JPH0239011A - Aspherical zoom lens - Google Patents
Aspherical zoom lensInfo
- Publication number
- JPH0239011A JPH0239011A JP63189024A JP18902488A JPH0239011A JP H0239011 A JPH0239011 A JP H0239011A JP 63189024 A JP63189024 A JP 63189024A JP 18902488 A JP18902488 A JP 18902488A JP H0239011 A JPH0239011 A JP H0239011A
- Authority
- JP
- Japan
- Prior art keywords
- group
- lens
- refractive power
- zoom lens
- aspherical
- 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
Links
- 230000003287 optical effect Effects 0.000 claims abstract description 8
- 230000000694 effects Effects 0.000 claims description 4
- 230000005499 meniscus Effects 0.000 claims description 3
- 230000014509 gene expression Effects 0.000 abstract description 2
- 230000004075 alteration Effects 0.000 description 18
- 238000010586 diagram Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 201000009310 astigmatism Diseases 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
- G02B15/1441—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive
- G02B15/144105—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive arranged +-+-
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は非球面ズームレンズに関するものであ従来の技
術
最近のビデオカメラは操作性、ｉ動性とともに高画質が
要望され、それに答えて撮像デバイスも１．２７ｓｖ＋
（１／２インチ）の小型で、かつ高解像変のものが主流
になりつつある。また、それにともない、大口径比・小
型軽量でかつ高性能なズームレンズが強く要望されてい
る。さらに、コスト低減の要望も強く、高性能を維持し
つつ、構成枚数の削減をはかったズームレンズの実現が
強くせまられている。Ｆナンバーが約１．２．ズーム比
が約６倍程度の従来のズームレンズは１３枚以上のレン
ズで構成されている。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an aspherical zoom lens.Prior Art Recent video cameras are required to have high image quality as well as operability and i-motion. 1.27sv+
Small (1/2 inch) high-resolution devices are becoming mainstream. In addition, with this trend, there is a strong demand for zoom lenses that have a large aperture ratio, are compact, lightweight, and have high performance. Furthermore, there is a strong desire to reduce costs, and there is a strong need to realize a zoom lens that reduces the number of lenses while maintaining high performance. F number is about 1.2. A conventional zoom lens with a zoom ratio of about 6 times is composed of 13 or more lenses.
以下、図面を参照しながら、上述した従来のビデオカメ
ラ用ズームレンズの一例について説明する（例えば、特
願昭６２−８５０１９号）第２図は従来のビデオカメラ
用ズームレンズの構成図を示すものである。第２図にお
いて１１はフォーカス部としての第１群、１２は変倍部
としての第２群、１３はコンベンセータ部としての第３
群、１４はリレ一部としての第４群である。An example of the above-mentioned conventional zoom lens for a video camera will be explained below with reference to the drawings (for example, Japanese Patent Application No. 85019/1983). Figure 2 shows a configuration diagram of a conventional zoom lens for a video camera. It is. In FIG. 2, 11 is a first group as a focus section, 12 is a second group as a variable magnification section, and 13 is a third group as a convencator section.
Group 14 is the fourth group as part of the relay.
以上のように構成されたビデオカメラ用ズームレンズに
ついて、以下その動作の説明をする。The operation of the video camera zoom lens configured as described above will be explained below.
まず、第１群１１は光軸上を移動することにより、物体
位置によるピント位置のズレを調整するフォーカス作用
を存する。第２群１２は倍率を変え、全系焦点距離を変
化させるために光軸上を移動する。第３群１３は第２群
１２の移動によって変動する像面を基準面から一定の位
置に保つコンベンセータ作用ををし、第２群１２と一定
の関係を保って光軸上を移動する。第４群１４は第１第
２．第３群によって形成される像面を所望の位置に移す
作用を有する。First, by moving on the optical axis, the first group 11 has a focusing effect that adjusts a shift in the focus position due to the object position. The second group 12 moves on the optical axis to change the magnification and change the focal length of the entire system. The third group 13 functions as a convencator to keep the image plane, which changes due to the movement of the second group 12, at a constant position from the reference plane, and moves on the optical axis while maintaining a constant relationship with the second group 12. The fourth group 14 includes first, second, . It has the function of moving the image plane formed by the third group to a desired position.
発明が解決しようとする課題
しかしながら上記のような構成のズームレンズでは、フ
ォーカス調整のためにレンズ外径が大きく、かつ重量の
大きい第１群１１を動かさねばならないという問題点を
有していた。また、第１群１１の移動により全系焦点距
離の変化、すなわち画角の変化が生じ、合焦過程で像の
変動が起るという問題点を有していた。さらに、ズーム
レンズ系をコンパクトにするために、第３群１３に負の
屈折力を持たせる必要があり、収差補正に対する第４群
１４の負担が非常に大きくなり、少ない構成枚数で高性
能を実現することが困難であるという問題点を有してい
た。Problems to be Solved by the Invention However, the zoom lens configured as described above has a problem in that the first lens group 11, which has a large outer diameter and is heavy, must be moved for focus adjustment. Furthermore, the movement of the first group 11 causes a change in the focal length of the entire system, that is, a change in the angle of view, resulting in a problem in that the image changes during the focusing process. Furthermore, in order to make the zoom lens system compact, it is necessary to provide the third group 13 with negative refractive power, and the burden on the fourth group 14 to correct aberrations becomes extremely large. The problem was that it was difficult to realize.
本発明は新しいレンズタイプを採用することにより、こ
れらの問題点を解決した非球面ズームレンズを提供する
ものである。The present invention provides an aspherical zoom lens that solves these problems by adopting a new lens type.
課題を解決するための手段
上記ｉ！題を解決するために、本発明の非球面ズームレ
ンズは、物体側より順に、正の屈折力を持ち結像作用を
有する第１群と負の屈折力を持ち光軸上を移動すること
により変倍作用を存する第２群と、正の屈折力を有する
第３群と、正の屈折力を有し、フォーカス調整を行なう
第４群から構成され、かつ各群が収差性能上好ましいレ
ンズタイプと球面形状および非球面形状からなるもので
ある。Means to solve the problem i! In order to solve this problem, the aspherical zoom lens of the present invention has, in order from the object side, a first group that has a positive refractive power and has an imaging function, and a first group that has a negative refractive power and moves on the optical axis. A lens type that is composed of a second group that has a variable power function, a third group that has a positive refractive power, and a fourth group that has a positive refractive power and that performs focus adjustment, and that each group is a preferable lens type in terms of aberration performance. It consists of a spherical shape and an aspherical shape.
さらに、下記の諸条件を満足する構成において、特に収
差性能が優れ、かつコンパクトな非球面ズームレンズが
少ない構成枚数で実現される。Furthermore, in a configuration that satisfies the following conditions, a compact aspherical zoom lens with particularly excellent aberration performance can be realized with a small number of components.
（］） ４．０＜ ｆＩ／ ｆ ｗ＜７．０（２）
１．０＜ ｌ ｆ２１／ｆ ｗ＜１．６（３）３．０
＜ｆ３／Ｊｗ＜６．０
（４）２．０＜ｆ４／１ｗ＜３．０
作用
本発明は上記した構成によって、従来の問題点を解決し
ている。すなわち像面に近い、従ってレンズ外径が小さ
い軽いレンズ群をフォーカス調整に用いている。また、
第３群に正の屈折力を持たせることにより、第４群の収
差補正の負担を軽減し、さらに第１．第３．第４群にそ
れぞれ少なくとも１面の非球面を持たせることで、少な
い構成枚数で高性能を実現している。さらに第３群の正
の屈折力を適切に選ぶことにより、第１．第２第３群の
合成屈折力を小さくし、第４群を移動による合焦過程で
生じる像の変動を実用上問題にならない程度まで小さく
している。(]) 4.0< fI/f w<7.0 (2)
1.0<l f21/f w<1.6(3)3.0
<f3/Jw<6.0 (4) 2.0<f4/1w<3.0 Effect The present invention solves the conventional problems with the above configuration. That is, a light lens group that is close to the image plane and has a small outer diameter is used for focus adjustment. Also,
By providing the third group with positive refractive power, the burden of aberration correction on the fourth group is reduced, and furthermore, the burden of aberration correction on the fourth group is reduced. Third. By providing each of the fourth groups with at least one aspherical surface, high performance is achieved with a small number of constituent elements. Furthermore, by appropriately selecting the positive refractive power of the third group, the first lens group. The composite refractive power of the second and third groups is made small, and the fluctuation of the image that occurs during the focusing process due to movement of the fourth group is made small to the extent that it does not pose a problem in practice.
実施例
以下本発明の一実施例について、図面を参照しながら説
明する。EXAMPLE An example of the present invention will be described below with reference to the drawings.
第１図は、本発明のズームレンズの一実施例の構成図を
示すものである。第１図において、ｌは第１群、２は第
２群、３は第３群、４は第４群、５は水晶フィルタや邊
像デバイスのフェイスプレート等に相当する等価的なガ
ラス板である。FIG. 1 shows a configuration diagram of an embodiment of a zoom lens according to the present invention. In Fig. 1, l is the first group, 2 is the second group, 3 is the third group, 4 is the fourth group, and 5 is an equivalent glass plate corresponding to a crystal filter or a face plate of a side image device. be.
ズームレンズをコンパクトに構成するには各群の屈折力
を強くすることが必要である。上記条件（１）１条件（
２）１条件（３）１条件（４）は各群の屈折力を規定す
る条件式であり、コンパクトさを実現する強い屈折力を
与えるが、各群のレンズタイプ、面形状等を最適に設定
することにより良好な収差性能を満足する範囲である。In order to make a zoom lens compact, it is necessary to increase the refractive power of each group. Above condition (1) 1 condition (
2) Condition 1 (3) and Condition 1 (4) are conditional expressions that define the refractive power of each group, and provide strong refractive power to achieve compactness, but it is important to optimize the lens type, surface shape, etc. of each group. This setting is within a range that satisfies good aberration performance.
また、第１群１は負の屈折力を持つメニスカスレンズと
正の屈折力をもつ両凸のレンズで構成され、２枚のレン
ズのいずれかの面に非球面を持ち、第３群の正の屈折力
の単レンズも１面以上非球面を有し、第４群の接合レン
ズも１面以上非球面を有する構成が最適である。The first group 1 is composed of a meniscus lens with negative refractive power and a biconvex lens with positive refractive power, and one of the two lenses has an aspherical surface, and the third group has an aspherical surface. Optimally, the single lens having a refractive power of 1 has at least one aspherical surface, and the cemented lens in the fourth group also has at least one aspherical surface.
次に各条件についてより詳しく説明する。Next, each condition will be explained in more detail.
条件（１）は第１群１の屈折力に関する条件である。Condition (1) is a condition regarding the refractive power of the first group 1.
下限を越えると第１群の１の屈折力が大きくなり過ぎる
ため、長焦点側の球面収差の補正が困難になる。上限を
越えるとレンズ長が大きくなり、コンパクトなズームレ
ンズが実現できない。If the lower limit is exceeded, the refractive power of 1 in the first group becomes too large, making it difficult to correct spherical aberration on the long focal point side. If the upper limit is exceeded, the lens length will increase, making it impossible to create a compact zoom lens.
条件（２）は第２群２の屈折力に関する条件である。Condition (2) is a condition regarding the refractive power of the second group 2.
下限から外れる時には、コンパクトにできるが、全系の
ペッツバール和が大きく負になり、硝材の選択のみでは
像面湾曲の補正ができない、上限を越えると収差補正は
容易であるが、変倍系が長くなり全系のコンパクト化が
達成できない。When the lower limit is exceeded, the system can be made compact, but the Petzval sum of the entire system becomes large and negative, and field curvature cannot be corrected just by selecting the glass material. This makes it impossible to achieve compactness of the entire system.
条件（３）は第３群３の屈折力に関する条件である。Condition (3) is a condition regarding the refractive power of the third group 3.
下限を越えると第３群３の屈折力が大きくなり過ぎるた
め、短焦点側の球面収差の補正が困難となる。上限を越
えると第１群、第２群、第３群の合成系が発散系となる
ためその後に位置する第４＃４のレンズ外径を小さくす
ることができない、また、条件（３）の上限・下限の範
囲を外れると、合焦過程での第４群４の移動による画角
の変化が大きくなるため、像の変動を小さ（することが
できな条件（４）は第４群４の屈折力に関する条件であ
る。If the lower limit is exceeded, the refractive power of the third group 3 becomes too large, making it difficult to correct spherical aberration on the short focus side. If the upper limit is exceeded, the composite system of the first, second, and third groups becomes a divergent system, so it is impossible to reduce the outer diameter of the fourth #4 lens located after it, and condition (3) is not satisfied. Outside of the upper and lower limits, the change in the angle of view due to the movement of the fourth group 4 during the focusing process becomes large. This is a condition regarding the refractive power of
下限から外れる時には、画面包括範囲が狭くなり、所望
の範囲を得るには第１群ｌのレンズ径を大きくする必要
があり、小型・軽量化が実現できない。When it deviates from the lower limit, the screen coverage range becomes narrower, and in order to obtain the desired range, it is necessary to increase the lens diameter of the first lens group 1, making it impossible to achieve a reduction in size and weight.
上限を越えると収差補正は容易であるが、近距離撮影時
での第４群４の移動量が大きくなり、全系のコンパクト
化が達成できないばかりでなく、近距離撮影時と遠距離
撮影時の軸外収差のアンバランスの補正が困難となる。If the upper limit is exceeded, it is easy to correct aberrations, but the amount of movement of the fourth group 4 becomes large when shooting at close range, which not only makes it impossible to make the entire system compact, but also when shooting at close and long distances. It becomes difficult to correct the imbalance of off-axis aberrations.
これらの条件を満す一実施例を以下に示す。表中ｒ１．
γ２．・・・は物体側から順に数えたレンズ各面の
曲率半径、ｄ、、ｄ２．・・・はレンズ面間の肉厚また
は空気間隔、ｎ、、ｎ２．・・・は各レンズのｄ線に対
する屈折率、シ１．シ２．・・・はｄ線に対するア、べ
数である。ｆは全系の焦点距離、Ｆ ／ Ｎ ｏばＦナ
ンバーである。また非球面係数ＣＣ，ＡＤ、ＡＥ、ＡＦ
、ＡＧは次式
％式％
で与えるものとする。但し、Ｈは光軸からの距離、Ｔは
曲率半径。An example that satisfies these conditions is shown below. r1 in the table.
γ2. ... is the radius of curvature of each lens surface counted in order from the object side, d, d2. ... is the wall thickness or air gap between lens surfaces, n, , n2. ... is the refractive index of each lens for the d-line; C2. ... are the a and b numbers for the d line. f is the focal length of the entire system, and F/No is the F number. Also, aspherical coefficients CC, AD, AE, AF
, AG shall be given by the following formula. However, H is the distance from the optical axis, and T is the radius of curvature.
（実施例■）
Ｊ 〜９．１７１〜５２．３３６
Ｆ／Ｎ ｏ 〜１．４５〜１．８３
ｒ 、 ＝ ２９．２３８ ｄ、 〜１．２ ｎｌ
〜１．８４６６６ ｖ 、 〜２３．９Ｔ２ｇ ２０
．８１９６２＝２．１７
ｒ３＝ ２３．４８７ ｄ、ｌ＝８．５０ ｎ２−１
．６４０５０ ｖ２＝６０．２γ、・−１２６，２３
０ｄ４・ （可変）ｒ ５＝ ７２．０１２ ｄ５＝０
．９Ｏｎ３．１．６４０５０ ｖ ３＝６０．２Ｔ、
・１３．２４２ ｄ、・５．３２４Ｔ ｙ −−１６，
３６４６ｔ □１．０Ｏｎｔ 〜１．６３８５４ １／
４ Ｊ５．５ｒ ８＝ １６．６１８ ｄ８＝２．５
０ １５〜１．８４６６６ ｖ ５−２３．９ｒ０．
７３．９２６ ｄ、＝ （可変）７ 、 ＝ ｏｏ
ｄｅ 〜２．ＯＯｒ 、、 ＝ ２０．７８３ ｄ
、、 〜３．９５ ｎ６〜１．７２９１６ ｖ ６
＝５４．８Ｔ４・５１．４７５ ｄ、・ （可変）ｒｌ
、−３４，４５９ｄｌ、＝０．９０ ０７ ＝１．８４
６６６ ｖ、 ＝２３．９ｒ 、ｌ＝ １２．４５９
ｄ、 ＝６．２９ ｎ８＝１．７７２５０ シ８
＝４９．６ｒ ｌ５＝−２４，５７５ｄ、 。(Example ■) J ~9.171~52.336 F/N o ~1.45~1.83 r, = 29.238 d, ~1.2 nl
~1.84666 v, ~23.9T2g 20
．． 81962=2.17 r3= 23.487 d, l=8.50 n2-1
．． 64050 v2=60.2γ, -126,23
0d4・ (variable) r 5= 72.012 d5=0
．． 9On3.1.64050v3=60.2T,
・13.242 d, ・5.324T y --16,
3646t □1.0Ont ~1.63854 1/
4 J5.5r 8= 16.618 d8=2.5
0 15-1.84666 v 5-23.9r0.
73.926 d, = (variable) 7, = oo
de ~2. OOr ,, = 20.783 d
,, ~3.95 n6 ~1.72916 v 6
=54.8T4・51.475 d,・(variable)rl
, -34,459dl, =0.90 07 =1.84
666 v, =23.9r, l=12.459
d, =6.29 n8=1.77250 C8
=49.6r l5=-24,575d, .
Ｔあ− ω ｄ、 ＝８．ＯＯ
γａ＝ ω
第４面、第１１面、第１３面は非球面であり、非球面係
数を以下に示す。Ta-ωd, =8. OO γa=ω The 4th surface, the 11th surface, and the 13th surface are aspheric surfaces, and the aspheric coefficients are shown below.
第４面 第１１面 第１３面
ＣＣ７，９３８１３−６，７４１１３Ｅ−１６，５９３
６６２−ＩＡＤ ９．８１９４０Ｅ−７＝１、３８５
５７Ｅ−５−３，５１２７２Ｅ−５Ａ Ｅ ２．５７
１７６Ｅ−９＝１、３９２２４Ｅ−７１，０９４９２Ｅ
−７Ａ Ｐ −４，０７６２８Ｅ−１１３，１８１６６
Ｅ−１０−３，９７９２０２−１０ＡＣ８，２２８４８
Ｅ−１４−２，９１９８０Ｅ−１２３，５７１９０Ｅ−
１２次に、ズーミングにより可変な空気間隔の一例とし
てレンズ先端γ１面より図って２ｍ位置の物点の場合の
空気間隔を示す。4th page 11th page 13th page CC7,93813-6,74113E-16,593
662-IAD 9.81940E-7=1, 385
57E-5-3, 51272E-5A E 2.57
176E-9=1, 39224E-71,09492E
-7A P -4,07628E-113,18166
E-10-3, 979202-10AC8, 22848
E-14-2, 91980E-123, 57190E-
12 Next, as an example of the air spacing that can be changed by zooming, the air spacing in the case of an object point at a position of 2 m as viewed from the γ1 plane at the tip of the lens is shown.
ｆ ｄ、 ｄ、 ｄユ広角 ９．＋７
１ １．０００ ２４．４３４ １０．４０８標準
２９．７０４ １７．５００ ？、９３４ ７．
４１３望遠 ５２．３３６ ２３．９００ １．５３
４ ９．１９４第３ｃｌ！Ｉ、第４図、第５図はおの
おの実施例１の広角端、標準、望遠端における収差性能
を示す。f d, d, d wide angle 9. +7
1 1.000 24.434 10.408 standard
29.704 17.500? , 934 7.
413 Telephoto 52.336 23.900 1.53
4 9.194 3rd cl! I, FIG. 4, and FIG. 5 show the aberration performance of Example 1 at the wide-angle end, standard, and telephoto end, respectively.
これらの図から、各実施例とも良好な光学性能を存して
いることが分る。From these figures, it can be seen that each example has good optical performance.
発明の効果
以上の説明から明らかなように、本発明のレンズ構成と
条件のもとで、Ｆナンバーが約１．４．ズーム比が約６
倍のコンパクトで、性能のよいビデオカメラ用ズームレ
ンズを８という掻めて少ない構成枚数で実現することが
できる。Effects of the Invention As is clear from the above explanation, under the lens configuration and conditions of the present invention, the F number is approximately 1.4. Zoom ratio is about 6
A zoom lens for a video camera that is twice as compact and has good performance can be realized with a much smaller number of elements (eight).
第１図は本発明の一実施例におけるズームレンズの構成
口、第２図は従来のズームレンズの構成図、第３図（ａ
）、 （ｂ）、 （Ｃ）、第４図（ａｌ、 （ｂ）、
（Ｃ）、第５図（ａ）、 （ｂ）、 （Ｃ）は本発明の
実施例１の諸収差図である。
球面収差の図において、実線はｄ線、−点鎖線はｇ線に
対する球面収差、非点収差の図において実線はサジタル
像面、点線はメリディオナル像面を示す。
ｌ・・・・・・第１群、２・・・・・・第２群、３・・
・・・・第３群、／−−１矛）畔
２−−−すど群
第
図
、１−−一水品フイ少グ
第
図
第
図
ｆ４．ｍ
（ｃＬ）
（ｂン
（Ｃ）
球面収差（Ｍノ
オ斎収ｌ＋１１１ｎ）
止油濯ｉ（勾
第
図
Ｊ ＝ ｚ？、 ｙｃ４
（αう
（ｂ）
（Ｃ）
ｏ、ｏ ０．Ｚ
−ａ、Ｚ Ｏθ
ｚ
Ｓθ
０、Ｏ
δＯ
像面収差（富粕
席点項差俤ｍ）
壬曲収り’ｉ ／２４ノ
第
図
ｆ＝ｓ乙３３乙
ｔα）
（ｂ）
球面収差（ｍｗ＋ン
ｉｔ給収差（凰削
王曲取差（％）FIG. 1 shows the configuration of a zoom lens according to an embodiment of the present invention, FIG. 2 shows the configuration of a conventional zoom lens, and FIG.
), (b), (C), Figure 4 (al, (b),
(C), FIGS. 5(a), (b), and (C) are various aberration diagrams of Example 1 of the present invention. In the diagram of spherical aberration, the solid line shows the spherical aberration for the d-line, the dashed-dotted line shows the spherical aberration for the g-line, and in the diagram of astigmatism, the solid line shows the sagittal image plane, and the dotted line shows the meridional image plane. l...1st group, 2...2nd group, 3...
... 3rd group, /--1 sword) 2--Sudo group diagram, 1--Ichimizuhina figure small figure figure f4. m (cL) (bn (C) Spherical aberration (M nosai + 111n) Oil stop i (gradient diagram J = z?, yc4 (α) (b) (C) o, o 0.Z -a , Z Oθ z Sθ 0, O δO Field aberration (Tomikasu seat point term difference 俤m) Mikujuri'i /24ノ 〇 f = s Otsu 33 Otsu tα) (b) Spherical aberration (mw + n it Salary difference (Difference between salary and income (%)
Claims (1)
の屈折力を持ち光軸上を移動することにより変倍作用を
有する第２群と、正の屈折力を持ち集光作用を有する第
３群と、上記第２群の移動、および物体の移動によって
変動する像面を基準面から一定の位置に保つように光軸
上を移動する第４群とからなるズームレンズであって、
上記第３群と上記第４群が比較的大きな空気間隔を有す
ることを特徴とする非球面ズームレンズ。 （２）第１群は物体側により順に負の屈折力の単レンズ
、つづいて正の屈折力の単レンズで構成され、上記第２
群は負の屈折力のメニスカスレンズおよび接合レンズで
構成され、上記第３群は正の屈折力の単レンズで構成さ
れ、上記第４群は負の屈折力の単レンズ、つづいて正の
屈折力の単レンズで構成されることを特徴とする請求項
（１）記載の非球面ズームレンズ。 （３）第４群が負の屈折力を有する物体側に凸面の向い
たメニスカスレンズと、両凸の単レンズの接合レンズで
あることを特徴とする請求項（１）記載の非球面ズーム
レンズ。 （４）第１群、上記第３群、上記第４群にそれぞれ少な
くとも１面以上の非球面を有することを特徴とした請求
項（２）記載の非球面ズームレンズ。 （５）下記の諸条件を満足することを特徴とする請求項
（２）記載の非球面ズームレンズ。 （１）４．０＜ｆ＿ｉ／ｆ＿ｗ＜７．０ （２）１．０＜｜ｆ＿２｜／ｆ＿ｗ＜１．６（３）３．
０＜ｆ＿３／ｆ＿ｗ＜６．０ （４）２．０＜ｆ＿４／ｆ＿ｗ＜３．０ ただしｆ＿ｗは広角端の全系焦点距離、ｆ＿ｉ（ｉ＝１
、２、３、４）は第ｉ群の焦点距離を示す。[Claims] (1) In order from the object side, a first group having a positive refractive power, a second group having a negative refractive power and having a variable magnification effect by moving on the optical axis, and a positive refractive power. a third lens group that has a refractive power of A zoom lens consisting of a group of
An aspherical zoom lens characterized in that the third group and the fourth group have a relatively large air gap. (2) The first group consists of a single lens with negative refractive power, followed by a single lens with positive refractive power, in order from the object side, and
The group is composed of a meniscus lens with negative refractive power and a cemented lens, the third group is composed of a single lens with positive refractive power, and the fourth group is composed of a single lens with negative refractive power, followed by a single lens with positive refractive power. 2. The aspherical zoom lens according to claim 1, wherein the aspherical zoom lens is comprised of a single lens with a large aperture. (3) The aspherical zoom lens according to claim (1), wherein the fourth group is a cemented lens consisting of a meniscus lens having negative refractive power and a convex surface facing the object side, and a biconvex single lens. . (4) The aspherical zoom lens according to claim 2, wherein each of the first group, the third group, and the fourth group has at least one aspherical surface. (5) The aspherical zoom lens according to claim (2), which satisfies the following conditions. (1) 4.0<f_i/f_w<7.0 (2) 1.0<|f_2|/f_w<1.6 (3) 3.
0<f_3/f_w<6.0 (4) 2.0<f_4/f_w<3.0 where f_w is the focal length of the entire system at the wide-angle end, f_i (i=1
, 2, 3, 4) indicate the focal length of the i-th group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63189024A JPH0239011A (en) | 1988-07-28 | 1988-07-28 | Aspherical zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63189024A JPH0239011A (en) | 1988-07-28 | 1988-07-28 | Aspherical zoom lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0239011A true JPH0239011A (en) | 1990-02-08 |
Family
ID=16234025
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63189024A Pending JPH0239011A (en) | 1988-07-28 | 1988-07-28 | Aspherical zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0239011A (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0478808A (en) * | 1990-07-20 | 1992-03-12 | Canon Inc | Rear focus type zoom lens |
| JPH0478807A (en) * | 1990-07-20 | 1992-03-12 | Canon Inc | Rear focus type zoom lens |
| US5155630A (en) * | 1989-12-08 | 1992-10-13 | Minolta Camera Co., Ltd. | Zoom lens system |
| US5231540A (en) * | 1991-07-16 | 1993-07-27 | Olympus Optical Co., Ltd. | Compact zoom lens system |
| US5268793A (en) * | 1992-01-29 | 1993-12-07 | Minolta Camera Kabushiki Kaisha | Zoom lens system |
| US5321552A (en) * | 1990-02-08 | 1994-06-14 | Canon Kabushiki Kaisha | Rear-focus-type zoom lens equipped with index-distribution-type lens |
| US5359457A (en) * | 1991-10-03 | 1994-10-25 | Minolta Camera Co., Ltd. | Wide-angle zoom lens system |
| US5424869A (en) * | 1992-07-22 | 1995-06-13 | Sony Corporation | Zoom lens |
| US5430576A (en) * | 1992-06-30 | 1995-07-04 | Canon Kabushiki Kaisha | Rear focus type zoom lens |
| US5568197A (en) * | 1991-04-08 | 1996-10-22 | Canon Kabushiki Kaisha | Camera apparatus having an optical low-pass filter |
| US5748238A (en) * | 1992-03-12 | 1998-05-05 | Hitachi, Ltd. | Video camera |
| US6049431A (en) * | 1996-01-10 | 2000-04-11 | Canon Kabushiki Kaisha | Zoom lens |
| JP2000131610A (en) * | 1998-10-28 | 2000-05-12 | Sony Corp | Zoom lens |
| KR100280324B1 (en) * | 1997-12-26 | 2001-03-02 | 이중구 | Zoom lens |
| JP2008122879A (en) * | 2006-11-15 | 2008-05-29 | Olympus Imaging Corp | Zoom lens and electronic imaging apparatus using the same |
-
1988
- 1988-07-28 JP JP63189024A patent/JPH0239011A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5155630A (en) * | 1989-12-08 | 1992-10-13 | Minolta Camera Co., Ltd. | Zoom lens system |
| US5321552A (en) * | 1990-02-08 | 1994-06-14 | Canon Kabushiki Kaisha | Rear-focus-type zoom lens equipped with index-distribution-type lens |
| JPH0478807A (en) * | 1990-07-20 | 1992-03-12 | Canon Inc | Rear focus type zoom lens |
| JPH0478808A (en) * | 1990-07-20 | 1992-03-12 | Canon Inc | Rear focus type zoom lens |
| US5568197A (en) * | 1991-04-08 | 1996-10-22 | Canon Kabushiki Kaisha | Camera apparatus having an optical low-pass filter |
| US5231540A (en) * | 1991-07-16 | 1993-07-27 | Olympus Optical Co., Ltd. | Compact zoom lens system |
| US5359457A (en) * | 1991-10-03 | 1994-10-25 | Minolta Camera Co., Ltd. | Wide-angle zoom lens system |
| US5268793A (en) * | 1992-01-29 | 1993-12-07 | Minolta Camera Kabushiki Kaisha | Zoom lens system |
| US5748238A (en) * | 1992-03-12 | 1998-05-05 | Hitachi, Ltd. | Video camera |
| US5430576A (en) * | 1992-06-30 | 1995-07-04 | Canon Kabushiki Kaisha | Rear focus type zoom lens |
| US5424869A (en) * | 1992-07-22 | 1995-06-13 | Sony Corporation | Zoom lens |
| US6049431A (en) * | 1996-01-10 | 2000-04-11 | Canon Kabushiki Kaisha | Zoom lens |
| KR100280324B1 (en) * | 1997-12-26 | 2001-03-02 | 이중구 | Zoom lens |
| JP2000131610A (en) * | 1998-10-28 | 2000-05-12 | Sony Corp | Zoom lens |
| JP2008122879A (en) * | 2006-11-15 | 2008-05-29 | Olympus Imaging Corp | Zoom lens and electronic imaging apparatus using the same |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3584107B2 (en) | Zoom lens | |
| JPH0572474A (en) | Aspherical zoom lens and video camera using the same | |
| JP4695744B2 (en) | Zoom lens and projection apparatus using the same | |
| JPH0239011A (en) | Aspherical zoom lens | |
| JPH1184242A (en) | Zoom lens | |
| JPH04253017A (en) | Zoom lens | |
| JP2862272B2 (en) | Wide-angle zoom lens | |
| JP3412908B2 (en) | Zoom lens | |
| JPH05297275A (en) | Aspherical zoom lens and video camera using same | |
| JP3184581B2 (en) | Zoom lens | |
| JP3085823B2 (en) | Aspherical zoom lens and video camera using it | |
| JPH0814654B2 (en) | Small zoom lens | |
| JPH08179196A (en) | Retrofocus type lens | |
| JP2004061681A (en) | Zoom lens and optical equipment with same | |
| JPH0560971A (en) | Rear focus zoom lens | |
| JPH0727979A (en) | Zoom lens | |
| JPH0483214A (en) | Variable power lens | |
| JPH08110470A (en) | Wide angle zoom lens | |
| JP3706827B2 (en) | Zoom lens and optical apparatus having the same | |
| JP3054185B2 (en) | Zoom lens | |
| JP2560413B2 (en) | Small zoom lens | |
| JP2502754B2 (en) | Aspherical zoom lens | |
| JP2003043358A (en) | Zoom lens | |
| JP2932603B2 (en) | Zoom lens | |
| JPH0253017A (en) | Aspherical zoom lens |