JPH06130291A - Standard lens - Google Patents
Standard lensInfo
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- JPH06130291A JPH06130291A JP30624392A JP30624392A JPH06130291A JP H06130291 A JPH06130291 A JP H06130291A JP 30624392 A JP30624392 A JP 30624392A JP 30624392 A JP30624392 A JP 30624392A JP H06130291 A JPH06130291 A JP H06130291A
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、無限遠から近距離物体
まで性能の良好な標準レンズを提供することにある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to provide a standard lens having good performance from infinity to a short distance object.
【０００２】[0002]
【従来の技術】従来の標準系の単焦点レンズは、比較的
大口径であるが無限遠物点を基準にした又は低倍率を基
準にして設計したものと、口径比に関してはあまり重き
をおかずに比較的倍率が高い有限物点を基準として設計
のものとに大別される。2. Description of the Related Art Conventional standard single-focus lenses have a relatively large aperture, but they are designed with reference to an object point at infinity or with a low magnification. It is roughly classified into those designed based on a finite object point with a relatively high magnification.
【０００３】前者のレンズ系は、明るさに重点をおくた
めに光学性能においては十分とは云えないものが多い。
また後者のレンズ系に属するマクロレンズと称されてい
るレンズ系は、変形ガラスタイプのレンズ系で、このタ
イプの対称性の利点を生かして、近距離物点にフォーカ
シングした時の収差変動を抑えるフローティング方式を
採用して光学性能の向上がはかられている。このような
レンズ系の従来例としては、特開昭６０−１００１５号
公報や特開昭６２−１９５６１７号公報が知られてい
る。また、フローティング機構の簡素化を考慮した従来
例として特開平１−２１４８１２号公報のレンズ系が知
られている。Many of the former lens systems cannot be said to have sufficient optical performance because they emphasize brightness.
The lens system called macro lens belonging to the latter lens system is a deformed glass type lens system, and it takes advantage of the symmetry of this type to suppress aberration fluctuation when focusing on a short-distance object point. The floating system is adopted to improve the optical performance. Known examples of such a lens system are disclosed in Japanese Patent Laid-Open Nos. 60-10015 and 62-195617. Further, as a conventional example in consideration of simplification of a floating mechanism, a lens system disclosed in Japanese Patent Laid-Open No. 1-214812 is known.
【０００４】[0004]
【発明が解決しようとする課題】従来のいわゆる標準レ
ンズは、有限物点特に高撮影倍率時に性能が劣化する欠
点を有していた。一方マクロレンズと云われるレンズ系
は、口径比が小であり又無限遠物点から近距離物点まで
の収差変動は抑えられているがサジタル像面とメリディ
オナル像面の隔差や倍率の色収差は残留していた。又対
称型レンズの一つの欠点であるバックフォーカスの確保
が困難であり又、最終レンズの形状によってはミラー禁
止域を得ることが出来ない等の問題がある。The conventional so-called standard lens has a drawback that its performance deteriorates at a finite object point, especially at a high photographing magnification. On the other hand, a lens system called a macro lens has a small aperture ratio and suppresses aberration variation from an object point at infinity to an object point at a short distance, but the difference between the sagittal image surface and the meridional image surface and the chromatic aberration of magnification are It remained. Further, there is a problem that it is difficult to secure the back focus, which is one of the drawbacks of the symmetrical lens, and the mirror prohibited area cannot be obtained depending on the shape of the final lens.
【０００５】本発明は無限遠から近距離物点まで安定し
た性能を有しバックフォーカスを十分確保すると共に最
終レンズをミラー禁止域を確保するのに都合のよい形状
とした標準レンズを提供することを目的とするものであ
る。The present invention provides a standard lens which has a stable performance from infinity to a short distance object point, has a sufficient back focus, and has a convenient shape for the final lens to have a mirror prohibited area. It is intended.
【０００６】[0006]
【課題を解決するための手段】本発明のレンズ系は、例
えば物体側から順に、正の屈折力の第１レンズ群Ｇ
1と、正の屈折力の第２レンズ群Ｇ2と負の屈折力の第３
レンズ群Ｇ3よりなる。そして第１レンズ群は像側に強
い曲率を有する凹面を向けた負のレンズ成分と正のレン
ズ成分とからなり正の屈折力の前群と、物体側に強い曲
率の凸面を向けた正のレンズ成分と負のレンズ成分とか
らなる後群とからなっている。又第２レンズ群は、物体
側に強い曲率を有する凹面を向けた負のレンズ成分と少
なくとも一つの正のレンズ成分とからなる。更に第３レ
ンズ群は、像側に強い曲率を有する負のレンズ成分と、
像側に凸面を向けた正のレンズ成分とからなっている。
又このレンズ系は、フォーカシング時に、全系を物体側
に相対移動させると共に第１レンズ群と第２レンズ群の
間隔および第２レンズ群と第３レンズ群の間隔のうちの
少なくとも一つを変化させるようにしたものである。The lens system of the present invention comprises, for example, a first lens group G having a positive refractive power in order from the object side.
1 , the second lens group G 2 having a positive refractive power and the third lens group G 2 having a negative refractive power
It consists of a lens group G 3 . The first lens group consists of a negative lens component having a concave surface having a strong curvature on the image side and a positive lens component, and a front group having a positive refractive power, and a positive lens having a convex surface having a strong curvature on the object side. It consists of a rear group consisting of a lens component and a negative lens component. The second lens group includes a negative lens component having a concave surface having a strong curvature on the object side and at least one positive lens component. Furthermore, the third lens group includes a negative lens component having a strong curvature on the image side,
It consists of a positive lens component with the convex surface facing the image side.
In addition, during focusing, this lens system moves at least one of the distance between the first lens group and the second lens group and the distance between the second lens group and the third lens group while moving the entire system relative to the object side. It was made to let.
【０００７】本発明のレンズ系は、主レンズ系を構成す
る第１レンズ群と第２レンズ群によって変形ガウスタイ
プを採用して、大口径化し得るようにした。即ち全体の
構成を例えば図１に示すようにした。又第１レンズ群を
前群と後群との二つの群にて構成した。本発明では、サ
ジタル像面の補正と主レンズ系に入射する軸外光束の入
射角を小にして収差補正を容易にするために第１レンズ
群中に負のレンズ成分を配置した。また第１レンズ群の
後群には空気レンズを配置してコマ収差等を良好に補正
するようにした。この場合、画角が狭く口径比もあまり
大にせず、又歪曲収差もある程度の補正にとどめればこ
の後群は通常用いられる接合レンズでもよい。また遠距
離物点から近距離物点までの結像性能が安定しているこ
とは、マクロレンズに限らず重要である。そのために本
発明では、フォーカシング時における光学系の配置と光
学系中の光線の通過状況の変化による収差変動が適切に
抑え得るような構成にしてある。In the lens system of the present invention, a modified Gauss type is adopted by the first lens group and the second lens group constituting the main lens system so that the diameter can be increased. That is, the overall structure is as shown in FIG. 1, for example. The first lens group is composed of two groups, a front group and a rear group. In the present invention, a negative lens component is arranged in the first lens group in order to correct the sagittal image plane and make the incident angle of the off-axis light beam incident on the main lens system small to facilitate aberration correction. Further, an air lens is arranged in the rear group of the first lens group so as to satisfactorily correct coma and the like. In this case, if the angle of view is narrow, the aperture ratio is not so large, and the distortion is corrected to some extent, the rear lens group may be a cemented lens which is normally used. Further, it is important that the imaging performance from a long-distance object point to a short-distance object point is stable, not limited to the macro lens. Therefore, in the present invention, the aberration variation due to the arrangement of the optical system at the time of focusing and the change of the passing condition of the light rays in the optical system can be appropriately suppressed.
【０００８】又最終レンズ群である第３レンズ群は、像
面の平坦性を維持するためのものであるがバックフォー
カスを確保するためには、物体側に強い曲率の凹面を向
ける形状や、主平面位置が物体側に深く位置するレンズ
構成は一眼レフレックスカメラ用レンズ系としては好ま
しくない。The third lens group, which is the final lens group, is for maintaining the flatness of the image surface, but in order to secure the back focus, a shape in which a concave surface having a strong curvature is directed to the object side, A lens configuration in which the principal plane position is deeply located on the object side is not preferable for a lens system for a single lens reflex camera.
【０００９】又正の屈折力の第１レンズ群は、正屈折力
の前群中で物体側に負レンズを配置すれば全体としての
屈折力を小さくし得る。また、その結果として、負屈折
力の後群の屈折力も共に小さくなる。従って前群および
後群相互で発生する収差量を抑え得る。The first lens group having a positive refracting power can reduce the refracting power as a whole by disposing a negative lens on the object side in the front group having a positive refracting power. Further, as a result, the refractive power of the rear group of negative refractive power also becomes small. Therefore, the amount of aberration generated between the front group and the rear group can be suppressed.
【００１０】次に正の屈折力の第２レンズ群は、本発明
においては、比較的に大きい屈折力を有し、従って通常
は、負レンズと少なくとも２枚の正レンズを配置するこ
とにより第１レンズ群で発生する残留収差を打ち消す作
用を負担している。The second lens group having a positive refractive power has a relatively large refractive power in the present invention. Therefore, normally, the second lens group has a negative lens and at least two positive lenses. It bears the effect of canceling the residual aberration generated in one lens group.
【００１１】また負屈折力を有する第３レンズ群は、拡
大倍率を有する為に、主レンズ系の屈折力を大きくする
結果となりレンズ系全長を短くする役割を有している。Further, since the third lens group having a negative refracting power has a magnifying power, it results in increasing the refracting power of the main lens system and has a role of shortening the overall length of the lens system.
【００１２】以上の点を考慮して、本発明では前記のよ
うな構成とした。In consideration of the above points, the present invention is configured as described above.
【００１３】前述のように第１レンズ群の前群は、物体
側に負のレンズ成分を配置しこれに続いて空気レンズを
隔てて正のレンズ成分を配置してある。これによりこの
空気レンズの面で発生する諸収差が符号が逆になり互い
に打ち消し、球面収差をはじめ、コマ収差、歪曲収差な
どの低次収差から高次収差まで良好に補正されるように
している。また第１レンズ群の負の屈折力の後群は、通
常は物体側に凸面を向けた正のメニスカスレンズあるい
は両凸レンズで構成され、空気レンズを隔てて物体側に
強い曲率の面を向けた負のメニスカスレンズもしくは両
凹レンズで構成される。ここの空気レンズの面では、特
にコマ収差、非点収差、歪曲収差などの軸外収差の高次
の収差の発生量が大になり、両面で相互に打ち消し合う
ようになる。As described above, in the front group of the first lens group, the negative lens component is arranged on the object side, and subsequently, the positive lens component is arranged across the air lens. As a result, the various aberrations generated on the surface of this air lens have opposite signs and cancel each other out, and spherical aberration, coma aberration, distortion aberration, and other low-order aberrations to high-order aberrations are well corrected. . The rear group of the negative refractive power of the first lens group is usually composed of a positive meniscus lens or a biconvex lens having a convex surface directed toward the object side, and a surface having a strong curvature is directed toward the object side across the air lens. It is composed of a negative meniscus lens or a biconcave lens. On the surface of the air lens, particularly, the amount of higher-order aberrations such as coma, astigmatism, and distortion that are off-axis aberrations becomes large, and the two surfaces cancel each other.
【００１４】次に第２レンズ群は、物体側に強い凹面を
向けた負のレンズ成分と、正のレンズ成分とで構成され
ている。このレンズ群は、正のレンズ成分と負のレンズ
成分とを空気レンズを隔てて配置したダブレットを構成
し、両空気レンズ面が球面収差、コマ収差、非点収差な
どの収差発生面となり、高次収差の発生量は特にコマ収
差が顕著であり、相互に微妙な収差補正をする作用を担
っている。Next, the second lens group is composed of a negative lens component having a strong concave surface facing the object side and a positive lens component. This lens group constitutes a doublet in which a positive lens component and a negative lens component are separated by an air lens, and both air lens surfaces serve as aberration generating surfaces such as spherical aberration, coma aberration, and astigmatism. The amount of secondary aberration generated is particularly remarkable for coma and plays a role of mutually delicate aberration correction.
【００１５】又負の屈折力の第３レンズ群は、第１レン
ズ群と第２レンズ群で発生しかつ残存する収差を補正す
るために像側に強い曲率を有する負のレンズ成分と像側
に凸面を向けた正のレンズ成分とで構成し、両レンズ成
分を空気レンズによって隔てて配置してある。The third lens unit having a negative refracting power has a negative lens component having a strong curvature on the image side and an image side in order to correct aberrations generated and remaining in the first lens unit and the second lens unit. And a positive lens component having a convex surface facing toward, and both lens components are separated by an air lens.
【００１６】この第３レンズ群は、収差補正作用の点か
らみると、３次の収差は、主レンズ群である第１レンズ
群，第２レンズ群での補正過剰の球面収差、コマ収差と
補正不足の非点収差を補正等像面の平坦性を得る役割を
有している。また高次の収差に関しては、第１レンズ
群、第２レンズ群での残留収差を全体のバランスをとる
ように打ち消す作用を有している。In terms of the aberration correction function, the third lens group has the third-order aberrations such as overcorrected spherical aberration and coma in the first lens group and the second lens group, which are main lens groups. It has a role of obtaining flatness of the image plane such as correction of astigmatism that is insufficiently corrected. With respect to higher-order aberrations, it has a function of canceling residual aberrations in the first lens group and the second lens group so as to balance them as a whole.
【００１７】以上のような構成の本発明のレンズ系にお
いて、近距離物体へのフォーカシング時に主として球面
収差、非点収差の補正を行なうために、前述のように第
１レンズ群と第２レンズ群の間隔あるいは第２レンズ群
と第３レンズ群との間隔を可変としながら、無限遠位置
を基準としてレンズ系全体を物体側へ移動させる。In the lens system of the present invention having the above-mentioned structure, in order to mainly correct spherical aberration and astigmatism at the time of focusing on a short-distance object, as described above, the first lens group and the second lens group are used. And the distance between the second lens group and the third lens group is made variable, the entire lens system is moved to the object side with the infinity position as a reference.
【００１８】例えば、後に示す実施例１のレンズ系で、
第１レンズ群と第２レンズ群との間隔および第２レンズ
群と第３レンズ群との間隔を＋０．０１mm変化させた時
の球面収差および非点収差の変化量を図１３，図１４に
示してある。この図からわかるように第１レンズ群と第
２レンズ群の間を広げると球面収差は正の方向に緩やか
に変動し又非点収差は負の方向に変動する。一方第２レ
ンズ群と第３レンズ群の間隔を広げると球面収差は正方
向に非点収差は負の方向に変動する。For example, in the lens system of Example 1 described later,
13 and 14 show changes in spherical aberration and astigmatism when the distance between the first lens group and the second lens group and the distance between the second lens group and the third lens group are changed by +0.01 mm. It is shown. As can be seen from this figure, when the distance between the first lens group and the second lens group is widened, spherical aberration fluctuates gently in the positive direction and astigmatism fluctuates in the negative direction. On the other hand, if the distance between the second lens group and the third lens group is increased, the spherical aberration fluctuates in the positive direction and the astigmatism fluctuates in the negative direction.
【００１９】従来のガウスタイプの標準レンズで、全系
を移動させてフォーカシングを行なうと、一般に光束通
過状況の変化および無限遠付近での設計倍率に起因する
収差変動で近距離物点では球面収差ならびに非点収差が
ともに補正不足になる。これが性能劣化の原因であり、
上記のようなレンズ群の間隔の一方もしくは両方をフォ
ーカシング時に変化させることによって収差変動を抑え
ることが出来る。When focusing is performed by moving the entire system with a conventional standard Gauss type lens, the spherical aberration at a short distance object point is generally caused by a change in the light flux passing condition and an aberration variation caused by the design magnification near infinity. In addition, astigmatism is insufficiently corrected. This is the cause of performance deterioration,
Aberration variation can be suppressed by changing one or both of the lens group intervals as described above during focusing.
【００２０】以上のようなフォーカシング時のレンズ群
の間隔の変化に加えて、微妙な調整を行なうために第１
レンズ群の前群と後群の間隔を変化させることが有効で
ある。In addition to the change in the distance between the lens groups during focusing as described above, the first
It is effective to change the distance between the front and rear lens groups.
【００２１】更に本発明のレンズ系において第２レンズ
群中の各レンズ成分の間の少なくとも一つの間隔を変化
させることによっても補助的な補正効果が得られる。Further, in the lens system of the present invention, an auxiliary correction effect can be obtained by changing at least one interval between the respective lens components in the second lens group.
【００２２】次に、レンズ系の各レンズ群の屈折力を適
切にして収差補正を容易にするために、下記の条件
（１），（２），（３）を満足することが望ましい。 （１） ０．０１＜ｆ2 ／ｆ1 ＜０．３ （２） ０．４＜ｆ2 ／ｆ＜１．２ （３） １．０＜β3 ＜１．５ ただしｆは全系の焦点距離、ｆ1，ｆ2は夫々第１，第２
レンズ群の焦点距離、β3は第３レンズ群の倍率であ
る。Next, it is desirable to satisfy the following conditions (1), (2) and (3) in order to make the refracting power of each lens group of the lens system appropriate and facilitate aberration correction. (1) 0.01 <f 2 / f 1 <0.3 (2) 0.4 <f 2 /f<1.2 (3) 1.0 <β 3 <1.5 where f is the whole system The focal lengths f 1 and f 2 are the first and the second, respectively.
The focal length of the lens unit, β 3 is the magnification of the third lens unit.
【００２３】条件（１）は、第１レンズ群と第２レンズ
群の屈折力を規定したものである。条件（１）の下限を
越えると第１レンズ群の前群中に負のレンズ成分を配置
した関係で、第１レンズ群全体の屈折力が小になるため
負のレンズ成分の作用が強くなり、全体の収差補正のた
めには好ましくない。或いは、条件（１）の下限を越え
ると第２レンズ群の屈折力が著しく大になりなり、同様
に収差補正上好ましくない。逆に条件（１）の上限を越
えると、第１レンズ群の屈折力が強くなるため、前群中
の負のレンズ成分の作用が相対的に弱くなり周辺まで安
定した結像性能が得られず好ましくない。The condition (1) defines the refractive powers of the first lens group and the second lens group. When the value goes below the lower limit of the condition (1), the refractive power of the entire first lens group becomes small because the negative lens component is arranged in the front group of the first lens group, so that the action of the negative lens component becomes strong. However, it is not preferable for the overall aberration correction. Alternatively, when the value goes below the lower limit of the condition (1), the refracting power of the second lens group becomes remarkably large, which is also unfavorable for aberration correction. On the other hand, when the value exceeds the upper limit of the condition (1), the refractive power of the first lens group becomes strong, so that the action of the negative lens component in the front lens group becomes relatively weak and stable imaging performance can be obtained up to the periphery. Not desirable.
【００２４】条件（２）は第２レンズ群の屈折力を規定
するものである。この条件の下限を越えると第２レンズ
群の屈折力が大になりかつこれにともなって第３レンズ
群の屈折力が大になり、このレンズ群の収差発生量が増
大し特に非点隔差が大になりレンズ系の良好な性能が得
られなくなる。また条件（２）の下限を越えると条件
（１）の下限をも越えることになることもあり得る。条
件（２）の上限を越えると第２レンズ群の屈折力が小に
なりかつ第３レンズ群が正の屈折力を持つようになる。
その結果、本発明の光学系から逸脱することとなり、同
時に球面収差の補正の面では安定性が得られるが、像面
特性つまりサジタル像面とメリディオナル像面を適正に
し像面の平坦性を得ることが困難になる。The condition (2) defines the refractive power of the second lens group. If the lower limit of this condition is exceeded, the refracting power of the second lens group will become large, and accordingly, the refracting power of the third lens group will also become large, and the amount of aberration generated in this lens group will increase, especially astigmatic difference. It becomes large and the good performance of the lens system cannot be obtained. If the lower limit of the condition (2) is exceeded, the lower limit of the condition (1) may be exceeded. When the value exceeds the upper limit of the condition (2), the refractive power of the second lens group becomes small and the third lens group has a positive refractive power.
As a result, the optical system deviates from the optical system of the present invention, and at the same time, stability can be obtained in terms of correction of spherical aberration, but image plane characteristics, that is, sagittal image plane and meridional image plane are optimized to obtain image plane flatness. Becomes difficult.
【００２５】条件（３）は第３レンズ群の横倍率を規定
したものである。条件（３）の下限を越えると縮小倍率
になり、本発明の目的に反することになり、上限を越え
ると全体の小型化にとっては望ましいが収差の面でも拡
大倍率になるため収差補正にとって好ましくない。The condition (3) defines the lateral magnification of the third lens group. When the value goes below the lower limit of the condition (3), the reduction ratio is obtained, which is contrary to the object of the present invention. When the value exceeds the upper limit, it is desirable for downsizing of the whole, but it is not preferable for aberration correction because the magnification becomes the enlargement factor. .
【００２６】[0026]
【実施例】次に本発明の標準レンズの各実施例を示す。 実施例１ ｒ1 ＝-2420.1421 ｄ1 ＝1.8500 ｎ1 ＝1.49700 ν1 ＝81.61 ｒ2 ＝36.5004 ｄ2 ＝3.5509 ｒ3 ＝100.7016 ｄ3 ＝4.8417 ｎ2 ＝1.79952 ν2 ＝42.24 ｒ4 ＝-67.6254 ｄ4 ＝0.1000 ｒ5 ＝27.3327 ｄ5 ＝3.4403 ｎ3 ＝1.80400 ν3 ＝46.57 ｒ6 ＝56.0389 ｄ6 ＝1.0762 ｒ7 ＝1220.1955 ｄ7 ＝2.8000 ｎ4 ＝1.64769 ν4 ＝33.80 ｒ8 ＝26.7418 ｄ8 ＝2.7885 ｒ9 ＝∞（絞り） ｄ9 ＝3.9285 ｒ10＝-21.7448 ｄ10＝2.8000 ｎ5 ＝1.63636 ν5 ＝35.37 ｒ11＝58.9566 ｄ11＝0.1000 ｒ12＝47.2838 ｄ12＝6.4249 ｎ6 ＝1.74100 ν6 ＝52.68 ｒ13＝-37.4801 ｄ13＝Ｄ1 （可変） ｒ14＝49.6107 ｄ14＝5.3813 ｎ7 ＝1.77250 ν7 ＝49.66 ｒ15＝-70.8082（非球面）ｄ15＝Ｄ2 （可変） ｒ16＝137.9856 ｄ16＝2.8000 ｎ8 ＝1.69895 ν8 ＝30.12 ｒ17＝30.1189 （非球面）ｄ17＝3.4857 ｒ18＝-130.8587 ｄ18＝3.7185 ｎ9 ＝1.80400 ν9 ＝46.57 ｒ19＝-41.9119 無限遠物点時 ｆ＝45.100，Ｆ／2.060 ,2ω=51.24 ° 倍率−1/2 の時 ｆ＝45.077，Ｆ／2.355 非球面係数 （第１５面）Ｅ＝0.95642 ×10-5，Ｆ＝-0.60951×10-9 Ｇ＝-0.28054×10-10 ，Ｈ＝0.98348 ×10-13 （第１７面）Ｅ＝-0.41425×10-5，Ｆ＝0.16418 ×10-7 Ｇ＝-0.76281×10-10 ，Ｈ＝0.25459 ×10-12 ｆ2 ／ｆ1 ＝0.0275，ｆ2 ／ｆ＝0.8540，β3 ＝1.229EXAMPLES Examples of the standard lens of the present invention will be shown below. Example 1 r 1 = -2420.1421 d 1 = 1.8500 n 1 = 1.49700 v 1 = 81.61 r 2 = 36.5004 d 2 = 3.5509 r 3 = 100.7016 d 3 = 4.8417 n 2 = 1.79952 v 2 = 42.24 r 4 = -67.6254 d 4 = 0.1000 r 5 = 27.3327 d 5 = 3.4403 n 3 = 1.80400 ν 3 = 46.57 r 6 = 56.0389 d 6 = 1.0762 r 7 = 1220.1955 d 7 = 2.8000 n 4 = 1.64769 ν 4 = 33.80 r 8 = 26.7418 d 8 = 2.7885 r 9 = ∞ (aperture) d 9 = 3.9285 r 10 = -21.7448 d 10 = 2.8000 n 5 = 1.63636 v 5 = 35.37 r 11 = 58.9566 d 11 = 0.1000 r 12 = 47.2838 d 12 = 6.4249 n 6 = 1.74100 v 6 = 52.68 r 13 = -37.4801 d 13 = D 1 (variable) r 14 = 49.6107 d 14 = 5.3813 n 7 = 1.77250 ν 7 = 49.66 r 15 = -70.8082 (aspherical surface) d 15 = D 2 (variable) r 16 = 137.9856 d 16 = 2.8000 n 8 = 1.69895 ν 8 = 30.12 r 17 = 30.1189 ( aspherical) d 17 = 3.4857 r 18 = -130.8587 d 18 = 3.7185 n 9 = 1.80400 ν 9 = 46.57 r 19 = -41.9119 No Focusing point f = 45.100, F / 2.060,2 ω = 51.24 ° Magnification −1/2 f = 45.077, F / 2.355 Aspherical surface coefficient (15th surface) E = 0.95642 × 10 -5 , F =- 0.60951 × 10 -9 G = -0.28054 × 10 -10 , H = 0.98348 × 10 -13 (17th surface) E = -0.41425 × 10 -5 , F = 0.16418 × 10 -7 G = -0.76281 × 10 -10 , H = 0.25459 × 10 -12 f 2 / f 1 = 0.0275, f 2 /f=0.8540,β 3 = 1.229
【００２７】実施例２ ｒ1 ＝-133.4000 ｄ1 ＝1.8500 ｎ1 ＝1.48749 ν1 ＝70.20 ｒ2 ＝38.1031 ｄ2 ＝3.2645 ｒ3 ＝117.6681 ｄ3 ＝5.1341 ｎ2 ＝1.80610 ν2 ＝40.95 ｒ4 ＝-57.7997 ｄ4 ＝0.3039 ｒ5 ＝27.2404 ｄ5 ＝3.4403 ｎ3 ＝1.81600 ν3 ＝46.62 ｒ6 ＝64.4609 ｄ6 ＝0.8746 ｒ7 ＝423.2916 ｄ7 ＝2.8000 ｎ4 ＝1.64769 ν4 ＝33.80 ｒ8 ＝25.7558 ｄ8 ＝Ｄ1 （可変） ｒ9 ＝∞（絞り） ｄ9 ＝3.7891 ｒ10＝-23.7240 ｄ10＝2.8000 ｎ5 ＝1.64769 ν5 ＝33.80 ｒ11＝56.1774 ｄ11＝0.1000 ｒ12＝39.1562 ｄ12＝6.5872 ｎ6 ＝1.73400 ν6 ＝51.49 ｒ13＝-42.0533 ｄ13＝0.5000 ｒ14＝48.3883 ｄ14＝5.1448 ｎ7 ＝1.81600 ν7 ＝46.62 ｒ15＝-80.9489（非球面）ｄ15＝Ｄ2 （可変） ｒ16＝454.8718 ｄ16＝2.8000 ｎ8 ＝1.69895 ν8 ＝30.12 ｒ17＝29.7132 （非球面）ｄ17＝3.3572 ｒ18＝-127.5922 ｄ18＝3.7470 ｎ9 ＝1.79952 ν9 ＝42.24 ｒ19＝-39.0223 無限遠物点時 ｆ＝45.100，Ｆ／2.060 ，2ω=51.24 ° 倍率−1/2 の時 ｆ＝45.071，Ｆ／2.383 非球面係数 （第１５面）Ｅ＝0.12272 ×10-4，Ｆ＝0.14617 ×10-8 Ｇ＝-0.44964×10-10 ，Ｈ＝0.19475 ×10-12 （第１７面）Ｅ＝-0.55361×10-5，Ｆ＝0.19317 ×10-7 Ｇ＝-0.86779×10-10 ，Ｈ＝0.38262 ×10-12 ｆ2 ／ｆ1 ＝0.1124，ｆ2 ／ｆ＝0.7457，β3 ＝1.340Example 2 r 1 = -133.4000 d 1 = 1.8500 n 1 = 1.48749 ν 1 = 70.20 r 2 = 38.1031 d 2 = 3.2645 r 3 = 117.6681 d 3 = 5.1341 n 2 = 1.80610 ν 2 = 40.95 r 4 = -57.7997 d 4 = 0.3039 r 5 = 27.2404 d 5 = 3.4403 n 3 = 1.81600 ν 3 = 46.62 r 6 = 64.4609 d 6 = 0.8746 r 7 = 423.2916 d 7 = 2.8000 n 4 = 1.64769 ν 4 = 33.80 r 8 = 25.7558 d 8 = D 1 (variable) r 9 = ∞ (aperture) d 9 = 3.7891 r 10 = -23.7240 d 10 = 2.8000 n 5 = 1.64769 ν 5 = 33.80 r 11 = 56.1774 d 11 = 0.1000 r 12 = 39.1562 d 12 = 6.5872 n 6 = 1.73400 ν 6 = 51.49 r 13 = -42.0533 d 13 = 0.5000 r 14 = 48.3883 d 14 = 5.1448 n 7 = 1.81600 ν 7 = 46.62 r 15 = -80.9489 ( aspherical) d 15 = D 2 ( Variable) r 16 = 454.8718 d 16 = 2.8000 n 8 = 1.69895 ν 8 = 30.12 r 17 = 29.7132 (aspherical surface) d 17 = 3.3572 r 18 = -127.5922 d 18 = 3.7470 n 9 = 1.79952 ν 9 = 42.24 r 19 = -39.0223 At infinity f = 45.100, F / 2.060, 2ω = 51.24 ° When magnification is −1/2 f = 45.071, F / 2.383 Aspherical surface coefficient (15th surface) E = 0.12272 × 10 -4 , F = 0.14617 × 10 -8 G = -0.44964 × 10 -10 , H = 0.19475 × 10 -12 (17th surface) E = -0.55361 × 10 -5 , F = 0.19317 × 10 -7 G = -0.86779 × 10 -10 , H = 0.38262 × 10 -12 f 2 / f 1 = 0.1124, f 2 /f=0.7457,β 3 = 1.340
【００２８】実施例３ ｒ1 ＝-91.5321 ｄ1 ＝1.8500 ｎ1 ＝1.48749 ν1 ＝70.20 ｒ2 ＝40.0220 ｄ2 ＝2.7943 ｒ3 ＝70.6585 ｄ3 ＝6.1584 ｎ2 ＝1.79952 ν2 ＝42.24 ｒ4 ＝-64.8952 ｄ4 ＝0.2500 ｒ5 ＝24.3579 ｄ5 ＝3.4403 ｎ3 ＝1.74320 ν3 ＝49.31 ｒ6 ＝66.9826 ｄ6 ＝0.8241 ｒ7 ＝213.3428 ｄ7 ＝4.0844 ｎ4 ＝1.69895 ν4 ＝30.12 ｒ8 ＝20.9404 ｄ8 ＝Ｄ1 （可変） ｒ9 ＝∞（絞り） ｄ9 ＝3.7429 ｒ10＝-26.9052 ｄ10＝2.8000 ｎ5 ＝1.57309 ν5 ＝42.57 ｒ11＝50.2542 ｄ11＝0.1000 ｒ12＝37.8180 ｄ12＝7.3051 ｎ6 ＝1.69680 ν6 ＝56.49 ｒ13＝-41.4605 ｄ13＝0.5000 ｒ14＝52.8463 ｄ14＝4.7024 ｎ7 ＝1.74320 ν7 ＝49.31 ｒ15＝-182.6936(非球面）ｄ15＝Ｄ2 （可変） ｒ16＝141.6627 ｄ16＝4.8101 ｎ8 ＝1.72825 ν8 ＝28.46 ｒ17＝31.6827 （非球面）ｄ17＝3.3122 ｒ18＝-148.5281 ｄ18＝3.8274 ｎ9 ＝1.79952 ν9 ＝42.24 ｒ19＝-41.6272 無限遠物点時 ｆ＝50.648，Ｆ／2.050, 2ω=46.26 ° 倍率−1/2 の時 ｆ＝50.752，Ｆ／2.493 非球面係数 （第１５面）Ｅ＝0.10906 ×10-4，Ｆ＝0.11232 ×10-8 Ｇ＝-0.32958×10-10 ，Ｈ＝0.15864 ×10-12 （第１７面）Ｅ＝-0.81052×10-5，Ｆ＝0.18043 ×10-7 Ｇ＝-0.80706×10-10 ，Ｈ＝0.27490 ×10-12 ｆ2 ／ｆ1 ＝0.1134，ｆ2 ／ｆ＝0.8137，β3 ＝1.368Example 3 r 1 = -91.5321 d 1 = 1.8500 n 1 = 1.48749 v 1 = 70.20 r 2 = 40.0220 d 2 = 2.7943 r 3 = 70.6585 d 3 = 6.1584 n 2 = 1.79952 v 2 = 42.24 r 4 = -64.8952 d 4 = 0.2500 r 5 = 24.3579 d 5 = 3.4403 n 3 = 1.74320 ν 3 = 49.31 r 6 = 66.9826 d 6 = 0.8241 r 7 = 213.3428 d 7 = 4.0844 n 4 = 1.69895 ν 4 = 30.12 r 8 = 20.9404 d 8 = D 1 (variable) r 9 = ∞ (aperture) d 9 = 3.7429 r 10 = -26.9052 d 10 = 2.8000 n 5 = 1.57309 ν 5 = 42.57 r 11 = 50.2542 d 11 = 0.1000 r 12 = 37.8180 d 12 ＝ 7.3051 n 6 = 1.9680 ν 6 ＝ 56.49 r 13 ＝ -41.4605 d 13 ＝ 0.5000 r 14 ＝ 52.8463 d 14 ＝ 4.7024 n 7 ＝ 1.74320 ν 7 ＝ 49.31 r 15 ＝ -182.6936 (aspheric surface) d 15 ＝ D 2 ( variable) r 16 = 141.6627 d 16 = 4.8101 n 8 = 1.72825 ν 8 = 28.46 r 17 = 31.6827 ( aspherical) d 17 = 3.3122 r 18 = -148.5281 d 18 = 3.8274 n 9 = 1.79952 ν 9 = 42.24 r 19 -41.6272 infinite object point at f = 50.648, F / 2.050, 2ω = 46.26 ° when f = 50.752 magnification -1/2, F / 2.493 aspherical coefficients (fifteenth surface) E = 0.10906 × 10 -4, F = 0.11232 × 10 -8 G = -0.32958 × 10 -10, H = 0.15864 × 10 -12 ( seventeenth surface) E = -0.81052 × 10 -5, F = 0.18043 × 10 -7 G = -0.80706 × 10 - 10 , H = 0.27490 × 10 -12 f 2 / f 1 = 0.1134, f 2 /f=0.8137,β 3 = 1.368
【００２９】実施例４ ｒ1 ＝-75.3961 ｄ1 ＝1.8500 ｎ1 ＝1.50378 ν1 ＝66.81 ｒ2 ＝53.3337 ｄ2 ＝0.8691 ｒ3 ＝85.0362 ｄ3 ＝4.6801 ｎ2 ＝1.79952 ν2 ＝42.24 ｒ4 ＝-66.9142 ｄ4 ＝0.2500 ｒ5 ＝24.6932 ｄ5 ＝3.4403 ｎ3 ＝1.72600 ν3 ＝53.56 ｒ6 ＝67.8238 ｄ6 ＝0.7488 ｒ7 ＝203.1281 ｄ7 ＝7.0544 ｎ4 ＝1.69895 ν4 ＝30.12 ｒ8 ＝20.8140 ｄ8 ＝3.9272 ｒ9 ＝∞（絞り） ｄ9 ＝2.6228 ｒ10＝-30.1652 ｄ10＝2.3350 ｎ5 ＝1.56444 ν5 ＝43.78 ｒ11＝40.6017 ｄ11＝0.1000 ｒ12＝30.9453 ｄ12＝6.1075 ｎ6 ＝1.69680 ν6 ＝55.52 ｒ13＝-48.5382 ｄ13＝0.5000 ｒ14＝40.5990 ｄ14＝6.6765 ｎ7 ＝1.67000 ν7 ＝57.33 ｒ15＝695.6885（非球面）ｄ15＝Ｄ1 （可変） ｒ16＝139.7584 ｄ16＝5.5621 ｎ8 ＝1.67270 ν8 ＝32.10 ｒ17＝34.9491 ｄ17＝2.4860 ｒ18＝-116.2519 ｄ18＝3.1434 ｎ9 ＝1.74950 ν9 ＝35.27 ｒ19＝-44.9226 無限遠物点時 ｆ＝60.999，Ｆ／2.550 , 2ω=39.04 ° 倍率−1/2 の時 ｆ＝60.823，Ｆ／3.010 非球面係数 Ｅ＝0.96757 ×10-5，Ｆ＝0.10648 ×10-7 Ｇ＝0.47025 ×10-10 ，Ｈ＝0.27886 ×10-12 ｆ2 ／ｆ1 ＝0.0711，ｆ2 ／ｆ＝0.7402，β3 ＝1.175 ただしｒ1 ，ｒ2 ，・・・ はレンズ各面の曲率半径、ｄ
1 ，ｄ2 ，・・・ は各レンズの肉厚およびレンズ間隔、ｎ
1 ，ｎ2 ，・・・ は各レンズの屈折率、ν1 ，ν2 ，・・・
は各レンズのアッベ数である。Example 4 r 1 = -75.3961 d 1 = 1.8500 n 1 = 1.50378 v 1 = 66.81 r 2 = 53.3337 d 2 = 0.8691 r 3 = 85.0362 d 3 = 4.6801 n 2 = 1.79952 v 2 = 42.24 r 4 = -66.9142 d 4 = 0.2500 r 5 = 24.6932 d 5 = 3.4403 n 3 = 1.72600 ν 3 = 53.56 r 6 = 67.8238 d 6 = 0.7488 r 7 = 203.1281 d 7 = 7.0544 n 4 = 1.69895 ν 4 = 30.12 r 8 = 20.8140 d 8 = 3.9272 r 9 = ∞ (aperture) d 9 = 2.6228 r 10 = -30.1652 d 10 = 2.3350 n 5 = 1.56444 ν 5 = 43.78 r 11 = 40.6017 d 11 = 0.1000 r 12 = 30.9453 d 12 = 6.1075 n 6 = 1.9680 ν 6 = 55.52 r 13 = -48.5382 d 13 = 0.5000 r 14 = 40.5990 d 14 = 6.6765 n 7 = 1.67000 ν 7 = 57.33 r 15 = 695.6885 (aspherical surface) d 15 = D 1 (variable) r 16 = 139.7584 d 16 = 5.5621 n 8 = 1.67270 ν 8 = 32.10 r 17 = 34.9491 d 17 = 2.4860 r 18 = -116.2519 d 18 = 3.1434 n 9 = 1.74950 ν 9 = 35.27 r 19 = -44.9226 infinite object point f = 60.999, F / 2.550, 2ω = 39.04 ° when f = 60.823 magnification -1/2, F / 3.010 aspheric coefficient E = 0.96757 × 10 -5, F = 0.10648 × 10 -7 G = 0.47025 × 10 - 10 , H = 0.27886 × 10 -12 f 2 / f 1 = 0.0711, f 2 /f=0.7402, β 3 = 1.175, where r 1 , r 2 , ... Are the radii of curvature of each lens surface, d
1 , d 2 , ... Is the thickness of each lens and the lens interval, n
1 , n 2 , ... Is the refractive index of each lens, ν 1 , ν 2 ,.
Is the Abbe number of each lens.
【００３０】実施例１は図１に示す構成で三つのレンズ
群よりなる。第１レンズ群は負のレンズ成分ではじま
り、最終レンズ群である第３レンズ群は、負レンズと正
レンズとで構成され、正レンズは像側に曲率の強い凸面
を向けている。これによりレリーズ時のミラー通過軌跡
に対し有利な形状である。Example 1 has a configuration shown in FIG. 1 and is composed of three lens groups. The first lens group starts with a negative lens component, and the third lens group, which is the final lens group, is composed of a negative lens and a positive lens, and the positive lens has a convex surface with a strong curvature facing the image side. As a result, the shape is advantageous for the mirror passing locus at the time of release.
【００３１】この実施例１は、画角５１．３°、口径比
２．０６の標準レンズであり、非球面を第２レンズ群と
第３レンズ群とに使用して性能向上を図っている。実施
例１の無限遠時の収差状況は図５に、撮影倍率１／２倍
の時の収差状況は図６に示す通りである。これらからフ
ォーカシング時の収差変動が十分小さく抑えられている
ことがわかる。これは、この実施例では、第２レンズ群
と第３レンズ群との間隔および第２レンズ群中のレンズ
成分間の間隔であるｄ13をフォーカシング中変化させる
ことによるフローティングの効果によるものである。Example 1 is a standard lens having an angle of view of 51.3 ° and an aperture ratio of 2.06, and aspherical surfaces are used for the second lens group and the third lens group to improve performance. . The aberration situation at infinity of Example 1 is as shown in FIG. 5, and the aberration situation at a magnification of 1/2 is as shown in FIG. From these, it can be seen that the aberration variation during focusing is sufficiently suppressed. This is because, in this embodiment, the distance between the second lens group and the third lens group and the distance d 13 between the lens components in the second lens group are changed during focusing to cause a floating effect. .
【００３２】実施例２は、図２に示す構成で、実施例１
と同様にフォーカシング時に第１レンズ群と第２レンズ
群との群間隔と第２レンズ群と第３レンズ群の群間隔を
変化させて、フォーカシング時にフローティングを行な
っている。この実施例の無限遠および倍率１／２の時の
収差状況は夫々図７，図８に示す通りである。The second embodiment has the configuration shown in FIG.
Similarly, the group spacing between the first lens group and the second lens group and the group spacing between the second lens group and the third lens group are changed during focusing, and floating is performed during focusing. The aberrations in this example at infinity and a magnification of 1/2 are as shown in FIGS. 7 and 8, respectively.
【００３３】実施例３は、図３に示す通りで、実施例２
と同様のフローティングを行なっている。この実施例
は、画角４６．３°、口径比２．０５の標準レンズであ
る。実施例３の無限遠および倍率１／２の時の収差状況
は、図９，図１０に示す通りである。Example 3 is as shown in FIG.
The same floating is done. This example is a standard lens with an angle of view of 46.3 ° and an aperture ratio of 2.05. The aberrations of Example 3 at infinity and a magnification of 1/2 are as shown in FIGS. 9 and 10.
【００３４】実施例４は、図４に示す通りの構成で画角
３９．０５°、口径比２．５５の標準レンズである。画
角が狭く収差補正が容易であるので、第２レンズ群に１
面設けたのみである。又フォーカシング時の可変群間隔
は、第２レンズ群と第３レンズ群のみである。この実施
例の無限遠および倍率１／２での収差状況は図１１，図
１２に示す通りで、非点収差の変動は残留するが、これ
は実用上問題ではない。又球面収差に影響の少ない第２
レンズ群と第３レンズ群との間隔を変化させることによ
り非点収差の変動は抑えられる。Example 4 is a standard lens having a configuration as shown in FIG. 4 and an angle of view of 39.05 ° and an aperture ratio of 2.55. Since the angle of view is narrow and aberration correction is easy,
It is only provided on the surface. Further, the variable group spacing during focusing is only the second lens group and the third lens group. The aberrations in this example at infinity and half magnification are as shown in FIGS. 11 and 12, and the fluctuation of astigmatism remains, but this is not a practical problem. In addition, the second that has little effect on spherical aberration
By changing the distance between the lens group and the third lens group, fluctuations in astigmatism can be suppressed.
【００３５】各実施例の断面図中（Ａ）は無限遠物点に
フォーカシングした時、（Ｂ）は倍率−１／２の時のも
のである。In the cross-sectional views of the examples, (A) is the one when focusing on an object point at infinity, and (B) is the one when the magnification is -1/2.
【００３６】本発明の実施例中で用いられている非球面
の形状は、光軸方向をｘ軸、光軸に直角な方向をｙ軸と
した時次の式で表わされる。 The shape of the aspherical surface used in the embodiments of the present invention is represented by the following equation when the optical axis direction is the x axis and the direction perpendicular to the optical axis is the y axis.
【００３７】ただし、Ｃ＝１／ｒ（ｒは非球面の面頂で
の曲率半径、Ｅ，Ｆ，Ｇ，Ｈ，・・・は非球面係数であ
る。However, C = 1 / r (r is the radius of curvature at the apex of the aspherical surface, and E, F, G, H, ... Are aspherical surface coefficients.
【００３８】[0038]
【発明の効果】本発明は、レンズ系の構成とフローティ
ングの採用によって無限遠物点より近距離まで安定して
光学性能が得られ又ミラー禁止域を確保するのに都合の
よい構成になっている。According to the present invention, the construction of the lens system and the adoption of the floating structure make it possible to obtain stable optical performance from an object point at infinity to a short distance and to secure a mirror prohibited area. There is.
【図１】本発明の実施例１の断面図FIG. 1 is a sectional view of a first embodiment of the present invention.
【図２】本発明の実施例２の断面図FIG. 2 is a sectional view of a second embodiment of the present invention.
【図３】本発明の実施例３の断面図FIG. 3 is a sectional view of a third embodiment of the present invention.
【図４】本発明の実施例４の断面図FIG. 4 is a sectional view of a fourth embodiment of the present invention.
【図５】本発明の実施例１の無限遠物点に対する収差曲
線図FIG. 5 is an aberration curve diagram for an object point at infinity according to the first embodiment of the present invention.
【図６】本発明の実施例１の倍率−１／２での収差曲線
図FIG. 6 is an aberration curve diagram at a magnification of −1/2 according to the first embodiment of the present invention.
【図７】本発明の実施例２の無限遠物点に対する収差曲
線図FIG. 7 is an aberration curve diagram for an object point at infinity according to Example 2 of the present invention.
【図８】本発明の実施例２の倍率−１／２での収差曲線
図8 is an aberration curve diagram at a magnification of −1/2 according to Example 2 of the present invention. FIG.
【図９】本発明の実施例３の無限遠物点に対する収差曲
線図FIG. 9 is an aberration curve diagram for an object point at infinity according to Example 3 of the present invention.
【図１０】本発明の実施例３の倍率−１／２での収差曲
線図FIG. 10 is an aberration curve diagram at a magnification of −1/2 according to Example 3 of the present invention.
【図１１】本発明の実施例４の無限遠物点に対する収差
曲線図FIG. 11 is an aberration curve diagram for an object point at infinity according to Example 4 of the present invention.
【図１２】本発明の実施例４の倍率−１／２での収差曲
線図FIG. 12 is an aberration curve diagram at a magnification of −1/2 according to Example 4 of the present invention.
【図１３】実施例１において、各間隔を０．０１ｍｍ変
化させた時の球面収差の変化量FIG. 13 is the amount of change in spherical aberration when each interval is changed by 0.01 mm in Example 1.
【図１４】実施例１において、各間隔を０．０１ｍｍ変
化させた時の非点収差の変化量FIG. 14 is the amount of change in astigmatism when each interval is changed by 0.01 mm in Example 1.
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成５年８月１２日[Submission date] August 12, 1993
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００３[Name of item to be corrected] 0003
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【０００３】前者のレンズ系は、明るさに重点をおくた
めに光学性能においては十分とは云えないものが多い。
また後者のレンズ系に属するマクロレンズと称されてい
るレンズ系は、変形ガウスタイプのレンズ系で、このタ
イプの対称性の利点を生かして、近距離物点にフォーカ
シングした時の収差変動を抑えるフローティング方式を
採用して光学性能の向上がはかられている。このような
レンズ系の従来例としては、特開昭６０−１００１５号
公報や特開昭６２−１９５６１７号公報が知られてい
る。また、フローティング機構の簡素化を考慮した従来
例として特開平１−２１４８１２号公報のレンズ系が知
られている。Many of the former lens systems cannot be said to have sufficient optical performance because they emphasize brightness.
The lens system called macro lens, which belongs to the latter lens system, is a modified Gauss type lens system, and takes advantage of the symmetry of this type to suppress aberration fluctuations when focusing on a short-distance object point. The floating system is adopted to improve the optical performance. Known examples of such a lens system are disclosed in Japanese Patent Laid-Open Nos. 60-10015 and 62-195617. Further, as a conventional example in consideration of simplification of a floating mechanism, a lens system disclosed in Japanese Patent Laid-Open No. 1-214812 is known.
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００４[Correction target item name] 0004
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【０００４】[0004]
【発明が解決しようとする課題】従来のいわゆる標準レ
ンズは、有限物点特に高撮影倍率時に性能が劣化する欠
点を有していた。一方マクロレンズと云われるレンズ系
は、口径比が小であり又無限遠物点から近距離物点まで
の収差変動は抑えられているがサジタル像面とメリディ
オナル像面の隔差や倍率の色収差は残留していた。又対
称型レンズの一つの欠点であるバックフォーカスの確保
が困難であり又、最終レンズの形状によってはミラー禁
止域を満足する事が困難となる等の問題がある。The conventional so-called standard lens has a drawback that its performance deteriorates at a finite object point, especially at a high photographing magnification. On the other hand, a lens system called a macro lens has a small aperture ratio and suppresses aberration variation from an object point at infinity to an object point at a short distance, but the difference between the sagittal image surface and the meridional image surface and the chromatic aberration of magnification are It remained. Further, there is a problem that it is difficult to secure the back focus, which is one of the drawbacks of the symmetrical lens, and it is difficult to satisfy the mirror prohibited area depending on the shape of the final lens.
Claims (1)
群と、正の屈折力の第２レンズ群と、負の屈折力の第３
レンズ群とよりなり、前記第１レンズ群が正の屈折力の
前群と負の屈折力の後群とよりなり、前記前群が像側に
強い曲率の凹面を向けた負のレンズ成分と正のレンズ成
分とからなり、前記後群が物体側に強い曲率の凸面を向
けた正のレンズ成分と負のレンズ成分からなり、前記第
２レンズ群が物体側に強い曲率を有する凹面を向けた負
のレンズ成分と少なくとも一つの正のレンズ成分とから
なり、前記第３レンズ群が像側に強い曲率を有する負の
レンズ成分と像側に凸面を向けた正のレンズ成分からな
り、全系を物体側に相対移動させながら第１レンズ群と
第２レンズ群の間隔と第２レンズ群と第３レンズ群の間
隔のうちの少なくとも一つの間隔を変化させてフォーカ
シングを行なう標準レンズ。1. A first lens group having a positive refractive power, a second lens group having a positive refractive power, and a third lens group having a negative refractive power in order from the object side.
A lens unit, the first lens unit includes a front unit having a positive refractive power and a rear unit having a negative refractive power, and the front unit has a negative lens component having a concave surface having a strong curvature toward the image side. A positive lens component, wherein the rear lens group comprises a positive lens component having a convex surface having a strong curvature toward the object side and a negative lens component, and the second lens group has a concave surface having a strong curvature toward the object side. A negative lens component and at least one positive lens component, and the third lens group includes a negative lens component having a strong curvature on the image side and a positive lens component having a convex surface facing the image side. A standard lens for focusing by changing at least one of the distance between the first lens group and the second lens group and the distance between the second lens group and the third lens group while moving the system relatively to the object side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30624392A JP3306129B2 (en) | 1992-10-20 | 1992-10-20 | Standard lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30624392A JP3306129B2 (en) | 1992-10-20 | 1992-10-20 | Standard lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06130291A true JPH06130291A (en) | 1994-05-13 |
| JP3306129B2 JP3306129B2 (en) | 2002-07-24 |
Family
ID=17954730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30624392A Expired - Fee Related JP3306129B2 (en) | 1992-10-20 | 1992-10-20 | Standard lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3306129B2 (en) |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5654826A (en) * | 1995-04-04 | 1997-08-05 | Nikon Corporation | Zoom lens system having a vibration reduction function |
| US5781340A (en) * | 1995-02-10 | 1998-07-14 | Nikon Corporation | Gauss lens with image stabilizing function |
| US5828499A (en) * | 1995-02-23 | 1998-10-27 | Nikon Corporation | Zoom lens system |
| US5831775A (en) * | 1995-03-10 | 1998-11-03 | Nikon Corporation | Long focal length microlens system |
| JP2001337265A (en) * | 2000-05-24 | 2001-12-07 | Tochigi Nikon Corp | Photographing lens utilizing floating |
| JP2009210748A (en) * | 2008-03-04 | 2009-09-17 | Nikon Corp | Photographic lens, optical equipment having the photographic lens, and imaging method using the photographic lens |
| US7715118B2 (en) | 2007-04-09 | 2010-05-11 | Hoya Corporation | Macro lens system |
| US7777974B2 (en) | 2007-12-13 | 2010-08-17 | Nikon Corporation | Macro lens, optical apparatus, and method for manufacturing the macro lens |
| US7903348B2 (en) | 2008-03-04 | 2011-03-08 | Nikon Corporation | Rear-focus optical system, imaging apparatus and method for focusing the same |
| JP2011242610A (en) * | 2010-05-18 | 2011-12-01 | Tochigi Nikon Corp | Photographic lens, and inspection device including the same |
| JP2012181508A (en) * | 2011-02-10 | 2012-09-20 | Sigma Corp | Imaging optics |
| US8670194B2 (en) | 2010-08-25 | 2014-03-11 | Panasonic Corporation | Single focal length lens system, interchangeable lens apparatus and camera system |
| US8717682B2 (en) | 2010-08-25 | 2014-05-06 | Panasonic Corporation | Single focal length lens system, interchangeable lens apparatus and camera system |
| US9201219B2 (en) | 2012-02-28 | 2015-12-01 | Ricoh Imaging Company, Ltd. | Close-distance correcting lens system |
| US9557539B2 (en) | 2013-06-19 | 2017-01-31 | Ricoh Imaging Company, Ltd. | Fixed focal-length lens system |
| JP2019144441A (en) * | 2018-02-22 | 2019-08-29 | 株式会社シグマ | Macro lens |
| JP2020052118A (en) * | 2018-09-25 | 2020-04-02 | キヤノン株式会社 | Optical system and image capturing device having the same |
-
1992
- 1992-10-20 JP JP30624392A patent/JP3306129B2/en not_active Expired - Fee Related
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5781340A (en) * | 1995-02-10 | 1998-07-14 | Nikon Corporation | Gauss lens with image stabilizing function |
| US5828499A (en) * | 1995-02-23 | 1998-10-27 | Nikon Corporation | Zoom lens system |
| US5831775A (en) * | 1995-03-10 | 1998-11-03 | Nikon Corporation | Long focal length microlens system |
| US5654826A (en) * | 1995-04-04 | 1997-08-05 | Nikon Corporation | Zoom lens system having a vibration reduction function |
| JP4550970B2 (en) * | 2000-05-24 | 2010-09-22 | 株式会社栃木ニコン | Floating photography lens |
| JP2001337265A (en) * | 2000-05-24 | 2001-12-07 | Tochigi Nikon Corp | Photographing lens utilizing floating |
| US7715118B2 (en) | 2007-04-09 | 2010-05-11 | Hoya Corporation | Macro lens system |
| US7777974B2 (en) | 2007-12-13 | 2010-08-17 | Nikon Corporation | Macro lens, optical apparatus, and method for manufacturing the macro lens |
| US7903348B2 (en) | 2008-03-04 | 2011-03-08 | Nikon Corporation | Rear-focus optical system, imaging apparatus and method for focusing the same |
| JP2009210748A (en) * | 2008-03-04 | 2009-09-17 | Nikon Corp | Photographic lens, optical equipment having the photographic lens, and imaging method using the photographic lens |
| JP2011242610A (en) * | 2010-05-18 | 2011-12-01 | Tochigi Nikon Corp | Photographic lens, and inspection device including the same |
| US8717682B2 (en) | 2010-08-25 | 2014-05-06 | Panasonic Corporation | Single focal length lens system, interchangeable lens apparatus and camera system |
| US8670194B2 (en) | 2010-08-25 | 2014-03-11 | Panasonic Corporation | Single focal length lens system, interchangeable lens apparatus and camera system |
| JP2012181508A (en) * | 2011-02-10 | 2012-09-20 | Sigma Corp | Imaging optics |
| US9201219B2 (en) | 2012-02-28 | 2015-12-01 | Ricoh Imaging Company, Ltd. | Close-distance correcting lens system |
| US9557539B2 (en) | 2013-06-19 | 2017-01-31 | Ricoh Imaging Company, Ltd. | Fixed focal-length lens system |
| JP2019144441A (en) * | 2018-02-22 | 2019-08-29 | 株式会社シグマ | Macro lens |
| JP2020052118A (en) * | 2018-09-25 | 2020-04-02 | キヤノン株式会社 | Optical system and image capturing device having the same |
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