JP2010014866A - Zoom lens and imaging apparatus having the same - Google Patents
Zoom lens and imaging apparatus having the same Download PDFInfo
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本発明はズームレンズおよびそれを有する撮像装置に関し、特にスチルカメラ、ビデオカメラ、デジタルスチルカメラ、ＴＶカメラ、銀塩カメラ、そして監視用カメラ等に好適なものである。 The present invention relates to a zoom lens and an image pickup apparatus having the same, and is particularly suitable for a still camera, a video camera, a digital still camera, a TV camera, a silver salt camera, a surveillance camera, and the like.
近年、固体撮像素子（ＣＣＤ、ＣＭＯＳ）を用いたビデオカメラ、デジタルスチルカメラ、放送用カメラ、監視カメラ、そして銀塩フィルムを用いたカメラ等の撮像装置は高機能化されている。 In recent years, imaging devices such as a video camera using a solid-state imaging device (CCD, CMOS), a digital still camera, a broadcasting camera, a surveillance camera, and a camera using a silver salt film have become highly functional.
撮像装置として例えば、一眼レフカメラに用いる撮影光学系としては、高ズーム比（高変倍比）、大口径比でバックフォーカスが長く、しかも全ズーム範囲で高い光学性能を有するズームレンズであることが要求されている。 As an imaging device, for example, a photographic optical system used for a single-lens reflex camera is a zoom lens having a high zoom ratio (high zoom ratio), a large aperture ratio, a long back focus, and high optical performance over the entire zoom range. Is required.
これらの要求に応えるズームレンズの１つとして、物体側に正の屈折力のレンズ群を配置したポジティブリード型のズームレンズが知られている。 As one of zoom lenses that meet these requirements, a positive lead type zoom lens in which a lens group having a positive refractive power is disposed on the object side is known.
ポジティブリード型のズームレンズとして、物体側より順に、正、負、正、負、正の屈折力の５つのレンズ群で構成され、比較的大口径比の５群ズームレンズが知られている（特許文献１〜５）。 As a positive lead type zoom lens, a five-group zoom lens having a relatively large aperture ratio, which is composed of five lens groups of positive, negative, positive, negative, and positive refractive power in order from the object side, is known. Patent Documents 1 to 5).
特許文献１〜５のうち、例えば特許文献１では、Ｆナンバー２．８の大口径比の５群ズームレンズを開示している。又特許文献２ではＦナンバー４の５群ズームレンズを開示している。
近年、デジタル一眼レフカメラ用のズームレンズには高ズーム比化と大口径比化、そして撮影される像が高画質であることが強く求められている。 In recent years, zoom lenses for digital single-lens reflex cameras are strongly required to have a high zoom ratio, a large aperture ratio, and a high quality image to be taken.
一般にズームレンズにおいて、高ズーム比化を図るには、変倍レンズ群の屈折力を強める、または、ズーミングの際に変倍レンズ群の移動量を増大すれば良い。 In general, in order to achieve a high zoom ratio in a zoom lens, it is sufficient to increase the refractive power of the variable power lens unit or to increase the amount of movement of the variable power lens unit during zooming.
又、大口径比化を図るには、各レンズ群のレンズ枚数を増加させて諸収差の補正を行えば良い。 In order to achieve a large aperture ratio, various aberrations may be corrected by increasing the number of lenses in each lens group.
しかしながら、変倍レンズ群の屈折力を強めて、移動量を増加させると高ズーム比化は容易になるが、ズーミングの際の収差変動が増大し、全ズーム範囲にわたり高い光学性能を得るのが困難になる。 However, by increasing the refractive power of the variable power lens group and increasing the amount of movement, it is easy to increase the zoom ratio, but aberration fluctuation during zooming increases, and high optical performance is obtained over the entire zoom range. It becomes difficult.
又、大口径比化を図るために各レンズ群のレンズ枚数を増加させるとレンズ系全体が大型化及び高重量化してくるので良くない。 Also, if the number of lenses in each lens group is increased in order to increase the aperture ratio, the entire lens system becomes larger and heavier.
前述した５群ズームレンズにおいて、高ズーム比化及び大口径比化を図りつつ、全ズーム範囲にわたり、高い光学性能を得るには、ズームレンズを構成する各レンズ群の屈折力や各レンズ群のレンズ構成を適切に設定することが重要になってくる。 In the above-mentioned five-group zoom lens, in order to obtain high optical performance over the entire zoom range while achieving a high zoom ratio and a large aperture ratio, the refractive power of each lens group constituting the zoom lens and each lens group It is important to set the lens configuration appropriately.
特に変倍作用の大きな負の屈折力の第２レンズ群、正の屈折力の第３レンズ群の屈折力等を適切に設定するのが重要になってくる。
本発明は、高ズーム比、大口径比で、全ズーム領域にわたり高い光学性能を達成したズームレンズの提供を目的とする。
In particular, it is important to appropriately set the refractive power and the like of the second lens group having a negative refractive power and a third lens group having a positive refractive power, which have a large variable power.
An object of the present invention is to provide a zoom lens that achieves high optical performance over the entire zoom range with a high zoom ratio and a large aperture ratio.
本発明のズームレンズは、物体側より像側へ順に、正の屈折力の第１レンズ群、負の屈折力の第２レンズ群、正の屈折力の第３レンズ群、負の屈折力の第４レンズ群、正の屈折力の第５レンズ群を有し、各レンズ群の間隔を変えて、ズーミングを行うズームレンズにおいて、
広角端と望遠端における全系の焦点距離を各々ｆＷ、ｆＴ、
第２レンズ群と第３レンズ群の焦点距離を各々ｆ２、ｆ３とするとき、
The zoom lens according to the present invention includes, in order from the object side to the image side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a negative lens having a negative refractive power. In a zoom lens having a fourth lens group and a fifth lens group having a positive refractive power, and performing zooming by changing the interval between the lens groups,
The focal lengths of the entire system at the wide-angle end and the telephoto end are fW, fT,
When the focal lengths of the second lens group and the third lens group are f2 and f3, respectively.
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 conditions.
本発明によれば、高ズーム比、大口径比で、全ズーム領域にわたり高い光学性能を達成したズームレンズが得られる。 According to the present invention, it is possible to obtain a zoom lens that achieves high optical performance over the entire zoom range with a high zoom ratio and a large aperture ratio.
以下に、本発明の好ましい実施の形態を、添付の図面に基づいて詳細に説明する。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
本発明のズームレンズは、物体側より像側へ順に、正の屈折力の第１レンズ群、負の屈折力の第２レンズ群、正の屈折力の第３レンズ群、負の屈折力の第４レンズ群、正の屈折力の第５レンズ群を有している。そして各レンズ群の間隔が変化するように各レンズ群を移動させて、ズーミングを行っている。 The zoom lens according to the present invention includes, in order from the object side to the image side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a negative lens having a negative refractive power. It has a fourth lens group and a fifth lens group having a positive refractive power. Then, zooming is performed by moving each lens group so that the interval between the lens groups changes.
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である。図２、図３はそれぞれ実施例１のズームレンズの広角端、望遠端（長焦点距離端）における収差図である。 FIG. 1 is a lens cross-sectional view at the wide-angle end (short focal length end) of the zoom lens according to Embodiment 1 of the present invention. 2 and 3 are aberration diagrams of the zoom lens of Example 1 at the wide-angle end and the telephoto end (long focal length end), respectively.
図４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である。図５、図６はそれぞれ実施例２のズームレンズの広角端、望遠端における収差図である。 FIG. 4 is a lens cross-sectional view at the wide-angle end of the zoom lens according to Embodiment 2 of the present invention. FIGS. 5 and 6 are aberration diagrams of the zoom lens of Example 2 at the wide-angle end and the telephoto end, respectively.
図７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である。図８、図９はそれぞれ実施例３のズームレンズの広角端、望遠端における収差図である。 FIG. 7 is a lens cross-sectional view at the wide-angle end of the zoom lens according to Embodiment 3 of the present invention. 8 and 9 are aberration diagrams of the zoom lens of Example 3 at the wide-angle end and the telephoto end, respectively.
図１０は本発明のズームレンズを備える一眼レフカメラ（撮像装置）の要部概略図である。 FIG. 10 is a schematic diagram of a main part of a single-lens reflex camera (imaging device) including the zoom lens of the present invention.
各実施例のズームレンズは、デジタルカメラ、ビデオカメラ、銀塩フィルム用カメラ等の撮像装置に用いられるものである。 The zoom lens according to each embodiment is used for an imaging apparatus such as a digital camera, a video camera, and a silver salt film camera.
図１、４，７に示したレンズ断面図において、左方が前方（物体側、拡大側）で、右方が後方（像側、縮小側）である。 In the lens cross-sectional views shown in FIGS. 1, 4 and 7, the left side is the front (object side, enlargement side), and the right side is the rear (image side, reduction side).
ｉは物体側から数えたときのレンズ群の順序を示し、Ｌｉは第ｉレンズ群である。 i indicates the order of the lens groups when counted from the object side, and Li is the i-th lens group.
各実施例のズームレンズは、物体側より像側へ順に、正の屈折力の第１レンズ群Ｌ１、負の屈折力の第２レンズ群Ｌ２、正の屈折力の第３レンズ群Ｌ３、負の屈折力の第４レンズ群Ｌ４、正の屈折力の第５レンズ群Ｌ５より成っている。 The zoom lens according to each embodiment includes, in order from the object side to the image side, a first lens unit L1 having a positive refractive power, a second lens unit L2 having a negative refractive power, a third lens unit L3 having a positive refractive power, and a negative lens unit. The fourth lens unit L4 has a refractive power of 5 and the fifth lens unit L5 has a positive refractive power.
ここで屈折力（光学的パワー）とは焦点距離の逆数のことである。 Here, the refractive power (optical power) is the reciprocal of the focal length.
ＳＰは開口絞りであり、各実施例では、第３レンズ群Ｌ３中に配置されている。 Reference numeral SP denotes an aperture stop, which is disposed in the third lens unit L3 in each embodiment.
ＳＳＰはフレアーカット絞りであり、各実施例では第３レンズ群Ｌ３の物体側に配置している。 SSP is a flare-cut stop, which is disposed on the object side of the third lens unit L3 in each embodiment.
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 is an image plane, and when used as a photographing optical system of a video camera or a digital still camera, a photosensitive surface corresponding to an imaging surface of a solid-state imaging device (photoelectric conversion device) such as a CCD sensor or a CMOS sensor is placed.
矢印は広角端から望遠端へのズーミングに際しての各レンズ群の移動軌跡を示している。
収差図において、ｄ、ｇは各々ｄ線、ｇ線である。Ｓ・Ｃは正弦条件である。ΔＭ、ΔＳはｄ線のメリディオナル像面、サジタル像面である。ｆｎｏはＦナンバー、ωは半画角である。
The arrows indicate the movement trajectory of each lens unit during zooming from the wide-angle end to the telephoto end.
In the aberration diagrams, d and g are d-line and g-line, respectively. S · C is a sine condition. ΔM and ΔS are a d-line meridional image surface and a sagittal image surface. fno is an F number, and ω is a half angle of view.
各実施例では、第ｉレンズ群Ｌｉと第ｉ＋１レンズ群Ｌｉ＋１との間隔を変えてズーミングを行っている。 In each embodiment, zooming is performed by changing the interval between the i-th lens unit Li and the i + 1-th lens unit Li + 1.
例えば広角端から望遠端へのズーミングに際して矢印のように、各レンズ群を移動させている。 For example, when zooming from the wide-angle end to the telephoto end, each lens group is moved as indicated by an arrow.
具体的には、広角端から望遠端へのズーミングに際し、第１レンズ群Ｌ１は物体側へ移動している。第２レンズ群Ｌ２は像側へ移動している。第３レンズ群Ｌ３、第４レンズ群Ｌ４、第５レンズ群Ｌ５は各々のレンズ群に挟まれた空気間隔を変化させつつ物体側へ移動している。 Specifically, during zooming from the wide-angle end to the telephoto end, the first lens unit L1 moves to the object side. The second lens unit L2 moves to the image side. The third lens unit L3, the fourth lens unit L4, and the fifth lens unit L5 move to the object side while changing the air gap between the lens units.
各実施例において広角端と望遠端は変倍用レンズ群が機構上、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。 In each embodiment, the wide-angle end and the telephoto end are zoom positions when the zoom lens unit is positioned at both ends of a range in which the zoom lens group can move on the optical axis.
無限遠物体から近距離物体へのフォーカスは第２レンズ群Ｌ２を物体側へ移動させて行っている。 Focusing from an infinitely distant object to a close object is performed by moving the second lens unit L2 toward the object side.
各実施例において、第１レンズ群Ｌ１の物体側又は／及び第５レンズ群Ｌ５の像側にズーミングに際して移動又は不動の屈折力のあるレンズ群を配置しても良い。 In each embodiment, a lens unit having a refractive power that moves or does not move during zooming may be disposed on the object side of the first lens unit L1 and / or on the image side of the fifth lens unit L5.
次に、各実施例の特徴について説明する。 Next, features of each embodiment will be described.
各実施例は、物体側より像側へ順に、正の屈折力の第１レンズ群Ｌ１、負の屈折力の第２レンズ群Ｌ２、正の屈折力の第３レンズ群Ｌ３、負の屈折力の第４レンズ群Ｌ４、正の屈折力の第５レンズ群Ｌ５より成っている。 In each example, in order from the object side to the image side, the first lens unit L1 having a positive refractive power, the second lens unit L2 having a negative refractive power, the third lens unit L3 having a positive refractive power, and a negative refractive power. The fourth lens unit L4 and the fifth lens unit L5 having a positive refractive power.
ｉを物体側から像側へ数えたときのレンズ群の順序とする。広角端と望遠端における第ｉレンズ群と第ｉ＋１レンズ群の空気間隔をＤｉｗ、Ｄｉｔとする。このとき、
Ｄ１ｗ＜Ｄ１ｔ
Ｄ２ｗ＞Ｄ２ｔ
Ｄ３ｗ＜Ｄ３ｔ
Ｄ４ｗ＞Ｄ４ｔ
なる条件を満足するように各レンズ群が移動している。
Let i be the order of the lens groups when counting from the object side to the image side. Diw and Dit are air spaces between the i-th lens group and the i + 1-th lens group at the wide-angle end and the telephoto end. At this time,
D1w <D1t
D2w> D2t
D3w <D3t
D4w> D4t
Each lens group is moved so as to satisfy the following condition.
このように、ズーミングに際して各レンズ群に変倍を分担することで、少ない移動量で所定のズーム比を得ることを容易にしている。そして、Ｆナンバー２程度の大口径でありながらレンズ系全体の小型化を容易にしている。 As described above, when zooming is performed, the zooming is shared by each lens group, thereby making it easy to obtain a predetermined zoom ratio with a small amount of movement. The entire lens system can be easily downsized while having a large aperture of about F number 2.
又、広角端と望遠端における全系の焦点距離を各々ｆＷ、ｆＴとする。 Further, the focal lengths of the entire system at the wide-angle end and the telephoto end are assumed to be fW and fT, respectively.
第２レンズ群と第３レンズ群の焦点距離を各々ｆ２、ｆ３とする。このとき、 The focal lengths of the second lens group and the third lens group are assumed to be f2 and f3, respectively. At this time,
なる条件を満足している。 Is satisfied.
条件式（１）は広角端の焦点距離と望遠端の焦点距離の積の平方根に対する第２レンズ群Ｌ２の焦点距離の絶対値の大きさを規定するものである。条件式（１）の下限値を超えて第２レンズ群Ｌ２の負の屈折力が強くなりすぎると第２レンズ群Ｌ２で発生する諸収差が大きくなりそれを他のレンズ群でバランス良く補正することが困難となる。条件式（１）の上限値を超えて第２レンズ群Ｌ２の負の屈折力が弱くなりすぎると諸収差の補正には有利であるが、レンズ系が大型化してくるので良くない。 Conditional expression (1) defines the absolute value of the focal length of the second lens unit L2 with respect to the square root of the product of the focal length at the wide-angle end and the focal length at the telephoto end. If the negative refracting power of the second lens unit L2 exceeds the lower limit of the conditional expression (1) and becomes too strong, various aberrations generated in the second lens unit L2 become large and are corrected in a balanced manner by other lens units. It becomes difficult. If the upper limit of conditional expression (1) is exceeded and the negative refractive power of the second lens unit L2 becomes too weak, it is advantageous for correcting various aberrations, but this is not good because the lens system becomes large.
条件式（２）は広角端の焦点距離と望遠端の焦点距離の積の平方根に対する第３レンズ群Ｌ３の焦点距離の大きさを規定するものである。条件式（２）の下限値を超えて第３レンズ群Ｌ３の正の屈折力が強くなりすぎると第３レンズ群Ｌ３で発生する諸収差が大きくなりそれを他のレンズ群でバランス良く補正することが困難となる。条件式（２）の上限値を超えて第３レンズ群Ｌ３の正の屈折力が弱くなりすぎると諸収差の補正には有利であるが、レンズ系が大型化してくるので良くない。 Conditional expression (2) defines the size of the focal length of the third lens unit L3 with respect to the square root of the product of the focal length at the wide-angle end and the focal length at the telephoto end. If the lower limit of conditional expression (2) is exceeded and the positive refractive power of the third lens unit L3 becomes too strong, various aberrations that occur in the third lens unit L3 become large and are corrected in a balanced manner by other lens units. It becomes difficult. If the upper limit of conditional expression (2) is exceeded and the positive refractive power of the third lens unit L3 becomes too weak, it is advantageous for correcting various aberrations, but this is not good because the lens system becomes large.
尚、更に好ましくは第２レンズ群Ｌ２と第３レンズ群Ｌ３の焦点距離ｆ２、ｆ３に関する条件式（１）、（２）の数値範囲を次の如く設定するのが良い。 More preferably, the numerical ranges of the conditional expressions (1) and (2) regarding the focal lengths f2 and f3 of the second lens unit L2 and the third lens unit L3 are set as follows.
各実施例によれば以上のように構成することによって、諸収差を全ズーム域にわたって良好に補正した高い光学性能を有するＦナンバー２程度と大口径比で標準域を含んだ高ズーム比のズームレンズを達成している。 According to each embodiment, by configuring as described above, a zoom with a high zoom ratio including a standard range with a large aperture ratio and a large aperture ratio of about F number 2 having high optical performance in which various aberrations are well corrected over the entire zoom range. Has achieved the lens.
各実施例において更に好ましくは次の諸条件のうちの１以上を満足するのが良い。それによれば、各条件式に対応した効果が得られる。 In each embodiment, it is more preferable that one or more of the following conditions be satisfied. According to this, an effect corresponding to each conditional expression can be obtained.
第１、第４、第５レンズ群の焦点距離を順にｆ１、ｆ４、ｆ５とする。 The focal lengths of the first, fourth, and fifth lens groups are sequentially set as f1, f4, and f5.
このとき下記の条件式のうち１以上を満足するのが良い。 At this time, it is preferable to satisfy one or more of the following conditional expressions.
０．８５ ＜ ｜ｆ２｜／ｆＷ ＜ １．２０ ・・・（３）
０．２９ ＜ ｜ｆ２｜／ｆＴ ＜ ０．４０ ・・・（４）
０．４７ ＜ ｆ３ ／ｆＴ ＜ ０．６０ ・・・（５）
１．４ ＜ ｆ３ ／ｆＷ ＜ １．７ ・・・（６）
１．８ ＜ ｜ｆ４｜／ｆＷ ＜ ２．８ ・・・（７）
２．０ ＜ ｆ５ ／ｆＷ ＜ ２．４ ・・・（８）
５．８ ＜ ｆ１ ／ｆＷ ＜ ７．６ ・・・（９）
次に前述の各条件式の技術的な意味を説明する。
0.85 <| f2 | / fW <1.20 (3)
0.29 <| f2 | / fT <0.40 (4)
0.47 <f3 / fT <0.60 (5)
1.4 <f3 / fW <1.7 (6)
1.8 <| f4 | / fW <2.8 (7)
2.0 <f5 / fW <2.4 (8)
5.8 <f1 / fW <7.6 (9)
Next, the technical meaning of each conditional expression described above will be described.
条件式（３）は広角端の焦点距離に対する第２レンズ群Ｌ２の焦点距離の絶対値の大きさを規定するものである。条件式（３）の下限値を超えて第２レンズ群Ｌ２の負の屈折力が強くなりすぎると所定のズーム比（変倍比）を得るための第２レンズ群Ｌ２の移動量が少なくなり小型化に有利となる。 Conditional expression (3) defines the magnitude of the absolute value of the focal length of the second lens unit L2 with respect to the focal length at the wide-angle end. When the negative refractive power of the second lens unit L2 becomes too strong beyond the lower limit of conditional expression (3), the amount of movement of the second lens unit L2 to obtain a predetermined zoom ratio (magnification ratio) decreases. This is advantageous for downsizing.
しかしながら第２レンズ群Ｌ２で発生する諸収差が大きくなりそれを他のレンズ群でバランス良く補正することが困難となる。条件式（３）の上限値を超えて第２レンズ群Ｌ２の負の屈折力が弱くなりすぎると諸収差の補正に有利となる。しかしながら、所定のズーム比を得るための第２レンズ群Ｌ２の移動量が大きくなりレンズ系が大型化してくるので良くない。 However, various aberrations generated in the second lens unit L2 become large, and it is difficult to correct them in a balanced manner with other lens units. If the upper limit of conditional expression (3) is exceeded and the negative refractive power of the second lens unit L2 becomes too weak, it is advantageous for correction of various aberrations. However, this is not good because the amount of movement of the second lens unit L2 for obtaining a predetermined zoom ratio becomes large and the lens system becomes large.
条件式（４）は望遠端の焦点距離に対する第２レンズ群Ｌ２の焦点距離の絶対値の大きさを規定するものである。条件式（４）の下限値を超えて第２レンズ群Ｌ２の負の屈折力が強くなりすぎると第２レンズ群Ｌ２で発生する諸収差が大きくなりそれを他のレンズ群でバランス良く補正することが困難となる。条件式（４）の上限値を超えて第２レンズ群Ｌ２の負の屈折力が弱くなりすぎるとレンズ系が大型化してくるので良くない。 Conditional expression (4) defines the absolute value of the focal length of the second lens unit L2 with respect to the focal length at the telephoto end. If the negative refractive power of the second lens unit L2 becomes too strong beyond the lower limit value of the conditional expression (4), various aberrations generated in the second lens unit L2 become large and are corrected in a balanced manner by other lens units. It becomes difficult. If the upper limit of conditional expression (4) is exceeded and the negative refractive power of the second lens unit L2 becomes too weak, the lens system will be enlarged, which is not good.
条件式（５）は望遠端の焦点距離に対する第３レンズ群Ｌ３の焦点距離の大きさを規定するものである。条件式（６）は広角端の焦点距離に対する第３レンズ群Ｌ３の焦点距離の大きさを規定するものである。条件式（５）、（６）の下限値を超えて第３レンズ群Ｌ３の正の屈折力が強くなりすぎると第３レンズ群Ｌ３で発生する諸収差が大きくなりそれを他のレンズ群でバランス良く補正することが困難となる。条件式（５）、（６）の上限値を超えて第３レンズ群Ｌ３の負の屈折力が弱くなりすぎるとレンズ系が大型化してくるので良くない。 Conditional expression (5) defines the magnitude of the focal length of the third lens unit L3 with respect to the focal length at the telephoto end. Conditional expression (6) defines the magnitude of the focal length of the third lens unit L3 with respect to the focal length at the wide-angle end. If the lower limit of conditional expressions (5) and (6) is exceeded and the positive refracting power of the third lens unit L3 becomes too strong, various aberrations generated in the third lens unit L3 will increase, and this will occur in other lens units. It becomes difficult to correct in a balanced manner. If the upper limit of conditional expressions (5) and (6) is exceeded and the negative refractive power of the third lens unit L3 becomes too weak, the lens system will be enlarged, which is not good.
各実施例のズームレンズは、撮像素子対角長の焦点距離、所謂標準域の焦点距離を含み、ズーム比３倍程度の５群ズームレンズである。条件式（７）、（８）はこのような焦点距離範囲をカバーし、かつＦナンバー２程度の大口径比の５群ズームレンズを達成するために好ましい第４レンズ群Ｌ４と第５レンズ群Ｌ５の焦点距離に関する。 The zoom lens of each embodiment is a five-group zoom lens that includes a focal length of a diagonal length of the image sensor, that is, a so-called standard range focal length, and has a zoom ratio of about 3 times. Conditional expressions (7) and (8) cover such a focal length range, and are preferable for achieving a five-unit zoom lens having a large aperture ratio of about F-number 2 and the fourth lens unit L4 and the fifth lens unit. This relates to the focal length of L5.
条件式（７）は広角端の焦点距離に対する第４レンズ群Ｌ４の焦点距離の絶対値の大きさを規定するものである。条件式（７）の下限値を超えて第４レンズ群Ｌ４の負の屈折力が強くなりすぎると所定のズーム比を得るための第３レンズ群Ｌ３、第５レンズ群Ｌ５の移動量が少なくなりコンパクト化に有利となる。しかしながら第４レンズ群Ｌ４で発生する諸収差が大きくなりそれを他のレンズ群でバランス良く補正することが困難となる。 Conditional expression (7) defines the magnitude of the absolute value of the focal length of the fourth lens unit L4 with respect to the focal length at the wide-angle end. If the lower limit of conditional expression (7) is exceeded and the negative refractive power of the fourth lens unit L4 becomes too strong, the amount of movement of the third lens unit L3 and the fifth lens unit L5 to obtain a predetermined zoom ratio is small. This is advantageous for downsizing. However, various aberrations generated in the fourth lens unit L4 become large, and it is difficult to correct them in a balanced manner with other lens units.
条件式（７）の上限値を超えて第４レンズ群Ｌ４の負の屈折力が弱くなりすぎると諸収差の補正には有利である。しかしながら、所定のズーム比を得るための第３レンズ群Ｌ３、第５レンズ群Ｌ５の移動量が大きくなりレンズ系が大型化してくるので良くない。 If the negative refractive power of the fourth lens unit L4 becomes too weak beyond the upper limit of conditional expression (7), it is advantageous for correcting various aberrations. However, this is not good because the amount of movement of the third lens unit L3 and the fifth lens unit L5 for obtaining a predetermined zoom ratio becomes large and the lens system becomes large.
条件式（８）は広角端の焦点距離に対する第５レンズ群Ｌ５の焦点距離の大きさを規定するものである。条件式（８）の下限値を超えて第５レンズ群Ｌ５の正の屈折力が強くなりすぎると第５レンズ群Ｌ５で発生する諸収差、特に倍率色収差、像面湾曲等が大きくなってくる。条件式（８）の上限値を超えて第５レンズ群Ｌ５の正の屈折力が弱くなりすぎると所定の長さのバックフォーカスを得ることが困難となってくる。 Conditional expression (8) defines the magnitude of the focal length of the fifth lens unit L5 with respect to the focal length at the wide-angle end. When the lower limit of conditional expression (8) is exceeded and the positive refractive power of the fifth lens unit L5 becomes too strong, various aberrations generated in the fifth lens unit L5, particularly lateral chromatic aberration, field curvature, and the like become large. . If the upper limit of conditional expression (8) is exceeded and the positive refractive power of the fifth lens unit L5 becomes too weak, it becomes difficult to obtain a back focus of a predetermined length.
また各実施例において、第１レンズ群Ｌ１を物体側より像側へ順に、メニスカス形状の負レンズ、正レンズ、正レンズで構成している。このとき第１レンズ群Ｌ１の焦点距離がｆ１が条件式（９）を満足するのが良い。 In each embodiment, the first lens unit L1 is composed of a meniscus negative lens, a positive lens, and a positive lens in order from the object side to the image side. At this time, it is preferable that the focal length f1 of the first lens unit L1 satisfies the conditional expression (9).
条件式（９）は広角端での全系の焦点距離に対する第１レンズ群Ｌ１の焦点距離を規定するものである。条件式（９）の下限値を超えて第１レンズ群Ｌ１の正の屈折力が強くなりすぎると所定のズーム比を得るための第１レンズ群Ｌ１の移動量が小さくなり全系の小型化に有利となる。しかしながら、第１レンズ群Ｌ１を前述のレンズ構成で諸収差を小さく抑えることが困難となる。条件式（９）の上限値を超えて第１レンズ群Ｌ１の正の屈折力が弱くなりすぎると所定のズーム比を得るための第１レンズ群Ｌ１の移動量が大きくなりレンズ全長が長くなり、又第１レンズ群Ｌ１のレンズ外径が増大してくる。 Conditional expression (9) defines the focal length of the first lens unit L1 with respect to the focal length of the entire system at the wide-angle end. If the lower limit of conditional expression (9) is exceeded and the positive refractive power of the first lens unit L1 becomes too strong, the amount of movement of the first lens unit L1 to obtain a predetermined zoom ratio becomes small, and the entire system is downsized. Is advantageous. However, it is difficult to suppress various aberrations in the first lens unit L1 with the above-described lens configuration. If the upper limit of conditional expression (9) is exceeded and the positive refractive power of the first lens unit L1 becomes too weak, the amount of movement of the first lens unit L1 to obtain a predetermined zoom ratio increases, and the total lens length increases. Also, the lens outer diameter of the first lens unit L1 increases.
尚、更に好ましくは条件式（３）〜（９）の数値範囲を次の如く設定するのが良い。 More preferably, the numerical ranges of the conditional expressions (3) to (9) are set as follows.
０．８７ ＜ ｜ｆ２｜／ｆＷ ＜ １．１０ ・・・（３ａ）
０．２９ ＜ ｜ｆ２｜／ｆＴ ＜ ０．３６ ・・・（４ａ）
０．４８ ＜ ｆ３ ／ｆＴ ＜ ０．５６ ・・・（５ａ）
１．４５ ＜ ｆ３ ／ｆＷ ＜ １．６５ ・・・（６ａ）
１．９０ ＜ ｜ｆ４｜／ｆＷ ＜ ２．６０ ・・・（７ａ）
２．１０ ＜ ｆ５ ／ｆＷ ＜ ２．３０ ・・・（８ａ）
６．００ ＜ ｆ１ ／ｆＷ ＜ ７．００ ・・・（９ａ）
また、各実施例では、第２レンズ群Ｌ２を物体側より像側へ順にメニスカス形状の負レンズ、両凹形状の負レンズ、正レンズ、全体として負の屈折力のレンズユニット（接合レンズ）で構成している。又、メニスカス形状の負レンズの物体側の面を非球面形状としている。これにより比較的強い負の屈折力を有する第２レンズ群Ｌ２で発生する諸収差を良好に補正している。また、非球面により、主に歪曲収差を良好に補正している。
0.87 <| f2 | / fW <1.10 (3a)
0.29 <| f2 | / fT <0.36 (4a)
0.48 <f3 / fT <0.56 (5a)
1.45 <f3 / fW <1.65 (6a)
1.90 <| f4 | / fW <2.60 (7a)
2.10 <f5 / fW <2.30 (8a)
6.00 <f1 / fW <7.00 (9a)
In each embodiment, the second lens unit L2 is composed of a meniscus negative lens, a biconcave negative lens, a positive lens, and a lens unit (junction lens) having a negative refractive power as a whole in order from the object side to the image side. It is composed. The object side surface of the meniscus negative lens is aspherical. Accordingly, various aberrations generated in the second lens unit L2 having a relatively strong negative refractive power are corrected well. In addition, distortion is mainly corrected favorably by the aspherical surface.
第３レンズ群Ｌ３は少なくとも１つの非球面形状のレンズ面と少なくとも２枚の正レンズと１枚の負レンズを有している。 The third lens unit L3 includes at least one aspherical lens surface, at least two positive lenses, and one negative lens.
具体的には、第３レンズ群Ｌ３を非球面を有する正レンズ、正レンズと負レンズを接合した接合レンズで構成している。第３レンズ群Ｌ３をこのようなレンズ構成とすることで、Ｆナンバー２程度の大口径でありながら球面収差を良好に補正している。 Specifically, the third lens unit L3 includes a positive lens having an aspheric surface and a cemented lens in which a positive lens and a negative lens are cemented. By adopting such a lens configuration for the third lens unit L3, spherical aberration is corrected well while having a large aperture of about F number 2.
第４レンズ群Ｌ４は正レンズと負レンズとを接合した接合レンズを有している。具体的には第４レンズ群Ｌ４を正レンズと負レンズとを接合した接合レンズ及び負レンズまたは負レンズと正レンズとを接合した接合レンズの２群３枚又は２群４枚で構成している。 The fourth lens unit L4 has a cemented lens in which a positive lens and a negative lens are cemented. Specifically, the fourth lens unit L4 is composed of two groups of three lenses or two groups of four lenses: a cemented lens in which a positive lens and a negative lens are cemented and a negative lens or a cemented lens in which a negative lens and a positive lens are cemented. Yes.
第５レンズ群Ｌ５は少なくとも１つの非球面形状のレンズ面と、少なくとも２枚の正レンズと少なくとも１枚の負レンズを有している。 The fifth lens unit L5 has at least one aspherical lens surface, at least two positive lenses, and at least one negative lens.
具体的には、第５レンズ群Ｌ５を非球面を有する負レンズと正レンズとを接合した接合レンズ及び像面側に凸形状の接合面を向けた正レンズと負レンズとを接合した接合レンズで構成している。これにより、特に像面湾曲、倍率色収差を良好に補正している。 Specifically, the fifth lens unit L5 is a cemented lens in which a negative lens having an aspheric surface and a positive lens are cemented, and a cemented lens in which a positive lens having a convex cemented surface facing the image surface side and a negative lens are cemented. It consists of. Thereby, especially curvature of field and lateral chromatic aberration are corrected satisfactorily.
尚、各実施例において、非球面形状はレンズ面上に樹脂等を塗布した複合型非球面を用いているが、レンズ面を研磨して非球面形状としても良い。 In each embodiment, the aspherical shape is a composite aspherical surface in which a resin or the like is applied on the lens surface. However, the aspherical shape may be polished by polishing the lens surface.
以下に本発明の数値実施例１〜３を示す。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は物体側より第ｉ番目の面の曲率半径、ｄｉは物体側より第ｉ番目と第ｉ＋１番目の間隔、ｎｉとνｉは第ｉ番目の光学部材のｄ線に対する屈折率とアッベ数である。ｆ、ｆｎｏ、２ωはそれぞれ無限遠物体に焦点を合わせたときの全系の焦点距離、Ｆナンバー、画角を表している。 Numerical examples 1 to 3 of the present invention are shown below. In each numerical example, i indicates the order of the surfaces from the object side, ri is the radius of curvature of the i-th surface from the object side, di is the i-th and i + 1-th interval from the object side, ni and νi Are the refractive index and Abbe number for the d-line of the i-th optical member. f, fno, and 2ω represent the focal length, F number, and angle of view of the entire system when focusing on an object at infinity, respectively.
非球面形状は光軸方向にＸ軸、光軸と垂直方向にＨ軸、光の進行方向を正、Ｒを近軸曲率半径、ｋを離心率、ｂ、ｃ、ｄ、ｅを各々非球面係数としたとき、
Ｘ＝（１／Ｒ）Ｈ２／（１＋（１−（１＋ｋ）（Ｈ／Ｒ）２）１／２）
＋ｂＨ４＋ｃＨ６＋ｄＨ８＋ｅＨ１０
なる式で表している。
The aspherical shape is the X axis in the optical axis direction, the H axis in the direction perpendicular to the optical axis, the light traveling direction is positive, R is the paraxial radius of curvature, k is the eccentricity, and b, c, d, and e are aspherical surfaces. As a coefficient
X = (1 / R) H 2 / (1+ (1− (1 + k) (H / R) 2 ) 1/2 )
+ BH 4 + cH 6 + dH 8 + eH 10
It is expressed by the following formula.
また、例えば、「Ｅ−Ｚ」の表示は「１０−Ｚ」を意味する。 For example, the display of “E-Z” means “10 −Z ”.
そして、前述の各条件式と数値実施例における諸数値との関係を表１に示す。 Table 1 shows the relationship between the above-described conditional expressions and numerical values in the numerical examples.
数値実施例1
f= 17.5~ 53.1 FNo=1: 2.0 2ω=75.9°~28.9°
r 1= 175.136 d 1= 1.90 n 1=1.84666 ν 1=23.9
r 2= 72.707 d 2= 9.28 n 2=1.60311 ν 2=60.6
r 3= 1659.827 d 3= 0.15
r 4= 62.816 d 4= 7.50 n 3=1.71300 ν 3=53.9
r 5= 224.724 d 5= 可変
r 6= 331.383(非球面)d 6= 0.05 n 4=1.51640 ν 4=52.2
r 7= 97.305 d 7= 1.20 n 5=1.80400 ν 5=46.6
r 8= 16.026 d 8= 7.38
r 9= -44.671 d 9= 1.00 n 6=1.83481 ν 6=42.7
r10= 44.671 d10= 0.15
r11= 37.129 d11= 5.32 n 7=1.83400 ν 7=37.2
r12= -38.449 d12= 1.23
r13= -21.974 d13= 0.90 n 8=1.80400 ν 8=46.6
r14= 51.597 d14= 4.84 n 9=1.80518 ν 9=25.4
r15= -58.592 d15= 可変
r16= 0.000 d16= 0.50
r17= 1326.585 d17= 3.50 n10=1.58913 ν10=61.1
r18= -44.639 d18= 1.00
r19= 0.000(絞り) d19= 1.25
r20= 37.634(非球面)d20= 10.25 n11=1.58313 ν11=59.4
r21= -25.343 d21= 2.50 n12=1.84666 ν12=23.9
r22= -40.897 d22= 可変
r23= -55.729 d23= 3.15 n13=1.84666 ν13=23.9
r24= -25.080 d24= 0.80 n14=1.69680 ν14=55.5
r25= 87.573 d25= 5.64
r26= -35.177 d26= 1.20 n15=1.84666 ν15=23.9
r27= -88.974 d27= 2.26 n16=1.58913 ν16=61.1
r28= -42.776 d28= 可変
r29= 177.210(非球面)d29= 0.08 n17=1.51640 ν17=52.2
r30= 230.563 d30= 1.32 n18=1.83400 ν18=37.2
r31= 52.263 d31= 6.98 n19=1.49700 ν19=81.5
r32= -32.659 d32= 0.15
r33= 53.763 d33= 8.90 n20=1.49700 ν20=81.5
r34= -25.629 d34= 1.70 n21=1.74950 ν21=35.3
r35= -56.583
焦点距離 17.50 32.51 53.05
可変間隔
d 5 3.82 18.81 34.96
d 15 20.08 6.46 0.75
d 22 1.30 7.91 10.99
d 28 10.40 3.79 0.71
ックフォーカス 34.90 42.32 48.26
非球面係数
第 6面 b c d e
2.002883e-05 -4.912051e-08 1.336013e-10 -9.191695e-14
第20面 b c d e
-3.363478e-06 -1.015652e-08 4.412899e-11 -8.120484e-14
第29面 b c d e
-3.976386e-06 1.390626e-08 -5.283650e-11 1.089437e-13
Numerical example 1
f = 17.5 ~ 53.1 FNo = 1: 2.0 2ω = 75.9 ° ~ 28.9 °
r 1 = 175.136 d 1 = 1.90 n 1 = 1.84666 ν 1 = 23.9
r 2 = 72.707 d 2 = 9.28 n 2 = 1.60311 ν 2 = 60.6
r 3 = 1659.827 d 3 = 0.15
r 4 = 62.816 d 4 = 7.50 n 3 = 1.71300 ν 3 = 53.9
r 5 = 224.724 d 5 = variable
r 6 = 331.383 (aspherical surface) d 6 = 0.05 n 4 = 1.51640 ν 4 = 52.2
r 7 = 97.305 d 7 = 1.20 n 5 = 1.80400 ν 5 = 46.6
r 8 = 16.026 d 8 = 7.38
r 9 = -44.671 d 9 = 1.00 n 6 = 1.83481 ν 6 = 42.7
r10 = 44.671 d10 = 0.15
r11 = 37.129 d11 = 5.32 n 7 = 1.83400 ν 7 = 37.2
r12 = -38.449 d12 = 1.23
r13 = -21.974 d13 = 0.90 n 8 = 1.80400 ν 8 = 46.6
r14 = 51.597 d14 = 4.84 n 9 = 1.80518 ν 9 = 25.4
r15 = -58.592 d15 = variable
r16 = 0.000 d16 = 0.50
r17 = 1326.585 d17 = 3.50 n10 = 1.58913 ν10 = 61.1
r18 = -44.639 d18 = 1.00
r19 = 0.000 (aperture) d19 = 1.25
r20 = 37.634 (aspherical surface) d20 = 10.25 n11 = 1.58313 ν11 = 59.4
r21 = -25.343 d21 = 2.50 n12 = 1.84666 ν12 = 23.9
r22 = -40.897 d22 = variable
r23 = -55.729 d23 = 3.15 n13 = 1.84666 ν13 = 23.9
r24 = -25.080 d24 = 0.80 n14 = 1.69680 ν14 = 55.5
r25 = 87.573 d25 = 5.64
r26 = -35.177 d26 = 1.20 n15 = 1.84666 ν15 = 23.9
r27 = -88.974 d27 = 2.26 n16 = 1.58913 ν16 = 61.1
r28 = -42.776 d28 = variable
r29 = 177.210 (aspherical surface) d29 = 0.08 n17 = 1.51640 ν17 = 52.2
r30 = 230.563 d30 = 1.32 n18 = 1.83400 ν18 = 37.2
r31 = 52.263 d31 = 6.98 n19 = 1.49700 ν19 = 81.5
r32 = -32.659 d32 = 0.15
r33 = 53.763 d33 = 8.90 n20 = 1.49700 ν20 = 81.5
r34 = -25.629 d34 = 1.70 n21 = 1.74950 ν21 = 35.3
r35 = -56.583
Focal length 17.50 32.51 53.05
Variable interval
d 5 3.82 18.81 34.96
d 15 20.08 6.46 0.75
d 22 1.30 7.91 10.99
d 28 10.40 3.79 0.71
Focus 34.90 42.32 48.26
Aspheric coefficient 6th surface bcde
2.002883e-05 -4.912051e-08 1.336013e-10 -9.191695e-14
20th bcde
-3.363478e-06 -1.015652e-08 4.412899e-11 -8.120484e-14
No. 29 bcde
-3.976386e-06 1.390626e-08 -5.283650e-11 1.089437e-13
数値実施例2
f=17.5~52.4 FNo=1: 1.8 2ω=75.9°~29.2°
f1= 190.160 d 1= 1.90 n 1=1.84666 ν 1=23.9
f2= 81.419 d 2= 8.75 n 2=1.60311 ν 2=60.6
f3= 5069.438 d 3= 0.15
f4= 66.608 d 4= 7.34 n 3=1.71300 ν 3=53.9
f5= 247.754 d 5= 可変
f6= 550.792(非球面)d 6= 0.05 n 4=1.51640 ν 4=52.2
f7= 110.050 d 7= 1.20 n 5=1.80400 ν 5=46.6
f8= 17.391 d 8= 7.58
f9= -48.026 d 9= 1.00 n 6=1.83481 ν 6=42.7
f10= 48.106 d10= 0.15
f11= 39.618 d11= 5.56 n 7=1.83400 ν 7=37.2
f12= -40.137 d12= 1.41
f13= -22.337 d13= 0.90 n 8=1.80400 ν 8=46.6
f14= 61.307 d14= 5.12 n 9=1.80518 ν 9=25.4
f15= -57.073 d15= 可変
f16= 0.000 d16= 0.50
f17= 10723.702 d17= 3.50 n10=1.72916 ν10=54.7
f18= -50.060 d18= 1.00
f19= 0.000(絞り) d19= 0.72
f20= 41.409(非球面)d20= 10.56 n11=1.67000 ν11=57.3
f21= -25.953 d21= 2.50 n12=1.84666 ν12=23.9
f22= -47.996 d22= 可変
f23= -52.529 d23= 3.77 n13=1.84666 ν13=23.9
f24= -22.526 d24= 0.80 n14=1.69680 ν14=55.5
f25= 64.388 d25= 4.64
f26= -32.416 d26= 1.20 n15=1.84666 ν15=23.9
f27= -91.548 d27= 2.47 n16=1.58913 ν16=61.1
f28= -39.357 d28= 可変
f29= 178.397(非球面)d29= 0.08 n17=1.51640 ν17=52.2
f30= 299.809 d30= 1.32 n18=1.83400 ν18=37.2
f31= 38.112 d31= 7.24 n19=1.49700 ν19=81.5
f32= -34.289 d32= 0.15
f33= 64.027 d33= 8.74 n20=1.49700 ν20=81.5
f34= -25.178 d34= 1.70 n21=1.74950 ν21=35.3
f35= -38.795
焦点距離 17.50 35.13 52.36
可変間隔
5 3.88 20.64 34.97
15 22.52 5.40 0.62
22 1.31 7.57 9.56
28 8.82 2.56 0.57
バックフォーカス 34.15 41.53 45.06
非球面係数
第 6面 b c d e
1.768530e-05 -4.243879e-08 1.095593e-10 -5.889812e-14
第20面 b c d e
-2.455696e-06 -8.880903e-09 3.126544e-11 -4.934542e-14
第29面 b c d e
-6.147791e-06 1.695386e-08 -5.202439e-11 9.176141e-14
Numerical example 2
f = 17.5 ~ 52.4 FNo = 1: 1.8 2ω = 75.9 ° ~ 29.2 °
f1 = 190.160 d 1 = 1.90 n 1 = 1.84666 ν 1 = 23.9
f2 = 81.419 d 2 = 8.75 n 2 = 1.60311 ν 2 = 60.6
f3 = 5069.438 d 3 = 0.15
f4 = 66.608 d 4 = 7.34 n 3 = 1.71300 ν 3 = 53.9
f5 = 247.754 d 5 = variable
f6 = 550.792 (aspherical surface) d 6 = 0.05 n 4 = 1.51640 ν 4 = 52.2
f7 = 110.050 d 7 = 1.20 n 5 = 1.80400 ν 5 = 46.6
f8 = 17.391 d 8 = 7.58
f9 = -48.026 d 9 = 1.00 n 6 = 1.83481 ν 6 = 42.7
f10 = 48.106 d10 = 0.15
f11 = 39.618 d11 = 5.56 n 7 = 1.83400 ν 7 = 37.2
f12 = -40.137 d12 = 1.41
f13 = -22.337 d13 = 0.90 n 8 = 1.80400 ν 8 = 46.6
f14 = 61.307 d14 = 5.12 n 9 = 1.80518 ν 9 = 25.4
f15 = -57.073 d15 = variable
f16 = 0.000 d16 = 0.50
f17 = 10723.702 d17 = 3.50 n10 = 1.72916 ν10 = 54.7
f18 = -50.060 d18 = 1.00
f19 = 0.000 (aperture) d19 = 0.72
f20 = 41.409 (aspherical surface) d20 = 10.56 n11 = 1.67000 ν11 = 57.3
f21 = -25.953 d21 = 2.50 n12 = 1.84666 ν12 = 23.9
f22 = -47.996 d22 = variable
f23 = -52.529 d23 = 3.77 n13 = 1.84666 ν13 = 23.9
f24 = -22.526 d24 = 0.80 n14 = 1.69680 ν14 = 55.5
f25 = 64.388 d25 = 4.64
f26 = -32.416 d26 = 1.20 n15 = 1.84666 ν15 = 23.9
f27 = -91.548 d27 = 2.47 n16 = 1.58913 ν16 = 61.1
f28 = -39.357 d28 = variable
f29 = 178.397 (aspherical surface) d29 = 0.08 n17 = 1.51640 ν17 = 52.2
f30 = 299.809 d30 = 1.32 n18 = 1.83400 ν18 = 37.2
f31 = 38.112 d31 = 7.24 n19 = 1.49700 ν19 = 81.5
f32 = -34.289 d32 = 0.15
f33 = 64.027 d33 = 8.74 n20 = 1.49700 ν20 = 81.5
f34 = -25.178 d34 = 1.70 n21 = 1.74950 ν21 = 35.3
f35 = -38.795
Focal length 17.50 35.13 52.36
Variable interval
5 3.88 20.64 34.97
15 22.52 5.40 0.62
22 1.31 7.57 9.56
28 8.82 2.56 0.57
Back focus 34.15 41.53 45.06
Aspheric coefficient 6th surface bcde
1.768530e-05 -4.243879e-08 1.095593e-10 -5.889812e-14
20th bcde
-2.455696e-06 -8.880903e-09 3.126544e-11 -4.934542e-14
No. 29 bcde
-6.147791e-06 1.695386e-08 -5.202439e-11 9.176141e-14
数値実施例3
f=17.5~53.2 FNo=1: 2.0 2ω=75.9°~28.8°
r 1= 260.554 d 1= 1.90 n 1=1.84666 ν 1=23.9
r 2= 88.246 d 2= 9.09 n 2=1.60311 ν 2=60.6
r 3= -613.875 d 3= 0.15
r 4= 68.079 d 4= 6.76 n 3=1.71300 ν 3=53.9
r 5= 221.932 d 5= 可変
r 6= 205.679(非球面)d 6= 0.05 n 4=1.51640 ν 4=52.2
r 7= 91.529 d 7= 1.20 n 5=1.80400 ν 5=46.6
r 8= 16.888 d 8= 7.57
r 9= -44.189 d 9= 1.00 n 6=1.83481 ν 6=42.7
r10= 52.123 d10= 0.15
r11= 40.165 d11= 5.40 n 7=1.83400 ν 7=37.2
r12= -39.424 d12= 1.19
r13= -23.597 d13= 0.90 n 8=1.80400 ν 8=46.6
r14= 47.819 d14= 4.98 n 9=1.80518 ν 9=25.4
r15= -73.294 d15= 可変
r16= 0.000 d16= 0.50
r17= 923.728 d17= 3.50 n10=1.69680 ν10=55.5
r18= -52.254 d18= 1.00
r19= 0.000(絞り) d19= 1.50
r20= 39.050(非球面)d20= 9.51 n11=1.64250 ν11=58.4
r21= -32.295 d21= 2.50 n12=1.84666 ν12=23.9
r22= -57.114 d22= 可変
r23= -61.321 d23= 3.07 n13=1.85026 ν13=32.3
r24= -26.819 d24= 0.80 n14=1.69350 ν14=50.8
r25= 58.010 d25= 4.54
r26= -34.752 d26= 1.50 n15=1.67790 ν15=55.3
r27= -46.039 d27= 可変
r28= 262.249(非球面)d28= 1.40 n17=1.83400 ν17=37.2
r29= 34.067 d29= 7.64 n18=1.49700 ν18=81.5
r30= -34.077 d30= 0.15
r31= 43.644 d31= 10.40 n19=1.49700 ν19=81.5
r32= -23.572 d32= 1.70 n20=1.74950 ν20=35.3
r33= -42.360
焦点距離 17.50 33.37 53.23
可変間隔
d 5 3.98 19.92 36.51
d 15 20.72 6.16 0.83
d 22 1.67 9.25 12.74
d 27 11.86 4.27 0.79
バックフォーカス 34.91 42.42 47.76
非球面係数
第 6面 b c d e
1.483514e-05 -2.308293e-08 3.015758e-11 5.248698e-14
第20面 b c d e
-2.793026e-06 -1.127800e-08 4.180611e-11 -6.945377e-14
第28面 b c d e
-1.397353e-06 1.589995e-08 -5.178367e-11 1.100395e-13
Numerical example 3
f = 17.5 ~ 53.2 FNo = 1: 2.0 2ω = 75.9 ° ~ 28.8 °
r 1 = 260.554 d 1 = 1.90 n 1 = 1.84666 ν 1 = 23.9
r 2 = 88.246 d 2 = 9.09 n 2 = 1.60311 ν 2 = 60.6
r 3 = -613.875 d 3 = 0.15
r 4 = 68.079 d 4 = 6.76 n 3 = 1.71300 ν 3 = 53.9
r 5 = 221.932 d 5 = variable
r 6 = 205.679 (aspherical surface) d 6 = 0.05 n 4 = 1.51640 ν 4 = 52.2
r 7 = 91.529 d 7 = 1.20 n 5 = 1.80400 ν 5 = 46.6
r 8 = 16.888 d 8 = 7.57
r 9 = -44.189 d 9 = 1.00 n 6 = 1.83481 ν 6 = 42.7
r10 = 52.123 d10 = 0.15
r11 = 40.165 d11 = 5.40 n 7 = 1.83400 ν 7 = 37.2
r12 = -39.424 d12 = 1.19
r13 = -23.597 d13 = 0.90 n 8 = 1.80400 ν 8 = 46.6
r14 = 47.819 d14 = 4.98 n 9 = 1.80518 ν 9 = 25.4
r15 = -73.294 d15 = variable
r16 = 0.000 d16 = 0.50
r17 = 923.728 d17 = 3.50 n10 = 1.69680 ν10 = 55.5
r18 = -52.254 d18 = 1.00
r19 = 0.000 (aperture) d19 = 1.50
r20 = 39.050 (aspherical surface) d20 = 9.51 n11 = 1.64250 ν11 = 58.4
r21 = -32.295 d21 = 2.50 n12 = 1.84666 ν12 = 23.9
r22 = -57.114 d22 = variable
r23 = -61.321 d23 = 3.07 n13 = 1.85026 ν13 = 32.3
r24 = -26.819 d24 = 0.80 n14 = 1.69350 ν14 = 50.8
r25 = 58.010 d25 = 4.54
r26 = -34.752 d26 = 1.50 n15 = 1.67790 ν15 = 55.3
r27 = -46.039 d27 = variable
r28 = 262.249 (aspherical surface) d28 = 1.40 n17 = 1.83400 ν17 = 37.2
r29 = 34.067 d29 = 7.64 n18 = 1.49700 ν18 = 81.5
r30 = -34.077 d30 = 0.15
r31 = 43.644 d31 = 10.40 n19 = 1.49700 ν19 = 81.5
r32 = -23.572 d32 = 1.70 n20 = 1.74950 ν20 = 35.3
r33 = -42.360
Focal length 17.50 33.37 53.23
Variable interval
d 5 3.98 19.92 36.51
d 15 20.72 6.16 0.83
d 22 1.67 9.25 12.74
d 27 11.86 4.27 0.79
Back focus 34.91 42.42 47.76
Aspheric coefficient 6th surface bcde
1.483514e-05 -2.308293e-08 3.015758e-11 5.248698e-14
20th bcde
-2.793026e-06 -1.127800e-08 4.180611e-11 -6.945377e-14
28th bcde
-1.397353e-06 1.589995e-08 -5.178367e-11 1.100395e-13
次に実施例１〜３に示したズームレンズを撮像装置に適用した実施例を図１０を用いて説明する。 Next, an embodiment in which the zoom lens shown in Embodiments 1 to 3 is applied to an imaging apparatus will be described with reference to FIG.
図１０は一眼レフカメラの要部概略図である。図１０において、１０は実施例１〜３のズームレンズ１を有する撮影レンズである。ズームレンズ１は保持部材である鏡筒２に保持されている。２０はカメラ本体である。３は撮影レンズ１０からの光束を上方に反射するクイックリターンミラーである。４は撮影レンズ１０の像形成位置に配置された焦点板である。５は焦点板４に形成された逆像を正立像に変換するペンタダハプリズムである。６はその正立像を観察するための接眼レンズである。７は感光面であり、ＣＣＤセンサやＣＭＯＳセンサ等の像を受光する固体撮像素子（光電変換素子）や銀塩フィルムが配置される。撮影時にはクイックリターンミラー３が光路から退避して、感光面７上に撮影レンズ１０によって像が形成される。 FIG. 10 is a schematic view of the main part of a single-lens reflex camera. In FIG. 10, reference numeral 10 denotes a photographing lens having the zoom lens 1 according to the first to third embodiments. The zoom lens 1 is held by a lens barrel 2 that is a holding member. Reference numeral 20 denotes a camera body. A quick return mirror 3 reflects the light beam from the photographing lens 10 upward. Reference numeral 4 denotes a focusing screen disposed at an image forming position of the photographing lens 10. A penta roof prism 5 converts a reverse image formed on the focusing screen 4 into an erect image. Reference numeral 6 denotes an eyepiece for observing the erect image. Reference numeral 7 denotes a photosensitive surface, on which a solid-state imaging device (photoelectric conversion device) for receiving an image such as a CCD sensor or a CMOS sensor or a silver salt film is disposed. At the time of photographing, the quick return mirror 3 is retracted from the optical path, and an image is formed on the photosensitive surface 7 by the photographing lens 10.
実施例１〜３にて説明した利益は、本実施例に開示したような撮像装置において効果的に享受される。 The benefits described in the first to third embodiments are effectively enjoyed in the imaging apparatus as disclosed in the present embodiment.
Ｌ１ 第１レンズ群
Ｌ２ 第２レンズ群
Ｌ３ 第３レンズ群
Ｌ４ 第４レンズ群
Ｌ５ 第５レンズ群
ＳＳＰ フレアーカット絞り
ＳＰ 絞り
ＩＰ 像面
ｄ ｄ線
ｇ ｇ線
Ｃ Ｃ線
Ｆ Ｆ線
Ｓ・Ｃ 正弦条件
ΔｄＭ ｄ線のメリディオナル像面
ΔｄＳ ｄ線のサジタル像面
L1 1st lens group L2 2nd lens group L3 3rd lens group L4 4th lens group L5 5th lens group SSP Flare cut diaphragm SP Aperture IP Image surface d d line g g line C C line FF line S / C sine Condition ΔdM d-line meridional image plane ΔdS d-line sagittal image plane
Claims (7)
広角端と望遠端における全系の焦点距離を各々ｆＷ、ｆＴ、
第２レンズ群と第３レンズ群の焦点距離を各々ｆ２、ｆ３とするとき、
The focal lengths of the entire system at the wide-angle end and the telephoto end are fW, fT,
When the focal lengths of the second lens group and the third lens group are f2 and f3, respectively.
０．８５ ＜ ｜ｆ２｜／ｆＷ ＜ １．２０
０．２９ ＜ ｜ｆ２｜／ｆＴ ＜ ０．４０
０．４７ ＜ ｆ３ ／ｆＴ ＜ ０．６０
なる条件を満足することを特徴とする請求項１のズームレンズ。 The focal lengths f2 and f3 of the second lens group and the third lens group are 0.85 <| f2 | / fW <1.20.
0.29 <| f2 | / fT <0.40
0.47 <f3 / fT <0.60
The zoom lens according to claim 1, wherein the following condition is satisfied.
１．４ ＜ ｆ３ ／ｆＷ ＜ １．７
１．８ ＜ ｜ｆ４｜／ｆＷ ＜ ２．８
２．０ ＜ ｆ５ ／ｆＷ ＜ ２．４
なる条件を満足することを特徴とする請求項１又は２のズームレンズ。 When the focal lengths of the fourth lens group and the fifth lens group are f4 and f5, respectively.
1.4 <f3 / fW <1.7
1.8 <| f4 | / fW <2.8
2.0 <f5 / fW <2.4
The zoom lens according to claim 1, wherein the following condition is satisfied.
５．８ ＜ ｆ１ ／ｆＷ ＜ ７．６
なる条件式を満足することを特徴とする請求項１、２又は３のズームレンズ。 The first lens group includes a meniscus negative lens, a positive lens, and a positive lens in order from the object side to the image side, and the second lens group includes a meniscus negative lens and a biconcave shape in order from the object side to the image side. Negative lens, positive lens, and lens unit having negative refractive power as a whole. The third lens group includes at least one aspherical lens surface, at least two positive lenses, and one negative lens. When the focal length of the first lens group is f1, 5.8 <f1 / fW <7.6
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.
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|---|---|---|---|
| JP2008173292A JP2010014866A (en) | 2008-07-02 | 2008-07-02 | Zoom lens and imaging apparatus having the same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008173292A JP2010014866A (en) | 2008-07-02 | 2008-07-02 | Zoom lens and imaging apparatus having the same |
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|---|---|
| JP2010014866A true JP2010014866A (en) | 2010-01-21 |
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|---|---|---|---|
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9235036B2 (en) | 2013-05-31 | 2016-01-12 | Sony Corporation | Zoom lens and imaging apparatus |
| JP2016099586A (en) * | 2014-11-26 | 2016-05-30 | リコーイメージング株式会社 | Zoom lens system |
| JP2019138941A (en) * | 2018-02-06 | 2019-08-22 | キヤノン株式会社 | Zoom lens and image capturing device having the same |
| CN113253414A (en) * | 2021-06-29 | 2021-08-13 | 成都极米科技股份有限公司 | Projection optical system |
-
2008
- 2008-07-02 JP JP2008173292A patent/JP2010014866A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9235036B2 (en) | 2013-05-31 | 2016-01-12 | Sony Corporation | Zoom lens and imaging apparatus |
| JP2016099586A (en) * | 2014-11-26 | 2016-05-30 | リコーイメージング株式会社 | Zoom lens system |
| JP2019138941A (en) * | 2018-02-06 | 2019-08-22 | キヤノン株式会社 | Zoom lens and image capturing device having the same |
| US11067779B2 (en) | 2018-02-06 | 2021-07-20 | Canon Kabushiki Kaisha | Zoom lens and image pickup apparatus including the same |
| CN113253414A (en) * | 2021-06-29 | 2021-08-13 | 成都极米科技股份有限公司 | Projection optical system |
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