JP7106099B2 - Imaging optical system - Google Patents
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本発明は、デジタルカメラ、銀塩カメラ及びビデオカメラ等に最適であり、特に、画角が７２°～９４°程度で、Ｆ値がＦ１．４程度の、結像光学系に関する。 The present invention is most suitable for digital cameras, film cameras, video cameras, etc., and particularly relates to an imaging optical system with an angle of view of about 72° to 94° and an F value of about F1.4.
昨今のデジタルカメラはイメージセンサーが高画素化しているため、特に軸上色収差が補正不足な結像光学系の場合、結像面での像の色付きや、アウトフォーカス部でのボケ像への色付きがより顕著なものとなってしまう。このような問題を解決するためには軸上色収差をより小さくなるよう補正することが重要となる。 Since the image sensors of recent digital cameras have high pixel counts, especially in the case of an imaging optical system that is insufficiently corrected for longitudinal chromatic aberration, the image on the imaging plane is colored, and the blurred image in the out-of-focus area is colored. becomes more prominent. In order to solve such a problem, it is important to correct axial chromatic aberration so as to reduce it.
以下の特許文献において従来の結像光学系が開示されている。 The following patent documents disclose conventional imaging optical systems.
特許文献１では、画角が７１°～８４°程度で、Ｆ値がＦ１．４程度の光学系が開示されている。 Patent Document 1 discloses an optical system having an angle of view of about 71° to 84° and an F value of about F1.4.
また、特許文献２では、画角が７５°程度で、Ｆ値がＦ１．４程度の光学系が開示されている。 Further, Patent Document 2 discloses an optical system having an angle of view of about 75° and an F value of about F1.4.
しかしながら、特許文献１や特許文献２で開示されている結像光学系は、軸上色収差補正が不十分である。 However, the imaging optical systems disclosed in Patent Documents 1 and 2 are insufficient in correction of axial chromatic aberration.
そこで、本発明は、従来の結像光学系の課題を解決し、軸上色収差が良好に補正され、Ｆ値がＦ１．４程度の結像光学系を提供することを目的とする。 SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to solve the problems of conventional imaging optical systems and to provide an imaging optical system in which axial chromatic aberration is well corrected and the F value is approximately F1.4.
上記の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、正の屈折力を有する第１レンズ群Ｌ１と、正の屈折力を有する第２レンズ群Ｌ２と、からなり、前記第１レンズ群Ｌ１は、２つ以上の接合レンズを有し、前記接合レンズは全て、物体側から像側へ順に、負レンズ素子と正レンズ素子とで構成され、前記第２レンズ群Ｌ２は、開口絞りＳを含み、フォーカシングに際して、前記第２レンズ群Ｌ２が物体側に移動するとともに、前記第１レンズ群Ｌ１が像面に対して固定であり、以下の条件式（１）を満足し、前記第２レンズ群Ｌ２は、前記開口絞りＳより物体側に少なくとも１枚の正レンズ素子を有し、少なくとも１枚の前記正レンズ素子が以下の条件式（４）（５）を満足することを特徴とした。
０．００９０ ＜ ΔＰｇｆＬ２ｆｐ （５）
但し、
Ａｃｉは以下の式で表される。
Ａｃｉ ＝ φｃｐｉ／νｄｃｐｉ ＋ φｃｍｉ／νｄｃｍｉ
φｃｐｉは、前記第１レンズ群Ｌ１に含まれる物体側からｉ番目の接合レンズの正レンズ素子の屈折力、
νｄｃｐｉは、前記第１レンズ群Ｌ１に含まれる物体側からｉ番目の接合レンズの正レンズ素子のアッベ数、
φｃｍｉは、前記第１レンズ群Ｌ１に含まれる物体側からｉ番目の接合レンズの負レンズ素子の屈折力、
νｄｃｍｉは、前記第１レンズ群Ｌ１に含まれる物体側からｉ番目の接合レンズの負レンズ素子のアッベ数である。
νｄＬ２ｆｐは前記正レンズ素子のアッベ数νｄ、
ＰｇｆＬ２ｆｐは前記正レンズ素子のｇ線とＦ線に関する部分分散比Ｐｇｆである。
ΔＰｇｆＬ２ｆｐは前記正レンズ素子の異常分散性であり、以下の式で表される。
ΔＰｇｆＬ２ｆｐ ＝ ＰｇｆＬ２ｆｐ ＋ ０．００１８×νｄＬ２ｆｐ － ０．６４８３３
In order to solve the above problems, the imaging optical system of the present invention comprises, in order from the object side to the image side, a first lens unit L1 having positive refractive power and a second lens unit L2 having positive refractive power. and the first lens unit L1 has two or more cemented lenses, and all of the cemented lenses are composed of a negative lens element and a positive lens element in order from the object side to the image side, and The second lens group L2 includes an aperture diaphragm S, and during focusing, the second lens group L2 moves toward the object side, and the first lens group L1 is fixed with respect to the image plane. (1) is satisfied , the second lens unit L2 has at least one positive lens element on the object side of the aperture stop S, and the at least one positive lens element has the following conditional expression (4): It is characterized by satisfying (5).
0.0090<ΔPgfL2fp (5)
however,
Aci is represented by the following formula.
Aci = φcpi/νdcpi + φcmi/νdcmi
φcpi is the refractive power of the positive lens element of the i-th cemented lens from the object side included in the first lens unit L1;
νdcpi is the Abbe number of the positive lens element of the i-th cemented lens from the object side included in the first lens unit L1;
φcmi is the refractive power of the negative lens element of the i-th cemented lens from the object side included in the first lens group L1;
νdcmi is the Abbe number of the negative lens element of the i-th cemented lens from the object side included in the first lens unit L1.
νdL2fp is the Abbe number νd of the positive lens element;
PgfL2fp is the partial dispersion ratio Pgf for the g-line and the F-line of the positive lens element.
ΔPgfL2fp is the anomalous dispersion of the positive lens element and is expressed by the following equation.
ΔPgfL2fp=PgfL2fp+0.0018×νdL2fp−0.64833
また、第２の発明は、第１の発明においてさらに、前記接合レンズが以下の条件式を同時に満足することを特徴とした。
φｃｐ／νｄｃｐ ＋ φｃｍ／νｄｃｍ ＞ ０ （２）
φｃ′ｐ／νｄｃ′ｐ ＋ φｃ′ｍ／νｄｃ′ｍ ＜ ０ （３）
但し、
φｃｐは、前記第１レンズ群Ｌ１に含まれる前記接合レンズの正レンズ素子の屈折力、
νｄｃｐは、前記第１レンズ群Ｌ１に含まれる前記接合レンズの正レンズ素子のアッベ数、
φｃｍは、前記第１レンズ群Ｌ１に含まれる前記接合レンズの負レンズ素子の屈折力、
νｄｃｍは、前記第１レンズ群Ｌ１に含まれる前記接合レンズの負レンズ素子のアッベ数、
φｃ′ｐは、前記第１レンズ群Ｌ１に含まれる前記接合レンズで条件式（２）を満足する接合レンズ以外の接合レンズの正レンズ素子の屈折力、
νｄｃ′ｐは、前記第１レンズ群Ｌ１に含まれる前記接合レンズで条件式（２）を満足する接合レンズ以外の接合レンズの正レンズ素子のアッベ数、
φｃ′ｍは、前記第１レンズ群Ｌ１に含まれる前記接合レンズで条件式（２）を満足する接合レンズ以外の接合レンズの負レンズ素子の屈折力、
νｄｃ′ｍは、前記第１レンズ群Ｌ１に含まれる前記接合レンズで条件式（２）を満足する接合レンズ以外の接合レンズの負レンズ素子のアッベ数である。
A second invention is characterized in that, in the first invention, the cemented lens satisfies the following conditional expressions at the same time.
φcp/νdcp + φcm/νdcm > 0 (2)
φc′p/νdc′p + φc′m/νdc′m < 0 (3)
however,
φcp is the refractive power of the positive lens element of the cemented lens included in the first lens group L1;
νdcp is the Abbe number of the positive lens element of the cemented lens included in the first lens unit L1;
φ cm is the refractive power of the negative lens element of the cemented lens included in the first lens group L1;
νdcm is the Abbe number of the negative lens element of the cemented lens included in the first lens unit L1;
φc'p is the refractive power of the positive lens element of the cemented lens other than the cemented lens that satisfies conditional expression (2) among the cemented lenses included in the first lens unit L1;
νdc'p is the Abbe number of the positive lens element of the cemented lens included in the first lens unit L1 and other than the cemented lens that satisfies conditional expression (2);
φc′m is the refractive power of the negative lens element of the cemented lens other than the cemented lens that satisfies conditional expression (2) among the cemented lenses included in the first lens unit L1;
νdc′m is the Abbe number of the negative lens element of the cemented lens other than the cemented lens that satisfies the conditional expression (2) among the cemented lenses included in the first lens unit L1.
また、第３の発明は、第１又は第２の発明においてさらに、前記第２レンズ群Ｌ２は、負の屈折力の３枚接合レンズＬ２ｃを少なくとも１つ有し、前記接合レンズＬ２ｃは、物体側から像側へ順に、正レンズ素子と負レンズ素子と正レンズ素子とで構成され、以下の条件式を満足することを特徴とした。
｜ＡＬ２ｃ｜ ＜ ０．００２０ （６）
ＰｇｆＬ２ｃｍは、前記接合レンズＬ２ｃに含まれる負レンズ素子の部分分散比であり、
ＡＬ２ｃは以下の式で表される。
ＡＬ２ｃ ＝ φＬ２ｃｐ１／νｄＬ２ｃｐ１ ＋ φＬ２ｃｍ１／νｄＬ２ｃｍ１ ＋ φＬ２ｃｐ２／νｄＬ２ｃｐ２
但し、
φＬ２ｃｐ１は、前記接合レンズＬ２ｃのうち、最も物体側に配される正レンズ素子の屈折力、
νｄＬ２ｃｐ１は、前記接合レンズＬ２ｃのうち、最も物体側に配される正レンズ素子のアッベ数、
φＬ２ｃｍ１は、前記接合レンズＬ２ｃのうち、負レンズ素子の屈折力、
νｄＬ２ｃｍ１は、前記接合レンズＬ２ｃのうち、負レンズ素子のアッベ数、
φＬ２ｃｐ２は、前記接合レンズＬ２ｃのうち、最も像側に配される正レンズ素子の屈折力、
νｄＬ２ｃｐ２は、前記接合レンズＬ２ｃのうち、最も像側に配される正レンズ素子のアッベ数である。
In a third invention based on the first or second invention, the second lens group L2 further includes at least one triple cemented lens L2c having a negative refractive power, and the cemented lens L2c is an object It is composed of a positive lens element, a negative lens element, and a positive lens element in order from the image side to the image side, and is characterized by satisfying the following conditional expression.
|AL2c| < 0.0020 (6)
PgfL2cm is the partial dispersion ratio of the negative lens element included in the cemented lens L2c,
AL2c is represented by the following formula.
AL2c = φL2cp1/νdL2cp1 + φL2cm1/νdL2cm1 + φL2cp2/νdL2cp2
however,
φL2cp1 is the refractive power of the positive lens element disposed closest to the object side of the cemented lens L2c;
νdL2cp1 is the Abbe number of the positive lens element disposed closest to the object in the cemented lens L2c;
φL2cm1 is the refractive power of the negative lens element in the cemented lens L2c,
νdL2cm1 is the Abbe number of the negative lens element in the cemented lens L2c,
φL2cp2 is the refractive power of the positive lens element arranged closest to the image side in the cemented lens L2c;
νdL2cp2 is the Abbe number of the positive lens element arranged closest to the image side in the cemented lens L2c.
また、第４の発明は、第１乃至第３の発明においてさらに、前記開口絞りＳの物体側に配される全てのレンズ素子をレンズ群Ｌｓｆとし、前記レンズ群Ｌｓｆは正の屈折力を有し、以下の条件式を満足することを特徴とした。
１．５０ ＜ φ／φｓｆ ＜ ３．８０ （８）
但し、
φは、レンズ全系の無限遠合焦時の屈折力、
φｓｆは、前記レンズ群Ｌｓｆの無限遠合焦時の屈折力である。
In addition, in the fourth invention, in the first to third inventions, all the lens elements arranged on the object side of the aperture stop S are lens groups Lsf, and the lens groups Lsf have positive refractive power. It is characterized by satisfying the following conditional expression.
1.50<φ/φsf<3.80 (8)
however,
φ is the refractive power of the entire lens system when focused at infinity,
φsf is the refractive power of the lens group Lsf when focusing on infinity.
また、第５の発明は、第１乃至第４の発明においてさらに、以下の条件式を満足することを特徴とした。
１．５０ ＜ φ／φ２ ＜ ２．８０ （９）
但し、
φは、レンズ全系の無限遠合焦時の屈折力、
φ２は、前記第２レンズ群Ｌ２の屈折力である。
A fifth invention is characterized in that, in addition to the first to fourth inventions, the following conditional expression is satisfied.
1.50<φ/φ2<2.80 (9)
however,
φ is the refractive power of the entire lens system when focused at infinity,
φ2 is the refractive power of the second lens group L2.
本発明によれば、従来の結像光学系の課題であった軸上色収差を良好に補正し、Ｆ値がＦ１．４程度の結像光学系を提供することができる。 According to the present invention, it is possible to satisfactorily correct longitudinal chromatic aberration, which has been a problem of conventional imaging optical systems, and to provide an imaging optical system with an F value of about F1.4.
以下に、本発明にかかる光学系の実施例について詳細に説明する。なお、以下の実施例の説明は本発明の光学系の一例を説明したものであり、本発明はその要旨を逸脱しない範囲において本実施例に限定されるものではない。 Examples of the optical system according to the present invention will be described in detail below. It should be noted that the following description of the embodiment is an example of the optical system of the present invention, and the present invention is not limited to the present embodiment without departing from the scope of the invention.
本実施例の結像光学系は、物体側から像側へ順に、正の屈折力を有する第１レンズ群Ｌ１と、正の屈折力を有する第２レンズ群Ｌ２と、
からなり、前記第１レンズ群Ｌ１は、２つ以上の接合レンズを有し、前記接合レンズは全て、物体側から像側へ順に、負レンズ素子と正レンズ素子とで構成され、前記第２レンズ群Ｌ２は、開口絞りＳを含み、フォーカシングに際して、前記第２レンズ群Ｌ２が物体側に移動するとともに、前記第１レンズ群Ｌ１が像面に対して固定であり、以下の条件式を満足することを特徴とする。
Ａｃｉは以下の式で表される。
Ａｃｉ ＝ φｃｐｉ／νｄｃｐｉ ＋ φｃｍｉ／νｄｃｍｉ
φｃｐｉは、前記第１レンズ群Ｌ１に含まれる物体側からｉ番目の接合レンズの正レンズ素子の屈折力、
νｄｃｐｉは、前記第１レンズ群Ｌ１に含まれる物体側からｉ番目の接合レンズの正レンズ素子のアッベ数、
φｃｍｉは、前記第１レンズ群Ｌ１に含まれる物体側からｉ番目の接合レンズの負レンズ素子の屈折力、
νｄｃｍｉは、前記第１レンズ群Ｌ１に含まれる物体側からｉ番目の接合レンズの負レンズ素子のアッベ数である。
The imaging optical system of this embodiment includes, in order from the object side to the image side, a first lens group L1 having positive refractive power, a second lens group L2 having positive refractive power,
The first lens unit L1 has two or more cemented lenses, and all of the cemented lenses are composed of a negative lens element and a positive lens element in order from the object side to the image side, and the second The lens group L2 includes an aperture stop S, and when focusing, the second lens group L2 moves toward the object side and the first lens group L1 is fixed with respect to the image plane, satisfying the following conditional expression: characterized by
Aci is represented by the following formula.
Aci = φcpi/νdcpi + φcmi/νdcmi
φcpi is the refractive power of the positive lens element of the i-th cemented lens from the object side included in the first lens unit L1;
νdcpi is the Abbe number of the positive lens element of the i-th cemented lens from the object side included in the first lens unit L1;
φcmi is the refractive power of the negative lens element of the i-th cemented lens from the object side included in the first lens group L1;
νdcmi is the Abbe number of the negative lens element of the i-th cemented lens from the object side included in the first lens unit L1.
なお、Ｆ線、ｄ線、Ｃ線、の屈折率をそれぞれ、ＮＦ、Ｎｄ、ＮＣとした場合、アッベ数νｄは以下の式で表す。
νｄ ＝ （Ｎｄ－１）／（ＮＦ－ＮＣ）
When the refractive indices of the F-line, d-line, and C-line are NF, Nd, and NC, respectively, the Abbe number νd is expressed by the following equation.
νd = (Nd-1)/(NF-NC)
第１レンズ群Ｌ１内に少なくとも２つの接合レンズを配することで、レンズ全系の軸上色収差補正を効果的に行うことができる。 By arranging at least two cemented lenses in the first lens unit L1, longitudinal chromatic aberration correction of the entire lens system can be effectively performed.
条件式（１）は、高性能化のため、第１レンズ群Ｌ１に含まれる接合レンズの１次の色消し条件の和を規定したものである。 Conditional expression (1) defines the sum of primary achromatic conditions of the cemented lens included in the first lens unit L1 for high performance.
条件式（１）の上限値を超え、第１レンズ群Ｌ１に含まれる接合レンズの色消し条件の和が大きくなると、１次の色消しが不十分となるため、軸上色収差が悪化してしまう。 If the sum of the achromatic conditions of the cemented lenses included in the first lens unit L1 exceeds the upper limit of conditional expression (1) and the sum of the achromatic conditions becomes large, the first-order achromatization becomes insufficient, and longitudinal chromatic aberration worsens. put away.
なお、条件式（１）の上限値を０．００１１にすることで、前述の効果をより確実にすることができる。 By setting the upper limit of conditional expression (1) to 0.0011, the above-described effect can be ensured.
さらに、第１レンズ群Ｌ１内の接合レンズが以下の条件式を同時に満足することを特徴とする。
φｃｐ／νｄｃｐ ＋ φｃｍ／νｄｃｍ ＞ ０ （２）
φｃ′ｐ／νｄｃ′ｐ ＋ φｃ′ｍ／νｄｃ′ｍ ＜ ０ （３）
但し、
φｃｐは、前記第１レンズ群Ｌ１に含まれる前記接合レンズの正レンズ素子の屈折力、
νｄｃｐは、前記第１レンズ群Ｌ１に含まれる前記接合レンズの正レンズ素子のアッベ数、
φｃｍは、前記第１レンズ群Ｌ１に含まれる前記接合レンズの負レンズ素子の屈折力、
νｄｃｍは、前記第１レンズ群Ｌ１に含まれる前記接合レンズの負レンズ素子のアッベ数、
φｃ′ｐは、前記第１レンズ群Ｌ１に含まれる前記接合レンズで条件式（２）を満足する接合レンズ以外の接合レンズの正レンズ素子の屈折力、
νｄｃ′ｐは、前記第１レンズ群Ｌ１に含まれる前記接合レンズで条件式（２）を満足する接合レンズ以外の接合レンズの正レンズ素子のアッベ数、
φｃ′ｍは、前記第１レンズ群Ｌ１に含まれる前記接合レンズで条件式（２）を満足する接合レンズ以外の接合レンズの負レンズ素子の屈折力、
νｄｃ′ｍは、前記第１レンズ群Ｌ１に含まれる前記接合レンズで条件式（２）を満足する接合レンズ以外の接合レンズの負レンズ素子のアッベ数である。
Further, the cemented lens in the first lens unit L1 simultaneously satisfies the following conditional expressions.
φcp/νdcp + φcm/νdcm > 0 (2)
φc′p/νdc′p + φc′m/νdc′m < 0 (3)
however,
φcp is the refractive power of the positive lens element of the cemented lens included in the first lens group L1;
νdcp is the Abbe number of the positive lens element of the cemented lens included in the first lens unit L1;
φ cm is the refractive power of the negative lens element of the cemented lens included in the first lens group L1;
νdcm is the Abbe number of the negative lens element of the cemented lens included in the first lens unit L1;
φc'p is the refractive power of the positive lens element of the cemented lens other than the cemented lens that satisfies conditional expression (2) among the cemented lenses included in the first lens unit L1;
νdc'p is the Abbe number of the positive lens element of the cemented lens included in the first lens unit L1 and other than the cemented lens that satisfies conditional expression (2);
φc′m is the refractive power of the negative lens element of the cemented lens other than the cemented lens that satisfies conditional expression (2) among the cemented lenses included in the first lens unit L1;
νdc′m is the Abbe number of the negative lens element of the cemented lens other than the cemented lens that satisfies the conditional expression (2) among the cemented lenses included in the first lens unit L1.
条件式（２）及び（３）は、高性能化のため、第１レンズ群Ｌ１に含まれる接合レンズの１次の色消し条件値の符号を規定したものである。 Conditional expressions (2) and (3) define the sign of the first-order achromatic condition value of the cemented lens included in the first lens unit L1 for high performance.
条件式（２）及び（３）を同時に満足することで、第１レンズ群Ｌ１に含まれる異なる接合レンズ同士間で１次の色消し条件の値を打ち消すことができるため、条件式（１）で規定した第１レンズ群Ｌ１に含まれる接合レンズの１次の色消し条件の和をより効果的に小さくすることができる。これにより、軸上色収差を低減し易くすることができる。 By satisfying the conditional expressions (2) and (3) at the same time, the value of the first-order achromatic condition can be canceled between the different cemented lenses included in the first lens unit L1, so the conditional expression (1) It is possible to effectively reduce the sum of the first-order achromatic conditions of the cemented lenses included in the first lens unit L1 defined in (1). This makes it easier to reduce axial chromatic aberration.
条件式（２）及び（３）を同時に満足しない場合、異なる接合レンズ同士間で１次の色消し条件の値を打ち消すことができない。そのため、条件式（１）を満足するには、条件式（２）及び（３）を同時に満足する場合に比べ、各接合レンズ単体での１次の色消し条件の値を小さくする必要があり、接合レンズを構成するレンズ素子の硝材や屈折力の自由度が制限されてしまう。 If conditional expressions (2) and (3) are not satisfied at the same time, the values of the first-order achromatic conditions cannot be canceled between different cemented lenses. Therefore, in order to satisfy the conditional expression (1), it is necessary to make the value of the first-order achromatic condition for each cemented lens smaller than when the conditional expressions (2) and (3) are satisfied at the same time. In other words, the degree of freedom of the glass material and refractive power of the lens elements constituting the cemented lens is limited.
さらに、前記第２レンズ群Ｌ２は、前記開口絞りＳより物体側に少なくとも１枚の正レンズ素子を有し、少なくとも１枚の前記正レンズ素子が以下の条件式を満足することを特徴とする。
νｄＬ２ｆｐ ＜ ３０ （４）
０．００９０ ＜ ΔＰｇｆＬ２ｆｐ （５）
但し、
νｄＬ２ｆｐは前記正レンズ素子のアッベ数νｄ、
ＰｇｆＬ２ｆｐは前記正レンズ素子のｇ線とＦ線に関する部分分散比Ｐｇｆである。
ΔＰｇｆＬ２ｆｐは前記正レンズ素子の異常分散性であり、以下の式で表される。
ΔＰｇｆＬ２ｆｐ ＝ ＰｇｆＬ２ｆｐ ＋ ０．００１８×νｄＬ２ｆｐ ― ０．６４８３３
Further, the second lens unit L2 has at least one positive lens element on the object side of the aperture stop S, and the at least one positive lens element satisfies the following conditional expression. .
νdL2fp < 30 (4)
0.0090<ΔPgfL2fp (5)
however,
νdL2fp is the Abbe number νd of the positive lens element;
PgfL2fp is the partial dispersion ratio Pgf for the g-line and the F-line of the positive lens element.
ΔPgfL2fp is the anomalous dispersion of the positive lens element and is expressed by the following equation.
ΔPgfL2fp=PgfL2fp+0.0018×νdL2fp−0.64833
条件式（４）及び（５）は、高性能化のため、前記第２レンズ群Ｌ２のうち、前記開口絞りＳより物体側に配される正レンズ素子のアッベ数νｄと異常分散性ΔＰｇｆを規定したものである。 Conditional expressions (4) and (5) are defined by the Abbe number νd and the anomalous dispersion ΔPgf of the positive lens element arranged closer to the object than the aperture stop S in the second lens unit L2 in order to improve the performance. It is stipulated.
なお、ｇ線、Ｆ線、ｄ線、Ｃ線、の屈折率をそれぞれ、Ｎｇ、ＮＦ、Ｎｄ、ＮＣとした場合、部分分散比Ｐｇｆはそれぞれ以下の式で表す。
Ｐｇｆ ＝ （Ｎｇ－ＮＦ）／（ＮＦ－ＮＣ）
When the refractive indices of the g-line, F-line, d-line, and C-line are Ng, NF, Nd, and NC, respectively, the partial dispersion ratio Pgf is expressed by the following equations.
Pgf = (Ng-NF)/(NF-NC)
条件式（４）の上限値を超えると共に条件式（５）の下限値を超え、正レンズ素子Ｌ２ｆｐのアッベ数νｄが大きくなると共に異常分散性ΔＰｇｆが小さくなると、特に、２次スペクトルの補正が不足することで、軸上色収差が悪化してしまう。 When the upper limit of conditional expression (4) is exceeded and the lower limit of conditional expression (5) is exceeded, and the Abbe number νd of the positive lens element L2fp increases and the anomalous dispersion ΔPgf decreases, correction of the secondary spectrum is particularly difficult. If it is insufficient, longitudinal chromatic aberration will be worsened.
なお、条件式（４）の上限値を２４、条件式（５）の下限値を０．０１００にすることで、前述の効果をより確実にすることができる。 By setting the upper limit of conditional expression (4) to 24 and the lower limit of conditional expression (5) to 0.0100, the above effect can be more reliably obtained.
さらに、前記第２レンズ群Ｌ２は負の屈折力の３枚接合レンズＬ２ｃを少なくとも１つ有し、前記接合レンズＬ２ｃは、物体側から像側へ順に、正レンズ素子と負レンズ素子と正レンズ素子とで構成され、以下の条件式を満足することを特徴とする。
｜ＡＬ２ｃ｜＜ ０．００２０ （６）
ＰｇｆＬ２ｃｍは、前記接合レンズＬ２ｃに含まれる負レンズ素子の部分分散比であり、
ＡＬ２ｃは以下の式で表される。
ＡＬ２ｃ＝ φＬ２ｃｐ１／νｄＬ２ｃｐ１ ＋ φＬ２ｃｍ１／νｄＬ２ｃｍ１ ＋ φＬ２ｃｐ２／νｄＬ２ｃｐ２
但し、
φＬ２ｃｐ１は、前記接合レンズＬ２ｃのうち、最も物体側に配される正レンズ素子の屈折力、
νｄＬ２ｃｐ１は、前記接合レンズＬ２ｃのうち、最も物体側に配される正レンズ素子のアッベ数、
φＬ２ｃｍ１は、前記接合レンズＬ２ｃのうち、負レンズ素子の屈折力、
νｄＬ２ｃｍ１は、前記接合レンズＬ２ｃのうち、負レンズ素子のアッベ数、
φＬ２ｃｐ２は、前記接合レンズＬ２ｃのうち、最も像側に配される正レンズ素子の屈折力、
νｄＬ２ｃｐ２は、前記接合レンズＬ２ｃのうち、最も像側に配される正レンズ素子のアッベ数である。
Further, the second lens unit L2 has at least one triplet cemented lens L2c with negative refractive power, and the cemented lens L2c consists of a positive lens element, a negative lens element and a positive lens in order from the object side to the image side. It is characterized by satisfying the following conditional expression.
|AL2c| < 0.0020 (6)
PgfL2cm is the partial dispersion ratio of the negative lens element included in the cemented lens L2c,
AL2c is represented by the following formula.
AL2c = φL2cp1/νdL2cp1 + φL2cm1/νdL2cm1 + φL2cp2/νdL2cp2
however,
φL2cp1 is the refractive power of the positive lens element disposed closest to the object side of the cemented lens L2c;
νdL2cp1 is the Abbe number of the positive lens element disposed closest to the object in the cemented lens L2c;
φL2cm1 is the refractive power of the negative lens element in the cemented lens L2c,
νdL2cm1 is the Abbe number of the negative lens element in the cemented lens L2c,
φL2cp2 is the refractive power of the positive lens element arranged closest to the image side in the cemented lens L2c;
νdL2cp2 is the Abbe number of the positive lens element arranged closest to the image side in the cemented lens L2c.
第２レンズ群Ｌ２に含まれる３枚接合レンズＬ２ｃは、２枚接合レンズに正レンズ素子を追加し３枚接合レンズとすることで、接合レンズ全体としては負の屈折力を保持しつつ、２枚接合時に比べてペッツバール和を小さくすることができる。これによりレンズ全系での像面湾曲補正がし易くなる。またさらに、２次スペクトルの補正を効果的に行うことができるようになるため、軸上色収差補正に有利となる。 The triplet cemented lens L2c included in the second lens group L2 is a triplet cemented lens by adding a positive lens element to the doublet cemented lens. The Petzval sum can be made smaller than when joining the sheets. This facilitates field curvature correction in the entire lens system. Furthermore, since it becomes possible to effectively correct the secondary spectrum, it is advantageous for correction of longitudinal chromatic aberration.
条件式（６）は軸上色収差低減のため、接合レンズＬ２ｃの１次の色消し条件を規定したものである。またさらに、条件式（７）は、軸上色収差低減のため、接合レンズＬ２ｃを構成する正レンズ素子の部分分散比の平均値と負レンズ素子の部分分散比の差を規定したものである。 Conditional expression (6) defines the first-order achromatic condition of the cemented lens L2c in order to reduce longitudinal chromatic aberration. Furthermore, conditional expression (7) defines the difference between the average partial dispersion ratio of the positive lens elements and the partial dispersion ratio of the negative lens elements constituting the cemented lens L2c in order to reduce longitudinal chromatic aberration.
条件式（６）の上限値を超え、接合レンズＬ２ｃの色消し条件値が大きくなると、１次の色消しが不十分となるため、軸上色収差が悪化してしまう。 If the upper limit of conditional expression (6) is exceeded and the achromatic condition value of the cemented lens L2c is increased, the first-order achromatization becomes insufficient, resulting in deterioration of longitudinal chromatic aberration.
条件式（７）の上限値を超え、接合レンズＬ２ｃ含まれる正レンズ素子の部分分散比の平均値と負レンズ素子の部分分散比の差が大きくなると、２次スペクトルの補正が不十分となるため、軸上色収差が悪化してしまう。 If the upper limit of conditional expression (7) is exceeded and the difference between the average partial dispersion ratio of the positive lens elements and the partial dispersion ratio of the negative lens elements included in the cemented lens L2c becomes large, correction of the secondary spectrum becomes insufficient. As a result, axial chromatic aberration becomes worse.
なお、上述した条件式（６）について、その上限値を０．００１５に、また、条件式（７）について上限値を０．０６０にすることで、前述の効果をより確実にすることができる。 By setting the upper limit of conditional expression (6) to 0.0015 and the upper limit of conditional expression (7) to 0.060, the above effect can be more reliably obtained. .
さらに、前記開口絞りＳの物体側に配されるレンズ群をレンズ群Ｌｓｆとし、前記レンズ群Ｌｓｆは正の屈折力を有し、以下の条件式を満足することを特徴とする。
１．５０ ＜ φ／φｓｆ ＜ ３．８０ （８）
但し、
φは、レンズ全系の無限遠合焦時の屈折力、
φｓｆは、前記レンズ群Ｌｓｆの無限遠合焦時の屈折力である。
Further, the lens group arranged on the object side of the aperture stop S is a lens group Lsf, and the lens group Lsf has a positive refractive power and satisfies the following conditional expression.
1.50<φ/φsf<3.80 (8)
however,
φ is the refractive power of the entire lens system when focused at infinity,
φsf is the refractive power of the lens group Lsf when focusing on infinity.
条件式（８）は、小型化と高性能化のため、前記レンズ群Ｌｓｆの屈折力を規定したものである。 Conditional expression (8) defines the refractive power of the lens group Lsf for miniaturization and high performance.
条件式（８）の上限値を超え、レンズ群Ｌｓｆの屈折力が弱くなると、開口絞りＳでのＦ値光束径が増大するため、Ｆ値を維持しようとした場合に、絞り径が増大し、絞りユニット径の増大、ひいては製品径の増大に繋がり、小型化に不利となる。 When the upper limit of conditional expression (8) is exceeded and the refractive power of the lens unit Lsf becomes weak, the diameter of the F-number luminous flux at the aperture stop S increases. , leading to an increase in the diameter of the diaphragm unit and, in turn, an increase in the diameter of the product, which is disadvantageous for miniaturization.
条件式（８）の下限値を超え、レンズ群Ｌｓｆの屈折力が強くなると、開口絞りＳでのＦ値光束径は減少するため、絞りユニット径が減少し、小型化には有利になる。一方、主にレンズ群Ｌｓｆで発生する像面湾曲が悪化し、これをレンズ全系で良好に補正することが困難となるため、高性能化に不利となる。 When the lower limit of conditional expression (8) is exceeded and the refractive power of the lens group Lsf becomes strong, the diameter of the F-number luminous flux at the aperture stop S decreases, so the diameter of the stop unit decreases, which is advantageous for miniaturization. On the other hand, the curvature of field, which mainly occurs in the lens unit Lsf, becomes worse, and it becomes difficult to satisfactorily correct this in the entire lens system, which is disadvantageous in achieving high performance.
なお、条件式（８）下限値を１．６０、上限値を３．４０にすることで、前述の効果をより確実にすることができる。 By setting the lower limit value of conditional expression (8) to 1.60 and the upper limit value to 3.40, the above effect can be ensured.
さらに、以下の条件式を満足することを特徴とする。
１．５０ ＜ φ／φ２ ＜ ２．８０ （９）
但し、
φは、レンズ全系の無限遠合焦時の屈折力、
φ２は、前記第２レンズ群Ｌ２の屈折力である。
Furthermore, it is characterized by satisfying the following conditional expressions.
1.50<φ/φ2<2.80 (9)
however,
φ is the refractive power of the entire lens system when focused at infinity,
φ2 is the refractive power of the second lens group L2.
条件式（９）は、高性能化と小型化のため、第２レンズ群Ｌ２の屈折力を規定したものである。 Conditional expression (9) defines the refractive power of the second lens unit L2 for high performance and compactness.
条件式（９）の下限値を超え、第２レンズ群Ｌ２の屈折力が強くなると、フォーカシングに際する移動量が小さくなるため、小型化には有利になるが、フォーカシングに際する非点収差や球面収差等、諸収差の変動が増大するだけでなく、製造誤差敏感度が大きくなるため、高性能化に不利となる。 If the lower limit of conditional expression (9) is exceeded and the refractive power of the second lens unit L2 becomes stronger, the amount of movement during focusing becomes smaller, which is advantageous for miniaturization, but astigmatism during focusing. , spherical aberration, etc., and the sensitivity to manufacturing errors increases, which is disadvantageous for achieving high performance.
条件式（９）の上限値を超え、第２レンズ群Ｌ２の屈折力が弱くなると、フォーカシングに際する諸収差の変動は軽減するため、高性能化には有利になるが、フォーカシングに際する移動量が増大するため、小型化には不利となる。 If the upper limit of conditional expression (9) is exceeded and the refracting power of the second lens unit L2 is weakened, fluctuations in various aberrations during focusing are reduced, which is advantageous for high performance. Since the amount of movement increases, it is disadvantageous for miniaturization.
なお、上述した条件式（９）について、その下限値を１．６０、また上限値を２．４０にすることで、前述の効果をより確実にすることができる。 By setting the lower limit value of conditional expression (9) to 1.60 and the upper limit value thereof to 2.40, the above effect can be more reliably obtained.
以下、本発明にかかる結像光学系の実施例１乃至７の数値データを示す。 Numerical data of Examples 1 to 7 of the imaging optical system according to the present invention are 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λ＝５８７．５６ｎｍ）に対する屈折率、νｄはｄ線に対するアッベ数を示す。また、ＢＦはバックフォーカスを表し、空気の屈折率ｎ＝１．００００はその記載を省略する。 In [Surface data], the surface number is the number of the lens surface or aperture stop 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 d line (wavelength λ = 587.56 nm) A refractive index and νd indicate the Abbe number for the d-line. Also, BF represents back focus, and the description of the refractive index n=1.0000 of air is omitted.
面番号を付した（絞り）には、平面または開口絞りに対する曲率半径∞（無限大）を記入している。 The surface numbered (aperture) indicates the radius of curvature ∞ (infinity) with respect to a plane or an aperture stop.
［非球面データ］には［面データ］において＊を付したレンズ面の非球面形状を与える各係数値を示している。非球面の形状は、光軸に直交する方向への変位をｙ、非球面と光軸の交点から光軸方向への変位（サグ量）をｚ、コーニック係数をＫ、４、６、８、１０、１２次の非球面係数をそれぞれＡ４、Ａ６、Ａ８、Ａ１０、Ａ１２と置くとき、非球面の座標が以下の式で表わされるものとする。 [Aspheric surface data] shows each coefficient value that gives the aspheric shape of the lens surface marked with * in [Surface data]. As for the shape of the aspherical surface, y is the displacement in the direction orthogonal to the optical axis, z is the displacement (sag amount) in the optical axis direction from the intersection of the aspherical surface and the optical axis, and K, 4, 6, 8 is the conic coefficient. Let A4, A6, A8, A10, and A12 be the 10th and 12th order aspherical coefficients, respectively, and the coordinates of the aspherical surface are represented by the following equations.
［各種データ］には、各焦点距離状態における焦点距離等の値を示している。 [Various data] shows values such as the focal length in each focal length state.
［可変間隔データ］には、各焦点距離状態における可変間隔及びＢＦ（バックフォーカス）の値を示している。 [Variable distance data] shows the variable distance and BF (back focus) values in each focal length state.
［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] indicates the number of the surface closest to the object side constituting each lens group and the combined 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 addition, in the values of all the specifications below, unless otherwise specified, millimeters (mm) are used for the focal length f, radius of curvature r, distance between lens surfaces d, and other lengths. The system is not limited to this because the same optical performance can be obtained in both proportional enlargement 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。 Also, a list of corresponding values of conditional expressions in each of these embodiments 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、ΔＳ、ΔＭ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。さらに図１、６、１１、１６、２１、２６、３１に示すレンズ構成図において、Ｓは開口絞り、Ｉは像面、ＬＰＦはローパスフィルター、中心を通る一点鎖線は光軸である。 In the aberration diagrams corresponding to each example, d, g, and C represent the d-line, g-line, and C-line, respectively, and .DELTA.S and .DELTA.M represent the sagittal image plane and the meridional image plane, respectively. 1, 6, 11, 16, 21, 26, and 31, S is an aperture stop, I is an image plane, LPF is a low-pass filter, and a dashed line passing through the center is an optical axis.
図１は、実施例１に係る結像光学系の無限遠におけるレンズ構成図である。実施例１の結像光学系は、物体側から像側へ順に、フォーカシング時に固定の正の屈折力を有する第１レンズ群Ｌ１と、フォーカシング時に物体側に移動し正の屈折力を有する第２レンズ群Ｌ２とから構成される。 FIG. 1 is a lens configuration diagram of an imaging optical system according to Example 1 at infinity. The imaging optical system of Example 1 includes, in order from the object side to the image side, a first lens unit L1 having a fixed positive refractive power during focusing and a second lens unit L1 having a positive refractive power that moves toward the object side during focusing. and a lens group L2.
第１レンズ群Ｌ１は、物体側から像側へ順に、物体側に凸面を向けた凹メニスカスレンズと、Ｒ１面とＲ２面両面が非球面で物体側に凸面を向けた凹メニスカスレンズと、物体側に凹面を向けた凸メニスカスレンズと、両凹レンズと両凸レンズの接合レンズと、両凹レンズと両凸レンズの接合レンズと、両凸レンズとから構成される。 The first lens unit L1 includes, in order from the object side to the image side, a concave meniscus lens with a convex surface facing the object side, a concave meniscus lens with both surfaces R1 and R2 having aspherical surfaces and a convex surface facing the object side, and an object lens. It consists of a convex meniscus lens with a concave surface on the side, a cemented lens of a biconcave lens and a biconvex lens, a cemented lens of a biconcave lens and a biconvex lens, and a biconvex lens.
第２レンズ群Ｌ２は、物体側から像側へ順に、Ｒ１面とＲ２面両面が非球面の両凸レンズと、両凸レンズと両凹レンズの接合レンズと、開口絞りＳと、物体側に凹面を向けた凸メニスカスレンズと物体側に凹面を向けた凹メニスカスレンズと物体側に凹面を向けた凸メニスカスレンズとの３枚接合レンズと、両凸レンズと、Ｒ１面とＲ２面両面が非球面で物体側に凹面を向けた凸メニスカスレンズとから構成される。 The second lens unit L2 includes, in order from the object side to the image side, a biconvex lens in which both surfaces R1 and R2 are aspheric, a cemented lens composed of a biconvex lens and a biconcave lens, an aperture stop S, and a concave surface facing the object side. a triple cemented lens consisting of a convex meniscus lens with a concave surface facing the object side, a concave meniscus lens with a concave surface facing the object side, and a convex meniscus lens with a concave surface facing the object side; a biconvex lens; It is composed of a convex meniscus lens with a concave surface facing toward.
続いて、以下に実施例１に係る結像光学系の諸元値を示す。 Next, the specification values of the imaging optical system according to Example 1 are shown below.
数値実施例1
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ (d0)
1 53.4749 2.3408 1.77250 49.62
2 27.5945 7.7901
3* 29.5724 2.4000 1.58913 61.25
4* 16.2027 21.2312
5 -136.8641 3.9575 1.77250 49.62
6 -49.2678 1.1941
7 -39.8952 1.7000 1.49700 81.61
8 70.9259 5.5173 1.91082 35.25
9 -84.3707 2.6708
10 -43.7633 1.5001 1.85025 30.05
11 26.4118 7.8197 1.72916 54.67
12 -136.5673 0.2500
13 48.6668 5.3624 1.84666 23.78
14 -236.4311 d14
15* 90.0894 4.9824 1.77250 49.50
16* -62.7008 0.1500
17 220.3760 3.2473 1.84666 23.78
18 -96.1980 1.1000 1.73800 32.33
19 29.7541 5.2694
20(絞り) ∞ 7.0592
21 -42.6299 6.6374 1.43700 95.10
22 -14.9350 1.0000 1.73800 32.33
23 -195.3434 3.1938 1.59282 68.63
24 -50.6823 0.1500
25 67.9179 9.8729 1.49700 81.61
26 -25.9219 0.1500
27* -45.4031 2.6766 1.77250 49.47
28* -31.2521 d28
29 ∞ 1.4500 1.52301 58.59
30 ∞ BF
像面 ∞
[非球面データ]
3面 4面 15面
K 0.0000 -1.0000 0.0000
A4 -1.1390E-05 -2.7150E-06 -8.5665E-07
A6 5.4962E-09 -1.1948E-08 -1.7530E-09
A8 -9.6831E-12 4.7094E-11 8.1494E-12
A10 0.0000E+00 -1.3842E-13 3.0132E-15
A12 0.0000E+00 1.2548E-16 0.0000E+00
16面 27面 28面
K 0.0000 0.0000 0.0000
A4 4.8448E-06 -2.1308E-05 -1.0105E-05
A6 -5.3211E-09 1.0902E-08 1.3472E-08
A8 9.5752E-12 -2.3912E-10 -1.8227E-10
A10 -2.5306E-15 4.7523E-13 3.7010E-13
A12 0.0000E+00 0.0000E+00 0.0000E+00
[各種データ]
INF
焦点距離 20.70
Fナンバー 1.47
全画角2ω 94.26
像高Y 21.63
レンズ全長 152.53
[可変間隔データ]
INF 撮影距離953mm
d0 ∞ 800.4343
d14 4.3469 3.8142
d28 36.5102 37.0429
BF 1.0000 1.0000
[レンズ群データ]
群 始面 焦点距離
L1 1 118.45
L2 15 45.91
Lsf 1 66.80
Numerical example 1
Unit: mm
[Surface data]
Face number rd nd vd
Object plane ∞ (d0)
1 53.4749 2.3408 1.77250 49.62
2 27.5945 7.7901
3* 29.5724 2.4000 1.58913 61.25
4* 16.2027 21.2312
5 -136.8641 3.9575 1.77250 49.62
6 -49.2678 1.1941
7 -39.8952 1.7000 1.49700 81.61
8 70.9259 5.5173 1.91082 35.25
9 -84.3707 2.6708
10 -43.7633 1.5001 1.85025 30.05
11 26.4118 7.8197 1.72916 54.67
12 -136.5673 0.2500
13 48.6668 5.3624 1.84666 23.78
14-236.4311 d14
15* 90.0894 4.9824 1.77250 49.50
16* -62.7008 0.1500
17 220.3760 3.2473 1.84666 23.78
18 -96.1980 1.1000 1.73800 32.33
19 29.7541 5.2694
20 (Aperture) ∞ 7.0592
21 -42.6299 6.6374 1.43700 95.10
22 -14.9350 1.0000 1.73800 32.33
23 -195.3434 3.1938 1.59282 68.63
24 -50.6823 0.1500
25 67.9179 9.8729 1.49700 81.61
26 -25.9219 0.1500
27* -45.4031 2.6766 1.77250 49.47
28* -31.2521 d28
29 ∞ 1.4500 1.52301 58.59
30∞BF
Image plane ∞
[Aspheric data]
3 sides 4 sides 15 sides
K 0.0000 -1.0000 0.0000
A4 -1.1390E-05 -2.7150E-06 -8.5665E-07
A6 5.4962E-09 -1.1948E-08 -1.7530E-09
A8 -9.6831E-12 4.7094E-11 8.1494E-12
A10 0.0000E+00 -1.3842E-13 3.0132E-15
A12 0.0000E+00 1.2548E-16 0.0000E+00
16 faces 27 faces 28 faces
K 0.0000 0.0000 0.0000
A4 4.8448E-06 -2.1308E-05 -1.0105E-05
A6 -5.3211E-09 1.0902E-08 1.3472E-08
A8 9.5752E-12 -2.3912E-10 -1.8227E-10
A10 -2.5306E-15 4.7523E-13 3.7010E-13
A12 0.0000E+00 0.0000E+00 0.0000E+00
[Various data]
INF
Focal length 20.70
F number 1.47
Full angle of view 2ω 94.26
Image height Y 21.63
Lens length 152.53
[Variable interval data]
INF Shooting distance 953mm
d0 ∞ 800.4343
d14 4.3469 3.8142
d28 36.5102 37.0429
BF 1.0000 1.0000
[Lens group data]
Group Starting surface Focal length
L1 1 118.45
L2 15 45.91
Lsf 1 66.80
図６は、実施例２に係る結像光学系の無限遠におけるレンズ構成図である。実施例２の結像光学系は、物体側から像側へ順に、フォーカシング時に固定の正の屈折力を有する第１レンズ群Ｌ１と、フォーカシング時に物体側に移動し正の屈折力を有する第２レンズ群Ｌ２とから構成される。 FIG. 6 is a lens configuration diagram of the imaging optical system according to Example 2 at infinity. The imaging optical system of Example 2 includes, in order from the object side to the image side, a first lens unit L1 having a fixed positive refractive power during focusing and a second lens unit L1 having a positive refractive power that moves toward the object side during focusing. and a lens group L2.
第１レンズ群Ｌ１は、物体側から像側へ順に、物体側に凸面を向けた凹メニスカスレンズと、Ｒ１面とＲ２面両面が非球面で物体側に凸面を向けた凹メニスカスレンズと、両凸レンズと、両凹レンズと両凸レンズの接合レンズと、両凹レンズと両凸レンズの接合レンズと、両凸レンズとから構成される。 The first lens unit L1 includes, in order from the object side to the image side, a concave meniscus lens with a convex surface facing the object side, and a concave meniscus lens with both surfaces R1 and R2 having aspherical surfaces and a convex surface facing the object side. It consists of a convex lens, a cemented lens of a biconcave lens and a biconvex lens, a cemented lens of a biconcave lens and a biconvex lens, and a biconvex lens.
第２レンズ群Ｌ２は、物体側から像側へ順に、Ｒ１面とＲ２面両面が非球面の両凸レンズと、両凸レンズと両凹レンズの接合レンズと、開口絞りＳと、物体側に凹面を向けた凸メニスカスレンズと両凹レンズと両凸レンズとの３枚接合レンズＬ２ｃと、両凸レンズと、Ｒ１面とＲ２面両面が非球面で物体側に凹面を向けた凸メニスカスレンズとから構成される。 The second lens unit L2 includes, in order from the object side to the image side, a biconvex lens in which both surfaces R1 and R2 are aspheric, a cemented lens composed of a biconvex lens and a biconcave lens, an aperture stop S, and a concave surface facing the object side. A triple cemented lens L2c consisting of a convex meniscus lens, a biconcave lens, and a biconvex lens, a biconvex lens, and a convex meniscus lens having both surfaces R1 and R2 aspheric and concave toward the object side.
続いて、以下に実施例２に係る結像光学系の諸元値を示す。 Next, the specification values of the imaging optical system according to Example 2 are shown below.
数値実施例2
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ (d0)
1 42.6657 1.9000 1.77250 49.62
2 22.8995 8.5583
3* 38.3333 2.4000 1.49710 81.56
4* 19.2526 8.7434
5 278.5124 3.3670 1.85478 24.80
6 -139.9988 3.9263
7 -37.2551 1.7000 1.49700 81.61
8 67.1430 6.2229 1.91082 35.25
9 -80.5816 1.5661
10 -63.9954 1.5000 1.85478 24.80
11 34.6073 7.8360 1.59282 68.63
12 -103.1843 3.8780
13 53.9119 5.5666 1.90366 31.32
14 -375.5120 d14
15* 264.4779 4.0349 1.88202 37.22
16* -77.3746 0.1500
17 146.7616 5.3028 1.84666 23.78
18 -55.1442 1.1000 1.73800 32.33
19 42.0650 4.7092
20(絞り) ∞ 4.0693
21 -48.9249 8.3301 1.43700 95.10
22 -18.2490 1.0000 1.73800 32.33
23 49.7510 5.9436 1.59282 68.63
24 -94.0091 0.1500
25 59.8943 9.5878 1.59282 68.63
26 -34.5739 3.9360
27* -63.6600 2.4583 1.77250 49.50
28* -39.9714 d28
29 ∞ 1.4500 1.52301 58.59
30 ∞ BF
像面 ∞
[非球面データ]
3面 4面 15面
K 0.0000 -1.0000 0.0000
A4 -4.4298E-07 -4.9531E-07 5.2261E-07
A6 1.6875E-09 -4.4836E-09 9.4980E-10
A8 6.3740E-12 -2.5171E-11 -6.2182E-12
A10 0.0000E+00 1.0175E-13 3.2821E-14
A12 0.0000E+00 -2.1236E-16 0.0000E+00
16面 27面 28面
K 0.0000 0.0000 0.0000
A4 2.9534E-06 -1.6336E-05 -7.6523E-06
A6 -1.4551E-09 -1.8624E-08 -1.4413E-08
A8 -7.6519E-13 -5.6588E-11 -3.9912E-11
A10 2.5510E-14 1.9222E-13 1.5418E-13
A12 0.0000E+00 0.0000E+00 0.0000E+00
[各種データ]
INF
焦点距離 24.80
Fナンバー 1.47
全画角2ω 83.34
像高Y 21.63
レンズ全長 152.51
[可変間隔データ]
INF 撮影距離1119mm
d0 ∞ 966.5632
d14 5.6134 4.9812
d28 36.5100 37.1422
BF 1.0000 1.0000
[レンズ群データ]
群 始面 焦点距離
L1 1 171.66
L2 15 49.78
Lsf 1 55.69
Numerical example 2
Unit: mm
[Surface data]
Face number rd nd vd
Object plane ∞ (d0)
1 42.6657 1.9000 1.77250 49.62
2 22.8995 8.5583
3* 38.3333 2.4000 1.49710 81.56
4* 19.2526 8.7434
5 278.5124 3.3670 1.85478 24.80
6 -139.9988 3.9263
7 -37.2551 1.7000 1.49700 81.61
8 67.1430 6.2229 1.91082 35.25
9 -80.5816 1.5661
10 -63.9954 1.5000 1.85478 24.80
11 34.6073 7.8360 1.59282 68.63
12 -103.1843 3.8780
13 53.9119 5.5666 1.90366 31.32
14-375.5120 d14
15* 264.4779 4.0349 1.88202 37.22
16* -77.3746 0.1500
17 146.7616 5.3028 1.84666 23.78
18 -55.1442 1.1000 1.73800 32.33
19 42.0650 4.7092
20 (Aperture) ∞ 4.0693
21 -48.9249 8.3301 1.43700 95.10
22 -18.2490 1.0000 1.73800 32.33
23 49.7510 5.9436 1.59282 68.63
24 -94.0091 0.1500
25 59.8943 9.5878 1.59282 68.63
26 -34.5739 3.9360
27* -63.6600 2.4583 1.77250 49.50
28* -39.9714 d28
29 ∞ 1.4500 1.52301 58.59
30∞BF
Image plane ∞
[Aspheric data]
3 sides 4 sides 15 sides
K 0.0000 -1.0000 0.0000
A4 -4.4298E-07 -4.9531E-07 5.2261E-07
A6 1.6875E-09 -4.4836E-09 9.4980E-10
A8 6.3740E-12 -2.5171E-11 -6.2182E-12
A10 0.0000E+00 1.0175E-13 3.2821E-14
A12 0.0000E+00 -2.1236E-16 0.0000E+00
16 faces 27 faces 28 faces
K 0.0000 0.0000 0.0000
A4 2.9534E-06 -1.6336E-05 -7.6523E-06
A6 -1.4551E-09 -1.8624E-08 -1.4413E-08
A8 -7.6519E-13 -5.6588E-11 -3.9912E-11
A10 2.5510E-14 1.9222E-13 1.5418E-13
A12 0.0000E+00 0.0000E+00 0.0000E+00
[Various data]
INF
Focal length 24.80
F number 1.47
Full angle of view 2ω 83.34
Image height Y 21.63
Lens length 152.51
[Variable interval data]
INF shooting distance 1119mm
d0 ∞ 966.5632
d14 5.6134 4.9812
d28 36.5100 37.1422
BF 1.0000 1.0000
[Lens group data]
Group Starting surface Focal length
L1 1 171.66
L2 15 49.78
Lsf 1 55.69
図１１は、実施例３に係る結像光学系の無限遠におけるレンズ構成図である。実施例３の結像光学系は、物体側から像側へ順に、フォーカシング時に固定の正の屈折力を有する第１レンズ群Ｌ１と、フォーカシング時に物体側に移動し正の屈折力を有する第２レンズ群Ｌ２とから構成される。 FIG. 11 is a lens configuration diagram of the imaging optical system according to Example 3 at infinity. The imaging optical system of Example 3 comprises, in order from the object side to the image side, a first lens unit L1 having a fixed positive refractive power during focusing and a second lens unit L1 having a positive refractive power that moves toward the object side during focusing. and a lens group L2.
第１レンズ群Ｌ１は、物体側から像側へ順に、物体側に凸面を向けた凹メニスカスレンズと、Ｒ１面とＲ２面両面が非球面で物体側に凸面を向けた凹メニスカスレンズと、両凸レンズと、両凹レンズと両凸レンズの接合レンズと、両凹レンズと両凸レンズの接合レンズと、両凸レンズとから構成される。 The first lens unit L1 includes, in order from the object side to the image side, a concave meniscus lens with a convex surface facing the object side, and a concave meniscus lens with both surfaces R1 and R2 having aspherical surfaces and a convex surface facing the object side. It is composed of a convex lens, a cemented lens of a biconcave lens and a biconvex lens, a cemented lens of a biconcave lens and a biconvex lens, and a biconvex lens.
第２レンズ群Ｌ２は、物体側から像側へ順に、両凸レンズと、Ｒ１面とＲ２面両面が非球面の両凸レンズと、両凸レンズと両凹レンズの接合レンズと、開口絞りＳと、物体側に凹面を向けた凸メニスカスレンズと両凹レンズと両凸レンズとの３枚接合レンズＬ２ｃと、両凸レンズと、Ｒ１面とＲ２面両面が非球面で物体側に凹面を向けた凸メニスカスレンズとから構成される。 The second lens unit L2 includes, in order from the object side to the image side, a biconvex lens, a biconvex lens in which both surfaces R1 and R2 are aspheric, a cemented lens of a biconvex lens and a biconcave lens, an aperture stop S, and an object side lens. Constructed of a triplet cemented lens L2c consisting of a convex meniscus lens with a concave surface facing upward, a biconcave lens, and a biconvex lens L2c, a biconvex lens, and a convex meniscus lens with both surfaces R1 and R2 having aspherical surfaces and concave surfaces facing the object side. be done.
続いて、以下に実施例３に係る結像光学系の諸元値を示す。 Next, the specification values of the imaging optical system according to Example 3 are shown below.
数値実施例3
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ (d0)
1 48.0651 1.9000 1.76385 48.49
2 25.4960 9.1253
3* 55.2369 2.4000 1.59201 67.02
4* 24.2885 7.2278
5 223.6627 3.8007 1.91082 35.25
6 -139.9982 4.0139
7 -40.4092 1.7000 1.49700 81.61
8 94.1778 6.6641 1.91082 35.25
9 -68.7374 2.4945
10 -45.3983 1.5000 1.73800 32.33
11 29.9643 9.4843 1.61997 63.88
12 -365.2249 0.2500
13 59.6766 7.3739 1.80420 46.50
14 -101.7896 d14
15 83.0947 4.5999 1.77250 49.62
16 -204.8076 0.1489
17* 189.2058 2.7314 1.88202 37.22
18* -259.0589 0.1500
19 249.0484 5.2515 1.94595 17.98
20 -50.9436 1.1000 1.80518 25.46
21 36.5588 5.0575
22(絞り) ∞ 4.9913
23 -38.4110 7.4087 1.43700 95.10
24 -17.8239 1.0000 1.73800 32.33
25 113.4447 3.2521 1.59282 68.63
26 -186.0674 0.1500
27 69.4137 9.2429 1.59282 68.63
28 -28.7374 0.1500
29* -63.6682 3.4000 1.76802 49.24
30* -39.4280 d30
31 ∞ 1.4500 1.52301 58.59
32 ∞ BF
像面 ∞
[非球面データ]
3面 4面 17面
K 0.0000 -1.0000 0.0000
A4 -3.3407E-06 -4.1324E-06 -1.3952E-06
A6 7.2687E-09 1.3754E-09 -5.4192E-09
A8 -6.1564E-12 3.5885E-12 -2.0446E-11
A10 0.0000E+00 -2.8503E-14 4.9685E-14
A12 0.0000E+00 7.1075E-18 0.0000E+00
18面 29面 30面
K 0.0000 0.0000 0.0000
A4 1.4159E-06 -1.7948E-05 -8.6298E-06
A6 -8.6100E-09 -1.6767E-08 -1.0088E-08
A8 -1.0466E-11 -3.2632E-11 -1.8291E-11
A10 4.2104E-14 1.3700E-13 1.0494E-13
A12 0.0000E+00 0.0000E+00 0.0000E+00
[各種データ]
INF
焦点距離 28.59
Fナンバー 1.46
全画角2ω 74.99
像高Y 21.63
レンズ全長 152.51
[可変間隔データ]
INF 撮影距離1271mm
d0 ∞ 1118.5395
d14 6.9812 6.2507
d30 36.5101 37.2406
BF 1.0000 1.0000
[レンズ群データ]
群 始面 焦点距離
L1 1 186.95
L2 15 54.21
Lsf 1 50.34
Numerical example 3
Unit: mm
[Surface data]
Face number rd nd vd
Object plane ∞ (d0)
1 48.0651 1.9000 1.76385 48.49
2 25.4960 9.1253
3* 55.2369 2.4000 1.59201 67.02
4* 24.2885 7.2278
5 223.6627 3.8007 1.91082 35.25
6 -139.9982 4.0139
7 -40.4092 1.7000 1.49700 81.61
8 94.1778 6.6641 1.91082 35.25
9 -68.7374 2.4945
10 -45.3983 1.5000 1.73800 32.33
11 29.9643 9.4843 1.61997 63.88
12 -365.2249 0.2500
13 59.6766 7.3739 1.80420 46.50
14 -101.7896 d14
15 83.0947 4.5999 1.77250 49.62
16 -204.8076 0.1489
17* 189.2058 2.7314 1.88202 37.22
18* -259.0589 0.1500
19 249.0484 5.2515 1.94595 17.98
20 -50.9436 1.1000 1.80518 25.46
21 36.5588 5.0575
22 (Aperture) ∞ 4.9913
23 -38.4110 7.4087 1.43700 95.10
24 -17.8239 1.0000 1.73800 32.33
25 113.4447 3.2521 1.59282 68.63
26 -186.0674 0.1500
27 69.4137 9.2429 1.59282 68.63
28 -28.7374 0.1500
29* -63.6682 3.4000 1.76802 49.24
30* -39.4280 d30
31 ∞ 1.4500 1.52301 58.59
32∞BF
Image plane ∞
[Aspheric data]
3 sides 4 sides 17 sides
K 0.0000 -1.0000 0.0000
A4 -3.3407E-06 -4.1324E-06 -1.3952E-06
A6 7.2687E-09 1.3754E-09 -5.4192E-09
A8 -6.1564E-12 3.5885E-12 -2.0446E-11
A10 0.0000E+00 -2.8503E-14 4.9685E-14
A12 0.0000E+00 7.1075E-18 0.0000E+00
18 faces 29 faces 30 faces
K 0.0000 0.0000 0.0000
A4 1.4159E-06 -1.7948E-05 -8.6298E-06
A6 -8.6100E-09 -1.6767E-08 -1.0088E-08
A8 -1.0466E-11 -3.2632E-11 -1.8291E-11
A10 4.2104E-14 1.3700E-13 1.0494E-13
A12 0.0000E+00 0.0000E+00 0.0000E+00
[Various data]
INF
Focal length 28.59
F number 1.46
Full angle of view 2ω 74.99
Image height Y 21.63
Lens length 152.51
[Variable interval data]
INF shooting distance 1271mm
d0 ∞ 1118.5395
d14 6.9812 6.2507
d30 36.5101 37.2406
BF 1.0000 1.0000
[Lens group data]
Group Starting surface Focal length
L1 1 186.95
L2 15 54.21
Lsf 1 50.34
図１６は、実施例４に係る結像光学系の無限遠におけるレンズ構成図である。実施例４の結像光学系は、物体側から像側へ順に、フォーカシング時に固定の正の屈折力を有する第１レンズ群Ｌ１と、フォーカシング時に物体側に移動し正の屈折力を有する第２レンズ群Ｌ２とから構成される。 FIG. 16 is a lens configuration diagram of the imaging optical system according to Example 4 at infinity. The imaging optical system of Example 4 comprises, in order from the object side to the image side, a first lens unit L1 having a fixed positive refractive power during focusing and a second lens unit L1 having a positive refractive power that moves toward the object side during focusing. and a lens group L2.
第１レンズ群Ｌ１は、物体側から像側へ順に、物体側に凸面を向けた凹メニスカスレンズと、Ｒ１面とＲ２面両面が非球面で物体側に凸面を向けた凹メニスカスレンズと、両凸レンズと、両凹レンズと両凸レンズの接合レンズと、両凹レンズと両凸レンズの接合レンズと、両凸レンズとから構成される。 The first lens unit L1 includes, in order from the object side to the image side, a concave meniscus lens with a convex surface facing the object side, and a concave meniscus lens with both surfaces R1 and R2 having aspherical surfaces and a convex surface facing the object side. It is composed of a convex lens, a cemented lens of a biconcave lens and a biconvex lens, a cemented lens of a biconcave lens and a biconvex lens, and a biconvex lens.
第２レンズ群Ｌ２は、物体側から像側へ順に、両凸レンズと、Ｒ１面とＲ２面両面が非球面の両凸レンズと、両凸レンズと両凹レンズの接合レンズと、開口絞りＳと、物体側に凹面を向けた凸メニスカスレンズと両凹レンズと両凸レンズとの３枚接合レンズＬ２ｃと、両凸レンズと、Ｒ１面とＲ２面両面が非球面で物体側に凹面を向けた凸メニスカスレンズとから構成される。 The second lens unit L2 includes, in order from the object side to the image side, a biconvex lens, a biconvex lens in which both surfaces R1 and R2 are aspheric, a cemented lens of a biconvex lens and a biconcave lens, an aperture stop S, and an object side lens. Constructed of a triplet cemented lens L2c consisting of a convex meniscus lens with a concave surface facing upward, a biconcave lens, and a biconvex lens L2c, a biconvex lens, and a convex meniscus lens with both surfaces R1 and R2 having aspherical surfaces and concave surfaces facing the object side. be done.
続いて、以下に実施例４に係る結像光学系の諸元値を示す。 Next, the specification values of the imaging optical system according to Example 4 are shown below.
数値実施例4
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ (d0)
1 40.3177 1.9000 1.76385 48.49
2 25.7126 7.5974
3* 44.2156 2.4000 1.59201 67.02
4* 20.5178 8.4195
5 264.0942 3.5009 1.91082 35.25
6 -139.9958 2.5184
7 -52.5311 1.7000 1.45860 90.20
8 147.2965 4.2924 1.91082 35.25
9 -101.0200 2.9144
10 -46.8652 1.5000 1.78472 25.72
11 27.8321 8.6177 1.67300 38.26
12 -366.2456 0.2500
13 57.4848 6.4522 1.91082 35.25
14 -106.9221 d14
15 147.6181 3.3163 1.77250 49.62
16 -191.4821 0.1500
17* 129.6377 2.5087 1.90270 31.00
18* -1000.0000 0.1500
19 144.7154 4.8929 1.92286 20.88
20 -56.5434 1.1000 1.73800 32.33
21 28.5414 5.5297
22(絞り) ∞ 4.0957
23 -42.9190 8.6221 1.43700 95.10
24 -16.7511 1.0000 1.73800 32.33
25 66.6742 6.4832 1.59282 68.63
26 -51.0243 0.1500
27 80.2726 9.7613 1.59282 68.63
28 -31.6434 0.6771
29* -51.2206 3.4000 1.76802 49.24
30* -36.9659 d30
31 ∞ 1.4500 1.52301 58.59
32 ∞ BF
像面 ∞
[非球面データ]
3面 4面 17面
K 0.0000 -1.0000 0.0000
A4 -4.7779E-06 -2.2050E-06 -3.9461E-06
A6 3.1498E-09 -2.7099E-09 -1.0961E-08
A8 -4.4913E-12 -3.2222E-12 -1.7534E-11
A10 0.0000E+00 -1.6124E-14 8.1668E-14
A12 0.0000E+00 8.8775E-18 0.0000E+00
18面 29面 30面
K 0.0000 0.0000 0.0000
A4 -1.2500E-06 -1.1731E-05 -4.5517E-06
A6 -1.3843E-08 -7.5844E-09 -4.4807E-09
A8 -1.3501E-12 -1.9037E-11 -1.2108E-11
A10 6.2566E-14 3.5850E-14 2.9970E-14
A12 0.0000E+00 0.0000E+00 0.0000E+00
[各種データ]
INF
焦点距離 28.43
Fナンバー 1.46
全画角2ω 75.30
像高Y 21.63
レンズ全長 152.52
[可変間隔データ]
INF 撮影距離1261mm
d0 ∞ 1108.5202
d14 6.8207 6.0907
d30 39.3494 40.0794
BF 1.0000 1.0000
[レンズ群データ]
群 始面 焦点距離
L1 1 166.83
L2 15 48.39
Lsf 1 84.96
Numerical example 4
Unit: mm
[Surface data]
Face number rd nd vd
Object plane ∞ (d0)
1 40.3177 1.9000 1.76385 48.49
2 25.7126 7.5974
3* 44.2156 2.4000 1.59201 67.02
4* 20.5178 8.4195
5 264.0942 3.5009 1.91082 35.25
6 -139.9958 2.5184
7 -52.5311 1.7000 1.45860 90.20
8 147.2965 4.2924 1.91082 35.25
9 -101.0200 2.9144
10 -46.8652 1.5000 1.78472 25.72
11 27.8321 8.6177 1.67300 38.26
12 -366.2456 0.2500
13 57.4848 6.4522 1.91082 35.25
14 -106.9221 d14
15 147.6181 3.3163 1.77250 49.62
16 -191.4821 0.1500
17* 129.6377 2.5087 1.90270 31.00
18* -1000.0000 0.1500
19 144.7154 4.8929 1.92286 20.88
20 -56.5434 1.1000 1.73800 32.33
21 28.5414 5.5297
22 (Aperture) ∞ 4.0957
23 -42.9190 8.6221 1.43700 95.10
24 -16.7511 1.0000 1.73800 32.33
25 66.6742 6.4832 1.59282 68.63
26 -51.0243 0.1500
27 80.2726 9.7613 1.59282 68.63
28 -31.6434 0.6771
29* -51.2206 3.4000 1.76802 49.24
30* -36.9659 d30
31 ∞ 1.4500 1.52301 58.59
32∞BF
Image plane ∞
[Aspheric Data]
3 sides 4 sides 17 sides
K 0.0000 -1.0000 0.0000
A4 -4.7779E-06 -2.2050E-06 -3.9461E-06
A6 3.1498E-09 -2.7099E-09 -1.0961E-08
A8 -4.4913E-12 -3.2222E-12 -1.7534E-11
A10 0.0000E+00 -1.6124E-14 8.1668E-14
A12 0.0000E+00 8.8775E-18 0.0000E+00
18 faces 29 faces 30 faces
K 0.0000 0.0000 0.0000
A4 -1.2500E-06 -1.1731E-05 -4.5517E-06
A6 -1.3843E-08 -7.5844E-09 -4.4807E-09
A8 -1.3501E-12 -1.9037E-11 -1.2108E-11
A10 6.2566E-14 3.5850E-14 2.9970E-14
A12 0.0000E+00 0.0000E+00 0.0000E+00
[Various data]
INF
Focal length 28.43
F number 1.46
Full angle of view 2ω 75.30
Image height Y 21.63
Lens length 152.52
[Variable interval data]
INF shooting distance 1261mm
d0 ∞ 1108.5202
d14 6.8207 6.0907
d30 39.3494 40.0794
BF 1.0000 1.0000
[Lens group data]
Group Starting surface Focal length
L1 1 166.83
L2 15 48.39
Lsf 1 84.96
図２１は、実施例５に係る結像光学系の無限遠におけるレンズ構成図である。実施例５の結像光学系は、物体側から像側へ順に、フォーカシング時に固定の正の屈折力を有する第１レンズ群Ｌ１と、フォーカシング時に物体側に移動し正の屈折力を有する第２レンズ群Ｌ２とから構成される。 FIG. 21 is a lens configuration diagram of the imaging optical system according to Example 5 at infinity. The imaging optical system of Example 5 comprises, in order from the object side to the image side, a first lens unit L1 having a fixed positive refractive power during focusing, and a second lens unit L1 moving toward the object side during focusing and having positive refractive power. and a lens group L2.
第１レンズ群Ｌ１は、物体側から像側へ順に、物体側に凸面を向けた凹メニスカスレンズと、Ｒ１面とＲ２面両面が非球面で物体側に凸面を向けた凹メニスカスレンズと、両凸レンズと、両凹レンズと両凸レンズの接合レンズと、両凹レンズと両凸レンズの接合レンズと、両凸レンズとから構成される。 The first lens unit L1 includes, in order from the object side to the image side, a concave meniscus lens with a convex surface facing the object side, and a concave meniscus lens with both surfaces R1 and R2 having aspherical surfaces and a convex surface facing the object side. It is composed of a convex lens, a cemented lens of a biconcave lens and a biconvex lens, a cemented lens of a biconcave lens and a biconvex lens, and a biconvex lens.
第２レンズ群Ｌ２は、物体側から像側へ順に、両凸レンズと、Ｒ１面とＲ２面両面が非球面の両凸レンズと、両凸レンズと両凹レンズの接合レンズと、開口絞りＳと、物体側に凹面を向けた凸メニスカスレンズと両凹レンズと両凸レンズとの３枚接合レンズＬ２ｃと、両凸レンズと、Ｒ１面とＲ２面両面が非球面で物体側に凹面を向けた凸メニスカスレンズとから構成される。 The second lens unit L2 includes, in order from the object side to the image side, a biconvex lens, a biconvex lens in which both surfaces R1 and R2 are aspheric, a cemented lens of a biconvex lens and a biconcave lens, an aperture stop S, and an object side lens. Constructed of a triplet cemented lens L2c consisting of a convex meniscus lens with a concave surface facing upwards, a biconcave lens, and a biconvex lens, a biconvex lens, and a convex meniscus lens with both surfaces R1 and R2 being aspherical and concave toward the object side. be done.
続いて、以下に実施例５に係る結像光学系の諸元値を示す。 Next, the specification values of the imaging optical system according to Example 5 are shown below.
数値実施例5
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ (d0)
1 45.9977 1.9000 1.76385 48.49
2 25.1338 9.4070
3* 56.5779 2.4000 1.59201 67.02
4* 24.7684 7.4494
5 471.3973 3.3291 1.95375 32.32
6 -140.0067 3.8048
7 -41.9847 1.7000 1.43700 95.10
8 100.5258 6.3247 1.91082 35.25
9 -72.3098 2.6764
10 -44.8985 1.5000 1.73800 32.33
11 31.9074 8.8575 1.59282 68.63
12 -387.2246 0.2500
13 61.5260 7.5947 1.80420 46.50
14 -89.3001 d14
15 72.1665 4.2559 1.76385 48.49
16 -958.4060 0.1500
17* 119.0382 3.6213 1.76802 49.24
18* -149.1866 0.1500
19 333.2382 4.3554 1.92286 20.88
20 -63.2930 1.1000 1.73800 32.33
21 30.9770 5.5835
22(絞り) ∞ 4.9652
23 -39.6314 7.4855 1.45860 90.20
24 -17.8628 1.0000 1.73800 32.33
25 168.2052 3.2768 1.49700 81.61
26 -118.1115 0.7368
27 72.6269 8.5694 1.59282 68.63
28 -31.7540 0.2466
29* -76.1964 3.4000 1.76802 49.24
30* -41.4083 d30
31 ∞ 1.4500 1.52301 58.59
32 ∞ BF
像面 ∞
[非球面データ]
3面 4面 17面
K 0.0000 -1.0000 0.0000
A4 -3.9398E-06 -4.3891E-06 -2.1535E-06
A6 8.2421E-09 1.3317E-09 -9.2600E-10
A8 -8.6736E-12 8.3525E-12 -2.1205E-11
A10 0.0000E+00 -5.3271E-14 6.6801E-14
A12 0.0000E+00 3.4710E-17 0.0000E+00
18面 29面 30面
K 0.0000 0.0000 0.0000
A4 1.6303E-06 -7.6843E-06 -3.6277E-07
A6 -4.1954E-09 -7.4072E-09 -3.7194E-09
A8 -6.8591E-12 6.8616E-11 5.8130E-11
A10 5.1181E-14 -9.0126E-14 -5.9129E-14
A12 0.0000E+00 0.0000E+00 0.0000E+00
[各種データ]
INF
焦点距離 28.72
Fナンバー 1.46
全画角2ω 74.75
像高Y 21.63
レンズ全長 152.06
[可変間隔データ]
INF 撮影距離1275mm
d0 ∞ 1122.9079
d14 6.9915 6.2577
d30 36.5288 37.2626
BF 1.0000 1.0000
[レンズ群データ]
群 始面 焦点距離
L1 1 186.69
L2 15 54.14
Lsf 1 53.19
Numerical example 5
Unit: mm
[Surface data]
Face number rd nd vd
Object plane ∞ (d0)
1 45.9977 1.9000 1.76385 48.49
2 25.1338 9.4070
3* 56.5779 2.4000 1.59201 67.02
4* 24.7684 7.4494
5 471.3973 3.3291 1.95375 32.32
6 -140.0067 3.8048
7 -41.9847 1.7000 1.43700 95.10
8 100.5258 6.3247 1.91082 35.25
9 -72.3098 2.6764
10 -44.8985 1.5000 1.73800 32.33
11 31.9074 8.8575 1.59282 68.63
12 -387.2246 0.2500
13 61.5260 7.5947 1.80420 46.50
14 -89.3001 d14
15 72.1665 4.2559 1.76385 48.49
16 -958.4060 0.1500
17* 119.0382 3.6213 1.76802 49.24
18* -149.1866 0.1500
19 333.2382 4.3554 1.92286 20.88
20 -63.2930 1.1000 1.73800 32.33
21 30.9770 5.5835
22 (Aperture) ∞ 4.9652
23 -39.6314 7.4855 1.45860 90.20
24 -17.8628 1.0000 1.73800 32.33
25 168.2052 3.2768 1.49700 81.61
26 -118.1115 0.7368
27 72.6269 8.5694 1.59282 68.63
28 -31.7540 0.2466
29* -76.1964 3.4000 1.76802 49.24
30* -41.4083 d30
31 ∞ 1.4500 1.52301 58.59
32∞BF
Image plane ∞
[Aspheric data]
3 sides 4 sides 17 sides
K 0.0000 -1.0000 0.0000
A4 -3.9398E-06 -4.3891E-06 -2.1535E-06
A6 8.2421E-09 1.3317E-09 -9.2600E-10
A8 -8.6736E-12 8.3525E-12 -2.1205E-11
A10 0.0000E+00 -5.3271E-14 6.6801E-14
A12 0.0000E+00 3.4710E-17 0.0000E+00
18 faces 29 faces 30 faces
K 0.0000 0.0000 0.0000
A4 1.6303E-06 -7.6843E-06 -3.6277E-07
A6 -4.1954E-09 -7.4072E-09 -3.7194E-09
A8 -6.8591E-12 6.8616E-11 5.8130E-11
A10 5.1181E-14 -9.0126E-14 -5.9129E-14
A12 0.0000E+00 0.0000E+00 0.0000E+00
[Various data]
INF
Focal length 28.72
F number 1.46
Full angle of view 2ω 74.75
Image height Y 21.63
Lens length 152.06
[Variable interval data]
INF shooting distance 1275mm
d0 ∞ 1122.9079
d14 6.9915 6.2577
d30 36.5288 37.2626
BF 1.0000 1.0000
[Lens group data]
Group Starting surface Focal length
L1 1 186.69
L2 15 54.14
Lsf 1 53.19
図２６は、実施例６に係る結像光学系の無限遠におけるレンズ構成図である。実施例６の結像光学系は、物体側から像側へ順に、フォーカシング時に固定の正の屈折力を有する第１レンズ群Ｌ１と、フォーカシング時に物体側に移動し正の屈折力を有する第２レンズ群Ｌ２とから構成される。 FIG. 26 is a lens configuration diagram of the imaging optical system according to Example 6 at infinity. The imaging optical system of Example 6 comprises, in order from the object side to the image side, a first lens unit L1 having a fixed positive refractive power during focusing, and a second lens unit L1 moving toward the object side during focusing and having positive refractive power. and a lens group L2.
第１レンズ群Ｌ１は、物体側から像側へ順に、物体側に凸面を向けた凹メニスカスレンズと、Ｒ１面とＲ２面両面が非球面で物体側に凸面を向けた凹メニスカスレンズと、両凸レンズと、両凹レンズと両凸レンズの接合レンズと、両凹レンズと両凸レンズの接合レンズと、両凸レンズとから構成される。 The first lens unit L1 includes, in order from the object side to the image side, a concave meniscus lens with a convex surface facing the object side, and a concave meniscus lens with both surfaces R1 and R2 having aspherical surfaces and a convex surface facing the object side. It consists of a convex lens, a cemented lens of a biconcave lens and a biconvex lens, a cemented lens of a biconcave lens and a biconvex lens, and a biconvex lens.
第２レンズ群Ｌ２は、物体側から像側へ順に、両凸レンズと、Ｒ１面とＲ２面両面が非球面の両凸レンズと、両凸レンズと両凹レンズの接合レンズと、開口絞りＳと、物体側に凹面を向けた凸メニスカスレンズと両凹レンズと両凸レンズとの３枚接合レンズＬ２ｃと、両凸レンズと、Ｒ１面とＲ２面両面が非球面で物体側に凹面を向けた凸メニスカスレンズとから構成される。 The second lens unit L2 includes, in order from the object side to the image side, a biconvex lens, a biconvex lens in which both surfaces R1 and R2 are aspheric, a cemented lens of a biconvex lens and a biconcave lens, an aperture stop S, and an object side lens. Constructed of a triplet cemented lens L2c consisting of a convex meniscus lens with a concave surface facing upward, a biconcave lens, and a biconvex lens L2c, a biconvex lens, and a convex meniscus lens with both surfaces R1 and R2 having aspherical surfaces and concave surfaces facing the object side. be done.
続いて、以下に実施例６に係る結像光学系の諸元値を示す。 Next, the specification values of the imaging optical system according to Example 6 are shown below.
数値実施例6
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ (d0)
1 47.3207 1.9000 1.76385 48.49
2 25.1370 8.4554
3* 46.9543 2.4000 1.59201 67.02
4* 23.2091 8.1561
5 618.4976 3.2330 1.95375 32.32
6 -139.9990 4.0127
7 -40.5659 1.7000 1.43700 95.10
8 94.3906 6.6136 1.91082 35.25
9 -70.5544 2.4296
10 -46.9968 1.5000 1.73800 32.33
11 32.1175 8.6744 1.59282 68.63
12 -544.2563 0.2500
13 60.1374 7.5297 1.80420 46.50
14 -94.6982 d14
15 69.9167 4.3560 1.76385 48.49
16 -904.2656 0.1500
17* 112.6199 3.6175 1.76802 49.24
18* -158.1655 0.1500
19 385.7929 4.1192 1.92286 20.88
20 -67.3866 1.1000 1.73800 32.33
21 30.2728 5.6940
22(絞り) ∞ 5.1548
23 -40.6450 7.8692 1.49700 81.61
24 -17.6592 1.0000 1.72047 34.71
25 89.6119 4.1610 1.49700 81.61
26 -102.4644 0.1500
27 67.2593 8.6087 1.59282 68.63
28 -32.5264 0.1500
29* -74.3568 3.4000 1.76802 49.24
30* -43.9446 d30
31 ∞ 1.4500 1.52301 58.59
32 ∞ BF
像面 ∞
[非球面データ]
3面 4面 17面
K 0.0000 -1.0000 0.0000
A4 -5.1231E-06 -4.8891E-06 -2.6581E-06
A6 1.0612E-08 3.7734E-09 -1.9882E-09
A8 -9.9412E-12 9.3013E-12 -1.8211E-11
A10 0.0000E+00 -5.7662E-14 5.9593E-14
A12 0.0000E+00 3.3125E-17 0.0000E+00
18面 29面 30面
K 0.0000 0.0000 0.0000
A4 1.0964E-06 -7.2907E-06 -3.3343E-07
A6 -4.7729E-09 -9.4121E-09 -6.1575E-09
A8 -3.7791E-12 8.7358E-11 7.6511E-11
A10 4.3214E-14 -1.2811E-13 -9.5067E-14
A12 0.0000E+00 0.0000E+00 0.0000E+00
[各種データ]
INF
焦点距離 28.70
Fナンバー 1.46
全画角2ω 74.78
像高Y 21.63
レンズ全長 152.51
[可変間隔データ]
INF 撮影距離1275mm
d0 ∞ 1122.6885
d14 7.0149 6.2814
d30 36.5101 37.2436
BF 1.0000 1.0000
[レンズ群データ]
群 始面 焦点距離
L1 1 186.32
L2 15 54.03
Lsf 1 56.03
Numerical example 6
Unit: mm
[Surface data]
Face number rd nd vd
Object plane ∞ (d0)
1 47.3207 1.9000 1.76385 48.49
2 25.1370 8.4554
3* 46.9543 2.4000 1.59201 67.02
4* 23.2091 8.1561
5 618.4976 3.2330 1.95375 32.32
6 -139.9990 4.0127
7 -40.5659 1.7000 1.43700 95.10
8 94.3906 6.6136 1.91082 35.25
9 -70.5544 2.4296
10 -46.9968 1.5000 1.73800 32.33
11 32.1175 8.6744 1.59282 68.63
12 -544.2563 0.2500
13 60.1374 7.5297 1.80420 46.50
14 -94.6982 d14
15 69.9167 4.3560 1.76385 48.49
16 -904.2656 0.1500
17* 112.6199 3.6175 1.76802 49.24
18* -158.1655 0.1500
19 385.7929 4.1192 1.92286 20.88
20 -67.3866 1.1000 1.73800 32.33
21 30.2728 5.6940
22 (Aperture) ∞ 5.1548
23 -40.6450 7.8692 1.49700 81.61
24 -17.6592 1.0000 1.72047 34.71
25 89.6119 4.1610 1.49700 81.61
26 -102.4644 0.1500
27 67.2593 8.6087 1.59282 68.63
28 -32.5264 0.1500
29* -74.3568 3.4000 1.76802 49.24
30* -43.9446 d30
31 ∞ 1.4500 1.52301 58.59
32∞BF
Image plane ∞
[Aspheric data]
3 sides 4 sides 17 sides
K 0.0000 -1.0000 0.0000
A4 -5.1231E-06 -4.8891E-06 -2.6581E-06
A6 1.0612E-08 3.7734E-09 -1.9882E-09
A8 -9.9412E-12 9.3013E-12 -1.8211E-11
A10 0.0000E+00 -5.7662E-14 5.9593E-14
A12 0.0000E+00 3.3125E-17 0.0000E+00
18 faces 29 faces 30 faces
K 0.0000 0.0000 0.0000
A4 1.0964E-06 -7.2907E-06 -3.3343E-07
A6 -4.7729E-09 -9.4121E-09 -6.1575E-09
A8 -3.7791E-12 8.7358E-11 7.6511E-11
A10 4.3214E-14 -1.2811E-13 -9.5067E-14
A12 0.0000E+00 0.0000E+00 0.0000E+00
[Various data]
INF
Focal length 28.70
F number 1.46
Full angle of view 2ω 74.78
Image height Y 21.63
Lens length 152.51
[Variable interval data]
INF shooting distance 1275mm
d0 ∞ 1122.6885
d14 7.0149 6.2814
d30 36.5101 37.2436
BF 1.0000 1.0000
[Lens group data]
Group Starting surface Focal length
L1 1 186.32
L2 15 54.03
Lsf 1 56.03
図３１は、実施例７に係る結像光学系の無限遠におけるレンズ構成図である。実施例７の結像光学系は、物体側から像側へ順に、フォーカシング時に固定の正の屈折力を有する第１レンズ群Ｌ１と、フォーカシング時に物体側に移動し正の屈折力を有する第２レンズ群Ｌ２とから構成される。 FIG. 31 is a lens configuration diagram of the imaging optical system according to Example 7 at infinity. The imaging optical system of Example 7 comprises, in order from the object side to the image side, a first lens unit L1 having a fixed positive refractive power during focusing, and a second lens unit L1 moving toward the object side during focusing and having positive refractive power. and a lens group L2.
第１レンズ群Ｌ１は、物体側から像側へ順に、物体側に凸面を向けた凹メニスカスレンズと、Ｒ１面とＲ２面両面が非球面で物体側に凸面を向けた凹メニスカスレンズと、両凸レンズと、物体側に凹面を向けた凹メニスカスレンズと物体側に凹面を向けた凸メニスカスレンズの接合レンズと、両凹レンズと両凸レンズの接合レンズと、両凸レンズとから構成される。 The first lens unit L1 includes, in order from the object side to the image side, a concave meniscus lens with a convex surface facing the object side, and a concave meniscus lens with both surfaces R1 and R2 having aspherical surfaces and a convex surface facing the object side. It consists of a convex lens, a cemented lens of a concave meniscus lens with a concave surface facing the object side and a convex meniscus lens with a concave surface facing the object side, a cemented lens of a biconcave lens and a biconvex lens, and a biconvex lens.
第２レンズ群Ｌ２は、物体側から像側へ順に、両凸レンズと、Ｒ１面とＲ２面両面が非球面の両凸レンズと、両凸レンズと両凹レンズの接合レンズと、開口絞りＳと、物体側に凹面を向けた凸メニスカスレンズと両凹レンズと両凸レンズとの３枚接合レンズＬ２ｃと、両凸レンズと、Ｒ１面とＲ２面両面が非球面で物体側に凹面を向けた凸メニスカスレンズとから構成される。 The second lens unit L2 includes, in order from the object side to the image side, a biconvex lens, a biconvex lens in which both surfaces R1 and R2 are aspheric, a cemented lens of a biconvex lens and a biconcave lens, an aperture stop S, and an object side lens. Constructed of a triplet cemented lens L2c consisting of a convex meniscus lens with a concave surface facing upwards, a biconcave lens, and a biconvex lens, a biconvex lens, and a convex meniscus lens with both surfaces R1 and R2 being aspherical and concave toward the object side. be done.
続いて、以下に実施例７に係る結像光学系の諸元値を示す。 Next, the specification values of the imaging optical system according to Example 7 are shown below.
数値実施例7
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ (d0)
1 58.1029 1.9000 1.49700 81.61
2 25.8323 7.2193
3* 43.8421 2.4000 1.49710 81.56
4* 22.0018 8.6381
5 192.3206 3.3668 1.91082 35.25
6 -203.9976 3.6511
7 -44.3384 1.7000 1.45860 90.20
8 -541.7426 3.0629 1.91082 35.25
9 -89.2131 2.6893
10 -48.4573 1.5000 1.74077 27.76
11 31.0147 8.8448 1.64000 60.08
12 -184.2732 0.2500
13 62.0439 6.5390 1.91082 35.25
14 -116.2143 d14
15 127.7060 3.1356 1.77250 49.62
16 -575.1914 0.1500
17* 89.9200 3.1227 1.90270 31.00
18* -1000.0000 0.1500
19 182.1987 5.2105 1.92286 20.88
20 -53.1299 1.1000 1.73800 32.33
21 28.8535 5.7797
22(絞り) ∞ 3.8979
23 -50.8188 8.1716 1.43700 95.10
24 -18.3608 1.0000 1.73800 32.33
25 57.3244 6.2597 1.59282 68.63
26 -63.7403 0.1500
27 76.7803 9.2815 1.59282 68.63
28 -33.2081 1.4684
29* -53.8051 3.4000 1.76802 49.24
30* -37.8796 d30
31 ∞ 1.4500 1.52301 58.59
32 ∞ BF
像面 ∞
[非球面データ]
3面 4面 17面
K 0.0000 -1.0000 0.0000
A4 3.0045E-06 5.2317E-06 -3.4789E-06
A6 -6.2605E-09 -5.4397E-09 -9.3009E-09
A8 8.9736E-12 -1.9937E-11 -1.8154E-11
A10 0.0000E+00 7.0849E-14 3.5896E-14
A12 0.0000E+00 -6.9098E-17 0.0000E+00
18面 29面 30面
K 0.0000 0.0000 0.0000
A4 -8.7973E-07 -1.2297E-05 -5.3524E-06
A6 -1.1780E-08 -4.4775E-09 -2.5556E-09
A8 -3.2855E-12 -2.9605E-11 -1.9302E-11
A10 2.1332E-14 5.0434E-14 3.8201E-14
A12 0.0000E+00 0.0000E+00 0.0000E+00
[各種データ]
INF
焦点距離 30.28
Fナンバー 1.47
全画角2ω 72.18
像高Y 21.63
レンズ全長 152.52
[可変間隔データ]
INF 撮影距離1335mm
d0 ∞ 1182.9464
d14 7.5525 6.7750
d30 38.4785 39.2560
BF 1.0000 1.0000
[レンズ群データ]
群 始面 焦点距離
L1 1 177.70
L2 15 51.53
Lsf 1 81.41
Numerical example 7
Unit: mm
[Surface data]
Face number rd nd vd
Object plane ∞ (d0)
1 58.1029 1.9000 1.49700 81.61
2 25.8323 7.2193
3* 43.8421 2.4000 1.49710 81.56
4* 22.0018 8.6381
5 192.3206 3.3668 1.91082 35.25
6 -203.9976 3.6511
7 -44.3384 1.7000 1.45860 90.20
8 -541.7426 3.0629 1.91082 35.25
9 -89.2131 2.6893
10 -48.4573 1.5000 1.74077 27.76
11 31.0147 8.8448 1.64000 60.08
12 -184.2732 0.2500
13 62.0439 6.5390 1.91082 35.25
14 -116.2143 d14
15 127.7060 3.1356 1.77250 49.62
16 -575.1914 0.1500
17* 89.9200 3.1227 1.90270 31.00
18* -1000.0000 0.1500
19 182.1987 5.2105 1.92286 20.88
20 -53.1299 1.1000 1.73800 32.33
21 28.8535 5.7797
22 (Aperture) ∞ 3.8979
23 -50.8188 8.1716 1.43700 95.10
24 -18.3608 1.0000 1.73800 32.33
25 57.3244 6.2597 1.59282 68.63
26 -63.7403 0.1500
27 76.7803 9.2815 1.59282 68.63
28 -33.2081 1.4684
29* -53.8051 3.4000 1.76802 49.24
30* -37.8796 d30
31 ∞ 1.4500 1.52301 58.59
32∞BF
Image plane ∞
[Aspheric data]
3 sides 4 sides 17 sides
K 0.0000 -1.0000 0.0000
A4 3.0045E-06 5.2317E-06 -3.4789E-06
A6 -6.2605E-09 -5.4397E-09 -9.3009E-09
A8 8.9736E-12 -1.9937E-11 -1.8154E-11
A10 0.0000E+00 7.0849E-14 3.5896E-14
A12 0.0000E+00 -6.9098E-17 0.0000E+00
18 faces 29 faces 30 faces
K 0.0000 0.0000 0.0000
A4 -8.7973E-07 -1.2297E-05 -5.3524E-06
A6 -1.1780E-08 -4.4775E-09 -2.5556E-09
A8 -3.2855E-12 -2.9605E-11 -1.9302E-11
A10 2.1332E-14 5.0434E-14 3.8201E-14
A12 0.0000E+00 0.0000E+00 0.0000E+00
[Various data]
INF
Focal length 30.28
F number 1.47
Full angle of view 2ω 72.18
Image height Y 21.63
Lens length 152.52
[Variable interval data]
INF shooting distance 1335mm
d0 ∞ 1182.9464
d14 7.5525 6.7750
d30 38.4785 39.2560
BF 1.0000 1.0000
[Lens group data]
Group Starting surface Focal length
L1 1 177.70
L2 15 51.53
Lsf 1 81.41
［条件式対応値］
各実施例の諸収差図から明らかなとおり、本発明によれば、従来の結像光学系の課題であった軸上色収差を良好に補正し、Ｆ値がＦ１．４程度の結像光学系を提供することができる。 As is clear from the various aberration diagrams of the respective embodiments, according to the present invention, the longitudinal chromatic aberration, which has been a problem of conventional imaging optical systems, can be satisfactorily corrected, and the F value is about F1.4. can be provided.
Ｌ１ 第１レンズ群
Ｌ２ 第２レンズ群
Ｌｓｆ レンズ群Ｌｓｆ
Ｌ２ｃ ３枚接合レンズＬ２ｃ
Ｓ 開放絞り
ＬＰＦ ローパスフィルター
Ｉ 像面
L1 First lens group L2 Second lens group Lsf Lens group Lsf
L2c Triple cemented lens L2c
S open aperture LPF low pass filter I image plane
Claims (5)
正の屈折力を有する第１レンズ群Ｌ１と、
正の屈折力を有する第２レンズ群Ｌ２と、
からなり、
前記第１レンズ群Ｌ１は、２つ以上の接合レンズを有し、前記接合レンズは全て、物体側から像側へ順に、負レンズ素子と正レンズ素子とで構成され、
前記第２レンズ群Ｌ２は、開口絞りＳを含み、
フォーカシングに際して、前記第２レンズ群Ｌ２が物体側に移動するとともに、前記第１レンズ群Ｌ１が像面に対して固定であり、以下の条件式（１）を満足し、
前記第２レンズ群Ｌ２は、前記開口絞りＳより物体側に少なくとも１枚の正レンズ素子を有し、少なくとも１枚の前記正レンズ素子が以下の条件式（４）（５）を満足することを特徴とする結像光学系。
０．００９０ ＜ ΔＰｇｆＬ２ｆｐ （５）
但し、
Ａｃｉは以下の式で表される。
Ａｃｉ ＝ φｃｐｉ／νｄｃｐｉ ＋ φｃｍｉ／νｄｃｍｉ
φｃｐｉは、前記第１レンズ群Ｌ１に含まれる物体側からｉ番目の接合レンズの正レンズ素子の屈折力、
νｄｃｐｉは、前記第１レンズ群Ｌ１に含まれる物体側からｉ番目の接合レンズの正レンズ素子のアッベ数、
φｃｍｉは、前記第１レンズ群Ｌ１に含まれる物体側からｉ番目の接合レンズの負レンズ素子の屈折力、
νｄｃｍｉは、前記第１レンズ群Ｌ１に含まれる物体側からｉ番目の接合レンズの負レンズ素子のアッベ数である。
νｄＬ２ｆｐは前記正レンズ素子のアッベ数νｄ、
ＰｇｆＬ２ｆｐは前記正レンズ素子のｇ線とＦ線に関する部分分散比Ｐｇｆである。
ΔＰｇｆＬ２ｆｐは前記正レンズ素子の異常分散性であり、以下の式で表される。
ΔＰｇｆＬ２ｆｐ ＝ ＰｇｆＬ２ｆｐ ＋ ０．００１８×νｄＬ２ｆｐ － ０．６４８３３ From the object side to the image side,
a first lens group L1 having positive refractive power;
a second lens group L2 having positive refractive power;
consists of
The first lens unit L1 has two or more cemented lenses, and all of the cemented lenses are composed of a negative lens element and a positive lens element in order from the object side to the image side,
The second lens group L2 includes an aperture stop S,
During focusing, the second lens group L2 moves toward the object side, the first lens group L1 is fixed with respect to the image plane, and the following conditional expression (1) is satisfied ,
The second lens unit L2 has at least one positive lens element on the object side of the aperture stop S, and the at least one positive lens element satisfies the following conditional expressions (4) and (5): An imaging optical system characterized by:
0.0090<ΔPgfL2fp (5)
however,
Aci is represented by the following formula.
Aci = φcpi/νdcpi + φcmi/νdcmi
φcpi is the refractive power of the positive lens element of the i-th cemented lens from the object side included in the first lens unit L1;
νdcpi is the Abbe number of the positive lens element of the i-th cemented lens from the object side included in the first lens unit L1;
φcmi is the refractive power of the negative lens element of the i-th cemented lens from the object side included in the first lens group L1;
νdcmi is the Abbe number of the negative lens element of the i-th cemented lens from the object side included in the first lens unit L1.
νdL2fp is the Abbe number νd of the positive lens element;
PgfL2fp is the partial dispersion ratio Pgf for the g-line and the F-line of the positive lens element.
ΔPgfL2fp is the anomalous dispersion of the positive lens element and is expressed by the following equation.
ΔPgfL2fp=PgfL2fp+0.0018×νdL2fp−0.64833
φｃｐ／νｄｃｐ ＋ φｃｍ／νｄｃｍ ＞ ０ （２）
φｃ′ｐ／νｄｃ′ｐ ＋ φｃ′ｍ／νｄｃ′ｍ ＜ ０ （３）
但し、
φｃｐは、前記第１レンズ群Ｌ１に含まれる前記接合レンズの正レンズ素子の屈折力、
νｄｃｐは、前記第１レンズ群Ｌ１に含まれる前記接合レンズの正レンズ素子のアッベ数、
φｃｍは、前記第１レンズ群Ｌ１に含まれる前記接合レンズの負レンズ素子の屈折力、
νｄｃｍは、前記第１レンズ群Ｌ１に含まれる前記接合レンズの負レンズ素子のアッベ数、
φｃ′ｐは、前記第１レンズ群Ｌ１に含まれる前記接合レンズで条件式（２）を満足する接合レンズ以外の接合レンズの正レンズ素子の屈折力、
νｄｃ′ｐは、前記第１レンズ群Ｌ１に含まれる前記接合レンズで条件式（２）を満足する接合レンズ以外の接合レンズの正レンズ素子のアッベ数、
φｃ′ｍは、前記第１レンズ群Ｌ１に含まれる前記接合レンズで条件式（２）を満足する接合レンズ以外の接合レンズの負レンズ素子の屈折力、
νｄｃ′ｍは、前記第１レンズ群Ｌ１に含まれる前記接合レンズで条件式（２）を満足する接合レンズ以外の接合レンズの負レンズ素子のアッベ数である。 2. An imaging optical system according to claim 1, wherein said cemented lens satisfies the following conditional expressions at the same time.
φcp/νdcp + φcm/νdcm > 0 (2)
φc′p/νdc′p + φc′m/νdc′m < 0 (3)
however,
φcp is the refractive power of the positive lens element of the cemented lens included in the first lens group L1;
νdcp is the Abbe number of the positive lens element of the cemented lens included in the first lens unit L1;
φ cm is the refractive power of the negative lens element of the cemented lens included in the first lens group L1;
νdcm is the Abbe number of the negative lens element of the cemented lens included in the first lens unit L1;
φc'p is the refractive power of the positive lens element of the cemented lens other than the cemented lens that satisfies conditional expression (2) among the cemented lenses included in the first lens unit L1;
νdc′p is the Abbe number of the positive lens element of the cemented lens included in the first lens unit L1 and other than the cemented lens that satisfies conditional expression (2);
φc′m is the refractive power of the negative lens element of the cemented lens other than the cemented lens that satisfies conditional expression (2) among the cemented lenses included in the first lens unit L1;
νdc′m is the Abbe number of the negative lens element of the cemented lens included in the first lens unit L1 and other than the cemented lens that satisfies the conditional expression (2).
｜ＡＬ２ｃ｜ ＜ ０．００２０ （６）
ＰｇｆＬ２ｃｍは、前記接合レンズＬ２ｃに含まれる負レンズ素子の部分分散比であり、
ＡＬ２ｃは以下の式で表される。
ＡＬ２ｃ ＝ φＬ２ｃｐ１／νｄＬ２ｃｐ１ ＋ φＬ２ｃｍ１／νｄＬ２ｃｍ１ ＋ φＬ２ｃｐ２／νｄＬ２ｃｐ２
但し、
φＬ２ｃｐ１は、前記接合レンズＬ２ｃのうち、最も物体側に配される正レンズ素子の屈折力、
νｄＬ２ｃｐ１は、前記接合レンズＬ２ｃのうち、最も物体側に配される正レンズ素子のアッベ数、
φＬ２ｃｍ１は、前記接合レンズＬ２ｃのうち、負レンズ素子の屈折力、
νｄＬ２ｃｍ１は、前記接合レンズＬ２ｃのうち、負レンズ素子のアッベ数、
φＬ２ｃｐ２は、前記接合レンズＬ２ｃのうち、最も像側に配される正レンズ素子の屈折力、
νｄＬ２ｃｐ２は、前記接合レンズＬ２ｃのうち、最も像側に配される正レンズ素子のアッベ数である。 The second lens unit L2 has at least one triple cemented lens L2c with negative refractive power. 3. The imaging optical system according to claim 1, wherein the imaging optical system is composed of and satisfies the following conditional expression.
|AL2c| < 0.0020 (6)
PgfL2cm is the partial dispersion ratio of the negative lens element included in the cemented lens L2c,
AL2c is represented by the following formula.
AL2c = φL2cp1/νdL2cp1 + φL2cm1/νdL2cm1 + φL2cp2/νdL2cp2
however,
φL2cp1 is the refractive power of the positive lens element disposed closest to the object side of the cemented lens L2c;
νdL2cp1 is the Abbe number of the positive lens element disposed closest to the object in the cemented lens L2c;
φL2cm1 is the refractive power of the negative lens element in the cemented lens L2c,
νdL2cm1 is the Abbe number of the negative lens element in the cemented lens L2c,
φL2cp2 is the refractive power of the positive lens element arranged closest to the image side in the cemented lens L2c;
νdL2cp2 is the Abbe number of the positive lens element arranged closest to the image side in the cemented lens L2c.
１．５０ ＜ φ／φｓｆ ＜ ３．８０ （８）
但し、
φは、レンズ全系の無限遠合焦時の屈折力、
φｓｆは、前記レンズ群Ｌｓｆの無限遠合焦時の屈折力である。 All lens elements arranged on the object side of the aperture stop S are defined as a lens group Lsf, and the lens group Lsf has a positive refractive power and satisfies the following conditional expression: 4. The imaging optical system according to any one of 3 .
1.50<φ/φsf<3.80 (8)
however,
φ is the refractive power of the entire lens system when focused at infinity,
φsf is the refractive power of the lens group Lsf when focusing on infinity.
１．５０ ＜ φ／φ２ ＜ ２．８０ （９）
但し、
φは、レンズ全系の無限遠合焦時の屈折力、
φ２は、前記第２レンズ群Ｌ２の屈折力である。 5. An imaging optical system according to claim 1 , wherein the following conditional expression is satisfied.
1.50<φ/φ2<2.80 (9)
however,
φ is the refractive power of the entire lens system when focused at infinity,
φ2 is the refractive power of the second lens group L2.
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| CN116626856B (en) * | 2023-05-23 | 2026-01-02 | 深圳市东正光学技术股份有限公司 | An industrial inspection line scan lens |
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| JP2005316052A (en) | 2004-04-28 | 2005-11-10 | Tochigi Nikon Corp | Imaging optics |
| JP2015152812A (en) | 2014-02-17 | 2015-08-24 | 株式会社ニコン | Optical system, optical device, and method for manufacturing the optical system |
| JP2015152811A (en) | 2014-02-17 | 2015-08-24 | 株式会社ニコン | Optical system, optical device, and method for manufacturing the optical system |
| WO2019073744A1 (en) | 2017-10-13 | 2019-04-18 | ソニー株式会社 | Imaging lens and imaging device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005316052A (en) | 2004-04-28 | 2005-11-10 | Tochigi Nikon Corp | Imaging optics |
| JP2015152812A (en) | 2014-02-17 | 2015-08-24 | 株式会社ニコン | Optical system, optical device, and method for manufacturing the optical system |
| JP2015152811A (en) | 2014-02-17 | 2015-08-24 | 株式会社ニコン | Optical system, optical device, and method for manufacturing the optical system |
| WO2019073744A1 (en) | 2017-10-13 | 2019-04-18 | ソニー株式会社 | Imaging lens and imaging device |
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| JP2019219472A (en) | 2019-12-26 |
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