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JP3284784B2 - Zoom lens - Google Patents

Zoom lens

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Publication number
JP3284784B2
JP3284784B2 JP25134594A JP25134594A JP3284784B2 JP 3284784 B2 JP3284784 B2 JP 3284784B2 JP 25134594 A JP25134594 A JP 25134594A JP 25134594 A JP25134594 A JP 25134594A JP 3284784 B2 JP3284784 B2 JP 3284784B2
Authority
JP
Japan
Prior art keywords
lens
group
refractive power
negative
positive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP25134594A
Other languages
Japanese (ja)
Other versions
JPH0886964A (en
Inventor
宏志 遠藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to JP25134594A priority Critical patent/JP3284784B2/en
Priority to US08/404,330 priority patent/US5710669A/en
Publication of JPH0886964A publication Critical patent/JPH0886964A/en
Application granted granted Critical
Publication of JP3284784B2 publication Critical patent/JP3284784B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【産業上の利用分野】本発明は35mmフィルム用の写
真カメラや電子記録方式のビデオカメラ、そしてSVカ
メラ等に好適なズームレンズに関し、特に負の屈折力の
レンズ群が先行する全体として4つのレンズ群を有し、
これら4つのレンズ群のレンズ構成を適切に設定するこ
とによりレンズ系全体の小型化を図った変倍比2、Fナ
ンバー2.9、広角端の撮影画角100°程度のネガテ
ィブリード型のズームレンズに関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom lens suitable for a photographic camera for 35 mm film, a video camera of an electronic recording system, an SV camera, and the like. It has a lens group,
By appropriately setting the lens configuration of these four lens groups, the size of the entire lens system is reduced. A negative lead type zoom having a zoom ratio of 2, an F number of 2.9, and a shooting angle of view of about 100 ° at the wide-angle end. It is about a lens.

【0002】[0002]

【従来の技術】従来より負の屈折力のレンズ群が先行す
る所謂ネガティブリード型のズームレンズは広画角化が
比較的容易であるため撮影画角90°以上を有する広画
角のズームレンズには多く用いられている。
2. Description of the Related Art Conventionally, a so-called negative lead type zoom lens which is preceded by a lens group having a negative refractive power has a wide angle of view. Is often used.

【0003】このような広画角用のズームレンズが例え
ば特開平2−201310号公報,特開平2−2962
08号公報,特開平4−235514号公報,特開平4
−235515号公報で提案されている。これらに提案
されているズームレンズは、物体側から順に負,正,
負,そして正の屈折力の4つのレンズ群より構成してい
る。
[0003] Such a wide-angle zoom lens is disclosed in, for example, Japanese Patent Application Laid-Open Nos. Hei 2-201310 and Hei 2-2962.
08, JP-A-4-235514, JP-A-4-235
No. 235515. These proposed zoom lenses are negative, positive,
It comprises four lens groups of negative and positive refractive power.

【0004】この他、特公昭49−23912号公報や
特開昭57−163213号公報等では物体側より順に
負の屈折力の第1群、正の屈折力の第2群、負の屈折力
の第3群、そして正の屈折力の第4群の4つのレンズ群
を有し、広角端から望遠端への変倍に際して第1群を像
面側へ移動させ、第2群と第4群を物体側へ移動させ、
第3群を固定若しくは移動させた広画角のズームレンズ
を提案している。
In addition, JP-B-49-23912 and JP-A-57-163213 disclose a first group of negative refractive power, a second group of positive refractive power, and a negative refractive power in order from the object side. The third lens unit has a fourth lens unit having a positive refractive power, and the fourth lens unit has a positive refractive power. The first lens unit is moved to the image plane side during zooming from the wide-angle end to the telephoto end. Move the group to the object side,
A wide-angle zoom lens in which the third lens unit is fixed or moved has been proposed.

【0005】[0005]

【発明が解決しようとする課題】近年、一眼レフカメラ
やビデオカメラ等には広画角のズームレンズが要望され
ている。
In recent years, zoom lenses having a wide angle of view have been demanded for single-lens reflex cameras, video cameras and the like.

【0006】一般にネガティブリード型のズームレンズ
において、所定のバックフォーカスを確保しつつ、例え
ば広角端の撮影画角100°程度、変倍比2程度、広角
端のFナンバー3程度を確保しつつ、全変倍範囲にわた
り良好なる光学性能を得るには各レンズ群の屈折力配置
を適切に設定する必要がある。各レンズ群の屈折力配置
やレンズ構成が不適切であるとレンズ枚数を増加させて
も変倍に伴う収差変動が大きくなり、全変倍範囲にわた
り高い光学性能を得るのが難しくなってくる。
In general, in a negative lead type zoom lens, for example, a photographic field angle of about 100 ° at the wide-angle end, a zoom ratio of about 2 and an F-number of about 3 at the wide-angle end while securing a predetermined back focus. In order to obtain good optical performance over the entire zoom range, it is necessary to appropriately set the refractive power arrangement of each lens group. If the refractive power arrangement or the lens configuration of each lens group is inappropriate, even if the number of lenses is increased, the aberration variation accompanying zooming becomes large, and it becomes difficult to obtain high optical performance over the entire zoom range.

【0007】本発明は、負の屈折力のレンズ群が先行す
るネガティブリード型の全体として4つのレンズ群より
成るズームレンズにおいて、各レンズ群の屈折力やレン
ズ構成を適切に設定することにより、所定のバックフォ
ーカスを有しつつ、広角端の撮影画角100°、変倍比
2、Fナンバー2.9程度の全変倍範囲にわたり高い光
学性能を有したズームレンズの提供を目的とする。
According to the present invention, in a negative lead type zoom lens in which a lens unit having a negative refractive power is preceded by four lens units as a whole, by appropriately setting the refractive power and the lens configuration of each lens unit, It is an object of the present invention to provide a zoom lens having a predetermined back focus and high optical performance over the entire zoom range of about 100 ° at a wide angle end, a zoom ratio of 2, and an F number of about 2.9.

【0008】[0008]

【課題を解決するための手段】請求項1の発明のズーム
レンズは物体側より順に負の屈折力の前群と正の屈折力
の後群とから成り、該前群は負の屈折力の第1群の1つ
のレンズ群より成り、該後群は正の屈折力の第2群、負
の屈折力の第3群、そして正の屈折力の第4群の3つの
レンズ群を有し、各レンズ群の空気間隔を変えて変倍を
行い、該第4群は正の屈折力の第41成分、像面側に強
い負の屈折面を向けたメニスカス状の負の第421レン
ズより成る第42成分、そして正の屈折力の第43成分
の3つの成分を有すると共にレンズ中心からレンズ周辺
にいくに従い正の屈折力が弱くなる形状の少なくとも1
つの非球面を有し、広角端と望遠端における第i群と第
i+1群の間隔を各々DiW,DiT、広角端における
光学全長と全系の焦点距離を各々TLW,fW、広角端
から望遠端への変倍に伴う該第i群の移動量(但し像面
側へ移動するときをプラス、物体側へ移動するときをマ
イナス符号とする。)をMi、該第i群の焦点距離をf
i、望遠端における全系の焦点距離をfT、広角端にお
いて該第1群の最も物体側のレンズ面から該第3群の最
も物体側のレンズ面までの光軸方向の長さをLSP、該
非球面の光線有効径をEA、該非球面の面頂点から光線
有効径位置までの光軸方向の距離をX、該非球面の近軸
曲率成分のみの球面を想定したときの面頂点から光線有
効径位置までの光軸方向の距離をX0とするとき D1T<D1W ・・・(イ) D2W<D2T ・・・(ロ) D3T<D3W ・・・(ハ) 6<TLW/fW<10 ・・・(1) −0.3<M1/M2<0.3 ・・・(2) 0.005<|X−X0 |/EA<0.05 ・・・(3) 1.5<f4/fW<3 ・・・(4) 0.7<f4/fT<1.8 ・・・(5) 0.37<LSP/TLW<0.47 ・・・(6) 0.4<M3/M2<0.7 ・・・(7) なる条件を満足することを特徴としている。
The zoom lens according to the present invention comprises, in order from the object side, a front group having a negative refractive power and a rear group having a positive refractive power. The front group has a negative refractive power. The rear group has three lens groups, a second group having a positive refractive power, a third group having a negative refractive power, and a fourth group having a positive refractive power. The fourth unit is changed from the meniscus negative 421 lens having a strong negative refraction surface facing the image surface side by changing the air spacing of each lens unit to perform zooming. And at least one of the shapes having a positive refractive power that decreases from the center of the lens toward the periphery of the lens.
The distance between the i-th lens unit and the (i + 1) -th lens unit at the wide-angle end and the telephoto end is DiW and DiT, respectively, the total optical length at the wide-angle end and the focal length of the entire system are TLW and fW, respectively. The amount of movement of the i-th unit accompanying zooming to (the plus sign when moving toward the image plane and the minus sign when moving toward the object side) is Mi, and the focal length of the i-th lens unit is f.
i, the focal length of the entire system at the telephoto end is fT, and the length in the optical axis direction from the lens surface closest to the object side of the first group to the lens surface closest to the object side of the third group at the wide-angle end is LSP. The effective ray diameter of the aspheric surface is EA, the distance in the optical axis direction from the surface vertex of the aspheric surface to the ray effective diameter position is X, and the effective ray diameter from the surface vertex assuming a spherical surface having only the paraxial curvature component of the aspheric surface. D1T when the distance in the optical axis direction to the position as X 0 <D1W ··· (b) D2W <D2T ··· (b) D3T <d3W ··· (c) 6 <TLW / fW <10 ·· (1) -0.3 <M1 / M2 <0.3 (2) 0.005 <| XX- 0 | / EA <0.05 (3) 1.5 <f4 / fW <3 (4) 0.7 <f4 / fT <1.8 (5) 0.37 <LSP / TLW <0.47 ... (6) is characterized by satisfying 0.4 <M3 / M2 <0.7 ··· (7) following condition.

【0009】[0009]

【実施例】図1〜図9は本発明の数値実施例1〜9の広
角端におけるレンズ断面図である。図中、LFは負の屈
折力の前群、LRは正の屈折力の後群、SPは開口絞
り、SKはフレアーカット用の固定絞り、SVはフレア
ーカット用の変倍に伴い移動するフレアー絞りである。
1 to 9 are lens sectional views at the wide-angle end of Numerical Examples 1 to 9 of the present invention. In the drawing, LF is a front group having a negative refractive power, LR is a rear group having a positive refractive power, SP is an aperture stop, SK is a fixed stop for flare cut, and SV is a flare that moves with zooming for flare cut. Aperture.

【0010】本実施例1では、前群LFを負の屈折力の
第1群L1より構成している。第1群L1は負の屈折力
の第11群L11と負の屈折力の第12群L12の2つ
のレンズ群より構成し、該第12群L12を光軸上移動
させてフォーカスを行っている。(尚、本実施例におい
ては第1群L1全体を移動させてフォーカスを行っても
良い。)又、後群LRを正の屈折力の第2群L2、負の
屈折力の第3群L3、正の屈折力の第4群L4の3つの
レンズ群より構成している。
In the first embodiment, the front unit LF is constituted by the first unit L1 having a negative refractive power. The first lens unit L1 includes two lens units, an eleventh lens unit L11 having a negative refractive power and a twelfth lens unit L12 having a negative refractive power. The twelfth lens unit L12 is moved on the optical axis to perform focusing. . (In this embodiment, focusing may be performed by moving the entire first unit L1.) Further, the rear unit LR is replaced by a second unit L2 having a positive refractive power and a third unit L3 having a negative refractive power. , And a fourth lens unit L4 having a positive refractive power.

【0011】図中、矢印は広角端から望遠端への変倍に
際して、各レンズ群の移動軌跡を示している。
In the drawing, arrows indicate the movement trajectories of the respective lens units when changing the magnification from the wide-angle end to the telephoto end.

【0012】即ち、広角端から望遠端への変倍は、前述
の条件式(イ),(ロ),(ハ)を満足するように、第
1群L1と第2群L2との間隔が減小し、第2群L2と
第3群L3との間隔が増大し、第3群L3と第4群L4
との間隔が減小するように、各レンズ群を光軸上移動さ
せて行なっている。
That is, in the zooming from the wide-angle end to the telephoto end, the distance between the first lens unit L1 and the second lens unit L2 is set so as to satisfy the above-mentioned conditional expressions (A), (B) and (C). The distance between the second lens unit L2 and the third lens unit L3 increases, and the distance between the third lens unit L3 and the fourth lens unit L4 increases.
Each lens group is moved on the optical axis so as to reduce the distance between the lens groups.

【0013】具体的には広角端から望遠端への変倍に際
し、第2群と第4群を一体的に物体側方向へ移動させ、
第3群を独立に物体側方向へ移動させ、第1群は広角端
から中間焦点距離までは像面側に、中間焦点距離から望
遠端までは物体側に移動させている。又第2,第4群の
移動を直線移動(ズーム操作量に比例して移動したと
き)、第3群は非直線移動させることで、中間焦点距離
での収差を良好に補正している。尚後述する数値実施例
2においては第1群L1の第11群L11と第12群L
12とのレンズ群間隔が変倍に際して中間焦点距離にお
いて最も広くなるように第11レンズ群L11又は第1
2レンズ群L12の少なくとも一方のレンズ群を移動さ
せている。
Specifically, upon zooming from the wide-angle end to the telephoto end, the second and fourth units are moved integrally toward the object side,
The third lens unit is moved independently toward the object side, and the first lens unit is moved toward the image plane from the wide-angle end to the intermediate focal length, and toward the object side from the intermediate focal length to the telephoto end. In addition, the second and fourth groups are moved linearly (when moved in proportion to the zoom operation amount), and the third group is moved non-linearly, so that aberrations at the intermediate focal length can be corrected well. In Numerical Example 2 to be described later, the eleventh lens unit L11 and the twelfth lens unit L of the first lens unit L1 are used.
The eleventh lens unit L11 or the first lens unit L11 is designed such that the distance between the first lens unit L11 and the second lens unit 12 becomes the largest at the intermediate focal length during zooming.
At least one of the two lens units L12 is moved.

【0014】本実施例では後群LRを3つのレンズ群で
構成し、変倍に際して各レンズ群を前述の如く光軸上移
動させることにより、後群LRの主点位置が広角端から
望遠端への変倍に際して像面側から物体側へ移動させて
いる。これにより前群LFと後群LRによる変倍効果を
大きくして、所定の変倍比を効果的に得ている。
In this embodiment, the rear unit LR is composed of three lens units, and each lens unit is moved on the optical axis during zooming as described above, so that the principal point of the rear unit LR is shifted from the wide-angle end to the telephoto end. When changing the magnification to, the lens is moved from the image plane side to the object side. Thereby, the zooming effect by the front group LF and the rear group LR is increased, and a predetermined zooming ratio is effectively obtained.

【0015】第4群の正の屈折力の第41成分を図1,
図2では両レンズ面が凸面の正レンズと像面側に凸面を
向けたメニスカス状の負レンズとを接合した貼合わせレ
ンズより、図3では両レンズ面が凸面の正レンズと像面
側に凸面を向けたメニスカス状の負レンズの2つのレン
ズより、図4では正レンズ、そして正レンズと像面側に
凸面を向けたメニスカス状の負レンズとを接合した貼合
わせレンズより、図5〜図9では2つの正レンズと負レ
ンズの3つのレンズを接合した貼合わせレンズより構成
している。
The fourth component of the positive refractive power of the fourth unit is shown in FIG.
FIG. 2 shows a cemented lens in which a positive lens having both convex surfaces and a meniscus-shaped negative lens having a convex surface facing the image surface are joined. From the two lenses of the meniscus-shaped negative lens having a convex surface, the positive lens in FIG. 4 and the bonded lens in which the positive lens and the meniscus-shaped negative lens having the convex surface directed to the image surface side are joined are shown in FIGS. FIG. 9 shows a laminated lens in which three lenses, two positive lenses and a negative lens, are joined.

【0016】本実施例では第41成分中に正レンズと負
レンズの2つのレンズを設けることにより軸外光束が最
も光軸から外側を通過することを利用して倍率色収差の
補正を効果的に行っている。
In this embodiment, by providing two lenses, a positive lens and a negative lens, in the forty-first component, it is possible to effectively correct lateral chromatic aberration by utilizing the fact that an off-axis light beam passes the outermost from the optical axis. Is going.

【0017】負の屈折力の第42成分を像面側に凹面を
向けたメニスカス状の単一の負の第421レンズより構
成している。正の屈折力の第43成分を正レンズ(第4
31レンズ)と物体側に凹面を向けたメニスカス状の負
レンズ(第432レンズ)とを接合した貼合わせレンズよ
り構成している。第4群中の最も像面側のレンズ面には
レンズ中心からレンズ周辺にいくに従って正の屈折力が
弱くなる形状の非球面を用いている。
The forty-second component of the negative refractive power is constituted by a single negative meniscus 421 lens having a concave surface facing the image plane side. The 43rd component of positive refracting power is
31 lens) and a meniscus negative lens (432rd lens) having a concave surface facing the object side. As the lens surface closest to the image plane in the fourth lens unit, an aspheric surface having a shape in which the positive refractive power becomes weaker from the lens center to the lens periphery is used.

【0018】以上のように比較的正の屈折力の強い第4
群のレンズ構成を前述の如く構成することにより球面収
差、非点収差、像面湾曲をバランス良く補正している。
また広角側で発生する高次の像面湾曲を第4群中の最も
像面側の非球面により良好に補正している。そして第2
群L2をメニスカス状の負レンズと正レンズを接合した
貼合わせレンズ、そして正レンズで構成し、これにより
諸収差を良好に補正している。
As described above, the fourth lens having a relatively strong positive refractive power is used.
The spherical aberration, astigmatism, and field curvature are corrected in a well-balanced manner by configuring the lens configuration of the group as described above.
Higher-order field curvature occurring on the wide-angle side is favorably corrected by the aspherical surface closest to the image plane in the fourth lens unit. And the second
The group L2 is composed of a cemented lens in which a meniscus-shaped negative lens and a positive lens are cemented, and a positive lens, whereby various aberrations are satisfactorily corrected.

【0019】更に第1群中にレンズ中心からレンズ周辺
にいくに従って正の屈折力が強くなる形状の非球面を用
いることにより広角側で発生する樽型の歪曲を補正し、
最も物体側のレンズを像面側に凹面を向けたメニスカス
状の負レンズとして第1群のレンズ外径を小さくしてい
る。また最終レンズ群の像面側に変倍時固定のフレアー
カット絞りSKを置くことで望遠側でのフレアーを除去
している。
Further, barrel distortion generated on the wide-angle side is corrected by using an aspheric surface having a shape in which the positive refractive power increases from the center of the lens toward the periphery of the lens in the first lens unit.
The lens on the most object side is a meniscus negative lens with the concave surface facing the image plane side, and the outer diameter of the lens of the first group is reduced. A flare on the telephoto side is removed by placing a flare cut stop SK fixed at the time of zooming on the image plane side of the last lens unit.

【0020】図4〜図9の数値実施例4〜9では第3群
の像面側に第3群と一体に移動し、焦点距離に応じて口
径の変化するフレアーカット絞りSVを置くことにより
広角側での画面中間部のフレアーを除去している。
In the numerical examples 4 to 9 shown in FIGS. 4 to 9, the flare cut stop SV, which moves integrally with the third lens unit on the image plane side of the third lens unit and whose aperture varies according to the focal length, is placed. The flare in the middle of the screen on the wide-angle side has been removed.

【0021】本実施例では、このように各レンズ群の屈
折力や変倍における各レンズ群の移動条件、そして各レ
ンズ群のレンズ構成を前述の如く適切に設定すると共に
条件式(1)を満足させることによりレンズ全長を短縮
しつつ、広画角でしかも全変倍範囲にわたり高い光学性
能を有したズームレンズを得ている。
In this embodiment, as described above, the refracting power of each lens unit, the moving condition of each lens unit during zooming, and the lens configuration of each lens unit are appropriately set as described above, and the conditional expression (1) is set. By satisfying these requirements, a zoom lens having a wide angle of view and high optical performance over the entire zoom range while shortening the entire length of the lens is obtained.

【0022】条件式(1)は広角端での光学全長(第1
レンズ面から像面までの距離)と広角端での全系の焦点
距離の比、所謂テレ比を規定するものであり、主に所望
のFナンバーとバックフォーカスを確保する為のもので
ある。条件式(1)の下限値を超えると所望のFナンバ
ーとバックフォーカスの確保が困難となり、又上限値を
超えると収差補正には有利であるが光学全長が増大する
ことになり好ましくない。
Conditional expression (1) represents the total optical length at the wide-angle end (first
This defines the ratio of the focal length of the entire system at the wide-angle end to the focal length of the entire system at the wide-angle end, that is, the so-called telephoto ratio, and is mainly for securing a desired F-number and back focus. Exceeding the lower limit of conditional expression (1) makes it difficult to secure the desired F-number and back focus. Exceeding the upper limit of the conditional expression (1) is advantageous for aberration correction, but undesirably increases the overall optical length.

【0023】[0023]

【0024】[0024]

【0025】条件式(2)は第1群と第2群の変倍の際
の移動量の比を規定し主にレンズ系をコンパクトにする
為のものである。条件式(2)は第1群で像面位置を補
正した場合、広角端から望遠端への変倍に際し、広角端
での位置を基準とし、中間焦点距離では第1群が像面側
に位置し、望遠端では広角端と略同じところに位置する
こと、即ち完全往復に近いことを表している。条件式
(2)の上限値を越えると、各レンズ群の焦点距離が短
くなり、コンパクト化には有利だが収差補正が困難とな
る。また下限値を越えると収差補正には有利だがレンズ
系が増大してくる。
Conditional expression (2) defines the ratio of the amount of movement during zooming between the first lens unit and the second lens unit, and is mainly used to make the lens system compact. When the image plane position is corrected by the first lens unit, the conditional expression (2) is based on the position at the wide-angle end when zooming from the wide-angle end to the telephoto end. At the telephoto end, it is located at substantially the same position as the wide-angle end, that is, it is close to complete reciprocation. If the upper limit of conditional expression (2) is exceeded, the focal length of each lens unit will be short, which is advantageous for compactness but makes it difficult to correct aberrations. If the lower limit value is exceeded, it is advantageous for aberration correction, but the number of lens systems increases.

【0026】条件式(3)は第4群の最も像面側のレン
ズ面に施す非球面の非球面量を規定し、主に広角側にお
ける高次の像面湾曲、即ち周辺部でオーバーになろうと
する像面湾曲とサジタルフレアーを補正するものであ
る。条件式(3)は前記補正効果を十分なものとする為
のものである。
Conditional expression (3) defines the amount of aspherical surface of the aspherical surface to be applied to the lens surface closest to the image plane in the fourth lens unit. This is to correct the curvature of field and sagittal flare to be achieved. Conditional expression (3) is for making the correction effect sufficient.

【0027】条件式(4)は第4群の焦点距離と広角端
の全系の焦点距離の比を規定し、条件式(5)は第4群
の焦点距離と望遠端の全系の焦点距離の比を規定するも
のである。何れの条件式(4),(5)の下限値を越え
て第4群の焦点距離が短くなるとコンパクト化には有利
であるが、画面周辺の収差、特に像面湾曲が悪化する。
また何れの条件式(4),(5)の上限値を越えて第4
群の焦点距離が長くなると収差補正上は好ましいが、レ
ンズ系が大きくなり好ましくない。
Conditional expression (4) defines the ratio between the focal length of the fourth lens unit and the focal length of the entire system at the wide-angle end. Conditional expression (5) defines the focal length of the fourth lens unit and the focal length of the entire system at the telephoto end. This defines the distance ratio. If the focal length of the fourth lens unit becomes short beyond the lower limit of any of the conditional expressions (4) and (5), it is advantageous for downsizing, but aberrations around the screen, particularly field curvature, deteriorate.
In addition, when the value exceeds the upper limit of any of the conditional expressions (4) and (5), the fourth condition
A longer focal length of the group is preferable for aberration correction, but is not preferable because the lens system becomes large.

【0028】条件式(6)は第1群の最も物体側のレン
ズ面から第3群の最も物体側のレンズ面までの長さと広
角端での光学全長の比を規定し、主に第1群のレンズ外
径を小さくするものである。条件式(6)の下限値を越
えるとレンズ外径を小さくするには有利だが光学性能を
維持しつつ所望の変倍比を得るのが困難となる。また上
限値を越えると第1群のレンズ外径が増大してしまう。
Condition (6) defines the ratio of the length from the lens surface closest to the object side of the first lens unit to the lens surface closest to the object side of the third lens unit and the total optical length at the wide-angle end. This is to reduce the lens outer diameter of the group. Exceeding the lower limit of conditional expression (6) is advantageous for reducing the lens outer diameter, but makes it difficult to obtain a desired zoom ratio while maintaining optical performance. If the upper limit is exceeded, the outer diameter of the first lens unit will increase.

【0029】条件式(7)は変倍に伴う第2群と第3群
の移動量の比を規定し、主に収差補正とコンパクト化を
両立させるものである。条件式(7)の下限値を越えて
第3群の移動量が第2群の移動量に対して小さくなると
完全往復タイプからはずれることになり好ましくない。
また上限値を越えると多群化した効果が小さくなり、コ
ンパクト化が困難となる。
Conditional expression (7) defines the ratio of the amount of movement between the second lens unit and the third lens unit during zooming, and is intended mainly to achieve both aberration correction and compactness. If the amount of movement of the third lens group becomes smaller than the amount of movement of the second lens group beyond the lower limit value of conditional expression (7), it is unpreferable because it deviates from the complete reciprocating type.
On the other hand, when the value exceeds the upper limit, the effect of multi-grouping is reduced, and it is difficult to make the device compact.

【0030】更に広角端での撮影画角が100°程度と
広画角化を図りつつ、全変倍範囲にわたり、かつ画面全
体にわたり、高い光学性能を確保するには次の条件のう
ち少なくとも1つを満足させるのが良い。(1−1)物
体側より順に前記第2群は像面側に凹面を向けたメニス
カス状の負の第21レンズ、正の第22レンズ、そして
正の第23レンズを有し、該第21レンズの材質の屈折
率とアッベ数を各々N21,ν21としたとき 1.7<N21 ・・・(8) 30<ν21 ・・・(9) なる条件を満足することである。
In order to secure a high optical performance over the entire zoom range and over the entire screen while achieving a wide angle of view of about 100 ° at the wide-angle end, at least one of the following conditions is required. It is good to satisfy one. (1-1) In order from the object side, the second unit includes a meniscus negative twenty-first lens, a positive twenty-second lens, and a positive twenty-third lens with the concave surface facing the image plane side. Assuming that the refractive index and Abbe number of the lens material are N21 and ν21, respectively, the following condition is satisfied: 1.7 <N21 (8) 30 <ν21 (9)

【0031】条件式(8),(9)は第2群の最も物体
側のメニスカス状の負の第21レンズの材質に低分散高
屈折率の材質を用いることにより軸上色収差、特に2次
スペクトルを良好に補正する為のものである。条件式
(8),(9)を外れると色収差の良好なる補正が難し
くなってくる。
Conditional expressions (8) and (9) indicate that the use of a material having a low dispersion and a high refractive index as the material of the negative meniscus lens element 21 on the most object side in the second group makes it possible to obtain axial chromatic aberration, especially second order. This is for correcting the spectrum well. If conditional expressions (8) and (9) are not satisfied, it becomes difficult to satisfactorily correct chromatic aberration.

【0032】(1−2)前記第432レンズの材質の屈
折率とアッベ数を各々N432,ν432としたとき 1.7<N432 ・・・(10) 30<ν432 ・・・(11) なる条件を満足することである。
(1-2) When the refractive index and Abbe number of the material of the 432rd lens are N432 and ν432, respectively, 1.7 <N432 (10) 30 <ν432 (11) Is to satisfy.

【0033】条件式(10),(11)は第4群の第4
3成分中の物体側に凹面を向けたメニスカス状の負の第
432レンズの材質に低分散高屈折率の材質を用いるこ
とにより軸上色収差を良好に補正する為のものである。
条件式(10),(11)を外れると軸上色収差の良好
なる補正が難しくなってくる。
The conditional expressions (10) and (11) satisfy the fourth group.
By using a material having a low dispersion and a high refractive index as the material of the meniscus negative 432 lens having the concave surface facing the object side in the three components, axial chromatic aberration can be satisfactorily corrected.
If conditional expressions (10) and (11) are not satisfied, it becomes difficult to satisfactorily correct axial chromatic aberration.

【0034】次に本発明の数値実施例を示す。数値実施
例においてriは物体側より第i番目のレンズ面の曲率
半径、diは第i番目のレンズ厚又は空気間隔、niと
νiは第i番目のレンズの材質の屈折率とアッベ数であ
る。又非球面形状はレンズ面の中心部の曲率半径をRと
し、光軸方向(光の進行方向)をX軸とし、光軸と垂直
方向をY軸とし、B,C,D,E,F,Gをそれぞれ非
球面係数としたとき、
Next, numerical examples of the present invention will be described. In the numerical examples, ri is the radius of curvature of the i-th lens surface from the object side, di is the i-th lens thickness or air gap, and ni and νi are the refractive index and Abbe number of the material of the i-th lens. . For the aspherical shape, the radius of curvature at the center of the lens surface is R, the optical axis direction (the traveling direction of light) is the X axis, the direction perpendicular to the optical axis is the Y axis, and B, C, D, E, F , G are aspherical coefficients, respectively.

【0035】[0035]

【数1】 で表されるものとする。尚、「e−x」の表記は「×1
-x」を表す。又前述の各条件式と数値実施例における
諸数値との関係を表−1に示す。
(Equation 1) It is assumed that The notation of “ex” is “× 1”.
0 -x ". Table 1 shows the relationship between the above-described conditional expressions and various numerical values in the numerical examples.

【0036】[0036]

【外1】 [Outside 1]

【0037】[0037]

【外2】 [Outside 2]

【0038】[0038]

【外3】 [Outside 3]

【0039】[0039]

【外4】 [Outside 4]

【0040】[0040]

【外5】 [Outside 5]

【0041】[0041]

【外6】 [Outside 6]

【0042】[0042]

【外7】 [Outside 7]

【0043】[0043]

【外8】 [Outside 8]

【0044】[0044]

【外9】 [Outside 9]

【0045】[0045]

【表1】 [Table 1]

【0046】[0046]

【発明の効果】本発明によれば以上のように、負の屈折
力のレンズ群が先行するネガティブリード型の全体とし
て4つのレンズ群より成るズームレンズにおいて、各レ
ンズ群の屈折力やレンズ構成を適切に設定することによ
り、所定のバックフォーカスを有しつつ、広角端の撮影
画角100°、変倍比2、Fナンバー2.9程度の全変
倍範囲にわたり高い光学性能を有したズームレンズを達
成することができる。
As described above, according to the present invention, in a zoom lens composed of four lens groups as a whole of a negative lead type in which a lens group having a negative refractive power is preceded, the refractive power and lens configuration of each lens group are described. By appropriately setting, a zoom having high optical performance over the entire zoom range of about 100 ° at the wide-angle end, a zoom ratio of 2, and an F-number of about 2.9 while having a predetermined back focus. A lens can be achieved.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の数値実施例1の広角端のレンズ断面図FIG. 1 is a sectional view of a lens at a wide angle end according to Numerical Embodiment 1 of the present invention.

【図2】本発明の数値実施例2の広角端のレンズ断面図FIG. 2 is a sectional view of a lens at a wide-angle end according to a second numerical embodiment of the present invention.

【図3】本発明の数値実施例3の広角端のレンズ断面図FIG. 3 is a sectional view of a lens at a wide-angle end according to a third numerical embodiment of the present invention;

【図4】本発明の数値実施例4の広角端のレンズ断面図FIG. 4 is a sectional view of a lens at a wide-angle end according to a fourth embodiment of the present invention.

【図5】本発明の数値実施例5の広角端のレンズ断面図FIG. 5 is a sectional view of a lens at a wide angle end according to Numerical Example 5 of the present invention.

【図6】本発明の数値実施例6の広角端のレンズ断面図FIG. 6 is a sectional view of a lens at a wide-angle end according to a sixth numerical embodiment of the present invention.

【図7】本発明の数値実施例7の広角端のレンズ断面図FIG. 7 is a sectional view of a lens at a wide-angle end according to a seventh numerical embodiment of the present invention.

【図8】本発明の数値実施例8の広角端のレンズ断面図FIG. 8 is a sectional view of a lens at a wide angle end according to Numerical Example 8 of the present invention.

【図9】本発明の数値実施例9の広角端のレンズ断面図FIG. 9 is a sectional view of a lens at a wide-angle end according to a ninth embodiment of the present invention.

【図10】本発明の数値実施例1の広角端の収差図FIG. 10 is an aberration diagram at a wide-angle end according to Numerical Embodiment 1 of the present invention.

【図11】本発明の数値実施例1の望遠端の収差図FIG. 11 is an aberration diagram at a telephoto end in Numerical Example 1 of the present invention;

【図12】本発明の数値実施例2の広角端の収差図FIG. 12 is an aberration diagram at a wide angle end according to Numerical Example 2 of the present invention.

【図13】本発明の数値実施例2の望遠端の収差図FIG. 13 is an aberration diagram at a telephoto end in Numerical Example 2 of the present invention.

【図14】本発明の数値実施例3の広角端の収差図FIG. 14 is an aberration diagram at a wide angle end according to Numerical Example 3 of the present invention.

【図15】本発明の数値実施例3の望遠端の収差図FIG. 15 is an aberration diagram at a telephoto end in Numerical Example 3 of the present invention.

【図16】本発明の数値実施例4の広角端の収差図FIG. 16 is an aberration diagram at a wide angle end according to Numerical Example 4 of the present invention.

【図17】本発明の数値実施例4の望遠端の収差図FIG. 17 is an aberration diagram at a telephoto end in Numerical Example 4 of the present invention.

【図18】本発明の数値実施例5の広角端の収差図FIG. 18 is an aberration diagram at a wide angle end according to Numerical Example 5 of the present invention.

【図19】本発明の数値実施例5の望遠端の収差図FIG. 19 is an aberration diagram at a telephoto end in Numerical Example 5 of the present invention.

【図20】本発明の数値実施例6の広角端の収差図FIG. 20 is an aberration diagram at a wide angle end according to Numerical Example 6 of the present invention.

【図21】本発明の数値実施例6の望遠端の収差図FIG. 21 is an aberration diagram at a telephoto end in Numerical Example 6 of the present invention.

【図22】本発明の数値実施例7の広角端の収差図FIG. 22 is an aberration diagram at a wide angle end according to Numerical Example 7 of the present invention.

【図23】本発明の数値実施例7の望遠端の収差図FIG. 23 is an aberration diagram at a telephoto end in Numerical Example 7 of the present invention.

【図24】本発明の数値実施例8の広角端の収差図FIG. 24 is an aberration diagram at a wide angle end in Numerical Example 8 of the present invention.

【図25】本発明の数値実施例8の望遠端の収差図FIG. 25 is an aberration diagram at a telephoto end in Numerical Example 8 of the present invention;

【図26】本発明の数値実施例9の広角端の収差図FIG. 26 is an aberration diagram at a wide angle end according to Numerical Example 9 of the present invention.

【図27】本発明の数値実施例9の望遠端の収差図FIG. 27 is an aberration diagram at a telephoto end in Numerical Example 9 of the present invention.

【符号の説明】 LF 前群 LR 後群 L1 第1群 L2 第2群 L3 第3群 L4 第4群 L11 第11群 L12 第12群 L41 第41成分 L42 第42成分 L43 第43成分 SP 開口絞り SK,SV フレアー絞り d d線 g g線 S.C 正弦条件 ΔS サジタル像面 ΔM メリディオナル像面[Description of Signs] LF Front Group LR Rear Group L1 First Group L2 Second Group L3 Third Group L4 Fourth Group L11 Eleventh Group L12 Twelfth Group L41 41st Component L42 42nd Component L43 43th Component SP Aperture Stop SK, SV Flare aperture d d line gg g line C Sine condition ΔS Sagittal image plane ΔM Meridional image plane

フロントページの続き (56)参考文献 特開 平4−235515(JP,A) 特開 平6−11650(JP,A) 特開 平6−180423(JP,A) 特開 平5−173071(JP,A) 特開 昭61−123811(JP,A) 特開 平7−152002(JP,A) 特開 平5−313065(JP,A) 特開 平5−313066(JP,A) 特開 平6−82698(JP,A) 特開 昭59−229517(JP,A) 特開 平7−261084(JP,A) 特開 平5−241073(JP,A) (58)調査した分野(Int.Cl.7,DB名) G02B 9/00 - 17/08 G02B 21/02 - 21/04 G02B 25/00 - 25/04 Continuation of the front page (56) References JP-A-4-235515 (JP, A) JP-A-6-11650 (JP, A) JP-A-6-180423 (JP, A) JP-A-5-173071 (JP JP-A-61-123811 (JP, A) JP-A-7-152002 (JP, A) JP-A-5-313065 (JP, A) JP-A-5-313066 (JP, A) 6-82698 (JP, A) JP-A-59-229517 (JP, A) JP-A-7-261084 (JP, A) JP-A-5-241073 (JP, A) (58) Fields investigated (Int. Cl 7, DB name) G02B 9/00 -. 17/08 G02B 21/02 - 21/04 G02B 25/00 - 25/04

Claims (5)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 物体側より順に負の屈折力の前群と正の
屈折力の後群とから成り、該前群は負の屈折力の第1群
の1つのレンズ群より成り、該後群は正の屈折力の第2
群、負の屈折力の第3群、そして正の屈折力の第4群の
3つのレンズ群を有し、各レンズ群の空気間隔を変えて
変倍を行い、該第4群は正の屈折力の第41成分、像面
側に強い負の屈折面を向けたメニスカス状の負の第42
1レンズより成る第42成分、そして正の屈折力の第4
3成分の3つの成分を有すると共にレンズ中心からレン
ズ周辺にいくに従い正の屈折力が弱くなる形状の少なく
とも1つの非球面を有し、広角端と望遠端における第i
群と第i+1群の間隔を各々DiW,DiT、広角端に
おける光学全長と全系の焦点距離を各々TLW,fW、
広角端から望遠端への変倍に伴う該第i群の移動量(但
し像面側へ移動するときをプラス、物体側へ移動すると
きをマイナス符号とする。)をMi、該第i群の焦点距
離をfi、望遠端における全系の焦点距離をfT、広角
端において該第1群の最も物体側のレンズ面から該第3
群の最も物体側のレンズ面までの光軸方向の長さをLS
P、該非球面の光線有効径をEA、該非球面の面頂点か
ら光線有効径位置までの光軸方向の距離をX、該非球面
の近軸曲率成分のみの球面を想定したときの面頂点から
光線有効径位置までの光軸方向の距離をX 0 とするとき D1T<D1W D2W<D2T D3T<D3W 6<TLW/fW<10−0.3<M1/M2<0.3 0.005<|X−X 0 |/EA<0.05 1.5<f4/fW<3 0.7<f4/fT<1.8 0.37<LSP/TLW<0.47 0.4<M3/M2<0.7 なる条件を満足することを特徴とするズームレンズ。
1. A lens unit comprising: a front group having a negative refractive power and a rear group having a positive refractive power in order from the object side; the front group includes one lens group of a first group having a negative refractive power; The group is the second with positive power
The zoom lens has three lens groups, a third group having a negative refractive power, and a fourth group having a positive refractive power, and performs zooming by changing the air spacing of each lens group. The 41st component of the refractive power, the meniscus-shaped negative 42nd surface with the strong negative refractive surface facing the image side
The 42nd component comprising one lens, and the 4th component having a positive refractive power
At least one aspheric surface having three components and having a shape in which the positive refractive power becomes weaker from the center of the lens to the periphery of the lens, and has an i-th surface at the wide-angle end and the telephoto end.
The distance between the lens unit and the (i + 1) -th lens unit is DiW and DiT, respectively, the total optical length at the wide-angle end and the focal length of the entire system are TLW and fW,
The movement amount of the i-th lens unit during zooming from the wide-angle end to the telephoto end (however,
Plus when moving to the image plane side, move to the object side
Is a minus sign. ) Is Mi, the focal length of the i-th lens unit
The separation is fi, the focal length of the entire system at the telephoto end is fT, and the wide angle is
At the end, the third lens unit is moved from the most object side lens surface to the third lens unit.
The length in the optical axis direction from the lens surface closest to the object side of the group is LS
P, the effective ray diameter of the aspherical surface is EA, is the surface vertex of the aspherical surface
X is the distance in the optical axis direction from the effective ray position to
From the surface vertex when assuming a spherical surface with only the paraxial curvature component of
When the distance in the optical axis direction to the effective beam diameter position is X 0 , D1T <D1W D2W <D2T D3T <D3W 6 <TLW / fW <10−0.3 <M1 / M2 <0.3 0.005 <| XX 0 | / EA <0.05 1.5 <f4 / fW <3 0.7 <f4 / fT <1.8 0.37 <LSP / TLW <0.47 0.4 <M3 / M2 < A zoom lens satisfying a condition of 0.7 .
【請求項2】 前記第41成分は正レンズと負レンズと
を接合した貼合わせレンズ、又は2つの正レンズと負レ
ンズとの3つのレンズを接合した貼合わせレンズを有
し、前記第43成分は正の第431レンズと物体側に凹
面を向けたメニスカス状の負の第432レンズとを接合
した貼合わせレンズを有していることを特徴とする請求
項1のズームレンズ。
2. The 43rd component has a cemented lens in which a positive lens and a negative lens are cemented or a cemented lens in which three lenses of two positive lenses and a negative lens are cemented. 2. The zoom lens according to claim 1, further comprising a cemented lens in which a positive 431 lens and a meniscus-shaped negative 432 lens having a concave surface facing the object side are joined.
【請求項3】 物体側より順に前記第2群は像面側に凹
面を向けたメニスカス状の負の第21レンズ、正の第2
2レンズ、そして正の第23レンズを有し、該第21レ
ンズの材質の屈折率とアッベ数を各々N21,ν21と
したとき1.7<N2130<ν21なる条件を満足す
ることを特徴とする請求項1のズームレンズ。
3. The second lens unit includes, in order from the object side, a meniscus negative twenty-first lens having a concave surface facing the image surface side, and a positive second lens.
It has two lenses and a positive twenty-third lens, and satisfies the condition of 1.7 <N2130 <ν21 when the refractive index and Abbe number of the material of the twenty-first lens are N21 and ν21, respectively. The zoom lens according to claim 1.
【請求項4】 前記第432レンズの材質の屈折率とア
ッベ数を各々N432,ν432としたとき 1.7<N432 30<ν432 なる条件を満足することを特徴とする請求項のズーム
レンズ。
4. The zoom lens according to claim 2 , wherein, when the refractive index and Abbe number of the material of the 432rd lens are N432 and ν432, respectively, the following condition is satisfied: 1.7 <N43230 <ν432.
【請求項5】 前記第1群は最も物体側に像面側に凹面
向けたメニスカス状の負レンズと、レンズ中心からレン
ズ周辺部にいくに従い正の屈折力が強くなる形状の少な
くとも1つの非球面を有していることを特徴とする請求
項1のズームレンズ。
5. The first lens unit includes a negative meniscus lens having a concave surface facing the image plane closest to the object side, and at least one non-lens lens having a positive refractive power increasing from the center of the lens toward the periphery of the lens. The zoom lens according to claim 1, wherein the zoom lens has a spherical surface.
JP25134594A 1994-03-17 1994-09-19 Zoom lens Expired - Fee Related JP3284784B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP25134594A JP3284784B2 (en) 1994-09-19 1994-09-19 Zoom lens
US08/404,330 US5710669A (en) 1994-03-17 1995-03-15 Wide-angle zoom lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP25134594A JP3284784B2 (en) 1994-09-19 1994-09-19 Zoom lens

Publications (2)

Publication Number Publication Date
JPH0886964A JPH0886964A (en) 1996-04-02
JP3284784B2 true JP3284784B2 (en) 2002-05-20

Family

ID=17221448

Family Applications (1)

Application Number Title Priority Date Filing Date
JP25134594A Expired - Fee Related JP3284784B2 (en) 1994-03-17 1994-09-19 Zoom lens

Country Status (1)

Country Link
JP (1) JP3284784B2 (en)

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