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JPH0413109A - Compact zoom lens - Google Patents

Compact zoom lens

Info

Publication number
JPH0413109A
JPH0413109A JP2115843A JP11584390A JPH0413109A JP H0413109 A JPH0413109 A JP H0413109A JP 2115843 A JP2115843 A JP 2115843A JP 11584390 A JP11584390 A JP 11584390A JP H0413109 A JPH0413109 A JP H0413109A
Authority
JP
Japan
Prior art keywords
lens
positive
negative
lens component
object side
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.)
Granted
Application number
JP2115843A
Other languages
Japanese (ja)
Other versions
JP2750775B2 (en
Inventor
Noriyuki Adachi
宣幸 安達
Hiroshi Miyamae
宮前 博
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.)
Konica Minolta Inc
Original Assignee
Konica Minolta 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 Konica Minolta Inc filed Critical Konica Minolta Inc
Priority to JP2115843A priority Critical patent/JP2750775B2/en
Priority to US07/689,559 priority patent/US5202992A/en
Publication of JPH0413109A publication Critical patent/JPH0413109A/en
Application granted granted Critical
Publication of JP2750775B2 publication Critical patent/JP2750775B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

PURPOSE:To make the zoom lens compact and to decrease aberrational variation by giving relatively low negative refracting power to a 5th lens element which is fixed at the time of power variation. CONSTITUTION:A 1st lens element consists of one positive tablet composed of a negative meniscus lens and a biconvex lens and a positive meniscus lens which is convex to the object side in order from the object side and a 2nd lens element II consists of a negative lens which has a large-curvature surface on the image side and a negative tablet composed of a biconcave lens and a positive lens in order from the object side and a 3rd lens element III is one positive lens or a positive tablet composed of one positive lens and a negative meniscus lens; and a 4th lens element IV includes at least a negative lens having a large-curvature surface on the image side and one positive lens in order from the object side and the 5th lens V is composed of a single negative lens which has relatively weak refracting power. Consequently, the zoom lens is made compact, various aberrations are compensated excellently, and variation of the various aberrations due to power variation is reducible.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明はズームレンズ、特にビデオカメラ等に好適なコ
ンパクトで明るく、高変倍此のズームレンズに関する。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a zoom lens, and in particular to a compact, bright, and high variable power zoom lens suitable for video cameras and the like.

(従来技術) 従来より、ビデオカメラ等に用いられる明るく、高変倍
此のズームレンズとして、特開昭62−24213号公
報や特開昭63−123009号公報に見られる様に、
物体側から順に正、負、正、正の各屈折力を有する4レ
ンズ成分からから構成され、変倍中筒ルンズ成分と第3
レンズ成分とを固定のままとし、第2レンズ成分を一方
向に移動させて変倍を行ない、第4レンズ成分を前後に
移動させることによって変倍に伴う焦点位置の変動の補
正を行うものが知られている。
(Prior art) As seen in Japanese Patent Application Laid-open No. 62-24213 and Japanese Patent Application Laid-Open No. 63-123009, as a bright, high-power zoom lens used in video cameras, etc.
Consists of four lens components having positive, negative, positive, and positive refractive powers in order from the object side, including a variable magnification middle barrel lens component and a third lens component.
The lens component remains fixed, the second lens component is moved in one direction to change the magnification, and the fourth lens component is moved back and forth to compensate for fluctuations in the focal position due to the change in magnification. Are known.

(この発明が解決しようとする問題点)この方式のズー
ムレンズは変倍に伴う像面位置の補正のための第4レン
ズ成分の移動量が比較的大きく、レンズ系をコンパクト
にしようとして全系を縮小してゆくと、変倍に伴う収差
の変動を十分に補正できなくなるという欠点があった。
(Problems to be Solved by the Invention) In this type of zoom lens, the amount of movement of the fourth lens component for correcting the image plane position accompanying zooming is relatively large, and in order to make the lens system compact, the entire system As the lens size is reduced, there is a drawback that variations in aberrations caused by zooming cannot be sufficiently corrected.

本発明の目的は、ビデオカメラ等に好適で、変倍比6倍
程度、Fナンバー1.4〜2.0程度で。
The purpose of the present invention is to use a camera suitable for video cameras and the like, with a variable magnification ratio of about 6 times and an F number of about 1.4 to 2.0.

構成枚数が少なく、全長、前玉径共にコンパクトであり
ながら上記の欠点を含まないズームレンズを提供するこ
とにある。
It is an object of the present invention to provide a zoom lens having a small number of lenses, compact in overall length and front lens diameter, and free from the above-mentioned drawbacks.

(問題を解決するための手段) 本発明のズームレンズは、基本的には、物体側から順に
、正の屈折力を有し、変倍時に固定のままである第ルン
ズ成分、負の屈折力を有し、変倍の為に前後に移動する
第2レンズ成分、正の屈折力を有し変倍時に固定のまま
である第3レンズ成分、正の屈折力を有し、変倍に伴う
焦点位置の移動を補正する第4レンズ成分、変倍時に固
定のままである第5レンズ成分から構成され、第5レン
ズ成分は、比較的弱い負の屈折力を有することを特徴と
する。
(Means for Solving the Problem) Basically, the zoom lens of the present invention has, in order from the object side, a positive refractive power, a first lens component that remains fixed during zooming, and a negative refractive power. A second lens component that has a positive refractive power and moves back and forth to change the power, a third lens component that has a positive refractive power and remains fixed during the change of power, and a third lens component that has a positive refractive power and moves back and forth as the power changes. It is composed of a fourth lens component that corrects movement of the focal position, and a fifth lens component that remains fixed during zooming, and the fifth lens component is characterized by having a relatively weak negative refractive power.

第2レンズ成分は広角側から望遠側に変倍するとき、物
体側から像側に移動する。
The second lens component moves from the object side to the image side when changing the magnification from the wide-angle side to the telephoto side.

第4レンズ成分に入射する光束はほぼアフォーカルにな
っていることがのぞましい。
It is preferable that the light beam incident on the fourth lens component be substantially afocal.

本発明のズームレンズにおいて、フォーカシングは第4
レンズ成分によることが望ましいが、第ルンズ成分ある
いは第3レンズ成分によってもよい。
In the zoom lens of the present invention, focusing is performed at the fourth lens.
Although it is preferable to use a lens component, it is also possible to use a first lens component or a third lens component.

本発明のズームレンズは具体的には、第ルンズ成分は少
なくとも1枚の正レンズと少なくとも1枚の負レンズを
含み、第2レンズ成分は少なくとも2枚の負レンズと少
なくとも1枚の正レンズからなり、第3レンズ成分は少
なくとも1枚の正レンズからなり、第4レンズ成分は少
なくとも1枚の正レンズと少なくとも1枚の負レンズを
含み、第5レンズ成分は少なくとも1枚の負レンズから
なり、以下の条件を満足している。
Specifically, in the zoom lens of the present invention, the first lens component includes at least one positive lens and at least one negative lens, and the second lens component includes at least two negative lenses and at least one positive lens. The third lens component includes at least one positive lens, the fourth lens component includes at least one positive lens and at least one negative lens, and the fifth lens component includes at least one negative lens. , satisfies the following conditions.

0.25<IfiFw/(fwZ)<0.4     
(1)1.8< f 、/ f w<2.5     
  (2)但し、flは、第2レンズ成分の合成焦点距
離、fwは全系の広角端の焦点距離、F−は広角端のF
ナンバー、2は変倍比である。
0.25<IfiFw/(fwZ)<0.4
(1) 1.8< f , / f w<2.5
(2) However, fl is the combined focal length of the second lens component, fw is the focal length of the entire system at the wide-angle end, and F- is F at the wide-angle end.
The number 2 is the variable power ratio.

第4レンズ成分もしくは第5レンズ成分中に非球面を導
入することが望ましいが、そのうち少なくとも1面は、
その軸上曲率半径を曲率半径として持つ母球面に関し母
球面が凸の面に対しては、屈折面の中心から周辺に向か
って凸を向けた方向に変形量を有する非球面であり、母
球面が凹の面に対しては、屈折面の中心から周辺に向か
って凹を向けた方向に変形量を有する非球面であって、
物体側から順にj番目の非球面の有効半径位置での変型
量をΔ1としたとき、上記の方向を正の向きとして、 0.001<FwΣΔt/ f w<O’、02  ’
  (3)であることが望ましい6但しΣは第4レンズ
成分および第5レンズ成分中のすべての非球面について
の和である3 本発明のズームレンズは、更に具体的には、第ルンズ成
分は、物体側から順に、負のメニスカスレンズと両凸レ
ンズからなる1組の正のダブレット、及び物体側に凸を
向けた正のメニスカスレンズとから構成され、第2レン
ズ成分は、物体側から順に、像側に強い面を向けた負レ
ンズ、及び両凹レンズと正レンズからなる負のダブレッ
トとから構成され、第3レンズ成分は、1枚の正レンズ
もしくは、1枚の正レンズと負のメニスカスレンズから
なる正のダブレットであり、第4レンズ成分は、少なく
とも、像側に強い面を向けた負レンズ、1枚の正レンズ
を物体側から順に含み、第5レンズ成分は、比較的弱い
屈折力を有する負の単レンズからなり、以下の各条件を
満足することが望ましい。
It is desirable to introduce an aspherical surface into the fourth lens component or the fifth lens component, and at least one of them is
For a surface whose curvature radius is the radius of curvature on its axis, and whose surface is convex, it is an aspheric surface that has deformation in the direction from the center of the refracting surface to the periphery, and the surface of the genera is aspheric. For a concave surface, it is an aspherical surface that has a deformation amount in the direction of concaveness from the center of the refractive surface toward the periphery,
When the amount of deformation at the effective radius position of the j-th aspherical surface in order from the object side is Δ1, and the above direction is taken as a positive direction, 0.001<FwΣΔt/ f w<O', 02'
(3)6 However, Σ is the sum of all aspherical surfaces in the fourth lens component and the fifth lens component.3 In the zoom lens of the present invention, more specifically, the fourth lens component is , consisting of, in order from the object side, a pair of positive doublets consisting of a negative meniscus lens and a biconvex lens, and a positive meniscus lens with the convex facing toward the object side, and the second lens component is, in order from the object side, It consists of a negative lens with a strong surface facing the image side, and a negative doublet consisting of a biconcave lens and a positive lens, and the third lens component is one positive lens or one positive lens and a negative meniscus lens. The fourth lens component includes at least a negative lens with a strong surface facing the image side and one positive lens in order from the object side, and the fifth lens component has a relatively weak refractive power. It is desirable that the lens be composed of a negative single lens having

n2−>1.6            (4)ヤ、−
一ν2.>2C)          (5)n、・f
丁>1.8         (6)但し、 n2−:第2レンズ成分中の負レンズの屈折率の平均値 vz−:第2レンズ成分中の負レンズのアツベ数の平均
値 vz+:第2レンズ成分中の正レンズのアツベ数n、:
第3レンズ成分中の正レンズの屈折率である。
n2->1.6 (4) Ya, -
1ν2. >2C) (5)n, ・f
D>1.8 (6) However, n2-: Average value of the refractive index of the negative lens in the second lens component vz-: Average value of the Abbe number of the negative lens in the second lens component vz+: Second lens component Atsbe number n of the positive lens inside:
It is the refractive index of the positive lens in the third lens component.

第5レンズ成分は比較的弱い負の屈折力を有する上に、
他のレンズ成分と異なり、変倍に係わらず像面近傍に置
かれるため、温度、湿度等の環境変化による焦点位置変
動が少ないので、プラスチックレンズによって構成する
こともできる。
The fifth lens component has a relatively weak negative refractive power, and
Unlike other lens components, since it is placed near the image plane regardless of magnification, there is little variation in the focal position due to environmental changes such as temperature and humidity, so it can also be constructed from a plastic lens.

(作用) 本発明のズームレンズの基本的な構成中、最も像側に変
倍時に固定のままの第5レンズ成分を置くことは、変倍
比6倍径度の高変倍ズームレンズをコンパクトに構成す
る上できわめて効果的である。特に、第5レンズ成分の
屈折力を負とすることによって第4レンズ成分と第5レ
ンズ成分の合成系の望遠比を小さくできるので、第5レ
ンズ成分を置かない場合に比べてレンズ系の全長を短く
できる。また、ズーム系をコンパクトに構成しようとす
ると、第2レンズ成分で発生する負の歪曲収差が広角端
で補正が困難となりがちであるが。
(Function) In the basic configuration of the zoom lens of the present invention, placing the fifth lens component closest to the image side, which remains fixed during zooming, makes it possible to make a high-power zoom lens with a zoom ratio of 6x in a compact size. It is extremely effective in configuring In particular, by making the refractive power of the fifth lens component negative, the telephoto ratio of the composite system of the fourth lens component and the fifth lens component can be made smaller, so the total length of the lens system is longer than that of the case without the fifth lens component. can be shortened. Furthermore, when attempting to construct a zoom system compactly, it tends to be difficult to correct negative distortion generated in the second lens component at the wide-angle end.

負の屈折力の第5レンズ成分を置くことによってこのよ
うな効果を一部打ち消すことができるため。
This is because such an effect can be partially canceled by placing a fifth lens component with negative refractive power.

従来に比べてズーム系の全長や前玉径を小さくできる。The overall length of the zoom system and the diameter of the front lens can be made smaller than before.

第4レンズ成分に入射する光束をほぼアフォーカルにす
ることにより、変倍に伴う該成分の移動による収差変化
を少なくできる。また第4レンズ成分を物体側に繰り出
すことによってフォーカシングを行う場合、フォーカシ
ングに伴う該成分の移動による収差変化を少なくできる
By making the light flux incident on the fourth lens component substantially afocal, changes in aberration due to movement of this component due to zooming can be reduced. Furthermore, when focusing is performed by extending the fourth lens component toward the object side, aberration changes due to movement of the fourth lens component due to focusing can be reduced.

正の屈折力を有する第ルンズ成分及び第4レンズ成分に
それぞれ少なくとも1枚の負レンズ。
At least one negative lens is provided in each of the fourth lens component and the fourth lens component having positive refractive power.

負の屈折力を有する第2レンズ成分に少なくとも1枚の
正レンズが含まれているのは、変倍の全領域において軸
上の色収差および倍率の色収差の補正を十分に行う為で
ある。正の屈折力を有する第3レンズ成分には必ずしも
負レンズが含まれてはいないが、第4レンズ成分の色補
正を過剰にバランスさせることによって、これを省略し
ても全系の色収差の補正をすることができる。
The reason why the second lens component having negative refractive power includes at least one positive lens is to sufficiently correct axial chromatic aberration and lateral chromatic aberration in the entire range of magnification. Although the third lens component with positive refractive power does not necessarily include a negative lens, by overbalancing the color correction of the fourth lens component, the chromatic aberration of the entire system can be corrected even if this component is omitted. can do.

゛第2レンズ成分に少なくとも2枚の負レンズが含まれ
ているのは、第2レンズ成分に屈折力を十分に持たせ、
変倍のための移動量を小さくシ、前玉径をコンパクトに
するためである。
゛The reason why the second lens component includes at least two negative lenses is that the second lens component has sufficient refractive power.
This is to reduce the amount of movement required for zooming and to make the diameter of the front lens compact.

条件(1)は第2レンズ成分の焦点距離の適正値に関し
、上限を越えて焦点距離の絶対値が大きくなると収差補
正上は有利であるが、第ルンズ成分から第3レンズ成分
までの長さが増大し、コンパクトな系を得られない、下
限を越えると前述の様な簡素な構成では、変倍に伴う収
差変動、特に歪曲収差、コマ収差の変動が補正不可能と
なり、広角端での負の歪曲収差が過大となる。
Condition (1) concerns the appropriate value of the focal length of the second lens component; if the absolute value of the focal length exceeds the upper limit and becomes large, it is advantageous in terms of aberration correction, but the length from the first lens component to the third lens component increases, making it impossible to obtain a compact system.If the lower limit is exceeded, with a simple configuration such as the one described above, it becomes impossible to correct aberration fluctuations associated with zooming, especially fluctuations in distortion and coma, and Negative distortion becomes excessive.

条件(2)は、第4レンズ成分の焦点距離に関し、下限
を越えると、第4レンズ成分の前方から撮像面までの長
さは短くなる傾向となり、全長の短縮化には有利である
が、第4レンズ成分全体の画角が大きくなり、画面隅に
入射する光束が第一レンズ成分を通過する高さが高くな
り、前玉系の増大につながる。上限を越え焦点距離が長
くなると、レンズ系の全長が長くなるだけでなく、所定
の口径を得るための絞り径が大きくなる。
Condition (2) relates to the focal length of the fourth lens component, and if the lower limit is exceeded, the length from the front of the fourth lens component to the imaging surface tends to become shorter, which is advantageous for shortening the overall length. The angle of view of the entire fourth lens component becomes larger, and the height at which the light beam incident on the corner of the screen passes through the first lens component becomes higher, leading to an increase in the front lens system. When the focal length exceeds the upper limit and the focal length becomes longer, not only does the overall length of the lens system become longer, but also the aperture diameter to obtain a predetermined aperture becomes larger.

本発明のズームレンズの具体的な構成中、第ルンズ成分
が、物体側から順に、負のメニスカスレンズと両凸レン
ズからなる1組の正のダブレット、及び物体側に凸を向
けた正のメニスカスレンズとから構成されているのは、
主として中間焦点距離から望遠端にわたる球面収差およ
びコマ収差の変動を抑える為である。像側にある正のメ
ニスカスレンズは軸上光束に対してほぼアブラナチック
に構成されており、強い負の屈折力を有する第2レンズ
成分で発生する負の歪曲収差を補正する効果をも有する
In the specific configuration of the zoom lens of the present invention, the first lens component includes, in order from the object side, a positive doublet consisting of a negative meniscus lens and a biconvex lens, and a positive meniscus lens with the convex side facing the object side. It is composed of
This is mainly to suppress fluctuations in spherical aberration and coma aberration from the intermediate focal length to the telephoto end. The positive meniscus lens on the image side is configured almost abranatically with respect to the axial light beam, and also has the effect of correcting negative distortion generated in the second lens component having strong negative refractive power.

第2レンズ成分は、物体側から順に、像側に強い面を向
けた負レンズ、及び両凹レンズと負レンズからなる負の
ダブレットとから構成されているが、これによって主点
位置を物体側に寄せ厚肉化による全系の大型化を抑えつ
つ、変倍に伴う収差変動、特に歪曲収差や非点収差の変
動を少なくできる。
The second lens component is composed of, in order from the object side, a negative lens with a strong surface facing the image side, and a negative doublet consisting of a biconcave lens and a negative lens. While suppressing the increase in size of the entire system due to thickening, it is possible to reduce fluctuations in aberrations associated with zooming, especially fluctuations in distortion and astigmatism.

第3レンズ成分は、1枚の正レンズで構成されるが、こ
れを正レンズと負のメニスカスレンズからなる正のダブ
レットとすることにより、変倍全域での軸上の色収差の
補正が容易になる。また口径比の大きい場合には、面数
が増えたことによる自由度を主として球面収差の補正に
充てることが可能となる。第3レンズ成分が1枚の正レ
ンズで構成される場合、このレンズの少なくとも1面に
非球面を用いることが球面収差の補正上有利である。
The third lens component is composed of one positive lens, but by making it a positive doublet consisting of a positive lens and a negative meniscus lens, it is easy to correct axial chromatic aberration over the entire zoom range. Become. Furthermore, when the aperture ratio is large, the degree of freedom due to the increased number of surfaces can be used mainly for correcting spherical aberration. When the third lens component is composed of one positive lens, it is advantageous to use an aspheric surface on at least one surface of this lens in terms of correcting spherical aberration.

第4レンズ成分は、少なくとも、像側に強い面を向けた
負レンズ、少なくとも1枚の正レンズを物体側から順に
含んでいるが、負レンズの像側の強い凹面は第2レンズ
成分で発生する負の歪曲収差を補正する働きがある。
The fourth lens component includes at least a negative lens with a strong surface facing the image side and at least one positive lens in order from the object side, but the strong concave surface on the image side of the negative lens occurs in the second lens component. It has the function of correcting the negative distortion that occurs.

第4レンズ成分もしくは第5レンズ成分中の非球面のう
ち少なくとも1面を、その軸上曲率半径を曲率半径とし
て持つ母球面に関し、母球面が凸の面に対しては屈折面
の中心から周辺に向かって凸を向けた方向に変型量を有
する非球面であり、母球面が凹の面に対しては、屈折面
の中心から周辺に向かって凹を向けた方向に変型量を有
する非球面とすることは、ズーム系をコンパクトに構成
しようとする際、強い負の屈折力を有する第2レンズ成
分において発生する負の歪曲収差を十分に補正するうえ
で効果的である。
Regarding a geneatrix surface that has at least one of the aspheric surfaces in the fourth lens component or the fifth lens component as its radius of curvature on its axis, from the center to the periphery of the refractive surface for a surface where the generatrix surface is convex. It is an aspherical surface that has a deformation amount in the direction of convexity toward the periphery, and for a surface with a concave genera, an aspherical surface that has deformation amount in the direction of concaveness from the center of the refractive surface toward the periphery. This is effective in sufficiently correcting the negative distortion generated in the second lens component having strong negative refractive power when attempting to configure the zoom system compactly.

条件(3)は第4レンズ成分および第5レンズ成分中の
すべての非球面についての各レンズ面の有効径における
非球面変型量の和に関し、下限を超えると系全体をコン
パクトに構成しようとすると、広角端での負の歪曲収差
を補正することが困難となり、上限を超えると歪曲収差
の補正には有効であるが、変倍全域に渡って像面湾曲が
オーバーとなる。
Condition (3) concerns the sum of the aspherical deformation amounts at the effective diameter of each lens surface for all the aspherical surfaces in the fourth and fifth lens components. , it becomes difficult to correct negative distortion at the wide-angle end, and if the upper limit is exceeded, it is effective in correcting distortion, but the curvature of field becomes excessive over the entire zoom range.

条件(4)は第2レンズ成分を構成する負レンズの屈折
率番二関し、この条件をはずれると上述の構成の下では
広角端の負の歪曲収差が補正困難となる。
Condition (4) relates to the refractive index of the negative lens constituting the second lens component, and if this condition is violated, it becomes difficult to correct negative distortion at the wide-angle end under the above configuration.

条件(5)は第2レンズ成分を構成する負レンズと正レ
ンズのアツベ数の差に関し1条件をはずれると変倍時の
色収差の変動、特に倍率の色収差の変動が大きくなり、
広角端では像高の大きい方向に、望遠側では像高の小さ
い方向に短波長の結像点がシフト)しすぎる傾向となる
Condition (5) relates to the difference in Abbe number between the negative lens and the positive lens that constitute the second lens component.If the condition is violated, the fluctuation of chromatic aberration during zooming, especially the fluctuation of chromatic aberration of magnification, becomes large.
At the wide-angle end, the short wavelength imaging point tends to shift too much in the direction of larger image height, and at the telephoto end, in the direction of smaller image height.

条件(6)は第3レンズ成分を構成する正レンズの屈折
率に関し、条件をはずれると、変倍全域にわたって球面
収差の補正が困難となる。
Condition (6) relates to the refractive index of the positive lens constituting the third lens component, and if the condition is violated, it becomes difficult to correct spherical aberration over the entire zoom range.

(実施例) 以下、本発明の実施例を挙げる。(Example) Examples of the present invention will be given below.

実施例中にはプラスチックレンズが用いら九ているもの
があり、これらのレンズには*印が付しである。プラス
チックレンズには一般に、環境温度の変化による屈折率
の変化があるが1本発明の実施例では、各プラスチック
レンズの屈折力を最適に組合せることによって、屈折率
の変化に伴う焦点位置の変動を抑えている。プラスチッ
クレンズ材料としては、PC(ポリカーボネート)およ
び、PMMA (ポリメチルメタクリート)等が用いら
れる。これらの材料は温度に対して路線形に屈折力が変
化する。以下にデータを示す。
In some of the examples, plastic lenses are used, and these lenses are marked with an asterisk. Plastic lenses generally have a change in refractive index due to changes in environmental temperature, but in the embodiments of the present invention, by optimally combining the refractive powers of each plastic lens, changes in the focal position due to changes in refractive index can be prevented. is suppressed. As the plastic lens material, PC (polycarbonate), PMMA (polymethyl methacrylate), etc. are used. The refractive power of these materials changes linearly with temperature. The data is shown below.

PCPMMA 基準屈折率(20℃)  1.583  1.492屈
折率 (50で)  1.5788 1.4884実施
例における非球面係数の定義は次の通りである。
PCPMMA Reference refractive index (20° C.) 1.583 1.492 Refractive index (at 50) 1.5788 1.4884 The definition of the aspheric coefficient in the example is as follows.

C:非球面の近軸曲率 を表す。C: paraxial curvature of aspheric surface represents.

なお、表中の各記号は、Rは各屈折面の曲率半径、Dは
屈折面間隔、Nはレンズ材料の屈折率、シーは同じくア
ツベ数、fはレンズ全系の焦点距離、2ωは画角、Fは
Fナンバー、fBはバックフォーカスを示す。
In addition, each symbol in the table is as follows: R is the radius of curvature of each refractive surface, D is the distance between the refractive surfaces, N is the refractive index of the lens material, C is the Abbe number, f is the focal length of the entire lens system, and 2ω is the image angle, F is the F number, and fB is the back focus.

実施例1 f=7.20〜40.99    F : 1.64〜
2.402ω=51.4’〜8,84’    fs=
2.0RD      N      vイ 但し、 X:非球面の頂点を原点とし、光軸に沿って物体側から
像側に向かう座標 h:非球面の頂点を原点とし、光軸に垂直な座第11面 K = A4= A、 = A、 = A1.= 第18面 非球面係数 −1,94404 −4,57908X 1O−s 8.90194 X 10−” −5,39124x 10−″ 1.23222 X 10−” 非球面係数 有効半径 有効半径4.7 4.3 第11面 非球面係数 有効半径5.OK  =−1,
07994 K  = A、  = A、  = A、  = ALo= 可変間隔 −3,11174x 10 −7,81744X 10−’ 4.95831 X 10−’ −2,91924x to−” 2.94816X 10−” f       a 7.20   1.0 23.04  11.2 40.99  15.4 f□=29.404 f4=14.654 16.4 6.2 2.0 f2=−7,96O f、=−528,527 c         d 5.24    4.67 4.45    5,46 8.42    1.49 f3=30.138 実施例2 f =g、go〜49.98 =2.0〜2.6 2ω=51.546〜8.86″ f、=1.80 シー A4 = A、  = A、  = 八〇。= 第18面 K  = A4= A、 = A、 = A1゜= −4,49354X10−’ 9.15906 x lo−” −5,38924x10−’ 1.23222xIO−” 非球面係数 有効半径6,0 −3.58728 x 10 −5.38150 X 10−’ −1,59535X 10−7 −4.29237 x 10−’ 3.53996 X 10−1 可変間隔 f       a 8.80  1.0354 26.95 11.3604 49.98 15.8099 f1=30.031 f、=17.166 17.50 7.175 2.7255 f2=−8,253 f、=−81,908 c       d 8.5150 6.6236 7.3787 7.7599 11.9425 3.1961 f、=32.+86 実施例3 f=8.80〜50.00 F  : 2.0〜2.6 2ω=54.66゜ 〜9.40’ fB==1.8O 19」 11114.111 2.00 18] −50,791 1,50 1,51633 64,1 第11面 K = A、 = AG= A、 = 八〇。= 第18面 K = A、 = AG= A、 = A1゜= 可変間隔 8.80 27.01 50.00 非球面係数 有効半径 −2,11982 −4,49777x 1O−s 9.14945 X 10−@ −5,38926X 10−9 1.23222 X 10−10 非球面係数 有効半径 1.33922 X 10 −4.18551 X 10−’ 1.81397 X 10−7 −7.15397 X 10−g 4.83427 x 10−11 5.0 5.0 1.0354 11.3604 15.8099 17.50 7.175 2.7255 7.2151 6.0712 10.6739 7.9296 9.0735 4.4708 f1=29.982 f4=17.471 f2=−8,234 f、=−76,932 f、=32,662 14冒 −30,549 実施例4 f=9.27〜52.80 2ω=49.2″ 〜8.4゜ F  : 1.44〜1.98 fB=4.78 第19面 非球面係数 有効半径 K = −7,58103X 10−’第21面 非球
面係数 有効半径 に=  −1,69524 可変間隔 9.27 19.50 52.80 8.029 5.929 8.050 25.600 12.700 1.000 1.100 14.000 25.700 8.3 7.6 1.185 3.300 11.692 f1=48.09    f2=−12,51f3=3
9.58f4=20.94    f5=−1344,
01各実施例における諸値は次の通りである。
Example 1 f=7.20~40.99 F: 1.64~
2.402ω=51.4'~8,84' fs=
2.0RD N v B However, X: Coordinate from the object side to the image side along the optical axis with the apex of the aspherical surface as the origin h: Eleventh surface perpendicular to the optical axis with the apex of the aspherical surface as the origin K = A4 = A, = A, = A1. = 18th surface aspherical coefficient -1,94404 -4,57908X 1O-s 8.90194 X 10-" -5,39124x 10-" 1.23222 .3 11th surface Aspheric coefficient Effective radius 5.OK = -1,
07994 K = A, = A, = A, = ALo= Variable interval -3,11174x 10 -7,81744X 10-' 4.95831 X 10-' -2,91924x to-" 2.94816X 10-" f a 7.20 1.0 23.04 11.2 40.99 15.4 f□=29.404 f4=14.654 16.4 6.2 2.0 f2=-7,96O f,=-528, 527 c d 5.24 4.67 4.45 5,46 8.42 1.49 f3=30.138 Example 2 f = g, go~49.98 =2.0~2.6 2ω=51. 546~8.86″ f, = 1.80 Sea A4 = A, = A, = 80. = 18th surface K = A4 = A, = A, = A1° = -4,49354X10-' 9.15906 x lo-"-5,38924x10-'1.23222xIO-" Aspheric coefficient Effective radius 6,0 -3.58728 x 10 -5.38150 X 10-' -1,59535X 10-7 -4.29237 x 10 -' 3.53996 7255 f2=-8,253 f,=-81,908 c d 8.5150 6.6236 7.3787 7.7599 11.9425 3.1961 f,=32.+86 Example 3 f=8.80~50 .00 F: 2.0~2.6 2ω=54.66°~9.40' fB==1.8O 19'' 11114.111 2.00 18] -50,791 1,50 1,51633 64, 1 Page 11 K = A, = AG = A, = 80. = 18th surface K = A, = AG = A, = A1゜ = Variable interval 8.80 27.01 50.00 Aspheric coefficient Effective radius -2,11982 -4,49777x 1O-s 9.14945 X 10- @ -5,38926X 10-9 1.23222 X 10-10 Aspherical coefficient Effective radius 1.33922 X 10 -4.18551 83427 x 10-11 5.0 5.0 1.0354 11.3604 15.8099 17.50 7.175 2.7255 7.2151 6.0712 10.6739 7.9296 9.0735 4.4708 f1=29 .982 f4=17.471 f2=-8,234 f,=-76,932 f,=32,662 14-30,549 Example 4 f=9.27~52.80 2ω=49.2″ ~8.4゜F: 1.44~1.98 fB=4.78 19th surface Aspheric coefficient Effective radius K = -7,58103X 10-' 21st surface Aspheric coefficient Effective radius = -1,69524 Variable interval 9.27 19.50 52.80 8.029 5.929 8.050 25.600 12.700 1.000 1.100 14.000 25.700 8.3 7.6 1.185 3.300 11.692 f1=48.09 f2=-12,51f3=3
9.58f4=20.94 f5=-1344,
01 Values in each example are as follows.

実施例1 実施例2 実施例3 実施例4f21h/ 
(fwZ)    0.318  0.330  0.
294  0.341f4/fw     2.04 
  1.95   1,99   2.26九Σ△1/
fw    O,00530,01580,00780
,0083v、−ν2.  2g、65  25.7 
  25.7   28.65n347   2.17
3  2.400  2.400  2.036(発明
の妨果) 本発明のズームレンズは、各実施例及びその収差図に見
るように、変倍比が6程度、Fナンバーが1.4〜2.
0程度と明るく高変倍比を有するにもかかわらず、コン
パクトで、諸収差がよく補正され、しかも変倍に伴う諸
収差の変動が極めて小さく、ビデオカメラ等に好適なも
のとなっている。
Example 1 Example 2 Example 3 Example 4f21h/
(fwZ) 0.318 0.330 0.
294 0.341f4/fw 2.04
1.95 1,99 2.269Σ△1/
fw O,00530,01580,00780
,0083v,-ν2. 2g, 65 25.7
25.7 28.65n347 2.17
3 2.400 2.400 2.036 (Influence of the invention) As shown in each example and its aberration diagram, the zoom lens of the present invention has a variable power ratio of about 6 and an F number of 1.4 to 2. ..
Although it is bright and has a high zoom ratio of about 0, it is compact, various aberrations are well corrected, and fluctuations in various aberrations due to zooming are extremely small, making it suitable for video cameras and the like.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明のズームレンズの基本構成を示す光学配
置図、第2.3.4.5図はそれぞれ本発明のズームレ
ンズの第1.2.3.4実施例の断面図、第6,7.8
.9図はそれぞれ上記第1.2.3.4実施例の収差曲
#i図である。
FIG. 1 is an optical layout diagram showing the basic configuration of the zoom lens of the present invention, and FIGS. 6,7.8
.. FIG. 9 is a diagram of aberration curve #i of the above-mentioned 1.2.3.4 embodiment.

Claims (1)

【特許請求の範囲】[Claims] 物体側から順に、正の屈折力を有し、変倍時に固定のま
まである第1レンズ成分、負の屈折力を有し、変倍の為
に前後に移動する第2レンズ成分、正の屈折力を有し変
倍時に固定のままである第3レンズ成分、正の屈折力を
有し、変倍に伴う焦点位置の移動を補正する第4レンズ
成分、および変倍時に固定のままである第5レンズ成分
から構成され、第5レンズ成分は、比較的弱い負の屈折
力を有することを特徴とするズームレンズ。
In order from the object side, the first lens component has a positive refractive power and remains fixed during zooming, the second lens component has a negative refractive power and moves back and forth for zooming, and the positive A third lens component has a refractive power and remains fixed when changing the magnification, a fourth lens component has a positive refractive power and corrects movement of the focal position due to changing the magnification, and a fourth lens component has a positive refractive power and remains fixed when changing the magnification. A zoom lens comprising a certain fifth lens component, the fifth lens component having a relatively weak negative refractive power.
JP2115843A 1990-04-27 1990-05-07 Compact zoom lens Expired - Lifetime JP2750775B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2115843A JP2750775B2 (en) 1990-05-07 1990-05-07 Compact zoom lens
US07/689,559 US5202992A (en) 1990-04-27 1991-04-23 Zoom lens apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2115843A JP2750775B2 (en) 1990-05-07 1990-05-07 Compact zoom lens

Publications (2)

Publication Number Publication Date
JPH0413109A true JPH0413109A (en) 1992-01-17
JP2750775B2 JP2750775B2 (en) 1998-05-13

Family

ID=14672505

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2115843A Expired - Lifetime JP2750775B2 (en) 1990-04-27 1990-05-07 Compact zoom lens

Country Status (1)

Country Link
JP (1) JP2750775B2 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5414562A (en) * 1992-03-19 1995-05-09 Konica Corporation Zoom lens
JPH0968653A (en) * 1995-08-30 1997-03-11 Olympus Optical Co Ltd Zoom lens
JPH09159917A (en) * 1995-12-12 1997-06-20 Copal Co Ltd Rear focus type zoom lens
JPH09269452A (en) * 1996-03-29 1997-10-14 Canon Inc Rear focus system zoom lens
EP1862836A1 (en) 2006-06-01 2007-12-05 Sony Corporation Telephoto type zoom lens having five groups of lenses
US7327953B2 (en) 2003-09-08 2008-02-05 Sony Corporation Zoom lens and imaging device
JP2008145529A (en) * 2006-12-06 2008-06-26 Sony Corp Zoom lens and imaging apparatus
CN110119023A (en) * 2019-06-16 2019-08-13 福建福光股份有限公司 6000000 high-resolution zoom camera lenses

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS647013A (en) * 1987-06-30 1989-01-11 Ricoh Kk Small-sized high variable power zoom lens
JPS6468709A (en) * 1987-09-09 1989-03-14 Nikon Corp Zoom lens

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS647013A (en) * 1987-06-30 1989-01-11 Ricoh Kk Small-sized high variable power zoom lens
JPS6468709A (en) * 1987-09-09 1989-03-14 Nikon Corp Zoom lens

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5414562A (en) * 1992-03-19 1995-05-09 Konica Corporation Zoom lens
JPH0968653A (en) * 1995-08-30 1997-03-11 Olympus Optical Co Ltd Zoom lens
US5966245A (en) * 1995-08-30 1999-10-12 Olympus Optical Co., Ltd. Zoom lens system
JPH09159917A (en) * 1995-12-12 1997-06-20 Copal Co Ltd Rear focus type zoom lens
JPH09269452A (en) * 1996-03-29 1997-10-14 Canon Inc Rear focus system zoom lens
US7327953B2 (en) 2003-09-08 2008-02-05 Sony Corporation Zoom lens and imaging device
EP1862836A1 (en) 2006-06-01 2007-12-05 Sony Corporation Telephoto type zoom lens having five groups of lenses
US7542212B2 (en) 2006-06-01 2009-06-02 Sony Corporation Zoom lens and image capture apparatus
JP2008145529A (en) * 2006-12-06 2008-06-26 Sony Corp Zoom lens and imaging apparatus
US7505212B2 (en) 2006-12-06 2009-03-17 Sony Corporation Zoom lens and image pick-up apparatus
CN110119023A (en) * 2019-06-16 2019-08-13 福建福光股份有限公司 6000000 high-resolution zoom camera lenses

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