JP2551933B2 - Lens system - Google Patents
Lens systemInfo
- Publication number
- JP2551933B2 JP2551933B2 JP61026609A JP2660986A JP2551933B2 JP 2551933 B2 JP2551933 B2 JP 2551933B2 JP 61026609 A JP61026609 A JP 61026609A JP 2660986 A JP2660986 A JP 2660986A JP 2551933 B2 JP2551933 B2 JP 2551933B2
- Authority
- JP
- Japan
- Prior art keywords
- lens
- spherical aberration
- group
- aspherical
- rear group
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
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- Lenses (AREA)
Description
【発明の詳細な説明】 本発明は、レンズシャッター式カメラ用レンズに関す
る。The present invention relates to a lens for a lens shutter type camera.
従来、画角2w＝65゜程度のレンズシャッター式カメラ
用レンズとしては、正の前群と負の後群からなるいわゆ
るテレフォトタイプが周知であるが、この種のレンズの
ほとんどがF2.8程度又はそれより暗いものであり、大口
径のものはあまりみられない。テレフォトタイプにおい
て大口径広角を実現するためには球面収差と歪曲収差の
補正が難しく、特に球面収差に関しては大口径化による
球面収差の悪化に加えて、さらに、前群を繰り出してフ
ォーカシングした場合には、球面収差が変動するという
問題も生じる。Conventionally, a so-called telephoto type consisting of a positive front group and a negative rear group is well known as a lens shutter type camera lens with an angle of view of 2w = 65 °, but most of this type of lens is F2.8. It is moderate or darker, and the ones with a large diameter are rare. In the telephoto type, it is difficult to correct spherical aberration and distortion in order to achieve a large aperture and wide angle. Especially, regarding the spherical aberration, in addition to the deterioration of the spherical aberration due to the increase in aperture, when the front lens group is further extended and focused In addition, there is a problem that spherical aberration varies.
本発明はこれらの問題点を解決するために為されたも
のであり、球面収差、歪曲収差が良好に補正された、コ
ンパクトな、画角2w＝65゜、F1.9程度の大口径化に適し
たレンズ系を提供することを目的とする。The present invention has been made to solve these problems, and has a compact, wide angle of view of 2w = 65 ° and F1.9, in which spherical aberration and distortion are well corrected. An object is to provide a suitable lens system.
以下本発明について、さらに詳細に説明する。 The present invention will be described in more detail below.
本発明に係わるシャッター式カメラ用レンズは第1,3,
5,7,9.11,13,15,17,19,21図から明らかなように、少な
くとも３群から構成され、全体として正の屈折力を持つ
前群（Ｆ）と負の屈折力を有する後群（Ｒ）とからな
る。後群（Ｒ）は少なくとも２群からなり、その最も物
体側のレンズは少なくとも一方の面に非球面を有する非
球面レンズであり、さらに以下の条件を満足することを
特徴とする。The shutter type camera lens according to the present invention is the first, third,
As is clear from the figures 5,7,9.11,13,15,17,19,21, it consists of at least 3 groups, the front group (F) having a positive refracting power as a whole and the rear group having a negative refracting power. And group (R). The rear group (R) is composed of at least two groups, and the lens closest to the object side is an aspherical lens having an aspherical surface on at least one surface, and further satisfies the following conditions.
（１） 1.2f＜（I+）max＜3.5f （２） 0.1＜ＩASP／ΣI-＜0.5 但し、 （I+）max:各面の三次球面収差係数で正の値をもつもの
のうちの最大値 ΣI-:負の値を持つ三次球面収差係数の総和 ＩASP：後群中最も物体側にあるレンズの非球面収差係
数のうち、非球面によって定まる成分 である。 (1) 1.2f <(I + ) max <3.5f (2) 0.1 <I ASP / ΣI - <0.5 where, (I +) max: in tertiary spherical aberration coefficient of each surface of those having a positive value maximum .SIGMA.I -: negative total tertiary spherical aberration coefficient having a value IASP: of aspherical aberration coefficients of the lens on the most object side in the rear lens group, which is a component determined by the aspherical surface.
条件（１）は、比較的構成枚数が少ない大口径のレン
ズ系で系を小型に保ちながら球面収差を良好に保つため
の条件である。条件（１）の上限を越えた正の三次球面
収差係数を持つ面があると球面収差の補正が困難とな
る。一方正の最大三次球面収差係数を下限以下に制限す
ると強い収れん力を持つ面がなくなり全長が長くなって
しまいレンズ系をコンパクトに保つことができない。The condition (1) is a condition for maintaining good spherical aberration while keeping the system small in a large-diameter lens system having a relatively small number of constituent elements. If there is a surface having a positive third-order spherical aberration coefficient that exceeds the upper limit of the condition (1), it becomes difficult to correct spherical aberration. On the other hand, if the maximum positive third-order spherical aberration coefficient is limited to the lower limit or less, there is no surface having strong converging power and the total length becomes long, so that the lens system cannot be kept compact.
条件（２）は、サジタルフレア、歪曲収差が大きくな
りずぎないように保ちながら球面収差の補正を行うため
の条件である。条件（２）の値が上限を越えた領域で球
面収差を補正すると前群中の負の屈折力が弱くなり歪曲
収差が正の大きな値をとる。また下限を越えた領域で球
面収差を補正すると、前群中の負の屈折力が強くなりサ
ジタルフレアが増大する。The condition (2) is a condition for correcting the spherical aberration while keeping the sagittal flare and the distortion inevitably increasing. If the spherical aberration is corrected in the region where the value of the condition (2) exceeds the upper limit, the negative refractive power in the front group becomes weak and the distortion takes a large positive value. If spherical aberration is corrected in a region below the lower limit, the negative refracting power in the front group will become stronger and sagittal flare will increase.
また、本発明においては球面収差補正用の非球面を後
群のレンズにそれも、軸上光線がより高い位置を通る後
群の最も物体側のレンズに設けることによって、前群の
みを繰り出してフォーカシングした場合でも球面収差の
変動が少なくなようにしている。Further, in the present invention, the aspherical surface for correcting spherical aberration is provided in the lens of the rear group, and also in the lens on the most object side of the rear group where the axial ray passes through a higher position, so that only the front group is extended. Even when focusing is performed, fluctuations in spherical aberration are reduced.
さらに本発明では、前記前群（Ｆ）を正レンズ群
（L1）、負レンズ群（L2）、正レンズ群（L3）の３群と
するとともに、次の条件を満足するように構成するのが
望ましい。Furthermore, in the present invention, the front lens group (F) is composed of three lens groups, a positive lens group (L 1 ), a negative lens group (L 2 ), and a positive lens group (L 3 ), and the following conditions are satisfied. It is desirable to configure.
（３） −0.12＜ASP/＜0.50 （４） 0.5＜3/４＜３ （５） ｎASP＜1.62 但し、ここで、ASP :後群中最も物体側にある非球面レンズの屈折力 ：全系の屈折力3 :前群負レンズ群の最も物体側の面の屈折力4 :前群負レンズ群の最も像側の面の屈折力 ｎASP：後群中最も物体側にある非球面レンズの屈折率 である。 (3) -0.12 <ASP /<0.50 ( 4) 0.5 <3/4 <3 (5) n ASP <1.62 However, where, ASP: refractive power of the aspherical lens on the most object side in the rear group: All Refractive power of the system 3 : Refractive power of the most object side surface of the front group negative lens group 4 : Refractive power of the most image side surface of the front group negative lens group n ASP : Aspherical lens closest to the object side in the rear group Is the refractive index of.
条件（３）は後群中最も物体側にある非球面レンズの
屈折力に関するものであり、輪帯球面収差を補正し、周
辺光量の確保をし、レンズ全長を小さく保つための条件
である。上限を越えると、輪帯球面収差が著しくなり、
絞り込んだ際の像点移動が大きくなりかつテレフォトタ
イプの屈折力配置が崩れ全長が長くなる。下限を越える
と、画面周辺部の光量を確保することが困難となる。The condition (3) relates to the refractive power of the aspherical lens closest to the object side in the rear group, and is a condition for correcting the spherical aberration of the annular zone, securing the peripheral light amount, and keeping the total lens length small. If the upper limit is exceeded, ring spherical aberration becomes significant,
When the aperture is narrowed down, the image point movement becomes large and the telephoto type refracting power arrangement collapses, resulting in a longer overall length. When the value goes below the lower limit, it becomes difficult to secure the amount of light in the peripheral portion of the screen.
条件（４）は、前群負レンズ群（L2）の最も物体側の
面（r3）の屈折力と、最も像側の面（r4）の屈折力の比
を規定するものであり、歪曲収差の補正に関する条件で
ある。上限を越えると、画面の中帯から周辺にかけて、
歪曲収差が急激に負の方向に偏移し、いわゆる逆陣笠状
の歪曲収差が目立つ。下限を越えると、正の歪曲収差が
著しくなる。The condition (4) defines the ratio of the refractive power of the most object side surface (r 3 ) of the front lens group (L 2 ) to the most image side surface (r 4 ). , Conditions relating to correction of distortion. If you exceed the upper limit, from the middle of the screen to the periphery,
The distortion abruptly shifts to the negative direction, and the so-called inverse-combined distortion is conspicuous. When the value goes below the lower limit, the positive distortion becomes significant.
条件（５）は、後群中最も物体側にある非球面レンズ
の屈折率を規定するものであり、非球面の形状誤差によ
る性能劣化を小さくし、非球面の加工性を良くするため
の条件である。この条件を満足しないと、わずかな形状
の誤差が結像性能に大きな影響を与えるようになる。The condition (5) defines the refractive index of the aspherical lens closest to the object side in the rear group, and is a condition for reducing performance deterioration due to a shape error of the aspherical surface and improving workability of the aspherical surface. Is. If this condition is not satisfied, even a slight shape error will have a great influence on the imaging performance.
さらに条件（１）（４）については、さらに望ましく
は、 （１） 1.2f＜（I+）max＜3.0f （４） 0.7＜3/（４＜３ とすると、よりよく収差が補正されうる。Regarding conditions (1) and (4), it is more desirable that (1) 1.2f <(I + ) max <3.0f (4) 0.7 < 3 / ( 4 <3 be set so that the aberration can be corrected better. .
本実施例中では、前群は単レンズ群からなるが、複数
レンズを接合したレンズ群から構成してもよい。In the present embodiment, the front group is composed of a single lens group, but it may be composed of a lens group in which a plurality of lenses are cemented.
以上の条件を満足することにより画角2w＝65゜F1.9程
度の大口径かつ広角で球面収差歪曲収差がよく補正され
たコンパクトなテレフォトタイプのレンズシャッターカ
メラ用レンズを提供することが可能である。By satisfying the above conditions, it is possible to provide a compact telephoto type lens shutter camera lens with a wide angle of view of about 2w = 65 ° F1.9 and a wide angle with well-corrected spherical aberration and distortion. Is.
以下、本発明の実施例を示す。実施例中L1,L2,L3…は
物体側から数えたレンズ、r1,r2,r3…は物体側から数え
た面の曲率半径、d1,d2,d3…は物体側から数えた軸上面
間隔を示す。F,Rはそれぞれ前群後群を示す。＊印及び
＊＊を付した面は、非球面で構成された面であることを
示し、その形状は、光軸方向にＸ座標、それと垂直な方
向にＹ座標をとり、基準球面の曲率半径を▲▼とす
ると、 で示される。ここで、a,b,c,d,…は、非球面係数であ
り、この非球面の近軸曲率半径riは、 によって表わされる。Examples of the present invention will be shown below. In the examples, L 1 , L 2 , L 3 ... Are lenses counted from the object side, r 1 , r 2 , r 3 ... Are radii of curvature of the surfaces counted from the object side, and d 1 , d 2 , d 3 ... Shows the axial distance from the object side. F and R represent the front group and the rear group, respectively. The surface marked with * and ** indicates that it is an aspherical surface, and its shape has the X coordinate in the optical axis direction and the Y coordinate in the direction perpendicular to it, and the radius of curvature of the reference spherical surface. Is ▲ ▼, Indicated by. Where a, b, c, d, ... are aspherical coefficients, and the paraxial radius of curvature ri of this aspherical surface is Represented by
第1,3,5,7,9,11,13,15,17,19,21図はそれぞれ第１実
施例及至第11実施例のレンズ構成図である。第2,4,6,8,
10,12,14,16,18,20,22図はそれぞれ上記実施例の収差図
である。FIGS. 1, 3, 5, 7, 7, 9, 11, 13, 15, 15, 17, 19, and 21 are lens configuration diagrams of the first to eleventh examples, respectively. 2nd, 4th, 6th, 8th,
FIGS. 10, 12, 14, 16, 18, 20, and 22 are aberration diagrams of the above-described examples, respectively.
第1,3,5,7,9,11,13,15,17,19,21図はそれぞれ第１実施
例及至第11実施例のレンズ構成図である。第2,4,6,8,1
0,12,14,16,18,20,22図はそれぞれ第１実施例及至第11
実施例の収差図である。 Ｆ……前群 Ｒ……後群FIGS. 1, 3, 5, 7, 7, 9, 11, 13, 15, 15, 17, 19, and 21 are lens configuration diagrams of the first to eleventh examples, respectively. 2nd, 4th, 6th, 8th, 1st
0,12,14,16,18,20,22 FIGS. 1 to 11 show
It is an aberration diagram of an example. F: front group R: rear group
Claims (1)
有する前群と、２枚若しくは３枚から構成され全体とし
て負の屈折力を持つ後群とからなり、 前記後群の最も物体側のレンズは少なくとも一方の面が
非球面であり、 以下の条件式を満足することを特徴とするレンズ系； 1.2f＜（I+）max＜3.5f 0.1＜IASP/ΣI-＜0.5 但し、 f:全系の焦点距離、 （I+）max:各面の三次球面収差係数で正の値を持つのも
ののうちの最大値、 ΣI-:負の値を持つ三次球面収差係数の総和、 IASP:後群中最も物体側にあるレンズの非球面の三次球
面収差係数のうち非球面によって定まる成分、 である。1. A front group composed of three sheets and having a positive refracting power as a whole, and a rear group composed of two or three sheets and having a negative refracting power as a whole, wherein the rear group is the most object. side of the lens is at least one surface aspherical, lens system and satisfies the following condition; 1.2f <(I +) max <3.5f 0.1 <I ASP / ΣI - <0.5 where , f: focal length of the entire system, (I +) max: maximum value among those in the third-order spherical aberration coefficients of each surface has a positive value, .SIGMA.I -: the sum of the third order spherical aberration coefficient having a negative value, I ASP : A component of the third-order spherical aberration coefficient of the aspherical surface of the lens closest to the object in the rear group, which is determined by the aspherical surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61026609A JP2551933B2 (en) | 1986-02-07 | 1986-02-07 | Lens system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61026609A JP2551933B2 (en) | 1986-02-07 | 1986-02-07 | Lens system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62183419A JPS62183419A (en) | 1987-08-11 |
| JP2551933B2 true JP2551933B2 (en) | 1996-11-06 |
Family
ID=12198240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61026609A Expired - Lifetime JP2551933B2 (en) | 1986-02-07 | 1986-02-07 | Lens system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2551933B2 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5428240B2 (en) * | 2008-08-21 | 2014-02-26 | コニカミノルタ株式会社 | Imaging lens |
| JP2012189893A (en) * | 2011-03-11 | 2012-10-04 | Olympus Corp | Imaging optical system and imaging apparatus using the same |
| US8976466B2 (en) | 2011-03-11 | 2015-03-10 | Olympus Corporation | Imaging optical system and imaging apparatus using the same |
| JP5896684B2 (en) * | 2011-10-21 | 2016-03-30 | キヤノン株式会社 | Optical system and imaging apparatus having the same |
| JP6011921B2 (en) * | 2012-09-18 | 2016-10-25 | 株式会社リコー | Imaging lens, imaging device, and information device |
| TWI448725B (en) | 2012-10-22 | 2014-08-11 | Largan Precision Co Ltd | Image capturing optical lens system |
| KR101452084B1 (en) | 2013-01-22 | 2014-10-16 | 삼성전기주식회사 | Subminiature optical system and portable device having the same |
| JP2014203057A (en) * | 2013-04-10 | 2014-10-27 | 株式会社ビクセン | Telephoto objective lens |
| TWI547713B (en) | 2014-07-30 | 2016-09-01 | 大立光電股份有限公司 | Imaging optical system, image capturing device, and electronic device |
| TWI565966B (en) | 2015-07-24 | 2017-01-11 | 大立光電股份有限公司 | Optical photographing lens assembly, image capturing device and electronic device |
| TWI585455B (en) | 2015-10-20 | 2017-06-01 | 大立光電股份有限公司 | Image capturing lens system, image capturing apparatus and electronic device |
| CN111679413B (en) * | 2020-08-12 | 2020-10-30 | 瑞声通讯科技(常州)有限公司 | Image pickup optical lens |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5944016A (en) * | 1982-09-06 | 1984-03-12 | Minolta Camera Co Ltd | Lens system with aspherical surface |
| JPS59229516A (en) * | 1983-06-13 | 1984-12-24 | Konishiroku Photo Ind Co Ltd | Wide-angle lens |
-
1986
- 1986-02-07 JP JP61026609A patent/JP2551933B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62183419A (en) | 1987-08-11 |
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