JPS6256917A - Small-sized zoom lens - Google Patents

Small-sized zoom lens

Info

Publication number
JPS6256917A
JPS6256917A JP19745985A JP19745985A JPS6256917A JP S6256917 A JPS6256917 A JP S6256917A JP 19745985 A JP19745985 A JP 19745985A JP 19745985 A JP19745985 A JP 19745985A JP S6256917 A JPS6256917 A JP S6256917A
Authority
JP
Japan
Prior art keywords
lens
refractive power
aspherical
group
effective diameter
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.)
Pending
Application number
JP19745985A
Other languages
Japanese (ja)
Inventor
Koji Oizumi
大泉 浩二
Yasuhisa Sato
泰久 佐藤
Yasuyuki Yamada
康幸 山田
Hiroki Nakayama
博喜 中山
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 JP19745985A priority Critical patent/JPS6256917A/en
Publication of JPS6256917A publication Critical patent/JPS6256917A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To obtain a small-sized zoom lens which has high optical performance by providing two lens groups and making one lens surface of the 1st or 2nd lens group and the object-side lens surface of the 6th lens aspherical. CONSTITUTION:The 1st lens group which has positive refracting power and the 2nd group which has negative refracting power are provided successively from the object side and the gap between both lens groups is varied to perform power variation. At least one lens surface of the 1st lens group is made aspherical so that the refracting power is larger at a position of 100% in lens surface effective diameter than at a position of 90%. In another way, at least one lens surface of the 2nd lens group is made aspherical so that the negative refracting power is smaller at a position of 90% in lens surface effective diameter than at a position of 100%. Further, the object-side lens surface of the 6th lens is made aspherical so that the negative refracting power is smaller at the lens peripheral part than at the center part. Thus, the optical performance of the small-sized zoom lens is improved.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は小型のズームレンズに関し、特にレンズシャッ
ターカメラ、ビデオカメラ等において有効なパックフォ
ーカスが短くしかもレンズ全長(第1し/ズ面から結像
面までの距m>の短い小製のズームレンズに関・するも
のである。
Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a compact zoom lens, and in particular to a lens shutter camera, a video camera, etc., the effective pack focus is short and the entire length of the lens (from the first lens surface to This invention relates to a small zoom lens with a short distance m> to the image plane.

(従来の技術) 最近レンズシャッターカメラ、ビデオカメラ等の小型化
に伴いレンズ全長の短い小型のズームレンズが要望され
ている。特にし/ズシャッターカメラ等のレンズ交換を
行なわない小型カメラの分野でもズームレンズの装着が
望まn従来用いていた単焦点レンズと同程度の長さの小
型のズームレンズが要望されている。
(Prior Art) Recently, with the miniaturization of lens shutter cameras, video cameras, etc., there has been a demand for compact zoom lenses with short overall lens lengths. Particularly in the field of small cameras such as zoom shutter cameras that do not require lens replacement, it is desired to attach a zoom lens. There is a demand for a small zoom lens with a length comparable to that of conventional single focus lenses.

通常レンズシャッターカメラで多用されている標準画角
(撮影画角2ω−47度で35■スチールカメラに換算
すると焦点距離50111+1程度)を含むズームレン
ズは例えば特公昭49−29146号公報をはじめ多数
提案されている。この糧のズームレンズは物体側より順
に負の屈折力の第ルンス群と正の屈折力の1@2レンズ
群の2つのレンズ群より構成し両レンズ群の間隔を変え
て変倍するものであるが物体側より順に負と正の屈折力
配置となっている為にパックフォーカスが比較的長くな
り一眼レフレックスカメラとしては好ましい構成である
がレンズシャッターカメラとしてはレンズ全長が長すぎ
る傾向があった。
Many zoom lenses, including the standard angle of view commonly used in lens-shutter cameras (photographing angle of view of 2ω-47 degrees, focal length of about 50111+1 when converted to a still camera), have been proposed in many ways, including Japanese Patent Publication No. 49-29146. has been done. This basic zoom lens consists of two lens groups, the 1st lens group with negative refractive power and the 1@2 lens group with positive refractive power, in order from the object side, and the magnification is varied by changing the distance between both lens groups. However, because the refractive power is arranged in order from the object side to negative and positive, the puck focus is relatively long, which is a desirable configuration for a single-lens reflex camera, but the overall lens length tends to be too long for a lens shutter camera. Ta.

本出願人は先に特開昭57−201213号公報におい
て物体側より順に正の屈折力の第1レンズ群ト負の屈折
力の第2レンズ群の2つのレンズ群で構成し、両レンズ
群の間隔を変えて変倍する小型のズームレンズを提案し
た。
The present applicant previously disclosed in Japanese Unexamined Patent Application Publication No. 57-201213 that the system is composed of two lens groups, a first lens group having a positive refractive power and a second lens group having a negative refractive power, in order from the object side. We proposed a compact zoom lens that changes the magnification by changing the distance between the two.

同公報においては物体側より順に正、負の屈折力配置を
採用している為にパックフォーカスを比較的短く、しか
もレンズ全長の短いズームレンズ1c達成している。
In this publication, since a positive and negative refractive power arrangement is adopted in order from the object side, a zoom lens 1c with a relatively short pack focus and a short overall lens length is achieved.

(発明が解決しようとする問題点)   一本発明は本
出願人が先に特開昭57−201213号公報で提案し
た小型のズームレンズを東に改良し、Fナンバーを明る
くし、しかも変倍比を2倍程度にまで拡大し、画面全体
にわたり良好なる光字性能を有した小型のズームレンズ
の提供を目的とする。
(Problems to be Solved by the Invention) The present invention further improves the compact zoom lens that the present applicant previously proposed in Japanese Patent Application Laid-Open No. 57-201213, has a brighter F-number, and has variable magnification. The purpose of the present invention is to provide a compact zoom lens that has a zoom ratio of about 2 times and has good optical character performance over the entire screen.

(問題点を解決するための手段) 物体側よシj臓に正の屈折力の第1レンズ群と負の屈折
力の第2レンズ群の2つのレンズ群ヲ有し、両レンズ群
の間隔を変えて変倍を行う小型のズームレンズにおいて
、前記第1レンズ群は物体便へ凸面を向けたメニスカス
状の正の屈折力の爾ルンズ、両し/ズ面が凹面の第2レ
ンズ、両レンズ面が凸面の第3レンズそして同じ< 両
レンズ面が凸面の第4レンズの4−)のレンズを治し、
前記第2レンズ群は像面側に凸面を向けたメニスカス状
の正の屈折力の第5レンズ・物体側に凹面を同けた負の
屈折力の第6レンズの2つのレンズを有し、前記第ルン
ス中の少なくとも1つのレンズ向をレンズ面有効径の9
割の位置に比べ10割の位置の方が正の屈折力が強くな
る形状の非球面より構成し若しくは前記第z レンズ中
の少なくとも1つのレンズ面をレンズ面有効径の9割の
位置に比べ10割の位置の方が負の屈折力が弱まろ形状
の非球面より構成し、前記第6レンズの物体側のレンズ
面をレンズ周辺部の負の屈折力が中心部の負の屈折力よ
りも弱くなるような形叡7で構成したことであ、。  
      ′°4叫“ 1この信奉発明の特徴は実施列において記載されている
(Means for solving the problem) There are two lens groups on the object side and the body: a first lens group with positive refractive power and a second lens group with negative refractive power, and the distance between both lens groups is In a compact zoom lens that performs magnification by changing the lens, the first lens group includes a meniscus-shaped lens with positive refractive power with a convex surface facing the object, a second lens with concave surfaces on both sides, and a second lens with concave surfaces on both sides. Cure the third lens whose lens surface is convex and the fourth lens (4-) whose lens surfaces are both convex,
The second lens group has two lenses: a meniscus-shaped fifth lens with a positive refractive power having a convex surface facing the image plane side, and a sixth lens having a negative refractive power with a concave surface facing the object side; The direction of at least one lens during the first run is set to 9 of the effective diameter of the lens surface.
It is composed of an aspherical surface having a shape in which the positive refractive power is stronger at the 100% position than at the 100% position, or at least one lens surface in the z-th lens is compared to the position at 90% of the effective diameter of the lens surface. The negative refractive power is weaker at the 100% position, and the lens surface on the object side of the sixth lens is configured so that the negative refractive power at the periphery of the lens is greater than the negative refractive power at the center. It is composed of form Ei 7 which also makes it weak.
``°4 shout'' 1. The features of this invention are described in the implementation column.

(実施列) 第2図は本発明の数1直実施[HJ 1のレンズ断面図
である。同図において(4)は広角! 、(B)は望遠
熾でのズーム位置を示す。
(Implementation row) FIG. 2 is a cross-sectional view of the lens of the number 1 direct implementation [HJ 1] of the present invention. In the same figure, (4) is a wide angle! , (B) shows the zoom position in telephoto mode.

同図においてlは正の屈折力の第1し/ズ群、■は負の
屈折力の第2レンズ群で69、両レンズ群の間隔を減少
させながら両レンズ群を物体側へ移動さ七て変倍を行っ
ている。このような屈折力配置により本実施列では広角
端でのレンズ全長を最小としたパックフォーカスの短い
ズームレンズを達成している。
In the figure, l is the first lens group with positive refractive power, ■ is the second lens group with negative refractive power, and both lens groups are moved toward the object side while decreasing the distance between them. The magnification is changed. With such a refractive power arrangement, this embodiment achieves a zoom lens with a short pack focus and a minimum overall lens length at the wide-angle end.

又本実施列では第1レンズ群と第2レンズ群の各レンズ
構成及び@lレンズ若しくは第2レンズの少なくとも1
つのレンズ面と第6レンズの物体側のレンズ面に前述の
形状を有する非球面を施すことにより、変1きによる収
差変動を少なくし画面全体の諸収差を良好に補正してh
る。
In addition, in this implementation row, each lens configuration of the first lens group and the second lens group, and at least one of the @l lens or the second lens
By applying aspherical surfaces having the above-mentioned shape to the two lens surfaces and the object-side lens surface of the sixth lens, aberration fluctuations due to aberrations are reduced and various aberrations of the entire screen are well corrected.
Ru.

特に望遠側における画面中心部から中゛間部にかけての
ハローを良好に補正している。
In particular, the halo from the center to the middle of the screen on the telephoto side is well corrected.

第1図は第1レンズ群の1つのレンズ面に非球面を施し
たときの効果の説明図である。
FIG. 1 is an explanatory diagram of the effect when one lens surface of the first lens group is made an aspherical surface.

同図においてGl 、 G2 、 G3は各々肩11第
2、第3レンズである。金板りに第1、第2レンズの各
レンズ向R1、R2、R3、R4が全て球面で”あり入
射高hAで入射し九軸上光線人の球面収dが良好に補正
されているものとする。このとき−上元JAよりも縞い
入射高hBで入射する1i4iIと九aBは同図の破線
で示すように第11第2レンズを通過する。
In the figure, Gl, G2, and G3 are the second and third lenses of the shoulder 11, respectively. The lens directions R1, R2, R3, and R4 of the first and second lenses are all spherical surfaces on the gold plate, and the light is incident at an incident height hA, and the spherical convergence d of the nine-axis rays is well corrected. In this case, 1i4iI and 9aB, which are incident at a more striped incidence height hB than the upper source JA, pass through the eleventh second lens as shown by the broken line in the figure.

そして返りに第3レンズG3以降で球面収差が十分に補
正されていないとすると、多くの場付非点収差尋の他の
諸収差との影響により光線Bは補正過剰の球面収差を有
しつつ結儂する。
On the other hand, if the spherical aberration is not sufficiently corrected after the third lens G3, the ray B will have overcorrected spherical aberration due to the influence of many local astigmatisms and other aberrations. to conclude.

この為本実施列では囲えば第1レンズに非球面?施すと
きには非球面形状がレンズ有効面の周辺部がレンズ有効
面の9割の位置に比べて正の屈折力が強くなる形状とな
るように、又第2レンズに非球面を施すときには非球面
形状がレンズ有効面の周辺部がレンズ有効面の9割の位
置に比べて負の屈折力が弱くなろように構成している。
For this reason, in this practical array, if we surround it, is the first lens an aspherical surface? When applying an aspherical surface to the second lens, the aspherical shape should be such that the periphery of the lens effective surface has a stronger positive refractive power than 90% of the lens effective surface, and when applying an aspherical surface to the second lens, However, the lens is configured such that the negative refractive power at the periphery of the lens effective surface is weaker than at 90% of the lens effective surface.

これによシ同図の破線の光路が’4繍の光路となるよう
に補正し、球面収差の補正、特に望遠側での球面収差と
・・ローを良好に補正し、ズームレンズの大ロ径比化t
−図っテLAル。
As a result, the optical path indicated by the broken line in the same figure is corrected to become a four-point optical path, and spherical aberration, especially spherical aberration at the telephoto end and low, are corrected well. Diameter ratio t
-It's true.

一般に球UM収差を補正する場合には軸上光束のレンズ
面への入射高が高くなるレンズ面に非球面を導入するの
が効果的である。
Generally, when correcting spherical UM aberration, it is effective to introduce an aspheric surface into the lens surface where the height of incidence of the axial light beam on the lens surface is high.

従ってifレンズ群の4つのレンズであればどのレンズ
面に非球面t−施しても良いが、本実施f!A1では特
に第1若しくけ第2レンズのレンズ面に非球面を施して
いる。これによりて翔外光束の非球面への入射高がなる
べく高くなるようにして軸外の・・ロー収差も同時に良
好に補正している。
Therefore, as long as there are four lenses in the IF lens group, an aspherical surface may be applied to any lens surface, but in this embodiment f! In A1, in particular, the lens surface of the first or second lens is made aspherical. As a result, the height of incidence of the extraneous light beam on the aspherical surface is made as high as possible, and off-axis low aberrations are also well corrected at the same time.

又第6レンズの物体側のレンズ面の負の屈折力が中心部
に比べ周辺部において弱くなるような形状の非球面とす
ることにより変倍中間部での像面特性が負の方向へ増大
するのを防止すると共に広角側での歪曲収差が正の方向
へ増大するのを防止している。
In addition, by making the object-side lens surface of the sixth lens an aspherical surface shaped so that the negative refractive power is weaker at the periphery than at the center, the image surface characteristics at the intermediate portion of magnification increase in the negative direction. This also prevents distortion on the wide-angle side from increasing in the positive direction.

尚本発明においてフォーカシングはレンズ系全体を繰り
出して行うのが収差変動が少なくて好まし、いが第1レ
ンズ群若しくは第2レンス群のみを移動させて行っても
良い。これによればレンズ鏡筒が簡単となる。
In the present invention, it is preferable to perform focusing by extending the entire lens system to reduce aberration fluctuations, but it is also possible to perform focusing by moving only the first lens group or the second lens group. According to this, the lens barrel becomes simple.

次に本発明の数値実施列を示す。数値実施列においてR
iは物体側より順に@1番目のレンズ面の曲率半径、D
Iは物体側より第1番目のレンズ厚及び空気間隔、N1
 とν量は各々物体側より順に第1番目のレンズのガラ
スの屈折率とアツベ数である。
Next, numerical implementation sequences of the present invention are shown. R in the numerical implementation sequence
i is the radius of curvature of the first lens surface from the object side, D
I is the first lens thickness and air distance from the object side, N1
and ν are the refractive index and Abbe number of the glass of the first lens, respectively, in order from the object side.

非球面形状は光軸方向にX軸、光軸と垂直な方向KY軸
、光の進行方向を正とし、レンズの頂点とX軸の交点を
原点に採り、Rをレンズ面の近軸曲率半径、a工+ 6
2 + 13 、*a * 15 。
The aspherical shape has the X axis in the optical axis direction, the KY axis in the direction perpendicular to the optical axis, the direction of light propagation as positive, the intersection of the vertex of the lens and the X axis as the origin, and R as the paraxial radius of curvature of the lens surface. , a-tech + 6
2 + 13, *a * 15.

b工、 b2. b3. b4を非球面係数とするとき
+ a4Y8+ a5Y” + bIY3+ b2Y5
+ b3Y’十b4Y9 なる式で表わされるものである。
b engineering, b2. b3. When b4 is an aspherical coefficient, + a4Y8+ a5Y” + bIY3+ b2Y5
+b3Y'+b4Y9.

又[0−03JC)表示は 110−3Jt’意味−i
る。
Also, [0-03JC) display is 110-3Jt' meaning-i
Ru.

数値実施列I F−3&06〜71.19  FNO−1:19〜5.
12ω−59,2”−33,ざ番R1−17,93D 
 l−3,09N  l場1.53113      
ν 1−6L  4rL 2− 81.22  02−
1.84R3−−19,65D  3−1.93   
 N 2−1.7B590     ν 2−4表2R
4−25,9204噂0.39 R5−35,4405−4,65N5−L51633 
  シ3−641R6−−17.62   D 6−0
.22R7−59,56D 7−L 1(i   N 
4−1.51633    シ4−6411ζ8−−2
5.66   08−可変R9= −25,9309−
3,417N 5−1.69680    v 5−b
5−5RIO−−16,32DIO−4,53・R11
−−14,55Dll−1,62N  6−1.61J
311     ν 6−60.7Rt2−−2tti
、 16 It l而;非球面係数 a −−Z646D−06R3−−7,3U9D−08
R4−7,177D−10a5=−1,1720−12
R11面;非球面 a =−9,1600−03az−′L115D−05
a a=  47380−07     & 4−− 
Z571D −09=s=−6,2810−12 I)虐−&609D−O5b2−一翫1920−06b
3−−1.395L)−L18   b4−Z929D
−10R1面;有効径10割部の曲率半匝 18.47
有効径9割部の曲率半径 L&53 数ILII!実施列2 F−3&02〜71.11  FNO−1:3.8−5
 2ω−59,3°〜318゜ltl”17.87  
 Dl=Z14   Nl”1.53113   yl
−62h4R2−76、1802−139 R3−−19,62D 3402  N 2−1.78
590   シ2−44.2R← 2FL87   D
←α43 R5−34,25L)5−470   N3−1.51
6J3   シ3−64. IR6−−17.47  
0−へ22 R7−61,36L12−121    N 4−1.
51633    ν 4−64.1R8−−25,8
608−可変 kL 9− −25.71     L)’)& d5
     N  5−1.(i41680    v 
 5”55.5RIO−−1ti、41    DIG
−表54all−−14(io    D11=1.6
2   N 6−1.60311    v 6−6a
 ?lζ12−225.14 Rj而;非球面係数 a2−6.645D−06a3−Z5(30−08−t
、4”−7,4950−10a5” 1933D−12
R+1而;非球面係数 al−−9,003D−03a2−10290−05&
3電 4.742D−0714層−2,392D−09
a5−−6.1880−12 bl−−6,211D−05bl−−5,4130−0
6b3−−L198D−08b、−λ893D−10R
2而;有効径IO割部面曲率半径 6295有効径9割
部の曲率半径 6a、77 数値夷M列3 F−3427〜64L54  FNO−1:ふ8〜52
ω−645〜35″R1−16゜64   D 142
6   N l−1,60311ν l−6(17R>
 77.19    D 2−1.63R3−−20,
03D 3−172   N 2−1.80610  
  シ2−40.9R4總 3λ22   D 4−α
44R5= 66、97   05−IL 84   
N 3−1.60311    シ3=−60.7R6
−−17.58    D 6−0.15R7−122
,62D 7−1.87   N 4−1.60311
    シ4−60.7R8−−35,2608−可変 R9−−21,43D 9−3.04   N 5”1
.71700   ν5=47.9RIO−−15,3
0DIO−4,11R11−−14,81Dll−1,
fiON G−1,60311ジロー60.7R12−
−91,51 R3而;非球面係数 m s −1,1799D−12 R11而;非球面係数 a −−9,8430−03a −−7,2350−0
6a −1,1350−07a −:1.5211)−
093〆轟 m s −16650−12 b l ・−’2..697 D−05b 2、−Z 
6 (I G I) −06b3−−2.8650−0
8   b4−−1.086D−1083面;有効径1
0割部の曲率半径 −20,16有効径9割部の曲率半
径 −20,09(本発明の効果) 以上のように本発明によればFナンバー5程度、変倍比
2程度の画面全体にわたシ良好なる収差補正を達成した
、望遠比(レンズ全長/広角端での無点距離)12程度
のレンズ全長の短い小型のズームレンズを達成すること
かで−きる。
Numerical implementation sequence I F-3&06~71.19 FNO-1:19~5.
12ω-59, 2”-33, number R1-17, 93D
l-3,09N l field 1.53113
ν 1-6L 4rL 2- 81.22 02-
1.84R3--19,65D 3-1.93
N 2-1.7B590 ν 2-4 Table 2R
4-25,9204 Rumor 0.39 R5-35,4405-4,65N5-L51633
C3-641R6--17.62 D 6-0
.. 22R7-59, 56D 7-L 1(i N
4-1.51633 4-6411ζ8--2
5.66 08-variable R9= -25,9309-
3,417N 5-1.69680 v 5-b
5-5RIO--16,32DIO-4,53・R11
--14,55Dll-1,62N 6-1.61J
311 ν 6-60.7Rt2--2tti
, 16 It l; Aspheric coefficient a --Z646D-06R3--7,3U9D-08
R4-7,177D-10a5=-1,1720-12
R11 surface; aspherical surface a = -9,1600-03az-'L115D-05
a a= 47380-07 & 4--
Z571D -09=s=-6,2810-12 I) Torture-&609D-O5b2-Ippan 1920-06b
3--1.395L)-L18 b4-Z929D
-10R1 surface; curvature of 100% effective diameter half trowel 18.47
Radius of curvature of 90% effective diameter L & 53 Number ILII! Implementation row 2 F-3&02~71.11 FNO-1:3.8-5
2ω-59,3°~318°ltl”17.87
Dl=Z14 Nl”1.53113 yl
-62h4R2-76, 1802-139 R3--19,62D 3402 N 2-1.78
590 Shi2-44.2R← 2FL87 D
←α43 R5-34, 25L) 5-470 N3-1.51
6J3 C3-64. IR6--17.47
0-to 22 R7-61, 36L12-121 N 4-1.
51633 ν 4-64.1R8--25,8
608-Variable kL 9--25.71 L)') & d5
N5-1. (i41680v
5”55.5RIO--1ti, 41 DIG
-Table 54all--14 (io D11=1.6
2 N 6-1.60311 v 6-6a
? lζ12-225.14 Rj; Aspheric coefficient a2-6.645D-06a3-Z5 (30-08-t
, 4”-7,4950-10a5” 1933D-12
R+1; Aspherical coefficient al--9,003D-03a2-10290-05&
3D 4.742D-0714 layer-2,392D-09
a5--6.1880-12 bl--6,211D-05bl--5,4130-0
6b3--L198D-08b, -λ893D-10R
2; Effective diameter IO portion surface curvature radius 6295 Effective diameter 90% radius of curvature 6a, 77 Numeric value M column 3 F-3427 ~ 64L54 FNO-1: Fu8 ~ 52
ω-645~35″R1-16°64 D 142
6 N l-1,60311ν l-6 (17R>
77.19 D 2-1.63R3--20,
03D 3-172 N 2-1.80610
C2-40.9R4 3λ22 D 4-α
44R5= 66, 97 05-IL 84
N 3-1.60311 C3=-60.7R6
--17.58 D 6-0.15R7-122
,62D 7-1.87 N 4-1.60311
Shi4-60.7R8--35,2608-variable R9--21,43D 9-3.04 N 5"1
.. 71700 ν5=47.9RIO--15,3
0DIO-4, 11R11--14, 81Dll-1,
fiON G-1, 60311 Jiro 60.7R12-
-91,51 R3; Aspherical coefficient m s -1,1799D-12 R11; Aspherical coefficient a --9,8430-03a --7,2350-0
6a-1,1350-07a-:1.5211)-
093〆Todoro m s -16650-12 b l ・-'2. .. 697 D-05b 2, -Z
6 (IGI) -06b3--2.8650-0
8 b4--1.086D-1083 plane; effective diameter 1
Radius of curvature at 0% part -20,16 Radius of curvature at 90% effective diameter -20,09 (Effects of the present invention) As described above, according to the present invention, the entire screen has an F number of about 5 and a variable magnification ratio of about 2. It is possible to achieve a compact zoom lens with a short overall lens length of about 12 (lens overall length/no-point distance at the wide-angle end) and which achieves excellent aberration correction over time.

表図面のl″貞単説明 − 第1図は本発明に係る非球面の効果の説明図、第2図は
本発明の数値実施列1のレンズ断面図、第3図から第5
図は各々本発明のa直実施列1〜3の諸収差図、図中1
.ffは各々第1、第2レンズ群、囚、 (B) 、 
<(5は各々広角端、中間、望遠趨のズーム位置での諸
収差図、S、Cは正弦条件、gはg線、dはdaI、△
Sはサジタル像面、6Mはメリデイオナル像面を示す。
Simple explanation of the table drawings - Fig. 1 is an explanatory diagram of the effect of the aspherical surface according to the present invention, Fig. 2 is a cross-sectional view of the lens of the numerical implementation row 1 of the present invention, Figs.
The figures are various aberration diagrams of the a series 1 to 3 of the present invention, 1 in the figure.
.. ff are the first and second lens groups, respectively, (B),
<(5 is various aberration diagrams at wide-angle end, intermediate, and telephoto zoom positions, S and C are sine conditions, g is g-line, d is daI, △
S indicates a sagittal image plane, and 6M indicates a meridional image plane.

Claims (1)

【特許請求の範囲】[Claims] 物体側より順に正の屈折力の第1レンズ群と負の屈折力
の第2レンズ群の2つのレンズ群を有し、両レンズ群の
間隔を変えて変倍を行う小型のズームレンズにおいて、
前記第1レンズ群は物体側へ凸面を向けたメニスカス状
の正の屈折力の第1レンズ、両レンズ面が凹面の第2レ
ンズ、両レンズ面が凸面の第3レンズそして同じく両レ
ンズ面が凸面の第4レンズの4つのレンズを有し、前記
第2レンズ群は像面側に凸面を向けたメニスカス状の正
の屈折力の第5レンズ、物体側に凹面を向けた負の屈折
力の第6レンズの2つのレンズを有し、前記第1レンズ
中の少なくとも1つのレンズ面をレンズ面有効径の9割
の位置に比べ10割の位置の方が正の屈折力が強くなる
形状の非球面より構成し若しくは前記第2レンズ中の少
なくとも1つのレンズ面をレンズ面有効径の9割の位置
に比べ10割の位置の方が負の屈折力が弱まる形状の非
球面より構成し、前記第6レンズの物体側のレンズ面を
レンズ周辺部の負の屈折力が中心部の負の屈折力よりも
弱くなるような形状の非球面で構成したことを特徴とす
る小型のズームレンズ。
A small zoom lens that has two lens groups, a first lens group with positive refractive power and a second lens group with negative refractive power, in order from the object side, and performs magnification by changing the distance between both lens groups.
The first lens group includes a meniscus-shaped first lens with a positive refractive power with a convex surface facing the object side, a second lens with both concave lens surfaces, a third lens with both lens surfaces convex, and a third lens with both lens surfaces convex. The second lens group includes a meniscus-shaped fifth lens with a positive refractive power with a convex surface facing the image side, and a negative refractive power with a concave surface facing the object side. a sixth lens, and the positive refractive power of at least one lens surface in the first lens is stronger at a position of 100% of the effective diameter of the lens surface than at a position of 90% of the effective diameter of the lens surface. or at least one lens surface in the second lens is composed of an aspherical surface having a shape in which the negative refractive power is weaker at a position of 100% of the effective diameter of the lens surface than at a position of 90%. , a compact zoom lens characterized in that the object-side lens surface of the sixth lens is formed of an aspherical surface having a shape such that the negative refractive power at the peripheral part of the lens is weaker than the negative refractive power at the center part. .
JP19745985A 1985-09-05 1985-09-05 Small-sized zoom lens Pending JPS6256917A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19745985A JPS6256917A (en) 1985-09-05 1985-09-05 Small-sized zoom lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19745985A JPS6256917A (en) 1985-09-05 1985-09-05 Small-sized zoom lens

Publications (1)

Publication Number Publication Date
JPS6256917A true JPS6256917A (en) 1987-03-12

Family

ID=16374853

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19745985A Pending JPS6256917A (en) 1985-09-05 1985-09-05 Small-sized zoom lens

Country Status (1)

Country Link
JP (1) JPS6256917A (en)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63311224A (en) * 1987-06-12 1988-12-20 Olympus Optical Co Ltd Compact zoom lens
JPH0273322A (en) * 1988-09-09 1990-03-13 Nikon Corp Miniature zoom lens
JPH02120714A (en) * 1988-10-31 1990-05-08 Canon Inc Zoom lens of small size
US5218478A (en) * 1989-11-17 1993-06-08 Canon Kabushiki Kaisha Small-sized zoom lens
US5327290A (en) * 1989-10-13 1994-07-05 Minolta Camera Kabushiki Kaisha Compact size zoom lens system
JPH07306361A (en) * 1994-05-11 1995-11-21 Canon Inc Compact zoom lens
US5541773A (en) * 1993-03-26 1996-07-30 Olympus Optical Co., Ltd. Two-unit zoom lens system
US5585971A (en) * 1993-03-30 1996-12-17 Canon Kabushiki Kaisha Small-sized variable magnification lens
US5687027A (en) * 1995-03-02 1997-11-11 Canon Kabushiki Kaisha Zoom lens for optical apparatus such as camera
USRE35775E (en) * 1987-07-23 1998-04-21 Betensky; Ellis I. Zoom lens with short back focal length
US5757556A (en) * 1995-05-10 1998-05-26 Canon Kabushiki Kaisha Zoom lens
US5798873A (en) * 1993-11-25 1998-08-25 Canon Kabushiki Kaisha Small-sized zoom lens
US5831772A (en) * 1993-04-07 1998-11-03 Canon Kabushiki Kaisha Compact zoom lens
US5844725A (en) * 1994-09-06 1998-12-01 Canon Kabushiki Kaisha Zoom lens
US6008953A (en) * 1996-07-26 1999-12-28 Canon Kabushiki Kaisha Zoom lens
US6215600B1 (en) 1997-09-30 2001-04-10 Canon Kabushiki Kaisha Zoom lens
US6219190B1 (en) 1998-11-06 2001-04-17 Canon Kabushiki Kaisha Zoom lens
US6384986B1 (en) 1999-02-02 2002-05-07 Canon Kabushiki Kaisha Zoom lens and optical apparatus having the same
US10983315B2 (en) 2018-02-28 2021-04-20 Canon Kabushiki Kaisha Optical system and imaging apparatus

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63311224A (en) * 1987-06-12 1988-12-20 Olympus Optical Co Ltd Compact zoom lens
USRE35775E (en) * 1987-07-23 1998-04-21 Betensky; Ellis I. Zoom lens with short back focal length
JPH0273322A (en) * 1988-09-09 1990-03-13 Nikon Corp Miniature zoom lens
US4929069A (en) * 1988-09-09 1990-05-29 Nikon Corporation Zoom lens
JPH02120714A (en) * 1988-10-31 1990-05-08 Canon Inc Zoom lens of small size
US5327290A (en) * 1989-10-13 1994-07-05 Minolta Camera Kabushiki Kaisha Compact size zoom lens system
US5218478A (en) * 1989-11-17 1993-06-08 Canon Kabushiki Kaisha Small-sized zoom lens
US5541773A (en) * 1993-03-26 1996-07-30 Olympus Optical Co., Ltd. Two-unit zoom lens system
US5585971A (en) * 1993-03-30 1996-12-17 Canon Kabushiki Kaisha Small-sized variable magnification lens
US5831772A (en) * 1993-04-07 1998-11-03 Canon Kabushiki Kaisha Compact zoom lens
US5798873A (en) * 1993-11-25 1998-08-25 Canon Kabushiki Kaisha Small-sized zoom lens
JPH07306361A (en) * 1994-05-11 1995-11-21 Canon Inc Compact zoom lens
US5844725A (en) * 1994-09-06 1998-12-01 Canon Kabushiki Kaisha Zoom lens
US5687027A (en) * 1995-03-02 1997-11-11 Canon Kabushiki Kaisha Zoom lens for optical apparatus such as camera
US5757556A (en) * 1995-05-10 1998-05-26 Canon Kabushiki Kaisha Zoom lens
US6008953A (en) * 1996-07-26 1999-12-28 Canon Kabushiki Kaisha Zoom lens
US6215600B1 (en) 1997-09-30 2001-04-10 Canon Kabushiki Kaisha Zoom lens
US6219190B1 (en) 1998-11-06 2001-04-17 Canon Kabushiki Kaisha Zoom lens
US6384986B1 (en) 1999-02-02 2002-05-07 Canon Kabushiki Kaisha Zoom lens and optical apparatus having the same
US10983315B2 (en) 2018-02-28 2021-04-20 Canon Kabushiki Kaisha Optical system and imaging apparatus

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