JP2001100092A - Photographic optical system - Google Patents
Photographic optical systemInfo
- Publication number
- JP2001100092A JP2001100092A JP28045699A JP28045699A JP2001100092A JP 2001100092 A JP2001100092 A JP 2001100092A JP 28045699 A JP28045699 A JP 28045699A JP 28045699 A JP28045699 A JP 28045699A JP 2001100092 A JP2001100092 A JP 2001100092A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- group
- optical system
- image
- biconvex lens
- 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.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、小型ＣＣＤカメラ
の撮影光学系であって、特に、小型ＣＣＤカメラ、デジ
タルカメラ、ビデオカメラに用いる撮影光学系、ひいて
は銀塩カメラにも適用できる広角タイプの撮影光学系に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographic optical system for a small CCD camera, and more particularly to a wide-angle type photographic optical system used for a small CCD camera, a digital camera, and a video camera, and further, a silver halide camera. It relates to a photographing optical system.
【０００２】[0002]
【従来の技術】近年、ＣＣＤの製造技術の進歩にともな
い、高精細で、しかも画面サイズの小さなＣＣＤが開発
され、既に１００万画素を越える高密度のＣＣＤが小型
ＣＣＤカメラ、デジタルカメラおよびビデオカメラ等に
用いられることが一般化してきている。このように画面
サイズが小さく且つ画素密度の高いＣＣＤに対して、撮
影光学系から撮影光を入射する際、ＣＣＤの微細な受光
部分が入射してくる光束を蹴ってしまう恐れがあること
から、斜め方向からの入射をできるだけ避け、平行光束
に近い状態で撮影光をＣＣＤに入射させることが要求さ
れる。斯かる要求に対応する撮影光学系としては、従
来、特開平９−１８９８５６号公報が知られている。特
開平９−１８９８５６号公報に示された撮影光学系は、
Ｆナンバーが２．８程度、短焦点距離で２５°以上の半
画角に対して収差の発生を良好に抑える性質を有し、し
かもバックフォーカスが長い撮影レンズであるところか
ら、ＣＣＤに対して平行光束に近似した状態で光を入射
させることが達成できる。しかしながら、このようにバ
ックフォーカスを長くすると、どうしても撮影レンズの
全系が長くなることが避けられず、コンパクトな撮影光
学系が得られないという問題がある。2. Description of the Related Art In recent years, with the progress of CCD manufacturing technology, high-definition CCDs having a small screen size have been developed, and high-density CCDs exceeding one million pixels have already been used in small CCD cameras, digital cameras and video cameras. It has been generalized to be used for such purposes. As described above, when shooting light is input from a shooting optical system to a CCD having a small screen size and a high pixel density, a minute light receiving portion of the CCD may kick out the incoming light flux. It is required that incident light from a diagonal direction be avoided as much as possible, and that the photographing light be incident on the CCD in a state close to a parallel light beam. Japanese Patent Application Laid-Open No. Hei 9-189856 is conventionally known as a photographing optical system that meets such a demand. The photographing optical system disclosed in JP-A-9-189856 is
The F-number is about 2.8, and it has the property of effectively suppressing the occurrence of aberrations for a half angle of view of 25 ° or more at a short focal length, and has a long back focus. Light can be incident in a state similar to a parallel light beam. However, when the back focus is lengthened in this way, there is a problem that the entire system of the photographing lens is inevitably lengthened, and a compact photographing optical system cannot be obtained.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、前記問題点
を解決するもので、射出瞳位置と像面の距離を長くする
一方、レンズ全長が短く、前玉径が小さく、且つ歪曲収
差が良好に補正された広角タイプの撮影光学系を実現す
ることを目的とする。SUMMARY OF THE INVENTION The present invention solves the above problems by increasing the distance between the exit pupil position and the image plane, shortening the overall length of the lens, reducing the diameter of the front lens, and reducing distortion. It is an object of the present invention to realize a wide-angle type photographing optical system that is well corrected.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成するため
に、請求項１の本発明は、絞りより物体側の第１群と、
絞りより像側の第２群とから構成される撮影光学系であ
って、第１群は両凹レンズ及び両凸レンズで構成され、
全体として正のパワーを持ち、第２群は正レンズと負レ
ンズを物体側より順に接合した張り合わせレンズ及び両
凸レンズからなり、全体として正のパワーを有する光学
系であることを最も主要な特徴とする。請求項２の発明
は、請求項１の撮影光学系において、第１群の前記両凸
レンズの像側の面と、第２群の正レンズと負レンズを物
体側より順に接合された張り合わせレンズの物体側の面
と、第２群の両凸レンズの像側の面とに非球面を施した
ことを主要な特徴とする。請求項３の発明は、請求項１
の撮影光学系において、第１群の前記両凸レンズの両面
と、第２群の正レンズと負レンズを物体側より順に接合
された張り合わせレンズの物体側の面と、第２群の両凸
レンズの像側の面とに非球面を施したことを最も主要な
特徴とする。請求項４の発明は、請求項２又は３記載の
撮影光学系において、第１群の前記両凸レンズの物体側
の非球面は光軸から離れるに従って曲率が大きくなるよ
うな非球面形状としたことを主要な特徴とする。請求項
５の発明は、請求項３記載の撮影光学系において、第１
群の前記両凸レンズの像側の非球面は光軸から離れるに
従って曲率が小さくなるような非球面形状としたことを
主要な特徴とする。請求項６の発明は、請求項１記載の
撮影光学系において、第１群の前記両凹レンズの両面
と、第２群の両凸レンズの像側の面とに非球面を施した
ことを最も主要な特徴とする。請求項７の発明は、請求
項６記載の撮影光学系において、第１群の前記両凹レン
ズの物体側の非球面は光軸から離れるに従って曲率半径
が大きくなり、像側の非球面は光軸から離れるに従って
曲率半径が小さくなることを最も主要な特徴とする。To achieve the above object, according to the first aspect of the present invention, there is provided a first lens unit which is closer to the object than the stop,
A photographing optical system including a second group on the image side of the stop, wherein the first group includes a biconcave lens and a biconvex lens;
The second lens group has a positive power as a whole, and the second group is composed of a cemented lens and a biconvex lens in which a positive lens and a negative lens are cemented in order from the object side. I do. According to a second aspect of the present invention, in the imaging optical system of the first aspect, an image-side surface of the biconvex lens in the first group and a positive lens and a negative lens in the second group are cemented in order from the object side. The main feature is that aspherical surfaces are provided on the object side surface and the image side surface of the biconvex lens of the second group. The invention of claim 3 is claim 1
In the imaging optical system of (1), both surfaces of the biconvex lens of the first group, the object-side surface of the cemented lens in which the positive lens and the negative lens of the second group are joined in order from the object side, and the biconvex lens of the second group The most main feature is that an aspherical surface is provided on the image side surface. According to a fourth aspect of the present invention, in the imaging optical system according to the second or third aspect, the aspheric surface on the object side of the biconvex lens of the first group has an aspheric shape such that the curvature increases as the distance from the optical axis increases. Is the main feature. According to a fifth aspect of the present invention, in the imaging optical system according to the third aspect, the first
The main feature is that the aspherical surface on the image side of the biconvex lens of the group has an aspherical shape such that the curvature decreases as the distance from the optical axis increases. According to a sixth aspect of the present invention, in the photographic optical system according to the first aspect, it is most important that both surfaces of the biconcave lens of the first group and the image-side surface of the biconvex lens of the second group are aspherical. Characteristics. According to a seventh aspect of the present invention, in the imaging optical system according to the sixth aspect, the radius of curvature of the object-side aspheric surface of the biconcave lens in the first group increases with distance from the optical axis, and the image-side aspheric surface has an optical axis. The main feature is that the radius of curvature becomes smaller as the distance from the lens increases.
【作用】上記のように構成されたズームレンズは、請求
項１においては、絞りより物体側の第１群と、絞りより
像側の第２群とから構成される撮影光学系であって、第
１群は両凹レンズ及び両凸レンズで構成され、全体とし
て正のパワーを持ち、第２群は正レンズと負レンズを物
体側より順に接合した張り合わせレンズ及び両凸レンズ
からなり、全体として正のパワーを有する光学系である
こととするので、第１群、第２群共に正のパワーを有す
る光学系であるため、歪曲収差の補正が極めて有利にな
るとともに、第１群の両凹レンズの第１面を凹面とする
ことにより前玉の有効径を小さくすることができ、又、
第１群の両凹レンズを負レンズとすることで、射出瞳と
像面との距離を長くすることができ、その結果、ＣＣＤ
に対する入射光を平行光束にすることができる。請求項
２の発明は、請求項１の撮影光学系において、第１群の
前記両凸レンズの像側の面と、第２群の正レンズと負レ
ンズを物体側より順に接合された張り合わせレンズの物
体側の面と、第２群の両凸レンズの像側の面とに非球面
を施したこととするので、更に歪曲収差を良好に補正す
ることができる。請求項３の発明は、請求項１の撮影光
学系において、第１群の前記両凸レンズの両面と、第２
群の正レンズと負レンズを物体側より順に接合された張
り合わせレンズの物体側の面と、第２群の両凸レンズの
像側の面とに非球面を施すこととするので、歪曲収差を
補正することに伴い発生する像面の面倒れを有効に補正
することができる。請求項４の発明は、請求項２又は３
記載の撮影光学系において、第１群の前記両凸レンズの
物体側の非球面は光軸から離れるに従って曲率が大きく
なるような非球面形状とするので、系全体に発生する歪
曲収差と像面の倒れを良好に補正することができる。請
求項５の発明は、請求項３記載の撮影光学系において、
第１群の前記両凸レンズの像側の非球面は光軸から離れ
るに従って曲率が小さくなるような非球面形状とするの
で、系全体に発生する歪曲収差と像面の倒れを良好に補
正することができる。請求項６の発明は、請求項１記載
の撮影光学系において、第１群の前記両凹レンズの両面
と、第２群の両凸レンズの像側の面とに非球面を施すこ
ととするので、系全体に発生する歪曲収差と像面の倒れ
を良好に補正することができる。請求項７の発明は、第
１群の前記両凹レンズの物体側の非球面は光軸から離れ
るに従って曲率半径が大きくなり、像側の非球面は光軸
から離れるに従って曲率半径が小さくなるような非球面
を施すこととするので、系全体に発生する歪曲収差と像
面の倒れを良好に補正することができる。According to the first aspect of the present invention, the zoom lens configured as described above is a photographing optical system including a first group on the object side of the diaphragm and a second group on the image side of the diaphragm. The first group is composed of a biconcave lens and a biconvex lens, and has a positive power as a whole. The second group is composed of a cemented lens and a biconvex lens in which a positive lens and a negative lens are joined in order from the object side. Since both the first and second groups are optical systems having positive power, the correction of distortion is extremely advantageous, and the first group of the biconcave lens of the first group has a positive power. By making the surface concave, the effective diameter of the front lens can be reduced,
By making the biconcave lens of the first group a negative lens, the distance between the exit pupil and the image plane can be increased, and as a result, the CCD
Can be made into a parallel light beam. According to a second aspect of the present invention, in the imaging optical system of the first aspect, an image-side surface of the biconvex lens in the first group and a positive lens and a negative lens in the second group are cemented in order from the object side. Since the aspheric surfaces are formed on the object-side surface and the image-side surface of the biconvex lens of the second group, distortion can be satisfactorily corrected. According to a third aspect of the present invention, in the imaging optical system according to the first aspect, both surfaces of the biconvex lens in the first group and the second
Aspheric surfaces are applied to the object-side surface of the cemented lens in which the positive lens and the negative lens of the group are joined in order from the object side, and the image-side surface of the biconvex lens of the second group is corrected for distortion. Thus, it is possible to effectively correct the tilt of the image plane which occurs due to this. The invention of claim 4 is the invention of claim 2 or 3
In the imaging optical system described above, the object-side aspherical surface of the biconvex lens of the first group has an aspherical shape such that the curvature increases as the distance from the optical axis increases, so that distortion occurring in the entire system and image plane aberrations occur. Fall can be corrected well. According to a fifth aspect of the present invention, in the imaging optical system according to the third aspect,
The image-side aspherical surface of the biconvex lens of the first group has an aspherical shape such that the curvature decreases as the distance from the optical axis increases, so that distortion and tilt of the image plane occurring in the entire system can be corrected well. Can be. According to a sixth aspect of the present invention, in the imaging optical system according to the first aspect, both surfaces of the biconcave lens of the first group and an image-side surface of the biconvex lens of the second group are aspherical. It is possible to satisfactorily correct distortion and image plane tilt occurring in the entire system. The invention according to claim 7 is such that the object-side aspherical surface of the biconcave lens of the first group has a larger radius of curvature as being away from the optical axis, and the image-side aspherical surface has a smaller radius of curvature as being away from the optical axis. Since an aspherical surface is provided, distortion and image plane tilt that occur in the entire system can be satisfactorily corrected.
【０００５】[0005]
【発明の実施の形態】次に、本発明の実施の形態を図面
を参照して詳細に説明する。図１は、本件発明の第１の
実施の態様に係わる撮影光学系のレンズ構成であり、物
体側より順に、第１群は両凹レンズＬ１と、両凸レンズ
Ｌ２で構成され、全体として正のパワーを持たせてあ
る。次に、第２群は正レンズＬ３と負レンズＬ４を物体
側より順に接合された張り合わせレンズＬ３４と、両凸
レンズＬ５からなり、これ又、全体として正のパワーを
有する。第１群、第２群共に正のパワーを有する光学系
であるところから、歪曲収差の補正が極めて有利にな
り、第１群の両凹レンズＬ１の第１面を凹面とすること
により前玉の有効径を小さくすることができ、又、第１
群の両凹レンズを負レンズとすることで、射出瞳と像面
との距離を長くすることができ、ＣＣＤに対する入射光
を平行光束にすることができる。図１に示した撮影光学
系において、第１群の前記両凸レンズＬ２の像側の面ｒ
４と、第２群の正レンズと負レンズを物体側より順に接
合された張り合わせレンズの物体側の面ｒ５と、第２群
の両凸レンズＬ５の像側の面ｒ１０とに非球面を施して
ある。第１群の前記両凸レンズＬ２の像側の面に施した
非球面ｒ４により、本撮影光学系の歪曲収差が良好に補
正されることとなる。図２には、第１の実施態様の収差
曲線が示されており、球面収差、非点収差、歪曲収差及
びコマ収差が充分に補正され、像の鮮鋭度を保ちつつ歪
曲収差が良好に補正されていることが明らかである。図
３に本発明の第２の態様を示す。第２の態様と図１に示
した第１の態様との相違点は、図１においては、第１群
の前記両凸レンズＬ２には像側の面ｒ４に非球面が施さ
れているのに対し、図３においては、両面、即ちｒ３、
ｒ４に非球面が施されている点である。第１群の前記両
凸レンズＬ２の物体側の面に施した非球面ｒ３により、
本撮影光学系の歪曲収差の補正に伴い発生する面倒れが
補正されることになる。図４に第２の態様の収差曲線が
示されている。球面収差、非点収差、歪曲収差及びコマ
収差が充分に補正され、像の鮮鋭度を保ちつつ歪曲収差
が良好に補正されいることに加えて、歪曲収差を補正す
ることに伴い発生する像面の面倒れが有効に補正されて
いることが明らかである。図５に本発明の第３の実施の
態様を示す。第３の態様と図１に示した第１の態様との
相違点は、図１においては、第１群の前記両凸レンズＬ
２には像側の面ｒ４に非球面が施されているのに対し、
図５においては、第１群の両凹レンズＬ１の両面ｒ１、
ｒ２に非球面が施されている点にある。この非球面は張
り合わせによるものではなく、材料自体に非球面が形成
されている。又、第２群の正レンズと負レンズを物体側
より順に接合された張り合わせレンズの物体側の面ｒ５
に非球面が施されていない点にある。図６に第２の態様
の収差曲線が示されている。球面収差、非点収差、歪曲
収差及びコマ収差が充分に補正され、像の鮮鋭度を保ち
つつ歪曲収差が良好に補正されていることが明らかであ
る。又、歪曲収差を補正することに伴い発生する像面の
面倒れも有効に補正されていることが明らかである。な
お、図２、図４、図６の球面収差の図中の破線は、正弦
条件を表し、非点収差の図中の実線はサジタル、破線は
メリディオナルを表すものとする。Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a lens configuration of a photographing optical system according to a first embodiment of the present invention. The first unit is composed of a biconcave lens L1 and a biconvex lens L2 in order from the object side, and has a positive power as a whole. It has. Next, the second group includes a cemented lens L34 in which a positive lens L3 and a negative lens L4 are cemented in order from the object side, and a biconvex lens L5, and also has a positive power as a whole. Since both the first and second units are optical systems having a positive power, correction of distortion is extremely advantageous. By making the first surface of the biconcave lens L1 of the first unit a concave surface, The effective diameter can be reduced.
By making the biconcave lens of the group a negative lens, the distance between the exit pupil and the image plane can be increased, and the light incident on the CCD can be converted into a parallel light beam. In the imaging optical system shown in FIG. 1, the image-side surface r of the biconvex lens L2 of the first group
4, an aspheric surface is formed on an object-side surface r5 of a cemented lens in which a positive lens and a negative lens of the second group are joined in order from the object side, and an image-side surface r10 of the biconvex lens L5 of the second group. is there. The aspherical surface r4 applied to the image-side surface of the biconvex lens L2 of the first group can satisfactorily correct the distortion of the photographing optical system. FIG. 2 shows an aberration curve of the first embodiment, in which spherical aberration, astigmatism, distortion, and coma are sufficiently corrected, and distortion is well corrected while maintaining image sharpness. It is clear that. FIG. 3 shows a second embodiment of the present invention. The difference between the second embodiment and the first embodiment shown in FIG. 1 is that, in FIG. 1, the biconvex lens L2 of the first group has an aspheric surface on the image side surface r4. On the other hand, in FIG. 3, both sides, ie, r3,
The point that r4 is aspherical. By the aspherical surface r3 applied to the object-side surface of the biconvex lens L2 of the first group,
The surface tilt occurring due to the correction of the distortion of the main photographing optical system is corrected. FIG. 4 shows the aberration curve of the second mode. Spherical aberration, astigmatism, distortion, and coma are sufficiently corrected, and distortion is well corrected while maintaining image sharpness. Is clearly corrected. FIG. 5 shows a third embodiment of the present invention. The difference between the third embodiment and the first embodiment shown in FIG. 1 is that, in FIG.
2 has an aspherical surface on the image side surface r4,
In FIG. 5, both surfaces r1 of the biconcave lens L1 of the first group,
The point is that r2 is aspherical. The aspheric surface is not formed by bonding, but the aspheric surface is formed on the material itself. The object side surface r5 of the cemented lens in which the positive lens and the negative lens of the second group are cemented in order from the object side.
Is not provided with an aspherical surface. FIG. 6 shows an aberration curve of the second mode. It is clear that spherical aberration, astigmatism, distortion, and coma are sufficiently corrected, and distortion is well corrected while maintaining image sharpness. It is also apparent that the image plane tilt caused by correcting the distortion is effectively corrected. The broken lines in the spherical aberration diagrams in FIGS. 2, 4, and 6 represent sine conditions, the solid lines in the astigmatism diagrams represent sagittal, and the broken lines represent meridional.
【０００６】次に、本発明の具体的実施例を表１、表２
及び表３に示す。まず、実施例における記号の意味は以
下の通りである。 R ：曲率半径 D ：面間隔 Nd ：屈折率 νd ：アッベ数 K ：非球面の円錐定数 A4 ：４次の非球面係数 A6 ：６次の非球面係数 A8 ：８次の非球面係数 A10 ：10次の非球面係数 ＜表１＞ 面番号 R D Nd νd 1 -9.46349 1.000000 1.531720 48.8375 2 5.66841 1.143682 3 20.76594 2.853499 1.772500 49.6243 4 -6.18408 0.020000 1.507030 53.4300 5 -7.17606 1.322908 6 0.00000 1.779890 7 11.47928 0.020000 1.507030 53.4300 8 6.86206 3.000000 1.696802 55.4597 9 -6.86206 1.000000 1.688931 31.1589 10 6.86206 0.500000 11 23.47267 2.517279 1.620409 60.3438 12 -9.24072 0.020000 1.507030 53.4300 13 -9.59620 1.000000 14 0.00000 4.110000 1.516798 64.1983 15 0.00000 Asp K A4 A6 A8 A10 5 -2.621793 -0.125965E-03 -0.152025E-04 -0.214249E-05 0.101480E-06 7 -6.687292 0.188979E-02 -0.358470E-04 0.226804E-05 -0.179228E-06 13 -15.069688 -0.846792E-03 0.158576E-03 -0.678005E-05 0.299010E-06 ＜表２＞ 面番号 R D Nd νd 1 -9.81900 1.00000 1.53172 48.84 2 5.04600 1.12000 1.00000 3 14.91600 0.05000 1.50703 53.43 4 13.12700 2.88000 1.77250 49.62 5 -6.56300 0.02000 1.50703 53.43 6 -8.07400 1.26000 1.00000 7 0.00000 1.77000 1.00000 8 10.28300 0.02000 1.50703 53.43 9 6.67100 3.00000 1.69680 55.46 10 -6.67100 1.00000 1.68893 31.16 11 6.67100 0.50000 1.00000 12 28.59000 2.52000 1.62041 60.34 13 -8.59900 0.02000 1.50703 53.43 14 -9.22900 1.00000 1.00000 15 0.00000 4.11000 1.51680 64.20 16 0.00000 Asp K A4 A6 A8 A10 3 -9.89000 7.76600E-04 -3.92900E-05 7.38300E-06 -3.69300E-07 5 -3.07500 -1.23100E-04 -4.48800E-05 4.38700E-06 -3.02700E-07 8 8.38400 -4.88300E-05 -8.03400R-05 3.57900E-06 -9.08700E-07 14 -20.18500 -1.94300E-03 2.82100E-04 -1.74600E-05 6.54200E-07 ＜表３＞ 面番号 R D Nd νd 1 -3.56840 1.00000 1.58313 59.46 2 6.95260 0.50000 1.00000 3 6.29980 2.22000 1.69700 48.51 4 -6.29980 0.50000 1.00000 5 0.00000 0.50000 1.00000 6 4.58330 2.17000 1.69700 48.51 7 -4.58330 0.00000 1.00000 8 -4.58330 1.00000 1.74077 27.76 9 4.58330 0.50000 1.00000 10 -35.60000 1.98000 1.62041 60.34 11 -4.71250 0.02000 1.50703 53.43 12 -4.76980 0.49000 1.00000 13 0.00000 4.11000 1.51680 64.20 16 0.00000 Asp K A4 A6 A8 A10 1 -7.55000 3.18000E-03 -1.15000E-03 1.45000E-04 -7.04000E-06 2 6.14000 1.72000E-02 -3.82000E-03 4.04000E-04 -2.29000E-05 12 -7.82000 -5.50000E-03 1.24000E-03 -1.28000E-04 1.17000E-05Next, specific examples of the present invention are shown in Tables 1 and 2.
And Table 3. First, the meanings of the symbols in the examples are as follows. R: radius of curvature D: spacing N d : refractive index ν d : Abbe number K: aspherical conic constant A 4 : fourth-order aspherical coefficient A 6 : sixth-order aspherical coefficient A 8 : eighth-order non-spherical coefficient Spherical coefficient A 10 : 10th order aspherical coefficient <Table 1> Surface number RDN d ν d 1 -9.46349 1.000000 1.531720 48.8375 2 5.66841 1.143682 3 20.76594 2.853499 1.772500 49.6243 4 -6.18408 0.020000 1.507030 53.4300 5 -7.17606 1.322908 6 0.00000 1.779890 7 11.47928 0.020000 1.507030 53.4300 8 6.86206 3.000000 1.696802 55.4597 9 -6.86206 1.000000 1.688931 31.1589 10 6.86206 0.500000 11 23.47267 2.517279 1.620409 60.3438 12 -9.24072 0.020000 1.507030 53.4300 13 -9.59620 1.000000 14 0.00000 4.110000 1.516798 64.1983 15 0.00000 Asp K A10 A6 A6A6 E-03 -0.152025E-04 -0.214249E-05 0.101480E-06 7 -6.687292 0.188979E-02 -0.358470E-04 0.226804E-05 -0.179228E-06 13 -15.069688 -0.846792E-03 0.158576E-03 -0.678005E-05 0.299010E-06 <Table 2> Surface number RDN d ν d 1 -9.81900 1.00000 1.53172 48.84 2 5.04 600 1.12000 1.00000 3 14.91600 0.05000 1.50703 53.43 4 13.12700 2.88000 1.77250 49.62 5 -6.56300 0.02000 1.50703 53.43 6 -8.07400 1.26000 1.00000 7 0.00000 1.77000 1.00000 8 10.28300 0.02000 1.50703 53.43 9 6.67100 3.00000 1.69680 55.46 10 -6.67100 1.00000 1.68893 31000016. 2.52000 1.62041 60.34 13 -8.59900 0.02000 1.50703 53.43 14 -9.22900 1.00000 1.00000 15 0.00000 4.11000 1.51680 64.20 16 0.00000 Asp K A4 A6 A8 A10 3 -9.89000 7.76600E-04 -3.92900E-05 7.38300E-06 -3.69300E-07 5- 3.07500 -1.23100E-04 -4.48800E-05 4.38700E-06 -3.02700E-07 8 8.38400 -4.88300E-05 -8.03400R-05 3.57900E-06 -9.08700E-07 14 -20.18500 -1.94300E-03 2.82100 E-04 -1.74600E-05 6.54200E-07 <Table 3> Surface number RDN d ν d 1 -3.56840 1.00000 1.58313 59.46 2 6.95260 0.50000 1.00000 3 6.29980 2.22000 1.69700 48.51 4 -6.29980 0.50000 1.00000 5 0.00000 0.50000 1.00000 6 4.58330 2.17000 1.69700 48.51 7 -4.58330 0.00000 1.00000 8 -4.58330 1.00000 1.74077 27.76 9 4.58330 0.50000 1.00000 10 -35.60000 1.98000 1.62041 60.34 11 -4.71250 0.02000 1.50703 53.43 12 -4.76980 0.49000 1.00000 13 0.00000 4.11000 1.51680 64.20 16 0.00000 Asp K A4 A6 A8 A10 1 -7.55000 3.18000E-03 -1.15000E-03 1.45000E-04 -7.04000E- 06 2 6.14000 1.72000E-02 -3.82000E-03 4.04000E-04 -2.29000E-05 12 -7.82000 -5.50000E-03 1.24000E-03 -1.28000E-04 1.17000E-05
【０００７】[0007]
【発明の効果】上記のように構成された撮影光学系は、
請求項１においては、絞りより物体側の第１群と、絞り
より像側の第２群とから構成される撮影光学系であっ
て、第１群は両凹レンズ及び両凸レンズで構成され、全
体として正のパワーを持ち、第２群は正レンズと負レン
ズを物体側より順に接合した張り合わせレンズ及び両凸
レンズからなり、全体として正のパワーを有する光学系
であることとしたので、第１群、第２群共に正のパワー
を有する光学系であるため、歪曲収差の補正が極めて有
利になるとともに、第１群の両凹レンズの第１面を凹面
とすることにより前玉の有効径を小さくすることがで
き、又、第１群の両凹レンズを負レンズとすることで、
射出瞳と像面との距離を長くすることができ、その結
果、ＣＣＤに対する入射光を平行光束にすることができ
る撮影光学系を提供することができた。請求項２の発明
は、請求項１の撮影光学系において、第１群の前記両凸
レンズの像側の面と、第２群の正レンズと負レンズを物
体側より順に接合された張り合わせレンズの物体側の面
と、第２群の両凸レンズの像側の面とに非球面を施した
こととしたので、更に歪曲収差を良好に補正することが
できる撮影光学系を提供することができた。請求項３の
発明は、請求項１の撮影光学系において、第１群の前記
両凸レンズの両面と、第２群の正レンズと負レンズを物
体側より順に接合された張り合わせレンズの物体側の面
と、第２群の両凸レンズの像側の面とに非球面を施すこ
ととしたので、歪曲収差を補正することに伴い発生する
像面の面倒れを有効に補正することができる撮影光学系
を提供することができた。The photographing optical system configured as described above has:
2. A photographing optical system according to claim 1, comprising a first group on the object side of the stop and a second group on the image side of the stop, wherein the first group includes a biconcave lens and a biconvex lens. The second group is composed of a cemented lens in which a positive lens and a negative lens are joined in order from the object side and a biconvex lens, and the first group is an optical system having a positive power as a whole. Since both the second group and the second group are optical systems having a positive power, the correction of distortion is extremely advantageous, and the effective diameter of the front lens is reduced by making the first surface of the biconcave lens of the first group concave. By making the biconcave lens of the first group a negative lens,
The distance between the exit pupil and the image plane can be increased, and as a result, an imaging optical system capable of converting incident light to the CCD into a parallel light beam can be provided. According to a second aspect of the present invention, in the imaging optical system of the first aspect, an image-side surface of the biconvex lens in the first group and a positive lens and a negative lens in the second group are cemented in order from the object side. Since the aspherical surface is used for the object side surface and the image side surface of the biconvex lens of the second group, it is possible to provide a photographic optical system which can further satisfactorily correct distortion. . According to a third aspect of the present invention, in the imaging optical system of the first aspect, both surfaces of the biconvex lens of the first group, and the object side of the cemented lens in which the positive lens and the negative lens of the second group are sequentially joined from the object side. Since the surface and the image-side surface of the biconvex lens of the second group are aspherical, imaging optics that can effectively correct the image plane tilt caused by correcting the distortion. The system could be provided.
【０００８】請求項４の発明は、請求項２又は３記載の
撮影光学系において、第１群の前記両凸レンズの物体側
の非球面は光軸から離れるに従って曲率が大きくなるよ
うな非球面形状としたので、系全体に発生する歪曲収差
と像面の倒れを良好に補正することができる撮影光学系
を提供することができた。請求項５の発明は、請求項３
記載の撮影光学系において、第１群の前記両凸レンズの
像側の非球面は光軸から離れるに従って曲率が小さくな
るような非球面形状としたので、系全体に発生する歪曲
収差と像面の倒れを良好に補正することができる撮影光
学系を提供することができた。請求項６の発明は、請求
項１記載の撮影光学系において、第１群の前記両凹レン
ズの両面と、第２群の両凸レンズの像側の面とに非球面
を施すこととしたので、系全体に発生する歪曲収差と像
面の倒れを良好に補正することができる撮影光学系を提
供することができた。請求項７の発明は、請求項６記載
の撮影光学系において、前記両凹レンズの物体側の非球
面は光軸から離れるに従って曲率半径が大きくなり、像
側の面は光軸から離れるに従って曲率半径が小さくなる
非球面を施すこととしたので、系全体に発生する歪曲収
差と像面の倒れを良好に補正することができる撮影光学
系を提供することができた。According to a fourth aspect of the present invention, in the photographing optical system according to the second or third aspect, the aspheric surface on the object side of the biconvex lens of the first group has a curvature that increases as the distance from the optical axis increases. Therefore, it was possible to provide a photographing optical system capable of satisfactorily correcting distortion and image plane tilt occurring in the entire system. The invention of claim 5 is the invention of claim 3
In the imaging optical system described in the above, the image side aspherical surface of the biconvex lens of the first group has an aspherical shape such that the curvature decreases as the distance from the optical axis increases, so that distortion occurring in the entire system and image plane aberrations occur. A photographing optical system capable of favorably correcting the fall was provided. According to a sixth aspect of the present invention, in the imaging optical system according to the first aspect, both surfaces of the biconcave lens of the first group and an image-side surface of the biconvex lens of the second group are aspherical. An imaging optical system capable of favorably correcting distortion and image plane tilt occurring in the entire system can be provided. According to a seventh aspect of the present invention, in the imaging optical system according to the sixth aspect, the radius of curvature of the object-side aspheric surface of the biconcave lens increases with distance from the optical axis, and the radius of curvature of the image-side surface increases with distance from the optical axis. Since an aspherical surface having a small surface area is provided, it is possible to provide an imaging optical system capable of satisfactorily correcting distortion and image plane tilt occurring in the entire system.
【図１】本発明の撮影光学系の第１の実施態様の説明図
である。FIG. 1 is an explanatory diagram of a first embodiment of a photographing optical system of the present invention.
【図２】本発明の撮影光学系の第１の実施態様の収差曲
線図である。FIG. 2 is an aberration curve diagram of the first embodiment of the imaging optical system of the present invention.
【図３】本発明の撮影光学系の第２の実施態様の説明図
である。FIG. 3 is an explanatory diagram of a second embodiment of the photographing optical system of the present invention.
【図４】本発明の撮影光学系の第２の実施態様の収差曲
線図である。FIG. 4 is an aberration curve diagram of the second embodiment of the imaging optical system of the present invention.
【図５】本発明の撮影光学系の第３の実施態様の説明図
である。FIG. 5 is an explanatory diagram of a third embodiment of the photographing optical system of the present invention.
【図６】本発明の撮影光学系の第３の実施態様の収差曲
線図である。FIG. 6 is an aberration curve diagram of the third embodiment of the imaging optical system of the present invention.
Ｌ１ 両凹レンズ Ｌ２ 両凸レンズ Ｌ３ 正レンズ Ｌ４ 負レンズ Ｌ５ 両凸レンズ Ｌ３４ 張り合わせレンズ ｒ１ 物体側の面 ｒ２ 像側の面 ｒ３ 物体側の面 ｒ４ 像側の面 ｒ５ 物体側の面 ｒ１０ 像側の面 L1 Biconcave lens L2 Biconvex lens L3 Positive lens L4 Negative lens L5 Biconvex lens L34 Laminated lens r1 Object side surface r2 Image side surface r3 Object side surface r4 Image side surface r5 Object side surface r10 Image side surface
Claims (7)
側の第２群とから構成される撮影光学系であって、第１
群は両凹レンズ及び両凸レンズで構成され、全体として
正のパワーを持ち、第２群は正レンズと負レンズを物体
側より順に接合した張り合わせレンズ及び両凸レンズか
らなり、全体として正のパワーを有する光学系であるこ
とを特徴とする撮影光学系。1. A photographing optical system comprising a first group on the object side of the stop and a second group on the image side of the stop, wherein
The group is composed of a biconcave lens and a biconvex lens, and has a positive power as a whole. The second group is composed of a cemented lens and a biconvex lens in which a positive lens and a negative lens are joined in order from the object side, and has a positive power as a whole. An imaging optical system, which is an optical system.
の前記両凸レンズの像側の面と、第２群の正レンズと負
レンズを物体側より順に接合された張り合わせレンズの
物体側の面と、第２群の両凸レンズの像側の面とに非球
面を施したことを特徴とする撮影光学系。2. The imaging optical system according to claim 1, wherein the image-side surface of the biconvex lens of the first group and the object side of the cemented lens in which the positive lens and the negative lens of the second group are joined in order from the object side. And a surface on the image side of the biconvex lens of the second group having an aspheric surface.
の前記両凸レンズの両面と、第２群の正レンズと負レン
ズを物体側より順に接合された張り合わせレンズの物体
側の面と、第２群の両凸レンズの像側の面とに非球面を
施したことを特徴とする撮影光学系。3. The imaging optical system according to claim 1, wherein both surfaces of the biconvex lens of the first group, and an object-side surface of a cemented lens in which the positive lens and the negative lens of the second group are joined in order from the object side. A photographing optical system characterized in that an aspherical surface is formed on the image-side surface of the biconvex lens of the second group.
て、第１群の前記両凸レンズの物体側の非球面は光軸か
ら離れるに従って曲率が大きくなるような非球面形状と
したことを特徴とする撮影光学系。4. The imaging optical system according to claim 2, wherein the aspherical surface on the object side of the biconvex lens of the first group has an aspherical shape such that the curvature increases as the distance from the optical axis increases. The shooting optical system.
１群の前記両凸レンズの像側の非球面は光軸から離れる
に従って曲率が小さくなるような非球面形状としたこと
を特徴とする撮影光学系。5. The imaging optical system according to claim 3, wherein the aspheric surface on the image side of the biconvex lens of the first group has an aspherical shape such that the curvature decreases as the distance from the optical axis increases. Shooting optical system.
１群の前記両凹レンズの両面と、第２群の両凸レンズの
像側の面とに非球面を施したことを特徴とする撮影光学
系。6. The imaging optical system according to claim 1, wherein an aspheric surface is applied to both surfaces of the biconcave lens of the first group and an image-side surface of the biconvex lens of the second group. Optical system.
１群の前記両凹レンズの物体側の非球面は光軸から離れ
るに従って曲率半径が大きくなり、像側の非球面は光軸
から離れるに従って曲率半径が小さくなることを特徴と
する撮影光学系。7. The imaging optical system according to claim 6, wherein the radius of curvature of the object-side aspheric surface of the biconcave lens in the first group increases with distance from the optical axis, and the image-side aspheric surface increases with distance from the optical axis. A photographing optical system characterized in that the radius of curvature decreases according to the following.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28045699A JP4245749B2 (en) | 1999-09-30 | 1999-09-30 | Imaging optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28045699A JP4245749B2 (en) | 1999-09-30 | 1999-09-30 | Imaging optical system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001100092A true JP2001100092A (en) | 2001-04-13 |
| JP4245749B2 JP4245749B2 (en) | 2009-04-02 |
Family
ID=17625324
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28045699A Expired - Fee Related JP4245749B2 (en) | 1999-09-30 | 1999-09-30 | Imaging optical system |
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| Country | Link |
|---|---|
| JP (1) | JP4245749B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6985309B2 (en) | 2003-03-31 | 2006-01-10 | Fujinon Corporation | Imaging lens |
| JP2006030290A (en) * | 2004-07-12 | 2006-02-02 | Olympus Corp | Imaging apparatus |
| US7418199B2 (en) | 2004-07-12 | 2008-08-26 | Olympus Corporation And Olympus Imaging Corp. | Imaging apparatus |
| US9715088B1 (en) | 2016-06-04 | 2017-07-25 | Largan Precision Co., Ltd. | Photographing optical lens system, image capturing apparatus and electronic device |
| CN109100857A (en) * | 2018-09-21 | 2018-12-28 | 杭州有人光电技术有限公司 | A kind of low full HD projection lens that distorts of low F number |
| JP2020122909A (en) * | 2019-01-31 | 2020-08-13 | エスゼット ディージェイアイ テクノロジー カンパニー リミテッドＳｚ Ｄｊｉ Ｔｅｃｈｎｏｌｏｇｙ Ｃｏ．，Ｌｔｄ | Lens system, imaging apparatus and moving body |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5370109B2 (en) | 2009-12-02 | 2013-12-18 | 株式会社リコー | Imaging lens and imaging apparatus |
-
1999
- 1999-09-30 JP JP28045699A patent/JP4245749B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6985309B2 (en) | 2003-03-31 | 2006-01-10 | Fujinon Corporation | Imaging lens |
| JP2006030290A (en) * | 2004-07-12 | 2006-02-02 | Olympus Corp | Imaging apparatus |
| US7418199B2 (en) | 2004-07-12 | 2008-08-26 | Olympus Corporation And Olympus Imaging Corp. | Imaging apparatus |
| JP4632706B2 (en) * | 2004-07-12 | 2011-02-16 | オリンパス株式会社 | Imaging device |
| US9715088B1 (en) | 2016-06-04 | 2017-07-25 | Largan Precision Co., Ltd. | Photographing optical lens system, image capturing apparatus and electronic device |
| CN109100857A (en) * | 2018-09-21 | 2018-12-28 | 杭州有人光电技术有限公司 | A kind of low full HD projection lens that distorts of low F number |
| JP2020122909A (en) * | 2019-01-31 | 2020-08-13 | エスゼット ディージェイアイ テクノロジー カンパニー リミテッドＳｚ Ｄｊｉ Ｔｅｃｈｎｏｌｏｇｙ Ｃｏ．，Ｌｔｄ | Lens system, imaging apparatus and moving body |
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| Publication number | Publication date |
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| JP4245749B2 (en) | 2009-04-02 |
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