JP3315419B2 - Achromatic lens system - Google Patents
Achromatic lens systemInfo
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- JP3315419B2 JP3315419B2 JP33253591A JP33253591A JP3315419B2 JP 3315419 B2 JP3315419 B2 JP 3315419B2 JP 33253591 A JP33253591 A JP 33253591A JP 33253591 A JP33253591 A JP 33253591A JP 3315419 B2 JP3315419 B2 JP 3315419B2
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- partial
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- lens system
- Prior art date
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Description
【０００１】[0001]
【産業上の利用分野】本発明は色消しレンズ系に関し、
特に３つの波長の光に対して良好なる色消し補正を行っ
た、即ち２次スペクトルを良好に補正した高い解像力が
得られる写真用カメラ、ビデオカメラそして事務器用等
の各種の撮影系に好適な色消しレンズ系に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an achromatic lens system.
In particular, it is suitable for various photographing systems, such as photographic cameras, video cameras, and office equipment, which perform good achromatic correction for light of three wavelengths, that is, obtain high resolution with good correction of the secondary spectrum. It relates to an achromatic lens system.
【０００２】[0002]
【従来の技術】撮影系の光学性能に影響を与える諸収差
の１つに色収差があり、従来より複数の波長の光に対す
る色収差を良好に補正した色消しレンズ系が種々と提案
されている。2. Description of the Related Art Chromatic aberration is one of various aberrations affecting the optical performance of a photographing system, and various achromatic lens systems have been proposed in which chromatic aberration for light of a plurality of wavelengths has been well corrected.
【０００３】このうち２つの波長の光に対する色収差は
分散の異なる通常の材料より成る複数のレンズを組み合
わせることにより、比較的容易に補正することができ
る。Of these, chromatic aberration with respect to light of two wavelengths can be corrected relatively easily by combining a plurality of lenses made of ordinary materials having different dispersions.
【０００４】しかしながら３つの波長の光に対する色収
差を良好に補正するようにした所謂アポクロマートのレ
ンズ系を得るには特殊の分散を有した材料より成る複数
のレンズを適切に組み合わせて構成する必要がある。However, in order to obtain a so-called apochromatic lens system in which chromatic aberrations for light of three wavelengths are satisfactorily corrected, it is necessary to appropriately combine a plurality of lenses made of a material having a special dispersion. .
【０００５】図５は従来公知の所謂ガウス型レンズのレ
ンズ断面図である。同図に示すガウス型レンズにおいて
異った波長の光に対する球面収差は、例えば図６に示す
ようになっている。同図に示すように第１と第２の波長
であるｅ線とＦ線の２つの波長の光に対する色収差は良
好に補正されているが、第３の波長であるＣ線に対して
は十分補正されていない。FIG. 5 is a sectional view of a conventionally known so-called Gaussian lens. FIG. 6 shows, for example, the spherical aberration of the Gaussian lens shown in FIG. As shown in the figure, the chromatic aberration with respect to the light of the two wavelengths, e-line and F-line, which are the first and second wavelengths, is well corrected, but is sufficiently corrected for the C-line, which is the third wavelength. Not corrected.
【０００６】[0006]
【発明が解決しようとする課題】最近の各分野における
撮影系はカラー化がすすみ、広い波長領域における光を
対象とする場合が多くなってきている。In recent years, photographing systems in various fields have progressed to colorization, and the use of light in a wide wavelength range has been increasing in many cases.
【０００７】一般に広い波長領域において色収差を良好
に補正し高い光学性能を得るには、各レンズの屈折力や
レンズ形状そして近軸屈折力配置等を適切に設定すると
共に、各レンズの材質を適切に設定することが重要にな
っている。In general, in order to satisfactorily correct chromatic aberration and obtain high optical performance in a wide wavelength range, the refractive power of each lens, the lens shape, the paraxial refractive power arrangement, and the like are appropriately set, and the material of each lens is appropriately adjusted. It is important to set.
【０００８】図５に示すガウス型レンズは色収差補正の
為に低分散ガラスを用いているが低分散ガラスは、一般
に屈折率が低い為に色収差を補正した場合、それに伴い
他の諸収差を良好に補正するのが大変難しくなってくる
という問題点があった。The Gaussian lens shown in FIG. 5 uses low-dispersion glass to correct chromatic aberration. However, low-dispersion glass generally has a low refractive index, so that when chromatic aberration is corrected, other various aberrations are improved accordingly. There is a problem that it becomes very difficult to correct the error.
【０００９】本発明は色収差、特に３つの波長の光の色
収差を良好に補正することができるように構成したレン
ズ群をレンズ系中の絞り近傍に配置することにより、色
収差の補正と共に他の諸収差も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が容易に得られる色
消しレンズ系の提供を目的とする。The present invention arranges a lens group configured so as to be able to satisfactorily correct chromatic aberration, particularly chromatic aberration of light of three wavelengths, in the vicinity of a stop in a lens system, thereby correcting chromatic aberration and other various factors. It is an object of the present invention to provide an achromatic lens system capable of favorably correcting aberrations and easily obtaining high optical performance over the entire screen.
【００１０】請求項１の発明の色消しレンズ系は、屈折
率ＮＰ、アッベ数νＰの材質１から成る正レンズＬＰと
屈折率ＮＮ、アッベ数νＮの材質２から成る負レンズＬ
Ｎの２つのレンズより成る焦点距離ｆ１のレンズ群Ｉが
レンズ系中の絞り近傍に配置されており、全系の焦点距
離をＦ、 該材質１のｇ線、Ｆ線の部分分散比と標準線の部分分数
比の差をΔＰ１(ｇ，Ｆ) 該材質１のＣ線、Ｓ線の部分分散比と標準線の部分分数
比の差をΔＰ１(Ｃ，Ｓ) 該材質２のｇ線、Ｆ線の部分分散比と標準線の部分分数
比の差をΔＰ２(ｇ，Ｆ) 該材質２のＣ線、Ｓ線の部分分散比と標準線の部分分数
比の差をΔＰ２(Ｃ，Ｓ) とするとき、The achromatic lens system according to the first aspect of the present invention comprises a positive lens LP made of a material 1 having a refractive index NP and an Abbe number νP and a negative lens L made of a material 2 having a refractive index NN and an Abbe number νN.
A lens group I having a focal length f1 including two lenses of N is disposed near the stop in the lens system, and the focal length of the entire system is denoted by F, the partial dispersion ratio of the g line and F line of the material 1 and the standard. The difference between the partial fractional ratio of the line is ΔP1 (g, F) The difference between the partial dispersion ratio of the C line and S line of the material 1 and the partial fractional ratio of the standard line is ΔP1 (C, S) The g line of the material 2, The difference between the partial dispersion ratio of the F line and the partial fraction of the standard line is ΔP2 (g, F) The difference between the partial dispersion ratio of the C line and S line of the material 2 and the partial fraction ratio of the standard line is ΔP2 (C, S )
【数２】 なる条件を満足することを特徴としている。(Equation 2) It is characterized by satisfying certain conditions.
【００１１】[0011]
【００１２】[0012]
【００１３】[0013]
【００１４】[0014]
【実施例】図１は本発明の色消しレンズ系の実施例１の
レンズ断面図である。実施例１は所謂ガウス型レンズに
本発明を適用した場合を示している。図２は図１の色消
しレンズ系Ｌの球面収差図である。図３は本発明の色消
しレンズ系の実施例２のレンズ断面図、図４は図３の色
消しレンズ系の球面収差図である。FIG. 1 is a sectional view of a first embodiment of an achromatic lens system according to the present invention. Embodiment 1 shows a case where the present invention is applied to a so-called Gaussian lens. FIG. 2 is a spherical aberration diagram of the achromatic lens system L of FIG. FIG. 3 is a lens sectional view of Embodiment 2 of the achromatic lens system of the present invention, and FIG. 4 is a spherical aberration diagram of the achromatic lens system of FIG.
【００１５】図中Ｌは色消しレンズ系で焦点距離はＦと
なっている。Ｉは本実施例の特徴とするレンズ群であ
り、絞りＳＰ近傍に配置されている。レンズ群Ｉは屈折
率ＮＰ、アッベ数νＰの材質１より成る正レンズＬＰ
と、屈折率ＮＮ、アッベ数νＮの材質２より成る負レン
ズＬＮの２つのレンズのダブレットより成り、合成の焦
点距離はｆ１となっている。In the figure, L denotes an achromatic lens system and the focal length is F. A lens group I is a feature of the present embodiment, and is disposed near the stop SP. The lens group I is a positive lens LP made of a material 1 having a refractive index NP and an Abbe number νP.
And a doublet of two lenses, a negative lens LN made of a material 2 having a refractive index NN and an Abbe number νN, and the combined focal length is f1.
【００１６】ＬＡはレンズ群Ｉよりも物体側に配置され
ている前方レンズ群、ＬＢはレンズ群Ｉよりも像面側に
配置されている後方レンズ群である。LA denotes a front lens group located closer to the object side than the lens group I, and LB denotes a rear lens group located closer to the image plane than the lens group I.
【００１７】本実施例では前述の正レンズＬＰと負レン
ズＬＮの２つのレンズより成るレンズ群Ｉを絞りＳＰ近
傍に配置すると共にレンズ群Ｉの焦点距離ｆ１と全レン
ズ系Ｌの焦点距離Ｆの比を条件式（１）の如く、又レン
ズ群Ｉを構成する２つのレンズＬＰ，ＬＮの材質のアッ
ベ数νＰ，νＮを条件式（２）の如く設定している。In this embodiment, the lens unit I including the above-mentioned two lenses, the positive lens LP and the negative lens LN, is arranged near the stop SP, and the focal length f1 of the lens unit I and the focal length F of the entire lens system L are determined. The ratio is set as in conditional expression (1), and the Abbe numbers νP and νN of the materials of the two lenses LP and LN constituting the lens unit I are set as in conditional expression (2).
【００１８】これにより図２や図４に示すようにｅ線、
Ｆ線、Ｃ線の３つの波長において色収差を良好に補正し
た高い光学性能を有した色消しレンズ系を得ている。As a result, as shown in FIG. 2 and FIG.
An achromatic lens system having high optical performance with excellent correction of chromatic aberration at three wavelengths of F-line and C-line has been obtained.
【００１９】特に本実施例においてはレンズ群Ｉの屈折
力を条件式（１）で示すようになるべく弱くなるように
し、絞りＳＰ近傍に配置し、これにより色収差を良好に
補正し、このとき他の諸収差への影響がなるべく少なく
なるようにしている。In particular, in this embodiment, the refracting power of the lens unit I is made as weak as possible as shown by the conditional expression (1), and the lens unit I is arranged near the stop SP, whereby chromatic aberration is corrected well. The effect on various aberrations is minimized.
【００２０】尚、本実施例においてレンズ群Ｉにおける
正レンズＬＰと負レンズＬＮの配置順は任意で良く、又
同図では接合レンズより構成しているが独立に構成して
も良い。又、本実施例においてレンズ群Ｉを絞りＳＰ近
傍に配置するということはレンズ群Ｉと絞りＳＰとの間
に他のレンズ群が存在しないで絞りＳＰの直前又は直後
という意味である。In this embodiment, the arrangement order of the positive lens LP and the negative lens LN in the lens unit I may be arbitrary, and in FIG. In this embodiment, disposing the lens unit I near the stop SP means immediately before or immediately after the stop SP without any other lens group between the lens group I and the stop SP.
【００２１】次に前述の各条件式の技術的意味について
説明する。Next, the technical meaning of each of the above conditional expressions will be described.
【００２２】条件式（１）はレンズ群Ｉの屈折力と全系
に対する屈折力との比に関し、レンズ群Ｉの屈折力をな
るべく小さくし、色収差の補正を良好に行いつつ他の諸
収差の影響がなるべくないようにする為のものである。
条件式（１）を外れると色収差の補正は容易となるがコ
マ収差や非点収差等の他の諸収差の発生量が多くなり、
これをバランス良く補正するのが難しくなってくる。Conditional expression (1) relates to the ratio of the refractive power of the lens unit I to the refractive power of the entire system. The refractive power of the lens unit I is made as small as possible, and chromatic aberration is corrected well while other aberrations are corrected. This is to minimize the effect.
Deviating from conditional expression (1) makes it easy to correct chromatic aberration, but increases the amount of other aberrations such as coma and astigmatism,
It becomes difficult to correct this in a well-balanced manner.
【００２３】条件式（２）はレンズ群Ｉの正レンズＬＰ
と負レンズＬＮの２つのレンズの材質のアッベ数を適切
に設定することによりレンズ群Ｉを絞り近傍に配置した
ときの色収差、特に３つの波長の光に対する色収差を良
好に補正する為のものであり、条件式（２）を外れると
３つの波長の光の色収差を良好に補正するのが難しくな
ってくる。Conditional expression (2) is for the positive lens LP of the lens unit I.
By appropriately setting the Abbe numbers of the materials of the two lenses of the negative lens LN and the negative lens LN, the chromatic aberration when the lens group I is arranged near the stop, particularly the chromatic aberration for light of three wavelengths, is favorably corrected. If conditional expression (2) is not satisfied, it becomes difficult to satisfactorily correct the chromatic aberration of light of three wavelengths.
【００２４】条件式（３）は条件式（２）のもとでレン
ズ群Ｉの正レンズＬＰと負レンズＬＮの材質の部分分散
比の標準線からの偏差を適切に設定し、色収差を更に良
好に補正する為のものであり、この条件を外れると３つ
の波長の光に対する色収差を良好に補正するのが難しく
なってくる。Conditional expression (3) appropriately sets the deviation of the partial dispersion ratio of the material of the positive lens LP and negative lens LN of the lens unit I from the standard line under the conditional expression (2), and further reduces chromatic aberration. This is for good correction, and if this condition is not met, it becomes difficult to satisfactorily correct chromatic aberration for light of three wavelengths.
【００２５】次に本発明の色消しレンズ系における色消
しに関する部分分散比について説明する。Next, the partial dispersion ratio relating to achromatism in the achromatic lens system of the present invention will be described.
【００２６】光学材料（材質）の波長ｘと波長ｙに対す
る部分分散比Ｐ（ｘ，ｙ）は順に波長ｘ，ｙ、Ｆ線、Ｃ
線における屈折率をｎx ，ｎy，ｎF ，ｎc としたときThe partial dispersion ratio P (x, y) of the optical material (material) with respect to the wavelengths x and y is represented by the wavelengths x, y, F-line, C
When the refractive index in the line n x, n y, n F , and n c
【００２７】[0027]
【数５】 で求められる。一般の光学材料の多くは近似法によりａ
XY，ｂXYを定数、分散をνとしたとき Ｐ（ｘ，ｙ）≒ａXY＋ｂXY・ν＝Ｐｐ（ｘ，ｙ） ‥‥‥（ｂ） の１次式が成立する。(Equation 5) Is required. Many common optical materials are a
When XY and b XY are constants and variance is ν, the following linear equation holds: P (x, y) ≒ a XY + b XY · ν = Pp (x, y) ‥‥‥ (b)
【００２８】そこで今、標準ガラスとして商品名Ｋ７と
Ｆ２（いずれもショット社、西独）を選び、それを標準
線の部分分散比Ｐｐ0 （ｘ，ｙ）とする。Therefore, trade names K7 and F2 (both Shot Company and West Germany) are now selected as standard glass, and are set as the partial dispersion ratio Pp 0 (x, y) of the standard line.
【００２９】光学材料の部分分散比Ｐ（ｘ，ｙ）と標準
線の部分分散比Ｐ PO （ｘ，ｙ）との差をΔＰ（ｘ，ｙ）
とすると ΔＰ（ｘ，ｙ）＝Ｐ（ｘ，ｙ）−Ｐ PO （ｘ，ｙ） ‥‥（ｃ） となる。ここでΔＰ（ｘ，ｙ）は分散特性の標準ガラス
との差を量的に表わすものである。ここではｇ線、Ｆ線
の部分分散比Ｐ（ｇ，Ｆ）とＣ線、Ｓ線の部分分散比Ｐ
（Ｃ，Ｓ）を用いるとThe difference between the partial dispersion ratio P (x, y) of the optical material and the partial dispersion ratio P PO (x, y) of the standard line is represented by ΔP (x, y).
Then, ΔP (x, y) = P (x, y) −P PO (x, y) ‥‥ (c). Here, ΔP (x, y) quantitatively represents the difference between the dispersion characteristics and the standard glass. Here, the partial dispersion ratio P (g, F) of the g line and the F line and the partial dispersion ratio P of the C line and the S line
Using (C, S)
【００３０】[0030]
【数３】 となる。たとえば材質１、２の波長ｘと波長ｙに対する
部分分散比Ｐ（ｘ,ｙ）と標準線の部分分数比Ｐ PO （ｘ,
ｙ）との差ΔＰ１（ｘ，ｙ）、ΔＰ２（ｘ，ｙ）に対し
てｇ線、Ｆ線の部分分散比と標準線の部分分数比との差
は、ΔＰ１（ｇ，Ｆ）、ΔＰ２（ｇ，Ｆ）、Ｃ線、Ｓ線
の部分分散比と標準線の部分分数比との差は、ΔＰ１
（Ｃ，Ｓ）、ΔＰ２（Ｃ，Ｓ）で表される。尚、ここで
標準線の部分分数比Ｐ PO （ｇ,Ｆ）、Ｐ PO （Ｃ,Ｓ）とし
ては、(Equation 3) Becomes For example, the partial dispersion ratio P (x, y) of the materials 1 and 2 with respect to the wavelength x and the wavelength y and the partial fraction ratio P PO (x,
y) and the difference ΔP1 (x, y) and ΔP2 (x, y) between the partial dispersion ratio of the g-line and F-line and the partial fraction ratio of the standard line
Is ΔP1 (g, F), ΔP2 (g, F), the difference between the partial dispersion ratio of the C line and the S line and the partial fraction ratio of the standard line is ΔP1
(C, S) and ΔP2 (C, S). Here, the partial fraction ratios P PO (g, F) and P PO (C, S) of the standard line are as follows:
【００３１】[0031]
【数４】 但し(Equation 4) However
【００３２】[0032]
【数８】 なる式を用いている。前述の部分分散比はこれらの式で
定義される値を用いて表わしている。(Equation 8) Is used. The above-mentioned partial dispersion ratio is represented using the values defined by these equations.
【００３３】次に本発明の実施例１，２の数値実施例を
示す。数値実施例においてＲｉは物体側より順に第ｉ番
目のレンズ面の曲率半径、Ｄｉは物体側より第ｉ番目の
レンズ厚及び空気間隔、Ｎｉとνｉは各々物体側より順
に第ｉ番目のレンズのガラスの屈折率とアッベ数であ
る。 実施例１ レンズ群Ｉ：f1 = -487 正レンズＬＰ；ΔP1(g,F)= 0.0304 ΔP1(C,S)=-0.0099 負レンズＬＮ；ΔP2(g,F)= 0.0025 ΔP2(C,S)=-0.0008Next, numerical examples of the first and second embodiments of the present invention will be described. In the numerical examples, Ri is the radius of curvature of the i-th lens surface in order from the object side, Di is the i-th lens thickness and air spacing from the object side, and Ni and νi are the i-th lens surfaces in order from the object side. The refractive index and Abbe number of glass. Example 1 Lens group I: f1 = −487 positive lens LP; ΔP 1 (g, F) = 0.0304 ΔP 1 (C, S) = − 0.0099 negative lens LN; ΔP 2 (g, F) = 0.0025 ΔP 2 (C, S ) =-0.0008
【００３４】[0034]
【数９】 実施例２ F= 100 FNo=5.2 2ω=42° 撮影倍率β=-0.11 レンズ群Ｉ 正レンズＬＰ；ΔP1(g,F)= 0.0304 ΔP1(C,S)=-0.0099 負レンズＬＮ；ΔP2(g,F)= 0.0025 ΔP2(C,S)=-0.0008(Equation 9) Example 2 F = 100 FNo = 5.2 2ω = 42 ° Magnification β = -0.11 Lens group I Positive lens LP; ΔP 1 (g, F) = 0.0304 ΔP 1 (C, S) =-0.0099 Negative lens LN; ΔP 2 (g, F) = 0.0025 ΔP 2 (C, S) =-0.0008
【００３５】[0035]
【数１０】 (Equation 10)
【００３６】[0036]
【発明の効果】本発明によれば所定の材質より成る正レ
ンズと負レンズの２つのレンズより成るレンズ群をレン
ズ系中の絞り近傍に配置することにより、３つの波長の
光の色収差を他の諸収差への影響を殆どなくして良好に
補正することができる高い光学性能を有した色消しレン
ズ系を達成することができる。According to the present invention, the chromatic aberration of light of three wavelengths can be reduced by arranging a lens group consisting of two lenses, a positive lens and a negative lens, made of a predetermined material near the stop in the lens system. Thus, it is possible to achieve an achromatic lens system having high optical performance which can be corrected satisfactorily with almost no influence on various aberrations.
【００３７】特に本発明では２つの波長の光において色
補正したレンズ群を基礎として１次の色分散を殆ど発生
させずに２次の色分散を発生し、レンズ系全体の２次の
色分散を相殺する小さな屈折力を有するように構成した
レンズ群Ｉを絞り近傍に配置することにより、３つの波
長の光に対する色収差を良好に補正した色消しレンズ系
を達成している。In particular, in the present invention, secondary chromatic dispersion is generated without generating primary chromatic dispersion almost on the basis of a lens group color-corrected with light of two wavelengths, and secondary chromatic dispersion of the entire lens system is performed. By disposing the lens group I configured to have a small refracting power to cancel the chromatic aberration in the vicinity of the stop, an achromatic lens system in which chromatic aberration with respect to light of three wavelengths is satisfactorily corrected is achieved.
【図１】 本発明の実施例１のレンズ断面図FIG. 1 is a sectional view of a lens according to a first embodiment of the present invention.
【図２】 図１の色消しレンズの球面収差図FIG. 2 is a spherical aberration diagram of the achromatic lens of FIG. 1;
【図３】 本発明の実施例２のレンズ断面図FIG. 3 is a sectional view of a lens according to a second embodiment of the present invention.
【図４】 図３の色消しレンズの球面収差図FIG. 4 is a diagram showing spherical aberration of the achromatic lens shown in FIG. 3;
【図５】 従来のガウス型レンズのレンズ断面図FIG. 5 is a sectional view of a conventional Gaussian lens.
【図６】 図５ガウス型レンズの球面収差図FIG. 6 is a diagram showing spherical aberration of a Gaussian lens.
Ｌ 色消しレンズ系 ＬＡ 前方レンズ群 ＬＢ 後方レンズ群 Ｉ レンズ群 ＬＮ 負レンズ ＬＰ 正レンズ ＳＰ 絞り L Achromatic lens system LA Front lens group LB Rear lens group I Lens group LN Negative lens LP Positive lens SP Aperture
フロントページの続き (56)参考文献 特開 昭60−100115（ＪＰ，Ａ) 特開 平３−96912（ＪＰ，Ａ) 特開 昭63−247713（ＪＰ，Ａ) 特開 昭63−226611（ＪＰ，Ａ) 特開 平２−216115（ＪＰ，Ａ) 特開 平１−279218（ＪＰ，Ａ) 特開 平３−288112（ＪＰ，Ａ) 特開 平５−66346（ＪＰ，Ａ) 特開 平４−78804（ＪＰ，Ａ) 特開 平４−311912（ＪＰ，Ａ) 特開 昭62−235914（ＪＰ，Ａ) 特公 昭28−6685（ＪＰ，Ｂ１) (58)調査した分野(Int.Cl.7，ＤＢ名) G02B 9/00 - 17/08 G02B 21/02 - 21/04 G02B 25/00 - 25/04 Continuation of the front page (56) References JP-A-60-100115 (JP, A) JP-A-3-96912 (JP, A) JP-A-63-247713 (JP, A) JP-A-63-226611 (JP) JP-A-2-216115 (JP, A) JP-A-1-279218 (JP, A) JP-A-3-288112 (JP, A) JP-A-5-66346 (JP, A) 4-78804 (JP, A) JP-A-4-31912 (JP, A) JP-A-62-235914 (JP, A) JP-B-28-6865 (JP, B1) (58) Fields investigated (Int. Cl 7, DB name) G02B 9/00 -. 17/08 G02B 21/02 - 21/04 G02B 25/00 - 25/04
Claims (1)
成る正レンズＬＰと屈折率ＮＮ、アッベ数νＮの材質２
から成る負レンズＬＮの２つのレンズより成る焦点距離
ｆ１のレンズ群Ｉがレンズ系中の絞り近傍に配置されて
おり、全系の焦点距離をＦ、 該材質１のｇ線、Ｆ線の部分分散比と標準線の部分分数
比の差をΔＰ１(ｇ，Ｆ) 該材質１のＣ線、Ｓ線の部分分散比と標準線の部分分数
比の差をΔＰ１(Ｃ，Ｓ) 該材質２のｇ線、Ｆ線の部分分散比と標準線の部分分数
比の差をΔＰ２(ｇ，Ｆ) 該材質２のＣ線、Ｓ線の部分分散比と標準線の部分分数
比の差をΔＰ２(Ｃ，Ｓ)とするとき、 【数１】 なる条件を満足することを特徴とする色消しレンズ系。1. A positive lens LP made of a material 1 having a refractive index NP and an Abbe number νP, and a material 2 having a refractive index NN and an Abbe number νN.
A lens group I having a focal length f1 including two lenses of a negative lens LN is disposed near the stop in the lens system, and the focal length of the entire system is denoted by F; Dispersion ratio and fraction of standard line
The difference between the ratios is ΔP1 (g, F) The partial dispersion ratio of the C line and S line of the material 1 and the partial fraction of the standard line
The difference in ratio is ΔP1 (C, S) The partial dispersion ratio of g line and F line of the material 2 and the partial fraction of the standard line
The difference in specific ΔP2 (g, F) C line of said material quality 2, partial fraction of the partial dispersion ratio and the standard line S line
When the ratio difference is ΔP2 (C, S), An achromatic lens system that satisfies certain conditions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33253591A JP3315419B2 (en) | 1991-11-20 | 1991-11-20 | Achromatic lens system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33253591A JP3315419B2 (en) | 1991-11-20 | 1991-11-20 | Achromatic lens system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05142468A JPH05142468A (en) | 1993-06-11 |
| JP3315419B2 true JP3315419B2 (en) | 2002-08-19 |
Family
ID=18256008
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33253591A Expired - Fee Related JP3315419B2 (en) | 1991-11-20 | 1991-11-20 | Achromatic lens system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3315419B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104570309A (en) * | 2014-12-31 | 2015-04-29 | 广西师范大学 | Long-work-distance flat-field apochromatic metallographic microscope objective with magnification power being 10 and without CaF2 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5568325A (en) * | 1993-08-25 | 1996-10-22 | Asahi Kogaku Kogyo Kabushiki Kaisha | Achromatic lens system |
| JPH10339843A (en) * | 1997-06-05 | 1998-12-22 | Asahi Optical Co Ltd | Achromatic reading lens system |
-
1991
- 1991-11-20 JP JP33253591A patent/JP3315419B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104570309A (en) * | 2014-12-31 | 2015-04-29 | 广西师范大学 | Long-work-distance flat-field apochromatic metallographic microscope objective with magnification power being 10 and without CaF2 |
| CN104570309B (en) * | 2014-12-31 | 2018-02-02 | 广西师范大学 | One kind is without CaF210 × long working distance excluding plan apochromatic metallographic microobjective |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05142468A (en) | 1993-06-11 |
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