JP2988031B2 - Compact zoom lens - Google Patents
Compact zoom lensInfo
- Publication number
- JP2988031B2 JP2988031B2 JP3202395A JP20239591A JP2988031B2 JP 2988031 B2 JP2988031 B2 JP 2988031B2 JP 3202395 A JP3202395 A JP 3202395A JP 20239591 A JP20239591 A JP 20239591A JP 2988031 B2 JP2988031 B2 JP 2988031B2
- Authority
- JP
- Japan
- Prior art keywords
- lens
- object side
- group
- refractive power
- optical axis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/177—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
- G02B15/1435—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative
- G02B15/143503—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative arranged -+-
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
- G02B15/1435—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative
- G02B15/143507—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative arranged -++
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Lenses (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明はコンパクトなズームレン
ズに関し、特に負の屈折力のレンズ群が先行し、全体と
して3つのレンズ群を有し、このうち物体側の2つのレ
ンズ群を移動させることにより変倍を行った小型でしか
も高変倍のスチールカメラ、ビデオカメラ等に好適なコ
ンパクトな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, and more particularly to a lens group having a negative refractive power, which has three lens groups as a whole, of which two lens groups on the object side are moved. The present invention relates to a compact zoom lens suitable for use in a small and high-magnification still camera, video camera, or the like, which performs magnification.
【0002】[0002]
【従来の技術】従来よりレンズ全長の短縮化及びレンズ
外径の縮少化を図ったズームレンズが例えば特開昭59
−16248号公報、特開昭62−87925号公報等
で提案されている。2. Description of the Related Art Conventionally, a zoom lens in which the total length of the lens is reduced and the outer diameter of the lens is reduced is disclosed in, for example, Japanese Patent Application Laid-Open No. 59-1984.
No. 16248 and Japanese Patent Laid-Open No. 62-87925.
【0003】特開昭59−16248号公報では負の屈
折力の第1群と正の屈折力の第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った所謂ショー
トズームレンズを提案している。In Japanese Patent Application Laid-Open No. 59-16248, there are provided two lens units, a first unit having a negative refractive power and a second unit having a positive refractive power, and the magnification is changed by changing the distance between the two lens units. A so-called short zoom lens has been proposed.
【0004】一方、特開昭62−87925号公報は本
出願人の先の出願に係るものであり、同公報では物体側
より順に負の屈折力の第1群と正の屈折力の第2群、そ
して第3群の3つのレンズ群を有し、第1群と第2群を
移動させて変倍を行うと共に第1群に非球面を設けるこ
とにより高変倍でしかも変倍の際の収差変動を良好に補
正したズームレンズを提案している。On the other hand, Japanese Patent Application Laid-Open No. 62-87925 is based on the earlier application of the present applicant, and in this publication, a first group of negative refractive power and a second group of positive refractive power are sequentially arranged from the object side. The zoom lens has three lens groups, a first lens group and a third lens group. The first lens group and the second lens group are moved to perform zooming, and the first lens group is provided with an aspherical surface. Has proposed a zoom lens that satisfactorily corrects aberration fluctuations.
【0005】[0005]
【発明が解決しようとする課題】一般に標準画角を有す
るズームレンズにおいて変倍比の高倍率化を図れば焦点
距離範囲(撮影画角範囲)が拡がる。この結果、レンズ
変換なしで種々な条件で撮影することができて好まし
い。Generally, in a zoom lens having a standard angle of view, if the magnification ratio is increased, the range of the focal length (the range of the angle of view) is increased. As a result, photographing can be performed under various conditions without lens conversion, which is preferable.
【0006】しかしながら、変倍比の高倍率化を図ると
レンズ系全体が大型化し、又変倍に伴う収差変動が増大
し、光学性能を良好に維持するのが難しくなってくる。However, if the magnification ratio is increased, the entire lens system becomes large, and the variation in aberrations accompanying the magnification increases, making it difficult to maintain good optical performance.
【0007】本発明は本出願人の先の特開昭62−87
925号公報で提案したズームレンズの屈折力配置を利
用し、各レンズ群のレンズ構成を更に改良し、特に高倍
率化及びレンズ全長の短縮化を図ると共に全変倍範囲に
わたり高い光学性能を有したコンパクトなズームレンズ
の提供を目的とする。[0007] The present invention relates to Japanese Patent Application Laid-Open No. 62-87 of the present applicant.
Utilizing the refractive power arrangement of the zoom lens proposed in Japanese Patent Publication No. 925, the lens configuration of each lens group is further improved, and in particular, high magnification and shortening of the entire length of the lens are achieved, and high optical performance is provided over the entire zoom range. The objective is to provide a compact zoom lens.
【0008】[0008]
【課題を解決するための手段】本発明のコンパクトなズ
ームレンズは、物体側より順に変倍に伴う像面変動を補
正する為に光軸上移動する負の屈折力の第1群と変倍の
為光軸上移動する正の屈折力の第2群、そして変倍の際
固定の第3群の3つのレンズ群を有するズームレンズで
あって、該第1群は物体側より順に物体側に凸面を向け
たメニスカス状の負の第11レンズ、物体側に比べ像面
側に強い屈折面を向けた両レンズ面が凹面の第12レン
ズ、そして物体側に凸面を向けたメニスカス状の正の第
13レンズの3つのレンズを有しており、該第i群の焦
点距離をfi、望遠端における全系の焦点距離をfTと
するとき 0.4<f2/fT<0.5 ・・・・・・(1) 0.5<|f1|/fT<0.6 ・・・・・・(2) なる条件を満足することを特徴としている。SUMMARY OF THE INVENTION A compact zoom lens according to the present invention comprises a first lens unit having a negative refractive power which moves on the optical axis in order from the object side to correct an image plane variation caused by zooming. A second lens unit having a positive refractive power that moves on the optical axis for zooming, and a third lens unit that is fixed during zooming, the first lens unit being arranged in order from the object side to the object side. A meniscus negative eleventh lens having a convex surface facing the lens surface, a twelfth lens having a concave refractive surface facing the image side compared with the object side, and a meniscus positive lens having a convex surface facing the object side. When the focal length of the i-th lens unit is fi and the focal length of the entire system at the telephoto end is fT, 0.4 <f2 / fT <0.5... ... (1) 0.5 <| f1 | / fT <0.6 (2) It is characterized in that.
【0009】[0009]
【実施例】図1〜図4は本発明の後述する数値実施例1
〜4のレンズ断面図である。1 to 4 show a first embodiment of the present invention, which will be described later.
It is a lens cross-sectional view of No.-4.
【0010】図5〜図7は本発明の数値実施例1の広角
端、中間、望遠端の収差図、図8〜図10は本発明の数
値実施例2の広角端、中間、望遠端の収差図、図11〜
図13は本発明の数値実施例3の広角端、中間、望遠端
の収差図、図14〜図16は本発明の数値実施例4の広
角端、中間、望遠端の収差図である。レンズ断面図にお
いて(A)は広角端、(B)は望遠端を示している。FIGS. 5 to 7 are aberration diagrams at the wide-angle end, middle, and telephoto end of Numerical Embodiment 1 of the present invention, and FIGS. 8 to 10 are at the wide-angle end, middle, and telephoto end of Numerical Embodiment 2 of the present invention. Aberration diagrams, FIGS.
FIG. 13 is an aberration diagram at a wide angle end, a middle position, and a telephoto end in Numerical Example 3 of the present invention, and FIGS. 14 to 16 are aberration diagrams at a wide angle end, a middle position, and a telephoto end of Numerical Example 4 of the present invention. In the lens cross-sectional view, (A) shows the wide-angle end, and (B) shows the telephoto end.
【0011】図中L1は負の屈折力の第1群、L2は正
の屈折力の第2群、L3は変倍中固定の第3群、Pは口
径が一定のフレアー絞り、SPは開口絞り、FPは像面
である。In the figure, L1 is a first lens unit having a negative refractive power, L2 is a second lens unit having a positive refractive power, L3 is a third lens unit fixed during zooming, P is a flare stop having a constant aperture, and SP is an aperture. The diaphragm and FP are image planes.
【0012】本実施例では広角端から望遠端への変倍に
際し、矢印で示すように第2群を物体側へ移動させて変
倍を行い、変倍に伴う像面変動を第1群をそれに対応さ
せて往復移動させて補正している。In this embodiment, upon zooming from the wide-angle end to the telephoto end, the second lens unit is moved to the object side as shown by the arrow to perform zooming, and the image plane fluctuation accompanying the zooming is reduced by the first lens unit. Corresponding to this, it is corrected by reciprocating movement.
【0013】又、フレアー絞りPを第2群と第3群との
間に配置し、変倍と共に矢印の如く物体側へ移動させ
て、主に中間画角(中間から望遠端への変倍範囲)にお
けるメリディオナル光線によるフレアー成分を除去し、
これにより第2群の屈折力を強めている。Further, the flare stop P is disposed between the second and third units, and is moved toward the object side as indicated by an arrow together with the magnification, so that the image is mainly focused on the intermediate angle of view (magnification from the middle to the telephoto end). The flare component due to the meridional rays in the
Thereby, the refractive power of the second lens unit is increased.
【0014】本発明のズームレンズは図1〜図4に示す
ように物体側より順に負の屈折力の第1群、正の屈折力
の第2群、そして正又は負の屈折力の第3群の3つのレ
ンズ群より構成し、変倍に際して第1群と第2群を前述
の如く移動させると共に第1群と第2群の屈折力を条件
式(1)、(2)の如く設定している。これによりレン
ズ全長の短縮化を図りつつ、広画角(74°)から望遠
(31°)へと標準画角を含んだ変倍比3程度の高変倍
比の全変倍範囲にわたり良好なる光学性能を有したコン
パクトなズームレンズを得ている。又、前記第1群を物
体側より順に物体側に凸面を向けたメニスカス状の負の
第11レンズ、物体側に比べ像面側に強い屈折面を向け
た両レンズ面が凹面の第12レンズ、そして物体側に凸
面を向けたメニスカス状の正の第13レンズの3つのレ
ンズより構成することにより第1群全体のレンズ厚を薄
くし、かつ第1群を負レンズ、負レンズ、そして正レン
ズとして主点位置を適切に設定しレンズ全長の短縮化を
容易にしている。又、第1群でフォーカスするときの収
差変動を少なくしている。As shown in FIGS. 1 to 4, the zoom lens according to the present invention comprises, in order from the object side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a third lens unit having a positive or negative refractive power. The first lens unit and the second lens unit are moved as described above during zooming, and the refractive powers of the first lens unit and the second lens unit are set as in conditional expressions (1) and (2). doing. As a result, while shortening the overall length of the lens, the zoom lens is improved over the entire zoom range of a high zoom ratio of about 3 including the standard angle of view from a wide angle of view (74 °) to a telephoto angle (31 °). A compact zoom lens with optical performance has been obtained. A negative meniscus eleventh lens having the first lens unit having a convex surface facing the object side in order from the object side, and a twelfth lens having both concave lens surfaces having a stronger refracting surface facing the image surface side than the object side. And the three lenses of a positive meniscus thirteenth lens having a convex surface facing the object side to reduce the lens thickness of the entire first group, and to make the first group a negative lens, a negative lens, and a positive lens. The position of the principal point of the lens is appropriately set to facilitate shortening of the entire length of the lens. In addition, aberration fluctuation when focusing with the first lens unit is reduced.
【0015】条件式(1)は第2群の正の屈折力に関
し、従来のズームレンズに比べて強い屈折力を与えて主
にレンズ全長の短縮化を図りつつ所定の変倍比を確保す
る為のものである。Conditional expression (1) relates to the positive refracting power of the second lens unit, and provides a higher refracting power than the conventional zoom lens to secure a predetermined zoom ratio while mainly shortening the overall length of the lens. It is for.
【0016】条件式(1)の上限値を越えて第2群の正
の屈折力が弱くなりすぎると、所定の変倍比を確保する
為に第2群の移動量を増加させねばならずレンズ全長が
増大してくる。又下限値を越えて第2群の正の屈折力が
強くなりすぎると、レンズ全長は短くなるが変倍に伴う
収差変動が大きくなり、全変倍範囲にわたり光学性能を
良好に維持するのが難しくなってくる。If the positive refractive power of the second lens unit becomes too weak beyond the upper limit of conditional expression (1), the amount of movement of the second lens unit must be increased in order to secure a predetermined zoom ratio. The overall length of the lens increases. If the positive refractive power of the second lens unit becomes too strong beyond the lower limit, the overall length of the lens becomes short, but the aberration variation accompanying zooming increases, and it is necessary to maintain good optical performance over the entire zooming range. It becomes difficult.
【0017】条件式(2)は第1群の負の屈折力に関
し、条件式(1)と共にレンズ全長の短縮化を図りつつ
主に変倍に伴う収差変動を良好に補正する為のものであ
る。Conditional expression (2) relates to the negative refracting power of the first lens unit and, in conjunction with conditional expression (1), favorably corrects the aberration fluctuation mainly due to zooming while shortening the total lens length. is there.
【0018】条件式(2)の上限値を越えて第1群の負
の屈折力が弱くなりすぎると変倍に伴う移動量が増加
し、レンズ全長が長くなると共に軸外光束を所定量確保
する為にレンズ径を増大させねばならなくレンズ系全体
が大型化してくる。又下限値を越えて第1群の負の屈折
力が強くなりすぎると、変倍に伴う移動量は少なくなる
が変倍に伴う収差変動を良好に補正するのが難しくなっ
てくる。If the negative refractive power of the first lens unit becomes too weak beyond the upper limit of conditional expression (2), the amount of movement accompanying zooming increases, the overall length of the lens increases, and a predetermined amount of off-axis light flux is secured. In order to achieve this, the lens diameter must be increased and the entire lens system becomes larger. If the negative refractive power of the first lens unit becomes too strong beyond the lower limit, the amount of movement accompanying zooming is reduced, but it becomes difficult to satisfactorily correct aberration fluctuations caused by zooming.
【0019】本発明のコンパクトなズームレンズは以上
の諸条件を満足させることにより達成することができる
が、更にレンズ系全体の小型化を図りつつ全変倍範囲に
わたり良好なる光学性能を得る為には次の如く各要素を
構成するのが良い。The compact zoom lens of the present invention can be achieved by satisfying the above-mentioned conditions. However, in order to obtain good optical performance over the entire zoom range while further reducing the size of the entire lens system. It is good to constitute each element as follows.
【0020】[0020]
【0021】(イ)前記第2群は物体側より順に少なく
とも2枚の正レンズ、物体側に比べ像面側に強い屈折面
を向けた負レンズ、両レンズ面が凸面の正レンズより構
成すること。このように物体側に少なくとも2つの正レ
ンズを配置し、負の屈折力の第1群からの発散光束を順
次収束させ、第2群の屈折力を条件式(1)に示すよう
に強くし、レンズ全長の短縮化を図ったときの球面収差
の発生を少なくしている。(A) The second unit is composed of at least two positive lenses in order from the object side, a negative lens having a refracting surface stronger on the image surface side than the object side, and a positive lens having both lens surfaces convex. thing. In this way, at least two positive lenses are arranged on the object side, the divergent light beams from the first group having a negative refractive power are sequentially converged, and the refractive power of the second group is increased as shown in conditional expression (1). In addition, the occurrence of spherical aberration when the total length of the lens is reduced is reduced.
【0022】(ロ)前記第2群と第3群との間の光路中
に変倍に伴い第2群の移動量より少ない光軸上移動する
口径が一定のフレアー絞りを設けること。これにより第
2群の屈折力を条件式(1)に示すように強くし、レン
ズ全長の短縮化を図ったときの中間から望遠端にかけて
発生するコマフレアーを除去し、光学性能の低下を防止
している。(B) In the optical path between the second and third units, there is provided a flare stop having a constant diameter and moving on the optical axis smaller than the amount of movement of the second unit as the magnification changes. As a result, the refractive power of the second lens unit is increased as shown by the conditional expression (1), and the coma flare that occurs from the middle to the telephoto end when the total length of the lens is reduced is eliminated, thereby preventing a decrease in optical performance. doing.
【0023】(ハ)前記第11レンズの物体側のレンズ
面は光軸から離れるに従い負の屈折力が弱くなる形状の
非球面より構成すること、又は/及び前記第12レンズ
の像面側のレンズ面は光軸から離れるに従い負の屈折力
が弱くなる形状の非球面より構成すること。これにより
主に広角側で発生する歪曲収差と共にコマ収差を良好に
補正している。(C) The object-side lens surface of the eleventh lens is formed of an aspheric surface having a shape in which negative refractive power becomes weaker as the distance from the optical axis increases, and / or the image surface of the twelfth lens on the image surface side. The lens surface should be composed of an aspheric surface whose negative refractive power becomes weaker as the distance from the optical axis increases. Thereby, coma as well as distortion occurring mainly on the wide-angle side is favorably corrected.
【0024】(ニ)前記第11レンズの物体側のレンズ
面の曲率半径をR1としたとき 0.4<R1/fT<0.7 ・・・・・・・(3) なる条件を満足すること。(D) Assuming that the radius of curvature of the object-side lens surface of the eleventh lens is R1, the following condition is satisfied: 0.4 <R1 / fT <0.7 (3) thing.
【0025】条件式(3)は第1群でフォーカスする際
の収差変動を少なくしつつ近接撮影を良好に行う為のも
のである。Conditional expression (3) is for performing close-up photography satisfactorily while reducing aberration fluctuation when focusing with the first lens unit.
【0026】条件式(3)の上限値を越えてレンズ面の
屈折力が弱くなりすぎると近接撮影が難しくなる。又下
限値を越えて屈折力が強くなりすぎると、フォーカスの
際の収差変動が大きくなってくるので良くない。If the refractive power of the lens surface becomes too weak beyond the upper limit of conditional expression (3), close-up photographing becomes difficult. On the other hand, if the refractive power exceeds the lower limit and the refractive power becomes too strong, the fluctuation of aberration during focusing increases, which is not good.
【0027】次に本発明の数値実施例を示す。数値実施
例においてriは物体側より順に第i番目のレンズ面の
曲率半径、di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。Next, numerical examples of the present invention will be described. In the numerical examples, ri is the radius of curvature of the i-th lens surface in order from the object side, di is the i-th lens thickness and air space from the object side, and ni and νi are the i-th lens surfaces in order from the object side. The refractive index and Abbe number of glass.
【0028】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 なる式で表わしている。The aspheric surface has an X-axis in the optical axis direction, an H-axis in a direction perpendicular to the optical axis, a positive traveling direction of light, R is a paraxial radius of curvature,
When A, B, C, D, and E are aspherical coefficients, respectively It is represented by the following equation.
【0029】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。 数値実施例 1 F=28.9 〜77.4 FNO=1:3.5 〜5.6 2ω=73.6 °〜31.2° r 1= 42.75 d 1= 1.68 n 1=1.83400 ν 1= 37.2 r 2= 19.36 d 2= 9.11 r 3= -180.06 d 3= 1.49 n 2=1.71300 ν 2= 53.8 r 4= 50.92 d 4= 2.02 r 5= 35.76 d 5= 4.11 n 3=1.80518 ν 3= 25.4 r 6= 144.19 d 6= 可変 r 7= 36.90 d 7= 2.00 n 4=1.60311 ν 4= 60.7 r 8= -1565.08 d 8= 1.88 d 8= 0.69 r 9= 26.76 d 9= 3.94 n 5=1.56384 ν 5= 60.7 r10= 100.55 d10= 0.15 r11= 20.66 d11= 2.84 n 6=1.56384 ν 6= 60.7 r12= 53.57 d12= 0.56 r13= 526.49 d13= 5.65 n 7=1.76182 ν 7= 26.5 r14= 14.81 d14= 1.67 r15= 109.31 d15= 2.05 n 8=1.63980 ν 8= 34.5 r16= -46.29 d16= 可変 移動絞り d17= 可変 r17= -47.36 d18= 1.29 n 9=1.80610 ν 9= 41.0 r18= 201.65 d19= 3.80 n10=1.58144 ν 9= 40.8 r19= -35.01 Table 1 shows the relationship between the above-mentioned conditional expressions and various numerical values in the numerical examples. Numerical example 1 F = 28.9 to 77.4 FNO = 1: 3.5 to 5.6 2ω = 73.6 ° to 31.2 ° r 1 = 42.75 d 1 = 1.68 n 1 = 1.83400 ν 1 = 37.2 r 2 = 19.36 d 2 = 9.11 r 3 = -180.06 d 3 = 1.49 n 2 = 1.71300 ν 2 = 53.8 r 4 = 50.92 d 4 = 2.02 r 5 = 35.76 d 5 = 4.11 n 3 = 1.80518 ν 3 = 25.4 r 6 = 144.19 d 6 = Variable r 7 = 36.90 d 7 = 2.00 n 4 = 1.60311 ν 4 = 60.7 r 8 = -1565.08 d 8 = 1.88 d 8 = 0.69 r 9 = 26.76 d 9 = 3.94 n 5 = 1.56384 ν 5 = 60.7 r10 = 100.55 d10 = 0.15 r11 = 20.66 d11 = 2.84 n 6 = 1.56384 ν 6 = 60.7 r12 = 53.57 d12 = 0.56 r13 = 526.49 d13 = 5.65 n 7 = 1.76182 ν 7 = 26.5 r14 = 14.81 d14 = 1.67 r15 = 109.31 d15 = 2.05 n 8 = 1.63980 ν 8 = 34.5 r16 = -46.29 d16 = Variable moving aperture d17 = Variable r17 = -47.36 d18 = 1.29 n 9 = 1.80610 ν 9 = 41.0 r18 = 201.65 d19 = 3.80 n10 = 1.58144 ν 9 = 40.8 r19 = -35.01
【0030】[0030]
【表1】 r4面が非球面 A=0 B=−1.5014×10-6 C=−3.8535×10-9 D=−9.8386×10-13 E=−2.8625×10-14 数値実施例 2 F=28.9 〜77.6 FNO=1:3.5 〜5.6 2ω=73.6 °〜31.2° r 1= 46.22 d 1= 1.68 n 1=1.83400 ν 1= 37.2 r 2= 19.62 d 2= 9.78 r 3= -161.45 d 3= 1.49 n 2=1.71300 ν 2= 53.8 r 4= 56.82 d 4= 1.65 r 5= 37.45 d 5= 4.11 n 3=1.80518 ν 3= 25.4 r 6= 174.76 d 6= 可変 r 7= 38.39 d 7= 2.80 n 4=1.60311 ν 4= 60.7 r 8=-12254.20 d 8= 0.15 r 9= 27.75 d 9= 2.42 n 5=1.56384 ν 5= 60.7 r10= 91.96 d10= 1.80 絞り d11= 0.80 r11= 20.57 d12= 3.43 n 6=1.56384 ν 6= 60.7 r12= 47.63 d13= 0.66 r13= 256.76 d14= 5.63 n 7=1.80518 ν 7= 25.4 r14= 15.09 d15= 1.41 r15= 53.90 d16= 1.86 n 8=1.63980 ν 8= 34.5 r16= -55.10 d17= 可変 移動絞り d18= 可変 r17= -44.65 d19= 1.29 n 9=1.80610 ν 9= 41.0 r18= 321.37 d20= 3.69 n10=1.58144 ν10= 40.8 r19= -34.27 [Table 1] r4 surface is aspherical surface A = 0 B = −1.5014 × 10 −6 C = −3.8535 × 10 −9 D = −9.8386 × 10 −13 E = −2.8625 × 10 −14 Numerical implementation Example 2 F = 28.9 to 77.6 FNO = 1: 3.5 to 5.6 2ω = 73.6 ° to 31.2 ° r 1 = 46.22 d 1 = 1.68 n 1 = 1.83400 ν 1 = 37.2 r 2 = 19.62 d 2 = 9.78 r 3 = -161.45 d 3 = 1.49 n 2 = 1.71300 ν 2 = 53.8 r 4 = 56.82 d 4 = 1.65 r 5 = 37.45 d 5 = 4.11 n 3 = 1.80518 ν 3 = 25.4 r 6 = 174.76 d 6 = Variable r 7 = 38.39 d 7 = 2.80 n 4 = 1.60311 ν 4 = 60.7 r 8 = -12254.20 d 8 = 0.15 r 9 = 27.75 d 9 = 2.42 n 5 = 1.56384 ν 5 = 60.7 r10 = 91.96 d10 = 1.80 Aperture d11 = 0.80 r11 = 20.57 d12 = 3.43 n 6 = 1.56384 ν 6 = 60.7 r12 = 47.63 d13 = 0.66 r13 = 256.76 d14 = 5.63 n 7 = 1.80518 ν 7 = 25.4 r14 = 15.09 d15 = 1.41 r15 = 53.90 d16 = 1.86 n 8 = 1.63980 ν 8 = 34.5 r16 = -55.10 d17 = Variable moving aperture d18 = Variable r17 = -44.65 d19 = 1.29 n 9 = 1.80610 ν 9 = 41.0 r18 = 321.37 d20 = 3.69 n10 = 1.58144 ν10 = 40.8 r19 = -34.27
【0031】[0031]
【表2】 r4面が非球面 A=0 B=−1.5297×10-6 C=−4.6051×10-9 D=−9.8403×10-13 E=−2.862×10-14 数値実施例 3 F=28.9 〜77.4 FNO=1:3.5 〜5.6 2ω=73.6 °〜31.2° r 1= 37.84 d 1= 1.80 n 1=1.83400 ν 1= 37.2 r 2= 19.21 d 2= 9.22 r 3= -253.03 d 3= 1.50 n 2=1.69680 ν 2= 55.5 r 4= 46.00 d 4= 0.03 n 3=1.56700 ν 3= 42.8 r 5= 44.68 d 5= 2.85 r 6= 34.52 d 6= 4.00 n 4=1.80518 ν 4= 25.4 r 7= 97.19 d 7= 可変 r 8= 38.05 d 8= 2.50 n 5=1.60311 ν 5= 60.7 r 9= -220.56 d 9= 1.80 絞り r10= 22.76 d10= 2.81 n 6=1.58913 ν 6= 61.2 r11= 96.09 d11= 0.15 r12= 25.75 d12= 3.55 n 7=1.54072 ν 7= 47.2 r13= 39.54 d13= 1.00 r14= -272.00 d14= 5.34 n 8=1.80518 ν 8= 25.4 r15= 16.49 d15= 1.39 r16= 87.52 d16= 2.16 n 9=1.63980 ν 9= 34.5 r17= -36.67 d17= 可変 移動絞り d18= 可変 r18= -44.35 d19= 1.20 n10=1.80610 ν 9= 41.0 r19= 807.44 d20= 4.08 n11=1.58144 ν10= 40.8 r20= -34.32 [Table 2] r4 surface is aspherical surface A = 0 B = −1.5297 × 10 −6 C = −4.6051 × 10 −9 D = −9.8403 × 10 −13 E = −2.862 × 10 −14 Numerical implementation Example 3 F = 28.9 to 77.4 FNO = 1: 3.5 to 5.6 2ω = 73.6 ° to 31.2 ° r 1 = 37.84 d 1 = 1.80 n 1 = 1.83400 ν 1 = 37.2 r 2 = 19.21 d 2 = 9.22 r 3 = -253.03 d 3 = 1.50 n 2 = 1.69680 ν 2 = 55.5 r 4 = 46.00 d 4 = 0.03 n 3 = 1.56700 ν 3 = 42.8 r 5 = 44.68 d 5 = 2.85 r 6 = 34.52 d 6 = 4.00 n 4 = 1.80518 ν 4 = 25.4 r 7 = 97.19 d 7 = Variable r 8 = 38.05 d 8 = 2.50 n 5 = 1.60311 ν 5 = 60.7 r 9 = -220.56 d 9 = 1.80 Aperture r10 = 22.76 d10 = 2.81 n 6 = 1.58913 ν 6 = 61.2 r11 = 96.09 d11 = 0.15 r12 = 25.75 d12 = 3.55 n 7 = 1.54072 ν 7 = 47.2 r13 = 39.54 d13 = 1.00 r14 = -272.00 d14 = 5.34 n 8 = 1.80518 ν 8 = 25.4 r15 = 16.49 d15 = 1.39 r16 = 87.52 d16 = 2.16 n 9 = 1.63980 ν 9 = 34.5 r17 = -36.67 d17 = Variable moving aperture d18 = Variable r18 = -44.35 d19 = 1.20 n10 = 1.80610 ν 9 = 41.0 r19 = 807.44 d20 = 4.08 n11 = 1.58144 ν10 = 40.8 r20 = -34.32
【0032】[0032]
【表3】 r5面が非球面 A=0 B=−1.7071×10-6 C=−5.3019×10-9 D=−9.842×10-13 E=−2.8626×10-14 数値実施例 4 F=28.9 〜77.4 FNO=1:3.5 〜5.6 2ω=73.6 °〜31.2° r 1= 49.67 d 1= 1.80 n 1=1.83400 ν 1= 37.2 r 2= 22.00 d 2= 0.03 n 2=1.56700 ν 2= 42.8 r 3= 19.16 d 3= 8.82 r 4= -242.62 d 4= 1.50 n 3=1.71300 ν 3= 53.8 r 5= 54.57 d 5= 2.01 r 6= 34.38 d 6= 4.00 n 4=1.80518 ν 4= 25.4 r 7= 112.68 d 7= 可変 r 8= 37.88 d 8= 2.50 n 5=1.60311 ν 5= 60.7 r 9= -229.03 d 9= 1.80 絞り r10= 23.78 d10= 4.02 n 6=1.60311 ν 6= 60.7 r11= 88.96 d11= 0.15 r12= 22.41 d12= 2.08 n 7=1.54072 ν 7= 47.2 r13= 40.59 d13= 1.00 r14= -1088.03 d14= 5.67 n 8=1.80518 ν 8= 25.4 r15= 15.96 d15= 1.56 r16= 142.75 d16= 1.88 n 9=1.63980 ν 9= 34.5 r17= -36.73 d17= 可変 移動絞り d18= 可変 r18= -48.91 d19= 1.20 n10=1.80610 ν10= 41.0 r19= 200.35 d20= 4.00 n11=1.58144 ν11= 40.8 r20= -36.10 [Table 3] r5 surface is aspherical surface A = 0 B = −1.7071 × 10 −6 C = −5.30119 × 10 −9 D = −9.842 × 10 −13 E = −2.8626 × 10 −14 Numerical implementation Example 4 F = 28.9 to 77.4 FNO = 1: 3.5 to 5.6 2ω = 73.6 ° to 31.2 ° r 1 = 49.67 d 1 = 1.80 n 1 = 1.83400 ν 1 = 37.2 r 2 = 22.00 d 2 = 0.03 n 2 = 1.56700 ν 2 = 42.8 r 3 = 19.16 d 3 = 8.82 r 4 = -242.62 d 4 = 1.50 n 3 = 1.71300 ν 3 = 53.8 r 5 = 54.57 d 5 = 2.01 r 6 = 34.38 d 6 = 4.00 n 4 = 1.80518 ν 4 = 25.4 r 7 = 112.68 d 7 = Variable r 8 = 37.88 d 8 = 2.50 n 5 = 1.60311 ν 5 = 60.7 r 9 = -229.03 d 9 = 1.80 Aperture r10 = 23.78 d10 = 4.02 n 6 = 1.60311 ν 6 = 60.7 r11 = 88.96 d11 = 0.15 r12 = 22.41 d12 = 2.08 n 7 = 1.54072 ν 7 = 47.2 r13 = 40.59 d13 = 1.00 r14 = -1088.03 d14 = 5.67 n 8 = 1.80518 ν 8 = 25.4 r15 = 15.96 d15 = 1.56 r16 = 142.75 d16 = 1.88 n 9 = 1.63980 ν 9 = 34.5 r17 = -36.73 d17 = Variable moving aperture d18 = Variable r18 = -48.91 d19 = 1.20 n10 = 1.80610 ν10 = 41.0 r19 = 200.35 d20 = 4.00 n11 = 1.58144 ν11 = 40.8 r20 = -36.10
【0033】[0033]
【表4】 r3面が非球面 A=0 B=−1.1358×10-6 C=−1.6066×10-8 D= 7.9395×10-11 E=−3.3834×10-13 (表−1)[Table 4] r3 surface is aspherical surface A = 0 B = -1.1358 × 10 −6 C = −1.6066 × 10 −8 D = 7.9395 × 10 −11 E = −3.3834 × 10 −13 (Table- 1)
【0034】[0034]
【表5】 [Table 5]
【0035】[0035]
【発明の効果】本発明によれば前述の如く3つのレンズ
群の屈折力やレンズ構成を特定することにより、レンズ
全系の小型化を図った変倍比3程度の全変倍範囲にわた
り良好なる光学性能を有したコンパクトなズームレンズ
を達成することができる。According to the present invention, the refractive power and the lens configuration of the three lens groups are specified as described above, so that the entire lens system can be miniaturized and the entire zoom range of about 3 can be achieved. A compact zoom lens having excellent optical performance can be achieved.
【図面の簡単な説明】[Brief description of the drawings]
【図1】本発明の数値実施例1のレンズ断面図FIG. 1 is a sectional view of a lens according to a 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 sectional view of a lens according to a 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 sectional view of a lens according to a 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 sectional view of a lens according to a 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 a wide-angle end according to Numerical Embodiment 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 the 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 in 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 the 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 in 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 the 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 in 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 a 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 the 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 in Numerical Example 4 of the present invention.
L1 第1群 L2 第2群 L3 第3群 SP 開口絞り P フレアー絞り FP 像面 L1 First lens group L2 Second lens group L3 Third lens group SP Aperture stop P Flare stop FP Image plane
フロントページの続き (56)参考文献 特開 昭62−124516(JP,A) 特開 昭62−24211(JP,A) 特開 昭61−240217(JP,A) 特開 昭60−6914(JP,A) 特開 昭59−31923(JP,A) 特開 昭59−18917(JP,A) 特開 昭58−178316(JP,A) 特開 昭58−132207(JP,A) 特開 昭58−111013(JP,A) 特開 昭58−100115(JP,A) 特開 平4−163512(JP,A) 特開 昭62−112115(JP,A) 特開 昭61−286812(JP,A) (58)調査した分野(Int.Cl.6,DB名) G02B 9/00 - 17/08 G02B 21/02 - 21/04 G02B 25/00 - 25/04 Continuation of the front page (56) References JP-A-62-124516 (JP, A) JP-A-62-24211 (JP, A) JP-A-61-240217 (JP, A) JP-A-60-6914 (JP, A) JP-A-59-31923 (JP, A) JP-A-59-18917 (JP, A) JP-A-58-178316 (JP, A) JP-A-58-132207 (JP, A) 58-111013 (JP, A) JP-A-58-100115 (JP, A) JP-A-4-163512 (JP, A) JP-A-62-112115 (JP, A) JP-A-61-286812 (JP, A) A) (58) Field surveyed (Int. Cl. 6 , DB name) G02B 9/00-17/08 G02B 21/02-21/04 G02B 25/00-25/04
Claims (6)
正する為に光軸上移動する負の屈折力の第1群と変倍の
為光軸上移動する正の屈折力の第2群、そして変倍の際
固定の第3群の3つのレンズ群を有するズームレンズで
あって、該第1群は物体側より順に物体側に凸面を向け
たメニスカス状の負の第11レンズ、物体側に比べ像面
側に強い屈折面を向けた両レンズ面が凹面の第12レン
ズ、そして物体側に凸面を向けたメニスカス状の正の第
13レンズの3つのレンズを有しており、該第i群の焦
点距離をfi、望遠端における全系の焦点距離をfTと
するとき 0.4<f2/fT<0.5 0.5<|f1|/fT<0.6 なる条件を満足することを特徴とするコンパクトなズー
ムレンズ。1. A first group of negative refractive power moving on the optical axis for correcting an image plane variation accompanying magnification in order from the object side, and a first group of positive refractive power moving on the optical axis for magnification. A zoom lens with three lens groups, two groups and a third group fixed during zooming
The first lens group has a convex surface facing the object side in order from the object side.
Negative meniscus eleventh lens, image plane compared to object side
12th lens with concave surfaces facing both lens surfaces
And a positive meniscus shape with the convex surface facing the object side.
When the focal length of the i-th lens unit is fi and the focal length of the entire system at the telephoto end is fT, 0.4 <f2 / fT <0.5 0.5 < | F1 | / fT <0.6 A compact zoom lens characterized by satisfying the following condition:
2枚の正レンズ、物体側に比べ像面側に強い屈折面を向
けた負レンズ、両レンズ面が凸面の正レンズを有してい
ることを特徴とする請求項1のコンパクトなズームレン
ズ。2. The second group includes at least two positive lenses in order from the object side, a negative lens having a refracting surface stronger on the image surface side than the object side, and a positive lens having both lens surfaces convex. 2. The compact zoom lens according to claim 1, wherein
倍に伴い光軸上移動する口径が一定のフレアー絞りを設
けたことを特徴とする請求項1のコンパクトなズームレ
ンズ。3. A compact zoom according to claim 1, further comprising a flare stop having a constant aperture which moves on the optical axis with zooming in an optical path between said second group and said third group. lens.
光軸から離れるに従い負の屈折力が弱くなる形状の非球
面より成っていることを特徴とする請求項1のコンパク
トなズームレンズ。4. The compact zoom lens according to claim 1, wherein the object-side lens surface of the eleventh lens is formed of an aspheric surface having a negative refractive power that decreases as the distance from the optical axis increases.
光軸から離れるに従い負の屈折力が弱くなる形状の非球
面より成っていることを特徴とする請求項1のコンパク
トなズームレンズ。5. The compact zoom lens according to claim 1, wherein a lens surface on the image surface side of said twelfth lens is formed of an aspheric surface having a shape in which negative refractive power decreases as the distance from the optical axis increases. .
曲率半径をR1としたとき 0.4<R1/fT<0.7 なる条件を満足することを特徴とする請求項1のコンパ
クトなズームレンズ。6. The compact lens according to claim 1, wherein the following condition is satisfied: 0.4 <R1 / fT <0.7, where R1 is the radius of curvature of the object-side lens surface of the eleventh lens. Zoom lens.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3202395A JP2988031B2 (en) | 1991-07-17 | 1991-07-17 | Compact zoom lens |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3202395A JP2988031B2 (en) | 1991-07-17 | 1991-07-17 | Compact zoom lens |
Publications (2)
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JPH0527171A JPH0527171A (en) | 1993-02-05 |
JP2988031B2 true JP2988031B2 (en) | 1999-12-06 |
Family
ID=16456788
Family Applications (1)
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JP3202395A Expired - Fee Related JP2988031B2 (en) | 1991-07-17 | 1991-07-17 | Compact zoom lens |
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Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002236254A (en) * | 2001-02-09 | 2002-08-23 | Sigma Corp | Zoom lens |
JP4503918B2 (en) * | 2002-11-20 | 2010-07-14 | オリンパス株式会社 | Imaging device |
JP4630568B2 (en) * | 2004-04-28 | 2011-02-09 | キヤノン株式会社 | Optical system and optical apparatus having the same |
JP2006003548A (en) * | 2004-06-16 | 2006-01-05 | Olympus Corp | Variable power optical system and electronic equipment using the same |
KR20220114408A (en) * | 2021-02-08 | 2022-08-17 | 삼성전자주식회사 | Optical lens assembly and electronic apparatus having the same |
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1991
- 1991-07-17 JP JP3202395A patent/JP2988031B2/en not_active Expired - Fee Related
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