JPH10213742A - Photographic lens system - Google Patents
Photographic lens systemInfo
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- JPH10213742A JPH10213742A JP9016649A JP1664997A JPH10213742A JP H10213742 A JPH10213742 A JP H10213742A JP 9016649 A JP9016649 A JP 9016649A JP 1664997 A JP1664997 A JP 1664997A JP H10213742 A JPH10213742 A JP H10213742A
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- lens
- lens group
- refractive power
- lens system
- group
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Abstract
Description
【０００１】[0001]
【技術分野】本発明は、主に電子スチルカメラ等に用い
られる撮影レンズ系に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographic lens system mainly used in electronic still cameras and the like.
【０００２】[0002]
【従来技術及びその問題点】近年、従来の銀塩フィルム
を使用するカメラと比較して、容易に撮影、鑑賞が可能
な電子スチルカメラが普及しつつある。また一般家庭に
普及が進んできたパーソナルコンピュータ等で簡単に静
止画像を入力する装置としても小型で高解像の電子スチ
ルカメラが望まれている。2. Description of the Related Art In recent years, electronic still cameras, which can easily photograph and appreciate images, have become more popular than conventional cameras using silver halide films. Also, a small and high-resolution electronic still camera is desired as a device for easily inputting a still image using a personal computer or the like that has been widely used in general households.
【０００３】このような目的で利用される電子スチルカ
メラは、高い性能だけでなく、小型化と低コスト化の要
求が非常に高い。さらに、電子スチルカメラなどのよう
に小型の撮像素子を用いるカメラでは、素子の小型化に
伴い１画素の大きさが小さくなり、非常に高解像度の撮
影光学系が必要とされる。さらに、レンズ系と撮像素子
との間に、フィルター等を配置するスペースが必要なた
め、十分長いバックフォーカスも要求される。また、カ
ラー撮像素子を用いる光学系は、色ムラ防止のために撮
像素子にレンズから射出した光が垂直に入射する、いわ
ゆるテレセントリック性が良好であることが要求され
る。The electronic still camera used for such a purpose is required to have not only high performance but also miniaturization and low cost. Further, in a camera such as an electronic still camera using a small image pickup device, the size of one pixel becomes smaller as the size of the device becomes smaller, and a very high resolution photographing optical system is required. Further, since a space for disposing a filter or the like is required between the lens system and the image sensor, a sufficiently long back focus is also required. In addition, an optical system using a color image sensor is required to have good so-called telecentricity, in which light emitted from a lens is vertically incident on the image sensor to prevent color unevenness.
【０００４】この種の撮影レンズ系で５枚構成の光学系
としては、特開平２−８５８１６号公報や特開平３−６
３６１３号公報などが知られているが、前者は大口径で
あるが半画角２０°以下で画角が狭く、後者は半画角２
７°前後まで広角化されているが歪曲収差が大きく改善
の余地がある。また、これらの光学系は、動画を対象と
している場合が多く、電子スチルカメラ等で利用するに
は、解像度が低く改善の余地がある。[0004] Japanese Patent Application Laid-Open Nos. 2-85816 and 3-6 describe an optical system having a five-lens structure of this kind of taking lens system.
No. 3613 is known, the former has a large aperture, but has a narrow angle of view at a half angle of view of 20 ° or less, and the latter has a half angle of view of 2 °.
Although the angle of view is widened to about 7 °, distortion is large and there is room for improvement. In addition, these optical systems are often intended for moving images, and have low resolution and room for improvement for use in electronic still cameras and the like.
【０００５】[0005]
【発明の目的】本発明は、十分なバックフォーカスと高
解像度に対応可能な光学性能を有し、テレセントリック
性が良好で、コンパクトで構成枚数の少ない広角の撮影
レンズ系を提供することを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide a compact, wide-angle photographic lens system having sufficient back focus and optical performance capable of coping with high resolution, good telecentricity, and a small number of components. I do.
【０００６】[0006]
【発明の概要】本発明の撮影レンズ系は、物体側より順
に、負の屈折力（パワー）を有する第１レンズからなる
第１レンズ群と；正の屈折力を有する第２レンズと、負
の屈折力を有する第３レンズと、正の屈折力を有する第
４レンズの３群３枚のレンズからなる第２レンズ群と；
正の第５レンズからなる第３レンズ群と；からなる全体
として５枚構成のレンズ系であって、下記の条件式
（１）、（２）及び（３）を満足することを特徴とす
る。 （１）１．２＜Ｆ2 ／Ｆ＜２．０ （２）１．１＜｜Ｆ1 ／Ｆ2 ｜＜１．７ （３）０．８＜Ｆ3 ／Ｆ2 ＜１．４ 但し、 Ｆ：レンズ全系の焦点距離、 Ｆ1 ：第１レンズ群の焦点距離、 Ｆ2 ：第２レンズ群の焦点距離、 Ｆ3 ：第３レンズ群の焦点距離、 である。SUMMARY OF THE INVENTION A photographic lens system according to the present invention comprises, in order from the object side, a first lens group consisting of a first lens having a negative refractive power; a second lens having a positive refractive power; A second lens group consisting of three lenses including a third lens having a refractive power of 3 and a fourth lens having a positive refractive power;
And a third lens group consisting of a positive fifth lens; a five-lens system as a whole, characterized by satisfying the following conditional expressions (1), (2) and (3). . (1) 1.2 <F 2 /F<2.0 (2) 1.1 <| F 1 / F 2 | <1.7 (3) 0.8 <F 3 / F 2 <1.4 where , F: focal length of the entire lens system, F 1 : focal length of the first lens group, F 2 : focal length of the second lens group, F 3 : focal length of the third lens group.
【０００７】本発明の撮影レンズ系において、より具体
的には、第２レンズ群の第２レンズを物体側に凸面を有
する正レンズから構成し、第４レンズを像側に凸面を有
する正レンズから構成し、さらに下記条件式（４）及び
（又は）（５）を満足させることが好ましい。 （４）２．５＜｜（ｆ2 ＋ｆ4 ）／ｆ3 ｜＜３．７ （５）１．２＜｜ｒ3 ／ｒ8 ｜＜１．７ 但し、 ｆi ：物体側より第ｉ番目のレンズの焦点距離、 ｒi ：物体側より第ｉ番目の面の曲率半径、 である。More specifically, in the taking lens system according to the present invention, the second lens of the second lens group is composed of a positive lens having a convex surface on the object side, and the fourth lens is a positive lens having a convex surface on the image side. It is preferable to further satisfy the following conditional expressions (4) and (or) (5). (4) 2.5 <| (f 2 + f 4 ) / f 3 | <3.7 (5) 1.2 <| r 3 / r 8 | <1.7 where f i : i-th from the object side The focal length of the i- th lens, r i : the radius of curvature of the i-th surface from the object side.
【０００８】また、本発明の撮影レンズ系において、よ
り具体的には、第１レンズ群を構成する第１レンズを像
側に凹面を有するメニスカスレンズから構成し、第３レ
ンズ群を構成する第５レンズを物体側に凸面を有する正
レンズから構成し、さらに下記条件式（６）及び（又
は）（７）を満足させることが望ましい。 （６）０．２５＜｜ｄ2 ／Ｆ1 ｜＜０．５ （７）０．５＜ｒ9 ／Ｆ3 ＜１．０ 但し、ｄ2 ：第１レンズと第２レンズの空気間隔、 である。In the photographic lens system according to the present invention, more specifically, the first lens constituting the first lens group is constituted by a meniscus lens having a concave surface on the image side, and the third lens group constituting the third lens group. It is desirable that the five lenses be composed of a positive lens having a convex surface on the object side, and further satisfy the following conditional expressions (6) and (or) (7). (6) 0.25 <| d 2 / F 1 | <0.5 (7) 0.5 <r 9 / F 3 <1.0 where d 2 is the air gap between the first lens and the second lens; It is.
【０００９】[0009]
【発明の実施の形態】本発明の撮影レンズ系は、十分な
バックフォーカスを確保するとともに、広角化を図るた
め、最も物体側に負の屈折力（パワー）を有する第１レ
ンズ群を配置し、続いて３群３枚構成からなる第２レン
ズ群を配置し、さらに良好なテレセントリック性を得る
ため、最も像側には正の屈折力（パワー）を有する第３
レンズ群を配置する。このとき、第２レンズ群の屈折力
と、第２レンズ群に対する、第１レンズ群及び第３レン
ズ群の屈折力を適切に配分することにより、良好な性能
と十分長いバックフォーカスとテレセントリック性が得
られる。また構成レンズ枚数を少なくするため、第１レ
ンズ群と第３レンズ群は、それぞれ単レンズから構成し
ている。DESCRIPTION OF THE PREFERRED EMBODIMENTS In a taking lens system according to the present invention, a first lens unit having a negative refractive power (power) is arranged closest to an object side in order to secure a sufficient back focus and widen the angle. Then, a second lens group having a three-group, three-element configuration is arranged, and in order to obtain more favorable telecentricity, the third lens having a positive refractive power (power) closest to the image side.
Arrange the lens groups. At this time, by appropriately distributing the refractive power of the second lens group and the refractive power of the first lens group and the third lens group with respect to the second lens group, good performance, sufficiently long back focus and telecentricity can be obtained. can get. In order to reduce the number of constituent lenses, the first lens group and the third lens group are each formed of a single lens.
【００１０】条件式（１）は、第２レンズ群の焦点距離
とレンズ全系の焦点距離の比に関する条件である。条件
式（１）の下限を越えて、レンズ全系の屈折力に対する
第２レンズ群の屈折力が強くなると、第２レンズ群内の
各レンズの屈折力が増大し、球面収差、コマ収差を小さ
く抑えることが困難となり、画面全体のコントラストの
低下を伴う。条件式（１）の上限を越えて、第２レンズ
群の屈折力が弱くなると、像面湾曲が補正不足となると
ともに、非点隔差が大きくなる。Conditional expression (1) is a condition relating to the ratio between the focal length of the second lens group and the focal length of the entire lens system. When the lower limit of conditional expression (1) is exceeded and the refractive power of the second lens group becomes stronger with respect to the refractive power of the entire lens system, the refractive power of each lens in the second lens group increases, and spherical aberration and coma are reduced. It is difficult to keep the size small, and the contrast of the entire screen is reduced. If the refractive power of the second lens group is weakened beyond the upper limit of conditional expression (1), the field curvature will be insufficiently corrected and the astigmatic difference will increase.
【００１１】条件式（２）は、第１レンズ群の焦点距離
と第２レンズ群の焦点距離の比に関するものである。条
件式（２）の下限を越えると、第２レンズ群に対する第
１レンズ群の負の屈折力が強くなり、強い負の歪曲収差
が発生するとともに、球面収差及びコマフレアーを良好
に補正することが困難となる条件式（２）の上限を越え
ると、第１レンズ群の負の屈折力が弱くなり、十分なバ
ックフォーカスを確保することが困難になるとともに、
像面湾曲が補正不足となり広角化も難しくなる。Conditional expression (2) relates to the ratio of the focal length of the first lens unit to the focal length of the second lens unit. When the lower limit of conditional expression (2) is exceeded, the negative refracting power of the first lens group with respect to the second lens group becomes strong, and strong negative distortion occurs, and spherical aberration and coma flare are corrected well. If the upper limit of conditional expression (2) is exceeded, the negative refractive power of the first lens unit becomes weak, and it becomes difficult to secure a sufficient back focus.
The field curvature is insufficiently corrected, and it is difficult to widen the angle.
【００１２】条件式（３）は、第３レンズ群の焦点距離
と第２レンズ群の焦点距離の比に関するものである。条
件式（３）の下限を越えると、第２レンズ群に対する第
３レンズ群の屈折力が強くなりすぎ、テレセントリック
性は良好になるが、負の歪曲収差が大きくなるととも
に、像面湾曲、非点収差を良好に補正することも困難に
なる。またペッツバール和が増大し、良好な像面性能を
得ることが困難になるとともに、バックフォーカスを長
くすることが困難になる。条件式（３）の上限を越える
と、第３レンズ群の正の屈折力が弱くなり、それととも
にテレセントリック性を維持するために、第２レンズ群
の像側の正レンズの屈折力が増大し、特に周辺部におけ
るコマフレアーの発生を小さくすることが困難になる。Conditional expression (3) relates to the ratio of the focal length of the third lens unit to the focal length of the second lens unit. If the lower limit of conditional expression (3) is exceeded, the refracting power of the third lens group with respect to the second lens group will be too strong, and the telecentricity will be good. It also becomes difficult to satisfactorily correct astigmatism. In addition, the Petzval sum increases, making it difficult to obtain good image surface performance and making it difficult to lengthen the back focus. If the upper limit of conditional expression (3) is exceeded, the positive refractive power of the third lens group becomes weak, and the refractive power of the image-side positive lens of the second lens group increases in order to maintain telecentricity. In particular, it becomes difficult to reduce the occurrence of coma flare particularly in the peripheral portion.
【００１３】条件式（４）は、第２レンズ群を構成する
正レンズと負レンズの屈折力配分に関する条件である。
条件式（４）の下限を越えると、第２レンズ群内の正レ
ンズの屈折力が強くなりすぎ、逆に負レンズの屈折力の
減少によりペッツバール和が大きくなり、像面湾曲を良
好に補正することが困難になる。条件式（４）の上限を
越えると、第２レンズ群内の負レンズの屈折力が増大
し、球面収差、コマ収差を小さく抑えることが困難にな
る。Conditional expression (4) is a condition relating to the refractive power distribution of the positive lens and the negative lens constituting the second lens group.
If the lower limit of conditional expression (4) is exceeded, the refractive power of the positive lens in the second lens group becomes too strong, and the Petzval sum increases due to the decrease in the refractive power of the negative lens. It becomes difficult to do. If the upper limit of conditional expression (4) is exceeded, the refractive power of the negative lens in the second lens group will increase, making it difficult to reduce spherical aberration and coma.
【００１４】条件式（５）は、第２レンズ群の最も物体
側の面（第２レンズの物体側の面）の曲率半径と最も像
側の面（第４レンズの像側の面）の曲率半径の比に関す
る条件である。条件式（５）の下限を越えると、最も物
体側の面の曲率半径が小さくなり、特にコマ収差が悪化
して、コントラスト低下の原因となる。条件式（５）の
上限を越えると、最も像側の面の曲率半径が小さくな
り、特に像面湾曲、非点収差を良好に補正することが困
難になる。The conditional expression (5) represents the radius of curvature of the most object side surface of the second lens group (the object side surface of the second lens) and the radius of curvature of the most image side surface (the image side surface of the fourth lens). This is a condition regarding the ratio of the curvature radii. If the lower limit of conditional expression (5) is exceeded, the radius of curvature of the surface closest to the object will be small, and in particular, coma will worsen, causing a decrease in contrast. If the upper limit of conditional expression (5) is exceeded, the radius of curvature of the surface closest to the image will be small, and it will be difficult to satisfactorily correct particularly the curvature of field and astigmatism.
【００１５】条件式（６）は、第１レンズ群と第２レン
ズ群の空気間隔（第１レンズと第２レンズ）の空気間隔
と、第１レンズ群の焦点距離の比に関する条件である。
条件式（６）の下限を越えると、十分長いバックフォー
カスを確保することが困難となる。条件式（６）の上限
を越えると、バックフォーカスは十分確保することがで
きるが、諸収差の補正、特に球面収差、コマ収差の補正
が困難になる。The conditional expression (6) is a condition relating to the ratio of the air distance between the first lens group and the second lens group (the first lens and the second lens) to the focal length of the first lens group.
If the lower limit of conditional expression (6) is exceeded, it will be difficult to ensure a sufficiently long back focus. If the upper limit of conditional expression (6) is exceeded, a sufficient back focus can be ensured, but it becomes difficult to correct various aberrations, especially spherical aberration and coma.
【００１６】条件式（７）は、第３レンズ群（正の第５
レンズ）の物体側の面の曲率半径と第３レンズ群（第５
レンズ）の焦点距離に関する条件である。条件式（７）
の範囲内で、正の第５レンズの物体側の曲率半径を決め
ることにより、諸収差を悪化させることなく、良好なテ
レセントリック性を確保することが可能になる。Conditional expression (7) is satisfied by the third lens unit (positive fifth lens unit).
Radius of curvature of the object-side surface of the third lens group (the fifth lens).
Lens). Conditional expression (7)
By determining the radius of curvature of the positive fifth lens on the object side within the range, it is possible to ensure good telecentricity without deteriorating various aberrations.
【００１７】以下、具体的な数値実施例について、本発
明を説明する。以下の実施例１ないし５は、各レンズ構
成図に示すように、いずれも、物体側から順に、像側に
強い凹面を有するメニスカス負レンズ１ｎからなる第１
レンズ群１０、物体側に強い凸面を有する正レンズ２
ｐ、両凹面の負レンズ３ｎ及び像側に強い凸面を有する
正レンズ４ｐから構成される第２レンズ群２０、物体側
に強い凸面を有する正レンズ５ｐからなる第３レンズ群
３０、及び撮像素子のカバーガラスである平行平面ガラ
スＧを基本構成としている。絞りＳは、第２レンズ群２
０中の第２レンズ２ｐと第３レンズ３ｎの間に配置され
ている。平行平面ガラスＧは、例えば、水晶フィルタ、
赤外線カットフィルタ、カバーガラスからなり、その像
側の面が撮像面である。Hereinafter, the present invention will be described with reference to specific numerical examples. In the following Examples 1 to 5, as shown in each lens configuration diagram, in each case, in order from the object side, a first meniscus negative lens 1n having a strong concave surface on the image side is used.
Lens group 10, positive lens 2 having a strong convex surface on the object side
p, a second lens group 20 including a biconcave negative lens 3n and a positive lens 4p having a strong convex surface on the image side, a third lens group 30 including a positive lens 5p having a strong convex surface on the object side, and an image sensor The basic configuration is a parallel flat glass G that is a cover glass. The aperture S is the second lens group 2
It is arranged between the second lens 2p and the third lens 3n in the middle. The parallel plane glass G is, for example, a quartz filter,
It is composed of an infrared cut filter and a cover glass, and the surface on the image side is an imaging surface.
【００１８】諸収差図中、ｄ線、ｇ線、Ｃ線は、球面収
差、色収差、倍率色収差の波長を示す。非点収差図にお
けるＳはサジタル像面、Ｍはメリディオナル像面を示し
ている。表および図面中、FNO はＦナンバー、F はレン
ズ全系の焦点距離、W は半画角、fBはバックフォーカス
を表す。Ｒは曲率半径、Ｄはレンズ厚またはレンズ間
隔、Ｎd はｄ線の屈折率、νd はアッベ数を示す。バッ
クフォーカスfBは、第３レンズ群の最終面（ｒ１０面）
から平行平面ガラスＧの像側面（ｒ１２）迄の空気換算
距離（fB=d10+(d11/N11)）である。In the various aberration diagrams, d-line, g-line, and C-line indicate wavelengths of spherical aberration, chromatic aberration, and chromatic aberration of magnification. In the astigmatism diagram, S indicates a sagittal image plane, and M indicates a meridional image plane. In the tables and drawings, F NO represents the F number, F represents the focal length of the entire lens system, W represents the half angle of view, and f B represents the back focus. R is the radius of curvature, D is the lens thickness or lens interval, N d is the refractive index of the d-line, and ν d is the Abbe number. Back focus f B is the final surface of the third lens group (r10 surface)
Is an air-equivalent distance (f B = d 10 + (d 11 / N 11 )) from the image plane to the image side surface (r12) of the parallel flat glass G.
【００１９】［実施例１］図１は本発明の撮影レンズ系
の第１の実施例のレンズ構成図、図２はその諸収差図、
表１はその数値データである。[Embodiment 1] FIG. 1 is a diagram showing a lens configuration of a first embodiment of a photographic lens system according to the present invention, FIG.
Table 1 shows the numerical data.
【００２０】[0020]
【表１】 FNO=1:2.4 F=10.00 W=24.9° fB=7.31(=3.35+6.00/1.51633) 面 No. R D Nd νd 1 18.665 1.54 1.48749 70.2 2 7.576 7.84 - - 3 12.763 2.98 1.83481 42.7 4 -34.671 2.88 - - 絞り ∞ 1.65 - - 5 -10.141 1.54 1.84666 23.8 6 14.844 0.48 - - 7 347.744 4.02 1.77250 49.6 8 -8.571 0.19 - - 9 10.865 3.56 1.72916 54.7 10 65.407 3.35 - - 11 ∞ 6.00 1.51633 64.1 12 ∞ - - - [Table 1] F NO = 1: 2.4 F = 10.00 W = 24.9 ° f B = 7.31 (= 3.35 + 6.00 / 1.51633) Surface No.RDN d ν d 1 18.665 1.54 1.48749 70.2 2 7.576 7.84--3 12.763 2.98 1.83481 42.7 4 -34.671 2.88--Aperture ∞ 1.65--5 -10.141 1.54 1.84666 23.8 6 14.844 0.48--7 347.744 4.02 1.77250 49.6 8 -8.571 0.19--9 10.865 3.56 1.72916 54.7 10 65.407 3.35--11 ∞ 6.00 1.51633 64.1 12 ∞---
【００２１】［実施例２］図３は本発明の撮影レンズ系
の第２の実施例のレンズ構成図、図４はその諸収差図、
表２はその数値データである。[Embodiment 2] FIG. 3 is a diagram showing the lens arrangement of a second embodiment of the taking lens system according to the present invention, FIG.
Table 2 shows the numerical data.
【００２２】[0022]
【表２】 FNO=1:2.4 F=10.00 W=24.9° fB=7.36(=3.40+6.00/1.51633) 面 No. R D Nd νd 1 19.966 1.54 1.48749 70.2 2 6.660 6.89 - - 3 13.978 3.08 1.83481 42.7 4 -24.005 2.88 - - 絞り ∞ 1.99 - - 5 -13.467 1.54 1.84666 23.8 6 13.250 0.66 - - 7 104.334 3.68 1.69680 55.5 8 -8.915 0.19 - - 9 11.219 3.62 1.69680 55.5 10 156.743 3.40 - - 11 ∞ 6.00 1.51633 64.1 12 ∞ - - - [Table 2] F NO = 1: 2.4 F = 10.00 W = 24.9 ° f B = 7.36 (= 3.40 + 6.00 / 1.51633) Surface No.RDN d ν d 1 19.966 1.54 1.48749 70.2 2 6.660 6.89--3 13.978 3.08 1.83481 42.7 4 -24.005 2.88--Aperture ∞ 1.99--5 -13.467 1.54 1.84666 23.8 6 13.250 0.66--7 104.334 3.68 1.69680 55.5 8 -8.915 0.19--9 11.219 3.62 1.69680 55.5 10 156.743 3.40--11 ∞ 6.00 1.51633 64.1 12 ∞---
【００２３】［実施例３］図５は本発明の撮影レンズ系
の第３の実施例のレンズ構成図、図６はその諸収差図、
表３はその数値データである。[Embodiment 3] FIG. 5 is a diagram showing a lens configuration of a third embodiment of the taking lens system according to the present invention, FIG.
Table 3 shows the numerical data.
【００２４】[0024]
【表３】 FNO=1:2.4 F=10.00 W=24.9° fB=6.90(=2.94+6.00/1.51633) 面 No. R D Nd νd 1 26.319 1.54 1.48749 70.2 2 6.764 3.85 - - 3 11.445 3.08 1.83481 42.7 4 -31.689 2.88 - - 絞り ∞ 1.62 - - 5 -13.247 1.54 1.84666 23.8 6 14.149 0.53 - - 7 417.716 3.59 1.78650 50.0 8 -8.473 0.19 - - 9 10.207 3.49 1.69680 55.5 10 44.947 2.94 - - 11 ∞ 6.00 1.51633 64.1 12 ∞ - - - [Table 3] F NO = 1: 2.4 F = 10.00 W = 24.9 ° f B = 6.90 (= 2.94 + 6.00 / 1.51633) Surface No.RDN d ν d 1 26.319 1.54 1.48749 70.2 2 6.764 3.85--3 11.445 3.08 1.83481 42.7 4 -31.689 2.88--Aperture ∞ 1.62--5 -13.247 1.54 1.84666 23.8 6 14.149 0.53--7 417.716 3.59 1.78650 50.0 8 -8.473 0.19--9 10.207 3.49 1.69680 55.5 10 44.947 2.94--11 ∞ 6.00 1.51633 64.1 12 ∞---
【００２５】［実施例４］図７は本発明の撮影レンズ系
の第４の実施例のレンズ構成図、図８はその諸収差図、
表４はその数値データである。[Embodiment 4] FIG. 7 is a diagram showing a lens configuration of a fourth embodiment of the taking lens system according to the present invention, FIG.
Table 4 shows the numerical data.
【００２６】[0026]
【表４】 FNO=1:2.4 F=10.00 W=24.8° fB=8.99(=5.03+6.00/1.51633) 面 No. R D Nd νd 1 24.222 1.54 1.51633 64.1 2 7.762 8.82 - - 3 13.712 2.88 1.83481 42.7 4 -30.155 2.88 - - 絞り ∞ 2.09 - - 5 -9.012 1.54 1.84666 23.8 6 16.914 0.47 - - 7 199.301 3.69 1.72916 54.7 8 -8.883 0.19 - - 9 15.353 3.59 1.75500 52.3 10 -50.790 5.03 - - 11 ∞ 6.00 1.51633 64.1 12 ∞ - - - [Table 4] F NO = 1: 2.4 F = 10.00 W = 24.8 ° f B = 8.99 (= 5.03 + 6.00 / 1.51633) Surface No.RDN d ν d 1 24.222 1.54 1.51633 64.1 2 7.762 8.82--3 13.712 2.88 1.83481 42.7 4 -30.155 2.88--Aperture ∞ 2.09--5 -9.012 1.54 1.84666 23.8 6 16.914 0.47--7 199.301 3.69 1.72916 54.7 8 -8.883 0.19--9 15.353 3.59 1.75500 52.3 10 -50.790 5.03--11 ∞ 6.00 1.51633 64.1 12 ∞---
【００２７】［実施例５］図９は本発明の撮影レンズ系
の第５の実施例のレンズ構成図、図１０はその諸収差
図、表５はその数値データである。[Embodiment 5] FIG. 9 is a lens configuration diagram of a fifth embodiment of the taking lens system according to the present invention, FIG. 10 is a diagram showing various aberrations, and Table 5 is numerical data thereof.
【００２８】[0028]
【表５】 FNO=1:2.4 F=10.00 W=24.9° fB=7.53(=3.64+5.90/1.51633) 面 No. R D Nd νd 1 14.718 1.15 1.69680 55.5 2 7.265 7.69 - - 3 11.858 3.08 1.81600 46.6 4 -29.324 2.88 - - 絞り ∞ 1.82 - - 5 -9.763 1.54 1.84666 23.8 6 14.218 0.48 - - 7 127.286 3.56 1.77250 49.6 8 -9.105 0.19 - - 9 11.565 3.49 1.77250 49.6 10 119.558 3.64 - - 11 ∞ 5.90 1.51633 64.1 12 ∞ - - - [Table 5] F NO = 1: 2.4 F = 10.00 W = 24.9 ° f B = 7.53 (= 3.64 + 5.90 / 1.51633) Surface No.RDN d ν d 1 14.718 1.15 1.69680 55.5 2 7.265 7.69--3 11.858 3.08 1.81600 46.6 4 -29.324 2.88--Aperture ∞ 1.82--5 -9.763 1.54 1.84666 23.8 6 14.218 0.48--7 127.286 3.56 1.77250 49.6 8 -9.105 0.19--9 11.565 3.49 1.77250 49.6 10 119.558 3.64--11 ∞ 5.90 1.51633 64.1 12 ∞---
【００２９】次に、実施例１ないし５の各条件式に対す
る値を表６に示す。Next, Table 6 shows values for the respective conditional expressions in Examples 1 to 5.
【表６】 実施例１ 実施例２ 実施例３ 実施例４ 実施例５ 条件式(1) 1.766 1.609 1.418 1.903 1.658 条件式(2) 1.552 1.324 1.352 1.201 1.326 条件式(3) 0.985 1.067 1.284 0.840 0.986 条件式(4) 3.234 2.984 2.667 3.460 3.288 条件式(5) 1.489 1.568 1.351 1.544 1.302 条件式(6) 0.286 0.323 0.461 0.386 0.350 条件式(7) 0.625 0.654 0.561 0.960 0.708 Table 6 Example 1 Example 2 Example 3 Example 4 Example 5 Conditional expression (1) 1.766 1.609 1.418 1.903 1.658 Conditional expression (2) 1.552 1.324 1.352 1.201 1.326 Conditional expression (3) 0.985 1.067 1.284 0.840 0.986 Condition Equation (4) 3.234 2.984 2.667 3.460 3.288 Condition (5) 1.489 1.568 1.351 1.544 1.302 Condition (6) 0.286 0.323 0.461 0.386 0.350 Condition (7) 0.625 0.654 0.561 0.960 0.708
【００３０】表６から明らかなように、実施例１ないし
５の数値は、条件式（１）ないし（７）を満足してい
る。また、収差図から明らかなように、各収差も良好に
補正され、特に特開平３−６３６１３号公報記載の撮影
レンズに比べ歪曲収差が小さい。As is clear from Table 6, the numerical values of Examples 1 to 5 satisfy the conditional expressions (1) to (7). Further, as is clear from the aberration diagrams, each aberration is well corrected, and the distortion is particularly small as compared with the taking lens described in JP-A-3-63613.
【００３１】[0031]
【発明の効果】本発明によれば、十分なバックフォーカ
スと高解像度に対応可能な光学性能を有し、テレセント
リック性が良好で、コンパクトで構成枚数の少ない広角
の撮影レンズ系を得ることができる。According to the present invention, it is possible to obtain a compact wide-angle photographing lens system having sufficient back focus and optical performance capable of coping with high resolution, having good telecentricity, and having a small number of components. .
【図１】本発明による撮影レンズ系の第１の実施例のレ
ンズ構成図である。FIG. 1 is a lens configuration diagram of a first embodiment of a taking lens system according to the present invention.
【図２】図１の撮影レンズ系の諸収差図である。FIG. 2 is a diagram illustrating various aberrations of the imaging lens system illustrated in FIG. 1;
【図３】本発明による撮影レンズ系の第２の実施例のレ
ンズ構成図である。FIG. 3 is a lens configuration diagram of a second embodiment of the taking lens system according to the present invention.
【図４】図３の撮影レンズ系の諸収差図である。FIG. 4 is a diagram illustrating various aberrations of the photographing lens system in FIG. 3;
【図５】本発明による撮影レンズ系の第３の実施例のレ
ンズ構成図である。FIG. 5 is a lens configuration diagram of a third embodiment of the taking lens system according to the present invention.
【図６】図５の撮影レンズ系の諸収差図である。6 is a diagram illustrating various aberrations of the imaging lens system in FIG. 5;
【図７】本発明による撮影レンズ系の第４の実施例のレ
ンズ構成図である。FIG. 7 is a lens configuration diagram of a fourth embodiment of the taking lens system according to the present invention.
【図８】図７の撮影レンズ系の諸収差図である。8 is a diagram illustrating various aberrations of the imaging lens system illustrated in FIG. 7;
【図９】本発明による撮影レンズ系の第５の実施例のレ
ンズ構成図である。FIG. 9 is a lens configuration diagram of a fifth embodiment of the taking lens system according to the present invention.
【図１０】図９の撮影レンズ系の諸収差図である。FIG. 10 is a diagram illustrating various aberrations of the imaging lens system in FIG. 9;
１０ 第１レンズ群 ２０ 第２レンズ群 ３０ 第３レンズ群 Ｓ 絞り Ｇ 平行平面ガラス Reference Signs List 10 first lens group 20 second lens group 30 third lens group S stop G parallel flat glass
Claims (3)
１レンズからなる第１レンズ群と；正の屈折力を有する
第２レンズと、負の屈折力を有する第３レンズと、正の
屈折力を有する第４レンズの３群３枚のレンズからなる
第２レンズ群と；正の第５レンズからなる第３レンズ群
と；からなる全体として５枚構成のレンズ系であって、 下記の条件式（１）、（２）及び（３）を満足する撮影
レンズ系。 （１）１．２＜Ｆ2 ／Ｆ＜２．０ （２）１．１＜｜Ｆ1 ／Ｆ2 ｜＜１．７ （３）０．８＜Ｆ3 ／Ｆ2 ＜１．４ 但し、 Ｆ：レンズ全系の焦点距離、 Ｆ1 ：第１レンズ群の焦点距離、 Ｆ2 ：第２レンズ群の焦点距離、 Ｆ3 ：第３レンズ群の焦点距離。1. A first lens group including a first lens having a negative refractive power, a second lens having a positive refractive power, a third lens having a negative refractive power, and a positive lens, in order from the object side. A second lens group consisting of three lenses and three lenses of a fourth lens having a refractive power of; and a third lens group consisting of a positive fifth lens; A photographic lens system satisfying the following conditional expressions (1), (2) and (3). (1) 1.2 <F 2 /F<2.0 (2) 1.1 <| F 1 / F 2 | <1.7 (3) 0.8 <F 3 / F 2 <1.4 where , F: the focal length of the entire lens system, F 1: focal length of the first lens group, F 2: focal length of the second lens group, F 3: the focal length of the third lens group.
第２レンズ群の第２レンズは、物体側に凸面を有する正
レンズからなり、第４レンズは、像側に凸面を有する正
レンズからなり、 さらに下記条件式（４）及び（５）を満足する撮影レン
ズ系。 （４）２．５＜｜（ｆ2 ＋ｆ4 ）／ｆ3 ｜＜３．７ （５）１．２＜｜ｒ3 ／ｒ8 ｜＜１．７ 但し、 ｆi ：物体側より第ｉ番目のレンズの焦点距離、 ｒi ：物体側より第ｉ番目の面の曲率半径。2. The photographing lens system according to claim 1, wherein
The second lens of the second lens group is composed of a positive lens having a convex surface on the object side, the fourth lens is composed of a positive lens having a convex surface on the image side, and further satisfies the following conditional expressions (4) and (5). Shooting lens system. (4) 2.5 <| (f 2 + f 4 ) / f 3 | <3.7 (5) 1.2 <| r 3 / r 8 | <1.7 where f i : i-th from the object side The focal length of the i- th lens, r i : the radius of curvature of the i-th surface from the object side.
おいて、第１レンズ群を構成する第１レンズは、像側に
凹面を有するメニスカスレンズからなり、第３レンズ群
を構成する第５レンズは、物体側に凸面を有する正レン
ズからなり、 さらに下記条件式（６）及び（７）を満足する撮影レン
ズ系。 （６）０．２５＜｜ｄ2 ／Ｆ1 ｜＜０．５ （７）０．５＜ｒ9 ／Ｆ3 ＜１．０ 但し、 ｄ2 ：第１レンズと第２レンズの空気間隔。3. The photographic lens system according to claim 1, wherein the first lens forming the first lens group is a meniscus lens having a concave surface on the image side, and the fifth lens forming the third lens group. Is a photographic lens system comprising a positive lens having a convex surface on the object side, and further satisfying the following conditional expressions (6) and (7). (6) 0.25 <| d 2 / F 1 | <0.5 (7) 0.5 <r 9 / F 3 <1.0 where, d 2: air gap between the first lens and the second lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01664997A JP3723654B2 (en) | 1997-01-30 | 1997-01-30 | Shooting lens system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01664997A JP3723654B2 (en) | 1997-01-30 | 1997-01-30 | Shooting lens system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10213742A true JPH10213742A (en) | 1998-08-11 |
| JP3723654B2 JP3723654B2 (en) | 2005-12-07 |
Family
ID=11922207
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP01664997A Expired - Fee Related JP3723654B2 (en) | 1997-01-30 | 1997-01-30 | Shooting lens system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3723654B2 (en) |
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