JP2020160100A - Imaging optical system - Google Patents
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Abstract
Description
本発明はデジタルカメラ、ビデオカメラなどに用いられる撮影レンズに好適な結像光学系に関するものである。 The present invention relates to an imaging optical system suitable for a photographing lens used in a digital camera, a video camera, or the like.
長焦点距離を有する結像光学系として、物体側から像側へ順に、正の屈折力の第１レンズ群Ｇ１、負の屈折力の第２レンズ群Ｇ２、正の屈折力を持つ第３レンズ群Ｇ３を配置した、結像光学系が知られている。 As an imaging optical system having a long focal length, in order from the object side to the image side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens having a positive refractive power. An imaging optical system in which the group G3 is arranged is known.
近年、デジタルカメラなどに使用される撮像素子の高画素化に伴い、大口径比を持ちながら、諸収差が十分に補正され、画面全域で高い光学性能を有する結像光学系が求められている。長焦点距離を有する結像光学系においては、軸上色収差に起因する光学性能低下が課題となるため、蛍石に代表される、正の異常部分分散性が大きく、低屈折率低分散の光学材料を正レンズ材料として用いることが一般的である。 In recent years, with the increase in the number of pixels of image pickup elements used in digital cameras and the like, there is a demand for an imaging optical system having a large aperture ratio, sufficiently correcting various aberrations, and having high optical performance over the entire screen. .. In an imaging optical system having a long focal length, deterioration of optical performance due to axial chromatic aberration becomes a problem. Therefore, positive anomalous partial dispersibility represented by fluorite is large, and low refractive index and low dispersion optics are used. It is common to use the material as a positive lens material.
大口径比を持つ結像光学系を実現するためには、正の屈折力を大きくする必要があるが、低屈折率の光学材料を使用したレンズの屈折力を大きくすると、曲率が大きくなり、諸収差の悪化を招く。特許文献１、特許文献２記載の結像光学系は、大口径比化と小型軽量化を達成しながら、色収差は補正されているが、球面収差などの諸収差の発生が大きく、光学性能が十分とは言えない。 In order to realize an imaging optical system with a large aperture ratio, it is necessary to increase the positive refractive power, but if the refractive power of a lens using an optical material with a low refractive index is increased, the curvature becomes large. It causes deterioration of various aberrations. In the imaging optical systems described in Patent Documents 1 and 2, chromatic aberrations are corrected while achieving a large diameter ratio and a small size and light weight, but various aberrations such as spherical aberrations are generated and the optical performance is high. Not enough.
本発明はこのような状況に鑑みてなされたものであり、小型軽量化を達成しながら、諸収差を良好に補正した大口径望遠レンズとして使用可能な結像光学系を提供することを目的とする。 The present invention has been made in view of such a situation, and an object of the present invention is to provide an imaging optical system that can be used as a large-diameter telephoto lens in which various aberrations are satisfactorily corrected while achieving compactness and weight reduction. To do.
上記課題を解決するために、本発明の結像光学系は、物体側から像側へ順に、正の屈折力の第１レンズ群Ｇ１、負の屈折力の第２レンズ群Ｇ２、正の屈折力の第３レンズ群Ｇ３からなる結像光学系において、前記第１レンズ群Ｇ１は、第１レンズ群Ｇ１内の最も広い空気間隔を境に、物体側から順に第１Ａレンズ群Ｇ１Ａと第１Ｂレンズ群Ｇ１Ｂからなり、前記第２レンズ群Ｇ２を光軸に沿って移動させることによりフォーカシングを行い、前記第３レンズ群Ｇ３の少なくとも一部を光軸に対して垂直方向成分を含んで移動させることにより防振を行い、以下に示す条件式を満足することとした。
（１）ｆ１／ｆ＞０．６１
（２）−０．６６＜ｆ２／ｆ＜−０．４
（３）β２＜４．２
但し、
ｆ：無限遠合焦時の前記結像光学系全系の焦点距離
ｆ１：第１レンズ群Ｇ１の焦点距離
ｆ２：第２レンズ群Ｇ２の焦点距離
β２：無限遠合焦時の第２レンズ群Ｇ２の横倍率
In order to solve the above problems, in the imaging optical system of the present invention, the first lens group G1 having a positive refractive force, the second lens group G2 having a negative refractive force, and the positive refraction in this order from the object side to the image side. In the imaging optical system including the third lens group G3 of force, the first lens group G1 has the first A lens group G1A and the first B in order from the object side with the widest air spacing in the first lens group G1 as a boundary. It consists of a lens group G1B, focusing is performed by moving the second lens group G2 along the optical axis, and at least a part of the third lens group G3 is moved including a component in the direction perpendicular to the optical axis. As a result, vibration isolation was performed and the conditional expression shown below was satisfied.
(1) f1 / f> 0.61
(2) -0.66 <f2 / f <-0.4
(3) β2 <4.2
However,
f: Focal length of the entire imaging optical system during infinity focusing f1: Focal length of the first lens group G1 f2: Focal length of the second lens group G2 β2: Second lens group during infinity focusing Horizontal magnification of G2
また、第２の発明はさらに、以下に示す条件式を満足することとした。
（４）νｄｐ１ｆ＞６０
（５）θｇＦｐ１ｆ−０．６４８３＋０．００１８×νｄｐ１ｆ＞０．００１
但し、
νｄｐ１ｆ：前記結像光学系のうち最も物体側に位置する正レンズの、ｄ線に関するアッベ数
θｇＦｐ１ｆ：前記結像光学系のうち最も物体側に位置する正レンズの、ｇ線とＦ線に関する部分分散比
Further, the second invention further satisfies the conditional expression shown below.
(4) νdp1f> 60
(5) θgFp1f-0.6483 + 0.0018 × νdp1f> 0.001
However,
νdp1f: Abbe number related to d-line of the positive lens located closest to the object side in the imaging optical system θgFp1f: Part related to g-line and F-line of the positive lens located closest to the object side in the imaging optical system Dispersion ratio
また、第３の発明はさらに、前記第２レンズ群Ｇ２が少なくとも１枚の正レンズと、複数の負レンズとを有し、以下に示す条件式を満足することとした。
（６）θｇＦｐ２−０．６４８３＋０．００１８×νｄｐ２＞０．０１
（７）θｇＦｎ２−０．６４８３＋０．００１８×νｄｎ２＜−０．００１
但し、
νｄｐ２：前記第２レンズ群Ｇ２が有する正レンズうち、少なくとも１枚のｄ線に関するアッベ数
θｇＦｐ２：前記第２レンズ群Ｇ２が有する正レンズうち、少なくとも１枚のｇ線とＦ線に関する部分分散比
νｄｎ２：前記第２レンズ群Ｇ２が有する負レンズのうち、少なくとも１枚のｄ線に関するアッベ数
θｇＦｎ２：前記第２レンズ群Ｇ２が有する負レンズのうち、少なくとも１枚のｇ線とＦ線に関する部分分散比
Further, in the third invention, the second lens group G2 has at least one positive lens and a plurality of negative lenses, and satisfies the conditional expression shown below.
(6) θgFp2-0.6483 + 0.0018 × νdp2> 0.01
(7) θgFn2-0.6483 + 0.0018 × νdn2 <-0.001
However,
νdp2: Abbe number θgFp2 for at least one d-line of the positive lenses of the second lens group G2: partial dispersion ratio of at least one g-line and F-line of the positive lenses of the second lens group G2. νdn2: Abbe number θgFn2 for at least one d-line among the negative lenses of the second lens group G2: a portion related to at least one g-line and F-line among the negative lenses of the second lens group G2. Dispersion ratio
また、第４の発明はさらに、以下に示す条件式を満足することとした。
（８）０．０２＜Ｌ１Ａ１Ｂ／Ｌ＜０．２
但し、
Ｌ：前記結像光学系のうち、最も物体側のレンズ面から像面までの距離
Ｌ１Ａ１Ｂ：前記第１レンズ群Ｇ１における最大空気間隔
Further, the fourth invention further satisfies the conditional expression shown below.
(8) 0.02 <L1A1B / L <0.2
However,
L: Distance from the lens surface to the image surface on the object side of the imaging optical system L1A1B: Maximum air spacing in the first lens group G1
また、第５の発明はさらに、前記第１Ａレンズ群Ｇ１Ａは、２枚の正レンズを有し、以下に示す条件式を満足することとした。
（９）νｄｐ１Ａ＞６０
（１０）θｇＦｐ１Ａ−０．６４８３＋０．００１８×νｄｐ１Ａ＞０．００１
但し、
νｄｐ１Ａ：第１Ａレンズ群Ｇ１Ａが有する正レンズのうち、ｄ線に関するアッベ数が最も小さい正レンズのｄ線に関するアッベ数
θｇＦｐ１Ａ：第１Ａレンズ群Ｇ１Ａが有する正レンズのうち、ｄ線に関するアッベ数が最も小さい正レンズのｇ線とＦ線に関する部分分散比
Further, in the fifth invention, the first A lens group G1A has two positive lenses and satisfies the conditional expression shown below.
(9) νdp1A> 60
(10) θgFp1A-0.6483 + 0.0018 × νdp1A> 0.001
However,
νdp1A: Abbe number for the d-line of the positive lens having the smallest Abbe number for the d-line among the positive lenses of the first A lens group G1A θgFp1A: Abbe number for the d-line among the positive lenses of the first A lens group G1A Partial dispersion ratio for g-line and F-line of the smallest positive lens
また、第６の発明はさらに、前記第３レンズ群Ｇ３は、物体側から順に正の屈折力を有する第３Ａレンズ群Ｇ３Ａと、負の屈折力を有する第３Ｂレンズ群Ｇ３Ｂと、正の屈折力を有する第３Ｃレンズ群Ｇ３Ｃからなり、前記第３Ｂレンズ群Ｇ３Ｂを光軸に対して垂直方向成分を含んで移動させることにより防振を行うこととした。 Further, in the sixth invention, the third lens group G3 further includes a third A lens group G3A having a positive refractive power, a third B lens group G3B having a negative refractive power, and a positive refraction in order from the object side. It is composed of a third C lens group G3C having a power, and vibration isolation is performed by moving the third B lens group G3B including a component in the direction perpendicular to the optical axis.
また、第７の発明はさらに、前記第３Ａレンズ群Ｇ３Ａは、少なくとも１枚の正レンズと、少なくとも１枚の負レンズを有し、以下に示す条件式を満足することとした。
（１１）νｄｐ３＞６０
（１２）θｇＦｐ３−０．６４８３＋０．００１８×νｄｐ３＞０．００５
νｄｐ３：前記第３レンズ群Ｇ３が有する少なくとも１枚の正レンズの、ｄ線に関するアッベ数
θｇＦｐ３：前記第３レンズ群Ｇ３が有する少なくとも１枚の正レンズの、ｇ線とＦ線に関する部分分散比
Further, in the seventh invention, the third A lens group G3A has at least one positive lens and at least one negative lens, and satisfies the conditional expression shown below.
(11) νdp3> 60
(12) θgFp3-0.6483 + 0.0018 × νdp3> 0.005
νdp3: Abbe number θgFp3 for d-line of at least one positive lens of the third lens group G3: partial dispersion ratio of at least one positive lens of the third lens group G3 with respect to g-line and F-line.
本発明によれば、小型軽量化を達成しながら、諸収差を良好に補正した大口径望遠レンズとして使用可能な結像光学系を提供することが可能となる。 According to the present invention, it is possible to provide an imaging optical system that can be used as a large-diameter telephoto lens in which various aberrations are satisfactorily corrected while achieving small size and light weight.
以下、本発明の実施形態について説明する。尚、ｇ線（波長４３５．８ｎｍ）、Ｆ線（波長４８６．１ｎｍ）、ｄ線（波長５８７．６ｎｍ）、及びＣ線（波長６５６．３ｎｍ）に対する屈折率を、それぞれｎｇ、ｎＦ、ｎｄ、ｎＣとした時、アッベ数νｄ、及び部分分散比θｇＦは以下の式で表される。
νｄ＝（ｎｄ−１）／（ｎＦ−ｎＣ）
θｇＦ＝（ｎｇ−ｎＦ）／（ｎＦ−ｎＣ）
Hereinafter, embodiments of the present invention will be described. The refractive indexes for g-line (wavelength 435.8 nm), F-line (wavelength 486.1 nm), d-line (wavelength 587.6 nm), and C-line (wavelength 656.3 nm) are ng, nF, nd, respectively. When nC, the Abbe number νd and the partial dispersion ratio θgF are expressed by the following equations.
νd = (nd-1) / (nF-nC)
θgF = (ng-nF) / (nF-nC)
本発明の結像光学系は、図１、７、１３、１９、２５に示すレンズ構成図からわかるように、物体側から像側へ順に、正の屈折力の第１レンズ群Ｇ１、負の屈折力の第２レンズ群Ｇ２、正の屈折力の第３レンズ群Ｇ３からなり、前記第２レンズ群Ｇ２を光軸に沿って移動させることによりフォーカシングを行い、前記第３レンズ群Ｇ３の少なくとも一部を光軸に対して垂直方向成分を含んで移動させることにより防振を行い、以下に示す条件式を満足することを特徴とする。
（１）ｆ１／ｆ＞０．６１
（２）−０．６６＜ｆ２／ｆ＜−０．４
（３）β２＜４．２
但し、
ｆ：無限遠合焦時の前記結像光学系全系の焦点距離
ｆ１：第１レンズ群Ｇ１の焦点距離
ｆ２：第２レンズ群Ｇ２の焦点距離
β２：無限遠合焦時の第２レンズ群Ｇ２の横倍率
In the imaging optical system of the present invention, as can be seen from the lens configuration diagrams shown in FIGS. 1, 7, 13, 19 and 25, the first lens group G1 having a positive refractive power and the negative lens group G1 have a positive refractive power in order from the object side to the image side. It is composed of a second lens group G2 having a refractive power and a third lens group G3 having a positive refractive power, and focusing is performed by moving the second lens group G2 along the optical axis, and at least the third lens group G3. It is characterized in that vibration isolation is performed by moving a part of the lens including a component in the direction perpendicular to the optical axis, and the following conditional expression is satisfied.
(1) f1 / f> 0.61
(2) -0.66 <f2 / f <-0.4
(3) β2 <4.2
However,
f: Focal length of the entire imaging optical system during infinity focusing f1: Focal length of the first lens group G1 f2: Focal length of the second lens group G2 β2: Second lens group during infinity focusing Horizontal magnification of G2
前記結像光学系において、レンズ径と重量の大きい前記第１レンズ群Ｇ１をフォーカシングに際し固定し、第１レンズ群Ｇ１で収斂された光束が入射するため、第１レンズ群Ｇ１に対して径と重量が小さい第２レンズ群Ｇ２を光軸に沿って移動させることで、フォーカシングの高速化が可能となる。また、防振レンズ群を有する第３レンズ群Ｇ３には、第１レンズ群Ｇ１および第２レンズ群Ｇ２を通過して収斂された光束が入射するため、防振レンズ群の径と重量を抑えることが可能となる。 In the imaging optical system, the first lens group G1 having a large lens diameter and weight is fixed at the time of focusing, and the light beam converged by the first lens group G1 is incident, so that the diameter is set with respect to the first lens group G1. By moving the second lens group G2, which has a small weight, along the optical axis, it is possible to increase the speed of focusing. Further, since the light flux that has passed through the first lens group G1 and the second lens group G2 is incident on the third lens group G3 having the anti-vibration lens group, the diameter and weight of the anti-vibration lens group are suppressed. It becomes possible.
一般に望遠レンズの小型化は光学系をテレフォトタイプにする、すなわち物体側から順に正の屈折力の第１レンズ群、負の屈折力の第２レンズ群で構成し、第１レンズ群の像を第２レンズ群で増倍させることにより全系の焦点距離に対し光学系全長の短縮を可能にした。この作用は各々の群の屈折力を大きくするほど全長短縮効果があがるが、副作用として各群の残存収差が増大し、大口径化、製造誤差敏感度の低減が困難になる。 In general, miniaturization of a telephoto lens makes the optical system a telephoto type, that is, it is composed of a first lens group having a positive refractive power and a second lens group having a negative refractive power in order from the object side, and an image of the first lens group. In the second lens group, the total length of the optical system can be shortened with respect to the focal length of the entire system. This action increases the effect of shortening the total length as the refractive power of each group is increased, but as a side effect, the residual aberration of each group increases, and it becomes difficult to increase the diameter and reduce the sensitivity to manufacturing error.
本願発明はこの課題に際し、通常の短縮化とは異なる手法を用いている。第１レンズ群Ｇ１の屈折力を小さくすることにより第１レンズ群Ｇ１での残存収差を抑制し、第２レンズ群Ｇ２の屈折力および横倍率を小さくすることにより第２レンズ群Ｇ２での残存収差を抑制しながら第１レンズ群Ｇ１での残存収差の拡大を抑えることで、大口径比を持ちながら、無限遠物体から近距離物体までの広範囲の物体距離において高い光学性能を達成することが可能となる。また、各群の屈折力を小さくすることで、各群の軸上厚を小さくすることができ、各群の屈折力を大きくすることなく、全長の短縮化が可能となる。さらに、各群を構成する各光学素子の重量が軽減されるため、光学径全体の軽量化が可能となる。その第１レンズ群Ｇ１および第２レンズ群Ｇ２の屈折力、第２レンズ群の横倍率について規定したのが上記の条件式（１）、（２）、（３）である。 In this subject, the invention of the present application uses a method different from the usual shortening. Remaining aberration in the first lens group G1 is suppressed by reducing the refractive power of the first lens group G1, and residual aberration in the second lens group G2 is suppressed by reducing the refractive power and lateral magnification of the second lens group G2. By suppressing the expansion of residual aberration in the first lens group G1 while suppressing the aberration, it is possible to achieve high optical performance over a wide range of object distances from infinity objects to short-range objects while having a large aperture ratio. It will be possible. Further, by reducing the refractive power of each group, the axial thickness of each group can be reduced, and the total length can be shortened without increasing the refractive power of each group. Further, since the weight of each optical element constituting each group is reduced, the weight of the entire optical diameter can be reduced. The above conditional expressions (1), (2), and (3) define the refractive power of the first lens group G1 and the second lens group G2 and the lateral magnification of the second lens group.
条件式（１）の下限値を超えて第１レンズ群Ｇ１の正の屈折力が強くなり過ぎると、第１レンズ群Ｇ１で発生する球面収差や非点収差の残存量が大きくなり、その補正が困難になるため、大口径化出来ない。また、各光学素子の小径化には有利になるが、各光学素子の曲率が大きくなるため、軸上厚が厚くなり、小型軽量化の作用が効果的でなくなる。 If the positive refractive power of the first lens group G1 becomes too strong beyond the lower limit of the conditional expression (1), the residual amount of spherical aberration and astigmatism generated in the first lens group G1 becomes large, and the correction thereof. It becomes difficult to increase the diameter. Further, although it is advantageous for reducing the diameter of each optical element, since the curvature of each optical element becomes large, the axial thickness becomes thick, and the action of reducing the size and weight becomes ineffective.
尚、条件式（１）について、望ましくはその下限値を０．６３に限定することで、前述の効果をより確実にすることができる。 By limiting the lower limit of the conditional expression (1) to 0.63, the above-mentioned effect can be further ensured.
条件式（２）の上限値を超えて第２レンズ群Ｇ２の負の屈折力が強くなり過ぎると、フォーカシングにおける第２レンズ群Ｇ２の移動量を抑えるには有利になるが、第２レンズ群Ｇ２で発生する球面収差や非点収差の量が大きくなり、フォーカシングに伴う収差変動が大きくなる。一方、条件式（２）の下限値を超えて第２レンズ群Ｇ２の負の屈折力が弱くなり過ぎると、フォーカシング時の第２レンズ群Ｇ２の移動量が大きくなり、光学系全系の小型化が困難になる。 If the negative refractive power of the second lens group G2 becomes too strong beyond the upper limit of the conditional expression (2), it is advantageous to suppress the amount of movement of the second lens group G2 in focusing, but the second lens group The amount of spherical aberration and astigmatism generated in G2 becomes large, and the aberration fluctuation accompanying focusing becomes large. On the other hand, if the negative refractive power of the second lens group G2 becomes too weak beyond the lower limit of the conditional expression (2), the amount of movement of the second lens group G2 during focusing becomes large, and the entire optical system becomes compact. It becomes difficult to change.
尚、条件式（２）について、望ましくはその下限値を−０．６０に、また上限値を−０．４１５に限定することで、前述の効果をより確実にすることができる。 Regarding the conditional expression (2), preferably, the lower limit value is limited to −0.60 and the upper limit value is limited to −0.415, so that the above-mentioned effect can be further ensured.
条件式（３）の上限値を超えて第２レンズ群Ｇ２の横倍率が大きくなると、第１レンズ群Ｇ１での残存収差の拡大量が増え、その補正が困難になる。 If the lateral magnification of the second lens group G2 exceeds the upper limit of the conditional expression (3), the amount of enlargement of the residual aberration in the first lens group G1 increases, and it becomes difficult to correct it.
尚、条件式（３）について、望ましくはその上限値を４．０に限定することで、前述の効果をより確実にすることができる。 By limiting the upper limit of the conditional expression (3) to 4.0, the above-mentioned effect can be further ensured.
さらに、本発明の結像光学系では、以下に示す条件式を満足することが望ましい。
（４）νｄｐ１ｆ＞６０
（５）θｇＦｐ１ｆ−０．６４８３＋０．００１８×νｄｐ１ｆ＞０．００１
但し、
νｄｐ１ｆ：前記結像光学系のうち最も物体側に位置する正レンズの、ｄ線に関するアッベ数
θｇＦｐ１ｆ：前記結像光学系のうち最も物体側に位置する正レンズの、ｇ線とＦ線に関する部分分散比
Further, in the imaging optical system of the present invention, it is desirable that the conditional expression shown below is satisfied.
(4) νdp1f> 60
(5) θgFp1f-0.6483 + 0.0018 × νdp1f> 0.001
However,
νdp1f: Abbe number related to d-line of the positive lens located closest to the object side in the imaging optical system θgFp1f: Part related to g-line and F-line of the positive lens located closest to the object side in the imaging optical system Dispersion ratio
条件式（４）および条件式（５）は、前記結像光学系のうち最も物体側に位置する正レンズの材料について、軸上色収差、倍率色収差を良好に補正するために好ましい光学特性を規定するものである。正の異常部分分散性を持つ低分散の光学材料を、最も物体側に位置する正レンズの材料として用いることで、当該正レンズでの２次スペクトルを含めた色収差発生を抑え、光学系全体での２次スペクトルを含めた色収差を抑制している。 The conditional expression (4) and the conditional expression (5) define preferable optical characteristics for satisfactorily correcting axial chromatic aberration and chromatic aberration of magnification with respect to the material of the positive lens located closest to the object side in the imaging optical system. It is something to do. By using a low-dispersion optical material with positive anomalous partial dispersibility as the material for the positive lens located closest to the object, chromatic aberration including the secondary spectrum of the positive lens can be suppressed, and the entire optical system can be used. Chromatic aberration including the second-order spectrum of is suppressed.
条件式（４）の下限値を超えて前記結像光学系のうち最も物体側に位置する正レンズのアッベ数が小さくなると、当該正レンズで発生する色収差が大きくなり、軸上色収差、倍率色収差の補正が困難となる。 When the lower limit of the conditional expression (4) is exceeded and the Abbe number of the positive lens located closest to the object side in the imaging optical system becomes small, the chromatic aberration generated by the positive lens becomes large, and axial chromatic aberration and magnification chromatic aberration become large. Is difficult to correct.
尚、条件式（４）について、望ましくはその下限値を６５に限定することで、前述の効果をより確実にすることができる。 By limiting the lower limit of the conditional expression (4) to 65, the above-mentioned effect can be further ensured.
条件式（５）の下限値を超えて前記結像光学系のうち最も物体側に位置する正レンズの正の異常部分分散性が小さくなると、当該正レンズで発生する２次スペクトルを含めた色収差が大きくなり、色収差、特に２次スペクトルの補正が困難になる。 When the lower limit of the conditional expression (5) is exceeded and the positive anomalous partial dispersibility of the positive lens located closest to the object side of the imaging optical system becomes small, the chromatic aberration including the secondary spectrum generated by the positive lens becomes small. Becomes large, and it becomes difficult to correct chromatic aberration, especially the second-order spectrum.
尚、条件式（５）について、望ましくはその下限値を０．００５に限定することで、前述の効果をより確実にすることができる。 The above-mentioned effect can be further ensured by limiting the lower limit of the conditional expression (5) to 0.005.
さらに、本発明の結像光学系では、前記第２レンズ群Ｇ２が少なくとも１枚の正レンズと、複数の負レンズとを有することが望ましい。この構成により、フォーカス時における色収差、球面収差、非点収差等の諸収差の変動を十分に抑制することが可能となる。さらに、以下に示す条件式を満足することが望ましい。
（６）θｇＦｐ２−０．６４８３＋０．００１８×νｄｐ２＞０．０１
（７）θｇＦｎ２−０．６４８３＋０．００１８×νｄｎ２＜−０．００１
但し、
νｄｐ２：前記第２レンズ群Ｇ２が有する正レンズうち、少なくとも１枚のｄ線に関するアッベ数
θｇＦｐ２：前記第２レンズ群Ｇ２が有する正レンズうち、少なくとも１枚のｇ線とＦ線に関する部分分散比
νｄｎ２：前記第２レンズ群Ｇ２が有する負レンズのうち、少なくとも１枚のｄ線に関するアッベ数
θｇＦｎ２：前記第２レンズ群Ｇ２が有する負レンズのうち、少なくとも１枚のｇ線とＦ線に関する部分分散比
Further, in the imaging optical system of the present invention, it is desirable that the second lens group G2 has at least one positive lens and a plurality of negative lenses. With this configuration, it is possible to sufficiently suppress fluctuations in various aberrations such as chromatic aberration, spherical aberration, and astigmatism during focusing. Furthermore, it is desirable to satisfy the conditional expression shown below.
(6) θgFp2-0.6483 + 0.0018 × νdp2> 0.01
(7) θgFn2-0.6483 + 0.0018 × νdn2 <-0.001
However,
νdp2: Abbe number θgFp2 for at least one d-line of the positive lenses of the second lens group G2: partial dispersion ratio of at least one g-line and F-line of the positive lenses of the second lens group G2. νdn2: Abbe number θgFn2 for at least one d-line among the negative lenses of the second lens group G2: a portion related to at least one g-line and F-line among the negative lenses of the second lens group G2. Dispersion ratio
条件式（６）、（７）は、第２レンズ群Ｇ２に含まれる正レンズおよび負レンズの材料について２次スペクトルを含めて軸上色収差、倍率色収差を良好に補正するために好ましい光学特性を規定するものである。第２レンズ群Ｇ２が正の異常部分分散性の材料の正レンズと、正レンズよりも異常部分分散性の低い材料の負レンズを有することで、第２レンズ群Ｇ２内で発生する２次スペクトルを含めた色収差を抑制している。 The conditional expressions (6) and (7) provide preferable optical characteristics for the materials of the positive lens and the negative lens included in the second lens group G2 in order to satisfactorily correct axial chromatic aberration and chromatic aberration of magnification, including the secondary spectrum. It regulates. The second lens group G2 has a positive lens made of a positive abnormal partial dispersion material and a negative lens made of a material having a lower abnormal partial dispersion than the positive lens, so that the secondary spectrum generated in the second lens group G2 Chromatic aberration including the lens is suppressed.
条件式（６）の下限値を超えて正レンズの異常部分分散性が小さくなると、正レンズと負レンズの部分分散比の差を小さくすることが出来ず、色収差、特に２次スペクトルの補正が困難になる。 If the abnormal partial dispersion of the positive lens becomes smaller than the lower limit of the conditional expression (6), the difference in the partial dispersion ratio between the positive lens and the negative lens cannot be reduced, and chromatic aberration, especially the secondary spectrum, is corrected. It will be difficult.
尚、条件式（６）について、望ましくはその下限値を０．０１５に限定することで、前述の効果をより確実にすることができる。 By limiting the lower limit of the conditional expression (6) to 0.015, the above-mentioned effect can be further ensured.
条件式（７）の上限値を超えて負レンズの異常部分分散性が大きくなると、正レンズと負レンズの部分分散比の差を小さくすることが出来ず、色収差、特に２次スペクトルの補正が困難になる。 If the abnormal partial dispersibility of the negative lens increases beyond the upper limit of the conditional expression (7), the difference in the partial dispersion ratio between the positive lens and the negative lens cannot be reduced, and chromatic aberration, especially the secondary spectrum, is corrected. It will be difficult.
尚、条件式（７）について、望ましくはその上限値を−０．００３に限定することで、前述の効果をより確実にすることができる。 By limiting the upper limit of the conditional expression (7) to −0.003, the above-mentioned effect can be further ensured.
さらに、本発明の結像光学系では、以下に示す条件式を満足することが望ましい。
（８）０．０２＜Ｌ１Ａ１Ｂ／Ｌ＜０．２
但し、
Ｌ：前記結像光学系のうち、最も物体側のレンズ面から像面までの距離
Ｌ１Ａ１Ｂ：前記第１レンズ群Ｇ１における最大空気間隔
Further, in the imaging optical system of the present invention, it is desirable that the conditional expression shown below is satisfied.
(8) 0.02 <L1A1B / L <0.2
However,
L: Distance from the lens surface to the image surface on the object side of the imaging optical system L1A1B: Maximum air spacing in the first lens group G1
条件式（８）は第１レンズ群Ｇ１内の空気間隔について、前記結像光学系全体での重量を抑えるため、第１レンズ群Ｇ１内の空気間隔のうち最も広い空気間隔を規定するものである。 Conditional expression (8) defines the widest air spacing in the first lens group G1 in order to reduce the weight of the entire imaging optical system with respect to the air spacing in the first lens group G1. is there.
条件式（８）の下限値を超えて第１レンズ群Ｇ１内の最も広い空気間隔が小さくなると、第１Ａレンズ群Ｇ１Ａを通過した光束が十分に収斂されない状態で第１Ｂレンズ群Ｇ１Ｂに入射するため、第１Ｂレンズ群Ｇ１Ｂの径が肥大化し、全体での重量が増加する。一方、条件式（８）の上限値を超えて第１レンズ群Ｇ１内の最も広い空気間隔が大きくなると、第１Ａレンズ群Ｇ１Ａを通過した光束が十分に収斂された状態で第１Ｂレンズ群Ｇ１Ｂに入射するため、第１Ｂレンズ群Ｇ１Ｂの径が抑制されるが、十分な周辺光量の確保のためには、第１Ａレンズ群Ｇ１Ａの径を拡大することが必要となり、全体の重量が増加する。 When the widest air spacing in the first lens group G1 becomes smaller than the lower limit of the conditional expression (8), the light flux passing through the first A lens group G1A is incident on the first B lens group G1B in a state where it is not sufficiently converged. Therefore, the diameter of the first B lens group G1B is enlarged, and the total weight is increased. On the other hand, when the widest air spacing in the first lens group G1 becomes larger than the upper limit of the conditional expression (8), the light flux passing through the first A lens group G1A is sufficiently converged and the first B lens group G1B However, the diameter of the first B lens group G1B is suppressed, but it is necessary to increase the diameter of the first A lens group G1A in order to secure a sufficient amount of peripheral light, and the total weight increases. ..
尚、条件式（８）について、望ましくはその下限値を０．０４に、また上限値を０．１に限定することで、前述の効果をより確実にすることができる。 By limiting the lower limit value of the conditional expression (8) to 0.04 and the upper limit value to 0.1, the above-mentioned effect can be further ensured.
さらに、本発明の結像光学系では、前記第１Ａレンズ群Ｇ１Ａは、２枚の正レンズを有することが望ましい。２枚の正レンズを有することにより、屈折力を大きくしながら、第１Ａレンズ群Ｇ１Ａ内で発生する球面収差をはじめとする諸収差をより良好に補正することが可能となる。第１Ａレンズ群Ｇ１Ａでの屈折力を大きくすることで、第１Ａレンズ群Ｇ１Ａでの光線の収斂効果を高め、第１Ｂレンズ群Ｇ１Ｂに入射する光束の径を小さくすることができ、第１Ｂレンズ群Ｇ１Ｂの小径化および軽量化が可能となる。さらに、以下に示す条件式を満足することが望ましい。
（９）νｄｐ１Ａ＞６０
（１０）θｇＦｐ１Ａ−０．６４８３＋０．００１８×νｄｐ１Ａ＞０．００１
但し、
νｄｐ１Ａ：第１Ａレンズ群Ｇ１Ａが有する正レンズのうち、ｄ線に関するアッベ数が最も小さい正レンズのｄ線に関するアッベ数
θｇＦｐ１Ａ：第１Ａレンズ群Ｇ１Ａが有する正レンズのうち、ｄ線に関するアッベ数が最も小さい正レンズのｇ線とＦ線に関する部分分散比
Further, in the imaging optical system of the present invention, it is desirable that the first A lens group G1A has two positive lenses. By having two positive lenses, it is possible to better correct various aberrations such as spherical aberration generated in the first A lens group G1A while increasing the refractive power. By increasing the refractive power in the first A lens group G1A, the effect of converging light rays in the first A lens group G1A can be enhanced, and the diameter of the light flux incident on the first B lens group G1B can be reduced, and the diameter of the light beam incident on the first B lens group G1B can be reduced. The diameter and weight of the group G1B can be reduced. Furthermore, it is desirable to satisfy the conditional expression shown below.
(9) νdp1A> 60
(10) θgFp1A-0.6483 + 0.0018 × νdp1A> 0.001
However,
νdp1A: Abbe number for the d-line of the positive lens having the smallest Abbe number for the d-line among the positive lenses of the first A lens group G1A θgFp1A: Abbe number for the d-line among the positive lenses of the first A lens group G1A Partial dispersion ratio for g-line and F-line of the smallest positive lens
条件式（９）および条件式（１０）は、第１Ａレンズ群Ｇ１Ａが有する正レンズの材料について、軸上色収差、倍率色収差を良好に補正するために好ましい光学特性を規定するものである。正の異常部分分散性を持つ低分散の光学材料を、第１Ａレンズ群Ｇ１Ａが有する正レンズの材料として用いることで、第１Ａレンズ群Ｇ１Ａでの２次スペクトルを含めた色収差発生を抑え、光学系全体での２次スペクトルを含めた色収差を抑制している。 The conditional expression (9) and the conditional expression (10) define preferable optical characteristics for the material of the positive lens included in the first A lens group G1A in order to satisfactorily correct axial chromatic aberration and lateral chromatic aberration. By using a low-dispersion optical material having positive anomalous partial dispersibility as the material of the positive lens of the first A lens group G1A, the occurrence of chromatic aberration including the secondary spectrum in the first A lens group G1A is suppressed and the optics Chromatic aberration including the second-order spectrum of the entire system is suppressed.
条件式（９）の下限値を超えて第１Ａレンズ群Ｇ１Ａが有する正レンズのアッベ数が小さくなると、第１Ａレンズ群Ｇ１Ａで発生する色収差が大きくなり、軸上色収差、倍率色収差の補正が困難となる。 When the Abbe number of the positive lens of the first A lens group G1A becomes smaller than the lower limit of the conditional expression (9), the chromatic aberration generated in the first A lens group G1A becomes large, and it is difficult to correct the axial chromatic aberration and the chromatic aberration of magnification. It becomes.
尚、条件式（９）について、望ましくはその下限値を６５に限定することで、前述の効果をより確実にすることができる。 By limiting the lower limit of the conditional expression (9) to 65, the above-mentioned effect can be further ensured.
条件式（１０）の下限値を超えて第１Ａレンズ群Ｇ１Ａが有する正レンズの正の異常部分分散性が小さくなると、第１Ａレンズ群Ｇ１Ａで発生する２次スペクトルを含めた色収差が大きくなり、色収差、特に２次スペクトルの補正が困難になる。 When the lower limit of the conditional expression (10) is exceeded and the positive anomalous partial dispersibility of the positive lens of the first A lens group G1A becomes smaller, the chromatic aberration including the secondary spectrum generated in the first A lens group G1A becomes large. It becomes difficult to correct chromatic aberration, especially the second-order spectrum.
尚、条件式（１０）について、望ましくはその下限値を０．００５に限定することで、前述の効果をより確実にすることができる。 The above-mentioned effect can be further ensured by limiting the lower limit of the conditional expression (10) to 0.005.
さらに、本発明の結像光学系では、前記第３レンズ群Ｇ３は、物体側から順に正の屈折力を有する第３Ａレンズ群Ｇ３Ａと、負の屈折力を有する第３Ｂレンズ群Ｇ３Ｂと、正の屈折力を有する第３Ｃレンズ群Ｇ３Ｃからなり、前記第３Ｂレンズ群Ｇ３Ｂを光軸に対して垂直方向成分を含んで移動させることにより防振を行うことが望ましい。正の屈折力の第３Ａレンズ群Ｇ３Ａにより光線を収斂することで、防振時に移動する第３Ｂレンズ群Ｇ３Ｂのレンズ径を小さくすることを可能にしている。さらに正の屈折力の第３Ｃレンズ群Ｇ３Ｃを配置することにより、光学系全系の焦点距離を保ちつつ第３Ｂレンズ群Ｇ３Ｂの負の屈折力を増大させることが可能となり、第３Ｂレンズ群Ｇ３Ｂの防振係数を大きくして、少ない移動量で防振を行うことができる。 Further, in the imaging optical system of the present invention, the third lens group G3 has a third A lens group G3A having a positive refractive power and a third B lens group G3B having a negative refractive power in order from the object side. It is desirable to perform vibration isolation by moving the third B lens group G3B including the component in the direction perpendicular to the optical axis, which is composed of the third C lens group G3C having the refractive power of. By converging light rays with the third A lens group G3A having a positive refractive power, it is possible to reduce the lens diameter of the third B lens group G3B that moves during vibration isolation. Furthermore, by arranging the third C lens group G3C having a positive refractive power, it is possible to increase the negative refractive power of the third B lens group G3B while maintaining the focal length of the entire optical system, and the third B lens group G3B. The vibration isolation coefficient can be increased to perform vibration isolation with a small amount of movement.
さらに、本発明の結像光学系では、前記第３Ａレンズ群Ｇ３Ａは、少なくとも１枚の正レンズと、少なくとも１枚の負レンズを有し、以下に示す条件式を満足することが望ましい。低分散かつ正の異常部分分散性をもつ材料の正レンズと、負レンズを有することで、第３Ａレンズ群Ｇ３Ａ内で発生する２次スペクトルを含めた色収差を抑制している。
（１１）νｄｐ３＞６０
（１２）θｇＦｐ３−０．６４８３＋０．００１８×νｄｐ３＞０．００５
νｄｐ３：前記第３レンズ群Ｇ３が有する少なくとも１枚の正レンズの、ｄ線に関するアッベ数
θｇＦｐ３：前記第３レンズ群Ｇ３が有する少なくとも１枚の正レンズの、ｇ線とＦ線に関する部分分散比
Further, in the imaging optical system of the present invention, it is desirable that the third A lens group G3A has at least one positive lens and at least one negative lens, and satisfies the conditional expression shown below. By having a positive lens and a negative lens made of a material having low dispersion and positive anomalous partial dispersibility, chromatic aberration including a secondary spectrum generated in the third A lens group G3A is suppressed.
(11) νdp3> 60
(12) θgFp3-0.6483 + 0.0018 × νdp3> 0.005
νdp3: Abbe number θgFp3 with respect to d-line of at least one positive lens of the third lens group G3: partial dispersion ratio of at least one positive lens of the third lens group G3 with respect to g-line and F-line.
条件式（１１）、（１２）は、第３Ａレンズ群Ｇ３Ａに含まれる正レンズの材料について、２次スペクトルを含めて軸上色収差、倍率色収差を良好に補正するために好ましい光学特性を規定するものである。第３Ａレンズ群Ｇ３Ａが低分散かつ正の異常部分分散性が大きい材料の正レンズを有することで、第１レンズ群Ｇ１および第２レンズ群Ｇ２で補正不足となった色収差を補正している。 The conditional expressions (11) and (12) define preferable optical characteristics for the material of the positive lens included in the third A lens group G3A in order to satisfactorily correct axial chromatic aberration and lateral chromatic aberration including the secondary spectrum. It is a thing. Since the third A lens group G3A has a positive lens made of a material having low dispersion and a large positive abnormal partial dispersibility, chromatic aberration that is insufficiently corrected in the first lens group G1 and the second lens group G2 is corrected.
条件式（１１）の下限値を超えて第３Ａレンズ群Ｇ３Ａうち、少なくとも１枚の正レンズのアッベ数が小さくなると、第３Ａレンズ群Ｇ３Ａで発生する色収差が大きくなり、軸上色収差の補正が困難となる。 When the lower limit of the conditional expression (11) is exceeded and the Abbe number of at least one positive lens in the third A lens group G3A becomes smaller, the chromatic aberration generated in the third A lens group G3A becomes larger, and the axial chromatic aberration is corrected. It will be difficult.
尚、条件式（１１）について、望ましくはその下限値を６５に限定することで、前述の効果をより確実にすることができる。 By limiting the lower limit of the conditional expression (11) to 65, the above-mentioned effect can be further ensured.
条件式（１２）の下限値を超えて第３Ａレンズ群Ｇ３Ａうち、少なくとも１枚の正レンズ正の異常部分分散性が小さくなると、第３Ａレンズ群Ｇ３Ａで発生する２次スペクトルを含めた色収差が大きくなり、軸上色収差、特に２次スペクトルの補正が困難になる。 When the lower limit of the conditional expression (12) is exceeded and the anomalous partial dispersibility of at least one positive lens of the third A lens group G3A becomes smaller, the chromatic aberration including the secondary spectrum generated in the third A lens group G3A becomes large. As the size increases, it becomes difficult to correct axial chromatic aberration, especially the second-order spectrum.
尚、条件式（１２）について、望ましくはその下限値を０．００８に限定することで、前述の効果をより確実にすることができる。 By limiting the lower limit of the conditional expression (12) to 0.008, the above-mentioned effect can be further ensured.
本発明の結像光学系では、以下の構成を伴うことがより効果的である。第１Ｂレンズ群Ｇ１Ｂは、正レンズと負レンズとが貼り合わされた接合レンズを有することが望ましい。これにより、１Ｂ群レンズ内での製造誤差敏感度を低減することが可能となる。また、第３レンズ群Ｇ３内の防振レンズ群は、１枚の正レンズと２枚の負レンズから構成されることが望ましい。この構成により、防振群の重量増加を抑えながら、高い防振係数を実現し、防振時における、色収差、コマ収差、非点収差等の諸収差の変動を十分に抑制することが可能となる。 In the imaging optical system of the present invention, it is more effective to include the following configurations. It is desirable that the first B lens group G1B has a bonded lens in which a positive lens and a negative lens are bonded together. This makes it possible to reduce the sensitivity to manufacturing errors in the 1B group lens. Further, it is desirable that the anti-vibration lens group in the third lens group G3 is composed of one positive lens and two negative lenses. With this configuration, it is possible to realize a high vibration isolation coefficient while suppressing the weight increase of the vibration isolation group, and to sufficiently suppress fluctuations in various aberrations such as chromatic aberration, coma aberration, and astigmatism during vibration isolation. Become.
次に、本発明の結像光学系に係る実施例のレンズ構成について説明する。なお、以下の説明ではレンズ構成を物体側から像側の順番で記載する。 Next, the lens configuration of the embodiment according to the imaging optical system of the present invention will be described. In the following description, the lens configuration will be described in order from the object side to the image side.
図１は、本発明の実施例１の結像光学系のレンズ構成図である。物体側から像側へ順に、正の屈折力の第１レンズ群Ｇ１と、負の屈折力の第２レンズ群Ｇ２と、正の屈折力の第３レンズ群Ｇ３から構成される。 FIG. 1 is a lens configuration diagram of an imaging optical system according to a first embodiment of the present invention. From the object side to the image side, it is composed of a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a positive refractive power.
第１レンズ群Ｇ１は、正の屈折力の第１Ａレンズ群Ｇ１Ａと負の屈折力の第１Ｂレンズ群Ｇ１Ｂから構成される。第１Ａレンズ群Ｇ１Ａは、両凸形状の正レンズＬ１と、物体側に凸面を向けた正メニスカスレンズＬ２から構成される。第１Ｂレンズ群Ｇ１Ｂは、両凸形状の正レンズＬ３と両凹形状の負レンズＬ４との２枚のレンズからなる接合レンズと、物体側に凸面を向けた正メニスカスレンズＬ５と像面側に凹面を向けた負メニスカスレンズＬ６の２枚のレンズからなる接合レンズから構成される。 The first lens group G1 is composed of a first A lens group G1A having a positive refractive power and a first B lens group G1B having a negative refractive power. The first A lens group G1A is composed of a biconvex positive lens L1 and a positive meniscus lens L2 with a convex surface facing the object side. The first B lens group G1B consists of a junction lens consisting of two lenses, a biconvex positive lens L3 and a biconcave negative lens L4, a positive meniscus lens L5 with a convex surface facing the object side, and an image plane side. It is composed of a junction lens consisting of two lenses of a negative meniscus lens L6 with a concave surface facing.
第２レンズ群Ｇ２は、両凸形状の正レンズＬ７と両凹形状の負レンズＬ８との２枚のレンズからなる接合レンズと、両凹形状の負レンズＬ９から構成され、第２レンズ群Ｇ２を光軸に沿って像面側へ移動させることにより無限遠物体から近距離物体へのフォーカシングを行っている。開口絞りＳは第２レンズ群Ｇ２と第３レンズ群Ｇ３の間に配置されている。 The second lens group G2 is composed of a junction lens consisting of two lenses, a biconvex positive lens L7 and a biconcave negative lens L8, and a biconcave negative lens L9, and is composed of a biconcave negative lens L9. Is focused from an infinity object to a short-range object by moving the lens toward the image plane along the optical axis. The aperture diaphragm S is arranged between the second lens group G2 and the third lens group G3.
第３レンズ群Ｇ３は、正の屈折力の第３Ａレンズ群Ｇ３Ａ、負の屈折力の第３Ｂレンズ群Ｇ３Ｂ、正の屈折力の第３Ｃレンズ群Ｇ３Ｃの３つの群から構成され、第３Ｂレンズ群Ｇ３Ｂを光軸に対して垂直方向成分を含んで移動させることにより防振を行っている。第３Ａレンズ群Ｇ３Ａは、像面側に凹面を向けた負メニスカスレンズＬ１０と両凸形状の正レンズＬ１１との２枚のレンズからなる接合レンズと、物体側に凸面を向けた正メニスカスレンズＬ１２から構成される。第３Ｂレンズ群Ｇ３Ｂは、像面側に凸面を向けた正メニスカスレンズＬ１３と両凹形状の負レンズＬ１４との２枚のレンズからなる接合レンズと、両凹形状の負レンズＬ１５から構成される。第３Ｃレンズ群Ｇ３Ｃは、両凸形状の正レンズＬ１６と、物体側に凸面を向けた正メニスカスレンズＬ１７と、両凹形状の負レンズＬ１８と両凸形状の正レンズＬ１９との２枚のレンズからなる接合レンズから構成される。 The third lens group G3 is composed of three groups: a third A lens group G3A having a positive refractive power, a third B lens group G3B having a negative refractive power, and a third C lens group G3C having a positive refractive power. Vibration isolation is performed by moving the group G3B including a component in the direction perpendicular to the optical axis. The third A lens group G3A is a junction lens composed of two lenses, a negative meniscus lens L10 having a concave surface facing the image plane side and a biconvex positive lens L11, and a positive meniscus lens L12 having a convex surface facing the object side. Consists of. The third B lens group G3B is composed of a junction lens consisting of two lenses, a positive meniscus lens L13 having a convex surface facing the image plane side and a biconcave negative lens L14, and a biconcave negative lens L15. .. The third C lens group G3C consists of two lenses: a biconvex positive lens L16, a positive meniscus lens L17 with a convex surface facing the object side, a biconcave negative lens L18, and a biconvex positive lens L19. It is composed of a junction lens consisting of.
図７は、本発明の実施例２の結像光学系のレンズ構成図である。物体側から像側へ順に、正の屈折力の第１レンズ群Ｇ１と、負の屈折力の第２レンズ群Ｇ２と、正の屈折力の第３レンズ群Ｇ３から構成される。 FIG. 7 is a lens configuration diagram of the imaging optical system according to the second embodiment of the present invention. From the object side to the image side, it is composed of a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a positive refractive power.
第１レンズ群Ｇ１は、正の屈折力の第１Ａレンズ群Ｇ１Ａと負の屈折力の第１Ｂレンズ群Ｇ１Ｂから構成される。第１Ａレンズ群Ｇ１Ａは、両凸形状の正レンズＬ１と、物体側に凸面を向けた正メニスカスレンズＬ２から構成される。第１Ｂレンズ群Ｇ１Ｂは、両凸形状の正レンズＬ３と両凹形状の負レンズＬ４との２枚のレンズからなる接合レンズと、物体側に凸面を向けた正メニスカスレンズＬ５と像面側に凹面を向けた負メニスカスレンズＬ６の２枚のレンズからなる接合レンズから構成される。 The first lens group G1 is composed of a first A lens group G1A having a positive refractive power and a first B lens group G1B having a negative refractive power. The first A lens group G1A is composed of a biconvex positive lens L1 and a positive meniscus lens L2 with a convex surface facing the object side. The first B lens group G1B consists of a junction lens consisting of two lenses, a biconvex positive lens L3 and a biconcave negative lens L4, a positive meniscus lens L5 with a convex surface facing the object side, and an image plane side. It is composed of a junction lens consisting of two lenses of a negative meniscus lens L6 with a concave surface facing.
第２レンズ群Ｇ２は、両凸形状の正レンズＬ７と両凹形状の負レンズＬ８との２枚のレンズからなる接合レンズと、両凹形状の負レンズＬ９から構成され、第２レンズ群Ｇ２を光軸に沿って像面側へ移動させることにより無限遠物体から近距離物体へのフォーカシングを行っている。開口絞りＳは第２レンズ群Ｇ２と第３レンズ群Ｇ３の間に配置されている。 The second lens group G2 is composed of a junction lens consisting of two lenses, a biconvex positive lens L7 and a biconcave negative lens L8, and a biconcave negative lens L9, and is composed of a biconcave negative lens L9. Is focused from an infinity object to a short-range object by moving the lens toward the image plane along the optical axis. The aperture diaphragm S is arranged between the second lens group G2 and the third lens group G3.
第３レンズ群Ｇ３は、正の屈折力の第３Ａレンズ群Ｇ３Ａ、負の屈折力の第３Ｂレンズ群Ｇ３Ｂ、正の屈折力の第３Ｃレンズ群Ｇ３Ｃの３つの群から構成され、第３Ｂレンズ群Ｇ３Ｂを光軸に対して垂直方向成分を含んで移動させることにより防振を行っている。第３Ａレンズ群Ｇ３Ａは、像面側に凹面を向けた負メニスカスレンズＬ１０と両凸形状の正レンズＬ１１との２枚のレンズからなる接合レンズと、物体側に凸面を向けた正メニスカスレンズＬ１２から構成される。第３Ｂレンズ群Ｇ３Ｂは、像面側に凸面を向けた正メニスカスレンズＬ１３と両凹形状の負レンズＬ１４との２枚のレンズからなる接合レンズと、両凹形状の負レンズＬ１５から構成される。第３Ｃレンズ群Ｇ３Ｃは、両凸形状の正レンズＬ１６と、物体側に凸面を向けた正メニスカスレンズＬ１７と、両凹形状の負レンズＬ１８と両凸形状の正レンズＬ１９との２枚のレンズからなる接合レンズから構成される。 The third lens group G3 is composed of three groups: a third A lens group G3A having a positive refractive power, a third B lens group G3B having a negative refractive power, and a third C lens group G3C having a positive refractive power. Vibration isolation is performed by moving the group G3B including a component in the direction perpendicular to the optical axis. The third A lens group G3A is a junction lens composed of two lenses, a negative meniscus lens L10 having a concave surface facing the image plane side and a biconvex positive lens L11, and a positive meniscus lens L12 having a convex surface facing the object side. Consists of. The third B lens group G3B is composed of a junction lens consisting of two lenses, a positive meniscus lens L13 having a convex surface facing the image plane side and a biconcave negative lens L14, and a biconcave negative lens L15. .. The third C lens group G3C consists of two lenses: a biconvex positive lens L16, a positive meniscus lens L17 with a convex surface facing the object side, a biconcave negative lens L18, and a biconvex positive lens L19. It is composed of a junction lens consisting of.
図１３は、本発明の実施例３の結像光学系のレンズ構成図である。物体側から像側へ順に、正の屈折力の第１レンズ群Ｇ１と、負の屈折力の第２レンズ群Ｇ２と、正の屈折力の第３レンズ群Ｇ３から構成される。 FIG. 13 is a lens configuration diagram of the imaging optical system according to the third embodiment of the present invention. From the object side to the image side, it is composed of a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a positive refractive power.
第１レンズ群Ｇ１は、正の屈折力の第１Ａレンズ群Ｇ１Ａと負の屈折力の第１Ｂレンズ群Ｇ１Ｂから構成される。第１Ａレンズ群Ｇ１Ａは、両凸形状の正レンズＬ１と、物体側に凸面を向けた正メニスカスレンズＬ２から構成される。第１Ｂレンズ群Ｇ１Ｂは、両凸形状の正レンズＬ３と両凹形状の負レンズＬ４との２枚のレンズからなる接合レンズと、物体側に凸面を向けた正メニスカスレンズＬ５と像面側に凹面を向けた負メニスカスレンズＬ６の２枚のレンズからなる接合レンズから構成される。 The first lens group G1 is composed of a first A lens group G1A having a positive refractive power and a first B lens group G1B having a negative refractive power. The first A lens group G1A is composed of a biconvex positive lens L1 and a positive meniscus lens L2 with a convex surface facing the object side. The first B lens group G1B consists of a junction lens consisting of two lenses, a biconvex positive lens L3 and a biconcave negative lens L4, a positive meniscus lens L5 with a convex surface facing the object side, and an image plane side. It is composed of a junction lens consisting of two lenses of a negative meniscus lens L6 with a concave surface facing.
第２レンズ群Ｇ２は、両凸形状の正レンズＬ７と両凹形状の負レンズＬ８との２枚のレンズからなる接合レンズと、両凹形状の負レンズＬ９から構成され、第２レンズ群Ｇ２を光軸に沿って像面側へ移動させることにより無限遠物体から近距離物体へのフォーカシングを行っている。開口絞りＳは第２レンズ群Ｇ２と第３レンズ群Ｇ３の間に配置されている。 The second lens group G2 is composed of a junction lens consisting of two lenses, a biconvex positive lens L7 and a biconcave negative lens L8, and a biconcave negative lens L9, and is composed of a biconcave negative lens L9. Is focused from an infinity object to a short-range object by moving the lens toward the image plane along the optical axis. The aperture diaphragm S is arranged between the second lens group G2 and the third lens group G3.
第３レンズ群Ｇ３は、正の屈折力の第３Ａレンズ群Ｇ３Ａ、負の屈折力の第３Ｂレンズ群Ｇ３Ｂ、正の屈折力の第３Ｃレンズ群Ｇ３Ｃの３つの群から構成され、第３Ｂレンズ群Ｇ３Ｂを光軸に対して垂直方向成分を含んで移動させることにより防振を行っている。第３Ａレンズ群Ｇ３Ａは、両凹形状の負レンズＬ１０と両凸形状の正レンズＬ１１との２枚のレンズからなる接合レンズと、両凸形状の正レンズＬ１２から構成される。第３Ｂレンズ群Ｇ３Ｂは、両凸形状の正レンズＬ１３と両凹形状の負レンズＬ１４との２枚のレンズからなる接合レンズと、両凹形状の負レンズＬ１５から構成される。第３Ｃレンズ群Ｇ３Ｃは、両凸形状の正レンズＬ１６と、物体側に凸面を向けた正メニスカスレンズＬ１７と、両凹形状の負レンズＬ１８と両凸形状の正レンズＬ１９との２枚のレンズからなる接合レンズから構成される。 The third lens group G3 is composed of three groups: a third A lens group G3A having a positive refractive power, a third B lens group G3B having a negative refractive power, and a third C lens group G3C having a positive refractive power. Vibration isolation is performed by moving the group G3B including a component in the direction perpendicular to the optical axis. The third A lens group G3A is composed of a junction lens composed of two lenses, a biconcave negative lens L10 and a biconvex positive lens L11, and a biconvex positive lens L12. The third B lens group G3B is composed of a junction lens composed of two lenses, a biconvex positive lens L13 and a biconcave negative lens L14, and a biconcave negative lens L15. The third C lens group G3C consists of two lenses: a biconvex positive lens L16, a positive meniscus lens L17 with a convex surface facing the object side, a biconcave negative lens L18, and a biconvex positive lens L19. It is composed of a junction lens consisting of.
図１９は、本発明の実施例４の結像光学系のレンズ構成図である。物体側から像側へ順に、正の屈折力の第１レンズ群Ｇ１と、負の屈折力の第２レンズ群Ｇ２と、正の屈折力の第３レンズ群Ｇ３から構成される。 FIG. 19 is a lens configuration diagram of the imaging optical system according to the fourth embodiment of the present invention. From the object side to the image side, it is composed of a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a positive refractive power.
第１レンズ群Ｇ１は、正の屈折力の第１Ａレンズ群Ｇ１Ａと負の屈折力の第１Ｂレンズ群Ｇ１Ｂから構成される。第１Ａレンズ群Ｇ１Ａは、両凸形状の正レンズＬ１と、物体側に凸面を向けた正メニスカスレンズＬ２から構成される。第１Ｂレンズ群Ｇ１Ｂは、両凸形状の正レンズＬ３と両凹形状の負レンズＬ４との２枚のレンズからなる接合レンズと、物体側に凸面を向けた正メニスカスレンズＬ５と像面側に凹面を向けた負メニスカスレンズＬ６の２枚のレンズからなる接合レンズから構成される。 The first lens group G1 is composed of a first A lens group G1A having a positive refractive power and a first B lens group G1B having a negative refractive power. The first A lens group G1A is composed of a biconvex positive lens L1 and a positive meniscus lens L2 with a convex surface facing the object side. The first B lens group G1B consists of a junction lens consisting of two lenses, a biconvex positive lens L3 and a biconcave negative lens L4, a positive meniscus lens L5 with a convex surface facing the object side, and an image plane side. It is composed of a junction lens consisting of two lenses of a negative meniscus lens L6 with a concave surface facing.
第２レンズ群Ｇ２は、両凸形状の正レンズＬ７と両凹形状の負レンズＬ８との２枚のレンズからなる接合レンズと、両凹形状の負レンズＬ９から構成され、第２レンズ群Ｇ２を光軸に沿って像面側へ移動させることにより無限遠物体から近距離物体へのフォーカシングを行っている。開口絞りＳは第２レンズ群Ｇ２と第３レンズ群Ｇ３の間に配置されている。 The second lens group G2 is composed of a junction lens consisting of two lenses, a biconvex positive lens L7 and a biconcave negative lens L8, and a biconcave negative lens L9, and is composed of a biconcave negative lens L9. Is focused from an infinity object to a short-range object by moving the lens toward the image plane along the optical axis. The aperture diaphragm S is arranged between the second lens group G2 and the third lens group G3.
第３レンズ群Ｇ３は、正の屈折力の第３Ａレンズ群Ｇ３Ａ、負の屈折力の第３Ｂレンズ群Ｇ３Ｂ、正の屈折力の第３Ｃレンズ群Ｇ３Ｃの３つの群から構成され、第３Ｂレンズ群Ｇ３Ｂを光軸に対して垂直方向成分を含んで移動させることにより防振を行っている。第３Ａレンズ群Ｇ３Ａは、両凹形状の負レンズＬ１０と両凸形状の正レンズＬ１１との２枚のレンズからなる接合レンズと、両凸形状の正レンズＬ１２から構成される。第３Ｂレンズ群Ｇ３Ｂは、両凸形状の正レンズＬ１３と両凹形状の負レンズＬ１４との２枚のレンズからなる接合レンズと、両凹形状の負レンズＬ１５から構成される。第３Ｃレンズ群Ｇ３Ｃは、両凸形状の正レンズＬ１６と、物体側に凸面を向けた正メニスカスレンズＬ１７と、両凹形状の負レンズＬ１８と両凸形状の正レンズＬ１９との２枚のレンズからなる接合レンズから構成される。 The third lens group G3 is composed of three groups: a third A lens group G3A having a positive refractive power, a third B lens group G3B having a negative refractive power, and a third C lens group G3C having a positive refractive power. Vibration isolation is performed by moving the group G3B including a component in the direction perpendicular to the optical axis. The third A lens group G3A is composed of a junction lens composed of two lenses, a biconcave negative lens L10 and a biconvex positive lens L11, and a biconvex positive lens L12. The third B lens group G3B is composed of a junction lens composed of two lenses, a biconvex positive lens L13 and a biconcave negative lens L14, and a biconcave negative lens L15. The third C lens group G3C consists of two lenses: a biconvex positive lens L16, a positive meniscus lens L17 with a convex surface facing the object side, a biconcave negative lens L18, and a biconvex positive lens L19. It is composed of a junction lens consisting of.
図２５は、本発明の実施例５の結像光学系のレンズ構成図である。物体側から像側へ順に、正の屈折力の第１レンズ群Ｇ１と、負の屈折力の第２レンズ群Ｇ２と、正の屈折力の第３レンズ群Ｇ３から構成される。 FIG. 25 is a lens configuration diagram of the imaging optical system according to the fifth embodiment of the present invention. From the object side to the image side, it is composed of a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a positive refractive power.
第１レンズ群Ｇ１は、正の屈折力の第１Ａレンズ群Ｇ１Ａと負の屈折力の第１Ｂレンズ群Ｇ１Ｂから構成される。第１Ａレンズ群Ｇ１Ａは、両凸形状の正レンズＬ１と、物体側に凸面を向けた正メニスカスレンズＬ２から構成される。第１Ｂレンズ群Ｇ１Ｂは、両凸形状の正レンズＬ３と両凹形状の負レンズＬ４との２枚のレンズからなる接合レンズと、物体側に凸面を向けた正メニスカスレンズＬ５と像面側に凹面を向けた負メニスカスレンズＬ６の２枚のレンズからなる接合レンズから構成される。 The first lens group G1 is composed of a first A lens group G1A having a positive refractive power and a first B lens group G1B having a negative refractive power. The first A lens group G1A is composed of a biconvex positive lens L1 and a positive meniscus lens L2 with a convex surface facing the object side. The first B lens group G1B consists of a junction lens consisting of two lenses, a biconvex positive lens L3 and a biconcave negative lens L4, a positive meniscus lens L5 with a convex surface facing the object side, and an image plane side. It is composed of a junction lens consisting of two lenses of a negative meniscus lens L6 with a concave surface facing.
第２レンズ群Ｇ２は、両凸形状の正レンズＬ７と両凹形状の負レンズＬ８との２枚のレンズからなる接合レンズと、像面側に凹面を向けた負メニスカスレンズＬ９から構成され、第２レンズ群Ｇ２を光軸に沿って像面側へ移動させることにより無限遠物体から近距離物体へのフォーカシングを行っている。開口絞りＳは第２レンズ群Ｇ２と第３レンズ群Ｇ３の間に配置されている。 The second lens group G2 is composed of a junction lens consisting of two lenses, a biconvex positive lens L7 and a biconcave negative lens L8, and a negative meniscus lens L9 with a concave surface facing the image plane side. Focusing from an infinity object to a short-range object is performed by moving the second lens group G2 toward the image plane side along the optical axis. The aperture diaphragm S is arranged between the second lens group G2 and the third lens group G3.
第３レンズ群Ｇ３は、正の屈折力の第３Ａレンズ群Ｇ３Ａ、負の屈折力の第３Ｂレンズ群Ｇ３Ｂ、正の屈折力の第３Ｃレンズ群Ｇ３Ｃの３つの群から構成され、第３Ｂレンズ群Ｇ３Ｂを光軸に対して垂直方向成分を含んで移動させることにより防振を行っている。第３Ａレンズ群Ｇ３Ａは、像面側に凹面を向けた負メニスカスレンズＬ１０と両凸形状の正レンズＬ１１との２枚のレンズからなる接合レンズと、物体側に凸面を向けた正メニスカスレンズＬ１２から構成される。第３Ｂレンズ群Ｇ３Ｂは、像面側に凸面を向けた正メニスカスレンズＬ１３と両凹形状の負レンズＬ１４との２枚のレンズからなる接合レンズと、両凹形状の負レンズＬ１５から構成される。第３Ｃレンズ群Ｇ３Ｃは、両凸形状の正レンズＬ１６と、物体側に凸面を向けた正メニスカスレンズＬ１７と、両凹形状の負レンズＬ１８と両凸形状の正レンズＬ１９との２枚のレンズからなる接合レンズから構成される。 The third lens group G3 is composed of three groups: a third A lens group G3A having a positive refractive power, a third B lens group G3B having a negative refractive power, and a third C lens group G3C having a positive refractive power. Vibration isolation is performed by moving the group G3B including a component in the direction perpendicular to the optical axis. The third A lens group G3A is a junction lens consisting of two lenses, a negative meniscus lens L10 having a concave surface facing the image plane side and a biconvex positive lens L11, and a positive meniscus lens L12 having a convex surface facing the object side. Consists of. The third B lens group G3B is composed of a junction lens consisting of two lenses, a positive meniscus lens L13 having a convex surface facing the image plane side and a biconcave negative lens L14, and a biconcave negative lens L15. .. The third C lens group G3C consists of two lenses: a biconvex positive lens L16, a positive meniscus lens L17 with a convex surface facing the object side, a biconcave negative lens L18, and a biconvex positive lens L19. It is composed of a junction lens consisting of.
以下に、前述した本発明の結像光学系の各実施例の具体的な数値データを示す。 Specific numerical data of each embodiment of the imaging optical system of the present invention described above is shown below.
［面データ］において、面番号は物体側から数えたレンズ面又は開口絞りの番号、ｒは各面の曲率半径、ｄは各面の間隔、ｎｄはｄ線（波長５８７．５６ｎｍ）に対する屈折率、ｖｄはｄ線に対するアッベ数、θｇＦはｇ線とＦ線に関する部分分散比を示している。 In [surface data], the surface number is the number of the lens surface or aperture diaphragm counted from the object side, r is the radius of curvature of each surface, d is the distance between each surface, and nd is the refractive index for the d line (wavelength 587.56 nm). , Vd is the Abbe number with respect to the d line, and θgF is the partial dispersion ratio of the g line and the F line.
ＢＦはバックフォーカスを表している。 BF represents back focus.
面番号に付した（絞り）は、その位置に開口絞りが位置していることを示している。平面又は開口絞りに対する曲率半径には∞（無限大）を記入している。 The (aperture) attached to the surface number indicates that the aperture diaphragm is located at that position. ∞ (infinity) is entered for the radius of curvature for a plane or aperture stop.
［各種データ］には、撮影距離がＩＮＦと所定の撮影距離のときの焦点距離等の値を示している。 [Various data] shows values such as the focal length when the shooting distance is INF and a predetermined shooting distance.
［可変間隔データ］には、撮影距離がＩＮＦと所定の撮影距離のときの可変面間隔及びBF（バックフォーカス）の値を示している。 [Variable spacing data] shows the values of the variable surface spacing and BF (back focus) when the shooting distance is INF and a predetermined shooting distance.
［レンズ群データ］には、各レンズ群を構成する最も物体側の面番号及び群全体の合成焦点距離を示している。 [Lens group data] shows the surface number on the most object side constituting each lens group and the composite focal length of the entire group.
なお、以下の全ての諸元の値において、記載している焦点距離ｆ、曲率半径ｒ、レンズ面間隔ｄ、その他の長さの単位は特記のない限りミリメートル（ｍｍ）を使用するが、光学系では比例拡大と比例縮小とにおいても同等の光学性能が得られるので、これに限られるものではない。 In all the following specification values, the units of the focal length f, the radius of curvature r, the lens surface spacing d, and other lengths described are millimeters (mm) unless otherwise specified, but optics. The system is not limited to this because the same optical performance can be obtained in both proportional expansion and proportional reduction.
また、これらの各実施例における条件式の対応値の一覧を示す。 In addition, a list of corresponding values of the conditional expressions in each of these examples is shown.
また、各実施例に対応する収差図において、ｄ、ｇ、Ｃはそれぞれｄ線、ｇ線、Ｃ線を表しており、△Ｓ、△Ｍはそれぞれサジタル像面、メリジオナル像面を表している。 Further, in the aberration diagram corresponding to each embodiment, d, g, and C represent d-line, g-line, and C-line, respectively, and ΔS and ΔM represent sagittal image planes and meridional image planes, respectively. ..
数値実施例1
単位：mm
[面データ]
面番号 r d nd vd θgF
物面 ∞ (d0)
1 198.8338 10.2285 1.49700 81.61 0.5386
2 -5696.2958 1.5000
3 121.6258 12.9769 1.43700 95.10 0.5332
4 999.9737 13.0000
5 91.4762 15.2219 1.49700 81.61 0.5386
6 -974.3321 3.0000 1.65412 39.68 0.5737
7 168.5344 0.2000
8 54.6376 10.0692 1.49700 81.61 0.5386
9 86.7909 2.9457 1.61340 44.27 0.5633
10 43.4337 (d10)
11 178.1407 4.4503 1.80809 22.76 0.6285
12 -422.1221 1.5000 1.80420 46.50 0.5574
13 117.5341 3.4558
14 -940.7056 1.5000 1.58144 40.89 0.5767
15 79.9174 (d15)
16(絞り) ∞ 3.0000
17 359.7517 1.4000 1.78880 28.43 0.6009
18 45.9261 9.3922 1.59282 68.63 0.5441
19 -215.0839 0.2000
20 70.4113 5.7561 1.87070 40.74 0.5683
21 468.6274 3.5740
22 -1446.5133 3.9357 1.92286 20.88 0.6389
23 -81.7582 1.2000 1.65100 56.24 0.5420
24 53.4612 3.9948
25 -228.8793 1.2000 1.71300 53.94 0.5439
26 84.4810 3.0000
27 85.9590 5.1838 1.80420 46.50 0.5574
28 -427.4180 0.2000
29 116.0492 4.0389 1.87070 40.73 0.5683
30 589.2252 1.9888
31 -102.1187 1.4002 1.84666 23.78 0.6192
32 109.4921 9.8411 1.87070 40.73 0.5683
33 -89.9292 54.1111
像面 ∞
[各種データ]
INF 1900mm
焦点距離 195.60 200.34
Fナンバー 1.84 1.95
全画角2ω 12.56 9.36
像高Y 21.63 21.63
レンズ全長 239.72 239.72
[可変間隔データ]
INF 1900mm
d0 1660.3283
d10 15.3147 33.9574
d15 30.9422 12.2995
BF 54.1111 54.1111
[レンズ群データ]
群 始面 焦点距離
G1 1 159.02
G2 11 -99.51
G3 17 103.53
G1A 1 175.46
G1B 5 -1589.39
G3A 17 87.64
G3B 22 -46.43
G3C 27 55.66
Numerical Example 1
Unit: mm
[Surface data]
Surface number rd nd vd θgF
Physical surface ∞ (d0)
1 198.8338 10.2285 1.49700 81.61 0.5386
2 -5696.2958 1.5000
3 121.6258 12.9769 1.43700 95.10 0.5332
4 999.9737 13.0000
5 91.4762 15.2219 1.49700 81.61 0.5386
6 -974.3321 3.0000 1.65412 39.68 0.5737
7 168.5344 0.2000
8 54.6376 10.0692 1.49700 81.61 0.5386
9 86.7909 2.9457 1.61340 44.27 0.5633
10 43.4337 (d10)
11 178.1407 4.4503 1.80809 22.76 0.6285
12 -422.1221 1.5000 1.80420 46.50 0.5574
13 117.5341 3.4558
14 -940.7056 1.5000 1.58144 40.89 0.5767
15 79.9174 (d15)
16 (Aperture) ∞ 3.0000
17 359.7517 1.4000 1.78880 28.43 0.6009
18 45.9261 9.3922 1.59282 68.63 0.5441
19 -215.0839 0.2000
20 70.4113 5.7561 1.87070 40.74 0.5683
21 468.6274 3.5740
22 -1446.5133 3.9357 1.92286 20.88 0.6389
23 -81.7582 1.2000 1.65100 56.24 0.5420
24 53.4612 3.9948
25 -228.8793 1.2000 1.71300 53.94 0.5439
26 84.4810 3.0000
27 85.9590 5.1838 1.80420 46.50 0.5574
28 -427.4180 0.2000
29 116.0492 4.0389 1.87070 40.73 0.5683
30 589.2252 1.9888
31 -102.1187 1.4002 1.84666 23.78 0.6192
32 109.4921 9.8411 1.87070 40.73 0.5683
33 -89.9292 54.1111
Image plane ∞
[Various data]
INF 1900mm
Focal length 195.60 200.34
F number 1.84 1.95
Full angle of view 2ω 12.56 9.36
Image height Y 21.63 21.63
Lens total length 239.72 239.72
[Variable interval data]
INF 1900mm
d0 1660.3283
d10 15.3147 33.9574
d15 30.9422 12.2995
BF 54.1111 54.1111
[Lens group data]
Focal length
G1 1 159.02
G2 11 -99.51
G3 17 103.53
G1A 1 175.46
G1B 5 -1589.39
G3A 17 87.64
G3B 22 -46.43
G3C 27 55.66
数値実施例2
単位：mm
[面データ]
面番号 r d nd vd θgF
物面 ∞ (d0)
1 469.2059 7.5732 1.48749 70.45 0.5303
2 -511.2594 1.6447
3 109.0877 12.8016 1.43700 95.10 0.5332
4 1000.0000 10.0000
5 92.1493 14.0874 1.49700 81.61 0.5386
6 -999.9209 3.0000 1.67300 38.26 0.5757
7 179.3970 0.2000
8 55.6155 10.7194 1.55032 75.50 0.5405
9 86.2413 3.5563 1.61340 44.27 0.5633
10 43.3843 (d10)
11 221.7795 4.3992 1.80809 22.76 0.6285
12 -249.4711 1.5000 1.80420 46.50 0.5574
13 142.4955 2.8198
14 -814.0149 1.6985 1.58144 40.89 0.5767
15 79.1097 (d15)
16(絞り) ∞ 3.0000
17 1244.1779 1.4000 1.78880 28.43 0.6009
18 48.1352 9.4953 1.59282 68.63 0.5441
19 -152.6074 0.2000
20 69.0197 6.0896 1.87070 40.73 0.5683
21 593.6721 3.5666
22 -868.9441 3.9550 1.92286 20.88 0.6389
23 -78.3371 1.2000 1.65100 56.24 0.5420
24 53.4466 3.9979
25 -237.1154 1.2000 1.71300 53.94 0.5439
26 88.5104 3.0000
27 90.4664 5.1418 1.87070 40.73 0.5683
28 -389.5672 0.2000
29 119.5488 3.9319 1.87070 40.73 0.5683
30 448.5444 1.9753
31 -109.6020 1.4000 1.84666 23.78 0.6192
32 73.4625 10.3002 1.87070 40.73 0.5683
33 -97.3631 54.3633
像面 ∞
[各種データ]
INF 1800mm
焦点距離 178.98 185.18
Fナンバー 1.84 1.93
全画角2ω 13.71 10.42
像高Y 21.63 21.63
レンズ全長 232.10 232.10
[可変間隔データ]
INF 1800mm
d0 1567.9452
d10 14.8871 33.4378
d15 28.8005 10.2499
BF 54.3633 54.3633
[レンズ群データ]
群 始面 焦点距離
G1 1 154.81
G2 11 -100.51
G3 17 98.66
G1A 1 180.21
G1B 5 -4597.06
G3A 17 83.60
G3B 22 -46.86
G3C 27 55.96
Numerical Example 2
Unit: mm
[Surface data]
Surface number rd nd vd θgF
Physical surface ∞ (d0)
1 469.2059 7.5732 1.48749 70.45 0.5303
2-511.2594 1.6447
3 109.0877 12.8016 1.43700 95.10 0.5332
4 1000.0000 10.0000
5 92.1493 14.0874 1.49700 81.61 0.5386
6 -999.9209 3.0000 1.67300 38.26 0.5757
7 179.3970 0.2000
8 55.6155 10.7194 1.55032 75.50 0.5405
9 86.2413 3.5563 1.61340 44.27 0.5633
10 43.3843 (d10)
11 221.7795 4.3992 1.80809 22.76 0.6285
12 -249.4711 1.5000 1.80420 46.50 0.5574
13 142.4955 2.8198
14 -814.0149 1.6985 1.58144 40.89 0.5767
15 79.1097 (d15)
16 (Aperture) ∞ 3.0000
17 1244.1779 1.4000 1.78880 28.43 0.6009
18 48.1352 9.4953 1.59282 68.63 0.5441
19 -152.6074 0.2000
20 69.0197 6.0896 1.87070 40.73 0.5683
21 593.6721 3.5666
22 -868.9441 3.9550 1.92286 20.88 0.6389
23 -78.3371 1.2000 1.65100 56.24 0.5420
24 53.4466 3.9979
25 -237.1154 1.2000 1.71300 53.94 0.5439
26 88.5104 3.0000
27 90.4664 5.1418 1.87070 40.73 0.5683
28 -389.5672 0.2000
29 119.5488 3.9319 1.87070 40.73 0.5683
30 448.5444 1.9753
31 -109.6020 1.4000 1.84666 23.78 0.6192
32 73.4625 10.3002 1.87070 40.73 0.5683
33 -97.3631 54.3633
Image plane ∞
[Various data]
INF 1800mm
Focal length 178.98 185.18
F number 1.84 1.93
Full angle of view 2ω 13.71 10.42
Image height Y 21.63 21.63
Total lens length 232.10 232.10
[Variable interval data]
INF 1800mm
d0 1567.9452
d10 14.8871 33.4378
d15 28.8005 10.2499
BF 54.3633 54.3633
[Lens group data]
Focal length
G1 1 154.81
G2 11 -100.51
G3 17 98.66
G1A 1 180.21
G1B 5 -4597.06
G3A 17 83.60
G3B 22 -46.86
G3C 27 55.96
数値実施例3
単位：mm
[面データ]
面番号 r d nd vd θgF
物面 ∞ (d0)
1 203.6430 11.2718 1.49700 81.61 0.5386
2 -2567.8704 1.5554
3 124.6271 13.4521 1.43700 95.10 0.5332
4 1031.5210 12.1216
5 92.9832 15.9651 1.49700 81.61 0.5386
6 -999.6839 3.6514 1.65412 39.68 0.5737
7 180.9344 0.2015
8 56.1292 9.8254 1.49700 81.61 0.5386
9 88.3581 2.8890 1.61340 44.27 0.5633
10 44.1643 (d10)
11 185.5195 4.5821 1.80809 22.76 0.6285
12 -399.3392 1.5004 1.80610 40.73 0.5670
13 117.2797 3.7594
14 -654.2740 1.5896 1.57099 50.80 0.5588
15 81.8004 (d15)
16(絞り) ∞ 3.1930
17 -1176.7782 1.0000 1.76182 26.61 0.6123
18 57.3721 7.8707 1.59282 68.63 0.5441
19 -218.5291 0.2000
20 78.0729 7.4173 1.77250 49.62 0.5505
21 -867.0466 3.0000
22 1605.8432 3.7482 1.92286 20.88 0.6389
23 -101.2287 1.8907 1.67790 55.52 0.5446
24 53.8440 3.4912
25 -501.2697 1.2000 1.72916 54.67 0.5451
26 89.0739 3.0712
27 94.9951 4.8774 1.72000 43.61 0.5683
28 -342.9986 0.2000
29 69.4953 6.0682 1.88100 40.14 0.5704
30 131.7288 2.5405
31 -241.2677 4.0000 1.84666 23.78 0.6192
32 68.6149 8.9964 1.80610 33.27 0.5881
33 -164.2712 55.2054
像面 ∞
[各種データ]
INF 1900mm
焦点距離 225.46 222.97
Fナンバー 2.02 2.16
全画角2ω 10.91 7.56
像高Y 21.63 21.63
レンズ全長 257.29 257.29
[可変間隔データ]
INF 1900mm
d0 1642.7644
d10 15.7570 34.3463
d15 41.1936 22.6044
BF 55.2054 55.2054
[レンズ群データ]
群 始面 焦点距離
G1 1 157.82
G2 11 -97.62
G3 17 123.57
G1A 1 176.43
G1B 5 -1916.02
G3A 17 98.85
G3B 22 -51.22
G3C 27 61.61
Numerical Example 3
Unit: mm
[Surface data]
Surface number rd nd vd θgF
Physical surface ∞ (d0)
1 203.6430 11.2718 1.49700 81.61 0.5386
2 -2567.8704 1.5554
3 124.6271 13.4521 1.43700 95.10 0.5332
4 1031.5210 12.1216
5 92.9832 15.9651 1.49700 81.61 0.5386
6 -999.6839 3.6514 1.65412 39.68 0.5737
7 180.9344 0.2015
8 56.1292 9.8254 1.49700 81.61 0.5386
9 88.3581 2.8890 1.61340 44.27 0.5633
10 44.1643 (d10)
11 185.5195 4.5821 1.80809 22.76 0.6285
12 -399.3392 1.5004 1.80610 40.73 0.5670
13 117.2797 3.7594
14 -654.2740 1.5896 1.57099 50.80 0.5588
15 81.8004 (d15)
16 (Aperture) ∞ 3.1930
17 -1176.7782 1.0000 1.76182 26.61 0.6123
18 57.3721 7.8707 1.59282 68.63 0.5441
19 -218.5291 0.2000
20 78.0729 7.4173 1.77250 49.62 0.5505
21 -867.0466 3.0000
22 1605.8432 3.7482 1.92286 20.88 0.6389
23 -101.2287 1.8907 1.67790 55.52 0.5446
24 53.8440 3.4912
25 -501.2697 1.2000 1.72916 54.67 0.5451
26 89.0739 3.0712
27 94.9951 4.8774 1.72000 43.61 0.5683
28 -342.9986 0.2000
29 69.4953 6.0682 1.88100 40.14 0.5704
30 131.7288 2.5405
31 -241.2677 4.0000 1.84666 23.78 0.6192
32 68.6149 8.9964 1.80610 33.27 0.5881
33 -164.2712 55.2054
Image plane ∞
[Various data]
INF 1900mm
Focal length 225.46 222.97
F number 2.02 2.16
Full angle of view 2ω 10.91 7.56
Image height Y 21.63 21.63
Total lens length 257.29 257.29
[Variable interval data]
INF 1900mm
d0 1642.7644
d10 15.7570 34.3463
d15 41.1936 22.6044
BF 55.2054 55.2054
[Lens group data]
Focal length
G1 1 157.82
G2 11 -97.62
G3 17 123.57
G1A 1 176.43
G1B 5 -1916.02
G3A 17 98.85
G3B 22 -51.22
G3C 27 61.61
数値実施例4
単位：mm
[面データ]
面番号 r d nd vd θgF
物面 ∞ (d0)
1 250.9698 11.5572 1.49700 81.61 0.5386
2 -1377.9485 1.5000
3 125.0990 16.0784 1.43700 95.10 0.5332
4 1589.4410 13.0000
5 94.3366 17.9266 1.49700 81.61 0.5386
6 -898.5145 3.0083 1.67300 38.26 0.5757
7 188.1074 0.2000
8 59.3370 9.7736 1.55032 75.50 0.5405
9 91.9383 2.5498 1.61340 44.27 0.5633
10 45.8491 (d10)
11 216.0455 5.2701 1.80809 22.76 0.6285
12 -248.8819 1.5000 1.80450 39.63 0.5710
13 140.9246 3.5003
14 -819.2435 1.5000 1.56732 42.84 0.5747
15 79.3307 (d15)
16(絞り) ∞ 3.0724
17 -3238.1220 1.4000 1.78880 28.43 0.6009
18 65.3208 7.1414 1.55032 75.50 0.5405
19 -311.2995 0.2000
20 82.3843 6.5283 1.61272 58.58 0.5449
21 -225.2995 3.0000
22 450.8539 3.6854 1.92286 20.88 0.6389
23 -124.1266 1.2000 1.65100 56.24 0.5420
24 48.6625 4.1945
25 -282.8121 1.2000 1.71300 53.94 0.5439
26 98.7072 3.7976
27 83.9722 5.2439 1.70154 41.15 0.5766
28 -527.7711 0.2000
29 76.1736 6.2942 1.85026 32.27 0.5929
30 342.6958 1.0533
31 -497.9922 1.4000 1.84666 23.78 0.6192
32 46.4044 14.8994 1.80610 33.27 0.5881
33 -1088.6495 54.7628
像面 ∞
[各種データ]
INF 2000mm
焦点距離 244.97 233.04
Fナンバー 2.02 2.13
全画角2ω 10.04 7.03
像高Y 21.63 21.63
レンズ全長 264.35 264.35
[可変間隔データ]
INF 2000mm
d0 1735.7019
d10 17.0227 35.5338
d15 40.6879 22.1769
BF 54.7628 54.7628
[レンズ群データ]
群 始面 焦点距離
G1 1 159.20
G2 11 -103.34
G3 17 145.97
G1A 1 181.46
G1B 5 -2913.78
G3A 17 122.10
G3B 22 -52.19
G3C 27 60.43
Numerical Example 4
Unit: mm
[Surface data]
Surface number rd nd vd θgF
Physical surface ∞ (d0)
1 250.9698 11.5572 1.49700 81.61 0.5386
2 -1377.9485 1.5000
3 125.0990 16.0784 1.43700 95.10 0.5332
4 1589.4410 13.0000
5 94.3366 17.9266 1.49700 81.61 0.5386
6 -898.5145 3.0083 1.67300 38.26 0.5757
7 188.1074 0.2000
8 59.3370 9.7736 1.55032 75.50 0.5405
9 91.9383 2.5498 1.61340 44.27 0.5633
10 45.8491 (d10)
11 216.0455 5.2701 1.80809 22.76 0.6285
12 -248.8819 1.5000 1.80450 39.63 0.5710
13 140.9246 3.5003
14 -819.2435 1.5000 1.56732 42.84 0.5747
15 79.3307 (d15)
16 (Aperture) ∞ 3.0724
17 -3238.1220 1.4000 1.78880 28.43 0.6009
18 65.3208 7.1414 1.55032 75.50 0.5405
19 -311.2995 0.2000
20 82.3843 6.5283 1.61272 58.58 0.5449
21 -225.2995 3.0000
22 450.8539 3.6854 1.92286 20.88 0.6389
23 -124.1266 1.2000 1.65100 56.24 0.5420
24 48.6625 4.1945
25 -282.8121 1.2000 1.71300 53.94 0.5439
26 98.7072 3.7976
27 83.9722 5.2439 1.70154 41.15 0.5766
28 -527.7711 0.2000
29 76.1736 6.2942 1.85026 32.27 0.5929
30 342.6958 1.0533
31 -497.9922 1.4000 1.84666 23.78 0.6192
32 46.4044 14.8994 1.80610 33.27 0.5881
33 -1088.6495 54.7628
Image plane ∞
[Various data]
INF 2000mm
Focal length 244.97 233.04
F number 2.02 2.13
Full angle of view 2ω 10.04 7.03
Image height Y 21.63 21.63
Total lens length 264.35 264.35
[Variable interval data]
INF 2000mm
d0 1735.7019
d10 17.0227 35.5338
d15 40.6879 22.1769
BF 54.7628 54.7628
[Lens group data]
Focal length
G1 1 159.20
G2 11 -103.34
G3 17 145.97
G1A 1 181.46
G1B 5 -2913.78
G3A 17 122.10
G3B 22 -52.19
G3C 27 60.43
数値実施例5
単位：mm
[面データ]
面番号 r d nd vd θgF
物面 ∞ (d0)
1 221.4487 10.0769 1.49700 81.61 0.5386
2 -1627.5887 1.5000
3 121.4760 12.9927 1.43700 95.10 0.5332
4 999.8177 13.0000
5 93.8691 15.1230 1.49700 81.61 0.5386
6 -845.5083 3.0001 1.67300 38.26 0.5757
7 203.2070 0.2000
8 52.2066 10.0369 1.49700 81.61 0.5386
9 75.2309 3.0606 1.61340 44.27 0.5633
10 41.9403 (d10)
11 677.9769 3.5026 1.80809 22.76 0.6285
12 -233.5131 1.5000 1.80420 46.50 0.5574
13 142.3970 2.0985
14 709.1978 1.5000 1.56384 60.83 0.5405
15 78.5212 (d15)
16(絞り) ∞ 3.0000
17 1594.0739 1.4000 1.78880 28.43 0.6009
18 49.5778 9.6560 1.55032 75.50 0.5405
19 -130.9372 0.2000
20 72.3887 7.5920 1.83481 42.72 0.5650
21 1999.9854 3.3734
22 -686.8586 4.0905 1.92286 20.88 0.6389
23 -77.4725 1.2000 1.65100 56.24 0.5420
24 51.7373 3.9040
25 -312.6403 1.2000 1.71300 53.94 0.5439
26 86.7618 3.0000
27 88.5830 5.0682 1.80420 46.50 0.5574
28 -514.0981 0.2000
29 81.7968 5.2679 1.87070 40.73 0.5683
30 177.4699 2.6948
31 -94.0066 1.4000 1.84666 23.78 0.6192
32 136.6318 6.2970 1.87070 40.73 0.5683
33 -79.4957 54.0000
像面 ∞
[各種データ]
INF 1900mm
焦点距離 196.00 199.94
Fナンバー 1.84 1.94
全画角2ω 12.53 9.38
像高Y 21.63 21.63
レンズ全長 238.40 238.40
[可変間隔データ]
INF 1900mm
d0 1661.6508
d10 17.0022 33.0694
d15 30.2615 14.1944
BF 54.0000 54.0000
[レンズ群データ]
群 始面 焦点距離
G1 1 148.96
G2 11 -92.00
G3 17 104.11
G1A 1 176.38
G1B 5 -22564.40
G3A 17 87.49
G3B 22 -46.65
G3C 27 55.81
Numerical Example 5
Unit: mm
[Surface data]
Surface number rd nd vd θgF
Physical surface ∞ (d0)
1 221.4487 10.0769 1.49700 81.61 0.5386
2-1627.5887 1.5000
3 121.4760 12.9927 1.43700 95.10 0.5332
4 999.8177 13.0000
5 93.8691 15.1230 1.49700 81.61 0.5386
6 -845.5083 3.0001 1.67300 38.26 0.5757
7 203.2070 0.2000
8 52.2066 10.0369 1.49700 81.61 0.5386
9 75.2309 3.0606 1.61340 44.27 0.5633
10 41.9403 (d10)
11 677.9769 3.5026 1.80809 22.76 0.6285
12 -233.5131 1.5000 1.80420 46.50 0.5574
13 142.3970 2.0985
14 709.1978 1.5000 1.56384 60.83 0.5405
15 78.5212 (d15)
16 (Aperture) ∞ 3.0000
17 1594.0739 1.4000 1.78880 28.43 0.6009
18 49.5778 9.6560 1.55032 75.50 0.5405
19 -130.9372 0.2000
20 72.3887 7.5920 1.83481 42.72 0.5650
21 1999.9854 3.3734
22 -686.8586 4.0905 1.92286 20.88 0.6389
23 -77.4725 1.2000 1.65100 56.24 0.5420
24 51.7373 3.9040
25 -312.6403 1.2000 1.71300 53.94 0.5439
26 86.7618 3.0000
27 88.5830 5.0682 1.80420 46.50 0.5574
28 -514.0981 0.2000
29 81.7968 5.2679 1.87070 40.73 0.5683
30 177.4699 2.6948
31 -94.0066 1.4000 1.84666 23.78 0.6192
32 136.6318 6.2970 1.87070 40.73 0.5683
33 -79.4957 54.0000
Image plane ∞
[Various data]
INF 1900mm
Focal length 196.00 199.94
F number 1.84 1.94
Full angle of view 2ω 12.53 9.38
Image height Y 21.63 21.63
Total lens length 238.40 238.40
[Variable interval data]
INF 1900mm
d0 1661.6508
d10 17.0022 33.0694
d15 30.2615 14.1944
BF 54.0000 54.0000
[Lens group data]
Focal length
G1 1 148.96
G2 11 -92.00
G3 17 104.11
G1A 1 176.38
G1B 5 -22564.40
G3A 17 87.49
G3B 22 -46.65
G3C 27 55.81
[条件式対応値]
条件式／実施例 1 2 3 4 5
(1) f1/f 0.813 0.865 0.700 0.650 0.760
(2) f2/f -0.509 -0.562 -0.433 -0.422 -0.469
(3) β2 3.67 3.93 3.63 3.02 3.81
(4) νdp1f 81.61 70.45 81.61 81.61 81.61
(5) θgFp1f-0.6483+0.0018×νdp1f 0.0372 0.0089 0.0372 0.0372 0.0372
(6) θgFp2-0.6483+0.0018×νdp2 0.0212 0.0212 0.0212 0.0212 0.0212
(7) θgFn2-0.6483+0.0018×νdn2 -0.0072 -0.0072 -0.0080 -0.0060 -0.0072
(8) L1A1B/L 0.054 0.043 0.047 0.049 0.055
(9) νdp1A 81.61 70.45 81.61 81.61 81.61
(10)θgFp1A-0.6483+0.0018×νdp1A 0.0372 0.0089 0.0372 0.0372 0.0372
(11) νdp3 68.63 68.63 68.63 75.50 75.50
(12) θgFp3-0.6483+0.0018×νdp3 0.0193 0.0193 0.0193 0.0281 0.0281
[Conditional expression correspondence value]
Conditional expression / Example 1 2 3 4 5
(1) f1 / f 0.813 0.865 0.700 0.650 0.760
(2) f2 / f -0.509 -0.562 -0.433 -0.422 -0.469
(3) β2 3.67 3.93 3.63 3.02 3.81
(4) νdp1f 81.61 70.45 81.61 81.61 81.61
(5) θgFp1f-0.6483 + 0.0018 × νdp1f 0.0372 0.0089 0.0372 0.0372 0.0372
(6) θgFp2-0.6483 + 0.0018 × ν dp2 0.0212 0.0212 0.0212 0.0212 0.0212
(7) θgFn2-0.6483 + 0.0018 × νdn2 -0.0072 -0.0072 -0.0080 -0.0060 -0.0072
(8) L1A1B / L 0.054 0.043 0.047 0.049 0.055
(9) νdp1A 81.61 70.45 81.61 81.61 81.61
(10) θgFp1A-0.6483 + 0.0018 × νdp1A 0.0372 0.0089 0.0372 0.0372 0.0372
(11) νdp3 68.63 68.63 68.63 75.50 75.50
(12) θgFp3-0.6483 + 0.0018 × ν dp3 0.0193 0.0193 0.0193 0.0281 0.0281
Ｇ１ 第１レンズ群
Ｇ２ 第２レンズ群
Ｇ３ 第３レンズ群
Ｇ１Ａ 第１Ａレンズ群
Ｇ１Ｂ 第１Ｂレンズ群
Ｇ３Ａ 第３Ａレンズ群
Ｇ３Ｂ 第３Ｂレンズ群
Ｇ３Ｃ 第３Ｃレンズ群
Ｓ 開口絞り
Ｉ 像面
G1 1st lens group G2 2nd lens group G3 3rd lens group G1A 1A lens group G1B 1B lens group G3A 3A lens group G3B 3B lens group G3C 3C lens group S Aperture aperture I image plane
Claims (7)
（１）ｆ１／ｆ＞０．６１
（２）−０．６６＜ｆ２／ｆ＜−０．４
（３）β２＜４．２
但し、
ｆ：無限遠合焦時の前記結像光学系全系の焦点距離
ｆ１：第１レンズ群Ｇ１の焦点距離
ｆ２：第２レンズ群Ｇ２の焦点距離
β２：無限遠合焦時の第２レンズ群Ｇ２の横倍率 In the imaging optical system including the first lens group G1 having a positive refractive power, the second lens group G2 having a negative refractive power, and the third lens group G3 having a positive refractive power in this order from the object side to the image side, the first lens group The 1 lens group G1 is composed of the 1st A lens group G1A and the 1st B lens group G1B in order from the object side with the widest air spacing in the 1st lens group G1 as a boundary, and the second lens group G2 is along the optical axis. Focusing is performed by moving the lens, and vibration isolation is performed by moving at least a part of the third lens group G3 including a component in the direction perpendicular to the optical axis to satisfy the following conditional expression. A featured imaging optical system.
(1) f1 / f> 0.61
(2) -0.66 <f2 / f <-0.4
(3) β2 <4.2
However,
f: Focal length of the entire imaging optical system during infinity focusing f1: Focal length of the first lens group G1 f2: Focal length of the second lens group G2 β2: Second lens group during infinity focusing Horizontal magnification of G2
（４）νｄｐ１ｆ＞６０
（５）θｇＦｐ１ｆ−０．６４８３＋０．００１８×νｄｐ１ｆ＞０．００１
但し、
νｄｐ１ｆ：前記結像光学系のうち最も物体側に位置する正レンズの、ｄ線に関するアッベ数
θｇＦｐ１ｆ：前記結像光学系のうち最も物体側に位置する正レンズの、ｇ線とＦ線に関する部分分散比 The imaging optical system according to claim 1, wherein the conditional expression shown below is satisfied.
(4) νdp1f> 60
(5) θgFp1f-0.6483 + 0.0018 × νdp1f> 0.001
However,
νdp1f: Abbe number related to d-line of the positive lens located closest to the object side in the imaging optical system θgFp1f: Part related to g-line and F-line of the positive lens located closest to the object side in the imaging optical system Dispersion ratio
（６）θｇＦｐ２−０．６４８３＋０．００１８×νｄｐ２＞０．０１
（７）θｇＦｎ２−０．６４８３＋０．００１８×νｄｎ２＜−０．００１
但し、
νｄｐ２：前記第２レンズ群Ｇ２が有する正レンズうち、少なくとも１枚のｄ線に関するアッベ数
θｇＦｐ２：前記第２レンズ群Ｇ２が有する正レンズうち、少なくとも１枚のｇ線とＦ線に関する部分分散比
νｄｎ２：前記第２レンズ群Ｇ２が有する負レンズのうち、少なくとも１枚のｄ線に関するアッベ数
θｇＦｎ２：前記第２レンズ群Ｇ２が有する負レンズのうち、少なくとも１枚のｇ線とＦ線に関する部分分散比 The imaging optical system according to claim 1 or 2, wherein the second lens group G2 has at least one positive lens and a plurality of negative lenses, and satisfies the conditional expression shown below.
(6) θgFp2-0.6483 + 0.0018 × νdp2> 0.01
(7) θgFn2-0.6483 + 0.0018 × νdn2 <-0.001
However,
νdp2: Abbe number θgFp2 for at least one d-line of the positive lenses of the second lens group G2: partial dispersion ratio of at least one g-line and F-line of the positive lenses of the second lens group G2. νdn2: Abbe number θgFn2 for at least one d-line among the negative lenses of the second lens group G2: a portion related to at least one g-line and F-line among the negative lenses of the second lens group G2. Dispersion ratio
（８）０．０２＜Ｌ１Ａ１Ｂ／Ｌ＜０．２
但し、
Ｌ：前記結像光学系のうち、最も物体側のレンズ面から像面までの距離
Ｌ１Ａ１Ｂ：前記第１レンズ群Ｇ１における最大空気間隔 The imaging optical system according to any one of claims 1 to 3, wherein the imaging optical system satisfies the conditional expression shown below.
(8) 0.02 <L1A1B / L <0.2
However,
L: Distance from the lens surface to the image surface on the object side of the imaging optical system L1A1B: Maximum air spacing in the first lens group G1
（９）νｄｐ１Ａ＞６０
（１０）θｇＦｐ１Ａ−０．６４８３＋０．００１８×νｄｐ１Ａ＞０．００１
但し、
νｄｐ１Ａ：第１Ａレンズ群Ｇ１Ａが有する正レンズのうち、ｄ線に関するアッベ数が最も小さい正レンズのｄ線に関するアッベ数
θｇＦｐ１Ａ：第１Ａレンズ群Ｇ１Ａが有する正レンズのうち、ｄ線に関するアッベ数が最も小さい正レンズのｇ線とＦ線に関する部分分散比 The imaging optical system according to any one of claims 1 to 4, wherein the first A lens group G1A has two positive lenses and satisfies the conditional expression shown below.
(9) νdp1A> 60
(10) θgFp1A-0.6483 + 0.0018 × νdp1A> 0.001
However,
νdp1A: Abbe number for the d-line of the positive lens having the smallest Abbe number for the d-line among the positive lenses of the first A lens group G1A θgFp1A: Abbe number for the d-line among the positive lenses of the first A lens group G1A Partial dispersion ratio for g-line and F-line of the smallest positive lens
（１１）νｄｐ３＞６０
（１２）θｇＦｐ３−０．６４８３＋０．００１８×νｄｐ３＞０．００５
νｄｐ３：前記第３レンズ群Ｇ３が有する少なくとも１枚の正レンズの、ｄ線に関するアッベ数
θｇＦｐ３：前記第３レンズ群Ｇ３が有する少なくとも１枚の正レンズの、ｇ線とＦ線に関する部分分散比 The imaging optical system according to claim 6, wherein the third A lens group G3A has at least one positive lens and at least one negative lens, and satisfies the conditional expression shown below.
(11) νdp3> 60
(12) θgFp3-0.6483 + 0.0018 × νdp3> 0.005
νdp3: Abbe number θgFp3 for d-line of at least one positive lens of the third lens group G3: partial dispersion ratio of at least one positive lens of the third lens group G3 with respect to g-line and F-line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019055800A JP7171048B2 (en) | 2019-03-25 | 2019-03-25 | Imaging optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| JP7547399B2 (en) | 2022-01-01 | 2024-09-09 | キヤノン株式会社 | Optical system and imaging device having the same |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63201623A (en) * | 1987-02-18 | 1988-08-19 | Canon Inc | Photographic lens with vibration preventing function |
| JP2003043348A (en) * | 2001-08-03 | 2003-02-13 | Canon Inc | Optical system having vibration-proof function |
| JP2010015003A (en) * | 2008-07-04 | 2010-01-21 | Nikon Corp | Variable magnification optical system, optical instrument equipped with the variable magnification optical system, and method for variable magnification of variable magnification optical system |
| JP2012002999A (en) * | 2010-06-16 | 2012-01-05 | Canon Inc | Photographic optical system and imaging device having the same |
| JP2013218266A (en) * | 2012-03-15 | 2013-10-24 | Panasonic Corp | Inner focus lens, interchangeable lens device, and camera system |
| JP2015096915A (en) * | 2013-11-15 | 2015-05-21 | 株式会社タムロン | Inner focus lens and imaging apparatus |
-
2019
- 2019-03-25 JP JP2019055800A patent/JP7171048B2/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63201623A (en) * | 1987-02-18 | 1988-08-19 | Canon Inc | Photographic lens with vibration preventing function |
| JP2003043348A (en) * | 2001-08-03 | 2003-02-13 | Canon Inc | Optical system having vibration-proof function |
| JP2010015003A (en) * | 2008-07-04 | 2010-01-21 | Nikon Corp | Variable magnification optical system, optical instrument equipped with the variable magnification optical system, and method for variable magnification of variable magnification optical system |
| JP2012002999A (en) * | 2010-06-16 | 2012-01-05 | Canon Inc | Photographic optical system and imaging device having the same |
| JP2013218266A (en) * | 2012-03-15 | 2013-10-24 | Panasonic Corp | Inner focus lens, interchangeable lens device, and camera system |
| JP2015096915A (en) * | 2013-11-15 | 2015-05-21 | 株式会社タムロン | Inner focus lens and imaging apparatus |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7547399B2 (en) | 2022-01-01 | 2024-09-09 | キヤノン株式会社 | Optical system and imaging device having the same |
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