JP5151635B2 - PHOTOGRAPHIC LENS, OPTICAL DEVICE EQUIPPED WITH THIS PHOTOGRAPHIC LENS, AND IMAGE-FORMING METHOD - Google Patents
PHOTOGRAPHIC LENS, OPTICAL DEVICE EQUIPPED WITH THIS PHOTOGRAPHIC LENS, AND IMAGE-FORMING METHOD Download PDFInfo
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- JP5151635B2 JP5151635B2 JP2008100935A JP2008100935A JP5151635B2 JP 5151635 B2 JP5151635 B2 JP 5151635B2 JP 2008100935 A JP2008100935 A JP 2008100935A JP 2008100935 A JP2008100935 A JP 2008100935A JP 5151635 B2 JP5151635 B2 JP 5151635B2
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Description
本発明は、撮影レンズ、この撮影レンズを備えた光学機器、及び、結像方法に関する。 The present invention relates to a photographic lens, an optical apparatus including the photographic lens, and an imaging method.
従来、写真用カメラやビデオカメラ等で、Fナンバーが比較的明るく、高い光学性能が容易に得られるレンズタイプとして、いわゆるガウス型レンズがあり、現在も多く用いられている(例えば、特許文献1参照)。
しかしながら、従来のレンズでは、色収差、特に2次スペクトルの補正において不十分であるという課題があった。 However, the conventional lens has a problem that the correction of chromatic aberration, particularly the secondary spectrum, is insufficient.
本発明はこのような課題に鑑みてなされたものであり、Fナンバーが1.2程度であり、画面全体の諸収差、特に色収差を良好に補正することができ、画面全体にわたり高い光学性能を有した撮影レンズを提供することを目的とする。 The present invention has been made in view of such a problem, and has an F number of about 1.2, can satisfactorily correct various aberrations, particularly chromatic aberration, and has high optical performance over the entire screen. An object of the present invention is to provide a photographing lens.
前記課題を解決するために、第1の本発明に係る撮影レンズは、物体側より順に、正の屈折力を有する前側レンズ群と、正の屈折力を有する後側レンズ群との実質的に2個のレンズ群からなり、前側レンズ群は、開口絞りより物体側に、正の屈折力を有する第1レンズ成分と、正の屈折力を有する第2レンズ成分とを有し、後側レンズ群は、物体側より順に、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し、無限遠から近距離物体に合焦するときに、前側レンズ群と後側レンズ群との間隔が変化し、第1レンズ成分のd線に対するアッベ数をν1とし、第2レンズ成分のd線に対するアッベ数をν2とし、無限遠から撮影倍率−0.01倍に合焦するときの前側レンズ群の移動量をγF1とし、無限遠から撮影倍率−0.01倍に合焦するときの後側レンズ群の移動量をγR1とし、無限遠から撮影倍率−0.07倍に合焦するときの前側レンズ群の移動量をγF2とし、無限遠から撮影倍率−0.07倍に合焦するときの後側レンズ群の移動量をγR2としたとき、次式
(ν1+ν2)/2 > 60
0.35 < γR1/γF1 < 0.80
0.35 < γR2/γF2 ≦ 0.4416
の条件を満足するように構成される。
In order to solve the above problems, the imaging lens according to a first aspect of the present invention, in order from the object side, a front lens group having positive refractive power, positive substantially the rear lens group having a refractive power The front lens group includes two lens groups . The front lens group includes a first lens component having a positive refractive power and a second lens component having a positive refractive power on the object side from the aperture stop. The group has a cemented lens in which a positive lens and a negative lens are bonded in order from the object side, and the distance between the front lens group and the rear lens group changes when focusing on an object at a short distance from infinity. , The Abbe number of the first lens component with respect to the d-line is ν1, the Abbe number of the second lens component with respect to the d-line is ν2, and the amount of movement of the front lens unit when focusing from infinity to a photographing magnification of −0.01 times Is set to γF1, and the magnification is set to -0.01x from infinity. The amount of movement of the rear lens unit at the time of the [gamma] R1, the movement amount of the front lens group when focusing on infinity photographing magnification -0.07 times the Ganmaefu2, if the infinity photographing magnification -0.07 times When the amount of movement of the rear lens group during focusing is γR2 , the following formula (ν1 + ν2) / 2> 60
0.35 <γR1 / γF1 <0.80
0.35 <γR2 / γF2 ≦ 0.4416
It is configured to satisfy the following conditions.
また、第2の本発明に係る撮影レンズは、物体側より順に、正の屈折力を有する前側レンズ群と、正の屈折力を有する後側レンズ群との実質的に2個のレンズ群からなり、前側レンズ群は、最も物体側より順に、正の屈折力を有する第1レンズ成分と、正の屈折力を有する第2レンズ成分とを有し、後側レンズ群は、物体側より順に、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し、無限遠から近距離物体に合焦するときに、前側レンズ群と後側レンズ群との間隔が変化し、第1レンズ成分のd線に対するアッベ数をν1とし、第2レンズ成分のd線に対するアッベ数をν2とし、無限遠から撮影倍率−0.01倍に合焦するときの前側レンズ群の移動量をγF1とし、無限遠から撮影倍率−0.01倍に合焦するときの後側レンズ群の移動量をγR1とし、無限遠から撮影倍率−0.07倍に合焦するときの前側レンズ群の移動量をγF2とし、無限遠から撮影倍率−0.07倍に合焦するときの後側レンズ群の移動量をγR2としたとき、次式
(ν1+ν2)/2 > 60
0.35 < γR1/γF1 < 0.80
0.35 < γR2/γF2 ≦ 0.4416
の条件を満足するように構成される。
The photographic lens according to the second aspect of the present invention includes, in order from the object side , substantially two lens groups, a front lens group having a positive refractive power and a rear lens group having a positive refractive power. The front lens group has a first lens component having a positive refractive power and a second lens component having a positive refractive power in order from the most object side, and the rear lens group is in order from the object side. The lens has a cemented lens in which a positive lens and a negative lens are bonded, and when focusing on an object at a short distance from infinity, the distance between the front lens group and the rear lens group changes, and d of the first lens component The Abbe number with respect to the line is ν1, the Abbe number with respect to the d-line of the second lens component is ν2, the amount of movement of the front lens unit when focusing from infinity to the photographing magnification of −0.01 times is γF1, and the image is taken from infinity Rear lens when focusing at a magnification of -0.01x The moving amount of the [gamma] R1, the movement amount of the front lens group when focusing on infinity photographing magnification -0.07 times the Ganmaefu2, side lens after the time of focusing from infinity photographing magnification -0.07 times When the movement amount of the group is γR2 , the following formula (ν1 + ν2) / 2> 60
0.35 <γR1 / γF1 <0.80
0.35 <γR2 / γF2 ≦ 0.4416
It is configured to satisfy the following conditions.
また、第3の本発明に係る撮影レンズは、物体側より順に、正の屈折力を有する前側レンズ群と、正の屈折力を有する後側レンズ群との実質的に2個のレンズ群からなり、前側レンズ群は、開口絞りより物体側に、正の屈折力を有する第1レンズ成分と、正の屈折力を有する第2レンズ成分とを有し、後側レンズ群は、物体側より順に、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し、無限遠から近距離物体に合焦するときに、前側レンズ群と後側レンズ群との間隔が変化し、第1レンズ成分のd線に対するアッベ数をν1とし、第2レンズ成分のd線に対するアッベ数をν2とし、無限遠から撮影倍率−0.01倍に合焦するときの前側レンズ群の移動量をγF1とし、無限遠から撮影倍率−0.01倍に合焦するときの後側レンズ群の移動量をγR1とし、接合レンズの最も像側に配置された負レンズのd線に対する屈折率をn9、アッベ数をν9とし、当該負レンズの物体側に貼り合わされた正レンズのd線に対する屈折率をn8、アッベ数をν8としたとき、次式The photographic lens according to the third aspect of the present invention includes, in order from the object side, substantially two lens groups of a front lens group having a positive refractive power and a rear lens group having a positive refractive power. The front lens group has a first lens component having positive refractive power and a second lens component having positive refractive power on the object side from the aperture stop, and the rear lens group is closer to the object side. In order to have a cemented lens in which a positive lens and a negative lens are bonded together in order to focus on an object at a short distance from infinity, the distance between the front lens group and the rear lens group changes, and the first lens component The Abbe number with respect to the d-line is ν1, the Abbe number with respect to the d-line of the second lens component is ν2, the amount of movement of the front lens group when focusing from infinity to the photographing magnification of −0.01 times is γF1, and from infinity Rear lens when focusing at a magnification of -0.01x The amount of movement of the group is γR1, the refractive index for the d-line of the negative lens arranged closest to the image side of the cemented lens is n9, the Abbe number is ν9, and the d-line of the positive lens bonded to the object side of the negative lens When the refractive index for n is n8 and the Abbe number is ν8,
(ν1+ν2)/2 > 60(Ν1 + ν2) / 2> 60
0.35 < γR1/γF1 < 0.800.35 <γR1 / γF1 <0.80
n8 > n9n8> n9
ν8 > ν9ν8> ν9
の条件を満足するように構成される。It is configured to satisfy the following conditions.
また、第4の本発明に係る撮影レンズは、物体側より順に、正の屈折力を有する前側レンズ群と、正の屈折力を有する後側レンズ群との実質的に2個のレンズ群からなり、前側レンズ群は、最も物体側より順に、正の屈折力を有する第1レンズ成分と、正の屈折力を有する第2レンズ成分とを有し、後側レンズ群は、物体側より順に、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し、無限遠から近距離物体に合焦するときに、前側レンズ群と後側レンズ群との間隔が変化し、第1レンズ成分のd線に対するアッベ数をν1とし、第2レンズ成分のd線に対するアッベ数をν2とし、無限遠から撮影倍率−0.01倍に合焦するときの前側レンズ群の移動量をγF1とし、無限遠から撮影倍率−0.01倍に合焦するときの後側レンズ群の移動量をγR1とし、接合レンズの最も像側に配置された負レンズのd線に対する屈折率をn9、アッベ数をν9とし、当該負レンズの物体側に貼り合わされた正レンズのd線に対する屈折率をn8、アッベ数をν8としたとき、次式Further, the photographic lens according to the fourth aspect of the present invention includes, in order from the object side, substantially two lens groups, a front lens group having a positive refractive power and a rear lens group having a positive refractive power. The front lens group has a first lens component having a positive refractive power and a second lens component having a positive refractive power in order from the most object side, and the rear lens group is in order from the object side. The lens has a cemented lens in which a positive lens and a negative lens are bonded, and when focusing on an object at a short distance from infinity, the distance between the front lens group and the rear lens group changes, and d of the first lens component The Abbe number with respect to the line is ν1, the Abbe number with respect to the d-line of the second lens component is ν2, the amount of movement of the front lens unit when focusing from infinity to the photographing magnification of −0.01 times is γF1, and the image is taken from infinity Rear lens when focusing at a magnification of -0.01x ΓR1, the refractive index for the d-line of the negative lens arranged closest to the image side of the cemented lens is n9, the Abbe number is ν9, and the d-line of the positive lens bonded to the object side of the negative lens When the refractive index is n8 and the Abbe number is ν8,
(ν1+ν2)/2 > 60(Ν1 + ν2) / 2> 60
0.35 < γR1/γF1 < 0.800.35 <γR1 / γF1 <0.80
n8 > n9n8> n9
ν8 > ν9ν8> ν9
の条件を満足するように構成される。It is configured to satisfy the following conditions.
また、第5の本発明に係る撮影レンズは、物体側より順に、正の屈折力を有する前側レンズ群と、正の屈折力を有する後側レンズ群との実質的に2個のレンズ群からなり、前側レンズ群は、開口絞りより物体側に、正の屈折力を有する第1レンズ成分と、正の屈折力を有する第2レンズ成分とを有し、後側レンズ群は、物体側より順に、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し、第2レンズ成分と接合レンズとの間に、物体側より順に、負の屈折力を有する前側負レンズ成分と、開口絞りと、負の屈折力を有する後側負レンズ成分と、正の屈折力を有する後側正レンズ成分とを有し、第2レンズ成分と前側負レンズ成分との間に、物体側に凸面を向けたメニスカス形状の第3レンズ成分を有し、無限遠から近距離物体に合焦するときに、前側レンズ群と後側レンズ群との間隔が変化し、第1レンズ成分のd線に対するアッベ数をν1とし、第2レンズ成分のd線に対するアッベ数をν2とし、無限遠から撮影倍率−0.01倍に合焦するときの前側レンズ群の移動量をγF1とし、無限遠から撮影倍率−0.01倍に合焦するときの後側レンズ群の移動量をγR1としたとき、次式Further, the photographing lens according to the fifth aspect of the present invention includes, in order from the object side, substantially two lens groups of a front lens group having a positive refractive power and a rear lens group having a positive refractive power. The front lens group has a first lens component having positive refractive power and a second lens component having positive refractive power on the object side from the aperture stop, and the rear lens group is closer to the object side. In order, there is a cemented lens in which a positive lens and a negative lens are bonded together, and a front negative lens component having negative refractive power in order from the object side between the second lens component and the cemented lens, an aperture stop, and A rear negative lens component having a negative refractive power and a rear positive lens component having a positive refractive power, and a convex surface facing the object side between the second lens component and the front negative lens component With a third meniscus lens component that focuses on objects from infinity to close range The distance between the front lens group and the rear lens group changes, the Abbe number of the first lens component with respect to the d-line is ν1, the Abbe number of the second lens component with respect to the d-line is ν2, and shooting is performed from infinity. When the amount of movement of the front lens unit when focusing at a magnification of −0.01 is γF1, and the amount of movement of the rear lens unit when focusing at a photographing magnification of −0.01 from infinity is γR1, Next formula
(ν1+ν2)/2 > 60(Ν1 + ν2) / 2> 60
0.35 < γR1/γF1 < 0.800.35 <γR1 / γF1 <0.80
の条件を満足するように構成される。It is configured to satisfy the following conditions.
また、第6の本発明に係る撮影レンズは、物体側より順に、正の屈折力を有する前側レンズ群と、正の屈折力を有する後側レンズ群との実質的に2個のレンズ群からなり、前側レンズ群は、最も物体側より順に、正の屈折力を有する第1レンズ成分と、正の屈折力を有する第2レンズ成分とを有し、後側レンズ群は、物体側より順に、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し、第2レンズ成分と接合レンズとの間に、物体側より順に、負の屈折力を有する前側負レンズ成分と、開口絞りと、負の屈折力を有する後側負レンズ成分と、正の屈折力を有する後側正レンズ成分とを有し、第2レンズ成分と前側負レンズ成分との間に、物体側に凸面を向けたメニスカス形状の第3レンズ成分を有し、無限遠から近距離物体に合焦するときに、前側レンズ群と後側レンズ群との間隔が変化し、第1レンズ成分のd線に対するアッベ数をν1とし、第2レンズ成分のd線に対するアッベ数をν2とし、無限遠から撮影倍率−0.01倍に合焦するときの前側レンズ群の移動量をγF1とし、無限遠から撮影倍率−0.01倍に合焦するときの後側レンズ群の移動量をγR1としたとき、次式The photographic lens according to the sixth aspect of the present invention includes, in order from the object side, substantially two lens groups, a front lens group having a positive refractive power and a rear lens group having a positive refractive power. The front lens group has a first lens component having a positive refractive power and a second lens component having a positive refractive power in order from the most object side, and the rear lens group is in order from the object side. A positive lens and a negative lens are bonded to each other, and a front negative lens component having negative refractive power in order from the object side between the second lens component and the cemented lens, an aperture stop, A rear negative lens component having a negative refractive power and a rear positive lens component having a positive refractive power, and a convex surface facing the object side between the second lens component and the front negative lens component It has a third lens component with a meniscus shape and focuses on objects at close distances from infinity Sometimes, the distance between the front lens group and the rear lens group changes, the Abbe number of the first lens component with respect to the d-line is ν1, the Abbe number of the second lens component with respect to the d-line is ν2, and the imaging magnification from infinity. When the amount of movement of the front lens unit when focusing at -0.01 times is γF1, and the amount of movement of the rear lens unit when focusing from infinity to a photographing magnification of -0.01 times is γR1, formula
(ν1+ν2)/2 > 60(Ν1 + ν2) / 2> 60
0.35 < γR1/γF1 < 0.800.35 <γR1 / γF1 <0.80
の条件を満足するように構成される。It is configured to satisfy the following conditions.
また、第1及び第2の本発明に係る撮影レンズは、接合レンズの最も像側に配置された負レンズのd線に対する屈折率をn9、アッベ数をν9とし、当該負レンズの物体側に貼り合わされた正レンズのd線に対する屈折率をn8、アッベ数をν8としたとき、次式
n8 > n9
ν8 > ν9
の条件を満足することが好ましい。
また、第3〜6の本発明に係る撮影レンズは、無限遠から撮影倍率−0.07倍に合焦する際に、前側レンズ群の移動量をγF2とし、後側レンズ群の移動量をγR2としたとき、次式
0.35 < γR2/γF2 < 0.50
の条件を満足することが好ましい。
In the photographic lenses according to the first and second aspects of the present invention, the refractive index with respect to the d-line of the negative lens arranged closest to the image side of the cemented lens is n9, and the Abbe number is ν9. When the refractive index of the bonded positive lens with respect to the d-line is n8 and the Abbe number is ν8, the following expression n8> n9
ν8> ν9
It is preferable to satisfy the following conditions.
In the third to sixth photographic lenses according to the present invention, when focusing from infinity to a photographing magnification of -0.07, the amount of movement of the front lens unit is γF2, and the amount of movement of the rear lens unit is γR2. Then, the following formula 0.35 <γR2 / γF2 <0.50
It is preferable to satisfy the following conditions.
また、第1〜第4の本発明に係る撮影レンズは、第2レンズ成分と接合レンズとの間に、物体側より順に、負の屈折力を有する前側負レンズ成分と、開口絞りと、負の屈折力を有する後側負レンズ成分と、正の屈折力を有する後側正レンズ成分とを有することが好ましい。 The photographing lenses according to the first to fourth aspects of the present invention include, in order from the object side, a front negative lens component having negative refractive power, an aperture stop, and a negative lens between the second lens component and the cemented lens. It is preferable to have a rear negative lens component having a refractive power and a rear positive lens component having a positive refractive power.
また、第1〜第4の本発明に係る撮影レンズは、第2レンズ成分と前側負レンズ成分との間に、物体側に凸面を向けたメニスカス形状の第3レンズ成分を有することが好ましい。 The photographing lenses according to the first to fourth aspects of the present invention preferably have a meniscus third lens component having a convex surface facing the object side between the second lens component and the front negative lens component.
また、このような撮影レンズにおいて、前側負レンズ成分は、物体側に凸面を向けたメニスカス形状の第4レンズ成分であり、後側負レンズ成分は、両凹形状の第5レンズ成分であることが好ましい。 In such a photographing lens, the front negative lens component is a meniscus fourth lens component having a convex surface facing the object side, and the rear negative lens component is a biconcave fifth lens component. Is preferred.
また、このような撮影レンズは、後側正レンズ成分としての第6レンズ成分と接合レンズとの間に、正の屈折力を有する第7レンズ成分を有することが好ましい。 In addition, such a photographing lens preferably has a seventh lens component having a positive refractive power between the sixth lens component as the rear positive lens component and the cemented lens.
また、このような撮影レンズは、後側負レンズ成分と後側正レンズ成分とは、貼り合わされた接合レンズであることが好ましい。 Further, in such a photographing lens, it is preferable that the rear negative lens component and the rear positive lens component are a cemented lens that is bonded together.
また、このような撮影レンズは、前側負レンズ成分の像側の面の曲率半径をr8とし、当該撮影レンズ全系の焦点距離をfとしたとき、次式
0.30 < r8/f < 0.50
の条件を満足することが好ましい。
Further, in such a photographing lens, when the curvature radius of the image side surface of the front negative lens component is r8 and the focal length of the entire photographing lens system is f, the following expression 0.30 <r8 / f <0 .50
It is preferable to satisfy the following conditions.
また、このような撮影レンズは、第1レンズ成分のd線に対する屈折率をn1とし、第2レンズ成分のd線に対する屈折率をn2としたとき、次式
(n1+n2)/2 > 1.49
の条件を満足することが好ましい。
Further, in such a photographing lens, when the refractive index of the first lens component with respect to the d-line is n1, and the refractive index of the second lens component with respect to the d-line is n2, the following expression (n1 + n2) / 2> 1.49.
It is preferable to satisfy the following conditions.
また、このような撮影レンズは、前側レンズ群及び後側レンズ群は、中間撮影距離から近距離物体に合焦する際に、異なる移動量比で光軸に沿って移動することが好ましい。 Further, in such a photographing lens, it is preferable that the front lens group and the rear lens group move along the optical axis at different movement amount ratios when focusing on an object at a short distance from the intermediate photographing distance.
また、このような撮影レンズにおいて、第1レンズ成分及び第2レンズ成分は、それぞれ、物体側に凸面を向けたメニスカス形状であることが好ましい。 In such a photographing lens, it is preferable that the first lens component and the second lens component each have a meniscus shape with a convex surface facing the object side.
また、このような撮影レンズは、後側レンズ群の焦点距離をfRとし、当該撮影レンズ全系の焦点距離をfとしたとき、次式
1.00 < fR/f < 2.00
の条件を満足することが好ましい。
Also, in such a photographing lens, when the focal length of the rear lens group is fR and the focal length of the entire photographing lens system is f, the following expression 1.00 <fR / f <2.00
It is preferable to satisfy the following conditions.
また、本発明に係る光学機器は、物体の像を所定の位置に結像させる上述の撮影レンズのいずれかを備えて構成される。
また、本発明に係る結像方法は、物体側より順に、正の屈折力を有する前側レンズ群と、正の屈折力を有する後側レンズ群との実質的に2個のレンズ群からなり、前側レンズ群は、開口絞りより物体側に、正の屈折力を有する第1レンズ成分と、正の屈折力を有する第2レンズ成分とを有し、後側レンズ群は、物体側より順に、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し、無限遠から近距離物体に合焦するときに、前側レンズ群と後側レンズ群との間隔が変化し、第1レンズ成分のd線に対するアッベ数をν1とし、第2レンズ成分のd線に対するアッベ数をν2とし、無限遠から撮影倍率−0.01倍に合焦するときの前側レンズ群の移動量をγF1とし、無限遠から撮影倍率−0.01倍に合焦するときの後側レンズ群の移動量をγR1とし、無限遠から撮影倍率−0.07倍に合焦するときの前側レンズ群の移動量をγF2とし、無限遠から撮影倍率−0.07倍に合焦するときの後側レンズ群の移動量をγR2としたとき、次式
(ν1+ν2)/2 > 60
0.35 < γR1/γF1 < 0.80
0.35 < γR2/γF2 ≦ 0.4416
の条件を満足する撮影レンズを用いて行われる。
An optical apparatus according to the present invention includes any one of the above-described photographing lenses that forms an image of an object at a predetermined position.
Further, the imaging method according to the present invention includes, in order from the object side , substantially two lens groups of a front lens group having a positive refractive power and a rear lens group having a positive refractive power, The front lens group has a first lens component having a positive refractive power and a second lens component having a positive refractive power on the object side from the aperture stop , and the rear lens group is in order from the object side. When having a cemented lens in which a positive lens and a negative lens are bonded and focusing on an object at a short distance from infinity, the distance between the front lens group and the rear lens group changes, and the d-line of the first lens component The Abbe number with respect to d is the ν1, the Abbe number with respect to the d-line of the second lens component is ν2, the amount of movement of the front lens group when focusing from infinity to a photographing magnification of −0.01 times is γF1, and the photographing magnification from infinity -Rear lens group shift when focusing at -0.01x The amount and [gamma] R1, the movement amount of the front lens group when focusing on infinity photographing magnification -0.07 times the Ganmaefu2, the rear lens group when focusing on infinity photographing magnification -0.07 times When the movement amount is γR2 , the following formula (ν1 + ν2) / 2> 60
0.35 <γR1 / γF1 <0.80
0.35 <γR2 / γF2 ≦ 0.4416
This is performed using a photographic lens that satisfies the above conditions.
本発明に係る撮影レンズ、この撮影レンズを備えた光学機器、及び、結像方法を以上のように構成すると、Fナンバーが1.2程度であり、画面全体の諸収差、特に色収差を良好に補正することができ、画面全体にわたり高い光学性能を有した撮影レンズを得ることができる。 When the photographing lens according to the present invention, the optical apparatus equipped with the photographing lens, and the imaging method are configured as described above, the F number is about 1.2, and various aberrations, particularly chromatic aberration, of the entire screen are improved. It is possible to correct the photographic lens with high optical performance over the entire screen.
以下、本発明の好ましい実施形態について図面を参照して説明する。図1に示すように、本撮影レンズSLは、光軸に沿って、物体側から順に、正の屈折力を有する前側レンズ群GFと、正の屈折力を有する後側レンズ群GRとを有し、前側レンズ群GFは、最も物体側より順に、正の屈折力を有する第1レンズ成分G1と、正の屈折力を有する第2レンズ成分G2とを有し、後側レンズ群GRは、物体側より順に、正レンズG8及び負レンズG9を貼り合わせた接合レンズG89を有して構成されている。このような構成とすることにより、本撮影レンズSLは、有効径が25〜30mm程度の大口径レンズとすることができる。また、最も像側のレンズに、正レンズG8及び負レンズG9を貼り合わせた接合レンズG89を配置することで、像側に配置されたレンズでも色消し効果があり、全体として色収差が補正できる。特に、合焦時の色収差の変動を少なくすることができる。また、このような接合レンズとすることにより、光線の全反射を防ぎ、当該レンズにおいて光線を良好に通すことができる。 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the photographing lens SL has a front lens group GF having a positive refractive power and a rear lens group GR having a positive refractive power in order from the object side along the optical axis. The front lens group GF includes, in order from the most object side, a first lens component G1 having a positive refractive power and a second lens component G2 having a positive refractive power, and the rear lens group GR is In order from the object side, a cemented lens G89 in which a positive lens G8 and a negative lens G9 are bonded is provided. By adopting such a configuration, the photographing lens SL can be a large-diameter lens having an effective diameter of about 25 to 30 mm. Further, by disposing the cemented lens G89 in which the positive lens G8 and the negative lens G9 are bonded to the most image side lens, the lens disposed on the image side also has an achromatic effect, and chromatic aberration can be corrected as a whole. In particular, fluctuations in chromatic aberration during focusing can be reduced. Further, by using such a cemented lens, it is possible to prevent total reflection of light rays and to allow light rays to pass through the lenses satisfactorily.
本撮影レンズSLの具体的な実施の形態としては、図1に示すように、上述の第1レンズ成分G1、第2レンズ成分G2、及び、接合レンズG89に加えて、第2レンズ成分G2の像側と接合レンズG89の物体側との間に、物体側から順に、物体側に凸面を向けたメニスカス形状の第3レンズ成分G3と、負の屈折力を有する前側負レンズ成分G4と、開口絞りSと、負の屈折力を有する後側負レンズ成分G5及び正の屈折力を有する後側正レンズ成分G6を貼り合わせた接合レンズG56と、正の屈折力を有する第7レンズ成分G7とが設けられており、全体として、7群9枚のレンズで構成されていることが望ましい。 As a specific embodiment of the photographing lens SL, as shown in FIG. 1, in addition to the first lens component G1, the second lens component G2, and the cemented lens G89, the second lens component G2 is used. Between the image side and the object side of the cemented lens G89, in order from the object side, a third meniscus lens component G3 having a convex surface facing the object side, a front negative lens component G4 having negative refractive power, and an aperture A cemented lens G56 in which a stop S, a rear negative lens component G5 having negative refractive power and a rear positive lens component G6 having positive refractive power are bonded together, and a seventh lens component G7 having positive refractive power As a whole, it is desirable that the lens is composed of 9 lenses in 7 groups.
本撮影レンズSLは、いわゆるガウスタイプのレンズを変形したものである。ガウスタイプでは、絞りの前後にてレンズが略対称の形状をしているため、その対称性により歪曲収差などの補正が簡単である。また、本撮影レンズSLは、開口絞りSより物体側の負メニスカスレンズ(図1では、前側負レンズ成分G4)の物体側にレンズ成分を3枚配置することにより(図1では、第1〜第3レンズ成分G1〜G3)、それぞれの曲率半径が大きくなり、球面収差の発生を小さくしている。 The photographing lens SL is a modification of a so-called Gauss type lens. In the Gaussian type, the lens has a substantially symmetrical shape before and after the stop, so that correction of distortion and the like is easy due to the symmetry. Further, the photographing lens SL has three lens components arranged on the object side of the negative meniscus lens on the object side from the aperture stop S (the front negative lens component G4 in FIG. 1) (in FIG. The third lens components G1 to G3), the respective radii of curvature are increased, and the occurrence of spherical aberration is reduced.
また、本撮影レンズSLにおいて、第1レンズ成分G1及び第2レンズ成分G2は、それぞれ、物体側に凸面を向けたメニスカス形状が好ましい。第4レンズ成分である前側負レンズ成分G4は、物体側に凸面を向けたメニスカス形状が好ましい。また、第5レンズ成分である後側負レンズ成分G5は、両凹形状が好ましい。更に、最も像側に配置された接合レンズG89の正レンズG8は、両凸形状が好ましい。 In the photographing lens SL, the first lens component G1 and the second lens component G2 each preferably have a meniscus shape with a convex surface facing the object side. The front negative lens component G4, which is the fourth lens component, preferably has a meniscus shape with a convex surface facing the object side. The rear negative lens component G5, which is the fifth lens component, preferably has a biconcave shape. Furthermore, the positive lens G8 of the cemented lens G89 disposed on the most image side preferably has a biconvex shape.
また、前述したように、第2レンズ成分G2と前側負レンズ成分G4との間に、正または負の屈折力を有する第3レンズ成分G3を配置する場合、この第3レンズ成分G3は、1〜2枚構成が好ましい。また、後側負レンズ成分G5と接合レンズG89との間に、第7レンズ成分G7を配置する場合、この第7レンズ成分G7は、1〜2枚構成が好ましく、正の屈折力を有するのが好ましい。 As described above, when the third lens component G3 having positive or negative refractive power is disposed between the second lens component G2 and the front negative lens component G4, the third lens component G3 is 1 A two-sheet configuration is preferred. When the seventh lens component G7 is disposed between the rear negative lens component G5 and the cemented lens G89, the seventh lens component G7 preferably has one or two lenses and has a positive refractive power. Is preferred.
それでは、このような撮影レンズSLを構成するための条件について説明する。まず、この撮影レンズSLは、無限遠から近距離物体に合焦する際に、前側レンズ群GFと後側レンズ群GRとの間隔が増大するように、前側レンズ群GF及び後側レンズ群GRが異なる移動量で光軸に沿って物体側に移動し、第1レンズ成分G1のd線に対するアッベ数をν1とし、第2レンズ成分G2のd線に対するアッベ数をν2とし、無限遠から撮影倍率−0.01倍に合焦するときの前側レンズ群GFの移動量をγF1とし、無限遠から撮影倍率−0.01倍に合焦するときの後側レンズ群GRの移動量をγR1としたとき、以下に示す条件式(1)及び条件式(2)を満足することが望ましい。なお、第1レンズ成分G1または第2レンズ成分G2が接合レンズで構成されている場合には、そのアッベ数は、当該接合レンズを構成するレンズのアッベ数の平均値となる。 Now, conditions for configuring such a photographing lens SL will be described. First, when the photographing lens SL is focused on an object at a short distance from infinity, the front lens group GF and the rear lens group GR are arranged so that the distance between the front lens group GF and the rear lens group GR is increased. Moving toward the object side along the optical axis with different movement amounts, the Abbe number of the first lens component G1 with respect to the d-line is ν1, the Abbe number of the second lens component G2 with respect to the d-line is ν2, and the imaging magnification from infinity − When the amount of movement of the front lens group GF when focusing on 0.01 times is γF1, and the amount of movement of the rear lens group GR when focusing from infinity to a photographing magnification of −0.01 times is γR1, It is desirable to satisfy the following conditional expressions (1) and (2). When the first lens component G1 or the second lens component G2 is composed of a cemented lens, the Abbe number is an average value of the Abbe numbers of the lenses constituting the cemented lens.
(ν1+ν2)/2 > 60 (1)
0.35 < γR1/γF1 < 0.80 (2)
(Ν1 + ν2) / 2> 60 (1)
0.35 <γR1 / γF1 <0.80 (2)
条件式(1)は、前側レンズ群GF中の正の屈折力を有する第1レンズ成分G1と、正の屈折力を有する第2レンズ成分G2の光学材料特性の組み合わせを規定するための条件式である。条件式(1)の下限値を下回ると、最も物体側のレンズ成分が色収差の発生に大きな影響を持っている変形ガウスタイプの本撮影レンズSLにおいて、倍率色収差の補正が不足してしまい良好な性能を維持することが困難となってしまうため好ましくない。なお、本発明の効果を確実にするために、条件式(1)の下限値を61にすることが好ましい。また、本発明の効果を更に確実にするために、条件式(1)の下限値を63にすることが好ましい。更には、本発明の効果を更に確実にするために、条件式(1)の下限値を65にすることが更に好ましい。 Conditional expression (1) is a conditional expression for defining a combination of optical material characteristics of the first lens component G1 having a positive refractive power and the second lens component G2 having a positive refractive power in the front lens group GF. It is. If the lower limit of conditional expression (1) is not reached, in the modified Gaussian type photographing lens SL in which the lens component closest to the object has a great influence on the occurrence of chromatic aberration, the correction of lateral chromatic aberration is insufficient, which is favorable. Since it becomes difficult to maintain performance, it is not preferable. In order to secure the effect of the present invention, it is preferable to set the lower limit of conditional expression (1) to 61. In order to further secure the effect of the present invention, it is preferable to set the lower limit of conditional expression (1) to 63. Furthermore, in order to further secure the effect of the present invention, it is more preferable to set the lower limit of conditional expression (1) to 65.
条件式(2)は、前側レンズ群GF及び後側レンズ群GRの中間撮影距離時の合焦における移動比率の適切な範囲を規定するための条件式である。条件式(2)の上限値を上回ると、コマ収差及び像面湾曲が補正過剰になってしまうため好ましくない。なお、本発明の効果を確実にするために、条件式(2)の上限値を0.77にすることが好ましい。また、本発明の効果を更に確実にするために、条件式(2)の上限値を0.74にすることが好ましい。更には、本発明の効果を更に確実にするために、条件式(2)の上限値を0.71にすることが更に好ましい。反対に、条件式(2)の下限値を下回ると、コマ収差及び像面湾曲の補正が困難となってしまうため好ましくない。なお、本発明の効果を確実にするために、条件式(2)の下限値を0.39にすることが好ましい。また、本発明の効果を更に確実にするために、条件式(2)の下限値を0.43にすることが好ましい。更には、本発明の効果を更に確実にするために、条件式(2)の下限値を0.47にすることが更に好ましい。 Conditional expression (2) is a conditional expression for defining an appropriate range of the moving ratio in focusing at the intermediate shooting distance between the front lens group GF and the rear lens group GR. Exceeding the upper limit value of conditional expression (2) is not preferable because coma aberration and field curvature are excessively corrected. In order to secure the effect of the present invention, it is preferable to set the upper limit of conditional expression (2) to 0.77. In order to further secure the effect of the present invention, it is preferable to set the upper limit of conditional expression (2) to 0.74. Furthermore, in order to further secure the effect of the present invention, it is more preferable to set the upper limit of conditional expression (2) to 0.71. On the other hand, if the lower limit value of conditional expression (2) is not reached, correction of coma aberration and field curvature becomes difficult, which is not preferable. In order to secure the effect of the present invention, it is preferable to set the lower limit of conditional expression (2) to 0.39. In order to further secure the effect of the present invention, it is preferable to set the lower limit of conditional expression (2) to 0.43. Furthermore, in order to further secure the effect of the present invention, it is more preferable to set the lower limit of conditional expression (2) to 0.47.
また、本撮影レンズSLにおいて、第1レンズ成分G1のd線に対する屈折率をn1とし、第2レンズ成分G2のd線に対する屈折率をn2としたとき、以下に示す条件式(3)を満足することが望ましい。なお、第1レンズ成分G1または第2レンズ成分G2が接合レンズで構成されている場合には、その屈折率は、当該接合レンズを構成するレンズの屈折率の平均値となる。 In the photographing lens SL, when the refractive index of the first lens component G1 with respect to the d-line is n1, and the refractive index of the second lens component G2 with respect to the d-line is n2, the following conditional expression (3) is satisfied. It is desirable to do. In addition, when the 1st lens component G1 or the 2nd lens component G2 is comprised with the cemented lens, the refractive index becomes an average value of the refractive index of the lens which comprises the said cemented lens.
(n1+n2)/2 > 1.49 (3) (N1 + n2) / 2> 1.49 (3)
条件式(3)は、物体側の2つのメニスカス形状のレンズ成分G1,G2の屈折率を規定するための条件式である。条件式(3)を満足することにより、コマ収差及び倍率色収差を良好に補正することができる。なお、本発明の効果を確実にするために、条件式(3)の下限値を1.52にすることが好ましい。また、本発明の効果を更に確実にするために、条件式(3)の下限値を1.55にすることが好ましい。更には、本発明の効果を更に確実にするために、条件式(3)の下限値を1.59にすることが更に好ましい。 Conditional expression (3) is a conditional expression for defining the refractive indices of the two meniscus lens components G1 and G2 on the object side. By satisfying conditional expression (3), coma and lateral chromatic aberration can be corrected satisfactorily. In order to secure the effect of the present invention, it is preferable to set the lower limit of conditional expression (3) to 1.52. In order to further secure the effect of the present invention, it is preferable to set the lower limit of conditional expression (3) to 1.55. Furthermore, in order to further secure the effect of the present invention, it is more preferable to set the lower limit of conditional expression (3) to 1.59.
また、本実施形態に係る撮影レンズSLは、前側レンズ群GF及び後側レンズ群GRは、中間撮影距離から近距離物体に合焦する際に、異なる移動量比で光軸に沿って移動することが望ましい。このような構成とすることにより、無限遠から近距離までの撮影距離全域において、球面収差と像面湾曲を良好に補正することができる。なお、開口絞りSは、合焦の際に、前側負レンズ成分G4または後側負レンズ成分G5とともに光軸に沿って移動する。 In the photographing lens SL according to the present embodiment, the front lens group GF and the rear lens group GR move along the optical axis at different movement amount ratios when focusing on a short-distance object from the intermediate photographing distance. It is desirable. With such a configuration, it is possible to satisfactorily correct spherical aberration and curvature of field in the entire photographing distance from infinity to a short distance. The aperture stop S moves along the optical axis together with the front negative lens component G4 or the rear negative lens component G5 during focusing.
また、本撮影レンズSLにおいて、無限遠から撮影倍率−0.07倍に合焦する際に、前側レンズ群GFの移動量をγF2とし、後側レンズ群GRの移動量をγR2としたとき、以下に示す条件式(4)を満足することが望ましい。 Further, in the present photographing lens SL, when focusing from infinity to a photographing magnification of -0.07, when the movement amount of the front lens group GF is γF2 and the movement amount of the rear lens group GR is γR2, It is desirable that the conditional expression (4) shown below is satisfied.
0.35 < γR2/γF2 < 0.50 (4) 0.35 <γR2 / γF2 <0.50 (4)
条件式(4)は、前側レンズ群GF及び後側レンズ群GRの近距離撮影時の合焦における移動比率の適切な範囲を規定するための条件式である。条件式(4)の上限値を上回ると、コマ収差及び像面湾曲が補正過剰になってしまうため好ましくない。なお、本発明の効果を確実にするために、条件式(4)の上限値を0.48にすることが好ましい。また、本発明の効果を更に確実にするために、条件式(4)の上限値を0.46にすることが更に好ましい。反対に、条件式(4)の下限値を下回ると、コマ収差及び像面湾曲の補正が困難となってしまうため好ましくない。なお、本発明の効果を確実にするために、条件式(4)の下限値を0.36にすることが好ましい。また、本発明の効果を更に確実にするために、条件式(4)の下限値を0.37にすることが更に好ましい。 Conditional expression (4) is a conditional expression for defining an appropriate range of the movement ratio in focusing at the time of short-distance shooting of the front lens group GF and the rear lens group GR. Exceeding the upper limit value of conditional expression (4) is not preferable because coma aberration and field curvature are excessively corrected. In order to secure the effect of the present invention, it is preferable to set the upper limit of conditional expression (4) to 0.48. In order to further secure the effect of the present invention, it is more preferable to set the upper limit of conditional expression (4) to 0.46. On the other hand, if the lower limit of conditional expression (4) is not reached, correction of coma and field curvature is difficult, which is not preferable. In order to secure the effect of the present invention, it is preferable to set the lower limit of conditional expression (4) to 0.36. In order to further secure the effect of the present invention, it is more preferable to set the lower limit of conditional expression (4) to 0.37.
また、本撮影レンズSLにおいて、接合レンズG89の最も像側に配置された負レンズG9のd線に対する屈折率をn9、アッベ数をν9とし、当該負レンズG9の物体側に貼り合わされた正レンズG8のd線に対する屈折率をn8、アッベ数をν8としたとき、以下に示す条件式(5)及び(6)を満足することが望ましい。 Further, in the photographing lens SL, the negative lens G9 disposed closest to the image side of the cemented lens G89 has a refractive index of d9 and an Abbe number of ν9, and is a positive lens bonded to the object side of the negative lens G9. It is desirable that the following conditional expressions (5) and (6) are satisfied, where n8 is the refractive index of the G8 d-line and ν8 is the Abbe number.
n8 > n9 (5)
ν8 > ν9 (6)
n8> n9 (5)
ν8> ν9 (6)
条件式(5)及び(6)は、最も像側に配置された接合レンズG89の正レンズG8及び負レンズG9の屈折力とアッベ数とを規定するための条件式である。条件式(5)を満足することにより、ペッツバール和の増大を防ぐことができる。また、条件式(6)を満足することにより、色収差の良好な補正が可能である。ここで、コマ収差、球面収差の発生を抑えるために、正レンズG8に高屈折率の材料を使用すると、アッベ数が小さくなり、負レンズG9は色収差補正のために高い屈折率になってしまう。このため、ペッツバール和が大きくなってしまうおそれがある。しかしながら、後側レンズ群GRの接合レンズG89を、条件式(5)及び条件式(6)を同時に満足するような構成とすることで、高屈折率の材料を用いても色収差補正とペッツバール和が大きくなるのを防ぐこととができる。なお、本実施形態の効果をより確実にするためには、条件式(6)において、正レンズG8のアッベ数ν8が、負レンズG9のアッベ数ν9よりも20以上大きいこと、すなわち、次式(a)を満たすことが好ましい。 Conditional expressions (5) and (6) are conditional expressions for defining the refractive power and the Abbe number of the positive lens G8 and the negative lens G9 of the cemented lens G89 arranged on the most image side. By satisfying conditional expression (5), an increase in Petzval sum can be prevented. Moreover, satisfactory chromatic aberration can be corrected by satisfying conditional expression (6). Here, if a material having a high refractive index is used for the positive lens G8 in order to suppress the occurrence of coma and spherical aberration, the Abbe number becomes small, and the negative lens G9 has a high refractive index for chromatic aberration correction. . For this reason, the Petzval sum may be increased. However, the cemented lens G89 of the rear lens group GR is configured to satisfy the conditional expressions (5) and (6) at the same time, so that chromatic aberration correction and Petzval sum can be achieved even when a high refractive index material is used. Can be prevented from becoming large. In order to further secure the effect of the present embodiment, in the conditional expression (6), the Abbe number ν8 of the positive lens G8 is 20 or more larger than the Abbe number ν9 of the negative lens G9. It is preferable to satisfy (a).
ν8−ν9 > 20 (a) ν8-ν9> 20 (a)
本撮影レンズSLは、更に、前側負レンズ成分G4の像側の面(図1では、物体側から数えて第8番目のレンズ面)の曲率半径をr8とし、撮影レンズSL全系の焦点距離をfとしたとき、以下に示す条件式(7)を満足することが望ましい。 In the present photographing lens SL, the curvature radius of the image side surface of the front negative lens component G4 (in FIG. 1, the eighth lens surface counted from the object side) is set to r8, and the focal length of the entire photographing lens SL system. It is desirable that the following conditional expression (7) is satisfied, where is f.
0.30 < r8/f < 0.50 (7) 0.30 <r8 / f <0.50 (7)
条件式(7)は、焦点距離fに対する前側負レンズ成分G4の像側の面の曲率半径の比を規定するための条件式である。条件式(7)の上限値を上回ると、ペッツバール和が大きくなり、像面湾曲を補正することが困難となるため好ましくない。なお、本発明の効果を確実にするために、条件式(7)の上限値を0.45にすることが好ましい。また、本発明の効果を更に確実にするために、条件式(7)の上限値を0.40にすることが好ましい。更には、本発明の効果を更に確実にするために、条件式(7)上限値を0.35にすることが更に好ましい。反対に、条件式(7)の下限値を下回ると、コマ収差の補正が困難となってしまう。また、後側レンズ群GRのパワーが強くなり、全体として球面収差が良好に補正できなくなってしまうため好ましくない。なお、本発明の効果を確実にするために、条件式(7)の下限値を0.31にすることが好ましい。また、本発明の効果を更に確実にするために、条件式(7)の下限値を0.32にすることが更に好ましい。 Conditional expression (7) is a conditional expression for defining the ratio of the radius of curvature of the image-side surface of the front negative lens component G4 to the focal length f. Exceeding the upper limit of conditional expression (7) is not preferable because the Petzval sum becomes large and it becomes difficult to correct curvature of field. In order to secure the effect of the present invention, it is preferable to set the upper limit of conditional expression (7) to 0.45. In order to further secure the effect of the present invention, it is preferable to set the upper limit of conditional expression (7) to 0.40. Furthermore, in order to further secure the effect of the present invention, it is more preferable to set the upper limit of conditional expression (7) to 0.35. On the other hand, if the lower limit of conditional expression (7) is not reached, it will be difficult to correct coma. Further, the power of the rear lens group GR becomes strong, and the spherical aberration cannot be corrected satisfactorily as a whole, which is not preferable. In order to secure the effect of the present invention, it is preferable to set the lower limit of conditional expression (7) to 0.31. In order to further secure the effect of the present invention, it is more preferable to set the lower limit of conditional expression (7) to 0.32.
本撮影レンズSLは、後側レンズ群GRの焦点距離をfRとし、撮影レンズSL全系の焦点距離をfとしたとき、以下に示す条件式(8)を満足することが望ましい。 The photographing lens SL preferably satisfies the following conditional expression (8), where fR is the focal length of the rear lens group GR and f is the focal length of the entire photographing lens SL system.
1.00 < fR/f < 2.00 (8) 1.00 <fR / f <2.00 (8)
条件式(8)は、後側レンズ群GRの焦点距離と、撮影レンズSL全系の焦点距離との比を規定するための条件式である。条件式(8)の上限値を上回ると、撮影レンズSL全体が大型化してしまう。また、有限距離にて合焦した際、像面の変動が大きくなり、無限遠から近距離までの収差補正が困難となってしまうため好ましくない。また、合焦のための移動量が大きくなってしまい、鏡筒構造が大型化してしまい好ましくない。なお、本発明の効果を確実にするために、条件式(8)の上限値を1.90にすることが好ましい。また、本発明の効果を更に確実にするために、条件式(8)の上限値を1.80にすることが好ましい。また、本発明の効果を更に確実にするために、条件式(8)の上限値を1.60にすることが更に好ましい。反対に、条件式(8)の下限値を下回ると、球面収差の補正が困難となるため好ましくない。なお、本発明の効果を確実にするために、条件式(8)の下限値を1.10にすることが好ましい。また、本発明の効果を更に確実にするために、条件式(8)の下限値を1.20にすることが更に好ましい。 Conditional expression (8) is a conditional expression for defining a ratio between the focal length of the rear lens group GR and the focal length of the entire photographing lens SL. If the upper limit of conditional expression (8) is exceeded, the entire photographic lens SL will be enlarged. Further, when focusing at a finite distance, the fluctuation of the image plane becomes large, and it becomes difficult to correct aberrations from infinity to a short distance. Moreover, the amount of movement for focusing becomes large, and the lens barrel structure becomes large, which is not preferable. In order to secure the effect of the present invention, it is preferable to set the upper limit of conditional expression (8) to 1.90. In order to further secure the effect of the present invention, it is preferable to set the upper limit of conditional expression (8) to 1.80. In order to further secure the effect of the present invention, it is more preferable to set the upper limit of conditional expression (8) to 1.60. On the other hand, if the lower limit value of conditional expression (8) is not reached, correction of spherical aberration becomes difficult, which is not preferable. In order to secure the effect of the present invention, it is preferable to set the lower limit of conditional expression (8) to 1.10. In order to further secure the effect of the present invention, it is more preferable to set the lower limit of conditional expression (8) to 1.20.
また、この撮影レンズSLは、手ブレ等に起因する像ブレによる撮影の失敗を防ぐために、レンズ系のブレを検出するブレ検出系と駆動手段とをレンズ系に組み合わせ、レンズ系を構成するレンズ群のうち1つのレンズ群の全体または一部をシフトレンズ群として偏心させることにより、ブレ検出系により検出されたレンズ系のブレに起因する像ブレ(像面位置の変動)を補正するように、駆動手段によりシフトレンズ群を駆動させ、像をシフトさせることで、像ブレを補正することが可能である。上述のように、本実施形態の撮影レンズSLは、いわゆる防振光学系として機能させることが可能である。 In addition, the photographing lens SL is a lens that constitutes a lens system by combining a blur detection system that detects blurring of the lens system and a driving unit in the lens system in order to prevent photographing failure due to image blur caused by camera shake or the like. By decentering the whole or part of one lens group as a shift lens group, image blurring (fluctuation in image plane position) caused by blurring of the lens system detected by the blur detection system is corrected. The image blur can be corrected by driving the shift lens group by the driving means and shifting the image. As described above, the photographic lens SL of the present embodiment can function as a so-called vibration-proof optical system.
また、本実施形態では、レンズ系が2つの可動群から構成されているが、各レンズ群の間に他のレンズ群を付加したり、あるいはレンズ系の像側または物体側に隣接させて他のレンズ群を付加することも可能である。 In this embodiment, the lens system is composed of two movable groups. However, another lens group is added between the lens groups, or the lens system is adjacent to the image side or the object side of the lens system. It is also possible to add these lens groups.
本実施形態に係る撮影レンズSLは、35mmフィルムサイズ換算での焦点距離が、60〜150mm程度、好ましくは80〜90mm程度である。また、本実施形態に係る撮影レンズSLは、最も像側に配置される正レンズG9の像側面から像面までの距離(バックフォーカス)が最も小さい状態で、10〜30mm程度とするのがより望ましい。 The photographic lens SL according to this embodiment has a focal length in terms of 35 mm film size of about 60 to 150 mm, preferably about 80 to 90 mm. In addition, the photographic lens SL according to the present embodiment is more preferably about 10 to 30 mm in a state where the distance (back focus) from the image side surface of the positive lens G9 arranged closest to the image side to the image surface is the smallest. desirable.
なお、以下に記載の内容は、光学性能を損なわない範囲で適宜採用可能である。 The contents described below can be appropriately adopted as long as the optical performance is not impaired.
まず、レンズ面は、非球面としても構わない。このとき、研削加工による非球面、ガラスを型で非球面形状に形成したガラスモールド非球面、ガラスの表面に樹脂を非球面形状に形成した複合型非球面のいずれの非球面でも構わない。前側負レンズ成分G4(図1では、負メニスカスレンズL4)の像側の面、後側負レンズ成分G5(図1では、両凹レンズL5)の物体側の面、後側正レンズ成分G6(図1では、両凸レンズL6)の像側の面、の少なくとも1つと、正レンズG8(図1では、両凸レンズL8)の物体側の面との、いずれかが非球面であることが好ましい。また、レンズ面は回折面としても良く、レンズを屈折率分布型レンズ(GRINレンズ)あるいはプラスチックレンズとしても良い。 First, the lens surface may be an aspherical surface. At this time, any one of an aspheric surface by grinding, a glass mold aspheric surface in which glass is formed into an aspheric shape by a mold, and a composite aspheric surface in which resin is formed in an aspheric shape on the surface of the glass may be used. The image side surface of the front negative lens component G4 (negative meniscus lens L4 in FIG. 1), the object side surface of the rear negative lens component G5 (biconcave lens L5 in FIG. 1), and the rear positive lens component G6 (FIG. 1, at least one of the image side surface of the biconvex lens L6) and one of the object side surface of the positive lens G8 (biconvex lens L8 in FIG. 1) is preferably an aspherical surface. The lens surface may be a diffractive surface, and the lens may be a gradient index lens (GRIN lens) or a plastic lens.
また、開口絞りSは、前側負レンズ成分G4(図1では、負メニスカスレンズL4)と後側負レンズ成分G5(図1では、両凹レンズL5)との間に配置されるのが好ましいが、開口絞りとしての部材を設けずに、レンズの枠でその役割を代用しても良い。 The aperture stop S is preferably disposed between the front negative lens component G4 (negative meniscus lens L4 in FIG. 1) and the rear negative lens component G5 (biconcave lens L5 in FIG. 1). The role may be substituted by a lens frame without providing a member as an aperture stop.
さらに、各レンズ面には、広い波長域で高い透過率を有する反射防止膜を施すことにより、フレアやゴーストを軽減し、コントラストの高い光学性能を達成できる。 Furthermore, an antireflection film having a high transmittance in a wide wavelength region is applied to each lens surface, thereby reducing flare and ghost and achieving high optical performance with high contrast.
図9及び図10に、上述の撮影レンズSLを備える光学機器として、電子スチルカメラ1(以後、単にカメラ1と記す)の構成を示す。このカメラ1は、不図示の電源ボタンを押すと撮影レンズSLの不図示のシャッタが開放され、撮影レンズSLで不図示の被写体からの光が集光され、像面Iに配置された撮像素子C(例えば、フィルム、CCD、CMOS等)に結像される。撮像素子Cに結像された被写体像は、カメラ1の背後に配置された液晶モニター2に表示される。撮影者は、液晶モニター2を見ながら被写体像の構図を決めた後、レリーズボタン3を押し下げ被写体像を撮像素子Cで撮影し、不図示のメモリーに記録保存する。
9 and 10 show a configuration of an electronic still camera 1 (hereinafter simply referred to as camera 1) as an optical apparatus including the above-described photographing lens SL. In this
このカメラ1には、被写体が暗い場合に補助光を発光する補助光発光部4、変倍光学系を広角端状態(W)から望遠端状態(T)にズーミングする際のワイド(W)−テレ(T)ボタン5、及び、カメラ1の種々の条件設定等に使用するファンクションボタン6等が配置されている。また、本撮影レンズSLは、カメラボディに着脱可能な交換レンズにも適用できる。
The
なお、本発明を分かり易く説明するために実施形態の構成要件を付して説明したが、本発明がこれに限定されるものではないことは言うまでもない。 In addition, in order to explain the present invention in an easy-to-understand manner, the configuration requirements of the embodiment have been described, but it goes without saying that the present invention is not limited to this.
以下、本発明の各実施例を、図面に基づいて説明する。なお、図1、図3、図5及び図7は、各実施例に係る撮影レンズSL(SL1〜SL4)の構成及び屈折力配分並びに無限遠合焦状態から近距離合焦状態への合焦状態の変化における各レンズ群の移動の様子を示す断面図である。これらの図に示すように、本実施例に係る撮影レンズSL1〜SL4は、いずれも上述のように、光軸に沿って、物体側から順に、正の屈折力を有する前側レンズ群GF(第1〜7レンズ成分G1〜G7)と、正の屈折力を有する後側レンズ群GR(接合レンズG89)とを有し、これらは、物体側から順に、正の屈折力を有する第1レンズ成分G1と、正の屈折力を有する第2レンズ成分G2と、物体側に凸面を向けたメニスカス形状の第3レンズ成分G3と、負の屈折力を有する前側負レンズ成分(第4レンズ成分)G4と、開口絞りSと、負の屈折力を有する後側負レンズ成分(第5レンズ成分)G5及び正の屈折力を有する後側正レンズ成分(第6レンズ成分)G6を貼り合わせた接合レンズG56と、正の屈折力を有する第7レンズ成分G7と、正レンズG8及び負レンズG9を貼り合わせた接合レンズG89と、フィルター群FLとから構成される。ここで、フィルター群FLは、ローパスフィルターや赤外カットフィルター等から構成されている。そして、無限遠合焦状態から近距離合焦状態への合焦状態の変化(すなわちフォーカシング)に際して、前側レンズ群GF及び後側レンズ群GRは像面に対して移動し、前側レンズ群GFと後側レンズ群GRとの間隔が変化する。像面Iは、図10に示すように、撮像素子C(例えば、フィルム、CCD、CMOS等)に結像される。 Embodiments of the present invention will be described below with reference to the drawings. 1, 3, 5, and 7 show the configuration and refractive power distribution of the photographic lenses SL (SL1 to SL4) according to each embodiment, and focusing from an infinitely focused state to a short-distance focused state. It is sectional drawing which shows the mode of the movement of each lens group in the change of a state. As shown in these drawings, the photographic lenses SL1 to SL4 according to the present embodiment are all arranged in order from the object side along the optical axis in the order from the object side in the order of the front lens group GF (first lens) as described above. 1 to 7 lens components G1 to G7) and a rear lens group GR (junction lens G89) having a positive refractive power, and these are first lens components having a positive refractive power in order from the object side. G1, a second lens component G2 having positive refractive power, a meniscus third lens component G3 having a convex surface facing the object side, and a front negative lens component (fourth lens component) G4 having negative refractive power A cemented lens in which an aperture stop S, a rear negative lens component having a negative refractive power (fifth lens component) G5 and a rear positive lens component having a positive refractive power (sixth lens component) G6 are bonded together G56 and 7th lens with positive refractive power And component G7, a cemented lens G89 bonding the positive lens G8 and a negative lens G9, composed of a filter group FL. Here, the filter group FL includes a low-pass filter, an infrared cut filter, and the like. When the focusing state changes from the infinite focusing state to the short-distance focusing state (that is, focusing), the front lens group GF and the rear lens group GR move with respect to the image plane, and the front lens group GF The distance from the rear lens group GR changes. As shown in FIG. 10, the image plane I is imaged on an image sensor C (for example, film, CCD, CMOS, etc.).
〔第1実施例〕
図1は、本発明の第1実施例に係る撮影レンズSL1の構成を示す図である。この図1の撮影レンズSL1において、第1レンズ成分G1は、物体側に凸面を向けた正メニスカスレンズL1から構成され、第2レンズ成分G2は、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、第3レンズ成分G3は、物体側に凸面を向けた正メニスカスレンズL3から構成され、前側負レンズ成分(第4レンズ成分)G4は、物体側に凸面を向けた負メニスカスレンズL4から構成され、接合レンズG56は、両凹レンズL5からなる後側負レンズ成分(第5レンズ成分)G5と両凸レンズL6からなる後側正レンズ成分(第6レンズ成分)G6とを貼り合わせて構成され、第7レンズ成分G7は、両凸レンズL7から構成され、接合レンズG89は、両凸レンズL8からなる第8レンズG8と両凹レンズL9からなる第9レンズG9とを貼り合わせて構成される。以上の撮影レンズSL1の構成は、以降の実施例においても同様である。
[First embodiment]
FIG. 1 is a diagram showing the configuration of the taking lens SL1 according to the first embodiment of the present invention. In the photographic lens SL1 of FIG. 1, the first lens component G1 is composed of a positive meniscus lens L1 having a convex surface facing the object side, and the second lens component G2 is composed of a positive meniscus lens L2 having a convex surface facing the object side. The third lens component G3 is composed of a positive meniscus lens L3 having a convex surface facing the object side, and the front negative lens component (fourth lens component) G4 is composed of a negative meniscus lens L4 having a convex surface facing the object side. The cemented lens G56 is configured by bonding a rear negative lens component (fifth lens component) G5 composed of a biconcave lens L5 and a rear positive lens component (sixth lens component) G6 composed of a biconvex lens L6. The seventh lens component G7 is composed of a biconvex lens L7, and the cemented lens G89 is composed of an eighth lens G8 composed of a biconvex lens L8 and a biconcave lens L9. Constructed by bonding the ninth lens G9. The configuration of the photographic lens SL1 is the same in the following embodiments.
また、無限遠から近距離物体への合焦は、前側レンズ群GF及び後側レンズ群GRを別々に物体側に繰り出すことにより行われる。なお、開口絞りSは、前側レンズ群GF内(上述のように、前側負レンズ成分G4と後側負レンズ成分G5との間)に配置され、無限遠から近距離物体への合焦に際して前側レンズ群GFと一体に移動する。これらは、以降の実施例においても同様である。 Further, focusing from infinity to a short distance object is performed by separately extending the front lens group GF and the rear lens group GR to the object side. The aperture stop S is disposed in the front lens group GF (between the front negative lens component G4 and the rear negative lens component G5 as described above), and the front lens is used for focusing from infinity to a close object. Move together with group GF. The same applies to the following embodiments.
以下の表1に、第1実施例の諸元の値を掲げる。この表1において、fは焦点距離、FNOはFナンバー、2ωは画角、Bfはバックフォーカスをそれぞれ表している。さらに、面番号は光線の進行する方向に沿った物体側からのレンズ面の順序を、面間隔は各光学面から次の光学面までの光軸上の間隔を、屈折率及びアッベ数はそれぞれd線(λ=587.6nm)に対する値を示している。また、レンズ全長は、無限遠合焦時のレンズ面の第1面から像面Iまでの光軸上の距離を表している。ここで、以下の全ての諸元値において掲載されている焦点距離、曲率半径、面間隔、その他長さの単位は一般に「mm」が使われるが、光学系は、比例拡大または比例縮小し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。なお、曲率半径0.0000は平面を示し、空気の屈折率1.00000は省略してある。また、これらの符号の説明及び諸元表の説明は以降の実施例においても同様である。 Table 1 below lists values of specifications of the first embodiment. In Table 1, f represents the focal length, FNO represents the F number, 2ω represents the angle of view, and Bf represents the back focus. Furthermore, the surface number is the order of the lens surfaces from the object side along the direction of travel of the light beam, the surface interval is the distance on the optical axis from each optical surface to the next optical surface, and the refractive index and Abbe number are each The value for the d-line (λ = 587.6 nm) is shown. The total lens length represents a distance on the optical axis from the first surface of the lens surface to the image plane I when focusing on infinity. Here, “mm” is generally used for the focal length, the radius of curvature, the surface interval, and other length units listed in all the following specifications, but the optical system is proportionally enlarged or reduced. However, the same optical performance can be obtained, and the present invention is not limited to this. The radius of curvature of 0.0000 indicates a plane, and the refractive index of air of 1.0000 is omitted. The description of these symbols and the description of the specification table are the same in the following embodiments.
(表1)
f = 32.00
F.NO = 1.24
2ω = 29.86
像高 = 8.50
全長 = 56.13
面番号 曲率半径 面間隔 屈折率 アッベ数
1 35.6570 5.50 1.59319 67.87
2 329.8920 0.30
3 22.5026 4.30 1.59319 67.87
4 63.9805 0.20
5 21.4046 5.10 1.81600 46.63
6 21.5939 1.30
7 57.8235 1.30 1.67270 32.11
8 10.5445 4.90
9 0.0000 4.00 (開口絞りS)
10 -11.2740 1.30 1.69895 30.13
11 56.3778 4.35 1.88300 40.77
12 -19.0149 0.15
13 585.3078 2.85 1.75500 52.29
14 -33.3610 (d14)
15 40.4389 4.30 1.88300 40.77
16 -29.4995 1.40 1.76182 26.56
17 880.5274 (d17)
18 0.0000 0.50 1.51680 64.12
19 0.0000 4.60
20 0.0000 1.87 1.51680 64.12
21 0.0000 0.30
22 0.0000 0.70 1.51680 64.12
23 0.0000 (Bf)
(Table 1)
f = 32.00
F.NO = 1.24
2ω = 29.86
Image height = 8.50
Total length = 56.13
Surface number Curvature radius Surface spacing Refractive index Abbe number
1 35.6570 5.50 1.59319 67.87
2 329.8920 0.30
3 22.5026 4.30 1.59319 67.87
4 63.9805 0.20
5 21.4046 5.10 1.81600 46.63
6 21.5939 1.30
7 57.8235 1.30 1.67270 32.11
8 10.5445 4.90
9 0.0000 4.00 (Aperture stop S)
10 -11.2740 1.30 1.69895 30.13
11 56.3778 4.35 1.88300 40.77
12 -19.0149 0.15
13 585.3078 2.85 1.75500 52.29
14 -33.3610 (d14)
15 40.4389 4.30 1.88300 40.77
16 -29.4995 1.40 1.76182 26.56
17 880.5274 (d17)
18 0.0000 0.50 1.51680 64.12
19 0.0000 4.60
20 0.0000 1.87 1.51680 64.12
21 0.0000 0.30
22 0.0000 0.70 1.51680 64.12
23 0.0000 (Bf)
この第1実施例において、前側レンズ群GFと後側レンズ群GRとの軸上空気間隔d14及び後側レンズ群GRとフィルター群FLとの軸上空気間隔d17は、合焦に際して変化する。次の表2に無限遠合焦状態、中間撮影距離合焦状態及び近距離合焦状態における各群間隔を示す。なお、中間撮影距離は撮影倍率−0.01倍の撮影距離、近距離は撮影倍率−0.07倍の撮影距離である。これらの値は、以降の実施例についても同様である。 In the first embodiment, the axial air distance d14 between the front lens group GF and the rear lens group GR and the axial air distance d17 between the rear lens group GR and the filter group FL change during focusing. Table 2 below shows the distances between the groups in the infinite focus state, the intermediate shooting distance focus state, and the short distance focus state. The intermediate shooting distance is a shooting distance of a shooting magnification of -0.01 times, and the short distance is a shooting distance of a shooting magnification of -0.07 times. These values are the same for the following embodiments.
(表2)
無限遠 中間撮影距離 近距離
d14 1.2000 1.4261 3.2405
d17 5.1894 5.4248 6.8031
Bf 0.5160 0.5160 0.5160
(Table 2)
Infinity Intermediate shooting distance Short distance
d14 1.2000 1.4261 3.2405
d17 5.1894 5.4248 6.8031
Bf 0.5160 0.5160 0.5160
次の表3に、この第1実施例における各条件式対応値を示す。なおこの表3において、ν1は第1レンズ成分G1のアッベ数を、ν2は第2レンズ成分G2のアッベ数を、γF1は無限遠から撮影倍率−0.01倍に合焦するときの前側レンズ群GFの移動量を、γR1は無限遠から撮影倍率−0.01倍に合焦するときの後側レンズ群GRの移動量を、n1は第1レンズ成分G1のd線に対する屈折率を、n2は第2レンズ成分G2のd線に対する屈折率を、γF2は無限遠から撮影倍率−0.07倍に合焦するときの前側レンズ群GFの移動量を、γR2は無限遠から撮影倍率−0.07倍に合焦するときの後側レンズ群GRの移動量を、n8は正レンズG8のd線に対する屈折率を、n9は負レンズG9のd線に対する屈折率を、ν8は正レンズG8のアッベ数を、ν9は負レンズG9のアッベ数を、r8は前側負レンズ成分G4の像側の面(第8面)の曲率半径を、fは撮影レンズSL全系の焦点距離を、fRは後側レンズ群GRの焦点距離をそれぞれ表している。以上の符号の説明は以降の実施例においても同様である。
Table 3 below shows values corresponding to the conditional expressions in the first embodiment. In Table 3, ν1 is the Abbe number of the first lens component G1, ν2 is the Abbe number of the second lens component G2, and γF1 is the front lens group when focusing from infinity to a photographing magnification of -0.01 times. The amount of movement of GF, γR1 is the amount of movement of the rear lens group GR when focusing from infinity to a photographing magnification of −0.01 times, n1 is the refractive index of the first lens component G1 with respect to the d-line, and n2 is The refractive index of the second lens component G2 with respect to the d-line, γF2 is the amount of movement of the front lens group GF when focusing from infinity to the photographing magnification −0.07 times, and γR2 is the photographing magnification −0.07 times from infinity. N8 is the refractive index of the positive lens G8 with respect to the d-line, n9 is the refractive index of the negative lens G9 with respect to the d-line, and ν8 is the Abbe number of the positive lens G8. Ν9 is the Abbe number of the negative lens G9,
(表3)
ν1=67.87
ν2=67.87
γF1=-0.4614
γR1=-0.2354
n1=1.59319
n2=1.59319
γF2=-3.6542
γR2=-1.6137
n8=1.88300
n9=1.76182
ν8=40.77
ν9=26.56
r8=10.5445
f=32.0013
fR=40.1057
(1)(ν1+ν2)/2=67.87
(2)γR1/γF1=0.5102
(3)(n1+n2)/2=1.59319
(4)γR2/γF2=0.4416
(5)n8 > n9:1.88300>1.76182
(6)ν8 > ν9:40.77>26.56
(7)r8/f=0.3295
(8)fR/f=1.2533
(Table 3)
ν1 = 67.87
ν2 = 67.87
γF1 = -0.4614
γR1 = -0.2354
n1 = 1.59319
n2 = 1.59319
γF2 = -3.6542
γR2 = -1.6137
n8 = 1.88300
n9 = 1.76182
ν8 = 40.77
ν9 = 26.56
r8 = 10.5445
f = 32.0013
fR = 40.1057
(1) (ν1 + ν2) /2=67.87
(2) γR1 / γF1 = 0.5102
(3) (n1 + n2) /2=1.59319
(4) γR2 / γF2 = 0.4416
(5) n8> n9: 1.88300> 1.76182
(6) ν8> ν9: 40.77> 26.56
(7) r8 / f = 0.3295
(8) fR / f = 1.533
第1実施例の諸収差図を図2に示す。図2(a)は無限遠合焦状態における諸収差図であり、図2(b)は撮影倍率−0.01倍に合焦したときの中間撮影距離合焦状態における諸収差図であり、図2(c)は撮影倍率−0.07倍に合焦したときの近距離合焦状態における諸収差図である。各収差図において、FNOはFナンバーを、NAは開口数を、Aは半画角を、H0は物体高を、dはd線(λ=587.6nm)を、gはg線(λ=435.6nm)を、CはC線(λ=656.3nm)を、FはF線(λ=486.1nm)を、それぞれ示している。また、非点収差を示す収差図において実線はサジタル像面を示し、破線はメリディオナル像面を示している。なお、この収差図の説明は以降の実施例においても同様である。各収差図から明らかなように、第1実施例では、各合焦状態において諸収差が良好に補正され、優れた結像性能を有することがわかる。 The aberration diagrams of the first example are shown in FIG. FIG. 2A is a diagram of various aberrations in the infinitely focused state, and FIG. 2B is a diagram of various aberrations in the intermediate photographing distance in-focus state when the photographing magnification is in focus of -0.01 times. FIG. 2C is a diagram showing various aberrations in a short distance in-focus state when focusing is performed at a photographing magnification of −0.07. In each aberration diagram, FNO is the F number, NA is the numerical aperture, A is the half field angle, H0 is the object height, d is the d-line (λ = 587.6 nm), and g is the g-line (λ = 435.6 nm), C represents the C line (λ = 656.3 nm), and F represents the F line (λ = 486.1 nm). In the aberration diagrams showing astigmatism, the solid line shows the sagittal image plane, and the broken line shows the meridional image plane. The description of this aberration diagram is the same in the following examples. As is apparent from the respective aberration diagrams, in the first example, it is understood that various aberrations are favorably corrected in each in-focus state, and excellent imaging performance is obtained.
〔第2実施例〕
図3は、本発明の第2実施例に係る撮影レンズSL2の構成を示す図である。この図3の撮影レンズSL2の構成は、第1実施例に係る撮影レンズSL1の構成と同様である。以下の表4に、この第2実施例の諸元の値を掲げる。
[Second Embodiment]
FIG. 3 is a diagram showing the configuration of the taking lens SL2 according to the second embodiment of the present invention. The configuration of the photographic lens SL2 in FIG. 3 is the same as the configuration of the photographic lens SL1 according to the first example. Table 4 below shows values of specifications of the second embodiment.
(表4)
f = 32.00
F.NO = 1.23
2ω = 29.87
像高 = 8.50
全長 = 56.42
面番号 曲率半径 面間隔 屈折率 アッベ数
1 35.2403 5.50 1.59319 67.87
2 320.9635 0.30
3 23.0116 4.30 1.59319 67.87
4 61.7430 0.10
5 21.5169 5.20 1.81600 46.62
6 22.0129 1.30
7 55.3189 1.30 1.67270 32.10
8 10.6045 4.90
9 0.0000 4.00 (開口絞りS)
10 -11.2748 1.30 1.69895 30.13
11 55.2195 4.50 1.88300 40.76
12 -18.8925 0.10
13 301.4844 2.85 1.75500 52.32
14 -34.5531 (d14)
15 41.3343 4.30 1.88300 40.76
16 -31.0688 1.40 1.76182 26.52
17 458.1219 (d17)
18 0.0000 1.00 1.51680 64.10
19 0.0000 1.50
20 0.0000 1.87 1.51680 64.10
21 0.0000 0.40
22 0.0000 0.70 1.51680 64.10
23 0.0000 (Bf)
(Table 4)
f = 32.00
F.NO = 1.23
2ω = 29.87
Image height = 8.50
Total length = 56.42
Surface number Curvature radius Surface spacing Refractive index Abbe number
1 35.2403 5.50 1.59319 67.87
2 320.9635 0.30
3 23.0116 4.30 1.59319 67.87
4 61.7430 0.10
5 21.5169 5.20 1.81600 46.62
6 22.0129 1.30
7 55.3189 1.30 1.67270 32.10
8 10.6045 4.90
9 0.0000 4.00 (Aperture stop S)
10 -11.2748 1.30 1.69895 30.13
11 55.2195 4.50 1.88300 40.76
12 -18.8925 0.10
13 301.4844 2.85 1.75500 52.32
14 -34.5531 (d14)
15 41.3343 4.30 1.88300 40.76
16 -31.0688 1.40 1.76182 26.52
17 458.1219 (d17)
18 0.0000 1.00 1.51680 64.10
19 0.0000 1.50
20 0.0000 1.87 1.51680 64.10
21 0.0000 0.40
22 0.0000 0.70 1.51680 64.10
23 0.0000 (Bf)
この第2実施例において、前側レンズ群GFと後側レンズ群GRとの軸上空気間隔d14及び後側レンズ群GRとフィルター群FLとの軸上空気間隔d17は、合焦に際して変化する。次の表5に無限遠合焦状態、中間撮影距離合焦状態及び近距離合焦状態における各群間隔を示す。 In the second embodiment, the axial air distance d14 between the front lens group GF and the rear lens group GR and the axial air distance d17 between the rear lens group GR and the filter group FL change during focusing. Table 5 below shows each group interval in the infinite focus state, the intermediate shooting distance focus state, and the short distance focus state.
(表5)
無限遠 中間撮影距離 近距離
d14 1.2000 1.4382 3.3177
d17 7.9043 8.1353 9.4426
Bf 0.5000 0.5000 0.5000
(Table 5)
Infinity Intermediate shooting distance Short distance
d14 1.2000 1.4382 3.3177
d17 7.9043 8.1353 9.4426
Bf 0.5000 0.5000 0.5000
次の表6に、この第2実施例における各条件式対応値を示す。 Table 6 below shows values corresponding to the conditional expressions in the second embodiment.
(表6)
ν1=67.87
ν2=67.87
γF1=-0.4692
γR1=-0.2310
n1=1.59319
n2=1.59319
γF2=-3.6560
γR2=-1.5383
n8=1.88300
n9=1.76182
ν8=40.76
ν9=26.52
r8=10.6045
f=32.0001
fR=42.5105
(1)(ν1+ν2)/2=67.87
(2)γR1/γF1=0.4923
(3)(n1+n2)/2=1.59319
(4)γR2/γF2=0.4208
(5)n8 >n9:1.88300>1.76182
(6)ν8 >ν9:40.76>26.52
(7)r8/f=0.3314
(8)fR/f=1.3284
(Table 6)
ν1 = 67.87
ν2 = 67.87
γF1 = -0.4692
γR1 = -0.2310
n1 = 1.59319
n2 = 1.59319
γF2 = -3.6560
γR2 = -1.5383
n8 = 1.88300
n9 = 1.76182
ν8 = 40.76
ν9 = 26.52
r8 = 10.6045
f = 32.0001
fR = 42.5105
(1) (ν1 + ν2) /2=67.87
(2) γR1 / γF1 = 0.4923
(3) (n1 + n2) /2=1.59319
(4) γR2 / γF2 = 0.4208
(5) n8> n9: 1.88300> 1.76182
(6) ν8> ν9: 40.76> 26.52
(7) r8 / f = 0.314
(8) fR / f = 1.3284
この第2実施例の諸収差図を図4に示す。図4(a)は無限遠合焦状態における諸収差図であり、図4(b)は撮影倍率−0.01倍に合焦したときの中間撮影距離合焦状態における諸収差図であり、図4(c)は撮影倍率−0.07倍に合焦したときの近距離合焦状態における諸収差図である。この収差図から明らかなように、第2実施例では、各合焦状態において、諸収差が良好に補正され、優れた結像性能を有することがわかる。 FIG. 4 shows various aberrations of the second example. FIG. 4A is a diagram of various aberrations in the infinitely focused state, and FIG. 4B is a diagram of various aberrations in the intermediate photographing distance in-focus state when the photographing magnification is in focus of -0.01 times. FIG. 4C is a diagram illustrating various aberrations in a short-distance in-focus state when focusing is performed at an imaging magnification of −0.07. As is apparent from this aberration diagram, it can be seen that in the second example, various aberrations are satisfactorily corrected and excellent imaging performance is obtained in each in-focus state.
〔第3実施例〕
図5は、本発明の第3実施例に係る撮影レンズSL3の構成を示す図である。この図5の撮影レンズSL3の構成は、第1実施例に係る撮影レンズSL1の構成と同様である。以下の表7に、この第3実施例の諸元の値を掲げる。
[Third embodiment]
FIG. 5 is a diagram showing a configuration of the taking lens SL3 according to the third embodiment of the present invention. The configuration of the photographic lens SL3 in FIG. 5 is the same as the configuration of the photographic lens SL1 according to the first example. Table 7 below shows values of specifications of the third embodiment.
(表7)
f = 32.00
F.NO = 1.23
2ω = 29.87
像高 = 8.50
全長 = 54.44
面番号 曲率半径 面間隔 屈折率 アッベ数
1 28.9228 4.35 1.59240 68.36
2 268.2548 0.10
3 24.4064 3.53 1.59240 68.36
4 60.0552 0.10
5 19.8422 3.97 1.81600 46.62
6 20.9876 1.77
7 68.6280 1.30 1.67270 32.10
8 10.9636 4.16
9 0.0000 4.76 (開口絞りS)
10 -11.7583 1.30 1.67270 32.10
11 70.5542 4.53 1.88300 40.76
12 -19.8231 0.10
13 861.2368 2.91 1.75500 52.32
14 -33.5214 (d14)
15 40.3110 4.53 1.88300 40.76
16 -29.5297 1.67 1.76182 26.52
17 129.4578 (d17)
18 0.0000 1.00 1.51680 64.10
19 0.0000 1.50
20 0.0000 1.87 1.51680 64.10
21 0.0000 0.40
22 0.0000 0.70 1.51680 64.10
23 0.0000 (Bf)
(Table 7)
f = 32.00
F.NO = 1.23
2ω = 29.87
Image height = 8.50
Total length = 54.44
Surface number Curvature radius Surface spacing Refractive index Abbe number
1 28.9228 4.35 1.59240 68.36
2 268.2548 0.10
3 24.4064 3.53 1.59240 68.36
4 60.0552 0.10
5 19.8422 3.97 1.81600 46.62
6 20.9876 1.77
7 68.6280 1.30 1.67270 32.10
8 10.9636 4.16
9 0.0000 4.76 (Aperture stop S)
10 -11.7583 1.30 1.67270 32.10
11 70.5542 4.53 1.88300 40.76
12 -19.8231 0.10
13 861.2368 2.91 1.75500 52.32
14 -33.5214 (d14)
15 40.3110 4.53 1.88300 40.76
16 -29.5297 1.67 1.76182 26.52
17 129.4578 (d17)
18 0.0000 1.00 1.51680 64.10
19 0.0000 1.50
20 0.0000 1.87 1.51680 64.10
21 0.0000 0.40
22 0.0000 0.70 1.51680 64.10
23 0.0000 (Bf)
この第3実施例において、前側レンズ群GFと後側レンズ群GRとの軸上空気間隔d14及び後側レンズ群GRとフィルター群FLとの軸上空気間隔d17は、合焦に際して変化する。次の表8に無限遠合焦状態、中間撮影距離合焦状態及び近距離合焦状態における各群間隔を示す。 In the third embodiment, the axial air distance d14 between the front lens group GF and the rear lens group GR and the axial air distance d17 between the rear lens group GR and the filter group FL change during focusing. Table 8 below shows each group interval in the infinitely focused state, the intermediate shooting distance focused state, and the short distance focused state.
(表8)
無限遠 中間撮影距離 近距離
d14 1.2000 1.3739 3.4519
d17 8.1721 8.4228 9.5938
Bf 0.5000 0.5000 0.5000
(Table 8)
Infinity Intermediate shooting distance Short distance
d14 1.2000 1.3739 3.4519
d17 8.1721 8.4228 9.5938
Bf 0.5000 0.5000 0.5000
次の表9に、この第3実施例における各条件式対応値を示す。 Table 9 below shows values corresponding to the conditional expressions in the third embodiment.
(表9)
ν1=68.36
ν2=68.36
γF1=-0.4247
γR1=-0.2507
n1=1.59240
n2=1.59240
γF2=-3.6735
γR2=-1.4217
n8=1.88300
n9=1.76182
ν8=40.76
ν9=26.52
r8=10.9636
f=32.0003
fR=49.1132
(1)(ν1+ν2)/2=68.36
(2)γR1/γF1=0.5903
(3)(n1+n2)/2=1.59240
(4)γR2/γF2=0.3870
(5)n8 > n9:1.88300>1.76182
(6)ν8 > ν9:40.76>26.52
(7)r8/f=0.3426
(8)fR/f=1.5348
(Table 9)
ν1 = 68.36
ν2 = 68.36
γF1 = -0.4247
γR1 = -0.2507
n1 = 1.59240
n2 = 1.59240
γF2 = -3.6735
γR2 = -1.4217
n8 = 1.88300
n9 = 1.76182
ν8 = 40.76
ν9 = 26.52
r8 = 10.9636
f = 32.0003
fR = 49.1132
(1) (ν1 + ν2) /2=68.36
(2) γR1 / γF1 = 0.5903
(3) (n1 + n2) /2=1.59240
(4) γR2 / γF2 = 0.3870
(5) n8> n9: 1.88300> 1.76182
(6) ν8> ν9: 40.76> 26.52
(7) r8 / f = 0.3426
(8) fR / f = 1.5348
この第3実施例の諸収差図を図6に示す。図6(a)は無限遠合焦状態における諸収差図であり、図6(b)は撮影倍率−0.01倍に合焦したときの中間撮影距離合焦状態における諸収差図であり、図6(c)は撮影倍率−0.07倍に合焦したときの近距離合焦状態における諸収差図である。この収差図から明らかなように、第3実施例では、各合焦状態において、諸収差が良好に補正され、優れた結像性能を有することがわかる。 The aberration diagrams of the third example are shown in FIG. FIG. 6A is a diagram of various aberrations in the infinitely focused state, and FIG. 6B is a diagram of various aberrations in the intermediate photographing distance in-focus state when the photographing magnification is -0.01 times. FIG. 6C is a diagram illustrating various aberrations in a short-distance in-focus state when focusing is performed at an imaging magnification of −0.07. As is apparent from this aberration diagram, it can be seen that in the third example, various aberrations are satisfactorily corrected and excellent imaging performance is obtained in each in-focus state.
〔第4実施例〕
図7は、本発明の第4実施例に係る撮影レンズSL4の構成を示す図である。この図7の撮影レンズSL4の構成は、第7レンズ成分G7を、像側に凸面を向けた正メニスカスレンズL7から構成した点以外は、第1実施例に係る撮影レンズSL1の構成と同様である。以下の表10に、この第4実施例の諸元の値を掲げる。
[Fourth embodiment]
FIG. 7 is a diagram showing the configuration of the taking lens SL4 according to the fourth embodiment of the present invention. The configuration of the photographic lens SL4 in FIG. 7 is the same as the configuration of the photographic lens SL1 according to the first example except that the seventh lens component G7 is composed of a positive meniscus lens L7 having a convex surface facing the image side. is there. Table 10 below lists values of specifications of the fourth embodiment.
(表10)
f = 32.00
F.NO = 1.23
2ω = 29.87
像高 = 8.50
全長 = 56.04
面番号 曲率半径 面間隔 屈折率 アッベ数
1 28.9228 4.24 1.59319 67.87
2 198.4893 0.10
3 25.2661 3.45 1.59319 67.87
4 61.0768 0.10
5 21.7621 5.60 1.81600 46.62
6 22.6394 1.41
7 59.8650 1.30 1.67270 32.10
8 10.4447 4.02
9 0.0000 5.42 (開口絞りS)
10 -10.7127 1.30 1.67270 32.10
11 100.4090 3.97 1.81600 46.62
12 -19.6771 0.10
13 -237.5005 3.65 1.75500 52.32
14 -23.2086 (d14)
15 35.4041 4.81 1.88300 40.76
16 -38.2481 1.50 1.80518 25.42
17 568.3560 (d17)
18 0.0000 1.00 1.51680 64.10
19 0.0000 1.50
20 0.0000 1.87 1.51680 64.10
21 0.0000 0.40
22 0.0000 0.70 1.51680 64.10
23 0.0000 (Bf)
(Table 10)
f = 32.00
F.NO = 1.23
2ω = 29.87
Image height = 8.50
Total length = 56.04
Surface number Curvature radius Surface spacing Refractive index Abbe number
1 28.9228 4.24 1.59319 67.87
2 198.4893 0.10
3 25.2661 3.45 1.59319 67.87
4 61.0768 0.10
5 21.7621 5.60 1.81600 46.62
6 22.6394 1.41
7 59.8650 1.30 1.67270 32.10
8 10.4447 4.02
9 0.0000 5.42 (Aperture stop S)
10 -10.7127 1.30 1.67270 32.10
11 100.4090 3.97 1.81600 46.62
12 -19.6771 0.10
13 -237.5005 3.65 1.75500 52.32
14 -23.2086 (d14)
15 35.4041 4.81 1.88300 40.76
16 -38.2481 1.50 1.80518 25.42
17 568.3560 (d17)
18 0.0000 1.00 1.51680 64.10
19 0.0000 1.50
20 0.0000 1.87 1.51680 64.10
21 0.0000 0.40
22 0.0000 0.70 1.51680 64.10
23 0.0000 (Bf)
この第4実施例において、前側レンズ群GFと後側レンズ群GRとの軸上空気間隔d14及び後側レンズ群GRとフィルター群FLとの軸上空気間隔d17は、合焦に際して変化する。次の表11に無限遠合焦状態、中間撮影距離合焦状態及び近距離合焦状態における各群間隔を示す。 In the fourth embodiment, the axial air distance d14 between the front lens group GF and the rear lens group GR and the axial air distance d17 between the rear lens group GR and the filter group FL change during focusing. Table 11 below shows each group interval in the infinitely focused state, the intermediate shooting distance focused state, and the short distance focused state.
(表11)
無限遠 中間撮影距離 近距離
d14 1.2000 1.3283 3.5662
d17 7.9000 8.1808 9.4651
Bf 0.5000 0.5000 0.5000
(Table 11)
Infinity Intermediate shooting distance Short distance
d14 1.2000 1.3283 3.5662
d17 7.9000 8.1808 9.4651
Bf 0.5000 0.5000 0.5000
次の表12に、この第4実施例における各条件式対応値を示す。 Table 12 below shows values corresponding to the conditional expressions in the fourth embodiment.
(表12)
ν1=67.87
ν2=67.87
γF1=-0.4091
γR1=-0.2808
n1=1.59319
n2=1.59319
γF2=-3.9313
γR2=-1.5651
n8=1.88300
n9=1.80518
ν8=40.76
ν9=25.42
r8=10.4447
f=32.0001
fR=39.1379
(1)(ν1+ν2)/2=67.87
(2)γR1/γF1=0.6864
(3)(n1+n2)/2=1.59319
(4)γR2/γF2=0.3981
(5)n8 > n9:1.88300>1.80518
(6)ν8 > ν9:40.76>25.42
(7)r8/f=0.3264
(8)fR/f=1.2231
(Table 12)
ν1 = 67.87
ν2 = 67.87
γF1 = -0.4091
γR1 = -0.2808
n1 = 1.59319
n2 = 1.59319
γF2 = -3.9313
γR2 = -1.5651
n8 = 1.88300
n9 = 1.80518
ν8 = 40.76
ν9 = 25.42
r8 = 10.4447
f = 32.0001
fR = 39.1379
(1) (ν1 + ν2) /2=67.87
(2) γR1 / γF1 = 0.6864
(3) (n1 + n2) /2=1.59319
(4) γR2 / γF2 = 0.3981
(5) n8> n9: 1.88300> 1.80518
(6) ν8> ν9: 40.76> 25.42
(7) r8 / f = 0.264
(8) fR / f = 1.2231
この第4実施例の諸収差図を図8に示す。図8(a)は無限遠合焦状態における諸収差図であり、図8(b)は撮影倍率−0.01倍に合焦したときの中間撮影距離合焦状態における諸収差図であり、図8(c)は撮影倍率−0.07倍に合焦したときの近距離合焦状態における諸収差図である。この収差図から明らかなように、第4実施例では、各合焦状態において、諸収差が良好に補正され、優れた結像性能を有することがわかる。 The aberration diagrams of the fourth example are shown in FIG. FIG. 8A is a diagram of various aberrations in the infinitely focused state, and FIG. 8B is a diagram of various aberrations in the intermediate shooting distance in-focus state when focusing at a shooting magnification of -0.01 times. FIG. 8C is a diagram illustrating various aberrations in a short-distance in-focus state when focusing is performed at a photographing magnification of −0.07. As is apparent from this aberration diagram, in the fourth example, it is understood that various aberrations are satisfactorily corrected and excellent imaging performance is obtained in each in-focus state.
SL(SL1〜SL4) 撮影レンズ
GF 前側レンズ群 GR 後側レンズ群
G1 第1レンズ成分 G2 第2レンズ成分
G3 第3レンズ成分 G4 前側負レンズ成分(第4レンズ成分)
G5 後側負レンズ成分(第5レンズ成分)
G6 後側正レンズ成分(第6レンズ成分) G56 接合レンズ
G7 第7レンズ成分
G8 正レンズ G9 負レンズ G89 接合レンズ
S 開口絞り
1 電子スチルカメラ(光学機器)
SL (SL1 to SL4) Shooting lens GF Front lens group GR Rear lens group G1 First lens component G2 Second lens component G3 Third lens component G4 Front negative lens component (fourth lens component)
G5 Rear negative lens component (5th lens component)
G6 Rear positive lens component (sixth lens component) G56 Joint lens G7 Seventh lens component G8 Positive lens G9 Negative lens G89 Joint lens S Aperture stop 1 Electronic still camera (optical equipment)
Claims (21)
前記前側レンズ群は、開口絞りより物体側に、正の屈折力を有する第1レンズ成分と、正の屈折力を有する第2レンズ成分とを有し、
前記後側レンズ群は、物体側より順に、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し、
無限遠から近距離物体に合焦するときに、前記前側レンズ群と前記後側レンズ群との間隔が変化し、
前記第1レンズ成分のd線に対するアッベ数をν1とし、前記第2レンズ成分のd線に対するアッベ数をν2とし、無限遠から撮影倍率−0.01倍に合焦するときの前記前側レンズ群の移動量をγF1とし、無限遠から撮影倍率−0.01倍に合焦するときの前記後側レンズ群の移動量をγR1とし、無限遠から撮影倍率−0.07倍に合焦するときの前記前側レンズ群の移動量をγF2とし、無限遠から撮影倍率−0.07倍に合焦するときの前記後側レンズ群の移動量をγR2としたとき、次式
(ν1+ν2)/2 > 60
0.35 < γR1/γF1 < 0.80
0.35 < γR2/γF2 ≦ 0.4416
の条件を満足する撮影レンズ。 In order from the object side, the lens unit consists essentially of two lens groups, a front lens group having a positive refractive power and a rear lens group having a positive refractive power,
The front lens group has a first lens component having a positive refractive power and a second lens component having a positive refractive power on the object side from the aperture stop,
The rear lens group has a cemented lens in which a positive lens and a negative lens are bonded in order from the object side,
When focusing on an object at a short distance from infinity, the distance between the front lens group and the rear lens group changes,
The Abbe number of the first lens component with respect to the d-line is ν1, the Abbe number of the second lens component with respect to the d-line is ν2, and the front lens group is focused from infinity to a photographing magnification of −0.01 times. The amount of movement is γF1, the amount of movement of the rear lens group when focusing from infinity to a photographing magnification of -0.01 times is γR1, and the front side when focusing from infinity to a photographing magnification of -0.07 times. When the movement amount of the lens unit is γF2, and the movement amount of the rear lens unit when focusing from infinity to a photographing magnification of −0.07 is γR2 , the following equation (ν1 + ν2) / 2> 60
0.35 <γR1 / γF1 <0.80
0.35 <γR2 / γF2 ≦ 0.4416
Shooting lens that satisfies the above conditions.
前記前側レンズ群は、最も物体側より順に、正の屈折力を有する第1レンズ成分と、正の屈折力を有する第2レンズ成分とを有し、
前記後側レンズ群は、物体側より順に、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し、
無限遠から近距離物体に合焦するときに、前記前側レンズ群と前記後側レンズ群との間隔が変化し、
前記第1レンズ成分のd線に対するアッベ数をν1とし、前記第2レンズ成分のd線に対するアッベ数をν2とし、無限遠から撮影倍率−0.01倍に合焦するときの前記前側レンズ群の移動量をγF1とし、無限遠から撮影倍率−0.01倍に合焦するときの前記後側レンズ群の移動量をγR1とし、無限遠から撮影倍率−0.07倍に合焦するときの前記前側レンズ群の移動量をγF2とし、無限遠から撮影倍率−0.07倍に合焦するときの前記後側レンズ群の移動量をγR2としたとき、次式
(ν1+ν2)/2 > 60
0.35 < γR1/γF1 < 0.80
0.35 < γR2/γF2 ≦ 0.4416
の条件を満足する撮影レンズ。 In order from the object side, the lens unit consists essentially of two lens groups, a front lens group having a positive refractive power and a rear lens group having a positive refractive power,
The front lens group includes, in order from the most object side, a first lens component having a positive refractive power and a second lens component having a positive refractive power,
The rear lens group has a cemented lens in which a positive lens and a negative lens are bonded in order from the object side,
When focusing on an object at a short distance from infinity, the distance between the front lens group and the rear lens group changes,
The Abbe number of the first lens component with respect to the d-line is ν1, the Abbe number of the second lens component with respect to the d-line is ν2, and the front lens group is focused from infinity to a photographing magnification of −0.01 times. The amount of movement is γF1, the amount of movement of the rear lens group when focusing from infinity to a photographing magnification of -0.01 times is γR1, and the front side when focusing from infinity to a photographing magnification of -0.07 times. When the movement amount of the lens unit is γF2, and the movement amount of the rear lens unit when focusing from infinity to a photographing magnification of −0.07 is γR2 , the following equation (ν1 + ν2) / 2> 60
0.35 <γR1 / γF1 <0.80
0.35 <γR2 / γF2 ≦ 0.4416
Shooting lens that satisfies the above conditions.
前記前側レンズ群は、開口絞りより物体側に、正の屈折力を有する第1レンズ成分と、正の屈折力を有する第2レンズ成分とを有し、
前記後側レンズ群は、物体側より順に、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し、
無限遠から近距離物体に合焦するときに、前記前側レンズ群と前記後側レンズ群との間隔が変化し、
前記第1レンズ成分のd線に対するアッベ数をν1とし、前記第2レンズ成分のd線に対するアッベ数をν2とし、無限遠から撮影倍率−0.01倍に合焦するときの前記前側レンズ群の移動量をγF1とし、無限遠から撮影倍率−0.01倍に合焦するときの前記後側レンズ群の移動量をγR1とし、前記接合レンズの最も像側に配置された前記負レンズのd線に対する屈折率をn9、アッベ数をν9とし、当該負レンズの物体側に貼り合わされた前記正レンズのd線に対する屈折率をn8、アッベ数をν8としたとき、次式
(ν1+ν2)/2 > 60
0.35 < γR1/γF1 < 0.80
n8 > n9
ν8 > ν9
の条件を満足する撮影レンズ。 In order from the object side, the lens unit consists essentially of two lens groups, a front lens group having a positive refractive power and a rear lens group having a positive refractive power,
The front lens group has a first lens component having a positive refractive power and a second lens component having a positive refractive power on the object side from the aperture stop,
The rear lens group has a cemented lens in which a positive lens and a negative lens are bonded in order from the object side,
When focusing on an object at a short distance from infinity, the distance between the front lens group and the rear lens group changes,
The Abbe number of the first lens component with respect to the d-line is ν1, the Abbe number of the second lens component with respect to the d-line is ν2, and the front lens group is focused from infinity to a photographing magnification of −0.01 times. The amount of movement is γF1, the amount of movement of the rear lens group when focusing from infinity to a photographing magnification of −0.01 times is γR1, and the d-line of the negative lens arranged closest to the image side of the cemented lens Where n9 is the refractive index and n9 is the Abbe number, and n8 is the refractive index of the positive lens bonded to the object side of the negative lens and the Abbe number is ν8 , the following equation (ν1 + ν2) / 2> 60
0.35 <γR1 / γF1 <0.80
n8> n9
ν8> ν9
Shooting lens that satisfies the above conditions.
前記前側レンズ群は、最も物体側より順に、正の屈折力を有する第1レンズ成分と、正の屈折力を有する第2レンズ成分とを有し、
前記後側レンズ群は、物体側より順に、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し、
無限遠から近距離物体に合焦するときに、前記前側レンズ群と前記後側レンズ群との間隔が変化し、
前記第1レンズ成分のd線に対するアッベ数をν1とし、前記第2レンズ成分のd線に対するアッベ数をν2とし、無限遠から撮影倍率−0.01倍に合焦するときの前記前側レンズ群の移動量をγF1とし、無限遠から撮影倍率−0.01倍に合焦するときの前記後側レンズ群の移動量をγR1とし、前記接合レンズの最も像側に配置された前記負レンズのd線に対する屈折率をn9、アッベ数をν9とし、当該負レンズの物体側に貼り合わされた前記正レンズのd線に対する屈折率をn8、アッベ数をν8としたとき、次式
(ν1+ν2)/2 > 60
0.35 < γR1/γF1 < 0.80
n8 > n9
ν8 > ν9
の条件を満足する撮影レンズ。 In order from the object side, the lens unit consists essentially of two lens groups, a front lens group having a positive refractive power and a rear lens group having a positive refractive power,
The front lens group includes, in order from the most object side, a first lens component having a positive refractive power and a second lens component having a positive refractive power,
The rear lens group has a cemented lens in which a positive lens and a negative lens are bonded in order from the object side,
When focusing on an object at a short distance from infinity, the distance between the front lens group and the rear lens group changes,
The Abbe number of the first lens component with respect to the d-line is ν1, the Abbe number of the second lens component with respect to the d-line is ν2, and the front lens group is focused from infinity to a photographing magnification of −0.01 times. The amount of movement is γF1, the amount of movement of the rear lens group when focusing from infinity to a photographing magnification of −0.01 times is γR1, and the d-line of the negative lens arranged closest to the image side of the cemented lens Where n9 is the refractive index and n9 is the Abbe number, and n8 is the refractive index of the positive lens bonded to the object side of the negative lens and the Abbe number is ν8 , the following equation (ν1 + ν2) / 2> 60
0.35 <γR1 / γF1 <0.80
n8> n9
ν8> ν9
Shooting lens that satisfies the above conditions.
前記前側レンズ群は、開口絞りより物体側に、正の屈折力を有する第1レンズ成分と、正の屈折力を有する第2レンズ成分とを有し、
前記後側レンズ群は、物体側より順に、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し、
前記第2レンズ成分と前記接合レンズとの間に、物体側より順に、負の屈折力を有する前側負レンズ成分と、開口絞りと、負の屈折力を有する後側負レンズ成分と、正の屈折力を有する後側正レンズ成分とを有し、
前記第2レンズ成分と前記前側負レンズ成分との間に、物体側に凸面を向けたメニスカス形状の第3レンズ成分を有し、
無限遠から近距離物体に合焦するときに、前記前側レンズ群と前記後側レンズ群との間隔が変化し、
前記第1レンズ成分のd線に対するアッベ数をν1とし、前記第2レンズ成分のd線に対するアッベ数をν2とし、無限遠から撮影倍率−0.01倍に合焦するときの前記前側レンズ群の移動量をγF1とし、無限遠から撮影倍率−0.01倍に合焦するときの前記後側レンズ群の移動量をγR1としたとき、次式
(ν1+ν2)/2 > 60
0.35 < γR1/γF1 < 0.80
の条件を満足する撮影レンズ。 In order from the object side, the lens unit consists essentially of two lens groups, a front lens group having a positive refractive power and a rear lens group having a positive refractive power,
The front lens group has a first lens component having a positive refractive power and a second lens component having a positive refractive power on the object side from the aperture stop,
The rear lens group has a cemented lens in which a positive lens and a negative lens are bonded in order from the object side,
Between the second lens component and the cemented lens, in order from the object side, a front negative lens component having a negative refractive power, an aperture stop, a rear negative lens component having a negative refractive power, and a positive A rear positive lens component having refractive power,
A meniscus third lens component with a convex surface facing the object side between the second lens component and the front negative lens component;
When focusing on an object at a short distance from infinity, the distance between the front lens group and the rear lens group changes,
The Abbe number of the first lens component with respect to the d-line is ν1, the Abbe number of the second lens component with respect to the d-line is ν2, and the front lens group is focused from infinity to a photographing magnification of −0.01 times. When the amount of movement is γF1, and the amount of movement of the rear lens group when focusing from infinity to a photographing magnification of −0.01 times is γR1, the following equation (ν1 + ν2) / 2> 60
0.35 <γR1 / γF1 <0.80
Shooting lens that satisfies the above conditions.
前記前側レンズ群は、最も物体側より順に、正の屈折力を有する第1レンズ成分と、正の屈折力を有する第2レンズ成分とを有し、
前記後側レンズ群は、物体側より順に、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し、
前記第2レンズ成分と前記接合レンズとの間に、物体側より順に、負の屈折力を有する前側負レンズ成分と、開口絞りと、負の屈折力を有する後側負レンズ成分と、正の屈折力を有する後側正レンズ成分とを有し、
前記第2レンズ成分と前記前側負レンズ成分との間に、物体側に凸面を向けたメニスカス形状の第3レンズ成分を有し、
無限遠から近距離物体に合焦するときに、前記前側レンズ群と前記後側レンズ群との間隔が変化し、
前記第1レンズ成分のd線に対するアッベ数をν1とし、前記第2レンズ成分のd線に対するアッベ数をν2とし、無限遠から撮影倍率−0.01倍に合焦するときの前記前側レンズ群の移動量をγF1とし、無限遠から撮影倍率−0.01倍に合焦するときの前記後側レンズ群の移動量をγR1としたとき、次式
(ν1+ν2)/2 > 60
0.35 < γR1/γF1 < 0.80
の条件を満足する撮影レンズ。 In order from the object side, the lens unit consists essentially of two lens groups, a front lens group having a positive refractive power and a rear lens group having a positive refractive power,
The front lens group includes, in order from the most object side, a first lens component having a positive refractive power and a second lens component having a positive refractive power,
The rear lens group has a cemented lens in which a positive lens and a negative lens are bonded in order from the object side,
Between the second lens component and the cemented lens, in order from the object side, a front negative lens component having a negative refractive power, an aperture stop, a rear negative lens component having a negative refractive power, and a positive A rear positive lens component having refractive power,
A meniscus third lens component with a convex surface facing the object side between the second lens component and the front negative lens component;
When focusing on an object at a short distance from infinity, the distance between the front lens group and the rear lens group changes,
The Abbe number of the first lens component with respect to the d-line is ν1, the Abbe number of the second lens component with respect to the d-line is ν2, and the front lens group is focused from infinity to a photographing magnification of −0.01 times. When the amount of movement is γF1, and the amount of movement of the rear lens group when focusing from infinity to a photographing magnification of −0.01 times is γR1, the following equation (ν1 + ν2) / 2> 60
0.35 <γR1 / γF1 <0.80
Shooting lens that satisfies the above conditions.
n8 > n9
ν8 > ν9
の条件を満足する請求項1または2に記載の撮影レンズ。 The refractive index for the d-line of the negative lens arranged closest to the image side of the cemented lens is n9, the Abbe number is ν9, and the refractive index for the d-line of the positive lens bonded to the object side of the negative lens is n8. When the Abbe number is ν8, the following formula n8> n9
ν8> ν9
Photographing lens according to claim 1 or 2 to satisfy the condition.
0.35 < γR2/γF2 < 0.50
の条件を満足する請求項3または4に記載の撮影レンズ。 When focusing from infinity to a photographing magnification of -0.07, when the movement amount of the front lens group is γF2 and the movement amount of the rear lens group is γR2, the following expression 0.35 <γR2 / γF2 <0.50
The photographic lens according to claim 3 or 4 , which satisfies the following condition.
物体側より順に、負の屈折力を有する前側負レンズ成分と、開口絞りと、負の屈折力を有する後側負レンズ成分と、正の屈折力を有する後側正レンズ成分とを有する請求項1〜4、7、8のいずれか一項に記載の撮影レンズ。 Between the second lens component and the cemented lens,
A front negative lens component having negative refractive power, an aperture stop, a rear negative lens component having negative refractive power, and a rear positive lens component having positive refractive power in order from the object side. The photographing lens according to any one of 1 to 4, 7, and 8.
0.35 < γR2/γF2 < 0.50
の条件を満足する請求項5または6に記載の撮影レンズ。 When focusing from infinity to a photographing magnification of -0.07, when the movement amount of the front lens group is γF2 and the movement amount of the rear lens group is γR2, the following expression 0.35 <γR2 / γF2 <0.50
The photographic lens according to claim 5 or 6 , which satisfies the following condition.
物体側に凸面を向けたメニスカス形状の第3レンズ成分を有する請求項1〜4、7〜9のいずれか一項に記載の撮影レンズ。 Between the second lens component and the front negative lens component,
The taking lens according to any one of claims 1 to 4 and 7 to 9, which has a meniscus third lens component having a convex surface facing the object side.
前記後側負レンズ成分は、両凹形状の第5レンズ成分である請求項5、6、9〜11のいずれか一項に記載の撮影レンズ。 The front negative lens component is a meniscus fourth lens component having a convex surface facing the object side,
The photographing lens according to any one of claims 5, 6, and 9 to 11 , wherein the rear negative lens component is a biconcave fifth lens component.
正の屈折力を有する第7レンズ成分を有する請求項5、6、9〜12のいずれか一項に記載の撮影レンズ。 Between the sixth lens component as the rear positive lens component and the cemented lens,
The taking lens according to any one of claims 5, 6, and 9 to 12, comprising a seventh lens component having a positive refractive power.
0.30 < r8/f < 0.50
の条件を満足する請求項5、6、9〜14のいずれか一項に記載の撮影レンズ。 When the radius of curvature of the image-side surface of the front negative lens component is r8 and the focal length of the entire photographing lens system is f, the following expression 0.30 <r8 / f <0.50
The photographic lens according to claim 5, wherein the photographic lens satisfies the following condition.
(n1+n2)/2 > 1.49
の条件を満足する請求項1〜15のいずれか一項に記載の撮影レンズ。 When the refractive index of the first lens component with respect to the d-line is n1, and the refractive index of the second lens component with respect to the d-line is n2, the following formula (n1 + n2) / 2> 1.49.
The photographic lens according to any one of claims 1 to 15, which satisfies the following condition.
1.00 < fR/f < 2.00
の条件を満足する請求項1〜18のいずれか一項に記載の撮影レンズ。 When the focal length of the rear lens group is fR and the focal length of the entire photographing lens system is f, the following expression 1.00 <fR / f <2.00
Photographing lens according to any one of claims 1 to 18 that satisfies the condition.
前記前側レンズ群は、開口絞りより物体側に、正の屈折力を有する第1レンズ成分と、正の屈折力を有する第2レンズ成分とを有し、
前記後側レンズ群は、物体側より順に、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し、
無限遠から近距離物体に合焦するときに、前記前側レンズ群と前記後側レンズ群との間隔が変化し、
前記第1レンズ成分のd線に対するアッベ数をν1とし、前記第2レンズ成分のd線に対するアッベ数をν2とし、無限遠から撮影倍率−0.01倍に合焦するときの前記前側レンズ群の移動量をγF1とし、無限遠から撮影倍率−0.01倍に合焦するときの前記後側レンズ群の移動量をγR1とし、無限遠から撮影倍率−0.07倍に合焦するときの前記前側レンズ群の移動量をγF2とし、無限遠から撮影倍率−0.07倍に合焦するときの前記後側レンズ群の移動量をγR2としたとき、次式
(ν1+ν2)/2 > 60
0.35 < γR1/γF1 < 0.80
0.35 < γR2/γF2 ≦ 0.4416
の条件を満足する撮影レンズを用いた結像方法。 In order from the object side, the lens unit consists essentially of two lens groups, a front lens group having a positive refractive power and a rear lens group having a positive refractive power,
The front lens group has a first lens component having a positive refractive power and a second lens component having a positive refractive power on the object side from the aperture stop ,
The rear lens group has a cemented lens in which a positive lens and a negative lens are bonded in order from the object side,
When focusing on an object at a short distance from infinity, the distance between the front lens group and the rear lens group changes,
The Abbe number of the first lens component with respect to the d-line is ν1, the Abbe number of the second lens component with respect to the d-line is ν2, and the front lens group is focused from infinity to a photographing magnification of −0.01 times. The amount of movement is γF1, the amount of movement of the rear lens group when focusing from infinity to a photographing magnification of -0.01 times is γR1, and the front side when focusing from infinity to a photographing magnification of -0.07 times. When the movement amount of the lens unit is γF2, and the movement amount of the rear lens unit when focusing from infinity to a photographing magnification of −0.07 is γR2 , the following equation (ν1 + ν2) / 2> 60
0.35 <γR1 / γF1 <0.80
0.35 <γR2 / γF2 ≦ 0.4416
An imaging method using a photographic lens that satisfies the above conditions.
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US12/369,776 US8427763B2 (en) | 2008-02-12 | 2009-02-12 | Lens system, optical device with lens system, and method of manufacturing lens system |
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US13/801,389 US8630046B2 (en) | 2008-02-12 | 2013-03-13 | Lens system, optical device with lens system, and method of manufacturing lens system |
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