JPH0921950A - Zoom lens - Google Patents
Zoom lensInfo
- Publication number
- JPH0921950A JPH0921950A JP16973195A JP16973195A JPH0921950A JP H0921950 A JPH0921950 A JP H0921950A JP 16973195 A JP16973195 A JP 16973195A JP 16973195 A JP16973195 A JP 16973195A JP H0921950 A JPH0921950 A JP H0921950A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- lens group
- focal length
- zoom lens
- zoom
- 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.)
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Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明はズームレンズに係わり、
特にビデオカメラ等に好適な小型で低コストの広角に適
したズームレンズに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom lens,
In particular, the present invention relates to a compact and low-cost wide-angle zoom lens suitable for video cameras and the like.
【0002】[0002]
【従来の技術】最近、固体撮像素子を用いた民主用ビデ
オカメラのズームレンズには、高変倍、大口径比化をは
かった高級機を求める一方で、低コスト、簡便性、広角
化を追求した普及機としてズーム比が3倍程度のものが
求められている。2. Description of the Related Art Recently, a zoom lens for a democratic video camera using a solid-state image pickup device is required to be a high-end model with a high zoom ratio and a large aperture ratio, but at the same time, it is required to have low cost, simplicity, and wide angle. As a popular machine pursued, one with a zoom ratio of about 3 is required.
【0003】従来から広角に適したレンズタイプとし
て、スチールカメラに用いられている負群先行の2群ズ
ームがあげられるが、このタイプをビデオカメラに用い
ると、スチールカメラ用のため射出瞳位置が短いので、
ピント面上での周辺光量が低下するなどの欠点があり不
適当であった。この問題を解決するために、第2レンズ
群の後方に正レンズ群を設けたものが、特開平3−11
653号公報に開示されている。Conventionally, as a lens type suitable for a wide angle, there is a negative group first two-group zoom used for a still camera. When this type is used for a video camera, an exit pupil position is used for a still camera. Because it's short
This is unsuitable because of the drawbacks such as a decrease in the amount of peripheral light on the focusing surface. In order to solve this problem, a positive lens group provided behind the second lens group is disclosed in JP-A-3-11.
It is disclosed in Japanese Patent No. 653.
【0004】また、低コストを実現させる手段の1つと
して、レンズ枚数を少なくするためガラスモールドレン
ズを利用することも知られているが、高価格なためレン
ズ全体として高価なものになってしまう。また、プラス
チックレンズを用いることで低コスト化を達成させる事
も考えられるが、一般に屈折率がガラスレンズより低
く、その種類を限られるため、従来の光学性能も維持し
つつ且つレンズ全体をコンパクトにすることが困難であ
った。It is also known to use a glass mold lens to reduce the number of lenses as one of means for realizing low cost, but it is expensive and the whole lens is expensive. . It is also possible to achieve cost reduction by using a plastic lens, but since the refractive index is generally lower than that of glass lenses and the types are limited, conventional optical performance is maintained and the entire lens is made compact. It was difficult to do.
【0005】[0005]
【発明が解決しようとする課題】本発明は、上記のよう
な課題に鑑みなされたもので、広角で変倍比3倍程度の
ズームレンズで、プラスチックレンズを多用することに
より、従来に比べ低コスト化をはかったズームレンズを
提供することを目的としている。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems. It is a zoom lens with a wide angle and a variable power ratio of about 3 times. The objective is to provide a zoom lens that is cost effective.
【0006】[0006]
【課題を解決するための手段】上記の目的は下記のよう
な手段により達成される。即ち、 (1)物体側から順に負の屈折力を持ち変倍中に光軸上
を移動する第1レンズ群と、正の屈折力を持ち変倍中に
光軸上を移動する第2レンズ群と、変倍中に固定である
正屈折力の第3レンズ群とからなる3群のズームレンズ
において、前記第1レンズ群は1枚の負の屈折力を持つ
ガラスレンズと少なくとも2枚以上のプラスチックレン
ズからなり、前記第2レンズ群は少なくとも1枚の正の
屈折力を持つガラスと少なくとも2枚以上のプラスチッ
クレンズとから構成したことを特徴とするズームレン
ズ。The above object is achieved by the following means. That is, (1) a first lens group having a negative refractive power in order from the object side and moving on the optical axis during zooming, and a second lens group having a positive refractive power and moving on the optical axis during zooming. In a zoom lens of three groups consisting of a group and a third lens group having a positive refractive power which is fixed during zooming, the first lens group includes one glass lens having a negative refractive power and at least two or more lenses. 2. The zoom lens, wherein the second lens group comprises at least one glass having a positive refractive power and at least two plastic lenses.
【0007】(2)物体側から順に負の屈折力を持ち変
倍中に光軸上を移動する第1レンズ群と、正の屈折力を
持ち変倍中に光軸上を移動する第2レンズ群と、変倍中
に固定である正屈折力の第3レンズ群とからなる3群の
ズームレンズにおいて、前記第1レンズ群は1枚の負の
屈折力を持つガラスレンズと少なくとも2枚以上のプラ
スチックレンズからなり、前記第2レンズ群は少なくと
も1枚の正の屈折力を持つガラスと少なくとも2枚以上
のプラスチックレンズとからなり 0.01<|FW/F1PL|<0.09 ・・・・・・ 但し、 F1PL;第1レンズ群中に含まれるプラスチックレンズ
の合成焦点距離 FW ;広角端の焦点距離 なる条件を満足するように構成したことを特徴とする
(1)記載のズームレンズ。(2) A first lens group having a negative refracting power in order from the object side and moving on the optical axis during zooming, and a second lens group having a positive refracting power and moving on the optical axis during zooming. In a zoom lens of three groups consisting of a lens group and a third lens group having a positive refractive power which is fixed during zooming, the first lens group includes one glass lens having a negative refractive power and at least two glass lenses. The second lens group comprises at least one glass having a positive refractive power and at least two plastic lenses. 0.01 <| FW / F1PL | <0.09 ...... However, F1 PL; combined focal length F W of the plastic lenses included in the first lens group; and characterized by being configured so as to satisfy the focal length condition of the wide-angle end (1) The described zoom lens.
【0008】(3)第2レンズ群は少なくとも1枚のガ
ラスレンズと少なくとも2枚のプラスチックレンズとか
らなり、 0<|FW/F2PL|<0.09 ・・・・・・ 但し、 F2PL;第2レンズ群中に含まれるプラスチックレンズ
の合成焦点距離 FW ;広角端の焦点距離 なる条件を満足するように構成したことを特徴とする
(1)または(2)記載のズームレンズ。(3) The second lens group is composed of at least one glass lens and at least two plastic lenses, and 0 <| F W / F2 PL | <0.09 ... The zoom lens according to (1) or (2) is characterized in that PL : a composite focal length of the plastic lens included in the second lens group, FW ; a focal length at the wide-angle end.
【0009】(4)第3レンズ群において 0.01<|FW/F3|<0.25 ・・・・・・ 但し、 F3;第3レンズ群の焦点距離 FW ;広角端の焦点距離 なる条件を満足するように構成したことを特徴とする
(1)、(2)または(3)記載のズームレンズであ
る。(4) 0.01 <| F W /F3|<0.25 in the third lens group, where F3; focal length of third lens group F W ; focal length at wide angle end The zoom lens according to (1), (2) or (3) is characterized in that the zoom lens is configured to satisfy the following condition.
【0010】[0010]
【作用】ここで、以上のように構成した作用について説
明する。FUNCTION Now, the function configured as above will be described.
【0011】(1)本発明のズームレンズは、第1レン
ズ群として物体側から順に負の屈折力を持ち変倍中に光
軸上を移動し、第2レンズ群として正の屈折力を持ち変
倍中に光軸上を移動し、さらに、第3レンズ群として、
変倍中に固定で正屈折力にする。ズームレンズは上記第
1レンズ群と第2レンズ群と第3レンズ群とからなる3
群のズームレンズであって、前記第1レンズ群は1枚の
負の屈折力を持つガラスレンズと少なくとも2枚以上の
プラスチックレンズからなり、さらに前記第2レンズ群
は少なくとも1枚の正の屈折力を持つガラスと少なくと
も2枚以上のプラスチックレンズとから構成したことを
特徴とするズームレンズである。(1) The zoom lens of the present invention has a negative refractive power as the first lens group in order from the object side, moves on the optical axis during zooming, and has a positive refractive power as the second lens group. It moves on the optical axis during zooming, and as a third lens group,
It has a fixed positive refractive power during zooming. The zoom lens is composed of the first lens group, the second lens group, and the third lens group.
A zoom lens of a group, wherein the first lens group comprises one glass lens having a negative refractive power and at least two plastic lenses, and the second lens group has at least one positive refractive power. A zoom lens comprising a glass having strength and at least two or more plastic lenses.
【0012】なお、第1レンズ群はプラスチックレンズ
の構成枚数を奇数枚としてもその目的を達することがで
きるが、プラスチックレンズは温度湿度等の環境変化に
敏感で、それによりピント位置がずれるなどの悪影響を
及ぼすため、温度湿度の変化を実用上問題ないレベルま
で抑え込むことが設計上の課題であり、本発明を実施す
るにあたっては正レンズと負レンズの対で用いることが
好ましい。The first lens group can achieve its purpose even if the number of plastic lenses is an odd number, but the plastic lens is sensitive to environmental changes such as temperature and humidity, and thus the focus position is displaced. Since it has an adverse effect, it is a design problem to suppress the change in temperature and humidity to a level at which there is no practical problem, and it is preferable to use a pair of a positive lens and a negative lens in implementing the present invention.
【0013】(2)本発明のズームレンズは、第1レン
ズ群として物体側から順に負の屈折力を持ち変倍中に光
軸上を移動し、第2レンズ群として正の屈折力を持ち変
倍中に光軸上を移動し、さらに、第3レンズ群として、
変倍中に固定で正屈折力にする。ズームレンズは上記第
1レンズ群と第2レンズ群と第3レンズ群とからなる3
群のズームレンズであって、前記第1レンズ群は1枚の
負の屈折力を持つガラスレンズと少なくとも2枚以上の
プラスチックレンズからなり、さらに前記第2レンズ群
は少なくとも1枚の正の屈折力を持つガラスと少なくと
も2枚以上のプラスチックレンズとから構成したことを
特徴とするズームレンズで、以下の式を満足させる。(2) The zoom lens of the present invention has a negative refractive power as the first lens group in order from the object side, moves on the optical axis during zooming, and has a positive refractive power as the second lens group. It moves on the optical axis during zooming, and as a third lens group,
It has a fixed positive refractive power during zooming. The zoom lens is composed of the first lens group, the second lens group, and the third lens group.
A zoom lens of a group, wherein the first lens group comprises one glass lens having a negative refractive power and at least two plastic lenses, and the second lens group has at least one positive refractive power. A zoom lens characterized by being composed of glass having strength and at least two or more plastic lenses, which satisfies the following formula.
【0014】 0.01<|FW/F1PL|<0.09 ・・・・・・ F1PL;第1レンズ群中に含まれるプラスチックレンズ
の合成焦点距離 FW ;広角端の焦点距離 もしも、式で|FW/F1PL|値が上限値が越えると
温湿度のピントずれが実用上許容できなくなってしま
う。逆に式で|FW/F1PL|の値が下限値を越える
と温湿度の影響を殆ど受けなくなる点では好ましいが、
第1レンズ群に含まれるガラスレンズのパワーが強くな
り過ぎ、可動の第1レンズ群の誤差感度が増大し生産性
が悪くなる。0.01 <| F W / F1 PL | <0.09 ... F1 PL ; composite focal length of plastic lenses included in the first lens group F W ; focal length at wide angle end If the | FW / F1PL | value in the equation exceeds the upper limit value, the focus shift of temperature and humidity becomes practically unacceptable. On the other hand, if the value of | FW / F1PL | in the equation exceeds the lower limit, it is preferable in that it is hardly affected by temperature and humidity.
The power of the glass lens included in the first lens group becomes too strong, the error sensitivity of the movable first lens group increases, and the productivity deteriorates.
【0015】さらに、以下の式を満足させることが好ま
しい。Further, it is preferable to satisfy the following equation.
【0016】 0.02<|FW/F1PL|<0.07 ・・・・・・ ′ ′式で|FW/F1PL|値が上限値以内であれば温湿
度の影響は微小な許容ピントずれにとどまる。また′
式で|FW/F1PL|値が下限値以内であれば温湿度の
影響を殆ど受けず、第1レンズ群に含まれるガラスレン
ズのパワーが強くなり過ぎることもなく、可動の第1レ
ンズ群の誤差感度が増さずに生産性がより良い。0.02 <| F W / F1 PL | <0.07 ·································· If the value | F W / F1 PL | It stays within the allowable focus shift. Also'
If the | FW / F1PL | value in the formula is within the lower limit, it is hardly affected by temperature and humidity, and the power of the glass lens included in the first lens group does not become too strong. Better productivity without increasing error sensitivity of the group.
【0017】(3)第2レンズ群に含まれるプラスチッ
クレンズも上記と同様に耐環境に対し以下の条件を満足
する。(3) The plastic lens included in the second lens group also satisfies the following conditions with respect to the environment resistance as described above.
【0018】 0<|FW/F2PL|<0.09 ・・・・・・ F2PL;第2レンズ群中に含まれるプラスチックの合成
焦点距離、式で|FW/F2PL|値が上限値が越える
と温湿度のピントずれが実用上許容できなくなってしま
う。逆に式で|FW/F2PL|の値が下限値を越える
と温湿度の影響を殆ど受けなくなる点では好ましいが、
第2レンズ群に含まれるガラスレンズのパワーが強くな
り過ぎ、可動の第2レンズ群の誤差感度が増大し生産性
が悪くなる。0 <| F W / F2 PL | <0.09 ··· F2 PL ; synthetic focal length of the plastic contained in the second lens group, | F W / F2 PL | If the upper limit is exceeded, the focus shift of temperature and humidity becomes unacceptable for practical use. Conversely the formula | F W / F2 PL | value although the preferable because not affected little by the temperature and humidity exceeds the lower limit,
The power of the glass lens included in the second lens group becomes too strong, the error sensitivity of the movable second lens group increases, and the productivity deteriorates.
【0019】さらに、以下の式を満足させることが好ま
しい。Further, it is preferable to satisfy the following formula.
【0020】 0.01<|FW/F2PL|<0.07 ・・・・・・ ′ ′式で|FW/F2PL|値が上限値以内であれば温湿
度の影響は微小な許容ピントずれにとどまる。また′
式で|FW/F2PL|値が下限値以内であれば温湿度の
影響を殆ど受けず、第2レンズ群に含まれるガラスレン
ズのパワーが強くなり過ぎることもなく、可動の第2レ
ンズ群の誤差感度が増さずに生産性がより良い。[0020] 0.01 <| F W / F2 PL | <0.07 ······ '' expression in the | F W / F2 PL | influence the value is if the temperature and humidity it is within the upper limit value is very small It stays within the allowable focus shift. Also'
Expressions | F W / F2 PL | value hardly affected in if the temperature and humidity is within the lower limit, it no power becomes too strong of a glass lens in the second lens group, the second lens movable Better productivity without increasing error sensitivity of the group.
【0021】(4)第3レンズ群は以下の条件を満足さ
せる。(4) The third lens group satisfies the following conditions.
【0022】 0.01<|FW/F3|<0.25 ・・・・・・ 但し、 F3;第3レンズ群の焦点距離 式の|FW/F3|値が下限値を越えると射出瞳位置
には有利であるが、バックフォーカスが長くなるため全
長が大きくなる。逆に|FW/F3|値が上限値が越え
ると射出瞳位置を遠方にすることができなくなる。0.01 <| F W /F3|<0.25, where F3; injection is performed when the | F W / F3 | value of the focal length formula of the third lens group exceeds the lower limit value. This is advantageous for the pupil position, but since the back focus becomes long, the total length becomes large. On the other hand, if the | F W / F3 | value exceeds the upper limit, the exit pupil position cannot be moved to a distant position.
【0023】さらに、以下の式を満足させることが好ま
しい。Further, it is preferable to satisfy the following equation.
【0024】 0.02<|FW/F3|<0.15 ・・・・・・ ′ ′式の|FW/F3|値が下限値以内であると射出瞳
位置には有利で、バックフォーカスが長くならず全長が
より短くなる。また、′式で|FW/F3|値が上限
値以内であれば射出瞳位置を十分遠方にすることができ
る。0.02 <| F W /F3|<0.15 ································· The value | F W / F3 | The focus is not long and the total length is shorter. Further, if the | FW / F3 | value in the equation 'is within the upper limit value, the exit pupil position can be made sufficiently far away.
【0025】[0025]
【実施例】以下、図1と図5に示すレンズ系の構成図に
基づいて本発明を詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the lens system configuration diagrams shown in FIGS.
【0026】本発明に係わるレンズ系は、物体側から順
に負の屈折力を持ち変倍中に光軸上を移動する第1レン
ズ群、正の屈折力を持ち変倍中の光軸上を移動する第2
レンズ群、そして変倍中に固定である正屈折力の第3レ
ンズ群からなる3群ズームレンズにより構成されてい
る。In the lens system according to the present invention, the first lens group having a negative refractive power in order from the object side and moving on the optical axis during zooming, has a positive refractive power, and moves on the optical axis during zooming. Second to move
It is composed of a lens group and a third group zoom lens composed of a third lens group having a positive refractive power which is fixed during zooming.
【0027】下記に前述の条件式を満足する実施例を示
す。ここで、使用する各記号について説明する。Rは各
レンズ面の曲率半径、Dはレンズの中心厚またはレンズ
間隔、Nは硝子材d線に対する屈折率、νdはd線に対
するアッベ数、2ωは画角、Fnoはfナンバー、fは
焦点距離、a,bは各ポジションのレンズ群間隔をそれ
ぞれ示す。また、「*」印はプラスチックレンズである
ことを示す。また、非球面の形状は、次の「数1」で表
している。An embodiment satisfying the above conditional expression will be shown below. Here, each symbol used will be described. R is the radius of curvature of each lens surface, D is the center thickness of the lens or the lens interval, N is the refractive index for the glass material d line, νd is the Abbe number for the d line, 2ω is the angle of view, Fno is the f number, and f is the focus. The distances a and b indicate the lens group intervals at each position. In addition, “*” indicates that the lens is a plastic lens. Further, the shape of the aspherical surface is represented by the following "Equation 1".
【0028】[0028]
【数1】 [Equation 1]
【0029】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 Y;非球面の頂点を原点とし、光軸に垂直な座標 r;非球面の近軸曲率半径 K;面の円錐定数 A4,A6,A8,A10;非球面係数。Where X is the origin of the aspherical vertex and the coordinates are from the object side to the image side along the optical axis Y; the aspherical vertex is the origin and the coordinates are perpendicular to the optical axis r; Axial radius of curvature K; surface conical constants A 4 , A 6 , A 8 , A 10 ; aspherical coefficient.
【0030】<実施例1>本発明に係わる実施例1のレ
ンズデータは「表1」に示すとおりである。Example 1 The lens data of Example 1 according to the present invention are as shown in "Table 1".
【0031】[0031]
【表1】 [Table 1]
【0032】<実施例2>また、本発明に係わる実施例
2のレンズデータは「表2」に示すとおりである。<Embodiment 2> Further, lens data of Embodiment 2 according to the present invention is as shown in "Table 2".
【0033】[0033]
【表2】 [Table 2]
【0034】ここで、本発明に係わる実施例の前記条件
式に係わる数値を「表3」に、また表4に元レンズデー
タを示す。Numerical values relating to the conditional expressions of the examples according to the present invention are shown in "Table 3", and Table 4 shows original lens data.
【0035】[0035]
【表3】 [Table 3]
【0036】[0036]
【表4】 [Table 4]
【0037】上記、表3に示すように、実施例1と実施
例2ともに条件式の数値を満足する値となっている。As shown in Table 3 above, both Example 1 and Example 2 have values satisfying the numerical values of the conditional expressions.
【0038】なお、本発明のズームレンズは、プラスチ
ックレンズを多用してコンパクトなレンズの設計を試み
ると、特に屈折率の自由度が小さいために諸収差の補正
が非常に難しくなる。そこで、本発明の実施例では、第
1レンズ群と第2レンズ群に少なくとも2面以上の非球
面を設けている。第1レンズ群の非球面は高画角の像高
に対し、特に歪曲収差の補正を良好に行え、第2レンズ
群の非球面は選択的に変倍時の球面収差補正や高次のコ
マ収差補正を行っている。In the zoom lens according to the present invention, when plastic lenses are frequently used and a compact lens design is attempted, it becomes very difficult to correct various aberrations because the degree of freedom of the refractive index is particularly small. Therefore, in the embodiment of the present invention, at least two or more aspherical surfaces are provided in the first lens group and the second lens group. The aspherical surface of the first lens group can perform good correction of distortion especially for an image height of a high angle of view, and the aspherical surface of the second lens group selectively corrects spherical aberration during zooming and high-order coma. Aberration correction is performed.
【0039】また、本発明の実施例では第2レンズ群中
に含まれるプラスチックレンズを貼り合わせレンズで構
成している。これはプラスチックレンズに効果の高い反
射防止コートを施すことは非常に難しく、従って光量損
失が大きくなり透過率が低下するためである。そのた
め、2枚のプラスチックレンズを接合し、レンズ面を減
らし、光量損失を小さくしている。In the embodiment of the present invention, the plastic lens included in the second lens group is composed of a cemented lens. This is because it is very difficult to apply a highly effective antireflection coating to a plastic lens, and thus the loss of light amount becomes large and the transmittance decreases. Therefore, two plastic lenses are cemented together to reduce the lens surface and reduce the light amount loss.
【0040】次に、これらの実施例1から2の各実施例
の収差図に示す通り、何れの収差についても良好に補正
され、優秀なレンズ系となっている。Next, as shown in the aberration diagrams of each of Examples 1 and 2, any aberration is satisfactorily corrected, and the lens system is excellent.
【0041】実施例1において、広角端については図2
の球面収差、非点収差、歪曲収差に示す通り、また、中
間焦点距離については図3の球面収差、非点収差、歪曲
収差に示す通り、また、望遠端については図4の球面収
差、非点収差、歪曲収差に示す通りそれぞれ良好な結果
が得られている。In Embodiment 1, the wide-angle end is shown in FIG.
Spherical aberration, astigmatism, and distortion aberration of FIG. 4, intermediate focal length as shown in FIG. 3 of spherical aberration, astigmatism, and distortion aberration, and at the telephoto end of FIG. Good results are obtained as shown in the point aberration and the distortion.
【0042】次に、実施例2において、広角端について
は図6の球面収差、非点収差、歪曲収差に示す通り、ま
た、中間焦点距離については図7の球面収差、非点収
差、歪曲収差に示す通り、また、望遠端については図8
の球面収差、非点収差、歪曲収差に示す通りそれぞれ良
好な結果が得られている。Next, in Example 2, as shown in the spherical aberration, astigmatism, and distortion aberration of FIG. 6 at the wide-angle end, and for the intermediate focal length, the spherical aberration, astigmatism, and distortion aberration of FIG. As shown in Fig. 8 and at the telephoto end,
Good results are obtained as shown in the spherical aberration, astigmatism, and distortion.
【0043】なお、本発明は上述した実施例に限定され
るものではなく、その要旨を逸脱しない範囲で種々に変
形実施することができる。The present invention is not limited to the above-described embodiments, but various modifications can be made without departing from the scope of the invention.
【0044】[0044]
【発明の効果】以上のように構成したので、小型のビデ
オカメラ等に用いるのに好適で、変倍比が3倍程度で、
広角に適したズームレンズでプラスチックレンズを多用
した、従来に比べ低コスト化を行ったズームレンズとな
った。With the above-mentioned structure, it is suitable for use in a small video camera or the like, and the zoom ratio is about 3 times.
It is a zoom lens that uses a lot of plastic lenses as a zoom lens suitable for a wide angle and that has a lower cost than the conventional one.
【図1】実施例1のレンズ系の光学系構成図である。FIG. 1 is a configuration diagram of an optical system of a lens system of Example 1.
【図2】実施例1の広角端の球面収差、非点収差、歪曲
収差の特性図を示す。FIG. 2 is a characteristic diagram of spherical aberration, astigmatism, and distortion at the wide-angle end according to the first exemplary embodiment.
【図3】実施例1の中間焦点距離の球面収差、非点収
差、歪曲収差の特性図を示す。FIG. 3 is a characteristic diagram of spherical aberration, astigmatism, and distortion at the intermediate focal length of Example 1.
【図4】実施例1の望遠端の球面収差、非点収差、歪曲
収差の特性図を示す。FIG. 4 is a characteristic diagram of spherical aberration, astigmatism, and distortion at the telephoto end according to the first exemplary embodiment.
【図5】実施例2のレンズ系の光学系構成図である。5 is an optical system configuration diagram of a lens system of Example 2. FIG.
【図6】実施例2の広角端の球面収差、非点収差、歪曲
収差の特性図を示す。FIG. 6 is a characteristic diagram of spherical aberration, astigmatism, and distortion at the wide-angle end according to the second exemplary embodiment.
【図7】実施例2の中間焦点距離の球面収差、非点収
差、歪曲収差の特性図を示す。FIG. 7 is a characteristic diagram of spherical aberration, astigmatism, and distortion at the intermediate focal length of Example 2.
【図8】実施例2の望遠端の球面収差、非点収差、歪曲
収差の特性図を示す。FIG. 8 is a characteristic diagram of spherical aberration, astigmatism, and distortion at the telephoto end of the second embodiment.
1 第1面 2 第2面 3 第3面 4 第4面 5 第5面 6 第6面 7 第7面 8 第8面 9 第9面 10 第10面 11 第11面 12 第12面 13 第13面 14 第14面 15 第15面 16 第16面 17 第17面 1 1st surface 2 2nd surface 3 3rd surface 4 4th surface 5 5th surface 6 6th surface 7 7th surface 8 8th surface 9 9th surface 10 10th surface 11 11th surface 12 12th surface 13th 13th surface 14 14th surface 15th 15th surface 16 16th surface 17 17th surface
Claims (4)
に光軸上を移動する第1レンズ群と、正の屈折力を持ち
変倍中に光軸上を移動する第2レンズ群と、変倍中に固
定である正屈折力の第3レンズ群とからなる3群のズー
ムレンズにおいて、前記第1レンズ群は1枚の負の屈折
力を持つガラスレンズと少なくとも2枚以上のプラスチ
ックレンズからなり、前記第2レンズ群は少なくとも1
枚の正の屈折力を持つガラスと少なくとも2枚以上のプ
ラスチックレンズとから構成したことを特徴とするズー
ムレンズ。1. A first lens unit having a negative refracting power and moving along the optical axis during zooming in order from the object side, and a second lens group having a positive refracting power and moving along the optical axis during zooming. In a zoom lens of three groups consisting of a group and a third lens group having a positive refractive power which is fixed during zooming, the first lens group includes one glass lens having a negative refractive power and at least two or more lenses. The second lens group comprises at least one
A zoom lens comprising one glass having a positive refractive power and at least two plastic lenses.
ックレンズの合成焦点距離と広角端の焦点距離との関係
が 0.01<|FW/F1PL|<0.09 但し、 F1PL;第1レンズ群中に含まれるプラスチックレンズ
の合成焦点距離 FW ;広角端の焦点距離 なる条件を満足するように構成したことを特徴とする請
求項1記載のズームレンズ。2. The relationship between the combined focal length of the plastic lenses included in the first lens group and the focal length at the wide-angle end is 0.01 <| FW / F1PL | <0.09, where F1PL ; The zoom lens according to claim 1, wherein the zoom lens is configured so as to satisfy a condition that a composite focal length F W of a plastic lens included in the first lens group; a focal length at a wide-angle end.
ックレンズの合成焦点距離と広角端の焦点距離との関係
が 0<|FW/F2PL|<0.09 但し、 F2PL;第2レンズ群中に含まれるプラスチックレンズ
の合成焦点距離 FW ;広角端の焦点距離 なる条件を満足するように構成したことを特徴とする請
求項1または請求項2記載のズームレンズ。3. A relationship between the focal length of the composite focal distance and a wide-angle end of the plastic lenses included in the second lens group 0 <| F W / F2 PL | <0.09 where, F2 PL; a second The zoom lens according to claim 1, wherein the zoom lens is configured so as to satisfy the following conditions: composite focal length F W of plastic lens included in lens group; focal length at wide-angle end.
焦点距離との関係が 0.01<|FW/F3|<0.25 但し、 F3;第3レンズ群の焦点距離 FW ;広角端の焦点距離 なる条件を満足するように構成したことを特徴とする請
求項1、2または3記載のズームレンズ。4. The relationship between the focal length of the third lens group and the focal length at the wide-angle end is 0.01 <| F W /F3|<0.25, where F3; the focal length of the third lens unit F W The zoom lens according to claim 1, 2 or 3, wherein the zoom lens is configured to satisfy a condition of a focal length at a wide-angle end.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16973195A JP3465036B2 (en) | 1995-07-05 | 1995-07-05 | Zoom lens |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16973195A JP3465036B2 (en) | 1995-07-05 | 1995-07-05 | Zoom lens |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0921950A true JPH0921950A (en) | 1997-01-21 |
JP3465036B2 JP3465036B2 (en) | 2003-11-10 |
Family
ID=15891811
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16973195A Expired - Fee Related JP3465036B2 (en) | 1995-07-05 | 1995-07-05 | Zoom lens |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3465036B2 (en) |
Cited By (16)
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---|---|---|---|---|
JP2001033702A (en) * | 1999-07-26 | 2001-02-09 | Canon Inc | Zoom lens |
EP1093000A2 (en) | 1999-10-06 | 2001-04-18 | Canon Kabushiki Kaisha | Zoom lens and optical apparatus having the same |
US6229655B1 (en) | 1998-12-22 | 2001-05-08 | Minolta Co., Ltd. | Zoom lens system |
JP2001141997A (en) * | 1999-11-12 | 2001-05-25 | Olympus Optical Co Ltd | Zoom lens |
WO2002082158A1 (en) * | 2001-04-02 | 2002-10-17 | Matsushita Electric Industrial Co., Ltd. | Zoom lens and electronic still camera using it |
US6735020B2 (en) | 2001-08-07 | 2004-05-11 | Canon Kabushiki Kaisha | Zoom lens and image pickup apparatus |
KR100467953B1 (en) * | 2002-04-02 | 2005-01-24 | 삼성테크윈 주식회사 | Zoom lens |
US6853498B2 (en) | 2003-06-18 | 2005-02-08 | Samsung Techwin Co., Ltd. | Zoom lens |
US6924939B2 (en) | 2002-08-19 | 2005-08-02 | Canon Kabushiki Kaisha | Zoom lens system, and image pick-up apparatus incorporating such zoom lens system |
US7212351B2 (en) | 2005-04-28 | 2007-05-01 | Olympus Imaging Corp. | Zoom optical system and image taking apparatus using the same |
CN100406952C (en) * | 2004-04-13 | 2008-07-30 | 日中龙光学有限公司 | Zoom optic system and optic device |
JP2010049261A (en) * | 2009-09-04 | 2010-03-04 | Olympus Corp | Zoom lens, and camera equipped with the same and imaging element |
JP2012073635A (en) * | 2011-11-24 | 2012-04-12 | Olympus Corp | Zoom lens and camera with zoom lens and imaging device |
WO2013175722A1 (en) * | 2012-05-25 | 2013-11-28 | 富士フイルム株式会社 | Zoom lens and imaging device |
US9122041B2 (en) | 2011-09-02 | 2015-09-01 | Samsung Electronics Co., Ltd. | Zoom lens and photographing apparatus including the same |
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-
1995
- 1995-07-05 JP JP16973195A patent/JP3465036B2/en not_active Expired - Fee Related
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US6456443B2 (en) | 1998-12-22 | 2002-09-24 | Minolta Co., Ltd. | Zoom lens system |
US6229655B1 (en) | 1998-12-22 | 2001-05-08 | Minolta Co., Ltd. | Zoom lens system |
JP4532627B2 (en) * | 1999-07-26 | 2010-08-25 | キヤノン株式会社 | Zoom lens |
JP2001033702A (en) * | 1999-07-26 | 2001-02-09 | Canon Inc | Zoom lens |
US6498687B1 (en) | 1999-10-06 | 2002-12-24 | Canon Kabushiki Kaisha | Zoom lens and optical apparatus having the same |
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EP1093000A3 (en) * | 1999-10-06 | 2004-05-19 | Canon Kabushiki Kaisha | Zoom lens and optical apparatus having the same |
JP2001141997A (en) * | 1999-11-12 | 2001-05-25 | Olympus Optical Co Ltd | Zoom lens |
US6614599B1 (en) | 1999-11-12 | 2003-09-02 | Olympus Optical Co., Ltd. | Zoom lens system, and image pickup system using the same |
US6819499B2 (en) | 1999-11-12 | 2004-11-16 | Olympus Corporation | Zoom lens system, and image pickup system using the same |
US6925253B2 (en) | 2001-04-02 | 2005-08-02 | Matsushita Electric Industrial Co., Ltd. | Zoom lens and electronic still camera using it |
WO2002082158A1 (en) * | 2001-04-02 | 2002-10-17 | Matsushita Electric Industrial Co., Ltd. | Zoom lens and electronic still camera using it |
US6735020B2 (en) | 2001-08-07 | 2004-05-11 | Canon Kabushiki Kaisha | Zoom lens and image pickup apparatus |
KR100467953B1 (en) * | 2002-04-02 | 2005-01-24 | 삼성테크윈 주식회사 | Zoom lens |
US6924939B2 (en) | 2002-08-19 | 2005-08-02 | Canon Kabushiki Kaisha | Zoom lens system, and image pick-up apparatus incorporating such zoom lens system |
US6853498B2 (en) | 2003-06-18 | 2005-02-08 | Samsung Techwin Co., Ltd. | Zoom lens |
CN100406952C (en) * | 2004-04-13 | 2008-07-30 | 日中龙光学有限公司 | Zoom optic system and optic device |
US7212351B2 (en) | 2005-04-28 | 2007-05-01 | Olympus Imaging Corp. | Zoom optical system and image taking apparatus using the same |
JP2010049261A (en) * | 2009-09-04 | 2010-03-04 | Olympus Corp | Zoom lens, and camera equipped with the same and imaging element |
US9122041B2 (en) | 2011-09-02 | 2015-09-01 | Samsung Electronics Co., Ltd. | Zoom lens and photographing apparatus including the same |
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US9297989B2 (en) | 2012-05-25 | 2016-03-29 | Fujifilm Corporation | Zoom lens and imaging apparatus |
JP2017037164A (en) * | 2015-08-10 | 2017-02-16 | キヤノン株式会社 | Zoom lens and imaging device having the same |
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