JPH07306361A - Compact zoom lens - Google Patents

Compact zoom lens

Info

Publication number
JPH07306361A
JPH07306361A JP6121982A JP12198294A JPH07306361A JP H07306361 A JPH07306361 A JP H07306361A JP 6121982 A JP6121982 A JP 6121982A JP 12198294 A JP12198294 A JP 12198294A JP H07306361 A JPH07306361 A JP H07306361A
Authority
JP
Japan
Prior art keywords
lens
positive
telephoto
angle
numerical
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
JP6121982A
Other languages
Japanese (ja)
Inventor
Yoshiaki Ito
良紀 伊藤
Original Assignee
Canon Inc
キヤノン株式会社
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, キヤノン株式会社 filed Critical Canon Inc
Priority to JP6121982A priority Critical patent/JPH07306361A/en
Publication of JPH07306361A publication Critical patent/JPH07306361A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To provide a compact zoom lens consisting of two lens groups as a whole ad having a short total length and high optical performance. CONSTITUTION:In this compact zoom lens consisting of two lens groups of a first group L1 having positive refractive power and a second group L2 having negative refractive power in order from the object side and varying the power by changing interval between both lens groups, the first group L1 has at least two positive lenses and the second group L2 has a positive lens and only the negative lens on the image plane side of the positive lens. The image forming magnification beta2T of the second group L2 at the telescopic end, the focal distance of the whole system fT at the telescopic end and the diagonal length Y of the effective screen are appropriately set.

Description

【発明の詳細な説明】Detailed Description of the Invention
【0001】[0001]
【産業上の利用分野】本発明はレンズシャッターカメ
ラ、ビデオカメラ等に好適な2つのレンズ群より成る小
型のズームレンズに関し、特に各レンズ群のレンズ構成
を適切に設定することにより、収差補正を良好に行うと
共にレンズ全長(第1レンズ面から像面までの距離)の
短縮化を図った広角端の撮影画角60度、変倍比3程度
の小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 compact zoom lens composed of two lens groups suitable for a lens shutter camera, a video camera, etc., and in particular, by properly setting the lens configuration of each lens group, aberration correction is possible. The present invention relates to a small-sized zoom lens having a photographing angle of view of 60 degrees at a wide-angle end and a zoom ratio of about 3, which is favorably performed and shortens the entire lens length (distance from the first lens surface to the image plane).
【0002】[0002]
【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。特にレン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れ、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。
本出願人は先に特開昭56−128911号公報、特開
昭57−201213号公報、特開昭60−17081
6号公報、特開昭60−191216号公報、特開昭6
2−56917号公報等において、物体側より順に正の
屈折力の第1群と負の屈折力の第2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所
謂2群ズームレンズを提案した。
2. Description of the Related Art Recently, with the downsizing of lens shutter cameras, video cameras, etc., there has been a demand for a compact zoom lens having a short overall lens length. In particular, even in the field of a small camera such as a lens shutter camera in which lenses are not exchanged, it is desired to mount a zoom lens, and a small zoom lens having a length about the same as that of a conventionally used single focus lens is desired.
The applicant of the present invention has previously disclosed JP-A-56-128911, JP-A-57-201213, and JP-A-60-17081.
6, JP 60-191216 A, JP 6
Japanese Patent Application Laid-Open No. 2-56917 and the like, which 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, and a variable magnification varying the distance between both lens groups. The so-called two-group zoom lens has been proposed.
【0003】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、バックフォーカスを比較的短く
し、しかもレンズ全長の短縮化を図った高い光学性能を
有した2群ズームレンズを達成している。
In this publication, a positive / negative refractive power arrangement is adopted in order from the object side to provide a two-group zoom lens having high optical performance with a relatively short back focus and a shortened overall lens length. Has achieved.
【0004】この他、特開平2−50118号公報、特
開平2−71220号公報、特開平2−19082号公
報、そして特開平4−145408号公報等では正の屈
折力の第1群と負の屈折力の第2群より成り、両レンズ
群の間隔を変化させながら双方のレンズ群を前方に移動
させて変倍を行った比較的高変倍比の2群ズームレンズ
を開示している。
In addition, in Japanese Patent Laid-Open No. 2-50118, Japanese Patent Laid-Open No. 2-71220, Japanese Patent Laid-Open No. 2-19082, and Japanese Patent Laid-Open No. 4-145408, a first group having a positive refractive power and a negative refractive power are used. Discloses a second group zoom lens having a relatively high zoom ratio, which is composed of a second lens group having a refractive power of 2 and has a relatively high variable power ratio by moving both lens groups forward while varying the distance between the lens groups. .
【0005】[0005]
【発明が解決しようとする課題】前述した正の屈折力の
第1群と負の屈折力の第2群の2つのレンズ群より成る
2群ズームレンズにおいて、レンズ系全体の小型化を図
りつつ、広画角で3倍程度の変倍比を有しつつ、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
のレンズ構成を適切に設定する必要がある。
In the above-described two-group zoom lens composed of two lens groups, the first lens group having a positive refractive power and the second lens group having a negative refractive power, the overall lens system is downsized. In order to obtain good optical performance over the entire zoom range while having a zoom ratio of about 3 in a wide angle of view, it is necessary to set the lens configuration of each lens group appropriately.
【0006】一般に第1,第2群の双方の屈折力を強め
れば変倍における各レンズ群の移動量が少なくなり、レ
ンズ全長の短縮化が可能となる。
Generally, if the refractive powers of both the first and second groups are strengthened, the amount of movement of each lens group during zooming is reduced, and the total lens length can be shortened.
【0007】しかしながら各レンズ群の屈折力を単に強
めると変倍に伴う収差変動が大きくなり、これを良好に
補正するのが難しくなってくるという問題点が生じてく
る。
However, if the refracting power of each lens unit is simply increased, the aberration variation due to zooming becomes large, and it becomes difficult to satisfactorily correct this.
【0008】本発明は所謂2群のズームレンズにおい
て、各レンズ群のレンズ構成を適切に設定することによ
り、特に変倍比3程度で広角端の撮影画角が60度程度
の広画角を有しつつ、レンズ全長の短縮化及び後玉レン
ズ径の縮小化を図った全変倍範囲にわたり高い光学性能
を有した小型のズームレンズの提供を目的とする。
According to the present invention, in a so-called two-group zoom lens, by appropriately setting the lens configuration of each lens group, a wide field angle of about 60 degrees is obtained at a wide-angle end with a zoom ratio of about 3. It is an object of the present invention to provide a small-sized zoom lens having high optical performance over the entire zooming range, which has a short overall lens length and a rear lens diameter.
【0009】[0009]
【課題を解決するための手段】本発明の小型のズームレ
ンズは、(1−1)物体側より順に正の屈折力の第1群
と負の屈折力の第2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、該第1群は少なくとも2つの正レンズを有し、該
第2群は正レンズと該正レンズの像面側に1つのみの負
レンズを有し、望遠端における該第2群の結像倍率をβ
2T、望遠端における全系の焦点距離をfT、有効画面
の対角線長をYとしたとき、 3.6<β2T <5.0 ・・・・・・(1) 2.2<fT/Y<3.0 ・・・・・・(2) なる条件を満足することである。
A compact zoom lens according to the present invention comprises (1-1) two lens groups, a first group having a positive refracting power and a second group having a negative refracting power, in order from the object side. In a compact zoom lens which has a variable magnification by changing the distance between both lens groups, the first group has at least two positive lenses, and the second group includes a positive lens and an image surface side of the positive lens. Has only one negative lens and the imaging magnification of the second group at the telephoto end is β
2T, fT is the focal length of the entire system at the telephoto end, and Y is the diagonal length of the effective screen. 3.6 <β2T <5.0 (1) 2.2 <fT / Y < 3.0 ··· (2) to satisfy the condition.
【0010】[0010]
【実施例】図1〜図4は本発明の数値実施例1〜4のレ
ンズ断面図である。図1〜図4のレンズ断面図において
(A)は広角端、(B)は中間、(C)は望遠端のズー
ム位置を示している。
1 to 4 are lens sectional views of numerical examples 1 to 4 of the present invention. In the lens sectional views of FIGS. 1 to 4, (A) shows the zoom position at the wide-angle end, (B) shows the middle position, and (C) shows the zoom position at the telephoto end.
【0011】図中、L1は正の屈折力の第1群、L2は
負の屈折力の第2群であり、両レンズ群の間隔を減少さ
せつつ、両レンズ郡を矢印の如く物体側へ移動させて広
角端から望遠端への変倍を行っている。SPは絞りであ
り、本発明では第1群の像面側に配置しており、変倍に
伴い第1群と一体的に移動している。IPは像面であ
る。
In the figure, L1 is a first lens group having a positive refractive power, and L2 is a second lens group having a negative refractive power. Both lens groups are moved toward the object side as indicated by arrows while reducing the distance between both lens groups. It is moved to zoom from the wide-angle end to the telephoto end. SP is a stop, which is arranged on the image plane side of the first lens unit in the present invention, and moves integrally with the first lens unit upon zooming. IP is the image plane.
【0012】本実施例ではこのようなズーム方式及び前
述でした如くのレンズ構成を採ることにより、広角端で
の広画角化及びレンズ全長の短縮化を図りつつ変倍比3
程度と変倍に伴う収差変動を良好に補正し、全変倍範囲
にわたり高い光学性能を得ている。
In this embodiment, by adopting such a zoom system and the lens structure as described above, a zoom ratio of 3 is achieved while widening the angle of view at the wide-angle end and shortening the total lens length.
The aberration fluctuations associated with the degree and zooming are corrected well, and high optical performance is obtained over the entire zoom range.
【0013】次に本発明のズームレンズのレンズ構成の
特徴について説明する。
Next, the features of the lens configuration of the zoom lens of the present invention will be described.
【0014】正の屈折力の第1群を物体側に凸面を向け
た正レンズ、物体側に凹面を向けた負レンズそして2つ
の正レンズの全体として4つのレンズより構成すること
で主に球面収差とコマ収差を良好に補正している。
The first lens unit having a positive refracting power is composed mainly of a positive lens having a convex surface facing the object side, a negative lens having a concave surface facing the object side, and two positive lenses as a whole with four lenses. Corrects aberrations and coma.
【0015】負の屈折力の第2群を図2の数値実施例2
では、負レンズ、正レンズ、そして像面側に凸面を向け
たメニスカス状の負レンズとの3群3枚のレンズ構成と
している。
A second group of negative refracting power is represented by numerical example 2 in FIG.
In, a negative lens, a positive lens, and a meniscus-shaped negative lens having a convex surface facing the image surface side are included in three groups and three lenses.
【0016】又、図1,図3,図4の数値実施例1,
3,4では、像面側に凸面を向けたメニスカス状の正レ
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群2枚のレンズ構成としている。数値実施例1におい
て、第2群の物体側の正レンズの物体側のレンズ面には
所定の厚さの非球面を設けている。
In addition, numerical examples 1 of FIGS.
In Nos. 3 and 4, a meniscus-shaped positive lens having a convex surface facing the image surface side and a meniscus-shaped negative lens having a convex surface facing the image surface side are used in two groups and two lenses. In Numerical Example 1, an aspherical surface having a predetermined thickness is provided on the object-side lens surface of the object-side positive lens of the second group.
【0017】一般に正と負の屈折力より成る2群ズーム
では第2群は像面に近いところに位置するようになり、
レンズ外径が大きくなる。この第2群を多くのレンズ枚
数で構成するといきおいレンズ系全体が大型化してく
る。
Generally, in the two-group zoom system having positive and negative refracting powers, the second group comes to be located near the image plane,
The lens outer diameter increases. If this second lens group is constructed with a large number of lenses, the overall lens system becomes large.
【0018】そこで本発明では、第2群を所定形状の2
つ又は3つのレンズより構成してレンズ外径の小型化を
図っている。特に本発明では望遠端での第2群の結像倍
率を条件式(1)の如く、又望遠端での全系の焦点距離
と有効画面との比を条件式(2)の如く設定し、これに
より広画角化を図りつつバックフォーカスを短くしてレ
ンズ系全体の小型化を図っている。
Therefore, in the present invention, the second group is made to have a predetermined shape.
It is configured with three or three lenses to reduce the outer diameter of the lens. Particularly, in the present invention, the imaging magnification of the second lens unit at the telephoto end is set as in conditional expression (1), and the ratio of the focal length of the entire system at the telephoto end to the effective screen is set as in conditional expression (2). By doing so, the back focus is shortened while widening the angle of view, and the overall size of the lens system is reduced.
【0019】次に条件式(1),(2)の技術的意味に
ついて説明する。条件式(1)は望遠端における2群の
結像倍率に関するものであり、条件式(1)の上限値を
越えて第2群の結像倍率が大きくなり過ぎると望遠端の
レンズ全長が長くなる傾向があり、沈胴構造が複雑にな
るので良くない。又、条件式(1)の下限値を越えて第
2群の結像倍率が小さくなると、広角端でのバックフォ
ーカスが短くなる傾向があり、後玉レンズ径が大きくな
るので良くない。
Next, the technical meaning of the conditional expressions (1) and (2) will be described. Conditional expression (1) relates to the image forming magnification of the second group at the telephoto end, and if the image forming magnification of the second group becomes too large beyond the upper limit of conditional expression (1), the total lens length at the telephoto end becomes long. It is not good because it tends to become complicated and the collapsible structure becomes complicated. If the lower limit of conditional expression (1) is exceeded and the image forming magnification of the second lens unit becomes small, the back focus at the wide-angle end tends to become short, and the rear lens diameter becomes large, which is not preferable.
【0020】条件式(2)は望遠端における全系の焦点
距離と有効画角の対角線長に関するものである。条件式
(2)の上限値を越えて望遠端の焦点距離が長くなり過
ぎると望遠端のレンズ全長が長くなる傾向があり、沈胴
構造が複雑になるので良くない。又、条件式(2)の下
限値を越えて望遠端の焦点距離が短くなると所定の変倍
比を得るのが困難になってくるので良くない。
Conditional expression (2) relates to the focal length of the entire system at the telephoto end and the diagonal length of the effective angle of view. When the upper limit of conditional expression (2) is exceeded and the focal length at the telephoto end becomes too long, the total lens length at the telephoto end tends to become long, and the collapsible structure becomes complicated, which is not preferable. Further, if the focal length at the telephoto end becomes shorter than the lower limit of conditional expression (2), it becomes difficult to obtain a predetermined zoom ratio, which is not preferable.
【0021】この他、本発明において全変倍範囲にわた
り画面全体の光学性能を良好に維持しつつレンズ全長の
短縮化を図るには、次の諸条件の少なくとも1つを満足
させるのが良い。
In addition, in the present invention, at least one of the following conditions should be satisfied in order to shorten the total lens length while maintaining good optical performance of the entire screen over the entire zoom range.
【0022】(2−1)広角端における前記第2群の結
像倍率をβ2Wとしたとき、 2.5<β2T/β2W<3.1 ・・・・・・(3) なる条件を満足することである。
(2-1) When the imaging magnification of the second group at the wide-angle end is β2W, the condition of 2.5 <β2T / β2W <3.1 (3) is satisfied. That is.
【0023】条件式(3)は広角端と望遠端における第
2群の結像倍率の比に関するものである。条件式(3)
の上限値を越えて広角端と望遠端における第2群の結像
倍率の比が大きくなり過ぎると、ズーミングによる諸収
差の変動を補正するのが困難となる。又、条件式(3)
の下限値を越えて広角端と望遠端における第2群の結像
倍率の比が小さくなり過ぎると、所定の変倍効果を得る
ことが難しくなってくる。
Conditional expression (3) relates to the ratio of the image forming magnification of the second lens unit at the wide-angle end and the telephoto end. Conditional expression (3)
If the ratio of the image forming magnifications of the second lens group at the wide-angle end and the telephoto end becomes too large beyond the upper limit of, it becomes difficult to correct variations of various aberrations due to zooming. Also, conditional expression (3)
If the ratio of the image forming magnifications of the second lens group at the wide-angle end and the telephoto end becomes too small below the lower limit of, it becomes difficult to obtain a predetermined zoom effect.
【0024】(2−2)望遠端における第1レンズ面か
ら最終レンズ面までの軸上距離をΣDTとしたとき、 0.1<ΣDT/fT<0.15 ・・・・・・(4) なる条件を満足することである。
(2-2) When the axial distance from the first lens surface to the final lens surface at the telephoto end is ΣDT, 0.1 <ΣDT / fT <0.15 (4) To satisfy the condition.
【0025】条件式(4)は望遠端における第1レンズ
面から最終レンズ面までの軸上距離と望遠端における全
系の焦点距離の比に関するものである。条件式(4)の
上限値を越えて望遠端における第1レンズ面から最終レ
ンズ面までの軸上距離が長くなり過ぎると、沈胴によっ
てカメラ厚を薄くすることが困難となる。又、条件式
(4)の下限値を越えて望遠端における第1レンズ面か
ら最終レンズ面までの軸上距離が短くなり過ぎると、良
好なる収差補正を行なう為のレンズ構成を確保すること
が困難となる。
Conditional expression (4) relates to the ratio of the axial distance from the first lens surface to the final lens surface at the telephoto end and the focal length of the entire system at the telephoto end. If the axial distance from the first lens surface to the final lens surface at the telephoto end becomes too long beyond the upper limit of conditional expression (4), it becomes difficult to reduce the camera thickness by collapsing. Further, if the axial distance from the first lens surface to the final lens surface at the telephoto end becomes too short beyond the lower limit of conditional expression (4), it is possible to secure a lens configuration for performing good aberration correction. It will be difficult.
【0026】(2−3)前記第2群の物体側のレンズ面
から像面側のレンズ面までの軸上距離をΣD2、広角端
におけるバックフォーカスをSKWとしたとき、 0.3<ΣD2/SKW<1.5 ・・・・・・(5) なる条件を満足することである。
(2-3) When the axial distance from the object-side lens surface of the second group to the image-side lens surface is ΣD2, and the back focus at the wide-angle end is SKW, 0.3 <ΣD2 / SKW <1.5 (5) It is to satisfy the condition.
【0027】条件式(5)は第2群の最も物体側のレン
ズ面から最も像面側のレンズ面までの軸上距離と、広角
端におけるバックフォーカスの比に関するものである。
条件式(5)の上限値を越えて広角端におけるバックフ
ォーカスが短くなり過ぎると、後玉レンズ径が大きくな
るので良くない。又、条件式(5)の下限値を越えて広
角端におけるバックフォーカスが長くなり過ぎると、広
角端付近におけるコマ、フレアーを良好に補正するのが
困難になるので良くない。
Conditional expression (5) relates to the ratio of the back focus at the wide-angle end to the axial distance from the lens surface closest to the object side to the lens surface closest to the image side of the second lens unit.
If the back focus at the wide-angle end becomes too short beyond the upper limit of conditional expression (5), the rear lens diameter will become large, which is not good. If the back focus at the wide-angle end becomes too long beyond the lower limit of conditional expression (5), it becomes difficult to satisfactorily correct coma and flare near the wide-angle end.
【0028】尚、本発明において更に全変倍範囲にわた
り画面全体の光学性能を良好に維持する為には、前述の
条件式(1)〜(5)の数値範囲を次の如く設定するの
が良い。
In order to maintain good optical performance of the entire screen over the entire zoom range in the present invention, the numerical ranges of the above conditional expressions (1) to (5) are set as follows. good.
【0029】 3.9 <β2T <4.4 2.3 <fT /Y <2.6 2.5 <β2T/β2W <2.9 0.125<ΣDT/fT <0.145 0.5 <ΣD2/SKW <1.5 次に本発明の数値実施例を示す。数値実施例においてR
iは物体側より順に第i番目のレンズ面の曲率半径、D
iは物体側より第i番目のレンズ厚及び空気間隔、Ni
とνiは各々物体側より順に第i番目のレンズのガラス
の屈折率とアッベ数である。
3.9 <β2T <4.4 2.3 <fT / Y <2.6 2.5 <β2T / β2W <2.9 0.125 <ΣDT / fT <0.145 0.5 <ΣD2 / SKW <1.5 Next, numerical examples of the present invention will be shown. R in numerical examples
i is the radius of curvature of the i-th lens surface in order from the object side, D
i is the i-th lens thickness from the object side and the air gap, Ni
And νi are the refractive index and Abbe number of the glass of the i-th lens in order from the object side.
【0030】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。
Table 1 shows the relationship between the above-mentioned conditional expressions and various numerical values in the numerical examples.
【0031】非球面形状は光軸方向にX軸、光軸と垂直
方向にH軸、光の進行方向を正としRを近軸曲率半径、
A,B,C,D,Eを各々非球面係数としたとき、
The aspherical shape has an X axis in the optical axis direction, an H axis in the direction perpendicular to the optical axis, a positive traveling direction, and R is a paraxial radius of curvature,
When A, B, C, D and E are aspherical coefficients,
【0032】[0032]
【数1】 なる式で表わしている。又、「e−X」は「10-X」を
意味している。 (数値実施例1) F= 39.20〜111.50 FNO= 1:3.91 〜11.13 2ω= 57.8〜22.0 R 1= 25.06 D 1= 1.80 N 1=1.688930 ν 1= 31.1 R 2= 40.42 D 2= 1.09 R 3= -23.04 D 3= 1.50 N 2=1.846659 ν 2= 23.8 R 4= -55.97 D 4= 3.83 R 5= -335.53 D 5= 2.00 N 3=1.487490 ν 3= 70.2 R 6= -24.09 D 6= 0.10 R 7= -131.36 D 7= 3.00 N 4=1.487490 ν 4= 70.2 R 8= -15.01 D 8= 0.50 R 9= 絞り D 9=可変 R10= -43.62 D10= 0.05 N 5=1.524210 ν 5= 51.4 R11= -110.00 D11= 2.83 N 6=1.672700 ν 6= 32.1 R12= -23.23 D12= 3.75 R13= -10.61 D13= 1.30 N 7=1.804000 ν 7= 46.6 R14= -61.58 非球面係数 4面 K=0 A=0 B= 6.114e-05 C= 3.359e-07 D= 4.37
6e-09 E= 0 10面 K=0 A=0 B= 7.369e-05 C= 1.813e-07 D= 5.3
32e-09 E=-1.463e-11
[Equation 1] It is expressed by Further, "e-X" means "10 -X ". (Numerical Example 1) F = 39.20 to 111.50 FNO = 1: 3.91 to 11.13 2ω = 57.8 to 22.0 R 1 = 25.06 D 1 = 1.80 N 1 = 1.688930 ν 1 = 31.1 R 2 = 40.42 D 2 = 1.09 R 3 = -23.04 D 3 = 1.50 N 2 = 1.846659 ν 2 = 23.8 R 4 = -55.97 D 4 = 3.83 R 5 = -335.53 D 5 = 2.00 N 3 = 1.487490 ν 3 = 70.2 R 6 = -24.09 D 6 = 0.10 R 7 = -131.36 D 7 = 3.00 N 4 = 1.487490 ν 4 = 70.2 R 8 = -15.01 D 8 = 0.50 R 9 = Aperture D 9 = Variable R10 = -43.62 D10 = 0.05 N 5 = 1.524210 ν 5 = 51.4 R11 = -110.00 D11 = 2.83 N 6 = 1.672700 ν 6 = 32.1 R12 = -23.23 D12 = 3.75 R13 = -10.61 D13 = 1.30 N 7 = 1.804000 ν 7 = 46.6 R14 = -61.58 Aspheric coefficient 4 faces K = 0 A = 0 B = 6.114e-05 C = 3.359e-07 D = 4.37
6e-09 E = 0 10 side K = 0 A = 0 B = 7.369e-05 C = 1.813e-07 D = 5.3
32e-09 E = -1.463e-11
【0033】[0033]
【表1】 (数値実施例2) F= 36.19〜101.50 FNO= 1:3.91 〜10.98 2ω= 61.7〜24.1 R 1= 21.99 D 1= 1.80 N 1=1.698947 ν 1= 30.1 R 2= 28.62 D 2= 1.23 R 3= -22.90 D 3= 1.50 N 2=1.846659 ν 2= 23.8 R 4= -47.08 D 4= 4.10 R 5= -185.43 D 5= 2.00 N 3=1.487490 ν 3= 70.2 R 6= -21.52 D 6= 0.11 R 7= -120.30 D 7= 3.00 N 4=1.487490 ν 4= 70.2 R 8= -16.51 D 8= 0.50 R 9= 絞り D 9=可変 R10= -44.51 D10= 1.00 N 5=1.583126 ν 5= 59.4 R11= 101.21 D11= 0.08 R12= 107.43 D12= 2.83 N 6=1.581439 ν 6= 40.8 R13= -28.61 D13= 5.32 R14= -12.13 D14= 1.30 N 7=1.804000 ν 7= 46.6 R15= -49.39 非球面係数 4面 K=0 A=0 B= 5.655e-05 C= 2.159e-07 D= 1.57
5e-09 E= 0 10面 K=0 A=0 B= 4.656e-05 C=-6.328e-08 D= 5.0
66e-09 E=-2.330e-11
[Table 1] (Numerical Example 2) F = 36.19 to 101.50 FNO = 1: 3.91 to 10.98 2ω = 61.7 to 24.1 R 1 = 21.99 D 1 = 1.80 N 1 = 1.698947 ν 1 = 30.1 R 2 = 28.62 D 2 = 1.23 R 3 = -22.90 D 3 = 1.50 N 2 = 1.846659 ν 2 = 23.8 R 4 = -47.08 D 4 = 4.10 R 5 = -185.43 D 5 = 2.00 N 3 = 1.487490 ν 3 = 70.2 R 6 = -21.52 D 6 = 0.11 R 7 = -120.30 D 7 = 3.00 N 4 = 1.487490 ν 4 = 70.2 R 8 = -16.51 D 8 = 0.50 R 9 = Aperture D 9 = Variable R10 = -44.51 D10 = 1.00 N 5 = 1.583126 ν 5 = 59.4 R11 = 101.21 D11 = 0.08 R12 = 107.43 D12 = 2.83 N 6 = 1.581439 ν 6 = 40.8 R13 = -28.61 D13 = 5.32 R14 = -12.13 D14 = 1.30 N 7 = 1.804000 ν 7 = 46.6 R15 = -49.39 Aspherical surface 4 faces K = 0 A = 0 B = 5.655e-05 C = 2.159e-07 D = 1.57
5e-09 E = 0 10 side K = 0 A = 0 B = 4.656e-05 C = -6.328e-08 D = 5.0
66e-09 E = -2.330e-11
【0034】[0034]
【表2】 (数値実施例3) F= 39.20〜101.50 FNO= 1:3.91 〜10.13 2ω= 57.8〜24.1 R 1= 22.63 D 1= 1.80 N 1=1.603420 ν 1= 38.0 R 2= 34.50 D 2= 1.14 R 3= -22.09 D 3= 1.50 N 2=1.805181 ν 2= 25.4 R 4= -52.03 D 4= 2.80 R 5= -115.74 D 5= 2.00 N 3=1.487490 ν 3= 70.2 R 6= -23.31 D 6= 0.50 R 7= -65.62 D 7= 3.00 N 4=1.487490 ν 4= 70.2 R 8= -12.56 D 8= 0.50 R 9= 絞り D 9=可変 R10= -44.74 D10= 3.68 N 5=1.647689 ν 5= 33.8 R11= -15.69 D11= 2.91 R12= -10.30 D12= 1.30 N 6=1.804000 ν 6= 46.6 R13= -317.68 非球面係数 4面 K=0 A=0 B= 9.012e-05 C= 6.727e-07
D= 4.564e-09E= 0 12面 K= 2.832e-02 A=0 B= 6.416e-05 C= 9.154e-0
7 D=-8.559e-09E= 1.463e-10
[Table 2] (Numerical Example 3) F = 39.20 to 10.51 FNO = 1: 3.91 to 10.13 2 ω = 57.8 to 24.1 R 1 = 22.63 D 1 = 1.80 N 1 = 1.603420 ν 1 = 38.0 R 2 = 34.50 D 2 = 1.14 R 3 = -22.09 D 3 = 1.50 N 2 = 1.805181 ν 2 = 25.4 R 4 = -52.03 D 4 = 2.80 R 5 = -115.74 D 5 = 2.00 N 3 = 1.487490 ν 3 = 70.2 R 6 = -23.31 D 6 = 0.50 R 7 = -65.62 D 7 = 3.00 N 4 = 1.487490 ν 4 = 70.2 R 8 = -12.56 D 8 = 0.50 R 9 = Aperture D 9 = Variable R10 = -44.74 D10 = 3.68 N 5 = 1.647689 ν 5 = 33.8 R11 = -15.69 D11 = 2.91 R12 = -10.30 D12 = 1.30 N 6 = 1.804000 ν 6 = 46.6 R13 = -317.68 Four aspherical surfaces K = 0 A = 0 B = 9.012e-05 C = 6.727e-07
D = 4.564e-09E = 0 12 sides K = 2.832e-02 A = 0 B = 6.416e-05 C = 9.154e-0
7 D = -8.559e-09E = 1.463e-10
【0035】[0035]
【表3】 (数値実施例4) F= 39.20〜101.50 FNO= 1:3.91 〜10.13 2ω= 57.8〜24.1 R 1= 23.37 D 1= 1.80 N 1=1.647689 ν 1= 33.8 R 2= 35.58 D 2= 1.05 R 3= -22.74 D 3= 1.50 N 2=1.805181 ν 2= 25.4 R 4= -56.13 D 4= 3.52 R 5= -330.67 D 5= 2.00 N 3=1.487490 ν 3= 70.2 R 6= -25.01 D 6= 0.20 R 7= -110.78 D 7= 3.00 N 4=1.487490 ν 4= 70.2 R 8= -14.16 D 8= 0.50 R 9= 絞り D 9=可変 R10= -50.59 D10= 2.88 N 5=1.688930 ν 5= 31.1 R11= -23.63 D11= 3.75 R12= -10.62 D12= 1.30 N 6=1.804000 ν 6= 46.6 R13= -61.58 非球面係数 4面 K=0 A=0 B= 7.235e-05 C= 4.442e-07 D= 3.92
0e-09 E= 0 10面 K=0 A=0 B= 5.538e-05 C= 2.240e-07 D= 1.9
37e-09 E= 6.216e-12
[Table 3] (Numerical Example 4) F = 39.20 to 10.51 FNO = 1: 3.91 to 10.13 2 ω = 57.8 to 24.1 R 1 = 23.37 D 1 = 1.80 N 1 = 1.647689 ν 1 = 33.8 R 2 = 35.58 D 2 = 1.05 R 3 = -22.74 D 3 = 1.50 N 2 = 1.805181 ν 2 = 25.4 R 4 = -56.13 D 4 = 3.52 R 5 = -330.67 D 5 = 2.00 N 3 = 1.487490 ν 3 = 70.2 R 6 = -25.01 D 6 = 0.20 R 7 = -110.78 D 7 = 3.00 N 4 = 1.487490 ν 4 = 70.2 R 8 = -14.16 D 8 = 0.50 R 9 = Aperture D 9 = Variable R10 = -50.59 D10 = 2.88 N 5 = 1.688930 ν 5 = 31.1 R11 = -23.63 D11 = 3.75 R12 = -10.62 D12 = 1.30 N 6 = 1.804000 ν 6 = 46.6 R13 = -61.58 Aspheric coefficient 4 faces K = 0 A = 0 B = 7.235e-05 C = 4.442e-07 D = 3.92
0e-09 E = 0 10 side K = 0 A = 0 B = 5.538e-05 C = 2.240e-07 D = 1.9
37e-09 E = 6.216e-12
【0036】[0036]
【表4】 [Table 4]
【0037】[0037]
【表5】 [Table 5]
【0038】[0038]
【発明の効果】本発明によれば所定の屈折力の2つのレ
ンズ群を移動させて変倍を行うズームレンズの各レンズ
群のレンズ構成を前述の如く設定することにより、レン
ズ全長の短縮化を図った変倍比3程度の全変倍範囲にわ
たり高い光学性能を有した簡易な構成の小型のズームレ
ンズを達成することができる。
According to the present invention, the total lens length can be shortened by setting the lens configuration of each lens group of the zoom lens that performs zooming by moving two lens groups having a predetermined refractive power. It is possible to achieve a small-sized zoom lens having a simple configuration, which has high optical performance over the entire zooming range with a zooming ratio of about 3.
【図面の簡単な説明】[Brief description of drawings]
【図1】 本発明の数値実施例1のレンズ断面図FIG. 1 is a lens cross-sectional view of Numerical Example 1 of the present invention.
【図2】 本発明の数値実施例2のレンズ断面図FIG. 2 is a lens cross-sectional view of Numerical Example 2 of the present invention.
【図3】 本発明の数値実施例3のレンズ断面図FIG. 3 is a lens cross-sectional view of Numerical Example 3 of the present invention.
【図4】 本発明の数値実施例4のレンズ断面図FIG. 4 is a lens cross-sectional view of Numerical Example 4 of the present invention.
【図5】 本発明の数値実施例1の広角端の収差図FIG. 5 is an aberration diagram at the wide-angle end according to Numerical Example 1 of the present invention.
【図6】 本発明の数値実施例1の中間の収差図FIG. 6 is an intermediate aberration diagram of Numerical example 1 of the present invention.
【図7】 本発明の数値実施例1の望遠端の収差図FIG. 7 is an aberration diagram at a telephoto end according to Numerical Example 1 of the present invention.
【図8】 本発明の数値実施例2の広角端の収差図FIG. 8 is an aberration diagram at a wide-angle end according to Numerical Example 2 of the present invention.
【図9】 本発明の数値実施例2の中間の収差図FIG. 9 is an intermediate aberration diagram of Numerical example 2 of the present invention.
【図10】 本発明の数値実施例2の望遠端の収差図FIG. 10 is an aberration diagram at a telephoto end according to Numerical Example 2 of the present invention.
【図11】 本発明の数値実施例3の広角端の収差図FIG. 11 is an aberration diagram at a wide-angle end according to Numerical Example 3 of the present invention.
【図12】 本発明の数値実施例3の中間の収差図FIG. 12 is an intermediate aberration diagram of Numerical Example 3 of the present invention.
【図13】 本発明の数値実施例3の望遠端の収差図FIG. 13 is an aberration diagram at a telephoto end according to Numerical Example 3 of the present invention.
【図14】 本発明の数値実施例4の広角端の収差図FIG. 14 is an aberration diagram at the wide-angle end according to Numerical Example 4 of the present invention.
【図15】 本発明の数値実施例4の中間の収差図FIG. 15 is an intermediate aberration diagram of Numerical Example 4 of the present invention.
【図16】 本発明の数値実施例4の望遠端の収差図FIG. 16 is an aberration diagram at a telephoto end according to Numerical Example 4 of the present invention.
【符号の説明】[Explanation of symbols]
L1 第1群 L2 第2群 SP 絞り IP 像面 d d線 g g線 M メリディオナル像面 S サジタル像面 L1 1st group L2 2nd group SP aperture IP image plane d d line g g line M meridional image plane S sagittal image plane

Claims (4)

    【特許請求の範囲】[Claims]
  1. 【請求項1】 物体側より順に正の屈折力の第1群と負
    の屈折力の第2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、該第1群は少なくとも2つの正レンズを有し、該第
    2群は正レンズと該正レンズの像面側に1つのみの負レ
    ンズを有し、望遠端における該第2群の結像倍率をβ2
    T、望遠端における全系の焦点距離をfT、有効画面の
    対角線長をYとしたとき、 3.6<β2T <5.0 2.2<fT/Y<3.0 なる条件を満足することを特徴とする小型のズームレン
    ズ。
    1. A compact zoom lens system having two lens units, a first lens unit having a positive refractive power and a second lens unit having a negative refractive power, which are arranged in order from the object side, and performing zooming by changing the distance between both lens units. In the lens, the first group has at least two positive lenses, the second group has a positive lens and only one negative lens on the image plane side of the positive lens, and the second group at the telephoto end. The imaging magnification of β2
    When T is the focal length of the entire system at the telephoto end and f is the diagonal length of the effective screen, the condition of 3.6 <β2T <5.0 2.2 <fT / Y <3.0 must be satisfied. A compact zoom lens featuring.
  2. 【請求項2】 広角端における前記第2群の結像倍率を
    β2Wとしたとき、 2.5<β2T/β2W<3.1 なる条件を満足することを特徴とする請求項1の小型の
    ズームレンズ。
    2. The compact zoom lens according to claim 1, wherein the condition 2.5 <β2T / β2W <3.1 is satisfied, where β2W is the imaging magnification of the second lens unit at the wide-angle end. lens.
  3. 【請求項3】 望遠端における第1レンズ面から最終レ
    ンズ面までの軸上距離をΣDTとしたとき、 0.1<ΣDT/fT<0.15 なる条件を満足することを特徴とする請求項1の小型の
    ズームレンズ。
    3. When the axial distance from the first lens surface to the final lens surface at the telephoto end is ΣDT, the condition of 0.1 <ΣDT / fT <0.15 is satisfied. 1 small zoom lens.
  4. 【請求項4】 前記第2群の物体側のレンズ面から像面
    側のレンズ面までの軸上距離をΣD2、広角端における
    バックフォーカスをSKWとしたとき、 0.3<ΣD2/SKW<1.5 なる条件を満足することを特徴とする請求項1の小型の
    ズームレンズ。
    4. When the axial distance from the object-side lens surface to the image-side lens surface of the second lens unit is ΣD2 and the back focus at the wide angle end is SKW, 0.3 <ΣD2 / SKW <1 The compact zoom lens according to claim 1, wherein the condition (5) is satisfied.
JP6121982A 1994-05-11 1994-05-11 Compact zoom lens Pending JPH07306361A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6121982A JPH07306361A (en) 1994-05-11 1994-05-11 Compact zoom lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6121982A JPH07306361A (en) 1994-05-11 1994-05-11 Compact zoom lens

Publications (1)

Publication Number Publication Date
JPH07306361A true JPH07306361A (en) 1995-11-21

Family

ID=14824650

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JPH07306361A (en)

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JP2000193885A (en) * 1998-12-24 2000-07-14 Asahi Optical Co Ltd Zoom lens system
US6922290B2 (en) 2002-06-14 2005-07-26 Pentax Corporation Zoom lens system
CN108490582A (en) * 2018-03-29 2018-09-04 广东旭业光电科技股份有限公司 A kind of imaging lens and the image capture device with the imaging lens
US10520704B2 (en) 2017-01-19 2019-12-31 Largan Precision Co., Ltd. Optical image assembly, image capturing apparatus and electronic device
US10698178B2 (en) 2018-08-10 2020-06-30 Largan Precision Co., Ltd. Imaging optical lens assembly, image capturing unit and electronic device

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JP2000193885A (en) * 1998-12-24 2000-07-14 Asahi Optical Co Ltd Zoom lens system
US6922290B2 (en) 2002-06-14 2005-07-26 Pentax Corporation Zoom lens system
US10520704B2 (en) 2017-01-19 2019-12-31 Largan Precision Co., Ltd. Optical image assembly, image capturing apparatus and electronic device
CN108490582A (en) * 2018-03-29 2018-09-04 广东旭业光电科技股份有限公司 A kind of imaging lens and the image capture device with the imaging lens
CN108490582B (en) * 2018-03-29 2020-11-24 广东旭业光电科技股份有限公司 Imaging lens and image acquisition equipment with same
US10698178B2 (en) 2018-08-10 2020-06-30 Largan Precision Co., Ltd. Imaging optical lens assembly, image capturing unit and electronic device

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