JP3493406B2 - Imaging device - Google Patents
Imaging deviceInfo
- Publication number
- JP3493406B2 JP3493406B2 JP2000265716A JP2000265716A JP3493406B2 JP 3493406 B2 JP3493406 B2 JP 3493406B2 JP 2000265716 A JP2000265716 A JP 2000265716A JP 2000265716 A JP2000265716 A JP 2000265716A JP 3493406 B2 JP3493406 B2 JP 3493406B2
- Authority
- JP
- Japan
- Prior art keywords
- lens
- lens group
- plastic
- focal length
- power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Description
【０００１】[0001]
【発明の属する技術分野】本発明は、撮像装置に関する
ものであり、更に詳しくは、特に携帯情報端末や携帯電
話に内蔵される、デジタルカメラやデジタルビデオユニ
ット等の撮像装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image pickup apparatus, and more particularly to an image pickup apparatus such as a digital camera or a digital video unit built in a portable information terminal or a mobile phone.
【０００２】[0002]
【従来の技術】近年、ＰＤＡ（personal digital assis
tant）と呼ばれる携帯情報端末や、携帯電話が爆発的に
普及し、それらに内蔵されるデジタルカメラやデジタル
ビデオユニット等の撮像装置が増えてきている。これら
は撮像素子にＣＣＤやＣＭＯＳセンサーを使い、コンパ
クトなものとなっている。このような撮像素子は、技術
の進歩により年々小型化しており、撮像レンズ系もこれ
に応じてさらなる小型化を図っていく必要がある。2. Description of the Related Art In recent years, PDA (personal digital assis)
The portable information terminals called "tant)" and mobile phones have explosively spread, and the number of imaging devices such as digital cameras and digital video units built into them has increased. These are compact by using CCD or CMOS sensor as an image pickup element. Such image pickup devices have been downsized year by year due to technological advances, and it is necessary to further downsize the image pickup lens system accordingly.
【０００３】従来より、レンズ枚数が少なく、受光エリ
アの小さなデジタルカメラ，ビデオカメラ用の、小型の
ズームレンズとしては、以下に示すような構成のものが
ある。例えば特開平３−１５８８１７号公報に記載され
ている如く、物体側より順に、負のパワーを持つ第１レ
ンズ群と、それぞれ正のパワーを持つ第２レンズ群，第
３レンズ群，第４レンズ群と、第３レンズ群よりも像側
に配置された絞りとよりなり、各レンズ群間の間隔を変
化させて変倍を行う、いわゆる負正正正の４成分ズーム
レンズが開示されている。Conventionally, there have been the following small zoom lenses for digital cameras and video cameras having a small number of lenses and a small light receiving area. For example, as described in Japanese Patent Application Laid-Open No. 3-158817, a first lens group having negative power, a second lens group, a third lens group, and a fourth lens having positive power, respectively, in this order from the object side. A so-called negative-positive-positive four-component zoom lens, which is composed of a lens group and a diaphragm arranged closer to the image side than the third lens group, is used to perform zooming by changing the distance between the lens groups. .
【０００４】これは、第１レンズ群がズーミング時に固
定であるため、メカニズム構成が容易で堅牢性に富み、
また移動するレンズ群が少ないため、低コストでコンパ
クトなズームレンズとなっている。そして、ズーム比は
３倍を達成している。また、同じタイプの光学系とし
て、例えば特開平１１−２４９０１６号公報に記載され
ている如く、第１レンズ群，第２レンズ群，第３レンズ
群がそれぞれ１枚、第４レンズ群が２枚の合計５枚とい
う、レンズ枚数の少ない構成のものが提案されている。This is because the first lens group is fixed during zooming, so the mechanism structure is easy and the robustness is high.
Moreover, since there are few moving lens groups, the zoom lens is a low-cost and compact zoom lens. And the zoom ratio has achieved 3 times. Further, as an optical system of the same type, as described in, for example, Japanese Patent Application Laid-Open No. 11-249016, each of the first lens group, the second lens group, the third lens group is one, and the fourth lens group is two. A total of five lenses is proposed, which has a small number of lenses.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記特
開平３−１５８８１７号公報に記載されているような構
成では、トータルのレンズ枚数が多く、また第２レンズ
群のパワーが弱いため、コンパクト性が不十分である。
また、上記特開平１１−２４９０１６号公報に記載され
ているような構成では、ズーム比が２倍とやや小さく、
また第４レンズ群が２枚構成であり、これもコンパクト
性が不十分である。However, in the configuration as described in the above-mentioned Japanese Patent Laid-Open No. 3-158817, the total number of lenses is large and the power of the second lens group is weak, so that compactness is not achieved. Is insufficient.
Further, in the configuration as described in Japanese Patent Laid-Open No. 11-249016, the zoom ratio is a little smaller than twice,
Further, the fourth lens group has a double-lens structure, which is also insufficient in compactness.
【０００６】本発明は、このような問題点に鑑み、低コ
ストでしかもコンパクトであり、さらにはＦナンバーが
小さくてズーム比が大きいズームレンズを備えた撮像装
置を提供する事を目的とする。In view of the above problems, it is an object of the present invention to provide an image pickup apparatus equipped with a zoom lens which is low in cost and compact and which has a small F number and a large zoom ratio.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に、本発明では、物体からの光を光学像として形成する
ズームレンズ系と、そのズームレンズ系によって形成さ
れた前記光学像を電子映像信号に変換する撮像素子と、
を備えた撮像装置であって、前記ズームレンズ系は、物
体側から順に、負のパワーを有する第１レンズ群，正の
パワーを有する第２レンズ群，正のパワーを有する第３
レンズ群，及び正のパワーを有する第４レンズ群より成
り、第１レンズ群，第４レンズ群が固定で、第２レンズ
群，第３レンズ群が、各レンズ群間隔を変えるように光
軸上を移動する事により変倍を行う構成において、第２
レンズ群、或いは第３レンズ群に絞りを備え、前記第４
レンズ群は１枚の正レンズより成るとともに、以下の条
件式を満足する事を特徴とする。
０．３＜ｆ２／ｆｔ＜１．４０．４＜ｔ４／ｙ′＜１．５
０．８＜ｆ４／ｆｗ＜４．０
但し、
ｆ２：第２レンズ群の焦点距離
ｆｔ：望遠端における全系の焦点距離ｔ４：第４レンズ群のレンズ芯厚 ｙ′：対角像高
ｆ４：第４レンズ群の焦点距離
ｆｗ：広角端における全系の焦点距離
である。To achieve the above object, in the present invention, a zoom lens system for forming light from an object as an optical image, and the optical image formed by the zoom lens system are electronically imaged. An image sensor for converting into a signal,
The zoom lens system includes, in order from the object side, a first lens group having negative power, a second lens group having positive power, and a third lens group having positive power.
A lens group and a fourth lens group having a positive power, the first lens group and the fourth lens group are fixed, and the second lens group and the third lens group have optical axes that change the distance between the lens groups. In the configuration in which zooming is performed by moving up, the second
The lens group or the third lens group is provided with an aperture,
The lens group is composed of one positive lens and is characterized by satisfying the following conditional expression. 0.3 <f2 / ft <1.4 0.4 <t4 / y ′ <1.5 0.8 <f4 / fw <4.0 However, f2: focal length of the second lens group ft: at the telephoto end Focal length t4 of the entire system : lens core thickness y'of the fourth lens group y: diagonal image height f4: focal length of the fourth lens group fw: focal length of the entire system at the wide-angle end.
【０００８】また、前記第１レンズ群は１枚の負レンズ
より成り、その負レンズの像側の面は負のパワーを持つ
非球面である事を特徴とする。The first lens group is composed of one negative lens, and the image side surface of the negative lens is an aspherical surface having negative power.
【０００９】[0009]
【００１０】また、前記各レンズ群はそれぞれ１枚のレ
ンズより成る事を特徴とする。 Further, each lens group has one lens.
It is characterized by being composed of
【００１１】また、前記第１レンズ群中に、少なくとも
１枚の負のパワーを持つプラスチックレンズを有し、前
記第２レンズ群中に、少なくとも１枚の正のパワーを持
つプラスチックレンズを備え、以下の条件式を満足する
事を特徴とする。 νｄ G1 ＞４０ 但し、 νｄ G1 ：第１レンズ群中の、少なくとも１枚の負のパワ
ーを持つプラスチッ クレンズの分散値 である。 In the first lens group, at least
With one negative power plastic lens, front
At least one positive power in the second lens group
Equipped with two plastic lenses, the following conditional expressions are satisfied
Characterize things. νd G1 > 40 However, νd G1 : at least one negative power in the first lens group
Is a dispersion value of plastic Cleanse with over.
【００１２】さらに、以下の条件式を満足する事を特徴
とする。 ０．７＜｜Ｆ１／Ｆ２｜＜１．４ 但し、 Ｆ１：第１レンズ群中の負のパワーを持つプラスチック
レンズの焦点距離 Ｆ２：第２レンズ群中の正のパワーを持つプラスチック
レンズの焦点距離 である。 Further, it is characterized in that the following conditional expressions are satisfied.
And 0.7 <| F1 / F2 | <1.4 However, F1: plastic with negative power in the first lens group
Lens focal length F2: Plastic with positive power in the second lens group
The focal length of the lens .
【００１３】また、前記第１レンズ群中に、少なくとも
１枚の負のパワーを持つプラスチックレンズを有し、前
記第３レンズ群中に、少なくとも１枚の正のパワーを持
つプラスチックレンズを備え、以下の条件式を満足する
事を特徴とする。 νｄ G1 ＞４０ 但し、 νｄ G1 ：第１レンズ群中の、少なくとも１枚の負のパワ
ーを持つプラスチッ クレンズの分散値 である。 In the first lens group, at least
With one negative power plastic lens, front
Note At least one positive power in the third lens group
Equipped with two plastic lenses, the following conditional expressions are satisfied
Characterize things. νd G1 > 40 However, νd G1 : at least one negative power in the first lens group
Is a dispersion value of plastic Cleanse with over.
【００１４】さらに、以下の条件式を満足する事を特徴
とする。 ０．３＜｜Ｆ１／Ｆ３｜＜１．０ 但し、 Ｆ１：第１レンズ群中の負のパワーを持つプラスチック
レンズの焦点距離 Ｆ３：第３レンズ群中の正のパワーを持つプラスチック
レンズの焦点距離 である。 Further, it is characterized in that the following conditional expression is satisfied.
And 0.3 <| F1 / F3 | <1.0 However, F1: plastic with negative power in the first lens group
Lens focal length F3: Plastic with positive power in the third lens group
The focal length of the lens .
【００１５】[0015]
【００１６】[0016]
【００１７】[0017]
【発明の実施の形態】以下、本発明の実施の形態につい
て、図面を参照しながら説明する。図１〜図６は、それ
ぞれ第１〜第６の実施形態の撮像装置におけるズームレ
ンズの光学系の構成を示している。各図の左側が物体
側、右側が像側である。なお、各図中の矢印は、ズーミ
ング時の各レンズ群の広角端から望遠端への移動の様子
を模式的に表したものである。破線で表す矢印は、移動
しない事を示している。また、各図はそのズーミング時
の広角端の状態を示している。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 show the configurations of optical systems of zoom lenses in the image pickup apparatuses of the first to sixth embodiments, respectively. The left side of each figure is the object side, and the right side is the image side. The arrows in each figure schematically show the movement of each lens unit from the wide-angle end to the telephoto end during zooming. The arrow indicated by a broken line indicates that the arrow does not move. In addition, each drawing shows the state at the wide-angle end during zooming.
【００１８】そして、各図に示すように、各実施形態は
負正正正４成分ズームであり、物体側から順に、第１レ
ンズ群Ｇ１，第２レンズ群Ｇ２，第３レンズ群Ｇ３，及
び第４レンズ群Ｇ４から構成され、第１レンズ群，第４
レンズ群が固定で、第２レンズ群，第３レンズ群が、各
レンズ群間隔を変えるように光軸上を移動する事により
変倍を行うタイプである。As shown in the respective drawings, each embodiment is a negative, positive, positive, positive four-component zoom, and in order from the object side, the first lens group G1, the second lens group G2, the third lens group G3, and The fourth lens group G4 includes the first lens group G4
This is a type in which the lens groups are fixed, and the second lens group and the third lens group move on the optical axis so as to change the distance between the lens groups to perform zooming.
【００１９】Ｇ１は全体として負のパワーを有する。ま
た、Ｇ２，Ｇ３，及びＧ４はそれぞれ全体として正のパ
ワーを有する。さらに、物体側から順に、１枚目〜６枚
目のレンズをそれぞれＬ１〜Ｌ６とする。各実施形態の
各レンズ群は、それぞれ各レンズを適宜組み合わせた構
成となっている。そして、Ｇ２或いはＧ３には絞りＳが
含まれている。なお、像側端部の平行平板はローパスフ
ィルターＬＰＦである。また、光軸をＸとする。G1 has a negative power as a whole. Also, G2, G3, and G4 each have positive power as a whole. Further, the first to sixth lenses are referred to as L1 to L6 in order from the object side. Each lens group of each embodiment has a configuration in which each lens is appropriately combined. The aperture S is included in G2 or G3. The parallel plate at the image side end is a low pass filter LPF. The optical axis is X.
【００２０】一般に、ズームレンズの光学系において、
物体側に負レンズ群を配置したいわゆるマイナスリード
と呼ばれるタイプは、第１レンズ群の有効径が各レンズ
群の中で最も大きくなる。従って、メカニズム構成も含
めたコンパクトな鏡胴ユニットを実現するためには、よ
り径の小さい第２レンズ群，第３レンズ群をズーミング
における可動レンズ群とする事が望ましい。本発明で
は、第１レンズ群，第４レンズ群を固定とし、ズーミン
グにおける可動レンズ群を第２レンズ群，第３レンズ群
の２つにする事で、コンパクトで簡易な構成のズームレ
ンズを実現している。Generally, in the optical system of a zoom lens,
In the so-called negative lead type in which the negative lens group is arranged on the object side, the effective diameter of the first lens group is the largest in each lens group. Therefore, in order to realize a compact lens barrel unit including the mechanism structure, it is desirable to make the second lens group and the third lens group having smaller diameters movable lens groups during zooming. According to the present invention, the first lens group and the fourth lens group are fixed, and the movable lens groups for zooming are the second lens group and the third lens group, thereby realizing a compact and simple zoom lens. is doing.
【００２１】なお、第１の実施形態では、図１に示す物
体側から１枚目（Ｌ１），２枚目（Ｌ２），及び４枚目
（Ｌ４）のレンズがプラスチックレンズである。また、
第２の実施形態では、図２に示す物体側から１枚目（Ｌ
１），２枚目（Ｌ２），及び４枚目（Ｌ４）のレンズが
プラスチックレンズである。また、第３の実施形態で
は、図３に示す物体側から１枚目（Ｌ１），２枚目（Ｌ
２），及び５枚目（Ｌ５）のレンズがプラスチックレン
ズである。また、第４の実施形態では、図４に示す物体
側から１枚目（Ｌ１），及び６枚目（Ｌ６）のレンズが
プラスチックレンズである。また、第５の実施形態で
は、図５に示す物体側から１枚目（Ｌ１），及び４枚目
（Ｌ４）のレンズがプラスチックレンズである。また、
第６の実施形態では、図６に示す物体側から１枚目（Ｌ
１），及び４枚目（Ｌ４）のレンズがプラスチックレン
ズである。In the first embodiment, the first lens (L1), the second lens (L2), and the fourth lens (L4) from the object side shown in FIG. 1 are plastic lenses. Also,
In the second embodiment, the first sheet (L
The first lens, the second lens (L2), and the fourth lens (L4) are plastic lenses. Further, in the third embodiment, the first sheet (L1) and the second sheet (L1) from the object side shown in FIG.
The second and fifth (L5) lenses are plastic lenses. Further, in the fourth embodiment, the first lens (L1) and the sixth lens (L6) from the object side shown in FIG. 4 are plastic lenses. In addition, in the fifth embodiment, the first (L1) and fourth (L4) lenses from the object side shown in FIG. 5 are plastic lenses. Also,
In the sixth embodiment, the first sheet (L
The lenses 1) and 4th (L4) are plastic lenses.
【００２２】以下に、本発明の撮像装置におけるズーム
レンズの光学系についての望ましい条件を記す。本発明
では、物体側から順に、負のパワーを有する第１レンズ
群，正のパワーを有する第２レンズ群，正のパワーを有
する第３レンズ群，及び正のパワーを有する第４レンズ
群より成り、第１レンズ群，第４レンズ群が固定で、第
２レンズ群，第３レンズ群が、各レンズ群間隔を変える
ように光軸上を移動する事により変倍を行う構成におい
て、以下の条件式（１）を満足する事により、低コスト
でコンパクトなズームレンズを実現する事ができる。
０．３＜ｆ２／ｆｔ＜１．４ （１）
但し、
ｆ２：第２レンズ群の焦点距離
ｆｔ：望遠端における全系の焦点距離
である。The desirable conditions for the optical system of the zoom lens in the image pickup apparatus of the present invention will be described below. In the present invention, in order from the object side, the first lens group having negative power, the second lens group having positive power, the third lens group having positive power, and the fourth lens group having positive power In the configuration in which the first lens group and the fourth lens group are fixed, and the second lens group and the third lens group move on the optical axis so as to change the distance between the lens groups, zooming is performed. By satisfying the conditional expression (1), it is possible to realize a low-cost and compact zoom lens. 0.3 <f2 / ft <1.4 (1) where, f2: focal length of the second lens group ft: focal length of the entire system at the telephoto end.
【００２３】条件式（１）の下限値以下になると、第２
レンズ群のパワーが強くなりすぎ、望遠端において第２
レンズ群で発生するアンダーの球面収差を、全系で補正
する事ができなくなる。逆に、上限値以上になると、第
２レンズ群のパワーが弱くなりすぎ、全系の大きさを小
さくする事が困難となる。If the lower limit of conditional expression (1) is reached, the second
The power of the lens group becomes too strong and the second lens is used at the telephoto end.
Under spherical aberration that occurs in the lens group cannot be corrected by the entire system. On the other hand, if the upper limit is exceeded, the power of the second lens group becomes too weak, and it becomes difficult to reduce the size of the entire system.
【００２４】また、特に、有効領域が比較的小さい撮像
素子用の光学系においては、その絶対寸法が小さいもの
となるため、各レンズ群における光軸上の長さを短くす
る事が、光学系全長の短縮に最も効果的となる。そし
て、各レンズ群における光軸上の長さを短くするために
は、レンズの構成枚数を減らす事が最も効果的である。
一方、本発明におけるようないわゆる負レンズ群先行タ
イプの光学系では、その第１レンズ群に比較的強い負の
パワーを持たせる必要がある。ところが、レンズの構成
枚数を減らすために、第１レンズ群を負レンズ１枚で構
成する場合、その強い負のパワーを物体側に持たせる
と、軸外入射光線を強く曲げすぎる事となり、発生する
軸外収差を除去する事ができなくなる。Further, in particular, in an optical system for an image pickup device having a relatively small effective area, the absolute size thereof is small. Therefore, it is necessary to shorten the length on the optical axis of each lens group. Most effective for shortening the total length. In order to shorten the length on the optical axis of each lens group, it is most effective to reduce the number of lenses.
On the other hand, in the so-called negative lens group preceding type optical system according to the present invention, it is necessary to give the first lens group a relatively strong negative power. However, in order to reduce the number of constituent lenses, if the first lens unit is composed of one negative lens, and if a strong negative power is given to the object side, the off-axis incident light beam will be bent too much, which will occur. It becomes impossible to remove the off-axis aberration that occurs.
【００２５】そこで、その負レンズの物体側には弱い負
のパワー若しくは正のパワーを持たせ、軸外入射光線を
強く曲げる事のないようにし、且つ、軸外の光線高さが
比較的小さくなる第１レンズ群（ここでの負レンズ）の
像側の面に、強い負のパワーを持たせる事により、軸外
収差を良好に補正する事ができる。さらに、この負レン
ズの像側の面を非球面とする事で、特に広角端での歪曲
収差を除去する事ができ、歪みのない良好な画質の映像
を提供する事ができる。Therefore, the object side of the negative lens is provided with a weak negative power or a positive power so that the off-axis incident light beam is not strongly bent, and the off-axis light beam height is relatively small. By giving a strong negative power to the image-side surface of the first lens group (the negative lens here), the off-axis aberration can be satisfactorily corrected. Furthermore, by making the image-side surface of this negative lens an aspherical surface, it is possible to eliminate distortion, especially at the wide-angle end, and it is possible to provide an image with good image quality without distortion.
【００２６】また本発明では、物体側から順に、負のパ
ワーを有する第１レンズ群，正のパワーを有する第２レ
ンズ群，正のパワーを有する第３レンズ群，及び正のパ
ワーを有する第４レンズ群より成り、第１レンズ群，第
４レンズ群が固定で、第２レンズ群，第３レンズ群が、
各レンズ群間隔を変えるように光軸上を移動する事によ
り変倍を行う構成において、第４レンズ群を１枚の正レ
ンズで構成し、以下の条件式（２）を満足する事によ
り、コンパクトなズームレンズを実現する事ができる。
０．４＜ｔ４／ｙ′＜１．５ （２）
但し、
ｔ４：第４レンズ群のレンズ芯厚
ｙ′：対角像高
である。Further, in the present invention, in order from the object side, the first lens group having negative power, the second lens group having positive power, the third lens group having positive power, and the first lens group having positive power. It is composed of four lens groups, the first lens group and the fourth lens group are fixed, and the second lens group and the third lens group are
In the configuration in which zooming is performed by moving on the optical axis so as to change the distance between the lens groups, by constructing the fourth lens group with one positive lens and satisfying the following conditional expression (2), It is possible to realize a compact zoom lens. 0.4 <t4 / y ′ <1.5 (2) where, t4: lens core thickness of the fourth lens group y ′: diagonal image height.
【００２７】特に、有効領域が比較的小さい撮像素子用
の光学系においては、その絶対寸法が小さいものとなる
ため、各レンズ群における光軸上の長さを短くする事
が、光学系全長の短縮に最も効果的となる。そして、各
レンズ群における光軸上の長さを短くするためには、レ
ンズの構成枚数を減らす事が最も効果的である。本発明
では、固定の第４レンズ群は、軸外光の主光線を光軸と
平行に近づける働きをしている。ここでは変倍や像面補
正機能を有していないため、比較的弱いパワーとなって
いる。従って、ここでのレンズは２枚構成で色収差補正
をする必要はなく、１枚構成にする事で、全系の大きさ
を小さくする事ができる。Particularly, in an optical system for an image pickup device having a relatively small effective area, the absolute size thereof is small. Therefore, it is necessary to shorten the length on the optical axis of each lens group to reduce the total length of the optical system. Most effective for shortening. In order to shorten the length on the optical axis of each lens group, it is most effective to reduce the number of lenses. In the present invention, the fixed fourth lens group serves to bring the principal ray of off-axis light closer to parallel to the optical axis. Here, the power is comparatively weak because it does not have a variable power and an image plane correction function. Therefore, it is not necessary to correct the chromatic aberration with the two lenses here, and the size of the entire system can be reduced by using one lens.
【００２８】条件式（２）の下限値以下になると、第４
レンズ群における正レンズの芯厚が薄くなりすぎ、これ
をガラスレンズとした場合は割れる危険が生じ、またプ
ラスチックモールドレンズとした場合は、成形時に樹脂
が均一に金型内を流れにくくなるので、いずれにせよレ
ンズの製造が困難となる。逆に、上限値以上になると、
第４レンズ群における正レンズの芯厚が厚くなりすぎ、
全系の大きさを小さくする事ができなくなる。If the lower limit of conditional expression (2) is not reached, the fourth
The core thickness of the positive lens in the lens group becomes too thin, and when this is a glass lens, there is a risk of cracking, and when it is a plastic molded lens, it becomes difficult for the resin to uniformly flow in the mold during molding, In any case, it becomes difficult to manufacture the lens. On the other hand, when the value exceeds the upper limit,
The core thickness of the positive lens in the fourth lens group becomes too thick,
It becomes impossible to reduce the size of the whole system.
【００２９】さらに本発明では、上述した、第４レンズ
群を１枚の正レンズで構成し、条件式（２）を満足する
場合に、更に以下の条件式（３）を満足する事により、
いわゆるデジタル撮像センサーに適した、性能の良好な
ズームレンズを実現する事ができる。
０．８＜ｆ４／ｆｗ＜４．０ （３）
但し、
ｆ４：第４レンズ群の焦点距離
ｆｗ：広角端における全系の焦点距離
である。Further, in the present invention, when the fourth lens group is composed of one positive lens and the conditional expression (2) is satisfied, the following conditional expression (3) is further satisfied.
It is possible to realize a zoom lens having good performance, which is suitable for a so-called digital image sensor. 0.8 <f4 / fw <4.0 (3) where, f4: focal length of the fourth lens group fw: focal length of the entire system at the wide-angle end.
【００３０】条件式（３）の下限値以下になると、第４
レンズ群のパワーが強くなりすぎ、広角端において第４
レンズ群で発生する軸外のコマ収差を補正する事ができ
なくなる。逆に、上限値以上になると、第４レンズ群の
パワーが弱くなりすぎ、特に広角端での軸外光束の主光
線が撮像面に入射するときの入射角が、９０度から離れ
てしまい、テレセントリック性が悪化するので、デジタ
ル撮像センサー使用時の、本光学系とのマッチングが悪
くなる。If the lower limit of conditional expression (3) is not reached, the fourth
The power of the lens group becomes too strong, and it becomes 4th at the wide angle end.
It becomes impossible to correct off-axis coma aberration generated in the lens group. On the other hand, when the upper limit value is exceeded, the power of the fourth lens group becomes too weak, and the incident angle when the chief ray of the off-axis light flux particularly enters the imaging surface at the wide-angle end deviates from 90 degrees, Since the telecentricity is deteriorated, the matching with the present optical system is deteriorated when the digital image sensor is used.
【００３１】また本発明では、物体側から順に、負のパ
ワーを有する第１レンズ群，正のパワーを有する第２レ
ンズ群，正のパワーを有する第３レンズ群，及び正のパ
ワーを有する第４レンズ群より成り、第１レンズ群，第
４レンズ群が固定で、第２レンズ群，第３レンズ群が、
各レンズ群間隔を変えるように光軸上を移動する事によ
り変倍を行う構成において、各レンズ群をそれぞれ１枚
のレンズで構成する事により、非常にコンパクトなズー
ムレンズを実現する事ができる。Further, in the present invention, in order from the object side, the first lens group having negative power, the second lens group having positive power, the third lens group having positive power, and the first lens group having positive power. It is composed of four lens groups, the first lens group and the fourth lens group are fixed, and the second lens group and the third lens group are
In a configuration in which zooming is performed by moving on the optical axis so as to change the distance between the lens groups, a very compact zoom lens can be realized by configuring each lens group with one lens. .
【００３２】特に、有効領域が比較的小さい撮像素子用
の光学系においては、その絶対寸法が小さいものとなる
ため、各レンズ群における光軸上の長さを短くする事
が、光学系全長の短縮に最も効果的となる。そして、各
レンズ群における光軸上の長さを短くするためには、レ
ンズの構成枚数を減らす事が最も効果的である。本発明
では、負正正正の構成において、各レンズ群をそれぞれ
１枚のレンズで構成する事で、全系の大きさを非常に小
さくする事ができる。In particular, in an optical system for an image pickup device having a relatively small effective area, the absolute size thereof is small, so shortening the length on the optical axis of each lens group is to reduce the total length of the optical system. Most effective for shortening. In order to shorten the length on the optical axis of each lens group, it is most effective to reduce the number of lenses. In the present invention, in the negative, positive, positive and positive configuration, each lens group is configured by one lens, so that the size of the entire system can be made extremely small.
【００３３】さらに本発明では、上述した、各レンズ群
をそれぞれ１枚のレンズで構成する場合に、更に上記条
件式（２）を満足する事により、更にコンパクトなズー
ムレンズを実現する事ができる。また、更に上記条件式
（１）を満足する事により、更に低コストでコンパクト
なズームレンズを実現する事ができる。ここでは条件式
（１），（２）のうち、いずれを優先させても良い。Further, according to the present invention, when each of the above-mentioned lens groups is composed of one lens, by further satisfying the conditional expression (2), a more compact zoom lens can be realized. . Further, by further satisfying the conditional expression (1), it is possible to realize a compact zoom lens at a lower cost. Here, any one of the conditional expressions (1) and (2) may be prioritized.
【００３４】また本発明では、物体側から順に、負のパ
ワーを有する第１レンズ群，正のパワーを有する第２レ
ンズ群，正のパワーを有する第３レンズ群，及び正のパ
ワーを有する第４レンズ群より成り、第１レンズ群，第
４レンズ群が固定で、第２レンズ群，第３レンズ群が、
各レンズ群間隔を変えるように光軸上を移動する事によ
り変倍を行う構成であって、第１レンズ群中に、少なく
とも１枚の負のパワーを持つプラスチックレンズを有
し、第２レンズ群或いは第３レンズ群中に、少なくとも
１枚の正のパワーを持つプラスチックレンズを備えた構
成において、以下の条件式（４）を満足する事により、
環境温度変化時のレンズバック変動を良好に補正する事
が可能な、低コストのズームレンズを実現する事ができ
る。Further, in the present invention, in order from the object side, the first lens group having negative power, the second lens group having positive power, the third lens group having positive power, and the first lens group having positive power. It is composed of four lens groups, the first lens group and the fourth lens group are fixed, and the second lens group and the third lens group are
A configuration for performing zooming by moving on the optical axis so as to change the distance between the lens groups, wherein the first lens group includes at least one plastic lens having negative power, and the second lens In the configuration in which at least one plastic lens having a positive power is provided in the lens group or the third lens group, the following conditional expression (4) is satisfied,
It is possible to realize a low-cost zoom lens that can satisfactorily correct lens back fluctuations when the environmental temperature changes.
【００３５】
νｄG1＞４０ （４）
但し、
νｄG1：第１レンズ群中の、少なくとも１枚の負のパワ
ーを持つプラスチックレンズの分散値
である。ここで、上記レンズバックは、第４レンズ群の
最終面或いはその直後のローパスフィルターの後面か
ら、像面までの距離で定義する。Νd G1 > 40 (4) where νd G1 is the dispersion value of at least one plastic lens having negative power in the first lens group. Here, the lens back is defined by the distance from the rear surface of the fourth lens group or the rear surface of the low-pass filter immediately thereafter to the image surface.
【００３６】光学系の低コスト化を図るためには、でき
るだけプラスチックレンズを使用する事が望ましい。し
かしながら、プラスチックレンズは、温湿度等の環境変
化により、特にレンズバックを大きく変動させる事があ
るので、これが撮像性能の劣化につながる。この不具合
を解消するためには、プラスチックレンズで発生するレ
ンズバック変動を打ち消すように、光学系を構成してい
る負のパワーを持つプラスチックレンズと正のパワーを
持つプラスチックレンズの、その各パワーをそれぞれ適
切な値にしてやればよい。In order to reduce the cost of the optical system, it is desirable to use plastic lenses as much as possible. However, the plastic lens may cause a large change in the lens back especially due to environmental changes such as temperature and humidity, which leads to deterioration of image pickup performance. In order to eliminate this problem, the respective powers of the plastic lens with negative power and the plastic lens with positive power that compose the optical system are adjusted so as to cancel the lens back fluctuation that occurs in the plastic lens. You can set each to an appropriate value.
【００３７】本構成において低コスト化を図るために
は、まず、第１レンズ群における負レンズをプラスチッ
クレンズとする事が望ましい。また、各レンズ群で発生
する色収差を効果的に除去するためには、その第１レン
ズ群中の負レンズは、上記条件式（４）を満足する事が
望ましい。条件式（４）の下限値以下になると、特に広
角端において倍率色収差が大きくなり、良好な性能を確
保する事ができなくなる。次に、第２レンズ群或いは第
３レンズ群中に正のプラスチックレンズを配置する事
で、環境温度変化時に第１レンズ群中の負レンズで発生
するレンズバック変動を良好に補正する事ができる。In order to reduce the cost in this structure, it is desirable that the negative lens in the first lens group be a plastic lens. Further, in order to effectively remove the chromatic aberration generated in each lens unit, it is desirable that the negative lens in the first lens unit satisfies the conditional expression (4). When the value is equal to or lower than the lower limit of conditional expression (4), lateral chromatic aberration becomes large particularly at the wide-angle end, and it becomes impossible to secure good performance. Next, by disposing a positive plastic lens in the second lens group or the third lens group, it is possible to satisfactorily correct the lens back fluctuation that occurs in the negative lens in the first lens group when the environmental temperature changes. .
【００３８】さらに本発明では、上述した、第１レンズ
群中に、少なくとも１枚の負のパワーを持つプラスチッ
クレンズを有し、第２レンズ群中に、少なくとも１枚の
正のパワーを持つプラスチックレンズを備え、条件式
（４）を満足する構成において、更に以下の条件式
（５）を満足する事により、レンズバック変動を抑えた
ズームレンズを実現する事ができる。
０．７＜｜Ｆ１／Ｆ２｜＜１．４ （５）
但し、
Ｆ１：第１レンズ群中の負のパワーを持つプラスチック
レンズの焦点距離
Ｆ２：第２レンズ群中の正のパワーを持つプラスチック
レンズの焦点距離
である。Further, in the present invention, at least one plastic lens having negative power is provided in the first lens group, and at least one plastic lens having positive power is provided in the second lens group. In a configuration including a lens and satisfying the conditional expression (4), further satisfying the following conditional expression (5) makes it possible to realize a zoom lens with suppressed lens back fluctuation. 0.7 <| F1 / F2 | <1.4 (5) However, F1: Focal length of the plastic lens having negative power in the first lens group F2: Plastic having positive power in the second lens group The focal length of the lens.
【００３９】条件式（５）の下限値以下になると、第２
レンズ群中の正のパワーを持つプラスチックレンズの、
そのパワーが相対的に弱くなり、環境温度が常温から変
化したときに、第１レンズ群中の負のパワーを持つプラ
スチックレンズで発生するレンズバック変動を打ち消す
事ができなくなる。逆に、上限値以上になると、第２レ
ンズ群中の正のパワーを持つプラスチックレンズの、そ
のパワーが相対的に強くなり、環境温度が常温から変化
したときに、第１レンズ群中の負のパワーを持つプラス
チックレンズで発生するレンズバック変動を打ち消して
更に行き過ぎる、いわゆる補正過剰の状態となってしま
う。If the lower limit of conditional expression (5) is reached, the second
Of the plastic lens with positive power in the lens group,
When the power becomes relatively weak and the ambient temperature changes from room temperature, it becomes impossible to cancel the lens back fluctuation generated in the plastic lens having negative power in the first lens group. On the other hand, when the upper limit is exceeded, the power of the plastic lens having positive power in the second lens group becomes relatively strong, and when the environmental temperature changes from room temperature, the negative power in the first lens group becomes negative. The lens back fluctuation that occurs in the plastic lens having the power of 1 is cancelled, and it goes further to the overshooting state.
【００４０】或いは本発明では、上述した、第１レンズ
群中に、少なくとも１枚の負のパワーを持つプラスチッ
クレンズを有し、第３レンズ群中に、少なくとも１枚の
正のパワーを持つプラスチックレンズを備え、条件式
（４）を満足する構成において、更に以下の条件式
（６）を満足する事により、レンズバック変動を抑えた
ズームレンズを実現する事ができる。
０．３＜｜Ｆ１／Ｆ３｜＜１．０ （６）
但し、
Ｆ１：第１レンズ群中の負のパワーを持つプラスチック
レンズの焦点距離
Ｆ３：第３レンズ群中の正のパワーを持つプラスチック
レンズの焦点距離
である。Alternatively, in the present invention, at least one plastic lens having negative power is provided in the first lens group, and at least one plastic lens having positive power is provided in the third lens group. In a configuration including a lens and satisfying the conditional expression (4), further satisfying the following conditional expression (6) makes it possible to realize a zoom lens with suppressed lens back fluctuation. 0.3 <| F1 / F3 | <1.0 (6) However, F1: Focal length of the plastic lens having negative power in the first lens group F3: Plastic having positive power in the third lens group The focal length of the lens.
【００４１】条件式（６）の下限値以下になると、第３
レンズ群中の正のパワーを持つプラスチックレンズの、
そのパワーが相対的に弱くなり、環境温度が常温から変
化したときに、第１レンズ群中の負のパワーを持つプラ
スチックレンズで発生するレンズバック変動を打ち消す
事ができなくなる。逆に、上限値以上になると、第３レ
ンズ群中の正のパワーを持つプラスチックレンズの、そ
のパワーが相対的に強くなり、環境温度が常温から変化
したときに、第１レンズ群中の負のパワーを持つプラス
チックレンズで発生するレンズバック変動を打ち消して
更に行きすぎる、いわゆる補正過剰の状態となってしま
う。If the lower limit of conditional expression (6) is reached, the third
Of the plastic lens with positive power in the lens group,
When the power becomes relatively weak and the ambient temperature changes from room temperature, it becomes impossible to cancel the lens back fluctuation generated in the plastic lens having negative power in the first lens group. On the other hand, when the upper limit is exceeded, the power of the plastic lens having positive power in the third lens group becomes relatively strong, and when the environmental temperature changes from room temperature, the negative power in the first lens group becomes negative. The lens back fluctuation that occurs in the plastic lens with the power of 5 is canceled out, and it goes into a state of overcorrection.
【００４２】なお、本発明の撮像装置の例（不図示）を
以下に述べておく。本撮像装置において、物体（被写
体）からの光は、光軸に沿ってズームレンズを通過し、
ＣＣＤ或いはＣＭＯＳセンサー等より成る撮像素子に光
学像を形成する。撮像素子は、ズームレンズによって形
成された光学像を光電変換し、電子映像信号として記録
装置等へ出力する。このような構成において、比較的小
さな有効領域を持つ撮像素子を使えば、非常にコンパク
トなデジタルカメラやデジタルビデオユニット等の撮像
装置を実現する事ができる。An example (not shown) of the image pickup apparatus of the present invention will be described below. In the present imaging device, light from an object (subject) passes through the zoom lens along the optical axis,
An optical image is formed on an image pickup device such as a CCD or CMOS sensor. The image pickup device photoelectrically converts the optical image formed by the zoom lens and outputs it as an electronic image signal to a recording device or the like. In such a configuration, if an image pickup device having a relatively small effective area is used, a very compact image pickup device such as a digital camera or a digital video unit can be realized.
【００４３】以下、本発明の撮像装置に係るズームレン
ズの光学系の構成を、コンストラクションデータ，収差
図等を挙げて、更に具体的に示す。なお、以下に挙げる
実施例１〜６は、前述した第１〜第６の実施形態にそれ
ぞれ対応しており、第１〜第６の実施形態を表すレンズ
構成図（図１〜図６）は、対応する実施例１〜６のレン
ズ構成をそれぞれ示している。Hereinafter, the configuration of the optical system of the zoom lens according to the image pickup apparatus of the present invention will be described more specifically with reference to construction data, aberration diagrams, and the like. In addition, Examples 1 to 6 listed below respectively correspond to the above-described first to sixth embodiments, and the lens configuration diagrams (FIGS. 1 to 6) representing the first to sixth embodiments are , And the corresponding lens configurations of Examples 1 to 6 are shown.
【００４４】各実施例において、ri(i=1,2,3...)は、物
体側から数えてi 番目の面及びその曲率半径を示し、di
(i=1,2,3...)は、物体側から数えてi 番目の軸上面間隔
を示し、Ni(i=1,2,3...)，νi(i=1,2,3...) は、それぞ
れ物体側から数えてi 番目のレンズのｄ線に対する屈折
率，アッベ数を示す。また、実施例中の全系の焦点距離
ｆ、並びに第１レンズ群と第２レンズ群との間隔，第２
レンズ群と第３レンズ群との間隔，及び第３レンズ群と
第４レンズ群との間隔は、左から順に、広角端（Ｗ），
中間焦点距離（Ｍ），望遠端（Ｔ）でのそれぞれの値に
対応している。なお、各実施例中、曲率半径に＊印を付
した面は、非球面で構成された面である事を示し、非球
面の面形状を表す式は、以下に定義する。In each embodiment, ri (i = 1,2,3 ...) represents the i-th surface counted from the object side and its radius of curvature, and di
(i = 1,2,3 ...) is the i-th axial top surface distance from the object side, and Ni (i = 1,2,3 ...), νi (i = 1,2, 3 ...) indicates the refractive index and Abbe number for the d-line of the i-th lens counted from the object side. Further, the focal length f of the entire system in the embodiment, the distance between the first lens group and the second lens group, the second
The distance between the lens group and the third lens group and the distance between the third lens group and the fourth lens group are, in order from the left, the wide-angle end (W),
It corresponds to each value at the intermediate focal length (M) and the telephoto end (T). In each of the examples, a surface with a radius of curvature marked with * indicates that the surface is composed of an aspherical surface, and an expression representing the surface shape of the aspherical surface is defined below.
【００４５】 Ｘ＝Ｘ0＋ΣＡiＹi ・・・・・（ａ） Ｘ0 ＝ＣＹ2／｛１＋（１−εＣ2Ｙ2）1/2｝ ・・・・・（ｂ） 但し、 Ｘ ：光軸方向の基準面からの変位量 Ｙ ：光軸と垂直な方向の高さ Ｃ ：近軸曲率 ε ：２次曲面パラメータ Ａi ：ｉ次の非球面係数 である。X = X 0 + ΣA i Y i (a) X 0 = CY 2 / {1+ (1-εC 2 Y 2 ) 1/2 } (b) where X : Amount of displacement from the reference surface in the optical axis direction Y: height in the direction perpendicular to the optical axis C: paraxial curvature ε: quadric surface parameter A i : i-th order aspherical coefficient.
【００４６】 《実施例１》 ｆ=2.3mm 〜 4.6mm 〜 6.6mm （全系焦点距離） FNO=2.2 （Ｆナンバー） [曲率半径] [軸上面間隔] [屈折率(Nd)] [アッベ数(νd)] r1*= -5.600 d1= 0.800 N1=1.52200 ν1= 52.20 r2*= 4.769 d2= 5.339 〜 2.036 〜 0.800 r3*= 2.041 d3= 2.500 N2=1.52510 ν2= 56.38 r4*= 6.127 d4= 0.999 〜 2.200 〜 0.786 r5= ∞(絞り) d5= 0.300 r6*= 4.801 d6= 1.073 N3=1.49310 ν3= 83.58 r7*=629.957 d7= 0.400 〜 2.501 〜 5.152 r8*= 2.929 d8= 0.979 N4=1.52200 ν4= 52.20 r9= 4.107 d9= 0.353 r10= ∞ d10=1.100 N5=1.51680 ν5= 64.20 r11= ∞[0046] << Example 1 >> f = 2.3mm-4.6mm-6.6mm (focal length of the whole system) FNO = 2.2 (F number) [Radius of curvature] [Spacing on top of axis] [Refractive index (Nd)] [Abbe number (νd)] r1 * = -5.600 d1 = 0.800 N1 = 1.52200 ν1 = 52.20 r2 * = 4.769 d2 = 5.339 ~ 2.036 ~ 0.800 r3 * = 2.041 d3 = 2.500 N2 = 1.52510 ν2 = 56.38 r4 * = 6.127 d4 = 0.999 ~ 2.200 ~ 0.786 r5 = ∞ (aperture) d5 = 0.300 r6 * = 4.801 d6 = 1.073 N3 = 1.49310 ν3 = 83.58 r7 * = 629.957 d7 = 0.400 ~ 2.501 ~ 5.152 r8 * = 2.929 d8 = 0.979 N4 = 1.52200 ν4 = 52.20 r9 = 4.107 d9 = 0.353 r10 = ∞ d10 = 1.100 N5 = 1.51680 ν5 = 64.20 r11 = ∞
【００４７】 [第１面(r1)の非球面係数] ε= 0.10000×10 A4= 0.24251×10-1 A6=-0.36784×10-2 A8= 0.26665×10-3 A10=-0.66188×10-5 [第２面(r2)の非球面係数] ε= 0.10000×10 A4= 0.17763×10-1 A6= 0.82011×10-3 A8=-0.12088×10-2 A10=0.13910×10-3 [第３面(r3)の非球面係数] ε= 0.10000×10 A4=-0.10671×10-1 A6= 0.33068×10-2 A8=-0.18023×10-2 A10=0.17725×10-3 [第４面(r4)の非球面係数] ε= 0.10000×10 A4= 0.19498×10-1 A6= 0.42393×10-2 A8= 0.32378×10-2 [第６面(r6)の非球面係数] ε= 0.10000×10 A4=-0.56579×10-2 A6= 0.31781×10-3 A8= 0.13318×10-2 [第７面(r7)の非球面係数] ε= 0.10000×10 A4=-0.50081×10-2 A6=-0.12132×10-1 A8= 0.18749×10-1 A10=-0.94100×10-2 [第８面(r8)の非球面係数] ε= 0.10000×10 A4=-0.21797×10-1 A6= 0.12632×10-1 A8=-0.59650×10-2 A10=0.92149×10-3 [Aspherical surface coefficient of the first surface (r1)] ε = 0.10000 × 10 A4 = 0.24251 × 10 -1 A6 = -0.36784 × 10 -2 A8 = 0.26665 × 10 -3 A10 = -0.66188 × 10 -5 [Aspherical surface coefficient of the second surface (r2)] ε = 0.10000 × 10 A4 = 0.17763 × 10 -1 A6 = 0.82011 × 10 -3 A8 = -0.12088 × 10 -2 A10 = 0.13910 × 10 -3 [Third surface Aspherical coefficient of (r3)] ε = 0.10000 × 10 A4 = -0.10671 × 10 -1 A6 = 0.33068 × 10 -2 A8 = -0.18023 × 10 -2 A10 = 0.17725 × 10 -3 [4th surface (r4) Aspherical coefficient of] ε = 0.10000 × 10 A4 = 0.19498 × 10 -1 A6 = 0.42393 × 10 -2 A8 = 0.32378 × 10 -2 [aspherical coefficient of 6th surface (r6)] ε = 0.10000 × 10 A4 = -0.56579 × 10 -2 A6 = 0.31781 × 10 -3 A8 = 0.13318 × 10 -2 [Aspherical surface of the 7th surface (r7)] ε = 0.10000 × 10 A4 = -0.50081 × 10 -2 A6 = -0.12132 × 10 -1 A8 = 0.18749 × 10 -1 A10 = -0.94 100 × 10 -2 [Aspherical surface coefficient of the 8th surface (r8)] ε = 0.10000 × 10 A4 = -0.21797 × 10 -1 A6 = 0.12632 × 10 -1 A8 = -0.59650 × 10 -2 A10 = 0.92149 × 10 -3
【００４８】 《実施例２》 ｆ=2.9mm 〜 5.9mm 〜 8.5mm （全系焦点距離） FNO=2.0 （Ｆナンバー） [曲率半径] [軸上面間隔] [屈折率(Nd)] [アッベ数(νd)] r1*= -8.336 d1= 0.800 N1=1.52200 ν1= 52.20 r2*= 6.319 d2= 7.166 〜 2.625 〜 0.800 r3*= 3.179 d3= 5.028 N2=1.52510 ν2= 56.38 r4*= 17.468 d4= 0.581 〜 2.861 〜 1.395 r5= ∞(絞り) d5= 0.300 r6*= 3.537 d6= 1.080 N3=1.48749 r7*= 7.745 d7= 0.500 〜 2.761 〜 6.052 r8*= 4.508 d8= 1.074 N4=1.52200 ν3= 52.20 r9= 9.639 d9= 0.290 r10= ∞ d10= 2.000 N5=1.51680 ν4= 64.20 r11= ∞[0048] << Example 2 >> f = 2.9mm-5.9mm-8.5mm (entire system focal length) FNO = 2.0 (F number) [Radius of curvature] [Spacing on top of axis] [Refractive index (Nd)] [Abbe number (νd)] r1 * = -8.336 d1 = 0.800 N1 = 1.52200 ν1 = 52.20 r2 * = 6.319 d2 = 7.166 ~ 2.625 ~ 0.800 r3 * = 3.179 d3 = 5.028 N2 = 1.52510 ν2 = 56.38 r4 * = 17.468 d4 = 0.581 ~ 2.861 ~ 1.395 r5 = ∞ (aperture) d5 = 0.300 r6 * = 3.537 d6 = 1.080 N3 = 1.48749 r7 * = 7.745 d7 = 0.500 ~ 2.761 ~ 6.052 r8 * = 4.508 d8 = 1.074 N4 = 1.52200 ν3 = 52.20 r9 = 9.639 d9 = 0.290 r10 = ∞ d10 = 2.000 N5 = 1.51680 ν4 = 64.20 r11 = ∞
【００４９】 [第１面(r1)の非球面係数] ε= 0.10000×10 A4= 0.91403×10-2 A6=-0.78226×10-3 A8= 0.31975×10-4 A10=-0.46201×10-6 [第２面(r2)の非球面係数] ε= 0.10000×10 A4= 0.70857×10-2 A6=-0.13716×10-3 A8=-0.80407×10-4 A10=0.53690×10-5 [第３面(r3)の非球面係数] ε= 0.10000×10 A4=-0.30660×10-2 A6=-0.47498×10-4 A8=-0.40681×10-5 A10=-0.32295×10-5 [第４面(r4)の非球面係数] ε= 0.10000×10 A4= 0.44184×10-2 A6= 0.31329×10-3 A8= 0.89156×10-4 [第６面(r6)の非球面係数] ε= 0.10000×10 A4= 0.20457×10-2 A6= 0.11966×10-2 A8= 0.15823×10-3 [第７面(r7)の非球面係数] ε= 0.10000×10 A4= 0.62192×10-2 A6=-0.32734×10-2 A8= 0.53862×10-2 A10=-0.18795×10-2 [第８面(r8)の非球面係数] ε= 0.10000×10 A4=-0.10309×10-1 A6= 0.43652×10-2 A8=-0.13624×10-2 A10=0.15140×10-3 [Aspherical surface coefficient of the first surface (r1)] ε = 0.10000 × 10 A4 = 0.91403 × 10 -2 A6 = -0.78226 × 10 -3 A8 = 0.31975 × 10 -4 A10 = -0.46201 × 10 -6 [Aspherical surface coefficient of the 2nd surface (r2)] ε = 0.10000 × 10 A4 = 0.70857 × 10 -2 A6 = -0.13716 × 10 -3 A8 = -0.80407 × 10 -4 A10 = 0.53690 × 10 -5 [Third Aspherical coefficient of surface (r3)] ε = 0.10000 × 10 A4 = -0.30660 × 10 -2 A6 = -0.47498 × 10 -4 A8 = -0.40681 × 10 -5 A10 = -0.32295 × 10 -5 [4th surface (r4) aspherical coefficient] ε = 0.10000 × 10 A4 = 0.44184 × 10 -2 A6 = 0.31329 × 10 -3 A8 = 0.89156 × 10 -4 [aspherical surface coefficient of the 6th surface (r6)] ε = 0.10000 × 10 A4 = 0.20457 × 10 -2 A6 = 0.11966 × 10 -2 A8 = 0.15823 × 10 -3 [Aspherical coefficient of the 7th surface (r7)] ε = 0.10000 × 10 A4 = 0.62192 × 10 -2 A6 = -0.32734 × 10 -2 A8 = 0.53862 × 10 -2 A10 = -0.18795 × 10 -2 [ aspherical coefficients of the eighth surface (r8)] ε = 0.10000 × 10 A4 = -0.10309 × 10 -1 A6 = 0.43652 × 10 - 2 A8 = -0.136 24 × 10 -2 A10 = 0.15140 × 10 -3
【００５０】 《実施例３》 ｆ=3.4mm 〜 6.7mm 〜 9.7mm （全系焦点距離） FNO=2.2 （Ｆナンバー） [曲率半径] [軸上面間隔] [屈折率(Nd)] [アッベ数(νd)] r1*=-10.385 d1= 0.800 N1=1.52200 ν1= 52.20 r2*= 6.827 d2= 8.680 〜 4.017 〜 1.965 r3*= 3.092 d3= 1.996 N2=1.52510 ν2= 56.38 r4= -59.917 d4= 0.620 r5*= 5.086 d5= 1.762 N3=1.84666 ν3= 23.82 r6*= 2.544 d6= 0.800 〜 3.432 〜 2.144 r7*= 5.046 d7= 1.236 N4=1.49310 ν4= 83.58 r8= 404.369 d8= 0.200 r9= ∞(絞り) d9= 0.300 〜 2.330 〜 5.671 r10*=11.282 d10=1.157 N5=1.52200 ν5= 52.20 r11=-13.524 d11=0.100 r12= ∞ d12=2.000 N6=1.51680 ν6= 64.20 r13= ∞[0050] << Example 3 >> f = 3.4mm-6.7mm-9.7mm (focal length of entire system) FNO = 2.2 (F number) [Radius of curvature] [Spacing on top of axis] [Refractive index (Nd)] [Abbe number (νd)] r1 * =-10.385 d1 = 0.800 N1 = 1.52200 ν1 = 52.20 r2 * = 6.827 d2 = 8.680 ~ 4.017 ~ 1.965 r3 * = 3.092 d3 = 1.996 N2 = 1.52510 ν2 = 56.38 r4 = -59.917 d4 = 0.620 r5 * = 5.086 d5 = 1.762 N3 = 1.84666 ν3 = 23.82 r6 * = 2.544 d6 = 0.800 ~ 3.432 ~ 2.144 r7 * = 5.046 d7 = 1.236 N4 = 1.49310 ν4 = 83.58 r8 = 404.369 d8 = 0.200 r9 = ∞ (aperture) d9 = 0.300 ~ 2.330 ~ 5.671 r10 * = 11.282 d10 = 1.157 N5 = 1.52200 ν5 = 52.20 r11 = -13.524 d11 = 0.100 r12 = ∞ d12 = 2.000 N6 = 1.51680 ν6 = 64.20 r13 = ∞
【００５１】 [第１面(r1)の非球面係数] ε= 0.10000×10 A4= 0.65197×10-3 A6= 0.15721×10-3 A8=-0.98210×10-5 A10=0.29200×10-6 [第２面(r2)の非球面係数] ε= 0.10000×10 A4=-0.13276×10-2 A6= 0.71296×10-3 A8=-0.90471×10-4 A10=0.61587×10-5 [第３面(r3)の非球面係数] ε= 0.10000×10 [第５面(r5)の非球面係数] ε= 0.10000×10 A4=-0.10134×10-1 A6= 0.39016×10-3 A8=-0.93679×10-3 A10=0.16494×10-3 [第６面(r6)の非球面係数] ε= 0.10000×10 A4=-0.10888×10-1 A6=-0.24553×10-2 A8= 0.24595×10-3 [第７面(r7)の非球面係数] ε= 0.10000×10 A4=-0.38209×10-3 A6= 0.93140×10-3 A8=-0.23036×10-3 [第１０面(r10)の非球面係数] ε= 0.10000×10 A4=-0.54647×10-2 A6=-0.61884×10-3 A8= 0.37814×10-3 A10=-0.48842×10-4 [Aspherical surface coefficient of the first surface (r1)] ε = 0.10000 × 10 A4 = 0.65197 × 10 -3 A6 = 0.15721 × 10 -3 A8 = -0.98210 × 10 -5 A10 = 0.29200 × 10 -6 [ Aspherical coefficient of the 2nd surface (r2)] ε = 0.10000 × 10 A4 = -0.13276 × 10 -2 A6 = 0.71296 × 10 -3 A8 = -0.90471 × 10 -4 A10 = 0.61587 × 10 -5 [3rd surface (r3) aspherical coefficient] ε = 0.10000 × 10 [5th surface (r5) aspherical coefficient] ε = 0.10000 × 10 A4 = -0.10134 × 10 -1 A6 = 0.39016 × 10 -3 A8 = -0.93679 × 10 -3 A10 = 0.16494 × 10 -3 [Aspherical coefficient of 6th surface (r6)] ε = 0.10000 × 10 A4 = -0.10888 × 10 -1 A6 = -0.24553 × 10 -2 A8 = 0.24595 × 10 -3 [Aspherical surface of the 7th surface (r7)] ε = 0.10000 × 10 A4 = -0.38209 × 10 -3 A6 = 0.93140 × 10 -3 A8 = -0.23036 × 10 -3 [Aspherical surface of the 10th surface (r10)] Coefficient] ε = 0.10000 × 10 A4 = -0.54647 × 10 -2 A6 = -0.61884 × 10 -3 A8 = 0.37814 × 10 -3 A10 = -0.48842 × 10 -4
【００５２】 《実施例４》 ｆ=4.0mm 〜 8.0mm 〜11.5mm （全系焦点距離） FNO=1.8 （Ｆナンバー） [曲率半径] [軸上面間隔] [屈折率(Nd)] [アッベ数(νd)] r1*=-11.801 d1= 0.900 N1=1.52200 ν1= 52.20 r2*= 8.450 d2= 9.436 〜 3.442 〜 1.285 r3= 4.502 d3= 3.699 N2=1.77250 ν2= 49.77 r4= 27.969 d4= 0.100 r5*= 3.199 d5= 0.847 N3=1.84666 ν3= 23.82 r6*= 1.978 d6= 0.630 〜 3.644 〜 2.731 r7= ∞(絞り) d7= 0.300 r8= 3.424 d8= 0.800 N4=1.84666 ν4= 23.82 r9= 2.750 d9= 0.100 r10*= 2.427 d10=1.495 N5=1.49310 ν5= 83.58 r11*=10.230 d11=0.600 〜 3.580 〜 6.651 r12*= 8.988 d12=1.120 N6=1.52200 ν6= 52.20 r13*=69.031 d13=0.100 r14= ∞ d14=2.000 N7=1.51680 ν6= 64.20 r15= ∞[0052] << Example 4 >> f = 4.0mm-8.0mm-11.5mm (focal length of the whole system) FNO = 1.8 (F number) [Radius of curvature] [Spacing on top of axis] [Refractive index (Nd)] [Abbe number (νd)] r1 * =-11.801 d1 = 0.900 N1 = 1.52200 ν1 = 52.20 r2 * = 8.450 d2 = 9.436 ~ 3.442 ~ 1.285 r3 = 4.502 d3 = 3.699 N2 = 1.77250 ν2 = 49.77 r4 = 27.969 d4 = 0.100 r5 * = 3.199 d5 = 0.847 N3 = 1.84666 ν3 = 23.82 r6 * = 1.978 d6 = 0.630 ~ 3.644 ~ 2.731 r7 = ∞ (aperture) d7 = 0.300 r8 = 3.424 d8 = 0.800 N4 = 1.84666 ν4 = 23.82 r9 = 2.750 d9 = 0.100 r10 * = 2.427 d10 = 1.495 N5 = 1.49310 ν5 = 83.58 r11 * = 10.230 d11 = 0.600 ~ 3.580 ~ 6.651 r12 * = 8.988 d12 = 1.120 N6 = 1.52200 ν6 = 52.20 r13 * = 69.031 d13 = 0.100 r14 = ∞ d14 = 2.000 N7 = 1.51680 ν6 = 64.20 r15 = ∞
【００５３】 [第１面(r1)の非球面係数] ε= 0.10000×10 A4= 0.84348×10-3 A6=-0.12082×10-4 A8=-0.13684×10-6 A10=0.11116×10-7 [第２面(r2)の非球面係数] ε= 0.10000×10 A4=-0.16441×10-3 A6= 0.84746×10-4 A8=-0.78081×10-5 A10=0.24878×10-6 [第５面(r5)の非球面係数] ε= 0.10000×10 A4=-0.12310×10-1 A6=-0.30302×10-2 A8= 0.60029×10-3 A10=-0.48830×10-4 [第６面(r6)の非球面係数] ε= 0.10000×10 A4=-0.20346×10-1 A6=-0.12163×10-1 A8= 0.42483×10-2 A10=-0.83887×10-3 [第１０面(r10)の非球面係数] ε= 0.10000×10 A4= 0.30272×10-2 A6=-0.53065×10-4 A8= 0.10265×10-2 A10=-0.20747×10-3 [第１１面(r11)の非球面係数] ε= 0.10000×10 A4= 0.77013×10-2 A6= 0.89863×10-2 A8=-0.46223×10-2 A10=0.17441×10-2 [第１２面(r12)の非球面係数] ε= 0.10000×10 A4=-0.15123×10-2 A6=-0.16406×10-2 A8= 0.16178×10-3 A10=-0.10487×10-4 [第１３面(r13)の非球面係数] ε= 0.10000×10 A4= 0.64370×10-2 A6=-0.31049×10-2 A8= 0.25959×10-3 A10=-0.99236×10-5 [Aspherical surface coefficient of the first surface (r1)] ε = 0.10000 × 10 A4 = 0.84348 × 10 -3 A6 = -0.12082 × 10 -4 A8 = -0.13684 × 10 -6 A10 = 0.11116 × 10 -7 [Aspherical surface coefficient of the second surface (r2)] ε = 0.10000 × 10 A4 = -0.16441 × 10 -3 A6 = 0.84746 × 10 -4 A8 = -0.78081 × 10 -5 A10 = 0.24878 × 10 -6 [5th Aspherical coefficient of surface (r5)] ε = 0.10000 × 10 A4 = -0.12310 × 10 -1 A6 = -0.30302 × 10 -2 A8 = 0.60029 × 10 -3 A10 = -0.48830 × 10 -4 [Sixth surface ( r6) aspherical coefficient] ε = 0.10000 × 10 A4 = -0.20346 × 10 -1 A6 = -0.12163 × 10 -1 A8 = 0.42483 × 10 -2 A10 = -0.83887 × 10 -3 [10th surface (r10) Aspherical surface coefficient] ε = 0.10000 × 10 A4 = 0.30272 × 10 -2 A6 = -0.53065 × 10 -4 A8 = 0.10265 × 10 -2 A10 = -0.20747 × 10 -3 [11th surface (r11) aspherical surface] Coefficient] ε = 0.10000 × 10 A4 = 0.77013 × 10 -2 A6 = 0.89863 × 10 -2 A8 = -0.46223 × 10 -2 A10 = 0.17441 × 10 -2 [Aspherical surface of the 12th surface (r12)] ε = 0.10000 × 10 A4 = -0.15123 × 10 -2 A6 = -0.16406 × 10 -2 A8 = 0.16178 × 10 -3 A10 = -0.10487 × 10 -4 [aspherical surface coefficient of the 13th surface (r13)] ε = 0.10000 × 10 A4 = 0.64370 × 10 -2 A6 = -0.3104 9 x 10 -2 A8 = 0.25959 x 10 -3 A10 = -0.99236 x 10 -5
【００５４】 《実施例５》 ｆ=3.3mm 〜 6.6mm 〜 9.4mm （全系焦点距離） FNO=1.8 （Ｆナンバー） [曲率半径] [軸上面間隔] [屈折率(Nd)] [アッベ数(νd)] r1*=-13.742 d1= 0.900 N1=1.52200 ν1= 52.20 r2*= 5.160 d2= 0.440 r3= 5.275 d3= 2.960 N2=1.84666 ν2= 23.82 r4= 4.422 d4= 6.743 〜 2.281 〜 0.816 r5*= 3.714 d5= 2.341 N3=1.49310 ν3= 83.58 r6*=-29.096 d6= 3.597 〜 3.950 〜 1.331 r7*= 9.403 d7= 1.119 N4=1.52510 ν4= 56.38 r8= -70.546 d8= 0.300 r9= ∞(絞り) d9= 0.585 〜 4.693 〜 8.708 r10*= 3.788 d10=1.389 N5=1.49310 ν5= 83.58 r11*= 4.819 d11=0.548 r12= ∞ d12=2.000 N6=1.51680 ν6= 64.20 r13= ∞[0054] << Example 5 >> f = 3.3mm-6.6mm-9.4mm (focal length of the whole system) FNO = 1.8 (F number) [Radius of curvature] [Spacing on top of axis] [Refractive index (Nd)] [Abbe number (νd)] r1 * =-13.742 d1 = 0.900 N1 = 1.52200 ν1 = 52.20 r2 * = 5.160 d2 = 0.440 r3 = 5.275 d3 = 2.960 N2 = 1.84666 ν2 = 23.82 r4 = 4.422 d4 = 6.743 ~ 2.281 ~ 0.816 r5 * = 3.714 d5 = 2.341 N3 = 1.49310 ν3 = 83.58 r6 * =-29.096 d6 = 3.597 ~ 3.950 ~ 1.331 r7 * = 9.403 d7 = 1.119 N4 = 1.52510 ν4 = 56.38 r8 = -70.546 d8 = 0.300 r9 = ∞ (aperture) d9 = 0.585 ~ 4.693 ~ 8.708 r10 * = 3.788 d10 = 1.389 N5 = 1.49310 ν5 = 83.58 r11 * = 4.819 d11 = 0.548 r12 = ∞ d12 = 2.000 N6 = 1.51680 ν6 = 64.20 r13 = ∞
【００５５】 [第１面(r1)の非球面係数] ε= 0.10000×10 A4= 0.86589×10-3 A6= 0.23213×10-5 A8=-0.26612×10-6 A10=0.26040×10-8 [第２面(r2)の非球面係数] ε= 0.10000×10 A4=-0.82158×10-3 A6= 0.80533×10-4 A8=-0.14183×10-5 A10=0.29020×10-7 [第５面(r5)の非球面係数] ε= 0.10000×10 A4=-0.42711×10-2 A6= 0.62605×10-3 A8=-0.74976×10-4 A10=0.49449×10-5 [第６面(r6)の非球面係数] ε= 0.10000×10 A4=-0.19492×10-2 A6= 0.15174×10-2 A8=-0.26428×10-3 A10=0.23482×10-4 [第７面(r7)の非球面係数] ε= 0.10000×10 A4=-0.98521×10-3 A6= 0.29947×10-3 A8= 0.30585×10-4 A10=-0.29517×10-4 [第１０面(r10)の非球面係数] ε= 0.10000×10 A4= 0.22282×10-2 A6=-0.21480×10-2 A8= 0.18133×10-3 A10=-0.18347×10-4 [第１１面(r11)の非球面係数] ε= 0.10000×10 A4= 0.12987×10-1 A6=-0.32118×10-2 A8=-0.13298×10-3 A10=0.22287×10-4 [Aspherical surface coefficient of the first surface (r1)] ε = 0.10000 × 10 A4 = 0.86589 × 10 -3 A6 = 0.23213 × 10 -5 A8 = -0.26612 × 10 -6 A10 = 0.26040 × 10 -8 [ Aspherical surface coefficient of the 2nd surface (r2)] ε = 0.10000 × 10 A4 = -0.82158 × 10 -3 A6 = 0.80533 × 10 -4 A8 = -0.14183 × 10 -5 A10 = 0.29020 × 10 -7 [5th surface Aspherical coefficient of (r5)] ε = 0.10000 × 10 A4 = -0.42711 × 10 -2 A6 = 0.62605 × 10 -3 A8 = -0.74976 × 10 -4 A10 = 0.49449 × 10 -5 [6th surface (r6) Aspherical coefficient] ε = 0.10000 × 10 A4 = -0.19492 × 10 -2 A6 = 0.15174 × 10 -2 A8 = -0.26428 × 10 -3 A10 = 0.23482 × 10 -4 [Aspherical surface of the 7th surface (r7)] Coefficient] ε = 0.10000 × 10 A4 = -0.98521 × 10 -3 A6 = 0.29947 × 10 -3 A8 = 0.30585 × 10 -4 A10 = -0.29517 × 10 -4 [aspherical coefficient of the 10th surface (r10)] ε = 0.10000 × 10 A4 = 0.22282 × 10 -2 A6 = -0.21480 × 10 -2 A8 = 0.18133 × 10 -3 A10 = -0.18347 × 10 -4 [11th surface (r11) aspherical surface coefficient] ε = 0.10000 × 10 A4 = 0.12987 × 10 -1 A6 = -0.32118 × 10 -2 A8 = -0.13298 × 10 -3 A10 = 0.22287 × 10 -4
【００５６】 《実施例６》 ｆ=2.3mm 〜 4.6mm 〜 6.6mm （全系焦点距離） FNO=2.1 （Ｆナンバー） [曲率半径] [軸上面間隔] [屈折率(Nd)] [アッベ数(νd)] r1*= -5.600 d1= 0.800 N1=1.52200 ν1= 52.20 r2*= 4.864 d2= 5.338 〜 2.075 〜 0.800 r3*= 2.086 d3= 2.500 N2=1.51823 ν2= 58.96 r4*= 8.877 d4= 1.370 〜 2.653 〜 0.878 r5*= 7.392 d5= 1.060 N3=1.49140 ν3= 57.82 r6*=-33.169 d6= 0.200 r7= ∞(絞り) d7= 0.200 〜 2.180 〜 5.230 r8*= 2.997 d8= 1.036 N4=1.52200 ν4= 52.20 r9= 4.987 d9= 0.329 r10= ∞ d10=1.100 N5=1.51680 ν5= 64.20 r11= ∞[0056] << Example 6 >> f = 2.3mm-4.6mm-6.6mm (focal length of the whole system) FNO = 2.1 (F number) [Radius of curvature] [Spacing on top of axis] [Refractive index (Nd)] [Abbe number (νd)] r1 * = -5.600 d1 = 0.800 N1 = 1.52200 ν1 = 52.20 r2 * = 4.864 d2 = 5.338 ~ 2.075 ~ 0.800 r3 * = 2.086 d3 = 2.500 N2 = 1.51823 ν2 = 58.96 r4 * = 8.877 d4 = 1.370 ~ 2.653 ~ 0.878 r5 * = 7.392 d5 = 1.060 N3 = 1.49140 ν3 = 57.82 r6 * =-33.169 d6 = 0.200 r7 = ∞ (aperture) d7 = 0.200 ~ 2.180 ~ 5.230 r8 * = 2.997 d8 = 1.036 N4 = 1.52200 ν4 = 52.20 r9 = 4.987 d9 = 0.329 r10 = ∞ d10 = 1.100 N5 = 1.51680 ν5 = 64.20 r11 = ∞
【００５７】 [第１面(r1)の非球面係数] ε= 0.10000×10 A4= 0.24637×10-1 A6=-0.36550×10-2 A8= 0.26478×10-3 A10=-0.67350×10-5 [第２面(r2)の非球面係数] ε= 0.10000×10 A4= 0.17821×10-1 A6= 0.95395×10-3 A8=-0.11477×10-2 A10=0.12847×10-3 [第３面(r3)の非球面係数] ε= 0.10000×10 A4=-0.10143×10-1 A6= 0.33594×10-2 A8=-0.16755×10-2 A10=0.17550×10-3 [第４面(r4)の非球面係数] ε= 0.10000×10 A4= 0.17814×10-1 A6= 0.30310×10-2 A8= 0.32227×10-2 [第５面(r5)の非球面係数] ε= 0.10000×10 A4=-0.95144×10-2 A6=-0.99416×10-3 A8= 0.45735×10-2 [第６面(r6)の非球面係数] ε= 0.10000×10 A4=-0.82109×10-2 A6=-0.13752×10-1 A8= 0.19907×10-1 A10=-0.85034×10-2 [第８面(r8)の非球面係数] ε= 0.10000×10 A4=-0.22014×10-1 A6= 0.12814×10-1 A8=-0.53036×10-2 A10=0.72902×10-3 [Aspherical surface coefficient of the first surface (r1)] ε = 0.10000 × 10 A4 = 0.24637 × 10 -1 A6 = -0.36550 × 10 -2 A8 = 0.26478 × 10 -3 A10 = -0.67350 × 10 -5 [Aspherical coefficient of the 2nd surface (r2)] ε = 0.10000 × 10 A4 = 0.17821 × 10 -1 A6 = 0.95395 × 10 -3 A8 = -0.11477 × 10 -2 A10 = 0.12847 × 10 -3 [3rd surface Aspherical coefficient of (r3)] ε = 0.10000 × 10 A4 = -0.10143 × 10 -1 A6 = 0.33594 × 10 -2 A8 = -0.16755 × 10 -2 A10 = 0.17550 × 10 -3 [4th surface (r4) Aspherical coefficient of ε = 0.10000 × 10 A4 = 0.17814 × 10 -1 A6 = 0.30310 × 10 -2 A8 = 0.32227 × 10 -2 [aspherical coefficient of the 5th surface (r5)] ε = 0.10000 × 10 A4 = -0.95144 × 10 -2 A6 = -0.99416 × 10 -3 A8 = 0.45735 × 10 -2 [Aspherical coefficient of the 6th surface (r6)] ε = 0.10000 × 10 A4 = -0.82109 × 10 -2 A6 = -0.13752 × 10 -1 A8 = 0.19907 × 10 -1 A10 = -0.85034 × 10 -2 [ aspherical coefficients of the eighth surface (r8)] ε = 0.10000 × 10 A4 = -0.22014 × 10 -1 A6 = 0.12814 × 10 - 1 A8 = -0.53036 × 10 -2 A10 = 0.72902 × 10 -3
【００５８】また、図７〜図１２は、それぞれ前記実施
例１〜６に対応する無限遠の収差図であり、各図におい
て、上段は広角端〔Ｗ〕、中段は中間焦点距離〔Ｍ〕、
下段は望遠端〔Ｔ〕をそれぞれ表している。そして、球
面収差図において、実線（ｄ）はｄ線を表し、一点鎖線
（ｇ）はｇ線を表し、破線（ＳＣ）は正弦条件を表して
いる。また、非点収差図において、実線（ＤＳ）と破線
（ＤＭ）は、それぞれサジタル面とメリディオナル面で
の非点収差を表している。また以下に、各実施例１〜６
における、上記条件式（１）〜（６）に対応する値を示
す。FIGS. 7 to 12 are infinity aberration diagrams corresponding to Examples 1 to 6, respectively. In each figure, the upper stage is the wide-angle end [W] and the middle stage is the intermediate focal length [M]. ,
The lower row shows the telephoto end [T]. In the spherical aberration diagram, the solid line (d) represents the d line, the alternate long and short dash line (g) represents the g line, and the broken line (SC) represents the sine condition. In the astigmatism diagram, the solid line (DS) and the broken line (DM) represent astigmatism on the sagittal surface and the meridional surface, respectively. In addition, in each of Examples 1 to 6
In, the values corresponding to the conditional expressions (1) to (6) are shown.
【００５９】 f2／ft t4／y′ f4／fw νdG1 |F1／F2| |F1／F3| 実施例１ 0.73 0.75 6.62 52.2 1.00 − 実施例２ 0.78 0.59 5.13 52.2 1.02 − 実施例３ 0.66 0.64 3.56 52.2 1.37 − 実施例４ 0.76 0.50 4.92 52.2 − − 実施例５ 0.72 0.62 7.57 52.2 − − 実施例６ 0.71 0.79 5.31 52.2 − 0.39F2 / ft t4 / y ′ f4 / fw νd G1 | F1 / F2 | | F1 / F3 | Example 1 0.73 0.75 6.62 52.2 1.00-Example 2 0.78 0.59 5.13 52.2 1.02-Example 3 0.66 0.64 3.56 52.2 1.37 − Example 4 0.76 0.50 4.92 52.2 − − Example 5 0.72 0.62 7.57 52.2 − − Example 6 0.71 0.79 5.31 52.2 − 0.39
【００６０】[0060]
【発明の効果】以上説明したように、本発明によれば、
低コストでしかもコンパクトであり、さらにはＦナンバ
ーが小さくてズーム比が大きいズームレンズを備えた撮
像装置を提供する事ができる。As described above, according to the present invention,
It is possible to provide an image pickup apparatus including a zoom lens that is low in cost and compact, and has a small F number and a large zoom ratio.
【００６１】また、このようなズームレンズにより、比
較的小さな有効領域を持つ撮像素子を使って、非常にコ
ンパクトなデジタルカメラやデジタルビデオユニット等
の撮像装置を実現する事ができる。With such a zoom lens, a very compact image pickup device such as a digital camera or a digital video unit can be realized by using an image pickup device having a relatively small effective area.
【図１】第１の実施形態のズームレンズの光学系の構成
を示す図。FIG. 1 is a diagram showing a configuration of an optical system of a zoom lens according to a first embodiment.
【図２】第２の実施形態のズームレンズの光学系の構成
を示す図。FIG. 2 is a diagram showing a configuration of an optical system of a zoom lens according to a second embodiment.
【図３】第３の実施形態のズームレンズの光学系の構成
を示す図。FIG. 3 is a diagram showing a configuration of an optical system of a zoom lens according to a third embodiment.
【図４】第４の実施形態のズームレンズの光学系の構成
を示す図。FIG. 4 is a diagram showing a configuration of an optical system of a zoom lens according to a fourth embodiment.
【図５】第５の実施形態のズームレンズの光学系の構成
を示す図。FIG. 5 is a diagram showing a configuration of an optical system of a zoom lens according to a fifth embodiment.
【図６】第６の実施形態のズームレンズの光学系の構成
を示す図。FIG. 6 is a diagram showing a configuration of an optical system of a zoom lens according to a sixth embodiment.
【図７】実施例１に対応する無限遠の収差図。FIG. 7 is an aberration diagram for infinity corresponding to Example 1.
【図８】実施例２に対応する無限遠の収差図。FIG. 8 is an aberration diagram for infinity corresponding to Example 2.
【図９】実施例３に対応する無限遠の収差図。FIG. 9 is an aberration diagram for infinity corresponding to Example 3.
【図１０】実施例４に対応する無限遠の収差図。FIG. 10 is an aberration diagram for infinity corresponding to Example 4.
【図１１】実施例５に対応する無限遠の収差図。FIG. 11 is an aberration diagram for infinity corresponding to Example 5.
【図１２】実施例６に対応する無限遠の収差図。FIG. 12 is an aberration diagram for infinity corresponding to Example 6.
Ｇ１ 第１レンズ群 Ｇ２ 第２レンズ群 Ｇ３ 第３レンズ群 Ｇ４ 第４レンズ群 Ｌ１〜Ｌ６ レンズ ＬＰＦ ローパスフィルター Ｘ 光軸 Ｓ 絞り G1 first lens group G2 Second lens group G3 Third lens group G4 4th lens group L1 to L6 lenses LPF low pass filter X optical axis S aperture
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) G02B 9/00 - 17/08 G02B 21/02 - 21/04 G02B 25/00 - 25/04 ─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. 7 , DB name) G02B 9/00-17/08 G02B 21/02-21/04 G02B 25/00-25/04
Claims (7)
ームレンズ系と、該ズームレンズ系によって形成された
前記光学像を電子映像信号に変換する撮像素子と、を備
えた撮像装置であって、 前記ズームレンズ系は、物体側から順に、負のパワーを
有する第１レンズ群，正のパワーを有する第２レンズ
群，正のパワーを有する第３レンズ群，及び正のパワー
を有する第４レンズ群より成り、第１レンズ群，第４レ
ンズ群が固定で、第２レンズ群，第３レンズ群が、各レ
ンズ群間隔を変えるように光軸上を移動する事により変
倍を行う撮像装置において、第２レンズ群、或いは第３レンズ群に絞りを備え、前記
第４レンズ群は１枚の正レンズより成るとともに、 以下の条件式を満足する事を特徴とする撮像装置； ０．３＜ｆ２／ｆｔ＜１．４０．４＜ｔ４／ｙ′＜１．５ ０．８＜ｆ４／ｆｗ＜４．０ 但し、 ｆ２：第２レンズ群の焦点距離 ｆｔ：望遠端における全系の焦点距離ｔ４：第４レンズ群のレンズ芯厚 ｙ′：対角像高 ｆ４：第４レンズ群の焦点距離 ｆｗ：広角端における全系の焦点距離 である。1. An image pickup apparatus comprising: a zoom lens system that forms light from an object as an optical image; and an image pickup device that converts the optical image formed by the zoom lens system into an electronic image signal. The zoom lens system includes, in order from the object side, a first lens group having negative power, a second lens group having positive power, a third lens group having positive power, and a fourth lens group having positive power. Imaging that consists of lens groups, the first lens group and the fourth lens group are fixed, and the second lens group and the third lens group move on the optical axis so as to change the distance between the lens groups, thereby performing zooming. In the apparatus, the second lens group or the third lens group is provided with an aperture,
The fourth lens unit is composed of one positive lens and satisfies the following conditional expression: 0.3 <f2 / ft <1.4 0.4 <t4 / y '<1 .5 0.8 <f4 / fw <4.0 where, f2: focal length of the second lens group ft: focal point of the entire system at the telephoto end distance t4: lens core thickness y of the fourth lens group ': diagonal image High f4: Focal length of the fourth lens group fw: Focal length of the entire system at the wide-angle end.
成り、該負レンズの像側の面は負のパワーを持つ非球面
である事を特徴とする請求項１に記載の撮像装置。2. The image pickup apparatus according to claim 1, wherein the first lens group includes one negative lens, and an image side surface of the negative lens is an aspherical surface having negative power. .
より成る事を特徴とする請求項１に記載の撮像装置。3. The image pickup apparatus according to claim 1, wherein each of the lens groups includes one lens.
の負のパワーを持つプラスチックレンズを有し、前記第
２レンズ群中に、少なくとも１枚の正のパワーを持つプ
ラスチックレンズを備え、以下の条件式を満足する事を
特徴とする請求項１に記載の撮像装置； νｄG1＞４０ 但し、 νｄG1：第１レンズ群中の、少なくとも１枚の負のパワ
ーを持つプラスチックレンズの分散値 である。4. The first lens group includes at least one negative power plastic lens, and the second lens group includes at least one positive power plastic lens, The imaging device according to claim 1, wherein the following conditional expression is satisfied: νd G1 > 40, where νd G1 : dispersion of at least one plastic lens having negative power in the first lens group. It is a value.
請求項４に記載の撮像装置； ０．７＜｜Ｆ１／Ｆ２｜＜１．４ 但し、 Ｆ１：第１レンズ群中の負のパワーを持つプラスチック
レンズの焦点距離 Ｆ２：第２レンズ群中の正のパワーを持つプラスチック
レンズの焦点距離 である。5. The following conditional expression is satisfied:
The image pickup apparatus according to claim 4 , 0.7 <| F1 / F2 | <1.4, where F1: focal length of a plastic lens having negative power in the first lens group F2: in the second lens group It is the focal length of a plastic lens with positive power.
の負のパワーを持つプラスチックレンズを有し、前記第
３レンズ群中に、少なくとも１枚の正のパワーを持つプ
ラスチックレンズを備え、以下の条件式を満足する事を
特徴とする請求項１に記載の撮像装置； νｄG1＞４０ 但し、 νｄG1：第１レンズ群中の、少なくとも１枚の負のパワ
ーを持つプラスチックレンズの分散値 である。6. The first lens group includes at least one plastic lens having negative power, and the third lens group includes at least one plastic lens having positive power. The imaging device according to claim 1, wherein the following conditional expression is satisfied: νd G1 > 40, where νd G1 : dispersion of at least one plastic lens having negative power in the first lens group. It is a value.
請求項６に記載の撮像装置； ０．３＜｜Ｆ１／Ｆ３｜＜１．０ 但し、 Ｆ１：第１レンズ群中の負のパワーを持つプラスチック
レンズの焦点距離 Ｆ３：第３レンズ群中の正のパワーを持つプラスチック
レンズの焦点距離である。7. The following conditional expression is satisfied:
The image pickup apparatus according to claim 6 , 0.3 <| F1 / F3 | <1.0, where F1: focal length of a plastic lens having negative power in the first lens group F3: in the third lens group It is the focal length of a plastic lens with positive power.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2000265716A JP3493406B2 (en) | 2000-09-01 | 2000-09-01 | Imaging device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000265716A JP3493406B2 (en) | 2000-09-01 | 2000-09-01 | Imaging device |
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| Publication Number | Publication Date |
|---|---|
| JP2002072095A JP2002072095A (en) | 2002-03-12 |
| JP3493406B2 true JP3493406B2 (en) | 2004-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000265716A Expired - Fee Related JP3493406B2 (en) | 2000-09-01 | 2000-09-01 | Imaging device |
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| Country | Link |
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| JP (1) | JP3493406B2 (en) |
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