JPH03182712A

JPH03182712A - Read lens for scanner

Info

Publication number: JPH03182712A
Application number: JP32356189A
Authority: JP
Inventors: Yuuichirou Kanoshima; 彼島　雄一郎; Koji Ichinomiya; 一宮　孝司
Original assignee: Ricoh Co Ltd
Current assignee: Ricoh Co Ltd
Priority date: 1989-12-13
Filing date: 1989-12-13
Publication date: 1991-08-08

Abstract

PURPOSE:To obtain the read lens for a scanner being bright, having a wide view angle and being excellent in resolving power by forming fourth, sixth and tenth lens surfaces from an object side to aspherical surfaces, and allowing a conical constant of the aspherical surface to satisfy a specific condition. CONSTITUTION:A first lens, second lens, third lens, fourth lens, fifth lens, and a sixth lens are a positive meniscus lens, negative meniscus lens, negative meniscus lens, negative meniscus lens, biconcave lens, and a biconvex lens, respectively. In such a state, fourth, sixth and tenth lens surfaces from an object side are formed to aspherical surfaces, and conical constants K4, K6 and K10 of these aspherical surfaces are allowed to satisfy conditions shown by the expression. Accordingly, a fourth lens surface, a sixth lens surface and a tenth lens surface become the elliptical surface being rotation symmetrical to the major axis, the elliptical surface being rotation symmetrical to the minor axis, and the elliptical surface being rotation symmetrical to the minor axis, respectively, and the smallest comatic flare is obtained. In such a way, a lens having a sufficiently high contrast and being bright is obtained.

Description

【発明の詳細な説明】［産業上の利用分野コ本発明は、スキャナー用読取レンズに関する。[Detailed description of the invention] [Industrial application fields] The present invention relates to a reading lens for a scanner.

［従来の技術］原稿の縮小像をＣＣＤ等の固体撮像素子上に結像させ、
原稿を走査して原稿画像を読取る原稿読取は、イメージ
スキャナー、ファクシミリ、デジタル複写機等に関連し
て知られている。[Prior art] A reduced image of a document is formed on a solid-state image sensor such as a CCD,
2. Description of the Related Art Document reading, which scans a document and reads a document image, is known in connection with image scanners, facsimile machines, digital copying machines, and the like.

スキャナー用読取レンズは、上記の如き原稿読取に於い
て、原稿の縮小像を固体撮像素子上に結像させるための
レンズである。A scanner reading lens is a lens for forming a reduced image of a document on a solid-state image sensor during the above-described document reading.

スキャナー用読取レンズは、原稿読取装置の小型化を実
現する観点から物像間距離の小さい広画角のものである
ことが要請され、また原稿読取の高速化の観点から大口
径で明るいものであることが要請される。さらに近年、
固体撮像素子の画素サイズが小さくなってきていること
に鑑み、固体撮像素子の能力を生かした高解像力の読取
を可能にするためには、スキャナー用読取レンズにも高
解像力が求められる。例えば１画素サイズが７μｍのＣ
ＣＤを用いた読取装置の場合であれば、スキャナー用読
取レンズにはＣＯＤの受光面上で７１．４本／ｍｍの解
像力が必要となり、しがも上記受光面全域にわたって、
上記空間周波数に対して高いコントラストが要求される
。Reading lenses for scanners are required to have a wide angle of view with a small object-to-image distance in order to make document reading devices more compact, and also to be large in diameter and bright in order to speed up document reading. Something is required. Furthermore, in recent years,
In view of the fact that the pixel size of solid-state image sensors is becoming smaller, reading lenses for scanners are also required to have high resolution in order to enable high-resolution reading that takes advantage of the capabilities of solid-state image sensors. For example, C with one pixel size of 7 μm
In the case of a reading device using a CD, the reading lens for the scanner requires a resolution of 71.4 lines/mm on the light receiving surface of the COD, and over the entire area of the light receiving surface,
High contrast is required for the above spatial frequencies.

広画角に適したレンズとして従来からトボゴン型レンズ
が知られている。トポボン型はラジアル像面が平坦であ
る。Tobogon type lenses have been known as lenses suitable for wide angles of view. The Topobon type has a flat radial image surface.

このような観点からトポボン型のスキャナー用読取レン
ズが提案されている（例えば、特開昭６３−７５７２１
号公報、同８４−２３２１５号公報）。From this point of view, a topobon type scanner reading lens has been proposed (for example, Japanese Patent Application Laid-Open No. 63-75721
No. 84-23215).

［発明が解決しようとする課題］しかし反面、トポボン型のレンズは明るさに欠けるとい
う問題があり原稿読取の高速化の要請に答えるのが困難
である。さらに、像面の色割れが広画角になるほど大き
くなってコントラストが低下するという問題もある。[Problems to be Solved by the Invention] However, on the other hand, the Topobon type lens has the problem of lacking brightness, making it difficult to meet the demand for faster document reading. Furthermore, there is also the problem that the wider the angle of view, the greater the color breakup on the image plane, resulting in a decrease in contrast.

本発明は上述した事情に鑑みてなされたものであって、
トポボン型レンズをベースとし、Ｆ６゜＝３と明るく、
広画角で解像力に優れた新規なスキャナー用読取レンズ
の提供を目的とする。The present invention was made in view of the above-mentioned circumstances, and
Based on a Topobon type lens, it is bright at F6° = 3,
The objective is to provide a new reading lens for scanners with a wide angle of view and excellent resolution.

［課題を解決する手段］以下、本発明を説明する。[Means to solve problems] The present invention will be explained below.

本発明のスキャナー用読取レンズは「縮小倍率で使用さ
れる原稿読取用のレンズ」であって、物体側から像側へ
向かって第１ないし第５群を順次配列し、第２群と第３
群との間に絞りを配してなる５群７枚構成である。The scanner reading lens of the present invention is a "document reading lens used with reduction magnification", and has first to fifth groups arranged sequentially from the object side to the image side, and the second and third groups.
It is composed of 7 elements in 5 groups with an aperture between the groups.

請求項１〜５のレンズとも、レンズの基本構成は同一で
ある。The basic structure of the lenses of claims 1 to 5 is the same.

即ち、第１図に示すように「第１群」は、正レンズであ
る第１レンズＩＯと、その像側に接合された負レンズで
ある第２レンズ１２とにより構成される。「第２群」は
、物体側に凸面を向けたメニスカスレンズである第３□
ンズ１４である。「第３群」は、像側に凸面を向けたメ
ニスカスレンズである第４レンズ１６である。「第４群
」は、負レンズである第５レンズエ８と、その像側に接
合された正レンズである第６レンズ２０とにより構成さ
れる。That is, as shown in FIG. 1, the "first group" is composed of a first lens IO, which is a positive lens, and a second lens 12, which is a negative lens cemented to the image side of the first lens IO. The "second group" is the third □ which is a meniscus lens with a convex surface facing the object side.
This is lens 14. The "third group" is the fourth lens 16, which is a meniscus lens with a convex surface facing the image side. The "fourth group" is composed of a fifth lens element 8, which is a negative lens, and a sixth lens element 20, which is a positive lens cemented to the image side thereof.

「第５群」は、平行平面ガラスである第７レンズ２２で
あり、具体的には固体撮像素子の受光面のカバーガラス
である。The "fifth group" is the seventh lens 22 which is a parallel plane glass, and specifically is a cover glass of the light receiving surface of the solid-state image sensor.

第２群をなす第３レンズ１４と第３群をなす第４レンズ
１６との間には、絞り１５が配備される。A diaphragm 15 is provided between the third lens 14 forming the second group and the fourth lens 16 forming the third group.

さらに、請求項１〜５のレンズとも、上記の基本構成に
於いて、３つのレンズ面に非球面を採用した点に於いて
共通している。Furthermore, the lenses of claims 1 to 5 have in common that, in the above basic configuration, three lens surfaces are aspherical.

請求項１のレンズは、物体側から数えて第４゜第６．第
１０番目のレンズ面が非球面であり、これらの非球面の
円錐定数に４．に６．Ｋｌ。が、（１−１）　　　　　
　　　−０．０６＜　　Ｋ、　　＜　　−０，０１（１
−ＩＩ）　　　　０．０　　＜　Ｋ６＜　　０．０４（
１−ＩＩＩ）　　　　　　０．０　　　（Ｋｌ。＜　　
　０．０２なる条件を満足する。勿論、円錐定数にのサ
フィックスは「非球面を採用されたレンズ面」の物体側
からの順位を示し、例えば上記に４は物体側から第４番
目のレンズ面が非球面であるときの、この非球面の円錐
定数を表す。In the lens according to the first aspect of the present invention, the lens has a diameter of 4 degrees and 6 degrees, counting from the object side. The tenth lens surface is an aspherical surface, and the conic constant of these aspherical surfaces is 4. 6. Kl. But (1-1)
−0.06<K, <−0,01(1
-II) 0.0 < K6 < 0.04 (
1-III) 0.0 (Kl.<
The condition of 0.02 is satisfied. Of course, the suffix to the conic constant indicates the order of the "lens surface with an aspherical surface" from the object side. For example, 4 above indicates this when the fourth lens surface from the object side is an aspherical surface. Represents the conic constant of an aspheric surface.

請求項２のレンズは、物体側から数えて第３゜第６．第
１０番目のレンズ面が非球面であり、これらの非球面の
円錐定数ＫｓｔＫｓｔＫ＋ｏが、（２（）　　　　　　
　　　０．０　　　＜　　Ｋｓ　　＜　　　１．０（２
−ＩＩ）　　　　　　　　０．０　　　＜　　ＫＧ　　
＜　　　０．０２（２−ＩＩＩ）　　　−０，００６＜
　Ｋ、、＜　　０．０４５なる条件を特徴する請求項３のレンズは、物体側から数えて第３゜第７．第
８番目のレンズ面が非球面であり、これらの非球面の円
錐定数に３．に７−Ｋｍが。In the lens according to the second aspect of the present invention, the lens has a diameter of 3° and 6th, counting from the object side. The tenth lens surface is an aspherical surface, and the conic constant KstKstK+o of these aspherical surfaces is (2()
0.0 < Ks < 1.0 (2
-II) 0.0 < KG
<0.02(2-III) -0,006<
The lens according to claim 3, which is characterized by the condition that K, , < 0.045, has an angle of 3° and 7° as counted from the object side. The eighth lens surface is an aspherical surface, and the conic constant of these aspherical surfaces is 3. 7-Km.

（３−Ｉ）　　　　　　　　　　０．０　　　　＜　　
Ｋ　３　＜　　　０．８７（３−ＩＩ）　　　　　　　
　−０，０２５＜　　Ｋ、　　＜　　　０．０（３−Ｉ
ＩＩ）　　　　　　、　　　０．０　　　　＜　　Ｋａ
　　＜　　１０．０なる条件を特徴する請求項４のレンズは、物体側から数えて第３゜第７．第
１０番目のレンズ面が非球面であり、これらの非球面の
円錐定数Ｋｓ、Ｋｔ、に□。が、（４−１）　　　　　
　　　　０．０　　　　＜　　Ｋｓ　　＜　　　１．２
（４−ＩＩ）　　　　　−０，０４５＜　Ｋ、　　＜　
　０．０（４−ＩＩＩ）　　　　　　−０，００６＜　
　Ｋｌ　。＜　　　０．００７なる条件を特徴する請求項５のレンズは、物体側から数えて第３゜第８．第
１０番目のレンズ面が非球面であり、これらの非球面の
円錐定数に３．Ｋａ、Ｋｘ。が、（５−Ｉ）　　　　　
　　　　　０．０　　　＜　　Ｋ３　＜　　　０．８（
５−ＩＩ）　　　　０．０　　＜　Ｋ、　＜　１３．０
（５−ＩＩＩ）　　　−０，０２２（Ｋｌ。〈０．０な
る条件を満足する。(3-I) 0.0 <
K3 < 0.87 (3-II)
−0,025<K,<0.0(3-I
II), 0.0 < Ka
The lens according to claim 4, which is characterized by the condition <10.0, has an angle of 3° and 7.0° as counted from the object side. The tenth lens surface is an aspherical surface, and the conic constants Ks and Kt of these aspherical surfaces are □. But (4-1)
0.0 < Ks < 1.2
(4-II) -0,045<K,<
0.0(4-III) -0,006<
Kl. The lens according to claim 5, which is characterized by the condition of <0.007, has an angle of 3° and an 8th angle as counted from the object side. The tenth lens surface is an aspherical surface, and the conic constant of these aspherical surfaces is 3. Ka, Kx. However, (5-I)
0.0 < K3 < 0.8 (
5-II) 0.0 < K, < 13.0
(5-III) −0,022(Kl. satisfies the condition <0.0.

なお、非球面は良く知られたように、Ｘを光軸方向にと
りＨを光軸直交方向の高さ、光軸上曲率半径の逆数をＣ
とするとき、曲線Ｘ＝［Ｃ）Ｉ２／（１４１−１４Ｋ　ＣＨ”）］＋Ａ２
・Ｈ２＋Ａ３・Ｈ３＋Ａ、・Ｈ４・・・・＋Ａ１゜・Ｈ
ＩＯ＋・・を光軸の回りに回転して得られる曲面であり
、円錐定数は上の式中のＫである。As is well known, for an aspheric surface, X is the direction of the optical axis, H is the height perpendicular to the optical axis, and C is the reciprocal of the radius of curvature on the optical axis.
Then, curve X=[C)I2/(141-14K CH”)]+A2
・H2+A3・H3+A,・H4・・・・+A1゜・H
It is a curved surface obtained by rotating IO+... around the optical axis, and the conic constant is K in the above formula.

［作　　用］請求項１〜５のレンズとも広画角を達成するためにトポ
ボン型をベースとしている。トボゴン型レンズはラジア
ル像面の曲がりが小さく平坦である反面、像面の色割れ
が広画角になるほど大きくなりコントラストを低下させ
る。この色割れによるコントラスト低下の問題を解決す
るために、第１群と第４群とを正負レンズの貼り合わせ
レンズとした。このようにすることによりトポボン型本
来の長所たるラジアル像面の平坦性を維持しつつ、像面
の色割れを抑えることができた。[Function] The lenses according to claims 1 to 5 are all based on the topobon type in order to achieve a wide angle of view. Although the tobogon lens has a flat radial image surface with little curvature, the color breakage on the image surface increases as the angle of view increases, reducing contrast. In order to solve the problem of reduced contrast due to color cracking, the first group and the fourth group are made of a combination of positive and negative lenses. By doing this, it was possible to maintain the flatness of the radial image plane, which is an inherent advantage of the Topobon type, and to suppress color breakup on the image plane.

また、大口径化を実現するために非球面を３つのレンズ
面に採用した。Additionally, three lens surfaces are aspheric to achieve a larger aperture.

−ａに、口径が大きくなるほどコマフレアが増大しコン
トラストは低下する。コマフレアを抑えるには各入射出
面のうち、極端に屈折している面を補正するのが良い。-a, as the aperture increases, coma flare increases and contrast decreases. In order to suppress coma flare, it is best to correct the extremely refracted surface among the input and exit surfaces.

しかし球面ではどの入射出面でも同じ補正が行えないた
めコマフレアの補正には不十分である。However, with a spherical surface, the same correction cannot be made on any of the entrance and exit surfaces, so it is insufficient for correcting coma flare.

そこで、軸上から周辺に向かって連続的に屈折力を変え
る手段として非球面を用いるのである。Therefore, an aspheric surface is used as a means to continuously change the refractive power from the axis toward the periphery.

これにより大口径に於けるコマフレアを抑えることがで
きる。This makes it possible to suppress coma flare at large apertures.

請求項１のレンズのように、第４．第６．第１０レンズ
面に非球面を採用する場合、条件（１−Ｉ）を満足する
第４レンズ面の非球面形状は「長軸に回転対称な楕円面
」、条件（１−ＩＩ）を満足する第６レンズ面の非球面
形状は「短軸に回転対称な楕円面」、条件（１−ＩＩＩ
）を満足する第１０レンズ面の非球面形状は「短軸に回
転対称な楕円面」であり、条件（１−１）、（１−ＩＩ
）、（１−ＩＩＩ）を満足するとき最も小さなコマフレ
アを実現できる。Like the lens of claim 1, the fourth. 6th. When an aspherical surface is adopted as the 10th lens surface, the aspherical shape of the 4th lens surface that satisfies condition (1-I) is "an ellipsoidal surface that is rotationally symmetrical about the major axis" and satisfies condition (1-II). The aspherical shape of the sixth lens surface is "an ellipsoidal surface rotationally symmetrical about the short axis", and the condition (1-III
The aspherical shape of the tenth lens surface that satisfies the conditions (1-1) and (1-II
), (1-III), the smallest coma flare can be achieved.

請求項２のレンズのように、第３．第６．第１０レンズ
面に非球面を採用する場合１条件（２−１）を満足する
第３レンズ面の非球面形状は「短軸に回転対称な楕円面
」、条件（２−ＩＩ）を満足する第６レンズ面の非球面
形状は「短軸に回転対称な楕円面」、条件（２−ＩＩＩ
）を満足する第１０レンズ面の非球面形状はｒ長軸また
は短軸に回転対称な楕円面」であり、条件（２−Ｉ）　
、　（２−１１）、　（２−Ｉｌｌ）を満足するとき最
も小さなコマフレアを実現できる。Like the lens of claim 2, the third. 6th. When an aspherical surface is adopted as the 10th lens surface, the aspherical shape of the 3rd lens surface that satisfies condition (2-1) is "an ellipsoidal surface that is rotationally symmetrical about the minor axis" and satisfies condition (2-II). The aspherical shape of the sixth lens surface is "an ellipsoidal surface rotationally symmetrical about the short axis", and the condition (2-III
), the aspherical shape of the tenth lens surface is an ellipsoid that is rotationally symmetrical about the r major axis or the minor axis, and the condition (2-I)
, (2-11), and (2-Ill), the smallest coma flare can be achieved.

請求項３のレンズのように、第３．第７．第８レンズ面
に非球面を採用する場合５条件（３−Ｉ）を満足する第
３レンズ面の非球面形状は「短軸に回転対称な楕円面」
１条件（３−ＩＩ）を満足する第７レンズ面の非球面形
状はｒ長軸に回転対称な楕円面」、条件（３−ＩＩＩ）
を満足する第８レンズ面の非球面形状は「短軸に回転対
称な楕円面」であり、条件（３−Ｉ）　、　（３−１１
）、　（３−ＩＩＩ）を満足するとき最も小さなコマフ
レアを実現できる。Like the lens of claim 3, the third. 7th. When an aspherical surface is adopted as the 8th lens surface, the aspherical shape of the 3rd lens surface that satisfies the 5 conditions (3-I) is "an ellipsoid that is rotationally symmetrical about the minor axis"
The aspherical shape of the seventh lens surface that satisfies Condition 1 (3-II) is an ellipsoid that is rotationally symmetrical about the r long axis, Condition (3-III).
The aspherical shape of the eighth lens surface that satisfies is "an ellipsoidal surface rotationally symmetrical about the short axis", and conditions (3-I), (3-11
), (3-III), the smallest coma flare can be achieved.

請求項４のレンズのように、第３．第７．第１０レンズ
面に非球面を採用する場合１条件（４−１）を満足する
第３レンズ面の非球面形状は「短軸に回転対称な楕円面
」１条件（４−ＩＩ）を満足する第７レンズ面の非球面
形状は「長軸に回転対称な楕円面」、条件（４−Ｉｌｌ
）を満足する第１Ｏレンズ面の非球面形状は「長軸また
は短軸に回転対称な楕円面」であり、条件（４−Ｉ）、
（４−ＩＩ）、（４−ＩＩＩ）を満゛足するとき最も小
さなコマフレアを実現できる。Like the lens of claim 4, the third. 7th. When an aspherical surface is adopted as the 10th lens surface, the 1st condition (4-1) is satisfied.The aspherical shape of the 3rd lens surface is "an ellipsoid that is rotationally symmetrical about the short axis" and the 1st condition (4-II) is satisfied. The aspherical shape of the seventh lens surface is "an ellipsoidal surface rotationally symmetrical about the major axis", and the condition (4-Ill
), the aspherical shape of the first O lens surface is "an ellipsoid that is rotationally symmetrical about the major axis or the minor axis", and the condition (4-I),
The smallest coma flare can be achieved when (4-II) and (4-III) are satisfied.

請求項５のレンズのように、第３．第８．第１０レンズ
面に非球面を採用する場合、条件（５−１）を満足する
第３レンズ面の非球面形状は「短軸に回転対称な楕円面
」１条件（５−ＩＩ）を満足する第８レンズ面の非球面
形状は「短軸に回転対称な楕円面」、条件（５−ＩＩＩ
）を満足する第１０レンズ面の非球面形状はｒ長軸に回
転対称な楕円面」であり、条件（５−Ｉ）、（５−ＩＩ
）、（５−ＩＩＩ）を満足するとき最も小さなコマフレ
アを実現できる。Like the lens of claim 5, the third. 8th. When an aspherical surface is adopted as the 10th lens surface, the aspherical shape of the 3rd lens surface that satisfies condition (5-1) is "ellipsoidal surface that is rotationally symmetrical about the short axis" and satisfies condition (5-II). The aspherical shape of the eighth lens surface is "an ellipsoidal surface rotationally symmetrical about the minor axis", and the condition (5-III
The aspherical shape of the tenth lens surface that satisfies the conditions (5-I) and (5-II
), (5-III), the smallest coma flare can be achieved.

［実施例］以下、具体的な実施例を各請求項のレンズごとに３例ず
つあげる。[Example] Hereinafter, three specific examples will be given for each lens in each claim.

即ち実施例１〜３は請求項１のレンズの実施例であり、
以下順次請求項２ないし５のレンズの実施例が３例ずつ
続いている。That is, Examples 1 to 3 are examples of the lens according to claim 1,
Three embodiments of lenses according to claims 2 to 5 are successively described below.

各実施例とも、第１レンズは正のメニスカスレンズ、第
２レンズは負のメニスカスレンズ、第３レンズは負のメ
ニスカスレンズ、第４レンズは負のメニスカスレンズ、
第５レンズは両凹レンズ、第６レンズは両凸レンズであ
る。In each example, the first lens is a positive meniscus lens, the second lens is a negative meniscus lens, the third lens is a negative meniscus lens, the fourth lens is a negative meniscus lens,
The fifth lens is a biconcave lens, and the sixth lens is a biconvex lens.

各実施例に於いて、第１図に示す如く、物体側から第ｉ
番目のレンズ面の曲率半径（非球面に就いては軸上曲率
半径）をｒｉ　（ｉ＝１〜１２）、第ｉ番目のレンズ面
間隔をｄ、（ｉ＝１〜１１）、第ｊレンズの屈折率およ
びアツベ数をそれぞれ的、ｙ、（ｊ”１〜７）とする。In each embodiment, as shown in FIG.
The radius of curvature of the th lens surface (on-axis radius of curvature for aspherical surfaces) is ri (i = 1 to 12), the distance between the i th lens surfaces is d, (i = 1 to 11), the j th lens Let the refractive index and Abbe number of y and (j''1 to 7) be respectively.

またＦは全系の合成焦点距離、ＦＮＯは明るさ、２ωは
画角（度）、ｍは倍率を示す。Further, F indicates the combined focal length of the entire system, FNO indicates brightness, 2ω indicates the angle of view (degrees), and m indicates magnification.

非球面には木印を付し、軸上曲率半径の外、円錐定数と
高次の非球面係数Ａ４．Ａｓ、Ａａ、Ａ４，Ｋ６、Ｋ１
０を与えて非球面形状を特定する。The aspherical surface is marked with a wooden mark, and in addition to the axial radius of curvature, the conic constant and the higher-order aspherical coefficient A4. As, Aa, A4, K6, K1
Specify the aspherical shape by giving 0.

なお非球面係数の表示に於いて、Ｅとそれに続く数字は
１０のべき乗を示す。例えばＥ−１２とあれば、これは
１０−１２を意味し、このべき乗がＥより前にある数字
に掛かるのである。In the display of the aspheric coefficient, E and the number following it indicate a power of 10. For example, E-12 means 10-12, and the number before E is multiplied by this power.

実施例１Ｆ＝４３、ｌ１＝Ｏ０１１０２ｊｌｊ　　　　　　ｖｊ１．８１６００　４６．６２１．８４６６６　２３．８９ＦＮ０＝３．０　．２ω＝４０ｄｉ　　　　　　ｊ７．２１５　　　　１２．４５９　　　　２０．１００２．４２９　　　　３１０．１５７２．２８９　　　４１　　　　　　　　　ｒｉ１　　　　１９．２７１２　　　１０７．３５２３　　　　３７．４９１４”　　　　１３．７９０５　　　　９．９２６８”　　　　−９，９５０１，８４６６８２３，８９１，８４６６６２３，８９７−１３，４０８０，１００８−９０，２５３２，３５９５１，８４６６Ｂ　　２３
．８９９　　２２１．２２２　　５．６３１　　　６　
１．８１６００　４６．６２１０’　　−１９，９０５
２７，４７８１１ω　　　０．７００　　　７　１．５
１６３３　６４．１５１２　　　　　の非球面（第４レンズ面）Ｋ＝−０，０２０１１１，Ａ、＝−２，０２０７８Ｅ−
６，Ａ、＝−８，３１０３８６−１０Ａａ”　３．３７
７７１Ｅ−１１−Ａ４，Ｋ６、Ｋ１０＝−２，６９３２
０Ｅ−１２非球面（第６レンズ面）Ｋ＝　０．００８３７９．Ａ、＝−１，０９２８２Ｅ−
５，Ａ６＝−３，３０２３９Ｅ−８゜Ａａ＝−２，４３
１０７Ｅ−９、ＡＸ。＝　３．９３６３５Ｅ−１１非球
面（第１Ｏレンズ面）Ｋ＝　０．０００２３５．Ａ、＝　１．００１９４Ｅ−
７，Ａ、＝−２，６９８２６Ｅ−９゜Ａａ＝３．２４１
２４Ｅ−１１，Ａｌ０＝　７．３９２２０Ｅ−１４実施
例２Ｆ＝４３　　　、　ＦＮＯ”３．０．２ω”４０　　　
、ｍ＝０．１１０２ｉ　　　　ｒｉ　　　　ｄａ　　　
　ｊ　　　ｎｓ　　　ｖｓｌ　　　１８．１０８　６．
２７４　　１　１．７２９１Ｂ　　５４．８８２　　８
９．７５０　２．３１１　　２　１．７８４７２　２５
．７１３　　　４１．８７８　　０．１００４’　　　　１３．７５３　　３．０６２　　　３　１
．８４６６６　２３．８９５　　　　９．５０４　１０
．２６４６１　〜１０．７６８　　３．３９６　　　４　１．７
４０７７　２７．７９７　　　−１５．８７８　　０．
１００８　　−１０４．０５２　　１．０００　　　５
　１．６８８９３　３１．０８９　　　９１．０１３　
　６．０９２　　　６　１．７２９１６　５４．６８１
０１−１８．８３２　２７．１０４１１　　　　（１）　　　　０．７００　　　７　１．
５１６３３　６４．１５１２　　　　００非球面（第４レンズ面）Ｋ＝−０，０２７８９３，Ａ、　＝−２，４８６１３Ｅ
−６，Ａ、＝−２，３８２３６Ｅ−８゜Ａ８＝　７．３
７８６１Ｅ−１１，Ａ、ｏ＝−３，１１３９７Ｅ−１２
非球面（第６レンズ面）Ｋ２Ｏ，０３０１３４，Ａ４−２．６６７１８７Ｅ−５
，Ａ６”　１．８４４７８Ｅ−８゜Ａ８＝−４，９９５
３１Ｅ−９、Ａ、。＝　６．２１０８９Ｅ−１１非球面
（第１０レンズ面）Ｋ＝　０．０１４１２４．　Ａ４　＝−６，４２６５８
Ｅ−７，Ａ６”−３，４７７６６Ｅ−９゜Ａ８＝　１．
０４３０９Ｅ−１０，Ａｔｏ”　２．４３０８６Ｅ−１
４実施例３Ｆ”４３　　　　、Ｆｓｏ＝３．０．２ω＝４０　　　
、ｍ＝０．１１０２１　　　　　　ｒｉ　　　　　ｄｓ
　　　　　　ｊｎｊｖ　ｊｌ　　　　　１９．２７７　
　６．８８９　　　　１　１．８１６００　４６．６０
２　　　１１７．３８９　　２．０１４　　　　２　１
．７８２３５　２５．６７３　　　　３９．３９０　　
０．１００４”　　　　１５．２１７　　２．７４５　
　　　３　１．８４７００　２３．９０５　　　　１０
．２０８　１０．４００６′　　−１２，１３２２，６
１７４Ｊ、８４７００　２３．９０７　　　−１７．６
７８　　０．１００８　　　−７６．７６２　　１．２
９６　　　　５　１．７５１８１　２６．９５９　　　
　８７．４２Ｂ　　　５．４００　　　　６　１．８２
８３３　４３．９７１０’　　−１９，２６２２８，４
４８１１ｏｏ　　　　　Ｏ，７００７１，５１６３３６
４，１５１２００非球面（第４レンズ面）Ｋ＝−０，０５６６３５，Ａ４＝−４，４９７１８Ｅ−
６，Ａ６＝−２，５８６６９Ｅ−８゜Ａａ＝２．２６６
１６Ｅ−１１，ＡＩ。＝−１，８５５８１Ｅ−１２非球
面（第６レンズ面）Ｋ＝　０．０３０７８５．Ａ４＝−１，７２９５９Ｅ−
５，ＡＩ＝−９，９６９８７Ｅ−９゜Ａａ”−３，２８
８１０Ｅ−９−Ａ４，Ｋ６、Ｋ１０＝７．２６８３７Ｅ
−１１非球面（第１０レンズ面）Ｋ＝　０．００８６０
９．Ａ＜＝−２，０５６４７Ｅ−８，Ａｓ”−７，９５
１１０Ｅ−９゜Ａａ”　１．０１７０１Ｅ−１０，Ａｔ
ｏ”　２．０４９１ＺＥ−１３以上が請求項１のレンズ
の実施例である。Example 1 F=43, l1=O01102 jlj vj 1.81600 46.62 1.84666 23.89 FN0=3.0 . 2ω=40 di j 7.215 1 2.459 2 0.100 2.429 3 10.157 2.289 4 1 ri 1 19.271 2 107.352 3 37.491 4” 13.790 5 9.926 8” -9,950 1,8466823,89 1,8466623,89 7-13,4080,100 8-90,2532,35951,8466B 23
．． 899 221.222 5.631 6
1.81600 46.6210' -19,905
27,47811ω 0.700 7 1.5
1633 64.1512 aspherical surface (fourth lens surface) K=-0,020111,A,=-2,02078E-
6,A,=-8,310386-10Aa" 3.37
771E-11-A4,K6,K10=-2,6932
0E-12 aspherical surface (sixth lens surface) K= 0.008379. A, =-1,09282E-
5, A6=-3,30239E-8゜Aa=-2,43
107E-9, AX. = 3.93635E-11 aspherical surface (first O lens surface) K = 0.000235. A, = 1.00194E-
7, A, = -2,69826E-9°Aa = 3.241
24E-11, Al0=7.39220E-14 Example 2 F=43, FNO"3.0.2ω"40
, m=0.1102i ri da
j ns vsl 18.108 6.
274 1 1.7291B 54.882 8
9.750 2.311 2 1.78472 25
．． 713 41.878 0.100 4' 13.753 3.062 3 1
．． 84666 23.895 9.504 10
．． 264 61 ~10.768 3.396 4 1.7
4077 27.797 -15.878 0.
1008 -104.052 1.000 5
1.68893 31.089 91.013
6.092 6 1.72916 54.681
01-18.832 27.104 11 (1) 0.700 7 1.
51633 64.1512 00 Aspherical surface (4th lens surface) K=-0,027893,A, =-2,48613E
-6,A,=-2,38236E-8゜A8=7.3
7861E-11, A, o=-3, 11397E-12
Aspherical surface (sixth lens surface) K2O, 030134, A4-2.667187E-5
, A6” 1.84478E-8°A8=-4,995
31E-9,A. = 6.21089E-11 aspherical surface (10th lens surface) K = 0.014124. A4 = -6,42658
E-7, A6”-3, 47766E-9°A8=1.
04309E-10, Ato” 2.43086E-1
4 Example 3 F”43, Fso=3.0.2ω=40
, m=0.11021 ri ds
jnjv jl 19.277
6.889 1 1.81600 46.60
2 117.389 2.014 2 1
．． 78235 25.673 39.390
0.1004" 15.217 2.745
3 1.84700 23.905 10
．． 208 10.4006' -12,1322,6
174J, 84700 23.907 -17.6
78 0.1008 -76.762 1.2
96 5 1.75181 26.959
87.42B 5.400 6 1.82
833 43.9710' -19,26228,4
4811oo O,70071,516336
4,151200 Aspherical surface (4th lens surface) K=-0,056635, A4=-4,49718E-
6, A6=-2,58669E-8゜Aa=2.266
16E-11, AI. =-1,85581E-12 aspherical surface (sixth lens surface) K= 0.030785. A4=-1,72959E-
5, AI=-9,96987E-9゜Aa"-3,28
810E-9-A4, K6, K10=7.26837E
-11 aspherical surface (10th lens surface) K = 0.00860
9. A<=-2,05647E-8,As"-7,95
110E-9゜Aa" 1.01701E-10, At
o” 2.0491ZE-13 or more is an embodiment of the lens of claim 1.

第２図、第３図、第４図にそれぞれ実施例１〜３の収差
図を示す。FIG. 2, FIG. 3, and FIG. 4 show aberration diagrams of Examples 1 to 3, respectively.

これら第２〜第４図の収差図のみならず、以下の各実施
例の収差図に於いても、■、■、■はそれぞれｄｉ、Ｃ
線、Ｆ線に関するものであることを示す。In addition to the aberration diagrams in FIGS. 2 to 4, as well as in the aberration diagrams of each example below, ■, ■, and ■ are di and C, respectively.
Indicates that it is related to the F line.

また球面収差の図に於ける破線は正弦条件を示し、非点
収差の図に於ける実線はラジアル、破線実施例４Ｆ＝４３．Ｆ、１ｏ＝３．０，２ω＝４０９ｍ＝０．１
１Ｏ２ｉ　　　　ｒｌ　　　　ｄｉ　　　　ｊ　　　ｎ
ｓ　　　ｖｊｌ　　　１９．４９７　７．２６３　　１
　１．８１６００　４６．６２２　　１１０．４６７　
２．６０６　　２　１．８４６６６　２３．８９３’　
　　３９．５７０　０．１００４　　１４．５５９　２．６３４　　３　１．８４６６
６　２３．８９５　　１０．２０４　１０．０４２６’　　−１０，２９２２，４８８４１，８４６６６２
３，８９７−１４，３０１０，１００８−１０１，５７６２，５０４５１，８４６６６２３，
８９９１８８，８０４５，７４３６１，８１６００４６
，６２１０”　　−１９，７７０２７，２０６１１０）
　　　０．７００　　７　１．５１６３３　６４．１５
１２　　　００非球面（第３レンズ面）に”　０．６３２９６９．Ａ４＝　１．９０１７２Ｅ−
６，ＡＳ”−９，７５０８８Ｅ−９゜Ａａ”−５，２８
７６４Ｅ−１１，Ａｔｏ”　７．２６５９８Ｅ−１３非
球面（第６レンズ面）Ｋ２Ｏ，０１７７１８，Ａ４”−１，６２０１９Ｅ−５
，Ａｓ”−４，３０４８５Ｅ−８゜Ａ、＝−４，４７５
８６Ｅ−９、Ａ、、＝　５．４９１１４Ｅ−１１非球面
（第１０レンズ面）Ｋ＝　０．００４２３５．Ａ４＝　１．６４２８９Ｅ−
７，Ａ、＝−６，０５１００Ｅ−９゜Ａａ”　５．５４
２５７Ｅ−１１，Ａ１゜＝　８．０１８４６Ｅ−１４実
施例５Ｆ＝４３　　　、　ＦＮＯ＝３．０．２ω：４０　　　
、ｍ＝０．１１０２ｉ　　　　ｒ＋　　　　ｄｔ　　　
　ｊｎｊｌ　　　１８．５４８　６．５２６　　１　１
．７２９１６　５４．６８２　　９６．６３６　２．７
８３　　２　１．７８４７２　２５．７１３”　　　４
２．９９３　０．１００４　　１４．５８５　３．１３６　　３　１．８４６６
６　２３．８９５　　１０．０７１　１０．０７０６’　　　−９，７９２３，１１８４１，７４０７７２
７，７９７−１４，０７１０，１００８−１１６，４８９１，０００５１，６８８９３３１．
０６９７４，５３９６，２３１６１，７２９１６５４，
６８１Ｏ″　−１９，１８５２６，６８３１１（Ｘ）　　　０．７００　　７　１．５１６３３　
６４．１５１２　　　　（Ｋ）非球面（第３レンズ面）Ｋ＝　０．９４６３２４．Ａ、＝　２．２２９６１Ｅ−
６，Ａ６＝−７，８７８１５Ｅ−９゜Ａ、＝−５，６０
２１１Ｅ−１１，Ａ、。＝　６．５５５４９Ｅ−１３非
球面（第６レンズ面））ｕ　Ｏ，０１５５４１，Ａ４”−２，１１４１９Ｅ−
５，Ａｓ”−１，９２８６７Ｅ−８゜Ａ、＝−５，３５
６７５Ｅ−９＋ＡＩ。＝　４．３２０８２Ｅ−１１非球
面（第１０レンズ面）Ｋ：０．００２４５１．Ａ４＝５．０７３０３Ｅ−８，
Ａｓニー３．９１１８４Ｅ−９゜Ａａ＝　７．８５４１
２Ｅ−１１，ＡＩ。＝　４．０４０７１Ｅ−１４実施例
６Ｆ：４３　　　、　ＦＮＯ”３．０．２ω”４０　　　
、ｍ”０．１１０２ｉ　　　　ｒｌ　　　　ｄム　　　
ｊ　　　ｎｊｌ　　　１９．１２５　７．１０２　　１
　１．８１６００　４６．６０２　　１１９．３２６　
２．２４８　　２　１．８３５６２　２４．１９３２　
３５．４１１　０−１７２４　　１３．５４５　２．：１７４　　３　１．８４７
００　２３．９０５　　　　Ｌ９３９　１０．０９５６”　　　−９，３６２１，９７５４１，８４７００２
３，９０７−１２，２５９０，３５７８−８６，５５７２，３１５５１，８２２４１２４，５
６９１２７，８３６５，６３２６１，８２０２６４５，
６５１０’　　−２０，３２４２７，４５９１１ｏｏ　
　　　Ｏ，７００７１，５１６３３６４，１５１２ｃＩ
ｌ）非球面（第３レンズ面）Ｋ”　０．１５３９４６．Ａ４：５．５７０９８Ｅ−７
，Ａｓ”−４，１４１３８Ｅ−９゜Ａ、＝−２，８８５
０１Ｅ−１１、Ａ□。、　４．３７５５０Ｅ−１３非球
面（第６レンズ面）Ｋ”　０．００４２２６．Ａ４＝−６，５０８５５Ｅ−
６，Ａｓ”−９，１１６６５Ｅ−９゜Ａ、＝−１，１１
１９５Ｅ−９、Ａ□。＝　５．５７７２３Ｅ−１２非球
面（第１０レンズ面）Ｋ＝−０，００５６３５，Ａ＜＝２．７６９７７Ｅ−７
，Ａｓ”−１，３８０８８Ｅ−９゜Ａａ”　１．０００
６３Ｅ−１１，ＡＩ。＝　３．９４８５７Ｅ−１４以上
が請求項２のレンズの実施例である。Further, the broken line in the diagram of spherical aberration indicates the sine condition, the solid line in the diagram of astigmatism indicates the radial condition, and the dashed line indicates Example 4 F=43. F, 1o=3.0, 2ω=409m=0.1
1O2i rl di j n
s vjl 19.497 7.263 1
1.81600 46.622 110.467
2.606 2 1.84666 23.893'
39.570 0.100 4 14.559 2.634 3 1.8466
6 23.895 10.204 10.042 6' -10,2922,48841,846662
3,897-14,3010,100 8-101,5762,50451,8466623,
899188, 8045, 74361, 8160046
,6210"-19,77027,206110)
0.700 7 1.51633 64.15
12 00 Aspherical surface (third lens surface) 0.632969.A4= 1.90172E-
6,AS"-9,75088E-9゜Aa"-5,28
764E-11, Ato” 7.26598E-13 Aspherical surface (6th lens surface) K2O, 017718, A4”-1, 62019E-5
, As”-4,30485E-8°A, =-4,475
86E-9, A, , = 5.49114E-11 Aspherical surface (10th lens surface) K = 0.004235. A4= 1.64289E-
7,A,=-6,05100E-9゜Aa" 5.54
257E-11, A1゜=8.01846E-14 Example 5 F=43, FNO=3.0.2ω:40
, m=0.1102i r+dt
jnjl 18.548 6.526 1 1
．． 72916 54.682 96.636 2.7
83 2 1.78472 25.713" 4
2.993 0.100 4 14.585 3.136 3 1.8466
6 23.895 10.071 10.070 6' -9,7923,11841,740772
7,797-14,0710,100 8-116,4891,00051,6889331.
06974,5396,23161,7291654,
681O″ -19,18526,683 11(X) 0.700 7 1.51633
64.1512 (K) Aspherical surface (third lens surface) K = 0.946324. A, = 2.22961E-
6, A6=-7,87815E-9°A,=-5,60
211E-11,A. = 6.55549E-13 Aspherical surface (6th lens surface) ) u O, 015541, A4”-2, 11419E-
5, As”-1,92867E-8°A, =-5,35
675E-9+AI. = 4.32082E-11 aspherical surface (10th lens surface) K: 0.002451. A4=5.07303E-8,
As knee 3.91184E-9゜Aa=7.8541
2E-11, AI. = 4.04071E-14 Example 6 F: 43, FNO”3.0.2ω”40
, m”0.1102i rl dm
j njl 19.125 7.102 1
1.81600 46.602 119.326
2.248 2 1.83562 24.1932
35.411 0-172 4 13.545 2. :174 3 1.847
00 23.905 L939 10.095 6” -9,3621,97541,847002
3,907-12,2590,357 8-86,5572,31551,8224124,5
69127, 8365, 63261, 8202645,
6510'-20,32427,45911oo
O,70071,5163364,1512cI
l) Aspherical surface (third lens surface) K” 0.153946.A4:5.57098E-7
, As”-4,14138E-9°A, =-2,885
01E-11, A□. , 4.37550E-13 Aspherical surface (sixth lens surface) K" 0.004226.A4=-6,50855E-
6, As”-9,11665E-9°A, =-1,11
195E-9, A□. = 5.57723E-12 Aspherical surface (10th lens surface) K=-0,005635, A<=2.76977E-7
, As”-1,38088E-9゜Aa” 1.000
63E-11, AI. = 3.94857E-14 or more is an embodiment of the lens of claim 2.

第５図、第６図、第７図にそれぞれ実施例４〜６の収差
図を示す。Aberration diagrams of Examples 4 to 6 are shown in FIGS. 5, 6, and 7, respectively.

実施例７Ｆ＝４３　　　、　Ｆｓｏ”３．０．２ω＝４０　　　
、ｍ＝ｏ、１１０２ｉ　　　　ｒｉ　　　　ｄｔ　　　
　ｊ　　　ｎｓ　　　ｖｊｌ　　　１９．６６Ｂ　　７
．２９０　　１　１．８１６００　４Ｂ、６２２　　１
１５．７３０　２．６６７　　２　１．８４６６８　２
３．８９３”　　　　４０．４０７　　０．１００４　
　　　１４．７１５　　２．６５９　　　　３　１．８
４６６６　２３．８９５　　　　１０．２８１　１０．
０５２６　　　−１０．０８０　　２，４７５　　　　
４　１．８４６８６　２３．８９７’　　　−１４，０
２９０，１００８”　　−１１５，８５４２，２８２５１，８４８Ｂ８
　２３．８９９　　　１７７．２９２　　５．６１６　
　　６　１．８１８００　４６．６２１０　　−２０．
０３２　２７．２１７１１　　　　　ｃ６　　　　０．
７００　　　７　１．５１６３３　６４．１５１２　　
　　　の非球面（第３レンズ面）Ｋ＝　０．７０６４４０．Ａ、＝　２．０４８５５Ｅ−
６，Ａ、＝−８，４６４２２Ｅ−９゜Ａａ”−６−９２
５２９Ｅ−１１＊Ａ＋。、　８．０２９７９Ｅ−１３非
球面（第７レンズ面）Ｋ＝−０，０２３３８９，Ａ、＝　８．３８７５６Ｅ−
６，Ａｓ＝−５，０１６６９Ｅ−８゜ＡＭ＝　２．９６
１５４Ｅ−１０，ＡＩ。＝−２，８０３８８Ｅ−１２非
球面（第８レンズ面）に＝２．アＡ’１３７’ｒ　　、Ａ４＝−４，５１５０
４Ｅ−７，Ａｇ＝−１，４８０３７Ｅ−８゜＾、＝−１
．３０２９４Ｅ−１０．Ａ、、＝　１．０３０３０Ｅ−
１２実施例８Ｆ＝４３　　　　　　、　　ＦＮＯ”３．０　．２ω＝
４０　　　　　、ｍ＝０．１１０２ｉ　　　　　　　　
　ｒｌ　　　　　　　　ｄｉ　　　　　　　　　ｊ　　
　　　　ｎｊｖＪｌ　　　　　１８．４８４　　６．５
１７　　　　１　１．７２９１６　５４．６８２　　　
　９５．２８４　　２．７１７　　　　２　１．７８４
７２　２５．７１３零　　　４１．６１４　　０．１０
０４　　　　１４．１９５　　２．９７２　　　　３　
１．８４６６６　２３．８９５　　　　　９．９７８　
１０．１２３６　　　　−９．４１８　　　Ｌ９１５　
　　　４　１．７４０７７　２７．７９７”　　−１３
，２８９０，１００８本　−１３２，８６４１，０００５１，６８８９３３
１．０６９７３，４６３５，９９０６１，７２９１６５
４，６８１０−１９，７４９２６，８８５１１ω　　　　０．７００　　　　７　１．５１６３３
　６４．１５１２ｃ１：Ｉ非球面（第３レンズ面）Ｋ＝　０．７９４５２８．Ａ、＝　１．８９０６６Ｅ−
６，Ａ６＝−５，５３５６４Ｅ−９゜Ａａミニ−，５７
８７３Ｅ−１１，Ａｔｏ”　６．８３４１８Ｅ−１３非
球面（第７レンズ面）Ｋ”−０，０１２５１５，Ａ４＝７．０７６２５Ｅ−６
，Ａｓ”−５，５０７５５Ｅ−８゜Ａａ＝　１．２７５
３４Ｅ−１０，Ａ、。＝　２．５５７２９Ｅ−１４非球
面（第８レンズ面）Ｋ＝　９．１９１３４３．Ａ、＝−９，９３７０７Ｅ−
７，Ａ、＝−１，３７０３５Ｅ−８゜Ａａ＝−９，４３
０２２Ｅ−１１，Ａ４，Ｋ６、Ｋ１０、　８．２３２４
０Ｅ−１３実施例９Ｆ＝４３．ＦＮｏ：３．０，２ω：４０２ｍ＝０．１１
０２ｉ　　　　ｒｉ　　　　ｄ＋　　　　ｊｎｊＶ　Ｊ
ｌ　　　１９．０８２　７．０５６　　１　１．８１６
００　４８．６０２　　１１８．３５５　２．１７３　
　２　１．８４１７２　２４．０３３’　　　３４．８
３８　０．３７４４　　１３．２７９　２．３２６　　３　１．８４７０
０　２３．９０５　　　９．８６０　１０．２０３６　　−８．８９３　１．９０５　　４　１．８４７０
０　２３．９０７″　−１１，４３９０，４３０８本　−８５，６７５２，２５３５１，８３３９６２４
，２４９１３９，１４９５，６０１６１，８１８２９４
６．０６１０−２０，４１１２１２４９１１（Ｘ）　　　０．７００　　７　１．５１６３３　
６４．１５１２　　　　の非球面（第３レンズ面）Ｋ＝　０．０５９２２３．Ａ、＝　２．２５２４６Ｅ−
７，Ａ、＝−２，０９９８８Ｅ−９゜Ａｓ”−１，１７
９９７Ｅ−１１，Ａｘｏ”　　２．１８９１７Ｅ−１３
非球面（第７レンズ面）Ｋ＝−０，００３５８５，Ａ４＝　２．３２１０７Ｅ−
８，Ａｓ＝−９，７５３３３Ｅ−９゜Ａａ＝　２，７３
６７５Ｅ１１．Ａ４，Ｋ６、Ｋ１０＝　１．２１２８７
Ｅ−１２非球面（第８レンズ面）Ｋ＝　０．６２８７３９．Ａ、＝−１，２８３１１Ｅ−
７，Ａ５＝−９，７５０４５Ｅ−１０Ａａ”−１，１８
４４８Ｅ−１１，Ａ４，Ｋ６、Ｋ１０＝　１．０７０６
０Ｅ−１３以上が請求項３のレンズの実施例である。Example 7 F=43, Fso”3.0.2ω=40
, m=o, 1102i ri dt
j ns vjl 19.66B 7
．． 290 1 1.81600 4B, 622 1
15.730 2.667 2 1.84668 2
3.893" 40.407 0.1004
14.715 2.659 3 1.8
4666 23.895 10.281 10.
0526 -10.080 2,475
4 1.84686 23.897' -14,0
290,100 8”-115,8542,28251,848B8
23.899 177.292 5.616
6 1.81800 46.6210 -20.
032 27.21711 c6 0.
700 7 1.51633 64.1512
Aspherical surface (third lens surface) K= 0.706440. A, = 2.04855E-
6,A,=-8,46422E-9゜Aa''-6-92
529E-11*A+. , 8.02979E-13 Aspherical surface (7th lens surface) K=-0,023389,A,=8.38756E-
6, As=-5,01669E-8゜AM=2.96
154E-10, AI. =-2, 80388E-12 aspherical surface (eighth lens surface) =2. A'137'r, A4=-4,5150
4E-7,Ag=-1,48037E-8゜＾,=-1
．． 30294E-10. A,, = 1.03030E-
12 Example 8 F=43, FNO”3.0.2ω=
40, m=0.1102i
rl di j
njvJl 18.484 6.5
17 1 1.72916 54.682
95.284 2.717 2 1.784
72 25.713 zero 41.614 0.10
04 14.195 2.972 3
1.84666 23.895 9.978
10.1236 -9.418 L915
4 1.74077 27.797" -13
,2890,100 8 pieces -132,8641,00051,688933
1.06973,4635,99061,729165
4,6810-19,74926,885 11ω 0.700 7 1.51633
64.1512c1:I Aspherical surface (third lens surface) K= 0.794528. A, = 1.89066E-
6, A6=-5,53564E-9゜Aa mini-,57
873E-11, Ato” 6.83418E-13 Aspherical surface (7th lens surface) K”-0,012515, A4=7.07625E-6
, As”-5,50755E-8゜Aa= 1.275
34E-10,A. = 2.55729E-14 aspherical surface (8th lens surface) K = 9.191343. A, =-9,93707E-
7,A,=-1,37035E-8゜Aa=-9,43
022E-11, A4, K6, K10, 8.2324
0E-13 Example 9 F=43. FNo: 3.0, 2ω: 402m=0.11
02i rid+ jnjV J
l 19.082 7.056 1 1.816
00 48.602 118.355 2.173
2 1.84172 24.033' 34.8
38 0.374 4 13.279 2.326 3 1.8470
0 23.905 9.860 10.203 6 -8.893 1.905 4 1.8470
0 23.907″ -11,4390,430 8 pieces -85,6752,25351,8339624
,249139,1495,60161,818294
6.0610-20,41121249 11(X) 0.700 7 1.51633
64.1512 aspherical surface (third lens surface) K=0.059223. A, = 2.25246E-
7,A,=-2,09988E-9°As”-1,17
997E-11, Axo” 2.18917E-13
Aspherical surface (7th lens surface) K=-0,003585, A4=2.32107E-
8, As=-9,75333E-9°Aa=2,73
675E11. A4, K6, K10 = 1.21287
E-12 aspherical surface (8th lens surface) K = 0.628739. A, =-1,28311E-
7, A5=-9,75045E-10Aa"-1,18
448E-11, A4, K6, K10 = 1.0706
0E-13 or higher is an embodiment of the lens according to claim 3.

第８図、第９図、第１Ｏ図にそれぞれ実施例７〜９の収
差図を示す。Aberration diagrams of Examples 7 to 9 are shown in FIGS. 8, 9, and 10, respectively.

実施例１ＯＦ＝４３　　　、Ｆ、。＝３．０．２ω：４０．ｆｆ１
＝０．１１０２ｉ　　　　ｒｌ　　　　ｄｌ　　　　ｊ
　　　ｎｊｖｉｌ　　　１９．６５８　７．１８４　　
１　１．８１６００　４６．６２２　　１１３．３２２
　２．５６９　　２　１．８４６６６　２３．８９３”
　　　４０．９２２　０．１００４　　１４．７９４　２．７４５　　３　１．８４６６
６　２３．８９５　　１０．２６４　１０．１９７６　　−１０．３７７　２．６３１　　４　１．８４６
６６　２３．８９７ｔ′−１４，７１４０，１００８−１２２，５３９２，４２３５１，８４６８８２３，
８９９１６２，３０４５，８８１６１，８１６００４６
，６２１０本　　−１９，９７１２７，２２５１１（Ｘ
）　　　　　０．７００　　　７　１．５１６３３　６
４．１５１２　　　　　００非球面（第３レンズ面）Ｋ２Ｏ，７３１３５２，Ａ４”　２．１１０９８Ｅ−６
，Ａｓ”−９，２２８１５Ｅ−９Ａａ”−４，３９１４
４Ｅ−１１，Ａ４，Ｋ６、Ｋ１０＝　５．７１２４２Ｅ
−１３非球面（第７レンズ面）Ｋ”−０，０３９７４８，Ａ４：１．０１１６７Ｅ−５
，Ａｓ”−１，１７１１４Ｅ−８゜Ａａ”　９．９３９
００Ｅ−１０−Ａ４，Ｋ６、Ｋ１０、−１，０９９１４
Ｅ−１１非球面（第１０レンズ面）に＝　０．００６２
６４．Ａ４＝　１．２４５４０Ｅ−７，ＡＩ＝−７，２
４０６４Ｅ−９゜Ａａ：　７．４２２０１Ｅ−１１，Ａ
ｘ。＝　１．２７６８８Ｅ−１３実施例１１Ｆ：４３　　　、　ＦＨｏ”３．０．２ω＝４０．ｌ１
１＝〇、１１０２ｉ　　　　ｒｉ　　　　ｃｔｌ　　　
　ｊ　　　ｎｊｌ　　　１８．５９８　　Ｂ、４２８　
　１　１，７２９１６　５４．８８２　　９９．１５６
　２．６８８　　２　１．７８４７２　２５．７１３”
　　　４４．５４３　０．１００４　　　　１４．８３８　　３．２７０　　　３　１．
８４６８６　２３．８９５　　　　１０．１２６　１０
．２３４６　　　−９．７７９　　３．２２７　　　４
　１．７４０７７　２７．７９７番　　−１４，３４４
０，１００８−１５７，０３８１，０００５１，６８８９３３１．
０６９６９，４７７６，３６０６１，７２９１６５４，
８８１０’　　−１９，４８６２６，４８９１１■　　
　　０．７００　　　　７　１．５１６３３　６４．１
５１２　　　　　　Ｃ０非球面（第３レンズ面）１（＝　１．０７０７７７、Ａ４”　２．４４８０４Ｅ
−６，Ａｓ”−６，９９１４４Ｅ−９Ａｓ＝−４，８４
５３１Ｅ−１１，Ａ４，Ｋ６、Ｋ１０＝　５．０９８６
７Ｅ−１３非球面（第７レンズ面）Ｋ”−０，０３４１８８−Ａ４”　１．１８６０８Ｅ−
５，Ａｓ２−３．０５９６４Ｅ−８゜Ａｓ”　８．４８
０６５Ｅ−１０，Ａｘ。ニー７．１５９０５Ｅ−１２非
球面（第１０レンズ面）Ｋ”　０．０００９９７．Ａ４ニー９．０８４９１Ｅ−
８，Ａｓ”−１，７８４２６Ｅ−９゜Ａａ＝１．０７２
２２Ｅ−１０，Ａ１゜＝　６．８４０６３Ｅ−１５実施
例１２Ｆ＝４３　　　、Ｆ、、＝３．０，２ω＝４０，１ｌ＝
０．１１０２ｉ　　　　　　ｒｚ　　　　　ｄｉ　　　
　　　ｊ　　　　ｎｊｖＪｌ　　　　１９．１４３　　
７．０９８　　　１　１．８１８００　４８．６０２　
　１１９．５６６　　２．２４７　　　２　１．８３４
９７　２４．２１３寧　　　　３５．４８４　　　０．
１３６４　　　１３．８０７　　２．３８９　　　３　
１．８４７００　２３．９０５　　　　９．９７５　１
０．１１３６　　　−９．３２６　　１．９６？　　　　４　１．
８４７００　２３．９０７”　　　−１２，２２６０，
３３４８−８８，７２９２，３０３５１，８２２２０２４，５
Ｂ９　　　１２６．３６７　　５．６２１　　　６　１
．８２０３２　４５．６３１０”　　−２０，３８１２
７，５００１１０００，７００７１，５１６３３６４，
１５１２（Ｘ）非球面（第３レンズ面）Ｋ”　０．１６２１６Ｂ、Ａ４”　５．８５９４７Ｅ−
７，Ａｓ”−４，３２１３３２−９゜Ａ、＝−２，９８
６７５Ｅ−１１，Ａ、。＝４．５４７５７Ｅ−１３非球
面（第７レンズ面）Ｋ”−０，００７３０９，Ａ＊＝３．７９０９７Ｅ−６
，Ａｓ”−３，８７６５５Ｅ−９゜Ａａ＝２．２６８８
４Ｅ−１０，Ａ４，Ｋ６、Ｋ１０＝−１，７２８０５８
−１２非球面（第１０レンズ面）Ｋ”−０，００５６４
１−Ａ４”　２．５１０７１Ｅ−７，Ａｓ”−１，０４
４０２Ｅ−９゜Ａｓ”　１．２３３０４Ｅ−１１，Ａ、
。＝　２．９９２５３Ｅ−１４以上が請求項４のレンズ
の実施例である。Example 1O F=43,F. =3.0.2ω:40. ff1
=0.1102i rl dl j
njvil 19.658 7.184
1 1.81600 46.622 113.322
2.569 2 1.84666 23.893”
40.922 0.100 4 14.794 2.745 3 1.8466
6 23.895 10.264 10.197 6 -10.377 2.631 4 1.846
66 23.897t'-14,7140,100 8-122,5392,42351,8468823,
899162, 3045, 88161, 8160046
,6210 -19,97127,22511(X
) 0.700 7 1.51633 6
4.1512 00 Aspherical surface (third lens surface) K2O, 731352, A4” 2.11098E-6
, As”-9,22815E-9Aa”-4,3914
4E-11, A4, K6, K10 = 5.71242E
-13 Aspherical surface (7th lens surface) K”-0,039748, A4:1.01167E-5
,As”-1,17114E-8゜Aa” 9.939
00E-10-A4,K6,K10,-1,09914
E-11 aspherical surface (10th lens surface) = 0.0062
64. A4=1.24540E-7, AI=-7,2
4064E-9゜Aa: 7.42201E-11,A
x. = 1.27688E-13 Example 11 F:43, FHo”3.0.2ω=40.l1
1=○, 1102i ri ctl
j njl 18.598 B, 428
1 1,72916 54.882 99.156
2.688 2 1.78472 25.713”
44.543 0.100 4 14.838 3.270 3 1.
84686 23.895 10.126 10
．． 2346 -9.779 3.227 4
1.74077 27.797 -14,344
0,100 8-157,0381,00051,6889331.
06969,4776,36061,7291654,
8810'-19,48626,48911■
0.700 7 1.51633 64.1
512 C0 Aspherical surface (third lens surface) 1 (= 1.070777, A4” 2.44804E
-6,As”-6,99144E-9As=-4,84
531E-11, A4, K6, K10 = 5.0986
7E-13 Aspherical surface (7th lens surface) K"-0,034188-A4" 1.18608E-
5, As2-3.05964E-8゜As” 8.48
065E-10, Ax. Knee 7.15905E-12 Aspherical surface (10th lens surface) K” 0.000997.A4 Knee 9.08491E-
8, As”-1,78426E-9゜Aa=1.072
22E-10, A1゜= 6.84063E-15 Example 12 F=43, F,,=3.0,2ω=40,1l=
0.1102i rz di
j njvJl 19.143
7.098 1 1.81800 48.602
119.566 2.247 2 1.834
97 24.213 ning 35.484 0.
1364 13.807 2.389 3
1.84700 23.905 9.975 1
0.113 6 -9.326 1.96? 4 1.
84700 23.907" -12,2260,
334 8-88, 7292, 30351, 8222024, 5
B9 126.367 5.621 6 1
．． 82032 45.6310" -20,3812
7,50011000,70071,5163364,
1512(X) Aspherical surface (third lens surface) K" 0.16216B, A4" 5.85947E-
7, As”-4,321332-9°A, =-2,98
675E-11,A. =4.54757E-13 Aspherical surface (7th lens surface) K”-0,007309, A*=3.79097E-6
, As”-3,87655E-9°Aa=2.2688
4E-10, A4, K6, K10=-1,728058
-12 aspherical surface (10th lens surface) K”-0,00564
1-A4” 2.51071E-7,As”-1,04
402E-9゜As” 1.23304E-11,A,
. =2.99253E-14 or more is an embodiment of the lens according to claim 4.

第１１図、第１２図、第１３図にそれぞれ実施例１０〜
１２の収差図を示す。Examples 10 to 10 are shown in FIG. 11, FIG. 12, and FIG. 13, respectively.
12 is shown.

実施例１３Ｆ”４３　　　、　ＦＮＯ”３．０．２ω”４０　　　
、ｍ＝０．１１０２ｉ　　　　　　　　　ｒｉ　　　　
　　　　ｄｉ　　　　　　　　ｊ　　　　　　ｎｓ　　
　　　　　ツ　ｊｌ　　　１９．４Ｂ１　７．２４９　
　１　１．８１８００　４６．６２２　　１０８．６６
５　２．５７１　　２　１．８４８６６　２３．８９３
”　　　３８．７１１　０．１００４　　　Ｌ４．６２５　２．５４１　　３　１．８４６
８６　２３．８９５　　１０．３３８　１０．１５２６　　−９．４１９　２．１９３　　４　１．８４６６
６　２３．８９７　　−１２．５４７　０．１００８”　　−１０６，１６２２，３２０５１，８４６６６
２３，８９９１６２，３０１５，５５１６１，８１６０
０４６，６２１０’　　−２０，４１６２７，３（１９
１１ω　　０，７００　　　・７　１．５１８３３　６
４．１５１２　　　　ω 非球面（第３レンズ面）Ｋ”　０．５７８３１５．Ａ４”　１．７９１０６Ｅ−
８−Ａｓニー９．０２６２９Ｅ−９Ａ、＝−６，９００
４８Ｅ（１，Ａｘ。＝　９．４０９９５Ｅ−１３非球面
（第８レンズ面）Ｋ”　８．４１１５５５．Ａｔ”−１，４５２８７Ｅ−
６，Ａｓ”　１．０７１３４Ｅ−９−＾ａ”１．２９９
９４Ｅ−１１−Ａｔｏ＝７．５７５４３Ｅ−１３非球面
（第１０レンズ面）Ｋニー０．０２０４１５．Ａ４”　１．４８４１５Ｅ−
６，Ａｓ２−１．１８８２６Ｅ−８゜Ａａ＝　１．４８
６１０Ｅ−１２，Ａ、。、　３．２２４２５Ｅ−１３実
施例１４Ｆ＝４３　　　、Ｆ、。＝３．０．２ω＝４０　　　、
＋＋＝０．１１０２ｉ　　　　ｒｉ　　　ｄｉ　　　ｊ
　　ｎｊ　　ヤｊ１　　１８．４９１　６．４８２　　
１　１．７２９１Ｂ　　５４．６８２　　９５．０８７
　２．６９６　　２　１．７８４７２　２５．７１３”
　　　４０．７９９　０．１００４　　１４．３２１　２．９６８　　３　１．８４８６
８　２３．８９５　　１０．１２４　１０．２２４８　　−９．０２８　２．７３０　　４　１．７４０７
７　２７．７９７　　−１２．３９３　０．１００８”　　−１２８，７１８１，０００５１，６８８９３
３１１．０６９　　　　６８．４３３　　５．８４２　
　　　６　１．７２９１６　５４．６８１０”　　−２
０，１１８２６，８９１１１■　　　　０．７００　　
　　７　１．５１６３３　６４．１５１２　　　　　の非球面（第３レンズ面）Ｋ＝　０．７１４０６２．Ａ、＝　１．７８４８５Ｅ−
６，Ａｓ：＝−７，３４０９７Ｅ−９Ａａ”−６，６２
９１２Ｅ−１１，、Ａ＋ｏ”　８．５２２４３Ｅ−１３
非球面（第８レンズ面）Ｋ”１２．７９５６１４．Ａ４”−１，５０６０７Ｅ−
６，ＡＩ”　１．７０４２６Ｅ−９゜Ａ８＝−７，７１
８８５Ｅ−１２，Ａ　＋。＝　４．９３７９２Ｅ−１３
非球面（第１Ｏレンズ面）Ｋ＝−０，０１９６７４，Ａ、＝　１．３７２７３Ｅ−
６，Ａ６＝−１，０１８７６Ｅ−８゜Ａ、＝　６．４３
５９６Ｅ−１２，Ａ、、＝　３．１２５１９Ｅ−１３実
施例１５Ｆ：４３．Ｆ、１゜＝３．０．２ω＝４０　　　、ｎ＋
＝０．１１０２ｉ　　　　ｒｒ　　　　ｄ＋　　　　ｊ
　　　ｎｊ’Ｉ　Ｊｌ　　　１９．０８１　７．０４２
　　１　１．８１６００　４６．６０２　　１１６．０
１５　２．１５５　　２　１．８４３１９　２ＣＯＯ３
’　　　３４．７２４　０．４０４４　　１３．３５１　２．３２１　　３　１．８４７０
０　２３．９０５　　　　９．９１８　１０．２６２６　　　−８．７１０　　１．８８５　　　４　１．８
４５１８　２３．９５７　　　−１１．１３８　　０．
４１０８’　　　−８６，７１６２，２１９５１，８３
８０１２４，１３９１３４，７３２５，５６６６１，８
１７８７４６，１８１０’　　−２０，５０５２７，２
８８１１ｏｏ　　　　　Ｏ，７００７１，５１６３３６
４，１５１２ω 非球面（第３レンズ面）Ｋ”　０．０５７７５４．Ａ４”　２．２０４７６Ｅ−
７，Ａｓ＝−２，１８３５７Ｅ−９゜Ａａ＝−１，２４
３９７Ｅ−１１，Ａ＋ｏ”　２．３０４０５Ｅ−１３非
球面（第８レンズ面）Ｋ＝　０．９４９６２８．Ａ、＝−１，９７３６４Ｅ−
７，ＡＳ＝　５．１９７５０Ｅ−１０Ａｓ”−５−５８
１１５Ｅ−１３ｙＡ４，Ｋ６、Ｋ１０＝　５．２５７３
０Ｅ−１４非球面（第１０レンズ面）Ｋ＝−０，００６
２９１，Ａ、＝　３．１９１８６Ｅ−７，Ａ６＝−１，
２３０１３Ｅ−９゜Ａａミニ−，４３４８１Ｅ−１２，
ＡＨ０＝　１．６８５５２Ｅ−１４以上が請求項５のレ
ンズの実施例である。Example 13 F”43, FNO”3.0.2ω”40
, m=0.1102i ri
di j ns
Tsu jl 19.4B1 7.249
1 1.81800 46.622 108.66
5 2.571 2 1.84866 23.893
” 38.711 0.100 4 L4.625 2.541 3 1.846
86 23.895 10.338 10.152 6 -9.419 2.193 4 1.8466
6 23.897 -12.547 0.100 8" -106,1622,32051,84666
23,899162,3015,55161,8160
046,6210'-20,41627,3(19
11ω 0,700 ・7 1.51833 6
4.1512 ω Aspherical surface (third lens surface) K"0.578315.A4" 1.79106E-
8-As knee 9.02629E-9A, = -6,900
48E (1, Ax. = 9.40995E-13 Aspherical surface (8th lens surface) K” 8.411555.At”-1,45287E-
6, As” 1.07134E-9-^a”1.299
94E-11-Ato=7.57543E-13 Aspherical surface (10th lens surface) K knee 0.020415. A4” 1.48415E-
6, As2-1.18826E-8゜Aa=1.48
610E-12,A. , 3.22425E-13 Example 14 F=43 ,F. =3.0.2ω=40,
++=0.1102i ri di j
nj yaj1 18.491 6.482
1 1.7291B 54.682 95.087
2.696 2 1.78472 25.713”
40.799 0.100 4 14.321 2.968 3 1.8486
8 23.895 10.124 10.224 8 -9.028 2.730 4 1.7407
7 27.797 -12.393 0.100 8" -128,7181,00051,68893
311.069 68.433 5.842
6 1.72916 54.6810" -2
0,11826,89111■ 0.700
7 1.51633 64.1512 Aspherical surface (third lens surface) K= 0.714062. A, = 1.78485E-
6, As:=-7,34097E-9Aa"-6,62
912E-11,, A+o" 8.52243E-13
Aspherical surface (8th lens surface) K”12.795614.A4”-1,50607E-
6, AI” 1.70426E-9°A8=-7,71
885E-12, A+. = 4.93792E-13
Aspherical surface (first O lens surface) K=-0,019674,A,=1.37273E-
6, A6=-1,01876E-8°A, = 6.43
596E-12,A,,=3.12519E-13 Example 15 F:43. F, 1゜=3.0.2ω=40, n+
=0.1102i rr d+j
nj'I Jl 19.081 7.042
1 1.81600 46.602 116.0
15 2.155 2 1.84319 2COO3
' 34.724 0.404 4 13.351 2.321 3 1.8470
0 23.905 9.918 10.262 6 -8.710 1.885 4 1.8
4518 23.957 -11.138 0.
4108'-86,7162,21951,83
80124, 139134, 7325, 56661, 8
178746,1810'-20,50527,2
8811oo O,70071,516336
4,1512ω Aspherical surface (third lens surface) K"0.057754.A4" 2.20476E-
7, As=-2,18357E-9゜Aa=-1,24
397E-11, A+o" 2.30405E-13 Aspherical surface (8th lens surface) K= 0.949628.A, = -1,97364E-
7, AS= 5.19750E-10As”-5-58
115E-13yA4,K6,K10=5.2573
0E-14 Aspherical surface (10th lens surface) K=-0,006
291,A,=3.19186E-7,A6=-1,
23013E-9゜Aa mini-, 43481E-12,
AH0=1.68552E-14 or more is an embodiment of the lens according to claim 5.

第１４図、第１５図、第１６図にそれぞれ実施例１３〜
１５の収差図を示す。Examples 13 to 14 are shown in FIG. 14, FIG. 15, and FIG. 16, respectively.
15 is shown.

各実施例とも収差は良好である。Aberrations are good in each example.

［発明の効果］以上、本発明によれば新規なスキャナー用読取レンズを
提供できる。[Effects of the Invention] As described above, according to the present invention, a novel reading lens for a scanner can be provided.

このレンズは上述の如く構成されているから、半画角２
０度と広画角で、７１．４本／ｒｎｍという高空間周波
数に於いても十分に高いコントラストを有し、明るさも
ＦＮＯ”３と明るく、開口効率も十分に高い値を有して
いる。Since this lens is constructed as described above, the half angle of view is 2
It has a wide field of view of 0 degrees, has sufficiently high contrast even at high spatial frequencies of 71.4 lines/rnm, has a brightness of FNO"3, and has a sufficiently high aperture efficiency. .

[Brief explanation of drawings]

第１図は、本発明のレンズ構成を説明するための図、第
２図乃至第１６図は、各実施例に関する収差図である。１０、、、第エレンズ、　１２．、、第２レンズ、１４
．、、第３レンズ、１５．、、絞り、１６．、、第４レ
ンズ、１８．、、第蕾／圃％＋ν７形Ｚ圀（実施例づ味＠収差非島収麦歪＠■差（〃）コマ収差形６国（突炭例２コマ収差形４０（実施４！Ｐ１６〕味面収杢非無吠を歪曲収差Ｃ′／−）コマ収差めａ囚（実Ｆ−例４味面収麦非無収＆歪＠収差（１−））コマ瞑差形７（実施ｆ列球面収１非点収差歪ｆｌＢ収差（ン：ンコマ収差めＩ（突毘剖ε も１Ｊ０（実施４ＰＪ１７１０３− アコマ収差形７４（穴虎改味面吠左ｑ［点収基歪曲収差（１）ＩＪ）コマ収差め４昂（実施イダ球面収差非ふ収差歪曲収差（ｌ、ｊ４４））コマ収差めｊ６（実施ψ 螺゛面収差非点収差歪曲収差（７−；１イ５）コマ瞑差FIG. 1 is a diagram for explaining the lens configuration of the present invention, and FIGS. 2 to 16 are aberration diagrams regarding each example. 10.,,Ellens, 12. ,, second lens, 14
．． ,, third lens, 15. ,,Aperture,16. , 4th lens, 18. ,, th bud / field% + ν7 form Z field (example taste @ aberration non-island grain distortion @ ■ difference (〃) coma aberration form 6 countries (charcoal example 2 coma aberration form 40 (implementation 4! P16) taste Distortion aberration C'/-) Coma aberration (actual F-Example 4 Flavor surface aberration non-convergence & distortion @ aberration (1-)) Coma aberration form 7 (practical f column Spherical aberration 1 Astigmatism distortion flB aberration (N: Ncoma aberration I ) IJ) Comatic aberration 4 (implemented Ida spherical aberration non-spherical aberration distortion (l, j44)) coma aberration j6 (implemented ψ spherical aberration astigmatism distortion aberration (7-; 1-5) coma aberration difference

Claims

[Claims] 1. A document reading lens used at a reduction magnification, in which first to fifth groups are arranged sequentially from the object side to the image side, and the second group and the third group are arranged sequentially from the object side to the image side. A diaphragm is arranged between them, and the first group is composed of a first lens that is a positive lens and a second lens that is a negative lens that is cemented to the image side of this first lens. is a third lens that is a meniscus lens with a convex surface facing the object side, the third group is a fourth lens that is a meniscus lens with a convex surface facing the image side, and the fourth group is a negative lens The fifth lens is composed of a fifth lens and a sixth lens which is a positive lens cemented to the image side of the fifth lens. The 4th, 6th, and 10th lens surfaces are aspherical, and the conic constants K_4, K_ of these aspherical surfaces are
6.K_1_0 is (1-I)-0.06<K_4<-0.01(1-II
) 0.0<K_6<0.04 (1-III) 0.0<K_1__0<0.02 A reading lens for a scanner having a configuration of 7 elements in 5 groups. 2. A document reading lens used at reduced magnification, in which the first to fifth groups are arranged sequentially from the object side to the image side, and an aperture is arranged between the second and third groups. The first group includes a first lens that is a positive lens and a second lens that is a negative lens that is cemented to the image side of the first lens, and the second group has a convex surface on the object side. The third lens is a meniscus lens with a convex surface facing the image side, and the fourth lens is a meniscus lens with a convex surface facing the image side. A sixth lens is a positive lens cemented to the image side of the fifth lens, and the fifth lens is a seventh lens that is a parallel plane glass. The tenth lens surface is an aspherical surface, and the conic constants K_3, K_ of these aspherical surfaces are
6.K_1_0 is (2-I)0.0<K_3<1.0 (2-II)0.0<K_6<0.02 (2-III)-0.006<K_1_0<0.0045
A reading lens for a scanner consisting of 7 elements in 5 groups, which satisfies the following conditions. 3. A document reading lens used at reduced magnification, in which the first to fifth groups are arranged sequentially from the object side to the image side, and an aperture is arranged between the second and third groups. The first group includes a first lens that is a positive lens and a second lens that is a negative lens that is cemented to the image side of the first lens, and the second group has a convex surface on the object side. The third lens is a meniscus lens with a convex surface facing the image side, and the fourth lens is a meniscus lens with a convex surface facing the image side. and a sixth lens which is a positive lens cemented to the image side of the fifth lens, and the fifth group is a seventh lens which is a parallel plane glass, and counting from the object side, there are 3rd, 7th and 6th lenses. The 8th lens surface is an aspherical surface, and the conic constants of these aspherical surfaces are K_3 and K_7.
, K_8 is (3-I)0.0<K_3<0.87 (3-II)-0.025<K_7<0.0 (3-III)0.0<K_8<10.0 A reading lens for scanners with a configuration of 7 elements in 5 groups, which is characterized by satisfactory characteristics. 4. A document reading lens used at reduced magnification, in which the first to fifth groups are arranged sequentially from the object side to the image side, and an aperture is arranged between the second and third groups. The first group includes a first lens that is a positive lens and a second lens that is a negative lens that is cemented to the image side of the first lens, and the second group has a convex surface on the object side. The third lens is a meniscus lens with a convex surface facing the image side, and the fourth lens is a meniscus lens with a convex surface facing the image side. and a sixth lens which is a positive lens cemented to the image side of the fifth lens, and the fifth group is a seventh lens which is a parallel plane glass, and counting from the object side, there are 3rd, 7th and 6th lenses. The tenth lens surface is an aspherical surface, and the conic constants K_3, K_ of these aspherical surfaces are
7.K_1_0 becomes (4-I)0.0<K_3<1.2 (4-II)-0.045<K_7<0.0 (4-III)-0.006<K_1_0<0.007 A reading lens for scanners consisting of 7 elements in 5 groups, which satisfies the following conditions. 5. A document reading lens used at reduced magnification, in which the first to fifth groups are arranged sequentially from the object side to the image side, and an aperture is arranged between the second and third groups. The first group includes a first lens that is a positive lens and a second lens that is a negative lens that is cemented to the image side of the first lens, and the second group has a convex surface on the object side. The third lens is a meniscus lens with a convex surface facing the image side, and the fourth lens is a meniscus lens with a convex surface facing the image side. and a sixth lens which is a positive lens cemented to the image side of the fifth lens, and the fifth lens is a seventh lens which is a parallel plane glass. The tenth lens surface is an aspherical surface, and the conic constants K_3, K_ of these aspherical surfaces are
8. Condition where K_1_0 is (5-I)0.0<K_3<0.8 (5-II)0.0<K_8<13.0 (5-III)-0.022<K_1_0<0.0 A reading lens for scanners consisting of 7 elements in 5 groups, which satisfies the following.