JP4147615B2 - Wide converter lens - Google Patents
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- JP4147615B2 JP4147615B2 JP10680798A JP10680798A JP4147615B2 JP 4147615 B2 JP4147615 B2 JP 4147615B2 JP 10680798 A JP10680798 A JP 10680798A JP 10680798 A JP10680798 A JP 10680798A JP 4147615 B2 JP4147615 B2 JP 4147615B2
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Description
【０００１】
【発明の属する技術分野】
本発明は、撮影レンズの物体側に取り付けて全系の焦点距離を短くし、撮影画角を広げるためのワイドコンバーターレンズに関し、特に小型で構成枚数が少ないワイドコンバーターレンズに関する。
【０００２】
【従来の技術】
従来から、撮影レンズの物体側に取り付けて用いるワイドコンバーターレンズは数多く提案されており、なかでも負レンズと正レンズの２枚の構成でアフォーカル系を形成するワイドコンバーターレンズは特開平１−３１９０１０、特開平３−１３１８１０、特開平４−７０６１６、特開平４−１９１７１８、特開平５−２６４９０１、特開平６−１３８３８９、特開平７−２０９５８０などが提案されている。
【０００３】
【発明が解決しようとする課題】
しかしながら、特開平１−３１９０１０においては、非球面レンズを用いており、低コスト化が困難であった、さらに最大撮影画角が６５°程度と小さく、ワイド化が不十分であった。特開平３−１３１８１０においては、ワイドコンバーター装着時の撮影画角が７０°程度と小さく、ワイド化が不十分であった。特開平４−７０６１６においても、ワイドコンバーター装着時の撮影画角が７５°程度と小さく、ワイド化が不十分であった。特開平４−１９１７１８においても、ワイドコンバーター装着時の撮影画角が６４°程度と小さく、ワイド化が不十分であった。特開平５−２６４９０１においても、ワイドコンバーター装着時の撮影画角が７０°程度と小さく、ワイド化が不十分であった。特開平６−１３８３８９においても、ワイドコンバーター装着時の撮影画角が７４°程度と小さく、ワイド化が不十分であった。特開平７−２０９５８０においても、ワイドコンバーター装着時の撮影画角が７６°程度と小さく、ワイド化が不十分であった。
【０００４】
そこで本発明においては、小型で構成枚数が２枚と少ないにもかかわらず、撮影画角が８０°程度以上で、低コストなワイドコンバーターレンズの提供を目的としている。
【０００５】
【課題を解決するための手段】
本発明にかかるワイドコンバーターレンズは、撮影レンズの物体側に装着して用いられ、物体側より順に、物体側に凸面を向けた負メニスカスレンズと、物体側の面と像側の面との曲率半径の絶対値が等しい両凸レンズとからなり、全体としてアフォーカル系を構成し、以下の条件式を満足することにより、課題の解決を図るものである。
（１） １．５＜（ｒ１＋ｒ２）／（ｒ１−ｒ２）＜ ２．５
（２） ０．８＜ｒ２／ｄ２＜１．５
（３） ０．１５＜ｒ２／ｒ３＜０．５
但し、
ｒ１ ：前記負メニスカスレンズの物体側の面の曲率半径
ｒ２ ：前記負メニスカスレンズの像側の面の曲率半径
ｒ３ ：前記両凸レンズの物体側の面の曲率半径
ｄ２ ：前記負メニスカスレンズと前記両凸レンズとの間の空気間隔
【０００６】
【発明の実施の形態】
ワイドコンバーターレンズを低コストで構成するには、物体側から順に、負レンズと正レンズの２枚構成とするのが好ましい。この際に、負レンズを物体側に凸面を向けたメニスカス形状とすることで、非点収差や倍率色収差などの軸収差の劣化を小さく抑えることが可能となる。また、正レンズを物体側の面と像側の面との曲率半径の絶対値が等しい両凸レンズとすることで、レンズ部品の研摩・芯取り工程や、コンバーターレンズ組み立て工程の簡素化がはかれ、低コスト化に有利である。
【０００７】
そして本発明においては、条件式（１）乃至条件式（３）を満足することが望ましい。
条件式（１）は前記負メニスカスレンズの適切な形状を規定する。条件式（１）の下限を下回ると、非点収差や倍率色収差などの軸収差の劣化が大きくなり好ましくない。反対に、条件式（１）の上限を上回ると、レンズの研摩や芯取りが困難となり低コスト化に反する。
【０００８】
条件式（２）は前記負メニスカスレンズの像側の面の曲率半径と、前記負メニスカスレンズと前記両凸レンズとの間の空気間隔の適切な関係を規定する。条件式（２）の下限を下回ると、前記負メニスカスレンズの像側の面の曲率半径が小さくなりすぎて研摩が困難となり低コスト化に反する。あるいは、前記負メニスカスレンズと前記両凸レンズとの間の空気間隔が大きくなり、コンバーターレンズ全体の小型化に反する。反対に、条件式（２）の上限を上回ると、前記負メニスカスレンズの像側の面の曲率半径が大きくなるか、あるいは前記負メニスカスレンズと前記両凸レンズとの間の空気間隔が小さくなる。どちらの場合でも、画質の劣化を小さく抑えつつ、８０°程度以上の撮影画角を確保するのが困難となる。
【０００９】
条件式（３）は前記負メニスカスレンズの像側の面の曲率半径と、前記両凸レンズの物体側の面の曲率半径の比の適切な値を規定する。条件式（３）の下限、上限のいずれを外れても、前記負メニスカスレンズで発生する正の球面収差と前記両凸レンズで発生する負の球面収差をバランス良く相殺することが困難になる。
【００１０】
【実施例】
以下に，本発明の実施例について説明する。
図１は本発明の実施例１のワイドコンバーターレンズＡをマスターレンズＢに装着したときのレンズ断面図を示す図である。本実施例は物体側から順に、物体側に凸面を向けた負メニスカスレンズＬ１と、物体側の面と像側の面との曲率半径の絶対値が等しい両凸レンズＬ２とからなり、全体としてアフォーカル系を構成する。
【００１１】
図２は本発明の実施例２のワイドコンバーターレンズＡをマスターレンズＢに装着したときのレンズ断面図を示す図である。本実施例は物体側から順に、物体側に凸面を向けた負メニスカスレンズＬ１と、物体側の面と像側の面との曲率半径の絶対値が等しい両凸レンズＬ２とからなり、全体としてアフォーカル系を構成する。
【００１２】
以下の表１乃至２に、本発明の実施例１乃至２の数値実施例を掲げる。
［表１］
（実施例１）
アフォーカル倍率ｍ＝０．６６５ 撮影画角２ω＝９１．８°
（実施例２）
アフォーカル倍率ｍ＝０．６８９ 撮影画角２ω＝８７．５°
【００１３】
非球面形状は以下の式で定義される。
Ｚ（ｙ）＝ｙ**２／ｒ／｛１＋（１−Ｋ・ｙ**２／ｒ**２）｝＋Ｃ４・ｙ**４＋Ｃ６・ｙ**６＋Ｃ８・ｙ**８＋Ｃ１０・ｙ**１０
（但し、以下全て、ａ**ｂの表記はａのｂ乗を表わす。）
但し、ｙは光軸からの高さ、Ｚ（ｙ）は光軸からの高さｙにおける非球面上の点の、非球面頂点の接平面からの距離、ｒは非球面頂点の曲率半径、Ｋは円錐定数、Ｃ４、Ｃ６、Ｃ８、Ｃ１０はそれぞれ非球面係数である。
【００１４】
なお、ワイドコンバーターレンズＡの最も像側のレンズ面と、マスターレンズＢの最も物体側のレンズ面との空気間隔は、いずれの実施例でも０．５である。
【００１５】
【表３】
（マスターレンズ）
焦点距離ｆ＝５．９３ ＦナンバーＦno＝２．３９ 撮影画角２ω＝６４．３
Ｋ = 1.0000
Ｃ４ = 2.99060×10**-4
Ｃ６ = -3.22060×10**-6
Ｃ８ = 2.79020×10**-7
Ｃ１０= -7.93530×10**-9
以下の表３に、本発明の各実施例の条件式対応数値を示す。
［表３］
（実施例１）
（１）（ｒ１＋ｒ２）／（ｒ１−ｒ２）＝１．７７９
（２） ｒ２／ｄ２＝１．１８５
（３） ｒ２／ｒ３＝０．２９５
（実施例２）
（１）（ｒ１＋ｒ２）／（ｒ１−ｒ２）＝２．２１１
（２） ｒ２／ｄ２＝１．１２６
（３） ｒ２／ｒ３＝０．２９２
図３は本発明の実施例１のワイドコンバーターレンズＡをマスターレンズＢに装着したときの諸収差図を示し、図４は本発明の実施例２のワイドコンバーターレンズＡをマスターレンズＢに装着したときの諸収差図を示し、図５はマスターレンズＢ単体での諸収差図を示す。各収差図において、ＦNOはＦナンバー、Ｈは像高、ｄはｄ線（λ=587.6nm）及びｇはｇ線（λ=435.6nm）を示している。非点収差図において、実線はサジタル像面を、破線はメリジオナル像面をそれぞれ示す。
【００１６】
図６は本発明の実施例１のワイドコンバーターレンズＡをマスターレンズＢに装着したときのＭＴＦを示す図であり、図７は本発明の実施例２のワイドコンバーターレンズＡをマスターレンズＢに装着したときのＭＴＦを示す図であり、図８はマスターレンズＢ単体でのＭＴＦを示す図である。ＭＴＦを示す図において、実線はサジタル方向のＭＴＦを、破線はメリジオナル方向のＭＴＦをそれぞれ示す。なお、ＭＴＦの値は、６０本/mmでの白色ＭＴＦの値である。
【００１７】
各収差図およびＭＴＦを示す図から、各実施例は諸収差が良好に補正され、マスターレンズの性能を低下させることが少なく、優れた結像性能を有していることが明らかである。
【００１８】
【発明の効果】
本発明によれば、小型で構成枚数が少なく、８０°程度以上の撮影画角を有し、低コストで高性能なワイドコンバーターレンズの提供が可能となる。
【図面の簡単な説明】
【図１】本発明の実施例１のワイドコンバーターレンズをマスターレンズに装着した状態を示す図。
【図２】本発明の実施例２のワイドコンバーターレンズをマスターレンズに装着した状態を示す図。
【図３】本発明の実施例１のワイドコンバーターレンズをマスターレンズに装着した状態での諸収差図。
【図４】本発明の実施例２のワイドコンバーターレンズをマスターレンズに装着した状態での諸収差図。
【図５】マスターレンズ単体での諸収差図。
【図６】本発明の実施例１のワイドコンバーターレンズをマスターレンズに装着した状態でのＭＴＦを示す図。
【図７】本発明の実施例２のワイドコンバーターレンズをマスターレンズに装着した状態でのＭＴＦを示す図。
【図８】マスターレンズ単体でのＭＴＦを示す図。
【符合の説明】
Ａ ワイドコンバーターレンズ
Ｂ マスターレンズ
Ｌ１ 負メニスカスレンズ
Ｌ２ 両凸レンズ
Ｓ 絞り[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wide converter lens that is attached to the object side of a photographic lens to shorten the focal length of the entire system and widen the photographic angle of view, and more particularly to a small-sized wide converter lens having a small number of components.
[0002]
[Prior art]
Conventionally, many wide converter lenses that are attached to the object side of the photographic lens have been proposed. Among them, a wide converter lens that forms an afocal system with two negative lenses and a positive lens is disclosed in Japanese Patent Laid-Open No. 1-319010. JP-A-3-131810, JP-A-4-70616, JP-A-4-191718, JP-A-5-264901, JP-A-6-138389, JP-A-7-209580 and the like have been proposed.
[0003]
[Problems to be solved by the invention]
However, in JP-A-1-319010, an aspheric lens is used, and it is difficult to reduce the cost. Further, the maximum shooting angle of view is as small as about 65 °, and the widening is insufficient. In Japanese Patent Laid-Open No. 3-131810, the shooting angle of view when the wide converter is mounted is as small as about 70 °, and the widening is insufficient. In Japanese Patent Laid-Open No. 4-70616, the shooting angle of view when the wide converter is mounted is as small as about 75 °, and the widening is insufficient. In Japanese Patent Laid-Open No. 4-191718, the shooting angle of view when the wide converter is mounted is as small as about 64 °, and the widening is insufficient. In Japanese Patent Laid-Open No. 5-264901, the shooting angle of view when the wide converter is mounted is as small as about 70 °, and the widening is insufficient. In Japanese Patent Laid-Open No. 6-138389, the shooting angle of view when the wide converter is mounted is as small as about 74 °, and the widening is insufficient. In Japanese Patent Laid-Open No. 7-209580, the shooting angle of view when the wide converter is mounted is as small as about 76 °, and the widening is insufficient.
[0004]
Accordingly, an object of the present invention is to provide a low-cost wide converter lens having a shooting angle of view of about 80 ° or more despite its small size and the small number of components.
[0005]
[Means for Solving the Problems]
The wide converter lens according to the present invention is used by being mounted on the object side of the photographing lens, and in order from the object side, a negative meniscus lens having a convex surface facing the object side, and a curvature of the object side surface and the image side surface. It consists of a biconvex lens with the same absolute value of radius and constitutes an afocal system as a whole and satisfies the following conditional expression to solve the problem.
(1) 1.5 <(r1 + r2) / (r1-r2) <2.5
(2) 0.8 <r2 / d2 <1.5
(3) 0.15 <r2 / r3 <0.5
However,
r1: radius of curvature of the object side surface of the negative meniscus lens r2: radius of curvature of the image side surface of the negative meniscus lens r3: radius of curvature of the object side surface of the biconvex lens d2: the negative meniscus lens and the both Air spacing between convex lenses [0006]
DETAILED DESCRIPTION OF THE INVENTION
In order to configure the wide converter lens at a low cost, it is preferable to configure the negative lens and the positive lens in order from the object side. At this time, by making the negative lens have a meniscus shape with the convex surface facing the object side, it is possible to suppress deterioration of axial aberrations such as astigmatism and lateral chromatic aberration. In addition, by making the positive lens a biconvex lens with the same absolute value of the radius of curvature of the object side surface and the image side surface, it is possible to simplify the polishing and centering process of the lens parts and the converter lens assembly process. This is advantageous for cost reduction.
[0007]
In the present invention, it is desirable to satisfy conditional expressions (1) to (3).
Conditional expression (1) defines an appropriate shape of the negative meniscus lens. If the lower limit of conditional expression (1) is not reached, the deterioration of axial aberrations such as astigmatism and lateral chromatic aberration increases, which is not preferable. On the other hand, if the upper limit of conditional expression (1) is exceeded, it will be difficult to polish and center the lens, which is contrary to cost reduction.
[0008]
Conditional expression (2) defines an appropriate relationship between the radius of curvature of the image side surface of the negative meniscus lens and the air spacing between the negative meniscus lens and the biconvex lens. If the lower limit of conditional expression (2) is not reached, the radius of curvature of the image side surface of the negative meniscus lens becomes too small, making polishing difficult and contrary to cost reduction. Or the air space | interval between the said negative meniscus lens and the said biconvex lens becomes large, and it is contrary to size reduction of the whole converter lens. On the other hand, when the upper limit of conditional expression (2) is exceeded, the radius of curvature of the image side surface of the negative meniscus lens increases, or the air space between the negative meniscus lens and the biconvex lens decreases. In either case, it is difficult to secure a shooting angle of view of about 80 ° or more while suppressing deterioration in image quality.
[0009]
Conditional expression (3) defines an appropriate value of the ratio of the radius of curvature of the image side surface of the negative meniscus lens and the radius of curvature of the object side surface of the biconvex lens. Regardless of the lower limit or the upper limit of conditional expression (3), it becomes difficult to offset the positive spherical aberration generated in the negative meniscus lens and the negative spherical aberration generated in the biconvex lens in a balanced manner.
[0010]
【Example】
Examples of the present invention will be described below.
1 is a cross-sectional view of a lens when the wide converter lens A of Example 1 of the present invention is mounted on a master lens B. FIG. In this embodiment, in order from the object side, a negative meniscus lens L1 having a convex surface directed toward the object side and a biconvex lens L2 having the same absolute value of the radius of curvature of the object side surface and the image side surface are arranged as a whole. Construct a focal system.
[0011]
FIG. 2 is a diagram showing a lens cross-sectional view when the wide converter lens A of Example 2 of the present invention is mounted on the master lens B. FIG. In this embodiment, in order from the object side, a negative meniscus lens L1 having a convex surface directed toward the object side and a biconvex lens L2 having the same absolute value of the radius of curvature of the object side surface and the image side surface are arranged as a whole. Construct a focal system.
[0012]
Tables 1 and 2 below list numerical examples of Examples 1 and 2 of the present invention.
[Table 1]
(Example 1)
Afocal magnification m = 0.665 Shooting angle of view 2ω = 91.8 °
(Example 2)
Afocal magnification m = 0.589 Shooting angle of view 2ω = 87.5 °
[0013]
The aspheric shape is defined by the following equation.
Z (y) = y ** 2 / r / {1+ (1-K · y ** 2 / r ** 2)} + C4 · y ** 4 + C6 · y ** 6 + C8 · y ** 8 + C10 · y ** 10
(However, in the following, a ** b represents a to the bth power.)
Where y is the height from the optical axis, Z (y) is the distance from the tangential plane of the aspherical vertex of the point on the aspherical surface at the height y from the optical axis, r is the radius of curvature of the aspherical vertex, K is a conic constant, and C4, C6, C8, and C10 are aspheric coefficients.
[0014]
The air space between the most image side lens surface of the wide converter lens A and the most object side lens surface of the master lens B is 0.5 in any of the embodiments.
[0015]
[Table 3]
(Master lens)
Focal length f = 5.93 F number Fno = 2.39 Shooting angle of view 2ω = 64.3
C4 = 2.99060 × 10 **-4
C6 = -3.22060 × 10 **-6
C8 = 2.79020 × 10 **-7
C10 = -7.93530 × 10 **-9
Table 3 below shows numerical values corresponding to the conditional expressions of the respective examples of the present invention.
[Table 3]
(Example 1)
(1) (r1 + r2) / (r1-r2) = 1.777
(2) r2 / d2 = 1.185
(3) r2 / r3 = 0.295
(Example 2)
(1) (r1 + r2) / (r1-r2) = 2.221
(2) r2 / d2 = 1.126
(3) r2 / r3 = 0.292
3 shows various aberration diagrams when the wide converter lens A of Example 1 of the present invention is mounted on the master lens B, and FIG. 4 shows that the wide converter lens A of Example 2 of the present invention is mounted on the master lens B. FIG. 5 is a diagram showing aberrations of the master lens B alone. In each aberration diagram, FNO is the F number, H is the image height, d is the d-line (λ = 587.6 nm), and g is the g-line (λ = 435.6 nm). In the astigmatism diagram, the solid line indicates the sagittal image plane, and the broken line indicates the meridional image plane.
[0016]
6 is a diagram showing the MTF when the wide converter lens A of Example 1 of the present invention is mounted on the master lens B, and FIG. 7 is the mount of the wide converter lens A of Example 2 of the present invention on the master lens B. FIG. 8 is a diagram showing the MTF of the master lens B alone. In the figure showing the MTF, the solid line shows the MTF in the sagittal direction, and the broken line shows the MTF in the meridional direction. The MTF value is the value of white MTF at 60 lines / mm.
[0017]
From the aberration diagrams and the MTF diagrams, it is clear that each example has excellent imaging performance because various aberrations are corrected well, the performance of the master lens is hardly lowered.
[0018]
【The invention's effect】
According to the present invention, it is possible to provide a low-cost and high-performance wide converter lens having a small size, a small number of components, a shooting field angle of about 80 ° or more, and the like.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a state in which a wide converter lens according to a first embodiment of the present invention is attached to a master lens.
FIG. 2 is a diagram illustrating a state in which a wide converter lens according to a second embodiment of the invention is attached to a master lens.
FIG. 3 is a diagram showing various aberrations when the wide converter lens of Example 1 of the present invention is attached to a master lens.
FIG. 4 is a diagram showing various aberrations when the wide converter lens of Example 2 of the present invention is attached to a master lens.
FIG. 5 is a diagram of various aberrations of the master lens alone.
FIG. 6 is a diagram showing an MTF in a state where the wide converter lens of Example 1 of the present invention is attached to a master lens.
FIG. 7 is a diagram showing an MTF in a state where the wide converter lens of Example 2 of the present invention is attached to a master lens.
FIG. 8 is a diagram showing MTF of a single master lens.
[Explanation of sign]
A Wide converter lens B Master lens L1 Negative meniscus lens L2 Biconvex lens S Aperture
Claims (1)
１．５＜（ｒ１＋ｒ２）／（ｒ１−ｒ２）＜ ２．０
０．８＜ｒ２／ｄ２＜１．５
０．１５＜ｒ２／ｒ３＜０．５
但し、
ｒ１ ：前記負メニスカスレンズの物体側の面の曲率半径
ｒ２ ：前記負メニスカスレンズの像側の面の曲率半径
ｒ３ ：前記両凸レンズの物体側の面の曲率半径
ｄ２ ：前記負メニスカスレンズと前記両凸レンズとの間の空気間隔In the wide converter lens used by attaching to the object side of the photographic lens, the absolute value of the radius of curvature between the negative meniscus lens with the convex surface facing the object side and the object side surface and the image side surface in order from the object side is A wide converter lens consisting of equal biconvex lenses, constituting an afocal system as a whole, and satisfying the following conditional expression.
1.5 <(r1 + r2) / (r1-r2) <2.0
0.8 <r2 / d2 <1.5
0.15 <r2 / r3 <0.5
However,
r1: radius of curvature of the object side surface of the negative meniscus lens r2: radius of curvature of the image side surface of the negative meniscus lens r3: radius of curvature of the object side surface of the biconvex lens d2: the negative meniscus lens and the both Air distance between convex lenses
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10680798A JP4147615B2 (en) | 1998-04-16 | 1998-04-16 | Wide converter lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10680798A JP4147615B2 (en) | 1998-04-16 | 1998-04-16 | Wide converter lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11305118A JPH11305118A (en) | 1999-11-05 |
| JP4147615B2 true JP4147615B2 (en) | 2008-09-10 |
Family
ID=14443134
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10680798A Expired - Lifetime JP4147615B2 (en) | 1998-04-16 | 1998-04-16 | Wide converter lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4147615B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010271502A (en) * | 2009-05-21 | 2010-12-02 | Nikon Corp | Converter lens and optical device having the same |
| JP2014056054A (en) * | 2012-09-11 | 2014-03-27 | Ricoh Co Ltd | Wide converter lens |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4674407B2 (en) | 2000-04-11 | 2011-04-20 | 株式会社ニコン | Wide converter lens |
| JP2003057028A (en) * | 2001-08-20 | 2003-02-26 | Sumitomo Osaka Cement Co Ltd | Distance sensor |
| KR100480223B1 (en) * | 2002-03-15 | 2005-03-30 | 최원석 | Super wide angle lens structure |
-
1998
- 1998-04-16 JP JP10680798A patent/JP4147615B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010271502A (en) * | 2009-05-21 | 2010-12-02 | Nikon Corp | Converter lens and optical device having the same |
| JP2014056054A (en) * | 2012-09-11 | 2014-03-27 | Ricoh Co Ltd | Wide converter lens |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11305118A (en) | 1999-11-05 |
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