JP2001356266A - Zoom lens - Google Patents

Zoom lens

Info

Publication number
JP2001356266A
JP2001356266A JP2000176837A JP2000176837A JP2001356266A JP 2001356266 A JP2001356266 A JP 2001356266A JP 2000176837 A JP2000176837 A JP 2000176837A JP 2000176837 A JP2000176837 A JP 2000176837A JP 2001356266 A JP2001356266 A JP 2001356266A
Authority
JP
Japan
Prior art keywords
lens
negative
positive
refractive power
telephoto
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2000176837A
Other languages
Japanese (ja)
Inventor
Toshiyuki Nagaoka
利之 永岡
Original Assignee
Olympus Optical Co Ltd
オリンパス光学工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Olympus Optical Co Ltd, オリンパス光学工業株式会社 filed Critical Olympus Optical Co Ltd
Priority to JP2000176837A priority Critical patent/JP2001356266A/en
Publication of JP2001356266A publication Critical patent/JP2001356266A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide a zoom lens consisting of a small number of lenses such as four or five lenses and having a high variable power ratio such as the one exceeding 3. SOLUTION: In the case of constituting the zoom lens of two groups, it is constituted of a 1st group having positive refractive power, an aperture diaphragm and a 2nd group having negative refractive power, and the 1st group having the positive refractive power is constituted of a negative lens and a positive lens, and the 2nd group having the negative refractive power is constituted of a positive lens and a negative lens, and then it satisfies a condition (1). (1) 3<ft/fw<5 In the case of constituting the zoom lens of three groups, it is constituted of a 1st group having positive refractive power, a 2nd group having negative refractive power and a 3rd group having negative refractive power and satisfies a condition (2). (2) 2.5<ft/fw<5.5 Provided that ft means the focal distance on a telephoto end side and fw means the focal distance on a wide-angle end side.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【0001】[0001]
【発明の属する技術分野】本発明は、レンズ枚数が少な
い小型のズームレンズに関するものであり、例えば、銀
塩カメラの撮影レンズに適した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 small zoom lens having a small number of lenses, for example, a zoom lens suitable for a photographing lens of a silver halide camera.
【0002】[0002]
【従来の技術】近年、カメラの小型化および低価格化が
進む一方で、高い変倍比を持つズームレンズの要求も高
まっている。特に、安価に構成するためレンズ枚数が4
枚乃至5枚と少ない枚数でコンパクトに構成され、変倍
比が大きいレンズ系が求められている。レンズ枚数が5
枚で構成されたズームレンズの例として、特開平4-2644
13号公報が知られている。また、レンズ枚数が4枚で構
成された例として、特開平6-67092号公報、特開平7-225
337号公報、特開平8-220433号公報、特開平8-220435号
公報、特開平8-338946号公報が知られている。
2. Description of the Related Art In recent years, as the size and cost of cameras have been reduced, the demand for zoom lenses having a high zoom ratio has also increased. In particular, the number of lenses is 4
There is a demand for a lens system which is compact with as few as five to five lenses and has a large zoom ratio. 5 lenses
Japanese Patent Application Laid-Open No. 4-2644 as an example of a zoom lens composed of
No. 13 is known. As examples in which the number of lenses is four, see JP-A-6-67092 and JP-A-7-225.
No. 337, JP-A-8-220433, JP-A-8-220435, and JP-A-8-338946 are known.
【0003】[0003]
【発明が解決しようとする課題】しかし、特開平4-2644
13号公報に開示されているズームレンズは、変倍比が
2.3倍程度と小さい。特開平6-67092号公報、特開平7-
225337号公報、特開平8-220433号公報、特開平8-220435
号公報、特開平8-338946号公報に開示されているズーム
レンズも、変倍比は最大でも2.8倍程度である。この
ように従来は、例えば3倍を超える高変倍なズームレン
ズの設計はなされていない。
SUMMARY OF THE INVENTION However, Japanese Patent Application Laid-Open No.
The zoom lens disclosed in Japanese Patent Publication No. 13 has a small zoom ratio of about 2.3 times. JP-A-6-67092, JP-A-7-670
No. 225337, JP-A-8-220433, JP-A-8-220435
The zoom lens disclosed in Japanese Patent Application Laid-Open No. 8-338946 also has a zoom ratio of about 2.8 at the maximum. As described above, a zoom lens having a high zoom ratio exceeding, for example, three times has not been designed.
【0004】本発明は、このような状況に鑑みてなされ
たもので、例えば、レンズ枚数が4枚乃至5枚で変倍比
が3倍を超えるというように、少ないレンズ枚数で高い
変倍比を有するズームレンズを提供することを目的とす
る。
The present invention has been made in view of such a situation, and for example, a high zoom ratio with a small number of lenses, such as a case where the number of lenses is 4 to 5 and the zoom ratio exceeds 3 times. It is an object to provide a zoom lens having:
【0005】[0005]
【課題を解決するための手段】本発明のズームレンズ
は、物体側より順に、正屈折力の第1群と、明るさ絞り
と、負屈折力の第2群で構成され、前記正屈折力の第1
群は負レンズと正レンズで構成され、前記負屈折力の第
2群は正レンズと負レンズで構成され、条件(1)を満
足することを特徴としている。
The zoom lens according to the present invention comprises, in order from the object side, a first group having a positive refractive power, a stop, and a second group having a negative refractive power. First
The group includes a negative lens and a positive lens, and the second group having the negative refractive power includes a positive lens and a negative lens, and satisfies the condition (1).
【0006】(1) 3<ft/fw<5 ただし、ftは望遠端の焦点距離、fwは広角端の焦点
距離である。また、本発明の別のズームレンズは、物体
側より順に、正屈折力の第1群と、明るさ絞りと、負屈
折力の第2群で構成され、前記正屈折力の第1群は負レ
ンズと正レンズで構成され、前記負屈折力の第2群は合
成屈折力が正となる2枚のレンズと負レンズで構成さ
れ、条件(1)を満足することを特徴としている。
(1) 3 <ft / fw <5 where ft is the focal length at the telephoto end and fw is the focal length at the wide-angle end. Further, another zoom lens according to the present invention includes, in order from the object side, a first group having a positive refractive power, a brightness stop, and a second group having a negative refractive power. The second group of negative refracting power is composed of a negative lens and a positive lens, and the second group of negative refracting power is composed of two lenses having a positive combined refracting power and a negative lens, and satisfies the condition (1).
【0007】(1) 3<ft/fw<5 ただし、ftは望遠端の焦点距離、fwは広角端の焦点
距離である。また、本発明の別のズームレンズは、物体
側より順に、正屈折力の第1群と、負屈折力の第2群
と、負屈折力の第3群で構成され、条件(2)を満足す
ることを特徴としている。
(1) 3 <ft / fw <5 where ft is the focal length at the telephoto end, and fw is the focal length at the wide-angle end. Further, another zoom lens according to the present invention includes, in order from the object side, a first unit having a positive refractive power, a second unit having a negative refractive power, and a third unit having a negative refractive power. It is characterized by satisfaction.
【0008】(2) 2.5<ft/fw<5.5 ただし、ftは望遠端の焦点距離、fwは広角端の焦点
距離である。また、本発明の別のズームレンズは、物体
側より順に、正屈折力の第1群と、負屈折力の第2群
と、負屈折力の第3群で構成され、いずれの群も変倍時
に可動であり、前記正屈折力の第1群は負レンズと正レ
ンズで構成され、前記負屈折力の第2群は正レンズと負
レンズで構成され、前記負屈折力の第3群は負レンズ1
枚で構成されていることを特徴としている。
(2) 2.5 <ft / fw <5.5 where ft is the focal length at the telephoto end, and fw is the focal length at the wide-angle end. Further, another zoom lens according to the present invention includes, in order from the object side, a first group having a positive refractive power, a second group having a negative refractive power, and a third group having a negative refractive power. Movable at the time of magnification, the first group having the positive refractive power includes a negative lens and a positive lens, the second group having the negative refractive power includes a positive lens and a negative lens, and the third group having the negative refractive power. Is negative lens 1
It is characterized by being constituted by sheets.
【0009】[0009]
【発明の実施の形態】本発明のズームレンズの第1の構
成は、物体側より順に、正屈折力の第1群と、明るさ絞
りと、負屈折力の第2群で構成され、第1群は負レンズ
と正レンズで構成され、第2群は正レンズと負レンズで
構成され、条件(1)を満足するものである。
DESCRIPTION OF THE PREFERRED EMBODIMENTS A first configuration of a zoom lens according to the present invention comprises, in order from the object side, a first group having a positive refractive power, a brightness stop, and a second group having a negative refractive power. The first group includes a negative lens and a positive lens, and the second group includes a positive lens and a negative lens, and satisfies the condition (1).
【0010】(1) 3<ft/fw<5 ただし、ftは望遠端の焦点距離、fwは広角端の焦点
距離である。屈折力が正・負の2群構成のズームレンズ
において、少ないレンズ枚数で高い変倍比を有するズー
ムレンズを達成するためには、物体側より順に、負レン
ズと正レンズの第1群と、明るさ絞りと、正レンズと負
レンズの第2群で構成することが望ましい。条件(1)
は高い変倍比を有するズームレンズを達成するための条
件である。条件(1)の下限値の3を超えると変倍比が
小さくなる。また、上限値の5を超えると広角端から望
遠端へかけての収差補正が困難となり、良好な結像性能
を得ることができない。
(1) 3 <ft / fw <5 where ft is the focal length at the telephoto end, and fw is the focal length at the wide-angle end. In order to achieve a zoom lens having a high zoom ratio with a small number of lenses in a two-group zoom lens having positive and negative refractive powers, in order from the object side, a first group of a negative lens and a positive lens, It is desirable to include a brightness stop and a second group of a positive lens and a negative lens. Condition (1)
Is a condition for achieving a zoom lens having a high zoom ratio. If the lower limit of 3 of the condition (1) is exceeded, the zoom ratio becomes small. On the other hand, when the value exceeds the upper limit of 5, it becomes difficult to correct aberrations from the wide-angle end to the telephoto end, so that good imaging performance cannot be obtained.
【0011】また、条件(1)を満足する範囲であって
も、変倍比が大きいほど各レンズを通る光線位置が広角
端と望遠端で大きく異なってしまう。この場合、特に、
広角端の軸外収差と望遠端の球面収差の補正が課題とな
る。そこで、本発明では負レンズ、正レンズ、絞り、正
レンズ、負レンズというように、絞りを挟んで左右の屈
折力が対称になるようにレンズを配置することによっ
て、広角端の軸外収差を良好に補正している。
Further, even within the range satisfying the condition (1), the position of the light beam passing through each lens is greatly different between the wide-angle end and the telephoto end as the magnification ratio increases. In this case, in particular,
The problem is to correct off-axis aberrations at the wide-angle end and spherical aberrations at the telephoto end. Therefore, in the present invention, the off-axis aberration at the wide-angle end is reduced by arranging lenses such as a negative lens, a positive lens, an aperture, a positive lens, and a negative lens so that the left and right refractive powers are symmetrical across the aperture. Corrected well.
【0012】本発明のズームレンズの第2の構成は、物
体側より順に、正屈折力の第1群と、明るさ絞りと、負
屈折力の第2群で構成され、前記正屈折力の第1群は負
レンズと正レンズで構成され、前記負屈折力の第2群は
合成屈折力が正となる2枚のレンズと負レンズで構成さ
れ、条件(1)を満足するものである。
A second configuration of the zoom lens according to the present invention comprises, in order from the object side, a first group having a positive refractive power, a stop, and a second group having a negative refractive power. The first group includes a negative lens and a positive lens, and the second group having the negative refractive power includes two lenses having a combined refractive power of positive and a negative lens, and satisfies the condition (1). .
【0013】(1) 3<ft/fw<5 ただし、ftは望遠端の焦点距離、fwは広角端の焦点
距離である。第2の構成も、屈折力が正・負の2群構成
のズームレンズにおいて、少ないレンズ枚数で高い変倍
比を有するズームレンズを達成するために、正屈折力の
第1群を負レンズと正レンズで構成しているが、負屈折
力の第2群は合成屈折力が正となる2枚のレンズと負レ
ンズで構成されている。このように、絞り側に配置した
正レンズを2つの正レンズに分けることによって、最終
の負レンズで発生する広角端の軸外収差を良好に補正す
ることができる。
(1) 3 <ft / fw <5 where ft is the focal length at the telephoto end, and fw is the focal length at the wide-angle end. In the second configuration, in order to achieve a zoom lens having a high zoom ratio with a small number of lenses in a two-group zoom lens having positive and negative refractive powers, the first group having a positive refractive power is referred to as a negative lens. Although the second lens unit having a negative refractive power is composed of a positive lens, the second lens unit is composed of two lenses having a positive combined refractive power and a negative lens. As described above, by dividing the positive lens disposed on the diaphragm side into two positive lenses, off-axis aberration at the wide-angle end generated by the final negative lens can be favorably corrected.
【0014】本発明のズームレンズの第3の構成は、物
体側より順に、正屈折力の第1群と、負屈折力の第2群
と、負屈折力の第3群で構成され、条件(2)を満足す
るものである。
A third configuration of the zoom lens according to the present invention comprises, in order from the object side, a first group having a positive refractive power, a second group having a negative refractive power, and a third group having a negative refractive power. It satisfies (2).
【0015】(2) 2.5<ft/fw<5.5 ただし、ftは望遠端の焦点距離、fwは広角端の焦点
距離である。前述の第1の構成及び第2の構成では正屈
折力の第1群、負屈折力の第2群の2群構成であったの
に対して、第3の構成では第2群をさらに二つの群に分
け、屈折力が正・負・負である3群構成とすることによ
り、望遠端のレンズ全長が短く、よりコンパクトなズー
ムレンズを達成している。望遠端の全長を短くするには
各群のパワーを強める必要があるが、各群のパワーを強
めると、特に、負レンズ(あるいは負のレンズ群)で発
生する像面湾曲が大きくなり、像面が物体から遠ざかる
方向へ倒れてしまう。そこで、本発明では屈折力が正・
負・負の3群構成とし負屈折力を有するレンズ群のパワ
ーを分散させることで、像面湾曲の発生量を小さく抑え
るようにしている。
(2) 2.5 <ft / fw <5.5 where ft is the focal length at the telephoto end and fw is the focal length at the wide-angle end. In the above-described first and second configurations, the first unit has a positive refractive power, and the second unit has a negative refractive power. In the third configuration, the second unit is further divided into two. The zoom lens is divided into three groups and has a positive / negative / negative refractive power, so that the total length of the lens at the telephoto end is short and a more compact zoom lens is achieved. In order to shorten the total length at the telephoto end, it is necessary to increase the power of each group. However, if the power of each group is increased, the field curvature generated by the negative lens (or the negative lens group) increases, and The surface falls in the direction away from the object. Therefore, in the present invention, the refractive power is positive.
By dispersing the power of the lens unit having a negative refracting power with a negative and negative three-group configuration, the amount of curvature of field is reduced.
【0016】条件(2)は高い変倍比を有するズームレ
ンズを達成するための条件である。条件(2)の下限値
の2.5を超えると変倍比が小さくなる。また、上限値
の5.5を超えると収差補正が困難となり、良好な結像
性能を得ることができない。
The condition (2) is a condition for achieving a zoom lens having a high zoom ratio. If the lower limit of 2.5 of the condition (2) is exceeded, the zoom ratio will decrease. On the other hand, when the value exceeds the upper limit of 5.5, it becomes difficult to correct aberrations, so that good imaging performance cannot be obtained.
【0017】本発明のズームレンズの第4の構成は、物
体側より順に、正屈折力の第1群と、負屈折力の第2群
と、負屈折力の第3群で構成され、いずれの群も変倍時
に可動であり、前記正屈折力の第1群は負レンズと正レ
ンズで構成され、前記負屈折力の第2群は正レンズと負
レンズで構成され、前記負屈折力の第3群は負レンズ1
枚で構成されている。
A fourth configuration of the zoom lens according to the present invention comprises, in order from the object side, a first group having a positive refractive power, a second group having a negative refractive power, and a third group having a negative refractive power. Is also movable at the time of zooming, the first group of the positive refractive power is composed of a negative lens and a positive lens, the second group of the negative refractive power is composed of a positive lens and a negative lens, The third group is a negative lens 1
It is composed of sheets.
【0018】屈折力が正・負・負の3群構成において、
少ないレンズ枚数で高変倍なズームレンズを達成するに
は、物体側より順に負レンズと正レンズの第1群と、明
るさ絞りと、正レンズと負レンズの第2群と、負レンズ
の第3群で構成することが望ましい。そして、軸外収差
を良好に補正するために、第1群と第2群は絞りを挟ん
で対称なレンズ配置とすることが好ましい。また、屈折
力の弱い負レンズ1枚で第3群を構成することで、像面
湾曲を良好に補正することが可能となる。
In a three-group configuration having positive, negative and negative refractive powers,
In order to achieve a high zoom ratio with a small number of lenses, a first lens unit of a negative lens and a positive lens, an aperture stop, a second lens unit of a positive lens and a negative lens, and a negative lens It is desirable to constitute the third group. In order to satisfactorily correct off-axis aberrations, it is preferable that the first and second units have a lens arrangement symmetrical with respect to the stop. In addition, by configuring the third unit with one negative lens having a low refractive power, it is possible to satisfactorily correct field curvature.
【0019】本発明のズームレンズの第5の構成は、物
体側より順に、正屈折力の第1群と、明るさ絞りと、負
屈折力の第2群で構成され、第1群は負レンズと正レン
ズで構成され、第2群は正レンズと負レンズで構成さ
れ、第2群を像面側に移動させることによって至近物体
へのフォーカシングを行なうものである。
A fifth configuration of the zoom lens according to the present invention comprises, in order from the object side, a first unit having a positive refractive power, a diaphragm, and a second unit having a negative refractive power. The second group is composed of a lens and a positive lens, and the second group is composed of a positive lens and a negative lens. The second group is moved to the image plane side to perform focusing on a close object.
【0020】前述の如く、屈折力が正・負の2群構成に
おいて、少ないレンズ枚数で高変倍なズームレンズを達
成するには、物体側より順に負レンズと正レンズの第1
群と、明るさ絞りと、正レンズと負レンズの第2群で構
成することが望ましい。そして、特にコンパクトなズー
ムレンズを達成するには、第2群を像面側に移動させる
事で至近物体へのフォーカシングを行なうことが望まし
い。仮に第1群を移動させてフォーカシングを行うと、
至近物体へのフォーカシングは第1群を物体側に繰り出
すことになるため、特に、望遠端の全長が長くなってし
まう。これに対して、第2群をフォーカシングに用いれ
ば望遠端の全長が長くならず、また、フォーカシングの
際の収差変動が小さいというメリットも有する。
As described above, in a two-unit configuration having positive and negative refractive powers, in order to achieve a high zoom ratio zoom lens with a small number of lenses, the first lens of the negative lens and the positive lens must be arranged in order from the object side.
It is desirable that the optical system be composed of a group, a brightness stop, and a second group of a positive lens and a negative lens. In order to achieve a particularly compact zoom lens, it is desirable to perform focusing on a close object by moving the second unit to the image plane side. If focusing is performed by moving the first lens group,
In focusing on a close object, the first lens unit is moved to the object side, so that the total length at the telephoto end becomes particularly long. On the other hand, if the second lens unit is used for focusing, the total length of the telephoto end does not become longer, and there is also an advantage that aberration variation during focusing is small.
【0021】本発明のズームレンズの第6の構成は、物
体側より順に正屈折力の第1群と、明るさ絞りと、負屈
折力の第2群で構成され、第1群は負レンズと正レンズ
で構成され、第2群は正レンズと負レンズで構成され、
第1群の正レンズが両面非球面であるものである。
A sixth configuration of the zoom lens according to the present invention comprises, in order from the object side, a first group having a positive refractive power, a stop, and a second group having a negative refractive power. The first group is a negative lens. And the second lens unit is composed of a positive lens and a negative lens.
The positive lens of the first group has two aspheric surfaces.
【0022】屈折力が正・負の2群構成において、変倍
比の大きなズームレンズを達成するには、特に望遠端で
発生する負の球面収差を良好に補正する必要がある。そ
こで、第1群の正レンズは両面非球面の形状であること
が望ましい。この正レンズは明るさ絞りに近く配置され
ているため、球面収差の補正効果が大きい。また、両面
非球面とすることで製造バラツキに強いメリットも有す
る。また、少なくとも片側の面は、光軸から周辺に行く
に従い正の屈折力が弱くなるような非球面形状であるこ
とが望ましい。この様な形状であれば、特に望遠端で発
生する負の球面収差を良好に補正することが可能であ
る。なお、上記第1の構成乃至第5の構成において、第
1群に少なくとも1つの非球面を用いることで収差を良
好に補正することができる。
In order to achieve a zoom lens having a large zoom ratio in a two-unit configuration having positive and negative refractive powers, it is necessary to satisfactorily correct negative spherical aberration particularly occurring at the telephoto end. Therefore, it is desirable that the positive lens of the first group has an aspheric surface on both sides. Since this positive lens is arranged near the aperture stop, the effect of correcting spherical aberration is large. In addition, having both surfaces aspherical also has an advantage of being resistant to manufacturing variations. Further, it is desirable that at least one surface has an aspherical shape such that the positive refractive power becomes weaker from the optical axis toward the periphery. With such a shape, it is possible to favorably correct negative spherical aberration particularly occurring at the telephoto end. In the above-described first to fifth configurations, by using at least one aspheric surface for the first group, aberrations can be favorably corrected.
【0023】また、上記第1の構成乃至第6の構成にお
いて、望遠端の球面収差を良好に補正するには、望遠端
の全長を長くすることで各群のパワーを弱め、特に、第
1群で発生する球面収差を小さくすることが効果的であ
る。そこで、本発明のレンズ系では条件(3)を満足す
ることが望ましい。
In the first to sixth configurations, in order to favorably correct spherical aberration at the telephoto end, the power of each unit is weakened by increasing the total length at the telephoto end.
It is effective to reduce the spherical aberration generated in one group. Therefore, it is desirable that the lens system of the present invention satisfies the condition (3).
【0024】(3) 0.5<Lt/ft<1.0 ただし、Ltは望遠端のレンズ全長、ftは望遠端の焦
点距離である。条件(3)は球面収差が良好に補正でき
る範囲を望遠端の全長(最も物体側にあるレンズ第1面
から像面までの長さ)を用いて規定したものである。下
限値の0.5を超えると各群のパワーが強くなり、望遠
端の球面収差を良好に補正することが困難となる。ま
た、上限値の1.0を超えると、ズームレンズ全長が長
くなり、コンパクトなレンズ系を達成することが困難と
なる。なお、レンズ系の球面収差をより良好に補正し、
且つコンパクトするためは、下記の条件(3−1)を満
足することが望ましい。
(3) 0.5 <Lt / ft <1.0 where Lt is the total length of the lens at the telephoto end, and ft is the focal length at the telephoto end. Condition (3) defines the range in which spherical aberration can be favorably corrected using the entire length at the telephoto end (the length from the first lens surface closest to the object side to the image plane). If the lower limit of 0.5 is exceeded, the power of each lens unit becomes strong, making it difficult to satisfactorily correct spherical aberration at the telephoto end. On the other hand, when the value exceeds the upper limit of 1.0, the total length of the zoom lens becomes long, and it is difficult to achieve a compact lens system. In addition, the spherical aberration of the lens system is better corrected,
In addition, for compactness, it is desirable to satisfy the following condition (3-1).
【0025】(3−1) 0.6<Lt/ft<0.9 なお、2群ズームレンズにおいて望遠端の球面収差を更
に良好に補正するには、下記の条件(3−2)を満足す
ることがより望ましい。
(3-1) 0.6 <Lt / ft <0.9 In order to better correct spherical aberration at the telephoto end in the two-unit zoom lens, the following condition (3-2) must be satisfied. It is more desirable to do.
【0026】(3−2) 0.78<Lt/ft<0.
9 また、3群ズームレンズにおいて、望遠端の球面収差を
更に良好に補正するには下記の条件(3−3)を満足す
ることが望ましい。
(3-2) 0.78 <Lt / ft <0.
9 In the three-unit zoom lens, it is preferable that the following condition (3-3) is satisfied in order to more effectively correct spherical aberration at the telephoto end.
【0027】(3−3) 0.65<Lt/ft<0.
78 また、上記第1の構成乃至第6の構成において、下記の
条件(4)を満足することが望ましい。
(3-3) 0.65 <Lt / ft <0.
78 In the first to sixth configurations, it is preferable that the following condition (4) is satisfied.
【0028】(4) 0.08<f1/ft<0.35 ここで、f1は第1群の焦点距離、ftは望遠端の焦点
距離である。条件(4)は収差を良好に補正するための
条件であり、下限値の0.08を超えると第1群の屈折
力が強くなり、特に望遠端の球面収差を良好に補正する
ことが困難となる。また、上限値の0.35を超えると
第1群の屈折力が弱くなり、特に望遠端の全長が長くな
るため好ましくない。なお、レンズ系の収差をより良好
に補正し、且つ望遠端の全長を短くするためは、下記の
条件(4−1)を満足することが望ましい。
(4) 0.08 <f1 / ft <0.35 where f1 is the focal length of the first lens unit, and ft is the focal length at the telephoto end. Condition (4) is a condition for favorably correcting aberrations. If the lower limit of 0.08 is exceeded, the refractive power of the first lens unit becomes strong, and it is particularly difficult to favorably correct spherical aberration at the telephoto end. Becomes On the other hand, when the value exceeds the upper limit of 0.35, the refractive power of the first lens unit becomes weak, and in particular, the total length at the telephoto end becomes longer. In order to better correct the aberration of the lens system and shorten the total length at the telephoto end, it is desirable to satisfy the following condition (4-1).
【0029】 (4−1) 0.12<f1/ft<0.25 また、上記第1、第2、第5、第6の構成において、下
記の条件(5)を満足することが望ましい。
(4-1) 0.12 <f1 / ft <0.25 In the first, second, fifth, and sixth configurations, it is preferable that the following condition (5) is satisfied.
【0030】(5) −0.3<f22/ft<−0.
05 ここで、f22は2群ズームレンズの第2群の焦点距
離、ftは望遠端の焦点距離である。
(5) -0.3 <f22 / ft <-0.
05 Here, f22 is the focal length of the second group of the two-unit zoom lens, and ft is the focal length at the telephoto end.
【0031】条件(5)は2群構成のズームレンズにお
いて収差を良好に補正するための条件である。下限値の
−0.3を超えると第2群の屈折力が弱くなり、特に望
遠端の全長が長くなるため好ましくない。また、上限値
の−0.05を超えると第2群の屈折力が強くなり、特
に望遠端の球面収差を良好に補正することが困難とな
る。なお、レンズ系の球面収差をより良好に補正し、且
つ望遠端の全長を短くするためは、下記の条件(5−
1)を満足することが望ましい。
Condition (5) is a condition for favorably correcting aberrations in a two-unit zoom lens. If the lower limit of -0.3 is exceeded, the refractive power of the second lens unit becomes weak, and in particular, the total length at the telephoto end becomes longer, which is not preferable. On the other hand, when the value exceeds the upper limit of -0.05, the refractive power of the second unit becomes strong, and it becomes difficult to satisfactorily correct spherical aberration particularly at the telephoto end. In order to better correct the spherical aberration of the lens system and shorten the total length at the telephoto end, the following condition (5-
It is desirable to satisfy 1).
【0032】 (5−1) −0.22<f22/ft<−0.08 また、上記第3、第4の構成においてコンパクトなズー
ムレンズを達成するには、第3群を像面側に移動させる
ことにより至近物体へのフォーカシングを行なうことが
望ましい。なお、第3群だけでなくそれ以外の群を移動
させることにより、至近物体へのフォーカシングを行な
うことも可能であるが、コンパクトなズームレンズとす
るには第3群のみを像面側に移動させることが望まし
い。
(5-1) −0.22 <f22 / ft <−0.08 In order to achieve a compact zoom lens in the third and fourth configurations, the third lens unit must be placed on the image plane side. It is desirable to perform focusing on a nearby object by moving the object. It is also possible to focus on a close object by moving not only the third lens unit but also the other lens units. However, for a compact zoom lens, only the third lens unit is moved to the image plane side. It is desirable to make it.
【0033】また、上記の第1の構成乃至第6の構成に
おいて、十分な設計性能を出し、なお且つ製作時にも性
能を維持できるようにするには、以下の条件(6)を満
足することが望ましい。
In the first to sixth configurations described above, the following condition (6) must be satisfied in order to obtain sufficient design performance and to maintain performance during manufacturing. Is desirable.
【0034】(6) 4<Lt/IH<8 ただし、Ltは望遠端のレンズ全長、IHは像高であ
る。図1は本発明のズームレンズの概念図である。図
中、1は本発明のズームレンズ、2はズームレンズ1の
鏡枠、3は軸外主光線、4は光軸である。図1は望遠端
におけるレンズの様子を示したものである。望遠端では
ズームレンズ最終面から像面までの距離を長くとる必要
があるため、レンズは図1に示すようにズームレンズの
鏡枠の先端(物体側)に位置することになる。この場
合、鏡枠の先端側に荷重が集中することになるため鏡枠
に変形が生じ易い。すなわち、像高IHに対して望遠端
のレンズ全長Ltが長くなればなるほど、ズームレンズ
1の重みによる鏡枠が変形する割合が増えるので、良好
な結像性能が得られにくくなる。変形を抑えるためには
像高IHに対して望遠端におけるレンズ全長Ltを短す
れば良いが、望遠端のレンズ全長Ltを短くするために
は各群の屈折力を強くしなければならない。そうする
と、今度は少ないレンズ枚数で収差を良好に補正するこ
とが困難となる。
(6) 4 <Lt / IH <8 where Lt is the total length of the lens at the telephoto end, and IH is the image height. FIG. 1 is a conceptual diagram of a zoom lens according to the present invention. In the figure, 1 is a zoom lens of the present invention, 2 is a mirror frame of the zoom lens 1, 3 is an off-axis principal ray, and 4 is an optical axis. FIG. 1 shows the state of the lens at the telephoto end. At the telephoto end, it is necessary to increase the distance from the final surface of the zoom lens to the image plane. Therefore, the lens is located at the tip (object side) of the lens frame of the zoom lens as shown in FIG. In this case, since the load is concentrated on the distal end side of the lens frame, the lens frame is easily deformed. That is, as the total lens length Lt at the telephoto end becomes longer with respect to the image height IH, the rate at which the lens frame is deformed by the weight of the zoom lens 1 increases, so that it becomes difficult to obtain good imaging performance. In order to suppress the deformation, the total lens length Lt at the telephoto end may be reduced with respect to the image height IH. However, in order to reduce the total lens length Lt at the telephoto end, the refractive power of each unit must be increased. Then, it becomes difficult to satisfactorily correct the aberration with a small number of lenses.
【0035】そこで、本発明の正負2群、あるいは正負
負3群ズームレンズにおいては条件(6)を満足するこ
とが望ましい。下限値の4を超えてしまうと少ないレン
ズ枚数で収差を良好に補正することが困難となる。ま
た、上限値の8を超えると鏡枠の変形が大きくなり、良
好な結像性能を得られなくなる。なお、鏡枠の変形を抑
えつつ少ないレンズ枚数で構成するためには、条件(6
−1)を満足することが望ましい。
Therefore, it is desirable that the positive / negative two-group or the positive / negative / negative three-group zoom lens of the present invention satisfies the condition (6). If the lower limit of 4 is exceeded, it becomes difficult to satisfactorily correct aberrations with a small number of lenses. On the other hand, when the value exceeds the upper limit of 8, the deformation of the lens frame becomes large, and good imaging performance cannot be obtained. In order to configure the lens frame with a small number of lenses while suppressing deformation of the lens barrel, the condition (6)
It is desirable to satisfy -1).
【0036】(6−1) 4.8<Lt/IH<7.2 また、上記の第1の構成乃至第6の構成において、下記
の条件(7)を満足することが望ましい。
(6-1) 4.8 <Lt / IH <7.2 Further, in the above-described first to sixth configurations, it is desirable that the following condition (7) is satisfied.
【0037】(7) 0.8<f1/IH<1.8 ただし、f1は第1群の焦点距離、IHは像高である。
条件(7)は収差を良好に補正するための条件である。
下限値の0.8を超えると第1群の屈折力が強くなり、
特に広角端の軸外収差や望遠端の球面収差を良好に補正
することが困難となる。また、上限値の1.8を超える
と特に望遠端の全長が長くなるため好ましくない。な
お、広角端の軸外収差や望遠端の球面収差をより良好に
補正し、且つ望遠端の全長を短くするためは、下記の条
件(7−1)を満足することが望ましい。
(7) 0.8 <f1 / IH <1.8 where f1 is the focal length of the first lens unit and IH is the image height.
Condition (7) is a condition for favorably correcting aberration.
If the lower limit of 0.8 is exceeded, the refractive power of the first lens group will increase,
In particular, it becomes difficult to satisfactorily correct off-axis aberrations at the wide-angle end and spherical aberrations at the telephoto end. If the upper limit of 1.8 is exceeded, the total length at the telephoto end becomes particularly long, which is not preferable. In order to better correct off-axis aberrations at the wide-angle end and spherical aberrations at the telephoto end and to shorten the overall length at the telephoto end, it is desirable to satisfy the following condition (7-1).
【0038】(7−1) 1<f1/IH<1.5 また、上記第1、第2、第5、第6の構成において、下
記の条件(8)を満足することが望ましい。
(7-1) 1 <f1 / IH <1.5 In the first, second, fifth, and sixth configurations, it is preferable that the following condition (8) is satisfied.
【0039】(8) −1.5<f22/IH<−0.
5 ただし、f22は2群ズームレンズの第2群の焦点距
離、IHは像高である。条件(8)は収差を良好に補正
するための条件である。下限値の−1.5を超えると、
特に望遠短側の全長が長くなるため好ましくない。ま
た、上限値の−0.5を超えると第2群の屈折力が強く
なり、特に広角端の軸外収差を良好に補正することが困
難となる。なお、広角端の軸外収差を良好に補正し、且
つ望遠端の全長を短くするためは、下記の条件(8−
1)を満足することが望ましい。
(8) -1.5 <f22 / IH <-0.
5 where f22 is the focal length of the second group of the two-unit zoom lens, and IH is the image height. Condition (8) is a condition for favorably correcting aberration. When the lower limit of -1.5 is exceeded,
In particular, the total length on the short telephoto side is undesirably long. On the other hand, when the value exceeds the upper limit of -0.5, the refractive power of the second lens unit becomes strong, and it becomes difficult to satisfactorily correct off-axis aberrations particularly at the wide-angle end. In order to favorably correct off-axis aberrations at the wide-angle end and to shorten the overall length at the telephoto end, the following condition (8-
It is desirable to satisfy 1).
【0040】(8−1) −1.3<f22/IH<−
0.8 また、上記第3、第4の構成において、下記の条件
(9)を満足することが望ましい。
(8-1) -1.3 <f22 / IH <-
0.8 In the third and fourth configurations, it is desirable that the following condition (9) is satisfied.
【0041】(9) −2.8<f23/IH<−1 ただし、f23は3群ズームレンズの第2群の焦点距
離、IHは像高である。条件(9)は収差を良好に補正
するための条件であり、上限を超えると第2群の屈折力
が強くなり、特に広角端の軸外収差を良好に補正するこ
とが困難となる。また、下限を超えると特に望遠端の全
長が長くなるため好ましくない。なお、広角端の軸外収
差を良好に補正し、且つ望遠端の全長を短くするため
は、下記の条件(9−1)を満足することが望ましい。
(9) -2.8 <f23 / IH <-1 where f23 is the focal length of the second group of the three-unit zoom lens, and IH is the image height. The condition (9) is a condition for favorably correcting aberration. If the upper limit of the condition (9) is exceeded, the refractive power of the second lens unit becomes strong, and it becomes difficult to favorably correct off-axis aberration particularly at the wide-angle end. On the other hand, exceeding the lower limit is not preferable because the total length at the telephoto end is particularly long. In order to favorably correct off-axis aberrations at the wide-angle end and shorten the overall length at the telephoto end, it is desirable to satisfy the following condition (9-1).
【0042】(9−1) −2.5<f23/IH<−
1.4 以下、実施例について説明する。 (実施例1)実施例1のズームレンズの断面図を図2
に、収差図を図14に示す。なお、収差図において、SA
は球面収差、ASは非点収差、DTは歪曲収差、CCは倍率の
色収差、TAは軸外横収差のことである。また、d線の波
長は587.56nm、C線の波長は656.27nm、F線の波長は486.
13nmである。これらの項目については、以下の実施例2
乃至実施例12においても同様である。
(9-1) −2.5 <f23 / IH <−
1.4 Examples will be described below. (Embodiment 1) A sectional view of the zoom lens of Embodiment 1 is shown in FIG.
FIG. 14 shows aberration diagrams. In the aberration diagram, SA
Denotes spherical aberration, AS denotes astigmatism, DT denotes distortion, CC denotes chromatic aberration of magnification, and TA denotes off-axis lateral aberration. The wavelength of the d line is 587.56 nm, the wavelength of the C line is 656.27 nm, and the wavelength of the F line is 486.
13 nm. These items are described in Example 2 below.
The same applies to the twelfth to twelfth embodiments.
【0043】実施例1はレンズ枚数が4枚と少ないなが
ら、焦点距離が38.9mmから127.3mmであって、変倍比が
3.27のズームレンズである。物体側より順に、正屈
折力の第1群と、負屈折力の第2群で構成されている。
第1群は物体側より順に、負レンズと正レンズで構成さ
れ、第2群は正レンズと負レンズで構成されている。ま
た、絞りは第1群と第2群の間に配置され、第1群と一
体になっている。
The first embodiment is a zoom lens having a focal length of 38.9 mm to 127.3 mm and a zoom ratio of 3.27 although the number of lenses is as small as four. In order from the object side, it is composed of a first group having a positive refractive power and a second group having a negative refractive power.
The first group includes, in order from the object side, a negative lens and a positive lens, and the second group includes a positive lens and a negative lens. The aperture is disposed between the first and second groups, and is integrated with the first group.
【0044】本実施例では、絞りを挟んで屈折力が対称
となるようなレンズ配置とすることで、特に広角端の軸
外収差を良好に補正している。また、第1群の負レンズ
は凹面を像側に向けたメニスカス形状、正レンズは両凸
形状、第2群の正レンズは両凸形状、負レンズは凹面を
物体側に向けたメニスカス形状となっている。なお、第
2群の正レンズは倍率の色収差を良好に補正するため、
高分散な光学素子であるPC(ホ゜リカーホ゛ネイト)を用いてい
る。
In the present embodiment, off-axis aberrations, especially at the wide-angle end, are favorably corrected by arranging lenses so that the refractive power is symmetrical with respect to the stop. The negative lens of the first group has a meniscus shape with the concave surface facing the image side, the positive lens has a biconvex shape, the positive lens of the second group has a biconvex shape, and the negative lens has a meniscus shape with the concave surface facing the object side. Has become. Note that the positive lens of the second group favorably corrects chromatic aberration of magnification.
A PC (polycarbonate) which is a high dispersion optical element is used.
【0045】また、非球面は第1群の負レンズの物体側
の面と正レンズの両面、及び第2群の正レンズの物体側
の面に用いられている。本実施例のズームレンズでは、
絞りよりも物体側に配置された比較的屈折力の強い正レ
ンズと、特に広角端での光線高が高くなる位置に配置さ
れた最も像側の負レンズとにおいて、軸外収差が大きく
発生する傾向にある。特に、コマ収差、歪曲収差の発生
量が大きい。そこで、第1群の負レンズに用いた非球面
は、負レンズの屈折力が周辺部で強くなるような形状と
し、これによりコマ収差や歪曲収差を良好に補正してい
る。また、第2群の正レンズに用いた非球面は、レンズ
の屈折力が周辺部で強くなるような形状とすることで同
様の効果を得ている。
The aspherical surfaces are used on the object side surface of the first group negative lens and on both surfaces of the positive lens, and on the object side surface of the second group positive lens. In the zoom lens of the present embodiment,
Large off-axis aberrations occur in the positive lens with relatively high refractive power located closer to the object side than the stop, and especially in the negative lens closest to the image located at the position where the ray height at the wide-angle end increases. There is a tendency. In particular, the amount of coma and distortion is large. Therefore, the aspherical surface used for the negative lens of the first group is shaped so that the refractive power of the negative lens becomes strong in the peripheral portion, and thereby, coma and distortion are satisfactorily corrected. The same effect is obtained by forming the aspherical surface used for the positive lens of the second group such that the refractive power of the lens becomes strong at the peripheral portion.
【0046】また、至近物体へのフォーカシングは第2
群を像側に移動させることによって行ない、望遠端のレ
ンズ全長を短くすることを実現している。なお、第1群
を物体側に移動させることで至近物体へのフォーカシン
グを行なうことも可能であるが、第2群を像側に移動さ
せた場合のように望遠端のレンズ全長を短くすることは
困難である。
Focusing on a close object is the second
By moving the group to the image side, the total length of the lens at the telephoto end is shortened. It is also possible to focus on a close object by moving the first unit to the object side. However, as in the case where the second unit is moved to the image side, the total length of the lens at the telephoto end should be shortened. It is difficult.
【0047】本実施例のズームレンズは条件(1)、
(3)、(3−1)、(3−2)、(4)、(4−
1)、(5)、(5−1)、(6)、(6−1)、
(7)、(7−1)、(8)、(8−1)を満足する。
The zoom lens according to the present embodiment satisfies the condition (1),
(3), (3-1), (3-2), (4), (4-
1), (5), (5-1), (6), (6-1),
(7), (7-1), (8) and (8-1) are satisfied.
【0048】また、本実施例のズームレンズは銀塩フィ
ルムなどのフィルムを用いた光学系に用いる事ができ
る。また、CCDやCMOSなどの撮像素子を用いた光
学系に適用することも可能である。
The zoom lens of this embodiment can be used for an optical system using a film such as a silver halide film. Further, the present invention can be applied to an optical system using an image sensor such as a CCD or a CMOS.
【0049】(実施例2)実施例2のズームレンズの断
面図を図3に、収差図を図15に示す。実施例2も実施
例1と同様に、レンズ枚数が4枚のズームレンズであ
る。焦点距離は39.2mmから150.4mmであって、変倍比は
3.84である。物体側より順に、正屈折力の第1群
と、負屈折力の第2群で構成されている。第1群は物体
側より順に、負レンズと正レンズで構成され、第2群は
正レンズと負レンズで構成されている。また、絞りは第
1群と第2群の間に配置され、第1群と一体になってい
る。
Example 2 FIG. 3 is a cross-sectional view of the zoom lens of Example 2, and FIG. 15 is an aberration diagram. The second embodiment is a zoom lens having four lenses as in the first embodiment. The focal length is 39.2 mm to 150.4 mm, and the zoom ratio is 3.84. In order from the object side, it is composed of a first group having a positive refractive power and a second group having a negative refractive power. The first group includes, in order from the object side, a negative lens and a positive lens, and the second group includes a positive lens and a negative lens. The aperture is disposed between the first and second groups, and is integrated with the first group.
【0050】本実施例も、絞りを挟んで屈折力が対称と
なるようなレンズ配置とすることで、特に広角端の軸外
収差を良好に補正している。また、第1群の負レンズは
凹面を像側に向けたメニスカス形状、正レンズは両凸形
状、第2群の正レンズは両凸形状、負レンズは凹面を物
体側に向けたメニスカス形状となっている。なお、第2
群の正レンズは倍率の色収差を良好に補正するため、高
分散な光学素子であるPC(ホ゜リカーホ゛ネイト)を用いてい
る。
Also in this embodiment, the off-axis aberration at the wide-angle end is particularly well corrected by arranging the lenses such that the refractive power is symmetrical with respect to the stop. The negative lens of the first group has a meniscus shape with the concave surface facing the image side, the positive lens has a biconvex shape, the positive lens of the second group has a biconvex shape, and the negative lens has a meniscus shape with the concave surface facing the object side. Has become. The second
The positive lens of the group uses a PC (polycarbonate) which is a high-dispersion optical element in order to satisfactorily correct chromatic aberration of magnification.
【0051】非球面は第1群の負レンズの物体側の面と
正レンズの両面、及び第2群の正レンズの物体側の面に
用いられている。また、至近物体へのフォーカシングは
第2群を像側に移動させることによって行ない、望遠端
のレンズ全長を短くすることを実現している。なお、第
1群を物体側に移動させることで至近物体へのフォーカ
シングを行なうことも可能であるが、第2群を像側に移
動させた場合のように望遠端のレンズ全長を短くするこ
とは困難である。
The aspherical surfaces are used on the object side surface of the first group negative lens and both surfaces of the positive lens, and on the object side surface of the second group positive lens. Focusing on a close object is performed by moving the second unit to the image side, thereby realizing a reduction in the overall length of the lens at the telephoto end. It is also possible to focus on a close object by moving the first unit to the object side. However, as in the case where the second unit is moved to the image side, the total length of the lens at the telephoto end should be shortened. It is difficult.
【0052】本実施例のズームレンズも条件(1)、
(3)、(3−1)、(3−2)、(4)、(4−
1)、(5)、(5−1)、(6)、(6−1)、
(7)、(7−1)、(8)、(8−1)を満足する。 (実施例3)実施例3のズームレンズの断面図を図4
に、収差図を図16に示す。実施例3も実施例1と同様
に、レンズ枚数が4枚のズームレンズである。焦点距離
は32.9mmから154mmであって、変倍比は4.68であ
る。物体側より順に、正の屈折力の第1群と、負屈折力
の第2群で構成されている。第1群は物体側より順に、
負レンズと正レンズで構成され、第2群は正レンズと負
レンズで構成されている。また、絞りは第1群と第2群
の間に配置され、第1群と一体になっている。
The zoom lens according to the present embodiment also satisfies the condition (1),
(3), (3-1), (3-2), (4), (4-
1), (5), (5-1), (6), (6-1),
(7), (7-1), (8) and (8-1) are satisfied. (Embodiment 3) A sectional view of a zoom lens according to Embodiment 3 is shown in FIG.
FIG. 16 shows aberration diagrams. The third embodiment is a zoom lens having four lenses as in the first embodiment. The focal length is from 32.9 mm to 154 mm, and the zoom ratio is 4.68. In order from the object side, it is composed of a first group having a positive refractive power and a second group having a negative refractive power. The first group, in order from the object side,
The second lens unit includes a negative lens and a positive lens, and the second unit includes a positive lens and a negative lens. The aperture is disposed between the first and second groups, and is integrated with the first group.
【0053】本実施例も、絞りを挟んで屈折力が対称と
なるようなレンズ配置とすることで、特に広角端の軸外
収差を良好に補正している。また、第1群の負レンズは
両凹形状、正レンズは両凸形状、第2群の正レンズは凸
面を像側に向けたメニスカス形状、負レンズは凹面を物
体側に向けたメニスカス形状となっている。なお、第2
群の正レンズは倍率の色収差を良好に補正するため、高
分散な光学素子であるPC(ホ゜リカーホ゛ネイト)を用いてい
る。
Also in this embodiment, the off-axis aberration at the wide-angle end is particularly well corrected by arranging the lenses such that the refractive power is symmetrical with respect to the stop. The negative lens of the first group has a biconcave shape, the positive lens has a biconvex shape, the positive lens of the second group has a meniscus shape with the convex surface facing the image side, and the negative lens has a meniscus shape with the concave surface facing the object side. Has become. The second
The positive lens of the group uses a PC (polycarbonate) which is a high-dispersion optical element in order to satisfactorily correct chromatic aberration of magnification.
【0054】非球面は第1群の負レンズの物体側の面と
正レンズの両面、及び第2群の正レンズの物体側の面と
負レンズの物体側の面に用いられている。また、至近物
体へのフォーカシングは第2群を像側に移動させること
によって行ない、望遠端のレンズ全長を短くすることを
実現している。なお、第1群を物体側に移動させること
で至近物体へのフォーカシングを行なうことも可能であ
るが、第2群を像側に移動させた場合のように望遠端の
レンズ全長を短くすることは困難である。
The aspherical surface is used for the object side surface of the negative lens of the first group and both surfaces of the positive lens, and the object side surface of the positive lens of the second group and the object side surface of the negative lens. Focusing on a close object is performed by moving the second unit to the image side, thereby realizing a reduction in the overall length of the lens at the telephoto end. It is also possible to focus on a close object by moving the first unit to the object side. However, as in the case where the second unit is moved to the image side, the total length of the lens at the telephoto end should be shortened. It is difficult.
【0055】本実施例のズームレンズも条件(1)、
(3)、(3−1)、(3−2)、(4)、(4−
1)、(5)、(5−1)、(6)、(6−1)、
(7)、(7−1)、(8)、(8−1)を満足する。 (実施例4)実施例4のズームレンズの断面図を図5
に、収差図を図17に示す。実施例4も実施例1と同様
に、レンズ枚数が4枚のズームレンズである。焦点距離
は37.8mmから180.5mmであって、変倍比は4.78であ
る。物体側より順に、正屈折力の第1群と、負屈折力の
第2群で構成されている。第1群は物体側より順に、負
レンズと正レンズで構成され、第2群は正レンズと負レ
ンズで構成されている。また、絞りは第1群と第2群の
間に配置され、第1群と一体になっている。
The zoom lens of the present embodiment also has the condition (1),
(3), (3-1), (3-2), (4), (4-
1), (5), (5-1), (6), (6-1),
(7), (7-1), (8) and (8-1) are satisfied. Embodiment 4 FIG. 5 is a sectional view of a zoom lens according to Embodiment 4.
FIG. 17 shows aberration diagrams. The fourth embodiment is also a zoom lens having four lenses, as in the first embodiment. The focal length is from 37.8 mm to 180.5 mm, and the zoom ratio is 4.78. In order from the object side, it is composed of a first group having a positive refractive power and a second group having a negative refractive power. The first group includes, in order from the object side, a negative lens and a positive lens, and the second group includes a positive lens and a negative lens. The aperture is disposed between the first and second groups, and is integrated with the first group.
【0056】本実施例も、絞りを挟んで屈折力が対称と
なるようなレンズ配置とすることで、特に広角端の軸外
収差を良好に補正している。また、第1群の負レンズは
凹面を像側に向けたメニスカス形状、正レンズは両凸形
状、第2群の正レンズは両凸形状、負レンズは凹面を物
体側に向けたメニスカス形状となっている。なお、第2
群の正レンズは倍率の色収差を良好に補正するため、高
分散な光学素子であるPC(ホ゜リカーホ゛ネイト)を用いてい
る。
Also in this embodiment, the off-axis aberration at the wide-angle end is particularly well corrected by arranging the lenses such that the refractive power is symmetrical with respect to the stop. The negative lens of the first group has a meniscus shape with the concave surface facing the image side, the positive lens has a biconvex shape, the positive lens of the second group has a biconvex shape, and the negative lens has a meniscus shape with the concave surface facing the object side. Has become. The second
The positive lens of the group uses a PC (polycarbonate) which is a high-dispersion optical element in order to satisfactorily correct chromatic aberration of magnification.
【0057】非球面は第1群の負レンズの物体側の面と
正レンズの像側の面、及び第2群の正レンズの物体側の
面に用いている。また、第2群を像側に移動させる事で
至近物体へのフォーカシングを行ない、望遠端のレンズ
全長を短くすることが可能になっている。なお、第1群
を物体側に移動させることで至近物体へのフォーカシン
グを行なうことも可能であるが、第2群を像側に移動さ
せた場合のように望遠端のレンズ全長を短くすることは
困難である。
The aspherical surface is used for the object-side surface of the negative lens of the first group and the image-side surface of the positive lens, and the object-side surface of the positive lens of the second group. In addition, by moving the second unit to the image side, focusing on a close object is performed, and the total length of the lens at the telephoto end can be reduced. It is also possible to focus on a close object by moving the first unit to the object side. However, as in the case where the second unit is moved to the image side, the total length of the lens at the telephoto end should be shortened. It is difficult.
【0058】本実施例のズームレンズも条件(1)、
(3)、(3−1)、(3−2)、(4)、(4−
1)、(5)、(5−1)、(6)、(6−1)、
(7)、(7−1)、(8)、(8−1)を満足する。
The zoom lens of the present embodiment also satisfies the condition (1),
(3), (3-1), (3-2), (4), (4-
1), (5), (5-1), (6), (6-1),
(7), (7-1), (8) and (8-1) are satisfied.
【0059】(実施例5)実施例5のズームレンズの断
面図を図6に、収差図を図18に示す。実施例5も実施
例1と同様に、レンズ枚数が4枚のズームレンズであ
る。焦点距離は39.2mmから151.3mmであって、変倍比は
3.86である。物体側より順に、正屈折力の第1群
と、負屈折力の第2群で構成されている。第1群は物体
側より順に、負レンズと正レンズで構成され、第2群は
正レンズと負レンズで構成されている。また、絞りは第
1群と第2群の間に配置され、第1群と一体になってい
る。
(Embodiment 5) A sectional view of the zoom lens of Embodiment 5 is shown in FIG. 6, and an aberration diagram is shown in FIG. The fifth embodiment is a zoom lens having four lenses as in the first embodiment. The focal length is 39.2 mm to 151.3 mm, and the zoom ratio is 3.86. In order from the object side, it is composed of a first group having a positive refractive power and a second group having a negative refractive power. The first group includes, in order from the object side, a negative lens and a positive lens, and the second group includes a positive lens and a negative lens. The aperture is disposed between the first and second groups, and is integrated with the first group.
【0060】本実施例も、絞りを挟んで屈折力が対称と
なるようなレンズ配置とすることで、特に広角端の軸外
収差を良好に補正している。また、第1群の負レンズは
凹面を像側に向けたメニスカス形状、正レンズは両凸形
状、第2群の正レンズは凹面を物体側に向けたメニスカ
ス形状、負レンズは凹面を物体側に向けたメニスカス形
状となっている。本実施例のレンズにはPC(ホ゜リカーホ゛ネ
イト)は使用されていない。
Also in this embodiment, the off-axis aberration at the wide-angle end is particularly well corrected by arranging the lenses such that the refractive power is symmetrical with respect to the stop. The negative lens in the first group has a meniscus shape with the concave surface facing the image side, the positive lens has a biconvex shape, the positive lens in the second group has a meniscus shape with the concave surface facing the object side, and the negative lens has a concave surface facing the object side. It has a meniscus shape toward. No PC (polycarbonate) is used in the lens of this embodiment.
【0061】非球面は第1群の負レンズの物体側の面と
正レンズの両面、及び第2群の正レンズの物体側の面に
用いている。また、第2群を像側に移動させる事で至近
物体へのフォーカシングを行ない、望遠端のレンズ全長
を短くすることが可能になっている。なお、第1群を物
体側に移動させることで至近物体へのフォーカシングを
行なうことも可能であるが、第2群を像側に移動させた
場合のように望遠端のレンズ全長を短くすることは困難
である。
The aspheric surface is used for the object side surface of the first group negative lens and both surfaces of the positive lens, and the object side surface of the second group positive lens. In addition, by moving the second unit to the image side, focusing on a close object is performed, and the total length of the lens at the telephoto end can be reduced. It is also possible to focus on a close object by moving the first unit to the object side. However, as in the case where the second unit is moved to the image side, the total length of the lens at the telephoto end should be shortened. It is difficult.
【0062】本実施例のズームレンズも条件(1)、
(3)、(3−1)、(3−2)、(4)、(4−
1)、(5)、(5−1)、(6)、(6−1)、
(7)、(7−1)、(8)、(8−1)を満足する。
The zoom lens according to the present embodiment also satisfies the condition (1),
(3), (3-1), (3-2), (4), (4-
1), (5), (5-1), (6), (6-1),
(7), (7-1), (8) and (8-1) are satisfied.
【0063】(実施例6)実施例6のズームレンズの断
面図を図7に、収差図を図19に示す。実施例6はレン
ズ枚数が5枚のズームレンズである。焦点距離は39.0mm
から150.5mmであって、変倍比は3.86である。物体
側より順に、正屈折力の第1群と、負の屈折力の第2群で
構成されている。第1群は物体側より順に、負レンズと
正レンズで構成され、第2群は正レンズと正レンズと負
レンズで構成されている。また、絞りは第1群と第2群
の間に配置され、第1群と一体になっている。
(Embodiment 6) FIG. 7 is a sectional view of the zoom lens according to Embodiment 6, and FIG. 19 is an aberration diagram. Example 6 is a zoom lens having five lenses. Focal length 39.0mm
From 150.5 mm, and the zoom ratio is 3.86. In order from the object side, it is composed of a first group having a positive refractive power and a second group having a negative refractive power. The first group includes, in order from the object side, a negative lens and a positive lens, and the second group includes a positive lens, a positive lens, and a negative lens. The aperture is disposed between the first and second groups, and is integrated with the first group.
【0064】実施例1では第2群の正レンズ成分を1つ
のレンズで構成しているが、本実施例のズームレンズ
は、第2群の正レンズ成分を2つのレンズで構成してお
り、この点を特徴としている。実施例1では第2群の正
レンズにPC(ホ゜リカーホ゛ネイト)が用いられている。しか
し、PCは複屈折が発生しやすく、この結果、結像性能
を劣化させるという短所も有している。そこで、本実施
例では第2群の正レンズを2枚の正レンズで構成し、P
Cを用いた一方の正レンズの厚みを薄くすることで複屈
折の影響を小さくしている。
In the first embodiment, the positive lens component of the second group is composed of one lens. However, in the zoom lens of the present embodiment, the positive lens component of the second group is composed of two lenses. This is the feature. In the first embodiment, a PC (Polycarbonate) is used for the positive lens of the second group. However, PC also has a disadvantage that birefringence is likely to occur, and as a result, imaging performance is deteriorated. Therefore, in the present embodiment, the positive lens of the second group is constituted by two positive lenses, and P
The influence of birefringence is reduced by reducing the thickness of one positive lens using C.
【0065】また、第1群の負レンズは凹面を像側に向
けたメニスカス形状、正レンズは両凸形状、第2群の第
1の正レンズは凹面を像側に向けたメニスカス形状、第
2の正レンズは両凸形状、負レンズは凹面を物体側に向
けたメニスカス形状となっている。
The negative lens of the first group has a meniscus shape with the concave surface facing the image side, the positive lens has a biconvex shape, and the negative lens of the second group has
The first positive lens has a meniscus shape with the concave surface facing the image side, the second positive lens has a biconvex shape, and the negative lens has a meniscus shape with the concave surface facing the object side.
【0066】非球面は第1群の負レンズの物体側の面と
正レンズの両面、及び第2群の第1の正レンズの物体側
の面に用いている。また、第2群を像側に移動させる事
で至近物体へのフォーカシングを行ない、望遠端のレン
ズ全長を短くすることが可能になっている。なお、第1
群を物体側に移動させることで至近物体へのフォーカシ
ングを行なうことも可能であるが、第2群を像側に移動
させた場合のように望遠端のレンズ全長を短くすること
は困難である。
The aspheric surface is used for the object-side surface of the negative lens of the first group and both surfaces of the positive lens, and for the object-side surface of the first positive lens of the second group. In addition, by moving the second unit to the image side, focusing on a close object is performed, and the total length of the lens at the telephoto end can be reduced. The first
Although it is possible to focus on a close object by moving the group to the object side, it is difficult to shorten the total length of the lens at the telephoto end as in the case where the second group is moved to the image side. .
【0067】本実施例のズームレンズも条件(1)、
(3)、(3−1)、(3−2)、(4)、(4−
1)、(5)、(5−1)、(6)、(6−1)、
(7)、(7−1)、(8)、(8−1)を満足する。
The zoom lens according to the present embodiment also has the condition (1),
(3), (3-1), (3-2), (4), (4-
1), (5), (5-1), (6), (6-1),
(7), (7-1), (8) and (8-1) are satisfied.
【0068】(実施例7)実施例7のズームレンズの断
面図を図8に、収差図を図20に示す。実施例7も実施
例6と同様にレンズ枚数が5枚のズームレンズである。
焦点距離は38.9mmから151.4mmであって、変倍比は3.
89である。物体側より順に、正屈折力の第1群と、負
屈折力の第2群で構成されている。第1群は物体側より
順に、負レンズと正レンズで構成され、第2群は負レン
ズと正レンズと負レンズで構成されている。また、絞り
は第1群と第2群の間に配置され、第1群と一体になっ
ている。
(Embodiment 7) FIG. 8 is a sectional view of the zoom lens according to Embodiment 7, and FIG. Embodiment 7 is a zoom lens having five lenses as in Embodiment 6.
The focal length is 38.9mm to 151.4mm, and the zoom ratio is 3.
89. In order from the object side, it is composed of a first group having a positive refractive power and a second group having a negative refractive power. The first group includes, in order from the object side, a negative lens and a positive lens, and the second group includes a negative lens, a positive lens, and a negative lens. The aperture is disposed between the first and second groups, and is integrated with the first group.
【0069】本実施例も第2群の正レンズ成分を2つの
レンズで構成しているが、第6実施例とは異なり、負レ
ンズと正レンズで第2群の正レンズ成分を構成してい
る。実施例6と同様に負レンズの厚みが薄くなっている
ため、複屈折の影響を小さく抑えることができる。
In this embodiment, the positive lens component of the second group is composed of two lenses. However, unlike the sixth embodiment, the positive lens component of the second group is composed of a negative lens and a positive lens. I have. Since the thickness of the negative lens is small as in the case of the sixth embodiment, the influence of birefringence can be suppressed.
【0070】また、第1群の負レンズは凹面を像側に向
けたメニスカス形状、正レンズは両凸形状、第2群の負
レンズは両凹形状、正レンズは両凸形状、負レンズは凹
面を物体側に向けたメニスカス形状となっている。
The negative lens of the first group has a meniscus shape with the concave surface facing the image side, the positive lens has a biconvex shape, the negative lens of the second group has a biconcave shape, the positive lens has a biconvex shape, and the negative lens has a It has a meniscus shape with the concave surface facing the object side.
【0071】非球面は第1群の負レンズの物体側の面と
正レンズの両面、及び第2群の両凹負レンズの物体側の
面に用いている。また、第2群を像側に移動させる事で
至近物体へのフォーカシングを行ない、望遠端のレンズ
全長を短くすることが可能になっている。なお、第1群
を物体側に移動させることで至近物体へのフォーカシン
グを行なうことも可能であるが、第2群を像側に移動さ
せた場合のように望遠端のレンズ全長を短くすることは
困難である。
The aspheric surfaces are used on the object side surface of the first group negative lens and on both surfaces of the positive lens, and on the object side surface of the second group biconcave negative lens. In addition, by moving the second unit to the image side, focusing on a close object is performed, and the total length of the lens at the telephoto end can be reduced. It is also possible to focus on a close object by moving the first unit to the object side. However, as in the case where the second unit is moved to the image side, the total length of the lens at the telephoto end should be shortened. It is difficult.
【0072】本実施例のズームレンズも条件(1)、
(3)、(3−1)、(3−2)、(4)、(4−
1)、(5)、(5−1)、(6)、(6−1)、
(7)、(7−1)、(8)、(8−1)を満足する。
The zoom lens according to the present embodiment also has the condition (1),
(3), (3-1), (3-2), (4), (4-
1), (5), (5-1), (6), (6-1),
(7), (7-1), (8) and (8-1) are satisfied.
【0073】(実施例8)実施例8のズームレンズの断
面図を図9に、収差図を図21に示す。実施例8も実施
例6と同様にレンズ枚数が5枚のズームレンズである。
焦点距離は39.3mmから150.4mmであって、変倍比は3.
83である。物体側より順に、正屈折力の第1群と、負
屈折力の第2群で構成されている。第1群は物体側より
順に、負レンズと正レンズで構成され、第2群は正レン
ズと負レンズと負レンズで構成されている。また、絞り
は第1群と第2群の間に配置され、第1群と一体になっ
ている。本実施例も第2群の正レンズ成分を正レンズと
負レンズの2つのレンズで構成し、実施例6とほぼ同様
の効果を得ている。
(Embodiment 8) FIG. 9 is a sectional view of the zoom lens according to Embodiment 8, and FIG. 21 is an aberration diagram. Embodiment 8 is also a zoom lens having five lenses as in Embodiment 6.
The focal length is 39.3mm to 150.4mm, and the zoom ratio is 3.
83. In order from the object side, it is composed of a first group having a positive refractive power and a second group having a negative refractive power. The first group includes, in order from the object side, a negative lens and a positive lens, and the second group includes a positive lens, a negative lens, and a negative lens. The aperture is disposed between the first and second groups, and is integrated with the first group. In this embodiment, the positive lens component of the second group is composed of two lenses, that is, a positive lens and a negative lens, and substantially the same effects as in the sixth embodiment are obtained.
【0074】また、第1群の負レンズは凹面を像側に向
けたメニスカス形状、正レンズは両凸形状、第2群の正
レンズは両凸形状、負レンズは凹面を物体側に向けたメ
ニスカス形状、負レンズは凹面を物体側に向けたメニス
カス形状となっている。
The negative lens of the first group has a meniscus shape with the concave surface facing the image side, the positive lens has a biconvex shape, the positive lens of the second group has a biconvex shape, and the negative lens has a concave surface facing the object side. The meniscus shape and the negative lens have a meniscus shape with the concave surface facing the object side.
【0075】非球面は第1群の負レンズの物体側の面と
正レンズの両面、及び第2群の正レンズの物体側の面に
用いている。また、第2群を像側に移動させる事で至近
物体へのフォーカシングを行ない、望遠端のレンズ全長
を短くすることが可能になっている。なお、第1群を物
体側に移動させることで至近物体へのフォーカシングを
行なうことも可能であるが、第2群を像側に移動させた
場合のように望遠端のレンズ全長を短くすることは困難
である。
The aspheric surface is used for the object side surface of the first group negative lens and both surfaces of the positive lens, and the object side surface of the second group positive lens. In addition, by moving the second unit to the image side, focusing on a close object is performed, and the total length of the lens at the telephoto end can be reduced. It is also possible to focus on a close object by moving the first unit to the object side. However, as in the case where the second unit is moved to the image side, the total length of the lens at the telephoto end should be shortened. It is difficult.
【0076】本実施例のズームレンズも条件(1)、
(3)、(3−1)、(3−2)、(4)、(4−
1)、(5)、(5−1)、(6)、(6−1)、
(7)、(7−1)、(8)、(8−1)を満足する。
The zoom lens according to the present embodiment also satisfies the condition (1),
(3), (3-1), (3-2), (4), (4-
1), (5), (5-1), (6), (6-1),
(7), (7-1), (8) and (8-1) are satisfied.
【0077】(実施例9)実施例9のズームレンズの断
面図を図10に、収差図を図22に示す。実施例9も実
施例6と同様にレンズ枚数が5枚のズームレンズであ
る。焦点距離は39.2mmから150.5mmであって、変倍比は
3.84である。物体側より順に、正屈折力の第1群と
負屈折力の第2群で構成されている。第1群は物体側よ
り順に、負レンズと正レンズで構成され、第2群は負レ
ンズと正レンズと負レンズで構成されている。また、絞
りは第1群と第2群の間に配置され、第1群と一体にな
っている。本実施例も第2群の正レンズ成分を正レンズ
と負レンズの2つのレンズで構成しているが、PC(ホ゜
リカーホ゛ネイト)は用いられておらず全てガラスを用いてい
る。
Ninth Embodiment FIG. 10 is a sectional view of a zoom lens according to a ninth embodiment, and FIG. 22 is an aberration diagram thereof. The ninth embodiment is also a zoom lens having five lenses as in the sixth embodiment. The focal length is from 39.2 mm to 150.5 mm, and the zoom ratio is 3.84. In order from the object side, it is composed of a first group having a positive refractive power and a second group having a negative refractive power. The first group includes, in order from the object side, a negative lens and a positive lens, and the second group includes a negative lens, a positive lens, and a negative lens. The aperture is disposed between the first and second groups, and is integrated with the first group. In this embodiment, the positive lens component of the second group is composed of two lenses, a positive lens and a negative lens. However, no PC (Polycarbonate) is used and glass is used.
【0078】また、第1群の負レンズは凹面を像側に向
けたメニスカス形状、正レンズは平凸形状、第2群の負
レンズは凹面を像側に向けたメニスカス形状、正レンズ
は凹面を物体側に向けたメニスカス形状、負レンズは凹
面を物体側に向けたメニスカス形状となっている。
The negative lens of the first group has a meniscus shape with the concave surface facing the image side, the positive lens has a plano-convex shape, the negative lens of the second group has a meniscus shape with the concave surface facing the image side, and the positive lens has a concave surface. Has a meniscus shape with the concave surface facing the object side, and the negative lens has a meniscus shape with the concave surface facing the object side.
【0079】非球面は第1群の負レンズの物体側の面と
正レンズの両面、及び第2群の負レンズの物体側の面に
用いている。また、第2群を像側に移動させる事で至近
物体へのフォーカシングを行ない、望遠端のレンズ全長
を短くすることが可能になっている。なお、第1群を物
体側に移動させることで至近物体へのフォーカシングを
行なうことも可能であるが、第2群を像側に移動させた
場合のように望遠端のレンズ全長を短くすることは困難
である。
The aspheric surface is used for the object side surface of the first group negative lens and both surfaces of the positive lens, and the object side surface of the second group negative lens. In addition, by moving the second unit to the image side, focusing on a close object is performed, and the total length of the lens at the telephoto end can be reduced. It is also possible to focus on a close object by moving the first unit to the object side. However, as in the case where the second unit is moved to the image side, the total length of the lens at the telephoto end should be shortened. It is difficult.
【0080】本実施例のズームレンズも条件(1)、
(3)、(3−1)、(3−2)、(4)、(4−
1)、(5)、(5−1)、(6)、(6−1)、
(7)、(7−1)、(8)、(8−1)を満足する。
The zoom lens according to the present embodiment also satisfies the condition (1),
(3), (3-1), (3-2), (4), (4-
1), (5), (5-1), (6), (6-1),
(7), (7-1), (8) and (8-1) are satisfied.
【0081】(実施例10)実施例10のズームレンズ
の断面図を図11に、収差図を図23に示す。実施例1
0はレンズ枚数が5枚と少ないながら、焦点距離が39.1
mmから156.3mmであって、変倍比が4.00のズームレ
ンズである。物体側より順に、正屈折力の第1群と、負
屈折力の第2群と、負屈折力の第3群で構成されてい
る。第1群は物体側より順に、負レンズと正レンズで構
成され、第2群は正レンズと負レンズで構成され、第3
群は負レンズ1枚で構成されている。また、絞りは第1
群と第2群の間に配置され、第1群と一体になってい
る。
(Embodiment 10) FIG. 11 is a sectional view of the zoom lens according to Embodiment 10, and FIG. Example 1
0 means that the number of lenses is as small as 5 but the focal length is 39.1
The zoom lens has a zoom ratio of 4.00 mm to 156.3 mm and a magnification ratio of 4.00. In order from the object side, it is composed of a first group having a positive refractive power, a second group having a negative refractive power, and a third group having a negative refractive power. The first group includes, in order from the object side, a negative lens and a positive lens. The second group includes a positive lens and a negative lens.
The group consists of one negative lens. The aperture is the first
It is arranged between the group and the second group and is integral with the first group.
【0082】実施例10のズームレンズは3群構成のレ
ンズ系であって、実施例1乃至実施例9の負屈折力の第
2群をさらに2つの群に分割したものである。負屈折力
のレンズ群を2つにすることで、負屈折力のレンズ群が
1つの場合に比べて収差発生量を小さくすることを可能
となった。このような構成により、各群の屈折力を強く
して、特に、テレ側の全長を小さくすることができる。
また、負屈折力のレンズ群で発生するワイド側の像面湾
曲を良好に補正することを可能としている。
The zoom lens of the tenth embodiment is a three-unit lens system, and is obtained by further dividing the second group having a negative refractive power of the first to ninth embodiments into two groups. By using two negative refractive power lens groups, it becomes possible to reduce the amount of aberration generated as compared with the case where there is one negative refractive power lens group. With such a configuration, the refracting power of each group can be increased, and in particular, the total length on the telephoto side can be reduced.
Further, it is possible to satisfactorily correct a wide-side field curvature generated by a lens unit having a negative refractive power.
【0083】また、第1群の負レンズは両凹形状、正レ
ンズは両凸形状、第2群の正レンズは凹面を物体側に向
けたメニスカス形状、負レンズは凹面を物体側に向けた
メニスカス形状、第3群の負レンズは凹面を物体側に向
けたメニスカス形状となっている。なお、第2群の正レ
ンズは倍率の色収差を良好に補正するため、高分散な光
学素子であるPC(ホ゜リカーホ゛ネイト)を用いている。
The negative lens of the first group has a biconcave shape, the positive lens has a biconvex shape, the positive lens of the second group has a meniscus shape with the concave surface facing the object side, and the negative lens has the concave surface facing the object side. The negative lens of the third group has a meniscus shape with the concave surface facing the object side. The positive lens of the second group uses a PC (polycarbonate) which is a high-dispersion optical element in order to satisfactorily correct lateral chromatic aberration.
【0084】非球面は第1群の負レンズの物体側の面と
正レンズの両面、及び第2群の正レンズの両面と負レン
ズの像側の面に用いている。また、至近物体へのフォー
カシングは第3群を像側に移動させることによって行な
い、望遠端のレンズ全長を短くすることを実現してい
る。なお、第1群を物体側に移動させることで至近物体
へのフォーカシングを行なうことも可能であるが、第3
群を像側に移動させた場合のように望遠端のレンズ全長
を短くすることは困難である。
The aspherical surface is used for both the object side surface of the first group negative lens and both surfaces of the positive lens, and the both surface of the second group positive lens and the image side surface of the negative lens. Focusing on the closest object is performed by moving the third lens unit to the image side, thereby shortening the overall length of the lens at the telephoto end. It is also possible to perform focusing on a close object by moving the first lens unit to the object side.
It is difficult to shorten the entire length of the lens at the telephoto end as in the case where the group is moved to the image side.
【0085】本実施例のズームレンズは条件(1)、
(3)、(3−1)、(3−3)、(4)、(4−
1)、(5)、(5−1)、(6)、(6−1)、
(7)、(7−1)、(9)、(9−1)を満足する。
The zoom lens according to the present embodiment satisfies the condition (1),
(3), (3-1), (3-3), (4), (4-
1), (5), (5-1), (6), (6-1),
(7), (7-1), (9), and (9-1) are satisfied.
【0086】(実施例11)実施例11のズームレンズ
の断面図を図12に、収差図を図24に示す。実施例1
1も実施例10と同様にレンズ枚数が5枚と少ないなが
ら、焦点距離が39.1mmから154.0mmであって、変倍比が
3.94のズームレンズである。物体側より順に、正の
屈折力の第1群と、負の屈折力の第2群と、負の屈折力
の第3群で構成されている。第1群は物体側より順に、
負レンズと正レンズで構成され、第2群は正レンズと負
レンズで構成され、第3群は負レンズ1枚で構成されて
いる。また、絞りは第1群と第2群の間に配置され、第
1群と一体になっている。
(Embodiment 11) FIG. 12 is a sectional view of the zoom lens according to Embodiment 11, and FIG. Example 1
1 is a zoom lens having a focal length of 39.1 mm to 154.0 mm and a zoom ratio of 3.94, although the number of lenses is as small as 5 as in the tenth embodiment. In order from the object side, the first lens unit includes a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a third lens unit having a negative refractive power. The first group, in order from the object side,
The second group is composed of a positive lens and a negative lens, and the third group is composed of one negative lens. The aperture is disposed between the first and second groups, and is integrated with the first group.
【0087】また、第1群の負レンズは両凹形状、正レ
ンズは両凸形状、第2群の正レンズは凹面を物体側に向
けたメニスカス形状、負レンズは凹面を物体側に向けた
メニスカス形状、第3群の負レンズは凹面を物体側に向
けたメニスカス形状となっている。
The negative lens in the first group has a biconcave shape, the positive lens has a biconvex shape, the positive lens in the second group has a meniscus shape with the concave surface facing the object side, and the negative lens has the concave surface facing the object side. The negative lens of the third group has a meniscus shape with the concave surface facing the object side.
【0088】非球面は第1群の負レンズの物体側の面と
正レンズの両面、及び第2群の正レンズの物体側の面と
負レンズの像側の面に用いている。また、至近物体への
フォーカシングは第3群を像側に移動させることによっ
て行ない、望遠端のレンズ全長を短くすることを実現し
ている。なお、第1群を物体側に移動させることで至近
物体へのフォーカシングを行なうことも可能であるが、
第3群を像側に移動させた場合のように望遠端のレンズ
全長を短くすることは困難である。
The aspherical surface is used for the object side surface of the first group negative lens and both surfaces of the positive lens, and the object side surface of the second group positive lens and the image side surface of the negative lens. Focusing on the closest object is performed by moving the third lens unit to the image side, thereby shortening the overall length of the lens at the telephoto end. It is also possible to perform focusing on a close object by moving the first lens unit to the object side,
It is difficult to shorten the entire length of the lens at the telephoto end as in the case where the third unit is moved to the image side.
【0089】本実施例のズームレンズは条件(1)、
(3)、(3−1)、(3−3)、(4)、(4−
1)、(5)、(5−1)、(6)、(6−1)、
(7)、(7−1)、(9)、(9−1)を満足する。
The zoom lens according to the present embodiment satisfies the condition (1),
(3), (3-1), (3-3), (4), (4-
1), (5), (5-1), (6), (6-1),
(7), (7-1), (9), and (9-1) are satisfied.
【0090】(実施例12)実施例12のズームレンズ
の断面図を図13に、収差図を図25に示す。実施例1
1も実施例10と同様にレンズ枚数が5枚と少ないなが
ら、焦点距離が39.0mmから180.7mmであって、変倍比が
4.63のズームレンズである。物体側より順に、正の
屈折力の第1群と、負の屈折力の第2群と、負の屈折力
の第3群で構成されている。第1群は物体側より順に、
負レンズと正レンズで構成され、第2群は正レンズと負
レンズで構成され、第3群は負レンズ1枚で構成されて
いる。また、絞りは第1群と第2群の間に配置され、第
1群と一体になっている。
Example 12 FIG. 13 is a sectional view of the zoom lens of Example 12, and FIG. 25 is an aberration diagram thereof. Example 1
1 is a zoom lens having a focal length of 39.0 mm to 180.7 mm and a zoom ratio of 4.63 although the number of lenses is as small as 5 as in the tenth embodiment. In order from the object side, the first lens unit includes a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a third lens unit having a negative refractive power. The first group, in order from the object side,
The second group is composed of a positive lens and a negative lens, and the third group is composed of one negative lens. The aperture is disposed between the first and second groups, and is integrated with the first group.
【0091】また、第1群の負レンズは両凹形状、正レ
ンズは両凸形状、第2群の正レンズは凹面を物体側に向
けたメニスカス形状、負レンズは両凹形状、第3群の負
レンズは凹面を物体側に向けたメニスカス形状となって
いる。
The negative lens of the first group is biconcave, the positive lens is biconvex, the positive lens of the second group is meniscus with the concave surface facing the object side, the negative lens is biconcave, and the third group is Has a meniscus shape with the concave surface facing the object side.
【0092】非球面は第1群の負レンズの物体側の面と
正レンズの両面、及び第2群の正レンズの両面と負レン
ズの像側の面に用いている。また、至近物体へのフォー
カシングは第3群を像側に移動させることによって行な
い、望遠端のレンズ全長を短くすることを実現してい
る。なお、第1群を物体側に移動させることで至近物体
へのフォーカシングを行なうことも可能であるが、第3
群を像側に移動させた場合のように望遠端のレンズ全長
を短くすることは困難である。
The aspheric surface is used for both the object side surface of the first group negative lens and both surfaces of the positive lens, and the both surface of the second group positive lens and the image side surface of the negative lens. Focusing on the closest object is performed by moving the third lens unit to the image side, thereby shortening the overall length of the lens at the telephoto end. It is also possible to perform focusing on a close object by moving the first lens unit to the object side.
It is difficult to shorten the entire length of the lens at the telephoto end as in the case where the group is moved to the image side.
【0093】本実施例のズームレンズは条件(1)、
(3)、(3−1)、(3−3)、(4)、(4−
1)、(5)、(5−1)、(6)、(6−1)、
(7)、(7−1)、(9)、(9−1)を満足する。
The zoom lens according to the present embodiment satisfies the condition (1),
(3), (3-1), (3-3), (4), (4-
1), (5), (5-1), (6), (6-1),
(7), (7-1), (9), and (9-1) are satisfied.
【0094】以下に、上記各実施例の数値データを示す
が、記号は上記のほか、fは全系の焦点距離、FNOはF
ナンバー、2ωは画角、FBはバックフォーカス、
1、r2…は各レンズ面の曲率半径、d1、d2…は各レ
ンズ面間の間隔、n1、n2…は各レンズのd線の屈折
率、ν1、ν2…は各レンズのアッベ数である。なお、非
球面形状は、光軸方向をZ、光軸に直行する方向をYとし
た時、以下の式で近似される。
The numerical data of each of the above embodiments is shown below. In addition to the symbols, f is the focal length of the entire system, F NO is F
Number, 2ω is angle of view, FB is back focus,
r 1, r 2 ... curvature radius of each lens surface, d 1, d 2 ... the spacing between the lens surfaces, n 1, n 2 ... d-line refractive index of each lens, ν 1, ν 2 ... Is the Abbe number of each lens. The aspherical shape is approximated by the following equation, where Z is the optical axis direction and Y is the direction perpendicular to the optical axis.
【0095】Z=(Y2/r)/[1+[1−(K+1)・(Y
/r)2]1/2]+A4Y4+A6Y6+A8Y8+A10Y10+A12Y12+… ただし、Kは円錐定数、A4、A6、A8、A10、A12、…はそ
れぞれ4次、6次、8次、10次、12次、…の非球面
係数である。また、非球面係数の値の表示において、例
えば1.0000e-080は1.000×10-8のことである。
Z = (Y 2 / r) / [1+ [1- (K + 1) · (Y
/ R) 2] 1/2] + A 4 Y 4 + A 6 Y 6 + A 8 Y 8 + A 10 Y 10 + A 12 Y 12 + ... However, K is a conic constant, A 4, A 6, A 8, A 10, A 12 ,... Are the fourth, sixth, eighth, tenth, twelfth,. In the display of the value of the aspheric coefficient, for example, 1.000e-080 is 1.000 × 10 −8 .
【0096】 (実施例1) r1= 34.412(非球面)d1=1.300 n1=1.84666 ν1=23.78 r2= 24.466 d2=8.507 r3= 149.580(非球面)d3=3.706 n2=1.48749 ν2=70.23 r4= -13.012(非球面)d4=0.500 r5=INF d5=D1 r6= 63.626(非球面)d6=7.380 n3=1.58423 ν3=30.49 r7=-181.335 d7=3.940 r8= -13.142 d8=1.100 n4=1.88300 ν4=40.76 r9=-113.168 絞り面 5 非球面係数 第1面 k = 0.0000 A4 =-5.8569e-005 A6 =-4.7161e-007 A8 = 6.6160e-010 A10=-3.3650e-011 A12= 0.0000 第3面 k = 0.0000 A4 = 3.5811e-006 A6 =-7.7667e-008 A8 = 1.2825e-008 A10=-2.2329e-010 A12= 0.0000 第4面 k = 0.0000 A4 = 1.9803e-005 A6 = 2.6641e-007 A8 = 2.1700e-009 A10=-5.7050e-011 A12=-7.5632e-013 第6面 k = 0.0000 A4 = 3.5476e-005 A6 = 4.3353e-007 A8 =-6.1066e-009 A10= 3.8966e-011 A12= 1.9239e-014 ズームデータ 広角端 中間 望遠端 f(mm) 38.901 72.050 127.347 FNO 5.767 9.178 11.669 2ω(°) 56.5 32.9 19.2 FB(mm) 9.686 37.196 83.085 D1 13.001 4.720 0.500[0096] (Example 1) r 1 = 34.412 (aspherical) d 1 = 1.300 n 1 = 1.84666 ν 1 = 23.78 r 2 = 24.466 d 2 = 8.507 r 3 = 149.580 ( aspherical) d 3 = 3.706 n 2 = 1.48749 ν 2 = 70.23 r 4 = -13.012 (aspheric) d 4 = 0.500 r 5 = INF d 5 = D1 r 6 = 63.626 (aspheric) d 6 = 7.380 n 3 = 1.58423 ν 3 = 30.49 r 7 = -181.335 d 7 = 3.940 r 8 = -13.142 d 8 = 1.100 n 4 = 1.88300 ν 4 = 40.76 r 9 = -113.168 Aperture surface 5 Aspheric surface first surface k = 0.0000 A 4 = -5.8569e-005 A 6 = -4.7161e-007 A 8 = 6.6160e-010 A 10 = -3.3650e-011 A 12 = 0.0000 Surface 3 k = 0.0000 A 4 = 3.5811e-006 A 6 = -7.7667e-008 A 8 = 1.2825 e-008 A 10 = -2.2329e-010 A 12 = 0.0000 4th surface k = 0.0000 A 4 = 1.9803e-005 A 6 = 2.6641e-007 A 8 = 2.1700e-009 A 10 = -5.7050e-011 A 12 = -7.5632e-013 Surface 6 k = 0.0000 A 4 = 3.5476e-005 A 6 = 4.3353e-007 A 8 = -6.1066e-009 A 10 = 3.8966e-011 A 12 = 1.9239e-014 Zoom data Wide-angle end Middle telephoto end f (mm) 38.901 72.050 127.347 F NO 5.767 9.178 11.669 2 ω (°) 56.5 32.9 19.2 FB (mm) 9.686 37.196 83.085 D1 13.001 4.720 0.500
【0097】 (実施例2) r1= 31.210(非球面)d1=1.200 n1=1.84666 ν1=23.78 r2= 24.336 d2=9.971 r3= 66.580(非球面)d3=4.088 n2=1.48749 ν2=70.23 r4= -14.698(非球面)d4=0.500 r5=INF d5=D1 r6= 248.286(非球面)d6=6.443 n3= 1.58423 ν3=30.49 r7=-115.040 d7=4.617 r8= -11.804 d8=1.000 n4=1.81600 ν4=46.62 r9= -52.358 絞り面 5 非球面係数 第1面 k = 0.0000 A4 =-4.0530e-005 A6 =-3.4031e-007 A8 = 1.5731e-009 A10=-2.2578e-011 A12= 0.0000 第3面 k = 0.0000 A4 =-4.8646e-006 A6 = 4.9390e-007 A8 =-8.3689e-009 A10= 1.1800e-011 A12= 0.0000 第4面 k = 0.0000 A4 = 1.5019e-005 A6 = 6.6259e-007 A8 =-1.0607e-008 A10= 3.4652e-011 A12= 0.0000 第6面 k = 0.0000 A4 = 4.3210e-005 A6 = 3.4596e-007 A8 =-2.8775e-009 A10= 2.2623e-011 A12= 0.0000 ズームデータ 広角端 中間 望遠端 f(mm) 39.202 76.011 150.400 Fno 5.664 9.440 12.643 2ω (°) 56.4 31.5 16.3 FB(mm) 9.315 39.491 100.477 D1 12.760 4.730 0.500(Example 2) r 1 = 31.210 (aspherical surface) d 1 = 1.200 n 1 = 1.84666 ν 1 = 23.78 r 2 = 24.336 d 2 = 9.971 r 3 = 66.580 (aspherical surface) d 3 = 4.088 n 2 = 1.48749 ν 2 = 70.23 r 4 = -14.698 (aspherical surface) d 4 = 0.500 r 5 = INF d 5 = D1 r 6 = 248.286 (aspherical surface) d 6 = 6.443 n 3 = 1.58423 ν 3 = 30.49 r 7 = -115.040 d 7 = 4.617 r 8 = -11.804 d 8 = 1.000 n 4 = 1.81600 ν 4 = 46.62 r 9 = -52.358 Aperture surface 5 Aspherical surface first surface k = 0.0000 A 4 = -4.0530e-005 A 6 = -3.4031e-007 A 8 = 1.5731e-009 A 10 = -2.2578e-011 A 12 = 0.0000 Surface 3 k = 0.0000 A 4 = -4.8646e-006 A 6 = 4.9390e-007 A 8 =- 8.3689e-009 A 10 = 1.1800e-011 A 12 = 0.0000 Surface 4 k = 0.0000 A 4 = 1.5019e-005 A 6 = 6.6259e-007 A 8 = -1.0607e-008 A 10 = 3.4652e-011 A 12 = 0.0000 Surface 6 k = 0.0000 A 4 = 4.3210e-005 A 6 = 3.4596e-007 A 8 = -2.8775e-009 A 10 = 2.2623e-011 A 12 = 0.0000 Zoom data Wide angle end Middle Tele end f (mm) 39.202 76.011 150.400 F no 5.664 9.440 12.643 2ω (°) 5 6.4 31.5 16.3 FB (mm) 9.315 39.491 100.477 D1 12.760 4.730 0.500
【0098】 (実施例3) r1=-436.607(非球面)d1= 1.200 n1=1.84666 ν1=23.78 r2= 227.852 d2=11.027 r3= 30.765(非球面)d3= 3.710 n2=1.48749 ν2=70.23 r4= -17.530(非球面)d4= 0.500 r5=INF d5=D1 r6=-104.078(非球面)d6= 7.841 n3=1.58423 ν3=30.49 r7= -43.433 d7= 4.755 r8= -10.965(非球面)d8=1.000 n4=1.81600 ν4=46.62 r9= -76.194 絞り面 5 非球面係数 第1面 k = 0.0000 A4 =-3.2879e-005 A6 =-3.2615e-007 A8 = 7.7064e-009 A10=-1.1020e-010 A12= 5.4419e-013 第3面 k = 0.0000 A4 = 4.5993e-005 A6 =-4.4329e-007 A8 = 5.0842e-008 A10=-1.5638e-009 A12= 1.4797e-011 第4面 k = 0.0000 A4 = 7.2828e-005 A6 = 5.0120e-007 A8 =-9.5226e-010 A10=-6.5117e-010 A12= 9.8293e-012 第6面 k = 0.0000 A4 = 4.0295e-005 A6 = 9.8730e-007 A8 =-5.6098e-008 A10= 1.0171e-009 A12=-5.4281e-012 第8面 k = 0.0000 A4 = 2.0645e-005 A6 = 3.8173e-007 A8 =-1.4281e-008 A10= 2.9853e-010 A12=-1.2558e-012 ズームデータ 広角端 中間 望遠端 f(mm) 32.923 69.972 154.045 Fno 5.604 8.976 12.814 2ω(°) 65.1 33.8 15.9 FB(mm) 5.370 32.613 94.435 D1 11.377 3.985 0.400(Example 3) r 1 = −436.607 (aspheric surface) d 1 = 1.200 n 1 = 1.84666 ν 1 = 23.78 r 2 = 227.852 d 2 = 11.027 r 3 = 30.765 (aspheric surface) d 3 = 3.710 n 2 = 1.48749 ν 2 = 70.23 r 4 = -17.530 (aspherical surface) d 4 = 0.500 r 5 = INF d 5 = D1 r 6 = -104.078 (aspherical surface) d 6 = 7.841 n 3 = 1.58423 ν 3 = 30.49 r 7 = -43.433 d 7 = 4.755 r 8 = -10.965 (aspherical surface) d 8 = 1.000 n 4 = 1.81600 ν 4 = 46.62 r 9 = -76.194 Aperture surface 5 Aspherical coefficient first surface k = 0.0000 A 4 =- 3.2879e-005 A 6 = -3.2615e-007 A 8 = 7.7064e-009 A 10 = -1.1020e-010 A 12 = 5.4419e-013 Surface 3 k = 0.0000 A 4 = 4.5993e-005 A 6 = -4.4329e-007 A 8 = 5.0842e-008 A 10 = -1.5638e-009 A 12 = 1.4797e-011 Surface 4 k = 0.0000 A 4 = 7.2828e-005 A 6 = 5.0120e-007 A 8 = -9.5226e-010 A 10 = -6.5117e-010 A 12 = 9.8293e-012 Surface 6 k = 0.0000 A 4 = 4.0295e-005 A 6 = 9.8730e-007 A 8 = -5.6098e-008 A 10 = 1.0171e-009 A 12 = -5.4281e-012 8th surface k = 0.0000 A 4 = 2.0645e-005 A 6 = 3.8173e-007 A 8 = -1.4281e-008 A 10 = 2.9853e-010 A 12 = -1.2558e-012 Zoom data Wide-angle end Medium Telephoto end f (mm) 32.923 69.972 154.045 F no 5.604 8.976 12.814 2ω (°) 65.1 33.8 15.9 FB (mm) 5.370 32.613 94.435 D1 11.377 3.985 0.400
【0099】 (実施例4) r1= 33.165(非球面)d1=1.200 n1=1.84666 ν1=23.78 r2= 25.507 d2=9.038 r3= 84.687 d3=3.672 n2=1.48749 ν2=70.23 r4= -13.524(非球面)d4=0.500 r5=INF d5=D1 r6= 202.330(非球面)d6=5.754 n3=1.58423 ν3=30.49 r7=-147.071 d7=4.578 r8= -11.319 d8=1.000 n4=1.81600 ν4=46.62 r9= -50.922 絞り面 5 非球面係数 第1面 k = 0.0000 A4 =-5.0672e-005 A6 =-4.0011e-007 A8 = 2.6261e-010 A10=-2.4689e-011 A12=-4.0538e-014 第4面 k = 0.0000 A4 = 3.2167e-005 A6 =-8.2321e-007 A8 = 3.3440e-008 A10=-5.1746e-010 A12= 2.9757e-012 第6面 k = 0.0000 A4 = 5.8786e-005 A6 =-6.8130e-007 A8 = 3.4194e-008 A10=-4.8569e-010 A12= 2.4860e-012 ズームデータ 広角端 中間 望遠端 f(mm) 37.812 78.404 180.456 FNO 5.947 9.730 15.051 2ω(°) 58.1 30.5 13.7 FB(mm) 8.587 40.791 121.752 D1 12.760 4.730 0.500(Example 4) r 1 = 33.165 (aspherical surface) d 1 = 1.200 n 1 = 1.84666 ν 1 = 23.78 r 2 = 25.507 d 2 = 9.038 r 3 = 84.687 d 3 = 3.672 n 2 = 1.48749 ν 2 = 70.23 r 4 = -13.524 (aspherical surface) d 4 = 0.500 r 5 = INF d 5 = D1 r 6 = 202.330 (aspherical surface) d 6 = 5.754 n 3 = 1.58423 ν 3 = 30.49 r 7 = -147.071 d 7 = 4.578 r 8 = -11.319 d 8 = 1.000 n 4 = 1.81600 ν 4 = 46.62 r 9 = -50.922 Aperture surface 5 Aspheric surface first surface k = 0.0000 A 4 = -5.0672e-005 A 6 = -4.0011e -007 A 8 = 2.6261e-010 A 10 = -2.4689e-011 A 12 = -4.0538e-014 Side 4 k = 0.0000 A 4 = 3.2167e-005 A 6 = -8.2321e-007 A 8 = 3.3440 e-008 A 10 = -5.1746e-010 A 12 = 2.9757e-012 Surface 6 k = 0.0000 A 4 = 5.8786e-005 A 6 = -6.8130e-007 A 8 = 3.4194e-008 A 10 =- 4.8569e-010 A 12 = 2.4860e-012 Zoom data Wide angle end Middle telephoto end f (mm) 37.812 78.404 180.456 F NO 5.947 9.730 15.051 2ω (°) 58.1 30.5 13.7 FB (mm) 8.587 40.791 121.752 D1 12.760 4.730 0.500
【0100】 (実施例5) r1= 25.194(非球面)d1=1.200 n1=1.84666 ν1=23.78 r2= 21.272 d2=8.749 r3= 724.954(非球面)d3=2.820 n2=1.48749 ν2=70.23 r4= -13.738(非球面)d4=0.500 r5=INF d5=D1 r6=-193.212(非球面)d6=6.055 n3=1.59270 ν3=35.31 r7= -40.974 d7=4.320 r8= -12.861 d8=1.000 n4=1.77250 ν4=49.60 r9= -76.771 絞り面 5 非球面係数 第1面 k = 0.0000 A4 =-4.7280e-005 A6 =-4.1474e-007 A8 = 7.9294e-010 A10=-3.6676e-011 A12= 0.0000 第3面 k = 0.0000 A4 = 1.3756e-006 A6 = 6.3039e-007 A8 =-1.4996e-008 A10= 1.3208e-010 A12= 0.0000 第4面 k = 0.0000 A4 = 1.3559e-005 A6 = 3.9114e-007 A8 =-1.1426e-008 A10= 1.0792e-010 A12= 0.0000 第6面 k = 0.0000 A4 = 4.1817e-005 A6 =-2.6374e-008 A8 = 3.0687e-009 A10=-1.2486e-011 A12= 0.0000 ズームデータ 広角端 中間 望遠端 f(mm) 39.163 79.442 151.266 Fno 5.439 9.850 12.651 2ω(°) 56.1 30.2 16.3 FB(mm) 7.364 42.957 106.426 D1 17.025 5.880 0.734(Example 5) r 1 = 25.194 (aspheric surface) d 1 = 1.200 n 1 = 1.84666 ν 1 = 23.78 r 2 = 21.272 d 2 = 8.749 r 3 = 724.954 (aspheric surface) d 3 = 2.820 n 2 = 1.48749 ν 2 = 70.23 r 4 = -13.738 (aspherical surface) d 4 = 0.500 r 5 = INF d 5 = D1 r 6 = -193.212 (aspherical surface) d 6 = 6.055 n 3 = 1.59270 ν 3 = 35.31 r 7 = -40.974 d 7 = 4.320 r 8 = -12.861 d 8 = 1.000 n 4 = 1.77250 ν 4 = 49.60 r 9 = -76.771 Aperture surface 5 Aspheric surface first surface k = 0.0000 A 4 = -4.7280e-005 A 6 = -4.1474e-007 A 8 = 7.9294e-010 A 10 = -3.6676e-011 A 12 = 0.0000 Third surface k = 0.0000 A 4 = 1.3756e-006 A 6 = 6.3039e-007 A 8 =- 1.4996e-008 A 10 = 1.3208e-010 A 12 = 0.0000 Surface 4 k = 0.0000 A 4 = 1.3559e-005 A 6 = 3.9114e-007 A 8 = -1.1426e-008 A 10 = 1.0792e-010 A 12 = 0.0000 Surface 6 k = 0.0000 A 4 = 4.1817e-005 A 6 = -2.6374e-008 A 8 = 3.0687e-009 A 10 = -1.2486e-011 A 12 = 0.0000 Zoom data Wide-angle end Middle Telephoto Edge f (mm) 39.163 79.442 151.266 F no 5.439 9.850 12.651 2ω (°) 56 .1 30.2 16.3 FB (mm) 7.364 42.957 106.426 D1 17.025 5.880 0.734
【0101】 (実施例6) r1 = 31.503(非球面)d1 =1.200 n1=1.84666 ν1=23.78 r2 = 24.469 d2 =9.391 r3 = 72.673(非球面)d3 =3.583 n2=1.48749 ν2=70.23 r4 =-14.288(非球面)d4 =0.500 r5 =INF d5 =D1 r6 =165.865(非球面)d6 =3.516 n3=1.58423 ν3=30.49 r7 =285.957 d7 =0.209 r8 =320.577 d8 =3.289 n4=1.63980 ν4=34.46 r9 =-84.201 d9 =3.608 r10=-11.567 d10=1.000 n5=1.81600 ν5=46.62 r11=-63.623 絞り面 5 非球面係数 第1面 k = 0.0000 A4 =-4.6228e-005 A6 =-4.5135e-007 A8 = 2.6950e-009 A10=-3.5769e-011 A12= 0.0000 第3面 k = 0.0000 A4 =-1.1747e-006 A6 = 9.6673e-007 A8 =-1.6707e-008 A10= 1.3859e-010 A12= 0.0000 第4面 k = 0.0000 A4 = 1.2694e-005 A6 = 1.1765e-006 A8 =-2.0045e-008 A10= 1.6230e-010 A12= 0.0000 第6面 k = 0.0000 A4 = 4.7717e-005 A6 = 5.0593e-007 A8 =-5.2272e-009 A10= 4.0431e-011 A12= 0.0000 ズームデータ 広角端 中間 望遠端 f(mm) 39.005 74.724 150.491 FNO 5.630 9.257 12.651 2ω(°) 56.5 31.9 16.3 FB(mm) 9.662 39.193 101.832 D1 12.800 4.863 0.500 (Example 6) r 1 = 31.503 (aspheric surface) d 1 = 1.200 n 1 = 1.84666 ν 1 = 23.78 r 2 = 24.469 d 2 = 9.391 r 3 = 72.673 (aspheric surface) d 3 = 3.583 n 2 = 1.48749 ν 2 = 70.23 r 4 = -14.288 (aspheric) d 4 = 0.500 r 5 = INF d 5 = D1 r 6 = 165.865 (aspheric) d 6 = 3.516 n 3 = 1.58423 ν 3 = 30.49 r 7 = 285.957 d 7 = 0.209 r 8 = 320.577 d 8 = 3.289 n 4 = 1.63980 ν 4 = 34.46 r 9 = -84.201 d 9 = 3.608 r 10 = -11.567 d 10 = 1.000 n 5 = 1.81600 ν 5 = 46.62 r 11 = -63.623 Aperture surface 5 Aspheric coefficient First surface k = 0.0000 A 4 = -4.6228e-005 A 6 = -4.5135e-007 A 8 = 2.6950e-009 A 10 = -3.5769e-011 A 12 = 0.0000 3rd side k = 0.0000 A 4 = -1.1747e-006 A 6 = 9.6673e-007 A 8 = -1.6707e-008 A 10 = 1.3859e-010 A 12 = 0.0000 4th side k = 0.0000 A 4 = 1.2694e -005 A 6 = 1.1765e-006 A 8 = -2.0045e-008 A 10 = 1.6230e-010 A 12 = 0.0000 Surface 6 k = 0.0000 A 4 = 4.7717e-005 A 6 = 5.0593e-007 A 8 = -5.2272e-009 A 10 = 4.0431e -011 A 12 = 0.0000 zoom data wide-angle end in Telephoto end f (mm) 39.005 74.724 150.491 F NO 5.630 9.257 12.651 2ω (°) 56.5 31.9 16.3 FB (mm) 9.662 39.193 101.832 D1 12.800 4.863 0.500
【0102】 (実施例7) r1 = 27.223(非球面)d1 =1.200 n1=1.84666 ν1=23.78 r2 = 21.422 d2 =8.515 r3 = 465.271(非球面)d3 =2.820 n2=1.48749 ν2=70.23 r4 = -13.309(非球面)d4 =0.500 r5 =INF d5 =D1 r6 =-799.474(非球面)d6 =3.032 n3=1.52542 ν3=55.78 r7 = 541.727 d7 =0.323 r8 = 265.124 d8 =3.071 n4=1.59270 ν4=35.31 r9 = -57.986 d9 =4.348 r10= -13.307 d10=1.200 n5=1.77250 ν5=49.60 r11= -98.356 絞り面 5 非球面係数 第1面 k = 0.0000 A4 =-5.6401e-005 A6 =-3.7116e-007 A8 =-9.8762e-010 A10=-2.9357e-011 A12= 0.0000 第3面 k = 0.0000 A4 = 6.9849e-006 A6 = 8.9623e-007 A8 =-2.8392e-008 A10= 3.2189e-010 A12= 0.0000 第4面 k = 0.0000 A4 = 1.1980e-005 A6 = 8.0610e-007 A8 =-2.6150e-008 A10= 2.9859e-010 A12= 0.0000 第6面 k = 0.0000 A4 = 3.9857e-005 A6 =-2.0990e-009 A8 = 3.4748e-009 A10=-1.9074e-011 A12= 0.0000 ズームデータ 広角端 中間 望遠端 f(mm) 38.914 79.140 151.400 FNO 5.396 9.841 12.677 2ω(°) 56.5 30.3 16.2 FB(mm) 7.311 42.507 105.733 D1 16.897 5.867 0.774(Example 7) r 1 = 27.223 (aspherical surface) d 1 = 1.200 n 1 = 1.84666 ν 1 = 23.78 r 2 = 21.422 d 2 = 8.515 r 3 = 465.271 (aspherical surface) d 3 = 2.820 n 2 = 1.48749 ν 2 = 70.23 r 4 = -13.309 (aspheric surface) d 4 = 0.500 r 5 = INF d 5 = D1 r 6 = -799.474 (aspheric surface) d 6 = 3.032 n 3 = 1.52542 ν 3 = 55.78 r 7 = 541.727 d 7 = 0.323 r 8 = 265.124 d 8 = 3.071 n 4 = 1.59270 ν 4 = 35.31 r 9 = -57.986 d 9 = 4.348 r 10 = -13.307 d 10 = 1.200 n 5 = 1.77250 ν 5 = 49.60 r 11 = -98.356 Aperture surface 5 Aspheric coefficient First surface k = 0.0000 A 4 = -5.6401e-005 A 6 = -3.7116e-007 A 8 = -9.8762e-010 A 10 = -2.9357e-011 A 12 = 0.0000 3rd side k = 0.0000 A 4 = 6.9849e-006 A 6 = 8.9623e-007 A 8 = -2.8392e-008 A 10 = 3.2189e-010 A 12 = 0.0000 4th side k = 0.0000 A 4 = 1.1980 e-005 A 6 = 8.0610e-007 A 8 = -2.6150e-008 A 10 = 2.9859e-010 A 12 = 0.0000 Surface k = 0.0000 A 4 = 3.9857e-005 A 6 = -2.0990e-009 A 8 = 3.4748e-009 A 10 = -1.9074e-011 A 12 = 0.0000 zoom data wide Intermediate Telephoto end f (mm) 38.914 79.140 151.400 F NO 5.396 9.841 12.677 2ω (°) 56.5 30.3 16.2 FB (mm) 7.311 42.507 105.733 D1 16.897 5.867 0.774
【0103】 (実施例8) r1 = 48.416(非球面)d1 =1.200 n1=1.84666 ν1=23.78 r2 = 36.969 d2 =6.568 r3 = 360.833(非球面)d3 =4.259 n2=1.48749 ν2=70.23 r4 = -13.113(非球面)d4 =0.500 r5 =INF d5 =D1 r6 = 69.425(非球面)d6 =2.705 n3=1.52542 ν3=55.79 r7 =-4699.789 d7 =2.851 r8 = -15.594 d8 =3.496 n4=1.78472 ν4=25.68 r9 = -15.974 d9 =2.974 r10= -10.881 d10=1.200 n5=1.72916 ν5=54.68 r11= -45.630 絞り面 5 非球面係数 第1面 k = 0.0000 A4 =-6.0777e-005 A6 =-4.3568e-007 A8 = 2.7301e-009 A10=-5.1618e-011 A12= 0.0000 第3面 k = 0.0000 A4 = 1.8211e-006 A6 =-6.1220e-007 A8 = 1.7366e-008 A10=-5.8411e-010 A12= 0.0000 第4面 k = 0.0000 A4 = 1.2980e-005 A6 =-4.4452e-007 A8 = 1.1146e-008 A10=-3.7822e-010 A12= 0.0000 第6面 k = 0.0000 A4 = 7.0254e-005 A6 = 2.9806e-007 A8 =-2.5591e-010 A10= 4.3032e-011 A12= 0.0000 ズームデータ 広角端 中間 望遠端 f(mm) 39.324 76.131 150.398 FNO 5.483 9.145 12.537 2ω(°) 55.7 31.3 16.3 FB(mm) 7.596 38.973 102.285 D1 13.843 5.108 0.500Example 8 r 1 = 48.416 (aspherical surface) d 1 = 1.200 n 1 = 1.84666 ν 1 = 23.78 r 2 = 36.969 d 2 = 6.568 r 3 = 360.833 (aspherical surface) d 3 = 4.259 n 2 = 1.48749 ν 2 = 70.23 r 4 = -13.113 (aspheric) d 4 = 0.500 r 5 = INF d 5 = D1 r 6 = 69.425 (aspheric) d 6 = 2.705 n 3 = 1.52542 ν 3 = 55.79 r 7 = -4699.789 d 7 = 2.851 r 8 = -15.594 d 8 = 3.496 n 4 = 1.78472 ν 4 = 25.68 r 9 = -15.974 d 9 = 2.974 r 10 = -10.881 d 10 = 1.200 n 5 = 1.72916 ν 5 = 54.68 r 11 = -45.630 Aperture surface 5 Aspheric surface first surface k = 0.0000 A 4 = -6.0777e-005 A 6 = -4.3568e-007 A 8 = 2.7301e-009 A 10 = -5.1618e-011 A 12 = 0.0000 3rd surface k = 0.0000 A 4 = 1.8211e-006 A 6 = -6.1220e-007 A 8 = 1.7366e-008 A 10 = -5.8411e-010 A 12 = 0.0000 4th surface k = 0.0000 A 4 = 1.2980e-005 A 6 = -4.4452e-007 A 8 = 1.1146e-008 A 10 = -3.7822e-010 A 12 = 0.0000 Surface 6 k = 0.0000 A 4 = 7.0254e-005 A 6 = 2.9806e- 007 A 8 = -2.5591e-010 A 10 = 4.3032e-011 A 12 = 0.0000 zoom data wide Intermediate Telephoto end f (mm) 39.324 76.131 150.398 F NO 5.483 9.145 12.537 2ω (°) 55.7 31.3 16.3 FB (mm) 7.596 38.973 102.285 D1 13.843 5.108 0.500
【0104】 (実施例9) r1 = 51.587(非球面)d1 =1.200 n1=1.84666 ν1=23.78 r2 = 35.082 d2 =6.196 r3 =67032.480(非球面)d3 =4.538 n2=1.48749 ν2=70.23 r4 = -12.296(非球面)d4 =0.500 r5 = INF d5 =D1 r6 = 133.140(非球面)d6 =1.300 n3=1.80610 ν3=40.92 r7 = 66.082 d7 =0.975 r8 = -191.803 d8 =2.200 n4=1.80518 ν4=25.42 r9 = -78.635 d9 =5.927 r10= -10.737 d10=1.000 n5=1.69680 ν5=55.53 r11= -30.399 絞り面 5 非球面係数 第1面 k = 0.0000 A4 =-6.8156e-005 A6 =-3.8295e-007 A8 =-1.0476e-009 A10=-2.6471e-011 A12= 0.0000 第3面 k = 0.0000 A4 =-9.0861e-006 A6 =-1.2445e-006 A8 = 3.5837e-008 A10=-8.9054e-010 A12= 0.0000 第4面 k = 0.0000 A4 = 1.1350e-005 A6 =-8.1167e-007 A8 = 2.0180e-008 A10=-5.0173e-010 A12= 0.0000 第6面 k = 0.0000 A4 = 4.0579e-005 A6 = 4.7325e-009 A8 = 2.0580e-009 A10=-5.5734e-013 A12= 0.0000 ズームデータ f(mm) 39.240 74.386 150.490 FNO 5.199 9.249 13.081 2ω(°) 56.1 32.0 16.3 FB(mm) 7.253 36.422 99.583 D1 15.865 7.470 2.730Example 9 r 1 = 51.587 (aspherical surface) d 1 = 1.200 n 1 = 1.84666 ν 1 = 23.78 r 2 = 35.082 d 2 = 6.196 r 3 = 67032.480 (aspherical surface) d 3 = 4.538 n 2 = 1.48749 ν 2 = 70.23 r 4 = -12.296 (aspherical surface) d 4 = 0.500 r 5 = INF d 5 = D1 r 6 = 133.140 (aspherical surface) d 6 = 1.300 n 3 = 1.80610 ν 3 = 40.92 r 7 = 66.082 d 7 = 0.975 r 8 = -191.803 d 8 = 2.200 n 4 = 1.80518 ν 4 = 25.42 r 9 = -78.635 d 9 = 5.927 r 10 = -10.737 d 10 = 1.000 n 5 = 1.69680 ν 5 = 55.53 r 11 = -30.399 Aperture surface 5 Aspheric coefficient First surface k = 0.0000 A 4 = -6.8156e-005 A 6 = -3.8295e-007 A 8 = -1.0476e-009 A 10 = -2.6471e-011 A 12 = 0.0000 3rd surface k = 0.0000 A 4 = -9.0861e-006 A 6 = -1.2445e-006 A 8 = 3.5837e-008 A 10 = -8.9054e-010 A 12 = 0.0000 4th surface k = 0.0000 A 4 = 1.1350e-005 A 6 = -8.1167e-007 A 8 = 2.0180e-008 A 10 = -5.0173e-010 A 12 = 0.0000 Surface 6 k = 0.0000 A 4 = 4.0579e-005 A 6 = 4.7325e -009 A 8 = 2.0580e-009 A 10 = -5.5734e-013 A 12 = 0.0000 Zoom data f (m m) 39.240 74.386 150.490 F NO 5.199 9.249 13.081 2ω (°) 56.1 32.0 16.3 FB (mm) 7.253 36.422 99.583 D1 15.865 7.470 2.730
【0105】 (実施例10) r1 =1324.221(非球面)d1 =1.200 n1=1.84666 ν1=23.78 r2 = 83.191 d2 =5.657 r3 = 23.202(非球面)d3 =7.147 n2=1.48749 ν2=70.23 r4 = -18.660(非球面)d4 =0.600 r5 =INF d5 =D1 r6 =-110.497(非球面)d6 =4.401 n3=1.58423 ν3=30.49 r7 = -21.993(非球面)d7 =1.891 r8 = -18.131 d8 =0.820 n4=1.77250 ν4=49.60 r9 = 142.753(非球面)d9 =D2 r10= -11.379 d10=1.000 n5=1.72916 ν5=54.68 r11= -19.539 絞り面 5 非球面係数 第1面 k = 0.0000 A4 =-6.5407e-005 A6 =-1.8351e-007 A8 = 3.6790e-010 A10=-6.0018e-013 A12= 0.0000 第3面 k = 0.0000 A4 = 1.0216e-004 A6 = 5.3543e-007 A8 =-2.1427e-010 A10= 4.3684e-011 A12= 0.0000 第4面 k = 0.0000 A4 = 9.3684e-005 A6 = 6.5275e-007 A8 = 6.6760e-009 A10=-5.2586e-011 A12= 0.0000 第6面 k = 0.0000 A4 = 1.2967e-004 A6 =-2.3252e-007 A8 = 3.8509e-008 A10=-6.1610e-010 A12= 0.0000 第7面 k = 0.0000 A4 = 2.8294e-004 A6 =-2.1285e-006 A8 = 7.8906e-008 A10=-8.0943e-010 A12= 0.0000 第9面 k = 0.0000 A6 = 2.0588e-006 A8 =-3.0508e-008 A10= 1.7406e-010 A12= 0.0000 ズームデータ 広角端 中間 望遠端 f(mm) 39.101 72.374 156.257 FNO 5.628 9.588 12.841 2ω(°) 55.6 32.5 15.7 FB(mm) 6.458 27.027 84.665 D1 11.257 4.128 0.600 D2 5.076 9.617 9.915Example 10 r 1 = 1324.221 (aspheric surface) d 1 = 1.200 n 1 = 1.84666 ν 1 = 23.78 r 2 = 83.191 d 2 = 5.657 r 3 = 23.202 (aspheric surface) d 3 = 7.147 n 2 = 1.48749 ν 2 = 70.23 r 4 = -18.660 (aspheric) d 4 = 0.600 r 5 = INF d 5 = D1 r 6 = -110.497 (aspheric) d 6 = 4.401 n 3 = 1.58423 ν 3 = 30.49 r 7 = -21.993 (aspheric surface) d 7 = 1.891 r 8 = -18.131 d 8 = 0.820 n 4 = 1.777250 ν 4 = 49.60 r 9 = 142.753 (aspheric surface) d 9 = D2 r 10 = -11.379 d 10 = 1.000 n 5 = 1.72916 ν 5 = 54.68 r 11 = -19.539 Aperture surface 5 Aspherical surface first surface k = 0.0000 A 4 = -6.5407e-005 A 6 = -1.8351e-007 A 8 = 3.6790e-010 A 10 = -6.0018e-013 A 12 = 0.0000 3rd surface k = 0.0000 A 4 = 1.0216e-004 A 6 = 5.3543e-007 A 8 = -2.1427e-010 A 10 = 4.3684e-011 A 12 = 0.0000 4th Surface k = 0.0000 A 4 = 9.3684e-005 A 6 = 6.5275e-007 A 8 = 6.6760e-009 A 10 = -5.2586e-011 A 12 = 0.0000 Surface 6 k = 0.0000 A 4 = 1.2967e-004 A 6 = -2.3252e-007 A 8 = 3.8509e-008 A 10 = -6.1610e-010 A 12 = 0.0000 7th Surface k = 0.0000 A 4 = 2.8294e-004 A 6 = -2.1285e-006 A 8 = 7.8906e-008 A 10 = -8.0943e-010 A 12 = 0.0000 Surface 9 k = 0.0000 A 6 = 2.0588 e-006 A 8 = -3.0508e-008 A 10 = 1.7406e-010 A 12 = 0.0000 Zoom data Wide angle end Middle telephoto end f (mm) 39.101 72.374 156.257 F NO 5.628 9.588 12.841 2ω (°) 55.6 32.5 15.7 FB ( mm) 6.458 27.027 84.665 D1 11.257 4.128 0.600 D2 5.076 9.617 9.915
【0106】 (実施例11) r1 =-138.527(非球面)d1 =1.200 n1=1.84666 ν1=23.78 r2 =1051.531 d2 =4.123 r3 = 31.953(非球面)d3 =7.310 n2=1.48749 ν1=70.23 r4 = -16.206(非球面)d4 =0.450 r5 =INF d5 =D1 r6 = -76.487(非球面)d6 =6.921 n3=1.58423 ν1=30.49 r7 = -23.873 d7 =2.179 r8 = -13.985 d8 =0.989 n4=1.77250 ν1=49.60 r9 = -45.055(非球面)d9 =D2 r10= -13.273 d10=1.000 n5=1.72916 ν1=54.68 r11= -35.127 絞り面 5 非球面係数 第1面 k = 0.0000 A4 =-9.5528e-005 A6 =-1.5423e-007 A8 =-3.6986e-009 A10= 6.6419e-011 A12=-4.0574e-013 第3面 k = 0.0000 A4 = 1.6097e-004 A6 = 3.1557e-007 A8 = 1.2419e-008 A10=-1.5818e-010 A12= 1.9274e-012 第4面 k = 0.0000 A4 = 1.1140e-004 A6 = 5.7295e-007 A8 = 2.7356e-008 A10=-5.2204e-010 A12= 7.7406e-012 第6面 k = 0.0000 A4 = 4.2329e-005 A6 = 3.6554e-007 A8 =-5.1270e-009 A10= 9.2108e-011 A12=-4.0087e-013 第9面 k = 0.0000 A6 =-6.9621e-008 A8 = 2.5785e-009 A10=-3.7926e-011 A12= 1.5918e-013 ズームデータ 広角端 中間 望遠端 f(mm) 39.109 73.897 153.999 FNO 5.626 9.782 12.586 2ω(°) 55.7 31.7 15.9 FB(mm) 6.818 27.073 81.028 D1 10.778 2.983 0.500 D2 3.328 8.762 7.127(Example 11) r 1 = -138.527 (aspherical surface) d 1 = 1.200 n 1 = 1.84666 ν 1 = 23.78 r 2 = 1051.531 d 2 = 4.123 r 3 = 31.953 (aspherical surface) d 3 = 7.310 n 2 = 1.48749 ν 1 = 70.23 r 4 = -16.206 (aspheric surface) d 4 = 0.450 r 5 = INF d 5 = D1 r 6 = -76.487 (aspheric surface) d 6 = 6.921 n 3 = 1.58423 ν 1 = 30.49 r 7 = -23.873 d 7 = 2.179 r 8 = -13.985 d 8 = 0.989 n 4 = 1.77250 ν 1 = 49.60 r 9 = -45.055 (aspheric) d 9 = D2 r 10 = -13.273 d 10 = 1.000 n 5 = 1.72916 ν 1 = 54.68 r 11 = -35.127 Aperture surface 5 Aspheric coefficient First surface k = 0.0000 A 4 = -9.5528e-005 A 6 = -1.5423e-007 A 8 = -3.6986e-009 A 10 = 6.6419 e-011 A 12 = -4.0574e-013 Surface 3 k = 0.0000 A 4 = 1.6097e-004 A 6 = 3.1557e-007 A 8 = 1.2419e-008 A 10 = -1.5818e-010 A 12 = 1.9274 e-012 4th surface k = 0.0000 A 4 = 1.1140e-004 A 6 = 5.7295e-007 A 8 = 2.7356e-008 A 10 = -5.2204e-010 A 12 = 7.7406e-012 6th surface k = 0.0000 A 4 = 4.2329e-005 A 6 = 3.6554e-007 A 8 = -5.1270e-009 A 10 = 9.2108e-011 A 12 = -4.0087e -013 9th surface k = 0.0000 A 6 = -6.9621e-008 A 8 = 2.5785e-009 A 10 = -3.7926e-011 A 12 = 1.5918e-013 Zoom data Wide-angle end Middle Telephoto end f (mm ) 39.109 73.897 153.999 F NO 5.626 9.782 12.586 2ω (°) 55.7 31.7 15.9 FB (mm) 6.818 27.073 81.028 D1 10.778 2.983 0.500 D2 3.328 8.762 7.127
【0107】 (実施例12) r1 = -82.807(非球面)d1 =1.200 n1=1.84666 ν1=23.78 r2 =1875.085 d2 =5.030 r3 = 20.948(非球面)d3 =9.430 n2=1.48749 ν2=70.23 r4 = -20.451(非球面)d4 =0.499 r5 =INF d5 =D1 r6 = -48.096(非球面)d6 =5.501 n3=1.58423 ν3=30.49 r7 = -15.456(非球面)d7 =2.164 r8 = -15.093 d8 =0.820 n4=1.77250 ν4=49.60 r9 = 110.201(非球面)d9 =D2 r10= -23.399 d10=1.000 n5=1.72916 ν5=54.68 r11= -94.479 絞り面 5 非球面係数 第1面 k = 0.0000 A4 =-6.4726e-005 A6 =-1.0710e-007 A8 = 8.1624e-010 A10= 1.7228e-013 A12= 0.0000 第3面 k = 0.0000 A4 = 1.1803e-004 A6 = 2.3861e-007 A8 =-6.7360e-010 A10= 2.6468e-011 A12= 0.0000 第4面 k = 0.0000 A4 = 1.1663e-004 A6 = 5.6512e-007 A8 = 1.6480e-008 A10=-1.0479e-010 A12= 0.0000 第6面 k = 0.0000 A4 = 7.9235e-005 A6 = 3.6165e-007 A8 = 3.1862e-008 A10=-2.6881e-010 A12=-1.0579e-012 第7面 k = 0.0000 A4 = 2.6119e-004 A6 =-1.3815e-006 A8 = 4.5428e-008 A10=-5.4867e-011 A12=-2.0268e-012 第9面 k = 0.0000 A4 =-2.0086e-004 A6 = 2.4126e-006 A8 =-3.5520e-008 A10= 2.5944e-010 A12=-8.0358e-013 ズームデータ 広角端 中間 望遠端 f(mm) 39.002 83.899 180.685 FNO 5.665 10.890 14.414 2ω(°) 54.6 27.8 13.5 FB(mm) 6.756 18.940 80.585 D1 13.240 1.824 0.600 D2 1.742 24.703 16.181 次に、上記各実施例における条件の値を、表1と表2に
示す。
Example 12 r 1 = −82.807 (aspherical surface) d 1 = 1.200 n 1 = 1.84666 ν 1 = 23.78 r 2 = 1875.085 d 2 = 5.030 r 3 = 20.948 (aspherical surface) d 3 = 9.430 n 2 = 1.48749 ν 2 = 70.23 r 4 = -20.451 (aspherical surface) d 4 = 0.499 r 5 = INF d 5 = D1 r 6 = -48.096 (aspherical surface) d 6 = 5.501 n 3 = 1.58423 ν 3 = 30.49 r 7 = -15.456 (aspheric surface) d 7 = 2.164 r 8 = -15.093 d 8 = 0.820 n 4 = 1.77250 ν 4 = 49.60 r 9 = 110.201 (aspheric surface) d 9 = D2 r 10 = -23.399 d 10 = 1.000 n 5 = 1.72916 ν 5 = 54.68 r 11 = -94.479 Aperture surface 5 Aspherical surface first surface k = 0.0000 A 4 = -6.4726e-005 A 6 = -1.0710e-007 A 8 = 8.1624e-010 A 10 = 1.7228e-013 A 12 = 0.0000 Surface 3 k = 0.0000 A 4 = 1.1803e-004 A 6 = 2.3861e-007 A 8 = -6.7360e-010 A 10 = 2.6468e-011 A 12 = 0.0000 4th Surface k = 0.0000 A 4 = 1.1663e-004 A 6 = 5.6512e-007 A 8 = 1.6480e-008 A 10 = -1.0479e-010 A 12 = 0.0000 Surface 6 k = 0.0000 A 4 = 7.9235e-005 A 6 = 3.6165e-007 A 8 = 3.1862e-008 A 10 = -2.6881e-010 A 12 = -1.0579e-012 Surface 7 k = 0.0000 A 4 = 2.6119e-004 A 6 = -1.3815e-006 A 8 = 4.5428e-008 A 10 = -5.4867e-011 A 12 = -2.0268e-012 Surface 9 k = 0.0000 A 4 = -2.0086e-004 A 6 = 2.4126e-006 A 8 = -3.5520e-008 A 10 = 2.5944e-010 A 12 = -8.0358e-013 Zoom data Wide-angle end Middle Telephoto end f (mm) 39.002 83.899 180.685 F NO 5.665 10.890 14.414 2ω (°) 54.6 27.8 13.5 FB (mm) 6.756 18.940 80.585 D1 13.240 1.824 0.600 D2 1.742 24.703 16.181 Next, Tables 1 and 2 show the values of the conditions in the above Examples.
【0108】[0108]
【表1】 [Table 1]
【0109】[0109]
【表2】 なお、本発明のズームレンズは、以下のように構成する
ことができる。
[Table 2] The zoom lens according to the present invention can be configured as follows.
【0110】[1]物体側より順に、正屈折力の第1群
と、明るさ絞りと、負屈折力の第2群で構成され、前記
正屈折力の第1群は負レンズと正レンズで構成され、前
記負屈折力の第2群は正レンズと負レンズで構成され、
条件(1)を満足することを特徴としたズームレンズ。
[1] In order from the object side, the first lens unit includes a first lens unit having a positive refractive power, a brightness stop, and a second lens unit having a negative refractive power. The first lens unit having the positive refractive power includes a negative lens and a positive lens. Wherein the second group of negative refracting power comprises a positive lens and a negative lens,
A zoom lens characterized by satisfying the condition (1).
【0111】(1) 3<ft/fw<5 ただし、ftは望遠端の焦点距離、fwは広角端の焦点
距離である。 [2]物体側より順に、正屈折力の第1群と、明るさ絞
りと、負屈折力の第2群で構成され、前記正屈折力の第
1群は負レンズと正レンズで構成され、前記負屈折力の
第2群は合成屈折力が正となる2枚のレンズと負レンズ
で構成され、条件(1)を満足することを特徴としたズ
ームレンズ。
(1) 3 <ft / fw <5 where ft is the focal length at the telephoto end and fw is the focal length at the wide-angle end. [2] In order from the object side, the first lens unit includes a first group having a positive refractive power, a brightness stop, and a second group having a negative refractive power.
The first unit includes a negative lens and a positive lens, and the second unit having the negative refractive power includes two lenses having a positive combined refractive power and a negative lens, and satisfies the condition (1). Zoom lens.
【0112】(1) 3<ft/fw<5 ただし、ftは望遠端の焦点距離、fwは広角端の焦点
距離である。 [3]物体側より順に、正屈折力の第1群と、負屈折力
の第2群と、負屈折力の第3群で構成され、条件(2)
を満足することを特徴としたズームレンズ。
(1) 3 <ft / fw <5 where ft is the focal length at the telephoto end, and fw is the focal length at the wide-angle end. [3] In order from the object side, the first lens unit includes a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a third lens unit having a negative refractive power.
A zoom lens characterized by satisfying
【0113】(2) 2.5<ft/fw<5.5 ただし、ftは望遠端の焦点距離、fwは広角端の焦点
距離である。 [4]物体側より順に、正屈折力の第1群と、負屈折力
の第2群と、負屈折力の第3群で構成され、いずれの群
も変倍時に可動であり、前記正屈折力の第1群は負レン
ズと正レンズで構成され、前記負屈折力の第2群は正レ
ンズと負レンズで構成され、前記負屈折力の第3群は負
レンズ1枚で構成されたことを特徴としたズームレン
ズ。
(2) 2.5 <ft / fw <5.5 where ft is the focal length at the telephoto end and fw is the focal length at the wide-angle end. [4] In order from the object side, the first lens unit includes a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a third lens unit having a negative refractive power. The first group of refractive power is composed of a negative lens and a positive lens, the second group of negative refractive power is composed of a positive lens and a negative lens, and the third group of negative refractive power is composed of one negative lens. Zoom lens characterized by that.
【0114】[5]物体側より順に、正屈折力の第1群
と、明るさ絞りと、負屈折力の第2群で構成され、前記
正屈折力の第1群は負レンズと正レンズで構成され、前
記負屈折力の第2群は正レンズと負レンズで構成され、
前記負屈折力の第2群を像面側に移動させて至近物体へ
のフォーカシングを行なうことを特徴としたズームレン
ズ。
[5] In order from the object side, the first lens unit includes a first lens unit having a positive refractive power, a brightness stop, and a second lens unit having a negative refractive power. The first lens unit having the positive refractive power includes a negative lens and a positive lens. Wherein the second group of negative refracting power comprises a positive lens and a negative lens,
A zoom lens, wherein the second lens unit having the negative refractive power is moved to an image plane side to perform focusing on a close object.
【0115】[6]物体側より順に、正屈折力の第1群
と、明るさ絞りと、負屈折力の第2群で構成され、前記
正屈折力の第1群は負レンズと正レンズで構成され、前
記負屈折力の第2群は正レンズと負レンズで構成され、
前記正屈折力の第1群の正レンズが両面非球面の形状を
有していることを特徴としたズームレンズ。
[6] In order from the object side, the first lens unit includes a first lens unit having a positive refractive power, a brightness stop, and a second lens unit having a negative refractive power. The first lens unit having the positive refractive power includes a negative lens and a positive lens. Wherein the second group of negative refracting power comprises a positive lens and a negative lens,
A zoom lens, wherein the first group of positive lenses having a positive refractive power has an aspherical shape on both surfaces.
【0116】[7]以下の条件(3)を満足することを
特徴とする[1]乃至[6]のズームレンズ。 (3) 0.5<Lt/ft<1.0 ただし、Ltはテレ側のレンズ全長、ftはテレ側の焦
点距離である。
[7] The zoom lens of [1] to [6], wherein the following condition (3) is satisfied. (3) 0.5 <Lt / ft <1.0 where Lt is the total lens length on the telephoto side, and ft is the focal length on the telephoto side.
【0117】[8]第1群に少なくとも1枚の非球面を用
いたことを特徴とする[1]乃至[7]のズームレン
ズ。 [9]第1群の正レンズが両面非球面の形状であること
を特徴とする[8]のズームレンズ。 [10]以下の条件(1)を満足することを特徴とする
[3]乃至[6]のズームレンズ。
[8] The zoom lens of any one of [1] to [7], wherein at least one aspherical surface is used in the first lens unit. [9] The zoom lens of [8], wherein the first group of positive lenses has an aspheric surface on both sides. [10] The zoom lens of [3] to [6], wherein the following condition (1) is satisfied.
【0118】(1) 3<ft/fw<5 ただし、ftは望遠端の焦点距離、fwは広角端の焦点
距離である。 [11]以下の条件(4)を満足することを特徴とする
[4]乃至[6]のズームレンズ。
(1) 3 <ft / fw <5 where ft is the focal length at the telephoto end, and fw is the focal length at the wide-angle end. [11] The zoom lens of [4] to [6], wherein the following condition (4) is satisfied.
【0119】(4) 0.08<f1/ft<0.35 ここで、f1は第1群の焦点距離、ftは望遠端の焦点
距離である。 [12]以下の条件(5)を満足することを特徴とする
[1]、[2]、[5]、[6]のズームレンズ。
(4) 0.08 <f1 / ft <0.35 Here, f1 is the focal length of the first lens unit, and ft is the focal length at the telephoto end. [12] The zoom lens of [1], [2], [5], or [6], which satisfies the following condition (5).
【0120】(5) −0.3<f22/ft<−0.
05 ここで、f22は2群ズームレンズの第2群の焦点距
離、ftは望遠端の焦点距離である。
(5) -0.3 <f22 / ft <-0.
05 Here, f22 is the focal length of the second group of the two-unit zoom lens, and ft is the focal length at the telephoto end.
【0121】[0121]
【発明の効果】以上の説明から明らかなように、本発明
によると、物体側から順に、物体側より順に、正屈折力
の第1群と負屈折力の第2群で構成され2群ズームレン
ズ、あるいは物体側から順に、正屈折力の第1群と負屈
折力の第2群と負屈折力の第3群で構成され3群ズーム
レンズにおいて、少ないレンズ枚数で高い変倍比を有す
るズームレンズを提供することができる。
As is apparent from the above description, according to the present invention, a two-unit zoom system is constituted by a first unit having a positive refractive power and a second unit having a negative refractive power in order from the object side and sequentially from the object side. A three-unit zoom lens composed of a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a third lens unit having a negative refractive power in order from the lens or the object side, and has a high zoom ratio with a small number of lenses. A zoom lens can be provided.
【図面の簡単な説明】[Brief description of the drawings]
【図1】本発明のズームレンズの概念図であって、望遠
端におけるズームレンズと鏡枠の様子を示す図である。
FIG. 1 is a conceptual diagram of a zoom lens according to the present invention, showing a state of a zoom lens and a lens frame at a telephoto end.
【図2】本発明の実施例1であって、(a)広角端、(b)中
間位置、(c)望遠位置のレンズ断面図である。
FIG. 2 is a lens cross-sectional view of Example 1 of the present invention, showing (a) a wide-angle end, (b) an intermediate position, and (c) a telephoto position.
【図3】本発明の実施例2であって、(a)広角端、(b)中
間位置、(c)望遠位置のレンズ断面図である。
FIG. 3 is a lens cross-sectional view of Example 2 of the present invention, showing (a) a wide-angle end, (b) an intermediate position, and (c) a telephoto position.
【図4】本発明の実施例3であって、(a)広角端、(b)中
間位置、(c)望遠位置のレンズ断面図である。
FIG. 4 is a lens cross-sectional view of Example 3 of the present invention, showing (a) a wide-angle end, (b) an intermediate position, and (c) a telephoto position.
【図5】本発明の実施例4であって、(a)広角端、(b)中
間位置、(c)望遠位置のレンズ断面図である。
FIG. 5 is a lens cross-sectional view of Example 4 of the present invention, showing (a) a wide-angle end, (b) an intermediate position, and (c) a telephoto position.
【図6】本発明の実施例5であって、(a)広角端、(b)中
間位置、(c)望遠位置のレンズ断面図である。
FIG. 6 is a lens cross-sectional view of Example 5 of the present invention, showing (a) a wide-angle end, (b) an intermediate position, and (c) a telephoto position.
【図7】本発明の実施例6であって、(a)広角端、(b)中
間位置、(c)望遠位置のレンズ断面図である。
FIG. 7 is a lens cross-sectional view of Example 6 of the present invention, showing (a) a wide-angle end, (b) an intermediate position, and (c) a telephoto position.
【図8】本発明の実施例7であって、(a)広角端、(b)中
間位置、(c)望遠位置のレンズ断面図である。
FIG. 8 is a sectional view of a lens according to a seventh embodiment of the present invention, showing (a) a wide-angle end, (b) an intermediate position, and (c) a telephoto position.
【図9】本発明の実施例8であって、(a)広角端、(b)中
間位置、(c)望遠位置のレンズ断面図である。
FIG. 9 is a lens cross-sectional view of Example 8 of the present invention, showing (a) a wide-angle end, (b) an intermediate position, and (c) a telephoto position.
【図10】本発明の実施例9であって、(a)広角端、(b)
中間位置、(c)望遠位置のレンズ断面図である。
FIG. 10 is a view illustrating a ninth embodiment of the present invention, in which (a) a wide-angle end and (b)
FIG. 5 is a lens cross-sectional view at an intermediate position and (c) a telephoto position.
【図11】本発明の実施例10であって、(a)広角端、
(b)中間位置、(c)望遠位置のレンズ断面図である。
FIG. 11 is a view illustrating a tenth embodiment of the present invention, in which (a) a wide-angle end;
FIG. 3B is a lens cross-sectional view at an intermediate position and at a telephoto position.
【図12】本発明の実施例11であって、(a)広角端、
(b)中間位置、(c)望遠位置のレンズ断面図である。
FIG. 12 shows Embodiment 11 of the present invention, in which (a) a wide-angle end;
FIG. 3B is a lens cross-sectional view at an intermediate position and at a telephoto position.
【図13】本発明の実施例12であって、(a)広角端、
(b)中間位置、(c)望遠位置のレンズ断面図である。
FIG. 13 is a view illustrating a twelfth embodiment of the present invention, in which (a) a wide-angle end;
FIG. 3B is a lens cross-sectional view at an intermediate position and at a telephoto position.
【図14】本発明の実施例1であって、(a)広角端、(b)
中間位置、(c)望遠位置における収差図である。
FIG. 14 is a first embodiment of the present invention, wherein (a) a wide-angle end, and (b)
It is an aberration figure in an intermediate position and (c) a telephoto position.
【図15】本発明の実施例2であって、(a)広角端、(b)
中間位置、(c)望遠位置の収差図である。
FIG. 15 is a second embodiment of the present invention, wherein (a) a wide-angle end, and (b)
It is an aberration figure of an intermediate position and (c) a telephoto position.
【図16】本発明の実施例3であって、(a)広角端、(b)
中間位置、(c)望遠位置の収差図である。
FIG. 16 is a diagram illustrating a third embodiment of the present invention, in which (a) a wide-angle end and (b)
It is an aberration figure of an intermediate position and (c) a telephoto position.
【図17】本発明の実施例4であって、(a)広角端、(b)
中間位置、(c)望遠位置の収差図である。
FIG. 17 is a fourth embodiment of the present invention, wherein (a) a wide-angle end, and (b)
It is an aberration figure of an intermediate position and (c) a telephoto position.
【図18】本発明の実施例5であって、(a)広角端、(b)
中間位置、(c)望遠位置の収差図である。
FIG. 18 is a view showing a fifth embodiment of the present invention, in which (a) a wide-angle end, and (b)
It is an aberration figure of an intermediate position and (c) a telephoto position.
【図19】本発明の実施例6であって、(a)広角端、(b)
中間位置、(c)望遠位置の収差図である。
FIG. 19 is a view illustrating a sixth embodiment of the present invention, in which (a) a wide-angle end and (b)
It is an aberration figure of an intermediate position and (c) a telephoto position.
【図20】本発明の実施例7であって、(a)広角端、(b)
中間位置、(c)望遠位置の収差図である。
FIG. 20 shows a seventh embodiment of the present invention, wherein (a) a wide-angle end, and (b)
It is an aberration figure of an intermediate position and (c) a telephoto position.
【図21】本発明の実施例8であって、(a)広角端、(b)
中間位置、(c)望遠位置の収差図である。
FIG. 21 shows Example 8 of the present invention, in which (a) a wide-angle end, and (b)
It is an aberration figure of an intermediate position and (c) a telephoto position.
【図22】本発明の実施例9であって、(a)広角端、(b)
中間位置、(c)望遠位置の収差図である。
FIG. 22 is a view illustrating a ninth embodiment of the present invention, in which (a) a wide-angle end and (b)
It is an aberration figure of an intermediate position and (c) a telephoto position.
【図23】本発明の実施例10であって、(a)広角端、
(b)中間位置、(c)望遠位置の収差図である。
FIG. 23 is a view illustrating a tenth embodiment of the present invention, in which (a) a wide-angle end;
It is an aberration figure of (b) an intermediate position and (c) a telephoto position.
【図24】本発明の実施例11であって、(a)広角端、
(b)中間位置、(c)望遠位置の収差図である。
FIG. 24 shows Embodiment 11 of the present invention, in which (a) a wide-angle end;
It is an aberration figure of (b) an intermediate position and (c) a telephoto position.
【図25】本発明の実施例12であって、(a)広角端、
(b)中間位置、(c)望遠位置の収差図である。
FIG. 25 is a view illustrating a twelfth embodiment of the present invention, in which (a) a wide-angle end;
It is an aberration figure of (b) an intermediate position and (c) a telephoto position.
【符号の説明】[Explanation of symbols]
1 ズームレンズ 2 鏡枠 3 軸外主光線 4 光軸 IH 像高 Lt 望遠端のレンズ全長 DESCRIPTION OF SYMBOLS 1 Zoom lens 2 Lens frame 3 Off-axis principal ray 4 Optical axis IH Image height Lt Overall length of lens at telephoto end

Claims (4)

    【特許請求の範囲】[Claims]
  1. 【請求項1】 物体側より順に、正屈折力の第1群と、
    明るさ絞りと、負屈折力の第2群で構成され、前記正屈
    折力の第1群は負レンズと正レンズで構成され、前記負
    屈折力の第2群は正レンズと負レンズで構成され、条件
    (1)を満足することを特徴としたズームレンズ。 (1) 3<ft/fw<5 ただし、ftは望遠端の焦点距離、fwは広角端の焦点
    距離である。
    1. A first group having a positive refractive power, in order from the object side,
    The aperture stop comprises a second group having a negative refractive power, the first group having a positive refractive power comprises a negative lens and a positive lens, and the second group having a negative refractive power comprises a positive lens and a negative lens. And a zoom lens characterized by satisfying the condition (1). (1) 3 <ft / fw <5 where ft is the focal length at the telephoto end, and fw is the focal length at the wide-angle end.
  2. 【請求項2】 物体側より順に、正屈折力の第1群と、
    明るさ絞りと、負屈折力の第2群で構成され、前記正屈
    折力の第1群は負レンズと正レンズで構成され、前記負
    屈折力の第2群は合成屈折力が正となる2枚のレンズと
    負レンズで構成され、条件(1)を満足することを特徴
    としたズームレンズ。 (1) 3<ft/fw<5 ただし、ftは望遠端の焦点距離、fwは広角端の焦点
    距離である。
    2. A first group having a positive refractive power, in order from the object side,
    The aperture stop and the second group having a negative refractive power are formed. The first group having the positive refractive power is formed with a negative lens and a positive lens. The second group having the negative refractive power has a positive combined refractive power. A zoom lens comprising two lenses and a negative lens, and satisfying a condition (1). (1) 3 <ft / fw <5 where ft is the focal length at the telephoto end, and fw is the focal length at the wide-angle end.
  3. 【請求項3】 物体側より順に、正屈折力の第1群と、
    負屈折力の第2群と、負屈折力の第3群で構成され、条
    件(2)を満足することを特徴としたズームレンズ。 (2) 2.5<ft/fw<5.5 ただし、ftは望遠端の焦点距離、fwは広角端の焦点
    距離である。
    3. A first group of positive refractive power, in order from the object side,
    A zoom lens comprising a second group having a negative refractive power and a third group having a negative refractive power, wherein the zoom lens satisfies the condition (2). (2) 2.5 <ft / fw <5.5 where ft is the focal length at the telephoto end, and fw is the focal length at the wide-angle end.
  4. 【請求項4】 物体側より順に、正屈折力の第1群と、
    負屈折力の第2群と、負屈折力の第3群で構成され、い
    ずれの群も変倍時に可動であり、前記正屈折力の第1群
    は負レンズと正レンズで構成され、前記負屈折力の第2
    群は正レンズと負レンズで構成され、前記負屈折力の第
    3群は負レンズ1枚で構成されたことを特徴としたズー
    ムレンズ。
    4. A first group having a positive refractive power, in order from the object side,
    A second group having a negative refractive power and a third group having a negative refractive power, each of which is movable at the time of zooming; the first group having a positive refractive power includes a negative lens and a positive lens; Second with negative refractive power
    A zoom lens, wherein the group includes a positive lens and a negative lens, and the third group having the negative refractive power includes a single negative lens.
JP2000176837A 2000-06-13 2000-06-13 Zoom lens Pending JP2001356266A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000176837A JP2001356266A (en) 2000-06-13 2000-06-13 Zoom lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000176837A JP2001356266A (en) 2000-06-13 2000-06-13 Zoom lens

Publications (1)

Publication Number Publication Date
JP2001356266A true JP2001356266A (en) 2001-12-26

Family

ID=18678511

Family Applications (1)

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

Country Link
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002107621A (en) * 2000-10-02 2002-04-10 Asahi Optical Co Ltd Zoom lens system
JP2011085862A (en) * 2009-10-19 2011-04-28 Optical Logic Inc Imaging lens
WO2014192507A1 (en) * 2013-05-30 2014-12-04 オリンパス株式会社 Zoom lens and image capture device comprising same
WO2016084117A1 (en) * 2014-11-28 2016-06-02 株式会社ニコン Imaging lens and imaging device
US10488633B2 (en) 2015-01-09 2019-11-26 Nikon Corporation Imaging lens and image capturing device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04264413A (en) * 1991-02-19 1992-09-21 Minolta Camera Co Ltd Compact zoom lens
JPH0593864A (en) * 1991-04-09 1993-04-16 Konica Corp Zoom lens
JPH09133863A (en) * 1995-11-08 1997-05-20 Olympus Optical Co Ltd Variable power lens
JPH09179025A (en) * 1995-12-22 1997-07-11 Olympus Optical Co Ltd High variable power ratio zoom lens
JPH09197274A (en) * 1996-01-16 1997-07-31 Minolta Co Ltd Zoom lens
JPH11295598A (en) * 1998-04-10 1999-10-29 Olympus Optical Co Ltd Zoom lens using diffraction optical element

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04264413A (en) * 1991-02-19 1992-09-21 Minolta Camera Co Ltd Compact zoom lens
JPH0593864A (en) * 1991-04-09 1993-04-16 Konica Corp Zoom lens
JPH09133863A (en) * 1995-11-08 1997-05-20 Olympus Optical Co Ltd Variable power lens
JPH09179025A (en) * 1995-12-22 1997-07-11 Olympus Optical Co Ltd High variable power ratio zoom lens
JPH09197274A (en) * 1996-01-16 1997-07-31 Minolta Co Ltd Zoom lens
JPH11295598A (en) * 1998-04-10 1999-10-29 Olympus Optical Co Ltd Zoom lens using diffraction optical element

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002107621A (en) * 2000-10-02 2002-04-10 Asahi Optical Co Ltd Zoom lens system
JP2011085862A (en) * 2009-10-19 2011-04-28 Optical Logic Inc Imaging lens
WO2014192507A1 (en) * 2013-05-30 2014-12-04 オリンパス株式会社 Zoom lens and image capture device comprising same
JP5977888B2 (en) * 2013-05-30 2016-08-24 オリンパス株式会社 Zoom lens and image pickup apparatus including the same
JPWO2014192507A1 (en) * 2013-05-30 2017-02-23 オリンパス株式会社 Zoom lens and image pickup apparatus including the same
US9588324B2 (en) 2013-05-30 2017-03-07 Olympus Corporation Zoom lens and image pickup apparatus using the same
WO2016084117A1 (en) * 2014-11-28 2016-06-02 株式会社ニコン Imaging lens and imaging device
JPWO2016084117A1 (en) * 2014-11-28 2017-09-21 株式会社ニコン Imaging lens and imaging apparatus
US10488633B2 (en) 2015-01-09 2019-11-26 Nikon Corporation Imaging lens and image capturing device

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