractive power, upon zooming the first lens unit having a negative refractive power, and fixed, and the positive refractive second lens unit having a positive refractive power third moving the lens group zoom lens that performs zooming force is known (e.g. Patent Document 5).

又、負、正、正の屈折力のレンズ群より成る3群ズームレンズにおいて、第2レンズ群を正レンズ、正レンズ、負レンズ、正レンズより構成した3群ズームレンズが知られている(例えば特許文献6〜13)。 Further, negative, positive, in the three-unit zoom lens composed of lens unit having positive refractive power, a second lens group positive lens, a positive lens, and a negative lens, zoom lens constituted of a positive lens is known ( Patent Document 6-13).

又、負、正、正の屈折力のレンズ群より成る3群ズームレンズにおいて、ズーム比が3以上の高ズーム比のズームレンズが知られている(例えば特許文献14〜23)。 Further, negative, positive, the positive refractive power of the lens three-unit zoom lens composed of a group, the zoom lens of a zoom ratio of 3 or more high zoom ratio is known (e.g. Patent Document 14-23).
特公平7−3507号公報 Kokoku 7-3507 Patent Publication No. 特公平6−40170号公報 Kokoku 6-40170 Patent Publication No. 特開昭63−135913号公報 JP-A-63-135913 JP 特開平7−261083号公報 JP-7-261083 discloses 特開平3−288113号公報 JP-3-288113 discloses 特開平9−258103号公報 JP-9-258103 discloses 特開平11−52246号公報 JP-11-52246 discloses 特開平11−174322号公報 JP 11-174322 discloses 特開平11−174322号公報 JP 11-174322 discloses 特開平11−194274号公報 JP 11-194274 discloses 特許第3466385号 Patent No. 3466385 特開2002−23053号公報 JP 2002-23053 JP 特開2002−196240号公報 JP 2002-196240 JP 特開平4−217219号公報 JP-4-217219 discloses 特開平10−039214号公報 JP 10-039214 discloses 特許平10−213745号公報 Patent flat 10-213745 JP 特開平11−119101号公報 JP 11-119101 discloses 特開平11−174322号公報 JP 11-174322 discloses 特開2001−42218号公報 JP 2001-42218 JP 特許2002−3655545号公報 Patent 2002-3655545 No. 特開2002−267930号公報 JP 2002-267930 JP 特開2003−156686号公報 JP 2003-156686 JP 特許第2895843号 Patent No. 2895843

35mmフィルム写真用に設計されている3群ズームレンズは、固体撮像素子を用いる撮像装置に使用するには、バックフォーカスが長すぎ、またテレセントリック特性が良くないため、固体撮像素子を用いる撮像装置にそのまま用いることが難しい。 35mm film zoom lens that is designed for photographs, for use in imaging apparatus using a solid-state imaging device, the back focus is too long, and because poor telecentricity, the image pickup apparatus using a solid state imaging device it is difficult to use as it is.

一方、カメラのコンパクト化とズームレンズの高ズーム比化(高倍化)を両立するために、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、カメラ本体からのレンズの突出量を少なくした所謂沈胴式のズームレンズが広く用いられている。 On the other hand, a high zoom ratio of compact zoom lens of the camera in order to achieve both (Kobaika), to reduce the distance between the lens units at the time of non-shooting to different intervals between the photographing state, the projection amount of the lens from the camera body the less the so-called retractable zoom lens is widely used.

一般に、ズームレンズを構成する各レンズ群のレンズ枚数が多いと、各レンズ群の光軸上の長さが長くなり、また各レンズ群のズーミング及びフォーカシングにおける移動量が大きいとレンズ全長が長くなるため、所望の沈胴長が達成できなくなり、沈胴式のズームレンズに用いるのが難しくなる。 In general, the number of lenses in each lens unit constituting the zoom lens is large, it may increase the length on the optical axis of each lens unit, also the total lens length becomes long and the amount of movement is large in the zooming and focusing of the lens units Therefore, the desired collapsed length no longer be achieved, to use the retractable zoom lens becomes difficult.

この傾向は、ズームレンズのズーム比が大きくなるほど顕著になる。 This tendency becomes more remarkable as the zoom ratio of the zoom lens becomes large.

本発明は、構成レンズ枚数が比較的少なく、広角端で所望の画角で且つ、所望のズーム比を実現したズームレンズ及びそれを有する撮像装置の提供を目的とする。 The present invention, number of lens elements is relatively small, and at a desired angle at the wide angle end, and an object thereof is to provide a image pickup apparatus having a zoom lens and it was realized the desired zoom ratio.

本発明のズームレンズは、物体側より像側へ順に、負の屈折力の第1レンズ群、正の屈折力の第2レンズ群、正の屈折力の第3レンズ群からなり、ズーミングに際し各レンズ群の間隔が変化するズームレンズにおいて、広角端から望遠端へのズーミングにおける前記第2レンズ群の移動量をΔ2X、広角端における前記第2レンズ群と前記第3レンズ群との間隔をD23w、 前記第1レンズ群と前記第2レンズ群の焦点距離を各々f1,f2、広角端での全系の焦点距離をfw 、前記第1レンズ群を構成するレンズの材料の屈折率の平均値をn1aとするとき、 The zoom lens of the present invention includes, in order from the object side to the image side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having positive refractive power, hand during zooming in the zoom lens the distance of each lens group is changed, the wide-angle end from Δ2X the amount of movement of the second lens group during zooming to the telephoto end, the distance between the third lens group and the second lens group at the wide-angle end d23w, the first lens group and the focal length of the second lens group respectively f1, f2, the focal length of the entire system at the wide angle end fw, the average of the refractive index of the material of the lenses constituting the first lens group when the value and n1a,
1.7<Δ2X/√|f1・f2|<2.3 1.7 <Δ2X / √ | f1 · f2 | <2.3
0.5<D23w/fw<1.2 0.5 <D23w / fw <1.2
1.88<n1a 1.88 <n1a
なる条件を満足することを特徴としている。 It is characterized by satisfying the following condition.

この他、本発明のズームレンズは、物体側より像側へ順に、負の屈折力の第1レンズ群、正の屈折力の第2レンズ群、正の屈折力の第3レンズ群からなり、ズーミングに際し各レンズ群の間隔が変化するズームレンズにおいて、 前記第1レンズ群は2枚のレンズより成り、広角端から望遠端へのズーミングにおける前記第2レンズ群の移動量をΔ2X、 前記第1レンズ群と前記第2レンズ群の焦点距離を各々f1,f2、 前記第1レンズ群を構成するレンズの材料の屈折率の平均値をn1aとするとき、 In addition, the zoom lens of the present invention includes, in order from the object side to the image side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having positive refractive power, in the zoom lens hand spacing of each lens group is changed upon zooming, the first lens group consists of two lenses, Deruta2X the amount of movement of the second lens group during zooming to the telephoto end from the wide angle end, the first each one lens group is a focal length of the second lens group f1, f2, when the average value of the refractive index of the material of the lenses constituting the first lens group and n1a,
1.7<Δ2X/√|f1・f2|<2.3 1.7 <Δ2X / √ | f1 · f2 | <2.3
1.88<n1a 1.88 <n1a
なる条件を満足することを特徴としている。 It is characterized by satisfying the following condition.

この他、本発明のズームレンズは、物体側より像側へ順に、負の屈折力の第1レンズ群、正の屈折力の第2レンズ群、正の屈折力の第3レンズ群からなり、ズーミングに際し各レンズ群の間隔が変化するズームレンズにおいて、広角端から望遠端へのズーミングにおける前記第2レンズ群の移動量をΔ2X、広角端における前記第2レンズ群と前記第3レンズ群との間隔をD23w、 前記第1レンズ群と前記第2レンズ群の焦点距離を各々f1,f2、広角端での全系の焦点距離をfw、 前記第2レンズ群を構成する負レンズの材料の屈折率をn2bとするとき、 In addition, the zoom lens of the present invention includes, in order from the object side to the image side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having positive refractive power, in the zoom lens hand spacing of each lens group is changed upon zooming, Deruta2X the amount of movement of the second lens group during zooming from the wide-angle end to the telephoto end, and the second lens group at the wide-angle end and the third lens group D23w spacing, the first lens group and the focal length of the second lens group respectively f1, f2, the focal length of the entire system at the wide angle end fw, the material of the negative lens constituting the second lens group when the refractive index and n2b,
1.7<Δ2X/√|f1・f2|<2.3 1.7 <Δ2X / √ | f1 · f2 | <2.3
0.5<D23w/fw<1.2 0.5 <D23w / fw <1.2
1.85<n2b 1.85 <n2b
なる条件を満足することを特徴としている。 It is characterized by satisfying the following condition.

この他、本発明のズームレンズは、物体側より像側へ順に、負の屈折力の第1レンズ群、正の屈折力の第2レンズ群、正の屈折力の第3レンズ群からなり、ズーミングに際し各レンズ群の間隔が変化するズームレンズにおいて、 前記第1レンズ群は2枚のレンズより成り、広角端から望遠端へのズーミングにおける前記第2レンズ群の移動量をΔ2X、 前記第1レンズ群と前記第2レンズ群の焦点距離を各々f1,f2、 前記第2レンズ群を構成する負レンズの材料の屈折率をn2bとするとき、 In addition, the zoom lens of the present invention includes, in order from the object side to the image side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having positive refractive power, in the zoom lens hand spacing of each lens group is changed upon zooming, the first lens group consists of two lenses, Deruta2X the amount of movement of the second lens group during zooming to the telephoto end from the wide angle end, the first each one lens group is a focal length of the second lens group f1, f2, when the refractive index of the material of the negative lens constituting the second lens group and n2b,
1.7<Δ2X/√|f1・f2|<2.3 1.7 <Δ2X / √ | f1 · f2 | <2.3
1.85<n2b 1.85 <n2b
なる条件を満足することを特徴としている。 It is characterized by satisfying the following condition.

本発明によれば、構成レンズ枚数が比較的少なく、広画角でかつ高いズーム比のズームレンズが得られる。 According to the present invention, number of lens elements is relatively small, a wide field angle and a high zoom ratio zoom lens is obtained.

以下、本発明のズームレンズ及びそれを有する撮像装置の実施例について説明する。 Hereinafter, a description will be given of an embodiment of an image pickup apparatus having a zoom lens and its invention.

図1は本発明の実施例1のズームレンズの広角端(短焦点距離端)におけるレンズ断面図、図2,図3,図4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(長焦点距離端)における収差図である。 Figure 1 is a lens cross sectional view at the wide-angle end (short focal length end) of the zoom lens of Embodiment 1 of the present invention, FIGS. 2, 3, 4, respectively, at the wide angle end of the zoom lens according to the first embodiment, an intermediate zoom position , and the telephoto end (long focal length end). 実施例1はズーム比4.6、開口比2.6〜6.0程度のズームレンズである。 Example 1 has a zoom ratio of 4.6, an aperture ratio from 2.6 to 6.0 approximately zoom lens.

図5は本発明の実施例2のズームレンズの広角端におけるレンズ断面図、図6,図7,図8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。 Figure 5 is a lens cross sectional view at the wide-angle end of the zoom lens of Embodiment 2 of the present invention, FIGS. 6, 7, 8, respectively, at the wide angle end of Embodiment 2 zoom lens, an intermediate zoom position, the telephoto end it is. 実施例2はズーム比5.4、開口比2.7〜7.0程度のズームレンズである。 Example 2 has a zoom ratio of 5.4, an aperture ratio from 2.7 to 7.0 approximately zoom lens.

図9は本発明の実施例3のズームレンズの広角端におけるレンズ断面図、図10,図11,図12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。 Figure 9 is a lens cross sectional view at the wide-angle end of the zoom lens of Embodiment 3 of the present invention, FIGS. 10, 11 and 12 respectively, at the wide angle end the zoom lens according to the third embodiment, the intermediate zoom position, the telephoto end it is. 実施例3はズーム比5.9、開口比2.5〜6.9程度のズームレンズである。 Example 3 has a zoom ratio of 5.9 and an aperture ratio of 2.5 to 6.9 about the zoom lens.

図13は本発明の実施例4のズームレンズの広角端におけるレンズ断面図、図14,図15,図16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。 Figure 13 is a lens cross sectional view at the wide-angle end of the zoom lens of Embodiment 4 of the present invention, FIGS. 14, 15 and 16 respectively, at the wide angle end of the zoom lens according to the fourth embodiment, an intermediate zoom position, the telephoto end it is. 実施例4はズーム比4.6、開口比2.5〜6.0程度のズームレンズである。 Example 4 has a zoom ratio of 4.6 and an aperture ratio 2.5 to 6.0 about the zoom lens.

図17は本発明の実施例5のズームレンズの広角端におけるレンズ断面図、図18,図19,図20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。 Figure 17 is a lens cross section at a wide angle end according to Embodiment 5 of the zoom lens of the present invention, FIGS. 18, 19, 20, respectively, at the wide angle end Example 5 of the zoom lens, an intermediate zoom position, the telephoto end it is. 実施例5はズーム比4.6、開口比2.5〜6.0程度のズームレンズである。 Example 5 has a zoom ratio of 4.6 and an aperture ratio 2.5 to 6.0 about the zoom lens.

図21は本発明のズームレンズを備えるデジタルスチルカメラ(撮像装置)要部概略図である。 Figure 21 is a digital still camera (image pickup apparatus) main part schematic diagram including the zoom lens of 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レンズ系であり、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。 The zoom lens of each embodiment is a photographing lens system used in an image pickup apparatus, the lens sectional view, the left side is the object side (front side), the right side is the image side (rear).

図1,図5,図9,図13、図17のレンズ断面図において、L1は負の屈折力(光学的パワー=焦点距離の逆数)の第1レンズ群、L2は正の屈折力の第2レンズ群、L3は正の屈折力の第3レンズ群、SPは開口絞りであり、第2レンズ群L2の物体側に配置している。 1, 5, 9, 13, in the lens sectional view of FIG. 17, L1 denotes a first lens unit having a negative refractive power (optical power = reciprocal of focal length), L2 is a positive refractive power first second lens group, L3 denotes a third lens unit having positive refractive power, SP denotes an aperture stop, which is disposed on the object side of the second lens unit L2.

Gは光学フィルター、フェースプレート、水晶ローパスフィルター、赤外カットフィルター等に相当する光学ブロックである。 G denotes an optical block corresponding to an optical filter, a faceplate, a crystal low-pass filter, an infrared cut filter, or the like. IPは像面であり、ビデオカメラやデジタルスチ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)の撮像面に相当する感光面が置かれる。 IP denotes an image plane, when used as a photographic optical system of a video camera or a digital still camera is sensitive surface corresponding to the imaging surface of the solid-state imaging element such as a CCD sensor or a CMOS sensor (photoelectric conversion element) is placed.

収差図において、d,gは各々d線及びg線、ΔM,ΔSはメリディオナル像面、サジタル像面、倍率色収差はg線によって表している。 In the aberration diagrams, d, g d-line and the g-line, .DELTA.M, [Delta] S denote a meridional image plane and a sagittal image plane, the magnification chromatic aberration is represented by the g-line.

尚、以下の各実施例において広角端と望遠端は変倍用レンズ群(第2レンズ群L2)が機構上、光軸上移動可能な範囲の両端に位置したときのズーム位置をいう。 Incidentally, the wide-angle end and the telephoto end in the following embodiments mean zoom positions when the zoom lens group (second lens unit L2) is located at both ends in the mechanism on the optical axis on the movable range.

各実施例のズームレンズでは、広角端から望遠端へのズーミングに際して、第1レンズ群L1が像側に凸状の軌跡で略往復移動し、第2レンズ群L2が物体側に移動し、第3レンズ群L3は像側に移動している。 In the zoom lens of each embodiment, during zooming from the wide-angle end to the telephoto end, the first lens unit L1 is substantially reciprocally moved with a locus convex toward the image side, the second lens unit L2 is moved toward the object side, and the third lens unit L3 moves to the image side.

各実施例のズームレンズは、第2レンズ群L2の移動により主な変倍を行い、第1レンズ群L1の往復移動及び第3レンズ群L3による像側方向への移動によって変倍に伴う像の移動を補正している。 The zoom lens of each embodiment performs main magnification by the movement of the second lens unit L2, the image associated with zooming by moving toward the image side direction of the reciprocating movement and the third lens unit L3 in the first lens unit L1 movement is corrected for.

次に、レンズ構成の具体的な特徴について説明する。 Next, detailed characteristics of the lens configuration.

第1レンズ群L1は、物体側から像側へ順に、物体側に凸面を向けたメニスカス形状の負レンズG11と、物体側に凸面を向けたメニスカス形状の正レンズG12の2枚のレンズで構成している。 The first lens unit L1 includes, in order from the object side to the image side, composed of two lenses of a negative lens G11 having a meniscus shape with a convex surface facing the object side, a positive meniscus lens having a convex surface directed toward the object side G12 doing.

第1レンズ群L1は、軸外主光線を開口絞りSP中心に瞳結像させる役割を持っており、特に広角側においては軸外主光線の屈折量が大きいために軸外諸収差、特に非点収差と歪曲収差が発生し易い。 The first lens unit L1, has a role of pupil imaging to SP central aperture off-axis principal ray, off-axis aberrations for refraction of the off-axis principal ray is large, particularly in the wide-angle side, particularly non easy astigmatism and distortion aberration occurs.

そこで各実施例では、通常の広角レンズと同様、最も物体側のレンズ径の増大が抑えられる負レンズと正レンズのレンズ構成としている。 Therefore, in each embodiment, as with ordinary wide-angle lens, and the lens configuration of a negative lens and a positive lens that increases the lens diameter on the most object side is suppressed.

そして、負レンズG11の像側のレンズ面をレンズ周辺で負の屈折力が弱くなる非球面形状とすることにより、非点収差と歪曲収差をバランス良く補正すると共に、2枚と言う少ないレンズ枚数で第1レンズ群L1を構成し、レンズ全体のコンパクト化を図っている。 Then, by an aspheric shape which negative refractive power becomes weaker lens surface on the image side of the negative lens G11 at the lens periphery, while correcting astigmatism and distortion aberration in good balance, a small number of lenses to say two in constitute a first lens group L1, thereby achieving a compactness of the entire lens.

また第1レンズ群L1を構成する各レンズは、軸外主光線の屈折によって生じる軸外収差の発生を抑えるために開口絞りSPと光軸が交差する点を中心とする同心球面に近いレンズ形状としている。 The respective lenses constituting the first lens unit L1, a lens shape close to a concentric spherical surface aperture stop SP and the optical axis in order to suppress the occurrence of off-axis aberration caused by refraction of off-axis principal ray is centered point of intersection It is set to.

第2レンズ群L2は、物体側から像側へ順に、物体側の面が凸形状の正レンズG21、両レンズ面が凸形状の正レンズG22と両レンズ面が凹形状の負レンズG23とを接合した接合レンズ、正レンズG24より構成している。 The second lens unit L2 includes, in order from the object side to the image side, a positive lens of plane-convex shape on the object side G21, a positive lens G22 and the both lens surfaces of both lens surfaces is a convex shape and a negative lens G23 concave bonding the cemented lens, and a positive lens G24.

第2レンズ群L2は、物体側に正レンズG21と正レンズG22を配置し、第1レンズ群L1を射出した軸外主光線の屈折角を少なくし、軸外諸収差が発生しない様なレンズ形状としている。 The second lens unit L2, arranged between the positive lens G21 positive lens G22 on the object side, a first lens unit L1 to reduce the angle of refraction of the off-axis principal ray emitted, such as off-axis aberrations are not generated lens It has a shape.

また、正レンズG21は、最も軸上光線の通る高さが高いレンズであり、主に球面収差、コマ収差の補正に関与しているレンズである。 The positive lens G21 is a height higher lens through the most axial ray are mainly spherical aberration, lenses involved in correction of coma. そこで各実施例においては、正レンズG21と正レンズG22を配置して、光束を徐々に屈折させることにより球面収差、コマ収差を良好に補正している。 Therefore, in each example, place the positive lens G21 and the positive lens G22, the spherical aberration by gradually refracting a light beam, it is well correct coma aberration.

そして、正レンズG22と接合した負レンズG23の像側の面を、凹形状とすることで、正レンズG21と正レンズG22で発生した収差をキャンセルさせている。 Then, the surface on the image side of the negative lens G23 constructed by cementing the positive lens G22, by a concave shape, to cancel the aberration generated a positive lens G21 at the positive lens G22.

第3レンズ群L3は、少なくとも1枚の物体側の面が凸形状の正レンズG31より構成している。 The third lens unit L3, the surface of at least one object side and a positive lens G31 having a convex shape. 各実施例では、単一の正レンズより成っている。 In each embodiment, it consists of a single positive lens.

第3レンズ群L3は、撮像素子の小型化に伴う各レンズ群の屈折力の増大を分担し、第1、第2レンズ群L1,L2で構成されるショートズーム系の屈折力を減らすことで、特に第1レンズ群L1を構成する各レンズでの収差の発生を抑え良好な光学性能を達成している。 The third lens unit L3, shares the increase of the refractive power of each lens due to the size of the imaging device, first, by reducing the refractive power of the composed short zoom system in the second lens group L1, L2 We have achieved good optical performance suppressing generation of aberration in each lens constituting especially the first lens unit L1. また、特に固体撮像素子等を用いた撮影装置に必要な像側のテレセントリックな結像を第3レンズ群L3にフィールドレンズの役割を持たせることで達成している。 Also it has been achieved by particularly to have a role of a field lens with telecentric imaging of the imaging apparatus necessary for the image side in the third lens unit L3 which uses a solid-state image pickup element or the like.

ここで、バックフォーカスをsk'、第3レンズ群L3の焦点距離をf3、第3レンズ群L3の結像倍率をβ3とすると、 Here, sk back focus', the focal length of the third lens unit L3 f3, if the imaging magnification of the third lens unit L3 and .beta.3,
sk'=f3(1−β3) sk '= f3 (1-β3)
の関係が成り立っている。 It is made up of the relationship.

但し、 However,
0<β3<1.0 0 <β3 <1.0
である。 It is.

ここで、広角端から望遠端へのズーミングに際して第3レンズ群L3を像側に移動するとバックフォーカスsk'が減少することになり、第3レンズ群L3の結像倍率β3は望遠側のズーム領域で増大する。 Here, will be when moving the third lens unit L3 during zooming to the telephoto end from the wide-angle end to the image side back focus sk 'decreases, the imaging magnification β3 of the third lens unit L3 at the telephoto side zoom region in increases. すると、結果的に第3レンズ群L3で変倍を分担することになり、第2レンズ群L2の移動量が減少し、そのためのスペースが節約できるためにレンズ系の小型化に寄与する。 Then, eventually it will be shared zooming by the third lens unit L3, the moving amount of the second lens unit L2 is reduced, which contributes to the miniaturization of the lens system in order to save space therefor.

各実施例のズームレンズを用いて無限遠物体から近距離物体への撮影をする場合には、第1レンズ群L1を物体側へ移動することで良好な性能を得ることもできるが、さらに望ましくは、第3レンズ群L3を物体側に移動させてフォーカスを行った方が良い。 When the shooting to a close object from infinity using the zoom lens of each embodiment, although the first lens unit L1 can be obtained good performance by moving toward the object side, more preferably It is it is better to perform the third lens unit L3 is moved to the object side focus.

これは、最も物体側に配置した第1レンズ群L1をフォーカシングで移動させた場合に生じる、前玉径の増大や、レンズ重量が最も重い第1レンズ群L1を移動させることによるアクチュエーターの負荷の増大を防ぐことができるからである。 This most first lens unit L1 disposed on the object side occurs when moving in focusing, increase in the front lens diameter, the load of the actuator due to lens weight moves the heaviest first lens unit L1 This is because it is possible to prevent an increase. また、フォーカスのために第1レンズ群L1を移動させないことで、第1レンズ群L1と第2レンズ群L2とをカム等で単純に連携してズーミング時に移動させることが可能となり、メカ構造の簡素化及び精度向上を達成できる。 Also, by not moving the first lens unit L1 for focusing, and simply cooperate it can be moved during zooming from the first lens unit L1 and the second lens group L2 by a cam or the like, the mechanical structure the simplification and accuracy improvement can be achieved.

また、第3レンズ群L3にてフォーカシングを行う場合、広角端から望遠端へのズーミングに際して第3レンズ群L3を像側に移動させることにより、フォーカシング移動量の大きい望遠端での第3レンズ群L3の位置を広角端に比して像側に配置することができるため、ズーミング及びフォーカシングで必要となる第3レンズ群L3の移動量の総和を最小とすることが可能となり、レンズ系のコンパクト化が容易になる。 When performing the focusing by the third lens unit L3, by moving the third lens unit L3 on the image side during zooming from the wide-angle end to the telephoto end, the third lens group with a large telephoto end the focusing movement amount since the position of L3 can be disposed on the image side than the wide angle end, it is possible to minimize the moving amount of the sum of the third lens unit L3 which is required in zooming and focusing, a compact lens system reduction is facilitated.

以上のように、各レンズ群を所望の屈折力配置と収差補正とを両立するレンズ構成とすることにより、良好な光学性能を保ちつつ、レンズ系全体のコンパクト化、高ズーム比化、そして沈胴長の短縮を達成している。 As described above, by the lens configuration of each lens group to achieve both the desired refractive power arrangement and the aberration correction, while maintaining excellent optical performance, compactness of the entire lens system, a high zoom ratio, and collapsed It has achieved a shortening of the length.

尚、各実施例のズームレンズにおいて、良好なる光学性能を得るため、又はレンズ系全体の小型化を図るには、次の諸条件のうちの少なくとも1つ以上を満足させるようにしている。 In the zoom lens of each embodiment, in order to obtain a good optical performance, or to achieve entire lens system compact is so as to satisfy at least one or more of the following conditions. これによって、各条件式に相当する効果を得ている。 Thus, to obtain the effect corresponding to the conditional expressions.

広角端から望遠端へのズーミングにおける第2レンズ群L2の移動量をΔ2X(移動量Δ2Xの符号は、物体側への移動を正、その逆を負としている)、広角端における第2レンズ群L2と第3レンズ群L4との間隔をD23W、第1レンズ群L1、第2レンズ群L2、第3レンズ群L3の焦点距離を順にf1,f2,f3、広角端での全系の焦点距離をfw,第2レンズ群L2の広角端と、望遠端での結像倍率を各々β2w、β2t、第3レンズ群L3の広角端と、望遠端での結像倍率を各々β3w、β3t,第1レンズ群L1を構成するレンズの材料の屈折率の平均値をn1a,第2レンズ群L2は、負レンズを有し、該負レンズの材料屈折率をn2bとするとき、 Movement amount Δ2X of the second lens unit L2 during zooming from the wide-angle end to the telephoto end (the sign of the movement amount Δ2X is in the movement toward the object side positive and negative vice versa), the second lens group at the wide-angle end L2 and D23W the distance between the third lens unit L4, the first lens unit L1, the second lens unit L2, the focal length of the third lens unit L3 sequentially f1, f2, f3, the focal length of the entire system at the wide-angle end the fw, and the wide-angle end of the second lens group L2, .beta.2w each imaging magnification at the telephoto end,? 2t, and the wide-angle end of the third lens unit L3,? 3w each imaging magnification at the telephoto end, [beta] 3t, the n1a an average value of the refractive index of the material of the lenses constituting the first lens unit L1, the second lens unit L2 includes a negative lens, when the n2b a material having a refractive index of the negative lens,

0.5< D23w /fw<1.2・・・・(2) 0.5 <D23w /fw<1.2 ···· (2)
3.8<(β2t・β3 )/(β2 ・β3t)>5.2・・・・(3) 3.8 <(β2t · β3 w) / (β2 w · β3t)> 5.2 ···· (3)
1.88<n1a・・・・(4) 1.88 <n1a ···· (4)
1.85<n2b・・・・(5) 1.85 <n2b ···· (5)
1.9<f3/f2<2.5・・・・(6) 1.9 <f3 / f2 <2.5 ···· (6)
5.2<f3/fw<6.4・・・・(7) 5.2 <f3 / fw <6.4 ···· (7)
なる条件を満足している。 It satisfies the following condition.

条件式(1)の下限を超えてズーミングにおける第2レンズ群L2の移動量Δ2Xが小さくなると、第1レンズ群L1と第2レンズ群L2のパワーが緩くなり、所定のズーム比を確保するために各レンズ群の移動量が増し、全系のコンパクト化が難しくなってくる。 If below the lower limit of condition (1) is moving amount Δ2X of the second lens unit L2 during zooming is reduced, the first lens unit L1 power becomes loose of the second lens group L2, to ensure a predetermined zoom ratio the amount of movement of each lens group is increased, the entire system compact it becomes difficult to.

また、条件式(1)の上限値を超えると、第1レンズ群L1と第2レンズ群L2のパワーが強くなり、所定のズーム比を確保するための各レンズ群の移動量は減少するため全系のコンパクト化には有利ではあるが、第1レンズ群L1と第2レンズ群L2のパワーが強くなることにより非点収差、コマ収差等の諸収差の補正が困難になる。 Further, if the upper limit value of conditional expression (1), since the first lens unit L1 and the second power of the lens unit L2 becomes too strong, the amount of movement of each lens unit for securing a predetermined zoom ratio decreases there is advantageous for downsizing of the entire system, but the astigmatism, the correction of various aberrations such as coma becomes difficult by the first lens unit L1 power of the second lens unit L2 increases.

条件式(2)の上限を越えて間隔D23Wが大きくなると、第3レンズ群L3でフォーカスするときの広角端における至近物体へのフォーカシングは容易となるがレンズ全長が増大するため全系のコンパクト化が難しくなる。 If the interval D23W beyond the upper limit of condition (2) becomes large, compact entire system for While focusing on a close object becomes easy to increase the total lens length at the wide-angle end when focusing by the third lens unit L3 it becomes difficult.

条件式(2)の下限を越えて間隔D23Wが小さくなると、広角端において至近物体へのフォーカシングを第3レンズ群L3のみで行うのが難しくなり、例えば更に第1レンズ群L1をフォーカシングの為に移動させることとなり、メカ構造が複雑化し、又、第1レンズ群L1の移動による第1レンズ群の有効径が増大してくるので良くない。 If the interval D23W beyond the lower limit of condition (2) is reduced, to perform the focusing on the close object only by the third lens unit L3 becomes difficult at the wide-angle end, for example, further to the first lens unit L1 of focusing will be moved, mechanical structure is complicated, also, not good effective diameter of the first lens group by the movement of the first lens unit L1 comes increased.

条件式(3)の下限を超えると、第2レンズ群L2の変倍分担が不十分となり、4を越えるズーム比の実現が難しくなり、又、ズーミングにおける第3レンズ群L3の移動量が大きくなり、全長が拡大してくるので良くない。 If the lower limit of condition (3), zooming share of the second lens unit L2 becomes insufficient, it becomes difficult to realize a zoom ratio greater than 4, and a large amount of movement of the third lens unit L3 during zooming now, it is not good because the entire length come to expand.

また、条件式(3)の上限を超えると第2レンズ群L2の変倍分担が大きくなりすぎるため、第2レンズ群L2を構成するレンズの枚数を増やし、第2レンズ群L2内での収差の負荷を分散させなければならず、第2レンズ群L2の全長が長くなり好ましくない。 Also, since the conditional expression (3) magnification sharing exceeds the upper limit second lens unit L2 is too large, increasing the number of lenses constituting the second lens unit L2, aberrations in the second lens unit L2 must to the load distribution is not preferable total length of the second lens unit L2 is long.

条件式(4)の下限値を超えると、所定のズーム比を得るための第1レンズ群L1を構成する各レンズのパワーを大きくしなければならないためレンズ面の曲率、特に像側のレンズ面の曲率半径が小さくなり、レンズ成形が困難となること、また、曲率を緩くして所定のズーム比を得るためには第1レンズ群L1のレンズ枚数が増大し、全系が大型化してくるため好ましくない。 If the lower limit of Condition (4), the predetermined song lens surface since it is necessary to increase the power of each lens constituting the first lens unit L1 for obtaining a zoom ratios, especially the image-side lens surface the radius of curvature is small, it lens molding becomes difficult, also loosely curvature lenses in the first lens unit L1 is increased in order to obtain the predetermined zoom ratio, the entire system comes in size undesirable since.

また、条件式(5)の下限値を超えると、所定のズーム比を得るために第2レンズ群L2のレンズ構成枚数を増加、あるいは負レンズの肉厚を増大しなければならないため全系のコンパクト化が難しくなる。 Further, if the lower limit value of conditional expression (5), of the entire system because it must increase the number of lenses of the second lens unit L2, or the thickness of the negative lens increases in order to obtain the predetermined zoom ratio compact becomes difficult.

条件式(6)の上限を超えて第2レンズ群L2のパワーが弱くなると、所定のズーム比を確保するために第2レンズ群L2の移動量が増大し、コンパクト化には不利になる。 If the condition second power of the lens group L2 exceeds the upper limit of the condition (6) is weakened, the amount of movement of the second lens unit L2 increases in order to ensure a predetermined zoom ratio, which is disadvantageous for downsizing.

又、上限を超えて第3レンズ群L3のパワーが強くなると非点収差を補正するためにレンズ枚数を増大せねばならず全系のコンパクト化が難しくなる。 Further, the entire system compact without must not increase the number of lenses in order to correct the astigmatism if power increases in the third lens unit L3 exceeds the upper limit becomes difficult.

条件式(6)の下限値を越えて第2レンズ群L2のパワーが強くなると、非点収差、コマ収差を補正するために第2レンズ群L2の枚数を増大せねばならず全系のコンパクト化が難しくなる。 If the condition second lens unit L2 of power beyond the lower limit of the expression (6) becomes strong, astigmatism, compact the whole system must take into increasing the number of the second lens unit L2 to correct coma reduction becomes difficult.

条件式(7)の上限値を超えると、射出瞳距離が像面から近くなり、テレセントリック性が悪くなるため好ましくない。 If the upper limit value of conditional expression (7), the exit pupil distance becomes close from the image plane is not preferable because the telecentricity is poor.

また、条件式(7)の下限を超えて第3レンズ群L3のパワーが強くなると、テレセントリック性は良好になるが非点収差が増大し、これを補正するのが困難となる。 Further, when the third power of the lens unit L3 than the lower limit of the conditional expression (7) becomes strong, but telecentricity becomes better and astigmatism increases, it becomes difficult to correct this.

収差補正上、及びレンズ系全体の小型化の為に更に好ましくは、前述の各条件式の数値範囲を次の如く設定するのが良い。 Aberration correction, and more preferably for miniaturization of the entire lens system, may be set as follows the numerical range of the conditional expressions described above.

0.6<D23 /fw<1.1・・・・(2a) 0.6 <D23 w /fw<1.1 ···· (2a )
3.9<(β2 ・β3 )/(β2 ・β3 )<5.1・・・・(3a) 3.9 <(β2 t · β3 w ) / (β2 w · β3 t) <5.1 ···· (3a)
1.90<n1a・・・・(4a) 1.90 <n1a ···· (4a)
1.90<n2b・・・・(5a) 1.90 <n2b ···· (5a)
2.0<f3/f2<2.4・・・・(6a) 2.0 <f3 / f2 <2.4 ···· (6a)
5.3<f3/f <6.35・・・・(7a) 5.3 <f3 / f w <6.35 ···· (7a)
なる条件を満足することである。 It is to satisfy the following condition.

各実施例は以上の様に各要素を設定する事により、特に、固体撮像素子を用いた撮影系に好適な、構成レンズ枚数が少なくコンパクトで、特に沈胴式に適した、ズーム比が4〜6倍程度の優れた光学性能を有するズームレンズが達成出来る。 Each embodiment by setting each element as described above, in particular, suitable for photographic system using a solid-number of lens elements is at least compact, particularly suitable for collapsible zoom ratio is 4 a zoom lens having excellent optical performance approximately six times can be achieved.

又、各実施例によれば第1レンズ群L1中に効果的に非球面を導入することによって、特に第1レンズ群L1と第2レンズ群L2の屈折力を適切に設定することによって軸外諸収差、特に非点収差・歪曲収差および大口径比化した際の球面収差の補正が効果的に行える。 Further, by introducing effectively non-spherical during the first lens unit L1 according to the embodiments, off-axis by particularly appropriately set the refractive power of the first lens unit L1 and the second lens unit L2 aberrations effectively performed especially correction of spherical aberration when the astigmatism, distortion, and a large aperture ratio.

尚、以上の各実施例においては、ズーミングに際して3つのレンズ群を移動させる代わりに、各レンズ群の間隔が変化するように2つのレンズ群(例えば第1と第2レンズ群、 The above in each embodiment, instead of moving the three lens groups during zooming, two lens groups so that the distance between the lens units are changed (e.g., the first and second lens group,
又は第1と第3レンズ群又は第2と第3レンズ群)を移動させるズームタイプにも適用できる。 Or the first and can be applied to the third lens group or the second zoom type moving the third lens group).

又、第1レンズ群L1の物体側又は/及び第3レンズ群L3の像側に屈折力の小さなレンズ群を付加しても本発明で得られる効果には変わりがない。 Also, there is no change in the effect obtained by also present invention by adding a small lens group refractive power on the image side of the object side or / and the third lens unit L3 in the first lens unit L1.

次に、本発明の数値実施例を示す。 Next, numerical examples of the present invention. 各数値実施例において、iは物体側からの面の順序を示し、Riはレンズ面の曲率半径、Diは第i面と第(i+1)面との間の間隔、Ni In each numerical example, i denotes an order of a surface from the object side, the radius of curvature of Ri lens surface, Di is the distance between the i-th surface and the (i + 1) th surface, Ni
,νiはそれぞれd線を基準とした屈折率、アッベ数を示す。 , .Nu.i the refractive index relative to the d line, respectively, the Abbe number.

また、最も像側の2つの面はフェースプレート等のガラス材である。 The two surfaces nearest to the image side are a glass material such as a face plate.

また、非球面形状は、光の進行方向を正とし、xを光軸方向の面頂点からの変位量、h The non-spherical shape, the amount of displacement of the traveling direction of light is positive, x from the surface vertex in the optical axis direction, h
を光軸と垂直な方向の光軸からの高さ、Rを近軸曲率半径、kを円錐定数、B〜Eを非球面係数とするとき、 The direction perpendicular to the optical axis of the height from the optical axis, R a paraxial curvature radius, k a conic constant, when the aspherical coefficients B to E,
x=(h 2 /R)/[1+{1−(1+k)(h/R) 21/2 x = (h 2 / R) / [1+ {1- (1 + k) (h / R) 2} 1/2]
+Bh 4 +Ch 6 +Dh 8 +Eh 10 + Bh 4 + Ch 6 + Dh 8 + Eh 10
なる式で表している。 Made are represented by formula.

又「e−0X」は「×10 −x 」を意味している。 The "e-0X" means "× 10 -x". fは焦点距離、FnoはFナンバー、ωは半画角を示す。 f represents the focal length, Fno represents the F-number, omega denotes a half angle of view. 又前述の各条件式と各数値実施例との関係を表1に示す。 The Table 1 shows the relationship between the numerical examples and the conditional expressions described above.


数値実施例1 Numerical Example 1

f=4.69〜21.60 Fno=2.56〜5.97 2ω=65.5°〜15.9° f = 4.69~21.60 Fno = 2.56~5.97 2ω = 65.5 ° ~15.9 °

R 1 = 28.278 D 1 = 1.80 N 1 = 1.882997 ν 1 = 40.8 R 1 = 28.278 D 1 = 1.80 N 1 = 1.882997 ν 1 = 40.8
R 2 = 5.123 D 2 = 2.84 R 2 = 5.123 D 2 = 2.84
R 3 = 9.485 D 3 = 1.75 N 2 = 1.922860 ν 2 = 18.9 R 3 = 9.485 D 3 = 1.75 N 2 = 1.922860 ν 2 = 18.9
R 4 = 16.168 D 4 = 可変 R 4 = 16.168 D 4 = variable
R 5 = 絞り D 5 = 0.40 R 5 = aperture D 5 = 0.40
R 6 = 13.007 D 6 = 1.50 N 3 = 1.693501 ν 3 = 53.2 R 6 = 13.007 D 6 = 1.50 N 3 = 1.693501 ν 3 = 53.2
R 7 = 690.521 D 7 = 0.10 R 7 = 690.521 D 7 = 0.10
R 8 = 6.185 D 8 = 2.25 N 4 = 1.696797 ν 4 = 55.5 R 8 = 6.185 D 8 = 2.25 N 4 = 1.696797 ν 4 = 55.5
R 9 = -18.336 D 9 = 1.60 N 5 = 1.901355 ν 5 = 31.6 R 9 = -18.336 D 9 = 1.60 N 5 = 1.901355 ν 5 = 31.6
R10 = 5.092 D10 = 0.81 R10 = 5.092 D10 = 0.81
R11 = 23.853 D11 = 1.30 N 6 = 1.719995 ν 6 = 50.2 R11 = 23.853 D11 = 1.30 N 6 = 1.719995 ν 6 = 50.2
R12 = -17.457 D12 = 可変 R12 = -17.457 D12 = variable
R13 = 18.330 D13 = 1.60 N 7 = 1.487490 ν 7 = 70.2 R13 = 18.330 D13 = 1.60 N 7 = 1.487490 ν 7 = 70.2
R14 = -36.938 D14 = 可変 R14 = -36.938 D14 = variable
R15 = ∞ D15 = 1.00 N 8 = 1.516330 ν 8 = 64.1 R15 = ∞ D15 = 1.00 N 8 = 1.516330 ν 8 = 64.1
R16 = ∞ R16 = ∞



焦点距離 4.69 12.90 21.60 Focal length 4.69 12.90 21.60
可変間隔 Variable interval
D 4 20.33 5.16 1.80 D 4 20.33 5.16 1.80
D12 4.02 15.03 26.52 D12 4.02 15.03 26.52
D14 4.33 4.08 3.36 D14 4.33 4.08 3.36


非球面係数 Aspherical coefficients
R2 k=-1.57269e+00 B=9.31352e-04 C=-9.32116e-07 D=1.10249e-08 R2 k = -1.57269e + 00 B = 9.31352e-04 C = -9.32116e-07 D = 1.10249e-08
E=3.97985e-10 E = 3.97985e-10
R8 k=-1.77870e-01 B=5.38565e-05 C=2.46566e-06 R8 k = -1.77870e-01 B = 5.38565e-05 C = 2.46566e-06







数値実施例2 Numerical Example 2

f=4.50〜24.35 Fno=2.74〜7.00 2ω=67.7°〜14.1° f = 4.50~24.35 Fno = 2.74~7.00 2ω = 67.7 ° ~14.1 °

R 1 = 28.104 D 1 = 1.80 N 1 = 1.882997 ν1 = 40.8 R 1 = 28.104 D 1 = 1.80 N 1 = 1.882997 ν1 = 40.8
R 2 = 5.326 D 2 = 2.67 R 2 = 5.326 D 2 = 2.67
R 3 = 9.520 D 3 = 1.75 N 2 = 1.922860 ν 2 = 18.9 R 3 = 9.520 D 3 = 1.75 N 2 = 1.922860 ν 2 = 18.9
R 4 = 16.301 D 4 = 可変 R 4 = 16.301 D 4 = variable
R 5 = 絞り D 5 = 0.20 R 5 = aperture D 5 = 0.20
R 6 = 10.497 D 6 = 1.50 N 3 = 1.620411 ν 3 = 60.3 R 6 = 10.497 D 6 = 1.50 N 3 = 1.620411 ν 3 = 60.3
R 7 = 91.154 D 7 = 0.10 R 7 = 91.154 D 7 = 0.10
R 8 = 6.413 D 8 = 2.05 N 4 = 1.788001 ν 4 = 47.4 R 8 = 6.413 D 8 = 2.05 N 4 = 1.788001 ν 4 = 47.4
R 9 = -27.354 D 9 = 1.50 N 5 = 2.003300 ν 5 = 28.3 R 9 = -27.354 D 9 = 1.50 N 5 = 2.003300 ν 5 = 28.3
R10 = 5.137 D10 = 0.50 R10 = 5.137 D10 = 0.50
R11 = 24.649 D11 = 1.20 N 6 = 1.834000 ν 6 = 37.2 R11 = 24.649 D11 = 1.20 N 6 = 1.834000 ν 6 = 37.2
R12 = -22.165 D12 = 可変 R12 = -22.165 D12 = variable
R13 = 15.118 D13 = 1.60 N 7 = 1.516330 ν 7 = 64.1 R13 = 15.118 D13 = 1.60 N 7 = 1.516330 ν 7 = 64.1
R14 = -112.010 D14 = 可変 R14 = -112.010 D14 = variable
R15 = ∞ D15 = 1.00 N 8 = 1.516330 ν 8 = 64.1 R15 = ∞ D15 = 1.00 N 8 = 1.516330 ν 8 = 64.1
R16 = ∞ R16 = ∞



焦点距離 4.50 14.14 24.35 Focal length 4.50 14.14 24.35
可変間隔 Variable interval
D 4 23.38 5.25 1.80 D 4 23.38 5.25 1.80
D12 3.95 16.12 28.69 D12 3.95 16.12 28.69
D14 4.25 3.96 3.25 D14 4.25 3.96 3.25


非球面係数 Aspherical coefficients
R2 k=-1.31424e+00 B=6.16883e-04 C=3.16840e-06 D=1.01182e-08 R2 k = -1.31424e + 00 B = 6.16883e-04 C = 3.16840e-06 D = 1.01182e-08
E=-3.58477e-10 E = -3.58477e-10
R8 k=-2.76663e+00 B=1.25488e-03 C=-1.10959e-05 D=3.02464e-07 R8 k = -2.76663e + 00 B = 1.25488e-03 C = -1.10959e-05 D = 3.02464e-07







数値実施例3 Numerical Example 3

f=4.29〜25.30 Fno=2.50〜6.90 2ω=70.2°〜13.6° f = 4.29~25.30 Fno = 2.50~6.90 2ω = 70.2 ° ~13.6 °

R 1 = 33.847 D 1 = 1.80 N 1 = 1.882997 ν 1 = 40.8 R 1 = 33.847 D 1 = 1.80 N 1 = 1.882997 ν 1 = 40.8
R 2 = 5.319 D 2 = 2.49 R 2 = 5.319 D 2 = 2.49
R 3 = 9.526 D 3 = 1.75 N 2 = 1.922860 ν 2 = 18.9 R 3 = 9.526 D 3 = 1.75 N 2 = 1.922860 ν 2 = 18.9
R 4 = 16.478 D 4 = 可変 R 4 = 16.478 D 4 = variable
R 5 = 絞り D 5 = 0.20 R 5 = aperture D 5 = 0.20
R 6 = 10.394 D 6 = 1.45 N 3 = 1.639999 ν 3 = 60.1 R 6 = 10.394 D 6 = 1.45 N 3 = 1.639999 ν 3 = 60.1
R 7 = 62.083 D 7 = 0.10 R 7 = 62.083 D 7 = 0.10
R 8 = 6.334 D 8 = 2.10 N 4 = 1.772499 ν 4 = 49.6 R 8 = 6.334 D 8 = 2.10 N 4 = 1.772499 ν 4 = 49.6
R 9 = -51.827 D 9 = 1.55 N 5 = 2.003300 ν 5 = 28.3 R 9 = -51.827 D 9 = 1.55 N 5 = 2.003300 ν 5 = 28.3
R10 = 5.096 D10 = 0.55 R10 = 5.096 D10 = 0.55
R11 = 22.577 D11 = 1.20 N 6 = 1.834000 ν 6 = 37.2 R11 = 22.577 D11 = 1.20 N 6 = 1.834000 ν 6 = 37.2
R12 = -21.511 D12 = 可変 R12 = -21.511 D12 = variable
R13 = 12.440 D13 = 1.60 N 7 = 1.516330 ν 7 = 64.1 R13 = 12.440 D13 = 1.60 N 7 = 1.516330 ν 7 = 64.1
R14 = 110.419 D14 = 可変 R14 = 110.419 D14 = variable
R15 = ∞ D15 = 1.00 N 8 = 1.516330 ν 8 = 64.1 R15 = ∞ D15 = 1.00 N 8 = 1.516330 ν 8 = 64.1
R16 = ∞ R16 = ∞



焦点距離 4.29 14.31 25.30 Focal length 4.29 14.31 25.30
可変間隔 Variable interval
D 4 22.31 4.94 1.78 D 4 22.31 4.94 1.78
D12 3.54 16.87 30.62 D12 3.54 16.87 30.62
D14 4.16 3.50 2.42 D14 4.16 3.50 2.42


非球面係数 Aspherical coefficients
R1 k=1.66792e+01 B=3.29890e-05 C=-3.75031e-06 D=7.54949e-08 R1 k = 1.66792e + 01 B = 3.29890e-05 C = -3.75031e-06 D = 7.54949e-08
E=-8.64945e-10 E = -8.64945e-10
R2 k=-1.28756e+00 B=6.38450e-04 C=5.28748e-06 D=-1.07260e-07 R2 k = -1.28756e + 00 B = 6.38450e-04 C = 5.28748e-06 D = -1.07260e-07
E=7.71211e-10 E = 7.71211e-10
R8 k=-3.00310e+00 B=1.38557e-03 C=-1.77869e-05 D=5.11304e-07 R8 k = -3.00310e + 00 B = 1.38557e-03 C = -1.77869e-05 D = 5.11304e-07






数値実施例4 Numerical Example 4

f=4.69〜21.60 Fno=2.52〜5.97 2ω=65.5°〜15.9° f = 4.69~21.60 Fno = 2.52~5.97 2ω = 65.5 ° ~15.9 °

R 1 = 27.781 D 1 = 1.80 N 1 = 1.882997 ν 1 = 40.8 R 1 = 27.781 D 1 = 1.80 N 1 = 1.882997 ν 1 = 40.8
R 2 = 5.112 D 2 = 2.87 R 2 = 5.112 D 2 = 2.87
R 3 = 9.459 D 3 = 1.75 N 2 = 1.922860 ν 2 = 18.9 R 3 = 9.459 D 3 = 1.75 N 2 = 1.922860 ν 2 = 18.9
R 4 = 16.081 D 4 = 可変 R 4 = 16.081 D 4 = variable
R 5 = 絞り D 5 = 0.40 R 5 = aperture D 5 = 0.40
R 6 = 12.693 D 6 = 1.50 N 3 = 1.693501 ν 3 = 53.2 R 6 = 12.693 D 6 = 1.50 N 3 = 1.693501 ν 3 = 53.2
R 7 = 748.560 D 7 = 0.10 R 7 = 748.560 D 7 = 0.10
R 8 = 6.188 D 8 = 2.25 N 4 = 1.696797 ν 4 = 55.5 R 8 = 6.188 D 8 = 2.25 N 4 = 1.696797 ν 4 = 55.5
R 9 = -17.856 D 9 = 1.60 N 5 = 1.901355 ν 5 = 31.6 R 9 = -17.856 D 9 = 1.60 N 5 = 1.901355 ν 5 = 31.6
R10 = 5.062 D10 = 0.90 R10 = 5.062 D10 = 0.90
R11 = 24.749 D11 = 1.30 N 6 = 1.719995 ν 6 = 50.2 R11 = 24.749 D11 = 1.30 N 6 = 1.719995 ν 6 = 50.2
R12 = -17.554 D12 = 可変 R12 = -17.554 D12 = variable
R13 = 20.052 D13 = 1.60 N 7 = 1.487490 ν 7 = 70.2 R13 = 20.052 D13 = 1.60 N 7 = 1.487490 ν 7 = 70.2
R14 = -32.668 D14 = 可変 R14 = -32.668 D14 = variable
R15 = ∞ D15 = 1.00 N 8 = 1.516330 ν 8 = 64.1 R15 = ∞ D15 = 1.00 N 8 = 1.516330 ν 8 = 64.1
R16 = ∞ R16 = ∞



焦点距離 4.69 17.55 21.60 Focal length 4.69 17.55 21.60
可変間隔 Variable interval
D 4 19.84 5.11 1.80 D 4 19.84 5.11 1.80
D12 3.00 14.28 26.27 D12 3.00 14.28 26.27
D14 4.99 4.58 3.48 D14 4.99 4.58 3.48


非球面係数 Aspherical coefficients
R2 k=-1.55604e+00 B=9.15097e-04 C=-5.65375e-08 D=7.02344e-09 R2 k = -1.55604e + 00 B = 9.15097e-04 C = -5.65375e-08 D = 7.02344e-09
E=2.63734e-10 E = 2.63734e-10
R8 k=-2.86351e-01 B=1.03856e-04 C=4.26746e-06 R8 k = -2.86351e-01 B = 1.03856e-04 C = 4.26746e-06

数値実施例5 Numerical Example 5

f=4.69〜21.60 Fno=2.58〜5.97 2ω=65.5°〜15.9° f = 4.69~21.60 Fno = 2.58~5.97 2ω = 65.5 ° ~15.9 °

R 1 = 28.388 D 1 = 1.80 N 1 = 1.882997 ν 1 = 40.8 R 1 = 28.388 D 1 = 1.80 N 1 = 1.882997 ν 1 = 40.8
R 2 = 5.087 D 2 = 2.90 R 2 = 5.087 D 2 = 2.90
R 3 = 9.529 D 3 = 1.75 N 2 = 1.922860 ν 2 = 18.9 R 3 = 9.529 D 3 = 1.75 N 2 = 1.922860 ν 2 = 18.9
R 4 = 16.168 D 4 = 可変 R 4 = 16.168 D 4 = variable
R 5 = 絞り D 5 = 0.10 R 5 = diaphragm D 5 = 0.10
R 6 = 13.199 D 6 = 1.50 N 3 = 1.693501 ν 3 = 53.2 R 6 = 13.199 D 6 = 1.50 N 3 = 1.693501 ν 3 = 53.2
R 7 = 554.461 D 7 = 0.10 R 7 = 554.461 D 7 = 0.10
R 8 = 6.184 D 8 = 2.25 N 4 = 1.696797 ν 4 = 55.5 R 8 = 6.184 D 8 = 2.25 N 4 = 1.696797 ν 4 = 55.5
R 9 = -18.358 D 9 = 1.60 N 5 = 1.901355 ν 5 = 31.6 R 9 = -18.358 D 9 = 1.60 N 5 = 1.901355 ν 5 = 31.6
R10 = 5.115 D10 = 0.81 R10 = 5.115 D10 = 0.81
R11 = 22.733 D11 = 1.30 N 6 = 1.719995 ν 6 = 50.2 R11 = 22.733 D11 = 1.30 N 6 = 1.719995 ν 6 = 50.2
R12 = -16.955 D12 = 可変 R12 = -16.955 D12 = variable
R13 = 16.884 D13 = 1.60 N 7 = 1.487490 ν 7 = 70.2 R13 = 16.884 D13 = 1.60 N 7 = 1.487490 ν 7 = 70.2
R14 = -49.680 D14 = 可変 R14 = -49.680 D14 = variable
R15 = ∞ D15 = 1.00 N 8 = 1.516330 ν 8 = 64.1 R15 = ∞ D15 = 1.00 N 8 = 1.516330 ν 8 = 64.1
R16 = ∞ R16 = ∞



焦点距離 4.69 12.98 21.60 Focal length 4.69 12.98 21.60
可変間隔 Variable interval
D 4 20.79 5.40 1.96 D 4 20.79 5.40 1.96
D12 5.06 15.84 26.79 D12 5.06 15.84 26.79
D14 3.58 3.27 2.80 D14 3.58 3.27 2.80

非球面係数 Aspherical coefficients
R2 k=-1.49618e+00 B=8.75196e-04 C=-3.59972e-07 D=1.41022e-08 R2 k = -1.49618e + 00 B = 8.75196e-04 C = -3.59972e-07 D = 1.41022e-08
E=3.46972e-10 E = 3.46972e-10
R8 k=-4.33552e-01 B=1.86343e-04 C=5.39556e-06 R8 k = -4.33552e-01 B = 1.86343e-04 C = 5.39556e-06

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スチルカメラ(撮像装置)の実施例を図21を用いて説明する。 The embodiment of a digital still camera (image pickup apparatus) using the zoom lens of the present invention as a photographic optical system will be described with reference to FIG. 21.

図21において、20はカメラ本体、21は本発明のズームレンズによって構成された撮影光学系、22はカメラ本体に内蔵され、撮影光学系21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)、23は撮像素子22によって光電変換された被写体像に対応する情報を記録するメモリ、24は液晶ディスプレイパネル等によって構成され、固体撮像素子22上に形成された被写体像を観察するためのファインダーである。 In Figure 21, 20 denotes a camera body, 21 is a photographing optical system constituted by the zoom lens of the present invention, 22 is incorporated in the camera body, CCD sensor or a CMOS sensor for receiving an object image formed by the imaging optical system 21 the solid-state imaging device and the like (photoelectric conversion element), 23 a memory for recording information corresponding to the object image photoelectrically converted by the imaging device 22, 24 includes a liquid crystal display panel or the like, is formed on the solid-state imaging device 22 and a finder for observing the subject image.

このように本発明のズームレンズをデジタルスチルカメラ等の撮像装置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。 By applying the zoom lens of the present invention to an image pickup apparatus such as digital still cameras, and realize an imaging apparatus having a small size and high optical performance.

実施例1のズームレンズの光学断面図 Optical sectional view of a zoom lens of Embodiment 1 実施例1のズームレンズの広角端での収差図 Aberration diagram at the wide angle end of the zoom lens of Embodiment 1 実施例1のズームレンズの中間のズーム位置での収差図 Aberration diagrams at the intermediate zoom position of the zoom lens of Example 1 実施例1のズームレンズの望遠端での収差図 Aberration diagram in a telephoto end of the zoom lens of Embodiment 1 実施例2のズームレンズの光学断面図 Optical sectional view of a zoom lens of Embodiment 2 実施例2のズームレンズの広角端での収差図 Aberration diagram at the wide angle end of the zoom lens of Embodiment 2 実施例2のズームレンズの中間のズーム位置での収差図 Aberration diagrams at the intermediate zoom position of the zoom lens of Example 2 実施例2のズームレンズの望遠端での収差図 Aberration diagram in a telephoto end of the zoom lens of Embodiment 2 実施例3のズームレンズの光学断面図 Optical sectional view of a zoom lens of Example 3 実施例3のズームレンズの広角端での収差図 Aberration diagram at the wide angle end of the zoom lens in Example 3 実施例3のズームレンズの中間のズーム位置での収差図 Aberration diagrams at the intermediate zoom position of the zoom lens of Example 3 実施例3のズームレンズの望遠端での収差図 Aberration diagram in a telephoto end of the zoom lens in Example 3 実施例4のズームレンズの光学断面図 Optical sectional view of a zoom lens of Example 4 実施例4のズームレンズの広角端での収差図 Aberration diagram at the wide angle end of the zoom lens in Example 4 実施例4のズームレンズの中間のズーム位置での収差図 Aberration diagrams at the intermediate zoom position of the zoom lens of Example 4 実施例4のズームレンズの望遠端での収差図 Aberration diagram in a telephoto end of the zoom lens in Example 4 実施例5のズームレンズの光学断面図 Optical sectional view of a zoom lens of Example 5 実施例5のズームレンズの広角端での収差図 Aberration diagram at the wide angle end of the zoom lens in Example 5 実施例5のズームレンズの中間のズーム位置での収差図 Aberration diagrams at the intermediate zoom position of the zoom lens of Example 5 実施例5のズームレンズの望遠端での収差図 Aberration diagram in a telephoto end of the zoom lens in Example 5 本発明の撮像装置の要部概略図 Main part schematic diagram of an image pickup apparatus of the present invention

符号の説明 DESCRIPTION OF SYMBOLS

L1 第1レンズ群L2 第2レンズ群L3 第3レンズ群SP 絞りIP 像面G ガラスブロックd d線g g線ΔS サジタル像面ΔM メリディオナル像面 L1 first lens group L2 second lens unit L3 third lens group SP diaphragm IP image plane G glass block d d line g g-ray ΔS sagittal image plane ΔM meridional image plane

Claims (17)

  1. 物体側より像側へ順に、負の屈折力の第1レンズ群、正の屈折力の第2レンズ群、正の屈折力の第3レンズ群からなり、ズーミングに際し各レンズ群の間隔が変化するズームレンズにおいて、広角端から望遠端へのズーミングにおける前記第2レンズ群の移動量をΔ2X、広角端における前記第2レンズ群と前記第3レンズ群との間隔をD23w、 前記第1レンズ群と前記第2レンズ群の焦点距離を各々f1,f2、広角端での全系の焦点距離をfw 、前記第1レンズ群を構成するレンズの材料の屈折率の平均値をn1aとするとき、 In order from the object side to the image side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power and a positive third lens group refractive power, hand spacing of each lens group changes upon zooming in the zoom lens, Deruta2X the movement amount of the second lens group in zooming from the wide-angle end to the telephoto end, d23w the distance between the third lens group and the second lens group at the wide-angle end, the first lens group when the focal length of each of the f1 of the second lens group, f2, the focal length of the entire system at the wide angle end fw, the average value of the refractive index of the material of the lenses constituting the first lens group and n1a and,
    1.7<Δ2X/√|f1・f2|<2.3 1.7 <Δ2X / √ | f1 · f2 | <2.3
    0.5<D23w/fw<1.2 0.5 <D23w / fw <1.2
    1.88<n1a 1.88 <n1a
    なる条件を満足することを特徴とするズームレンズ。 Zoom lens satisfies the following condition.
  2. 物体側より像側へ順に、負の屈折力の第1レンズ群、正の屈折力の第2レンズ群、正の屈折力の第3レンズ群からなり、ズーミングに際し各レンズ群の間隔が変化するズームレンズにおいて、 前記第1レンズ群は2枚のレンズより成り、広角端から望遠端へのズーミングにおける前記第2レンズ群の移動量をΔ2X、 前記第1レンズ群と前記第2レンズ群の焦点距離を各々f1,f2、 前記第1レンズ群を構成するレンズの材料の屈折率の平均値をn1aとするとき、 In order from the object side to the image side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power and a positive third lens group refractive power, hand spacing of each lens group changes upon zooming in the zoom lens, the first lens group consists of two lenses, from the wide-angle end Δ2X the amount of movement of the second lens group during zooming to the telephoto end, the first lens group of the second lens group when the focal length, each f1, f2, the mean value of the refractive index of the material of the lenses constituting the first lens group and n1a,
    1.7<Δ2X/√|f1・f2|<2.3 1.7 <Δ2X / √ | f1 · f2 | <2.3
    1.88<n1a 1.88 <n1a
    なる条件を満足することを特徴とするズームレンズ。 Zoom lens satisfies the following condition.
  3. 物体側より像側へ順に、負の屈折力の第1レンズ群、正の屈折力の第2レンズ群、正の屈折力の第3レンズ群からなり、ズーミングに際し各レンズ群の間隔が変化するズームレンズにおいて、広角端から望遠端へのズーミングにおける前記第2レンズ群の移動量をΔ2X、広角端における前記第2レンズ群と前記第3レンズ群との間隔をD23w、 前記第1レンズ群と前記第2レンズ群の焦点距離を各々f1,f2、広角端での全系の焦点距離をfw、 前記第2レンズ群を構成する負レンズの材料の屈折率をn2bとするとき、 In order from the object side to the image side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power and a positive third lens group refractive power, hand spacing of each lens group changes upon zooming in the zoom lens, Deruta2X the movement amount of the second lens group in zooming from the wide-angle end to the telephoto end, d23w the distance between the third lens group and the second lens group at the wide-angle end, the first lens group when the focal length of each of the f1 of the second lens group, f2, the focal length of the entire system at the wide angle end fw, the refractive index of the material of the negative lens constituting the second lens group and n2b and,
    1.7<Δ2X/√|f1・f2|<2.3 1.7 <Δ2X / √ | f1 · f2 | <2.3
    0.5<D23w/fw<1.2 0.5 <D23w / fw <1.2
    1.85<n2b 1.85 <n2b
    なる条件を満足することを特徴とするズームレンズ。 Zoom lens satisfies the following condition.
  4. 物体側より像側へ順に、負の屈折力の第1レンズ群、正の屈折力の第2レンズ群、正の屈折力の第3レンズ群からなり、ズーミングに際し各レンズ群の間隔が変化するズームレンズにおいて、 前記第1レンズ群は2枚のレンズより成り、広角端から望遠端へのズーミングにおける前記第2レンズ群の移動量をΔ2X、 前記第1レンズ群と前記第2レンズ群の焦点距離を各々f1,f2、 前記第2レンズ群を構成する負レンズの材料の屈折率をn2bとするとき、 In order from the object side to the image side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power and a positive third lens group refractive power, hand spacing of each lens group changes upon zooming in the zoom lens, the first lens group consists of two lenses, from the wide-angle end Δ2X the amount of movement of the second lens group during zooming to the telephoto end, the first lens group of the second lens group the focal length of each f1, f2, when the refractive index of the material of the negative lens constituting the second lens group and n2b,
    1.7<Δ2X/√|f1・f2|<2.3 1.7 <Δ2X / √ | f1 · f2 | <2.3
    1.85<n2b 1.85 <n2b
    なる条件を満足することを特徴とするズームレンズ。 Zoom lens satisfies the following condition.
  5. 前記第1レンズ群を構成するレンズの材料の屈折率の平均値をn1aとするとき、 When the n1a the average value of the refractive index of the material of the lenses constituting the first lens group,
    1.88<n1a 1.88 <n1a
    なる条件を満足することを特徴とする請求項3または4に記載のズームレンズ。 The zoom lens according to claim 3 or 4, characterized by satisfying the following condition.
  6. 前記第2レンズ群の広角端と望遠端での結像倍率を各々β2w、β2t、前記第3レンズ群の広角端と望遠端での結像倍率を各々β3w、β3tとするとき、 The second lens group of each imaging magnification at the wide angle end and the telephoto end .beta.2w,? 2t, the third lens group each β3w the imaging magnification at the wide angle end and the telephoto end, when the [beta] 3t,
    3.8<(β2t・β3w)/(β2w・β3t)<5.2 3.8 <(β2t · β3w) / (β2w · β3t) <5.2
    なる条件を満足す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 zoom lens according to any one of claims 1 to 5, characterized by satisfying the following condition.
  7. 広角端から望遠端へのズーミングに際して、前記第1レンズ群は像側に凸状の軌跡で移動し、前記第2レンズ群は物体側に移動し、前記第3レンズ群は像側に移動す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。 During zooming from the wide-angle end to the telephoto end, the first lens unit moves with a locus convex toward the image side, the second lens unit moves toward the object side, the third lens unit moves toward the image side the zoom lens according to any one of claims 1 to 6, characterized in that.
  8. 前記第1レンズ群は負レンズと正レンズから成り、該負レンズの少なくとも1つの面は非球面形状であることを特徴とする請求項1乃至7のいずれか1項に記載のズームレンズ。 Wherein the first lens group and a negative lens and a positive lens, at least one surface the zoom lens according to any one of claims 1 to 7, characterized in that an aspheric shape of the negative lens.
  9. 前記第1レンズ群は、像側の面が凹形状でメニスカス形状負レンズ、物体側の面が凸形状でメニスカス形状正レンズより成り、 前記負レンズの像側の面は非球面形状であることを特徴とする請求項1乃至8のいずれか1項に記載のズームレンズ。 Wherein the first lens group, a negative lens on the image side surface is concave outcomes Nisukasu shape comprises a positive lens on the object side surface is convex outcomes Nisukasu shape, the image side surface of the negative lens is aspherical the zoom lens according to any one of claims 1 to 8, characterized in that a shape.
  10. 前記第2レンズ群は、物体側より像側へ順に、正レンズ、正レンズ、負レンズ、正レンズから成ることを特徴とする請求項1乃至9のいずれか1項に記載のズームレンズ。 The second lens group includes, in order from the object side to the image side, a positive lens, a positive lens, a negative lens, a zoom lens according to any one of claims 1 to 9, characterized in that a positive lens.
  11. 前記第2レンズ群は、物体側より像側へ順に、物体側の面が凸形状の正レンズ、両レンズ面が凸形状の正レンズ、両レンズ面が凹形状の負レンズ、正レンズから成ることを特徴とする請求項1乃至10のいずれか1項に記載のズームレンズ。 The second lens group includes, in order from the object side to the image side, a positive lens surface on the object side convex positive lens, both lens surfaces concave negative lens of both lens surfaces is convex, and a positive lens the zoom lens according to any one of claims 1 to 10, characterized in that.
  12. 前記第3レンズ群の焦点距離をf3とするとき、 When the focal length of the third lens group and f3,
    1.9<f3/f2<2.5 1.9 <f3 / f2 <2.5
    なる条件を満足することを特徴とする請求項1乃至11のいずれか1項に記載のズームレンズ。 The zoom lens according to any one of claims 1 to 11, characterized by satisfying the following condition.
  13. 前記第3レンズ群の焦点距離をf3 、広角端での全系の焦点距離をfwとするとき、 When the focal length of the third lens group f3, the focal length of the entire system at the wide angle end and fw,
    5.2<f3/fw<6.4 5.2 <f3 / fw <6.4
    なる条件を満足することを特徴とする請求項1乃至12のいずれか1項に記載のズームレンズ。 The zoom lens according to any one of claims 1 to 12, characterized by satisfying the following condition.
  14. 前記第3レンズ群は単一の正レンズより成ることを特徴とする請求項1乃至13のいずれか1項に記載のズームレンズ。 The third lens group zoom lens according to any one of claims 1 to 13, characterized in that consists of a single positive lens.
  15. 前記第3レンズ群を物体側に移動させて無限遠物体から近距離物体へのフォーカシングを行うことを特徴とする請求項1乃至14のいずれか1項に記載のズームレンズ。 The zoom lens according to any one of claims 1 to 14, wherein the performing the focusing on the close range object the third lens group is moved toward the object side from infinity.
  16. 固体撮像素子に像を形成することを特徴とする請求項1乃至15のいずれか1項に記載のズームレンズ。 The zoom lens according to any one of claims 1 to 15 and forming an image on a solid-state image device.
  17. 請求項1乃至16のいずれか1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された像を受光する固体撮像素子とを有することを特徴とする撮像装置。 A zoom lens according to any one of claims 1 to 16, an imaging apparatus characterized by having a solid-state imaging device for receiving an image formed by the zoom lens.
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