JPH03290607A

JPH03290607A - Read lens for scanner

Info

Publication number: JPH03290607A
Application number: JP9367490A
Authority: JP
Inventors: Yuuichirou Kanoshima; 彼島　雄一郎; Kiichiro Nishina; 喜一朗仁科; Koji Ichinomiya; 一宮　孝司
Original assignee: Ricoh Co Ltd
Current assignee: Ricoh Co Ltd
Priority date: 1990-04-09
Filing date: 1990-04-09
Publication date: 1991-12-20

Abstract

PURPOSE:To obtain a lens which is bright to have FNO=3 and has a wide field angle, namely, 20 deg. half field angle and is superior in resolving power by constituting a lens system of seven lenses of five groups and satisfying specific conditions. CONSTITUTION:The lens system consists of the first group consisting of a first positive lens 10 and a second negative lens 12 joined to the lens 10, the second group consisting of a third meniscus lens 14 whose convex is directed to the object side, the third group consisting of a fourth meniscus lens 16 which is convex to the image side, the fourth group consisting of a fifth negative lens 18 and a sixth positive lens 20 joined to the lens 18, and the fifth group consisting of a seventh lens made of plane glass which are arranged in order from the object side. Fifth, sixth, and seventh lens faces from the object side are formed to aspherical surfaces, and conditions of formulas I to III are satisfied where K5, K6, and K7 are conical constants of these aspherical surfaces respectively.

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ＣＯＤ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ｉハ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 COD,
2. Description of the Related Art Document reading, which scans a document and reads a document image, is known in connection with image scanners, facsimiles, 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 pickup device 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か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ＣＣＤ
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ＣＣＤの受光面上で７１．４本／ｍｍの解像力
が必要となり、しかも上記受光面全域にわたり上記空間
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 larger, 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, a CCD with a pixel size of 7 μm
In the case of a reading device that uses required.

広画角に適したレンズとして従来から知られたトポボン
型レンズはラジアル像面が平坦であるので、この特長を
生かした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６
４−２３２１５号公報）。The Topobon type lens, which has been known for a long time as a lens suitable for a wide angle of view, has a flat radial image surface, so a Topobon type scanner reading lens that takes advantage of this feature has been proposed (for example, Japanese Patent Application Laid-Open No. 1983-1999). Publication No. 75721, 6
4-23215).

［発明が解決しようとする課題］しかし反面、トポボン型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、
トボゴン型レンズをベースとし、Ｆ、、＝　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
The objective is to provide a new reading lens for scanners that is based on a tobogon type lens and has a brightness of F = 3, a wide angle of view, and excellent resolution.

口課題を解決する手段］以下１本発明を説明する。[Means to solve problems] One aspect of 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。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.

「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レンズ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。The "second group" is the third lens 14, which is a meniscus lens with a convex surface facing the object side. The "third group" is the fourth lens 16, which is a meniscus lens with a convex surface facing the image side.

「第４群」は、負レンズである第５レンズ１８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。「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 "fourth group" is composed of the fifth lens 18, which is a negative lens, and the sixth lens 20, which is a positive lens cemented to the image side of the fifth lens 18. The “fifth group” is the seventh group, which is a parallel plane glass.
The lens 22 is specifically 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５゜第６．第
７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、に６−に７が、（１−Ｉ）　　　　０．０
　　＜ハ、＜０．０２（１−ＩＩ）　　　−０，００５
＜　Ｋ６　＜　　０．００５（１−ＩＩＩ）　　　　　
−０，０１＜　　Ｋ７　　＜　　　０．０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、は物体側から第５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 angle of the lens is 5 degrees and 6 degrees as counted from the object side. The seventh lens surface is an aspherical surface, and the conic constant Ks of these aspherical surfaces is 6-7, (1-I) 0.0
<c, <0.02 (1-II) -0,005
< K6 < 0.005 (1-III)
The condition -0,01<K7<0.0 is satisfied. Of course, the suffix to the conic constant indicates the order of the "aspherical lens surface" from the object side.For example, in the above, when the fifth lens surface from the object side is an aspherical surface, this 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５゜第６．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、、に、、に、が、（２−Ｉ）０．　　　　　
　　　　０．０　　　＜　　Ｋｇ　　＜　　　０．０３
（２−ＩＩ）　　　　０．０　　＜　ＫＧ　＜　　０．
０３（２−ＩＩＩ）　　　　　　　０．５　　　＜　　
Ｋｍ　　＜　　　３．５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５゜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＆ｔＫ＠ｔに１０が、（３−Ｉ）０．　　　
　　０．０　　＜　Ｋｓ　＜　　０．０３（３−ＩＩ）
　　　　　　　　０．０１　　　＜　　に６　＜０．０
３（３−ＩＩＩ）　　　　　　　０．０　　　　＜ｌ（
１０＜　　　０．０２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１０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Ｋｌ、に７．に、が、（４−Ｉ）　　　　　　　
　　−０，０２５＜　　Ｋ、　　＜　　　０．０（４−
ＩＩ）　　　　　　　　−０，０２＜　　Ｈ７＜　　　
０．０（４−ＩＩＩ）　　　　　　　０．０　　　　＜
　　Ｋａ　　＜　　１２．０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５゜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ＫＭ、に７．に、が、（５−Ｉ）　　　　　　　
　　０．０　　　＜　　Ｋｓ　＜　　　０．０１８（５
（Ｉ）　　　　−０，０１８＜　Ｈ７＜　　０．０（５
−ＩＩＩ）　　　　０．０　　＜　Ｋ、　＜　１０．０
なる条件を満足する。In the lens according to the second aspect of the present invention, the angle of the lens is 5 degrees and 6 degrees as counted from the object side. The eighth lens surface is an aspherical surface, and the conic constants of these aspherical surfaces are: (2-I)0.
0.0 < Kg < 0.03
(2-II) 0.0 < KG < 0.
03(2-III) 0.5 <
The lens according to claim 3, which is characterized by the condition Km < 3.5, has an angle of 5 degrees and 6 degrees as counted from the object side. The tenth lens surface is an aspherical surface, and the conic constants of these aspherical surfaces are &tK@t=10, (3-I)0.
0.0 < Ks < 0.03 (3-II)
0.01 < 6 < 0.0
3(3-III) 0.0 <l(
The lens according to claim 4, which is characterized by the condition that 10<0.02, has a 10th and 7th lens as counted from the object side. The eighth lens surface is an aspherical surface, and the conic constant Kl of these aspherical surfaces is 7. ni, ga, (4-I)
-0,025<K,<0.0(4-
II) −0,02<H7<
0.0 (4-III) 0.0 <
In the lens according to claim 5, which is characterized by the condition that Ka<12.0, the angle of 5° and 7.0° as counted from the object side. The eighth lens surface is an aspherical surface, and the conic constant KM of these aspherical surfaces is 7. ni, ga, (5-I)
0.0 < Ks < 0.018 (5
(I) −0,018<H7<0.0(5
-III) 0.0 < K, < 10.0
satisfies the following conditions.

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＝［ＣＨ２／（１＋ｖ’丁：ズ］コ］ぐΣσ７■７）
コ＋Ａ２・Ｈ２＋Ａｓ・Ｈ３＋Ａ４・Ｈ４・・・・＋Ａ
１０・Ｈ３Ｏ＋・・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.
When , the curve X = [CH2/(1+v'cho:zu]ko]
+A2・H2+As・H3+A4・H4・・・+A
It is a curved surface obtained by rotating 10.H3O+... 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ボ
ゴン型をベースとしている。トポボ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リ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。[Function] The lenses according to claims 1 to 5 are all based on a tobogon type in order to achieve a wide angle of view. Although the Topobon type lens has a flat radial image plane with little curvature, the color breakage on the image plane increases as the angle of view increases, and the recontrast decreases significantly. 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, the flatness of the radial image plane, which is the original advantage of the Topobon type, is maintained.

像面の色割れを抑えることができた。It was possible 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.

一般に、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
。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。Generally, the larger the aperture, the more coma flare and the lower the contrast. In order to suppress coma flare, it is best to correct the extremely refracted surface of each input and exit surface. 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５．第６．第７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
５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（１−ＩＩ）を満足する第６レンズ面の非球面形
状はｒ長軸もしくは短軸に回転対称な楕円面」、条件（
１−ＩＩＩ）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」であり１条件（１−Ｉ）　、
　（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 fifth. 6th. When an aspherical surface is adopted as the seventh lens surface, the aspherical shape of the fifth lens surface that satisfies condition (1-I) is "an ellipsoidal surface that is rotationally symmetrical about the short axis."
The aspherical shape of the sixth lens surface that satisfies the first condition (1-II) is an ellipsoidal surface that is rotationally symmetrical about the r major axis or the minor axis, and the condition (
The aspherical shape of the seventh lens surface that satisfies 1-III) is “
It is an ellipsoid surface that is rotationally symmetrical about its long axis, and one condition (1-I),
The smallest coma flare can be achieved when (1-II) and (1-III) are satisfied.

請求項２のレンズのように、第５．第６．第８レンズ面
に非球面を採用する場合、条件（２−Ｉ）を満足する第
５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１条件（２−Ｉ）ｔ　（２−ＩＩ）
、　（２−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 2, the fifth. 6th. When an aspherical surface is adopted as the eighth lens surface, the aspherical shape of the fifth lens surface that satisfies condition (2-I) is "an ellipsoidal surface that is rotationally symmetrical about the short axis."
, the aspherical shape of the sixth lens surface that satisfies condition (2-II) is "an ellipsoid that is rotationally symmetrical about the minor axis", condition (2-III)
The aspherical shape of the eighth lens surface that satisfies the following is an "ellipsoidal surface rotationally symmetrical about the short axis" and one condition (2-I)t (2-II)
, (2-III), the smallest coma flare can be achieved.

請求項３のレンズのように、第５．第６．第１０レンズ
面に非球面を採用する場合、条件（３−Ｉ）を満足する
第５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６しンズ面の非球面
形状は「短軸に回転対称な楕円面」、条件（３−ＩＩＩ
）を満足する第１Ｏ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−ＩＬ　（３−ＩＩ
）、　（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 5th. 6th. When an aspherical surface is adopted as the 10th lens surface, the aspherical shape of the 5th lens surface that satisfies condition (3-I) is "an ellipsoid that is rotationally symmetrical about the short axis" and satisfies condition (3-II). The aspherical shape of the sixth lens surface is "ellipsoidal surface rotationally symmetrical about the short axis", and the condition (3-III
The aspherical shape of the first O lens surface that satisfies the condition (3-IL (3-II
), (3-III), the smallest coma flare can be achieved.

請求項４のレンズのように、第１．第７．第８レンズ面
に非球面を採用する場合１条件（４−Ｉ）を満足する第
１レンズ面の非球面形状はｒ長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−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（４−ＩＬ　（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。As in the lens of claim 4, the first. 7th. When an aspheric surface is adopted as the eighth lens surface, the aspheric shape of the first lens surface that satisfies the first condition (4-I) is an ellipsoid that is rotationally symmetrical about the r major axis.
The aspherical shape of the seventh lens surface that satisfies the first condition (4-II) is "an ellipsoid that is rotationally symmetrical about the major axis", and the condition (4-III)
The aspherical shape of the eighth lens surface that satisfies is "an ellipsoidal surface rotationally symmetrical about the short axis", and the condition (4-IL (4-II),
When (4-III) is satisfied, the smallest coma flare can be achieved.

請求項５のレンズのように、第５．第７．第８レンズ面
に非球面を採用する場合、条件（５−Ｉ）を満足する第
５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−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（５−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（５−ＩＬ　（５−ｍ、　（
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 fifth. 7th. When an aspherical surface is adopted as the eighth lens surface, the aspherical shape of the fifth lens surface that satisfies condition (5-I) is "an ellipsoidal surface that is rotationally symmetrical about the short axis."
, the aspherical shape of the seventh lens surface that satisfies condition (5-II) is an ellipsoid that is rotationally symmetrical about the r major axis.'', condition (5-III)
The aspherical shape of the eighth lens surface that satisfies is "an ellipsoidal surface rotationally symmetrical about the short axis", and the condition (5-IL (5-m, (
5-III), the smallest coma flare can be achieved.

［実施例コ以下、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。[Examples] Below, 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１
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ｊ番目のレンズ面
間隔をｄ、　（ｉ＝１〜１１）、第ｊ番目のレンズの屈
折率およびアツベ数をそれぞれｎｊ、ν、（ｊ：１〜７
）とする。In each embodiment, as shown in FIG.
The radius of curvature of the lens surface (on-axis radius of curvature for aspherical surfaces) is ri (i=1 to 12), the distance between the j-th lens surfaces is d, (i=1 to 11), and the j-th lens surface is Let the refractive index and Atsube number of the lens be nj, ν, (j: 1 to 7
).

またＦは全系の合成焦点距離、Ｆ＋ｗｏは明るさ、２ω
は画角（度）、　ｍｌは倍率を示す。Also, F is the composite focal length of the entire system, F + wo is the brightness, 2ω
indicates the angle of view (degrees), and ml indicates the magnification.

非球面には本邸を付し、軸上曲率半径の外、円錐定数と
高次の非球面係数Ａ４．Ａ、、Ａ、、Ａ、。を与えて非
球面形状を特定する。The aspherical surface is marked with ``hontei'', and in addition to the axial radius of curvature, the conic constant and the higher-order aspherical coefficient A4. A,,A,,A,. Specify the aspheric shape by giving .

なお非球面係数の表示に於いて、Ｅとそれに続く数字は
ｌＯのべき乗を示す。例えばＥ−１２とあれば、これは
ＩＱ−１１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 representation of the aspheric coefficient, E and the number following it indicate the power of lO. For example, E-12 means IQ-11, and the number before E is multiplied by this power.

実施例１Ｆ＝４３　　　、　Ｆｓｏ”３．０．２ω＝４０　　　
、ｍ”０．１１０２ｉ　　　　ｒｌ　　　　ｄｔ　　　
　ｊ　　　ｎｊ　　　νｊ１　　１９．５０４　６．９
９３　　１　１．８１６００　４６．６２２　　１１０
．９１４　２．２５１　　２　１．８４６６６　２３．
８９３　　３７．９０８　０．１００４　　１３．８１５　２．５０６　　３　１．８４６６
６　２３．８９５’　　　１０．０３４　９．８６２８’　　　−９，９４１２，２６６４１，８４８６６２
３，８９７’　　−１３，３９５０，１００８−９４，２３２２，２６５５１，８４６６８２３，８
９９２２５，１５６５，５４１６１，８１８００４６，
６２１０−２０，２８９２８，２１３１１ω　　　　０．７００　　　　７　１．５１６３３
　６４．１５１２　　　　　　Ｃ０非球面（第５レンズ面）Ｋ＝　０．００７８５２．Ａ、＝　２．０６８２０Ｅ−
６，Ａ６＝　４．４８２０９Ｅ−９Ａａニー８．７５９
０２Ｅ−１０−Ａｔ。、　１．２７０１３Ｅ−１１非球
面（第６レンズ面）Ｋ＝　０．０００６５５．Ａ４＝−６，１３８６３Ｅ−
６，Ａ６＝−４，１７８３２Ｅ−９゜Ａａ”−１，３６
６４７Ｅ−９、Ａｓ。＝　７．０７２１２Ｅ−１１非球
面（第７レンズ面）にニー０．００４５５６．Ａ、＝２．５１５１２Ｅ−６
，Ａｓ”−２，０５１８８Ｅ−８゜Ａ、＝　６．７３１
９４Ｅ−１０，ＡＩ。＝　３．８４４８０Ｅ−１２実施
例２Ｆ”４３　　　、　ＦＮＯ”３．０．２ω”４０　　　
、ｍ＝ｏ、１１０２ｉ　　　　ｒｉ　　　ｄｔ　　　　
ｊｎｊｌ　　　１８．８４０　６．１２０　　１　１．
７２９１６　５４．６８２　　１０７．１２５　２．２
７８　　２　１．７８４７２　２５．７１３　　４１．
２６８　０．１００４　　１３．４０８　２．８８０　　３　１．８４６６
８　２３．８９５１　　　　９．７７４　　９．８９３
６本　　　−９，５５７２，７９０４１，７４０７７２
７，７９７ｒ　　−１３，２０７０，１００８−９８，７７２１，０００５１，６８８９３３１，０
８９９０，０１４５，３７９６１，７２９１６５４，６
８１０−１９，７７７２８，４３４１１ω　　　　０．７００　　　　７　１．５１８３３
　　Ｂ４．１５１２　　　　　ψ 非球面（第５レンズ面）Ｋ＝　０．００４０１８．Ａ４＝　１．３４７７０Ｅ−
６，Ａ、＝−１，１３５４１Ｅ−８゜Ａ、＝−１，２１
８４７Ｅ−９、Ａ、。＝　１．４００９５Ｅ−１１非球
面（第６レンズ面）Ｋ＝−０，０００３０６，Ａ４＝−６，８１９９６Ｅ−
６，Ａｓ＝−１，４０２２２Ｅ−８゜Ａａ＝−１，２９
０７１Ｅ−９、Ａｔｏ”　７．２１８２９Ｅ−１１非球
面（第７レンズ面）Ｋ、−０，００２２５９，Ａ４＝　２．０１２９８Ｅ−
８，Ａ６＝−１，９２４８１Ｅ−８゜Ａｓ＝５．０６６
３６Ｅ−１０，Ａｘｏ”　３．２９６２１Ｅ−１２実施
例３Ｆ”４３　　　、　ＦＮＯ”３．０．２ω”４０　　．
０１”０．１１０２ｉ　　　　ｒ、　　　　ｄ、　　　
　ｊ　　　ｎｌ　　　９ｊ１　　　　１９．４９２　　
６．７６２　　　１　１．８１６００　４６．６０２　
　　１２３．８９３　　１．９５７　　　２　１．８１
６７６　２４．７２３　　　　３７．８４０　　０．１
００４　　　１４．４６８　　２．６８２　　　３　１
．８４７００　２３．９０５本　　　１０．２７３　　
９．８０５６本　　−ＩＱ、７５７　　２．２９８　　
　　４　１．８４７００　２３．９０７”　　　−１４
，８４８０，１００８−８７，８５０１，９４２５１，７９３９６２５，４
２９９８，２０７５，２０６６１，８２８９９４３，８
４１０−２０，３７４２８，８４４１１（Ｘ）　　　　　０．７００　　　　　？　　１．
５１６３３　６４．１５１２　　　　　ω 非球面（第５レンズ面）Ｋ＝　０．０１８４８０．Ａ、＝　３．８１５５８Ｅ−
６，Ａ、＝　４．００９０９Ｅ−８゜Ａａ”−６，１８
１４４Ｅ−１０，Ａｔｏ”　１．１８１３２Ｅ−１１非
球面（第６レンズ面）Ｋ”　０．００２２１５＝Ａ４”−６−４１３５６Ｅ−
６，ＡＳ”−３，６０５００Ｅ−９゜Ａａ”−１，４７
２２９Ｅ−９−Ａｔ。＝　８．５３０５４Ｅ−１１非球
面（第７レンズ面）に＝−０，００５７８７，Ａ４＝　２．６８６９１Ｅ−
６，Ａｓ＝−２，６８４５０Ｅ−８゜Ａａ”　　７．８
５４０１Ｅ−１０，Ａｔ。＝３．９７２６９Ｅ−１２以
上が請求項１のレンズの実施例である。Example 1 F=43, Fso”3.0.2ω=40
, m”0.1102i rl dt
j nj νj1 19.504 6.9
93 1 1.81600 46.622 110
．． 914 2.251 2 1.84666 23.
893 37.908 0.100 4 13.815 2.506 3 1.8466
6 23.895' 10.034 9.862 8' -9,9412,26641,848662
3,897' -13,3950,100 8-94,2322,26551,8466823,8
99225, 1565, 54161, 8180046,
6210-20,28928,213 11ω 0.700 7 1.51633
64.1512 C0 Aspherical surface (fifth lens surface) K= 0.007852. A, = 2.06820E-
6, A6 = 4.48209E-9Aa knee 8.759
02E-10-At. , 1.27013E-11 aspherical surface (sixth lens surface) K=0.000655. A4=-6,13863E-
6, A6=-4,17832E-9゜Aa"-1,36
647E-9, As. = 7.07212E-11 Aspherical surface (7th lens surface) Knee 0.004556. A, =2.51512E-6
, As”-2,05188E-8°A, = 6.731
94E-10, AI. = 3.84480E-12 Example 2 F”43, FNO”3.0.2ω”40
, m=o, 1102i ri dt
jnjl 18.840 6.120 1 1.
72916 54.682 107.125 2.2
78 2 1.78472 25.713 41.
268 0.100 4 13.408 2.880 3 1.8466
8 23.8951 9.774 9.893
6 pieces -9,5572,79041,740772
7,797r -13,2070,100 8-98,7721,00051,6889331,0
8990,0145,37961,7291654,6
810-19,77728,434 11ω 0.700 7 1.51833
B4.1512 ψ Aspherical surface (fifth lens surface) K= 0.004018. A4 = 1.34770E-
6,A,=-1,13541E-8゜A,=-1,21
847E-9,A. = 1.40095E-11 Aspherical surface (sixth lens surface) K=-0,000306, A4=-6,81996E-
6, As=-1,40222E-8゜Aa=-1,29
071E-9, Ato" 7.21829E-11 Aspherical surface (7th lens surface) K, -0,002259, A4 = 2.01298E-
8, A6=-1,92481E-8°As=5.066
36E-10, Axo” 3.29621E-12 Example 3 F”43, FNO”3.0.2ω”40.
01"0.1102i r, d,
j nl 9j1 19.492
6.762 1 1.81600 46.602
123.893 1.957 2 1.81
676 24.723 37.840 0.1
004 14.468 2.682 3 1
．． 84700 23.905 pieces 10.273
9.8056 books -IQ, 757 2.298
4 1.84700 23.907" -14
,8480,100 8-87,8501,94251,7939625,4
2998, 2075, 20661, 8289943, 8
410-20,37428,844 11(X) 0.700? 1.
51633 64.1512 ω Aspherical surface (fifth lens surface) K= 0.018480. A, = 3.81558E-
6, A, = 4.00909E-8°Aa”-6,18
144E-10, Ato" 1.18132E-11 Aspherical surface (sixth lens surface) K"0.002215=A4"-6-41356E-
6,AS"-3,60500E-9゜Aa"-1,47
229E-9-At. = 8.53054E-11 Aspherical surface (7th lens surface) = -0,005787, A4 = 2.68691E-
6, As=-2,68450E-8゜Aa" 7.8
5401E-10, At. =3.97269E-12 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ｄ線、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, in the aberration diagrams of each example below, ■, ■, and ■ represent the d-line and C-line, 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４、Ｆｓｏ”３．０　．２ω＝４０ｉ　　　　　　ｒｉｄｔ　　　　　　　ｊｌ　　　　　
１９．２６７　　７．１３８　　　　１２　　　１０６
．６９４　　２．３３２　　　　２３　　　　３６．６
４６　　０．１００４　　　　１３．４４３　　２．３
７１５’　　　　　９．８３４　　９．９１２６＊　　
　−９，７５８２，１４８７−１３，００９０，２３３８’　　　−８８，９８９２，３３８９２３２，２９４５，６６１１０−２０，０７７２７，８６８１１ｏｏ　　　　Ｏ，７００１２ｏ。In addition, the broken line in the diagram of spherical aberration indicates the sine condition, and the solid line in the diagram of astigmatism indicates the radial condition.
19.267 7.138 12 106
．． 694 2.332 23 36.6
46 0.1004 13.443 2.3
715' 9.834 9.9126*
-9,7582,148 7-13,0090,233 8' -88,9892,338 9232,2945,661 10-20,07727,868 11oo O,700 12o.

非球面（第５レンズ面）Ｋ”　０．００６７９１．Ａ４：１．９３３４７Ｅ−６
，Ａ６：２．７６４２２Ｅ〜１０Ａａ”４．２８６９２
Ｅ−１０，Ａｔｏ”　］、２９８８３Ｅ−１１非球面（
第６レンズ面）Ｋ＝　０．００６４７７、Ａ、＝−９，０１２５８Ｅ−
８，Ａ！＝　１．２５６２２Ｅ−８゜５　１．８４８８
６　２３．８９６　１．８１６００　４６．６２、ｍ＝０．１１０２ｎｊ　　　　　　Ｖ４１．８１６００　４Ｂ、６２１．８４６６６　２３．８９３　１．８４６８６　２３．８９４　１．８４６６６　２３．８９７　１．５１６３３　６４．１５Ｆ＝４３Ａａ”Ｊ、８５５１７Ｅ−１０，ＡＩｏ”　１．７６８
７６Ｅ−１１非球面（第８レンズ面）Ｋ＝　１．０８００７５．Ａ４ニー２．０８３７８Ｅ−
７，Ａ、＝−４，９５９２１Ｅ−９゜Ａａ＝−６，１１
３４４Ｅ−１１，ＡＩ。＝　４．７４７５８Ｅ−１３実
施例５Ｆ”４３　　　、　ＦＮＯ：３．０．２ω＝４０ｉ　　
　　ｒｌ　　　　ｄｌ　　　　ｊｌ　　　１８．６９５
　６．００４　　１２　　１０５．９９７　２．０７３
　　２３　　４３．０９０　０．１００４　　１３．２６３　３．０６６５”　　　９．４１１　１０．０３６６ネ　−１０．９５５　３．３７３７　　−１８．３２８　０．１００８”　　−１１２，６７０１，０００９９８，０６９５，７４２１０−１９，１６４２８，１６０ＩＩ　　　　”　　　０．７００１２　　　　ω 非球面（第５レンズ面）５　１．６８８９３　３１．０８、Ｉａ＝０．１１０２ｎｊ　　　　　νｊ１．７２９１６　５４．６８１．７８４７２　２５．７１３　１．８４８６８　２３．８９４　１．７４０７７　２７．７９６　１．７２９１６　５４．６８７　１．５１Ｂ３３　　Ｆ３４．１５に＝０．００９７１０．Ａ、＝　２．０３６８３Ｅ−８
，Ａ６＝　６．６３６０７Ｅ−８゜Ａ、＝−１，４００
８９Ｅ−９、Ａｔ。＝　２．６５７９０Ｅ−１１非球面
（第６レンズ面）に＝　０．０２００８４．Ａ、＝−１，８７５９５Ｅ−
５，Ａ６＝　７．８４５８８Ｅ−８゜Ａａ”−１，８０
７４７Ｅ−９、Ａ□。＝　５．１５４１９Ｅ−１１非球
面（第８レンズ面）ド、　３．４２９８８１．Ａ４＝−４，９１２６８Ｅ−
７，Ａｓ２−１．２５３７１Ｅ−８゜Ａａ＝−１，６１
８９６Ｅ−１０，Ａ１０＝　８．９７４１８Ｅ−１３実
施例６Ｆ＝４３　　　、　Ｆｘｏ＝３．０．２ｃ、＋＝４０　
　　、ｍ：０．１１０２１　　　貞　　　ｄｔ　　　　
ｊ　　　Ｊ　　　ツｊ１　　１９．２３７　６．８６０
　　１　１．８１６００　４６．６０２　　１１２．１
４９　２．００４　　２　１．８０７５７　２４．９９
３　　３８．０２０　０．１００４　　１４．６７４　２．７００　　３　１．８４７０
０　２３．９０５’　　　１０，１１５　１０．１１０
６’　　−１２，０８０２，８１１４１，８４７００２
３，９０７−１７，６３３０，１００８″’　　−８４，５８８１，４２ｇ　　　５　１．７
６０６９　２６．６０９　　８７．７０６　５．４１７
　　６　１．８２８８３　４３．８７１０　　−１９．
６８３　２８．５８４１１　　　　ω　　　　０．７０
０　　　　７　１．５１６３３　６４．１５１２　　　
　　ω 非球面（第５レンズ面）Ｋ＝　０．０２９８３３．Ａ、＝　６．７２５６０Ｅ−
６，Ａ６＝　１．００３７５Ｅ−７゜Ａａ＝−１，９３
９７１Ｅ−１０，ＡＩ。＝３．１７４０１Ｅ−１１非球
面（第６レンズ面）Ｋ＝　０．０２０２３１．Ａ、＝−１，４３８８２Ｅ−
５，Ａ、＝　６．１２９７０Ｅ−８゜Ａａ＝−１，２１
５０６Ｅ−９、ＡＩ。＝　５．３６６８７Ｅ−１１非球
面（第８レンズ面）Ｋ”　０．８３７８８０．Ａ４＝−１，３０８２３Ｅ−
７，Ａｓ２−１．５１１７９Ｅ−８゜ＡＭ＝−２，３１
４８３Ｅ−１０，ＡＩ。＝　１．１１７４６Ｅ〜１２以
上が請求項２のレンズの実施例である。Aspherical surface (fifth lens surface) K” 0.006791.A4:1.93347E-6
, A6:2.76422E~10Aa”4.28692
E-10, Ato”], 29883E-11 aspherical surface (
6th lens surface) K = 0.006477, A, = -9,01258E-
8, A! = 1.25622E-8゜5 1.8488
6 23.89 6 1.81600 46.62, m=0.1102 nj V4 1.81600 4B, 62 1.84666 23.89 3 1.84686 23.89 4 1.84666 23.89 7 1.51633 64 .15 F=43 Aa"J, 85517E-10, AIo" 1.768
76E-11 Aspherical surface (8th lens surface) K= 1.080075. A4 knee 2.08378E-
7,A,=-4,95921E-9゜Aa=-6,11
344E-11, AI. = 4.74758E-13 Example 5 F”43, FNO:3.0.2ω=40i
rl dl jl 18.695
6.004 12 105.997 2.073
23 43.090 0.100 4 13.263 3.066 5" 9.411 10.036 6 -10.955 3.373 7 -18.328 0.100 8" -112,6701,000 998,0695 ,742 10-19,16428,160 II ” 0.700 12 ω Aspherical surface (fifth lens surface) 5 1.68893 31.08 , Ia=0.1102 nj νj 1.72916 54.68 1.78472 25. 71 3 1.84868 23.89 4 1.74077 27.79 6 1.72916 54.68 7 1.51B33 F34.15 = 0.009710.A, = 2.03683E-8
, A6= 6.63607E-8°A, =-1,400
89E-9, At. = 2.65790E-11 aspherical surface (sixth lens surface) = 0.020084. A, =-1,87595E-
5, A6 = 7.84588E-8゜Aa”-1,80
747E-9, A□. = 5.15419E-11 Aspherical surface (8th lens surface) 3.429881. A4=-4,91268E-
7, As2-1.25371E-8゜Aa=-1,61
896E-10, A10=8.97418E-13 Example 6 F=43, Fxo=3.0.2c, +=40
, m: 0.11021 Sada dt
j J Tsuj1 19.237 6.860
1 1.81600 46.602 112.1
49 2.004 2 1.80757 24.99
3 38.020 0.100 4 14.674 2.700 3 1.8470
0 23.905' 10,115 10.110
6'-12,0802,81141,847002
3,907-17,6330,100 8″'-84,5881,42g 5 1.7
6069 26.609 87.706 5.417
6 1.82883 43.8710 -19.
683 28.58411 ω 0.70
0 7 1.51633 64.1512
ω Aspherical surface (fifth lens surface) K= 0.029833. A, = 6.72560E-
6, A6 = 1.00375E-7゜Aa = -1,93
971E-10, AI. =3.17401E-11 aspherical surface (sixth lens surface) K=0.020231. A, =-1,43882E-
5, A, = 6.12970E-8゜Aa = -1,21
506E-9, AI. = 5.36687E-11 Aspherical surface (8th lens surface) K” 0.837880.A4=-1,30823E-
7, As2-1.51179E-8°AM=-2,31
483E-10, AI. = 1.11746E to 12 or more are examples 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　　−　Ｆｗｏ：３．０．２ω＝４０　　　、
ｍ＝０．１１０２ｉ　　　　ｒｉ　　　　ｄｔ　　　　
ｊ　　　ｎｓｌ　　　１９．４９８　７．０７３　　１
　１．８１８００　４８．６２２　　１１０．０１３　
２．３００　　２　１．８４６６６　２３．８９３　　
　　３８．４２１　　０．１００４　　　１３−６３８
　　２．４９８　　　３　１．８４６６６　２３．８９
５”　　　　Ｌ８２４　　９．８９７６’　　　−１０，７０５２，５１０４１，８４６６６
２３，８９７−１４，８３４０，１００８−９１，６３１２，２１７５１，８４６６６１２３，
８９９２６６，７３５５，４７６６１，８１６００４６
，６２１０才　〜１９．８３３　２８．１７７１１　　
　　ψ　　　０．７００　　　７　１．５１６３３　６
４．１５１２　　　　　ω 非球面（第５レンズ面）Ｋ＝　０．０１２４１２．Ａ、＝　３．１６８６８Ｅ−
６，Ａ６＝　２．３６５２９Ｅ−８゜Ａｊ＝−７，７４
０９４Ｅ−１０，Ａｌ０＝　１．９８７０４Ｅ−１１非
球面（第６レンズ面）Ｋ＝　０．０１５７３１．Ａ４＝−１，３０８３４Ｅ−
５，Ａ６＝−４，８６３３３Ｅ−８゜Ａａ＝−２，９３
０１９Ｅ−９、Ａ□。、　７．１５５９２Ｅ−１１非球
面（第１０レンズ面）Ｋ”　０．００９３２０．Ａ４”−６，７２０５４Ｅ−
８，Ａ６”−５，８６３３７Ｅ−９゜Ａａ”　４．８２
０７２Ｅ−１１，ＡＩｏ”　１．４２４９０Ｅ−１３実
施例８Ｆ”４３　　　　　　ｙ　　ＦＨｏ二３．０．２ω：４
０　　　２ｍ＝０．１１０２１　　　　　　ｒ＊　　　
　　ｄｔ　　　　　　Ｊ　　　　ｎｊ％ｌ　４１　　　
　１８．８５２　　５．９８８　　　　１　１．７２９
１６　５４．６８２　　　１０Ｂ、６７４　　２．１２
２　　　　２　１．７８４７２　２５．７１３　　　　
４２．９７１　　０．１００４　　　　１３．２９０　
　３．０１７　　　　３　１．８４６８６　２３．８９
５’　　　　　９．５１１　　９．９０２６護　　−１
０，６７５３，２４９４１，７４０７７２７，７９７−
１５，５０２０，１００８−９８，８２７１，０００５１，６８８９３３１，０
８９９７，５８７５，５３７Ｂ　　１．７２９１６　５
４．６８１０’　　　−１９，２１５２８，５５３１１
φ　　　　０．７００　　　　７　１．５１Ｂ３３　６
４．１５１２　　　　　ω 非球面（第５レンズ面）Ｋ＝　０．００７０４９．Ａ、＝　１．７２３１５Ｅ−
１３，Ａ！＝　２．８４６２０Ｅ−８゜Ａａ”−１，４
４８６１Ｅ−９、ＡＩｏ：１．７８５３２Ｅ−１１非球
面（第６レンズ面）Ｋ＝０．０２０３５２．Ａ４ニー１．８３１４９Ｅ−５
，Ａｓ”−３，９６６７６Ｅ−８゜Ａｓ”−３，８２３
５５Ｅ−９、Ａｔ。＝　８．２１３１１Ｅ−１１非球面
（第１０レンズ面）Ｋ”　０．０１４１０５．Ａｎ”−３，８９６０８Ｅ−
７，Ａｓニー５．５９４３７Ｅ−９゜Ａａニア、９７８
６２Ｅ−１１，ＡＩ。＝　９．９３１２９Ｅ−１４実施
例９Ｆ＝４３　　−　Ｆ＊ｏ＝３．０．２ω＝４０．ド０．
１１０２１　　　　ｒｌ　　　　ｄＩ　　　　Ｊ　　　
ｎｊＶＪｌ　　　１９．４０７　６．９０３　　１　１
．８１６００　４６．６０２　　１１３．４３９　２．
０３５　　２　１．８１２９１　２４．８３３　　３８
．０４８　０．１００４　　１４．３８８　２．６２９　　３　１．８４７０
０　２３．９０５”　　　１０．０５８　９．８８４６”　　−１１，９３５２，５００４１，８４７００２
３，９０７−１７，０８８０，１００８−７９，８２０１，８０９５１，７６５５４２６，４
１９８６，１１１５，２３３Ｂ　　１．８３０３２　４
３．５８１０車　　−１９，８０１２８，８４７１１ｏ
＋）０．７００　　７　１．５１６３３　６４．１５１
２　　　　ｏ。Example 7 F=43-Fwo:3.0.2ω=40,
m=0.1102i ri dt
j nsl 19.498 7.073 1
1.81800 48.622 110.013
2.300 2 1.84666 23.893
38.421 0.1004 13-638
2.498 3 1.84666 23.89
5" L824 9.897 6' -10,7052,51041,84666
23,897-14,8340,100 8-91,6312,21751,84666123,
899266, 7355, 47661, 8160046
, 6210 years old ~ 19.833 28.17711
ψ 0.700 7 1.51633 6
4.1512 ω Aspherical surface (fifth lens surface) K= 0.012412. A, = 3.16868E-
6, A6 = 2.36529E-8゜Aj = -7,74
094E-10, Al0 = 1.98704E-11 Aspherical surface (sixth lens surface) K = 0.015731. A4=-1,30834E-
5, A6=-4,86333E-8゜Aa=-2,93
019E-9, A□. , 7.15592E-11 Aspherical surface (10th lens surface) K” 0.009320.A4”-6,72054E-
8, A6”-5,86337E-9゜Aa” 4.82
072E-11, AIo" 1.42490E-13 Example 8 F"43 y FHo2 3.0.2ω: 4
0 2m=0.11021 r*
dt J nj%l 41
18.852 5.988 1 1.729
16 54.682 10B, 674 2.12
2 2 1.78472 25.713
42.971 0.1004 13.290
3.017 3 1.84686 23.89
5' 9.511 9.9026 Mamoru -1
0,6753,24941,7407727,797-
15,5020,100 8-98,8271,00051,6889331,0
8997,5875,537B 1.72916 5
4.6810' -19,21528,55311
φ 0.700 7 1.51B33 6
4.1512 ω Aspherical surface (fifth lens surface) K= 0.007049. A, = 1.72315E-
13, A! = 2.84620E-8゜Aa”-1,4
4861E-9, AIo: 1.78532E-11 aspherical surface (sixth lens surface) K=0.020352. A4 knee 1.83149E-5
, As”-3,96676E-8゜As”-3,823
55E-9, At. = 8.21311E-11 Aspherical surface (10th lens surface) K” 0.014105.An”-3,89608E-
7, As knee 5.59437E-9°Aa near, 978
62E-11, AI. = 9.93129E-14 Example 9 F=43 − F*o=3.0.2ω=40. Do 0.
11021 rl dI J
njVJl 19.407 6.903 1 1
．． 81600 46.602 113.439 2.
035 2 1.81291 24.833 38
．． 048 0.100 4 14.388 2.629 3 1.8470
0 23.905" 10.058 9.884 6" -11,9352,50041,847002
3,907-17,0880,100 8-79,8201,80951,7655426,4
1986,1115,233B 1.83032 4
3.5810 car -19,80128,84711o
+)0.700 7 1.51633 64.151
2 o.

非球面（第５レンズ面）Ｋ＝　０．０２４６６８．Ａ、＝　５．７７２１９Ｅ−
６，Ａ！＝　７．３９０７０Ｅ−８゜Ａｓニー３．０３
４９７Ｅ−１０−Ａｓｏ：２−３１１１８Ｅ−１１非球
面（第６レンズ面）Ｋ”　０．０２１５４９．Ａ４”−１，３５０２６０−
５，Ａｉ”−２，４８５１４Ｅ−８−Ａａ”−２，４６
２７２Ｅ−９、Ａｇｏ”　７．９８８０３Ｅ−１１非球
面（第１０レンズ面）Ｋ＝　０．００８０７６、Ａ、＝　２．３２９２４Ｅ−
８，Ａ、＝−７，３４１８７Ｅ−９Ａａ”　７．００５
１３Ｅ−１１，Ａ、。＝　２．４７６３１Ｅ−１３以上
が請求項３のレンズの実施例である。Aspherical surface (fifth lens surface) K= 0.024668. A, = 5.77219E-
6, A! = 7.39070E-8°As knee 3.03
497E-10-Aso:2-31118E-11 Aspherical surface (6th lens surface) K” 0.021549.A4”-1,350260-
5, Ai”-2,48514E-8-Aa”-2,46
272E-9, Ago” 7.98803E-11 Aspherical surface (10th lens surface) K = 0.008076, A, = 2.32924E-
8,A,=-7,34187E-9Aa” 7.005
13E-11,A. =2.47631E-13 or more is an embodiment of the lens according to claim 3.

第８図、第９図、第１０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　　　、　Ｆ１１０＝３．０．２ω＝４０　　
　、＋＋＋＝０．１１０２ｉ　　　　ｒｌ　　　　ｄｓ
　　　　ｊ　　　ｎｉ　　　９　ｉ１本　　　　１９．
７２１　　　７，２０５　　　　　１　　１．８１６０
０　　４６．６２２　　１３０．１８５　２．７２１　
　２　１．８４６６Ｂ　　２３．８９３　　４１．２６
５　０．１００４　　１３．９７５　２．５８５　　３　１．８４６８
６　２３．８９５　　　９．８１７　１０．６５８６　　−１０．３６６　２．６２０　　４　１．８４６
６６　２３．８９７”　　−１４，６０５０，１００８”　　−１１２，３８８１，７９９５１，８４８ＢＢ
　　２３．８９９　　　２０４．０４１　　５．３６７
　　　　６　１．８１６００　４６．６２１０　　−１
９．７０４　２６．８９９１１　　　　　ｃｏ　　　　
　Ｏ，７００７１，５１６３３６４，１５１２ｃ１３非球面（第１レンズ面）Ｋニー０．０２１９６１．Ａ＜”−９，８６４８４Ｅ−
７，Ａｓ”　１．１０６５０Ｅ−１０Ａ６＝−１，２７
４２９Ｅ−１１，Ａｔ。＝−８，１０５７５Ｅ−１５非
球面（第７レンズ面）Ｋ＝−０，０１８１５８，Ａ４＝　７．５０４４９Ｅ−
８，Ａ６＝−５，８３３７８Ｅ−８゜Ａａ”　２．２１
７８０Ｅ−１０，Ａ□。、−３，５０７９１Ｅ−１２非
球面（第８レンズ面）Ｋ＝　６．１３３１６３．Ａ４＝−９，Ｂ４４４０Ｅ−
７，Ａ、＝−１，６５３９９Ｅ−８Ａ、＝−１，２２２
４２Ｅ−１０，Ａ、。＝　８．９４８８３Ｅ−１３実施
例１１Ｆ＝４３　　　、　ＦＮＯ”３．０．２ω＝４０　　　
、ｍ＝ｏ、１１０２ｉ　　　　ｒ、　　　　ｄ、　　　
　ｊ　　　ｎＪ　　　１／ｊ１’　　　１８．５９９　
６．４１５　　１　１．７２９１６　５４．６８２　　
１１３．１２７　２．６０８　　２　１．７８４７２　
２５．７１３　　４１．９０８　０．１００４　　　　１３．４０８　　２．９２６　　　３　１．
８４６６６　２３．８９５　　　　　９，５９９　１０
．４９２６　　　　−９．４９８　　２．８８３　　　
　４　１．７４０７７　２７．７９７零　　−１３，３
８９０，１００８本　　−１２０，０８４１，０００５１，６８８９３
３１，０８９８０，３３９６，００５６１，７２９１６
５４，６８１０−１９，５４８２６，５６７１１ψ　　　　０，７００　　　　７　１．５１８３３
　６４．１５１２ｏ。Example 1O F=43, F110=3.0.2ω=40
,+++=0.1102i rl ds
j ni 9 i1 book 19.
721 7,205 1 1.8160
0 46.622 130.185 2.721
2 1.8466B 23.893 41.26
5 0.100 4 13.975 2.585 3 1.8468
6 23.895 9.817 10.658 6 -10.366 2.620 4 1.846
66 23.897" -14,6050,100 8" -112,3881,79951,848BB
23.899 204.041 5.367
6 1.81600 46.6210 -1
9.704 26.89911 co
O, 70071, 5163364, 1512c13 Aspherical surface (first lens surface) K knee 0.021961. A<”-9,86484E-
7, As” 1.10650E-10A6=-1,27
429E-11, At. =-8,10575E-15 Aspherical surface (7th lens surface) K=-0,018158,A4=7.50449E-
8, A6=-5,83378E-8゜Aa" 2.21
780E-10,A□. , -3,50791E-12 aspherical surface (8th lens surface) K=6.133163. A4=-9, B4440E-
7,A,=-1,65399E-8A,=-1,222
42E-10,A. = 8.94883E-13 Example 11 F=43, FNO"3.0.2ω=40
, m=o, 1102i r, d,
j nJ 1/j1' 18.599
6.415 1 1.72916 54.682
113.127 2.608 2 1.78472
25.713 41.908 0.100 4 13.408 2.926 3 1.
84666 23.895 9,599 10
．． 4926 -9.498 2.883
4 1.74077 27.797 zero -13,3
890,100 8 pieces -120,0841,00051,68893
31,08980,3396,00561,72916
54,6810-19,54826,567 11ψ 0,700 7 1.51833
64.1512o.

非球面（第１レンズ面）Ｋ＝−０，０１２８７９，Ａ、＝−６，７９８２３Ｅ−
７，Ａ、＝　１．７０５３３Ｅ−１０ＡＪｌ＝−１，１
２６３７Ｅ−１１，Ａ、。＝−２，８８０１０Ｅ−１４
非球面（第７レンズ面）Ｋ＝−０，０１０３３０，Ａ、＝　６．８１４３９Ｅ−
６，Ａ、＝−５，５４５１３Ｅ−８゜Ａａ＝　９，０２
７７６Ｅ−１１，Ａ□。＝　１．２８７２４Ｅ−１３非
球面（第８レンズ面）Ｋ＝１１．３３１９９８．Ａ、＝−１，３４７１４Ｅ−
６，Ａｓ＝−１，３４７０４Ｅ−８゜Ａａ”−８，１０
２２６Ｅ−１１，Ａ１０ニア、４１２７１Ｅ−１３実施
例１２Ｆ”４３　　　、　ＦＮＯ”３．０．２ω＝４０　　　
、ｍ”０．１１０２ｉ　　　　　　ｒｌ　　　　　ｄ＋
　　　　　　ｊ　　　ｎｊ　　　　　ｖＪ１’　　　　
１９．０９７　　７．０５９　　　１　１．８１６００
　４６．６０２　　　１２０．２７６　　２．１８０　
　　２　１．８４１６９　２３．９０３　　　３４．９
４２　　０．３２７４　　　１３．１９３　　２．３２７　　　３　１．８
４７００　２３．９０５　　　　９．８０２　１０．２
３５６　　　−８．９９５　　１．９１６　　　４　１．８
４７００　２３．９０７本　　−１１，６０９０，４０
５８オ　　−８５．３４０　　２．２６１　　　　５　１
．８３１９７　２４．２９９　　　１３９．４０１　　
５．６０５　　　　６　１．８１８７９　４５．９７１
０　　−２０．３７９　２７．２５２１１　　　　ω　
　　　０，７００　　　７　１．５１６３３　６４．１
５１２ｏ。Aspherical surface (first lens surface) K=-0,012879,A,=-6,79823E-
7,A,=1.70533E-10AJl=-1,1
2637E-11,A. =-2,88010E-14
Aspherical surface (7th lens surface) K=-0,010330,A,=6.81439E-
6,A,=-5,54513E-8゜Aa=9,02
776E-11, A□. = 1.28724E-13 aspherical surface (8th lens surface) K=11.331998. A, =-1,34714E-
6, As=-1,34704E-8゜Aa"-8,10
226E-11, A10 near, 41271E-13 Example 12 F”43, FNO”3.0.2ω=40
, m”0.1102i rl d+
j nj vJ1'
19.097 7.059 1 1.81600
46.602 120.276 2.180
2 1.84169 23.903 34.9
42 0.327 4 13.193 2.327 3 1.8
4700 23.905 9.802 10.2
35 6 -8.995 1.916 4 1.8
4700 23.907 pieces -11,6090,40
5 8o -85.340 2.261 5 1
．． 83197 24.299 139.401
5.605 6 1.81879 45.971
0 -20.379 27.25211 ω
0,700 7 1.51633 64.1
512o.

非球面（第１レンズ面）Ｋ＝−０，００２６２７，Ａ、＝−１，７９１６７Ｅ−
７，Ａ、＝　７．５５６０７Ｅ−１０Ａａ：１．００１
３９Ｅ−１２，Ａ、。＝−２，４７２９４Ｅ−１４非球
面（第７レンズ面）Ｋ”−０，００３７８３，Ａ４”　２．４６０７７Ｅ−
６，Ａｓ”−１，０１７２９Ｅ−８゜Ａａ”　４．４６
４８８Ｅ−１１，Ａｔ。＝１．３３８２７Ｅ−１２非球
面（第８レンズ面）Ｋ”　０．８０９８９２．Ａ４”−１，６５１０３Ｅ−
７，ＡＩ、”−１，３２８８８Ｅ−９゜Ａａミニ−，３
３６７１Ｅ−１１，Ａｔ。＝１．３５４４１Ｅ−１３以
上が請求項４のレンズの実施例である。Aspherical surface (first lens surface) K=-0,002627,A,=-1,79167E-
7, A, = 7.55607E-10Aa: 1.001
39E-12,A. =-2,47294E-14 Aspherical surface (7th lens surface) K"-0,003783,A4" 2.46077E-
6, As”-1,01729E-8゜Aa” 4.46
488E-11, At. =1.33827E-12 Aspherical surface (8th lens surface) K” 0.809892.A4”-1,65103E-
7, AI,”-1,32888E-9°Aa mini-,3
3671E-11, At. =1.35441E-13 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　　　　ｒｓ　　　　ｄｔ　　　
　ｊ　　　ｎｊ’Ｓ’　Ｊｌ　　　１９．５１３　７．
０８３　　１　１．８１６００　４６．６２２　　１０
９．０３０　２．３２１　　２　１．８４６６６　２３
．８９３　　３８．８５０　０．１００４　　１４．０２４　２．５８７　　３　１．８４６６
６　２３．８９５”　　　９Ｊ７２　１０．１０２６　　−１０．６０１　２．５８０　　４　１．８４６
６６　２３．８９７’　　−１４，８８５０，１００８宰　　−１０７，６５５２，０１１５１，８４６６６
２３，８９９２２６，５７８５，３２５６１，８１６０
０４８，６２１０−１９，９６１２７，９２６１１ｃ−）　　　０．７００　　７　１．５１６３３　
６４．１５１２　　　　（Ｘ）非球面（第５レンズ面）Ｋ＝　０．０１６８０５．Ａ４＝　３．９０２５７Ｅ−
６，Ａ、＝　５．４２７９５Ｅ−８ＡＭ＝−４．７２１
０９Ｅ−１０，ＡＩ。＝　２．５２９３６Ｅ−１１非球
面（第７レンズ面）Ｋ＝−０，０１７００３，Ａ４＝　７．０６６９４Ｅ−
６，Ａ６＝−５，１０８２０Ｅ−８゜Ａ、＝　１．３４
１６６Ｅ−１０，ＡＩ。＝−５，４６２８８Ｅ−１２非
球面（第８レンズ面）Ｋ＝　３．５７５８２７．Ａ４＝−５，７６２０１Ｅ−
７，ＡＳ＝−１，６０４９８Ｅ−８゜Ａａ”４．５５９
７６Ｅ−１０，ＡＩ。＝　１．０３５８９Ｅ−１２実施
例１４Ｆ：４３．ＦＮ０＝３．０，２ω：４０２ｍ＝０．１１
０２ｉ　　　　ｒ１ｄ＋　　　　Ｊ　　　ｎｊｌ　　　
１８．９３１　６．００９　　１　１．７２９１６　５
４．６８２　　１１０．４５８　２．０９９　　２　１
．７８４７２　２５．７１３　　４３．３５９　０．１
００４　　１３．３９５　３．０３５　　３　１．８４６６
６　２３．８９５”　　　９，５９２　９．９８６６　　−１０．２７０　３．１０１　　４　１．７４０
７７　２７．７９７’　　−１４，８５８０，１００８’　　−１１８，６２５１，０００５１，６８８９３
３１，０８９　　　　９２．２５７　　５．５４９　　
　　６　１．７２９１６　５４．６８１０　　−１９．
５９４　２８．３７４１１　　　　０ｏ　　　　Ｏ，７
００７１，５１６３３６４，１５１２００非球面（第５レンズ面）Ｋ＝　０．００６４８０．Ａ４＝　１．４７３４０Ｅ−
６，Ａ６＝　３．５９０４９Ｅ−８Ａ、ニー１．２５２
５４Ｅ−９、Ａ□。＝　１．６５０１１Ｅ−１１非球面
（第７レンズ面）Ｋ”−０，０１３０９０ｊ４”　８．８４０９１Ｅ−６
，Ａｓ”−５，７６７７８Ｅ−８゜Ａ１１＝　１．７８
１２２Ｅ−１１−Ａｘ。＝−３，６５４２３Ｅ−１２非
球面（第８レンズ面）Ｋ＝　９．８２４８８１．Ａ、＝−１，２４４３３Ｅ−
６，Ａ、＝−１，７８４０５Ｅ−８゜Ａ、＝−１，３５
３６８Ｅ−１０，ＡＩ。＝　１．０１３１８Ｅ−１２実
施例１５Ｆ＝４３．ＦＮ０＝３．０，２ω＝４０９ｍ＝０．１１
０２１　　　　ｒｌ　　　　ｄｔ　　　　ｊ　　　ｎ４
　　　ν１１　　１９．１０７　７．０４４　　１　１
．８１６００　４Ｂ、６０２　　１１７．２３９　２．
１５７　　２　１．８４２２２　２４．０２３　　３４
．９５２　０．３３８４　　１３．２４３　２．３２１　　３　１．８４７０
０　２３．９０５’　　　　　９．８３６　１０．０９
５６　　　　−９．０１７　　１．９１３　　　　４　
１．８４７００　２：１９０７”　　　−１１，６３４
０，４２４８″　　−８４，９０５２，２３１５１，８３１８５２
４，３０９１４０，６８５５，５７９６１，８１８７８
４５，９７１０−２０，３９３２７，４７４１１ｏ３　　　０．７００　　　　７　１．５１６３３
　６４．１５１２　　　　　００非球面（第５レンズ面）Ｋ＝　０．００２８００．Ａ、＝　１．０２３４５Ｅ−
６，Ａ６＝−１，５５８２４Ｅ−８゜Ａｊ＝−４，４４
８３９Ｅ−１０，Ａ、。、　７．３１１８８Ｅ−１２非
球面（第７レンズ面）Ｋ＝−０，００３７２７，Ａ、＝　２．４０５０８Ｅ−
８，Ａ６＝−８，１４９７４Ｅ−９Ａａ＝　３．７０９
１３Ｅ−１１，Ａ□。＝　８．２５４０３Ｅ−１３非球
面（第８レンズ面）Ｋ：０．６３０８３３．Ａｎ”−１，２８６ＺＩＥ−７
，Ａｓ”−１，０４３７８Ｅ−９゜Ａｌｌ”−１，１９
６４６Ｅ−１１−Ａｌ。＝　１．２８３９５Ｅ−１３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 rs dt
j nj'S' Jl 19.513 7.
083 1 1.81600 46.622 10
9.030 2.321 2 1.84666 23
．． 893 38.850 0.100 4 14.024 2.587 3 1.8466
6 23.895" 9J72 10.102 6 -10.601 2.580 4 1.846
66 23.897' -14,8850,100 8 times -107,6552,01151,84666
23,899226,5785,32561,8160
048,6210-19,96127,926 11c-) 0.700 7 1.51633
64.1512 (X) Aspherical surface (fifth lens surface) K= 0.016805. A4 = 3.90257E-
6, A, = 5.42795E-8AM = -4.721
09E-10, AI. = 2.52936E-11 Aspherical surface (7th lens surface) K=-0,017003, A4= 7.06694E-
6, A6=-5, 10820E-8°A, = 1.34
166E-10, AI. =-5,46288E-12 Aspherical surface (8th lens surface) K=3.575827. A4=-5,76201E-
7, AS=-1,60498E-8゜Aa"4.559
76E-10, AI. = 1.03589E-12 Example 14 F:43. FN0=3.0, 2ω:402m=0.11
02i r1d+ J njl
18.931 6.009 1 1.72916 5
4.682 110.458 2.099 2 1
．． 78472 25.713 43.359 0.1
00 4 13.395 3.035 3 1.8466
6 23.895" 9,592 9.986 6 -10.270 3.101 4 1.740
77 27.797' -14,8580,100 8' -118,6251,00051,68893
31,089 92.257 5.549
6 1.72916 54.6810 -19.
594 28.37411 0o O,7
0071,5163364,151200 Aspherical surface (fifth lens surface) K= 0.006480. A4 = 1.47340E-
6, A6 = 3.59049E-8A, knee 1.252
54E-9, A□. = 1.65011E-11 Aspherical surface (7th lens surface) K"-0,013090j4" 8.84091E-6
, As”-5,76778E-8°A11= 1.78
122E-11-Ax. =-3,65423E-12 aspherical surface (8th lens surface) K=9.824881. A, =-1,24433E-
6,A,=-1,78405E-8°A,=-1,35
368E-10, AI. = 1.01318E-12 Example 15 F=43. FN0=3.0, 2ω=409m=0.11
021 rl dt j n4
ν11 19.107 7.044 1 1
．． 81600 4B, 602 117.239 2.
157 2 1.84222 24.023 34
．． 952 0.338 4 13.243 2.321 3 1.8470
0 23.905' 9.836 10.09
56 -9.017 1.913 4
1.84700 2:1907" -11,634
0,424 8″ -84,9052,23151,831852
4,309140,6855,57961,81878
45,9710-20,39327,474 11o3 0.700 7 1.51633
64.1512 00 Aspherical surface (fifth lens surface) K= 0.002800. A, = 1.02345E-
6, A6=-1,55824E-8゜Aj=-4,44
839E-10,A. , 7.31188E-12 Aspherical surface (7th lens surface) K=-0,003727,A,=2.40508E-
8,A6=-8,14974E-9Aa=3.709
13E-11, A□. = 8.25403E-13 Aspherical surface (8th lens surface) K: 0.630833. An”-1,286ZIE-7
,As"-1,04378E-9゜All"-1,19
646E-11-Al. = 1.28395E-13 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.

［発明の効果コ以上、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２０
度と広画角で、７１．４本／ｍｍ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ＦＮ
ｏ＝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 20
degree and wide angle of view, has sufficiently high contrast even at high spatial frequencies of 71.4 lines/mm, and has brightness of FN.
It is bright with o=3 and has a sufficiently high aperture efficiency.

[Brief explanation of the drawing]

第１図は１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１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７１７、Ｖ７氾４因（すＣか芒イ列　３ン −０，２０００，２０球面目スフ「 −０，２０００，’ｌＯ非卓、ｔ、＋Ｘ差五曲状先（幻フマｔ、＋Ｘ及Ｚ（実ｉイ列ｅン −０，２０００，２０球面収差一０乏θ　　Ｑ　　　α２０非点状迄 −０，２００α２０歪１曲目ヌ惹（’ｌ）フマｌ、Ｉｘ息４７一蔦８因（実施４刊ワ）亮図（す（施イダ］　８　）球面Ｌ４Ｘ’差非廣、１ヌ鼻４８− 篤４？ ■ （実２庁巳イ列　４イ　）方４′Ｊ３閃（実施イタリ　イ？）Ｙ＝１５２．４ −０．２０　　０　　０．２０　−０．π　　ＯＯ，２
０球面目４Ｘ息　　非点ｌＸ及歪曲ＵＸ先（ｙ、）フマＬＩＸ’息処４５図（実施４列イ４）コマ数基５１−FIG. 1 is a diagram for explaining the lens configuration of the present invention, and FIGS. 2 to 16 are aberration diagrams for each example. 10., first lens, 12. ,, second lens, 14.
,, third lens, 15. ,,Aperture,16. , 4th lens, 18. ,, No. 717, V7 Flood 4 cause (S C or A A row 3-0,2000,20 Spherical eye Sufu "-0,2000,'lO Non-table, t, +X difference pentagonal point (phantom fuma t , + 8 Cause (Implementation 4th issue) Ryozu (Su (Seida) 8) Spherical surface L4X' difference Hiro, 1 dog nose 48- Atsushi 4? Implementation I?) Y=152.4 -0.20 0 0.20 -0.π OO,2
0 sphere 4X breath Astigmatism lX and distortion UX destination (y,) Huma LIX' breath 45 Figure (implementation 4 rows A 4) Number of frames 51-

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. 5, 6th, and 7th lens surfaces are aspherical surfaces, and the conic constants K_5 and K_6 of these aspherical surfaces are
, K_7 is (1-I)0.0<K_5<0.02 (1-II)-0.005<K_6<0.005(1-I
II) -0.01<K_7<0.0 A scanner reading lens having a configuration of 7 elements in 5 groups, characterized by satisfying the following condition: -0.01<K_7<0.0. 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 which is a positive lens cemented to the image side of the fifth lens; The 8th lens surface is an aspherical surface, and the conic constants K_5 and K_6 of these aspherical surfaces are
, K_8 satisfies the following conditions: (2-I)0.0<K_5<0.03 (2-II)0.0<K_6<0.03 (2-III)0.5<K_8<3.5 A reading lens for scanners consisting of 7 elements in 5 groups. 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. a sixth lens which is a positive lens cemented to the image side of the fifth lens; The tenth lens surface is an aspherical surface, and the conic constants K_5, K_ of these aspherical surfaces are
6. Set the condition that K_1_0 is (3-I)0.0<K_5<0.03 (3-II)0.01<K_6<0.03 (3-III)0.0<K_1_0<0.02 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.The fifth group is a seventh lens which is a parallel plane glass, and counting from the object side, the first, seventh, and The 8th lens surface is an aspherical surface, and the conic constants K_1 and K_7 of these aspherical surfaces are
, K_8 is (4-I)-0.025<K_1<0.0 (4-II)-0.02<K_7<0.0 (4-III)0.0<K_8<12.0 A reading lens for scanners consisting of 7 elements in 5 groups, which satisfies the following. 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.The fifth group is a seventh lens which is a parallel plane glass, and counting from the object side, the fifth lens, seventh lens, and The eighth lens surface is an aspherical surface, and the conic constants of these aspherical surfaces are K_5 and K_7.
, K_8 is (5-I)0.0<K_5<0.018 (5-II)-0.018<K_7<0.0 (5-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.